A construction control method for preventing cold joints in mass concrete pouring
A large-volume concrete and control method technology, applied in construction, infrastructure engineering, etc., can solve problems such as prone to missed judgments and difficult to be comprehensive, and achieve the effect of ensuring construction quality and avoiding subjectivity
Active Publication Date: 2021-04-09
CHINA RENEWABLE ENERGY ENG INST
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Problems solved by technology
[0003] In the past, the prevention of concrete cold joints could only rely on the on-site management personnel to stand by and judge the initial setting state of the concrete through observation. Judgment accuracy also varies from person to person
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[0056] During the pouring process of the 38 warehouse of No. 7 dam section in the concrete pouring of a project dam, the concrete layer thickness of the pouring warehouse is 3m, and the pouring volume is 5216.9m 3 , according to the construction plan provided by the design system, the concrete is constructed according to 6 blank layers, and the thickness of each blank layer is 0.5m. The concrete in this warehouse is all entered by cable crane, the initial setting time of concrete is 4 hours, and the pouring strength of each cable crane is 63m 3 / h, considering the operation interference of the cable machine and other factors, the loss coefficient k=0.72, then according to the cable machine configuration formula, the number of cable machines should be configured n=5216.9 / (63*6*4*0.72)=4.79≈5, then the The warehouse surface is divided into 5 strips equally spaced from the upstream to the downstream for pouring, and the concrete entering the warehouse for each strip is responsibl...
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The present invention provides a construction control method for preventing cold joints in large-volume concrete pouring, including: 1) before concrete pouring, designing the pouring silo surface, determining the number of silo surface construction strips and pouring cables and the pouring sequence; 2) In the process of concrete pouring, each discharge action of concrete is numbered in the dam silo. At the same time, monitoring equipment is used to monitor and record the construction data of concrete corresponding to each number in real time, and transmission equipment is used to transmit the construction data in real time through the site network. transfer to the backend server, etc. By recording and analyzing the concrete transportation process, unloading position and unloading time, the invention obtains the information of the initial setting state of the concrete, assists the on-site management and control personnel to control the quality of the concrete construction, avoids the generation of cold joints during the concrete pouring process, and is suitable for large-scale concrete construction. Quality control in volume concrete engineering construction.
Description
technical field [0001] The invention relates to a construction control method for preventing cold joints in concrete pouring, belonging to the field of concrete pouring quality control. Background technique [0002] The construction of water conservancy and hydropower projects involves a large amount of concrete pouring construction, and its construction quality directly affects the quality, progress and cost of project construction. The cold joint of concrete is a kind of structural surface formed in the concrete structure when the concrete pouring is interrupted due to unexpected factors during the concrete pouring process. The covering interval of the upper layer of concrete exceeds the initial setting time of the concrete. The generation of cold joints will lead to loose bonding between concrete layers and form leakage channels, which will leave hidden dangers to engineering structures and anti-seepage safety in the later stage. When cold joints appear during the pourin...
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IPC IPC(8): E02D15/02
CPCE02D15/02E02D2250/0023
Inventor 胡超陈媛媛
Owner CHINA RENEWABLE ENERGY ENG INST