KR20160066766A

KR20160066766A - Frictional combined ground anchor

Info

Publication number: KR20160066766A
Application number: KR1020140171939A
Authority: KR
Inventors: 신종덕
Original assignee: (주)대영
Priority date: 2014-12-03
Filing date: 2014-12-03
Publication date: 2016-06-13

Abstract

The present invention relates to a frictional composite ground anchor capable of extending bond length thereof by constructing a compression type prestressing strand only by a compression anchor body in accordance with geological features of a site by applying a tensile prestressing strand selectively in a detachable structure as to the compression anchor body in accordance with the condition of the geological features, or extending the tensile prestressing strand further in the longitudinal direction in the compression anchor body. The frictional composite ground anchor of the present invention includes: the compression type prestressing strand installed in a longitudinal direction in a punched hole on the ground; the compression anchor body prepared at the front end of the compression type prestressing strand; the tensile anchor body separably connected to the compression anchor body; and the tensile prestressing strand extended from the tensile anchor body.

Description

Friction type composite ground anchor {FRICTIONAL COMBINED GROUND ANCHOR}

The present invention relates to a ground anchor, and more particularly, to a ground anchor, and more particularly, to a ground anchor, a structure in which a tensile type strand is selectively detachably attached to a compression anchor body according to a geological condition at a construction site, The present invention relates to a friction type composite ground anchor capable of extending only a stranded wire or extending a tensile type stranded wire along a longitudinal direction thereof in a compression type anchor body and extending a length of the fixed length.

In general, the anchor method is to fix the civil engineering and constructional structures to the ground. After connecting with a high strength strand such as a stranded wire, a high tensile force is introduced to the stranded strand and a constraining force or a preload stress and so on to protect or stabilize the structure from excessive stress, deformation, displacement, and the like.

The anchor used in such an anchor method has the effect of tying the ground and the structure into one aggregate, which is generally composed of a steel wire and a cement grout. Anchors are used in various fields such as foundation guard walls, permanent anchor walls, transmission tower bases, dam reinforcement, buoyancy anchors of underground structures, and slope reinforcement.

The anchors are classified into rock anchors and ground anchors according to the type of the applied ground. The anchors are classified into friction anchors, pneumatic anchors and composite anchors according to the supporting method of the anchorage ground, Are subdivided into a tensile anchor and a compression anchor.

The tensile type anchor is to transmit the tensile force of the stranded wire by the adhesive force of the stranded wire and the grout without being covered with the tensile force applied to the grout due to the load applied to the grout to the ground and the opposite directional force against the tensile force of the stranded wire. . The compressive anchor is used to transmit the tensile force of a stranded wire by using a load transfer body (inner bottom body), and a load for tensioning the grout from the tip of the inner bottom body through the fixing station and a force in the opposite direction against the tensile force, As shown in Fig.

A composite type ground anchor for doubling the merits of a compression type anchor and a tension type anchor in such a friction type anchor is disclosed in the patent document (KR 10-0729667) of the prior art.

The composite type ground anchor of the above patent document has a configuration in which a compression anchor and a tension anchor are formed through a partitioning support and a connecting portion of the center portion including the partitioning support is integrated with a protective pipe.

These composite type ground anchors are able to simultaneously obtain the tensile force generated by the adhesive force between the stranded wire and the grout and the compressive force generated by the pulling of the stranded wire by the load transfer body (inner lower body) Of the total area.

However, in the above-mentioned prior art documents, the wedge is pressed and fixed to the end of the strand, the male thread is to be formed on the main surface of the wedge, and the stranded wire is passed through from both sides of the split base, There is a problem that the assembling operation is troublesome and the number of operations is too much to improve the efficiency of the assembling work.

Further, there is a disadvantage in that the process of machining the male thread on the outer peripheral surface of the wedge after the wedge is pressed and fixed to the end of the strand is cumbersome and the number of the troublesome operations is too many due to the excessive number of operations per one composite type ground anchor unit .

Particularly, due to the structural characteristics of holding the stranded wire, the wedge is inevitably composed of a split body, which exposes the grout to the outside, and the grout that is filled in the outside easily penetrates into the gap between the wedge and the strand, And when the grout penetrates between the divided wedges, the wedge can not be lifted and the strand can not be squeezed or grasped securely. As a result, when the strand is pulled, the strand can easily fall off from the center hole between the split bodies So that it is not possible to give proper tension force as a ground anchor.

Since a steel pipe or a spring forming a compression anchor is integrated with a protective pipe by a resin on one side of the partition plate, it is impossible to assemble the tension anchor on a construction site to the compression type anchor according to the geology of the construction site , And thus it is difficult to actively cope with various geological conditions.

For example, although a sufficient anchor force can be obtained even if a compression anchor is used without a tensile anchor or a protective pipe in a hard ground such as a rock or weathered soil, a tensile anchor and a compression anchor are integrated by a protective pipe, The tension anchor can not be separated, and the waste of resources is serious.

KR 10-0729667 B1 (Registered on June 12, 2007)

The present invention has been developed to overcome the above-mentioned drawbacks of the prior art, and it is an object of the present invention to provide an anchor body which can be selectively detached and attached to a compression type anchor body according to lipid conditions, The present invention provides a friction type composite ground anchor capable of securing a sufficient anchor force in accordance with various geological conditions as well as greatly improving it.

Further, the present invention is characterized in that the sheath end portion outside the compression type strand is sealed by the compression type anchor body and the air-bearing type splice member, the grip is securely gripped and fixed to the end portion of the compression type strand, A friction type composite ground so that the grip of the compression type strand can be combined with the compression type anchor body in a very stable state and the compression type strand can be prevented from being released when the compression type strand is pulled, The purpose is to provide an anchor.

According to an aspect of the present invention, there is provided a friction type composite ground anchor comprising: a compression type stranded wire provided in a longitudinal direction in a perforation of a ground; a compression type anchor body provided at a tip of the compression type strand; And a tensile type strand extending from the tensile type anchor body.

A grip is fixed to the tip of the compression type strand, and the grip is hermetically coupled to the inside of the compression type anchor body.

Wherein the compression anchor body has a first body to which a grip of a compression strand is coupled and a second body that is releasably coupled to the first body, And has a space.

And the first body has an insertion hole through which the compression type stranded wire passes, and a portion of the first body adjacent to the insertion hole is formed with a latching jaw which is engaged with the grip of the compression type stranded wire.

The tensile-type anchor body has an insertion hole through which the tensile-type strand is passed, and a portion of the tensile-type anchor body adjacent to the insertion hole is formed with a latching jaw which is engaged with the grip of the tensile-type strand.

In addition, the tensile-type anchor body may be constructed in a state in which the steel wires of the tensile-type stranded wire without the grips are not tied to the portions other than the grip portions clamped and fixed to the tensile-type strand, that is, .

Wherein the tension anchor body and the compression anchor body are provided with a connecting protrusion and a connecting hole corresponding to each other, and the connecting protrusion and the connecting hole are mutually separable, And is detachably connected to the main body.

A grout injection unit for injecting grout is communicably connected to the compression anchor body and the tension anchor body, and the grouting unit includes a grout injection pipe connected to the compression anchor body, A grout connection pipe communicably connecting the center portion and the center portion of the tension anchor body, and a grout discharge pipe connected to the tension anchor body.

Wherein the fixing anchor member is detachably coupled to the compression anchor body, and the fixing anchor member has a spring structure in which a spring element wire is wound in a coil shape at a constant pitch.

Wherein the fixing anchor member is detachably coupled to the compression anchor body, and the fixing assistant member has a corrugated pipe structure having a plurality of through holes.

The tension anchor body is provided with a protective pipe separating the periphery of the tensile type strand, and the protective pipe has a plurality of discharge holes through which the grout is discharged.

According to the present invention, it is possible to vary the bond length in various ways by applying the tensile anchor body and the tensile type stranded wire selectively removably to the compression anchor body according to the lipid condition, There is an advantage that sufficient anchor force can be secured according to geological conditions.

Particularly, since the tension anchor body is connected to the compression anchor body, a compression force is applied to the grout by the compression anchor body and the compression strand, and a tensile force acts on the grout by the tension anchor body and the tension type strand. Therefore, the anchor force of the grout can be greatly enhanced due to the combined action of the compressive force and the tensile force.

Further, according to the present invention, since the end portion of the sheath outside the compression type strand is sealed by the compression type anchor body and the air-bearing type splice member, and the grip of the compression type strand is hermetically sealed in the compression type anchor body, It is possible to prevent the penetration of the grout through the grip, thereby reliably preventing the separation of the strand.

1 is a cross-sectional view showing a state in which a friction composite ground anchor according to an embodiment of the present invention is installed in a perforation of a ground.
Fig. 2 is an enlarged view of a portion indicated by an arrow A in Fig. 1 on an enlarged scale.
FIG. 3 is a view showing a state where the compression type anchor body and the tension type anchor body of the friction type composite ground anchor according to the present invention are separated.
FIG. 4 is a cross-sectional view illustrating a state in which a friction composite ground anchor according to another embodiment of the present invention is installed in a perforation of a ground.
5 is a cross-sectional view illustrating a state in which a friction type composite ground anchor according to another embodiment of the present invention is installed in a perforation of a ground.
FIG. 6 is a view showing a state in which a tensile-type anchor body is detached and installed in a friction composite ground anchor according to the present invention.
Figure 7 is an illustration of an alternative configuration of Figure 6;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, the size, line thickness, and the like of the components shown in the drawings referred to in describing the present invention may be somewhat exaggerated for ease of understanding. The terms used in the description of the present invention are defined in consideration of the functions of the present invention, and thus may be changed depending on the user, the intention of the operator, customs, and the like. Therefore, the definition of this term should be based on the contents of this specification as a whole.

1 to 3 show a friction composite ground anchor according to an embodiment of the present invention.

1 to 3, the friction type composite ground anchor according to the present invention comprises at least one compression type strand 31 provided in the longitudinal direction in the perforation 1 of the ground, A tensile type anchor body 20 detachably connected to the compression type anchor body 10 and a tensile type stranded wire extending from the tensile type anchor body 20, (32).

The compression strand 31 is formed by twisting a plurality of steel wires, for example, seven strands of steel wire, and has a structure capable of providing a sufficient tensile force by applying a tensile force in the longitudinal direction. The compression strand 31 is provided in the perforation 1 of the ground so as to extend in the longitudinal direction from the ground toward the bottom (inner end) of the perforation 1. [

A grip 33 is provided at the tip of the compression type strand 31. The grip 33 is structured to compress the tip of the compression type strand 31 and is fixed firmly to the tip of the compression type strand 31. [ .

Particularly, the outer surface of the compression type strand 31 is covered with a synthetic resin sheath 31a. The sheath 31a can protect the compression type strand 31 from moisture or moisture have.

The tip end of the compression type strand 31 is connected to the compression type anchor body 10 through the grip 33. Since the compression type strand 31 is covered with the sheath 31a on the outer circumference of the compression type strand 31, Since the grout is not adhered to the outer circumferential surface of the strand 32, the strand 31 is unbonded in the perforation 1. When the compression type strand 31 is pulled from the outside of the ground in a state where the unbonded compression type strand 31 is restrained by the compression type anchor body 10, the tensile force of the compression type strand 31 is applied to the compression type anchor body 10, And is transmitted to the grout through the grooved portion 10, so that the load for tensioning the grout and the load in the opposite direction against the tensile force interact with each other to generate a compressive force in the grout.

2 and 3, the compression type anchor body 10 includes a first body 11 to which the tip of the compression type strand 31 is coupled, And a second body (12) detachably coupled to the second body (12).

The first body 11 has at least one insertion hole 11a and a locking protrusion 11b is formed at one side of the first body 11 adjacent to the insertion hole 11a. The remaining part of the compression type strand 31 is engaged with the insertion hole 33 of the first body 11 in a state where the grip 33 of the compression type strand 31 is engaged with the engagement step 11b of the first body 11, (Outer end of the perforation) of the ground.

A conical fitting hole 17 is formed on the other side of the first body 11 adjacent to the insertion hole 11a, that is, on the opposite side of the engaging protrusion 11b. The fitting hole 17 has a tapered surface A conical shim member 35 having a conical shape is fitted. A sheath 31a which is placed on the outside of the compression strand 31 is inserted into the center of the conical shim member 35 and the sheath 31a is inserted into the center of the conical shim member 35 in such a manner that the conical shim member 35 is inserted into the conical insertion hole 17 So that the sheath 31a can be more firmly and sealingly coupled to the first body 11 by being wedged. That is, the sheath 31a is fitted to the inner circumferential surface of the wedge-type fitting member 35, and the tapered surface, which is the outer circumferential surface of the wedge-shaped fitting member 35, is wedged into the conical fitting hole 17, It is possible to reliably prevent the grout from penetrating into the inside of the trenches 10.

The second body 12 has a receiving space 14 therein for receiving the grip 33 of the compressed strand 31 coupled with the first body 11. A tension anchor body 20 is detachably connected to one side of the second body 12 and the other side of the second body 12 is detachably coupled to one side of the first body 11. [

In addition, the second body 12 can be easily separated from the first body 11 by screwing the other inner surface of the second body 12 to one end of the first body 11. One end of the first body 11 protrudes toward the second body 12 and a male screw portion 13a is formed on the outer circumferential surface of the engaging portion 13. A female screw portion 12a is formed on the other inner surface of the second body 12 corresponding to the male screw portion 13a of the engaging portion 13. The male screw portion 13a of the engaging portion 13, The first body 11 and the second body 12 can be detachably coupled by detachably screwing the female threaded portion 12a of the second body 12 to the receiving space 15 The grip 33 of the compression type strand 31 can be hermetically coupled to the accommodating space 15 of the compression type anchor body 10.

A seal member 19 such as an O-ring is interposed between the engaging portion 13 of the first body 11 and the inner circumferential surface of the second body 12 to thereby engage the first body 11 and the second body 12 The receiving space 15 of the second body 12 closed by the coupling can be surely sealed against the outside. This ensures that the grout or the like can be prevented from penetrating into the receiving space 15 of the second body 12 and the tip of the compressed strand 31 is gripped by the first body 11 can be combined in a very stable state with respect to the locking tabs 11b of the compression type strand 31, so that an appropriate tension force can be given when the compression type strand 31 is pulled.

The tensile anchor body 20 has at least one insertion hole 20a through which the tensile strand 32 passes and a latching jaw 20b is formed adjacent to the insertion hole 20a.

Like the compression type strand, the tensile type strand 32 is formed by twisting seven strands of wire and has a structure capable of providing sufficient tensile force by applying tensile in the longitudinal direction.

The tensile strand 32 is connected to extend from the tensile anchor body 20 toward the inner end (bottom) of the perforation 1.

A grip 34 is provided at the end of the tensile strand 32. The grip 34 has a structure for pressing the end of the tensile strand 32 and is fastened securely to the end of the tensile strand 32. [ . After the grip 34 of the tensile strand 32 is engaged with the clamping jaw 20b the remaining portion of the tensile strand 32 passes through the insert hole 20a and reaches the bottom of the perforation 1 As shown in Fig.

Particularly, the engaging step 20b of the tension-type anchor body 20 and the engaging step 11b of the compression-type anchor body 10 are disposed at positions mutually opposing to each other, whereby the grip 33 of the compression type strand 31, The grips 34 of the stranded strand 32 can be disposed facing each other through the compressible anchor body 10 and the tensioned anchor body 20.

The tensile type strand 32 is provided in a non-coated state without covering with sheath or the like on the outer circumferential surface thereof and the grout is adhered to the outer circumferential surface of the tensile type strand 32, Lt; / RTI > When the compression type strand 31 is pulled to the ground side in the state where the uncoated tensile type strand 32 is bonded to the grout, the load pulling the grout to the outside of the ground and the load resistant to tension interact with each other, A tensile force is generated.

1, a plurality of tensile type stranded wires 32 can be provided extending from the tensile type anchor body 20 toward the bottom (inner end) of the perforation 1, and a plurality of tensile type stranded wires (32) can be adjusted radially away from each other by the spacer (39) after they are radially cohered by one or more fastening bands (38) in the middle portion thereof. As such, a plurality of tensile stranded wires 32 are radially spaced apart after being clamped by the clamping band 38 and the spacing member 39, whereby the grout is filled between the tensile stranded wires 32, The area where the tensile-type stranded wires 32 are in contact with the grout is further increased, and the fixability thereof can be greatly improved.

Particularly, the tension anchor body 20 is provided with the grip 34 without being tied to the portion excluding the grip 34 fixed to the tensile type strand 34, that is, the fastening band 38 and the spacer 39 The tensile steel strand 32 may be stretched over the whole or the entirety of the tensile strand 32 by spreading the seven strands thereon. As a result, the contact area between the plurality of steel wires of the tensile type strand 32 and the grout is further increased, and thus the tensile strength of the tensile type anchor body 20 There is an advantage that the fixability can be greatly improved.

The connecting protrusions 41 and the connecting holes 42 are formed to correspond to the portions where the tensile anchor body 20 and the compression anchor body 10 are adjacent to each other. The connecting protrusions 41 and the connecting holes 42 The tension-type anchor body 20 is detachably connected to the compression-type anchor body 10 by means of the detachable coupling of the anchor body 10 and the tension-type anchor body 20.

According to one embodiment, the connecting protrusion 41 extends from one side of the tensile anchor body 20, as shown in Figs. 1 to 3, and in particular, the connecting protrusion 41 is extended from the tensile anchor body 20 20 to the compression anchor body 10 by a predetermined length. The second body 12 of the compression anchor body 10 is formed with a coupling hole 42 through which the coupling protrusion 41 is detachably coupled. A male screw portion 41a is formed on the outer circumferential surface of the connecting projection 41 and a female screw portion 42a is formed on the inner circumferential surface of the connecting hole 42. [ As a result, the connection protrusion 41 of the tension anchor body 20 is detachably screwed to the connection hole 42 of the compression anchor body 10, so that the tension anchor body 20 is inserted into the compression anchor body 10). &Lt; / RTI >

The second body 12 of the compression anchor body 10 is fixed to the second body 12 so as to more reliably prevent the detachment of the connection protrusion 41 after the connection protrusion 41 is screwed to the connection hole 42. [ The screw 45 can be fastened and the lower end of the fixing screw 45 penetrates through the second body 12 to press the outer circumferential surface of the connecting protrusion 41 so that the connecting protrusion 41 contacts the connecting hole 42 The combined state can be maintained more firmly.

A sealing member 18 such as an O-ring may be provided between the outer circumferential surface of the connecting projection 41 and the inner circumferential surface of the connection hole 42. The sealing member 18 is used to receive the compression- The inflow of the grout or the like into the space 15 can be more reliably prevented.

According to an alternative configuration, although not shown in the drawing, the connection protrusion 41 is provided in the second body 12 of the compression anchor body 10, and the connection hole 42 is provided in the tension anchor body 20 Structure. That is, as long as the tensile anchor body 20 can be detachably connected to the compression anchor body 10 according to the state or condition of the lipid, the detachable coupling structure of the coupling protrusion 41 and the coupling hole 42 More design changes will be possible.

The compression anchor body 10 and the tension anchor body 20 are provided with grout injection units 60 for injecting grout. The grout injection unit 60 includes a grout injection pipe 61 connected to the compression anchor body 10 and a center portion of the compression anchor body 10 and a center portion of the tension anchor body 20 And a grout discharge pipe (65) connected to the tension anchor body (20).

The grout injection pipe 61 is tightly connected to the first body 11 of the compression anchor body 10 and the first body 11 of the compression anchor body 10 has a first grout connection A passage 62 is formed.

The first grout connection passage 62 is formed to penetrate the center of the compression anchor body 10 and grout injection pipe 61 and grout connection pipe 63 are formed at both ends of the first grout connection passage 62 Respectively. The grout connection pipe 63 is sealingly connected to one end of the first grout connection passage 62 and the other end of the second grout connection passage 62 is connected through a connection nipple 68 to the grout injection pipe 63. [ (61) are sealingly connected.

One end of the grout connection pipe 63 is tightly connected to the center of the tension anchor body 20 and the other end of the grout connection pipe 63 is connected to the center of the compression anchor body 10, (62) by screwing or the like.

One end of the grout connecting pipe 63 may be sealingly connected to the center of the tension anchor body 20 via one or more sealing members 67. Thereby, the grout connecting pipe 63 communicates very strongly with the first grout connecting passage 62 of the compression anchor body 10 and the second grout connecting passage 64 of the tension anchor body 20 It is possible to reliably prevent leakage of the grout during its injection.

1 to 3, a second grout connecting passage 64 is formed at the center of the connecting projection 21 of the tensile anchor body 20, and one end of the second grout connecting passage 64 The grout discharge pipe 65 is sealingly connected through the connection nipple 69 and one or more sealing members 67 are mounted on the inner circumferential surface of the other end of the second grout connection passage 64. [ The grout connecting pipe 63 can be sealingly connected to the other end of the second grout connecting passage 64 by the sealing material 67. [

A plurality of discharge holes 65a are formed on the outer circumferential surface of the grout discharge pipe 65 and grout is discharged through a plurality of discharge holes 65a to form a tension type strand 32, a tensile type anchor body 20, Type anchor body 10, a portion of the compression-type strand 31, and the like.

The grout injection pipe 61 and the grout discharge pipe 65 are connected to the first grout connection passage 62 of the compression anchor body 10, the grout connection pipe 63, The grout is detachably connected to the second grout connection passage 64 of the anchor body 20 so that the grout can be injected very stably through the center of the compression anchor body 10 and the center of the tension anchor body 20 There is an advantage.

The grout injection pipe 61 and the first grout connection passage 62 are hermetically connected by a connection nipple 68 and the first grout connection passage 62 and the grout connection pipe 63 are screwed The grout connecting pipe 63 and the second grout connecting passage 64 are sealingly connected by the sealing material 67 and the second grout connecting passage 62 and the grout discharging pipe 65 are sealed, Is hermetically connected by a connection nipple 69. As described above, the grout injection unit 60 has an advantage that the connection between the respective components is sealed so that leakage during grout injection is reliably prevented.

Particularly, the first grout connection passage 62 of the compression anchor body 10 and the second grout connection passage 64 of the tension anchor body 20 can be detachably connected by the grout connection pipe 63 So that the detachable connection of the compression anchor body 10 and the tension anchor body 20 can be made more smoothly.

The fixing assisting member 50 can be detachably coupled to the compression anchor body 10 and the fixing assisting member 50 can be detachably coupled with the fixing anchor body 10 And may be detachably coupled to the opposite side.

The fixing assisting member 50 is configured to surround a part of the compression type strand 31 connected to the compression type anchor body 10 in the outer diameter direction.

According to one embodiment, the fixing assisting member 50 has a spring structure in which a spring strand is wound in a coil shape at a constant pitch as shown in Figs. 1 to 4, and the other end of the compression anchor body 10 11b are formed on the side opposite to the first and second side walls 11a, 11b. Preferably, the outer peripheral surface of the coupling portion 16 is formed with a plurality of coupling grooves. The fixing assistant member 50 of the spring structure can be engaged with the engaging groove of the engaging portion 16 of the compression type anchor body 10 at one end thereof and the spring retainer 53, the fixing assisting member 50 of the spring structure is stably installed on the other side of the compression type anchor body 10.

The grout is filled between the coil springs of the fixing assisting member 50 in a coil shape to increase the area of adhesion with the grout, so that the compression type anchor body 10 can be fixed more stably and firmly.

According to another embodiment, the fixing assistant member 55 has a corrugated pipe structure having a plurality of through holes 55a as shown in FIG. 5, a fixing portion 57 is formed at one end of the fixing assistant member 55, An engaging portion 16 having a shape corresponding to the engaging portion 57 of the fixing assisting member 55 is formed on the opposite side of the engaging protrusion 11b on the other side of the compression type anchor body 10. The engaging portion 16 of the compression anchor body 10 may be formed by a round screw or a normal triangular screw having a shape corresponding to the inner surface of the corrugated tube of the fixing assistant member 55.

With such a configuration, the fixing assisting member 55 of the bellows structure is screwed to the engaging portion 16 of the compression-type anchor body 10 as shown in the enlarged view of Fig.

Alternatively, the fixing assistant member 55 may be formed of a plurality of through-holes, instead of the corrugated tube.

As described above, according to the present invention, since the fixing assisting member 50 surrounds the outer surface of the compressive strand 31 outside the compressible anchor body 10, it is possible to increase the contact force with the grout, 10) can be more firmly fixed to the grout.

1, 4 and 5, when a tensile-type anchor body 20 is connected to a compression-type anchor body 10 in a soft ground, tensile-type stranded wires connected to the tensile-type anchor body 20 The tensile type anchor body 20 and the tensile type strand 32 can be selectively attached to and detached from the compression type anchor body 10 as shown in FIG. Therefore, it is easy to adjust the length of the anchorage length, so that it is possible to secure sufficient anchorage force in accordance with the conditions of the geology.

Particularly, a compressive force acts on the grout by the compression type anchor body 10 and the compression type strand 31, and tensile force acts on the grout by the tensile type anchor body 20 and the tensile type strand 32, The anchor force can be greatly enhanced by the combination of the compressive force and the tensile force.

Specifically, it is difficult to secure a sufficient anchor force only in the compression anchor body 10 because it is difficult to secure a high-strength grout in the soft ground. However, by connecting the tension anchor body 20 to the compression anchor body 10 It is possible not only to extend the entire length of the fixing field by adding the length of the tensile-type strand 32, but also to provide the compression zone and the tensile zone at the same time, and to secure sufficient anchor force in the soft ground .

On the other hand, in the perforation 1 in the ground, which is likely to collapse, such as a sandstone layer and a tidal-flat layer, the surrounding of the tensile-type strand 32 is formed so as to stably protect the tensile-type anchor body 20, A protective pipe 70 may be installed.

The protective pipe 70 has a corrugated pipe structure in which one end thereof is closed, the other end thereof is opened, and a corrugated portion is formed on the side wall thereof. A plurality of discharge holes 71 are formed in the side wall of the protective pipe 70. Grout discharged through the grout discharge pipe 65 is discharged to the outside of the protective pipe 70 through the discharge holes 71 of the protective pipe 70 Can be discharged.

As shown in the enlarged view of FIG. 4, the open end of the protective pipe 70 and the corresponding tensile anchor body 20 are provided with engaging portions 78 and engaging portions 28, .

6, the tensile-type anchor body 20 can be sufficiently secured by the compressive force of the compressive-type anchor body 10 and the compressive-type strand 31. As a result, Anchor body 10, and the like.

6, when the tensile-type anchor body 20 is detached from the compression-type anchor body 10, a separate closing plug 81 is coupled to the connection hole 42 of the compression-type anchor body 10, 42 may be closed. In addition, the grout connection pipe 63 can be separated, and the grout injection pipe 61 can have a plurality of discharge holes 61a on the outer circumferential surface thereof. Thus, the grout injected through the grout injection pipe 61 The peripheral space of the compression anchor body 10 may be filled through the discharge hole 61a.

Alternatively, the grout injection pipe 61 connected to the center of the compression anchor body 10 is not used, but a separate grout injection pipe 66 shown in phantom in Fig. 6 is used as the compression anchor body 10, And the grout may be injected outside the compression-type strand 31. [

7, the closing plug 81 may further include a discharge hole 82 capable of discharging the grout, and the grout may be provided through the discharge hole 82 of the closing plug 81 And discharging it into the perforation (1).

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. .

10: Compression type anchor body 11: First body
12: Second body 20: Tension type anchor body
31: Compression type strand 32: Tensile type strand
41: connecting protrusion 42: connecting hole
50, 55: Fixing assistance member
60: grout injection unit 61: grout injection pipe
62: first grout connection passage 63: grout connection pipe
64: second grout connection passage 65: grout discharge pipe

Claims

Compression type stranded wire installed longitudinally in the perforation of the ground; A compression type anchor body provided at the tip of a compression type strand; A tension anchor body detachably connected to the compression anchor body; And a tensile strand extending from the tensile anchor body,
The tensioned anchor body is detachably attached to the compression anchor body by a detachable coupling of the coupling protrusion and the coupling hole, wherein the coupling anchor body and the compression anchor body are provided with a coupling protrusion and a coupling hole at portions adjacent to each other, Wherein the anchor is connected to the ground.

The method according to claim 1,
Wherein the grip is fixed to the tip of the compression type strand, and the grip is hermetically coupled to the inside of the compression type anchor body.

The method of claim 2,
Wherein the compression anchor body has a first body to which the grip of the compression strand is coupled and a second body that is releasably coupled to the first body, Wherein the anchor has a space.

The method of claim 3,
Wherein the first body has an insertion hole through which the compression type stranded wire passes, and a portion of the first body adjacent to the insertion hole is formed with a latching jaw which is engaged with the grip of the compression type stranded wire.

The method according to claim 1,
Wherein the pull-type anchor body has an insertion hole through which a tensile-type strand is passed, and a portion adjacent to the insertion hole is formed with a latching jaw that engages with the grip of the tensile-type strand.

The method according to claim 1 or 5,
The tensile type anchor body is constructed in such a manner that the steel wires of the tensile type stranded wire, in which the grips are not provided, are unfolded without being tied to the grip portions fixed to the tensile type stranded wire, Type composite ground anchor.

The method according to claim 1,
Wherein the compression anchor body and the tension anchor body are provided with grout injection units for injecting grout.