Protective fence

Abstract

To provide a guard fence which can absorb operating errors of stud bolts attached to existing supports for wall railings made of H-shaped steel, etc, and errors in manufacturing panel materials, and can be installed in a short time.SOLUTION: Stud bolts 3 are attached to at least two locations at the top and bottom of the flange of a support 14, a vertical member 21 is attached to the stud bolts 3, the vertical member 21 and a horizontal member 22 consist of a channel member 4 having a U-shaped cross section and multiple connection holes on a closed surface, the vertical member 21 is fixed to the stud bolts 3 via connection holes, the horizontal frame 22 is fixed to any position on an open surface 41 of the vertical frame 21 via a connecting member 5 of a specific shape, and a panel material 6 is fixed to an arbitrary position on the open surface 41 of the horizontal frame 22 via the connecting member 5. The connecting member 5 is configured as such that it can be fixed at any position in an opening groove 40 by rotating a fixing fitting 51 and a resin plate 52 against the channel member 4, fitting and fastening a folding piece 45 into a fitting groove 55.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a protective fence that separates a construction area from other areas. [Background technology]

[0002] Renovation work on railroad viaducts, soundproof walls, utility poles, etc. must be carried out at night when trains are not running to prevent materials, people, and trains from coming into contact with each other. This forces the work to be completed in a short time. Furthermore, while the working population is expected to decrease in the future, the amount of renovation work is increasing, and unless construction efficiency is improved, it will be difficult to continue such renovation work.

[0003] One way to improve construction efficiency is to secure time for work by carrying out such repair work not only at night but also during train operating hours.When repair work is carried out during train operating hours, it is necessary to install safety fences (temporary protective fences) that separate the track on which trains run from the construction work space to prevent contact between materials, people, and trains.

[0004] An example of such a temporary protective fence is the temporary protective wall proposed by the present applicant and described in Patent Document 1. The temporary protective wall described in Patent Document 1 comprises a plurality of support posts 2, a plurality of cross beams 3 spanning these support posts 2, panel materials 4 attached to these cross beams 3, and supporting posts 5 connected at an angle to the support posts 2, the support posts 2 having a pair of U-shaped cross-section members joined at their closed surfaces and having saw blades formed at the ends of their opening grooves, and the supporting posts 5 have U-shaped cross-section members with saw blades formed at the ends of their opening grooves, the supporting posts 5 being located closer to the track R1 than the support posts 2, and the support posts 2 and 5 being connectable to any position on the saw blades via connecting members that mesh with the saw blades.

[0005] The temporary protective wall described in Patent Document 1 allows the supporting columns to be fixed at any height and position, making it easy to install the supporting columns while avoiding obstacles such as water pipes whose diameters and heights vary depending on the location. In addition, the supporting columns, which are diagonal members, are not located on the construction area side, which is partitioned off by panels, ensuring work space and access.

[0006] However, railroad viaducts often use inverted L-shaped balustrades (hereinafter referred to as inverted L-shaped balustrades) with H-shaped steel or similar supports and concrete panel members arranged in the ceiling and wall sections. If the temporary protective wall of Patent Document 1 is used in work to repair or reinforce such inverted L-shaped balustrades or work to repair or reinforce utility poles or similar structures with an inverted L-shaped balustrade in place, it will interfere with the supports made of H-shaped steel or similar for the existing inverted L-shaped balustrades, and the supports of the temporary protective wall will need to be set back toward the track from the existing supports of the inverted L-shaped balustrades.

[0007] However, depending on the local conditions, the setback of these support pillars could violate the building gauge when trains are running.In addition, new support pillars would need to be installed, and this work would all be done at night when trains were not running, which limited the number of hours that could be worked per day and lengthened the construction period.

[0008] One way to solve these problems is to use existing supports, such as H-shaped steel beams, as the supports for the temporary protective wall. However, if stud bolts are attached to the existing supports and cross members are then installed directly onto them, the installation height of the cross members becomes fixed, which creates a new problem: when attaching the panels of the temporary protective wall, construction errors when attaching the stud bolts and manufacturing errors in the panels cannot be accommodated, making it impossible to attach the panels to the cross members. Another method is to fine-tune the installation position of the stud bolts for each existing support, taking these errors into account, but this requires time to position the stud bolts, which increases the construction effort. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent Publication No. 2021-8724 Summary of the Invention [Problem to be solved by the invention]

[0010] Therefore, the present invention was devised in consideration of the above-mentioned problems, and its purpose is to provide a protective fence that can be installed in a short time, even when existing supports of wall parapets such as H-shaped steel are used as supports for the protective fence, and can absorb installation errors of the stud bolts attached to the supports and manufacturing errors of the panel materials. [Means for solving the problem]

[0011] The protective fence according to the first invention is a protective fence that separates a construction area from other areas, in which a frame made of a lattice-like combination of vertical members and horizontal members is attached to existing posts, and panel members are attached to the frame, and stud bolts are attached to at least two locations, the upper and lower, of the flanges of the posts, and the vertical members are attached to the stud bolts, and the vertical members and the horizontal members are made of channel members with a U-shaped cross section and a plurality of connection holes on the closed surface, and the connection holes of the vertical members are fixed to the stud bolts, and the horizontal members are connected to the open ends of the vertical members via connection members of a specific shape. The panel material is fixed at any position on the open surface of the cross member via the connecting member, the channel member has an opening groove with a folded piece on the open surface, the connecting member comprises a fixing bracket having a fitting groove that fits with the folded piece, and a resin plate fixed to the fixing bracket, and the connecting member is configured to be fixable at any position in the opening groove by rotating the fixing bracket and the resin plate relative to the channel member to fit the fitting groove into the folded piece and tightening it.

[0012] The protective fence of the second invention is characterized in that, in the first invention, the horizontal members are fixed to the vertical members via horizontal member fixing brackets, and the horizontal member fixing brackets consist of channel members with a U-shaped cross section and multiple connection holes on their closed surface, with the closed surface facing the vertical member and the open surface of the U-shaped cross section facing the horizontal member, and are fixed respectively via the connecting members, and the horizontal members are attached so that they overlap the horizontal member fixing brackets in the longitudinal direction, making their length less than the spacing between the posts.

[0013] The protective fence of the third invention is characterized in that, in the second invention, the cross member fixing bracket is attached with a cross member support member with an L-shaped or J-shaped cross section on which the longitudinal end of the cross member is placed.

[0014] The protective fence according to the fourth invention is characterized in that, in any one of the first to third inventions, the stud bolts are driven into and welded to the flange surfaces of the posts. [Effects of the Invention]

[0015] According to the first to fourth inventions, the closed surface of the horizontal member can be fixed at any position on the open surface of the vertical member, which is made of a channel member with a U-shaped cross section. This allows the horizontal member to be fixed at any position in the vertical direction relative to the vertical member fixed to the stud bolt. Therefore, even if there is an installation error in the stud bolt attached to the support or an error in the manufacturing of the panel member, the panel member can be easily fixed to the horizontal member. Furthermore, according to the first to fourth inventions, even if excessive tension is applied to the fastening bolt, the fixing metal fittings of the connecting member will not come out of the channel member, resulting in a highly safe structure. Furthermore, the fixing metal fittings can be slid and fixed at any position while inserted into the open surface of the channel member of the vertical member or horizontal member, easily accommodating installation errors in the stud bolts and manufacturing errors in the panel.

[0016] Furthermore, according to the first to fourth inventions, the vertical members of the frame can be fixed simply by installing stud bolts in at least two locations, one above and one below, on the existing support pillars. Therefore, when installing multiple tiers (multiple pieces) of horizontal members in the vertical direction, it is necessary to install stud bolts according to the number of tiers, but with the present invention, this can be achieved by installing stud bolts in at least two locations, one above and one below, on the support pillars, thereby reducing the number of stud bolts that are installed on site, which takes time to install.

[0017] In addition, according to the first to fourth inventions, the horizontal members can be fixed at any position on the vertical members, so after the vertical members are installed, the number of horizontal members and their positions can be freely selected. Therefore, even if the number and positions of horizontal members change depending on the local conditions, the stud bolt installation work and vertical member installation work can be done mechanically, eliminating the need for work such as positioning, and making the work extremely easy to install.

[0018] In particular, according to the second invention, the use of horizontal member fixing brackets can reduce the number of vertical members required, thereby reducing construction costs. Furthermore, depending on the hole position on the blocking surface of the horizontal member, the hole position may not match the vertical member position, making it impossible to attach the horizontal member to the vertical member. However, by using horizontal member fixing brackets, the horizontal member can be securely fixed to the vertical member regardless of the hole position on the blocking surface of the horizontal member. Furthermore, even if the spacing between existing posts is slightly different or there is a slight error in the length of the horizontal member, this can be accommodated by using horizontal member fixing brackets.

[0019] In particular, according to the third invention, when fixing a cross member to a cross member fixing bracket with a connecting member, two people are required: one to support the cross member and one to fix the cross member with the connecting member.However, by installing a cross member support member, the cross member can be temporarily supported, and the work can be done by one person, thereby achieving labor savings in construction.

[0020] In particular, according to the fourth invention, the stud bolts are fixed by hammering and welding, so no welding machine is required and construction can be carried out even in rainy weather. Furthermore, when fixing the stud bolts by hammering and welding, only a small pilot hole in the flange is required, and the work time is significantly shorter than with welding or screwing. Furthermore, no sparks are generated, so there is no need to worry about fire, making it easier to work on construction sites. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view showing a safety fence according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the safety fence as viewed from the track side (inside) toward the railing side (outside). [Figure 3] FIG. 3 is a plan view showing the protective fence. [Figure 4] FIG. 4 is a rear view of the protective fence as viewed from the inside of the inverted L-shaped balustrade toward the track. [Figure 5] FIG. 5 is an enlarged plan view of part A in FIG. [Figure 6] FIG. 6 is a vertical cross-sectional view taken along line BB in FIG. [Figure 7] FIG. 7 is an enlarged view of part C in FIG. [Figure 8] FIG. 8 is an enlarged view of part D in FIG. [Figure 9] FIG. 9 is a side view of the stud bolt of the safety fence as viewed in the direction perpendicular to the axis. [Figure 10] FIG. 10 is a diagram showing a channel member of the same protective fence, where (a) is a cross-sectional view perpendicular to the longitudinal direction, and (b) is a side view seen from the open surface toward the closed surface. [Figure 11] Figure 11 shows a twist lock channel nut, a connecting member of the protective fence, where (a) is a front view seen from the bolt insertion direction, (b) is a plan view, (c) is a right side view, and (d) is a perspective view. [Figure 12] FIG. 12 is a plan view showing a safety fence according to a second embodiment of the present invention. [Figure 13]FIG. 13 is a rear view of the protective fence as viewed from the inside of the inverted L-shaped balustrade toward the track. [Figure 14] FIG. 14 is an enlarged plan view of part E in FIG. [Figure 15] FIG. 15 is a vertical cross-sectional view taken along line FF in FIG. [Figure 16] FIG. 16 is an enlarged view of part G in FIG. [Figure 17] FIG. 17 is a perspective view showing a cross member receiving member of the protective fence. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, a safety fence according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0023] [First embodiment] 1 to 11, a guardrail 1 according to a first embodiment of the present invention will be described. The guardrail 1 according to this embodiment will be described as a temporary guardrail that separates the track from the construction area when repair work is carried out to repair an existing inverted L-shaped railing 10 erected along a dedicated viaduct over which high-speed trains such as the Shinkansen pass. However, it goes without saying that the guardrail according to the present invention is not limited to temporary guardrails, and can also be applied to permanent guardrails.

[0024] Fig. 1 is a perspective view showing a guardrail 1 according to a first embodiment of the present invention, Fig. 2 is a front view showing the guardrail 1 as viewed from the track side (inside) toward the railing side (outside), Fig. 3 is a plan view showing the guardrail 1, and Fig. 4 is a rear view showing the guardrail 1 as viewed from the inside of an inverted L-shaped railing 10 toward the track side. Fig. 5 is an enlarged plan view of part A in Fig. 3, Fig. 6 is a vertical cross-sectional view taken along line BB in Fig. 3, Fig. 7 is an enlarged view of part C in Fig. 6, and Fig. 8 is an enlarged view of part D in Fig. 6.

[0025] Here, an inverted L-shaped balustrade refers to a wall balustrade that is a soundproof wall with an inverted L-shaped cross section, in which panel material is installed on the wall surface and its folded ceiling surface, and has the effect of reducing noise that goes beyond the soundproof wall.

[0026] 3 and 6, the illustrated existing inverted L-shaped balustrade 10 has multiple outer supports 12 erected on a wall balustrade 11 made of reinforced concrete, and multiple layers of concrete (cement-based) panel materials 13 made of concrete or mortar fitted between the outer supports 12. Furthermore, the inverted L-shaped balustrade 10 has multiple inner supports 14 on the track side (inside) of the outer supports 12, and ceiling support steel materials 15 are suspended between the upper ends of the outer supports 12 and the upper ends of the inner supports 14, with panel materials 13 also installed on the ceiling surface.

[0027] As shown in Figures 1 to 6, the protective fence 1 according to this embodiment is a protective fence in which the existing inner supports 14 of the aforementioned inverted L-shaped balustrade 10 are used as supports, a lattice-shaped frame body 2 is attached to the inner supports 14, and panel members 6, which will be described later, are attached to the frame body 2. This frame body 2 is a frame body in which vertical members 21 and horizontal members 22 are combined in a lattice pattern to support the protective fence 1. Furthermore, this protective fence 1 is installed along the track R1, and separates the track R1 from the construction area CA, thereby preventing workers from entering the track R1 side or accidentally coming into contact with a train when moving around with materials, etc.

[0028] (post) The inner support columns 14 are supports used in the existing inverted L-shaped balustrade 10, and in the illustrated embodiment are H-shaped steel. As shown in Figures 6 and 7, stud bolts 3 for bolting the vertical members 21 of the frame body 2 are driven and welded to the top and bottom of the inner support columns 14 at a total of four locations, two at the top and two at the bottom of each vertical member 21. Of course, the existing inner support columns 14 are not limited to H-shaped steel, and the present invention can be applied to any support column used in the existing inverted L-shaped balustrade 10, such as channel steel or steel combined with C-shaped channels, and which has a flange for installing the stud bolts 3. Furthermore, it is sufficient that the stud bolts 3 are provided in four or more locations.

[0029] Here, driving welding differs from non-metal welding in that it refers to the process of using a driving machine (tack driver) or the like to drive and press the stud bolt 3 into a pilot hole (not shown) with a smaller diameter than the stud bolt 3 at high speed, generating heat (frictional heat) that melts the metal base material and the bolt, integrating and fastening them together. This pilot hole is drilled in advance into the flange surface of the existing inner support 14 so that it is slightly smaller in diameter than the base end 31 of the stud bolt 3 (described below).

[0030] Of course, the method of fastening the stud bolt 3 to the inner support 14 is not limited to the driving-in welding method, but a screwing method can also be used, in which the threaded portion of the stud bolt is screwed into a small-diameter pilot hole to secure it. Also, the stud bolt can be welded to the inner support 14 using a welding machine such as arc welding.

[0031] However, the drive-in welding method can be performed using handy tools that can be easily carried with one hand, does not require a large current like arc welding, and can be performed even in rainy weather. Also, when fixing stud bolts using the drive-in welding method, only a small pilot hole in the flange is required, and the work time is overwhelmingly shorter than with the screw-in method. Furthermore, no sparks are generated, so there is no need to be concerned about flammable materials, making it excellent for use on construction sites.

[0032] (stud bolt) The stud bolt 3 is a stainless steel bolt material, and as shown in Figure 9, has a threaded portion 30 with an M10 thread of a predetermined length that can be used to screw the vertical member 21, and a base end portion 31 that is formed at one longitudinal end of the threaded portion 30 and has a diameter smaller than the diameter of an M10 bolt. Figure 9 is a side view of the stud bolt 3 as viewed in a direction perpendicular to the axis.

[0033] 9, a sealing material 32 made of neoprene rubber and a truncated cone-shaped washer 33 are fitted into the base end 31. A tapered surface 31a is formed on the circumference of the tip of the base end 31. This tapered surface 31a functions to guide the base end 31 when it is driven into a pilot hole with a small diameter.

[0034] (Frame) The frame 2 is made up of vertical members 21 and horizontal members 22 assembled in a lattice pattern via connecting members 5, which will be described later. In this embodiment, as shown in FIGS. 3 and 6, vertical members 21 are installed at both longitudinal ends of horizontal members 22. In other words, six horizontal members 22 are joined at predetermined intervals between two vertical members 21 so that they intersect at right angles. Because strong wind pressure acts on the safety fence 1 during strong winds and when trains are running, the horizontal members 22 that resist this wind pressure must be able to withstand these loads. For this reason, a structure advantageous in terms of strength is achieved by setting the length of the horizontal members 22 to the pitch of the existing support posts (inner support posts 14) and supporting both ends of the horizontal members 22 with vertical members 21 fixed to the support posts.

[0035] (Channel member) Both the vertical members 21 and the horizontal members 22 are composed of channel members 4 having a U-shaped cross section. As shown in Fig. 10, this channel member 4 is a member having an open surface 41 with an open groove 40 formed on one side of the rectangular box-shaped cross section (one surface of the square tube), and a closed surface 42 on the opposite side of the open surface 41. Fig. 10 shows the channel member 4, where (a) is a cross-sectional view perpendicular to the longitudinal direction, and (b) is a side view seen from the open surface 41 toward the closed surface.

[0036] Connection holes for connecting members to each other are drilled in this closed surface 42. As shown in Fig. 10, two types of connection holes are provided: elongated holes 43 that are long in the longitudinal direction of the channel member 4, and circular holes 44. In the illustrated embodiment, the channel member 4 is provided with the elongated holes 43 and the circular holes 44 alternately.

[0037] 10(a), folded pieces 45 that are folded back into a U-shaped cross section are formed on both edges of the opening groove 40. These folded pieces 45 fit into fitting grooves of fixing metal fittings 51 of the connecting member 5 described below.

[0038] As shown in FIG. 10(a), a plurality of circular holes 44 are formed on both side surfaces 46 of the channel member 4 as connection holes.

[0039] (Vertical member) As shown in Figure 5, the vertical member 21 is joined to the inner support 14 by inserting a stud bolt 3, which has been driven into and welded to the inner support 14 of the existing inverted L-shaped balustrade 10, into the connection hole on the blocking surface 42, and tightening it with a nut (in the illustrated form, an M10 seat nut N) that screws onto the stud bolt 3.

[0040] (Horizontal material) The horizontal members 22 are joined via connecting members 5, which will be described later, so that the open faces 41 of the vertical members 21 abut against the closed faces 42 of the horizontal members 22 and the longitudinal directions of the vertical members 21 and the horizontal members 22 are perpendicular to each other. In the protective fence 1 according to this embodiment, as shown in Figures 1, 2, 6, etc., six (generally, four to eight) horizontal members 22 are joined in the vertical direction at predetermined intervals that allow them to withstand the wind pressure of high-speed trains.

[0041] (connecting member) The connecting member 5 is composed of a bolt B (an M10 bolt in this embodiment) (see FIGS. 6 and 7) and a twist-lock channel nut 50 that screws into the bolt B. As shown in FIG. 11, the twist-lock channel nut 50 is composed of a fixing bracket 51, which is a steel material with a shallow U-shaped groove cut diagonally to form a parallelogram when viewed from the front, and a resin plate 52 made of resin that is fixed to the fixing bracket 51. FIG. 11 shows the twist-lock channel nut 50 of the connecting member 5, with (a) being a front view as seen from the bolt insertion direction, (b) being a plan view, (c) being a right side view, and (d) being a perspective view.

[0042] This fixing bracket 51 has a cylindrical threaded portion 53 with a threaded groove in the center to screw in with an M10 bolt, and a grooved edge 54 with four triangular mating grooves 55 formed therein to mate with the aforementioned folded piece 45.

[0043] The resin plate 52 comprises a rectangular plate portion 56, a pair of wing portions 57 protruding from the plate portion 56 on both sides in two directions, and an attachment portion 58 that is continuous with the plate portion 56 and is fitted onto the outer periphery of the screw portion 53.

[0044] The resin plate 52 is fixed to the fixing metal fitting 51 by caulking the edge 54 with the fitting portion 58 fitted around the cylindrical threaded portion 53 .

[0045] When a bolt is inserted into the threaded portion 53 of this twist-lock channel nut 50 and the bolt is rotated with a power tool or the like, the engagement groove 55 abuts and latches onto the folded-over piece 45 of the channel member 4, stopping the rotation of the twist-lock channel nut 50. If the bolt is continued to be rotated with a power tool or the like after the rotation of the twist-lock channel nut 50 has stopped, the threaded portion 53 that threads onto the bolt is tightened, and the twist-lock channel nut 50 is pulled toward the head of the bolt.

[0046] Therefore, when the twist lock channel nut 50 is inserted into the vertical member 21 through the opening groove 40 of the vertical member 21, the open surface 41 of the vertical member 21 is abutted against the closed surface 42 of the horizontal member 22, and a bolt is inserted into the connecting hole of the horizontal member 22 and tightened, the fitting groove 55 of the twist lock channel nut 50 bites into the folded piece 45 of the vertical member 21, and the horizontal member 22 can be firmly fixed at any position in the opening groove 40 of the vertical member 21.

[0047] (Panel material) The panel material 6 is made of a transparent resin plate, and in this embodiment, it is made of polycarbonate, which has impact resistance 250 times or more that of general quartz glass. The panel material 6 according to this embodiment has a vertically long rectangular shape with a thickness of 5 mm, a height of 2400 mm, and a width of 500 mm. The density of polycarbonate is 1.2 g / cm 3 Each panel material 6 weighs only 7,200 g, making it easy to carry manually. Therefore, the panel material 6 can be installed without using a lifting machine, resulting in extremely high work efficiency.

[0048] Of course, the panel material according to the present invention is not limited to polycarbonate, but can be metal folded plates or other resin panels. However, by using transparent resin panels, the situation inside the track can be seen, sunlight can enter, making it brighter, it is lightweight, easy to transport, and improves workability.

[0049] The number of horizontal members varies depending on the height of the panel material 6, and generally, about four to eight horizontal members 22 are joined to one vertical member 21. Therefore, when directly fixing the horizontal members 22 to the inner support posts 14, which are existing H-shaped steel supports, via stud bolts 3, it is necessary to install four to eight stud bolts per side of the horizontal members (eight to sixteen on both sides of the horizontal members), which corresponds to the number of horizontal members 22, on the inner support posts 14. However, in the protective fence 1 according to this embodiment, the vertical members 21 are fixed above and below the flange surfaces of the inner support posts 14, so only two stud bolts 3 are required for the number of vertical members 21. Because the installation of the stud bolts 3 is performed on-site, reducing the number of stud bolts makes it possible to reduce construction labor and costs.

[0050] (reinforcement material) 6, 7, etc., the panel material 6 is attached to the frame 2 via a reinforcing material 7. Specifically, as shown in Fig. 7 and 8, the reinforcing material 7 is a flat bar 71 made of a steel strip, which protects the portion that comes into contact with the bolt B, and an angle member 72 made of steel, which is the reinforcing material 7, is interposed between the cross member 22 and the panel material 6 on the balustrade side of the panel material 6 in order to improve bending rigidity against strong winds when a high-speed train passes.

[0051] 7 and 8, the open surface 41 of the vertical member 21 is brought into contact with the closed surface 42 of the horizontal member 22, and the vertical member 21 and horizontal member 22 are joined with the connecting member 5 to form the frame 2. Then, the twist-lock channel nut 50 is inserted into the horizontal member 22 through the open groove 40 of the horizontal member 22, and the bolt B of the connecting member 5 is inserted into the joining holes of the angle member 72, panel member 6, and flat bar 71 and rotated. Then, as described above, the fitting groove 55 of the twist-lock channel nut 50 bites into the folded piece 45 of the horizontal member 22, and the panel member 6 or the like can be fixed at any position in the open groove 40 along the longitudinal direction of the horizontal member 22.

[0052] (Sealing material) Furthermore, as shown in Figures 6 and 8, a sealing material 9 made of bent steel plate (highly corrosion-resistant plated steel plate in this embodiment) is attached to the lower outside (construction area CA side) of the protective fence 1 in this embodiment to seal the lower opening of the panel material 6.

[0053] As shown in FIGS. 6 and 8, this blocking material 9 is bolted to a stud bolt 3 welded to the outer flange of the existing inner support 14.

[0054] With the protective fence 1 according to the embodiment of the present invention described above, the joining of channel members 4, such as the vertical members 21 and horizontal members 22, and the joining of channel members 4 and other members, such as panel members 6, can be fixed at any position in the open groove 40 of the channel member 4 using the connecting members 5. As a result, the horizontal members 22 can move freely up and down relative to the vertical members 21 fixed to the stud bolts 3, and even if there is an installation error in the stud bolts 3 attached on-site to the existing inner supports 14, or if there is a manufacturing error in the panel members 6, the panel members 6 can be easily fixed to the horizontal members 22.

[0055] Furthermore, because the height of panel materials generally exceeds 2 m, the panel material 6 requires four to eight horizontal members 22 to withstand wind loads. When the horizontal members 22 are directly fixed to existing supports via stud bolts 3, four to eight stud bolts 3 (eight to sixteen stud bolts on both sides of the horizontal members), corresponding to the number of horizontal members 22, must be installed on the existing supports. However, with the protective fence 1 according to this embodiment, at least two stud bolts 3 are required to secure the upper and lower parts of each vertical member 21 to the flange surface of the existing inner support 14. Therefore, with the protective fence 1, by reducing the number of stud bolts 3 that must be installed on-site, which is time-consuming, it is possible to reduce the construction time and costs involved in installing the entire protective fence 1.

[0056] Furthermore, the spacing of existing support posts (such as the inner support posts 14) in the track direction may vary depending on local conditions. Therefore, the surface pressure due to wind loads varies depending on the spacing of the existing support posts, and the number of cross members 22 required also varies. Accordingly, the vertical spacing at which the cross members 22 are attached also varies. Therefore, when the cross members 22 are directly fixed to the existing support posts via stud bolts 3, the positioning of the stud bolts 3 must be adjusted each time depending on the spacing between the support posts, which is very cumbersome work at the construction site. On the other hand, with the protective fence 1, the cross members 22 can be fixed to any position on the vertical members 21, so after the vertical members 21 are installed, the number of cross members 22 and the vertical spacing between the cross members 22 can be freely selected. Therefore, with the protective fence 1, the installation of the stud bolts 3 and the installation of the vertical members 21 can be performed mechanically regardless of the spacing of the existing inner support posts 14, resulting in extremely easy construction.

[0057] Next, a protective fence 1' according to a second embodiment of the present invention will be described using Figures 12 to 17. The protective fence 1' according to the second embodiment differs from the previously described protective fence 1 mainly in that the horizontal members 22 are fixed to the vertical members 21 via horizontal member fixing brackets 23, and therefore this point will be mainly described; identical components will be given the same reference numerals and their description will be omitted.

[0058] Fig. 12 is a plan view showing a protective fence 1' according to a second embodiment of the present invention, and Fig. 13 is a rear view showing the protective fence 1' as seen from the inside of the inverted L-shaped balustrade 10 toward the track. Also, Fig. 14 is an enlarged plan view of part E in Fig. 12, Fig. 15 is a vertical cross-sectional view taken along line FF in Fig. 12, and Fig. 16 is an enlarged view of part G in Fig. 15. Finally, Fig. 17 is a perspective view showing a cross-member receiving member 24 of the protective fence 1'.

[0059] 12 and 14, in the frame body 2' of the protective fence 1', the horizontal members 22 are not directly joined to the vertical members 21 with the connecting members 5, but are fixed via horizontal member fixing fittings 23. This horizontal member fixing fitting 23, like the vertical members 21 and horizontal members 22, is made up of the channel member 4 described above.

[0060] 14 and 16, the closed surface 42 of the horizontal member fixing bracket 23 is arranged on the vertical member 21 side, and the open surface 41 is arranged on the horizontal member 22 side, and they are joined by the connecting member 5 so that the longitudinal direction of the vertical member 21 and the longitudinal direction of the horizontal member fixing bracket 23 are perpendicular to each other. Then, along the longitudinal direction of the horizontal member fixing bracket 23 fixed perpendicular to the vertical member 21, the open surface 41 of the horizontal member fixing bracket 23 is arranged to abut against the closed surface 42 of the horizontal member 22, and they are joined by the connecting member 5.

[0061] The length of the horizontal member fixing metal fittings 23 is 200 mm to 1000 mm. This is because the length of the portion where the horizontal member 22 overlaps with the horizontal member fixing metal fittings 23 in the longitudinal direction needs to be 100 mm or more, and considering that different horizontal members 22 are attached to both ends of the horizontal member fixing metal fittings 23, the length of the horizontal member fixing metal fittings 23 needs to be 200 mm or more.

[0062] Furthermore, when renovating the inverted L-shaped balustrade 10, the ceiling panel (panel material 13) and its support material are removed, leaving the upper end of the existing inner support pillar 14 free. This makes the inner support pillar 14 more likely to collapse, and unless the rigidity is increased to prevent deformation of the entire guardrail 1', there is a risk of violating the construction gauge toward the train. Therefore, by increasing the length of the cross member fixing bracket 23 and lengthening the overlap with the cross member 22, it is possible to prevent deformation of the entire guardrail 1'.

[0063] However, if the length of the horizontal member fixing metal fittings 23 exceeds 1000 mm, the disadvantage of increased cost becomes greater than the improvement in bending rigidity, so the length of the horizontal member fixing metal fittings 23 is preferably in the range of 200 mm to 1000 mm.

[0064] In addition, in the frame body 2' of the protective fence 1', a cross member receiving member 24 with an L-shaped or J-shaped cross section is attached to the cross member fixing bracket 23, on which the longitudinal end of the cross member 22 is placed, and the cross member fixing bracket 23 and the cross member 22 are joined with a connecting member 5.

[0065] 17, the horizontal member receiving member 24 is a member with a J-shaped cross section having a predetermined length corresponding to the length of the horizontal member fixing bracket 23. A plurality of bolt holes 24a for inserting the bolts B of the connecting member 5 are drilled in the surface of the horizontal member receiving member 24 facing the vertical member 21.

[0066] This cross member receiving member 24 is attached to the cross member fixing bracket 23 by being sandwiched between the vertical member 21 and the cross member fixing bracket 23 when a bolt B is inserted into this bolt hole 24a.

[0067] In addition to the above-described effects, the protective fence 1' according to the second embodiment of the present invention can reduce the number of vertical members 21 required by using the horizontal member fixing brackets 23, thereby reducing construction costs. Furthermore, depending on the position of the holes in the blocking surface 42 of the horizontal member 22, the joint position with the vertical member 21 may be between the circular hole 44 and the elongated hole 43, which may prevent the horizontal member 22 from being attached to the vertical member 21. However, by using the horizontal member fixing brackets 23, the horizontal member 22 can be reliably fixed to the vertical member 21 regardless of the position of the holes in the blocking surface 42 of the horizontal member 22. Furthermore, the use of the horizontal member fixing brackets 23 can address cases where the spacing between the inner supports 14, which are existing supports, is slightly different, or there is a slight error in the length of the horizontal members 22.

[0068] Furthermore, when fixing the cross member 22 to the cross member fixing bracket 23 with the connecting member 5, it is thought that this will require two people to work together: one to support the cross member 22 and one to fix the cross member 22 with the connecting member 5; however, by installing the cross member support member 24, it becomes possible to temporarily support the cross member 22.

[0069] Therefore, with the protective fence 1', by placing both longitudinal ends of the cross member 22 on the cross member receiving members 24 and then fixing the cross member 22 with the connecting members 5, these two tasks can be performed by one person, thereby achieving labor savings in construction.

[0070] Although the protective fences 1, 1' according to the embodiments have been described in detail above, the embodiments described above and shown in the drawings are merely specific embodiments for carrying out the present invention, and therefore the technical scope of the present invention should not be interpreted as being limited by the exemplified embodiments.

[0071] In particular, the guardrail according to the embodiment of the present invention has been described as a guardrail installed along the track and supported by the supports of the existing inverted L-shaped railing 10 erected along a dedicated viaduct over which high-speed trains such as the Shinkansen pass. However, the guardrail according to the present invention can also be applied to temporary or permanent guardrails that separate the track from the construction area, and in which a frame body made of a lattice-like combination of vertical and horizontal members is attached to supports, and panel members are attached to the frame body. It should be noted that the present invention is applicable as long as there are posts at the locations where the guardrails are to be installed, and is not limited to the railway field with tracks, but is also applicable to various fields that separate construction areas from other areas, such as road fields. [Explanation of symbols]

[0072] 1,1': Protective fence 2,2':Frame 21: Vertical member 22: Horizontal material 23: Horizontal member fixing bracket 24: Horizontal member support member 24a: Bolt hole 3: Stud bolt 30:Threaded part 31: Proximal end 31a: Tapered surface 32: Sealing material 33: Washer 4: Channel material 40: Opening groove 41:Open surface 42:Occluded surface 43: Long hole 44:Circular hole 45: Folded piece 46: Side 5: Connection parts B: Bolt 50: Twist lock channel nut 51: Fixing bracket 52: Resin plate 53:Threaded part 54: Edge 55:Mating groove 56: Plate section 57: Wing Club 58: Fitting part 6: Panel material 7: Reinforcement 71: Flat bar 72: Angle iron 9: Sealing material 10; Inverted L-shaped railing 11: Wall parapet 12:Outer support 13: Panel material 14:Inner support 15: Ceiling support steel CA:Construction area R1: Orbit

Claims

1. A protective fence that separates a construction area from other areas, in which a frame body made of vertical members and horizontal members combined in a lattice pattern is attached to existing posts, and panel materials are attached to the frame body, Stud bolts are attached to at least two locations, the upper and lower, of the flange of the support column, and the vertical member is attached to the stud bolts, The vertical members and the horizontal members are made of channel members having a U-shaped cross section and a plurality of connection holes on a closed surface, The vertical member has the connection hole fixed to the stud bolt, and the horizontal member is fixed to any position on the open surface of the vertical member via a connection member with a specific shape, The panel material is fixed to an arbitrary position on the open surface of the horizontal member via the connecting member, The channel member has an open groove having a folded piece on the open surface, the connecting member includes a metal fixture having a fitting groove that fits with the folded piece, and a resin plate fixed to the metal fixture, The connecting member is configured to be fixed at any position in the opening groove by rotating the fixing metal fitting and the resin plate relative to the channel member, engaging the fitting groove with the folded piece, and tightening the fitting groove. A protective fence characterized by:

2. The horizontal member is fixed to the vertical member via a horizontal member fixing bracket, The horizontal member fixing fitting is made of a channel member having a U-shaped cross section and a plurality of connection holes on a closed surface, the closed surface being arranged on the vertical member side and the open surface of the U-shaped cross section being arranged on the horizontal member side, and they are fixed to each other via the connecting member, The horizontal member is attached to the horizontal member fixing bracket so that it overlaps with the horizontal member fixing bracket in the longitudinal direction, and the length of the horizontal member is equal to or less than the interval between the support posts. The protective fence according to claim 1,

3. The horizontal member fixing fixture is fitted with a horizontal member receiving member having an L-shaped or J-shaped cross section on which the longitudinal end of the horizontal member is placed. The protective fence according to claim 2, characterized in that

4. The stud bolt is driven into the flange surface of the support and welded. The protective fence according to any one of claims 1 to 3, characterized in that

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