JP2008255634A - Earth-retaining sleeve pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably support a rope and the like which are provided in a tensioned state so as to prevent a rock fall, an earth-flow disaster, etc. <P>SOLUTION: This earth-retaining sleeve pipe comprises: an outer pipe 31 with a square cross section, which is used to be driven into ground 100; a top board 32 which is joined to the outer pipe 31 so as to close an upper end-side opening of the outer pipe 31, and in which a through-hole 32a is formed; an inner pipe 33 with a square cross section, which is arranged inside the outer pipe 31, so as to be driven into the ground 100; and connecting materials 34 which are juxtaposed in the circumferential direction of the inner and outer pipes 33 and 31 so as to connect a lower end portion of the outer pipe 31 and the inner pipe 33 together. The outer pipe 31 is driven into the ground 100 while the inner pipe 33 and the connecting material 34 bite into the ground 10, so as to support a member 20 for supporting the rope and the like, which are provided in a tensioned state in the ground 100. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an anchor sheath tube for supporting an anchor main body driven into the ground.

  2. Description of the Related Art Conventionally, as a retaining structure for preventing a rock fall and earth and sand disaster, an anchor is driven into the ground and a rope or a net is stretched over the head of the anchor. In this structure, the anchor supports the rope, and the rope is prevented from being displaced from a predetermined position by an external force generated by falling rocks or the like.

  As the anchor, for example, Patent Document 1 includes a substantially columnar anchor main body on which the rope is stretched, and an anchor sheath tube that surrounds the anchor main body and supports the anchor main body from the side thereof. An anchor is disclosed. In the anchor, the anchor sheath tube is provided on the inner side of the outer tube having a circular cross section, a top plate portion provided on the upper end portion of the outer tube and having a square cross section, and the outer tube. And a circular ring for guiding the anchor body.

In this anchor, the anchor main body is inserted into a through hole formed in the top plate portion and the ring, and is driven into the ground while being guided by the ring.
JP 2006-140772 A

  Here, in order for the anchor sheath tube to stably support the anchor body, a sufficient contact area between the outer tube of the anchor sheath tube and earth and sand is secured, and the earth and sand acting on the outer tube It is necessary to ensure the resistance force. In order to increase this resistance, it is effective to increase the contact area between the outer pipe and earth and sand. However, in the anchor sheath tube described in Patent Document 1, if the diameter of the outer tube which is the cylinder is increased in order to increase the contact area between the outer tube and earth and sand, the entire anchor sheath tube becomes bulky. There is a problem that the transportation cost of the anchor sheath tube increases.

  Further, as a means for increasing the supporting force of the anchor main body, a gap is secured between the anchor main body and the ring, and sand and the like are interposed in the gap to enhance the biting of the anchor sheath tube into the ground. Is also effective. However, in the anchor sheath tube described in Patent Document 1, when the gap between the outer peripheral surface of the columnar anchor body and the inner peripheral surface of the ring, which is the circular inner tube, is increased, the ring becomes the anchor main body. However, the ring cannot be contacted over the entire circumference, and the ring cannot support the anchor body from the side.

  In view of such circumstances, it is an object of the present invention to provide an anchor sheath tube that can more stably support an anchor main body without increasing the conveyance cost.

  In order to solve the above-mentioned problem, the present invention provides a cylindrical anchor body in which an external force in a direction substantially parallel to the ground is applied to the head until the head protrudes a predetermined amount from the ground. An outer sheath tube provided around the anchor tube for supporting the anchor body from the side thereof, having a square cross section and driven into the ground at a position surrounding the anchor body; The outer tube is joined to the outer tube so as to close the opening on the upper end side, and has a top plate formed with a through-hole through which the anchor body can be inserted, and a rectangular cross section, An inner tube that is disposed on the inside and is driven into the ground at a position surrounding the anchor body, and is arranged in a circumferential direction of the inner tube and the outer tube, and is capable of supporting the anchor body from the outside, The lower end of the tube An anchor sheath tube comprising: a connecting member that connects the inner tube; and the outer tube being driven into the ground while the inner tube and the connecting member bite into the ground. Item 1).

  In this anchor sheath tube, since the outer tube has a rectangular cross section, the anchor sheath tube has a larger transport space than the conventional anchor sheath tube having a circular cross section. Without this, the contact area between the outer pipe of the anchor sheath pipe and the earth and sand can be increased, and the resistance force of the earth and sand acting on the outer pipe can be increased. In particular, when a tensile force is applied to the anchor body surrounded by the outer tube in a direction passing through the corner of the outer tube, a large resistance acts on the side surface of the outer tube, and this resistance The force suppresses the fall of the anchor body more reliably. That is, when a tensile force as described above is applied to the anchor body, a region where a resistance force such as earth and sand acts on the anchor sheath tube against the tensile force is the corner portion of the outer tube. It is ensured over two side surfaces forming a sufficient resistance force acting on the anchor main body. As described above, the anchor sheath tube supports the anchor body more stably without increasing the conveyance cost due to the increase in the conveyance space.

  In this anchor sheath tube, the anchor body is cylindrical, whereas the cross section of the inner tube is rectangular. Therefore, the difference in shape between the inner tube and the anchor body is caused. While securing a large gap for interposing earth and sand etc. into the ground and strengthening the biting of the anchor sheath pipe into the ground, the minimum gap between the inner pipe and the anchor body is kept small, and the anchor by the inner pipe The support capacity of the main body can be secured. Thus, this anchor sheath tube more effectively suppresses the anchor body from being overturned by the biting force into the ground and the lateral support force by the inner tube.

  In the present invention, the position of each vertex in the rectangular cross section of the outer tube and the position of each vertex in the rectangular cross section of the inner tube are shifted in the circumferential direction of the inner tube and the outer tube. (Claim 2).

  In this structure, even when an external force is applied to the anchor main body from a direction different from the direction in which the outer tube can effectively counter the external force, the force against the external force can be supplemented by the inner tube. . That is, in this structure, the direction in which the resistance force such as earth and sand effectively acts on two side surfaces forming the corner portion of the outer pipe, and the resistance force such as earth and sand forms the corner portion of the inner pipe. The direction that effectively acts on the two side surfaces is shifted, and it is possible to deal with external forces in multiple directions.

  In the present invention, it is preferable that the inner tube has a square cross section substantially circumscribing the anchor main body (Claim 3).

  In this structure, the inner tube stably supports the anchor body from four directions of the anchor body.

  In the above structure, the outer tube has a square cross section, and the position of each vertex in the square cross section of the inner tube and the position of each vertex in the square cross section of the outer tube are the inner tube and the outer tube. If the configuration is shifted by 45 degrees in the circumferential direction of the tube, the inner tube and the outer tube receive the external force more efficiently (Claim 4).

  Moreover, in this invention, it is preferable that the said connection material connects each vertex part and the said outer tube in the square cross section of the said inner tube (Claim 5).

  In this structure, the connecting material transmits an external force applied to the outer tube to the highly rigid apex portion of the inner tube, and suppresses deformation of the inner tube.

  Further, in the present invention, the top plate has a shape that closes a portion other than the four corners in the rectangular cross section of the outer tube in the opening portion on the upper end side of the outer tube, and at a portion other than the four corners of the outer tube. It is preferable that gaps that are joined to the respective sides of the upper end of the outer pipe and that open upward in the outer pipe are formed between the four corners of the outer pipe and the top plate. ).

  In this way, if gaps are formed at the four corners of the outer pipe so that the inside of the outer pipe is opened upward, moisture or the like accumulated in the outer pipe is discharged to the ground surface or the like through the gap. That is, this structure suppresses deterioration of the anchor sheath tube or the like.

  Further, in this structure, the top plate is joined in a long region of a straight portion other than the four corners of the outer tube, and the moisture and the like are effectively discharged while maintaining the joining strength of the top plate. be able to.

  Further, the present invention provides a cylindrical anchor body in which an external force in a direction substantially parallel to the ground is applied to the head until the head protrudes a predetermined amount from the ground, and the periphery of the anchor body And the anchor sheath tube for supporting the anchor body from the side, and the anchor body can be inserted through the through hole of the top plate and the inner tube in the anchor sheath tube, respectively. An anchor having a unique shape is provided (claim 7).

  In this anchor, the anchor main body is inserted into the anchor sheath tube, so that the anchor sheath tube stably supports the anchor main body.

  Further, the present invention is a soil retaining structure comprising a plurality of anchors driven into the ground at positions spaced apart from each other, and a rope stretched between the anchors on the ground, The anchor includes an anchor having the anchor sheath tube, and the rope is engaged with a head portion of the anchor main body having the anchor sheath tube, and is external to the anchor sheath tube as viewed from above the ground. An earth retaining structure is provided which is stretched so as to pass through at least one of the corners of the tube or in the vicinity thereof (Claim 8).

  In this structure, since the rope is stretched so as to pass through corners where the resistance force such as earth and sand acts efficiently in the outer tube of the anchor sheath tube, when a tensile force or the like is applied to the rope In addition, the outer tube efficiently receives the pulling force, and suppresses the displacement of the anchor body, the fall, and the like.

  As described above, the anchor sheath tube according to the present invention stably supports the anchor main body, and efficiently suppresses the fall of the anchor main body.

  Embodiments according to the anchor of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic perspective view showing an example of the anchor 10. 2 is a top view of the anchor sheath tube 30 of the anchor 10, FIG. 3 is a bottom view of the anchor sheath tube 30, FIG. 4 is a cross-sectional view of the anchor sheath tube 30, and FIGS. (C), FIG. 6 and FIG. 7 are views showing examples of use of the anchor 10.

  The anchor 10 has an anchor main body 20 and an anchor sheath tube 30.

  As shown in FIG. 5C, the anchor main body 20 supports a wire rope 50 (rope) that is driven into the ground 100 and is stretched around the head. The anchor body 20 has a cylindrical shape extending in the axial direction. The anchor sheath tube 30 is provided around the anchor body 20 and supports the anchor body 20 from the side thereof.

  First, the anchor sheath tube 30 will be described, and then the anchor body 20 will be described.

  The anchor sheath tube 30 includes an outer tube 31, a top plate 32, an inner tube 33, and a plurality of connecting members 34, as shown in FIG.

  The outer pipe 31 suppresses the fall or the like of the anchor body 20. The outer tube 31 is a rectangular tubular member extending in the axial direction of the anchor body 20. The outer tube 31 has a square cross section through which the anchor body 20 can be inserted. The outer pipe 31 is driven into the ground 100 at a position surrounding the anchor main body 20 and suppresses overturning of the anchor main body 20 by a resistance force of surrounding earth and sand acting on the side surface.

  Here, examples of the conventional outer pipe that occupies substantially the same transport space as the outer pipe 31 include those having a circular cross section inscribed in the square cross section of the outer pipe 31. Comparing the outer peripheral length of the tube 31, the outer periphery of the outer tube 31 having a square cross section according to the present embodiment is longer. Therefore, the outer tube 31 having the square cross section can receive more resistance force such as the earth and sand, and the fall of the anchor body 20 is more reliably suppressed. In particular, as shown in FIG. 9, when a pulling force is applied to the wire rope 50 stretched on the anchor main body 20 and an external force in the direction of arrow A1 is applied to the anchor main body 20, Since resistance force such as earth and sand acts on the side surfaces 31a and 31b, a greater resistance force can be obtained.

  The outer shape of the anchor sheath tube 30 is substantially determined by the shape of the outer tube 31 as shown in FIG. 1 and the like. As described above, the outer tube 31 has a square cross section. Accordingly, when the anchor sheath tubes 30 are loaded in order to transport the plurality of anchor sheath tubes 30, the anchor sheath tubes 30 can be loaded without any gaps, and a useless space can be saved. .

  The top plate 32 closes the opening on the upper end side of the outer tube 31. The top plate 32 is made of a substantially square plate material having a size substantially equal to the cross section of the outer tube 31, and has a shape in which four corners are cut out. The top plate 32 is connected to the upper end of the outer tube 31 by welding or the like at the outer periphery thereof except for the four corners. Specifically, the top plate 32 is connected to the straight portions of the respective sides of the upper end surface of the outer tube 31 so that gaps 32 f are formed between the corners of the outer tube 31. It is done.

  A through-hole 32a is formed in the center of the top plate 32 so as to penetrate vertically. The through hole 32a has a diameter slightly larger than the outer diameter of the anchor body 20 so that the anchor body 20 can be inserted.

  The inner pipe 33 supports the anchor main body 20 from the outside and suppresses the anchor main body 20 from falling. The inner tube 33 is a tubular member having a square cross section substantially circumscribing the anchor body 20. Accordingly, as shown in FIG. 9, when the anchor sheath tube 30 is driven into the ground 100 at a position surrounding the anchor main body 20, the inner surface of the inner pipe 33 is in contact with the outer periphery of the anchor main body 20. A gap 33 f is formed between the inner surface of the inner tube 33 and the outer peripheral surface of the anchor body 20.

  The inner pipe 33 is in contact with the anchor main body 20 as described above, thereby preventing the radial movement of the anchor main body 20 by the side surface and interposing earth and sand etc. in the gap 33f. The biting force of the anchor sheath tube 30 into the ground 100 is strengthened.

  The inner pipe 33 is fixed to the lower end portion of the outer pipe 31 so as to be coaxial with the axis of the outer pipe 31 inside the outer pipe 31. Specifically, the inner tube 33 is fixed such that each vertex, that is, each corner of the square cross section, and each vertex, that is, each corner, of the square cross section of the outer tube 31 are shifted by 45 degrees.

  The connecting member 34 connects the inner tube 33 and the outer tube 31. In the present embodiment, as shown in FIG. 1 and the like, the outer periphery of the inner tube 33 and the outer tube 31 is such that the four connecting members 34 connect the vertices of the inner tube 33 and the side surfaces of the outer tube 31. In the direction. The connecting member 34 is made of a plate member having substantially the same width as the inner tube 33 and extending in a predetermined direction. The connecting member 34 has one end connected to each corner of the inner tube 33 by welding or the like, and the other end connected to each side surface of the outer tube 31 by welding or the like. It is fixed inside the tube 31.

  Here, the connecting member 34 connects these side surfaces and the highly rigid corners of the inner tube 33 so as to extend substantially perpendicular to the respective side surfaces of the outer tube 31. Therefore, for example, as shown in FIG. 10, even when an external force in the vertical direction as shown by an arrow A2 is applied to the side surface of the outer tube 31, this external force is transmitted to the corner portion having high rigidity. Therefore, deformation of the inner tube 31 due to this external force is efficiently suppressed.

  Next, the anchor body 20 will be described.

  As described above, the anchor main body 20 supports the wire rope 50 stretched around the head.

  As shown in FIG. 1, the anchor main body 20 is of a type that supports the intersection of two wire ropes 50 as shown in FIG. A cap 25 capable of fixing the clip 21 is provided. The cap 25 is fixed to the head of the anchor main body 20 by bolts 22.

  The anchor clip 21 is for fixing two wire ropes 50 to each other at the intersection. As shown in FIG. 8, the anchor clip 21 has a receiving washer 21b and a holding washer 21a that sandwich the intersecting portion of the wire rope 50. Rope grooves 21d for guiding the two wire ropes 50 in directions perpendicular to each other are formed in the washers 21a and 21b. And this anchor clip 21 is the state fixed to the cap 25 fixed to the head of the said anchor main body 20 with the volt | bolt 25a etc., and the cross | intersection part of the two wire ropes 50 guided to the said rope groove 21d is carried out. Each wire rope 50 is fixed to the head of the anchor body 20 by being sandwiched between the receiving washer 21b and the holding washer 21a. Here, as shown in FIG. 6, the anchor clip 21 guides the wire ropes 50 so that the fixed wire ropes 50 pass near the corners of the outer tube 31 of the anchor sheath tube 30. It is fixed to the anchor body 20.

  On the other hand, as shown in FIG. 7 among the anchor main bodies 20, the type that supports the end of the wire rope 50 is also provided with a cap 25. However, the anchor clip 21 is not fixed to the cap 25. The cap 25 is fixed to the head of the anchor main body 20 by a wire rope fixing bolt 23 having a length sufficiently larger than its diameter. And this anchor main body 20 fixes the wire rope 50 to the head by the end part of the wire rope 50 being wound around the cap 25 being fixed to the head.

  Next, a procedure for driving the anchor 10 configured as described above into the ground 100 will be described.

  First, trial digging is performed at a position where the anchor main body 20 is driven. Specifically, the ground 100 is dug to a depth where the anchor main body 20 is driven using a puncher or the like.

  Next, the anchor sheath tube 30 is set at a position surrounding the anchor main body 20, that is, at a position surrounding the portion excavated so that the axis thereof is substantially perpendicular to the surface of the ground 100. Then, the top plate 32 of the anchor sheath tube 30 is struck, and the inner tube 33 and the connecting material 34 are driven into the ground 100 while biting into the ground 100. Specifically, the anchor sheath tube 30 is driven into the ground 100 until the top plate 32 and the surface of the ground 100 are substantially flush with each other.

  Next, the anchor body 20 is set so that the axis thereof is substantially perpendicular to the surface of the ground 100 at the trial digging position. Then, the upper end surface of the anchor main body 20 is hit, and the anchor main body 20 is driven into the ground 100 while being inserted through the through holes 32 a formed in the top plate 32 and the inner pipe 33. The anchor body 20 driven in this way is surrounded by the anchor sheath tube 30.

  Here, the top plate 32 of the anchor sheath tube 30 is exposed on the surface of the ground 100. A gap 32f is formed between the top plate 32 and the outer tube 31 as described above. That is, the anchor sheath tube 30 is fixed to the ground 100 in a state where the inner side of the outer tube 31 is open to the ground surface via the gap 32f. Therefore, the water etc. accumulated inside the outer pipe 31 can be evaporated from the gap 32f to the ground surface.

  Next, the cap 25 and the anchor clip 21 are attached to the head of the anchor main body 20. Then, with the two wire ropes 50 being sandwiched between the receiving washer 21b and the holding washer 21a of the anchor clip 21, the washers 21a and 21b are tightened, and the intersection of each wire rope 50 is connected to the head of the anchor body 20. Secure to the part. At this time, the wire ropes 50 are stretched so that each wire rope 50 passes through the vicinity of the corner of the outer tube 31.

  Further, the end of each wire rope 50 is stretched around the head of a predetermined anchor main body 20. Specifically, as shown in FIG. 7, the end portion of the wire rope 50 is wound around the anchor body 20 while being inserted between the wire rope fixing bolt 23 and the top plate 32. The wire ropes 50 are fixed to each other with a predetermined metal fitting, and the ends of the wire ropes 50 are fixed to the head of the anchor main body 20. Also in this case, these wire ropes 50 are stretched so that each wire rope 50 passes through the corner of the outer tube 31.

  In this way, when the wire rope 50 is stretched on the anchor 10 struck to the ground 100, the net 52 or the like is attached to the wire rope 50, so that the net 52 or the like prevents falling rocks or the like.

  Next, the action of the anchor 10 when an external force is applied to the anchor 10 driven into the ground 100 as described above will be described.

  As described above, in the anchor 10, the wire rope 50 is stretched so as to pass through the corner portion of the outer tube 31. Therefore, when a pulling force is applied to the wire rope 50, a force in the direction of the arrow A1 in FIG. 9, that is, the direction passing through the vicinity of the corner of the outer tube 31, is applied to the anchor body 20 by the pulling force. become.

  As described above, when an external force in the direction of the arrow A <b> 1 is applied to the anchor main body 20, the anchor main body 20 first tries to be displaced in the inner tube 33. However, as described above, in the anchor 10, the side surface 33 a of the inner tube 33 and the anchor body 20 are in contact with each other, and thus the side surface 33 a of the inner tube 33 suppresses the radial movement of the anchor body 20. Further, the external force applied to the anchor body 20 is transmitted to the outer tube 31 via the inner tube 33 and the connecting member 34. However, as shown in FIG. Since resistance force such as earth and sand acts on the two side surfaces 31a and 31b forming the corners of the pipe 31, the resistance force prevents the outer pipe 31 and thus the anchor body 20 from overturning. In particular, when an external force is applied in the direction of the arrow A1 as shown in FIG. 9, only one side surface 31a of the outer tube 31 is applied as in the case of the external force applied in the direction of the arrow A2 in FIG. Compared to the case where resistance force such as earth and sand acts, more resistance force due to this earth and sand can be secured. In addition, since the gap 33f is formed between the inner tube 33 and the anchor body 20, the biting force of the anchor sheath tube 30 with respect to the ground 100 is strengthened. As a result, the anchor body 20 is effectively prevented from falling. Furthermore, in the inner tube 33, the force applied to the side surfaces 31a and 31b of the outer tube can be received by the highly rigid corners, so that deformation of the inner tube 33 is effectively suppressed.

  Here, in the present embodiment, FIG. 6 shows the case where the wire rope 50 is stretched so as to pass near the corner of the outer tube 31, but the stretched position of the wire rope 50 is shown in FIG. It is not limited to the position shown. That is, as shown in FIG. 7, it may be a position that accurately passes through a corner portion of the outer tube 31, or may be a position further away from this corner portion, and the anchor main body via each wire rope 50. If these wire ropes 50 are stretched so that the external force acting on 20 acts in the direction passing through the corners of the outer tube 31, the anchor body can be effectively prevented from falling.

  On the other hand, at the upper end portion of the anchor sheath tube 30, the top plate 32 suppresses deformation of the outer tube 31 due to an external force applied to the anchor body 20. If the deformation of the outer tube 31 is suppressed, a decrease in the support force of the anchor body 20 due to the deformation of the outer tube 31 is suppressed, and the anchor body 20 is prevented from falling.

  As described above, according to the anchor sheath tube 30, since the outer tube 31 has a square cross section, the outer tube 31 and the anchor tube 30 can be formed without increasing the transport space of the anchor sheath tube 30. By increasing the contact area with the earth and sand, the resistance force of the earth and sand against the external force can be increased, and the fall of the anchor main body 20 is more reliably suppressed.

  In the anchor sheath tube 30, the anchor main body 20 has a circular cross section, whereas the inner tube 33 has a square cross section. A minimum gap between the inner pipe 33 and the anchor main body 20 is secured while securing a gap 33f for interposing earth and sand between the main body 20 and reinforcing the biting force of the anchor sheath pipe 30 into the ground 100. The holding capacity of the anchor main body 20 by the inner pipe 33 can be increased while being suppressed small, and the fall of the anchor main body 20 can be more effectively suppressed.

  Further, as described above, the position of each vertex in the rectangular cross section of the outer tube 31 and the position of each vertex in the rectangular cross section of the inner tube 33 are determined in the circumferential direction of the inner tube 33 and the outer tube 31. If it is shifted, the direction in which the outer tube 31 effectively receives the resistance force such as earth and sand and the direction in which the inner tube 33 effectively receives the resistance force such as earth and sand are shifted. It is possible to cope with multidirectional external forces applied to the main body 20.

  Further, if the cross section of the inner tube 33 is a square shape that substantially circumscribes the anchor main body 20, the anchor main body 20 can be stably supported from four directions by the inner tube 33.

  Furthermore, the cross section of the outer tube 31 is a square cross section, and the position of each vertex in the square cross section of the inner tube 33 and the position of each vertex in the rectangular cross section of the outer tube 31 are the inner tube 33 and If the inner tube 33 and the outer tube 31 are configured to be shifted by 45 degrees in the circumferential direction of the outer tube 31, the outer force applied to the anchor body 20 can be received more efficiently, and the fall of the anchor body 20 can be more reliably suppressed. .

  In addition, if the connecting member 34 is configured to connect each vertex portion in the rectangular cross section of the inner tube 33 and the outer tube 31, an external force applied to the outer tube 31 is applied to the inner tube 33. This can be transmitted to the respective apex portions having high rigidity, and deformation of the inner tube 33 is suppressed.

  In addition, the top plate 32 is shaped so as to close a portion other than the four corners in the rectangular cross section of the outer tube 31 in the opening portion on the upper end side of the outer tube 31, If a gap 32f is formed between the four corners of the outer pipe 31 and the top plate 32 so as to open the inside of the outer pipe 31 upward, via the gap 32f. Moisture and the like accumulated in the outer tube 31 can be discharged to the ground surface or the like.

  In addition, as a retaining structure using the anchor 10, the wire rope 50 passes through at least one corner or the vicinity thereof among the corners of the outer tube 31 of the anchor sheath tube 30 as viewed from above the ground 100. If so, the outer tube 31 efficiently receives an external force applied to the anchor main body 20 via the wire rope 50, and suppresses misalignment or overturning of the anchor main body.

  Here, in the embodiment, the case where the outer tube 31 and the inner tube 33 are each configured by a member having a square cross section has been described, but the present invention is not limited thereto, and may be a rectangle, a rhombus, or the like.

  Further, the amount of deviation between the vertices of the outer tube 31 and the inner tube 33 is not limited to the above.

  Further, the shape and the installation position of the connecting material are not limited to the above, and in addition to the configuration for connecting each vertex of the inner tube 33 and the central portion of the side surface of the outer tube 31 as described above, You may make it connect a center part and each vertex of the outer tube | pipe 31. FIG.

  Further, the shape of the top plate 32 and the shape of the gap 32f are not limited to the above.

  Further, the method of stretching the wire rope 50 is not limited to the above.

It is a schematic perspective view of the anchor which concerns on embodiment of this invention. It is a schematic top view of the sheath tube for anchors concerning the embodiment of the present invention. FIG. 3 is a bottom view of FIG. 2. FIG. 3 is a cross-sectional view of FIG. 2. (A) It is a schematic sectional drawing which shows the state which driven the sheath pipe for anchors shown in FIG. 2 into the ground. (B) It is a schematic sectional drawing which shows the state which driven the anchor shown in FIG. 1 in the ground. (C) It is a schematic sectional drawing which shows the state which stretched the wire rope to the anchor shown to (b). It is a top view which shows the state which stretched the wire rope to the anchor shown in FIG. It is a top view which shows the state which stretched the wire rope to the anchor shown in FIG. It is a schematic perspective view of the anchor clip attached to the anchor shown in FIG. It is a schematic sectional drawing for demonstrating the effect | action of the anchor shown in FIG. It is a schematic sectional drawing for demonstrating the effect | action of the anchor shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Anchor 20 Anchor main body 21 Anchor clip 30 Anchor sheath pipe 31 Outer pipe 32 Top plate 32a Through-hole 32f Space | gap 33 Inner pipe 34 Connecting material 50 Wire rope (rope)
100 ground

Claims (8)

It is provided around a cylindrical anchor body that is driven into the ground until the head protrudes a predetermined amount from the ground and an external force in a direction substantially parallel to the ground is applied to the head. An anchor sheath tube for supporting from the side,
An outer tube having a rectangular cross section and driven into the ground at a position surrounding the anchor body;
A top plate that is joined to the outer tube so as to close the opening on the upper end side of the outer tube, and has a through-hole through which the anchor body can be inserted, and
An inner tube that has a rectangular cross section, is arranged inside the outer tube and is driven into the ground at a position surrounding the anchor body, and can support the anchor body from the outside;
Arranged in the circumferential direction of the inner tube and the outer tube, comprising a connecting material for connecting the lower end portion of the outer tube and the inner tube,
The anchor sheath tube, wherein the outer tube is driven into the ground while the inner tube and the connecting material bite into the ground. In the sheath tube for anchors according to claim 1,
The position of each vertex in the rectangular cross section of the outer tube and the position of each vertex in the rectangular cross section of the inner tube are shifted in the circumferential direction of the inner tube and the outer tube. Sheath tube. In the sheath tube for anchors according to claim 2,
The inner tube has a square cross section substantially circumscribing the anchor body, and is a sheath tube for anchor. The anchor sheath tube according to claim 3,
The outer tube has a square cross section,
For anchors, wherein the position of each vertex in the square cross section of the inner tube and the position of each vertex in the rectangular cross section of the outer tube are shifted by 45 degrees in the circumferential direction of the inner tube and the outer tube Sheath tube. In the sheath tube for anchors in any one of Claims 1-4,
The connecting pipe connects each apex portion in the rectangular cross section of the inner pipe to the outer pipe, and the anchor sheath pipe. In the sheath tube for anchors in any one of Claims 1-5,
The top plate has a shape that closes a portion other than the four corners in the rectangular cross section of the outer tube in the opening portion on the upper end side of the outer tube, and the top plate has a shape other than the four corners of the outer tube. It is joined to each side,
The anchor sheath tube, wherein gaps are formed between the four corners of the outer tube and the top plate so as to open the inside of the outer tube upward. A columnar anchor body that is driven into the ground until the head protrudes a predetermined amount from the ground and an external force in a direction substantially parallel to the ground is applied to the head,
The anchor sheath tube according to any one of claims 1 to 6, which is provided around the anchor body and supports the anchor body from the side,
The anchor main body has a shape that can be inserted through the through hole of the top plate and the inner tube of the anchor sheath tube, respectively. A soil retaining structure comprising a plurality of anchors driven into the ground at positions separated from each other, and a rope stretched between the anchors on the ground,
The anchor having the sheath tube for anchor according to claim 7 in the plurality of anchors,
The rope is engaged with the head portion of the anchor main body having the anchor sheath tube, and at least one corner portion or the vicinity thereof in the corner portion of the outer tube of the anchor sheath tube as viewed from above the ground. Earth retaining structure characterized by being stretched to pass through.

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