Process for reinforcing adjustable and controllable capping beam of piers

Abstract

The invention discloses a process for reinforcing adjustable and controllable capping beam of piers, comprising the following steps: (1) engraving shearing force grooves on the surface of the original capping beam concrete according to the design, embedding reinforcing steel bars and chiseling; (2) mixing plant fiber and steel fiber with the newly poured capping beam concrete, wherein the plant fiber is mixed in order to prevent the early shrinkage and crack of the concrete, and the steel fiber is mixed in order to prevent the later-stage stressed crack of the concrete; (3) leaving a certain area for secondary pouring in the middle in advance, wherein the area is 1 / 3 the length of the capping beam; (4) jacking capping beams by using two ends of a jack, and adjusting the reasonable load born by the new capping beam and the old capping beam according to a certain proportion by controlling the force and the jacking height of the jack to adjust the internal force of structures according to the design; (5) transferring the internal force of the basic part of the old structure to the basic part of the newly added structure by jacking; and (6) transferring partial or whole load born by the capping beam of the old biers to the new piers and the combined new and old capping beam structure by controlling the number and the position of prestressed steel strands to adjust the proportion of the whole load born by the combined new and old capping beam structure.

Description

technical field [0001] The invention relates to a process method for reinforcing an old bridge pier cover beam, in particular to an adjustable and controllable bridge pier cover beam reinforcement process method. Background technique [0002] In the reinforcement of old bridges, the following situations are often encountered: [0003] When the pile-soil bearing capacity is insufficient, conventional reinforcement methods are pile tip or pile side grouting, etc. [0004] When there are defects in the pile body or the bearing capacity is insufficient, the conventional reinforcement method is to add pile foundation caps or steel pipe piles. [0005] When the bearing capacity of the platform is insufficient, the conventional reinforcement method is to attach steel plates or carbon fiber cloth to the top and bottom of the platform and the sides. [0006] When the bearing capacity of the pier column is insufficient, the conventional reinforcement method is to attach steel plates...

AI Technical Summary

Problems solved by technology

[0008] However, when five or more situations occur at the same time, such as insufficient pile-soil bearing capacity, defects in the pile body or insufficient bearing capacity, insufficient bearing capacity of the cap, insufficient bearing capacity of the pier column, and insufficient bearing capacity of the cap beam, etc. Reinforcement, reinforcement will be extremely cumbersome, and the construction period will be long; what is more unfavorable is that the above reinforcement is passive reinforcement. When the bridge is in normal use, the newly added reinforcement measures only bear a small amount of live load, and its stress level is small. The dead load of the entire structure and most of the live load is borne by the old structure, its stress level is high, and its reinforcement effect is difficult to evaluate

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