Device for testing pile bottom stress of bored concrete pile

Abstract

The invention relates to a device for monitoring the pressure and bearing capacity of soil at the pile bottom of a bored concrete pile, particularly relating to a device for testing the pile bottom stress of a bored concrete pile; the device comprises a pressure box, a flexible rod, a guide tube, an elastic ring and an observation cable, wherein the lower end of the elastic ring is connected with the flexible rod, the other end of the flexible rod is connected with the pressure box, the guide tube is sleeved outside the flexible rod, the observation cable is connected with the pressure box along the flexible rod. The device of invention has simple structure and convenient installation, the flexible property of the elastic ring ensures that a reinforcement cage has good buffering and protecting functions on the pressure box in piling process and the elastic deformation accumulated by the elastic spring gradually releases in the height fine adjustment process to push the pressure box to tightly contact with soil at the pile bottom. The invention can effectively monitor the stress state of the pile bottom, the process is reliable, the cost is low and the practical application effect is good.

Description

technical field [0001] The invention relates to a device for testing soil pressure and bearing capacity at the bottom of cast-in-situ piles, in particular to a stress test device at the bottom of cast-in-place piles. Background technique [0002] Cast-in-situ piles are often used in the foundation engineering of high-rise buildings and large bridges to fully transfer the superstructure load to the deep soil layer, thereby solving engineering problems such as bearing capacity and settlement of large buildings. The bearing capacity of a pile includes two parts: the pile side bearing capacity and the pile bottom bearing capacity. The development process of each part's bearing capacity and the determination of the ultimate bearing capacity are important issues in engineering design and construction. The monitoring of pile bottom stress is of great significance for understanding the working state of cast-in-situ piles, safety monitoring and feedback design. [0003] It is more a...

AI Technical Summary

Problems solved by technology

[0005] The pile bottom stress testing device for cast-in-place piles provided by the present invention solves the above-mentioned problems in the prior art that the pressure box cannot be installed effectively or the steel bar meter is used to cause large errors in monitoring results, low testing accuracy, and difficult analysis.

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