Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1993-11-19
1995-12-19
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Chemical
405303, 4051501, E02D 300, E21D 1110
Patent
active
054763444
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a means for injecting concrete, plastic or the like into cracks in a concrete structure, a rock face end the like. The injection means comprises an elastic, radially expandable and substantially tubular body adapted to be securely and sealingly engaged with a bore hole for the cracks; a first end portion with a non-return valve means to be introduced deepest into the bore hole; and a second end portion adapted to be connected to a feeding pipe for the compound to be injected.
SE Printed Application 413,929 and GB-A-2,102,860 disclose injection means of the above features. These means are fixed in bore holes by means of key joints, the displacement of the first end portion with the non-return valve means towards the second end portion in relation to the tubular body causing the latter to expand into engagement with the bore hole, owing to the keying action between said body and the first end portion. Thus, the gripping power of the injection means is totally unrelated to the pressure of the injection compound. Further, these prior art means comprise several separate details which have to be assembled before use, for which reason these means are both complicated end expensive to manufacture. Owing to their construction and function, the injection means take time to handle, since they first must be anchored in the holes by the application of a pulling force on a detail thereof, and it is only after this operation that the compound can be injected. Also, it cannot be guaranteed that the gripping power of the prior art means is sufficient to keep said means in place in the holes when the compound is injected into the holes and the cracks under high pressure.
One object of the present invention is to provide an injection means which is securely held in place when the compound is injected.
Another object of the invention is to provide an injection means which is made in one piece and has no moving parts except in the non-return valve.
Yet another object of the invention is to provide a means which is not only simple and inexpensive to manufacture, but also uncomplicated, time-saving and reliable in operation.
A further object of the invention is to provide a disposable injection means enabling the feeding pipe with associated end portion to be easily separated from the remainder of the injection means when injection has been completed.
According to the invention, these objects are achieved by an injection means of the above type, which is characterised in that the elastic body, the first end portion and the second end portion are formed as an integrated unit, and that the elastic body is adapted to expand into engagement with the bore hole before the non-return valve means at a given pressure opens to inject said compound into the hole.
Further developments of the invention are apparent from the distinctive features recited in the appended claims.
The injection means according to the invention will be described in more detail below in connection with the injection of liquid injection compound, such as epoxy plastic, cement grout with or without swelling agent, polyurethane and the like, into cracks in concrete structures or rock faces to seal these cracks. The injection means may, however, also be used when an upper concrete has detached itself from a concrete slab, to fill the void. Further, the injection means can be used for contact injection to prevent vibrations between different elements, such as concrete beds and machine parts, the cavities therebetween being filled with epoxy plastic or cement.
By way of examples, preferred embodiments of the invention will now described in more detail, reference being had to the accompanying drawing, in which
FIG. 1 is a longitudinal section of the inventive injection means which has been introduced in a bore hole in a concrete structure with cracks to seal the structure,
FIG. 2 is a longitudinal section of an alternative embodiment of the injection means especially suited for injecting a plastic composition,
FIG. 3 is a longitudinal sectio
REFERENCES:
patent: 2960831 (1960-11-01), Lonaberger et al.
patent: 3260053 (1966-07-01), Miller
patent: 4362440 (1982-12-01), Glaesmann et al.
patent: 4461600 (1984-07-01), Norkus et al.
patent: 4710063 (1987-12-01), Faktus et al.
Corbin David H.
Sundsvalls Manchetten AB
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