Guardrail

Abstract

To provide a guard fence that stably exhibits high absorption performance against vehicle collision energy.SOLUTION: A guard fence 1 comprises guard fence bodies 2 and locking devices 3. The locking device 3 has a locking pipe 30, an insertion pipe 32, and a positioning part 42. The locking pipe 30 has an inner diameter capable of securing a clearance between an outer peripheral surface of the insertion pipe 32 inserted to a space inside the locking pipe 30 and an inner peripheral surface of the locking pipe 30. The positioning part 42 is configured to position a horizontal directional position of the insertion pipe 32 in a direction orthogonal to an extension direction of a first road to a predefined position where a clearance is formed between a first reverse road side portion 32d of the insertion pipe 32 and a first opposed portion 30a of the locking pipe 30. The positioning part is also configured to permit a horizontal displacement of the insertion pipe 32 up to a position abutting the first reverse road side portion 32d relative to the first opposed portion 30a by a vehicle collision load when the vehicle collides with the guard fence body 2 from the first road.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a safety fence. [Background technology]

[0002] Conventionally, there has been known a guardrail that is installed at a location adjacent to a road on which vehicles travel and that catches a vehicle when the vehicle deviates from the road. For example, Patent Document 1 listed below discloses an example of such a guardrail.

[0003] The protective fence disclosed in the following Patent Document 1 is a movable protective fence that is configured to be movable from its installation location. This movable protective fence includes multiple movable side members, a beam, a fixed pipe, and multiple connecting members.

[0004] The plurality of movable side members are each configured to be movable on a road from an installation location. Each movable side member has a cylindrical support extending in the vertical direction. The beam extends in a direction crossing the support of the plurality of movable side members and connects the support. The fixed pipe is fixed to the ground at the installation location.

[0005] The multiple connecting members are respectively housed within the support columns of the multiple movable-side members so as to be movable in the vertical direction. Each connecting member is disposed across the space within the support column of the movable-side member and the space within the fixed tube, and is movable in the vertical direction between a first height position where the connecting member connects the support column of the movable-side member to the fixed tube, and a second height position where the connecting member is inserted into the space within the support column of the movable-side member and is removed upward from the space within the fixed tube. The protective fence also has a holding portion that holds each connecting member at the second height position.

[0006] During normal use of the movable guardrail disclosed in Patent Document 1 below, each connecting member is placed at a first height position at the installation location, and the connecting members connect the support posts of each movable member to each fixed tube, thereby fixing the movable member to the installation location. Meanwhile, in an emergency, each connecting member is raised to a second height position and held at the second height position by a holding part, thereby releasing the connection between the support posts of each movable member and each fixed tube by each connecting member. This makes each movable member movable, and as a result, the movable guardrail can be moved from the installation location. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6014782 Summary of the Invention [Problem to be solved by the invention]

[0008] In recent years, there has been a demand for improving the ability of protective fences to absorb vehicle collision energy. In the movable protective fence disclosed in Patent Document 1, for example, by enlarging the inner diameter of the fixed pipe, the horizontal movement distance of the connecting member inserted in the space inside the fixed pipe and the inclination allowance of the connecting member can be secured, and it is possible to obtain an effect of absorbing collision energy caused by the horizontal movement of the movable protective fence hit by the vehicle, and an effect of absorbing collision energy caused by the movable protective fence falling down by the amount of inclination of the connecting member in the space inside the fixed pipe when hit by the vehicle, and as a result, it is possible to improve the ability of the protective fence to absorb vehicle collision energy.

[0009] However, in this case, there is a problem that the stability of the absorption performance of the safety fence against the collision energy of the vehicle cannot be ensured. Specifically, when the inner diameter of the fixed pipe is enlarged as described above, the horizontal position of the connecting member in the space inside the fixed pipe is not fixed, and when the connecting member is located closer to the road in the space inside the fixed pipe, the distance that the connecting member and the movable side member move horizontally when the vehicle collides with the safety fence from the road becomes large, and high absorption performance of the safety fence against the collision energy of the vehicle is obtained, whereas when the connecting member is located closer to the pipe wall on the side farther from the road in the space inside the fixed pipe, the distance that the connecting member and the movable side member move horizontally when the vehicle collides with the safety fence from the road becomes relatively small, and as a result, the improvement in the absorption performance of the safety fence against the collision energy of the vehicle is relatively small. In this way, the absorption performance of the safety fence against the collision energy of the vehicle differs depending on the horizontal position of the connecting member in the space inside the fixed pipe, and the stability of the absorption performance of the safety fence cannot be ensured.

[0010] An object of the present invention is to provide a safety fence that exhibits stable and high absorption performance against vehicle collision energy. [Means for solving the problem]

[0011] The present invention provides a guardrail that is installed at an installation location adjacent to a road on which vehicles travel and that catches a vehicle when the vehicle deviates from the road. The guardrail includes a guardrail main body that is installed on the ground of the installation location so as to be movable from the installation location, and a fixing device for fixing the guardrail main body at the installation location. The guardrail main body has a support pipe extending in the vertical direction. The fixing device includes a fixing pipe that is buried in the ground of the installation location in an attitude that extends in the vertical direction, an insertion pipe that is inserted into a space within the support pipe and a space within the fixing pipe so as to span these spaces and connect the support pipe and the fixing pipe, and a positioning part that positions the horizontal position of the insertion pipe in the space within the fixing pipe. The fixing pipe has an inner diameter that can ensure a gap between an outer peripheral surface of the insertion pipe that is inserted into the space within the fixing pipe and an inner peripheral surface of the fixing pipe. The positioning portion is configured to position the horizontal position of the plug-in pipe at a predetermined position where a gap is formed between the plug-in pipe anti-road side portion, which is the portion of the outer surface of the plug-in pipe inserted into the space within the fixed pipe that faces away from the road, and the fixed pipe opposing portion, which is the portion of the inner surface of the fixed pipe that faces the plug-in pipe anti-road side portion, and is configured to allow the plug-in pipe to move horizontally to a position where the plug-in pipe anti-road side portion abuts against the fixed pipe opposing portion due to the collision load of the vehicle when a vehicle collides with the protective fence main body from the road.

[0012] With this protective fence, when a vehicle collides with the protective fence main body from the road, the vehicle's collision energy can be absorbed by the tilting and horizontal movement of the plug-in pipe and the protective fence main body toward the opposite side of the road; moreover, the horizontal position of the plug-in pipe inserted into the space within the fixed pipe is positioned by the positioning part to a predetermined position where a gap is formed between the part of the plug-in pipe facing the road and the opposing part of the fixed pipe.This means that the amount of collision energy absorbed by the horizontal movement of the plug-in pipe and the protective fence main body toward the opposite side of the road is constant, and the fence can exhibit stable, high absorption performance against vehicle collision energy.

[0013] Specifically, in this guardrail, the fixed pipe has an inner diameter that allows a gap to be secured between the inner peripheral surface of the plug-in pipe inserted into the space within the fixed pipe, so that the plug-in pipe inserted into the space within the fixed pipe can tilt away from the road. Therefore, when a vehicle collides with the guardrail main body from the road, the plug-in pipe and the guardrail main body can tilt away from the road to absorb the collision energy of the vehicle. In addition, in this protective fence, the horizontal position of the plug-in pipe inserted into the fixed pipe is positioned by the positioning unit at a predetermined position where a gap is formed between the part of the plug-in pipe facing the fixed pipe and the opposing part of the fixed pipe, and the positioning unit is configured to allow the plug-in pipe to move horizontally to a position where the part of the plug-in pipe facing the fixed pipe abuts due to the collision load of the vehicle when a vehicle collides with the protective fence main body from the road.Therefore, when a vehicle collides with the protective fence main body from the road, the plug-in pipe and the protective fence main body move horizontally to the side opposite the road to absorb the vehicle collision energy, and moreover, the distance of horizontal movement of the plug-in pipe and the protective fence main body to the side opposite the road is constant due to the positioning of the plug-in pipe by the positioning unit, so the amount of vehicle collision energy absorbed by the horizontal movement of the plug-in pipe and the protective fence main body can be kept constant. As described above, with this protective fence, when a vehicle collides with the protective fence main body, the insertion pipe and the protective fence main body can absorb the vehicle collision energy by tilting and horizontally moving the insertion pipe and the protective fence main body toward the opposite side of the road, and the amount of vehicle collision energy absorbed by the horizontal movement of the insertion pipe and the protective fence main body toward the opposite side of the road can be kept constant, so that the fence can exhibit stable and high absorption performance against vehicle collision energy.

[0014] The installation location where the protective fence is to be installed is a median strip located between a first road and a second road, the insertion pipe anti-road side portion includes a first anti-road side portion that is a portion facing the opposite side to the first road and a second anti-road side portion that is a portion facing the opposite side to the second road, the fixed pipe opposing portion includes a first opposing portion that is a portion facing the first anti-road side portion and a second opposing portion that is a portion facing the second anti-road side portion, and the positioning portion adjusts the horizontal position of the insertion pipe so that a gap is formed between the first anti-road side portion of the insertion pipe and the first opposing portion of the fixed pipe, The plug-in pipe may be positioned at a predetermined position where a gap is formed between the second anti-road side portion of the plug-in pipe and the second opposing portion of the fixed pipe, and may be configured to allow the plug-in pipe to move horizontally to a position where the first anti-road side portion abuts against the first opposing portion due to the collision load of the vehicle when a vehicle collides with the protective fence main body from the first road, and to allow the plug-in pipe to move horizontally to a position where the second anti-road side portion abuts against the second opposing portion due to the collision load of the vehicle when a vehicle collides with the protective fence main body from the second road.

[0015] According to this configuration, a safety fence can be provided that can stably exhibit high collision energy absorption performance against both vehicle collisions from the first road and vehicle collisions from the second road in the central median strip.

[0016] The positioning portion comprises a top plate portion having an insertion hole through which the insertion pipe is inserted and installed on the upper end of the fixed pipe, which positions the horizontal position of the insertion pipe inserted into the insertion hole at the predetermined position, and a movement restricting protrusion which protrudes downward from the top plate portion into the space within the fixed pipe at a position outside the insertion hole and radially inside the fixed pipe, and restricts the horizontal movement of the top plate portion by abutting the inner surface of the fixed pipe, and the movement restricting protrusion may have a strength that allows it to deform when it comes into contact with the fixed pipe so as to allow the insertion pipe and the top plate portion to move horizontally to the opposite side of the road due to the collision load of the vehicle when the vehicle collides with the protective fence main body from the road.

[0017] In this case, a positioning section can be specifically configured to position the horizontal position of the insertion pipe at the specified position and to allow the insertion pipe to move horizontally to the opposite side of the road due to the collision load of the vehicle when the vehicle collides with the protective fence main body from the road.

[0018] The protective fence main body further comprises a road-side beam that faces the road and is disposed so as to extend along the road at a position on the road side relative to the support pipe when the protective fence main body is installed at the installation location, and a non-road-side beam that is disposed so as to extend along the road at a position on the opposite side of the road-side beam relative to the support pipe when the protective fence main body is installed at the installation location, and the insertion length of the plug-in pipe into the space within the fixed pipe, the difference between the inner diameter of the fixed pipe and the outer diameter of the plug-in pipe, and the distance from the lower end of the non-road-side beam to the ground at the installation location are determined so as to determine the forward collision distance when a vehicle collides with the protective fence main body from above the road. It is preferable that the insertion pipe and the protective fence main body move horizontally to a position where the anti-road side portion of the insertion pipe abuts against the opposing portion of the fixed pipe, and then the insertion pipe and the protective fence main body tilt away from the road so that the lower end of the insertion pipe abuts against the road side portion of the inner surface of the fixed pipe and the portion of the insertion pipe located upward from the lower end abuts against the upper end of the opposing portion of the fixed pipe, and then the insertion pipe is bent and deformed so that the protective fence main body further tilts away from the road until the lower end of the anti-road side beam contacts the ground at the installation location.

[0019] With this configuration, the above-mentioned operation of the plug-in pipe and the safety fence main body can be realized, which can effectively absorb the collision energy of a vehicle when the vehicle collides with the safety fence main body from the road.

[0020] It is preferable that the difference between the inner diameter of the fixed pipe and the outer diameter of the insertion pipe is set to be larger than the distance from the lower end of the beam on the opposite side to the road to the ground at the installation location.

[0021] With this configuration, when a vehicle collides with the guardrail main body, the plug-in pipe and the guardrail main body tilt away from the road so that the lower end of the plug-in pipe abuts against the road side portion of the inner circumferential surface of the fixed pipe and the portion above the lower end of the plug-in pipe abuts against the upper end of the opposing portion of the fixed pipe, and then the plug-in pipe bends and the guardrail main body tilts further away from the road until the lower end of the non-road side beam contacts the ground at the installation location. This prevents the lower end of the non-road side beam from contacting the ground at the installation location before the plug-in pipe bends and the guardrail main body is unable to fully absorb the vehicle collision energy due to the bending deformation of the plug-in pipe. Effect of the Invention

[0022] As described above, the present invention provides a safety fence that exhibits stable and high absorption performance against vehicle collision energy. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a front view of a safety fence according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a top view of a safety fence according to one embodiment of the present invention. [Diagram 3] 3 is a cross-sectional view of the protective fence shown in FIG. 1 taken along the line III-III in FIG. [Figure 4] This is a partial view showing the engagement state between the fixed pipe and positioning portion of the protective fence and the plug-in pipe inserted inside them, with the fixed pipe and positioning portion cut away. [Diagram 5] 5 is a cross-sectional view of the fixed tube, positioning portion, and plug-in tube of the protective fence at position VV in FIG. 4. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] 13 is a diagram for explaining the operation of the safety fence when a vehicle collides against the safety fence, showing the state before the vehicle collides. FIG. [Figure 10] FIG. 10 is a diagram for explaining the operation of the safety fence when a vehicle collides against it, showing the state in which the safety fence has been hit by the vehicle and has moved horizontally in the direction of the collision from the state shown in FIG. 9. [Figure 11] 11 is a diagram for explaining the operation of the safety fence when a vehicle collides against the safety fence, showing a state in which the safety fence has tilted from the state shown in FIG. 10 due to the collision load of the vehicle. FIG. [Figure 12] This figure explains the operation of the protective fence when a vehicle collides against it, and shows the state in which the insertion pipe has been bent and deformed by the vehicle collision load from the state in Figure 11, causing the protective fence to tilt further. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0025] A guardrail 1 according to one embodiment of the present invention is installed on the ground of a median strip of an expressway or other road so as to extend along the direction of the roads on both sides of the median strip, and is configured to catch vehicles traveling on the roads on both sides when the vehicles deviate from the road. In an emergency, a guardrail main body 2, which is part of the guardrail 1 and will be described later, can be moved from the installation location, and by moving the guardrail main body 2, a space can be secured for vehicles to make a U-turn or enter from one of the roads on both sides of the median strip to the other.

[0026] The safety fence 1 comprises a plurality of safety fence bodies 2 (see FIG. 1), a plurality of fixing devices 3 (see FIG. 1), and a plurality of connecting members 4 (see FIG. 2).

[0027] Each of the multiple protective fence bodies 2 extends in a specific longitudinal direction and is arranged so as to follow the road in that longitudinal direction. In this embodiment, the multiple protective fence bodies 2 are arranged side by side along the extension direction of the road on both sides of the median strip, separating one road from the road on the opposite lane. The protective fence body 2 is movable on the ground G as the rolling members of the rolling bodies 22 described below roll on the ground G. The protective fence body 2 includes multiple bases 6, multiple support pipes 8, a first beam 10, a second beam 12 (see FIG. 2), and multiple beam connecting members 13.

[0028] The multiple bases 6 are parts that form the base of the protective fence main body 2, and are each configured to be movable on the ground G. In this embodiment, the protective fence main body 2 has two bases 6. Each base 6 has a base plate 20 and multiple rolling elements 22, as shown in FIG.

[0029] The base plate 20 is a flat plate disposed substantially horizontally. The base plate 20 has a through hole passing through the base plate 20 in the up-down direction (the plate thickness direction of the base plate 20).

[0030] The multiple rolling elements 22 are configured to be able to roll on the ground G along the ground G, and are intended to enable the base 6 to move on the ground G. The multiple rolling elements 22 are each attached to the base plate 20. The rolling elements 22 are so-called casters. In this embodiment, each base 6 has four rolling elements 22. The four rolling elements 22 are arranged two on each side of the through hole of the base plate 20. The four rolling elements 22 protrude downward from the base plate 20 and contact the ground G to support the base plate 20 from below.

[0031] 1, the multiple support pipes 8 are fixed to the multiple bases 6 so as to stand upright from each of the multiple bases 6 at multiple positions aligned in the longitudinal direction of the protective fence main body 2. In this embodiment, the protective fence main body 2 has two support pipes 8. Each support pipe 8 is cylindrical, and is inserted into a through-hole in a base plate 20 of each base 6 to pass through the base plate 20 and is fixed to the base plate 20 in a position extending upward from the base plate 20.

[0032] As shown in Figures 2 and 3, the first beam 10 and the second beam 12 are arranged on both sides of the plurality of support pipes 8 in the width direction of the protective fence main body 2, which is perpendicular to both the longitudinal direction and the height direction of the protective fence main body 2, and are fixed to the plurality of support pipes 8 via beam connecting members 13. The first beam 10 and the second beam 12 are located on the outermost sides on both sides in the width direction of the protective fence main body 2. When a vehicle collides with the protective fence main body 2 from the first road, the first beam 10 is an example of a road-side beam in the present invention, and the second beam 12 is an example of a non-road-side beam in the present invention. When a vehicle collides with the protective fence main body 2 from the second road, the second beam 12 is an example of a road-side beam in the present invention, and the first beam 10 is an example of a non-road-side beam in the present invention.

[0033] The first beam 10 faces the first road, which is one of the roads located on both sides of the safety fence 1, and constitutes a surface that is struck by a vehicle traveling on the first road when the vehicle deviates from the first road onto the central reservation. As shown in FIG. 3, the first beam 10 is made of a first upper beam 10a and a first lower beam 10b arranged vertically side by side. The first upper beam 10a is made of a thin plate whose vertical cross section is corrugated, and extends along the longitudinal direction of the safety fence main body 2. The first lower beam 10b has a similar shape to the first upper beam 10a, and extends below the first upper beam 10a in parallel with the first upper beam 10a.

[0034] The second beam 12 faces the second road, which is the road located on the opposite side of the guardrail 1 from the first road, and constitutes a surface that receives a collision of a vehicle traveling on the second road when the vehicle deviates from the second road onto the central reservation. As shown in FIG. 3, the second beam 12 is composed of a second upper beam 12a and a second lower beam 12b arranged vertically. The second upper beam 12a is symmetrical to the first upper beam 10a and extends along the longitudinal direction of the guardrail main body 2. The second lower beam 12b has a similar shape to the second upper beam 12a and is symmetrical to the first lower beam 10b, and extends below the second upper beam 12a in parallel with the second upper beam 12a.

[0035] As shown in Figures 2 and 3, the beam connecting members 13 are respectively interposed between the first upper beam 10a and the second upper beam 12a and between the first lower beam 10b and the second lower beam 12b. The beam connecting members 13 interposed between the first upper beam 10a and the second upper beam 12a connect the first upper beam 10a and the second upper beam 12a in the width direction of the safety fence main body 2 and connect the first upper beam 10a and the second upper beam 12a to the support pipe 8. The beam connecting members 13 interposed between the first lower beam 10b and the second lower beam 12b connect the first lower beam 10b and the second lower beam 12b in the width direction of the safety fence main body 2 and connect the first lower beam 10b and the second lower beam 12b to the support pipe 8. Therefore, the first upper beam 10a and the second upper beam 12a are connected to the support pipe 8 via a beam connecting member 13 that connects them. Also, the first lower beam 10b and the second lower beam 12b are connected to the support pipe 8 via a beam connecting member 13 that connects them.

[0036] The multiple fixing devices 3 (see FIG. 1 ) are for fixing each protective fence main body 2 at its installation position when it is placed at the installation position. The fixing devices 3 are configured to be switchable between a fixed state in which the protective fence main body 2 is fixed to the ground G at its installation position, and an unlocked state in which the fixation is released and the protective fence main body 2 is allowed to move on the ground G. Specifically, in the fixed state, the fixing devices 3 fix the corresponding base parts 6 of the protective fence main body 2 to the ground G at its installation position, and in the unlocked state, the fixing devices 3 release the fixation of the corresponding base parts 6 and allow the base parts 6 to move on the ground G.

[0037] The fixing devices 3 are installed in a line at intervals along the extension direction of the first and second roads at the installation location (the median strip in this embodiment) of the protective fence 1. Each fixing device 3 has a fixing pipe 30, an insertion pipe 32, and a positioning portion 42.

[0038] The fixed pipe 30 is buried and fixed under the ground G at the installation site of the protective fence 1. The fixed pipe 30 is a hollow cylinder, and is buried in the ground in a vertically extending position to secure a space inside for receiving the plug-in pipe 32. The fixed pipe 30 is arranged so that the position of its upper end coincides with the position of the ground G. The upper end of the fixed pipe 30 is open. The inner peripheral surface of the fixed pipe 30 has a first opposing portion 30a which is a portion facing the first opposite-road portion 32d of the plug-in pipe 32 inserted into the space inside the fixed pipe 30 as described later, and a second opposing portion 30b which is a portion facing the second opposite-road portion 32e of the plug-in pipe 32. The first opposing portion 30a and the second opposing portion 30b are examples of the fixed pipe opposing portions in the present invention.

[0039] 1 and 3, when the fixing device 3 is in the fixed state, the plug-in pipe 32 is inserted into the space within the support pipe 8 and the space within the fixed pipe 30 so as to span these spaces, interconnecting the support pipe 8 and the fixed pipe 30, thereby fixing the support pipe 8 and the protective fence main body 2 having it to the installation location. When the fixing device 3 is in the released state, this plug-in pipe 32 is pulled upward from the space within the fixed pipe 30 and the space within the support pipe 8, releasing the fixation of the base 6 to the ground G and allowing the base 6 to move on the ground G.

[0040] The plug-in tube 32 has a cylindrical plug-in tube body 32a inserted into the space in the support tube 8 and the space in the fixed tube 30, a flange 32b attached to the upper end of the plug-in tube body 32a so as to protrude radially outward from the upper end, and a handle 32c attached to the upper end of the plug-in tube body 32a. The flange 32b has an outer diameter larger than the outer diameter of the support tube 8 and abuts against the upper end of the support tube 8 in the fixed state, thereby holding the plug-in tube 32 at a height position (see FIG. 3) where the plug-in tube 32 connects the support tube 8 and the fixed tube 30 to each other. The handle 32c is a part that is held by an operator when inserting and removing the plug-in tube 32 into and from the space in the support tube 8 and the space in the fixed tube 30.

[0041] The plug-in pipe body 32a has a first anti-road side portion 32d which is a portion of the outer circumferential surface of the plug-in pipe body 32a facing away from the first road, and a second anti-road side portion 32e which is a portion of the outer circumferential surface of the plug-in pipe body 32a facing away from the second road. The first anti-road side portion 32d and the second anti-road side portion 32e are examples of the anti-road side portions in the present invention.

[0042] The positioning unit 42 (see FIG. 4) is attached to the upper end of the fixed pipe 30 and determines the horizontal position of the plug-in pipe 32 inserted into the space inside the fixed pipe 30. Specifically, the positioning unit 42 is configured to determine the horizontal position of the plug-in pipe 32 at a predetermined position where a gap is formed between the first opposite-road-side portion 32d and the first opposing portion 30a of the fixed pipe 30 and a gap is formed between the second opposite-road-side portion 32e and the second opposing portion 30b of the fixed pipe 30. More specifically, the positioning unit 42 determines the horizontal position of the plug-in pipe 32 at a predetermined position where a gap is formed between the outer circumferential surface of the plug-in pipe 32 and the inner circumferential surface of the fixed pipe 30 over the entire circumferential direction thereof. That is, the positioning unit 42 determines the horizontal position of the insertion pipe 32 in the space inside the fixed pipe 30 in the direction perpendicular to the extension direction of the first and second roads, and the horizontal position of the insertion pipe 32 in the space inside the fixed pipe 30 in the direction along the extension direction of the first and second roads. The positioning unit 42 is also configured to allow the insertion pipe 32 to move horizontally to a position where the first anti-road side portion 32d of the insertion pipe 32 abuts against the first opposing portion 30a of the fixed pipe 30 due to the collision load of the vehicle when a vehicle collides with the protective fence main body 2 from the first road, and to allow the insertion pipe 32 to move horizontally to a position where the second anti-road side portion 32e of the insertion pipe 32 abuts against the second opposing portion 30b of the fixed pipe 30 due to the collision load of the vehicle when a vehicle collides with the protective fence main body 2 from the second road.

[0043] The positioning portion 42 has a top plate portion 44, an extension portion 46, and a plurality of movement restricting protrusions 48.

[0044] The top plate portion 44 is installed on the upper end of the fixed pipe 30. The top plate portion 44 has an insertion hole 44a through which the insertion pipe 32 is inserted. The insertion hole 44a is a round hole having a diameter slightly larger than the outer diameter of the insertion pipe 32, and penetrates the top plate portion 44 in the vertical direction. When the top plate portion 44 is installed on the upper end of the fixed pipe 30, the insertion hole 44a is arranged so that its center is located on the axis of the fixed pipe 30. The top plate portion 44 positions the horizontal position of the insertion pipe 32 inserted into the insertion hole 44a at the predetermined position. The top plate portion 44 also has a function of covering the gap between the inner edge of the upper end of the fixed pipe 30 and the outer circumferential surface of the insertion pipe 32, and suppressing foreign objects such as gravel and garbage from falling into the space inside the fixed pipe 30 through the gap.

[0045] The extension portion 46 is a cylindrical portion that extends downward from the edge of the insertion hole 44a of the top plate portion 44 into the space inside the fixed pipe 30. The extension portion 46 is disposed so that its axis coincides with the axis of the fixed pipe 30. The extension portion 46 has an inner diameter slightly larger than the outer diameter of the insertion pipe 32, and the insertion pipe 32 is inserted into its inside. In other words, the insertion pipe 32 is inserted into the space inside the fixed pipe 30 through the insertion hole 44a of the top plate portion 44 and the inside of the extension portion 46.

[0046] The multiple movement restricting protrusions 48 each protrude downward from the top plate portion 44 into the space within the fixed tube 30 at a position outside the insertion hole 44a and radially inside the fixed tube 30. The multiple movement restricting protrusions 48 restrict horizontal movement of the top plate portion 44 by abutting against the inner circumferential surface of the fixed tube 30. As shown in Figures 5 and 6, the multiple movement restricting protrusions 48 are disposed at equal intervals in the circumferential direction of the insertion hole 44a and the extension portion 46, i.e., in the circumferential direction of the fixed tube 30. In this embodiment, each movement restricting protrusion 48 is formed of a rivet driven into the top plate portion 44.

[0047] The movement restricting projections 48 have a strength that allows the insertion pipe 32 and the top plate 44 to move horizontally to the opposite side of the first road due to the collision load of a vehicle when the vehicle collides with the protective fence main body 2 from the first road, and has the strength to deform when it comes into contact with the fixed pipe 30 so as to allow the insertion pipe 32 and the top plate 44 to move horizontally to the opposite side of the second road due to the collision load of a vehicle when the vehicle collides with the protective fence main body 2 from the second road. In other words, each movement restricting projection 48 is capable of being crushed when it comes into contact with the fixed pipe 30 due to the collision load of the vehicle, and by being crushed in this manner, the insertion pipe 32 and the top plate 44 are allowed to move horizontally to the opposite side of the first and second roads.

[0048] In this embodiment, as shown in Figures 9 and 10, the insertion length L of the insertion pipe 32 into the space within the fixed pipe 30, the difference 2x between the inner diameter of the fixed pipe 30 and the outer diameter of the insertion pipe 32, and the distance y from the lower end of the first lower beam 10b to the ground G are determined based on the following: when a vehicle collides with the protective fence main body 2 from above the first road, the insertion pipe 32 and the protective fence main body 2 move horizontally to a position where the first anti-road side portion 32d of the insertion pipe 32 abuts against the first opposing portion 30a of the fixed pipe 30, and then the lower end of the insertion pipe 32 is located on the first road side of the inner circumferential surface of the fixed pipe 30. The plug-in pipe 32 and the protective fence main body 2 tilt away from the first road so that the plug-in pipe 32 abuts against the upper end (support portion A) of the first opposing portion 30a of the fixed pipe 30, and then the plug-in pipe 32 bends and deforms at the position where it abuts against the upper end (support portion A) of the first opposing portion 30a of the fixed pipe 30, causing the protective fence main body 2 to tilt further away from the first road until the lower end of the second lower beam 12b contacts the ground G.

[0049] In addition, the insertion length L of the plug-in pipe 32 into the space within the fixed pipe 30, the difference 2x between the inner diameter of the fixed pipe 30 and the outer diameter of the plug-in pipe 32, and the distance y from the lower end of the second lower beam 12b to the ground G are set as follows: when a vehicle collides with the protective fence main body 2 from above the second road, the plug-in pipe 32 and the protective fence main body 2 move horizontally to a position where the second anti-road side portion 32e of the plug-in pipe 32 abuts against the second opposing portion 30b of the fixed pipe 30, and then the lower end of the plug-in pipe 32 abuts against the second road side portion of the inner surface of the fixed pipe 30. The plug-in pipe 32 and the protective fence main body 2 tilt away from the second road so that the portion of the plug-in pipe 32 located upward from the lower end thereof abuts the upper end of the second opposing portion 30b of the fixed pipe 30, and then the plug-in pipe 32 is bent and deformed at the position where it abuts the upper end of the second opposing portion 30b of the fixed pipe 30, causing the protective fence main body 2 to tilt further away from the second road until the lower end of the first lower beam 10b contacts the ground G.

[0050] In addition, the distance from the lower ends of the first and second lower beams 10b, 12b to the ground G is set to be larger than the difference 2x between the inner diameter of the fixed pipe 30 and the outer diameter of the insertion pipe 32.

[0051] The multiple connection members 4 each connect adjacent ends of adjacent protective fence main bodies 2. Each connection member 4 is detachable from an end in the extension direction of the protective fence main body 2, and is attached to adjacent ends of adjacent protective fence main bodies 2 to connect those ends when the multiple protective fence main bodies 2 are installed side by side at the installation location.

[0052] Next, an operation will be described when a vehicle collides with the safety fence 1 according to this embodiment and the safety fence 1 absorbs the collision energy of the vehicle.

[0053] First, before a vehicle collides with the safety fence 1, as shown in Figure 9, the insertion pipe 32 is inserted into the space inside the support pipe 8 of the safety fence main body 2, and is positioned coaxially with the fixed pipe 30 by the positioning part 42. In other words, a uniform gap x is formed between the outer circumferential surface of the insertion pipe 32 and the inner circumferential surface of the fixed pipe 30 over the entire circumference of these outer and inner circumferential surfaces.

[0054] Then, the vehicle collides with the protective fence body 2 of the protective fence 1. At this time, for example, a vehicle traveling on the first road deviates from the first road toward the median strip and collides with the protective fence body 2. At this time, the protective fence body 2 receives the collision load P of the vehicle, and the protective fence body 2 and the plug-in pipe 32 move horizontally toward the opposite side to the first road as shown in FIG. 10. Specifically, the plug-in pipe 32 and the protective fence body 2 move horizontally toward the opposite side to the first road (the second road side) until the first opposite side portion 32d of the plug-in pipe 32 inserted into the space inside the fixed pipe 30 abuts against the first opposite portion 30a of the fixed pipe 30. At this time, among the multiple movement restriction protrusions 48 (see FIG. 7 and FIG. 8) of the positioning portion 42, the one located on the far side from the first road hits the pipe wall at the upper end of the fixed pipe 30 and is crushed by the collision load P, so that the horizontal movement of the plug-in pipe 32 positioned by the positioning portion 42 toward the opposite side to the first road is permitted. A part of the collision energy of the vehicle is absorbed by the resistance force when the movement restricting projection 48 is crushed and the horizontal movement of the protective fence main body 2, which is a heavy object.

[0055] Then, after the plug-in pipe 32 and the protective fence main body 2 have moved horizontally as described above, as shown in Fig. 11, the plug-in pipe 32 tilts away from the first road, using support part A, which is the upper end of the first opposing part 30a of the fixed pipe 30, as a fulcrum, until the lower end of the plug-in pipe 32 hits the part of the inner circumferential surface of the fixed pipe 30 on the first road side (the second opposing part 30b), and the protective fence main body 2 tilts away from the first road. At this time, the inclination angle θ1 of the plug-in pipe 32 and the protective fence main body 2 with respect to the embedding direction of the fixed pipe 30 into the ground (the axial direction of the fixed pipe 30) is about 5°. This tilting of the plug-in pipe 32 and the protective fence main body 2 absorbs a further part of the vehicle collision energy.

[0056] After the plug-in pipe 32 and the protective fence main body 2 tilt in this way, the collision load P causes the protective fence main body 2 to further tilt away from the first road while bending and deforming so that the plug-in pipe 32 is bent at the position where it hits the support part A, as shown in Fig. 12. At this time, the protective fence main body 2 tilts until the lower end of the second lower beam 12b contacts the ground G. In this state in which the protective fence main body 2 is tilted until the lower end of the second lower beam 12b contacts the ground G, the inclination angle θ2 of the protective fence main body 2 with respect to the embedding direction of the fixed pipe 30 into the ground (the axial direction of the fixed pipe 30) is about 8°. This tilting of the protective fence main body 2 and the bending deformation of the plug-in pipe 32 further absorb a part of the vehicle collision energy.

[0057] Through the above-mentioned operations, the collision energy of the vehicle is absorbed by the safety fence 1 of this embodiment. Furthermore, if a vehicle collides with the safety fence main body 2 from the second road, the above-mentioned operations are performed similarly, with the first road side replaced by the second road side, and the collision energy due to the vehicle colliding from the second road is similarly absorbed.

[0058] In the protective fence 1 of this embodiment, when a vehicle collides with the protective fence main body 2 from the first road, the vehicle collision energy can be absorbed by the tilting and horizontal movement of the plug-in pipe 32 and the protective fence main body 2 toward the opposite side of the first road, and when a vehicle collides with the protective fence main body 2 from the second road, the vehicle collision energy can be absorbed by the tilting and horizontal movement of the plug-in pipe 32 and the protective fence main body 2 toward the opposite side of the second road. Moreover, in this protective fence 1, the horizontal position of the plug-in pipe 32 inserted into the space within the fixed pipe 30 is positioned by the positioning part 42 to a predetermined position where a gap is formed between the first anti-road side portion 32d of the plug-in pipe 32 and the first opposing portion 30a of the fixed pipe 30, and a gap is formed between the second anti-road side portion 32e of the plug-in pipe 32 and the second opposing portion 30b of the fixed pipe 30, so that the amount of collision energy absorbed by the horizontal movement of the plug-in pipe 32 and the protective fence main body 2 toward the opposite side to the first road is constant, and the amount of collision energy absorbed by the horizontal movement of the plug-in pipe 32 and the protective fence main body 2 toward the opposite side to the second road is constant. Therefore, the protective fence 1 can stably exhibit high absorption performance against vehicle collision energy.

[0059] Specifically, in the protective fence 1 according to this embodiment, the fixed pipe 30 has an inner diameter that allows a gap to be secured between the outer circumferential surface of the plug-in pipe 32 inserted into the space within the fixed pipe 30 and the inner circumferential surface of the fixed pipe 30, so that the plug-in pipe 32 inserted into the space within the fixed pipe 30 can tilt toward the opposite side of the first road or the opposite side of the second road. Therefore, when a vehicle collides with the protective fence main body 2 from the first road, the plug-in pipe 32 and the protective fence main body 2 tilt toward the opposite side of the first road to absorb the collision energy of the vehicle, and when a vehicle collides with the protective fence main body 2 from the second road, the plug-in pipe 32 and the protective fence main body 2 tilt toward the opposite side of the second road to absorb the collision energy of the vehicle.

[0060] In addition, in this protective fence 1, the horizontal position of the plug-in pipe 32 inserted into the fixed pipe 30 is positioned by the positioning portion 42 at a predetermined position where a gap is formed between the first anti-road side portion 32d of the plug-in pipe 32 and the first opposing portion 30a of the fixed pipe 30, and where a gap is formed between the second anti-road side portion 32e of the plug-in pipe 32 and the second opposing portion 30b of the fixed pipe 30. The positioning portion 42 is configured to allow the plug-in pipe 32 to move horizontally to a position where the first anti-road side portion 32d abuts against the first opposing portion 30a when a vehicle collides with the protective fence main body 2 from the first road, due to the collision load of the vehicle, and to allow the plug-in pipe 32 to move horizontally to a position where the movement limiting protrusion 48 abuts against the first opposing portion 30a when a vehicle collides with the protective fence main body 2 from the second road, due to the collision load of the vehicle, and to allow the plug-in pipe 32 to move horizontally to a position where the second anti-road side portion 32e abuts against the second opposing portion 30b. Therefore, when a vehicle collides with the protective fence main body 2 from the first road, the plug-in pipe 32 and the protective fence main body 2 move horizontally to the opposite side of the first road to absorb the vehicle collision energy, and when a vehicle collides with the protective fence main body 2 from the second road, the plug-in pipe 32 and the protective fence main body 2 move horizontally to the opposite side of the second road to absorb the vehicle collision energy.Moreover, since the distance of horizontal movement of the plug-in pipe 32 and the protective fence main body 2 in these cases is constant due to the positioning of the plug-in pipe 32 by the positioning section 42, the amount of vehicle collision energy absorbed by the horizontal movement of the plug-in pipe 32 and the protective fence main body 2 can be kept constant.

[0061] As described above, the protective fence 1 of this embodiment can absorb the vehicle collision energy by tilting and horizontally moving the insertion pipe 32 and the protective fence main body 2 when the vehicle collides with the protective fence main body 2, and can maintain a constant amount of vehicle collision energy absorbed by the horizontal movement of the insertion pipe 32 and the protective fence main body 2, thereby providing stable and high absorption performance against vehicle collision energy. Moreover, the protective fence 1 of this embodiment can provide stable and high absorption performance against vehicle collision energy for both vehicle collisions from the first road and vehicle collisions from the second road on the central median strip.

[0062] In addition, in the protective fence 1 according to this embodiment, the insertion length L of the plug-in pipe 32 into the space within the fixed pipe 30, the difference 2x between the inner diameter of the fixed pipe 30 and the outer diameter of the plug-in pipe 32, and the distance y from the lower end of the second lower beam 12b to the ground G at the installation location of the protective fence 1 are such that, when a vehicle collides with the protective fence main body 2 from above the first road, the plug-in pipe 32 and the protective fence main body 2 move horizontally until the first anti-road side portion 32d of the plug-in pipe 32 abuts against the first opposing portion 30a of the fixed pipe 30, and then the lower end of the plug-in pipe 32 abuts against the first road side portion of the inner surface of the fixed pipe 30 (the The insertion pipe 32 and the protective fence main body 2 tilt away from the first road so that the insertion pipe 32 abuts against the upper end (support portion A) of the first opposing portion 30a of the fixed pipe 30 and the portion of the insertion pipe 32 located upward from the lower end abuts against the upper end (support portion A) of the first opposing portion 30a of the fixed pipe 30, and then the insertion pipe 32 bends and deforms at the position where it abuts against the upper end (support portion A) of the first opposing portion 30a, causing the protective fence main body 2 to tilt further away from the first road until the lower end of the second lower beam 12b contacts the ground G. In addition, in the protective fence 1 according to this embodiment, the insertion length L of the plug-in pipe 32 into the space within the fixed pipe 30, the difference 2x between the inner diameter of the fixed pipe 30 and the outer diameter of the plug-in pipe 32, and the distance y from the lower end of the first lower beam 10b to the ground G at the installation location of the protective fence 1 are set so that, when a vehicle collides with the protective fence main body 2 from above the second road, the plug-in pipe 32 and the protective fence main body 2 move horizontally until the second anti-road side portion 32e of the plug-in pipe 32 abuts against the second opposing portion 30b of the fixed pipe 30, and then the lower end of the plug-in pipe 32 is located within the second road area of ​​the inner circumferential surface of the fixed pipe 30. The insertion pipe 32 and the guard fence main body 2 are tilted away from the second road so that the insertion pipe 32 abuts against the portion (first opposing portion 30a) on the side of the first road and the portion above the lower end of the insertion pipe 32 abuts against the upper end of the second opposing portion 30b of the fixed pipe 30, and then the insertion pipe 32 is bent and deformed at the position where it abuts against the upper end of the second opposing portion 30b, and the guard fence main body 2 is further tilted away from the second road until the lower end of the first lower beam 10b contacts the ground G. In order to realize such an operation of the insertion pipe 32 and the guard fence main body 2, the distance y from the lower ends of the first and second lower beams 10b, 12b to the ground G at the installation location of the guard fence 1 is set to be larger than the difference 2y between the inner diameter of the fixed pipe 30 and the outer diameter of the insertion pipe 32.

[0063] When a vehicle collides with the protective fence main body 2, the above-mentioned operation of the plug-in pipe 32 and the protective fence main body 2 is performed, and thus the collision energy of the vehicle can be absorbed well. Specifically, in a conventional protective fence, a gap that allows the plug-in pipe to move horizontally and tilt in the space inside the fixed pipe is not secured between the inner peripheral surface of the fixed pipe and the outer peripheral surface of the plug-in pipe, so that the vehicle collision energy absorption effect by the horizontal movement and tilt of the plug-in pipe and the protective fence main body at the time of a vehicle collision cannot be obtained, but in the protective fence 1 of this embodiment, as described above, the plug-in pipe 32 and the protective fence main body 2 first move horizontally to the opposite side of the road at the time of a vehicle collision, thereby absorbing the vehicle collision energy, and then the plug-in pipe 32 and the protective fence main body 2 tilt to the opposite side of the road, thereby absorbing the vehicle collision energy. Furthermore, if the plug-in pipe 32 and the protective fence main body 2 tilt away from the road and the lower end of the first lower beam 10b or the lower end of the second lower beam 12b contacts the ground G before the plug-in pipe 32 is bent, the tilting of the protective fence main body 2 stops at that point, and the vehicle collision energy absorption effect due to the bending deformation of the plug-in pipe 32 is not obtained. In contrast, with the protective fence 1 of this embodiment, when a vehicle collides from the first road, the plug-in pipe 32 bends and the protective fence main body 2 tilts away from the first road until the lower end of the second lower beam 12b contacts the ground G, and when a vehicle collides from the second road, the plug-in pipe 32 bends and the protective fence main body 2 tilts away from the second road until the lower end of the first lower beam 10b contacts the ground G, and therefore the vehicle collision energy absorption effect due to the bending deformation of the plug-in pipe 32 can be fully obtained. As described above, in the safety fence 1 according to this embodiment, when a vehicle collides with the safety fence main body 2, the insertion pipe 32 and the safety fence main body 2 can operate in a manner that allows the collision energy of the vehicle to be effectively absorbed.

[0064] The safety fence according to the present invention is not necessarily limited to the above-mentioned configuration. For example, the safety fence according to the present invention may have the following configuration.

[0065] The positioning portion in the protective fence according to the present invention is not necessarily limited to that used in the above embodiment, and various configurations can be adopted, as long as it is capable of positioning the horizontal position of the plug-in pipe inserted into the space within the fixed pipe.

[0066] For example, the movement restricting protrusion of the positioning portion in the present invention may be a bolt screwed into and fixed in the disc portion so as to protrude downward from the disc portion, or a round piece of steel welded to the disc portion so as to protrude downward from the disc portion, or a part of the disc portion bent up so as to protrude downward from the disc portion.

[0067] The positioning portion in the present invention may be an annular plate welded to the upper end of the fixed tube, with the plug-in tube inserted inside. The positioning portion may be formed by subjecting the fixed tube to drawing or the like so as to protrude a part of the wall of the fixed tube radially inward.

[0068] The positioning portion according to the present invention may be provided on the plug-in tube. In this case, the positioning portion may be a plate-like member or a protrusion provided on the portion of the plug-in tube that is inserted into the space in the fixed tube so as to protrude radially outward. The positioning portion provided on the plug-in tube may be a portion of the plug-in tube that is bent so as to protrude radially outward. The positioning portion provided on such a plug-in tube determines the horizontal position of the plug-in tube in the space in the fixed tube by contacting the inner peripheral surface of the fixed tube.

[0069] Furthermore, the protective fence according to the present invention is not limited to being installed on a median strip, but may be installed at the side of a road on which vehicles pass. In this case, it is preferable that the positioning portion positions the horizontal position of the insertion pipe in a position close to the part of the pipe wall of the fixed pipe that is closer to the road. In this way, a larger distance can be secured for the horizontal movement of the insertion pipe in the space within the fixed pipe when a vehicle collides with the protective fence body from the road, and the protective fence's ability to absorb the vehicle collision energy can be further improved.

[0070] In the above embodiment, the protective fence has a first upper beam and a first lower beam arranged vertically and a second upper beam and a second lower beam arranged vertically, but the protective fence may also have a single first beam and a single second beam.

[0071] Furthermore, the protective fence body is not necessarily limited to one that can be moved on the ground by the rolling elements shown in the above embodiment. For example, the protective fence body of the present invention may not have rolling elements and may be one that is installed by being placed on the ground at the installation location, or one that can be moved on the ground by being dragged or pushed along the ground or lifted off the ground. [Explanation of symbols]

[0072] 1 Protective fence 2 Protective fence body 3 Fixing device 8 strut tube 10 First beam (Road side beam, Anti-road side beam) 12 Second beam (Road side beam, Anti-road side beam) 30 Fixed tube 30a 1st opposing part (fixed pipe opposing part) 30b 2nd opposing part (fixed pipe opposing part) 32 Insert pipe 32d 1st opposite side of road (insertion pipe opposite side of road) 32e 2nd anti-road side section (insertion pipe anti-road side section) 42 Positioning part 44 Top plate 44a Insertion hole 48 Movement restriction protrusion

Claims

1. A protective fence that is installed at a location adjacent to a road on which vehicles travel and that receives a vehicle when the vehicle deviates from the road, A protective fence body that is installed on the ground at the installation location so as to be movable from the installation location; A fixing device for fixing the protective fence body at the installation location, The protective fence body has a support pipe extending in the vertical direction, The fixing device includes a fixing pipe that is embedded in the ground at the installation site in a vertically extending position, an insertion pipe that is inserted into a space within the support pipe and a space within the fixing pipe so as to span these spaces and connect the support pipe and the fixing pipe, and a positioning portion that determines a horizontal position of the insertion pipe in the space within the fixing pipe, the fixed pipe has an inner diameter capable of securing a gap between an outer circumferential surface of the insertion pipe inserted into a space within the fixed pipe and an inner circumferential surface of the fixed pipe, the positioning portion is configured to position the horizontal position of the plug-in pipe in a direction perpendicular to the extension direction of the road at a predetermined position where a gap is formed between a plug-in pipe anti-road side portion, which is a portion of the outer circumferential surface of the plug-in pipe inserted into the space within the fixed pipe that faces away from the road, and a fixed pipe opposing portion, which is a portion of the inner circumferential surface of the fixed pipe that faces the plug-in pipe anti-road side portion, and is configured to allow the plug-in pipe to move horizontally due to the collision load of the vehicle when a vehicle collides with the protective fence main body from the road to a position where the plug-in pipe anti-road side portion abuts against the fixed pipe opposing portion, the positioning portion includes a top plate portion having an insertion hole through which the insertion tube is inserted and installed on the upper end portion of the fixed tube, which positions the horizontal position of the insertion tube inserted into the insertion hole at the predetermined position, and a movement restricting protrusion that protrudes downward from the top plate portion into the space within the fixed tube at a position outside the insertion hole and radially inside the fixed tube, and abuts against an inner circumferential surface of the fixed tube to restrict horizontal movement of the top plate portion, The movement-restricting protrusion has a strength that allows it to deform when it comes into contact with the fixed tube so as to allow the insertion tube and the top plate portion to move horizontally to the side opposite the road due to the collision load of a vehicle when the vehicle collides with the protective fence main body from the road.

2. The installation location where the protective fence is installed is a median strip located between a first road and a second road, The plug-in pipe opposite-road side portion includes a first opposite-road side portion that faces the opposite side to the first road and a second opposite-road side portion that faces the opposite side to the second road, the fixed pipe opposing portion includes a first opposing portion that is an opposing portion to the first opposite-road-side portion and a second opposing portion that is an opposing portion to the second opposite-road-side portion, The protective fence of claim 1, wherein the positioning portion is configured to position the horizontal position of the insertion pipe at a predetermined position where a gap is formed between the first anti-road side portion of the insertion pipe and the first opposing portion of the fixed pipe and where a gap is formed between the second anti-road side portion of the insertion pipe and the second opposing portion of the fixed pipe, and is configured to allow the insertion pipe to move horizontally to a position where the first anti-road side portion abuts against the first opposing portion due to the collision load of the vehicle when a vehicle collides with the protective fence main body from the first road, and to allow the insertion pipe to move horizontally to a position where the second anti-road side portion abuts against the second opposing portion due to the collision load of the vehicle when a vehicle collides with the protective fence main body from the second road.

3. The protective fence body includes a road side beam that faces the road and is disposed so as to extend along the road at a position on the road side relative to the support pipe when the protective fence body is installed at the installation location, and a road side beam that faces the road and is disposed so as to extend along the road at a position on the road side relative to the support pipe when the protective fence body is installed at the installation location. Further, the anti-road side beam is disposed so as to extend along the road at a position opposite to the road side beam, 3. The protective fence of claim 1 or 2, wherein the insertion length of the plug-in pipe into the space within the fixed pipe, the difference between the inner diameter of the fixed pipe and the outer diameter of the plug-in pipe, and the distance from the lower end of the anti-road side beam to the ground at the installation location are set so that, when a vehicle collides with the protective fence main body from above the road, the plug-in pipe and the protective fence main body move horizontally to a position where the anti-road side portion of the plug-in pipe abuts against the opposing portion of the fixed pipe, and then the plug-in pipe and the protective fence main body tilt away from the road so that the lower end of the plug-in pipe abuts against the portion of the inner surface of the fixed pipe that faces the road and a portion upwardly from the lower end of the plug-in pipe abuts against the upper end of the opposing portion of the fixed pipe, and then the plug-in pipe bends and deforms, causing the protective fence main body to tilt further away from the road until the lower end of the anti-road side beam contacts the ground at the installation location.

4. The protective fence according to claim 3 , wherein the distance from the lower end of the anti-road side beam to the ground at the installation location is set to be greater than the difference between the inner diameter of the fixed pipe and the outer diameter of the insertion pipe.

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