JPH10168831A - Pocket type rock fall preventing net for snow coverage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a perfect measure to snow load to eliminate deterioration of the performance and quality of a wire gauze, and save the cost of material and works and the maintenance cost by dividing a net into a plurality of vertical stages, and pulling up and fixing the lower stage net part on the front surface side of the upper stage net part. SOLUTION: A net is divided into two upper and lower stages, and net parts 1, 2 of the lower stage side and upper stage side are connected in such a manner as to be lifted up by a shackle 3. Namely, the upper horizontal rope 4 of the lower stage net part 1 and the lower horizontal rope 5 of the upper stage net part 2 are inserted to the shackle 3, and each horizontal rope 4, 5 is connected to a common anchor 7 by connecting means 6, and the middle horizontal rope 12 of the upper stage net part 2 is connected to an anchor 14 by connecting means 13. In a normal protecting position, the lower horizontal rope 8 of the lower stage net part 1 is connected to an anchor 10, and fastened by a turn buckle 11. Hook metal fittings on the lower ends of a plurality of ropes provided on a jig suspended by a crane are caught by the lower horizontal rope 8 of the lower stage net part 1, and the lower stage net part 1 is pulled up so as to be superposed on the front surface side of the upper stage net part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a snow fall pocket type rock fall protection net installed on a slope such as a mountainous area or a coastal area having a large amount of snow.

[0002]

2. Description of the Related Art A pocket-type rock fall protection net is a rock fall protection facility designed to form an opening by installing a support post on a wire mesh covering a slope and dropping rock from the upper part of the slope into the opening. However, in the Tohoku / Chubu mountainous regions and the coast of the Sea of Japan from Akita to Tottori,
In the daytime, the snow covered in the pockets of the wire mesh fuses with the snow on the road surface during the day, and this freezes at night, resulting in an excessive snow load. Accidents such as tearing have occurred.

[0003] As a countermeasure against this snow load, there have been taken a method of doubling the anchor for the hanging rope, attaching an anchor to the auxiliary rope, and removing the whole rock fall protection net in winter. In this method, the cost of initial material construction increases significantly due to the increase in the number of installation points for anchors.In this method, installation and removal of protective nets are repeated every year, which increases maintenance and management costs and increases the performance of components such as wire mesh. There is a problem that the quality tends to deteriorate.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a thorough countermeasure against snow load, to significantly reduce initial material construction costs as compared with the anchor reinforcement method, and to maintain and reduce the maintenance costs as compared with the total removal method. An object of the present invention is to provide a pocket-type rock fall protection net for snowfall which can remarkably save the cost and does not deteriorate the performance quality of a wire net or the like.

[0005]

Means for Solving the Problems The gist of the present invention is to provide a pocket type rock fall protection net by dividing the net vertically into two or three or more stages and raising the lower net portion to the front side of the upper net portion. To suspend it. Other configurations are the same as the basic configuration of the conventional pocket rock fall protection net.

As described above, the lower net portion close to the road surface is pulled up to the front side of the upper net portion, and the snow covered in the pockets of the upper net portion is separated from the snow on the road surface. Therefore, there is no possibility that an excessive snow load is applied to the rock fall protection net by fusing together during the snow melting period.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS When the net is divided into two stages, the only lower net portion is always raised. When the net is divided into three or more stages, one or two or more stages are raised in order from the lowest one closest to the road surface according to the assumed snowfall in the installation area.

As a method of raising the lower side net portion, the lower side net portion and the upper side net portion are rotatably connected by connecting means, and the lower side net portion is flipped up with the connecting member as a center of rotation while the lower side net portion is in an expanded state. There is a method and a method of sequentially winding up the lower net portion in a roll shape from the lower edge side. In order to facilitate the lifting operation, it is preferable that the lower side net portion is divided into strips having a constant width in the lateral direction. In the case of a divided structure, it is desirable to overlap the left and right ends of adjacent divided net portions.

The connecting means is not limited to various metal fittings and members such as a shackle and a winding grip, as long as it allows relative rotation between the lower net portion and the upper net portion. A loop formed on the rope itself can also be used. The lower net portion raised to the front side of the upper net portion is preferably overlapped with the upper net portion,
It is connected to suspending means provided at an appropriate place on the upper side net portion, or suspending means installed on a slope.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIGS. 1 to 7, the rock fall protection net is divided into upper and lower two stages. The lower side net portion 1 and the upper side net portion 2 are connected by a connecting means including a shackle 3 so as to be able to flip up and rotate. That is, as shown in FIGS. 4 and 5, the upper horizontal rope 4 of the lower side net portion 1 and the lower horizontal rope 5 of the upper side net portion 2 are inserted through the shackle main body 3a. The sealing pin 3b is hung so as not to be pulled out. Upper horizontal rope 4 and lower side net portion 2 of lower side net portion 1
Are connected to a common anchor 7 by connecting means 6.

The connecting means 6 is constituted by a winding grip. The winding grip 6 is commercially available,
As illustrated in FIG. 8, a loop portion 6a is formed in a middle portion of a wire from a plurality of strands, and twisting is given to both leg portions 6b and 6c connected to the loop portion 6a at a predetermined pitch.
In use, the two leg portions 6b and 6c are sequentially wound around the lower horizontal rope 5 along a twist so that the end of the lower horizontal rope 5 is located at the root of the loop portion 6a as shown in FIG. Attached. The loop portion 6a is connected to the anchor 7 directly or via another member. As shown in FIG. 10, a loop portion 5 a may be formed at the end of the lower horizontal rope 5 with a wire clip 32, and the loop portion 5 a itself may be used as the connection means 6.

The left half of FIG. 1 shows a state in which the lower side net portion 1 has not been pulled up yet. When in the proper protective position as described above, the end of the lower horizontal rope 8 of the lower side net portion 1 is connected to the anchor 10 by the connecting means 9, and is appropriately tensioned by the operation of the turnbuckle 11 inserted in the middle. Have been. This connecting means 9 is formed of a winding grip similarly to the connecting means 6. Various types of turnbuckles 11 can be used as illustrated in FIGS. 11 to 13. The turnbuckle of FIG. 1 is obtained by screwing a connecting shaft having an eye portion 11a into both ends of a buckle body, and the turnbuckle of FIG. 12 is connecting the connecting shaft having a hook portion 11b to both ends of the buckle body. In the turnbuckle shown in FIG. 13, the connecting shaft having the eye portion 11a is screwed into one end of the buckle body, and the connecting shaft having the shackle portion 11c is screwed into the other end of the buckle body. It is.

The right half of FIG. 1 shows a state in which the lower net portion 1 is pulled up so as to overlap the front side of the upper net portion 2. This lifting work is carried out on a suitable scaffolding means or heavy equipment.
Is rotated upward about the lower horizontal rope 5 of the upper net portion 2 while being pulled by the lower net portion 1. In order to perform the work more efficiently, as shown in FIG. 15, a lifting jig 33 is hung by a towing member 38 at the tip of an operation arm 37 of a heavy machine such as a crane, and a plurality of jigs provided on the jig 33 are provided. Can be hooked to the lower horizontal rope 8 of the lower side net portion 1.

An end of the intermediate horizontal rope 12 of the upper side net portion 2 is connected to an anchor 14 by connecting means 13. The connection means 13 is formed of a winding grip, similarly to the connection means 6. The upper hook 15a of the S-shaped hanging fastener 15 is hung on the intermediate horizontal rope 12 at regular intervals. When the lower side net portion 1 is flipped up and rotated around the lower side rope 5 of the upper side net portion 2, the lower side rope 8 of the lower side net portion 1 is connected to the lower end hook portion 15b of the S-shaped hanging fastener 15. Can be hung. As a result, the lower side net portion 1 is suspended so as to overlap the upper side net portion 2.
The work of hanging the lower horizontal rope 8 on the S-shaped hanging fastener 15 is performed by an operator who climbs on the upper side net portion 2 or comes down with a lifeline from the cliff. The lower horizontal rope 8 of the lower side net portion 1 which is lifted up in this manner is connected to the anchor 14 by the connecting means 9.
, And is appropriately tensioned by the operation of the turnbuckle 11. This connecting means 9 is formed of a winding grip similarly to the connecting means 6.

In addition to the embodiment in which the turnbuckle 11 is flipped up together with the lower net portion 1, the lower horizontal rope 8 of the lower net portion 1 is divided just before the turnbuckle 11 as shown in FIG. Alternatively, the turnbuckle 11 may be left connected to the anchor 10 together with the divided lower horizontal rope 8a. In order to efficiently perform the dividing operation, it is desirable to use a turnbuckle 11 having a shackle portion 11c as illustrated in FIG.

Depending on the length of the lower side net portion 1 and the upper side net portion 2 in the longitudinal direction, the S-shaped hanging fastener 15 may be an intermediate horizontal rope 16 or an upper horizontal rope further above the upper side net portion 2. It is hung by 17. Also, the upper side net portion 2
Intermediate horizontal ropes 12 and 16 and upper horizontal rope 1
7 instead of connecting to the upper side net portion 2
It is also possible to separately suspend a hanging rope, and hang an S-shaped hanging fastener on the hanging rope.

Depending on the shape of the slope to be laid, an auxiliary rope for lifting operation is attached to the lower side net portion 1,
The auxiliary rope is hung on the intermediate horizontal rope 12 or the upper horizontal rope 17 of the upper side net portion 2 and placed.
During the lifting operation, the auxiliary rope may be pulled from the road surface 19 or from a scaffolding means or a heavy working machine.

Apart from the above-mentioned embodiment, as the connecting means for connecting the lower side net portion 1 and the upper side net portion 2 so as to be turnable,
The winding grip 30 can be used as in the embodiment shown in FIG. This winding grip 30 is the same as the connection means 6. In use, the two leg portions 30b and 30c are sequentially wound around the vertical rope 22 along a twist so that the end of the vertical rope 22 of the lower side net portion 1 is located at the root of the loop portion 30a. . The upper horizontal rope 4 of the lower net portion 1 is inserted into the loop portion 30a. Another winding grip 31 is mounted on the vertical rope 23 of the upper side net portion 2. The two leg portions 31b and 31c are sequentially wound around the vertical rope 23 along the twist so that the end of the vertical rope 23 is located at the root of the loop portion 31a of the winding grip 31. A shackle 29 is connected to the loop portion 31a, and the shackle 29 is fitted to the loop portion 30a of the winding grip 30 of the lower net portion 1. When the lower side net portion 1 is flipped up and rotated, the lower horizontal rope 8 of the lower side net portion 1 is connected to the intermediate horizontal rope 12 in the same manner as in the above-described embodiment by an S-shaped hanging fastener 15.
At the lower end hook 15b. As a result, the lower side net portion 1 is suspended so as to overlap the upper side net portion 2.

The connecting means for rotatably connecting the lower side net portion 1 and the upper side net portion 2 includes a loop portion 22a of the vertical rope 22 of the lower side net portion 1 as in the embodiment shown in FIG. It can be used as such. The loop portion 22a is provided with a wire clip 3 at the end of the vertical rope 22.
2 is formed. As the wire clip, for example, a root portion of a loop portion is fitted into a U-shaped main body, and a nut is fastened to the root portion by a nut fitted to a screw leg of the U-shaped main body. The upper horizontal rope 4 of the lower net portion 1 is inserted into the loop portion 22a. A winding grip 31 is attached to the vertical rope 23 of the upper side net portion 2. The two leg portions 31b and 31c are sequentially wound around the vertical rope 23 along the twist so that the end portion of the vertical rope 23 is located at the root of the loop portion 31a of the winding grip 31. A shackle 29 is connected to the loop portion 31a, and the shackle 29 is fitted to the loop portion 22a of the vertical rope 22 of the lower net portion 1.
When the lower side net portion 1 is flipped up and rotated, the lower horizontal rope 8 of the lower side net portion 1 is connected to the intermediate horizontal rope 12 in the same manner as in the above embodiment, and the lower end hook of the S-shaped hanging fastener 15 is provided. Hooked on the portion 15b. As a result, the lower net portion 1 is suspended and held in a state of being superposed on the upper net portion 2.

The connection means 6, 13 and the like include:
Not limited to the winding grip, a hook fitting or the like can be used.

[0021]

As described above, in the snowfall pocket type rock fall protection net according to the first aspect of the present invention, the net is divided vertically into two or three or more stages, and the lower net portion is in front of the upper net portion. The snow covered on the upper side net and the snow on the road surface are completely separated from each other. No snow load measures are taken.
Unlike the countermeasures for removing the entire protective net in winter, only the lower net part close to the road surface is pulled up, so the man-made number and heavy equipment used are significantly lower, and the maintenance and management costs can be greatly reduced. . Since the lower side net portion is hung on the front side of the upper side net portion, it is not necessary to secure a storage space and there is no management burden as compared with a method of removing the entire protection net.

In the pocket-type rock fall protection net for snow accumulation according to the second aspect of the present invention, the lower net portion and the upper net portion are rotatably connected by the connecting means. As a result, the workability is improved in an orderly manner in the unfolded state, and there is no deterioration in the performance quality of the wire mesh or the like.

In the pocket-type rock fall protection net for snow accumulation according to the third aspect of the present invention, the connecting means is constituted by a shackle, and the upper horizontal rope of the lower net portion and the lower horizontal rope of the upper net portion are passed through the shackle body. Since only the commercially available shackles and horizontal ropes that can be added at a low cost are used to reduce the snow load, the initial material construction cost can be significantly reduced as compared with the anchor reinforcement method.

According to a fourth aspect of the present invention, in the pocket-type rock fall protection net for snowfall, the connecting means is constituted by a winding grip, and a lower portion is provided on a loop portion of the winding grip attached to an upper end portion of a vertical rope of a lower side net portion. Since the upper horizontal rope of the side net is inserted and the only added member for snow load countermeasures is a commercially available wound grip that can be obtained at low cost, the initial material construction cost is lower than the anchor reinforcement method. You can save a lot.

In the pocket-type rock fall protection net for snow accumulation according to the fifth aspect of the present invention, the loop means formed at the end of the vertical rope of the lower net portion constitutes connecting means, and the loop portion is provided with the lower net portion. Since the upper horizontal rope is inserted, the only additional material for snow load countermeasures is a commercially available wire clip that can be obtained at low cost, so the initial material construction cost can be significantly reduced compared to the anchor reinforcement method .

According to the sixth aspect of the present invention, there is provided a pocket type rock fall protection net for snow accumulation, wherein an S-shaped suspension is provided on a middle horizontal rope, an upper horizontal rope, or a hanging rope which is stretched separately from the upper side net portion. The lower horizontal rope of the lower side mesh part which is hooked on the upper end hook part of the fastener is hung on the lower end hook part of the S-shaped hanging fastener, and the joining work of the hanging fastener and the horizontal rope is performed. Is done smoothly and easily.

[Brief description of the drawings]

FIG. 1 is a front view showing a use state of a snowfall pocket type rock fall protection net according to one embodiment of the present invention.

FIG. 2 is a left side view when the lower part of the rock fall protection net is not pulled up.

FIG. 3 is a left side view when the lower part of the rock fall protection net is pulled up.

FIG. 4 is an enlarged view of a portion A in FIG. 1, showing a state in which an upper horizontal rope of a lower net portion and a lower horizontal rope of an upper net portion are turnably connected by a shackle.

FIG. 5 is a left side view showing the connection state of FIG. 4;

FIG. 6 is an enlarged view of a portion B in FIG. 1 and shows a state in which an upper horizontal rope of a lower net portion is connected to an intermediate horizontal rope of an upper net portion by S-shaped hanging fasteners.

FIG. 7 is a left side view showing the connected state of FIG. 6;

FIG. 8 is a front view of a winding grip that can be used as a connecting means or a connecting means in the rock fall protection net.

FIG. 9 is a front view showing a mounting process of the winding grip.

FIG. 10 is a front view when a loop formed at the end of the rope itself is used as connecting means or connecting means.

FIG. 11 is a front view showing an example of a turnbuckle that can be used in the rock fall protection net.

FIG. 12 is a front view showing another example of a turnbuckle that can be used in the rockfall protection net.

FIG. 13 is a front view showing another example of the turnbuckle that can be used in the rock fall protection net.

FIG. 14 is a view showing another embodiment of the present invention, in which the lower net portion and the upper net portion can be turned by the winding grip attached to the vertical rope of the lower net portion in the pocket type rock fall protection net for snowfall. It is a principal part enlarged view which shows the connected state.

FIG. 15 is a perspective view of a lifting jig that can be used for the rock fall protection net.

FIG. 16 is a front view showing a use state of a pocket snow fall protection net for snow cover according to another embodiment of the present invention.

FIG. 17: In a pocket-type rock fall protection net for snowfall according to still another embodiment of the present invention, the lower net portion and the upper net portion are turnably connected by the loop portion of the vertical rope itself of the lower net portion. It is a principal part enlarged view which shows the state performed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower net | network part 2 Upper net | network part 3 Connecting means consisting of a shackle 4 Upper horizontal rope of a lower net part 5 Lower horizontal rope of an upper net part 6 Connection means consisting of a winding grip 7 Anchor for horizontal ropes 8 Lower side Lower horizontal rope of net part 9 Connecting means consisting of winding grip 10 Anchor for horizontal rope 11 Turnbuckle 12 Middle horizontal rope of upper side net part 13 Connecting means consisting of winding grip 14 Anchor for horizontal rope 15 S-shaped suspension Component 16 Another intermediate horizontal rope of the upper side net part 17 Upper side rope of the upper side net part 18 Slope 19 Road surface 20 Connection means consisting of winding grip 21 Horizontal rope anchor 22 Vertical rope of lower side net part 23 Upper side Vertical rope of net portion 24 Suspended rope 25 Turnbuckle 26 Connection means consisting of winding grip 27 Suspended rope Anchor 28 hinged strut 29 connecting means with 31 vol grip consisting Grip shackle 30 Volume 32 wire clip 33 pulling jig

Claims (6)

[Claims] 1. A pocket-type rock fall protection for snowfall, wherein a net is divided into two or three or more vertical stages, and a lower net portion is lifted and suspended on a front side of an upper net portion. network. 2. The lower net portion and the upper net portion are rotatably connected by connecting means.
The pocket-type rock fall protection net for snow cover described in. 3. The connecting means is constituted by a shackle,
The pocket type rock fall protection net for snowfall according to claim 2, wherein an upper horizontal rope of the lower net portion and a lower horizontal rope of the upper net portion are inserted into the shackle body. 4. The connecting means is constituted by a winding grip, and the upper horizontal rope of the lower net portion is inserted into the loop portion of the winding grip attached to the upper end of the vertical rope of the lower net portion. The snow fall pocket type rock fall protection net according to claim 2. 5. The connecting means is constituted by a loop portion formed at the end of the vertical rope of the lower net portion, and the upper horizontal rope of the lower net portion is inserted through the loop portion. 2. Pocket type rock fall protection net for snow cover according to 2. 6. A lower stage in which an upper hook portion of an S-shaped hanging fastener is hung on an intermediate horizontal rope or an upper horizontal rope of the upper net portion or a hanging rope stretched separately from the upper net portion, and is turned. 6. The pocket type rock fall protection net for snowfall according to claim 2, wherein a lower horizontal rope of the side net portion is hung on a lower hook portion of the S-shaped hanging fastener.