Static structures (e.g. – buildings) – Assembled in situ-type anchor or tie
Patent
1996-11-13
1998-04-21
Wood, Wynn E.
Static structures (e.g., buildings)
Assembled in situ-type anchor or tie
52700, 52704, 523023, 5274521, 249 91, 249 97, 411 44, 411 55, F16B 1306, F16B 1312
Patent
active
057406510
DESCRIPTION:
BRIEF SUMMARY
The subject of the present invention is an anchoring sleeve intended to receive a screw in a concrete building element, the sleeve consisting of a tubular body made of synthetic material which on the inside has a screw thread which corresponds to the screw thread of the screw and, on the outside, has peripheral anchorage and load-spreading bosses and two longitudinal ribs, this body being surrounded by a metal shell consisting of two half-shells fixed to the longitudinal ribs of the body made of synthetic material in order to create a diametral clearance intended to take up the differential plastic/metal/concrete expansions.
Anchoring sleeves of this type are described in the patent FR 2,425,014 and 2,636,685 in the name of the Applicant. These sleeves can be built into a concrete element at the time of its manufacture, or can be placed in a subsequent operation, sealed in with quick-setting mortar or resin. These sleeves are known to users under the brand name PLASTIRAIL and are, above all, used for fixing rails to concrete sleepers. The body made of synthetic material of these sleeves is closed at its end and the metal shell completely surrounds the body made of synthetic material, that is to say also surrounds its non-threaded upper part and its lower end, even though these regions do not need to withstand the force of the anchor bolt. These sleeves come with a plug so as to prevent entry into the sleeve of water or any foreign body, such as a stone, liable to oppose the screwing of an anchor bolt into the sleeve with the risk of bursting of the sleeve and cracking of the concrete under the pressure of the anchor bolt. These plugs, do not, however, provide a perfect seal and water can enter the sleeve and collect in the bottom thereof. Under certain weather conditions this water may freeze and form a plug of ice against which the anchor bolt bottoms out when it is screwed into the sleeve. This plug of ice may then have the same effect as a stone, that is to say may transmit the pressure of the anchor bolt to the sleeve and to the surrounding concrete, with the risk that the pressure exerted might lead to cracking of the concrete and breakage of the screw threads of the sleeve.
The object of the present invention is to eliminate the risks explained herein above and at the same time to reduce the cost of the sleeves.
To this end, the anchoring sleeve according to the invention is characterized in that the metal shell stretches only over part of the body made of synthetic material so as to leave at least the lower end of this body free, and in that the said lower end can be destroyed.
The metal shell preferably stretches only over the height which, mechanically speaking, is necessary, that is to say around the threaded part of the body made of synthetic material, thus making it possible to reduce the amount of metal used, which has the result of substantially reducing the cost price of this shell and thus the final cost price of the anchoring sleeve.
When the anchoring sleeve is placed in the concrete, the lower end of the body made of synthetic material is destroyed, for example by perforation, which allows water to drain out of the sleeve.
When the prefabricated concrete element is obtained by casting, perforation may be provided by a spike fixed in the mould. After mould release, this spike leaves a passage which forms a drainage well.
In one embodiment, the lower end of the body made of synthetic material is closed by an end cap made of a material that can be destroyed, for example, by using an appropriate solvent. In addition, destroying this end cap leaves a cavity situated underneath the threaded part of the body of the sleeve and substantially below the lowermost point reached by the screw or the anchor bolt so that a foreign body, for example a pebble, has no effect on the anchoring sleeve and the surrounding concrete.
When the capped sleeve is used in a mould equipped with a spike as described earlier, the spike spears the end cap so that after the end cap has been destroyed, a drainage well is f
REFERENCES:
patent: 751180 (1904-02-01), Krause
patent: 1264189 (1918-04-01), Keator
patent: 2545045 (1951-03-01), Rosan
patent: 2560951 (1951-07-01), Henderson et al.
patent: 4195709 (1980-04-01), Gianotti et al.
patent: 4412407 (1983-11-01), Melfi et al.
patent: 4629155 (1986-12-01), Dula
patent: 4642964 (1987-02-01), Kellison
patent: 4861197 (1989-08-01), Calandra, Jr.
patent: 4946325 (1990-08-01), Abraham
patent: 5085547 (1992-02-01), Vanotti
patent: 5490750 (1996-02-01), Gundy
patent: 5641256 (1997-06-01), Gundy
Search Report listing cited references.
Callo Laura A.
Vape Rail International S.A.
Wood Wynn E.
LandOfFree
Anchoring sleeve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anchoring sleeve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anchoring sleeve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2049824