A prefabricated slab structure behind a steel temporary bridge abutment and its construction technology

Abstract

The present invention relates to a prefabricated slat structure and construction process behind a temporary steel bridge abutment. An elastic leveling layer, a prefabricated slat, an elastic shock-absorbing layer, and a bridge deck are sequentially arranged at the abutment corbel from bottom to top. The corbel is connected to the prefabricated slat and the elastic shock-absorbing layer by a transverse limiting rod, and the gaps between the corbel, the prefabricated slat and the transverse limiting rod are filled with solid slurry filler; a bridge deck limiter is arranged on the outer side of the elastic shock-absorbing layer on the prefabricated slat, and is connected to the bridge deck by a vertical limiting rod; backfill material behind the abutment is filled under the slat, and the backfill material behind the abutment, the road structure layer, and the road surface layer are sequentially filled on the slat to the designed elevation. The present invention can not only increase construction speed and reduce project cost, but also improve driving safety and the durability of the road surface layer, reduce noise generated by vehicles passing through the abutment position, and make deformation behind the abutment more coordinated.

Description

Technical Field

[0001] The present invention relates to the field of bridge engineering, and in particular to a prefabricated slab structure behind a temporary steel bridge pier and a construction process. Background Art

[0002] During urban road reconstruction and expansion, traffic disruption is typically not permitted to minimize the impact on urban production and life. Construction parties typically construct temporary traffic detours to maintain access. These detours feature high safety requirements, a short construction period, low cost, a certain level of comfort, and a short service life. Bridges, as key node projects on these roads, exhibit these characteristics even more prominently. Prefabricated steel temporary bridges are widely used in such projects due to their safety, economy, and convenience. However, the decking behind the abutment still utilizes cast-in-place concrete structures, which require a long construction period and are difficult to recycle. Furthermore, the bridge deck typically utilizes printed steel plates, which lack an effective connection to the asphalt concrete pavement behind the abutment. After a period of use, problems such as warping and deformation of the deck edges at the abutments and damage to the asphalt pavement can occur, severely impacting driving safety and comfort. These bridges also generate considerable driving noise, impacting nearby residential areas and offices.

[0003] Therefore, how to speed up construction, improve the durability of the road surface at the abutment, and reduce the wheel noise at the abutment under the premise of ensuring safety and economy has become an urgent problem to be solved by technical personnel in this field. Summary of the Invention

[0004] The purpose of the present invention is to provide a prefabricated slab structure behind a temporary steel abutment and a construction process that can be quickly installed and disassembled, can prevent the steel bridge deck at the abutment from warping, and can reduce traffic noise at the abutment.

[0005] According to the first aspect of the present invention, the technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A prefabricated slat structure behind a steel temporary bridge pier, characterized in that: an elastic leveling layer, a prefabricated slat, an elastic shock-absorbing layer, and a bridge deck are arranged in sequence from bottom to top at the pier corbel; the prefabricated slat includes a straight section and a downward slope, and the corbel is connected to the straight section and the elastic shock-absorbing layer of the prefabricated slat via a limiting structure; a bridge deck limiter is provided on the outside of the elastic shock-absorbing layer of the straight section of the prefabricated slat, and the bridge deck limiter is connected to the bridge deck via a vertical limiting structure; the lower part of the inclined section of the prefabricated slat is filled with backfill material behind the platform, and the upper part of the inclined section of the prefabricated slat is filled with backfill material behind the platform.

[0007] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0008] The prefabricated slats are connected by transverse limiting rods and corbels. The elastic shock-absorbing layer also has holes for the transverse limiting rods. The tops of the transverse limiting rods are located in the elastic shock-absorbing layer. The gaps between the prefabricated slats, corbels and transverse limiting rods are filled with solid slurry fillers.

[0009] The prefabricated scaffolding is prefabricated with steel, and its cross section is a single-box multi-chamber structure. It is welded together by four parts: the scaffolding top, the bottom plate, the scaffolding longitudinal ribs, the scaffolding buckles, and the bridge deck limiters. The prefabricated scaffolding is provided with the downward slope outside the abutment corbel. The prefabricated scaffolding buckles are provided on both sides of the prefabricated scaffolding.

[0010] The edge of the bridge deck at the abutment is bent downward, and the bridge deck limiter is made of angle steel. The horizontal edge of the angle steel is welded to the top surface of the straight section, and the vertical edge of the angle steel is connected to the downward bent portion of the bridge deck edge through a vertical limiting structure. The vertical limiting structure uses rods such as expansion anchors for vertical limitation, and the vertical edge of the angle steel and the downward bent portion of the bridge deck edge are provided with holes connected to the rods.

[0011] The elastic leveling layer is arranged between the abutment corbel and the prefabricated slab and adopts rubber gasket or oil felt.

[0012] The elastic shock-absorbing layer is arranged between the prefabricated slab and the bridge deck and is made of a rubber sheet.

[0013] The top elevation of the transverse limit rod should be 2 to 3 cm lower than the top elevation of the elastic shock-absorbing layer, and plain round steel bars should be used.

[0014] The solid slurry filler is made of epoxy resin or hot-melt material.

[0015] The backfill material behind the platform is medium-coarse sand or crushed stone with good gradation.

[0016] According to the second aspect of the present invention, the technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0017] A construction process for a prefabricated slab structure behind a steel temporary bridge abutment, characterized by comprising the following construction steps:

[0018] 1) Prefabricated scaffolding is prefabricated in the factory. The single-box multi-chamber structure is formed by welding "I"-shaped parts. After the prefabricated scaffolding is completed, it is rust-proofed and painted with anti-corrosion paint;

[0019] 2) Pour concrete for the abutment corbel and reserve holes for transverse limit rods. Cover the reserved holes for transverse limit rods during the concrete curing period until the installation of precast slabs.

[0020] 3) Backfill the abutment to the design elevation of the bottom surface of the prefabricated slab, level the site, and construct the elastic leveling layer of the abutment bracket;

[0021] 4) The precast slabs are transported to the project site by car and installed by crane. The slabs are then aligned with the holes of the transverse limit rods of the abutment corbels.

[0022] 5) After injecting solid slurry filler into the hole of the transverse limit rod, insert the transverse limit rod;

[0023] 6) Install the elastic shock-absorbing layer, lay the steel bridge deck, install the vertical limit rods, backfill the remaining part behind the platform, and construct the road structure layer and road surface layer;

[0024] After the use of the temporary road is over, the road behind the platform will be dismantled, and the scaffolding structure will be dismantled in reverse order according to the installation sequence, and the prefabricated scaffolding will be recovered.

[0025] The present invention has the following characteristics and beneficial effects:

[0026] (1) The use of recyclable prefabricated slabs increases construction speed and reduces project costs;

[0027] (2) The prefabricated slab is set with a certain slope. Even if the top surface of the slab is deformed during the turnover process, it can quickly drain water to prevent water accumulation on the road surface. At the same time, a gradual transition section of the roadbed structure is formed, and the deformation coordination behind the slab is more reasonable.

[0028] (3) The elastic shock-absorbing layer at the abutment can effectively reduce the noise generated by vehicles passing through the abutment and reduce the impact on the environment.

[0029] (4) Prefabricated slabs are used to set bridge deck limiters, which effectively connect the edge of the bridge deck at the abutment with the slabs, limiting the warping deformation of the bridge deck edge. At the same time, it also has a restraining effect on the road surface behind the abutment, thereby improving driving safety and the durability of the road surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the prefabricated slab structure behind the steel temporary bridge pier of the present invention.

[0031] Figure 2 for Figure 1 General drawing of the boarding at the corbel.

[0032] Figure 3 for Figure 1 Cross-section of the planking.

[0033] In the figure: 1-road surface layer, 2-road structure layer, 3-backfill material behind the abutment, 4-precast slab, 5-bridge deck longitudinal and transverse beam system, 6-bridge deck, 7-steel truss, 8-support, 9-bridge abutment corbel, 10-bridge deck limiter, 11-elastic shock-absorbing layer, 12-lateral limit rod, 13-elastic leveling layer, 14-vertical limit rod, 15-solid slurry filler, 16-slab buckle, 17-slab top and bottom plates, 18-slab longitudinal rib, 19-buckle longitudinal rib, 20-bridge abutment. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings. However, the present invention is not intended to be limited to the specific structures and applicable scopes shown and described below. Therefore, all corresponding modifications and equivalents that may be utilized should be included in the scope of protection of the present invention.

[0035] Reference Figure 1 、 Figure 2 、 Figure 3 The prefabricated slab structure behind the steel temporary bridge abutment of the present invention is designed as follows:

[0036] At the abutment corbel 9, an elastic leveling layer 13, a prefabricated slat 4, an elastic damping layer 11, and a bridge deck 6 are sequentially arranged from bottom to top. The prefabricated slat 4 is quickly connected to the corbel 9 by means of horizontal limiting, and a hole for the transverse limiting rod 12 is also reserved in the elastic damping layer 11. The top of the transverse limiting rod 12 is located in the elastic damping layer 11. The gap between the corbel 9 of the prefabricated slat 4 and the transverse limiting rod 12 is filled with a solid slurry filler 15; a bridge deck limiter 10 is arranged on the outside of the elastic damping layer 11 on the prefabricated slat 4 and is connected to the bridge deck 6 via a vertical limiting rod 14; the backfill material 3 behind the abutment is filled under the slat 4, and the backfill material 3, the road structure layer 2, and the road surface layer (1) are sequentially filled on the slat 4 to the design elevation.

[0037] The precast scaffolding 4 can adopt a single-box, multi-chamber structure. Taking a project in which this embodiment is applied as an example, the precast scaffolding 4 is prefabricated from Q345 steel, with a horizontal projection length of 5.0m, a width of 2.5m, and a height of 0.25cm. The straight section 41 of the precast scaffolding 4 at the abutment corbel 9 is 500mm long, while the remaining section adopts a 1:5 downward slope 42. The scaffolding top and bottom plates 17 are 12mm thick. The scaffolding longitudinal ribs 18 are 8mm thick and 226mm high, and are evenly spaced 303mm apart horizontally. The scaffolding buckles 16 are formed by the scaffolding top and bottom plates 17, buckle longitudinal ribs 19, and the outermost scaffolding longitudinal ribs 18. The scaffolding top and bottom plates 17 each extend 32mm to one side. The buckle longitudinal ribs 19 are 12mm thick and 206mm high. The bridge deck limiter 10 adopts ∟63 type angle steel, the length of which is consistent with the width of the prefabricated cladding 4. Its horizontal edge is welded at 400mm away from the edge of the top surface of the straight section of the prefabricated cladding 4, and 18mm circular holes are opened every 300mm on the vertical edge; the prefabricated cladding 4 reserves holes for transverse limit rods 12 with an inner diameter of 26mm every 500mm in the width direction at the position of the abutment corbel 9, and a circular steel pipe with an outer diameter of 32mm and a wall thickness of 3mm is used to form a closed hole wall with the prefabricated cladding 4.

[0038] The elastic leveling layer 13 is arranged between the abutment corbel 9 and the prefabricated tread 4. In this embodiment, 1 cm thick asphalt felt is used.

[0039] The elastic shock-absorbing layer 11 is arranged between the prefabricated scaffolding 4 and the bridge deck 6. In this embodiment, an 80mm thick rubber plate is used and is arranged over the entire width of the prefabricated scaffolding 4. In this embodiment, 12 holes for transverse limit rods with an inner diameter of 26mm are reserved every 500mm in the width direction.

[0040] The top of the transverse limiting rod 13 is lower than the top surface of the elastic shock-absorbing layer 11. In this embodiment, the transverse limiting rod 13 is 620 mm long, the top of the rod is 20 mm lower than the top surface of the elastic shock-absorbing layer 11, and Ø22 round steel bars are used.

[0041] In this embodiment, the solid slurry filler 15 is made of epoxy resin.

[0042] The edge of the bridge deck 6 at the abutment 20 is bent downward with a bending length of 70 mm. 18 mm round holes are opened every 300 mm in the bent part, and are connected to the vertical edge of the bridge deck limiter 10 through a vertical limiting rod 14; the vertical limiting rod 14 adopts an internal forced expansion anchor with a diameter of 16 mm.

[0043] The backfill material 3 behind the platform is medium-coarse sand with good gradation.

[0044] The construction process of the prefabricated slab structure behind the steel temporary bridge abutment of the present invention includes the following construction steps:

[0045] 1) The prefabricated scaffolding 4 is prefabricated in the factory. The single-box multi-chamber structure is formed by welding "I"-shaped parts. After the prefabricated scaffolding 4 is completed, it is rust-removed and painted with anti-corrosion paint;

[0046] 2) Pour concrete on the abutment corbel 9 and reserve holes for the transverse limit rods 12. Cover the reserved holes for the transverse limit rods 12 during the concrete curing period until the prefabricated slabs 4 are installed;

[0047] 3) Backfill the back of the platform to the design elevation of the bottom surface of the prefabricated slab 4, level the site, and construct the elastic leveling layer 13 on the abutment bracket 9;

[0048] 4) The prefabricated slab 4 is transported to the project site by car, installed in place by crane, and the hole positions of the prefabricated slab 4 and the transverse limit rod 12 of the abutment corbel 9 are adjusted and aligned;

[0049] 5) After injecting the solid slurry filler 15 into the hole of the transverse limiting rod 12, insert the transverse limiting rod 12;

[0050] 6) Install the elastic shock-absorbing layer 11, lay the steel bridge deck 6, install the vertical limit rods 14, backfill the remaining part behind the platform, and construct the road structure layer 2 and the road surface layer 1;

[0051] 7) After the use of the temporary road is completed, the road behind the platform is dismantled, and the scaffolding structure is dismantled in reverse order according to the installation sequence, and the prefabricated scaffolding 4 is recovered.

[0052] The above embodiment is only a preferred technical solution of the present invention. Those skilled in the art should understand that the structural type or technical solution in the embodiment can be modified or replaced without departing from the principle and essence of the present invention, and all should be included in the scope of protection of the present invention.

Claims

1. A prefabricated slab structure behind a steel temporary bridge pier, characterized by: An elastic leveling layer (13), a prefabricated slat (4), an elastic shock-absorbing layer (11), and a bridge deck (6) are sequentially arranged at the abutment bracket (9) from bottom to top; the prefabricated slat (4) includes a straight section (41) and a downward slope (42); the bracket is connected to the straight section and the elastic shock-absorbing layer (11) of the prefabricated slat (4) through a limiting structure; a bridge deck limiter (10) is arranged on the outer side of the elastic shock-absorbing layer (11) of the straight section (41) of the prefabricated slat (4); the bridge deck limiter (10) is connected to the bridge deck (6) through a vertical limiting structure; the lower portion of the downward slope (42) of the prefabricated slat (4) is filled with a backfill material (3), and the upper portion of the downward slope (42) of the prefabricated slat (4) is filled with a backfill material (3); The prefabricated slats (4) are prefabricated with steel and have a single-box multi-chamber structure in cross section. The slats are welded together to form a slat top, a bottom plate (17), a slat longitudinal rib (18), a slat buckle (16), and a bridge deck stopper (10). The prefabricated slats (4) are provided with the downward slope (42) at the portion other than the abutment bracket (9). Slat buckles (16) are provided on both sides of the prefabricated slats (4). The edge of the bridge deck (6) at the abutment (20) is bent downward, and the bridge deck limiter (10) is made of angle steel. The horizontal edge of the angle steel is welded to the top surface of the straight section (41), and the vertical edge of the angle steel is connected to the downward bent portion of the edge of the bridge deck (6) through a vertical limiting structure; the vertical limiting structure uses a rod for vertical limiting, and the vertical edge of the angle steel and the downward bent portion of the edge of the bridge deck (6) are provided with holes connected to the rod.

2. The prefabricated slab structure behind the steel temporary bridge pier according to claim 1 is characterized in that The prefabricated slats (4) are connected by transverse limiting rods (12) and corbels (9), and the elastic shock-absorbing layer (11) also has holes for the transverse limiting rods (12). The tops of the transverse limiting rods (12) are located in the elastic shock-absorbing layer (11), and the gaps between the prefabricated slats (4), the corbels (9) and the transverse limiting rods (12) are filled with solid slurry fillers (15).

3. The prefabricated slab structure behind the steel temporary bridge abutment according to claim 1, characterized in that The elastic leveling layer (13) is arranged between the abutment corbel (9) and the prefabricated slab (4) and is made of a rubber gasket or oil felt.

4. The prefabricated slab structure behind the steel temporary bridge abutment according to claim 1, characterized in that The elastic shock-absorbing layer (11) is arranged between the prefabricated slab (4) and the bridge deck (6) and is made of a rubber sheet.

5. The prefabricated slab structure behind the steel temporary bridge abutment as claimed in claim 2, characterized in that The transverse limiting rod (12) has a top elevation 2 to 3 cm lower than the top elevation of the elastic shock-absorbing layer (11), and is made of plain round steel bars.

6. The prefabricated slab structure behind the steel temporary bridge abutment as claimed in claim 2, characterized in that The solid slurry filler (15) is made of epoxy resin or hot-melt material.

7. The prefabricated slab structure behind the steel temporary bridge abutment according to claim 1, characterized in that The backfill material (3) behind the platform is graded medium-coarse sand or crushed stone.

8. A construction process for a prefabricated slab structure behind a temporary steel bridge abutment according to any one of claims 1 to 7, characterized in that The construction steps include: 1). The prefabricated slats (4) are prefabricated in the factory. The single-box multi-chamber structure is formed by welding "I"-shaped parts. After the prefabricated slats (4) are completed, they are rust-removed and painted with anti-corrosion paint; 2) The abutment corbel (9) is poured with concrete and holes for the transverse limit rods (12) are reserved. The holes for the transverse limit rods (12) are covered during the concrete curing period until the precast slab (4) is installed. 3) Backfill the area behind the abutment to the design elevation of the bottom surface of the prefabricated slab (4), level the site, and construct the abutment bracket (9) and elastic leveling layer (13); 4). The prefabricated slab (4) is transported to the project site by car and installed in place by crane, and the holes of the prefabricated slab (4) and the transverse limit rod (12) of the abutment bracket (9) are adjusted and aligned; 5) Inject the solid slurry filler (15) into the hole of the transverse limit rod (12) and then insert the transverse limit rod (12); 6). Install the elastic shock-absorbing layer (11), lay the steel bridge deck (6), install the vertical limit rod (14), backfill the remaining part behind the platform, and construct the road structure layer (2) and the road surface layer (1); After the use of the temporary road is completed, the road behind the platform is dismantled, and the scaffolding structure is dismantled in reverse order according to the installation sequence, and the prefabricated scaffolding (4) is recovered.

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