EP0021905B1 - Procédé et dispositif de démoulage d'éléments en béton précontraint moulés sur un long banc - Google Patents

Procédé et dispositif de démoulage d'éléments en béton précontraint moulés sur un long banc Download PDF

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Publication number
EP0021905B1
EP0021905B1 EP80400783A EP80400783A EP0021905B1 EP 0021905 B1 EP0021905 B1 EP 0021905B1 EP 80400783 A EP80400783 A EP 80400783A EP 80400783 A EP80400783 A EP 80400783A EP 0021905 B1 EP0021905 B1 EP 0021905B1
Authority
EP
European Patent Office
Prior art keywords
moulds
reinforcements
mould
elements
tension
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
EP80400783A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0021905A1 (fr
Inventor
Pierre Legrand
Pierre Guinard
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.)
Freyssinet International STUP SA
Original Assignee
Freyssinet International STUP SA
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 Freyssinet International STUP SA filed Critical Freyssinet International STUP SA
Priority to AT80400783T priority Critical patent/ATE3191T1/de
Publication of EP0021905A1 publication Critical patent/EP0021905A1/fr
Application granted granted Critical
Publication of EP0021905B1 publication Critical patent/EP0021905B1/fr
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
    • 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
    • B28B23/06—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 for the production of elongated articles

Definitions

  • the present invention relates to a method and a device for demolding, under tension of the reinforcements which they comprise, of prestressed concrete elements molded on a long bench.
  • FR-A-2 385 510 has also proposed a demolding device carried by a mobile beam on the tracks of the modules.
  • the present invention remedies these drawbacks.
  • each of the elements prior to the relaxation of the tension of the reinforcements, each of the elements is detached from its mold by an upward thrust exerted on a movable portion at least of the bottom of this mold, then kept raised until the tension is released and then cutting of reinforcements.
  • the thrust can be provided by any means (hydraulic, mechanical, pneumatic). For all the rows of molds, the necessary thrusts can be exerted simultaneously or else be staggered over time.
  • the necessary thrusts are provided by sets of mobile ramps in inclined plane, coupled in file and movable, along the elongated area, by a tractor mechanism.
  • the latter is advantageously formed by one or more cylinders.
  • each ramp to a movable portion of the mold is preferably obtained by means of a guided pusher, directly or indirectly operated by a sliding pad or a roller cooperating with said ramp.
  • the molds capable of sliding on elastic supports so as to allow, on the one hand their longitudinal positioning on the bench, on the other hand their vibrations after filling, are associated, each with relative vertical freedom of movement, to a crew capable of rolling on the mobile ramps, harnessed in file by means of traction, crew comprising surfaces capable of acting, after an adjustable dead travel, on the pushers ensuring the moving the movable mold portions.
  • the base A of the long bench is an elongated concrete slab, parallel to which the courses of reinforcement B made of hard steel are stretched between a tension trimmer (not shown) associated with a long-stroke cylinder device and a tension trimmer (also not shown) which, during a final operation, allows the reinforcement to be released.
  • Each mold C suitable in this case for the simultaneous manufacture of six elements D of prestressed concrete (in this case railway sleepers), is carried by two beams 1 which rest on the base A by means of four pads 4 sliding on the pads 2 made of elastomer, covered with sheet 2a.
  • the lifting of the molds is prevented by the bars 3 which pass through the longitudinal members 1 of the mold in the longitudinal slots 6 and are fixed at each of their ends, between two nuts 7 with two vertical uprights 8 sealed in the base A.
  • Each compartment D of mold C crossed by four of the reinforcements B, comprises towards its ends (see FIG. 3) a movable part 9 of its bottom 10, movable part covered with a flexible menbrane 11 made of elastomer or whose joint with the part fixed is covered with a section of lost adhesive tape to prevent any intrusion of laitance in the lifting mechanism of this mobile part.
  • the movable part is integral with a pusher 12 movable in the guide 13 fixed to the mold compartment, a guide which is extended by the adjustment stud 14 with a lock nut 15.
  • the lower ends of the studs 14 (14 1 to 14 6 in FIG. 2) are placed opposite the upper face of a cross member 17, provided at its ends with yokes 18 carrying the rollers bearing 19.
  • rollers 19, located in the same plane and associated with two consecutive molds C roll on the same ramp 20a of an inclined plane plate 20 which can slide, between two guides 30, on the upper face d another flat metal plate 21 sealed on the base A by means of the raised concrete stud 22, attached to this base.
  • the plates 20 of the same alignment are coupled together by the connecting rods 23 comprising the locking nuts 24 and the length adjustment lanterns 25.
  • the two cross members 17, associated with the same mold C are interconnected by the side members 5, so as to form a frame surrounding the base of the mold.
  • each of the molded elements when after casting, vibration and steam hardening of the concrete in the mold compartments, each of the molded elements must be extracted from its mold, without relaxing the reinforcements, a traction is exerted in the direction of the arrow F on the all the rows of plates 20 coupled by the rods 23.
  • the rollers 19 and, consequently, the cross members 17, are raised, relative to the mold, while the lifting of the molds is prevented by the bars 3.
  • the cross members 17 thus come into contact with the studs 14 providing the thrust which lifts the moving parts 9 of the molds.
  • the concrete elements are then detached from their molds and slightly lifted from their bottom. Compared to the length of the reinforcement courses, the slight transverse displacement which results for them hardly changes the tension of these reinforcements. It would, moreover, be possible to simultaneously raise the fastening brackets for these frames.
  • the expansion is carried out, by the end of the bench towards which the plates 20 are displaced (arrow F) so that the displacement of the concrete elements and their molds, resulting from the loosening of the reinforcements, is carried out opposite direction of arrow F, in order to increase the lifting effect of the molded elements.
  • the tensile force on the rods 23 can be supplied by jacks.
  • the ramps having a slope of between 4 and 7%
  • the stroke of the jacks can be of the order of a few decimeters, so that the lifting is of the order of the centimeter.
  • the values of the distances d can be adjusted for the same cross member 17 (or several cross members 17) of so as to obtain successive detachment effects.
  • the invention applies to elongated elements of prestressed concrete by adhesive wires which must have, on their molded faces, hollows or reliefs of reduced height but with a strong draft slope; these elements can be railway sleepers, poles, door frames, pylons for transporting electrical energy.

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)
  • Moulds, Cores, Or Mandrels (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP80400783A 1979-06-13 1980-06-03 Procédé et dispositif de démoulage d'éléments en béton précontraint moulés sur un long banc Expired EP0021905B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80400783T ATE3191T1 (de) 1979-06-13 1980-06-03 Verfahren und vorrichtung zum entformen vorgespannter, im spannbett hergestellter betongegenstaende.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7915131A FR2458368A1 (fr) 1979-06-13 1979-06-13 Procede et dispositif de demoulage d'elements en beton precontraint moules sur un long banc
FR7915131 1979-06-13

Publications (2)

Publication Number Publication Date
EP0021905A1 EP0021905A1 (fr) 1981-01-07
EP0021905B1 true EP0021905B1 (fr) 1983-05-04

Family

ID=9226547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400783A Expired EP0021905B1 (fr) 1979-06-13 1980-06-03 Procédé et dispositif de démoulage d'éléments en béton précontraint moulés sur un long banc

Country Status (10)

Country Link
US (1) US4330243A (enrdf_load_stackoverflow)
EP (1) EP0021905B1 (enrdf_load_stackoverflow)
JP (1) JPS5820771B2 (enrdf_load_stackoverflow)
AT (1) ATE3191T1 (enrdf_load_stackoverflow)
BR (1) BR8003667A (enrdf_load_stackoverflow)
CA (1) CA1160819A (enrdf_load_stackoverflow)
DE (1) DE3062952D1 (enrdf_load_stackoverflow)
ES (1) ES492251A0 (enrdf_load_stackoverflow)
FR (1) FR2458368A1 (enrdf_load_stackoverflow)
IN (1) IN154503B (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2604944B1 (fr) * 1986-10-01 1990-08-10 Costamagna & Cie B M Dispositif perfectionne de demoulage et de manutention des produits en beton coules en moules fixes
JPS6438356U (enrdf_load_stackoverflow) * 1987-08-31 1989-03-07
BE1004584A3 (nl) * 1990-08-29 1992-12-15 Coussee Marc Werkwijze en inrichting voor het gieten van t-vormige balken uit voorgespannen beton.
NL9002531A (nl) * 1990-11-20 1992-06-16 Schokbeton Bv Inrichting voor het vervaardigen van voorgespannen betonnen dwarsliggers voor spoorrails, alsmede dwarsliggers vervaardigd onder toepassing van deze inrichting.
CZ2011732A3 (cs) * 2011-11-15 2013-05-22 Active Optix S.R.O. Zpusob výroby výrobku z geopolymerního kompozitu
CN116876905B (zh) * 2023-07-10 2024-02-23 广东永基电力器材厂有限公司 一种钢板复合式混凝土电杆及其制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB726370A (en) * 1953-06-17 1955-03-16 Eugen Schulz Improvements in or relating to the manufacture of concrete bodies
US3611518A (en) * 1969-10-30 1971-10-12 American Concrete Crosstie Co Apparatus for removing cured concrete articles from pallets
US4102957A (en) * 1975-11-20 1978-07-25 Canfarge Ltd (Francon Division) Apparatus and method for manufacturing prestressed concrete railway ties
FR2385510A1 (fr) * 1977-03-28 1978-10-27 Costamagna & Cie B M Perfectionnements a la fabrication de produits precontraints
FR2434693A2 (fr) * 1977-03-28 1980-03-28 Costamagna & Cie B M Perfectionnements a la fabrication de produits precontraints
SE408535B (sv) * 1977-04-29 1979-06-18 A Betong Ab Sett att i en lang formbedd tillverka flera pa varandra foljande byggnadselement samt formbedd for utforande av settet
FR2403431A1 (fr) * 1977-09-14 1979-04-13 Costamagna & Cie B M Perfectionnements aux poutrelles en beton precontraint
BE877734R (fr) * 1978-08-31 1979-11-16 Costamagna & Cie B M Perfectionnements a la fabrication de produits precontraints

Also Published As

Publication number Publication date
ES8101456A1 (es) 1980-12-16
JPS5820771B2 (ja) 1983-04-25
ATE3191T1 (de) 1983-05-15
FR2458368A1 (fr) 1981-01-02
ES492251A0 (es) 1980-12-16
EP0021905A1 (fr) 1981-01-07
IN154503B (enrdf_load_stackoverflow) 1984-11-03
DE3062952D1 (en) 1983-06-09
JPS562111A (en) 1981-01-10
BR8003667A (pt) 1981-01-13
CA1160819A (en) 1984-01-24
US4330243A (en) 1982-05-18
FR2458368B1 (enrdf_load_stackoverflow) 1982-10-22

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