GB786955A - Improvements in or relating to pre-stressed concrete members - Google Patents

Improvements in or relating to pre-stressed concrete members

Info

Publication number
GB786955A
GB786955A GB635654A GB635654A GB786955A GB 786955 A GB786955 A GB 786955A GB 635654 A GB635654 A GB 635654A GB 635654 A GB635654 A GB 635654A GB 786955 A GB786955 A GB 786955A
Authority
GB
United Kingdom
Prior art keywords
wires
pocket
concrete
stressing
post
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
Application number
GB635654A
Inventor
Thomas Boverton Redwood
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.)
Costain Concrete Co Ltd
Original Assignee
Costain Concrete Co Ltd
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 Costain Concrete Co Ltd filed Critical Costain Concrete Co Ltd
Priority to GB635654A priority Critical patent/GB786955A/en
Publication of GB786955A publication Critical patent/GB786955A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02—Stairways; Layouts thereof
    • E04F11/104—Treads
    • E04F11/16—Surfaces thereof; Protecting means for edges or corners thereof
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
    • E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
    • 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
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/02—Structures made of specified materials
    • E04H12/12—Structures made of specified materials of concrete or other stone-like material, with or without internal or external reinforcements, e.g. with metal coverings, with permanent form elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Steps, Ramps, And Handrails (AREA)

Abstract

786.955. Reinforced concrete; stairs; posts. COSTAIN CONCRETE CO., Ltd. June 6, 1955 [March 4, 1954], No. 6356/54. Classes 20(1) and 20(4) In a method of making a pre-tensioned pre-stressed concrete member 1, Fig. 1. a pocket 2 is formed in one or both ends of the member of such a size that its sidewalls encircle or embrace the ends of stressing wires 3 passing through the member 1. the wires 3 being free within the pocket or slightly embedded in the walls thereof, the wires after casting is complete being cut off so that their ends lie within the pocket which is then filled with concrete, cement grout, or bitumen. As shown the pocket 2 tapers towards its base so that the inner ends of the wires. 3 are embedded in the concrete. The wires 3 after being cut off flush with the end face 4 are folded in as at 5, Fig. 2, and bent back upon themselves at 6. In modifications three or more wires are used the cross-section of the pocket having as many sides as there are wires. Alternatively the pocket may be circular in cross-section. As .applied to the treads of a staircase, Fig. 4, a side member 8 has a series of horizontal ledges 9 each formed with a depression 10 to receive a U-shaped stirrup 11 fixed in the tread 12 during casting. Stressing wires 13 dispersed in groups of four, end in' pockets 14 and after casting, and pre-stressing the wires 13 are cut off and the ends bent over into the pockets and the latter filled in. In pre-stressing a post, such as a lamp standard of upwardly tapering lattice formation having apertures therethrough, the wires are arranged in groups along opposite sides, separate pockets being provided for each group at the bottom of the post but only a single pocket at the smaller upper end thereof. If part of the post is to be buried in the ground the apertures in this part are closed by panels.
GB635654A 1954-03-04 1954-03-04 Improvements in or relating to pre-stressed concrete members Expired GB786955A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB635654A GB786955A (en) 1954-03-04 1954-03-04 Improvements in or relating to pre-stressed concrete members

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB635654A GB786955A (en) 1954-03-04 1954-03-04 Improvements in or relating to pre-stressed concrete members

Publications (1)

Publication Number Publication Date
GB786955A true GB786955A (en) 1957-11-27

Family

ID=9813021

Family Applications (1)

Application Number Title Priority Date Filing Date
GB635654A Expired GB786955A (en) 1954-03-04 1954-03-04 Improvements in or relating to pre-stressed concrete members

Country Status (1)

Country Link
GB (1) GB786955A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217359A (en) * 1988-04-13 1989-10-25 Bison Limited Prestressed concrete staircases
CN110359649A (en) * 2018-03-26 2019-10-22 诸暨市碧涵精工模塑有限公司 A kind of large span is without support steel structure spiral stairs prestressed construction technology

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217359A (en) * 1988-04-13 1989-10-25 Bison Limited Prestressed concrete staircases
GB2217359B (en) * 1988-04-13 1991-11-27 Bison Limited Concrete staircases
CN110359649A (en) * 2018-03-26 2019-10-22 诸暨市碧涵精工模塑有限公司 A kind of large span is without support steel structure spiral stairs prestressed construction technology
CN110359649B (en) * 2018-03-26 2021-08-06 诸暨市碧涵精工模塑有限公司 Prestress construction process for large-span support-free steel structure spiral stair

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