Suspended formwork lining method for cover arch outside tunnel portal with weak surrounding rocks

Abstract

The invention discloses a suspended formwork lining method for a cover arch outside a tunnel portal with weak surrounding rocks. The method comprises the following steps of mounting a first cover arch grid steel frame and a small advanced pipe shed to form a tunnel locking port; mounting second and third groups of cover arch grid steel frames to form an integral steel frame; arranging longitudinal steel pipes, laying bamboo plywood, and connecting the longitudinal steel pipes and the integral steel frame to form a formwork support system by using iron wires; pouring concrete to finish the construction of a reinforced concrete cover arch, and the like. According to the method, a framework is arranged in reinforced concrete to serve as a support system for a concrete formwork, and a suspended formwork construction technology is adopted for pouring the concrete, so that support to the front slope of the tunnel portal with the weak surrounding rocks is formed within an extremely short time, the displacement and the glide of the open channel front slope and the open channel side slope of the portal are effectively prevented, the large-area collapse of an open channel mountain body is prevented, and the safety holing of a tunnel is ensured; and the method is applied to temporary projects under the emergency conditions of lack of external support components for concrete-poured formworks, irregular poured concrete structures, high requirements on construction time and high speed.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a kind of construction where the surrounding rock at the entrance of the tunnel is particularly weak, and arches need to be used to urgently support the slope of the entrance, and it is difficult to form an external support formwork system in a very short time. Formwork lining method for internal self-supporting systems. Background technique [0002] Tunnel concrete pouring lining, also known as molded concrete lining, generally adopts integral steel mold lining trolley; combined steel mold with steel arch frame, bent frame, mobile work trolley; wooden formwork with wooden arch frame, wood Bent frame, artificial scaffolding; wooden formwork with steel arch, steel bent frame, artificial scaffolding, etc. [0003] The above formwork support methods are all through the external support system to ensure the positioning and stability of the formwork. The char...

AI Technical Summary

Problems solved by technology

[0004] When the lining trolley or the arch and bent frame are under special circumstances and are hit by heavy rain, the facing slope and side slope of the open channel at the tunnel entrance have been displaced and slipped. If emergency measures are not taken, a large area of ​​the open channel mountain will collapse. , it is difficult to guarantee the safe entry of the tunnel

There must be a time process for the processing and production of the special-shaped section formwork support system by the traditional method. When the formwork support system is completed, the accident must have occurred.

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