JP7602452B2 - Fixing structure for hollow resin molded products - Google Patents

Description

This invention relates to a fixing structure for hollow resin molded products used to construct floor structures for buildings, structures, and various other facilities.

Hollow resin molded products are sometimes used to construct floor structures for buildings, structures, and various other facilities. Hollow resin molded products generally have multiple longitudinal hollow sections with openings at both ends, arranged in parallel in a direction perpendicular to the longitudinal direction (hereafter referred to as the width direction). The use of hollow resin molded products can reduce the weight of components.

For example, in Patent Document 1, a hollow resin molded product is placed on a supporting structure (beam material) and secured to the structure by bolts and nuts that pass through both. In Patent Document 2, caps are inserted into the ends of the hollow resin molded product to reinforce the component.

JP 2005-325610 A JP 2014-152569 A

Conventional hollow resin molded products had the problem of inefficient methods of fixing them to the supporting structure. Also, when fixing structures were used with bolts and nuts, there was a problem that the resin molded products would deform and fall off the supporting structure if a large load that exceeded expectations was applied.

In Patent Document 1, the sides of adjacent hollow resin molded products that are rectangular in plan view are fastened together with bolts at the four corners to efficiently fix the products to the frame. However, as the number of bolts to be fastened increases, the work becomes more complicated and the time required for construction increases. In addition, no measures are taken to withstand larger loads.

In Patent Document 2, a cap is attached to the opening at the end of the hollow resin molded product, allowing it to withstand a large load. However, in Patent Document 2, it is necessary to provide a separate means for fixing both longitudinal ends of the hollow resin molded product to the support. In other words, it is necessary to provide some kind of fixing means in addition to the cap, which leads to problems of a complicated structure, an increased amount of work, and increased costs.

Therefore, the objective of this invention is to provide a fixing structure for hollow resin molded products that is simple in structure, easy to install, and can withstand larger loads.

In order to solve the above problems, the present invention employs a fixing structure for a hollow resin molded product, which includes a resin molded product having opposing top and bottom plates and a wall portion connecting the top and bottom plates, in which a longitudinal hollow space having openings at both ends is formed by the top plate, the bottom plate and the wall portion, a reinforcing member inserted into the hollow space and having a top portion facing the inner surface of the top plate, a bottom portion facing the inner surface of the bottom plate and a connecting portion connecting the top portion and the bottom portion, and a locking means penetrating the bottom portion and the bottom plate, and which fixes the resin molded product to a supporting member that supports it using the reinforcing member and the locking means.

Here, the reinforcing member may be configured to have a gripping portion on the connecting portion that faces the opening side of the hollow space.

The reinforcing member may have a female threaded portion at the bottom, and the locking means may be a bolt that is screwed into the female threaded portion from the support member side.

The female threaded portion is a nut welded to the bottom, and the connecting portion or the top portion, or both, may have an opening facing the nut.

In order to solve the above problems, the present invention provides a reinforcing member for use in fixing a resin molded product having opposing top and bottom plates and a wall portion connecting the top and bottom plates, in which a longitudinal hollow space with openings at both ends is formed by the top plate, the bottom plate and the wall portion, to a support member that supports the resin molded product, the reinforcing member being inserted into the hollow space and having a top portion facing the inner surface of the top plate, a bottom portion facing the inner surface of the bottom plate, and a connecting portion connecting the top portion and the bottom portion, the bottom portion having a hole through which a locking means that penetrates the bottom plate is inserted.

This invention allows for a fixing structure for hollow resin molded products that is simple in structure and easier to install, and can also support larger loads.

FIG. 1 is a perspective view showing a first embodiment of the present invention; FIG. 1 is a perspective view of a reinforcing member used in the first embodiment; 1A is a plan view of a reinforcing member used in a first embodiment, FIG. 1B is a left side view, FIG. 1C is a front view, FIG. 1D is a right side view, FIG. 1E is a rear view, and FIG. 1F is a bottom view. FIG. 1 is a longitudinal sectional view of a first embodiment. Cross-sectional view of the first embodiment FIG. 1 is an exploded perspective view showing an enlarged main part of a first embodiment; FIG. 1 is a perspective view showing a second embodiment of the present invention; FIG. 13 is a perspective view of a reinforcing member used in the second embodiment; 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I, 10J, 10J, 10K ... FIG. 11 is an enlarged cross-sectional view of a main part of the second embodiment. FIG. 11 is an enlarged longitudinal sectional view of a main portion of the second embodiment; FIG. 13 is an exploded perspective view showing an enlarged main part of the second embodiment; 1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a right side view showing a modified example of the reinforcing member. 1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a right side view showing a modified example of the reinforcing member.

Embodiments of the present invention will be described with reference to the drawings. Figures 1 to 6 show a first embodiment, and Figures 7 to 12 show a second embodiment. Also, Figures 13 and 14 show modified examples.

(First embodiment)
The hollow resin molded product 10 of the embodiment (hereinafter referred to as the resin molded product 10) is a flat rectangular parallelepiped member that is rectangular in plan view. It has a plurality of longitudinal hollow portions with openings at both ends arranged in parallel in a direction perpendicular to the longitudinal direction (hereinafter referred to as the width direction). The basic configuration of the resin molded product 10 is the same in the embodiments described below.

The resin molded product 10 is made of GFRP (glass fiber reinforced plastic). The resin molded product 10 has opposing top and bottom plates 11 and 14, and walls 12 and 13 connecting the top and bottom plates 11 and 14. Of the walls 12 and 13, the walls 12 located at both ends in the width direction are hereinafter referred to as side walls 12. The walls 13 located at other than both ends in the width direction are hereinafter referred to as middle walls 13. The longitudinal space surrounded by the top plate 11, bottom plate 14, and side walls 12 or middle walls 13 is a hollow space with openings at both ends in the longitudinal direction. In other words, the resin molded product 10 has hollow spaces (lightening holes) that open at both ends in the longitudinal direction in parallel in the width direction, and the space between adjacent hollow spaces in the width direction is a web (middle wall 13) connecting the top plate 11 and the bottom plate 14. The side wall portion 12 and the middle wall portion 13 are provided continuously over the entire longitudinal length.

In addition, by laminating a sheet-like reinforcing material made of CFRP (carbon fiber reinforced plastic) or the like to the back surface (outer surface) of the bottom plate 14, the elastic modulus of the bottom plate 14, which is the tensile side against the load from the top plate 11 side, can be improved, and the tensile strength can be increased. Also, a non-slip layer can be laminated to the front surface (outer surface) of the top plate 11 for the purpose of preventing slipping.

The resin molded product 10 is used by being stretched across support members 1, 1 to construct floor structures for buildings, structures, and various other facilities. In this embodiment, the support member 1 is assumed to be a beam made of steel material with an I-shaped cross section. The beam is composed of an upper flange 2, a lower flange, and a web connecting the upper flange 2 and the lower flange. With the resin molded product 10 laid between the support members 1, 1, vehicles, people, etc. pass over the resin molded product 10.

When fixing the resin molded product 10 to the support member 1, a reinforcing member 20 and a locking means are used.

The reinforcing member 20 is inserted into both ends of the hollow space. As shown in Figures 2 and 3, the reinforcing member 20 is composed of a member having a rectangular cross section, including a top 23 facing the inner surface of the top plate 11 of the resin molded product 10, a bottom 21 facing the inner surface of the bottom plate 14, and a pair of connecting parts 22, 24 connecting the top 23 and the bottom 21. As shown in Figures 4, 5, and 6, the pair of connecting parts 22, 24 consists of a connecting part 22 (hereinafter referred to as a first connecting part 22) facing the opposite side to the opening side of the hollow space, and a connecting part 24 (hereinafter referred to as a second connecting part 24) facing the opening side of the hollow space. The reinforcing member 20 is formed by bending two plate-shaped metal members, with the top 23 and the first connecting portion 22, and the bottom 21 and the second connecting portion 24, and the edge of the top 23 and the edge of the second connecting portion 24, and the edge of the bottom 21 and the edge of the first connecting portion 22, respectively, being connected by welding (see Figs. 3(b) and 3(d)). As a result, the reinforcing member 20 is formed in a cylindrical shape with openings A and B (see Fig. 2) on both sides in the axial direction of the cylinder. The openings A and B are arranged to face the side wall portion 12 or the middle wall portion 13. By not facing the openings A and B toward the opening side of the hollow space, it is possible to prevent the intrusion of foreign objects into the hollow space (including the intrusion of birds and other living things and the building of nests inside).

In this embodiment, a grip 31 is provided on the second connecting portion 24 facing the opening side of the hollow space. The grip 31 is for an operator to manually move the reinforcing member 20 when adjusting the position of the reinforcing member 20. In this embodiment, the grip 31 is a notch provided on both edges (the edges on the open portions A and B sides) of the second connecting portion 24. The edges of the notch are arc-shaped, and are shaped to easily hook the operator's fingers.

The reinforcing member 20 has a female thread in the center of the bottom 21. In addition, a bolt 4 that is screwed into the female thread from the support member 1 side is used as a locking means used to fix the resin molded product 10 to the support member 1. In this embodiment, the female thread is composed of a nut 25 welded and fixed to the bottom 21. The nut 25 is fixed to the position of a hole 26 provided in the center of the bottom 21. The nut 25 can be easily welded and fixed to the bottom 21 by inserting a welding rod from the outside through the opening A or B. Note that if the thickness of the bottom 21 member is secured to a certain extent, the female thread may be formed directly in the hole 26 provided in the bottom 21.

An example of a method for fixing the resin molded product 10 to the support member 1 using this reinforcing member 20 and locking means is described below.

First, reinforcing members 20 are inserted into the hollow spaces at both longitudinal ends of the resin molded product 10. In order to further increase the strength, it is desirable to insert reinforcing members 20 into all of the hollow spaces and at both ends of the hollow spaces. The reinforcing members 20 inserted into the hollow spaces have their top 23 facing the inner surface of the top plate 11 and their bottom 21 facing the inner surface of the bottom plate 14. Although it is not excluded that there may be a gap between the surface of the top 23 and the inner surface of the top plate 11, it is desirable that the top 23 abut against the inner surface of the top plate 11, the bottom 21 abut against the bottom plate 14, and the first connecting portion 22 and the second connecting portion 24 brace themselves between the top plate 11 and the bottom plate 14, which is advantageous in terms of increasing strength.

The upper flange 2 of the support member 1 has a through hole 3 (see Figure 6). A bolt 4 is inserted from the bottom to the top of the upper flange 2. The jaw portion of the head of the bolt 4 abuts the underside of the upper flange 2 (see Figures 4 and 5). The bolt 4 passes through the through hole 3 of the upper flange 2, the through hole 15 of the bottom plate 14, and the hole 26 of the bottom 21, and is then screwed into the female thread formed by the nut 25. This tightens and fixes the support member 1, the resin molded product 10, and the reinforcing member 20.

When a vehicle or person passes over the resin molded product 10 in this installed state, a load acts from both longitudinal ends of the resin molded product 10 toward the support member 1. Here, both longitudinal ends of the resin molded product 10 are locally reinforced by the reinforcing member 20, so sufficient load resistance can be exhibited. In particular, since the bolt 4 penetrates the resin molded product 10 and the reinforcing member 20, high strength can be expected for the fixed portion (both longitudinal ends of the resin molded product 10). In addition, since the reinforcing member 20 also functions as part of the locking means for the support member 1 together with the aforementioned bolt 4, the reinforcing member 20 can simultaneously perform two functions: reinforcing the resin molded product 10 and fixing the resin molded product 10. This can be expected to simplify the structure, reduce the amount of work, and reduce costs.

Second Embodiment
The second embodiment of the present invention will be described with reference to Figures 7 to 12. Since the main configurations of the resin molded product 10 and the support member 1 are similar, the following description will focus on the reinforcing member 20, which is the difference between the two.

In this embodiment, the reinforcing member 20 is a member having a rectangular cross section, including a top 23 facing the inner surface of the top plate 11 of the resin molded product 10, a bottom 21 facing the inner surface of the bottom plate 14, and a pair of connecting parts 22, 24 connecting the top 23 and the bottom 21. As shown in Figures 7, 8 and 9, the shape is slightly flatter than that of the first embodiment, and matches the shape of the hollow space of the resin molded product 10. The pair of connecting parts 22, 24 consists of a second connecting part 24 facing the opposite side to the opening side of the hollow space, and a first connecting part 22 facing the opening side of the hollow space (see Figures 10 and 11). The reinforcing member 20 is formed by cutting a longitudinal cylindrical member (square pipe) at predetermined lengths along its longitudinal direction, and then cutting and removing a part of the top 23 and a part of the second connecting part 24 to form an opening 32. As a result, the reinforcing member 20 is a cylindrical member with open sections A and B (see FIG. 8) on both sides in the axial direction of the cylinder. Open sections A and B are similarly arranged to face the side wall section 12 or the middle wall section 13. The reinforcing member 20 is also similarly provided with a female thread section in the center of the bottom section 21.

The second connecting portion 24 and the top portion 23 are provided with an opening 32 facing the nut 25. By inserting a welding rod into the inside through the opening 32, the nut 25 can be easily welded to the bottom portion 21. When the openings A and B are small, it is effective to provide such an opening 32. As shown in FIG. 8, the opening 32 in this embodiment is composed of a lower edge 32a that coincides with the ridge line between the bottom portion 21 and the second connecting portion 24, linear side edges 32b, 32b extending parallel to the direction connecting the bottom portion 21 and the top portion 23, linear upper edges 32c, 32c continuing from the side edges 32b, 32b and extending parallel from the second connecting portion 24 to the first connecting portion 22 side, and an arc-shaped (semicircular) edge 32d connecting the ends of the upper edges 32c, 32c. Since the upper portion of the nut 25 is opened widely while maintaining a cylindrical shape, it is convenient to weld the nut 25 while ensuring the strength of the reinforcing member 20. The opening 32 may be provided in at least one of the second connecting portion 24, the apex 23, and the first connecting portion 22. The opening 32 may be provided across multiple portions selected from the second connecting portion 24, the apex 23, and the first connecting portion 22.

Here, a gripping portion 31 may be provided on the first connecting portion 22 facing the opening side of the hollow space. The gripping portion 31 is for adjusting the position of the reinforcing member 20, as in the above-mentioned embodiment, and may be, for example, a notch provided on both edges (edges on the opening portions A and B sides) of the first connecting portion 22. It is preferable that the second connecting portion 24 having the opening portion 32 faces the opposite side to the opening side of the hollow space (see Figs. 7 and 12). By not facing the opening portions A and B to the opening side of the hollow space and not facing the opening portion 32 to the opening side of the hollow space, it is possible to prevent the intrusion of foreign objects (including the intrusion of birds and other living creatures and the building of nests inside), as in the above-mentioned embodiment. However, if a certain strength is ensured and there is no risk of intrusion of foreign objects, this may be reversed and the second connecting portion 24 having the opening portion 32 may be directed to the opening side of the hollow space. When the second connecting part 24 with the opening 32 faces the opening side of the hollow space, the opening 32 can also serve as the grip part 31.

The method for fixing the resin molded product 10 to the support member 1 using this reinforcing member 20 and locking means is the same as in the first embodiment, so its description will be omitted (see Figure 12).

Figure 13 shows a modified example of the reinforcing member 20. The reinforcing member 20 in Figure 13 is the reinforcing member 20 of the first embodiment with the first connecting portion 22 omitted. The reinforcing member 20 is a member having a U-shaped cross section formed by bending a single plate-shaped metal member to form a top portion 23, a second connecting portion 24, and a bottom portion 21. Figure 14 shows another modified example of the reinforcing member 20. The reinforcing member 20 in Figure 14 is the reinforcing member 20 of the first embodiment, where the bent portion of the metal member is made into an arc shape. The smooth corners of the members constituting the reinforcing member 20 prevent scratches, etc. from occurring on the resin molded product 10.

In the above embodiment, the locking means is a bolt 4 that is screwed into the female thread from the support member 1 side and then screwed into the female thread on the reinforcing member 20 side. However, the locking means may be anything that penetrates the bottom 21 of the reinforcing member 20 and the bottom plate 14 of the resin molded product 10, and may be, for example, a screw or a pin other than the bolt 4.

When screws or pins are used as the fastening means, the screws or pins may be screwed and driven from the support member 1 side into the resin molded product 10 and the reinforcing member 20 side, as in the case of the bolt 4, or conversely, may be screwed and driven from the reinforcing member 20 side into the resin molded product 10 and the support member 1 side. The bolt 4 shown in the embodiment may also be screwed from the reinforcing member 20 side into the resin molded product 10 and the support member 1 side. In this case, it is preferable to provide a receiving portion corresponding to the bolt 4, screw, pin, etc. on the support member 1 side. For example, for the bolt 4 or screw, the receiving portion can be a female thread member screwed and driven into the body of the support member 1, and for the pin, if the support member 1 is made of wood, resin, or other material, the material itself, such as wood or resin, can be used as the receiving portion, and if the support member 1 is made of metal, a material into which the tip of the pin can penetrate can be embedded into the corresponding part of the support member 1 to form the receiving portion.

In each of the above embodiments, a notch provided on the edge of the first connecting part 22 or the second connecting part 24 is used as the grip part 31, but the position and shape of the grip part 31 are not limited to these embodiments. For example, a hole large enough for an operator to insert a finger may be provided in a portion other than the edge of the first connecting part 22 or the second connecting part 24, and the hole may serve as the grip part 31. Also, for example, a protrusion that an operator can grasp with his or her finger may be provided on the first connecting part 22 or the second connecting part 24, and the protrusion may serve as the grip part 31.

In each of the above embodiments, the resin molded product 10 is a flat rectangular member that forms a rectangle in a plan view, but this shape in a plan view can be changed as appropriate. For example, the resin molded product 10 may be a parallelogram in a plan view. The material of the resin molded product 10 is not limited to GFRP (glass fiber reinforced plastic), and various resin materials having a predetermined strength can be used. Furthermore, the hollow space inside the resin molded product 10 is not limited to a square or rectangular cross-sectional shape as in each embodiment, and may be another cross-sectional shape. Furthermore, the material of the reinforcing member 20 is not limited to metal as in this embodiment, and may be another material such as resin as long as it has the predetermined strength and durability.

1 Support member 4 Bolt 10 Resin molded product (hollow resin molded product)
11 Top plate 12 Wall part (side wall part)
13 Wall portion (middle wall portion)
14 Bottom plate 20 Reinforcement member 21 Bottom part 22 Connecting part (first connecting part)
23 Top 24 Connecting part (second connecting part)
25 Nut 26 Hole 31 Grip portion 32 Opening

Claims (5)

a resin molded product (10) comprising a top plate (11) and a bottom plate (14) facing each other, a pair of side walls (12, 12) connecting the top plate (11) and the bottom plate (14), and a middle wall (13) connecting the top plate (11) and the bottom plate (14) between the pair of side walls (12, 12), in which a plurality of longitudinal hollow spaces having openings at both ends are formed in parallel by the top plate (11), the bottom plate (14), the side walls (12), and the middle wall (13), or by the top plate (11), the bottom plate (14), and the adjacent middle wall portions (13, 13) ;
a reinforcing member (20) formed in a cylindrical shape with a square cross section, the reinforcing member (20) being inserted into the hollow space and including a top portion (23) facing the inner surface of the top plate (11), a bottom portion (21) facing the inner surface of the bottom plate (14), and a pair of connecting portions connecting the top portion (23) and the bottom portion (21);
a locking means passing through the bottom (21) and the bottom plate (14);
Equipped with
The reinforcing members (20) are inserted into the openings of the hollow spaces, respectively, and are fixed to the resin molded product (10) and the support member (1) that supports it by the locking means, thus forming a fixing structure for a hollow resin molded product. 2. The fixing structure for a hollow resin molded product according to claim 1, wherein the pair of connecting portions comprises a first connecting portion (22) and a second connecting portion (24), the second connecting portion (24) is provided with a gripping portion (31), and when the reinforcing member (20) is inserted into an opening of the hollow space, the second connecting portion (24) provided with the gripping portion (31) is positioned closer to the opening than the first connecting portion (22) . The fixing structure for a hollow resin molded product according to claim 1 or 2, wherein the reinforcing member (20) has a female threaded portion on the bottom portion (21), and the locking means is a bolt (4) that is screwed into the female threaded portion from the support member (1) side. The fixing structure for a hollow resin molded product according to claim 3, wherein the female thread is a nut (25) welded to the bottom (21), and the connecting portion (22, 24) or the top (23) or both have an opening (32) facing the nut (25). A reinforcing member (20) used for fixing a resin molded product (10) comprising opposing top and bottom plates (11) and (14), a pair of side walls (12, 12) connecting the top plate (11) and the bottom plate (14), and a middle wall (13) connecting the top plate ( 11) and the bottom plate (14) between the pair of side walls (12, 12), in which a plurality of longitudinal hollow spaces having openings at both ends are formed in parallel by the top plate (11), the bottom plate (14), the side walls (12) and the middle wall (13), or by the top plate (11), the bottom plate (14) and the adjacent middle wall portions (13, 13), to a support member (1) that supports the resin molded product,
The reinforcing member (20) is inserted into each of the plurality of hollow spaces, and is a cylinder with a square cross section, having a top portion (23) facing the inner surface of the top plate (11), a bottom portion (21) facing the inner surface of the bottom plate (14), and a pair of connecting portions connecting the top portion (23) and the bottom portion (21) ;
The bottom portion (21) is provided with a hole (26) through which a fastening means penetrating the bottom plate (14) is inserted, and is a reinforcing member for a hollow resin molded product.

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