Self-balancing method used for single pile vertical compressive static load and pile negative friction detecting

Abstract

The invention relates to a self-balancing method used for single pile vertical compressive static load and pile negative friction detecting. The self-balancing method comprises the steps of S1, welding, wherein a reinforcement cage and self-balancing load boxes are welded; S2, embedding, wherein the welded reinforcement cage and self-balancing load boxes are placed in a pile well together, reinforcement meters re placed, and displacement inhaul cables, a vertical protection pipe A and a vertical protection pipe B are arranged; S3, building of a datum beam tower and arranging of displacement sensors; S3, measuring, wherein measuring is carried out under the loading condition and the unloading condition; and S4, calculation, wherein single pile vertical ultimate bearing capacity is obtainedthrough calculation, a traditional pile top Q-s curve is calculated and formed, and the steel bar strain capacity is obtained through calculation. The self-balancing method has the beneficial effectsthat pile vertical compressive static loads and pile negative friction can be detected at the same time, the lateral friction of stratum can be fully utilized, data can be measured through the reinforcement meters, the measuring precision is high, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of mounting plate structures, in particular to a self-balancing method for detecting the vertical anti-compressive static load of a single pile and the negative friction resistance of the pile. Background technique [0002] In civil engineering, the methods of measuring pile bearing capacity in pile foundation engineering usually include static load pile measurement method and high strain dynamic measurement method. In the high strain measurement method, there are more than ten subdivision methods, but the accuracy is not high. [0003] The existing pile side friction test mainly relies on surcharge combined with the steel bar meter embedded in the pile body to test, which has two problems: Problem 1. If the pile side friction resistance is to be fully exerted, the traditional surcharge method requires a lot of The counterweight, the hoisting and transportation of the counterweight require a lot of cost, an...

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Problems solved by technology

In the high strain measurement method, there are more than ten subdivision methods, but the accuracy is not high

[0003] The existing pile side friction test mainly relies on surcharge combined with the steel bar meter embedded in the pile body to test, which has two problems: Problem 1. If the pile side friction resistance is to be fully exerted, the traditional surcharge method requires a lot of The counterweight, the hoisting and transportation of the counterweight require a lot of cost, and the site requirements are high; the second problem is that the closer the pile side friction is to the top of the pile, the more fully it can play, and the part closer to the bottom of the pile can reduce the pile side friction. It cannot be fully utilized, resulting in small measured data, and this part of the soil around the pile can often provide huge pile side friction

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