JP2006194072A - High strength anchor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high strength anchor having a simple structure and an excellent construction property and capable of increasing strength and suppressing an amount of displacement greatly. <P>SOLUTION: This high strength anchor is provided with an anchor body and a cylindrical resistance body positioned below a head of the anchor body and pushed into the ground. The cylindrical resistance body has a sufficiently large diameter for the diameter of the anchor body and is provided with a top plate for allowing the anchor body to be inserted at an upper end. The head of the anchor body has a collar abutted on the top plate of the cylindrical resistance body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention mainly relates to a high strength anchor for fixing an intersection of ropes to the ground.

In facilities such as rockfall prevention and avalanche prevention, it is necessary to stretch the rope along the ground surface and fix the intersections and ends to the ground.
Pile bodies called soil anchors are widely used as fixing means for such rope intersections and ends. A rope is attached to the top, and the pulling force against the rope generated by falling rocks is anchored by the resistance of the pile.

  As the soil anchor, a so-called pipe anchor having a thin tip as shown in FIG. 17 has been generally used. However, the anchor receives a load from the upper side or the lower side, and further from the right or left direction. With respect to this condition, the pipe anchor has a large turning moment because the rotation center position A is at the lower end as shown in FIG. 17B. Therefore, the proof stress and displacement greatly vary depending on the soil, and the design proof strength does not come out. Will occur. Further, when the resistance force of the soil in front of the anchor becomes a limit, the displacement amount increases, and usually the resistance force reaches 17 to 40 kN and the displacement amount is 15 to 40 cm. Therefore, there is a problem that the proof stress is small and the displacement amount is large. .

Therefore, as a countermeasure, an earth pressure resistance plate made up of a plane single letter or a plane cross-shaped blade as shown in FIG. 18 is used in combination with a pipe anchor head.
However, the combination of single-letter or cross-shaped blade-type earth pressure resistance plates has a large variation in displacement due to the soil quality and soil volume because the resistance to earth pressure varies greatly depending on the direction of the blade during installation. However, there was a problem that a great improvement in yield strength and a reduction in displacement could not be expected. In addition, the resistance plate has a pipe at the center, and this is inserted into an anchor pipe and driven into the ground.

The present invention has been made in order to solve the above-mentioned problems, and its basic purpose is a practical structure capable of increasing the proof stress and greatly suppressing the displacement amount with a simple structure and having good workability. It is to provide a high strength anchor.
In addition, a second object of the present invention is to provide a high strength anchor capable of obtaining a high strength with tilt prevention.

  In order to achieve the above basic object, the high strength anchor of the present invention comprises an anchor main body and a cylindrical resistor positioned under the head of the anchor main body and pushed into the ground. Has a top plate that has a sufficiently large diameter with respect to the diameter of the anchor main body and allows the anchor main body to be inserted at the upper end, and a collar portion that contacts the top plate of the cylindrical resistor is provided on the head of the anchor main body. And a crossing portion of ropes and an accommodation chamber for a fastener are formed in the head. (Claim 1)

  In order to achieve the second object, a high-strength anchor of the present invention comprises an anchor body and a cylindrical resistor positioned under the head of the anchor body and pushed into the ground. Is provided with a top plate portion having a sufficiently large diameter with respect to the diameter of the anchor main body and allowing the anchor main body to be freely inserted at the upper end, and the collar head is in contact with the top plate portion of the cylindrical resistor. And the cylindrical resistor has a contact forming ring through which the anchor main body is inserted into the cylindrical portion. (Claim 3)

  According to the first aspect of the present invention, the resistor comprises a cylindrical resistor having a top plate portion, which is inserted through the collar portion provided on the head portion of the anchor body as a limit, and is driven by driving the anchor body. Since the driving force is transmitted from the part to the cylindrical resistor and pushed into the ground, the anchor and the resistor can be driven at a time, and the workability is good. In the driven state, the center position of the anchor's overturning behavior can be replaced from the lower end of the anchor to the ground (the ground), and the overturning moment acting on the anchor can be minimized.

Since the resistor is not a radial plate but a cylindrical shape, it has no directionality and can exhibit a good resistance action even if it receives an external force from any direction of 360 degrees. Therefore, it is less affected by the soil quality and the amount of soil, the proof stress is greatly increased, and the amount of displacement can be suppressed very small. After driving, the collar of the head of the anchor main body comes into contact with the top surface of the top of the cylindrical resistor, so that the cylindrical resistor and the anchor main body are not connected, but the horizontal direction It is possible to suppress the occurrence of inclination of the cylindrical resistor when a load is applied.

According to the invention of claim 3, since the cylindrical resistor has a contact forming ring for inserting the anchor main body into the cylindrical portion, the contact position between the anchor main body and the cylindrical resistor is shifted downward. As a result, the center position of the front earth pressure resistance and the position of the load action (contact point) are matched or close to each other, and the whole can be easily moved horizontally without being inclined, so that the stability of the proof stress can be improved.
In addition, since the ring functions as a guide when the anchor body is inserted into the cylindrical resistor and the anchor body is driven into the ground, the anchor body and the cylindrical resistor can be accurately and concentrically embedded.

Preferably, the cylindrical resistor has a centering guide for the anchor body in the cylindrical portion. According to this, since the cylindrical resistor and the anchor main body can be made concentric, even if an external force is applied from any direction of 360 degrees, a good resistance action can be exhibited.
In addition, it is easy to set on site for driving, and since accurate centering can be performed at the time of driving, construction can be performed easily.

Preferably, a crossing portion of the rope and an accommodation room for the fastener are formed in the anchor main body head, and rope leading grooves are provided at intervals of 90 degrees on the head wall.
A rope intersection and a fastener storage chamber are formed in the head of the anchor body, and the rope intersection and the fastener are housed in this storage chamber. Is led out from the rope lead-out groove formed in the head wall at intervals of 90 degrees to prevent the rope from shifting to the left and right, and the cap is attached to the head to close the storage chamber and Since the escape to the upper side is prevented, the rope can be made to approach the ground surface while firmly fixing the crossing of the rope, so that the falling moment of the cylindrical resistor against the load from the horizontal direction Can be minimized, and when applied to a rock fall prevention net or the like, the effect of suppressing floats is improved.

The cylindrical resistor has a diameter not less than 1.5 times the diameter of the anchor body, and the effective height H ₀ is H ₀ = horizontal load: T / (cylinder part diameter: D × side compression strength of soil: ± 20% of σ).
According to this, it is possible to make the size of the cylindrical resistor appropriate so that the anchor rotation center point is close to the ground level.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 shows an embodiment in which the present invention is applied to a soil anchor in a single state, and FIGS. 2 to 4 show a use state. 2 to 4, 1 is an anchor main body, 2 is a cylindrical resistor embedded in the ground from the vicinity of the head of the anchor main body 1, 3 is a cap attached to the head of the anchor main body 1, and R1 R2 is a crossed rope.

5 and 6 show the anchor main body 1 in a single state, which is made of a pipe material having a reduced diameter at the lower end, and is provided with a presser collar 1a on the head 1A near the upper end. The collar portion 1a is fixed to the pipe material by welding or the like.
A rope intersection accommodating chamber 11 is defined in the head wall, and thus four vertical grooves 10 for leading out the rope are formed in the head wall above the collar portion 1a at intervals of 90 degrees in the circumferential direction. Has been. And the fixing | fixed part 12 of the cap 3 is provided in the wall site | part which the vertical groove 10 does not exist. In this example, it is composed of a plurality of trapezoidal convex portions and is provided at equal intervals.

  The cylindrical resistor 2 is independent of the anchor main body 1, and a single state is shown in FIG. The cylindrical resistor 2 has a cylindrical portion 2a and a top plate portion 2b as a lid provided at the upper end of the cylindrical portion 2a. In this example, the cylindrical portion 2a has a circular cross section, has a size (diameter) sufficiently larger than the outer diameter of the anchor body 1, and cuts the soil when driven into the soil to facilitate burial. Therefore, a plurality of sharpened portions 20 are provided in the lower end region so as to form a sawtooth shape as a whole.

The top plate portion 2b is made of a rigid plate, has a planar rectangular shape in this embodiment, is disposed on the end surface of the tube portion 2a, and is integrated with the tube portion by welding a contact portion with the end surface. The top plate portion 2b has a hole 21 substantially equal to the diameter of the anchor main body 1 at the center, and a reinforcing portion made of a thick plate or the like is attached around the hole 21 as necessary.
A centering guide 22 that substantially coincides with the outer diameter of the anchor body 1 is provided in the cylindrical portion 2a for centering. In this example, a plurality of centripetal plates are arranged at intervals in the circumferential direction, and the proximal end side is welded to the inner surface of the cylindrical portion.

  The cap 3 has a top portion 3a that can be brought into contact with the upper end of the head of the anchor main body 1 and a cylindrical portion 3b that can be fitted to the head 1A. The cylindrical portion 3b is engaged with the fixing portion 12 of the cap 3. The fixing part 31 to be joined is arranged. In this example, it is configured as a trapezoidal convex part, and the fixing parts 12, 31 are brought into close contact with each other by fitting the cap 3 to the head 1 </ b> A so that the fixing part 31 is positioned between the fixing parts 12. The cap 3 is fixedly attached to the head 1A.

  2 to 4, reference numeral 4 denotes an intersection fastening fastener, which may have any configuration as long as it can fit into the rope intersection accommodating chamber 11 of the head 1 </ b> A of the anchor body 1. However, in this example, a member made up of a receiving metal fitting 4a and a pushing metal fitting 4b provided with a cross-shaped rope fitting groove on each inner surface and two sets of tightening screw elements 4c and 4c is used.

The receiving metal fitting 4a and the pressing metal fitting 4b are screwed through the screw elements 4c, 4c, for example, bolts, to the left and right sides of the rope fitting groove, or directly through the through holes and the bolts. A combination of female screw holes is provided. The intersection of the ropes R1 and R2 is fitted into the rope fitting groove of the receiving metal fitting 4a, and the screw metal parts 4c and 4c are rotated by covering the pressing metal piece 4b. It has become so.

9 (a) and 9 (b), the cylindrical resistor 2 has a horizontal load T, an effective height (distance from the upper end to the root of the sharpened portion) H _0, and the diameter of the cylindrical resistor 2 Is D and the side compression strength of the soil is σ, it is desirable that the relationship H ₀ = T / (D × σ) ± 20% is satisfied.
The diameter D of the cylindrical resistor is preferably about 2 to 10 times the diameter d of the anchor body 1. If D / d is less than 2, it is not appropriate because the area is small and the effect of preventing storefront is poor, and if D / d is 10 or more, it is not appropriate because it is difficult to drive into the soil.

As an example of the specification, when the diameter d of the anchor body 1 is 11.4 cm, the diameter D of the cylindrical resistor is about 29 cm. If the lateral compression strength σ of the soil is 2.5 kg / cm ² and the horizontal load T is 2500 kg under these conditions, the required effective height H ₀ of the cylindrical resistor may be 34.5 cm, and T is 3400 kg. In this case, H ₀ may be 48.3 cm.
Further, when the side compression strength σ of the soil is 3.0 kg / cm ² and the horizontal load T is 2500 kg under these conditions, the required effective height H ₀ of the cylindrical resistor is 28.7 cm, and T is 3500 kg. H ₀ may be 40.2 cm. Therefore, the overall height H of the cylindrical resistor may be about 40 to 50 cm.
The cylindrical resistor 2 can use a steel pipe as a material, and can respond to various loads only by adjusting the use length if the diameter is constant. In the embodiment, since the top plate portion is rectangular, the square steel plate may be processed and welded to the tube portion material, so that the manufacturing cost can be reduced.

  The required length of the anchor body 1 is shown in FIG. 9C, where the diameter of the anchor body is d, the total resistance of the soil acting on the anchor body is W, and the soil compressive stress generated at the lower end of the anchor body is q. When the length from the receiving / supporting portion to the upper end of the anchor body is a and the length from the receiving / lowering portion to the lower end is 1, W = (d · l · q) / 2, and T · a = W (2 From l / 3) to W = (3 · T · a) / (2 · l). From these equations, the following equation is obtained.

Assuming that a = 10 cm, d = 11.4 cm, T = 3500 kg, q = 1.0 kg / cm ² , l is 95.6 cm, and 130 to 150 cm is sufficient even if soil variation is taken into consideration. It is.

The operation of the first embodiment will be described. In construction, the anchor body 1 is carried into the site in a divided state, and the anchor main body 1 is inserted into the hole 21 of the cylindrical resistor 2. If it carries out like this, it will become like FIG.1 (b) and can be made to prepare stably at a construction site.
If the anchor main body 1 is faced at right angles to the target slope and driven into the ground by a striking means such as an air driving machine, the cylindrical resistor 2 has a centering guide 22 in the cylindrical portion. When guided by this, the anchor body 1 continues to be propelled into the soil, and when the collar portion 1a comes into contact with the upper surface of the top plate portion 2b of the cylindrical resistor 2, the striking force is transmitted to the cylindrical resistor 2, and the anchor At the same time as the main body 1 is propelled into the soil, the cylindrical portion 2a of the cylindrical resistor 2 is propelled into the ground while the resistance is reduced by the sharpened portion 20, and the top plate portion 2b is moved to the ground surface GL as shown in FIG. Embedded until close.
At this time, the anchor main body 1 passes through the hole 21 of the top plate portion 2b, and the centripetal alignment guide 22 guides the anchor main body 1 within the cylindrical portion 2a, so that the cylindrical resistor 2 does not tilt. It is embedded concentrically with the anchor body 1.
Therefore, driving workability is good, and a large number of anchors can be embedded quickly and efficiently in the planned location.

  In this state, since the accommodation chamber 11 of the head 1A of the anchor body 1 is opened, the vertical rope R1 and the horizontal rope R2 intersect between the receiving metal 4a and the pressing metal 4b of the cross-section tightening metal 4 in the vicinity. The bracket 4a and the clamp 4b are tightened with the screw elements 4c and 4c. As a result, an assembly that is tightened so that the crossing portion does not move is obtained, and is stored in the storage chamber 11, and the portions slightly ahead of the crossing portion of the vertical rope R1 and the horizontal rope R2 are respectively placed on the head 1A. In this state, the cylindrical portion 3b of the cap 3 is rotated while being fitted to the head 1A. As a result, the fixing parts 12 and 31 are brought into close contact with each other, the cap 3 is fixedly attached to the head 1A, and the rope intersection is fixed to the ground as shown in FIG.

The rope crossing portion and the cross portion fastening metal fitting 4 are stored in the head of the anchor body 1 and are covered with the cap 3, so that they do not pop out, and there is no fear of being damaged or damaged, and the appearance is also good. It will be a thing. Further, since it is not necessary to fix the intersecting portion tightening bracket 4 to the anchor main body 1 or the cap 3 with a connecting bolt or the like, the operation is very simple and the number of members used is small, which is economical.
Moreover, since the rope crossing portion and the cross portion fastening metal fitting 4 are stored in the head of the anchor body 1, the vertical rope R1 and the horizontal rope R2 are very close to the ground surface GL as shown in FIGS. Will be laid. For this reason, when applied to a rock fall prevention facility, it is possible to accurately prevent loosening and movement of floating stones.

When falling rocks occur in such a state, the load acts as a tensile force on the anchor via the vertical rope R1 and the horizontal rope R2. The direction varies depending on the falling rock occurrence position, such as upward or downward, right or left.
The anchor body 1 tends to be tilted in the direction in which the tensile force acts by this tensile load. However, in the present invention, the cylindrical resistor 2 exists in the ground near the upper end portion of the anchor body 1, and the resistance is increased. The wall exists in the entire range of 360 degrees around the axis of the anchor body 1.
For this reason, a resistance action is exerted against an external force from any direction, the rotation center point is not near the lower end of the anchor body but near the ground surface, and the overturning moment acting on the anchor can be minimized.

When a tensile force is applied to the anchor main body 1, it is not appropriate that the cylindrical resistor 2 is not concentric with the axis of the tilt anchor main body 1. In the present invention, the cylindrical portion 2 a of the cylindrical resistor 2 has the alignment guide 22, which is close to the outer periphery of the anchor body 1, so that deviation is suppressed. In addition, the collar portion 1a of the anchor body 1 overlaps the top plate portion 2b of the cylindrical resistor 2 to prevent the upward tilt of the cylindrical resistor 2, and the bottom surface of the top plate portion is in contact with the surface soil and resists the tilt. Work as.
Therefore, the movement which the cylindrical resistor 2 inclines and tries to float up is prevented, Therefore, the pulling-out resistance force by the frictional force of the anchor main body 1 and soil is larger than the upward load which acts on the cylindrical resistor 2 As long as the cylindrical resistor 2 is coaxial with the axis of the anchor body 1, that is, remains horizontal with respect to the slope, it does not tilt. For this reason, the anchor has a high yield strength, and the amount of displacement is minimized, and a high yield strength with a load of 1.5 times or more and a displacement amount of 0.3 times or less is obtained with respect to a conventional underground anchor.

Experiments to confirm the effect of the present invention were conducted with a model created on a scale of 1/10 of the actual product. The anchor body has a diameter of 12 mm and an effective length l: 150 mm. As a conventional type, a single letter blade having a total height of 60 mm, an effective height of 40 mm, and a plate thickness of 2.5 mm is welded to the side surface of the anchor body. For the anchor of the present invention, a cylindrical resistor having an overall height of 60 mm, an effective height of 40 mm, a plate thickness of 2.5 mm, and a diameter of 29 mm was used.
In the experiment, as shown in FIG. 10, soil was put in a container, an anchor was embedded, a wire was connected to the head, it was pulled through a spring balance, and a load and a displacement amount were measured.
The result is shown in FIG. As is apparent from this figure, the anchor of the present invention has a displacement of only 2 mm at a load of 18 kg, and is significantly different from a conventional product having a displacement of 20 mm at a load of 14 kg.

Based on the above results, an anchor for a design load of 24 kN was created, actually constructed on the slope, and the proof stress was measured.
The anchor body has a diameter of 12 cm and an effective length of 150 cm, the cylindrical resistor is made of steel, the cylinder part has a diameter of 290 mm, the total height is 400 mm, the plate thickness is 2 mm, and the top plate has a 280 mm square and a thickness of 3.2 mm. This was welded to the cylinder part.
This cylindrical resistor is driven at an angle of 20 degrees on the soil: gravel slope, and a wire rope is hung on the top of the anchor body protruding from the cylindrical resistor, and the wire rope is pulled through a spring balance. The load / displacement was measured.

The result is shown in FIG. The standard proof stress of the pipe anchor is assumed to be a load of 1700 kg. As is clear from this figure, the anchor of the present invention has a displacement of only 10 mm, and it was 23 mm even at a load of 2400 kg. Therefore, as a result of continuing the experiment, the displacement amount was 44 mm even under a large load of 3000 kg, and an extremely large proof stress and a small displacement value were obtained. This is obviously due to the function of the cylindrical resistor.

13 to 16 show a second embodiment of the present invention.
In this embodiment, the hole 21 in the top plate portion 2b of the cylindrical portion 2a of the cylindrical resistor 2 is made significantly larger than the outer diameter of the anchor body 1, while the required portion in the height direction, usually the total height H is high. A plurality of ribs 23 project from the cylindrical wall in a centripetal manner at a position lower than the 1/2 position (H2 ≦ H1), and an inner diameter that is appropriately larger than the outer diameter of the anchor body 1 at the ends of the ribs 23 The ring 24 is joined. The center of the ring 24 coincides with the center of the cylindrical portion 2 a of the cylindrical resistor 2. The “ring” includes the concept of a short cylinder.
Since the other configuration is the same as that of the first embodiment, the description will be used, and the same reference numerals are given to the same parts and portions.

Also in this second embodiment, when the anchor body 1 is driven into the ground with the target slope facing, the cylindrical resistor 2 has the ring 24 in the cylindrical portion. The main body 1 continues to be propelled into the soil, and when the collar portion 1a comes into contact with the top surface of the top plate portion 2b of the cylindrical resistor 2, the anchor main body 1 is propelled into the soil integrally with the cylindrical resistor 2, and the top It is embedded until the plate portion 2b comes close to the ground surface GL.
Even if the anchor main body 1 loosely inserts the hole 21 of the top plate portion 2b, the ring 24 in the cylindrical portion 2a accurately guides the anchor main body 1, so that the cylindrical resistor 2 does not tilt and is concentric with the anchor main body 1. Buried in Therefore, driving workability is good.

After driving in, the rope is connected to the head of the anchor main body in the same manner as in the first embodiment, or the rope crossing portion and the cross portion tightening metal fitting 4 are stored in the head of the anchor main body 1. When the load acts as a tensile force on the anchor, the anchor body 1 tends to be tilted in the direction in which the tensile force acts. In the present invention, the cylindrical portion 2a of the cylindrical resistor 2 has the ring 24. Since the anchor body 1 is inserted therethrough, as shown in FIG. 16, the contact position is shifted to a position below the ground surface, and the front earth pressure resistance center position and the load application position are matched or close to each other. For this reason, the movement which the cylindrical resistor 2 inclines and tries to float up is blocked | prevented, and the cylindrical resistor 2 keeps coaxial, ie, horizontal, with the axial center of the anchor main body 1, and does not incline. For this reason, proof stress is high as an anchor, and the amount of displacement becomes the minimum.
In the first embodiment, since the guide 22 is a centripetal plate that projects into the cylindrical portion, there is a possibility that a concentrated load may be generated because the contact point is linear. However, since the present invention is cylindrical, the anchor body A good contact point can be constructed without damaging 1.
As a result of conducting the same experiment as in Example 1 by the present inventors, it was confirmed that a good result of 20 mm was obtained even when the displacement was 7 mm at a load of 1700 kg and a load of 2400 kg.

What is shown is a few examples of embodiments of the present invention and is not limited thereto.
1) In the present invention, the cylindrical portion 2a of the cylindrical resistor may have a square cross section instead of a circular cross section.
2) The top plate portion 2b is not a plane square, but may be a circle as in the second embodiment. Further, it may be configured in a cup shape having an enclosing wall, and this may be covered with a cylinder portion and coupled with a rivet or a screw. In those cases, it is preferable to provide a plurality of air vent holes on the plate surface. Furthermore, the top plate portion 2b and the tube portion 2a may be integrally formed by deep drawing or the like.
3) The anchor body 1 may be a solid structure such as a steel bar instead of a pipe.
4) The cap 3 may be an internal fitting type instead of an external fitting type.
Moreover, the cap 3 is good also as a form which protruded the volt | bolt for connecting a part of 2 split holding metal clamp | tightened on both sides of a rope. In this case, the longitudinal grooves 10 and 10 of the head 1A are unnecessary.

  The present invention can be used as a soil covering anchor as well as a soil anchor.

(A) (b) is a perspective view which shows 1st Example of the anchor of this invention. It is a vertical side view which shows the use condition of 1st Example. FIG. 3 is a plan view in which the cap of FIG. 2 is omitted. FIG. 3 is a partially enlarged side view of FIG. 2. (A) is the front view of the upper half part of an anchor main body, (b) is the elements on larger scale. It is an enlarged plan view of an anchor main body. (A) is a partially cutaway front view of a cylindrical resistor, (b) is a plan view, and (c) is a bottom view. (A) is a partially cutaway front view of a cap, and (b) is a bottom view. (a), (b) is explanatory drawing which shows the relationship between a cylindrical resistor and a load, (c) is explanatory drawing which shows the relationship between the force which acts on an anchor main body and this. It is explanatory drawing of the performance experiment apparatus of this invention anchor. It is a diagram which shows the measurement result (load and displacement amount) in the experiment using the apparatus of FIG. It is a load and displacement diagram which shows the implementation result of this invention anchor. It is a vertical side view which shows 2nd Example of this invention. It is sectional drawing which follows the AA line of FIG. It is a perspective view of the cylindrical resistor of 2nd Example. (A) is explanatory drawing of the load of 2nd Example, (b) is explanatory drawing which shows the correlation of a load and resistance force. (a) is a use state figure of the conventional pipe anchor, (b) is explanatory drawing which shows a yield strength and a displacement amount. (a) is a top view of the underground anchor which used the conventional blade-type resistance board together, (b) is a longitudinal cross-sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Anchor main body 1A Head 1a Collar part 2 Cylindrical resistor 2a Cylinder part 2b Top plate part 3 Cap 10 Split groove 11 Storage chamber 21 Hole part 22 Centering guide 24 Ring

Claims (5)

  An anchor body and a cylindrical resistor which is positioned below the head of the anchor body and is pushed into the ground. The cylindrical resistor has a sufficiently large diameter with respect to the diameter of the anchor body and has an upper end. A high-strength anchor characterized by comprising a top plate portion that allows insertion of the anchor body, and having a collar portion in contact with the top plate portion of the cylindrical resistor at the head portion of the anchor body.   The high resistance anchor according to claim 1, wherein the cylindrical resistor has a centering guide for the anchor body in the cylindrical portion.   An anchor body, and a cylindrical resistor positioned below the anchor body and pushed into the ground, the cylindrical resistor having a sufficiently large diameter relative to the diameter of the anchor body A top plate portion that allows the anchor body to be freely inserted is provided at the upper end, the head portion of the anchor body has a collar portion that abuts the top plate portion of the cylindrical resistor, and the cylindrical resistor body is in the cylindrical portion. A high-strength anchor characterized by having a ring for contact formation through which the anchor body is inserted.   The rope crossing portion and the fastener receiving chamber are formed in the anchor main body head, and rope leading grooves are provided at intervals of 90 degrees on the head wall. The high strength anchor described. The cylindrical resistor has a diameter of 1.5 times or more the diameter of the anchor body, and the effective height H ₀ is horizontal load: T / (cylinder part diameter: D × side surface compression resistance: σ). The high yield strength anchor according to any one of claims 1 to 4, which is ± 20%.

Images