JP7791010B2 - protective fence - Google Patents

Description

The present invention relates to a protective fence that separates a construction area from other areas.

Renovation work on railroad viaducts, soundproof walls, utility poles, and other structures 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 work to be completed in a short timeframe. Furthermore, while the working population is expected to decline in the future, the amount of renovation work is increasing, making it difficult to continue such renovation work unless construction efficiency is improved.

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. If 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.

An example of such a temporary protective fence is the temporary protective wall described in Patent Document 1, proposed by the present applicants. The temporary protective wall described in Patent Document 1 comprises multiple support posts 2, multiple cross beams 3 spanning the support posts 2, panel materials 4 attached to the cross beams 3, and support posts 5 connected at an angle to the support posts 2. The support posts 2 are formed by joining the closed surfaces of a pair of U-shaped cross-section members and forming saw blades at the ends of their opening grooves, while the support posts 5 are U-shaped cross-section members with saw blades formed at the ends of their opening grooves. The support posts 5 are located closer to the track R1 than the support posts 2, and the support posts 2 and 5 can be connected to any position on the saw blades via connecting members that mesh with the saw blades.

The temporary protective wall described in Patent Document 1 allows for the support columns to be fixed at any height and position, making it easy to install the support columns while avoiding obstacles such as water pipes, which have different diameters and heights depending on the location. Furthermore, since the support columns, which act as diagonal members, are not located on the construction area defined by panels, work space and access paths are secured.

However, the railings of railway viaducts often use inverted L-shaped structures (hereinafter referred to as inverted L-shaped railings) with H-shaped steel supports and concrete panel members on the ceiling and wall sections. If the temporary protective wall described in Patent Document 1 were used in work to repair or reinforce such inverted L-shaped railings or to repair or reinforce utility poles with inverted L-shaped railings in place, it would interfere with the H-shaped steel supports of the existing inverted L-shaped railings, and the supports of the temporary protective wall would need to be set back toward the track from the existing supports of the inverted L-shaped railings.

However, there was an issue that the setback of these support pillars could violate the building gauge when trains are running, depending on local conditions. Furthermore, new support pillars had to be installed, and all of this work had to be done at night when trains were not running, which limited the number of hours that could be worked on each day and lengthened the construction period.

One way to solve these issues 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 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 amount of work required for installation.

Japanese Patent Application Laid-Open No. 2021-8724

The present invention was devised in light 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 for wall parapets such as H-shaped steel are used as supports for the protective fence, and that can absorb installation errors in the stud bolts attached to the supports and manufacturing errors in the panel materials.

The protective fence according to the first invention is a protective fence that separates a construction area from other areas. A frame made of vertical and horizontal members combined in a lattice pattern is attached to existing posts, and panel members are attached to the frame. Stud bolts are attached to at least two locations, the top and bottom, of the flanges of the posts, and the vertical members are attached to the stud bolts. The vertical members and the horizontal members are made of channel members with a U-shaped cross section and multiple connection holes on the closed surface. 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 connecting members of a specific shape. The panel material is fixed to any position on the open surface of the cross member via the connecting member, the channel member has an open groove with a folded piece on the open surface, the connecting member includes a fixing bracket with 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 fixed to any position in the open 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 tighten it.

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

The protective fence according to the third invention is the same as that according to the second invention, but is characterized in that the cross-member fixing brackets are fitted with cross-member support members with an L-shaped or J-shaped cross section on which the longitudinal ends of the cross members rest.

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

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. This means that even if there is an installation error in the stud bolt attached to the support or a manufacturing error in 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 loose from the channel member, resulting in a highly safe structure. Furthermore, when the fixing metal fittings are inserted into the open surface of the channel member of the vertical or horizontal member, they can be slid and fixed at any position, easily accommodating installation errors in the stud bolts and manufacturing errors in the panel.

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 posts. 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. However, with this invention, this can be achieved by installing stud bolts in at least two locations, one above and one below, on the support posts, thereby reducing the number of stud bolts that require time-consuming installation during on-site construction.

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. As a result, even if the number and positions of horizontal members change due to on-site conditions, the stud bolt installation work and vertical member installation work can be carried out mechanically, eliminating the need for positioning work and making installation extremely easy.

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 closing surface of the horizontal member, the hole position may not match the position of the vertical member, 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 closing surface of the horizontal member. Furthermore, the use of horizontal member fixing brackets can address cases where the spacing between existing posts is slightly different or there is a slight error in the length of the horizontal member.

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

In particular, according to the fourth invention, the stud bolts are fixed using a hammer-in welding method, which eliminates the need for a welding machine and allows construction even in rainy weather. Furthermore, when fixing the stud bolts using a hammer-in welding method, only a small pilot hole in the flange is required, and the work time is significantly shorter than with welding or screw-in methods. Furthermore, no sparks are generated, eliminating the need to be concerned about fire, making it easier to work on construction sites.

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

The following describes in detail the protective fence according to an embodiment of the present invention, with reference to the drawings.

[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 during renovation work 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, the guardrail according to the present invention is not limited to temporary guardrails, and can, of course, also be applied to permanent guardrails.

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

Here, an inverted L-shaped balustrade refers to a wall balustrade that has a cross-section shaped like an inverted L, with panels installed on the wall surface and the ceiling surface where they fold back, creating a soundproof wall that has the effect of reducing noise that crosses the soundproof wall.

As shown in Figures 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, with multiple layers of concrete (cement-based) panel material 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, with ceiling support steel members 15 spanning between the upper ends of the outer supports 12 and the upper ends of the inner supports 14, and panels 13 also installed on the ceiling surface.

As shown in Figures 1 to 6, the guardrail 1 according to this embodiment is a guardrail that uses the existing inner supports 14 of the inverted L-shaped railing 10 described above as its supports, has a lattice-shaped frame 2 attached to the inner supports 14, and has panel members 6 (described below) attached to the frame 2. This frame 2 is a frame that supports the guardrail 1, with vertical members 21 and horizontal members 22 combined in a lattice pattern. Furthermore, this guardrail 1 is installed along the track R1, and separates the track R1 from the construction area CA, preventing workers from entering the track R1 side or accidentally coming into contact with a train when moving around with materials, etc.

(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 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-channels, that has a flange for installing the stud bolts 3. Furthermore, the stud bolts 3 may be provided in four or more locations.

Here, driving welding differs from non-metal welding in that it refers to the process of using a driving machine (tack driver) or similar 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, forming a single unit and securing it. This pilot hole is drilled in advance into the flange surface of the existing inner support 14, slightly smaller in diameter than the base end 31 (described below) of the stud bolt 3, before driving it in.

Of course, the method of fastening the stud bolt 3 to the inner support column 14 is not limited to the hammer-in welding method; a screw-in 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. The stud bolt can also be welded to the inner support column 14 using a welding machine such as arc welding.

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

(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 is capable of screwing in the vertical member 21, and a base end portion 31 formed at one longitudinal end of the threaded portion 30 and having a diameter smaller than the diameter of the M10 bolt. Figure 9 is a side view of the stud bolt 3 as viewed perpendicular to its axis.

As shown in Figure 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 around the tip of the base end 31. This tapered surface 31a functions to guide the base end 31 when it is driven into the small-diameter pilot hole in the base end 31.

(Frame)
The frame 2 is made up of vertical members 21 and horizontal members 22 assembled in a lattice pattern via connecting members 5 (described later). In this embodiment, as shown in Figures 3 and 6, vertical members 21 are installed at both longitudinal ends of the horizontal members 22. In other words, six horizontal members 22 are joined orthogonally at predetermined intervals between two vertical members 21. 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.

(Channel member)
The vertical members 21 and the horizontal members 22 are both composed of channel members 4 having a U-shaped cross section. As shown in Fig. 10, this channel member 4 has 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 the opposite side of the open surface 41 is a closed surface 42. 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.

Connection holes are drilled in this closed surface 42 for connecting components to each other. As shown in Figure 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 has alternating elongated holes 43 and circular holes 44.

As shown in Figure 10(a), both edges of the opening groove 40 are formed with folded pieces 45 that fold back to form a U-shaped cross section. These folded pieces 45 fit into the fitting grooves of the fixing brackets 51 of the connecting member 5, which will be described later.

As shown in Figure 10(a), multiple circular holes 44 are drilled as connection holes on both side surfaces 46 of the channel member 4.

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

(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 horizontal members 22 (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.

(Connection 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 shape in front view, and a resin plate 52 made of resin that is fixed to the fixing bracket 51. Figure 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.

This fixing bracket 51 has a cylindrical threaded portion 53 with a central thread groove for mating with an M10 bolt, and its grooved edge 54 has four triangular mating grooves 55 formed therein that mate with the aforementioned folded piece 45.

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, and a fitting portion 58 that is continuous with the plate portion 56 and fits onto the outer periphery of the threaded portion 53.

The resin plate 52 is fixed to the fixing bracket 51 by caulking the edge 54 while the fitting portion 58 is fitted around the cylindrical threaded portion 53.

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

Therefore, when the twist lock channel nut 50 is inserted into the vertical member 21 through the open groove 40 of the vertical member 21, the open surface 41 of the vertical member 21 is brought into contact with the closed surface 42 of the horizontal member 22, and a bolt is inserted through 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, firmly fixing the horizontal member 22 at any position in the open groove 40 of the vertical member 21.

(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 in 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/ ^cm3 , and each panel material 6 weighs only 7200 g, making it easy to carry manually. Therefore, the panel material 6 can be installed without using a crane, resulting in extremely high work efficiency.

Of course, the panel material of the present invention is not limited to polycarbonate, and can also be metal folded plates or panels made of other resins. However, using transparent resin plates as the panel material allows the situation inside the track to be seen, makes it brighter as sunlight enters, is lightweight, easy to transport, and improves workability.

The number of horizontal members varies depending on the height of the panel material 6, and typically, four to eight horizontal members 22 are joined to one vertical member 21. Therefore, when directly fastening 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 (equivalent to the number of horizontal members 22) on the inner support posts 14 (eight to sixteen on both sides of the horizontal members). However, with the protective fence 1 according to this embodiment, the vertical members 21 are fastened above and below to the flange surfaces of the inner support posts 14, so only two stud bolts 3 are required for each vertical member 21. Because the installation of the stud bolts 3 is performed on-site, reducing the number of stud bolts can reduce construction labor and costs.

(reinforcement material)
6, 7, etc., the panel material 6 is attached to the frame 2 via a reinforcing material 7. Specifically, as shown in Figures 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.

As shown in Figures 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 described above to form the frame 2. Then, the twist-lock channel nut 50 is inserted into the horizontal member 22 through the open groove 40, 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, allowing the panel member 6, etc. to be secured at any position in the open groove 40 along the longitudinal direction of the horizontal member 22.

(Sealing material)
Furthermore, as shown in Figures 6 and 8, a sealing material 9 made of bent steel plate (high 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.

As shown in Figures 6 and 8, this plugging material 9 is bolted to a stud bolt 3 welded to the outer flange of the existing inner support column 14.

With the protective fence 1 according to the embodiment of the present invention described above, the joining of channel members 4, such as 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. This means that 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.

Furthermore, because panel heights typically exceed 2m, the panel 6 requires four to eight horizontal members 22 to withstand wind loads. When directly fastening the horizontal members 22 to existing posts via stud bolts 3, four to eight stud bolts 3 per horizontal member (eight to sixteen stud bolts on both sides of the horizontal member), corresponding to the number of horizontal members 22, must be installed on the existing posts. However, with the protective fence 1 of this embodiment, at least two stud bolts 3 are required to fasten the top and bottom 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 effort and costs involved in installing the entire protective fence 1.

Furthermore, the spacing of existing posts (such as the inner posts 14) in the track direction may vary depending on local conditions. As a result, the surface pressure due to wind loads varies depending on the spacing of the existing 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 directly fixing the cross members 22 to existing posts via stud bolts 3, it is necessary to position the stud bolts 3 each time depending on the spacing of the 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 at 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 of 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 posts 14, resulting in extremely easy construction.

Next, a protective fence 1' according to a second embodiment of the present invention will be described using Figures 12 to 17. The main difference between the protective fence 1' according to the second embodiment and the previously described protective fence 1 is that the horizontal members 22 are fixed to the vertical members 21 via horizontal member fixing brackets 23, so this point will be mainly described; identical components will be given the same reference numerals and will not be described again.

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

As shown in Figures 12 and 14, the frame 2' of the protective fence 1' is not constructed so that the horizontal members 22 are directly joined to the vertical members 21 with connecting members 5, but are instead fixed via horizontal member fixing brackets 23. These horizontal member fixing brackets 23, like the vertical members 21 and horizontal members 22, are made up of the aforementioned channel members 4.

Specifically, as shown in Figures 14 and 16, the closed surface 42 of the horizontal member fixing bracket 23 is positioned on the vertical member 21 side, and the open surface 41 is positioned on the horizontal member 22 side, and they are joined by a 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 positioned so as to abut against the closed surface 42 of the horizontal member 22, and the two are joined by the connecting member 5.

The length of the horizontal member fixing bracket 23 is 200 mm to 1000 mm. This is because the length of the portion where the horizontal member 22 overlaps the horizontal member fixing bracket 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 bracket 23, the length of the horizontal member fixing bracket 23 needs to be 200 mm or more.

In addition, 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 14 free. This makes the inner support 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'.

However, if the length of the cross member fixing bracket 23 exceeds 1000 mm, the disadvantage of increased cost outweighs the improvement in bending rigidity, so the length of the cross member fixing bracket 23 is preferably in the range of 200 mm to 1000 mm.

In addition, in the frame body 2' of the protective fence 1', a cross-member support 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 rests, and the cross-member fixing bracket 23 and the cross-member 22 are joined with a connecting member 5.

The horizontal member support member 24 is made of highly corrosion-resistant plated steel plate, and as shown in Figure 17, in the illustrated form, it is a J-shaped cross-section member with a predetermined length corresponding to the length of the horizontal member fixing bracket 23. The surface of the horizontal member support member 24 facing the vertical member 21 has multiple bolt holes 24a drilled therein for inserting the bolts B of the connecting member 5.

The horizontal member support member 24 is attached to the horizontal member fixing bracket 23 by inserting a bolt B into the bolt hole 24a and sandwiching it when the vertical member 21 and the horizontal member fixing bracket 23 are joined with the connecting member 5.

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 securely 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 existing inner supports 14 is slightly different or there is a slight error in the length of the horizontal members 22.

Furthermore, when fixing the cross member 22 to the cross member fixing bracket 23 with the connecting member 5, it is thought that this would require two people: 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 is possible to temporarily support the cross member 22.

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

The protective fences 1, 1' according to the embodiments have been described in detail above, but the embodiments described above and shown in the figures merely represent specific embodiments for carrying out the present invention. Therefore, the technical scope of the present invention should not be interpreted as being limited by the illustrated embodiments.

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 balustrade 10 erected along a dedicated viaduct over which high-speed trains such as the Shinkansen pass, but 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 that have a frame body made of a lattice-like combination of vertical and horizontal members attached to supports, and panel members 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.

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

Claims (4)

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 folding piece with the engaging groove, and tightening the engaging groove. 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 protective fence according to claim 1, wherein the horizontal members are attached so as to overlap the horizontal member fixing fittings in the longitudinal direction, thereby making the length of the horizontal members equal to or less than the interval between the posts. 3. The protective fence according to claim 2, wherein the cross-member fixing fittings are fitted with cross-member receiving members having an L-shaped or J-shaped cross section on which the longitudinal ends of the cross members are placed. The safety fence according to any one of claims 1 to 3, wherein the stud bolts are driven into and welded to flange surfaces of the posts.