Bridge anti-push inclined pile foundation

Abstract

The utility model relates to an anti-push inclined pile foundation for a bridge. The anti-push inclined pile foundation comprises a bearing platform, the multiple anti-pushing piles are arranged below the bearing platform, the tops of the anti-pushing piles are connected with the bearing platform, the multiple anti-pushing piles are sequentially arranged at intervals in the longitudinal bridge direction, and the anti-pushing piles are obliquely arranged in the direction opposite to the horizontal thrust direction of the bridge. The anti-pushing pile is arranged in the mode that the anti-pushing pile inclines in the direction opposite to the horizontal thrust direction of the bridge, so that the anti-pushing pile can effectively resist the horizontal thrust generated by the bridge structure, and the vertical force and the horizontal thrust generated by the bridge structure are transmitted to the anti-pushing pile through the bearing platform; vertical force and horizontal thrust generated by a bridge are finally borne through friction force between the anti-push piles and a soil layer and bearing force of a pile end foundation, deformation of a bridge abutment structure on the upper portion of a bearing platform can be reduced, secondary internal force caused by bridge abutment deformation of the bridge structure is reduced, bridge safety is improved, excavation of a foundation pit can be avoided, and the influence on buildings around the proposed bridge is extremely small; a large-area anti-sliding plate is not needed, and the comprehensive cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a bridge anti-thrust oblique pile foundation. Background Art

[0002] Arch bridges, slanted-leg rigid frame bridges and other bridge types are often seen in urban bridges due to their beautiful shapes. Due to the special structural system of arch bridges and slanted-leg rigid frame bridges, they generate large horizontal thrust. In order to resist the horizontal thrust generated by them, a large-area anti-slip plate is generally set behind the abutment to resist the horizontal thrust generated by the bridge structure through the friction between the anti-slip plate and the foundation.

[0003] However, due to the large horizontal thrust generated by the bridge structure, a larger area of ​​anti-slip plates is generally required, especially in soft soil sections, where the volume of the anti-slip plates increases exponentially. In addition, there are many buildings around urban bridges, and the foundation pit excavated for the installation of anti-slip plates is very likely to cause deformation of buildings around the proposed bridge, resulting in uncontrollable risks.

[0004] Therefore, it is an urgent engineering and technical problem to effectively transfer the horizontal thrust generated by structures such as arch bridges and inclined-leg rigid-frame bridges to the foundation without causing significant deformation of the abutments while ensuring the safety of surrounding buildings. Utility Model Content

[0005] Based on the above description, the utility model provides a bridge thrust-resistant inclined pile foundation to effectively transfer the horizontal thrust generated by structures such as arch bridges and inclined-leg rigid frame bridges to the foundation without causing significant deformation of the abutments, while ensuring the safety of surrounding buildings.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] The present application provides a bridge anti-thrust oblique pile foundation, and the technical solution adopted is as follows:

[0008] A bridge thrust-resistant oblique pile foundation, comprising:

[0009] platform;

[0010] A plurality of anti-thrust piles are arranged below the pedestal and connected to the pedestal at the top. The plurality of anti-thrust piles are arranged in sequence and spaced apart along the longitudinal direction of the bridge. The anti-thrust piles are inclined in a direction opposite to the horizontal thrust direction of the longitudinal direction of the bridge.

[0011] Preferably, along the horizontal thrust direction of the bridge, the inclination angle of the anti-thrust piles gradually increases.

[0012] Preferably, the anti-thrust pile comprises a steel pipe and a steel cage arranged in the steel pipe, concrete is poured in the steel pipe, and the steel pipe and the top of the steel cage are embedded in the foundation.

[0013] Preferably, it also includes at least one supporting pile, which is arranged below the base and has a top connected to the base, and the supporting pile is vertically arranged.

[0014] Preferably, the supporting piles and the anti-thrust piles are distributed in sequence along the horizontal thrust direction of the bridge.

[0015] Preferably, the supporting piles are reinforced concrete piles.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0017] 1. The present application sets a plurality of anti-thrust piles, which are connected to the pedestal to form a whole. The anti-thrust piles are inclined in the direction opposite to the horizontal thrust of the bridge, so that they can effectively resist the horizontal thrust generated by the bridge structure. The vertical force and horizontal thrust generated by the bridge structure are specially delivered to the anti-thrust piles through the pedestal. The vertical force and horizontal thrust generated by the bridge structure are finally borne by the friction between the anti-thrust piles and the soil layer and the bearing capacity of the foundation at the pile end. The deformation of the abutment structure on the upper part of the pedestal can be reduced, and the secondary internal force of the bridge structure caused by the deformation of the abutment can be reduced, thereby improving the safety of the bridge. In addition, the pile foundation construction can avoid the excavation of the foundation pit, and has little impact on the surrounding buildings of the proposed bridge. It is environmentally friendly and does not require the installation of a large-area anti-slip plate. The comprehensive cost is lower than that of the anti-slip plate, especially in soft soil foundation areas, and has a very large economic advantage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the bridge anti-thrust oblique pile foundation provided by the embodiment of the utility model;

[0019] Figure 2 A schematic structural diagram of the anti-thrust piles in the anti-thrust inclined pile foundation of a bridge provided in an embodiment of the utility model.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0021] 1. Capping platform; 2. Anti-thrust pile; 21. Steel pipe; 22. Steel cage; 3. Support pile. DETAILED DESCRIPTION

[0022] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0024] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0025] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0026] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0027] Reference Figure 1-2 As shown, an embodiment of the present application provides an anti-thrust inclined pile foundation for a bridge, which includes a pedestal 1, supporting piles 3 and anti-thrust piles 2, wherein the supporting piles 3 and the anti-thrust piles 2 are both arranged below the pedestal 1 and driven into the foundation, and the tops of the supporting piles 3 and the anti-thrust piles 2 are connected to the pedestal 1, wherein the supporting piles 3 are vertically arranged, and the anti-thrust piles 2 are inclined in a direction opposite to the horizontal thrust direction of the bridge.

[0028] Specifically, the support piles 3 and the anti-thrust piles 2 are distributed in sequence along the horizontal thrust direction of the bridge. At least one support pile 3 is provided, and the specific number is designed according to the actual bridge. When multiple support piles 3 are provided, the multiple support piles 3 are arranged in sequence at intervals along the longitudinal direction of the bridge.

[0029] Reference Figure 1 As shown, further, a plurality of anti-thrust piles 2 are arranged, and the plurality of anti-thrust piles 2 are arranged in sequence along the longitudinal direction of the bridge, and along the horizontal thrust direction of the bridge, the inclination angle of the anti-thrust piles 2 gradually increases. The arrangement of a plurality of anti-thrust piles 2 and the arrangement of the changing inclination angle of the anti-thrust piles 2 can improve the ability of the pile foundation to resist the horizontal thrust of the bridge.

[0030] Reference Figure 1-2 As shown, specifically, the anti-thrust pile 2 includes a steel pipe 21 and a steel cage 22 disposed therein, and concrete is poured in the steel pipe 21. The tops of the steel pipe 21 and the steel cage 22 are embedded in the cap 1. During construction, the steel pipe 21 is temporarily fixed and driven into the foundation according to the angle of the anti-thrust pile 2, and the steel cage 22 is placed in the steel pipe 21 and concrete is poured. After the concrete reaches the strength, the anti-thrust pile 2 is formed. The support pile 3 is a reinforced concrete pile, which can be formed by directly drilling a hole in the foundation, placing the steel cage 22 and pouring concrete. It can also be formed by a combination of a steel pipe 21 and a steel cage 22 like the anti-thrust pile 2, first driving the steel pipe 21 and then placing the steel cage 22 and pouring concrete.

[0031] Furthermore, when the pile foundations of the present application are respectively set at both ends of the bridge, the anti-thrust piles 2 of the pile foundations at both ends are inclined in opposite directions, and according to the width of the bridge, multiple groups of supporting piles 3 and anti-thrust piles 2 in the pile foundations can be arranged at intervals along the transverse direction of the bridge to improve the supporting capacity of the bridge.

[0032] Furthermore, during construction, the construction of the supporting piles 3 and the anti-thrust piles 2 is completed first, and steel bars are reserved at the top of the supporting piles 3 and the top of the anti-thrust piles 2 for connection with the steel bars of the pedestal 1. During the construction of the pedestal 1, the tops of the supporting piles 3 and the anti-thrust piles 2 and the reserved connecting steel bars are cast inside to improve the connection strength between the pedestal 1 and the supporting columns and the anti-thrust piles 2, and the supporting piles 3 and multiple anti-thrust piles 2 are connected to form a whole through the pedestal 1.

[0033] The construction method of this embodiment is as follows:

[0034] 1. According to the vertical and horizontal forces transmitted by the superstructure, the number and diameter of the support piles 3 and the anti-thrust piles 2 are calculated and determined, and the inclination angle of each anti-thrust pile 2 is determined, as well as other design parameters. The size of the steel cage 22 of the anti-thrust pile 2 is reasonably determined according to the diameter of the steel pipe 21.

[0035] 2. The steel pipe 21 and the steel cage 22 are processed and manufactured in the factory. After the steel pipe 21 and the steel cage 22 are processed and welded in the factory, they are transported to the construction site after the factory non-destructive testing and other acceptance are completed.

[0036] 3. Reasonably set up temporary fixing measures, drive the steel pipe 21 of the anti-thrust pile 2 at the designed oblique angle, clean the soil inside the steel pipe 21, put in the steel cage 22, and pour concrete.

[0037] 4. After the concrete of anti-thrust pile 2 and supporting pile 3 reaches the curing age and strength required by the specification, the reinforcement binding and concrete pouring processes of foundation 1 are carried out.

[0038] 5. After the construction of the foundation 1 is completed, the anti-thrust inclined pile foundation and the vertical concrete pile foundation form a whole and enter the working state. At this time, the upper structure construction can be carried out.

[0039] The operating principle of the pile foundation of the present application is: under the action of the upper structure load, the bridge generates vertical force and horizontal thrust, which are transmitted to the inclined pile foundation and the vertical pile foundation through the pedestal 1, and finally bear the vertical force and horizontal thrust generated by the bridge through the friction force of the soil between the piles and the bearing capacity of the foundation at the pile end.

[0040] Specifically, during the operation of the bridge, the pile foundation is a concealed project and cannot be replaced. It is necessary to design its durability to be consistent with the service life of the bridge to ensure the safety of bridge operation.

[0041] The embodiments of the present application have the following advantages:

[0042] 1. It can effectively resist the horizontal thrust generated by arch bridges, inclined-leg rigid frame bridges and other bridge structures, and the deformation of the abutment is extremely small, which greatly reduces the secondary internal force of the bridge structure caused by the deformation of the abutment and improves the safety of the bridge.

[0043] 2. The steel pipe 21 is welded and manufactured in the factory, assembled on site, and driven into the foundation on site, which can effectively control the welding and installation quality.

[0044] 3. After the steel pipe 21 is driven into the foundation and the hole is effectively cleaned, the steel cage 22 is placed and concrete is poured, which effectively avoids the hole collapse problem of conventional reinforced concrete pile foundations.

[0045] 4. It avoids excavation of foundation pits, has little impact on buildings around the proposed bridge, and is environmentally friendly.

[0046] 5. Save construction cost. Compared with the anti-slip plate, it does not require excavation of foundation pits or installation of large-area anti-slip plates. The comprehensive construction cost is lower than that of the anti-slip plate, especially in soft soil foundation areas, which has great economic advantages.

[0047] 6. Shortened the construction period and improved the construction efficiency.

[0048] 7. Expand the application area of ​​bridge structures such as arch bridges and inclined-leg rigid-frame bridges.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bridge anti-thrust oblique pile foundation, characterized in that: include: Platform(1); A plurality of anti-thrust piles (2) are arranged below the pedestal (1) and connected to the pedestal (1) at their tops. The plurality of anti-thrust piles (2) are arranged in sequence and spaced apart along the longitudinal direction of the bridge. The anti-thrust piles (2) are arranged inclined in a direction opposite to the horizontal thrust direction of the bridge.

2. The bridge thrust-resistant oblique pile foundation according to claim 1, characterized in that: Along the horizontal thrust direction of the bridge, the inclination angle of the anti-thrust pile (2) gradually increases.

3. The bridge thrust-resistant oblique pile foundation according to claim 1, characterized in that: The anti-thrust pile (2) comprises a steel pipe (21) and a steel cage (22) arranged in the steel pipe (21); concrete is poured in the steel pipe (21); and the tops of the steel pipe (21) and the steel cage (22) are embedded in the foundation (1).

4. The bridge thrust-resistant oblique pile foundation according to claim 1, characterized in that: It also comprises at least one supporting pile (3), which is arranged below the support platform (1) and the top of which is connected to the support platform (1), and the supporting pile (3) is arranged vertically.

5. The bridge thrust-resistant oblique pile foundation according to claim 4 is characterized in that: The supporting piles (3) and the anti-thrust piles (2) are distributed in sequence along the horizontal thrust direction of the bridge.

6. The bridge thrust-resistant oblique pile foundation according to claim 4, characterized in that: The supporting piles (3) are reinforced concrete piles.

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