KR20160109863A - Anchoring Apparatus for Re-prestressing of Strand - Google Patents

Anchoring Apparatus for Re-prestressing of Strand Download PDF

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Publication number
KR20160109863A
KR20160109863A KR1020150035034A KR20150035034A KR20160109863A KR 20160109863 A KR20160109863 A KR 20160109863A KR 1020150035034 A KR1020150035034 A KR 1020150035034A KR 20150035034 A KR20150035034 A KR 20150035034A KR 20160109863 A KR20160109863 A KR 20160109863A
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KR
South Korea
Prior art keywords
hole
strand
tension
block
wedge
Prior art date
Application number
KR1020150035034A
Other languages
Korean (ko)
Inventor
주봉철
신현섭
김태헌
김병철
박기태
Original Assignee
한국건설기술연구원
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Priority to KR1020150035034A priority Critical patent/KR20160109863A/en
Publication of KR20160109863A publication Critical patent/KR20160109863A/en

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The present invention relates to an anchoring device for a prestressed material of re-prestressable configuration using a re-prestressing block forming an external threaded part for each strand which can anchor a plurality of strands simultaneously, and by anchoring using a wedge coupling block (re-prestressed block), which is possible to be re-prestressed and forms a thread on an outer part for each of strands, and when needed, configured to introduce an additional pre-stress by re-stressing a strand in a predetermined range.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for re-prestressing a strand,

The present invention relates to a tension material fixing apparatus for fixing a prestressed prestressed strand (strand) to an end of a structural member by tension, and more particularly, it is possible to fix a plurality of strands at the same time, (Hereinafter referred to as " re-tension block ") with threaded threads formed on the strand by a strand, which may be further tensioned within a predetermined range to introduce additional prestress The present invention relates to an apparatus for fixing a tension member in a retractable configuration using a re-tension block having an external thread portion.

In order to introduce a prestress into a structural member such as a girder, a fixing device is installed at the end of the structural member, and the tensioned strand is fixed to the fixing device. Fig. 13 is a schematic exploded perspective view showing a state in which a strand is fixed to a conventional fixing device. Fig. 14 shows an example of a structural member 200, which is a conventional fixing device shown in Fig. 13, A perspective view showing a state in which a strand is fixed by using a laser beam is shown.

A conventional fixing apparatus for fixing a strained strand has a plurality of wedge holes 11 in the form of a cone and having a thickness and through which the strands 5 are passed, as shown in Figs. 13 and 14 And a wedge 12 that fits into the wedge hole 11 while covering the strand 5 that has passed through the wedge hole 11. [ Such a conventional fixing device is disclosed in Korean Utility Model Publication No. 20-1998-015795.

After the strands 5 have been fixed, it may be necessary to further increase the amount of prestress introduced into the structural member 200 by further retightening the strands 5, as the case may be. Such a conventional fixing apparatus is characterized in that the strand 5 is inserted into the wedge hole 11 and is inserted into the wedge hole 11 and then an unnecessary portion of the strand 5 is cut as shown in Fig. It is virtually impossible to re-tension the strand 5 when the portion of the strand 5 is very small.

Korean Utility Model Application Publication No. 20-1998-015795 (published on June 25, 1998).

The present invention has been developed in order to overcome the limitations of the prior art as described above and it is an object of the present invention to provide a torsionally retentive structure capable of easily restoring a strand to be introduced into a structural member even after tensioning and fixing the strand, And an object thereof is to provide a fixing device.

In order to achieve the above object, according to the present invention, there is provided a fixing device comprising: a fixing plate having a through hole through which a strand penetrates and through which a re-tensioning block is screwed; A re-tensioning block having a central hole through which the strand penetrates, the re-tensioning block having a tapered wedge hole formed in the frontal direction at a center hole thereof, the re-tensioning block being screwed to the coupling through hole so as to adjust the insertion depth of the coupling through- A wedge that wraps around the strand and fits in the wedge hole; The fixing plate is brought into close contact with the structural member and the end of the strand penetrating through the center hole of the re-tensioning block is fixed to the wedge hole by the wedge so that the pre-stress is introduced into the structural member, And an additional prestress due to the additional strain of the strand is introduced into the structural member.

In the tension member fixing apparatus of the present invention, the coupling through holes may be formed on the fusing plate in plural, and for easy rotation of the re-tensioning block, the rod-like grip of the rotating tool is inserted into the end surface of the re- A rotary tool insertion hole may be formed or a head portion having a polygonal frontal shape may be formed at the front end portion of the re-tension block.

In particular, when the head portion is formed, the re-tensioning block is formed by a plate member so as to extend further in the front direction from the engaging through-hole by rotation to maintain additional stress introduced into the structural member, And a supporting washer member sandwiched between the fixing member and the front surface of the fixing plate. In this case, the supporting washer member may be divided into a plurality of divided members.

According to the present invention, when the re-tensioning block of the tension device fixing device is rotated, the strand is re-tensioned so that an additional tension force (prestress) can be introduced into the structural member. Thus, It is possible to introduce an additional prestress due to re-tension.

That is, in the present invention, after the strand is sandwiched by the wedge and inserted into the wedge hole, the unnecessary portion of the strand is cut, so that even when the portion of the strand protruding outward is very small, the strand can be easily re- The effect is demonstrated.

1 is a schematic exploded perspective view of a tension member fixing apparatus according to a first embodiment of the present invention.
FIG. 2 is a schematic perspective view showing a state in which the tension member fixing device of FIG. 1 is installed at an end portion of a girder as a structural member.
FIG. 3 is a schematic perspective view of a re-tension block provided in the tension member fixing apparatus of FIG. 1. FIG.
4 is a schematic cross-sectional view according to circle AA in FIG.
5 is a schematic perspective view showing a state of rotating the re-tension block.
6 is a schematic partial cross-sectional view along line BB of Fig. 5 showing a state in which a strand is fixed by a re-tensioning block.
7 is a schematic partial cross-sectional view showing the state after re-tensioning the strand following the state shown in Fig.
8 is a schematic exploded perspective view of a tension member fixing apparatus according to a second embodiment of the present invention.
FIG. 9 is a schematic perspective view showing a state in which the tension member fixing apparatus of FIG. 8 is installed at an end portion of a girder which is a structural member.
10 is a schematic perspective view of a re-tension block provided in the tension member fixing apparatus of FIG.
11 is a schematic partial cross-sectional view along line CC of Fig. 9 showing a state in which strands are fixed by the re-tensioning block of Fig.
12 is a schematic partial cross-sectional view showing the state after re-tensioning the strand following the state shown in Fig.
13 is a schematic exploded perspective view showing a state in which a strand is fixed to a conventional fixing device.
14 is a schematic perspective view showing a state in which a strand is fixed using the conventional fixing apparatus shown in Fig. 13 at an end portion of a concrete girder as an example of a structural member.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby.

FIG. 1 is a schematic exploded perspective view of a tension member fixing apparatus 100 according to a first embodiment of the present invention. FIG. 2 is a perspective view of the tension member fixing apparatus 100 shown in FIG. 1, And FIG. 6 is a perspective view showing a state in which the endoscope is installed at an end portion of the endoscope. FIG. 3 is a schematic perspective view of a re-tension block 10 provided in the tension member fixing apparatus 100 shown in FIG. 1, and FIG. 4 is a schematic cross-sectional view taken along the line A-A of FIG. In the drawings, a tenter fixing device 100 of the present invention is shown as a concrete girder. The concrete girder is merely an example of a structural member 200 on which the tensional fixing device 100 of the present invention is installed. The structural member 200 on which the apparatus 100 is installed is not limited to a concrete girder, and may correspond to various structures.

As shown in the drawing, the tension member fixing device 100 of the present invention is a fixing device having a thickness and having a through hole 103 through which a strand 5 is passed and a re-tension block 10 is threaded, A re-tension block 10 having a threaded portion formed on an outer surface thereof and screwed into the coupling hole 103 so as to adjust the insertion depth thereof and having a tapered wedge hole 11 in the frontal direction; And a wedge (12) wrapped around the strands (5) and fitted in the wedge holes (11).

The fixing plate 1 is composed of a plate member having a thickness and a plurality of coupling through holes 103 through which the strands 5 pass are formed. Each coupling through hole 103 has a threaded portion formed on the inner surface thereof It consists of holes. The surface on which the fixing plate 1 is brought into close contact with the structural member 200 for convenience is referred to as "back surface ", and the surface in the opposite direction is referred to as" front surface ".

The re-tension block (10) is a member to which the wedge (12) is fitted and fastened, and has a configuration capable of re-tensioning the strands (5). Specifically, the re-tension block 910 in the present invention is formed of a cylindrical member. The outer surface of the re-tension block 910 is threaded and inserted into the through hole 103 of the fixing plate 1 by screwing. Therefore, the depth of insertion of the re-tension block 10 into the coupling hole 103 is increased or decreased by the relative rotation between the re-tension block 10 and the fixing plate 1. For example, when the re-tension block 10 is rotated in one direction, the re-tension block 10 gradually escapes from the through hole 103 and the projected height of the re-tension block 10 in the front direction of the fusing plate 1 Can be increased.

A hole through which the strands 5 pass is formed at the center of the re-tension block 10. The center hole formed in the re-tension block 10 has a size of the center hole extending from the end in the front direction to the back direction A wedge hole 11 having a gradually tapered shape is formed. The center hole of the re-tension block 10 may be formed as the wedge hole 11 having the above-described tapered shape over the entire length. However, as illustrated in the figure, only the portion corresponding to a certain length from the front surface is tapered And may be a simple circular hole having a constant diameter up to an end portion in the back surface direction continuous to the wedge hole 11 and composed of a wedge hole 11. [ A strand (5) is inserted through a center hole formed in the re-tension block (10).

As described above, the re-tension block 10 is rotated to change the depth of insertion of the fastening block 10 into the fastening hole 103. In order to easily rotate the re-tensioning block 10, In the case of the embodiment, the rotary tool insertion hole 102 is formed in the end surface of the re-tension block 10 in the front direction. The rotary tool insertion hole 102 is formed by a hole having a predetermined depth from the front surface of the re-tension block 10, and a plurality of the rotary tool insertion holes 102 are present at an interval.

5 shows a schematic perspective view showing a state in which the re-tension block 10 is rotated. As shown in FIG. 5, a rotary tool (not shown) having a bar- The user can rotate the rotary tool 30 while the rod gripper 31 is inserted into the rotary tool insertion hole 102. When the user rotates the rotary tool 30, 10 is rotated.

The wedge 12 is a member that is fitted in the wedge hole 11 by wrapping the outer surface of the strand 5 passing through the center hole of the re-tension block 10.

Figure 6 shows a schematic partial cross-sectional view along line BB of Figure 3 showing the state that the strands 5 are fixed by the re-tensioning block 10, and Figure 7 shows a cross- There is shown a schematic partial cross-sectional view showing a state in which the strands 5 have been re-tensioned.

As shown in the drawing, the tension member fixing apparatus 100 of the present invention is used for various structural members 200 in which strands 5 are disposed. The back surface of the fixing plate 1 is fixed to one surface of the structural member 200 And the strand 5 protrudes in the front direction through the center hole of the re-tension block 10 and the wedge 12 wraps around the outer surface of the strand 5 in a state where the strand 5 is tensed, And is fixed to the wedge hole 11.

When the reinforcement of the strand 5 is required during the common use of the structural member 200 or when other necessary conditions occur and the reinforcement block 10 is rotated in one direction as described above, The strand 5 is further tensed in the front direction by causing the block 10 to gradually escape from the engagement through hole 103 to increase the projected height of the retension block 10 in the front direction of the fusing plate 1 So that additional tensional forces are introduced into the structural member 200.

As described above, the tension member fixing apparatus 100 according to the present invention can easily retension the strands 5 only by rotation of the re-tension block 10 to introduce additional tension force (prestress) into the structural member 200 .

8 is a schematic exploded perspective view of a tension member fixing apparatus 100 according to a second embodiment of the present invention. FIG. 9 is a perspective view of the tension member fixing apparatus 100 of FIG. And FIG. 10 is a schematic perspective view of the re-tension block 10 provided in the tension-type fixing apparatus 100 of FIG. 8. As shown in FIG. Fig. 11 shows a schematic partial cross-sectional view along a line CC of Fig. 9 showing a state in which the strands 5 are fixed by the re-tension block 10 shown in Fig. 10. Fig. Lt; RTI ID = 0.0 > a < / RTI > state after re-tensioning the strand.

The tension member fixing apparatus 100 according to the second embodiment of the present invention shown in FIGS. 8 to 12 includes the tension member fixing apparatus 100 according to the first embodiment shown in FIGS. 1 to 7, There is a difference in the configuration of the front end direction of the base 10. That is, in the case of the re-tension block 10 provided in the tensional fixing device 100 according to the second embodiment of the present invention shown in Figs. 8 to 12, the head portion having a polygonal front- 1 to 7 in that the supporting washer member 17 can be further provided on the outer surface of the re-tension block 10, if necessary, Which is different from the device 100.

Specifically, the head portion 19 is a member extended to have a larger cross-section than the cylindrical body of the re-tension block 10 in which the thread portion is formed, and has a hexagonal or other polygonal shape as the head of the bolt. In the re-tensioning block 10 provided in the tensional fixing device 100 according to the second embodiment of the present invention shown in Figs. 8 to 12, other constructions such as the center hole and the wedge hole 11 are the same as those of the first Are provided in the same manner as in the embodiment.

When the re-tension block 10 is provided with the head portion 19, when the re-tension of the strand 5 is required, the head portion 19 is bored by using a known engaging tool or the like used for fastening the bolt By rotating easily, the strands 5 are further tensed in the front direction to introduce additional prestress into the structural member 200.

When the re-tension block 10 requires re-tensioning of the strand 5, the re-tension block 10 is rotated in one direction as described above so that the re-tension block 10 moves from the coupling hole 103 in the front direction The supporting washer member 17 made of a plate member as shown in Fig. 12 may be re-tensioned, if necessary, in order to keep the structure member 200 from being further stressed, So that it can be further sandwiched between the head 19 and the front face of the fixing plate 1 so as to surround the outer surface of the block 10. [ When the supporting washer member 17 is interposed between the head 19 and the front surface of the fixing plate 1, the inner surface of the coupling hole 103 of the fixing plate 1 and the inner surface of the fixing block 1, The re-tension block 10 is not pulled by the tightening force into the coupling through hole 103, so that the tension of the strand 5 is maintained, and therefore, even if a slip occurs in the thread engagement between the outer surfaces of the prestress There is an advantage that it is applied to the structural member 200.

The supporting washer member 17 may be configured in a plurality of divided forms as illustrated in the figure. In this case, in the interval between the head portion 19 and the front face of the fixing plate 1, It is very convenient to enclose the re-tension block 10.

1: Fixed plate
5: Strand
10: Re-tensioning block
11: Wedge hole
12: Wedge

Claims (6)

A fixing plate (1) having a through hole (103) through which a strand (5) penetrates and a re - tension block (10) is threaded through;
A central hole through which the strands 5 are threaded and which is threaded to the coupling through hole 103 so as to adjust the depth of insertion into the coupling through hole 103 by rotation, A retension block (10) having a hole (11) formed therein;
And a wedge (12) wrapped around the strand (5) and fitted in the wedge hole (11);
The fixing plate 1 is brought into tight contact with the structural member 200 and the end of the strand 5 passing through the center hole of the re-tension block 10 is fixed to the wedge hole 11 by being pushed by the wedge 12, The re-tension block 10 is rotated so as to come out of the coupling through hole 103 in the state where the prestress is introduced into the structural member 200 so that an additional prestress due to the additional strain of the strand 5 is introduced into the structural member 200 Wherein the tension member is a tension member.
The method according to claim 1,
Wherein a plurality of coupling through holes (103) are formed on the fixing plate (1).
3. The method according to claim 1 or 2,
Characterized in that a rotary tool insertion hole (102) for inserting a bar tongue (31) of a rotary tool (30) is formed on a front end surface of the re - tension block (10) .
3. The method according to claim 1 or 2,
Characterized in that a head portion (19) having a polygonal front face is formed at the front end of the re-tension block (10).
5. The method of claim 4,
The resilient block 10 is constructed of a plate member so that the resilient block 10 further rotates out of the engagement through hole 103 in the frontal direction so that additional stress is introduced into the structural member 200, Further comprising a washer member (17) for supporting the outer surface of the fixing plate (1) and sandwiched between the head (19) and the front surface of the fixing plate (1).
6. The method of claim 5,
Characterized in that the supporting washer member (17) is divided into a plurality of divided members.
KR1020150035034A 2015-03-13 2015-03-13 Anchoring Apparatus for Re-prestressing of Strand KR20160109863A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109594721A (en) * 2018-12-04 2019-04-09 东南大学 A kind of prestressed FRP rebar pre-tensioning system stretch-draw anchor equipment
CN109693309A (en) * 2019-03-01 2019-04-30 天津银龙预应力材料股份有限公司 A kind of novel pre-stressed rail plate tension device
KR101989164B1 (en) * 2018-07-23 2019-06-17 한국건설기술연구원 Pre-stressing anchorage apparatus for strengthening sheer capacity of retaining wall, and method using the same
KR102098014B1 (en) 2019-12-19 2020-04-07 한국건설기술연구원 Ahchoring device using shape memory alloy and constructiion method therefor
KR102454482B1 (en) * 2021-09-27 2022-10-12 김윤기 External tendon restressing type girder

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980015795A (en) 1996-08-23 1998-05-25 배순훈 In the MPEG-2 encoder, a differential pulse code modulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980015795A (en) 1996-08-23 1998-05-25 배순훈 In the MPEG-2 encoder, a differential pulse code modulator

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101989164B1 (en) * 2018-07-23 2019-06-17 한국건설기술연구원 Pre-stressing anchorage apparatus for strengthening sheer capacity of retaining wall, and method using the same
CN109594721A (en) * 2018-12-04 2019-04-09 东南大学 A kind of prestressed FRP rebar pre-tensioning system stretch-draw anchor equipment
CN109693309A (en) * 2019-03-01 2019-04-30 天津银龙预应力材料股份有限公司 A kind of novel pre-stressed rail plate tension device
CN109693309B (en) * 2019-03-01 2024-02-13 天津银龙预应力材料股份有限公司 Novel prestressing force track board stretch-draw device
KR102098014B1 (en) 2019-12-19 2020-04-07 한국건설기술연구원 Ahchoring device using shape memory alloy and constructiion method therefor
KR102454482B1 (en) * 2021-09-27 2022-10-12 김윤기 External tendon restressing type girder

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