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EP2372036A1 - Dispositif d'ancrage d'une barre de mise en tension - Google Patents

Dispositif d'ancrage d'une barre de mise en tension Download PDF

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Publication number
EP2372036A1
EP2372036A1 EP11450033A EP11450033A EP2372036A1 EP 2372036 A1 EP2372036 A1 EP 2372036A1 EP 11450033 A EP11450033 A EP 11450033A EP 11450033 A EP11450033 A EP 11450033A EP 2372036 A1 EP2372036 A1 EP 2372036A1
Authority
EP
European Patent Office
Prior art keywords
wedge
anchor
reduction
tendon
anchoring
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.)
Withdrawn
Application number
EP11450033A
Other languages
German (de)
English (en)
Inventor
Hermann Thal
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2372036A1 publication Critical patent/EP2372036A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
    • 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

Definitions

  • the invention relates to an anchorage for tendons, in particular tension strands, for prestressing of structures, with an anchor body in which each tie member each an anchor wedge and a reduction wedge with oriented in the direction of the structure to be pretensioned wedge tips are mounted axially displaceable in succession about the clamping member.
  • Such anchoring for tendons is common, for example, in bridge construction.
  • a plurality of tendons in particular prestressing strands or tie rods, anchored in vorzuspannenden structure.
  • the loaded on train tendons are also anchored at the other end accordingly and give the produced structure, such as a bridge, the required stability.
  • An anchorage for tendons of the subject type is for example from the EP 0 197 912 B1 known.
  • For the preparation of the anchoring a support of the anchor body via an intermediate member to the anchor plate on vorzuspannenden structure is required. This intermediate member is removed before the tensioning of the tendons, whereby the manufacturing cost is increased.
  • the aim of the present invention is to provide an abovementioned anchoring, which is particularly suitable for highly dynamic applications.
  • the anchoring is to achieve a high static and dynamic resistance of the tendons. Disadvantages of known constructions should be avoided or at least reduced.
  • the object of the invention is achieved by an above-mentioned anchoring for tendons, wherein between each anchor wedge and each reduction wedge in each case a pressure ring is arranged, so that displacement of the anchor wedge results in a displacement of the reduction wedge.
  • a pair of wedges consisting of the anchor wedge and the reduction wedge provided, which cooperates due to the interposed pressure ring.
  • the tandem arrangement of the anchor wedge and reduction wedge at each tendon allows anchoring of the tendon by force on the anchor wedge, which thus causes a shift of the reduction wedge on the pressure ring.
  • the use of an intermediate member between the anchor body and the anchor plate on the vorzuspannenden structure is not required.
  • the anchor body and the pressure ring are preferably made of medium strength steel, and the anchor wedge is preferably made of high quality surface hardened steel. These materials are able to withstand the occurring forces.
  • the anchor body is formed from a base body for receiving the anchor wedge and a preferably connectable to the body wedge bushing for receiving the reduction wedge , In such a two-part embodiment of the anchor body, the manufacture and assembly is simplified.
  • the base body and the wedge bushing of the anchor body are screwed together via a thread.
  • the wedge can also be inserted only in a corresponding bore or recess of the anchor body without thread.
  • each pressure ring has a substantially T-shaped cross-section.
  • the wedge tip of the anchor wedge acts on that part of the pressure ring with a smaller diameter and transmits the forces on the opposite part of the pressure ring with a larger diameter and subsequently on the broad part of the reduction wedge.
  • Each reduction wedge is preferably formed of a material which is softer than the material of the tendon. This ensures that the surface of the reduction wedge presses into the tendon, in particular the tension strands, and causes it to optimally support it.
  • the tendon made of steel or another relatively hard metal are in particular plastic, soft metal or hardwood as materials for the reduction wedge especially.
  • the anchor wedge is preferably made of surface hardened steel.
  • the reduction wedge may also have a coating on the surface facing the tendon. This coating is preferably formed of a softer material than that of the tendon.
  • a sleeve can be arranged around the tensioning element, which sleeve presses into the surface of the tensioning element during anchoring. Accordingly, the sleeve is also formed of a softer material than the material of the tendon.
  • Each anchor wedge and / or each reduction wedge may also consist of several ring sector-shaped segments, for example of two or three segments.
  • an anchor body is provided for the storage of a plurality of tendons. Due to the construction of the anchoring according to the invention, it is possible every tendon to individually pretension and anchor, without requiring pressing with enormously high pressing forces.
  • Fig. 1 shows a cross section of an anchorage for a tendon 1 in particular in the form of a prestressing strand for prestressing of structures 2, for example of bridges.
  • the tendon 1 is arranged in the building 2.
  • the anchoring for the tendon 1 is based on an anchor plate 3 on the vorzuspannenden structure 2 from.
  • the anchoring consists of an anchor body 4, in which a pair of wedges, consisting of an anchor wedge 5 and a reduction wedge 6, are mounted axially displaceable around the tendon 1 with wedge tips oriented in the direction of the structure 2 to be pretensioned.
  • the anchor body 4 consists of a base body 8, in which the anchor wedge 5 is arranged, and a wedge bushing 9, in which the reduction wedge 6 is arranged.
  • the anchor wedge 5 is preferably made of surface hardened steel. This is the surface of the anchor wedge 5 harder than the steel usually used as the material for the tendon 1.
  • the reduction wedge 6 is made of a material which is softer than that of the tendon 1, for example made of plastic, soft metal or hardwood. According to the invention, a pressure ring 7 is arranged between the anchor wedge 5 and the reduction wedge 6, so that upon displacement of the anchor wedge 5 a displacement of the reduction wedge 6 results.
  • Fig. 2 shows the anchorage for a tendon 1 according to Fig. 1 in exploded view.
  • the components namely the main body 8 and the wedge 9 of the anchor body 4, the anchor wedge 5, the reduction wedge 6 and the pressure ring 7 can be seen.
  • a structure 11, in particular notches or grooves, may be provided, through which the anchoring is ensured by clamping.
  • the reduction wedge 6 may be provided on the side facing the tendon 1 with a coating 12, preferably of a softer material than the material of the tendon 1.
  • Fig. 3 shows the situation when tensioning the tendon 1, wherein in the direction of arrow X, a corresponding clamping force is exerted on the tendon 1.
  • a screw connection of the wedge bush 9 with the main body 8 of the anchor body 4 via a thread 10 is not absolutely necessary. If the wedge bushing 9 can be supported on the anchor plate 3, a construction is conceivable in which the wedge bushing 9 is merely inserted into a bore or recess provided in the main body 8 of the anchor body 4 (not shown).
  • Fig. 4 shows the anchoring of the tendon 1 in vorzuspannenden structure 2, wherein a corresponding pressing force along the arrows Y is exerted on the anchor wedge 5.
  • This results in an axial displacement of the anchor wedge 5 in the direction of the structure 2 until the tip of the anchor wedge 5 impinges on the pressure ring 7 and this moves in the direction of reduction wedge 6.
  • This will a part of the force transmitted to the reduction wedge 6, which is pressed into the corresponding conical bore in the wedge 9 and is thereby compressed and penetrates into the surface of the tendon 1.
  • the tendons 1 can be anchored individually under the exercise of relatively low forces Y. As a result, pressing with lower forces are required, making handling much easier.
  • Fig. 5 shows the top view of an anchorage for a plurality (here 19) of tendons 1 in a common anchor body. 4
  • Fig. 6 shows a section through the anchorage according to Fig. 5 along the section line VI-VI in a slightly enlarged scale.
  • an anchor wedge 5, a reduction wedge 6 and the intermediate pressure ring 7 in the common anchor body 4 are arranged.
  • the anchor body 4 is supported on a perforated plate 13 and the underlying anchor plate 3 on vorzuspannenden structure 2 from.
  • the perforated plate 13 may be formed, for example, of plastic. Due to the construction of the anchoring according to the invention, the tensioning and relaxing of the tendons 1 can also be done individually. As a result, a press with correspondingly lower pressing force is required for tensioning and relaxing the individual tendons 1. Alternatively, of course, several or all of the tendons 1 anchoring with a correspondingly large press with a correspondingly high pressing force can be simultaneously stretched or relaxed.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
EP11450033A 2010-03-22 2011-03-09 Dispositif d'ancrage d'une barre de mise en tension Withdrawn EP2372036A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT4532010A AT509076B1 (de) 2010-03-22 2010-03-22 Verankerung für spannglieder

Publications (1)

Publication Number Publication Date
EP2372036A1 true EP2372036A1 (fr) 2011-10-05

Family

ID=43877269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11450033A Withdrawn EP2372036A1 (fr) 2010-03-22 2011-03-09 Dispositif d'ancrage d'une barre de mise en tension

Country Status (2)

Country Link
EP (1) EP2372036A1 (fr)
AT (1) AT509076B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103343593A (zh) * 2013-07-25 2013-10-09 长沙理工大学 一种高精度自由调控的预应力筋锚具
CN111594242A (zh) * 2020-05-15 2020-08-28 浙江聚能岩土锚固研究有限公司 预应力涨壳锚杆及其施工方法
CN113897863A (zh) * 2021-09-06 2022-01-07 龚鹏鹏 一种组合式预应力锚具
CN114592512A (zh) * 2022-03-11 2022-06-07 深圳市工勘岩土集团有限公司 减少锚垫板尺寸和厚度的锚固结构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103539042B (zh) * 2012-07-16 2015-09-16 甘肃第一建设集团有限责任公司 螺旋退锚器及其使用方法
CN103009478B (zh) * 2012-12-21 2014-10-01 中铁九局集团有限公司桥梁分公司 一种张拉锁定及无损放张装置
CN103321150B (zh) * 2013-07-04 2014-12-10 南通大学 应用于纤维增强复合材料筋拉索的可调预紧力摩擦式锚具

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534989A (en) * 1968-05-29 1970-10-20 Joslyn Mfg & Supply Co End fitting
DE2512114A1 (de) * 1975-03-19 1976-09-30 Intercontinentale Technik Gmbh Endverankerung fuer spannelemente
EP0197912B1 (fr) 1985-03-05 1990-04-11 Vorspann-Technik Gesellschaft m.b.H. Ancrage pour armature de précontrainte
JPH07189427A (ja) * 1993-12-27 1995-07-28 Tokyo Seiko Co Ltd Ｆｒｐ補強材の端末定着構造
EP1227200A1 (fr) * 2001-01-29 2002-07-31 VSL International AG Dispositif d'ancrage d'une extrémité de hauban à une base
AT412564B (de) * 2003-12-22 2005-04-25 Burtscher Stefan L Dipl Ing Dr Keilverankerung für vorgespannte und/oder belastete zugelemente
WO2009042241A1 (fr) * 2007-09-25 2009-04-02 Sorkin Felix L Appareil pour empêcher le rétrécissement d'une gaine sur un tendon

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534989A (en) * 1968-05-29 1970-10-20 Joslyn Mfg & Supply Co End fitting
DE2512114A1 (de) * 1975-03-19 1976-09-30 Intercontinentale Technik Gmbh Endverankerung fuer spannelemente
EP0197912B1 (fr) 1985-03-05 1990-04-11 Vorspann-Technik Gesellschaft m.b.H. Ancrage pour armature de précontrainte
JPH07189427A (ja) * 1993-12-27 1995-07-28 Tokyo Seiko Co Ltd Ｆｒｐ補強材の端末定着構造
EP1227200A1 (fr) * 2001-01-29 2002-07-31 VSL International AG Dispositif d'ancrage d'une extrémité de hauban à une base
AT412564B (de) * 2003-12-22 2005-04-25 Burtscher Stefan L Dipl Ing Dr Keilverankerung für vorgespannte und/oder belastete zugelemente
WO2009042241A1 (fr) * 2007-09-25 2009-04-02 Sorkin Felix L Appareil pour empêcher le rétrécissement d'une gaine sur un tendon

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103343593A (zh) * 2013-07-25 2013-10-09 长沙理工大学 一种高精度自由调控的预应力筋锚具
CN111594242A (zh) * 2020-05-15 2020-08-28 浙江聚能岩土锚固研究有限公司 预应力涨壳锚杆及其施工方法
CN113897863A (zh) * 2021-09-06 2022-01-07 龚鹏鹏 一种组合式预应力锚具
CN113897863B (zh) * 2021-09-06 2024-04-30 柳州市东桥预应力科技有限公司 一种组合式预应力锚具的使用方法
CN114592512A (zh) * 2022-03-11 2022-06-07 深圳市工勘岩土集团有限公司 减少锚垫板尺寸和厚度的锚固结构

Also Published As

Publication number Publication date
AT509076B1 (de) 2011-06-15
AT509076A4 (de) 2011-06-15

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