Device for quickly measuring tunnel primary support back cavity

Abstract

Disclosed is a device for quickly measuring a tunnel primary support back cavity. The device comprises an outer cylinder, a push rod, a transmission mechanism and a measuring tape, one end of the pushrod penetrates into one end of the outer cylinder and can slide relative to the outer cylinder, the transmission mechanism is arranged in an inner cavity of the outer cylinder, and the end, penetrating into the outer cylinder, of the push rod is connected with the power input end of the transmission mechanism; the measuring tape is arranged at the other end of the outer cylinder and connected with the output end of the transmission mechanism, and a rotating shaft of the measuring tape is parallel to the axis of the outer cylinder; the transmission mechanism can convert axial movement of the push rod into rotation of the measuring tape rotating shaft, and scale marks are arranged on the portion, exposed out of the outer cylinder, of the push rod. The device is convenient to operate, the detection cost is effectively reduced, the working efficiency is improved, and compared with a traditional device, the device has the advantages that the size of a tunnel primary support back cavity isgiven in a specific quantity mode for the first time.

Description

technical field [0001] The invention belongs to the field of tunnel engineering detection instruments, and in particular relates to a device for quickly measuring the cavity on the back of a tunnel primary support. Background technique [0002] With the continuous optimization of design standards and construction technology in my country's highway industry, the requirements for engineering quality are becoming more and more stringent. The road tunnel is an important part of the highway, and the construction quality of the road tunnel is directly related to the safety of life and property of the people passing through the tunnel. In recent years, the problems of road tunnel diseases in my country have become increasingly prominent. The occurrence of water leakage, lining circumferential cracks, longitudinal cracks, tunnel bias and other diseases indirectly reflects the quality control problems in the tunnel construction process. During tunnel excavation and support, when the...

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Problems solved by technology

[0011] Although the visual method is simple and fast, it is greatly affected by the subjective factors of the observer, and is easily disturbed by the environmental factors of the tunnel construction. At the same time, the relatively closed construction environment makes a large amount of dust suspended in the air, which will accelerate the shortening of the service life of the instrument. Secondly, the camera must be cleaned at the end of each drilling measurement, so the detection speed is slow; the last two The method can only make a qualitative judgment, but the degree of hollowness on the back of the primary branch cannot be given in the form of quantity

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