Improvements relating to Screw-anchors or Screw-piles and Tension- wires for Staying and Anchoring Structures in position.
Year: 1898

page_text: Date of Application, 14th Feb., 1898-Accepted, 9th Apr., 1898
COMPLETE SPECIFICATION.
Improvements relating to Screw-anchors or Screw-piles and Tension-
wires for Staying and Anchoring Structures in position.
I, HERMANN BUECKING, of 16, Schonhausenstrasse, Bremen, in the German
Empire, Government Surveyor of Buildings, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:
This invention relates to a screw-anchor or screw-pile which is primarily
intended for use in hydraulic, engineering, and is designed to replace piles which
are required to resist a pull. Also in cases where beds of sand, for example, have
become so consolidated and hard by the motion of the waves that they cannot
generally be penetrated by piles, the new screw-anchor can be advantageously
employed.
The accompanying drawing shows various forms of my improved screw-anchor.
A screw-shaped anchor-plate or pile a, together with tension-wires b, b secured
thereto, or other arrangements for transmitting a pull, is screwed into the resisting
material, for example, the ground, simultaneously with the wires bb, by means of
a key c which is formed at its lower end with a screw-way corresponding to the
pitch of the screw surface a, or is of other suitable form for the purpose in view.
The tension-members acting on the anchor-plate a are either arranged around a
specially shaped pin or wedge d, or are drawn through the same and passed upwards
through the key. The wires can, however, also be secured directly to the surface
of the screw-anchor, if a piece e of the sheet-metal thereof is bent up and formed
with a hole, Figures 5, 6 and 8.
After the key, with the screw-shaped anchor-plate and the tension-members, is
screwed sufficiently deeply into the ground, the key is turned in an opposite
direction to that taken in screwing it in, and then withdrawn; the screw-shaped
anchor-plate a, with the pin or wedge d holding the tension-members, then
remains, or if the tension-members are directly attached to the anchor-plate, they
rest therewith in the ground. As soon as the tension-members are pulled, the pin
or wedge rests against the anchor-plate and the pull exerted on the wires is thereby
transmitted to the anchor-plate. When the wires are drawn through the sheet-
metal lug e, the pull exerted thereon acts directly on the anchor-plate. The
screwing-in can take place in any desired direction or at any angle to the hori-
zontal. Also any desired number of wires can be connected to the anchor-plate.
The surface of the anchor-plate can be made in the form of any desired regular or
irregular figure.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
A screw-anchor or screw-pile with tension-members secured thereto and a remov-
able key serving for screwing the anchor into the ground, characterized in that the
tension-member secured to the screw-shaped upwardly-bent anchor-plate is passed

page_text: through the hollow shaft of the key and is thus protected against twisting or
distortion, substantially as herein before described.
D. YOUNG & Co.,
11 and 12, Southampton Buildings, London, W.C.,
Agents for the Applicant.