GB700947A - Improvements in the manufacture of precast prestressed concrete units - Google Patents

Improvements in the manufacture of precast prestressed concrete units

Info

Publication number
GB700947A
GB700947A GB2034451A GB2034451A GB700947A GB 700947 A GB700947 A GB 700947A GB 2034451 A GB2034451 A GB 2034451A GB 2034451 A GB2034451 A GB 2034451A GB 700947 A GB700947 A GB 700947A
Authority
GB
United Kingdom
Prior art keywords
wires
mould
concrete
yokes
unison
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
GB2034451A
Inventor
Stephen Frederick Searchfield
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.)
John Laing and Son Ltd
Original Assignee
John Laing and Son 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 John Laing and Son Ltd filed Critical John Laing and Son Ltd
Priority to GB2034451A priority Critical patent/GB700947A/en
Publication of GB700947A publication Critical patent/GB700947A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • B28B23/022—Means for inserting reinforcing members into the mould or for supporting them in the mould
    • B28B23/024—Supporting means
    • B28B23/026—Mould partitionning elements acting as supporting means in moulds, e.g. for elongated articles

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

700,947. Reinforced concrete. LAING & SON, Ltd., J. Oct. 23, 1952 [Aug. 29, 1951], No. 20344/51. Class 20 (4) In a process for making prestressed concrete beams, the contamination with oil from the mould sides of the reinforcing wires is prevented by securing the wires between tensioning members located above and beyond the ends of the beam mould, partly tensioning the wires to prevent sagging and then lowering the tensioning members in unison to bring the wires to their correct positions within the mould. The apparatus consists of a mould box A containing a number of parallel channel-like moulds. Beyond each end of the mould box is positioned a pair of uprights F each having an arm G from which is suspended a yoke I by means of threaded rods H. The ends of reinforcing wires D are secured to the yokes and are partly tensioned by rams N which bear against uprights O so that the wires do not sag. Templates B, Fig. 4, are inserted into the mould to divide it into the required lengths and the yokes lowered in unison by rotation of the shafts H, the wires entering the mould and being guided by the vertical slots C in the templates. Plates K with transverse slots L are then placed against each template to secure the wires against vertical displacement and the wires brought to their final tension by the rams N. The moulds are then filled with concrete. After the concrete has hardened the wires D are cut, the sides of the mould are removed and the finished beams lifted out.
GB2034451A 1951-08-29 1951-08-29 Improvements in the manufacture of precast prestressed concrete units Expired GB700947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2034451A GB700947A (en) 1951-08-29 1951-08-29 Improvements in the manufacture of precast prestressed concrete units

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2034451A GB700947A (en) 1951-08-29 1951-08-29 Improvements in the manufacture of precast prestressed concrete units

Publications (1)

Publication Number Publication Date
GB700947A true GB700947A (en) 1953-12-16

Family

ID=10144399

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2034451A Expired GB700947A (en) 1951-08-29 1951-08-29 Improvements in the manufacture of precast prestressed concrete units

Country Status (1)

Country Link
GB (1) GB700947A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931065A (en) * 1956-12-28 1960-04-05 Burroughs Corp Apparatus for forming electrostatic printing heads
US3070867A (en) * 1959-12-21 1963-01-01 Theodore J Belle Strand holder and dam for prestressed concrete molds
US3092886A (en) * 1959-05-11 1963-06-11 Fmc Corp Apparatus for molding concrete t-beams
US3200177A (en) * 1963-04-04 1965-08-10 Clarence Riegel Method of forming concrete articles and slip forming machine therefor
NL1004064C2 (en) * 1996-09-18 1998-03-19 Leenstra Machine En Staalbouw Head-mould for driving pile production
SG93922A1 (en) * 2001-06-07 2003-01-21 Housing & Dev Board Improved pre-stressed concrete formation
FR2906181A1 (en) * 2006-09-25 2008-03-28 Armand Francois Santonja Reinforced concrete beam joint encasing formwork, has sheet metal plate with inverse U shape, and teeth that are formed of metal bars that are placed vertically in metal plate, where formwork has toothed comb or semi plate shape

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931065A (en) * 1956-12-28 1960-04-05 Burroughs Corp Apparatus for forming electrostatic printing heads
US3092886A (en) * 1959-05-11 1963-06-11 Fmc Corp Apparatus for molding concrete t-beams
US3070867A (en) * 1959-12-21 1963-01-01 Theodore J Belle Strand holder and dam for prestressed concrete molds
US3200177A (en) * 1963-04-04 1965-08-10 Clarence Riegel Method of forming concrete articles and slip forming machine therefor
NL1004064C2 (en) * 1996-09-18 1998-03-19 Leenstra Machine En Staalbouw Head-mould for driving pile production
SG93922A1 (en) * 2001-06-07 2003-01-21 Housing & Dev Board Improved pre-stressed concrete formation
FR2906181A1 (en) * 2006-09-25 2008-03-28 Armand Francois Santonja Reinforced concrete beam joint encasing formwork, has sheet metal plate with inverse U shape, and teeth that are formed of metal bars that are placed vertically in metal plate, where formwork has toothed comb or semi plate shape

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