Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1997-05-02
1999-05-11
Graysay, Tamara L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405283, 405251, 52780, E02D3/02;17/04
Patent
active
059020750
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a trench lining device (lining box) consisting of a base box of lining plates, kept apart by braces, which have a blunt edge, in particular a square pressure cross beam, which is relatively stable against blows of an excavator bucket, on their upper edge, and on the underside of each lining plate a cutting edge for forcing the base box downward into the ground, and with at least one tier of lining plates of a raised box arranged aligned on the base box.
2. Description of the Related Art
A device for shoring trench walls with at least two support walls of wall sections disposed on top of each other is described in DE 20 57 263 C3. The walls are kept at a distance from each other with the aid of cross braces. The lower pair of support walls ("base box" for simplicity) has a cutting edge at the lower edge, which is intended to be driven into the ground, while the upper edge of the plate located opposite the cutting edge is embodied as a blunt edge, for example as a square pressure cross beam. The raised boxes, which are intended to be arranged in tiers above the base box of plates in essentially a vertically aligned manner and which consist of pairs of plates, have a blunt (straight or slightly arched) end profile or the previously mentioned blunt edge, on both the upper and the lower edges. i.e. no cutting edge. The lining plates of the raised boxes essentially differ from the lining plates of the base boxes only by a cutting edge being provided or not. The cutting edge makes it possible to press the base box into the ground. The raised box does not require this cutting edge because it rests on the base box, which has already cut the soil to the width of the trench.
The essential disadvantage when using special raised elements or boxes lies in that they are only used for raising, that is only with relatively deep trenches. The base box is always needed in contrast to this. The raised box only in rare cases, but then at least one raised box is needed for every base box. Therefore the building contractor is required to keep approximately as many raised boxes as base boxed in storage if he is to be prepared to fill orders flexibly, even though the raised boxes are not even required at normal trench depths.
SUMMARY OF THE INVENTION
It is the object of the invention to create a trench lining device which can make do without the raised box which, in accordance with what has been said before, must be considered to be uneconomical, even in those cases where the height of the ground box is insufficient for lining the respective trench because of the required trench depth.
For the trench lining device with at least one tier of raised elements on a base box, the attainment of the object in accordance with the invention consists in that the raised elements of the lining boxes are designed the same as the lining plates of the base box. Connecting means, such as protective rails and/or screw connections, are preferably provided at the joint lines of lining plates placed on top of each other, which prevent the mutual displacement during driving into the ground and possible their separation in the course of the removal of the lined plates.
Thus, in accordance with the invention the trench lining device consists essentially only of the base boxes with connecting plates, which have a cutting edge along one longitudinal side for driving them into the ground. In the course of digging a trench first the base box is driven into the ground with the cutting edge at the bottom. Then a raised box is placed on the base box. The raised box can be alternatively positioned with the cutting edge up or with the cutting edge down. In the later case the cutting edge of the raised box and the top edge of the base box are intended to be connected with the aid of a protective rail, i.e. a connecting element, which protects the cutting edge and prevents the cutting edge from slipping off the top edge of the base box.
If, however, such as is preferred within the fr
REFERENCES:
patent: 2633713 (1953-04-01), Shields
patent: 2657554 (1953-09-01), Davey
patent: 3347049 (1967-10-01), Keine
patent: 3593528 (1971-07-01), Pavese
patent: 4033138 (1977-07-01), Griswold
patent: 4056938 (1977-11-01), Griswold
patent: 4114383 (1978-09-01), Nieber
patent: 4498802 (1985-02-01), Del Tufo et al.
patent: 5180256 (1993-01-01), Krings
patent: 5277522 (1994-01-01), Pertz
patent: 5527137 (1996-06-01), Spencer
patent: 5664382 (1997-09-01), Melnick et al.
patent: 5709058 (1998-01-01), Shaw
Graysay Tamara L.
Lee Jong-Suk
Richter Wolfgang
LandOfFree
Trench falsework system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Trench falsework system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Trench falsework system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-242156