Formwork forming unit

Details Formwork forming unit Formwork forming unit

1999-10-15

2001-05-15

Hansen, James O. (Department: 3636)

Static molds

In situ construction engineering type or building type-mold...

Forming building structure

C052S426000

Reexamination Certificate

active

06231024

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a formwork forming unit suitable for use in forming a concrete mold serving as a foundation of a building or the like and a method of forming such a formwork.
2. Description of the Prior Art
In forming a concrete mold serving as a foundation of a building, face plates such as composite plates or metal plates are assembled into a formwork according to the shape of a concrete mold to be formed. Thereafter, concrete is placed in the formwork and hardened. The formwork is disassembled after the concrete has been hardened. In the above-described method, the assembly and disassembly of the formwork require much labor. Further, since an amount of material to be used is increased, the transport of material costs a great deal and an amount of waste material is increased.
In view of these problems, various methods eliminating the disassembly of formwork have been proposed. For example, Japanese patent publication No. 2-178421A discloses a formwork forming unit in which wire mesh frames each of which has rough meshes and includes a steel wire frame are continuously connected to one another. A fastening wire having both ends formed with generally R-shaped engagement portions respectively is bridged between the wire mesh frames for reinforcement, so that a formwork is formed. A metal lath having fine meshes is attached to the inside of each of the wire mesh frames constituting the formwork.
When concrete is placed in the above-described formwork, a concrete mold is formed with the metal laths preventing leakage of the concrete. Since the formwork is embedded in the concrete hardened, the formwork need not be disassembled. As a result, a labor saving can be achieved.
Japanese patent publication No. 10-1952A discloses another formwork forming unit as shown in
FIG. 28. A
mesh such as the metal lath is welded to a metal support having rough meshes so as to cover the meshes, so that a formwork forming member
1
is formed. A plurality of formwork forming members
1
are assembled into a formwork so as to define a forming space for a concrete mold. Connecting members
2
are attached between the opposed formwork forming members
1
for reinforcement respectively and thereafter, concrete is placed in the forming space. Each connecting member
2
includes a bar-like separator
2
a
having both ends formed with respective male thread portions and two hook-shaped members
2
b
fixed to the male thread portions by nuts respectively.
In attachment of the connecting members
2
, the hook-shaped member
2
b
is fixed to the male thread portion at one end of the separator
2
a.
The separator
2
a
is then inserted from the other end thereof through the formwork forming members
1
so as to bridge them. The hook-shaped member
2
b
is engaged with the support frame of one formwork forming member
1
. Another hook-shaped member
2
b
is fixed to the male thread portion at the other end of the separator
2
a
with an amount of threading engagement of the nut being adjusted and is further engaged with the support frame of the other formwork forming member
1
. In this construction, too, a concrete mold is formed with the mesh such as the metal lath preventing leakage of the concrete. The disassembly of the formwork is not required and the strength of the concrete mold is increased since it is reinforced by the connecting members.
The above-described formwork forming units have the following problems. In the former unit, the wire mesh frames are connected to one another and fastening wires are attached between the opposed frames, so that the formwork is formed. The metal laths then need to be attached to the inside of the formwork. As a result, the forming of the formwork requires much time. In the latter unit, when the connecting members
2
are attached to the formwork forming members
1
, the amount of threading engagement of each of the nuts with the male thread portions at both ends of the separator
2
a
respectively needs to be adjusted so that the hook-shaped members
2
b
are positioned. As a result, the attachment of the connecting members
2
requires much time.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a formwork forming unit in which the formwork used to form a concrete mold can easily be formed, the formwork need not be disassembled and the strength of the formed concrete mold can be improved, and a method of forming such a formwork.
To accomplish the object, the present invention provides a formwork forming unit comprising a generally frame-shaped form panel disposed to define a placing space for concrete, the form panel including a plurality of first reinforcing beams and a plurality of second reinforcing beams each of which has a smaller diameter than each first beam and formed into a shape of a frame, the form panel further including a meshed member fixed thereto so as to cover an inside thereof, and a generally bar-shaped separator attached to the oppositely disposed form panels so as to bridge said form panels when a plurality of the form panels are disposed to define the placing space for the concrete, the separator having both ends folded so as to be formed into hook portions respectively, the hook portions being engaged with the first beams of the oppositely disposed form panels and crimped such that the separator is fixed to the form panels.
According to the above-described unit, the hook portions of the separator are engaged with the oppositely disposed form panels respectively and then crimped such that the separator is fixed to the form panels. Thus, the separator can easily be attached to the form panels so as to bridge the form panels for improvement of the strength of the formwork. Consequently, the formwork used for forming the concrete mold can easily be formed. Further, since the hook portions are engaged with the first beams respectively, the operator can easily carry out the attachment and a high strength of the overall formwork can be achieved. Additionally, the weight of the form panel can be reduced since the second beams are suitably used as reinforcing members.
Concrete is placed in the formwork formed as described above. The meshed member prevents leakage of the concrete. Since the form panels are embedded in the concrete after the concrete has been hardened, the formwork need not be disassembled. Further, as the result of provision of the meshed member, an area of the placed concrete in contact with air is increased such that the hardening of the concrete is enhanced. Consequently, a concrete mold can be formed promptly even in a job site where water springs.
The form panel is preferably generally flat or bent. Consequently, the form panel can readily be handled when the form panel is flat. Although the form panel is flat, the side thereof may take various shapes. In a case where the form panel is bent, generally L-shaped or U-shaped form panels are assembled together when a generally prismatic formwork is formed, for example. As a result, suitable form panels are selected and disposed. Consequently, the number of components can be reduced and an energy saving can be achieved in the disposing work.
The form panel preferably includes a plurality of reinforcing bars welded together into the shape of a frame and a metal lath made of a preselected metal and welded to an inside thereof. Consequently, since the form panel is formed by welding reinforcing bars and the metal lath together, the form panel can easily be formed at a low cost.
The hook portions of the separator are preferably slightly displaced from each other axially so as not to be coplanar with each other. For example, when one of the hook portions is directed generally vertically and is caught on the first beam, the other hook slightly projects horizontally. Consequently, the hook can easily be held. Further, since the hooks are axially displaced, the separator can be prevented from clattering.
The hook portions of the separator preferably include a first hook portion engaged with one

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