JP4993774B2 - Anchor device and anchor - Google Patents

Description

  The present invention relates to an anchor device and an anchor.

  As an example of a conventional ground anchor device, there is an anchor device composed of an anchor plate having a bent portion with a V-shaped cross section at the center in the width direction and a connecting body provided at the bent portion of the anchor plate (for example, Patent Document 1). In this anchor device, an anchor plate and a connecting body are embedded in the ground. Since there is a connecting body, it is actually difficult to drive into the ground, and a hole is dug in the ground. However, since it is extremely difficult to dig a hole in the slope, this anchor device is not necessarily suitable for installation on a slope.

JP 2002-115252 A

  In particular, the present invention provides an installation method of an anchor device with good workability suitable for a slope.

  The present invention also provides a method for installing an anchor device with good workability applicable not only to a slope but also to a ground having a substantially horizontal ground surface.

  Another object of the present invention is to provide an anchor particularly suitable for the above installation method.

  Furthermore, this invention provides the anchor apparatus installed by the said installation method.

  The anchor device installation method according to the present invention provides an anchor having a rope connecting portion for connecting one end of a rope at a central portion in a longitudinal direction or between the central portion and a tip portion, At a place to be fixed, a guide hole is drilled in a substantially vertical direction in the ground below the slope at least to a depth corresponding to the length from the rear end of the anchor to the rope connecting portion, and the guide hole is cut along the guide hole. A lead-out hole that communicates with the guide hole in a substantially horizontal direction from a location farther below the slope than the guide hole to a position below the slope when the anchor is fixed. The end of the rope is connected to the rope connecting portion of the anchor, and the other end of the rope passed through the guide hole and the extraction hole is extended from the extraction hole to the ground surface. The car is to pouring along the guide hole.

  Anchors are called by various names such as anchor rods, pipe anchors, rock bolts, drilling (drilling) rods, that is, solid or hollow, regardless of whether the cross section is circular or polygonal (irregular) Include all rods used as anchors.

  The rope is a concept including a wire, a wire rope, and the like, and most commonly a steel stranded wire is used.

  The portion located below when the anchor is placed in the ground is called the tip of the anchor, and the opposite side is called the rear end. The center portion in the longitudinal direction of the anchor means a range of about 1/3 or 1/3 of the length of the anchor with the center in the longitudinal direction of the anchor as the center. Which part (position) in the longitudinal direction of the anchor connection part depends on the shape of the anchor (the presence or absence of blades, the number of blades and their mounting position, etc.), but is added to the anchor through the rope and rope connection part. It is preferable to use a portion (position) where the position and posture of the anchor anchored in the ground do not change as much as possible.

  The rope connecting part is provided with a member (fastener, fixing tool, hanging tool) for hooking (connecting) a hook, ring or other rope or connecting (connecting) a connecting tool provided at one end of the rope. Or when the rope is hung on the anchor body (when it is connected) (when the rope is wound around the anchor body, a ring is formed at one end of the rope) Including the insertion of the anchor body into this ring, etc.), and a portion for positioning the rope so that the position of the rope does not shift.

  If the guide hole is drilled to a depth corresponding to at least the length from the rear end of the anchor to the rope connecting portion, the guide hole communicates with the drawer hole when the drawer hole is drilled. Preferably, when driving the entire length of the anchor into the ground, the workability is good if the guide hole is drilled to a depth corresponding to the total length of the anchor.

  The diameter of the guide hole is determined to be a size suitable for guiding the anchor driving and a size suitable for passing the rope. The diameter of the extraction hole shall be determined to be suitable for passing the rope.

  When the anchor is driven into the ground or after it is driven, the anchor may be fixed to the ground with a solidified material or the like. At this time, it is preferable to pull the other end of the rope.

  According to the present invention, the guide hole and the extraction hole need only be drilled, so that the workability is better than the case where the anchor and the rope are buried in the slope. In addition, the anchor strength is high because the longitudinal direction of the anchor and the direction of the tensile force applied through the rope are almost perpendicular.

  The present invention is not limited to slopes but can be applied to ground having a substantially horizontal ground surface. The anchor device installation method according to the present invention which can be applied to a ground surface having a substantially horizontal ground surface is a rope connection for connecting one end of a rope to the central part in the longitudinal direction or from the central part to the tip part. An anchor having a portion is prepared, and at a place where the anchor is to be anchored, a guide hole having a length corresponding to at least the length from the rear end of the anchor to the rope connecting portion is drilled from the ground surface into the ground. When the anchor is fixed along the guide hole, it communicates with the guide hole almost perpendicularly to the guide hole from the ground surface away from the guide hole toward the position where the rope connecting portion is located. Drilling out the drawing hole, connecting one end of the rope to the rope connecting portion of the anchor, and connecting the other end of the rope that has passed through the guide hole and the drawing hole from the drawing hole to the ground surface. In a state in which out has, the anchor is to pouring along the guide hole.

  The surface of the earth refers to all exposed surfaces of slopes, rocks, earth, and other earth surfaces in forests, mountains, etc., and the underground refers to the inside of the surface (including surface soil layers, gravel soil, rocks, etc.). .

  In the case of ground with an almost horizontal surface, the guide hole is drilled slightly obliquely from the direction perpendicular to the ground surface, and the anchor is driven obliquely. Since the direction of the applied tension is kept almost perpendicular, the proof strength of the anchor is large. In addition, since the guide hole and the extraction hole only need to be drilled, workability is better compared to digging a large hole in the ground and burying the anchor and rope.

  In any of the anchor device installation method on the slope and the anchor device installation method applicable to the ground surface having a substantially horizontal ground surface, the rope is preferably passed from the lead-out hole to the guide hole or vice versa. The one end of the rope to the ground surface from the guide hole, and the other end of the rope to the ground surface from the extraction hole, the one end of the rope to the rope connecting portion of the anchor Link. The rope can be passed through the guide hole through the guide hole or vice versa, but it is generally easier to insert one end of the rope through the draw hole and pull up the other end of the rope from the guide hole. . If possible, after cutting the guide hole and the lead hole, one end of the rope may be connected to the anchor, and then the other end of the rope may be passed from the guide hole to the lead hole and pulled out from the lead hole.

  A tensile force is applied to the other end of the rope that is led out to the surface of the earth from the lead-out hole. That is, the rope is stretched using the other end of the rope. The rope itself connected to the anchor may be stretched, or another rope may be stretched by connecting another rope to the other end of the rope connected to the anchor.

  Depending on the purpose, the above-mentioned ropes drawn to the ground surface from the lead-out holes are connected to these ropes, for example, as ropes constituting rope nets for rockfall prevention, ropes for reinforcement of protective fences, etc. Is stretched. Since the rope tensioning direction is determined in accordance with the purpose of the anchor device and the rope tensioning purpose, the direction of the above-mentioned drawing hole may be determined according to the rope tensioning direction.

  In a preferred embodiment, a load direction conversion member is disposed in the vicinity of the opening on the ground surface of the extraction hole so that the longitudinal direction is substantially perpendicular to the tension direction of the rope, and the rope is in contact with the load direction conversion member. Apply tension to the rope.

  The load direction changing member may be solid or hollow. Moreover, about the hollow thing, the both ends may be opened or closed. The load direction changing member preferably has an earth pressure surface having a circular cross section. Here, the circular arc section includes not only a part of a circle but also an ellipse and other curves. The size (length, width, etc.) of the load direction conversion member can be determined or changed as appropriate according to the nature (hardness, depth) of the ground (surface soil layer) (underground) at the place of installation. . The load direction conversion member is disposed with the earth pressure surface on the ground surface side. That is, the load direction changing member is placed in a state where the arc-shaped earth pressure surface is in contact with the ground surface, or a part or almost all of it is buried in the ground.

  The load direction conversion member keeps the tension direction of the rope drawn to the ground surface in a substantially perpendicular relationship with the longitudinal direction of the anchor, so that the proof strength of the anchor can be maintained.

  The anchor according to the present invention is formed with a positioning portion for preventing the displacement of the rope hung on the anchor body at the center in the longitudinal direction of the anchor body or between the center and the tip. . An anchor body is a rod-shaped part of an anchor. The front end, rear end and center of the anchor body are the same as described above with respect to the anchor. The positioning portion corresponds to a portion for positioning the above-described rope.

  The anchor according to the present invention can be suitably used in the above-described anchor device installation method, in particular, a mode in which a rope is hung on the anchor.

  In the case where the anchor is rod-shaped and is not provided with a blade or the like, the positioning portion is preferably provided at the center in the longitudinal direction of the anchor body. When blades are provided, the blades are subjected to a tensile force applied to the rope, so that the position and posture of the anchor anchor are unlikely to change, and the range of positions suitable for positioning is widened from the center. It becomes possible to provide in the range of about 2/3 of the length of the anchor to the tip. When the blade is not near the tip of the anchor, the positioning part is preferably provided except for the tip of the anchor (a range having a length substantially equal to the diameter of the anchor), but the blade is provided near the tip. In some cases, the positioning portion can be provided at the tip.

  The present invention also provides an anchor device. In the anchor device according to the present invention, the anchor is fixed in the ground, and one end of the rope is connected to the center of the anchor in the longitudinal direction or from the center to the tip, and the anchor is connected to the anchor. The above-mentioned rope is pulled almost perpendicularly to the longitudinal direction of the anchor and pulled out to the ground surface.

  As a preferred embodiment, a load direction conversion member is disposed at a location where the rope is drawn to the ground surface so that the longitudinal direction is substantially orthogonal to the tension direction of the rope, and the rope is in contact with the load direction conversion member.

It is a figure which shows the 1st Example anchor apparatus for supporting or reinforcing the rockfall prevention fence. It is a perspective view of the anchor of 1st Example. It is a perspective view of a load direction conversion member. A mode that a guide hole is drilled in the perpendicular direction is shown. A mode that the extraction hole is drilled in the horizontal direction is shown. A mode that a wire rope is passed through a guide hole from an extraction hole is shown. It is a perspective view which shows a mode that the wire rope was connected with the anchor. The anchor is driven into the slope. The load direction changing member is installed and the wire rope is stretched. It is a figure which shows the 2nd Example anchor apparatus for supporting or reinforcing the rockfall prevention fence. It is a perspective view of the anchor of 2nd Example. It is a perspective view which shows a mode that the wire rope was connected with the anchor. The load direction changing member is installed and the wire rope is stretched.

  The anchor device of the first embodiment is for supporting or reinforcing a rockfall prevention fence. In the anchor device 1 shown in FIG. 1, the anchor 10 has a lower part (front end) reaching a stable ground (rock) G2 below the slope surface soil layer G1, and an upper end (rear end) of the anchor 10 is a slope ground surface. (Slope) The anchor 10 as a whole is fixed vertically in the ground below the slope so that it is at the same height as S. A wire rope 20 is hung (connected) on the lower portion (tip portion) of the anchor 10 in the longitudinal direction. At a location farther below the slope than the anchoring position of the anchor 10, a lead-out hole 22 is drilled horizontally from the slope surface into the ground below the slope, and the wire rope 20 is drawn out from the lead-out hole 22 to the ground surface. Yes. In the vicinity of the place where the wire rope 20 is drawn to the ground surface of the slope, the load direction conversion member 30 is installed so that the longitudinal direction thereof is substantially orthogonal to the direction in which the wire rope 20 is stretched. The drawn wire rope 20 is in contact with the load direction changing member 30 so as to be substantially orthogonal to the longitudinal direction thereof, and is connected to the support rope 41 of the rock fall prevention fence 4 installed below the slope S through the turnbuckle 42. Has been. In this way, the anchor device 1 supports or reinforces the rockfall prevention fence 4. In this embodiment, the anchor 10 is fixed in the ground so that the lower part thereof reaches the stable ground G2. However, the lower part of the anchor 10 does not necessarily reach the stable ground G2.

  FIG. 2 shows a perspective view of the anchor. The anchor 10 has a cylindrical body (anchor body) 11 whose length is sufficiently longer than the diameter and whose inside is hollow. Two upper blades 12 and two lower blades 13 are welded to the anchor body 11 or formed integrally with each other at the upper part (rear end part) and the lower part (tip part) of the cylindrical body 11. ing. The upper blade 12 has a trapezoidal shape, the lower blade 13 has a right triangle shape, the upper blade 12 is larger than the lower blade 13, and the lower edges (side edges) of these blades 12, 13 are cylindrical so that both can be driven easily. It is inclined upward as it moves away from the body 11. Further, the tip (lower end) of the anchor main body 11 is formed with a small diameter (tapered) so as to be easily driven into the topsoil layer G1 and the stable ground G2 as it goes forward (lowering downward). An earth pressure plate 14 is welded to the rear end (upper end) of the anchor body 11 in a direction perpendicular to the longitudinal direction of the anchor body 11. The earth pressure plate 14 is fixed (welded) to the upper end of the upper blade 12. A cap 15 is attached to the upper end surface of the cylindrical body 11 to prevent rainwater or the like from entering the anchor body 11. The anchor main body 11, the upper blade 12, the lower blade 13, and the earth pressure plate 14 are made of steel or iron (corrosion-protected by galvanization or the like).

  An insertion notch 16 is formed in the lower part of the lower blade 13 in a direction perpendicular to the longitudinal direction of the anchor body 11 from the oblique side edge of the lower blade 13. A positioning notch (positioning portion) 17 is formed in the lower blade 13 so as to continue upward along the circumferential surface of the anchor body 11 continuously to the insertion notch 16 that has reached the circumferential surface of the anchor body 11. . On the peripheral surface of the anchor body 11, the wire rope 20 is prevented from moving to the same height position (vertical direction position) as the positioning notch 17 and to an angular position approximately in the middle of the two lower blades 13. A positioning rod (positioning portion) 18 is formed integrally with the anchor body 11 or welded to the anchor body 11.

  A wire rope 20 is hung (connected) to the anchor 10 at the positions of the positioning notch 17 and the positioning rod 18 as will be described later. The wire rope 20 is doubled as shown in FIGS. A double end (which forms a ring) is hung on the anchor main body 11 of the anchor 10, and a ring is formed on the other end by a fastener 56 so as to be easily connected to the wire rope 20.

  FIG. 3 shows a load direction changing member. The cylindrical load direction changing member 30 has an outer diameter sufficiently larger than the diameter of the wire rope 20 connected to the anchor 10, and about half of the peripheral surface is the earth pressure surface 30a. The load direction changing member 30 is made of iron, steel, or other strong material. A groove that guides and holds the wire rope 20 in a direction perpendicular to the longitudinal direction in a part of the circumferential surface of the load direction conversion member 30 (a portion opposite to the earth pressure surface 30a) at a substantially central position in the longitudinal direction. 31 is formed. Furthermore, the load direction changing member 30 includes a holding plate 32 for preventing the wire rope 20 from coming off the concave groove 31. The holding plate 32 is longer than the distance (length) from one end of the load direction changing member 30 to the groove 31. The holding plate 32 may be of a size (width and thickness) inserted between the wire rope 20 held in the concave groove 31 and the cylindrical inner wall surface of the load direction changing member 30. One end portion of the holding plate 32 is bent at a right angle to form a locking portion 32 a and is locked to a part of one end surface of the load direction changing member 30. The wire rope 20 is sandwiched between the concave groove 31 and the holding plate 32 in the concave groove 31.

  4 to 9 show the procedure of the anchor device installation method.

  The anchoring position of the anchor 10 is specified in consideration of the positional relationship with the rockfall prevention fence 4 below the slope. The anchor 10 is installed above the slope of the rockfall prevention fence 4.

  In FIG. 4, a guide hole 21 is formed by drilling vertically in the slope ground (surface soil layer G1, bedrock G2) using an air puncher 5 at the fixing position of the anchor 10 specified. The air puncher 5 drives the rod 53a with compressed air supplied from a compressor through a supply pipe 51, for example. The diameter of the rod 53a may be larger than twice the diameter of the wire rope 20 and about the same as the diameter of the anchor body 11 of the anchor 10. Of course, the guide hole 21 may be formed by driving and pulling out an anchor.

  The operator uses the air puncher 5 to drill the guide hole 21 into the ground on the slope S in a substantially vertical direction to a depth corresponding to almost the entire length of the anchor 10. The guide hole 21 may be drilled at least to a depth position corresponding to the length from the upper end of the anchor to the positioning portion (positioning notch 17, positioning rod 18).

  After the guide hole 21 is drilled, the position where the extraction hole 22 is opened is specified. The lead-out hole 22 is below the guide hole 21 and toward the position where the positioning portion (the positioning notch 17 and the positioning rod 18) is located when the anchor 10 is fixed along the guide hole 21. It is preferable that the mounting position of the support rope 41 of the rockfall prevention fence 4 and the guide hole 21 be placed on a straight line so as to communicate with the guide hole 21 in a substantially horizontal direction. After measuring and specifying the position at which the extraction hole 22 is opened, the worker, as shown in FIG. 5, on the slope surface S specified by using the air puncher 5 to which the rod 53b having a slightly smaller diameter is attached. From the position, when the anchor is fixed along the guide hole 21, the extraction hole 22 is drilled in a substantially horizontal direction toward the position where the positioning notch 17 and the positioning rod 18 are located. The extraction hole 22 is drilled until it communicates with the guide hole 21. At this time, the diameter of the rod 53 b of the air puncher 5 may be larger than twice the diameter of the wire rope 20.

  Referring to FIG. 6, after the guide hole 21 and the lead hole 22 communicate with each other, one end of the lead wire 50 is hung on one end of the lead wire 50 (the folded portion of the wire rope 20). The lead wire 50 is connected to one end of the lead wire 50 with a clip or the like, and the other end of the lead wire 50 is inserted from the lead-out hole 22 to the guide hole 21. Then, the other end of the lead wire 50 is pulled out to the slope surface S through the guide hole 21. For example, a lead wire 50 having a loop formed at the other end is used, the other end of the lead wire 50 is inserted from the lead hole 22 to the guide hole 21, and a hook is provided from the upper end opening of the guide hole 21 to the tip. A hook rod is inserted, and a loop of the lead wire 50 is hooked on this hook, and the lead wire 50 is pulled up from the guide hole 21 to the slope S. By pulling the other end of the lead wire 50, one end of the wire rope 20 connected to one end of the lead wire 50 is drawn into the guide hole 21 from the lead-out hole 22, and is pulled out from the guide hole 21 to the slope S. The other end of the wire rope 20 is led out to the slope S from the lead-out hole 22. Of course, the wire rope 20 is inserted through the guide hole 21 from the other end, a hook is inserted into the lead-out hole 22, and the other end of the wire rope 20 is hooked on the hook at the tip. May be pulled out to the slope S.

  As shown in FIG. 7, the ring at the one end of the wire rope 20 drawn from the upper end opening of the guide hole 21 to the slope S is hung on the anchor body 11. That is, the wire rope 20 is inserted into the insertion notch 16 of the lower blade 13 and is fitted into the positioning notch 17. Further, the wire rope 20 is positioned against the peripheral surface of the anchor body 11 while being hooked on the positioning rod 18. On the circumferential surface of the anchor body 11, the double wire ropes 20 positioned at the opposite side of the positioning rod 18 are bundled and fastened by a fastener 57 (see FIG. 8). After the one end of the wire rope 20 is hung on the anchor 10, the other end of the wire rope 20 may be inserted into the extraction hole 22 from the guide hole 21 and pulled out to the slope S from the extraction hole 22.

  In FIG. 8, the anchor 10 is driven into the ground along the guide hole 21. At this time, the surface of the upper blade 12 and the lower blade 13 is substantially perpendicular to the direction in which the wire rope 20 is stretched, and the portion to which the wire rope 20 is fastened (the portion of the fastener 57) After driving, the anchor 10 is arranged and driven so as to look through the extraction hole 22. When the anchor 10 is driven, the wire rope 20 drawn out from the lead-out hole 22 is pulled.

  In FIG. 9, after anchoring, the load direction changing member 30 is arranged in the direction in which the longitudinal direction of the wire rope 20 and the extending direction of the wire rope 20 are substantially orthogonal to each other in the vicinity of the opening on the slope ground surface of the extraction hole 22. A part or all of the earth pressure surface 30a of the conversion member 30 is embedded in the slope surface, and the load direction conversion member 30 is installed. A part of the wire rope 20 is fitted into the groove 31 so as to be substantially orthogonal to the longitudinal direction of the load direction changing member 30. Further, the holding plate 32 is inserted into the load direction changing member 30 from one end of the load direction changing member 30 and positioned between the wire rope 20 fitted in the concave groove 31 and the inner wall surface of the load direction changing member 30. The holding plate 32 is inserted until the locking portion 32a is locked to one end surface of the load direction changing member 30.

  After the wire rope 20 is laid along the load direction changing member 30, the other end of the wire rope 20 is connected to the support rope 41 of the rockfall prevention fence 4 via the turnbuckle 42 as shown in FIG. . At least the opening of the extraction hole 22 may be filled.

  With reference to FIGS. 10 to 13, the anchor device and its installation method of the second embodiment will be described. In the anchor device 1A of the second embodiment shown in FIG. 10, the anchor 10A is different from the anchor device 1 of the first embodiment described above in that a wire rope 20 is connected to substantially the center in the longitudinal direction.

  FIG. 11 shows a perspective view of the anchor. The anchor 10A is formed of an anchor body 11A having a length sufficiently larger than the diameter and a hollow inside. Two upper blades 12A and lower blades 13A are welded to the anchor main body 11A in a straight line or integrally with the upper portion (rear end portion) and the central portion (downward direction) of the anchor main body 11A, respectively. Is formed. The upper blades 12A are larger than the lower blades 13A, and the lower edges thereof are inclined upward as they move away from the anchor main body 11A so as to be easily driven into the topsoil layer G1.

  Rope hooks 26 are located at two positions (lower blade 13A at an angular interval of 180 ° on the peripheral surface of anchor body 11A, respectively, at a substantially central position in the longitudinal direction of anchor body 11A (a position slightly above lower blade 13). (Only one rope hook 26 appears in FIG. 11). The rope hook 26 (positioning portion) is a spiral winding of steel wire. Further, a rope guide 27 is provided on the peripheral surface of the anchor main body 11A at the same height position as the upper ends of the two lower blades 13 and at an intermediate angular position between the two lower blades 13A. A rope guide 28 is further provided at a lower position (tip portion) parallel to the longitudinal direction of the anchor body 11A from the rope guide 27. The rope guides 27 and 28 are two guide pieces integrally formed or welded to the peripheral surface of the anchor main body 11A so as to narrow the wire rope 20 from both sides.

  An installation method of the anchor device 1A of the second embodiment will be described below. Here, the description of the same operation as the anchor device 1 described above will be simplified or omitted, and different points will be mainly described.

  The guide hole 21A is drilled and the extraction hole 22A is drilled. After communicating the guide hole 21A and the lead-out hole 22A, one end of the wire rope 20 is pulled out from the upper end opening of the guide hole 21A to the slope S using a lead wire.

  As shown in FIG. 12, the anchor main body 11A is inserted into the ring at one end of the double wire rope 20 drawn out from the guide hole 21A to the slope S. The wire rope 20 is hung on a rope hook 26 to position the wire rope 20, and the wire rope 20 is bundled at a position above the rope guide 27 in a state where the wire rope 20 is applied to the peripheral surface of the anchor body 11A of the anchor 10A. Fasten with After the wire rope 20 is fastened with the fasteners 57, the wire rope 20 is fitted into the rope guides 27 and 28. The wire rope 20 is fixed to the rope guides 27 and 28 by sticking the tape 29 on the rope guides 27 and 28 into which the wire rope 20 is fitted.

  The anchor 10A is driven into the ground along the guide hole 21A. At this time, the surface of the upper blade 12A and the lower blade 13A is substantially perpendicular to the direction in which the wire rope 20 is stretched, and the portion to which the wire rope 20 is fastened (the portion of the fastener 57) attaches the anchor 10A. After driving in, the anchor 10A is arranged so as to look into the extraction hole 22A. When driving the anchor 10A, the wire rope 20 drawn out from the lead-out hole 22A is pulled. As a result, when the rope guides 27 and 28 reach the positions where the lead holes 22A are viewed, respectively, the tape 29 attached to the guides 27 and 28 is peeled or broken, and the wire rope 20 is detached from the rope guides 27 and 28. Therefore, when the anchor 10A is fixed in the slope ground, the wire rope 20 is pulled out from the substantially center position (positioning portion position) of the anchor 10A through the extraction hole 22A in the direction perpendicular to the longitudinal direction. It becomes.

  In FIG. 13, after anchor 10 </ b> A is fixed, load direction conversion member 30 is installed in the vicinity of the opening on the inclined surface of lead hole 22 </ b> A, and wire rope 20 is placed along concave groove 31 of load direction conversion member 30. The other end of the wire rope 20 is connected to the support rope 41 of the rockfall prevention fence 4 through the turnbuckle 42, and is tensioned.

  In the first embodiment and the second embodiment described above, the installation of the anchor device for supporting or reinforcing the rockfall prevention fence 4 and the installation method thereof have been described, but the anchor device is used for supporting the avalanche prevention fence. It can also be used, and can be used directly to prevent the fall of megaliths and rocks, to fix ropes stretched vertically and horizontally from the laid wire mesh, or for other uses.

  In the above embodiment, the anchors 1, 1A are provided with two upper and lower blades 12, 12A, 13, 13A. In such anchors with blades on the top and bottom, the rope positioning part should be provided between the center of the anchor in the longitudinal direction and the tip (in the range of about 2/3 of the anchor length). it can. This is because the presence of the blade can suppress the displacement of the anchor in the ground and the change in posture against the tension applied to the rope. In the case where there is a blade only at the upper part (rear end part), the positioning part is preferably provided excluding the tip of the anchor (the part corresponding to the diameter of the anchor from the tip). In the case of an anchor without a blade, it is preferable that the positioning portion is provided at the center portion of the anchor length (in the range of about 1/3 of the length of the anchor body with the center as the center). In the above embodiment, two blades are provided in a straight line, but it goes without saying that three or more blades may be provided radially around the anchor. Furthermore, in the above embodiment, the anchor is provided with a positioning portion so that the position of the rope hung on the anchor is not displaced. However, the anchor is provided with a connecting tool such as a hole or a ring, and a fastener (connecting portion). It may be provided.

1,1A Anchor device
10,10A Anchor
11, 11A Anchor bolt
12, 12A upper blade
13, 13A Lower blade
17 Positioning notch (positioning part)
18 Positioning rod (positioning part)
20 wire rope
26 Rope hook (positioning part)
30 Load direction change member

Claims (3)

An anchor is anchored in the ground, and one end of the rope is connected to the center of the anchor in the longitudinal direction or from the center to the tip.
The rope connected to the anchor passes through a lead-out hole drilled substantially perpendicularly to the longitudinal direction of the anchor from the ground surface away from the anchoring position of the anchor toward the rope connecting position of the anchor, Pulled almost perpendicular to the longitudinal direction of the anchor and pulled to the ground surface,
A load direction conversion member is disposed at a location where the rope is drawn to the ground surface so that the longitudinal direction is substantially perpendicular to the tension direction of the rope, and the rope is in contact with the load direction conversion member.
Anchor device. The anchor is formed with a positioning portion for preventing displacement of the rope hung on the anchor body at the center of the anchor body in the longitudinal direction or between the center and the tip. The anchor device according to claim 1, wherein a plurality of blades extending outward from the anchor body are provided along all or part of the longitudinal direction . The anchor is formed with a positioning portion for preventing displacement of the rope hung on the anchor body at the center of the anchor body in the longitudinal direction or between the center and the tip. The anchor device according to claim 1, wherein a plurality of blades extending outward are separately provided at the front end portion and the rear end portion .

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