KR102118792B1 - Anchor type and tension type permanent anchor - Google Patents

Abstract

The present invention relates to an anchor type tension type permanent anchor, wherein the anchor type anchor type anchor is fixed to the structure, and an anchor type tension type permanent anchor is provided inside the perforation hole to transmit tension to the ground. A first load-bearing body positioned at the rear end of the fixing unit and engaging the anchor-type anchoring hole provided toward the bottom of the drilling hole; A plurality of fixed reinforcing bars provided in the direction of the front end portion of the fixing unit by combining each one end with an anchor type anchor; And a second inner body provided at an arbitrary position between the front end portion of the anchorage portion and the first lower body, and a PC steel wire and grout hose entering the anchorage portion, and a second inner body coupling the other end of the fixed reinforcing bar. It is characterized by realizing a stable anchoring force by securing a reinforced support method while being able to remove the PC stranded wire.

Description

Anchor type tension type permanent anchor {ANCHOR TYPE AND TENSION TYPE PERMANENT ANCHOR}

The present invention relates to an anchor type tension type permanent anchor, and more specifically, in constructing a permanent anchor constructed to settle civil and building structures on the ground, it is possible to remove the PC stranded wire by differentiating the anchoring structure of the anchoring part. It is related to technology to secure an enhanced support method.

In general, in order to fix civil and architectural structures on the ground, an anchor method is applied to apply tension to the ground by applying tension to high strength steel.

Anchors are divided into permanent anchors and temporary anchors depending on the period of use. Temporary anchors are used to temporarily reinforce temporary soil walls or ground, and permanent anchors are used to settle slopes and permanent structures.

Hypothetical anchors and permanent anchors differ somewhat in form and construction, but the basic structure and functions are almost the same. The construction of the anchor generally consists of an anchor head fixing the anchor to the structure, a free portion transferring the tensile force at the anchor head to the anchoring portion, and a anchoring portion transferring the tensile force of the free portion to the ground.

Anchors can be classified into acupressure type, friction type, and complex type according to the supporting method of the anchoring ground. Friction type is most commonly applied. The friction type anchor is an anchor supported by the frictional force between the grout and the ground, and is classified into a tension type and a compression type according to the way the grout is loaded.

The tension type anchor is a method in which a load is applied between the PC strand and the grout, and the compression type is equipped with an inner lower body in the anchoring section of the permanent anchor and combines the unbonded PC stranded wire to obtain the tensile force transmitted from the anchor head through the free section. It is delivered to the inner body to be secured in the settlement book.

As an example of a conventionally known tension type permanent anchor technology, Korean Patent Registration No. 10-0473789 discloses a technology related to a friction tension type permanent anchor. A friction tensile permanent anchor embedded permanently in the ground to transmit tensile force from the surface to the ground, and having a tendon that is integrated with grouting and transmits the tensile force from the surface to the ground through grouting, and the tendon twists the PC stranded wire The resin coating film is formed by coating a waterproof resin directly on the outside, and in the free field part of Tendon, the grouting inlet pipe is placed in the center, and PC stranded wires are placed side by side around it. It comprises a grouting injection tube is disposed in the center of the spacer and a PC strand is arranged at a predetermined distance from the grouting injection tube on the outer side of the spacer.

As another example, Korean Patent Registration No. 10-1502125 discloses a technique for a permanent anchor body using a PC stranded wire and a ground reinforcement method using the same.

A plurality of PC steel wires, a grout material injection pipe having a predetermined length and arranged side by side with the PC steel wires to inject grout material into the settlement section, a corrosion prevention pipe surrounding the PC steel wires and grout material injection pipes, and a corrosion prevention pipe inside Epoxy resin caps provided at the interface between the settlement section and the free field section of the settlement, a settling pipe formed on the outer circumferential surface and surrounding the anti-corrosion pipe of the settling section, and multiple PCs to be engaged with the rear end of the settling pipe A rear end fixing unit that fixes a steel wire and a grout injection pipe, a rear end fixing unit coupled to a rear end fixing unit, which is coupled to a rotating jet unit that ejects grout material to the outside, and a rear end fixing unit and a rotating jet unit, and is connected to the lower end of the settling pipe. And, to secure the permanent anchor body to the surrounding ground comprises a front reinforcement that is coupled to the upper end of the PC strand.

In addition, the permanent anchor body as described above is a step of drilling a target ground at a predetermined angle to form a perforated hole having a constant diameter, inserting a permanent anchor body into the perforated hole, and injecting the grout material of the inserted permanent anchor body Injecting the grout material into the corrosion-resistant pipe and the perforated hole through the pipe, and when the grout material is filled into the corrosion-resistant pipe and the perforated hole, cure the grout material, and then strain the upper part of the PC steel wire to tighten the upper part of the PC steel wire and tighten it with the tip reinforcement part. It is constructed to reinforce the ground after completing the construction.

Korean Registered Patent No. 10-0473789 (2005.03.10) Korean Registered Patent No. 10-1502125 (2015.03.25) Korean Registered Utility Model No. 20-0308362 (03.28.2003) Korean Registered Patent No. 10-1019013 (2011.03.04)

Permanent anchor to which the prior art as described above is applied is a straight line as shown in (a) or (b) of multiple strands of PC stranded wires across the entire length of the anchor from the anchor head to the free length through the anchor. It is arranged around the grout hose in the form of a mold and is fixed in the form of fixing the PC strand by using the grip at the fixing anchor at the rear end.

Therefore, the permanent anchor to which the prior art is applied has a disadvantage in that the tensile load is difficult to be uniformly distributed over the length of the fixing section when the PC strand is stretched, and the tensile load is concentrated only between the fixing fixture and the grout.

In the end, the prior art tension type permanent anchor causes cracks in the grout at the area where the tensile load is concentrated, causing corrosion of the PC strand due to the inflow of moisture, etc., and, in the case of the compression type permanent anchor, compression tension between the inner body and the grout This repetition implies a problem that the anchor force becomes unstable, such as an increase in the creep phenomenon in which the tensile load by the anchor gradually decreases.

In addition, even in the case of permanent anchors, it may be required to remove the PC stranded wire, which is a tensile material, depending on the site conditions such as structural changes and repairs, but in the case of the conventional permanent anchors, in order to transmit the maximum tensile load from the PC stranded wire to the grout or load-bearing body. It is configured to permanently fix the end of the PC steel wire to the fixing fixture using the grip, so there is a disadvantage that it cannot be removed.

Therefore, in the present invention, the invention was solved to solve the problems of the prior art as described above.

In the anchor-type tension type permanent anchor comprising an anchor head fixing an anchor to a structure and a free-hanging portion and a anchoring portion provided inside the perforation hole to transmit tensile force to the ground,

A first load-bearing body positioned at a rear end of the fixing unit and engaging an anchor-type anchoring hole provided toward the bottom of the drilling hole;

A plurality of fixing rebars coupled to each end of the anchor-type fastener and provided in the direction of a distal end of the fixing unit; And

It is provided at an arbitrary position between the front end portion of the fixing unit and the first lower body, and a PC steel wire and a grout hose entering the fixing unit, and a second inner body that couples the other end of the fixed reinforcing bar.

In addition, the anchor type fastener,

The rear end facing the bottom of the perforation hole is formed into a conical shape that curves the outer circumferential surface with the apex,

A plurality of first fixing portions formed on the inside of the anchor-type fastener to join one end of the fixed reinforcing bar,

It is formed so as to be outward in a streamline shape along the longitudinal direction from the outer circumferential surface of the anchor type fastener, but has a support protrusion that arranges a large number of rings around the center.

In addition, the second lower body,

A rotation unit that forms a plurality of through holes penetrating the line and rear end faces and combines PC stranded wires entering one side of the fixing unit to change the direction to a U-shape; And

And a second fixing part for joining the other ends of the fixed reinforcing bars by forming a plurality of through-holes penetrating the line and the rear end face at a position rotated by a certain angle around the center of the second lower body in the rotation part.

Therefore, it is possible to achieve the objective of securing a more stable support method by removing the PC stranded wire as necessary and securing a more robust support method and distributing the tensile load across the fixing part.

The present invention implements a fixing structure that connects a second inner body to be able to remove a PC steel wire and a first inner body to connect anchor anchors with fixed reinforcing bars, which is different from a straight or straight U-turn permanent anchor according to the prior art. An anchor type tension type permanent anchor is provided.

Therefore, the present invention is to distribute the tensile load evenly across the longitudinal direction of the fixing section by the first and second load bodies when the tension force acts on the PC steel wire, especially through the reinforced support method by anchor anchors. There is an advantage that can secure a more stable anchor force.

Therefore, the present invention is a problem in that the tensile load in the prior art is concentrated problems between the grout or the grout or the inner body and the grout. The effect of securing a stable anchor force is derived by significantly reducing the problem.

In addition, because the present invention does not need to introduce a configuration for permanently fixing the PC steel wire to the inner body, such as a conventional permanent anchor due to the structural advantage of the second inner body, if the structure of the structure and the removal of the PC steel wire in the process of repair is necessary Edo has an advantage that can be easily removed through the anchor head.

1 is a cross-sectional view schematically showing an anchor-type tensile permanent anchor according to the present invention.
Figure 2 is an enlarged cross-sectional view of the main portion of Figure 1;
Figure 3 is a schematic main part perspective view of the anchor-type tensile permanent anchor according to the present invention.
4 is a cross-sectional view taken along line AA of FIG. 2;
Fig. 5 is a sectional view taken along the line BB in Fig. 2;
6 is a cross-sectional view (a) of a 4-stranded line taken along line CC of FIG. 1 and a cross-sectional view (b) of a 6-stranded wire according to another embodiment.
Figure 7 is a cross-sectional view schematically showing a straight permanent anchor (a) and a straight u-turn permanent anchor (b) according to the prior art.

Hereinafter, the configuration and operation according to a preferred embodiment of the anchor type tension type permanent anchor of the present invention will be described in detail with reference to the accompanying drawings. In the following description, detailed descriptions of parts that can be easily implemented by those skilled in the art may be omitted.

1 is a cross-sectional view schematically showing an anchor type tension type permanent anchor according to the present invention, FIG. 2 is an enlarged cross-sectional view of main parts of FIG. 1, FIG. 3 is a schematic main part perspective view of an anchor type tension type permanent anchor according to the present invention, and FIG. 4 is Fig. 2 is a cross-sectional view taken along the line AA, Fig. 5 is a cross-sectional view taken along the line BB of Fig. 2, Fig. 6 is a cross-sectional view taken along the CC line of Fig. 1 (a) and a six-wire cross-sectional view according to another embodiment ( b), FIG. 7 shows a cross-sectional view schematically showing a flat type permanent anchor (a) and a straight u-turn type permanent anchor (b) according to the prior art.

Anchor-type tension type permanent anchors to which the technology of the present invention is applied constitutes permanent anchors that are constructed to settle civil and building structures on the ground. It is noted that it is related to a permanent anchor capable of removing 50) and securing a more strengthened support method.

Anchor type tension type permanent anchor of the present invention for this purpose is provided in the anchor head (20) for fixing the anchor to the structure, and provided in the inside of the perforation hole (10), the free ledger (30) and the anchorage (40) to transmit the tensile force to the ground An anchor-type tension type permanent anchor made of) and specifically, as follows.

As shown in FIG. 1, the permanent anchor of the present invention includes a PC strand 50 and a tip end of a grout hose at an anchor head 20 provided outside the perforation hole 10. The leading end of the PC strand 50 is fastened by using a support plate and a fixture through which a plurality of PC strands 50 pass, and is provided to be fixed to the ground around the entrance of the perforation hole 10. PC stranded wire 50 is configured to impart anticorrosive and anticorrosive functions by applying grease to PC stranded wire 50 in an unbonded PC stranded wire 50 and coating it with a PE hose.

Inside the perforation hole (10), the free extension portion (30) in which the free extension of the PC strand (50) is made, and the second lower body (130) coupled with the PC strand (50) inside the free extension (30) are fixed The first load-bearing body 110 and the anchor-type fastener 111, which are coupled to the second load-bearing body 130 through the reinforcing bar 120, are constituted to provide a fixing unit 40 that transmits a tensile load to the ground through a grout. do.

The first lower body 110 provided in the permanent anchor of the present invention is located at the rear end of the anchoring portion 40 and engages the anchor-type anchoring hole 111 provided toward the bottom of the drilling hole 10.

A fixed reinforcing bar which will be described later by forming a plurality of through holes symmetrically centered on the front end face of the first lower body 110 and communicating with the first fixing part 112 provided in the rear anchor type fixing device 111. It is configured to accommodate 120.

A plurality of annular projections are formed on the outer circumferential surface of the first load-bearing body 110 to maximize the attachment area with the grout to effectively transmit the tensile load to the grout.

The anchor-type fastener 111 is formed in a conical shape that curves the outer circumferential surface with the rear end toward the bottom of the perforation hole 10 as a vertex.

The present invention is a fixing structure for connecting the second lower body 130 and the first lower body 110 that combines the anchor type fixing device 111 with the fixed reinforcing bar 120 to be able to remove the PC steel wire 50. It has the main features to implement.

Therefore, the anchor-type anchoring tool 111 excludes the configuration of permanently fixing a fixed anchoring device as in the prior art between the second lower body 130 and the PC strand 50, and the second lower body 130 Rather than being configured to remove the PC strand 50, a stronger anchoring force to the grout and the ground through the configuration of connecting the first lower body 110 that couples the anchor-type anchorage 111 to the fixed reinforcing bar 120 It is provided to derive the function to ensure the.

The anchor-type fastener 111 is integrally provided with the first lower body 110, and a plurality of first fixing portions 112 are formed therein to accommodate one end of the fixed reinforcing bar 120, which will be described later. The first fixing portion 112 is provided with a predetermined fastening means to fix the fixed reinforcing bar 120 by a bolting fastening method.

On the outer circumferential surface of the anchor-type fixing tool 111, a plurality of support projections 113 formed so as to be outwardly streamlined along the longitudinal direction are provided in an annular arrangement of a plurality around the center.

The support projection 113 maximizes the attachment area of the anchor-type anchoring tool 111 and the grout to control the tensile load transmitted through the fixed reinforcing bar 120 from the second lower body 130 when the PC strand 50 is tensioned. 1 is provided to strengthen the fixing force of the inner body 110.

In the embodiment of the present invention, the support protrusion 113 is configured to be attached in a streamlined shape along the outer circumferential surface of the anchor type anchor 111, but further draws resistance, such as a shape spread radially from the apex of the anchor type anchor 111 toward the rear end. Reinforcing configurations will also be possible.

The fixed reinforcing bar 120 is coupled to the first fixing portion 112 of the anchor-type fastener 111, each end is provided in the direction of the front end of the fixing unit 40, the other end side is the second of the second lower body 130 It is coupled to the fixed portion 132 to transmit the tensile force.

The fixed reinforcing bar 120 is the first fixing portion 112 and the second fixing portion in a position to avoid the path of the PC strand 50 coupled to the rotation portion 131 of the second lower body 130 to be described later It is provided by being coupled to (132), and is provided with a plurality of both sides on the axis of the center of the first lower body 110 and the second lower body 130 to interconnect with each other. Accordingly, the tensile strength load is configured to act equally on both sides of the first load body 110 and the second load body 130 while excluding interference with the fixed reinforcing bar 120 when the tension or removal of the PC stranded wire 50 is performed. .

On the other hand, the second lower body 130 is provided at an arbitrary position between the front end portion of the fixing unit 40 and the first lower body 110, the PC strand 50 entering the settlement unit 40 and It is configured to combine the grout hose and the other end of the fixed reinforcing bar 120. The second load-bearing body 130 is configured to disperse the point of action of the tensile load in the longitudinal direction of the fusing unit 40 at a predetermined distance from the first load-bearing body 110.

The second lower body 130 has a rotation part 131 for coupling the PC steel wire 50 and a second fixing part 132 for coupling the fixed reinforcing bar 120, and it is possible to combine grout hoses and other members. Prepare an extra hole for. A plurality of annular projections are formed on the outer circumferential surface of the second inner lower body 130 to maximize the attachment area with the grout to effectively transmit tensile force to the grout.

The rotation unit 131 is formed by forming a plurality of through-holes penetrating the line and rear end faces of the second lower body 130 into the inlet and the outlet, and combining the PC stranded wire 50 entering the one side of the fixing unit 40 It is configured to be discharged by changing the direction to the U-shaped.

The second load-bearing body 130 may add the number in the fixing unit 40 in consideration of the size of the tensile load required according to the structure, and the rotation unit 131 also changes the direction of the PC steel wire 50 The number of rotations 131 may be increased by increasing the number of rotation parts 131 at positions avoided by the second fixing part 132 so as to increase the number of) from 4 strands as shown in FIG. Can be.

The second fixing part 132 is constant in the rotation part 131 about the center of the second lower body 130 to avoid the path of the PC strand 50 that is diverted from the rear end part of the rotation part 131. A plurality of through-holes penetrating the line and the rear end surface are formed at the angle-rotated position.

The second fixing portion 132 is positioned to correspond to the first fixing portion 112 in a straight line to couple the other end of the fixed reinforcing bar 120, and a predetermined fastening means inside the second fixing portion 132 It is provided to secure the fixed reinforcing bar 120 by bolting fastening method.

The first inner lower body 110 and the anchor-type fastener 111 having the first fixed portion 112, the second lower body 130 having the second fixed portion 132 and the rotation portion 131 are Each single component is injection molded, or left and right equally divided in the longitudinal direction for manufacturing convenience.

The use state of the anchor type tension type permanent anchor to which the technology of the present invention having the above-described configuration is applied will be schematically described. The following description is intended to illustrate the preferred embodiment of the present invention, so the present invention is not limited by the following examples, and it will be understood that various modifications may be provided within the scope of the present invention. .

Permanent anchor of the present invention, as in a normal tension type permanent anchor, a step of drilling a perforation hole 10 into a target ground, a step of inserting a permanent anchor into the perforation hole 10, and a perforation hole 10 through a grout hose. ) Through the step of injecting the grout, and curing the filled grout. Finally, the upper part of the PC strand 50 is tensioned at the anchor head 20 to fasten the ground to strengthen the ground. It is constructed.

When the tension force is applied to the PC strand 50, it is transferred to the second lower body 130 and the rotation part 131 of the anchorage part 40 through the free length part 30. The PC strand 50a entering the rotation unit 131 through the through hole formed in the front end surface of the second lower body 130 at one side of the settled portion 40 is a ⊃ shape at the rear end surface of the second lower body 130 It is switched to the other direction and discharged to the other side of the fixing unit 40 through the rotation unit 131 (50b), the tensile force acting on the PC strand 50 at the position of the switching unit to the second lower body 130 and grout It is transferred to the ground through which the anchor force is secured.

Meanwhile, as described above, the tensile force acting on the second lower body 130 is transmitted to the first lower body 110 through a plurality of fixed reinforcing bars 120 coupled to the second fixing member 132.

The fixed reinforcing bar 120 is connected to the first fixing portion 112 provided in the anchor-type anchoring hole 111 provided at the rear end of the first lower body 110 through a hole formed in the front end surface of the first lower body 110. In combination, the second lower body 130 and the first lower body 110 are interconnected, and the tensile force transmitted through the fixed reinforcing bar 120 is transferred from the corresponding position to the ground through the first lower body 110 and the grout. To secure anchor force.

That is, in the section except for the second load-bearing body 130, a tensile load transfer mechanism is implemented to transfer loads to the ground by attaching the PC steel wire 50 and the grout, but the second load-bearing body 130 is a PC steel wire The first load-bearing body 110 and the anchor-type fastener 111 that transmit the tensile load by 50 and receive the tensile load through the fixed reinforcing bar 120 have a mechanism for forming a fixing structure that strengthens the ground fixing force. Implement it.

Therefore, the present invention does not introduce a configuration for permanently fixing the PC strand 50 to the inner casing like the conventional permanent anchor in the second lower casing 130, for example, of the PC strand 50 during the process of changing and repairing the structure. When removal is required, the anchor strand 20 can be easily towed by removing the PC strand 50 from the anchorage, and the agent receiving the tensile force from the second lower body 130 via the fixed reinforcing bar 120 1 In the lower body 110 and the anchor-type anchorage 111, an effect of securing a more reinforced support method for the grout and the ground is derived.

In addition, the present invention significantly reduces the problems caused by the tensile load caused by the PC stranded wire in the prior art only concentratedly between the anchoring body and the inner body and the grout, and the first inner body 110 and the anchor-type anchoring body 111 and , It has a variety of advantages, such as securing a stable anchor force by dispersing the action point of the tensile load through the second load-bearing body 130, it is expected that the industrial applicability is very large.

10: sky hole
20: anchor head
30: free ledger
40: Settlement Book
50: PC stranded wire
110: first lower body
111: anchor anchor
112: First Government
113: projection
120: fixed rebar
130: second lower body
131: rotation
132: Second Government

Claims (3)

In the anchor-type tension type permanent anchor consisting of an anchor head (20) for fixing an anchor to a structure and a free length portion (30) and a fixing length portion (40) provided inside the perforation hole (10) to transmit tensile force to the ground,
A first lower body body 110 which is located at the rear end of the anchoring portion 40 and engages the anchor-type anchoring hole 111 provided toward the bottom of the perforation hole 10,
A plurality of fixed reinforcing bars that combine the one end of the anchor-type fastener 111 in the direction of the front end portion of the fixing unit 40 and are coupled to the second lower body 130 to transmit tensile force to the first lower body 110. (120),
It is provided at an arbitrary position between the front end portion of the anchoring portion 40 and the first lower body 110, and the PC strand 50 and the grout hose entering the anchoring portion 40, and the fixed reinforcing bar 120 It includes a second lower body 130 that combines the other end,
The anchor type fastener 111,
The rear end toward the bottom of the perforation hole 10 is formed into a conical shape that curves the outer circumferential surface with a vertex,
A plurality of first fixing portions 112 formed inside the anchor-type fixing holes 111 to receive and join one end of the fixed reinforcing bar 120,
It is formed so as to be outward in a streamline shape along the longitudinal direction from the outer circumferential surface of the anchor-type fastener (111), and has a support protrusion (113) for arranging a large number of rings around the center,
The second lower body 130,
It forms a plurality of through holes penetrating the line and rear end faces, accommodates the PC stranded wire 50 entering the one side of the anchoring part 40, and changes the direction to the U-shaped to pull the PC stranded wire 50 from the anchor head 20 Rotation unit 131 to be coupled to remove by,
In the rotation part 131, a plurality of through holes penetrating the line and the rear end face are formed at a position rotated by a certain angle around the center of the second lower body 130 to accommodate the other end of the fixed reinforcing bar 120 and the PC stranded wire The second fixing part 132 is coupled to transmit the tensile load from the second load body 130 to the first load body 110 while excluding interference with the fixed reinforcing bar 120 when tension or removal is performed. Anchor type tension type permanent anchor, characterized in that. delete delete

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