Bridge support and mounting method thereof

Abstract

The invention relates to the technical field of bridge construction, and particularly discloses a bridge support and a mounting method thereof.The bridge support comprises a bearing mechanism and a splicing mechanism, the bearing mechanism comprises a pier column, a steel box girder and a bridge floor, the steel box girder is fixedly arranged on the upper surface of the pier column, the bridge floor is located above the steel box girder, and the splicing mechanism comprises an original box girder and a new box girder; a splicing groove is formed in the new box girder, a transverse partition plate is fixedly connected to the original box girder, and the transverse partition plate is embedded into the splicing groove; according to the device, the splice plates extending outwards are arranged on the original prestressed concrete cast-in-place box girder, and the notches matched with the splice plates are formed in the new box girder, so that during construction, the total station is firstly used for accurately fitting the heights of the new bridge and the old bridge, and data support is provided for subsequent hoisting; and the laser positioning technology is used for guaranteeing that the splicing positions of the new box girders and the old box girders are accurately aligned during splicing, follow-up pavement construction of the bridge deck is facilitated, and the EUA concrete expanding agent is added to the splicing positions of the new bridge and the old bridge, so that dry shrinkage of concrete can be compensated, and the compactness of the concrete is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a bridge support and an installation method thereof. Background Art

[0002] The full name of the flyover is a three-dimensional cross-traffic bridge, which refers to a bridge built across another road at the intersection of cross roads. The main purpose is to ensure that traffic at the intersection is not affected, and there is no need to be disturbed by traffic jams caused by stops at traffic lights. When building an flyover, it is necessary to build bearings between the flyover and the ground to provide support measures for the bridge body. The bridge bearings can transfer the dead load and live load of the bridge superstructure to the piers, including the vertical and horizontal forces caused by the dead load and live load, and can also resist the structural translation caused by wind, seismic waves, etc., and reduce the adverse effects of vibration on the structure. The design and selection of flyover bearings need to consider many factors, including the load level of the bridge, environmental factors (such as temperature and humidity changes), and expected service life. Common bearing types include simple cushion bearings, rubber bearings (such as plate rubber bearings, polytetrafluoroethylene skateboard rubber bearings, ball crown round plate rubber bearings, basin rubber bearings), curved steel plate bearings, reinforced concrete pendulum column bearings, etc.;

[0003] When constructing an overpass, there will be a situation where the new and old bridge sections overlap. At this time, the old bridge deck needs to be spliced ​​and widened. Traditional construction methods cannot guarantee the accuracy of the splicing of the new and old bridge deck supports. The protruding part of the box girder caused by insufficient precision during splicing may affect the subsequent bridge deck paving construction.

[0004] To this end, those skilled in the art have proposed a bridge bearing and an installation method thereof to solve the problems raised by the background art.

[0005] The above information disclosed in this background technology is only used to increase the understanding of the background technology of the present invention and therefore, it may include information that does not constitute the prior art known to ordinary technicians in this field. Summary of the invention

[0006] The object of the present invention is to provide a bridge bearing and an installation method thereof to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A bridge bearing, comprising:

[0009] A bearing mechanism, the bearing mechanism comprising a pier, a steel box girder and a bridge deck, the steel box girder being fixedly arranged on the upper surface of the pier, and the bridge deck being located above the steel box girder;

[0010] The splicing mechanism comprises an original box beam and a new box beam, the new box beam is provided with a splicing groove, the original box beam is fixedly connected with a transverse partition, and the transverse partition is embedded in the splicing groove.

[0011] Preferably, a plurality of support pads are fixedly mounted on the upper surface of the steel box girder, and the bridge deck is arranged on the support pads.

[0012] Preferably, a method for installing a bridge bearing is characterized by comprising the following steps:

[0013] S1 Modeling and Design: Use drones and 3D laser scanning technology to collect image information of the construction site, use BIM technology to perform modeling and design and construction analysis based on the collected information, and provide data guidance for subsequent construction;

[0014] S2 support construction: select the appropriate drilling rig type according to the geological conditions to carry out the pier foundation pit drilling construction, and after the foundation is made, the pier column pouring work is carried out;

[0015] S3 box girder production: conduct on-site survey, prepare materials required for prestressed steel box girder production, formulate construction plan, and organize manpower and material resources to cast steel box girder;

[0016] S4 New and old bridge widening: The new steel box girder will be spliced ​​with the old steel box girder on the existing bridge. Before the splicing construction, 3D laser scanning and BIM technology will be used to simulate the pre-assembly, hoisting and visual disclosure of the steel box girder. Animation roaming will be used to assist the implementation of traffic diversion. Point cloud reverse modeling will be used to assist the docking construction of the new and old steel box girder bridges to ensure that the steel box girder has a smooth appearance, a flat bottom surface, a flat and dense joint, no misalignment, and the welds and surface coatings of the box girder are uniform.

[0017] S5 Follow-up facilities installation: Installation of expansion joints, sound barriers and drainage pipes under the bridge.

[0018] Preferably, in the modeling and design operation, a drone equipped with three-dimensional laser scanning technology is controlled to move to the construction site, and the geographical environment image information of the site is collected, and three-dimensional modeling is performed using BIM technology based on the collected data, so as to provide data support for project drawing review, drawing in-depth design, three-dimensional interaction of scheme briefing, and mechanical model analysis.

[0019] Preferably, in the modeling and design operation, the in-depth design of the drawings includes optimizing the construction organization by integrating BIM technology with intelligent and smart means in the early stage of the project, discovering the key points and key points of the design, conducting collision tests between the design and the construction site, finding the conflict points and design defects in advance, formulating a material and equipment use plan, compensating for the delay shortcomings of the design plan, and optimizing the selection of materials and equipment.

[0020] Preferably, in the support construction operation, a foundation pit is first excavated underground, and then a foundation is poured with concrete. The foundation is a cubic structure composed of concrete. A skeleton of the pier is woven on the foundation using steel bars to form the main supporting structure of the pier column. A pier mold welded with steel plates is then spliced ​​onto the pier skeleton to ensure that the shape and size of the pier column meet the design requirements. Finally, concrete is poured into the skeleton spliced ​​with steel bars and the mold to complete the construction of the pier column.

[0021] Preferably, in the support construction operation, during the excavation of the foundation pit, a rotary drilling rig is first used to drill a hole, and the hole drilling depth reaches the original soil layer. A pulling machine is used to bury an extended casing, and the bottom of the casing is buried to less than one meter deep in the original soil layer. Then a reverse circulation process is used to form a hole. During the drilling process of the rotary drilling rig, construction waste and concrete blocks are replaced by a large excavation method and then an extended casing is buried. The reverse circulation process is used to form a hole to ensure the construction quality of the bored piles.

[0022] Preferably, in the box girder manufacturing operation, a foundation survey is first carried out to determine the location of the installation bridge section, and steel bars, concrete, lifting equipment, formwork and brackets are prepared. During construction, the formwork is installed and the steel bars are arranged first, and then the prestressed steel strands are installed, tensioned and anchored, and finally concrete is poured.

[0023] Preferably, during the box girder manufacturing operation, the template uses No. 60 steel pipe and adjustable fastener-type connecting components to ensure the basic reliability of the bridge support system. For the erection of the curved section support system, measuring instruments are used in combination with foundation layout, increased support spacing and increased scissors bracing to ensure the safety of the curved section system. A digital monitoring system is used to combine real-time monitoring with real-time video to monitor and warn the support system in all directions, providing safety guarantees for the construction of the entire bridge box girder.

[0024] Preferably, in the widening operation of the new and old bridges, lifting equipment is used to align the splicing grooves on the manufactured new box beam with the diaphragms on the original box beams for splicing. During the splicing process, the elevation of the old bridge is first fitted to control the elevation difference after the box beams of the new and old bridges are spliced, ensuring that the elevation of the top surface of the bridge deck pavement after the beams and slabs are erected is consistent with the elevation of the top surface of the bridge deck pavement of the original bridge. EUA concrete expansion agent is added at the joint of the new and old bridges to compensate for the shrinkage of cement concrete and enhance the stability of the structure, and the technology of total station measurement and laser positioning is used to provide guarantee for the splicing accuracy.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The present invention uses BIM technology to realize intelligent engineering, provides accurate premise data support for bridge construction, uses construction waste to fill the foundation pit, and adopts the reverse circulation process for drilling, thereby ensuring the construction quality of bored piles. For the splicing of the new and old bridge sections, the present invention sets an extended splicing plate on the original prestressed concrete cast-in-place box girder, and sets a corresponding notch on the new box girder. During construction, a total station is first used to accurately fit the height of the new and old bridges to provide data support for subsequent lifting, and laser positioning technology is used to ensure that the splicing of the new and old box girders is accurately aligned during splicing, which is beneficial to the subsequent paving construction of the bridge deck. EUA concrete expansion agent is added to the splicing of the new and old bridges to compensate for the shrinkage of concrete and improve the compactness of concrete. EUA expansion agent can establish pre-compression stress in concrete, which can effectively offset the tensile stress generated by concrete during the hardening process, thereby preventing or reducing concrete shrinkage cracking, thereby enhancing the impermeability and crack resistance of concrete, and improving the waterproof and crack resistance effect of bridge bearings.

[0027] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of the installation method of the present invention;

[0029] Figure 2 It is a front view of the present invention;

[0030] Figure 3 It is a schematic diagram of the steel box girder splicing of the present invention.

[0031] In the figure: 1. Pier; 2. Steel box girder; 3. Bridge deck; 4. Support pads; 5. Original box girder; 6. New box girder; 7. Splicing groove; 8. Diaphragm. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1:

[0034] See also Figure 2-Figure 3 As shown, a bridge bearing comprises:

[0035] The bearing mechanism includes a pier 1, a steel box girder 2 and a bridge deck 3. The steel box girder 2 is fixedly arranged on the upper surface of the pier 1, and the bridge deck 3 is located above the steel box girder 2;

[0036] The splicing mechanism comprises an original box beam 5 and a new box beam 6 . A splicing groove 7 is provided on the new box beam 6 . A transverse partition 8 is fixedly connected to the original box beam 5 . The transverse partition 8 is engaged with the splicing groove 7 .

[0037] Specifically, a plurality of support pads 4 are fixedly installed on the upper surface of the steel box girder 2 , and the bridge deck 3 is arranged on the support pads 4 .

[0038] A method for installing a bridge bearing comprises the following steps:

[0039] S1 Modeling and Design: Use drones and 3D laser scanning technology to collect image information of the construction site, use BIM technology to perform modeling and design and construction analysis based on the collected information, and provide data guidance for subsequent construction;

[0040] S2 support construction: select the appropriate drilling rig type according to the geological conditions to carry out the pier foundation pit drilling construction, and after the foundation is made, the pier column pouring work is carried out;

[0041] S3 box girder production: conduct on-site survey, prepare materials required for prestressed steel box girder production, formulate construction plan, and organize manpower and material resources to cast steel box girder;

[0042] S4 New and old bridge widening: The new steel box girder will be spliced ​​with the old steel box girder on the existing bridge. Before the splicing construction, 3D laser scanning and BIM technology will be used to simulate the pre-assembly, hoisting and visual disclosure of the steel box girder. Animation roaming will be used to assist the implementation of traffic diversion. Point cloud reverse modeling will be used to assist the docking construction of the new and old steel box girder bridges to ensure that the steel box girder has a smooth appearance, a flat bottom surface, a flat and dense joint, no misalignment, and the welds and surface coatings of the box girder are uniform.

[0043] S5 Follow-up facilities installation: Installation of expansion joints, sound barriers and drainage pipes under the bridge.

[0044] Specifically, during the modeling and design operation, the drone equipped with 3D laser scanning technology is controlled to move to the construction site, and the geographical environment image information of the site is collected. Based on the collected data, 3D modeling is performed using BIM technology to provide data support for project drawing review, drawing in-depth design, 3D interaction of scheme briefing, and mechanical model analysis.

[0045] Specifically, in the modeling and design operation, the in-depth design of the drawings includes using intelligent and smart means to integrate BIM technology to optimize the construction organization in the early stage of the project, discover the design points and key points, conduct collision tests between the design and construction site, find the conflict points and design defects in advance, formulate a material and equipment use plan, make up for the design delay shortcomings, optimize the selection of materials and equipment, and use BIM technology to simulate the construction process online in advance, which can determine the feasibility of the project and discover the specific difficulties in the project, facilitating subsequent planning and optimization.

[0046] Specifically, during the support construction operation, a foundation pit is first excavated underground, and then the foundation is poured with concrete. The foundation is a cubic structure made of concrete. Steel bars are used to weave the skeleton of the pier on the foundation, forming the main supporting structure of the pier. The pier mold welded with steel plates is then spliced ​​onto the pier skeleton to ensure that the shape and size of the pier meet the design requirements. Finally, concrete is poured into the skeleton made of steel bars and molds to complete the construction of the pier.

[0047] Specifically, in the support construction operation, during the foundation pit excavation process, a rotary drilling rig is first used to drill a hole, and the depth of the hole is as deep as the original soil layer. A pulling machine is used in conjunction with the burying of an extended casing, and the bottom of the casing is buried to less than one meter below the original soil layer. Then the reverse circulation process is used to drill a hole. During the drilling process of the rotary drilling rig, the construction waste and concrete blocks are replaced by a large excavation method, and then the extended casing is buried. The reverse circulation process is used to drill a hole to ensure the construction quality of the bored piles. Different drilling methods are used according to the different landfill conditions of the pile foundation, which optimizes the construction process and improves the construction efficiency and quality.

[0048] Specifically, in the box girder manufacturing operation, the foundation survey is first carried out to determine the location of the installation section, and then the steel bars, concrete, lifting equipment, formwork and support are prepared. During construction, the formwork is installed and the steel bars are arranged first, and then the prestressed steel strands are installed, tensioned and anchored, and finally the concrete is poured.

[0049] Specifically, during the box girder manufacturing operation, the template uses No. 60 steel pipes and adjustable fastener-type connection components to ensure the basic reliability of the bridge support system. For the erection of the curved section support system, measuring instruments are used in combination with foundation layout, increased support spacing and increased scissors bracing to ensure the safety of the curved section system. A digital monitoring system is used to combine real-time monitoring with real-time video to monitor and warn of the support system in all directions, providing safety guarantees for the construction of the entire bridge box girder.

[0050] Specifically, during the widening operation of the new and old bridges, lifting equipment is used to align the splicing groove 7 on the new box girder 6 with the diaphragm 8 on the original box girder 5 for splicing. During the splicing process, the elevation of the old bridge is first fitted to control the elevation difference after the box girders of the new and old bridges are spliced, ensuring that the elevation of the top surface of the bridge deck pavement after the beams and slabs are erected is consistent with the elevation of the top surface of the bridge deck pavement of the original bridge. EUA concrete expansion agent is added at the joint of the new and old bridges to compensate for the shrinkage of cement concrete and enhance the stability of the structure, and the technology of total station measurement and laser positioning is used to provide guarantee for the splicing accuracy.

[0051] As can be seen from the above, the present invention uses BIM technology to realize intelligent engineering, provides accurate premise data support for bridge construction, uses construction waste to fill the foundation pit, and adopts the reverse circulation process for drilling, which ensures the construction quality of bored piles. For the splicing of the new and old bridge sections, the present invention sets an extended splicing plate on the original prestressed concrete cast-in-place box girder, and sets a corresponding notch on the new box girder. Before construction, the 3D modeling technology is used to simulate the splicing to determine the feasibility of the construction, and at the same time, the difficulties in the construction process are discovered to facilitate subsequent optimization. During construction, a total station is first used to simulate the new and old The height of the bridge is accurately fitted to provide data support for subsequent lifting, and laser positioning technology is used to ensure the precise alignment of the joints of the new and old box girders during splicing, which is beneficial to the subsequent paving construction of the bridge deck. Adding EUA concrete expansion agent at the joints of the new and old bridges can compensate for the shrinkage of concrete and improve the compactness of concrete. EUA expansion agent can establish pre-compression stress in concrete, which can effectively offset the tensile stress generated by concrete during the hardening process, thereby preventing or reducing concrete shrinkage cracking, thereby enhancing the concrete's impermeability and crack resistance, and improving the waterproof and crack resistance of the bridge bearings.

[0052] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can be customized according to the description and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0053] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0057] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0058] 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 bridge bearing, characterized in that: include: A load-bearing mechanism, the load-bearing mechanism comprising a pier (1), a steel box girder (2) and a bridge deck (3), the steel box girder (2) being fixedly arranged on the upper surface of the pier (1), and the bridge deck (3) being located above the steel box girder (2); A splicing mechanism, the splicing mechanism comprises an original box beam (5) and a new box beam (6), the new box beam (6) is provided with a splicing groove (7), the original box beam (5) is fixedly connected with a transverse partition (8), and the transverse partition (8) is embedded in the splicing groove (7).

2. A bridge bearing according to claim 1, characterized in that: A plurality of support pads (4) are fixedly mounted on the upper surface of the steel box girder (2), and the bridge deck (3) is arranged on the support pads (4).

3. A method for installing a bridge bearing according to any one of claims 1-2, characterized in that: The following steps are involved: S1 Modeling and Design: Use drones and 3D laser scanning technology to collect image information of the construction site, and use BIM technology to perform modeling and design and construction analysis based on the collected information to provide data guidance for subsequent construction; S2 support construction: select the appropriate drilling rig type according to the geological conditions to carry out the pier foundation pit drilling construction, and after the foundation is made, the pier column pouring work is carried out; S3 box girder production: conduct on-site survey, prepare materials required for prestressed steel box girder production, formulate construction plan, and organize manpower and material resources to cast steel box girder; S4 New and old bridge widening: The new steel box girder will be spliced ​​with the old steel box girder on the existing bridge. Before the splicing construction, 3D laser scanning and BIM technology will be used to simulate the pre-assembly, hoisting and visual disclosure of the steel box girder. Animation roaming will be used to assist the implementation of traffic diversion. Point cloud reverse modeling will be used to assist the docking construction of the new and old steel box girder bridges to ensure that the steel box girder has a smooth appearance, a flat bottom surface, a flat and dense joint, no misalignment, and the welds and surface coatings of the box girder are uniform. S5 Follow-up facilities installation: Installation of bridge expansion joints, sound barriers and drainage pipes under the bridge.

4. The method for installing a bridge support according to claim 3, characterized in that: During the modeling and design operation, a drone equipped with 3D laser scanning technology is controlled to move to the construction site, and the geographical environment image information of the site is collected. Based on the collected data, 3D modeling is performed using BIM technology to provide data support for project drawing review, drawing in-depth design, 3D interaction of scheme briefing, and mechanical model analysis.

5. The method for installing a bridge bearing according to claim 4, characterized in that: In the modeling and design operation, the in-depth design of the drawings includes using intelligent and smart means to integrate BIM technology to optimize the construction organization in the early stage of the project, discover the key points and focus of the design, conduct collision tests between the design and the construction site, find the conflict points and design defects in advance, formulate a material and equipment use plan, make up for the delay shortcomings of the design plan, and optimize the selection of materials and equipment.

6. The method for installing a bridge bearing according to claim 3, characterized in that: During the support construction operation, a foundation pit is first excavated underground, and then a foundation is poured with concrete. The foundation is a cubic structure made of concrete. Steel bars are used to weave the skeleton of the pier on the foundation, forming the main supporting structure of the pier column. The pier mold welded with steel plates is then spliced ​​onto the pier skeleton to ensure that the shape and size of the pier column meet the design requirements. Finally, concrete is poured into the skeleton spliced ​​with steel bars and the mold to complete the construction of the pier column.

7. The method for installing a bridge bearing according to claim 6, characterized in that: During the support construction operation and the excavation process of the foundation pit, a rotary drilling rig is first used to drill a hole, and the depth of the hole is as deep as the original soil layer. A drilling and pulling machine is used to bury an extended casing, and the bottom of the casing is buried to less than one meter below the original soil layer. Then a reverse circulation process is used to drill a hole. During the drilling process of the rotary drilling rig, construction waste and concrete blocks are replaced by a large excavation method and then an extended casing is buried. The reverse circulation process is used to drill a hole to ensure the construction quality of the bored piles.

8. The method for installing a bridge bearing according to claim 3, characterized in that: In the box girder manufacturing operation, the foundation survey is first carried out to determine the location of the installation section, and the steel bars, concrete, lifting equipment, formwork and brackets are prepared. During construction, the formwork is installed and the steel bars are arranged first, and then the prestressed steel strands are installed, tensioned and anchored, and finally the concrete is poured.

9. A method for installing a bridge bearing according to claim 8, characterized in that: During the box girder manufacturing operation, the template uses No. 60 steel pipe and adjustable fastener-type connecting components to ensure the basic reliability of the bridge support system. For the erection of the curved section support system, measuring instruments are used in combination with foundation layout, increased support spacing and increased scissors bracing to ensure the safety of the curved section system. A digital monitoring system is used to combine real-time monitoring with real-time video to monitor and warn the support system in all directions, providing safety guarantees for the construction of the entire bridge box girder.

10. The method for installing a bridge bearing according to claim 3, characterized in that: In the widening operation of the new and old bridges, a lifting device is used to align the splicing groove (7) on the manufactured new box beam (6) with the diaphragm (8) on the original box beam (5) for splicing. During the splicing process, the elevation of the old bridge is first fitted to control the elevation difference after the splicing of the box beams of the new and old bridges, to ensure that the elevation of the top surface of the bridge deck pavement after the beam and slab are erected is consistent with the elevation of the top surface of the bridge deck pavement of the original bridge. EUA concrete expansion agent is added at the splicing of the new and old bridges to compensate for the shrinkage of cement concrete and enhance the stability of the structure, and the technology of total station measurement and laser positioning is used to provide guarantee for the splicing accuracy.

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