JP2019094692A - Slope face stabilization structure - Google Patents

Abstract

To provide a slope face stabilization structure capable of firmly pressing a net to a slope face, and capable of effectively preventing positional dislocation of the net along the slope face.SOLUTION: A slope face stabilization structure comprises a net 2 laid on a slope face of soil, a reinforcement material 3 such as a lock bolt inserted into/fixed to the slope face and inserting a head part projecting from the slope face into a mesh of the net 2 and a nut 4 threadably attached to the head part of the reinforcement material 3. A support plate 6 is arranged between the slope face and the net 2. The reinforcement material 3 is inserted into a through-hole of the support plate 6. The support plate 6 has a plurality of upward projected projections 62 in a position separated from the through-hole around the through-hole. The plurality of projections 62 are inserted into the mesh of the net 2. The net 2 is pressed to an upper surface of the support plate 6 via tightening force of the nut 4 in an area enclosed by the plurality of projections 62.SELECTED DRAWING: Figure 3

Description

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

  For example, as a construction method for preventing surface layer collapse of a ground, a net is laid on a slope, reinforcements such as lock bolts are arranged at predetermined intervals on a slope on which the net is laid, and a bearing plate attached to the reinforcement There is a way to press the net from the top to the slope. As described above, the method using the net has the advantage of being able to cope with the large swell of the ground. However, it is difficult for the net to follow unevenness that is not large undulation, and the pressing force is likely to be insufficient. On the other hand, in Patent Document 1 below, the bag is placed in the recess of the slope, and the net is laid from above, and then the recess of the slope is expanded by filling the bag with cement milk. A method of filling is proposed. However, the construction is difficult because it is necessary to fill the bag with cement milk. Moreover, although it can respond to the comparatively large recessed part of a slope, it can not respond to fine unevenness.

  On the other hand, the net has a characteristic that it is easily displaced along the slope. Since the reinforcing material passes through the mesh of the net, although it is possible to prevent a large positional deviation of the net by this reinforcing material, it is not always sufficient. On the other hand, there is also a method of pressing a net from the upper side by a supporting plate in which a plurality of claws are provided on a lower surface as in Patent Document 2 below. The claws penetrate the mesh of the net and stick to the slope, thereby preventing displacement of the net along the slope together with the reinforcing material. However, if there is unevenness on the slope at the installation location of the bearing plate, there is a case where space is easily generated partially between the lower surface of the bearing plate and the slope, and the force that presses the net against the slope by the bearing plate is difficult to act on the net is there.

JP 2001-11863 A Patent No. 6132416 gazette

  Therefore, the present invention is made in view of the above-mentioned conventional problems, and provides a slope stabilization structure capable of firmly pressing the net on the slope and effectively preventing the displacement of the net along the slope. To be an issue.

  The present invention has been made to solve the above problems, and the slope stabilization structure according to the present invention comprises a net laid on a slope of soil and a head inserted and fixed to the slope and protruding from the slope. A support plate is provided between a slope and a net, and a reinforcing material such as a lock bolt or the like passing through the mesh of the net and a nut screwed to the head of the reinforcing material are disposed. A reinforcing material is inserted through the through hole of the plate, and the support plate is provided with a plurality of projections projecting upward around the through hole and away from the through hole, the plurality of projections being a net In the area surrounded by the plurality of projections, the net is pressed against the upper surface of the support plate via the tightening force of the nut.

  In the slope stabilization structure of this configuration, a support plate is interposed between the net and the slope, and the upper surface of the support plate serves as a support surface for supporting the net. Therefore, even if the slope is uneven, the net can be reliably supported from the lower side by the support plate. On the other hand, the support plate is provided with a plurality of projections projecting upward, and the projections penetrate the mesh of the net upward. Therefore, positional deviation along the slope of the net is prevented by the reinforcing material and the plurality of protrusions. Therefore, the area surrounded by the plurality of protrusions is an area in which the positional deviation of the net is prevented. Since the net in a state in which the positional deviation is prevented is pressed against the upper surface of the support plate by the tightening force of the nut, the net can be reliably sandwiched vertically, and the positional deviation of the net can be further prevented. . And, the tightening force of the nut acts on the slope through the net and the support plate. Since the net is in a state where positional deviation is prevented by the reinforcing material and the plurality of projections, and the network is pressed against the upper surface of the support plate, the supporting plate is The net can be pressed firmly to the slope through.

  In particular, the projections are integrally formed on the support plate, and the projections project upward to the outermost part of the upper surface of the support plate so that the support plate does not protrude outward locally at the formation points of the projections. It is preferable that it is provided. By integrally forming the projections on the support plate, the strength of the projections can be easily secured. In addition, if the support plate locally protrudes outward at the formation location of the protrusion, the wire of the net easily sinks in the lower side of the formation location of the protrusion, and the wire of the net is between the lower surface and the side of the support plate. Strong contact with the boundary of the wire, the wire rod of the net is easily broken. Therefore, it is preferable that the support plate does not locally protrude outward at the formation location of the projections, and the projections are provided to project upward at the outermost part of the upper surface of the support plate. The wire can be prevented from entering the lower side of the support plate, and the wire of the net is less likely to be broken.

  Furthermore, it is preferable that the support plate has a disk shape, and three or more protrusions are provided at equal intervals on the same circle centered on the through hole of the support plate. The net can be pressed firmly against the upper surface of the support plate in a circular area surrounded by three or more protrusions. In addition, positional deviation in each direction of the net can be prevented in a well-balanced manner by three or more protrusions arranged at equal intervals on the same circle.

  Furthermore, it is preferable that the projections have a shape that is long in the circumferential direction in a plan view and has a small dimension in the inward / outward direction, and both side surfaces in the circumferential direction are curved surfaces curved along the inward / outward direction. Since the net is often in contact with the side surface in the circumferential direction of the protrusion, if the protrusion has a shape that is long in the circumferential direction and has a small dimension in the inner and outer directions in plan view, the strength of the protrusion against the force received from the net can be easily secured. Further, by making both side surfaces in the circumferential direction of the protrusions curved in the inward and outward direction, breakage of the net can be prevented.

  In addition, a coil spring is provided between the nut and the net, and the coil spring is in a compressed state by tightening the nut, a reinforcing material is inserted inside the coil spring, and the plurality of projections of the support plate are coil springs. It is preferable to be located outside. In this case, the spring force of the coil spring acts on the net from above, and the net is pressed against the upper surface of the support plate by the coil spring and is vertically sandwiched by the coil spring and the support plate. Although the slope of the soil may sink after construction and the surface may run off and the height may be reduced, the pressing force of the net is likely to decrease, but the spring force of the coil spring acts, so the height of the slope is high It can follow the change in height. Therefore, the net can be pressed to the slope for a long time, and the slope can be stabilized for a long time. If the wire member of the coil spring is circular in cross section, even if the coil spring abuts on the net, cutting and scratching of the net by the coil spring can be prevented. In addition, although the reinforcing material is not inclined at right angles to the slope but inclined in many cases, even in such a case, the coil spring is reinforced by the head of the reinforcing material being inserted inside the coil spring. The net can be deformed according to the inclination of the material, and the net can be reliably pressed on the upper surface of the support plate.

  In particular, the lower end portion of the coil spring is preferably in contact with the portion of the wire of the net defining the mesh through which the protrusion is inserted. In this configuration, it is possible to apply a spring force to the wire of the net whose positional deviation is directly prevented by the projection. Further, the lower end portion of the coil spring can be positioned in the vicinity of the inner side of the protrusion, and the net can be pressed by the coil spring at the outermost part of the region surrounded by the plurality of protrusions.

  As described above, by interposing the support plate between the net and the slope, the support surface of the net can be secured, and by providing the plurality of projections on the support plate, the positional deviation of the net can be assured together with the reinforcing material. Can be prevented. By applying the tightening force of the nut to the net in the area surrounded by the plurality of projections and pressing the net against the support plate, the net can be reliably pressed against the slope via the support plate.

The top view which shows the construction example of the slope stabilization structure in one Embodiment of this invention. The top 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 containing the partial cross section which shows the principal part of the slope stabilization structure. It is a coil spring used for the slope stabilization structure, Comprising: (a) is a front view, (b) is a top view. It is a support plate used for the slope stabilization structure, Comprising: (a) is sectional drawing, (b) is a top view. It is a front view which shows the components used for the slope stabilization structure, Comprising: (a) is an auxiliary anchor pin, (b) is a coupling coil. It is a spacer used for the slope stabilization structure in other embodiment of this invention, Comprising: (a) is a front view, (b) is a top view. The front view which shows the reinforcing material used for the slope stabilization structure in the embodiment. The front view containing the partial cross section corresponding to FIG. 4 which shows the principal part of the slope stabilization structure. The top view corresponding to FIG. 3 which shows the principal part of the slope stabilization structure in other embodiment of this invention. The front view containing the partial cross section corresponding to FIG. 4 which shows the principal part of the slope stabilization structure in other embodiment of this invention. The front view containing the partial cross section corresponding to FIG. 4 which shows the principal part of the slope stabilization structure in other embodiment of this invention.

  Hereinafter, the slope stabilization structure according to the embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a plan view showing one construction example of the slope stabilization structure in the present embodiment, and in particular, it is suitable for suppressing the erosion and runoff of the soil on the surface layer of the slope 1 . That is, it is suitable for preventing the surface failure of the slope 1. The slope 1 may be a ground or an artificially formed shaped slope 1 (artificial slope). In particular, it is suitable for the natural slope 1 where plants and trees remain. The surface layer of the slope 1 is, in particular, 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 outflow of the surface soil.

  In the slope stabilization structure, a net 2 is laid on a slope 1, and a reinforcing material 3 (an anchor) such as a lock bolt is inserted and fixed at a predetermined place of a laying area of the net 2. In FIG. 1, only a part of the laying area of the net 2 is shown. The reinforcing members 3 are disposed, for example, at predetermined intervals in two directions orthogonal to each other. Specifically, the direction of the slope of slope 1 (inclination direction) is the vertical direction, and the direction perpendicular to the longitudinal direction is parallel to slope 1, and the direction parallel to slope 1 is the horizontal direction. Be placed. In addition, in FIG. 1, although the aspect of the staggered arrangement which arranged the reinforcing material 3 in a staggered form by shifting every row is illustrated, it may be an aspect of a square arrangement arranged in a grid or grid. . The distance between adjacent reinforcing members 3 is also arbitrarily set according to the situation at the site, but can be, for example, a distance of 2 m × 2 m.

  The detail of the principal part of the slope stabilization structure is shown in FIG. 3 and FIG. The slope stabilization structure in the present embodiment includes the above-mentioned net 2 and reinforcement 3, a nut 4 screwed to the head of the reinforcement 3, and a coil spring disposed between the nut 4 and the net 2. 5 and a support plate 6 interposed between the net 2 and the slope 1.

<Net 2>
The net 2 may be of various materials and shapes. In the present embodiment, the net 2 is made of a resin-made wire. By making the wire of the net 2 made of resin, corrosion due to rust etc. does not occur, and it is lightweight, is excellent in flexibility, has good followability to irregularities and waviness of the slope 1, and has good workability. It is. As the wire, for example, one having a thickness of 1 to 5 mm can be used, and in particular, one having a thickness of 2 to 4 mm is preferable. Preferably, synthetic fibers are used for the wire. In addition, it is preferable that the net 2 is a synthetic fiber knitted by Russell. In the case of russell knitting, the cross point of the net 2 is also formed by russell knitting. In this way, by using the Russell knit structure, the knit can not be further loosened even if it is cut at one place. The synthetic fiber is preferably made of weatherable polyester. Furthermore, it may be a wire in which a monofilament is additionally inserted in the Russell knit of a synthetic fiber. By using a monofilament, it is possible to improve the shape retention compared to the configuration of Russell knitting of only synthetic fibers, and the mesh of the net 2 is less likely to break down. Therefore, the nets 2 can be easily coupled by the coupling coil 7 as described later. The shape of the net of the net 2 may be, for example, a rhombus, or may be a hexagonal turtle-shaped net. Although the size of the pattern may be various, as an example, it is 25 mm or 50 mm in a rhombus. The net 2 may be made of resin or may be various metal mesh, or may be a wire coated with resin on the outside of the metal wire.

  In the present embodiment, the wire rod of the net 2 is a wire rod made of a weather resistant polyester fiber by Russell knitting and additionally inserted a monofilament made of a weather resistant polyester. As shown in FIG. 1, the net 2 has a width of, for example, about 2 m to 3 m. It lays down on the slope 1 while stretching the rolled net 2. A coupling coil 7 as shown in FIG. 7B is used to connect the nets 2 to each other. As also shown in FIG. 2, side edges of adjacent nets 2 are overlapped with a predetermined width (for example, 200 mm). The side edge of one net 2 is superimposed on the upper side of the side edge of the other net 2 with a predetermined width. One rope 8 for connection is installed at a predetermined position on the overlapping portion of the nets 2, for example, at the center in the width direction of the overlapping portion. A plurality of coupling coils 7 are set in advance in series in the rope 8. That is, the rope 8 is inserted through the coupling coil 7. The rope 8 on which the coupling coil 7 is mounted is placed on the overlapping portion. The rope 8 is installed to extend along the longitudinal direction of the overlapping portion. Then, while rotating the coupling coil 7 attached to the rope 8, the coupling coil 7 is hooked on both nets 2 from one end thereof. As a result, both side edges of the net 2 are connected by the coupling coil 7. The coupling coils 7 are arranged at intervals along the longitudinal direction of the overlapping portion. However, the connection structure of the nets 2 may be various, and may be simply connected by a rope without using the coupling coil 7.

<Reinforcement 3>
As described above, the reinforcing members 3 are scattered in the laying area of the net 2 at predetermined intervals. The reinforcing material 3 may be positioned at the overlapping portion of the nets 2. As shown in FIGS. 3 and 4, most of the reinforcing material 3 is embedded in the slope 1, and the upper predetermined length portion projects upward from the slope 1. In addition, in FIG. 4 etc., the slope 1 is shown in figure as horizontal state on account of description. The portion of the reinforcing material 3 in which the reinforcing material 3 protrudes from the slope 1 is a head, and the head passes through the mesh of the net 2. As the reinforcing member 3, a rod-like steel material is used, and specifically, a lock bolt, a deformed bar steel, a threaded joint bar steel, a self-piercing bolt or the like is used. Under an environment susceptible to corrosion, one coated with various resins such as epoxy resin, a continuous fiber-reinforced rod or the like may be used. When the surface layer of the slope 1 slips, the reinforcing material 3 resists and suppresses the sliding force of the surface layer of the slope 1. As in the present embodiment, in order to prevent the surface layer of the slope 1 from being broken or slipped, it is sufficient for the reinforcing material 3 to be inserted to the same depth as the surface layer of the slope 1, for example, 0.5 to 1. It is inserted to the depth of 5m. Accordingly, the length of the reinforcing material 3 is also set to a length corresponding to the surface layer.

  The injection material 11 is used to fix the reinforcing material 3. A drilled hole 10 is formed on the slope 1, the reinforcing material 3 is inserted into the drilled hole 10, and the injection material 11 is filled in the space between the drilled hole 10 and the reinforcing material 3. The reinforcing material 3 is fixed to the slope 1 by the injection material 11. The injection material 11 plays a role of load transfer 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 11.

  The length of the reinforcing material 3 and the depth of the drilling 10 depend on the depth for which it is desired to prevent collapse, but at least the length of the reinforcing material 3 is longer than the depth of the drilling 10 and the head of the reinforcing material 3 Is projected above the ground surface for a predetermined length. For example, for the purpose of suppressing only the erosion and runoff of soil on the surface layer of the slope 1, for example, the length of the reinforcing material 3 is set to, for example, 50 cm. On the other hand, for the purpose of preventing the phenomenon in which a mass of soil in a range surrounded by the adjacent reinforcing members 3 tries to get out of the reinforcing members 3 (hollow), the length of the reinforcing members 3 is set to 100 cm, for example. In any case, the head of the reinforcing material 3 is projected upward from the surface (ground surface) of the slope 1 by a predetermined length. For example, the overhanging length of the reinforcing member 3 which is the amount of protrusion protruding from the slope 1 is 5 cm to 20 cm, but this can attach the nut 4 or the coil spring 5 as the fixing tool to the head of the reinforcing member 3 The length required for The surface of the reinforcing member 3 is preferably galvanized, and preferably at least the head of the entire length. Although the reinforcing member 3 is basically inserted vertically to the inclined surface 1, it is not actually vertical but is often inserted in an inclined state.

<Coil spring 5 and nut 4>
A nut 4 and a coil spring 5 are attached to the head of the reinforcing member 3. The head of the reinforcing member 3 is inserted through the coil spring 5, and the coil spring 5 is located between the nut 4 and the net 2 and is in a compressed state. The wire of the coil spring 5 is circular in cross section. In the present embodiment, the coil spring 5 is not of a constant diameter from one end to the other end, but has a frusto-conical shape in which the diameter gradually increases from the upper side to the lower side as shown in FIG. It looks swirly. It is also called a conical spring. The upper end surface of the coil spring 5 has a relatively small diameter, and the lower end surface has a relatively large diameter. The coil spring 5 may be right-handed or left-handed, but is preferably right-handed, so the wire of the coil spring 5 gradually expands in diameter clockwise (clockwise) in plan view from the upper end to the lower end.

  The size of the lower end face of the coil spring 5 may be variously changed according to the size (size of mesh) of the net 2 but as shown in FIG. 3, it is at least larger than the size of the net 2 Ru. When the mesh shape is a rhombus, a total of eight meshes exist around the mesh of the net 2 through which the reinforcing material 3 is inserted, but the lower end surface of the coil spring 5 is larger than the mesh of the center thereof Preferably, it is sized to be located on all eight surrounding meshes. On the other hand, the size of the upper end face of the coil spring 5 can be changed variously depending on the size of the nut 4, but at least the lower end face of the nut 4 can press the upper end face of the coil spring 5 all around. The diameter of the lower end face of the coil spring 5 is preferably 2 to 5 times the diameter of the upper end face. As an example, the diameter of the upper end surface of the coil spring 5 is 30 mm, and the diameter of the lower end surface is 100 mm. The total length of the coil spring 5 is also arbitrary, but for example, the free length is larger than the diameter of the upper end surface of the coil spring 5 and smaller than the diameter of the lower end surface of the coil spring 5 Too short.

  The coil spring 5 is located on the upper side of the net 2, but in the present embodiment, the coil spring 5 and the net 2 are in a entangled connection state. That is, the lower end side of the wire rod of the coil spring 5 is hooked on the net 2, and thereby the coil spring 5 and the net 2 are connected. Specifically, the lower end side of the wire of the coil spring 5 passes under the wire of the net 2. There are various modes of hooking the wire of the coil spring 5 and the net 2, but for example, as shown in FIG. 3, the wire of the coil spring 5 is hooked so as to sew the wire of the net 2 up and down in the circumferential direction. Further, the length by which the lower end side of the wire of the coil spring 5 is entwined in the net 2 is optional, but at least the lower side of one side of the mesh of the net 2 may be inserted. It is preferable to insert two or more times, not only once. Then, it is preferable that one or more turns on the lower end side of the wire material of the coil spring 5 be entangled with the net 2, and it is preferable that one turn or more and two turns or less. If the coil spring 5 is right-handed, it can be inserted under the net 2 while rotating the coil spring 5 clockwise (clockwise) when viewed from the upper side, and the tightening direction of the nut 4 Since the winding direction of the coil spring 5 is the same as that of the coil spring 5, the frictional force and the rotational force act on the upper end surface of the coil spring 5 in the direction in which the amount of hooking on the net 2 increases. Become. Therefore, the tightening of the nut 4 may not loosen the hooking of the coil spring 5 to the net 2.

  The nut 4 is located on the upper side of such a 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 preferably has a seat. That is, the nut 4 integrally includes a hexagonal nut main portion 40 and a seat portion 41 located below the nut main portion 40 and larger in size and larger in diameter than the nut main portion 40. The structure is The seat portion 41 is larger in diameter than the upper end surface of the coil spring 5 and smaller in diameter than the lower end surface. However, the nut 4 may not be of the seat type, and a receiving seat may be interposed between the nut 4 and the coil spring 5.

<Support plate 6>
A support plate 6 is interposed between the net 2 and the slope 1. The support plate 6 is shown in FIG. A through hole 60 is formed in the central portion of the support plate 6, and the head of the reinforcing material 3 is inserted through the through hole 60. The through hole 60 is, for example, circular. The support plate 6 is larger in diameter than the coil spring 5 and larger than the lower end surface of the coil spring 5. The support plate 6 has a plate-like shape as a whole and has a projection 62 integrally formed on the upper surface thereof. The support plate 6 is preferably made of metal, and the protrusions 62 may be integrally formed by casting.

  Specifically, the support plate 6 is provided with a disk-shaped plate main portion 61 which is circular, and a plurality of protrusions 62 protruding from the peripheral edge portion of the upper surface of the plate main portion 61. The upper surface and the lower surface of the plate main portion 61 are flat surfaces, and are smooth surfaces except for the protrusions 62 and the through holes 60. Although the thickness of the plate main portion 61 is arbitrary, it is, for example, about several millimeters. The outer diameter of the plate main portion 61 is larger than the outer diameter of the lower end surface of the coil spring 5.

  The protrusions 62 are provided on the outermost periphery of the upper surface of the plate main portion 61. The projections 62 do not extend outside the outer edge of the plate main portion 61, and are located within the inside of the circular outer edge of the plate main portion 61. The base end of the outer side surface 62 a of the projection 62 is substantially flush with the side surface of the plate main portion 61, that is, the outer peripheral surface. The protrusions 62 are shaped so as to be long in the circumferential direction of the support plate 6 and smaller in the dimension in the inner and outer directions in plan view. The circumferential length of the protrusion 62 is longer than the dimension of the protrusion 62 in the inward and outward directions. The outer side surface 62 a and the inner side surface 62 b of the protrusion 62 are slightly curved outward in the circumferential direction. Accordingly, the outer side surface 62a of the protrusion 62 is a convex curved surface, and the inner side surface 62b is a concave curved surface. Further, both side surfaces 62c in the circumferential direction of the protrusion 62 are curved surfaces that are convexly curved along the inner and outer direction. Further, the dimension in the circumferential direction of the protrusion 62 and the dimension in the inward and outward directions gradually decrease upward as the protrusion 62 gradually narrows from the proximal end to the distal end.

  The extent to which the dimension in the circumferential direction of the protrusion 62 gradually decreases from the proximal end to the tip of the protrusion 62, the dimension in the in-out direction of the protrusion 62 gradually decreases from the proximal end to the tip of the protrusion 62 It is bigger than it becomes. The projection length of the projection 62 is also optional, but is larger than the thickness of the plate main portion 61, at least the thickness of the net 2, ie, the thickness of the wire of the net 2, and is several times the thickness of the net 2. . The height of the projection 62 is preferably at least half the height of the coil spring 5 in the compressed state. It is preferable that the dimension in the inward / outward direction of the protrusion 62 at the proximal end portion of the protrusion 62 is substantially the same as the thickness of the plate main portion 61.

  The protrusions 62 are formed at regular intervals in the circumferential direction. The projections 62 are provided on the same circle centered on the through hole 60, and therefore, the projections 62 are disposed at regular angles. In the present embodiment, a total of six projections 62 are formed every 60 degrees. The coil spring 5 is located inside the plurality of protrusions 62. Therefore, the outer diameter of the lower end surface of the coil spring 5 is smaller than the diameter of the virtual circle 63 virtually formed by the inner side surfaces 62 b of the plurality of protrusions 62. However, the wire which is the lowermost part of the coil spring 5 and which constitutes the outermost periphery may be in a position close to the inside of the protrusion 62 and may be in contact with each other. As shown in FIG. 3, the projections 62 respectively pass through the mesh of the net 2. Each protrusion 62 passes through a different mesh. The lower end portion of the coil spring 5 is in contact with the portion of the wire of the net 2 defining the mesh through which the protrusion 62 is inserted. When the mesh of the net 2 is a rhombus, the wire of the net 2 defining the rhombus is formed of four sides, but the lower end portion of the coil spring 5 is in contact with any of the wires of the four sides.

<Construction procedure>
The outline of the construction procedure of the slope stabilization structure is explained. First, the holes 10 are formed on the slope 1 at predetermined intervals. The depth of the drilled hole 10 is made smaller by a predetermined amount than the length of the reinforcing material 3 used. Then, after filling the injection material 11 into the hole 10, the reinforcing material 3 is inserted, or alternatively, the reinforcement material 3 is inserted into the hole 10 first, and then the injection material 11 is filled. In any case, the reinforcing material 3 is integrated with the slope 1 by the injection material 11. Further, the head portion of the reinforcing material 3 is in a state of being protruded from the slope 1 having a predetermined length. Next, the support plate 6 is placed on the slope 1 at the installation place of the reinforcing material 3. Since the through holes 60 are formed in the support plate 6, the support plate 6 is placed on the slope 1 so that the reinforcing material 3 is inserted into the through holes 60. Thereafter, the 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. The head portion of the reinforcing material 3 is inserted into the mesh of the net 2, and the projections 62 of the support plate 6 are inserted into the mesh of the net 2.

  Then, the 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 under the net 2 Tangled in 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 make the net 2 the upper surface of the support plate 6 Press on When the nut 4 is screwed to the reinforcing member 3, an antirust agent such as grease is applied to the head of the reinforcing member 3, or an antirust agent is applied to the inner circumferential surface of the nut 4. You may Moreover, it is preferable to make it the state which the head of the reinforcing material 3 protrudes upwards from the nut 4. By tightening the nut 4, the coil spring 5 is compressed, and the spring force acts on the upper surface of the support plate 6 through the net 2. The supporting plate 6 placed on the slope 1 may be slightly sunk from the surface of the slope 1 by this force. Preferably, the auxiliary anchor pin 12 as shown in FIG. 7 (a) is inserted into the slope 1 at an appropriate position so as to press the net 2 against the slope 1 in an auxiliary manner. The upper portion 12a of the auxiliary anchor pin 12 is bent approximately 90 degrees to the side, and the bent upper portion 12a presses the net 2 from the upper side toward the slope 1.

  In the slope stabilization structure as described above, since the support plate 6 is interposed between the net 2 and the slope 1, the upper surface of the support plate 6 can be used as the support surface of the net 2. That is, by interposing the support plate 6 on the lower side of the net 2, a smooth support surface for supporting the net 2 from the lower side can be secured. Therefore, even if the slope 1 is uneven, the net 2 can be reliably supported from the lower side by the upper surface of the support plate 6. Then, the net 2 can be securely held vertically by the lower support plate 6 and the upper coil spring 5.

  On the other hand, since the plurality of projections 62 are provided on the support plate 6, the projections 62 can prevent the positional deviation of the net 2 along the slope 1. That is, the positional deviation along the slope 1 of the net 2 and the deformation of the net 2 can be reliably prevented by the reinforcing member 3 and the plurality of protrusions 62 around the reinforcing member 3. As described above, since the plurality of protrusions 62 are disposed around the reinforcing material 3 and at a position separated from the reinforcing material 3 by a predetermined distance radially outward from the reinforcing material 3 so as to go around the reinforcing material 3, they are surrounded by the plurality of protrusions 62. The rounded circular area is an area in which the displacement of the net 2 is prevented. Since the net 2 is pressed against the upper surface of the support plate 6 by the coil spring 5 in that region, the net 2 which is not displaced or deformed can be reliably sandwiched vertically by the coil spring 5 and the support plate 6. The tightening force of the nut 4 acts as a spring force on the net 2, and the spring force acts on the slope 1 via the net 2 and the support plate 6. Since the net 2 is in a state in which positional deviation is prevented by the reinforcing member 3 and the plurality of protrusions 62 and is pressed against the upper surface of the support plate 6, the slope 1 has unevenness at the installation location of the reinforcing member 3. Even in this case, the net 2 can be reliably pressed to the slope 1 through the support plate 6.

  Further, since the net 2 tends to be displaced or deformed along the slope 1, a large force is applied to the protrusions 62 from the net 2, but the protrusions 62 are integrally formed on the support plate 6 As a result, the strength of the protrusions 62 can be easily secured. Further, since the projections 62 are provided on the outermost periphery of the upper surface of the support plate 6 and the projections 62 do not protrude outward from the outer edge of the plate main portion 61, the wire of the net 2 is on the lower side of the support plate 6. The wire of the net 2 is hard to break.

  Further, since a total of six projections 62 are formed at equal intervals on the same circle around the through hole 60 of the support plate 6, the net 2 is supported in a circular area surrounded by the six projections 62. It can be pressed firmly against the upper surface of the plate 6. Further, since the six projections 62 are arranged at equal intervals on the same circle, it is possible to prevent the positional deviation of the net 2 in each direction with good balance, and the load of each projection 62 is also equalized. Furthermore, at least one mesh is present between the mesh through which the reinforcing material 3 is inserted and the mesh through which the protrusion 62 is inserted. That is, since the projections 62 are inserted through the mesh separated from the mesh through which the reinforcing material 3 is inserted, instead of the projections 62 being inserted through the mesh adjacent to the mesh through which the reinforcing material 3 is inserted, By the reinforcing member 3 and the projection 62, the positional deviation and the deformation of the net 2 can be efficiently prevented.

  In addition, although the net 2 is often in contact with the side surface 62c in the circumferential direction of the projection 62, the projection 62 has a shape that is long in the circumferential direction and small in inner and outer dimensions in plan view. Can prevent the protrusion 62 from being damaged. Further, since both side surfaces 62c in the circumferential direction of the projection 62 are curved in the inward and outward directions, breakage of the net 2 can be prevented.

  Further, since the coil spring 5 in a compressed state is provided between the nut 4 and the net 2, even if the slope 1 sinks after construction or the surface flows out, such height reduction of the slope 1 is easy. And the net 2 can be stably pressed on the slope 1 over a long period of time. The compression state of the coil spring 5 can be easily recovered by tightening the nut 4 after installation. Since the wire of the coil spring 5 is circular in cross section, even if the coil spring 5 is in contact with the net 2 and the lower end side of the wire of the coil spring 5 is hooked on the net 2, the net 2 is not easily damaged. Even if the reinforcing member 3 is not vertical but inclined with respect to the slope 1, the head of the reinforcing member 3 is inserted through the inside of the coil spring 5, so the coil spring 5 deforms according to the inclination of the reinforcing member 3. It is possible to securely press the net 2 against the upper surface of the support plate 6.

  In addition, since the coil spring 5 has a truncated cone shape, the nut 4 can be small, and the unit cost of the member can be suppressed and the tightening operation of the nut 4 can be facilitated. In addition, even if the receiving seat is not interposed between the nut 4 and the coil spring 5, the upper end surface of the coil spring 5 can be directly pressed by the nut 4 with the small nut 4. Furthermore, since the lower end surface of the coil spring 5 has a large diameter, a large area of the net 2 can be held down by the lower end surface of the coil spring 5 and the spring force is efficiently applied to the net 2 to make the net 2 a support plate It can be pressed on the top surface. Furthermore, since the lower end portion of the coil spring 5 is in contact with the portion of the wire of the net 2 defining the mesh through which the protrusion 62 is inserted, a spring force is applied to the wire of the net 2 near the inside of the protrusion 62 The net 2 can be effectively pressed onto the upper surface of the support plate 6 by direct application.

  Moreover, since the lower end side of the wire material of the coil spring 5 is hooked on the net 2, the positional deviation of the net 2 can be prevented more effectively. In particular, since the lower end side of the coil spring 5 is hooked on the portion of the wire of the net 2 defining the mesh through which the protrusion 62 is inserted, positional deviation of the net 2 is effected by the cooperation of the protrusion 62 and the coil spring 5 Can be prevented. As described above, in the configuration in which the lower end side of the coil spring 5 is hooked to the net 2, the lower end side of the coil spring 5 is likely to be linearly extended when the net 2 is displaced, but the projection 62 prevents the net 2 from being displaced. Therefore, the extension phenomenon of the lower end side of the coil spring 5 is prevented. In particular, since the coil spring 5 is hooked on the net 2 in the vicinity of the projection 62, the extension phenomenon of the coil spring 5 can be efficiently prevented. Further, since the projection 62 is located around the coil spring 5, the projection 62 also functions as a protective wall of the coil spring 5.

  In order to prevent the reinforcing member 3 from being eccentric with respect to the center of the hole 10, the spacer 13 as shown in FIG. A state in which the spacer 13 is attached to the reinforcing material 3 is shown in FIG. For example, two spacers 13 are attached to the reinforcing member 3 at intervals. As shown in FIG. 9, the spacer 13 is attached to the reinforcing member 3 in advance, and the reinforcing member 3 is inserted into the hole 10, whereby the reinforcing member 3 is easily positioned at the center of the hole 10 as shown in FIG. It can be done.

  Further, although the coil spring 5 is hooked to the net 2 in the above embodiment, the coil spring 5 may simply be placed on the net 2 without entwining the coil spring 5 on the net 2 as shown in FIG.

  Further, although the case of using the frustoconical coil spring 5 has been described, as shown in FIG. 12, a cylindrical coil spring 5 having a constant diameter may be used. In this case, when the receiving seat 14 is interposed between the coil spring 5 and the nut 4, the nut 4 smaller than the coil spring 5 can be used. Furthermore, as shown in FIG. 13, a configuration may be employed in which no spring such as a coil spring 5 is interposed between the net 2 and the nut 4. As described above, in the configuration in which the spring is not used, the tightening force of the nut 4 is directly converted to the net 2 without being converted into the spring force. In this case, when the receiving seat 14 is interposed between the nut 4 and the net 2, the small-sized nut 4 can be used, and the net 2 in the vicinity of the inner side of the projection 62 can be used as the support plate It can be pressed on the top surface. When the seat 14 is used, the nut 4 may be configured without the seat 41.

  Although the protrusions 62 are integrally formed on the support plate 6 in the above embodiment, the protrusions 62 may be separate from the support plate 6. That is, the projection 62 may be configured as a separate member from the support plate 6 and assembled to the support plate 6. The shape of the support plate 6 can also be changed as appropriate, and may be elliptical, oval, or track-shaped, or may be polygonal such as rectangular or hexagonal.

DESCRIPTION OF SYMBOLS 1 slope 2 net 3 reinforcement 4 nut 5 coil spring 6 support plate 7 coupling coil 8 rope 10 drilling hole 11 injection material 12 auxiliary anchor pin 12 a upper portion 13 spacer 14 seat 40 nut main portion 41 seat portion 60 through hole 61 plate main portion 62 projection 62a outer side surface 62b inner side surface 62c circumferential side surface 63 virtual circle

Claims (6)

A net laid on a slope of soil, a head inserted and fixed to the slope, and a head projecting from the slope being screwed to a reinforcing member such as a lock bolt passing through a mesh of the net and the head of the reinforcing member Equipped with a nut
A support plate is disposed between the slope and the net, and a reinforcing material is inserted through the through hole of the support plate,
The support plate is provided with a plurality of projections projecting upward around the through hole and away from the through hole, and the plurality of projections pass through the mesh of the net,
A slope stabilization structure characterized in that in a region surrounded by the plurality of projections, a net is pressed against the upper surface of a support plate via a tightening force of a nut.   The projections are integrally formed on the support plate, and the projections are projected upward on the outermost part of the upper surface of the support plate so that the support plate does not project outward locally at the formation points of the projections. The slope stabilization structure according to claim 1.   3. The slope stabilization structure according to claim 2, wherein the support plate has a disk shape, and three or more protrusions are provided at equal intervals on the same circle centered on the through hole of the support plate.   The slope stabilization structure according to claim 3, wherein the projections have a shape which is long in the circumferential direction in plan view and has a small dimension in the inward / outward direction, and both side surfaces in the circumferential direction are curved surfaces curved along the inward / outward direction.   A coil spring is provided between the nut and the net, and the coil spring is compressed by tightening the nut, the reinforcement is inserted inside the coil spring, and the plurality of projections of the support plate is on the outside of the coil spring. The slope stabilization structure according to any one of claims 1 to 4, which is located.   The slope stabilization structure according to claim 5, wherein a lower end portion of the coil spring is in contact with a portion of a wire of a net defining a mesh through which the protrusion is inserted.

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