Underground continuous wall construction technique of multi-spindle long spiral drill pipe occluding pile

Abstract

The invention relates to an underground continuous wall construction technique of multi-spindle long spiral drill pipe occluding pile, which belongs to deep foundation and underground continuous wall construction technique and is suitable for construction of deep foundation maintenance walls in civil engineering and deep foundation of buildings. In the construction technique, a plurality of long spiral drill pipes (3) are adopted, wherein continuously spiral blades are arranged along the whole length of the outer walls of the drill pipes, and the drill pipe cores are hollow. During work, a drive set (2) drives the long spiral drill pipes (3) to carry out drilling operation simultaneously in such a way that two adjacent drill pipes rotate in opposite directions, so that large-caliber and large-depth construction is realized; and the spiral blades of adjacent long spiral drill pipes rotate in opposite directions so that the spiral blades can occlude each other in the whole length all the time to effectively ensure the constructing quality of the buildings. The invention can reduce the use level of steel products, effectively reduces the cost of the engineering and only discharges dry soil during the construction so as to be beneficial to the spot management of the construction and achieve environmental-friendly construction.

Description

technical field [0001] The multi-axis long auger rod occlusal pile underground diaphragm wall construction technology relates to deep foundation and underground diaphragm wall construction technology, and is suitable for deep foundation pit maintenance wall of civil engineering and deep foundation construction of buildings. technical background [0002] At present, when carrying out the deep foundation pit maintenance wall of civil engineering and the deep foundation construction of buildings, the construction techniques commonly used at home and abroad include CFG pile technology, BNT construction method, and SMW construction method. The CFG pile technology, also known as the long helical post-cage grouting pile technology, uses a single-axis long helical drilling rig to drill the hole to the pile bottom level, then pumps the concrete into the pile hole through a hollow drill pipe, and lifts it up while pumping the concrete. Drill the pipe to form a concrete pile, and then ...

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Problems solved by technology

Although this construction method has the advantages of high construction efficiency and low cost, it has three defects: first, the strength of the cement-soil mixing wall formed is very low and cannot be used as a permanent structure; The complex is a non-rigid structure. When used as foundation pit support, it deforms greatly during the excavation of the foundation pit. When it is adjacent to important buildings and underground pipelines, it is generally difficult to meet the requirements of deformation control; third, the SMW construction method The drill pipe used has discontinuous mixing blades, that is, it is not engaged in full length, so during the drilling process, the soil in the hole cannot be completely discharged, but the soil and cement slurry can only be mixed together. Therefore, this construction method also cannot carry out the deep foundation pit maintenance two walls in one, the deep foundation of the building and the construction of the underground diaphragm wall

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