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EP0190989B1 - Zwischenankeranordnung zum Vorspannen von Bauteilen, die in mehreren Bauetappen erstellt werden, und ein Verfahren zum Herstellen einer solchen Zwischenankeranordnung - Google Patents

Zwischenankeranordnung zum Vorspannen von Bauteilen, die in mehreren Bauetappen erstellt werden, und ein Verfahren zum Herstellen einer solchen Zwischenankeranordnung Download PDF

Info

Publication number
EP0190989B1
EP0190989B1 EP86810009A EP86810009A EP0190989B1 EP 0190989 B1 EP0190989 B1 EP 0190989B1 EP 86810009 A EP86810009 A EP 86810009A EP 86810009 A EP86810009 A EP 86810009A EP 0190989 B1 EP0190989 B1 EP 0190989B1
Authority
EP
European Patent Office
Prior art keywords
prestressing
anchor
clamping
clamping wedges
anchors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86810009A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0190989A1 (de
Inventor
Niklaus Gabriel Moser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VSL International Ltd
Original Assignee
VSL International Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by VSL International Ltd filed Critical VSL International Ltd
Publication of EP0190989A1 publication Critical patent/EP0190989A1/de
Application granted granted Critical
Publication of EP0190989B1 publication Critical patent/EP0190989B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • E04C5/122—Anchoring devices the tensile members are anchored by wedge-action
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49874—Prestressing rod, filament or strand

Definitions

  • the invention relates to an intermediate anchor arrangement according to the preamble of patent claim 1 and to a method for producing an intermediate anchor arrangement according to the preamble of patent claim 5.
  • the "prestressing with subsequent bond” is known , in which the tendons are guided longitudinally in cladding tubes and tensioned after the concrete has hardened. The empty spaces remaining in the cladding tubes are then filled with grout the respective tendons achieve a bond between them and the concrete surrounding them, which provides additional security both when broken and when an anchor fails.
  • pre-stressing without bond has recently been increasingly used for concrete ceilings and other concrete components.
  • Pre-stressing without bond prevents the tendon from coming into direct contact with the concrete.
  • the tendon surrounded by a layer of permanent corrosion protection grease is located in a plastic tube. After the concrete has hardened, the tendons are prestressed without creating a bond with the surrounding concrete over the entire length between the two anchors.
  • DE-B-1 147740 describes an intermediate anchorage, which is referred to as a tendon joint, in which two adjacent tension anchors are firmly connected to one another by threaded bolts before the second construction stage is concreted.
  • the two tension anchors hold the adjacent ends together of two tendons arranged one behind the other, the threaded bolts being loaded with at least the prestressing force of the tendons.
  • an annular fitting is inserted between them and a rubber plate between the clamping wedges and the two tension members.
  • This known intermediate anchorage has the disadvantages that high-strength threaded screws must be used, which together have to withstand the tension of the tendons, tightening the nuts screwed onto the threaded bolts requires great skill and must be carried out very carefully, since at least four high-strength screws are tightened at the same time and, finally, the section between the tendons in the area of the butt joint is not pretensioned on the concrete by the rigid and inextensible tendon joint. This means that the construction section in the area of the butt joint is in danger of cracking in use and must be dimensioned according to other static criteria than that of the prestressing without bond.
  • US-A-4 368 607 describes an intermediate anchor which has two tension anchors with associated clamping wedges.
  • the clamping wedges of each tension anchor are assigned an actuating member with a tube piece surrounding the tension member and a hood surrounding the thicker ends of the clamping wedges and part of the tension anchor.
  • An external thread is present on the pipe sections and a tubular pressing member provided with opposing internal threads is screwed onto this external thread of the opposite pipe sections of the actuating members.
  • the central area of the pressing member is hexagonal so that the pressing member can be rotated about its longitudinal axis with the help of a wrench, whereby the actuating members are pressed apart and the clamping wedges are pressed into the frustoconical recess in the tensioning anchors.
  • This known intermediate anchor arrangement is foamed as a whole between the two anchor plates with polystyrene and thus forms a cuboid plastic recess block, the actuating element being in a position in which the clamping wedges only partially protrude into the aforementioned frustoconical recess and which enables the individual tendons to be subsequently threaded.
  • the plastic foam recess block is preferably arranged above the supports.
  • Normal known tension anchors are placed at both ends of the tendon and then the entire ceiling is concreted.
  • the foam surrounding the intermediate anchor arrangements is removed so that the pressing members are accessible.
  • the tendons are then tensioned over their entire length in a known manner.
  • the pressing member of each intermediate anchor arrangement is actuated in such a way that the clamping wedges are pressed into the frustoconical recess of the tensioning anchors and thus the relevant area of the tendon is firmly clamped in the tensioning anchor so that the tendon can no longer move in its longitudinal direction.
  • the recesses created by removing the plastic are filled with concrete.
  • the plastic has to be removed after the concrete has hardened and the resulting cavities in the concrete have to be filled up again after the compression members have been tightened, which is associated with considerable additional work.
  • the pressing member must be tightened with great care, because if the tightening is insufficient, the clamping effect is too small and the intermediate anchor arrangement is not effective.
  • Another disadvantage is that the recesses in the concrete are only filled with concrete mortar after the prestressing work has been completed, thereby forming places that are not prestressed.
  • the intermediate anchor arrangement according to the invention is characterized by the features stated in the characterizing part of patent claim 1.
  • the inventive method for producing an intermediate anchor arrangement is characterized by the features listed in the characterizing part of claim 5.
  • a component in particular a concrete ceiling 1 is very simplified and shown in section so that one of the tendons 2 extending through the concrete ceiling 1 is visible.
  • the ends of the concrete ceiling are supported on outer walls 3 which are only partially shown. Between the outer walls 3, pillars 4, metal supports or partitions are provided, on which the concrete ceiling 1 is additionally supported.
  • an end tension anchor 5 is provided at both ends of the tendon 2, which can be, for example, a tension cable made of steel wires.
  • an end tension anchor arrangements 6 are preferably arranged in the area above the pillars 4. The invention described below relates to the design and manufacture of such an intermediate anchor arrangement 6.
  • FIG. 2 shows a longitudinal section through an exemplary embodiment of such an intermediate anchor arrangement 6, which comprises two tension anchors 7 and 8, which can also be used individually as the above-mentioned end tension anchors 5 at the two ends of the tension member 2.
  • Each tension anchor has a support body 9 or 10 with a radially outwardly projecting flanges 11 or 12 and a support rib 13 or 14 also projecting outwards.
  • the support body 9 and 10 has a cylindrical projection 15 and 16 respectively.
  • a passage consisting of a cylindrical part 17 or 18 in the area of the shoulder 15 or 16 and a frustoconical part 19 or 20 extends through the support body 9 or 10, through which the tendon 2 extends.
  • the frustoconical part 19 is intended for receiving two clamping wedges 21, for example, and the frustoconical part 22 is intended for receiving two clamping wedges 22, for example.
  • the clamping wedges 21 and 22 are provided on their inside with sawtooth-shaped ribs 23 which, when the clamping wedges are brought into the operative position, at least partially penetrate into them to hold the tendon 2 in place.
  • tubular rigid element 25 for. B. a pipe section arranged.
  • the inner diameter of the tubular element 25 is larger than the outer diameter of the tendon 2 so that it can move freely within the tubular element 25.
  • Screws 26 e.g., distributed evenly over the circumferential area of the flanges 11 and 12. B. four, extend through holes in the flanges. The task which the screws 26 have to be performed is described in more detail below.
  • FIG. 3 shows only a part of the tendon 2 and the clamping wedges 21 'and 22' of the intermediate anchor arrangement.
  • the clamping wedges 21 'and 22' are rigidly connected to one another via a web 27, which web takes over the function of the above-mentioned tubular element 25.
  • FIG. 4 shows a section through the web 27
  • FIG. 5 shows a section through the clamping wedges 22 '.
  • the web 27 is designed such that it does not touch the tendon 2 in the assembled state.
  • the clamping wedges 21 are of the same design as the clamping wedges 21 which are shown in FIG. 2.
  • the clamping wedges 22" each have an extension 28, the free ends of which are intended to rest against the end face 24 of the clamping wedges 21.
  • the extensions 28 are designed such that they do not touch the tendon 2 in the assembled state of the clamping wedges. This embodiment is the most advantageous of the three above-mentioned embodiments of the means for holding the clamping wedges at a predetermined distance.
  • FIG. 7 shows a part of the intermediate anchor arrangement according to the invention after concreting the preceding construction phase.
  • the tendon 2 was pushed through the tension anchor 7 and the tension anchor 7 was fastened by means of screws 26 to a formwork board 29 which is only partially shown, the tension anchor 7 being replaced by a filler 30, e.g. B. of polystyrene, is kept at a distance from the formwork board 29.
  • the concrete filled in during the first construction phase is designated by 31.
  • the intermediate anchor arrangement described above is used to create components such as concrete ceilings, floor slabs, rugpists, bridge slabs, etc. with «pre-stressing without bond» the sections of the tendon 2 which extend through the concrete are of a protective cover, not shown, or one Surround protective tube. So that the concrete does not penetrate into the interior of the tension anchor 7, a sleeve 32 is provided which forms a protective transition between the end of the protective cover (not shown) and the cylindrical extension 15.
  • the formwork board 29 and the filler 30 are removed.
  • the latter leaves a niche 33 (see FIG. 2) into which the tension anchor 7 partially protrudes.
  • the clamping wedges 21 are inserted into the frustoconical part 19 of the passage of the tension anchor 7 and the section of the tendon 2 extending through the hardened concrete 31 is prestressed to the desired value by means of a known and therefore not described prestressing device. After the prestressing has been carried out, the clamping wedges 21 assume the position shown in the figure within the tension anchor 7 and prevent the section of the tension member 2 from being able to relax.
  • the tubular element 25 and then the tension anchor 18 are first pushed onto the tensioning element 2 without the clamping wedges 22 until the element 25 rests on the end face 24 of the clamping wedges 21.
  • the clamping wedges 22 are inserted into the frustoconical part 20 of the passage in the tension anchor 8 and this is pushed in the direction of the already embedded concrete anchor 7 until the end face 24 of the clamping wedges 22 abut the tubular element 25 and the screws 26 pass through the flange 12 of the Extend tension anchor 8.
  • the tension anchor 8 is held coaxially to the tension anchor 7 by means of screw nuts 34 screwed onto the ends of the screws 26, which are only moderately tightened.
  • the screw nuts 34 are only tightened to such an extent that all the clamping wedges 21 and 22 lie snugly against the tubular element 35 and the clamping wedges 22 are not completely inserted into the frustoconical part 20 of the passage in the tensioning anchor 8 and thus only a very slight clamping effect on the tendon 2 exercise. This state is shown in FIG. 2.
  • the subsequent construction section is concreted.
  • the niche 33 is also filled with concrete.
  • the anti-corrosion tape 35 prevents concrete from entering the space between the clamping wedges 21 and 22.
  • the relevant section of the tendon 2 is prestressed to the desired value mentioned above.
  • an end tie rod 5 or the tie rod 7 of a subsequent intermediate anchor arrangement can be arranged. Because the clamping wedges 22 of the tension anchor 8 have practically no clamping action on the tendon 2, the prestressing of the second section of the tendon 2 affects the part of the tendon 2 clamped by the clamping parts 21, whereby the tendon 2 at least approximates its entire length is pre-stressed evenly, regardless of the number of intermediate anchor arrangements located between the end points of the tendon 2.
  • a major advantage of the intermediate anchor arrangement described above enables the prestressed tendon 2 over its entire length, i. H. is preloaded practically evenly in the area of the intermediate anchor arrangements.
  • clamping wedges 21 and 22 and the tubular element 25 instead of the clamping wedges 21 and 22 and the tubular element 25, the clamping wedges 21 'and 22' can be used, which are rigidly connected to one another via the web 27, or preferably can Wedges 21 and 22 "are used, the wedges 22" having the extension 28.
  • This latter embodiment of the spacer means is characterized by an assembly which is simpler than that of the tubular spacer.
  • the intermediate anchor arrangement described above is also effective in the event of a fault if, for example, when prestressing the subsequent construction phase, a greater pretension is applied to the tendon 2 than the above-mentioned setpoint.
  • the clamping wedges 21 of the tensioning anchor 7 can be moved a little to the right in relation to FIG. 2, as a result of which the clamping effect of the clamping wedges 21 is reduced.
  • the tubular element 25 transmits the displacement movement of the clamping wedges 21 to the clamping wedges 22 in such a way that the clamping effect of the wedges 22 increases to the extent that the clamping effect of the clamping wedges 21 decreases.
  • the tendon 2 is again subjected to tensile stress over its entire length.
  • the clamping wedges react in the same way as already described above, i. H. in the event of a fault, those clamping wedges that face the faulty area are always automatically brought into their full operative position.
  • the screws 26 serve on the one hand to hold the formwork board 29 during the concreting in of the tension anchor 7, to hold the tension anchor 8 during assembly and to fit the tubular element 25 or the extension 28 against the end face of the clamping wedges, they are not a major burden exposed and therefore normal screws can be used.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Piles And Underground Anchors (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
EP86810009A 1985-01-17 1986-01-13 Zwischenankeranordnung zum Vorspannen von Bauteilen, die in mehreren Bauetappen erstellt werden, und ein Verfahren zum Herstellen einer solchen Zwischenankeranordnung Expired EP0190989B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH216/85A CH665444A5 (de) 1985-01-17 1985-01-17 Zwischenankeranordnung zum vorspannen von bauteilen, die in mehreren bauetappen erstellt werden, und ein verfahren zum herstellen einer solchen zwischenankeranordnung.
CH216/85 1985-01-17

Publications (2)

Publication Number Publication Date
EP0190989A1 EP0190989A1 (de) 1986-08-13
EP0190989B1 true EP0190989B1 (de) 1989-11-23

Family

ID=4181918

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810009A Expired EP0190989B1 (de) 1985-01-17 1986-01-13 Zwischenankeranordnung zum Vorspannen von Bauteilen, die in mehreren Bauetappen erstellt werden, und ein Verfahren zum Herstellen einer solchen Zwischenankeranordnung

Country Status (20)

Country Link
US (1) US4724639A (zh)
EP (1) EP0190989B1 (zh)
JP (1) JPH0654052B2 (zh)
KR (1) KR950006576B1 (zh)
CN (1) CN1006728B (zh)
AT (1) AT390101B (zh)
AU (1) AU582204B2 (zh)
CA (1) CA1274702A (zh)
CH (1) CH665444A5 (zh)
DE (1) DE3667085D1 (zh)
DK (1) DK161159C (zh)
FI (1) FI78760C (zh)
GR (1) GR860107B (zh)
IN (1) IN164583B (zh)
MY (1) MY101866A (zh)
NO (1) NO163750C (zh)
PT (1) PT81852B (zh)
SG (1) SG54191G (zh)
TR (1) TR22659A (zh)
ZA (1) ZA8644B (zh)

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CH665444A5 (de) * 1985-01-17 1988-05-13 Losinger Ag Zwischenankeranordnung zum vorspannen von bauteilen, die in mehreren bauetappen erstellt werden, und ein verfahren zum herstellen einer solchen zwischenankeranordnung.
FR2639054B2 (fr) * 1988-02-03 1992-07-03 Techniport Sa Perfectionnements apportes a la liaison mecanique de ronds a beton, procede de realisation de telles liaisons et rond a beton obtenu par la mise en oeuvre dudit procede
JPH01207553A (ja) * 1988-02-16 1989-08-21 Sumitomo Electric Ind Ltd アンボンドｐｃ鋼より線の定着具
DE3819023A1 (de) * 1988-06-03 1989-12-07 Werner Zapf Bewehrungsanordnung fuer baukonstruktionen aus spannbeton
JPH089296Y2 (ja) * 1988-10-04 1996-03-21 川鉄テクノワイヤ株式会社 Ｐｃ鋼材定着用雌コーン
JPH0629320Y2 (ja) * 1988-10-04 1994-08-10 フドウ建研株式会社 Ｐｃ鋼材定着用雌コーン
US5308184A (en) * 1989-01-27 1994-05-03 Techniport S.A. Method and apparatus for mechanically joining concrete-reinforcing rods
US5230589A (en) * 1992-03-23 1993-07-27 Gillespie Harvey D Mine roof bolt
FR2691737A1 (fr) * 1992-05-26 1993-12-03 Freyssinet Int & Co Perfectionnements aux dispositifs pour effectuer des ancrages intermédiaires sur des câbles de précontrainte.
US5366672A (en) * 1993-03-18 1994-11-22 Erico International Corporation Method of forming concrete structures with a grout splice sleeve which has a threaded connection to a reinforcing bar
US6234709B1 (en) * 1998-01-15 2001-05-22 Felix L. Sorkin Wedge-receiving cavity with radiused edge for an anchor body of a post-tension anchor system
US6176051B1 (en) * 1999-04-26 2001-01-23 Felix L. Sorkin Splice chuck for use in a post-tension anchor system
US6481102B1 (en) * 1999-12-02 2002-11-19 Tommie D. Hill Attachment devices, systems, and methods for a tendon, rod, or other elongated member
KR20000063198A (ko) * 2000-05-09 2000-11-06 최부진 쌍눈 입체촬영기
US6881015B2 (en) 2002-10-16 2005-04-19 Dywidag-Systems International, U.S.A., Inc. Wedge barrel for a mine roof cable bolt
FR2858345B1 (fr) * 2003-07-28 2007-04-20 Freyssinet Int Stup Procede de renforcement d'un ouvrage d'art et piece d'ancrage associee
US20050097843A1 (en) * 2003-11-07 2005-05-12 Giesel Ronald D. Releasable coupling device for use with reinforcing tendons and method of using the same
US7384216B2 (en) * 2004-09-16 2008-06-10 Dywidag-Systems International Usa Cable coupler having retained wedges
US7690868B2 (en) * 2003-12-02 2010-04-06 Dsi Ground Support Inc. Cable coupler having retained wedges
US7066688B2 (en) * 2004-08-17 2006-06-27 Dywidag-Systems International Usa Wedge barrel for a twin cable mine roof bolt
US20060201083A1 (en) * 2005-03-11 2006-09-14 Hayes Speciality Machining, Ltd Tensioning anchor suitable for blind-hole tendon anchoring and tendon repair
US7841061B1 (en) * 2007-09-27 2010-11-30 Sorkin Felix L Method of forming a dead-end anchorage of a post-tension system
KR100934608B1 (ko) 2009-06-24 2009-12-31 김형중 단부 고정형 강선 정착장치 그리고 이를 이용한 프리캐스트 콘크리트 박스 및 그 조립방법
GB2474887B (en) * 2009-10-30 2013-12-04 Stats Uk Ltd Device and method for pre-tensioning a coupling
GB201003846D0 (en) * 2010-03-09 2010-04-21 Viking Intervention Technology Cablehead
CN104675122B (zh) * 2015-02-09 2017-06-16 北京市建筑工程研究院有限责任公司 无粘结预应力筋可控分段锚具装置及其装配方法和应用
CN104675022B (zh) * 2015-02-09 2017-04-26 北京市建筑工程研究院有限责任公司 无粘结预应力筋可控式锚具分段装置及其装配方法和应用
US20200040593A1 (en) * 2017-01-17 2020-02-06 Danmarks Tekniske Universitet A reinforcement system and a method of reinforcing a structure with a tendon
US10745916B2 (en) * 2018-05-03 2020-08-18 Precision-Hayes International Inc. Intermediate coupler for concrete reinforcement
US10995494B2 (en) * 2019-05-28 2021-05-04 Felix Sorkin Apparatus for repairing a tension member

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Also Published As

Publication number Publication date
DK161159C (da) 1991-11-25
FI78760C (fi) 1989-09-11
CA1274702A (en) 1990-10-02
NO163750C (no) 1990-07-11
DK161159B (da) 1991-06-03
FI78760B (fi) 1989-05-31
CH665444A5 (de) 1988-05-13
FI860174A0 (fi) 1986-01-15
CN86100147A (zh) 1986-09-24
AT390101B (de) 1990-03-26
AU5211186A (en) 1986-07-24
TR22659A (tr) 1988-02-08
PT81852A (de) 1986-02-01
PT81852B (pt) 1990-02-08
GR860107B (en) 1986-05-15
JPH0654052B2 (ja) 1994-07-20
IN164583B (zh) 1989-04-15
DK20386D0 (da) 1986-01-16
KR860005944A (ko) 1986-08-16
US4724639A (en) 1988-02-16
ZA8644B (en) 1986-08-27
ATA68485A (de) 1989-08-15
CN1006728B (zh) 1990-02-07
EP0190989A1 (de) 1986-08-13
DK20386A (da) 1986-07-18
MY101866A (en) 1992-01-31
DE3667085D1 (en) 1989-12-28
KR950006576B1 (ko) 1995-06-19
JPS61169560A (ja) 1986-07-31
NO855310L (no) 1986-07-18
SG54191G (en) 1991-08-23
NO163750B (no) 1990-04-02
FI860174A (fi) 1986-07-18
AU582204B2 (en) 1989-03-16

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