JP2008002243A - Permanent form, form holding body therefor and form fixing anchor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent form and its form-holding body capable of easily forming a projecting curve which is undistorted to the permanent form, suppressing an appearance of a recess in the permanent form and avoiding concrete from leaking between the permanent forms while preventing a deformation and degradation in strength of a footing caused by the above. <P>SOLUTION: An insertion hole 14 for an arc guide part 15a is formed near an upper end part 11a of a sheet material 11, so that, after connecting the permanent form 10 to a rising form 12, a part of a form-shape retaining body 15 is inserted through the insertion hole 14 into an inner space of a permanent form 10 for retaining a shape of the sheet material 11 projecting in a convex shape from the inside of the sheet material 11. As a result, a recess in the permanent form 10 can be suppressed from appearing and a leakage of concrete between the adjacent permanent forms 10 can be prevented while a deformation and degradation in strength of a footing part can be avoided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a discarded formwork, a formwork holding body thereof, and an anchor for fixing the formwork, and more specifically, used when building a foundation such as a house with concrete, and a discarded formwork that is buried in the ground as it is placed and its The present invention relates to a formwork holding body that holds the shape of the formwork and a formwork fixing anchor that fixes a discarded formwork to the ground.

When building a house, foundation work is performed on the ground beforehand. As one of the construction methods, for example, using the discarded formwork and the fixing tool of Patent Document 1 previously filed by the applicant of the present application, the footing part and the rising part are made inseparable on the compacted ground. A method of placing with concrete is known.
This is because a steel rising formwork is first erected on the surface of abandoned concrete on the ground using an external support structure, and then buried at the lower end of the rising formwork. While hooking the upper end part of the made-up discarded formwork (footing formwork), the lower end part (hem part) of the discarded formwork is fixed to the ground with a jig.
At this time, the discarded mold is curved in a convex shape (a cross-sectional arc shape) with the center portion protruding outward, and the rising mold is not connected to the discarded mold using the support structure. Assembled in. Then, an inverted T-shaped reinforcing bar is placed in the formwork to pour the concrete, and then the foundation is placed by curing and solidifying it. As a result, the construction period of the foundation construction can be shortened and the construction cost can be reduced, and the cold joint can be eliminated.

Further, as a jig for fixing the lower end portion of a paper discarding mold frame to the ground, for example, a mold fixing nail whose outer diameter of the head exceeds three times the outer diameter of the trunk is known (patent) Reference 1). As described above, since the nail having a large head area is used, the lower end portion of the discard mold can be firmly fixed to the ground as compared with the case where a general nail is used.
JP 2003-336268 A

However, as described above, in Patent Document 1, a paper-made discarded form that is softer than metal is used as the footing form. Therefore, when assembling the formwork, the abandoned formwork had to be shaped manually into a circular arc shape with its center protruding outward, and the assembly work of the abandoned formwork was cumbersome and required skill .
In addition, since it is a paper-made formwork, depending on the fixed state of the metal-type start-up formwork and the formwork-disposed form with respect to the ground, the formed formwork is distorted, and a part of the formwork is recessed. Appeared and a cross-sectional defect occurred in the footing part after placing with concrete, and the strength of the footing part might be lowered. In addition, when the concave portion is generated at a joint portion between adjacent footing molds, the concrete may leak out of the mold using the concave portions as a passage when the concrete is poured into the mold.

  Further, as in Patent Document 1, as a jig for fixing the lower end portion of the paper footing formwork to the ground, even when the outer diameter of the head exceeds three times the outer diameter of the trunk portion, The diameter of the nail could not be increased until the lower end of the footing formwork could be firmly fixed to the ground due to the manufacturing technology of the nail.

Therefore, the present invention can easily perform the convex curve shaping without distortion on the discarded mold frame, thereby suppressing the appearance of the concave portion on the discarded mold frame, and between the adjacent discarded mold frames. It is an object of the present invention to provide a discarded formwork and a formwork holder that can prevent the leakage of concrete from the gap and prevent the deformation and strength reduction of the footing part due to the leak.
Another object of the present invention is to provide a mold holding body in which the upper end portion of the throwing mold is difficult to drop off from the rising part of the rising mold.
Another object of the present invention is to provide a mold fixing anchor that can firmly fix a wide range of the lower end portion of the discarded mold to the ground and can be folded compactly when not in use. .

  According to the first aspect of the present invention, the upper end portion is connected to the rising formwork for placing the concrete for the rising portion of the foundation of the building, and the bendable for placing the concrete for the footing portion of the foundation. In a discarded mold made of a sheet material, a part of the sheet material that holds the shape of the sheet material curved in a convex shape from the inside of the sheet material at a portion other than the upper end portion of the sheet material. It is a discarded formwork in which an insertion slot into which a part is inserted is formed.

  According to the discard mold according to claim 1, in the discard mold connected to the rising mold, a part of the mold retainer is inserted into the inner space of the discard mold through the insertion port, and is convex. The shape of the sheet material curved in the direction is held from the inside of the sheet material. At this time, the part (remaining part) arranged outside the insertion slot in the formwork shape holder is connected to an object other than the discarded formwork, such as a rising formwork. Thereby, the convex curve shaping without distortion can be easily applied to the discarded formwork. As a result, it is possible to suppress the appearance of the recesses in the discarded mold frame, prevent the leakage of concrete from the gap between adjacent discarded mold frames, and prevent the deformation and strength reduction of the footing part due to this leakage. it can.

The discard form may be a stop form for placing a concrete stop part, or may be a form part for placing a concrete corner part. Further, it may be a corner mold for casting a corner of concrete.
As the foundation, for example, the foundation of a building such as a house, the foundation of a bridge or a retaining wall can be cited. The foundation may be any part that is mainly constructed in the ground, transmits the load of the upper structure to a predetermined support ground, and bears a stable support function.
Types of foundations include, for example, an independent foundation that is placed one per pillar, a continuous (fabric) foundation and a composite foundation that are placed one per multiple pillars, and the entire superstructure. For example, a solid foundation is given. The placement referred to in the present invention refers to placement in which concrete is poured into a predetermined formwork and cured and solidified.
Examples of the foundation placement surface include abandoned concrete surface and a ground surface filled with pressure. Abandoned concrete may be placed directly on the ground or may be placed through a quarry stone or the like.

The material of the sheet material is arbitrary. An example is paper. However, a material having a water-blocking property is preferable because there is no leakage of concrete liquid from the sheet material itself. Examples of the sheet material having water-impervious properties include various synthetic resin sheets, laminated papers coated with various synthetic resin films, paper tube base paper, water-repellent corrugated cardboard, and water-resistant corrugated cardboard that have a small decrease in strength due to an increase in water content And water-resistant paper in which a paper material is impregnated with molten paraffin or microcrystalline wax.
The sheet material is curved in a convex shape so that the middle part of the sheet material in the width direction (height direction) protrudes outward from the mold frame from both ends in the width direction when using the discarded mold frame. To bend in an arc.
The curvature of the curved sheet material is not limited. For example, the footing height is the same as that of the Housing Finance Corporation specification, and the radius of the footing portion is about 120 to 140 mm that is equal to the housing finance Corporation specification.
The thickness of the sheet material is not limited as long as the sheet material can be bent and can retain the shape before placing even during placement. For example, it is about 0.7 to 1.3 mm.

The connection of the upper end portion of the disposal mold to the start-up mold may be a detachable connection such as a hook or a non-separable connection such as adhesion, welding, or welding.
The portion of the sheet material in which the insertion opening is formed may be, for example, the vicinity of the upper end portion, the intermediate portion in the height direction of the sheet material, or the lower end portion of the sheet material.
Examples of the shape of the insertion opening include a triangle, a polygon that is equal to or greater than a quadrangle, and an arbitrary shape.
The size of the insertion opening is arbitrary as long as the portion that is inserted into the inner space of the sheet material in the formwork shape can be inserted. The number of insertion openings is one, or two or more.

A formwork shape is a member that holds the shape of a curved sheet material from the inside, with a part being placed inside the sheet material and the rest being placed outside the sheet material through the insertion opening. It is. Therefore, the remaining part of the formwork holding body is fixed to, for example, a rising formwork or the like that serves as a mounting base for the formwork holding body.
The material for the formwork shape is arbitrary. For example, various metals such as iron, stainless steel, and aluminum, various synthetic resins such as polyethylene and polypropylene, and various trees such as cedar, oak, and pine can be employed. The formwork holding body may be an elastic body or a rigid body. A part of the form-holding body may or may not be pulled out from the form-frame after the footing portion has been placed through the insertion slot.
The shape (external shape) of the formwork holder is arbitrary. For example, a triangle or a polygon more than a quadrangle can be employed.
A part of the mold form retainer is curved with substantially the same curvature as that of the convexly curved sheet material, which increases the contact area between the mold form retainer and the sheet material, and increases stability. It is preferable.

The sheet material may be formed with a filling confirmation hole that can confirm the completion of filling of the concrete from the leakage of the concrete poured at the time of placing. It is preferable to form a plurality of filling confirmation holes at a constant pitch in the sheet material. In this way, the length of the discarded mold can be roughly recognized without using a ruler.
The size of the filling confirmation hole is such that the concrete liquid leaks to the outside and the solids such as aggregate do not leak. Specifically, the diameter is 2 to 10 mm, preferably 4 to 6 mm. If it is less than 2 mm, clogging may occur, resulting in blockage. Moreover, when it exceeds 10 mm, there exists a possibility that a mortar component may leak in large quantities.
The shape of the filling confirmation hole is arbitrary. Although it is usually circular, it may be oval or a polygon more than a triangle.
For example, the number of filling confirmation holes may be one, or two or more. When there are a plurality of filling confirmation holes, they can be formed in the sheet material at a constant pitch of about 60 mm in the vertical direction and about 151.5 mm in the horizontal direction, for example.

The footing formwork and the rising formwork are connected so that there is almost no gap. Therefore, it is possible to use a vibrator for compacting concrete when pouring concrete.
The type of concrete for placing is arbitrary. For example, ordinary Portland cement can be used.
It is preferable to mix concrete reinforcing metal fibers bent in two orthogonal virtual planes in the concrete. The amount of mixing varies depending on the use of concrete. For example, 20-40 kg / m ³ for building foundations.

The metal material which is a raw material of the metal fiber for concrete reinforcement is arbitrary. For example, pure iron, steel, mild steel, special steel, electrical steel, cast steel, cast iron, etc., which are steel materials, can be mentioned. In the case of a steel material, the metal fiber for concrete reinforcement becomes the steel fiber for concrete reinforcement. A non-ferrous metal that is relatively inexpensive and has high strength, such as an aluminum alloy, can also be used.
The type of metal fiber for reinforcing concrete is also arbitrary. For example, flat wire-type metal fibers that are long and thin plates with a rectangular cross section, long and thin metal fibers with a circular cross section, indent type metal fibers having protrusions at predetermined intervals, and bent hooks are arranged at both ends. Examples thereof include hook-type metal fibers at both ends, and corrugated metal fibers bent into a wave shape over substantially the entire length of the fiber. The surface of the metal fiber for concrete reinforcement can be covered with a rust preventive film.

  According to the second aspect of the present invention, the upper end portion is connected to the rising formwork for placing the concrete for the rising portion of the foundation of the building, and the bending is possible for placing the concrete for the footing portion of the foundation. A formwork holder that holds a discarded mold made of a sheet material in a convex curved shape from the inside of the sheet material, wherein a part of the formwork holder is the upper end of the sheet material Through the insertion opening formed in the portion excluding the portion, it is inserted into the inner space of the sheet material after bending and is brought into contact with the inner surface of the sheet material, and the remaining part of the formwork holder is placed on the rising formwork It is a formwork holder that is detachably or non-separably connected.

According to the second aspect of the present invention, in the discarded mold frame connected to the rising mold frame, a part of the mold holder is inserted into the inner space of the discarded mold frame through the insertion port, and curved in a convex shape. The shape of the finished sheet material is held from the inside of the sheet material. At this time, the remaining part of the formwork retainer is detachably or non-detachably connected to the rising formwork.
Thereby, the convex curve shaping without distortion can be easily applied to the discarded formwork. As a result, it is possible to suppress the appearance of the recesses in the discarded mold frame, prevent the leakage of concrete from the gap between adjacent discarded mold frames, and prevent the deformation and strength reduction of the footing part due to this leakage. it can.

  Examples of the method for detachably connecting the remaining part of the formwork holding body to the rising formwork include, for example, connection using a bolt and nut, connection using a clip, and connection using elastic force when the formwork shape holding body is an elastic body. Etc. can be adopted. In addition, as a method for connecting the remaining part of the formwork shape retainer to the standing formwork in an inseparable manner, for example, connection by adhesion, welding, welding, or the like can be employed.

  According to a third aspect of the present invention, the upper end portion of the sheet material is a plate piece that is hooked to an upright portion provided at a lower outer end of the rising formwork, and the remaining part of the formwork holding body is The mold holding body according to claim 2, further comprising a detachment preventing portion that prevents detachment of the upper end portion of the sheet material from the upright portion.

  According to the third aspect of the present invention, the upper end portion of the sheet material is hooked to the rising portion of the rising formwork, and this hooked state is held by the detachment preventing portion. Thereby, detachment of the upper end portion of the sheet material from the standing portion can be prevented.

For example, a lip-attached shape steel can be adopted as the rising form with the upright portion.
The structure of the stopper portion is arbitrary. For example, a clip system that clamps the upright portion and the upper end portion of the sheet material may be used, or a press method that presses the upper end portion of the sheet material covered on the upright portion from the outside by a pressing member. As the pressing member, a U-shaped member or a V-shaped member can be adopted.

  According to a fourth aspect of the present invention, an upper end portion is connected to a rising formwork for placing a concrete for a rising portion of a foundation of a building, and a bendable concrete for placing a concrete for a footing portion of the foundation. An anchor for fixing a formwork made of a sheet material, which fixes a lower end portion of the discarded mold frame to the ground, and a nail portion pierced into the ground from above the lower end portion of the discarded mold frame, and a length direction of the nail portion A ground press that is pivotably connected to a predetermined position of the nail portion about a rotation axis whose axis is perpendicular to the length direction of the nail portion, and presses the lower end portion of the sheet material against the ground from above A mold fixing anchor having a member.

According to invention of Claim 4, when fixing the lower end part of a discard mold to a ground, for example, a ground pressing member is rotated centering on a rotating shaft, and the length direction of a ground pressing member is set. Is perpendicular to the axis of the nail. Then, a nail part is pierced into the ground from above the lower end part of the discarded formwork. Thereby, the lower end part of a discard mold can be pressed against the ground in the entire length direction of the ground pressing member. As a result, a wide range of the lower end portion of the discarded mold can be firmly fixed to the ground.
When the anchor for anchoring the formwork is not used, the ground pressing member is rotated around the rotation axis, and the length direction of the ground pressing member is aligned with the axial direction of the nail, thereby making the anchor for anchoring the formwork compact. Can be folded into

The anchor for anchoring the formwork is one in which a ground pressing member that presses the lower end portion of the sheet material serving as the main body of the discarded mold frame against the ground is rotatably connected to the nail portion.
As a material for the nail portion, for example, various metals such as iron, stainless steel, hard aluminum, brass, and various synthetic resins such as polyethylene, polypropylene, vinyl chloride, ABS, and polycarbonate can be employed.
The length of the nail part is 10 to 50 cm. If it is less than 10 cm, there is a possibility that the anchor for anchoring the formwork will be pulled out during concrete placement. Moreover, if it exceeds 50 cm, a labor will be required for conveyance.
The nail portion has a diameter of 5 to 13 mm. If it is less than 5 mm, the anchor for anchoring the formwork may be pulled out during concrete placement, or the nail portion may be bent during placement (in use). Moreover, when it exceeds 13 mm, it will be too thick with respect to the lower end part of a discard mold, and there exists a possibility that a discard mold may be damaged at the time of driving.

As a material for the rotating shaft, various kinds of synthetic resins such as various metals such as iron and stainless steel, polyethylene, polypropylene, vinyl chloride, ABS, and polycarbonate can be employed.
As the material of the ground pressing member, for example, a material selected from the materials described above as the material of the nail portion can be adopted.
As the shape of the ground pressing member, for example, a round bar shape, a square bar shape, or a plate shape can be adopted.

  According to the discard form according to claim 1, since the insertion opening into which a part of the form retainer is inserted is formed in a portion other than the upper end portion of the sheet material, After connecting, a part of the formwork shape retainer is inserted into the inner space of the discarded formwork through the insertion port, and the shape of the sheet material curved in a convex shape from the inside of the sheet material is maintained. Thereby, the convex curve shaping without distortion can be easily applied to the discarded formwork. As a result, it is possible to suppress the appearance of the recesses in the discarded mold frame, prevent the leakage of concrete from the gap between adjacent discarded mold frames, and prevent the deformation and strength reduction of the footing part due to this leakage. it can.

Further, according to the formwork holder of claim 2, a part of the formwork shape is inserted into the inner space of the formwork through the insertion slot in the formwork connected to the rising formwork. The shape of the convexly curved sheet material is held from the inside of the sheet material. At this time, the remaining part of the formwork retainer is detachably or non-detachably connected to the rising formwork.
Thereby, the convex curve shaping without distortion can be easily applied to the discarded formwork. As a result, it is possible to suppress the appearance of the recesses in the discarded mold frame, prevent the leakage of concrete from the gap between adjacent discarded mold frames, and prevent the deformation and strength reduction of the footing part due to this leakage. it can.

  In particular, according to the mold holder of the third aspect, the upper end portion of the sheet material is hooked to the rising portion of the rising mold frame, and this hooked state is held by the detachment stopper. Thereby, detachment of the upper end portion of the sheet material from the standing portion can be prevented.

  Further, according to the anchor for anchoring the formwork according to claim 4, since the ground pressing member is rotatably connected to the nail portion via the rotating shaft, the sheet in the entire length direction of the ground pressing member The lower end of the material can be pressed against the ground. As a result, a wide range of the lower end portion of the discarded mold can be firmly fixed to the ground. In addition, when the anchor for fixing the formwork is not used, the ground pressing member is rotated around the rotation shaft, and the length direction of the ground pressing member is aligned with the axial direction of the nail portion, thereby fixing the anchor for fixing the formwork. Can be folded compactly.

  Examples of the present invention will be specifically described below.

In FIG. 1, reference numeral 10 denotes a bendable disposable formwork (footing formwork / straight part formwork) used when placing concrete for a footing part among foundations having a substantially inverted T-shape for housing. It is. Here, a large number of discarded molds 10 are used in a line-symmetric state around a virtual straight line on which the foundation is constructed.
As shown in FIGS. 1 to 4, the discard frame 10 has a sheet material 11 made of laminated paper as a main body. As for the sheet | seat material 11, the front and back both surfaces of paper are covered with the waterproof film. The paper size is 900 mm long, 330 mm wide, and a thickness of 0.7 to 1.0 mm. The film thickness on both the front and back surfaces is 20 μm. As a result, the sheet material 11 has a slope that gently curves with a radius of 132 mm at the time of assembling the mold, and can retain the shape before placement even during placement.

An upper end portion (one end portion in the sheet width direction) 11a of the sheet material 11 is provided so as to be bent around a fold. In addition, a pair of folded pieces 11b are disposed at the upper end portion at a predetermined pitch in the sheet length direction. The two folded pieces 11b are provided with two vertical ribs (vertical reinforcing ribs) 13 arranged on the side surface of the rising form frame 12 for placing concrete for the rising part of the foundation when the discarded form frame 10 is used. It is something to straddle.
In addition, an insertion port 14 is disposed at a position slightly below the upper end portion of the discard mold 10 at each intermediate position of the portion divided by the folded pieces 11b in the length direction of the sheet material 11. . Each insertion port 14 is a hole that is long in the length direction of the discard mold 10, and an arc guide portion 15 a of a mold retainer 15 to be described later is inserted with a slight gap around it.

Except for the upper end portion of the discard mold 10, a large number of filling confirmation holes 11c are dotted at a pitch of 151.5 mm in the sheet length direction and at a pitch of 60 mm in the sheet width direction. The filling confirmation hole 11c is a hole for confirming completion of filling of concrete from a leak of concrete poured at the time of placing. Its diameter is 5 mm.
The rising mold 12 is made of a horizontally-long rectangular stainless steel plate, and the rising outer frame 12 has an upright portion having a height of 10 mm (the upper outer end is vertically downward, The bottom outer end is vertically upward) 12a. In addition, the vertical ribs 13 and the horizontal ribs 16 are arranged on the outside of the rising form 12 in a lattice shape. The rising form 12 is placed on a plurality of support tables 17 that are spaced apart. Each support stand 17 has a P-shaped support bar 17b erected on a concrete base portion 17a.

Next, referring to FIG. 2 to FIG. 4, a mold shape holding body 15 that connects the rising mold frame 12 and the discard mold frame 10 and holds the sheet material 11 in a convex curved shape from the inside thereof. explain.
The formwork retainer 15 is made of an elastic stainless steel thin plate (width 31 mm, thickness 1 mm). The upper half of the formwork retainer 15 constitutes a flat leaf spring portion 15b having a length of 215 mm that is detachably connected to the rising formwork 12. The leaf spring portion 15b is longer than one third (200 mm) of the vertical rib 13 of the rising mold 12. The lower half of the formwork retainer 15 has a gently curved slope with the same radius of 132 mm as the discarded formwork 10, and serves as the arc guide portion 15 a that holds the sheet material 11 from the inside of the sheet material 11. ing.
Further, the end portion on the arc guide portion 15a side of the leaf spring portion 15b is a protruding portion 15c that protrudes about 17 mm outward from the connecting portion with the arc guide portion 15a. On the other hand, the vicinity of the connection portion between the arc guide portion 15a and the leaf spring portion 15b is an inclined portion 15d inclined by 60 degrees with respect to the protruding portion 15c. The projecting portion 15c and the inclined portion 15d constitute a clip portion (a locking portion) 18 that holds the upper end portion 11a of the sheet material 11 that is hooked on the standing portion 12a.

The lower end portion of the sheet material 11 is folded outward to form a bowl-shaped hem portion 11d. The skirt portion 11d is fixed to the ground 26 that has been pressed by the anchor 19 for fixing the mold (FIG. 5). Hereinafter, the anchor 19 for fixing a formwork will be described in detail with reference to FIGS.
The anchor 19 for fixing the formwork is perpendicular to the length direction of the nail part 20 at the nail part 20 pierced into the ground 26 from the top of the skirt part 11d and the middle part of the nail part 20 in the length direction. And a ground pressing member 22 that is pivotably connected around the rotating shaft 21 and that presses the bottom portion 11d against the ground 26 from above.

The nail portion 20 is a nail having a diameter of 9 mm and a length of 430 mm, and is a steel nail whose upper end portion 20a is bent at a right angle. The ground pressing member 22 is a steel round bar having a diameter of 9 mm and a length of 400 mm.
The pivot shaft 21 is fixed at the head of a bolt 23 whose axis is orthogonal to the length direction of the nail portion 20. A thick ring portion 24 is connected to an intermediate portion in the length direction of the ground pressing member 22. The ring portion 24 is inserted with a gap around the entire circumference of the bolt 23, and a pair of nuts 25 are screwed into the threaded portion of the bolt 23 protruding from the end surface of the ring portion 24. Accordingly, the ground pressing member 22 is configured to be rotatable about the bolt 23.

Next, with reference to FIG. 1, FIG. 3, FIG. 4 and FIG. 5, the usage method of the discard mold 10 which concerns on Example 1 of this invention is demonstrated.
First, abandoned concrete is placed on the ground 26. The ground 26 is preliminarily provided with a cracking territory where laying is performed in advance, a sand laying operation where sand is laid, a gravel territory where gravel is laid, and a pile driving terrain where piling is performed.
Thereafter, a plurality of support bases 17 are arranged in pairs in a state of being separated from each other on the surface of the discarded concrete, with the virtual straight line on which the foundation is constructed being axisymmetric center.
On the upper surface of each support stand 17, a plurality of raised molds 12 are assembled in a connected state with the respective length directions aligned and substantially free of gaps. Thereby, the assembled formwork 12 after assembly is arranged in two rows on both sides of the virtual straight line.

Next, the throwing mold 10 curved in a convex shape is connected to the lower end of each rising mold 12. Specifically, the upper end portion 11 a of the sheet material 11 that is folded inward is hooked to the rising portion 12 a on the lower side of the rising form 12. At that time, each folded piece 11b is folded outward to reveal the opening. Each opening is opposed to the base of the corresponding vertical rib 13.
Subsequently, the arc guide portion 15a of the corresponding mold retainer 15 is inserted into each insertion port 14 of the discard mold 10 with a slight gap around it. Thereby, the shape of the sheet material 11 curved in a convex shape is held (supported) from the inside of the sheet material 11.

The clip part 18 of each formwork retainer 15 holds the upper end part 11a of the sheet material 11 hooked on the upright part 12a. The plate spring portion 15 b of each mold shape retainer 15 is curved against its elastic force, and the plate spring portion 15 b of each mold shape retainer 15 is formed by the two vertical ribs 13 of the horizontal ribs 16. It is pressed against the lower surface of each portion divided into three equal parts with a predetermined elastic force. In this way, the shape of each sheet material 11 is held from the inside by each arc guide portion 15a in a state in which each leaf spring portion 15b is elastically hooked to the rising mold frame 12, so Therefore, it is possible to easily perform convex curve shaping without distortion. Therefore, it is possible to suppress the appearance of the concave portion in the discarded mold frame 10, prevent the leakage of concrete from the gap between adjacent discarded mold frames 10, and prevent the deformation and the strength reduction of the footing portion due to the leakage. Can do.
Moreover, since the upper end part 11a of the sheet | seat material 11 is latched to the said standing part 12a, and this latching state is hold | maintained by the clip part 18, it can prevent that the upper end part 11a remove | deviates from the standing part 12a.

  Further, at the time of assembling each discarded mold 10, the hem 11 d of each sheet material 11 is fixed to the ground 26 using a plurality of mold fixing anchors 19. In particular, it is more effective to use it for fixing between the skirts 11d of the adjacent double-sided molds 10 because the gaps between the sheet materials 11 can be prevented. Specifically, the ground pressing member 22 is rotated around the rotation shaft 21, and the length direction of the ground pressing member 22 is orthogonal to the axis of the nail portion 20.

Thereafter, the nail portion 20 is pierced into the ground 26 from above the lower end portion of the discard mold 10. Thereby, the bottom part 11d can be pressed against the ground 26 by the whole length direction of the ground pressing member 22. As a result, it is possible to firmly fix the wide range of the skirt portion 11d of the discard mold 10 to the ground 26.
When the anchor 19 for fixing the mold is not used, the ground pressing member 22 is rotated around the rotation shaft 21, and the length direction of the ground pressing member 22 is aligned with the axial direction of the nail portion 20. The anchor 19 for fixing can be folded compactly.

Next, from the upper end opening between the rising molds 12, the footing part placement gap formed between the facing discarded molds 10 and the standing formed between the facing rising molds 12. Pour concrete into the raised part casting space. At that time, a rod-like vibrator is inserted, the concrete is fluidized, voids in the concrete and unnecessary moisture are eliminated, and the concrete is compacted firmly in the mold. This increases the durability of the foundation. At that time, as described above, there is almost no gap in the connecting portion of the discarded mold 10. Therefore, there is almost no possibility that the concrete leaks from the connecting portion of the mold 10.
During the pouring of the concrete, a part of the air inside the footing portion placing gap and the air contained in the concrete are smoothly discharged out of the mold through the filling confirmation hole 11c. As a result, air is collected on both end portions bulging outward such as the discarded mold 10 and the possibility that the strength of the footing portion placed by concrete is reduced is reduced.

In particular, as in the first embodiment, when the discard mold 10 is made of a bendable sheet material 11, depending on the degree of flexibility of the sheet material 11, the entire discard mold 10 or a part thereof. There is a possibility that large and small irregularities appear on the surface, and the air accumulation portion frequently occurs. However, each discarded mold 10 has a slope that gently curves when the mold is assembled, has a hardness that can retain the shape before placing, and the arc guide of each form retainer 15. Since the shape of the sheet material 11 is held from the inside by the portion 15a, there is no possibility that unevenness (particularly a dent) appears. Moreover, the air in the concrete can be extracted out of the mold from the nearby filling confirmation hole 11c.
Thereafter, the worker visually confirms the leakage of the concrete from the filling confirmation hole 11c, so that the concrete is filled up to the portion where the filling confirmation hole 11c is formed in the gap in the footing portion placement. It is easy to know.

  After pouring the concrete, leave it for a predetermined time to cure and solidify the concrete. Thereafter, by removing the mold, a foundation including a footing portion and a rising portion is obtained on the discarded concrete. At this time, the sheet-shaped discarding mold 10 can be used for curing the subsequent concrete by leaving it without being peeled off from the surface of the footing part. Further, after the placement, the leaf spring portions 15 b are removed from the respective lateral ribs 16, and the corresponding arc guide portions 15 a are pulled out through the insertion openings 14. As a result, the formwork retainer 15 can be reused.

It is a perspective view which shows the construction state of the foundation using the discard mold form which concerns on Example 1 of this invention. It is a perspective view of the formwork holder concerning Example 1 of this invention. It is a perspective view which shows during the assembly | attachment operation | work to the stand-up formwork of the discard formwork which concerns on Example 1 of this invention. It is a perspective view from the back direction which shows the construction state of the foundation using the discard mold form which concerns on Example 1 of this invention. It is a perspective view which shows the use condition of the anchor for mold fixing which concerns on Example 1 of this invention. It is a front view of the use condition of the anchor for mold fixing which concerns on Example 1 of this invention. It is a side view of the use condition of the anchor for a formwork which concerns on Example 1 of this invention.

Explanation of symbols

10 Abandoned formwork,
11 Sheet material,
11a upper end,
12 Launch formwork,
12a Standing part,
14 insertion slot,
15 formwork shape,
18 Clip part (detachment prevention part),
19 Anchor for fixing formwork,
20 nails,
21 pivot axis,
26 Ground.

Claims (4)

In a discarded formwork made of a bendable sheet material, the upper end of which is connected to a start-up formwork for placing concrete for a start-up part of a building foundation, and the concrete for a footing part of the foundation is placed. ,
An insertion opening is formed in a portion of the sheet material excluding the upper end, into which a part of the formwork holding body that holds the shape of the convexly curved sheet material from the inside of the sheet material is inserted. Discarded formwork. An abandoned formwork made of a bendable sheet material, the upper end of which is connected to a start-up formwork for placing concrete for a start-up part of a building foundation, and a concrete for the footing part of the foundation is placed. , A mold holding body that holds the convex curved shape from the inside of the sheet material,
A part of the formwork holder is inserted into the inner space of the sheet material after bending through an insertion port formed in a portion of the sheet material excluding the upper end portion and contacts the inner surface of the sheet material. Touched,
The remaining part of the formwork holder is a formwork holder that is detachably or non-detachably connected to the rising formwork. The upper end portion of the sheet material is a plate piece that is hooked to an upright portion provided at a lower outer end of the rising formwork,
The mold holding body according to claim 2, wherein a separation preventing portion that prevents the upper end portion of the sheet material from coming off from the standing portion is provided in the remaining part of the mold holding body. An abandoned formwork made of a bendable sheet material, the upper end of which is connected to a start-up formwork for placing concrete for a start-up part of a building foundation, and a concrete for the footing part of the foundation is placed. An anchor for fixing the formwork to fix the lower end to the ground,
A nail portion that is pierced into the ground from above the lower end of the discarded formwork,
The nail portion is connected to a predetermined position in the length direction of the nail portion so as to be rotatable about a rotation axis whose axis is perpendicular to the length direction of the nail portion, and the lower end portion of the sheet material is viewed from above. A mold fixing anchor having a ground pressing member that presses against the ground.

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