Bridge supplementary pile preloading consolidation method

Abstract

The invention provides a bridge supplementary pile preloading consolidation method which comprises the steps that a supplementary pile reinforcing cage is primarily manufactured, and pressure sensors are distributed; holes are formed in the periphery of an original pile, the supplementary pile reinforcing cage placed underground to be poured with concrete to be a supplementary pile after forming; jacks and main reinforcing sleeve pipes are buried in advance; concrete is poured into a bearing platform reinforcing cage which can be an added bearing platform after curing time; the supplementary pile is progressively pressed in advance in a multiple level mode; if the supplementary pile has rapid settlement or is unstable for a long time or is raised is judged; if yes, loading is paused or stopped, causes need finding out, if not, the supplementary pile is pressed in advance until the supplementary pile reaches the largest pre-pressing load, and finally preloading is completed; glue injection is carried out for sealing; the supplementary pile continues to be monitored for a period, and construction is completed until a value of the pre-pressing of the supplementary pile is stable. The bridge supplementary pile preloading consolidation method can effectively solve the conversion problem of stress between the supplementary pile and the original pile, and a bridge pier foundation with insufficient bearing capacity can be effectively reinforced.

Description

【Technical field】 [0001] The invention relates to a method for preloading and strengthening bridge supplementary piles. 【Background technique】 [0002] With the increasing development of my country's national economy, the traffic volume is also growing rapidly. The bridge is the throat of highway traffic, and its quality directly affects the smooth flow of the entire line. With the increase of the service life of bridges and the increasing load of bridges, many bridges in our country have been damaged, and the total number of kilometers of dangerous bridges is astonishing. There are several reasons for this: the impact of natural environment, poor construction quality, changes in actual traffic composition and the impact of overloaded vehicles. These have led to the fact that many bridges cannot reach the service life of the original design and become dangerous bridges. If they continue to be used, engineering accidents will easily occur. Among them, the insufficient bear...

AI Technical Summary

Problems solved by technology

Therefore, for the traditional method, the settlement of the new pile will increase the burden on the existing old pile foundation, and the time period of deformation development is difficult to control

The reason for the above problems is mainly that the stress and strain states of the old and new pile foundations are different at the pile tip or around the pile, and the exertion of the bearing capacity is based on a certain relative displacement of the pile and soil (that is, settlement), that is, In other words, the bearing capacity of the new piles requires further expansion of the settlement of the old piles, and then the two can gradually coordinate and jointly resist the upper load, which is very unfavorable to the reinforcement effect of the bridge.

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