Method for applying a ground anchor into the ground and anchor t

Hydraulic and earth engineering – Foundation – Columnar structure

Patent

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Details

405244, 405262, 405241, 52157, 52153, E02D 510, E02D 574

Patent

active

059279052

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to the field of ground anchors that are capable of balancing the forces to which building structures are subjected. For example, sheet pile walls, which are driven into the ground at building sites, need to be stabilized by ground anchors, which are capable of generating pulling forces that are large enough to compensate for lateral ground pressure exerted on the sheet pile wall.


BACKGROUND OF THE INVENTION

According to well-known methods, an anchor is inserted in the ground by making use of an anchor body having a hollow core and screw blades, which is screwed into the ground with the aid of one or more extension tubes. The extension tube is connected to the proximal end of the anchor body and rotated until the anchor body has reached a desired depth. A settable mortar is then introduced and forced through the extension tube(s) and through the hollow space of the anchor body into the soil between the screw blade turns, so as to form, together with the soil, a solid mass, in which the anchor body becomes fixedly anchored.
The extension tubes form a permanent part of the anchor and are attached to the structure to be stabilized, e.g., a sheet-pile wall, with the proximal end extending through a hole in the sheet-pile wall, thus becoming the intermediary of an anchoring support.
In general, the insertion of the required ground anchors into the ground is started only after the sheet-pile wall is completed. The introduction of the individual sheet-piles involves powerful vibrations, which are transmitted through the earth. If one were to start the insertion of the ground anchors, while continuously driving additional sheet-piles into the ground, the vibrations would prevent an effective setting process for the settable mortar, thus the required pull out resistance would not be obtained.


SUMMARY OF THE INVENTION

It is an object if the invention to provide an improved method of inserting a ground anchor into the ground. A further object of the invention is to provide such an insertion method that can be carried out before a structure, e.g., sheet pile, to be stabilized, has been completed and immediately upon the insertion of each subsequent sheet-pile(s), so that the overall time required for inserting structures into the ground and anchoring the same, may be substantially reduced.
The invention provides a method for inserting a ground anchor into the ground, comprising the step of screwing an elongated anchor body into the ground by making use of an extension tube that is connected to the proximal end of the anchor body and then rotated until the anchor body has reached a predetermined depth. A predetermined depth is such depth which is commonly recognized within the field of invention as that which would ensure the stability of the structure being stabilized, i.e., the depth at which a pulling load would be below that which would be necessary to completely pull out the ground anchor.
Also included in the present invention are the additional steps of connecting one end of a tension line to the anchor body at a location spaced above the screw blade turns of the anchor body, sliding a pipe sleeve over the extension tube, while threading the line through an eyelet that is fixed adjacent the distal end of the pipe sleeve and guiding the line along the pipe sleeve, rotating the extension tube and the pipe sleeve jointly until the anchor body has reached a desired depth. Subsequently, the extension tube should be immobilized to prevent further rotation of the same while continuing rotation of the pipe sleeve so as to cause the line to be gradually led out through the pipe sleeve downwardly and wind itself into a coil on the proximal end portion and/or the distal end portion of the extension tube.
Through the coil formed on the proximal end portion of the anchor body and/or the distal end portion of the extension tube connected thereto, an increase is effected of both the mass and the diameter of the anchor body, which results in a correspondingly increased "hold" o

REFERENCES:
patent: 2603319 (1952-07-01), Dyche
patent: 3628337 (1971-12-01), Stepanich
patent: 4611446 (1986-09-01), Beavers et al.
patent: 4727693 (1988-03-01), Rockenfeller et al.
patent: 5322386 (1994-06-01), Trangsrud
patent: 5348424 (1994-09-01), Tateyama et al.

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