Tunnel vault second lining concrete vacuum auxiliary pouring method

Abstract

The invention provides a tunnel vault second lining concrete vacuum auxiliary pouring method, and belongs to the technical field of tunnel construction. The tunnel vault second lining concrete vacuumauxiliary pouring method comprises the following steps that a lining trolley is in place, and an end formwork, an exhaust pipe and a concrete conveying pipe are installed and sealed; a completed vaultsecond lining is in contact with one end of a vault formwork, the end formwork is connected to the other end of the vault formwork, the concrete conveying pipe above the end formwork is arranged at the top of a concrete reinforcing layer and located above the vault formwork, and a sealing ring matched with a vault main steel bar is arranged on the inner side of the reserved hole, matched with thevault main steel bar, in the end formwork; the exhaust pipe communicates with a vacuum pump, the concrete conveying pipe communicates with a conveying pump, and second lining concrete pouring is carried out; and after final setting of concrete, the end formwork, the vacuum pump and the concrete conveying pipe are removed. A vacuum pumping auxiliary method is used for pouring the tunnel vault second lining concrete, the quality defects such as insufficient thickness, structural variation and low strength of concrete pouring at the vault position are overcome, so that the structure of the vaultposition of a tunnel is more in line with a design intention, and the bearing capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and more specifically relates to a method for vacuum-assisted pouring of tunnel vault second lining concrete. Background technique [0002] With the rapid development of tunnel engineering technology, since the 1990s, the waterproof board + drainage blind pipe technology has been gradually promoted to effectively control the water leakage of the tunnel vault; the lining trolley + pumping concrete technology is used to replace the original arch + small The arch first and wall later technology of formwork + manual loading has realized the rapid construction of the entire section of the second concrete lining of the tunnel, and the comprehensive construction quality has been greatly improved. [0003] The lining trolley is composed of movable support frame, vault formwork, side wall formwork and end formwork, etc. The design length of the trolley is 9m or 12m. Attached vibrators are arr...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a vacuum-assisted pouring method for the second lining concrete of the tunnel vault, so as to solve the phenomenon that the highest part of the second lining concrete of the tunnel vault is separated from the vault in the prior art, which causes the vault top Technical Problems of Decreasing Carrying Capacity of Bit Structure

Images