Static structures (e.g. – buildings) – Relatively yieldable preformed separator – Separator inserted prior to or during pouring of two...
Patent
1997-08-27
2000-02-22
Smith, Creighton
Static structures (e.g., buildings)
Relatively yieldable preformed separator
Separator inserted prior to or during pouring of two...
527317, E04B 1682
Patent
active
060266228
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a predetermined crack joint rail.
When concreting elongated continuous wall sections, cracks occur due to the shrinkage of the concrete, which cracks can result in leakage of the wall. Therefore, in particular in the case of walls against which water stands, at particular points predetermined cracks are produced by introducing elements, which reduce the wall cross-section. These cracks are sealed off by crack producing elements, so that the tightness of the wall is ensured.
In conventional manner joint sealing tubes are used for producing such predetermined crack joints, which tubes consist of a tubular shaped joint strip and a hard PVC stiffening tube.
The cross-section of the wall is positively weakened by mounting the joint sealing tube in the center of a wall and by simultaneous application of triangular strips on the inner and outside. Thereby the shrinkage cracks are localized and are sealed off by way of the joint strip.
In doing so the tubular shaped joint strip is welded to a joint strip extending horizontally in the transition of the floor slab to the wall so that a water impervious elastic layer is created.
In this type of joint sealing tube it is disadvantageous that the joint sealing tube is not placed on the surface of the floor slab on which the wall is concreted because otherwise the water can penetrate in longitudinal direction of the joint sealing space.
Furthermore, predetermined crack joint rails are known which are constituted by plate shaped hollow or solid elements with several chambers extending in longitudinal direction. These rails have a particular thickness in order to take up a swelling strip in a groove along a longitudinal narrow side. The swelling strip is applied also at the narrow side of the rail resting on the floor in order to create reliably a seal in the joint between the floor slab and the wall to be concreted. The swelling sealing strip provided at the layer narrow side of the rail is to be joined furthermore in longitudinal direction of the joint between the floor slab and the swelling sealing strips extending to the wall to be concreted whereby a conventional seal of the overall joint strip region is achieved by means of the swelling strip.
The rails with hollow chambers used for this purpose are made of plastics material. Furthermore, either very thick swelling strips are to be used in order to ensure a reliable sealing, which in turn increases the cost of the predetermined crack joint rail, or only a limited sealing effect is allowed, which is not sufficient at localized high water pressures. A subsequent sealing off of such predetermined crack joints sealed off with swelling strips can be executed either only from the outside or it is extremely costly if subsequent sealing is to be performed at the rail. The concrete wall then has to be broken open or it can be sealed off locally by way of an outwardly applied but very expensive point injection process.
The swelling strip used thereby swells under water influence. The swelling agent is a hydrophilic mass, which is embedded in a carrier material, mostly chloroprene rubber. The carrier material in particular has the object to provide stability and elasticity to the swelling agent. The hydrophilic (water sucking) components absorb water molecules and thereby increase its volume for 1.5 to about 4 times. Thereby a pressure of up to 6.5 bar is created, which fills the surrounding hollow spaces and is supposed to make these spaces water impervious. When using such swelling agents care has to be taken that they do not expand suddenly but expand slowly over hours or days and consequently can only be used to a limited extent in regions alternating with wet and dry periods. A clear advantage of swelling agents, this being the reason why they are often applied, is in the possibility to seal off joints between different materials reliably, as for example concrete/plastics material, concrete/iron etc.
Furthermore, sealing arrangements for sealing a joint existing between two concrete sections are kn
REFERENCES:
patent: 3903587 (1975-09-01), Borardi
patent: 4128358 (1978-12-01), Compton
patent: 4964256 (1990-10-01), McCracken
patent: 5339590 (1994-08-01), Kangas
patent: 5473848 (1995-12-01), Kangas
Rascor Spezialbau GmbH
Smith Creighton
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