Half-and-half precast gallery structure and gallery construction method

Abstract

The invention discloses a half-and-half precast gallery structure and a gallery construction method. The half-and-half precast gallery structure is formed by assembling symmetrical split bodies in pair, wherein each symmetrical split body comprises a straight wall section and a top arch section which are integrally connected, two layers of reinforcing meshes are distributed on the extending surface of the straight wall section and the extending surface of the top arch section, each reinforcing mesh consists of longitudinal reinforcing steel bars and transverse steel wires which spread in a mutually perpendicular mode, and four lifting holes are formed in the symmetrical split body. The gallery construction method comprises the following steps of: manufacturing and mounting a gallery precast block and reinforcing steel bars, processing and mounting a template, manufacturing and vibrating concrete, de-moulding concrete, and curing concrete. The gallery construction method can effectivelysolve equipment hoisting and mounting difficulty brought by a dam gallery full precast method, achieves the expected effects of being quick in construction and saving cost, has the advantages of being convenient in construction, quick in hoisting, short in construction period, good in integral stability, high in safety and the like, can realize lightweight, standard and standardized construction,and further can be not limited by a precast site and hoisting equipment tonnage.

Description

Technical field [0001] The invention belongs to the field of water conservancy and hydropower engineering, and in particular relates to a half-and-half prefabricated corridor structure and a corridor construction method for dams. Background technique [0002] In the field of hydraulic concrete gravity dam construction, concrete dams are often designed with internal corridors. In the construction method of corridors, there are nothing more than three forms, namely, full cast-in-place method, full-precast method and combination of cast-in-place precast law. [0003] The disadvantage of the cast-in-place method is that it affects the process of pouring and continuous ascent of the dam. The cast-in-place method requires two constructions. The first involves the erection of the side wall formwork on site and the binding of side wall reinforcement, and then the side wall is poured. For the surrounding concrete, erect the top arch formwork and tie the top arch reinforcement for the secon...

AI Technical Summary

Problems solved by technology

[0003] The disadvantage of the all-cast-in-place method is that it affects the process of pouring and continuous rising of the dam. The cast-in-place method needs to be constructed twice. The first time involves erecting the side wall formwork on site and binding the side wall reinforcement, and then pouring the side wall For the surrounding concrete, the top arch formwork and the top arch steel bars are installed for the second time, and then the concrete is poured; and the corridor runs through the left and right bank abutments, and the dam surface is divided into upstream and downstream parts. If it is a roller compacted concrete dam, the warehouse The internal construction machinery and equipment are impassable, and the construction period is long, which affects the continuity of the dam construction

[0004] The combination method of cast-in-place and prefabrication is generally cast-in-place for the prefabricated side walls of the roof arch. Although this method reduces the process of the existing roof arch formwork and binding steel bars in the warehouse, and shortens the intermittent time, the number of warehouse divisions has not been reduced. two construction

[0005] The full prefabrication method is generally the overall prefabrication of the side wall and top arch. This method shortens the shutdown time of the dam surface, reduces the process of erecting the formwork and binding the steel bars, improves the construction efficiency, and creates conditions for the rapid rising of the dam. However, if the corridor structure is large in size and heavy in shape, it will bring difficulties to prefabrication, transfer, hoisting and installation, requiring the use of large-tonnage mechanical equipment for hoisting, and more labor and machinery will be invested. Corresponding increase, but also increase the construction cost

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