JPS6392413A - Method and device for manufacturing concrete pipe with oblique wall - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and an apparatus for manufacturing a concrete pipe with a slanted wall for use as a manhole cover, for example, by using centrifugal force and compaction force. .

[Conventional technology]

In the concrete secondary product manufacturing industry, a large number of products with circular inner diameters are manufactured, such as reinforced concrete pipes, sewers, sewage rainwater catchments, permeable pipes, and manholes.

As a manufacturing method for concrete pipes,
In Publication No. 27, formwork rings with the same inner diameter are fixed to both ends of the inner surface of a cylindrical outer formwork to form a ζ formwork, which is suspended and supported by a horizontal rotating shaft, and the formwork is rotated by the rotational force of the formwork. However, a technique has been disclosed in which a cylindrical pipe is manufactured by supplying concrete material into a formwork and utilizing centrifugal force and rolling force of a rotating shaft against the concrete material.

Such conventionally known technology is limited to tubes with concentric inner diameters and cylindrical shapes, and it has been impossible to manufacture tubes with conical or truncated conical shapes.

Therefore, for reinforced concrete products such as sewer manholes that include slanted walls, the lower cylindrical side blocks are manufactured using centrifugal force or compaction methods, but the upper slanted walls must be filled using hand-packed products that utilize vibrations, etc. Not only does it create a sense of incongruity in the external shape, but it also creates a difference in quality, causing a lack of harmony as a whole as a -kill manhole, lowering the product value, and not increasing productivity. There was a problem.

[Problem that the invention seeks to solve]

For this reason, concrete 1 with a truncated conical inner diameter
Even if the ratio of the upper inner diameter to the lower inner diameter of a pipe changes, if the formwork has the same shape, the molding machine can be used to manufacture it with fixed equipment, and the wall pressure of the slanted wall can be maintained at the top end and bottom end. There was a need to develop a technology that could use the same molding machine even if the parts were different, and that could produce products with the same finish and appearance as conventional cylindrical molded products at reduced costs.

An object of the present invention is to provide a method and apparatus for manufacturing a concrete pipe with inclined walls that meet these demands.

[Means for solving problems]

To explain with reference to the drawings, the method for manufacturing concrete pipes 1 to 1 with inclined walls according to the present invention is as shown in FIG. The rotating shaft 5 passing through the formwork 1 is circumscribed on the inner circumferential surface of the formwork ring 3.4 to suspend the formwork 1 and transfer its rotational force to the formwork ring 3.4. to rotate formwork 1,
It is basically the same as conventionally known technology to manufacture a concrete pipe by applying the centrifugal force caused by the rotational force and the rolling force of the rotating shaft 5 to the concrete material supplied to the concrete material. , the inner diameter 3a of one formwork ring 3 is made larger than the inner diameter 4a of the other formwork ring 4, so that the imaginary line connecting the large diameter part 3a and the small diameter part 4a does not have a truncated conical shape, thereby forming a formwork for inclined walls. 1, and furthermore, the rotating shaft 5 is tilted to form a diagonal shaft, and the formwork 1 for the diagonal wall is suspended with its large diameter portion 3a positioned on three sides. .

Further, as shown in FIG. 1, the apparatus for carrying out the L force distribution method has formwork rings 3.4 at both ends of a large cylindrical outer formwork 2, one of which has an inner diameter 3a larger than the other inner diameter 4a. A fixed formwork 1 for a sloped wall; a drive device 6 for suspending the formwork 1 for a sloped wall with the large diameter part 3a of the formwork ring positioned upwardly and transmitting rotational force thereto; It is characterized by comprising a movable base 7 that tiltably supports the tilting rotation shaft 5 and the drive unit W6, and support rules 8.9 that support the upper and bottom portions of the outer peripheral surface of the formwork 1 for the slanted wall. do.

In FIG. 1, reference numeral 9 denotes a frame for fixing the rotating shaft 5, the drive device 6, and the like.

The rotating shaft 5 and the motor 6a and reducer 6b constituting the drive device 6 are installed coaxially or in parallel on a movable base 7 together with the bearings 5a and 5b, and the movable base 7 is connected to the middle part of the frame 9 by a movable joint 10. The rotary shaft 5 is provided so as to be tiltable by seven actuators (for example, hydraulic cylinders) not shown, so that the inclination angle of the rotating shaft 5 can be arbitrarily selected.

The outer formwork 2 is used to hold the half cylinders together and use fastening fittings (not shown) to take out the product after forming and curing the concrete pipe.
It is preferable to have a structure that can be tightened and fixed with. Furthermore, a recess 2a is provided around the outer periphery of the outer form 2, with which the support roll 8 comes into contact. In the illustrated example, the outer formwork 2 has a cylindrical shape in which the inner diameter 2b is equal in the front and back, but it is shaped like a truncated cone parallel to the diagonal line connecting the large diameter part 3a and the small diameter part 4a of the form ring 3.4. You can.

Since the formwork rings 3 and 4 are suspended from the inclined rotating shaft 5 and are rotated by the frictional force thereof,
A wear-resistant metal material is used, and the lower form ring 4 is provided with a bottom portion 4b that abuts against the support roll 9. This support roll 9, together with the support roll 8, prevents the slope wall formwork 1 from swinging and shaking during rotation.

One support roll 8 is pivotally supported by a pair of support arms 8a. The support arm 8a is fixed via a spring member 8b to one end of an L-shaped link 8C whose intermediate portion is pivotally connected to a support shaft 8d at the upper part of the pedestal 9, and the other end of the link 8C is also attached to the upper part of the pedestal 9. It is connected to a piston rod 8e of a hydraulic (or pneumatic) cylinder 8f fixed to. Therefore, as shown by the two-dot chain line, the support roll 8 is raised and lowered by the operation of the cylinder 8f, and is elastically pressed against the outer periphery of the outer form 2 by the spring member 8b. The other support roll 9 is fixed to the bracket 9a of the frame 9,
It may be constructed in the same manner as the support roll 8 mentioned above.

Reference numeral 11 denotes an inverted truncated conical sub-shaft extrapolated to the rolling part of the rotating shaft 5, and a flange 1 that prevents vertical displacement of the formwork 1 in the axial direction.
It has 1a and llb. This sub-shaft 11 is connected to the formwork ring 3
．． 4 has different inner diameters 3a, 4a on both sides and are not the same, this is to prevent a difference in circumferential speed and an increase in friction and to avoid direct wear of the rotating shaft 5. The inclination angle of the sub-shaft 11 is 0° because it is concentric with the rotating shaft 5 when the meat pressure of the target product is constant, but when the meat pressure difference is large,
The angle should be set in proportion to the degree of deformation of the truncated cone.

However, this angle is not precise, and when the slope wall formwork 1 is suspended from the rotating shaft 5, how horizontal the line that determines the internal pressure at the front and rear of the formwork ring at the bottom remains. You just have to decide.

[Effect]

As shown in FIG.
The sub-shaft 11 is rotated by the driving device 6, and the concrete material is supplied into the formwork while rotating the formwork. A product P corresponding to the space formed by the inner surface (2b) of 2 and the large diameter portion 3a and small diameter portion 4a of the form ring 3.4 is obtained. This is compared to the conventional horizontal axis concrete construction.
1. It is the same as in the case of tube manufacturing. FIG. 2 shows the product P, which is a concrete pipe having the same outer diameter, a truncated conical inner diameter, and a concave portion P1 at the top.

At this time, the angle of the movable base 7 is fixed so that the line that determines the front and rear inner diameters of the formwork ring 3.4, that is, the line that connects the large diameter portion 3a and the small diameter portion 4a, is approximately horizontal.

When forming a concrete pipe, the upper and lower outer peripheral surfaces of the formwork 1 for inclined walls are supported by the support rolls 8.9, so that no rocking or wobbling occurs.

By the way, when the target concrete pipes have different wall pressures, an inverted truncated conical sub-shaft 11 is used as shown in the figure to prevent excessive friction due to the difference in circumferential speed as described above.

However, the difference in circumferential speed is because the sub-shaft 11 has the role of rolling the inner surface of the product and rubbing it diagonally at the same time.
As a result of experiments, it was confirmed that the finished state of the inner surface is better when the inner diameter difference (3a-4a) is 5 to 10%. Furthermore, if the difference in inner diameter exceeds 20%, there is a tendency for the contact surface of the rotating shaft with the smaller diameter with the mold ring to become more abrasive.

The actual inclination angle of the rotating shaft 5 can be adjusted by rotating the rotating shaft 5 by changing the angle by the distance corresponding to the movement of the center of gravity of the vertical cross section with respect to inclined walls having different wall pressures. In other words, balance during rolling pressure molding can be achieved if the center of gravity of the lower surface of the mold is at the center in the length direction of the mold, but when the center of gravity is moved by the amount that it tends to move due to internal pressure. In reality, there is lateral movement of the green concrete during rolling compaction, and this can be easily determined by whether or not a "gap" is created at the contact surface of the formwork ring with the green concrete. All you have to do is change the angle of the movable base.

Although the manufacture of concrete pipes P having inclined walls with different wall pressures has been described above, it will be understood that a truncated conical product P' having equal wall pressures as shown in FIG. 3 can also be manufactured in the same manner. Also, by making the rotating shaft 5 horizontal,
Needless to say, cylindrical products can be manufactured in the same way as before.

〔Effect of the invention〕

As explained above, according to the present invention, the same I
Using the L method, concrete pipes with slanted walls can be manufactured, and regardless of the wall pressure, it is only necessary to change the formwork using the same equipment. Furthermore, since concrete pipes with inclined walls and regular cylindrical pipes can be manufactured consistently using the same equipment, productivity is greatly improved and costs are reduced. moreover,
Since a product with the same quality as cylindrical pipes made using conventional methods can be obtained, its commercial value can be increased.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing a typical example of the device of the present invention. 2 and 3 are longitudinal sections of concrete pipes with inclined walls produced by the method of the invention, respectively. 1-Formwork for sloped wall 2-Outer formwork 3.4-Formwork ring 3a-Inner diameter (large diameter part) 4a-
- Inner diameter (small diameter part) 5 - (Inclination) rotating shaft 6 - Drive device 7 - Movable base 8.9 - Support roll Patent applicant Yoshi Nishimura Toshio Wanzaka

Claims (2)

[Claims] (1) The formwork 1 is constructed by providing formwork rings 3 and 4 at both ends of the cylindrical outer formwork 2, and the rotating shaft 5 passing through the formwork 1 is circumscribed by the formwork rings 3 and 4 to form the form. While suspending the frame 1, the rotational force is transmitted to the formwork rings 3 and 4 to rotate the formwork 1, and the concrete material supplied to the formwork 1 is affected by the centrifugal force caused by the rotation and the rotation of the rotating shaft 5 against the concrete material. In a method of manufacturing a concrete pipe by pressure, the inner diameter 3a of one form ring 3 is made larger than the inner diameter 4a of the other form ring 4, and the large diameter part 3a and the small diameter part 4a form an oblique truncated cone shape. Production of a concrete pipe with a slanted wall, characterized in that a wall form 1 is formed, and the slanted wall form 1 is suspended with the rotating shaft 5 tilted and the large diameter portion 3a positioned upward. Method. (2) A formwork 1 for a sloped wall formed by fixing formwork rings 3 and 4, one of which has an inner diameter 3a larger than the other inner diameter 4a, to both ends of a cylindrical outer formwork 2, and this formwork 1 for a sloped wall. is suspended with the large-diameter portion 3a of the formwork ring located above, and transmits rotational force thereto; a drive device 6 for rotating this tilted rotation shaft 5; and a tilted rotation shaft 5 and A concrete pipe with a slanted wall characterized by comprising a movable base 7 that tiltably supports a drive device 6, and support rolls 8 and 9 that support the upper and bottom parts of the outer peripheral surface of the slanted wall formwork 1. Manufacturing equipment.