FR2657382A1 - INDEPENDENT MODULE FOR MANUFACTURING PRE-STRESSED CONCRETE AND ITS IMPLEMENTING METHOD. - Google Patents

Abstract

Module for manufacturing flat or elongated products in prestressed concrete, of the type comprising either a plate or a series of molds juxtaposed parallel to each other, in which are arranged at least one steel wire anchored in two headers, characterized in that that it comprises a rigid frame consisting of two parallel beams (2) between which are arranged the molds (3), and two headers, one (5) fixed, mounted at one end (7) of the side members, the other (6) mobile, connected to each side member by a tensioning jack (9).

Description

INDEPENDENT PRE-STRESSED CONCRETE MANUFACTURING MODULE

AND METHOD FOR IMPLEMENTING IT

  The present invention relates to an independent module for manufacturing prestressed concrete and the

  method of implementing this module.

  Among the products produced in building technology are the pre-slabs. These are generally prefabricated slabs of reinforced concrete of low thickness, used in the composition of a composite floor and serving as formwork for concrete.

sunk in place.

  One of the techniques for manufacturing the slabs is the carousel technique. It is a closed circuit made up of successive stations, each station corresponding to a particular operation. The carousels generally include the following stations: Steaming, demoulding, concreting, evacuation of cleansed products. e of the molds 1 oiling 2 formwork____, installation of the armatures This technique is well suited to the production of medium-sized elements of the order of the meter (lm to meter), transportable from post to post and inside of the oven, and likely to be

handled easily.

  It also adapts to rhythms of

  variable production, in particular according to demand.

  However, if this carousel technology is flexible, it is to the detriment of the rate of use of the installation. In fact, since the pre-slab product is only produced on demand, its production is significantly modeled on an irregular market in quantity over time. , the frequency of variation being weekly In such a context it turns out that the potential of the manufacturing unit does not necessarily correspond to the maximum of the market because on the one hand, the latter only corresponds to very specific peaks and on the other hand evolves over time; the production unit would then be frequently underused and

  at times undersized in potential.

  An objective of the invention is on the one hand to increase the rate of use of a carousel for manufacturing concrete products, and on the other hand to regulate this production, by introducing into the carousel the manufacture of products usually sold from stock, such as prestressed concrete products. Among these, pre-stressed concrete beams and slabs, among others, are products with high demand; their manufacture is traditionally carried out in molds placed on long benches (of the order of 50 to meters) This technique of manufacturing beams on large benches, if it is well developed, however presents constraints: the beams are necessarily all of the same model; it is impossible to manufacture products of different shapes in a module, nor from one module to another; the number of prestressing wires is identical over the entire length of the bench, the prestressing bench is an installation

  bulky, fixed, with significant civil engineering.

  Finally there are independent modules, of reduced size which are simple trays used: 3 for the formwork of products but they do not allow

realize the prestress.

  Another objective of the invention is the production of a module for manufacturing small and independent prestressed concrete products. The subject of the invention is a module for manufacturing flat or elongated products of prestressed concrete, of the type comprising either a plate or a series of molds juxtaposed parallel to each other, in which are arranged at least one anchored steel wire. in two headers, characterized in that it comprises a rigid frame consisting of two parallel beams between which the molds are arranged, and of the two headers, one fixed, mounted at one end of the beams, the other mobile, connected to each

  side member by a tensioning cylinder.

  This module is further characterized in that the side members are kept parallel by at least two spacers arranged in the same plane on which the

  tray or molds are arranged.

  The invention also relates to the method of implementing this module This is introduced on a circulation path in a carousel comprising at least the successive stages of manufacture following oiling of the molds, formwork, installation of wires steel, tensioning, concreting,

  steaming, demoulding, and cleaning of molds.

  The invention also relates to the following provisions: 1 demolding comprises the following successive operations: using a handling device mounted on double brackets or gantries, the module is lifted, turned over and placed on a receiving support; the steel wires are slack and the products deposited on the support

  the empty module is cleaned, and returned.

  2 in addition, depending on the type of product and / or the size of the manufacturing unit, the module, once raised, is removed from the circulation path and the

  product is demolded on a track, away.

  3 the demoulding includes a vibration phase before the steel wires are relaxed, and / or is carried out

by gravity.

  3 demolding is carried out by ejection after

slackening of steel wires.

  4 the module is secured to a table, a beam or in a frame having at the end two aligned axes of rotation, intended for lifting and

flipping the module.

  the module is secured to the arms 16 of the brackets 15 which have axes 14 of rotation, intended for lifting the module and turning it over. 6 the module is secured to a table, a beam or a frame mounted in at least one crown

  intended to return the module while driving.

  The subject of the invention is also the flat or elongated product of prestressed concrete produced in a module as defined above, and by the method

as characterized above.

  The invention is illustrated by the appended drawings in which: FIG. 1 is a schematic perspective view of a specialized module for elongated products according to the invention; Figure 2 is a view along II-II; Figure 3 is a schematic perspective view of a specialized module for flat products according to the invention; Figure 4 is a view along III-III; FIG. 5 is a diagram of a variant of the method for inverting the module according to the invention; Figures 6 to 9 are diagrams illustrating a second variant of the method of turning the module according to the invention; FIG. 10 is a diagram of a third variant of the method for inverting the module according to the invention; Figure 11 is a diagram of the carousel of

  processing of the module according to the invention.

  As can be seen in FIGS. 1 and 4, the module 1 is a rectangular frame inside which molds 3 are arranged parallel to each other or a tray 3 bis receiving formwork The frame is formed on the one hand from two longitudinal parallel beams 2, or equivalent elements, dimensioned to take up the prestressing forces, held by spacers 4 preferably profiles, on the other hand by two headers 5,6 perpendicular to the beams of type known per se, in which are

  anchored with prestressing steel wires.

  One 5 of the two headers is fixed, rigidly mounted at one of the ends 7 of the side members, the other 6 is mobile and is connected to the opposite ends 8 of said side members by a jack 9 for tensioning. The mobile head member is equipped a device for anchoring the steel strands known per se, and described in

Patent FR-A 76 39 408.

  The upper surface of the spacers 4 defines

  a plane on which the molds rest (Figure 2).

  Two sections 10 are also arranged along the side members 2, on the outside. Apart from the movable header 6, the components 2,3,3 bis, 4,5,9 are mechanically rigidly assembled so that the various manipulations do not entail

  no harmful deformations.

  There is a device for handling the

  module which includes a gripping system

  ci associated with a mechanism having the kinematics necessary for lifting, turning and lowering the

module (Figures 6 to 10).

  Two kinds of devices are provided: either a table 11, or a libis beam or a metal frame 12 for gripping mounted on two gantries 13 or a pair of brackets 15 provided with arms 16, having a gripping system from below the module or at each of its ends In either case, axes 14 allow pivoting. These modules 1 and their turning system can be incorporated into the various systems for manufacturing concrete elements by carousels, therefore their dimensions are variable. However, a width of 2.70 mx 12.50 m long can be fixed as an average base. and a height requirement of around 60 cm; this last dimension is dependent on the products to be manufactured while the other two are more related to the geometry of the manufacturing carousel

who will receive the modules.

  A carousel can receive, together with the usual tables, several modules, these may be different as for the products produced, such as

  prestressed concrete beams, pre-slabs

  treacherous, etc. On the other hand, only one turning system

generally sufficient.

  According to the invention, the module is based on rollers, some of which are motor, and circulates from one station to another in the carousel to which it is adapted; it is the subject of the usual operations for manufacturing prestressed concrete products with a few modifications which make it original and

the interest of the process.

  The usual carousel comprises the following stations 101 to 107: oiling of the molds 101, formwork 102, installation of the reinforcements 103, concreting 104, baking at a temperature of 60 ° C., demoulding 106, and

mold cleaning 107.

  Depending on the products, in particular the beams, the shuttering operation 102 can become very brief in handling time, it is then called "complement of

formwork ", even nonexistent.

  The carousel according to the invention comprises two different stages, which replace the operations planned for the manufacture of the slabs: 1 e the positioning of the reinforcements 103 is replaced by the operation of placing the steel wires 108 , followed by their energization 109; This workstation is special in that it includes a hydraulic unit 110 which is

connects to the cylinders 9.

  2 demolding is carried out by turning performed by the handling device described above. Demoulding takes place directly on the circulation path when the carousel is used for a long period or quantity of flat or elongated products; it is carried out away from said path when it is a small quantity, for example

between two series of slabs.

  The pair of brackets 15 or the gantries are arranged near the circulation path The arms 16 or the table 11 or the beam 1 ibis or the frame 12 come to grip the module, lift it and, as the case may be, pivot it around axes 14, and deposit it on a reception support previously arranged on the circulation path, or move it out of the circulation path before turning it over and

  to deposit it on a reception support.

  If necessary, the module is subjected to a vibration, then it is connected to the hydraulic unit to

  relax the wires 112, and deposit the products 114.

  The empty module is then cleaned, reassembled,

  returned and returned to its travel route 113.

  It will be noted that this demolding process by turning allows demolding by simple gravity, or by vibration + gravity, or by gravity aided by

ejectors known per se.

  In addition, the steaming 105 is carried out at a variable temperature of up to 90 ° C. For this purpose the enclosure will be provided with a temperature regulation device making it possible to choose the temperature according to the products to be steamed: for example

  'C for pre-slabs, 90 C for beams.

  FIG. 3 illustrates a variant of the inversion process: the module after baking installed in two rings 17 or parallel wheels, the displacement of which effects the inversion This variant advantageously makes it possible to avoid the use of brackets

or gantry cranes.

  The originality of the module and its implementation process lies in the fact that the tensioning device (jacks and headers), although known per se, remains in place on the prestressed concrete module itself, and follows it in all its movements, which supposes the complete absence of ground support for

relieve stress.

  The cylinders are operated by a hydraulic station 110 which is connected to each module when it passes through the station concerned

109, 112.

Claims (12)

  1 Module for manufacturing flat or elongated products in prestressed concrete, of the type comprising either a plate or a series of molds juxtaposed parallel to each other, in which are arranged at least one steel wire anchored in two headers, characterized in that it comprises a rigid frame made up of two parallel beams (2) between which the molds (3) are arranged, and of the two headers, one (5) fixed, mounted at one end (7) of the beams, l '' other (6) mobile, connected to each spar   by a jack (9) for tensioning.   2 module according to claim 1 characterized in that the beams are held parallel by at least two spacers (4) arranged in the same   plane on which the molds (3) are arranged.   3 Method of implementing the module according to   either of claims 1 or 2 characterized   in that the module 1 is introduced on a circulation path in a carousel comprising the following successive manufacturing phases: oiling of the molds (101) formwork (102), placement of the steel wires (108) and tensioning <109), concreting (104), steaming (105), demolding (111,112) and cleaning of mussels (113).   4 Method according to claim 3, characterized in that the demoulding comprises the following operations: 1 (111) using a pair of brackets (15) or mobile gantries (13) associated with a gripping member, the module (1) is lifted, turned over and   deposited on a receiving medium.   2 * (112) the steel wires are slack and the deposited products.   3 (113) the empty module is cleaned, returned,   and replaced on the traffic lane.   Method according to Claim 4, characterized in that the module, once lifted, is moved away from the traffic path.   6 Method according to claim 4 characterized in that the demoulding includes a vibration phase   before the slackening of the steel wires.   7 Method according to claim 4 characterized in that the demolding is carried out by ejection after slackening of steel wires.   8 Method according to claim 4 characterized in that the module is secured to a table (11), a beam (libis), or a frame (12) having two axes of rotation (14) at the end, intended for   lifting the module (1) and turning it over.   9 A method according to claim 4 characterized in that the module is secured with the arms (16> brackets (15) which have axes (14) of rotation, intended for lifting the module and its inversion. characterized in that the module is secured to a table (11) or a beam (libis), or a frame (12) mounted in at least one crown <17) intended to turn the module over weeling.   11 Elongated or flat concrete product   traint characterized in that it is carried out in a   module (1) according to claim 1.   12 Elongated or flat concrete product   traint characterized in that it is carried out by the   method according to any one of claims 3 to 10.