Temporary placement structure of leaky coaxial cable for temporary protective fence and method for temporarily placing leaky coaxial cable for temporary protective fence

Abstract

To provide a temporary protective fence that does not block radio waves from a leakage coaxial cable, a leakage coaxial cable temporary placement structure of the temporary protective fence, and a leakage coaxial cable temporary placement method of the temporary protective fence.SOLUTION: In a temporary protective fence 1 which is installed along the track or road and divides the track or road from the construction area, a panel material 4 is made of radio wave permeable resin that transmits radio waves from a leakage coaxial cable Ca. The radio wave permeable resin constituting the panel material 4 is made of polycarbonate.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a temporary protective fence, a structure for temporarily installing a leaky coaxial cable of the temporary protective fence, and a method for temporarily installing the leaky coaxial cable of the temporary protective fence.

Background Art

[0002] Conventionally, construction work in places close to the track, such as repair and addition work on the parapet walls and attached structures of railway viaducts, especially construction work in the vicinity where high-speed trains such as the Shinkansen pass, has been carried out at night when trains do not pass because there is a risk of contact with the train. However, in the suburbs of large cities, the time when vehicles do not pass is only about 3 to 4 hours, and there has been a problem that the construction period is too long if the construction is carried out only at night.

[0003] Therefore, in order to prevent contact accidents with trains, it is required to demarcate the track and the construction area with a temporary protective wall such as a temporary enclosure and carry out construction even during the day when trains pass. In recent years in Japan, while the working population is decreasing, infrastructure facilities built in large quantities during the high-growth period are reaching the end of their service life and need to be renovated, and the number of renovation works is increasing. For this reason, further improvement in construction efficiency is required.

[0004] On the other hand, a conventional temporary enclosure was made by combining single-pipe pipes vertically and horizontally with clamps to create a framework, and fixing a panel made of a steel plate or the like to the framework. However, unlike a temporary enclosure at a general construction site, a sprinkler and a water conduit may be installed at the edge of the side path of the viaduct (for snow prevention). Since the diameter and height position of this water conduit vary depending on the location, variability to avoid interference is required for the holding posts of the temporary protective wall provided along the track.

[0005] Therefore, the applicants of the present application have proposed a temporary protective wall (temporary protective fence) described in Patent Document 1. The temporary protective wall described in Patent Document 1 is a temporary protective wall that demarcates the track section where the train runs and the construction area where renovation work is carried out. It includes a plurality of columns, a plurality of cross beams spanned across these columns, panel materials attached to these cross beams, and stay columns that are inclined and connected to the columns. The columns and the stay columns are configured to be connectable to any position of the saw blade via a connection member that meshes with the saw blade. Therefore, it is easy to install the stay column by avoiding obstacles such as water conduits with different diameters and height positions depending on the location in the temporary protective wall described in Patent Document 1.

[0006] However, a leaky coaxial cable (LCX cable) necessary for communication with the running Shinkansen is installed in the railing part of the viaduct where the Shinkansen etc. run. When installing a temporary protective fence for renovation work on the railing etc., the temporary protective fence is arranged on the track side of this LCX cable. At this time, the temporary protective fence is required to have a structure that does not block the radio waves radiated from the LCX cable. However, when a steel plate is used for the panel material of the temporary protective wall (temporary protective fence) described in Patent Document 1, it will block the radio waves, resulting in a problem that communication malfunctions occur.

[0007] In addition, in paragraph

[0042] of Patent Document 1, there is also a description of a transparent resin plate as the panel material. When a transparent resin plate is used as the panel material, there is a possibility that it may not block the radio waves from the LCX cable, but its specifications are not described at all and are not clear.

[0008] Moreover, when the Shinkansen etc. runs at high speed in a snow - covered area, the ice and snow adhering to the vehicles of the Shinkansen etc. may peel off and hit the temporary protective fence. However, in the temporary protective wall (temporary protective fence) described in Patent Document 1, when a transparent resin plate is used as the panel material, there is a possibility that the resin plate may not be able to withstand the impact force of the ice and snow.

[0009] In addition, in the renovation work of the guardrail, it is required to remove the LCX cable installed on the guardrail to be removed, repaired, or reinforced. However, since the LCX cable cannot be partially removed while in use, it is necessary to temporarily place the LCX cable on a temporary protective fence. However, in the conventional temporary protective fence, it is not considered that the cable can be temporarily placed without becoming an obstacle to the renovation work for a long period during the renovation work while using the LCX cable, and there is a problem that the cable relocation work is time-consuming and laborious.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0011] Therefore, the present invention has been devised in view of the above-described problems, and an object thereof is to provide a temporary protective fence that does not block radio waves from a leaky coaxial cable, a leaky coaxial cable temporary placement structure for a temporary protective fence, and a method for temporarily placing a leaky coaxial cable for a temporary protective fence.

Means for Solving the Problems

[0017] No. 1 The leaky coaxial cable temporary placement structure for a temporary protective fence according to the first aspect of the invention is a leaky coaxial cable temporary placement structure for a temporary protective fence that is installed along a track or a road and temporarily places an existing leaky coaxial cable on the temporary protective fence that demarcates the track or road and the construction area, wherein the panel material constituting the temporary protective fence is made of a radio wave transmissive resin, and a cable support is provided on the outer side opposite to the track side or the road side of the panel material.

[0018] No. 2 The leaky coaxial cable temporary placement structure for a temporary protective fence according to the second aspect of the invention is the same as the first 1In the invention, the temporary protective fence includes a plurality of columns, a plurality of cross beams spanned outside the opposite side of the track side or the road side of these columns, and the panel material attached to the outside of these cross beams. At the same time, from the inner side of the track side or the road side of the column to the outside of the panel material, a plurality of mounting brackets fixed to the column in a form straddling the upper part of the column and the panel material, a plurality of vertical bars fixed to these mounting brackets and hanging down, and a cable support for supporting the leaky coaxial cable fixed to these vertical bars. It is characterized by comprising these components.

[0019] No. 3 The leaky coaxial cable temporary placement structure of the temporary protective fence according to the invention is No. 2 In the invention, the lower part of the vertical bar is fixed to the cross beam via a bent connecting fitting, which is characterized by this.

[0020] No. 4 The leaky coaxial cable temporary placement structure of the temporary protective fence according to the invention is No. 3 In the invention, the connecting fitting has a substantially Z-shaped cross section, which is characterized by this.

[0021] No. 5 The leaky coaxial cable temporary placement structure of the temporary protective fence according to the invention is No. 2 In the invention or any of the inventions from No. 4 In any of the inventions, the mounting bracket has a substantially U-shaped cross section, which is characterized by this.

[0022] No. 6 The method for temporarily placing the leaky coaxial cable of the temporary protective fence according to the invention is as claimed in claim 2 or 5A method for temporarily installing a leaky coaxial cable on a temporary protective fence using the leaky coaxial cable temporary installation structure of the temporary protective fence according to any one of the preceding claims, comprising: a mounting bracket mounting step of arranging the mounting bracket so as to straddle the panel material and fixing one end disposed inside the mounting bracket to the upper part of the support column; a vertical bar installation step of fixing and installing the upper part of the vertical bar to the other end disposed outside the mounting bracket; a cable support installation step of fixing and installing the cable support to the vertical bar; and a cable transfer step of temporarily installing the existing leaky coaxial cable on the cable support.

[0023] No. 7 The method for temporarily installing a leaky coaxial cable on a temporary protective fence according to the invention is No. 6 In the invention, the leaky coaxial cable temporary installation structure of the temporary protective fence includes a connecting fitting having a substantially Z-shaped cross section, and in the vertical bar installation step, the lower part of the vertical bar is fixed to the cross beam via the connecting fitting.

Effect of the Invention

[0029] No. 1 Invention ~ No. 7 According to the invention, not only can a temporary protective fence that does not block radio waves from the leaky coaxial cable be installed, but also during construction such as the renovation of a guardrail, the existing leaky coaxial cable can be temporarily installed on the temporary protective fence continuously during the construction period without being cut and rearranged midway, and can be returned to its original position in order after the construction is completed. Therefore, the relocation work of the leaky coaxial cable can be carried out during the service period when trains such as the Shinkansen are running, and the work efficiency of the renovation work is extremely high.

[0030] In particular, according to the No. 3 invention, since the lower part of the vertical bar is fixed to the cross beam via the connecting fitting, even when vibrations during train running or impact forces due to flying snow from the train are applied to the panel material, the leaky coaxial cable can be stably supported, preventing the leaky coaxial cable from swaying and adversely affecting communication or breaking.

[0031] In particular, according to the No. 4The invention and the first 7 According to the invention, since the lower part of the vertical bar is fixed to the cross beam via a connecting fitting having a substantially Z-shaped cross section, the leaky coaxial cable can be supported more stably, and it is possible to prevent the leaky coaxial cable from wobbling or breaking.

[0032] In particular, according to the 5 invention, since the mounting fitting has a substantially U-shaped cross section, the mounting fitting can achieve the shape of straddling the upper part of the support column and the panel material at the shortest distance, and can have an inexpensive and simple configuration, and can support the panel material and the temporarily placed leaky coaxial cable more stably. Therefore, the impact resistance performance of the entire temporary protective fence with the leaky coaxial cable temporarily placed can be improved.

Brief Description of the Drawings

[0033]

Figure 1

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Figure 4

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Figure 6

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Figure 8

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Figure 10

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Figure 12

DETAILED DESCRIPTION OF THE INVENTION

[0034] Hereinafter, a temporary protective fence, a leakage coaxial cable temporary placement structure of the temporary protective fence, and a leakage coaxial cable temporary placement method of the temporary protective fence according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0035] <Temporary protective fence> [First Embodiment] First, with reference to FIGS. 1 to 5, the temporary protective fence 1 according to the first embodiment of the present invention will be described. Note that the temporary protective fence 1 according to the present embodiment is used as a temporary protective fence that divides a track and a construction area when performing repair work on a wall railing erected along a dedicated viaduct through which a high-speed train such as a Shinkansen passes. A case where it is used will be illustrated and described. FIG. 1 is a perspective view showing the temporary protective fence 1 according to the first embodiment of the present invention, and FIG. 2 is a front view of the temporary protective fence 1 according to the present embodiment as viewed from the outside (the railing side). Further, FIG. 3 is a right side view showing the temporary protective fence 1 of FIG. 2, FIG. 4 is a plan view showing the temporary protective fence 1 of FIG. 2, and FIG. 5 is a rear view showing the temporary protective fence 1 of FIG. 2.

[0036] As shown in FIGS. 1 to 5, the temporary protective fence 1 according to the present embodiment includes a plurality of columns 2, a plurality of cross beams 3 spanned over these columns 2, a panel material 4 attached to these cross beams 3, a brace column 5 that is inclined and connected to the column 2, and the like. As shown in FIG. 3, this temporary protective fence 1 is installed on a concrete structure C1 along the track, divides the track and the construction area, and has a function of preventing a worker from entering the track side or accidentally contacting a train when moving with materials or the like.

[0037] (Column) The support column 2 according to this embodiment is mainly composed of a channel made of a steel material with a substantially U-shaped cross-section that has been zinc-plated. Of course, it goes without saying that the support column according to the present invention is not limited to a channel, and may also be a square steel pipe or a circular steel pipe having a desired cross-sectional performance.

[0038] As shown in FIG. 4, this support column main body 20 is erected at a predetermined pitch P1. In the illustrated embodiment, P1 = 1500 mm (1.5 m), and the overall width W1 of the temporary protective fence 1 is 3000 mm (3 m).

[0039] (Cross beam) The cross beam 3 is mainly composed of a channel member made of a steel material with a substantially U-shaped cross-section that has been zinc-plated. Of course, it goes without saying that the cross beam according to the present invention is not limited to a channel member with a substantially U-shaped cross-section, and may also be a square steel pipe or a circular steel pipe having a desired cross-sectional performance.

[0040] (Panel material) The panel material 4 is made of a vertically long rectangular transparent resin plate. In this embodiment, it is formed of polycarbonate, the impact resistance performance of which is more than 250 times that of ordinary quartz glass. Of course, the panel material according to the present invention is not limited to polycarbonate, and it may be formed of a radio wave transmissive resin that transmits radio waves from a leaky coaxial cable.

[0041] Specifically, in addition to polycarbonate, radio wave transmissive resins such as ABS (acrylonitrile butadiene styrene), AES (acrylonitrile ethylene-propylene-diene styrene), etc., which are highly impact-resistant thermoplastic resins, are suitable. However, it goes without saying that any resin that can transmit radio waves from a leaky coaxial cable may be used.

[0042] In addition, the panel material 4 according to the present embodiment has a vertically long rectangular shape with a thickness T1 = 5 mm × a height H1 = 2000 mm × a width W2 = 500 mm. The density of the polycarbonate is 1.2 g / cm 3 and the weight of one sheet of the panel material 4 is as light as 6000 g, making it easy to carry by hand. Therefore, the panel material 4 can be installed without using a hoist, and the working efficiency is extremely good.

[0043] However, as described later, the thickness T1 of the resin plate of the panel material 4 made of a radio wave transmissive resin is preferably 5 mm to 10 mm from radio wave transmission experiments and ice block collision experiments. This is because if the thickness T1 of the resin plate of the panel material 4 is thicker than 10 mm, the radio wave transmission performance may deteriorate, which may cause problems during communication. Also, if the thickness T1 is thinner than 5 mm, the polycarbonate plate may crack when ice and snow hit it.

[0044] In addition, based on the average height of Japanese people, etc., the height of the temporary protective fence 1 is generally 2 m. Therefore, if the width W2, which is the length in the width direction of the panel material 4, is 1 m or less, even if the thickness having the desired impact resistance is 10 mm, the weight of one panel will be 25 kg or less, which is preferably within the weight that can be carried by a single worker by hand.

[0045] (Stay column) The stay column 5 is a diagonal member composed of a channel member 50 having the same configuration as the channel member of the beam body 30 described above, and a pair of tiltable jigs 51 fixed to both longitudinal ends of the channel member 50. One longitudinal end of this stay column 5 is fixed to the support column 2 via the tiltable jig 51 and has a function of resisting the horizontal force against the support column 2.

[0046] (Reinforcing member) Also, as shown in FIGS. 1 to 4, the aforementioned panel material 4 has a reinforcing member 6 made of an L-shaped angle of steel material and is joined to the aforementioned cross beam 3. Of course, the reinforcing member 6 is not limited to an L-shaped angle (equilateral angle steel, unequal-leg angle steel), and it may be channel steel or square steel pipe. In short, the reinforcing member according to the present invention may be any member having a rising piece 61 perpendicular to the panel surface of the panel material 4. This is because it has been found by the ice block collision experiment described later that by the plastic deformation such as buckling of the rising piece 61, the impact energy of the impact force of the ice block or the like can be absorbed, preventing the panel material 4 from being damaged.

[0047] As described above, when the plate thickness of the panel material 4 is 5 mm to 10 mm, the plate thickness of the reinforcing member 6 is preferably 1.0 mm to 3.2 mm, and the rising height of the rising piece 61 is desirably in the range of 15 mm to 40 mm. If it greatly deviates from this range, the energy absorption performance due to the plastic deformation of the reinforcing member 6 will decrease, and the possibility of the panel material 4 being damaged will increase.

[0048] <Function and effect of the temporary protective fence> According to the temporary protective fence 1 according to the first embodiment described above, since a radio wave transmissive resin such as polycarbonate is used for the panel material 4, the radio waves from the leaky coaxial cable are not blocked by the panel material 4, and there is no possibility of interfering with communication such as the Shinkansen.

[0049] Also, according to the temporary protective fence 1, since polycarbonate is used for the panel material 4, the impact resistance is improved, and it can withstand the impact force when the ice and snow falling from a high-speed train such as the Shinkansen collide with the panel material. In addition, polycarbonate has higher heat resistance, flame retardancy, and dimensional stability compared to other resins. Even when a fire occurs due to an accident or the like, not only can the safety of the workers be ensured, but also the shape does not change even after being installed for about 10 years, and it does not deteriorate even if the construction period is prolonged, and the safety can be continuously maintained.

[0050] In addition, according to the temporary protective fence 1, since the joint portion of the panel material 4 is reinforced by the reinforcing member 6 having the rising piece 61 orthogonal to the panel surface, even when an impact force of ice and snow falling from a high-speed train such as a Shinkansen is applied to the panel material 4, the rising piece of the reinforcing member plastically deforms to absorb the impact energy, and it is possible to prevent the panel material 4 from being damaged.

[0051] Furthermore, according to the temporary protective fence 1, the weight of a single panel material 4 can be set to 25 kg or less, which can be manually carried by one worker. Therefore, the installation work of the temporary protective fence 1 can be carried out without using a hoist, and the work efficiency of the installation work of the temporary protective fence 1 is improved.

[0052] <Temporary installation structure of leaky coaxial cable for temporary protective fence> Next, with reference to FIGS. 6 to 12, a temporary installation structure 10 of a leaky coaxial cable for a temporary protective fence according to an embodiment of the present invention (hereinafter, simply referred to as a leaky coaxial cable temporary installation structure 10) will be described. The leaky coaxial cable temporary installation structure 10 according to the present embodiment is a temporary installation structure for temporarily relocating an existing leaky coaxial cable Ca installed along an existing wall railing (not shown) to the temporary protective fence during the renovation work of the existing wall railing and returning it to its original position after the renovation work is completed. FIG. 6 is a front view of the leaky coaxial cable temporary installation structure 10 according to the present embodiment as viewed from the outside to the inside, and FIG. 7 is a right side view of the leaky coaxial cable temporary installation structure 10. FIG. 8 is an enlarged view of part A in FIG. 7, and FIG. 9 is an enlarged view of part B in FIG. 7.

[0053] Basically, the leaky coaxial cable temporary installation structure 10 is configured by providing the temporary protective fence 1 according to the first embodiment described above with mounting brackets 7, vertical bars 8, cable supports 9, connection fittings 11, etc., so that the leaky coaxial cable Ca can be temporarily installed. However, different from the temporary protective fence 1 described above, the reinforcing member 6 is provided inside the panel material 4 instead of outside the panel material 4.

[0054] Generally, for the temporary protective fence 1 used for renovation work of wall parapets, etc., the panel material 4 is installed on the outside of the support column 2 and the cross beam 3 so that the members do not protrude as much as possible into the narrow passage on the construction area side so as not to interfere with material transportation, etc.

[0055] And when trying to provide cable supports 9, etc. so that the leaky coaxial cable Ca can be hooked and installed on this temporary protective fence 1, if the reinforcing member 6 having the rising piece 61 is provided on the outside of the panel material 4, a dead space is created by the rising height of the rising piece 61, and the effective utilization of the space cannot be achieved. Also, if the rising piece 61 protrudes into the narrow passage on the construction area side, the rising piece 61 will hit the worker, causing problems in terms of safety.

[0056] Therefore, as shown in FIGS. 7 to 9, it was considered to provide the reinforcing member 6 having the above-mentioned rising piece 61 inside the panel material 4. This is because even if the reinforcing member 6 is provided inside the panel material 4, the rising piece 61 can absorb the above-mentioned impact energy by plastic deformation. However, if this is done, there will be no reinforcing member 6 in the direction in which the panel material 4 is pushed by the impact force, and stress may concentrate around mechanical joining means such as bolts and rivets that fix the panel material 4 to the cross beam 3, resulting in the panel material 4 being damaged.

[0057] Therefore, in the leaky coaxial cable temporary installation structure 10, while the reinforcing member 6 is provided inside the panel material 4, a flat bar 6' which is a flat steel material is provided on the outside of the opposite panel material 4. Thereby, even when the reinforcing member can only be provided inside (rail side), the flat bar 6' prevents stress due to the impact force from concentrating on the joint portion of the panel material 4, and the plastic deformation of the rising piece 61 of the reinforcing member 6 can absorb the impact energy to prevent the panel material from being damaged.

[0058] (Mounting fixture) Further, in the temporary leakage coaxial cable structure 10, as shown in FIG. 10, even if the support column 2 is not arranged outside the panel material 4, a cable support 9 for hanging the leakage coaxial cable Ca can be installed. An attachment fitting 7 is attached to the top of the support column 2 so as to bypass and support the upper part of the support column 2 and the panel material 4 in a shape that straddles them. FIG. 10 is a perspective view showing the attachment fitting 7 of the temporary leakage coaxial cable structure 10.

[0059] As shown in FIG. 10, this attachment fitting 7 is formed into a substantially U-shaped cross-section by bending a fitting body 70 made of a strip-shaped steel plate as a base. In this attachment fitting 7, the longitudinal end portions are folded downward around the upper side portion 7a of the fitting body 70, and an inner side portion 7b and an outer side portion 7c are formed.

[0060] Further, two bolt holes 71 for bolting the support column 2 and the vertical cross member 8 with bolts are formed in each of these inner side portion 7b and outer side portion 7c. This attachment fitting 7 is bolted to the top of the support column 2 through the bolt holes 71 in the inner side portion 7b, and bolted to the upper part of the vertical cross member 8 described later through the bolt holes 71 in the outer side portion 7c.

[0061] Although an attachment fitting 7 having a substantially U-shaped cross-section has been exemplified and described, the attachment fitting according to the present invention is not limited to a U-shaped one, and may have a shape that straddles the upper part of the support column 2 and the panel material 4 from the inside of the support column 2 to the outside of the panel material 4. However, by making it U-shaped, it can be connected from the inside of the support column 2 to the outside of the panel material 4 in the shortest distance, and can be made inexpensive with a simple structure.

[0062] (Vertical cross member) As shown in FIGS. 8 and 9, the vertical cross member 8 is made of a channel member. Of course, the vertical cross member according to the present invention is not limited to a channel, and can be made of a steel material having a desired cross-sectional performance such as other grooved steel or square steel pipe.

[0063] As shown in Fig. 8, the upper part of the vertical bar 8 is bolted to the outer side edge 7c of the aforementioned mounting bracket 7, so as to bypass and hang down across the upper part of the support column 2 and the panel material 4, and is supported by the support column 2. Further, as shown in Fig. 9, the lower part of the vertical bar 8 is bolted and supported by the cross beam 3 via the connecting fitting 11.

[0064] (Cable support) As shown in Figs. 7 and 9, the cable support 9 is a member with a substantially C-shaped inner peripheral surface corresponding to the outer diameter of the leaky coaxial cable Ca, and is composed of a C-shaped support body 90 and a plugging material 91 that can be screwed to the support body 90.

[0065] After placing the leaky coaxial cable Ca on the C-shaped support body 90 of this cable support 9, by screwing the plugging material 91 to the support body 90, it is possible to prevent the leaky coaxial cable Ca from falling off the cable support 9.

[0066] (Connecting fitting) As shown in Fig. 11, the connecting fitting 11 has a fitting body 110 made of a strip-shaped steel plate that is bent and formed into a substantially Z-shaped cross-section. As described above, this connecting fitting 11 has a function of fixing the lower part of the vertical bar 8 to the cross beam 3. Fig. 11 is a perspective view showing the connecting fitting 11 of the leaky coaxial cable temporary placement structure 10.

[0067] As shown in Fig. 11, bolt holes 111 for fixing to the lower part of the vertical bar 8 and long holes 112 for fixing to the cross beam 3 are formed in the fitting body 110 of this connecting fitting 11. In order to be able to adjust the position, this long hole 112 is a long hole that is long in the horizontal direction.

[0068] Although the connecting fitting 11 having a Z-shaped cross-section has been exemplified and described, the connecting fitting according to the present invention is not limited to the Z-shaped one, and any shape that can be connected to the cross beam 3 may be used.

[0069] (Modified example of cable support) Next, with reference to FIG. 12, the cable support 9' according to the modified example of the aforementioned cable support 9 will be described. FIG. 12 is an enlarged side view mainly showing the cable support 9' according to the modified example of the leaky coaxial cable temporary placement structure 10. As shown in FIG. 12, the cable support 9' according to the modified example is a clamp-type support in which a gripping piece 91' having a C-shaped cross-section is swingable with a hinge 92' on a support body 90' having a C-shaped cross-section, which is different from the C-shaped cross-section of the aforementioned cable support 9.

[0070] Further, in the cable support 9', the C-shaped gripping piece 91' is combined with the C-shaped support body 90' to form a circular closed shape according to the diameter of the leaky coaxial cable Ca, and the gripping piece 91' can be bolted to the support body 90'. Therefore, the cable support 9' is configured such that the leaky coaxial cable Ca is less likely to fall off compared to the aforementioned cable support 9.

[0071] <Temporary Placement Method of Leaky Coaxial Cable for Temporary Protection Fence> Next, with reference to FIGS. 6 to 12, the temporary placement method of the leaky coaxial cable for the temporary protection fence according to the embodiment of the present invention using the aforementioned leaky coaxial cable temporary placement structure 10 will be described.

[0072] (Temporary Protection Fence Installation Step) First, in the temporary placement method of the leaky coaxial cable for the temporary protection fence according to the present embodiment, a temporary protection fence installation step of installing the temporary protection fence is performed.

[0073] At this time, in the leaky coaxial cable temporary placement structure 10, as described above, different from the temporary protection fence 1, a reinforcing member 6 is provided inside the panel material 4, and a flat bar 6' which is a flat steel material is provided outside the opposite panel material 4.

[0074] (Mounting Bracket Mounting Step) Next, in the temporary placement method of the leaky coaxial cable for the temporary protection fence according to the present embodiment, as shown in FIGS. 7 and 8, a mounting bracket mounting step is performed in which the mounting bracket 7 is arranged so as to straddle the panel material 4, and one end inside the mounting bracket 7 is bolted and fixed to the upper part (top) of the support column 2.

[0075] (Vertical Rail Installation Process) Next, in the method for temporarily placing a leaky coaxial cable of the temporary protective fence according to this embodiment, as shown in FIGS. 7 and 8, a vertical rail installation process is performed in which the upper part of the vertical rail 8 is bolted and fixed to one end outside the mounting bracket 7.

[0076] Also, in this process, as shown in FIG. 9, the lower part of the vertical rail 8 is bolted and fixed to the cross beam 3 via the connection fitting 11. Thereby, the lower part of the vertical rail 8 can be firmly fixed, and the leaky coaxial cable Ca can be supported more stably, preventing the leaky coaxial cable Ca from swaying or breaking.

[0077] (Cable Support Installation Process) Next, in the method for temporarily placing a leaky coaxial cable of the temporary protective fence according to this embodiment, as shown in FIG. 9, a cable support installation process is performed in which the cable support 9 is fixed to the vertical rail 8 installed in the previous process.

[0078] (Cable Relocation Process) Next, in the method for temporarily placing a leaky coaxial cable of the temporary protective fence according to this embodiment, the member that has fixed the leaky coaxial cable Ca is removed from the existing guardrail, and a cable relocation process is performed in which the existing leaky coaxial cable Ca is placed and temporarily placed on the cable support 9.

[0079] After that, in the method for temporarily placing a leaky coaxial cable of the temporary protective fence according to this embodiment, after the renovation work of the wall guardrail is completed, the leaky coaxial cable Ca is returned to the renovated wall guardrail for restoration.

[0080] According to the leakage coaxial cable temporary installation structure 10 of the temporary protective fence according to the embodiment of the present invention and the leakage coaxial cable temporary installation method of the temporary protective fence according to the embodiment of the present invention described above, during the renovation work, without cutting and replacing the existing leakage coaxial cable Ca halfway, it can be temporarily installed on the temporary protective fence 1 continuously during the construction period and restored in order after the construction is completed. Therefore, the relocation work of the leakage coaxial cable Ca can be carried out during the operation period when trains such as the Shinkansen are running, and the work efficiency of the renovation work is extremely high.

[0081] Also, according to the leakage coaxial cable temporary installation structure 10 and the leakage coaxial cable temporary installation method, since the lower part of the vertical bar 8 is fixed to the cross beam 3 via the connecting fitting 11, even when vibrations caused by train running or impact forces caused by flying snow from the train are applied to the panel material 4, the leakage coaxial cable Ca can be stably supported, and it can be prevented that the leakage coaxial cable Ca sways or breaks.

[0082] [Radio wave transmission experiment] In this experiment, radio waves were transmitted from the leakage coaxial cable, the thickness of the panel material was changed step by step, and received by a receiver separated by the panel material, and it was determined whether there was any problem. Through this experiment, it was found that when the thickness T1 of the resin plate of the panel material 4 exceeds 10 mm, the radio wave transmission performance deteriorates and there may be problems during communication.

[0083] [Ice block collision experiment] In this experiment, an ice block weighing 1 kg was collided with a temporary protective fence similar to the aforementioned temporary protective fence 1 at a speed of 360 km / h, and the material and thickness of the panel material were changed step by step, and it was visually confirmed whether the panel material was damaged. Through this experiment, it was found that when the thickness T1 is less than 5 mm, the polycarbonate plate may crack when hit by ice and snow.

[0084] The above has described in detail the temporary protective fence 1, the leaky coaxial cable temporary placement structure 10, and the leaky coaxial cable temporary placement method according to the embodiments of the present invention. However, any of the above-described or illustrated embodiments merely shows one embodiment embodied in implementing the present invention, and the technical scope of the present invention should not be limitedly interpreted by the illustrated embodiments.

[0085] In particular, as the place for installing the temporary protective fence 1, a dedicated viaduct through which high-speed trains pass has been exemplified and described. However, it is not limited to dedicated viaducts for trains and can also be applied to highways and general roads. Further, the present invention is not limited to the construction target, such as guardrails, ground coverings, and drainage ditches. Also, regarding the construction content, in addition to renovation work involving removal and reconstruction, repair work for repairing cracks in concrete, reinforcement work for strengthening weak parts, etc., the content is not limited either.

Explanation of Signs

[0086] 1: Temporary protective fence 2: Support column 20: Support column body 3: Cross beam 30: Beam body 4: Panel material 5: Brace column 50: Channel member 51: Tiltable jig 6: Reinforcement member 61: Upright piece 6’: Flat bar (flat steel) 7: Mounting fitting 70: Fitting body 71: Bolt hole 7a: Upper side part 7b: Inner side part 7c: Outer side part 8: Vertical bar 9,9’: Cable support 90,90’: Support body 91: Plugging material 91’: Gripping piece 92’: Hinge 10: Leaky coaxial cable temporary placement structure 11: Connecting fitting 110: Fitting body 111: Bolt hole 112: Elongated hole C1: Concrete structure Ca: Leaky coaxial cable (LCX cable)

Claims

1. A structure for temporarily installing an existing leaky coaxial cable on a temporary protective fence that is installed along a track or a road and demarcates the track or road and the construction area, wherein the panel material constituting the temporary protective fence is made of a radio wave transmissive resin, and a cable support is provided on the outer side opposite to the track side or the road side of the panel material. A structure for temporarily installing a leaky coaxial cable on a temporary protective fence, characterized by the above.

2. The temporary protective fence includes a plurality of columns, a plurality of cross beams spanned on the outer side opposite to the track side or the road side of these columns, and the panel material attached to the outer side of these cross beams. A plurality of mounting brackets fixed to the columns in a manner straddling the upper sides of the columns from the inner side of the columns on the track side or the road side to the outer side of the panel material, a plurality of vertical bars fixed to these mounting brackets and hanging down, and a cable support fixed to these vertical bars and supporting the leaky coaxial cable. A structure for temporarily installing a leaky coaxial cable on a temporary protective fence according to Claim 1, characterized by the above.

3. The lower part of the vertical bar is fixed to the cross beam via a bent connecting fitting. A structure for temporarily installing a leaky coaxial cable on a temporary protective fence according to Claim 2, characterized by the above.

4. The connecting fitting has a substantially Z-shaped cross section. A structure for temporarily installing a leaky coaxial cable on a temporary protective fence according to Claim 3, characterized by the above.

5. The mounting bracket has a substantially U-shaped cross section. A structure for temporarily installing a leaky coaxial cable on a temporary protective fence according to any one of Claims 2 to 4, characterized by the above.

6. A method for temporarily installing an existing leaky coaxial cable on a temporary protective fence using the structure for temporarily installing a leaky coaxial cable on a temporary protective fence according to any one of Claims 2 to 5, including a mounting bracket mounting step of arranging the mounting bracket in a manner straddling the panel material and fixing one end arranged inside the mounting bracket to the upper part of the column, a vertical bar installation step of fixing and installing the upper part of the vertical bar to the other end arranged outside the mounting bracket, a cable support installation step of fixing and installing the cable support to the vertical bar, and a cable relocation step of temporarily installing the existing leaky coaxial cable on the cable support. A method for temporarily installing a leaky coaxial cable on a temporary protective fence, characterized by the above.

7. The structure for temporarily installing a leaky coaxial cable on the temporary protective fence includes a connecting fitting with a substantially Z-shaped cross section. In the vertical bar installation process, the lower part of the vertical bar is fixed to the cross beam via the connecting fitting A method for temporarily placing a leaky coaxial cable of a temporary protective fence according to claim 6, characterized by the above.

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