CN119041471A - Large-volume raft foundation concrete curing temperature control structure and construction method thereof - Google Patents
Large-volume raft foundation concrete curing temperature control structure and construction method thereof Download PDFInfo
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- CN119041471A CN119041471A CN202411185380.0A CN202411185380A CN119041471A CN 119041471 A CN119041471 A CN 119041471A CN 202411185380 A CN202411185380 A CN 202411185380A CN 119041471 A CN119041471 A CN 119041471A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0075—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability making use of a decrease in temperature
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
- E02D27/013—Shuttering specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
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Abstract
The invention provides a concrete curing temperature control structure of a large-volume raft foundation and a construction method thereof, the concrete curing temperature control structure comprises a raft, a template surrounding the raft is arranged outside the raft, the top of the template is higher than the top surface of the raft to form an insulating layer, coiled cooling water pipes are arranged on steel bar meshes inside the raft, water inlet and outlet ends of the cooling water pipes extend to the outside of the raft through the template, wherein the water inlet ends are communicated with a circulating system, and water outlet ends penetrate in and out from the template higher than the top surface of the raft. The cooling water with proper temperature can circulate in the cooling water pipe through the circulating system, so that heat inside the raft is absorbed, and flows back to the circulating system for circulation after passing through the heat preservation layer, and therefore the effect of low carbon, energy conservation and environmental protection is achieved when the heat inside the raft is dissipated, the stability of the surface temperature of the raft is guaranteed by utilizing the heat, the internal and external temperature differences are effectively avoided, the heat inside the raft is utilized, and the heat utilization rate is improved.
Description
Technical Field
The invention relates to the field of raft curing, in particular to a concrete curing temperature control structure of a large-volume raft foundation and a construction method thereof.
Background
The large-volume concrete engineering faces a series of special challenges and technical requirements due to the large structure thickness and the huge volume. Besides meeting the strength requirement specified by design, the concrete hydration heat is controlled, various types of cracks are prevented from being generated, and the structure is ensured to have good impermeability and no shrinkage, so that the concrete is an important point and a difficult point in the construction process.
This is particularly true in large volumes of concrete where a large amount of heat is released during hydration of the concrete. After pouring is completed, the internal temperature rises, and the surface is easy to dissipate heat, so that the temperature difference between the inside and the outside is generated. Such a temperature difference may cause compressive stress to occur inside and tensile stress to occur on the surface. The early tensile strength of freshly poured concrete is low, and cracks can be generated on the surface of the concrete when the surface tensile stress exceeds the ultimate tensile strength. These cracks may further develop into penetrating cracks under the change of the outside air temperature, resulting in cracking of concrete, causing water leakage problem of the base plate, and possibly causing structural damage to the base plate, leaving potential safety hazard. Therefore, a concrete curing temperature control structure of a large-volume raft foundation and a construction method thereof are provided to solve the problems.
Disclosure of Invention
The invention mainly aims to provide a concrete curing temperature control structure of a large-volume raft foundation and a construction method thereof, which solve the problem of large temperature difference between the inside and the outside of the concrete of the large-volume raft foundation.
The technical scheme includes that the concrete curing temperature control structure comprises a raft, a template surrounding the raft is arranged outside the raft, the top of the template is higher than the top surface of the raft to form a heat insulation layer, coiled cooling water pipes are arranged on reinforcing steel meshes in the raft, water inlet ends and water outlet ends of the cooling water pipes penetrate through the template to extend to the outside of the raft, wherein the water inlet ends are communicated with a circulation system, the water outlet ends penetrate through the template higher than the top surface of the raft, the water inlet ends penetrate through the heat insulation layer and then are connected with the circulation system to form a circulation cooling loop, and a heat insulation cover for sealing the top of the heat insulation layer is arranged on the top cover of the template.
In the preferred scheme, temperature sensors are uniformly distributed in the raft and the heat insulation layer.
In the preferred scheme, be provided with the drain valve on being located the condenser tube in the heat preservation, can discharge the circulating water in the condenser tube to the heat preservation in, the side of template still is provided with one end and heat preservation intercommunication, and the recovery system that the other end is connected with circulation system.
In the preferred scheme, the cooling water pipe comprises a water inlet pipe penetrating through the template and inserted into the raft, the insertion end of the water inlet pipe is communicated with two cooling pipes through a first tee joint, the two cooling pipes are coiled and distributed on the reinforcing steel mesh, the water outlet end is communicated with two branch pipes through a second tee joint, the branch pipes penetrate out of the template and penetrate into the heat insulation layer, a water discharge valve is arranged on the pipe section of the heat insulation layer, the end parts of the four branch pipes are communicated with a concentrated pipe, and the middle part of the concentrated pipe is communicated with a circulating pipe connected with a circulating system through the template;
The circulating system comprises a water collecting pit, a temperature rising device and a circulating water pump which are sequentially connected through pipelines, wherein the output end of the circulating water pump is connected with a water inlet pipe, and the circulating pipe is connected with the water collecting pit;
the recovery system comprises a drain pipe which penetrates through the template and is communicated with the heat preservation layer, the other end of the drain pipe is connected with a water inlet end of the filter, and a water outlet end of the filter is connected with the temperature rising device through a recovery pipe.
In the preferred scheme, the heat preservation cover is a mineral wool quilt, the templates are steel templates, track assemblies are arranged at the tops of the two opposite templates, and an automatic retraction mechanism for retracting the heat preservation cover is arranged on the two track assemblies;
The automatic winding and unwinding mechanism comprises two moving mechanisms which are respectively and movably arranged on the track assembly and a winding shaft which is in transmission connection with the two moving mechanisms;
a hooking plate is fixedly arranged on the outer side of the top of the template at the end part;
one end of the heat preservation cover is fixed on the winding shaft, and the other end of the heat preservation cover is connected with a hooking strip which can be hooked with the hooking plate.
In a preferred scheme, the track assembly comprises a T-shaped sliding rail and a rack which are arranged in parallel;
The moving mechanism comprises a moving seat, the bottom of the moving seat is provided with a sliding seat which is in sliding connection with a T-shaped sliding rail, the middle of the moving seat is rotatably penetrated by a bearing and provided with a transmission shaft, the outside of the transmission shaft is provided with a traveling gear meshed with a rack, and the two ends of the rolling shaft are respectively connected with the end parts of the transmission shafts of the two moving mechanisms;
One of them moving mechanism is last to be provided with actuating mechanism, and actuating mechanism is including setting up the backup pad on moving seat top, is provided with drive arrangement in the backup pad, and drive arrangement's output is installed drive sprocket, and the tip of transmission shaft is provided with the driven sprocket corresponding with drive sprocket, and drive sprocket and driven sprocket's outside cover are equipped with the chain.
In the preferred scheme, the automatic retraction mechanism further comprises a flattening component arranged between the two moving mechanisms, the flattening component comprises mounting seats arranged at opposite ends of the two moving seats and a flattening roller arranged between the two mounting seats, and the bottom of the flattening roller is level with the top end of the template;
The automatic winding and unwinding mechanism further comprises a winding and compacting assembly which is arranged between the two moving mechanisms and is attached to the heat-preserving cover on the winding shaft, the winding and compacting assembly comprises rotating bearings which are respectively arranged on the opposite sides of the two moving seats, rotating parts are rotatably connected to the rotating bearings through rotating shafts, compacting rollers are rotatably arranged between the two rotating parts, and reset torsion springs which are used for keeping the attaching relation of the compacting rollers and the heat-preserving cover are sleeved on the rotating shafts.
In the preferred scheme, the cooling water pipe is fixed on the steel bar net sheet in the raft through the supporting mechanism;
the supporting mechanism comprises a telescopic rod, a lifting cylinder is sleeved outside the telescopic rod in a sliding mode, an inclined supporting rod is hinged to the outer portion of the lifting cylinder, clamping mechanisms are connected to the bottom of the inclined supporting rod and two ends of the telescopic rod through universal joints, and locking bolts penetrate through upper threads of the lifting cylinder.
In the preferred scheme, the telescopic rod is a threaded telescopic rod;
the clamping mechanism comprises a vertical rod connected with one end of the universal joint, a connecting seat is arranged at the top of the vertical rod, clamping components are arranged at two ends of the connecting seat, and a control component for controlling the clamping components to clamp is arranged outside the vertical rod;
The clamping assembly comprises two clamps, the middle parts of the two clamps are hinged in a crossed manner through a connecting shaft, the bottom ends of the two clamps are hinged with transmission rods, the bottom ends of the two transmission rods are hinged with the control seat, and the end part of the connecting shaft is connected with the connecting seat;
the outside of the vertical rod is provided with a thread wire and two lifting grooves on opposite sides;
The control assembly comprises a lifting ring movably sleeved outside the vertical rod, a limiting block which is in sliding connection with the lifting groove is arranged on the inner wall surface of the lifting ring, two extension plates on the outer wall surface of the lifting ring are fixedly connected with the bottoms of the corresponding control seats, an internal thread sleeve is sleeved on the external thread of the vertical rod, and the top of the internal thread sleeve is rotatably connected with the bottom of the lifting ring;
the bottom of the lifting ring is provided with a connecting ring with a T-shaped section, the top of the internal thread sleeve is provided with a rotary ring groove matched with the connecting ring, and the connecting ring is arranged in the rotary ring groove in a sliding way;
the top of connecting seat and the clamping end of clamp all are provided with the arc groove with reinforcing bar and condenser tube looks adaptation, and the inslot is provided with the sheet rubber.
The method comprises the following steps:
s1, splicing reinforcement meshes of the raft, arranging coiled cooling water pipes in the reinforcement meshes, and arranging a temperature sensor;
S2, installing a template, wherein the top end of the template is higher than the top surface of the formed raft, an insulation layer can be formed, the water inlet and outlet ends of the cooling water pipes penetrate through the template and extend to the outside of the template, and then, the concrete pouring work of the raft is completed;
S3, connecting a water inlet end of the cooling water pipe with the circulating system, penetrating a water outlet end of the cooling water pipe into and out of a template higher than the top surface of the raft, penetrating the heat insulation layer and then connecting the cooling water pipe with the circulating system to form a circulating cooling loop, arranging a temperature sensor in the heat insulation layer, and arranging a drain valve on a pipe section of the cooling water pipe, which is positioned on the heat insulation layer;
S4, arranging a recovery system with one end communicated with the heat preservation layer and the other end connected with the circulation system on the template, and arranging a filter in the recovery system;
S5, covering the top of the template with a heat-insulating cover, and sealing the top of the heat-insulating layer;
s6, starting a circulating system, and forming a circulating temperature control loop inside and outside the raft;
and S7, monitoring the temperatures in the raft and the heat insulation layer through temperature sensors, and when the temperature difference between the raft and the heat insulation layer is overlarge, opening a drain valve to enable water subjected to heat conversion in the raft to be discharged into the heat insulation layer, and simultaneously opening a recovery system to form a further balance circulation temperature control loop.
The invention provides a concrete curing temperature control structure with a large volume of raft foundation and a construction method thereof, which can enable cooling water with proper temperature to circulate in a cooling water pipe through a circulating system, thereby absorbing heat in the raft, and after passing through a heat preservation layer, the cooling water flows back to the circulating system for circulation, thereby realizing the purposes of guaranteeing the stability of the surface temperature of the raft by utilizing the heat while radiating the heat in the raft, effectively avoiding large temperature difference between the inside and the outside, simultaneously utilizing the heat in the raft, improving the heat utilization rate, realizing the effects of low carbon, energy conservation and environmental protection, simultaneously enabling the heat preservation layer to form a relatively sealed environment through a heat preservation cover arranged at the top of the heat preservation layer, avoiding the rapid change of the surface temperature of the raft, leading to large temperature difference between the inside and the outside, and secondly, when the temperature change of the surface temperature of the raft is obviously reduced, discharging the circulating water after absorbing the heat in the cooling water to the heat preservation layer, stabilizing the temperature by directly contacting the surface, and recycling the water in the heat preservation layer by utilizing a recycling system.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a half-section view of a raft according to the present invention;
FIG. 2 is a top view of the raft of the present invention;
FIG. 3 is a diagram showing the structure of the connection between the heat preservation cover and the raft board;
FIG. 4 is a diagram of the connection structure of the template and raft of the invention;
FIG. 5 is a diagram showing the connection structure of the heat preservation cover and the automatic folding and unfolding mechanism;
FIG. 6 is a block diagram of the automatic retracting mechanism of the present invention;
FIG. 7 is an enlarged view of the structure A of FIG. 6 in accordance with the present invention;
FIG. 8 is a view of the structure of FIG. 6 from another perspective in accordance with the present invention;
FIG. 9 is a block diagram of the support mechanism of the present invention;
FIG. 10 is an exploded view of the clamping mechanism of the present invention;
FIG. 11 is a top view of the lift ring of the present invention;
In the drawing, a raft plate 1, a cooling water pipe 2, a water inlet pipe 201, a first tee joint 202, a cooling pipe 203, a second tee joint 204, a branch pipe 205, a drain valve 206, a concentration pipe 207, a circulation pipe 208, a drain pipe 209, a filter 210, a circulation system 3, a water collecting pit 301, a temperature raising device 302, a circulation water pump 303, a template 4, a hanging plate 401, a heat preservation cover 5, a hanging bar 501, a track assembly 6, a rack 601, a T-shaped slide rail 602, an automatic retraction mechanism 7, a moving mechanism 71, a moving seat 710, a sliding seat 711, a transmission shaft 712, a traveling gear 713, a support plate 714, a driving device 715, a transmission sprocket 716, a driven sprocket 717, a chain 718, a winding shaft 72, a flattening assembly 73, a mounting seat 730, a flattening roller 731, a winding compacting assembly 74, a rotary bearing 740, a rotary member 741, a compacting roller 742, a support mechanism 8, a telescopic rod 81, a lifting cylinder 82, a diagonal brace 83, a universal joint 84, a clamping mechanism 85, 850, a lifting groove 8500, a connecting seat 8520, a connecting shaft 8521, a transmission rod 8522, a control seat 8523, a vertical rod 853, a control seat 853, a lifting ring 8531, a control 8532, and an extension ring 8535.
Detailed Description
Example 1
As shown in fig. 1-4, a concrete curing temperature control structure for a large-volume raft foundation comprises a raft 1, wherein a template 4 surrounding the raft 1 is arranged outside the raft 1, the top of the template 4 is higher than the top surface of the raft 1 to form an insulating layer, coiled cooling water pipes 2 are arranged on steel bar meshes inside the raft 1, water inlet and outlet ends of the cooling water pipes 2 extend to the outside through the template 4, a circulating system 3 is communicated with the water inlet ends, water outlet ends penetrate through the template 4 higher than the top surface of the raft 1, a circulating cooling loop is formed by connecting the template 4 with the circulating system 3 after penetrating through the insulating layer, and an insulating cover 5 for sealing the top of the insulating layer is arranged on the top cover of the template 4.
During maintenance, cooling water with proper temperature flows through the cooling water pipe 2 through the circulating system 3, so that heat inside the raft 1 is absorbed, and flows back to the circulating system 3 for circulation after passing through the heat preservation, and further, the stability of the surface temperature of the raft 1 is guaranteed by utilizing the heat while the heat is dissipated inside the raft 1, the temperature difference between the inside and the outside is effectively avoided, the heat inside the raft 1 is utilized, the heat utilization rate is improved, the effect of low carbon, energy conservation and environmental protection is realized, and meanwhile, the heat preservation cover 5 is arranged through the cover at the top of the heat preservation, so that the heat preservation forms a relatively sealed environment, and the rapid change of the surface temperature of the raft 1 is avoided.
In the preferred scheme, temperature sensors are uniformly distributed in the raft 1 and the heat preservation layer and used for monitoring the temperature inside the raft 1 and the temperature on the surface of the raft in real time.
The temperature sensor inside the raft 1 needs to be embedded therein before casting, and the temperature sensor is a commercially available product, and thus will not be described in detail here.
In the preferred scheme, install drain valve 206 on being located condenser tube 2 in the heat preservation to can be in the heat preservation is discharged to condenser tube 2 after absorbing the circulating water after the heat in the surface temperature variation decline is obvious in raft 1, through direct and the contact stable temperature on surface, template 4's side still is provided with one end and heat preservation intercommunication, the recovery system that the other end is connected with circulation system 3, thereby can carry out the cyclic utilization once more with the water in the heat preservation through recovery system, can effectively avoid water in the heat preservation to receive external environment influence through heat preservation lid 5 simultaneously, prevent dust impurity to get into wherein, influence circulation system.
In the preferred scheme, condenser tube 2 is including running through template 4 and inserting the inlet tube 201 in raft 1, and the inserted end of inlet tube 201 has two cooling tubes 203 through first tee bend 202 intercommunication, and two cooling tubes 203 all coil and lay on the reinforcing bar net piece, and the play water end all has two to be in charge of 205 through second tee bend 204 intercommunication, is in charge of 205 and wears out from template 4 and penetrate the heat preservation, is provided with drain valve 206 on its being located the pipe section of heat preservation, and the tip intercommunication of four is in charge of 205 has concentrated pipe 207, and the middle part intercommunication of concentrated pipe 207 has the circulating pipe 208 that runs through template 4 and is connected with circulation system 3.
Through the cooling water pipe 2 system with multiple pipelines, the efficiency of discharging circulating water into the heat preservation layer can be effectively improved, and meanwhile, the heat dissipation efficiency of the inside of the raft board 1 can be effectively improved.
The circulation system 3 comprises a water collection pit 301, a temperature rising device 302 and a circulating water pump 303 which are sequentially connected through pipelines, wherein the output end of the circulating water pump 303 is connected with a water inlet pipe 201, and a circulating pipe 208 is connected with the water collection pit 301, so that an effective circulation system is formed.
The recovery system comprises a drain pipe 209 which penetrates through the template 4 and is communicated with the heat preservation layer, the other end of the drain pipe 209 is connected with the water inlet end of the filter 210, the water outlet end of the filter 210 is connected with the temperature rising device 302 through the recovery pipe 211, the drain pipe 209 is positioned at the bottommost part of the heat preservation layer, and water is conveniently pumped out of the drain pipe and filtered by the filter 210 and enters the temperature rising device 302 for circulation.
The filter 210 is a commercially available product, and thus, will not be described in detail herein.
In a preferred embodiment, the insulating cover 5 is a mineral wool quilt, and the covering thickness is obtained by the following formula:
Wherein, delta is the thickness (m) of the heat preservation layer on the surface of the concrete;
λ0-thermal conductivity of concrete [ W/(m.k) ];
λi-thermal conductivity of the thermal insulation material [ W/(m.k) ];
ts—concrete casting surface temperature (°c);
Tq-atmospheric level at maximum temperature of concrete (3 d-5 d after casting)
Average temperature (°c);
tmax—maximum temperature in the concrete casting (°c);
h-the actual thickness (m) of the concrete structure;
Kb-correction value of heat transfer coefficient.
Example 2
3-8, The templates 4 are steel templates, the tops of the two opposite templates 4 are respectively provided with a track assembly 6, and the two track assemblies 6 are provided with an automatic retraction mechanism 7 for retracting the heat preservation cover 5, and the automatic retraction mechanism 7 can be used for automatically retracting the heat preservation cover 5, so that the heat preservation cover can be automatically retracted when the surface temperature is too high.
The automatic retraction mechanism 7 comprises two moving mechanisms 71 which are respectively and movably arranged on the track assemblies 6, and a winding shaft 72 which is in transmission connection with the two moving mechanisms 71, wherein the winding shaft 72 can retract and release the heat preservation cover 5 along with the travelling of the two moving mechanisms 71 on the two track assemblies 6.
A hooking plate 401 is fixedly arranged on the outer side of the top of the template 4 at the end part.
One end of the heat-insulating cover 5 is fixed on the winding shaft 72, and the other end is connected with a hooking bar 501 which can be hooked with the hooking plate 401.
By the design, the heat preservation cover 5 can be hung on the hanging plate 401 through the hanging bar 501, then the heat preservation cover 5 can be folded and unfolded through the automatic folding and unfolding mechanism 7 walking on the track assembly 6, and meanwhile, the steel molding plate can meet the walking strength of the automatic folding and unfolding mechanism 7.
In a preferred embodiment, the track assembly 6 includes a T-shaped slide 602 and a rack 601 arranged in parallel, and the T-shaped slide 602 and the rack 601 are fixedly mounted on the form 4.
The moving mechanism 71 comprises a moving seat 710, a sliding seat 711 which is in sliding connection with the T-shaped sliding rail 602 is fixedly arranged on the moving seat 710, a transmission shaft 712 is rotatably arranged in the middle of the moving seat through a bearing in a penetrating way, a traveling gear 713 which is meshed with the rack 601 is fixedly arranged outside the transmission shaft 712, and two ends of the winding shaft 72 are respectively connected with the end parts of the transmission shafts 712 of the two moving mechanisms 71.
One of the moving mechanisms 71 is fixedly provided with a driving mechanism, the driving mechanism comprises a supporting plate 714 fixedly arranged at the top end of the moving seat 710, a driving device 715 is arranged on the supporting plate 714, a driving sprocket 716 is arranged at the output end of the driving device 715, a driven sprocket 717 corresponding to the driving sprocket 716 is arranged at the end part of the driving shaft 712, and a chain 718 is sleeved outside the driving sprocket 716 and the driven sprocket 717.
When in use, the transmission shaft 712 drives the traveling gear 713 to travel on the rack 601 through the driving of the driving mechanism and the transmission relation among the transmission chain wheel 716, the driven chain wheel 717 and the chain 718, and simultaneously, the transmission shaft 712 can rotate with the same step in the traveling process, thereby realizing the retraction and the extension of the heat preservation cover 5.
The driving device 715 is composed of a driving motor and a speed reducer
In a preferred embodiment, the automatic retraction mechanism 7 further comprises a flattening component 73 arranged between the two moving mechanisms 71, the flattening component 73 comprises a mounting seat 730 fixedly arranged at opposite ends of the two moving seats 710 and a flattening roller 731 arranged between the two mounting seats 730, and the bottom of the flattening roller 731 is flush with the top end of the template 4, so that when the thermal insulation cover 5 is unfolded, as shown in fig. 3 and 5, the unfolded thermal insulation cover 5 can form a plane through the flattening roller 731, the sealing effect on the thermal insulation layer is improved, and in the embodiment, the flattening roller 731 is rotatably arranged between the two mounting seats 730, and friction can be effectively reduced through rotation of the flattening roller 731.
The automatic retraction mechanism 7 further comprises a retraction compacting assembly 74 which is arranged between the two moving mechanisms 71 and is attached to the thermal insulation cover 5 on the retraction shaft 72, the retraction compacting assembly 74 comprises rotary bearings 740 which are respectively arranged on opposite sides of the two moving seats 710, the rotary bearings 740 are rotatably connected with rotary members 741 through rotating shafts, a compaction roller 742 is rotatably arranged between the two rotary members 741, a reset torsion spring which is used for keeping the attachment relation between the compaction roller 742 and the thermal insulation cover 5 is sleeved on the rotating shafts, the reset torsion spring is not described in detail in the figure, and the specific installation mode is a common installation mode of the reset torsion spring, so that the thermal insulation cover 5 can be compacted when being retracted through the attachment relation between the compaction roller 742 and the thermal insulation cover 5, and the situation of unsmooth retraction is avoided.
Example 3
In combination with embodiment 1, at present, the cooling water pipe 2 is mainly bound with the vertical steel bars of the steel bar meshes through iron wires, so that the cooling water pipe 2 can be located in the middle of the multi-layer steel bar meshes, however, when concrete pouring is performed, the cooling water pipe 2 falls down in the vertical direction, so that unnecessary displacement is generated, and in order to improve the installation stability of the cooling water pipe 2, the cooling water pipe 2 is further fixed on the steel bar meshes below the cooling water pipe 2 in the raft 1 through a supporting mechanism 8, as shown in fig. 9-11.
In the preferred scheme, supporting mechanism 8 includes telescopic link 81, telescopic link 81 adjustable supporting height satisfies cooling water pipe 2 and the interval requirement of its below reinforcing bar net piece, the outside slip cover of telescopic link 81 is equipped with lift section of thick bamboo 82, the outside of lift section of thick bamboo 82 articulates there is diagonal brace 83, diagonal brace 83 slides from top to bottom at telescopic link 81 outside through lift section of thick bamboo 82, realize adjusting its supporting height's effect, the bottom of diagonal brace 83 and the both ends of telescopic link 81 are all connected with fixture 85 through universal joint 84, thereby be convenient for fixture 85 through universal joint 84 regulation clamping angle and direction, the last screw thread of lift section of thick bamboo 82 runs through and is provided with the locking bolt for the high position of fixed lift section of thick bamboo 82, thereby can be with cooling water pipe 2 centre gripping on the top of supporting mechanism 8, the bottom of telescopic link 81 and diagonal brace 83 erect on the reinforcing bar net piece of its below, form effective triangle support, thereby avoid cooling water pipe 2 to make unnecessary displacement appear at the concreting.
In a preferred embodiment, the telescoping rod 81 is a threaded telescoping rod, and the length adjustment can be achieved by rotation of the inner and outer rods.
The fixture 85 includes the pole setting 850 that is connected with universal joint 84 one end, and connecting seat 851 has been set firmly at the top of pole setting 850, can dock with reinforcing bar or condenser tube 2, and the both ends of connecting seat 851 all are provided with clamping assembly 852, and the clamping assembly 852 through both ends realizes fixed to reinforcing bar or condenser tube 2 centre gripping, and the outside of pole setting 850 is provided with the control assembly 853 that is used for controlling clamping assembly 852 to carry out the centre gripping.
The clamping assembly 852 comprises two clamps 8520 with middle parts being hinged in a crossed mode through a connecting shaft 8521, the two clamps 8520 form a scissor-shaped clamping structure, the bottom ends of the two clamps 8520 are hinged to be provided with transmission rods 8522, the bottom ends of the two transmission rods 8522 are hinged to a control seat 8523, the end portion of the connecting shaft 8521 is fixedly connected with the connecting seat 851, and therefore the clamping effect of the two clamps 8520 can be controlled through adjusting the lifting of the control seat 8523.
The outside of the upright 850 is provided with a screw thread and two opposite side elevating grooves 8500.
The control assembly 853 comprises a lifting ring 8530 movably sleeved outside the upright 850, a limiting block 8531 slidably connected with the lifting groove 8500 is arranged on the inner wall surface of the lifting ring 8530, two opposite extending plates 8532 are arranged on the outer wall surface of the lifting ring 8530, the extending plates 8532 are fixedly connected with the bottoms of the corresponding control seats 8523, the lifting ring 8530 can be lifted outside the upright 850 through the limiting block 8531 and the limiting of the lifting groove 8500, and accordingly lifting of the two control seats 8523 is controlled by the aid of the two extending plates 8532 respectively, and the effect of synchronous clamping of the two clamping assemblies 852 is further achieved.
The external thread of the vertical rod 850 is sleeved with an internal thread sleeve 8533, the top of the internal thread sleeve 8533 is rotatably connected with the bottom of the lifting ring 8530, and the lifting ring 8530 can be driven to achieve lifting effect by rotating and lifting the vertical rod 850 through the internal thread sleeve 8533.
The bottom of lift ring 8530 is provided with integrated into one piece's cross-section and is the go-between 8535 of T font, and the top of internal thread sleeve 8533 is provided with the rotatory annular 8534 with go-between 8534 looks adaptation, and go-between 8535 slides and sets up in rotatory annular 8534, and then has realized above-mentioned rotatable coupling's function.
The top of connecting seat 851 and the clamping end of clamp 8520 all are provided with the arc groove with reinforcing bar and cooling water pipe 2 looks adaptation, are convenient for with reinforcing bar or cooling water pipe 2 centre gripping wherein, and the inslot is provided with the sheet rubber.
Example 4
Further described in connection with example 1, a method for constructing a concrete curing temperature control of a large-volume raft foundation, the method comprising:
s1, splicing reinforcement meshes of the raft 1, arranging coiled cooling water pipes 2 in the reinforcement meshes, and arranging a temperature sensor;
s2, installing a template 4, wherein the top end of the template 4 is higher than the top surface of the formed raft 1, an insulation layer can be formed, the water inlet and outlet ends of the cooling water pipes 2 penetrate through the template 4 and extend to the outside of the template, and then the concrete pouring work of the raft 1 is completed;
S3, connecting the water inlet end of the cooling water pipe 2 with the circulating system 3, penetrating the water outlet end of the cooling water pipe into and out of the template 4 higher than the top surface of the raft 1, connecting the cooling water pipe with the circulating system 3 after penetrating through the heat preservation layer to form a circulating cooling loop, arranging a temperature sensor in the heat preservation layer, and arranging a drain valve 206 on a pipe section of the cooling water pipe 2 positioned in the heat preservation layer;
s4, a recovery system with one end communicated with the heat preservation layer and the other end connected with the circulation system 3 is arranged on the template 4, and a filter 210 is arranged in the recovery system;
S5, covering the top of the template 4 with a heat-insulating cover 5 to seal the top of the heat-insulating layer;
S6, starting a circulation system 3, and forming a circulation temperature control loop inside and outside the raft 1;
and S7, monitoring the temperature inside the raft 1 and in the heat preservation layer through temperature sensors, and when the temperature difference between the temperature sensor and the heat preservation layer is too large, opening a drain valve 206 to drain the water subjected to heat conversion from the raft 1 into the heat preservation layer, and simultaneously starting a recovery system to form a further balance circulation temperature control loop.
The above embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (10)
1. A concrete curing temperature control structure for a large-volume raft foundation comprises a raft (1) and is characterized in that a template (4) surrounding the raft is arranged outside the raft (1), the top of the template (4) is higher than the top surface of the raft (1) to form a heat insulation layer, a coiled cooling water pipe (2) is arranged on a reinforcing steel mesh inside the raft (1), water inlet and outlet ends of the cooling water pipe (2) extend to the outside of the raft through the template (4), a circulation system (3) is communicated with the water inlet ends, the water outlet ends penetrate through the template (4) higher than the top surface of the raft (1), and then are connected with the circulation system (3) to form a circulation cooling loop after penetrating through the heat insulation layer, and a heat insulation cover (5) for sealing the top of the heat insulation layer is arranged on the top cover of the template (4).
2. The concrete curing temperature control structure for the large-volume raft foundation is characterized in that temperature sensors are uniformly distributed in the raft (1) and the heat insulation layer.
3. The concrete curing temperature control structure for the large-volume raft foundation according to claim 2 is characterized in that a drain valve (206) is arranged on a cooling water pipe (2) positioned in the heat preservation layer, circulating water in the cooling water pipe (2) can be discharged into the heat preservation layer, one end of the side surface of the template (4) is communicated with the heat preservation layer, and the other end of the template is connected with a recycling system (3).
4. The high-volume raft foundation concrete curing temperature control structure according to claim 3, wherein the cooling water pipe (2) comprises a water inlet pipe (201) penetrating through the template (4) and inserted into the raft (1), the insertion end of the water inlet pipe (201) is communicated with two cooling pipes (203) through a first tee joint (202), the two cooling pipes (203) are coiled and distributed on a reinforcing steel mesh, the water outlet end is communicated with two branch pipes (205) through a second tee joint (204), the branch pipes (205) penetrate out of the template (4) and penetrate into the heat insulation layer, a water drainage valve (206) is arranged on a pipe section of the heat insulation layer, the end parts of the four branch pipes (205) are communicated with a concentrated pipe (207), and the middle part of the concentrated pipe (207) is communicated with a circulating pipe (208) connected with the circulating system (3) through the template (4);
The circulating system (3) comprises a water collecting pit (301), a temperature rising device (302) and a circulating water pump (303) which are sequentially connected through pipelines, wherein the output end of the circulating water pump (303) is connected with a water inlet pipe (201), and a circulating pipe (208) is connected with the water collecting pit (301);
The recovery system comprises a drain pipe (209) which penetrates through the template (4) and is communicated with the heat preservation layer, the other end of the drain pipe (209) is connected with a water inlet end of a filter (210), and a water outlet end of the filter (210) is connected with a temperature rising device (302) through a recovery pipe (211).
5. The concrete curing temperature control structure for the large-volume raft foundation is characterized in that the heat preservation cover (5) is a mineral wool quilt, the templates (4) are steel templates, track assemblies (6) are arranged at the tops of the two opposite templates (4), and an automatic retraction mechanism (7) for retracting the heat preservation cover (5) is erected on the two track assemblies (6);
the automatic retraction mechanism (7) comprises two moving mechanisms (71) which are respectively and movably arranged on the track assembly (6), and a retraction shaft (72) which is in transmission connection with the two moving mechanisms (71);
a hooking plate (401) is fixedly arranged on the outer side of the top of the template (4) at the end part;
one end of the heat preservation cover (5) is fixed on the winding shaft (72), and the other end is connected with a hooking strip (501) which can be hooked with the hooking plate (401).
6. The high volume raft foundation concrete curing temperature control structure of claim 5, wherein the track assembly (6) comprises a T-shaped slide rail (602) and a rack (601) which are arranged in parallel;
The moving mechanism (71) comprises a moving seat (710), a sliding seat (711) which is in sliding connection with the T-shaped sliding rail (602) is arranged at the bottom of the moving seat (710), a transmission shaft (712) is rotatably arranged at the middle of the moving seat in a penetrating way through a bearing, a traveling gear (713) meshed with the rack (601) is arranged outside the transmission shaft (712), and two ends of the winding shaft (72) are respectively connected with the end parts of the transmission shafts (712) of the two moving mechanisms (71);
One of them is provided with actuating mechanism on moving mechanism (71), and actuating mechanism is including setting up backup pad (714) on moving seat (710) top, is provided with drive arrangement (715) on backup pad (714), and drive sprocket (716) are installed to the output of drive arrangement (715), and the tip of transmission shaft (712) is provided with driven sprocket (717) corresponding with drive sprocket (716), and drive sprocket (716) are equipped with chain (718) with the outside cover of driven sprocket (717).
7. The structure according to claim 6, wherein the automatic retraction mechanism (7) further comprises a flattening component (73) arranged between the two moving mechanisms (71), the flattening component (73) comprises mounting seats (730) arranged at opposite ends of the two moving seats (710), and a flattening roller (731) arranged between the two mounting seats (730), and the bottom of the flattening roller (731) is level with the height of the top end of the template (4);
The automatic retracting mechanism (7) further comprises a retracting compaction assembly (74) which is arranged between the two moving mechanisms (71) and is attached to the heat preservation cover (5) on the retracting shaft (72), the retracting compaction assembly (74) comprises rotary bearings (740) which are respectively arranged on the opposite sides of the two moving seats (710), rotary parts (741) are rotatably connected to the rotary bearings (740) through rotary shafts, compaction rollers (742) are rotatably arranged between the two rotary parts (741), and reset torsion springs which are used for keeping the attaching relation of the compaction rollers (742) and the heat preservation cover (5) are sleeved on the rotary shafts.
8. The large-volume raft foundation concrete curing temperature control structure according to claim 1 is characterized in that a cooling water pipe (2) is fixed on a reinforcing steel mesh inside a raft (1) through a supporting mechanism (8);
The supporting mechanism (8) comprises a telescopic rod (81), a lifting cylinder (82) is sleeved outside the telescopic rod (81) in a sliding mode, an inclined supporting rod (83) is hinged to the outer portion of the lifting cylinder (82), clamping mechanisms (85) are connected to the bottom of the inclined supporting rod (83) and two ends of the telescopic rod (81) through universal joints (84), and locking bolts penetrate through upper threads of the lifting cylinder (82).
9. The high-volume raft foundation concrete curing temperature control structure according to claim 8, which is characterized in that the telescopic rod (81) is a threaded telescopic rod;
The clamping mechanism (85) comprises a vertical rod (850) connected with one end of the universal joint (84), a connecting seat (851) is arranged at the top of the vertical rod (850), clamping components (852) are arranged at two ends of the connecting seat (851), and a control component (853) for controlling the clamping components (852) to clamp is arranged outside the vertical rod (850);
The clamping assembly (852) comprises two clamps (8520) with the middle parts hinged in a crossed manner through a connecting shaft (8521), transmission rods (8522) are hinged at the bottom ends of the two clamps (8520), the bottom ends of the two transmission rods (8522) are hinged with a control seat (8523), and the end part of the connecting shaft (8521) is connected with the connecting seat (851);
the outside of the upright (850) is provided with a thread wire and two opposite lifting grooves (8500);
The control assembly (853) comprises a lifting ring (8530) movably sleeved outside the vertical rod (850), a limiting block (8531) which is slidably connected with the lifting groove (8500) is arranged on the inner wall surface of the lifting ring (8530), two extension plates (8532) on opposite sides are arranged on the outer wall surface of the lifting ring, the extension plates (8532) are fixedly connected with the bottoms of the corresponding control seats (8523), an internal thread sleeve (8533) is sleeved on the external thread of the vertical rod (850), and the top of the internal thread sleeve (8533) is rotatably connected with the bottom of the lifting ring (8530);
The bottom of the lifting ring (8530) is provided with a connecting ring (8535) with a T-shaped cross section, the top of the internal thread sleeve (8533) is provided with a rotary ring groove (8534) matched with the connecting ring (8534), and the connecting ring (8535) is arranged in the rotary ring groove (8534) in a sliding way;
the top of connecting seat (851) and the clamping end of clamp (8520) are all provided with the arc groove with reinforcing bar and condenser tube (2) looks adaptation, and the inslot is provided with the sheet rubber.
10. The concrete curing temperature control construction method for the large-volume raft foundation is characterized by comprising the following steps of:
S1, splicing reinforcement meshes of the raft (1), arranging coiled cooling water pipes (2) in the reinforcement meshes, and arranging a temperature sensor;
s2, installing a template (4), wherein the top end of the template (4) is higher than the top surface of the formed raft (1), an insulating layer can be formed, the water inlet and outlet ends of the cooling water pipes (2) penetrate through the template (4) and extend to the outside of the template, and then the concrete pouring work of the raft (1) is completed;
S3, connecting a water inlet end of the cooling water pipe (2) with the circulating system (3), enabling a water outlet end to penetrate in and out from a template (4) higher than the top surface of the raft plate (1), connecting the template with the circulating system (3) after penetrating through the heat insulation layer to form a circulating cooling loop, arranging a temperature sensor in the heat insulation layer, and simultaneously arranging a drain valve (206) on a pipe section of the cooling water pipe (2) positioned on the heat insulation layer;
S4, a recovery system with one end communicated with the heat preservation layer and the other end connected with the circulation system (3) is arranged on the template (4), and a filter (210) is arranged in the recovery system;
s5, covering the top of the template (4) with a heat-insulating cover (5) to seal the top of the heat-insulating layer;
S6, starting a circulating system (3), and forming a circulating temperature control loop inside and outside the raft (1);
and S7, monitoring the temperature inside the raft (1) and in the heat preservation layer through temperature sensors, and when the temperature difference between the raft and the heat preservation layer is too large, opening a drain valve (206) to enable water subjected to heat conversion in the raft (1) to be discharged into the heat preservation layer, and simultaneously opening a recovery system to form a further balance circulation temperature control loop.
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| CN202411185380.0A CN119041471A (en) | 2024-08-27 | 2024-08-27 | Large-volume raft foundation concrete curing temperature control structure and construction method thereof |
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