KR102214174B1 - Anchor head unit for re-tensioning of strand wire and re-tensioning method of strand wire using the same - Google Patents

Abstract

The present invention relates to an anchor head unit for re-tensioning a strand and a method for re-tensioning a strand using the same.
The present invention is a ground anchor comprising a wedge unit and a stranded wire holder fastened to an end portion of a stranded wire at an entrance of a grouting hole so as to maintain a state in which a tensile force is applied to the stranded wire, wherein the stranded wire holder is a disc member having a diameter inserted into the inlet of the grouting hole. It is provided with a small stranded wire holder that penetrates the disc member and has several wedge unit holes for mounting the wedge unit to hold the stranded wire, and a fastening structure for fastening with a re-tensioning device on the outer peripheral surface. , By including a support member installed in the grouting hole to support this strand holder at a predetermined position at the entrance of the grouting hole while preventing it from being lowered downward, it is possible to align the strands in the grouting hole and reinstall the small strand holder. It can be usefully used in the field of re-tensioning the stranded wire with a tensile cylinder, which is one of the tensile means, by connecting a tensile bar to the stranded wire holder.

Description

Anchor head unit for re-tensioning of steel wire and re-tensioning method of wire using the same {ANCHOR HEAD UNIT FOR RE-TENSIONING OF STRAND WIRE AND RE-TENSIONING METHOD OF STRAND WIRE USING THE SAME}

The present invention relates to an anchor head unit for re-tensioning a strand and a method for re-tensioning a strand using the same, and more particularly, the strand and the wedge unit in the strand holder are corroded or damaged at the entrance of the grouting hole, so that the end of the strand is The present invention relates to an anchor head unit for re-tensioning a re-strength wire capable of re-tensioning a steel wire when located at an entrance portion of a grouting hole, and a re-tensioning method of a wire using the same.

In general, ground anchors drill a grouting hole of a predetermined depth into the ground to prevent the collapse of the ground slope or retaining wall during civil engineering or construction work, insert at least one strand of strand into the grouting hole, and then inject grout to cure. The ground is stabilized and reinforced by tensioning the stranded wire and applying a tensile force.

These ground anchors are supported by the strand holders so that the ends of the strands extending out of the ground from the grouting hole are gripped through each wedge unit.

The re-tension of the ground anchor constructed in this way is maintained in the state in which the tensile strength is applied by tensioning the stranded wire at the beginning of construction, but as time passes, the tensile strength naturally decreases due to the loss of soil and soil as well as the elongation of the strand. In addition, there have been cases in which the wedge unit is disassembled from the strand due to corrosion or damage to the strand and the wedge unit in the strand holder.

As described above, if the tensile strength of the strand is lowered or the wedge unit is dismantled, it cannot perform its function as a ground anchor. Therefore, the stranded strand of the ground anchor is re-stretched and supplemented.

Re-tensioning devices or methods for re-tensioning the strands are disclosed in relation to the re-tensioning of the ground anchor, but this is a brief explanation by extracting a re-tensioning device that can be said to be related to the applied invention. do.

In the Registered Utility Model No. 20-0481040 (hereinafter referred to as "document 1"), the ends of the strands that are fixed by the grout in the grouting hole and extend through the entrance of the grouting hole are held by the strand holder and the first wedge unit. However, there is provided a fixing unit in which the outer peripheral surface of the stranded wire holder is gripped by a crimping ring that is a second wedge unit and a first casing, and a second casing is fastened to the first casing, and a tension bar having one end fastened to the second casing. It was to re-tension the stranded wire by tensioning with a tension cylinder, which is one of the tensioning means.

Registered Patent No. 10-0949196 (hereinafter referred to as "document 2") states that the ends of the strands fixed by the grout in the grouting hole and extended through the entrance of the grouting hole are held by the strand holder and the wedge unit, Hold the outer locking-jaw of the holder so that it is caught by the gripping segment, and fasten one of the tension induction rod to the connector of the gripping segment, and then place a tension cylinder, which is one of the support plate and tensioning means, on the outside of the gripping segment, and then the tension induction rod. The strand was re-tensioned by tensioning with a tension cylinder.

In the re-tensioning device of the strands 1 and 2 as described above, if the strands are sufficiently extended together with the strands holder at the tip entrance of the grouting hole, there is no problem in re-tensioning the strands by using a re-tensioning device.

However, as the strands and wedge units are corroded or damaged, the wedge unit is separated and disassembled from the strands due to the tensile force applied to the strands, as well as the length of the strands are also contracted, so that the ends of the strands are often reduced to the entrance of the grouting hole.

If the end of the strand is reduced to the entrance of the grouting hole as above, the strand holder and wedge unit cannot be installed at the end of the strand, as well as the end of the strand cannot be gripped, so re-tensioning of the strand is impossible. There was a downside that the ground anchor had to be rebuilt around.

(Document 1) KR 20-0481040Y1 (Registered on July 29, 2016) (Document 2) KR 10-0949196B1 (registered on March 16, 2010)

The present invention has been researched and developed to solve the conventional closed end as described above, and a support member and a small strand holder are inserted and installed at the inner inlet of the grouting hole to align the strands, and tension by connecting a tension bar to the small strand holder. It is an object of the present invention to provide an anchor head unit for re-tensioning a stranded wire that can re-tension a stranded wire with a tensile cylinder, which is one of the means, and a method for re-tensioning the stranded wire using the same.

The anchor head unit for re-tensioning a stranded wire according to the present invention for solving the above-described problems includes a wedge unit and a stranded wire holder fastened to the end of the strand at the entrance of the grouting hole so that the strand is maintained in a state in which tensile force is applied to the stranded strand. In the ground anchor, the strand holder is provided with a disc member having a diameter inserted into the entrance of the grouting hole, and the strand is penetrated through the disc member, and several wedge unit holes for mounting the wedge unit to grip the strand are perforated. Includes a small-sized stranded wire holder provided with a fastening structure for fastening with a re-tensioning device on the outer circumferential surface, and a supporting member installed in the grouting hole to support the stranded wire holder while preventing it from being lowered downward from a predetermined position at the entrance of the grouting hole. It is composed by

In the anchor head unit for re-tensioning a stranded wire according to the present invention, the support member may be provided by protruding a washer-shaped disk and a plurality of blades bent obliquely upward on the outer peripheral surface of the disk.

In the anchor head unit for re-tensioning a stranded wire according to the present invention, the support member includes a disc having a plurality of strand holes for aligning the strands, and a plurality of blades bent upwardly to the outer peripheral surface of the disc. Can be prepared.

In the anchor head unit for re-tensioning the stranded wire according to the present invention, the supporting member aligns the strands to facilitate the installation of the strand holders, as many as the number of strands of stranded strands-a stranded strand guide with holes perforated, and the outer side of the stranded strands guide It is characterized in that a supportable elastic band is provided on the main surface while preventing the strand guide from descending along the grouting hole.

It is preferable that the strand-hole of the strand guide has a wide lower portion and narrows toward the upper portion to facilitate insertion and guidance of the strand.

The elastic band is provided as a seed-shaped ring with one cut in it, and is provided in an arc-shaped cross-sectional shape convex outward from the top and bottom toward the center.

The method of re-tensioning a steel wire using an anchor head unit for re-tensioning a steel wire according to the present invention is a wedge unit gripped by the steel wire due to corrosion or damage to the wire and wedge unit in the wire holder at the entrance of the grouting hole of the constructed ground anchor. When this is released and the end of the strand is located at the entrance of the grouting hole,

A support member installation step of inserting and installing a support member into the inner entrance portion of the grouting hole to align the strands in the grouting hole; A small strand holder installation step of placing a small strand holder on the support member, installing a wedge unit so that the strands pass through each of the wedge unit holes and hold the strand for each wedge unit hole; A connection socket, which is one end of the tension bar, is connected to the small strand holder, and a casing is installed on the acupressure plate to accommodate the strand holder even if the small strand holder falls outside the entrance of the grouting hole, and then passes through the casing and is drawn out. A re-tensioning device installation step of installing a tension cylinder, which is one of the tensioning means, on the casing so that the tensioned bar can be pulled; When the small strand holder is pulled out from the entrance of the grouting hole by operating the tension cylinder and pulling the tensile straight along with the small strand holder, the strand is re-stretched by interposing a supporting member into the space between the acupressure plate and the small strand holder. It characterized in that it comprises a step of re-tensioning the stranded wire.

According to the anchor head unit for re-tensioning the strands of the present invention and the method for re-tensioning the strands using the same, a support member and a small strand holder inserted into the inlet portion of the grouting hole are provided to align the strands in the grouting hole and The holder can be reinstalled, and there is a useful effect of re-tensioning the strand with a tensile cylinder, which is one of the tensile means, by connecting a tensile bar to the small strand holder.

In addition, the anchor head unit for re-tensioning the stranded wire according to the present invention and the re-tensioning method of the stranded wire using the same, are provided with a support member protruding a plurality of blades on the outer circumferential surface of the disc, so that the support member at the inner entrance of the grouting hole Of course, the small strand holder can be installed at any position in the grouting hole in a state that prevents it from going down the grouting hole, and as a result, the strand and the wedge unit in the strand holder are corroded or damaged at the entrance of the grouting hole of the constructed ground anchor. There is a useful effect of re-tensioning the stranded wire even when the wedge unit gripped in is released and the end of the strand is located at the entrance of the grouting hole.

In addition, the anchor head unit for re-tensioning the stranded wire according to the present invention and the method for re-tensioning the strand using the same, are provided with a support member having as many strands as the number of strands or a strand guide-hole to align strands in the grouting hole. It has a useful advantage of being able to easily reinstall the small stranded wire holder at the entrance of the grouting hole.

1 is a cross-sectional view of a state in which a strand is re-stretched by applying a strand re-tension anchor head unit according to an embodiment of the present invention.
2 is an exploded perspective view showing the exploded view of FIG. 1.
3 is a cross-sectional view showing a small strand holder and a support member, which are main parts of the strand re-tension anchor head unit according to the present invention.
4 is a perspective view showing another embodiment of a support member in the re-tensioning anchor head unit of a stranded wire according to the present invention.
5 and 6 are views showing a re-tensioning device for re-tensioning the stranded wire re-tensioning anchor head unit according to the present invention.
7 to 13 are views for explaining a re-tensioning process of a strand using an anchor head unit for re-tensioning a strand according to an embodiment of the present invention.
14 to 15 are views showing another embodiment of a support member in the re-tensioning anchor head unit of a stranded wire according to the present invention.
16 is a cross-sectional view of a state constructed by using another embodiment of a support member in the re-tensioning anchor head unit of a stranded wire according to the present invention.

Hereinafter, with reference to the accompanying drawings according to a preferred embodiment of the present invention will be described in detail. For reference, the size of the constituent elements shown in the drawings referred to in describing the present invention, the thickness of the line, etc. may be somewhat exaggerated for convenience of understanding. In addition, terms used in the description of the present invention are only defined in consideration of functions in the present invention and may vary according to user, operator intention, custom, and the like. Therefore, the definition of terms should be made based on the contents of the entire specification.

1 to 3 are views illustrating a strand re-tensioning anchor head unit according to an embodiment of the present invention.

As shown in the drawing, the re-tensioning anchor head unit of the stranded wire of the present invention has a support member 10 inserted into the inner inlet portion of the grouting hole 40 and buried in the grouting hole 40 to protrude to the ground. A small strand holder 20 installed together with the wedge unit 42 at one end of the extended strands 41, and installed in the acupressure plate 43 at the entrance of the grouting hole 40 to support the small strand holder 20 It is configured to include a support member 30.

The support member 10 includes a disc 11 having a plurality of strand holes 12 perforated for aligning the strands 41, and a plurality of blades 13 bent upwardly on the outer peripheral surface of the disc 11 Consists of The support member 10 is inserted into the strand hole 12 so that the strands 41 pass through each without twisting, and when inserted downward from the entrance of the grouting hole 40, it is provided on the outer peripheral surface of the disk 11 A plurality of blades 13 are elastically supported on the inner circumferential surface of the grouting hole 40 while being constricted by the inner circumferential surface of the grouting hole 40 to be supported without descending downward of the grouting hole 40. It is installed so that the small strand holder 20 is placed on the support member 10 installed in this way, but even if the strand 41 is installed to pass through the wedge unit hole 22, it is supported not to descend below the grouting hole 40.

The support member 10 is illustrated and described as having the stranded wire hole 12 perforated as in one embodiment, but as shown in FIG. 4, the washer-type in which the disk 11 is formed with a stranded wire hole as one large hole. It may be provided as, and may be provided by protruding a plurality of wings 13 bent obliquely upward on the outer circumferential surface of the disk 11.

The small strand holder 20 is provided with a disc member 21 having a diameter inserted into the inlet portion of the grouting hole 40, and the strand 41 penetrates through the disc member 21 and grips the strand 41 A number of wedge unit holes 22 for mounting the wedge unit 42 are perforated, and a first male screw 23 that is a fastening structure for fastening with the re-tensioning device 50 on the outer peripheral surface of the disk member 21 Is prepared.

The stranded wire 41 is buried in the grouting hole 40 in the ground, but one end is extended to protrude to the ground, and the end of the stranded wire 41 is supported by a small strand holder 20 by a pressure plate 43 Each wedge unit 43 is held as possible. The wedge unit 42 is seated in the wedge unit hole 22 of the small strand holder 20 to maintain the stranded strand 41 in a tensioned state.

The support member 30 is a plate material interposed between the small strand holder 20 and the acupressure plate 43 to support the small strand holder 20, and between the small strand holder 20 and the acupressure plate 43 A plurality of notch grooves 31 are formed in parallel so as not to be disturbed by the strands 41 passing through the small strand holders 20 when interposed therebetween.

5 and 6 are views illustrating a re-tensioning device for re-tensioning a strand with a strand re-tension anchor head unit according to the present invention.

As shown in the drawing, the re-tensioning device 50 includes a tensile bar 51 fastened to the small strand holder 20, and a casing installed so that the tensile bar 51 passes through the outer side of the small strand holder 20. (55), and a tension cylinder 57, which is one of the tensioning means installed on the casing 55, so as to pull the tension bar 51 drawn through the casing 55.

The tension bar 51 is provided with a connection socket 52 at one end and a second male screw 53 for fastening the pull nut 58 while penetrating the tension cylinder 57 at the other end. . The connection socket 52 is formed in a cap-shaped cross section having a female thread 52a so as to be fastened to the first male thread 23 of the small strand holder 20, and a spring 54a inside the connection socket 52 A wedge fixing plate 54 that elastically presses the wedge unit 42 may be provided.

The casing 55 is provided with a cap-shaped body 55a so as to be covered on the outside of the small stranded wire holder 20 and guided in the direction of the center line of the small stranded wire holder 20, and a tension bar at the top of the body 55a ( A first through hole 55b is formed with a diameter through which 51) passes without difficulty, and one or two cutout grooves 55c into which the support member 30 can be inserted are formed on the side of the body 55a.

The tension cylinder 57 is a hydraulic cylinder including a piston rod 57b with a piston in the cylindrical cylinder 57a, and fluid is introduced or introduced from the outside through the upper and lower ports of the cylindrical cylinder 57a. As the fluid is discharged, the piston rod 57b is raised and lowered together with the piston, and a second through hole 57c is formed in the center of the piston rod 57b to allow the tension bar 51 to pass therethrough.

A method of re-tensioning a steel wire using the re-tensioning anchor head unit and a re-tensioning device of the wire according to the present invention configured as described above is grouting in the ground anchor installed in the grouting hole 40 in the ground, as shown in FIG. The wire 41 and the wedge unit 42 in the steel wire holder installed at the entrance of the hole 40 were corroded or damaged, so that the wedge unit 42 gripped by the wire 41 was released, and at the same time, the wire ( 41) can be applied when the end of the stranded wire 41 is contracted and positioned at the entrance of the grouting hole 40.

As described above, when the strand 41 and the wedge unit 42 are released from the strand holder, a method of re-tensioning the strand will be sequentially described.

1) Support member installation step

First, as shown in FIG. 8, the support member 10 is inserted and installed by a predetermined depth from the entrance of the grouting hole 40 into the inside thereof. The installation of the support member 10 is performed by pushing into the grouting hole 40 by a predetermined depth so that the strands 41 in the grouting hole 40 pass through the respective strand holes 12 perforated in the disc 11 The blades 13 of 11) are inserted while being retracted, and the strands 41 in the grouting hole 40 are aligned without twisting by the strand holes 12 of the disk 11. At this time, the support member 10 is in a state in which the blades 13 are in close contact elastically with the inner surface of the grouting hole 40 by the elasticity of the blades 13 to be returned to their original shape from the outer peripheral surface of the disk 11.

2) Small strand holder installation step

Each of the strands 41 is inserted through the inlet of the grouting hole 40 while passing through each wedge unit hole 22 formed in the small strand holder 20, and the small strand holder 20 is placed on the support member 10. After laying, a wedge unit 42 is installed to hold the stranded strand 41 for each wedge unit hole 22 formed in the small stranded strand holder 20 (see FIG. 9).

At this time, the support member 10 and the small strand holder 20 are supported by the support member 10 because the blades 13 of the disc 11 forming the support member 10 are elastically supported on the inner surface of the grouting hole 40 Even if the small strand holder 20 is placed on top, it does not go down the grouting hole 40.

3) Re-tensioning device installation step

After placing the wedge fixing plate 54 including the spring 54a on the wedge unit 42 of the small stranded wire holder 20, the connection socket 52 to the first male screw 23 of the small stranded wire holder 20 Connect the connection socket 52 of the tension bar 51 so that the female thread 52a of) is fastened. In this way, when the connection socket 52 is fastened to the small strand holder 20, the wedge fixing plate 54 presses the wedge unit 42 installed in each wedge unit hole 22 by the elastic force of the spring 54a. The wedge unit 42 is prevented from being separated from the wedge unit hole 22 of the small strand holder 20.

While accommodating the connection socket 52 of the tension bar 51 as well as the small strand holder 20 on the pressure plate 43 at the entrance of the grouting hole 40, the tension bar 51 is the first through hole 55b Install the casing 55 to penetrate through.

The tension cylinder 57 so that the tension bar 51 drawn out through the first through hole 55b of the casing 55 passes through the second through hole 57c provided in the piston rod 57b of the cylindrical cylinder 57a. After installing, the pull nut 58 is fastened to the second male screw 53 of the tension bar 51 that is drawn out through the second through hole 57c of the piston rod 57b (see FIG. 10).

4) Re-tensioning the strands

When the fluid is introduced and discharged into the upper and lower ports of the tension cylinder 57 so that the piston rod 57b protrudes upward with the piston, the small stranded wire holder 20 together with the tension bar 51 is pulled. The strands 41 gripped by the wedge unit 42 in the wedge unit hole 22 of the small strand holder 20 start to be stretched, and the strands 41 start to be stretched, and the small strand holder 20 is grouted. It is pulled out to some extent from the entrance of the hole 40 (see Fig. 11). As described above, when a predetermined tensile force is applied to the stranded wire 41 while the small stranded wire holder 20 is sufficiently drawn out, the pressure plate 43 and the small stranded wire holder 20 through the cutout groove 55c of the casing 55 Re-tension the stranded wire by interposing one or two support members 30 in the space of (see Fig. 12).

5) Re-tensioning device removal step

When the re-tensioning of the stranded wire is completed as above, the fluid is reversely introduced and discharged into the upper and lower ports of the tension cylinder 57, so that the piston rod 57b with the piston is lowered so that the piston is depressed downward, and then the tension cylinder 57 The pull nut 58 fastened to the piston rod 57b of is loosened and removed, and the tension cylinder 57, the casing 55, and the tension bar 51 are sequentially separated and removed to complete the re-tensioning operation of the stranded wire ( 13).

14 to 16 are views showing another embodiment of a support member in the re-tensioning anchor head unit of a stranded wire according to the present invention. Here, the supporting member 10 aligns the strands 41 to facilitate the installation of the small strand holders 20, as many as the number of strands of strands-the strands guide 15 with holes 16 perforated, and the strands guides It is provided with an elastic band 17 that can be supported while preventing the strand guide 15 from falling down along the grouting hole 40 on the outer peripheral surface of (15).

The strand guide-hole 16 of the strand guide 15 is preferably formed in a vertebral shape having a wide lower portion and narrowing toward the upper portion to facilitate insertion and guidance of the strand 41.

The elastic band 17 is provided as a seed-shaped ring in which one side is cut off, and is provided in an arc-shaped cross-sectional shape that is convex from the top and bottom to the center.

According to the present invention of another embodiment configured as described above, since the strand guide-hole 16 of the strand guide 15 is formed in a vertebral shape, the grouting hole 40 is covered by the support member 10 and is not visible to the operator's eyes. Induces the ends of the strands 41 located at the entrance of the wires to be easily inserted, and thereby, the support member 10 is easily installed in the grouting hole 40, as well as the alignment of the strands 41 can be easily performed. It can be.

As described above, with reference to specific embodiments of the present invention, the present invention is not limited by the embodiments disclosed in the description of the present invention and the accompanying drawings, and variously by those skilled in the art within the scope of the technical spirit of the present invention. It can be transformed.

10: support member 11: disk
12: strand hole 13: wing
15: strand guide 16: strand guide-hole
17: elastic band 20: small stranded wire holder
21: disk member 22: wedge unit hole
23: first male screw 30: support member
40: grouting hole 41: strand
42: wedge unit 43: acupressure plate
50: re-tensioning device 51: tension bar
52: connection socket 54: wedge fixing plate
55: casing 57: tension cylinder
58: pull nut

Claims (5)

In the ground anchor comprising a wedge unit and a strand holder fastened to the end of the strand at the entrance of the grouting hole so that the strand is maintained in a state in which a tensile force is applied to the strand,
The strand holder is provided with a disc member having a diameter inserted into the entrance of the grouting hole, the strand is penetrated through the disc member, and several wedge unit holes for mounting the wedge unit to grip the strand are perforated and re-tensioned on the outer peripheral surface. Small stranded wire holder with a fastening structure for fastening with the device,
And a support member installed in the grouting hole under the steel wire holder to support the steel wire holder while preventing it from being lowered downward from a predetermined position at the entrance portion of the grouting hole,
The support member is composed of a disk having a hole through which the strands pass, and a plurality of blades inclined and protruding upward so as to be elastically supported with the inner peripheral surface of the grouting hole on the outer peripheral surface of the disk. Anchor head unit. delete delete In the ground anchor comprising a wedge unit and a strand holder fastened to the end of the strand at the entrance of the grouting hole so that the strand is maintained in a state in which a tensile force is applied to the strand,
The strand holder is provided with a disc member having a diameter inserted into the entrance of the grouting hole, the strand is penetrated through the disc member, and several wedge unit holes for mounting the wedge unit to grip the strand are perforated and re-tensioned on the outer peripheral surface. Small stranded wire holder with a fastening structure for fastening with the device,
And a support member installed in the grouting hole under the steel wire holder to support the steel wire holder while preventing it from being lowered downward from a predetermined position at the entrance portion of the grouting hole,
The support member includes a strand guide-hole perforated as many as the number of strands to facilitate the installation of the strand holder by aligning the strands, and a strand guide on the outer peripheral surface of the strand guide while preventing it from descending along the grouting hole. An anchor head unit for re-tensioning a stranded wire, characterized in that an elastic band is provided. When the wire and wedge unit in the wire holder is corroded or damaged at the entrance of the grouting hole of the installed ground anchor, and the wedge unit held by the wire is released and the end of the wire is located at the entrance of the grouting hole,
A support member installation step of inserting and installing a support member into the inner entrance portion of the grouting hole so as to align the stranded wires in the grouting hole and support the small stranded wire holder;
A small strand holder installation step of placing a small strand holder on the support member, installing a wedge unit so that the strands pass through each of the wedge unit holes and hold the strand for each wedge unit hole;
A connection socket, which is one end of the tension bar, is connected to the small strand holder, and a casing is installed on the acupressure plate to accommodate the strand holder even if the small strand holder falls outside the entrance of the grouting hole, and then passes through the casing and is drawn out. A re-tensioning device installation step of installing a tension cylinder, which is one of the tensioning means, on the casing so that the tensioned bar can be pulled;
When the small strand holder is pulled out from the entrance of the grouting hole by operating the tension cylinder and pulling the tensile straight along with the small strand holder, the strand is re-stretched by interposing a supporting member into the space between the acupressure plate and the small strand holder. A method of re-tensioning a steel wire using an anchor head unit for wire re-tensioning, including a wire re-tensioning step.

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