JP2011190642A - Anchor - Google Patents

Abstract

[PROBLEMS] To make it difficult to escape after embedding.
An anchor body 10 extending in one direction and a retaining member 20 provided at a distal end portion 11 of the anchor body 10 and providing pulling resistance to the anchor body 10 when the anchor body 10 is embedded are provided. The retaining member 20 is inclined in such a direction that a base portion 21 provided at the distal end portion 11 extends from the base portion 21 toward the opposite side of the distal end portion 11 and the separation distance from the anchor body 10 increases toward the rear. And a plurality of retaining pieces 22 arranged in the circumferential direction of the anchor main body 10, and the retaining member 20 is formed by the resistance that each retaining piece 22 receives from the ground when a pulling force is applied to the anchor main body 10. The retaining pieces 22 can be deformed in a direction in which the inclination angle θ with respect to the anchor main body 10 is enlarged, and the retaining pieces 22 adjacent to each other are also the same. There by contact with the circumferential direction, the inclination angle theta is set to the lowest angle theta _0.
[Selection] Figure 1

Description

  The present invention relates to an anchor for fixing, for example, a rockfall prevention net used for preventing rockfall, and more particularly to an anchor embedded in soil while being driven to rotate.

  As the above-described anchor, there is conventionally known an anchor having a structure in which an anti-rotation member that also serves as a mooring is attached to an upper portion of an anchor main body in which a band plate is formed in a spiral shape (for example, see Patent Document 1). In this anchor, the anchor body is embedded in the ground while being rotated with the anti-rotation member removed. When the anchor body reaches a predetermined depth, the anti-rotation member is attached to the upper part of the anchor body to rotate around the anchor body. A stop is made.

Japanese Patent No. 3111252

  However, in the above-described conventional anchor, there is no portion protruding outward from the spiral anchor body. Therefore, after embedding such an anchor body in the ground, the direction opposite to the embedding direction is provided. There is a problem that it is easy to pull out when a pulling force that is pulled up toward the head acts.

  The present invention has been made to solve such problems of the prior art, and an object of the present invention is to provide an anchor that is difficult to come out even if a pulling force acts after being embedded.

  An anchor according to claim 1 of the present invention is an anchor that is embedded in the ground while being driven to rotate, and extends in one direction, and an anchor body that constitutes a tip portion in which one end thereof is embedded in advance, A retaining member that is provided at a distal end portion of the anchor body, and that pulls out into the ground in a state where the anchor body is embedded to provide a pulling resistance to the anchor body, and the retaining member is a distal end of the anchor body. A base portion provided in the vicinity of the portion, and an inclination extending from the base portion toward the opposite side of the distal end portion of the anchor main body and a distance from the anchor main body increasing toward the rear. A plurality of retaining pieces arranged in the circumferential direction of the main body, and the retaining members are provided when a pulling force is applied to the anchor body. The retaining piece can be deformed in a direction in which the inclination angle of the retaining piece with respect to the anchor main body is increased by the resistance received from the ground, and the retaining pieces adjacent to each other are in contact with each other in the circumferential direction. It has a shape that prevents the inclination angle from decreasing until it falls below a predetermined minimum angle.

  An anchor according to claim 2 of the present invention is the anchor according to claim 1, wherein the minimum angle is 5 ° or more and 30 ° or less.

  The anchor according to claim 3 of the present invention is the anchor according to claim 1 or 2, wherein each of the retaining pieces has a flat plate shape, and the retaining members are arranged so that side surfaces of the retaining pieces adjacent to each other are in contact with each other. It has the shape which can contact | connect.

  The anchor according to claim 4 of the present invention is the anchor according to claim 3, wherein the retaining member base and each retaining piece are formed of a single metal plate, the retaining piece, the anchor body, The boundary portion between the base and each retaining piece is bent so that the angle formed by the angle is equal to or greater than the minimum angle.

  In the anchor according to the present invention, the plurality of retaining members of the retaining member provided at the distal end portion of the anchor body are inclined so as to increase the separation distance from the anchor body toward the rear end side of the anchor body. is doing. Therefore, if the anchor body receives a pulling force after it is buried in the ground from the tip side of the anchor body, the resistance that each retaining piece receives from the ground deforms so that the inclination angle of the retaining piece with respect to the anchor body increases. As a result of this deformation, a resistance is generated that makes it difficult to escape from the ground. This resistance makes it difficult for the anchor to come off. In addition, when embedded in the ground, even if the inclination angle of the retaining piece with respect to the anchor body decreases, the adjacent retaining piece abuts in the circumferential direction and decreases until the inclination angle falls below the minimum angle. Therefore, the inclination angle of the retaining piece with respect to the anchor main body is maintained at a minimum angle or more, and is embedded in the ground in the retained state. Therefore, when the anchor main body receives the pulling force, the anchor main body receives the pulling force by setting the minimum angle so as to be deformed in a direction in which the inclination angle expands due to the resistance that each retaining piece receives from the ground. Each retaining piece can surely open the tip side opposite to the base. In a state where no load is applied to the retaining pieces, the adjacent retaining pieces do not contact in the circumferential direction, and the inclination angle is set to be larger than the minimum angle, and when embedding, It is also possible to employ a configuration in which adjacent retaining pieces abut on the circumferential direction and the inclination angle is reduced to the minimum angle.

  The minimum angle is preferably 5 ° or more and 30 ° or less as described in claim 2. That is, when the angle is less than 5 °, there is a possibility that each retaining piece will not be deformed in the direction of increasing the inclination angle even when the anchor body is pulled out due to the pulling force acting on the anchor body. It is. On the other hand, when the angle is larger than 30 °, it is difficult to embed the anchor.

  Further, in the anchor according to claim 3, each retaining piece has a flat plate shape, and the side surfaces of the retaining pieces adjacent to each other are in contact with each other, so that the contact portions between the side surfaces are corner portions. And the corners have the effect of making holes in the ground. At this time, it is preferable to form an abutting piece that abuts against the side surface of the counterpart retaining piece on at least one side surface of the retaining pieces adjacent to each other where the side surfaces abut each other.

  Furthermore, in the anchor according to claim 4, since the base and the retaining piece are made of a single metal plate, the number of parts can be reduced. Moreover, since the base and the retaining piece are integrally connected, it is possible to ensure the strength at the boundary between the base and the retaining piece.

It is a front view showing an anchor concerning one embodiment of the present invention. It is a right view which shows the anchor of FIG. It is a figure which shows the state which uses the anchor of FIG. It is a front view which shows the anchor main body which comprises the anchor of FIG. It is an external appearance perspective view which shows the retaining member which comprises the anchor of FIG. FIG. 6 is a development view of the retaining member shown in FIG. 5. It is action | operation explanatory drawing of the retaining piece in a retaining member. (A), (b) is an external appearance perspective view which shows another retaining member. (A) is an external appearance perspective view which shows the other retaining member, (b) is the expanded view. It is an external appearance perspective view which shows the other retaining member. It is an external appearance perspective view which shows another rotation stop member. Furthermore, it is a figure which shows another rotation prevention member, (a) is a top view, (b) is a front view. Furthermore, it is a figure which shows another rotation prevention member, (a) is a top view, (b) is a front view.

  Embodiments of the present invention will be specifically described below.

  FIG. 1 is a front view showing an anchor according to an embodiment of the present invention, FIG. 2 is a right side view showing the anchor, and FIG. 3 is a view showing a state in which the anchor is used. 4 is a front view showing an anchor main body constituting the anchor, FIG. 5 is an external perspective view showing a retaining member constituting the anchor, and FIG. 6 is a development view of the retaining member shown in FIG.

  The anchor 1 is embedded in the ground while being driven to rotate, and has an anchor body 10, a retaining member 20, and a rotation preventing member 30.

  As shown in FIG. 4, the anchor body 10 is a rod-shaped member extending in one direction, and one end portion 11 of the anchor body 10 constitutes a tip portion that is embedded in the ground in advance. The front end portion (one end portion) 11 is attached with a conical portion 12 formed in a conical shape so as to become sharper toward the front end, and a retaining member 20 formed on the rear end side of the conical portion 12. And a retaining member attaching portion 13 for retaining the retaining member. A stepped portion 14 having an outer diameter continuously larger than the retaining member mounting portion 13 is formed on the rear end side of the retaining member mounting portion 13. A shaft portion 15 is formed on the rear end side of the stepped portion 14, and the shaft portion 15 has the same outer diameter at each position in the axial direction. A stepped portion 16 whose outer diameter is continuously smaller than that of the shaft portion 15 is formed on the rear end side of the shaft portion 15, and the rear end side of the stepped portion 16 is smaller in outer diameter than the shaft portion 15. The anti-rotation member attaching portion 17 is formed. Male screws are formed on the retaining member attaching portion 13 and the rotation preventing member attaching portion 17.

  A retaining member 20 is attached to the retaining member mounting portion 13. The retaining member 20 is a metal member that gives out resistance to the anchor body 10 by biting into the ground in a state where the anchor body 10 is embedded. As shown in FIG. 5, the shape of the retaining member 20 includes a rectangular base portion 21 having a circular mounting hole 21 a at the center portion and four retaining pieces 22 connected to each side of the base portion 21. A portion where the base 21 and each retaining piece 22 are connected is a bent portion.

  The retaining member 20 is manufactured as follows. First, as shown in FIG. 6, a single metal plate, for example, a steel plate, is die-cut as shown in FIG. 6, and the boundary portion 24 between the base portion 21 and the retaining piece 22 is bent in the same direction. The Therefore, since the base 21 and the retaining piece 22 are made of a single metal plate, the number of parts can be reduced. Further, since the base portion 21 and the retaining piece 22 are integrally connected, it is possible to ensure the strength at the boundary portion 24 as compared with the case where the base portion 21 and the retaining piece 22 are connected by welding or the like.

  As shown in FIGS. 1 and 2, the retaining member 20 is inserted into the mounting hole 21 a of the base portion 21 with the distal end portion 11 of the anchor main body 10 and held between nuts 23 a and 23 b provided on both sides of the base portion 21. By doing so, it is attached to the tip 11 of the anchor body 10. In this attached state, each retaining piece 22 extends from the base portion 21 toward the opposite side of the distal end portion 11 of the anchor main body 10 and is inclined in a direction in which the separation distance from the anchor main body 10 increases toward the rear. Are arranged in the circumferential direction of the anchor body 10.

The retaining member 20 is deformed in such a direction that the inclination angle θ of the retaining piece 22 with respect to the anchor body 10 increases due to the resistance that each retaining piece 22 receives from the ground when a pulling force is applied to the anchor body 10. The retaining pieces 22 that are possible and are adjacent to each other are in contact with each other in the circumferential direction. Of the inclination angles θ, the minimum angle θ ₀ when adjacent retaining pieces 22 abut on each other in the circumferential direction is set to 10 ° in the present embodiment.

  The anti-rotation member 30 is attached to the anti-rotation member attachment portion 17. The anti-rotation member 30 is made of metal formed in an approximately L shape, and has a strip-shaped attachment portion 31 and an embedded portion 32 connected to one end in the longitudinal direction of the attachment portion 31. For example, a circular attachment hole 31 a is formed in the attachment portion 31, and a driving portion 32 a that becomes narrower toward the distal end is formed on the distal end side (the side away from the attachment portion 31) of the embedded portion 32. Has been.

  In this anti-rotation member 30, after the anchor main body 10 is buried at a predetermined depth, the mesh 2a of the rock fall prevention net 2 or the rope 3 for pressing the rock fall prevention net 2 is inserted between the anchor main body 10 and the buried portion 32. (See FIG. 3), the anti-rotation member 30 is driven in a state in which the anti-rotation member attachment portion 17 is inserted into the attachment hole 31a, and the mesh of the rock fall prevention net 2 is between the anchor main body 10 and the embedded portion 32 in the attachment portion 31. 2a and rope 3 are secured. Note that both sides of the attachment portion 31 are sandwiched between nuts 33a and 33b.

  Next, the attachment contents of the anchor 1 in the present embodiment configured as described above will be described by taking as an example the case of fixing a rockfall prevention net.

  First, the retaining member 20 is attached to the retaining member attaching portion 13 at the distal end portion 11 of the anchor body 10 via the nuts 23a and 23b. Alternatively, the anchor main body 10 to which the retaining member 20 is attached is prepared.

Next, the anchor main body 10 is driven to rotate inside the mesh 2a of the rockfall prevention net 2 using a predetermined rotary tool, and the retaining member 20 is embedded in the ground. At this time, the retaining piece 22 is held in a fixed posture. That is because the stop piece 22 between spots adjacent to each other are in contact with the circumferential direction of the anchor body 10, the inclination angle theta is held at a minimum angle theta _0. Moreover, since the side surface 22a which contact | abuts in the adjacent retaining piece 22 protrudes outward rather than the other part in the circumferential direction, it functions as a kind of drill blade. Therefore, the retaining member 20 and the anchor body 10 are easily embedded in the ground.

  Next, when the anchor body 10 is embedded to a predetermined depth, the rotating tool is removed from the anchor body 10.

  Subsequently, the anti-rotation member 30 in a state in which the anti-rotation member attaching portion 17 is inserted into the attachment hole 31a so that the mesh of the rock fall prevention net enters between the anchor main body 10 and the embedded portion 32 (see FIG. 3). Use a hammer or the like to drive in. Thereby, the fall of the falling rock prevention net is prevented between the anchor main body 10 and the embedded portion 32 in the attachment portion 31. At this time, the nut 33 a below the attachment portion 31 is attached to the rotation prevention member attachment portion 17 before the rotation prevention member 30.

  Next, the nut 33 b above the attachment portion 31 is attached to the rear end portion 18 of the anchor body 10. Thereby, the attachment of the anchor 1 is completed.

The attachment of the anchor 1 is repeated, and the entire area of the rockfall prevention net is fixed to the ground by the anchor 1. With rockfall prevention network is attached to a desired state by this, the inclination angle theta of the locking piece 22 omission is kept constant at a minimum angle theta _0.

In this state, for example, even when a force is applied to the rock fall prevention net due to falling rocks and a pulling force acts on the attachment portion 31 and the anchor main body 10 of the anti-rotation member 30, the anchor main body 10 is prevented from being pulled out. However, it is prevented as follows. That is, as shown in FIG. 7, when the anchor main body 10 receives the pulling force A, each retaining piece 22 is deformed in a direction in which the inclination angle θ increases as shown by a two-dot chain line due to the resistance received from the ground (that is, the slipping-off piece 22 is removed) The stopper piece 22 is opened), and a resistance that makes it difficult for the ground to come off is generated with this deformation, and the anchor 1 becomes difficult to come off due to this resistance. At this time, since the inclination angle θ is set to the minimum angle θ ₀ , when the anchor body 10 receives the pulling force, the distal end side of each retaining piece 22 opposite to the base portion 21 can be reliably opened. .

In the above-described embodiment, the minimum angle θ ₀ is set to 10 °. However, the present invention is not limited to this, and the minimum angle θ ₀ is set to an arbitrary angle of 5 ° or more and 30 ° or less. It is possible. The reason why the minimum angle θ ₀ is set to 5 ° or more is that when the angle is less than 5 °, each retaining piece 22 does not move even when the anchor body is pulled out due to the pulling force acting on the anchor body. This is because there is a possibility that the tilt angle will not be deformed (that is, the retaining piece 22 will not open). On the other hand, the reason for setting the minimum angle θ ₀ to 30 ° or less is that if it is larger than 30 °, it becomes difficult to embed the anchor, or the mesh is inserted when the anchor is used for fixing the rockfall prevention net. This is because there is a possibility that it will not be possible.

  In the above-described embodiment, the base 21 is rectangular and the retaining pieces 22 are four retaining members 20. However, the present invention is not limited to this. For example, as shown in FIG. 8A, the base 211 is hexagonal and the retaining pieces 221 are six retaining members 201, or although not shown, the base is pentagonal and has five retaining pieces, or the base. May be a heptagon or more and the retaining pieces have the same number of retaining members as the number of sides of the base. Alternatively, the retaining member 202 having a shape in which the base 212 is circular and the retaining piece 222 is formed by dividing the side surface of the truncated cone into four parts may be used. As the retaining piece 222 in the retaining member 202, the side surface of the truncated cone may be divided into two parts, three parts, or five parts or more.

Furthermore, in the above-described embodiment, the minimum angle θ ₀ is maintained by bringing the side surfaces 22a of the adjacent retaining pieces 22 into contact with each other. However, the present invention is not limited to this, and FIG. As shown in (a) and (b), a contact piece 22b is formed on the side surface 22a of the adjacent retaining piece 22 so that the contact piece 22b and the side surface 22a of the adjacent retaining piece 22 come into contact with each other. It may be configured. In FIG. 9, the contact piece 22b is formed on both of the two side surfaces 22a to be contacted. However, the present invention is not limited to this, and the contact piece 22b may be formed on either one.

Furthermore, as the retaining member in the above-described embodiment, immediately before and after embedding in the ground (except when the pulling force acts to open the retaining piece 22), shown in FIGS. 5 and 9A. As described above, the side surfaces 22a of the retaining pieces 22 adjacent to each other are in contact with each other, that is, a configuration in which the inclination angle θ of the retaining pieces 22 does not change is taken as an example. The stop member is not limited to this. For example, as shown in FIG. 10, immediately before and after embedding in the ground (except when the pull-out force acts to open the retaining piece 22), the side surfaces 22a of adjacent retaining pieces 22 abut against each other. When the gap retaining member 20 is embedded in the ground, and the retaining member 20 is embedded in the ground, the inclination angle θ decreases as the retaining piece 22 is deformed by the force received from the ground. gap 22c is zero, i.e. it is possible to side 22a to each other is applied to a structure to deform to the lowest angle theta ₀ abutting the.

  Furthermore, as the anti-rotation member 30 in the above-described embodiment, a substantially L-shaped member is used as shown in FIG. 1, but the present invention is not limited to this. For example, as shown in FIG. 11, an anti-rotation member 30 </ b> A in which embedded portions 32 are provided at both ends in the longitudinal direction of the mounting portion 31 and a driving portion 32 a is formed at the tip of each embedded portion 32 may be used. Alternatively, as shown in FIG. 12, the attachment portion 34 is formed in a substantially triangular shape in plan view, the attachment hole 34 a is formed in the center portion, and an embedded portion 32 is provided at each apex of the outer peripheral portion. An anti-rotation member 30B having a driving portion 32a formed at the tip, or as shown in FIG. 13, the attachment portion 35 is formed in a cross shape in a plan view, and an attachment hole 35a is formed in the intersecting portion. An anti-rotation member 30 </ b> C in which an embedded portion 32 is provided at the end and a driving portion 32 a is formed at the tip of each embedded portion 32 may be used.

  Furthermore, in the above-described embodiment, the case where the falling rock prevention net is fixed is taken as an example, but the present invention is not limited to this. For example, the present invention can be similarly applied to an anchor for fixing a rope for pulling a support column when a tent is set up.

1 Anchor 10 Anchor body 11 One end (tip)
20 Retaining member 21 Base 22 Retaining piece θ Inclination angle θ ₀ Minimum angle

Claims (4)

An anchor embedded in the ground while being driven to rotate,
An anchor body that extends in one direction and constitutes a tip portion in which one end portion is embedded in advance;
Provided at the distal end of the anchor body, and provided with a retaining member that gives pull resistance to the anchor body by biting into the ground in a state where the anchor body is embedded,
The retaining member includes a base provided in the vicinity of the tip of the anchor body, a distance extending from the base toward the opposite side of the tip of the anchor body, and a distance from the anchor body toward the rear. And a plurality of retaining pieces that are inclined in the direction of expansion and are aligned with each other in the circumferential direction of the anchor body,
The retaining member is deformable in a direction in which an inclination angle of the retaining piece with respect to the anchor body is increased by a resistance that each retaining piece receives from the ground when a pulling force is applied to the anchor body, and An anchor having a shape which prevents the inclination angle from decreasing until it falls below a predetermined minimum angle when the retaining pieces adjacent to each other contact each other in the circumferential direction. The anchor according to claim 1,
An anchor characterized in that the minimum angle is not less than 5 ° and not more than 30 °. The anchor according to claim 1 or 2,
Each of the retaining pieces has a flat plate shape, and the retaining member has a shape in which side surfaces of the retaining pieces adjacent to each other can come into contact with each other. The anchor according to claim 3,
The base of the retaining member and each retaining piece are made of a single metal plate, and the base and each retaining piece are configured such that the angle formed between the retaining member and the anchor body is equal to or greater than the minimum angle. An anchor characterized in that the boundary portion between and is bent.

Images