Slope stabilization structure

Abstract

To provide a slope stabilizing structure capable of stably pressing down a slope even after construction.SOLUTION: A reinforcing material 1 having a male screw portion 10 and driven into a slope, a fixing nut 8 screwed to a head portion of the reinforcing material 1 protruding from the slope, a bearing member disposed between the slope and the fixing nut 8 and pressed toward the slope by the fixing nut 8, and a regulating member 9 regulating rotation of the fixing nut 8 with respect to the reinforcing material 1 are provided. An engaging groove 35 is provided along the axial direction on the inner peripheral surface of the fixing nut 8, and the rotation of the fixing nut 8 to the reinforcing material 1 is regulated by interposing a regulating member 9 between the screw defective part 11 of the reinforcing material 1 and the engaging groove 35 of the fixing nut 8.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a structure for stabilizing slopes. [Background technology]

[0002] For example, in the construction method described in Patent Document 1 below, a wire mesh is laid on a slope, and pressure plates are placed scattered on the wire mesh. Then, female threaded members are screwed onto the heads of anchors, and the female threaded members are tightened to press the pressure plates against the wire mesh.

[0003] However, after installation, there is a risk that the female screw member will gradually loosen due to vibration or the like, and the force pressing against the inclined surface may become insufficient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-11863 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a slope stabilization structure that can stably hold down a slope even after construction. [Means for solving the problem]

[0006] The slope stabilization structure of the present invention comprises a reinforcing material having a male threaded portion and to be driven into the slope; an anchoring nut screwed onto the head of the reinforcing material protruding from the slope; a support member arranged between the slope and the anchoring nut and pressed toward the slope by the anchoring nut; and a regulating member for regulating rotation of the anchoring nut relative to the reinforcing material, wherein a thread-missing portion in which a portion of the entire circumference of the male threaded portion is missing is provided along the axial direction on the outer surface of the head of the reinforcing material, and an engagement groove is provided along the axial direction on the inner surface of the anchoring nut, and the regulating member is interposed between the thread-missing portion of the reinforcing material and the engagement groove of the anchoring nut, thereby regulating rotation of the anchoring nut relative to the reinforcing material.

[0007] According to this configuration, when the fixing nut attempts to rotate in the loosening direction, the restricting member abuts against the thread-missing portion, preventing the fixing nut from rotating in the loosening direction.

[0008] In particular, it is preferable that the restricting member engages with the engagement groove and protrudes radially inward from the engagement groove by a predetermined amount. With this configuration, since the restricting member engages with the engagement groove, loosening of the fixing nut can be reliably prevented.

[0009] Furthermore, it is preferable that the amount of engagement of the restricting member with the engagement groove be greater than the amount of protrusion of the restricting member from the engagement groove. With this configuration, the restricting member is firmly and securely engaged with the engagement groove. As a result, when the fixing nut tries to rotate in the direction that would loosen it, the restricting member is even less likely to wobble, and loosening of the fixing nut can be reliably prevented.

[0010] Preferably, the anchoring nut has an upper end opening, and the restricting member is inserted axially from the upper end opening of the anchoring nut between the thread-missing portion and the engagement groove. With this configuration, the restricting member can be inserted from above the anchoring nut, resulting in good workability.

[0011] In particular, it is preferable that the restricting member be removably inserted between the thread-missing portion and the engagement groove from the upper end opening of the fixing nut. With this configuration, since the restricting member is removably inserted, even if it becomes necessary to remove the restricting member after installation, for example, the work can be easily performed.

[0012] Furthermore, it is preferable that the restricting member has a restricting shaft portion extending along the axial direction of the reinforcing material, and that the restricting shaft portion be inserted between the thread-missing portion and the engagement groove. With this configuration, since the restricting member has a restricting shaft portion extending along the axial direction of the reinforcing material, the restricting shaft portion can continuously restrict a predetermined length range of the reinforcing material in the axial direction.

[0013] Furthermore, it is preferable that the restricting member has an operating part provided at the upper end of the restricting shaft part and arranged so as not to enter between the thread-missing part and the engagement groove. With this configuration, by operating the operating part, the restricting shaft part can be easily inserted between the thread-missing part and the engagement groove.

[0014] Furthermore, it is preferable that the operating portion abuts against the upper end surface of the reinforcing material or the upper end surface of the fixing nut to stop the axial movement of the restricting member. With this configuration, the restricting shaft portion can be inserted between the thread-missing portion and the engagement groove until the operating portion abuts against the upper end surface of the reinforcing material or the upper end surface of the fixing nut. This facilitates the installation of the restricting member. Furthermore, even if it becomes necessary to remove the restricting member after installation, the restricting member can be easily pulled out by grasping the operating portion abutting against the upper end surface of the reinforcing material or the upper end surface of the fixing nut.

[0015] Furthermore, it is preferable that the operating portion is curved relative to the regulating shaft portion. With this configuration, the operating portion can be easily formed, and the regulating member can be manufactured at low cost. [Effects of the Invention]

[0016] As described above, the regulating member regulates the rotation of the fixing nut, preventing the fixing nut from loosening after installation, and maintaining a stable pressing force on the support member by the fixing nut for a long period of time. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view showing a main part of a slope stabilization structure according to an embodiment of the present invention. [Figure 2] Enlarged view of the main part of Figure 1. [Figure 3] FIG. [Figure 4] (a) is a cross-sectional view taken along the line AA in Figure 3, and (b) is an enlarged view of the main part of (a). [Figure 5] (a) is a cross-sectional view of the same structure of the fixing nut, taken along line AA, and (b) is an enlarged view of the main part of (a). [Figure 6] FIG. [Figure 7] 4A and 4B are front views showing a restricting member used in the structure. [Figure 8] FIG. 10 is an enlarged cross-sectional view of a main part showing the construction procedure of the same structure. [Figure 9] FIG. 10 is an enlarged cross-sectional view of a main part showing the construction procedure of the same structure. [Figure 10] A cross-sectional view corresponding to line AA showing the construction procedure and the state of use of the same structure. [Figure 11] FIG. 10 is a cross-sectional view showing a main part of a slope stabilization structure according to another embodiment of the present invention. [Figure 12] 10(a) and 10(b) are cross-sectional views showing the main parts of a slope stabilization structure according to another embodiment of the present invention. [Figure 13] FIG. 10 is a cross-sectional view showing a main part of a slope stabilization structure according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] A slope stabilization structure according to one embodiment of the present invention will be described below with reference to Figs. 1 to 10. Fig. 1 shows a cross-sectional view of the main part of the slope stabilization structure according to this embodiment. Note that Fig. 1 shows a natural ground slope 2 as if it were horizontal. The slope stabilization structure is based on rock bolt construction. Drilled holes 3 are formed in the slope 2, and reinforcing materials 1 such as rock bolts are inserted into the drilled holes 3. The reinforcing materials 1 are fixed to the slope 2 by injection material 4, and fixing devices 5 are attached to the heads of the reinforcing materials 1. Note that the axial direction is the axial direction of the reinforcing materials 1, and the radial direction is the radial direction of the reinforcing materials 1.

[0019] In this embodiment, the slope 2 is a natural slope, but it may be of various types. An example in which the slope 2 is a natural slope will be described. A net 6 is laid on the surface of the slope 2 as a surface work. The mesh shape of the net 6 is arbitrary, and may be circular or polygonal, such as a diamond or hexagon. For example, the net 6 is composed of a large number of ring units. The ring units are ring-shaped, for example, square. The net 6 is formed by combining a large number of ring units without being fixed to each other. However, the net 6 may also be formed by stretching wire ropes in two directions, for example, vertically and horizontally. In this way, the configuration of the net 6 may be various. The material of the net 6 may also be various, and it may be made of metal or resin.

[0020] Reinforcement materials 1 are cast at predetermined locations among the intersections of the net 6. The reinforcement materials 1 are aligned at intervals both horizontally and vertically along the slope. They are arranged in a staggered or grid pattern. Steel rods are typically used for reinforcement materials 1, specifically rock bolts, deformed steel bars, threaded steel bars, and self-drilling bolts. In corrosive environments, steel materials coated with various resins, such as epoxy resin, or continuous fiber reinforcement rods are also used. As the ground deforms, a tensile force is passively generated in the reinforcement materials 1. This tensile force of the reinforcement materials 1 resists the sliding force of the surface soil mass on the slope 2, suppressing deformation and sliding of the ground. Therefore, the drilled holes 3 are formed deeper than the expected slide surface. The reinforcement materials 1 are also inserted so that they reach the settlement layer of the ground deeper than the slide surface and are integrated into the ground with the injection material 4. The total length of the reinforcement 1 is determined by comprehensively considering the scale of collapse of the slope 2, the required deterrent force, ease of construction, economic efficiency, etc., but is usually several meters, and at least 2 meters. The head of the reinforcement 1 protrudes a predetermined distance above the slope 2. The protruding length of the reinforcement 1 is the amount of protrusion from the slope 2. The protruding length of the reinforcement 1 is set to a length necessary and sufficient for the slope 2 and the reinforcement 1 to be structurally integrated by the fixing device 5. It is preferable to apply zinc plating to the surface of the reinforcement 1, and it is preferable to apply zinc plating to at least the head of the entire length. Furthermore, although the reinforcement 1 is basically inserted perpendicular to the slope 2, it does not necessarily have to be perpendicular.

[0021] A male thread portion 10 is formed on the outer peripheral surface of the reinforcing material 1. As shown in Figures 2 and 6, a thread-missing portion 11, where the male thread portion 10 is partially missing, is provided at a predetermined location on the entire circumference of the male thread portion 10. The thread-missing portion 11 is formed along the axial direction of the reinforcing material 1. The male thread portion 10 and the thread-missing portion 11 are formed at least on the head of the reinforcing material 1, but are preferably formed over the entire length of the reinforcing material 1. The thread-missing portion 11 may be formed at only one location on the entire circumference, but in this embodiment, it is formed at two locations 180 degrees apart. Note that Figures 1 and 2 are cross-sectional views seen from the side of the thread-missing portion 11, and Figure 3 is a cross-sectional view seen from a direction perpendicular to the thread-missing portion 11.

[0022] The pair of thread-missing portions 11 are symmetrical to each other. The two-dot chain line in FIG. 6 shows a state where no thread is missing. The outer peripheral surface of the male thread portion 10 is locally cut radially inward at the thread-missing portion 11, specifically a D-cut. Therefore, the thread-missing portion 11 is flat. The thread-missing portion 11 is located radially inward compared to the other portions of the male thread portion 10. The minimum radius of the thread-missing portion 11 is the radius of the circumferential center of the thread-missing portion 11. The radius of the thread-missing portion 11 increases from the circumferential center toward both sides in the circumferential direction, is maximum at both circumferential ends, and is equal to the radius of the outer peripheral surface of the male thread portion 10. The radius of the outer peripheral surface of the male thread portion 10 is the radius of the crest portion 10a of the male thread portion 10. The minimum radius of the thread-missing portion 11, i.e., the radius at the circumferential center, is equal to or smaller than the radius of the valley portion 10b of the male thread portion 10.

[0023] The injection material 4 plays the role of transmitting load between the ground and the reinforcement material 1, and also the role of protecting the reinforcement material 1. The injection material 4 is filled between the wall surface of the drilled hole 3 and the reinforcement material 1, and is filled over the entire length of the drilled hole 3. Cement milk or mortar is used as the injection material 4, but cement milk is typically used.

[0024] A fixing device 5 is attached to the head of the reinforcing material 1 to securely and integrally fix the reinforcing material 1 to the slope 2. The fixing device 5 may have various configurations, but is particularly suitable for when a net 6 is stretched as a surface work. Specifically, the fixing device 5 comprises a bearing plate 7, which is a bearing member, and a fixing nut 8. The head of the reinforcing material 1 is inserted through the center of the bearing plate 7. The bearing plate 7 and the reinforcing material 1 are arranged coaxially. The fixing nut 8 is screwed onto the head of the reinforcing material 1 that has penetrated the bearing plate 7.

[0025] In this embodiment, the support plate 7 is made up of an upper support plate 20 and a lower support plate 21. The net 6 is sandwiched between the upper support plate 20 and the lower support plate 21. The net 6 may not be completely fixed by the upper support plate 20 and the lower support plate 21, and may be sandwiched between the upper support plate 20 and the lower support plate 21 to such an extent that the net 6 can move to some extent along the surface of the ground.

[0026] The lower support plate 21 is thin plate-shaped. The upper support plate 20 is formed thicker than the lower support plate 21. The lower support plate 21 is larger than the upper support plate 20, and if circular, has a larger diameter. The lower surface of the upper support plate 20 has downward protrusions 20a protruding from multiple locations, specifically three locations. The downward protrusions 20a abut against the upper surface of the lower support plate 21. These downward protrusions 20a form and maintain a predetermined gap between the upper support plate 20 and the lower support plate 21. The net 6 is positioned in this gap.

[0027] The fixing nut 8 presses the support plate 7 against the slope 2. While the reinforcing material 1 is generally inserted perpendicular to the slope 2, in reality, it is often not perpendicular. As a result, the angle between the reinforcing material 1 and the support plate 7 may not be a right angle. To ensure that the fixing nut 8 can be sufficiently tightened even in such cases, the pressing surface 30 of the fixing nut 8 that presses the support plate 7 (the upper support plate 20 in this embodiment) is spherical (curved). Furthermore, the pressure-receiving surface 20b formed on the inner peripheral surface of the upper support plate 20 that is pressed by the pressing surface 30 of the fixing nut 8 may be an inclined surface that widens in diameter toward the top, or a curved surface such as a spherical surface that is concavely curved toward the bottom.

[0028] The fixing nut 8 is cylindrical with both the top and bottom ends open. The fixing nut 8 may have various shapes and configurations, but in this embodiment, it is configured to integrally include a nut portion 31, a pressing portion 32, and a sheath portion 33. The nut portion 31 is provided on the upper part of the fixing nut 8. The nut portion 31 has a hexagonal shape in cross section. The pressing portion 32 extends below the nut portion 31. A pressing surface 30 is provided on the peripheral side of the pressing portion 32. The pressing surface 30 is spherical. The sheath portion 33 extends below the pressing portion 32. The sheath portion 33 is cylindrical.

[0029] By engaging a tool with the nut portion 31, the fixing nut 8 can be rotated and screwed onto the head of the reinforcement material 1, and the support plate 7 can be pressed downward via the pressing portion 32. Furthermore, by extending the sheath portion 33 below the pressing portion 32, the portion of the reinforcement material 1 near the surface of the slope 2 can be protected by the sheath portion 33. Therefore, the sheath portion 33 can prevent corrosion of the reinforcement material 1. Furthermore, since the sheath portion 33 is interposed between the net 6 and the reinforcement material 1, the net 6 and the reinforcement material 1 do not come into direct contact with each other. This construction method in which the net 6 is stretched across the entire structure is characterized by the transmission of force from the reinforcement material 1 to the net 6. However, since the sheath portion 33 is interposed between the net 6 and the reinforcement material 1, it is possible to prevent the reinforcement material 1 from rubbing against the net 6, damaging its surface and causing corrosion of the reinforcement material 1.

[0030] The inner peripheral surface of the anchoring nut 8 is formed with a female thread portion 34 that screws onto the male thread portion 10 of the reinforcing material 1. As shown in FIG. 4 , an engagement groove 35 is formed on the inner peripheral surface of the anchoring nut 8. The engagement groove 35 extends along the axial direction. The engagement groove 35 extends to the upper end opening of the anchoring nut 8. Preferably, the engagement groove 35 is formed over the entire axial length of the female thread portion 34. While the engagement groove 35 may be formed in only one location on the entire circumference of the inner peripheral surface of the anchoring nut 8, in this embodiment, it is formed in two locations 180 degrees apart. The two engagement grooves 35 have the same shape. The engagement groove 35 is formed by cutting out the threads of the female thread portion 34 in the axial direction. The depth D of the engagement groove 35 may vary, but in this embodiment, it is shallower than the height of the crest portion 34a of the female thread portion 34. Therefore, the engagement groove 35 does not reach the valley portion 34b of the female thread portion 34. The cross-sectional shape of the engagement groove 35 may also vary. The cross-sectional shape of the engagement groove 35 is the cross-sectional shape when the fixing nut 8 is cut in the radial direction so as to intersect with the engagement groove 35. In this embodiment, the cross-sectional shape of the engagement groove 35 is rectangular, and more specifically, square or rectangular. The width W of the engagement groove 35 is the dimension of the engagement groove 35 in the circumferential direction. The width W of the engagement groove 35 is greater than the depth D of the engagement groove 35.

[0031] A cap 36 is removably attached to the upper end of the fixing nut 8. The cap 36 is cylindrical with a closed top end and an open bottom end. The cap 36 closes the upper opening of the fixing nut 8. A male cap thread 37 is formed on the outer circumferential surface of the upper end of the fixing nut 8, and the cap 36 is removably screwed onto this male cap thread 37. The cap 36 may be omitted.

[0032] The slope stabilization structure includes a restricting member 9 that restricts rotation of the fixing nut 8 relative to the reinforcing material 1. The restricting member 9 is interposed between the thread-missing portion 11 of the reinforcing material 1 and the engagement groove 35 of the fixing nut 8, thereby restricting rotation of the fixing nut 8 relative to the reinforcing material 1. The restricting member 9 is inserted from the upper end opening of the fixing nut 8 between the thread-missing portion 11 and the engagement groove 35 so as to be detachable in the axial direction. The restricting member 9 in this embodiment is a rod-shaped restricting pin that extends in the axial direction.

[0033] FIG. 7(a) shows the regulating member 9. The regulating member 9 has a regulating shaft portion 40 extending along the axial direction of the reinforcing material 1 and an operating portion 41 provided at the upper end of the regulating shaft portion 40. The regulating shaft portion 40 is inserted between the engagement groove 35 and the thread-missing portion 11 to regulate rotation of the fixing nut 8. The regulating shaft portion 40 extends linearly in the vertical direction. The regulating shaft portion 40 is a square bar. The cross-sectional shape of the regulating shaft portion 40 is constant along the axial direction (vertical direction) and, in this embodiment, is rectangular, specifically, square. Therefore, the regulating shaft portion 40 engaged with the engagement groove 35 cannot rotate around the axis of the regulating shaft portion 40 relative to the engagement groove 35, and the regulating member 9 does not rotate around the regulating shaft portion 40 in a planar view. In other words, the orientation of the regulating member 9 in a planar view is fixed.

[0034] The operating portion 41 stops the axial movement of the regulating member 9. The operating portion 41 is bent relative to the regulating shaft portion 40. The operating portion 41 is bent at a right angle from the upper end of the regulating shaft portion 40. The operating portion 41 is integral with the regulating shaft portion 40 and extends at a right angle from the upper end of the regulating shaft portion 40. The operating portion 41 extends linearly in the horizontal direction, extending from the regulating shaft portion 40 toward the center of the upper end surface 1a of the reinforcing material 1. The cross-sectional shape of the operating portion 41 is the same as the cross-sectional shape of the regulating shaft portion 40, which is rectangular, more specifically, square. Therefore, the operating portion 41 can be easily formed. Note that, as described above, the regulating shaft portion 40 cannot rotate with respect to the engagement groove 35, and therefore the orientation of the operating portion 41 in a plan view is constant when the regulating shaft portion 40 is engaged with the engagement groove 35.

[0035] The operating portion 41 is provided with an upper protrusion 42. The upper protrusion 42 protrudes upward from the tip of the operating portion 41. The upper protrusion 42 is bent upward at a right angle from the tip of the operating portion 41, but may also face diagonally upward. The upper protrusion 42 is integral with the operating portion 41 and has a square cross section. Therefore, the upper protrusion 42 can be easily formed.

[0036] 3, the lower surface of the operating portion 41 abuts against the upper end surface 1a of the reinforcing material 1. When the operating portion 41 abuts against the upper end surface 1a of the reinforcing material 1, the restricting shaft portion 40 is prevented from moving further downward, and is prevented from entering the engagement groove 35. Furthermore, because the upper protrusion 42 protrudes upward from the upper end surface 1a of the reinforcing material 1, the restricting member 9 can be easily pulled out upward by grasping the upper protrusion 42 with a tool or by hand.

[0037] As shown in FIG. 3 , this embodiment uses a single regulating member 9. However, multiple regulating members 9 may be used. The regulating member 9 is attached to one of a pair of thread-missing portions 11 and engagement grooves 35 that are 180 degrees apart. However, it may also be attached to the other or both. The regulating shaft portion 40 of the regulating member 9 is interposed between the thread-missing portion 11 and the engagement groove 35. As shown in FIG. 4 , the regulating shaft portion 40 engages with the engagement groove 35. A portion of the regulating shaft portion 40 protrudes radially inward from the engagement groove 35. That is, the regulating shaft portion 40 protrudes radially inward from the engagement groove 35 by a predetermined amount while engaging with the engagement groove 35. The engagement amount P1 of the regulating shaft portion 40 with the engagement groove 35 is greater than the protrusion amount P2 of the regulating shaft portion 40 from the engagement groove 35. In a cross-sectional view, most of the regulating shaft portion 40 is engaged with the engagement groove 35. This ensures a stable engagement state of the regulating shaft portion 40, which reliably restricts rotation of the fixing nut 8, as described below. The side surface of the restricting shaft portion 40 is flat and faces the screw missing portion 11 of the reinforcing material 1.

[0038] If the fixing nut 8 attempts to rotate in the loosening direction (counterclockwise in FIG. 4) relative to the reinforcing material 1 from the state shown in FIG. 4, the restricting shaft portion 40 protruding radially inward from the engagement groove 35 will abut against the thread-missing portion 11 of the reinforcing material 1, as shown in FIG. 10. The restricting member 9 abuts against the thread-missing portion 11 and cannot rotate any further. Therefore, the fixing nut 8 cannot rotate any further either. This restricts the rotation of the fixing nut 8 in the loosening direction.

[0039] An outline of the construction procedure is shown in Figures 8 and 9. Note that the support plate 7 and other components are not shown. First, as shown in Figure 8, the anchoring nut 8 is screwed onto the head of the reinforcement material 1. The example in Figure 8 shows a case where the upper end surface 8a of the anchoring nut 8 is located higher than the upper end surface 1a of the reinforcement material 1. However, the height of the anchoring nut 8 relative to the reinforcement material 1 is arbitrary and may vary for each reinforcement material 1. As shown in Figure 8, the upper end surface 1a of the reinforcement material 1 may be located lower than the upper end surface 8a of the anchoring nut 8, or the upper end surface 1a of the reinforcement material 1 and the upper end surface 8a of the anchoring nut 8 may be flush with each other, or the upper end surface 1a of the reinforcement material 1 may be located higher than the upper end surface 8a of the anchoring nut 8. In other words, the reinforcement material 1 may protrude higher than the anchoring nut 8.

[0040] After the fixing nut 8 is screwed onto the reinforcing material 1, the restricting member 9 is inserted from the upper end opening of the fixing nut 8 into the radial space between the fixing nut 8 and the reinforcing material 1. As shown in FIG. 9, the restricting member 9 is inserted until the operating part 41 abuts against the upper end surface 1a of the reinforcing material 1. Then, the cap 36 is screwed onto the fixing nut 8.

[0041] As described above, in this embodiment, an engagement groove 35 is provided on the inner peripheral surface of the fixing nut 8, and the restricting shaft portion 40 of the restricting member 9 is inserted between the thread-missing portion 11 of the reinforcing material 1 and the engagement groove 35 of the fixing nut 8. The restricting shaft portion 40 of the restricting member 9 restricts the rotation of the fixing nut 8, preventing the fixing nut 8 from loosening. Furthermore, since the restricting member 9 can be inserted from the upper opening of the fixing nut 8, the operation is easy, and the restricting member 9 can also be easily removed from the upper opening of the fixing nut 8 during inspection, etc.

[0042] The restricting member 9 is provided with an operating portion 41. Inserting the restricting shaft portion 40 is simple; it is sufficient to insert the operating portion 41 until it contacts the upper end surface 1a of the reinforcing material 1. Furthermore, because the operating portion 41 is located above the upper end surface 1a of the reinforcing material 1, the operating portion 41 can be easily seen from above when the cap 36 is not attached. Therefore, by visually checking the operating portion 41, it is easy to determine whether the insertion of the restricting member 9 is complete. In particular, because the restricting member 9 does not rotate around the axis of the restricting shaft portion 40 in a plan view, the position of the restricting member 9 in a plan view is constant, and the operating portion 41 faces the center of the reinforcing material 1. Therefore, the operating portion 41 can be quickly seen, and the presence or absence of the restricting member 9 can be determined. Furthermore, when removing the restricting member 9, the upper protrusion 42 can be grasped with a tool or the like, making the removal process easy. Because the upper protrusion 42 is located near the center of the reinforcing material 1, it can be easily grasped.

[0043] The restricting member 9 may have various shapes. For example, as shown in FIG. 7(b), the operating portion 41 may be curved upward in an arc shape. Because the operating portion 41 is curved upward, it can be easily grasped and pulled out. Alternatively, the restricting member 9 can be pulled out by hooking a hook or the like on the underside of the operating portion 41. The restricting member 9 may also be a round bar instead of the square bar described above.

[0044] The fixing nut 8 may also have various configurations. For example, it may have a configuration without a sheath portion as shown in FIG. 11. It may also have a configuration without a cap 36. That is, the upper opening of the fixing nut 8 may remain open without being closed. Furthermore, as shown in FIG. 12(a), the reinforcing material 1 may protrude upward from the upper end surface 8a of the fixing nut 8. In this case, as shown in FIG. 12(b), the restricting member 9 may be attached in the opposite radial direction, and the operating portion 41 may abut against the upper end surface 8a of the fixing nut 8 instead of the upper end surface 1a of the reinforcing material 1. The upper protrusion 42 may also be omitted.

[0045] Furthermore, the pressing surface 30 of the fixing nut 8 does not have to be spherical. For example, as shown in Figure 13, the pressing surface 30 of the fixing nut 8 may be flat. Furthermore, the lower end surface of the fixing nut 8 may serve as the pressing surface 30. Similarly, the pressure-receiving surface 20b of the support plate 7 may also be flat.

[0046] Furthermore, instead of configuring the cap 36 to be detachably screwed onto the fixing nut 8, the cap 36 may be attached to the fixing nut 8 so as to be unremovable. For example, the cap 36 may be driven into the fixing nut 8 with a tool. Although the restricting member 9 is attached so as to be detachable, the restricting member 9 may also be driven into the fixing nut 8 with a tool or the like so as to be unremovable.

[0047] A support plate 7 is arranged as a support member, but for example, a spring may be interposed between the support plate 7 and the fixing nut 8, or the support plate 7 may be omitted and only a spring may be arranged. [Explanation of symbols]

[0048] 1 Reinforcement 1a Upper end surface 2. Slope 3 Drilling 4 Injection material 5 Fixtures 6 Net 7 Support plate (support member) 8 Fixing nut 8a Upper end surface 9 Regulatory elements 10 Male thread 10a Mountain 10b Tanibe 11 Missing screw 20 Upper support plate 20a downward convex part 20b Pressure-receiving surface 21 Lower bearing plate 30 Pressing surface 31 Nut part 32 Pressing section 33 Sheath 34 Female thread 34a Mountain 34b Tanibe 35 Engagement groove 36 Cap 37 Male thread for cap 40 Regulating shaft 41 Operation section 42 Upper protrusion W Width of engagement groove D Engagement groove depth P1 engagement amount P2 protrusion amount

Claims

1. A reinforcing material having a male thread portion and being installed on a slope; a fixing nut that is screwed onto the head of the reinforcing material that protrudes from the slope; a support member disposed between the inclined surface and the fixing nut and pressed toward the inclined surface by the fixing nut; a restricting member that restricts rotation of the fixing nut relative to the reinforcing material, A thread missing portion in which a portion of the entire circumference of the male thread portion is missing is provided along the axial direction on the outer peripheral surface of the head of the reinforcing material, An engagement groove is provided on the inner peripheral surface of the fixing nut along the axial direction, A slope stabilization structure in which a restricting member is interposed between a thread-missing portion of a reinforcement material and an engagement groove of a fixing nut, thereby restricting rotation of the fixing nut relative to the reinforcement material.

2. 2. The slope stabilization structure according to claim 1, wherein the regulating member is engaged with the engaging groove and protrudes radially inward from the engaging groove by a predetermined amount.

3. 3. The slope stabilization structure according to claim 2, wherein an engagement amount of the regulating member with the engaging groove is greater than an extension amount of the regulating member from the engaging groove.

4. 4. The slope stabilization structure according to claim 1, wherein the fixing nut has an upper end opening, and the restricting member is axially inserted from the upper end opening of the fixing nut between the thread-missing portion and the engagement groove.

5. 5. The slope stabilization structure according to claim 4, wherein the restricting member is removably inserted between the thread-missing portion and the engagement groove from an upper end opening of the fixing nut.

6. 6. The slope stabilization structure according to claim 5, wherein the regulating member has a regulating shaft portion extending along the axial direction of the reinforcing material, and the regulating shaft portion is inserted between the thread-missing portion and the engagement groove.

7. 7. The slope stabilization structure according to claim 6, wherein the regulating member has an operating portion at an upper end of the regulating shaft portion, the operating portion being provided between the thread-missing portion and the engagement groove so as not to be able to enter therebetween.

8. 8. The slope stabilization structure according to claim 7, wherein the operating portion abuts against an upper end surface of the reinforcing member or an upper end surface of the fixing nut to stop axial movement of the regulating member.

9. 9. The slope stabilization structure according to claim 8, wherein the operating portion is bent relative to the regulating shaft portion.

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