JPH0135722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing thin fiber reinforced concrete panels and an apparatus for stacking such panels. Such panels are described in U.S. Pat. No. 3,284,980 - Paul E. Dinkel - and include a surface layer of fibrous material on both sides of a core of lightweight concrete in a hydraulic cement mix. It is made by adhering with a thin layer.

Such panels typically have a thickness of 3/8 to 5/8 inches and are used in construction operations as supports for ceramic tiles, exposed aggregate, thin brick, and other functional or decorative materials. .

Traditionally, such thin concrete panels have been manufactured from suitably sized individual molds or other forms placed on a conveyor belt or forming table.

However, in the conventional manufacturing method described above, after the panel is taken out by filling each mold with material and inverting it, each mold is cleaned, treated with a mold release agent, and the production cycle is repeated. It was labor intensive in that it had to be transported to the starting point. In addition, molds take up space not only in general factories but also on curing shelves, and further require equipment to dispose of residual waste from inside the molds and equipment to transport the molds back to the starting point of the process.

The present invention provides a method and apparatus for forming fiber-reinforced panels by continuous operation on a conveyor belt, which eliminates the need for molds, plates, and other molds by disposing a thin web serving as a carrier and release material on the lower surface of the panel. This is what we provide.

That is, in the present invention, a novel method and apparatus for continuously manufacturing lightweight and thin fiber-reinforced concrete construction panels have been discovered.
This method and apparatus eliminates the need for molds, plates and other forms and equipment for handling these forms. The above panel is
A layer of reinforcing fiber material is bonded to the upper and lower surfaces of a central layer made of lightweight aggregate and hydraulic cement using a layer of hydraulic cement slurry. In a preferred embodiment of the present invention, the reinforcing fiber material includes:
A mesh of glass fiber yarn coated with a protective agent such as polyvinyl chloride resin is used. The inventors have discovered that when a novel design of air flotation equipment is used to stack individual panels at the end of a molding operation, a thin web of disposable carrier and mold release material, such as paper coated with a mold release agent, is used. It has been found that by using a mold, it is possible to eliminate the need for a mold or the like. That is, in the forming process, a carrier material is first placed on a conveyor belt, and then each constituent material of the panel is placed on the carrier material. The green, uncured concrete strip thus formed is then cut into individual panels, which are then stacked and cured. On the other hand, freshly formed green panels and sheets of disposable carrier material are soft, weak, and easily crumbled, making them unsuitable for conventional stacking operations; Panels can be stacked without any problem.

The above air flotation device has an air frame equipped with an air film cover divided into two sliding parts, an opening slightly larger in size than the panel to be sent into the air frame, and a lower part of the opening. On the side, there is an adjustable lift table where panels can be stacked.
A large number of orifices are provided on the wall of the opening, and a high flow rate of low pressure air is supplied to the orifices. The air cushion is enclosed by the walls of the frame, the panels already stacked, the two covers and the newly introduced panel.

The inventor's air floating stacking device can be used not only for stacking uncured fiber-reinforced concrete panels, but also for stacking other similar soft flat plates that are difficult to stack without damage or destruction. is clear.

During the stacking process, each panel is floated by an air film and fed onto both covers of the air frame, which are then opened and the panel, together with a sheet of carrier material, is lowered onto the already stacked panels while being supported by the air cushion. do.
This air cushion causes a very small amount of curvature in the panel, but not enough to cause the layers of the panel to collapse. The freshly formed panel is sufficiently flexible that even if the panel warps slightly, it will lie flat on the other panels or pallet boards stacked on the lift table.

The method for manufacturing fiber-reinforced concrete panels according to the invention has very important advantages compared to conventional methods. That is, once the desired number of panels (for example, 10 to 25) are stacked at the end of the production line, these panels do not need to be handled individually until they reach the user. . The stacked panels are transported as they are to a curing workshop where they are completely cured, and then transferred to a strapping workshop where a runner or pallet is placed under the stacked panels and strapped with steel straps. Then, they are transported to a warehouse or shipping factory.

The objects of the present invention are listed as follows.

(a) Simplify the method and equipment for manufacturing fiber-reinforced concrete panels.

(b) Eliminating the need for molds, plates, etc. in the apparatus and eliminating the need for certain steps in the method.

(c) To reduce manufacturing costs by reducing panel handling work and the labor required for it.

(d) To provide an improved means for stacking freshly formed green concrete panels and other flexible and easily damaged generally flat materials.

Next, the prior art of the present invention will be explained.

U.S. Pat. No. 3,284,980 discloses a method for forming thin fiber-reinforced concrete panels in which the panels are formed by laying several successive layers in a mold and then cured in the mold. In this method, after the panels have hardened, the panels must be removed from the mold by, for example, inverting the mold, and the panels must be stacked or otherwise organized in preparation for shipping. Also,
Considerable effort is required in discarding debris from within the mold, cleaning the mold, and applying concrete release agent to the forming surface of the mold. That is, this method involves time-consuming and troublesome work.

U.S. Pat. No. 3,509,010 discloses a method for making a constructed panel comprising a layer of expanded clay particles and hydraulic cement bonded to one or both sides of a sheet metal coating or a fibrous material coating (preferably glass fiber mat). Disclosed. In this method, a composite of expanded clay, hydraulic cement, and glass fiber pine is formed into a continuous strip, which is then cured and cut into individual panels. The patent does not disclose anything about stacking freshly formed green panels or using a separator/carrier sheet between the panels.

U.S. Pat. No. 3,608,003 discloses a method and apparatus for manufacturing lightweight construction panels comprising a layer of expanded aggregate and hydraulic cement coated on one or both sides with fiberglass pine impregnated with hydraulic cement. are doing. However, the panels are formed by a mold that moves on a roller conveyor located below the mold. Subsequently, the molds must be stacked to cure the panels, and after the panels have hardened, the molds must be lowered, the panels removed, and the molds returned to the roller conveyor. This is the trajectory for handling types,
This is an inefficient operation that requires considerable equipment such as carts and lifting equipment. Note that stacking of uncured flexible concrete panels is not disclosed.

U.S. Pat. No. 4,112,173 discloses the use of polyethylene coated paper and paperboard as liners when forming tilt-up concrete slabs one on top of the other. This forming sheet allows the concrete slabs to be easily separated from each other when medium to high density polyethylene is used. However, this US patent does not address the handling of thin uncured panels.

U.S. Pat. No. 4,159,361 discloses a fiber reinforced concrete panel and method of manufacturing the same. In this method, the panels are formed and stacked one by one by a reciprocating material supply device (see Figures 6 and 7 and columns 6 and 7). After the bond release hardener is applied to the top surface of a panel, the next panel is molded over the panel.

Although these prior art disclosures disclose the production of fiber reinforced concrete panels, they involve continuously forming the panels on sheets of disposable carrier material and subjecting the cut green panels to a curing operation and subsequent shipping. There is no disclosure about transporting and stacking for work. Further, the prior art described above does not include the use of air cushions to stack freshly formed flexible green panels.

Next, the present invention will be specifically explained based on illustrated embodiments.

FIG. 1 shows an apparatus for carrying out the present invention.
It consists of a forming section, a cutting section, and a stacking device.

[Molding part]

In FIG. 1, the forming section is formed by belt rollers 2, 2.
a continuous conveyor belt 1 driven by one of the conveyor belts 1 and appropriately supported by table rolls 3, 3, etc., and side rails 4, 4 for shaping the end face of the concrete strip 20 to be formed and regulating its width. , portland cement slurry 1 with side weir (not shown) and transfer roll 9
a pair of nip rolls 8,8 for supplying a controlled layer of 0 and a chute 11 for supplying a uniform layer of the center layer mixture onto the conveyor together with a distributor wheel 12 and a tamping roller 13 for smoothing the center layer. a reciprocating screed (reciprocating leveling bar) 14 which provides final control over the thickness of the screed;
It consists of a side weir (not shown) for supplying Portland cement slurry 19 to the top layer of concrete strip 20 and a second pair of nip rolls 17, 17 with transfer rolls 18.

[Cutting part]

The cutting section shown in FIG.
, a reciprocating cutter 21 , and a replaceable cutting table or block 23 . The air film transfer table 22 includes countersunk orifices 24, 24, . . . spaced several inches apart on its entire active surface, and is supplied with high flow rates of low pressure air by a centrifugal blower (not shown). In this device, an air film is formed by orifices 24, 24, .

Such air film tables are supplied by various manufacturers, such as Southworth Machine Co. of Portland, Maine, USA. The diameter, spacing, and air flow rate of the orifices 24 will vary depending on the size and weight of the panels being transferred. In a typical device, the orifices are 3/16 inch diameter countersinks and spaced 4 inches on center. The pressure of the air stream is typically 1 to 2 pounds per square inch.

The cutter 21 may be a rotating disc or blade, but preferably the moving cutter operates as a moving cutter that moves diagonally across the moving concrete strip so as to cut the panel at right angles.

The cutters are controlled by an electronic controller to cut the concrete strip at predetermined intervals and can be set to cut the panels to the desired length.

Block 23 acts as a non-wearing cutting table and has a surface such as hard wood or durable plastic. This block 23 is
It shall be mounted in the recess 23a by a friction fit or other means for easy attachment and removal so that it can be replaced very quickly when the surface becomes worn. In addition, in order to minimize the reduction of the working surface on the air film table, this block 2
3 uses a narrow one.

Conveyor belt 2 driven by rollers 26
Reference numeral 5 serves as a transport means for transporting individual panels from the cutting section to a stacker. The transfer action is performed by the table 22.
Air flotation device (air float device) similar to 27
assisted by. The working surface of the air flotation device 27 preferably has countersunk orifices 24, 24.
It is equipped with a large number of... and is supplied with high flow rate and low pressure air. The air flotation device 27 forms an air film on the underside of the panel for flotation transport of the panel to the stacking device.

Also, instead of the above means, the conveyor belt 2
Another transfer belt and air film table (not shown) similar to 5 and air flotation device 27 may be used. This operates intermittently faster than belt 25 when feeding panels to the stacker to speed up the feed, and then slows down to the same speed as belt 25 when receiving the next panel. Do it like this. Typically, this transfer section will be longer than the previous transfer section to facilitate speed switching.

[Stacking device]

The air floating stacking device consists of an adjustable lifting table 31 and an air frame 29, the two sliding covers 30a, 30b of the air frame 29 forming an air film table for receiving the panels to be stacked. This stacking device is shown in detail in FIGS. 2-4.

As shown in FIGS. 2 and 3, the air frame 29 has an opening 29a. This opening 29a has the same shape as the panel to be manufactured, but its length and width are slightly larger than the dimensions of the panel to provide a minimum clearance between it and the four end faces of the panel. A large number of orifices 38, 38, . . . are provided on at least one pair of opposing walls in the opening 29a, preferably on all four walls. These orifices are connected to the opening 2 as shown in FIG.
It is arranged near the upper edge of each wall portion in 9a.

Further, in order to seal the four end faces of the stacked panels or the four end faces of the pallet board 33, internally arched buffles 39 are installed along each of the four walls of the opening. This fight full 39
are constructed of spring steel or other suitable metal or plastic so as to provide reliable and flexible contact with the end faces of the panels regardless of the air pressure used to cushion the stack of panels.

The air frame 29 has two covers 30a, 30
The orifices 34, 34, . The orifice 34 is supplied with a high flow rate of low pressure air, eg via a tube 42, to form an air film on the underside of each panel 28 delivered to the stacker. The covers 30a and 30b are slidable on each side. That is, as disclosed in U.S. Pat. No. 4,203,788, each cover 30a, 30b has a sliding structure that includes a pair of racks at both ends, a pinion that engages with the racks, and a motor for driving the pinion. Although it is equipped with a moving cover opening/closing mechanism, its illustration is omitted in FIGS. 2 and 3.

Both covers are initially closed, but once the feeding of the panel 28 onto the air film table is completed, both covers open quickly, allowing the panel 28 to slide over the already stacked panel or pallet while being cushioned by the air space below it. Get on board 33. FIG. 3 shows the sliding cover in an open state (however, only one cover 30b is shown and the other cover 30a is omitted). , and another rail 35b on the opposite side.
Each of them has the following. These rails serve as guides for the covers 30a, 30b. The upper edge of the rail 35a is made to be at the same height as the top surface of both covers, or slightly lower than that, but the rail 35b is made to protrude further above the top surface of both covers, and can be fed in when necessary. It acts as a backstop for the panel.

Further, both rails 35a, 35b are provided with orifices 36, 36, etc., so that when both covers are opened to opposite sides of the frame, pressurized air is supplied to the orifices to assist the air cushion on the lower side of the panel. You may also do so. The supply of air to the orifice may begin when an electronic signal is issued to open the cover.

The covers 30a, 30b each have orifices 37, 37, . . . on their inner end surfaces, and pressurized air is appropriately supplied to these orifices. These orifices direct air as needed to provide additional air support along the centerline of the panel when the cover is opened.

The pressurized air sent through the orifices 37 and 38 not only assists in the air space under the covers 30a and 30b and the panel, but also creates an air seal along each rail and under each cover. It also serves to reduce the escape of the air cushion from inside the air frame.

Another orifice (not shown) located on the underside of the covers 30a, 30b can be used to create an air seal on the underside of the covers.

The number, size and spacing of the orifices and the amount of air supplied will vary depending on the weight of the panels or other flat objects being transported and stacked. Generally, an orifice is an open hole with a diameter of 1/16 to 1/4 inch;
For example, each orifice has a 3/8 inch rib to create an air pocket. Further, the orifices are arranged at intervals as required (for example, a center distance of 4 inches). As shown at 38 in FIG. 4, the orifice is supplied with air via a manifold 41 from a high flow centrifugal blower (not shown). The air pressure used is at the orifice.
Pressures as low as 0.5 to 2 pounds per square inch are usually sufficient. However, the rails 35a, 35
Orifices 36, 36... and covers 30a, 3 of
In cases where an air sealing action is required, such as in the case of the orifices 37, 37, . . . on the 0b end face, a higher air pressure than the above may be required.

An air cushion that lowers an uncured panel onto other panels already stacked without causing damage is provided between the top surface of the already stacked panels or the top surface of pallet board 33 and the bottom surface of the panel being stacked thereon. Consists of trapped air. As shown in FIGS. 3 and 4, the air cushion is maintained by a high flow rate of air from the orifices 38, 38, . A buttful 39 that acts as an air seal by coming into contact with the end surface, orifices 36, 36 on the inside of each lane 35a, 35b provided as necessary, and orifices 37, 37 on the inside end surface of each cover 30a, 30b. It is sealed by the air jetted from... The lifting table 31 is
Top surface of stacked top panel and cover 30
Always keep the distance between a and the bottom surface of 30b to the minimum (a fraction of
1 inch or less). When lowering the next panel 28 onto an already stacked panel, the covers 30a, 30b are opened quickly to minimize air cushion escape.

The arrangement of orifices as described above in the stacking device provides a means of adjusting the air cushion to enable the handling of panels having different weights and different degrees of stiffness (or lack of stiffness). . First, when the covers 30a, 30b are opened, the air cushion is adjusted to support the panel along its centerline and to minimize bowing or sagging of the panel. Next, the air flow from the various orifices must be adjusted to support the panel substantially uniformly and not to impede its descent. That is, in the operation of the stacking device,
A balance is ensured between the inflow and outflow of air in the air frame such that the rate of air escape slightly exceeds the flow rate of air supplied by the various orifices.

EXAMPLES A preferred embodiment of the method according to the invention is as follows (see FIG. 1).

- laying a web 5 of disposable carrier material on the moving conveyor belt 1;

- A web 6 of reinforcing fiber material is passed under the spreader roll 7 and laid on the carrier material.

- Applying a layer of Portland cement to the fiber material by means of a transfer roll 9 fed with a slurry 10 held between the two nip rolls 8,8;

- a center layer mixture of lightweight aggregate, Portland cement and water having a sag-free consistency along a distributor wheel 12 disposed between the side walls (not shown) of the chute 11; Drop from a conveyor belt (not shown). The chute 11 distributes the center layer mixture in a substantially flat layer between the side rails 4,4. Subsequently, this layer is tamped and flattened by a tamping roller 13. If this layer needs to be further leveled, it is leveled with a reciprocating bar (reciprocating screed) 14.

- Laying a web 15 of reinforcing fiber material on top of said center layer mixture. The reinforcing fiber material 15 may be made of the same material as the fiber material 6, but may be made of a different material depending on the desired properties of the panel.

- applying a top layer of Portland cement slurry to the reinforcing fiber material 15 by means of a transfer roll 18, covering the fiber material and adhering it to the center layer mixture;

- a concrete strip 20 comprising a web 6 of disposable carrier material thus formed;
is cut into panels of desired length by a signal while supported by an air film.

- two sliding covers 30a,
Transfer to an air film table equipped with 30b.

- The panels transferred to the air membrane table are stacked on the adjustable lifting table 31 while being supported by air cushions enclosed in the air frame 29. This pneumatic cushion is designed to prevent panels from falling onto other panels that are already stacked.
The function is to hold the panel approximately horizontally.

- Carrying out curing operations on stacked panels.

As described above, air membranes and air cushions allow wet, uncured panels to be transported and stacked without the use of rigid supports such as molds, plates, or other forms. When the stacking device covers 30a, 30b are opened, the air film formed by the orifices on their surfaces prevents frictional and tearing effects on the underside of the panel or the underside of its carrier web. The air cushion also minimizes warpage in the center of the panels, thereby preventing damage to the panels when stacked.

Disposable carrier material (mold release material) webs include paper webs treated with release agents such as silicone, Werner complexes, and fatty acid compounds suitable for releasing concrete formwork, and paper coated on one or both sides with polyethylene or polypropylene. A web of 2 to 2.5 mils or a thin film of inherently releasable plastic such as polyethylene, Teflon (tetrafluoroethylene), polypropylene, etc., may be used, but is sufficiently sized with a basis weight in the range of 30 to 60 pounds. kraft paper or a web of wet-strength kraft paper, manufactured by Nox-Crete Chemical Co., Omaha, Nebraska, USA.
It is preferable to use concrete that has been treated on both sides with a fatty acid-based concrete release agent, such as Nox-Crete's Formwork Coating. The release agent is preferably applied by passing the web between two release agent applicator rollers as the web is fed onto a conveyor belt.

The carrier material web 5 is made wider than the panel to be manufactured, so that both edges are slightly exposed beyond the panel. The side rails 4, 4 are appropriately arranged on the conveyor belt so that there is a clearance between them and the conveyor belt that allows the web to pass, and the above-mentioned both side edges of the web pass under the side rails 4, 4. . This disposable carrier material web 5 performs two functions. The first is the carrier of the concrete strip as it is formed and cut on the conveyor belt, and the carrier of each panel as it is transported and stacked; the second is the function of the stacked panels after curing. It acts as a separator sheet between the panels, allowing the panels to be separated when the user takes them out. Note that since the web is made wider than the panels, the panels can be easily separated from each other.

Additionally, to further facilitate separation between the cured panels, a light layer of release material such as fine sand or plastic particles may be spread over the top of each panel, e.g. at the transfer or stacking station, before the panels are stacked. You may.

In a preferred embodiment, the reinforcing fiber material is a knitted web of glass fiber threads. That is, glass fiber threads are coated with polyvinyl chloride resin or other protective thermoplastic polymer, knitted, and then heat cured. The fibrous material must have sufficient void space to allow the Portland cement slurry to penetrate the fibrous material and bond it to the center layer. Typical glass fiber meshes used are 18 x 14 or 21 x 12 meshes per inch. Also,
Strong fiber materials such as nylon filaments or vinyl-coated polyester yarn webs can also be used.

Although a variety of hydraulic cements can be used, the preferred embodiment of the invention uses Portland cement. As the aggregate, general lightweight aggregates such as expanded siere, expanded clay, expanded slag, volcanic ash, and cellular ceramic spheres can be used.
Expanded Cierre appears to have optimal properties for the panels described herein.

Although the lift table 31 is illustrated as a hydraulic lift, this is by way of example only. A scissor table or other device may be used as long as it can be raised and lowered to receive the panel.

In stacking operations, a pallet board 33, a flat sheet or plate of plastic, wood, or metal, is placed on top of the lifting table 31 to provide a flat support. After the desired number of panels have been stacked, the lifting table is taken out and lowered to the height of the conveyor, forklift, etc.
The stacked panels are transferred together with the pallet board 33 by rollers 32, 32, .
When the panel is cured (after 24 hours, for example), the panel is transported along with the pallet board 33 to a strapping workshop, where the entire panel is turned over and placed on runners or pallets, and then the pallet board 33
The panel is then fixed to the runner or pallet with a band and stored in a warehouse or shipped in this state.

Although the method of the present invention is continuous in that the flow of material and product can be continuous, it can be There may be interruptions in flow.

The orifices 34, 34... on the top surface of each cover 30a, 30b of the air film table are arranged in two or three or more rows, and each row independently
Or they are configured to operate all at once.
These rows provide a means of controlling the speed of the panels as they are fed into the air film table. The forward movement of the panel can be controlled by adjusting the amount of air supplied to each row of orifices to reduce the flow rate in a given section. That is, braking action is obtained by reducing the air film on the underside of the panel. For example, by reducing the amount of air on the side of each cover closer to rail 35b than on the opposite row, the forward motion of the panel will be slower. Additionally, the air supply to all orifices is maintained at a normal level until the panel is almost completely pumped, at which point the air supply is stopped to stop the forward motion of the panel. You can also do that. After that,
The supply of air to the orifices 34, 34, . . . is restarted for the stacking operation.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing a preferred embodiment of the device according to the invention, FIG. 2 is a perspective view showing the operation of the air floating stacking device according to the invention, and FIG.
This figure is a perspective view showing a part of the air frame in the stacking device of FIG. 2, and FIG. 4 is a sectional view taken along line 4--4 of FIG. 3. 1: Continuous conveyor belt, 2: Belt roller,
3: table roll, 4: side rail, 5: carrier material web, 6: reinforcing fiber material web,
7: Spretzdarol, 8: Nitsprol, 9:
Transfer roll, 10: Portland cement slurry, 11: Shute, 12: Distributor wheel, 13: Compaction roller, 14:
Reciprocating screed, 15: web of reinforcing fiber material, 1
7: Nitzprol, 18: Transfer roll, 19: Portland cement slurry, 2
0: Concrete strip, 21: Reciprocating cutter, 2
2: Air film transfer table, 23: Cutting table or block, 23a: Recess, 24: Orifice, 25:
Conveyor belt, 26: Roller, 27: Air flotation device, 28: Panel, 29: Air frame, 29
a: opening, 30a, 30b: sliding cover, 3
1: Adjustment lifting table, 32: Roller, 33: Pallet plate, 34: Orifice, 35a, 35b:
Rail, 36: Orifice, 37: Orifice,
38: Orifice, 39: Full, 41: Manifold.

Claims (1)

[Claims] 1. A web of disposable carrier material is laid on a moving conveyor belt, an uncured fiber-reinforced concrete strip is formed on the web of carrier material, and the strip is cut together with the web. Transfer each panel one by one onto the sliding cover of an air frame placed above the adjustable lifting table.The air frame has an opening slightly larger than the dimensions of the panel and a a substantially enclosed space on the side and forming an air cushion in the space, and lowering the panel into the space through the opening by removing the support provided by the sliding cover from the underside of the panel. At the same time, an air cushion is formed in the space, and the air cushion supports the panel substantially horizontally so as to prevent the panel from warping or sagging when the panel is lowered to the adjustment lifting table during stacking of the panel, Furthermore, a method for manufacturing a fiber reinforced concrete panel, characterized by curing the stacked panels in this manner. 2. In forming the air cushion, a high flow rate of low pressure air is sent into the space below the opening in the air frame from an orifice provided on the inner wall of the air frame. Method for producing fiber reinforced concrete panels as described in Section 1. 3. The sliding cover is divided into two members, and pressurized air is sent to the lower side of the panel from orifices provided on opposing inner end surfaces of each member. manufacturing method for fiber-reinforced concrete panels. 4. The method of manufacturing a fiber-reinforced concrete panel according to claim 1, characterized in that pressurized air is sent under the sliding cover to reduce escape of the air cushion. 5. The method for producing a fiber-reinforced concrete panel according to claim 1, characterized in that the fiber-reinforced concrete strip is supported by an air film transfer table when the fiber-reinforced concrete strip is cut into panels. 6 Lay a web of disposable carrier material on the conveyor belt, and on the web of carrier material, a web of reinforcing fiber material, a layer of hydraulic cement slurry, a layer of lightweight aggregate,
Forming a strip of fiber-concrete composite by successively overlaying a center layer mixture of hydraulic cement and water, a web of reinforcing fiber material, and a layer of hydraulic cement slurry; The material web is cut into individual panels, and each panel is sequentially transferred to an air flotation stacking device equipped with an adjustable lift table below to support the panels, the air flotation stacking device having a sliding cover for the air frame. The air frame is provided with an opening slightly larger than the dimensions of the panel and a substantially sealed space below the opening, and an air cushion is formed within the space, and the sliding cover is installed under the panel. by forming an air cushion on the underside of the panel within said space to prevent warping of the panel as it enters said space through said opening for stacking the panels on said adjustable lift table. 1. A method for producing fiber reinforced concrete panels, characterized in that the panels are cured in a stacked manner separated from each other by a layer of said disposable carrier material. 7. The method for producing a fiber-reinforced concrete panel according to claim 6, characterized in that the fiber-reinforced concrete strip is supported by an air film transfer table when the fiber-reinforced concrete strip is cut into panels. 8. A forming section consisting of a continuous conveyor belt, means for laying a web of disposable carrier material on the belt, and means for laying an uncured fiber-reinforced concrete strip on the web of carrier material; a cutting section comprising an air film transfer table and a cutting member disposed above the air film transfer table to cut a panel of a predetermined length from the strip; a continuous conveyor belt and air adjacent to the belt; It has a panel transfer section consisting of a flotation device, an adjustment lifting table, and an air frame disposed above the table, and the air frame has the same shape as the panel and has a length and width slightly larger than the panel. The air frame includes a plurality of walls defining a large space and an opening, and the air frame further includes a segmented sliding cover above the opening for receiving panels one by one from the panel transfer section. a stacking device consisting of a stacking device; a means for lowering the panel onto the adjustment lifting table by sliding the sliding cover open; and a means for lowering the panel onto the adjustment lifting table by sliding it open; air orifice means disposed inside said air frame communicating with said space so as to form an air cushion on the underside of each panel to support the panels substantially horizontally without sagging; and fiber reinforced concrete comprising: Panel manufacturing equipment. 9. The fiber-reinforced concrete panel manufacturing apparatus according to claim 8, wherein the wall portion of the air frame is provided with a rail at each end to serve as a guide for the sliding cover. 10. The apparatus for manufacturing a fiber reinforced concrete panel according to claim 9, wherein the air orifice means includes a plurality of air orifices arranged on each rail of the air frame. 11 Attach inner baffles along the longitudinal direction of at least one wall that limits the space of the air frame, each buffle being attached to an end face of a pallet plate of the adjustable lifting table or an end face of a panel on the adjusting lifting table. 9. The apparatus for manufacturing a fiber-reinforced concrete panel according to claim 8, wherein the apparatus is arranged at a position where they abut each other. 12 The forming section comprises a continuous conveyor belt, means for laying a web of disposable carrier material on the belt, a web of reinforcing fiber material, a layer of Portland cement slurry and a lightweight concrete core on the web of carrier material. A means for successively overlapping layers of a layer mixture, a web of reinforcing fiber material, and a layer of Portland cement slurry to form a strip of fiber-concrete composite. 9. The apparatus for manufacturing a fiber reinforced concrete panel according to item 8. 13 The stacking device has an adjustment lifting table for stacking soft flat plates made of fiber-reinforced concrete, and an air frame disposed above the table, and the air frame includes the flat plates that are lowered onto the adjustment lifting table. A plurality of walls are provided to limit the space through which the air frame passes, and the space within the air frame has a shape that corresponds to the flat body and is slightly larger in size than the flat body so as to allow the passage of the flat body. A sliding cover is arranged above the opening leading to the space to receive the flat objects one by one from the conveyor device, and the sliding cover has two parts that slide to open and close with respect to the opening. Furthermore, an air orifice is arranged inside the air frame communicating with the space to form an air cushion under each flat body almost simultaneously with the operation of each sliding cover, so that the flat body The fiber-reinforced concrete panel according to claim 8, characterized in that the air cushion supports the flat plate substantially horizontally without warping or sagging when lowering to the adjustment lifting table. Manufacturing equipment.