US3137971A - Stressed concrete structures - Google Patents

Stressed concrete structures Download PDF

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Publication number
US3137971A
US3137971A US42136A US4213660A US3137971A US 3137971 A US3137971 A US 3137971A US 42136 A US42136 A US 42136A US 4213660 A US4213660 A US 4213660A US 3137971 A US3137971 A US 3137971A
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Prior art keywords
socket
cable
concrete
rib
concrete structures
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Expired - Lifetime
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US42136A
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Rhodes Brian
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Cable Covers Ltd
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Cable Covers Ltd
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08Members specially adapted to be used in prestressed constructions
    • E04C5/12Anchoring devices
    • E04C5/122Anchoring devices the tensile members are anchored by wedge-action

Description

June 23, 1964 RHODES 3,137,971

STRESSED CONCRETE STRUCTURES Filed July 11, 1960 United States Patent 3,137,971 STRESSEID CONCRETE STRUCTURES lirian Rhodes, Epsom, England, assignor to Cable Covers Limited, London, England, a company of the United Kingdom Filed July 11, 1960, Ser. No. 42,136 Claims priority, application Great Britain July 15, 1959 1 Claim. (Cl. 50-128) This invention relates to the post-tensioning of concrete structures by means of wire or strand, either individually or in the form of a cable and hereinafter referred to as the tensioning cable or cables. In particular this invention concerns an anchorage device for use in anchoring the cable or cables in the structure.

It is usual in the construction of post-tensioned con crete to anchor the cable by means of grips abutting against a bearing plate, which in turn bears against a thrust ring previously cast into the concrete. Furthermore helical reinforcement is usually provided behind the bearing plate to resist anchorage bursting forces. This invention is concerned with an improved form of anchorage, mainly to improve the distribution of forces into the concrete.

According to the invention an anchorage device for use in post-tensioned concrete structures comprises a socket member having an axial bore through which the tensioning cable or cables can be passed, the socket having at one end thereof a locating flange and being formed over the whole or part of its outer surface with a rib or ribs which serve to increase its effective bearing area and which, in use, ensure an even distribution of the load over the length of the socket.

In a preferred construction in accordance with the invention the socket consists of a tapered tube having a spiral rib.

The invention is diagrammatically illustrated by Way of example in the accompanying drawings in which,

FIGURE 1 is a side elevation of one form of the anchorage device according to the invention,

FIGURE 2 is a corresponding end elevation in the direction of the arrow 2 of FIGURE 1,

FIGURE 3 is a corresponding end elevation in the direction of the arrow 3 of FIGURE 1,

FIGURE 4 is a longitudinal section corresponding to FIGURE 1, and

FIGURE 5 is a longitudinal section through an alternative form of the device.

Referring to FIGURES 1 to 4 of the drawings the device, as applied for use with a plurality of single tensioning wires 1, comprises a frusto-conical metal socket member 2 having a tapered sleeve portion 3 and a locating flange 4 formed at one end of the sleeve portion 3. The outer surface of the sleeve portion is formed with a deep spiral rib 5 which extends over the whole or part thereof. The rib 5 is disposed at an angle to the central longitudinal axis of the socket and increases in depth from the end of the sleeve portion having the largest diameter to the end of the sleeve portion having the smallest diameter so that the effective outside diameter of each convolution of the rib is constant throughout the length thereof.

In use the socket member 2 is cast in the concrete indicated at 6 so that the locating flange 4 is in alignment 3,137,971 Patented June 23, 1964 with the face thereof as shown in FIGURE 1. The wires 1 are passed through the bore 7 of the socket 2 and thence individually through holes 8 drilled in a bearing plate 9 which bears on the locating flange 4. Each wire is then locked off by means of anchor grips 10 which abut the bearing plate 9. Each anchor grip 10 consists of a cylindrical barrel member 11 having a central tapered bore through which the wire is passed the wire being held therein by two or more wedges 12.

The extreme end opposite the flange 4 of the bore 7 is of untapered cross-section to receive a tubular sheath 13 for containing the wires 1 within the concrete structure.

In its alternative form as shown in FIGURE 5 the device is adapted for use with a single stranded cable 14. In this form the bearing plate 9 and the anchor grips 10 are dispensed with and the cable 14 is locked in the bore 7 by means of two or more steel wedges 15. To increase the gripping power on the cable 14 the taper of the bore 7 in this form is made more acute. This taper extends over a part only of the bore, the remainder of the bore being provided as an oppositely disposed taper 16 which opens out to receive the tubular sheath 13.

In a further modification not illustrated the wires 1 may be locked off by providing the bearing plate 9 of increased thickness and forming the holes 8 as tapered holes to receive wedges to engage the wires.

Thus it will be understood that the forces transmitted from the cable or cables are distributed through the anchorage into the concrete. These forces, according to the invention, are resisted by a combination of the bearing area of the location flange 4 and the spiral rib 5 which forms a continuous abutment and distributes the load in the concrete over the entire length of the socket. This gradual distribution of forces greatly reduces the intensity of stress in the concrete behind the anchorage, and provides a more eflicient end block condition. In addition, by forming the edge of the rib 5 parallel to the longitudinal axis of the socket member the Wedge action of the socket which would otherwise occur due to the external taper of the sleeve portion 3, is neutralized.

What I claim is:

A post-tensioned concrete structure including a stressing cable; and means for anchoring said stressing cable in a predetermined position in said structure, in which said anchoring means comprises a socket member having an external frusto-conical shape and having at its end of larger diameter a transversely disposed flange locating said socket member in said concrete structure and having a tapered axial bore extending through said socket member through which said stressing cable extends, an apertured bearing plate abutting said locating flange through which said cable extends, and at least one anchor grip gripping said cable and bearing against said bearing plate and securing said cable in position, said socket member being further provided with a continuous spiral rib which extends over at least part of the outer surface of said socket member, said rib increasing in depth from the end of said socket member of larger diameter to the end of said socket member of smaller diameter so that the effective outer diameter of each convolution of said rib is constant, the edge of the rib being parallel to the longitudinal axis of the socket member, and the inner diameters of successive convolutions progressively decrease from said large diameter end of said socket member to said smaller diameter end thereof, said rib serving to increase the effective bearing area of said socket member and ensuring an even distribution of the load over said socket member.

References Cited in the file of this patent UNITED STATES PATENTS 2,525,198 Beijl Oct. 10, 1950 A} Dyche July 15, 1952 Freyssinet Aug. 24, 1954 Finsterwalder July 24, 1956 Leonhardt Sept. 18, 1956 Dobell Feb. 19, 1957 FOREIGN PATENTS France Dec. 22, 1911 Great Britain May 29, 1957

US42136A 1959-07-15 1960-07-11 Stressed concrete structures Expired - Lifetime US3137971A (en)

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399437A (en) * 1967-04-11 1968-09-03 William F. Kelly Apparatus for post-tensioning prestressed concrete
US3412511A (en) * 1965-09-16 1968-11-26 Losinger Ag Device for tensioning and anchoring stressing members of a stressing cable
US3447784A (en) * 1965-01-04 1969-06-03 Travaux Comp Ind De Apparatus for prestressing concrete
US3475777A (en) * 1967-09-22 1969-11-04 United States Steel Corp Anchorage for suspension bridge main cable and the like
US3488903A (en) * 1968-05-20 1970-01-13 Cable Covers Ltd Positive clamping and anchoring means for elongated metal members
US3766609A (en) * 1969-03-26 1973-10-23 A Brandestini Anchoring body for key anchoring tension members
DE2530420A1 (en) * 1974-07-09 1976-01-29 Stup Procedes Freyssinet tendon
US3938902A (en) * 1974-02-26 1976-02-17 Juan Coll Morell Connecting device for wires
US3956797A (en) * 1969-03-26 1976-05-18 Antonio Brandestini Anchorage body for anchoring tendons with wedges
US4096749A (en) * 1977-04-29 1978-06-27 Stewart Robert A Core sampling device
EP0050817A2 (en) * 1980-10-23 1982-05-05 Fin Est S.P.A. Lightened anchoring heads
US4663907A (en) * 1985-06-26 1987-05-12 Manufacturas De Acero Y Caucho S.A. Anchorage for stressed reinforcing tendon
US6322290B1 (en) * 1996-01-11 2001-11-27 Jennmar Corporation Cable bolt head
US20040159058A1 (en) * 2003-02-19 2004-08-19 Jacques Gulbenkian Unbonded post-tensioning system
US20060033003A1 (en) * 2004-08-12 2006-02-16 Lomont Molding, Inc. D.B.A. Paragon Products Pocket former
US20070289239A1 (en) * 2006-06-20 2007-12-20 Davis Energy Group, Inc. Slab edge insulating form system and methods
US8919057B1 (en) * 2012-05-28 2014-12-30 Tracbeam, Llc Stay-in-place insulated concrete forming system
US9604416B2 (en) 2014-05-19 2017-03-28 Felix Sorkin Method of forming a post-tensioned concrete member utilizing a pocket former with keyway former
US9827721B2 (en) 2015-08-04 2017-11-28 Felix Sorkin Collapsible element pocket former
US9869091B2 (en) 2015-08-04 2018-01-16 Felix Sorkin Pocket cap for post-tensioned concrete member
US9896845B2 (en) 2015-08-04 2018-02-20 Felix Sorkin Spindle lock anchor for post tensioned concrete member
US9932738B2 (en) 2015-08-04 2018-04-03 Felix Sorkin Sheathing retention capsule
US10145114B2 (en) 2015-08-04 2018-12-04 Felix Sorkin Sheathing lock end cap

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR14895E (en) * 1911-02-28 1912-03-02 Raoul Diaz Wagner Bolt-nut opening for fixing rails on wooden sleepers and other applications
US2525198A (en) * 1947-02-28 1950-10-10 Beijl Zako Sytse Bolt anchor
US2603319A (en) * 1952-07-15 Ground anchor v
US2686963A (en) * 1948-04-27 1954-08-24 Freyssinet Eugene Method of anchoring reinforcements
US2755657A (en) * 1951-11-29 1956-07-24 Finsterwalder Ulrich Post-stressed reinforcing rod anchor
US2763464A (en) * 1952-07-26 1956-09-18 Leonhardt Fritz Apparatus for anchorage of concrete reinforcements
US2781658A (en) * 1951-07-31 1957-02-19 Stressteel Corp Post-stressed concrete structure
GB775744A (en) * 1955-03-15 1957-05-29 P S C Equipment Ltd A new or improved means for securing wires or rods in the stressed condition

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2603319A (en) * 1952-07-15 Ground anchor v
FR14895E (en) * 1911-02-28 1912-03-02 Raoul Diaz Wagner Bolt-nut opening for fixing rails on wooden sleepers and other applications
US2525198A (en) * 1947-02-28 1950-10-10 Beijl Zako Sytse Bolt anchor
US2686963A (en) * 1948-04-27 1954-08-24 Freyssinet Eugene Method of anchoring reinforcements
US2781658A (en) * 1951-07-31 1957-02-19 Stressteel Corp Post-stressed concrete structure
US2755657A (en) * 1951-11-29 1956-07-24 Finsterwalder Ulrich Post-stressed reinforcing rod anchor
US2763464A (en) * 1952-07-26 1956-09-18 Leonhardt Fritz Apparatus for anchorage of concrete reinforcements
GB775744A (en) * 1955-03-15 1957-05-29 P S C Equipment Ltd A new or improved means for securing wires or rods in the stressed condition

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447784A (en) * 1965-01-04 1969-06-03 Travaux Comp Ind De Apparatus for prestressing concrete
US3412511A (en) * 1965-09-16 1968-11-26 Losinger Ag Device for tensioning and anchoring stressing members of a stressing cable
US3399437A (en) * 1967-04-11 1968-09-03 William F. Kelly Apparatus for post-tensioning prestressed concrete
US3475777A (en) * 1967-09-22 1969-11-04 United States Steel Corp Anchorage for suspension bridge main cable and the like
US3488903A (en) * 1968-05-20 1970-01-13 Cable Covers Ltd Positive clamping and anchoring means for elongated metal members
US3766609A (en) * 1969-03-26 1973-10-23 A Brandestini Anchoring body for key anchoring tension members
US3956797A (en) * 1969-03-26 1976-05-18 Antonio Brandestini Anchorage body for anchoring tendons with wedges
US3938902A (en) * 1974-02-26 1976-02-17 Juan Coll Morell Connecting device for wires
DE2530420A1 (en) * 1974-07-09 1976-01-29 Stup Procedes Freyssinet tendon
US4096749A (en) * 1977-04-29 1978-06-27 Stewart Robert A Core sampling device
EP0050817A2 (en) * 1980-10-23 1982-05-05 Fin Est S.P.A. Lightened anchoring heads
EP0050817A3 (en) * 1980-10-23 1982-07-14 Fin Est S.P.A. Lightened anchoring heads
US4663907A (en) * 1985-06-26 1987-05-12 Manufacturas De Acero Y Caucho S.A. Anchorage for stressed reinforcing tendon
US6322290B1 (en) * 1996-01-11 2001-11-27 Jennmar Corporation Cable bolt head
US20040159058A1 (en) * 2003-02-19 2004-08-19 Jacques Gulbenkian Unbonded post-tensioning system
US20060033003A1 (en) * 2004-08-12 2006-02-16 Lomont Molding, Inc. D.B.A. Paragon Products Pocket former
US7216842B2 (en) * 2004-08-12 2007-05-15 Lomont Molding, Inc. Pocket former
US7596915B2 (en) * 2006-06-20 2009-10-06 Davis Energy Group, Inc. Slab edge insulating form system and methods
US20070289239A1 (en) * 2006-06-20 2007-12-20 Davis Energy Group, Inc. Slab edge insulating form system and methods
US8919057B1 (en) * 2012-05-28 2014-12-30 Tracbeam, Llc Stay-in-place insulated concrete forming system
US10094112B1 (en) 2012-05-28 2018-10-09 Dennis J. Dupray Stay-in-place insulated concrete forming system
US9611645B1 (en) 2012-05-28 2017-04-04 Dennis J. Dupray Stay-in-place insulated concrete forming system
US10815663B1 (en) 2012-05-28 2020-10-27 Dennis J. Dupray Stay-in-place insulated concrete forming system
US9604416B2 (en) 2014-05-19 2017-03-28 Felix Sorkin Method of forming a post-tensioned concrete member utilizing a pocket former with keyway former
US20170152660A1 (en) * 2014-05-19 2017-06-01 Felix Sorkin Modified Pocket Former
US10072429B2 (en) * 2014-05-19 2018-09-11 Felix Sorkin Modified pocket former
US9869091B2 (en) 2015-08-04 2018-01-16 Felix Sorkin Pocket cap for post-tensioned concrete member
US9896845B2 (en) 2015-08-04 2018-02-20 Felix Sorkin Spindle lock anchor for post tensioned concrete member
US9932738B2 (en) 2015-08-04 2018-04-03 Felix Sorkin Sheathing retention capsule
US9827721B2 (en) 2015-08-04 2017-11-28 Felix Sorkin Collapsible element pocket former
US10145114B2 (en) 2015-08-04 2018-12-04 Felix Sorkin Sheathing lock end cap
US20190024187A1 (en) * 2015-08-04 2019-01-24 Felix Sorkin Collapsible element pocket former
US10343354B2 (en) * 2015-08-04 2019-07-09 Felix Sorkin Collapsible element pocket former
US10500799B2 (en) * 2015-08-04 2019-12-10 Felix Sorkin Collapsible element pocket former
US10071530B2 (en) * 2015-08-04 2018-09-11 Felix Sorkin Collapsible element pocket former

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