Temporary guard fence and method for installing temporary guard fence

Abstract

To provide a temporary guard fence for a road capable of making a lateral width narrower than 300 mm, thereby ensuring a sufficient width of a traveling vehicle lane in the case of construction on one side of the road.SOLUTION: A temporary protective fence comprises: a long base member (11) having a pair of flanges facing upward and placed on the ground; and a barricade body (12) having a lower end part inserted between the pair of flanges of the base member and forming an inverted V-shape in a side view, wherein the barricade body comprises attention calling panels (12A, 12B, 22D) each on which a reflective sheet (12c) is affixed or a reflective layer is applied onto a surface, an opening degree of a pair of leg parts in a side view is constituted as adjustable by a hinge (12C) provided on an upper part, and the hinge (12C) is provided on an upper part where an interval holding member (13) for holding an interval between the pair of leg parts is arranged between the pair of leg parts so that a lateral interval of the pair of leg parts formed in a side view can be adjusted.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a temporary protective fence and a method for installing the temporary protective fence to temporarily separate a no-vehicle area from an area where vehicles are allowed to travel at road construction sites and the like, and relates to a temporary protective fence and a method for installing the temporary protective fence that are effective for use in sections where construction work is being carried out on one side of a highway tunnel, for example. [Background technology]

[0002] When road repair work is carried out, the road is divided into a no-vehicle zone and a vehicular zone where general vehicles are allowed, and temporary protective fences such as traffic cones (registered trademark) and construction barricades are installed at the boundaries between the two zones. Examples of temporary protective fences include H-beam guardrails, which are made by integrating H-beams and guardrails (see Patent Document 1), H-beam guard fences, which are made by fixing a net fence to an H-beam, and movable steel temporary protective fences equipped with casters (see Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-155716 [Patent Document 2] Japanese Patent Publication No. 2022-186551 Summary of the Invention [Problem to be solved by the invention]

[0004] When carrying out construction on one side of a road, a temporary protective fence is installed in the center of the road, but when installing the temporary protective fence, it is necessary to ensure the width of the vehicle driving area (driving lane).However, when carrying out half-section construction inside a tunnel where it is difficult to temporarily expand the road width, the temporary protective fence described in Patent Document 1 and the movable steel temporary protective fence described in Patent Document 2 are too wide to ensure a sufficient width for the driving lane.

[0005] In addition, in the invention of the H-beam guardrail described in Patent Document 1, a heavy metal guardrail is attached on top of the H-beam as a base member of the protective fence, so the width of the H-beam needs to be at least 300 mm in order to avoid compromising the weight balance. Furthermore, the movable steel temporary protective fence described in Patent Document 2 is commercially available under the name "Vulcan Barrier," and the actual dimensions of the product are 560 mm wide and 850 mm high.

[0006] Furthermore, the temporary protective fence described in Patent Document 1 has the problem that the H-shaped steel and the guardrail are connected by multiple bolts, making it tedious to attach the guardrail posts to the H-shaped steel and assemble the guardrail. In addition, because the guardrail is made of heavy metal, it is difficult for a small number of workers to install it, requiring a lot of manpower and time for installation, which increases installation costs.

[0007] To prevent the fence from falling over, the top end is connected to the top of the fence and the bottom end is supported by support pipes connected to H-beams, but this requires the installation of support pipes, which takes time.In addition, heavy machinery is required to install H-beams as the foundation material for the protective fence. Therefore, when constructing a half-section in a tunnel where the road is narrow, it is common to carry out construction near the center of the road with color cones (registered trademark) placed at regular intervals, but this poses the problem of frequent accidents in which ordinary vehicles come into contact with the color cones during construction.

[0008] The present invention has been made with an eye on the above-mentioned problems, and aims to provide a temporary protective fence whose width can be made narrower than 300 mm, thereby ensuring a sufficient width for vehicle lanes when construction is carried out on one side of a road. Another object of the present invention is to provide a method for installing a temporary protective fence that can install a temporary protective fence equipped with heavy foundation members without using heavy machinery and that does not interfere with the movement of construction vehicles in the no-vehicle zone. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention provides: a long foundation member having a pair of upward flanges and placed on the ground; A temporary protective fence comprising: a barricade body having an inverted V shape in a side view, the lower end of which is inserted between the pair of flanges of the foundation member; The barricade body is provided with a warning panel having a reflective sheet attached or a reflective layer applied to its surface, and is configured so that the opening degree of the pair of legs in a side view can be adjusted by a hinge provided at the top, A spacing member is disposed between the pair of legs to maintain the spacing between the legs.

[0010] With a temporary protective fence having the above-described configuration, the maximum width of the temporary protective fence is determined by the width of the foundation member. Therefore, if, for example, H-shaped steel or earth retaining material with a width smaller than 300 mm is used as the foundation member, the width can be made narrower than 300 mm, thereby ensuring a sufficient width for vehicle lanes when construction is carried out on one side of the road. In addition, since the temporary protective fence is equipped with a warning panel with a reflective sheet or a reflective layer applied to its surface, it can improve the visibility of the temporary protective fence installed in the construction area and prevent ordinary vehicles traveling in the driving area separated by the temporary protective fence from coming into contact with the fence.

[0011] The method for installing a temporary protective fence according to the present application comprises the steps of: A method for installing a temporary protective fence having the above-described configuration in a road construction area using a dedicated cart with casters, comprising: the carriage includes a pair of arm members provided at the front and rear of the carriage and extending laterally, chain blocks provided on each of the pair of arm members and capable of raising and lowering the base member, and a gripping means extended on the side of the carriage opposite to the extension side of the arm members, a transport preparation step in which the dolly is positioned to the side of the temporary protective fence or foundation member to be transported, and a heavy object having casters and a stepped surface portion is positioned on the side of the dolly opposite to the side where the temporary protective fence or foundation member is located; a gripping step of gripping the surface step portion of the heavy object with the gripping means; a lifting step of clamping a part of the foundation member with a clamper at the tip of the chain of the chain block to lift the temporary protective fence or the foundation member; a transport step of moving the dolly with the temporary protective fence or foundation member hoisted and the heavy object to a predetermined position; an installation process in which the temporary protective fence or the foundation member is lowered onto a road while a part of the foundation member is clamped by the chain block, and the clamping of the foundation member by the clamper is released; a release step of releasing the grip of the surface step portion of the heavy object by the gripping means; and a separating step of separating the carriage and the heavy object from the installation location of the temporary protective fence or foundation member.

[0012] According to the above installation method, the cart is equipped with casters and a chain block that can raise and lower the foundation member, and a heavy object with casters is placed on the side opposite the chain block and held in place with a clamp to maintain weight balance, so that a temporary protective fence with a heavy foundation member can be installed without using heavy machinery. In addition, by using existing movable steel temporary protective fences as heavy objects with casters, the height of the heavy objects can be reduced, so that they do not interfere with the movement of construction vehicles in the no-vehicle zone. [Effects of the Invention]

[0013] The temporary protective fence of the present invention has the advantage that its width can be made narrower than 300 mm, thereby ensuring a sufficient width for vehicle lanes when construction is carried out on one side of a road.Furthermore, the temporary protective fence installation method of the present invention has the advantage that a temporary protective fence equipped with heavy protective fence foundation members can be installed without using heavy machinery, and that the movement of construction vehicles in the no-vehicle zone is not hindered. [Brief explanation of the drawings]

[0014] [Figure 1] 1A and 1B show an embodiment of a temporary protective fence according to the present invention, in which (A) is a front view and (B) is a side view. [Figure 2] FIG. 1 is a perspective view showing an example of a barricade body that constitutes the temporary protective fence of an embodiment. [Figure 3] FIG. 10 is a perspective view showing another example of a barricade body that constitutes the temporary protective fence of the embodiment. [Figure 4] 1A and 1B show an example of a cart used to set up a temporary protective fence according to an embodiment, in which (A) is a front view and (B) is a plan view. [Figure 5] FIG. 5 is a side view showing the installation of the temporary protective fence of the embodiment using the dolly shown in FIG. 4. [Figure 6] FIG. 10 is a side view showing the process of installing the temporary protective fence of the embodiment at a construction site inside a tunnel. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of a temporary protective fence according to the present invention and a method for installing the same will be described in detail with reference to the drawings. Some temporary protective fences have the functions of dividing roads into no-vehicle zones and vehicle-operated zones, and of preventing vehicles from deviating from their lanes and restoring them to their normal trajectory. However, the temporary protective fence of this embodiment is primarily intended for use in construction work sections within tunnels, and since vehicle speeds are restricted in construction work sections within tunnels, this protective fence was developed with an emphasis on the dividing function of the two functions mentioned above.

[0016] FIG. 1 shows a temporary protective fence according to an embodiment of the present invention, where (A) is a front view and (B) is a left side view. 1(A) and 1(B), the temporary protective fence 10 of this embodiment comprises a long base member 11 arranged along the boundary between a no-vehicle zone and a vehicle-operated zone, a barricade body 12 having two plastic panels 12A and 12B placed on the base member 11, and a camber 13 that determines the opening angle of the two panels 12A and 12B that make up the barricade body 12. The base member 11 may be long enough to accommodate one barricade body 12, or it may be long enough to accommodate multiple (for example, two) barricade bodies 12.

[0017] Although not particularly limited, in this embodiment, the camber 13 is made of wood from the viewpoint of cost and ease of handling. This embodiment also uses weights 14, which are sandbags or trapezoidal containers filled with sand, placed on the webs 11A of the foundation members 11. Using the weights 14 can increase the stability of the temporary protective fence 10, making it less likely for the temporary protective fence 10 to tip over even if the barricade body 12 is exposed to a crosswind.

[0018] The foundation members 11 are preferably made of a heavy material such as steel so that the temporary protective fence 10 does not easily move, and so in this embodiment, steel earth retaining members are used. Earth retaining members are used to prevent excavated ground from collapsing due to earth pressure or water pressure in civil engineering and construction foundation work, and since those made by processing H-shaped steel are commercially available, these are used. H-shaped steel may also be used for the foundation members 11 instead of steel earth retaining members. Although not particularly limited, the earth retaining material or H-shaped steel used in this embodiment is 200 mm wide. The earth retaining material used has an H-shaped cross section and is equipped with closing plates at both ends to close the openings, with multiple holes several millimeters in diameter formed in a row at specified intervals in the closing plates and the flange of the main body.

[0019] As shown in Fig. 2, the barricade 12 is configured with two panels 12A and 12B that can be opened and closed by a hinge 12C attached to the upper end. The two panels 12A and 12B are formed with a plurality of openings 12a and 12b to allow crosswinds to escape, and a reflective sheet 12c is attached to the upper flat portion to improve visibility. The lower edges of the panels 12A and 12B are formed with a plurality of notches 12d corresponding to the openings 12a and 12b, with the spaces between the notches 12d forming the legs of the barricade 12. A barricade 12 having this configuration is available, for example, from Sendai Meiban Co., Ltd., under the product name "Neo Super Barrier," and this was used.

[0020] The "Neo Super Bali" manufactured by Sendai Meiban has parallelogram-shaped gold and silver reflective sheets alternately attached as reflective sheet 12c, and the surface color of panel 12A is red and the surface color of panel 12B is white. The height of the two panels 12A and 12B is 800 mm, the width is 1200 mm, and the hinge 12C is configured so that the bottom end can open up to 450 mm. When constructing the temporary protective fence 10 of this embodiment by lining up multiple barricades 12 and placing them on the base member 11, it is desirable to set the orientation of each barricade 12 so that the red panels 12A and white panels 12B appear alternately on one side. This improves the visibility of the temporary protective fence 10. Furthermore, because the barricades 12 have a symmetrical, reversible structure, they can be left in place in the center of the road when changing lanes. Unlike temporary guardrails, there is no need to remove and reinstall them when changing lanes, which has the advantage of reducing dangerous work in the center of the road.

[0021] Furthermore, in the temporary protective fence 10 of this embodiment, the lower ends of the two panels 12A, 12B are spread apart to just under 200 mm, and the lower ends of the panels 12A, 12B are inserted between a pair of flanges of an earth retaining material serving as the foundation member 11, standing them up in an inverted V-shape when viewed from the side. A camber 13 is inserted between the lower parts of the two panels 12A, 12B, thereby defining the opening of the panels 12A, 12B. Furthermore, although not shown, PP bands, cable ties, binding wires, etc. may be inserted through the openings 12a, 12b of the panels 12A, 12B and the holes provided in the flanges of the retaining wall material to tie and secure the lower parts of the panels 12A, 12B to the foundation member (retaining wall material) 11.

[0022] With the temporary protective fence 10 configured as described above, the width of the barricade body 12 is smaller than the width of the foundation member 11, and the width of the foundation member (retaining material) 11 can be made narrower than the width of conventional temporary protective fences (minimum 300 mm).Therefore, even when the temporary protective fence 10 is installed during construction on one side of the road, a sufficient width can be secured for the lane for traveling vehicles. Furthermore, the two panels 12A and 12B that make up the barricade body 12 have multiple openings 12a and 12b formed in them, allowing crosswinds to escape, and weights 14 placed on the base member 11 prevent the barricade body 12 from tipping over due to the wind. Specifically, structural calculations confirmed that the barricade body 12 can stand on its own in wind speeds up to 15 m / s.

[0023] Furthermore, since the reflective sheet 12c is attached over a relatively wide area on the surface of the barricade body 12, the visibility of the temporary protective fence 10 is improved, and drivers of ordinary vehicles traveling in the driving area partitioned by the temporary protective fence 10 are alerted, thereby helping to avoid contact. In addition, to improve visibility from the front of the construction area, a reflector or lamp may be provided, which may have a holder that can engage with the top of the barricade body 12 (the upper end of the panel or the hinge pin) or a crystal-cut reflector with a clip that can clamp the top.

[0024] 2, an A-type barricade 22 having a relatively simple structure, as shown in Fig. 3, may be used, which is made up of one horizontal pipe 22A, four leg pipes 22B supporting the horizontal pipe 22A, two connecting pipes 22C connecting the lower ends of the two front and rear leg pipes 22B, and one panel 22D hanging down from the horizontal pipe 22A and coated on its surface with a layer of paint that displays a yellow and black diagonal striped pattern as a warning. Here, the A-type barricade 22 used in the temporary protective fence 10 of this embodiment is preferably equipped with a hinge at the top, so that the pair of leg pipes 22B connected by the connecting pipe 22C can move towards and away from each other.

[0025] Next, the configuration of the transport vehicle used to install the temporary protective fence 10 configured as described above at a road construction site, and the method for installing the temporary protective fence 10 using this vehicle and a steel temporary protective fence, will be described with reference to Figures 4 to 6. Figures 4(A) and 4(B) are a front view and a plan view showing the configuration of the transport vehicle 30, Figure 5 is a side view showing the configuration of the transport vehicle 30 and how the foundation member 11 is lifted, and Figure 6 is a view showing the temporary protective fence 10 installed in the center of the road inside a tunnel.

[0026] As shown in Figures 4(A) and (B), the transport cart 30 used to transport the temporary protective fence 10 of this embodiment has a configuration similar to that of mobile scaffolding used for exterior construction work on buildings, etc., in that it is made up of multiple pipes assembled to form a box shape and casters 32 attached to the bottom ends of the support pipes 31A at the four corners. Specifically, the ends of an upper horizontal / upper connecting pipe 31B, which connects the supports horizontally, and two upper vertical / horizontal connecting pipes 31C, 31C, which connect the supports vertically, are joined to the upper ends of the four support pipes 31A by welding, etc. Also, the ends of a lower horizontal / lower connecting pipe 31D, which connects the supports horizontally, are joined to the lower parts of the four support pipes 31A by welding, etc.

[0027] Furthermore, a reinforcing pipe 31E is disposed diagonally between the two front and rear support pipes 31A in an X-shaped configuration, and the end of the reinforcing pipe 31E is connected to the support pipe 31A with a connecting pin. Furthermore, the end of one intermediate vertical / horizontal pipe 31F that connects the support pipes is connected to the middle of the two support pipes 31A closest to the center (the lower side in Figure 4(B)) of the four support pipes 31A with a single-pipe orthogonal clamp or the like. At the same time, two intermediate horizontal / vertical pipes 31G disposed horizontally are connected to the support pipe 31A at the middle of the height direction of the four support pipes 31A with single-pipe orthogonal clamps 33 (see Figure 5), and the length of these intermediate horizontal / horizontal pipes 31G is set so that they extend outward in the horizontal direction of the support.

[0028] Similarly, two upper horizontal pipes 31H arranged laterally are connected to the upper ends of the four support pipes 31A by single-pipe orthogonal clamps 33 or the like, and the length of these upper horizontal pipes 31H is set so that they extend outward in the lateral direction of the support. A support pipe 31I is arranged between these upper horizontal pipes 31H and the support pipes 31A and is connected by welding or the like.

[0029] Furthermore, an upper vertical / horizontal pipe 31C is arranged between the two upper horizontal pipes 31H that protrude outward and is connected by a single-pipe orthogonal clamp or the like, and chain blocks 34 with pulleys are suspended from both ends of this upper vertical / horizontal pipe 31C. This chain block 34 is equipped with a screw-type clamp 34b at the end of a chain 34a, and is configured so that it can be lifted by clamping the flange of the earth retaining material of the foundation member 11 with the screw-type clamp 34b. At this time, by engaging the clamp 34b with a hole in the flange of the earth retaining material, the earth retaining material can be gripped more securely.

[0030] Two diagonal reinforcing pipes 31J are disposed between the lower end of the support pipe 31A on the side where the block chain 34 is disposed and the tip of the upper horizontal pipe 31H, with their ends fixed to the corresponding pipes (see Figure 5). Furthermore, a vertical pipe 31K is connected to the tip (left side in Figure 5) of the middle horizontal pipe 31G and the upper horizontal pipe 31H by a single-pipe orthogonal clamp 33 or the like. The lower end of this pipe 31K extends to near the height of the axis of the caster 32, and can function as a lateral vibration suppression means for suppressing lateral vibration of the earth retaining material (11) lifted by the chain block 34.

[0031] Furthermore, since the transport cart 30 of this embodiment is configured to hoist the earth retaining material using the chain block 34 at a laterally protruding position as described above, if left as is, the weight balance will be lost and the cart will tip over sideways. Therefore, as shown in Figure 5, the movable steel temporary protective fence 40 described in Patent Document 2 mentioned above is placed on the side opposite the side where the chain block 34 is located (the right side in the figure), and two horizontal pipes 31L, 31L are connected to the protruding portion on the opposite side of the intermediate horizontal pipe 31G using a single-pipe orthogonal clamp or the like, and multiple (e.g., six) screw clamps 35 are attached to these horizontal pipes 31L, 31L facing downward, and the screw clamps 35 clamp the steps on the upper left and right sides of the movable steel temporary protective fence 40, respectively, to generate a reaction force when the earth retaining material is hoisted.

[0032] The movable temporary steel protective fence 40 has a steel main body with casters at the bottom, and is provided with side panels on both sides of the main body made of steel that has been bent at multiple horizontal bending lines to form a corrugated cross section with alternating horizontally continuous convex and concave portions, and the corrugated shape of the side panels forms steps that can be grasped by the screw clamps 35 of the transport cart 30. When the transport cart 30 of the above embodiment is used side by side at the boundary between the general travel lane and the construction area, such temporary steel protective fence 40 is sometimes installed as a safety measure at the starting point, and is transported to the site before construction begins, so that it can be used effectively to avoid increases in costs.

[0033] Next, a procedure for transporting and setting up the temporary protective fence 10 of this embodiment using the transport cart 30 and the movable steel temporary protective fence 40 will be described. When transporting the temporary protective fence 10, first, the transport cart 30 is moved next to the temporary protective fence 10 to be transported so that the front and rear casters 32 are parallel to the foundation members (earth retaining members) 11 of the temporary protective fence 10. Next, the movable steel temporary protective fence 40 is moved to the opposite side of the transport cart 30.

[0034] Next, screw clamp 35 attached to transport cart 30 clamps the step or the like at the top of movable steel temporary protective fence 40, and chain 34a of chain block 34 is operated to lower screw clamp 34b at the tip, causing screw clamp 34b to clamp the flange of foundation member (earth retaining material) 11 of temporary protective fence 10. Next, the chain is operated to raise screw clamp 34b at the tip, hoisting temporary protective fence 10 to a predetermined height (for example, about 10 cm). Then, in this state, multiple workers push transport cart 30 and movable temporary protective fence 40 to a predetermined position at the construction site (near the center line of the road).

[0035] Then, in the reverse order of the above, first the chain of chain block 34 is operated to lower screw clamp 34b at its tip, and temporary protective fence 10 is lowered to a predetermined position on the road, after which screw clamp 34b is loosened to remove it from the flange of foundation member (earth retaining material) 11 of temporary protective fence 10, and screw clamp 35 is loosened to remove it from the top of temporary steel protective fence 40. Then, the movable steel temporary protective fence 40, which is no longer needed, is moved next to the next temporary protective fence 10 to be transported. By repeating the above steps, it is possible to install multiple temporary protective fences 10 in a row over a predetermined area. The same procedure as above can also be followed when removing the temporary protective fence 10 from the construction area.

[0036] Fig. 6 shows the state of the temporary protective fence 10 of this embodiment immediately after it has been set up at a construction site inside a tunnel using the procedure described above. In the transportation method described above, in addition to the transport cart 30, a movable temporary steel protective fence 40 is used, but the movable temporary steel protective fence 40 is small, measuring only 56 cm in width and 85 cm in height, and therefore, depending on the size of the tunnel to be constructed and the structure of the road shoulder, as shown in Fig. 6, it may be possible to prevent construction vehicles such as dump trucks used for construction work from passing by (passing beside the temporary steel protective fence 40) in the construction zone on the right, where general vehicles are prohibited from traveling.

[0037] In the above explanation, the temporary protective fence 10 is transported in an assembled state, but it is also possible to first transport the foundation member (earth retaining material) 11 to the construction site, and then place the barricade body 12, which has been transported separately, on the foundation member (earth retaining material) 11 at the construction site, and then install the camber 13 and weight 14 to assemble the temporary protective fence 10. In addition, when the construction area is long and many temporary protective fences 10 are to be installed, color cones (registered trademark) may be placed with small gaps between each set of temporary protective fences 10 (for example, two) to improve the visibility of the entire protective fence.

[0038] While the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments and can be modified as appropriate. For example, in the above embodiment, when installing the temporary protective fence 10 using the transport cart 30 shown in Fig. 4, an existing steel temporary protective fence 40 is used to prevent the cart from tipping over due to weight balance, but a heavy object with casters may be used instead of the steel temporary protective fence 40.

[0039] In addition, in the above embodiment, an example was shown in which a retaining wall material with the same cross section as an H-shaped steel beam was used as the foundation member 11 that constitutes the temporary protective fence 10, but the foundation member 11 can be any long member that has a flange and is somewhat heavy, so it can also be, for example, a steel member with an upward U-shaped cross section. Furthermore, in the above embodiment, the present invention has been described as being applied to a temporary protective fence and a method for installing the temporary protective fence at a construction site inside a tunnel, but the present invention can also be used in a temporary protective fence and a method for installing the temporary protective fence that temporarily divides a road with a limited width, such as a road on a bridge, into a no-vehicle area and a vehicle-operated area where vehicles can travel. [Explanation of symbols]

[0040] 10 Temporary protective fence 11 Foundation members (earth retaining materials) 12 Barricade 12A, 12B panels 12a,12b opening 12c Reflective Sheet 12C Hinge 13 Camber (spacing member) 14 Weight 22 Barricade Body 22A Horizontal Pipe 22B Leg pipe 22C Connecting pipe 22D Panel 30 Transport cart 31 Pipe 32 Caster 33 Single pipe orthogonal clamp 34 Chain Block 34a Chain 34b,35 Screw clamp 40 Temporary steel protective fence

Claims

1. a long foundation member having a pair of upward flanges and placed on the ground; A temporary protective fence comprising: a barricade body having a lower end inserted between the pair of flanges of the foundation member and having an inverted V shape in side view; The barricade body is provided with a warning panel having a reflective sheet attached or a reflective layer applied to its surface, and is configured so that the opening degree of the pair of legs in a side view can be adjusted by a hinge provided at the top, A temporary protective fence characterized in that a spacing member is disposed between the pair of legs to maintain the spacing between the legs.

2. 2. The temporary protective fence according to claim 1, wherein a weight is placed between the pair of flanges of the base member.

3. The barricade body includes two panel members whose upper portions are rotatably connected by the hinge, A temporary protective fence as described in claim 1 or 2, characterized in that the two panel members have a plurality of openings formed therein, and a reflective sheet is attached or a reflective layer is applied to the surface of the flat plate on which the plurality of openings are not formed, so that the two panel members function as the warning panels.

4. The foundation member is an earth retaining member having a pair of flanges, A temporary protective fence as described in claim 3, characterized in that the lower parts of the two panel members are tied to the foundation member by strip-shaped or string-shaped connecting members inserted into holes provided in the flanges of the foundation member.

5. A method for installing a temporary protective fence according to any one of claims 1 to 4 in a road construction area using a dedicated cart with casters, comprising: the carriage includes a pair of arm members provided at the front and rear of the carriage and extending laterally, chain blocks provided on each of the pair of arm members and capable of raising and lowering the base member, and a gripping means extended on the side of the carriage opposite to the extension side of the arm members, a transport preparation step in which the dolly is positioned to the side of the temporary protective fence or foundation member to be transported, and a heavy object having casters and a stepped surface portion is positioned on the side of the dolly opposite to the side where the temporary protective fence or foundation member is located; a gripping step of gripping the surface step portion of the heavy object with the gripping means; a lifting step of clamping a part of the foundation member with a clamper at the tip of the chain of the chain block to lift the temporary protective fence or the foundation member; a transport step of moving the dolly with the temporary protective fence or foundation member hoisted and the heavy object to a predetermined position; an installation process in which the temporary protective fence or the foundation member is lowered onto a road while a part of the foundation member is clamped by the chain block, and the clamping of the foundation member by the clamper is released; a release step of releasing the grip of the surface step portion of the heavy object by the gripping means; a separating step of separating the carriage and the heavy object from an installation location of the temporary protective fence or the foundation member; A method for installing a temporary protective fence, comprising:

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