JP3049635B2 - Manufacturing method of lining pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a lining pipe suitable for a sewage pumping pipe for pressurizing and pumping sewage such as sewage.

[0002]

2. Description of the Related Art Generally, the generation of hydrogen sulfide in wastewater is as follows.
It is caused by reduction of inorganic sulfur compounds (sulfate, sulfate ion) by sulfate reducing bacteria. Therefore, in sewage such as sewage containing organic matter, sulfate, and sulfate-reducing bacteria, when dissolved oxygen is consumed and an anaerobic environment is formed, the condition for generating hydrogen sulfide is satisfied. Become.

When sewage flows down with a free surface, oxygen is always supplied from the atmosphere, so that a sufficiently anaerobic environment is hardly formed in flowing water. Also, the sewage pipe under the natural flow does not become full, so it is unlikely to be completely anaerobic. Therefore,
There is little danger of generating hydrogen sulfide, and in the presence of dissolved oxygen, organic substances are decomposed by microorganisms attached to the inner surface of the pipe, and the sewage purification function is also exerted to some extent.

On the other hand, in recent years, it has been proposed to construct a relay pumping station on flat terrain or hills and to pump sewage by pumping. In the sewage pumping pipe,
Since there is no oxygen supply source, they are often in an absolute anaerobic state, and the conditions for generating hydrogen sulfide are far more satisfied than those of sewer pipes flowing down naturally. As described above, the sewage pressure pipe becomes anaerobic, thereby generating hydrogen sulfide, and accordingly, the problem of odor and the problem of corrosion become apparent.

[0005] In order to solve the problem of the generation of hydrogen sulfide in the sewage pumping pipe, it has been proposed to inject air directly into the sewage pumping pipe and pump the sewage as a gas-liquid two-phase flow. In other words, the generation of hydrogen sulfide is suppressed by pumping the sewage in the pipe while stirring and re-aeration,
In addition, microorganisms adhering to the sewage and the inner surface of the pipe decompose organic substances to promote purification of the sewage.

However, ductile cast iron pipes are often used for sewage pumping pipes for strength reasons, and a cement lining is centrifugally applied to the inner surface thereof to prevent corrosion. For this reason, the inner surface of the tube is smooth and has a simple cylindrical shape, and the surface area on which the microorganisms are immobilized is small. Therefore, there is a problem that the purification ability is low even if the sewage is stirred and re-aerated.

As a countermeasure against this problem, as shown in FIGS. 3A and 3B, it is conceivable to form an internal gear shape portion 3 in the lining layer 2 on the inner periphery of the tube 1. .
According to the lining tube 4, since the inner periphery of the tube 1 is made uneven by the internal gear shape portion 3, the surface area on which the microorganisms are immobilized increases, and the purification ability can be improved.

[0008]

As a method for forming the internal gear-shaped portion 3 on the inner periphery of the pipe 1 as described above, for example, a lining material is applied to the inner periphery of the pipe by centrifugal force, and the inner surface of the pipe is formed. After a smooth and simple cylindrical lining layer is formed, a cutting device for cutting a portion corresponding to one tooth space portion is arranged in the pipe, and the cutting device is moved along the axis of the pipe while driving the cutting device. By cutting one tooth space part,
Thereafter, it is conceivable to repeat the cutting operation again by rotating the cutting tooth surface of the cutting device by the pitch around the pipe axis.

However, according to this method, much labor and time are required, so that the work efficiency is reduced.
An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method for manufacturing a lining pipe capable of easily and reliably forming an uneven portion such as an internal gear shape on the inner periphery of the pipe. is there.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method for forming an uneven lining layer on the inner periphery of a tube, the method comprising: erecting the tube on a mounting table; A jig having an uneven portion is set in a pipe, a lining material having fluidity is filled in the pipe, and the jig is moved upward along the axis of the pipe while vibrating the jig to form an uneven shape. A lining layer having a portion is formed on the inner periphery of the pipe, and the lining layer is cured.

[0011]

According to the above-mentioned method, a lining layer having an uneven portion is formed on the inner periphery of the pipe by a simple operation of moving the jig set in the pipe once upward along the axis of the pipe. Work and time can be minimized, and work efficiency is improved.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. The lining tube 4 shown in FIGS.
The internal gear 3 is formed on the lining layer 2 on the inner circumference of the pipe 1 and is used as, for example, a sewage pumping pipe. When this lining pipe 4 is used as a sewage pumping pipe, the internal gears 3 make the inner circumference of the pipe 1 uneven, so that the surface area on which microorganisms are immobilized increases and the purification ability is improved. Can be.

The lining tube 4 is manufactured as follows. First, as shown in FIG. 1A, the tube 1 is erected on a mounting table 5 and a jig 6 is set at a central portion in the tube 1.

The jig 6 is shown in FIGS. 2A and 2B.
As shown in the figure, a gear-shaped portion 7 is formed as an uneven portion provided with teeth 7a at a predetermined pitch on the outer peripheral surface, and its axial direction end side is narrowed to a conical shape. A small vibrator 9 is built in 8. The jig 6 has a centering guide 10 protruding from the tip of the conical portion 7 along the axial center direction. The centering guide 10 is inserted into an insertion hole 10a of the centering guide 10 as shown in FIGS. 1 (a) and 1 (b). As shown, a centering rod 11 arranged at the axis of the tube 1 is inserted. That is, by pulling up the drawer string 12 suspended at the tip of the conical portion 7, the jig 6
Is coaxial with the tube 1 and can be pulled out.

After setting the jig 6 in the pipe 1,
As shown in FIG. 1A, a pipe 1 is filled with a lining material 2 ′ made of hardened concrete mortar, and a jig 6 is vibrated by a vibrator 9 to form a lining material 2 ′.
Is moved upward along the tube axis direction while improving the fluidity of the tube (see FIG. 1B). Thereby, the lining layer 2 having the internal gear portion 3 is formed on the inner periphery of the pipe 1.

When the jig 6 is pulled out of the tube 1, excess lining material 2 'protrudes from the end of the tube 1. Therefore, the protruding lining material 2' is removed, and thereafter, the lining material 2 'is hardened. Let stand still.

As described above, after setting the jig 6 in the pipe 1 and filling the lining material 2 ', a simple operation of moving the jig 6 upward once along the pipe axis direction is performed. so,
The lining layer 2 having the internal gear-shaped portion 3 can be formed on the inner periphery of the pipe 1, so that labor and time can be minimized.

In this embodiment, the case where the unevenness of the lining layer 2 is an internal gear is described.
However, the present invention is not limited to this, and it goes without saying that the lining tube 4 can be manufactured in a similar manner even if the uneven shape is other. In this embodiment, the case where the lining pipe 4 is used as a sewage pumping pipe has been described, but the present invention is not limited to this.

[0019]

As described above, according to the present invention, the pipe is erected on the mounting table and the jig having the uneven surface formed on the outer peripheral surface is set in the pipe, and the lining material having fluidity is placed in the pipe. The jig is moved upward along the axis of the tube while vibrating the jig to form a lining layer having an uneven portion on the inner periphery of the tube, and the lining layer is cured. The lining tube can be manufactured while minimizing labor and time, thereby improving work efficiency.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are cross-sectional views showing steps of manufacturing a lining pipe according to one embodiment of the present invention.

FIGS. 2A and 2B are a front view and a plan view of a jig used for manufacturing the lining tube.

FIGS. 3 (a) and 3 (b) are a side view and a perspective view of the lining tube as viewed obliquely from the front.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Lining layer 2 'Lining material 3 Internal gear shape part (irregular shape part) 4 Lining pipe 5 Placement table 6 Jig 7 Gear shape part (irregular part) 9 Vibrator 10 Centering guide 11 Centering rod

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05D 1/00-7/26 B05C 7/08 E03F 5/00 F16L 11/11 F16L 58/02

Claims (1)

(57) [Claims] 1. A manufacturing method for forming an uneven lining layer on the inner periphery of a tube, wherein the tube is erected on a mounting table and a jig having an uneven surface formed on an outer peripheral surface is set in the tube. Filling the pipe with a lining material having fluidity, moving the jig vibrating upward along the pipe axis direction while vibrating the jig, forming a lining layer having an uneven portion on the inner circumference of the pipe, A method for producing a lining tube, comprising curing a lining layer.