JP4674897B2 - Formwork support and seat for formwork support used therefor - Google Patents

Description

  The present invention relates to a formwork support for supporting a formwork and the like used in constructing a reinforced concrete structure at a predetermined interval, and a seat for the formwork support used therefor.

  In general, a reinforced concrete structure is constructed by placing concrete between molds placed facing each other. However, when constructing a part such as a veranda where the rising wall is formed on the slab, the formwork for the slab is only present on the lower side supported by a support work or the like. Therefore, of the rising wall molds that are installed opposite to each other, the molds located on the inner side must be installed in a floating state with respect to the lower molds in order to ensure a predetermined slab thickness. I must. Therefore, to prevent the formwork inside the rising wall from sinking, formwork supports that are fitted with seats to be fixed to the formwork at both ends of the appropriate length of the rod, After the installation, the veranda was built by placing concrete.

  When the conventional formwork support is installed between the formwork, the nail is driven into the insertion hole provided in the seat so that the head of the nail is hooked on the seat. Fixed. Therefore, after placing the concrete in the formwork and removing the formwork, the nail hanging on the seat stays in the slab, and a part of the nail protrudes from the upper and lower surfaces of the slab. Become. Therefore, when finishing the slab surface, the nail protruding from the slab surface is removed by pulling out the nail itself or cutting the protruding nail with a cutting machine or the like. However, when removing the nail from the slab in this removal operation, the head of the nail is hooked on the seat, so the nail is pulled out and the seat is destroyed. And the concrete around the seat was collapsed. Therefore, it was necessary to repair the slab surface after pulling out the nail. On the other hand, when cutting a protruding nail using a cutting machine or the like, there are problems such as rust prevention because the cut surface of the nail is exposed on the slab surface. It was very dangerous because it was a work at a place. For these reasons, the removal of the nail protruding from the slab surface or the like has significantly deteriorated the workability on site.

Therefore, in order to solve these problems, a technique of fixing to each mold using a plastic nail provided on a seat for a mold support is disclosed (Patent Document 1). The formwork support described in Patent Document 1 is fixed to the formwork at the same time as the formwork is removed by using a plastic nail that is strong in the axial direction and brittle in the lateral direction. The nail that had been broken is broken at the boundary between the formwork and the concrete frame, and a part of the nail does not protrude from the surface of the concrete frame.
Utility Model Registration No. 3052622

  However, since the above-mentioned formwork support is provided with a plastic nail in advance in the seat body, there is a problem that if the plastic nail breaks during transportation or while the nail is driven into the formwork, it cannot be fixed to the formwork. It was. Moreover, since the plastic nail is more expensive than a commonly used iron nail, the cost of the seat itself has also increased. Further, when the mold is removed, in order for the plastic nail to break at the boundary between the mold and the concrete frame, it is necessary to apply a force in the direction of the concrete surface to the mold relative to the axial direction of the nail. However, since the formwork installed on the lower surface side of the slab and the like is removed while applying a force toward the lower side (the axial direction of the nail), the plastic nail does not break and protrudes from the surface of the concrete frame. It was. In addition, since the seat body is provided with a nail hole sleeve for holding the plastic nail, it is impossible to pull out only the protruding nail without destroying the seat body. Furthermore, when the plastic nail is broken at the boundary between the formwork and the concrete frame, one of the broken plastic nails remains inside the removed formwork, so that the formwork cannot be diverted. There were drawbacks.

  The present invention has been made in view of the above-described problems of the prior art, and is not limited to the material of the fixing member having a head such as a nail, and the fixing member is hooked on the seat. A formwork support that can be removed from the formwork and that can be easily pulled out without breaking the seat and surrounding concrete after the formwork has been removed, and the concrete support around it. An object of the present invention is to provide a seat for a formwork support tool to be used.

In order to solve the above-mentioned problems, the present invention provides an insertion hole for a fixing member having a head such as a nail on both sides of the cylindrical portion, on the bottom plate portion provided on the other end side of the cylindrical portion that opens on one end side. The seat body formed substantially parallel to the axial center of the cylindrical portion is fitted to both ends of the rod body having an appropriate length, and the bottom plate portion of each seat body is in contact with the formwork by the fixing member. In the formwork support that is fixed and supports a predetermined space between the formwork, the insertion hole of the seat is larger in diameter than the head of the fixing member, and the head of the fixing member is located on the inner surface side of the insertion hole. A thin-walled inner flange that is hooked on the entire periphery of the inner wall protrudes over the entire inner periphery, and an outer flange on the outer surface side of the insertion hole close to the height position of the inner flange Adopted the technical means that is formed.

According to the present invention, the diameter larger than the head of the fixing member insertion hole of the fixing member formed on the seat body, the head of the fixing member to the inner surface side of that is hooked at its entire periphery A thin-walled inner flange is projected over the entire inner peripheral surface, and the outer flange is formed on the outer surface side of the insertion hole close to the height position of the inner flange, so that it has a head such as a nail. Without being limited to the material of the fixing member, the mold can be removed while the fixing member is hooked on the seat. Furthermore, since the fixing member protruding from the concrete surface after removing the formwork can be pulled out by destroying only the inner flange portion, the seat body and the surrounding concrete are not broken. Therefore, it is not necessary to repair the concrete surface after pulling out the fixing member.

According to the formwork support and formwork support for seat body used therewith of the present invention, the inner of entire circumference hooking of the head of the fixing member to the inner surface side of the insertion hole of the fixing member formed on the seat body Since the collar portion protrudes over the entire inner peripheral surface , the insertion hole itself of the fixing member can be formed as an excessive hole, and the material cost of the seat body can be reduced. Also, by forming the outer collar on the outer surface side of the insertion hole close to the height position of the inner collar, the inner collar can be reinforced by the outer collar even if the inner collar is thin. The fixing member having the head remains in the concrete together with the base for the formwork support while being hooked on the inner flange, and only the formwork can be removed. In addition, when the fixing member protruding from the concrete surface is pulled out, the outer flange fixed in the concrete acts as an anchor to resist, so that only the fixing member can be easily pulled out without breaking the seat and surrounding concrete. It is possible to improve work efficiency on site.

  The material of the seat for the formwork support according to the present invention is not particularly limited, such as mortar and ceramics. However, considering the ease of pulling out the fixing member and the shape of the seat, the material of the synthetic resin such as polyethylene is used. Is preferred. Furthermore, the rod body constituting the mold support of the present invention can use various members such as a reinforcing bar such as a deformed steel bar or a round steel, or a separator used for the mold, and the material is not only made of iron but also a synthetic resin. There is no particular question, such as a rod made of metal. Further, the insertion holes formed in the bottom plate portion of the seat body are not limited to the position and number thereof, but are respectively symmetrically about the cylindrical portion from the surface of the degree of fixation between the mold support and the mold. Preferably it is formed. The inner flange protruding from the inner surface side of the insertion hole can be provided at any position between the upper end and the lower end of the inner peripheral surface. In order to drive into the frame, the upper surface of the inner flange is protruded from the position of the upper end of the inner peripheral surface of the insertion hole where the upper surface of the bottom plate portion is the same as the upper surface of the bottom plate portion. It is desirable. On the other hand, the outer flange portion formed on the outer surface side of the insertion hole close to the height position of the inner flange portion is formed at the deepest position with respect to the concrete surface, so that the resistance force against the extraction of the fixing member is maximized. Therefore, it is optimal to form it at the upper end of the outer peripheral surface of the insertion hole. Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 are a front view and a cross-sectional view, respectively, showing a formwork support according to the present invention. As shown in the figure, the formwork support 10 of the present invention is composed of a rod 20 having an appropriate length and seats 30 fitted to both ends of the rod 20, respectively. And these seat bodies 30 are provided in the cylindrical part 31 which opened the one end side which the edge part of the rod 20 fits, and the other end side of the cylindrical part 31, and are in the state contact | abutted to the formwork. It consists of a bottom plate portion 32 to be fixed, and four rib portions 31a are provided on the outer peripheral surface of the cylindrical portion 31 from the intermediate portion to the bottom plate portion at equal intervals. Further, the bottom plate portion 32 is formed with insertion holes 33 for fixing members having heads such as nails on both sides of the cylindrical portion 31 so as to be substantially parallel to the axial center of the cylindrical portion 31. In the present embodiment, an example in which the cylindrical portion 31 of the seat body 30 is fitted to the end portion of the rod body 20 is illustrated, but for example, a male screw portion formed at the end portion of the rod body is used. The fitting means is not particularly limited, such as screwing into a female screw portion provided on the inner peripheral surface of the cylindrical portion of the seat body.

Next, in FIG. 3, when constructing a veranda where a rising wall is formed on the slab, a construction state using the mold support 10 will be described. As shown in the figure, the molds W ₁ and W ₂ of the rising wall W are provided at opposing positions, and the mold S ₁ of the slab S is disposed only on the lower surface side. Here, the mold S ₁ of the slab is supported against falling downwards by支保engineering or the like (not shown). Then, although the rising wall outer mold frame W ₁ and slabs for the lower mold S ₁ to fix them mold together with nails or the like, the rising wall inner formwork W ₂ is determined the thickness of the slab S since that, it is necessary to install in a floated against slab for the lower mold S _1. Therefore, so as not to rise wall inner formwork W ₂ sinks, via a fixing member having a head of a nail or the like (not shown), each seat support 30 of the mold support 10 rising wall after supported by fixed respectively to use the inner mold W ₂ and slabs for the lower mold S _1, to build a veranda with Da設concrete into the mold frame. In addition, the length of the rod body 20 constituting the mold support 10 is appropriately set in consideration of the thickness of the slab S. Further, in the present embodiment, the case where the formwork support is installed on the formwork of the slab and the rising wall is exemplified, but when a side groove is provided on the upper surface of the slab such as a veranda or a step at the boundary between the indoor slab and the slab of the veranda It can also be installed between a thick end corner (such as a pier) and a slab formwork used in the case where a slab occurs. Furthermore, it goes without saying that the mold support of the present invention can be applied to opposing molds.

FIGS. 4 to 6 are a plan view, a front view, and a central cross-sectional view of the center of the form support base according to the present invention. In addition, description is abbreviate | omitted about the part mentioned above in the basic composition of the seat 30 which concerns on this invention. As shown in the figure, the bottom plate portion 32 of the seat body 30 has a substantially cross shape in plan view, and in the drawing, the bottom plate portions 32 on both the left and right sides sandwiching the cylindrical portion 31 have an excessive diameter relative to the fixing member. Two insertion holes 33 are provided. Here, in the drawing, the bottom plate portions 32 on both the upper and lower sides sandwiching the cylindrical portion 31 are provided with oval concave portions 36, but the purpose is to remove an extra portion that does not affect the performance. Therefore, it does not need to be provided. In order to increase the degree of fixation with respect to the mold, an insertion hole 33 may be formed in advance at the position of the recess 36. Then, on the inner surface side of the insertion hole 33, an inner flange portion 34 on which the head of the fixing member is hooked on the entire circumference protrudes from the upper surface of the bottom plate portion 32 to a position below by the thickness of the head of the fixing member. It is installed. On the other hand, an outer flange 35 protruding outward is formed on the outer surface side of the insertion hole 33 at the upper end position of the peripheral surface portion. And the inner side collar part 34 and the outer side collar part 35 are each provided in the position close | similar in a height direction. As a result, the inner flange 34 on which the head of the fixing member is hooked is reinforced by the outer flange 35, so that it can be formed thin. The outer flange 35 according to the present embodiment is formed over the entire outer edge of the bottom plate portion 32, but may be formed only around the outer surface of the insertion hole 33. Further, the bottom plate portion of the seat body has a substantially cross shape in plan view, but is not particularly limited to the present embodiment. For example, the entire bottom plate portion or a part thereof is rectangular or circular. Other shapes can be used.

Next, FIG. 7, the seat body 30 and the slab for the lower mold S ₁ is a partial sectional view showing a state of being fixed by the fixing member N having a head of a nail or the like. Although not shown in the drawing, it is assumed that the cast concrete exists around the seat 30. As shown in the figure, the seat 30 is fixed to the mold S ₁ with the fixing member N inserted through the insertion hole 33 and the entire circumference of the head N ₁ of the fixing member being hooked by the inner flange 34. ing. The fixing member N when removing the mold S ₁ is about to be pulled in the direction (direction of the T) which the mold is removed. However, since thin-walled inner collar portion 34 is reinforced by the outer collar portion 35, the fixed member N with the seat body 30 remains in the concrete, only the mold S ₁ is removed. Furthermore, after removal of the mold S _1, when pulling out the fixing member N that protrudes from the concrete surface, to the pullout force T of the fixing member N, since the outer collar portion 35 is resisted by the anchor effect, the seat The body 30 itself does not escape from the concrete. The fixing member N is the pullout force T, it will be pulled to break the inner flange portion 34 via the head N _1. Accordingly, it is possible to easily pull out the fixing member N without damaging the seat body 30 or the surrounding concrete without being affected by the strength of the concrete placed.

  In the above embodiment, the case where the fixing member protrudes from the concrete surface after removing the formwork has been described. However, at the same time when the formwork is removed, the inner flange portion of the seat body is broken and the fixing member is pulled out. Even if there is no problem. In other words, the seat body of the above embodiment increases the force that the inner collar part breaks by pulling out the fixing member rather than the force that removes the mold, and the resistance by the outer collar part in the concrete than the force that the inner collar part breaks. Although the force is set to be larger, the force that causes the inner flange to break by pulling out the fixing member is smaller than the force that removes the formwork, and the resistance due to the outer rib in the concrete is less than the force that removes the formwork. Even if the force is set to be large, the same effect as the present invention can be obtained. For example, when a wood screw or the like is used as a fixing member having a head, the wood screw is firmly fixed to the mold compared to the nail, so that the wood screw is pulled out from the concrete together with the mold. However, even in this case, since the outer flange functions as an anchor as described above, the seat itself does not slip out of the concrete, and the concrete around the seat does not collapse. And changing the dimensions such as the height and diameter of the bottom plate part and the cylindrical part constituting the seat body, and the shape and size of the inner and outer collars respectively provided on the inner surface side and outer surface side of the insertion hole Of course, various design changes can be made within the technical idea of the present invention as appropriate.

It is the front view which showed the formwork support tool in this invention. It is sectional drawing which showed the formwork support tool in this invention. It is explanatory drawing which shows the use condition of the formwork support tool in this invention. It is the top view which showed the seat for formwork support tools in this invention. It is the front view which showed the seat for mold support members in this invention. It is sectional drawing which showed the seat for mold support members in this invention. It is a fragmentary sectional view showing the situation where the base for formwork support in the present invention was fixed to the formwork with the fixing member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Formwork support tool, 20 ... Rod, 30 ... Seat, 31 ... Cylindrical part, 32 ... Bottom plate part, 33 ... Insertion hole, 34 ... Inner collar part, 35 ... Outer collar part, N ... Fixing member, S: Slab, S1: Lower formwork for slab, W ... Rising wall, W1 ... Outer mold for rising wall, W2 ... Inner mold for rising wall

Claims (2)

Insertion holes for a fixing member having a head such as a nail are formed on both sides of the cylindrical portion substantially parallel to the axis of the cylindrical portion on the bottom plate portion provided on the other end side of the cylindrical portion that opens at one end side. The seats are fitted to both ends of the appropriate length rod, and the bottom plate of each seat is in contact with the molds and fixed by the fixing members to support the gaps between the molds at a predetermined interval. In the formwork support tool, the insertion hole of the seat is larger in diameter than the head of the fixing member, and the thin-walled shape is such that the head of the fixing member is hooked on the entire inner surface of the insertion hole. The inner flange portion of the mold protrudes over the entire circumference of the inner peripheral surface, and the outer flange portion is formed on the outer surface side of the insertion hole close to the height position of the inner flange portion. Frame support. Insertion holes for a fixing member having a head such as a nail are formed on both sides of the cylindrical portion substantially parallel to the axis of the cylindrical portion on the bottom plate portion provided on the other end side of the cylindrical portion that opens at one end side. For a formwork support that is fitted to both ends of a rod having an appropriate length and is fixed by a fixing member with its bottom plate abutting on the formwork, and supported between the formwork at a predetermined interval. In the seat body, the insertion hole is larger in diameter than the head of the fixing member, and a thin-walled inner flange portion on which the head of the fixing member is hooked on the entire inner surface side of the insertion hole. A seat for a formwork supporter, characterized in that an outer collar is formed on the outer surface side of the insertion hole close to the height position of the inner collar while projecting over the entire inner circumference. body.

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