CN111962675A - Construction method of large-span special-shaped cast-in-place reinforced concrete open-web truss - Google Patents
Construction method of large-span special-shaped cast-in-place reinforced concrete open-web truss Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
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- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
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- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor
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- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
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Abstract
The invention discloses a construction method of a large-span special-shaped cast-in-place reinforced concrete open-web truss, which aims to solve the technical problems that the special-shaped cast-in-place reinforced concrete open-web truss structure is low in construction efficiency and the construction quality is difficult to guarantee. Which comprises the following steps: (1) erecting a support system; (2) erecting a lower chord beam template, binding lower chord beam steel bars and pouring lower chord beam concrete; (3) erecting the upper chord beam, the upright post and the floor slab template, binding the steel bars and pouring concrete. The invention adopts the construction process of 'twice formwork supporting and twice concrete pouring', ensures the construction quality of the cast-in-place concrete open-web truss, effectively improves the construction efficiency and the engineering quality, and obtains good economic and social benefits.
Description
Technical Field
The invention relates to the technical field of hollow truss construction, in particular to a construction method of a large-span special-shaped cast-in-place reinforced concrete hollow truss.
Background
With the development of modern high-rise and super high-rise buildings towards multifunctional comprehensive use, the arrangement of conversion layers on floors with changed vertical structures becomes the development trend of modern high-rise building structures due to the requirements of bottoms of buildings or local large spaces of some floors and large-span roofs.
Traditional beam type and plate type conversion layers and cross beams and multi-ribbed beam structures are designed to increase the cross section of the beam when pursuing large span and large space, so that the phenomenon of 'strong beam and weak column' is easily caused, the structure is unfavorable for earthquake resistance, and the space effect is not ideal.
At present, the open web truss structure is increasingly applied to conversion layers and roofs of high-rise buildings and other large-span buildings requiring wide space due to the characteristics of reasonable structural stress, strong integrity, good rigidity and no limitation of space and span, and the special-shaped cast-in-place reinforced concrete open web truss structure has low construction efficiency and difficult guarantee of construction quality.
Disclosure of Invention
The invention aims to solve the technical problems that a construction method of a large-span special-shaped cast-in-place reinforced concrete open-web truss is provided, and the technical problems that the construction efficiency of a special-shaped cast-in-place reinforced concrete open-web truss structure is low and the construction quality is difficult to guarantee are solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a construction method for designing a large-span special-shaped cast-in-place reinforced concrete open-web truss comprises the following steps:
(1) erecting a support system, then erecting a lower chord beam template, binding lower chord beam reinforcing steel bars by combining the stress characteristics of the hollow truss in a mode of synchronously inwards pushing four corners, firstly shortening and then lengthening, firstly binding a frame beam and then binding a secondary beam, and then pouring concrete into the lower chord beam template;
(2) the upper chord beam is bound with upper chord beam reinforcing steel bars in a mode that four corners are synchronously pushed inwards, the upper chord beam is firstly short and then long, and a frame beam is bound firstly and then a secondary beam is bound; manufacturing a stand column template and an upper chord beam template through BIM deepening design, and firmly assembling and installing the stand column template and the upper chord beam template; the floor slab template is laid in a mode of 'one laying at intervals' of an open web truss grid, and then concrete is poured in layers from the middle to two sides.
Preferably, in the step (1), a full scaffold is adopted as the support system.
Preferably, in the step (1), the steel bars are bound, so that the binding number and the spacing between the main bars and the stirrups are ensured.
Preferably, in the step (1), the concrete is poured in a pumping mode, the concrete is poured from the middle to two sides, and the concrete is continuously supplied during the pouring.
Preferably, in the step (2), the BIM deepening design is to create a BIM three-dimensional model of a rectangular column, a square column and a cross column of the upper chord beam according to the section types of the column and the upper chord beam.
Preferably, in the step (2), according to the prepared upright post template and the upper chord beam template, a double-splayed upright post internal corner template and a beam bottom upright post haunch C-shaped combined template are manufactured, and the manufactured different C-shaped combined templates and the double-splayed upright post internal corner template are combined and firmly installed.
Preferably, the manufacturing method of the C-shaped combined template is as follows: according to different dimensions of the hollow grid upright columns and the upper chord beam haunches, the C-shaped combined template is decomposed into a beam bottom flat template and upright column haunches on two sides, and then the beam bottom flat template and upright column haunches on two sides are combined to obtain the composite material.
Preferably, in the step (2), before the floor slab template is laid, an empty stomach truss integral BIM model is created, the floor slab template scheme is optimized, and the template is determined to be laid in a 'one-by-one' manner.
Preferably, in the step (2), after the upper chord beam template is bound by the steel bars, the upper chord beam side template and the roof panel template are closed, and the roof panel steel bars are bound.
Preferably, in the step (2), before the concrete is poured, a short steel pipe is inserted into the column formwork to be used as a mark, and the steel pipe is pulled out at each pouring vibration position.
Preferably, in the vibrating process, the vibrating rods are uniformly pulled up and down, and vibrating is carried out by a staggered or parallel construction method, wherein the vibrating time at each point is 20-30 s.
The process principle of the invention is as follows:
the open web truss is composed of web members (upright posts), upper chords (beams) and lower chords (beams), and has few members meeting at nodes, but the stress is complex, and the members bear bending moment and shearing force besides axial force. Therefore, in construction, a hollow truss and the like are replaced by a solid web girder according to the principle of rigidity equivalence for calculation and analysis, structural construction control key points are determined through finite element static analysis, a BIM technology is utilized to carry out three-dimensional deepening design on the template aiming at the construction difficulty of the special-shaped hollow truss upright column and the upper chord girder, and the erecting forms of the upright column template and the upper chord girder template are determined; laying the templates according to a mode of 'laying one on another' of the hollow truss grids; the reinforcement binding adopts a mode of synchronously pushing four corners inwards, firstly binding a frame beam, and then binding a secondary beam and a floor slab reinforcement; the concrete pouring adopts a construction process of 'twice formwork supporting and twice pouring', so that the construction quality of the cast-in-place reinforced concrete open-web truss is ensured. The whole process is scientific, reasonable, economical, practical, precise in structure, exquisite in manufacture and excellent in engineering construction quality at one time.
Compared with the prior art, the invention has the main beneficial technical effects that:
1. the open-web truss is composed of web members (upright posts), upper chords (beams) and lower chords (beams), has reasonable structure, clear stress, strong integrity and good rigidity, can well meet the requirements of large span and large space, has strong workability and economy, and meets the requirements of green construction and development.
2. The invention utilizes BIM technology to carry out optimization design aiming at the construction difficulty of the special-shaped cast-in-place reinforced concrete open web truss upright post and the upper chord beam template, and manufactures the double-splayed upright post internal corner template and the C-shaped combined template, realizes the assembly construction of the upright post and the upper chord beam template, has high construction speed and high work efficiency, can shorten the construction period, and improves the economic benefit.
3. According to the invention, the large-area cast-in-place reinforced concrete hollow truss floor slab template is laid by the BIM technology to optimize the scheme, and according to the construction method of 'one laying at intervals' of the hollow truss grids, the laying construction efficiency of the stand columns and the floor slab template is improved, and the construction progress is accelerated.
4. On the basis of finite element static calculation of the structure, the invention provides a concrete pouring process of twice formwork supporting and twice pouring of the special-shaped hollow truss, and ensures the integral construction quality of the hollow truss. The whole process is scientific, reasonable, economical, practical, precise in structure, exquisite in manufacture and excellent in engineering construction quality at one time.
Drawings
FIG. 1 is a flow chart of the construction process of the large-span special-shaped cast-in-place reinforced concrete open-web truss.
FIG. 2 is a line diagram of the binding of the lower chord beam of the large-span special-shaped cast-in-place reinforced concrete open web truss.
FIG. 3 is a sectional view of the specially-shaped variable cross-section cast-in-place reinforced concrete open web truss of the present invention.
Fig. 4 is a schematic view of a first concrete pouring position of the open web truss girder according to the present invention.
FIG. 5 is a BIM model diagram of the rectangular column of the special-shaped open web truss of the present invention.
FIG. 6 is a BIM model diagram of the profiled hollow truss square column according to the present invention.
FIG. 7 is a BIM model diagram of the cross-shaped vertical column of the special-shaped open web truss according to the present invention.
Fig. 8 is a schematic diagram of a Building Information Modeling (BIM) model for constructing floor slabs by laying one slab at intervals.
Fig. 9 is a schematic view of concrete pouring (second pouring) of the upper chord beam and the upright post according to the invention.
In the figure, 1 is a first binding, 2 is a second binding, 3 is a third binding, 4 is an upper chord beam, 5 is an upright post, 6 is concrete first pouring, 7 is a lower chord beam, 9 is a hollow truss section, 10 is a rectangular upright post BIM model, 11 is a square upright post BIM model, 12 is a cross upright post BIM model, 13 is a floor slab first laying construction BIM model, and 14 is concrete second pouring.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
The first embodiment is as follows: the construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss is shown in figure 1 and comprises the following steps:
1. support system erection
(1) Horizontal rod arrangement
1) The longitudinal horizontal rod is arranged at the inner side of the vertical rod, and the length of a single rod is not less than 3 spans;
2) the longitudinal horizontal rods are connected or overlapped by adopting butt fasteners, and the following regulations are met:
joints of two adjacent longitudinal horizontal rods are not required to be arranged in a synchronous or same span; the staggered distance in the horizontal direction between two adjacent joints which are not synchronous or different is not less than 500 mm; the distance from the center of each joint to the nearest main node is not greater than 1/3 of the longitudinal distance;
secondly, the lapping length is not less than 1m, 3 rotating fasteners are arranged at equal intervals for fixing, and the distance from the edge of the cover plate of the end fastener to the end of the lapping longitudinal horizontal rod is not less than 100 mm;
3) all the rod pieces are firmly propped against the top of the wall columns around the building or are connected with the structure at the end parts of the structure columns which are additionally provided with horizontal hoops for firmly hooping the horizontal rods, so that the rigidity of the whole supporting system is enhanced.
(2) Upright pole arrangement
1) A template skid is arranged below the vertical rod of the bracket;
2) the supporting frame must be provided with a longitudinal and a transverse floor sweeping rods; the longitudinal floor sweeping rod is fixed on the vertical rod which is not more than 200mm away from the base epithelium by adopting a right-angle fastener; the transverse sweeping rod is fixed on the vertical rod which is close to the lower part of the longitudinal sweeping rod by adopting a right-angle fastener;
3) when the upright stanchions of the support frames are not at the same height, the longitudinal floor sweeping poles at the high position need to be extended to the low position for two spans to be fixed with the upright stanchions, and the height difference is not more than 1 m; the distance from the axis of the upright rod above the side slope to the side slope is not less than 500 mm;
4) the butt joint and the lap joint of the upright rods of the support frame meet the following regulations:
firstly, when the vertical rods are in butt joint for long, butt joint fasteners of the vertical rods are arranged in a staggered mode, joints of two adjacent vertical rods are not arranged in a synchronous mode, and the staggered distance of two separated joints of one vertical rod in the synchronous mode in the height direction is not smaller than 500 mm; 1/3, the distance from the center of each joint to the main node is not more than the step distance;
secondly, when the vertical rod is in lap joint for long time, the lap joint length is not less than 1m, and at least 2 rotating and fastening pieces are adopted for fixing; the edge to bar end distance of the end fastener cover plate should not be less than 100 mm.
(3) Fastening piece
1) The opening of the butt-joint fastener is upward or inward, and the bolt directions of the fasteners are consistent as much as possible;
2) the tightening torque of the fastener bolt is controlled to be 45-60 N.M;
3) the mutual distance between the central points of the right-angle fasteners and the rotating fasteners used for the longitudinal and transverse horizontal rods, the cross braces, the transverse diagonal braces and the like at the main node is not more than 150 mm.
(4) Scissor brace arrangement
1) The scissor supports must be added in time along with the increasing of the erecting height of the frame, and the scissor supports must be continuously arranged to the top without a gap, and the bottoms of the inclined rods must fall on the base plate;
2) the cross braces are erected by steel pipes which accord with the actual length, the included angles of the cross braces and the floor are 45-60 degrees, the cross braces and the floor are continuously arranged from bottom to top along the periphery of the high support, the lap joints are lapped by right-angle fasteners, the lap joint length is not less than 1000 mm, and the lap joint fasteners are not less than three cross braces and vertical rods, and the joints are firmly buckled by rotary fasteners and vertical rods.
(5) Wall connecting piece device
1) The distance from the main node should not be more than 300 mm;
2) starting to arrange from the longitudinal horizontal rod in the first step of the bottom layer, and adopting other reliable measures to fix when the longitudinal horizontal rod is difficult to arrange;
3) preferably, a diamond arrangement, or a square, rectangular arrangement is used.
(6) Formwork support
1) The joints of the vertical rods and the horizontal rods are arranged in different frame layers in a staggered manner;
2) the vertical deviation of the vertical rods and the horizontal deviation of the cross rods are ensured to meet the requirements of the technical safety standard of fastener type steel pipe support frames for building construction (JGJ 130-2011);
3) the quality of each fastener and the steel pipe is ensured to meet the requirements, the tightening torque of each fastener is controlled to be 45-60 N.m, and the steel pipe cannot be deformed after long-term use.
2. Lower chord beam formwork erection
(1) The template installation must guarantee the position is accurate and correct, the template has tight joints, the supporting system is firm and reliable, do not deform and displace;
(2) the verticality, elevation, pre-embedding and reserved hole positions of the template must meet requirements;
(3) the allowable deviation of the cast-in-place structure template must meet the acceptance criteria of construction quality of concrete structure engineering (GB 50204-2015).
3. Binding of lower chord beam steel bar
(1) The binding of the reinforcing steel bars ensures the binding number and the binding distance of the main reinforcements and the stirrups, and the reinforcing steel bars cannot be leaked;
(2) the lower chord beam steel bars are bound according to the arrangement form and the acceptance characteristics, the mode that four corners are synchronous, the length is increased after the length is shortened, and the frame beam is bound before the secondary beam is bound is adopted, so that the stress balance of the support frame body is ensured, and the construction efficiency is improved; the lower chord beam lashing line is shown in fig. 2.
4. Concrete pouring of bottom chord beam (first pouring)
(1) A calculation model of the hollow truss is established by utilizing SAP2000 software, finite element stress analysis is carried out, the fact that the upright post transmits axial force and bending moment and shearing force in the hollow truss structure is obtained, the bending moment and the shearing force borne by the upright post during spanning are minimum, and the internal force is maximum when the upright post is close to a support. Therefore, when the hollow truss is erected, the measures of haunching the upper end and the lower end of the upright column and increasing the section size of the upper chord beam and the lower chord beam are adopted, and the shearing resistance of the structure is improved. The space design of the common grids of the hollow truss is smaller, and the limitation of measures such as the height of the upright post and the haunching and the like causes that the one-time construction difficulty of the erection of the lower chord beam, the upright post and the upper chord beam template, the reinforcement and the erection of the frame body is large, the concrete pouring quality at the bottom of the lower chord beam and the upright post cannot be ensured, and the great quality safety hidden danger exists. Therefore, according to the stress characteristics of finite element analysis and the convenience of construction, a method of 'formwork erecting twice and pouring twice' is adopted. The construction method comprises the following steps of dividing the lower chord beam, the upright post, the upper chord beam and the floor slab into two construction steps, wherein the lower chord beam is constructed for the first time, and the upright post, the upper chord beam and the floor slab are constructed for the second time. The sectional view and the construction by times of the special-shaped cast-in-place reinforced concrete open-web truss are shown in figures 3 and 4.
(2) The main point of the quality control of the concrete pouring
1) The concrete needs to be continuously supplied during pouring, and the time from a commercial concrete mixing plant to on-site mould entering is not more than 90 min;
2) concrete pouring is carried out in a pumping mode;
3) when the reinforcing steel bars of the beam-column joints are dense, the vibration is strengthened by adopting a small-diameter vibrating rod.
5. Erecting and reinforcing steel bar binding of upper chord beam, upright post and floor slab (roof) template
(1) And (3) according to the types of the special-shaped hollow truss upright post and the upper chord beam, creating a BIM three-dimensional model of the rectangular, square and cross upright post, as shown in figures 5-7. According to the BIM model, the deepening design is carried out on the special-shaped upright post and the bottom template of the upper chord beam, the BIM deepening design is that according to the section types of the upright post and the upper chord beam, Revit software is adopted to create three-dimensional models of a rectangular upright post, a square upright post and a cross-shaped upright post of the upper chord beam, a double-splayed upright post internal corner template and a beam bottom upright post haunch C-shaped combined template are manufactured, and the assembly construction of the upright post and the upper chord beam template is realized.
(2) Manufacturing of bottom template of upright post and upper chord beam
Manufacturing a C-shaped combined template: according to the sizes of different open web grid columns, upper chord beams and haunched columns, the C-shaped section mould combined template is decomposed into a beam bottom flat mould and upright column haunched U-shaped templates at two sides, and then the beam bottom flat mould and upright column haunched U-shaped templates are combined.
(3) And manufacturing a double-splayed template of the internal corner of the upright post according to the BIM model. And combining and firmly installing the manufactured different C-shaped combined templates and the double-splayed-shaped upright post internal corner templates.
(4) According to the structural characteristics of the hollow truss, a BIM technology is utilized to create a hollow truss integral model, floor (roof) template scheme optimization is carried out, a lower part construction space is reserved for facilitating construction of the upright posts and the upper chord beam templates, and grid construction is carried out according to a method of 'laying one on one at intervals' of a hollow truss grid, so that the construction efficiency and the construction quality are improved. The floor (roof) formwork constructs the BIM model, as shown in figure 8.
(5) Steel bar binding for upper chord beam and floor (roof)
And binding the upper chord beam steel bars according to the binding sequence and requirements of the lower chord beam steel bars. And after the upper chord beam reinforcing steel bars are bound, closing the upper chord beam side template and the roof panel template, and binding the roof panel reinforcing steel bars.
6. Concrete pouring of upper chord beam and upright column (second pouring)
And binding the upright posts, the upper chord beams, the floor slab (roof) template and the steel bars, and performing secondary pouring of concrete after the binding is qualified, wherein the pouring positions are shown in figure 9.
Because the area of the hollow truss floor (roof) is large, the area paved by continuously pouring concrete is large, and the leakage vibration of the upper chord beam and the upright column is easy to cause, in order to avoid the phenomenon, a short steel pipe (the steel pipe must be exposed out of the roof) is inserted into the upright column as a mark before the concrete is poured, and the steel pipe is pulled out at each pouring vibration position, so that the 100 percent vibration of the upright column is ensured.
The operation of the vibrating spear needs to realize 'fast insertion and slow drawing', the vibrating spear is easy to be uniformly drawn up and down in the vibrating process, the vibrating is carried out by using 'staggered' or 'parallel', the vibrating time at each point is preferably 20-30s, the concrete surface is considered to be horizontal and does not obviously sink any more, and no bubble appears to overflow from the surface until the occurrence of slurry.
Real-time monitoring is carried out in the concrete pouring process, and generally, the monitoring frequency is not more than 20-30 minutes once. Real-time monitoring is also implemented before and after initial setting and before and after final setting of the concrete, and monitoring time can be adjusted according to actual conditions on site. The monitoring time is controlled from the high formwork using time to the final setting of the concrete.
7. Concrete curing
The maintenance is carried out by adopting a mode of watering maintenance and covering a plastic film; the curing time of the concrete is not less than 7 d; regularly watering the film to keep the concrete in a wet state all the time; and controlling and measuring the temperature difference between the inside and the outside of the concrete.
8. Form and support system removal
And (4) after the test of the curing test block under the same condition, when the strength of the concrete is confirmed to reach the form removal strength, the curing test block can be detached so as to prevent collapse accidents.
The large-span special-shaped cast-in-place reinforced concrete open web truss not only needs to execute the acceptance criteria of construction quality of concrete structure engineering (GB 50204-2015) but also meets the requirements of national, industrial and local standards and specifications such as the technical safety criteria of building construction templates (JGJ162-2008) and the technical safety criteria of fastener type steel pipe supports for building construction (JGJ 130-2011). The technical requirements for the erection of the support frame body, the allowable deviation and the inspection method meet the requirements of the following table 1.
TABLE 1 support frame set tolerance (mm)
The allowable deviation of the formwork installation shall be in accordance with the following table 2.
TABLE 2 tolerance to template installation
In the construction, the BIM technology is utilized to carry out optimization design aiming at the construction difficulty of the special-shaped cast-in-place reinforced concrete open-web truss upright post and the upper chord beam template, so that a double-splayed upright post internal corner template and a C-shaped combined template are manufactured, and the assembly construction of the upright post and the upper chord beam template is realized; meanwhile, the scheme of laying a large-area cast-in-place reinforced concrete hollow truss floor slab template is optimized through the BIM technology, and according to the construction method of 'laying one at a time' of a hollow truss grid, the laying construction efficiency of the stand column and the floor slab template is improved, the construction speed is high, the working efficiency is high, the construction period can be effectively shortened, and the economic and social benefits are remarkable. The construction process is reasonable, the construction quality of the cast-in-place reinforced concrete open-web truss is ensured, the whole process is economical and applicable, the structure is precise, the manufacture is exquisite, the space after molding is attractive in appearance, and the engineering construction quality is excellent at one time. The construction technology of the special-shaped cast-in-place reinforced concrete open-web truss solves the problems of the large-span column-free space in the design and construction process, has excellent construction quality at one time, meets the requirements of users, saves resources, and meets the national green development requirements.
In conclusion, according to the structural characteristics and construction difficulty of the hollow truss, the invention carries out technical research on the construction process of the special-shaped cast-in-place reinforced concrete hollow truss, ensures the construction quality of the cast-in-place concrete hollow truss by finite element calculation and analysis, utilizing BIM technology to carry out deepened design and adopting the construction process of 'twice formwork supporting and twice concrete pouring', effectively improves the construction efficiency and the engineering quality and obtains good economic and social benefits.
The invention is explained in detail above with reference to the drawings and the embodiments; however, those skilled in the art will understand that various changes in the above embodiments, or equivalent substitutions of related parts, structures and materials, may be made without departing from the spirit of the invention, thereby forming a plurality of embodiments, which are common variations of the invention and will not be described in detail herein.
Claims (10)
1. A construction method of a large-span special-shaped cast-in-place reinforced concrete open-web truss is characterized by comprising the following steps:
(1) erecting a support system, erecting a lower chord beam template, binding lower chord beam reinforcing steel bars by combining the stress characteristics of the hollow truss in a mode that four corners are synchronously pushed inwards, a frame beam is bound firstly and a secondary beam is bound secondly, and then pouring the lower chord beam by using concrete;
(2) the upper chord beam is bound with upper chord beam reinforcing steel bars in a mode that four corners are synchronously pushed inwards, the upper chord beam is firstly short and then long, and a frame beam is bound firstly and then a secondary beam is bound; manufacturing a stand column template and an upper chord beam template through BIM deepening design, and firmly assembling and installing the stand column template and the upper chord beam template; the floor slab template is laid in a mode of 'one laying at intervals' of an open web truss grid, and then concrete is poured in layers from the middle to two sides.
2. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss according to the claim 1, wherein in the step (1), a full scaffold is adopted as a supporting system.
3. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss according to claim 1, wherein in the step (1), the binding of the steel bars ensures the binding number and the spacing of the main bars and the stirrups.
4. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss as claimed in claim 1, wherein in the step (1), the concrete is poured in a pumping mode from the middle to two sides, and the concrete is continuously supplied during the pouring.
5. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss as claimed in claim 1, wherein in the step (2), the BIM deepening design is to create BIM three-dimensional models of rectangular columns, square columns and cross columns of the upper chord beams according to the section types of the columns and the upper chord beams.
6. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss as claimed in claim 1, wherein in the step (2), according to the manufactured upright post template and the upper chord beam template, a double-splayed upright post internal corner template and a beam bottom upright post haunch C-shaped combined template are manufactured, and the manufactured different C-shaped combined templates and the double-splayed upright post internal corner template are combined and firmly installed.
7. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss as claimed in claim 6, wherein the manufacturing method of the C-shaped combined template is as follows: according to different dimensions of the hollow grid upright columns and the upper chord beam haunches, the C-shaped combined template is decomposed into a beam bottom flat template and upright column haunches on two sides, and then the beam bottom flat template and upright column haunches on two sides are combined to obtain the composite material.
8. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss according to the claim 1, characterized in that in the step (2), before the floor slab template is laid, an integral BIM model of the open-web truss is created, the floor slab template scheme is optimized, and the templates are determined to be laid in a 'one-by-one' manner.
9. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss according to the claim 1, wherein in the step (2), after the upper chord beam template is bound by the steel bars, the upper chord beam side template and the roof panel template are closed, and the roof panel steel bars are bound.
10. The construction method of the large-span special-shaped cast-in-place reinforced concrete open-web truss as claimed in claim 1, wherein in the step (2), before the concrete is poured, short steel pipes are inserted into the column formworks as marks, and the steel pipes are pulled out at each pouring vibration position.
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