JPH08224543A - Production of lining pipe - Google Patents

Abstract

PURPOSE: To easily form an uneven shape part such as an inner gear shape part on the inner periphery of a pipe of every kind having any caliber or length. CONSTITUTION: A gear shape forming jig 10 having a gear shape part 10a formed to the outer periphery thereof and a mortar supply pipe are inserted in a pipe 1 up to the end part thereof and the gear shape forming jig 10 is pulled out of the pipe 1 by a support rod 11 while the pipe 1 is rotated to be filled with a lining material 2'. By this constitution, the gear shape forming jig 10 is tumbled on the lining material 2' accompanied by the rotation of the pipe 1 and the movement of the pipe 1 in the pipe axis direction to form a lining layer 2 having an inner gear shape part 3 on the entire inner peripheral surface of the pipe 1. By this constitution, the lining layer 2 having the inner gear shape part 3 can easily be formed on the inner periphery of the pipe 1 regardless of the caliber or length of the pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing 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 production of hydrogen sulfide in wastewater is
It is generated by the reduction of inorganic sulfur compounds (sulfate, sulfate ion) by sulfate reducing bacteria. Therefore, in sewage such as sewage containing organic substances, sulfates, and sulfate-reducing bacteria, when dissolved oxygen is consumed and an anaerobic environment is formed, conditions for generating hydrogen sulfide are satisfied. Become.

When sewage flows down with a free surface, oxygen is constantly supplied from the atmosphere, and it is difficult to form a sufficiently anaerobic environment in running water. Moreover, even in the sewer pipe that flows naturally, the water will not become full, so it is unlikely to be completely anaerobic. Therefore,
Hydrogen sulfide is less likely to be generated, and in the presence of dissolved oxygen, microorganisms adhering to the inner surface of the pipe decompose organic matter to exert a certain degree of sewage purification function.

On the other hand, in recent years, it has been proposed to construct a relay pumping station on a flat terrain or a hilly area to pump sewage under pressure. In the sewage pumping pipe,
Since there is no oxygen supplement source, it is often in an absolute anaerobic state, and the conditions for generating hydrogen sulfide are far more satisfied than in the sewer pipe under natural flow. As described above, hydrogen sulfide is generated by becoming anaerobic in the sewage pumping pipe, and accordingly, the problem of odor and the problem of corrosion become apparent.

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

However, a ductile cast iron pipe is usually used as the sewage pumping pipe for reasons of strength, and a cement lining is centrifugally applied to the inner surface of the pipe to prevent corrosion. Therefore, the inner surface of the pipe is smooth and has a simple tubular shape, and since the surface area on which microorganisms are immobilized is small, there is a problem that the purification capacity is low even if the sewage is agitated and re-aerated.

As a solution to this problem, as shown in FIGS. 3 (a) and 3 (b), it is conceivable to form an internal gear 3 on the inner lining layer 2 of the pipe 1. .
According to this lining pipe 4, since the inner periphery of the pipe 1 has an uneven shape due to the internal gear portion 3, the surface area on which microorganisms are immobilized is increased, and the purification capacity can be improved.

[0008]

As a method of forming the internal gear shape portion 3 on the inner circumference of the pipe 1 as described above, for example, a die whose outer peripheral surface corresponds to the internal gear shape portion 3 is used. It is conceivable to form a frame, dispose this form in a vertically arranged pipe, and fill a lining material between the form and the pipe.

However, according to this method, since the mold is manufactured in advance according to the diameter and length of the pipe 1, if the diameter and length of the pipe 1 are different, a mold suitable for the pipe 1 is used. It has to be remanufactured separately, which takes a lot of time and effort.

The present invention is to solve the above-mentioned problems, and even for a plurality of types of pipes having different diameters and lengths, it is possible to easily form a concavo-convex portion such as an internal gear shape on the inner circumference of the pipe. It is an object of the present invention to provide a method of manufacturing a lining pipe that can be performed.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention rotatably supports a concavo-convex forming jig having a smaller diameter than the pipe and having concavo-convex portions formed on the outer periphery, and the pipe is rotated. The inner circumference of the pipe is filled with a fluid lining material, and the filling portion is rolled while abutting the unevenness forming jig from the inside of the pipe and relatively moved in the axial direction of the pipe. By doing so, the lining layer having the uneven portion is formed on the inner circumference of the tube.

[0012]

According to the above method, the lining having the uneven shape portion is formed by rolling the jig while making the jig for contacting the unevenness contact with the filling portion of the lining material and moving it relatively to the axial direction of the pipe. The layers can be formed on the inner circumference of the tube without regard to its diameter or length.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The lining pipe 4 shown in (a) and (b) of FIG.
The inner lining layer 2 of the pipe 1 has an internal tooth gear shaped portion 3 as an uneven portion formed on the lining layer 2 and is used, for example, as a sewage pumping pipe. When this lining pipe 4 is used as a sewage pumping pipe, the inner peripheral surface of the pipe 1 becomes uneven due to the internal gear 3 so that the surface area on which microorganisms are immobilized is increased and the purification capacity is improved. You can

The lining pipe 4 is manufactured as follows. First, a gear shape forming jig as a concave and convex forming jig used during manufacturing will be described. The gear shape forming jig 10 has a substantially cylindrical shape, and the gear shape portion 10 is provided on the outer periphery thereof.
a is formed, and is rotatably supported by a support rod 12 that is suspended from a support rod 11 that extends in the horizontal direction in a posture in which its axis is arranged in the horizontal direction. Further, a mortar supply pipe 13 for supplying the solidified mortar as a lining material is arranged in the vicinity of the support rod 11 of the gear shape forming jig 10. The mortar supply pipe 1
3 is moved together with the support rod 11 in the tube axis direction by a drive device (not shown). Further, reference numeral 8 in FIG. 1 denotes a pair of rotary rollers, and these rotary rollers 8 rotate the tube 1 about the tube axis.

When forming the lining layer 2 on the inner circumference of the pipe 1, first, the support rod 11 supporting the gear shape forming jig 10 and the mortar supply pipe 13 are inserted to the end side inside the pipe 1. Then, while the pipe 1 is rotated around the pipe axis by the rotating roller 8, the mortar supply pipe 13 fills the inside of the pipe 1 with mortar as the lining material 2 ′, while the support rod 11 gears the gear. Shape forming jig 1
Pull out 0 at low speed. At this time, the support rod 11 is arranged so that the gear shape forming jig 10 abuts on the lining material 2 ′ filled inside the pipe 1, whereby the pipe 1 rotates and moves in the axial direction of the pipe 1. As a result, the gear shape forming jig 10 rolls on the lining material 2 ′, and as shown in FIG. 1, the lining layer 2 having the internal gear shape 3 is formed on the entire inner peripheral surface of the pipe 1. It After this, the tube 1 is allowed to stand and the lining material 2'is cured.

As described above, since the gear shape forming jig 10 is brought into contact with the filling portion of the lining material 2'to roll, and is moved relative to the axial direction of the pipe 1, A lining layer 2 having an internal gear 3
It can be easily formed on the inner circumference of the tube 1 regardless of the diameter or length of the tube 1.

In this embodiment, the case where the concavo-convex shape of the lining layer 2 is the internal gear shape has been described.
The shape is not limited to this, and may have other uneven shapes. Further, in this embodiment, the case where the lining pipe 4 is used as the sewage pressure feeding pipe has been described, but the present invention is not limited to this.

[0018]

As described above, according to the present invention, the unevenness forming jig having the unevenness formed on the outer circumference is rotatably supported, and the tube is rotated so that the inner circumference of the tube has fluidity. A lining layer having an uneven shape portion is formed by filling the lining material and rolling it while bringing the jig for forming the unevenness into contact with the filled portion and moving the jig relatively to the axial direction of the pipe. It can be easily formed on the inner circumference of the tube regardless of the diameter and length of the tube.

[Brief description of drawings]

FIG. 1 is a side view showing a manufacturing process of a lining pipe according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a manufacturing process of the lining pipe.

3 (a) and 3 (b) are a side view and a perspective view seen obliquely from the front of the lining pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 pipe 2 lining layer 2'lining material 3 internal gear shape part 4 lining pipe 8 rotating roller 10 jig for forming gear shape (jig for forming unevenness) 11 support rod 13 mortar supply pipe

Claims (1)

[Claims] 1. A manufacturing method for forming a concavo-convex lining layer on the inner circumference of a pipe, wherein a concavo-convex forming jig having a concavo-convex portion formed on the outer periphery and having a diameter smaller than that of the pipe is rotatably supported, Is rotated to fill the inner circumference of the pipe with a lining material having fluidity, and at the filling location, the unevenness forming jig is rolled while abutting from the inside of the pipe and with respect to the axial direction of the pipe. A method for manufacturing a lining pipe, characterized in that a lining layer having an uneven portion is formed on the inner circumference of the pipe by relatively moving.