New and old bridge splicing structure and construction method thereof

Abstract

The invention discloses a new and old bridge splicing structure which is characterized in that an old bridge and a new bridge are arranged in parallel in the horizontal direction, lapping grooves are concavely formed in the opposite sides of a boundary beam wing plate of the old bridge and a boundary beam wing plate of the new bridge, and the lapping grooves communicate with the tops of the boundary beam wing plates; and the butt strap is erected on the pair of lapping grooves, gaps between the butt strap and the side walls of the lapping grooves are filled with steel fiber reinforced concrete to form a steel fiber reinforced concrete layer, and the top of the steel fiber reinforced concrete layer, the top of the butt strap and the top of the edge beam wing plate of the new bridge are flush with the top of the edge beam wing plate of the old bridge. The old bridge and the new bridge are in transition connection through the butt strap and the steel fiber reinforced concrete, connection between the old bridge and the new bridge can be effectively improved, the deformation difference between the old bridge and the new bridge can be better dispersed, the old bridge and the new bridge are stably stressed, and therefore it is guaranteed that the whole bridge does not have large secondary internal force. The construction method is simple and easy to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and more specifically, to a new-old bridge splicing structure and a construction method thereof. Background Art

[0002] The demand for increased traffic volume is often met by widening and reconstructing existing old bridges. Compared with building new roads or bridges, widening and reconstructing old bridges on the original site can shorten the construction period and occupy less construction land.

[0003] At present, when widening an old bridge, the concrete of part of the outer cantilever of the old bridge is usually chiseled off first, and the original end steel bars are retained, and a 30-50 cm wide wet joint is reserved between the cantilever end of the new bridge. After the construction of the new bridge is completed, the reserved steel bars at the wet joint are connected, and wet joint concrete is poured to finally achieve the horizontal widening of the new and old bridges. However, due to the different properties of the beam materials between the new and old bridges, there is a large difference in stiffness, and a large secondary internal force will be generated between the two bridges under the action of live loads, which will affect the durability and safety of the bridges.

[0004] Therefore, it is worth considering how to design the structure of the splicing structure of the new and old bridges to solve the above-mentioned technical defects. Summary of the invention

[0005] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0006] In order to achieve these purposes and other advantages according to the present invention, a new and old bridge splicing structure is provided, comprising: The old bridge and the new bridge are arranged side by side in the horizontal direction, and the side beam wing plates of the old bridge and the side beam wing plates of the new bridge are both provided with a slab groove on the opposite side, and the slab groove is connected with the top of the side beam wing plates; A scaffolding plate is mounted on a pair of scaffolding grooves, and two sides of the scaffolding plate are respectively provided with gaps between the side walls of a pair of scaffolding grooves, and the gaps between the scaffolding plate and the side walls of the scaffolding grooves are filled with steel fiber concrete to form a steel fiber concrete layer, and the top of the steel fiber concrete layer, the top of the scaffolding plate, and the top of the side beam wing plate of the new bridge are all arranged flush with the top of the side beam wing plate of the old bridge.

[0007] Preferably, adhesive is applied on the side walls of the strap groove and both sides of the strap plate to form an adhesive layer.

[0008] Preferably, a vertically arranged corrugated steel web is provided in the gap between the strap and the side wall of the strap groove, and steel fiber concrete is filled between the corrugated steel web and the bonding layer to form a steel fiber concrete layer.

[0009] Preferably, a plurality of groups of perforations are provided on the web of the side beam of the old bridge, and the plurality of perforations in each group are arranged in the vertical direction; A plurality of groups of reserved holes corresponding to the through holes are correspondingly provided on the web of the side beam of the new bridge, and connecting rods are provided through the corresponding reserved holes and the through holes.

[0010] Preferably, the gap between the reserved hole and the connecting rod, and the gap between the through hole and the connecting rod are filled with a sealing agent.

[0011] Preferably, the extension line of the axis of the perforation does not intersect with the steel bars on the old bridge, and the extension line of the axis of the reserved hole does not intersect with the steel bars on the new bridge.

[0012] Preferably, a buffer transition layer is provided on the bottom of the slab groove, the upper side of the buffer transition layer is fixedly connected to the bottom of the slab, and the material of the buffer transition layer is epoxy resin elastic concrete.

[0013] Preferably, the material of the buffer transition layer is epoxy resin elastic concrete.

[0014] A construction method for the splicing structure of a new and old bridge is provided, comprising the following steps: S1. Remove the concrete on the side of the side beam wing plate of the old bridge to be widened to form a slab groove. Use a special steel bar detector and radar to accurately detect the distribution of steel bars in the old bridge. Avoid the steel bars in the old bridge and drill holes on the web of the side beam of the old bridge and on the same side of the slab groove; S2. When prefabricating a new bridge, a lap groove is reserved on one side of the flange of the side beam, and a reserved hole corresponding to the perforation is reserved on the web of the side beam and on the same side of the lap groove; S3, hoisting the new bridge so that it is parallel to the old bridge in the horizontal direction, and the staking groove of the old bridge is arranged opposite to the staking groove of the new bridge. During the hoisting process, the connecting rod is passed through the corresponding perforations and reserved holes, and the perforations and reserved holes are sealed with a sealing agent; S4, applying epoxy resin elastic concrete on the bottom of the slab groove to form a buffer transition layer, and then hoisting the prefabricated slab to be erected on a pair of slab grooves; S5. Apply adhesive to the side walls of the lap groove and both sides of the lap plate to form a bonding layer, then vertically set a corrugated steel web in the gap between the lap plate and the lap groove, and then pour steel fiber concrete between the corrugated steel web and the bonding layer to form a steel fiber concrete layer.

[0015] The present invention has at least the following beneficial effects: First, the present invention connects the old bridge and the new bridge by means of a transition plate, which can better disperse the deformation difference between the side beam wing plate of the old bridge and the side beam wing plate of the new bridge, so that the force of the new and old bridges is stable, thereby ensuring that the bridge as a whole has no large secondary internal force.

[0016] Second, the present invention utilizes steel fiber concrete transition to connect the slab with the new bridge and the old bridge, which can effectively improve the shear bearing capacity and tensile bearing capacity of the new and old concrete interfaces of the old bridge and the slab, and effectively reduce the longitudinal deformation problem of the connection between the old bridge and the slab, and the new bridge and the slab.

[0017] Thirdly, the present invention helps to enhance the vertical strength of the steel fiber concrete layer by arranging corrugated steel webs in the gaps between the cladding and the new bridge and the old bridge. Moreover, since the side surfaces of the corrugated steel webs are curved, they have a certain deformation capacity along the direction of splicing of the new and old bridges, and can disperse the longitudinal pressure of traffic loads such as vehicles on the steel fiber concrete layer, reduce the longitudinal settlement of the steel fiber concrete layer due to traffic loads, and reduce the possibility of cracks in the new and old bridges due to the concentration of traffic loads on the steel fiber concrete layer.

[0018] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A side cross-sectional view of the splicing structure according to one of the technical solutions of the present invention; Figure 2 for Figure 1 A magnified view of structure A; Figure 3 A top view of the splicing structure of one of the technical solutions of the present invention; Figure 4 for Figure 3 A magnified view of structure B; Figure 5 A bottom view of the splicing structure according to one of the technical solutions of the present invention; Figure 6 This is a side view of the old bridge according to one of the technical solutions of the present invention.

[0020] The symbols in the drawings are as follows: Old bridge 1, new bridge 2, raft 3, slab 4, buffer transition layer 5, connecting rod 6, steel fiber concrete layer 7, bonding layer 8, corrugated steel web 9. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0022] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] like Figures 1 to 6 As shown, the present invention provides a new and old bridge splicing structure, comprising: The old bridge 1 and the new bridge 2 are arranged side by side in the horizontal direction. The side beam wing plates of the old bridge 1 and the side beam wing plates of the new bridge 2 are both provided with a groove 3 on the opposite side. The groove 3 is connected with the top of the side beam wing plates. Specifically, the groove 3 on the old bridge 1 can be formed by chiseling away the concrete on one side of the side beam wing plates. The groove 3 on the new bridge 2 is reserved when the new bridge 2 is prefabricated. The opposite sides of the old bridge 1 and the new bridge 2 can be in contact or spaced 30 to 50 cm apart. The old bridge 1 and the new bridge 2 are arranged side by side in the horizontal direction so as to facilitate the widening of the old bridge 1 by the following slab 4. The slats 4 are arranged on a pair of slat grooves 3, and the two sides of the slats 4 are respectively arranged with the side wall gaps of the pair of slat grooves 3. The gaps between the slats 4 and the side walls of the slat grooves 3 are filled with steel fiber concrete to form a steel fiber concrete layer 7. The top of the steel fiber concrete layer 7, the top of the slats 4, and the top of the side beam wing plate of the new bridge 2 are all arranged flush with the top of the side beam wing plate of the old bridge 1. Specifically, the slats 4 can be prefabricated with reinforced concrete, and the thickness of the slats 4 is 5 to 10 cm, the width of the batten 4 erected on the new and old bridges is less than 2 / 3 of the side beam wing plates of the new and old bridges but greater than 1 / 2 of the side beam wing plates of the new and old bridges, the batten 4 is erected on a pair of batten grooves 3, and the gap between the batten 4 and the side wall of the batten groove 3 is filled with steel fiber concrete to connect the batten 4 and the new bridge 2 and the old bridge 1. The steel fiber concrete is a composite material formed by uniformly mixing a certain amount of short steel fibers into ordinary concrete. Through the pre-embedded distributed steel fiber connection technology, the shear bearing capacity and tensile bearing capacity of the new and old concrete interface of the old bridge 1 and the batten 4 can be effectively improved, and the longitudinal deformation problem of the connection between the old bridge 1 and the batten 4, and the new bridge 2 and the batten 4 can be effectively reduced. By connecting the new and old bridges through the batten 4, the deformation difference between the side beam wing plates of the old bridge 1 and the side beam wing plates of the new bridge 2 can be better dispersed, so that the force of the new and old bridges is stable, thereby ensuring that the bridge as a whole has no large secondary internal force.

[0024] In the above technical solution, on the side of the old bridge 1 to be widened, part of the concrete on the edge beam wing plate is chiseled out to form a slab 3 connected to the top of the edge beam wing plate, and when prefabricating the new bridge 2, a slab 3 is reserved, and the width of the slab 3 is 1 m. The new bridge 2 is hoisted to the side of the old bridge 1 to be widened, so that it is horizontally arranged side by side with the old bridge 1, and the new and old bridges are separated by 30 cm is set, and then the prefabricated batten 4 is erected on a pair of slats 3, wherein the width of the batten 4 erected on the new and old bridges is less than 2 / 3 of its side beam wing but greater than 1 / 2 of its side beam wing, and then the gap between the batten 4 and the side wall of the slat 3 is filled and poured with steel fiber concrete, so that the two sides of the batten 4 are connected to the new bridge 2 and the old bridge 1, and the batten 4 is used for transitionally connecting the old bridge 1 and the new bridge 2, which can better disperse the deformation difference between the side beam wing of the old bridge 1 and the side beam wing of the new bridge 2, and the use of steel fiber concrete to transitionally connect the batten 4 with the new bridge 2 and the old bridge 1 can effectively improve the shear bearing capacity and tensile bearing capacity of the new and old concrete interfaces of the old bridge 1 and the batten 4, and effectively reduce the longitudinal deformation problem of the connection between the old bridge 1 and the batten 4, and the connection between the new bridge 2 and the batten 4.

[0025] In another technical solution, adhesive is applied on the side walls of the lap groove 3 and both sides of the lap board 4 to form an adhesive layer 8; specifically, the adhesive is an epoxy interface agent, preferably CB-720 epoxy interface agent, which is a highly efficient interface agent used to improve the bonding strength of the two different concrete contact surfaces of the side walls of the lap groove 3 and the side walls of the lap board 4, so as to enhance the connection strength between the old bridge 1 and the new bridge 2 and the lap board 4. The CB-720 epoxy interface agent also has the function of waterproofing and moisture-proofing, and can effectively prevent moisture penetration and prevent moisture from affecting the service life of the entire bridge. Before evenly applying the adhesive on the side walls of the lap groove 3 and both sides of the lap board 4, the side walls of the lap groove 3 and both sides of the lap board 4 need to be roughened to increase the friction of the concrete surface and enhance the adhesion of the adhesive to the concrete surface.

[0026] In another technical solution, a vertically arranged corrugated steel web 9 is provided on the gap between the lap board 4 and the side wall of the lap groove 3, and steel fiber concrete is filled between the corrugated steel web 9 and the bonding layer 8 to form a steel fiber concrete layer 7; specifically, the plate surface of the corrugated steel side beam web is arranged vertically, and the corrugated steel web 9 is first vertically inserted into the gap between the lap board 4 and the side wall of the lap groove 3, and then the steel fiber concrete is filled into the gap between the corrugated steel web 9 and the bonding layer 8 to form a steel fiber concrete layer 7, the corrugated steel web 9 helps to enhance the vertical strength of the steel fiber concrete layer 7, and because the side surface of the corrugated steel web 9 is curved, it has a certain deformation capacity along the direction of splicing of the new and old bridges, and can disperse the longitudinal pressure of traffic loads such as vehicles acting on the steel fiber concrete layer 7, can reduce the longitudinal settlement of the steel fiber concrete layer 7 due to traffic loads, and reduce the possibility of cracks in the new and old bridges due to traffic loads concentrated on the steel fiber concrete layer 7.

[0027] In another technical solution, a plurality of groups of perforations are provided on the web of the side beam of the old bridge 1, and the plurality of perforations in each group are arranged in the vertical direction; A plurality of groups of reserved holes corresponding to the perforations are provided on the web of the side beam of the new bridge 2, and connecting rods 6 are passed through the corresponding reserved holes and the perforations; specifically, the connecting rods 6 are steel bars, preferably high-strength fine-rolled threaded steel bars, and their diameter can be 25 mm, which have the advantages of simple connection and anchoring, strong adhesion, safe and reliable tensioning and anchoring, and convenient construction. The perforations are drilled after detection by a special steel bar detector and radar, and the reserved holes are reserved when the new bridge 2 is prefabricated. When the new bridge 2 is hoisted and installed, the connecting rods 6 are passed through the corresponding perforations and reserved holes to connect the new bridge 2 and the old bridge 1, so as to further enhance the connection between the new and old bridges.

[0028] In another technical solution, the gap between the reserved hole and the connecting rod 6, and the gap between the through hole and the connecting rod 6 are filled with a sealing agent; specifically, the sealing agent can be HY-150 chemical glue or other types of anchoring agents, preferably HY-150 chemical glue. After the connecting rod 6 is inserted into the corresponding through hole and reserved hole, the HY-150 chemical glue is filled into the gap between the reserved hole and the connecting rod 6, and the gap between the through hole and the connecting rod 6 by using a glue squeezing tool, so as to quickly anchor the connecting rod 6, so that the connecting rod 6 has a stronger fastening force with the reserved hole and the through hole, so as to ensure the connection between the new and old bridges.

[0029] In another technical solution, the extension line of the axis of the through hole does not intersect with the steel bars on the old bridge 1, and the extension line of the axis of the reserved hole does not intersect with the steel bars on the new bridge 2; specifically, the setting of the extension line of the axis of the through hole and the extension line of the axis of the reserved hole avoids touching or even affecting the original steel bars of the old bridge 1 when drilling the through hole, thereby affecting the rigidity and stability of the old bridge 1, and can also prevent the connecting rods 6 penetrated through the corresponding reserved holes and through holes from affecting the steel bars on the old bridge 1 and the steel bars on the new bridge 2, thereby affecting the life of the bridge.

[0030] In another technical solution, a buffer transition layer 5 is applied on the bottom of the slat groove 3, and the upper side of the buffer transition layer 5 is fixedly connected to the bottom of the slat plate 4; specifically, the material of the buffer transition layer 5 can be epoxy resin elastic concrete, and the thickness of the buffer transition layer 5 is 2~3 cm. The buffer transition layer 5 has an energy dissipation effect, which can be used to slow down the load transfer between the slat plate 4 and the new bridge 2 and the old bridge 1, and avoid the slat plate 4 and the new bridge 2 and the old bridge 1 from colliding with each other and causing vibration.

[0031] In another technical solution, the material of the buffer transition layer 5 is epoxy resin elastic concrete; specifically, the epoxy resin elastic concrete is mainly composed of epoxy resin and rubber material, and has excellent elasticity and ductility. The epoxy resin elastic concrete enables the buffer transition layer 5 to have an energy dissipation effect to reduce the vibration between the scaffolding 4 and the new bridge 2 and the old bridge 1. The epoxy resin elastic concrete also has good bonding strength, which can make the scaffolding 4 tightly combined with the bottom of the scaffolding groove 3, and can improve the comfort and durability of the scaffolding 4.

[0032] A construction method for the splicing structure of a new and old bridge is provided, comprising the following steps: S1. Remove the concrete on the side of the side beam wing plate of the old bridge 1 to be widened to form a slab groove 3. Use a special steel bar detector and radar to accurately detect the distribution of steel bars in the old bridge 1, avoid the steel bars in the old bridge 1, and drill holes on the web of the side beam of the old bridge 1 and on the same side of the slab groove 3. Specifically, the special steel bar detector is a device using electromagnetic induction technology, which is mainly used to detect the position of steel bars, the thickness of the protective layer, the diameter of steel bars, and the number and direction distribution of steel bars in concrete structures or components. Use the special steel bar detector and radar to accurately detect the distribution of steel bars in the old bridge 1, which helps to avoid affecting the steel bars in the old bridge 1 when drilling and setting holes, thereby affecting the overall stability of the old bridge 1. S2. When prefabricating the new bridge 2, a lap groove 3 is reserved on one side of the flange plate of the side beam, and a reserved hole corresponding to the perforation is reserved on the web plate of the side beam and located on the same side of the lap groove 3; specifically, the reserved hole is reserved according to the position of the perforation on the old bridge 1 when prefabricating the new bridge 2, and when prefabricating the new bridge 2, the steel bars of the new bridge 2 should avoid the reserved hole to reduce the influence of the subsequent connecting rod 6 on the steel bars in the new bridge 2; S3, hoist the new bridge 2 so that it is parallel to the old bridge 1 in the horizontal direction, and the groove 3 of the old bridge 1 is arranged opposite to the groove 3 of the new bridge 2. During the hoisting process, the connecting rod 6 is passed through the corresponding perforations and reserved holes, and the perforations and reserved holes are sealed with a sealing agent; specifically, after the construction of the piers of the new bridge 2 is completed, the prefabricated bridge deck of the new bridge 2 is hoisted so that the groove 3 on it is arranged opposite to the groove 3 of the old bridge 1. During the hoisting process, one end of the connecting rod 6 is first passed through the reserved hole, and then the other end is passed through the perforation. After the connecting rod 6 is correspondingly passed through the perforation and the reserved hole, the perforation and the reserved hole are sealed with a sealing agent to strengthen the connection between the connecting rod 6 and the new and old bridges; S4, applying epoxy resin elastic concrete on the bottom of the slab groove 3 to form a buffer transition layer 5, and then hoisting the prefabricated slab 4 to be slabbed on a pair of slab grooves 3; specifically, applying epoxy resin elastic concrete evenly on the bottom of the slab groove 3 to form a 3 cm thick buffer transition layer 5, which can not only make the connection between the slab 4 and the new and old bridges more tightly, but also play an energy dissipation role, reducing the vibration caused by the mutual collision between the slab 4 and the new bridge 2 and the old bridge 1; S5. Apply adhesive to the side walls of the lap groove 3 and both sides of the lap board 4 to form an adhesive layer 8, and then vertically set a corrugated steel web 9 in the gap between the lap board 4 and the lap groove 3, and then pour steel fiber concrete between the corrugated steel web 9 and the adhesive layer 8 to form a steel fiber concrete layer 7; specifically, first evenly apply adhesive to the side walls of the lap groove 3 and both sides of the lap board 4, which helps to strengthen the connection between the side walls of the lap groove 3 and the poured steel fiber concrete, and the corrugated steel web 9 can not only enhance the vertical strength of the steel fiber concrete layer 7, but also disperse the longitudinal pressure of the traffic load such as vehicles acting on the steel fiber concrete layer 7, and can reduce the longitudinal settlement of the steel fiber concrete layer 7 caused by the traffic load.

[0033] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. The new and old bridge splicing structure is characterized by: include: The old bridge and the new bridge are arranged side by side in the horizontal direction, and the side beam wing plates of the old bridge and the side beam wing plates of the new bridge are both provided with a slab groove on the opposite side, and the slab groove is connected with the top of the side beam wing plates; A scaffolding plate is mounted on a pair of scaffolding grooves, and two sides of the scaffolding plate are respectively provided with gaps between the side walls of a pair of scaffolding grooves, and the gaps between the scaffolding plate and the side walls of the scaffolding grooves are filled with steel fiber concrete to form a steel fiber concrete layer, and the top of the steel fiber concrete layer, the top of the scaffolding plate, and the top of the side beam wing plate of the new bridge are all arranged flush with the top of the side beam wing plate of the old bridge.

2. The new and old bridge splicing structure according to claim 1 is characterized in that: Adhesive is applied to the side walls of the strap groove and both sides of the strap plate to form an adhesive layer.

3. The new and old bridge splicing structure according to claim 2 is characterized in that: A vertically arranged corrugated steel web is provided on the gap between the strap plate and the side wall of the strap groove, and steel fiber concrete is filled between the corrugated steel web and the bonding layer to form a steel fiber concrete layer.

4. The new and old bridge splicing structure according to claim 1, characterized in that: The side beam web of the old bridge is provided with a plurality of groups of perforations, and the plurality of perforations in each group are arranged in the vertical direction; A plurality of groups of reserved holes corresponding to the through holes are correspondingly provided on the web of the side beam of the new bridge, and connecting rods are provided through the corresponding reserved holes and the through holes.

5. The new and old bridge splicing structure according to claim 4 is characterized in that: The gap between the reserved hole and the connecting rod and the gap between the through hole and the connecting rod are filled with a sealing agent.

6. The new and old bridge splicing structure according to claim 4, characterized in that: The extended line of the axis of the perforation does not intersect with the steel bars on the old bridge, and the extended line of the axis of the reserved hole does not intersect with the steel bars on the new bridge.

7. The new and old bridge splicing structure according to claim 1 is characterized in that: A buffer transition layer is provided on the bottom of the strap groove, and the upper side of the buffer transition layer is fixedly connected to the bottom of the strap plate.

8. The new and old bridge splicing structure according to claim 7, characterized in that: The material of the buffer transition layer is epoxy resin elastic concrete.

9. The construction method of the new and old bridge splicing structure according to any one of claims 1 to 8 is characterized in that: The following steps are involved: S1. Remove the concrete on the side of the side beam wing plate of the old bridge to be widened to form a slab groove. Use a special steel bar detector and radar to accurately detect the distribution of steel bars in the old bridge. Avoid the steel bars in the old bridge and drill holes on the web of the side beam of the old bridge and on the same side of the slab groove; S2. When prefabricating a new bridge, a slab groove is reserved on one side of the flange plate of the side beam, and a reserved hole corresponding to the perforation is reserved on the web plate of the side beam and on the same side of the slab groove; S3, hoisting the new bridge so that it is parallel to the old bridge in the horizontal direction, and the staking groove of the old bridge is arranged opposite to the staking groove of the new bridge. During the hoisting process, the connecting rod is passed through the corresponding perforations and reserved holes, and the perforations and reserved holes are sealed with a sealing agent; S4, applying epoxy resin elastic concrete on the bottom of the slab groove to form a buffer transition layer, and then hoisting the prefabricated slab to be erected on a pair of slab grooves; S5. Apply adhesive to the side walls of the lap groove and both sides of the lap plate to form a bonding layer, then vertically set a corrugated steel web in the gap between the lap plate and the lap groove, and then pour steel fiber concrete between the corrugated steel web and the bonding layer to form a steel fiber concrete layer.

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