CN218952230U

CN218952230U - Anti-seismic bridge pier foundation

Info

Publication number: CN218952230U
Application number: CN202223034410.7U
Authority: CN
Inventors: 王建飞; 王丽锋; 王大鹏; 许坤; 韩强
Original assignee: Zhongjiao Xiong'an Construction Co ltd; Beijing University of Technology; CCCC Construction Group Co Ltd
Current assignee: Zhongjiao Xiong'an Construction Co ltd; Beijing University of Technology; CCCC Construction Group Co Ltd
Priority date: 2022-11-14
Filing date: 2022-11-14
Publication date: 2023-05-02
Anticipated expiration: 2032-11-14

Abstract

The utility model discloses an anti-seismic pier foundation, which belongs to the technical field of anti-seismic toughness improvement of bridge engineering, and comprises a pier, wherein the lower end of the pier is fixedly connected with the foundation, the lower part of the foundation is abutted against a pebble layer, two sides of the pebble layer are provided with a backfill layer, the foundation is provided with an inclined square hole, and an anchoring device is arranged in the inclined square hole and comprises: the rotary cylinder penetrates through the inclined square hole from top to bottom, the extension rod is located in the rotary cylinder and is in sliding connection with the rotary cylinder, the grooves are located on two sides of the extension rod, one end of the anchoring piece is located in the grooves and is hinged to the grooves, a spring is connected between the anchoring piece and the grooves, the stop is fixedly connected with the grooves, and the stop is located below the free ends of the anchoring piece. The function restorability after earthquake of the existing pier structure is improved through the nonlinear interaction between the foundation and the backfill layer, the foundation separation amplitude is prevented from being overlarge through the anchoring structure, and the function and restorability after earthquake of the pier structure are ensured.

Description

Anti-seismic bridge pier foundation

Technical Field

The utility model belongs to the technical field of seismic toughness improvement of bridge engineering, and particularly relates to a seismic pier foundation.

Background

The current common anti-seismic reinforcement technology comprises a cross section increasing method, an external prestress method, an external steel wrapping method, a carbon fiber cloth reinforcement method and an anti-seismic technology. The structure after the earthquake-resistant reinforcement technology still generates larger residual displacement, and the function restorability of the bridge structure after earthquake is difficult to be improved. The current common recoverable functional structures are mainly divided into three main manifestations: the swing structure, the self-resetting structure and the replaceable component structure can be combined to achieve the aim of quick restoration after earthquake. These measures are proposed from the structural level entirely, and the purpose of improving the post-earthquake functional recoverability of the existing pier structure is not considered by changing the constraint between the structural members and the foundation. If the pebble layer under the existing foundation is partially replaced by a backfill layer, the structural foundation is intentionally weakened, the structural foundation is allowed to be separated from foundation soil during an earthquake, and the nonlinearity of the contact surface of the foundation and the nonlinearity, plastic deformation and the like of the foundation soil consume earthquake energy, so that the plastic hinge originally formed on the upper structure is transferred to the foundation soil, the plastic deformation of the upper structure is reduced or avoided, and collapse of the upper structure is prevented, thereby ensuring the safety of the upper structure. However, the amplitude of the left and right shaking of the foundation is not limited after the earthquake, and the situation that the foundation cannot be reset due to the overlarge shaking amplitude is likely to occur, so that the foundation is limited by the earthquake-resistant pier foundation.

Disclosure of Invention

Therefore, the utility model aims to provide an earthquake-resistant pier foundation, which improves the function restorability of the existing pier structure after earthquake through nonlinear interaction between the foundation and a filler layer, and prevents the overlarge separation amplitude of the foundation through an anchoring structure, ensures the post-earthquake function and restorability of the pier structure and ensures the smoothness of traffic life lines after earthquake.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model relates to an earthquake-resistant pier foundation, which comprises a pier, wherein the lower end of the pier is fixedly connected with a foundation, the lower part of the foundation is abutted against a pebble layer, two sides of the pebble layer are provided with a backfill layer, the foundation is provided with an inclined square hole, an anchoring device is arranged in the inclined square hole, and the anchoring device comprises: the novel anti-theft device comprises a rotating cylinder, an extension rod, an anchoring piece, a groove and a stop block, wherein the rotating cylinder penetrates through an inclined square hole from top to bottom, the extension rod is located in the rotating cylinder and is in sliding connection with the rotating cylinder, the groove is located on two sides of the extension rod, one end of the anchoring piece is located in the groove and is hinged to the groove, a spring is connected between the anchoring piece and the groove, the stop block is fixedly connected with the groove, and the stop block is located below the free end of the anchoring piece.

Further, a plurality of square holes are formed in the foundation, and a plurality of anchoring devices are arranged in each square hole.

Further, the extension rod is internally and slidably connected with a fixing rod, and one end, far away from the foundation, of the fixing rod is in threaded connection with the extension rod.

Further, a through hole is formed in the bridge pier from top to bottom, the through hole penetrates through the foundation, a force rib is connected in the through hole, and the force rib is fixedly connected with the foundation.

Further, a fixed bracket is connected between the bridge pier and the foundation.

Further, a protective rib is connected between the bridge pier and the foundation.

Further, the lower end of the rotating cylinder is connected with teeth, a baffle plate is hinged in the rotating cylinder, and a butt block is arranged at the hinging point.

The utility model has the beneficial effects that:

according to the earthquake-resistant pier foundation, the pebble layer is partially replaced by the filler replacement layer, the connection between the foundation and the structure is weakened, the foundation is separated from the filler replacement layer under the action of an earthquake, and the foundation is limited in separation angle by the anchoring device, so that the foundation cannot return due to excessive separation; the earthquake energy is consumed by utilizing the nonlinear deformation of the foundation and the backfill layer, and the structure period is prolonged, so that the damage of the pier structure is reduced; the lifting and swinging function of the foundation is utilized, the self-resetting capability of the pier structure is improved, the residual displacement of the pier is reduced, and the post-earthquake functionality and the restorability of the pier structure after transformation are improved.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objects and other advantages of the utility model may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.

Drawings

In order to make the objects, technical solutions and advantageous effects of the present utility model more clear, the present utility model provides the following drawings for description:

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a cross-sectional view of an anchoring device according to the present utility model;

FIG. 3 is an enlarged view of the anchoring device of the present utility model;

fig. 4 is a bottom view of the rotating drum of the present utility model.

The figures are marked as follows: 1. bridge piers; 2. a foundation; 3. protective ribs; 4. a fixed bracket; 5. a force bar; 6. an inclined square hole; 7. changing a filling layer; 8. a pebble layer; 9. teeth; 10. a baffle; 11. a rotating cylinder; 12. an anchor sheet; 13. a groove; 14. a spring; 15. a fixed rod; 16. a stop block; 17. an extension rod; 18. a through hole; 19. and (5) abutting the block.

Detailed Description

As shown in fig. 1 to 4, the earthquake-resistant pier foundation comprises a pier 1, wherein the lower end of the pier 1 is fixedly connected with a foundation 2, a fixed support 4 is connected between two sides of the pier 1 and the foundation 2, and a plurality of protection ribs 3 are connected between two sides of the pier 1 and the foundation 2, and the protection ribs 3 are inclined. The bridge pier 1 is internally provided with a through hole 18 from top to bottom, the through hole 18 penetrates through the foundation 2, a force rib 5 is connected in the through hole 18, and the force rib 5 is fixedly connected with the foundation 2. The pebble layer 8 is contradicted to 2 lower parts of basis, pebble layer 8 both sides have trades the filler layer 7, a plurality of square holes 6 have been seted up to the basis 2, all install a plurality of anchor in every square hole 6, anchor includes: the rotary barrel 11, the extension rod 17, the anchor sheet 12, the groove 13 and the stop block 16, the rotary barrel 11 penetrates through the inclined square hole 6 from top to bottom, the lower end of the rotary barrel 11 is connected with the tooth 9, the stop sheet 10 is hinged in the rotary barrel 11, and the abutting block 19 is arranged at the hinging point. The extension rod 17 is located in the rotary cylinder 11 and is in sliding connection with the rotary cylinder 11, a fixing rod 15 is connected in a sliding manner with the extension rod 17, one end, away from the foundation 2, of the fixing rod 15 is in threaded connection with the extension rod 17, and the length of the fixing rod 15 is larger than that of the extension rod 17. The groove 13 is located on two sides of the extension rod 17, one end of the anchoring piece 12 is located in the groove 13 and hinged to the groove 13, a spring 14 is connected between the anchoring piece 12 and the groove 13, the stop block 16 is fixedly connected with the groove 13, and the stop block 16 is located below the free end of the anchoring piece 12.

The working mode of the device is as follows: the pebble layer 8 on the two sides of the lower end of the foundation 2 is dug out and replaced by the filler layer 7, the rotating cylinder 11 is driven to rotate, the rotating cylinder 11 is screwed into the filler layer, the baffle plate 10 is propped against the rotating cylinder 11 through the propping block 19, the baffle plate 10 cannot be turned inwards, so that soil cannot enter the rotating cylinder 11, at the moment, the baffle plate 10 is rotated outwards of the rotating cylinder 11 when the extension rod 17 is pressed into the rotating cylinder 11, the rotating cylinder 11 is communicated, and at the moment, the extension rod 17 extends out of the rotating cylinder 11 and enters the filler layer. When one end of the extension rod 17 without threads is completely immersed into the rotary cylinder 11, the extension rod 17 is pulled back to enable the anchoring piece 12 to be unfolded and anchored with the filling layer, the spring 14 can limit the rotation angle of the anchoring piece 12, the overlarge rotation angle is prevented, the anchoring effect is prevented from being lost, at the moment, the fixing rod 15 is pressed into the extension rod 17, the fixing rod 15 is rotated again to enable one end of the fixing rod 15 to be in threaded connection with the extension rod 17, the fixing rod 15 is prevented from extending out of the filling layer, and at the moment, the bottom end of the fixing rod 15 is propped against the bottom of the filling layer 7 to form supporting force.

The beneficial effect of above-mentioned scheme: the pebble layer 8 is partially replaced by the filler replacing layer 7, so that the connection between the foundation 2 and the structure is weakened, and the foundation 2 is separated from the filler replacing layer 7 under the action of an earthquake; the foundation 2 is limited in separation angle by the anchoring device, so that the foundation 2 cannot return due to overlarge separation angle of the foundation 2 is prevented; the supporting force formed by the fixing rod 15 on the foundation 2 prevents the foundation 2 from tilting left and right; the traction force and the supporting force can be formed between the bridge pier 1 and the foundation 2 through the force bars 5, the fixed brackets 4 and the protective bars 3, so that the connection between the bridge pier 1 and the foundation 2 is more stable, the nonlinear deformation of the foundation 2 and the backfill layer 7 is utilized to consume seismic energy, the structure period is prolonged, and the damage of the bridge pier 1 structure is reduced; by utilizing the lift-off swinging effect of the foundation 2, the self-resetting capability of the pier 1 structure is improved, the residual displacement of the pier 1 is reduced, and the post-earthquake functionality and the restorability of the pier 1 structure after transformation are improved.

Finally, it is noted that the above-mentioned preferred embodiments are only intended to illustrate rather than limit the utility model, and that, although the utility model has been described in detail by means of the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the utility model as defined by the appended claims.

Claims

1. An antidetonation pier basis, its characterized in that: including pier (1), pier (1) lower extreme fixedly connected with basis (2), foundation (2) lower part is contradicted and is had pebble layer (8), pebble layer (8) both sides have to trade and fill soil layer (7), inclined square hole (6) have been seted up to basis (2), install anchor in inclined square hole (6), anchor includes: rotating cylinder (11), extension rod (17), anchor piece (12), recess (13) and dog (16), rotating cylinder (11) top-down wears to establish inclined square hole (6), extension rod (17) are located rotating cylinder (11) and with rotating cylinder (11) sliding connection, recess (13) are located extension rod (17) both sides, anchor piece (12) one end is located recess (13) and articulated with recess (13), be connected with spring (14) between anchor piece (12) and recess (13), dog (16) and recess (13) fixed connection, dog (16) are located the below of anchor piece (12) free end.

2. An earthquake-resistant pier foundation according to claim 1, wherein: the foundation (2) is provided with a plurality of inclined square holes (6), and a plurality of anchoring devices are arranged in each inclined square hole (6).

3. An earthquake-resistant pier foundation according to claim 1, wherein: the extension rod (17) is connected with the fixed rod (15) in a sliding mode, and one end, far away from the foundation (2), of the fixed rod (15) is connected with the extension rod (17) in a threaded mode.

4. An earthquake-resistant pier foundation according to claim 1, wherein: through holes (18) are formed in the bridge pier (1) from top to bottom, the through holes (18) penetrate through the foundation (2), the through holes (18) are connected with the reinforcing bars (5), and the reinforcing bars (5) are fixedly connected with the foundation (2).

5. An earthquake-resistant pier foundation according to claim 1, wherein: a fixed bracket (4) is connected between the bridge pier (1) and the foundation (2).

6. An earthquake-resistant pier foundation according to claim 1, wherein: and a protective rib (3) is connected between the bridge pier (1) and the foundation (2).

7. An earthquake-resistant pier foundation according to claim 1, wherein: the lower end of the rotating cylinder (11) is connected with teeth (9), a baffle (10) is hinged in the rotating cylinder (11), and a butt block (19) is arranged at a hinge point.