Cantilever cast-in-place continuous beam combined type precise positioning construction method based on BIM technology

Abstract

The invention discloses a cantilever cast-in-place continuous beam combined type precise positioning construction method based on a BIM technology, and belongs to the technical field of road construction. Comprising the steps of construction preparation, CAD and BIM simulation optimization, hanging basket assembling and pre-pressing, bottom plate and web steel bar binding, prestressed pipeline installation, inner formwork and top formwork installation, top plate steel bar binding and prestressed pipeline installation, concrete pouring, checking, cleaning and maintenance, prestress tensioning and mud jacking, hanging basket dismantling and hanging bracket installation and closure section construction. Construction of the next stage of descending and sliding of the hanging basket, prefabricating and positioning of positioning clamping strips, prefabricating and positioning of a total-section combined type net-shaped framework, prefabricating of a formwork and reserving of vibration hole sites; when continuous beam cantilever casting is carried out, the detachable combined type steel bar framework is used for controlling the layer distance of the bottom plate steel bars, and it is ensured that in the construction process of workers, it is avoided that the top layer steel bars of the bottom plate deform or sink or move due to loads of people and machines.

Description

Technical Field

[0001] The present invention belongs to the technical field of road construction, and in particular relates to a combined precise positioning construction method of a cantilever cast-in-place continuous beam based on BIM technology. Background Art

[0002] At present, with the rapid development of transportation engineering construction, cast-in-place prestressed concrete continuous beams have been widely used in bridge construction. The cantilever casting method of the hanging basket overcomes the difficulties of high altitude, large span, and complex surrounding construction environment in the construction of continuous beams, and simplifies the construction process of continuous beams.

[0003] However, in the existing cantilever casting construction, quality defects such as uneven concrete feeding near the pier top support, local voids, missing reinforcement, inaccurate positioning of anchor plates and prestressed pipes often occur, which seriously affect the durability and service life of the continuous beam structure and increase the danger of the bridge structure. Therefore, a combined precise positioning construction method for cantilever cast-in-place continuous beams based on BIM technology is needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a cantilever cast-in-place continuous beam combined precise positioning construction method based on BIM technology to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a method for the combined precise positioning construction of cantilever cast-in-place continuous beams based on BIM technology, including construction preparation, CAD and BIM simulation optimization, hanging basket assembly and preloading, bottom plate and web steel bar binding, prestressed pipe installation, inner mold and top mold installation, top plate steel bar binding and prestressed pipe installation, concrete pouring, inspection, cleaning and maintenance, prestressed tensioning and grouting, hanging basket removal and hanger installation, closing section construction, hanging basket descent and sliding next stage construction, positioning card strip prefabrication and positioning, full-section combined mesh skeleton prefabrication and positioning, template prefabrication and reserved vibration hole positions. When performing the CAD and BIM simulation optimization operations, CAD and BIM software need to be used for simulation optimization, and collision inspection and optimization are performed on the positions of the steel bars and prestressed pipes of the continuous beam section 0 and the cantilever section, and the top plate steel bar binding and the installation of the prestressed pipes and anchor pads are performed with the optimized data;

[0006] The specific operation of the hanging basket assembly and preloading is as follows: after the hanging basket structural components are transported to the construction site, they are lifted to the top surface of the poured beam section by a tower crane or a crane, and assembled on the top surface of the poured No. 0 beam section. After the assembly is completed, the beam section load is applied to the hanging basket for preloading to fully eliminate the inelastic deformation caused by the hanging basket. During the construction process, the elastic deformation of the hanging basket is included in the calculation of the pre-camber of the beam section construction;

[0007] The specific operation of the bottom plate and web reinforcement binding is as follows: before positioning, two transverse horizontal reinforcements are installed according to the length of the angle steel strip, and then the angle steel strip and the two transverse horizontal reinforcements are fixed by binding wire, and then the remaining transverse horizontal reinforcements are installed, and the angle steel strip is removed after the binding is completed; when the longitudinal horizontal reinforcements are bound, the two sides are fixed with reinforcement strips, and the middle through-mould reinforcement is positioned with the end steel template of the slot to be clamped, and the three are connected by the back rib channel steel. When installing the reinforcement, the reinforcement only needs to be placed in the angle steel slot to achieve accurate positioning of the reinforcement;

[0008] The installation of the prestressed pipe adopts the method of first making a full-section combined mesh frame and accurately positioning and installing it, and then installing the prestressed pipe to carry out the installation construction of the bottom plate and web prestressed pipe;

[0009] The specific operation of installing the inner mold and the top mold is: after the bottom plate web reinforcement is tied and the prestressed pipe is installed and fixed, the box beam inner mold and the top mold are installed, and the top plate end template and the steel anchor box are installed;

[0010] The specific operation of the inspection, cleaning and maintenance is as follows: automatic spraying maintenance is carried out after the concrete pouring is completed, and the maintenance time and interval can be reasonably adjusted according to the actual site environment;

[0011] After the concrete reaches the design strength, elastic modulus and age requirements, the prestressing and grouting operations of the beam body are carried out;

[0012] The specific operation of removing the hanging basket and installing the hanger is as follows: after the prestressing and grouting are completed, the hanging basket is lowered and moved forward, and then the cantilever section is constructed repeatedly until the joint section is reached, after which the hanging basket is moved backward and removed, and the joint section hanger is installed to prepare for the joint section construction.

[0013] By setting up the above structure, the construction method is mainly suitable for the precise positioning and installation of steel bars, prestressed pipes and anchor plates in the cantilever casting construction of continuous beams, and can also be used for the precise positioning construction of integral support cast-in-place continuous beams and simply supported beam structures.

[0014] As a preferred solution, the specific operations of the construction preparation are: complete the review of design drawings and design technical briefing, and review and approval of construction plans and special technical measures before construction; the data from on-site inspections and measurements should be recorded and signed in a special record book in a timely manner, and the data information should be true, complete, accurate and clear; incoming materials must have a quality guarantee and be subject to random inspections and tests as required; materials and construction machinery should be classified and stored as required, with clear labels to prevent damage and contamination.

[0015] As a preferred solution, when tying the bottom plate and web reinforcement, 63mm equilateral angle steel is used to make reinforcement strips before tying the transverse horizontal reinforcement. The size and spacing of the strip slots are precisely prefabricated in the factory according to the optimized drawing data, and the slot width is 2mm larger than the steel bar diameter. The strip is generally 2m long and is placed at each end of the transverse horizontal reinforcement.

[0016] As a preferred solution, in the installation of the prestressed pipe, the full-section combined mesh skeleton is processed into an integral mesh by using φ10 steel bars in three parts: bottom plate, web plate and top plate according to the relative position of the prestressed pipe in each section. During processing, the gap between the steel bars and the pipe on each side is controlled to be ≤2mm; the spatial coordinates of the prestressed pipe in each section are collected through BIM technology, and the overall crisscross frame of each section is manufactured according to the coordinates; the end mold, side mold and top plate are used as the reference surface for positioning the pipe, the crisscross frame is accurately positioned and welded and fixed to the steel skeleton, and the pipe is inserted from the corresponding position of the crisscross frame to realize precise installation of the pipe, thereby ensuring that the prestressed tensioning force meets the design requirements.

[0017] As a preferred solution, in the installation of the inner mold and the top mold, the anchor box is precisely processed by the steel plate factory, and the anchor box and the end mold and the anchor box and the anchor plate are tightly fixed with bolts, so that the anchor plate, the anchor groove and the end mold form a whole. When the end mold is installed, the position and verticality are accurate, which can ensure that the pipeline is vertical to the anchor plate, and ensure that the concrete quality of the prestressed tensioning end anchor hole and the prestress loss of the bell mouth meet the design requirements.

[0018] As a preferred solution, the steel bar binding and prestressed pipe installation on the top plate are consistent with the construction methods of the lower base plate and web, and require strict construction with the help of BIM optimized drawings. The steel bars are positioned with positioning strips and end molds with slots, and the prestressed pipes are positioned and installed with a combined mesh skeleton.

[0019] As a preferred solution, when pouring the concrete after the mold is closed, the pouring and vibration hole positions of the continuous beam are optimized with the help of BIM visual simulation technology. By arranging reserved vibration channels in the steel-dense areas such as the bottom plate and top plate of the cantilever section, and reserving vibration windows in the widened web area, manhole and other parts, the problem of insufficient vibration in the steel-dense areas of the cantilever section is solved, thereby ensuring the density of the concrete in the hidden parts.

[0020] As a preferred solution, the specific operations of the joint section construction are as follows: pre-compression is carried out on both sides of the joint section in advance, the reserved length of the prestressed pipes on both sides is controlled to be no less than 30 cm, the middle pipe is embedded and connected with the pipes on both sides and sealed with tape, and the mesh skeleton is densely arranged at a spacing of 30 cm, which avoids the problem of sinking of the pipe in the joint section due to concrete vibration and detachment of the interface, and ensures that the linear shape of the prestressed pipe in the joint section and the pipe space are closed and leak-proof.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention uses a detachable combined steel bar skeleton to control the distance between the steel bars of the bottom plate when casting the cantilever of the continuous beam, thereby ensuring that the top steel bars of the bottom plate will not be deformed or sink or shift due to the load of people and machines during the construction process.

[0023] The present invention adopts a full-section mesh frame to connect all the prestressed pipe positioning ribs into a whole, and the construction personnel can realize accurate positioning by passing the prestressed pipe through the corresponding positioning hole, thereby avoiding the inaccurate installation position of the pipe caused by human factors;

[0024] In the present invention, the end formwork of the cantilever casting continuous beam adopts a steel formwork, the end formwork is rigidly bolted to the steel anchor box, and the full-section mesh skeleton is spot-welded to the structural steel bars at multiple locations, which effectively ensures that the anchor plate and the prestressed pipe will not be deformed or dislocated during the concrete pouring process;

[0025] The present invention uses steel bar positioning clips, end steel templates with slots, steel anchor boxes and other tools that are all processed in factories with high processing accuracy, so that construction personnel only need to install positioning clips and other tools to achieve accurate positioning of steel bars and other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a construction operation flow chart of the present invention;

[0027] Figure 2 It is a schematic diagram of the steel bar positioning clip and end mold structure of the present invention.

[0028] In the figure: 1. Construction preparation; 2. CAD and BIM simulation optimization; 3. Hanging basket assembly and prestressing; 4. Bottom plate and web reinforcement binding; 5. Prestressed pipe installation; 6. Inner formwork and top formwork installation; 7. Top plate reinforcement binding and prestressed pipe installation; 8. Concrete pouring; 9. Inspection, cleaning and maintenance; 10. Prestressed tensioning and grouting; 11. Hanging basket removal and hanger installation; 12. Closing section construction; 13. Hanging basket descent and sliding to the next stage of construction; 14. Prefabrication and positioning of positioning strips; 15. Prefabrication and positioning of full-section combined mesh skeleton; 16. Formwork prefabrication; 17. Reserved vibration holes; 18. Angle steel strips; 19. End formwork. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the embodiments.

[0030] The following examples are used to illustrate the present invention, but they cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions. Simple improvements to the method of the present invention under the premise of the concept of the present invention belong to the scope of protection claimed in the present invention.

[0031] See also Figure 1-2 The present invention provides a combined precise positioning construction method for cantilever cast-in-place continuous beams based on BIM technology, including construction preparation 1, CAD and BIM simulation optimization 2, hanging basket assembly and pre-pressing 3, bottom plate and web reinforcement binding 4, prestressed pipe installation 5, inner mold and top mold installation 6, top plate reinforcement binding and prestressed pipe installation 7, concrete pouring 8, inspection, cleaning and maintenance 9, prestressed tensioning and grouting 10, hanging basket removal and hanger installation 11, closing section construction 12, hanging basket lowering and sliding next stage construction 13, positioning card strip prefabrication and positioning 1 4. Prefabrication and positioning of the full-section combined mesh skeleton 15, prefabrication of the formwork 16 and reserved vibration holes 17. The specific operations of construction preparation 1 are: complete the review of design drawings and design technical disclosure, and review and approval of construction plans and special technical measures before construction; the data of on-site inspection and measurement should be recorded and signed in a special record book in a timely manner, and the data information should be true, complete, accurate and clear; the incoming materials must have a quality guarantee and be sampled and tested according to regulations; materials and construction machinery and tools should be classified and stored according to regulations, clearly marked to prevent damage and pollution;

[0032] When performing CAD and BIM simulation optimization operations, it is necessary to use CAD and BIM software for simulation optimization, perform collision checks and optimization on the positions of the steel bars and prestressed pipes in the No. 0 section of the continuous beam and the cantilever section, and use the optimized data to tie the top plate steel bars and install the prestressed pipes and anchor pads;

[0033] The specific operation of the hanging basket assembly and preloading 3 is as follows: after the hanging basket structural components are transported to the construction site, they are lifted to the top surface of the poured beam section by a tower crane or a crane, and assembled on the top surface of the poured No. 0 beam section. After the assembly is completed, the beam section load is applied to the hanging basket for preloading to fully eliminate the inelastic deformation caused by the hanging basket. During the construction process, the elastic deformation of the hanging basket is included in the calculation of the pre-camber of the beam section construction;

[0034] The specific operation of the bottom plate and web reinforcement binding 4 is as follows: before positioning, two transverse horizontal reinforcements are installed according to the length of the angle steel clip 18, and then the angle steel clip 18 and the two transverse horizontal reinforcements are fixed by binding wire, and then the remaining transverse horizontal reinforcements are installed. After the binding is completed, the angle steel clip 18 is removed; when the longitudinal horizontal reinforcement is bound, the two sides are fixed with reinforcement clips, and the middle through-mould reinforcement is positioned with the end steel template of the slot to be clamped, and the three are connected by the back rib channel steel. When the reinforcement is installed, it is only necessary to put the reinforcement into the angle steel clip slot to achieve accurate positioning of the reinforcement;

[0035] The prestressed pipe installation 5 adopts the method of first making a full-section combined mesh skeleton and accurately positioning and installing it, and then installing the prestressed pipe to carry out the bottom plate and web prestressed pipe installation 5 construction. In the prestressed pipe installation 5, the full-section combined mesh skeleton is processed into an integral mesh by using φ10 steel bars according to the relative position of the prestressed pipe in each section, and the gap between the steel bars and the pipe on each side is controlled to be ≤2mm during processing; the spatial coordinates of the prestressed pipe in each section are collected through BIM technology, and the overall tic-tac-toe frame of each section is manufactured according to the coordinates; the end mold 19, side mold, and top plate are used as the reference surface for pipe positioning, the tic-tac-toe frame is accurately positioned and welded and fixed to the steel skeleton, and the pipe is inserted from the corresponding position of the tic-tac-toe frame to achieve precise installation of the pipe, ensuring that the prestressed tension meets the design requirements;

[0036] The specific operation of the inner form and top form installation 6 is as follows: after the bottom plate web reinforcement is tied and the prestressed pipe is installed 5 and fixed, the box girder inner form and top form are installed, and the top plate end form and steel anchor box are installed at the same time. In the inner form and top form installation 6, the anchor box is precisely processed by the steel plate factory, and the anchor box and the end form and the anchor box and the anchor pad are tightly fixed with bolts, so that the anchor pad, the anchor groove and the end form form a whole. When the end form 19 is installed, the position and verticality are accurate, which can ensure that the pipeline is vertical to the anchor pad, and ensure that the concrete quality of the prestressed tension end anchor hole and the prestress loss of the bell mouth meet the design requirements;

[0037] The steel bar binding and prestressed pipe installation 5 on the top plate are consistent with the construction methods of the bottom plate and web plate. They need to be strictly constructed with the help of BIM optimized drawings. The steel bars are positioned with positioning strips and end molds with slots 19. The prestressed pipes are positioned and installed with a combined mesh skeleton. The end mold 19 is set as a 10mm thick steel plate end mold 19.

[0038] When pouring concrete after the mold is closed, the BIM visual simulation technology is used to optimize the pouring and vibration hole positions of the continuous beam. By setting reserved vibration channels in the cantilever section bottom plate, top plate and other steel-dense areas, and reserving vibration windows in the web widening area, manholes and other parts, the problem of insufficient vibration in the cantilever section steel-dense areas is solved, thereby ensuring the density of concrete in hidden areas.

[0039] The specific operation of the inspection, cleaning and maintenance 9 is as follows: after the concrete pouring 8 is completed, automatic spraying maintenance construction is carried out. The maintenance time and interval can be reasonably adjusted according to the actual site environment to ensure the wetness of the concrete surface of the cantilever section. Intelligent maintenance can realize unmanned maintenance construction to ensure that the concrete strength meets the design requirements to the greatest extent;

[0040] After the concrete reaches the design strength, elastic modulus and age requirements, the beam body prestressing and grouting operations are carried out 10;

[0041] The specific operation of the hanging basket removal and the hanger installation 11 is as follows: after the prestressing and grouting 10 are completed, the hanging basket is lowered, the hanging basket is moved forward, and then the cantilever section is repeatedly constructed until the joint section is reached, the hanging basket is moved backward and removed, and the joint section hanger is installed to prepare for the joint section construction;

[0042] The specific operation of the joint section construction is as follows: pre-compression is carried out on both sides of the joint section in advance, the reserved length of the prestressed pipes on both sides is controlled to be no less than 30cm, the middle pipe is embedded and connected with the pipes on both sides and sealed with tape, and the mesh skeleton is arranged at a denser interval of 30cm to avoid the problem of sinking of the pipe in the joint section due to concrete vibration and falling off of the interface, ensuring that the linear shape of the prestressed pipe in the joint section and the pipe space are closed and leak-proof.

[0043] The working principle and use process of the present invention are as follows: firstly, the positions of the continuous beam steel bars and prestressed pipes are modeled and optimized using software such as CAD and BIM to avoid conflicts in the structural designs of the steel bars, prestressed pipes, etc., and then the steel bar positioning strips and steel templates with slots, steel anchor boxes, and combined mesh frames are designed using the optimized data, and are put into use after being precisely processed and manufactured in the factory;

[0044] In the bottom plate reinforcement binding of the cantilever part of the continuous beam, a detachable combined reinforcement skeleton is used to control the bottom plate reinforcement layer spacing, and the reinforcement positioning strip and the steel end mold 19 are used to accurately locate the reinforcement spacing of the bottom plate, top plate and web plate;

[0045] Prestressed pipes use a combined mesh frame to connect with the structural reinforcement, and the installation position of the pipe is determined according to the positioning holes through which the positioning reinforcement passes;

[0046] Bolt holes are provided on the anchor plate. During installation, the steel anchor box and the end mold 19, and the steel anchor box and the anchor plate are fixed closely with bolts, so that the anchor plate, the anchor groove, and the steel end mold 19 form a whole, and are fixed to the side mold, and the positioning end mold 19 is used to achieve accurate fixation;

[0047] When pouring the closure section, the two sides and the middle of the prestressed pipe are connected by embedded connection, and the mesh skeleton is arranged at a 300mm interval to ensure the linear connection of the prestressed pipe and the sealing of the space during the construction of the closure section.

[0048] The above-mentioned combined precise positioning technology is used to achieve precise positioning of steel bars, prestressed pipes and anchor plates in the construction of cantilever sections of cast-in-place continuous beams, thereby improving the overall construction quality of cast-in-place continuous beams and achieving fast, efficient and high-quality integrated construction standards.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for the combined precise positioning construction of a cantilever cast-in-place continuous beam based on BIM technology, comprising construction preparation (1), CAD and BIM simulation optimization (2), hanging basket assembly and pre-stressing (3), bottom plate and web reinforcement binding (4), prestressed pipe installation (5), inner mold and top mold installation (6), top plate reinforcement binding and prestressed pipe installation (7), concrete pouring (8), inspection, cleaning and maintenance (9), prestressed tensioning and grouting (10), hanging basket removal and hanger installation (11), closing section construction (12), hanging basket lowering and sliding to the next stage of construction (13), positioning card strip prefabrication and positioning (14), full-section combined mesh skeleton prefabrication and positioning (15), template prefabrication (16) and reserved vibration hole positions (17), characterized in that: When performing the CAD and BIM simulation optimization operations, it is necessary to use CAD and BIM software for simulation optimization, perform collision checks and optimization on the positions of the steel bars and prestressed pipes in the No. 0 section of the continuous beam and the cantilever section, and use the optimized data to perform the top plate steel bar binding and the installation of the prestressed pipes and anchor pads; The specific operation of the hanging basket assembly and preloading (3) is as follows: after the hanging basket structural components are transported to the construction site, they are lifted to the top surface of the poured beam section by a tower crane or a crane, and assembled on the top surface of the poured No. 0 beam section. After the assembly is completed, the beam section load is applied to the hanging basket for preloading to fully eliminate the inelastic deformation caused by the hanging basket. During the construction process, the elastic deformation of the hanging basket is included in the calculation of the pre-camber of the beam section construction; The specific operation of the bottom plate and web reinforcement binding (4) is as follows: before positioning, two transverse horizontal reinforcements are installed according to the length of the angle steel clip (18), and then the angle steel clip (18) and the two transverse horizontal reinforcements are fixed by binding with wire, and then the remaining transverse horizontal reinforcements are installed, and after the binding is completed, the angle steel clip (18) is removed; when the longitudinal horizontal reinforcement is bound, the two sides are fixed with reinforcement clips, and the middle through-mould reinforcement is positioned with the end steel template of the slot to be clamped, and the three are connected by the back rib channel steel, and when the reinforcement is installed, the reinforcement only needs to be placed in the angle steel clip slot to achieve accurate positioning of the reinforcement; The prestressed pipe installation (5) is carried out by first making a full-section combined mesh frame and accurately positioning and installing it, and then installing the prestressed pipe to carry out the bottom plate and web prestressed pipe installation (5) construction; The specific operation of the inner mold and top mold installation (6) is: after the bottom plate web reinforcement binding and prestressed pipe installation (5) are fixed, the box beam inner mold and top mold are installed and the top plate end template and steel anchor box are installed; The specific operation of the inspection, cleaning and maintenance (9) is as follows: after the concrete pouring (8) is completed, automatic spraying maintenance construction is carried out, and the maintenance time and interval can be reasonably adjusted according to the actual site environment; After the concrete reaches the design strength, elastic modulus and age requirements, the prestressing and grouting (10) of the beam body is performed; The specific operation of the removal of the hanging basket and installation of the hanger (11) is as follows: after the prestressing and grouting (10) are completed, the hanging basket is lowered and moved forward, and then the cantilever section is repeatedly constructed until the joint section is reached, after which the hanging basket is moved backward and removed, and the joint section hanger is installed to prepare for the joint section construction.

2. According to the BIM technology-based cantilever cast-in-place continuous beam combined precise positioning construction method of claim 1, it is characterized by: The specific operations of the construction preparation (1) are as follows: before construction, the design drawings shall be reviewed and the design technology shall be disclosed, and the construction plan and special technical measures shall be reviewed and approved; the data of on-site inspection and measurement shall be recorded and signed in a special record book in a timely manner, and the data information shall be true, complete, accurate and clear; incoming materials shall have a quality guarantee certificate and shall be subject to random inspection and testing in accordance with regulations; materials and construction machinery shall be classified and stored in accordance with regulations, clearly marked to prevent damage and contamination.

3. According to the BIM technology-based cantilever cast-in-place continuous beam combined precise positioning construction method of claim 1, it is characterized by: When the bottom plate and web reinforcement are tied (4), 63mm equilateral angle steel is used to make reinforcement clips before the horizontal transverse reinforcement is tied. The size and spacing of the clip slots are precisely prefabricated in the factory according to the optimized drawing data, and the slot width is 2mm larger than the steel bar diameter. The clips are generally 2m long and are placed at each end of the two sides of the horizontal transverse reinforcement.

4. According to the BIM technology-based cantilever cast-in-place continuous beam combined precise positioning construction method of claim 1, it is characterized by: In the installation of the prestressed pipe (5), the full-section combined mesh skeleton is processed into an integral mesh by using φ10 steel bars in three parts, namely, the bottom plate, the web plate and the top plate, according to the relative position of the prestressed pipe in each section. During processing, the gap between the steel bars and the pipe on each side is controlled to be ≤2mm; The spatial coordinates of the prestressed pipes at each section are collected through BIM technology, and the overall cross-shaped frames of each section are manufactured according to the coordinates; the end mold (19), side mold and top plate are used as the reference surface for the positioning of the pipes, the cross-shaped frames are accurately positioned and welded to the steel frame, and the pipes are inserted from the corresponding positions of the cross-shaped frames to achieve accurate installation of the pipes, ensuring that the prestressed tension meets the design requirements.

5. According to the BIM technology-based cantilever cast-in-place continuous beam combined precise positioning construction method of claim 1, it is characterized by: In the installation of the inner mold and the top mold (6), the anchor box is precisely processed by a steel plate factory, and the anchor box and the end mold and the anchor box and the anchor pad are tightly fixed by bolts.

6. According to the BIM technology-based cantilever cast-in-place continuous beam combined precise positioning construction method of claim 1, it is characterized by: The steel bar binding and prestressed pipe installation (5) on the top plate are consistent with the construction method of the lower bottom plate and web plate, and need to be strictly constructed with the help of BIM optimized drawings. The steel bars are positioned using positioning clips and end molds with slots (19), and the prestressed pipes are positioned and installed using a combined mesh frame.

7. According to claim 1, a cantilever cast-in-place continuous beam combined precise positioning construction method based on BIM technology is characterized by: When the concrete pouring (8) is carried out after the mold is closed, the pouring and vibration hole positions of the continuous beam are optimized with the help of BIM visual simulation technology, by arranging reserved vibration channels in the cantilever section bottom plate, top plate and other steel bar dense areas, and reserving vibration windows in the web widening area, manhole and other parts.

8. According to the BIM technology-based cantilever cast-in-place continuous beam combined precise positioning construction method of claim 1, it is characterized by: The specific operation of the joint section construction is: pre-stressing is carried out on both sides of the joint section in advance, the reserved length of the prestressed pipes on both sides is controlled to be no less than 30cm, the middle pipe is embedded and connected with the pipes on both sides and sealed with tape, and the mesh skeleton is arranged at a denser interval of 30cm.

Images