Abstract: Methods and apparatuses for compacting soil and granular materials are disclosed. In some embodiments, the soil compaction apparatuses include an arrangement of diametric expansion elements that, in their expanded state, form a larger compaction surface. In another embodiment, a compaction chamber can be provided with diametric restriction elements and a flow-through passage in the upper portion of the chamber exterior of a drive shaft. The diametric expansion or restriction elements can be fabricated from, for example, individual chains, cables, or wire rope, or a lattice of vertically and horizontally connected chains, cables, or wire rope. Embodiments of the soil compaction apparatus include, but are not limited to, closed-ended driving shafts, open-ended driving shafts, flow-through passages, no flow-through passages, removable rings for holding the diametric expansion/restriction elements, and any combinations thereof.

Abstract: The invention relates to a method and a device for producing a foundation element in the ground, wherein a hole is formed in the ground which is filled with a hardenable filling mass in order to form the foundation element. According to the invention provision is made in that prior to the hardening of the filling mass a data carrier is introduced into the hole, on which information on the produced foundation element is stored .

Abstract: Provided is a helical pile having an elongated shaft, at least one helical blade on the shaft having a leading edge and a trailing edge, and a displacement paddle extending outward from the shaft longitudinally positioned between the leading and trailing edges of the blade to push away soil to create a grout channel surrounding the shaft. At least one grout propeller may be provided on the shaft, having at least one blade pitched an opposite direction from the helical blade to propel grout downward in the grout channel as the pile rotates.

Abstract: Provided is a helical pile having an elongated shaft, at least one helical blade on the shaft having a leading edge and a trailing edge, and a displacement paddle extending outward from the shaft longitudinally positioned between the leading and trailing edges of the blade to push away soil to create a grout channel surrounding the shaft. At least one grout propeller may be provided on the shaft, having at least one blade pitched an opposite direction from the helical blade to propel grout downward in the grout channel as the pile rotates.

Abstract: The disclosure is directed to methods of making and using a water treatment composition for improved water infiltration during irrigation of agriculture. These methods include combining additives with an aqueous fluid to create a treated irrigation water, wherein the additives comprise a preselected amount of a surfactant and a preselected amount of a displacement ion. The improved infiltration is obtained through a constant, or substantially constant, application of the treated irrigation water to the soil during the irrigation.

Abstract: The disclosure is directed to methods of making and using a water treatment composition for improved water infiltration during irrigation of agriculture. These methods include combining additives with an aqueous fluid to create a treated irrigation water, wherein the additives comprise a preselected amount of a surfactant and a preselected amount of a displacement ion. The improved infiltration is obtained through a constant, or substantially constant, application of the treated irrigation water to the soil during the irrigation.

Abstract: A structural assembly and a method are disclosed for an improved foundation element post-grouting technique incorporating a piston arrangement that consists of a barrel at the base of a pier or pile. Grout is pumped into the barrel via one or more conduits and the pressure from the grout exerts downward pressure on the barrel forcing it into the geomaterial below the foundation element and increasing the load bearing capacity of the foundation element. This assembly and method functions to contain the grout within the target grout area beneath the foundation element while simultaneously providing a means for measuring the strength of the geomaterial below the foundation element and the strain and movement associated with the geomaterial and the pier or pile.

Abstract: A piling machine with high-pressure jet spiral bit, including an underpan, a pile frame, a drill pipe, a drill bit having an upper leaf helix, a lower leaf helix and a middle leaf helix, a power system, a high-pressure concrete casting system and a high-pressure jet grouting system. The drill bit is disposed at the head of the drill pipe and has multiple nozzles disposed thereon, a diameter of the middle leaf helix is constant from the top to the bottom thereof, a diameter of each of the upper leaf helix and the lower leaf helix decreases from the top to the bottom thereof so that the drill bit with upper and lower tines is formed, the drill bit is spiral, the high-pressure jet grouting system is disposed in the drill bit, and the nozzles are disposed on the drill bit. A piling method is also taught herein.

Abstract: This invention relates to a method for forming a mono pile foundation in soil for a wind turbine tower including drilling a plurality of holes into the soil, the plurality of holes being arranged along a curve having a contour corresponding to a cross-dimensional shape of the mono pile, and placing the mono pile in an annular cavity, the annular cavity being formed by the plurality of holes alone and/or by the mono pile breaking up intermediate soil walls between adjacent holes in the plurality of holes while being placed therein. A foundation in soil for a wind turbine tower, a wind turbine comprising such a foundation, and use of such a foundation in a wind turbine is also disclosed.

Abstract: A jetting system for installing foundation underpinning is disclosed. In some embodiments, the jetting system includes a pile having one or more pile segments, an elongated reinforcing tubular member, and a jetting tube. Each of the one or more pile segments includes a throughbore passing axially through the head and the trunk. The throughbores of the one or more pile segments are vertically aligned forming a passage through the pile. The elongated reinforcing tubular is disposed within the passage, and the jetting tube is inserted into the reinforcing tubular.

Abstract: A method of forming in-situ pilings in clay soil. An auger stirrer is rotatably and axially forced into the ground. Water, dry binder (cement/or lime), and air are injected to lubricate the tool, and liquify the mix of clay soil, binder and air to form a uniform structure, most of the air percolating from the mix before it hardens.

Abstract: A structural pile assembly includes a driven pile and pressurized grout contained beneath the pile so as to exert an upward force on the pile. An enclosure, such as a bladder or bellows, is filled with grout from a reservoir via a conduit which preferably extends axially along the length of the pile and is left in place after the grout hardens. A pressure gauge measures the pressure of the grout within the enclosure, permitting the direct measurement of end bearing and side bearing capacities of the resulting pile assembly. The load bearing capacity of the pile is enhanced by the pressurized grout, and is preferably at least twice the end bearing capacity of an unpressurized pile.

Abstract: There is provided a screwed steel pile, the end portion of which is open, characterized in that: an apparent resistance at the pile end portion of the pile is reduced when the ground strength is suddenly increased, so that the pile can be easily penetrated into the ground and an intensity of the finally obtained bearing capacity of the pile is high. The specific means is that a pile end portion of the pile body composed of a steel pipe or a hollow pipe made of another material is made open, and one or a plurality of wings are provided on the outside of the pile end portion of the pile body. The pile end portion of the wing may be protruded downward from a pile end face of the pile body.

Abstract: A method and special mechanical apparatus for installation of support pier for structure comprises positioning a hollow tube apparatus in a soil matrix wherein the hollow tube apparatus has a hollow core and is susceptible to lateral and longitudinal movement, removing soil from the hollow core and then filling that core with an aggregate followed by raising and lowering of the hollow tube apparatus by means of a special bottom mechanical device in a manner which compacts the aggregate and also applies lateral forces to the aggregate against the walls of the cavity in the soil matrix, pushing a portion of the aggregate into the soil matrix.

Abstract: The invention provides a structure of a pile head joint portion and a pile had fitting tubular body which can absorb an execution error for constructing a pile leading to a problem in the case of precasting a board for supporting an upper structure in order to intend to shorten a process, and can improve a strength of the pile head joint portion. A precast board (5) is manufactured by embedding a pile head fitting tubular body (2) which is constituted by a side plate (23) forming a pile head fitting tubular body (2) and a closing plate (22) closing open one end of a tube body, and forms an opening portion (26) in another end open so as to freely fit a pile head. The pile and the board are integrally formed by fitting the pile head portion to the pile head fitting tubular body (2) after constructing the pile, and charging an injection material (4) into the pile head fitting tubular body (2).

Abstract: An in-ground lifting system and method are provided that is operable for raising a structure and its foundation at least several feet. In one presently preferred embodiment, the method is utilized to raise the structure above any anticipated flood levels to thereby prevent future flooding of the structure. In a preferred embodiment, a plurality of excavations are formed underneath the foundation, such as with a hydro-excavator. A sleeve with seal members and hydraulic lines is installed and aligned within each excavation. Hardenable material is poured outside the sleeve to form a cylinder. Hardenable material is poured inside the sleeve to form a piston. Fluid is pumped through the hydraulic lines to lift the structure and the foundation.

Abstract: An improved method of making a foundation for a wind turbine comprises: a) forming a pit, b) providing a cylindrical open-bottomed steel can, c) lowering the can into the pit, d) accurately aligning the steel can, e) concreting the steel can in position in the pit, and f) back-filling the interior of the can.

Abstract: A structural pier assembly includes a cementitious pier and pressurized grout contained beneath the pier in the shaft so as to exert an upward force on the pier. An enclosure, such as a bladder or bellows, is filled with grout from a reservoir via a conduit which preferably extends axially along the length of the pier and is left in place after the grout hardens. A pressure gauge measures the pressure of the grout within the enclosure, permitting the direct measurement of end bearing and side bearing capacities of the resulting pier assembly. The load bearing capacity of the pier is enhanced by the pressurized grout, and is preferably at least twice the end bearing capacity of an unpressurized pier.

Abstract: An apparatus for erecting a foundation element in a ground surface including a drilling device, a pumping device, a pressure transducer and a control unit. The drilling device includes a hollow core tube and an auger bit adapted to drill a hole in the ground surface while the pumping device is adapted to pump a solidifying suspension material under pressure through the hollow core tube and into the hole in the ground surface. In addition, the pressure transducer is mounted on the core tube and is adapted to provide a pressure signal indicative of a pressure of the solidifying suspension material in the core tube while the control unit is adapted to control the pressure of the solidifying suspension material.

Abstract: A method is provided for centrifugally forming a subterranean, cylindrically shaped soil-cement casing in material located in a subterranean earth situs. A soil processing tool is advanced and rotated into the subterranean situs and as the tool advances a high velocity cement slurry is introduced through said tool to hydraulically divide the pieces of soil into particles and to mix the cement slurry with the particles to form a soil-cement slurry. As the soil processing tool is then withdrawn from the situs, the tool is rotated at a speed to exert a centrifugal force by the tool on the soil-cement slurry in excess of two G's, causing the solids of the soil-cement slurry to migrate away from the center of the hole to form a first cylindrical region at the edge of the hole and a second cylindrical region at the center of the hole. The first region has more of the dense solids and the second internal region has a greater proportion of free water and less of the dense solids.

Abstract: A method of forming a cast-in-situ pile with an enlarged head, wherein a collar (1,13) is releasably affixed to the lower end of a piling tool (10) and the piling tool (10) and the collar (1,13) are driven to a first depth and the collar (1,13) is released from the piling tool (10). The piling tool (10) is then driven to a second depth, the piling tool (10) passing freely through a central aperture (2,14) of the collar (1,13), which remains at the first depth. The piling tool (10) is then withdrawn, and concrete or grout (20) is supplied to the lower end of the piling tool so as to form a cast-in-situ pile (22). When the lower end of the piling tool (10) again reaches the first depth, the collar (1,13) is lifted from the ground and concrete or grout (20) is supplied into the void left thereby so as to form a pile (22) with an enlarged head (23).

Abstract: A ground anchor device for securing a building foundation and other structures to a ground surface using the subject anchor device. The anchor device is designed to be self advancing when rotated into the ground surface to depths of 10 to 30 feet and greater. The device includes one or more hollow pipe sections coupled together and connected to a pipe extension with drill point. The pipe extension includes a helice therearound for helping advance the anchor device into the ground surface. The pipe extension and hollow pipe sections are driven into the ground using a kelly bar. The kelly bar includes one end having a square drive section which is received inside a square opening in a drive collar. The drive collar is mounted to an inner circumference of the pipe extension. When the kelly bar is rotated, the square drive section of the kelly bar engages the sides of the drive collar for rotating the pipe extension and pipe sections.

Abstract: A ground anchor device for securing a building foundation and other structures to a ground surface using the subject anchor device. The anchor device is designed to be self advancing when rotated into the ground surface to depths of 10 to 30 feet and greater and to engage and penetrate an underground rock formation for providing greater anchor stability. The device includes a plurality of external hollow pipe sections and a plurality of internal pipe sections. The external pipe sections are joined together with helix couplings. Each helix coupling includes a helix around the exterior surface of the helix coupling. The helice are used for driving the external pipe sections into the ground. The internal pipe sections are coupled together and have a hollow cross section with a lower end of one of the internal pipe sections attached to a rock bit.

Abstract: A foundation for masts, posts, pillars, etc., wherein the foundation has a foundation tube (3) which is lowered into a pre-drilled hole (2) in the ground (1), where the pre-drilled hole has a diameter larger than the diameter of the tube (3) and where at least the space between tube (3) and ground (1) is filled with a casting mixture (8), e.g. concrete, a tube (3) is used which is designed with perforations (4) in its lower area. The foundation tube (3) is equipped with a coating which gives the tube protection against corrosion, and possibly also an electrical insulation. The coatings can have a rough surface in order to create the best possible adhesion to the casting mixture. In order to ensure that the coated foundation tube (3) is safely lowered into the hole, it is first lined with a casing (13), which is removed during or immediately after the casting.

Abstract: Method and device for introducing a pipe into the ground. In order to restrict the drive power necessary to the greatest possible extent and to optimize the diameter of the pipe, it is proposed that the soil surrounding the pipe is displaced in the radial direction. To this end the pipe is provided with one or more displacement elements.

Abstract: A hollow, cylindrical pier foundation is constructed of cementitious material poured in situ between inner and outer cylindrical corrugated metal pipe shells. The foundation is formed within a ground pit and externally and internally back filled. The lower end of the foundation has a circumferential ring fully embedded therein and sets of inner and outer circumferentially spaced bolts have their lower ends anchored to the anchor ring, their upper ends projecting up outwardly of the top of the foundation and a majority of the midportions thereof free of connection with the cementitious material of which the foundation is constructed. The base flange of a tubular tower is positioned downwardly upon the upper end of the foundation with the upper ends of the inner and outer sets of bolts projecting upwardly through holes provided therefor in the base flange and nuts are threaded downwardly upon the upper ends of the bolts and against the base flange.

Abstract: An apparatus for constructing subterranean structures, soil-chemicals mixture or soil-agents mixture by using a multi-shaft auger machine to mix soil with a chemical hardener in situ in a borehole. As the auger shafts of the multi-shaft auger machine penetrate the soil, a plurality of lateral support structures shear soil and provide additional lateral support. The plurality of lateral support structures are spaced vertically by a length no greater than thirty feet. Additionally, soil fragmentation members attached to the lateral support structures fragment soil reconsolidations to aid in mixing of soil. The soil fragmentation members have a length no greater than the difference between the radius of at least one auger blade and the radius of the shaft and no less than one-third the difference between the radius of at least one auger blade and the radius of the shaft.

Abstract: The invention is a method of installing an outer-cased piling through a zone of subsoil contamination which includes boring a hole to a predetermined depth below the contamination, placing a smaller diameter casing in the full length of the hole, pumping a cementitious material between the outer casing wall and the soil, installing the piling through the casing and down to a point of refusal below the contaminated zone, filling the piling form with cement and then filling the void between the piling and casing with a cementitious material.The outer-cased piling design allows the piling installation through zones of contamination without adversely impacting the environment or spreading the contamination to other subsurface layers.

Abstract: The present invention relates to a method for improving the ground of a large area. The method comprises the steps of inserting a pipe into a hole previously dug in the ground, injecting a high pressure liquid and a ground improving injection liquid from an injecting apparatus attached to the tip of the pipe, drawing up the pipe, grouting the ground, and injecting the ground improving injection liquid to thereby form an underground columnar consolidation body for improving the ground. The drawing-up operation of the pipe is executed while applying vertical vibration to the pipe. Thus, a consolidation body of a large area for improvement of the ground is obtained without concave and convex portions.

Abstract: The invention is a method of installing an outer-cased piling through a zone of subsoil contamination, and the apparatus used therein, which includes boring a hole to a predetermined depth below the contamination, placing a smaller diameter casing in the full length of the hole, pumping a cementitious material between the outer casing wall and the soil, installing the piling through the casing and down to a support layer well below the contaminated zone, filling the piling form with cement and then filling the void between the piling and casing with a cementitious material.The outer-cased piling design allows the piling installation through zones of contamination without adversely impacting the environment or spreading the contamination to other subsurface layers.

Abstract: A post construction kit for constructing a post implanted in a base terrain which includes a first post section adapted for implantation in the base terrain, at least one other post section adapted for interconnection with the post section to be implanted underground, and an interconnecting arrangement for interconnecting the underground section and at least one other post section.

Abstract: During setting of anchors in loose rocks ranging from cohesion-poor to non-cohesion rocks, an anchor including a drilling rod and a drilling crown is used, in which the drilling rod is provided with a central axial opening and with radial opening in the region to the drilling crown to supply a mortar suspension or the like through the central axial opening during the drilling process.

Abstract: One or more rotating augers with drilling heads are aligned within a rectilinear casing with a rectilinear cutting head defining one of a plurality of adjacent vertical slots that may be excavated to within about one inch of an adjacent structure or property without encroaching. When a slot is completed it is filled with either a precast or poured-in-place wall element, a plurality of adjacent elements being joined at the edges to form a solid wall without need for forms and shoring or underpinning of the adjacent property or structure.

Abstract: An excavation rod of a ground improvement apparatus is provided with an excavation blade and plural steps of agitation blades above the excavation blade. A corotation prevention blade which does not rotate during the excavation vertically and rotationally, is provided between the excavation blade and the agitation blade and plurality of downwardly projecting fingers are secured to the corotating prevention blade.

Abstract: An improved pipe pier inserting tool comprising at least two separate driving means, attached to two separate gripping means, whereby a pipe pier held within the gripping means can be forced, either in tandem or sequentially, by the two driving means into unstable soil beneath a building foundation so as to add new support.

Abstract: A device for injecting grout around a tubular pile driven into the ground. The tubular pile has a given diameter and is formed by a tubular wall of a given wall thickness defining the inside and outside of the tubular pile. A grout feed channel capable of being driven into the ground with the tubular pile is disposed inside the tubular wall having a diameter which is small relative to the diameter of the tubular pile. A check valve is connected to the grout feed channel at a position along the tubular wall and extends through the thickness of the tubular wall so as to communicate from the grout feed channel through the outside of the tubular wall. An injection device is inserted in the grout feed channel having one plug which is fitted in the grout feed channel and located above the check valve so as to inject grout under pressure through the injection device and the check valve to the outside of the tubular wall.

Abstract: A grouting well pipe for a water well. The grouting well pipe has a central well pipe with at least one grouting tube attached along its length. The grouting tube is sealed along its lower end and length to prevent clogging of the grout tube during insertion of the grouting well pipe into a water well. The grouting tube has a grout release structure thereon for release of grout into the space between the grouting well pipe and the water well in response to pumping grout at a predetermined pressure into the grout tube. This seals the space effectively from surface contamination entering the well.

Abstract: A tool for inserting pipe piers, the method of forming such piers and a pressure grouted pier are disclosed. The tool utilizes a complementary double clamping system which allows faster pipe insertion and minimizes loading and unloading of the foundation as the pipe is driven. The tool further allows for pressurized grout to be forced through the pipe and into a volume along at least a portion of the length of the pipe to form a pier having improved stability in unstable soil.

Abstract: A concrete pile installation apparatus and method is disclosed wherein a device penetrates the soil to produce an opening for the formation of the pile. Fill material, such as grout, is introduced into the opening and a potential vacuum void created in the formation of the pile is vented to the atmosphere to prevent the pulling of surrounding soil into the opening and thereby causing the formation of a defective pile.

Abstract: Process using a ground anchor (1) with a longitudinal hole (7), on which is fitted an interface device (12) comprising a cylinder containing a chamber connected to the said hole (7); a grout is pumped under pressure to the tip (6) of the hole in the ground; the cylinder is struck mechanically, and transmits the mechanical shock wave to the ground anchor. The grout injected is a liquid mix (L); the grout is injected by means of a pump (21) at a pressure greater than 20 MPa; the grouting pressure is sufficient to fragment the ground by means of the injected grout, and the cylinder is struck by a percussion/vibration hammer (2) at a frequency greater than 10 Hz.

Abstract: The invention provides a pile construction method which allows repeated formation of a supplemental base concrete body at the bottom of a cast-in-place pile, wherein before a previously introduced cement mortar consolidates at the bottom of the pile, a soil stabilizing liquid agent is injected through an injection tube which extends to the bottom of a pile so as to penetrate into the earth surrounding the bottom of the pile. After the cement mortar consolidates, the flow passages of the soil stabilizing agent become permanent passages in the pile base for a next injection of cement mortar.

Abstract: To the drill pipe connects a head comprising a cylinder-shaped portion and a cone-shaped point. Three spiral ribs are regularly distributed over the head. Each rib has a downwardly-extending rib portion standing on the point and having an outer side making an angle between 0.degree. and 5.degree. with the drill axis and an inner side making with the outer side of the point an angle which is smaller than 90.degree. increased by half the apex of the point, and has a outwardly-extending rib portion standing on the cylinder-shaped head portion and having a top side making an angle between 85.degree. and 95.degree. with the outer side of this head portion. The lowermost edge of the rib portion standing on the point merges into the outermost edge of the other rib portion. The apex of the point lies between 85.degree. and 95.degree..

Abstract: Method for making an elongated support column extending downwardly into the ground which may be used in the construction of foundation piling, tension anchors and related installations, the method comprising generally the steps of providing a rigid elongated hollow driving mandrel with radial apertures in the lower section and having a driving foot on its lower end; passing the driving foot through and displacing the ground to form a space with a cross-sectional area greater than the mandrel in the wake of the driving foot until the uppermost radial apertures in the driving mandrel are below the level of the ground; continuing the driving of the driving mandrel and foot by introducing liquified fill material under pressure into the hollow portion of the mandrel, the pressure being adjusted so as to fill the space between the mandrel and the walls of the hole so as to prevent the ground from collapsing upon the mandrel; allowing the liquified fill material to solidify when the desired depth has been reached.

Abstract: The device comprises:a beating cap (1) provided with a conduit (2) for introduction of the concrete under pressure;a pipe form (3) to be sunk and pulled out gradually as the concrete is introduced, the pipe form having a fastening (4) connected to a pressure gauge (4') for reading of the pressures acting on the concrete;a chuck (5) located between the pipe form (3) and having a conduit for passage of the concrete (2) under pressure and a cylindrical sheath (6) for reducing volume;two expandable tubular rings (7,7') to make a seal for the air under pressure in the air chamber (8) between the pipe form (3) and the chuck (5) to achieve locking between the chuck (5), the pipe form (3) and the beating cap (1);a one-time bottom (9) to prevent penetration of dirt in the pipe form during sinking;The raising of the pipe form (3) gradually as the concrete is introduced being facilitated by the pressure that is exerted in air chamber (8) by the effect of the introduction of the concrete.

Abstract: A method is provided for making a foundation pile comprising a cylindrical tube (1) with one or more helically extending blades (14,15) at its lower end to which a hardening liquid is supplied that is conducted in such a manner that it penetrates the soil below the helical blade part or parts and along the tube wall (2) thereabove at 13. Said hardable liquid serves as means for removing the friction between pile and soil during screwing in the soil.

Abstract: A tool comprises two coaxial casings, a leading and a trailing ones, connected by a tubular element provided with ports for discharging a fixing material into a hole. The leading casing comprises a cylindrical portion, and frontal and rear conical tips provided with spiral tapered surfaces intended for consolidating soil. The trailing casing has a cylindrical portion of a greater diameter than that of the cylindrical portion of the leading casing. In the trailing casing there is provided an axial duct communicating with a cavity of the coupling element for supplying a fixing material. A method of forming holes having fixed walls includes formation of a pilot hole using the leading casing, and subsequent formation of a hole of a predetermined diameter using the trailing casing in the advancing sinking of a pilot hole.

Abstract: A jet shoe, connected to the lowermost end of a large diameter pipe to be placed in a subsea formation, comprises a cylindrical housing in which is arranged an inner tubular receptacle, a check valve permitting downward flow but preventing upward flow and jet tubes extending from the receptacle through the lower end of the jet shoe. The receptacle, valve and tubes are cemented in the housing. The tubes contain nozzles for jetting fluid to erode formation ahead of the shoe. A stinger arranged on the lower end of a smaller diameter pipe extends into and seals in the receptacle. A closure member on the smaller pipe closes off the upper end of the larger pipe. The smaller pipe and the larger pipe, together with a permanent guide base connected to the upper end of the larger pipe, are lowered to the ocean floor. While jetting fluid through the smaller pipe and out the shoe the formation ahead of the shoe is eroded until the larger pipe reaches a pre-determined depth.

Abstract: Compacted granular or stone columns are constructed in soil to increase the load-bearing capacities of the native soil. The upper portion of the compacted granular column is provided with a rigid central core such that vertical loads imposed on the composite column are transferred to a deeper level on the compacted column where the column operates more efficiently. A probe is centrally penetrated downwardly into the compacted granular column, and the resulting cavity is filled with cementitious grout to form a solid core after hardening. The grout may be injected into the cavity so formed in the compacted column at the bottom of the probe as the probe is being withdrawn in predetermined quantities metered in synchronization with the rate of withdrawal of the probe from the core cavity.

Abstract: A method for constructing continuous concrete walls free from water leakage under the ground, wherein upon hardening of the concrete of a preceding wall panel the space for the next succeeding wall panel is excavated and while placing a reinforcing steel cage in the space for the next succeeding wall panel, at least one injection pipe is inserted along with the steel cage; placing of concrete in this section Portland cement suspension is jetted at a high pressure from a nozzle of the injection pipe, which is pulled up as it is rotated, whereby clay or slime of bentonite or the like between the end faces of adjacent concrete walls is removed by the fracturing and agitating effect of the jet.