Improved method for construction of reserved slot at downstream dam surface for cooling pipe installation

Abstract

An improved method for construction of a reserved slot at the downstream dam surface for cooling pipe installation comprises the steps that 1, after a template (5) below a pouring bin position is installed, geotechnical cloth (2) is tied to the exposed end of a cooling pipe (1) and is then smeared with concrete separating materials, and the exposed end of the cooling pipe (1) is made to be attached to the template (5); 2, the lower template (5) is detached, then the geotechnical cloth (2) at the exposed end of the cooling pipe (1) is detached, and concrete near the end is removed to enable the end to be exposed by a length enough for welding a sleeve (3); 3, the sleeve (3) is welded to the exposed end of the cooling pipe (1) to enable the cooling pipe (1) to be communicated with an external pipe (4), normal water supply is ensured, construction cost is reduced, working efficiency is improved, and construction quality is guaranteed.

Description

technical field [0001] The invention relates to a construction method of a temperature control auxiliary device of a hydropower project, in particular to a construction method of an improved reserved groove behind a cooling water pipe dam. Background technique [0002] In the construction process of the mass concrete structure poured as a whole, in order to avoid excessive temperature stress, prevent the generation of temperature cracks or control the cracks within a certain limit, temperature control must be carried out. At present, in the artificial temperature control measures of mass concrete, water pipe cooling is more commonly used, which is widely used at home and abroad because of its great adaptability and flexibility. It is the most commonly used artificial temperature control method for mass concrete. cooling method. The cooling water pipes in the dam are introduced into the reserved groove behind the dam on the downstream dam surface according to the zoning rang...

AI Technical Summary

Problems solved by technology

And it takes a lot of labor and metal supports in the process of installation and fixing

[0005] (2) Embedding pre-embedded wooden boxes is easy to form a vibrating blind area, which affects the quality of concrete pouring

The pre-buried parts are densely packed with steel bars and the supporting components are complex, resulting in a narrow space for vibration. It is often necessary to use a Φ50mm hose vibrator to strengthen the manual vibration of this part

[0006] (3) The second phase concrete backfilling of the reserved groove is labor-intensive and time-consuming, and it is easy to cause joint surface contact problems

[0007] In addition, the second-stage concrete backfilling of the reserved groove of the cooling water pipe needs to be carried out on the trestle behind the dam, which belongs to high-altitude operations

Affected by the limit of the cable machine, a large amount of backfill materials need to be manually transported to the backfill area through the plank road, and long-term operations on it are prone to safety hazards

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