Concrete form member

Details Concrete form member Concrete form member

1999-03-02

2001-10-02

Safavi, Michael (Department: 3635)

Static molds

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

Forming building structure

C249S043000, C249S192000, C052S630000

Reexamination Certificate

active

06296224

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a concrete form member for assembling a concrete form employed for placing concrete or forming a concrete secondary product in construction work or engineering works, for example.
2. Description of the Prior Art
In general, a wooden form member prepared by nailing cross bars to a plywood board or a metal form member prepared by fixing metal ribs to an iron plate or an aluminum plate is known as this type of concrete form member. As a typical example of the conventional wooden form member,
FIG. 11A
shows a form member
70
prepared by fixing a flat plate
71
of plywood, for example, to a plurality of reinforcing cross bars
72
with nails
73
. In order to assemble a concrete form with such form members
70
, nails
73
are driven into adjacent reinforcing cross bars
72
of the form members
70
for connecting and fixing the same to each other.
FIG. 11B
shows an exemplary concrete form having a cross-shaped concrete forming part
74
assembled in the aforementioned manner. The flat plate
71
may be formed by a plastic plate, in place of the plywood board.
An example of a conventional form member space holder for fixing a pair of form members
70
at a prescribed space through concrete placing surfaces when assembling a concrete form with the form members
70
is described with reference to
FIGS. 12 and 13A
to
13
C. Referring to
FIG. 12
, the conventional form member space holder is mainly formed by a separator
121
, attachments
122
and clamp members
123
. The separator
121
is formed by a bar provided with a pair of male screws
121
a
on both ends thereof, as shown in FIG.
13
A. Each male screw
121
a
is fitted with a female screw
122
c
provided on an end of each attachment
122
shown in FIG.
13
B. The attachment
122
is provided on another end with a male screw
122
d,
which is substantially coaxial with the female screw
122
c,
passing through a separator mounting hole
76
provided in each form member
70
so that an end of a substantially truncated-conical presser
122
a
of resin engaging with the outer periphery of an attachment body part
122
b
is in contact with the concrete placing surface of the form member
70
. A female screw
123
a
provided on an end of each clamp member
123
is fitted with the male screw
122
d
of the attachment
122
, thereby clamping/fixing the attachment
122
to the form member
70
.
A male screw
123
b
is provided on another end of the clamp member
123
, so that a support member
124
and a nut
125
, mounted on this male screw
123
b
fix thin cylindrical form support members
126
of a metal to bridge a plurality of transversely arranged form members
70
.
As a typical example of the conventional metal form member,
FIG. 14A
shows a form member
80
prepared by bonding/fixing side plates
82
and reinforcing plates
83
to a metal flat plate
81
.
FIG. 14B
shows an exemplary concrete form having a cross-shaped concrete forming part
84
assembled by a plurality of such metal form members
80
. In this form, metal auxiliary members
85
are employed on corners of the cross-shaped concrete forming part
84
, in addition to the form members
80
.
Japanese Utility Model Laying-Open No. 62-54149 (1987) discloses a conventional form member of synthetic resin. In the form member of synthetic resin described in this literature, reinforcing projections are integrally provided on four points on the rear surface of a plate member of plastic having a square front surface. These projections have receiving holes for connectors, while receiving holes for separators are formed in prescribed portions of the plate member.
Among the aforementioned conventional form members, the wooden form member is lightweight and has a degree of freedom in execution. However, the wooden form member has such disadvantages that the same can be reused only three or four times since the plywood board absorbing strong alkaline moisture starts to come off from an end portion when used several times, requires skill for assembling/execution, is unsuitable for global environmental protection due to consumption of Laura as raw material and industrial wastes resulting after use, and is not applicable to high-grade concrete having a low slump and high strength due to limitation of employment of a vibrator resulting from low strength.
Further, the hygroscopius plywood board absorbs moisture from a surface of placed concrete, which is in contact with the plywood board, and an ideal water-cement ratio of the concrete is lost in this portion, to result in rough finishing of the outer surface of the concrete. In this case, the concrete may be erroneously regarded as defectively hardened. Therefore, prescribed coating is applied to the surface of the plywood board for reducing its hygroscopius. However, the cost for such a coated plywood board is unpreferably increased.
Although the metal form member has high strength, the degree of freedom in working is so small that the executable range is limited and the form member is hardly applicable to general construction work. Further, the heavy metal form member must inevitably be reduced in size, leading to inferior execution efficiency. Further, the metal form member is generally rusted or unusably deformed if insufficiently managed, and extremely hard to repair in such a state.
In order to solve the aforementioned problems of the conventional concrete form members, the inventor has already proposed the structure of a concrete form member shown in
FIGS. 15
to
17
in U.S. Pat. No. 5,632,923.
As shown in
FIGS. 15 and 16
, an improved concrete form member
1
proposed in the aforementioned literature has a main plate portion
3
formed by such a long flat plate that the length between both longitudinal ends
3
B (showing in
FIG. 17
, is set about 10 times that between both cross-directional ends
3
A, with flat front and rear surfaces
3
C and
3
D. A pair of side plate portions
4
are formed by long strip-shaped bodies perpendicularly extending from the cross-sectional ends
3
A of the main plate portion
3
toward the rear surface
3
D to face each other, and surfaces
4
A thereof are flatly formed. Further, a pair of rear plate portions
5
are formed by long strip-shaped bodies perpendicularly extending inward from both cross-directional forward ends
4
B of the side plate portions
4
to face the rear surface
3
D of the main plate portion
3
. Surfaces
5
A of the rear plate portions
5
are flatly formed while forward ends thereof inwardly project to form reinforcing thick portions
5
B.
A plurality of mounting holes
6
are formed along the cross-directional center of the main plate portion
3
of the form member at prescribed intervals in the longitudinal direction. Further, a plurality of mounting holes
7
are formed in each of the pair of side plate portions
4
in correspondence to the positions of the mounting holes
6
of the main plate portion
3
. Each mounting hole
7
is arranged on a position at a prescribed distance L from the front surface
3
C of the main plate portion
3
along the cross direction. In addition, a plurality of mounting holes
8
are formed in each of the pair of rear plate portions
5
in correspondence to the positions of the mounting holes
6
of the main plate portion
3
. Each mounting hole
8
is formed on a position at a distance L, identical to the distance L between the center of each mounting hole
7
and the front surface
3
C of the main plate portion
3
, from the surface
4
A of each side plate portion
4
along the cross direction.
As shown in
FIGS. 17 and 18
, each of end plate bodies
9
engaging with both longitudinal ends of a form member body
2
is formed by a flat horizontal end plate portion
10
shielding each longitudinal end of the form member body
2
and a pair of vertical end plate portions
11
and
12
perpendicularly extending from front and rear ends of the horizontal end plate portion
10
, and has a substantially U-shaped section. The horizontal end

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