JP3006339B2 - Concrete formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork of a building or civil engineering structure.

[0002]

2. Description of the Related Art A conventional concrete formwork is generally assembled at a building site using wooden plywood as a material.
However, with the background of recent advances in materials and processing methods, various methods have been developed and devised for the purpose of reducing on-site work and shortening the construction period. For example, there are a steel plate form, an aluminum form, a precast concrete form, and the like.
The steel plate form or the aluminum form is a method in which a steel plate or an aluminum plate is formed into a panel shape at a factory and assembled on site. The mold is to be removed and reused after the concrete has hardened. The precast concrete formwork is also manufactured in advance at the factory in accordance with the outer shape of the beams, columns, and the like, and is assembled and used on site.

[Problems to be solved by the invention]

However, the above-described mold has the following problems. In other words, steel sheet formwork and aluminum formwork require sheet metal processing for cutting and joining, but these processing cannot be performed on site, and all are factory processing, so only standardized building members can be used. Cannot be used and lacks flexibility. In addition, processing at the factory, such as removal of goby and fine adjustment of dimensions, is complicated, and the production cost is high. In addition, since the steel sheet form is particularly thick in thickness, the weight becomes heavy, and it is inconvenient to carry in, remove after use, and other handling. Furthermore, the steel plate form and the aluminum form cannot be discarded, and the work cannot be advanced until the concrete is dried and hardened to the extent that the form can be removed after the concrete has been cast. Had become. Precast concrete forms are also expensive to manufacture in factories, lack flexibility, and are heavy and inconvenient to handle, similar to steel sheet forms and aluminum forms.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is a lightweight, lightweight and easy-to-use conc.
The purpose is to obtain a REIT formwork.

[0005]

According to the present invention, a concrete formwork includes a face member made of a hinged thin steel sheet,
And a stiffener for stiffening the face material from its outer periphery.
The stiffener has a substantially U-shape having legs at both ends.
Together with the formed stiffening plate and the legs at both ends of the stiffening plate
With stiffening rods extending from both legs
It becomes .

Further, a plurality of stiffening plates are installed on each stiffening bar.
At the same time, each stiffening plate can slide on the stiffening bar
It is composed .

[0007]

In the concrete form constructed as described above, a thin steel plate can be used as a waste form.

In addition, the hinge joint enables the face material to be bent and transported, and allows the shape of the form to be determined by freely bending during installation at the site. Furthermore, when the concrete is cast, the stiffening plate stiffens the surface of the concrete form from the outer surface, so that the surface of the concrete form does not bend due to the pressure of the concrete, and the dimensional accuracy is maintained. It is.

Also, the stiffening plate extends from both legs and is attached.
The stiffening bars can be interconnected
And excellent workability.

[0010] Further, a plurality of stiffening plates installed on each stiffening bar
By sliding it against the stiffening rod,
The position of the stiffening plate can be adjusted according to the size.

[0011]

Embodiment 1 FIG. 1 is a front view of one embodiment of a face plate for a concrete formwork according to the present invention. In the figure, reference numeral 50 denotes a face plate for a concrete form, and reference numerals 1, 2, 3, and 4 denote plates formed of a thin steel plate or the like constituting the face plate 50 for a concrete form. The parts are hinged via a shaft 5, and the plate 1 and the plate 2 or the plate 3 and the plate 4 are rotatable. The contact portions between the plate 1 and the plate 3 or between the plate 2 and the plate 4 are wrapped or sealed as necessary.

FIG. 2 is a plan view of a face plate 50 for a concrete formwork according to the present invention. As shown in the figure, the hinge portion is formed by winding one side end of the plate inward to form a tubular portion, and the shaft 5 is inserted through the tubular portion.

Next, a method of manufacturing the face plate 50 for a concrete formwork will be described with reference to an example of a column member. First, a thin steel plate is cut into dimensions necessary for use as a plate. FIG. 3 shows a front view of the cut plate 1. As shown in FIG. 3, convex portions and concave portions are provided at alternate positions on both side ends of the plate 1. That is, the convex portions on the left side in the figure are denoted by 1a, 1c, and 1e, and the convex portions 1
Assuming that a concave portion between the convex portion 1a and the convex portion 1c is 1B and a concave portion between the convex portion 1c and the convex portion 1e is 1D, the right end of the panel 1 has a position opposite to the convex portions 1a, 1c and 1e. Each recess 1
A, 1C and 1E are formed, and convex portions 1b and 1d are formed at positions facing the concave portions 1B and 1D, respectively. In addition, the convex part and the concave part of both side end parts are formed in the shape which fits mutually. A required number of plates having the same shape as the plate 1 as described above are manufactured.

Next, as shown in FIG. 4, a suitable number of plates are arranged in the longitudinal direction, and a shaft 5 formed of a round bar for a reinforcing bar or the like is provided at one end of the plate. And the convex part of the plate is
Wrap around. At this time, the joint between the upper and lower plates is wrapped or sealed as necessary. When the projection is wound around the shaft 5, a certain gap is provided between the shaft 5 and the plate so that the plate can rotate.

Next, as shown in FIG. 5, the plate 3 and the plate 4 are
To the hinge. FIG. 6 is a perspective view of the completed face plate 50 for concrete formwork.

Next, the state of use of the concrete form face plate 50 manufactured as described above will be described. Figure 7 when concrete formwork is taken out of the factory and brought into the site
It is good to make it folded as shown in FIG. FIG. 8 is a plan view in the case where the face plate 50 for the concrete formwork is installed on site. In the figure, 51 is another face plate for concrete formwork, and 8 is a reinforcing bar. As shown in the figure, the two face plates 50 and 51 for concrete formwork are arranged so that the hinge joints are at diagonal positions, and are installed in accordance with the reference core and the reference dimensions. At this time, the concrete form face plate 5
The concave and convex portions at the side ends of 0 and 51 are fitted to each other. Then, as shown in FIG. 9, a shaft such as a reinforcing bar is arranged at a portion of the fitting portion projecting by the fitting, and a convex portion is wound around the shaft, thereby connecting and fixing the face plates for the formwork.

Next, a stiffener is installed outside the concrete form face plate so that the plate can withstand the pressure of the concrete. Note that the face plate for concrete formwork according to the present invention requires a sheet-like stiffener since the plate is a thin steel plate. It gets messy. Thus, the stiffener shown in FIG. 10 has been devised. In FIG. 10, 10
Is a stiffening plate formed by bending a rib-processed thin steel plate into a substantially U-shape. Reference numeral 11 denotes a stiffening square member that is formed of a square steel pipe or the like and is attached to one surface of the stiffening plate 10 by penetrating the legs at both ends of the stiffening plate 10. In addition, the stiffening square member 11 is defined in the claims.
It has a function as a stiffening rod in the enclosure.

When the stiffener constructed as described above is installed on the outer surface of the concrete form face plate, one surface of the stiffening plate 10 is brought into contact with the plate of the concrete form face plate to stiffen the plate. Attachment is performed by fixing both ends of the square member 11 to stiffening square members of adjacent stiffeners. The concrete formwork comprising the face plate for the concrete formwork and the stiffener as described above is the concrete formwork according to the present invention. The installation state of the concrete formwork is shown in FIGS. FIG. 11 is a front view of an installed state of the concrete formwork, and FIG. 12 is a plan view. The installation interval of the stiffener should be such that the lower part where the lateral pressure increases during concrete casting is narrower and the upper part where the lateral pressure is lower is wide. The stiffener is removed one to several days after placing the concrete. At this time, if the concrete form is used as a waste form, the next work can be advanced without waiting for the period (about one week to 10 days) required for the concrete to dry and harden after the stiffener is removed. Can be shortened. Needless to say, this concrete form can be used as a reusable form.

Generally, when casting concrete, a separator is used to keep the covering thickness constant. However, when a concrete form is used as a pillar as in the present embodiment, a supplement is used. Since the face plate can be accurately held by the rigid material, no separator is required, and workability and economy can be improved.

The above-mentioned stiffening member is shown in the example in which one stiffening plate 10 is attached to the stiffening member 11. However, as shown in FIG. Rigid plates 13, 14
May be attached, and the stiffening plates 13 and 14 may be adjusted by sliding them according to the width of the concrete form.

Embodiment 2 FIG. In the first embodiment, the plates are arranged in two rows in the width direction, and one side end of each plate is hinged, but the present invention is not limited to this, and the 3 rows of plates in width direction
Rows or more may be arranged and hinged. FIG. 14 is a perspective view when three rows are provided. In the figure, 1
Reference numerals 5 and 16 denote plates hinged to the plates 2 and 4 by a shaft 17, respectively. FIG. 15 is an explanatory view of a state during transportation when three rows are provided, and FIG. 16 is an explanatory view of an installation state when three rows are provided. FIG.
It is a perspective view at the time of making into a line. In the figure, 18, 19
Are plates hinged to the plates 15 and 16 by a shaft 50, respectively. FIG. 18 is an explanatory view of a state during transportation when four rows are provided, and FIG. 19 is an explanatory view of an installation state when four rows are provided.

Embodiment 3 FIG. In the first and second embodiments, the case of the column material has been described. However, the present invention is not limited to this. For example, the present invention can be used for a beam material.
Hereinafter, the case of the beam material will be described. FIG. 20 is a perspective view of a face plate 20 for a concrete formwork for beams. In the figure, 21, 22, and 23 are plates,
The plate 22, the plate 22, and the plate 22 and the plate 23 are hinge-joined as described in the first and second embodiments. Reference numerals 24 and 25 denote upper surface reinforcing members (deck plate receivers) each having an L-shaped cross section and attached to side ends of the plates 21 and 25, respectively. FIG. 21 shows a state of the concrete form face plate 20 configured as described above during transportation. In the figure, the same parts as those in FIG. 20 are denoted by the same reference numerals.

Next, the installation state of the concrete form using the concrete form face plate 20 will be described. FIG.
FIG. 2 is an explanatory diagram for explaining an installation state of a concrete formwork. In addition, also when using for a beam material, a formwork is comprised from a faceplate for formwork and a stiffener. In the figure, the same parts as those in FIG. 20 are denoted by the same reference numerals, and description thereof will be omitted. 31 is a deck plate, 32 is a support for installing a concrete formwork in a predetermined position. 33 and 34 are stiffeners similar to those described in the first embodiment. Reference numerals 35 and 36 denote spacing metal fittings for keeping the distance between the plate 21 and the plate 23 constant. Concrete beams are cast on the concrete formwork installed as described above to form beams.

The thickness of the thin steel plate used for the plate is
0.3mm to 1.5mm or less. In order to increase the out-of-plane rigidity of the plate and reduce the thickness of the thin steel plate used as the plate, it is effective to subject the surface of the plate to rib processing. FIG. 23 is an explanatory diagram for explaining a mode of the rib processing. 41 and 42 are provided with convex portions on the surface of the plate, and 43 and 44 are formed by welding or screwing ribs.

In the first and second embodiments, an example in which a thin steel plate is used as the plate of the concrete form is shown.
The present invention is not limited to this, a thin steel plate may be processed into a lath shape or expanded metal shape,
Further, a resin-based material such as plastic may be used instead of the thin steel plate. Further, a thin steel plate, a rib-processed thin steel plate, or a plate using a resin material may be used in combination as a plate. Further, a water-permeable material such as cloth or paper may be provided inside the plate.

In the first embodiment, an example is shown in which a thin steel plate is used as the stiffening plate.
A metal material other than a steel plate such as a titanium plate, a resin-based material such as plastic, or a wooden plate may be used. Further, these materials may be appropriately used in combination. By combining various materials in this way, high rigidity can be used in areas where surface pressure is strong, and low rigidity can be used in areas where surface pressure is weak, which can increase economic efficiency. it can.

[0027]

As described above, in the present invention, since the thin steel plate is used as the face material of the face plate for the concrete formwork, the formwork can be used as a discarded formwork, and after the stiffener is removed. The next operation can be performed without waiting for the concrete to dry and harden, and the construction period can be shortened. In addition, processing and transportation at the factory are facilitated, and workability at the site is improved. In addition, since the thin steel plates are joined via the hinge, the number of sheets to be joined can be easily increased as required, standardization is possible, and flexibility is excellent. Furthermore, since the concrete formwork was composed of a thin steel face plate, a stiffening plate and a reinforcing rod,
The overall weight is reduced and the stiffness of the face plate increases dimensional accuracy.
Good.

Further , a stiffener is provided by a substantially core having legs at both ends.
A stiffening plate formed in a U-shape and legs at both ends of the stiffening plate.
And the stiffening rods extended from both legs and attached
Because it is equipped with, it extends from both legs of the stiffening plate
Can be connected to each other
Installation and removal of stiffeners
Workability is improved, which contributes to shortening the construction period.
You.

Further, a plurality of the stiffening plates are provided on each stiffening rod.
And slide each stiffening plate against the stiffening bar.
The stiffening plate slides against the stiffening bar
The position of the stiffening plate according to the size of the face material.
It can be adjusted and can be applied to face materials of various sizes.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a face plate used for a concrete formwork according to the present invention.

FIG. 2 is a plan view of one embodiment of a face plate used for a concrete formwork according to the present invention.

FIG. 3 is a front view of a plate of a face plate used for the concrete formwork according to the present invention.

FIG. 4 is an explanatory view for explaining a manufacturing process of a face plate used for a concrete formwork according to the present invention.

FIG. 5 is an explanatory view for explaining a manufacturing process of the face plate used for the concrete formwork according to the present invention.

FIG. 6 is a perspective view of a face plate used for the concrete formwork according to the present invention.

FIG. 7 is an explanatory diagram illustrating a state of the concrete formwork according to the present invention during transportation.

FIG. 8 is a plan view when the concrete formwork according to the present invention is installed on site.

FIG. 9 is an explanatory view when a concrete formwork according to the present invention is installed on site.

FIG. 10 is a perspective view of a stiffener used for a concrete formwork according to the present invention.

FIG. 11 is a front view of an installed state of a concrete formwork according to the present invention.

FIG. 12 is a plan view of an installed state of a concrete formwork according to the present invention.

FIG. 13 is a plan view of another embodiment of the stiffener used for the concrete formwork according to the present invention.

FIG. 14 is a perspective view of another embodiment of the face plate used for the concrete formwork according to the present invention.

FIG. 15 is an explanatory view illustrating a state of another embodiment of the face plate used for the concrete formwork at the time of transportation.

FIG. 16 is a plan view when another embodiment of the face plate used for the concrete formwork according to the present invention is installed on site.

FIG. 17 is a perspective view of another embodiment of the face plate used for the concrete formwork according to the present invention.

FIG. 18 is an explanatory view illustrating a state of another embodiment of the face plate used for the concrete formwork according to the present invention during transportation.

FIG. 19 is a plan view when another embodiment of the face plate used for the concrete formwork according to the present invention is installed on site.

FIG. 20 is a perspective view of a face plate used for a concrete formwork for beams according to the present invention.

FIG. 21 is an explanatory diagram for explaining a state during transportation of a face plate used for a concrete formwork for beams.

FIG. 22 is an explanatory diagram for explaining an installation state of a concrete formwork for a beam member.

FIG. 23 is an explanatory diagram for explaining a form of rib processing on a plate surface.

[Explanation of symbols]

 1,2,3,4,21,22,23 plate 5 axis 10,13,14 stiffening plate 11,12 stiffening bar 50 face plate for concrete formwork

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 61-163846 (JP, U) Japanese Utility Model Showa 60-87959 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04G 9/08 E04G 13/02 E04G 9/00 E04G 17/00

Claims (2)

(57) [Claims] 1. A face plate made of a hinged thin steel plate
And a stiffener for stiffening the face material from its outer periphery.
A concrete frame, wherein the stiffener is formed in a substantially U-shape having legs at both ends.
A stiffening plate, and both legs
And a stiffening rod extending from and attached to the concrete formwork. 2. A plurality of stiffening plates are provided on each stiffening bar.
And each stiffening plate can slide on the stiffening bar.
The concrete formwork according to claim 1, wherein the concrete formwork is configured to have a shape.