Static structures (e.g. – buildings) – Barrier or major section mounted for in situ repositioning;... – Wall extension convertible to roof
Patent
1996-12-20
1998-10-20
Kent, Christopher
Static structures (e.g., buildings)
Barrier or major section mounted for in situ repositioning;...
Wall extension convertible to roof
52677, 248 87, E04C 516
Patent
active
058229469
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a spacing member for chocking reinforcement wires. said spacing member comprising a first spacing chock provided with feet for placement on a base for casting and support surfaces for the reinforcement wires wherein the feet are provided by the ends of at least four columns interconnected by a central part which is provided between the ends of the columns and which defines, between the columns, support surfaces in different distances from the column ends
In order to position reinforcement wires in cast building structures, it is necessary to fix the reinforcement wires in relation to the total cast structure. For example this may be done by placing the reinforcement wires in spacing members designed for that purpose and positioned initially before casting and in which the reinforcement wires are also placed before the casting is done. The spacing members are usually constructed as modules in the shape of chocks.
Simpler spacing members of this type are known, e.g. from GB-A-2,206,619, which are produced from plastic and which only permit placing reinforcement wires in one or two heights from the base of the casting. Spacing members of plastic have the disadvantage that it is difficult to embed the plastic members e.g. in concrete because those two materials are very little congruent.
A spacing member is known from U.S. Pat. No. 3,387,423, which is of the type mentioned by way of introduction. A spacing member of this type comprises four columns interconnected by a central part. The spacing member could be placed on either side or at the end of the columns, thereby defining a support surface in different distances from a base upon which the spacing member is arranged. This spacing member requires a binding wire to interconnect the reinforcement wire and the spacing member. Moreover, the spacing member of this type is arranged for supporting only one reinforcement wire.
In certain types there is a high risk of formation of hollows in the concrete, which causes a risk of water penetration or formation of condensate with a consequent risk of corrosion on the reinforcement. This contributes to heavy weakening of the concrete structure.
Spacing members of concrete are also known which have a design, however, that involves various disadvantages. Firstly, it is necessary to use binding wire in order to fasten the reinforcement wires to the spacing members. In order to avoid the risk of any possible deterioration of the appearance of the finished structure, a second requirement is that the casting moulds have to be vacuumed in order to remove any remainders of cut binding wire. This prevents the formation of corrosion near the surface of the finished structure. Thirdly, the constructions used for known members are inappropriate since it is very difficult to make a complete casting all around the members, and it is particularly difficult to make a casting under the members.
Finally, with the known members there are limited possibilities of varying the support level of the reinforcement wires. The most common levels of support for the reinforcement wires from the bottom or the sides of the concrete structure are the distances of 25, 30, 35, 40 and 50 mm. Using known members, it is often necessary to possess several different members each of which provides one of these desired heights.
Spacing members are also known which partly solve these problems and which are of the type mentioned in the introduction. An example among others of such a spacing member is known from the German publication No. 1,484,994. Such a spacing member is designed for placement of reinforcement wires in different levels depending on the support surfaces used. This spacing member is disadvantageous, however, since it may only be used for laying wires horizontally and only for laying reinforcement wires in one level. Furthermore, the reinforcement wires will lie loosely on the spacing member.
Spacing members are also known in which the wires may be fastened since the spacing member is set up with unde
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Horton-Richardson Yvonne
Kent Christopher
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