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Method for preventing concrete of spillway tunnel of hydropower station from cracking

A technology for concrete and flood discharge tunnels, applied in water conservancy projects, marine engineering, coastline protection, etc., can solve problems such as shortening engineering life, increasing water pressure outside the floor, and scouring in the tunnel, so as to control construction quality and reduce foundation constraints. , good preventive effect

Inactive Publication Date: 2016-03-16
中国安能集团第一工程局有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cracks in hydraulic concrete affect the appearance of the project. For high-velocity water flow areas, the high-speed water flow will form negative pressure in the penetrating cracks, thereby increasing the external water pressure on the bottom plate and other parts. Under the action of high-speed water flow cavitation, it will cause Concrete cracks develop and increase, and in severe cases, the bottom plate will be lifted, causing serious erosion in the hole, affecting the safe operation and function of the project, shortening the life of the project, and even causing safety accidents in the project

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] The concrete anti-cracking method of the flood discharge tunnel of the hydropower station according to the present invention, its construction steps are:

[0019] (1) The concrete of the unpressured section of the flood discharge tunnel is divided into blocks according to the length of 15m, and the part of the aerated sill where the structure changes is divided into blocks according to the length of 18m. The pouring height of the first and second floors of the side walls is 4.5m, the third and fourth floors are poured at a height of 3m to 1m below the arch line, and the top arch is used as the first floor construction. Seam penetration and copper water stop treatment;

[0020] (2) The concrete is proportioned according to the standard ratio of cement, sand aggregate, admixture, admixture and mixing water, and the alkali activity test of the concrete aggregate is carried out in due course;

[0021] (3) When carrying out the concrete mix construction of the anti-impact a...

Embodiment 2

[0029] The concrete anti-cracking method of the flood discharge tunnel of the hydropower station according to the present invention, its construction steps are:

[0030] (1) The concrete of the unpressured section of the flood discharge tunnel is divided into blocks according to the length of 15m, and the part of the aerated sill where the structure changes is divided into blocks according to the length of 18m. The pouring height of the first and second floors of the side walls is 4.5m, the third and fourth floors are poured at a height of 3m to 1m below the arch line, and the top arch is used as the first floor construction. Seam penetration and copper water stop treatment;

[0031] (2) The concrete is proportioned according to the standard ratio of cement, sand aggregate, admixture, admixture and mixing water, and the alkali activity test of the concrete aggregate is carried out in due course;

[0032] (3) When carrying out the concrete mix construction of the anti-impact a...

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Abstract

The invention discloses a method for preventing concrete of a spillway tunnel of a hydropower station from cracking and a concrete modification method and particularly relates to a method for modifying the concrete in the spillway tunnel of the hydropower station. According to the method for preventing concrete of the spillway tunnel of the hydropower station from cracking, after the scouring-resistant and abrasion-resistant concrete of the spillway tunnel is poured, no crack is found, and chemical grouting and polymer chemical material sealing treatment are conducted on construction joints and structural joints prearranged in the concrete construction process; detection is conducted in the tunnel after water is introduced into the tunnel for six months, no crack exists on the concrete in the tunnel, and the construction joints and the structural joints prearranged in the construction process are not changed obviously after being scoured. According to the method, through full-responsibility layering and blocking and prearranging of the construction joints, foundational restraints are effectively reduced, and the concrete construction quality is strictly controlled; a comprehensive temperature control measure is taken, so that cracks, which are not arranged in advance, of the concrete are effectively avoided, chemical grouting and polymer chemical material sealing treatment are conducted on the prearranged regular joints, and thus concrete treatment can meet the design requirement.

Description

technical field [0001] The invention relates to a concrete modification method, in particular to a concrete modification method in a flood discharge tunnel of a power station. Background technique [0002] Cracks in hydraulic concrete affect the appearance of the project. For high-velocity water flow areas, the high-speed water flow will form negative pressure in the penetrating cracks, thereby increasing the external water pressure on the bottom plate and other parts. Under the action of high-speed water flow cavitation, it will cause Concrete cracks develop and increase, and in severe cases, the bottom plate will be lifted, causing serious erosion in the hole, affecting the safe operation and function of the project, shortening the life of the project, and even leading to safety accidents in the project. Contents of the invention [0003] The purpose of the present invention is to overcome the defects of the prior art, and provide a concrete crack prevention method for t...

Claims

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Application Information

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IPC IPC(8): E02B8/06E02D15/02E02B3/16
CPCE02B8/06E02B3/16E02D15/02
Inventor 张礼宁郭朝辉马力杨鸿章张杰王寒春曾烦深李家海宁占金
Owner 中国安能集团第一工程局有限公司