JPS6022971A - Method for lining on inside surface of cast iron pipe - Google Patents

Abstract

PURPOSE:To reduce the centrifugal force on a cast iron pipe and to provide reduction in initial cost and simplification of production stage by driving rotationally the cast iron pipe under the slight oscillation applied thereon. CONSTITUTION:When a cast iron pipe 15 is rotated by a driving roller 11, the surface of the pipe 15 having slight ruggedness and rollers 11, 14 formed of a steel contact directly and since the rotating force is transmitted by such contact, a moderate slight oscillation is applied on the pipe 15. Lining is made possible with about 20-25G centrifugal force. The reduction in the driving power for rotation is thus made possible.

Description

[Detailed description of the invention] The present invention relates to a method for lining the inner surface of an iron pipe.

When a cast iron pipe formed by centrifugal lock making is used as a water pipe, a cement mortar lining 1 is formed for the purpose of corrosion prevention. When forming this lining layer, it is customary to rotate the cast iron pipe around its axis at high speed and cause the mortar material projected into the pipe to stick to the inner surface of the pipe by centrifugal force.

Conventionally, in order to rotate a cast iron pipe around its axis, as shown in FIG. 3) The drive roller (1) is installed on the
) is rotated to rotate a cast iron pipe (5) supported by both rollers (1) and (2,). Here, (6) is a pressing roller that presses the cast iron pipe (5) from above. Alternatively, although not shown, there is a method in which an annular steel tire is attached to the outer periphery of a cast iron pipe, and the cast iron pipe is supported and rotated by unnecessary rollers coated with an adhesive.

However, in such conventional products, there is a problem in that in order to solidify the oning layer densely, a very high centrifugal force of, for example, about 60 G must be applied to the cast iron pipe. Furthermore, in the case shown in Figure 1,
Since the cast iron pipe (5) is rotated on elastic rollers (1) and (2), a suppression roller (6) to prevent lateral vibration is essential, and the above-mentioned annular steel tire is also used. However, there is a problem in that it requires a process to attach and detach this annular copper tire.

Therefore, the present invention proposes a method for lining the inner surface of a cast iron pipe that reduces the centrifugal force that should be applied to the cast iron pipe, eliminates the need for suppressing rollers, and eliminates the process of attaching and detaching the annular tire. The purpose is to reduce equipment costs and simplify the manufacturing process.

In order to achieve this objective, the present invention focuses on the fact that the centrifugal force to be applied to a pipe can be reduced to 20 to 25 G by applying moderate vibrations to the pipe. It is supported by a metal rotating roller that is in direct contact with it and is rotated while applying slight vibrations.

Therefore, the slightly uneven surface of the cast iron pipe and the metal rotating roller come into direct contact and the rotational force is transmitted.
Appropriate micro-vibration is applied to the pipe, making it possible to perform lining with a centrifugal force of about 20 to 25 G. This not only makes it possible to reduce the size of the rotational power, but also allows for the installation of pressure rollers and the annular shape. This makes it possible to eliminate the need for the process of attaching and detaching steel tires, thereby reducing equipment costs and simplifying the manufacturing process.

The present invention will be explained in detail below. In FIG. 2, 0 is a steel drive roller provided on the bed (2), which is rotated by a motor 1.

04 is a steel idling roller arranged in parallel with the drive roller Qυ, and is configured such that the distance from the drive roller 00 is variable. Further, OQ is a cast iron pipe whose inner surface is to be provided with a lining layer, and is supported in contact with both rollers Ql) (11'1).

The distance between the drive roller α◇ and the idle roller 04 is determined by the line ("i 'J
The angle formed by 'h (hereinafter referred to as the support angle) is 60 to 180
It is adjusted so that the In other words, the support angle 0 frame is 6
If it is smaller than 0 degrees, this pipe 01i will be moved by the roller θ9θ due to the deflection of the pipe 0→ that occurs during lining construction.
If the angle exceeds 180 degrees, the frictional resistance between the roller (11) CDI and the pipe (11!) will increase and there is a risk of damaging the surface of the pipe.Therefore, the support angle (G) must be set at 60 to 180 degrees, preferably 90 to 120 degrees.

When the cast iron pipe a0 is rotated by the WBiIJl roller 0, the surface of the cast iron pipe QI, which has slight irregularities, comes into direct contact with the steel roller 0υ04, and the rotational force is transmitted, so a moderate vibration is generated in the woe. The lining can be applied with a centrifugal force of about 20 to 25 G.

According to this, compared to conventional elastic rollers and annular steel tires that cannot generate slight vibrations,
The rotational speed of the Qυ can be significantly reduced, and the rotational power, that is, the motor can be made into a mountain shape.

Next, the present invention will be explained in detail. The pipe for lining construction is provided with a diameter of 600 to 1600 ff and a length of 6 m or 9 m. Furthermore, in the following, a two-stage, one-stage method in which two wooden pipes are constructed alternately will be explained.

(Specific example 1) Diameter 600 Fit, length 9 F77 Ductile pipe product M amount 10001 cg Support angle 120 degrees Centrifugal force 20 G Construction time 51 minutes (total of 2 stages) (Specific example 2) Diameter 110 (ljl, length 9 m) Ductile pipe product weight 8400 kg Support angle 100 degrees centrifugal force 21 G Construction time 8 minutes (total of 2 stages) (Example 8) Diameter 1000 + 1 Jll, length 6 m Ductile pipe product weight 2000 kg Support angle 110 degrees centrifugal force 25 G Construction time: 7 minutes (total of 2 stages) As described above, according to the present invention, the following advantages can be obtained when compared with, for example, the conventional method of constructing a lining with an annular steel tire. .

(a) The number of construction pieces per hour has doubled, increasing productivity by 200%.
%.

(b) There is no need for an annular tire, and there is no need for a place to store it.

As described above, according to the present invention, a cast iron pipe surface having slight irregularities and a metal rotating row 2. Since the rotational force is transmitted through direct contact with the pipe, suitable microvibrations are applied to the pipe, making it possible to perform lining construction even with a centrifugal force of about 20 to 25 G, making it possible to reduce the size of the rotational power. Not only is this possible, but the installation of a suppression roller and the process of attaching and detaching a circular steel tire, which are conventional, can be made unnecessary, and various equipment costs can be reduced and the manufacturing process can be simplified.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional example, and FIG. 2 is a diagram showing an embodiment of the present invention. (Jρ...Jukou roller (rotating roller made by Kinsho), 0◆
...Idle roller (metal rotating roller), So...Cast iron pipe, 0 Enoki...Support angle agent Yoshihiro Morimoto Figure 1 Figure 2 Figure 5

Claims (1)

[Claims] 1. When rotating a cast iron pipe around its axis and attaching the lining layer projected into the pipe to the inner surface of the pipe using centrifugal force,
A method for lining the inner surface of a cast iron pipe, which is characterized in that the Rial cast iron pipe is supported by a metal rotary roller that is in direct contact with the cast iron pipe and rotated while applying slight vibrations.