Distributed measurement device and method of pile body deformation of cast-in-place X-type pile

Abstract

The invention discloses a distributed measurement device and method of pile body deformation of a cast-in-place X-type pile. The distributed measurement device comprises the cast-in-place X-type pile, a fiber strain tester, reinforcing steel bars and single-mode fibers. The single-mode fibers are laid inside the reinforcing steel bars, the reinforcing steel bars are arranged at the outer edge of the cast-in-place X-type pile in a cast mode, and the fiber strain tester is connected with the single-mode fibers. The new measurement method includes the steps of arranging the single-mode fibers at the outer edge of the cast-in-place X-type pile, receiving Brillouin back scattered light at the pulsed light incidence ends of the single-mode fibers through the Brillouin optical time domain reflecting technology, completing the measurement and positioning functions of Brillouin frequency shifting of points on the single-mode fibers by analyzing the power of Brillouin back scattered light, and then obtaining deformation of the cast-in-place X-type pile to be measured. Strain measurement is carried out on the cast-in-place X-type pile through the single-mode fibers, and the survival rate of fiber sensors is remarkably improved; meanwhile, the method has the advantages of being high in measurement accuracy, small in shifting, good in stability and the like; in addition, the method further has the advantages that the sensors are easy to arrange, wires connected with the sensors are fewer, and the construction technology is simple.

Description

technical field [0001] The invention relates to a pile measuring device and method, in particular to a distributed measuring device and method for cast-in-situ X-shaped pile body deformation. Background technique [0002] The cast-in-place X-shaped pile technology uses an X-shaped steel mold to replace the traditional round steel mold of the immersed tube pouring pile, so as to cast an X-shaped cast-in-place concrete pile. Compared with the traditional round pile with the same cross-sectional area, the perimeter of the cross-section of the X-shaped pile is significantly increased, and the specific surface area of ​​the unit material is also significantly increased. Thereby, the purpose of saving pile body material and improving the bearing capacity of material per unit volume is achieved. At present, the measurement of the deformation of the pile body of the pile foundation is mainly point detection, that is, pre-embedded strain gauges such as steel bar gauges, strain gauge...

AI Technical Summary

Problems solved by technology

[0004] In order to make up for the problems of discontinuity detection, easy missed detection, and easy damage of electronic components in

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