Fall prevention fence

Abstract

To provide a fall prevention fence which does not narrow a road width and which can be attached so as to prevent a strength decrease of a skeleton of an embedded structure.SOLUTION: A fall prevention fence 300 preventing fall into a drain channel 510 of an embedded structure 500 comprises: a sill portion 100 comprising a beam member 110 stretched between side walls 520 at both sides of the embedded structure 500; and a fence portion 200 attached to the sill portion 100 so as to protrude upward from the sill portion 100. The beam member 110 of the sill portion 100 is attached to be engaged with a part of the side wall 520.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fall prevention fence that prevents people, vehicles, etc. from falling into drainage channels in buried structures such as catch basins and gutters installed on roads. [Background technology]

[0002] Conventionally, buried structures equipped with drainage channels such as catch basins and gutters installed on roads have been provided with fall prevention fences to prevent people, vehicles, etc. from falling into the drainage channels. For example, in wide drainage channels, fall prevention fences are provided to protrude upward from the drainage channel so that people, vehicles, etc. can easily recognize the existence of the drainage channel. However, when fall prevention fences are provided on the shoulders of adjacent roads, there is a problem that the road width becomes narrower. On the other hand, when a fall prevention fence is fixed and attached to a buried structure, processing such as drilling mounting holes in the buried structure is performed with tools, which causes a problem that the structure is damaged and the strength of the structure is reduced. DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0003] In view of the above problems, the present invention provides a fall prevention fence that can be installed without narrowing the road width and prevents a decrease in the strength of the buried structure's frame. [Means for solving the problem]

[0004] The fall prevention fence of the present invention is a fall prevention fence that prevents people from falling into a drainage channel of a buried structure, and is characterized in that it comprises a base portion with a beam member that is hung across both side walls of the buried structure, and a fence portion that is attached to the base portion so as to protrude upward from the base portion, and the beam member of the base portion is attached so as to engage with a portion of the side wall.

[0005] According to the above features, the fence portion attached to the base portion protrudes upward from the base portion, so that the fence portion protrudes upward from the road surface and the drainage channel. Therefore, people and vehicles moving from the road surface toward the drainage channel can easily recognize the existence of the drainage channel, and it is possible to prevent falling into the drainage channel. In addition, the fence portion is not directly attached to the side wall of the buried structure or the road surface, but is attached to the base portion attached to the side walls on both sides of the buried structure so as to span the side walls, so that the road width on the road surface side is not narrowed. In addition, when the fall prevention fence is attached to the buried structure, a part of the beam member of the base portion is attached so as to engage with a part of the side wall 520. Therefore, processing such as providing an attachment hole in a part of the side wall is not required, and the structure of the buried structure is not damaged, and a decrease in the strength of the structure can be prevented.

[0006] The fall prevention fence of the present invention is characterized in that the fence portion is removably attached to the base portion.

[0007] According to the above feature, the fence portion can be easily removed from the base portion as required.

[0008] The fall prevention fence of the present invention is characterized in that the fence portion is configured so that it can be changed between a state in which it is attached so that it stands upward from the base portion, and a state in which it is attached so that it is laid down on the base portion and covers a portion of the drainage channel.

[0009] According to the above features, when performing maintenance on the drainage channel or when someone wants to intentionally move to the other side of the drainage channel, the fence section can be stored lying on the base so that it does not get in the way, and the fence section can be used as a foothold for the person performing maintenance or moving.

[0010] The fall prevention fence of the present invention is characterized in that the width of the fence portion is shorter than the width of the drainage channel of the buried structure.

[0011] According to the above features, the fence portion does not need to cover the entire width of the drainage channel, which reduces the cost of the fence portion and makes it lighter, making it easier to handle. Effect of the Invention

[0012] As described above, the fall prevention fence of the present invention can be installed without narrowing the road width and without reducing the strength of the buried structure's frame. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1(a) is an exploded perspective view of a fall prevention fence according to a first embodiment of the present invention. [Diagram 2] FIG. 1A is a plan view of a fall prevention fence according to a first embodiment of the present invention, and FIG. [Diagram 3] 1(a) and 1(b) are side views showing a state in which a fall prevention fence according to the first embodiment of the present invention is attached to a buried structure. [Figure 4] 10(a) to 10(c) are side views of a fall prevention fence according to a second embodiment of the present invention attached to a buried structure. [Diagram 5] FIG. 10(a) is a plan view of a fall prevention fence according to a third embodiment of the present invention, and FIG. 10(b) is a side view of the fall prevention fence attached to a buried structure. [Figure 6] FIG. 10(a) is a plan view of a fall prevention fence according to a fourth embodiment of the present invention, and (b) is a side view of the fall prevention fence attached to a buried structure. [Figure 7] This is a side view of the state in which the fence portion is laid down on the base portion from the state shown in Figure 6(b). [Figure 8] FIG. 11 is an exploded perspective view of a fall prevention fence according to a fifth embodiment of the present invention. [Figure 9] FIG. 11 is an exploded perspective view of a fall prevention fence according to a sixth embodiment of the present invention. [Figure 10] FIG. 11 is a side view of a fall prevention fence according to embodiment 6 of the present invention attached to a buried structure. [Explanation of symbols]

[0014] 100 Base 110 Beam member 200 Fence section 300 Fall Prevention Fence 500 Buried structures 510 Drainage Channel 520 side wall DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Each embodiment of the present invention will be described below. The shapes of each figure referred to in the following description are conceptual or schematic diagrams for explaining preferred shape and dimensions, and the dimensional ratios do not necessarily match the actual dimensional ratios. In other words, the present invention is not limited to the dimensional ratios in the drawings. Note that, as used in this specification, "upward" refers to a direction toward the upper side in the vertical direction with respect to a buried structure equipped with a drainage channel installed on a horizontal surface, as shown in FIG. 3, and "downward" refers to a direction toward the lower side in the vertical direction.

[0016] <Embodiment 1> 1 and 2 show a fall prevention fence 300 according to a first embodiment of the present invention. Fig. 1 is an exploded perspective view of the fall prevention fence 300, Fig. 2(a) is a plan view of the fall prevention fence 300, and Fig. 2(b) is a side view of the fall prevention fence 300.

[0017] As shown in FIG. 1 and FIG. 2, the fall prevention fence 300 includes a base portion 100 and a fence portion 200. The base portion 100 is made of metal, includes a pair of beam members 110 and a connecting member 120 that connects the beam members 110, and is assembled into a frame shape. An intermediate connecting member 130 is provided at approximately the center of the beam members 110 so as to span the beam members 110 on both sides. The length L1 of the beam members 110 is a length that can be spanned across both side walls of the buried structure, as described below. In addition, connecting members 120 are connected to the ends on both sides of the beam members 110, and flange portions 121 extending outward from the upper ends of the connecting members 120 can be hooked onto and attached to each side wall of the buried structure. Furthermore, abutting portions 124 extending downward from the upper ends of the connecting members 120 can abut against the inside of each side wall of the buried structure. Furthermore, a fence section 200 can be attached to the mounting base 122 extending inward from the lower end of one of the connecting members 120. Also, the fence section 200 can be placed in a laid-down state on the flange section 132 extending from the lower end of the intermediate connecting member 130 toward the mounting base 122 side, as described below.

[0018] The fence section 200 is in the form of a metal lattice-like grating and is in the form of a generally rectangular thin plate. A flat flange section 211 is provided at one end 210 of the fence section 200 so that it can be installed and attached to the mounting base 122. When attaching the fence section 200 to the base 100, the flange section 211 at one end 210 of the fence section 200 is installed on the mounting base 122 of the base 100 with the fence section 200 standing up. As shown in FIG. 2, the tip of a bolt 302 is inserted through a through hole provided in the flange section 211 and the mounting base 122, and a nut 301 is attached to the tip and fastened, so that the fence section 200 is attached so as to protrude upward from the base 100.

[0019] 3 shows the fall prevention fence 300 of the present invention attached to a buried structure 500. FIGS. 3(a) and 3(b) are side views of the fall prevention fence 300 attached to the buried structure 500.

[0020] As shown in FIG. 3(a), the buried structure 500 is in the form of a concrete gutter, and is used by being buried in a road surface G or the like. The buried structure 500 includes a drainage channel 510 for draining collected rainwater and the like, and side walls 520 erected upward from both sides of the drainage channel 510. A flat mounting surface 521 is provided on the upper end side of the side wall 520, on which the flange 121 of the fall prevention fence 300 can be placed. Specifically, as shown in FIG. 3(a), the flanges 121 at both ends of the beam member 110 of the fall prevention fence 300 are placed on the mounting surfaces 521 of the side walls 520 on both sides of the buried structure 500, and the beam member 110 of the fall prevention fence 300 is hung across the side walls 520 on both sides. Since the flanges 121 on both sides of the beam member 110 engage with the side walls 520 from above, the fall prevention fence 300 is attached above the drainage channel 510 to prevent the fall prevention fence 300 from falling into the drainage channel 510. Furthermore, since the abutment parts 124 on both sides of the beam member 110 abut against the inside of the side walls 520, the fall prevention fence 300 is stably attached so as not to shift in the width direction of the drainage channel 510.

[0021] As shown in Fig. 3(a), the fence section 200 attached to the base section 100 protrudes upward from the base section 100, so that the fence section 200 protrudes upward above the road surface G and the drainage channel 510. This makes it easier for people and vehicles moving from the road surface G toward the drainage channel 510 to recognize the presence of the drainage channel 510, and prevents them from falling into the drainage channel 510. In addition, the fence section 200 is not directly attached to the side wall 520 of the buried structure 500 or the road surface G, but is attached to the base section 100 attached so as to span the side walls 520 on both sides of the buried structure 500, so that the width of the road on the road surface G side is not narrowed. Furthermore, when the fall prevention fence 300 is attached to the buried structure 500, a part (e.g., flange 121) of the beam member 110 of the base 100 is attached so as to engage with a part (e.g., mounting surface 521) of the side wall 520. This eliminates the need for processing such as drilling mounting holes in a part of the side wall 520, and prevents damage to the skeleton of the buried structure 500 and a decrease in the strength of the skeleton.

[0022] In addition, when performing maintenance on the drainage channel 510 or when a person intentionally wants to move to the opposite side of the drainage channel 510, the fence section 200 becomes an obstacle and needs to be temporarily removed. The fall prevention fence 300 of the present invention is configured so that the removed fence section 200 can be stored and can be used as a foothold for a person performing maintenance or moving. Specifically, as shown in FIG. 3(a), the nut 301 and the bolt 302 are removed, and the upright fence section 200 is removed from the base section 100. Next, as shown in FIG. 3(b), the removed fence section 200 is laid on the base section 100 and attached so as to cover a part of the drainage channel 510. At this time, one end 210 of the fence section 200 is placed on the mounting base 122 of one of the connecting members 120 and fixed by the nut 301 and the bolt 302. In addition, the other end 220 of the fence portion 200 is placed on the flange portion 132 of the intermediate connecting member 130 and fixed by a nut 301 and a bolt 302.

[0023] In this way, with the fall prevention fence 300 of the present invention, the fence section 200 can be changed between being attached so that it stands up from the base section 100, and being attached so that it is laid down on the base section 100 and covers part of the drainage channel 510, so that the fence section 200 can be stored laid down on the base section 100 so that it does not get in the way, and the fence section 200 can be used as a foothold for people performing maintenance or moving. Also, when the fence section 200 is laid down, the flange section 211 at one end 210 of the fence section 200 protrudes upward from the base section 100, preventing people and the like from falling into the drainage channel 510.

[0024] In addition, the width L2 of the fence portion 200, in other words, the width L2 in the direction along the side walls 520 on both sides when the fence portion 200 is attached so as to cover a part of the drainage channel 510 as shown in FIG. 3(b), is shorter than the width L3 of the drainage channel 510. Therefore, the fence portion 200 does not need to cover the entire width L3 of the drainage channel 510, and the cost of the fence portion 200 can be reduced and the weight of the fence portion 200 can be reduced, making it easy to handle. In particular, as in the conventional case, when the fence portion 200 is used to cover the entire upper part of the drainage channel 510 to prevent people, vehicles, etc. from falling into the drainage channel 510, the width L2 of the fence portion 200 must be as wide as the width L3 of the drainage channel 510, and the fence portion 200 becomes larger, increasing the cost and weight of the fence portion 200. However, as shown in Fig. 3(a), since the fence section 200 is attached in a state where it protrudes upward from the base section 100, even if the width L2 of the fence section 200 is shorter than the width L3 of the drainage channel 510, it is possible to effectively prevent people, vehicles, etc. from falling. Furthermore, as shown in Fig. 3(b), when performing maintenance on the drainage channel 510 or when a person wants to intentionally move to the opposite side of the drainage channel 510, as long as the fence section 200 is installed so as to cover a part of the drainage channel 510, it can be sufficiently used as a foothold even if the width L2 of the fence section 200 is shorter than the width L3 of the drainage channel 510.

[0025] The fall prevention fence 300 is configured so that the fence section 200 can be changed between a state in which it is attached so that it stands up from the base section 100 and a state in which it is attached so that it is laid down on the base section 100 and covers part of the drainage channel 510, but the present invention is not limited to this, and the fence section 200 may be removably fixed to the base section 100, and the removed fence section 200 may be stored in another location. If the fence section 200 is removably fixed to the base section 100, the fence section 200 can be easily removed from the base section 100 as necessary.

[0026] Furthermore, the fence section 200 is detachably fixed to the base section 100 by a fixing member composed of a nut 301 and a bolt 302, but the present invention is not limited thereto, and the fence section 200 may be fixed to the base section 100 by welding or the like so as not to be detachable. Furthermore, the nuts 301 and the bolts 302 are used as fixing members, but the present invention is not limited thereto, and any fixing member may be used as long as the fence section 200 can be detachably fixed to the base section 100. Furthermore, the fence section 200 is in the form of a metal grating, but the present invention is not limited thereto, and the fence section 200 may be made of any material and have any configuration, such as a wooden fence, as long as it allows people, vehicles, etc. to recognize the presence of the drainage channel and prevents falls. Furthermore, the buried structure 500 is not limited to a concrete gutter, and may have any configuration, such as a catchment basin equipped with a drainage channel.

[0027] In addition, the base 100 of the fall prevention fence 300 is configured in a frame shape, but is not limited to this, and may have any configuration as long as it is hung across the side walls 520 on both sides of the buried structure 500 and attached so as to engage with a part of the side walls 520. In addition, the flange 121 of the beam member 110 of the base 100 is configured to engage with the placement surface 521 of the side wall 520, but is not limited to this, and may have any configuration as long as a part of the beam member 110 of the base 100 is configured to engage with a part of the side wall 520. In addition, in FIG. 3(a), it is assumed that people, vehicles, etc. pass on the road surface G on the left side of the drawing, but if it is assumed that people, vehicles, etc. pass on the opposite road surface G on the right side, the attachment direction of the fall prevention fence 300 may be changed so that the fence part 200 faces the road surface G on the right side. Furthermore, the width L2 of the fence portion 200 is shorter than the width L3 of the drainage channel 510, but is not limited to this, and the width L2 of the fence portion 200 may be equal to the width L3 of the drainage channel 510 or longer than the width L3.

[0028] <Embodiment 2> Next, Fig. 4 shows a fall prevention fence 300A according to embodiment 2 of the present invention. Note that the configuration of the fall prevention fence 300A of embodiment 2 is basically the same as the fall prevention fence 300 of embodiment 1 except for the configuration of the fence section 200A, and detailed description thereof will be omitted. Note that Figs. 4(a) to (c) are side views of the fall prevention fence 300A attached to the buried structure 500 (or buried structure 500A).

[0029] First, as shown in FIG. 4(a), the fence section 200A is arch-shaped in a side view and extends in the longitudinal direction of the buried structure 500 (toward the back in the drawing). The surface of the fence section 200A is latticed to prevent people and objects from falling into the drainage channel 510. The fence section 200A is detachably fixed to the connecting member 120A and the intermediate connecting member 130A of the base section 100A so as to protrude upward from the base section 100A. The width L2A of the fence section 200A, that is, the width L2A over which the fence section 200A covers the drainage channel 510, is shorter than the width L3 of the drainage channel 510. Since the fence section 200A is attached in a state of protruding upward from the base section 100A, it is possible to effectively prevent people, vehicles, etc. from falling. Therefore, the fence section 200A does not need to cover the entire width L3 of the drainage channel 510 to prevent falls, which reduces the cost of the fence section 200A and makes it easier to handle because the weight of the fence section 200A can be reduced. Note that the fence section 200A is not limited to an arch-shaped shape when viewed from the side or a grating shape as shown in Fig. 1, and may have any shape as long as it protrudes upward from the base section 100A and is configured to prevent people, vehicles, etc. from falling.

[0030] Next, in Fig. 4(b) and (c), a case where the width L3A of the buried structure 500A is wider than the width L3 of the buried structure 500 shown in Fig. 4(a) is shown. The beam member 110A of the base part 100A of the fall prevention fence 300A is configured to have a long overall length corresponding to the width L3A of the buried structure 500A so that it can be hung over the side walls 520A on both sides of the buried structure 500A. The beam member 110A is provided with a plurality of intermediate connecting members 130A at any interval. Therefore, it is possible to attach a plurality of fence parts 200A to the base part 100A using the intermediate connecting members 130A. Even if a plurality of fence parts 200A are attached to the base part 100A, the sum of the widths L2A of the fence parts 200A, that is, the sum of the widths L2A of the fence parts 200A covering the drainage channel 510A, is shorter than the width L3A of the drainage channel 510A. In this way, since each fence section 200A is attached in a state where it protrudes upward from the base section 100A, it is possible to sufficiently effectively prevent people, vehicles, etc. from falling. Therefore, it is not necessary to cover the entire width L3A of the drainage channel 510A to prevent falls, so the cost of the fence section 200A can be reduced, and the weight of the fence section 200A can be reduced, making it easy to handle.

[0031] In addition, when it is necessary to prevent people, vehicles, etc. from falling into the drainage channel 510A on both sides of the buried structure 500A, the installation position of the intermediate connecting member 130A may be changed and the fence section 200A may be installed on both ends of the fall prevention fence 300A, as shown in Figure 4(c).

[0032] <Embodiment 3> Next, Fig. 5 shows a fall prevention fence 300B according to a third embodiment of the present invention. The configuration of the fall prevention fence 300B according to the third embodiment differs from the fall prevention fence 300 according to the first embodiment only in that it is provided with an auxiliary contact member 140B, and other configurations are basically the same as those of the fall prevention fence 300 according to the first embodiment, so detailed explanations will be omitted. Fig. 5(a) is a plan view of the fall prevention fence 300B, and Fig. 5(b) is a side view of the fall prevention fence 300B attached to a buried structure 500.

[0033] As shown in FIG. 5, the fall prevention fence 300B is provided with an auxiliary abutment member 140B at the end of the beam member 110B. The auxiliary abutment member 140B has a slide member 141B made of a bolt, and the slide member 141B is screwed and attached to a base 111B extending from the end of the beam member 110B. When the slide member 141B of the auxiliary abutment member 140B is rotated, the slide member 141B can move in the front-rear direction relative to the base 111B. In addition, in the fall prevention fence 300B, one end of the beam member 110B is not connected to the end of the other beam member 110B and is independent. Therefore, the auxiliary abutment member 140B provided at the end of the beam member 110B can be easily operated from the outside by an operator.

[0034] 5(b), the width of the drainage channel 510 may vary slightly depending on the type of buried structure 500, and even if the beam member 110B of the fall prevention fence 300B is attached so as to span the side walls 520 on both sides, the fall prevention fence 300B may be displaced in the width direction of the drainage channel 510. Specifically, if the width of the drainage channel 510 varies slightly depending on the type of buried structure 500, the flange portions 121B of the beam member 110B of the fall prevention fence 300B may be engaged with and attached to the side walls 520 on both sides, but the abutment portions 124B may not be able to abut against the inside of the side walls 520, resulting in a gap X. This gap X may cause the fall prevention fence 300B to be displaced in the width direction of the drainage channel 510.

[0035] Therefore, the slide member 141B of the auxiliary abutment member 140B is moved toward the side wall 520, and the tip 142B of the slide member 141B is brought into contact with the inside of the side wall 520. Then, the auxiliary abutment member 140B abuts against the side wall 520 instead of the abutment portion 124B, so that the fall prevention fence 300B can be prevented from shifting in the width direction of the drainage channel 510. Furthermore, by moving the auxiliary abutment member 140B toward the side wall 520 and bringing it into strong contact with the side wall 520, the fall prevention fence 300B becomes difficult to be removed upward, and the fall prevention fence 300B can be prevented from being inadvertently removed and stolen. Note that the auxiliary abutment member 140B includes the slide member 141B in the form of a bolt, but is not limited thereto, and the auxiliary abutment member 140B may have any configuration as long as it is provided in the gap X between the abutment portion 124B and the inside of the side wall 520 and is configured to be able to abut against the side wall 520. Further, the auxiliary contact member 140B is provided at one end of the beam member 110B, but is not limited to this, and the auxiliary contact member 140B may be provided at both end portions of the beam member 110B.

[0036] <Embodiment 4> Next, Fig. 6 and Fig. 7 show a fall prevention fence 300C according to embodiment 4 of the present invention. The configuration of the fall prevention fence 300C according to embodiment 4 differs from the fall prevention fence 300 according to embodiment 1 in that the fence section 200C has a rotating section 290C and the base section 100C has a mounting platform 190C, but other configurations are basically the same as the fall prevention fence 300 according to embodiment 1, so detailed explanations will be omitted. Fig. 6(a) is a plan view of the fall prevention fence 300C, Fig. 6(b) is a side view of the fall prevention fence 300C attached to the buried structure 500, and Fig. 7 is a side view of the fence section 200C laid on the base section 100C from the state shown in Fig. 6(b).

[0037] As shown in Fig. 6, the fence portion 200C is provided with a rotating portion 290C on the side of one end 210C fixed to the base portion 100C. The fence portion 200C is separated into an upper portion 260C and a lower portion 270C with the rotating portion 290C in between, and the lower portion 270C is fixed to the base portion 100C. The upper portion 260C is connected and fixed to the lower portion 270C by the rotating portion 290C, and is configured to be rotatable relative to the lower portion 270C around the rotating portion 290C. In the state shown in Fig. 6(b), the upper portion 260C of the fence portion 200C is fixed with a fixing pin or the like so as not to rotate around the rotating portion 290C.

[0038] Here, when performing maintenance on the drainage channel 510 or when a person intentionally wants to move to the opposite side of the drainage channel 510, the fixing pins or the like are removed and the upper part 260C of the fence unit 200C is rotated around the rotating part 290C as the center, as shown in Fig. 7. Then, the upper part 260C of the fence unit 200C is laid down toward the drainage channel 510 so as to cover a part of the drainage channel 510. At that time, the other end 220C of the fence unit 200C is placed on the mounting stand 190C attached to the base unit 100C, so that the fence unit 200C can be stably used as a foothold for workers.

[0039] In this way, the fall prevention fence 300C can be changed between a state in which the fence section 200C is attached so as to rise upward from the base section 100C and a state in which it is attached so as to be laid down on the base section 100C and cover a part of the drainage channel 510, so that the fence section 200C can be stored lying down on the base section 100C so as not to get in the way, and the fence section 200C can be used as a foothold for people performing maintenance or moving. The placement platform 190C includes a protrusion 191C that protrudes upward from the fence section 200C, so that a person can be prevented from falling into the drainage channel 510. The placement platform 190C is provided on the intermediate connecting member 130C, but can be provided at any position on the base section 100C corresponding to the position of the other end 220C of the fence section 200C.

[0040] <Embodiment 5> Next, Fig. 8 shows a fall prevention fence 300D according to a fifth embodiment of the present invention. Note that the configuration of the fall prevention fence 300D of the fifth embodiment differs from the fall prevention fence 300 according to the first embodiment in that it does not include an intermediate connecting member 130 and that it includes a flange portion 115D, but other configurations are basically the same as the fall prevention fence 300 according to the first embodiment, so detailed description will be omitted. Note that Fig. 8 is an exploded perspective view of the fall prevention fence 300D.

[0041] As shown in FIG. 8, the base 100D does not have an intermediate connecting member 130 fixed between the beam members 110D on both sides. The intermediate connecting member 130 can be provided as desired in the base 100D. If the intermediate connecting member 130 is not provided, the beam member 110D is provided with a flange portion 115D for attaching the fence portion 200D in a lying position. This flange portion 115D extends toward the inside of the base 100D, and is designed so that the side end 201D of the fence portion 200D can be placed on it when removing the fence portion 200D in an upright state and replacing it in a lying position. In this way, the flange portion 115D of the beam member 110D can be used when attaching the fence portion 200D to the base 100D in a lying position. Furthermore, any configuration can be adopted as long as it is possible to attach the fence portion 200D to the base portion 100D in a lying position, without being limited to the flange portion 115D of the beam member 110D or the flange portion 132 of the intermediate connecting member 130 (see Figure 3 (b)).

[0042] <Embodiment 6> 9 and 10 show a fall prevention fence 300E according to a sixth embodiment of the present invention. The configuration of the fall prevention fence 300E according to the sixth embodiment is different from that of the fall prevention fence 300 according to the first embodiment in that the beam member 110E is different. However, other configurations are basically the same as those of the fall prevention fence 300 according to the first embodiment, so detailed explanations will be omitted. Fig. 9 is an exploded perspective view of the fall prevention fence 300E, and Fig. 10 is a side view of the fall prevention fence 300E attached to a buried structure 500.

[0043] As shown in Fig. 9, the base 100E includes a plurality of beam members 110E, which are made of round steel bars bent into an approximately L-shape. Specifically, the beam member 110E includes a top 116E and side portions (117E, 118E) on both sides that are inclined downward from the top 116E. Furthermore, the tip side of each side portion (117E, 118E) extends horizontally, and a contact portion 124E and a flange portion 121E are provided on each tip side. In addition, an attachment portion 119E for attaching a fence portion 200E is provided on the side portion (side portion 117E in Fig. 9) on the side where it is desired to prevent falling.

[0044] When this fall prevention fence 300E is attached to the buried structure 500, it is in the state shown in Fig. 10. In the state shown in Fig. 10, for example, if a person or the like is about to fall into the drainage channel 510 and leans or stands on the fence portion 200E, a downward load is applied to the fence portion 200E. Then, a downward force F1 is applied to the beam member 110E as a whole, centered on the top portion 116E, and the beam member 110E bent in a generally L-shape sinks downward on the top portion 116E side, and each side portion (117E, 118E) on both sides of the top portion 116E is bent and elastically deformed so as to open laterally. Then, a force F2 is applied to each abutting portion 124E at the tip of each side portion (117E, 118E) toward the side wall 520 of the buried structure 500. Therefore, each abutment portion 124E can abut more firmly against the inside of the side wall 520, and the fall prevention fence 300E is more firmly attached to the buried structure 500 so as not to slip out of place. Also, each flange portion 121E at the tip of each side portion (117E, 118E) is pressed toward the side wall 520 of the buried structure 500, so that each flange portion 121E can be securely locked so as not to come off the upper end of the side wall 520, and the fall prevention fence 300E is more firmly attached to the buried structure 500. Therefore, the fall prevention fence 300E can be prevented from coming off the buried structure 500 due to the impact of a person, vehicle, etc. colliding with the fence portion 200E, and it is possible to more reliably prevent a person, vehicle, etc. from falling into the drainage channel 510.

[0045] Although beam member 110E is made of round steel bent into an approximately L-shape, this is not limited to this, and beam member 110E can be made of any material and of any shape as long as it is configured to be able to be slightly elastically deformed in an approximately L-shape.

[0046] The fall prevention fence of the present invention is not limited to the above-mentioned examples, and various modifications and combinations are possible within the scope of the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of the rights.

Claims

1. A fall prevention fence for preventing people from falling into a drainage channel of a buried structure, A base portion having a beam member that is hung between both side walls of the buried structure; A fence portion attached to the base portion so as to protrude upward from the base portion, The beam member of the base portion is attached so as to be engaged with a portion of the side wall, This fall prevention fence is characterized in that the fence section is configured so that it can be changed between a fixed state in which it rises upward from the base section inside the base section, and a state in which it is laid down on the base section and attached so as to cover part of the drainage channel.

2. A fall prevention fence as described in claim 1, characterized in that the fence portion is removably attached to the base portion.

3. A fall prevention fence as described in claim 1 or 2, characterized in that the width of the fence portion is shorter than the width of the drainage channel of the buried structure.

Images