Fixing metal fitting

Abstract

To provide a fixing metal fitting which regulates a panel plate erected on a fixing surface to a predetermined position of the fixing surface, which can be manufactured at low cost, and which can prevent floating of the panel plate.SOLUTION: A fixing metal fitting for preventing a panel board from floating up with respect to a fixing surface, the fixing metal fitting including a regulating member having a base portion that abuts against and is fixed to the fixing surface and an engaging portion formed to rise from the base portion, and a pressing member that has an insertion hole through which the engaging portion of the regulating member passes and is combined with the regulating member, and that protrudes upward from a part of the panel board, when the pressing member is combined with the regulating member, an edge of the insertion hole comes into contact with an outer edge of the engaging portion and is locked to the regulating member, and the pressing member comes into contact with a part of the panel plate and prevents the panel plate from floating with respect to the fixing surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fixing fixture that restricts the position of a panel plate relative to a fixing surface. [Background technology]

[0002] Concrete pouring work is carried out when constructing buildings made of reinforced concrete or steel-reinforced concrete. Concrete pouring work involves pouring concrete into a formwork formed by arranging multiple formwork panels on concrete that has been cast on the ground, or what is known as a concrete floor plate, and molding the concrete into the designed shape.

[0003] One example of concrete pouring work is formwork work to cast building foundations. Formwork work is carried out using a formwork in which formwork panels are arranged to match the shape of the target concrete structure. The formwork panels are arranged on the inside and outside of the area where the building foundation will be cast, and a filling space for fresh concrete is formed between the formwork panel arranged on the inside and the formwork panel arranged on the outside. The inside and outside formwork panels are held at a fixed distance by separators.

[0004] When the filling space is filled with fresh concrete, the lateral pressure of the fresh concrete acts on the form panel. The lateral pressure acting on the form panel is stronger on the lower side of the form panel than on the upper side of the form panel. Therefore, a force that tries to push the form panel out horizontally acts on the lower side of the form panel, as well as a force that lifts it diagonally upward. If the form panel lifts up, it can cause poor molding of the poured concrete or the form itself to collapse, so contractors use various methods to prevent the form panel from lifting up. One example of a method for preventing the form panel from lifting up is the invention of Patent Document 1.

[0005] Patent Document 1 discloses a formwork clamp that presses and fixes a formwork to a fixed surface. This formwork clamp is used to clamp a formwork having a retaining surface for fresh concrete, an extension perpendicular to the retaining surface, and a rib extending parallel to the retaining surface. The formwork clamp has a presser portion that contacts the upper surface of the extension portion with its face, a straddling portion that straddles the rib to secure the formwork clamp, a rib contact portion that abuts the side of the rib, and a fixing portion that is nailed to the fixing surface. When using the formwork clamp, the presser portion is brought into face contact with the upper surface of the extension portion of the formwork, and the fixing portion is nailed to the fixing surface with the straddling portion straddling the rib. The upper surface of the extension portion is pressed by the presser portion, while the fixing portion is fixed to the fixing surface. Therefore, the formwork clamp can prevent the formwork from lifting up. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2017-203354 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the formwork clamp of Patent Document 1 has a complex shape, which results in high manufacturing costs and affects the product's sales price. Furthermore, while a large number of formwork clamps are required for a single formwork construction project, they are consumables and must be replaced periodically. Therefore, there is a problem that using the formwork clamp at a construction site imposes a heavy financial burden on the construction company. Furthermore, the straddling portion of the formwork clamp is fixed to the formwork clamp and cannot be adjusted in height, which means that it cannot be used when the fixing surface is uneven.

[0008] Furthermore, at actual construction sites, formwork lift-up is prevented by directly fixing the bottom end of the formwork to the concrete floor slab with nails, or by placing battens on the bottom end of the formwork and then fixing the battens to the concrete floor slab with nails, etc. However, these methods are cumbersome, and therefore a low-cost, simple method for preventing formwork lift-up has been desired at formwork construction sites. [Means for solving the problem]

[0009] The present invention has been made in consideration of such problems, and its purpose is to provide a fixing bracket that restricts a panel board that is erected on a fixed surface to a predetermined position on the fixed surface, which can be manufactured at low cost and can prevent the panel board from floating up.

[0010] In other words, the present invention is a fixing bracket that prevents a panel board placed on a fixed surface from floating up, and the fixing bracket comprises a regulating member having a base portion that abuts against the fixed surface and is fixed thereto, and an engaging portion that rises from the base portion, and a pressing member that has an insertion hole through which the engaging portion of the regulating member passes and is combined with the regulating member and protrudes from above relative to a portion of the panel board, and when the pressing member is combined with the regulating member, the edge of the insertion hole abuts against the outer edge of the engaging portion to engage with the regulating member, and abuts against a portion of the panel board to prevent the panel board from floating up relative to the fixing surface. [Effects of the Invention]

[0011] According to the fixing bracket of the present invention, a restricting member can be placed on a fixing surface on which a panel board is placed, and a pressing member can be assembled to the restricting member. In this case, the edge of the insertion hole of the pressing member abuts against the outer edge of the engagement portion of the restricting member, and the pressing member is locked to the restricting member. Furthermore, when assembled to the restricting member, the pressing member abuts against a portion of the panel board. Therefore, when a force acts on the pressing member to lift it from the contact point with the panel board, a force acts to lift the pressing member upward via the panel board, while frictional resistance is generated at the contact point between the insertion hole and the engagement portion. This frictional resistance restricts movement of the pressing member relative to the restricting member, and the fixing bracket can prevent the panel board from lifting up. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is an exploded perspective view of a fastener according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view showing a state in which a fastening member according to a first embodiment of the present invention is attached to the lower end of a panel board. FIG. [Figure 3] 1 is a diagram showing a fixing bracket according to a first embodiment of the present invention as viewed from above. FIG. [Figure 4] FIG. 10 is a perspective view showing a state in which a fastening member according to a second embodiment of the present invention is attached to the lower end of a panel board. DETAILED DESCRIPTION OF THE INVENTION

[0013] The fastener of the present invention will be described in detail below with reference to the accompanying drawings.

[0014] 1 is a perspective view showing a part of a formwork constructed using fixing brackets according to a first embodiment of the present invention. The formwork is used in concrete pouring work, which is one step in the construction of a reinforced concrete or steel-reinforced concrete building. In this embodiment, formwork work for forming the foundation of a concrete skeleton will be described as an example.

[0015] The formwork is placed on concrete (so-called concrete floor slab 100) cast on the ground where concrete pouring work will be performed. The formwork is composed of an array of multiple panel plates 200, with a filling space for ready-mixed concrete formed between the opposing panel plates 200. Figure 1 shows the lower end of the panel plate 200 as viewed from the outside. A fixing bracket 300 according to the first embodiment of the present invention is attached to the lower end of the panel plate 200. Although not shown in the figure, during actual construction, opposing panel plates 200 are arranged at a predetermined distance from each other, and these panel plates 200 are connected at the predetermined distance by separators. The spacing between opposing panel plates 200 determines the thickness of the concrete to be cast and can be adjusted appropriately depending on the concrete structure to be cast. Furthermore, a stud is provided on the outer edge of each panel plate 200 to position the panel plate 200.

[0016] When the formwork is assembled on the concrete floor slab 100, a filling space that follows the shape of the concrete to be formed is formed between the opposing panel plates 200. The filler poured into the filling space is not limited to concrete, and can be any hardening filler that hardens over time, such as mortar.

[0017] The panel board 200 is erected on a concrete floor board 100, which is a fixed surface. The panel board 200 has a flat panel body 210, a frame plate portion 220 perpendicular to the panel body 210, and a rib portion 230 formed continuously with the frame plate portion 220. The panel body 210 constitutes the filling space and is the portion that comes into contact with the concrete poured into the filling space. Therefore, when the formwork is assembled, the panel body 210 is arranged in parallel with the panel body 210 of an adjacent panel board 200.

[0018] The frame plate portion 220 is formed continuously with the panel body 210 and is provided at the lower end of the panel body 210. The frame plate portion 220 is arranged so as to be parallel to the concrete floor slab 100 when the panel plate 200 is set upright on the concrete floor slab 100, and is in surface contact with the concrete floor slab 100. Therefore, the frame plate portion 220 can support the panel plate 200 in an upright state on the concrete floor slab 100.

[0019] The rib portion 230 is provided perpendicular to the frame plate portion 220. That is, the rib portion 230 is formed parallel to the panel main body 210, and the rib portion 230 and the panel main body 210 face each other with the frame plate portion 220 in between. As a result, a recess is formed in the lower end of the panel plate 200. The upper end of the panel plate 200 is configured in the same way, but detailed description of the frame plate portion 220 and rib portion 203 formed at the upper end of the panel plate 200 will be omitted.

[0020] The fixing bracket 300 is provided on the lower end of each panel board 200 arranged on the concrete floor slab 100. The fixing bracket 300 has a regulating member 400 that is fixed to the concrete floor slab 100, and a pressing member 500 that is used in combination with the regulating member 400. The fixing bracket 300 shown in Figure 1 shows the regulating member 400 and the pressing member 500 in a separated state, while the fixing bracket 300 shown in Figure 2 shows the regulating member 400 and the pressing member 500 in a combined state.

[0021] The regulating member 400 has a base portion 410 provided on the concrete slab 100 and an engaging portion 420 formed continuously with the base portion 410. The base portion 410 is positioned relative to the concrete slab 100, which serves as a fixed surface. The base portion 410 has a screw hole 411 and a notch 412. As shown in FIG. 2, a screw 313 is inserted into the screw hole 411 to secure the regulating member 400 to the concrete slab 100. The inner diameter of the screw hole 411 is larger than the threaded portion of the screw 313 but smaller than the head of the screw 313. The screw hole 411 is a loose hole, facilitating the installation of the screw 313. The notch 412 functions as a guide when aligning with a marking line (not shown) on the concrete slab 100. This allows the panel board 200 to be placed at a predetermined position on the concrete floor board 100 using the placement position of the fixing metal fittings 300 as a reference.

[0022] The engaging portion 420 guides a pressing member 500 (described later) toward the lower end of the panel plate 200 and abuts against a rib portion 230 of the panel plate 200 to regulate the position of the panel plate 200 on the concrete floor slab 100. The engaging portion 420 is formed upright from the base portion 310. Therefore, the regulating member 400 is formed to be approximately L-shaped in cross section. The height of the engaging portion 420 is set to be higher than the height of the rib portion 230. As shown in FIG. 3, the engaging portion 420 has a straight portion 421 that rises parallel to the rib portion 230, and has bent portions 422 at both ends. A pair of tapered portions 423 are provided that extend tapered at a predetermined angle from the bent portion 422. In other words, the engaging portion 420 is formed in an approximately U-shape that is open toward the bottom of the paper in FIG. 3 and has a concave cross section. In the following description, the inside of the concave cross section may be referred to as the inside of the engaging portion 420, and the outside of the concave cross section may be referred to as the outside of the engaging portion 420. The angle of the bent portion 422 can be set arbitrarily.

[0023] The restricting member 400 is provided so that a part of the outer surface of the straight portion 421 of the engaging portion 420 abuts against the rib portion 230. In other words, when the fixing metal fitting 300 is attached to the lower end of the panel board 200, the base portion 410 abuts against the fixing surface 100, while the engaging portion 420 abuts against the rib portion 230.

[0024] The holding member 500 is a member that is generally L-shaped in cross section and can be combined with the restricting member 400. It has a connecting portion 510 and an abutting portion 520 formed by bending the connecting portion 510 continuously. The connecting portion 510 is engaged with the engaging portion 420 and has a slit 511 and an insertion hole 512. The slit 511 is positioned so that it vertically overlaps the screw hole 411 when the holding member 500 is combined with the restricting member 400. This allows the screws 313 to be easily removed from the concrete floor slab 100, and the fixing bracket 300 can be removed from the concrete floor slab 100 without removing the holding member 500 from the restricting member 400. This facilitates dismantling of the formwork.

[0025] The engaging portion 420 passes through the insertion hole 512 when the pressing member 500 is combined with the regulating member 400. Therefore, the shape of the insertion hole 512 changes depending on the shape of the engaging portion 420, and the insertion hole 512 in this embodiment is slightly larger than the engaging portion 420 and is formed in a tapered shape bent in two places. Figure 3 is a view showing the fixing metal fitting 300 in the state of Figure 2 as viewed from above, and a gap 430 is provided between the tip of the tapered portion 423 and the insertion hole 512 to allow the pressing member 500 to tilt with respect to the engaging portion 420.

[0026] When the engaging portion 420 is inserted into the insertion hole 512, the pressing member 500 descends along the engaging portion 420 and is guided toward the lower end of the panel board 200. The insertion hole 512 is set slightly larger than the engaging portion 420, and the gap 430 is provided, so that the pressing member 500 can move slightly with the engaging portion 420 inserted into the insertion hole 512. As shown in FIG. 2, the pressing member 500 is slightly inclined when it is close to the rib portion 230, and the insertion hole 512 of the pressing member 500 is also inclined. The angle of inclination of the pressing member 500 with respect to the engaging portion 420 is determined by the size of the gap 430.

[0027] As shown in FIG. 3 , the insertion hole 512 is tilted when the engaging portion 420 is inserted, so that a portion of the engaging portion 420 contacts the inner edge of the insertion hole 512. More specifically, the insertion hole 512 is tilted from the panel plate 200 toward the regulating member 400, and the insertion hole 512 and the engaging portion 420 abut at an angle along the outer edge of the engaging portion 420. In particular, at contact portion A between the inner side of the linear portion 421 of the engaging portion 420 and the insertion hole 512, and at contact portion B between the outer side of the linear portion 421 and the insertion hole 512, the engaging portion 420 and the edge of the insertion hole 512 are in line contact over a wide area. This allows the pressing member 500 to be locked to the regulating member 400. Therefore, the fixing bracket 300 can fix the pressing member 500 at any position of the engaging portion 420.

[0028] In this embodiment, the engaging portion 420 and the insertion hole 512 are formed in a concave shape having a tapered portion, but this shape is not intended to be limiting. As in the second embodiment shown in Fig. 4, the engaging portion 420 may be formed only by the straight portion, and the insertion hole 512 may be formed to match the shape of this engaging portion 420. In this case, each long side of the straight portion is in line contact with the edge of the insertion hole 512. In this way, it is sufficient that the engaging portion 420 and the insertion hole 512 are in line contact at least at two points.

[0029] When the pressing member 500 is combined with the regulating member 400, the abutting portion 520 abuts against the frame plate portion 220 from the inside of a recess formed in the lower end of the panel plate 200. In other words, when the pressing member 500 and the regulating member 400 are combined, the abutting portion 520 protrudes upward from the frame plate portion 220. This allows the abutting portion 520 to come into contact with the lower end of the panel plate 200 from above. Note that, although the abutting portion 520 abuts against the frame plate portion 220 in this embodiment, it may also abut against the rib portion 230 and come into contact with the lower end of the panel plate 200 from above.

[0030] When the formwork is assembled and the fill space is filled with ready-mixed concrete, lateral pressure of the ready-mixed concrete acts on the panel board 200. As a result, a force that lifts the lower end of the panel board 200 diagonally upward acts on the abutting portion 520 that is in contact with the frame board portion 220. When the lifting force acts on the abutting portion 520, an upward force acts on the holding member 500, generating frictional resistance at the contact points between the insertion hole 512 and the engaging portion 420. In particular, the engaging portion 420 and the insertion hole 512 strongly contact each other at a contact portion C between the vicinity of the bent portion 422 of the engaging portion 420 and the insertion hole 512, and at a contact portion D between the inside of the pair of tapered portions 423 and the insertion hole 512, generating frictional resistance. This frictional resistance restricts the movement of the holding member 500 relative to the restricting member 400, preventing the lower end of the panel board 200 from lifting up. In order to increase the frictional force between the insertion hole 512 and the engaging portion 420, the edge of the insertion hole 512 or the outer edge of the engaging portion 420 may be formed with unevenness to prevent slipping.

[0031] Furthermore, the insertion hole 512 is inclined from the panel plate 200 toward the regulating member 400, while the abutment portion 520 formed continuously with the connecting portion 510 is in contact with the frame plate portion 220, so that a force acts on the pressing member 500 to rotate in the same direction as the inclination direction of the insertion hole 512. Therefore, the engaging portion 420 is sandwiched in the insertion hole 512. This also contributes to preventing the lower end of the panel plate 200 from lifting up.

[0032] As explained above, the fixing bracket 300 is composed of easy-to-process features of the invention, such as a restricting member having a base portion 410 and engaging portion 420 that restricts its position relative to the fixing surface, and a presser member 500 having an insertion hole 512 into which the engaging portion 420 engages and an abutment portion 520 that contacts the frame plate portion 220, and therefore can be manufactured without requiring complex processing. Furthermore, the fixing bracket 300 can prevent the bottom end of the panel board 200 from lifting up simply by combining these components. Therefore, the fixing bracket 300 can be manufactured at low cost and can prevent the bottom end of the panel board 200 from lifting up.

[0033] Furthermore, conventional methods require the lower end of the panel plate to be actively pressed against the fixing surface using concrete pins or the like, which can cause problems such as tilting of the panel plate itself, making it difficult to erect the panel plate. In this regard, the fixing bracket 300 does not actively press the lower end of the panel plate 200 against the fixing surface, but rather prevents the lower end of the panel plate 200 from lifting up by using a pressing member 500 fixed at any position of the engaging portion 420. Therefore, the fixing bracket 300 makes it easy to erect the panel plate 200 without causing problems such as tilting of the panel plate 200 itself.

[0034] Furthermore, the fixing bracket 300 is composed of a restricting member 400 with an engaging portion 420 that abuts against the rib portion 230 and a retaining member 500 that descends along the engaging portion 420 and abuts against the lower end of the panel board 200, which are separate components. The retaining member 500 can be fixed at any position on the engaging portion 420. Therefore, the fixing bracket 300 can prevent the lower end of the panel board 200 from lifting up even if the fixing surface is uneven. While the fixing bracket 300 has been described as preventing the lifting of a panel board 200 used in a formwork, it can be widely applied to any panel board 200 that is placed on a fixed surface, such as preventing the lifting of a panel board 200 placed parallel to the fixed surface. The position where the fixing bracket 300 is installed can be changed as needed depending on the shape and arrangement of the panel board 200. [Explanation of symbols]

[0035] 100... concrete floor slab, 200... panel board, 210... panel body, 220... frame board portion, 230... rib portion, 300... fixing metal fitting, 400... restricting member, 410... base portion, 421... straight portion, 422... bent portion, 423... tapered portion, 500... pressing member, 510... connecting portion, 512... insertion hole, 520... abutting portion

Claims

1. A fixing bracket that prevents a panel board from floating up when placed on a fixing surface, The fixing bracket is the restricting member having a base portion that is fixed in contact with the fixing surface and an engaging portion that is formed upright from the base portion and that restricts the position of the panel board on the fixing surface; a pressing member that has an insertion hole through which the engaging portion of the regulating member passes, is combined with the regulating member, and that protrudes upward from a part of the panel plate; Equipped with When the pressing member is combined with the regulating member, the edge of the insertion hole abuts against the outer edge of the engaging portion, thereby engaging with the regulating member, and abuts against a portion of the panel board, preventing the panel board from lifting up from the fixing surface.

2. The lower end of the panel plate is provided with a frame plate portion that is formed continuously with the flat panel body and perpendicular to the panel body, and a rib portion that is formed continuously with the frame plate portion and parallel to the panel body and forms a recess in the lower part of the panel body, 2. The fixing bracket according to claim 1, wherein the pressing member protrudes upward from the frame plate portion and abuts against the rib portion or the frame plate portion to prevent the panel plate from floating up from the fixing surface.

3. 3. The fastening fixture according to claim 1, wherein the edge of the insertion hole and the outer edge of the engaging portion are in line contact with each other.

4. 3. The fixing bracket according to claim 1, wherein the engaging portion has a concave cross section formed by a straight portion extending from the base portion and a pair of tapered portions extending from the base portion and inclined at a predetermined angle from both ends of the straight portion, while the insertion hole is formed in a concave shape corresponding to the shape of the concave cross section.

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