JP4667617B2 - Concrete formwork support - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support for a panel-shaped concrete form that is arranged in parallel with an interval corresponding to the thickness of a concrete wall and supports concrete pouring pressure during concrete pouring.
[0002]
[Prior art]
When forming a concrete wall, place the panel formwork in parallel with each other at intervals according to the thickness of the concrete wall to be formed, and place the concrete between the panel formwork until it hardens. However, when concrete is placed, a large lateral pressure acts on the formwork due to the pressure of the concrete. A flat concrete wall cannot be formed if the panel formwork is bent by receiving the side pressure of the concrete.
[0003]
Therefore, a foam tie (registered trademark; the same shall apply hereinafter) is usually formed by assembling a vertical butterfly pipe and a horizontal butterfly pipe vertically and horizontally on the outer surface of the formwork to form a pipe frame body, and extending from a separator that keeps the space between the formwork. Such a member is projected from the formwork, and a washer and nut are screwed into the projecting portion to fasten and fix the pipe frame.
[0004]
Steel pipes, etc. are used as butter pipes. However, since butter pipes are used in large quantities, this method is expensive in terms of material and transportation costs, and requires a lot of time and labor for transportation, installation, and dismantling. However, there are also disadvantages such as requiring large space and labor.
[0005]
In order to solve this problem, as shown in FIG. 7, the panel-shaped molds A and B are arranged in parallel at predetermined intervals according to the thickness of the concrete wall C, and as shown in FIGS. Forming a side peripheral surface 12b having a square flat top surface 12a and projecting at right angles from the periphery thereof, a casing 13 having a U-shaped vertical cross section is formed, and a square shape is formed on the open end surface of the side peripheral surface 12b. The seat plate 14 is fixed so that the center of the top surface 12a of the housing 13 and the center of the seat plate 14 coincide with each other to form the flange portion 15 and reinforced by the ribs 16, and the center of the top surface 12a and the seat plate 13 is secured. The support 11 having the insertion holes 17 and 18 of the foam tie (separator) 20 is disposed in the through hole 17 and 18 and the molds A and B are inserted through the form tie 20. At the back side, attach a P-con 21 to the other end of the foam tie (separator) 20 and protrude A nut N is screwed into one end portion of the foam tie (separator) 20 via a washer W, an adjustment tool is inserted from the foam tie adjustment hole 19, and the foam tie (separator) 20 is rotated to rotate the washer W and the housing. There has been proposed a concrete mold support system in which the butter pipes P1 and P1 are sandwiched between the top surface 12a of the body 13 (Japanese Utility Model Publication No. 3-29471).
[0006]
Further, as shown in FIG. 9, the distance between the concrete molds A and B is brought into contact with the inner wall surface of the concrete mold A and (B) at both ends of the separator 20 installed between the concrete molds A and (B). Is attached to the other end of the locking tool 30, the shaft foot 40 is protruded from the outer wall surface of the mold A, and the shaft foot 40 is connected. Further, a cup-shaped portion 52 having a substantially conical or substantially cylindrical shape with an opening 57 through which the shaft foot 40 is inserted, and a flange portion 54 protruding in the circumferential direction from the opening peripheral edge of the cup-shaped portion 52 are provided. After mounting the support tool 50, a foam tie 62 is connected to the other end of the shaft foot 40 so that the vertical butter pipe 92 and the horizontal butter pipe 94 are clamped between the washer 64, the nut 66 and the upper surface of the support tool 50. A method for supporting a concrete formwork that has been proposed has also been proposed (Japanese Patent Laid-Open No. Hei 11). 190,127 JP).
[0007]
When these support tools are used, the outer surface of the concrete formwork is supported by the wide bottom surface of the support tool, so the support area of the concrete formwork can be expanded and the number of butterpipes used is reduced. Even in this case, it is possible to reduce deformation, displacement and breakage of the formwork due to the pressure of the concrete placed between the formwork compared to the conventional butterpipe method. In the latter case, this point is improved, but it is difficult to hold, so it is difficult to mount and dismantle, especially when it is disassembled. In that case, there are not many cases, and in that case, the support tool is deformed or broken because it is removed by hitting it with a hammer or the like in the field. In addition, since the lower surface of the support is circular, when the support is allocated within the limited dimensions of the panel formwork, the support does not fit well. However, there is a drawback that it does not necessarily have sufficient strength.
[0008]
[Problems to be solved by the invention]
The present invention has been made as a result of extensive tests and examinations on the relationship between the structure of the support and the above improvements in order to eliminate the above-mentioned conventional problems in the support for concrete formwork. Yes, its purpose is easy to hold, easy to install and dismantle, and it can be stacked, so it is convenient for storage and transportation, and when it is assigned to the panel formwork, it reduces the distance between supports A concrete formwork support that can give sufficient strength to the formwork against the pressure of the concrete and that can be allocated according to the straight line at the end of the panel formwork There is to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a concrete formwork support according to claim 1 is provided for holding a panel formwork at regular intervals via a separator when placing concrete between panel formwork. A supporting tool comprising a cup-shaped main body having a substantially truncated pyramid shape with a depressed portion in the center, provided with an opening on each side of the main body, and extending laterally to a lower peripheral edge continuous with each side of the main body. The bottom surface of the depressed portion in the center of the main body is located on the same surface as the lower end surface of the main body, and an insertion hole of a member provided to be connected to the separator or the separator is provided on the bottom surface of the depressed portion. The support is formed in accordance with the straight line portion at the end in the width direction of the panel-shaped mold, and is arranged in parallel in the width direction of the panel-shaped mold by bringing the flanges into contact with each other. It is characterized in that it is arranged in a panel-like mold and .
[0010]
A concrete formwork support according to claim 2 is characterized in that, in claim 1, the substantially truncated pyramid-shaped cup-shaped body has a substantially truncated hexagonal pyramid shape or a substantially truncated quadrangular pyramid shape.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the structure and usage of the concrete formwork support of the present invention will be described with reference to the drawings. In addition, these aspects are for demonstrating one preferable embodiment of this invention, and this invention is not restrict | limited by this. In addition, the same code | symbol was attached | subjected to the same member as the conventional one.
[0014]
The support for concrete formwork of the present invention is used in the same form as the conventional support shown in FIGS. 7 to 8 and FIG. 9, and when placing concrete between panel formwork, It is a support for holding the frame at regular intervals via a separator (form tie 20 in FIG. 7, separator 20 in FIG. 9), and as shown in FIGS. The cup-shaped main body 2 has a substantially truncated pyramid shape, and a depressed portion 3 is formed in the center of the upper surface 10 of the main body 2 in the opening direction of the cup-shaped main body 2, and the opening 5 is provided on the side surface 4 of the main body 2. A flange 6 extending in the lateral direction is provided at the lower peripheral edge of the main body 2, and a separator (form tie 20 in FIG. 7) or a separator is connected to the bottom surface 7 of the depression 3. Members (shaft foot 40 in FIG. 9), etc. Member extending continuously connected to the regulator is formed an insertion hole 8 for inserting.
[0015]
Various polygonal shapes can be applied as the bottom surface shape of the substantially truncated pyramid-shaped main body 2, but practically the substantially truncated pyramid-shaped main body 2 is substantially the same as shown in FIGS. A truncated hexagonal pyramid shape or a substantially truncated quadrangular pyramid shape is preferable.
[0016]
In the concrete formwork support 1 according to the present invention, the opening 5 of the side surface 4 of the main body 2 is formed on each side surface 4A, 4B, 4C, 4D, 4E, 4F of the truncated pyramid of the main body 2 having a substantially truncated pyramid shape. It is preferable in terms of handling.
[0017]
Moreover, it is preferable that the bottom surface 7 of the depressed portion 3 formed at the center of the upper surface of the main body 2 is located on the same surface as the lower end surface 9 of the main body. With this configuration, the outer wall surface of the mold is more stable. Can be supported.
[0018]
Referring to FIG. 4, a form in which the panel-shaped formwork is attached using the concrete formwork support tool 1 of the present invention will be described. Temporarily fix the reinforcing bars embedded in the interior, arrange them at predetermined intervals, insert the protruding end of the separator 20 into the opening of the panel-shaped mold A, and raise the mold A.
[0019]
Next, the support 1 is mounted on the separator 20 protruding from the outer wall surface of the mold A through the insertion hole 8 provided in the bottom surface 7 of the depressed portion 3, and the foam tie 60 is attached to the protruding end of the separator 20. Install.
[0020]
In this state, the butter pipes P1 and P1 are placed so as to be placed on the upper surface 10 of the support 1, and a washer W and a nut N are screwed into the foam tie 60, and the butter pipes P1 and P1 are pressed between the washer W and the support 1. And fix.
[0021]
When the butter pipes P1, P1 are pressed by the washer W, the butter pipes P1, P1 press the upper surface 10 of the support tool 1, and the flange portion 6 of the support tool 1 presses the outer wall surface of the concrete formwork A. The concrete formwork A is firmly supported between the locking tool 30.
[0022]
The other end of the separator 20 is inserted into the opening of the panel-shaped mold B, and the mold B is raised. Similarly, the support 1 and the foam tie 60 are attached, the butter pipe is disposed, and the concrete mold is formed by a washer and a nut. Support the frame B. In addition, attachment of the support tool 1 and the foam tie 60 can also be applied only to one concrete formwork A or B instead of both the concrete formwork A and B according to the use condition of the concrete formwork.
[0023]
Further, in the above embodiment using the support 1 of the present invention, an example in which only one direction (vertical or horizontal) butter pipe is provided is shown. However, as shown in FIG. In addition, when the present invention is applied to a concrete formwork in a relatively narrow place, the concrete formwork is supported by using only the support 1 without arranging a butter pipe. It is also possible.
[0024]
【Example】
2, a = 275 mm, b≈318 mm, and in FIG. 3, a substantially truncated hexagonal pyramid-shaped support device (aluminum) according to the present invention having a height c = 49.5 mm from the upper surface 10 to the lower end surface 9. Made of an alloy) and these supports were placed in a panel-like concrete form having a width of 600 mm and an end width of 25 mm, for example.
[0025]
As shown in FIG. 5, a conventional substantially frustoconical support (diameter of the bottom surface: 275 mm) formed by arranging the support according to the present invention at an interval of 89 mm and matching the dimensions of the above concrete formwork, When arranged so as to be centered with the support of the present invention, the distance between the supports was 125 mm, as shown in FIG.
[0026]
That is, when the support tool of the present invention is compared with the conventional support tool, the support tool of the present invention can cover a large area by reducing the interval when the same number of support tools are used. As shown in the following formula, the bending amount generated in the concrete form due to the pressure of the concrete is proportional to the fourth power of the support interval, so a slight difference in the support interval is a large difference in the bending amount.
δ = (5ωL ⁴ ) / (384EI)
δ: Bending amount generated in the formwork, ω: Concrete pressure (side pressure), L: Space between the supports, E: Young's modulus of the formwork, I: Secondary moment of section of the formwork
Therefore, when the support tool of the present invention is used, the amount of bending of the panel formwork due to the pressure of the concrete becomes smaller, and the flatness of the concrete wall to be formed is improved. Moreover, as shown in FIG. 5, since the support of this invention can be allocated according to the linear part of the edge part of a formwork, a more stable support structure is obtained.
[0028]
【The invention's effect】
According to the present invention, the following effects can be obtained.
(1) Since the opening 5 serves as a handle, it is easy to hold and can be easily transported, installed in the field, and disassembled. There is no deformation or damage. It is convenient for storage because it can be stacked.
(2) When using the same number of support tools as compared to the conventional support tools, it is possible to cover a large area by reducing the interval, so the bending amount of the panel formwork due to the pressure of concrete is smaller Thus, the flatness of the concrete wall to be formed is improved.
(3) Since it can be allocated according to the straight line portion at the end of the mold, a more stable support structure can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a concrete formwork support according to the present invention.
FIG. 2 is a plan view of the support of FIG.
3 is a cross-sectional view taken along the line XX in FIG.
4 is a partial cross-sectional view showing a usage pattern of the support of FIGS.
FIG. 5 is a view in which the support of the present invention is arranged in a panel-shaped concrete formwork.
FIG. 6 is a view in which a conventional support is arranged in a panel-shaped concrete formwork.
FIG. 7 is a partial cross-sectional view showing a usage pattern of a conventional support.
8 is a plan view of the support of FIG.
FIG. 9 is a partial cross-sectional view showing a usage pattern of a conventional support.
[Explanation of symbols]
1 Supporting tool (present invention)
2 Body 3 Depressed part 4 Side surface 5 Opening 6 Gutter part 7 Depressed part bottom surface 8 Insertion hole 9 Lower end surface 10 Upper surface 20 Separator 30 Locking tool 60 Form tie P1 Butter pipe P2 Batter pipe A Panel-shaped form B Panel-shaped form C Concrete W Washer N Nut 11 Support (Conventional)
12a Top surface 12b Side peripheral surface 13 Housing 14 Seat plate 15 Flange portion 16 Rib 17 Foam tie insertion hole 18 Foam tie insertion hole 19 Foam tie adjuster insertion hole 21 P-con 40 Shaft foot 50 Support (conventional)
52 cup-shaped part 54 collar part 57 opening

Claims (2)

When placing concrete between panel-shaped molds, it is a support for holding the panel-shaped molds at regular intervals via a separator, and is a cup-shaped main body having a substantially truncated pyramid shape having a depression in the center. Each of the side surfaces of the main body is provided with an opening, a lower peripheral edge continuous with each side surface of the main body is provided with a flange extending laterally, and the bottom surface of the depressed portion in the center of the main body is the lower end surface of the main body located in the same plane as, it forms a through hole of the member provided by concatenating the separator or separator to the bottom of the recess, wherein the support device, the width direction of the panel-shaped formwork end A support for concrete formwork, which is arranged in accordance with the straight line part, and is arranged in the panel-like formwork so as to be arranged in parallel in the width direction of the panel-like formwork with the flange parts in contact with each other. . 2. The concrete formwork support according to claim 1, wherein the cup-shaped main body having a substantially truncated pyramid shape has a substantially truncated hexagonal pyramid shape or a substantially truncated quadrangular pyramid shape.

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