An openable and closable tunnel advanced water pressure and water volume detection device

Abstract

A self-sealing advanced water pressure and water flow detection device for a tunnel comprises an openable plugging device, a telescopic water guiding device and a water pressure and water flow measuring device which are connected sequentially. Before detection, a horizontal advanced drilling machine is used for drilling a hole to the position required to be detected, and a soft stratum adopts casing pipes for wall protection. The device extends into the detection hole, a front-end casing pipe abuts against the hole bottom, a central casing pipe is pushed inwards continuously, and the front-end casing pipe and a first-section casing pipe move relative to each other, so that a steel bracket drives a rubber piece to be stretched, and a closed space is formed. A buckle on the first-section casing pipe is buckled in a groove of the front-end casing pipe, and a sealing device is in the working state. After pipe sections are full of water, a valve at the back end is closed, and water pressure is measured by the aid of a water pressure gauge; the valve is opened, and the water flow is measured by the aid of a water flow machine; and pore water pressure of a front-end stratum is measured by the aid of a most-front-end pore water pressure sensor. After measurement is completed, the central casing pipe is pushed inwards continuously until the buckle is released from the groove, the steel bracket can be loosened after the central casing pipe is rotated, and the whole device is released.

Description

technical field [0001] The invention relates to a tunnel advanced water pressure and water volume detection device, which is suitable for tunnels in various soil layers and rock layers, and is especially suitable for the advanced detection of hydraulic pressure and water volume when mining method tunnels pass through high hydraulic pressure fracture zones. The invention belongs to the technical field of civil engineering site detection. Background technique [0002] In tunnel construction, groundwater is one of the biggest sources of risk, and it is an important cause of excavation surface collapse and ground subsidence. Especially in the case of fault fracture zones and dense strata joints, inrush water is likely to occur. Engineering accidents caused by unidentified groundwater detection or improper treatment are common, resulting in huge economic losses. The geological survey before the construction of the project cannot fully reflect the geological conditions, especiall...

AI Technical Summary

Problems solved by technology

The traditional advanced drilling method for water detection is mostly based on the oil pressure of the oil pump of the drilling rig, the water pressure of the orifice, and the flow rate to estimate the head pressure and water inflow, which is highly dependent on experience and has low reliability.

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