EP0235114B1 - Slipforming extruder for hollow-core concrete elements - Google Patents

Slipforming extruder for hollow-core concrete elements Download PDF

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Publication number
EP0235114B1
EP0235114B1 EP87890001A EP87890001A EP0235114B1 EP 0235114 B1 EP0235114 B1 EP 0235114B1 EP 87890001 A EP87890001 A EP 87890001A EP 87890001 A EP87890001 A EP 87890001A EP 0235114 B1 EP0235114 B1 EP 0235114B1
Authority
EP
European Patent Office
Prior art keywords
auger
flight
flights
core
extruder
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
EP87890001A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0235114A2 (en
EP0235114A3 (en
Inventor
Aimo Seppänen
Lassi Järvinen
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.)
LOHJA PARMA ENGINEERING LPE Oy
Original Assignee
LOHJA PARMA ENGINEERING LPE Oy
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 LOHJA PARMA ENGINEERING LPE Oy filed Critical LOHJA PARMA ENGINEERING LPE Oy
Priority to AT87890001T priority Critical patent/ATE59803T1/de
Publication of EP0235114A2 publication Critical patent/EP0235114A2/en
Publication of EP0235114A3 publication Critical patent/EP0235114A3/en
Application granted granted Critical
Publication of EP0235114B1 publication Critical patent/EP0235114B1/en
Expired 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
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/22—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded by screw or worm
    • B28B3/228—Slipform casting extruder, e.g. self-propelled extruder
    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/084—Producing shaped prefabricated articles from the material by vibrating or jolting the vibrating moulds or cores being moved horizontally for making strands of moulded articles

Definitions

  • the present invention relates to a concrete slab extruder in accordance with the preamble of claim 1.
  • Casting of hollow-core concrete elements with sliding molds, especially hollow-core slabs is based on extruding the concrete mix onto the casting bed by using one or sev­eral core-forming members, e.g. a core-forming mandrel and/or a trowel tube.
  • the concrete mix is compacted by utilizing the pressure generated by the auger flight.
  • a vibrator beam atop the cover part of the machine is vibrated, which combines with the vibration of the core­forming mandrels to effect the final compaction of the concrete.
  • the core-forming mandrel is accompanied with a trowel tube, whose duty is to support the shell walls of the hollow-core slab at the final end of the extruder machinery.
  • the drawbacks of the extruder construction of the hollow-core forming mandrel type include a high noise level, high energy consumption, and a low efficiency of vibration power used for compaction.
  • the present invention aims to overcome the disadvantages found in prior-art constructions and to present a completely new type of extruder which is especially applicable for the compaction of a soil-wet concrete mix.
  • the invention is based on moving adjacent auger flights used for concrete extrusion in a synchronized and counterphased reciprocating manner in the axial direction. Then, the rotating movement of the auger flights generates a continuous and steady feed pressure at the final end of the auger flights.
  • the auger flights in accordance with the invention, and especially their core parts, have an approximately constant diameter, thus deviating from the conventional constructions of conical shape.
  • the difference between the outside diameter of auger flights and the diameter of the auger core is small as compared to the conventional auger construction, which allows a relatively large diameter for the auger core.
  • the invention proposes a decreasing pitch of flights towards the final end of the auger flight.
  • This decrease a pitch is preferably constant, which makes the pitch progressively smaller towards the final end of the auger. Consequently, the pitch of auger flights is essentially smaller at the final end of the auger than at the initial end of the auger.
  • the compaction is furthermore amplified by the axially reciprocating movement of the auger flights.
  • slipforming extruder in accordance with the invention is characterized by what is stated in the characterizing part of claim 1.
  • the noise level generated by an extruder machine in accordance with the invention is essentially lower than in hollow-core extruders based on vibration compaction with a vibration frequency in the range of 150...250 Hz.
  • the slipforming extruder in accordance with the invention is especially applicable to both the production of prestressed hollow-core slabs of the aforementioned type and production of steel-reinforced hollow-core concrete slabs.
  • the slipforming machine shown in Figures 1 and 2 is adapted movable on a casting bed 4.
  • the machine comprises a frame 18, which is adapted movable on rails 20 supported on wheels 19. With bearings rotatably secured to the frame 18, it has five parallel auger flights 2, 25,2 ⁇ with relatively low-profile flights 5,5 ⁇ . Consequently, a core member 26 of the auger flights 2 has an appreciably large and approximately constant diameter in the axial direction.
  • the flight 5 ⁇ has a decreasing pitch over the entire length of the auger 2 ⁇ .
  • Each final end of the augers 2 carries a stiffly mounted core-forming mandrel 3 and/or a trowel tube.
  • the drive and power train system 7, 15, 16, 17, which is provided for rotating the auger flights 2, is adapted to the movable frame 18.
  • This drive and power train system comprises an electric motor 17, which drives the auger flights 2, 25 via a chain sprocket 16 and a chain 15 by chain sprockets 7, which are mounted onto shafts 6 of the auger flights 2, 25.
  • the concrete poured from a hopper 1 is adapted to flow to the initial end of the auger flights 2.
  • a hollow-core slab 23 to be cast is bordered from below by a bed 4, from the sides by side members which are not shown, and from above by vibrating top beams 21 and 22.
  • a core-forming mandrel 3 forms a cylindrical void 24.
  • the frame 18 also carries secondary drive and power train system 8...14. It comprises an electric motor 14 together with a crankshaft assembly 10, which is driven by the motor and attached to shafts 6 of the adjacent auger flights 2, 25.
  • the assembly is connected via connecting rods 9 to ends 8 of shafts 6 of auger flights 2 so as to make the adjacent auger flights 2, 25 move in a synchronized and counterphased reciprocating manner in the axial direction during the operation of the slipforming extruder machine.
  • the frequency of the reciprocating movement of the auger flights 2, 25 is 0.3...100 Hz, preferably 5...10 Hz.
  • the amplitude of the reciprocating movement (stroke length) is 0.5...50 mm, preferably about 10 mm.
  • the reciprocating movement at the final end of the extrusion phase performs an extremely effective compaction of concrete.
  • the reciprocating movement of the augers 2, 25 creates pressure variations in the concrete by combining the constant rotation of the augers to the pushing motion at the push phase of the augers and thus imparting a transverse shear in the concrete mix. This also forces the concrete aggregates to perform a shearing flow in the direction transverse to the axial flow.
  • the core-forming mandrel 3 as an immediate extension of the auger 2 gives the void 24 a desired form (in this case, a cylindrical form).
  • the auger 2 ⁇ has a flight profile 5 ⁇ with a height of, for instance, 3...10% of the diameter of the auger 2 ⁇ .

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
  • External Artificial Organs (AREA)
  • Road Repair (AREA)
  • Lining And Supports For Tunnels (AREA)
EP87890001A 1986-01-17 1987-01-12 Slipforming extruder for hollow-core concrete elements Expired EP0235114B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87890001T ATE59803T1 (de) 1986-01-17 1987-01-12 Gleitfertiger fuer hohldielen aus beton.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI860234A FI76516B (fi) 1986-01-17 1986-01-17 Glidgjutmaskin foer tillverkning av haolelement av betong.
FI860234 1986-01-17

Publications (3)

Publication Number Publication Date
EP0235114A2 EP0235114A2 (en) 1987-09-02
EP0235114A3 EP0235114A3 (en) 1987-11-11
EP0235114B1 true EP0235114B1 (en) 1991-01-09

Family

ID=8521979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87890001A Expired EP0235114B1 (en) 1986-01-17 1987-01-12 Slipforming extruder for hollow-core concrete elements

Country Status (6)

Country Link
EP (1) EP0235114B1 (fi)
AT (1) ATE59803T1 (fi)
DE (1) DE3767179D1 (fi)
DK (1) DK22087A (fi)
FI (1) FI76516B (fi)
NO (1) NO870200L (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI115618B (fi) * 1999-03-02 2005-06-15 Valkeakoski Extec Oy Ltd Sovitelma ja menetelmä tiivistysliikkeen aikaansaamiseksi betonin valu koneessa
FI20021561A (fi) * 2002-09-02 2004-03-03 Consolis Technology Oy Ab Menetelmä ja laitteisto betonituotteen valamiseksi

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB391320A (fi) * 1900-01-01
US3177552A (en) * 1962-10-18 1965-04-13 Roth Concrete making machine
US3143782A (en) * 1962-11-01 1964-08-11 Kalns Arvid Concrete slab forming machine
DK111555B (da) * 1966-12-09 1968-09-09 Dansk Spaend As Fremgangsmåde ved successiv forskydning eller udtrækning af et flertal parallelle kerner i en støbeform til fremstilling af udkernede betonelementer og anlæg til udførelse af denne fremgangsmåde.
FI70821C (fi) * 1983-05-09 1986-10-27 Partek Ab Foerfarande och glidgjutmaskin foer gjutning av haolplattor avetong
FI85350C (fi) * 1984-08-24 1993-01-28 Lohja Parma Eng Lpe Glidgjutmaskin foer framstaellning av betongelement och isynnerhet haolelement
FI843544A0 (fi) * 1984-09-10 1984-09-10 Rakennusvalmiste Oy Glidgjutmaskin foer framstaellning av betongelement.

Also Published As

Publication number Publication date
NO870200D0 (no) 1987-01-16
DE3767179D1 (de) 1991-02-14
ATE59803T1 (de) 1991-01-15
FI860234A0 (fi) 1986-01-17
FI76516B (fi) 1988-07-29
NO870200L (no) 1987-07-20
EP0235114A2 (en) 1987-09-02
DK22087A (da) 1987-07-18
DK22087D0 (da) 1987-01-16
FI860234A (fi) 1987-07-18
EP0235114A3 (en) 1987-11-11

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