Fixing structure of water inlet pressure steel pipe of hydropower station

Abstract

The invention discloses a fixing structure of a water inlet pressure steel pipe of a hydropower station. The fixing structure comprises a pressure steel pipe, a steel branch pipe connected with the pressure steel pipe, an elbow connected with the steel branch pipe, and a station concrete wall body embedded at the top end of the elbow; a sliding support for limiting the vertical displacement is arranged at the bottom of a straight pipe section of the pressure steel pipe; a protection layer for level burdening and filling is arranged around the steel branch pipe and the elbow; a weight cover layer is arranged around the protection layer; and ribbing rings are arranged around the top end of the elbow which is embedded in the station concrete wall body. According to the fixing structure provided by the invention, no anchor block is arranged in a branch pipe and an elbow structure and the fixing structure is embedded in a soil body, so that the station is directly entered, and the stability of the steel branch pipe and the elbow can be maintained through the surrounding soil body, the wall body of the station, and the structure of the steel pipe. The fixing structure provided by the invention is simple in installation and construction processes; the construction difficulty of the steel branch pipe can be reduced; the work period can be reduced; the engineering amount of materials, such as concrete and steel bars, can be saved; and the engineering manufacturing cost can be reduced; and the great economical benefits and the great social benefits can be brought to the engineering.

Description

technical field [0001] The invention relates to a fixed structure for water inlet pressure steel pipes in a powerhouse of a hydropower station, in particular to a structural type in which steel bifurcated pipes and bent pipes without piers in a high water head hydropower station do not have a pier before entering the powerhouse. Background technique [0002] The steel bifurcation pipe or elbow pipe before the penstock of the high water head hydropower station enters the powerhouse generally needs to be equipped with concrete pier to resist the unbalanced water thrust and keep the steel pipe stable. [0003] The concrete township of steel bifurcation pipes or curved pipes is very complicated in structural stress, which has always been a technical problem that plagues the structural design of steel bifurcation pipes in high water head hydropower stations. The structural analysis of steel bifurcation pipe town pier concrete needs to establish a three-dimensional mathematical mo...

AI Technical Summary

Problems solved by technology

Engineering experience shows that after the project is put into operation, the concrete structure of the pier is easy to crack, which affects the service life of the pier

[0004] During the construction of the steel bifurcation pipe town pier concrete of the high water head hydropower station, in order to reduce the steel bars of the outsourcing concrete, it is necessary to take pressure-preserving measures and sometimes insulation measures, which cause difficulties in the installation of steel bifurcation pipes and concrete pouring construction, and even affect the project duration

[0005] In order to allow the steel pipe to freely deform along the axis of the pipe, expansion joints are generally installed between the townships or on the downstream side of the townships to offset the influence of temperature. The structure of the expansion joints is expensive and difficult to manufacture and install.

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