Automatic steam curing system for second lining concrete of single track tunnel and construction method

Abstract

The invention discloses an automatic steam curing system for second lining concrete of a single track tunnel. The system comprises an arch frame consistent with the orientation and arch of the tunneland used for being placed in the tunnel, a space is formed between the arch frame and the side wall of the tunnel, and a temperature preservation rubber plate is arranged on the annular surface of thearch frame; rubber curtain heads are arranged at the two ends of the arch frame, a cavity body with an opening formed in the upper portion is enclosed by the temperature preservation rubber plate andthe rubber curtain heads, and when the cavity body is placed in the tunnel, the cavity body and the two lining surface of the runnel form a closed space; a plurality of steam pipelines longitudinallyarranged are arranged on the arch frame and located in the cavity body at intervals, and a plurality of steam outlets are formed in the steam pipelines in the orientation directions of the steam pipelines at intervals and used for spraying steam towards the second lining surface of the tunnel in the closed space. The steam curing system controls the temperature and humidity of the environment inthe period of curing concrete, achieves intelligent curing operation, and defectively ensures curing of the second lining concrete.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an automatic steam curing system and construction method for the second-lined concrete of a single-line tunnel. Background technique [0002] Tunnel engineering is a typical large-volume concrete engineering. Due to the heat of cement hydration, after the concrete is poured, timely maintenance is required to effectively prevent the concrete from cracking due to solidification and shrinkage, so as to meet the requirements of concrete strength and durability. Concrete maintenance in the prior art usually adopts spraying curing method, but because the water temperature of spraying curing is not easy to control, the sprayed water temperature does not match the concrete temperature, which accelerates the damage to the quality of the secondary lining concrete, and spraying curing requires laying A large number of water pipes are not only easy to block the water ...

AI Technical Summary

Problems solved by technology

Concrete maintenance in the prior art usually adopts spraying curing method, but because the water temperature of spraying curing is not easy to control, the sprayed water temperature does not match the concrete temperature, which accelerates the damage to the quality of the secondary lining concrete, and spraying curing requires laying A large number of water pipes are not only easy to block the water pipes, but also cause serious waste of water resources. At the same time, the water scattered on the site has a great impact on the construction environment

At the same time, due to the low ambient temperature of tunnels in severe cold areas, the secondary lining concrete is prone to freezing and the temperature difference between the inside and outside of the concrete is too large. If a certain curing temperature cannot be guaranteed, it is easy to cause cracks in the secondary lining concrete and reduce the appearance quality of the lining surface.

[0003] In particular, the ambient humidity in the long single-track tunnel is extremely unstable, and the spray curing water temperature is quite different from the concrete in the tunnel, resulting in cracks on the surface of the secondary lining concrete, insufficient strength, and greatly affected durability.

Images