Seal for a joint or juncture – Process of static sealing – Forming in place
Patent
1997-10-17
1999-11-23
Browne, Lynne H.
Seal for a joint or juncture
Process of static sealing
Forming in place
52259, 5239602, 404 64, E04B 1682
Patent
active
059886480
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a sealing device for concrete joints.
The use of sheet-metal strips for the sealing of joints between the abutting ends of two segments to be concreted is known.
These sheet-metal strips are attached with tie wire or similar to the reinforcement set up in the segment to be concreted before the first segment is poured, or are inserted in suitable receiving slots in the reinforcement so that the sheet-metal strip is arranged more or less perpendicular and symmetrical to the abutting ends to be formed. The sheet-metal strip Is then concreted into the segments as they are being poured so that it blocks the joint and prevents the penetration of moisture through the joint.
The sheet-metal strips used normally have a width of 300 mm or more and a thickness of 3 to 4 mm. The individual strips are cut to size in a workshop and preshaped and connected by welding and soldering on site. A strip that has not been properly prepared cannot without further ado be reworked on site so that incorrect preparation of the strips can lead to considerable delay in the pouring of the segments.
The strips are susceptible to rust unless stainless metal is used which does not however bond well with the concrete. For a good bond between the sheet-metal strip and the concrete, use is therefore preferably made of strips with a rust film, because this results in a better bond between the metal and the concrete. However, a rusting strip poses a risk, because it may eventually rust through. Moreover, because of their thickness and width the strips are quite heavy so that for lifting and shifting a strip fabricated for a longer building segment it may be necessary to use a crane. Additionally, sheet-metal strips are only used in the form of plane elements, because a special dimensional shape involves considerable cost.
The strips-connected by welding and soldering are particularly susceptible to rust at their seams with the attendant risk of untightness.
An advantage of the metal strips is that they need not necessarily be Installed before the first concrete is poured, but that they can also be pressed into the still semifluid concrete shortly after the pouring of the first segment. In this case it is however necessary to recompress the concrete near the strip in order to ensure adequate bonding between concrete and strip and hence adequate tightness.
In summary it can therefore be said that although the metal strips can be easily attached to the reinforcement or subsequently pressed into the still semiliquid concrete. they require a good deal of handling for cutting to size, bending and joining and especially because of their corrodibility pose a serious risk of untightness.
Joint tapes of elastomer material are also used for the sealing of a joint between the abutting ends of two segments to be concreted. For effective sealing the cross-section of the joint tapes is formed in accordance with the labyrinth principle, whereby the joint tapes have grooves of trapezoidal or triangular cross-section which lengthen the waterway and at the same time reduce the pressure.
For proper functioning it is essential that the joint tapes are inserted correctly and direct contact with the concrete is necessary. The greatest stress on a joint tape occurs during insertion and every effort must therefore be made at this stage to avoid local excessive stress by stretching, flexure and crushing. Joint tapes must e.g. not be nallecl except for narrow outer edge strips specifically provided for this purpose. Particular attention must be paid that the elastic joint tape shanks do not double up and form pockets in the concrete which are almost impossible to seal later. This may particularly lead to voids, porous spots or grooves which enable the water to by-pass the strip. It is therefore necessary to attach joint tapes at relatively short intervals to the reinforcement in the segments to be concreted so that doubling up can be avoided with certainty. Adequate tightness is only achieved if the joint tapes are embedded in the concrete. The sh
REFERENCES:
patent: Re29777 (1978-09-01), Crowley
patent: 3440934 (1969-04-01), Dill
patent: 4740404 (1988-04-01), Otsugu et al.
patent: 5249401 (1993-10-01), Schmid
patent: 5375386 (1994-12-01), Goad
Greenstreak, Waterstops for Concrete Construction, Sweet's Engineering & Retrofit, vol. 1, McGraw Hill, New York, Section 03250/GRD, pp. 1-12, Mar. 1994.
Sweet's Catalog File, vol. 2, McGraw Hill, New York, sections 3.6/Mur, 3.6/GR, & 3.6/PRP, Jun. 1986.
"Abdichtung von Bauwerksfugen mit Fugenbandern" Dr.-Ing. Norbert Klawa, Bammental TIS Nov. 1984 pp. 662-672.
Agrar Chemie AG
Binda Greg
Browne Lynne H.
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