Pore water pressure gauge deep-layer embedded device

Abstract

The invention discloses a pore water pressure gauge deep-layer embedded device which comprises a steel tube (1), a string (3), a cable (5), a sleeve (6), a clip (7) and a pore water pressure gauge (9). The pore water pressure gauge deep-layer embedded device is light and handy in structure, easy to operate, good in quality and high in efficiency.

Description

Technical field [0001] The invention belongs to the technical field of civil engineering and relates to a pore water pressure gauge embedding device. Background technique [0002] In soft soil foundations, pore water pressure gauges are generally buried through boreholes, and mud is used to protect the walls during the hole formation process to keep the hole walls stable. Since the hole diameter is easy to shrink after the hole is formed in the soft soil, and the mud in the hole will also generate floating force on the lowered pore pressure gauge and its signal cable, the buried quality of the pore pressure gauge has the following problems: (1) ) The signal cable with the length mark is a non-rigid scale, which sometimes misleads the embedding depth, and the pore pressure gauge may not reach the set depth. Therefore, the measured pore pressure may not necessarily be the pore at the designed depth. Water pressure; (2) The pore water pressure gauge cannot be centered in the hole, ...

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Problems solved by technology

Since the pore diameter is easy to shrink after the hole is formed in soft soil, and the mud in the hole will also generate a buoyancy force on the lowered pore water piezometer and its signal cable, so the buried quality of the pore water piezometer has the following problems: (1 ) The signal cable marked with the length mark is a non-rigid scale, which sometimes misleads the buried depth, causing the pore water pressure gauge to fail to reach the set depth, so the measured pore water pressure is not necessarily the pore of the soil layer at the design depth Water pressure; (2) The pore water pressure gauge cannot be centered in the hole, and the joint between the pore water pressure gauge and the signal transmission line is not protected. There is a certain damage rate during the embedding process, which will cause the buried pressure gauge to lose its proper measurement (3) The data measured by the pore water pressure gauge cannot truly reflect the actual pore water pressure of the set soil layer due to the interference of the buried quality

Du Ce et al. proposed a deep embedding device for pore water piezometers, which can solve the above problems, but the structure of the device is complex and heavy, and the production process requirements are strict; the requirements for the diameter of the borehole are too large, the installation and embedding process is cumbersome, and the cost is high. restrict its promotional use

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