CN-122013722-A - Butyl dam rigid bottom protection structure suitable for strong surge environment

Abstract

The invention provides a block dam rigid bottom protection structure suitable for a strong surge condition, wherein a coated surface around an original block dam is filled with graded block stones, the upper parts of the graded block stones are regularly and densely arranged with hollow frame reinforced concrete regular tetrahedrons, so that a protection system is formed, the filling range of the graded block stones is 15-20 m respectively at the upstream and downstream of the dam body and 20 m around the dam head, the graded block stones are filled from a bed surface below-1.5 to-6.5 m, the thickness of the polished surface of the graded block stones is 1-2 m, and the hollow frame reinforced concrete regular tetrahedrons are filled with 1-2 layers. The invention has the advantages of reducing the flushing strength of the water flow, strengthening the stability of the beach surface around the spur dike, promoting the change of the water flow to be smoother and softer, and effectively reducing the flushing of the water flow to the coating surface.

Inventors

• CHEN YANPING
• YUAN WENXI
• SUN JIE
• WU ZHE
• LU BINQIANG

Assignees

• 浙江省水利水电勘测设计院有限责任公司

Dates

Publication Date

20260512

Application Date

20260206

Claims (5)

1. 1. A block dam rigid bottom protection structure suitable for a strong surge condition is characterized in that graded block stones are cast and filled on the peripheral coating surface of an original block dam, hollow frame reinforced concrete regular tetrahedrons are regularly and densely arranged on the upper portion of the graded block stones, so that a protection system is formed, the casting and filling range of the graded block stones is 15-20 m respectively on the upstream and downstream of a dam body and 20m around a dam head, the graded block stones are cast and filled from bed surfaces below-1.5 to-6.5 m, the thickness of the polished surface of the graded block stones is 1-2 m, and the hollow frame reinforced concrete regular tetrahedrons are cast and filled with 1-2 layers.
2. 2. The rigid bottom protection structure of the bunk dam, which is suitable for the strong surge condition, according to claim 1, is characterized in that the side length of the regular tetrahedron of the permeable frame reinforced concrete is 2.5-3 meters, the frame column adopts a circular arc triangular prism, and the thickness of the frame is 45-50 cm.
3. 3. The rigid bottom protection structure of the bunk dam suitable for the strong surge condition, which is disclosed by claim 1 or 2, is characterized in that four rows of matched block stones are respectively thrown and filled at the upstream and downstream of the dam body, 2 layers of permeable frame reinforced concrete regular tetrahedrons are regularly densely arranged at the upper part of the dam body, eight rows of matched block stones are thrown and filled at the periphery of the dam head, and 2 layers of permeable frame reinforced concrete regular tetrahedrons are regularly and densely arranged at the upper part of the dam body.
4. 4. The rigid bottom protection structure of the bunk dam suitable for the strong tidal bore environment, which is characterized in that the regular four sides of the regularly densely arranged permeable frame reinforced concrete at the dam body and the dam head weigh 4-5 tons.
5. 5. The rigid bottom protection structure of the bunk dam, which is suitable for the strong surge condition, is characterized in that 30-50 kg of lump stones are adopted as the proportion of 30-50 kg of lump stones, 50-100 kg of lump stones are adopted as the proportion of 30%, the saturated compressive strength of the bottom protection of the graded lump stone layer is not less than 40MPa, and the softening coefficient is not less than 0.75.

Description

Butyl dam rigid bottom protection structure suitable for strong surge environment Technical Field The invention relates to the technical field of bottom protection of a spur dike, in particular to a spur dike rigid bottom protection structure for protecting a vertical pile foundation or a spur dike structure in a river by covering and protecting a powder sand foundation and reducing the overcurrent flow rate under a strong tidal bore environment so as to prevent strong tidal bore and reciprocating flow from brushing the spur dike and the pile foundation. Background The coast institute of the Zhejiang province river mouth observes the tidal bore of the qiantang river along the coast for a plurality of times, and the propagation speed of the tidal bore of the river mouth can reach 4-6.5 m/s. The dam head of the spur dike mainly has 3 interactive water flow structures, namely, the concentrated flowing around and down-flowing of the dam head and the vertical axis vortex behind the dam head, and the combined effect of the three is a main power factor of the water damage of the spur dike caused by the local flushing of the dam head. In the Qian Tangjiang river, the flow around the head of the spur dike is more complicated under the influence of tidal current. In the practice of the dam impact protection engineering, various measures are taken to control the development of the local flushing pit of the dam head. The measures or the weakening of the water flow power near the butyl dam can be realized, such as reasonably setting the dam length, the dam height, the distance, the angle and the like of the butyl dam to smooth the water flow of the dam head as much as possible, or the impact resistance of the bed surface near the dam head can be improved, such as the dam head adopts a cushion layer such as stone throwing, special-shaped block throwing or concrete hinge row and the like to protect the bottom. Compared with a solid protection material (such as a solid concrete tetrahedron), the tetrahedron water permeable frame has the advantages that abrupt change interference of the solid material on water flow is changed into gradual change interference of the water permeable material along the path, the integral interference of the solid material on water flow is changed into local interference of each rod, and thus the change of water flow is promoted to be smoother and softer. Through comparative practice, the effect of the hollow tetrahedron is superior to that of the solid concrete tetrahedron in the aspects of speed reduction and impact prevention. In the current engineering application, the tetrahedron permeable frame is mostly prefabricated by reinforced concrete pole pieces with the length of 1.0m and the section size of 0.1m multiplied by 0.1m, and the frame structure is mostly used for the river bank scour protection along the Yangtze river, is also used in the Feiyun river, but is not implemented in the strong tidal bore and the large flow velocity area of the Qian pond river. Disclosure of Invention The invention aims to provide the rigid bottom protection structure of the bund dam, which is suitable for the strong surge environment, and can reduce the water flow flushing strength, strengthen the stability of the beach surface around the bund dam, promote the change of the water flow to be smoother and softer and effectively reduce the flushing of the water flow to the spreading surface. In order to achieve the above purpose, the present invention is realized by the following technical scheme: A rigid bottom protection structure of a block dam suitable for a strong tidal bore environment is characterized in that graded block stones are thrown and filled on the peripheral surface of an original block dam and used for protecting the bottom of a strong tidal bore river sandy soil foundation, meanwhile, tidal bore underflow is prevented from washing bottom sand, the upper part of the graded block stones are regularly densely arranged and prefabricated large-block-weight medium-large hollow frame reinforced concrete regular tetrahedrons are subjected to beach protection, so that a protection system is formed, water flow scouring energy is eliminated, water flow scouring strength is reduced, and beach surfaces around the block dam are more stable. The polishing and filling range of the graded block stones is 15-20 meters at the upstream and downstream of the dam body and 20 meters around the dam head, the graded block stones are polished and filled from a bed surface below-1.5 to-6.5 meters, and the polishing layer thickness of the graded block stones is 1-2 meters. And 1-2 layers of hollow frame reinforced concrete regular tetrahedrons are filled. Furthermore, the grading block stone layer bottom protection should be implemented when the flow speed of small tidal flood tidal bore is small, so that water flow scouring is prevented, and after the design thickness is reached, 1-2 layers of hollow frame reinforced