Device for measuring out-of-pipe overexcavation amount of rock jacking pipe

Abstract

The invention discloses a device for measuring the out-of-pipe overexcavation amount of a rock jacking pipe, which comprises a supporting base fixed on the inner pipe wall at the bottom of a concrete jacking pipe, an electric drive hydraulic jack is arranged at the top of the supporting base, and the top end of the electric drive hydraulic jack is fixedly connected with a measuring piston cylinder through a pressure sensor; a through hole is formed in the concrete top pipe at the top of the measuring piston cylinder, a piston cylinder wall is arranged at the position of the through hole, the measuring piston cylinder extends into the piston cylinder wall, a displacement scale is arranged on the outer wall of the lower portion of the measuring piston cylinder, and the pressure sensor is connected with a computer terminal through a wire. The hydraulic jack is electrically driven to push the measuring piston cylinder to move, so that the measuring piston cylinder is in contact with surrounding rock outside a jacking pipe, and the pressure change condition is measured through the pressure sensor and is displayed on the computer terminal, so that the contact condition outside the pipe and the overexcavation amount can be measured anytime and anywhere; by measuring the moving distance of the piston cylinder, the out-of-pipe overexcavation amount can be continuously and directly obtained.

Description

technical field [0001] The invention relates to a device for measuring the overbreak amount outside a rock pipe jacking pipe, and belongs to the technical field of pipe jacking engineering. Background technique [0002] In pipe jacking construction, in order to meet the needs of deviation correction and drag reduction, there should be a certain amount of overbreak, but under the condition of meeting the needs of deviation correction and drag reduction, the amount of overbreak should be reduced as much as possible to avoid increasing the amount of soil discharge and surface settlement. The existing domestic pipe jacking is basically soil pipe jacking. The mechanical strength of the soil itself is lower than that of the rock mass, and the pipe jacking will come into direct contact with the soil after excavation. Therefore, external grouting is usually used to reduce the movement resistance of the pipe jacking. [0003] The mechanical mechanism of drag reduction by grouting ou...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the pipe jacking method: the pipe joint moves forward together with the excavation footage as a whole closed structure, and the construction site cannot directly contact the surrounding rock.

If you want to measure the overbreak or the convergence of surrounding rock outside the pipe jacking pipe, and determine the maximum gap distance between the pipe and rock, you need to drill the pipe jacking, which will affect the original force characteristics and construction period of the pipe jacking structure. , cost, etc. have serious adverse effects on

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