KR101618278B1 - Apparatus for supplying reinforcing fiber to concrete in centrifugal forming process for manufacturing concrete pipe - Google Patents

Abstract

The reinforcing fiber supplying apparatus according to the present invention has an advantage that the reinforcing fiber can be efficiently sprayed on the concrete under centrifugal molding in order to manufacture a concrete pipe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus for supplying reinforcing fibers to a concrete undergoing centrifugal molding for manufacturing a concrete pipe,

The present invention relates to a reinforcing fiber supplying device, and more particularly, to a device capable of efficiently spraying reinforcing fibers to concrete under centrifugal molding in order to produce a concrete pipe.

Generally, a centrifugal force concrete pipe is made by injecting concrete into a mold while rotating the mold.

In this centrifugal force concrete pipe, reinforcing bars are mostly used for reinforcing the strength, so the fracture strength by compressive force is produced above the KS standard value. However, since the crack strength of the centrifugal force concrete pipe is hard to satisfy the KS standard value and the tensile strength of the concrete is low, the reinforcing fiber is mixed with the concrete to solve this problem.

The centrifugal force concrete pipe is produced through sequential treatment of raw material stocking, material weighing, concrete material mixing, mold rotation, conveying and inputting of concrete, curing and demolding process. The reinforcing fiber is mixed in concrete in the concrete material mixing process After that, it is poured into the mold together with concrete.

On the other hand, when the concrete pipe is broken, it is preferable that the reinforcing fiber is disposed at a depth close to the inner surface of the pipe or the inner surface of the pipe because cracks start at the inner surface of the pipe.

However, when the concrete pipe is centrifugally molded by the above-mentioned method, the reinforcing fibers are arranged evenly throughout the thickness of the concrete pipe or are disposed on the inside or outside of the concrete pipe due to the difference in specific gravity. Such arrangement of the reinforcing fibers is, There is a problem that the rise is very low, and when a large amount is put in order to solve such a problem, the cost increases.

When the reinforcing fiber is mixed with the concrete in the concrete material mixing process or the concrete conveying process, abrasion and breakage are caused by friction with the aggregate. In the centrifugal molding, the reinforcing fibers There is a problem that the strength and the property are greatly damaged and the function thereof is greatly deteriorated.

The present invention has been proposed in order to solve the above problems. It is an object of the present invention to provide a reinforced fiber supply device capable of uniformly distributing reinforcing fibers in concrete after concrete is charged into a mold in a centrifugal molding process of a concrete pipe It has its purpose.

It is still another object of the present invention to provide a reinforcing fiber supplying device capable of preventing backflow of reinforcing fibers when conveying reinforcing fibers using compressed air.

It is still another object of the present invention to provide a reinforcing fiber supply device having means for uniformly spreading reinforcing fibers in concrete inside a mold.

It is still another object of the present invention to provide a reinforcing fiber supplying device capable of supplying reinforcing fibers to a plurality of centrifugal molding molds using one reinforcing fiber supplying device.

It is still another object of the present invention to provide a reinforcing fiber feeding device capable of preventing damage of reinforcing fibers generated during concrete mixing and / or feeding and conveying.

In order to solve the above problems, a reinforcing fiber supplying device according to the present invention comprises: a storage part (10) for storing reinforcing fibers (1); A supply regulator for discharging the reinforcing fibers 1 moved from the storage part 10 to the conveyance pipe; And a compressed air supply unit (36) for supplying compressed air to the conveyance pipe for conveying the reinforcing fibers (1) injected into the conveyance pipe.

The reinforcing fibers (1) discharged to the conveying pipe by the supply regulating portion are conveyed inside the conveying pipe by compressed air and then discharged to the outside. Then, after the concrete is put into the mold in the centrifugal molding for making the concrete pipe, the reinforcing fiber (1) is sprayed on the concrete in the mold.

The supply regulator may include a connection tube 30 and a rotary vane 33. The reinforcing fibers 1 flow into the upper end of the connecting pipe 30 and the reinforcing fibers 1 are discharged into the conveying pipe 37 at the lower end of the connecting pipe 30.

The rotary vane 33 is installed at the lower end of the connection pipe 30. [ The rotating blade 33 is rotated by the flow of the compressed air or rotated by a separate driving motor so that the rotation of the rotating blade 33 prevents the reinforcing fiber 1 from flowing back upward.

As a variation on the above configuration of the supply regulator, the supply regulator may include a connection tube 70. The reinforcing fibers 1 are introduced into the connecting pipe 70 at the upper end of the connecting pipe 70 and the reinforcing fibers 1 are discharged into the conveying pipe 77 at the lower end 74 of the connecting pipe 70. The reinforcing fiber 1 discharged from the lower end 74 of the connecting pipe 70 is connected to the lower end 74 of the conveying pipe 77. The connecting pipe 70 is formed substantially parallel to the conveying pipe 77, And sucked into the transfer pipe 77 by the compressed air flow. Thereby, the backflow of the reinforcing fibers 1 can be prevented.

The supply regulating unit may further include a quantitative supply member 20. The fixed amount supply member 20 moves the reinforcing fibers 1 supplied from the storage unit 10 to the connection pipes 30 and 70 by a predetermined amount.

On the other hand, the reinforcing fibers 1 conveyed through the conveyance pipe are sprayed on the concrete 310 inside the mold via the discharge pipe 47. In order to effectively spray the reinforcing fibers 1, at least a portion of the discharge tube 47 is inserted into the mold.

At the end of the discharge pipe 47, a spraying direction adjusting unit 50 may be installed. The spraying direction adjusting unit 50 may include a support rod 51 provided at an end of the discharge pipe 47 and a flat plate 53 provided at an end of the support rod 51. [ The flat plate 53 may be fixed to the support rod 51 or be rotatable. The reinforcing fibers (1) discharged from the discharge pipe (47) hit the flat plate (53) and are uniformly dispersed and sprayed.

The spray direction regulating portion 50a includes a closed flat plate 49 for sealing the end of the discharge pipe 47 and a closed flat plate 49 formed just in front of the closed flat plate 49. [ And may include openings 48.

The reinforcing fibers 1 conveyed through the discharge pipe 47 collide with the closed flat plate 49 and are discharged downward through the opening portion 48.

On the other hand, a plurality of discharge pipes 47 may be connected to one transfer pipe. The plurality of discharge pipes 47 are for spraying the reinforcing fibers 1 to the concrete in each of the molds 210, 220 and 230 and the discharge pipes 47 for supplying the reinforcing fibers 1 from the plurality of discharge pipes 47 47) can be selected using a selection valve.

The process for spraying the reinforcing fibers 1 onto the concrete 310 of the molds 210, 220 and 230 is as follows.

First, the compressed air supply unit 36 is operated to continuously supply the compressed air to the conveyance pipe, and then the reinforcing fiber is supplied to the concrete 310 of any one of the molds 210, 220, and 230 When the preparation is completed, the quantity supplying member 20 is turned on to supply the reinforcing fiber 1 to the concrete 310 and the supply of the reinforcing fiber 1 to the concrete 310 is completed, (At this time, the compressed air supply section 36 is continuously operated to continuously supply the compressed air), the reinforcing fiber 1 is prepared to be supplied to the concrete of the other mold, and then, when the preparation is completed, The member 20 is turned on to supply the reinforcing fibers 1 to the concrete of the mold.

The reinforcing fiber supply device according to the present invention has the following effects.

First, in the centrifugal molding process of the concrete pipe, after the concrete is put into the mold, the reinforcing fiber can be uniformly sprayed on the concrete in the mold. As a result, the reinforcing fibers are distributed at a depth close to the inner surface or the inner surface of the concrete pipe, thereby enhancing the effect of increasing the strength of the reinforcing fiber relative to the usage amount.

Second, it is possible to prevent the reinforcing fibers from flowing backward when the reinforcing fibers are conveyed by using compressed air.

Third, after the reinforcing fiber is discharged from the discharge pipe, the direction is changed by colliding with the flat plates 53 and 49, so that it is possible to uniformly spray the concrete in the mold.

Fourth, reinforcing fibers can be supplied to a plurality of centrifugal molding molds using a single reinforcing fiber supplying device.

Fifth, it is possible to prevent the reinforcing fibers from being damaged during the concrete mixing process and the input / conveyance.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front view showing a reinforcing fiber supply device according to a preferred embodiment of the present invention; Fig.
Fig. 2 is a left side view showing the reinforcing fiber feeding device of Fig. 1; Fig.
3 is a plan view showing the reinforcing fiber feeding device of Fig.
FIG. 4 is an enlarged cross-sectional view showing a supply control unit and a compressed air supply unit provided in the reinforced fiber supply apparatus of FIG. 1;
5 is a plan view showing a plurality of molds arranged in a centrifuge plant.
6 is a cross-sectional view showing application of reinforcing fibers to the concrete of the mold during centrifugal molding using the reinforcing fiber feeding device of Fig.
FIG. 7 (a) is a front view showing a spray direction adjusting unit provided in the reinforcing fiber supplying device of FIG. 1;
7 (b) is a right side view showing the spray direction regulating portion of Fig. 7 (a).
8 (a) is a front view showing a modified example of the spray direction regulating portion.
8 (b) is a right side view showing the spray direction regulating portion of Fig. 8 (a).
9 is an enlarged cross-sectional view showing a modification of the supply regulating portion and a compressed air supply portion.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely examples of the present invention and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

FIG. 1 is a front view showing a reinforcing fiber supplying apparatus according to a preferred embodiment of the present invention, FIG. 2 is a left side view showing the reinforcing fiber supplying apparatus, and FIG. 3 is a plan view showing the reinforcing fiber supplying apparatus.

Referring to FIG. 1, a reinforcing fiber supplying apparatus includes a storing unit 10 for storing reinforcing fibers 1, a supply adjusting unit 30 for discharging the reinforcing fibers 1 supplied from the storing unit 10 to a transferring pipe 37, (30), and a compressed air supply unit (36) for supplying compressed air to the transfer pipe (37).

The storage unit 10 has a space for storing the reinforcing fibers 1 therein. An inlet 12 is formed at the upper end of the storage unit 10 and an outlet is formed at the lower end of the storage unit 10. The reinforcing fibers 1 are inserted into the internal storage space through the inlet port 12 and then discharged to the supply regulating section 30 through the outlet port. As the storage unit 10, a hopper or the like may be used. The storage unit 10 is supported by a frame. Examples of the reinforcing fiber 1 used in the present invention include GRC (glass fiber), CFRC (carbon fiber), and PFRC (synthetic fiber). Reinforcing fiber is currently used mainly in precast concrete, and it has been attracting attention as a new building material and is being developed as a structural material.

The frame includes upper and lower frames 11 and 13 and a lower frame 14 provided under the upper frames 11 and 13.

The upper frames 11 and 13 include four pillars 11 provided on the upper surface of the lower frame 14 and a horizontal support 13 arranged to connect the pillars 11 to each other. The four pillars 11 support the load of the storage part 10 and the horizontal support 13 supports the quantitative supply member 20. Therefore, the load of the storage part 10 and the fixed amount supply member 20 is transmitted to the lower frame 14 through the column 11. [

A load cell 16 may be provided between the lower end of the four pillars 11 and the lower frame 14. By using a change in load shown by the load cell 16, The weight of the fiber 1 can be known. That is, when the load changes shown by the load cells 16 installed at the lower ends of the four columns 11 are summed together, the weight of the reinforcing fibers 1 supplied to the connecting pipe 30 can be known, 1) can be adjusted.

The supply control section includes a fixed amount supply member 20, a connection pipe 30 into which the reinforcing fibers 1 moved from the fixed amount supply member 20 are inserted, and a rotary vane 33 provided at the lower end of the connection pipe 30 .

The dosing member 20 is mounted on a horizontal support 13. The dosing member 20 may include a conveyor belt 21 and a drive motor 23 for driving the conveyor belt 21. [

The conveyor belt 21 moves the driving pulley and the driven pulley on an endless track and moves the reinforcing fibers 1 stacked on the upper surface thereof to the connecting pipe 30. [ The conveyor belt 21 is spaced apart from the lower end of the storage unit 10 by a predetermined distance from the discharge port of the storage unit 10. The reinforcing fiber 1 discharged from the storage unit 10 is moved And then introduced into the connector 30.

The drive motor 23 selectively rotates the drive pulley of the conveyor belt 21. When the load change sensed by the load cell 16 reaches a predetermined reference value, the drive motor 23 is stopped to stop the supply of the reinforcing fibers 1. [

That is, when the driving motor 23 is operated and the reinforcing fiber 1 is inserted into the connecting pipe 30, the load acting on the load cell 16 is reduced by the weight of the inserted reinforcing fiber 1, When the weight of the reinforcing fiber 1 used for one concrete pipe reaches the predetermined standard value, for example, the supply of the reinforcing fiber 1 is stopped by stopping the drive motor 23, and then the reinforcing fiber 1 is reinforced to another concrete pipe When the preparation is completed, the driving motor 23 is operated again to supply the reinforcing fibers 1 to the connecting pipe 30. [

The connection pipe 30 is installed at one end of the conveyor belt 21 and the rotary vane 33 is installed at the lower end of the connection pipe 30. [ 2 and 4, the compressed air supply unit 36 is installed on the upper surface of the lower frame 14, and the compressed air supplied by the compressed air supply unit 36 is discharged to the transfer pipe 37 . The load of the connecting pipe 30, the rotary vane 33, the compressed air supply unit 36 and the transfer pipe 37 is transmitted to the lower frame 14 and not to the upper frames 11 and 13.

The connecting pipe 30 is a pipe for moving the reinforcing fiber 1 moved by the conveyor belt 21 to the conveying pipe 37. The reinforcing fibers 1 are injected through the upper end 39 of the connecting pipe 30 and then discharged through the lower end of the connecting pipe 30 to the conveying pipe 37. And the lower end is in communication with the transfer pipe 37.

The connection tube 30 is formed in a cylindrical shape in the vicinity of the lower end while decreasing its width from the upper end to the lower end. This prevents the reinforcing fiber 1 from flowing back upward by the compressed air, In order to provide a space that can be used.

The rotary blade 33 is installed at the lower end of the connection pipe 30 so as to be rotatable about the rotary shaft 34. The rotary blade 33 is connected to the reinforcing fiber 1 by the compressed air flowing inside the transfer pipe 37, To prevent upward flow backward.

When the rotary blade 33 is rotated counterclockwise (in the direction of the arrow in FIG. 4) by the air stream of the compressed air, the reinforcing fibers 1 moved from the upper side are rotated together with the wings while being accommodated between the blades, 30 to the transfer pipe 37 at the lower end thereof.

It is preferable that the rotary vane 33 is installed such that a part of the vane flows into the transfer tube 37 during rotation so that the rotary vane 33 is smoothly rotated by the flow of the compressed air.

The rotary blades 33 may be rotated by the flow of compressed air, but may be rotated by a separate motor (not shown).

The compressed air supply unit (36) supplies compressed air to the transfer pipe (37). The compressed air moves the reinforcing fiber (1) while flowing inside the transfer pipe (37). As the compressed air supply unit 36, a blower may be used, but a compressed air storage tank (not shown in the figure) may be used.

2 and 3, the conveying pipe 37 is a pipe for conveying the reinforcing fibers 1 discharged from the connecting pipe 30, and a compressed air supply unit 36 is provided at the rear end thereof, A distribution pipe 43 is connected. The distribution pipe 43 is connected to the plurality of hoses 45 and each hose 45 is connected to the discharge pipe 47.

Selection valves 41 and 42 may be provided at the connection point between the transfer pipe 37 and the distribution pipe 43 and at the connection point between the distribution pipe 43 and the hose 45. The selection valve 41 42 are used to select the tube to which the reinforcing fibers 1 are to be fed. Three-way valves can be used as the selection valves 41 and 42, and the opening and closing of the valves can be performed manually or remotely.

The structure in which one conveyance pipe 37 is connected to the plurality of hoses 45 and the discharge pipe 47 allows one reinforcing fiber supply device to supply reinforcing fibers to a plurality of concrete pipes. For example, when only the selection valves 41 and 42 are switched after the supply of the reinforcing fibers to the concrete pipe is completed, the reinforcing fibers can be supplied to the other concrete pipes.

5, there are many molds 210, 220, and 230 in a general centrifugal molding area, and a plurality of molds 210, 220, and 230 are often operated at the same time. The configuration is effective for supplying the reinforcing fibers 1 to the plurality of molds 210, 220 and 230. Meanwhile, as is well known, the centrifugal molding is performed by rotating the molds 210, 220, and 230 by rotating the rotating table 200 after the molds 210, 220 and 230 are mounted on the rotating table 200 And the molds 210, 220, and 230 are rotated, the concrete 310 is injected into the mold to make a concrete pipe using the centrifugal force.

As the hose 45, a flexible pipe may be used. The flexible pipe is useful for moving the discharge pipe 47 and changing the direction.

The discharge pipe 47 sprays the reinforcing fibers 1 moved through the hose 45 onto the concrete 310 inside the mold 210 as shown in Fig.

As described above, according to the present invention, after the concrete is put into the mold 210 in the centrifugal molding for making the concrete pipe, the reinforcing fiber 1 is sprayed on the concrete in the mold. Therefore, the discharge pipe 47 is provided with at least a part of the reinforcing fiber 1 in the state of being inserted into the mold 210, and the discharge pipe 47 is arranged in the longitudinal direction of the concrete pipe, It may be moved.

The reinforcing fiber 1 is sprayed in a state in which the mold 210 is rotated. Since the concrete is already poured and is sprayed after the concrete is positioned, the reinforcing fiber 1 is sprayed on the inner surface or the inner surface of the concrete pipe It is mainly distributed at close depths, and this distribution is very effective in improving the strength (or crack prevention) of concrete.

On the other hand, a spraying direction adjusting unit 50 may be provided at the end of the discharge pipe 47. 7A and 7B, the spray direction regulating portion 50 may include a support rod 51 provided at an end of the discharge pipe 47 and a flat plate 53 provided on the support rod 51. [

The flat plate 53 may be fixed to the end of the support rod 51 or may be installed to be rotatable about the shaft 55 by compressed air. The distance L1 between the end of the discharge pipe 47 and the flat plate 53 is preferably 20 mm to 100 mm.

The reinforcing fibers (1) discharged from the discharge pipe (47) hit the flat plate (53) and are uniformly dispersed and sprayed. The flat plate 53 is preferably a circular plate, but is not limited thereto.

8A and 8B show a variation of the spray direction regulating portion. The spray direction regulating portion 50a includes a closed flat plate 49 provided at the end of the discharge pipe 47 and an opening portion 48 formed by cutting a part of the discharge pipe 47.

The opening 48 is made by cutting the lower portion of the discharge pipe 47 just in front of the closed flat plate 49. The length L2 of the opening 48 is preferably 20 mm to 100 mm.

The closed flat plate 49 closes the end of the discharge pipe 47 so that the reinforcing fiber 1 conveyed through the discharge pipe 47 hits the closed flat plate 49 and is discharged downward through the opening 48 .

The closed flat plate 49 is preferably an arc flat plate having a diameter larger than the diameter of the discharge pipe 47. However, the present invention is not limited thereto, and the reinforcing fiber 1 fed through the discharge pipe 47 may be a closed flat plate 49, A closing plate of a different shape may be used as long as it can be ejected downward through the opening 48 after encountering the opening 48. [

9 is an enlarged cross-sectional view showing a modified example of the supply control portion and a compressed air supply portion.

The supply regulator includes a connection tube (70). The connection pipe 70 includes a portion 71 whose width decreases toward the bottom and a portion 73 formed parallel to the transfer pipe 77. The parallel portion 73 is formed on the upstream side of the lower end 74 at a predetermined interval, and the two portions 71 and 73 communicate with each other. Therefore, the reinforcing fibers 1 are injected from the upper end of the connecting pipe 70 and then discharged through the lower portion 74 via the two portions 71 and 73.

An inclined surface 78 is formed in the portion of the conveyance pipe corresponding to the lower end 74. The downstream side of the inclined surface 78 due to the inclined surface 78 has a smaller cross sectional area than the cross sectional area of the cross sectional area of the conveyance pipe and the cross sectional area of the parallel portion 73, So that the reinforcing fibers 1 are sucked out by the conveying pipe 77 so that the reinforcing fibers 1 can be prevented from flowing back up due to the compressed air.

 Hereinafter, the process of supplying the reinforcing fiber 1 to the concrete under centrifugal molding using the reinforcing fiber supplying apparatus according to the present invention will be described.

First, the mold 210 is placed on a rotating table 220, and the concrete 310 is put into the mold 210 while the mold 210 is rotated. When the concrete injection is completed, the compressed air supply unit 36 is operated and the reinforcing fibers 1 are prepared to be sprayed onto the concrete in the mold 210.

When the preparation is completed, the conveyor belt (21) is driven to supply the reinforcing fibers (1) to the connection pipe (30). The reinforcing fibers 1 supplied to the connecting pipe 30 are moved downward and then discharged to the conveying pipe 37 by the rotating blades 33. On the other hand, the rotary vane 33 is rotated by the air flow of the compressed air or another motor, and also serves to prevent the backflow of the reinforcing fiber 1.

The reinforcing fibers 1 discharged to the transfer pipe 37 are conveyed by the flow of the compressed air and are sequentially passed through the distribution pipe 43, the hose 45 and the discharge pipe 47, Of concrete. At this time, the spray direction regulating portions 50 and 50a regulate the spraying direction of the reinforcing fiber 1.

The supply of the reinforcing fibers 1 is stopped by stopping the driving motor 23 when the reinforcing fiber application into the mold 210 is completed do). Whether or not the spraying of the reinforcing fiber 1 has been completed can be performed only when the change in the load indicated by the load cell 16 is detected. When the load change reaches the reference value, an alarm or an electric light (not shown in the figure) It is preferable to inform the user.

Subsequently, the reinforcing fibers 1 are supplied to the concrete in the other molds 220 and 230. When the preparation is completed, the driving motor 23 is operated to supply the reinforcing fibers 1, The driving motor 23 is stopped and the supply of the reinforcing fibers 1 is stopped.

By repeating this process, the reinforcing fibers 1 can be sprayed on the concrete of the plurality of molds 210, 220 and 230.

1: reinforcing fiber 10: storage part
16: load cell 20: constant amount feeding member
21: conveyor belt 23: drive motor
30, 70: connection pipe 33: rotary wing
34: rotating shaft 36: compressed air supply part
37, 77: transfer pipe 41, 42: selection valve
43: Distribution pipe 45: Hose
47: discharge pipe 50, 50a:
200: Swivel 210, 220, 230: Mold

Claims (9)

(a) mounting the mold 210 on the turntable 220;
(b) injecting the concrete 310 into the mold 210 while rotating the mold 210; And
(c) spraying the reinforcing fibers (1) onto the concrete inside the mold (210) while the mold (210) is rotating,
In the step (c), the reinforcing fibers 1 are spread while being conveyed in the longitudinal direction of the concrete pipe or vertically or horizontally, so that the reinforcing fibers 1 are uniformly sprayed on the concrete,
Characterized in that the application of the reinforcing fibers (1) is carried out after the concretes are completely filled, whereby the reinforcing fibers (1) are distributed at a close depth in the inner surface or the inner surface of the concrete pipe Method of supplying fiber. The method according to claim 1,
In the step (c), the reinforcing fibers 1 are fed by the constant amount feeding member 20,
The quantitative supply member 20,
Conveyor belt 21; And
And a drive motor (23) for driving the conveyor belt (21)
The conveyor belt 21 moves the reinforcing fibers 1 by a predetermined amount to the connecting pipes 30 and 70,
The load cell 16 senses the load of the reinforcing fiber 1 supplied by the fixed amount supply member 20 and stops the operation of the driving motor 23 when the load reaches a predetermined reference value, Wherein the supply of reinforcing fibers is stopped when the centrifugal force concrete pipe is manufactured. A storage unit (10) for storing the reinforcing fibers (1);
A supply regulator for discharging the reinforcing fibers 1 moved from the storage part 10 to the conveyance pipe; And
And a compressed air supply unit (36) for supplying compressed air to the conveyance pipe for conveying the reinforcing fibers (1) injected into the conveyance pipe,
The reinforcing fiber (1) discharged to the conveyance pipe by the supply regulating portion is conveyed inside the conveyance pipe by compressed air and then discharged to the outside,
After the concrete is put into the mold in the centrifugal molding for making the concrete pipe, the reinforcing fiber (1) is sprayed on the concrete in the mold,
The reinforcing fibers 1 conveyed through the conveyance pipe are discharged to the concrete 310 inside the mold through the discharge pipe 47. A plurality of discharge pipes 47 are connected to one conveyance pipe,
The plurality of discharge pipes 47 are for spraying the reinforcing fibers 1 to the concrete in each of the molds 210, 220 and 230 and the discharge pipes 47 for supplying the reinforcing fibers 1 from the plurality of discharge pipes 47 47) is selected using a selection valve,
The supply regulating portion includes a constant amount supply member (20)
The fixed amount supplying member 20 moves the reinforcing fibers 1 supplied from the storing portion 10 by a predetermined amount to the connecting pipes 30 and 70,
The compressed air supply unit 36 is operated to continuously supply the compressed air to the conveyance pipe and then ready to supply the reinforcing fibers to the concrete 310 of any one of the molds 210, 220 and 230 After the completion of the supply of the reinforcing fibers 1 to the concrete 310, the fixed amount supplying member 20 is turned on to supply the reinforcing fibers 1 to the concrete 310, the reinforcing fibers 1 are supplied to the concrete of the other molds and then the quantity supplying member 20 is turned on when the preparation is completed. Wherein the reinforcing fiber supplying device supplies the reinforcing fiber.

delete delete delete delete delete delete

Images