Spiral conical soil compaction pile construction method

Abstract

The invention relates to a spiral conical soil compaction pile construction method and a spiral conical soil compaction drill bit. According to the construction method, compaction and expansion are directly performed in a rock and soil layer, so that the collapse in a pile hole due to poor stability of the compaction and expansion among different rock and soil layers is avoided; the forming of the pile hole comprises the steps that a large-torque power head, a pressurization device, a standard drilling rod and a spiral conical soil compaction bore bit downwards and spirally drill clockwise, a lower part adopting a conical structure of the spiral conical soil compaction bore bit directly drills the hole through compaction and expansion in the rock and soil layer, and is a main soil compaction part; an upper part adopting a columnar structure of the spiral conical soil compaction bore bit assists for soil compaction, so as to guarantee that the hole diameter and the hole are not collapsed; when upward clockwise rotary lifting is performed, the upper part adopting the columnar structure of the bore bit performs compaction and expansion on the hole formed via compaction and expansion once more, as a result, hole shrinkage is prevented. During the upward rotary lifting, the pile hole is filled with piles by starting a concrete conveying pump. The spiral conical soil compaction pile construction method is higher in bearing force, less in settlement quantity, better in the quality of the piles, lower in cost, less in energy consumption, higher in working efficiency and more environmental-friendly, and can realize construction under various geological conditions.

Description

technical field [0001] The invention relates to a construction method of a spiral cone soil squeezing pile and a spiral cone soil squeezing drill bit used in the field of civil engineering. Background technique [0002] In the field of building foundation construction, pile foundation pile formation methods can be divided into soil-discharging piles and non-soil-discharging piles. [0003] Construction methods such as long helix CFG, percussion drilling and rotary drilling, etc., have the disadvantages of low pile bearing capacity, high cost and high cost of cleaning and dumping and waste mud. [0004] There are two types of non-drainage piles: prefabricated piles and cast-in-place piles. Prefabricated piles have the disadvantages of expensive manufacturing equipment, high production cost, long pile body, difficult transportation, and are only suitable for soft soil layers and small pile diameters. Cast-in-place piles include screw piles and two-way spiral extruded and exp...

AI Technical Summary

Problems solved by technology

Screw piles require high technology for synchronous control of pile-forming equipment. For the uncertainty and non-uniformity of soil layer and soft and hard changes, it is difficult to ensure that the pile-forming rock and soil screw teeth do not flex, and false screw teeth will be formed. Reduce the bearing capacity of the pile and cannot be applied to hard ground

The two-way spiral extruded pile adopts the hole-forming method of drilling first and then extruding. During the down-rotation drilling process, the soil is drilled out by using the cylindrical auger bit part of the two-way helical extruding and expanding drill bit, and transported from bottom to top by the helical blades. To the part of the cone core tube, the soil is gradually squeezed into the side wall of the pile hole through the cone core tube. In complex strata such as clay and gravel layers, the rock and soil produced by rotary drilling will block the transportation path formed by the spiral blades, and it is easy to cause the drilling phenomenon; The stability between the stratum and the extruded soil is poor, and there will be a collapse phenomenon, which will seriously bury the drill

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