Threaded pile drill pipe for reinforcing local silt layer and method for pile formation of foundation threaded pile including silt layer

Abstract

The invention discloses a threaded pile drill pipe for reinforcing local silt layer and a method for pile formation of a foundation threaded pile including a silt layer. Threads are arranged on the surface of a pipe body of the drill pipe, the internal axis communicates with a pouring cavity up and down, the top end of the drill pipe is rotatably connected with a rotary jet grouting drilling rig distributing device, a power device sleeves the upper pipe body of the drill pipe, a powder ring cavity and an air ring cavity which are on the same axis with the pouring cavity are formed in the uppersection in the drill pipe, the rotary jet grouting drilling rig distributing device is internally provided with channels communicating with the drill pipe pouring cavity, the powder ring cavity and the air ring cavity correspondingly, and external inlets of the channels are used for being connected with a high-pressure flow concrete pump, a high-pressure powder pump and a high-pressure air pump correspondingly; and a round of spaced radial nozzles are formed in the circumferential surface of the pipe body in the middle of the drill pipe, concentric central powder spraying holes on the end faces of the nozzles externally surround air spraying holes, the powder spraying hole communicate with the powder ring cavity, and the air spraying holes communicate with the air ring cavity. The specialdrill pipe is used for reinforcing a silt sandwich layer during hole forming, and the threaded pile with the integral structure is formed.

Description

technical field [0001] The invention relates to the technical field of civil engineering pile forming technology, more specifically, it relates to a threaded pile drill pipe for reinforcing a local mud layer and a method for forming a foundation threaded pile containing the mud layer. Background technique [0002] The threaded pile and its pile-forming method are new pile types based on the long helical drilled pile and the Japanese steel drill-dimensional full-threaded prefabricated pile, which changes the interaction mode between the pile and the soil, and the interface between the pile and the soil A mechanical occlusion is formed, and the principle of "screws are stronger than nails" in common sense is applied to pile construction, so that its stronger characteristics can be realized. The surface of the threaded pile is threaded, which is formed by rotating and extruding the surrounding soil through a special drill pipe with screw teeth. No or a little soil is discharged...

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Problems solved by technology

[0004] The foundation soil belongs to the earth's surface rock and soil, which is formed through complex physical, chemical and biological processes in nature. The geological survey results generally show a layered distribution. The resistance of the pile tip and the side friction of the pile body are used as the bearing capacity of the pile foundation. If there is a muddy soft soil layer with a high water content in the middle, not only will the concrete at the edge of the drill pipe be segregated and dispersed into the silt during the construction stage when the fluid concrete is pumped. In this part, the density of the concrete pile body is loose, and the pump pressure is difficult to control. The current mixing pile uses mud retaining wall or immersed tube to prevent dispersion, but these two measures cannot be taken for threaded piles; and this part has relatively high water content. The high silt soft soil layer has little effect on the side friction resistance of the formed concrete pile, even if the pile side is threaded, it cannot provide a good contribution to the load bearing of the pile

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