JPH11270758A - Spiral-tube producing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral-tube producing material that has higher flexibility facilitating tube arrangement including inflections and has higher internal-surface smoothness. SOLUTION: A spiral-tube producing material 1 has an engaging piece 2 and an engaging groove 3 in the respective side edges of its cross section, which are connected by a main body part 4 integrally connected with curving elements 41 curved like bellows. The portions 42 of these curving elements 41 for defining the interior surface of a spiral tube are made roughly flush with one another and made adjacent one to the next.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubing material (hereinafter, simply referred to as "tubing material") for spirally winding a helical tube to form a helical tube.

[0002]

2. Description of the Related Art When existing water and sewage pipes are deteriorated,
A pipe-making machine is installed on the inner surface of those existing sewers, and a long strip-shaped pipe-forming material is continuously fed into the pipe-making machine and spirally wound,
A technique for rehabilitating an existing culvert by forming a spiral pipe by engaging adjacent side edges and lining the pipe is disclosed by the present applicant (see JP-A-8-261363). The spiral pipe is used not only for rehabilitation of an existing sewer but also for the purpose of newly constructing a sewer.

[0003] The tube-forming material used for the above purpose is not particularly limited, and various synthetic resins or metal materials can be used.
From the viewpoints of strength, cost and the like, hard vinyl chloride resin is particularly suitable and widely used. As shown in FIGS. 3 and 4, the tube material has a main body formed into a straight, smooth cross-sectional shape. Therefore, the spiral pipe made of these pipe-forming materials has a low flow resistance because the inner surface is smooth, and requires less pump power when used as a pressure feed pipe. In addition, when used as a drain pipe or a sewer pipe, the scavenging property is good, and stagnation or clogging of foreign matters is unlikely to occur even if the pipe gradient is small.

[0004] However, in general, the sewer is located at the ends of the existing sewer in relation to the arrangement of structures and equipment at both ends to be connected, the state of roads and rivers, the underground buried objects, the ground, and the like, or in the case of the existing sewer rehabilitation. Due to restrictions such as the need to make pipes, the pipes are not always arranged in a straight line, and are often provided with bent portions. In order to perform piping with such a bent part, joints such as bends and special pipes may be used, but it is expensive because it is necessary to make and have a special curvature radius and length,
In addition, since the joint or special pipe is brought into a narrow space or the connection work is troublesome, the construction may be rather troublesome. In such a case, unless the radius of curvature is particularly small, it is often easier and more economical to pipe the pipe itself by "slanting" it.

However, the conventional tube material a1 as shown in FIG. 3 and the conventional tube material a2 as shown in FIG. 4 have a straight body part b1 and b2, a large thickness, and are flexible. It is difficult to bend because there is no curved part that gives
There is a problem that the pipe can be bent only with a large radius of curvature.

On the other hand, a tubing material a having a waveform as shown in FIG.
3 is that the entirety of the main body b3 is curved, so that the helical pipe made of this tubing material a3 has good flexibility, and it is easy to construct a pipe provided with a bent part, but the inner surface has large irregularities. Flow resistance is large because it is not smooth. Therefore, when used as a pressure feed pipe, the required pump power becomes large and the operating cost increases, and when used as a drain pipe or a sewer pipe, stagnation or clogging of foreign matter occurs due to poor sweeping performance. There is a problem that it is easy to do.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to easily perform piping with good flexibility and a bent portion. In addition, an object of the present invention is to provide a tube-forming material capable of forming a spiral tube having a smooth inner surface and a small flow resistance of a fluid.

[0008]

In order to achieve the above-mentioned object, the pipe forming material of the helical tube of the present invention is wound spirally, and when spirally wound, adjacent side edges are engaged. It is a long strip-shaped tube-forming material for forming a helical tube together, and engaging portions are formed on both side edges of the cross section, and a bellows-like curved member element is integrally formed between the engaging portions. The portions forming the inner surface of the helical tube of each bending member element are connected to each other by the connected main body, and the portions forming the inner surface of the helical tube of the bending member element are adjacent to each other. It is characterized in that the elements are in contact with each other.

In the present invention, the curved member element is a member element (portion) having substantially the same cross-sectional shape in a continuous main body, and is indicated by 41 in FIG. Examples of the “bellows-shaped curved member element” include an Ω shape, a dovetail shape, and a Z shape.

(Operation) Since the main body of the tube-forming material has a shape in which bellows-like curved member elements are integrally connected, the formed spiral tube has a bending moment at the curved portion of the tube-forming material. , It is relatively easy to bend and it is easy to bend piping.

Further, a portion (hereinafter referred to as an "inner surface forming portion") of each bending member element which forms the inner surface of the spiral tube is formed on substantially the same surface, and the inner surface forming portion is formed by adjoining adjacent bending member elements. As shown in FIG. 5, the inner surface of the pipe is substantially smooth, with little irregularities, such as a helical pipe made of a pipe material shown in FIG. Therefore, the fluid and foreign substances contained therein are easy to flow, and stagnation and clogging are less likely to occur.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the tube material of the present invention.

The tube material 1 is a long strip made by extrusion of hard vinyl chloride, and has a cross-sectional shape as shown in FIG. That is, in FIG. 1, an engagement piece 2 is formed on the right side edge, and an engagement groove 3 for engaging with the engagement piece 2 is formed on the left side edge, and between the engagement piece 2 and the engagement groove 3. The main body 4 has a substantially Ω-shaped (bellows-like) curved member element 41 formed continuously and integrally. As shown in FIG. 4, the engaging portion of the tube material has an engaging groove formed on both side edges, and has a structure in which a fitting member is fitted into and engaged with an adjacent engaging groove. It may be something.

In each bending member element 41, an inner surface forming portion 42 of a spiral tube formed is formed on substantially the same plane. As a result, the inner surface of the spiral tube is smooth without large undulations and irregularities. Further, the inner surface forming portions 42 between the spirals of the adjacent curved member elements 41 are in contact with each other at a portion 43.

When a spiral tube is formed, a joining roller (not shown) of the tube forming machine is wound while being wound by a tube forming machine (not shown) so that the inner surface forming portion 42 becomes the inner surface of the spiral tube as shown in FIG. No), the engaging piece 2 is engaged with the engaging groove 3 to form a tube.

When a bending moment is applied to the spiral tube manufactured in this manner, the outer surface forming portion 44 and the inner surface forming portion are located near the vertex portion 441 of the outer surface forming portion (hereinafter referred to as "outer surface forming portion") 44. The vicinity of the connection portion 42, that is, the vicinity of the connection portion 421 between the curved portion of Ω and the linear bottom portion is easily bent, and the pipe can be bent with a small radius of curvature.

(Embodiment) A spiral pipe is formed by using a pipe material 1 as shown in FIG. 1, and an inner surface of an existing sewer 100 as shown in FIG. 2 laid between manholes MH1 and MH2. And rehabilitated. The existing sewer 100 had an inner diameter d = 900 mm, an extension L = 30 m, and had a curvature radius r = 6 m, a bend angle θ = 10 °, and a bend with a bend angle of approximately 30 ° at almost the center.

The construction is performed in a manhole MH1 in a pipe making machine 200.
Is installed, the pipe-making material 1 is continuously supplied from the ground, and the sewage pipe 1 is formed while the spiral pipe SP is formed as described above.
00 was moved toward the manhole MH2, and the spiral pipe SP thus produced was left inside the existing sewer 100 to line the inner surface. Therefore, the formed spiral tube S
As P passed through the bend, the helical tube SP had to be bent.

According to this method, a spiral pipe SP having an outer diameter of 800 is formed in the existing sewer 100, lined and rehabilitated. As a result, in the existing sewer having a bending angle θ = 30 °, the spiral pipe SP is formed. The construction was almost without difficulty, except that the tip was slightly guided so as not to get caught on the inner surface of the existing sewer when passing through the bend.

In addition, the flow rate and the flow rate are measured by actually flowing water using the straight pipe portion of the spiral pipe SP formed in the existing sewer 100 as described above, and the roughness of the wall surface in Manning's formula is measured. The coefficient was calculated and found to be 0.010, which was equivalent to that of a normal hard vinyl chloride tube.

(Comparative Example) A conventional pipe material a3 as shown in FIG. 5 was used to rehabilitate an existing pipe lining as shown in FIG. 2 by a similar method. As a result, in the case of an existing sewer with a bend angle of 10 °, bending pipes could be managed somehow, but in the case of an existing sewer with a bend angle of 30 °, the resistance when the tip of the spiral pipe passed through the bend was large. It could not bend and could not be bent. Further, when the roughness coefficient of the wall surface of Manning's formula was obtained by the same method as in the example, it was 0.016, which was a considerably large result as compared with the case where the pipe material 1 shown in FIG. 1 was used.

[0022]

As is apparent from the above description, since the spiral pipe using the pipe material of the present invention has good flexibility, the spiral pipe is formed in an existing sewer having a bent portion. It is easy to lining and rehabilitate the sewer, or to construct a new sewer with a bend. Also, the piping cost is low.

In addition, since the inner surface of the formed spiral tube is smooth and the flow resistance is small, the flow rate of the fluid to be transported becomes large when the spiral tube has the same inner diameter. In the case of a pressure pipe, the required pump power is small. Further, in the case of a drain pipe or a sewer pipe, the scavenging property is good, and even if the pipe gradient is small, stagnation or clogging of foreign matter does not easily occur, maintenance of the sewer is easy, and the maintenance cost is low.

Furthermore, even when an earthquake or uneven settlement of the ground occurs, the spiral pipe made of the pipe material of the present invention can be easily bent, and the stress generated in the sewer can be dispersed.
Damage to the pipe wall and breakage and detachment of the joint with the manhole are prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of the tube material of the present invention.

FIG. 2 is an explanatory view (plan view) showing a rehabilitation state of an existing sewer using the pipe material of the present invention.

FIG. 3 is a cross-sectional view showing a conventional pipe-making material.

FIG. 4 is a cross-sectional view showing a conventional pipe-making material.

FIG. 5 is a cross-sectional view showing a conventional pipe-making material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tube material 2 Engagement piece 3 Engagement groove 4 Main part 41 Curved member element 42 Inner surface forming part 44 Outer surface forming part SP Spiral tube

Claims (1)

[Claims] 1. A long strip-shaped tube material for spirally winding and engaging adjacent side edges when spirally wound to form a spiral tube, comprising: Engaging portions are formed on both side edges of the surface, and between the engaging portions, a bellows-like curved member element is connected by a body portion integrally connected to form an inner surface of a spiral tube of each curved member element. The curved portion is formed on substantially the same plane, and the portion forming the inner surface of the spiral tube of the curved member element is such that adjacent curved member elements are in contact with each other.