WO1986001767A1

WO1986001767A1 - New techniques and machine for producing, projecting and transferring glass fibre-based concretes and the like

Info

Publication number: WO1986001767A1
Application number: PCT/FR1985/000254
Authority: WO
Inventors: Jean Vignolles
Original assignee: Jean Vignolles
Priority date: 1984-09-19
Filing date: 1985-09-19
Publication date: 1986-03-27
Also published as: FR2570321A1; FR2570321B1; EP0194297A1

Abstract

Technique and equipment for producing, projecting and spreading glass fibre-based concretes and similar coating products. Said machine is characterized in that it comprises a frame (1) mounted on wheels (2) and on which is secured a mixing tank (4) traversed by a horizontal axis (7) carrying mixing vanes (9), a driving hub (17) which rotatingly drives said axis, a hopper (20) for the preparation of the glass fibre material. A pumping hub (25) of the peristaltic type for the mixed product entrained by said driving hub (17), sucks from a hopper (33) and vehicles to a lance (36). An air compressor (32) driven by said driving hub (17) and connected by a flexible line (37) to the lance, a cap (38) to the lance (36) enables the control. Application to the production, projection and transfer of fibre concretes.

Description

- -

NEW TECHNIQUES AND MACHINE FOR THE DEVELOPMENT, PROJECTION AND TRANSFER OF CONCRETE BASED ON FIBERGLASS AND THE LIKE.

The present invention relates to an implementation technique, and to a material intended for spraying or injecting concrete based on fiberglass.

For many years, concrete made from fiberglass has been produced as a reinforcement. Very successful results have been observed, but unfortunately, these technical performances have disappointed over time; because we noticed that the alkali of the cement deteriorated these fibers and neutralized all resistance.

An English company has developed a new glass fiber based on "ZIRCONIUM", which has the particularity of resisting attack by alkalis in cement. A system of simultaneous projection of fibers and laitance of ci¬ ment in the manner of polyester projections thus makes it possible to produce very resistant elements.

Then a new, simpler formula was used. This is the ready-mixed bag, comprising, cement, sands, resins and cut glass fibers. The whole being mixed with water, in a concrete mixer or a mixer, then used manually or by means of a screw pump and Stator for spreading or spraying. But great difficulties are encountered in conveying the product in pumps and pipes, especially if the fibers are long and of a percentage greater than 2%. In addition, it was found, despite the treatment, a strong deterioration of the fibers which are subsequently attacked by the alkali of the cement. these drawbacks are due to two main phenomena:

1 °) During mixing, the fiberglass which is made up of a multitude of strands is literally defibrated by wear of the sand and cement, and the treatment is partly neutralized. As a result of this defibration which causes towing, an additional quantity of water is necessary for mixing. 2 °) Rotary pumps with neoprene screws and nuts, which are commonly used, amplify this phenomenon due to the crushing by the screw system. In addition, these tow packs thus formed form filtration buffers which clog the pipes. The object of the present invention is to remedy all these drawbacks by using a specially designed machine and a preparation technique. Also • transfer and projection are ensured by a machine equipped with a peristaltic pump. To this end, the subject of the invention is the technique for the preparation and production of equipment intended for the preparation of concrete mortar based on glass fiber or the like.

Characterized in that it comprises, a chassis mounted on wheels on which is fixed a horizontal mixing tank crossed by a horizontal axis on which are fixed small mixing pallets. The horizontal axis is connected by a set of chain sprockets to a reduction motor driven by a motor and pulleys. - the container is closed by a hinged lid fitted with security. On the upper part of the cover are fixed two troughs. ^'

- communicating by a rectangular cutout with the interior of the tank, a simple trough makes it possible to pour the mixture: water, cement, sand; the other trough having in its center a crank axis furnished with pallets, makes it possible to defibrate and distribute the fiberglass on the mixture.

On the chassis is also fixed a peris¬ taltique pump, driven by means of a reduction gear, of a gearbox with reverse gear and declutching, coupled to an internal combustion or electric motor. At the pump is fixed a hopper in the shape of an inverted pyramid with curved edges in which the mixer empties. The outlet of the pump is connected to a pipe used to supply a spreading or projection lance on which the remote control means are also attached.

Other characteristics and advantages will emerge from the description which follows, of the embodiment of the machine above, - description given by way of example only and with reference to the appended drawings in which Fig I shows a schematic top view of a first embodiment of a machine according to the invention. Fig II shows a side view of the machine of fig I. Fig III shows a section of the mixer-defibrator part. The machine shown in Figures I to 3 includes a chassis (I) mounted on wheels (2) and towed by the intermediary of a coupling arm (3). On the frame (I) is mounted a tank (4) with a slight inclination. The lower part of the tank (4) is rounded and determines a substantially semi-cylindrical trough with a horizontal axis. At the base of the tank (4) towards the front face, a control (5) allows the opening of a drain hatch (6). In the axis of the trough is arranged a horizontal shaft (7) mounted on a bearing (8) at each end and carrying pallets (9) consisting of a flat iron curved on the field and terminated by a return in the form of "Golf Club".

These pallets are spaced in rotation around the shaft and are slightly twisted, in order to obtain an angle of approximately 45 °. Therefore, the bottom of the trough (4) is perfectly swept in order to expel the product towards the hatch (6).

At the rear end the shaft (7) carries a pinion (10) engaged with an endless chain (II) driven by a motor pinion (12) output from a reduction gear (13). The reducer (13) comprises an input pulley (14) with two stages, driven by two belts (15- I5a) from a two-stage pulley (16) keyed onto an operating motor (17) or electric. For example carried by the chassis (I). The two belts (15 - I5a) with a diameter greater than the distance of the two pulleys (14 and 16) disengage or drive simultaneously during the application of the device with tilting roller (18 - I8a) thereby the horizontal stirring shaft (7) is stopped and can have a slow speed and a fast speed. The gauge (4) is closed by a rocker cover. Two cutouts on the face of the cover allow to receive the adjustment of a hopper (19) used to pour the sand, cement, water mixture; and a hopper (20) receives the dose of bulk fiberglass. The funnel-shaped hopper (20) of rectangular section is traversed at its lower part by a pin (21) drilled and railed in staggered fashion by the pins (22) of curved shape and of sufficient height. slotted to be flush with the faces of the hopper section. Between each nipple over the axis, a grid (23) per¬ puts during the rotation of the crank (24) defibration and the distribution of the fiber in the mixer and in the laitance formed in the mixer.

Below the mixer on the chassis (I) is mounted a pump (25) of the peristaltic type, the horizontal motor shaft of which is driven by a reduction gear (26). The reduction gear (26) is coupled to a gearbox (27) with clutch. This box (27) by means of lever (28) makes it possible to obtain 5 speeds; neutral, and reverse. A pneumatic cylinder (29) allows action¬ ner the clutch of the box (27). The box (27) is accou¬ pled by the seal (30) to the internal combustion or electric motor (17). The motor (17) with two shaft outputs, also driven by a clutch (31) and a pulley and belt assembly, an air compressor (32) allows both compressed air autonomy for projection and declutching control (29). On the inlet and outlet sides of the pump (25) set at around 45 °, a hopper (33) of well-defined pyramidal shape with rounded edge is adjusted and fixed in order to allow the plaster to slide perfectly. The evacuation pipe (34) of the pump (25) opens at the top of the internal face of the hopper (33) to terminate on the upper and outer side of the hopper. The pipe (34) is connected to a flexible pipe (35) which terminates in a spray lance (36), juxtaposed with the pipe (35) a pipe (37) of compressed air connects the compressor (32) to the lance ( 36) and allows the dissemination of the projected product.

On the compressed air circuit, at the lance, the valve (38) by its closure increases the air pressure which, by means of the hose (39) from the compressor to the jack (29), allows disengagement and stopping the pump. The operation of the device shown and described above is as follows:

Preparation in the kneader (4) of a mortar into which very treated glass fibers are introduced. Emptying into a hopper coupled to a pump which feeds a hose with a spray lance allowing both with compressed air, spraying or spreading on walls of said product.

Operation: after starting the engine and compressor, the pump (25) being disengaged, the clutch device (18) is engaged to rotate the shaft (7) of the mixer at low speed. Through the hopper (19) a defined quantity of water, cement, sand and various resins is poured. Then by the clutch device (18 - I8a) we pass in high speed of rotation for about 2 minu¬ your. The mixture is left to stand for approximately 3 to 4 minutes and is mixed again at high speed for 2 minutes. This process makes it possible to obtain a much more fluid mixture. By the clutch device (18) we return to low speed. The quantity of corresponding fibers has been introduced into the defibrator (20). By rapidly turning the crank (24), the fibers are introduced onto the knives of the mixer which incorporate them into the mixture without damaging the fibers. 30 seconds after the exhaustion of the fibers, the mixer can be emptied into the ^' hopper (33) located below. The arrangement of the pallets (9) on the shaft of the mixer per¬ puts a good evacuation of the mixture. The rotation (18 - I8a) stops the rotation of the mixer.

The hopper (33) is lined with fiber concrete by means of the piston (29). The pump is disengaged or engaged to the gearbox by the lever (28) controlling the desired rotation speed, which will correspond to the quantity of sprayed product desired. By opening the valve (38) to the lance by loss of air pressure, the gearbox (27) driven by the motor (17) is engaged. The gearbox (27) is coupled to a reduction gear (26) driving the peristaltic pump (25).

The product from the hopper under load on the suction of the - pump is conveyed via a flexible hose (35) to the lance (36). The arrival of compressed air via the pipe (37) and the tap (38) allows the spraying of the coating. If you suppress the air intake on the lance, you can also spread the product By its roller system crushing a pipe, the peristaltic pump allows the transfer of product with a minimum of deterioration.

If in the circuit a blockage occurs, it is easy by the tap (38) to stop the operation of the pump, by positioning the lever (28) of the gearbox at reverse speed, you can decompress and discharge the cap, the pump being reversible.

The present invention thus makes it possible to remedy all the difficulties of preparation, transfer and projection of fiber concrete and other similar plasters. The technique of preparation of the mixture with incorporation of the fibers with an appropriate material makes it possible to preserve the fiber concrete all its qualities after aging. The very simple and robust material is extremely easy and efficient to use.

Of course, the invention is obviously not limited to the embodiments, represented and described above, but on the contrary covers all the variants, namely: the machine is mono-block or in two elements separated by mixer and pumping unit.

This batch concrete fiber preparation system, can alternatively, by an automation assembly be made continuous.

Claims

1 Process for the preparation of concrete based on glass fibers for projection, characterized by the fact:

- that a fluid mortar with a defined quantity of water, cement, sand and various resins is prepared by kneading at high speed of rotation for a period of approximately 2 minutes, the mixture is left to stand for approximately 3-4 minutes, we mix again at high speed for 2 minutes,

that a defined quantity of fibers is introduced at low speed using a defibrator (20) on the knives of a mixer (4) which incorporates them into the mixture without damaging the fibers,

- which is then poured into a hopper (19) for cou¬ lage or projection using a peristaltic pump (25).

2 Device for implementing the method according to claim I, characterized by a machine comprising a frame (I) mounted on wheels (2) and on which is fixed a mixing tank (4) crossed by a horizontal arm ( 7) both of the mixing paddles (9) a motor hub (17) for driving the said arm in rotation, a hopper (20) for distributing and metering over the entire surface of the milk this contained in the hopper, the fiber which is thus directly incorporated, a pumping means (25) of the peristaltic type of the kneaded product driven by said motor hub (17) and connected by pumping hopper (33) d on the one hand and flexible channeling (35) on the other hand to the projection lance (36). An air compressor (32) driven by said driving hub (17) and connected by a flexible pipe (37) to said lance (36) the latter being provided with control means (38).

3 Machine according to ^" claim 2, characterized in that it comprises a mixer (4) with a horizontal shaft (7-) on which is fixed pallets (9) curved on the field and terminated in the form of" Golf Club ". These pallets are spaced in rotation around the shaft (7) and are widely twisted to finish with an angle to the axis of about 45 °.

4 Machine according to claim 2 or 3, characterized in that it comprises a hopper (33) in well-defined inverted pyramidal shape, with rounded stop under load on the suction of the pump (25).

5 Machine according to one of claims 2 to 4, caracté¬ ized by a one-piece design.

6 Machine according to one of claims 2 to 4, characterized by a design in 2 separate elements mixer and pumping unit.