Installation method of safety monitoring instrument for working well in ultra-deep overburden layer

Abstract

The invention discloses a method for installing a working well safety monitoring instrument formed by an ultra-deep overburden ground connection wall. Clean water is injected into a pre-buried inclinometer pipe to balance the pressure of the super-high mud-water mixture on the outside, so as to prevent the pre-buried inclinometer pipe from being damaged. It is extruded and deformed to ensure its normal work. By installing fixed pulleys on the top of the upper steel cage, the lead-out cables of the monitoring instruments can be laid quickly, and the construction efficiency of the cable laying of the instruments can be improved. Using the air pump + cylinder as the power drive, the remote control earth pressure gauge is actively ejected, and it is in reliable contact with the measured soil, which is convenient and reliable. The active ejection process of the earth pressure gauge can be mutually verified by the hand-held reading instrument and the exhaust inspection water tank, reflecting the air pumping process. The V-shaped base can remove the protruding soil clods on the side of the measured soil during the descent process. Under the ultra-high-density mud-water mixture, avoid the sensing surface of the earth pressure gauge from being wrapped by concrete and make it invalid, and ensure that the sensing surface can reliably push against the measured soil and accurately reflect the pressure of the soil on the surrounding working well.

Description

Technical field [0001] The present invention belongs to the field of geotechnical safety monitoring technology, which relates to a working well safety monitoring instrument installation method of condensation in an ultra-deep cover layer. Background technique [0002] In recent years, China has vigorously developed underground project construction, and more and more underground projects, including underground shopping malls, underground civil defense projects, subway tunnels, hydraulic tunnels, etc. The construction of underground project is inseparable from the base pit excavation. It is generally believed that the depth of the foundation pit excavation is 5m and above is a deep basis pit, some large water-water project work well, foundation pit excavation of 50m or more, It belongs to the level of an ultra-deep foundation pit. During the construction of the ultra-deep foundation pit, the periphery of the working well formed by the underground continuous wall will be affected by...

AI Technical Summary

Problems solved by technology

[0003] Due to the construction of ultra-deep overburden foundation pits, construction methods such as layered hoisting of steel cages and high-density mud-water mixed retaining walls are usually used, resulting in conventional construction methods such as deformation monitoring and soil pressure monitoring that are no longer applicable to ultra-deep foundation pits installation of safety monitoring equipment

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