Bridge head subgrade treatment structure and bridge head subgrade system

Abstract

The utility model discloses a bridge head roadbed treatment structure and bridge head roadbed system, the bridge head roadbed treatment structure, including transition module and drainage module, transition module is used as the transition structure between bridge head and roadbed, drainage module sets up in transition module and is used for excluding road surface seepage. The bridge head roadbed system includes bridge head roadbed treatment structure. Transition module satisfies the structural bearing capacity requirement of abutment, and makes the bridge head smooth transition to roadbed, reduces even eliminates the height difference at bridge head, is helpful to solve the bridge head bumping problem. On the basis of transition module, drainage module is constructed, and drainage module is used for excluding road surface seepage, guarantees the durability of bridge head, also is helpful to solve the settlement caused by roadbed seepage.

Description

Technical Field

[0001] This utility model relates to the field of roadbed structure technology, specifically to a bridge abutment roadbed treatment structure and a bridge abutment roadbed system. Background Technology

[0002] Bridge approach slab slab slab occupancy is a phenomenon caused by differential settlement at the bridge approach and expansion joints (bridge approach ramps), or by damage to the expansion joints, resulting in steps in the longitudinal slope of the road surface and causing vehicles to bounce when passing over them. The key to solving bridge approach slab slab slab occupancy is to ensure a smooth transition in the stiffness of the roadbed and pavement at the bridge approach from that of the normal roadbed and pavement. From a durability perspective, it is also necessary to pay attention to uneven settlement of the roadbed at the bridge approach due to water seepage in the pavement later on. Utility Model Content

[0003] The technical problem to be solved by this utility model is to ensure a smooth transition and waterproofing of the bridge approach road surface. The purpose is to provide a bridge approach roadbed treatment structure and a bridge approach roadbed system to solve the above-mentioned problems.

[0004] This utility model is achieved through the following technical solution:

[0005] In the first aspect, this utility model provides a bridge abutment roadbed treatment structure, including a transition module and a drainage module;

[0006] The transition module serves as a transition structure between the bridge abutment and the roadbed;

[0007] The drainage module is located in the transition module and is used to drain water from the road surface.

[0008] In one possible design, the transition module includes a layered structure and a support mesh. The layered structure consists of several layers stacked sequentially from bottom to top, with the drainage module located between the two topmost layered structures. The support mesh consists of at least two layers located between adjacent layered structures.

[0009] In one possible design, the layered structure includes, from bottom to top, a subgrade layer, a bridge approach road base layer, and a pavement layer;

[0010] The load-bearing net consists of an upper net and a lower net, which are installed at intervals above and below the roadbed surface at the bridgehead. Both the upper net and the lower net pass through the stepped structure and extend into the roadbed, with the upper net being longer than the lower net.

[0011] In one possible design, the bridgehead road base layer is covered with a closed impermeable geotextile, and protective walls are installed on both sides of the bridgehead road base layer.

[0012] The bridgehead road base is constructed with a stepped structure at one end facing the roadbed. The step structure is 0.8-1.2 meters long, 0.8-1.2 meters high, and no less than 1 meter wide, with a slope ratio of 1:1. The step surface has an inward-sloping reverse slope.

[0013] In one possible design, expansion joints are provided at equal intervals along the longitudinal direction of the bridgehead road base, and the expansion joints are filled with joint sealant.

[0014] In one possible design, the pavement layer includes a bridge approach slab, an intermediate structure, and a transition slab connected in sequence. The bridge approach slab is used to connect the bridge abutment, the transition slab is used to connect the roadbed, and the length of the transition slab extending to the bridge approach roadbed is not less than 2 meters. The intermediate structure is located in the construction joint between the bridge approach slab and the transition slab.

[0015] In one possible design, the intermediate structure includes tie rods, waterproof membrane, and wire mesh. Several tie rods are provided and spaced apart along the length of the construction joint. The waterproof membrane and wire mesh are installed at the joint between the bridge abutment slab and the transition slab.

[0016] In one possible design, the transition module includes a bridge approach slab, the bridge approach slab, the abutment back wall and the line connecting the two form a triangular area, and the drainage module includes a gravel layer set in the triangular area and a permeable pipe running through the gravel layer, with both ends of the permeable pipe extending out of the roadbed slope.

[0017] In one possible design, the drainage module also includes an impermeable geotextile for covering the bridge abutment road base, the impermeable geotextile including a drainage zone located in the triangular area, a gravel layer and permeable pipes set above the drainage zone.

[0018] Secondly, this utility model provides a bridge abutment roadbed system, including a roadbed and a bridge abutment, wherein the roadbed and the bridge abutment are connected by the bridge abutment roadbed treatment structure.

[0019] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0020] The transition module meets the structural bearing capacity requirements of the abutment and ensures a smooth transition from the bridgehead to the roadbed, reducing or even eliminating the elevation difference at the bridgehead and helping to solve the problem of vehicle slab settlement at the bridgehead. A drainage module is then constructed on top of the transition module to drain road surface seepage, ensuring the durability of the bridgehead and also helping to address settlement caused by roadbed seepage. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a structural schematic diagram of a bridge abutment roadbed system.

[0023] Figure 2 This is a schematic diagram of a bridge abutment subgrade treatment structure.

[0024] The attached diagram shows the markings and corresponding component names:

[0025] 1. Bearing net; 101. Top layer; 102. Bottom layer; 2. Plain soil layer; 3. Base layer; 4. Bridgehead road base layer; 5. Road surface layer; 501. Bridgehead approach slab; 502. Intermediate structure; 503. Transition slab; 6. Crushed stone layer; 7. Permeable pipe; 8. Impermeable geotextile; 9. Subgrade; 10. Bridgehead. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0027] Example:

[0028] like Figure 1 and Figure 2 As shown, in the first aspect, this utility model provides a bridge abutment roadbed treatment structure, including a transition module and a drainage module;

[0029] The transition module serves as a transition structure between the bridgehead 10 and the roadbed 9;

[0030] The drainage module is located in the transition module and is used to drain water from the road surface.

[0031] In the aforementioned bridge abutment subgrade treatment structure, a transition module is constructed at the bridge abutment excavation face. This transition module meets the structural bearing capacity requirements of the bridge abutment and ensures a smooth transition from bridge abutment 10 to subgrade 9, reducing or even eliminating the elevation difference at bridge abutment 10 and helping to resolve the issue of vehicle bouncing at bridge abutment 10. A drainage module is then constructed on top of the transition module. This drainage module is used to drain road surface seepage, ensuring the durability of bridge abutment 10 and also helping to resolve settlement caused by seepage from subgrade 9.

[0032] Based on this, the application of the aforementioned bridgehead roadbed treatment structure effectively solved the problem of vehicle bouncing at the bridgehead 10, allowing passing vehicles to pass smoothly.

[0033] In one possible implementation, the transition module includes a layered structure and a support net 1. The layered structure has several layers stacked sequentially from bottom to top, and the drainage module is located between the two uppermost layered structures. The support net 1 has at least two cells and is located between two adjacent layered structures.

[0034] Based on the above design scheme, the layered structure serves as the main structure of the transition module. Multiple layered structures not only backfill the excavated working face of the abutment but also cooperate to give the transition module a certain load-bearing capacity. The load-bearing net 1 can firmly bond with adjacent layered structures, forming a composite stress structure, dispersing the stress caused by uneven settlement, and enhancing the stability of the structure. Furthermore, the load-bearing net 1 is constructed as a three-dimensional structure, thereby limiting the lateral displacement of the layered structures, which helps to improve the load-bearing capacity of the transition module. It also evenly diffuses stress to the surrounding soil, avoiding stress concentration.

[0035] The drainage module is located on top of the transition module to drain water in a timely manner and effectively reduce the scope of water seepage, thus ensuring the service life of the transition module.

[0036] Optionally, the support mesh 1 can be made of galvanized steel wire mesh. Galvanizing improves the adaptability of the support mesh 1 to harsh environments and extends its service life.

[0037] In one possible implementation, the layered structure includes, from bottom to top, a subgrade layer 2, a base slab layer 3, a bridge approach road base layer 4, and a pavement layer 5;

[0038] The load-bearing net 1 includes an upper net 101 and a lower net 102 that are installed at intervals above and below the roadbed 9 at the bridgehead 10. Both the upper net 101 and the lower net 102 pass through the stepped structure and extend into the roadbed 9, with the upper net 101 being longer than the lower net 102.

[0039] Based on the above design scheme, the subgrade layer 2 is composed of backfilled subgrade, which can uniformly transfer loads, control settlement deformation, and isolate impurities to protect other layered structures. The bottom slab layer 3 is a concrete slab. By strengthening the mechanical properties of the layered structure through the bottom slab layer 3, it not only helps to transfer and distribute loads but also improves the deformation resistance. At the same time, the bottom slab layer 3 can also be used as a construction reference surface, improving the quality of the layered structure above the bottom slab layer 3. In addition, the bottom slab layer 3 can also isolate groundwater and impurities from erosion of the subgrade layer 2, regulate the moisture content of the subgrade, and reduce the risk of drying shrinkage cracks.

[0040] The bridgehead road base layer 4 is preferably made of lightweight foamed concrete, which can effectively reduce the structural weight and reduce the pressure on the underlying layered structure; the porosity of lightweight foamed concrete is 50%-80%, providing excellent heat insulation, waterproofing and sound insulation performance, and improving the sound insulation effect of the transition module; lightweight foamed concrete is easy to construct and helps to shorten the construction period.

[0041] The road surface layer 5 is flush with the bridge deck and road surface to avoid creating step-like bumps due to height differences.

[0042] Due to its structural characteristics, the bridgehead road base layer 4 is evenly distributed by the bearing net 1 to disperse the tensile stress generated during its solidification, control the width of shrinkage cracks, improve crack resistance, and also strengthen the connection performance between the bridgehead road base layer 4 and other layered structures. This helps to form a composite structure and improve the load-bearing capacity. The overall integrity of the layered structure is better, and it avoids the phenomenon of delamination and voids between adjacent layered structures.

[0043] In addition, multiple layers can be set up for the Internet 101 and the Internet 102 if necessary to improve the effectiveness of the bearer network 1.

[0044] In one possible implementation, the bridgehead road base 4 is covered with a closed impermeable geotextile 8, and protective walls are provided on both sides of the bridgehead road base 4.

[0045] The bridgehead road base 4 facing the roadbed 9 has a stepped structure at one end. The step structure is 0.8-1.2 meters long, 0.8-1.2 meters high, and not less than 1 meter wide, with a slope ratio of 1:1. The step surface has an inward sloping reverse slope.

[0046] Based on the above design scheme, and considering the porosity of lightweight foamed concrete, the bridge abutment road base 4 is sealed by covering it with impermeable geotextile 8 to improve its waterproof performance and ensure its long-term stability. Protective wall supports are used to stabilize the bridge abutment road base 4, while also reducing slope height and workload.

[0047] The stepped structure helps to increase the contact area and friction between the transition module and the roadbed 9, thereby improving the stability of the connection between the transition module and the roadbed 9. At the same time, the stepped structure also helps to ensure the compaction effect of the layered structure, making the compaction more uniform and helping to improve the construction quality. In addition, the stepped structure forms a temporary drainage channel, reducing the erosion of the roadbed 9 by rainwater.

[0048] It is easy to understand that the dimensions of the stepped structure can be selected within a given range to better adapt to the actual use environment.

[0049] In one possible implementation, expansion joints are provided at equal intervals along the longitudinal direction of the bridge abutment road base 4, and these joints are filled with joint sealant. Based on this, the expansion joints are used to cope with the deformation of the bridge abutment road base 4 due to expansion, settlement, etc., helping to protect the bridge abutment road base 4. The joint sealant serves as a buffer, waterproofing, and structural protection material; it can be made of foam plastic board or any other suitable existing material.

[0050] In one possible implementation, the pavement layer 5 includes a bridge approach slab 501, an intermediate structure 502, and a transition slab 503 connected in sequence. The bridge approach slab 501 is used to connect the bridge abutment, the transition slab 503 is used to connect the roadbed 9, and the length of the transition slab 503 extending to the bridge approach roadbed 4 is not less than 2 meters. The intermediate structure 502 is located in the construction joint between the bridge approach slab 501 and the transition slab 503.

[0051] Based on the above design scheme, the approach slab 501 and transition slab 503 are located at the top of the layered structure and will be in direct contact with the outside world, such as vehicles passing through. Therefore, both are made of materials with good load-bearing capacity to meet traffic requirements. Optionally, the approach slab 501 is constructed of a 35 cm thick C35 concrete slab, and the transition slab 503 is constructed of a 35 cm thick C30 concrete slab. Alternatively, any other suitable materials can be used for the approach slab 501 and transition slab 503.

[0052] To prevent differential settlement from occurring, the transition plate 503 extends to the bridgehead road base 4 by a length of not less than 2 meters. Furthermore, those skilled in the art can select the specific length based on the specific usage environment; this utility model does not impose any limitations in this regard.

[0053] The approach slab 501 and the transition slab 503 are connected by an intermediate structure 502, which is used to maintain the smoothness of the road surface, achieve a smooth transition, avoid the phenomenon of vehicle bouncing at the approach 10, and improve the comfort of vehicle passage. In addition, the intermediate structure 502 can also absorb the small deformations caused by the dynamic load of vehicles, reducing the rigid impact between the approach slab 501 and the transition slab 503.

[0054] In one possible implementation, the intermediate structure 502 includes tie rods, waterproof membrane, and wire mesh. Several tie rods are provided and spaced apart along the length of the construction joint. The waterproof membrane and wire mesh are provided at the joint between the bridge approach slab 501 and the transition slab 503.

[0055] Based on the above design scheme, the tie rods connect and restrict misalignment, and also disperse load stress to avoid local stress concentration, thereby restraining deformation and maintaining the smoothness of pavement layer 5. The waterproof membrane is used for waterproofing, protecting the layered structure, and improving the stability of pavement layer 5. The wire mesh can disperse the load, improve the compressive and deformation resistance of the intermediate structure 502, enhance the load-bearing capacity, and, in conjunction with the waterproof membrane, promote drainage.

[0056] It is easy to understand that the intermediate structure 502 can be constructed as any suitable existing structure, or any suitable existing model can be selected, and those skilled in the art can choose according to the actual working environment.

[0057] In one possible implementation, the transition module includes a bridge approach slab 501, the bridge approach slab 501, the abutment back wall and the line connecting the two form a triangular area, and the drainage module includes a gravel layer 6 set in the triangular area and a permeable pipe 7 passing through the gravel layer 6, with both ends of the permeable pipe 7 extending out of the roadbed slope.

[0058] Based on the above design scheme, the location of the drainage module avoids critical load-bearing areas, follows the drainage path of the bridgehead 10, and balances drainage efficiency, structural safety and maintenance convenience.

[0059] The crushed stone layer 6 effectively disperses external loads through contact and friction between the crushed stone particles, reducing the stress directly acting on the permeable pipe 7 and lowering the risk of the permeable pipe 7 rupture. The crushed stone layer 6 has high permeability, allowing pavement seepage water to quickly flow into the permeable pipe 7, reducing rainwater retention time. The permeable pipe 7, used in conjunction with the crushed stone layer 6, achieves efficient drainage, rapidly reducing rainwater retention time.

[0060] In one possible implementation, the drainage module also includes an impermeable geotextile 8 for covering the bridge abutment road base 4. The impermeable geotextile 8 includes a drainage zone located in the triangular area, with a crushed stone layer 6 and a permeable pipe 7 disposed above the drainage zone.

[0061] Based on the above design scheme, waterproofing is achieved through impermeable geotextile 8, preventing rainwater from seeping into the layered structure below the bridgehead road base 4 and protecting the transition module. At the same time, the impermeable geotextile arch fabric guides the flow of rainwater, causing it to converge in the triangular area and be quickly discharged.

[0062] Secondly, this utility model provides a bridge abutment subgrade system, including a subgrade 9 and a bridge abutment 10, with the subgrade 9 and bridge abutment 10 connected by the aforementioned bridge abutment subgrade treatment structure. Based on this, the bridge abutment subgrade system can also include other suitable functional modules on the basis of the aforementioned bridge abutment subgrade treatment structure, resulting in richer functionality to meet different operational requirements and improved practicality. Furthermore, it is readily understood that the functional modules can be any suitable existing equipment, offering a wide range of choices.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A bridge abutment subgrade treatment structure, characterized in that, Includes transition modules and drainage modules; The transition module serves as a transition structure between the bridge abutment (10) and the roadbed (9); The drainage module is installed in the transition module and is used to drain water from the road surface. The transition module includes a layered structure and a support net (1). The layered structure is provided in several layers and stacked sequentially from bottom to top, and the drainage module is located between the two uppermost layered structures. The support net (1) has at least two grids and is located between two adjacent layered structures. The layered structure includes, from bottom to top, a soil layer (2), a base slab layer (3), a bridgehead road base layer (4), and a pavement layer (5); The load-bearing net (1) includes an upper net (101) and a lower net (102) that are installed in the roadbed (9) at the bridgehead (10) and are spaced one above the other. Both the upper net (101) and the lower net (102) pass through the stepped structure and extend into the roadbed (9), and the upper net (101) is longer than the lower net (102). The bridgehead road base (4) is covered with a closed impermeable geotextile (8), and protective walls are provided on both sides of the bridgehead road base (4); The bridgehead road base (4) is constructed with a stepped structure at one end facing the roadbed (9). The step structure is 0.8-1.2 meters long, 0.8-1.2 meters high, and not less than 1 meter wide. The slope ratio is 1:

1. The step surface is provided with an inwardly inclined reverse slope. The pavement layer (5) includes a bridge approach slab (501), an intermediate structure (502) and a transition slab (503) connected in sequence. The bridge approach slab (501) is used to connect the bridge abutment, the transition slab (503) is used to connect the roadbed (9), and the length of the transition slab (503) extending to the bridge approach roadbed (4) is not less than 2 meters. The intermediate structure (502) is located in the construction joint between the bridge approach slab (501) and the transition slab (503). The intermediate structure (502) includes tie rods, waterproof membrane and steel wire mesh. Several tie rods are provided and spaced apart along the length of the construction joint. The waterproof membrane and steel wire mesh are provided at the joint between the bridge approach slab (501) and the transition slab (503). The transition module includes a bridge approach slab (501), the bridge approach slab (501), the abutment back wall and the line connecting the two form a triangular area, and the drainage module includes a gravel layer (6) set in the triangular area and a permeable pipe (7) running through the gravel layer (6), with both ends of the permeable pipe (7) extending out of the roadbed slope. The drainage module also includes an impermeable geotextile (8) for covering the bridge approach road base (4), the impermeable geotextile (8) includes a drainage zone located in the triangular area, a crushed stone layer (6) and a permeable pipe (7) set above the drainage zone.

2. The bridge abutment subgrade treatment structure according to claim 1, characterized in that, Expansion joints are provided at equal intervals along the longitudinal direction of the bridgehead road base (4), and the expansion joints are filled with joint filler boards.

3. A bridge abutment roadbed system, characterized in that, It includes a roadbed (9) and a bridgehead (10), and the roadbed (9) and the bridgehead (10) are connected by the bridgehead roadbed treatment structure described in claim 1 or 2.

Images