A method for monitoring soil pressure and displacement of micro-steel pipe piles

Abstract

The invention belongs to the technical field of pile foundation engineering field tests, and relates to a method for monitoring the soil pressure and displacement of a miniature steel pipe pile body. The hole is drilled at a predetermined position outside the pile body and the thickness of welding is slightly lower than that of the XY-TY02A resistance miniature soil pressure gauge. The metal protective shell of the sensor is attached to the pile body, and the XY‑TY02A resistive miniature earth pressure gauge is pasted on the pile body. The transmission line of the XY‑TY02A resistive miniature earth pressure meter is led out from the steel pipe pile through the sensor installation hole to communicate with the data acquisition system, and is connected to the micro The steel pipe pile preset position is welded with reflective sheet base and pasted with reflective sheet to realize displacement monitoring. The device adopted is simple in structure, simple and convenient in operation, reliable and stable, high in measurement accuracy and survival rate, low in cost, saves manpower, material resources and time, and can monitor in real time The change of earth pressure of the micro-steel pipe pile support of rock-soil foundation pit provides experimental data for on-site monitoring of the micro-steel pipe pile support theory of rock-soil foundation and provides reference value for engineering practice.

Description

Technical field: [0001] The invention belongs to the technical field of pile foundation engineering site tests, and relates to a method for monitoring the soil pressure and displacement of a micro-steel pipe pile, which simultaneously measures the soil pressure of the micro-steel pipe pile and the displacement under the action of water and soil pressure. and actual engineering to provide reference value. Background technique: [0002] Miniature steel pipe piles generally refer to cast-in-place piles with a pile diameter of 100-300mm and a length-to-diameter ratio greater than 30, which adopt the construction technology of drilling strong reinforcement and pressure grouting. Only light construction machines are needed during construction, flexible pile layout, fast construction speed, strong adaptability to the construction site, and small impact on the environment. Therefore, micro-steel pipe piles with soil nails, advanced micro-pile composite soil nail support of anchor r...

AI Technical Summary

Problems solved by technology

At present, the soil pressure detection of micro-steel pipe piles is mostly applied by pasting strain gauges on the pile body, but it is easy to be affected by moisture, the survival rate is low, and the sealant cannot have air bubbles. The equipment for monitoring the displacement of micro-steel pipe piles or Most of the methods use inclinometer tubes. In order to successfully install the inclinometer tubes in place, it generally needs to be deeper than the installation depth. It is more troublesome to adjust the direction, requiring more manpower and high cost. When the output port transmits data, the acquisition port must be free.

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