Construction method for pouring tunnel second lining self-compacting concrete

Abstract

The invention provides a construction method for pouring tunnel second lining self-compacting concrete. Firstly, pouring is conducted from a waist window on the single side for storage, and then a top pouring mode is switched. The construction method comprises the steps that a ground pump pipe is arranged for storage, specifically, after formwork erection of a trolley is finished, the pump pipe is connected into the trolley, and the pump pipe is guided to an observation window on one side through a hose for storage; concrete at the bottom of formworks is poured, specifically, the concrete poured from the single side for storage flows from one side to the other side till the lower observation window is closed; and pipe switching is conducted, specifically, the hose is moved out from the side pouring window and connected with a corresponding top pouring hole till pouring is finished. By the adoption of the construction method, on one hand, applicability selection of the ground pump power in the pouring process of an all-round-formwork trolley of the self-compacting concrete is achieved; and on the other hand, reinforcing bar reveal and retention of the bottom concrete are effectively avoided, finally the construction quality of concrete structure formation is improved, and the construction efficiency is improved.

Description

technical field [0001] The invention belongs to underground engineering, in particular to a construction method of self-compacting concrete with two linings cast in place for tunnels. Background technique [0002] With the continuous development of underground engineering in my country, self-compacting concrete has been widely used in tunnel (hole) lining structures due to its good fluidity, stability, segregation resistance and uniformity, especially in water conveyance tunnels. The tunnel structure is supported by built-in formwork, and the self-compacting concrete is poured in one time to reduce the horizontal joints of the structure. The self-compacting concrete is transported from the ground to the ground first, then transported from the ground to the pouring work surface, and then pumped to the pouring port by the ground pump for warehousing. The choice of different siloing methods has a certain influence on the concrete pouring process and the effect of structural mold...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for pouring self-compacting concrete for the second lining of the tunnel. It is necessary to solve the problem that the existing concrete storage method requires a large pump pressure for bottom extrusion pouring, which is prone to "suffocation" due to insufficient pump pressure. The technical problem of “pump” is also the technical problem that the bottom concrete is not filled tightly, and there are technical problems of local retention and exposed reinforcement, and the technical problem of concrete segregation caused by large concrete drop is also needed.

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