Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1997-05-08
1998-11-03
Graysay, Tamara L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
405283, E02D 302
Patent
active
058299211
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a lining plate, consisting of profiled sheet metal elements enclosed between two rectangular sheet metal covers and circumferential hollow profiles welded to the sheet metal covers, to be used in connection with trench lining in below-grade construction.
A lining plate with a circumferential hollow profile is described in DE 30 15 110 A1. This lining plate, also provided for shoring up trench walls, has exterior sheet metal plates essentially extending over the entire plate surface, a rectangular frame supporting the edges of the exterior sheet metal plates, and profiles which reinforce the frame and intersect each other. Together with the exterior sheet metal plates, the frame profiles constitute closed hollow box profiles, i.e. a plate frame delimiting the plate body. In detail, the latter can consist of an upper anvil cross piece (pressure cross beam), on which pressure or blows are directed during operation; of lateral closing profiles (vertical cross beams) which can have a rectangular cross section, the same as the anvil profiles; and of a lower pointed or cutting profile of triangular cross section.
In the course of assembling a lining box of two lining plates, generally the one lining plate is placed on the ground, then braces (these are spacers between lining plates standing opposite each other in the trench) are fastened in the plate resting on the ground; the second plate is then lifted over the first plate by a crane and the braces are inserted from below into the second plate and fastened there. During this operation it is necessary for the second plate to be accurately directed by the crane and securely held, so that no accidents can occur. The assembly is furthermore made considerably easier if the plates are hung horizontally, since there will be no jamming when the spindle is inserted. To this end, in actual operations the exterior narrow sides of the two lateral closing profiles of the plate are pulled forward as "free" triangular sheet metal brackets up to approximately the tip of the cutting edge of the lower profile and are equipped with a suspension hole. During horizontal directing the crane can act on the two triangular brackets and further attachment points associated with the upper plate edge, i.e. at four points.
The drilled brackets provided laterally at the longitudinal ends of the cutting edge are generally bent after a short period of use, or even broken off. In actual use the lining plate is therefore held at the cutting edge during assembly in that the crane hooks are simply placed over the cutting edge--without a particular attachment point. Then there is always the danger that one or the other hook slides to the side when the plate is lifted, so that the entire plate begins to tilt.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a fastening possibility as the attachment means for a crane hook, a cable or the like at the pointed or lower edge or cutting edge of the lining plate, in particular for suspending the lining plate in a horizontal position, by means of which neither the driving of the lining plate into the ground is hampered nor the cutting edge of the lining plate, embodied as a hollow profile, is weakened against torsional buckling or the like, and which cannot be damaged, even by driving the lining plate into the ground or pulling the lining plate further along the trench. In addition, the novel fastening or attachment means is intended to permit the direct engagement of a crane hook, similar to the conventional triangular brackets provided on the longitudinal ends of the cutting edge.
The attainment of the object in accordance with the invention lies in that the pointed hollow profile constituting the cutting edge of the lower plate edge contains at least one massive suspension ring made of steel of a cross section which is at least approximately congruent with the triangular cross section of the cutting edge and with a partially straight and otherwise approximately semicircular ex
REFERENCES:
patent: 2886370 (1959-05-01), Liebert
patent: 3347049 (1967-10-01), Faltersack et al.
patent: 3593528 (1971-07-01), Pavese
patent: 4056938 (1977-11-01), Griswold
patent: 4345857 (1982-08-01), Krings
patent: 5277522 (1994-01-01), Pertz
patent: 5503504 (1996-04-01), Hess et al.
Graysay Tamara L.
Lee Jong-Suk
Wolfgang Richter
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