Static structures (e.g. – buildings) – Assembled in situ-type anchor or tie – Socket type
Patent
1980-01-30
1985-07-16
Murtagh, John E.
Static structures (e.g., buildings)
Assembled in situ-type anchor or tie
Socket type
52743, 206219, 405261, E21D 2002
Patent
active
045287929
DESCRIPTION:
BRIEF SUMMARY
This invention concerns anchoring cartridges for use in anchoring an anchor element in a hole in a substrate, the cartridge, as used, containing both a solid component and a liquid component, the components being interactive to form a self-setting coomposition.
OLS No. 2 350 298 describes an anchoring cartridge which comprises an absorbent paper jacket filled with a dry mortar composition which includes a quick-setting agent for the mortar. In use, the cartridge is first immersed in a container filled with water so that the water soaks through the absorbent paper jacket and moistens the mortar composition. The cartridge is then removed from the water and rammed up a blind hole. This process is repeated using additional cartridges until the hole is substantially filled. A specially designed anchor bolt is then pushed with rotation into the hole, the bolt being rotated to mix the quick-setting mortar and to prevent the mortar from flowing out of the hole. There are several technical problems with this known cartridge. One problem is that the strength of the paper jacket is considerably reduced when the cartridge is immersed in water. This limits the length of the cartridge to about 1 meter, since it is difficult to handle the cartridge without the jacket disintegrating. In addition a specialised anchor bolt is required.
It is an object of this invention to provide an anchoring cartridge of the general type described, which may be used with greater convenience and efficiency.
According to the invention there is provided an anchoring cartridge for use in anchoring an anchor element in a hole in a substrate by means of a self-setting composition comprising interactive solid and liquid components, the cartridge comprising a container housing the solid component of the self-setting composition, the container being formed of a material which does not absorb the liquid component of the composition, the container having a plurality of holes whereby when the cartridge is immersed in the liquid component the liquid passes through the holes into the container there to interact with the solid component to form the self-setting composition, and including means to reduce loss of the self-setting composition via the holes when the cartridge is immersed in the liquid component.
Preferably the solid component is a hydraulically setting material such as a hydraulic cement, a plaster such as stucco, gypsum or dolomite plaster, lime or anhydrite, and the liquid component is water. The solid component may be mixed with a liquid which is non-reactive with the solid, to form a water-miscible slurry, although best results will usually be achieved if the solid component is dry. The invention is not limited to the use of hydraulically setting materials and the use of solids which react with other liquids is possible, for example resin-based solids.
The means to reduce loss of the self-setting composition from the cartridge may be chemical or mechanical means or both. An especially preferred means is a thixotropic agent for the self-setting composition. The amount of thixotropic agent present may range from 0.0001% to 5% of the total weight of the solid component. Preferred is from 0.001% to 1% of the total weight of the solid component. Many thixotropic agents are suitable for use with the invention. Examples of suitable thixotropic agents are sodium carboxymethyl cellulose, high molecular weight polymer oxides such as polyethylene oxide or polypropylene oxide, and high molecular weight glycols. Polyacrylamide is an especially preferred thixotropic agent because of its low cost and low toxicity.
The solid component will usually include a plasticiser for the self-setting composition. Examples of suitable plasticisers are sulphonated melamine/formaldehyde condensates, condensation products of .beta.-naphthalene sulphonic acid/formalin, nonionic surfactants, and lignin dispersing agents such as calcium lignosulphonate.
It will be appreciated that although it is preferable for the thixotropic agent and/or the plasticiser to be included i
REFERENCES:
patent: 3921800 (1975-11-01), Burns
patent: 3925996 (1975-12-01), Wiggill
patent: 3955992 (1976-05-01), Roberts
patent: 4126005 (1978-11-01), Coursen
patent: 4157116 (1979-06-01), Coulter
"La Technique Moderne" vol. XLVIII, No. 9, 9/6/56 (La Technique Moderne; Paris, France) W. DeWetlinsky, Les Soulons Plafonniers, see p. 469, right hand column, FIG. 10.
Cranko Ernest
Cross Robert C.
Dransfield Michael J.
Murtagh John E.
Rudy Andrew J.
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