Non-pressure tunnel planar steering flow joint building

Abstract

The invention relates to hydraulic and hydroelectric engineering, in particular to a non-pressure tunnel planar steering flow joint building. The non-pressure tunnel planar steering flow joint building is arranged at the steering section of a tunnel spillway. The joint building comprises an upstream straight flow section, a stilling pool, a pressure section and a downstream straight flow section. The upstream straight flow section is arranged at a steering section upstream inlet, and the downstream straight flow section is arranged at a steering section downstream outlet. A water inlet of the stilling pool is connected with a water outlet of the upstream straight flow section. A water outlet of the pressure section is connected with the downstream straight flow section. A water inlet of the pressure section is connected with a water outlet of the stilling pool. The included angle alpha between the pressure section and the stilling pool is an obtuse angle. A water outlet of the stilling pool is formed in the lower portion of the tail end of the stilling pool. An original non-pressure tunnel planar steering structure is adjusted to a two-straight-hole plane crossing mode, meanwhile, the downstream straight flow section is connected with the tail end of the stilling pool through the pressure section, the free face is basically parallel to a bottom slab after water in the stilling pool passes through the pressure section, and accordingly the problem that as a conventional non-pressure tunnel achieves planar steering through bends, the height difference between the inner side and the outer side is large is effectively solved.

Description

technical field [0001] The invention relates to a water conservancy and hydropower project, in particular to a non-pressure tunnel, which is convenient for construction and has a stable water flow plane after a bend, and is connected to a building when the plane turns to the water flow. Background technique [0002] In water conservancy and hydropower projects, non-pressure tunnels are often used as a drainage structure. Generally, for high-velocity unpressurized tunnels, they should be arranged as a straight line on the plane, but due to the limitation of the actual engineering terrain, the usual unpressurized flood discharge tunnels need to realize the turning of the tunnel axis through an arc with a certain turning radius on the plane. . As for the turning section, on the one hand, it is more difficult for the construction to set up the curve because of the plane turning; Downstream propagation causes large fluctuations in the water surface in the downstream straight se...

AI Technical Summary

Problems solved by technology

[0004] What the present invention aims to solve is the problem of high construction difficulty and high risk factor in the turning section of the existing non-pressure tunnel. It provides a non-pressure tunnel that is convenient for construction and has a stable water flow plane after turning the bend.

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