Drilling tool for two-way soil-cement mixed pile

Abstract

The invention relates to a drilling tool for a two-way soil-cement mixed pile. The drilling tool comprises an inner drilling rod, an outer drilling rod, an inner drilling bit and an outer drilling bit, wherein a water gas injection device is arranged at the upper part of the outer drilling rod, a cavity between the outer drilling rod and the inner drilling rod is set as a channel enabling water gas to descend, a water gas injection spray nozzle is arranged in the position of an outer drilling core pipe above a lower layer of mixing blades of the outer drilling head, the water gas injection spray nozzle is provided with a spray pipe which is arranged perpendicular to the outer drilling core pipe, spray ports are arranged at the two ends of the spray pipe, a valve cavity is arranged in the middle of the spray pipe, a floating spherical valve core is arranged in the valve cavity, and the middle of the valve cavity is connected with the outer drilling core pipe through a connecting pipe. When a pile is made of cement flour, the quality problem of the pile formed at the upper part due to low water content in a crust layer on the earth surface can be solved by water injection; when the pile is made of cement grout, the quality problem of the pile formed at the deep part due to the lack of dry curing at the deep part of the file can be solved by gas injection; the full pile length pile quality of the two-way soil-cement mixed pile can be ensured; and simultaneously, the drilling pipe is less prone to pipe blockage and can increase the mixing times of the cement flour or the cement grout which is sprayed out and greatly improve construction efficiency.

Description

technical field [0001] The invention relates to soft ground treatment equipment, in particular to a cement-soil two-way mixing pile drilling tool. Background technique [0002] Soft soil foundations are often distributed along my country's coasts and river basins. Under the dynamic effects of loads, cycles, and vehicles, foundation settlement is the main form of foundation failure, which often leads to quality problems in highways, railways, airports, and docks. Among the various methods of dealing with soft soil foundation, the most widely used method is to choose composite foundation. The two-way cement-soil mixing pile selected in soft soil treatment will greatly improve the strength of the composite foundation. However, when using two-way cement-soil mixing piles, there are the following defects. When cement powder is used, due to the hard crust on the surface and low water content, the effect of pile formation in this section is not good; when cement slurry is used, d...

AI Technical Summary

Problems solved by technology

However, when using two-way cement-soil mixing piles, there are the following defects. When cement powder is used, due to the hard crust on the surface and low water content, the effect of pile formation in this section is not good; when cement slurry is used, due to the deep cement The slurry lacks air curing, which affects the quality of the pile; the angle between the inner and outer mixing blades and the horizontal direction is not set properly, which makes the effect of dust pressing or grouting not good, which affects the quality of the pile, and at the same time causes unnecessary load on the pile machine. In addition, due to the improper setting of the nozzle position for spraying cement powder or cement slurry, it is easy to cause pipe blockage

Images