Static structures (e.g. – buildings) – Wall – ceiling – or floor designed for utilities – Load-bearing – prefabricated – abutting units with aligned...
Patent
1986-03-20
1987-12-01
Raduazo, Henry E.
Static structures (e.g., buildings)
Wall, ceiling, or floor designed for utilities
Load-bearing, prefabricated, abutting units with aligned...
52705, 405303, 411 82, 411258, E04B 548
Patent
active
047095210
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The invention relates to a method of inserting a tubular or bar-shaped structural member tightly into a location hole in a construction element as set forth in the introductory clause of claim 1.
The main field of application of the invention is the tight insertion of lead-in wall bushings for cables, pipelines and the like in buildings, more particularly for the house lead-in bushings of feeding lines (main electric cable, gas and water supply lines and long-distance ducts) in buildings.
Generally speaking, house lead-in bushings for feeding lines of buildings are constructed with casing tubes or protective tubes which are fitted in an appropriately made masonry opening in the cellar wall and through which the particular feeding line is then passed.
As is well known, the insertion of these protective or casing tubes is caused by making the masonry opening somewhat larger, so that between the wall with the masonry opening and the house lead-in bushing an air gap remains which is filled up with mortar. This mortar serves both for the mechanically fixed anchorage of the lead-in tube in the masonry and for the sealing of the tube thereagainst.
As is generally known, the problem here is to inject the mortar or the filling compound in such a way into the annular gap between the lead-in tube and the wall with the masonry opening that it completely fills this annular gap without leaving any voids and is in proper sealing engagement with both the outer tube wall and the generally rough and usually irregular wall with the masonry opening.
In practice, however, this can hardly be achieved, because the lean mortar has the tendency of coagulating in the lower area of the annular gap and, moreover, when it comes into contact with the absorptive masonry, it very rapidly granulates so that it is extremely difficult to place the lean mortar very deeply in the opening of the lead-in wall bushing. Also, the injection of a spray of cement grouts is hardly possible, as cement mortar reacts immediately with segregation effects upon application of mechanical pressure for the spraying, because the water is squeezed out and the mortar granulates. However, even with filling compounds that do not exhibit these phenomena, the complete filling of the annular gap without voids is a problem that can only be solved with great difficulty.
Attempts have been made in the past, especially when inserting house lead-in bushings for feeding lines in outer cellar walls, to get the above problems under control. Thus, for example, West German Patent Specification No. 29 01 266 teaches one to provide the casing tube at one end with a fixed radial flange and, at its other end, with a radial flange sliding axially thereon and supported against the particular wall surface, as well as with a clamping device mounted in the area of said sliding radial flange and consisting of a male thread of the casing tube and a coupling nut screwed thereon and supported against the sliding annular flange. Prior to inserting the casing tube into the opening of the lead-in wall bushing between the two radial flanges, the filling compound is placed on the outer surface of the casing tube and, after insertion of the casing tube, the coupling nut is tightened, so that the casing tube is pulled axially a given distance through the sliding radial flange supported against the outer wall surface, thereby causing the fixed radial flange and the sliding radial flange to be brought closer to each other in order to grout the filling compound placed therebetween tightly between the wall with the masonry opening wall and the casing tube. To this end, the two annular flanges are also provided with seals.
Undoubtedly, by adopting this prior art teaching, the filling compound can be injected tightly--without voids--and sealingly between the casing tube and the wall with the masonry opening, but the constructional effort for the casing tube, with its flanges, seals and clamping device, appears unjustifiably high.
West German Utility Model No. 83
REFERENCES:
patent: 1157986 (1915-10-01), Jager
patent: 2733939 (1956-02-01), Scherer
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