CN220908429U - Novel bridge bench back backfill structure - Google Patents
Novel bridge bench back backfill structure Download PDFInfo
- Publication number
- CN220908429U CN220908429U CN202322788819.6U CN202322788819U CN220908429U CN 220908429 U CN220908429 U CN 220908429U CN 202322788819 U CN202322788819 U CN 202322788819U CN 220908429 U CN220908429 U CN 220908429U
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- Prior art keywords
- bridge
- slope protection
- abutment
- backfill
- concrete
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- 230000002787 reinforcement Effects 0.000 claims abstract description 36
- 239000004677 Nylon Substances 0.000 claims abstract description 26
- 229920001778 nylon Polymers 0.000 claims abstract description 26
- 239000011381 foam concrete Substances 0.000 claims abstract description 21
- 239000010410 layer Substances 0.000 claims abstract description 17
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 11
- 239000010426 asphalt Substances 0.000 claims abstract description 7
- 239000002344 surface layer Substances 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 claims description 21
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 19
- 238000005187 foaming Methods 0.000 abstract description 9
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000004568 cement Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 229920006052 Chinlon® Polymers 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229920004934 Dacron® Polymers 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
The utility model provides a novel bridge bench back backfill structure, which solves the problem that obvious settlement exists at the bridge bench back. The bridge abutment, the foundation slope protection, the roadbed and a backfill area formed by encircling the bridge abutment, the foundation slope protection and the roadbed, wherein the cross section of the foundation slope protection is of a triangular reinforced concrete structure, the outer side of the foundation slope protection is an inclined plane, and the inner side of the foundation slope protection is a step; the backfill area is a conical space which is gradually enlarged from bottom to top, foam concrete is filled in the conical space, a plurality of layers of nylon nets are embedded in the foam concrete, a plurality of layers of constructional reinforcement cages are embedded in the foam concrete, a butt strap is arranged at the top of the foam concrete, one end of the butt strap is put on the bracket of the abutment, and an asphalt surface layer is arranged above the butt strap. The utility model makes up the problem of insufficient strength of the foaming concrete by constructing the combination of the reinforcement cage and the nylon net, and the nylon net is in a tensioning state, so that the pressure at the top can be uniformly dispersed, and the concentration of internal stress is avoided.
Description
Technical Field
The utility model relates to the technical field of bridge bench back backfill construction.
Background
The bridge bench back backfilling mostly adopts cement stabilized sand and lime stabilized soil to form a transition section between the bridge and the roadbed in a backfilling, layered tamping or layered compacting mode, and the cross section of the transition section is shown in fig. 1. At present, regarding the design of a transition section, the design is basically developed around the natural settlement of a backfill position, for example, ZL202121184317.7 literature discloses an anti-jump abutment back backfill structure, and the principle of the structure is that an abutment structure is arranged at the end part of an abutment structure of the transition section, the abutment structure is arranged on a roadbed after a bridge, and one end of the abutment structure, which is close to the abutment structure, is fixed on the connecting steel pipe. In fact, the existence of the access panel structure still causes the phenomenon of lower voids, and therefore, it is necessary to improve the water and soil holding capacity of the rammed layer below the access panel structure.
For example, in ZL202321082183.7 literature, disclose a settlement prevention structure of bridge and culvert and road bed linking section, set up reinforced concrete access panel between bridge and culvert support column and road bed, reinforced concrete access panel's length is 6-8 meters, and the bottom is provided with the bench back and backfills the district, and the bench back is backfilled the district and is including setting up the cement stabilization gravel layer in reinforced concrete access panel bottom. When subsidence occurs in the back backfill area, the pavement subbase layer can form a gentle slope between the bridge and culvert support columns and the roadbed, and the purpose of relieving the height difference formed by uneven subsidence of bridge and culvert genes and road genes is achieved.
The above methods are all solutions based on reinforced concrete access panels (structures).
Disclosure of utility model
In order to solve the defects in the prior art, the utility model provides a novel bridge bench backfill structure, which solves the problem that the bridge bench still has obvious sedimentation after a reinforced concrete access board is simply added in the prior art.
The technical scheme adopted for solving the technical problems is as follows:
Bridge abutment back backfill novel structure, including abutment, basis bank protection, road bed to and by the three enclose the backfill region of closing formation, its characterized in that: the section of the foundation slope protection is of a triangular reinforced concrete structure, the outer side of the foundation slope protection is an inclined plane, and the inner side of the foundation slope protection is a step;
The backfill area is a conical space which is gradually enlarged from bottom to top, foam concrete is filled in the conical space, a plurality of layers of nylon nets are embedded in the foam concrete, a plurality of layers of structural reinforcement cages are embedded in the foam concrete, a butt strap is arranged at the top of the foam concrete, one end of the butt strap is placed at the bracket of the abutment, and an asphalt surface layer is arranged above the butt strap.
Further, the edge of the nylon net is fixed at the bridge abutment and the basic slope protection by being tensioned by the metal battens.
Further, the constructional reinforcement cage is arranged along the transverse bridge direction, and two ends of the constructional reinforcement cage are respectively put on the foundation slope protection steps on two sides.
Further, the constructional reinforcement cage is arranged along the longitudinal bridge direction, one end of the constructional reinforcement cage is put on the roadbed step, and the other end of the constructional reinforcement cage is arranged on the abutment wall.
Further, the structural reinforcement cage is a triangular prism structure formed by welding three straight ribs and two split heads.
Further, the rope diameter and the mesh size of the nylon net are selected according to engineering practice.
Further, the arrangement clearance between the constructional reinforcement cages is not more than 1 meter.
The beneficial effects of the utility model are as follows:
The novel lightweight foamed concrete material is used as backfill, and tamping operation is not needed in the backfill process, so that adverse effects of the tamping operation on the bridge abutment are avoided.
The utility model makes up the problem of insufficient strength of the foaming concrete by constructing the combination of the reinforcement cage and the nylon net, and the nylon net is in a tensioning state, so that the pressure at the top can be uniformly dispersed, and the concentration of internal stress is avoided.
Drawings
Fig. 1 is a sectional view of a conventional construction structure.
Fig. 2 is a cross-sectional view (forward direction) of the present utility model.
Fig. 3 is a cross-sectional view (transverse bridging) of the present utility model.
Fig. 4 is a structural view of a construction reinforcement cage.
Fig. 5 is a graph of nylon mesh and abutment installation nodes.
In the figure:
00 foaming concrete;
01 abutment, 011 concrete corbel, 02 bridge plate, 03 foundation slope protection and 04 roadbed;
nylon net 10, anchor point 11;
20, 20' a reinforcement cage;
30 butt strap;
40 asphalt surface course.
Detailed Description
The implementation of the novel structure of bridge bench back backfill is different from the traditional construction technology, and the main materials used comprise light foamed concrete, nylon net, construction reinforcement cage (split heads reinforcement cage) and access board, wherein the construction reinforcement cage is a triangular prism structure formed by welding three straight ribs and split heads.
The lightweight foamed concrete in this embodiment is a foamed lightweight soil filling material disclosed in the prior art, for example, CN104961393a, and is prepared from industrial tailing quartz sand slag, cement, foaming agent and the like as raw materials by controlling the proportion of each component material. This embodiment is implemented by purchasing lightweight foamed concrete commodity.
The present embodiment will be described in detail with reference to fig. 1 to 5.
The bridge abutment 01 is of a reinforced concrete structure and has high rigidity, the bridge plate 02 is installed on the top of the bridge abutment through a support, and the back side of the bridge abutment is a backfill area. And the two sides of the backfill area are provided with basic revetments 03.
The steel plates are pre-buried when the foundation slope protection (concrete structure) of the back and the two sides of the construction station is used for forming an anchoring point, and three edges of the nylon net 10 are respectively fastened at the anchoring point 11 through angle steel pressing strips to form edge fixing. And in the fixing process, the tension state of the nylon net is maintained. The structural schematic of this anchor point is shown in fig. 5.
The specification of the nylon net is the best:
Material quality: nylon, dacron or chinlon;
mesh: 15cm by 15cm;
net rope diameter: 18mm;
Wherein, the rope diameter and the mesh size can be properly adjusted according to engineering practice.
And pouring the light foamed concrete 00 in a layer-by-layer pouring mode, paving and fastening a layer of nylon net 10 for each pouring layer, and constructing a construction steel reinforcement cage 20 above the nylon net, wherein the construction steel reinforcement cages are arranged in a transverse and longitudinal staggered mode, and the arrangement gap is not more than 1 meter. The length direction of the structural reinforcement cage is arranged along the longitudinal direction, one end of the reinforcement cage is put on the angle steel pressing strip, and the other end of the reinforcement cage is put on the excavation step of the roadbed 04 to form a structure with two ends supported.
Further, the paving gradient (longitudinal and transverse slopes) of each layer of nylon net should be consistent with the gradient of the road surface during construction.
Further, the nylon ropes in the nylon net are allowed to overlap, after being tensioned, the elongation is less than or equal to 1% under the longitudinal and transverse ultimate tensile strength,
The construction process of the novel bridge bench back backfill structure comprises the following steps:
S1, after construction of a supporting bridge abutment 01 for supporting a bridge is completed, the bottom of the supporting bridge abutment is a friction pile or a supporting pile, the supporting bridge abutment is of a reinforced concrete structure, a concrete bracket 011 is arranged at the top of the supporting bridge abutment, and the concrete bracket is used for installing a concrete access board 30 and a bridge board 02. In the process of supporting the bridge abutment formwork and pouring and forming, embedded steel plates are embedded layer by layer according to different elevations, for example, 20 cm. Step excavation is performed on the roadbed opposite to the supporting abutment, and the preferred dimensions (width and height) of the excavated step are 20cm×20cm, and the height corresponds to the elevation of the pre-buried steel plate.
S2, backfilling two sides of the section, and forming two concrete slope protection walls (also called foundation slope protection) in a splayed shape by outwards extending the self-supporting bridge abutment, wherein the outer sides of the concrete slope protection walls are inclined planes, the inner sides of the concrete slope protection walls are stepped, for example, the preferable dimensions (width and height) are 10cm multiplied by 20cm, and the steps are arranged at intervals with the steps on the supporting bridge abutment in the height direction.
S3, transversely paving a construction reinforcement cage 20', namely, overlapping two ends of the construction reinforcement cage at the steps of the two concrete slope protection walls, pouring light foamed concrete after paving, and stopping pouring at the previous elevation;
S4, fixing the edge of the nylon net 10 on the supporting abutment and the concrete slope protection wall body in a mode of angle steel pressing plates, tensioning and fixing. After fixing, building a construction reinforcement cage 20 (longitudinally) and a transverse reinforcement cage 20' (transversely) above the nylon net, and then pouring the light foamed concrete in a layer-by-layer pouring mode; and repeating the steps in sequence until pouring of the light foamed concrete 00 is completed. And after the completion, the elevation high point of the light foamed concrete casting is flush with the bracket.
And S5, placing a butt strap 30, which is a reinforced concrete precast slab, above the transition zone, and placing the precast slab on top of the transition zone.
And S6, after curing for 48 hours, paving the asphalt surface layer 40, and spreading asphalt oil before paving asphalt to form a waterproof layer.
Above-mentioned construction structures, light foaming concrete forms a reinforcement and organizational structure with constructional reinforcement cage and nylon wire inside, especially nylon wire forms the grid structure inside, forms the constraint to foaming concrete, can effectually solve inside fracture of light foaming concrete and shrink the expansion of crack for backfill structure has higher stability, alleviates abutment and the uneven problem of subsidence formation altitude difference of road bed.
And the structural reinforcement cage restrains the foaming concrete along the longitudinal direction and the transverse direction, and provides bending resistance on the horizontal plane, thereby improving the integral strength of the foaming concrete.
The foaming concrete in this embodiment need not to tamp the operation in the work progress, has avoided the adverse effect to the abutment in the tamping operation in-process.
The construction process and the structure after construction have no internal stress generated by the traditional earth tamping operation, and no external expansion force is generated on the supporting abutment of the abutment, so that the structure has more excellent stability.
The above examples are provided for illustrating the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and those skilled in the art should not depart from the spirit of the present utility model in all kinds of modifications and improvements that fall within the scope of the present utility model as defined in the appended claims.
Claims (6)
1. Bridge abutment back backfill novel structure, including abutment, basis bank protection, road bed to and by the three enclose the backfill region of closing formation, its characterized in that: the section of the foundation slope protection is of a triangular reinforced concrete structure, the outer side of the foundation slope protection is an inclined plane, and the inner side of the foundation slope protection is a step;
The backfill area is a conical space which is gradually enlarged from bottom to top, foam concrete is filled in the conical space, a plurality of layers of nylon nets are embedded in the foam concrete, a plurality of layers of structural reinforcement cages are embedded in the foam concrete, a butt strap is arranged at the top of the foam concrete, one end of the butt strap is placed at the bracket of the abutment, and an asphalt surface layer is arranged above the butt strap.
2. The novel bridge counter back backfill structure according to claim 1, wherein the edges of the nylon net are fixed at the bridge counter and the foundation slope protection by being tensioned by metal battens.
3. The novel bridge counter back backfill structure according to claim 2, wherein the structural reinforcement cages are arranged along the transverse bridge direction, and two ends of the structural reinforcement cages are respectively placed at the foundation slope protection steps on two sides.
4. The bridge counter back backfill novel structure according to claim 2, wherein the construction reinforcement cages are arranged along the longitudinal bridge direction, one ends of the construction reinforcement cages are placed at the roadbed steps, and the other ends of the construction reinforcement cages are installed at the abutment walls.
5. The novel bridge counter back backfill structure according to claim 1, wherein the structural reinforcement cage is a triangular prism structure formed by welding three straight ribs and split heads.
6. The bridge counter back backfill new structure of claim 1, wherein the placement gap between the build reinforcement cages is no more than 1 meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322788819.6U CN220908429U (en) | 2023-10-18 | 2023-10-18 | Novel bridge bench back backfill structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322788819.6U CN220908429U (en) | 2023-10-18 | 2023-10-18 | Novel bridge bench back backfill structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220908429U true CN220908429U (en) | 2024-05-07 |
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ID=90911851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322788819.6U Active CN220908429U (en) | 2023-10-18 | 2023-10-18 | Novel bridge bench back backfill structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220908429U (en) |
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2023
- 2023-10-18 CN CN202322788819.6U patent/CN220908429U/en active Active
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