EP3358106A1 - Procédé et dispositif de relâchement d'un élément de serrage - Google Patents

Procédé et dispositif de relâchement d'un élément de serrage Download PDF

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Publication number
EP3358106A1
EP3358106A1 EP18154904.9A EP18154904A EP3358106A1 EP 3358106 A1 EP3358106 A1 EP 3358106A1 EP 18154904 A EP18154904 A EP 18154904A EP 3358106 A1 EP3358106 A1 EP 3358106A1
Authority
EP
European Patent Office
Prior art keywords
force
holding
relaxation
force device
clamping
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.)
Pending
Application number
EP18154904.9A
Other languages
German (de)
English (en)
Inventor
Werner Brand
Marcus SCHRAML
Duarte ABECASIS
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.)
Dywidag Systems International GmbH
Original Assignee
Dywidag Systems International GmbH
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 Dywidag Systems International GmbH filed Critical Dywidag Systems International GmbH
Publication of EP3358106A1 publication Critical patent/EP3358106A1/fr
Pending 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
    • 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
    • E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
    • 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
    • E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • 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
    • 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

Definitions

  • the invention relates to a method and a device for relaxing a tensioning element according to the preamble of claim 1 or the preamble of claim 4.
  • both the support of the power device and the attachment of the relaxation device on the building can be made indirectly and / or directly.
  • the indirect support or attachment can preferably take place with the mediation of one of the anchoring devices of the building.
  • the supernatant of the clamping element or the clamping elements behind the anchoring arrangement usually chosen so large that the clamping element at the time of its complete relaxation still slightly beyond the anchoring arrangement.
  • the required protrusion length is mainly dependent on the length of the clamping element in addition to the clamping force and the modulus of elasticity of the clamping element. Since this can be more than 100m, this can lead to very large protrusion lengths and thus also to very long caps, which permanently protect the freely accessible part of the anchorage.
  • behind the anchoring arrangements of the space required for the arrangement of these caps space must be provided. This can lead to uneconomic dimensions of the anchoring areas.
  • the interior of the caps must be filled with anti-corrosion agent, which also represents a significant cost factor.
  • the anchoring device can enforce one of the two sections of the structure.
  • the projection of the clamping element and the cap enclosing this can be arranged on one side of the building section, namely on the side facing away from the other building section side of the considered building section, while the relaxation device can be arranged on the other side of the considered building section, namely on the side of the considered building section facing the other building section, ie between the two building sections or, in other words, between the two anchoring arrangements.
  • a generic method and a generic device are for example from the US 2002/0113231 A1 known.
  • a damping device which damps the deceleration movement of the clamping element, is attached to it prior to severing. But actually controlled movement of the clamping element can not ensure this procedure.
  • an “active force device” is understood to be a force device which can be supplied by supplying energy, for example in the form of a hydraulic medium, in particular hydraulic oil, hydraulically or / and in the form of a pneumatic medium, in particular compressed air, pneumatically or / and in the form of electrical Electric motor adjustable and designed to actively due to the power supply a force on the clamping element exercise. That is, the terms “active” and “passive” are used in the context of the present invention in the same manner as in the chassis technology of motor vehicles, where one speaks of a passive landing gear, when the landing gear on the forces acting from outside through Damping responds, while when the landing gear is able to counteract the external forces by supplying energy, speaks of an active suspension. In this sense, from the US 2002/0113231 A1 known damper is a passive power device.
  • the present invention used active power device on the clamping element exert a force that prevents relaxation of the clamping element. Only when an operator actuates the force device accordingly, the part of the force device having the holding device is moved relative to the part of the force device connected to the base unit such that the tensioning element is relaxed. In this way, the clamping element can be relaxed completely controlled.
  • the relaxation device comprises a base unit on which the force device is supported.
  • the base unit can be formed for example by a frame and / or a housing. Furthermore, the base unit can be attached to one of the anchoring devices of the building or / and directly to the building.
  • the holding device of the at least one power device may comprise at least one clamping wedge, preferably a plurality of clamping wedges, as known per se from the anchoring of the clamping element to the anchoring devices.
  • the holding device may comprise a base bearing, which is arranged on the movable part of the at least one force device and adapted to engage around the clamping element.
  • the base camp may have a plurality of, for example two, Include elements that receive the clamping element between them and can then be connected to each other, for example by tightening or screwing.
  • the base bearing may comprise a recess for the passage of the clamping element and for receiving the at least one clamping wedge.
  • the holding engagement of the holding device is a clamping engagement mediated by the at least one clamping wedge.
  • the base bearing can be guided on the base unit in a direction that runs essentially parallel to the longitudinal extension of the tensioning element. As a result, the movement of the base camp can be facilitated by the associated power tool.
  • the holding device of the at least one force device can be actuated by hand, for example.
  • the above-described operation steps can be performed by one or more operators by hand.
  • the holding device of the at least one power device is automatically actuated.
  • further force devices can be provided, which take over the actuating steps described above.
  • the further holding device can also be a manually operable or an automatically operable holding device.
  • the construction of the further holding device reference is made to the above explanation of the structure of the holding device of the at least one force device, wherein, however, the base bearing of the further holding device is preferably fastened to the base unit of the relaxing device.
  • the interaction of the further holding device with the at least one force device makes it possible to use cost-effective strength devices, in particular force devices whose stroke is smaller than the relaxation path required for the complete relaxation of the tension element. In addition, this limits the space required for the relaxation device space. In particular, it is thus possible to keep the relaxation device shorter than the path length which is anyway required adjacent the anchoring devices in order to widen the bundle of the clamping elements of the tensioning member starting from their closely adjacent course in preparation for anchoring in the anchoring devices.
  • the further holding device can be arranged both on the side of the at least one force device facing the associated anchoring device and on the side of the at least one force device facing away from the associated anchoring device.
  • the further holding device and the at least one force device can be supported on a common section of the base unit, preferably on a section of the base unit surrounding the clamping element.
  • the object of the invention is also achieved by a device for relaxing a tensioning element, which by means of two of the relaxation device not belonging Anchoring arrangements between two sections of the relaxation device also not belonging structure with a given clamping force is clamped, in particular for carrying out the method according to the invention
  • the relaxation device comprising at least one force device, which is designed on the one hand, supported on the building at a location located between the two anchoring arrangements body on the other hand, a holding device which is intended to come into holding engagement with the clamping element, wherein the at least one force device is an active force device, which is designed both in terms of taking over the clamping force of the clamping element and thus relieving the anchoring device as well as to be operated in the sense of relaxing the clamping element.
  • the expansion device can be provided based on the process variants of the expansion process according to the invention in accordance with a first alternative development that these at least one further holding device for producing a retaining engagement with the tensioning element, whereas according to a second alternative development the tensioning device may be provided to comprise, in addition to the at least one (first) active force device, at least one second active force device comprising a holding device for producing a retaining engagement with the tensioning element ,
  • the structure can be, for example, a bridge or a tower in which the tendons are arranged to extend outside and / or inside the building.
  • the Scope but non-limiting examples are here cable-stayed bridges and wind towers, ie the towers of wind turbines, mentioned.
  • the clamping elements may be formed in a conventional manner of wires or strands or rods. Frequently tensioning elements are used which comprise strands formed by seven steel wires. Each of the steel wires may be galvanized to provide initial corrosion protection. Furthermore, the strand may be coated with anticorrosion composition, for example a corrosion protection wax or grease, as the second corrosion protection and, if desired, coated as a third corrosion protection with a plastic jacket, for example a polyethylene jacket.
  • anticorrosion composition for example a corrosion protection wax or grease
  • a plastic jacket for example a polyethylene jacket.
  • Such clamping elements can also be used according to the invention, wherein it may be necessary to enable the holding engagement to remove the plastic shell on a portion of the length of the clamping element of this.
  • each tendon may comprise at least one such tensioning element.
  • FIG. 1 a part of a cable-stayed bridge 100 is shown as an example of a building, in which the invention can be used with advantage.
  • FIG. 1 illustrated the lower anchor assembly 102 of the structure 100, which is located in the region of the bridge deck 104.
  • a clamping element 108 comprising a plurality of clamping elements 106 extends to the upper anchoring arrangement 103 (not shown), which is located on the pylon of the cable-stayed bridge 100.
  • the anchor assembly 102 includes an anchor block 110 having a plurality of passageways 112 each of which is for passage of one of the tension members 106.
  • the clamping elements 106 are anchored in the anchor block 110 by means of clamping wedges 114.
  • On its outer peripheral surface of the anchor block 110 is threadedly engaged with an anchor nut 116, which in turn is supported on an integrated into the structure 100 anchor plate 118.
  • On the rear side of the anchor plate 118, the anchoring arrangement 102 further comprises a receiving tube 120, which passes through a passage opening 122 of the structure 100 and exits the structure 100 on the side remote from the anchor plate 118.
  • the anchor block 110, the clamping wedges 114, the anchor nut 116, the anchor plate 118 and the receiving tube 120 together form the anchoring device 124 associated with the anchoring arrangement 102.
  • FIG. 1 a relaxation device 130 according to the invention shown, which for carrying out the relaxation process according to the invention the projecting from the structure 100 end 120a of the receiving tube 120 is attached.
  • the detailed structure of the expansion device 130 and the detailed procedure of the expansion process will be described below with reference to FIGS Figures 2 and 3a to 3f be explained in more detail:
  • the expansion device 130 comprises a frame 132 which, in the exemplary embodiments shown, has four threaded rods 134, which run essentially parallel to the longitudinal extension direction L of the tensioning element 106 and the tensioning element 106 are arranged between them.
  • the anchoring device 124 facing ends 134a of the threaded rods 134 are attached to mounting plates 136, in particular screwed to these, which in turn are attached to the end 120a of the receiving tube 120.
  • the ends 134b of the threaded rods 134 facing away from the anchoring device 124 are connected in pairs by means of mounting plates 138.
  • This structure has the advantage that the frame 132 of the expansion device 130 can be arranged in a simple manner around the clamping member 108 or the plurality of clamping elements 106.
  • the frame 132 in the form of two half-shells interconnected by means of a hinge, which can be closed around the clamping member 108, connected to one another and fastened to the receiving tube 120.
  • the expansion device 130 comprises a first holding device 140 and a second holding device 142, both of which can be brought into holding engagement with the clamping element 106, for example by means of clamping wedges 144 and 146.
  • the second holding device 142 is rigidly supported directly on the mounting plates 138, while the first holding device 140 via two active force devices 148 in the longitudinal direction L is adjustable.
  • the two force devices 148 are supported in the illustrated embodiments via the second holding device 142 to the mounting plates 138.
  • the two power tools 148 are formed in all the illustrated embodiments as double-acting hydraulic units.
  • the two holding devices 140 and 142 each have a through-channel 140a or 142a for receiving the clamping element 106.
  • the two holding devices 140 and 142 In order to insert the clamping element 106 in a simple manner in the respective through-channel 140a and 142a, the two holding devices 140 and 142 each of two Mounting strips 150 formed, which are screwed together during operation of the expansion device 130.
  • the force devices 148 are in an almost completely extended state in this initial situation, ie the relative ones to the base cylinder 148a of the power devices 148 displaceable piston rods 148b are in a state almost completely extended from the base cylinders 148a.
  • the holding device 140 can be guided on the frame 132, as shown in FIG. 2 only schematically indicated by a dashed arc 154.
  • the holding engagement of the first holding device 140 made.
  • the clamping wedges 144 are inserted into the through-channel 140a, so that they bear against the outer peripheral surface of the clamping element 106 in a clamping manner.
  • the power devices 148 transferred to their fully extended state.
  • the first holding device 140 assumes the clamping force of the clamping element 106 substantially completely, so that the anchoring of the clamping element 106 in the anchor block 110 becomes powerless.
  • the anchoring of the tensioning element 106 in the anchor block 110 can be canceled by the clamping wedges 114 are removed from the passageway 112.
  • the clamping wedges 114 can be removed in practice from the clamping element 106, they are in the FIGS. 3c to 3f for clarity of illustration at some distance from the throughbore 112.
  • the force devices 148 are then shortened, so that the first holding device 140 is removed from the anchoring device 124, whereby the clamping element 106 is at least partially relaxed.
  • the holding device 140 "grips". For this purpose is according to FIG. 3e
  • the second holding device 142 is brought into holding engagement with the clamping element 106, in which the clamping wedges 146 are inserted into the through-channel 142a.
  • the clamping force of the clamping element 106 is transferred from the first holding device 140 to the second holding device 142 by the force devices 148 starting from the in 3d figure shown position in its fully shortened position according to FIG. 3e be transferred.
  • the second holding device 142 holds the remaining clamping force of the clamping element 106.
  • the holding engagement of the first holding device 140 can be solved. This is in FIG. 3e characterized in that the retaining wedges 144 are shown at a certain distance from the first holding device 140.
  • the force devices 148 according to FIG. 3f be transferred back to the almost fully extended position, as they are already in FIG. 3b was shown.
  • the condition according to FIG. 3b and the state according to FIG. 3f differ from each other only in that the holding force of the clamping element 106 according to FIG. 3f is held by the second holding device 142, while according to FIG. 3b was held by the anchor 124.
  • clamping wedges 146 can be re-inserted into the passageway 140a and the force devices 148 transferred to their fully extended position, so that the first holding device 140 in turn takes over the clamping force of the clamping element 106 and the holding engagement of the second holding device 142 can be released. This corresponds to the already in Figure 3c illustrated state.
  • FIG. 4 a second embodiment of the expansion device according to the invention is shown, which is substantially the first embodiment according to FIG. 2 equivalent. Therefore, in FIG. 4 Analog parts provided with the same reference numerals as in FIG. 2 but increased by the number 100.
  • the expansion device 230 according to FIG. 4 in the following will be described only insofar as they are of the relaxation device 130 according to FIG. 2 which is expressly referred to herewith.
  • the expansion device 230 according to FIG. 4 differs from the relaxation device 130 according to FIG. 2 in that the second holding device 242 is arranged on the receiving tube 220 facing side of the first holding device 240. As a result, the force devices 248 are supported directly on the mounting rails 238. Furthermore, the frame 232 has additional mounting strips 238 ', on which the second holding device 242 is supported.
  • FIG. 5 a third embodiment of a relaxation device according to the invention is shown, which is substantially the second embodiment according to FIG. 4 equivalent. Therefore, in FIG. 5 Analog parts provided with the same reference numerals as in FIG. 4 but increased by the number 100.
  • the expansion device 330 according to FIG. 5 in the following will be described only insofar as they are of the relaxation device 230 according to FIG. 4 which is expressly referred to herewith.
  • both holding devices 340 and 342 power devices 348 and 352 associated with each other directly to the mounting strips 338 and 338 'of the frame 332 of Support relaxation device 330.
  • the holding devices 340 and 342 work alternately in the sense of relaxation of the clamping element 306.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Wind Motors (AREA)
EP18154904.9A 2017-02-07 2018-02-02 Procédé et dispositif de relâchement d'un élément de serrage Pending EP3358106A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017201907.7A DE102017201907A1 (de) 2017-02-07 2017-02-07 Verfahren und Vorrichtung zum Entspannen eines Spannelements

Publications (1)

Publication Number Publication Date
EP3358106A1 true EP3358106A1 (fr) 2018-08-08

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ID=61157097

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EP18154904.9A Pending EP3358106A1 (fr) 2017-02-07 2018-02-02 Procédé et dispositif de relâchement d'un élément de serrage

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EP (1) EP3358106A1 (fr)
DE (1) DE102017201907A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020161091A1 (fr) * 2019-02-04 2020-08-13 Wobben Properties Gmbh Dispositif et procédé pour détendre un fil de précontrainte
FR3121456A1 (fr) * 2021-04-06 2022-10-07 Soletanche Freyssinet Procede pour ôter une armature d’un cable de structure et systeme associe

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117940633A (zh) 2021-09-24 2024-04-26 Vsl国际股份公司 用于松放结构元件或张紧元件的松放系统和方法
WO2024183893A1 (fr) 2023-03-07 2024-09-12 Vsl International Ag Dispositif de serrage, système de détente et procédé associé pour serrer un objet tel que des éléments structuraux ou des éléments de tension

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754673A (en) * 1980-09-17 1982-04-01 Kensetsu Kiso Eng Pc steel mater al fixing apparatus with unloading mechanism
JPS5988570A (ja) * 1982-11-10 1984-05-22 黒沢建設株式会社 Ｐｃ鋼材の緊張解除方法
JPS63312468A (ja) * 1987-06-11 1988-12-20 大成建設株式会社 ポストテンション工法におけるテンドンの緊張力解除方法
JPH06330630A (ja) * 1993-05-19 1994-11-29 Taisei Corp プレストレスの解除方法
FR2745829A1 (fr) * 1996-03-08 1997-09-12 Baudin Chateauneuf Procede et dispositif pour le remplacement d'un cable ou organe analogue de transmission d'efforts

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2951047A1 (de) 1979-12-19 1981-06-25 Brown, Boveri & Cie Ag, 6800 Mannheim Wechselvorrichtung
FR2818676B1 (fr) 2000-12-27 2003-03-07 Freyssinet Int Stup Procede de demontage d'un cable de precontrainte et dispositif pour la mise en oeuvre
FR2904637A1 (fr) 2006-08-02 2008-02-08 Freyssinet Soc Par Actions Sim Procede de demontage d'un cable tendu, systeme et dispositifs associes.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5754673A (en) * 1980-09-17 1982-04-01 Kensetsu Kiso Eng Pc steel mater al fixing apparatus with unloading mechanism
JPS5988570A (ja) * 1982-11-10 1984-05-22 黒沢建設株式会社 Ｐｃ鋼材の緊張解除方法
JPS63312468A (ja) * 1987-06-11 1988-12-20 大成建設株式会社 ポストテンション工法におけるテンドンの緊張力解除方法
JPH06330630A (ja) * 1993-05-19 1994-11-29 Taisei Corp プレストレスの解除方法
FR2745829A1 (fr) * 1996-03-08 1997-09-12 Baudin Chateauneuf Procede et dispositif pour le remplacement d'un cable ou organe analogue de transmission d'efforts

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020161091A1 (fr) * 2019-02-04 2020-08-13 Wobben Properties Gmbh Dispositif et procédé pour détendre un fil de précontrainte
US20220010577A1 (en) * 2019-02-04 2022-01-13 Wobben Properties Gmbh Device and method for releasing a stressing strand
FR3121456A1 (fr) * 2021-04-06 2022-10-07 Soletanche Freyssinet Procede pour ôter une armature d’un cable de structure et systeme associe

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