Static structures (e.g. – buildings) – With piercing or expanding earth anchor – Auger-type penetrator
Patent
1998-02-02
1999-08-03
Friedman, Carl D.
Static structures (e.g., buildings)
With piercing or expanding earth anchor
Auger-type penetrator
52148, E02D 580
Patent
active
059309598
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a ground anchor device and method for introducing a ground anchor into the ground. These types of devices and methods have been used, for example, for the stabilizing of permanent and temporary sheet-pile walls, wherein such walls have been set into the ground with the anchors being at a predetermined distance away from the walls.
BACKGROUND OF THE INVENTION
U.S. Pat. No. 2,603,319 discloses a method of introducing a ground anchor into the ground, comprising the step of screwing an elongated anchor body into the ground by rotating an extension tube that is connected with its distal end to the proximal end of the anchor body.
In a frequently and successfully applied embodiment of the well-known method, an anchor body having a hollow core and screw blades is used to secure a structure, such as an aggregate of building materials, e.g., sheet-piles. After this anchor body has been screwed into the ground, a setable mortar is introduced. The mortar is forced through the extension tube and the hollow space of the anchor body into the ground. i.e., the earth, between the screw blade windings to form, together with said earth, a solid mass. Thus, the anchor body becomes fixedly anchored.
The extension tubes form a permanent part of the anchor and are attached to the sheet-pile wall, with the proximal end of the uppermost extension tube extending through a hole in the sheet-pile wall and through a corresponding hole in an anchoring support member that is provided on the outer side of the sheet-pile wall.
In general, the insertion of the ground anchors into the ground is started only after the sheet-pile wall is completed because the introduction of the individual sheet-piles involves powerful vibrations, which are transmitted through the earth. If one were to start the introduction of the ground anchors, while continuously driving additional sheet-piles into the ground, these vibrations would prevent an effective setting process of the setable mortar, so that the required pull out load resistance would not be obtained.
SUMMARY OF THE INVENTION
It is an object of the invention to improve the well-known method in the sense, that the introduction of the ground anchors may begin before the structure to be stabilized (i.e. sheet-pile wall) has been completed, and if desired, immediately upon the introduction of each next sheet-pile or group of sheet-piles, so that the overall time required for driving constructions, such as sheet-pile walls, into the ground and anchoring the same, may be substantially reduced.
According to the invention, this aim is achieved in that the distal end of a line of sufficient tensile strength is connected to the anchor body at a location that is positioned between the two ends of the anchor body and excentrically, relative to the cross section of the anchor body. The tension line extends outwardly through the connected extension tube, wherein the extension tube being unscrewed from the anchor body after it has arrived at a predetermined depth. Such depth is that 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. A pulling load is subsequently applied to the free proximal end of tension, while line remaining connected to the anchor body. The intensity of the pulling load being such that it causes the anchor body to perform a turning movement through the ground about the attachment point of said line, after which movement the proximal end of said line is attached to the structure to be stabilized.
By causing the anchor body to turn under the influence of the pull load exerted at the proximal end of the line, the axis of the anchor body will become positioned at an angle relative to the line, so that its resistance to being pulled out increases. The ultimate resistance to the pulling out of the anchor body will be higher according to
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A Phi Dieu Tran
Bednarek Michael D.
Friedman Carl D.
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