Pipes and tubular conduits – Structure
Patent
1996-05-16
2000-04-04
Brinson, Patrick
Pipes and tubular conduits
Structure
138123, 138125, 138103, 239145, F16L 900
Patent
active
060448695
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
An injection tube for construction joints on concrete buildings is known from DE-U 8,425,518, having an essentially cylindrical wall which is permeable to liquid and is made of flexible material, such as rubber or plastic, in which the wall has a slot, extending over its length, for the outlet of the injection liquid, the wall in the region of the slot has a depression, extending axially likewise over the length of the wall, for receiving a strip which covers the slot and is made of a material which is compressible under the pressure of the injection liquid, and in which the wall with the strip is enclosed by a tube of material which is permeable to liquid. Such an injection tube has disadvantages in terms of manufacture and, owing to the relatively narrow outlet slot compared to the width of the depression, relatively high compression forces are required without being able to achieve a reliably uniform distribution of the injection liquid over the circumference of the injection tube.
These disadvantages are avoided to a great extent in the injection tube known from DE-A 3,512,470, in that a plurality of radial openings in the basic body and the assigned depressions and strips are distributed over the circumference of the basic body with angular symmetry in relation to the longitudinal mid-axis. However, this requires greater production expenditure.
SUMMARY OF THE INVENTION
The object of the invention is to propose an injection tube of the type mentioned at the beginning, which, with simple manufacture and relatively low compression forces, allows a uniform distribution of the injection liquid over the circumference of the injection tube so that construction joints can be grouped reliably, even using cement.
This object is achieved according to the invention by the characterizing features of claim 1 or claim 3.
With the aid of both solutions, the production of the injection tube is simplified since only a single depression has to be provided in the casing surface of the basic body, on the other hand the disadvantages of a continuous slot in the basic body are avoided because radial passage openings distributed over the length of the basic body are provided, and an exceptionally uniform distribution of the injection liquid over the circumference of the injection tube is surprisingly achieved either due to the helical shape of the depression or the relatively large width of the depression, so that construction joints can be sealed off with greater reliability. Particularly if the relatively wide depression runs axially parallel to the passage channel, to use less material provision may be made for the passage channel to be arranged eccentrically in the cylindrical basic body.
It is particularly advantageous if the covering consists of a large-mesh, low-stretch fabric which tightly surrounds the casing surface of the basic body and the outer surface of the strip because, in this way, the injection tube does not undergo any circumferential widening at all during compression of the injection liquid, but only an internal valve effect occurs due to the squeezing of the strip material. This is because the strip, which closes the openings in the groove-shaped depression when there is an external pressure, for example the pressure of the concrete, specifically all the better, the greater the external pressure is, is compressed from the inside under the compression force in such a way that the injection liquid can easily emerge. In this case, owing to the low-stretch fabric, the injection tube cannot change its cross-section, which could otherwise lead to incomplete sealing of the construction joint.
In terms of manufacture, it is advantageous if the strip is bonded under prestress into the depression.
Within the scope of the invention, the lateral boundary flanks of the depression and of the strip can advantageously taper obliquely towards one another from radially outside to radially inside in a manner known per se. In this case, a particularly favourable opening cross-section result
REFERENCES:
patent: 2994482 (1961-08-01), Valois et al.
patent: 3946762 (1976-03-01), Green
patent: 4061272 (1977-12-01), Winston
patent: 4153080 (1979-05-01), Murray, Jr. et al.
patent: 4581137 (1986-04-01), Edwards et al.
patent: 4722479 (1988-02-01), Koob
patent: 5660209 (1997-08-01), Franz et al.
German Search Report dated Aug. 2, 1994.
BBZ Injektions- und Abdichtungstechnik GmbH
Brinson Patrick
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