JP6132416B1 - Slope stabilization structure - Google Patents

Abstract

A slope stabilization structure capable of stably pressing down a slope over a long period of time is provided. A reinforcing member 3 such as a lock bolt is inserted into a slope 1, a nut 4 is screwed onto the head of the reinforcing member 3, and a coil spring 5 is disposed between the nut 4 and the slope 1. The coil spring 5 is in a compressed state, and in particular, a net 2 is laid on the slope 1, and a reinforcing material 3 is inserted in a predetermined position of the laying area of the net 2. 5, the head of the reinforcing member 3 is inserted inside the coil spring 5, and the lower end portion of the wire rod of the coil spring 5 is hooked on the net 2. [Selection] Figure 2

Description

  The present invention relates to a slope stabilization structure for stabilizing a slope.

  For example, as a slope stabilization method, for example, the one described in Patent Document 1 below has been proposed. In this construction method, a wire mesh made of hard steel wire is spread on a slope, and pressure receiving plates are scattered on the wire mesh. Then, a female screw member is screwed to the head of the anchor, and the female screw member is tightened to press the pressure receiving plate against the metal mesh.

  However, the height of the surface of the slope is not always maintained even after construction. For example, after construction, the topsoil of the slope may partially flow out and the height of the part may be lowered. If the height of the surface of the slope is partially reduced in this way, a space will be created between the wire mesh and the surface of the slope at that portion, and the force to press the slope by the wire mesh will be insufficient or lost. It will be. As described above, the conventional method has a problem that it cannot follow the downward change of the slope surface after the construction, and there is a problem that the predetermined pressing force by the wire mesh is likely to be insufficient after the construction. Even if the slope does not descend, the female screw member gradually loosens due to vibration or the like, and there is a possibility that the force pushing the slope is insufficient.

JP 2001-11863 A

  Therefore, the present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a slope stabilization structure that can stably press down a slope over a long period of time.

The present invention was made to solve the above problems, and the slope stabilization structure according to the present invention has a reinforcing material such as a lock bolt inserted into the slope and a net laid on the slope. are nuts screwed on the head have a mesh of the net is inserted head of the reinforcing member, the head of the reinforcing member inside of the coil spring be disposed coil spring between the nut and the net There have been inserted, co Irubane the Ri compressed state near the lower end side of the wire of the coil spring is characterized by being hooked to the net.

  In the slope stabilizing structure having such a configuration, a nut is screwed onto the head of the reinforcing member protruding from the slope, and a coil spring is disposed between the nut and the slope, and the nut is tightened. The coil spring is in a compressed state. Therefore, the spring force of the coil spring acts on the slope from above, and the slope is pressed down by the spring force. Therefore, even if the slope is lowered after the construction, the coil spring follows and continues to push the slope. The spring force of the coil spring also acts on the nut from below. Therefore, loosening of the nut is prevented after construction.

  In particular, when the slope is a natural slope, a net is laid on the slope, a reinforcing material is inserted at a predetermined location in the laying area of the net, and a coil spring is disposed between the nut and the net. Is preferred. In this configuration, the spring force of the coil spring acts on the net from above, and the net is pressed against the ground by the spring force. Therefore, even if the ground surface of the natural slope partially flows out after the construction, the spring force of the coil spring acts on the net, so that the net can follow the height change of the ground surface. Therefore, erosion and outflow of surface sediment can be suppressed over a long period of time, and the slope can be stabilized.

Co Irubane acts the spring force of the coil spring directly to the net in the structure abutting the net. In the configuration in which the coil spring contacts the net in this way, the wire rod of the coil spring has a circular cross section, so that the net is not cut or damaged by the coil spring .

  Moreover, it is preferable that the head of the reinforcing material is inserted through the inside of the coil spring, and the construction is easy. In addition, the reinforcing material is often inclined rather than perpendicular to the slope, but even in such a case, the coil spring can be deformed according to the inclination of the reinforcing material and pressed against the net. Force can be applied reliably.

  Moreover, it is preferable that the lower end part side of the wire material of a coil spring is hooked on the net, and a net position shift is prevented. In addition, since the net and the coil spring are connected, the displacement of the net is prevented not only by the reinforcing material but also by the coil spring. In addition, since the coil spring wire has a circular cross section, it is possible to prevent the net from being cut or damaged even if the coil spring wire is hooked on the net.

Moreover, it is preferable that the coil spring has a truncated cone shape that expands in a spiral shape toward the lower side. Thus, when the coil spring has a truncated cone shape, the upper end surface thereof has a relatively small diameter. Accordingly, the nut for compressing the coil spring from the upper side is small, and the unit cost can be suppressed, and the nut tightening operation is facilitated. Further, the upper end surface of the coil spring can be directly pressed with a small nut without interposing a receiving seat between the nut and the coil spring. On the other hand, the lower end surface of the coil spring has a relatively large diameter. Accordingly, the spring force can be applied over a wide range at the lower end surface of the coil spring . Laying net slopes, in presses structure the net coil spring, it is possible to press a wide range of net coil spring. In particular, when the lower end of the coil spring wire is entangled with the net, the lower end of the coil spring can be easily hooked to the net, and the wire is hooked at multiple locations on the net. In addition, the connection with the net is further strengthened, and the net can be prevented from being displaced .

  As described above, since the coil spring is arranged in a compressed state between the nut and the slope, even if the slope surface height changes after construction, it can be easily followed by the spring force of the coil spring, and the slope is securely pressed. You can continue. Further, the spring force prevents the nut from loosening. Therefore, the slope can be stabilized over a long period of time.

The top view which shows the construction example of the slope stabilization structure in one Embodiment of this invention. The perspective view which shows the principal part of the slope stabilization structure. The top view which shows the principal part of the slope stabilization structure. The front view which shows the principal part of the slope stabilization structure. It is a coil spring used for the slope stabilization structure, (a) is a front view, (b) is a top view. The top view which shows the positional relationship of the reinforcing material and net | network in the principal part of the slope stabilization structure. The top view which shows the principal part of the slope stabilization structure as a reference example . The front view which shows the principal part of the slope stabilization structure. It is a bearing plate used for the slope stabilization structure, (a) is a front view, (b) is a bottom view. The perspective view which shows the principal part of the slope stabilization structure. The top view which shows the principal part of the slope stabilization structure in other embodiment of this invention. The top view which shows the connection state of the coil spring and net | network in the principal part of the slope stabilization structure. The front view which shows the principal part of the slope stabilization structure. The top view which shows the principal part of the slope stabilization structure as a reference example . The front view which shows the principal part of the slope stabilization structure. The front view which shows the principal part of the slope stabilization structure as a reference example . The front view which shows the principal part of the slope stabilization structure as a reference example . The top view which shows the construction example of the slope stabilization structure as a reference example . The A section enlarged view of FIG. The front view which shows the principal part of the slope stabilization structure. The top view which shows the construction example of the slope stabilization structure as a reference example . The B section enlarged view of FIG.

  Hereinafter, a slope stabilization structure according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing one construction example of the slope stabilizing structure in the present embodiment, and is particularly suitable for suppressing erosion and outflow of earth and sand on the surface layer of the slope 1. In the present embodiment, a case where the slope 1 is a natural slope with remaining vegetation will be described. Therefore, the surface of the slope 1 is the surface of a natural mountain. The surface layer of the slope 1 is particularly a layer having a depth of 2 m or less from the ground surface, and is suitable for preventing the surface layer from collapsing and preventing the topsoil from flowing out. In the slope stabilizing structure, a net 2 is laid on the slope 1 and a reinforcing material 3 (anchor) such as a lock bolt is inserted into a predetermined location of the laying area of the net 2. In FIG. 1, only a part of the laying area of the net 2 is shown. The reinforcing material 3 is arrange | positioned at predetermined intervals, for example in each of two directions orthogonal to each other. Specifically, the slope direction (inclination direction) of the slope 1 is defined as the longitudinal direction, and the direction perpendicular to the longitudinal direction and parallel to the slope 1 is defined as the lateral direction, with a predetermined interval in each of the longitudinal and lateral directions. Be placed. In addition, in FIG. 1, although the aspect of the staggered arrangement | positioning which shifted the reinforcing material 3 for every row and has arrange | positioned in the zigzag form is illustrated, the aspect of the square arrangement | positioning arrange | positioned at the grid | lattice form of a grid or a square form may be sufficient. . Although the interval between the adjacent reinforcing members 3 is also arbitrarily set according to the situation at the site, for example, the interval can be set to 2 m × 2 m.

  The detail of the principal part of the slope stabilization structure is shown in FIGS. The slope stabilizing structure in the present embodiment includes the above-described net 2 and the reinforcing material 3, a nut 4 screwed to the head of the reinforcing material 3, and a coil spring disposed between the nut 4 and the net 2. 5.

<Net 2>
The net 2 may have various materials and shapes, but in the present embodiment, the net 2 is formed in a net shape from a resin material (wire). For example, a material having a wire diameter of 1 to 5 mm can be used, and a material having a diameter of 2 to 4 mm is particularly preferable. Moreover, as resin of a raw material, it is a product made from polyester, for example, It can be set as the monofilament made from polyester. The tensile strength of the material is preferably 200 to 600 N / mm ² , for example.

  Further, the shape of the mesh 20 of the net 2 is arbitrary, but it is particularly preferable that one mesh 20 has a hexagonal shape as shown in FIGS. 2 and 3. The mesh 20 which is a hexagon is formed of two materials. The hexagon of the mesh 20 is composed of a total of three opposing sides facing each other, and each of the pair of opposing sides is formed by twisting two materials. Therefore, of the six sides, two opposite sides have a stranded wire structure (twist structure), and the remaining four sides have a single wire structure. In addition, the space | interval between two opposing sides which are a strand wire structure can be 30 mm-80 mm, for example, It is preferable to set it as 50 mm especially. Although the mesh 20 may be a regular hexagon, it is particularly preferable that the mesh 20 is a hexagon that is long in the direction along two opposing sides having a stranded wire structure.

<Reinforcing material 3>
As described above, the reinforcing members 3 are arranged at predetermined intervals in the laying area of the net 2. Specifically, as shown in FIGS. 3 and 6, the head of the reinforcing material 3 passes through the mesh 20 of the net 2. For the reinforcing member 3, a rod-shaped steel material is usually used, and specifically, a lock bolt, a deformed bar steel, a screw node steel, a self-piercing bolt, or the like is used. In a corrosive environment, those coated with various resins such as epoxy resin, continuous fiber reinforced rods, and the like are also used. When the surface layer of the slope 1 tries to slide, the reinforcing material 3 resists and suppresses the sliding force of the surface layer of the slope 1. For the purpose of preventing the surface layer of the slope 1 from collapsing and slipping as in the present embodiment, it is sufficient that the reinforcing material 3 is inserted to the same depth as the surface layer of the slope 1, for example 0.5-1. Inserted to a depth of 5m. Therefore, the length of the reinforcing material 3 is also a length corresponding to the surface layer.

  An injection material (not shown) is used for fixing the reinforcing material 3. That is, a hole (not shown) is formed in the inclined surface 1, the reinforcing material 3 is inserted into the hole, and an injection material is filled in a gap between the hole and the reinforcing material 3. Fixed. The injection material plays a role of load transmission between the slope 1 and the reinforcing material 3 and a role of protecting the reinforcing material 3. For example, cement milk or mortar is used as the injection material.

  The length of the reinforcing member 3 and the length (depth) of the drilled hole depend on the desired depth to prevent collapse, but at least the length of the reinforcing member 3 is made longer than the length of the drilled hole. The head protrudes upward from the ground surface by a predetermined length. For example, for the purpose of suppressing only erosion and outflow of earth and sand on the surface layer of the slope 1, the length of the reinforcing material 3 is set to 50 cm, for example. On the other hand, the length of the reinforcing material 3 is set to 100 cm, for example, for the purpose of preventing a phenomenon (a void) in which the soil mass in the range surrounded by the adjacent reinforcing materials 3 tries to escape the reinforcing material 3. In any case, the head of the reinforcing member 3 protrudes upward from the surface (ground surface) of the slope 1 by a predetermined length. The heading length of the reinforcing member 3 that is the protruding amount protruding from the inclined surface 1 is, for example, 5 cm to 20 cm. This can be attached to the head of the reinforcing member 3 with the nut 4 or the coil spring 5 as a fixing tool. It is said that it is necessary length. In addition, it is preferable to galvanize the surface of the reinforcing material 3, and it is preferable to apply to the head at least among the full length. In addition, the reinforcing material 3 is basically inserted perpendicularly to the inclined surface 1, but in practice, it is often not inserted vertically but inclined.

<Coil spring 5 and nut 4>
A nut 4 and a coil spring 5 are attached to the head of the reinforcing member 3. In the present embodiment, since the support plate is not used, the coil spring 5 is directly disposed on the upper side of the net 2 without the support plate. Further, the head of the reinforcing member 3 is inserted through the coil spring 5. In this embodiment, the coil spring 5 is not a constant diameter from one end to the other end, but has a truncated cone shape that gradually increases in diameter from the upper side toward the lower side as shown in FIG. It looks spiral. Therefore, the upper end surface 5a of the coil spring 5 has a relatively small diameter, and the lower end surface 5b has a relatively large diameter. The coil spring 5 may be right-handed or left-handed, but is preferably right-handed. Therefore, the wire rod of the coil spring 5 gradually increases in diameter clockwise (clockwise) from the upper end to the lower end in plan view.

  The size of the lower end surface 5b of the coil spring 5 may be variously changed depending on the size of the mesh 20 of the net 2, but is at least larger than the size of the mesh 20 of the net 2 as shown in FIG. There are a total of six meshes 20b around the mesh 20a of the net 2 through which the reinforcing material 3 is inserted, but the lower end surface 5b of the coil spring 5 is more than the mesh 20a at the center. It is preferable that the size is large and positioned on all of the six surrounding meshes 20b. On the other hand, the size of the upper end surface 5a of the coil spring 5 can be variously changed depending on the size of the nut 4. However, the upper end surface 5a of the coil spring 5 can be pressed over the entire circumference by at least the end surface of the nut 4. In addition, it is preferable that the diameter of the lower end surface 5b of the coil spring 5 is 2 to 5 times the diameter of the upper end surface 5a. As an example, the diameter (upper end diameter) of the upper end surface 5a of the coil spring 5 is 30 mm, and the diameter (lower end diameter) of the lower end surface 5b is 100 mm. The total length (overall height) of the coil spring 5 is also arbitrary. For example, the length of the coil spring 5 is larger than the diameter of the upper end surface 5a of the coil spring 5 and smaller than the diameter of the lower end surface 5b of the coil spring 5.

  Although the coil spring 5 is positioned above the net 2, the coil spring 5 and the net 2 are in an intertwined connection state. That is, the lower end side of the wire rod of the coil spring 5 is hooked on the net 2, thereby connecting the coil spring 5 and the net 2. More specifically, the lower end side of the wire rod of the coil spring 5 passes below the material of the net 2. There are various ways of hooking the wire material of the coil spring 5 and the net 2. For example, as shown in FIG. 3, the wire material of the coil spring 5 is inserted through the lower side of every other material of the net 2 in the circumferential direction. Although it can be set as a mode, it may be set as a mode in which all lower sides are inserted instead of every other side, or a mode in which lower sides are inserted every other side. The length of the coil spring 5 at which the lower end side of the wire rod is entangled with the net 2 is also arbitrary, but at least the lower side of one side of the net 20 of the net 2 may be inserted. It is preferable that the lower side is inserted not only once but twice or more. And it is preferable that one or more turns on the lower end side of the wire rod of the coil spring 5 is entangled with the net 2, and preferably one or more turns and two or less turns. If the coil spring 5 is wound clockwise, the coil spring 5 can be inserted through the lower side of the net 2 while being rotated clockwise (clockwise) when viewed from above, and the direction in which the nut 4 is tightened Since the winding direction of the coil spring 5 is the same, the frictional force and the rotational force act on the upper end surface 5a of the coil spring 5 in the direction in which the amount of catching on the net 2 increases due to the tightening operation of the nut 4. become. Therefore, the hook of the coil spring 5 on the net 2 does not have to be loosened by tightening the nut 4.

  The nut 4 is located above the coil spring 5. The nut 4 is screwed to the head of the reinforcing member 3, and the coil spring 5 is compressed by tightening the nut 4. The nut 4 has a hexagonal cross section. A receiving seat (washer) may be interposed between the nut 4 and the coil spring 5.

<Construction procedure>
Next, the outline of the construction procedure of the slope stabilization structure will be described. First, holes are formed in the slope 1 at predetermined intervals. The depth of the hole is made a predetermined amount shallower than the length of the reinforcing material 3 to be used. Then, the reinforcing material 3 is inserted after filling the hole with the injection material, or the reinforcing material 3 is inserted first into the hole and then the injection material is filled. In any case, the reinforcing material 3 is integrated with the slope 1 by the injection material. Further, the head of the reinforcing material 3 is projected from the slope 1 for a predetermined length. Next, a net 2 is laid on the slope 1. The net 2 is laid along the slope 1 so as not to float from the slope 1. Further, as shown in FIG. 6, the reinforcing material 3 passes through the mesh 20 of the net 2.

  Then, a coil spring 5 is extrapolated to the head of the reinforcing member 3 protruding upward from the net 2, and the coil spring 5 is rotated so that the lower end side of the wire is inserted below the net 2. Entangling the net 2. Thereafter, the nut 4 is screwed onto the head of the reinforcing member 3 and tightened to compress the coil spring 5 by a predetermined amount, and the spring force of the coil spring 5 is applied to the net 2 to press the net 2 against the slope 1. When the nut 4 is screwed to the reinforcing material 3, a rust inhibitor such as grease is applied to the head of the reinforcing material 3, or a rust inhibitor is applied to the inner peripheral surface of the nut 4. May be. Moreover, it is preferable that the head of the reinforcing material 3 protrudes upward from the nut 4.

  In the slope stabilization structure as described above, the coil spring 5 is disposed between the nut 4 and the net 2, and the coil spring 5 is compressed by tightening the nut 4, so that the construction is completed. In this case, the spring force of the coil spring 5 acts on the net 2 from above, and the net 2 is firmly pressed against the ground by the spring force. Even if the ground surface partially flows out after the construction, the net 2 remains pressed against the ground surface because the spring force of the coil spring 5 acts on the net 2. Further, since the spring force acts on the nut 4 upward, the nut 4 is also difficult to loosen. Since the spring force of the coil spring 5 continues to act on the net 2 in this way, even if the slope 1 is lowered after the construction, it can be easily followed by the spring force of the coil spring 5, and the net 2 can be reliably and continuously maintained. It can be pressed against the ground surface. Accordingly, the slope 1 can be stably pressed over a long period of time, and the collapse of the surface layer can be prevented over a long period of time.

  In particular, the present embodiment has a configuration in which a pressure bearing plate is not used, and therefore has the advantage that the number of parts is small, the configuration is simple, and the construction cost is low including construction. Further, since the wire rod of the coil spring 5 has a circular cross section, the net 2 is prevented from being cut or damaged even if the coil spring 5 abuts against the net 2.

  Moreover, since the head of the reinforcing material 3 is inserted through the inside of the coil spring 5, it is only necessary to attach the coil spring 5 so that the head of the reinforcing material 3 covers the head during the construction, and the construction is easy. Even if the reinforcing material 3 is inclined with respect to the inclined surface 1, the coil spring 5 is freely deformed corresponding to the inclination of the reinforcing material 3, so that the spring force can be reliably applied to the net 2. it can. Further, a spherical seat having a spherical surface is not necessary, and can be tightened with a nut 4 having a flat bottom surface 5b.

  Furthermore, since the lower end side of the wire rod of the coil spring 5 is hooked on the net 2, the net 2 is not easily displaced. Since the reinforcing material 3 is inserted through the mesh 20 of the net 2, the displacement of the net 2 is suppressed by the reinforcing material 3, but when the net 2 and the coil spring 5 are further connected, the net 2 is also connected by the coil spring 5. Therefore, the positional deviation is suppressed. Since the wire rod of the coil spring 5 has a circular cross section as described above, the net 2 can be prevented from being cut or damaged even when the wire rod of the coil spring 5 is hooked on the net 2. In particular, when the coil spring 5 is hooked on the net 2 with a hook amount of not less than one round and not more than two rounds, the connection between the net 2 and the coil spring 5 is further ensured, and is positioned below the net 2. The amount of the wire of the coil spring 5 can be reduced, the net 2 can be prevented from lifting, and the spring force can be sufficiently applied to the net 2 from above.

  Moreover, since the coil spring 5 has a truncated cone shape, the nut 4 can be small, and the unit cost can be suppressed and the nut 4 can be tightened easily. Further, the upper end surface 5 a of the coil spring 5 can be directly pushed by the nut 4 without using a receiving seat between the nut 4 and the coil spring 5. Furthermore, since the lower end surface 5b of the coil spring 5 has a large diameter, a large area of the net 2 can be pressed by the lower end surface 5b of the coil spring 5, and the net 2 is made to act on the net 2 by effectively applying the spring force to the net 2. Can be adhered to. In particular, as shown in FIG. 3, when the six meshes 20b positioned around the mesh 20a through which the reinforcing material 3 is inserted can be pressed by the coil spring 5, the net 2 can be pressed in a wide area with a good balance. it can. Thus, the pressing force (clamping force) of the nut 4 acting concentrated on the upper end surface 5a of the coil spring 5 is expanded to a large area toward the lower end surface 5b by the truncated cone-shaped coil spring 5 and transmitted to the net 2. As a result, the tightening force of the nut 4 acts on the net 2 efficiently. On the contrary, since the spring force of the coil spring 5 is concentrated and acts on the nut 4, it is possible to reliably prevent the nut 4 from loosening. Furthermore, since the lower end surface 5b of the coil spring 5 has a relatively large diameter, the coil spring 5 can be easily hooked when the lower end portion of the wire rod of the coil spring 5 is hooked on the net 2, and the work is facilitated. Furthermore, since the wire rod of the coil spring 5 can be hooked on the plurality of meshes 20 of the net 2, the connection with the net 2 is further strengthened, and the displacement of the net 2 can be prevented more reliably.

  In the present embodiment, the net 2 is directly pressed by the coil spring 5 without using the support plate, but a spring force may be applied to the net 2 through the support plate. For example, the bearing plate 6 may be interposed between the net 2 and the coil spring 5 as shown in FIGS. A through hole 60 is formed in the center portion of the support plate 6 so that the reinforcing material 3 is inserted through the through hole 60. The shape of the support plate 6 is arbitrary, but as an example, it can be circular as shown in FIG. And it is preferable that the nail | claw part 61 protrudes in the outer edge part of the bearing plate 6 toward the downward direction. It is preferable that the claw portion 61 is integrally formed by sheet metal bending or the like. Although the number and arrangement of the claw portions 61 are arbitrary, for example, six pieces can be provided at regular intervals as shown in FIG. 9, for example, but other than this, for example, two pieces, three pieces, four pieces, etc. can be provided at regular intervals. It is also possible to provide a plurality of claw portions 61. In any case, when the claw portion 61 is provided on the pressure bearing plate 6, the claw portion 61 and the net 2 are locked, so that the displacement of the net 2 can be reliably prevented. In particular, when six claw portions 61 are provided, as shown in FIG. 7, a total of six meshes 20b positioned around the mesh 20a of the net 2 through which the reinforcing material 3 is inserted are surrounded. The nail | claw part 61 can be inserted one by one in all, and the latching location of the net | network 2 and the bearing plate 6 will be six. Therefore, the displacement and movement of the net 2 can be reliably prevented by the support plate 6. The claw portion 61 of the bearing plate 6 is preferably pushed into the slope 1.

  Although the size of the bearing plate 6 is arbitrary, it is preferable that the bearing plate 6 has a diameter larger than at least the lower end surface 5 b of the coil spring 5 so that the lower end surface 5 b of the coil spring 5 does not protrude outward from the bearing plate 6. In the example of FIG. 7, the lower end surface 5 b of the coil spring 5 is slightly smaller than the bearing plate 6, but the diameter of the lower end surface 5 b of the coil spring 5 is equal to the diameter of the bearing plate 6 as shown in FIG. 10. About half may be sufficient. However, preferably, the diameter of the lower end surface 5b of the coil spring 5 is more than half of the diameter of the bearing plate 6 so that the spring force of the coil spring 5 can be applied to the peripheral portion of the bearing plate 6 efficiently. The bearing plate 6 can be easily stabilized.

  Thus, in the configuration in which the bearing plate 6 is interposed between the coil spring 5 and the net 2, the spring force of the coil spring 5 acts on the net 2 via the bearing plate 6. Since the support plate 6 is plate-shaped, a spring force acts on the net 2 from the entire lower surface of the support plate 6. That is, the spring force can be distributed and acted on the area of the net 2 corresponding to the area of the lower surface of the bearing plate 6. Therefore, it is possible to prevent the spring force from acting locally on a part of the net 2 and to press the net 2 uniformly. Moreover, the bearing plate 6 can be made larger than the lower end surface 5 b of the coil spring 5, and the spring force can be evenly applied to a large area of the net 2 by making it larger. Even in such a case, since the coil spring 5 has a truncated cone shape, the peripheral side of the bearing plate 6 can be pressed by the lower end surface 5b of the coil spring 5, so that even if the bearing plate 6 is large, the spring can be efficiently used. Force can be applied.

  In addition, as described above, even when the reinforcing material 3 is inclined with respect to the bearing plate 6, the coil spring 5 is deformed so that the bearing plate 6 is inclined or the reinforcing material 3 is inclined. Since it follows easily, a spring force can be made to act on the bearing plate 6 reliably, without using a ball seat.

  Furthermore, when the nail | claw part 61 is provided in the bearing plate 6, the nail | claw part 61 can also be plunged into the slope 1 and the bearing plate 6 can be stabilized easily. In addition, when the net 2 tries to be displaced along with the outflow of the topsoil on the slope 1, the claw portion 61 of the bearing plate 6 is locked to the net 2 to prevent the movement of the net 2, thereby further shifting the position of the net 2. It can be surely prevented and the outflow of topsoil can be prevented more reliably. In particular, if the claw portion 61 is inserted into the mesh 20b positioned so as to surround the mesh 20a of the net 2 through which the reinforcing material 3 is inserted, the support plate 6 is excessively enlarged. In addition to the cost increase due to the above, the displacement of the net 2 and the outflow of the topsoil can be effectively prevented by cooperation with the reinforcing material 3. In that case, as shown in FIG. 7, the claw portions 61 are inserted one by one into all the meshes 20b surrounding the mesh 20a of the net 2 through which the reinforcing material 3 is inserted (a total of six in FIG. 7). By doing so, the displacement of the net 2 can be prevented more reliably.

  In addition, although the said embodiment demonstrated the case where the truncated-cone-shaped coil spring 5 was used, you may use the cylindrical (column-shaped) coil spring 5 with a constant diameter. In the structure which does not use the bearing plate 6, for example, there are structures as shown in FIGS. Moreover, in the structure using the bearing plate 6, there exists a structure as shown in FIG.14 and FIG.15, for example. In any configuration, if a disc-shaped receiving seat 7 is interposed between the upper end surface 5 a of the coil spring 5 and the nut 4, a nut 4 smaller than the coil spring 5 can be used. Further, by using the cylindrical coil spring 5, a general-purpose coil spring 5 can be used, and the cost can be suppressed. When the coil spring 5 is brought into direct contact with the net 2, the lower end portion of the coil spring 5 may be entangled with the net 2 as shown in FIG. FIG. 12 shows only the lower end side of the coil spring 5 (a little for one turn). Further, when the bearing plate 6 is interposed between the coil spring 5 and the net 2, for example, the bearing plate 6 and the receiving seat 7 may have the same diameter. In addition, it is good also as a structure which the nut 4 contact | abuts directly to the upper end surface 5a of the coil spring 5 so that the receiving seat 7 may be abbreviate | omitted and the large sized nut 4 may be used.

  In the above-described embodiment, the lower end portion of the coil spring 5 is entangled with the net 2 in the configuration in which the coil spring 5 abuts on the net 2. The arrangement may be as follows.

  Further, the claw portion 61 is provided on the bearing plate 6, but the claw portion 61 may be omitted. That is, the bearing plate 6 may be flat. The shape of the support plate 6 can be variously changed and may be not only circular but also polygonal.

  Furthermore, although the coil spring 5 is configured to be inserted through the head of the reinforcing member 3, a configuration in which the coil spring 5 is not inserted may be employed. For example, a plurality of small coil springs 5 may be arranged around the reinforcing material 3.

  Further, the shape of the mesh 20 of the net 2 may be a polygon such as a rhombus, a square, a rectangle, or a pentagon.

  In the above embodiment, the net 2 is laid on the slope 1, but the net 2 may not be laid. For example, as shown in FIG. 16, the coil spring 5 may be in direct contact with the slope 1. Moreover, as shown in FIG. 17, it is good also as a structure which puts the bearing plate 6 in the slope 1 and arrange | positions the coil spring 5 on it. Although FIG. 17 shows a case where the pressure bearing plate 6 has a flat configuration without the claw portion 61, a configuration having the claw portion 61 may be used. Thus, various members may be interposed between the coil spring 5 and the slope 1. Further, the slope 1 may be an artificial slope artificially made by cutting, embankment, or the like, in addition to a natural slope where vegetation remains.

18 to 20, the net 2 may be formed by combining a plurality of ring-shaped ring units 71 without being fixed to each other. The ring unit 71 is formed in a square shape as shown in FIG. The ring unit 71 is formed by forming a wire 72 formed by twisting a plurality of strands into a ring shape. The ring unit 71 includes a joint tool 73 for coupling and decoupling predetermined locations in the circumferential direction of the wire 72. With the joint tool 73, a predetermined portion of the ring unit 71 can be released or connected in a ring shape. The ring unit 71 is, for example, a square having a side of about 50 cm.

  A net 2 as shown in FIG. 18 is formed by combining such ring units 71 in a plane. A reinforcing material 3 is placed at a predetermined position of the intersection of the nets 2. For example, the reinforcing material 3 is driven in a staggered manner at intervals of about 2 m, which is the length of four ring units 71. The reinforcing material 3 is located between the corners of the combined two ring units 71. That is, the reinforcing material 3 is located inside each of the two ring units 71 combined.

  FIG. 20 shows a cross-sectional view of the portion of the reinforcing material 3. A sheath tube 76 is attached to the outside of the reinforcing material 3 so as to be covered. The sheath tube 76 is made of, for example, resin, protects the reinforcing material 3 mainly on the ground surface portion of the slope 1, and exhibits a rust prevention effect. Further, an upper bearing plate 74 and a lower bearing plate 75 are used as the bearing plates. The corners of the two ring units 71 are sandwiched between the upper bearing plate 74 and the lower bearing plate 75. However, the net 2 is not completely fixed by the upper bearing plate 74 and the lower bearing plate 75, and the ring unit 71 is sandwiched to the extent that the ring unit 71 can move to some extent along the inclined surface 1. The lower support plate 75 has a thin plate shape, while the upper support plate 74 is formed thicker. The lower bearing plate 75 is larger in plan view than the upper bearing plate 74, and has a larger diameter when circular. On the lower surface of the upper bearing plate 74, a plurality of protrusions 74a, specifically, three protrusions are provided. The convex portions 74a are formed at equal intervals in the circumferential direction. When the convex portion 74a abuts against the lower pressure plate 75, a predetermined gap is formed between the upper pressure plate 74 and the lower pressure plate 75, and the net 2 is positioned in the gap. The coil spring 5 is positioned above the upper bearing plate 74, and the nut 4 is positioned above the coil spring 5. The coil spring 5 abuts on the upper surface of the upper bearing plate 74. Accordingly, the spring force of the coil spring 5 is transmitted from the upper bearing plate 74 to the lower bearing plate 75 and from the lower bearing plate 75 to the slope 1.

  Further, the ring unit 71 may be other than a square shape, and may be, for example, a triangular shape as shown in FIGS. As shown in FIG. 21, in addition to the net 2 by the ring net 71, it is preferable that the wires 80 and 81 are stretched in the vertical direction and the horizontal direction, respectively. The reinforcing material 3 is arranged at the intersection. The vertical wire 80 and the horizontal wire 81 are arranged, for example, on the lower side of the net 2 by the ring unit 71, but may be arranged upside down. And the bearing plate 6 which has the nail | claw part 61 as mentioned above is arrange | positioned above the wires 81 and 81 and the net | network 2. As shown in FIG.

DESCRIPTION OF SYMBOLS 1 Slope 2 Net 3 Reinforcement material 4 Nut 5 Coil spring 5a Upper end surface 5b Lower end surface 6 Bearing plate 7 Receiving seat 20 Mesh 20a Mesh 20b Mesh 60 Through hole 61 Claw portion 71 Ring unit 72 Wire material 73 Joint tool 74 Upper bearing plate 74a Convex portion 75 Lower support plate 76 Sheath tube 80 Vertical wire 81 Horizontal wire

Claims (4)

A reinforcing material such as a lock bolt is inserted on the slope and a net is laid on the slope, the head of the reinforcing material is inserted through the mesh of the net, and a nut is screwed on the head , between the nut and the net is inserted through the inside of the coil spring head of the reinforcement has been arranged coil spring, co Irubane the Ri compressed state near the lower end side of the wire of the coil spring is hooked to the net slope stabilizing structure, characterized by that. 2. The slope stabilizing structure according to claim 1 , wherein a lower end portion side of the wire material of the coil spring is hooked by a net material located around a net of the net through which the reinforcing material is inserted . The slope stabilizing structure according to claim 1 or 2 , wherein a lower end portion side of the wire rod of the coil spring is inserted under every other net material in the circumferential direction . The slope stabilization structure according to any one of claims 1 to 3 , wherein the coil spring has a truncated cone shape that expands in a spiral shape toward the lower side.

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