EP3336258A1 - Ancrage terminal pour un ancre de roche et/ou de sol - Google Patents

Ancrage terminal pour un ancre de roche et/ou de sol Download PDF

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Publication number
EP3336258A1
EP3336258A1 EP16204805.2A EP16204805A EP3336258A1 EP 3336258 A1 EP3336258 A1 EP 3336258A1 EP 16204805 A EP16204805 A EP 16204805A EP 3336258 A1 EP3336258 A1 EP 3336258A1
Authority
EP
European Patent Office
Prior art keywords
end anchorage
tension member
anchor
plate
anchorage according
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.)
Granted
Application number
EP16204805.2A
Other languages
German (de)
English (en)
Other versions
EP3336258B1 (fr
Inventor
Markus Halter
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.)
Stahlton AG
Original Assignee
Stahlton AG
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 Stahlton AG filed Critical Stahlton AG
Priority to EP16204805.2A priority Critical patent/EP3336258B1/fr
Publication of EP3336258A1 publication Critical patent/EP3336258A1/fr
Application granted granted Critical
Publication of EP3336258B1 publication Critical patent/EP3336258B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/24—Prefabricated piles
    • E02D5/28—Prefabricated piles made of steel or other metals
    • E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E02D5/808—Ground anchors anchored by using exclusively a bonding material
    • 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
    • E04C5/125—Anchoring devices the tensile members are profiled to ensure the anchorage, e.g. when provided with screw-thread, bulges, corrugations

Definitions

  • the invention relates to an end anchor for a ground and / or rock anchor, which comprises a tension member of at least one tension cord.
  • the tension member is anchored in the final anchorage slip-free as possible, so that in the displacement measurements in anchor tests and clamping samples for determining and controlling the sustainability of the ground no mixing of reactions of the ground and slippage takes place in the final anchorage.
  • An object of the present invention is to propose an end anchorage for a ground and / or rock anchor with a compact construction.
  • the end anchorage can be made compact. It is therefore not necessary to provide a borehole which has a diameter in excess.
  • Fig. 1 shows a longitudinal section through the end anchorage 1, z. B. on a pressure pipe of a pressure pipe anchor or generally on a support 11 of a rock and / or ground anchor by means of a transfer plate 3 is supported.
  • the tension member 2 of the armature is formed from tension strands 12, for example prestressing steel strands. These pass through bores in the transfer plate 3, then extend along a connection path and finally pass through bores in an anchor plate 5 (also referred to below as the "end plate”).
  • the transfer plate 3 has a support surface, which bears against the support 11.
  • the tension strands 12 are provided at their ends with upset heads 6, which are supported on the end plate 5 and are pressed by means of the pressure plate 10 to this.
  • the pressure plate 10 is bolted to the end plate 5 or connected in any other way with this.
  • the compression heads 6 are surrounded by the potting 8. This is made for example of a material based on cement, plastic and / or metal.
  • the forces of the compression heads 6 on the end plate 5 are transmitted to the transfer plate 3 via a steel tube 4, which is arranged between the plates 3 and 5 and surrounds the tension member 2.
  • the prestressing steel strands 12 of the tension member 2 in a backfill 7, cast grout for example, by composite on skin friction on the inner surface of the steel pipe 4 and upsetting the backfill 7 on the transfer plate 3 forces from the Tension member 2 on the transfer plate 3 on the support 11 ablate.
  • filling 7 diverse materials are conceivable, for example, cement-water mixture with the possible addition of one or more additives, such as. As propellants, plasticizers and setting accelerators, mortars based on plastic, etc.
  • the in the Fig. 1 illustrated end anchorage is designed for a dismantling of the tension member 2.
  • a separating device is provided to weaken or cut through the tensioning strands 12 as required.
  • the Separating device an induction coil 16 which surrounds the tension member 2 and this inductively heated during removal to the break.
  • the temperature required for this can be kept below the melting point of the tension member 2 if it is sufficiently pre-stressed during the heating process, typically with a force of at least 10%, preferably at least 25% and more preferably at least 50% of the tensile strength of the tension member 2 at 0 degrees Celsius.
  • the induction coil 16 is arranged closer to the plate 3 than to the plate 5, preferably subsequently to the plate 3, and is cast in the backfill 7.
  • a frequency converter such as a static frequency converter, which is connected via a along the tension member 12 extending power supply cable 17 to the induction coil 16.
  • This is preferably formed by a winding which is single or multi-layered and consists of a cable.
  • the power supply cable 17 is passed through an opening in the pipe 4.
  • the induction coil 16 extends spaced around the tension member 2 so as to prevent the heat generated in the tension member 2 during the heating process from melting the electrical insulation of the induction coil 16 and thus causing an electrical short circuit.
  • the induction coil 16 may, for. B. be arranged on or in a pipe section through which the tension member 2 extends and which is embedded in the backfill 7.
  • Fig. 2 shows a section through the composite section with the existing of the prestressing steel strands 12 tension member 2, which is connected via the grout 7 with the steel pipe 4.
  • prestressing steel strands 12 There are four prestressing steel strands 12 shown here. The number can also be different and be one, two or more. If the number is greater than one, then the prestressing steel strands 12 are preferably arranged symmetrically around the center, so that in each case the angle between two adjacent compression heads 6 is equal in the circumferential direction. It is also conceivable to provide at least one tension cord 12 in the center and to arrange the remaining, if present, as explained above symmetrically around the center.
  • each strand 12 seven individual wires 13 are shown. This number can also be different and be two, three or more.
  • the respective wire 13 of the strand 12 has a solid cross-section.
  • the respective strand 12 in Center on a wire 13 as a soul to which wires 13 are wound whose respective diameter is smaller than the diameter of the soul.
  • the pressure plate 10 presses the compression head 6 against the end plate 5 in order to cancel a possible game. Subsequent to the end plate 5, the prestressing steel strand 12 extends in the steel tube 4 which is filled with the grouting 7.
  • BBRV method Birkenmaier, Brandestini, Ros and Vogt is known (BBRV method), cf. CH 300 486.
  • This method can be transferred here to produce for anchoring a strand 12 with an upsetting head 6 as an end.
  • the end of a strand 12 is plunged in the cold state with a compression machine during manufacture.
  • the ends 14 of the individual wires 13 of a strand 12 are thereby compressed, so that they form a total of an upsetting head 6, whose diameter is increased compared to the diameter of the strand 12.
  • the swaging head 6 is therefore an integral part of the strand 12 and surprisingly has a high load capacity. This is typically at least 40% of the breaking load of the strand 12, preferably at least 50%.
  • this carrying capacity is at least 70%, preferably at least 90% and particularly preferably 100% of the breaking force of the strand 12.
  • Fig. 4 shows the section through the prestressing steel strand 12 with the here seven individual wires 13 in the region of the end plate 5. It can be seen the bore 5a in the end plate 5, through which the prestressing steel strand 12 extends.
  • Fig. 5 shows the section through a compression head 6, before the interstices 15 have been filled and poured around.
  • Fig. 6 shows the section through the upturned by the potting 8 upset head 6 with the individual wires 14, the interstices 15 are filled with the potting 9.
  • the end anchoring described here can be used in many ways as part of a ground and / or rock anchor.
  • the prefabricated anchor end anchor is inserted into a wellbore in the ground.
  • the anchor is z. B. formed as a pressure tube anchor.
  • the tension member over the entire anchor length freewheeling in a piping, z. B. out of PE and anchored in the borehole deepest by means of the final anchorage.
  • the end anchorage is based on the pressure tube, which is typically 1.5 to 4 meters long and is connected non-positively by casting with cement mortar for anchoring purposes to the ground.
  • the pressure tube may be made of one or more materials.
  • the anchorage can be used for anchors with retractable tension member or for permanently installed anchors, ie anchors without removable tension member.
  • the separating device for separating or weakening the tension member may be omitted.
  • Soil anchors and rock anchors with a retractable tension member are used in particular for securing construction pits.
  • the forces held in equilibrium by the anchors mainly due to active earth pressure, can usually be taken over by the construction of the structures, so that the function of the anchors becomes obsolete.
  • the anchors usually extend under neighboring properties, so that they represent an obstacle in the construction site there when left in construction.
  • the tension member made of prestressing steel strands is difficult to cut because of the high strength and toughness of the steel. Therefore, in many cases, the demand for a dismantling of anchors is charged.
  • the end anchor has a compact construction.
  • the end anchorage can be designed to be slim transversely to the direction of the well.
  • a stranded head has a smaller lateral extent than e.g. a strand, which is anchored with wedges or a compression sleeve.
  • the Litzenstauchkopf has a diameter which is smaller than 2 times the strand diameter and is z. B. 1.5 times the strand diameter. It is therefore possible to arrange the strands space saving than usual. Compared to the commonly used anchoring anchors without pressure pipe no larger diameter boreholes are required.
  • the end anchorage can also be kept short in the direction of the borehole.
  • the distance between the support 11 and the swaging head 6 or the swaging heads 6 is typically less than 1 m, preferably less than 0.50 m.
  • the tension member can be anchored in the final anchorage as possible slip-free, so that takes place in the displacement measurements in anchor tests and clamping samples for determining and controlling the sustainability of the ground no mixing of reactions of the ground and slippage in the final anchorage.
  • the slip that results in the final anchorage during tensioning of the tension member is less than 0.5 mm, preferably less than 0.2 mm and particularly preferably less than 0.1 mm.
  • a different number of strands 12 is provided for forming the tension member than shown in the figures.
  • a single strand 12 may be provided as a tension member having an upsetting head 6 for anchoring.
  • the number of strands may be one, two or more.
  • the number of wires 13 of a single strand 12 may be different than shown in the figures and be two, three or more.
  • the length of the composite route through the backfill 7 depends i.a. from the load bearing capacity of the BBRV strand dipping heads, i. the higher the load capacity of the compression heads, the shorter the connection distance can be. It is also conceivable to provide no connection line and to anchor the compression heads, for example, directly on the support, so that the anchor plate 5 rests on the support 11.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Piles And Underground Anchors (AREA)
EP16204805.2A 2016-12-16 2016-12-16 Ancrage d'extrémité pour une ancre de sol et/ou de roche Active EP3336258B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16204805.2A EP3336258B1 (fr) 2016-12-16 2016-12-16 Ancrage d'extrémité pour une ancre de sol et/ou de roche

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16204805.2A EP3336258B1 (fr) 2016-12-16 2016-12-16 Ancrage d'extrémité pour une ancre de sol et/ou de roche

Publications (2)

Publication Number Publication Date
EP3336258A1 true EP3336258A1 (fr) 2018-06-20
EP3336258B1 EP3336258B1 (fr) 2022-03-09

Family

ID=57614150

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16204805.2A Active EP3336258B1 (fr) 2016-12-16 2016-12-16 Ancrage d'extrémité pour une ancre de sol et/ou de roche

Country Status (1)

Country Link
EP (1) EP3336258B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113605239A (zh) * 2021-07-16 2021-11-05 柳州欧维姆机械股份有限公司 一种桥墩拼装用预应力锚固结构体系及其桥墩拼装施工方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH300486A (de) * 1952-02-05 1954-08-15 Birkenmaier Max Verfahren zur Herstellung von Stahldrahtankern und nach diesem Verfahren hergestellter Stahldrahtanker.
EP0124661A1 (fr) * 1983-05-03 1984-11-14 SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO. LTD. Ancrage pour un câble métallique
WO1986000655A1 (fr) * 1984-07-13 1986-01-30 Stump Bohr Gmbh Tirant d'ancrage et pieu

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008001248U1 (de) * 2008-01-28 2008-03-27 Dywidag-Systems International Gmbh Erd- oder Felsanker mit einem Ankerzugglied aus einem oder mehreren Einzelelementen mit korrosionsgeschützter Ankerkopfausbildung
DE102012017704A1 (de) * 2012-09-07 2014-03-13 Dywidag-Systems International Gmbh Anordnung zur hochfesten Verankerung eines einen Spannstab aufweisenden Spannglieds in einem Bauteil sowie Verfahren zur Herstellung einer solchen Verankerung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH300486A (de) * 1952-02-05 1954-08-15 Birkenmaier Max Verfahren zur Herstellung von Stahldrahtankern und nach diesem Verfahren hergestellter Stahldrahtanker.
EP0124661A1 (fr) * 1983-05-03 1984-11-14 SHINKO KOSEN KOGYO KABUSHIKI KAISHA also known as SHINKO WIRE CO. LTD. Ancrage pour un câble métallique
WO1986000655A1 (fr) * 1984-07-13 1986-01-30 Stump Bohr Gmbh Tirant d'ancrage et pieu

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113605239A (zh) * 2021-07-16 2021-11-05 柳州欧维姆机械股份有限公司 一种桥墩拼装用预应力锚固结构体系及其桥墩拼装施工方法

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Publication number Publication date
EP3336258B1 (fr) 2022-03-09

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