JPS5832621B2 - Centrifugal lining method for straight pipes with branch pipes - Google Patents

Description

[Detailed Description of the Invention] Centrifugal lining method is the first method for lining straight pipes with branch pipes with mortar! Conventionally, this has been done by hand, or by cutting the branch pipe, lining it, and then welding it to the main pipe again. In addition to being labor-intensive and time-consuming, the quality of the lining is not sufficient and the mechanical strength is compromised, and on-site welding is required, which reduces work efficiency and is inconvenient.

The present invention has been devised to eliminate such inconveniences, and examples thereof will now be described.

A plug-type jig 2 with a thickness equal to the thickness of the lining and the same length as the iron pipe is inserted and fitted into the first process branch pipe 1, and the fitting is The top plate 2' is attached to the flange 1' of the branch pipe and fixed with bolts 3.

The outside of the second process main pipe 4 and branch pipe 1 are tied together with an iron plate band 6,
A balance weight 5 is attached to the side of the band at a position symmetrical to the branch pipe.

Third step: In a known method, driving tires 8 and driven tires 9, which have received rotation from the prime mover 7, are arranged side by side, and the main pipe 4 is placed on top of both tires, and as they rotate, mortar is injected from the main pipe opening. Mortar adheres to the inner surface of the pipe due to centrifugal force, and the gap between branch pipe 1 and jig 2 is filled with mortar.

Fourth step: By removing the band 6, the balance weight 5 is removed, and the jig 2 is extracted from the branch pipe 1.

In this way, mortar lining is applied to the inner surface of the main pipe 4 and the inner surface of the branch pipe 1.

According to this method, the inner surface of the main pipe and the inner surface of the branch pipe are simultaneously lined by the centrifugal lining method, which makes the work extremely easy and quick without requiring any effort.

Since there is no need to manually paint the branch pipes or cut and weld the branch pipes as in the past, labor is saved and the mechanical strength is not damaged.

The main pipe and branch pipes are uniformly and robustly lined, improving quality.

As mentioned above, according to this method, the efficiency of lining work is significantly improved and a product of good quality and high mechanical strength can be obtained.

[Brief explanation of drawings]

The drawings show the implementation of the method, and FIG. 1 is a plan view of the main pipe, FIG. 2 is a left side view of the main pipe, and FIG. 3 is a longitudinal sectional view of the branch pipe. 1 is a branch pipe, 2 is a jig, 4 is a main pipe, and 5 is a balance weight.

Claims (1)

[Claims] 1. Insert and fit into the branch pipe 1 a plug-type jig 2 with a thickness equal to the thickness of the lining and the same length as the iron pipe, leaving a gap equal to the thickness of the lining between the inner wall of the iron pipe and the top plate 2'. is attached to the fringe 1' of the iron pipe and fixed with bolts 2 to close the iron pipe, and at the same time, a balance weight 5 is attached to the symmetrical side of the main pipe 40 to the side of the main pipe 40, and then the main pipe is closed using a known method. By injecting mortar into the tube and at the same time rapidly rotating it, the mortar is attached to the inner surface of the tube and the gap between the branch pipe 1 and the jig 2 is filled with mortar, and then the jig and balance weight are removed. Centrifugal lining method for steel pipes with branch pipes.