Clay tunnel steel lining concrete pouring anti-floating structure and construction method

Abstract

The invention provides a clay tunnel steel lining concrete pouring anti-floating structure and a construction method. A steel lining is arranged in a clay tunnel; two semi-annular steel arch supports are arranged on the inner wall of the tunnel and connected at the waist of the tunnel through a splicing plate structure; the steel arch supports are arranged in a concrete layer on the inner wall of the tunnel; a concrete bottom plate is arranged at the bottom of the tunnel; I-shaped steel is arranged in the concrete bottom plate; a nail plate is arranged at the top arch position of the tunnel; the splicing plate structure, the I-shaped steel and the nail plate are connected with a stiffening ring of the steel lining; and a telescopic combined supporting structure is arranged in the steel lining. Various construction defects caused by layered pouring and common steel lining inner supports are overcome, concrete pouring buoyancy can be effectively resisted, continuous pouring of backfill concrete is achieved, and damage to the inner surface of the steel lining and secondary painting of anti-corrosion materials during inner support installation are avoided.

Description

technical field [0001] The invention relates to the tunnel construction field of water conservancy and hydropower projects, in particular to a clay tunnel steel-lined concrete pouring anti-floating structure and a construction method. Background technique [0002] Hydraulic tunnels in water conservancy and hydropower projects are generally reinforced concrete or steel-lined concrete structures, and steel-lined concrete structures are mainly used in situations where the water diversion pressure is high or the requirements for tunnel leakage are relatively strict. When the crack control standard of the concrete structure is relatively strict, the steel-lined concrete structure will also be used when the steel reinforcement ratio is too large due to the use of the reinforced concrete structure, and the construction is difficult. For steel-lined concrete structures, the steel lining is generally installed in the tunnel after excavation, and then the space between the steel linin...

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Problems solved by technology

Since the inner surface of the steel pipe has been painted with anti-corrosion materials before the installation of the inner support, on the one hand, this direct welding method will damage the anti-corrosion coating and the base material of the steel lining. The surface is re-polished and painted with anti-corrosion materials. The procedure is complicated and affects the construction quality of the steel lining.

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