JP2018115420A - Guard fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guard fence to be installed on a structure or mountain slope to catch falling rocks and the like, which is also capable of reducing a load that acts on a support post and of decreasing the amount of ground area required for said guard fence.SOLUTION: A guard fence composed of a net 50 stretched between a plurality of support posts 20 erected at prescribed intervals, wherein each support post comprises a base 22 arranged on a surface of an erected foundation and fixed to said surface, and a support post body 24 which extends upwards so as to be set apart from the base. On the side opposite to the base foundation, provided is a cushioning material 36 that is held between the base and an anchorage body 33 attached to an anchor 32 embedded in the foundation and is capable of absorbing an external force received from the base.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a protective fence installed on a ground such as a structure or a slope in order to capture rocks.

  Conventionally, protective fences have been installed on mountain slopes to protect adjacent roads, railways and houses from natural disasters such as rockfalls, landslides, and avalanches. Particularly in Japan, where earthquakes occur frequently, falling rocks and landslides frequently occur on slopes due to earthquakes, so it is extremely important to install protective fences and take measures against disasters.

  Such a protective fence generally includes a plurality of support columns standing on a structure or a slope, and a net extending between the support columns. For example, in the protective fence described in Patent Document 1, a net is stretched between a plurality of upright columns, and each column is composed of a columnar body extending linearly, and its base is embedded in the ground. Established.

  Further, the protective fence described in Patent Document 2 includes a plurality of upright columns, a net stretched between the columns, and a plurality of holding ropes and holding members that support the columns. In this protective fence, the column is tiltably attached to the base fixed to the slope via a hinge without embedding the column. In addition, each strut is prevented from tilting to the valley side by a holding rope stretched from the upper end of the strut toward the slope of the mountain, and a high-rigid retainer extending from the upper end of the strut toward the mountain side The tilt to the slope side is prevented. The stay rope is provided with a shock absorber capable of absorbing impact force.

JP 2012-117361 A JP 2003-105721 A

  In the protective fence described in Patent Document 1, when an impact force is applied to the protective fence due to falling rocks or the like, the impact force can be absorbed by the elongation of the net.

  However, the impact force that has not been absorbed by the net is transmitted to the support column, and this impact force and the drag force from the surrounding ground that resists the impact force act on the support column. If a large impact force is applied, the load applied to the support will be great, and the support will not be able to withstand the load and will be plastically deformed, or the support will tilt and the ground and retaining walls supporting it will collapse. There was a problem that.

  On the other hand, in the protective fence described in Cited Document 2, when impact force is applied due to falling rocks, etc., the net is extended to absorb the impact force, and the support rope is supported by tilting the support column by the hinge. The impact force can be absorbed by the shock absorber attached to the holding rope. Thereby, the load which acts on a support | pillar can be reduced and a deformation | transformation of support | pillar itself can be suppressed.

  However, in the guard fence described in the cited document 2, it is necessary to arrange a holding rope and a holding material for each pillar in order to support the pillar, and the site area required for the guard fence increases.

  This invention is made in view of the said subject, Comprising: It is a protective fence installed in the grounds, such as a road structure and a slope of a mountain, in order to capture a fall rock etc., and reduces the load which acts on a support | pillar An object of the present invention is to provide a protective fence that can reduce the land area required for the protective fence.

In order to achieve the above object, the protective fence according to claim 1 is:
A protective fence in which a net is stretched between a plurality of support columns set up at predetermined intervals,
The column has a base that is arranged on the surface of the ground to be erected and fixed to the surface, and a column main body that extends upward so as to be separated from the ground,
On the opposite side of the ground to the ground, a cushioning material disposed between the base and a fixing body attached to an anchor embedded in the ground and capable of absorbing an external force received from the base is provided. It is characterized by.

  According to this configuration, when an impact force acts on the protective fence due to falling rocks, etc., the impact force can be absorbed by the elongation of the net, and the external force that tilts the column, that is, the impact force due to falling rocks, etc. The resistance from the opposing slope can be transmitted from the base to the buffer material and absorbed by this buffer material. Thereby, the load which acts on a support | pillar is reduced and the bending and deformation | transformation of a support | pillar can be suppressed. In addition, since the support column is erected by fixing the base to the surface of the ground, it is possible to eliminate the need for a holding rope or holding material for supporting the support column, and to suppress the site area required for the protective fence. .

The protective fence according to claim 2 is the protective fence according to claim 1,
The base is fixed to the ground by a fixing member disposed below the cushioning material.

  According to this configuration, when an impact force is applied to the support column due to falling rocks or the like, the support column rotates around the portion fixed by the fixing member so that the portion above this tilts toward the valley side. Therefore, the external force that moves the base in the direction away from the ground, that is, the external force that tilts the column can be efficiently absorbed by the cushioning material disposed above the fixing member.

The protective fence according to claim 3 is the protective fence according to claim 1 or 2,
The base portion extends in the vertical direction along the ground.

  According to this configuration, since the slope can be reinforced by the base portion extending in the vertical direction on the slope, the stability of the slope is improved.

The protective fence according to claim 4 is the protective fence according to claim 3,
The support column is erected on a retaining wall having a slope and a horizontal plane formed at the upper end of the slope,
The lower end surface of the column main body is opposed to and in contact with the horizontal plane, and the base portion extends in the vertical direction along the ground from the lower end portion of the column main body.

  According to this structure, the standing state of a support | pillar is stabilized because the lower end surface of a support | pillar body opposes and contacts the horizontal surface of a retaining wall. Moreover, since the retaining wall is reinforced by the base of the support column, falling rocks and the like can be prevented while protecting the retaining wall.

The protective fence according to claim 5 is the protective fence according to any one of claims 1 to 4,
An area extending member is provided on the base and extends an area of contact with the ground.

  According to this configuration, the ground contact area can be increased by the area expanding member, so that the stability of the ground surface is improved.

The protective fence according to claim 6 is the protective fence according to any one of claims 1 to 5,
The anchor is embedded in the ground so as to penetrate the cushioning material and the base.

  According to this configuration, the base portion can be fixed to the ground by the anchor for attaching the cushioning material. In addition, when an impact force acts on the protective fence due to falling rocks, etc., external forces such as impact force and drag force acting on the column are transmitted from the base of the column to the buffer material attached to the anchor bolt and absorbed by this buffer material. be able to.

The protective fence according to claim 7 is the protective fence according to any one of claims 1 to 6,
The cushioning material is a disc spring or a rubber bearing.

  According to this configuration, the base portion can be fixed by pressing the base portion toward the inclined surface by the urging force of the disc spring or the rubber bearing at a normal time when no impact force is applied. Further, when an impact force is generated, the impact energy transmitted from the base portion can be absorbed by a disc spring or a rubber bearing.

  According to the protective fence of the present invention, since the impact force acting on the column and the drag force from the slope can be transmitted and absorbed by the buffer mechanism provided on the column, the load acting on the column can be reduced. Thereby, bending and deformation | transformation of a support | pillar can be suppressed. In addition, since it is possible to eliminate a holding rope and a holding material that support the support column, it is possible to suppress a site area necessary for the protective fence. Moreover, since it can be easily installed on an existing road structure or a slope, it can be suitably used when a protective fence is newly installed on the existing structure or when an existing protective fence is reinforced.

The front view which shows typically the protection fence of the 1st Embodiment of this invention. The side view of the protection fence shown in FIG. It is a figure which shows the rubber bearing which is an example of a shock absorbing material, (a) is a top view of a rubber bearing, (b) is sectional drawing which follows the IIIb-IIIb line | wire of (a). It is a figure which shows the disk spring which is another example of a buffer material, (a) is a perspective view of a disk spring, (b) is sectional drawing which follows the IVb-IVb line | wire of (a). Sectional drawing of the principal part of a protection fence. The perspective view of the net used for a protection fence. The side view explaining the falling rock capture behavior of a protective fence. The front view which shows typically 2nd Embodiment of a protection fence. The side view of the protection fence shown in FIG. The principal part enlarged side view of a guard fence. The side view explaining the falling rock capture behavior of a protective fence. The side view which shows other embodiment of a protection fence.

(First embodiment)
FIG. 1 is a front view of a guard fence 10 according to the first embodiment of the present invention, and FIG. 2 is a side view thereof. The protective fence 10 includes a plurality of support columns 20-1 to 20-4, buffer mechanisms 30-1 to 30-4 attached to the support columns, and a net 50 stretched between the support columns 20. In addition, although the four support | pillars 20-1 to 20-4 are described in the example of illustration, the number of the support | pillar 20 is not restricted to this, What is necessary is just two or more.

  Each of the columns 20-1 to 20-4 has a base 22 fixed to a slope 90 of a mountain serving as a ground, and a column main body 24 extending from the base 22 in a direction standing with respect to the slope 90. In the present invention, the ground means a foundation that can stand the support column 20 and includes not only a natural ground (mountain) forming a mountain but also a structure such as a retaining wall. It is a concept. Each of the base portion 22 and the column main body 24 is a columnar body extending in a straight line having substantially the same cross section, and is a steel pipe having a substantially rectangular cross section in the present embodiment. One end of the column main body 24 is welded to one end of the base 22, and the column 20 is formed in a dogleg shape that is bent at the joint portion between the base 22 and the column main body 24 as a whole. Yes. The joint strength between the base portion 22 and the column main body 24 is enhanced by welding the plate-shaped reinforcing material 29 to each other.

  The support column 20 is installed such that the base portion 22 is disposed on the inclined surface 90, extends in the vertical direction along the inclined surface 90, and the support column main body 24 extends from the upper end portion of the base portion 22. The support column 20 is fixed to the inclined surface 90 by a buffer mechanism 30 attached through a through hole 22 a formed in the base portion 22.

  In addition, the cross-sectional shape of the base 22 and the support | pillar main body 24 is not restricted to a tetragon | quadrangle, Other polygonal shape and circular shape may be sufficient. Further, the base 22 may be a shape other than a columnar shape, for example, a flat steel plate having a width larger than that of the column main body 24. In addition, the column main body 24 may not be extended from one end portion of the base portion 22, but may be extended from the central portion of the base portion 22, for example.

  The shock-absorbing mechanism 30 is provided at the base portion 22 of the support column 20, and when an external force that tilts the support column is applied to the support column, a function of absorbing the external force, for example, an impact received by the support column 20 due to falling rocks, Has the function of absorbing power. The buffer mechanism 30 of the present embodiment further has a function of fixing the support column 20 to the inclined surface 90. The buffer mechanism 30 includes a fixture 31 that restricts the movement of the base portion 22 with respect to the inclined surface 90, and a buffer material 36 attached to the fixture 31.

  The fixing tool 31 is inserted into the through hole 22a of the base 22 and the base 22 and the cushioning material 36 are interposed between the anchor bolt (anchor) 32 embedded in the ground and the inclined surface 90, so that the ground of the anchor bolt 32 can be obtained. And a nut (fixing body attached to an anchor) 33 to be screwed to the end portion on the side.

  The cushioning material 36 has elasticity and is disposed on the opposite side of the inclined surface 90 with respect to the base 22 in the installed state, and absorbs external force such as impact force received from the base 22. The cushioning material 36 of the present embodiment is substantially cylindrical, has elastic stretchability at least in the axial direction, and has a through hole 36a penetrating in the axial direction at the center.

  FIG. 3 shows a rubber bearing which is an example of the cushioning material 36. This rubber bearing includes a cylindrical laminated rubber body in which steel plates 70-1 to 70-5 and plate-like rubber materials 72-1 to 72-4 are alternately stacked, and a covering rubber 74 that covers the periphery of the laminated rubber body. And has a through hole 36a at the center.

  As another example of the buffer material 36, as shown in FIG. 4, a disc spring having a plurality of pieces stacked in the axial direction and having a circular hole in the center can be used. The disc spring is preferably used in a state where the outer peripheral surface is covered with a coating material (not shown). The buffer material 36 is not limited to this, and may be any material that can absorb an external force such as an impact force received from the base 22 in the installed state.

  As shown in FIG. 5, the cushioning material 36 is attached between the base portion 22 and the nut 33 so as to be elastically contractible in a state where the anchor bolt 32 is inserted into the through hole 36 a. In the illustrated example, a rubber bearing is used as the buffer material 36. A washer 35 is disposed between the base 22 and the cushioning material 36, and the base 22 is pressed and fixed to the slope 90 side via the washer 35 by the elastic biasing force of the cushioning material 36.

  The plurality of struts 20 are erected at substantially the same height of the mountain slope 90 at a predetermined interval to constitute one strut row. Support ropes 60-1 and 60-2 that extend to the outside of the support column are stretched around the support columns 20-1 and 20-4 positioned at both ends of the support column. One end of each of the support ropes 60-1 and 60-2 is connected to the upper ends of the columns 20-1 and 20-4, and the other end is connected to an anchor 64 embedded in the inclined surface 90 outside the column of columns. In addition, description of the support rope 60-2 is abbreviate | omitted in the side view shown in FIG.2 and FIG.7.

  The height of the columns 20 in the installed state (that is, the height of the column main body 24) is generally about 2 m to 5 m, and the interval between adjacent columns 20 is about 2 m to 8 m. These dimensions can be appropriately selected depending on the scale and situation of the slope to be installed.

  As shown in FIG. 6, the net 50 is a net made of a wire made of steel wire (for example, a wire made by twisting a plurality of high-strength hard steel wires, etc.), and has a mesh size different from each other. The net 51 and the second net 52 are included. The first net 51 has a mesh larger than that of the second net 52, and these nets 51 and 52 are stretched on the support column 20 in a state of being overlapped.

  An upper support rope 54 and a lower support rope 55 are horizontally mounted on the column, and a vertical support rope (not shown) extending along the column body 24 is stretched on the column body 24 of each column 20. ing. The net 50 is stretched around the column 20 via an upper support rope 54, a lower support rope 55, a vertical support rope, and a coiled spring member 58 wound around these support ropes.

  Next, the effect | action of the guard fence 10 mentioned above based on FIG. 7 is demonstrated. In addition, in FIG. 7, the inclination state of the support | pillar 20 by impact force is exaggeratedly displayed.

  When the falling rock 96 collides with the net 50 of the protective fence 10, the net 50 expands and the impact force is absorbed. Further, a frictional force is generated between the first net 51 and the second net 52 stretched in an overlapped state, so that the collision energy is attenuated.

  Further, due to the impact force transmitted to the column 20 through the net 50, the column 20 moves so that the column body 24 tilts toward the valley side. At this time, the movement of the support column 20 is restricted by the fixture 31 of the buffer mechanism 30, and the shock force is alleviated by the elastic contraction of the buffer material 36 attached to the fixed portion 31.

  In addition, since both sides of the support column are pulled outward in the width direction by the support ropes 60-1 and 60-2, it is possible to prevent each support column 20 from tilting toward the inside of the support column toward the falling rock collision position. Can do.

  Thus, when the impact force is applied to the protective fence 10, the impact force can be reduced by the net 50, and the impact force can be reduced by the buffer mechanism 30 provided on the support column 20. Thereby, the load which acts on the support | pillar 20 is reduced and the bending and deformation | transformation of the support | pillar 20 can be suppressed.

  In the normal state where no impact force is applied, the support column 20 is stably fixed by the base portion 22 being pressed toward the inclined surface 90 by the elastic biasing force of the cushioning material 36. As described above, since the support column 20 can be fixed on the inclined surface 90 by the buffer mechanism 30, the support column is supported for each support column like a conventional protective fence standing on the ground via a hinge. There is no need to install a holding rope or holding material, and the land area required for the protective fence can be reduced. Furthermore, since the surface of the slope 90 is pressed by the base 22 in the normal state, the slope 90 can be stabilized.

  Further, since the external force acting on the support column 20 is relieved by the elastic stretchability of the cushioning material 36 provided on the base 22, for example, the load due to snow on the protective fence 10 (the load change with time rather than the impact load such as falling rocks) Even when a small static load) is applied, breakage and deformation of the support column 20 can be accurately prevented to prevent snow damage. The installation mode of the cushioning material 34 is not limited to that described above, and the external force received from the base 22 is restricted by the movement of the cushioning material 34 with respect to the ground by the fixing body attached to the anchor embedded in the ground. As long as the cushioning material 34 can exhibit an elastic force so as to be able to absorb water.

(Second Embodiment)
FIG. 8 is a front view showing a second embodiment of the protective fence 10, and FIG. 9 is a side view of the protective fence 10 shown in FIG. 8 to 11, the same reference numerals are given to the portions corresponding to the first embodiment. In the second embodiment described below, detailed description of the same configuration as that of the first embodiment is omitted. In addition, description of the support rope 60-2 and the space | interval holding member 45 mentioned later is abbreviate | omitted in the side view shown in FIG.9 and FIG.11.

  The protective fence 10 according to the present embodiment is installed on an existing retaining wall (road structure) 91. The retaining wall 91 can be a known structure such as a reinforced concrete retaining wall, a concrete block retaining wall, or a masonry retaining wall. The retaining wall 91 has an inclined surface 91b and an upper surface 91a that is a horizontal surface formed at the upper end of the inclined surface 91b.

  The protective fence 10 includes a plurality of support columns 20-1 to 20-4, fixing members 40-1 to 40-4 that fix the support columns 20 to the retaining wall 91, and an interval holding member 45 that holds an interval between the adjacent support columns 20. And buffer mechanisms 30-1 to 30-4 attached to the respective struts 20 and a net 50 stretched between the struts 20. The support column 20 includes a base portion 22 fixed to the retaining wall 91 and a support column main body 24 extending from the base portion 22 in a direction standing with respect to the retaining wall 91, and each of the support columns 20-1 to 20-4. Area expansion members 48-1 to 48-4 are attached to the base 22.

  The base 22 and the column main body 24 of the column 20 are each a columnar body extending linearly, and the column 20 is formed in a dogleg shape that is bent at the coupling portion between the base 22 and the column body 24 as a whole. ing. The lengths of the base 22 and the column main body 24 can be appropriately set. In the present embodiment, the base 22 and the column main body 24 are set to have substantially the same length. A reinforcing material 29 is welded and joined to the joint between the base 22 and the column main body 24.

  As shown in FIGS. 9 and 10, a grounding portion 25 is provided at the lower end portion of the columnar body constituting the column main body 24 (that is, the end portion on the side coupled to the base portion 22). The grounding portion 25 is formed of a flat steel plate joined to the end portion of the steel pipe constituting the column main body 24. With this grounding portion 25, the lower end surface (grounding surface) 25 a of the column main body 24 is formed in a planar shape that can come into surface contact with the upper surface 91 a of the retaining wall 91.

  The support column 20 has a base 22 disposed on the slope 91b of the retaining wall 91 and extends in the vertical direction along the slope 91b. They are in contact with each other, and the column main body 24 is installed so as to extend upward from the upper surface 91a. The base portion 22 of the support column 20 is fixed to the retaining wall 91 via the area expanding member 48 by the fixing member 40 and the buffer mechanism 30. In addition, the grounding part 25 is not fixed with respect to the upper surface 91a, and is in a state of riding on its own weight.

  The area expanding member 48 increases the ground contact area with respect to the retaining wall 91 and is a flat plate-like member disposed between the base portion 22 and the inclined surface 91b, and the fixing member 40 and / or the buffer mechanism together with the base portion 22. 30 to the retaining wall 91. As such an area expansion member 48, a flat steel plate can be used, for example.

  The size of the area expanding member 48 (the size of the ground contact area with respect to the retaining wall 91) can be set as appropriate depending on the size of the base portion 22, the interval between adjacent struts 20, and the like. In the present embodiment, the length dimension L of the area expansion member 48 is substantially the same as the length dimension of the base portion 22, and the width dimension W of the area expansion member 48 is equal to the width dimension of the base portion 22 (that is, the base portion 22. The outer diameter dimension) is set larger than the outer diameter dimension, and in the installed state, the area expanding member 48 covers almost the entire lower surface of the base portion 22 (the surface facing the retaining wall 91) and is wider than both side edges of the base portion 22. Projects outward in the direction.

  The fixing member 40 penetrates through the through hole formed in the base portion 22 and the through hole formed in the area expanding member 48, and is screwed into the anchor bolt 42 and screwed into the anchor bolt 42, with the washer 44 interposed therebetween. And a nut 43 for fixing the base portion 22. The fixing member 40 is attached below the buffer mechanism 30 at the base 22.

  The structure of the buffer mechanism 30 is the same as that of the first embodiment, and its installation mode is the same as that of the first embodiment except that the area expanding member 48 is interposed between the base portion 22 and the inclined surface 91b. Therefore, the description is omitted here.

  An interval holding member 45 that holds the interval between the columns 20 at a predetermined interval is disposed between adjacent bases 22 in the column. The spacing member 45 is a rod-shaped member that extends along the direction in which the columns 20 are arranged.

  Next, the effect | action of the guard fence 10 mentioned above based on FIG. 11 is demonstrated. In FIG. 11, in order to easily understand the force acting on the support column 20 and the buffer mechanism 30, the inclined state of the support column 20 due to the impact force of the falling rock 96 is displayed in an exaggerated manner.

  When the falling rock 96 collides with the net 50 of the protective fence 10, the net 50 expands and the impact force is relaxed, and a frictional force is generated between the first net 51 and the second net 52, thereby collision energy. Is absorbed.

  The support column 20 rotates so that the support column main body 24 tilts to the valley side with the fixing point by the fixing member 40 as the rotation center by the impact force transmitted through the net 50 and the drag force from the inclined surface 91b. At this time, the strut 20 is restricted from rotational movement by the fixture 31 of the buffer mechanism 30, and the shock force is alleviated by the elastic contraction of the buffer material 36 attached to the fixed portion 31.

  In this way, by reducing the impact force by the buffer mechanism 30 provided on the support column 20, the load acting on the support column 20 is reduced, and the bending and deformation of the support column 20 can be suppressed. Further, by setting the fixing point of the support column 20 with the fixing member 40 and providing the buffer mechanism 30 above the fixed point, the external force for moving the base portion 22 away from the inclined surface by the buffer mechanism 30 is efficiently reduced. Can be made.

  Furthermore, since the column main body 24 is placed on the upper surface 91a of the retaining wall 91 from above in a normal state where no impact force is applied, the column 20 is stable in the standing state. Further, the support column 20 is firmly fixed to the inclined surface 91b by the fixing member 40, and is fixed to the inclined surface 91b by the buffer mechanism 30 so as to be swingable. Therefore, the stability of the standing state of the support column 20 is improved. While improving, the load which acts on the support | pillar 20 can be reduced.

  Such a protective fence 10 is preferably installed particularly when repairing the existing retaining wall 91. That is, in the protective fence 10, the base 22 fixed on the retaining wall 91 presses the slope 91 b of the retaining wall 91, thereby reinforcing the retaining wall 91 and preventing the retaining wall 91 from collapsing. In addition, the retaining wall 91 can be more effectively protected by ensuring a large ground contact area with the retaining wall 91 by the area expanding member 48.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, one buffer mechanism 30 is provided for one column 20, but a configuration in which a plurality of buffer mechanisms 30 are provided may be used.

  Further, as shown in FIG. 12, the column 20 is not limited to the inclined surface, and the base 22 may be fixed to the vertical surface 91c of the vertical retaining wall serving as the ground. In this case, the support column 20 can be a linear columnar body so that the base 22 and the support column main body 24 extend in the vertical direction. As described above, the protective fence according to the present invention may be installed on the ground such as a structure or a mountain slope in order to protect against disasters such as falling rocks, landslides, and avalanches. Further, since the protective fence 10 according to the present invention fixes the support column 20 to the surface of the ground and can be easily installed, when the protective fence 10 is newly installed on an existing structure, FIG. As shown in the figure, it can be used particularly suitably when the protective fence 10 is newly installed to reinforce the existing protective fence 80 (for example, a conventional protective fence in which the support column 81 is buried in the ground).

DESCRIPTION OF SYMBOLS 10 Protective wall 20 Prop 22 Base 24 Prop main body 30 Buffer mechanism 32 Anchor bolt (anchor)
33 Nut (fixing body)
36 Buffer material 40 Fixing member 45 Spacing member 48 Area expansion member 50 Net 51 First net 52 Second net 90 Slope 91 Retaining wall 91a Retaining wall upper surface (horizontal plane)
91b Retaining wall slope

Claims (7)

A protective fence in which a net is stretched between a plurality of support columns set up at predetermined intervals,
The column has a base that is arranged on the surface of the ground to be erected and fixed to the surface, and a column main body that extends upward so as to be separated from the ground,
On the opposite side of the ground to the ground, a cushioning material disposed between the base and a fixing body attached to an anchor embedded in the ground and capable of absorbing an external force received from the base is provided. Guard fence characterized by.   The protective fence according to claim 1, wherein the base is fixed to the ground by a fixing member disposed below the cushioning material.   The protective fence according to claim 1, wherein the base portion extends in a vertical direction along the ground. The support column is erected on a retaining wall having a slope and a horizontal plane formed at the upper end of the slope,
The lower end surface of the column main body is opposed to and in contact with the horizontal plane, and the base portion extends vertically from the lower end portion of the column main body along the ground. The protective fence described.   The protective fence according to any one of claims 1 to 4, further comprising an area expansion member that is provided at the base and expands a ground contact area with respect to the ground.   The protective fence according to any one of claims 1 to 5, wherein the anchor is embedded in the ground so as to penetrate the cushioning material and the base.   The protective fence according to any one of claims 1 to 6, wherein the cushioning material is a disc spring or a rubber bearing.

Images