Pumped concrete construction technology under different working conditions

Construction Technology of Pumped Concrete under Different Working Conditions Wu Chongming Qinshan Nuclear Power Plant Phase II Nuclear islands and conventional islands The buildings from the base floor to the superstructure are all cast-in-situ reinforced concrete structures with complex structures and cast-in-place concrete works. Large volume and long cycle. Concrete pumping equipment was introduced during the construction, including 2 transfer pumps, 2 sets of distribution machines (32m 728m) and 1 set of 32m pump trucks.

1 Pumping Concrete Construction Points (1) According to the construction plan to determine the position of the cloth machine and pump truck, the cloth machine must be firmly installed, the concrete pump and the pump truck feet should be stable and firm; the concrete conveying pipe must be firmly set along the way, especially the pipe turning. Department. After the pouring pipelines, concrete pumps, and distributors are installed in place, the acceptance is in compliance with the requirements, and the equipment and equipment inspections are operating normally.

(3) The first concrete mixer truck first fills the pump hopper with 0.5~1m3 cement mortar to lubricate the concrete conveying pipe, then the second mixing truck transports the concrete to pour into the concrete pump and starts the concrete pump to push the cement. Mortar lubrication pipes.

(4) Disposal rod discharge tube A waste bin is used to recover cement mortar. After all the cement mortar is recovered, the pump is stopped when the concrete is seen in the garbage bucket. Wu Chongming, Daxian County, Sichuan Province, China's nuclear industry construction on the 24th The company, deputy chief engineer, senior engineer at the researcher level, 065201 Beijing Dongyanjia 203 letter box condensing soil is slightly lower than 96.3MPa, the remaining mix ratio exceeds 110MPa, the highest can reach 128MPa. SF and O*RHA reinforce the concrete, It is mainly related to its ultra-high pozzolanic activity (less water reduction effect) and the reinforcing effect of 2m slag powder on concrete is related to its strong mineral water-reducing effect and is also related to its higher latent hydraulic properties.

Remove cement mortar.

(9) After the concrete is poured, clean the site work surface, construction joints, reinforcing steel and equipment.

2 The concrete pumping foundation pits under different working conditions for large-scale concrete pumping nuclear islands and conventional island foundation slabs are all large-volume reinforced concrete, located more than 10 meters underground, with dimensions of 165mX96mX (1.50 blocks per The amount of concrete is about 5ro~36(1)m3.) The mineral admixture consisting of a slag fine powder with a particle size of 2m and a highly active pyrotechnic material such as O-RHA, SF etc. There is a certain degree of water reduction and high reactivity.

With the use of fabrics, all the other methods of using end hoses, the main difficulty is the piping layout and fixing methods.

2.1.1 Pipe layout in front of the work () Concrete pump installation site is higher than the work surface. The pipeline is arranged as a straight section - a ramp section - a straight section of the work surface. Use appropriate bends on both sides of the ramp to better connect with the straight section and fix the pipe with concrete blocks to reduce the horizontal thrust of the concrete in the pipe. Before entering the job, the concrete conveying pipe must be rigidly fixed.

The inclination angle of the downwardly inclined pipeline for pouring concrete to the foundation pit shall not be greater than 7* The horizontal pipeline with a height difference of 5 times shall be connected at the end of the downward inclined pipeline. If the length of the horizontal pipe cannot meet the above requirements due to the topography, an elbow may be added to increase the down resistance of the concrete. When the slope of the downslope pipe is greater than 7*, a deflating valve should be installed on the pipe end of the inclined pipe. In order to exclude the air in the inclined pipe, the grout is spread over the entire pipe wall. 2.1.2 Pipes arranged behind the working surface The racks with 500 mm arrangement are used as the pipe supports for the working surface. A rolling lever can be set on the upper part of the frame to reduce the movement of the reinforcing bars caused by the horizontal thrust of the concrete conveying pipe.

Wood planks to reduce the stress concentration in the pipe support.

Both ends are fixed with two concrete blocks. Work surface

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