JP2916633B2 - Rock fall protection net construction method and pillar device for rock fall protection net pocket formation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a rock-fall protection net suitable for construction in a swamp where there is a risk of rock-fall near a road or the like, and a pillar device for forming a pocket for the rock-fall protection net. It is about.

[0002]

2. Description of the Related Art Conventional rock fall protection nets are roughly classified into a cover type and a pocket type. The falling rock fall protection net is composed of a large area wire mesh with a number of vertical ropes and a plurality of horizontal ropes installed at intervals from each other, and the ends of each vertical rope and each horizontal rope are anchored to the slope, and the wire mesh with this rope is attached. Is laid and covered with moderate flexibility on the slopes, and its toughness and elasticity supports floating stones and the like to prevent rock jumps and falling rocks. In addition, the pocket-type rock fall protection net is a suspension rope anchored at the top of the slope by erection of a large number of support posts for forming the pocket at relatively small intervals in the horizontal direction and tilting up and down. Is connected to the upper part of each column and supported, the upper ends of a number of vertical ropes incorporated in the wire mesh are connected to the upper portions of the columns, and the upper end horizontal rope incorporated in the wire mesh is fixed to the upper portion of each pillar with U bolts Then, anchor both ends of the plurality of horizontal ropes incorporated in the wire mesh to the slope, suspend the wire mesh with the rope in a curtain shape by each strut, and from above the pocket portion formed with the full length of the wire mesh with the rope, It has a pocket-type structure that buffers and absorbs falling rock energy and receives and holds it. It has such features that it can be constructed on a small scale by shortening the vertical length compared to the covering type.

[0003]

The conventional pocket-type rock fall protection net has the characteristics of small scale and cost saving as described above. In a wire mesh reinforced only with steel, there is basically a limit to the strength, that is, the proof strength, of buffering and absorbing large rock falling energy falling from above and receiving and holding the rock falling.
In particular, rockfalls that have been received concentrate on the lower part of the wire mesh and gradually bulge, causing the rocks and the like to directly collide with the lower part of the wire mesh. Protective performance with safety, such as being damaged,
There is a fundamental challenge in reliability. In addition, since many pillars are required and are laid and installed at relatively small intervals, it takes a lot of trouble to build and it is a difficult operation. In a swollen portion or the like, an insufficient anchoring force or a variation in built-in strength is likely to occur. Insufficient proof strength of the wire mesh and the performance and reliability of the pillar There are problems such as lack of durability.

The present invention has been developed in order to solve the above-mentioned problems. The object of the present invention is to reinforce a wire mesh with vertical and horizontal ropes and more vertical and horizontal reinforcing ropes. The left and right supports are erected on both sides of the slope, etc. and supported by hanging ropes and side ropes, and the upper horizontal rope incorporated in the wire mesh is slidably supported at the top of each support, and the reinforcement ropes By constructing the upper half part of the wire mesh with the pocket part and the lower half part as the laying part, the rock fall protection net construction method and the rock fall protection net which improved the rock fall protection performance, reliability and durability as well as the cost and reduced the cost It is an object of the present invention to provide a column device for forming a pocket.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a left and right vertical rope, an upper end horizontal rope, and a plurality of lower half horizontal ropes are reinforced by incorporating a number of vertical and horizontal reinforcing ropes into a wire mesh.
The left and right supports are hinged to anchors provided on both slopes of the swamp, etc., so that the swivel can be tilted up and down, and the ends of the hanging ropes and side ropes anchored to the slopes on both sides are supported. Connect the upper end of the left and right vertical ropes to the upper part of the support, and support the upper end horizontal ropes anchoring both ends on both side slopes slidably at the upper part of each support, Anchor both ends of each lower half horizontal rope on both side slopes, configure the upper half of the wire mesh as a pocket that absorbs and absorbs rockfall energy, and place the lower half of the wire mesh on the ground such as a swamp. It is characterized by the construction method of rock fall protection nets constructed and constructed on the laying part that lays and receives rock fall, etc.Strength, that is, strength is remarkably increased as a wire mesh with reinforcing ropes, the number of pillars is reduced, and It can be built on both slopes, The pillar is supported by hanging ropes and side ropes, the upper end horizontal rope is slidably supported on the upper part of the support, and the upper half of the wire mesh with the reinforcing rope is pocketed and the lower half is covered by multiple lower half horizontal ropes. By constructing it on the laying part, the protection performance against rock fall, reliability and durability are improved as well as workability. In addition, the facility is small and costs are reduced.

Further, in the above-mentioned rock fall protection net construction method, the rock fall protection net is characterized in that it is constructed in a plurality of steps at a vertical interval in a swath portion or the like, and each rock fall protection net is further reduced in size. In this way, the rockfall protection performance and reliability have been further improved in general, such as making the construction easier and improving the protection performance and reliability.

[0007] In a pillar for forming a pocket which is applied to the method of netting for rock fall protection described above, the swivel portion is vertically hinged by being hingedly connected to anchors provided on both side slopes of the swirl portion or the like. A support rod to be inserted, a plurality of brackets attached around the upper part of the support column and connecting the suspension rope and the side rope, a suspension rope and side ropes anchored on both side slopes and connected to the bracket to support the support column, and an upper end of the support column A pillar device for forming a pocket for a rock fall protection net, comprising: a convex curved portion slidably supporting an upper end horizontal rope incorporated in a wire mesh provided in a portion, and a guide metal fitting for the upper end horizontal rope attached to the convex curved portion. The lower end of each strut is hingedly connected to an anchor provided on both side slopes of the swirl, etc., so that the swivel can be tilted up and down, and a bra provided around the upper part of the strut The hanging rope and the side rope are connected to and supported by the shoes, and the upper end horizontal rope incorporated in the wire mesh is slidably supported by the convex curved portion provided at the upper end of the column and the guide metal fittings, so that the above-described operation is achieved. It exerts its effects, and enhances the supportability, pocket formation performance, reliability and durability as well as workability.

[0008]

According to the present invention, there is provided a wire mesh having the above-described structure,
In addition to the conventional left and right vertical ropes, upper horizontal ropes, and multiple lower horizontal ropes, a large number of vertical and horizontal reinforcing ropes are incorporated to remarkably reinforce and reduce large rockfall energy that falls from above in swamps etc. The strength and proof stress of absorbing and absorbing and receiving and holding are remarkably enhanced. In addition, with the remarkable increase in strength and proof strength of the wire mesh with the reinforcing ropes, it is possible to greatly increase the interval between the columns and to reduce the number thereof. Therefore, the left and right struts are easily and accurately built by using anchors provided on the solid ground on the slopes on both sides such as swamps, and are erected in such a way that the swivels can be tilted in the vertical direction. In addition to supporting with side ropes to prevent the same inclination in the horizontal direction, the upper end horizontal rope incorporated in the wire mesh is slidably supported, effectively reducing the impact of falling rocks on the columns, The column performance, reliability, and durability are effectively improved, such as by reducing the unbalanced load caused by lateral tilting of the column with torsion.

Further, the length of the upper end horizontal rope between the columns is significantly increased due to a large increase in the distance between the columns, and the long upper end horizontal rope supports the entire width of the wire mesh with reinforcing ropes,
Due to the significantly increased rope extension of the upper side rope,
The elasticity of the wire mesh with the reinforcing rope, that is, the cushioning, the absorption performance and the durability are remarkably improved, and the excellent protection performance of effectively buffering and absorbing the large rock fall energy in the swollen portion or the like is exhibited. The pocket portion can be formed in the upper half portion of the wire mesh with the reinforcing rope, and effectively absorbs and absorbs rockfall energy. The laid part in the lower half is supported by a plurality of lower half horizontal ropes, catches and absorbs low-speed rock fall, etc. absorbed and absorbed by the pocket, and gradually disperses the rock fall and holds it for a long time Such as
Excellent protection performance, reliability, and durability as well as workability have been significantly improved, such as excellent catching and holding performance and reliability for falling rocks. Therefore, the construction can be performed on a small scale, and the construction cost can be reduced.

Further, by constructing the rock fall protection net in a plurality of steps in a swamp portion or the like, the individual rock fall protection nets can be made smaller and easily constructed, so that the protection performance and reliability are further improved. Further, the supporting device for forming a pocket which is applied to the rock fall protection net has the above-mentioned structure, and an anchor is easily and strongly provided on both firm slopes, and the lower end of the supporting member is hinged on the anchor. The column can be connected to be tilted in the inclination direction of the swirl portion or the like, and the column can be easily and accurately built by the strong anchor. In addition, the upper part of the column supports the hanging rope and the side rope to prevent lateral inclination, and the upper end horizontal rope is slidably guided and supported by a convex curved portion and a guide fitting provided at the upper end of the column, In addition, the impact on the wire mesh with reinforcing rope due to falling rocks etc. is significantly reduced at the upper end of the pillar, and the torsional lateral tilt of the pillar is effectively reduced, such as pillar performance,
The reliability and the durability of the wire mesh with reinforcing ropes have been significantly improved as well as the reliability.

[0011]

1 and 2 show a first example of an uninvented rock fall protection net.
Embodiment, FIG. 3 shows a second embodiment, FIG. 4 shows one embodiment of a column for forming a pocket, and FIG. 5 shows one embodiment of an anchor.
In the figure, a is a swamp part which is likely to fall, for example, near a road R, etc., b is a slope on both sides of the swath part a, 1 is a wire mesh, 2 is a vertical / horizontal reinforcing rope incorporated in the wire mesh vertically and horizontally. Reference numeral 4 is a clamp for connecting or crossing each rope, 5 is a left and right vertical rope incorporated on both sides of the wire mesh, 6a is an upper end horizontal rope incorporated at the upper end of the wire mesh, and 6b is a lower half of the wire mesh. A plurality of lower half horizontal ropes, which are installed at upper and lower intervals in the portion, 7 is a column supporting the upper part of the wire mesh to form a pocket portion, 7d is a hinge connection, and 7h is a convex curved portion provided at the upper end of the column. , 7f are guide fittings attached to the convexly curved portion, 8a is a suspension rope for supporting the column 7, 8b is a side rope, 9a and 9b are anchors, 10 is a rock fall protection net constructed on a swath-shaped portion a or the like, 1
Reference numeral 0a denotes a pocket portion formed in the upper half of the wire mesh with the reinforcing rope, and 10b denotes a laying portion formed in the lower half thereof.

In the embodiment shown, a left and right vertical rope 5, an upper end horizontal rope 6a and a plurality of lower half horizontal ropes 6b as well as a number of vertical / horizontal reinforcing ropes 2 are incorporated into a wire mesh 1 to reinforce the wire mesh. The left and right pillars 7 are hinged 7d to the anchors 7a provided on both side slopes b of the portion a and the like, and the swivel portions and the like can be tilted up and down, and the anchors 9a and 9b are mounted on both side slopes b.
The ends of the suspended ropes 8a and the side ropes 8b are connected to and supported by the upper portions of the columns, the upper ends of the left and right vertical ropes 5 are connected to the upper portions of the columns, and the upper ends of the side ropes 9 are anchored to the slopes b. The horizontal rope 6a is slidably supported at the upper part of each column, and both ends of each lower half horizontal rope 6b are anchored on both side slopes 9b, and the upper half of the wire mesh 1 absorbs rockfall energy by absorbing rockfall energy. In this method, the lower half of the wire mesh is laid on the ground such as the swirl portion a to receive the falling rock.

In the above-mentioned rock fall protection net construction method, the rock fall protection net 10 is constructed in a plurality of steps with a vertical interval in a swath-like portion a or the like, and is constructed in a plurality of steps.

In the pillar 7 for forming a pocket, which is applied to the above-mentioned method of netting for rock fall protection, hinges 7d are connected to anchors 7a provided on both side slopes b of the swivel portion a and the like in the vertical direction of the swivel portion. A pillar 7 built to be tiltable, a hanging rope 8a and a side rope 8b attached around the upper part of the pillar.
A plurality of brackets 7e, the suspension ropes 8a and the side ropes 8b connected to the bracket 7e by anchors 9a and 9b on both side slopes b, and an upper end provided at the upper end of the support and incorporated in the upper end of the wire mesh 1. A pillar device for forming a pocket for a rock fall protection net, comprising: a convex curved portion 7h for slidably supporting the horizontal rope 6a; and a guide metal fitting 7f for an upper end horizontal rope 6a attached to the convex curved portion 7h. It has become.

More specifically, as shown in FIGS. 1 and 2, the wire mesh 1 is formed to have a width corresponding to the swollen portion a by, for example, connecting in the width direction, and the vertical length is shorter than that of the conventional example. Is done. The wire mesh 1 has a vertical and horizontal reinforcing rope 2 of 1 m.
At the same time, the left and right vertical ropes 5 are installed on both the left and right sides, the upper edge is bent and the upper end horizontal rope 6a is installed, and a plurality of lower half horizontal ropes 6b are installed. It is assembled in the lower half at appropriate vertical intervals, and the connecting portions and crossing portions of these ropes are connected and reinforced by appropriate crumbs 4, respectively. The wire mesh 1 with the reinforcing ropes is basically remarkably reinforced and excellent. It has a strong toughness, and increases the strength, that is, the proof strength, corresponding to buffering and absorbing and receiving the large rock fall energy that falls from above in the swamp part a,
Basically, the protection performance against falling rocks is improved.

A column device for forming a pocket is shown in FIG.
An anchor 7a which is driven by a plurality of anchor bolts 7b on the solid ground on both side slopes b as shown in FIG.
A pillar 7 that is hinged upward and is built to be tiltable in the vertical direction F (inclination direction of the swirl portion a), a plurality of brackets 7e fixed around the upper portion of the pillar, and provided at the upper end of the pillar. And a plurality of anchor bolts on the solid ground on the slopes b on both sides of the swollen portion a, which comprises a convex curved portion 7h, a guide metal fitting 7f attached to the convex curved portion, a suspension rope 8a for supporting the column, a side rope 6a, and the like. 7b is cast (filling with special cement to increase the anchoring force) to form a strong anchor 7a, and the lower end of the column 7 is hinged 7d on this anchor 7a so as to be tiltable in the vertical direction F, Slope b on both sides
The suspension ropes 8a anchored above 9a are connected to the bracket 7e on the upper part of the column by appropriate means, and the side ropes 8b anchored on 9b are similarly connected to the bracket 7e on the upper part of the column to support the column. The upper ends of the left and right vertical ropes 5 of the wire mesh 1 are connected to the bracket 7e by the same means, and the upper end horizontal ropes 5 are slidably supported by the convex curved portions 7h and the guide fittings 7f provided at the upper ends of the columns. (Guided in a direction substantially perpendicular to the vertical direction F). The length of the column 7 is set in accordance with the height difference between the swirl part a etc. and the slopes b on both sides, and the upper part of the wire mesh 1 is held at an appropriate height on the swirl part a etc. The left and right ends of the upper end of the wire mesh 1 are supported, and the upper half thereof is a curtain-shaped pocket portion 10a.
It has a structure to be configured. At the lower part of the pocket portion 10a, a lower half horizontal rope 6b is provided as shown by a dotted line as necessary.
Laying.

As shown in FIG. 5, for example, as shown in FIG. 5, a plurality of anchor bolts 9d (filled with special cement) are used to anchor the anchor body 9c to both sides of the slope b, and the bolts secured to the anchor body 9c. It consists of a connecting plate 9e with a hole 9f and the like, and the anchor main body 9c is provided on both side slopes b.
Is fixed with an anchor bolt 9d, and the rope end formed by clipping the upper end of the suspension rope 8a with a turnbuckle or the like is clipped to a connection plate 9e. Various mechanisms are applied according to the conditions. A similar mechanism is applied to the anchor 9b.

In the rock fall protection net 10 shown in the drawing, as shown in FIGS. 1 and 2, the wire mesh 1 is composed of a left and right vertical rope 5, an upper end horizontal rope 6a and a plurality of lower half horizontal ropes 6b together with vertical and horizontal reinforcing ropes 2. Built-in reinforcement. Further, on the anchors 7a provided on the slopes b on both sides of the swirl part a, the pillars 7 for forming the pockets are hinged 7d, and the tilt in the vertical direction F (inclination direction of the swirl part a) is built in. The suspension ropes 8a and the side ropes 8b anchored on the both side slopes b above and on both sides are connected and supported by appropriate means to the bracket 7e on the upper part of the column 7, and the upper ends of the left and right vertical ropes 5 are supported by the respective columns. The upper horizontal rope 6a connected to the upper bracket 7e and anchored 9a on both side slopes b can be slid by a convex curved portion 7h provided at the upper end of each column 7 and a guide metal fitting 7f (inclination direction of the swirl portion a). , The upper end of the wire mesh 1 with reinforcing ropes is arranged at an appropriate height on the swirl portion a by the right and left columns 7, and both ends of the lower half lateral ropes 6b are provided. Anchors 9a on both side slopes b The pocket portion 10a substantially Uehan portion flop with wire mesh 1
And the lower half thereof is constructed as a rock fall protection net 10 constituted by a laying portion 10b laid on the ground such as a swath-like portion a. If necessary, a lower half lateral rope 6b is provided below the pocket portion 10a (not shown).

As described above, the wire mesh 1 of the present invention is provided with a plurality of left and right vertical ropes 5, an upper end horizontal rope 6a, and a plurality of lower half horizontal ropes 6b. Since the rope 2 is significantly reinforced by being incorporated therein, it has excellent strength and proof strength which sufficiently absorbs, absorbs, and receives and supports large rock falling energy falling from above, such as the swirl portion a. Therefore, the number of the pillars 7 for forming the pockets can be reduced and the interval between them can be greatly increased. As shown in the figure, the pillars 7 can be erected on both sides of the swollen part a at intervals of several tens of meters. The wire mesh 1 with reinforcing ropes can be supported only by the left and right columns 7 built above the wire mesh 1 on both sides.

As shown in the figure, the struts 7 for forming the pockets are formed on both side slopes b of the relatively rigid ground-like portion a due to a large increase in the strength, that is, the strength, of the wire mesh 1 with the reinforcing ropes as described above. To anchor 7a and hinge connection 7d
It is easily built with high accuracy and power. In addition, it is supported by the hanging ropes 8a and the side ropes 8b to prevent the tilting in the lateral direction, and the convex curved portion 7h at the upper end of the column.
And the guide metal fitting 7f slidably supports the upper horizontal rope 6a incorporated in the upper end of the wire mesh 1, so that the impact applied to the upper portion of the column 7 from the metal mesh 1 via the upper horizontal rope 6a is remarkably reduced. The eccentric load acting as the deformation force of torsional lateral tilt is significantly reduced, effectively preventing damage to the strut and preventing collision with falling rocks, etc., has excellent strut function, reliability and durability Has been raised.

Further, as shown in FIG.
With the right and left columns 7 built at intervals, only the left and right sides of the wire mesh 1 with reinforcing ropes are directly supported via the vertical ropes 5, and the upper end horizontal rope 6 a between the columns 7 is greatly lengthened. The structure has a structure in which the wire mesh with reinforcing ropes 1 is supported substantially the entire width by the long upper side ropes 6a between the wires 7, and the elongation of the long upper side ropes 6a increases the elastic support of the wire netting 1 with reinforcing ropes, ie, buffering and absorption. In addition to the enhanced strength and strength of the wire mesh 1 with the reinforcing ropes, the excellent shock absorbing and absorbing performance of effectively absorbing and absorbing the rock fall energy of the swollen portion a is effectively achieved. Effective for a long time.

Also, due to the excellent buffering and absorbing performance as described above, the upper half of the wire mesh 1 with reinforcing ropes can be formed in the pocket portion 10a, and the lower half of the wire mesh 1 is provided with a plurality of lower halves having anchors 9b. The laying portion 10b is laid on the ground such as the swollen portion a by the horizontal rope 6b. Due to the toughness of the wire mesh 1 with the excellent reinforcing rope, moderate elasticity and strong proof strength, the support performance of each column 7 and the buffering and absorbing performance as described above, the pocket portion 10a is located above the swollen portion a. Effectively buffers and absorbs large rockfall energy falling from The laying portion 10b is supported by a plurality of lower half horizontal ropes 6b and laid on the ground such as the swirl portion a.
Due to the characteristics of (1), while the rock fall and the like buffered by the pocket portion 10a are received and supported, the fallen rock and the like that are received gradually descend and are dispersed and are effectively held for a long period of time. The protection performance, reliability and durability of falling rocks etc. are remarkably enhanced.
In addition, the length of the wire netting 1 can be reduced to about half, so that the wire netting 1 can be constructed extremely small. Construction is easy and significant cost savings are possible.

Further, as described in the second embodiment shown in FIG. 3, the rock fall protection nets 10 are arranged in a plurality of stages corresponding to the length and inclination of the swollen portion a and the like, and further to the bending.
The individual rock fall protection nets 10 can be constructed on a smaller scale, can be easily constructed, and cost can be reduced, so that the protection performance and reliability of rock fall and the like can be further improved as a whole.

[0024]

According to the present invention, the wire mesh having the above-described structure is provided with left and right vertical ropes, an upper end horizontal rope and a plurality of lower half horizontal ropes, and a number of vertical and horizontal reinforcement ropes. With built-in reinforcement, it effectively absorbs and absorbs large rock fall energy in swamps, etc., has excellent strength and proof strength to catch and support rock fall, etc. Basically, protection performance and reliability of rock fall Is significantly increased. In addition, each pillar is easily and accurately built strongly with anchors provided on both side slopes such as swamps, and is supported by side ropes in addition to hanging ropes to prevent lateral inclination and incorporated into wire mesh. Slidably supports the upper side horizontal rope, which significantly reduces the unbalanced load due to the torsional lateral tilt of the column.
It effectively enhances support performance, reliability and durability. In addition, the length of the upper end horizontal rope between the columns, its rope elongation is significantly increased, and the wire mesh with the reinforcing rope supported over almost the entire width by the long upper end horizontal rope,
The absorption performance is effectively enhanced. The wire mesh of this reinforcing rope is constructed with the upper half part in the pocket part and the lower half part in the laying part, and the rock fall in the pocket part due to the excellent strength, proof strength, strut performance and cushioning, absorption performance etc. as described above. Demonstrates excellent cushioning and absorption performance, etc., and excellent support for catching falling rocks at the laid part. It greatly enhances protection performance, reliability and durability as well as workability. In addition, the length of the wire mesh can be reduced, so that the construction can be performed on a small scale, and the construction cost can be reduced.

In addition, by constructing the rock fall protection net in a plurality of steps in a swamp portion or the like, the individual rock fall protection net can be easily constructed in a smaller scale, and the rock fall protection performance and reliability can be comprehensively improved. Is even higher.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a side view in the direction of arrows XX in FIG. 1;

FIG. 3 is a side view showing a second embodiment.

FIG. 4 is a side view (A) and a front view (B) showing an embodiment of a column for forming a pocket.

FIG. 5 is a side view (A) and a plan view (B) showing an embodiment of the anchor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire mesh 2 Vertical / horizontal reinforcement rope 5 Left / right vertical rope 6a Upper end horizontal rope 6b Lower half horizontal rope 7 Post 7a Anchor 7d Hinge connection 7e Bracket 7h Convex curved part 7f Guide metal fitting 8a Suspension rope 8b Side rope 10 Rock fall protection Net 10a Pocket part 10b Laying part a Swamp b Slope on both sides

Claims (3)

(57) [Claims] 1. Anchors provided on both side slopes such as swamps by reinforcing left and right vertical ropes, upper end horizontal ropes and a plurality of lower half horizontal ropes together with a number of vertical and horizontal reinforcing ropes in a wire mesh. The hinge of the left stone is connected to the upper part of the pillar and hinged to the vertical direction of the swamp, etc., and the ends of the hanging ropes and side ropes anchored on the slopes on both sides are connected to the upper part of each pillar and supported. The upper ends of the left and right vertical ropes are connected to the upper part of each pillar, and the upper end horizontal ropes with both ends anchored on both slopes are slidably supported at the upper part of each pillar,
Both ends of each lower half horizontal rope are anchored on the slopes on both sides, the upper half of the wire mesh is configured as a pocket that absorbs and absorbs rockfall energy, and the lower half of the wire mesh is above ground such as a swamp. A rock fall protection net construction method characterized in that it is constructed and constructed as a laying section that lays on a rock and receives rock fall. 2. The rock fall protection net construction method according to claim 1, wherein said rock fall protection net is constructed in a plurality of steps at a vertical interval in a swollen portion or the like. 3. A pillar for forming a pocket which is applied to the method for net fall protection according to claim 1 or 2, wherein the pillar is hingedly connected to an anchor provided on both side slopes such as a swath. A column built up so that the part can be tilted up and down, a plurality of brackets attached to the upper part of the column and connecting the hanging rope and the side rope, and anchored on both side slopes and connected to the bracket to support the column. A hanging rope and a side rope, a convex curved portion provided at the upper end of the column and slidably supporting an upper horizontal rope incorporated in a wire mesh, and a guide metal fitting for the upper horizontal rope attached to the convex curved portion. A pillar device for forming a pocket for a rock fall protection net.