A protective structure for a high-speed flow surface and its construction method

Abstract

The invention discloses a protection structure of a high-speed overflowing surface and a construction method thereof. The structure comprises granites on a protection surface layer, secondary concrete on a middle transition layer and primary concrete on a base layer, wherein primary structural concrete reinforcements are arranged on the top surface of the primary concrete; secondary concrete surface layer reinforcements are arranged on the top surface of the secondary concrete; the primary concrete and the secondary concrete are connected through U-shaped ribs; the secondary concrete and the granites are connected through elbow anchor ribs or straight anchor ribs; and multiple granites are arranged in sequence to form an array, and are filled with gap concrete to be fixedly connected. The structure is novel in design idea, safe, reliable and convenient to operate, and greatly improves the scour resistance and the wear resistance of spillways. The structure is suitable for medium-high dam spillway engineering under bad river bed geological conditions.

Description

technical field [0001] The invention relates to the technical field of design and construction for the protection of a high-speed flow surface of a dam spillway, in particular to a protection structure for a high-speed flow surface and a construction method thereof. Background technique [0002] With the development of hydropower technology in Pakistan, more and more medium-high dams have appeared in dam construction. When the dam lifts the floodgate at high water level, the scour and wear of the surface of the spillway caused by high-speed water flow has always been a key consideration for the anti-scour and wear resistance of the spillway. At present, the spillway generally adopts high-strength concrete or steel plate structure protection. However, in some rivers, the rock mass on both sides of the riverbed upstream of the power station is broken. At an exceptionally high water level, once the spillway gate is lifted, high-speed water mixed with rocks will pour into the s...

AI Technical Summary

Problems solved by technology

At present, the spillway generally adopts high-strength concrete or steel plate structure protection. However, in some rivers, the rock mass on both sides of the riverbed upstream of the power station is broken. At an exceptionally high water level, once the spillway gate is lifted, high-speed water mixed with rocks will pour into the spillway and the stilling basin, causing the concrete on the surface of the spillway to be easily damaged by the rocks. Under the long-term erosion of the water flow, a large area of ​​permanent permanent damage, which seriously affects the service life of the permanent buildings and the safety of the project

[0003] In the spillway design of hydropower stations, high-strength concrete is generally used as the anti-scouring and wear-resistant material for the high-speed flow surface. Sand and rocks are easily washed away by high-speed water flow when the dam is lifted, and the rocks are accompanied by high-speed water flow and cause direct damage to the spillway floor

When a hydropower station is built in a river with well-developed rock fissures, the damage to the high-speed flow surface caused by the impact of rocks on the spillway of the power station is more obvious. It is difficult for high-strength concrete to achieve the characteristics of anti-scouring and wear resistance and ensuring the safety of the spillway in such a harsh water flow environment. Require

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