Fixing structure for hollow resin molded products

Abstract

To realize a fixing structure of a hollow-shaped resin molded product that has better workability and can handle a larger load.SOLUTION: A fixing structure of a hollow-shaped resin molded product comprises: a resin molded product 10 including a top plate 11 and a bottom plate 14 facing each other, walls 12 and 13 connecting the top plate 11 and the bottom plate 14, and having a longitudinal hollow space with openings at both ends formed by the top plate 11, the bottom plate 14 and the walls 12 and 13; a reinforcement member 20 inserted into the hollow space and having a top portion 23 in contact with an inner surface of the top plate 11, a bottom portion 21 in contact with an inner surface of the bottom plate 14, and connecting portions 22 and 24 connecting the top portion 23 to the bottom portion 21; and engagement means of penetrating through the bottom portion 21 and the bottom plate 14. The resin molded product 10 and a support member 1 that supports the same are fixed by the reinforcement member 20 and the engagement means.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fixing structure for a hollow resin molded product used for constructing floor structures of buildings, structures, and various other facilities. [Background technology]

[0002] 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 parts with openings at both ends, arranged in parallel in a direction perpendicular to the longitudinal direction (hereinafter referred to as the width direction). By using hollow resin molded products, it is possible to reduce the weight of the components.

[0003] For example, in Patent Document 1, a hollow resin molded product is placed on a supporting structure (beam material) and fixed to the structure by fastening with bolts and nuts that penetrate both. In Patent Document 2, caps are inserted into the ends of the hollow resin molded product to reinforce the member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2005-325610 A [Patent Document 2] JP 2014-152569 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional hollow resin molded products have problems with the inefficient method of fixing them to the supporting structure. In addition, when a large load beyond the expected limit is applied to the fixing structure by tightening bolts and nuts, the resin molded product can deform and fall off the supporting structure.

[0006] 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 building frame. However, there is a problem that the work becomes complicated and the time required for construction increases as the number of bolts to be fastened increases. In addition, no measures are taken to withstand larger loads.

[0007] In Patent Document 2, a cap is attached to the opening at the end of the hollow resin molded product to enable it to withstand a large load. However, in Patent Document 2, it is necessary to provide a 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.

[0008] SUMMARY OF THE PRESENTING EMBODIMENT An object of the present invention is to provide a fixing structure for a hollow resin molded product which is simple in structure, easy to install, and capable of supporting a larger load. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention adopts a fixing structure for a hollow-shaped resin molded product comprising: a resin molded product having opposing top and bottom plates and a wall portion connecting the top plate and the bottom plate, wherein 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, wherein the reinforcing member and the locking means fix the resin molded product to a support member that supports it.

[0010] Here, the reinforcing member may have a grip portion on the connecting portion facing the opening side of the hollow space.

[0011] 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.

[0012] The female threaded portion may be a nut welded to the bottom portion, and the connecting portion or the top portion, or both, may have an opening facing the nut.

[0013] In addition, in order to solve the above-mentioned problems, the present invention provides a reinforcing member used to fix a resin molded product having opposing top and bottom plates and a wall portion connecting the top and bottom plates, and in which a longitudinal hollow space having 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, wherein the reinforcing member is inserted into the hollow space and has 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 the bottom portion has a hole through which a locking means that penetrates the bottom plate is inserted. Effect of the Invention

[0014] The present invention provides a fixing structure for a hollow resin molded product that is simple in structure and easy to install, and can also support a larger load. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing a first embodiment of the present invention; [Diagram 2] FIG. 1 is a perspective view of a reinforcing member used in a first embodiment; [Diagram 3] 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. [Figure 4] FIG. 1 is a longitudinal sectional view of a first embodiment. [Diagram 5] Cross-sectional view of the first embodiment [Figure 6]FIG. 1 is an exploded perspective view showing an enlarged main part of a first embodiment; [Figure 7] FIG. 1 is a perspective view showing a second embodiment of the present invention; [Figure 8] FIG. 13 is a perspective view of a reinforcing member used in the second embodiment; [Figure 9] 1A, 1B, 1C, 1D, 1E, 1F, and 1G are diagrams showing a reinforcing member used in a second embodiment, in which (a) is a plan view, (b) is a left side view, (c) is a front view, (d) is a right side view, (e) is a rear view, and (f) is a bottom view. [Figure 10] FIG. 11 is an enlarged cross-sectional view of a main part of the second embodiment. [Figure 11] FIG. 11 is an enlarged longitudinal sectional view of a main part of the second embodiment. [Figure 12] FIG. 13 is an exploded perspective view showing an enlarged main part of the second embodiment; [Figure 13] 1A is a plan view of a modified example of the reinforcing member, FIG. 1B is a front view of the reinforcing member, and FIG. [Figure 14] 1A is a plan view of a modified example of the reinforcing member, FIG. 1B is a front view of the reinforcing member, and FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the accompanying drawings. Figures 1 to 6 show a first embodiment, and Figures 7 to 12 show a second embodiment. Also, Figures 13 and 14 show modifications thereof.

[0017] (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 parts 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.

[0018] The resin molded product 10 is made of GFRP (glass fiber reinforced plastic). The resin molded product 10 has a top plate 11 and a bottom plate 14 facing each other, and walls 12, 13 connecting the top plate 11 and the bottom plate 14. Of the walls 12, 13, the wall 12 located at both ends in the width direction is hereinafter referred to as a side wall 12. The wall 13 located at other than both ends in the width direction is hereinafter referred to as a middle wall 13. A longitudinal space surrounded by the top plate 11, the bottom plate 14, and the side wall 12 or the middle wall 13 is a hollow space having openings at both ends in the longitudinal direction. That is, 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 length in the longitudinal direction.

[0019] If a sheet-like reinforcing material made of CFRP (carbon fiber reinforced plastic) or the like is laminated on 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, an anti-slip layer can be laminated on the front surface (outer surface) of the top plate 11 for the purpose of preventing slipping.

[0020] 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 a 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.

[0021] When the resin molded product 10 is fixed to the support member 1, a reinforcing member 20 and a locking means are used.

[0022] 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 portion 23 facing the inner surface of the top plate 11 of the resin molded product 10, a bottom portion 21 facing the inner surface of the bottom plate 14, and a pair of connecting portions 22, 24 connecting the top portion 23 and the bottom portion 21. As shown in Figures 4, 5, and 6, the pair of connecting portions 22, 24 consists of a connecting portion 22 (hereinafter referred to as a first connecting portion 22) facing the side opposite to the opening side of the hollow space, and a connecting portion 24 (hereinafter referred to as a second connecting portion 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 are connected by welding, respectively (see Fig. 3(b) and Fig. 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 to the opening side of the hollow space, there is an effect of preventing the intrusion of foreign objects into the hollow space (including the intrusion of living things such as birds and the building of nests inside).

[0023] In this embodiment, a grip portion 31 is provided on the second connecting portion 24 facing the opening side of the hollow space. The grip portion 31 is used by an operator to manually move the reinforcing member 20 when adjusting the position of the reinforcing member 20. In this embodiment, the grip portions 31 are notches provided on both edges (the edges on the open portions A and B sides) of the second connecting portion 24. The edges of the notches are arc-shaped, and are shaped to easily hook the fingers of an operator.

[0024] The reinforcing member 20 has a female threaded portion at the center of the bottom 21. In addition, as a locking means used to fix the resin molded product 10 to the support member 1, a bolt 4 is used which is screwed into the female threaded portion from the support member 1 side. In this embodiment, the female threaded portion is constituted by a nut 25 welded and fixed to the bottom 21. The nut 25 is fixed in accordance with 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 open portion A or the open portion B. Note that, if the thickness of the member of the bottom 21 is secured to a certain degree or more, the female threaded portion may be formed directly in the hole 26 provided in the bottom 21.

[0025] An example of a method for fixing the resin molded product 10 to the support member 1 using the reinforcing member 20 and the locking means will be described.

[0026] First, the reinforcing members 20 are inserted into the hollow spaces at both ends of the resin molded product 10 in the longitudinal direction. In order to further increase the strength, it is desirable to insert the reinforcing members 20 into all the hollow spaces and at both ends of the hollow spaces. The reinforcing members 20 inserted into the hollow spaces have the top 23 facing the inner surface of the top plate 11 and the bottom 21 facing the inner surface of the bottom plate 14. Although it is not excluded that there is 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 abuts against the inner surface of the top plate 11, the bottom 21 abuts against the bottom plate 14, and the first connecting portion 22 and the second connecting portion 24 are braced between the top plate 11 and the bottom plate 14, which is advantageous in terms of increasing the strength.

[0027] A through hole 3 is provided in the upper flange 2 of the support member 1 (see FIG. 6). A bolt 4 is inserted from below to above the upper flange 2. The jaw portion of the head of the bolt 4 abuts against the underside of the upper flange 2 (see FIGS. 4 and 5). The bolt 4 passes through the through hole 3 in the upper flange 2, through the through hole 15 in the bottom plate 14, and through the hole 26 in the bottom 21, and is then screwed into the female thread portion formed by the nut 25. This tightens and fixes the support member 1, the resin molded product 10, and the reinforcing member 20.

[0028] When a vehicle or a 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 that 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 fixing portion (both longitudinal ends of the resin molded product 10). In addition, since the reinforcing member 20 also serves as part of the function of the locking means to the support member 1 together with the above-mentioned bolt 4, the reinforcing member 20 can simultaneously perform two functions, that is, 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.

[0029] 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 them.

[0030] In this embodiment, the reinforcing member 20 is also configured as a member having a rectangular cross section, including a top portion 23 facing the inner surface of the top plate 11 of the resin molded product 10, a bottom portion 21 facing the inner surface of the bottom plate 14, and a pair of connecting portions 22, 24 connecting the top portion 23 and the bottom portion 21. As shown in Figs. 7, 8, and 9, the shape is slightly flatter than that of the first embodiment, and is made to match the shape of the hollow space of the resin molded product 10. The pair of connecting portions 22, 24 consists of a second connecting portion 24 facing the opposite side to the opening side of the hollow space, and a first connecting portion 22 facing the opening side of the hollow space (see Figs. 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 portion 23 and a part of the second connecting portion 24 to form an opening 32. As a result, the reinforcing member 20 is a cylindrical member having open portions A and B (see FIG. 8) on both sides in the axial direction of the cylinder. The open portions A and B are similarly arranged to face the side wall portion 12 or the middle wall portion 13. The reinforcing member 20 is also similarly provided with a female thread portion in the center of the bottom portion 21.

[0031] 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 open portions 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 portion 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 a plurality of portions selected from the second connecting portion 24, the apex 23, and the first connecting portion 22.

[0032] 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 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 portion 24 having the opening 32 faces the opening side of the hollow space, the opening 32 can also serve as the grip portion 31.

[0033] The method of fixing the resin molded product 10 to the support member 1 using the reinforcing member 20 and the locking means is the same as in the first embodiment, and therefore the description thereof will be omitted (see FIG. 12).

[0034] FIG. 13 shows a modified example of the reinforcing member 20. The reinforcing member 20 in FIG. 13 is obtained by omitting the first connecting portion 22 from the reinforcing member 20 of the first embodiment. The reinforcing member 20 is a member having a U-shaped cross section, with a top portion 23, a second connecting portion 24, and a bottom portion 21 formed by bending a single plate-like metal member. FIG. 14 shows another modified example of the reinforcing member 20. The reinforcing member 20 in FIG. 14 is obtained by bending the metal member of the reinforcing member 20 of the first embodiment at a bent portion, which is an arc. The corners of the members constituting the reinforcing member 20 are smooth, which can prevent scratches and the like from occurring on the resin molded product 10.

[0035] In the above embodiment, the locking means is a bolt 4 that is screwed into the female threaded portion from the support member 1 side, and then screwed into the female threaded portion on the reinforcing member 20 side. However, the locking means need only penetrate 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.

[0036] When a screw or a pin is used as the locking means, the screw or pin 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 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, the screw, the pin, etc., on the support member 1 side. For example, for the bolt 4 or the 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 a material such as wood or resin, the material itself such as wood or resin can be used as the receiving portion, and if the support member 1 is made of a metal material, 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.

[0037] In each of the above embodiments, a notch provided on the edge of the first connecting portion 22 or the second connecting portion 24 is used as the grip portion 31, but the position and shape of the grip portion 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 portion 22 or the second connecting portion 24, and the hole may be used as the grip portion 31. In addition, for example, a protrusion that an operator can grasp with his or her finger may be provided on the first connecting portion 22 or the second connecting portion 24, and the protrusion may be used as the grip portion 31.

[0038] In each of the above embodiments, the resin molded product 10 is a flat rectangular parallelepiped 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 adopted. 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 a predetermined strength and durability. [Explanation of symbols]

[0039] 1 Support member 4 Volts 10 Resin molded products (hollow shaped resin molded products) 11 Top plate 12 Wall (side wall) 13 Wall part (middle wall part) 14 Bottom plate 20 Reinforcement members 21 Bottom 22 Connecting part (1st connecting part) 23 Top 24 Connecting part (second connecting part) 25 Nut 26 holes 31 Gripping part 32 Opening

Claims

1. 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. A fixing structure for a hollow-shaped resin molded product as described in 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 the 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).

3. 3. 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 (21), and the locking means is a bolt (4) screwed into the female threaded portion from the support member (1) side.

4. 4. The fixing structure for a hollow resin molded product according to claim 3, wherein the female thread portion is a nut (25) welded and fixed to the bottom portion (21), and the connecting portion (22, 24) or the top portion (23) or both have an opening (32) facing the nut (25).

5. 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, the cylinder 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.

Images