A surge chamber structure and construction method suitable for long-distance pressurized water diversion tunnels

Abstract

The invention discloses a surge chamber structure applicable to a long-distance pressure diversion tunnel and a construction method. The surge chamber structure comprises the pressure diversion tunnel located on the lower portion. Two or more layers of cylindrical surge chambers are arranged on the pressure diversion tunnel. All the surge chambers become larger gradually from bottom to top in a step widening mode. A resistance hole is formed in the center of a bottom plate of each layer of surge chamber. The resistance hole of the surge chamber on the undermost layer is communicated with the pressure diversion tunnel. A top cover is arranged at the top of the surge chamber on the uppermost layer. An exhaust hole is formed in the top cover or the surge chamber on the uppermost layer. In this way, the multistage surge chambers are adopted for adjusting the pressure jointly, the impacting force of a water hammer is relieved through the resistance holes of the surge chambers on all layers, and the pressure of the water hammer is borne by the side walls and the bottom plates of the surge chambers and discomposed onto surrounding rock and a concrete lining structure, so that the water pressure is relived step by step, and the purposes of decreasing structural sections of the surge chambers and reducing project investment are achieved.

Description

technical field [0001] The invention relates to a pressure regulating structure of a water diversion tunnel, in particular to a structure and a construction method of a pressure regulating chamber suitable for a long-distance pressurized water diversion tunnel, belonging to the technical field of water conservancy and hydropower engineering. Background technique [0002] In the water conservancy and hydropower projects developed by water diversion, due to the long pressurized water diversion line, when load shedding or sudden load increase occurs, the water hammer phenomenon often occurs due to the superimposition of water transmission waves, causing water hammer damage to the water diversion structure. To solve this kind of problem, one or more surge wells are usually installed in the middle or at the back of the water diversion line. The usual construction method of this type of surge well is to excavate a cylindrical structure with a large cross-section from the top of the...

AI Technical Summary

Problems solved by technology

[0002] In water conservancy and hydropower projects developed by water diversion, due to the long pressurized water diversion line, when load shedding or sudden load increase occurs, water hammer phenomenon often occurs due to the superimposition of water transmission waves, causing water hammer damage to the water diversion structure

To solve this kind of problem, one or more surge wells are usually installed in the middle or at the back of the water diversion line. The usual construction method of this type of surge well is to excavate a cylindrical structure with a large cross-section from the top of the mountain, and form it with the diversion tunnel. China Unicom relies on the capacity of the cylindrical structure to adjust the water hammer pressure, so that part of the water flow caused by the water hammer overflows through the surface. However, this type of cylindrical structure surge well often requires a large section and a large structural height, resulting in huge project investment.

Especially in some deep-buried long-distance water transmission lines, due to the strong mountains and deep buried depths (some tunnels can be buried as deep as about 1000m), the excavation volume of conventional surge shaft structures is huge, and the construction cost is very high. high

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