JPS5814285B2 - Feeding method and equipment for reinforcing fiber premix mortar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for supplying a reinforcing fiber premix mortar, in which mortar in which cement, sand, water, and reinforcing fibers such as glass fibers are kneaded in advance (premix) is supplied to a formwork or the like. , regarding the equipment directly used for its implementation.

Concrete products generally have high compressive strength, but low tensile and bending strength, and do not have sufficient tensile strength. In products that require high strength or bending strength, glass fibers are included for reinforcement.

As methods for this, the direct spray method and the premix method are conventionally well known.

In the direct spray method, mortar, which is a mixture of cement, sand, and water, is pumped and sprayed onto the formwork surface using a spray gun. At the same time, the roping glass fibers are cut to a predetermined length using a roving cutter. This method involves cutting the mortar into pieces and spraying it overlapping the spray pattern of the mortar.

However, in this method, the spraying of mortar and glass fiber onto the formwork using a spray gun and a pin cutter is mainly done manually, which limits the size of the objects used and requires skill. Therefore,
The drawback is that productivity is very low.

Further, due to the characteristics of this manufacturing method, the products that can be manufactured are limited to those with simple shapes such as a plate shape, and various additional processing is required when trying to manufacture products with somewhat complex shapes.

Furthermore, mortar pumps and roving cutters require a lot of maintenance, and when cutting glass fibers with the roping cutter, there are many problems in industrial manufacturing, such as scattering of powder chips and creating a poor working environment. .

On the other hand, in the premix method, the mortar and glass fibers are kneaded in advance and poured into the mold, and although it does not have the above-mentioned drawbacks of the direct spray method, it does cause the glass fibers to become oriented in a so-called three-dimensional random orientation due to cross-contact. However, some of the glass fibers do not have any reinforcing effect against tensile force and bending force, so the reinforcing effect of incorporating glass fibers is significantly inferior to that of the direct spray method, and in reality, At present, it has not been put into practical use.

The present invention belongs to the premix method, but all of the reinforcing fibers that have been kneaded in advance and are in a three-dimensional randomly oriented state are converted into two-dimensional fibers that can be reinforced against tensile force and bending force. A product that can be oriented in a randomly oriented state, and can be done efficiently and without damaging reinforcing fibers when being fed to a mold, etc., thereby eliminating the above-mentioned drawbacks of the premix method. It is.

The feature is that mortar, which is made by mixing cement, sand, water, and reinforcing fibers such as glass fibers, is deposited in a mortar container and on a conveyor, and the deposited mortar is transferred to the conveyor. Therefore, the thickness of mortar is limited and the mortar is continuously fed out in strips from the mortar container, and the top surface of the mortar strips is repeatedly hammered to make it smooth and gradually thinned before being continuously fed into formwork, etc. This is what I did.

The invention will now be described in detail with reference to the accompanying drawings.

First, the outline of the present invention will be explained with reference to FIG. 1. A belt conveyor 2 is placed horizontally under a mortar container (hopper) 1 which has both upper and lower surfaces open so as to close the lower opening of the mortar container 1. arranged,
When a reinforcing fiber premix mortar, i.e., mortar M, which is made by mixing cement, sand, water, and shredded glass fibers, is introduced into the mortar container 1 through its upper opening, the mortar M is transferred onto the belt conveyor 2 into the mortar container 1. It is designed to be deposited and stored in

The belt conveyor 2 has a belt 4 between the front and rear pulleys 3, 3.
The pulley 3 on the rear side is connected to a conveyor drive motor 8 whose speed can be adjusted via a sprocket wheel 5, a chain 6, and a sprocket wheel 7.The belt 4 is moved in the direction of the arrow by the drive of the motor 8. It moves in a circular motion.

The lower edge of the front wall 1a of the mortar container 1 maintains a predetermined distance from the belt 4 to form a horizontally long mortar outlet 9.

When the belt 4 circulates in the direction of the arrow, the mortar M accumulated in the mortar container 1 is removed from the mortar outlet 9.
It is automatically fed out in a continuous strip.

A thickness adjuster 10 is attached to the outside of the front wall 1a of the mortar container 1 so that the thickness of the mortar fed out in a band shape can be adjusted.

This thickness adjuster 10 has a horizontally long shielding plate 13 made of a flexible material such as rubber attached to the lower end of a piston rod 12 of an inverted hydraulic or pneumatic cylinder 11. The moment the mortar exits the mortar outlet 9, its thickness is restricted, and the belt-shaped mortar M' whose thickness is roughly adjusted is transferred forward by the belt 4.

The thickness of this band-shaped mortar M' can be adjusted by vertically adjusting the position of the shielding plate 13 using the cylinder 11.

In addition, since the shielding plate 13 is made of a flexible material and curves in the direction of conveyance of the strip-shaped mortar M', the glass fibers, which are vertically randomly oriented, are gradually turned sideways, especially in the middle part in the thickness direction of the strip-shaped mortar V. to the horizontal random orientation without damage.

Band-shaped mortar M whose thickness has been roughly adjusted by the thickness adjuster 10
When transported to the front end of the belt conveyor 2, the upper surface of the sheet is smoothed by the smoother 14 in the following manner.

That is, in the smoother 14, a link 17, which together with the smoother constitutes a disk crank, is pivotally attached to an eccentric position of a disk 16 rotated by a smoothing motor 15.
and a horizontally long hitting plate 18 made of an elastic material such as rubber are connected via a slide shaft 19, and the motor 15
When driven, the striking plate 18 repeatedly moves up and down to strike the upper surface of the strip-shaped mortar M'.

By this beating, the band-shaped mortar M' is cut into thin pieces, the unevenness of the upper surface is smoothed out, and the glass fibers contained in the band-shaped mortar M' are in a vertical Randall orientation state. Due to this action, most of the glass fibers are turned sideways and become horizontally randomly oriented.

Note that it is more effective if a plurality of smoothers 4 are installed at required intervals in the flow direction of the strip mortar M' and the strip mortar M' is hammered out in multiple stages.

The strip-shaped mortar M'' smoothed in this way transfers onto the vibration guide plate 20, which is disposed so as to be inclined downward from the front end of the belt conveyor 2, and is vibrated by the vibration guide plate 20. It flows along its upper surface.

The vibration guide plate 20 is vibrated by a vibrator 21 attached to its lower side.

As a result, the band-shaped mortar M" flowing while vibrating on the vibration guide plate 20 gradually becomes smoother and thinner, so that all of the glass fibers contained therein become two-dimensionally randomly oriented. In addition, the viscosity increases as a whole, and finally all the glass fibers are in a two-dimensional randomly oriented state.A very thin and highly viscous strip-shaped mortar M.
' and falls into the mold 22, where it is cured so as to maintain a two-dimensional random orientation state.

In the method of the present invention, the mortar M deposited in the mortar container 1 is finally turned into such strip-shaped mortar M# and is continuously supplied to the formwork 22. The apparatus will be explained with reference to FIGS. 2 to 4.

The belt conveyor 2 and the vibration guide plate 20 are attached to a conveyor frame 23 (FIG. 2) installed on the lower side of the mortar container 1, and the smoother 14 is installed on the front side of the mortar container 1. It is attached to the smoother frame 24 (FIG. 4) as will be described later.

The mortar container 1 is connected to chains 25 at four locations on the left, right, front, and back.
. The position can be adjusted.

That is, the chains 25 . . . each have a sprocket wheel 28 . 29, the mortar container 1 is connected to a weight 31 that slides up and down along a vertically long guide rail 30, and the motor 27 is connected to a gear 3.
2.33, 34.35 to the common shaft 36 of the sprocket wheel 29, the mortar container 1 is raised or lowered by forward or reverse rotation of the motor 27, and the belt conveyor 2, The thickness adjuster 10, smoother 14, and vibration guide plate 20 move up or down, and their vertical positions can be adjusted together.

The horizontal movement frame 26 is driven by horizontal movement motors 37, 37 which are mounted at the front and rear of the frame and can be reversed in forward and backward directions, so that the wheels run horizontally on the front and rear movement frame 38 to the left or right. There is.

The longitudinally moving frame 38 is driven by a longitudinally moving motor 39 mounted on its rear end and capable of forward and reverse rotation, so that its wheels run horizontally forward or backward on the left and right construction rails 40, 40.

The thickness adjuster 10 mentioned above, as shown in detail in FIG.
The upper end of the cylinder 11 is pivotally connected to a bracket 41 protruding from the front wall of the mortar container 1, and the piston rod 1 is
A sliding plate 42 that slides up and down along the outer surface of the front wall 1a is connected to the lower end of 2, and a shielding plate 13 is attached to the lower end of this sliding plate 42.

The smoother 14 described above has a motor 14 connected to the smoother frame 24.
A disk 16 is fitted onto the shaft of the motor 14, a link 17 is pivotally connected to the disk 16 with a pin 43, and a slide shaft 19 passes through the guide tube 44 so as to be vertically slidable. are connected by a pin 45, and a striking plate 18 is connected to the lower end of this slide shaft 19.

The lower side surface of this striking plate 18 is rounded so as not to damage glass or fibers.

The vibration guide plate 20 is attached to the shaft 4 on the conveyor frame 23.
6, the shaft 4 is
It is supported in the same way on both the left and right sides so that it can tilt around 6.

The arms 47, 47 are connected to a piston rod 50 of a hydraulic or pneumatic cylinder 49 pivotally connected to the conveyor frame 23 via a link 48 which together forms a bell crank.

Therefore, the vibration guide 7 plate 20 is moved by the operation of the cylinder 49.
The angle can be adjusted by tilting.

The vibration guide plate 20 itself has a gutter shape with left and right side plates 52, 52 on both left and right sides of a bottom plate 51, and one end of the bottom plate 51 is
The upper side of the front pulley 3 is substantially in contact with the upper surface of the belt 4.

This vibration guide plate 20 can be connected to the same gutter-shaped connection guide plate 53.

As mentioned above, the mortar container 1, the belt conveyor 2, the thickness adjuster 10, and the smoother 14 shown in a simplified diagram in FIG.
The vibration guide plates 20 and 20 can be vertically adjusted and can also be moved back and forth and left and right.The mold 22 is filled with mortar by adjusting their vertical positions and then moving them back and forth. This is done by changing the position to the left or right.

The conveyance speed of the strip mortar M' by the belt conveyor 2 can be adjusted by adjusting the speed of the motor 8, and the thickness of the strip mortar M' can be adjusted by adjusting the vertical position of the shielding plate 13 using the cylinder 11. The hitting period of the hitting plate 18 can be adjusted by changing the rotational speed of the motor 15, and the inclination angle of the vibration guide plate 20 can be adjusted by changing the rotational speed of the motor 15.
Each adjustment can be made by rotating the arms 47 (FIG. 4).

By the way, if the length of glass fiber is about 281t77l,
The thickness of the strip-shaped mortar M' is approximately
70 degrees, and the frequency of the vibrator 21 was set to about 2900 vpm, a thin band-shaped mortar M'' with a thickness of about 15 mm in which the glass fibers were all in a two-dimensional randomly oriented state without damage.
was able to form.

Pour this strip-shaped mortar M'' into the formwork and make a length of 300 mm.
A rectangular plate-shaped concrete specimen with a width of 50 mλ and a thickness of 15 mm was molded, and a concrete specimen of the same size (glass fiber
When compared with mortar that is dimensionally randomly oriented and poured directly into the mold and allowed to harden,
The results were as shown in the table below.

As is clear from this table, the bending strength of the specimens produced by the method of the present invention is much higher than those produced by the conventional method, even though the glass fiber content is lower.

According to experiments, the thickness of the strip-shaped mortar M' sent out from the mortar container 1 was set to 20 to 150 mm, and the thickness was adjusted so that the final thickness was 20 u or less (thickness of the strip-shaped mortar M'''). As a result, glass fibers of a typical length could be oriented from a three-dimensional randomly oriented state to a two-dimensional randomly oriented state with almost no damage.

In the above embodiment, the strip-shaped mortar M" is placed in the formwork 22.
Although the strip-shaped mortar M''' is filled in the concrete in a plurality of layers, a simple plate-shaped concrete product may be made.

Moreover, even if the mortar uses steel fiber, carbon fiber, etc. as the reinforcing fiber, the present invention can be implemented in the same manner as described above.

As is clear from the above, the method of the present invention involves depositing mortar in which cement, sand, water, and reinforcing fibers such as glass fibers are mixed in advance in a mortar container and on a conveyor. As the mortar is conveyed, the thickness of the mortar is limited and the mortar is connected from the mortar container and sent out in the form of a strip.The strip of mortar is then mechanically smoothed and cut into thin pieces to smooth out the irregularities on the top surface. It is used to level the mixture, gradually make it thinner, and then continuously feed it to the formwork, etc.
It is possible to orient all of the reinforcing fibers that are in a dimensional randomly oriented state to a two dimensional randomly oriented state that can provide reinforcement against tensile force and bending force, and to efficiently feed it to formwork etc. Moreover, this can be done without damaging the reinforcing fibers.

Further, according to the apparatus of the present invention, the above method can be carried out effectively and more efficiently.

[Brief explanation of drawings]

Figure 1 is an explanation diagram for explaining the method of the present invention, Figure 2 is a
, 3.4 shows a specific apparatus for implementing the method, FIG. 2 is a partially cutaway side view of the whole, FIG. 3 is a plan view of the whole, and FIG. 4 is a mortar container, FIG. 2 is a partially cutaway side view specifically showing a thickness adjuster, a smoother, and a vibration guide plate in an enlarged manner. 1... Mortar container, 2... Belt conveyor, 10...
Thickness adjuster, 14... smoother, 20... vibration guide plate.

Claims (1)

[Scope of Claims] 1. Mortar in which cement, sand, water, and reinforcing fibers such as glass fibers are mixed in advance is deposited in a mortar container and on a conveyor, and the deposited mortar is transferred to the conveyor. As it is transported, the mortar is continuously sent out in strips from the mortar container with its thickness limited, and the top surface of the mortar strips is repeatedly hammered to make it smooth, and the mortar is gradually thinned and continuously fed to formwork, etc. A method for supplying reinforcing fiber flexible mix mortar. 2. The method for supplying reinforcing fiber premix mortar according to claim 1, characterized in that the upper surface of the strip-shaped mortar is struck with a striking plate made of an elastic material. 3. The method for supplying reinforcing fiber premix mortar according to claim 1, wherein the band-shaped mortar is pounded and then gradually thinned by applying vibration force. 4. Claim 1, characterized in that the band-shaped mortar is supplied to formwork, etc. with a final thickness of 20 mm or less
, 2. A method for supplying reinforcing fiber premix mortar according to any one of items 2 and 3. 5 A mortar container with an open lower surface and a mortar outlet formed at the lower end of the front surface, and reinforcing fiber premix mortar placed under the mortar container so as to close the lower opening of the mortar container, and deposited and mounted in the mortar container. a belt conveyor that continuously sends out mortar in a strip form from the mortar outlet, a thickness adjuster that adjusts the thickness of the strip mortar that is sent out in this way, and a thickness adjuster that adjusts the thickness of the mortar that is transferred by the belt conveyor A smoother is used to repeatedly hammer and smooth the upper surface of the strip-shaped mortar, and a vibration device is used to transfer the strip-shaped mortar smoothed by the smoother from the belt conveyor and guide the flow while giving vibration. A feeding device for reinforcing fiber premix mortar, comprising a guide plate. 6. The reinforcing fiber premix mortar feeding device according to claim 5, which is configured such that the angle of the vibration guide plate can be adjusted. 7. Claim 5 or 6, wherein the vibration guide plate is arranged below the upper surface of the terminal end of the belt conveyor.
A feeding device for reinforcing fiber premix mortar as described in 2. 8. The reinforcing fiber premix mortar supply device according to claim 5, wherein the smoother has a structure in which the upper surface of the band-shaped mortar is repeatedly struck by a striking plate that moves up and down. 9. The reinforcing fiber according to any one of claims 5, 6, 7, and 8, which is equipped with a mortar container, a belt conveyor, a thickness adjuster, a smoother, and a vibration guide plate in a device that moves back and forth. Premix mortar feeding device. 10. The reinforcing fiber according to any one of claims 5, 6, 7, and 8, which is equipped with a mortar container, a belt conveyor, a thickness adjuster, a smoother, and a vibration guide plate in a device that moves laterally. Premix mortar feeding device. 11. The reinforcing fiber preform according to any one of claims 5, 6, γ, and 8, which is equipped with a mortar container, a belt conveyor, a thickness adjuster, a smoother, and a vibration guide plate in a device that moves up and down. Mixed mortar feeding device.