JPH11148226A - Concrete form and its fastening bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete form with a lighter weight and many times for conversion to obtain a homogeneous concrete structure and a fastening bracket used in assembling the form. SOLUTION: In a concrete form which is integrally molded out of thermoplastic resin reinforced by a glass fiber mat, a reinforcing edge material 2, an intermediate reinforcing material 4 with a almost the same height as that of the edge material 2 and a plane reinforcing rib 5 lower than the edge material 2 are arranged on four peripheries of the plane 1 of the form. in the longitudinal direction inside surrounded by the edge material 2 and on the plate 1 surrounded by the edge material 2 and the intermediate reinforcing material 4, respectively. A fastening hole 3 and a drain hole 7 are provided on the side face of the edge material 2 and in the reinforcing rib 5, respectively. An insert portion, a contact portion in a U-shape, an operation portion connected to the contact portion and an approximately gate-shaped holding member to hold the edge material for the form in the operation portion constitute a fastening bracket for the form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete and practically usable concrete formwork and formwork assembly which is used in civil engineering, building construction and the like and is made of a lightweight, highly durable thermoplastic resin. Related to fasteners sometimes used.

[0002]

2. Description of the Related Art Conventionally, wooden forms (plywood) and steel sheets have been mainly used as concrete formwork materials in construction work, but recently, environmental destruction due to random cutting of timber in a tropical forest region has been serious. Various alternatives to wooden formwork have also been proposed for the purpose of preventing waste of wood (tropical timber). For example, Japanese Utility Model Laid-Open Publication No. Sho 59-148839 proposes a mold formed of a synthetic resin for FRP, and Japanese Utility Model Laid-Open Publication No. Sho 62-40142 discloses a cross section for reinforcing with a thermoplastic resin reinforced with a glass fiber mat. Concrete forms that have been integrally molded until now have been proposed. In these molds, there is no need to perform a smoothing treatment of a flat portion serving as a concrete casting surface and a special treatment for improving releasability, which are required for a conventional wooden or steel plate mold.

[0003]

When a plywood plywood, for example, is used as a concrete formwork, the durability is inferior due to corrosion and breakage at the time of dismantling.

[0004] A formwork processing site is required on site.

[0005] At the time of dismantling, it is necessary to close the plywood nails with nails.

[0006] Since the releasability is poor, the concrete finished surface is poor, and the number of times of diversion is low. Therefore, it is necessary to manufacture and replenish the mold every time. There is a drawback that it is difficult to dispose of it as industrial waste because it cannot be recycled.

Further, in the case of a steel mold, the above-mentioned disadvantages are somewhat solved, but handling becomes difficult due to its weight, and it is necessary to assemble and disassemble the mold using a crane or the like. And the installation space for cranes and the like must be secured in a narrow site.

On the other hand, the problem of the FRP molds that have been conventionally proposed is that, first of all, the weight of the molds that can be easily handled by one worker can be achieved while securing necessary and sufficient rigidity. (There is a conflict between demands for weight reduction and securing rigidity, so harmony between the two is the key.) Secondly, in the transition stage where the worker switches from the plywood form to the FRP form, which the worker is familiar with,
It is necessary to mix the plywood formwork and the FRP formwork from the viewpoint of avoiding confusion of the formwork assembling work and preventing a reduction in work efficiency. In such a case, it is important for the switching to be performed smoothly that the hardware such as the separator used in the conventional plywood mold can be used as it is in the FRP mold. At the actual site, it is extremely difficult to prepare and use these hardware separately for the plywood formwork and the FRP formwork, and if this is forced, the work is rather complicated and the work efficiency is reduced. It will be done. However, in the conventionally proposed FRP formwork, the hardware such as the separator used in the plywood formwork is diverted to the FRP formwork as it is (also used).
Since practical considerations were lacking, it has not yet been put into practical use.

In assembling such concrete forms, U clips are often used to fasten the forms (see, for example, Japanese Utility Model Publication No. 49-38339).
Due to the special structure of the clip, the operating portion also serves as a holding portion for holding the rim of the formwork, so that mounting and removing the clip is troublesome and a sufficient fastening force cannot be obtained. .

The present invention has been made in view of the above problems and provides a strong concrete formwork assembly structure having sufficient strength and rigidity even in an assembled state, in combination with the necessary and sufficient strength and rigidity of a sufficiently lightweight formwork itself. It is an object of the present invention to provide a concrete formwork that can be truly put to practical use and a fastener for the concrete formwork.

[0011]

In order to achieve the above object, a first aspect of the present invention is to provide a concrete formwork integrally formed of a thermoplastic resin reinforced with a glass fiber mat, and a reinforcing rim is provided on four sides of the formwork. And erecting an intermediate reinforcing material having the same height as the reinforcing edge material at a predetermined interval in at least a short direction of the back surface of the formwork surrounded by the reinforcing edge material, and vertically standing on the backside of the formwork, Plate-shaped reinforcing ribs having a certain width shorter than the intermediate reinforcing material and projecting in the thickness direction from the rear surface of the formwork are provided on the back surface of the mold surrounded by the reinforcing edge material and the intermediate reinforcing material. A concrete formwork characterized in that the form face plate and the reinforcement ribs constitute a plate-like reinforcement rib having a predetermined thickness.

A second aspect of the present invention is a metal fitting for fastening concrete forms to each other, the insert section, the abutting section and the operating section connected to the abutting section, and reinforcement of the concrete form. A substantially gate-shaped clamping member for clamping the rim material, wherein the insertion portion, the contact portion and the base end of the operation portion have a substantially U-shape, and are obliquely downward with respect to the operation portion. The connecting portion and the insertion portion are continuously formed by being inclined, and the top surface portion of the portal-type clamping member is joined directly below the operating portion and extended from the clamping member, and the portal-type clamping is performed. A fastener for a concrete formwork, characterized in that the distance between the two leg portions of the member is reduced as it goes downward and is expanded again at the tip.

According to a third aspect of the present invention, there is provided a metal fitting for fastening concrete forms to each other. The metal fitting includes an insertion portion, a locking member rotatably provided at a tip end of the insertion portion, and a connecting portion connected to the insertion portion. A fastening fitting for a concrete formwork, comprising: an operation section, wherein the operation section is bent in a substantially inverted S-shape to form a pressing contact portion which slides on a reinforcing edge material of a formwork of the operation section. .

[0014]

In the construction of the concrete formwork, since the entire formwork including the reinforcing bar is integrally formed of a thermoplastic resin, the mold form is excellent in mold releasability and durability, and the number of times of diversion is large, and it is lightweight. The following functions are also achieved while the functions derived from the material surface, such as easy handling during transportation, assembly, and disassembly, are provided.

Due to the structural combination surrounding the separator holes of the reinforcing edge material or the intermediate reinforcing material, there is no problem even if the formwork is used in the vertical direction or the horizontal direction, and it is possible to cope with various concrete structures. In addition, since it is configured as a plate-shaped reinforcing rib, the separator hole can be provided at an arbitrary position on the plate-shaped reinforcing rib with sufficient weight reduction. Connection work can be performed without difficulty. Furthermore, by setting the total thickness of the form face plate and the plate-shaped reinforcing ribs to be the same as the thickness of the conventional plywood formwork, the hardware used for the conventional plywood formwork can be diverted, and Does not affect gender.

With the above-mentioned fastening fitting, the fastening operation can be easily performed by using the operation part, and a sufficient fastening force can be obtained. Especially,
In the fastener according to the second aspect, since the distance between the tips of the legs of the gate-type clamping member is widened, even when the end surface of the reinforcing edge of the mold is slightly deformed inward, the mold is assembled. Can be sandwiched from above, and the molds can be firmly fixed to each other. In addition, since the top surface of the clamping member is joined directly below the operation unit, a strong fixing force is obtained when the clamping member is reinforced and thus the mold is fastened, and the necessary and sufficient strength of the mold itself is obtained. -In combination with the rigidity, it is possible to provide the mold assembly with sufficient strength and rigidity as a whole. In particular, claim 3
In the fastening hardware of the above, the fastening hardware can be accommodated in the mold in the fastening state.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a perspective view showing an embodiment of a concrete form according to the present invention, and FIG. 2 is a perspective view showing a concrete form according to another embodiment. These figures show the structure on the back surface side of the formwork. The front surface side corresponds to the concrete casting surface side, and this portion is formed on a smooth flat surface portion 1. The formwork of the present invention is integrally formed of a thermoplastic resin reinforced with a glass fiber mat, and does not use any wood.

In the concrete form shown in FIG. 1 (a), a reinforcing rim 2 is provided upright around four sides of a rectangular flat portion (form face plate) 1, and the side of the reinforcing rim 2 is formed with a form. A fastening hole 3 for assembly is provided. From the viewpoint of strength, intermediate reinforcing members 4 having the same height as the reinforcing edge members 2 are provided at regular intervals in the short direction, and reinforcement is provided in a plane section surrounded by the reinforcing edge members 2 and the intermediate reinforcing member 4. A plate-shaped reinforcing rib 5 shorter than the edge member 2 is formed in a cross shape so that its thickness direction protrudes from the mold face plate. That is, a plate-shaped reinforcing rib 5 having a fixed width is provided so as to project in the thickness direction from the back surface of the mold, and the plate-shaped reinforcing plate 5 and the reinforcing rib 5 have a plate-shaped reinforcing rib having a predetermined thickness. It is configured as a rib. Therefore, compared to providing a high rib such as the intermediate reinforcing member 4, it is possible to contribute to much lighter weight. In addition, for example, if the total thickness of the form face plate 1 and the flat reinforcing ribs 5 is set to be the same as the thickness of the conventional plywood form, the separator used in the conventional plywood form can be used. Can be diverted (in other words, it becomes commonality of hardware). When transitioning from plywood formwork to the formwork of the present invention,
In the transitional period, since the work is mixed with the plywood formwork, the work can be efficiently performed and the switching can be smoothly performed as in the related art without the confusion of the work due to the common use of the hardware. And, this flat reinforcing rib 5
A separator mounting hole 6 is formed at the center of the cross. Since the reinforcing ribs 5 are formed in a flat plate shape having a certain width, the separator mounting holes 6 can be provided, so that the facing forms can be fastened at this position,
The rigidity of the formwork panel in this portion can be reduced, and as a result, the formwork itself is reduced in weight. The separator mounting hole 6
Is used to interpose and fix a rod-shaped separator between the molds forming the concrete placing space when assembling the molds. As shown in FIG.
On both sides of the reinforcing rim 2, that is, both sides (at least one side) of the reinforcing rim 2 of the extension line passing through the separator mounting hole 5.
Are provided with fastening holes 3 on the side surfaces of the holes. This is because, at the time of assembling the form, the butter, which is a reinforcing material for the entire form assembling structure, is installed in the horizontal direction by utilizing the separator mounting holes 6, and the fittings A to be described later on both sides of the butter are provided. Or C for fastening. Since the fastening holes 3 are similarly arranged not only in the longitudinal direction of the form but also in the transverse direction, there is no problem even if the form is used in the lateral direction. When used in the lateral direction, the span between the reinforcing edges is very large, and this alone causes the formwork to flex.
Therefore, the intermediate reinforcement works effectively. That is, in this use mode, since the butter is installed so as to cross the intermediate reinforcing member, the intermediate reinforcing member is supported by this. Thus, the intermediate reinforcement is at the same height as the reinforcement edge.

A drain hole 7 is provided in a plane section surrounded by the reinforcing edge member 2, the intermediate reinforcing member 4 and the flat reinforcing ribs 5. The drain hole 7 quickly drains water (concrete surplus water) and air which have a bad influence on the quality mixed in the poured concrete at the time of placing the concrete, and the head pressure of the poured concrete as a lateral pressure. This is to reduce the pressure by releasing the pressure so that the mold is not directly applied. As a result, a high-quality concrete structure can be obtained, and the scantling of the formwork can be reduced by reducing the pressure. As a result, the weight of the formwork can be reduced. As shown in FIG. 1 (b), the shape of the drainage hole 7 is composed of a circular portion 7a and a diameter increasing portion 7b which gradually increases in diameter and opens toward the back side of the formwork. Even if concrete is clogged in the drain hole 7, it can be easily removed by hitting the mold after dismantling the mold.

In the above embodiment, the flat reinforcing ribs are provided in a cross shape. However, depending on the size of the panel, the reinforcing ribs 5 in the longitudinal direction may be replaced with the same as the intermediate reinforcing members 4, or the strength may be reduced. If there is no problem, the reinforcing ribs in the longitudinal direction may be omitted only by the reinforcing ribs 5 parallel to the intermediate reinforcing member 4 as in the form of the embodiment of FIG. In the embodiment of FIG. 2, the spacing L between the separators to be installed to secure the casting space is set.
Shows an example in which the arrangement interval of the intermediate reinforcing member 4 is narrowed at both ends in order to make it even between adjacent molds (when there is a mold to be connected in the longitudinal direction in the figure). I have. It is to be noted that the same components as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The concrete formwork is a modular unit panel. A large number of these formworks are assembled on site to form a concrete casting space, and concrete is poured into this casting space, and after curing. The concrete form is dismantled. Unlike the wooden form, the formwork of the present invention has the advantage that it is durable, has a large number of diversions, is recyclable and does not become industrial waste, and, unlike the wooden or steel formwork, is lightweight and can be handled easily. It is very simple and easy to transport and organize, as well as easy to disassemble.

FIG. 3 is a perspective view of a fastener A used to fasten the concrete forms when assembling the concrete formwork, and FIG. 4 is a perspective view showing a state of fastening. The fastening member A includes an insertion portion 8 that is inserted into the fastening hole 3 of the formwork, a contact portion 9 that contacts the side surface of the reinforcing edge member 2 that follows the insertion portion 8, and an operation portion 10 that is connected to the contact portion 9. A gate-shaped sandwiching member 1 for sandwiching the reinforcing rim 2 integrally attached to the operation unit 10
It consists of 1. The insertion section 8, the contact section 9, and the base end of the operation section 10 have a substantially U-shape, and the contact section 9 and the insertion section 8 are inclined obliquely downward with respect to the operation section 10. Is formed. The holding member 11 has a gate shape as a whole including a mounting flat portion 11a and legs 11b connected to both sides thereof. It is bent outward and the space is expanded again. The top surface of the portal-type sandwiching member 11, that is, the mounting flat portion 11 a, is fixedly joined directly below the operation unit 10, and the distal end of the operation unit 10 extends from the sandwiching member 11. Therefore, as shown in FIG.
The reinforcement rims 2 and 2 are laid over the combined reinforcement rims 2 and easily fitted from above, and the reinforcement rims 2 and 2 are tightened from the side at the portion where the interval between the legs 11b is narrow. Further, since the distance between the tips of the legs 11b of the gate-type clamping member 11 is widened, even if the end surface of the reinforcing edge member 2 of the form is slightly deformed inward, the two parts when the form is assembled are The reinforcing edge can be sandwiched from above, and the molds can be firmly fixed to each other. In addition, since the top surface of the holding member 11 is joined directly below the operation unit 10, a strong fixing force is obtained when the holding member is reinforced and thus the formwork is fastened. The mold assembly can have sufficient strength and rigidity.

Here, based on FIG. 4 and FIGS. 5 (a) to 5 (c),
The procedure for fastening concrete forms using the fastening fitting A will be described. FIGS. 5 (a), 5 (b), and 5 (c) are a side view, a plan view, and a front view, respectively, in a fastened state.

First, reinforcing edge 2 of two concrete forms
And set them so that both fastening holes 3 coincide with each other. 4 and 5 (a), in a state where the fastener A is erected, the insertion part 8 of the fastener is inserted into the fastening hole 3 of the form until the contact part 9 contacts the side surface of the reinforcing edge member 2. insert. Then, the gate-shaped sandwiching member 11 comes to be right above the two reinforcing edge members that overlap. Therefore, the clamping member 11
When the operating portion 10 of the portion extended from the upper portion is hit from above with, for example, a hammer, and turned downward around the insertion portion 8, the holding member 11 sandwiches the reinforcing edge members 2 and 2 and further pushes down. When the interval between the legs 11b is partially reduced, the reinforcing edge members 2, 2 are tightened. The metal fitting A is fixed at the position indicated by the solid line in FIG. In this example, the clamping member 1
1 sandwiches the edge member 2 at a right angle, so that a sufficient fastening force can be obtained. Further, since the operation member 10 is provided, the fastening operation is simplified. As shown in FIGS. 5 (a) and 5 (c), in this fastening A, the operating part 10 is positioned on the reinforcing edge member 2 and is protruded from the form. In addition, the metal fittings are removed by hitting the operation unit 10 with a hammer in the opposite direction to the above and rotating while holding the holding member 11.
After removing the insertion part 8 from the edge member 2, the operation part 10 may be grasped and the insertion part 8 may be pulled out from the fastening hole.

FIGS. 6 and 8A are perspective views showing other two embodiments of the fastening fitting.

The main purpose of providing the fastening fittings B and C is to prevent the fastening fitting A from protruding outside the formwork and obstruct the square pipe (flap) provided on the back side for fixing the formwork when assembling the formwork. The point is to eliminate.

In the fastening member B shown in FIG. 6, a notch groove 13 is provided at the tip of a linear insertion portion 12, and a plate-like locking member 14 is inserted into the groove 13 and inserted with a pin 15. The locking member 14 is fixed to the pin 15
Is rotatable around the support shaft. Following the insertion section 12, an operation section 16 bent in a substantially inverted S-shape is formed. The bending part (pressing part) 16a of the operation part 16 is processed so as to be flat. FIGS. 7 (a) to 7 (c) show how the metal fitting B is used for fastening. First, FIG.
As shown in (a), the fitting B is moved from the imaginary line position to the position where the entire locking member 14 projects by inserting the insertion portion 12 into the fastening hole 3 of the reinforcing edge member 2 of the formwork. The locking member 14 is rotated into a cross shape as shown in c). Next, after the operating portion 16 is pulled back to a position where the locking member 14 hits the side surface of the edge member 2, the operating portion 16 is hit downward with a hammer or the like to rotate downward, and as shown in FIG. 16a
Slidably contacts the side surface of the edge material 2 and tightens the edge material from the side surface. In this example, the operating portions 16 of the metal fittings do not protrude from the edge material 2, that is, the molds are fastened to each other in a state where they are accommodated in the molds. Therefore, it is possible to freely arrange a square pipe (flap) for fixing the concrete formwork.

In the metal fitting shown in FIG.
The point that the locking member 14 is rotatably provided by the pin 15 is substantially inverted S-shaped like the above-mentioned metal fitting B, but strictly speaking, the semi-circular portion 17 connected to the insertion portion 12 Pressing part 1
The shape is slightly different in that a V-shaped operating portion 19 having 8 is provided. In this embodiment, the distance b (see FIG. 8 (b)) from the insertion position to the pressing portion 18 is shorter than the distance a (see FIG. 7 (b)) of the metal fitting B in FIG. There is an advantage that large bending is not applied. As can be seen from FIGS. 8 (b) and 8 (c), the fastening procedure of the metal fitting C is as follows.
This is the same as the case of the fitting B in FIG.

[0030]

Effect of the Invention In the configuration of the concrete formwork of the present invention, since the entire formwork including the reinforcing bar is integrally formed of a thermoplastic resin, it is rich in releasability and durability and frequently used, and Since it is lightweight, it can be easily handled during transportation, assembly, disassembly, and the like, and the following effects can be obtained while exhibiting the effects derived from the material side.

A) Due to the structural combination surrounding the separator holes of the reinforcing rim or intermediate reinforcing material, there is no problem even if the formwork is used in the vertical or horizontal direction, and it can flexibly cope with various concrete structures. Thus, the versatility and practicality of the mold of the present invention can be improved.

B) Since the plate-shaped reinforcing rib is formed, the weight can be sufficiently reduced, and the separator hole can be provided at an arbitrary position on the plate-shaped reinforcing rib. All the joining operations can be performed without difficulty, and the efficiency of the formwork assembling operation can be improved.

C) If the total thickness of the mold face plate and the flat reinforcing ribs is set to be the same as the thickness of the conventional plywood mold,
The hardware used in the conventional plywood formwork can be diverted as it is (that is, the hardware is shared). Even when transitioning from plywood formwork to the formwork of the present invention, since it is mixed with plywood formwork in the transitional period, work can be done efficiently as before without confusion of work due to the common use of such hardware Switching can be performed smoothly. This, as a result, facilitates the practical use of the mold of the present invention.

With the fastening fitting of the present invention, the fastening operation can be easily performed using the operation unit, and a sufficient fastening force can be obtained. In particular, in the fastener according to the second aspect, since the distance between the distal ends of the legs of the gate-type clamping member is widened, even if the end surface of the reinforcing edge of the mold is slightly deformed inward, the mold is assembled. In this case, the two reinforcing edge members can be sandwiched from above, and the molds can be firmly fixed to each other. In addition, since the top surface of the clamping member is joined directly below the operation unit, a strong fixing force is obtained when the clamping member is reinforced and thus the mold is fastened, and the necessary and sufficient strength of the mold itself is obtained. -In combination with the rigidity, it is possible to provide the mold assembly with sufficient strength and rigidity as a whole. In particular, in the fastener according to the third aspect, the fastener can be accommodated in the mold in the fastened state.

[Brief description of the drawings]

FIG. 1 is a perspective view of a concrete formwork according to an embodiment of the present invention.

FIG. 2 is a perspective view of a concrete formwork according to another embodiment.

FIG. 3 is a perspective view of a fastener used when assembling the concrete formwork of the present invention.

FIG. 4 is a perspective view of a state where a concrete formwork is fastened using the fastening fitting.

5 (a) to 5 (c) are a side view, a plan view, and a front view showing a fastening procedure using the fastener.

FIG. 6 is a perspective view showing another embodiment of the fastener.

FIGS. 7 (a) and 7 (b) are a front view, a plan view, and
(c) is a front view of the fastening state.

FIG. 8A is a perspective view showing still another embodiment of the fastening fitting, and FIGS. 8B and 8C are a plan view and a front view in a fastening state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flat part (form frame surface plate) 2 ... Reinforcement rim material 3 ... Fastening hole 4 ... Intermediate reinforcement material 5 ... (flat) reinforcing rib 6 ... Separator mounting hole 7 ... Drainage hole A, B, C ... Fastening fitting DESCRIPTION OF SYMBOLS 8 ... Insertion part 9 ... Contact part 10 ... Operation part 11 ... Clamping member 16a ... Bend part (press contact part) 18 ... Press contact part

Claims (3)

[Claims] 1. A concrete formwork integrally molded with a thermoplastic resin reinforced with a glass fiber mat, a reinforcing rim is erected around the periphery of the formwork, and a reinforcing rim is surrounded by the reinforcing rim. An intermediate reinforcing material having the same height as the reinforcing edge material is erected perpendicularly on the form back surface at least at predetermined intervals in the short direction, and on the form back surface surrounded by the reinforcing edge material or the intermediate reinforcing material. A flat reinforcing rib having a certain width shorter than the intermediate reinforcing member and having a thickness direction projecting from the backside of the formwork, and forming a predetermined thickness with the formwork face plate and the reinforcing rib. A concrete formwork configured as a plate-shaped reinforcing rib having. 2. A metal fitting for fastening concrete forms to each other, comprising: an insertion portion, an abutting portion, an operating portion connected to the abutting portion, and a reinforcing frame of the concrete form. The insertion portion, the abutting portion and the base end of the operating portion have a substantially U-shape, and are inclined obliquely downward with respect to the operating portion to form a corresponding contact portion. An insertion portion is continuously formed, and a top surface portion of the portal-type clamping member is joined directly below the operating portion and extended from the clamping member,
A fastener for a concrete formwork, wherein the distance between the two legs of the portal-type clamping member is reduced as it goes downward, and the tip is widened again. 3. A metal fitting for fastening concrete forms to each other, comprising: an insertion portion; a locking member rotatably provided at a tip of the insertion portion; and an operation portion connected to the insertion portion. A fastening part for a concrete formwork, wherein the operation part is bent in a substantially inverted S-shape to form a pressing contact part which slides on a reinforcing edge material of a formwork of the operation part.