Inverted-installation construction method for large pressure steel pipe in high shaft

Abstract

The invention relates to an inverted-installation construction method for a large pressure steel pipe in a high shaft. The inverted-installation construction method comprises the following steps: arranging a temporary hoisting working platform at the top of an installation position of a large pressure steel pipe in a shaft, arranging a hoister on the temporary hoisting working platform, and utilizing the hoister to carry out top-down installation of the pressure steel pipe. With the adoption of the inverted-installation construction method for the large pressure steel pipe in the high shaft, the difficulties that the embedded shaft forward erection construction method cannot realize top-down hoisting from the top of the shaft or transporting of the large pressure steel pipe from the upstream side diversion tunnel are effectively solved, civil construction and expanding excavation are reduced or avoided, the contradiction between the installation of the large pressure steel pipe and the civil construction of the upstream side diversion tunnel is avoided, the engineering construction progress is accelerated, the construction period is shortened, the construction cost is reduced, the installation and construction cost is reduced, and special or large hoisting equipment is not needed.

Description

technical field [0001] The invention relates to the field of hydropower engineering construction, in particular to a method for inverting construction of large pressure steel pipes in high shafts. Background technique [0002] At present, the installation and construction of large-scale penstocks in high shafts of hydropower projects at home and abroad, due to the influence of construction technical conditions and traditional inertial thinking methods, generally adopt "top-down" for hoisting and "bottom-up" for assembly, welding, installation and construction Way (commonly known as: "formal dress method"). This construction method requires that the penstock must be transported from the diversion tunnel on the upstream side or the construction branch tunnel or other temporary roads to the top of the installation site of the penstock in the shaft, and then the penstock shall be placed in sequence using the lifting equipment pre-set on the top of the shaft. They are hoisted se...

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Problems solved by technology

[0004] However, this construction method also has obvious deficiencies and problems: firstly, due to reasons such as engineering technology and cost, the design of diversion tunnels in water conservancy and hydropower projects is mostly buried, and open shafts are rarely used. Engineering applications are often limited by the cross-section and traffic conditions of the diversion tunnel or construction branch tunnel on the upstream side of the shaft, which cannot meet the transportation of large penstocks in the tunnel, or must carry out necessary expansion or treatment, especially when the diversion tunnel is long or When the axis is arranged with steps or small-angle broken lines or the burial depth is large, the increased amount of tunnel expansion and concrete backfilling is very large, and it is often difficult to accept the project economically.

Secondly, in order to meet the hoisting and hoisting requirements of large penstocks in the shaft, special gantry hoisting equipment must be installed on the top of the shaft for open shafts, and the top of the shaft must be expanded and concrete rock anchor beams must be added for buried shafts. processing to meet the layout of large-scale penstock hoisting equipment in the vertical shaft and the demand for hoisting space, and additional engineering costs will be added

In addition, for buried shafts, when the construction period of the concrete lining construction of the civil diversion tunnel overlaps or intersects with the installation and construction period of the shaft penstock, the penstock transportation channel is often occupied by the civil construction, resulting in the failure of construction or forced shutdown of the penstock

Especially when the diversion tunnel is long and there is no special penstock for transporting branch tunnels or the construction period is tight, the contradiction between the penstock installation of the vertical shaft and the construction of the civil tunnel construction becomes more prominent, and sometimes it cannot be overcome and resolved, which seriously affects the project. overall construction progress

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