JP4815520B2 - Fixing hardware, slope stabilization structure and slope stabilization method using the same - Google Patents

Description

  The present invention relates to a fixing metal which can be suitably used for fixing a frame to a slope with a ground anchor, a slope stabilization structure and a slope stabilization method using the same.

  In order to stabilize the slope on slopes, slope construction methods are widely implemented, such as constructing a frame as a slope reaction body on the slope, or fixing a metal net on the slope. For example, when forming a frame on sloping ground, an insertion hole is formed at the intersection of the frame, and a hole is formed in the slope by communicating with the insertion hole, and grout is filled in the hole and inserted. A ground anchor is buried over the hole and the drilled hole. After hardening the grout, a nut member as a fixing hardware is tightened while applying a tensile force to the ground anchor with a jack, and the nut member is attached to the end of the ground anchor. And then removing the jack, and then covering the ends of the nut member and the ground anchor with a protective cap, and a method for stabilizing the slope to fix the slope to the slope is widely adopted (for example, Patent Document 1 reference.).

JP 2000-345560 A

  However, in the slope stabilization method described in Patent Document 1, the protective cap that covers the end of the ground anchor protrudes greatly out of the surface of the frame, and the appearance of the frame is reduced by the protective cap. is there. In addition, when applied to the slope of the entire greening, there is a problem that the tip of the protective cap as an artificial foreign matter protrudes from the vegetation and the appearance of the slope is lowered. In addition, if the protective cap protrudes outward, there is a concern that cars and pedestrians may come into contact with the protective cap on the road, resulting in damage to the automobile and injury to pedestrians. Since the protective cap is made of an aluminum casting, the protective cap itself may be damaged by the contact. Furthermore, in the slope reaction body constructed for revetment, when the slope reaction body is immersed by water increase or the like, there is a problem that the drifting object hits the protection cap and the protection cap is damaged.

  An object of the present invention is to set a protrusion from a slope reaction force body such as a law frame as low as possible to prevent deterioration of the appearance of the law frame and to prevent damage due to contact with other objects and It is to provide a slope stabilization structure and a slope stabilization method.

  The fixing hardware according to the present invention is fixed to the end of the ground anchor constructed on the slope, and is fastened to the end of the ground anchor in a state where a tensile force is applied to the ground anchor via a jack. A fixing metal for fixing the surface reaction force body on the slope, and in the insertion hole formed in the slope reaction force body, in the middle of the length direction of the male screw portion provided at the end of the ground anchor A screwing portion that is screwed so as to be position-adjustable, a pressing portion that presses the slope reaction force body from above, and a connecting portion that connects the screwing portion and the pressing portion. In addition, in this specification, the slope reaction body is a spraying frame, a spot-casting concrete frame, a precast concrete pressure plate, an iron pressure plate, an aluminum alloy, which is constructed on the slope to stabilize the slope.・ Reinforced plastic pressure plate, mortar spraying, concrete spraying, etc. The ground anchor has a well-known configuration having a fixed portion fixed to the inner portion of the drilling hole and a tension portion that applies a tensile force to the slope via a fixing metal.

  In this fixing metal, the fixing metal is screwed into the male threaded portion of the ground anchor, and then the fixing metal is rotated while the tensioning force is applied to the ground anchor with a jack. By tightening the male screw portion, the fixing metal pressing portion is brought into pressure contact with the slope reaction force body, and the slope reaction force body is fixed on the slope with the fixing hardware. In this fixing metal, the slope reaction force body can be fixed to the slope by fastening the screwed portion of the fixing metal to the male thread portion of the ground anchor in the insertion hole formed in the slope reaction body. The end of the anchor can be prevented from protruding outside the slope reaction force body, and the amount of fixing hardware protruding from the slope reaction body can be reduced, so even when fixing hardware is installed on the road, Fixing hardware can be prevented from coming into contact with automobiles and pedestrians, and even when used as a slope reaction force body for revetment, it can be prevented from coming into contact with drifting objects at the time of water increase.

  Here, it is possible to form an operation portion including a concave portion or a convex portion for rotational operation on the presser portion. In this case, the fixing hardware can be easily moved with respect to the ground anchor by rotating the fixing hardware using an operation portion having a simple structure including a concave portion or a convex portion provided in the fixing metal pressing portion. Can be fastened.

  A through hole through which the wire of the ground anchor is inserted is formed in the male screw part, and a wedge member is inserted into an end of the through hole in a state where the wire is inserted into the through hole, and the wire is inserted into the male screw part. Can be engaged so that the length can be adjusted. The position adjustment of the fixing hardware relative to the length direction of the ground anchor can be adjusted by rotating the fixing metal and adjusting the screwing position of the threaded portion with respect to the male screw portion. The amount of rotation operation increases, and the adjustment work becomes complicated. Then, if it comprises so that the engagement position of the external thread part with respect to a wire may be adjusted with a wedge member like this invention, the engagement position of the wire with respect to an external thread part can be largely adjusted with a wedge member. When the adjustment amount is insufficient, the fixing metal can be easily adjusted in the length direction of the ground anchor by finely adjusting the screwing position of the screwing portion with respect to the male screw portion.

  A presser plate may be interposed between the presser part and the slope reaction force body. In this case, the tensile force from the ground anchor that acts on the fixing hardware can be transmitted to the slope reaction body through the presser plate with a large contact area, so the damage to the slope reaction body due to stress concentration is effective. Can be prevented.

  It is also a preferred embodiment to form a partially spherical receiving seat and an abutting portion that abuts between the pressing portion and the pressing plate. In this case, even if the angle formed between the slope reaction force body and the ground anchor is not a right angle, the angle of the fixing hardware can be adjusted between the receiving seat and the contact portion. In addition, it is possible to close the insertion hole securely by making the presser part in close contact with the presser plate, and to reliably apply the tensile force of the ground anchor to the slope reaction force body. Can effectively prevent the intrusion of rainwater.

  In the slope stabilizing structure according to the present invention, a drilling hole and an insertion hole are provided in a continuous manner on the slope and a slope reaction body constructed on the upper side thereof, and a ground anchor is embedded in the insertion hole and the drilling hole. The fixing hardware according to any one of claims 1 to 5 is assembled over a ground anchor and a slope reaction body, and the slope reaction body is fixed to the slope via the fixing hardware. is there. In this slope stabilizing structure, since the slope reaction force body is fixed to the slope using the fixing bracket, the same effect as described above can be obtained.

  In the slope stabilization method according to the present invention, an insertion hole is formed in the slope reaction force body and a drill hole is formed in the slope by communicating with the insertion hole, and a ground anchor is embedded between the insertion hole and the drill hole. The fixing metal fitting according to any one of claims 1 to 5 is screwed in the vicinity of an end of the ground anchor, and a jack is connected to the end of the ground anchor. The fixing metal is fastened to the ground anchor while pulling, and then the jack is removed to fix the slope reaction force body to the slope through the fixing metal. In this slope stabilization method, since the slope reaction force body is fixed to the slope using the fixing bracket, the same effect as described above can be obtained.

  According to the fixing hardware according to the present invention, the slope stabilization structure and the slope stabilization method using the same, the screwing portion of the fixing hardware is inserted into the male anchor of the ground anchor in the insertion hole formed in the slope reaction body. By fastening to the screw part, the slope reaction body can be fixed to the slope, and the end of the ground anchor is prevented from projecting outside the slope reaction body. Since the amount of fixing hardware can be reduced, even when fixing hardware is installed on the road, it can be prevented from coming into contact with automobiles and pedestrians. It is possible to prevent contact with drifting objects when the water increases.

Cross section of slope stabilization structure Expanded sectional view of the main part of the slope stabilization structure Exploded perspective view of fixing hardware (A) (b) is explanatory drawing of the construction method of a slope stabilization structure (A) (b) is explanatory drawing of the construction method of a slope stabilization structure Explanatory drawing of construction method of slope stabilization structure Expanded cross-sectional view of the main part of the slope stabilization structure using fixing hardware of other configurations Expanded cross-sectional view of the main part of the slope stabilization structure using fixing hardware of other configurations Expanded cross-sectional view of the main part of the slope stabilization structure using fixing hardware of other configurations Expanded cross-sectional view of the main part of the slope stabilization structure using fixing hardware of other configurations

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1 to FIG. 3, the slope stabilization structure is composed of a slope frame 2 as a slope reaction force body constructed on the slope face 1, and a grinding provided in a continuous manner on the slope face 1 and the slope frame 2. A hole 3 and an insertion hole 4, a ground anchor 10 embedded in the insertion hole 4 and the drilling hole 3, and a tensile force acting on the ground anchor 10 with a jack, The fixing frame 20 is fastened, and the frame 2 is fixed to the slope 1 via the fixing plate 20, and the slope 1 is stabilized by the frame 2.

  The frame 2 is constructed by a well-known construction method. For example, after leveling the slope 1 made of sloped land, lay a metal net (not shown) and place a non-illustrated bar on it, and then spray mortar along the bar. Will do. In the present embodiment, in order to construct the ground anchor 10 on the slope 1, a cylindrical mold 5 is installed in advance at a position corresponding to the intersecting portion 2 c of the vertical frame 2 a and the horizontal frame 2 b. In this state, the mortar is sprayed, and the insertion hole 4 is formed in the intersecting portion 2 c by the mold 5. Further, in order to fix the slope frame 2 to the slope surface 1, after the construction of the slope frame 2, first, as shown in FIG. The communicating hole 3 is formed, and then, as shown in FIG. 4 (b), the grout 6 is filled into the hole 3 with the ground anchor 10 loaded between the insertion hole 4 and the hole 3. The ground anchor 10 is embedded in the grout 6 leaving the upper end portion, and the fixing frame 20 is fixed to the slope 1 by assembling the fixing metal 20 after the grout 6 is cured.

  The ground anchor 10 is coated with a covering material made of a PC steel wire, a PC steel strand, a multiple PC steel strand, a PC steel rod, a carbon fiber strand, etc., and a fixing portion 11 to the ground is provided at the tip. Provided, a tension portion 12 is provided in the middle portion, a male screw portion 13 is provided at the upper end portion, and a jack connecting tool 7 is screwed into the male screw portion 13 so that a tensile force can be applied to the tension portion 12. It is of the well-known structure. The ground anchor 10 is embedded in the hole 3 so that the upper end portion of the male screw portion 13 is disposed at a position slightly lower than the upper surface of the method frame 2.

  As shown in FIGS. 1 to 3, the fixing hardware 20 is attached to the end of the ground anchor 10 constructed on the slope 1 to fix the slope frame 2 as a slope reaction body on the slope 1. The fixing hardware main body 21 fastened to the male screw portion 13 of the ground anchor 10, the presser plate 30 disposed between the pressing portion 22 of the fixing hardware main body 21 and the frame 2, and the fixing hardware main body 21 are detachable. And a lid member 35 attached to the lid.

  The presser plate 30 is formed of a circular or rectangular metal plate, and the presser plate 30 has a diameter or one side length larger than the diameter of the insertion hole 4 and smaller than the width of the normal frame 2. 30, the opening of the insertion hole 4 is closed, and a tensile force acting on the holding plate 30 toward the slope 1 is transmitted to the frame 2. A through hole 32 is formed in the center portion of the presser plate 30, and a partially concave spherical receiving seat 31 is formed on the upper surface side of the through hole 32. However, as the receiving seat 31, it is also possible to provide a receiving seat having a tapered surface shape whose diameter increases toward the upper side at the edge of the through hole 32.

  The fixing hardware main body 21 includes a screwing portion 23 screwed so as to be position-adjustable with the male screw portion 13 of the ground anchor 10 in an insertion hole 4 formed in the method frame 2, and a presser portion 22 for pressing the method frame 2 from above. And a connecting portion 24 that connects the screwing portion 23 and the presser portion 22. The connecting portion 24 is formed in a cylindrical shape, the presser portion 22 is formed in an annular shape extending outward from the upper end portion of the connecting portion 24, and the screwing portion 23 is an inner periphery of the flange portion extending inward from the lower end portion of the connecting portion 24. The fixing hardware main body 21 is integrally formed of a metal cylindrical member with a bottomed hook.

  The presser portion 22 is formed with a partially convex spherical contact portion 25 that fits the receiving seat 31 formed on the presser plate 30, and the fixing metal main body 21 is fastened to the ground anchor 10, so that the contact portion 25 receives the presser portion 22. It is configured so as to be pressed against the seat 31 with almost no gap and to seal between the presser portion 22 and the presser plate 30. However, in the present embodiment, the receiving seat 31 and the contact portion 25 are formed in a partially convex spherical shape protruding toward the slope 1 side, but may be formed in a partially convex spherical shape protruding toward the opposite side. Further, since the ground anchor 10 can be constructed at a substantially right angle with respect to the normal frame 2, a contact portion and a receiving seat made of a flat surface may be provided instead of the partially convex spherical contact portion 25 and the receiving seat 31. Is possible. Specifically, like the fixing metal 20A shown in FIG. 7, a contact portion 25A made of a flat surface is formed on the lower surface of the holding portion 22 of the fixing metal main body 21 on the side of the normal frame 2, and the center of the pressing plate 30 is formed. It is also possible to form an accommodation recess 29 in which the presser part 22 is accommodated in the part, form a receiving seat 31A made of a flat surface on the bottom surface, and receive the contact portion 25A with the receiving seat 31A.

  The center portion of the presser portion 22 and the connecting portion 24 accommodates the male screw portion 13 of the ground anchor 10 protruding from the screwing portion 23 and is connected to the male screw portion 13 so as to be detachably screwed (see FIG. 7). 5 (see FIG. 5B) is formed. An operation part 27 composed of a plurality of recesses is formed on the upper part of the presser part 22 at intervals in the circumferential direction. A tool is fitted into the operation part 27 so that the fixing hardware main body 21 can be rotated. Yes. However, as the operation portion 27, a convex portion can be formed instead of the concave portion, the outer peripheral portion of the presser portion 22 is formed in a polygonal shape in plan view, or the upper end opening of the accommodating portion 26 is seen in plan view. It is also possible to form it in a polygonal shape so that it can be operated with a general-purpose or dedicated tool.

  The connecting portion 24 can be formed in a shape other than a cylindrical shape as long as the presser portion 22 and the screwing portion 23 can be integrally connected. However, intrusion of rainwater or the like into the insertion hole 4 is possible. In order to prevent as much as possible, it is preferable to form in a cylindrical shape.

  A fitting ring portion 28 is formed in a protruding shape on the outer peripheral portion of the upper surface of the presser portion 22, and a disc-shaped lid member 35 is fitted and fixed to the presser portion 22 inside the fitting ring portion 28, thereby accommodating the presser portion 22. The upper end opening of the portion 26 is configured to be closed. However, the lid member 35 can be configured to be fixed to the fixing hardware 20 with a screw or the like, or a lid member capable of closing the upper end opening of the receiving seat of the presser plate 30 can be provided.

Next, a method for constructing a slope stabilizing structure using the fixing hardware 20 will be described.
First, as shown in FIG. 4 (a), a drilling hole 3 communicating with the insertion hole 4 is formed on the slope 1 by a boring machine not shown, and then, as shown in FIG. 4 (b). In the state where the ground anchor 10 is loaded over the insertion hole 4 and the drilling hole 3, the grout 6 is filled with the grout 6, and the ground anchor 10 is embedded in the grout 6 while leaving the upper end portion. However, it is also possible to insert the ground anchor 10 into the grout 6 after filling the grout 6 into the hole 3.

  Next, as shown in FIG. 5A, the connecting portion 24 is inserted into the through hole 32 of the presser plate 30 with the presser plate 30 placed on the upper surface of the method frame 2 so as to close the insertion hole 4. Then, the fixing hardware main body 21 is disposed, and the fixing metal main body 21 is attached to the ground anchor 10 by screwing the screwing portion 23 of the fixing metal main body 21 with the male screw portion 13 of the ground anchor 10. However, the presser plate 30 is inserted and disposed in the male screw portion 13 of the ground anchor 10 and the screw fitting portion 23 is screwed into the male screw portion 13 so that the fixing hardware main body 21 is attached to the ground anchor 10. The anchor 10 can be embedded in the hole 3. In addition, the inside of the insertion hole 4 may be left as it is, or it can be filled with a filler or the like.

  Next, after the grout 6 in the hole 3 is hardened, as shown in FIG. 5B, the jack 7 (not shown) is screwed into the end portion of the male screw portion 13, and FIG. As shown in FIG. 4, while a tensile force is applied to the ground anchor 10 with a jack, a tool is fitted to the operation portion 27 to fasten the fixing hardware main body 21 to the male screw portion 13 of the ground anchor 10, thereby fixing the fixing hardware 20. Accordingly, the fixing hardware 20 is assembled so that a predetermined tensile force always acts on the method frame 2, and the method frame 2 is fixed on the slope 1. Further, with the fixing hardware main body 21 fastened to the ground anchor 10, the jack is removed, the lid member 35 is attached to the fixing hardware main body 21, and the installation of the fixing hardware 20 is completed.

  When the fixing frame 20 is fixed using the fixing hardware 20 having such a configuration, only the thickness of the presser plate 30 protrudes outward from the fixing frame 2. By reducing the amount of protrusion, it is possible to prevent the appearance of the method frame 2 from being deteriorated by the fixing metal 20 and to prevent the fixing metal 20 from being damaged due to contact with other objects. In addition, since the contact portion 25 is pressed against the receiving seat 31 with almost no gap and the space between the holding portion 22 and the holding plate 30 is sealed, even when the angle between the center line of the ground anchor 10 and the normal surface 1 is not a right angle, It is possible to prevent a gap from being formed between the contact portion 25 and the receiving seat 31 and prevent the ground anchor 10 from being rusted when rainwater or the like enters the insertion hole 4.

  The fixing hardware main body 21 and the presser plate 30 are preferably divided in order to reduce the manufacturing cost of the fixing hardware 20 and prevent intrusion of rainwater or the like into the insertion hole 4, but FIG. The fixing metal body 21 and the presser plate 30 in the above-described embodiment are formed as an integrally molded product, and a hook-shaped presser portion 22B extending outward is provided at the end of the connecting portion 24, as shown in FIG. The fixing metal main body 21B can also be used. In this case, a rubber sheet or the like is interposed between the presser part 22B of the fixing hardware body 21B and the legal frame 2 so that no gap is formed between the presser part 22B and the legal frame 2, and rainwater or the like enters. It can also be configured to prevent this. However, as shown in FIG. 9, a flat pressing plate 50 is provided between the holding portion 22B of the fixing metal 20B and the method frame 2, and the holding force of the holding plate 50 is applied to the tensile force from the ground anchor 10 acting on the method frame 2. It may be dispersed in the legal frame 2 via

  Further, as the ground anchor 10, a plurality of tensile members having end portions fixed to the male screw portion 13 are used. However, like the ground anchor 40 shown in FIG. 10, a through hole 42 a through which the tensile material 41 is inserted is used. It is also possible to employ a wedge member 43 that is provided with the formed male screw member 42 and is externally attached to the tension member 41 so that the tension member 41 is locked to the male screw member 42. In this case, the male screw member 42 is screwed into the screwing portion 23 of the fixing hardware main body 21, the tensile material 41 is inserted into the male screw member 42, and then a plurality of tensile materials 41 are pulled with a jack, The tensile member 41 is locked to the male screw member 42 with the wedge member 43 while a tensile force is applied to the tensile member 41, and then the jack is removed, and then the tensile member 41 is cut near the wedge member 43. The fixing hardware 20 can be assembled so that a predetermined tensile force acts on the frame 2.

  In this embodiment, the fixing hardware 20 used when fixing the frame 2 to the slope 1 as a slope reaction body has been described, but concrete is sprayed as a slope reaction body with a substantially constant thickness. The fixing hardware 20 can be similarly applied to a case where a slope reaction force body or a metal net is fixed to the slope 1 and the slope 1 is stabilized by the metal net.

DESCRIPTION OF SYMBOLS 1 Slope 2 Method frame 2a Vertical frame 2b Horizontal frame 2c Crossing part 3 Cutting hole 4 Insertion hole 5 Formwork 6 Grout 7 Connector 10 Ground anchor 11 Fixing part 12 Pulling part 13 Male thread part 20 Fixing hardware 21 Fixing metal body 22 Holding portion 23 Screwing portion 24 Connecting portion 25 Abutting portion 26 Accommodating portion 27 Operating portion 28 Fitting ring portion 20A Fixing hardware 25A Abutting portion 29 Accommodating recess 31A Receiving seat 20B Fixing hardware 21B Fixing hardware main body 22B Holding plate 30 Holding plate 31 receiving seat 32 through hole 35 lid member 40 ground anchor 41 tension member 42 male screw member 42a through hole 43 wedge member 50 seat plate

Claims (7)

It is fixed to the end of the ground anchor applied to the slope, and it is fastened to the end of the ground anchor with a tensile force acting on the ground anchor via a jack. Fixing hardware to be fixed to
In the insertion hole formed in the slope reaction force body, a threaded portion that is screwed so as to be position-adjustable to a middle portion in the length direction of the male screw portion provided at the end of the ground anchor;
A presser part for pressing the slope reaction force body from above;
A connecting portion that connects the screwing portion and the presser portion;
Fixing hardware characterized by comprising.   The fixing hardware according to claim 1, wherein an operation portion including a concave portion or a convex portion for rotation operation is formed on the pressing portion.   A through hole through which the wire of the ground anchor is inserted is formed in the male screw part, and a wedge member is inserted into an end of the through hole in a state where the wire is inserted into the through hole, and the wire is inserted into the male screw part. The fixing hardware according to claim 1, wherein the fixing metal is engaged so as to be adjustable in length.   The fixing hardware according to any one of claims 1 to 3, wherein a presser plate is interposed between the presser portion and a slope reaction force body.   The fixing hardware according to claim 4, wherein a partially spherical receiving seat and an abutting portion abutting on the receiving surface are formed between the pressing portion and the pressing plate. A drilling hole and an insertion hole are provided in a continuous manner on the slope and the slope reaction body constructed on the upper side,
A ground anchor is provided in an embedded shape across the insertion hole and the drilling hole,
The fixing hardware according to any one of claims 1 to 5 is assembled over a ground anchor and a slope reaction body, and the slope reaction body is fixed to the slope via the fixing hardware.
Slope stabilization structure characterized by that. Form an insertion hole in the slope reaction force body and communicate with the insertion hole to form a hole in the slope.
Embed a ground anchor over the insertion hole and drilling hole,
The fixing hardware according to any one of claims 1 to 5 is screwed in the vicinity of an end portion of the ground anchor, a jack is connected to the end portion of the ground anchor, and the ground anchor is pulled by the jack. , Fasten the fixing hardware to the ground anchor, then remove the jack and fix the slope reaction force body to the slope through the fixing hardware,
Slope stabilization method characterized by that.

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