One-time pouring concrete inverted arch and construction method thereof

Abstract

The invention discloses a one-time pouring concrete inverted arch and a construction method thereof. Inverted arch concrete from a position below an inverted arch filling face of an tunnel inverted arch to an inverted arch primary support is a concrete whole which is free of a concrete boundary and concrete layers and is poured at a time with a same mark number. During construction, an inverted arch arc-shaped formwork is cancelled, and only inverted arch side wall formworks, an inverted arch end formwork and a central ditch formwork are installed; and the inverted arch side wall formworks areinstalled at preset heights of side walls on two sides of the inverted arch, the lower ends of the inverted arch side wall formworks are flush with a preset inverted arch filling face, concrete is poured into an inverted arch middle pouring area at a time to reach a designed height of the inverted arch filling face, and inverted arch concrete is poured into the inverted arch side wall formworks on two sides of the inverted arch to reach the preset height. The construction process is greatly simplified, the construction time is remarkably shortened, layered pouring interface gaps are reduced,inverted arch uplift caused by crack water frost heaving is prevented, the inverted arch construction quality is effectively improved, the engineering cost is saved, and the application range in tunnel construction must be wider and wider.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a one-time pouring concrete invert and a construction method thereof. Background technique [0002] In the current tunnel construction, the inverted arch is a reverse arched structure set at the bottom of the tunnel to improve the stress conditions of the upper support structure of the tunnel. It is one of the main components of the tunnel structure. The pressure can effectively transmit the load on the road surface to the underground through the tunnel side wall structure or effectively resist the reaction force from the lower layer of the tunnel. The inverted arch and the secondary lining constitute the tunnel as a whole, increasing the structural stability. The secondary lining and filling of the inverted arch is currently poured in layers with arc-shaped formwork. The formwork system including the arc-shaped formwork is installed first, and then the secondary lin...

AI Technical Summary

Problems solved by technology

At present, the secondary lining and filling of the inverted arch is generally poured in layers with arc-shaped formwork. The formwork system including the arc-shaped formwork is installed first, and then the secondary lining of the inverted arch is poured. The interface is combined with defects; the construction process is cumbersome, and the transition time between processes is long, prolonging the construction period, seriously restricting the construction progress of the inverted arch, causing the step distance to exceed the standard, and seriously affecting the construction safety in the tunnel

This method is the current standardized construction procedure. Since the mechanical properties cannot be reduced proportionally and the mold test cannot be reduced, the resistance to change is high, and the design funds and manpower are huge. It has been difficult to make a breakthrough.

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