Abrégé

The present invention relates to a rotating penetration rod for forming an expanded base reinforcement part of a pile, the rod allowing a pile base to be mounted on an expanded base reinforcement part formed by the rotatable penetration of an underground bearing foundation and the cutting and crushing of the ground by a cutting arm, which has a discharge part, and the mixing of a grouting material therein, thereby enabling a support strength greater than that of a conventional pile to be obtained without penetration of the pile down to the bearing foundation.

Classes IPC  ?

• E02D 5/28 - Pieux préfabriqués en acier
• E02D 5/72 - Sabots de pieux

Abrégé

The present invention relates to a rotational penetration-type composite steel pipe pile having an expanded tip reinforcing portion, wherein the expanded tip reinforcement part including a cylindrical reinforced source ground formed by mixing the cut and pulverized ground and the injection material at a lower portion of a steel pipe pile body is provided, and thus a greater supporting force can be obtained compared to conventional piles, even without a support steel plate penetrating to a support ground, which is a bedrock layer.

Classes IPC  ?

• E02D 5/28 - Pieux préfabriqués en acier
• E02D 5/72 - Sabots de pieux

Abrégé

The present invention relates to a cutting arm for forming an enlarged-tip-reinforcing part of a pile, and a method for constructing a pile having an enlarged-tip-reinforcing part, capable of obtaining a greater bearing capacity than existing piles without inserting a pile to the underground supporting ground, by seating the tip of the pile on the top of the enlarged-tip-reinforcing part formed by cutting and crushing the ground by rotationally inserting the cutting arm having a discharge part into the supporting ground, and then mixing a grouting material.

Classes IPC  ?

• E02D 5/28 - Pieux préfabriqués en acier
• E02D 5/72 - Sabots de pieux

Abrégé

The present invention relates to a cutting arm for a composite steel pipe pile, a rotary penetration-type composite steel pipe pile having an extended base reinforcement part, and a construction method therefor, the cutting arm having, at the lower part of a steel pipe pile, a cylinder- or truncated cone-shaped extended base reinforcement part formed by mixing a grouting material with cut and crushed ground, thereby obtaining bearing strength greater than that of a conventional pile without the penetration of a support steel plate up to bearing ground, which is bedrock.

Classes IPC  ?

• E02D 5/28 - Pieux préfabriqués en acier
• E02D 5/72 - Sabots de pieux

Abrégé

The present invention relates to a composite steel pipe pile provided with a reinforced tip, wherein the reinforced tip including reinforced natural ground in a cylindrical shape is provided at the lower portion of a steel pipe pile body provided with a ring-shaped supporting steel plate on the lower circumference thereof, and thus, a greater permissible support force than that of an existing pile can be obtained without inserting a helix into the supporting ground.

Classes IPC  ?

• E02D 5/28 - Pieux préfabriqués en acier
• E02D 5/72 - Sabots de pieux

Abrégé

The present invention relates to: a pile shoe for an open lower end type intrusion concrete pile, in which the pile shoe manufactured by welding an upper shoe and a lower shoe to each other in a state where a plurality of fastening bolts are arranged between the upper shoe and the lower shoe is bolt-assembled to the lower end of a concrete pile body, thereby enabling omission of on-site welding work; and an open lower end type intrusion concrete pile including the pile shoe.

Classes IPC  ?

• E02D 5/72 - Sabots de pieux
• E02D 5/30 - Pieux préfabriqués en béton ou béton armé ou en acier et béton

Abrégé

The present invention relates to a driven steel pipe pile which can penetrate a remaining slime layer by using a driving shoe having a cross-section having a wide-topped and narrow-bottomed shape connecting the main frame of a steel pipe pile and the lower end of a frictional steel pipe, can be rapidly driven into a foundation and can significantly increase front end supporting power while minimizing the subsidence of the pile, and a construction method therefor. The driven steel pipe pile of the present invention is driven into and supported on the foundation at the lower part of a punched hole by downward pressing power or rotating power. The present invention comprises: a main frame of a steel pipe pile with an opened lower part; a frictional steel pipe which is placed inside or outside on the lower part of the main frame of the steel pipe pile, and has a length of 2 meters or shorter; and a driving shoe which is provided to connect the main frame of the steel pipe pile and the lower end of the frictional steel pipe, and is formed in the shape of a ring with an opened center, wherein both the inner and outer cross-sections of the ring have a wide-topped and narrow-bottomed U or V shape, so as to be driven easily into the foundation at the lower part of the punched hole. The main frame of the steel pipe pile and the frictional steel pipe are installed on both end units on the top surface of the driving shoe.

Classes IPC  ?

• E02D 5/28 - Pieux préfabriqués en acier
• E02D 5/72 - Sabots de pieux
• E02D 5/56 - Pieux à vis
• E02D 7/20 - Mise en place par pression ou traction
• E02D 7/22 - Mise en place par vissage

Abrégé

The present invention relates to a driven concrete pile having an open bottom and a construction method thereof in which a lower member of a point bearing part located on the lower end of a concrete pile main body has a short tubular shape to easily penetrate through a residual slime layer, and the point bearing part, which is wide at the top and narrow at the base, is driven into and supported by the in-situ ground to enhance the pile bearing capability. The driven concrete pile having an open bottom, according to the present invention, which is driven into the in-situ ground below a borehole by a downward pressing force or a rotational force and is supported by the in-situ ground, comprises: a concrete pile main body that is open at the bottom thereof; and a point bearing part that has a sectional shape having an open central portion and being wide at the top and narrow at the base and is provided on the lower end of the concrete pile main body and driven into the in-situ ground through a residual slime layer on the bottom of the borehole, wherein the point bearing part includes: an upper member having inner and outer inclined surfaces and being wide at the top and narrow at the base, the width of the bottom surface of the upper member being less than or equal to two thirds of the thickness of the concrete pile main body; and a lower member having a tubular shape and provided on the bottom surface of the upper member so as to be brought into close contact with the upper member.

Classes IPC  ?

• E02D 5/30 - Pieux préfabriqués en béton ou béton armé ou en acier et béton
• E02D 5/72 - Sabots de pieux
• E02D 7/20 - Mise en place par pression ou traction
• E02D 7/22 - Mise en place par vissage

Abrégé

The present invention relates to a driven concrete pile having an open bottom and a construction method thereof in which a point bearing part on the lower end of a concrete pile main body is driven into the in-situ ground via a residual slime layer on the bottom of a borehole when the pile is press-fit and rotated, thereby enhancing the pile bearing capacity. The driven concrete pile having an open bottom, according to the present invention, which is driven into the in-situ ground below a borehole by a downward pressing force or a rotational force and is supported by the in-situ ground, comprises: a concrete pile main body that is open at the bottom thereof; and a point bearing part that has a sectional shape having an open central portion and being wide at the top and narrow at the base and is provided on the lower end of the concrete pile main body and driven into the in-situ ground through residual slime on the bottom of the borehole, wherein the point bearing part includes upper and lower members separately manufactured and then coupled to each other such that the upper surface of the lower member is brought into close contact with the lower surface of the upper member, the upper and lower members each having inner and outer inclined surfaces and being wide at the top and narrow at the base, and the lower end of the upper member has a width smaller than the thickness of the concrete pile main body.

Classes IPC  ?

• E02D 5/24 - Pieux préfabriqués
• E02D 5/30 - Pieux préfabriqués en béton ou béton armé ou en acier et béton
• E02D 5/72 - Sabots de pieux
• E02D 5/56 - Pieux à vis
• E02D 5/62 - Tassement du sol à la base ou d'un matériau analogue à travers des tubes
• E02D 7/00 - Procédés ou appareils pour la mise en place de rideaux de palplanches, de pieux, de tubages ou d'autres coffrages
• E02D 7/22 - Mise en place par vissage

Abrégé

The present invention relates to a driven concrete pile and a construction method thereof in which a point bearing part on the lower end of a concrete pile main body is driven into the in-situ ground via a residual slime layer on the bottom of a borehole when the pile is press-fit and rotated, thereby enhancing the pile bearing capacity. The driven concrete pile of the present invention, which is driven into the ground below a borehole by a downward pressing force or a rotational force and is supported by the ground, comprises: a concrete pile main body having an empty space formed in the middle thereof and being open at the bottom thereof; and a point bearing part having a shape in which the central portion is open and provided on the lower end of the concrete pile main body, wherein the point bearing part has a sectional shape having inner and outer inclined surfaces and being wide at the top and narrow at the base, the width of the lower end of the point bearing part being less than or equal to one-third of the thickness of the concrete pile main body, and a part or the entirety of the point bearing part is driven into the in-situ ground through residual slime on the bottom of the borehole.

Classes IPC  ?

• E02D 5/24 - Pieux préfabriqués
• E02D 5/30 - Pieux préfabriqués en béton ou béton armé ou en acier et béton
• E02D 5/56 - Pieux à vis
• E02D 5/60 - Pieux avec fourreau de protection
• E02D 5/72 - Sabots de pieux
• E02D 7/20 - Mise en place par pression ou traction
• E02D 7/22 - Mise en place par vissage

Abrégé

The present invention relates to a diameter-enlarging system for an expandable pile, comprising: a pile main body; a diameter-enlarging member of which the diameter is enlarged by being coupled to a lower portion of the pile main body; a pressing body for enlarging the diameter of the diameter-enlarging member; and a pressing part for delivering a pressing force of the pressing body to the diameter-enlarging member, wherein the allowed supporting force of the pile can be increased by rapidly expanding the diameter of and cutting the ground at a front tip of the pile while forming a pile enlargement part. According to the present invention, the diameter-enlarging member is coupled to the lower portion of the pile main body and comprises: an upper guide member provided with an upper through-hole at the center; a lower guide member provided below the upper guide member and so as to be a specific distance apart from the upper guide member; a connection member, which is coupled so as to communicate with the upper through-hole and is provided with a plurality of access holes on an outer circumferential surface, for connecting the upper guide member and the lower guide member; and arc-shaped expanding bodies, which are provided in a plurality along the outer circumferential surface of the connection member between the upper guide member and the lower guide member, and which are provided with a cutting tip on the outer side, wherein the pressing part is configured so that a rear end is positioned inside the connection member and a front end is inserted into the access holes on the connection member so as to be brought into close contact with the rear end of the expanding bodies, to expand the expanding bodies out of the upper and lower guide members by pushing the expanding bodies while the pressing member protrudes out of the connection member due to the pressing of the pressing body, and wherein the pressing body presses the rear end of the pressing part by moving downward through the upper through-hole in the upper guide member.

Classes IPC  ?

• E02D 5/54 - Pieux ayant des supports ou des éléments d'ancrage préfabriquésPieux d'ancrage

Abrégé

The present invention relates to a front-end extendable pile capable of increasing the allowable bearing capacity of a pile by rapidly enlargedly cutting the ground at the front end of the pile and simultaneously forming a pile expansion part in various stratums using simple equipment without a separate reaming drill. The front-end extendable pile of the present invention comprises: a pile main body; and an enlargement part which is coupled to the lower section of the pile main body and of which the diameter expands when rotating, wherein the enlargement part comprises: an upper guide member which is coupled to the lower section of the pile main body; a lower guide member which is provided at the lower section of the upper guide member so as to be spaced apart from the upper guide member at certain intervals; a cylindrical connection member which connects the centers of the upper guide member and the lower guide member to each other and has a plurality of entry and exit holes formed on the outer circumferential surface thereof; and a plurality of extension bodies which are installed between the upper guide member and the lower guide member at the outside of the connection member and comprise: arc-shaped blade portions having cutting tips coupled to the outsides thereof; and pressurizing portions which are provided at the rear ends of the blade portions and are inserted in the entry and exit holes of the connection member.

Classes IPC  ?

• E02D 5/54 - Pieux ayant des supports ou des éléments d'ancrage préfabriquésPieux d'ancrage

Abrégé

The present invention relates to a front-end extendable pile and a construction method therefor, the front-end extendable pile capable of increasing the allowable bearing capacity of a pile by rapidly enlargedly cutting the ground at the front end of the pile and simultaneously forming a pile expansion part in various stratums using simple equipment without a separate reaming drill. The front-end extendable pile of the present invention is installed in a perforated hole formed under the ground and comprises: a pile main body; and an enlargement part which is coupled to the lower section of the pile main body and of which the diameter expands when rotating, wherein the enlargement part comprises: an upper guide member which is coupled to the lower section of the pile main body; a lower guide member which is provided at the lower section of the upper guide member so as to be spaced apart from the upper guide member at certain intervals; a cylindrical connection member which connects the centers of the upper guide member and the lower guide member to each other and has a plurality of entry and exit holes formed on the outer circumferential surface thereof; and a plurality of extension bodies which are installed between the upper guide member and the lower guide member at the outside of the connection member and comprise: arc-shaped blade portions having cutting tips coupled to the outsides thereof; and pressurizing portions which are provided at the rear ends of the blade portions and are inserted in the entry and exit holes of the connection member.

Classes IPC  ?

• E02D 5/54 - Pieux ayant des supports ou des éléments d'ancrage préfabriquésPieux d'ancrage
• E02D 5/44 - Pieux en béton ou analogue coulés en place par utilisation de tubages ou autres coffrages ayant une base élargie ou des élargissements au bas du pieu

Abrégé

The present invention relates to a self-diameter-enlarging pile and a method for constructing same, the self-diameter-enlarging pile allowing the formation of an enlarged pile part and diameter enlargement/cutting by itself without a diameter-enlarging drill and allowing the formation of the enlarged pile part in a desired size in solid rock layers as well as earth and sand layers, thereby reliably improving bearing capacity. The self-diameter-enlarging pile according to the present invention comprises: a main pile body installed underground; a diameter-enlarging implement, which is coupled to the bottom of the main pile body, and the diameter of which enlarges as the diameter-enlarging implement is rotated with the rotation of the main pile body; and a pressurizing member for enlarging the diameter of the diameter-enlarging implement. The diameter-enlarging implement comprises: a main diameter-enlarging implement body, which has a pressurizing member accommodation space formed therein, a blade accommodation space formed along the outer circumferential surface on the side thereof, and a plurality of guide holes formed to communicate with the pressurizing member and blade accommodation spaces and is in a circular cylinder shape; and an enlarging member comprising blades, which are accommodated in the blade accommodation space, have cutting tips coupled to the outer side thereof, and are in an arc shape, and pressurizing parts, which protrude from the rear ends of the blades and have ends thereof positioned in the pressurizing member accommodation space through the guide holes, wherein the pressurizing member pressurizes the ends of the pressurizing parts in the pressurizing member accommodation space, so that the enlarging member radially slides outside the main diameter-enlarging implement body, thereby enlarging the diameter of the diameter-enlarging implement.

Classes IPC  ?

• E02D 5/54 - Pieux ayant des supports ou des éléments d'ancrage préfabriquésPieux d'ancrage
• E02D 5/74 - Moyens d'ancrage d'éléments de structure ou de rideaux de palplanches
• E02D 7/20 - Mise en place par pression ou traction

Abrégé

The present invention relates to a front-end-enlargeable pile and a method for constructing same, the front-end-enlargeable pile being capable of forming an enlarged pile part while swiftly cutting in a diameter-enlarging manner the ground around the front end of the pile in various strata by using simple equipment without a separate hole-enlarging drill, thereby significantly increasing the allowable bearing capacity of the pile. The front-end-enlargeable pile according to the present invention comprises: a main pile body; and a diameter-enlarging implement, which is coupled to the bottom of the main pile body, and the diameter of which is enlarged by a pressurizing member as the diameter-enlarging implement is rotated with the rotation of the main pile body, wherein the diameter-enlarging implement comprises: a base member; a guide tube, which integrally protrudes from the central upper surface of the base member, and the upper part of which is open so that the pressurizing member can enter therefrom, and which has a plurality of entry/exit holes formed on the outer circumferential surface thereof; a coupling member for fixing/coupling the guide tube inside the main pile body; and an enlarging member comprising blades, which are provided between the base member and the bottom of the main pile body and have cutting implements formed on the outer sides thereof, and pressurizing parts, which are provided at the rear ends of the blades, have one end positioned inside the guide tube through the entry/exit holes of the guide tube, and slide outside the guide tube by the pressurization of the pressurizing member, thereby enlarging the blades outward.

Classes IPC  ?

• E02D 5/44 - Pieux en béton ou analogue coulés en place par utilisation de tubages ou autres coffrages ayant une base élargie ou des élargissements au bas du pieu
• E02D 7/00 - Procédés ou appareils pour la mise en place de rideaux de palplanches, de pieux, de tubages ou d'autres coffrages

Abrégé

The present invention concerns: a construction method for the reinforcement of pile foundation ground by using a tip-diameter-expanding pile, whereby it is possible to reinforce the foundation ground of the pile by rotating and cutting and at the same time expanding an expanding element at the bottom of the main pile body, such that the diameter-expanding apparatus seals off the space between the diametrically outer pile part and the ground inner wall so as to prevent the rising of underlying slime and also ensure support against the unworked ground on the outside of the borehole such that the density of the surrounding ground is substantially increased; and a diameter-expanding apparatus for the tip-diameter-expanding pile. The construction method for the reinforcement of pile foundation ground by using a tip-diameter-expanding pile of the present invention involves the use of a tip-diameter-expanding pile incorporating a main pile body of which the inside is shaped as an empty tube and incorporating a diameter-expanding apparatus of which the diameter expands and which couples to the bottom part of the main pile body, and the construction method of the present invention comprises: (a) a step in which the tip-diameter-expanding pile is driven into the ground; and (b) a step of sealing off all or part of the space between the ground inner wall and the diametrically outer pile part by means of expansion of the expanding element by pressurising the rear end of a pressurised part of the expanding element by inserting a pressurising element, which has a conical rear end, through an upper through-hole of the diameter-expanding apparatus and into a linking member while at the same time rotating the expanding element of the diameter-expanding apparatus, centred on the central axis of the pile.

Classes IPC  ?

• E02D 5/72 - Sabots de pieux

Abrégé

The present invention relates to a drill bit for ground excavation that is configured to use a liquid supplied from the outside in order to discharge excavated slime to the outside of the bored hole. The drill bit (2) includes an upwardly discharging passage (14) that changes the direction of flow of a downwardly supplied fluid for discharging slime to an upward direction so as to be discharged. Slime on the sides of drill bits (2), (2a), and (2b) and a drill rod is quickly removed so that friction against the walls of a bored hole during rotation is reduced in order to improve drilling speed. The supporting ability of a structure is improved because there is no residual slime left on the floor of a bored hole, and slime deposited on a drill rod or a screw (8) attached to the drill rod is mostly removed so that there is almost no slime to be shaken off above ground, thereby reducing civil complaints due to falling rocks and scattering dust.

Classes IPC  ?

• E21B 10/60 - Trépans caractérisés par des canaux ou des buses pour les fluides de forage
• E21B 37/00 - Procédés ou appareils pour nettoyer les trous de forage ou les puits

Abrégé

The present invention relates to a pile provided to an underground penetration hole of which direct-boring is finished, wherein an enlargement member (102) is provided to enable formation of a pile enlargement part at a portion of a pile main body (100) and comprises a cutting tool (10) for enlargement and cutting and a radial enlargement carrier (12) radially enlarged by the pressure of curable joining fillers (14, 14a). Therefore, the pile is self-enlargeable by forming the pile enlargement part by the cutting tool (10) and the radial enlargement carrier (12) which are in an enlarged state. In addition, by using the self-enlargeable pile of the present invention, the pile enlargement part can be constructed according to the standards which were designed in advance regardless of the strata such as very solid earth and sand layers or bedrock layers without any additional enlargement tool.

Classes IPC  ?

• E02D 5/44 - Pieux en béton ou analogue coulés en place par utilisation de tubages ou autres coffrages ayant une base élargie ou des élargissements au bas du pieu
• E21B 7/28 - Élargissement des trous forés, p. ex. par forage à contresens
• E02D 5/62 - Tassement du sol à la base ou d'un matériau analogue à travers des tubes

Abrégé

The present invention relates to a drill bit capable of preventing the hammer from being inoperative, wherein a drive serve is spline-connected to the main body of the drill bit so as to vertically reciprocate, and the drive serve has an interval of a working space part in which the main body of the drill bit is arranged so as to have an injection hole communicating with a fluid pressure supply passage for discharging slime so that the slime coming into the working space part of the drive serve is removed by the fluid pressure injected through the injection hole, or the main body of the drill bit is provided with an upper injection opening communicating via a connection passage with the fluid pressure supply passage so that the slime interposed between the main body of the drill bit and the wall of a drilled hole is removed by operating a switch by means of the reciprocation of the drive serve, electricity, or fluid pressure so as to open at least one of the upper injection opening and the passage at the discharge side in the fluid pressure supply passage for discharging the slime, or the upper and lower contacting surfaces (40) between the drive serve and the main body of the drill bit are designed to be sloped towards the outside so that pushing the drill bit causes the slime coming into the working space part of the drive serve to be properly discharged.

Classes IPC  ?

• E21B 12/06 - Dispositifs de nettoyage mécaniques
• E21B 12/04 - Protecteurs de trépans

Abrégé

The present invention is to remove most of the residual slime remaining in a drilled hole using a drilling tool itself without adding separate equipment for treating slime during drilling for constructing a pile or a tension member or drilling for installing a horizontal structure, thus not only ensuring economic advantages and shortening a construction period but also improving supporting force of the pile, reducing long-term settlement and improving pull-out resistance of the tension member.

Classes IPC  ?

• E21B 21/06 - Dispositions pour traiter les fluides de forage à l'extérieur du trou de forage
• E21B 12/06 - Dispositifs de nettoyage mécaniques

Abrégé

The present invention relates to a method for pouring a bonding filler after forming a hole portion at a perforation hole which is bored in a depth direction of the ground in order work on an expansion portion at which a pile or a tensile member for construction works is erected. A balloon containing the curable bonding filler is arranged at a leading bottom portion of the pile or tensile member, and the pile or tensile member is lowered down to the bottom of the hole portion. Then, the pile or tensile member is pressed such that the balloon disposed at the bottom portion is compressed in the vertical direction, and expands in the radial direction up to an outline of the hole portion. The bonding filler in the expanded balloon is filled in the hole portion while the dimensions of the hole portion are maintained.

Classes IPC  ?

• E02D 5/54 - Pieux ayant des supports ou des éléments d'ancrage préfabriquésPieux d'ancrage
• E02D 5/62 - Tassement du sol à la base ou d'un matériau analogue à travers des tubes

Abrégé

The present invention relates to a reinforcement structure (16) for a concrete anchorage zone for piles and tension members for building construction, in which an operating rod (24) is arranged so as to be movable in the upward and downward directions through a deep hole of a front reinforcement plate (22) fixed at a front end of a pile or tension member (18), and horizontal extension reinforcement bars (26) hinged along the circumferential surface of the operating rod (24) and extending in the radial direction. The reinforcement structure (16) of the present invention is inserted into a concrete anchorage zone (14) that is not hardened after being placed, and the operating rod (24) operates in the vertical direction so as to enable the horizontal extension reinforcement bars (26) to fully spread in the horizontal direction. Thus, sufficient supporting force or pullout resistance may be ensured, even when relatively fewer or shorter piles or tension members are employed.

Classes IPC  ?

• E02D 5/46 - Pieux en béton ou analogue coulés en place réalisés sur place par injection de liants dans des remblais graveleux ou dans le sol
• E02D 5/62 - Tassement du sol à la base ou d'un matériau analogue à travers des tubes

Abrégé

The present invention relates to a method of concreting an end of a construction pile or tensile member, which includes: a first step of boring a vertical hole in the ground, and installing a tubular casing in the vertical hole to support a hollow wall if necessary; a second step of expanding an end of the vertical hole by using a hollow wall expanding tool so as to form an expanded hole of a pre-designed size, and supporting an upper ground of the expanded hole and a portion of the side wall thereof by using an upper ground support; and a third step of casting concrete within the expanded hole at the end of the vertical hole to form a concrete expansion part of a pre-designed size. Since the concrete expansion part is formed on the end of the construction pile or tensile member, the allowable bearing capacity of the construction pile or the pulling resistance of the tensile member can be significantly improved.

Classes IPC  ?

• E02D 5/48 - Pieux de structure variable le long de leur longueur
• E02D 27/32 - Fondations pour des buts particuliers
• E02D 5/54 - Pieux ayant des supports ou des éléments d'ancrage préfabriquésPieux d'ancrage
• E01D 19/02 - PilesCulées

Abrégé

The present invention relates to a borehole-diameter-expanding drill which is used in order to expand the hole wall in part of a borehole shaft drilled in the ground for the purpose of building work, wherein there is a sliding blade assembly which comprises sliding blades capable of mutual folding, hinged to the shaft part of a rotor at the upper end thereof, and each of the sliding blades has secured to the upper surface thereof cutting bits for hole-wall cutting, and there is a movable member for controlling the upwards unfolding and the downwards folding of the sliding blades, and thus it is possible to subject part of the borehole shaft to reaming in the ground while maintaining the shape of the reamed area in the ground unaltered, and it is possible to form the securing and fixing part of an anchor or tension pile or else to form the spread foundation part at the front end of a compression pile by casting concrete into the reamed area.

Classes IPC  ?

• E21B 7/28 - Élargissement des trous forés, p. ex. par forage à contresens
• E02D 5/34 - Pieux en béton ou analogue coulés en place

Abrégé

The present invention relates to a method for constructing a footing at the bottom of a pile and a fixed anchorage portion of a tension member, in which: a vertical hole is bored into the ground, and then a tool for expanding the borehole wall is disposed within the bottom of the hole; the tool is driven to expand the bottom of the hole and form an expanded portion, and simultaneously, a portion of the ground on the upper side of the expanded portion is supported by means of the tool; concrete for a footing or a fixed anchorage portion is passed through the tool to fill the expanded portion of the hole with the concrete; and the tool is gradually contracted to form a space that is filled with the concrete, thereby finally casting the concrete into the footing or the fixed anchorage portion at the bottom of the pile.

Classes IPC  ?

• E02D 7/00 - Procédés ou appareils pour la mise en place de rideaux de palplanches, de pieux, de tubages ou d'autres coffrages
• E21B 10/26 - Trépans avec une partie pilote, c.-à-d. trépans comportant un organe coupant piloteTrépans pour élargir le trou de forage, p. ex. alésoirs
• E02D 5/62 - Tassement du sol à la base ou d'un matériau analogue à travers des tubes