KR20160017007A - Multipurpose restrain apparatus and constructing method using the same - Google Patents

Multipurpose restrain apparatus and constructing method using the same Download PDF

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Publication number
KR20160017007A
KR20160017007A KR1020160009454A KR20160009454A KR20160017007A KR 20160017007 A KR20160017007 A KR 20160017007A KR 1020160009454 A KR1020160009454 A KR 1020160009454A KR 20160009454 A KR20160009454 A KR 20160009454A KR 20160017007 A KR20160017007 A KR 20160017007A
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KR
South Korea
Prior art keywords
support member
anchor head
tubular support
anchor
wedge
Prior art date
Application number
KR1020160009454A
Other languages
Korean (ko)
Inventor
조선명
김도형
배병도
최봉근
Original Assignee
지오텍엔지니어링 주식회사
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Priority to KR1020160009454A priority Critical patent/KR20160017007A/en
Publication of KR20160017007A publication Critical patent/KR20160017007A/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E02D5/801—Ground anchors driven by screwing
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/02—Retaining or protecting walls
    • E02D29/0225—Retaining or protecting walls comprising retention means in the backfill
    • E02D29/0233—Retaining or protecting walls comprising retention means in the backfill the retention means being anchors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/30—Miscellaneous comprising anchoring details

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The present invention relates to an anchor head for a ground anchor, comprising: a tubular support member disposed on a support plate to surround an anchor head of a ground anchor and having a structure in which an inner diameter gradually becomes narrower toward a front end; At least two fastening wedges inserted into the gap between the tubular support member and the anchor head so as to be divided from each other and tapered so as to be gradually thinner toward the front end; And a coupling member coupled to the tubular support member for transferring a tensile force provided from the retaining device to the tubular support member, wherein the tension wedge is pushed by the anchor, And a tensioning force is applied to the anchor head in a state of being tightened around the head.

Description

TECHNICAL FIELD [0001] The present invention relates to a multi-purpose re-tensioning device,

The present invention relates to a multipurpose re-tensioning apparatus and a method of constructing the same, and more particularly, to a multipurpose re-tensioning apparatus and a method of constructing a multipurpose re-tensioning apparatus used for reinforcement of a ground anchor provided for reinforcement of a ground, ≪ / RTI >

The ground anchor is a reinforcing structure used to prevent excessive displacement and collapse of the ground. Ground anchors are widely used for supporting and reinforcing various structures and retaining walls, and for preventing and stabilizing slopes.

In general, the ground anchor is used as a tensile material, such as a PS steel wire, a PS steel wire, and a PS steel rod, and is fixed by a cement paste or the like injected by a grouting method while being inserted into a ground, thereby providing a prestress.

As shown in FIG. 1, the ground anchor includes a tensile material 10 inserted into a ground, and an outer end portion of the tensile material 10 is anchored to a predetermined anchorage plate 20 exposed to the outside of the ground, And is connected to an anchor head (1). The length of the tensile material 10 is determined by a tensile force applied to the anchor head 1 so as to substantially eliminate friction with the ground to transmit the tensile force of the anchor head 1, And an anchor body B, which is a portion of the resistance body that transmits a signal to the anchor body B.

The ground anchor having the above-described structure is required to maintain tension of the tensile material because the residual tension of the tensile material is reduced due to relaxation of the tensile material, drying shrinkage of the concrete, deformation of the ground, .

In the re-tensioning operation for correcting the tension of the ground anchor, a re-tension device is screwed to a screw tap formed on the outer circumferential surface of the anchor head, and an anchor head and a tensile material are tensioned using a force device such as a jack And inserting the fixing wedge into the gap formed between the anchor head and the supporting plate.

However, in the above conventional re-tensioning method, only the re-tensioning device conforming to the standard of the anchor head in which the screw tab is formed needs to be used, which makes it difficult to design a general re-tensioning device.

In addition, the re-tensioning is performed after a long time, typically about 10 years, after the initial tension is applied, so that the screw tab of the anchor head is aged and can not be coupled with the retensioning device, And therefore a countermeasure against this problem is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a multi-purpose re-tensioning device having a structure in which a fastening force is applied to an anchor head and a construction method thereof.

According to an aspect of the present invention, there is provided an anchor head comprising: a tubular support member disposed on a support plate to surround an anchor head of a ground anchor, the tubular support member having an inner diameter gradually narrowed toward a front end; At least two fastening wedges inserted into the gap between the tubular support member and the anchor head so as to be divided from each other and tapered so as to be gradually thinner toward the front end; And a coupling member coupled to the tubular support member for transferring a tensile force provided from the retaining device to the tubular support member, wherein the tension wedge is pushed by the anchor, And a tensioning force is applied to the anchor head in a state of being tightened around the head.

It is preferable that the anchor head is formed of a rigid block having a rounded outer circumferential surface, and the tightening wedge has an arcuate body and is divided and arranged along the circumference of the anchor head.

Preferably, the fastening wedge may be divided into three portions along the periphery of the anchor head.

The multi-purpose re-tensioning device according to the present invention may further include a cover member for capping the tubular support member with the tightening wedge inserted in the tubular support member.

The coupling member may include a long bolt that is screwed to the center of the cover member and connected to the tubular support member, and a nut member fastened through a rear end of the long bolt to receive a tensile force from the retaining device.

Further comprising a support tube disposed on the support tube and arranged to be lifted onto the support plate while surrounding the tubular support member, wherein the retaining mechanism includes a tensioning member that is provided on the support tube and pushes the nut member when the plunger is advanced, It is preferable to include a jack.

According to another aspect of the present invention, there is provided a method of re-tensioning a ground anchor, the method comprising the steps of: (a) placing a tubular support member having a structure in which the inner diameter gradually narrows toward the front end so as to surround the anchor head of the ground anchor ; (b) having at least two fastening wedges tapered so as to be gradually thinner toward the front, thereby inserting into the gap between the tubular support member and the anchor head; (c) applying a tensioning force to the anchor head while pulling the tubular support member backward using a tension jack to tighten the tightening wedge around the anchor head; And (d) fixing a tension state by inserting a fixing wedge into a gap formed between the anchor head and the pressure plate by displacement of the anchor head.

In the step (b), the tightening wedge may be inserted into the anchor head so as to be divided along the periphery of the anchor head.

(B) capping the tubular support member with the cover member with the fastening wedge inserted into the tubular support member; And screwing an elongated bolt into the center of the cover member.

(C) installing a support tube on the platen to surround the tubular support member; Installing a tension jack on the support barrel; And tightening the nut member through a rear end of the long bolt, wherein the tension bolt and the tubular support member are pulled backward by applying a tensile force to the nut member using the tension jack.

According to the present invention, there is no need for a screw tab on the anchor head, and even if the anchor head is aged, the anchor head can be firmly held by the tightening force of the re-tensioning device.

In addition, the multi-purpose re-tensioning device according to the present invention has an advantage that it can be applied to an anchor head having various sizes and shapes for multipurpose because of its tapering structure and tightening wedge to obtain tightening force.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention. And should not be construed as limiting.
1 is a cross-sectional view schematically showing an example of construction of a general ground anchor.
2 is an exploded perspective view showing a main configuration of a multi-purpose re-tensioning device according to a preferred embodiment of the present invention.
3 is a cross-sectional view showing a configuration in which a multipurpose re-tensioning device according to a preferred embodiment of the present invention is applied to a re-tensioning construction.
4 to 10 are cross-sectional views illustrating a method of re-tensioning using a multi-purpose re-tensioning apparatus according to a preferred embodiment of the present invention.
11 is a plan view showing a state where a tightening wedge is inserted into a gap between the tubular support member and the anchor head.
12 is a plan view showing a state in which the tightening wedge is tightened around the anchor head by the backward movement of the tubular support member in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 2 is an exploded perspective view showing a main configuration of a multi-purpose re-tensioning apparatus 100 according to a preferred embodiment of the present invention, and FIG. 3 is an assembled cross-sectional view showing a configuration set at the time of re-tensioning.

2 and 3, a multi-purpose re-tensioning apparatus 100 according to a preferred embodiment of the present invention includes a tubular support member 110 disposed to surround an anchor head 1 of a ground anchor, A plurality of tightening wedges 120 inserted into the tubular support member 110, and coupling means connected to the tubular support member 110.

The anchor head 1 is a fixation port for supporting the end portion of the tensile material 10 inserted into the ground, and is formed of a rigid block having a rounded outer circumferential surface to have a substantially disc shape.

The tubular support member 110 is formed of a cylindrical metal body having a diameter larger than that of the anchor head 1 so that the anchor head 1 can be surrounded. The tubular support member (110) is provided with a tapered structure (112) so that its inner diameter gradually becomes narrower toward the front end.

The tightening wedge 120 is inserted into the gap (see G in FIG. 4) between the tubular support member 110 and the anchor head 1 in a divided manner to provide tightening force to the anchor head 1 during operation of the apparatus. The fastening wedge 120 has an arc-shaped cross section of a body, and a tapered structure 121 is formed so that the thickness gradually decreases toward the front end. An inner surface of the tightening wedge 120 is provided with a concavo-convex structure 122 for preventing frictional resistance upon contact with the anchor head 1 to prevent slippage. At this time, it is preferable that the concave and convex structure 122 is formed in a shape in which a plurality of stripe-shaped protrusions are formed at predetermined intervals while going in the height direction of the tightening wedge 120.

As shown in FIG. 11, the tightening wedge 120 is divided and disposed along at least two peripheries of the anchor head 1 with a predetermined clearance. Preferably, the tightening wedge 120 provides a stable and effective tightening function in three directions relative to the center of the anchor head 1 when the three anchoring wedges 120 are substantially equally spaced apart along the periphery of the anchor head 1 can do.

In the state where the tightening wedge 120 is inserted into the tubular support member 110, the upper opening of the tubular support member 110 is screwed and capped by the cover member 130.

The coupling means is connected to the tubular support member (110) to transmit a tensile force from the tension jack (300), which is a force device, to the tubular support member (110). Specifically, the coupling means includes a long bolt 140 screwed to a fastening hole provided at the center of the cover member 130 and connected to the tubular support member 110, and a long bolt 140 fastened through a rear end of the long bolt 140 And a nut member (150) that receives tension from the tension jack (300) upon operation of the apparatus.

The tension jack 300 is disposed on the support tube 200 which is placed on the support plate 20 and surrounds the tubular support member 110 to provide a tension force for lifting the anchor head 1 from the support plate 20. [

When the tension jack 300 is operated and the plunger 301 is advanced by the hydraulic pressure, the nut member 150 is pushed to apply the tensile force to the elongated bolt 140 and the tubular support member 110, The anchor head 1 is substantially integrated with the anchor head 1 in a state where the tightening wedge 120 is interposed therebetween and pulls the anchor head 1 away from the pressure plate 20. [

A re-tensioning method using the multi-purpose re-tensioning apparatus according to a preferred embodiment of the present invention will now be described with reference to FIGS. 4 to 10. FIG.

First, as shown in FIG. 4, the tubular support member 110 is disposed on the support plate 20 so as to surround the anchor head 1 of the ground anchor to be re-tensioned. A tapered structure 112 is formed on the inner surface of the tubular support member 110 so that the inner diameter gradually decreases toward the front end.

5, the tightening wedge 120 is inserted into the gap between the anchor head 1 and the tubular support member 110. As shown in Fig. At this time, the plurality of tightening wedges 120 are arranged so as to be divided with a slight clearance space therebetween. Each of the tightening wedges 120 has an arc-shaped cross-section of the body, and a tapered structure 121 is formed so that the thickness gradually decreases toward the front end.

6, the cover member 130 is fastened to the tubular support member 110 by using the screw 111 formed on the inner circumferential surface of the tubular support member 110, as shown in FIG. 6, after the tightening wedge 120 is completely inserted And the long bolt 140 is coupled to the screw hole 131 at the center of the cover member 130 as shown in Fig.

8, a support tube 200 is provided on the support plate 20 so as to surround the tubular support member 110 and the tension jack 300 is mounted on the support tube 200 as shown in FIG. And then the nut member 150 is fastened through the rear end of the long bolt 140.

When the tension jack 300 is operated in the state where the preparation for setting is completed as described above, the plunger 301 is advanced by the hydraulic pressure and the nut member 150 is pushed forward so that the long bolt 140, the tubular support member 110, A tensile force is applied to pull the head 1 backward collectively. At this time, the tubular support member 110 is substantially integrated with the anchor head 1 with the tightening wedge 120 interposed therebetween. The anchor head 1 is not released to the front of the tubular support member 110 due to the interaction between the tapered structure 112 formed on the inner surface of the tubular support member 110 and the tightening wedge 120, It is stably retained in the re-tension device under the re-tensioning condition in which the tensile force is applied.

When the tubular support member 110 is pulled backward by the tensile force, the plurality of tightening wedges 120 are tightly tightened around the anchor head 1 while switching from the state shown in Fig. 11 to the state shown in Fig. 12 .

As shown in FIG. 10, when the fixation wedge 160 having a predetermined shape is inserted into the gap formed between the anchor head 1 and the support plate 20 by the displacement of the anchor head 1, the re-tension state is fixed.

As described above, according to the present invention, re-tensioning can be performed while holding an anchor head by using tightening force of a re-tensioning device, and can be applied to an anchor head having various sizes and shapes.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

1: Anchor head 10: Tension material
20: support plate 110: tubular support member
112, 121: tapered structure 120: tightening wedge
130: cover member 140: long bolt
150: nut member 160: settlement wedge
200: Support tube 300: Tension jack

Claims (9)

In a re-tensioning apparatus used for re-tensioning a ground anchor,
A tubular support member disposed on the support plate so as to surround the anchor head of the ground anchor and having a structure in which the inner diameter is gradually reduced toward the front end;
At least two fastening wedges inserted into the gap between the tubular support member and the anchor head so as to be divided from each other and tapered so as to be gradually thinner toward the front end; And
And coupling means coupled to the tubular support member for transmitting a tensile force provided by the retainer to the tubular support member,
Wherein the tensioning force is applied to the anchor head in a state where the tightening wedge is tightened around the anchor head as the tubular support member is pulled back by the tensile force. The method according to claim 1,
Wherein the anchor head is a rigid block having a rounded outer peripheral surface,
Wherein the tightening wedge has an arcuate body and is divided and disposed along the periphery of the anchor head. 3. The method of claim 2,
Wherein the fastening wedge is divided into three parts along the circumference of the anchor head. The method according to claim 1,
And a cover member for capping the tubular support member with the tightening wedge inserted into the tubular support member,
The coupling means includes a long bolt which is screwed to the center of the cover member and connected to the tubular support member, and a nut member fastened through a rear end of the long bolt to receive a tensile force from the retaining device. Multi-purpose re-tensioning device. 5. The method of claim 4,
Further comprising: a support tube surrounding the tubular support member and disposed to be placed on the support plate;
Wherein the force applying device is a tension jack installed on the support tube and pulling the nut bolt backward by pushing the nut member when the plunger is advanced. In a method of re-tensioning a ground anchor,
(a) disposing a tubular support member having a structure gradually narrowing its inner diameter toward a front end so as to surround the anchor head of the ground anchor on the support plate;
(b) having at least two fastening wedges tapered so as to be gradually thinner toward the front, thereby inserting into the gap between the tubular support member and the anchor head;
(c) applying a tensioning force to the anchor head while pulling the tubular support member backward using a tension jack to tighten the tightening wedge around the anchor head; And
(d) fixing the re-tensioned state by inserting a fusing wedge into a gap formed between the anchor head and the backing plate by displacement of the anchor head. 7. The method of claim 6, wherein in step (b)
Wherein the fastening wedge is inserted into the anchor head so as to be divided along the periphery of the anchor head. 8. The method of claim 7, wherein in step (b)
Capping the tubular support member with the cover member in a state where the fastening wedge is inserted into the tubular support member; And
And screwing an elongated bolt into the center of the cover member. 9. The method of claim 8, wherein in step (c)
Providing a support tube on the platen to surround the tubular support member;
Installing a tension jack on the support barrel; And
And fastening the nut member through the rear end of the long bolt,
And applying tensile force to the nut member using the tension jack to pull the long bolt and the tubular support member backward.
KR1020160009454A 2016-01-26 2016-01-26 Multipurpose restrain apparatus and constructing method using the same KR20160017007A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200481040Y1 (en) * 2016-03-07 2016-08-04 김홍기 Testing and granting apparatus of tensile force for ground anchor
CN109295859A (en) * 2018-10-18 2019-02-01 柳州欧维姆机械股份有限公司 A kind of front fulcrum hangs the tensioning equipment and its stretch-draw construction method of blue construction
KR102079563B1 (en) * 2019-08-01 2020-02-20 평화지오텍 주식회사 Compression friction type anchor panel ground reinforcement system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200481040Y1 (en) * 2016-03-07 2016-08-04 김홍기 Testing and granting apparatus of tensile force for ground anchor
CN109295859A (en) * 2018-10-18 2019-02-01 柳州欧维姆机械股份有限公司 A kind of front fulcrum hangs the tensioning equipment and its stretch-draw construction method of blue construction
CN109295859B (en) * 2018-10-18 2023-12-19 柳州欧维姆机械股份有限公司 Tensioning device for front supporting point hanging construction and tensioning construction method thereof
KR102079563B1 (en) * 2019-08-01 2020-02-20 평화지오텍 주식회사 Compression friction type anchor panel ground reinforcement system

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