Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent
1996-06-04
1998-03-10
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Shoring, bracing, or cave-in prevention
248357, 405283, E02D 500
Patent
active
057253307
DESCRIPTION:
BRIEF SUMMARY
JOINING ARRANGEMENT
The invention relates to a joining arrangement in accordance with the preamble of claim 1.
A joining arrangement between a guide profile, which is U-shaped in cross section, of a lining element (support or sheeting plate) and a spreader which is held, pivotable around a pivot shaft extending transversely to its longitudinal axis, by means of a support shoe in the guide profile, is known from DE 22 58 588 C1. In this case the support shoe consists of an elongated support plate, whose longitudinal axis is disposed parallel with the longitudinal axis of the guide profile and can be tilted into the guide profile, a receiver for the spreader, disposed on its top, and a drilled-through cylinder piece disposed axially, i.e. transversely to the longitudinal axis of the guide profile, on the underside of the support plate.
In the known reference compression springs are disposed on the underside of the support plate on both sides of the cylinder piece, which during operation are alternatingly pressed against the bottom of the guide profile or the lining element. It is possible in this manner to elastically absorb tilt movements of the spreaders during the alternating lowering (during installation) or lifting (during retreating) of the lining elements. An essential disadvantage of the known arrangement consists in that the springs cannot assure stabilization of the respective spreaders or their fastening in a direction obliquely to the elastically sprung pivot movement, so that undesired tilt movements within the naturally high tolerances in below grade construction--in particular those of the drilled cylinder pieces--cannot be prevented.
With correspondingly high loads, which can always occur in canal construction, it is therefore possible that deformations past the tolerances can occur, both in the joining arrangement as well as the spreaders and in the spindle disposed therein. Furthermore the previous joining arrangements cannot stabilize a pre-assembled lining box in such a way that the box would be standing straight at the site.
In accordance with DE 39 09 110 C2 it is possible in connection with an arrangement in accordance with the above mentioned DE 22 58 588 C1 to embody the guide profile as a box with a U-profile, wherein a bore, which is aligned with the bore of the cylinder piece, leads approximately through the center of the U-shaped legs of the U-profile, and wherein one pair of compression springs each is to be releasably disposed in the guide profile on both sides of the cylinder piece. In this case the tilting moments of the spreader in the direction crosswise to the intended pivot movement cannot be easily controlled.
To address these problems, a joining arrangement is proposed in DE 42 09 675 C1 wherein the support plate on which the spreaders are located is applied between respectively two pairs of extension and compression springs (on both sides of the receptacle). This arrangement is of such a height that its mounting absolutely requires a slit in the respective lining element. A further disadvantage of the known double spring arrangement resides in that the outer springs facing away from the lining element are located on both sides of the receiver for the spreader, so that the latter, if it is deflected too far, bumps against one or the other (outer) spring and can cause damage to the joining arrangement.
It is the object of the invention, based on the joining arrangement in accordance with DE 39 09 110 C2, to improve the device in such a way that simultaneously an increased spring force becomes technically possible, tilting moments of the spreader in the direction transversely to the intended pivot movement can be better absorbed and a flat construction is nevertheless maintained.
The attainment of the object in accordance with the invention will be described in the characterizing part of claim 1. A further development is recited in claim 2.
In accordance with the invention it is provided for the joining arrangement of the type mentioned at the outset that the pair of hel
REFERENCES:
patent: 3881679 (1975-05-01), Krings
patent: 4139324 (1979-02-01), Drings
patent: 5052862 (1991-10-01), Uffmann
patent: 5409192 (1995-04-01), Oliver
Richter Wolfgang
Taylor Dennis L.
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