US3803785A - Anchoring means for tensioned member for heavy loads, for example, a slanted cable bridge - Google Patents

Anchoring means for tensioned member for heavy loads, for example, a slanted cable bridge Download PDF

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Publication number
US3803785A
US3803785A US00237951A US23795172A US3803785A US 3803785 A US3803785 A US 3803785A US 00237951 A US00237951 A US 00237951A US 23795172 A US23795172 A US 23795172A US 3803785 A US3803785 A US 3803785A
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United States
Prior art keywords
anchorage
tension
accordance
casing
concrete structure
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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 - Lifetime
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US00237951A
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English (en)
Inventor
U Finsterwalder
K Finsterwalder
R Buhrer
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.)
Walter Bau AG
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Dyckerhoff and Widmann AG
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Filing date
Publication date
Priority claimed from DE19712114863 external-priority patent/DE2114863C/de
Application filed by Dyckerhoff and Widmann AG filed Critical Dyckerhoff and Widmann AG
Application granted granted Critical
Publication of US3803785A publication Critical patent/US3803785A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • E04C5/125—Anchoring devices the tensile members are profiled to ensure the anchorage, e.g. when provided with screw-thread, bulges, corrugations
    • 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
    • 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
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/39—Cord and rope holders
    • Y10T24/3909—Plural-strand cord or rope

Definitions

  • ABSTRACT Anchorage for a tensioned tension member for heavy loads in a concrete structure component such as a slanting cable of a slanted cable bridge comprising a plurality of parallel tension members such as wires or litz, that are arranged together in a common cover and surrounded by cement mortar that fills the space of the cross section of the cover not occupied by the tension member and-which are fanned out in the direction of the anchorage, where the cover extends into the concrete structural part and is defined by a metal casing at least in the entrance area into the concrete part, and which, besides being connected with the tension members, is connected with the concrete part.
  • a concrete structure component such as a slanting cable of a slanted cable bridge
  • a plurality of parallel tension members such as wires or litz
  • the invention relates to anchoring means for a tensioned member for heavy loads, for example, of a slanted cable bridge which consists of a plurality of parallel tension elements such as wires, litz or the like, that are arranged together in a cover or casing and surrounded by cement mortar which fills that part of the cross section of the casing that is not occupied by the tension member and which is filled in after the tensioning and which are fanned out in the direction of the anchorage.
  • a tensioned member for heavy loads for example, of a slanted cable bridge which consists of a plurality of parallel tension elements such as wires, litz or the like, that are arranged together in a cover or casing and surrounded by cement mortar which fills that part of the cross section of the casing that is not occupied by the tension member and which is filled in after the tensioning and which are fanned out in the direction of the anchorage.
  • Wire cables and bundles of thin drawn steel wire which are anchored in an anchoring head and can be tensioned as a whole or unit are known as tension members for heavy loads, for example, oblique cable bridges that extend externally of a building structure.
  • tension members for heavy loads for example, oblique cable bridges that extend externally of a building structure.
  • cables of a large number of wires individual wires are fanned out towards the anchorage generally in the manner of a broom and are placed in a conical casing of cast or forged steel and are there firmly embedded by means of a casting masssuch as groutingQWith tension members of steel'wire bundles which are secured in anchor heads, for example, by means of wedge anchorages a similar method is used.
  • tension members of steel'wire bundles which are secured in anchor heads for example, by means of wedge anchorages a similar method is used.
  • very expensive devices in the form of heavy tension presses are required, because all individual elements must be tensioned simultaneously.
  • the improvement of the vibration resistance of the tension member which is of decisive importance above all for the endurance of a bridge is obtained in accordance with the invention by the separation of the introduction into the concrete structure of the permanent loads on the one hand and of the variable loads such as traffic loads on the other hand.
  • This is obtained in that first the individual elements are tensioned in a known manner in their anchorages and are then anchored against the hardened concrete. In this manner the permanent loads of the dead weight which already exist are imparted in this load condition into the concrete structure.
  • the traffic loads i.e.,.
  • the loads causing the vibration loads arise only after the injection of the remaining hollow spaces with cement mortar or cement glue, i.e., at a time when a connection exists by way of the cement mortar between the individual elements, the metal cover and the part of the concrete structure in which the entire tension member has been anchored.
  • These variable loads are then imparted to the metal cover or casing by way of the individual elements and are directly imparted by it to the concrete.
  • the actual anchorages of the individual elements will be freed of vibration loads to a considerable extent.
  • the metal cover has a constant wall thickness inside the concrete part and a decreasing wall thickness outside the concrete part.
  • the part of the metal cover located inside the concrete part should on its inside and/or on the outside be provided with means for in creasing the adhesion.
  • the wall of the metal cover may be provided with rivets.
  • tension members extending essentially parallel thereto for producing a prestressing in the concrete surrounding the metal casing. These tension members may be anchored on an anchoring ring which encompasses the metal cover.
  • the covering consisting of metal or plastic material such as polyethylene is connected to the easing in a force transmitting and unitary manner.
  • the tensioning elements may be surrounded between the metal casing and their existing anchorage by hull tubes individually embedded in the concrete structure part.
  • a perforated disk which permits the through-passage of the tension elements may be arranged, which together with an end plate which faces the anchoring bodies and encompasses the individual hull tubes forms an injection chamber.
  • the casing may be provided with spacing members for the parallel tensioning elements consisting'preferably of plastic such as polyethylene, which are defined by a plurality of sleeves each enclosing a tension element arranged upon a number of concentric rings which are connected with each other and whose inner diameter is somewhat greater than the outer diameter of the tension elements.
  • spacing members for the parallel tensioning elements consisting'preferably of plastic such as polyethylene, which are defined by a plurality of sleeves each enclosing a tension element arranged upon a number of concentric rings which are connected with each other and whose inner diameter is somewhat greater than the outer diameter of the tension elements.
  • One of the sleeves preferably the one sleeve arranged in the center, may be provided with means whereby it is held on the tensioning element that passes through it.
  • the sleeve may have an internal thread by means of which it is threaded onto a tensioning element that has a corresponding thread.
  • the length of the thread can be selected in a manner that it can be sheared off as the tensioning element is tensioned.
  • FIG. 1 is a longitudinal section through the tensioning element in accordance with the invention in the area of the anchorage;
  • FIG. 2 is a cross section along line IIII of FIG. 1, and
  • FIG. 3 is a cross section along line III-III of FIG. 1.
  • the tensioning member 1 in accordance with the invention consists in the free area outside of the structural concrete part (right part of FIG. 1) of a number of individual tensioning elements 2 which are arranged in the manner of an annulus inside a tubular cover 3 (see FIG. 2).
  • the tubular cover 3 may consist of plastic, for example polyethylene, or sheet steel.
  • the tensioning elements are so arranged inside the tubular covering 3 that a tensioning element 2' is disposed at the center and the remaining tensioning elements 2 are disposed around it in the manner of concentric rings.
  • the tensioning elements 2, 2 consist of rolled threads which are rolled to a diameter of 16 mm. so that in practice they can be supplied as endless wires. In the same manner it is also possible to utilize cables, litz wire or the like.
  • the individual tensioning elements 2 are kept at predetermined distances from one another by means of spacers 4 (FIG. 2).
  • the spacers 4 are made of plastic, for example polyethylene; they are composed of a number of sleeves 5 each of which encompasses an element 2 and are connected with one another by means of bridges 6 or 7.
  • the inner diameter of the sleeves 5 is greater than the outer diameter of the tension elements 2 so that the latter are freely moveable in longitudinal direction.
  • the tension elements 2, 2' are provided at their outer surfaces with ribs that are disposed along a helical line and constitute an interrupted thread.
  • the center sleeve 8 has an inner thread by means of which it can be screwed onto the center steel bar 2'. In this manner the exact position of the spacer 4 upon the tension element 1 can be fixed. This thread is formeed in a manner that during tensioning of the tensioning elements 2, 2' it may be sheared or cut off if necessary.
  • wires or litz wires having a smooth outer surface are used, the free opening of the sleeve disposed at the center point can be somewhat smaller than the diameter of the bar so that the sleeve is fixed on the bar in a wedging manner.
  • the casing is constructed as a steel cover 3'.
  • a possible seam location for example a welded connection located between the free area of the sleeve tube 3 and the steel cover 3', is indicated at 3".
  • the steel cover 3 has constant wall thickness inside the concrete body. Outside of the concrete body the wall thickness and the outer diameter of the cover decreases continually until at the point 3" it decreases to the thickness of the sleeve tube 3 in the free area.
  • the steel cover 3 may be provided on its inner surface over the entire length and on its outer surface over the area embedded in concrete with adhesion increasing means. In the embodiment a rivet 10 has been subsequently placed in the steel cover 3'.
  • tension members 11 are disposed in annular fashion about the steel cover 3' which extend generally parallel to the tension member 1 and are anchored in an anchoring ring 12.
  • the anchoring ring 12 is secured in position with respect to the tension member 1 only during the mounting; in the end condition no connection exists.
  • the tensioning members 11 are passed through the bores 13 in the anchoring ring and are anchored on its outside by means of threaded nuts 14. At the opposite side the tensioning members 11 which in FIG.
  • tensioning members 11 are likewise provided in a manner known per se with hull tubes 15 and can be injected by way of channels 16.
  • a perforated disk 17 is disposed in the proximity of the anchoring end which permits only the individual elements 2, 2' to pass and otherwise. constitutes a closed chamber 18.
  • the small hollow space 18 formed by the perforated disk 17 at the end of the steel cover 3' and the end plate 21 may be injected through a special closure stub 26 with liquid concrete glue.
  • the concrete glue enters also into the hollow spaces between the tension elements 2, 2' and their hull tubes 22 and may leave at the opposite end of the anchorage through the aerating tubes 26. Flawless corrosion protection is thereby also afi'orded in this area.
  • Anchorage for a stressed tension member for heavy loads in a part of a concrete structure for example a slanted cable of a slanted cable bridge, comprising, in combination, a plurality of tension elements such as wires, litz or the like disposed parallel to one another, a common covering disposed around said elements, cement mortar or the like occupying the space of the cross-section in said covering not filled by said tension elements, said mortar or the like being introduced after tensioning of said elements, and said tension elements being fanned out in the direction of the anchorage and being individually anchored therein, said covering extending into saidconcrete structure part and comprising a metal casing in the area of entrance into said concrete structure part, said casing having a wall thickness that is constant inside said concrete structure part and decreases outside said concrete structure part, and besides being connected with said tension elements being also connected with said concrete structure part.
  • Anchorage in accordance with claim 2, where said means for adhesion are rivets provided on the wall of said metal casing.
  • Anchorage in accordance with claim 1, comprising an anchoring ring having perforations encompassing said metal casing.
  • Anchorage in accordance with claim 8 comprising tensioning members disposed around said metal casing and extending parallel thereto and through the perforations in said anchoring ring for producing prestressing in the concrete disposed around said metal casing.
  • Anchorage in accordance with claim 10 comprising an anchoring body for each tension member embedded in said concrete structure part and sleeve tubes around said tensioning members extending between said casing and said anchoring members.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
US00237951A 1971-03-27 1972-03-24 Anchoring means for tensioned member for heavy loads, for example, a slanted cable bridge Expired - Lifetime US3803785A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712114863 DE2114863C (de) 1971-03-27 Verankerung eines gespannten Zugglieds für große Belastungen in einem Betonbauteil, z.B. eines Schrägseils einer Schrägseilbrücke

Publications (1)

Publication Number Publication Date
US3803785A true US3803785A (en) 1974-04-16

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US00237951A Expired - Lifetime US3803785A (en) 1971-03-27 1972-03-24 Anchoring means for tensioned member for heavy loads, for example, a slanted cable bridge

Country Status (9)

Country Link
US (1) US3803785A (Direct)
JP (1) JPS542015B1 (Direct)
CA (1) CA984107A (Direct)
DE (1) DE2114863B1 (Direct)
DK (1) DK138706C (Direct)
FR (1) FR2131589A5 (Direct)
GB (1) GB1391485A (Direct)
IT (1) IT954530B (Direct)
SE (1) SE352391B (Direct)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192114A (en) * 1976-12-17 1980-03-11 Dyckerhoff & Widmann Aktiengesellschaft Arrangement for interconnecting bundles of prestressing tendons for prestressed concrete
US4473915A (en) * 1981-09-30 1984-10-02 Dyckerhoff & Widmann Aktiengesellschaft Tension member and a method of assembling and installing the tension member
US4484425A (en) * 1982-07-21 1984-11-27 Figg And Muller Engineers, Inc. Anchorage of cables
US4594827A (en) * 1981-09-30 1986-06-17 Dyckerhoff & Widmann Aktiengesellschaft Tension member, particularly for use as a diagonal cable in a stayed girder bridge
US4848052A (en) * 1987-03-13 1989-07-18 Dyckerhoff & Widmann Aktiengesellschaft Spacer for tension member
CN102704397A (zh) * 2012-06-28 2012-10-03 中铁十三局集团第一工程有限公司 轻型锚碇结构
US20150300452A1 (en) * 2014-04-22 2015-10-22 Richard V. Campbell Advanced Stranded Cable Termination Methods and Designs

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2811759A1 (de) * 1978-03-17 1979-09-20 Philipp Dipl Ing Schreck Vorgespanntes stahlbetonseil und verfahren zur anwendung von vorgespannten stahlbetonseilen bei der herstellung einer haengebruecke
EP0025856B1 (de) * 1979-08-13 1984-07-25 RESTRA-Patentverwertung GmbH Vorrichtung zur Endverankerung mindestens eines als Spannglied im Spannbetonbau eingesetzten Stabes aus Faser-Verbundstoff
GB8407596D0 (en) * 1984-03-23 1984-05-02 Manuf Aceros Caucho Sa Reinforcing tendon
DE3603390A1 (de) * 1986-02-05 1987-08-06 Dyckerhoff & Widmann Ag Verankerung eines ausserhalb des querschnitts eines bauwerks angeordneten gespannten zugglieds
DE3819023A1 (de) * 1988-06-03 1989-12-07 Werner Zapf Bewehrungsanordnung fuer baukonstruktionen aus spannbeton
DE59001339D1 (de) * 1989-04-12 1993-06-09 Vorspann Technik Gmbh Spannbuendel aus mehreren spanngliedern wie litzen, staeben oder draehten.
CN110593098B (zh) * 2019-10-09 2024-04-16 长江水利委员会长江科学院 一种悬索桥钟罩式锚碇结构及其施工方法
CN110939066B (zh) * 2019-12-06 2021-08-03 中铁大桥勘测设计院集团有限公司 一种锚跨丝股张拉力的确定方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US456646A (en) * 1891-07-28 Hollow bar
US940399A (en) * 1903-07-06 1909-11-16 William Mueser Concrete-steel construction.
US2618147A (en) * 1941-09-30 1952-11-18 Freyssinet Eugene Means anchoring tensioned cable for prestressed concrete
US2677957A (en) * 1952-06-12 1954-05-11 Raymond Concrete Pile Co Prestressed concrete structure
US3293811A (en) * 1965-06-01 1966-12-27 Edward K Rice Anchorage for concrete stressing tendons
CH455218A (fr) * 1966-03-31 1968-06-28 Stup Procedes Freyssinet Procédé de mise en tension et d'ancrage d'un câble et appareillage pour sa mise en oeuvre

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US456646A (en) * 1891-07-28 Hollow bar
US940399A (en) * 1903-07-06 1909-11-16 William Mueser Concrete-steel construction.
US2618147A (en) * 1941-09-30 1952-11-18 Freyssinet Eugene Means anchoring tensioned cable for prestressed concrete
US2677957A (en) * 1952-06-12 1954-05-11 Raymond Concrete Pile Co Prestressed concrete structure
US3293811A (en) * 1965-06-01 1966-12-27 Edward K Rice Anchorage for concrete stressing tendons
CH455218A (fr) * 1966-03-31 1968-06-28 Stup Procedes Freyssinet Procédé de mise en tension et d'ancrage d'un câble et appareillage pour sa mise en oeuvre

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4192114A (en) * 1976-12-17 1980-03-11 Dyckerhoff & Widmann Aktiengesellschaft Arrangement for interconnecting bundles of prestressing tendons for prestressed concrete
US4473915A (en) * 1981-09-30 1984-10-02 Dyckerhoff & Widmann Aktiengesellschaft Tension member and a method of assembling and installing the tension member
US4594827A (en) * 1981-09-30 1986-06-17 Dyckerhoff & Widmann Aktiengesellschaft Tension member, particularly for use as a diagonal cable in a stayed girder bridge
US4484425A (en) * 1982-07-21 1984-11-27 Figg And Muller Engineers, Inc. Anchorage of cables
US4848052A (en) * 1987-03-13 1989-07-18 Dyckerhoff & Widmann Aktiengesellschaft Spacer for tension member
CN102704397A (zh) * 2012-06-28 2012-10-03 中铁十三局集团第一工程有限公司 轻型锚碇结构
US20150300452A1 (en) * 2014-04-22 2015-10-22 Richard V. Campbell Advanced Stranded Cable Termination Methods and Designs
US10578191B2 (en) * 2014-04-22 2020-03-03 Bright Technologies, Llc Advanced stranded cable termination methods and designs

Also Published As

Publication number Publication date
CA984107A (en) 1976-02-24
JPS542015B1 (Direct) 1979-02-01
DK138706B (da) 1978-10-16
IT954530B (it) 1973-09-15
SE352391B (Direct) 1972-12-27
DK138706C (da) 1979-03-26
GB1391485A (en) 1975-04-23
FR2131589A5 (Direct) 1972-11-10
DE2114863B1 (de) 1972-08-03

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