JP7421835B1 - protective fence - Google Patents

Abstract

An object of the present invention is to provide a protective fence having a blocking surface with a small amount of bending deformation while allowing the penetration of fallen objects when receiving a blow. [Solution] A protective fence comprising a plurality of columns and a blocking surface provided between the above-ground parts of adjacent columns, the barrier having a highly rigid transparent type blocking surface between the above-ground parts of the adjacent columns. The rigid blocking surface captures the falling objects, and the structure allows part of the falling objects to pass through the horizontal slits formed in the rigid blocking surface. [Selection diagram] Figure 1

Description

The present invention relates to a protective fence that catches fallen objects such as fallen earth and sand, avalanches, and falling rocks.

Patent Document 1 discloses a protective fence for falling earth and sand that includes a plurality of supports and a protective net made of rope that is hung horizontally between adjacent supports.
This protective fence has a structure that absorbs the impact force of the fallen earth and sand and captures the earth and sand by bending and deforming the protective net.

Patent Document 2 discloses a protection fence that improves the ability to capture fallen earth and sand in the lower half of the protection surface.
This protective fence has a band-shaped concrete wall above the ground, and the lower part of the support is penetrated through this wall and also into the ground, and the support is erected and protrudes upward from the wall. The structure is such that a protective net is attached to the above-ground part of the pillar.
In this protection fence, when the wall body formed in the lower half of the protection surface receives and captures the fallen earth and sand, the pillars function as support piles.
Furthermore, a protective net formed on the upper half of the protective surface can catch falling rocks and the like.

Patent Document 3 discloses that a wall is composed of a plurality of blocks of earth.
An earth block is a cube-shaped earth block made by filling a bag with filling material such as earth and sand.
The construction method is to stack multiple earth blocks on the ground to form a wall, and then erect the pillar by penetrating the lower part of the pillar through the multiple earth blocks and into the ground. A protective net will be attached to the above-ground part of the pillar that protrudes upward.

JP2022-105948A Japanese Patent Application Publication No. 2014-101699 Japanese Patent Application Publication No. 2008-121264

Protective fences equipped with rope protective nets have the following points to be improved.
<1> When capturing fallen earth and sand, the rope protective net undergoes a large bending deformation toward the slope valley side.
Therefore, if there are objects to be protected such as roads, railways, or houses nearby, a protective fence must be installed at a location separate from the objects to be protected.
<2> It is necessary to secure a site that includes the deformation range of the protective net, which increases the cost of acquiring the site.
<3> At sites where it is difficult to secure land that would accommodate the deformation range of the protective net, the installation of protective fences equipped with rope protective nets may be postponed.

Protective fences equipped with walls have the following points to be improved.
<1> In order to construct a concrete wall, heavy machinery must be used, resulting in high construction costs.
<2> In a site where the installation surface of the wall has a slope or uneven inclination, the concrete wall cannot follow the slope or inclination of the installation surface.
Therefore, it is necessary to level the installation surface, which requires a lot of time and effort to construct the wall.
<3> Since the wall has a water-blocking function, there are problems such as a large amount of water accumulating at the foot of the protective fence and difficulty in draining trapped earth and sand.
<4> Since the wall is made of concrete, if the wall is cracked or damaged due to impact, the cost of replacing the wall will be high.

The object of the present invention has been made in view of the above-mentioned problems, and the object thereof is to provide a protective fence that allows the penetration of fallen objects when receiving a hit, while forming a blocking surface with a small amount of bending deformation. It's about doing.
A further object of the present invention is to provide a protective fence that can solve the above-mentioned problems.

The present invention provides a plurality of pillars that are erected by burying the buried parts of the pillars in the installation surface at intervals, and a rigid blocking surface with a very small amount of deflection deformation provided between the above-ground parts of the adjacent pillars. A protective fence comprising a flexible plastic blocking surface provided above the rigid blocking surface, and traps falling objects such as fallen earth and sand, an avalanche, and falling rocks through the rigid blocking surface and the plastic blocking surface, The rigid blocking surface is provided with a plurality of horizontal slits that allow some of the fallen objects to pass through, thereby forming a transparent rigid blocking surface.
In another aspect of the present invention, the transmission-type rigid blocking surface is constituted by a plurality of cross beams, and continuous band surfaces are formed on the side surfaces of the cross beams.
In another aspect of the invention, a connecting device is rotatably mounted on the above-ground part of the support, and the connecting device and the end of the cross beam are pivotally supported by a horizontal support shaft to form a pin connection. .
In another embodiment of the present invention, the plurality of cross beams may be removably installed horizontally between the above-ground parts of adjacent supports.
In another form of the invention, the cross beam is made of concrete-filled steel pipe.
In another embodiment of the invention, the plastic blocking surface is made of rope or net, or is a protective net made of a combination of rope and net.

The present invention has at least one of the following effects.
<1> By horizontally suspending a plurality of cross beams at intervals between the ground parts of adjacent pillars, it is possible to form a rigid blocking surface with a small amount of bending deformation when receiving a hit.
Therefore, even at a site where objects to be protected, such as roads, railways, and houses, exist in the vicinity of the guard fence, it is possible to install the guard fence at a position close to the object to be protected.
<2> Since the rigid blocking surface exhibits a transparent structure having a plurality of horizontal slits, the kinetic energy of the fallen object can be efficiently attenuated when the fallen object passes through the horizontal slits when being hit.
Therefore, not only the load burden on the transparent type rigid blocking surface can be reduced, but also the load burden on the pillars supporting the transparent type rigid blocking surface can be reduced.
<3> By selecting the opening size of the horizontal slit in the rigid blocking surface, the buffering performance of the transparent rigid blocking surface can be adjusted.
<4> Since the rigid blocking surface has a permeable structure, rainwater can naturally drain downstream even if debris accumulates on the upstream side of the blocking surface.
Therefore, there is no need to provide special wastewater treatment facilities at the protective fence.
<5> The end of the cross beam and the column can be pivoted about the column, and the cross beam can be connected to the column so as to be rotatable in the lateral direction and the vertical direction using a pin connection.
Therefore, you can install a protective fence with any curvature, and even if the installation surface of the protective fence has an uneven slope or inclination, you can install cross beams without being affected by the slope or inclination of the installation surface. can do.
<6> By configuring the cross beams that make up the rigid blocking surface of the transparent type to be removable, it is possible to not only efficiently remove fallen debris such as collapsed earth and sand that has accumulated on the upstream side of the rigid blocking surface of the transparent type, but also to prevent damage. Repairs are easy as only the damaged cross beams can be replaced with new ones.
<7> Since the cross beams can be transported by workers, the transparent rigid blocking surface can be easily constructed by assembling the cross beams only by hand without using heavy machinery.
<8> By providing a plastic prevention surface above the transparent type rigid prevention surface, it is possible to efficiently trap fallen soil with the transparent type rigid prevention surface, and also to efficiently trap falling rocks with the plastic prevention surface. This allows a single protective fence to capture multiple types of fallen objects.
<9> If a falling object such as a falling rock falls beyond the installation height of the transparent type rigid prevention surface, the plastic prevention surface installed above the transparent type rigid prevention surface will perform the function of catching the falling rock, etc. do.

A front view of the protective fence according to Embodiment 1 of the present invention with some parts omitted Assembly diagram of the transparent rigid blocking surface that makes up the protective fence Perspective view of the cross beam and coupling device that constitute the transparent rigid blocking surface These are explanatory diagrams of the plasticity prevention surface, where (A) is a plan view of the connection between the horizontal rope and the strut, and (B) is a side view of the connection between the horizontal rope and the strut. Explanatory diagram of how to construct a protective fence Explanatory diagram of the receiving action on the rigid blocking surface and plastic blocking surface of the transparent type A front view of a protective fence according to Example 2 of the present invention with some parts omitted

Embodiments of the present invention will be described below with reference to the drawings.

[Example 1]
<1> Outline of the protective fence The protective fence according to the present invention is a protective fence for avalanche prevention, falling earth and sand, or falling rocks.
To explain the protective fence illustrated in FIG. 1, this protective fence consists of a plurality of columns 10 erected on the installation surface G at predetermined intervals, and a transparent rigid blocking surface horizontally suspended between the plurality of columns 10. 30, and a plastic blocking surface 40 located above the rigid blocking surface 30 and extending horizontally between the plurality of support columns 10.
The rigid blocking surface 30 has higher rigidity than the plastic blocking surface 40 and is less prone to bending deformation.
In this example, a configuration in which the plasticity prevention surface 40 is constructed of a protective net will be described.

<2> Strut The strut 10 includes an intermediate strut and a terminal strut.
The support column 10 has a buried part 11 buried in the installation surface G and an above-ground part 12 that protrudes above the ground surface.
The lengths of the buried portion 11 and the above-ground portion 12 are selected appropriately depending on the installation site, the height dimensions of the blocking surfaces 30 and 40, and the like.

<2.1> Examples of struts As the struts 10, for example, known strut structures such as steel pipes, H steel, columns, and mortar-filled steel pipes can be used.
In this example, a configuration in which the cross-sectional shape of the support column 10 is circular will be described.

<2.2> Embedded portion of support column In this example, the buried portion 11 of the support support 10 is built into a construction hole 14 drilled in the ground, and is filled with a consolidating material 15 such as mortar. The buried portion 11 of the support column 10 may be buried in a concrete foundation and then erected.

<2.3> Above-ground part of the support

In this example, a transparent rigid blocking surface 30 is formed on the lower layer side of the above ground section 12 of the support 10, and a plastic blocking surface 40 is formed on the upper layer side of the above ground section 12 above the transparent rigid blocking surface 30. Form it and explain its form.

In the following description, the range of the above-ground part 12 where the rigid blocking surface 30 is attached is defined as the lower layer section 12a, and the range where the plastic blocking surface 40 is attached is defined as the upper layer section 12b.

<2.3.1> Lower part of the strut The lower part 12a of the ground part 12 is a part where a transparent rigid blocking surface 30 is provided, and its outer peripheral surface is formed as a smooth surface without any protrusions.

<2.3.2> Upper part of the strut The upper part 12b of the ground part 12 is a part where the plastic prevention surface 40 is provided, and a plurality of net attachment elements (for example, brackets, etc.) are provided on the outer peripheral surface thereof.
Net attachment elements corresponding to the constituent members of the protective net are known, and the known net attachment elements are provided on the upper layer 12b.

<3> Transparent-type rigid blocking surface The transparent-type rigid blocking surface 30 is a highly rigid blocking surface with a very small amount of deflection deformation, mainly targeting collapsed earth and sand, and a part of the blocking surface has a plurality of The horizontal slits 32 are formed in multiple stages.
The overall height of the rigid blocking surface 30 is appropriately selected depending on the expected amount of collapsed earth and sand.

An example of the transmission-type rigid blocking surface 30 will be described with reference to FIGS. 2 and 3.
The transmission type rigid blocking surface 30 is constituted by an assembly of highly rigid cross beams 31 arranged in a row at a predetermined interval.
In this example, a configuration will be described in which the end of the cross beam 31 is connected to the above-ground part 11 of the column 10 via the connection device 20 in a manner that is detachable and rotatable in the vertical direction.

In this example, a mode will be described in which the cross beam 31 is installed horizontally at the inner center of the adjacent support columns 10, 10, but the cross beam 31 may be installed horizontally on the slope mountain side or the slope valley side of the adjacent support columns 10, 10.

<3.1> Connecting device The connecting device 20 is a connecting tool for connecting the support column 10 and the cross beam 31.
To explain the connecting device 20 illustrated in FIG. 3, the connecting device 20 includes an annular socket portion 21 that can be connected to the lower layer portion 12a of the support column 10, and a receiving tube 23 that projects laterally from the outer peripheral surface of the socket portion 21. Equipped with.

<3.1.1> Socket Portion The socket portion 21 has a connection hole 22 that passes through the top and bottom. The connecting hole 22 has a diameter that allows it to be externally moored to the lower layer part 12a that constitutes the above-ground part 12 of the support column 10.
The reason why the connection hole 22 of the socket part 21 is dimensioned to be able to be attached to the lower part 12a of the support column 10 is to connect the cross beam 31 so as to be rotatable laterally around the support support 10.

The socket portion 21 may have an endless structure, but the socket portion 21 may be composed of a plurality of divided bodies, and both ends of each divided body having a circular arc shape may be connected with bolts or the like and assembled into an annular shape.
When the socket part 21 is constructed from a plurality of divided bodies, the connecting device 20 can be attached later to the circumferential surface of the support column 10 that has been previously erected.

<3.1.2> Receiving tube A horizontal receiving tube 23 is provided protruding from the outer peripheral surface of the socket portion 21 by welding or the like.
The receiving tube 23 is a receiving member for rotatably pin-coupling the end of the cross beam 31, and a horizontally elongated hole 24 for inserting the support shaft 25 is provided in the vertical plate surface.

In this example, a configuration will be described in which a height difference is provided between the receiving tube 23 and the socket part 21, and the side surface shape of the coupling device 20 is formed into a substantially L-shape. They may have the same height.

As in this example, by setting the height of the socket part 21 to approximately 1/2 of the height of the receiving tube 23, when stacking a plurality of coupling devices 20 in multiple stages, the vertical direction of the coupling devices 20 can be changed alternately. In addition, the horizontal beams 31 in adjacent spans can be placed on the same level.

The connecting device 30 is not limited to the above-mentioned example form, but in short, it can be attached to the above-ground part 12 of the support column 10 in multiple stages, and a plurality of connection devices 20 can be connected between adjacent support columns 10 via the connection device 30. Any structure may be used as long as the cross beam 31 can be attached and detached and horizontally mounted so as to be swingable vertically.

<3.2> Cross beam The cross beam 31 is a highly rigid member with a large bending strength and has a full length that can be horizontally installed between adjacent columns 10 (one span).
A continuous band surface 31a is formed on the side surface of the cross beam 31. The belt surface 31a functions as a catching surface (receiving surface) for various types of fallen objects.
The longitudinal width (height) of the band surface 31a is appropriately selected depending on the type of fallen object, the amount of fallen object, and the like.
Specifically, the strength of the cross beam 31 and the vertical width (height) dimension of the band surface 31a are determined in order to withstand the impact force caused by the collapsed object, which is calculated based on the height of the slope, slope slope, distance between supports, etc. design.
A horizontal hole 33 passing through the cross beam 31 is formed near the end of the cross beam 31.

As the cross beam 31, for example, H steel, a steel pipe, a column, a mortar-filled steel pipe, etc. can be used.
Practically, it is desirable to use a mortar-filled steel pipe in which the H steel is inserted into the column and then filled with a filler such as mortar.

<3.3> Pin connection between the connecting device and the cross beam The support shaft 25 is inserted between the end of the cross beam 31 and the connecting device 20 by inserting it into the elongated hole 24 of the receiver 23 and the horizontal hole 33 of the cross beam 31. Support.
The reason why the end of the cross beam 31 and the connecting device 20 are supported by the support shaft 35 is to enable the horizontal beam 31 to tilt (rotate) in the vertical direction with respect to the connecting device 20.

<3.4> Horizontal slit A horizontal slit 32 is formed between vertically adjacent horizontal beams 31.
The horizontal slit 32 has not only a drainage function but also a function of cushioning fallen debris.
The width dimension (interval) of the horizontal slits 32 is appropriately selected in consideration of the site environment, such as the slope angle and the type of fallen objects.

Practically speaking, the width of the horizontal slit 32 is preferably about 0.5 to 2 times the width of the horizontal beam 31 (the vertical width of the band surface 31a).
If the width of the cross beam 31 is narrower than 0.5 of the width of the cross beam 31, the permeability of fallen objects will be extremely poor, and the buffering effect will deteriorate. If it exceeds twice that, it becomes easier for debris to pass through, and the buffering effect is significantly reduced.

<4> Plastic blocking surface The plastic blocking surface 40 is a flexible blocking surface mainly intended for falling rocks, and is constituted by a protective net made of rope.
The height of the plastic prevention surface 40 is appropriately selected depending on the situation at the site.

The protective net constituting the plasticity prevention surface 40 includes a configuration in which it is horizontally suspended between a pair of adjacent pillars 10 in units of spans, or a configuration in which it is horizontally suspended continuously over a plurality of spans.

<4.1> Illustration of a plastic prevention surface The protective net constituting the plastic prevention surface 40 illustrated in FIG. A covering net material 45 made of wire mesh is provided.
As shown in an enlarged view in FIG. 4, both ends of the horizontal rope 41 are connected to a mounting bracket 13 protruding from the circumferential surface of the support column 10 via, for example, a bolt-type connecting element 42 and a U-bolt set 43.

The protective net is not limited to this example, and may be any one of net materials such as wire rope or wire mesh, or a combination of wire rope and net material.
Further, the protective net may be provided with a shock absorber or may be provided with no shock absorber.

[How to build a protective fence]
Next, we will explain how to construct a protective fence.

<1> Erecting the pillars To explain with reference to FIG. 5, after drilling the erection hole 14 on the installation surface G, the buried part 11 of the pillar 10 to be erected is inserted into the erection hole 14, and then the erection hole 14 is drilled in the installation surface G. Set up
The consolidating material 15 such as mortar may be filled in the erection hole 14 before the pillar 10 is erected, or may be filled after the pillar 10 is erected.

When the coupling device 20 has an endless structure, the column 10 is erected with a plurality of coupling devices 20 attached to the buried portion 11 of the column 10 in advance.
If necessary, an upper chord member 13 is horizontally suspended between the heads of adjacent struts 10.

<2> Formation of Transmissive Type Rigid Blocking Surface Explaining with reference to FIGS. 1 to 3, the cross beam 31 is arranged between the adjacent coupling devices 20, 20 provided on the lower part 12a of the column 10, and the cross beam 31 is Both ends are inserted into the receiving cylinder 21 of the coupling device 20, and are rotatably supported via the support shaft 25.
When a plurality of cross beams 31 are stacked and horizontally mounted between adjacent columns 10, a transmissive rigid blocking surface 30 is constructed while forming a horizontal slit 32 between the upper and lower cross beams 31.

In the present invention, the transparent rigid blocking surface 30 can be formed by horizontally extending a plurality of cross beams 31 between the ground parts 12 of adjacent columns 10 at intervals in the height direction.

Furthermore, since the ends of the cross beams 31 and the support columns 10 are connected via the connecting device 20 so as to be rotatable around the support columns 10, the plurality of cross beams 31 constituting the protective fence can be curved to an arbitrary curvature. It can be installed by
Furthermore, since the connecting portion between the end of the cross beam 31 and the support column 10 is rotatably supported in the vertical direction, even if the installation surface G has an uneven slope or inclination, the installation surface The cross beam 31 can be installed to follow the gradient or inclination.
Therefore, there is no need to level the installation surface G in advance.
Further, since the cross beams 31 can be transported by a worker, the transparent rigid blocking surface 30 can be easily constructed by installing the cross beams 31 only by hand without using heavy machinery.

<3> Formation of plastic prevention surface Referring to FIGS. 1 and 4, a plurality of horizontal ropes 41 are horizontally strung in multiple stages between the upper part 12b of the support column 10, and the entire surface of the prevention surface is covered with a net material 45. A plastic blocking surface 40 is formed thereon.
If necessary, a known spacing member 44 is installed between adjacent horizontal ropes 41.

<4> Other methods of constructing a protective fence As described above, in this example, a configuration will be described in which a plurality of cross beams 31 are installed after the pillars 10 are erected in advance to construct a transparent rigid blocking surface 30. However, the method of constructing the transmission-type rigid blocking surface 30 is not limited to this form, and the work of erecting the pillars 10 and the work of horizontally mounting the cross beams 31 may be reversed.

That is, while stacking a plurality of connecting devices 20, the cross beams 31 are horizontally placed between adjacent connecting devices 20, and the transparent rigid blocking surface 30 is constructed in advance.
The buried portion 11 of the support column 10 is later inserted into the plurality of connecting devices 20 stacked in advance and erected, thereby integrating the support column 10 and the cross beam 31.

[Security fence capture function]
Next, the capture function of the protective fence will be explained.

1. Features a transparent rigid blocking surface

<1> Capturing action of fallen objects by transparent type rigid blocking surface Referring to FIG. 6, the capturing effect of fallen objects _W1 such as collapsed earth and sand by the transparent type rigid blocking surface 30 will be described.
When the fallen object _W1 such as fallen earth and sand slides down toward the protection fence, it collides with a transparent rigid blocking surface 30 near the ground surface of the protection fence.
The impact force of the fallen object _W1 acting on the rigid prevention surface 30 is supported by the strength of the plurality of cross beams 31, and the fallen object _W1 is captured on the band surface 31a on the upstream side of the rigid prevention surface 30.

<2> Deformability of transparent type rigid blocking surface The transparent type rigid blocking surface 30 is composed of a highly rigid cross beam 31 with a large bending strength.
Therefore, even if a large impact force acts on the band surface 31a of each cross beam 31, large bending deformation toward the downstream side does not occur in the cross beam 31.
In this way, in the present invention, the amount of deformation of the rigid blocking surface 30 can be suppressed to a small value, so even if there is an object to be protected such as a road, railway, or house nearby, it is possible to prevent the rigid blocking surface 30 from being too far away from the object to be protected. There is no need to install a protective fence.

<3> Buffering effect by the transparent type rigid blocking surface Since the transparent type rigid blocking surface 30 is provided with a plurality of horizontal slits 32 having a buffering function, the collapsed object _W1 such as collapsed earth and sand can be absorbed through the horizontal slits. The kinetic energy is attenuated as it passes through 32.
Therefore, not only the load burden on the cross beam 31 that constitutes the transparent rigid blocking surface 30 is reduced, but also the load burden on the pillar 10 that supports the cross beam 31 is reduced.

<4> Drainage action by the transparent rigid blocking surface Since the rigid blocking surface 30 has a transparent structure with a plurality of horizontal slits 32, rainwater does not flow down through the horizontal slits 32 before the collapsed object _W1 collapses. Water does not accumulate on the upstream side of the protective fence.
Furthermore, even if the fallen debris _W1 is captured on the upstream side of the transparent rigid blocking surface 30, it can be naturally drained downstream through the horizontal slits 32, so special drainage treatment can be applied to the protective fence. There's no need.

<5> Removal of fallen objects Since each cross beam 31 that constitutes the transparent rigid blocking surface 30 has a removable structure, the cross beams 31 can be easily removed span by span by removing the support shaft 25. be able to.
Therefore, the fallen material _W1 such as fallen earth and sand accumulated on the upstream side of the transparent rigid blocking surface 30 can be easily removed.

<6> Regarding the repairability of the transparent type rigid blocking surface The transparent type rigid blocking surface 30 is composed of a plurality of cross beams 31 that can be attached and detached in units of spans.
Therefore, if some of the cross beams 31 are deformed or damaged due to the impact, the rigid blocking surface 30 can be repaired by replacing the minimum necessary cross beams 31 with new ones.

The above description has been made regarding the case in which a fallen object W ₁ such as fallen earth and sand collides with the rigid blocking surface 30 of a transparent type, but the case where a fallen object W ₂ such as a falling rock collides with the rigid blocking surface 30 of a transparent type has also been described. Demonstrates capture function.

2. Function by plastic prevention surface As shown in FIG. 6, if a fallen object _W2 such as a falling rock falls beyond the installation height of the transparent rigid prevention surface 30, the plastic prevention surface 40 of the protective fence has a catching function. demonstrate.
The trapping effect of the plastic blocking surface 40 on debris W ₂ such as falling rocks is well known, so a detailed explanation will be omitted.

[Example 2]
<1> Other protective fences In the first embodiment described above, a configuration in which the blocking surface of the protective fence is configured by a combination of the transparent rigid blocking surface 30 and the plastic blocking surface 40 was explained. It may also be configured with only the transmission type rigid blocking surface 30.
As shown in FIG. 7, in this example, a transparent rigid blocking surface 30 is formed over the entire length of the above-ground part 12 of the support column 10.

<2> Effects of this example In this example, by configuring the entire above-ground part of the protective fence with the transparent rigid blocking surface 30, the same protective fence can prevent debris such as collapsed earth and sand from being removed. It is possible to efficiently capture not only fallen objects W ₁ but also fallen objects W ₂ such as falling rocks.

G...Supporting surface 10...Strut 11...Buried part 12 of the support...Above-ground part 12a of the support...Upper part 12b of the support...Lower part 13 of the support ... Upper chord member 14 ... Construction hole 20 ... Connection device 21 ... Socket part 22 ... Connection hole 23 ... Receiver tube 24 ... Long hole 25 ... ... Support shaft 30 ... Transparent rigid blocking surface 31 ... Transverse beam 31a ... Band surface 32 ... Lateral slit 33 ... Horizontal hole 40 ... Plastic blocking surface (protective net)
41...Horizontal rope 44...Space maintaining material 45...Net material

Claims (6)

A plurality of pillars that are erected with the buried parts of the pillars buried in the installation surface at intervals, a rigid blocking surface with a very small amount of deflection deformation provided between the above-ground parts of adjacent pillars, and the rigid blocking surface. A protective fence comprising a flexible plastic blocking surface provided above the rigid blocking surface and the plastic blocking surface to trap fallen objects such as fallen earth and sand, an avalanche, and falling rocks,
The rigid blocking surface is formed as a transparent rigid blocking surface by providing a plurality of horizontal slits that allow some of the fallen objects to pass through.
Protective fence. 2. The protective fence according to claim 1, wherein the transparent rigid blocking surface is composed of a plurality of cross beams, and a continuous band surface is formed on the side surface of the cross beam. Claim characterized in that a connecting device is rotatably externally mounted on the above-ground part of the support, and the connecting device and the end of the cross beam are pivotally supported by a horizontal support shaft to form a pin connection. The protective fence described in 2. 3. The protective fence according to claim 2, wherein the plurality of cross beams are removably installed horizontally between the above-ground parts of adjacent pillars. The protective fence according to claim 2, characterized in that the cross beam is made of concrete-filled steel pipes. The protective fence according to claim 1, characterized in that the plastic prevention surface is a protective net made of rope, net, or a combination of rope and net.

Images