JP3701192B2 - Concrete formwork - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concrete formwork used when concrete is placed in a predetermined shape in a slope reinforcement work in a forest, a ground anchor work, or other civil engineering and building construction sites.
[0002]
[Prior art]
In order to reinforce the ground 21 with the anchor 20 driven into the ground 21 in a slope reinforcement work or the like in a mountain forest, the end of the anchor 20 is attached to the through-hole 29 of the concrete mold 22 and then temporarily tensioned. A method is used in which the concrete 23 is cast and the anchor is tensioned and fixed with a predetermined load after curing the concrete (FIG. 9). FIG. 9 is a schematic cross-sectional view showing a construction example of a concrete formwork.
[0003]
Conventionally, the frame body 24, the substrate 26, and the sheet-like object 25 constituting the concrete mold have been molded integrally by joining a predetermined number of places with screws 28 (FIGS. 10 and 11). In addition, 27 is a reinforcing bar and 29 is a through-hole. FIG. 10 is a perspective view of a conventional concrete formwork, and FIG. 11 is a schematic vertical cross-sectional view taken along the line PQ in FIG.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional concrete formwork, (a) in a portion where the screw 28 is not struck, the concrete placed in the joint portion of the substrate 26, the frame body 24, and the sheet-like object 25. Since a gap is generated by the pressure of 23, the concrete 23 enters the gap, and the concrete leaks to the outside of the concrete mold 22, so that the concrete to be placed is wasted. In addition, the concrete leaked from the concrete form was solidified along the slope, and the beauty of the slope was impaired. (B) Since the sheet-like object and the frame body are not fixed to the substrate in the portion where the screw 28 is not struck, the rigidity of the concrete formwork as a whole is not sufficient. (C) Since there are a plurality of places where the screw 28 is hit, it is necessary to carry out the screwing operation a plurality of times, which is very complicated and inefficient in work efficiency.
[0005]
The present invention has been made in order to solve the above-described conventional problems, and the concrete does not leak out from the joint portion of the substrate, the frame body, and the sheet-like material to the outside of the concrete formwork. It is intended to provide a concrete formwork that has sufficient rigidity to withstand casting and that can be manufactured by joining and integrating substrates, frames, and sheet-like materials efficiently with simple operations. And
[0006]
[Means for Solving the Problems]
The present invention includes (1) a concrete mold in which concrete is placed in a hollow portion formed by covering the top and bottom surfaces of a substrate with a frame and a sheet-like material, respectively, and at least part of the peripheral edge of the substrate is bent. The peripheral portion of the frame body and the sheet-like material is sandwiched between the sandwiching portions having the bent pieces formed in the above-described manner, and at least one tongue piece provided in the sandwiching portion penetrates the frame body and the sheet-like material. A concrete mold characterized by being fitted into at least one or more board fitting holes provided in the clamping part, and (2) by covering the top and bottom surfaces of the board with a frame and a sheet-like material, respectively. In a concrete formwork in which concrete is placed in a hollow portion to be formed, a peripheral member of a substrate, a frame body, and a sheet-like material is sandwiched between sandwiching members each having a bent piece formed by bending, and the sandwiching member is provided. Et A concrete mold characterized in that at least one tongue piece penetrates the substrate, the frame body and the sheet-like material and is fitted into at least one clamping member fitting hole provided in the clamping member. It is a frame.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
First, the structure of the concrete formwork of the present invention will be described. The concrete formwork of the present invention is a peripheral part of a frame and a sheet-like material in a sandwiching part having a bent piece formed by bending at least a part of the peripheral part of the substrate at a joint part of the substrate, the frame and the sheet-like material. And at least one or more tongue pieces provided in the holding portion are inserted into the at least one board fitting hole provided in the holding portion through the frame body and the sheet-like object. have. Hereinafter, it demonstrates in detail based on drawing. FIG. 1 is a schematic cross-sectional view showing an embodiment of the concrete form of the present invention.
[0008]
The concrete formwork 1 of the present embodiment is formed in a cross shape as shown in FIG. After the reinforcing bar 3 is disposed above the cross-shaped substrate 2, the upper surface thereof is covered with the frame body 4. On the other hand, the bottom surface of the substrate 2 is covered with a loose sheet-like material 5. In addition, a through hole 6 is provided in the center of the cross shape of the concrete mold 1 for allowing the anchor to pass therethrough. In this embodiment, the concrete formwork 1 is a cross shape, but it is possible to use a shape that is appropriately modified in accordance with the shape of a slope or the like. For example, a shape in which a plurality of legs such as three, five, and six are radially projected, a rectangular shape, and the like can be given.
[0009]
The frame 4 has a mesh in whole or in part, and is provided with an opening 7 for pouring concrete, and wire mesh expanded metal, punch metal, or the like is used. Examples of the material include steel, synthetic resin, wood, and hard paper. Further, a plurality of frame body fitting holes 15 for fitting a tongue piece 9 to be described later are formed at predetermined positions near the peripheral edge of the frame body 4.
[0010]
Since the frame body 4 has a mesh structure, when concrete is placed, the air contained in the concrete can be released to the outside of the concrete formwork, and the concrete is firmly solidified. Can be constructed. Moreover, since the concrete filling condition in the concrete formwork can be confirmed, efficient work is possible.
[0011]
When concrete is poured into the concrete mold 1 from the opening 7, the concrete cast on the outer surface of the frame 4 oozes out somewhat. Then, the surface of the exuded concrete is uniformly finished with a brush or the like. As a result, the concrete formwork is in a state where all surfaces other than the sheet-like material are covered with concrete and are excellent in aesthetic appearance.
[0012]
The reinforcing bar 3 is joined to the substrate 2 by welding, binding wire or the like, and is disposed in the concrete formwork.
[0013]
The substrate 2 is a cross-shaped plate, but the rectangular substrate member 8 shown in FIG. 2 is crossed into two crosses, and the overlapping portions are welded (spot welding, electric spot welding, etc.) or a connecting material. It can form by connecting with. Alternatively, a plate-like body formed in a cross shape can be used. Examples of the material for the plate-like body include steel, synthetic resin, wood, and hard paper.
[0014]
The substrate member 8 is a rectangular plate-like body as shown in FIG. A tongue piece 9 is provided at a predetermined position on the peripheral edge of the substrate member 8. Further, on the board member 8, board fitting holes 10 and holes 11a to 11d are formed at predetermined positions. The tongue piece 9 is vertically raised on the upper surface of the substrate member 8 as shown in FIG. The diameter of the board fitting hole 10 is larger than the diameter of the tongue piece 9 (for example, about 2 to 3 millimeters) because the tongue piece 9 is fitted into the board fitting hole 10. The holes 11a to 11d are provided so that the placed concrete is evenly distributed throughout the concrete formwork.
[0015]
The board member 8 is bent vertically downward at the dotted line part b to form a bent part B. A bending member 14 is formed between the bent portion B and a bent portion A described later. Next, a bent portion A is formed by bending outward at a dotted line portion a. A bent piece 13 is formed between the bent portion A and the peripheral edge portion of the substrate member 8 (FIG. 3B). The bending piece 13 and the bending member 14 constitute a clamping portion. Moreover, although not shown in figure, a clamping part can also be comprised without forming the bending part B. FIG. In the present embodiment, the tongue piece 9 of the holding portion is provided on the bent piece 13, but the holding portion may be configured such that the bent member 14 has the tongue piece 9. The joint 12 is formed by bending vertically upward at the dotted line portion c. In addition, the junction part 12 is a location joined to the reinforcing bar 3.
[0016]
The sheet-like object 5 is a flexible sheet that covers the entire bottom surface of the concrete formwork and is attached with a margin. Examples of the material include woven fabric and non-woven fabric that do not allow concrete to flow out and discharge water. Therefore, when concrete is placed on the concrete formwork 1, the concrete can follow the uneven shape such as the slope by the sheet-like material 5, and a concrete formwork suitable for the slope or the like can be formed.
[0017]
The through-hole 6 is a through-hole provided in a vertical direction through the center of the concrete mold in order to allow the anchor to penetrate the concrete mold. Accordingly, the substrate 2, the frame body 4, and the sheet-like object 5 are each provided with a through hole larger than the diameter of the anchor.
[0018]
Next, the manufacturing method of this invention concrete formwork is demonstrated.
(1) The upper surface of the substrate 2 to which the reinforcing bars 3 are bonded is covered with a frame body 4 and the bottom surface is covered with a sheet-like object 5 having a margin.
[0019]
(2) The peripheral portion of the frame body 4 and the peripheral portion of the sheet-like object 5 are superposed on the bent member 14 (FIG. 3B) that is bent vertically downward of the peripheral portion of the substrate 2. At this time, the positions are aligned so that the frame fitting holes 15 of the frame 4 are aligned with the board fitting holes 10.
[0020]
(3) The bent piece 13 is bent upward (in the direction of arrow G in FIG. 4A) using the bent portion A as a fulcrum (FIG. 4A). FIG. 4 is an enlarged sectional view of a main part for explaining the method for producing the concrete formwork of the present invention.
[0021]
(4) The bent piece 13 is bent to the state shown in FIG. 4 (b), and the holding portion composed of the bent piece 13 and the bent member 14 is pressed between the frame body 4 and the sheet-like object 5. Plastically deformed. At this time, the tongue piece 9 is formed by breaking through the sheet-like material 5 and fitting into the frame body fitting hole 15 of the frame body 4 and the board fitting hole 10 of the board 2 (FIG. 4B).
[0022]
Thereby, the junction part of the board | substrate 2, the frame 4, and the sheet-like object 5 is formed without the gap over the whole peripheral part of the board | substrate 2. FIG. When the concrete is placed, the joint portion is plastically deformed by pressing the holding portion composed of the bent piece 13 and the bent member 14, so that no gap is generated due to the placing pressure of the concrete 16. The concrete 16 does not leak from the joint. Further, since the tongue piece 9 is fitted in the frame fitting hole 15 and the board fitting hole 10, the frame 4 is lifted from the concrete mold 1 by the pressure of the placed concrete 16, and the concrete mold is loose. No loosening occurs (Fig. 5). In addition, FIG. 5 is a schematic longitudinal cross-sectional view at the time of constructing the concrete formwork of the present invention on a slope or the like.
[0023]
Next, another embodiment of the concrete mold of the present invention will be described. The concrete mold of the present invention sandwiches the peripheral portion of the substrate, the frame body, and the sheet-like material between the substrate, the frame body, and the sheet-like material, and the sandwiched member having a bent piece. At least one tongue piece provided in the holding member has a configuration that penetrates the substrate, the frame body, and the sheet-like material and is fitted into at least one holding member fitting hole provided in the holding member. ing. Hereinafter, it demonstrates in detail based on drawing.
[0024]
The shape of the concrete form is not limited to the cross shape (FIG. 1), as in the above-described embodiment, but may be a shape in which a plurality of legs such as three, five, six, etc. are radially projected, or a rectangular shape. Can be mentioned.
[0025]
The frame body 4, the reinforcing bar 3, and the sheet-like object 5 are the same as in the above-described embodiment.
[0026]
The substrate 31 is a cross-shaped plate, but the rectangular substrate member 30 shown in FIG. 6 is crossed into two crosses, and overlapping portions are welded (spot welding, electric spot welding, etc.) or a connecting material. It is formed by connecting with. Alternatively, a plate-like body formed in a cross shape can be used. About the material of a plate-shaped object, it is the same as that of the above-mentioned Example.
[0027]
The substrate member 30 is a rectangular plate-shaped body as shown in FIG. Similar to the above-described embodiment, the board fitting hole 32 and the holes 33a to 33d are formed at predetermined positions of the board member 30.
[0028]
The board member 30 is bent vertically downward at the dotted line part d to form a bent part D (FIGS. 8A and 8B). Further, the joint 34 is formed in the same manner as in the above-described embodiment by bending upward at the dotted line portion e.
[0029]
The sandwiching member 35 is a rod-shaped member having a groove portion 36 and a substantially V-shaped cross section. Examples of the material of the holding member include steel, synthetic resin, wood, and hard paper. The pinching member 35 is provided at a predetermined position so that the tongue piece 38 is fitted in the pinching member fitting hole 39 when the bending portion 37 is bent. FIG. 7A is an abbreviated perspective view of the holding member 35, and FIG. 7B is a schematic vertical cross-sectional view taken along the line Z-W of FIG. Further, since the tongue piece 38 is fitted into the holding member fitting hole 39, the diameter of the holding member fitting hole 39 is larger than the diameter of the tongue piece 38 (for example, the diameter is 2 to 3). Mm is larger.) Is formed.
[0030]
Next, the manufacturing method of the other Example of a concrete formwork is demonstrated.
(1) The upper surface of the substrate 31 to which the reinforcing bars 3 are bonded is covered with the frame body 4, and the bottom surface is covered with the sheet-like object 5 in a state having a margin.
[0031]
(2) The peripheral edge portion of the frame body 4 and the peripheral edge portion of the sheet-like object 5 are overlapped in this order on the portion of the substrate 31 that is bent vertically downward. At this time, the positions are aligned so that the frame fitting holes 15 of the frame 4 are aligned with the board fitting holes 32 of the substrate 31.
[0032]
(3) The peripheral portions of the substrate 31, the frame body 4, and the sheet-like object 5 are applied to the groove portion 36 of the holding member 35, and the holding member fitting hole 39, the board fitting hole 32, and the frame body fitting hole 15 are formed. Align the positions to fit. In FIG. 8, the portion having a holding member fitting hole 39 in the holding member 35, the case in contact with the substrate 31, the portion having a holding member fitting hole 39 in the holding member 35 The structure which touches the sheet | seat 5 may be sufficient.
[0033]
(4) in the fulcrum bent portion 37 of the holding member 35, holding member 35 is a substrate 31, the frame 4 and so as to sandwich the sheet 5 will bend (see FIG. 8 (a) the direction of the arrow H) (FIG. 8 (a)).
[0034]
(5) the substrate 31 is bent to the state of the holding member 35 FIG. 8 (b), the plastically deformed to be pressed by clamping the frame 4 and sheet 5. At this time, the tongue piece 38 is formed by breaking through the sheet-like material and fitting into the frame fitting hole 15, the board fitting hole 38 and the holding member fitting hole 39 (FIG. 8B).
[0035]
Thereby, the junction part of the board | substrate 31, the frame 4, and the sheet-like object 5 is formed without the gap over the whole peripheral part. Concrete upon Da設, the bonding portion, since the plastic deformation pressed by a holding member 35, no gap is caused by striking設圧force of the concrete, that the leaking concrete from junction Absent. Further, since the tongue piece 38 is fitted into the frame body fitting hole 15, the board fitting hole 32, and the holding member fitting hole 39, the frame body 4 is lifted from the concrete mold by the pressure of the placed concrete. There is no play or looseness in the concrete formwork.
[0036]
【The invention's effect】
In a concrete mold in which concrete is placed in a hollow portion formed by covering the top and bottom surfaces of a substrate with a frame and a sheet, respectively, a bent piece formed by bending at least a part of the peripheral edge of the substrate A configuration in which the peripheral portion of the frame body and the sheet-like material is sandwiched between the sandwiching portions having a structure, or a configuration in which the peripheral portion of the substrate, the frame body, and the sheet-like material is sandwiched by a clamping member formed by bending. Since the joint portion of the substrate, the frame body, and the sheet-like material is in close contact with each other, there is no possibility that a gap will be generated by the concrete placement pressure when the concrete is placed. The concrete does not leak from the joint.
[0037]
A configuration in which at least one or more tongue pieces provided in the sandwiching portion pass through the frame body and the sheet-like material and fit into at least one or more board fitting holes provided in the sandwiching portion, or a sandwiching member The at least one or more tongue pieces provided pass through the substrate, the frame body, and the sheet-like material and are fitted into at least one or more holding member fitting holes provided in the holding member. Since the piece is fitted in the board fitting hole or the pinching member fitting hole, the frame will not be lifted from the concrete formwork due to the pressure of the placed concrete, and there will be no play or looseness in the concrete formwork. It has sufficient rigidity to withstand concrete placement.
[0038]
The operation of sandwiching the peripheral portion of the frame body and the sheet-like material in the sandwiching portion and the operation of the tongue piece penetrating the frame body and the sheet-like material and fitting into the board fitting hole provided in the sandwiching portion, or The operation of clamping the peripheral portion of the substrate, the frame and the sheet-like object with the clamping member and the operation of fitting the tongue piece into the clamping member fitting hole through the substrate, the frame and the sheet-like object, respectively It can be performed in one operation, and the substrate, the frame and the sheet can be joined and integrated efficiently with a simple operation.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an embodiment of a concrete form of the present invention.
FIG. 2 is a plan view of a substrate member used in the concrete formwork of the present invention.
3 is a longitudinal sectional view taken along line XY in FIG. 2;
FIG. 4 is an enlarged sectional view of an essential part for explaining a method for producing a concrete form of the present invention.
FIG. 5 is a schematic longitudinal sectional view when the concrete formwork of the present invention is constructed on a slope or the like.
FIG. 6 is a plan view of a substrate member used in another embodiment of the concrete formwork of the present invention.
7A is an abbreviated perspective view of the pinching member 35, and FIG. 7B is a schematic vertical sectional view taken along the line Z-W of FIG. 7A.
FIG. 8 is an enlarged sectional view of an essential part for explaining a manufacturing method in another embodiment of the concrete form of the present invention.
FIG. 9 is a schematic cross-sectional view showing a construction example of a concrete formwork.
FIG. 10 is a perspective view of a conventional concrete formwork.
11 is a schematic vertical cross-sectional view taken along the line PQ in FIG. 10 after the concrete has been placed and constructed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concrete formwork 2 Board | substrate 3 Reinforcement 4 Frame 5 Sheet-like object 9 Tongue piece 10 Board | substrate fitting hole 13 Bending piece

Claims (2)

In a concrete formwork in which concrete is placed in a hollow portion formed by covering an upper surface and a bottom surface of a substrate with a frame and a sheet, respectively, a bent piece formed by bending at least a part of a peripheral portion of the substrate The peripheral portion of the frame body and the sheet-like material is sandwiched between the sandwiching portions, and at least one tongue piece provided in the sandwiching portion is provided in the sandwiching portion through the frame body and the sheet-like material. A concrete formwork that is fitted into at least one board fitting hole. A concrete mold in which concrete is placed in a hollow portion formed by covering the upper surface and the bottom surface of a substrate with a frame and a sheet-like material, respectively. And at least one or more tongue pieces that sandwich the peripheral portion of the sheet-like material and that are provided on the clamping member through the substrate, the frame body, and the sheet-like material. A concrete formwork that is fitted in a holding member fitting hole.

Images