Process and device for rotating and extending pile and slurry feed device

Abstract

The invention provides a process and device for a rotating and extending pile and a slurry feed device. The process includes that a brand new mechanism for reinforcing the side and the bottom of a pile is provided on the basis of mature processes of spiral drill hole-forming and pile-forming through central pressure filling of pumping concrete; when a pile rotating and extending drill is used for hole forming, a high pressure grouting pump is started to form cement slurry high pressure spray through a slurry spraying device, the cement slurry high pressure spray is used for generating destroying and cutting effects on soil mass structures on the side and at the bottom of the pile, soil mass in a certain range of the side or the bottom of the pile and cement slurry are mixed fully, physical and mechanical properties of the soil mass on the side or at the bottom of the pile are changed effectively, resistance of the pile is improved substantially, and pile diameter of a pile body needs to be expanded at the design position according to engineering design; after bottom expanding or diameter expanding is finished, concrete is pressed and filled through a center of a concrete pump, slurry mixtures during the bottom expanding and the diameter expanding are replaced, a pile bottom expanding head and a pile side diameter expanding are formed, and end resistance and side resistance of the pile are improved effectively; and then a pile body portion is formed through the central pressure filling of the pumping concrete. The process and device for the rotating and extending pile and the slurry feed device are simple in mechanical structure, do not need to dissemble a drilling rod repeatedly, do not need to lead holes, and do not need to be provided with a post pressure grouting device.

Description

technical field [0001] The present invention relates to the pile-forming process in the construction of building foundations, in particular to a construction process and equipment for rotary-expanding piles integrated with rotary-expansion drilling rig-forming, high-pressure rotary spraying, base expansion and diameter expansion, and central pressure pouring of concrete. It is suitable for forming piles in the construction of composite foundation piles, foundation piles, anti-floating (pull) piles (anchor rods), slope protection piles + curtain piles, etc. Background technique [0002] With the improvement of construction technology, in order to effectively use the land, the proportion of high-rise buildings and super high-rise buildings is increasing. In structural design, the requirements for foundation bearing capacity, total foundation settlement and differential settlement are getting higher and higher. At present, the foundation treatment of high-rise buildings mostly...

AI Technical Summary

Problems solved by technology

[0007] The technical problem solved by the present invention is to provide a construction process, equipment and grouting device for rotary expansion piles, so as to solve the problems that the pile end bearing capacity and pile side friction resistance of foundation piles can be effectively exerted and even need to be greatly improved, so as to reduce work The purpose of saving quantity and cost is to solve the problems and deficiencies in the existing construction technology mentioned above

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