JPH0529847Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention relates to improvements in manufacturing equipment for concrete pipes used for water and sewage pipes, gas pipes, power transmission lines, etc.

[Conventional technology]

Conventionally, in the production of this type of concrete pipe, as disclosed in Japanese Utility Model Publication No. 52-55489, a concrete pipe is placed at both ends of a cylindrical formwork that can be divided into two semi-cylindrical parts. A ring edge frame is installed to regulate the wall thickness of the ring frame, a pair of flanged rotating shafts are fitted eccentrically inside the formwork to support the formwork, and these rotating shafts are rotated by a drive device.
The rotation is transmitted to the formwork through the ring edge frame by friction, the ready-mixed concrete is supplied into the rotating formwork, and the centrifugal force forces the ready-mixed concrete to adhere to the inner wall of the formwork to form the desired concrete. Trying to get a tube.

[Problem that the idea aims to solve]

By the way, in the above-mentioned conventional manufacturing technology, in order to manufacture concrete pipes by pressing fresh concrete against the inner wall surface of the formwork only by the action of centrifugal force due to the rotation of the formwork, it is necessary to obtain a predetermined pouring hardness (compact density). It takes a long time (approximately 30 minutes) to prepare the concrete, making it difficult to work with.In addition, there are many voids inside and outside the concrete layer, which not only weakens its strength, but also does not look good. There is a problem in that it lowers the product value. Therefore, the purpose of this invention is to completely eliminate the problems of the prior art described above and to provide an apparatus that can efficiently produce a concrete pipe with no voids and high strength.

[Means and actions for solving the problem]

In order to achieve the above object, the concrete pipe manufacturing apparatus characterized by this invention supports the formwork by inserting a pair of rotating shafts into a cylindrical formwork with ring edge frames attached inside both ends, In an apparatus for manufacturing a concrete pipe by rotating a formwork using these rotating shafts, the pair of rotating shafts are used as tubular shafts, and eccentric shafts are rotatably disposed within each tubular rotating shaft, The mold is configured to be rotated and vibrated simultaneously by the rotating shaft. According to this manufacturing device, by rotating the pair of rotating shafts and simultaneously rotating the eccentric shaft built into the rotating shafts, each rotating shaft rotates and vibrates with a constant amplitude and period. The rotation and vibration are transmitted to the formwork through the ring frame, and the fresh concrete supplied into the formwork is pressed against the inner wall of the formwork by the centrifugal force caused by the rotation of the formwork, and at the same time, the vibration causes minute vibrations. It is shaken and refined.

【Example】

Embodiments of this invention will be described below with reference to the accompanying drawings. 1 is a cylindrical formwork with the required length and diameter;
It is structured so that it can be divided into parts, and ring frame frames 2 and 3 that regulate the wall thickness of the concrete pipe Cp are fixed to the inside of both ends with fixing means such as bolts. As shown in Fig. 2, two rotating shafts S and S arranged at the same height and at a certain interval are fitted eccentrically and penetratingly into the inside as shown in Fig. 2. The part is ring frame 2,
The mold 1 is rotatably supported by contacting the inner circumferential surface of the mold 3. The two rotating shafts S, S are each configured as follows. That is, as shown in FIG. 1, the rotation axis S mainly has a tubular main shaft 4 that passes through the formwork 1 and extends to one side (right side in the figure) of the formwork 1. Ring-shaped flanges 6a and 6b having an L-shaped cross section are located at positions corresponding to both ends of the formwork 1, that is, at the tip and center.
is fixed to it to restrict the lateral movement of the formwork 1, and between the flanges 6a and 6b is a tubular sub-shaft having a diameter slightly larger than that of the tubular main shaft 4 and approximately equal to the length of the formwork 1. A shaft 5 is fitted and connected, and this tubular countershaft 5 is in contact with the inner surfaces of the ring edge frames 2 and 3 at both ends of the formwork 1. This configuration prevents wear of the tubular main shaft 4 due to contact with fresh concrete, and is convenient because only the short tubular sub-shaft 5 needs to be replaced. However, this tubular sub-shaft 5 is not necessarily It does not need to be provided. On the other hand, the portion of the tubular main shaft 4 that extends laterally from the formwork 1 is rotatably supported by a ball bearing 7a enclosed in a pair of bearing boxes 7, 7 arranged at a predetermined interval on the left and right. Further, each bearing box 7, 7 is supported on a machine frame 9 via a vibration isolating member 8 made of rubber or the like. Eccentric shafts 10 each having one end protruding from the tubular main shaft 4 are installed in the above-mentioned overhanging portion of the tubular main shaft 4 along the axis line except for both ends. is connected to the tubular main shaft 4 by a pair of ball bearings 11 installed in the tubular main shaft 4.
It is rotatably supported separately from the A V-pulley 12 is attached to the end of one tubular main shaft (the one shown in FIG. 1) 4, and this V-pulley 12 is driven by a first drive motor (not shown) via a belt. . And V pulley 1
A sprocket 13 rotatably fitted onto the overhang of the eccentric shaft 10 via a sleeve 13a is integrally connected to the side surface of the eccentric shaft 10, and the other tubular main shaft 4 is connected via the sprocket 13 and the chain. It is designed to rotate in the same direction and at the same speed as the one tubular main shaft 4. Further, another V is provided at the shaft end of the eccentric shaft 10 incorporated in the pair of left and right tubular main shafts 4.
Pulleys 14 (only one pulley is shown in Figure 1) are each mounted and rotated in opposite directions at the required speed via a belt and gears by a second drive motor (not shown). The horizontal vibrations caused by the eccentric weights of each eccentric shaft 10 are canceled out. Furthermore, inside each tubular main shaft 4, an eccentric shaft 1
Spacer pipes 15b and 15a are fitted between a pair of ball bearings 11 that rotatably support the mold 1, and between a seal block 16 mounted from the central ball bearing 11 into the side end of the formwork 1. On the overhanging portion of the tubular main shaft 4, spacer pipes 16a and 16b are provided between the central flange 6b and the left bearing box 7, between the left and right bearing boxes 7, and between the right bearing box 7 and the V-pulley 12, respectively. ，
16c is fitted. In addition, in the figure, 17 is an end plate fixed to the tubular main shaft 4, and 18 and 19 are bearing boxes 7.
and an oil seal built into the boss portion of the sprocket 13. In the above configuration, the first drive motor is driven to rotate the pair of rotating shafts S via the V pulley 12 and the sprocket 13, and at the same time, the second drive motor is driven to rotate each rotation via the gear and the V pulley 14. When the eccentric shafts 10 incorporated in the shaft S are rotated in opposite directions, the two rotating shafts S rotate in the same direction at the required speed and vibrate in the vertical direction with a constant amplitude and period. do. The rotation and vibration are then transmitted to the formwork 1 via the ring frame frames 2 and 3 that are in contact with the two rotating shafts S. If fresh concrete is supplied into the formwork 1 in this state, the fresh concrete will be pressed and adhered to the inner wall surface of the formwork 1 due to the centrifugal force caused by the rotation of the formwork 1, and vibrations transmitted to the formwork 1. The inside of the concrete layer is shaken finely and becomes denser.
A concrete pipe Cp of constant hardness without voids is formed in a short time (10-15 minutes). After that,
The concrete pipe Cp is removed along with the formwork 1 from the rotating shaft S and left as is for a certain period of time, or placed in a steam curing chamber or the like to harden the concrete.
Moreover, the formwork 1 is removed after the concrete pipe Cp hardens.

[Effect of the idea]

This idea is as described above, and is a concrete pipe manufacturing device of the type in which a cylindrical formwork with ring edge frames attached inside both ends is supported by a pair of rotating shafts, and the formwork is rotated. The rotating shafts are tubular shafts, and the eccentric shafts are rotatably disposed inside the tubular shafts.The simultaneous rotation of the rotating shafts and the eccentric shafts imparts rotation and vibration to the formwork. The supplied fresh concrete is pressed against the inner wall surface of the formwork by the action of centrifugal force, and the concrete is densified by the vibration of the formwork, so that a concrete pipe of the required hardness can be formed in a short time. Concrete pipes with excellent strength and high commercial value can be manufactured without creating voids.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side sectional view, FIG. 2 is an end view taken along line A-A in FIG. 1, and FIG. 3 is a view taken along line B-B in FIG. 1. FIG. In the figure, 1 is a formwork, 2 and 3 are ring frame frames, 4 is a tubular main shaft, 6a and 6b are flanges, 7 is a bearing box, and 7
a is a ball bearing, 8 is a vibration isolation member, 10 is an eccentric shaft, 11 is a ball bearing, 12 and 14 are V
A pulley, 13 is a sprocket, and S is a rotating shaft.

Claims (1)

[Scope of utility model registration request] In an apparatus for producing a concrete pipe by inserting a pair of rotating shafts into a cylindrical formwork with ring edge frames attached inside both ends to support the formwork, and rotating the formwork by these rotating shafts, the above-mentioned The pair of rotating shafts are tubular shafts, and eccentric shafts are rotatably disposed within each tubular rotating shaft, so that the formwork is rotated by the rotating shafts and simultaneously vibrated. Concrete pipe manufacturing equipment.