US2394228A - Apparatus and method for the production of prestressed concrete sleepers - Google Patents

Apparatus and method for the production of prestressed concrete sleepers Download PDF

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Publication number
US2394228A
US2394228A US532624A US53262444A US2394228A US 2394228 A US2394228 A US 2394228A US 532624 A US532624 A US 532624A US 53262444 A US53262444 A US 53262444A US 2394228 A US2394228 A US 2394228A
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United States
Prior art keywords
moulds
mould
concrete
production
wires
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Expired - Lifetime
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US532624A
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English (en)
Inventor
Barber Ronald Samuel Vernon
Lester Dudley Roger
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DOWSETT ENGINEERING CONSTRUCTI
DOWSETT ENGINEERING CONSTRUCTION Ltd
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DOWSETT ENGINEERING CONSTRUCTI
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    • 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

  • the first is that the reinforcing wires under high tension extend along the production lines and pass through the end plates of the sleeper moulds arranged in series: the second is that when a mould has been filled with concrete there is a short period (e. g. to 150 minutes) during which the concrete sets" or loses its mobile quality and then along period (somewhat indefinite but generally a matter of days) during which the concrete hardens and can be handled and transported.
  • the resulting problems or requirements include (a) the supply of clean and empty moulds (open-ended troughs) to the production lines containing the stretched wires,
  • the sleeper bed is about 500 to 600 feet long and has a number of parallel production lines each accommodating long series of moulds, say 2 pairs side by side.
  • the supply of clean and empty moulds to the production lines and the removal of moulds containing hardened concrete sleepers or the moulds and the sleepers separately are effected by means of transverse conveyors or run-ways.
  • Gravity conveyors or run-ways may be used for the supp y of empty'moulds.
  • the removal of the full moulds to the dismantling bay or the removal of finished sleepers is preferably effected by power-driven conveyors.
  • This invention further includes an arrangement in which the supply of empty moulds, the assembling of the moulds and end plates in v proper relation to the reinforcing wires, the filling of the moulds with concrete and the vibration of the moulds as well as the severing of individual moulds from their series at completion and the removal of the severed moulds to the tling bay all take place in the middle portion of the production lines.
  • This invention further includes a duplex arrangement for the mass production of prestressed concrete sleepers of the kind above referred to in which twotransverse conveyors for empty moulds are used, one on each side of a central filling station.
  • the moulds e. g. a pair of moulds, having been brought into a production line and assembled on the stretched wires are filled with concrete and vibrated at the filling station and then moved along the stretched wires to their setting and hardening positions on one side of the filling station (1. e. towards one end of the production line).
  • a transverse gate or partition which may be provided with means for gripping the stretched wires.
  • the other supply conveyor is brought into play and the operation of assembly, filling, vibrating and moving another series is carried out for the other side of the central filling station, i. e. towards the other end of the production line.
  • the removal of completed moulds may likewise be carried out in duplex fashion, the moulds between the mid-' position and one end being first brought up in succession to the severing point and to the transverse removal conveyor after which the moulds between the mid-position and the other end of the line are brought up in succession to the severing point and to the transverse removal conveyor.
  • the production lines are nearly on ground level i. e. the filled moulds run to their setting and hardening positions on roller run-ways at bench height so that the operations of filling and vibrating the moulds as well as the operations of cutting the wires at the ends of a mould on completion, all take place at bench height.
  • the reinforcing wires supplied from reels at one end of the production lines pass through lack heads or pedestals arranged at each end of the production lines and the stretching and securing of the wires is carried out in known manner, the wires being of course above the run-ways of the production lines.
  • the transverse gravity conveyors for supply of clean empty moulds pass (from a mould-cleaning bay) under the main run-ways of the production lines.
  • the empty mould in pairs side by side travel along these transverse conveyors with their axes at right angles to the production lines, so when a pair of moulds reaches its own line it engages a little hoist like a compressed air or pneumatic hoist which turns the moulds through 90 about a vertical axis and raises them to the run-way level where an operator places the empty mould in proper relation to the stretched wires and also assembles the slotted end plates so as to fit the various wires and close the ends of the mould.
  • the mould when assembled is moved to the filling station where it is brought on to a vibratory platform; and. while vibration is proceeding the concrete from a tramverse travelling hopper is fed into the mould which is then passed along the run-way (and along the wires) until it reaches its setting position.
  • a power-driven winch or Windlass having wire cables adapted to engage with a mould in the series and pull the series along the run-way.
  • the mould to besevered is thus pulled up to the severing point and the wires are burnt off.
  • the cable is then coupled to the next mould of the series which is moved forward by one stage.
  • One eifect is to push the severed mould (or pair of moulds) into line with the transverse conveyor for removing the severed moulds and these moulds are brought above a pneumatic lift (with roller top) so that the moulds can be lowered on to the removal conveyor.
  • the dismantling of the moulds and their cleaning do not form part of this invention.
  • the filling and removal of moulds is carried out at the middle portion of the production lines but it will be understood that the transverse conveyors or run-ways may also be used in cases where the assembly bay and/or the dismantling bay i at or near an end of the production lines.
  • the stretched wires may be resorted to with advantage in cases where the assembly bay and/or the dismantling bay is at or near an end of the production lines.
  • Figure 1 is a plan of the production lines, transverse mould conveyors and other parts,
  • Figure 2 is an elevation of the same
  • Figure 3 is a perspective view of part of an assembled mould
  • Figure 4 is a perspective view of a transverse gate or partition for gripping stretched wires at an intermediate point in the production line.
  • an assembly platform [2 is adapted to receive a mould l3 and to be brought into contact with a vibrator platform 14 which imparts vibration to the mould l3; and concrete grout is supplied to the mould through a filling device 15.
  • each production line has a track It with a succession of rollers i'l arranged at spaced intervals transversely to the track.
  • Each production line has a series of parallel reinforcing wires 18 stretched right along the production line and so arranged as to be accommodated within all the moulds in that line so that the reinforcing wires will be embedded in the concrete in each mould.
  • the reinforcing wires are placed in a state of very high tension, but the means for supporting the wires and for applying the high tension are not shown as they form no part of this invention.
  • each assembled mould l3 shall be filled with concrete at the assembly platform [2 and then pass along the production line (and along the reinforcing wires) to its position in the production line to allow the concrete to set and harden.
  • the particular feature of this invention lies in the means for introducing the empty moulds to the production lines and for removing the moulds from the productionlines after the concrete has set and hardened and after the reinforcing wires have been severed therefrom.
  • the transverse track for introducing the empty moulds is shown at IS; a turn-table for turning the empt moulds from alignment with the track l9 into alignment with the production line I6 is indicated at 20 and an elevator for raising the moulds up to the level of the production line is shown at 2
  • the mould is a hollow trough 22 open at its ends and arranged to embrace the reinforcing wires l8.
  • Eiach end of the mould is provided with slotted end plates 23 which form the subject of a separate patent application.
  • the mould 22 is provided with bars or runners 24 which engage with the rollers ll so that each mould is capable of running freely on the collars l'l along the track it.
  • a winch 2B is shown in Figures 1 and 2 and this winch may be used to move the filled mould from the platform l2 to the setting position for that mould. It will be readily appreciated from Figures 1 and 2 that the empty moulds for each production line are brought to that line over the track l9, that the moulds thus introduced (generally in pairs) are turned (on turn-table parallel with the production line and are then raised to the level of the production line by the elevator 2
  • the moulds are pulled along the tracks It on to the platform l2 in turn where they are fitted with the end plates and thereby fully assembled. Concrete grout is filled into the assembled mould which is vibrated and after completion of the operations of filling and vibrating, the filled mould is pulled away from the platform I2 along the production line to its setting position. After the concrete in the moulds has set and hardened, the moulds may be moved along the production lines and at that stage the reinforcing wires themselves form the haulage means or couplings between moulds in series. Here again the winch is utilized so that the moulds in turn may be pulled into position for the severing of the reinforcing wires and for the removal of the moulds from the production line.
  • a transverse discharge conveyor 26 is arranged under the tracks 5.
  • a power driven conveyor 26 is diagrammaticall shown and in this case the finished moulds are brought on to a vertically movable platform 21 and lowered by the elevator 28 into a position where they can be transferred to the power driven conveyor 26. It will be understood that the finished moulds can be brought to the platform 21 from either end of the production line.
  • the concrete filling device IS the vibratory platform It and the elevators 2
  • a device is shown in the nature of a transverse gate or partition which can be used to shut off one side of a production line when it has been fully supplied with filled moulds so that no vibration shall be transmitted to the filled moulds while further moulds are being filled and vibrated on these same reinforcing wires.
  • the device consists of a trough-shaped box having slotted end plates 36 constructed and operated like the end plates 23 of the moulds.
  • the box is conveni ntly filled with sand and the sand is covered by a lid 3'! which can be screweddown by a threaded spindle 38 engaging a transverse bar 39 across the top of the box 35.
  • the bottom of the box has clamps 40 which can be firmly secured to the track iii.
  • a method for the production of pre-stressed concrete sleepers in which parallel reinforcing Wires under i h tension are arranged in long production lines having roller tracks for the movement of trough-shaped moulds, empty moulds are supplied to said production lines by a transverse conveyor track below said production line track, each empty mould is elevated from the transverse track to the level of the appropriate production line and moved to a concrete-filling station and filled with concrete which surrounds the wires in the moulds, the mould is moved to a concrete-setting position in said production line and left till the concrete is hard, the finished mould is brought to a discharge position in the production line, the projecting wires are severed, the mould is lowered on to the level of a transverse discharge track and the mould is moved on said discharge track away from the production line.
  • a method for the production of pre-stressed concrete sleepers in which parallel reinforcing wires are arranged in long production lines and subjected to high tension, trough-shaped moulds are arranged to run on roller tracks along said production lines each mould surrounding the reinforcing wires of that line, emptymoulds are introduced to said production lines over a transverse conveyor passing under said roller tracks each empty mould in its turn is elevated from said transverse conveyor-to the level of said roller track and moved to a concrete-filling station and filled with concrete, the, filled mould is moved along said roller track to a concrete-setting position in the production line and left until the concrete is hard, each.
  • mould containing hardened concrete is brought in turn to a discharge position in its production line, the projecting wires are severed and the mould is lowered to the level of a transverse discharge conveyor on which the said mould is removed, the two transverse conveyors and the filling stations being arranged near the mid point of the long production lines.
  • a method for the production of re-stressed concrete sleepers as claimed in claim 1 in which the mould at the concrete-filling station is supported on a vibratory platform and vibrated during filling.
  • Apparatus for the mass production of prestressed concrete sleepers or the like comprising, in combination, an elongated rectilinear trackway, means for supporting a plurality of reinforcing wires under tension in parallel relationship to each other and to the trackway, means for moving a mould transversely of the trackway into such position that the reinforcing wires extend through the concrete receiving space thereof, and means for depositing concrete in a mould so positioned.
  • v 7. The combination set forth in claim 4 in which a vibratory platform is provided, said platform receiving and supporting each mould when in position to be charged.
  • Apparatus for the mass production of prestressed concrete sleepers or the like comprising, in combination, two elongated parallel rectilinear trackways, means associated with each trackway for supporting a plurality of reinforcing wires under tension in parallel relationship to each other and to that trackway, a single means for moving a mould transversely with respect to either trackway into such position that the reinforcing wires adjacent that trackway extend through the concrete receiving space thereof, and means for depositing concrete in a mould so positioned.
  • Apparatus for the mass production of prestressed concrete sleepers or the like comprising, in combination, two elongated parallel rectilinear trackways, means associated with each trackway for supporting a plurality of reinforcing wires under tension in parallel relationship to each other and to that trackway, a single means for moving a mould transversely with respect to either trackway into such position that the reinforcing wires assaasa adjacent that trackway extend through the concrete receiving space thereof, and a single means movable laterally with respect to said trackways for depositing concrete in a mould on either trackway.
  • Apparatus for the mass production of prestressed concrete sleepers or the like comprising,

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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)
US532624A 1943-07-26 1944-04-25 Apparatus and method for the production of prestressed concrete sleepers Expired - Lifetime US2394228A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12154/43A GB572391A (en) 1943-07-26 1943-07-26 Production of pre-stressed concrete sleepers and similar beams

Publications (1)

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US2394228A true US2394228A (en) 1946-02-05

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US (1) US2394228A (d)
BE (1) BE459470A (d)
GB (1) GB572391A (d)
NL (2) NL65174C (d)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507542A (en) * 1946-07-18 1950-05-16 Andrew B Pickett Revetment molding apparatus
US2745164A (en) * 1951-08-30 1956-05-15 Ros Mirko Robin Production of prestressed building elements
US2863206A (en) * 1952-08-27 1958-12-09 Kirchner Ignatz Adolf Apparatus for prestressing reinforcing wires for reinforced concrete parts in mass production
US3128521A (en) * 1959-10-05 1964-04-14 J L Cone Jr C W Cone Apparatus for molding pre-stressed concrete members
US3659986A (en) * 1970-03-16 1972-05-02 Nathan L Gelbman Apparatus for making concrete products
US3694118A (en) * 1969-09-30 1972-09-26 Flowcrete Ltd Production of prestressed concrete
US4249873A (en) * 1977-03-28 1981-02-10 B. M. Costamagna et Cie Manufacture of prestressed products
US4253817A (en) * 1978-07-27 1981-03-03 Martin Concrete Engineering Company Concrete railroad tie casting and handling system
CN116985251A (zh) * 2023-09-25 2023-11-03 邢台炬能铁路电气器材有限公司 一种轨枕自动化生产线
CN117428923A (zh) * 2023-12-21 2024-01-23 蚌埠市蚌铁轨枕有限责任公司 一种钢筋混凝土轨枕预应力张拉装置

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507542A (en) * 1946-07-18 1950-05-16 Andrew B Pickett Revetment molding apparatus
US2745164A (en) * 1951-08-30 1956-05-15 Ros Mirko Robin Production of prestressed building elements
US2863206A (en) * 1952-08-27 1958-12-09 Kirchner Ignatz Adolf Apparatus for prestressing reinforcing wires for reinforced concrete parts in mass production
US3128521A (en) * 1959-10-05 1964-04-14 J L Cone Jr C W Cone Apparatus for molding pre-stressed concrete members
US3694118A (en) * 1969-09-30 1972-09-26 Flowcrete Ltd Production of prestressed concrete
US3659986A (en) * 1970-03-16 1972-05-02 Nathan L Gelbman Apparatus for making concrete products
US4249873A (en) * 1977-03-28 1981-02-10 B. M. Costamagna et Cie Manufacture of prestressed products
US4253817A (en) * 1978-07-27 1981-03-03 Martin Concrete Engineering Company Concrete railroad tie casting and handling system
CN116985251A (zh) * 2023-09-25 2023-11-03 邢台炬能铁路电气器材有限公司 一种轨枕自动化生产线
CN116985251B (zh) * 2023-09-25 2023-12-29 邢台炬能铁路电气器材有限公司 一种轨枕自动化生产线
CN117428923A (zh) * 2023-12-21 2024-01-23 蚌埠市蚌铁轨枕有限责任公司 一种钢筋混凝土轨枕预应力张拉装置
CN117428923B (zh) * 2023-12-21 2024-02-20 蚌埠市蚌铁轨枕有限责任公司 一种钢筋混凝土轨枕预应力张拉装置

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GB572391A (en) 1945-10-05
NL68185C (d)
BE459470A (d)
NL65174C (d)

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