Disclosed are a construction method and a construction system for eliminating sand liquefaction. The construction system includes a first drilling rod, a pneumatic down-the-hole (DTH) hammer installed on the first drilling rod, an air compressor drivingly connected with the pneumatic DTH hammer, a driving motor drivingly connected with the first drilling rod and a high-pressure pump connected with the first drilling rod; and the construction method includes following steps: measuring the ground to be constructed to determine the pile position to be constructed; controlling the air compressor to drive the pneumatic DTH hammer to drill holes in the pile position to be constructed, controlling the driving motor to drive the first drilling rod to rotate around an axis in an up-down direction, and controlling the high-pressure pump to spray the cement slurry toward a circumferential side of the first drilling rod.

Methods for installing soil and sand stabilization columns using a chemical polymer are provided. The chemical polymer can be a liquid acrylic base chemical polymer or a liquid vinyl acetate base chemical polymer. In the methods, a dilution rate of a chemical polymer is determined based on at least one of: a moisture content of the soil at a selected soil location, a particle size distribution of the soil at the selected soil location, a shear strength of the soil at the selected soil location, a target strength of the soil stabilization column, and a target stiffness of the soil stabilization column. The chemical polymer is then diluted based on the determined dilution rate. The diluted chemical polymer is inserted into a selected soil location and mixed with in-situ soil or with sand to form a stabilization column.

The invention includes digging equipment having a self-propelled base machine provided with an arm that supports a digging tool. The digging tool is provided with a device for crumbling soil. The digging tool is operatively connected to the base machine through a suspending flexible element that can be wound or unwound by a winch arranged on the base machine. The base machine also includes a main power engine, to actuate all the hydraulic apparatuses of the digging equipment, and a hydraulic system consisting of two independent and separate hydraulic circuits (S; U). A first hydraulic circuit (S) is configured to control and supply the main service apparatuses of the base machine, including a movement apparatus for moving the digging tool. A second hydraulic circuit (U) is configured to control and supply the main digging apparatuses of the digging tool, including at least the actuators of the device for crumbling soil.

Described herein are tools, systems and methods for conditioning, strengthening and/or improving in situ soil geotechnical or agricultural properties while at least temporarily reducing soil density, energy requirements, and tool wear.

The invention relates to a ground-working machine and a method for producing wall panels, with the ground-working machine having at least two elongate drilling and mixing tools arranged parallel to each other, which comprise a rod-form base body, on which a first screw conveyor and at least one second screw conveyor are arranged, the second screw conveyor being axially spaced apart from the first screw conveyor. According to the invention it is provided that at least on one drilling and mixing tool at a lower end the first screw conveyor is formed with an outer diameter that is greater than an outer diameter of the second screw conveyor which is arranged above the first screw conveyor.

The invention relates to a trench cutter and a method for producing a cut trench in the soil having a cutter frame, at least one pair of cutting wheels which are supported and driven in a rotatable manner on a lower end of the cutter frame, wherein each cutting wheel has a plurality of cutting teeth along its outer circumference, and a supply and/or discharge means for supplying or discharging a cutting liquid to or from the cut trench in the region of the cutting wheels. According to the invention provision is made in that spaced from the supply and/or discharge means a cleaning device is provided for cleaning the cutting wheels during the cutting operation with a cleaning fluid and in that the cleaning device has a plurality of cleaning nozzles which are directed onto the outer circumference of at least one cutting wheel and designed to inject the cleaning fluid to loosen adhering soil material.

A ground improvement apparatus includes: an irrotational sun gear fixed to an irrotational inner pipe inside a rotatable outer pipe; a planetary gear rotatably supported on a rotatable agitation shaft and configured to rotate while meshing with the sun gear; and an inverse rotation mechanism meshing with the planetary gear and rotating the agitation shaft in an opposite direction of the planetary gear. The agitation shaft is suspended on a connection member attached to the outer pipe so as to rotate in synchronization with a rotation center of the inverse rotation mechanism. A ground where the outer pipe is penetrated and a solidifying material discharged from the agitation shaft are agitated and mixed with each other by agitation blades radially attached to the agitation shaft with a trajectory of distal ends of the agitation blades drawing a substantially polygonal shape by rotation of the agitation shaft.

A drill including a drill flight where the drill flight changes angle from a primary flight angle (A1) to a secondary flight angle (A2).

A ground improvement apparatus includes: an inner shaft arranged inside an outer pipe and including a mechanism for rotating a crank at a rotation speed four times as fast as that of the outer pipe; agitation blades supported by the outer pipe so as to reciprocate in a radial direction of the outer pipe and including discharge outlets; and a slider crank mechanism for converting a rotation movement of the crank to a reciprocating movement of the agitation blades. A ground at a location where the outer pipe is penetrated and a solidifying material discharged from the discharge outlets are agitated and mixed with each other to form an improved body having a substantially rectangular cross section by rotating the agitation blades while advancing and retreating the agitation blades relative to each other via the slider crank mechanism by rotation of the crank.

A cutting tool adapter for creating an underpinning structure and method of creating the underpinning structure are provided. In some examples, the cutting tool adapter may connect a cutting tool to a working machine arm to enable the cutting tool to cut and dislodge soil below an existing foundation or structure. As the soil is cut and dislodged, it is mechanically mixed with an additive, such as a cementitious material, via the cutting tool. The mixed soil and additive may then harden in the area below the existing structure or foundation to create an underpinning structure to provide additional support for the existing structure or foundation.