JP2999189B1 - Expansion type anchor member - Google Patents

Abstract

The present invention provides a driving-type anchor member that is driven into the ground such as the ground and exhibits a large pull-out resistance. SOLUTION: An inner pipe 6 is protruded from a rear end of an entrance section 5 and the inner pipe 6 is inserted into an outer pipe 9. A portion on the front end side of the outer tube 9 is an anchor tube portion 7 in which anchor pieces 22 are juxtaposed in the circumferential direction. By advancing the rear end of the outer tube toward the entry portion 5, each anchor piece 22 is bent outward in a mountain shape to form an anchor body. An outflow hole 14 for injecting grout into the portion where the anchor body is formed is provided in the inner pipe 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enlarged driving type anchor member which is driven into the ground such as a ground and has a large pull-out resistance.

[0002]

2. Description of the Related Art An anchor shaft such as a reinforcing bar is driven into a ground or the like to secure a required pull-out resistance force by frictional resistance between a peripheral surface of the anchor shaft and the ground or the like. Since the pull-out resistance per unit length of the anchor shaft is not so large, it is necessary to drive a very long anchor shaft in order to secure a predetermined pull-out resistance, resulting in poor workability and economical efficiency. There was a problem with great disadvantages.

[0003] In order to improve the pull-out resistance, there has been proposed an anchor member configured to form an enlarged portion after being inserted into the ground or the like. The anchor member has a rod shape having an inner and outer double pipe structure and an enlargement mechanism portion provided at a tip portion thereof, and after being inserted into an insertion hole formed by drilling by a boring machine or the like,
When the inner pipe is pulled by a hydraulic jack or the like, the enlargement mechanism is enlarged in an umbrella shape to form an anchor body. By filling grout into the portion where the anchor body is formed and the gap between the insertion holes, not only the peripheral surface frictional resistance of the anchor member but also the anchor body hardened with grout by hardening of the grout. Thus, a predetermined pull-out resistance is exhibited.

[0004]

However, the following problems have been encountered with the anchor member of the above-described type in which the tip is enlarged by the pulling method. (1) Since a rod-shaped anchor member was inserted into an insertion hole formed by drilling a ground or the like with a boring machine, etc., the cost of drilling with a boring machine etc. was high, and the construction cost as a whole increased. was there.

(2) Since the anchor member is inserted after drilling, it is very difficult to drill the hole when the soil is in a sandy state or the like which is easily broken, and when the anchor member is inserted, the insertion hole falls. Therefore, there is a problem that it becomes difficult to insert the anchor member or a situation in which drilling needs to be performed again.

(3) In order to smoothly insert the anchor member, it is necessary to form an insertion hole having a hole diameter larger than the outer diameter of the anchor member, but if the hole diameter is increased, the insertion hole is filled. The amount of grout to be performed is increased. The reason why the grout is filled in this way is to integrate the anchor member and the ground or the like via a hardened grout so as to increase the peripheral frictional resistance of the anchor member. However, even if a large amount of grout is filled into the insertion hole having a large hole diameter to form an excessive friction resistance portion, the peripheral friction resistance force exceeds the pull-out resistance of the anchor member itself set according to the purpose of use. Was simply unnecessarily large, and was completely uneconomical.

(4) Further, since the anchor body is formed by pulling the inner tube, it is impossible to form an enlarged portion in a plurality of stages in the length direction of the anchor member, and the pull-out resistance force that can be secured is limited. was there.

[0008] It is an object of the present invention to provide an expanding type anchor member which can solve such a problem.

[0009]

In order to solve the above-mentioned problems, the present invention employs the following means. That is, the expansion type driving type anchor member according to the present invention (hereinafter referred to as a driving type anchor member) is a driving type anchor member in which the anchor body is expanded and formed while being driven into the ground. At the rear end of the advancing portion, an inner pipe extending rearward is projected, and the inner pipe is inserted into the outer pipe, and a front end portion of the outer pipe is an anchor cylinder. In the anchor tube portion, slits extending in the front-rear direction are arranged in the circumferential direction, and a portion between adjacent slits is an anchor piece. Then, the rear end of the outer tube is pressed forward with the front end of the outer tube being supported by the rear end of the entry portion, and the outer tube is advanced, whereby each of the anchor pieces is angled outward. The anchor body can be formed in an enlarged manner by bending the anchor body, and an outflow hole for injecting grout into a portion where the anchor body is formed is provided in the inner tube.

In the driving type anchor member, a plurality of the anchor tube portions are provided at predetermined intervals in the longitudinal direction of the outer tube, and are positioned at the front side as the outer tube is pushed forward as described above. The more the anchor piece located on the front side, the more the anchor-shaped bending deformation of the anchor piece constituting the anchor tubular part to occur occurs before the angle-shaped bending deformation of the anchor piece constituting the anchor tubular part located on the rear side. It is preferable to set the rigidity of the central portion of the piece in the front-rear direction small.

In the driving type anchor member, a plurality of the anchor tube portions are provided at predetermined intervals in a length direction of the outer tube, and the outer tube is pushed forward as the outer tube is pushed forward as described above. As the angle-shaped bending deformation of the anchor piece constituting the located anchor cylinder portion occurs earlier than the angle-shaped bending deformation of the anchor piece constituting the anchor cylinder portion located on the rear side, the more the anchor piece located on the front side, It is preferable to set the width of the anchor tube portion as viewed in the circumferential direction small.

[0012] In each of the driving-type anchor members, the anchor piece is slightly bent outwardly at a substantially central portion in the front-rear direction, and the outer pipe is pressed and advanced as described above. However, it is preferable to be configured so as to be bent outward in a chevron with a substantially central portion in the front-rear direction as a boundary. In this case, it is preferable that the anchor piece is slightly bent outward at a substantially central portion in the front-rear direction, and the central portion is formed to be thin. Alternatively, it is preferable that the anchor piece is slightly bent outward at a substantially central portion in the front-rear direction, and a concave groove is provided on an outer surface of the central portion in a circumferential direction of the anchor cylinder portion.

In each of the driving anchor members, a tubular net-like body which expands as the anchor piece bends in a mountain shape and can cover the whole of the anchor body from the outside is provided on the anchor tubular portion. It is preferable to cover and fix the front and rear end portions of the mesh body to the front and rear end portions of the anchor tubular portion.

In each of the driving-type anchor members, a rear portion of the inner tube is slightly protruded from a rear end of the outer tube, and a through hole is provided in the rear portion in a direction crossing the axis of the inner tube. Good.

[0015] In each of the driving-type anchor members, it is preferable that a screw hole opened at a rear end of the inner pipe is provided in a rear end portion of the inner pipe in an axial direction of the inner pipe.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 3, a driving-type anchor member 1 (hereinafter referred to as an anchor member) according to the present invention includes an entrance portion 5 in which a cylindrical portion 3 is concentrically connected to a rear end of a tapered conical portion 2. At the rear end of the cylindrical portion 3, an inner tube 6 extending rearward with an axis common to the entry portion 5 is protruded, and the inner tube 6 is concentric with an anchor tube portion 7 at a front end portion. The anchor body 10 is inserted into the outer tube 9 provided in triplicate at small intervals, and the anchor body 10 is formed in an enlarged manner as shown in FIG. It has an appropriate length of, for example, 1.5 to 3 m.

As shown in FIG. 3, the inner tube 6 is provided with a through hole 12 which is long in the axial direction in a direction crossing the axis of the inner tube in a rear portion 11 thereof. A screw hole 13 opening at the end is provided in the axial direction of the inner tube. In the front end portion of the inner tube 6, the front end portion and the portion where the anchor body 10 is formed, for example, at the opposing portion of the peripheral surface portion, the outflow hole of grout on the same axis in the front-rear direction. (For example, a circular hole) 14 (FIG. 1) is provided. In the middle part of the inner tube 6, a grout outflow hole 14 as a long hole, for example, which is long in the axial direction is provided in a portion facing the peripheral surface. The reason why the outflow hole 14 is formed as a long hole is to take into account an error in the amount of driving when the outer tube 6 is driven as described later.

On the other hand, as shown in FIGS. 1 and 2, the outer tube 9 has its front end 15 welded to the rear end 16 of the entrance 5 (a plane perpendicular to the axis of the entrance). As shown in FIGS. 1 and 5, the rear end 17 of the outer tube is located slightly inside the rear end 19 of the inner tube, and the through hole 12 is exposed.

As shown in FIG. 2, in the present embodiment, the anchor cylinder 7 is formed of, for example, a stainless cylinder 20, and both ends 20a, 20a of the cylinder 20 are formed. Except for 20a, slits 21 extending in the front-rear direction are arranged side by side at equal angular pitches in the circumferential direction, and a portion between adjacent slits is an anchor piece 22. Also, each of the anchor pieces 22 is bent outwardly in a loose mountain shape with a center part in the front-rear direction as a boundary, and an outer surface of the center part has:
A concave groove 23 is provided in the circumferential direction of the anchor cylinder 7. Both ends of the cylindrical body 20 are reinforced by reinforcing pipes 25.

Further, the grout outlet hole 2 is positioned on the peripheral surface of the front end of the anchor tube portion 7 connected to the entrance portion 5 in alignment with the outlet holes 14 provided at the front end of the inner pipe 6.
6 and 26 are provided so as to face each other, and also at an intermediate portion of the outer tube 9, at an opposing portion of a peripheral surface thereof, coincides with the outflow hole 14 as the elongated hole when the outer tube advances as described later. Outflow holes 26, 26 (FIG. 1) for the resulting grout are provided facing each other.

Further, when the rear end 17 of the outer tube is hit as described later, the anchor tube portion located on the front side is so arranged that the anchor piece 22 bends in a mountain shape sequentially from the anchor tube portion located on the front side. The number of slits 21 is increased, and the width of the anchor piece in the circumferential direction of the anchor tube portion is set small.

When the rear end 17 of the outer tube is pressed by, for example, striking forward, the anchor piece 2 is slightly bent in a mountain shape as described above and has a concave groove 23 on the outer surface at the center.
2 is bent outward in a mountain shape to form an umbrella-shaped anchor body 10 as shown in FIG.

When the anchor member 1 having the above structure is driven into the ground 27 (FIG. 6), for example, an auxiliary tool 32 as shown in FIG. 5 is used, but the rear end of the inner pipe is damaged by the impact at the time of driving. In order to prevent this, a screw shaft portion 31 of a protection bolt 30 having a bolt head 29 having a diameter substantially equal to the outer diameter of the inner tube is screwed into the screw hole 13 (FIG. 3) at the rear end of the inner tube. The bolt head 29 is kept in contact with the rear end 19 of the inner tube.

As shown in FIGS. 5 and 7, the auxiliary tool 32 has a blind hole 33 having an open front end.
The rear portion 11 of the inner tube is inserted into a front portion 35 of the inner tube, and a front and rear end 3 is inserted into a rear portion 36 of the blind hole 33.
A pressing rod 41 is inserted so that the bolts 7 and 39 can contact the bolt head 29 and the bottom surface 40 of the blind hole. The front portion of the blind hole 33 is expanded to form an expansion hole 43 into which the rear end portion 42 of the outer tube is inserted. In the peripheral surface portion of the auxiliary tool 32, opposed long holes 45, 45 are aligned with the through holes 12 provided in the inner tube 6 and extend from a portion near the open end of the blind hole to a portion near the bottom surface. It is provided.

When the anchor member 1 is driven into the ground 27 in a state of being slightly inclined downward, for example, by using the auxiliary tool 32 having the above-described structure, the following operation is performed. First, a substantially vertical surface 47 as shown in FIG. 6 is formed by cutting out a part of the slope 46 of the ground, and a punching plate for punching, for example, having a square plate shape and having an insertion hole 49 at the center is formed. The plate 50 is brought into contact with the vertical surface 47. Thereafter, as shown in the same figure, the entry portion 5 is fitted into the insertion hole 49, and the tip portion is slightly pushed into the vertical surface 47, so that the anchor member 1 is in a required inclined state (for example, 5 ° with respect to the horizontal line). (In a state inclined to -10 degrees). At this time, the auxiliary tool 32 is attached to the rear end portion of the anchor member 1.
As shown in FIG. 7, after the pressing rod 41 is inserted into the blind hole 33, the rear portion 11 of the inner tube is inserted into the blind hole 33, and the protection screw is screwed into the rear end of the inner tube. Bolt 30
Is brought into contact with the front end 37 of the pressing rod 41 in contact with the bottom surface 40 of the blind hole. And outer tube 9
The rear end portion 42 is placed in the expansion hole 43. In this state, the rear end of the outer tube is slightly away from the bottom of the expansion hole as shown in FIG. 7 (B).

In this state, when the rear end 55 of the assisting tool is struck by a striking device (not shown) as shown by an arrow in FIG. 7, the rear end of the inner tube 6 is struck through the pressing rod 41,
With the pressing by this impact, the anchor member 1
It is sequentially driven. For example, as shown in FIG. 8, the through-hole 12 of the inner pipe 6 is
The driving is completed in a state where it is located outside of No. 6. Then, as shown in FIGS. 9 to 10, the auxiliary tool 32 is removed, the pressing rod 41 in the blind hole 33 is removed, the rear end portion 42 of the outer tube is inserted into the expansion hole 43, and The holes 45 are aligned with the through holes 12.

Thereafter, a plate-like stopper member 57 is passed through the elongated holes 45 and 45 and the through hole 12 in the communicating state, and both end portions 59 and 59 are attached to the outer surface 5 of the backing plate 50.
6 is in a contact state. In this state, the auxiliary tool rear end 55
Is hit by a hitting device (not shown) as shown by an arrow in FIG. 10 in a state where the stopper member 57 is in contact with the abutment plate 50 and the advancement of the inner tube 6 is prevented, that is, the fixed position is entered. With the outer tube front end 15 received by the part 5, the outer tube 9 is advanced. As a result, as shown in FIG. 11, each of the anchor pieces 22 which are slightly bent outward with respect to the center part in the front-rear direction and provided with a circumferential groove 23 on the outer surface of the center part, With the central part as a border, it is bent into a mountain shape while digging into the ground,
An umbrella-shaped enlarged anchor body 10 is formed. The amount by which the outer tube rear end 17 is advanced is set by checking in advance the relationship between the extent of expanding the anchor tube and the amount of advance of the outer tube before driving the anchor member.

In this embodiment, as shown in FIG. 1, three anchor cylinder portions 7a,
Since the anchor pieces 7b and 7c are provided, and the anchor pieces located on the front side are formed narrower and are easily bent, the anchor cylinder portion 7a located on the front side is enlarged as required as shown in FIG. Then, after the anchor body 10a is formed in the ground, the anchor tubular portion 7b located in the middle is
, The anchor body 10b is formed underground as required, and thereafter, the anchor cylinder portion 7c located at the rear end
Is enlarged as required as shown in FIG.
c will be formed underground.

When the rear end 55 of the auxiliary tool is hit (FIG. 10), the auxiliary tool 32 advances within the length of the elongated hole 45, and the outer tube rear end 17 advances by the amount of advance. However, when the amount of advance of the rear end of the outer tube within the above-described range is not enough to expand the anchor tube portion 7, the extension tube 61 shown in FIG. 14 is used. Specifically, as shown in FIG. 16, with the stopper member 57 approaching the rear end 62 of the long hole 45 as shown in FIG. 15, the stopper member 57 is pulled out and the auxiliary tool 32 is removed, as shown in FIG. 16. Then, the pipe 61 is extrapolated to the rear part 11 of the inner pipe.

As shown in FIG. 14, the extension pipe 61 has a through hole 6 through which the rear portion 11 of the inner pipe can be inserted.
3, the front end of which is enlarged to form a rear end portion 42 (FIG. 5) of the outer tube and an expanded hole 65 into which the rear end portion of the extended tube can be inserted. However, after the rear end portion 42 of the outer tube is inserted into the hole portion 65, the rear end portion 66 of the extension tube 61 is housed in the expansion hole portion 43 of the auxiliary tool, and then the same as above. , Aligned slots 45, 45
Then, the stopper member 57 is made to penetrate the through hole 12, and thereafter, the rear end of the assisting tool is hit with the stopper member 57 abutting on the abutment plate 50 to prevent the inner tube 6 from moving forward. Thus, the rear end 17 of the outer tube is further advanced within the length of the long hole 45 in a state where the front end 15 of the outer tube is supported by the rear end of the entrance portion 5.

Until the anchor cylinder portions 7a, 7b, 7c can be brought into the required enlarged state, the extension tube 61 is inserted into the hole 65 at the rear end thereof and joined sequentially, so that the rear end 60 of the outer tube is joined. Let them move forward. FIG. 13, FIG.
Numeral 7 indicates a hitting completed state when the final anchor body 10c is formed.

After forming the anchor bodies 10a, 10b and 10c by enlarging each anchor tube 7, the protective bolt 30 is removed as shown in FIG. 18, and the rear end of the inner tube is formed as shown in FIG. The injection pipe 67 is inserted from 19, and the end of the injection pipe is positioned at the front end of the inner pipe. When grout is supplied in this state, the grout supplied from the end of the injection pipe is discharged from the front end of the outlet (the first outlet shown in FIGS. 3 and 18).
4a, and is filled in the gap 70 between the entrance and the ground so as to be surrounded by the dashed line in FIG.

Thereafter, the injection pipe 67 is pulled out slightly.
The end of the injection tube is connected to the second outlet hole 14b shown in FIGS.
When the grout is supplied in this state, the grout supplied from the end of the injection pipe flows out from the second outlet hole 14b, and the grout is supplied to the portion where the anchor body 7a at the front end is formed. It is injected, and the hardening forms a bulbous mass 71a so as to be surrounded by a dashed line in FIG. In this way, the operation of pulling out the injection pipe 67 is sequentially performed, and grout is supplied from the third outlet hole 14c and the fourth outlet hole 14d shown in FIGS. , 71c.

Thereafter, the injection pipe is further pulled out, and the end of the injection pipe is positioned at a portion where the outflow hole 14e as the long hole exists. When grout is supplied in this state, the grout supplied from the end of the injection pipe is discharged. It flows out from the fifth outlet hole 14e and fills the gap 72 between the outer pipe and the ground so as to be surrounded by the dashed line in FIG. Since the anchor member 1 is driven in a slightly inclined state as described above, air is smoothly vented from the rear end of the inner tube during grouting.

As a result, the bulbous masses 71b, 71c,
A large pull-out resistance is exerted by the pull-out resistance force of 71d and the frictional force of the peripheral surface of the outer pipe integrated with the ground via the cured material.

Anchor member 1 driven as described above
20 is used to support a fence 75 when forming a stepped planting portion 73 as shown in FIG. 19, for example.
As shown in FIG. 19, the distal end 77 of the fixed rod 76 screwed into the screw hole 13 at the rear end of the inner tube 6 is fixed to a support 79 (FIG. 19) constituting the fence 75. .

[Other Embodiments] (1) FIGS. 21 to 23 show an anchor member 1 in which an anchor cylinder portion 7 is formed in one step, and a columnar portion is provided at the rear end of the conical portion 2 which is formed into a tapered shape. At the rear end of the cylindrical portion 3 of the entry portion 5 formed by concentrically connecting the portions 3, an inner tube 6 extending rearward with an axis common to the entry portion 5 is projected and provided. 6 is inserted into an outer tube 9 provided with an anchor tube portion 7 at a front end side portion, and the anchor body 10 is formed in an enlarged manner as shown in FIG. It has a suitable length of, for example, 1.5 to 3 m.

The method of use is the same as that described above. For example, as shown in FIG. 24, after the anchor member 1 is driven into the ground 27, the stopper member 57 is moved in the same manner as shown in FIG.
In a state where the forward movement of the inner pipe 6 is prevented by the
Is pressed forward in a state where the front end 15 of the outer tube is supported by the rear end of the entrance portion 5, so that the anchor piece 22 can be bent outward in a chevron as shown in FIG. An umbrella-shaped anchor body 10 can be formed.

Thereafter, grout is injected in the same manner as described above using an injection tube inserted into the inner tube 6, and this is injected into the grout as shown in FIG.
The surrounding portion of the entry portion 5, the portion where the anchor body 10 is formed, and the surrounding portion of the outer tube are filled so as to be surrounded by a dashed line. As a result, a bulbous mass 71 is formed at the front end portion of the anchor member 1 by the hardened grout, and the gap 72 between the outer tube and the ground is filled with the hardened grout. The integration with the member is achieved, and the frictional resistance of the outer tube against the peripheral surface is increased.

The pull-out resistance by the bulb-shaped mass 71 at the front end portion and the frictional resistance of the outer tube on the peripheral surface ensure a large pull-out resistance as a whole.

(2) The anchor tube portion of the outer tube constituting the anchor member according to the present invention may be formed by directly providing a slit on the peripheral surface of the outer tube.

(3) Outflow holes for grout provided in the inner pipe and the outer pipe may be provided only in the portion where the anchor body is formed.

(4) The front end of the outer tube may be fixed to the entry portion by welding or the like as described above, or may be in contact with the rear end of the entry portion.

(5) In the case where the anchor tube portions are provided in a plurality of stages,
The arrangement interval can be set as required according to the purpose.

(6) When grout is injected into the anchor body 10 formed as described above and enlarged, and hardened to form a bulbous mass 71a surrounded by a dashed line in FIG. Through the opening 80 (FIG. 28) between the anchor pieces 22, 22, a large earth mass is
By entering the inside, the strength of the bulbous mass 71a may be reduced accordingly. Therefore, in order to prevent this, as shown in FIG. 27, it is preferable to cover the anchor tubular portion 7 with a tubular net 81 in advance. The net 81
Can be formed into a tubular shape using, for example, a wire mesh, and as the anchor piece 22 bends in a mountain shape, expands into a bag shape as shown in FIG. 28 to cover the entirety of the anchor body 10 from the outside. And cylindrical end portions 82, 8 before and after that.
3 is fixed to the front and rear end portions 85 and 86 of the anchor tubular portion 7 by means such as welding. The intermediate portion 87 of the mesh body has room to expand in a bag shape as shown in FIG. 28, and is appropriately folded in the circumferential direction and formed into a cylindrical shape as shown in FIGS. 29 to 30, for example. Have been.

The reticulated body 81 expanded as described above covers the open portion 80 formed between the adjacent anchor pieces 22, 22 in the bent state of the mountain, so that a large earth mass is formed in the expanded anchor body 10. Intrusion can be prevented by the mesh of the mesh body 81, so that the bulbous mass 71a
Can be kept high.

The tubular net 81 can be made of a resin net, besides using a wire net as described above.
It can also be formed using a perforated resin sheet or the like provided with a large number of holes. Means for fixing the front and rear end portions of the tubular body to the front and rear end portions of the anchor tubular portion may be various fastening means as long as the mesh body does not come off when the anchor member 1 according to the present invention is driven. Means can be adopted.

(7) The anchor member according to the present invention may be used by driving into an embankment.

[0049]

The present invention has the following excellent effects. (1) When the anchor member according to the present invention is used, the anchor body can be enlarged and formed after the anchor member is driven into a ground or the like as required. Can form a bulbous mass. Further, the gap between the outer tube and the inner peripheral surface of the insertion hole can be filled with a cured grout. Therefore, according to the present invention, since the pull-out resistance by the expanded anchor body is exerted and the peripheral surface frictional resistance on the outer peripheral surface of the outer tube of the anchor member can be exerted, a large pull-out resistance can be secured as a whole. As a result of exerting such a large pull-out resistance, the driving-type anchor member according to the present invention is driven in various directions such as the inclined direction and the vertical direction according to the purpose as described above, and the anchor body is enlarged. By being formed, the required pull-out resistance effectively supports structures such as fence-like structures installed on slopes, and effectively lifts or tilts underground civil engineering structures by buoyancy. Can be prevented. The increase in the pull-out resistance due to the filling of the grout is achieved by inserting an anchor member into an insertion hole formed by drilling a ground or the like, expanding the tip portion thereof, and then expanding the peripheral surface of the anchor member and the inner circumference of the insertion hole. This can also be achieved by the conventional insertion and expansion type anchor member in which grout is filled between surfaces, but in this case, as described above, an unnecessarily large amount of grout must be injected, and the construction cost increases. However, according to the present invention, it is economical to secure a desired pull-out resistance with a small amount of grout filling necessary to secure a peripheral friction resistance corresponding to the pull-out resistance of the anchor member. Property is obtained.

(2) According to the present invention, the length of the anchor piece constituting the anchor cylinder, the number of anchor pieces, and the number of steps of the anchor cylinder are set as required even for soil having low strength. As a result, it is possible to secure the optimal pull-out resistance suitable for the soil.

(3) Since the anchor member according to the present invention is of a driving type, drilling by a boring machine or the like as in the above-mentioned construction using the conventional insertion-enlarged anchor member is completely unnecessary. Labor saving can be achieved, and construction costs can be reduced in this aspect as well.

(4) In the case of the conventional insertion-enlarged anchor member, the hole wall collapses in a soil state that is easily collapsed, and it becomes difficult to insert the anchor member, or a situation in which drilling needs to be performed again. However, according to the present invention employing the driving method, there is an advantage that such a problem does not occur and the method can be adopted regardless of soil properties.

(5) Also, with the conventional insertion-expansion-type anchor member in which the distal end portion is enlarged by pulling the inner tube, only a single-step enlarged portion can be formed. The part is provided in a plurality of stages, and the anchor piece of the anchor tube portion located on the front side,
By making the rigidity of the central portion of the anchor piece in the front-rear direction small so as to easily cause the mountain-shaped bending deformation, the anchor piece can be configured to be sequentially enlarged from the anchor tubular portion located on the front side. Therefore, according to the present invention, it is possible to form an anchor body enlarged in a plurality of stages, and to exert a large pull-out resistance. In the case where the anchor tube portions are provided in a plurality of stages as described above, if the anchor tube portion located on the rear side expands faster than the anchor tube portion located on the front side, the anchor piece according to the anchor tube portion located on the front side Although the anchor body formed by the bending of the body becomes a resistance, and the advancement of the outer tube becomes difficult, the present invention is configured so that the anchor tube part is sequentially enlarged from the anchor tube portion located on the front side. Can be formed without difficulty.

(6) By bending the anchor piece slightly outward with a substantially central portion in the front-rear direction as a boundary, it is possible to ensure a mountain-shaped bending with a substantially central portion in the front-rear direction as a boundary.
Further, by forming the center portion to be thin by providing a concave groove in the circumferential direction of the anchor tube portion, the angle-shaped bending can be further ensured.

(7) When the rear portion of the inner tube is slightly protruded from the rear end of the outer tube, and a through hole is provided in the protruding portion in a direction crossing the axis of the inner tube, the anchor member is driven into the rear portion as required. The rear end of the outer tube can be pushed forward by pushing the rear end of the outer tube forward with both ends of the stopper member inserted through the through-hole preventing the inner tube from moving forward. Enlargement of the body can be easily performed.

(8) When a screw hole is provided in the rear end portion of the inner tube in the axial direction thereof, a protection bolt is screwed into the screw hole to receive an impact when driving the anchor member with the protection bolt. Therefore, it is possible to prevent the inner pipe from being damaged by an impact or the like at the time of driving.

(9) In particular, when the tubular tubular member is previously covered with the anchor tubular portion, when the anchor member is bent in a mountain shape and the anchor body is enlarged and formed, the distance between the adjacent bent anchor members is increased. Since the danger of a large earth mass entering the anchor body through the opening of the anchor body can be prevented by the reticulated body expanded in a bag shape, the strength of the bulb-shaped mass formed by injecting grout into the anchor body can be maintained at a high level.

[Brief description of the drawings]

FIG. 1 is a side view showing a drive-in type anchor member according to the present invention.

FIG. 2 is a partial perspective view thereof.

FIG. 3 is an exploded perspective view thereof.

FIG. 4 is a perspective view showing a state where an anchor body is formed.

FIG. 5 is a perspective view illustrating an apparatus for driving an anchor member and enlarging an anchor body.

FIG. 6 is a side view illustrating a process of starting driving of the anchor member.

FIG. 7 is a sectional view showing a state in which an auxiliary tool is attached to a rear portion of the anchor member.

FIG. 8 is a side view showing a rear portion of the anchor member in a driving completed state.

FIG. 9 is a side view for explaining a process for enlarging the anchor cylinder.

FIG. 10 is a sectional view showing a rear side portion.

FIG. 11 is a side view showing a state where the anchor tube portion at the front end is enlarged.

FIG. 12 is a side view showing a state where an intermediate anchor cylinder is enlarged.

FIG. 13 is a side view showing a state in which the anchor tube portion at the rear end is enlarged.

FIG. 14 is a perspective view showing an extension pipe used to enlarge the anchor cylinder.

FIG. 15 is a cross-sectional view showing a rear portion of the state where the first and second stages of the anchor tube portions are enlarged.

FIG. 16 is a cross-sectional view showing a state in which an extension tube is attached to enlarge the anchor tube portion at the rear end.

FIG. 17 is a cross-sectional view showing a rear side portion in a state where the anchor tube portion at the rear end is enlarged.

FIG. 18 is a side view showing a grout injection state after all the anchor cylinder portions are enlarged.

FIG. 19 is a perspective view showing a stair-shaped planting portion supported by the anchor member according to the present invention.

FIG. 20 is a cross-sectional view showing a state in which a column constituting the planting section shown in FIG. 19 is fixed by a fixed rod connected to a hammered-in anchor member.

FIG. 21 is a side view showing another embodiment of the anchor member.

FIG. 22 is a partial perspective view of the same.

FIG. 23 is a perspective view showing an enlarged state of the anchor tube portion.

FIG. 24 is a side view showing a state where the anchor member is driven.

FIG. 25 is a side view showing an enlarged state of the anchor tube portion.

FIG. 26 is a side view showing a state in which the back grout is injected by enlarging the anchor tube portion.

FIG. 27 is a perspective view showing a state in which the anchor tube is covered with a mesh.

FIG. 28 is a perspective view showing a state where the expanded mesh body covers the anchor body.

FIG. 29 is a cross-sectional view showing a folded intermediate portion of the net.

FIG. 30 is a partial perspective view showing a folded state of the mesh body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anchor member 5 Entry part 6 Inner pipe 7 Anchor cylinder part 9 Outer pipe 12 Through hole 13 Screw hole 14 Outflow hole 21 Slit 22 Anchor piece 23 Depressed groove 26 Outflow hole 30 Protective bolt 32 Auxiliary tool 33 Blind hole 41 Pressing rod 45 Length Hole 57 Stopper member 61 Extension pipe 71a Bulb-like mass 81 Cylindrical net-like body

Claims (9)

(57) [Claims] 1. A driving type anchor member in which an anchor body is expanded and formed in a state of being driven into the ground, and an inner pipe extending rearward projects from a rear end of an approaching portion which advances by driving. At the same time, the inner tube is inserted into the outer tube, and a portion on the front end side of the outer tube is an anchor tube portion, and the anchor tube portion has slits extending in the front-rear direction arranged in the circumferential direction. The portion between adjacent slits is formed as an anchor piece, and the rear end of the outer tube is pressed forward with the front end of the outer tube supported by the rear end of the entry portion, and the outer tube is pressed. By moving forward, it is possible to bend the respective anchor pieces outward in a chevron shape to expand and form the anchor body,
In addition, an outflow hole for injecting grout into a portion where the anchor body is formed is provided in the inner pipe, and is an enlarged type driven anchor member. 2. A plurality of the anchor tube portions are provided at predetermined intervals in the length direction of the outer tube, and constitute an anchor tube portion located on the front side as the outer tube is pressed and advanced as described above. The more anterior the anchor piece is, the more the center of the anchor piece in the front-rear direction is such that the angle-shaped bending deformation of the anchor piece to be generated occurs earlier than the angle-shaped bending deformation of the anchor piece constituting the anchor cylinder portion located on the rear side. 2. The enlarged driving type anchor member according to claim 1, wherein the rigidity of the portion is set small. 3. A plurality of the anchor tube portions are provided at predetermined intervals in the length direction of the outer tube, and constitute an anchor tube portion located on the front side as the outer tube is pushed forward as described above. Anchor piece located closer to the front side in the circumferential direction of the anchor cylinder portion, so that the angled bending deformation of the anchor piece to be performed occurs earlier than the angled bending deformation of the anchor piece constituting the anchor cylinder portion located on the rear side. 2. The enlarged driving type anchor member according to claim 1, wherein the width of the anchor is set small. 4. The anchor piece is slightly bent outward with a substantially central portion in the front-rear direction as a boundary, and as the outer tube is pushed forward as described above, the anchor piece is moved substantially in the front-rear direction. 4. The expansion type driving type anchor member according to claim 1, wherein the bending portion is bent outward in a mountain shape with a center portion as a boundary. 5. An enlarged driving type as claimed in claim 4, wherein said anchor piece is slightly bent outward with a substantially central portion in the front-rear direction as a boundary, and has a thin central portion. Anchor member. 6. The anchor piece is slightly bent outward at a substantially central portion in the front-rear direction, and a concave groove is provided on an outer surface of the central portion in a circumferential direction of the anchor tube portion. The expandable driving type anchor member according to claim 4. 7. A tubular net-like body which expands as the anchor piece bends in a mountain shape and can cover the entirety of the anchor body from the outside is placed on the anchor tubular part, and the front and rear of the net-like body The enlarged drive-in type anchor member according to any one of claims 1 to 6, wherein the end portions are fixed to the front and rear end portions of the anchor tube portion. 8. The rear part of the inner pipe slightly protrudes from the rear end of the outer pipe, and a through hole is provided in the rear part in a direction crossing the axis of the inner pipe. An expandable driving type anchor member according to any one of claims 1 to 7. 9. The enlarged punch according to claim 1, wherein a screw hole opening at the rear end is provided in a rear end portion of the inner pipe in an axial direction of the inner pipe. Built-in anchor member.