EP1362680A2 - Spannbetonfertigteile und Verfahren zur Herstellung - Google Patents

Spannbetonfertigteile und Verfahren zur Herstellung Download PDF

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Publication number
EP1362680A2
EP1362680A2 EP03252950A EP03252950A EP1362680A2 EP 1362680 A2 EP1362680 A2 EP 1362680A2 EP 03252950 A EP03252950 A EP 03252950A EP 03252950 A EP03252950 A EP 03252950A EP 1362680 A2 EP1362680 A2 EP 1362680A2
Authority
EP
European Patent Office
Prior art keywords
concrete
mould
hopper
unit
prestressed
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.)
Withdrawn
Application number
EP03252950A
Other languages
English (en)
French (fr)
Other versions
EP1362680A3 (de
Inventor
Mark Hamilton Jardine
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.)
Poundfield Products Ltd
Original Assignee
Poundfield Products 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 Poundfield Products Ltd filed Critical Poundfield Products Ltd
Publication of EP1362680A2 publication Critical patent/EP1362680A2/de
Publication of EP1362680A3 publication Critical patent/EP1362680A3/de
Withdrawn legal-status Critical Current

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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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0091—Transformable moulds allowing the change of shape of an initial moulded preform by preform deformation or the change of its size by moulding on the preform
    • 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
    • B28B23/04—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 the elements being stressed

Definitions

  • This invention relates to prestressed concrete units, to a method of manufacture of prestressed concrete units and to a mould system for use in such a method.
  • Concrete units for walling are conventionally produced in an 'L' shape so that they may be self-supporting, although other shapes are also known. Units are generally manufactured by pouring concrete into a mould which contains reinforcing bars. The concrete is usually vibrated to force any trapped air to rise to the surface of the mould.
  • the open portion of the mould into which concrete is poured generally forms a side of the resulting unit.
  • Prestressed units overcome some of the aforementioned disadvantages, but prestressed units are only available in generally longitudinal shapes such as panels, tubes and the like, so prestressed units suitable for use as self supporting walling have been previously unavailable.
  • a method of manufacturing a prestressed concrete unit using a mould system comprising an elongate mould containing at least one prestressed element and an elongate hopper having an aperture, comprising the steps of locating at least one reinforcing element in a substantially perpendicular orientation to said mould; filling the elongate mould with concrete to form a first portion of the unit; locating the hopper over said reinforcing element in a substantially perpendicular orientation with the mould; and filling the hopper with concrete such that the concrete flows through the aperture to contact the concrete of the first portion.
  • the method may further comprise steps of vibrating the concrete of the first portion; and vibrating the concrete of the second portion.
  • An improved method includes the steps of inserting a gate between the hopper and concrete in the mould prior to vibrating the concrete of the second portion; and removing said gate after vibrating the concrete of the second portion.
  • the concrete of the first portion may be vibrated prior to filling the hopper with concrete.
  • a prestressed concrete unit comprising an elongate prestressed first portion; and an elongate reinforced second portion which is substantially perpendicular to the first portion.
  • the first portion forms a substantially vertical wall and the second portion forms a substantially horizontal foot at the bottom of the wall to form an 'L' shaped unit.
  • a side of the first portion is formed to co-operate with a side of a second concrete unit.
  • a side of the first portion may have a tongue to co-operate with a groove of another unit, and another side of the first portion may have a groove to co-operate with a tongue of another unit.
  • a mould system for use in the manufacture of prestressed concrete units comprising an elongate mould with two sides having means for locating at least one prestressed element therein; an elongate hopper; means for locating at least one reinforcing element in a substantially perpendicular orientation to said mould; and means for locating the hopper in a substantially perpendicular orientation with respect to the mould over said reinforcing element.
  • a side of the mould has a tongue and another side has a groove such that a unit formed in the mould system has a tongue on one side to co-operate with a groove of another unit, and a groove on the other side to co-operate with a tongue of another unit.
  • the mould system further comprises a gate for insertion adjacent the hopper for retention of concrete in the hopper during vibration thereof.
  • FIG. 1a a conventional bed 1 for the manufacture of prestressed concrete panels is shown.
  • the bed 1 comprises a number of elongate mould sections 2 separated from each other by partitions 3.
  • Two sidewalls 4 together with two partitions 3 form a mould for production of a panel.
  • Wires 5, which comprise 9.3mm strand, for example, are stretched along the length of the bed 1 and secured at each end 6 of the bed.
  • the wires 5 are stretched, for example, they may be stretched to 80% breaking point.
  • Concrete is poured into one or more mould sections 2 to form a required number of panels.
  • the concrete in each mould section 2 is vibrated, for example using a conventional poker vibrator, so that any trapped air rises to the surface of the mould.
  • the concrete is then allowed to set before the wires 5 are cut, and the resulting panels lifted from the mould.
  • the partitions 3 are relocatable so that panels of differing lengths may be manufactured by simply moving one or more partitions 3 to a different location, so different customer requirements can be met without the requirement for different moulds for different size panels.
  • FIG. 1b shows a vertical cross section of the bed 1. It can bee seen that each partition 3 comprises two dividing plates 7, 7', with a space 8 therebetween so that the wires 5 may be cut once the concrete has set. The wires 5 pass through apertures 9 in the partitions, the apertures being small enough so that a substantial amount of concrete does not leak through before the concrete has set.
  • FIG. 2a and 2b illustrate a hopper 10 which forms part of the mould system of the present invention.
  • the hopper 10 has a rear wall 11 and a front wall 12.
  • the lower part of the rear wall 11 extends so that when in use the lower part of the rear wall 11 replaces the dividing plate 7'.
  • Fins 13 extend from the rear wall to support the wall.
  • the front wall 12 and the rear wall 11 are detachable from one another and are secured to each other in operation, using bolts 14.
  • the hopper 10 has an aperture 16 at the top and an aperture 17 at the bottom.
  • Figure 3a illustrates the bed 1 together with the rear wall 11 of the hopper 10 which has been located next to dividing plate 7 such that the lower part of the rear wall 11 replaces the dividing plate 7'.
  • a reinforcing cage for example, fabricated from high tensile 8mm steel bars, is placed by the rear wall 11 so that it will be located in the interior of the hopper 10 when the front wall 12 is secured to the rear wall 11.
  • the bars of the reinforcing cage may be secured to the prestressed wires 5, or may simply be secured once the concrete hardens around the cage 18 and the wires 5 in the vicinity of the cage 18.
  • the front wall 12 of the hopper 10 is then lowered into place adjacent the rear wall 11, and over the reinforcing cage 18, and the two parts are secured together using bolts 14.
  • the hopper 10 is then filled with concrete through the top aperture 16, the concrete flows through the bottom aperture 17 of the hopper 10 and mixes with the concrete in the mould 2.
  • the concrete in the hopper is then vibrated, to release any trapped air in the concrete which has been poured into the hopper.
  • the concrete in the hopper forms a second portion of the concrete unit.
  • the concrete in the mould and the concrete in the hopper may be vibrated in the sequence described above, or concrete forming each part may be vibrated in any sequence once both parts of the mould system have been filled.
  • Figure 3c illustrates an improved version of the mould system described above, which also includes a removable gate 19 which serves to retain concrete in the hopper 10 whilst concrete in the hopper is vibrated.
  • the gate 19, has means, for example slots, to avoid the prestressed wires 5.
  • the gate 19, may be fabricated from 5cm thick foamex board for example.
  • FIGs 4a and 4b illustrate cross sections of a reinforced concrete unit produced according to the method described above.
  • a wall portion 20 formed in the mould section 2 and the foot portion 22 is formed in the hopper 10.
  • the wall portion is approximately 2.4m high (indicated by H) and the foot portion is approximately 1 m long (indicated at L).
  • Each portion is about 10cm thick (indicated by T), although at the thickness increases to about 15cm (indicated by T3), and at the join the thickness is about 30cm (indicated by T2).
  • the wall portion 20 has a tongue portion 23 and a groove portion 24, which are designed to co-operate with corresponding tongue and groove portions of another concrete unit, so that a wall may be created in which units are aligned with one another using corresponding tongues and grooves.
  • the tongue and the groove measure approximately 30mm and are located centrally in the wall.

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  • 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)
EP03252950A 2002-05-17 2003-05-12 Spannbetonfertigteile und Verfahren zur Herstellung Withdrawn EP1362680A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0211356 2002-05-17
GB0211356A GB2388569B (en) 2002-05-17 2002-05-17 Prestressed concrete units and method of manufacture

Publications (2)

Publication Number Publication Date
EP1362680A2 true EP1362680A2 (de) 2003-11-19
EP1362680A3 EP1362680A3 (de) 2005-04-27

Family

ID=9936884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03252950A Withdrawn EP1362680A3 (de) 2002-05-17 2003-05-12 Spannbetonfertigteile und Verfahren zur Herstellung

Country Status (2)

Country Link
EP (1) EP1362680A3 (de)
GB (1) GB2388569B (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921354A (en) * 1956-03-12 1960-01-19 William O W Pankey Apparatus for making precast concrete bridges or the like
US4953280A (en) * 1987-06-03 1990-09-04 Gifford-Hill & Company, Inc. Method of manufacturing prestressed concrete culverts

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926541A (en) * 1970-06-29 1975-12-16 Frederick M Hewitt Extruder with interacting auger and care means
FR2699951B1 (fr) * 1992-12-29 1995-03-03 Saret France Sa Procédé de fabrication de poutres en béton précontraint et poutres obtenues par ce procédé.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921354A (en) * 1956-03-12 1960-01-19 William O W Pankey Apparatus for making precast concrete bridges or the like
US4953280A (en) * 1987-06-03 1990-09-04 Gifford-Hill & Company, Inc. Method of manufacturing prestressed concrete culverts

Also Published As

Publication number Publication date
GB2388569A (en) 2003-11-19
GB0211356D0 (en) 2002-06-26
GB2388569B (en) 2006-12-20
EP1362680A3 (de) 2005-04-27

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