US3657798A - Method of winding wire about prestressed containers - Google Patents

Method of winding wire about prestressed containers Download PDF

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Publication number
US3657798A
US3657798A US880689A US3657798DA US3657798A US 3657798 A US3657798 A US 3657798A US 880689 A US880689 A US 880689A US 3657798D A US3657798D A US 3657798DA US 3657798 A US3657798 A US 3657798A
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US
United States
Prior art keywords
wire
winding
anchorage
button
unit
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 - Lifetime
Application number
US880689A
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English (en)
Inventor
Antonio Brandestini
Walter Thorpe
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Simon Carves Ltd
Carves Simon Ltd
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Carves Simon Ltd
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Publication date
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Publication of US3657798A publication Critical patent/US3657798A/en
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    • 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
    • E04C5/125—Anchoring devices the tensile members are profiled to ensure the anchorage, e.g. when provided with screw-thread, bulges, corrugations
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H7/00—Construction or assembling of bulk storage containers employing civil engineering techniques in situ or off the site
    • E04H7/02—Containers for fluids or gases; Supports therefor
    • E04H7/18—Containers for fluids or gases; Supports therefor mainly of concrete, e.g. reinforced concrete, or other stone-like material
    • E04H7/20—Prestressed constructions
    • 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
    • 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 wire is tensioned because the rate of travel of the winding unit around the container is greater than the rate of pay-off of wire from the unit and the degree of tension is a function of the differential between these rates.
  • the anchorage at the initial end is preferably capable of withstanding the high forces acting thereon when the maximum wire tension is being induced by the winding unit and there should be no risk of slippage or other faults which tend to relieve the tension of the winding. If the anchorage at the initial end does not meet this requirement full tension cannot be applied immediately, and some wire would then need to be wound at less than the full working stress. Similarly, the terminal anchorage should be able to withstand the forces acting on it as a result of the tension in the winding and it must be possible to secure the end of the wire to the terminal anchorage without relieving the tension in the winding. The difficulty of providing suitable anchorages is increased by the requirement that the anchorages should not extend into the zone occupied by the winding and must therefore be of minimum dimensions.
  • a method of anchoring an end of a tensioned wire wrapped by a winding unit including the step of upsetting the portions of the wire destined to become the initial and/or terminal ends of the wire constituting a winding to form an attachment button or buttons adapted to transmit tension to an anchorage or anchorages in which the end or ends of the wire can be received.
  • a method in accordance with the invention may comprise the steps of stopping the winding unit during a wrapping operation so that it maintains tension in the wire paid out to the rear of the unit while an untensioned length of wire extends forwardly of the unit, upsetting the free end of said length of wire and a portion spaced from said end to form spaced terminal and intermediate attachment buttons respectively, applying a force to said free end to tension said length of wire by an amount sufficient to equalize the tension in the wire to the front and rear of the winding unit, and anchoring said intermediate button by lateral displacement onto an anchorage in a recessed portion of a side of the groove and subsequently releasing the force applied to the free end of the wire.
  • a method in accordance with the invention may comprise the steps of stopping the winding unit during a winding operation so that it maintains the tension in the wire paid out to the rear of the unit, upsetting a portion of the tensioned wire to the rear of the unit to form an attachment button, anchoring said button by lateral displacement onto an anchorage in a recessed portion of a side of the groove and subsequently releasing the wire from the winding unit so as to transfer the force exerted by the tensioned winding from said unit to said anchorage.
  • FIG. 1 is a diagrammatic side view of a tensioning wire upon which has been fonned an intermediate button and a terminal button used in carrying out a method of tensioning according to one aspect of the present invention.
  • FIGS. 2a, 2b, and 2c are views illustrating three stages in a method of anchoring according to the present invention employing the tensioning wire of FIG. 1.
  • FIGS. 30 and 3b are views indicating two stages in a method of anchoring according to the present invention employing a tensioning wire upon which an intermediate button only has been formed.
  • FIG. 4 is a perspective view of an anchored wire tensioning by the method illustrated either in FIGS. Za-Zc or in FIGS. 3a and 3b.
  • FIG. 5 is a perspective view on a larger scale of an anchorage shown in FIG. 4, but shown with an anchorage block adapted to retain in tension a plurality of tensioning wires.
  • FIG. 6 is a sectional view of a further mode of fixing a tensioning wire to an anchorage block in a method of anchoring according to the present invention.
  • FIG. 7 is a sectional view of another mode of fixing a tensioning wire to an anchorage block in a method of anchoring according to the present invention.
  • Both of the above embodiments are concerned with the task of anchoring the ends of tensional wire wrapped by a winding unit within grooves formed in the outer surface of a concrete pressure vessel.
  • a detailed knowledge of the construction of the winding unit and associated equipment for laying the wire winding around the container is not necessary to an understanding of the invention and it suffices to say that the winding unit is arranged to be displaceable in the groove and travel around the container while paying out wire at a rate less than the rate of travel of the unit so as to tension the wire by an amount which is adjustable by varying the differential between said rates.
  • the winding unit indicated by the reference numeral I is stopped after laying down one winding but still maintains the wire 2 in the tensioned state.
  • a length 2 (see FIG. 2a) of untensioned wire extends from the front of the unit 1 and it is on the free end of this length and at a location to the rear of this end that up setting operations are performed resulting in the formation of a terminal attachment 3 and an intermediate attachment button 4 spaced therefrom. (See particularly FIG. 1).
  • a subsidiary tensioning unit 5 (see FIG.
  • FIG. 2b indicates the conditions where the tensions are equalized.
  • the intermediate attachment button 4 is now displaced laterally with respect to groove 6 in which the wire has been wound and the wire to its rear is fitted into one of a number of slots in a terminal anchorage block 7 located in a recess 8, the dimensions of the block 7 and recess 8 being such that the block 7 does not extend into the zone occupied by the winding.
  • a washer 9 which has been threaded onto the wire before upsetting bears against packing shims 10 (only one shown) which bear against the block 7 and fill any gap which would otherwise exist between the washer 9 and block 7. (See FIG. 5).
  • packing shims 10 only one shown
  • a threaded adjuster sleeve 11 likewise threaded onto the wire before upsetting, can be provided around the wire 2 which, by engaging with a suitable thread in the terminal anchorage block 7, can ensure that the load in the wire 2 is transmitted to the anchorage block 7 without transfer loss.
  • the subsidiary tensioning unit 5 attached to the terminal button 3 is now slowly released to transfer the load in the winding to the anchorage block 7.
  • the winding unit 1 is again stopped after laying down a winding and holds the wire 2 to maintain the tension in the wire 2.
  • a single attachment button 4 is formed at a chosen site on the tensioned wire 2 to the rear of the unit 1.
  • This button 4 which may also be referred to as an intermediate attachment button, is then displaced laterally onto an anchorage block 7 using packing shims 10 or an adjuster sleeve as described above to take up any clearance between the button 4 and the blocl 7 in' the same manner as described above in the description of the first embodiment.
  • any washers or adjuster sleeves must be positioned on the wire before winding.
  • the winding unit can now be slowly released from the wire so that the tensional forces are transferred from the winding unit 1 onto the anchorage block 7.
  • the upsetting operation in both embodiments can be performed by known machines one of which, for example, comprises hydraulically operated clamping jaws and upsetting hammers and which can be readily adapted to form end buttons or intermediate buttons. It may, however, be necessary to modify the machine so that the button forming portion situated immediately adjacent to the operating head of the winding unit is of the minimum size.
  • the wire constituting the winding may be of any suitable length and gauge and is anchored at both ends in the embodiments under discussion by means of attachment buttons formed on the wire by an upsetting operation.
  • Anchorage blocks fixedly located in recesses of the type described above, may be provided on one or both sides of the groove accomodating the winding.
  • each anchorage block is, as mentioned above, provided with a plurality of slots. These slots are spaced at various levels from the floor of the groove in which the end portions of wire adjacent the attachment buttons are received to allow the tensional force in the wire of each winding to be transmitted to the block through the button.
  • the securement of the initial end of the wire is the same for both embodiments.
  • An upsetting operation forms an attachment button on this end and the adjacent portion of wire is slipped into one of the slots in the initial anchorage block. Displacement of the winding unit tensions the wire and the attachment button is pulled against the anchorage block and transfers the tensional forces thereto.
  • the collar may have the form of an annular wedge 12, as shown in FIG. 7.
  • wire has been used herein when referring to the wrapped tensioning material, it is to be understood that single or multi-strand wire or cable or any other suitable filamentary material which is capable of being upset to form, an attachment button may be employed and references to wire" in the specification and claims are to be construed accordingly.
  • a method of winding a wire under tension around a container using a winding unit comprising the steps of anchoring the initial end of said wire at a-winding zone on the container having a laterally open recess at one side containing a stationary anchorage, winding the wire a plurality of times around the container within said winding zone in such manner that the rate of travel of the winding unit is greater than the rate of pay-off of the wire from said unit whereby the wire is tensioned during winding, upsetting a portion of said wire forming the terminal end to form an attachment button, displacing said buttonlaterally of said winding zone about a fixed surface on said container and onto a fixed anchorage while maintaining the wire under winding tension, and then releasing the wire from tensioning by said winding unit and transferrinf said tension to said anchorage.
  • a method as claimed lll claim 1 comprising the steps of stopping the winding unit during a winding operation so that it maintains tension in the wire paid out to the rear of the unit while an untensioned length of wire having a free end extends forwardly of the unit, upsetting the free end of said untensioned length of wire and a portion spaced from said end to form spaced terminal and intermediate attachment buttons respectively, applying a force to said free end to tension said length of wire by an amount sufficient to equalize the tension in the wire to the front and rear of the winding unit, anchoring said intermediate button by lateral displacement onto said anchorage, and subsequently releasing the force applied to the free end of the wire.
  • a method as claimed in claim 1 comprising the steps of stopping the winding unit during a winding operation so that it maintains tension in the wire paid out to the rear of the unit, upsetting a portion of the tensioned wire to the rear of the unit to form an attachment button, anchoring said button by lateral displacement onto said anchorage, and subsequently releasing the wire from the winding unit.
  • said winding zone is an annular groove in the outer surface of the container and said recess is formed in a side wall of said groove.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Package Frames And Binding Bands (AREA)
US880689A 1968-12-05 1969-11-28 Method of winding wire about prestressed containers Expired - Lifetime US3657798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB57876/68A GB1268055A (en) 1968-12-05 1968-12-05 Improvements in or relating to methods of winding tensioning wires around containers to be pre-stressed

Publications (1)

Publication Number Publication Date
US3657798A true US3657798A (en) 1972-04-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US880689A Expired - Lifetime US3657798A (en) 1968-12-05 1969-11-28 Method of winding wire about prestressed containers

Country Status (7)

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US (1) US3657798A (fr)
CH (1) CH518436A (fr)
DE (1) DE1961904A1 (fr)
FR (1) FR2025461A1 (fr)
GB (1) GB1268055A (fr)
NL (1) NL6918346A (fr)
SE (1) SE357792B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090108117A1 (en) * 2007-10-25 2009-04-30 Takata Corporation Seat belt retractor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19812376A1 (de) * 1998-03-20 1999-09-23 Norbert Stoffer Armatur für Preßluftflaschen
US6512918B1 (en) 1999-08-19 2003-01-28 Telefonaktiebolaget Lm Ericsson (Publ) Methods and arrangements for transcoder selection and transcoding data within packet-switched communication networks supporting radio interfaces

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804674A (en) * 1952-06-16 1957-09-03 Long Construction Company Double head reinforcing rod for pre-stress concrete
US3225499A (en) * 1962-07-02 1965-12-28 Jack P Kourkene Post tensioning concrete reinforcing wires
US3263384A (en) * 1960-01-21 1966-08-02 Prescon Corp Apparatus for post-tensioning concrete prestressing members
US3327380A (en) * 1964-06-08 1967-06-27 Howlett Machine Works Prestressing method
US3427772A (en) * 1966-09-06 1969-02-18 George W Williams Apparatus for post-tensioning and interconnecting re-enforcing wires using key hole anchor plates in a concrete structure
US3552940A (en) * 1967-03-07 1971-01-05 Taylor Woodrow Const Ltd Circumferential stressing of concrete pressure vessels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804674A (en) * 1952-06-16 1957-09-03 Long Construction Company Double head reinforcing rod for pre-stress concrete
US3263384A (en) * 1960-01-21 1966-08-02 Prescon Corp Apparatus for post-tensioning concrete prestressing members
US3225499A (en) * 1962-07-02 1965-12-28 Jack P Kourkene Post tensioning concrete reinforcing wires
US3327380A (en) * 1964-06-08 1967-06-27 Howlett Machine Works Prestressing method
US3427772A (en) * 1966-09-06 1969-02-18 George W Williams Apparatus for post-tensioning and interconnecting re-enforcing wires using key hole anchor plates in a concrete structure
US3552940A (en) * 1967-03-07 1971-01-05 Taylor Woodrow Const Ltd Circumferential stressing of concrete pressure vessels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090108117A1 (en) * 2007-10-25 2009-04-30 Takata Corporation Seat belt retractor

Also Published As

Publication number Publication date
SE357792B (fr) 1973-07-09
NL6918346A (fr) 1970-06-09
CH518436A (fr) 1972-01-31
FR2025461A1 (fr) 1970-09-11
DE1961904A1 (de) 1970-07-16
GB1268055A (en) 1972-03-22

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