JP2004255611A - Apparatus for molding pillar-shaped product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus capable of molding a stable pillar-shaped product high in roundness by preventing the bending of a steel pipe pile body at the time of production or stable operation while holding high safety. <P>SOLUTION: The apparatus constituted so as to centrifugally mold the solidified fluid in the steel pipe pile body into a pillar shape is equipped with a vibration suppressing mechanism for suppressing vibration by pressing the steel pipe pile body during rotation. The vibration suppressing mechanism comprises a pair of follower belt bodies 62 provided opposedly so as to hold the steel pipe pile body 1 and one set of upper and lower pulleys 60 and 61 over which the follower belt bodies 62 are trained in a freely traveling state. The follower belt bodies 62 travel in contact with the steel pipe pile body to press the steel pipe pile body. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for forming a columnar product such as a belt-type centrifugal column making machine. In particular, the present invention relates to a technique for suppressing vibration during molding.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a method of forming a columnar product such as a concrete pipe or a concrete pile from a solidifying fluid such as concrete, a manufacturing method by centrifugal molding has been used.
As a method of centrifugal molding, there is a belt method in which a cylindrical steel pipe pile is placed on a belt-like member running and a mold frame is rotated.
As a conventional technique using this manufacturing method, the methods disclosed in Patent Documents 1 and 2 and the like are known.
[0003]
[Patent Document 1] JP-A-2002-240026 [Patent Document 2] JP-A-2002-240027
As described herein, in a conventional belt-type centrifugal column mill, when performing centrifugal column forming at a high speed, a horizontal runout of the mold is likely to occur, and the risk of the mold being detached from the belt-shaped member is increased. On the other hand, it is desired to create a method for supporting a mold by a belt-like member, which prevents the mold from popping out and performs highly safe production.
[0005]
The method disclosed in Patent Document 1 discloses a technique in which the speed of a belt-shaped member is measured and each speed is adjusted to a value that does not move in the axial direction during rotation of the steel pipe pile. Further, the method disclosed in Patent Document 2 discloses a technique that creates a suitable position of a pulley for rotating the belt-shaped member, enables the belt-shaped member to run at a high speed, and manufactures a high-quality columnar product. I have.
[0006]
By these techniques, the rotating steel pipe pile is supported by a belt-shaped member in the vertical direction, and it is possible to provide a method of manufacturing a columnar product, which has been impossible in the past, but it is possible to support the steel product in a horizontal direction during rotation. Therefore, there is a problem of moving in that direction.
That is, when the steel pipe pile moves freely in the horizontal direction, the steel pipe pile itself resonates when the bending natural frequency of the steel pipe itself is within the operation range, and the steel pipe pile may be bent. Moreover, as a result of resonance, there is a possibility that an unstable operation may be induced during manufacturing.
In particular, since the natural frequency of bending of the steel pipe pile itself is determined by the rigidity and length of the steel pipe, a thin and long steel pipe is not preferable because the natural frequency often falls within the operation range. Therefore, from the viewpoint of safety, there is a problem that the production must be limited by using a long and thin steel pipe pile body.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems of the related art, and has as its object to prevent bending and unstable operation of a steel pipe pile during manufacturing while maintaining high safety. An object of the present invention is to provide a device capable of forming a stable product with high circularity.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a columnar product forming apparatus according to the present invention has the following features.
That is, in the invention according to the first aspect, the substantially cylindrical steel pipe pile filled with the solidifying fluid in the solidification process is supported by the flexible belt-shaped member, and the belt-shaped member travels. In the forming apparatus for centrifugally forming the solidifying fluid in the steel pipe pile into a column by applying rotation to the steel pipe pile, a vibration suppression mechanism that suppresses vibration by pressing the rotating steel pipe pile is provided. An apparatus for forming a columnar product is provided.
[0009]
In the invention according to claim 2, in the forming apparatus according to claim 1, at least one pair of pulleys configured to run the belt-shaped member and to support the steel pipe pile body is provided on the steel pipe pile body. Provided is a columnar product forming apparatus provided with a vibration suppressing mechanism for suppressing vibration of the steel pipe pile by pressing an outer peripheral surface from a side.
[0010]
In the invention according to claim 3, the vibration suppressing mechanism in the molding apparatus according to claim 1 is configured by at least one roller that is rotatable with the steel pipe pile and presses the steel pipe pile substantially vertically downward. To provide a columnar product forming apparatus.
[0011]
Further, in the invention according to claim 4, the vibration suppressing mechanism in the forming apparatus according to claim 1 is provided with a pair of driven belt members provided to face each other with the steel pipe pile interposed therebetween, and the driven belt members are made to run freely. The present invention provides a configuration in which a pair of upper and lower driven belt pulleys to be wound are wound, and the driven belt body travels while contacting both sides of the outer peripheral surface of the pipe pile body so that the steel pipe pile body can be pressed. .
[0012]
A vibration suppressing mechanism according to a fifth aspect of the present invention is constituted by a rotatable plate-like body that presses both ends of a steel pipe pile from the direction of its rotation axis.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the drawings.
1 and 2 are a plan view and a side sectional view showing a main part of a conventional columnar product forming apparatus. The present invention is a technique for providing a vibration suppressing mechanism in such a columnar product forming apparatus, and the operation will first be described with reference to these drawings.
Concrete, which is a material of the product, is filled in a mold (1) made of a substantially cylindrical steel pipe, and is installed in a forming apparatus. Although the concrete at the time of filling has fluidity, it is already in the solidification process, and it becomes the final product shape by centrifugal molding with this device, and reaches a strength that can be handled. Final strength is reached through pre-curing and full curing, or through natural curing for a period of time.
[0014]
The formwork (1) is mounted and supported on a plurality of flexible belt-like members (20) (20), such as an annular endless belt. By moving the belt-shaped member (20) by the following means, the mold (1) is rotated, and the concrete inside thereof is centrifugally formed into a column shape.
[0015]
The driving force from the prime mover (10) is transmitted to a long transmission shaft (11) installed substantially horizontally. Then, it is guided to the drive shaft (23) through a plurality of gear boxes (22) arranged in parallel along the axial direction of the transmission shaft (11). The gear box (22) is fixed to one end of the gantry (21), and the other end is provided with a support member (27) that supports the driven shaft (25).
The belt-like member (20) is bridged between a drive pulley (24) fitted on the drive shaft (23) and a driven pulley (26) fitted on the driven shaft (25).
The end pressing roller (28) is a safety device that stops the movement of the mold (1) that has moved on the belt-shaped member (20) in the axial direction of the mold (1). The details are disclosed in Patent Document 3 and the like.
[0016]
[Patent Document 3] Japanese Utility Model Publication No. Sho 62-16847
In the first embodiment of the present invention, such a molding apparatus can be provided with the pressing rollers (30) and (30) as the vibration suppressing mechanism shown in the side sectional view of FIG. 3 and the perspective explanatory view of FIG.
That is, as shown in FIG. 4, a rotatable pressing roller (30) (30) is pivotally supported on a pressing bridge (31) attached to a portal column (not shown), and the pressing roller (30) (30) 30) The pressing bridge (31) presses the outer peripheral surface of the steel pipe pile (1) substantially vertically downward to suppress vibration during rotation.
[0018]
In the conventional configuration, since the steel pipe pile (1) is placed on the belt-like member (20), the bending natural frequency of the steel pipe pile (1) itself is reduced by the running of the belt-like member (20). When the operation condition such as speed is met, resonance occurs, and the steel pipe pile (1) may move largely, or the roundness may not be sufficiently increased.
However, according to the configuration of the present invention, vibration can be suppressed by the pressing rollers (30) (30) pressing downward during rotation of the steel pipe pile (1).
In particular, columnar products, which tend to cause resonance and cannot be manufactured conventionally, such as thin and long steel pipes, can be manufactured safely while maintaining high roundness.
The pressing rollers (30) and (30) are made of metal wheels, and rubber is wound around the wheels so that the pressing rollers (30) and (30) rotate smoothly together with the steel pipe pile (1), thereby preventing damage.
[0019]
The pressing rollers (30) (30) of this configuration can move up and down together with the pressing bridge (31), and can operate even when the diameter of the steel pipe pile (1) is different as shown in FIG. .
That is, when a steel pipe pile having a small diameter shown by (1 ') is used, the pressing rollers (30) and (30) descend to the position shown by the two-dot chain line, and the vibration of the steel pipe pile (1') is suppressed. can do.
[0020]
It is desirable to provide a pair of pressing rollers (30) (30) at a plurality of locations in the forming apparatus, and it is preferable to provide at least three locations near both ends and near the center of at least the entire length of the steel pipe pile (1).
Further, in the vicinity where the belt-shaped member (20) is disposed, there is no possibility that the steel pipe pile body (1) is deformed even if pressed downward, so that the pressing rollers (30) and (30) are connected to the belt-shaped member (20). It is preferable to provide it near the position of ()).
[0021]
FIG. 5 is an explanatory plan view showing positions where the vibration suppressing mechanism according to the present invention is disposed in the steel pipe piles (1) having various lengths (A to C). It is a positional relationship between the arrangement positions of a plurality of belt-like members (20), (20), (20), (20), and (20) provided in the figure and the vibration suppression mechanisms (50), (50), and (50) indicated by oblique lines.
The steel pipe pile body (1) shown in FIG. 1A has a total length of 13 to 15 m, and has one end of the steel pipe pile body (1) immediately adjacent to the first belt (a) and the third belt (c). A total of three locations are provided between the belts (d), directly on the third belt (c) (substantially at the center of the entire length) and on the other side of the fifth belt (e). In the steel pipe pile body (1) of A, for example, it may be provided directly on the side of the second belt (b) and the fourth belt (d) to have a total of five places.
[0022]
B has a total length of 10 to 12 m, and has one end of the steel pipe pile (1) immediately adjacent to the first belt (a) and the second belt (b) / third belt. A total of three places are provided between the belts (c), directly on the second belt (b) (approximately the center of the entire length) and on the other side of the fourth belt (d).
Further, the steel pipe pile body (1) shown in C has a total length of 7 to 9 m, and one end of the steel pipe pile body (1) immediately adjacent to the first belt (a) and the second belt (b). A total of three locations are provided between the third belt (c), on the side of the second belt (c) (substantially at the center of the entire length) and on the side of the third belt (c), at the other end. I have.
With the above-described configuration, by appropriately arranging the vibration suppressing mechanism in accordance with the entire length to be molded, a highly accurate and safe molding apparatus can be provided.
[0023]
Such a pressure roller (30) may be provided at only one place at the upper center of the steel pipe pile (1) as shown in the figure, or may be provided at only one place at the center of the upper part, or may be provided at three places at the center and left and right. . These can be provided as appropriate according to the diameter of the steel pipe pile (1) and the operation mode of the device, and when provided at a plurality of locations, the number of pressing rollers (30) may be changed depending on the location.
[0024]
A second embodiment according to the present invention will be described. FIG. 6 is a side cross-sectional view of the second embodiment, and FIG. 7 is a perspective view of the present apparatus viewed from the axial direction of the steel pipe pile (1). Also in this embodiment, a vibration suppressing mechanism capable of suppressing the vibration of the steel pipe pile (1) and preventing the horizontal movement is provided based on the forming apparatus shown in FIG.
[0025]
In the present embodiment, a pair of upper and lower pulleys for driven belts (60) and (61) are provided on both sides of the steel pipe pile body (1), and the driven belt body (62) is provided on the pulleys (60) and (61). ). The driven belt pulleys (60) and (61) are rotatably supported one by one on the vibration suppression mechanism support main bodies (63) and (63) which are erected.
The driven belt body (62) is normally wound in a loose state, but is pressed against the outer peripheral side of the steel pipe pile body (1) as shown in the figure due to the flexibility of the driven belt body (62). As a result, the driven belt body (62) runs together with the steel pipe pile body (1).
Here, in the vibration suppression mechanism support body (63), (64) and (65) are projections provided at the upper end and the lower end of the support body (63) so as not to interfere with the steel pipe pile (1). The rotation shafts (66) and (67) of the driven belt pulley are supported at the protrusions by the support portions (68) and (69).
[0026]
According to this configuration, by setting the vibration suppression mechanism support main bodies (63) and (63) at an appropriate position toward the steel pipe pile body (1), it is possible to press horizontally from the driven belt bodies (62) and (62). This makes it possible to suppress the resonance caused by the natural vibration of the steel pipe pile (1).
As shown in the first embodiment, the vibration suppression mechanism of this configuration is also preferably provided at three or more places near both ends and the center of the steel pipe pile (1), and is arranged as shown in FIG. Location.
[0027]
Further, even in the case where the diameter of the steel pipe pile is small (1 '), the distance between the left and right driven belt pulleys (60) and (61) is reduced and the position is indicated by the two-dot chain line in FIG. Vibration can be suppressed. This contributes to the provision of a molding apparatus that can handle various moldings.
Particularly, in the case where the diameter of the steel pipe pile (1) is large, the rigidity of the steel pipe pile itself is low, so that the present embodiment is more effective than the method of supporting the steel pipe pile (1) in the point of the first embodiment. A method of supporting the steel pipe pile (1) with a large contact area as in the form is particularly suitable.
[0028]
Furthermore, as the third embodiment of the present invention, the steel pipe pile (1) shown in FIG. 8 is pressed against the end (1a) to prevent the steel pipe pile (1) from moving due to resonance and to stabilize. Rotation was realized.
In this embodiment, end core pressing devices (80) are provided at both axial ends of the steel pipe pile (1), respectively, to support the steel pipe pile (1). The end core pressing device (80) presses a rotatable plate (82) against an end plate at an end (1a) of the steel pipe pile (1) by an elastic member (81) such as a spring. The plate-like body (82) at the time of pressing is indicated by a dotted line.
[0029]
Conventionally, an end face tapered roller was provided at the end of the steel pipe pile to prevent the steel pipe pile from shifting. However, there is no function to suppress the vibration of the steel pipe pile (particularly at the time of resonance). There is a problem that the steel pipe pile cannot rotate stably near the section.
In the present invention, the end of the steel pipe pile body is stably supported by appropriately pressing the core of the steel pipe pile body with the large plate-like body, and the influence of resonance can be prevented.
[0030]
FIG. 9 is a side sectional view of a fourth embodiment slightly different from the above-described first to third embodiments in the configuration of the molding apparatus. The present embodiment is a forming apparatus having a different pulley driving configuration and including three pulleys.
In the present molding apparatus, a tension pulley (92) is arranged together with a driving pulley (90) and a driven pulley (91). The tension pulley (92) is movably disposed to absorb the elongation of the belt-shaped member (93), and can adjust the tension of the belt-shaped member (93).
[0031]
Here, in the configuration of the conventional molding apparatus, as shown in FIG. 10, the driving pulley (100), the driven pulley (101) and the tension pulley (102) are composed of three pulleys, and the driving pulley (100) and the driven pulley It is configured to be placed on a belt-shaped member (104) suspended in a valley shape during (101) and to be formed as the belt-shaped member (104) runs.
At this time, the driving pulley (100) and the driven pulley (101) are rotated while maintaining a predetermined distance, as disclosed in Patent Document 4 and the like.
[0032]
[Patent Document 4] Japanese Patent Application Laid-Open No. 2002-240014
In the present invention, as shown in FIG. 9, the driven pulley (91) is moved toward the drive pulley (90) to sandwich the steel pipe pile (1), thereby realizing the vibration suppressing mechanism. As a result, the driving pulley (90) and the driven pulley (91) press the rotating steel pipe pile (1) in the horizontal direction, thereby suppressing the vibration of the steel pipe pile (1) and moving the steel pipe pile (1) in the horizontal direction. Jumping out can be prevented. Since the position of the driven pulley (91) can be moved according to the diameter of the steel pipe pile (1), it is possible to form various columnar products.
According to this embodiment, the belt-shaped member (93) can be appropriately tensioned by using the tension pulley (92), and the vibration suppressing mechanism can provide a safe and high roundness. And high-precision manufacturing having
[0034]
As described above, the four embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and the above embodiments can be used in combination. Furthermore, the forming device mounting the vibration suppression mechanism according to the present invention can be applied to any forming device that rotates a steel pipe pile using a belt-shaped member. For example, the forming apparatus in the first to third embodiments may be a three pulley forming apparatus as shown in FIG.
[0035]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
That is, since the columnar product forming apparatus according to claim 1 can be provided with a vibration suppressing mechanism, the steel pipe pile can be stably rotated even at the time of resonance according to the vibration of the steel pipe pile, particularly the natural frequency. Therefore, it contributes to the molding of a product having high safety and high roundness.
[0036]
According to the vibration suppression mechanism of the second aspect, the interval between the pulleys that rotate the belt-shaped member is regulated, and the steel pipe pile is pressed horizontally at the contact point between the pulley and the steel pipe pile. This configuration is easy to implement because it is not necessary to provide a new roller or the like, and contributes to a reduction in cost of the apparatus and an improvement in maintainability.
[0037]
In the vibration suppressing mechanism according to the third aspect, since the steel pipe pile can be pressed downward by the pressing roller, the protrusion of the steel pipe pile is completely suppressed, and large movement of the steel pipe pile during resonance or the like is prevented. can do. It contributes to a columnar product forming device that can form products with high safety and high precision.
[0038]
According to the vibration suppressing mechanism of the fourth aspect, it is possible to adopt a configuration in which the steel pipe pile is pressed with a wide contact area by the driven belt body capable of pressing the steel pipe pile in the horizontal direction. For this reason, even if the steel pipe pile has a particularly large diameter, the vibration can be effectively suppressed without deforming the steel pipe pile.
[0039]
According to the vibration suppressing mechanism of the fifth aspect, since the end of the steel pipe pile can be supported on the rotating shaft, the vibration suppressing effect is higher than that of the conventional configuration using the end face tapered roller, and the steel pipe pile is improved. A stable rotation of the body becomes possible.
[Brief description of the drawings]
FIG. 1 is a plan view showing a main part of a conventional columnar product forming apparatus.
FIG. 2 is a side sectional view of the same.
FIG. 3 is a side sectional view of a main part of the molding apparatus and a vibration suppressing mechanism according to the first embodiment of the present invention.
FIG. 4 is an explanatory perspective view of the same.
FIG. 5 is a plan layout view of a main part of a molding apparatus and a vibration suppression mechanism according to the first and second embodiments of the present invention.
FIG. 6 is a side sectional view of a main part of a molding apparatus and a vibration suppression mechanism according to a second embodiment of the present invention.
FIG. 7 is a perspective view of the same seen from the axial direction.
FIG. 8 is a front view of a vibration suppression mechanism according to a third embodiment of the present invention.
FIG. 9 is a side sectional view of a main part of a molding apparatus and a vibration suppression mechanism according to a fourth embodiment of the present invention.
FIG. 10 is a side sectional view showing a main part of a conventional columnar product forming apparatus.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 steel pipe pile 20 belt-shaped member 24 drive pulley 26 driven pulley 60 driven belt pulley 61 driven belt pulley 62 driven belt body 63 vibration suppression mechanism support body 64 upper convex portion 65 lower convex portion 66 rotating shaft of driven belt pulley 67 Rotary shaft of driven belt pulley 68 Shaft support 69 Shaft support

Claims (5)

A substantially cylindrical steel pipe pile filled with a solidifying fluid in a solidification process is supported by a flexible belt-shaped member, and the belt-shaped member is run to impart rotation to the steel pipe pile. In a molding device for centrifugally molding the solidifying fluid in a steel pipe pile into a columnar shape,
An apparatus for forming a columnar product, comprising a vibration suppressing mechanism for suppressing vibration by pressing a rotating steel pipe pile. In the molding device,
It comprises at least two pulleys for running the belt-like member,
At least one pair of the pulleys supporting the steel pipe pile,
The apparatus for forming a columnar product according to claim 1, further comprising a vibration suppressing mechanism that suppresses vibration of the steel pipe pile by pressing an outer peripheral surface of the steel pipe pile from a side. The vibration suppression mechanism,
It is rotatable with the steel pipe pile body,
The apparatus for forming a columnar product according to claim 1, comprising at least one roller that presses the steel pipe pile substantially vertically downward. The vibration suppression mechanism,
A pair of driven belt bodies provided to face each other with the steel pipe pile body interposed therebetween;
A set of upper and lower driven belt pulleys around which each driven belt body is wound so that it can run freely,
The columnar product forming apparatus according to claim 1, wherein the driven belt body runs while contacting both sides of the outer peripheral surface of the steel pipe pile body so as to press the steel pipe pile body. The vibration suppression mechanism,
2. The columnar product forming apparatus according to claim 1, wherein the columnar product is formed by a rotatable plate-shaped member that presses both end portions of the steel pipe pile from the direction of the rotation axis. 3.

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