Static structures (e.g. – buildings) – Frangible section or means
Patent
1986-03-24
1988-05-10
Murtagh, John E.
Static structures (e.g., buildings)
Frangible section or means
52 62, 52364, 52699, 52710, 52583, E04B 141
Patent
active
047426551
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a device in concrete structures cast in situ, more specifically to a device for making recesses in a concrete structure during casting and for the protection of reinforcing steel intended to connect this concrete structure with at least one further concrete structure, the device including a section which may be cast into the first-mentioned concrete structure, the section having a covering strip and together therewith forming a space accommodating reinforcing steel extending through one wall of the section.
2. Background Art
Casting joints are formed in concrete structures cast in situ, such as walls, floors and arches. Reinforcement must be arranged at each joint for uniting the structures to each other. The part of the reinforcement which is to be cast into the structure which will later be connected to an already cast structure must be protected against running cement and concrete so that the adhesion capacity of the reinforcement will not be spoiled. Apart from splicing reinforcement, recesses must be arranged to obtain better co-action between the structures and to increase the ability of the joints to take up lateral forces.
Different devices are known for providing both protection for reinforcement and recesses.
Such a known device comprises two wooden battens with fibre-board nailed to them which are nailed to the shuttering so that a space is formed between the battens, fibreboard and shuttering. After making holes in the fibreboard, bent reinforcing bars are inserted through the holes so that parts thereof project into the shuttering of the structure which is to be cast and other parts thereof are accommodated in the mentioned space. After casting the structure, the battens and fibre board are removed leaving a recess in the structure. Before a further contiguous structure is cast the reinforcing bars are bent out from the recess so that they project into the formwork of the new structure.
The salient disadvantage with the device just described is that it is fabricated by hand, and will thus be expensive as well as inferior, inter alia with regard to strength, protection of the reinforcing and sealing round it. Another disadvantage is that it is difficult to demolish.
Another device is manufactured by Betomax GmbH, Neuss, West Germany, and is marketed under the trade name COMAX Reinforcing Joints. This comprises a strip of expanded metal, which together with a plastics strip, which may be torn from it, defines a space in which the free legs of reinforcing stirrups are inserted. The legs are inserted through and welded in holes in the strip and their stirrup-shaped parts project at right angles from it.
In the use of this device the builder must use the reinforcement which is already put in during fabrication of the device and which often does not agree with what the designer has intended, and which furthermore may be in conflict with applicable codes of practice in some cases. This means that new calculations and drawings must be made, where dimensioning of reinforcement and its placing must be adjusted to the strip and not vice versa. The expanded metal remains in the concrete structure and in general does not get a sufficiently thick covering layer of concrete, resulting in that the whole device including remaining reinforcement begins to rust, whereby the aging resistance of the concrete deteriorates considerably.
A still further known device designated HALFENEISEN Jointing Section HBT comprises a sheet metal section of U-shaped cross section with holes through which the reinforcement projects. Together with a sheet metal strip removable from it the section defines a space for parts of the reinforcement while remaining parts of the reinforcement projects out at right angles from the opposite side of the section.
This device is burdened with substantially the same disadvantages as those already described in connection with the device manufactured by Botomax GmbH. After casting, the strip is first torn off, which is troublesome due
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KaBe Industrier AB
Murtagh John E.
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