Argillaceous sandstone geological pipe jacking construction process

Abstract

The invention discloses an argillaceous sandstone geological pipe jacking construction process. The process comprises the following steps of adopting a thixotropic slurry system to inject thixotropicslurry circumferentially into a concrete pipe, specifically, the concrete pipe comprises a plurality of pipe joints, slurry sleeves are arranged on the pipe joints at the head, slurry sleeves are arranged on the pipe joints in the middle at intervals, grouting holes are distributed in the slurry sleeves in the circumferential direction, and the thixotropic slurry system comprises a grouting pump and a grouting pipeline; mixing grouting materials with water and then stirring to obtain the required slurry during mixing the slurry, and using the slurry after standing for 24 hours; and grouting with the grouting pump, using a pressure gauge and a flow gauge to control the grouting pressure to be 1.1-1.2 times the water depth in the grouting process, and simultaneously controlling the groutingquantity, wherein the grouting pipeline comprises a main pipe and a plurality of branch pipes connected with the main pipe, and the branch pipes convey the slurry fed by the pressure in the main pipeto each grouting hole. Besides the slurry sleeves at the head of a tool for pressure feeding of slurry, the slurry sleeves are additionally arranged on the middle pipe joints, so that a slurry supporting ring belt around the pipe is formed through the slurry sleeves.

Description

technical field [0001] The invention belongs to the technical field of electric power construction, and in particular relates to the construction technology of electric cable tunnels. Background technique [0002] In the development of large cities abroad, it has become a world trend to replace traditional overhead lines with underground cables. With the rapid development of urbanization in our country, the space left for overhead lines in the upper part of the city is getting smaller and smaller. Overhead lines have been increasingly unable to keep up with social needs in terms of application space and transmission capacity. Therefore, from the perspective of actual transmission power and aesthetics, it has become necessary to use underground cables to replace overhead lines. From a functional point of view, the use of cable lines can avoid the restriction of overhead lines on the growth height of green trees, and does not occupy urban ground space. [0003] Although the...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an argillaceous sandstone geological pipe jacking construction technology to solve the problem of unsatisfactory drag reduction effect of thixotropic mud in sandy soil

Images