Static structures (e.g. – buildings) – Shaped or strengthened by fluid pressure – Including ingress/egress provision
Patent
1995-01-17
1997-03-11
Friedman, Carl D.
Static structures (e.g., buildings)
Shaped or strengthened by fluid pressure
Including ingress/egress provision
52 215, 522208, 52576, E04G 1104, E04H 1520
Patent
active
056089910
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
This invention relates to a flexible form member which is preferably used in constructing new buildings of reinforced concrete, or foundations for buildings of reinforced steel-framed or steel-framed concrete or of wood, and a method of forming a through hole by means of the form member.
In constructing the above-mentioned buildings, it is necessary to form through holes in beams, walls, slabs, foundations, or the like, associated with constructing general facilities or ventilation for the buildings, and then a flexible form member is employed to form such a through hole at the same time concrete is poured.
BACKGROUND ART
Generally, a paper pipe, a steel sheet or a steel pipe has been used as such a conventional flexible form member. That is to say, in a conventional construction method, as shown in FIG. 18, a paper tube c is arranged at a desired position in a condition of being interposed between an outer form a and an inner form b, then concrete is poured into a space between the above-mentioned outer form a and inner form b in order to form slabs, beams, or walls. The outer form a and the inner form b are removed when the concrete has cured, then the above-mentioned paper tube c is removed thereby to form a through hole.
However, a plurality of reinforcements have been arranged over and under the through holes to be formed, as shown in FIG. 18. In order to arrange a paper tube c whose diameter is larger than a pitch between reinforcements d, the paper tube c should be temporarily deformed into flat and inserted into the space between reinforcements d, then it should be arranged to bridge the outer form a and the inner form b while restoring the original shape. Therefore, it takes much labor and time to make an arrangement for forming a plurality of through holes. In addition, the paper tube c may accidentally be set before it has been restored to the original shape, which will cause a problem that the opening of the through hole deforms.
In order to solve the above-mentioned problem, a method can be conceived that the paper tube c is set after only the reinforcement e under the paper tube c has been arranged, then the reinforcement d over the paper tube c is arranged. However, it deteriorates the work efficiency because it prevents work which involves welding or the like from being continuously accomplished. In addition, the paper tube c which has once been set may be pushed by unexpected force which may arise when the reinforcement d over the paper tube c is arranged thereby to change the position where it should be. Thus it prevents from forming a hole which penetrates the concrete at the predetermined position.
It is an object of the present invention to provide a flexible flexible form member which solves the above-mentioned problems.
DISCLOSURE OF THE INVENTION
To accomplish the above-mentioned object the invention has adopted the following structure. The flexible form member in accordance with the invention comprises a hollow-shaped body having a flexibility, and openable fluid introducing and discharging means for permitting fluid to be introduced into and discharged from the body.
The openable fluid introducing and discharging means preferably comprises a tubular passage part which is connected to the body and a cap member which is attached to an outside end of the passage part and able to open. The length of the tubular passage part is not specified, and it may be the same that the body length or may be so short that the cap member locates near the body. It is preferable that the passage part has a check valve at an end near the body side.
The body may also have a connecting part on its surface to connect a fixing member for securing the body. The body preferably comprises a circular wall being cylindrical and an end wall fixed integrally and airtightly on each of ends of the circular wall. The operable fluid introducing and discharging means is preferably provided on at least the circular wall and one of the end walls.
A method of forming a through hole by means of a f
Friedman Carl D.
Horton-Richardson Yvonne
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