KR102021602B1 - Apparatus for re-providing tension for steel strand of ground anchor - Google Patents

Abstract

A strand wire retensioning device for ground anchors is disclosed. According to an aspect of the present invention, in the anchor anchor wire re-tensioning device for the ground anchor to re-tension the strand by lifting the anchor head fixed to the strand in the ground anchor and the O-ring groove is formed on the outer peripheral surface, the tension bell for holding the anchor head ; A hydraulic cylinder for lifting the tension bell from the structure in which the anchor head is seated; And a case seated on the structure to support the hydraulic cylinder, wherein the tension bell is formed of a pair of gripping pieces that are divided into hollow cylinders in a longitudinal direction, and the O-ring groove is formed on the lower inner circumferential surface of the gripping pieces. A gripping portion in which a semi-cyclic protrusion is inserted into it; A ring portion into which the gripping portion is inserted; A plurality of pressure bolts screwed through the ring part to press the grip part toward the anchor head; A bell portion formed on an inner circumferential surface of a female thread that engages with a male screw formed on an outer circumferential surface of the upper end of the grip portion; A tension bar coupled to an upper end of the bell part and lifted by the hydraulic cylinder; A plurality of wedge pieces which are in close contact with the outer circumferential surface of the anchor head, wherein the plurality of wedge pieces are connected to each other in series through a first spring; A disc portion to which the plurality of wedge pieces are slidably coupled to each other; And a second spring coupled to an inner circumferential surface of the bell portion to support the disc portion, and when the bell portion is screwed to the gripping portion, the plurality of wedge pieces are mutually formed by a tapered region formed on an inner circumferential surface of the gripping portion. In close contact with the outer circumferential surface of the anchor head, the first and second springs can be provided to the strand anchor re-tension device for the ground anchor characterized in that the tightly contact with the wedge piece.

Description

Steel wire retightening device for ground anchors {APPARATUS FOR RE-PROVIDING TENSION FOR STEEL STRAND OF GROUND ANCHOR}

The present invention relates to a strand anchoring device for ground anchors, and more particularly to a strand anchoring device for ground anchors that can be used to compensate for the reduced tensile force of the strands constituting the ground anchor.

Ground anchors are anchoring devices that are almost essential for civil engineering or building construction. For example, ground anchors can be used to fix structures, such as earthen walls, to prevent ground collapse on slopes or vertical surfaces formed by excavation. Can be.

Ground anchors generally comprise a tension member, for example a strand. The strand is fixed at both ends of the ground side and the retaining wall side in the state where the tensile force is applied, thereby pressing the retaining wall to the ground side can be in close contact.

However, the tensile force applied to the strand at the beginning of the construction of the ground anchor is gradually reduced due to the ground subsidence or soil loss that occurs continuously after a long time of construction, and thus the ground anchor can fully function. There was a problem of disappearing.

In order to solve this problem, the Republic of Korea Utility Model Publication No. 20-0481040 has been presented a tension force imparting device for the ground anchor to replenish the lowered tensile force by re-tensioning, that is, fixed after pulling back the strand. However, in the Republic of Korea Utility Model Publication No. 20-0481040, the pressing ring in the first casing must be assembled so as to be in close contact with the outer circumferential surface of the tension head so that the tension head can be properly gripped and the tensioning force of the strand can be smoothly performed. Of course, the damage of the pressing ring or the tension head can be prevented, but there is a problem that the pressing ring does not come into close contact with the outer circumferential surface of the tension head because there is no reliable fixing means between the tension head and the pressing ring.

Republic of Korea Patent Publication No. 10-1036013 (2011.05.23, lecture line re-tensioning device) Republic of Korea Utility Model Registration No. 20-0481040 (2016.08.04, Tensile force test and grant device for ground anchor)

Embodiments of the present invention can provide a strand anchor retightening device for a ground anchor that can be gripped and re-tensioned more stably than the anchor head fixed to the strand.

According to an aspect of the present invention, in the anchor anchor wire re-tensioning device for the ground anchor to re-tension the strand by lifting the anchor head fixed to the strand in the ground anchor and the O-ring groove is formed on the outer peripheral surface, the tension bell for holding the anchor head ; A hydraulic cylinder for lifting the tension bell from the structure in which the anchor head is seated; And a case seated on the structure to support the hydraulic cylinder, wherein the tension bell is formed of a pair of gripping pieces that are divided into hollow cylinders in a longitudinal direction, and the O-ring groove is formed on the lower inner circumferential surface of the gripping pieces. A gripping portion in which a semi-cyclic protrusion is inserted into it; A ring portion into which the gripping portion is inserted; A plurality of pressure bolts screwed through the ring part to press the grip part toward the anchor head; A bell portion formed on an inner circumferential surface of a female thread that engages with a male screw formed on an outer circumferential surface of the upper end of the grip portion; A tension bar coupled to an upper end of the bell part and lifted by the hydraulic cylinder; A plurality of wedge pieces which are in close contact with the outer circumferential surface of the anchor head, wherein the plurality of wedge pieces are connected to each other in series through a first spring; A disc portion to which the plurality of wedge pieces are slidably coupled to each other; And a second spring coupled to an inner circumferential surface of the bell portion to support the disc portion, and when the bell portion is screwed to the gripping portion, the plurality of wedge pieces are mutually formed by a tapered region formed on an inner circumferential surface of the gripping portion. In close contact with the outer circumferential surface of the anchor head, the first and second springs can be provided to the strand anchor re-tension device for the ground anchor characterized in that the tightly contact with the wedge piece.

The wedge portion may decrease in outer diameter downwardly corresponding to the tapered area of the grip portion.

The ring portion may have an inner diameter larger than the outer diameter of the gripping portion in a state in which the pair of gripping pieces are in close contact with each other, and may be applied to the anchor heads having various diameters.

The gap adjusting bolt is screwed to the side of the gripping piece to adjust the gap between the pair of gripping pieces.

The ring portion may further include a fixing portion for restraining the holding portion.

The fixing part, the locking groove is formed in a shape that the lower end is opened and the upper end is closed on the inner peripheral surface of the ring portion; And a locking pin protruding from an outer circumferential surface of the gripping piece and inserted into the locking groove.

The locking groove may be formed in a tracer shape.

The locking groove may include a guide groove having a lower end extending in an up and down direction; And a locking groove extending from the upper end of the guide groove in the circumferential direction of the ring portion.

According to embodiments of the present invention, the anchor head is first gripped by the gripping portion, and the anchor head is secondly gripped by the wedge portion, so that the anchor head can be more stably gripped and retensioned as compared with the conventional art. have. In particular, the outer circumferential surface of the anchor head, in order to protect the anchor head at ordinary times is formed in the O-ring groove that is coupled to the O-ring to prevent the gap between the anchor head cover and the anchor head cover, the projection to be inserted into the O-ring groove gripping portion It was formed in an annular shape on the inner circumferential surface.

1 is a view showing a ground anchor installed.
Figure 2 is a perspective view showing a strand wire re-tension apparatus for a ground anchor according to an embodiment of the present invention.
FIG. 3 is an exploded perspective view illustrating the strand wire retensioning device for the ground anchor of FIG. 2.
4 is a perspective view showing the grip portion.
5 is a front view illustrating the first holding piece and the second holding piece.
6 is a perspective view showing the bell portion.
7 and 8 are views schematically showing the operating principle of the strand anchor re-tension device for the ground anchor according to an embodiment of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present application, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components, unless specifically stated otherwise.

In addition, throughout the specification, "on" means to be located above or below the target portion, and does not necessarily mean to be located above the gravity direction.

In addition, the coupling does not only mean that the components are in direct contact with each other in the contact relationship between the components, but also other components are interposed between the components, The concept is to be used until the components are in contact with each other.

Since the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, the present invention is not necessarily limited to the illustrated.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

Hereinafter, a preferred embodiment of a strand anchoring device for a ground anchor according to the present invention will be described in detail with reference to the accompanying drawings, in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals. And duplicate description thereof will be omitted.

1 is a view showing a ground anchor installed.

Referring to FIG. 1, the ground anchor 10 is inserted into a boring hole formed in the ground 20 to be anchored by a grout, which is fixed by a grout, and an earthen wall covering an exposed surface of the ground 20. It may include an anchor head 11 seated on the structure 30, and a plurality of strands 13 fixed at both ends of the anchor body and the anchor head 11 in a state in which tension is applied.

An outer circumferential surface of the anchor head 11 may have an annular o-ring groove 12 formed therein, and the o-ring groove 12 may have an o-ring 17 for blocking a gap between the anchor head 11 and the anchor head cover 15. Can be combined.

Figure 2 is a perspective view showing a strand wire re-tension apparatus for a ground anchor according to an embodiment of the present invention.

Referring to FIG. 2, the strand anchor retightening device 40 for a ground anchor according to an embodiment of the present invention may include a tension bell 1000, a hydraulic cylinder 2000, and a case 3000.

The tension bell 1000 may be in close contact with the outer circumferential surface of the anchor head 11 to grip the anchor head 11.

The hydraulic cylinder 2000 may be seated on the upper surface of the case 3000 to lift the tension bell 1000 from the structure 30.

The case 3000 may be formed in a hollow cylinder shape in which a bottom surface seated on the structure 30 is opened, and a hydraulic cylinder 2000 may be seated on the top surface of the case 3000, and the inside of the case 3000 may be mounted. All or most of the major components of the tension bell 1000 may be disposed in the space. Unless otherwise described herein, the vertical division is regarded as being set along a direction perpendicular to the surface of the ground 20 or the structure 30, that is, along a normal direction.

FIG. 3 is an exploded perspective view illustrating the strand wire retensioning device for the ground anchor of FIG. 2.

Referring to FIG. 3, the tension bell 1000 includes a grip part 100, a ring part 200, a fixing part 300, a pressure bolt 400, a bell part 500, a tension bar 600, and a wedge part ( 700, a disc part 800, and a second spring 900.

4 is a perspective view showing a gripping portion, and FIG. 5 is a front view showing a first gripping piece and a second gripping piece.

4 and 5, the gripper 100 may include a pair of grip pieces 110 and 120.

The pair of gripping pieces 110 and 120 may be formed in a shape of dividing the vertically open hollow cylinder in the longitudinal direction. That is, each holding piece (110, 120) may be formed in a hollow semi-cylindrical shape of the top, bottom and one side open.

The semi-circular protrusion 111 and the tapered region 113 may be formed on the inner circumferential surface of the first gripping piece 110. The semi-circular protrusion 111 is formed to extend in the circumferential direction of the first gripping piece 110 so that the first gripping piece 110 comes into close contact with the outer circumferential surface of the anchor head 11. ) Can be inserted. The tapered region 113 may mean a region in which the inner diameter of the first gripping piece 110 decreases downward, and may be disposed above the semi-cyclic protrusion 111.

A male screw 115 may be formed on the outer circumferential surface of the first gripping piece 110 to be screwed to the bell portion 500.

A plurality of safety pins 117 may protrude from the lower outer circumferential surface of the first gripping piece 110. The safety pin 117 may prevent any fall of the ring portion 200 and prevent the ring portion 200 from damaging the structure 30 by colliding with the structure 30.

The spacer bolt 119 may be screwed to the side of the first gripping piece 110. The gap adjusting bolt 119 may adjust the gap between the first gripping piece 110 and the second gripping piece 120 by adjusting the protruding length. As a result, the gripper 100 can grip the anchor head 11 of various diameters.

The second gripping piece 120 may be formed in the same shape as the first gripping piece 120. That is, the semi-rigid protrusion 121, the tapered region 123, the male thread 125, and the safety pin 127 may also be formed on the second gripping piece 120, and the side surface of the second gripping piece 120 may be spaced apart. The adjusting bolt 129 may be screwed.

The ring portion 200 may prevent the pair of gripping pieces 110 and 120 from spreading with each other.

The ring portion 200 may be formed in a hollow cylindrical shape that is opened up and down, and the gripping portion 100 may be inserted into the ring portion 200.

The ring portion 200 may have an inner diameter larger than the outer diameter of the holding portion 100 in a state in which the pair of holding pieces 110 and 120 are in close contact with each other. As a result, the ring portion 200 may allow the gripping portion 100 to be held within a certain range by the space adjusting bolts 119 and 129 to grip the anchor head 11 of various diameters.

The fixing part 300 may restrict the vertical movement of the ring part 200 so that the position of the ring part 200 in the up and down direction is randomly changed to prevent the pair of holding pieces 110 and 120 from being mutually extended. have.

The fixing part 300 may include a locking groove 310 and a locking pin 320.

The locking groove 310 may be formed on the inner circumferential surface of the ring portion 200, and may include a guide groove 311 and a locking groove 313 to have a transitory shape. The guide groove 311 may be open at the lower end and may extend in the vertical direction, and the locking groove 313 may extend in the circumferential direction of the ring portion 200 at the upper end of the guide groove 311.

The locking pin 320 may protrude from the outer circumferential surface of the first gripping piece 110 or the second gripping piece 120.

The locking pin 320 may be inserted into the guide groove 311 by moving the ring portion 200 downward from the upper side of the grip portion 100, and the locking pin 320 may be positioned at the top of the guide groove 311. Rotating the ring portion 200 in the state can be inserted into the locking groove 313 to move. As a result, the position in the vertical direction of the ring portion 200 can be fixed.

The pressure bolt 400 may be screwed to the ring portion 200 to penetrate the ring portion 200.

The end of the pressing bolt 400 protrudes from the inner circumferential surface of the ring portion 200 to press the gripper 100, specifically, the first gripper 110 or the second gripper 120 toward the anchor head 11. The gripper 100 may be in close contact with the anchor head 11 more firmly.

The pressing bolt 400 may be disposed on the opposite side of the locking groove 310 based on the central axis of the ring portion 200 to prevent the locking pin 320 from being separated from the locking groove 310.

6 is a perspective view showing the bell portion.

Referring to FIG. 6, the bell part 500 may be formed in a bell shape with an open lower surface.

An internal thread 510 may be formed on the inner circumferential surface of the bell part 500 to be screwed to the gripping part 100. That is, the female screw 510 may engage the male threads 115 and 125.

The tension bar 600 may be coupled to an upper end of the bell part 500 to extend upward, and a nut 610 lifted by the hydraulic cylinder 2000 may be screwed to the upper end. An upper end of the tension bar 600 may extend through the hydraulic cylinder 2000 and the case 3000 to an upper side of the hydraulic cylinder 2000.

The wedge 700 may include a plurality of wedge pieces 710, 720, and 730 and a plurality of first springs 740, 750, and 760.

The plurality of wedge pieces 710, 720, and 730 may be serially connected to each other through a plurality of first springs 740, 750, and 760.

The wedge pieces 710, 720, and 730 may have an inner circumferential surface corresponding to the outer circumferential surface of the anchor head 11 to be in close contact with the outer circumferential surface of the anchor head 11, and may be in close contact with the inner circumferential surface of the grip portion 100. The outer peripheral surface of the shape corresponding to the tapered areas 113 and 123 of the holding pieces 110 and 120 may be provided. As a result, the thickness of the wedge pieces 710, 720, and 730 can be reduced downward, thereby reducing the outer diameter of the wedge portion 700 downward.

The wedge pieces 710, 720, and 730 may be coupled to the disc part 800 so as to be slidable. As an example, the sliding bolt 770 may be screwed to the upper surfaces of the wedge pieces 710, 720, and 730, and the sliding bolt 770 may be a guide hole formed by penetrating the disc part 800 in the vertical direction. 810 may be moved along. The guide hole 810 may be formed in a long hole shape.

The disc portion 800 may be formed of a circular annular plate.

Both ends of the second spring 900 may be coupled to the inner circumferential surface of the bell portion 500 and the disc portion 800 to support the disc portion 800.

7 and 8 are views schematically showing the operating principle of the strand anchor re-tension device for the ground anchor according to an embodiment of the present invention.

7 and 8, in the state in which the anchor head cover 15 and the O-ring 17 are separated from the anchor head 11, the pair of gripping pieces 110 and 120 are formed on the outer circumferential surface of the anchor head 11. After coupling the ring portion 200 in a state in close contact with the tightening bolt 400, screwing the bell portion 500 to the gripping portion 100, and when the tension bar 600 is coupled to the bell portion 500, Assembly of the tension bell 1000 may be completed. Next, when the hydraulic cylinder 2000 and the case 3000 are installed and the nut 610 is tightened, the installation of the strand wire retension device 40 may be completed. After the installation of the stranded wire tensioning device 40 is completed, the hydraulic cylinder 2000 may be supplied with hydraulic pressure to lift the nut 610, and thus the anchor head 11 gripped by the tension bell 1000. The stranded line 13 may be restrained by being lifted from the degree structure 30. Finally, when the horseshoe-shaped plate member (not shown) is inserted into the gap formed between the anchor head 11 and the structure 30, the strand wire 13 is re-tensioned even after removing the strand wire retightening device 40. Can be maintained.

As mentioned above, although preferred embodiment of this invention was described, the person of ordinary skill in the art should add, change, delete, add, etc. a component within the range which does not deviate from the idea of this invention described in a claim. The present invention may be modified and changed in various ways, which will also be included within the scope of the present invention.

10: ground anchor 11: anchor head
12: O-Ring Home 13: Lecture
15: Anchor head cover 17: O-ring
20: ground 30: structure
40: strand wire retension device 100: gripper
110: first gripping piece 111: semi-cyclic protrusion
113: taper area 115: male thread
117: safety pin 119: adjusting bolt
120: second gripping piece 121: semi-cyclic protrusions
123: Taper area 125: Male thread
127: safety pin 129: adjusting bolt
200: ring portion 300: fixed portion
310: jamming groove 311: guide groove
313: locking groove 320: locking pin
400: pressure bolt 500: bell portion
510: internal thread 600: tension bar
610: nut 700: wedge portion
710, 720, 730: wedges 740, 750, 760: first spring
770: sliding bolt 800: disc portion
810: guide hole 900: second spring
1000: tension bell 2000: hydraulic cylinder
3000: case

Claims (8)

In the anchor wire re-tensioning device for the ground anchor to re-tension the strand by lifting the anchor head fixed in the ground anchor and the O-ring groove is formed on the outer peripheral surface,
A tension bell for holding the anchor head;
A hydraulic cylinder for lifting the tension bell from the structure in which the anchor head is seated; And
A case seated on the structure to support the hydraulic cylinder,
The tension bell,
A gripping portion consisting of a pair of gripping pieces which are divided into hollow cylinders in a longitudinal direction, and having semi-cyclic protrusions inserted into the O-ring grooves on the lower inner circumferential surface of the gripping pieces;
A ring portion into which the gripping portion is inserted;
A plurality of pressure bolts screwed through the ring part to press the grip part toward the anchor head;
A bell portion formed on an inner circumferential surface of a female thread that engages with a male screw formed on an outer circumferential surface of the upper end of the grip portion;
A tension bar coupled to an upper end of the bell part and lifted by the hydraulic cylinder;
A plurality of wedge pieces which are in close contact with the outer circumferential surface of the anchor head, wherein the plurality of wedge pieces are connected to each other in series through a first spring;
A disc portion to which the plurality of wedge pieces are slidably coupled to each other; And
A second spring coupled to the inner circumferential surface of the bell part to support the disc part;
When the bell portion is screwed to the gripping portion, the plurality of wedge pieces are brought into close contact with the outer circumferential surface of the anchor head in close proximity to each other by a tapered area formed on the inner circumferential surface of the gripping portion, and the first spring and the second The spring is compressed to firmly adhere the wedge pieces,
The ring portion has an inner diameter larger than the outer diameter of the gripping portion in a state where the pair of gripping pieces are in close contact with each other, and is applicable to the anchor heads of various diameters.
A side anchoring wire retension device for a ground anchor, characterized in that the gap adjusting bolt is screwed to the side of the gripping piece to adjust the gap between the pair of gripping pieces.
The method of claim 1,
And the wedge portion decreases in outer diameter in a downward direction corresponding to a tapered area of the grip portion.
delete delete In the anchor wire re-tensioning device for the ground anchor to re-tension the strand by lifting the anchor head fixed in the ground anchor and the O-ring groove is formed on the outer peripheral surface,
A tension bell for holding the anchor head;
A hydraulic cylinder for lifting the tension bell from the structure in which the anchor head is seated; And
A case seated on the structure to support the hydraulic cylinder,
The tension bell,
A gripping portion consisting of a pair of gripping pieces which are divided into hollow cylinders in a longitudinal direction, and having semi-cyclic protrusions inserted into the O-ring grooves on the lower inner circumferential surface of the gripping pieces;
A ring portion into which the gripping portion is inserted;
A plurality of pressure bolts screwed through the ring part to press the grip part toward the anchor head;
A bell portion formed on an inner circumferential surface of a female thread that engages with a male screw formed on an outer circumferential surface of the upper end of the grip portion;
A tension bar coupled to an upper end of the bell part and lifted by the hydraulic cylinder;
A plurality of wedge pieces which are in close contact with the outer circumferential surface of the anchor head, wherein the plurality of wedge pieces are connected to each other in series through a first spring;
A disc portion to which the plurality of wedge pieces are slidably coupled to each other; And
A second spring coupled to the inner circumferential surface of the bell part to support the disc part;
When the bell portion is screwed to the gripping portion, the plurality of wedge pieces are brought into close contact with the outer circumferential surface of the anchor head in close proximity to each other by a tapered area formed on the inner circumferential surface of the gripping portion, and the first spring and the second The spring is compressed to firmly adhere the wedge pieces,
The wire anchor retension device for a ground anchor further including the fixing part which restrains the said collar part to the said holding part.
The method of claim 5,
The fixing portion,
A locking groove formed in a shape in which a lower end is opened and an upper end is closed on an inner circumferential surface of the ring part; And
A strand anchor retension device for a ground anchor that includes a locking pin protruding from an outer circumferential surface of the gripping piece and inserted into the locking groove.
The method of claim 6,
The hook wire retension device for ground anchors, characterized in that the engaging groove is formed in a translator shape.
The method of claim 6,
The locking groove,
A guide groove whose lower end is opened and extends in the vertical direction; And
A strand anchor retension device for a ground anchor comprising a locking groove extending in the circumferential direction of the ring portion at an upper end of the guide groove.

Images