Bridge pile foundation for easy-to-liquefy site

Abstract

The bridge pile foundation comprises a wall body, a top plate and a pile body, the top plate is connected to the top end of the wall body, the pile body penetrates through the top plate and the wall body, a filter cylinder is arranged between the pile body and the wall body, and the upper end of the filter cylinder is connected with a suction device; a positioning plate is connected into the wall body and abuts against the periphery of the pile body. The pile body penetrates through the top plate and the wall body, and the positioning plate is connected in the wall body to abut against the periphery of the pile body, so that the pile body is not suspended in the wall body any more, the pile body and the wall body are mutually supported through the positioning plate, and the overall stability of the pile foundation is improved. And the filter cylinder is arranged between the pile body and the wall body, when water in far-field sandy soil flows into a near field, the water is sucked by the suction device after being filtered by the filter cylinder, and the water is effectively blocked, so that the bridge pile foundation can weaken the water pressure in the sandy soil around the pile body, sandy soil liquefaction is avoided, and the stability of the pile body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge pile foundations, in particular to a bridge pile foundation used in sites prone to liquefaction. Background Art

[0002] A bridge pile foundation is a deep foundation consisting of a pile and a pile cap connected to the top of the pile. If the pile is completely buried in the soil and the bottom of the cap is in contact with the soil, it is called a low-cap pile foundation. If the upper part of the pile is exposed above ground and the bottom of the cap is above ground, it is called a high-cap pile foundation. Building pile foundations are typically low-cap pile foundations.

[0003] Sand is widely distributed in my country. Under the influence of natural disasters such as earthquakes, sand in some areas may liquefy. When sand liquefies, the water pressure between the pores in the sand will increase, causing the sand to undergo structural changes, weakening or even losing the friction on the side of the bridge pile foundation, which will eventually affect the stability of the pile body and even destroy it.

[0004] In the existing technology, the conventional method currently used is to use a heavy hammer to press and compact the sand around the pile body. Although this method can alleviate the instability problem caused by the liquefaction of the sand around the pile body in a short time, the sand in the far field will also carry water and continuously flow into the near field, causing the compacted near-field sand to liquefy again in a relatively short time.

[0005] Existing patents also include technologies that prevent near-field sand liquefaction by installing a wall outside the pile body and a suction device between the pile body and the wall, such as Chinese patent CN114561972A published on May 31, 2022. However, in this type of patent, the pile body is suspended within the wall, resulting in poor stability of the entire pile foundation.

[0006] In view of the above phenomenon, it is necessary to provide a bridge pile foundation, so that the bridge pile foundation can reduce the water pressure in the sand around the pile body, avoid sand liquefaction, and increase the stability of the pile body. Utility Model Content

[0007] The purpose of the utility model is to provide a bridge pile foundation for a site prone to liquefaction, which can absorb the moisture in the sand in the far field during the process of flowing into the near field, effectively block the moisture and ensure the stability of the pile body;

[0008] The utility model provides a bridge pile foundation for a site prone to liquefaction, comprising a wall, a top plate and a pile body, wherein the top plate is connected to the top end of the wall body, the pile body passes through the top plate and the wall body, a filter cartridge is provided between the pile body and the wall, the upper end of the filter cartridge is connected to a suction device; a positioning plate is connected to the wall body, and the positioning plate abuts against the outer periphery of the pile body.

[0009] Furthermore, the wall body includes a plurality of wall panels connected end to end along the circumferential direction, and connecting pieces are provided at both ends of the wall panels, and adjacent wall panels are connected by the connecting pieces.

[0010] Furthermore, the positioning plate includes a plurality of arc plates, each of which is independently connected to the inner side of a different wall panel via a bracket, and the plurality of arc plates surround and abut against the outer circumference of the pile body.

[0011] Furthermore, a plurality of inner cylinders are provided in the wall surrounding the pile body, a plurality of water-permeable holes are opened on the inner cylinders, and the filter cylinders are nested in the inner cylinders.

[0012] Furthermore, the filter cartridge includes an outer filter cartridge and an inner filter cartridge, the outer filter cartridge and the inner filter cartridge are respectively provided with a plurality of filter holes, the inner filter cartridge is located inside the outer filter cartridge, and a water absorption layer is filled between the inner filter cartridge and the outer filter cartridge.

[0013] Furthermore, the suction device includes a water suction pipe and a water pump. The water suction pipe is inserted into the lower end of the inner filter cartridge, and the top end of the water suction pipe extends out of the top plate and is connected to the water pump.

[0014] Furthermore, a first flange is provided at the upper end of the inner tube, a plurality of insertion holes are provided on the top plate around the pile body, the inner tube is inserted into the wall through the insertion holes, and the first flange is connected to the top plate through studs.

[0015] Furthermore, a plurality of notches are provided around the lower edge of the first flange.

[0016] Furthermore, the top plate is provided with convex parts around it, and the bottoms of the top plate and the convex parts are both provided with grooves. The top plate is covered on the upper end of the wall through the grooves, and the convex parts are clamped on the outside of the upper end of the connecting piece through the grooves.

[0017] Furthermore, a hole is provided in the middle of the top plate, and the pile body is movable through the hole.

[0018] The technical solution of this utility model is to pass the pile body through the top plate and the wall, and connect the positioning plate in the wall to the outer periphery of the pile body, so that the pile body is no longer suspended in the wall. The pile body and the wall body support each other through the positioning plate, thereby improving the overall stability of the pile foundation. In addition, a filter cartridge is provided between the pile body and the wall. When the water in the far-field sand flows into the near-field, it is filtered by the filter cartridge and then sucked out by the suction device, effectively blocking the water. This allows the bridge pile foundation to reduce the water pressure in the sand around the pile body, prevent the sand from liquefying, and increase the stability of the pile body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is the overall structural diagram of the first perspective of the utility model;

[0021] Figure 2 This is the overall structural diagram of the second viewing angle of the present utility model;

[0022] Figure 3 It is a bottom view of the utility model;

[0023] Figure 4 For this utility model Figure 3 AA cross-sectional structure diagram;

[0024] Figure 5 For this utility model Figure 4 A magnified view of point A;

[0025] Figure 6 This is a schematic diagram of the internal structure of the utility model;

[0026] Figure 7 This is a schematic diagram of the wall panel structure of the present utility model;

[0027] Figure 8 This is a schematic diagram of the top plate structure with piles inserted in the present invention;

[0028] Figure 9 For this utility model Figure 8 Another perspective structure diagram;

[0029] Figure 10 This is a schematic diagram of the inner cylinder structure of the utility model;

[0030] Figure 11 This is a schematic diagram of the filter cartridge structure of the present utility model;

[0031] Description of reference numerals:

[0032] 1-Wall; 101-Wall panel; 2-Connecting piece; 3-First bolt; 4-Top plate; 5-Protrusion; 6-Second bolt; 7-First flange; 8-Pile; 9-Suction pipe; 10-Nut; 11-Inner tube; 12-First cone; 13-Water hole; 14-Bracket; 15-Positioning plate; 1501-Arc plate; 16-Inner filter cartridge; 17-Second cone; 18-Connecting block; 19-Jack; 20-Stud; 21-Notch; 22-Outer filter cartridge; 23-Second flange; 24-Water absorption layer. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0036] Example 1

[0037] like Figures 1-11As shown, the utility model provides a bridge pile foundation for a site prone to liquefaction, comprising a wall 1, a top plate 4 and a pile 8, wherein the top plate 4 is connected to the top of the wall 1, the pile 8 passes through the top plate 4 and the wall 1, a filter cartridge is provided between the pile 8 and the wall 1, and a suction device is connected to the upper end of the filter cartridge; a positioning plate 15 is connected inside the wall 1, and the positioning plate 15 abuts against the outer periphery of the pile 8.

[0038] Specifically, the interior of the wall 1 is hollow, and the top is connected to the top plate 4, through which structures such as the filter cartridge and the suction pipe 9 can be fixedly installed in the wall 1. The pile 8 passes through the top plate 4 and is inserted into the wall 1, and is located in the center of the wall 1. In the process of driving the pile 8 and the wall 1 into the foundation, since the positioning plate 15 is connected to the wall 1 and the positioning plate 15 is in contact with the pile 8, the pile 8 is no longer driven in the wall 1 in a suspended state, so the pile 8 and the wall 1 maintain the consistency of the overall structure, and the pile 8 will not be eccentric compared to the wall 1. The pile 8 and the wall 1 support each other through the positioning plate 15, thereby improving the overall stability of the pile foundation.

[0039] In this device, the suction device is connected to the filter cartridge between the wall 1 and the pile 8. When the moisture in the far-field sand flows into the near-field, it needs to be filtered through the filter cartridge before being sucked by the suction device, which effectively blocks the moisture to prevent the sand from liquefying and prevents the loss of sand.

[0040] Example 2

[0041] The wall 1 comprises a plurality of wall panels 101 connected end to end along the circumference. Connecting pieces 2 are provided at both ends of each wall panel 101, connecting adjacent wall panels 101 via the connecting pieces 2. The positioning plate 15 comprises a plurality of curved plates 1501, each independently connected to the inner side of a different wall panel 101 via a bracket 14. The plurality of curved plates 1501 surround and abut the outer circumference of the pile body 8.

[0042] Specifically, the wall 1 includes four right-angled wall panels 101 connected end to end along the circumferential direction. A connecting piece 2 is vertically fixed to the outer sides of the two ends of each right-angled wall panel 101. Adjacent connecting pieces 2 are abutted and fixedly connected by a plurality of first bolts 3 arranged from top to bottom. Multiple brackets 14 are fixed to the inner side of each right-angled wall panel 101, and an arc plate 1501 is fixed to the inner end of each bracket 14. The four arc plates 1501 at the same height enclose a full-circular annular positioning plate 15 that can allow the pile body 8 to pass through. The four arc plates 1501 jointly abut the outer side of the pile body 8, securing the pile body 8 in a mutually clamping manner.

[0043] Example 3

[0044] Multiple inner cylinders 11 are provided around the pile body 8 within the wall 1. The inner cylinders 11 are provided with multiple water-permeable holes 13, and the filter cartridge is nested within the inner cylinder 11. The filter cartridge includes an outer filter cartridge 22 and an inner filter cartridge 16. Each of the outer filter cartridge 22 and the inner filter cartridge 16 is provided with multiple filter holes. The inner filter cartridge 16 is located within the outer filter cartridge 22, and a water-absorbing layer 24 is filled between the inner filter cartridge 16 and the outer filter cartridge 22. The suction device includes a suction pipe 9 and a water pump (not shown). The suction pipe 9 is inserted into the lower end of the inner filter cartridge 16. The top end of the suction pipe 9 extends out of the top plate 4 and is connected to the water pump. A first flange 7 is provided at the upper end of the inner cylinder 11. Multiple insertion holes 19 are provided on the top plate 4 around the pile body 8. The inner cylinder 11 is inserted into the wall 1 through the insertion holes 19. The first flange 7 is connected to the top plate 4 via studs 20. Multiple notches 21 are provided around the lower edge of the first flange 7.

[0045] Specifically, a plurality of insertion holes 19 are provided on the top plate 4 around the pile body 8, and an inner cylinder 11 is inserted downwardly into each insertion hole 19. In order to facilitate the insertion of the inner cylinder 11 into the sand, a first cone 12 is provided at the bottom of the inner cylinder 11. The side of the inner cylinder 11 is provided with a plurality of rectangular water-permeable holes 13 in a layered array. A pressure sensor (not shown) can be embedded in the side wall of the rectangular water-permeable hole 13 to monitor the water pressure at the position of the inner cylinder 11. A filter cartridge is nested inside the inner cylinder 11. The filter cartridge includes an outer filter cartridge 22 and an inner filter cartridge 16. A water-absorbing layer 24 is filled between the outer filter cartridge 22 and the inner filter cartridge 16. A water-absorbing pipe 9 is inserted into the lower end position of the inner filter cartridge 16. The center of the inner filter cartridge 16 is configured to be able to insert the water-absorbing pipe 9. The water-absorbing layer 24, such as a polymer water-absorbing resin, is used to absorb water from the far field. After absorbing a certain amount, the water is pumped out through the water-absorbing pipe 9 to prevent the far-field water from flowing into the near field and causing the sand to liquefy. The water suction pipe 9 is connected to an external water pump, and when the water pressure in the inner cylinder 11 reaches a preset value, the water pump is turned on to pump water.

[0046] Multiple studs 20 are positioned around each insertion hole 19 on the top plate 4. A first flange 7, which can be mounted on the studs 20, is located at the upper end of the inner tube 11. A second flange 23, which can be mounted on the upper end of the outer filter cartridge 22, is located. Once the first and second flanges 7 and 23 are in place, they are secured with nuts 10. To facilitate removal of the inner tube 11, multiple notches 21 are provided at the lower edge of the first flange 7, allowing a mechanical gripper to grasp the first flange 7 and remove the inner tube 11 for replacement.

[0047] Example 4

[0048] The top plate 4 is provided with convex portions 5 around its periphery, and grooves are provided at the bottoms of both the top plate 4 and the convex portions 5. The top plate 4 is covered on the upper end of the wall 1 through the grooves, and the convex portions 5 are engaged with the upper end of the connecting piece 2 through the grooves. A hole is provided in the middle of the top plate 4, and the pile body 8 is movably inserted into the hole.

[0049] Specifically, the bottom of the top plate 4 is a groove, and the top plate 4 is provided with a convex portion 5 around it. The bottom surface of the convex portion 5 also has a groove. The top plate 4 can just cover the upper end of the wall 1 formed by the four right-angle wall panels 101, and the groove on the bottom surface of the convex portion 5 can be snapped into the upper end of the connecting piece 2. Figure 7 A connecting block 18 is provided at the angle between the connecting piece 2 and the right-angle wall panel 101. The connecting block 18 is connected to the top plate 4 via at least two second bolts 6 for securement. The pile 8 flexibly penetrates the hole in the center of the top plate 4. A second tapered portion 17 is provided at its bottom end to facilitate driving down into the sand and soil. It also facilitates entry into the full-circle positioning plate 15 to define its position and prevent it from shifting or tilting.

[0050] The utility model provides a bridge pile foundation construction method for liquefaction-prone sites:

[0051] First, connect the four right-angle wall panels 101, then install the top plate 4 in place, position the assembled wall 1, and then drive it down to a certain depth, keeping the bracket 14 and positioning plate 15 at the bottom above the sand. Then insert the pile body 8, so that the pile body 8 is inserted into the top plate 4 and the full-circle positioning plate 15 in turn, and then drive the pile body 8 into a certain depth. Then, drive the wall 1 and the pile body 8 down into the sand in turn, and the driving depth keeps the lower end of the pile body 8 always below the full-circle at the bottom, ensuring that the full-circle positioning plate 15 and the bracket 14 are protected by the pile body 8 during the driving process and are not easily deformed. After the wall 1 and the pile body 8 are all driven into place, insert multiple inner tubes 11 into the corresponding jacks 19, and insert the filter cartridge and the water absorption layer 24 into the inner tube 11, and drive them down into the sand together. Finally, insert one end of the suction pipe 9 into the filter cartridge and connect the other end to the water pump. When the water pressure in the inner tube 11 reaches a preset value, the water pump is turned on to pump water to avoid liquefaction of sand in the near field.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bridge pile foundation for a liquefiable site, characterized in that: It includes a wall, a top plate and a pile body, wherein the top plate is connected to the top of the wall body, the pile body passes through the top plate and the wall body, a filter cartridge is provided between the pile body and the wall, and the upper end of the filter cartridge is connected to a suction device; A positioning plate is connected to the wall, and the positioning plate abuts against the outer periphery of the pile body.

2. The bridge pile foundation for liquefiable sites according to claim 1, characterized in that: The wall body comprises a plurality of wall panels connected end to end along a circumferential direction. Both ends of the wall panels are provided with connecting pieces, and adjacent wall panels are connected by the connecting pieces.

3. The bridge pile foundation for liquefiable sites according to claim 2, characterized in that: The positioning plate includes a plurality of arc plates, each of which is independently connected to the inner side of a different wall plate through a bracket, and the plurality of arc plates surround and abut against the outer periphery of the pile body.

4. The bridge pile foundation for liquefiable sites according to claim 1, characterized in that: A plurality of inner cylinders are arranged in the wall surrounding the pile body, a plurality of water-permeable holes are opened on the inner cylinders, and the filter cylinders are nested in the inner cylinders.

5. The bridge pile foundation for liquefiable sites according to claim 4, characterized in that: The filter cartridge includes an outer filter cartridge and an inner filter cartridge. The outer filter cartridge and the inner filter cartridge are respectively provided with a plurality of filter holes. The inner filter cartridge is located inside the outer filter cartridge. A water absorption layer is filled between the inner filter cartridge and the outer filter cartridge.

6. The bridge pile foundation for liquefiable sites according to claim 5, characterized in that: The suction device includes a water suction pipe and a water pump. The water suction pipe is inserted into the lower end of the inner filter cartridge, and the top end of the water suction pipe extends out of the top plate and is connected to the water pump.

7. The bridge pile foundation for liquefiable sites according to claim 5, characterized in that: A first flange is provided at the upper end of the inner tube, a plurality of insertion holes are provided on the top plate surrounding the pile body, the inner tube is inserted into the wall through the insertion holes, and the first flange is connected to the top plate through studs.

8. The bridge pile foundation for liquefiable sites according to claim 7, characterized in that: A plurality of notches are formed around the lower edge of the first flange.

9. The bridge pile foundation for liquefiable sites according to claim 2, characterized in that: The top plate is provided with convex parts around it, and the bottoms of the top plate and the convex parts are both provided with grooves. The top plate is covered on the upper end of the wall through the groove, and the convex part is clamped on the outer side of the upper end of the connecting piece through the groove.

10. The bridge pile foundation for liquefiable sites according to claim 9, characterized in that: A hole is provided in the middle of the top plate, and the pile body is movably inserted into the hole.

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