Static structures (e.g. – buildings) – With component having discrete prestressing means – Anchorage
Patent
1996-03-19
1998-02-03
Kent, Christopher
Static structures (e.g., buildings)
With component having discrete prestressing means
Anchorage
5274519, 527452, 403371, 403374, E04C 512
Patent
active
057131694
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention concerns a conical anchoring system for one or more loaded, stressed or pre-stressed tension element(s), such as construction ties, which comprise at least one conical anchor casing and an anchor body fitting into a sleeve and holding the tension element(s), the body evincing a surface essentially freely sliding along the casing wall. Further, the invention concerns a method for manufacturing a conical anchoring system and a method for cladding/coating filler particles used in an anchoring system.
BACKGROUND OF THE INVENTION
The Swiss construction industry has assumed since the 1950's an outstanding position in the field of pre-stressed engineering. Within this field in the late 60's, the special branch of parallel cable or stranded cables for braced construction was developed. Pioneering examples are the cable bridge at Mannheim-Ludwigshafen and the Olympic roof at Munich. Aerospace developments in carbon-reinforced plastics in recent years made it plain that the use of parallel cable bundles with carbon-fiber cables should be considered in the field of construction. In particular, appropriate replacement of the heavy, corrosion-susceptible steel cables in pre-stressed or braced construction suggested itself. The requirements set, for instance, on cable bridges that the cables be in the form of a lightweight, rigid, corrosion-resistant and long-term stable material with high fatigue resistance lead to carbon-fiber reinforced epoxy resins. Fiber-composite materials are highly advantageous because of combining high strength and low bulk-density, while simultaneously eliminating the corrodibility of steel cables.
The basic problem is to reliably anchor carbon-fiber reinforced tension bars replacing steel cables in construction involving bracing wires and cables in such manner that the high static strengths and fatigue resistances can be exploited optimally. Rupture in tension tests should take place not in the anchoring but along a free site. In principle, therefore, this is a linkage problem, namely the problem between the cable and the anchoring, more specifically regarding the conventionally selected conical anchorings at the linkage of the cable and anchor body.
In recent years, research and development has been applied to the anchoring of composite tension elements. Much of this work has concentrated on fiberglass-reinforced tension bars and aramide strands, and is discussed for instance in the literature of Mitchell et al, 1974; Kepp, 1985; Walton & Jeung, 1986; Burgoyne, 1988; and Dreessen, 1988. However, glass and aramide composites offer too low a rigidity for main support structures, and carbon-fiber reinforced materials must then be used. Some work has been carried out on carbon-fiber reinforced tension members, for instance by Walton & Yeung, 1986, and Yeung & Parker, 1987. However, the test results seem short of the success required for reliable and large-scale application in construction.
The main goals in designing an anchoring system are to achieve the most advantageous stress distribution, and, as regards the tension tests, to shift the cable ruptures to unencumbered sites and to reduce the anchoring system's tendency to creep. Basically, extant anchoring systems can be divided into three categories: clamped anchoring, bonded anchoring and conical anchoring. Steel cables and fiberglass bars can be anchored by means of all three, compression sleeves for smaller tension elements being more frequently used in practice, whereas cast anchors are mostly used for larger cables. As a rule, conical cast anchoring systems have been preferred for the carbon-fiber reinforced bars and cable.
BRIEF DESCRIPTION OF THE INVENTION
Essentially the anchoring system is composed of four parts: threads; casing;
In general, the anchor casing is made of steel. However, it can also be made of a fiber composite or be in the form of a steel anchor casing reinforced with fiber composites. The casing also serves as a mold for making the anchor body. The anchoring body per s
REFERENCES:
patent: 4662134 (1987-05-01), Illgner
patent: 4744691 (1988-05-01), Thal
Kim Patrick
Meier Heinz
Meier Urs
Eidgenossische Materialprufungsund Forschungsanstalt EMPA
Kent Christopher
LandOfFree
Anchorage device for high-performance fiber composite cables does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Anchorage device for high-performance fiber composite cables, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Anchorage device for high-performance fiber composite cables will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-653676