JPH1177645A - Hollow form for forming hollow part of perforated panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hollow form having general-purpose properties possible to divert repeatedly. SOLUTION: Upper and lower form panels 2, 3 formed into a trough shape and having flexibility are connected to a pair of side form panels 4, 5 by hinges to form a hollow form main body 10 and a revolving shaft 6 is provided. A link mechanism 20 is provided between the respective freely bendable parts 44, 54 of the side form panels 4, 5 and the revolving shaft 6 and the freely bendable parts 44, 54 of the side form panels 4, 5 are bent inward by revolving the revolving shaft 6 to narrow the hollow form main body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow mold for forming a hollow portion of a perforated plate, and more particularly to a hollow mold for facilitating removal from a mold.

[0002]

2. Description of the Related Art Heretofore, perforated plates having a plurality of hollow portions in the center to reduce the weight per unit volume have been widely used as floor plates requiring particularly large spans. A conventional method of manufacturing this type of perforated plate will be described with reference to FIG. 5. First, after assembling a floor form 102 supported by a support 101, a lower floor reinforcing bar 103 and a lower floor 104 are provided. The beam reinforcement 107 of the beam portion 106 that joins the upper floor 105 and the upper floor 105 is assembled, and then the rubber tubular form 108 for forming the hollow portion H is expanded by injecting compressed air. After attaching to the predetermined position, the upper floor reinforcement 109 is performed, and concrete is poured. When the cast concrete is hardened, the compressed air filled in the tubular form 108 is evacuated and the mold is removed to obtain a perforated plate 100 having a hollow portion H.

[0003]

However, when a rubber tube-shaped form is used to form the hollow portion of the perforated plate, the shape and size when expanded by injection of compressed air are constant. However, the cross-sectional shape and the opening diameter of the hollow portion become constant and are restricted by this, and there is a problem that versatility is lacking. In addition, as the length of the rubber tube-shaped form becomes longer, it becomes more likely to bend or twist due to the buoyancy caused by casting concrete. In addition, it is necessary to take appropriate measures such as providing appropriate reinforcement, and there is a problem that it takes time to remove the mold.

SUMMARY OF THE INVENTION An object of the present invention is to provide a versatile hollow formwork which can solve the above-mentioned problems in the prior art and can be repeatedly diverted to form a hollow portion of a perforated plate. Is to do.

[0005]

A feature of the present invention for solving the above-mentioned problem is that a hollow mold for forming a hollow portion of a perforated plate has a flexible shape which is formed in a gutter shape and opposed to each other. An upper and lower form panel having a central portion longitudinally coupled to the upper and lower form panels by being hinged between both side edges of the upper and lower form panels, respectively. A hollow form body including a pair of side form panels having bendable portions along the same; a rotating shaft rotatably provided along a central axis of the hollow form body; Between the rotating shaft and the pair of side form panels, the pair of side form panels are bent inward from a central portion by a rotating operation of a dynamic shaft to narrow the hollow form body. And a link mechanism provided in the above.

According to the present invention, in the above-mentioned structure, the link mechanism corresponds to a pair of fixed arm members each having one end fixed to the rotation shaft, and the other end of each of the pair of fixed arm members. And a connecting arm connected to the bendable portion of the side form panel.

According to the present invention, in the above structure, the rotating shaft is configured to be rotatably supported by supporting members disposed near both ends in the axial direction of the hollow form body. Can also.

According to the present invention, in the above configuration, a plurality of the link mechanisms may be provided at appropriate intervals along the axial direction of the rotation shaft.

In the above-mentioned invention, the link mechanism is operated by rotating the rotating shaft, whereby each bendable portion of the pair of side form panels is drawn into the hollow form body, and Each of the side form panels is bent at the bendable portion to narrow the hollow form body. Therefore, setting this hollow formwork and casting concrete,
When the rotating shaft is rotated after the concrete has hardened to narrow the hollow form body, the outer surface of the hollow form body can be easily peeled from the cast concrete. As described above, the mold can be removed by a simple operation, and the hollow mold after the removal can be used repeatedly. Also, by appropriately replacing the upper and lower formwork panels and the side formwork panels,
The shape and the opening diameter of the hollow portion of the hollow form body can be easily changed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view showing an example of an embodiment of a hollow mold according to the present invention, and FIG. 2 is a partial perspective view thereof. The hollow form 1 is for forming a hollow portion of a perforated plate. In the present embodiment, the hollow form 1 is a hollow form in which the upper, lower, left and right sides are symmetric and substantially elliptical. And a lower mold panel 3 which is arranged to face the upper mold panel 2 and is also formed in a gutter shape. The upper and lower formwork panels 2 and 3 are made of a material having sufficient rigidity to withstand the weight of cast concrete, such as steel or plastic, and have a flexible arc diameter by applying an external force. It is formed to have a thickness having properties.

A flat side form panel 4 is provided between one side edge 2A of the upper form panel 2 and one side edge 3A of the lower form panel 3 opposed thereto. The one side edge 2A and the one side edge 3A are connected via the side form panel 4. The side form panel 4 is formed by hinge-connecting a pair of flat panel panels 41 and 42 such that the side form panel 4 can be bent along the longitudinal direction at a substantially central portion thereof. The flat panel panels 41 and 42 also have upper and lower formwork panels 2,
3 can be made from the same material. In the present embodiment, tubular portions 41A and 42A formed in a tubular shape are alternately formed at the joining edge portions of the flat panel 41 and the flat panel 42, respectively.
By passing the mandrel 43 through these in a state where A is aligned, the flat panel 41 and the flat panel 42 are hingedly connected to each other to form a bendable portion 44 (see FIG. 2).

The connection between the flat panel 41 and the upper form panel 2 and the connection between the flat panel 42 and the lower form panel 3 are made in the same manner as the hinge connection between the flat panels 41 and 42 described above. Reference numerals 45 and 46 in FIGS. 1 and 2 denote mandrels for hinge connection.

On the other hand, the other side edge 2B of the upper mold panel 2
Another flat plate-shaped side panel 5 is provided between the lower side of the lower side panel 3 and the other side edge 3B of the lower side of the side panel 3B. Configuration of Side Formwork Panel 5 and Side Formwork Panel 5
The structure for connection to the upper and lower formwork panels 2 and 3 is the same as that of the side formwork panel 4 described above. Therefore, in FIGS. 1 and 2, for the side formwork panel 5 and the parts related thereto, the parts corresponding to the side formwork panel 4 and the parts related thereto are assigned the corresponding reference numerals in the 50's. The detailed description is omitted.

The hollow form body 10 is constructed by connecting the upper form panel 2 and the lower form panel 3 using a pair of side form panels 4, 5 as described above. As understood from the above description, the hollow form body 10 is a tubular member having an elliptical cross section. A rotating shaft 6 is provided in the hollow form body 10 along the axis thereof. As shown in FIG. 3, the rotating shaft 6 is formed by a pair of end stamps 31, 31 constituting a mold of a perforated plate (shown by a dashed line in FIG. 3) 30 to be formed. Penetrates,
A pair of support members 33 fixed to the base 32 of the formwork,
33, and a rotary handle 6 at both ends.
1 and 62 are fixed.

By rotating the rotating shaft 6, the bendable portions 44 and 45 at the respective center portions of the side form panels 4 and 5 are pulled inside the hollow form body 10 and bent to be hollow. A link mechanism 20 is provided between the rotating shaft 6 and the side frame panels 4 and 5 so that the frame body 10 can be narrowed. In the present embodiment,
The four link mechanisms 20 are provided at appropriate intervals in the axial direction of the rotating shaft 6, but the number is not limited to four.
For example, the number may be an appropriate number according to the length of the hollow mold 1.

Referring to FIGS. 1 and 2, the link mechanism 2
0 is a pair of fixed arms 21, 2 fixed to the rotating shaft 6.
2 is provided. One fixed arm 21 is provided corresponding to the side form panel 4, and one end 21 A thereof is fixed to the rotating shaft 6. The other fixed arm 22 is provided corresponding to the side form panel 5, and has one end 22A fixed to the rotating shaft 6 by an appropriate means. In the present embodiment, the pair of fixed arms 21 and 22 are attached to the rotating shaft 6 so that their respective axes extend in directions substantially orthogonal to the axial direction of the rotating shaft 6 and extend in mutually opposite directions. Fixed.

A connecting arm 2 is provided between the other end 21B of the fixed arm 21 and the corresponding bendable portion 44.
3 are linked by known means. on the other hand,
Another connecting arm 24 is similarly linked and connected between the other end 22B of the fixed arm 22 and the corresponding bendable portion 54 by a known means.

Both ends of the connecting arms 23 and 24 are pin-coupled to corresponding members so as to be able to rotate relative to each other.
As a result, by rotating the rotating shaft 6 in any direction from the position shown in FIG.
2 is rotated, and each connecting arm 23, 24 is bent freely.
4 and 45 can be pulled toward the inside of the hollow form body 10.

As described above, in the hollow mold 1, the link mechanism 20 is operated by rotating the rotating shaft 6, the hollow mold main body 10 is narrowed, and the side mold panels 4, 5 and the upper side are formed. In addition, since the lower mold panels 2 and 3 can be peeled from the cast concrete, anyone can easily perform the mold removing operation according to the hollow mold 1 without any special skill. be able to. Although each panel has flexibility, it has rigidity unlike a rubber tube, so that it can be used repeatedly and is economical.

On the other hand, the upper and lower form panels 2 and 3 and the side form panels 4 and 5 are provided with mandrels 45, 46, 55 and 56.
Are connected by a hinge connection by inserting the upper and lower formwork panels 2 and 3 and the side formwork panels 4 and 5 having different widths are prepared in advance, and appropriately prepared. By changing the shape and the surface area of the hollow portion, the shape and the surface area can be easily changed. As described above, since the surface area of the hollow portion can be increased or decreased, there is versatility, and the surface area, which was restricted in the conventional tubular form, can be freely set, and various types of perforated plates can be used. The advantage that it can be used for manufacturing can be obtained.

The perforated plate 30 having a hollow portion having an arbitrary surface area as described above can be used not only as a concrete slab but also as a material for heat storage and heat radiation.

Further, since the hollow formwork 1 having the above-mentioned structure is constituted by each formwork panel made of a rigid material such as a steel plate or a plastic, the hollow formwork 1 can be formed at the time of placing concrete as compared with a conventional tubular form. Even if buoyancy acts on the hollow form 1, deformation and torsion at an intermediate position can be significantly reduced, so that the accuracy of the dimensions and shape of the perforated plate can be significantly improved.

Next, an example of a method of manufacturing a hollow perforated plate using the hollow mold 1 having the above configuration will be described. First, as shown in FIG. 3, a pair of end stamps 31, 31 are placed on a base 32.
, And a pair of side stamping plates (not shown) are provided on both sides thereof to form and install an external formwork. Thereafter, required lower floor reinforcement is performed, and the hollow formwork 1 is attached to a predetermined position using a pair of support members 33, 33 to form a hollow portion, and then upper floor reinforcement is performed, and concrete is formed. Is installed. Although only one hollow mold 1 is shown in FIG. 3, actually, hollow molds 1 are provided in a number corresponding to the number of hollow portions to be formed in the perforated plate 30.

At the time of concrete casting, the hollow form 1 is
Each of the side form panels 4 and 5 is in a linear state (the state shown in FIG. 1), and has a substantially elliptical shape as a whole. After that, cast concrete is poured into the external formwork. In this case, the rotating shaft 6 of the hollow form 1 is connected to the pair of support members 3.
Since the bearings 3 and 33 are firmly supported, even if buoyancy acts on the hollow formwork 1 during concrete casting, the hollow formwork 1 will not rise.

Each of the formwork panels 2, 3, 4, 5 constituting the hollow formwork body 10 is made of a rigid plate material, unlike a rubber tube, though it has flexibility. Therefore, even if the buoyancy of the cast concrete acts, the torsion does not occur, and the hollow portion can be accurately formed into a desired size and shape even in the manufacture of a long perforated plate.

Then, when the cast concrete is hardened, the hollow mold 1 is released. This operation only requires rotating the rotating handles 61 and 62.
As a result, as shown in FIG. 4, the connecting arms 23 and 24 move the bendable portions 44 and 54 of the side form panels 4 and 5 inside the hollow form body 10 with the rotation of the rotating shaft 6. Pull in.
As a result, these side form panels 4 and 5 are each bent into a U-shape as shown. As the side form panels 4 and 5 are drawn into the hollow form body 10 while being bent inside, the upper form panel 2 and the lower form panel 3 are moved due to their flexibility. Is reduced, and the hollow form body 10 is narrowed. In FIG. 4, the position of the outer diameter of the hollow mold 1 when the mold for the perforated plate 30 is formed is indicated by a two-dot chain line.

As a result, all of the upper form panel 2, the lower form panel 3, and the side form panels 4, 5 are peeled off from the inner peripheral surface of the hollow portion formed by hardening concrete. This delamination occurs in upper, lower and side formwork panels 2, 3, 4, 5
Are mechanically drawn into the hollow form body 10 by the link mechanism 20, so that the mold can be easily removed without being affected by the adhesive force between the concrete and the hollow form body 10. It has become. Thereafter, the plurality of hollow molds 1 arranged to form each hollow portion are
Each of them is pulled out from the side of the perforated plate 30 and separated therefrom.

In order to facilitate this peeling, it is effective to apply a known appropriate peeling material to the outer peripheral surface of the hollow form body 10 before casting concrete. Further, each hinge connection portion of the hollow form body 10, that is, each bendable portion 44, 45 of the side form panels 4, 5, and the side form panels 4, 5 and the upper and lower form panels. Prevents cement milk from infiltrating and hardening at the joint portions of each of the hinges 2 and 3 when casting concrete, and preventing the hollow form body 10 from becoming difficult to narrow due to the rotation of the rotating shaft 6 at the time of demolding. For this reason, before concrete is poured, a suitable waterproof tape may be applied in advance along the outside of each hinge connection portion of the hollow form body 10 to prevent cement milk from infiltrating the hinge connection portion. Can be prevented, and demolding can be made easier. If a waterproof tape is attached to these hinge joints, an effect that cement milk can be reliably prevented from entering the hollow mold 1 can be expected.

In this way, one perforated plate 30 having a hollow portion can be obtained. The hollow mold 1 can be used repeatedly every time the perforated plate 30 is formed. And since this hollow form 1 is what constitutes a hollow part in required cylindrical shape using each form panel, even if it uses repeatedly, a hollow part can be shape | molded by the same opening diameter every time, The perforated plate 30 can be manufactured with high accuracy.
In addition, the manufacturing cost of the perforated plate 30 can be reduced to withstand repeated use. As a result, a high quality perforated plate can be manufactured at low cost.

[0030]

The hollow formwork of the present invention is constructed by connecting upper and lower formwork panels with side formwork panels, and by replacing each of these panels, the hollow formwork body is formed. The shape and opening diameter of the hollow part can be easily changed, and a perforated plate having various different hollow parts can be molded by appropriately deforming this hollow formwork, so that it is rich in versatility,
It is very convenient to arbitrarily form a hollow having a desired surface area. In addition, since the side form panel is drawn into the hollow form body by rotating the rotating shaft, the hollow form is easily peeled off from the surface of the hollow section after the concrete is hardened. Another advantage is that the mold can be easily removed from the perforated plate. Furthermore, since the hollow formwork after removal from the mold can be repeatedly used, the manufacturing cost of the perforated plate can be reduced, and unlike the tubular form, there is no possibility of twisting even when subjected to buoyancy due to cast concrete,
The accuracy of the size and shape of the hollow portion can be significantly improved, and a high-quality perforated plate can be obtained at low cost.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of a hollow mold according to the present invention.

FIG. 2 is a partial perspective view of the hollow mold shown in FIG.

FIG. 3 is a cross-sectional view showing a state in which the hollow form shown in FIG. 1 is set on an external form to explain a procedure for manufacturing a perforated plate using the hollow form shown in FIG. 1; Longitudinal section.

FIG. 4 is a front view showing the shape of the hollow mold shown in FIG. 1 when the mold is removed.

FIG. 5 is an explanatory view for explaining a conventional method for producing a perforated plate having a hollow portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow formwork 2 Upper formwork panel 3 Lower formwork panel 4, 5 Side formwork panel 6 Rotating shaft 10 Hollow formwork body 20 Link mechanism 21, 22 Fixed arm 23, 24 Connection arm 30 Perforated plate 32 Base 33 Supporting material 44, 54 Flexible part

Claims (4)

[Claims] 1. A hollow formwork for forming a hollow portion of a perforated plate, comprising flexible upper and lower formwork panels formed in a gutter shape and opposed to each other, and the upper and lower formwork panels. A pair of side form panels having a bendable portion along a central longitudinal direction that is hinged between both side edges of the panel and connects the upper form panel and the lower form panel. A hollow form body composed of: a rotating shaft rotatably provided along a central axis of the hollow form body; and a pair of side form panels by rotating the rotating shaft. A hole provided with a link mechanism provided between the rotation shaft and the pair of side mold panels to bend inward from a central portion to narrow the hollow mold body. Hollow formwork for forming the hollow part of the plate. 2. The side form panel according to claim 2, wherein the link mechanism corresponds to a pair of fixed arm members each having one end fixed to the rotation shaft, and the other end of each of the pair of fixed arm members. 2. A hollow formwork for forming a hollow portion of a perforated plate according to claim 1, further comprising a connecting arm connected to said bendable portion. 3. The hollow shaft main body is configured to be rotatably supported by support members disposed near both ends in the axial direction of the hollow form body. Hollow formwork for forming the hollow part of the perforated plate. 4. A perforated plate for forming a hollow portion according to claim 1, wherein a plurality of said link mechanisms are provided at appropriate intervals along an axial direction of said rotary shaft. Hollow formwork.