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Large-volume concrete fast pouring and temperature control method

A large-volume concrete and concrete technology, which is applied in the direction of construction, building structure, and building material processing, can solve the problems of insufficient depth, large spacing, and insufficient optimization of other factors of the cooling effect, so as to save construction costs and achieve good results. Temperature control effect, effect of reducing pouring temperature

Inactive Publication Date: 2011-03-30
HOHAI UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Limited to the accuracy of the previous water pipe cooling algorithm, previous research results and patents are not enough to understand the effect of water pipe cooling. The maximum pouring layer thickness commonly used in actual engineering is 3.0m, and the water pipes in the concrete pouring block are often arranged at a large distance. Generally, it is 2.5m ~ 3.0m, except for the spacing, other factors that affect the cooling effect are not fully optimized

Method used

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Examples

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Effect test

Embodiment 1

[0018] Example 1:In a concrete dam project in Guangdong Province, multiple pouring blocks were used with a pouring layer thickness of 6m. Under the local high temperature conditions, the restrictions on pouring temperature were relaxed. The specific implementation methods during construction are as follows: (1) Water pipe cooling: During the pouring process, lay PVC pipes with an inner diameter of 28mm, and the layout of water pipes adopts vertical distance×horizontal distance=1.50×1.00m. The water pipes in the dam body layer (below the elevation of 243.0m) are arranged in the direction of the left and right banks, and the normal concrete above the water flow channel (above the elevation of 243.0m) is arranged in the direction of the upstream and downstream. When laying out the water pipes, it is necessary to ensure that the water pipes are 0.5m to 0.8m away from the surface of the dam body. The cooling water temperature is 22.0°C, the water flow rate is 25L / min, and the wate...

Embodiment 2

[0019] Example 2: In a certain concrete dam project in Sichuan, the 13# riverbed dam section located in the strongly constrained area of ​​the foundation is 152m long and 20m wide, and the method is used to pour 6m layer thickness. The rapid pouring temperature control method used in the construction is as follows: (1) Water pipe cooling: use HDPE pipe with a diameter of 2.8cm, the vertical spacing of the water pipes x the horizontal spacing of 1.5m x 1.5m, and the distance between the uppermost water pipe and the warehouse surface is 0.6m. The horizontal distance between the water pipe and the upstream and downstream surfaces is 0.5-1.0m. The inlet water temperature is 10°C, and the water is passed through for 28 days. The initial water velocity is 1.2m / s. After passing through the water for 14 days, the flow velocity is reduced to 0.6m / s. Change the water flow direction every other day. (2) Surface insulation: cover the concrete silo surface with a 2.0cm thick dam insul...

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Abstract

The invention discloses a large-volume concrete fast pouring and temperature control method which comprises the steps of (1) water pipe cooling and (2) surface thermal insulation. The method can lead the thickness of a pouring layer to break through 3m and lead the pouring interim period to be less than 5 days through the method of changing the material of a water pipe, the diameter of the water pipe, the thickness of the pipe wall, the spacing interval of the water pipe, the position of the water pipe, the length of the water pipe, water temperature at an inlet, flow rate of cooling water, water supply time and water flow direction during the water pipe cooling measure, and the corresponding surface thermal insulation method for assistance, thereby realizing fast pouring of large-volume concrete and simultaneously effectively preventing cracks. The method can be used for the large-volume concrete fast construction in civil and hydraulic engineering.

Description

technical field [0001] The invention relates to a rapid pouring and temperature control method for large-volume concrete, and belongs to the technical field of concrete pouring and temperature control methods. Background technique [0002] At present, cracks often appear after mass concrete construction, such as dams, anchorages, bridge piers, etc., and temperature load is an important reason for mass concrete cracking. Therefore, in such projects, the temperature control of concrete during construction is an important part of design and construction. A very important item. At present, the commonly used temperature control methods can be summarized into four aspects: control of pouring temperature, water pipe cooling, warehouse surface heat dissipation and surface insulation. The comprehensive use of these measures has an obvious effect on preventing cracks from appearing, but cracks in mass concrete still often appear, which affects the normal construction progress and saf...

Claims

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Application Information

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IPC IPC(8): E04G21/02
Inventor 朱岳明强晟王润英陈守开海燕郭利霞朱振泱颉志强刘敏芝王海波张杨许军才
Owner HOHAI UNIV
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