Bridge substructure lateral displacement resisting device and method

Abstract

The invention belongs to the technical field of bridge auxiliary construction, and discloses a bridge substructure lateral displacement resisting device and method.The bridge substructure lateral displacement resisting device comprises an anti-sliding anchoring body and a tension assembly, through the synergistic effect of the anti-sliding anchoring body and the tension assembly, lateral soil extrusion force is effectively resisted, and the anti-sliding anchoring body is buried in a deeper soil layer close to one side of a bridge and on the lower portion; a sufficient contact area is formed between the anti-sliding anchoring body and the surrounding soil body, the effective anti-sliding anchoring body is constructed, and reliable lateral shearing resistance is provided. One end of an inhaul cable in the tension assembly is anchored to an anti-sliding anchoring body, the other end of the inhaul cable is connected to a bearing platform and penetrates through a pre-buried pipeline, the pre-buried pipeline ensures smooth force transmission of the inhaul cable, and meanwhile disturbance to surrounding soil or damage to the inhaul cable in the tensioning process is avoided; by applying adjustable tensioning force, lateral thrust borne by the bearing platform is actively transmitted to the anti-sliding anchoring body through the inhaul cable, control over horizontal displacement of the bearing platform is achieved, the device is simple in overall structure and convenient and fast to construct, the construction period is remarkably shortened, and the engineering cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge auxiliary construction, and in particular to a device and method for resisting lateral displacement of a bridge substructure. Background Art

[0002] As my country's expressway network continues to improve, more and more expressway routes are required to traverse areas of shallow, thick, and fluid soft soil. This refers to an extremely soft soil layer shallowly below the surface, characterized by low strength, high moisture content, high compressibility, poor permeability, and excellent fluidity. Under external disturbance, it is prone to slippage, soil surge, and lateral extrusion. In these areas, roadbeds and bridges are often located adjacent to each other. Because newly filled roadbeds on weak foundations experience significant settlement and lateral rheological effects, conventional construction methods generally involve constructing the roadbed first, then constructing the bridge substructure (pile foundation and cap) after its settlement stabilizes. This prevents horizontal extrusion of the bridge foundation from lateral earth pressure and displacement effects generated during the filling process.

[0003] If the bridge substructure is an existing one, it must be reinforced before filling. However, such reinforcement projects are long, complex, and costly, making them particularly challenging when the project schedule is tight. If the bridge substructure is newly constructed at the same time as the roadbed, construction must still be organized in the order of roadbed first, then bridge. However, in soft soil areas, there are many uncertainties: the duration of the roadbed settlement process is difficult to accurately predict, and factors such as changes in groundwater pressure and pore water seepage during the settlement process can significantly increase the difficulty and risk of subsequent bridge foundation construction, delaying the overall construction schedule and increasing the project cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for resisting lateral displacement of the bridge substructure, which can effectively control the lateral displacement problem of the bridge substructure caused by the lateral extrusion pressure generated by the newly built fill roadbed in shallow buried thick fluidized soft soil geological areas; it has the advantages of simple structure, convenient construction and good economy, can significantly shorten the construction period, reduce engineering costs, and effectively improve the structural safety and durability of bridge operation.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The bridge substructure anti-lateral displacement device includes a pile foundation and a cap, the cap is arranged at the top of the pile foundation, and the pile foundation is anchored in the lower soil layer on one side of the newly filled roadbed. The bridge substructure anti-lateral displacement device includes:

[0007] An anti-sliding anchor body is buried in the lower soil layer of the new roadbed near the bridge side and arranged relative to the lower structure of the bridge, and is used as an anti-sliding anchor foundation. The anti-sliding anchor body forms a shear resistance with the surrounding soil to resist lateral horizontal thrust;

[0008] The tension component includes a cable and a pre-buried pipe. One end of the pre-buried pipe is arranged in the pedestal, and the other end extends and is fixed to the lower end of the anti-slip anchor body. The cable runs through the pre-buried pipe, and its anchoring end is anchored to the anti-slip anchor body. Its tensioning end is connected to the pedestal and is in a tensioned state. The tensioning force of the cable is adjustable and is used to transfer the lateral thrust exerted on the pedestal to the anti-slip anchor body.

[0009] Furthermore, the tension component also includes a tensioning adjustment member, which is arranged on the support platform, and the output end of the tensioning adjustment member is connected to the cable to adjust the tensioning degree of the cable.

[0010] Furthermore, the tensioning adjustment member is a tensioning jack.

[0011] Furthermore, the cables are bundled with low-relaxation steel strands.

[0012] Furthermore, the exterior of the cable is wrapped with an anti-corrosion layer.

[0013] Furthermore, the tension components are arranged along the horizontal direction of the cap toward the new roadbed.

[0014] Furthermore, the anchoring end of the tension component is higher than the tensioning end of the tension component.

[0015] Furthermore, a plurality of the tension components are arranged side by side on the foundation block at intervals along the extension direction of the new roadbed, and each of the tension components corresponds to one of the anti-slip anchor bodies.

[0016] Furthermore, the tension component also includes a diagonal brace cable, one end of which is fixedly connected to the embedded pipe arranged on the base, and the other end is arranged obliquely in a direction away from the embedded pipe and fixedly connected to the anti-slip anchor body corresponding to the tension component.

[0017] A method for resisting lateral displacement of a bridge substructure, using any of the above-mentioned devices for resisting lateral displacement of a bridge substructure, comprises the following steps:

[0018] S1: After the construction of the bridge substructure is completed, the pre-buried pipe is buried inside the pedestal to guide the cable to be laid through;

[0019] S2: Before the subsequent construction of the new roadbed, the anti-sliding anchor body is buried in the lower soil layer of the new roadbed near the bridge side and arranged relative to the lower structure of the bridge;

[0020] S3: inserting the cable into the pre-buried pipe, anchoring the anchor end of the cable to the anti-slip anchor body, and connecting the tension end of the cable to the cap;

[0021] S4: After the new roadbed is filled, the cable is tensioned to keep the cable in a tensioned state to form a tension structure that resists lateral extrusion force;

[0022] S5: When the cable becomes loose or the platform undergoes slight lateral displacement in the later stage, the tensioning force can be adjusted at the tensioning end of the cable to re-tension the cable and restore the overall lateral resistance.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a device and method for resisting lateral displacement of a bridge substructure, comprising an anti-slip anchor and a tension assembly. The anti-slip anchor and the tension assembly work together to effectively resist lateral soil extrusion. The anti-slip anchor is buried in a stable soil layer deep below and close to one side of the bridge. This soil layer is far from the concentrated action area of ​​lateral pressure from the newly filled roadbed. The soil has small lateral deformation and high strength, which is conducive to forming a sufficient contact area between the anti-slip anchor and the surrounding soil, thereby constructing an effective anti-slip anchor and providing reliable lateral shear resistance. One end of the cable in the tension assembly is anchored to the anti-slip anchor, and the other end is connected to the pedestal. The cable runs through a pre-buried pipe, which ensures smooth force transmission of the cable while avoiding disturbance of the surrounding soil or damage to the cable during tensioning. By applying an adjustable tensioning force, the cable actively transmits the lateral thrust exerted on the pedestal to the anti-slip anchor, thereby controlling the horizontal displacement of the pedestal. In addition, considering that the cables may become loose due to long-term stress or slight displacement of the pedestal during operation, the tensioning force of the cables can be readjusted to perform re-tensioning operations when necessary to restore and maintain the overall lateral resistance of the system and ensure the long-term stability and durability of the bridge structure. The overall structure is simple and the construction is convenient, which significantly shortens the construction period and reduces project costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of the anti-lateral displacement device of the bridge substructure in the present invention;

[0026] Figure 2 is a top view of the bridge substructure anti-lateral displacement device of the present invention;

[0027] Figure 3 It is a flow chart of the method for resisting lateral displacement of the bridge substructure in the present invention.

[0028] In the picture:

[0029] 100. Bridge substructure; 101. Pile foundation; 102. Capping platform;

[0030] 200, new roadbed; 300, old roadbed;

[0031] 1. Anti-slip anchor; 2. Tension component; 21. Anchor end; 22. Tension end; 3. Diagonal bracing cable. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0033] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0036] Please refer to Figures 1 to 2As shown, this embodiment provides a bridge substructure anti-lateral displacement device, including an anti-sliding anchor body 1 and a tension component 2, wherein the bridge substructure 100 includes a pile foundation 101 and a cap 102, the cap 102 is arranged at the top of the pile foundation 101, the pile foundation 101 is anchored in the lower soil layer on one side of the new roadbed 200, the new roadbed 200 is arranged on one side of the old roadbed 300 and is adjacent to the bridge substructure 100, the anti-sliding anchor body 1 is buried in the lower soil layer of the new roadbed 200 close to the bridge side and is located at the same position as the bridge substructure 100. The arrangement is used as an anti-slip anchor foundation, and shear resistance is formed between the anti-slip anchor body 1 and the surrounding soil to resist lateral horizontal thrust; the tension component 2 includes a cable and a pre-buried pipe, one end of the pre-buried pipe is arranged in the base 102, and the other end extends and is consolidated to the lower end of the anti-slip anchor body 1. The cable runs through the pre-buried pipe, and its anchor end 21 is anchored to the anti-slip anchor body 1, and its tensioning end 22 is connected to the base 102 and is in a tensioned state. The tensioning force of the cable is adjustable, and is used to transfer the lateral thrust exerted on the base 102 to the anti-slip anchor body 1.

[0037] Under the conditions of newly built fill roadbed, especially in shallow buried thick soft soil areas in a fluidized state (such as silt or silty soil), the fill weight and subsequent vehicle loads will generate significant lateral soil pressure at the abutment, which can easily cause horizontal displacement of the bridge substructure 100. To this end, the present device effectively resists this type of lateral extrusion force through the synergistic effect of the anti-slip anchor body 1 and the tension component 2. Specifically, the anti-slip anchor body 1 is buried in a stable soil layer deep below the side of the bridge. This soil layer area is far away from the concentrated action area of ​​the lateral pressure of the new fill roadbed 200. The lateral deformation of the soil is small and the strength is high, which is conducive to the formation of sufficient contact area between the anti-slip anchor body 1 and the surrounding soil, thereby constructing an effective anti-slip anchor body 1 and providing reliable lateral shear resistance. One end of the cable in the tension component 2 is anchored to the anti-slip anchor body 1, and the other end is connected to the pedestal 102 and runs through the pre-buried pipe. The pre-buried pipe ensures that the cable can transmit force smoothly while avoiding disturbance to the surrounding soil or damage to the cable during the tensioning process. By applying an adjustable tensioning force, the cable actively transmits the lateral thrust exerted on the pedestal 102 to the anti-slip anchor body 1, thereby controlling the horizontal displacement of the pedestal 102. In addition, considering that the cable may become loose due to long-term stress or slight displacement of the pedestal 102 during operation, the tensioning force of the cable can be readjusted when necessary to perform a re-tensioning operation to restore and maintain the overall lateral resistance of the system and ensure the long-term stability and durability of the bridge structure.

[0038] In summary, the bridge substructure anti-lateral displacement device can effectively control the lateral displacement problem of the bridge substructure 100 caused by the lateral extrusion pressure generated by the newly built fill roadbed in the shallow buried thick fluidized soft soil geological area; with the advantages of simple structure, convenient construction and good economy, it can significantly shorten the construction period and reduce project costs.

[0039] For example, the anti-slip anchor 1 can be, but is not limited to, a slide plate or a slide pile, etc., which are not specifically limited here. The slide plate is a plate-like structure that forms a larger contact area with the surrounding soil, creating stronger lateral shear resistance, and utilizing the friction resistance at the soil-structure interface and the lateral resistance of the soil to resist horizontal extrusion force.

[0040] In some optional embodiments, the tension assembly 2 further includes a tensioning adjustment member disposed on the cap 102. The output end of the tensioning adjustment member is connected to the cable to adjust the tension of the cable. The tensioning adjustment member can further achieve fine adjustment of the cable tension, allowing the cable to actively adapt to the force adjustment requirements caused by soft soil settlement or changes in lateral earth pressure, thereby effectively ensuring the stability of the structure. Furthermore, since the cap 102 is located on or near the ground, the tensioning adjustment member can be conveniently operated on the ground during the construction phase, with precise positioning and high adjustment efficiency, which is conducive to improving construction convenience and installation quality. Furthermore, as the cap 102 is a key load-bearing node of the bridge substructure 100, the placement of the tensioning adjustment member there can more quickly and directly respond to structural displacement. When slight displacement or cable slack occurs, the tensioning force can be promptly corrected through the adjustment device, avoiding cumulative deformation or damage to the structure and further improving the responsiveness and durability of the device.

[0041] Exemplarily, the tensioning adjustment member may be, but is not limited to, a tensioning jack, which is not specifically limited here.

[0042] Optionally, the cables are bundled with low-relaxation steel strands, wherein the stress relaxation rate of low-relaxation steel strands under long-term loads is significantly lower than that of ordinary steel strands, and they can maintain the initial tension for a long time, have excellent fatigue resistance, avoid cable relaxation failure, ensure the continuous and effective lateral resistance of the structure, and effectively reduce the maintenance frequency and the number of re-tensioning times; the use of a bundled structure can flexibly configure the tension level, and the tension is evenly distributed, making construction and adjustment more convenient, so as to adapt to the layout requirements of various bridge structures and different lateral load conditions.

[0043] Since the cable is in a corrosive environment such as humidity, high salt, acid and alkali for a long time, it is very easy to rust. To solve the above problem, in some embodiments, the outside of the cable is wrapped with an anti-corrosion layer, which can effectively block the intrusion of external moisture, oxygen and harmful media, significantly improve the corrosion resistance of the cable, and protect the core load-bearing components.

[0044] In some embodiments, the tension component 2 is arranged in the horizontal direction along the pedestal 102 toward the new roadbed 200. Since the lateral extrusion force generated by the new roadbed 200 on the pedestal 102 mainly acts in the horizontal direction, the tension component 2 is arranged along this direction to directly resist the main direction load and achieve the optimal mechanical response. In addition, the tension component 2 connects the pedestal 102 and the anti-slip anchor body 1. The horizontal arrangement allows the internal force of the structure to be closed along the shortest path, which complies with the principle of shortest structural force flow and reduces the risk of stress concentration and local damage inside the component.

[0045] like Figure 1 As shown, further, the anchoring end 21 of the tension component 2 is higher than the tensioning end 22 of the tension component 2, so that the cable is arranged in a pre-buried pipe with a slope, so that water will not accumulate inside the pre-buried pipe, which facilitates the natural discharge of rainwater, condensation water or groundwater, and reduces the risk of corrosion of the cable due to water vapor retention.

[0046] In some optional embodiments, multiple tension components 2 are arranged side by side at intervals along the extension direction of the new roadbed 200 on the pedestal 102, and each tension component 2 is arranged in the horizontal direction of the pedestal 102 toward the new roadbed 200, and each tension component 2 corresponds to an anti-slip anchor body 1; wherein the multiple tension components 2 are arranged side by side at intervals along the extension direction of the new roadbed 200 to form a distributed resistance system. When the overall lateral thrust generated by the new roadbed 200 is applied, the multiple tension components 2 and the anti-slip anchor body 1 jointly bear and coordinately adjust the force, effectively avoiding excessive force on a single anti-slip anchor body 1, reducing the risk of single-point stress concentration, and improving the overall stability of the structure.

[0047] Since the tension component 2 is mainly subjected to force in the horizontal direction, when the lateral soil pressure of the foundation increases, the soft soil settles unevenly, or the structure is subjected to asymmetric force, there may be a tendency for the structure to shift or become unstable and swing. In order to further enhance the stability of the tension component 2, such as Figure 2 As shown, in some embodiments, the tension component 2 also includes a diagonal brace cable 3, one end of which is fixedly connected to the embedded pipe arranged on the base 102, and the other end is arranged obliquely in the direction away from the embedded pipe, and is fixedly connected to the anti-slip anchor body 1 corresponding to the tension component 2; wherein, the diagonal brace cable 3 is arranged obliquely, forming a spatial triangular support mechanism with the cable and the anti-slip anchor body 1, effectively suppressing the displacement and overturning risk; and the tension component 2 no longer relies solely on the unidirectional cable to transmit force, and can divert part of the force to the oblique channel, thereby reducing the force pressure on the main cable and avoiding excessive tension or fatigue failure.

[0048] like Figure 3 As shown, this embodiment also provides a method for resisting lateral displacement of a bridge substructure, which uses the bridge substructure anti-lateral displacement device in any of the above embodiments, and includes the following steps:

[0049] S1: After the construction of the bridge substructure 100 is completed, a pre-buried pipe is buried inside the pedestal 102 to guide the cable routing;

[0050] S2: Before the subsequent construction of the new roadbed 200, the anti-sliding anchor body 1 is buried in the lower soil layer of the new roadbed 200 near the bridge side and arranged relative to the bridge substructure 100;

[0051] S3: inserting the cable into the pre-buried pipe, anchoring the anchor end 21 of the cable to the anti-slip anchor body 1, and connecting the tension end 22 to the cap 102;

[0052] S4: After the new roadbed 200 is filled, the cables are tensioned to keep them in a tensioned state, forming a tension structure that resists lateral squeezing force;

[0053] S5: When the cable becomes loose or the platform 102 undergoes a slight lateral displacement in the later stage, the tensioning force can be adjusted at the tensioning end 22 of the cable to re-tension the cable and restore the overall lateral resistance.

[0054] This method for resisting lateral displacement of a bridge substructure effectively resists lateral soil extrusion through the synergistic action of an anti-slip anchor 1 and a tension assembly 2. The anti-slip anchor 1 is buried in a stable soil layer deep below the bridge, near one side. This soil layer is located away from the concentrated lateral pressure of the newly filled roadbed 200. The soil has low lateral deformation and high strength, which facilitates sufficient contact area between the anti-slip anchor 1 and the surrounding soil, thereby constructing an effective anti-slip anchor 1 and providing reliable lateral shear resistance. The cable in the tension assembly 2 is anchored to the anti-slip anchor 1 at one end and connected to the pedestal 102 at the other end. The cable runs through a pre-buried conduit, which ensures smooth force transmission while preventing disturbance of the surrounding soil or damage to the cable during tensioning. By applying an adjustable tensioning force, the cable actively transmits the lateral thrust exerted on the pedestal 102 to the anti-slip anchor 1, thereby controlling the horizontal displacement of the pedestal 102. In addition, considering that the cables may become loose due to long-term stress or slight displacement of the pier 102 during operation, the tensioning force of the cables can be readjusted to perform re-tensioning operations when necessary to restore and maintain the overall lateral resistance of the system and ensure the long-term stability and durability of the bridge structure.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A bridge substructure anti-lateral displacement device, wherein the bridge substructure (100) includes a pile foundation (101) and a cap (102), wherein the cap (102) is arranged at the top of the pile foundation (101), and the pile foundation (101) is anchored to the lower soil layer on one side of a newly filled roadbed (200), characterized in that: The bridge substructure anti-lateral displacement device includes: An anti-sliding anchor body (1) is buried in the lower soil layer of the new roadbed (200) near the bridge side and arranged relative to the bridge substructure (100) to serve as an anti-sliding anchor foundation. Shear resistance is formed between the anti-sliding anchor body (1) and the surrounding soil to resist lateral horizontal thrust. A tension component (2) includes a cable and a pre-buried pipe, one end of the pre-buried pipe is arranged in the support platform (102), and the other end thereof extends and is fixed to the lower end of the anti-slip anchor body (1). The cable passes through the pre-buried pipe, and its anchoring end (21) is anchored to the anti-slip anchor body (1). Its tensioning end (22) is connected to the support platform (102) and is in a tensioned state. The tensioning force of the cable is adjustable and is used to transmit the lateral thrust exerted on the support platform (102) to the anti-slip anchor body (1).

2. The bridge substructure anti-lateral displacement device according to claim 1, characterized in that: The tension component (2) further comprises a tensioning adjustment member, which is arranged on the support platform (102), and the output end of the tensioning adjustment member is connected to the cable to adjust the tensioning degree of the cable.

3. The bridge substructure anti-lateral displacement device according to claim 2, characterized in that: The tensioning adjustment member is a tensioning jack.

4. The bridge substructure anti-lateral displacement device according to claim 3, characterized in that: The cables are bundled with low-relaxation steel strands.

5. The bridge substructure anti-lateral displacement device according to claim 4, characterized in that: The exterior of the cable is wrapped with an anti-corrosion layer.

6. The bridge substructure anti-lateral displacement device according to claim 1, characterized in that: The tension component (2) is arranged in a horizontal direction from the bearing platform (102) toward the new roadbed (200).

7. The bridge substructure anti-lateral displacement device according to claim 6, characterized in that: The anchoring end (21) of the tension component (2) is higher than the tensioning end (22) of the tension component (2).

8. The bridge substructure anti-lateral displacement device according to claim 7, characterized in that: A plurality of tension components (2) are arranged side by side on the support platform (102) at intervals along the extension direction of the new roadbed (200), and each tension component (2) corresponds to one anti-slip anchor body (1).

9. The bridge substructure anti-lateral displacement device according to claim 8, characterized in that: The tension component (2) further comprises a diagonal bracing cable (3), one end of which is fixedly connected to the embedded pipe arranged on the support platform (102), and the other end of which is arranged obliquely in a direction away from the embedded pipe and fixedly connected to the anti-slip anchor body (1) corresponding to the tension component (2).

10. A method for resisting lateral displacement of a bridge substructure, characterized in that: Adopting the bridge substructure anti-lateral displacement device according to any one of claims 1 to 9, The following steps are involved: S1: After the construction of the bridge substructure (100) is completed, the pre-buried pipe is buried inside the foundation (102) to guide the cable to be laid through; S2: Before the subsequent construction of the new roadbed (200), the anti-sliding anchor body (1) is buried in the lower soil layer of the new roadbed (200) close to the bridge side and arranged relative to the bridge substructure (100); S3: inserting the cable into the pre-buried pipe, anchoring the anchor end (21) of the cable to the anti-slip anchor body (1), and connecting the tension end (22) of the cable to the support platform (102); S4: After the new roadbed (200) is filled, the cable is tensioned to keep the cable in a tensioned state, thereby forming a tensioning structure that resists lateral extrusion force; S5: When the cable is loosened or the support platform (102) is slightly displaced laterally, the tensioning force can be adjusted at the tensioning end (22) of the cable to re-tension the cable and restore the overall lateral resistance.

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