CN-116397560-B - Post-earthquake resetting and reinforcing system and method for reinforced concrete bridge pier

CN116397560BCN 116397560 BCN116397560 BCN 116397560BCN-116397560-B

Abstract

The invention discloses a post-earthquake resetting and reinforcing system of a reinforced concrete pier, which comprises a bearing platform, steel sleeve shoes, a bent cap anchor plate, an upper steel anchor cylinder, a lower steel anchor cylinder and a inhaul cable, wherein the bearing platform is arranged on a pier column base below a concrete pier column, the steel sleeve shoes are provided with at least four and are arranged at the edges of the bearing platform, the bent cap anchor plate is arranged on a bridge bent cap positioned at the top end of the concrete pier column, the lower steel anchor cylinder is hinged and arranged on the steel sleeve shoes, the upper steel anchor cylinder is arranged on the bent cap anchor plate, and the inhaul cable is arranged between the upper steel anchor cylinder and the lower steel anchor cylinder and is anchored. The invention also discloses a post-earthquake resetting and reinforcing method for the reinforced concrete bridge pier. The post-earthquake resetting and reinforcing system and the post-earthquake resetting and reinforcing method for the reinforced concrete bridge pier are simple and practical, can improve the self-resetting capability of a large number of middle-small span simply supported girder bridges and continuous girder bridge piers built in China, reduce residual displacement after earthquake, ensure normal operation, improve post-earthquake reinforcing efficiency, reduce reinforcing cost, and are rapid and convenient to install and short in construction period.

Inventors

LIU XIAOXIAN
Guang Xinchao
ZHANG XUEJIAN
WANG JINGFENG
XIANG NAILIANG
WANG WEI

Assignees

合肥工业大学

Dates

Publication Date: 20260505
Application Date: 20230523

Claims (5)

1. The reinforced concrete pier post-earthquake resetting and reinforcing system is characterized by comprising a bearing platform (1), steel sleeve shoes (2), a bent cap anchor plate (3), an upper steel anchor cylinder (4), a lower steel anchor cylinder (5) and a pull rope (6), wherein the bearing platform (1) is arranged on a pier column base below a concrete pier column (200), the steel sleeve shoes (2) are provided with at least four and are respectively arranged at the edge of the bearing platform (1), the bent cap anchor plate (3) is arranged on a bridge bent cap (100) arranged at the top end of the concrete pier column (200), the lower steel anchor cylinder (5) is in one-to-one correspondence with the steel sleeve shoes (2) and is hinged to the steel sleeve shoes (2), the upper steel anchor cylinder (4) is provided with at least four pull ropes (6) which are respectively arranged between the upper steel anchor cylinder (4) and the lower steel anchor cylinder (5) and are anchored; The steel sleeve boot (2) is provided with lower lug plates (7) through bolts or welding, the bent cap anchor plates (3) are provided with upper lug plates (8) which are consistent with the lower lug plates (7) in number through bolts or welding, the upper steel anchor cylinders (4) and the lower steel anchor cylinders (5) are provided with a plurality of upper lug plates (8) and lower lug plates (7) which are respectively arranged one by one, and the upper lug plates (8) are mutually perpendicular to the lower lug plates (7).
2. The post-earthquake resetting and reinforcing system for the reinforced concrete bridge pier according to claim 1, wherein two cover beam anchor plates (3) are arranged and are mutually clamped and fixed on the outer surface of the middle part of the bridge cover beam (100) through expansion bolts and adhesives.
3. The post-earthquake resetting and reinforcing system for the reinforced concrete bridge pier according to claim 1, wherein the steel sleeve shoes (2) are provided with four edges and corners of the bearing platform (1) are fixedly installed through expansion bolts and adhesives.
4. The post-earthquake resetting and reinforcing system for the reinforced concrete bridge pier according to claim 1, wherein the upper steel anchor cylinder (4) and the lower steel anchor cylinder (5) comprise anchor cylinder bodies, anchor bearing plates and anchor rollers arranged at the front end and the rear end of the anchor cylinder bodies, tensioning spaces are formed in the anchor cylinder bodies, the anchor rollers of the upper steel anchor cylinder (4) and the lower steel anchor cylinder (5) respectively penetrate through earholes formed in the upper earplates (8) and the lower earplates (7), two ends of a stay rope (6) respectively penetrate through the anchor bearing plates of the upper steel anchor cylinder (4) and the lower steel anchor cylinder (5) and then are fixed in the tensioning spaces, and tensioning adjustment can be performed on the stay rope (6) in the tensioning spaces of the upper steel anchor cylinder (4) and the lower steel anchor cylinder (5) through tensioning jacks.
5. A reset reinforcing method based on the post-earthquake reset reinforcing system of the reinforced concrete pier according to any one of claims 1 to 4, which is characterized by comprising the following steps: s1, designing steel sleeve boots (2), bent cap anchor plates (3), upper steel anchor cylinders (4), lower steel anchor cylinders (5) and inhaul cables (6) with proper specifications and quantity according to bridge pier sizes, reinforcement conditions and dead weight loads; S2, installing a bearing platform (1) on a pier column base below the concrete pier column (200), excavating corners of the bearing platform (1), and fixedly installing a plurality of steel sleeve boots (2) at the corners of the bearing platform (1) by adopting expansion bolts and adhesives; S3, mutually clamping the two bent cap anchor plates (3) and fixing the two bent cap anchor plates on the outer surface of the middle part of the bridge bent cap (100) through expansion bolts and adhesive; S4, a plurality of upper steel anchor cylinders (4) and lower steel anchor cylinders (5) are respectively hinged and fixed on the bent cap anchor plate (3) and the steel sleeve boots (2), the number of the upper steel anchor cylinders (4), the lower steel anchor cylinders (5) and the steel sleeve boots (2) is ensured to be consistent, and the upper steel anchor cylinders (4) and the lower steel anchor cylinders (5) are in one-to-one correspondence; S5, respectively installing two ends of a plurality of inhaul cables (6) on the upper steel anchor cylinder (4) and the lower steel anchor cylinder (5) and tensioning and anchoring the inhaul cables; s6, tensioning two ends of the inhaul cable (6) respectively through tensioning jacks in the upper steel anchor cylinder (4) and the lower steel anchor cylinder (5), and resetting and reinforcing of the concrete pier column (200) after earthquake can be achieved through selectively tensioning a plurality of inhaul cables (6).

Description

Post-earthquake resetting and reinforcing system and method for reinforced concrete bridge pier Technical Field The invention relates to the technical field of bridge engineering, in particular to a reinforced concrete pier post-earthquake resetting and reinforcing system and a method thereof. Background Large-scale and wide-scale small-span simply supported beam bridges and continuous beam bridges are the most important bridge forms in China. The displacement delay capability of the bridge pier is mainly focused on in the past anti-seismic design, and the earthquake displacement requirement of the bridge pier is smaller than the displacement capability of the bridge pier through design so as to ensure that the bridge structure is prevented from collapsing in the earthquake. After the actual earthquake, some bridges based on ductile design are prevented from collapsing in the earthquake, but the bridge is difficult to repair due to overlarge residual displacement of the pier top, so that the bridge can only be pushed over and reconstructed after the earthquake. In the earthquake of the sakashen, except for 250 piers collapsed, about 100 piers out of 591 piers slightly damaged have to be rebuilt by being pushed over after the earthquake because of excessive residual displacement of the pier tops (residual drift rate of the piers exceeds 1.75%). At present, a plurality of self-resetting pier structures are researched mainly including swinging piers, unbonded vertical prestressed piers and steel-super-elastic nickel-titanium reinforced concrete piers. However, the swinging pier is required to be provided with a pier bottom-bearing platform contact surface before the construction of the pier, the unbonded vertical prestressed pier is required to be reserved with a prestressed duct and a bearing platform bottom anchoring device before the casting of the pier concrete, and the steel-super-elastic nickel-titanium reinforced concrete pier is required to adopt super-elastic nickel-titanium reinforced concrete as longitudinal ribs in a pier bottom plastic hinge area before the casting of the pier concrete. The self-resetting pier structures cannot be directly used for improving the post-earthquake self-resetting capability of the existing reinforced concrete piers. Disclosure of Invention The invention aims to provide a post-earthquake resetting and reinforcing system and a post-earthquake resetting and reinforcing method for a reinforced concrete pier, so as to solve the defects. In order to achieve the above object, the present invention provides the following technical solutions: The utility model provides a reinforced concrete pier shakes back reinforcement system that resets, includes cushion cap, steel sleeve shoe, bent cap anchor board, goes up steel anchor section of thick bamboo, lower steel anchor section of thick bamboo and cable, the cushion cap sets up on the pier column base under the concrete pier column, steel sleeve shoe is provided with four at least and installs respectively cushion cap border department, the bent cap anchor board is installed on the bridge bent cap that is located concrete pier column top, lower steel anchor section of thick bamboo and steel sleeve shoe one-to-one and articulated install on steel sleeve shoe, go up steel anchor section of thick bamboo and be provided with four at least and install respectively on the bent cap anchor board, the cable is installed and is anchored between last steel anchor section of thick bamboo and lower steel anchor section of thick bamboo. Preferably, the steel sleeve shoe is provided with lower lug plates through bolts or welding, the bent cap anchor plate is provided with upper lug plates with the same number as the lower lug plates through bolts or welding, and the upper steel anchor cylinder and the lower steel anchor cylinder are provided with a plurality of upper lug plates and lower lug plates and are respectively arranged on the upper lug plates and the lower lug plates one by one. Preferably, two cover beam anchor plates are arranged and are mutually clamped and fixed on the outer surface of the middle part of the bridge cover beam through expansion bolts and adhesive. Preferably, the steel sleeve boots are provided with four and are fixedly arranged at four edge corners of the bearing platform through expansion bolts and adhesive. Preferably, the upper steel anchor cylinder and the lower steel anchor cylinder comprise anchor cylinder bodies, anchor bearing plates and anchor rolling shafts which are arranged at the front end and the rear end of the anchor cylinder bodies, tensioning spaces are formed in the anchor cylinder bodies, the anchor rolling shafts of the upper steel anchor cylinder and the lower steel anchor cylinder respectively penetrate through earholes formed in the upper earplates and the lower earplates, two ends of a inhaul cable respectively penetrate through the anchor bearing plates of the upper steel anchor cylinder a