CN110685223A - Sealing material construction process suitable for snow melting and deicing of bridge deck - Google Patents
Sealing material construction process suitable for snow melting and deicing of bridge deck Download PDFInfo
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- CN110685223A CN110685223A CN201910893979.2A CN201910893979A CN110685223A CN 110685223 A CN110685223 A CN 110685223A CN 201910893979 A CN201910893979 A CN 201910893979A CN 110685223 A CN110685223 A CN 110685223A
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- 238000010276 construction Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002844 melting Methods 0.000 title claims abstract description 18
- 230000008018 melting Effects 0.000 title claims abstract description 18
- 239000003566 sealing material Substances 0.000 title claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 103
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 68
- 239000004917 carbon fiber Substances 0.000 claims abstract description 68
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000004567 concrete Substances 0.000 claims abstract description 41
- 239000004568 cement Substances 0.000 claims abstract description 26
- 239000011384 asphalt concrete Substances 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000002787 reinforcement Effects 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 24
- 238000009413 insulation Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 15
- 238000013461 design Methods 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010426 asphalt Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010297 mechanical methods and process Methods 0.000 abstract description 2
- 230000005226 mechanical processes and functions Effects 0.000 abstract description 2
- 230000004083 survival effect Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000003892 spreading Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
- E01C11/26—Permanently installed heating or blowing devices ; Mounting thereof
- E01C11/265—Embedded electrical heating elements ; Mounting thereof
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a sealing material construction process suitable for snow melting and deicing of a bridge deck, which comprises the following process flows of construction preparation, reinforcement mesh erection, carbon fiber heating wire arrangement, power supply wiring and sheath pipes, cement concrete pouring, asphalt concrete paving and compacting, and intelligent temperature control system installation. The invention has the advantages that: the construction method has the advantages that all procedures are closely linked, so that repeated operation in the construction process is avoided, and meanwhile, waste of mechanical process and labor is avoided; the construction method is simple and practical, the survival rate of the carbon fiber heating wire is high, the snow melting and deicing effects are obvious, intelligent temperature control can be achieved, the accumulated snow of the bridge is placed and iced, energy and labor cost are saved, and the economic benefit is obvious.
Description
Technical Field
The invention relates to the technical field of bridge deck snow melting and deicing, in particular to a construction process of a sealing material suitable for the bridge deck snow melting and deicing.
Background
According to data, the bridge deck ice condensation becomes a major potential hazard of bridge deck traffic safety in winter. The bridge deck ice is an ice layer generated by condensation of 'freezing rain' on a low-temperature road surface. The disasters caused by ice condensation are different from the common disasters of accumulated snow on the bridge deck, the accumulated snow disasters mostly occur in northern cold areas, and ice melting can not be left on the bridge deck due to lower air temperature and air humidity. After the accumulated snow is compacted by the running of the automobile, the friction force of the accumulated snow is far higher than that of the ice in a surface wet state, and the automobile can still run safely on the snow surface even on an uphill road section after a tire of the automobile is additionally provided with an anti-skid chain. The freezing disaster mostly occurs in cold and humid winter in south, road condensation usually occurs in a temperature range with air temperature slightly lower than 0 ℃, the surface of the road ice is in a wet state, and a water film on the ice causes the friction force of the bridge floor to be obviously reduced, thereby seriously threatening the controllability and the driving safety of the motor vehicle.
The ice and snow greatly reduces the bridge deck adhesion coefficient, and can cause the automobile to slip, the braking distance to be lengthened, even the automobile is out of order and the direction is out of control, thereby causing serious traffic safety hidden troubles. Therefore, in order to ensure the safety of lives and properties of people and provide a safe traffic driving environment, the research on the technology for removing ice and snow on the bridge deck in winter is necessary. As yet, the long-term efforts of road workers at home and abroad have been successful. However, the traditional ice and snow removing method for bridge surfaces at home and abroad has the defects of high labor intensity, low ice and snow removing efficiency, serious environmental pollution and the like at different degrees. Therefore, aiming at the defects of the traditional ice and snow removing method, the active ice and snow removing technology with high efficiency and environmental protection becomes the key point of domestic and overseas research.
Based on the situations, the tasks of deicing and snow removal are particularly urgent when the road section enters winter, each region of traffic department spends a large amount of manpower and material resources for deicing and snow removal every year, and the bridge deck ice and snow can not be effectively cleaned in remote regions, so that the driving risk of the road section is greatly increased. Therefore, a convenient and quick deicing and snow removing mode is developed, the ice and the snow on the bridge floor can be timely and effectively treated, the harm caused by the ice and the snow on the road can be obviously reduced, traffic accidents are reduced, and the method has great social significance and economic benefit. Meanwhile, the future active ice and snow removing technology has the advantages of environmental friendliness, no damage to bridge deck facilities, high efficiency, low energy and the like, and plays an important role in green energy development, environmental protection and sustainable development.
Disclosure of Invention
In order to solve the technical problems, the invention provides a sealing layer material construction process suitable for a bridge deck snow melting and deicing technology.
The invention adopts the following technical scheme: a sealing material construction process suitable for snow melting and deicing of a bridge deck comprises the following process flows of construction preparation, reinforcement mesh erection, carbon fiber heating wire arrangement, power supply wiring and protecting sleeves, cement concrete pouring, asphalt concrete paving and compacting, and intelligent temperature control system installation;
construction preparation: construction drawings and other technical documents are prepared; carrying out safety technology bottom-crossing on constructors; the main project of the bridge is finished and is qualified after acceptance; materials, construction machines and tools and the like are ready, and normal construction can be guaranteed; the appearance quality and the electric heating performance of the carbon fiber heating wire are qualified through acceptance; temporary electricity utilization facilities need to be arranged on a construction site; the bridge deck needs to be cleaned up to achieve integral flatness, and the difference between the local concave-convex condition and the integral flatness is not more than 15 mm; the bridge deck has no sundries, and the redundant metal objects such as steel bars and the like are clear and clean; an operation space is needed on a construction site to meet the requirement of construction; the environmental temperature of the construction site is lower than 5 ℃, and the construction is not suitable;
erecting a reinforcing mesh: erecting a reinforcing mesh according to the laying height requirement of the carbon fiber heating wire, wherein the height of the reinforcing mesh is not more than the designed elevation of the cement concrete laying layer, and reinforcing steel bars are arranged below the reinforcing mesh at intervals in order to ensure the overhead height of the reinforcing mesh;
welding a plurality of support columns on the upper part of the cement concrete layer, welding vertical rods on the support columns, welding a cross rod on each vertical rod, binding a reinforcing mesh outside the cross rod and the vertical rods, and binding the reinforcing mesh through binding wires;
laying a carbon fiber heating wire: binding the carbon fiber heating wires on the reinforcing mesh according to the U-shaped trend by using binding wires, wherein the carbon fiber heating wires are preferably arranged on the side surfaces or the bottom of the reinforcing mesh, the arrangement distance of the carbon fiber heating wires is preferably 5-10 cm, and the arrangement distance is determined according to the arrangement power; the binding is tight and firm, and the binding distance does not exceed 20 cm; the carbon fiber heating wire is laid to be attractive and straight, the minimum bending radius is 5 times of the diameter of the heating wire, after the carbon fiber heating wire is laid, a digital multimeter is used for testing the actual resistance value of each path, the product is explained to judge whether the nuclear resistance system tolerance is qualified, a 500V megohmmeter is used for measuring whether the insulation resistance of the heating wire is smaller than a specified value, the phenomena of open circuit and short circuit of all the heating wires are ensured, and the carbon fiber heating wire is qualified after acceptance and acceptance;
power connection and protective sleeve: a power line connected into a power control cabinet penetrates through a preformed hole in a bridge anti-collision wall and is led to a laid carbon fiber heating line, the power line penetrating through the preformed hole is sleeved into a protective pipe according to the specification, and a joint is strictly forbidden in the protective pipe; the power line is connected with the carbon fiber heating wire through a junction box; after the wiring is finished and before the cement concrete is poured, the nominal resistance and the insulation resistance of each group of heating wires must be checked again, and if the heating wires are damaged in the construction process, the heating wires can be found and processed in time;
laying reinforced concrete hollow slabs: firstly, inspecting and correcting a template, sequentially installing stressed main ribs, binding stirrups and distribution ribs after installing an inner mold of the hollow plate, then installing a side template, and then performing quality self-inspection and joint inspection;
pouring cement concrete: all the carbon fiber heating wires and the temperature sensors are installed, concrete can be poured after the carbon fiber heating wires and the temperature sensors are detected by a universal meter and qualified through a power-on detection (each heating cable is heated), when the concrete is poured, a cement concrete conveying pump discharges materials to be attached to a bridge floor as far as possible, a three-roller spreading machine is adopted for spreading the cement concrete, and the thickness of a concrete layer is ensured to meet the design requirement; after the vibration is finished, the nominal resistance and the insulation resistance of each group of heating wires are immediately checked, the concrete is cured after being laid, and after the curing period is over, the nominal resistance and the insulation resistance of the carbon fiber heating wires are checked again;
paving and compacting the asphalt concrete: paving and compacting the asphalt concrete according to the design requirements, and after the curing period is over, carrying out a power-on heating test for 48 hours;
installing an intelligent temperature control system: drilling a hole with the depth of 2cm on the carbon fiber heating bridge surface, wherein the position of the hole is preferably located at the central position of a heating area as much as possible, and fixing a sensing end of a temperature sensor in the hole; in addition, a wire groove capable of laying a signal transmission line of a temperature sensor is formed in the bridge floor, the output end of the temperature sensor is led out of the bridge floor to be connected with a temperature controller, and the wire groove is filled with asphalt mortar; the output end of the temperature controller is connected with an alternating current contactor.
Furthermore, the carbon fiber heating wire is arranged and fixed on the side surface or the bottom of the reinforcing mesh according to the U-shaped trend.
Further, the cement concrete should be vibrated by a surface vibrator.
Furthermore, the spreading speed of the spreading machine is 2-3m/min, the vibration frequency of a rammer of the spreading machine is 550-650r/min, and the spreading temperature is not lower than 100 ℃.
Furthermore, the power line connector should be installed in the junction box, and the power line passing through the hole must be sleeved into the protection tube.
Further, the power supply voltage is 200V-230V.
Compared with the prior art, the invention has the advantages that: the construction method has the advantages that all procedures are closely linked, so that repeated operation in the construction process is avoided, and meanwhile, waste of mechanical process and labor is avoided; the construction method is simple and practical, the survival rate of the carbon fiber heating wire is high, the snow melting and deicing effects are obvious, intelligent temperature control can be achieved, the bridge can be placed to accumulate snow and freeze, energy and labor cost are saved, and the economic benefit is obvious.
Detailed Description
The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the scope of the present invention can be clearly and clearly defined.
A sealing material construction process suitable for snow melting and deicing of a bridge deck comprises the following process flows of construction preparation, reinforcement mesh erection, carbon fiber heating wire arrangement, power supply wiring and protecting sleeves, cement concrete pouring, asphalt concrete paving and compacting, and intelligent temperature control system installation;
construction preparation: construction drawings and other technical documents are prepared; carrying out safety technology bottom-crossing on constructors; the main project of the bridge is finished and is qualified after acceptance; materials, construction machines and tools and the like are ready, and normal construction can be guaranteed; the appearance quality and the electric heating performance of the carbon fiber heating wire are qualified through acceptance; temporary electricity utilization facilities need to be arranged on a construction site; the bridge deck needs to be cleaned up to achieve integral flatness, and the difference between the local concave-convex condition and the integral flatness is not more than 15 mm; the bridge deck has no sundries, and the redundant metal objects such as steel bars and the like are clear and clean; an operation space is needed on a construction site to meet the requirement of construction; the environmental temperature of the construction site is lower than 5 ℃, and the construction is not suitable;
erecting a reinforcing mesh: erecting a reinforcing mesh according to the laying height requirement of the carbon fiber heating wire, wherein the height of the reinforcing mesh is not more than the designed elevation of the cement concrete laying layer, and reinforcing steel bars are arranged below the reinforcing mesh at intervals in order to ensure the overhead height of the reinforcing mesh;
laying a carbon fiber heating wire: the carbon fiber heating wires are bound on the reinforcing steel bar net according to the U-shaped trend by adopting the binding wires, and the carbon fiber heating wires are preferably arranged on the side surfaces or the bottoms of the reinforcing steel bars. The arrangement distance of the carbon fiber heating wires is preferably 5-10 cm, and is determined according to the design laying power; the binding is tight and firm, and the binding distance does not exceed 20 cm; the carbon fiber heating wire is laid to be attractive and straight, the minimum bending radius is 5 times of the diameter of the heating wire, after the carbon fiber heating wire is laid, a digital multimeter is used for testing the actual resistance value of each path, the product is explained to judge whether the nuclear resistance system tolerance is qualified, a 500V megohmmeter is used for measuring whether the insulation resistance of the heating wire is smaller than a specified value, the phenomena of open circuit and short circuit of all the heating wires are ensured, and the carbon fiber heating wire is qualified after acceptance and acceptance;
power connection and protective sleeve: a power line connected into a power control cabinet penetrates through a preformed hole in a bridge anti-collision wall and is led to a laid carbon fiber heating line, the power line penetrating through the preformed hole is sleeved into a protective pipe according to the specification, and a joint is strictly forbidden in the protective pipe; the power line is connected with the carbon fiber heating wire through a junction box; after the wiring is finished and before the cement concrete is poured, the nominal resistance and the insulation resistance of each group of heating wires must be checked again, and if the heating wires are damaged in the construction process, the heating wires can be found and processed in time;
laying reinforced concrete hollow slabs: firstly, inspecting and correcting a template, sequentially installing stressed main ribs, binding stirrups and distribution ribs after installing an inner mold of the hollow plate, then installing a side template, and then performing quality self-inspection and joint inspection;
pouring cement concrete: all the carbon fiber heating wires and the temperature sensors are installed, concrete can be poured after the carbon fiber heating wires and the temperature sensors are detected by a universal meter and qualified through a power-on detection (each heating cable is heated), when the concrete is poured, a cement concrete conveying pump discharges materials to be attached to a bridge floor as far as possible, a three-roller spreading machine is adopted for spreading the cement concrete, and the thickness of a concrete layer is ensured to meet the design requirement; after the vibration is finished, the nominal resistance and the insulation resistance of each group of heating wires are immediately checked, the concrete is cured after being laid, and after the curing period is over, the nominal resistance and the insulation resistance of the carbon fiber heating wires are checked again;
paving and compacting the asphalt concrete: paving and compacting the asphalt concrete according to the design requirements, and after the curing period is over, carrying out a power-on heating test for 48 hours;
installing an intelligent temperature control system: drilling a hole with the depth of 2cm on the carbon fiber heating bridge surface, wherein the position of the hole is preferably located at the central position of a heating area as much as possible, and fixing a sensing end of a temperature sensor in the hole; in addition, a wire groove capable of laying a signal transmission line of a temperature sensor is formed in the bridge floor, the output end of the temperature sensor is led out of the bridge floor to be connected with a temperature controller, and the wire groove is filled with asphalt mortar; the output end of the temperature controller is connected with an alternating current contactor.
Furthermore, the carbon fiber heating wires are arranged and fixed on the side surface or the bottom of the reinforcing mesh according to the U-shaped trend, the distance does not exceed 20cm, the carbon fiber heating wires are laid straight, and the bending radius is not less than 5 times of the diameter of the heating wires.
Further, the cement concrete should be vibrated by a surface vibrator.
Furthermore, the spreading speed of the spreading machine is 2-3m/min, the vibration frequency of a rammer of the spreading machine is 550-650r/min, and the spreading temperature is not lower than 100 ℃.
Furthermore, the power line connector should be installed in the junction box, and the power line passing through the hole must be sleeved into the protection tube.
Further, the power supply voltage is 200V-230V.
And (3) selecting the arrangement intervals of two carbon fiber heating wires, namely 5cm and 10cm respectively, and the burial depth is 3cm, and paving two sections of adjacent bridge floors. Because the climate in the area has the characteristics of low temperature and high wind speed in winter, in order to achieve a better heating effect, a 24K carbon fiber heating wire is selected under the condition that the layout parameters of the heating wire and the input voltage are not changed, the paving power is increased, and the snow melting effect is improved.
When concrete with different mix proportions is poured in layers, extra mixing equipment or storage equipment is required to be added for ensuring continuous pouring of concrete on the upper layer and the lower layer, so that the upper layer material and the lower layer material of the carbon fiber heating wire are made of common concrete with the same mix proportion. The concrete mix for each structural layer is shown in tables 8.1 to 8.3.
TABLE 8.1C 50 Cement concrete mix proportions
| Raw material | Cement | Sand | Crushing stone | Water (W) | Water reducing agent |
| Ratio/%) | 19.8 | 24.9 | 48.3 | 6.5 | 0.5 |
TABLE 8.2 AC-20 asphalt concrete mix proportion
| Aggregate particle size/mm | 15-20 | 10-15 | 5-10 | 3-5 | 0-3 | Mineral powder |
| Ratio/%) | 24 | 22 | 21 | 4 | 26 | 3 |
TABLE 8.3 mixing ratio of SMA-13 asphalt concrete
| Aggregate pelletDiameter/mm | 10-15 | 5-10 | 0-3 | Mineral powder |
| Ratio/%) | 60 | 18 | 13 | 9 |
The carbon fiber heating wire is required to meet the regulation of carbon fiber infrared electric heating wire and has a product qualification certificate, the number of the monofilaments of 24K or 36K can be adopted, and the wire power is determined according to the specific design requirement;
the number of the carbon fiber heating cables is calculated according to a formula:
1) area designed power-total power
3) Total power/single power being root number
3) Radical single power-actual power
The power supply design of the carbon fiber heating cable comprises the following steps:
the electric power design is to use the radiation type according to the heating demand condition and the on-site power supply and distribution capacity of the carbon fiber heating cable.
The power design should take into account the problem of power supply design load capacity increase. And if the power supply capacity can not meet the requirement of load capacity increase, the requirement of increasing the power supply load to a power supply department is required. Total power/voltage/8 × 1.2.
Each index of the carbon fiber heating cable is as follows:
1. technical indexes of carbon fiber heating cable
i. The heating starting voltage is: 1.5v (dc);
ii, working voltage range is 12V-220V;
the resistance value range of the flexible electric heating wire is 17-20 omega/M;
iv, the heat-resisting temperature of the coating material is 105 ℃; at 150 ℃.
v. diameter of the heating wire: phi 6.0mm
vi, thermal efficiency is more than or equal to 98 percent
2. Safety indexes of the carbon fiber heating cable are as follows:
and (4) safety inspection conditions:
i. a heating power supply: (AC) 220V.
And ii, in the working state of the 200W power-on loop.
Safety inspection results
i. In the air of normal temperature (with enough heat radiation)
insulation resistance: not less than 500M omega
insulation strength: 5000V (AC) (1min, 50HZ withstand voltage, no flicker breakdown.)
Leakage current: less than or equal to 0.02mA
In the air at normal temperature (keeping the heating at 80℃)
i. Insulation resistance: not less than 500M omega
insulating strength: 4000V (AC) (1min, 50HZ withstand voltage, no flicker breakdown.)
Leakage current: less than or equal to 0.02mA
Soaking in 0.8% normal temperature saline water
i. Insulation resistance: not less than 500M omega
insulating strength: 4000V (AC) (1min, 50HZ withstand voltage, no flicker breakdown.)
Leakage current: less than or equal to 0.02mA
Soaking in 0.8% 80 deg.C saline
i. An insulating electric group: not less than 200M omega
insulating strength: 4000V (AC) (1min, 50HZ withstand voltage, no flicker breakdown.)
Leakage current: less than or equal to 0.02mA
The mechanical strength carbon fiber heating body has no damage to the 50000 times of concave folding (30 times/minute) electrified carbon fiber and the coating material under the working state of the electrified loop with the working current of 50 mA. The forward pressure of 9.8 newtons per square centimeter did not fail.
Insulation resistance: not less than 500M omega
3. Parameters of the carbon fiber heating cable:
strength: (tensile Strength >3.5Gpa)
Elasticity: (tensile modulus >230GPa) bending resistance >5000 times
The electrothermal conversion efficiency is more than 98 percent
The electrical strength is 2500V/min in water, and the electric wire is not punctured and flashover is avoided;
leakage current is less than or equal to 0.25mA
Insulating strength: not less than 500M omega;
average insulation thickness: 0.6mm
Thickness of the thinnest point of insulation: 0.59mm
Average thickness of the sheath: 0.8mm
Thinnest point thickness of the sheath: 0.75mm
Average outer diameter: 6mm
Melting point: 195 deg.C
Thermal conductivity: (lambda) 0.16W/m.K
Coefficient of thermal expansion: (alpha) 810-5/K
Water absorption: (ASTM)0.04-0.4
Heat generation amount: 18W/m
External protection: and an armored reinforcement mode is adopted.
Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (6)
1. A sealing material construction process suitable for snow melting and deicing of a bridge deck is characterized in that the process flow comprises construction preparation, reinforcement mesh erection, carbon fiber heating wire arrangement, power supply wiring and sheath pipes, reinforced concrete hollow plate arrangement, cement concrete pouring, asphalt concrete paving compaction and intelligent temperature control system installation;
construction preparation: construction drawings and other technical documents are prepared; carrying out safety technology bottom-crossing on constructors; the main project of the bridge is finished and is qualified after acceptance; materials, construction machines and tools and the like are ready, and normal construction can be guaranteed; the appearance quality and the electric heating performance of the carbon fiber heating wire are qualified through acceptance; temporary power utilization facilities need to be arranged on a construction site; the bridge deck needs to be cleaned up to achieve integral flatness, and the difference between the local concave-convex condition and the integral flatness is not more than 15 mm; the bridge deck has no sundries, and the redundant metal objects such as steel bars and the like are clear and clean; an operation space is needed on a construction site to meet the requirement of construction; the environmental temperature of the construction site is lower than 5 ℃, and the construction is not suitable;
erecting a reinforcing mesh: erecting a reinforcing mesh according to the laying height requirement of the carbon fiber heating wire, wherein the height of the reinforcing mesh is not more than the designed elevation of a cement concrete laying layer, and in order to ensure the overhead height of the reinforcing mesh, reinforcing steel bars are arranged under the reinforcing mesh at intervals;
welding a plurality of support columns on the upper part of the cement concrete layer, welding vertical rods on the support columns, welding a cross rod on each vertical rod, binding a reinforcing mesh outside the cross rod and the vertical rods, and binding the reinforcing mesh through binding wires;
laying a carbon fiber heating wire: binding the carbon fiber heating wires on the reinforcing steel bar net according to the U-shaped trend by using binding wires, wherein the carbon fiber heating wires are preferably arranged on the side surfaces or the bottom of the reinforcing steel bars, the arrangement distance of the carbon fiber heating wires is preferably 5-10 cm, and the arrangement distance is determined according to the arrangement power; the binding is tight and firm, and the binding distance does not exceed 20 cm; the carbon fiber heating wire is laid to be attractive and straight, the minimum bending radius is 5 times of the diameter of the heating wire, after the carbon fiber heating wire is laid, a digital multimeter is used for testing the actual resistance value of each path, the product is explained to check whether the tolerance of a resistance system is qualified, and a 500V megohmmeter is used for measuring whether the insulation resistance of the heating wire is smaller than a specified value, so that the phenomenon of open circuit and short circuit of all the heating wires is ensured;
power connection and protective sleeve: a power line connected into a power control cabinet penetrates through a preformed hole in the anti-collision wall of the bridge and is led to the laid carbon fiber heating line, the power line penetrating through the preformed hole is sleeved into a protective pipe according to the specification, and a joint is strictly forbidden in the protective pipe; the power line is connected with the carbon fiber heating wire through a junction box; after the wiring is finished and before the cement concrete is poured, the nominal resistance and the insulation resistance of each group of heating wires must be checked again, and if the heating wires are damaged in the construction process, the heating wires can be found and processed in time;
laying reinforced concrete hollow slabs: firstly, inspecting and correcting a template, sequentially installing stressed main ribs, binding stirrups and distribution ribs after installing an inner mold of the hollow plate, then installing a side template, and then performing quality self-inspection and joint inspection;
pouring cement concrete: all the carbon fiber heating wires and the temperature sensors are installed, concrete can be poured after the carbon fiber heating wires and the temperature sensors are checked by a universal meter and pass through a power-on check, when the concrete is poured, a cement concrete conveying pump discharges materials to be attached to a bridge floor as far as possible, a three-roller paver is adopted for cement concrete paving, and the thickness of a concrete layer is ensured to meet the design requirement; after the vibration is finished, the nominal resistance and the insulation resistance of each group of heating wires are immediately checked, the concrete is cured after being laid, and after the curing period is over, the nominal resistance and the insulation resistance of the carbon fiber heating wires are checked again;
paving and compacting the asphalt concrete: paving and compacting the asphalt concrete according to the design requirements, and after the curing period is over, carrying out a power-on heating test for 48 hours;
installing an intelligent temperature control system: drilling a hole with the depth of 2cm on the carbon fiber heating bridge surface, wherein the position of the hole is preferably located at the center of a heating area as much as possible, and fixing a sensing end of a temperature sensor in the hole; in addition, a wire groove capable of laying a signal transmission line of a temperature sensor is formed in the bridge floor, the output end of the temperature sensor is led out of the bridge floor to be connected with a temperature controller, and the wire groove is sealed by asphalt mortar; the output end of the temperature controller is connected with an alternating current contactor.
2. The process for constructing the sealing material for the snow and ice melting of the bridge deck as claimed in claim 1, wherein the carbon fiber heating wires are laid and fixed on the side surfaces or the bottom of the reinforcing mesh in a U-shaped orientation.
3. The process for constructing a seal material suitable for snow melting and deicing of bridge decks according to claim 1, wherein the cement concrete is vibrated by a surface vibrator.
4. The construction process of the seal material suitable for snow melting and deicing of the bridge deck as claimed in claim 1, wherein the paving speed of the paver is 2-3m/min, the vibration frequency of a ram of the paver is 550-650r/min, and the paving temperature is not lower than 100 ℃.
5. The process for constructing a sealing material suitable for removing ice and snow from bridge floors as claimed in claim 1, wherein the power line connector is installed in a junction box, and the power line passing through the hole must be sleeved in the protective tube.
6. The process for constructing the seal material suitable for snow melting and deicing of the bridge deck as claimed in claim 1, wherein the power supply voltage is 200V-230V.
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| CN116254734A (en) * | 2023-01-09 | 2023-06-13 | 河南大学 | A high-performance snow-melting and ice-melting concrete pavement and its manufacturing method |
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