A grouting system with an adjustable moving cavity pressure. The grouting system includes a master grouting pipe and a plurality of grouting valve pipes connected to the master grouting pipe, each grouting valve pipe is in an annular space within a borehole wall, the grouting valve pipe includes a grouting valve pipe body, and a spraying valve port is on the grouting valve pipe body. A grouting pipe, an air injection pipe and a movable piston are inside the grouting valve pipe body. The air injection pipe is connected with the movable piston to apply an air pressure into the movable piston, and the movable piston applied with the air pressure expands in volume to form a closed cavity between a lower part of the movable piston and the grouting valve pipe body, so that grouting is performed according to the position of the movable piston.

A grouting system with an adjustable moving cavity pressure. The grouting system includes a master grouting pipe and a plurality of grouting valve pipes connected to the master grouting pipe, each grouting valve pipe is in an annular space within a borehole wall, the grouting valve pipe includes a grouting valve pipe body, and a spraying valve port is on the grouting valve pipe body. A grouting pipe, an air injection pipe and a movable piston are inside the grouting valve pipe body. The air injection pipe is connected with the movable piston to apply an air pressure into the movable piston, and the movable piston applied with the air pressure expands in volume to form a closed cavity between a lower part of the movable piston and the grouting valve pipe body, so that grouting is performed according to the position of the movable piston.

A drive point for a substantially tubular, in particular hollow cylindrical, driven pile having a pile core through which concrete can be introduced into the driven pile, wherein the drive point can be fitted onto a pile end of the driven pile, wherein at least one first supporting web with a first contact surface for an end face of the pile end is arranged on an inner wall of the drive point, wherein starting from a plane of a first bearing surface the drive point has a cavity which extends at least partially in a driving direction and into which concrete can be introduced through the pile core when the driven pile is fitted, wherein at least one concrete outlet channel is provided which connects the cavity to an upper edge of the drive point.

Soil displacement piles having a shaft and one or more soil displacement assemblies secured to the shaft are provided. If more than one soil displacement assembly is utilized, each soil displacement assembly is separated by a longitudinal distance. Each soil displacement assembly has an upper helical plate, a lower helical plate and separated from the upper helical plate by a longitudinal plate distance, and at least one soil displacement plate positioned relative to the shaft, the upper helical plate and the lower helical plate.

A pile-forming method for a compound extruded and expanded pile, comprising using a compound extrusion and expansion drilling tool of pile-forming equipment for a compound extruded and expanded pile to drill, extrude, and expand to form a bore, wherein when upwardly rotating and lifting, expansion bodies of the compound extrusion and expansion drilling tool enlarge, and at the same time, a concrete pump is started up to pour a pile material under pressure into the pore for the pile, to reach a pile top mark height, obtaining a compound extruded and expanded pile. Pile-forming equipment for a compound extruded and expanded pile is also disclosed, comprising a compound extrusion and expansion drilling tool and a control system thereof. The compound extrusion and expansion drilling tool comprises a drill stem. A plurality of expansion bodies are provided on a threaded section of a drill bit of the drill stem.

A pile-forming method for a compound extruded and expanded pile, comprising using a compound extrusion and expansion drilling tool of pile-forming equipment for a compound extruded and expanded pile to drill, extrude, and expand to form a bore, wherein when upwardly rotating and lifting, expansion bodies of the compound extrusion and expansion drilling tool enlarge, and at the same time, a concrete pump is started up to pour a pile material under pressure into the pore for the pile, to reach a pile top mark height, obtaining a compound extruded and expanded pile. Pile-forming equipment for a compound extruded and expanded pile is also disclosed, comprising a compound extrusion and expansion drilling tool and a control system thereof. The compound extrusion and expansion drilling tool comprises a drill stem. A plurality of expansion bodies are provided on a threaded section of a drill bit of the drill stem.

A concrete forming tube formed from a thermoplastic material and having a first end, a second end, and a substantially uniform circumference from the first end to the second end.

A concrete forming tube formed from a thermoplastic material and having a first end, a second end, and a substantially uniform circumference from the first end to the second end.

The disclosure belongs to the technical field of engineering construction, and particularly relates to a square pile construction method and equipment of a rotary drilling rig. The specific technical solution concerns a square pile construction method of a rotary drilling rig which includes: site leveling; surveying and setting out; creating concrete retaining wall of wellhead; putting the drilling rig in place; adjusting the verticality of the drilling rig; lead hole drilling; reamed hole drilling; square hole drilling; hole cleaning with round drill bit; and hole cleaning with square drill bit. The square pile construction method and rotary drilling rig can use equipment for square pile construction in the whole process, effectively reduce the underground operation of laborers, and avoid the project safety production risk from the source. The disclosure also provides three kinds of square pile drill bits and a square pile hole cleaning drill bit in cooperation with the square pile construction method, which further realizes the mechanization of the whole process of square pile construction.

The invention relates to a pile installation system for providing a pile in the ground, comprising; an elongate pile installation tool for forming a bore hole and having a distal end, an end member for coupling to the distal end of the pile installation tool, and an electromagnetic device for releasable magnetically coupling the end member to the pile installation tool.