Dam plate support structure for concrete form and installation method for concrete form

Abstract

To suppress an accuracy deterioration of a concrete structure even when using a dam plate made of corrugated cardboard.SOLUTION: A dam plate support structure for concrete form comprises: a post that holds the dam plate made of corrugated cardboard horizontally so as to cover a side end of the dam plate; and a cross member that connects the dam plates vertically so as to cover an upper and lower ends of adjacent dam plates.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a weir plate support structure for a concrete formwork and a method for installing a concrete formwork.

Background Art

[0002] Conventionally, when forming the foundation of a building, a concrete formwork is used to place concrete. As such a concrete formwork, for example, as shown in Patent Document 1, a configuration is disclosed in which fitting members are fitted between the concave portions at the upper ends and the concave portions at the lower ends of the weir plates in the vertical direction, so that the weir plates can be connected in the vertical direction.

[0003] As such a concrete formwork, it is common to use a weir plate made of plywood, but from the perspective of weight reduction, using a weir plate made of cardboard has been considered.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in such a method for installing a concrete formwork, there is a risk that the moisture contained in the fresh concrete may enter the weir plate from the end of the weir plate made of cardboard. Thus, when moisture enters the weir plate made of cardboard, the weir plate may be deformed. Therefore, even when using a weir plate made of cardboard, it is desired to suppress a decrease in the accuracy of the concrete structure.

Means for Solving the Problems

[0006] The concrete formwork support structure for solving the above problems includes a support column that holds the weir plate horizontally from the side to cover the side end of the weir plate made of cardboard, and a cross member that vertically connects the weir plates to cover the upper and lower ends of the weir plates with each other.

[0007] The installation method of the concrete formwork support structure for solving the above problems includes holding the weir plate horizontally from the side to the support column so as to cover the side end of the weir plate made of cardboard, installing a cross member above the weir plate so as to cover the upper end of the weir plate, and connecting the other weir plate above the cross member so as to cover the lower end of the other weir plate.

Effect of the Invention

[0008] According to the present invention, even when using a weir plate made of cardboard, it is possible to suppress a decrease in the accuracy of the concrete structure.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiment for Carrying out the Invention

[0010] [First Embodiment] An embodiment of a weir plate support structure for a concrete formwork and a method for installing a concrete formwork will be described. Hereinafter, the concrete formwork will be simply referred to as a formwork. In the following description, the direction intersecting the vertical direction Z is shown as the width direction X, and the direction intersecting the vertical direction Z and the width direction X is shown as the thickness direction Y. The width direction X is the direction along the width of the formwork. The thickness direction Y is the direction along the thickness of the formwork. The thickness direction Y also becomes the direction of the thickness of the concrete to be placed. Among the thickness direction Y, the direction in which the concrete placement surface is formed is shown as the inner side Y1, and the direction in which the concrete placement surface is not formed among the thickness direction Y is shown as the outer side Y2.

[0011] [Configuration of Formwork 10] As shown in FIG. 1, the formwork 10 is a member for forming concrete when placing concrete. Although it will be described in detail later, the formwork 10 is configured by the weir plate support structure 11 supporting the weir plate 90. The formwork 10 is installed on the installation surface 97. The installation surface 97 may be composed of an installation member that covers the formwork 10 from the bottom side, or may be a concrete surface placed in a planar shape.

[0012] [Configuration of Weir Plate 90] The formwork 10 includes a weir plate 90. The formwork 10 includes a plurality of weir plates 90. The formwork 10 includes a plurality of weir plates 90 in the width direction X. The formwork 10 includes a plurality of stages of weir plates 90 in the vertical direction Z. The plurality of weir plates 90 are installed so as to be two stages in the vertical direction Z, but may be installed so as to be three or more stages in the vertical direction Z, or may be installed so as to be one stage in the vertical direction Z.

[0013] The weir plate 90 is a member for forming a concrete placement surface when placing concrete. The weir plate 90 has a plate shape perpendicular to the thickness direction Y. The weir plate 90 is composed of cardboard. In particular, the weir plate 90 is composed of cardboard having water resistance on its surface.

[0014] The weir plate 90 may have, for example, a square plate shape with a side length of 600 mm, or may have, for example, a square plate shape with a side length of 150 mm, or may have, for example, a square plate shape with a side length of 900 mm. The weir plate 90 has a square plate shape, but may also have a rectangular plate shape.

[0015] As shown in FIG. 2, the weir plate 90 includes an inner wall surface 91 and an outer wall surface 92. The inner wall surface 91 is a plane perpendicular to the thickness direction Y. The inner wall surface 91 is a surface facing inward Y1. The inner wall surface 91 is a surface for forming the concrete placement surface. The outer wall surface 92 is a surface on the opposite side of the inner wall surface 91. The outer wall surface 92 is a plane perpendicular to the thickness direction Y. The outer wall surface 92 is a surface facing outward Y2.

[0016] The weir plate 90 includes side end portions 93. The side end portions 93 are end portions on the width direction X side of the weir plate 90. The weir plate 90 includes an upper end portion 94 and a lower end portion 95. The upper end portion 94 is an end portion on the upper Z1 side of the weir plate 90. The lower end portion 95 is an end portion on the lower Z2 side of the weir plate 90.

[0017] As shown in FIG. 1, a plurality of weir plates 90 can be connected along the width direction X. Thereby, the plurality of weir plates 90 are installed in a row along the width direction X. The plurality of weir plates 90 can also be connected in the thickness direction Y. Thereby, the plurality of weir plates 90 are installed so as to form the corner portions of the formwork 10. The plurality of weir plates 90 can be connected along the vertical direction Z. Thereby, the plurality of weir plates 90 are installed in a plurality of stages in the vertical direction Z.

[0018] The plurality of weir plates 90 may be installed in two rows such that the inner wall surfaces 91 face each other. In this way, when placing concrete, fresh concrete is poured into the space surrounded by the two inner wall surfaces 91.

[0019] <Configuration of the weir plate support structure 11> The formwork 10 includes a weir plate support structure 11. The weir plate support structure 11 is configured to support the weir plate 90. The weir plate support structure 11 is configured to support a plurality of weir plates 90. The weir plate support structure 11 may be made of resin, such as reinforced plastic for example. The weir plate support structure 11 may be made of metal, such as stainless steel, aluminum, or iron for example. The weir plate support structure 11 is preferably lightweight. The weir plate support structure 11 is preferably made of a material that is difficult to rust.

[0020] The weir plate support structure 11 includes a support column 12 and a cross member 13. The weir plate support structure 11 may include a plurality of support columns 12 and a plurality of cross members 13. The weir plate support structure 11 may include a support portion 14. The weir plate support structure 11 may include a plurality of support portions 14.

[0021] <Configuration of the support column 12> The support column 12 extends in the vertical direction Z. The support column 12 is configured to hold the weir plate 90 from the width direction X. That is, the support column 12 is configured to hold the weir plate 90 from the horizontal direction. The support column 12 is configured to hold the weir plate 90 from the horizontal direction so as to cover the side end portion 93 of the weir plate 90. The plurality of support columns 12 may include a support column disposed at the lower stage in the vertical direction Z and a support column disposed at the upper stage in the vertical direction Z.

[0022] As shown in FIGS. 1 and 3, the support column 12 includes a lower stage support column 20. The lower stage support column 20 is disposed at the lower stage of the formwork 10. The lower stage support column 20 is a support column for disposing the weir plate 90 on both sides in the width direction X.

[0023] As shown in FIG. 3, the lower stage support column 20 includes a base portion 21 and a column portion 22. The base portion 21 is placed on the installation surface 97. The base portion 21 may have a flat plate shape. The base portion 21 is provided at the lower end portion 22A of the column portion 22. The base portion 21 supports the column portion 22.

[0024] The base portion 21 extends outward in the Y2 direction from the lower end portion 22A of the column portion 22. The base portion 21 may be provided with a connecting hole 21A. The connecting hole 21A may be a hole for connecting to a joist member (not shown) located below the formwork 10 in the Z2 direction.

[0025] The column portion 22 extends in the vertical direction Z. The column portion 22 may be at the same height as the weir plate 90 in the vertical direction Z. The column portion 22 extends upward in the Z1 direction from the upper surface 21B of the base portion 21. The column portion 22 has an H shape in plan view from above in the Z1 direction.

[0026] The column portion 22 includes a column main body 23. The column main body 23 extends along the vertical direction Z. The column main body 23 includes an inner wall surface 23A, an outer wall surface 23B, a first side wall surface 23C, and a second side wall surface 23D. The inner wall surface 23A is a surface facing inward in the Y1 direction. The outer wall surface 23B is a surface facing outward in the Y2 direction. The first side wall surface 23C is a surface facing in the first width direction X1. The second side wall surface 23D is a surface facing in the second width direction X2.

[0027] The column main body 23 may be provided with an insertion hole 23E. That is, the support column 12 may be provided with an insertion hole 23E. The insertion hole 23E is a hole that penetrates the column main body 23 along the thickness direction Y. The insertion hole 23E is a hole through which one end portion 98A of the separator 98 can be inserted.

[0028] For the installation of the formwork 10, a separator 98 and a fastening member 99 may be used. The separator 98 is attached to the inner side Y1 of the formwork 10. The separator 98 is a member for maintaining the interval between two rows of formwork 10. The separator 98 may have a round bar shape. One end portion 98A of the separator 98 is configured in the same manner as the other end portion (not shown). Therefore, the one end portion 98A of the separator 98 will be described by way of representative.

[0029] One end 98A of the separator 98 is attached with a P - connector 98B. The P - connector 98B can be adjusted in the thickness direction Y by screwing with the separator 98. When the P - connector 98B is screwed to the tightening member 99 with one end 98A of the separator 98 inserted into the insertion hole 23E, it presses the formwork 10 from the inner Y1 side.

[0030] The tightening member 99 is a member for tightening the separator 98. The tightening member 99 may be a tightening fitting for tightening the separator 98. The tightening member 99 is a member with which the separator 98 can be screwed.

[0031] A disc plate 99B is attached to the base end portion 99A of the tightening member 99. When the separator 98 is screwed to the tightening member 99 with the separator 98 inserted into the insertion hole 23E, the disc plate 99B presses the formwork 10 from the outer Y2 side.

[0032] In this way, when the separator 98 is screwed to the tightening member 99 with the separator 98 inserted into the insertion hole 23E, the P - connector 98B presses the formwork 10 from the inner Y1 side, and the disc plate 99B presses the formwork 10 from the outer Y2 side. In this way, the formwork 10 is clamped in the thickness direction Y by the P - connector 98B and the disc plate 99B. Thereby, the formwork 10 is held between the P - connector 98B and the disc plate 99B.

[0033] The column portion 22 is provided with a protruding portion 24. The protruding portion 24 extends along the width direction X from the column main body 23. The protruding portion 24 is configured to protrude in the width direction X from the column main body 23. The protruding portion 24 is configured as a flange portion that protrudes in the width direction X from the column main body 23. The protruding portion 24 may be at the same height as the column main body 23 in the vertical direction Z.

[0034] The protruding portion 24 may include a first inner protruding portion 24A, a first outer protruding portion 24B, a second inner protruding portion 24C, and a second outer protruding portion 24D. The first inner protruding portion 24A is the first side wall surface 23C of the column main body 23 and extends in the first width direction X1 from the inner wall surface 23A side of the column main body 23. The first outer protruding portion 24B is the first side wall surface 23C of the column main body 23 and extends in the first width direction X1 from the outer wall surface 23B side of the column main body 23. The second inner protruding portion 24C is the second side wall surface 23D of the column main body 23 and extends in the second width direction X2 from the inner wall surface 23A side of the column main body 23. The second outer protruding portion 24D is the second side wall surface 23D of the column main body 23 and extends in the second width direction X2 from the outer wall surface 23B side of the column main body 23.

[0035] The first side wall surface 23C, the first inner protruding portion 24A, and the first outer protruding portion 24B constitute a first holding portion 25A. The first holding portion 25A is configured to hold the weir plate 90 in the first width direction X1. The first holding portion 25A is configured to cover the side end portion 93 of the weir plate 90 in the first width direction X1.

[0036] The second side wall surface 23D, the second inner protruding portion 24C, and the second outer protruding portion 24D constitute a second holding portion 25B. The second holding portion 25B is configured to hold the weir plate 90 in the second width direction X2. The second holding portion 25B is configured to cover the side end portion 93 of the weir plate 90 in the second width direction X2. The first holding portion 25A and the second holding portion 25B constitute the holding portion 25.

[0037] The lower column 20 includes a mounting portion 26. That is, the column 12 includes a mounting portion 26. The mounting portion 26 extends outward Y2 from the outer wall surface 23B of the column main body 23. The mounting portion 26 is capable of mounting the support portion 14. The mounting portion 26 may be a latch. The mounting portion 26 may include a mounting hole 26A. The mounting hole 26A is a hole into which the support portion 14 can be inserted.

[0038] As shown in FIGS. 1 and 4, the column 12 includes a lower corner column 30. The lower corner column 30 is disposed at the lower stage of the formwork 10. The lower corner column 30 is a column for arranging the formwork 10 in an L shape. The lower corner column 30 is a column constituting the corner of the formwork 10. The lower corner column 30 is an example of a column constituting the outer corner of the formwork 10, but may also be a column constituting the inner corner of the formwork 10.

[0039] As shown in FIG. 4, the lower corner column 30 has the same configuration as the lower column 20. Therefore, hereinafter, the lower corner column 30 will be described centering on the configuration different from that of the lower column 20. The lower corner column 30 includes a base portion 31, a column portion 32, and a mounting portion 36, in the same manner as the lower column 20. Different from the base portion 21, the base portion 31 extends outward in the Y2 direction and in the second width direction X2 from the lower end portion 32A of the column portion 32. The column portion 32 includes a column main body 33. Different from the column main body 23, the column main body 33 does not have an insertion hole.

[0040] The column portion 32 includes a protruding portion 34. The protruding portion 34 includes a first inner protruding portion 34A, a first outer protruding portion 34B, a second inner protruding portion 34C, and a second outer protruding portion 34D. The second inner protruding portion 34C is the inner wall surface 33A of the column main body 33 and extends inward in the Y1 direction from the first side wall surface 33C side of the column main body 33. The second outer protruding portion 34D is the inner wall surface 33A of the column main body 23 and extends inward in the Y1 direction from the second side wall surface 33D side of the column main body 33.

[0041] The inner wall surface 33A, the second inner protruding portion 34C, and the second outer protruding portion 34D constitute a second holding portion 35B. The second holding portion 35B is configured to hold the weir plate 90 in the Y1 direction. The second holding portion 35B is configured to cover the side end portion 93 of the weir plate 90 in the Y1 direction. The first holding portion 35A and the second holding portion 35B constitute a holding portion 35.

[0042] Unlike the lower column 20, the lower corner column 30 is provided with a plurality of attachment portions 36. That is, the column 12 is provided with a plurality of attachment portions 36. Unlike the lower column 20, the lower corner column 30 may be provided with two attachment portions 36. One attachment portion 36 extends outward in the Y2 direction from the outer wall surface 33B of the column body 33. The other attachment portion 36 extends in the X2 direction from the second side wall surface 33D of the column body 33.

[0043] As shown in FIGS. 1 and 5, the column 12 includes an upper column 40. The upper column 40 is disposed at the upper stage of the formwork 10. The upper column 40 is a column for disposing the weir plates 90 on both sides in the width direction X.

[0044] As shown in FIG. 5, the upper column 40 has the same configuration as the lower column 20. Therefore, hereinafter, the upper column 40 will be described centering on the configuration different from that of the lower column 20. Similar to the lower column 20, the upper column 40 includes a column portion 42 and an attachment portion 46. Unlike the lower column 20, the upper column 40 does not include a base portion. The column portion 42 includes a column body 43 and a protruding portion 44, similar to the lower column 20.

[0045] Unlike the lower column 20, the column portion 42 is configured such that the protruding portion 44 is longer downward in the Z2 direction than the column body 43. Unlike the lower column 20, the upper column 40 includes a connecting portion 47. The connecting portion 47 is located at the lower end portion 42A of the column portion 42. The connecting portion 47 is constituted by the protruding portion 44. The connecting portion 47 is configured such that the upper column 40 is connected to the lower column 20. The connecting portion 47 is connected to the lower column 20 so as to cover the transverse member 13.

[0046] As shown in FIGS. 1 and 6, the column 12 includes an upper corner column 50. The upper corner column 50 is disposed at the upper stage of the formwork 10. The upper corner column 50 is a column for disposing the formwork 10 in an L shape. The upper corner column 50 is a column constituting a corner portion of the formwork 10. The upper corner column 50 is an example of a column constituting an outer corner portion of the formwork 10, but may be a column constituting an inner corner portion of the formwork 10.

[0047] As shown in FIG. 6, the upper corner column 50 has the same configuration as the lower corner column 30. Therefore, hereinafter, the upper corner column 50 will be described centering on the configuration different from that of the lower corner column 30. The upper corner column 50 includes a column portion 52 and a mounting portion 56, similar to the lower corner column 30. Unlike the lower corner column 30, the upper corner column 50 does not have a base portion. The column portion 52 includes a column main body 53 and a protruding portion 54, similar to the lower corner column 30.

[0048] Unlike the lower corner column 30, the column portion 52 is configured such that the protruding portion 54 is longer downward in the Z2 direction than the column main body 53. Unlike the lower corner column 30, the upper corner column 50 includes a connecting portion 57. The connecting portion 57 is located at the lower end portion 52A of the column portion 52. The connecting portion 57 is constituted by the protruding portion 54. The connecting portion 57 is configured such that the upper corner column 50 is connected to the lower corner column 30. The connecting portion 57 is connected to the lower corner column 30 so as to cover the horizontal member 13.

[0049] <Configuration of the horizontal member 13> As shown in FIGS. 1, 2, and 7, the horizontal member 13 is a beam member extending in the width direction X. The horizontal member 13 may have the same width as the weir plate 90 in the width direction X. The horizontal member 13 connects the upper weir plate 90 and the lower weir plate 90 in the vertical direction Z. That is, the horizontal member 13 connects the weir plates 90 to each other in the vertical direction Z. In particular, the horizontal member 13 connects the lower end portion 95 of the upper weir plate 90 and the upper end portion 94 of the lower weir plate 90 in the vertical direction Z. The horizontal member 13 connects the lower end portion 95 of the upper weir plate 90 and the upper end portion 94 of the lower weir plate 90 in the vertical direction Z so as to cover them.

[0050] As shown in FIG. 7, the horizontal member 13 includes a beam main body 63. The beam main body 63 extends in the width direction X. The beam main body 63 may have a square column shape. The beam main body 63 includes a first end portion 63A and a second end portion 63B. The first end portion 63A is the end portion of the beam main body 63 on the first width direction X1 side. The second end portion 63B is the end portion of the beam main body 63 on the second width direction X2 side.

[0051] The beam body 63 includes an upper surface 63C, a bottom surface 63D, an inner wall surface 63E, and an outer wall surface 63F. The upper surface 63C is a surface facing upward Z1 of the beam body 63. The bottom surface 63D is a surface facing downward Z2 of the beam body 63. The inner wall surface 63E is a surface facing inward Y1 of the beam body 63. The outer wall surface 63F is a surface facing outward Y2 of the beam body 63.

[0052] The beam body 63 includes a first notch portion 67A. The first notch portion 67A is provided on the upper surface 63C side at the first end portion 63A. The beam body 63 includes a second notch portion 67B. The second notch portion 67B is provided on the bottom surface 63D side at the second end portion 63B.

[0053] A plurality of transverse members 13 adjacent to each other in the width direction X are arranged such that the first notch portion 67A of one transverse member 13 and the second notch portion 67B of the other transverse member 13 overlap in the vertical direction Z. A plurality of transverse members 13 adjacent to each other in the width direction X are arranged such that the first notch portion 67A of one transverse member 13 and the second notch portion 67B of the other transverse member 13 are in contact with each other in the vertical direction Z. Thereby, the first notch portion 67A of one transverse member 13 supports the second notch portion 67B of the other transverse member 13. In this way, the plurality of transverse members 13 are connected along the width direction X. That is, the plurality of transverse members 13 are connected along the horizontal direction.

[0054] The transverse member 13 includes a protruding portion 64. The protruding portion 64 extends along the vertical direction Z from the beam body 63. The protruding portion 64 is configured to protrude from the beam body 63 in the vertical direction Z. The protruding portion 64 is configured as a flange portion that protrudes from the beam body 63 in the vertical direction Z. The protruding portion 64 is shorter than the beam body 63 in the width direction X, but may have the same length as the beam body 63 in the width direction X.

[0055] The protruding portion 64 includes a first inner protruding portion 64A, a first outer protruding portion 64B, a second inner protruding portion 64C, and a second outer protruding portion 64D. The first inner protruding portion 64A is the upper surface 63C of the beam body 63 and extends upward Z1 from the inner wall surface 63E side of the beam body 63. The first outer protruding portion 64B is the upper surface 63C of the beam body 63 and extends upward Z1 from the outer wall surface 63F side of the beam body 63. The second inner protruding portion 64C is the bottom surface 63D of the beam body 63 and extends downward Z2 from the inner wall surface 63E side of the beam body 63. The second outer protruding portion 64D is the bottom surface 63D of the beam body 63 and extends downward Z2 from the outer wall surface 63F side of the beam body 63.

[0056] The first inner protruding portion 64A, the first outer protruding portion 64B, and the upper surface 63C of the beam body 63 constitute a first holding portion 65A. The first holding portion 65A is configured to hold the weir plate 90 at the upper Z1. The first holding portion 65A is configured to cover the lower end portion 95 of the weir plate 90 at the upper Z1.

[0057] The second inner protruding portion 64C, the second outer protruding portion 64D, and the bottom surface 63D of the beam body 63 constitute a second holding portion 65B. The second holding portion 65B is configured to hold the weir plate 90 at the lower Z2. The second holding portion 65B is configured to cover the upper end portion 94 of the weir plate 90 at the lower Z2. The first holding portion 65A and the second holding portion 65B constitute a holding portion 65.

[0058] <Configuration of the support portion 14> As shown in FIG. 1, the support portion 14 extends in the width direction X. The support portion 14 can be attached to the attachment portions 26, 36, 46, 56. The support portion 14 can be attached to the attachment portions 26, 36, 46, 56 in a state of being in contact with the outer wall surface 92 of the weir plate 90. That is, the support portion 14 is a support member that horizontally supports the weir plate 90 from the outer wall surface 92 side of the weir plate 90. The support portion 14 may be a latch.

[0059] <Operation of the first embodiment> The operation of the first embodiment will be described. As shown in Fig. 8(A), as a formwork installation method, on-site, the operator installs the lower column 20, the lower corner column 30, and the lower weir plate 90 on the installation surface 97. In this case, the side end portion 93 of the lower weir plate 90 is held so as to be covered by the holding portion 25 of the lower column 20 and the holding portion 35 of the lower corner column 30. In this way, the lower column 12 holds the lower weir plate 90 horizontally from the side to cover the side end portion 93 of the lower weir plate 90. That is, the operator holds the weir plate 90 horizontally against the column 12 so as to cover the side end portion 93 of the weir plate 90. Then, the operator positions the lower column 20 and the lower corner column 30 using the separator 98 and the fastening member 99.

[0060] Next, as shown in Fig. 8(B), the operator attaches the support portion 14 to the attachment portion 26 of the lower column 20 and the attachment portion 36 of the lower corner column 30. Thereby, the support portion 14 supports the lower weir plate 90 inward in the Y1 direction from the outer wall surface 92 side of the lower weir plate 90.

[0061] Next, as shown in Fig. 9(A), the operator installs the cross member 13 above the weir plate 90 in the Z1 direction. Specifically, the operator installs the cross member 13 above the weir plate 90 in the Z1 direction such that the second holding portion 65B of the cross member 13 covers the upper end portion 94 of the lower weir plate 90. That is, the operator installs the cross member 13 above the weir plate 90 in the Z1 direction so as to cover the upper end portion 94 of the weir plate 90. Also, among a plurality of adjacent cross members 13, the operator installs the cross member 13 above the weir plate 90 in the Z1 direction such that the first notch portion 67A of one cross member 13 and the second notch portion 67B of the other cross member 13 overlap in the vertical direction Z.

[0062] Next, as shown in FIG. 9(B), the operator installs the upper column 40, the upper corner column 50, and the upper weir plate 90 above Z1 of the lower column 20, the lower corner column 30, and the weir plate 90. In this case, the connecting portion 47 of the upper column 40 is connected above Z1 of the lower column 20. The connecting portion 57 of the upper corner column 50 is connected above Z1 of the upper corner column 50. Also, the side end portion 93 of the upper weir plate 90 is held so as to be covered by the holding portion 45 of the upper column 40 and the holding portion 55 of the upper corner column 50. In this way, the upper column 12 holds the upper weir plate 90 horizontally from the side so as to cover the side end portion 93 of the upper weir plate 90. That is, the operator holds the weir plate 90 horizontally from the side so that the weir plate 90 is held by the column 12 so as to cover the side end portion 93 of the weir plate 90.

[0063] Also, the operator installs the weir plate 90 above Z1 of the cross member 13 so that the first holding portion 65A of the cross member 13 covers the lower end portion 95 of the upper weir plate 90. That is, the operator connects the upper weir plate 90 above Z1 of the cross member 13 so as to cover the lower end portion 95 of the upper weir plate 90. Then, the operator positions the upper column 40 and the upper corner column 50 using the separator 98 and the fastening member 99.

[0064] Finally, as shown in FIG. 1, the operator attaches the support portion 14 to the attachment portion 46 of the upper column 40 and the attachment portion 56 of the upper corner column 50. Thereby, the support portion 14 supports the upper weir plate 90 inward in the Y1 direction from the outer wall surface 92 side of the upper weir plate 90.

[0065] After installing such a formwork 10, fresh concrete is poured into the space sandwiched by the formwork 10. In this case, the weir plate 90 is composed of cardboard having water resistance on the surface. Also, the end portion of the weir plate 90 is covered by the holding portions 25, 35, 45, 55 of the column 12 and the holding portion 65 of the cross member 13. Therefore, it is possible to suppress the moisture contained in the fresh concrete from soaking into the inside of the weir plate 90 from the surface of the weir plate 90.

[0066] <Effect of the First Embodiment> The effect of the first embodiment will be described. (1) The support column 12 holds the cardboard weir plate 90 horizontally from the side to cover the side end 93 of the weir plate 90 made of cardboard. The cross member 13 connects the weir plates 90 in the vertical direction Z so as to cover the upper end 94 and the lower end 95 of the weir plates 90. Therefore, it is possible to suppress the intrusion of moisture from the side end 93, the upper end 94, and the lower end 95 of the weir plate 90. Thereby, the deformation of the weir plate 90 can be suppressed. Therefore, even when using the weir plate 90 made of cardboard, it is possible to suppress a decrease in the accuracy of the concrete structure.

[0067] Also, by using the weir plate 90 made of cardboard, weight reduction can be achieved. Therefore, the installation efficiency of the formwork 10 can be improved. In particular, by holding the weir plate 90 at the holding portions 25, 35, 45, 55 of the support column 12 and the holding portion 65 of the cross member 13, the weir plate 90 can be supported. Therefore, the installation efficiency of the formwork 10 can be improved. Also, by using the weir plate 90 made of cardboard, it is possible to reduce the environmental load.

[0068] (2) The support column 12 is provided with insertion holes 23E, 43E through which one end 98A of the separator 98 can be inserted. For this reason, it is not necessary to provide the insertion holes 23E, 43E in the weir plate 90 itself. Thereby, the intrusion of moisture into the weir plate 90 can be suppressed. Thereby, the deformation of the weir plate 90 can be suppressed. Therefore, even when using the weir plate 90 made of cardboard, it is possible to suppress a decrease in the accuracy of the concrete structure.

[0069] (3) The support portion 14 supports the weir plate 90 inwardly in the Y1 direction from the outer wall surface 92 side of the weir plate 90. The support column 12 is provided with attachment portions 26, 36, 46, 56 to which the support portion 14 can be attached. Thereby, the deformation of the weir plate 90 can be suppressed. Therefore, even when using the weir plate 90 made of cardboard, it is possible to suppress a decrease in the accuracy of the concrete structure.

[0070] [Modified Example] This embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0071] · The cross - beam 13 may be configured such that the cross - beams 13 adjacent to each other in the width direction X are connected without using the first notch 67A and the second notch 67B. To give a specific example, the cross - beam 13 may be connected such that the convex portion provided at the first end portion 63A and the concave portion provided at the second end portion 63B engage with each other, so that the cross - beams 13 adjacent to each other in the width direction X are connected.

[0072] · The cross - beam 13 may be configured to be supported by the support column 12. In this case, the cross - beam 13 may not include the first end portion 63A and the second end portion 63B. The cross - beams 13 adjacent to each other in the width direction X may not be connected.

[0073] · In addition to the member having both the first holding portion 65A and the second holding portion 65B, the cross - beam 13 may have a member that does not have either the first holding portion 65A or the second holding portion 65B. To give a specific example, the cross - beam 13 may be configured to include the first holding portion 65A and not include the second holding portion 65B. Such a cross - beam 13 may be arranged to cover the lower end portion 95 of the lower weir plate 90. Thereby, the intrusion of moisture from the lower end portion 95 of the lower weir plate 90 can be suppressed. Also, the cross - beam 13 may be configured to include the second holding portion 65B and not include the first holding portion 65A. Such a cross - beam 13 may be arranged to cover the upper end portion 94 of the uppermost weir plate 90. Thereby, the intrusion of moisture from the upper end portion 94 of the uppermost weir plate 90 can be suppressed.

[0074] · An insertion member such as a wedge may be inserted in the vertical direction Z between the outer wall surface 92 of the weir plate 90 and the support member. Thereby, even when a gap as play is provided between the weir plate 90 and the support member, the weir plate 90 can be stably supported from the side of the outer wall surface 92 of the weir plate 90. That is, the support portion 14 may include the support member and the insertion member.

[0075] · The support member may be attached to the cross member 13 so as to extend in the vertical direction Z. In this case, an insertion member such as a wedge may be inserted in the width direction X between the outer wall surface 92 of the weir plate 90 and the support member.

[0076] · The upper column 12 and the lower column 12 may not be connected in the vertical direction Z. The upper column 12 and the lower column 12 may be integrally formed. In this case, the cross member 13 may be connected to the middle of the column 12 as long as it can cover the upper end portion 94 and the lower end portion 95 of the weir plates 90 in the vertical direction Z.

[0077] · A seal member such as a packing may be provided in at least any one of the holding portions 25, 35, 45, 55, 65. The seal member may have an arbitrary shape, for example, an H shape, or for example, an I shape.

[0078] · As the installation method of the formwork 10, any order may be used. To give a specific example, the operator may install the column 12 after installing the weir plate 90, or may install the weir plate 90 after installing the column 12. After the operator attaches the support portion 14 to the attachment portion 26 of the lower column 20 and the attachment portion 36 of the lower corner column 30, the lower column 20 and the lower corner column 30 may be positioned using the separator 98 and the fastening member 99.

[0079] · The "horizontal direction" in the claims includes not only the horizontal direction but also the substantially horizontal direction as long as it functions as the formwork 10. To give a specific example, as long as it functions as the formwork 10, the cross member 13 itself may be provided in the substantially horizontal direction. As long as it functions as the formwork 10, the weir plate 90 itself may be provided in the substantially horizontal direction. As long as it functions as the formwork 10, the support portion 14 may support the weir plate 90 in the substantially horizontal direction.

[0080] · In the claims, the "vertical direction" includes not only the vertical direction but also the substantially vertical direction as long as the formwork 10 functions as such. To give a specific example, as long as the formwork 10 functions as such, the support column 12 itself may be provided in a substantially vertical direction. As long as the formwork 10 functions as such, the weir plate 90 itself may be provided in a substantially vertical direction.

[0081] · The expression "at least any one" used in this specification means one or more of the desired options. As an example, the expression "at least any one" used in this specification means only one option or both options if the number of options is two. As another example, the expression "at least any one" used in this specification means only one option or any combination of two or more options if the number of options is three or more.

[0082] [Appendix] The technical ideas grasped from the above-described embodiments and modified examples are described below. (A) The support column includes a holding portion that holds the weir plate from the horizontal direction so as to cover a side end portion of the weir plate.

[0083] (B) The cross member includes a holding portion that holds the weir plate from the vertical direction so as to cover a lower end portion of the upper weir plate and an upper end portion of the lower weir plate. (C) The cross member includes a beam body, the beam body has a first notch and a second notch, the first notch is provided on the upper surface side of the beam body at a first end portion of the beam body, the second notch is provided on the bottom surface side of the beam body at a second end portion of the beam body, and a plurality of the cross members are arranged such that the first notch and the second notch are in contact with each other in the vertical direction.

Explanation of Reference Numerals

[0084] 10... formwork, 11... weir plate support structure, 12... support column, 13... cross beam, 14... support part, 20... lower support column, 21, 31... base part, 22, 32, 42, 52... column part, 23, 33, 43, 53... column body, 23E, 43E... insertion hole, 24, 34, 44, 54... protruding part, 25, 35, 45, 55... holding part, 26, 36, 46, 56... mounting part, 30... lower corner support column, 40... upper support column, 47, 57... connecting part, 50... upper corner support column, 63... beam body, 64... protruding part, 65... holding part, 65A... first holding part, 65B... second holding part, 67A... first notch part, 67B... second notch part, 90... weir plate, 91... inner wall surface, 92... outer wall surface, 93... side end part, 94... upper end part, 95... lower end part, 97... installation surface, 98... separator, 99... fastening member.

Claims

1. A support column that holds the weir plate horizontally from the side to cover the side end of the weir plate made of cardboard, A cross member that vertically connects the weir plates to cover the upper and lower ends of the weir plates, A weir plate support structure for a concrete formwork comprising the above.

2. In the weir plate support structure for a concrete formwork according to Claim 1, The support column has an insertion hole through which one end of a separator can be inserted, A weir plate support structure for a concrete formwork.

3. In the weir plate support structure for a concrete formwork according to Claim 1 or Claim 2, It is provided with a support member that supports the weir plate horizontally from the outer wall surface side of the weir plate, The support column has a mounting portion to which the support member can be mounted, A weir plate support structure for a concrete formwork.

4. Holding the weir plate horizontally from the side by the support column so as to cover the side end of the weir plate made of cardboard, Installing a cross member above the weir plate so as to cover the upper end of the weir plate, Connecting the other weir plate above the cross member so as to cover the lower end of the other weir plate, An installation method for a concrete formwork including the above.

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