A construction method for strengthening the existing abutment structure by adding piles and enlarging the abutment cap

Abstract

The invention discloses a combination of supplementary piles and enlarged abutment caps to strengthen the existing abutment structure, which is characterized in that it includes the original abutment abutment cap, the newly added abutment cap part, the original pile foundation, the newly added pile foundation, and the original ear-back wall , new ear-back wall, new block, and new soil retaining board; the newly added pile foundation is set on the outside and rear of the original pile foundation, and the newly added pile foundation is connected to the original pile foundation through the newly added platform cap; the top of the original platform cap is provided with Grouting holes and vent holes, planting bars, new blocks and new retaining plates; the newly added abutment cap is connected to the original abutment cap through planting bars. The invention fully utilizes the structure of the original pile foundation, connects the newly added part with the original abutment structure by implanting steel bars, strengthens the cooperative bearing capacity of the old and new structures, improves the overall bearing capacity of the bridge, and has good economic and technical benefits . The invention also discloses a construction method for reinforcing the built bridge abutment structure by combining supplementary piles and enlarged abutment caps.

Description

technical field [0001] The invention relates to a combined reinforcement of supplementary piles and enlarged platform caps which can simultaneously improve the bearing capacity and integrity of old and new pile foundations and platform caps, and reduce longitudinal cracks at the junction of new and old pile foundations and platform caps due to differential bearing. Construction of abutment structures and construction methods. Belonging to the field of bridge engineering, it is suitable for pile foundation reinforcement construction projects in various bridge projects, especially for reinforcement and reinforcement projects for reconstruction and expansion bridges, bridge piers and bridges with excessive longitudinal displacement of bridge abutments. Background technique [0002] At the same time as large-scale new bridge construction, old bridge renovation projects are also being implemented continuously. The renovation of existing buildings has been promoted to a prominent ...

AI Technical Summary

Problems solved by technology

When supplementing piles is adopted, although the vertical load of a single pile can be reduced, generally the supplementary piles can only be added on the periphery of the pile group, which will easily lead to irregular arrangement of the pile group. When the pile group is simplified to a plane rigid frame model, the A rigid frame with a large span and a small number of columns is formed in a certain direction, resulting in a large force, and it becomes the control pile in the pile group, which is unreasonable for the force of the pile group

The in-situ reconstruction method is to re-drill the pile body at the original pile position. This method has a long construction period and a large movement of the soil around the pile, which is not conducive to the exertion of the bearing capacity of the pile side soil.

[0005] To sum up, although there are some methods in the project that can be used to deal with the problems of aging structure, insufficient bearing capacity and various defects of the built abutments, most of them need to destroy the original bridge structure and take temporary traffic control measures such as road closures , it is difficult to apply to road sections with small bridge width or high traffic saturation; in the case of existing bridges, increasing the number of piles to reinforce the pile group method and in-situ reconstruction method are difficult to solve the problem of load transfer path and bridge integrity

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