Method for improving flatness of tunnel initial spraying concrete

Abstract

The invention discloses a method for improving the flatness of initial spraying concrete of a tunnel, and relates to the technical field of tunnel construction, and the method for improving the flatness of the initial spraying concrete of the tunnel comprises the following steps: S1, vertically inserting more than three anchor rod devices with adjustable lengths into bed rock of the tunnel; s2, a reflective leveling line is arranged in a pulling mode, and the reflective leveling line is supported at the top ends of all the anchor rod devices; the lengths of all the anchor rod devices are adjusted according to the thickness and flatness of a primary support spraying layer required by tunnel design; and S3, spraying the primary support spraying layer, and enabling the top surface of the primary support spraying layer to be flush with the reflective leveling line. According to the method for improving the flatness of the tunnel initially-sprayed concrete, it can be guaranteed that the flatness of the initial support meets the requirement in the initial support concrete spraying process.

Description

technical field [0001] The present application relates to the technical field of tunnel construction, in particular to a method for improving the smoothness of primary shotcrete in tunnels. Background technique [0002] In the process of tunnel construction, the smoothness of the initial support of the tunnel is the key to the quality control of the tunnel construction. The smoothness of the initial support of the tunnel is closely related to the quality of the secondary lining of the tunnel, and the secondary lining of the tunnel has strict testing requirements. For a long time, the defect rectification of high-speed railway tunnels has always been a key factor that plagues the safe operation of railway lines, and the quality control of the smoothness of the initial support of the tunnel directly affects the construction quality of the secondary lining of the tunnel, such as insufficient thickness of the secondary lining, voiding at the back Such serious quality defects thr...

AI Technical Summary

Problems solved by technology

[0003] The main factor of the poor flatness of the initial branch of the tunnel lies in the control of smooth blasting, which is also subject to changes in geological conditions and the control is very unstable, so the bedrock surface blasted out is often difficult to achieve the required flatness

After blasting, concrete spraying is required, and the initial support sprayer is limited by the harsh construction environment of the spraying operation, which often makes the initial support leveling difficult to meet the standard. In addition, the manual initial support surface leveling process is time-consuming and labor-intensive and easy to invade limit, the effect is very unsatisfactory

Images