Method for embedding optical fiber for testing internal force of cast-in-place pile by acoustic testing pipe

Abstract

The invention discloses a method for embedding an optical fiber for testing internal force of a cast-in-place pile by an acoustic testing pipe. The method comprises the following steps that 1, an optical fiber embedding device is manufactured; 2, a steel wire rope is connected with the optical fiber embedding device, and the optical fiber is wound; 3, the optical fiber is bound; 4, the acoustic testing pipe is grouted; 5, the optical fiber is lifted downward; and 6, the steps 1 to 5 are repeated to complete the embedding of the optical fiber in the other acoustic testing pipe. According to themethod, the design is reasonable, the influence on the construction of the cast-in-place pile is less, the accuracy of strain test of the cast-in-place pile is ensured, and the subsequent analysis ofthe internal force of the cast-in-place pile is convenient.

Description

technical field [0001] The invention belongs to the technical field of fiber optic implantation in cast-in-situ piles, and in particular relates to a method for implanting optical fibers for testing the internal force of cast-in-place piles by using an acoustic measuring tube. Background technique [0002] In recent years, distributed optical fiber technology has been applied to test the internal force of cast-in-place piles. The distributed optical fiber method belongs to the line measurement method, which can obtain the strain values ​​along different depths of the pile body to obtain the internal force. Compared with the steel bar meter method, the test data is more, and it can better reflect the continuous strain change law of the pile body, and has broad application prospects. At present, the installation of optical fiber is often carried out during the hoisting process of cast-in-place pile construction. Specifically, when the steel cage is lowered, the optical fiber i...

AI Technical Summary

Problems solved by technology

At present, the installation of optical fiber is often carried out during the hoisting process of cast-in-place pile construction. Specifically, when the steel cage is lowered, the optical fiber is inserted into the steel cage, laid along with the main reinforcement, and fixed at intervals. The cross effect is serious, which greatly increases the interval time from the hole formation of the cast-in-situ pile to the pouring of concrete, and increases the risk of pile hole collapse

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