JP2005186443A - Method and apparatus for manufacturing centrifugally molded concrete product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a manufacturing method of a centrifugally molded concrete product constituted so as to easily manufacture a concrete product having a single-layer or multi-layer structure by centrifugal molding, and a manufacturing apparatus therefor. <P>SOLUTION: A supply device 30 concentrically rotated almost in synchronous relation to a centrifugal matrix 10 is provided in the centrifugal matrix 10 and concrete is charged in inner forms 11 while controlling the rotational speed of a supply port 32 and the supply quantity of concrete so as to match them with the arrangement of the inner forms 11 to manufacture the centrifugally molded concrete product. In this case, concretes different in kind are charged in the inner forms 11 in series to manufacture the concrete product having a multi-layer structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method and an apparatus for producing a centrifugal concrete product such as a segment for tunnel lining.

  In the centrifugal molding of a concrete product in which an inner mold forming a concrete product such as a segment is mounted in a cylindrical centrifugal mother mold, and concrete is produced by placing concrete in the inner mold, a joint is installed. In addition, it was necessary to provide a gap between the inner molds because of the formwork payment. In such a centrifugal mold, there is a problem that there is no technique for putting a material such as concrete into the inner mold only during the rotation of the centrifugal matrix, and the thickness becomes uneven.

  For example, as shown in FIG. 9, an inner mold frame 110 is disposed in a centrifugal mother mold 100, and the centrifugal mother mold 100 is rotated in the directions of arrows 102 and 103 by a driving roller 101 to supply concrete 116 from a concrete supply device 115. As a result, the product thickness becomes uneven due to differences in the arrangement and dimensions of the inner mold frame 110, the accumulation on the parts that do not need to be supplied outside the inner mold frame, and the change in the thickness in the rotation direction and the counter-rotation direction. Can't get the right product. In addition, a laminated product of different materials 120 and 121 cannot be manufactured properly.

  Therefore, it is unavoidable that the inner mold is filled with concrete in advance, the inner mold with the top lid attached is installed in the centrifugal mold, and the centrifugal mold is rotated and compacted by centrifugation. (For example, refer to Patent Document 1).

  FIG. 10 shows a process of manufacturing a laminated product of different materials 120 and 121 using an inner mold having an upper lid 130 in order to cope with this problem. First, as shown in FIG. 10 (a), the first material 120 is filled in the inner mold, and the upper lid 130 is closed as indicated by an arrow 131, and this inner mold is shown in FIG. 10 (b). Is mounted in the centrifugal mother mold 100, and the rotation shown by the arrow 103 is given to perform centrifugal compaction. Next, the rotation of the centrifugal mother die 100 is stopped, and as shown in FIG. 10C, the upper lid 130 of the inner mold is removed, the second material 121 is supplied into the inner mold, and the upper lid 130 is indicated by an arrow 131. Press like so. As shown in FIG. 10D, the centrifugal mother die 100 is again rotated in the direction of the arrow 103 to perform centrifugal molding. Such means are very labor intensive and poor in profitability.

Therefore, centrifugal molding of such a conventional concrete product takes time and is extremely inefficient to manufacture a multilayer molded product in which different compound materials are formed in multiple layers in the work process. It was very difficult to produce such a molded product.
JP-A-7-205124 (page 2-4, FIG. 1)

  In view of the above circumstances, the present invention develops and provides a centrifugal molded concrete product manufacturing method and apparatus that can easily manufacture a single-layer or multi-layer concrete product by centrifugal force molding. With the goal.

  The present invention has been made to solve the above-mentioned problems, and when a concrete product is centrifugally molded by attaching an inner mold for molding a concrete product in a cylindrical centrifugal mother mold, it is concentric with the centrifugal mother mold. A supply device that rotates substantially synchronously and supplies the concrete into the inner mold is provided in the centrifugal mother mold, and the rotation speed of the supply device and the opening and closing of the open / close gate are determined according to the size, arrangement, and A method for producing a centrifugally-molded concrete product, characterized in that concrete is thrown into an inner mold while being controlled in accordance with movement. Here, the centrifugal matrix is a rotating cylinder that applies centrifugal force to the contents. In the above method of the present invention, if different types of concrete are sequentially put into the inner mold to produce a multilayered concrete product, it is possible to easily produce a multilayered product in which different types of concrete are integrated. It is possible and suitable.

  In the present invention, the centrifugally-molded concrete product can be appropriately manufactured by controlling the operation of the supply port of the supply device that rotates at a speed slightly decelerated from the rotational speed of the centrifugal master mold and rotates concentrically with the mold.

  In the present invention, the supply port of the concrete supply device is controlled so as to have a very slight relative speed with respect to the centrifugal mother mold, and the concrete is supplied into the inner mold within the centrifugal force field. Regardless, it is possible to easily control the charging of the concrete to every corner of the inner mold. In addition, this is an epoch-making manufacturing method that allows an arbitrary amount of various types of concrete to be introduced without stopping the rotation of the centrifugal matrix or changing the supply device.

  The apparatus of the present invention capable of suitably carrying out the above-described method of the present invention includes a centrifugal mother mold having an inner mold for molding a concrete product attached therein, and a centrifugal mother mold positioned concentrically with the centrifugal mother mold. An apparatus for producing a centrifugally-molded concrete product, comprising: a concrete supply device that rotates rapidly; and a control device that controls a supply amount from the supply device.

  In the centrifugal molded concrete product manufacturing apparatus, the control device gives a minute speed difference between the rotation speed of the centrifugal matrix and the rotation speed of the supply device, and controls the opening and closing of the gate of the supply port of the supply device. It is preferable to use a centrifugal molding concrete product manufacturing apparatus provided with a control device that controls the amount of concrete supplied to the inner mold.

  According to the present invention, it is possible to easily produce a high-strength, high-precision concrete product having a single-layer or multi-layer structure by centrifugal molding, which greatly contributes.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view showing an apparatus for producing a centrifugally molded concrete product according to an embodiment of the present invention.

  The centrifugal molded concrete product manufacturing apparatus 1 of the present invention attaches and fixes a plurality of inner molds 11 in a centrifugal mold 10, supplies the concrete to the inner mold 11, and rotates the centrifugal mold 10 to make concrete. This is a type of manufacturing a segment or the like by applying a centrifugal force. The supply device 30 for kneading concrete includes a supply port 32 and supplies the kneaded concrete into the inner mold 11 attached to the inside of the centrifugal mother die 10.

  The centrifugal mother die 10 is placed on two drive rollers 12 and is rotated in the direction of an arrow 14 by a motor 13 to apply centrifugal force to the concrete in the inner mold 11. The magnitude of the centrifugal force to be applied is 1.5 g to 6 g (g is the acceleration of gravity). More preferably, it is 2.5-4.5g. The centrifugal mother die 10 is rotated at a rotational speed that gives this centrifugal force value, the supply port 32 of the supply device 30 is advanced and inserted into the centrifugal mother die 10, the supply port 32 is rotated, and the rotation speed is adjusted to the centrifugal mother die 10. Coarse adjustment to a speed almost synchronized with the rotation speed. That is, the supply port 32 moves on the inner mold 11 in the centrifugal mother mold 10 at a slightly different relative speed. The relative speed difference may be set to ± 15 cm / sec, more preferably fine adjustment to be ± 5 cm / sec, and the concrete is supplied from the concrete supply device 30 into the inner mold 11.

  FIG. 2 shows a longitudinal sectional view of the concrete supply device 30. The concrete supply device 30 includes a concrete hopper 31, and a stirring paddle 36 is provided in the hopper 31. The stirring paddle 36 is rotated by a motor 36 a and supplies stable concrete to the screw conveyor 37. A single or multiple screw conveyor 37 is provided at the lower portion of the hopper 31.

  FIG. 4 is a cross-sectional view of an apparatus including one hopper 31 and one screw conveyor 37, and FIG. 3 illustrates two hoppers 31 and two screw conveyors 37.

  The screw conveyor 37 may be configured so that the pitch of the screw blades on the destination side is larger than the pitch of the screw blades on the lower portion of the hopper 31 so that the concrete can be smoothly conveyed. An appropriate ratio of the pitch of the screw blades is 1.1 to 1.3. In this way, it is possible to prevent the concrete extruded from the forefront of the screw conveyor 37 from being tightened, and to realize a subdivided concrete flow.

  A supply port 32 that is rotated by a motor 38 via a gear 39 is provided at the tip of the screw conveyor 37. The supply port 32 opens in the outward direction of the rotation radius, and discharges the concrete outward in the radial direction. The supply port 32 includes a balance weight 32a, and an opening / closing gate 34 (see FIG. 1) that is opened and closed by an actuator 35 before the work starts and after the work ends. Further, scraping blades for subdividing the concrete extruded from the screw conveyor 37 are attached to the inside of the supply port 32 in an oblique spiral shape (not shown) so that the concrete is directed to the input port 32. Since the centrifugal force due to the rotation is simultaneously received inside the supply port 32, the concrete is radiated from the supply port 32 as a finely divided flow and is put into the inner mold 11 in the centrifugal mother mold 10.

As shown in FIG. 1, the inner mold 11 is mounted in the centrifugal mother mold 10 with a plurality of molds having different circumferential dimensions spaced apart from each other. The input pattern of the concrete from the supply device 30 is determined by the size and arrangement of these inner molds. The control device 50 controls the operation stop of the screw conveyor 37 according to this pattern. That is, the arrangement conditions of the concrete input section a ₁ a ₂ a ₃ a ₄ and the concrete input stop section; b ₁ b ₂ b ₃ b ₄ shown in FIG. 1 are input to the control device 50 to determine the concrete input pattern. .

  The control device 50 performs control in consideration of a time difference in the arrival time of the concrete into the inner mold 11 due to the rotational speed of the centrifugal mother die 10, its inner radius, and the viscosity of the concrete.

  The lower part of the concrete supply device 30 is provided with a lifting mechanism 40 for adjusting its height. This is because it is necessary to match the center of the screw conveyor 27 of the concrete supply device 30 with the center of the centrifugal mother die 10. At the same time, the lifting mechanism 40 includes traveling wheels 42 that sandwich the rails 41 in the form of embedding the rails 41 in order to stabilize and stabilize the supply device 30.

  For the measurement of the concrete supply amount, for example, an impact flow meter or the like is provided in the supply port 32 and the actual input weight to each inner mold 11 is measured. Based on the input signal from the flow meter, the control device 50 compares the design input pattern with the actual input amount and corrects the rotational speed control of the screw conveyor 37.

  The control device 50 inputs data from the rotation drive motor 13 of the centrifugal mother die 10, the dimensions and arrangement of the inner mold 11, the rotation motor 38 of the supply port 32, and the opening / closing device 35 of the opening / closing gate 34, and outputs a control signal. .

  According to the apparatus of the present invention, the amount of supplied concrete can be accurately controlled, so that the concrete product can be laminated or manufactured by various kinds of materials in the thickness direction and the width direction.

  Once the concrete has been charged, the product is manufactured according to the normal centrifugal molding method.

  In the present invention, a split-type centrifugal molded product, for example, a concrete product for tunnel lining, a terrazzo (artificial marble block), a curved liner, a curb, a gutter lid, and the like can be easily manufactured.

  Further, any kind of laminated product or sandwich molded product of different materials 51 and 52 as shown in FIGS. 5 and 6, such as concrete, resin concrete, fiber-containing concrete, refractory concrete, acid resistant concrete, antibacterial concrete, etc. It has also become possible to centrifugally mold a molded product in which materials are combined in arbitrary dimensions.

  Furthermore, by applying this method, suction dewatering finish on the inner surface side of curved concrete, surface VB finish, and surface smoothing finish are possible, and centrifugal molding such as manhole ring with lifting step hardware attached inside is possible. Can be realized.

  According to the present invention, since a certain amount of concrete can be put into the inner formwork, the thickness of the product concrete product becomes accurate. Further, as shown in FIGS. 7 and 8, for example, the required amount of the dissimilar materials 53 and 54 having properties necessary for the inner surface, the outer surface, or the intermediate layer of the segment 55 can be accurately arranged. As a result, it is possible to improve the degree of freedom of processing, such as increasing the strength of the product surface, improving heat resistance, improving wear resistance, reducing weight, forming aesthetic surfaces, forming colored surfaces, adding pattern designs, etc.

It is a whole front view of the centrifugal molding frame of an Example. It is a longitudinal cross-sectional view of the concrete supply apparatus of an Example. It is a cross-sectional view of a double screw conveyor. It is a cross-sectional view of a series of screw conveyors. It is a cross-sectional view showing an example of a two-layer product (concrete product). It is a cross-sectional view showing an example of a two-layer product (concrete product). It is a top view which shows the example of the concrete product which arrange | positioned dissimilar materials around. It is AA sectional drawing of FIG. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art. It is explanatory drawing of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus of centrifugal molding concrete 10 Centrifugal master | mold 11 Inner mold 12 Drive roller 13 Motor 14 Arrow 30 Concrete supply apparatus 31 Hopper 32 Supply port 33 Arrow 34 Opening / closing gate 35 Actuator 36 Stir paddle 36a, 37a Motor 37 Screw conveyor 38 Motor 39 Gear device 40 Elevating mechanism 41 Rail 42 Traveling wheel 50 Control device 51, 52 Dissimilar material 53, 54 Dissimilar material 55 Segment

Claims (4)

  Supplying the supply device that supplies the concrete into the inner mold by rotating in synchronism with the centrifugal mold and the concrete mold when the concrete mold is cast by attaching the inner mold for molding the concrete mold inside the cylindrical mold. Insert the mouth into the centrifuge mold, and control the rotational speed of the feed port and the concrete supply amount according to the size of the centrifuge mold, the arrangement and movement of the inner mold, and put the concrete into the inner mold. A method for producing a centrifugally-molded concrete product, characterized in that it is injected.   2. The method for producing a centrifugally-molded concrete product according to claim 1, wherein different types of concrete are sequentially put into the inner mold to produce a multi-layered concrete product.   A centrifugal mother mold having an inner mold for molding concrete products mounted therein, a concrete supply device positioned in the centrifugal mother die and having a supply port rotating concentrically with the centrifugal mother die, and a supply amount from the supply device An apparatus for producing a centrifugally-molded concrete product, comprising:   The control device gives a minute speed difference between the rotation speed of the centrifugal mother mold and the rotation speed of the supply port of the supply device, controls the opening and closing of the gate of the supply port, and supplies the concrete supplied into each inner mold The apparatus for producing a centrifugally-molded concrete product according to claim 3, wherein the apparatus is a control device for controlling the pressure.

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