Formwork for temporary openings

Abstract

To provide temporary opening formwork that is easy to transport to the construction site. [Solution] A temporary opening formwork 1 for forming a rectangular temporary opening 10 in the floor slab of a reinforced concrete building under construction, having four side portions 12a, 12b that form the outer perimeter of the temporary opening 10, each side portion 12a, 12b consisting of a formwork plate 15 arranged on the four sides of the rectangle and connecting members 16, 17 attached to both ends of the formwork plate 15, each connecting member 16, 17 having a first plate portion that extends in the same direction as the formwork plate 15 and is fixed to both ends of the formwork plate 15, and a second plate portion that protrudes from the first plate portion so as to bend inward in the rectangle, and in the four corners of the rectangle, one connecting member 16 and the other connecting member 17 are combined with each other, and a slit is formed in the second plate portion of one connecting member 16 for inserting the second plate portion of the other connecting member 17.

Description

Technical Field

[0007]

[0001] The present invention relates to a formwork for a temporary opening that forms a temporary opening for transporting construction materials or the like in a floor slab of a reinforced concrete building.

Background Art

[0002] In the construction work of reinforced concrete buildings such as condominiums, a temporary opening is formed in the floor slab using a formwork for a temporary opening in order to transport construction materials or the like. This temporary opening is closed with concrete after the materials are transported, and the floor slab is completed.

[0003] For example, Patent Document 1 discloses a formwork for a temporary opening in which the four corners of the side surface portion forming the outer periphery of the temporary opening are connected by corner connecting members.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By using the formwork for a temporary opening of Patent Document 1 described above, it becomes possible to easily form a temporary opening in the floor slab of a reinforced concrete building.

[0006] An object of the present invention is to provide a formwork for a temporary opening that is easy to carry into the site and can be easily and accurately assembled on site.

Means for Solving the Problems

[0007] To solve the above problems, the present invention provides a formwork for a temporary opening for forming a rectangular temporary opening in a floor slab of a reinforced concrete building under construction, the formwork having four side portions that form the outer perimeter of the temporary opening, each side portion consisting of formwork plates arranged on the four sides of the rectangle and connecting members attached to both ends of the formwork plates, the connecting member having a first plate portion extending in the same direction as the formwork plate and fixed to both ends of the formwork plate, and a second plate portion provided protruding from the first plate portion so as to bend inward in the rectangle, and in the four corner portions of the rectangle, one connecting member and the other connecting member are combined with each other, and the second plate portion of one connecting member has a slit formed therein for inserting the second plate portion of the other connecting member.

[0008] In this temporary opening formwork, bolt insertion holes may be provided opposite each other in the second plate portion of one connecting member and the first plate portion of the other connecting member. Furthermore, a rebar receiving portion may be formed on the side of the second plate portion of both the one connecting member and the other connecting member for holding anchoring bars that integrate the temporary opening with the surrounding concrete. [Effects of the Invention]

[0009] In the temporary opening formwork of the present invention, by inserting the second plate portion of one connecting member into the slit formed in the second plate portion of one connecting member, each side portion can be easily and accurately assembled into a rectangular shape at the construction site. Furthermore, before transporting the formwork to the construction site, the side portions can be left disassembled rather than assembled into a rectangular shape, making it less bulky and easier to transport to the site. [Brief explanation of the drawing]

[0010] [Figure 1] This is a plan view showing an example of the installation of a formwork for a temporary opening according to an embodiment of the present invention. [Figure 2]This is a perspective view showing a formwork for a temporary opening according to an embodiment of the present invention, showing the state before each of the four side sections is assembled. [Figure 3] This is an explanatory diagram of the formwork. [Figure 4] This is a diagram illustrating one of the connecting members. [Figure 5] This is an explanatory diagram of the other connecting member. [Figure 6] This is an explanatory diagram showing the state in which one connecting member and the other connecting member are combined. [Figure 7] This is a magnified view of the four corners of a temporary opening formwork according to an embodiment of the present invention, showing the state in which one connecting member and the other connecting member are combined. [Figure 8] This is a perspective view of a formwork for a temporary opening according to an embodiment of the present invention in which the temporary opening is square, and shows an example in which the formwork is formed in the shape of a flat plate. [Figure 9] This is a perspective view of a temporary opening formwork according to an embodiment of the present invention in which the temporary opening is square, and shows an example in which the formwork is composed of a mesh-like formwork body and convex ribs extending in the vertical direction. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. In this specification and the drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant explanations will be omitted.

[0012] The present invention relates to a temporary opening formwork 1 for forming a rectangular temporary opening 10 in the floor slab of a reinforced concrete building under construction. As shown in Figure 1, the reinforcement bars 11 embedded in the floor slab are arranged in a grid pattern, and the temporary opening formwork 1 is placed inside these reinforcement bars 11. A rectangular temporary opening 10 is formed inside the temporary opening formwork 1. The temporary opening 10 formed in the floor slab by the temporary opening formwork 1 is closed by pouring concrete after it has served its purpose.

[0013] As shown in Fig. 2, the temporary opening formwork 1 has side faces 12a, 12a, 12b, 12b on each of the four sides forming the outer periphery of the temporary opening 10. In this embodiment, in the rectangular temporary opening 10, there are a pair of opposing side faces 12a, 12a arranged in the long side direction and a pair of opposing side faces 12b, 12b arranged in the short side direction.

[0014] Each of the side faces 12a, 12a, 12b, 12b consists of a partition plate 15 and connecting members 16, 17 attached to both ends of the partition plate 15. The partition plate 15 is arranged on each of the four rectangular sides forming the temporary opening 10. Note that the length of the partition plate 15 of the side faces 12a, 12a arranged in the long side direction is longer than the length of the partition plate 15 of the side faces 12b, 12b arranged in the short side direction.

[0015] In this embodiment, as shown in Fig. 3, the partition plate 15 has a structure in which a mesh - shaped partition plate body 20 and convex ribs 21 extending in the vertical direction are integrally formed alternately. The convex ribs 21 protrude inward in the rectangular temporary opening 10.

[0016] Each of the side faces 12a, 12a, 12b, 12b (partition plate 15) is connected to each other by connecting members 16, 17 at the four rectangular corners. In this embodiment, one connecting member 16 is attached to both ends of the partition plate 15 (the partition plate 15 with a longer length) of the side faces 12a, 12a arranged in the long side direction, and the other connecting member 17 is attached to both ends of the partition plate 15 (the partition plate 15 with a shorter length) of the side faces 12b, 12b arranged in the short side direction.

[0017] As shown in Fig. 4, one connecting member 16 has a first plate portion 25 fixed to both ends of the baffle plate 15 (the baffle plate 15 with a long length), and a second plate portion 26 provided so as to bend inward from the tip of the first plate portion 25. The first plate portion 25 of one connecting member 16 extends and is respectively arranged in the same direction as the baffle plate 15 (the rectangular long side direction of the temporary opening 10) at both ends of the baffle plate 15, and its second plate portion 26 protrudes so as to bend almost at a right angle inward from the tip of the first plate portion 25.

[0018] A slit 27 for inserting the second plate portion 31 of the other connecting member 17 described later is formed in the second plate portion 26 of one connecting member 16. Further, a bolt insertion hole 28 is provided in the second plate portion 26 of one connecting member 16.

[0019] Also, in one connecting member 16, a reinforcing bar receiving portion 29 for holding the fixing rib 45 described later is formed in its first plate portion 25 on the side of the second plate portion 26.

[0020] As shown in Fig. 5, the other connecting member 17 has a first plate portion 30 fixed to both ends of the baffle plate 15 (the baffle plate 15 with a short length), and a second plate portion 31 provided so as to bend inward from the tip of the first plate portion 30. The first plate portion 30 of the other connecting member 17 extends and is respectively arranged in the same direction as the baffle plate 15 (the rectangular short side direction of the temporary opening 10) at both ends of the baffle plate 15, and its second plate portion 31 protrudes so as to bend almost at a right angle inward from the tip of the first plate portion 30.

[0021] The second plate portion 31 of the other connecting member 17 has a size (width) that allows it to be inserted into the slit 27 formed in the second plate portion 26 of the other connecting member 16, as described earlier. Furthermore, the first plate portion 30 of the other connecting member 17 is provided with a bolt insertion hole 32. As will be described later, when connecting the one connecting member 16 and the other connecting member 17, the bolt insertion hole 28 provided in the second plate portion 26 of the one connecting member 16 and the bolt insertion hole 32 provided in the first plate portion 30 of the other connecting member 17 are positioned opposite each other.

[0022] Furthermore, in the other connecting member 17, a reinforcing bar receiving portion 33 for holding the anchoring reinforcement 45, which will be described later, is formed on the first plate portion 30 on the side of the second plate portion 31.

[0023] These two connecting members, one 16 and the other 17, are connected as shown in Figures 6 and 7. Specifically, a pair of side portions 12a, 12a are arranged facing each other in the long-side direction of the rectangle to form a temporary opening 10, and a pair of side portions 12b, 12b are arranged facing each other in the short-side direction of the rectangle. At each of the four corners of the rectangular temporary opening 10, the second plate portion 31 of the other connecting member 17, which is attached to the end of the side portion 12b, is inserted into the slit 27 formed in the second plate portion 26 of the one connecting member 16, which is attached to the end of the side portion 12a. By combining the one connecting member 16 and the other connecting member 17 at each of the four corners of the temporary opening 10 in this way, a rectangular temporary opening 10 can be formed.

[0024] Furthermore, with one connecting member 16 and the other connecting member 17 combined in this manner, the combined state of the one connecting member 16 and the other connecting member 17 can be maintained by passing a bolt 40 through the bolt insertion hole 28 provided in the second plate portion 26 of the one connecting member 16 and the bolt insertion hole 32 provided in the first plate portion 30 of the other connecting member 17, and attaching a nut 41 to the tip of the bolt 40.

[0025] Furthermore, in the temporary opening formwork 1 according to the embodiment of the present invention, with one connecting member 16 and the other connecting member 17 combined to form a rectangular temporary opening 10, the anchoring bars 45 can be held in the rebar receiving portion 29 formed on the first plate portion 25 of the one connecting member 16 and the rebar receiving portion 33 formed on the first plate portion 30 of the other connecting member 17, respectively. The anchoring bars 45 are constructed, for example, by crimping steel pipe sleeves as anchoring members to both ends of a D13 reinforcing bar of a different diameter. In this way, by holding the anchoring bars 45 in the temporary opening formwork 1 and embedding the anchoring bars 45 in the floor slab as shown in Figure 1, the temporary opening formwork 1 (temporary opening 10) can be integrated with the surrounding concrete (floor slab).

[0026] Thus, the temporary opening formwork 1 according to the embodiment of the present invention configured as described above allows for the easy assembly of the four side portions 12a, 12a, 12b, 12b into a rectangular shape at the construction site, etc., by inserting the second plate portion 31 of the other connecting member 17 into the slit 27 formed in the second plate portion 26 of one connecting member 16, etc., thereby forming a temporary opening 10. Construction materials and the like can then be easily transported through the temporary opening 10 thus formed at the construction site, etc.

[0027] Furthermore, the temporary opening formwork 1 according to the embodiment of the present invention can be transported to the site or other location without taking up much space by leaving the four side sections 12a, 12a, 12b, 12b separate before being assembled into a rectangular shape.

[0028] Preferred embodiments of the present invention have been described above, but the present invention is not limited to these examples. It will be obvious to those skilled in the art that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these will naturally also fall within the technical scope of the present invention.

[0029] For example, the formwork 15 is not limited to a mesh shape; it can also be flat. Furthermore, the provision of convex ribs 21 on each side section 12a, 12a, 12b, 12b (formwork 15) ensures high rigidity and suppresses deformation when subjected to lateral pressure during concrete placement. Additionally, the contact area between the pre-cast concrete around the temporary opening 10 and the post-cast concrete placed in the temporary opening 10 is increased, enhancing integration. By installing waterproofing rubber or similar material around the entire circumference of the upper part of each side section 12a, 12a, 12b, 12b, waterproofing performance can be achieved after the temporary opening 10 is closed. The number of anchoring bars 45 is determined appropriately depending on the size of the temporary opening 10 and the intended use of the building. Wire mesh may also be installed before the post-cast concrete is placed in the temporary opening 10.

[0030] Furthermore, in the temporary opening formwork 1 of the present invention, as shown in Figures 8 and 9, the temporary opening 10 may be a square with four sides of equal length. In the configurations shown in Figures 8 and 9, each of the four side portions 12 (formwork panels 15) forming the outer perimeter of the temporary opening 10 is of equal length. The configuration shown in Figure 8 is an example in which the formwork panels 15 are formed in the shape of a flat plate, while the configuration shown in Figure 9 is an example in which the formwork panels 15 are arranged alternately with a mesh-like formwork panel body 20 and convex ribs 21 extending in the vertical direction. The length of each side portion 12 (formwork panels 15) can be appropriately set according to the size and shape of the temporary opening 10. [Industrial applicability]

[0031] The present invention can be applied to temporary opening formwork used when forming temporary openings in the floor slab of a reinforced concrete building. [Explanation of symbols]

[0032] 1. Formwork for temporary openings 10 Temporary openings 11 Reinforcement 12a, 12b side part 15 formwork 16 One connecting member 17 Other connecting member 20 Formwork Body 21 Convex ribs 25 First Plate Section 26 Second Plate Section 27 slits 28 bolt insertion holes 29 Reinforcement support section 30 First Plate Section 31 Second plate section 32 bolt insertion holes 33 Reinforcement support section 40 volts 41 Nuts 45 Stabilizing muscles

Claims

1. A formwork for a temporary opening, used to form a rectangular temporary opening in the floor slab of a reinforced concrete building under construction, Having side portions on each of the four sides that form the outer perimeter of the temporary opening, Each of the aforementioned side sections consists of a formwork plate arranged on the four sides of a rectangle and connecting members attached to both ends of the formwork plate. The connecting member has a first plate portion that extends in the same direction as the formwork and is fixed to both ends of the formwork, and a second plate portion that protrudes from the first plate portion so as to bend inward in a rectangular shape. A formwork for a temporary opening, characterized in that, in the four rectangular corners where one connecting member and the other connecting member are joined together, the second plate portion of one connecting member has a slit formed therein for inserting the second plate portion of the other connecting member.

2. The temporary opening formwork according to claim 1, characterized in that bolt insertion holes are provided opposite each other in the second plate portion of one connecting member and the first plate portion of the other connecting member.

3. The temporary opening formwork according to claim 1, characterized in that one connecting member and the other connecting member have reinforcing bar receiving portions formed on the side of the second plate portion for holding anchoring bars that integrate the temporary opening and the surrounding concrete.

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