JP5818213B2 - Guard fence and its construction method - Google Patents

Description

The present invention relates to a protective fence that is constructed on a mountainside slope such as a road in a mountainous area and receives a landslide, falling rocks, snowfall, etc., and prevents falling and inflowing onto a road and the like, and a construction method therefor .

  2. Description of the Related Art Conventionally, various protective fences are known that are constructed on slopes of mountainsides, etc., and receive earth and sand, falling rocks and the like to prevent falling and inflowing onto roads and the like. This type of guard fence post is required to have a higher bending stress in order to receive debris flow. For example, as disclosed in Patent Document 1, a reinforcing rib having a triangular cross section is inserted into a steel pipe to increase the strength. An enhanced version has been proposed.

  However, in the case of the support structure disclosed in Patent Document 1, there is a problem that it takes time to fix the triangular reinforcing rib in the steel pipe. Furthermore, if the welding between the apex of the triangular reinforcing rib and the inner surface of the steel pipe is separated, the reinforcing effect is reduced.

  Therefore, as a support having a higher degree of bending strength, a support made by stacking a plurality of short pipes on the inside and outside has been proposed as disclosed in Patent Document 2. This strut is arranged across the top and bottom of the upper end of the lower pipe inserted inside the base pipe, the lower pipe inserted into the lower pipe inside the lower pipe, and the lower pipe inserted into the lower pipe as a whole. The inside of the three tubes is filled with a filler and integrated. And the net | network which receives earth and sand is attached and stretched by the part which an edge part protrudes in the ground surface of a foundation pipe.

JP 2002-266321 A JP 2010-37765 A

  The triple-structured column disclosed in Patent Document 2 can be set to a higher bending stress than the column disclosed in Patent Document 1, and can be a column having a high resistance to debris flow. In construction sites where large ground or large rocks may fall, struts with a higher bending stress were desired.

The present invention has been made in view of the above-mentioned background art, and can increase the section modulus in the direction of debris flow, increase the allowable bending stress with respect to bending load, and effectively resist debris flow and impact resistance. The purpose is to provide a high protection fence and its construction method .

The present invention relates to a foundation pipe buried in the ground on a slope on the mountain side of an inclined ground, a cylindrically formed base end portion inserted into the foundation pipe and fixed, and a portion extending from the foundation pipe is attached to the slope. An outer tube that is erected, an inner tube that is inserted into the outer tube, and an inner surface of the inner tube that is disposed in contact with the inner surfaces of the slope and the valley side of the inner tube. A reinforcing member, a positioning member fixed to the reinforcing member, and positioning the reinforcing member so as to contact the crest and trough sides of the inner surface of the inner tube, the inner tube, the outer tube, and the base tube The inner tube and the outer tube, and a filler that connects the base tube to each other, and a protective net that is erected on the slope and fixed to the mountain side surface of the outer tube ,
The reinforcing member has a reinforcing material and a positioning member,
The positioning member has a pair of positioning portions that are concentrically curved with the inner wall surface of the inner tube and are positioned 180 ° opposite to each other, and a connecting portion that connects the pair of positioning portions,
The reinforcing material is integrally fixed to the outside of each of the pair of positioning portions of the positioning member,
In a state where the reinforcing member and the inner tube are integrally fixed, the reinforcing member and the inner tube are inserted into the outer tube,
In construction state, a safety barrier which is a surface along the opposing direction of the pair of positioning portions located in the 180 ° opposite to each other, Ru is arranged so as to include an inclination direction of the slope.

  The reinforcing member and the inner tube are set to have substantially the same length, and the reinforcing member is fixed to the inner tube.

  A spacer projection is fixed to the outer peripheral surface of the inner tube, and the outer tube and the inner tube facing each other are concentrically positioned by the spacer projection in a state where the inner tube is inserted into the outer tube. is there.

  The outer tube and the inner tube are set to have substantially the same length.

The present invention also relates to a method for constructing a protective fence in which a pillar is inserted and fixed in a foundation pipe buried in the ground on a mountain side slope of an inclined land.
A positioning member having a pair of positioning portions that are concentrically curved and positioned 180 ° opposite to each other and a connecting portion that connects the pair of positioning portions;
A reinforcing member is formed by integrally fixing a reinforcing material to the outside of each of the pair of positioning portions of the positioning member,
The reinforcing member is inserted into the inner tube and fixed together, the inner tube is inserted into the outer tube,
In the construction state, the outer pipe into which the inner pipe is inserted is used as the base pipe so that the surfaces along the opposing direction of the pair of positioning portions positioned 180 ° opposite to each other include the inclined direction of the slope. It is a construction method of a protection fence in which a protection net is stretched on the mountain side surface of the outer pipe that is inserted and extended from the foundation pipe.

In the protective fence and its construction method of the present invention, the column part that is most susceptible to impact when receiving debris flow or the like and that generates a large bending stress is reinforced with a reinforcing member, so that the section modulus of the column with respect to the load in the debris flow direction increases. However, the allowable bending stress is increased and high proof stress is provided against debris flow. Moreover, assembly and construction are easy and the cost can be reduced.

It is a partial front view which shows one Embodiment of the protection fence of this invention. It is a partial front view which shows the center part of the protection fence of this embodiment. It is a left view of the protection fence of this embodiment. It is a partial enlarged front view which shows the upper end part of the support | pillar of the protection fence of this embodiment. It is a partial enlarged front view which shows the lower end part of the support | pillar of the protection fence of this embodiment. It is a disassembled front view of one Embodiment of the support | pillar of the protection fence of this embodiment. They are the partial expanded front view (a) of the outer pipe | tube center part of the protection fence of this embodiment, and AA sectional drawing (b). They are the partial expanded front view (a) of the outer side pipe upper end part of the protection fence of this embodiment, and BB sectional drawing (b). They are the partial enlarged front view (a) of the inner pipe upper end part of the protection fence of this embodiment, and CC sectional drawing (b). They are the partial enlarged front view (a) of the inner pipe upper end part of the protection fence of this embodiment, DD sectional drawing (b), and the partial enlarged front view (c) of a lower end part. The front view (a) which shows the state which inserted the inner pipe | tube in the outer pipe | tube of the protection fence of this embodiment, the partial enlarged front view (b) of an outer pipe upper end part, the partial enlarged front view (c) of an outer pipe | tube intermediate part FIG. 10 is a partially enlarged front view (d) of the lower end portion of the outer pipe. It is EE sectional drawing of FIG.

Hereinafter, an embodiment of a protection fence and its construction method according to the present invention will be described with reference to the drawings. The protective fence 10 according to this embodiment is provided on a slope on a mountain side such as a road or a railroad in a mountainous area, which is an inclined land, and is installed along a dangerous place in order to prevent landslide and the like. As shown in FIGS. 1 to 3, the protective fence 10 is erected on a slope 12 on the mountain side, and includes, for example, four support columns 14 and a protection net 16 stretched between the support columns 14. . The four struts 16 are erected at substantially equal intervals, about 1/3 of the total length of the struts 14 is located in the ground, and about 2/3 is erected vertically from the ground surface. A protective net 16 is attached to a portion of the column 16 protruding from the inclined surface 12 by a fixing member (not shown).

  As shown in FIGS. 3 to 11, the support column 14 includes a steel pipe outer pipe 20 and an inner pipe 22, and is inserted into a steel pipe base pipe 18 embedded in the ground of the slope 12 and is erected. The The basic tube 18, the outer tube 20, and the inner tube 22 are formed in a thin tube diameter in this order, and are all cylindrical tubes that are open at both ends. Is formed.

  When the foundation pipe 18 is constructed on the slope 12, the entire length of the foundation pipe 18 is buried in the ground of the slope 12. As shown in FIGS. 3 and 6, the foundation pipe 18 is buried in an excavation hole 24 formed in the slope 12. 18a is positioned at the bottom of the excavation hole 24, and the upper end 18b is positioned on the ground surface. The outer diameter of the basic pipe 18 is appropriately set according to the situation of the installation place. For example, the length is about 3.5 m, the outer diameter is about 220 mm, the pipe thickness is about 8 mm, and the like.

  As shown in FIGS. 6 to 9, the outer tube 20 is thick enough to be inserted into the basic tube 18 with a predetermined gap, and in a state where the outer tube 20 is constructed on the slope 12, the lower end 20 a of the outer tube 20. Reaches about 2/3 from the upper end portion 18a of the basic pipe 18 and is positioned by the stopper projection 26, and about 1/3 of the total length is accommodated in the basic pipe 18. The remaining 2/3 of the outer tube 20 stands out from the ground surface of the slope 12. As shown in FIG. 7, the stopper protrusions 26 protrude outward from the outer peripheral wall surface of the outer tube 20 and are arranged at four locations at substantially equal intervals in the circumferential direction. The diameter of the circumference connecting the tips of the stopper protrusions 26 is larger than the inner diameter of the basic tube 18.

  As shown in FIG. 8, a guide protrusion 28 is provided on the inner peripheral wall surface of the upper end portion 20 b of the outer tube 20. The guide protrusions 28 project inwardly on the inner peripheral wall surface of the outer tube 20 and are arranged at four locations at equal intervals in the circumferential direction. The diameter of the circumference connecting the tips of the four guide protrusions 28 is slightly larger than the outer diameter of the inner tube 22.

  On the inner peripheral wall surface of the lower end portion 20a of the outer tube 20, as shown in FIG. 9, a tapered stopper projection 30 is provided with a tip projecting downward. The stopper protrusions 30 project inward from the inner peripheral wall surface, and are provided at four positions at equal intervals in the circumferential direction, and are provided at the same position in the circumferential direction as shown in FIG. 9B. . The diameter of the circumference connecting the tips of the four stopper protrusions 30 is slightly smaller than the outer diameter of the inner tube 22.

  As shown in FIG. 6C, a through hole 32 through which a filler 50 described later can pass is formed in the peripheral wall from the stopper projection 26 of the outer tube 20 to the lower end portion 20a. The through holes 32 are arranged at regular intervals in the length direction of the outer tube 20 and at regular intervals in the circumferential direction. For example, the outer tube 20 has a length of about 5 m, an outer diameter of about 165 mm, and a tube thickness of about 7 mm.

  The inner tube 22 is narrower than the outer tube 20, the lower end portion 22 a is positioned at the lower end portion 20 a of the outer tube 20, and the upper end portion 22 b is also positioned at the upper end portion 20 b of the outer tube 20. Spacer protrusions 34 and 36 are provided on the outer peripheral wall surfaces of the lower end 22a and the upper end 22b of the inner tube 22, as shown in FIGS. The spacer protrusions 34 and 36 protrude outward from the outer peripheral wall surface, and are arranged at four locations at equal intervals in the circumferential direction. The diameter of the circumference connecting the tips of the spacer protrusions 34 and 36 is slightly smaller than the inner diameter of the outer tube 20. The spacer protrusions 34 and 36 are provided at the same position in the circumferential direction.

  On the peripheral wall from the lower end 22a to the upper end 22b of the inner tube 22, as shown in FIG. 6D, a through hole 38 through which a filler 50 described later can pass is formed. The through-holes 38 are arranged at regular intervals in the length direction of the inner tube 22 and at regular intervals in the circumferential direction. For example, the inner tube 22 has a length of about 5 m, an outer diameter of about 140 mm, and a tube thickness of about 10 mm.

As shown in FIG. 10B, a reinforcing member 40 for reinforcement is inserted in the inner tube 22 in the length direction of the inner tube 22. The reinforcing member 40 includes a reinforcing member 44 such as a reinforcing bar and a positioning member 42 , and is substantially equal to the length of the inner tube 22 and is located in the inner tube 22 over the entire length. The reinforcing member 44 is fixed to the positioning member 42 and is provided so as to be positioned along the inner wall in the inner tube 22. As shown in FIG. 10B, the positioning portions 42a on both sides of the positioning member 42 are formed in an outer surface shape concentric with the inner wall of the inner tube 22, and four reinforcing members 44 are welded to each positioning portion 42a. Has been fixed. The positioning member 42 only needs to hold the reinforcing member 44 in a shape that can be accommodated in the inner tube 22, and may be fixed to an appropriate location along the reinforcing member 44. Four reinforcing members 44 are fixed at symmetrical positions 180 ° opposite to each other in the inner tube 22 in a state where the reinforcing members 44 are fixed by the positioning member 42, and the outer surfaces of the four reinforcing members 44 are the inner tube 22. The connecting portion 42b of the positioning member 42 is set so as to be in contact with the inner peripheral surface. The reinforcing member 44 is made of, for example, a reinforcing bar having a length of about 5 m and a diameter of about 20 mm.

  The support column 14 is configured by inserting the inner tube 22 into which the reinforcing member 40 is inserted into the outer tube 20. The support column 14 is configured as a combination as shown in FIGS. 11 and 12, and is inserted into the foundation tube 18 for construction. Furthermore, a filler 50 such as a non-shrink mortar (not shown) is filled inside the outer tube 20 and the inner tube 22 and integrated. The upper end of the outer tube 20 that is the upper end of the support column 14 is closed with a cap 46 for waterproofing or the like.

  The protective net 16 stretched on the mountain side of each column 14 is formed, for example, by knitting a mesh rope made of flexible chemical fiber such as polyethylene having weather resistance against ultraviolet rays or the like into a substantially rectangular mesh. A steel wire formed in a mesh shape is preferably used. In addition, a double net is used, which is a net with a coarse mesh that emphasizes the improvement of shock absorption when falling rocks, etc., and a net with a fine mesh that emphasizes preventing pebbles from passing. May be.

  An upper chord member 48, which is a long metal member that connects the upper end portions and maintains a constant interval between the support posts 14, is attached to the upper end portion of the support posts 14. Further, a steel wire rope 52 connecting the tops of the columns 14 is installed on the mountain side of the upper end of the column 14 and on the valley side of the protective net 16. Similarly, a wire rope 54 that connects the columns 14 is also installed on the mountain side surface of the lower end of the column 14.

As shown in FIGS. 1 to 5, the wire ropes 52, 54 are shock absorbers 56, 58 connected to connection convex portions 60 protruding from the mountain side surfaces of the upper and lower ends of the columns 14 at both ends of the guard fence 10. Both ends 52a and 54a are connected to each other. The shock absorbers 56 and 58 extend both end portions 52a and 54a of the wire ropes 52 and 54 to the side, and sandwich the wire ropes 52 and 54 by the sandwiching members 56a and 58a. The wire ropes 52 and 54 are clamped by holding both ends 52a and 54a of the wire ropes 52 and 54 so that a predetermined frictional force is applied, and the wire ropes 52a and 54a with respect to the clamping members 56a and 58a with a predetermined tension or more. 52 and 54 are slidably provided.

The shock absorbers 56 and 58 have U-shaped connectors 56 b and 58 b, and the connectors 56 b and 58 b are engaged with the connection convex portion 60 of the support column 14. And clamping member 56a, 58a is being fixed to the both ends of connector 56b, 58b. At both ends of the wire ropes 52 and 54, stoppers 62 that engage with the holding members 56a and 58a and stop the sliding are integrally fixed. Further, a wire insertion ring 64 through which an intermediate portion of the wire ropes 52 and 54 is inserted projects from the column 14 positioned between the columns 14 at both ends of the protective fence 10.

Between the support columns 14, a pair of steel wire cross wires 66 and 68 are installed between the support columns 14 and the protective net 16. The cross wires 66 and 68 are made of a steel wire thinner than the wire ropes 52 and 54, and the wire insertion ring 64 of the adjacent strut 14 from the connecting convex portion 60 protruding on the side surface on the mountain side of the upper and lower ends of the strut 14 is used. It is constructed to cross each other. As shown in FIGS. 4 and 5, both ends of the cross wires 66 and 68 are connected to the connecting convex portion 60 by a turnbuckle 70, and intermediate portions of the cross wires 66 and 68 are connected to each other as shown in FIG. The wire 14 is inserted into a wire insertion ring 64 projecting from the mountain side surface of the intermediate column 14 so as to cross each other and draw a mountain shape. Thereby, as shown in FIGS. 1 and 2, the cross wires 66 and 68 are constructed so as to draw an equilateral mountain shape symmetrically to each other.

Next, an embodiment of a construction method of the protective fence 10 will be described. When constructing the protective fence 10 of this embodiment, first, the reinforcing member 40 is formed. The reinforcing member 40 welds and fixes a plurality of positioning members 42 to predetermined positions of the reinforcing member 44 at predetermined intervals, thereby integrating the reinforcing members 40. The number of reinforcing members 44 is appropriately set depending on the required strength and the inner diameter of the inner ring 22. Further, the inner tube 20 is formed with a through hole 38 at a predetermined position, and spacer protrusions 34 and 36 are also formed. Thereafter, the reinforcing member 40 is inserted along the inner wall in the inner tube 22. Both end portions of the reinforcing member 40 and both end portions of the inner tube 22 are integrally formed by being appropriately fixed by welding or the like.

  Thereafter, the inner tube 22 is inserted into the outer tube 20. A through hole 32 is formed in the outer tube 20 in advance, and the stopper protrusions 26 and 30 and the guide protrusion 28 are welded. Then, the inner tube 22 inserted into the outer tube 20 is positioned in contact with the stopper protrusion 30 as shown in FIG. The inner tube 22 is guided by a guide projection 28 provided on the inner wall of the outer tube 22 and is inserted concentrically. The spacer projections 34 and 36 provided on the outer wall of the inner tube 22 allow the inner tube 22 to be substantially Located concentrically. As a result, a double tubular column 14 is completed.

  Next, in a construction site such as a mountainous area, an excavation hole 24 having a predetermined length of the foundation pipe 18 is formed, and the upper end portion 18b of the foundation pipe 18 is buried in a state of opening to the ground surface. Then, after adjusting the verticality or the like of the basic tube 18 and solidifying the periphery, the double tubular column 14 is inserted into the basic tube 18. When the support column 14 is inserted inside the foundation tube 18, the lower end portion of the support column 14 is coaxially inserted from the upper end opening of the foundation tube 18. When the stopper projection 26 of the outer tube 20 of the support column 14 reaches the upper end of the foundation tube 18, the lower surface of the stopper projection 26 is locked to the upper end surface of the foundation tube 18, and the position of the support column 14 in the height direction is determined. The

  Further, the direction of the reinforcing member 40 is adjusted before the support 14 is fixed. The direction of the column 14 must be set so that the reinforcing member 44 of the reinforcing member 40 provided on the inner tube 22 is accurately positioned on the mountain side and the valley side. Therefore, when the support column 14 is inserted into the basic tube 18 and thereafter, the position of the reinforcing member 44 is confirmed, and the connecting portion 42 b is aligned along the inclination direction of the inclined surface 12. Thereby, the reinforcement | strengthening of the site | part to which the maximum tensile stress when the force by a debris flow is applied to the support | pillar 14 and the maximum compressive stress is made.

  Next, a filler 50 such as mortar is injected into the base tube 18, the outer tube 20 of the support column 14, and the inner tube 22 and cured. As a result, the base tube 18, the outer tube 20 of the support column 14, the inner tube 22, and the reinforcing member 40 are integrated. The filler 50 is injected into the inner tube 22 from the upper end opening of the support column 14 and spreads in and out of each tube through the through hole 38 of the inner tube 22 and the through hole 32 of the outer tube 20. Furthermore, if the filler 50 is also injected from the gap at the upper end of the basic pipe 18, it can be filled more efficiently. The filler 50 is cured in a state where the filler 50 is distributed in the basic tube 18, the outer tube 20 and the inner tube 22, and the respective tubes are integrated. Thereafter, a cap 46 for waterproofing is put on the upper end of the support column 14.

  Next, the wire ropes 52 and 54 and the cross ropes 66 and 68 are installed on the mountain side of the column 14 so as to connect the columns 14 to each other. Then, the protective net 16 is stretched across the plurality of columns 14 on the mountain side of the column 14. The peripheral edge of the protective net 16 is connected to the wire ropes 52 and 54 and the column 14 using a connecting tool (not shown).

  Next, the buffer function of the protective fence 10 of this embodiment will be described. When the earth and stone collide with the protective fence 10, the protective net 16, the wire ropes 52 and 54, and the cross ropes 66 and 68 are deformed to the valley side and extended by the kinetic energy at the time of the collision. Since the wire ropes 52 and 54 and the cross ropes 66 and 68 are installed on the valley side of the protective net 16, even if the debris does not directly hit the wire ropes 52 and 54 or the cross ropes 66 and 68, Due to the displacement, tension is applied to the wire ropes 52 and 54 and the cross ropes 66 and 68.

  The absorption of the collision energy of the debris is first absorbed by the resistance against deformation of the protective net 16 when the protective net 16 is extended while being deformed. Further, due to the deformation of the protective net 16, tension is applied to the wire ropes 52 and 54, and a force acts so as to pull out the wire ropes 52 and 54 against the clamping members 56a and 58a at both ends of the couplers 56b and 58b. The energy is absorbed by the sliding resistance at that time. Further, the wire ropes 52 and 54 and the cross ropes 66 and 68 are elastically deformed and extended by impact energy due to earth and stone, and in some cases are extended to a plastic deformation region, thereby absorbing the impact energy. .

  At this time, a force acts on the support column 14 from the mountain side to the valley side, and a bending stress with respect to the load from the mountain side to the valley side is generated in the support column 14. The maximum tensile stress and the maximum compressive stress at this time are the crest side and the trough side part of the cross section of the support column 14 and the part where the reinforcing member 44 of the reinforcing member 40 is located. Has high yield strength.

As described above, according to the protective fence 10 and its construction method of this embodiment, the section modulus of the column 14 in the load direction by the debris flow can be greatly increased, and a high proof stress is also obtained against a large amount of debris flow. It is possible to install the struts 14 having the structure and effectively prevent debris flow. Furthermore, since it has a high yield strength against bending, it is possible to reduce the diameter of the support column 14 or to reduce the mass, thereby improving the workability.

  In addition, the protection fence of this invention and its construction method are not limited to the said embodiment. For example, other structures or methods may be used for the positioning structure of the base tube, the outer tube, and the inner tube. Moreover, you may fix to a support | pillar, without providing a buffer device in the both ends of a wire rope. Furthermore, the length and the number of the columns and the reinforcing members can be set as appropriate, and the reinforcing member may be shorter than the inner tube or may be inserted in a portion requiring reinforcement. In addition, there is no particular limitation on the interval between the support columns, the mesh size of the net, the external dimensions, and the number of pieces, and it can be set freely in consideration of the topography of the construction site, the object to be received (stone, earth and sand, snow), etc. Can do. You may abbreviate | omit a side net as needed.

DESCRIPTION OF SYMBOLS 10 Guard fence 12 Slope 14 Support column 16 Protective net 18 Base pipe 20 Outer pipe 22 Inner pipe 24 Excavation hole 26, 30 Stopper protrusion 28 Guide protrusion 34, 36 Spacer protrusion 32, 38 Through hole 40 Reinforcement member 42 Positioning member 42a Positioning part 42b Connecting portion 44 Reinforcing material 50 Filler 52, 54 Wire rope 56, 58 Shock absorber 66, 68 Cross wire

Claims (5)

A foundation pipe buried in the ground on the mountainside slope of the slope,
An outer tube formed in a cylindrical shape, a base end portion inserted into and fixed to the basic tube, and a portion extending from the basic tube standing on the slope;
An inner tube inserted into the outer tube;
A reinforcing member inserted into the inner tube ;
A filler that fills a hollow portion of the inner tube, the outer tube, and the basic tube, and connects the inner tube, the outer tube, and the basic tube to each other;
It is composed of a protection net that is erected on the slope and fixed to the mountain side surface of the outer pipe ,
The reinforcing member has a reinforcing material and a positioning member,
The positioning member has a pair of positioning portions that are concentrically curved with the inner wall surface of the inner tube and are positioned 180 ° opposite to each other, and a connecting portion that connects the pair of positioning portions,
The reinforcing material is integrally fixed to the outside of each of the pair of positioning portions of the positioning member,
In a state where the reinforcing member and the inner tube are integrally fixed, the reinforcing member and the inner tube are inserted into the outer tube,
A protective fence characterized in that, in a construction state, a surface along a facing direction of a pair of positioning portions positioned 180 ° opposite to each other is arranged so as to include an inclination direction of the slope .   The protective fence according to claim 1, wherein the reinforcing member and the inner pipe are set to have substantially the same length, and the reinforcing member is fixed to the inner pipe.   A spacer projection is fixed to the outer peripheral surface of the inner tube, and the outer tube and the inner tube facing each other are concentrically positioned by the spacer projection in a state where the inner tube is inserted into the outer tube. 2. Guard fence according to 2.   The protective fence according to claim 3, wherein the outer pipe and the inner pipe are set to have substantially the same length. In the construction method of the protective fence that inserts and fixes the column to the foundation pipe buried in the underground of the mountain side slope of the slope,
A positioning member having a pair of positioning portions that are concentrically curved and positioned 180 ° opposite to each other and a connecting portion that connects the pair of positioning portions;
A reinforcing member is formed by integrally fixing a reinforcing material to the outside of each of the pair of positioning portions of the positioning member,
The reinforcing member is inserted into the inner tube and fixed together, the inner tube is inserted into the outer tube,
In the construction state, the outer pipe into which the inner pipe is inserted is used as the base pipe so that the surfaces along the opposing direction of the pair of positioning portions positioned 180 ° opposite to each other include the inclined direction of the slope. A method for constructing a protective fence, characterized in that a protective net is stretched on the side surface of the outer pipe that is inserted and extended from the foundation pipe.

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