JP2009249825A - Covering net-type slope protection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a covering net-type slope protection method which enables a slope to be accurately pushed downward by a net body, and which can prevent damage from being caused by a falling rock during a net body installation step and after the installation of the net body. <P>SOLUTION: This covering net-type slope protection method comprises: an upside horizontal rope installation step of stretching an upside horizontal rope 14 by an anchor 10 with a bend-deformable head; a net body spreading step of fixing the net body 100 with a predetermined width to the upside horizontal rope 14 and spreading it to a valley side; a three-way rope installation step of stretching a downside horizontal rope 18 and two vertical ropes 20 and 22, elongated in the vertical direction of the slope at a predetermined mutual interval, by means of the anchor 10; a net-body and rope connection step of connecting the net body 100 to the downside horizontal rope 18 and the two vertical ropes 20 and 22; and a net-body tensioning step of tensioning the net body 100 by fixedly installing an intermediate-portion anchor on natural ground so as to push the net body 100 to the side of the natural ground in a prescribed location in an intermediate area having four sides enclosed with the upside horizontal rope 14, the downside horizontal rope 18, and the two vertical ropes 20 and 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mesh-covered rock fall prevention method, and more particularly to a mesh-covered slope protection method in which a mesh body is extended and installed on the surface of a slope to prevent falling objects such as rock fall from the slope.

  The disasters caused by falling rocks and landslides on the slopes are constantly occurring, and many damages occur every year. In particular, roads and railroads are installed on mountainous areas and steep terrain along the coastline along with the development and expansion of the transportation network in recent years, so it is important to prevent disasters in areas where these slopes exist. It has become a business issue.

  Disaster prevention measures on such slopes include the installation of rockfall protection fences, etc. that protect the object by receiving rockfalls that have fallen from sources such as rockfalls, and mountains where rockfalls are likely to occur due to partial collapse There are known source countermeasure methods that protect slopes and suppress their occurrence. The covered net slope protection method is a kind of such a source countermeasure construction method, in which the net body is spread on the surface of the slope and fixed to the natural ground with an anchor or the like. Rather than catching rocks falling from the upper area of the slope as in the case of falling rock protection fences, the main purpose is to suppress the occurrence of falling objects by directly covering the source of falling objects on the slope surface. It is a function.

  As such a cover-net-type slope protecting method, techniques such as Patent Document 1, Patent Document 2, and Patent Document 3 are disclosed. Patent Documents 1 and 2 are applications relating to the present applicant, and Patent Document 1 is arranged such that a wire mesh produced with a wire having high tensile strength is spread on a slope to be protected, and pressure receiving plates are scattered at predetermined positions of the wire mesh. It is installed in a state. That is, the pressure plate is fixed to the natural ground with an anchor so that tension is applied to the metal mesh toward the natural ground.

  In Patent Document 2, a mesh body is extended and installed on a slope, so that a support plate is scattered from the upper surface side of the mesh body, and the support plate is pushed down toward the natural ground and fixed to the natural ground. Thus, the net body is fixed to a natural ground, and the fixing surface of the bearing plate is configured to be in a fixed position with respect to the surrounding natural ground surface. Thus, in the pressing process for fixing the bearing plate, the mesh body is stretched and tensioned, and when the fixing of the bearing plate is completed, a required tension is applied to the mesh body.

  Furthermore, the technology according to Patent Document 3 is a construction in which the entire protective mesh is composed of vertical and horizontal ropes and a metal mesh covering the rope (see paragraph “0007” of the same document). This is a tension type rock fall prevention method. According to this technology, the surface of the natural ground, which is the source of falling rocks, is covered with a net-like object made mainly by crossing vertical and horizontal ropes. These vertical and horizontal ropes are fixed to the ground with anchors and the like, and the impact energy generated by falling rocks is absorbed mainly by applying tension to the horizontal ropes.

JP 2001-11863 A JP-A-2005-350894 JP 2002-227140 A

  The above Patent Documents 1 and 2 disclose a technique for applying tension to the mesh body by installing a bearing plate and pressing the stretched mesh body against the ground surface. However, there is no disclosure of the entire process of installing the mesh body, and no process technology for ensuring a firm and stable overall fixing state of the mesh body from the work of spreading the mesh body.

  Moreover, although the technique of patent document 2 has set the installation surface position of a bearing plate lower than the other natural ground surface, it is necessary to make such an installation location low position, After the installation of the extension, further examination and countermeasures such as prevention of falling rocks during work in the process from installation of the bearing plate to the bearing plate are required.

  Moreover, although the technique which concerns on patent document 3 has covered the surface of the natural ground with the vertical and horizontal rope and the wire mesh installed from the upper surface, the ensuring of the action pressed down in the natural ground downward direction is not made | formed. That is, it can be understood from FIGS. 6, 7, 8, etc. of the same document that the tension applied to the lateral rope plays an important function and is not necessarily for pressing the ground surface. Therefore, the falling rocks generated by the collapse of the slope start to move and are captured by the net after starting to fall, so the load on the net is not as great as the falling rock prevention fence, but besides the weight of the falling rocks, Impact force due to the movement of falling rocks is also added. Therefore, a situation arises in which a stronger and stronger vertical and horizontal rope must be used.

  Moreover, in a natural ground with large irregularities such as an overhang, it is difficult to make the net body adhere to the surface of the natural ground, and the impact force of falling rocks may become larger. In addition, when the main part of the net is composed of vertical and horizontal ropes, it is easy to concentrate the force on the vertical and horizontal ropes where rocks fall or rock falls, and it is necessary to consider the occurrence of damage in the local area of the net. .

  The present invention has been made in view of the above-mentioned problems, and its purpose is to accurately press the surface of the slope downward by the mesh body, and to cause damage due to falling rocks in the installation process of the mesh body. The object of the present invention is to provide a net-type slope protection method that can be prevented.

In order to achieve the above-mentioned object,
In the cover mesh type slope protection method that prevents the occurrence of falling objects from the slope surface by extending the mesh body on the slope surface using anchors fixed to the natural ground,
An upper side rope installation step of fixing an anchor that can be bent and deformed according to the addition of a load at a predetermined height position of the slope with a predetermined interval, and an upper side rope is stretched between the anchors; The upper side portion of the mesh body having a predetermined width is fixed to the upper lateral rope, and the upper body is extended in a mesh body extending step of extending the mesh body to the valley side along the slope surface. The lower horizontal rope stretch extending in a substantially horizontal direction at a valley side position spaced from the rope by a predetermined distance, and the two vertical rope stretches extending vertically from the slope at a predetermined distance from each other are bent. A three-way rope installation step using a deformable anchor, a net / rope coupling step for coupling a portion of the net close to the lower lateral rope and the two vertical ropes, the upper lateral rope, the lower Surrounded on all sides by a lateral rope and two vertical ropes Characterized in that it comprises a and a mesh member tensioning step of tensioning the net assembly by an intermediate portion anchored to fixedly installed on the natural ground so as to press the mesh member to the ground mountain at a predetermined position of the mesh member in the region.

  According to the above configuration, first, the upper horizontal rope is installed using the anchor that can be bent and deformed, and the rope fixed to this is extended to the valley side, and the rope that extends in the other three directions is the anchor. Is stretched by. It should be noted that this network spreading process is preferably performed prior to the three-way rope installation process in order to facilitate the setting of the rope installation position, but is not necessarily limited to this, and the three-way rope installation process. After performing for the position surrounding the network spreading region, the network spreading process may be performed.

  Thereby, the extension of the net body and the installation of the rope extending in all directions surrounding the predetermined range are made for the area that is likely to be a source of falling rocks. In addition, since the head of the anchor bends and deforms within a predetermined range according to the load, the rope is stretched properly according to the slope shape, and further, the rope can be effectively cut off when the rope is stretched. Can be prevented. In addition, after the installation of the rope extending in all directions, even if there is a falling rock during the work in the area, the falling rock can be stopped in the area. That is, since it can be stopped in a situation before a large movement of rock falls, it can be reliably stopped, and the occurrence of a rock fall accident during work can be effectively suppressed.

  And an intermediate part anchor is installed in the predetermined location in the mesh body area | region enclosed by the four-way rope, and a mesh body comes to hold down a natural ground surface now. Further, at that time, the cutting of the mesh body is suppressed by the bending operation of the head of the anchor of the rope to which the mesh body is attached, and the pressing action by the mesh body on the more accurate ground is obtained.

The net-type slope protection method according to claim 2 is:
The anchor on which the upper side rope, the lower side rope, and two vertical ropes are stretched is configured as a wire rope anchor formed by combining or twisting a plurality of steel wires. With this configuration, it is possible to easily configure an anchor that bends and deforms its head in a predetermined range according to the load. That is, for example, the wire rope anchor can be bent and deformed in the direction of the action of tension on the head within a predetermined angle range with respect to the drilling axis without reducing its strength. Can function effectively.

The covered net slope protecting method according to claim 3 is:
In the network spreading step, a plurality of meshes having a predetermined width are attached in parallel to the upper lateral rope without being spaced apart, and are connected to each other at adjacent portions to form a desired lateral direction of the slope. The net width is ensured. Thereby, according to the condition of the slope of protection object, ie, according to the area | regions of generation sources, such as falling rocks, a net | network width | variety can be adjusted easily. Depending on the installation area of this mesh body, the area surrounded on all sides by the subsequent three-way rope installation process can also be adjusted, and enforcement according to the field situation of the slope is possible.

The covered net slope protection method according to claim 4 is:
A bearing plate is fixed to the intermediate anchor, and a predetermined portion of the mesh body is pressed against the ground by the bearing plate. Due to the presence of the pressure bearing plate, it is possible to accurately correspond the net body to the unevenness of the ground surface in the region surrounded by the rope. In addition, when the bearing plate is fixed by the intermediate anchor, the deformable anchor of the head is bent and deformed, preventing the net from being cut accurately and ensuring a more reliable pressing force on the ground surface. can do.

The covered net slope protection method according to claim 5 is:
The mesh body is a wire mesh net formed of a high-strength steel wire. By using a wire netting net in the configuration of the present invention, excellent dispersibility of stress in all directions can be utilized. In other words, in the case of a wire netting net, it has a structure that is excellent in vertical stretch / shrinkage and horizontal shrinkage / stretching, which is a vertical / horizontal deformation, depending on the situation of the rockfall source in the natural mountain. By installing it accurately, it is possible to achieve prevention by preventing the fall of rocks and the short fall distance when they occur.

The covered net type slope protection method according to claim 6 is:
The net body is a ring net formed by connecting a plurality of rings. By using a so-called ring net in the configuration of the present invention, excellent deformability can be utilized in addition to excellent dispersibility of stress in all directions. That is, in the case of a ring type net, the dispersibility of stress in all directions is excellent, but a large deformation is possible with respect to a large load, and it is possible to cope with a heavy rock fall. Therefore, by installing this according to the situation of the rockfall generation source on the slope, it is possible to prevent the rockfall and prevent it from occurring.

  As described above, according to the covered net type slope protecting method according to the present invention, rope rope cutting and net cutting during the installation and fixing work of the net to an area that is likely to be a source of falling rocks, etc. Can be effectively prevented. Finally, the falling rocks generated in the process of obtaining the pressing force by following the slope of the net body are accurately controlled, and the occurrence of the falling rock accident during the work can be effectively suppressed. Furthermore, ensuring the pressing force according to the shape of the natural ground surface in the net body region surrounded by the four-sided rope is more accurate, and the reliability of the reticulated slope protection method is improved. It is.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a covered net type slope protecting method according to an embodiment of the present invention will be described in detail based on the drawings. In FIG. 1, as a first step, a necessary anchor 10 is fixedly installed on the slope 200 where the rockfall generation source X-1 or X-2 exists, which is a portion where rockfall may occur (anchor installation step). The state in which is performed is shown. As shown in the figure, an anchor 10 for tensioning four ropes described later is installed so as to surround the rockfall generation sources X-1 and X-2. For this purpose, only the anchors 10-1 and 10-2 may be fixed, and the other anchors may be sequentially installed in each necessary step.

  In addition, the installation position of the anchor 10 in this embodiment is installed so that eight of the anchors 10-1 to 10-8 are located in four directions with the rockfall generation source X-1 or X-2 as the center.

  The anchor 10 is fixedly installed by driving the anchor 10 into the slope 200, that is, a natural ground to a predetermined depth. What is characteristic in the present invention is that the anchor 10 has a configuration in which the head can be bent and deformed within a predetermined range in accordance with the addition of a load while the anchor 10 is fixed.

  2 and 3 show an example of such an anchor. An anchor 10 shown in FIGS. 2A and 2B is a wire rope anchor, and a plurality of wires having a predetermined tensile strength are twisted to form an outer diameter of about 20 to 30 mm. Therefore, although it has the rigidity required as an anchor, when the head is pulled over a predetermined load in the driven state, the head portion can bend and deform in the pulling direction. For example, it can be deformed within a predetermined angle range with respect to the axis of the portion driven to a depth of 2 m to 5 m. FIG. 2A shows a state before bending deformation, and FIG. 2B shows a state in which bending deformation occurs in the pulled direction.

  FIG. 3 shows an anchor 12 using a lock bolt, which is a steel rod, instead of the wire rope anchor described above, and similarly has a configuration in which the head can be bent and deformed by a force exceeding a predetermined load. As in FIG. 2, FIG. (A) shows a state before being bent and deformed, and FIG. 2 (B) shows a state in which it is bent and deformed in the pulled direction.

  FIG. 4 shows a state in which the following two steps are performed, that is, the upper side between the upper left and right anchors 10-1 and 10-2 fixed at a substantially common height position of the slope 200. A lateral rope 14 is stretched (upper lateral rope installation step). The suspension work of the upper lateral rope 14 is performed by a normal work while avoiding the occurrence of falling rocks.

  And the net | network body 100 is being fixed to this upper side horizontal rope 14, and is extended to the trough side. That is, the upper side portion of the mesh body 100 having a predetermined width is fixed to the upper lateral rope 14, and the mesh body 100 is extended so as to spread toward the valley side along the slope surface (network body extending step).

  In the present embodiment, the two nets 100-1 and 100-2 are juxtaposed without being spaced apart, and their upper ends are firmly fixed to the upper lateral rope 14. Further, the two nets 100-1 and 100-2 are joined so that the net part is not lost firmly at the side part in contact with each other. In this way, by joining a plurality of nets 100, a desired net width in the lateral direction of the slope 200 is ensured. Therefore, the net width is adjusted according to the size of the area of the falling rock generation source of the slope 200 to be protected. In the present embodiment, for example, a scale with a horizontal width of 20 to 50 m and a vertical width of 10 to 30 m is assumed.

  FIG. 5 shows a predetermined distance from the upper lateral rope 14 with respect to the stretched net body 100, that is, a space that can sufficiently surround the falling rock generation source X-1 or X-2, and the valley side position. A lower lateral rope 18 extending in the lateral direction (substantially horizontal direction) is stretched. As illustrated, it is stretched by anchors 10-3 and 10-4. Further, the two vertical ropes 20 and 22 are stretched in the vertical direction of the inclined surface 200 at a predetermined interval in the lateral direction so that the rockfall generation sources X-1 and X-2 can be sufficiently surrounded. As shown in the figure, they are stretched using anchors 10-5, 10-6 and 10-7, 10-8, respectively (three-way rope installation step).

  In this state, the rockfall generation source X-1 or X-2 is surrounded by the ropes of the upper lateral rope 14, the lower lateral rope 18, and the vertical ropes 20 and 22, from the four sides. The ropes 14, 18, 20, and 22 form a rectangular intermediate region Y. Here, an operation of firmly joining the corresponding sides of the mesh body 100 to the ropes 14, 18, 20, and 22 so as not to generate a gap (net body / rope joining process) is performed.

  Further, a plurality of auxiliary anchors 11 are installed along the ropes at positions close to the upper lateral rope 14, the lower lateral rope 18, and the vertical ropes 20 and 22 in the intermediate region Y. The auxiliary anchor 11 prevents the ropes 14, 18, 20, and 22 from being pulled inward and bent in the pulling direction as much as possible when the net body 100 is tensioned by installing an intermediate anchor described later. It is an anchor for. That is, when each rope is pulled inward, the movement inward is restricted at that position due to the presence of the auxiliary anchor 11. In addition, the auxiliary anchor 11 is provided with a plate body (not shown) for pressing the rope from above, and it is also possible to prevent the rope to be regulated from being pulled and moved beyond the head of the auxiliary anchor 11. Is possible.

  Thereby, the basic covering net installation with respect to the falling rock generation source X-1 or X-2 of the net body 100 has been performed. In the work so far, the operator does not need to enter the area of the rockfall generation source X-1 or X-2, and gives an impact or vibration to the rockfall generation source X-1 or X-2. It is possible to avoid the falling rocks and collapse caused by things.

  FIG. 6 shows that the intermediate anchor 30 is installed in a state where the mesh body 100 is fixed at a predetermined position in the intermediate region Y of the mesh body 100 surrounded by the rope stretched in the above four directions (network tensioning process). ) Indicates the state. In the present embodiment, seven intermediate anchors 30 are installed, and the installation point of the intermediate anchor 30 is pushed down to the natural ground surface side, and the net body 100 leads the natural ground surface. . That is, the pressing function of the net body 100 following the unevenness of the ground mountain surface 100 in the intermediate region Y is obtained. Further, when the intermediate anchor 30 is installed, the head of the anchor 10 to which the ropes 14, 18, 20, 22 to which the mesh body 100 is fixed is bent according to the applied load, and the mesh body is operated. 100 cutting is suppressed.

  As a result, the pressing action of the net body 100 against an accurate ground is obtained. Further, each intermediate anchor 30 is provided with a bearing plate 32, and the mesh body 100 is pressed by the bearing plate 32, so that the more stable operation of pushing down the mesh body 100 by the intermediate anchor 30 is stabilized. It has become a thing. At this time, the presence of the auxiliary anchor 11 accurately prevents the ropes 14, 18, 20, and 22 from moving by being pulled inward.

  Further, as described above, in the state where the installation of the four-way ropes is completed and the connecting work of the net body 100 to each rope is completed, the occurrence of falling rocks occurs in the intermediate region Y surrounded by the four-way ropes. Even so, you can stop falling rocks in that area. Therefore, the operator can be protected during the installation work of the intermediate anchor 30.

  The intermediate anchor 30 is preferably configured using a lock bolt. For example, a support plate 32 is attached to the head of the lock bolt, and the intermediate anchor 30 is fixed to a natural ground so as to press the intersection of the mesh body. Is. Of course, depending on the condition of the natural ground, this intermediate anchor 30 can also be configured as an anchor whose head can bend and deform within a predetermined range in accordance with the addition of a load. Thus, in the process of sequentially fixing the intermediate anchor 30 to the natural ground, the pushing operation of the mesh body 100 becomes flexible, and the cutting of the mesh body 100 during work is accurately prevented.

  Next, the net 100 in the above embodiment will be described. In the configuration of the present invention, the structure of the mesh body 100 is not particularly limited. For example, a plurality of high-strength hard steel wires having an outer diameter of 3 mm to 4 mm are twisted to form a wire rod for the mesh body 100. In the case of a wire mesh net formed by use, for example, a rhombus wire mesh, excellent dispersibility of stress in all directions can be utilized. In other words, in the case of a rhombus wire mesh, it is excellent in vertical stretch / shrinkage and horizontal shrinkage / elongation, which are vertical and horizontal deformations, and by installing this accurately according to the situation of the rock fall source of the natural mountain, It is possible to achieve prevention of falling rocks and further prevention with a short falling distance when it occurs.

  The net body 100 can also be configured by a so-called ring net formed by connecting a plurality of rings. Each ring is formed, for example, as a ring having a diameter of 200 mm to 600 mm by using a high-strength hard steel wire having an outer diameter of 3 mm as an element wire and winding the same. When this ring type net is used, in addition to excellent dispersibility of stress in all directions, excellent deformability can be utilized. In other words, the ring net is excellent in the dispersibility of stress in all directions, but it can be deformed greatly against a large load, and even if a heavy rock fall occurs, this fall prevention can be achieved accurately. it can.

  Next, based on FIG. 7, the slope protection function when the netting slope protection method according to the present embodiment is constructed will be described. In this figure, for example, in a situation where a rockfall generation source X3 indicated by a broken line that is a region where rockfall is a concern exists in a certain part of the slope 200, the net body 100 is installed so as to cover it. . The installation work process is as described above, and the head of the anchor 10 is bent as shown in FIG. 2 (B) according to the load, and the net body 100 includes the upper lateral rope 14 and the lower side. The horizontal rope 18 and the vertical ropes 20 and 22 are firmly stretched. Thereby, the falling rock generation source X3 is pressed down firmly from all sides.

  As described above, the net body 100 is installed and fixed while the rocks are stopped during the fall of rocks during the work and the workers are protected during the work. And since the intermediate | middle part anchor 30 provided with the bearing plate 32 is installed in the predetermined location of the net body 100, ie, the location which can hold down the falling rock generation source X3 exactly, generation | occurrence | production of falling rock in this area | region is carried out. It is definitely prevented.

  That is, the rock fall generation source X3 is pressed down by the net body 100 and kept in the state, so that the occurrence of rock fall is prevented. Moreover, even if a fall of rocks or the like occurs in the rockfall generation source X3, it can be stopped within a range surrounded by four-way ropes. This can be stopped in a situation before a large movement of rocks and the like starts, so that it is possible to reliably stop rockfalls in a small energy state and eliminate the source of a large disaster.

  In addition, this invention is not limited to the structure of said each embodiment, A various deformation | transformation is possible within the range of the summary of invention. For example, the number of installed mesh bodies 100 is appropriately set depending on the scale of the slope 200. Also, the number of joints between the anchor 10 and each rope can be variously selected depending on the state and scale of the installation area. In addition, as for the horizontal rope, in the above-described embodiment, an example in which one horizontal rope is installed at each of the vertical positions has been described. It is preferable that the number of horizontal ropes is increased accordingly. In addition, as above-mentioned, you may perform any of a mesh body extending process and a three-way rope installation process previously.

It is explanatory drawing which shows the initial stage process of the covering net type | mold slope protection construction method which concerns on embodiment of this invention. (A) And (B) is explanatory drawing which shows the structural example of the anchor used for embodiment, (A) is the state before a deformation | transformation, (B) has each shown the deformed state. (A) And (B) is explanatory drawing which shows the other structural example of the anchor used for embodiment, (A) is the state before a deformation | transformation, (B) has each shown the deformed state. It is explanatory drawing which shows the process regarding the spreading | diffusion of the net | network body of the cover type | mold slope protection method concerning embodiment of this invention. It is explanatory drawing which shows the intermediate | middle process of the covering net type | mold slope protection construction method which concerns on embodiment of this invention. It is explanatory drawing which shows the last process of the covering net type | mold slope protection construction method which concerns on embodiment of this invention. It is operation | movement explanatory drawing of this Embodiment in the slope where the netting type slope protection construction method which concerns on embodiment of this invention was constructed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wire rope anchor 11 Auxiliary anchor 12 Normal steel anchor 14 Upper side horizontal rope 18 Lower side horizontal rope 20, 22 Vertical rope 30 Intermediate | middle part anchor 32 Bearing plate 100 Net body 200 Slope X Falling rock source Y Intermediate area

Claims (6)

In the cover mesh type slope protection method that prevents the occurrence of falling objects from the slope surface by extending the mesh body on the slope surface using anchors fixed to the natural ground,
An upper side rope installation step of fixing an anchor that can be bent and deformed according to the addition of a load at a predetermined height position of the slope with a predetermined interval, and an upper side rope is stretched between the anchors;
A network body extending step of fixing the upper side portion of the network body having a predetermined width to the upper lateral rope, and extending the network body to the valley side along the slope surface;
In the installation area of the mesh body, a stretch of a lower horizontal rope extending in a substantially horizontal direction at a valley side position spaced from the upper horizontal rope by a predetermined distance, and extending in a vertical direction of the slope at a predetermined interval from each other A three-way rope installation step in which two vertical ropes are stretched using the bendable anchor;
A net / rope coupling step for coupling adjacent portions of the net to the lower lateral rope and the two vertical ropes;
An intermediate anchor is fixedly installed on the natural ground so as to press the net toward the natural ground at a predetermined location in the network area surrounded by the upper lateral rope, the lower lateral rope, and the two vertical ropes. A network tensioning process for tensioning the mesh body,
Covered slope protection method characterized by including   The upper horizontal rope, the lower horizontal rope, and the anchor on which two vertical ropes are stretched are configured as wire rope anchors formed by combining or twisting a plurality of steel wires. Item 2. The net-type slope protection method according to item 1. The network spreading process includes
A plurality of nets having a predetermined width are attached to the upper horizontal rope in parallel without being spaced apart, and a desired net width in the lateral direction of the slope is ensured by connecting to each other at adjacent portions. The covered net type slope protecting method according to any one of claims 1 and 2.   The intermediate part anchor is provided with a bearing plate, and a predetermined part of the mesh body is pressed against a natural ground by the bearing plate. Covered slope protection method. The net is
The covered net type slope protecting method according to any one of claims 1 to 4, wherein the net type net protecting net is formed of a high strength steel wire. The net is
The covered net type slope protecting method according to any one of claims 1 to 6, wherein the net type slope protecting method is a ring type net formed by connecting a plurality of rings.

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