JP2000205463A - Manufacture of seal rubber for sewage and pipe with spiral guideway - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of seal rubber for sewage suitable for eliminating leakage of sewage on a joint in case of forming a pipe with a spiral guideway of a short pipe with a spiral guideway and the pipe with the spiral guideway easy to manufacture and eliminating a step difference of joints in the spiral guideway. SOLUTION: This seal rubber 1 for drainage is used between a lower end of a spiral guideway 2 of a short pipe 3 with the upper side spiral guideway 2 and an upper end of the spiral guideway 2 of the short pipe 3 with the lower side spiral guideway 2 in case of forming a pipe with the spiral guideway 2 of the short pipe 3 with the spiral guideway 2 integrally forming a part of the spiral guideway 2 on an inner surface of the short pipe, and it is furnished with a surface making contact with a lower end part lower surface and a lower end surface of the upper side spiral guideway and an upper end part upper surface and an upper end surface of the lower side spiral guideway and inclination reaching an upper surface of the lower side spiral guideway from an upper end part of the upper side spiral guideway.

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 pipe with a spiral guideway from a short pipe with a spiral guideway, and in that case, a sewage pipe used at the lower end of the spiral guideway of the short pipe with a spiral guideway. It relates to seal rubber.

[0002]

2. Description of the Related Art The following techniques exist for pipes with a spiral guideway, which are used mainly as vertical pipes for sewage and have a spiral guideway on the inner surface of the pipe. There is a method of assembling a tube with an internal spiral guide path in which a flange or a receiving port insertion port is provided on a short pipe with a spiral guide path to make connection. A pipe with a spiral guideway using this technique can be formed relatively easily as compared with a case where the spiral guideway is integrally formed by hand lay-up of fiber reinforced plastic.

However, the spiral guide path has a disadvantage in that even if short pipes with spiral guide paths are connected so that the spirals are almost continuous, the spiral guide paths are discontinuous at the joints of the spiral guide paths for each short pipe.
As shown in FIG. 20, the flowing fluid (sewage) leaks from the gap b between the spiral guide paths a and a (a dotted arrow in FIG. 20), and there is a problem that a complete spiral flow is not formed. As a method of solving this, as shown in FIG. 21, a method of reducing the step at the joint portion of the spiral guide paths c, c, and as shown in FIG. 22, a joint of the spiral guide paths d, d Although a method of enlarging the overlapping portion is conceivable, none of them has been a means of solving the leakage of sewage from a fundamental joint.

Therefore, in order to eliminate leakage of sewage from the seam, rubber (including foamed rubber) filled with a filler is sandwiched between seams (see FIG. 24).
However, in the case of long-term use, the filler e flows out. In addition, during the production, the injection of the filler e varies depending on the operator. In the case of the method in which the rubber f is sandwiched between seams, there is a concern during long-term use that the rubber f is displaced due to deterioration of the adhesive or the like even if the rubber f is fixed with an adhesive or the like.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is intended for forming a pipe with a spiral guideway from a short pipe with a spiral guideway. An object of the present invention is to provide a seal rubber for sewage suitable for eliminating leakage of sewage at a seam, and a method for manufacturing a pipe with a spiral guideway which is easy to manufacture and has no step at the seam of the spiral guideway. It is.

[0006]

According to a first aspect of the present invention, a short pipe with a spiral guide path is formed by integrally forming a part of a spiral guide path on the inner surface of a short pipe. A seal rubber for sewage used between a lower end of a spiral guideway of a short pipe with an upper spiral guideway and an upper end of a spiral guideway of a short pipe with a lower spiral guideway when forming the pipe, A sewage having a lower end lower surface, a lower end surface of the guide path, a surface abutting on an upper end upper surface and an upper end surface of the lower spiral guide path, and a slope extending from an upper end of the upper spiral guide path to an upper surface of the lower spiral guide path. Seal rubber.

According to a second aspect of the present invention (the second aspect of the present invention), a short pipe having a spiral guide path integrally formed with a part of the spiral guide path on the inner surface of the short pipe is assembled so that the spiral guide path is substantially continuous. A method for manufacturing a pipe with a spiral guide path, wherein the seal rubber for sewage according to claim 1 is adhered to a lower end of the spiral guide path of the molded short pipe with a spiral guide path, and the sewage seal rubber is adhered thereto. This is a method for manufacturing a pipe with a spiral guide path in which the pipe is assembled vertically.

[0008]

The seal rubber for sewage according to the first aspect of the present invention can be used for forming a pipe with a spiral guideway from a short pipe with a spiral guideway in which a part of the spiral guideway is integrally formed on the inner surface of the short pipe. A seal rubber for sewage used between the lower end of the spiral guide path of the short pipe with the lower spiral guide path and the upper end of the spiral guide path of the short pipe with the lower spiral guide path, wherein the lower end surface of the lower end of the upper spiral guide path, the lower end face, and the lower end With the upper end of the side spiral guideway and the surface contacting the upper end surface and the slope from the upper end of the upper spiral guideway to the upper surface of the lower spiral guideway, the seal rubber fits into the seam of the spiral guideway. Since they do not come off together, no fluid leaks from the seam of the spiral guideway.

In the method of manufacturing a pipe with a spiral guide according to the second aspect of the present invention, a short pipe with a spiral guide in which a part of the spiral guide is integrally formed on the inner surface of the short pipe is assembled so that the spiral guide is substantially continuous. A method for manufacturing a pipe with a spiral guide path, wherein the seal rubber for sewage according to claim 1 is adhered to a lower end of the spiral guide path of the molded short pipe with a spiral guide path, and the sewage seal rubber is adhered thereto. By assembling the pipes vertically, when manufacturing the pipe with the spiral guide path by connecting the short pipes with the spiral guide path, the sealing rubber is positioned in the rotation direction of the short pipes, and the manufacture is facilitated. Due to the triangular portion of the seal rubber, the seam of the spiral guideway is eliminated.
Since the seal rubber is fitted at the seam of the spiral guideway,
The seal rubber does not come off.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are cross-sectional views showing examples of the seal rubber for sewage of the present invention. The seal rubber for sewage of the present invention, when forming a pipe with a spiral guideway from a short pipe with a spiral guideway, the lower end of the spiral guideway of the short pipe with the upper spiral guideway and the spiral of the short pipe with the lower spiral guideway. Used between the upper end of the guideway. The seal rubber for sewage of the present invention is as shown in FIG. 1, and in this case, the lower surface of the lower end of the upper spiral guideway, the lower end surface, and the upper surface of the lower spiral guideway and the surface contacting the upper end surface. There is a slope from the upper end of the upper spiral guideway to the upper surface of the lower spiral guideway. The lower end of the spiral guide path of the short pipe with the upper spiral guide path is in contact with the vertical surface of the substantially right-angled upper surface of the seal rubber for sewage in FIG. 1, and the upper end of the guide path of the short pipe with the lower spiral guide path is The lower part of the seal rubber for sewage is in contact with the vertical surface of the substantially right angle, and the seal rubber for sewage is fitted. In addition, those having shapes as shown in FIGS. 2 to 4 are preferably used.

[0011] A portion which is in contact with the lower end surface of the upper spiral guideway and the upper surface of the upper end portion of the lower spiral guideway, and a portion having an inclination from the upper end of the upper spiral guideway to the upper surface of the lower spiral guideway ( The triangle part) and other parts are as shown in FIGS.
Adjacent to the largest corner of the triangle. Further, as shown in FIG. 4, a shape in which a triangular portion and another portion are connected by a straight portion may be used (for the effect, see the first embodiment).

As described above, the triangular portion may be a so-called triangle, or each piece may have some R. In addition, R and chamfer (value of R × 2, chamfer value is approximately 1/2 of the step generated at the joint of the spiral guideway) are provided at the tip of the corner of the triangular portion and other portions. Things are also acceptable.

The use of such a seal rubber has the following advantages. Since the seal rubber is fitted to the joint of the spiral guide path, the seal rubber does not come off. Since the seal rubber is located at the joint of the spiral guide path, no fluid leaks from the joint of the spiral guide path. When manufacturing a pipe with a spiral guide path by connecting the short pipes with a spiral guide path, the seal rubber positions the short pipes in the rotational direction, and the manufacture becomes easy. Since the seal rubber has a slope extending from the upper end of the upper spiral path to the upper surface of the lower spiral path, the seam of the spiral guide path is eliminated.

As shown in FIGS. 5 to 7, the sealing rubber 1 having such a shape is placed in a joint portion of the spiral guide path 2.
As shown in FIG. 8 (plan view), the seal rubber 1 is placed at the joint of the spiral guideway 2. The payment method is as follows. As shown in FIG. 9, a seal rubber 1 is attached to the lower end of the spiral guide path 2 of the short pipe with the spiral guide path. When the seal rubber 1 is attached to the lower end rather than the upper end, there is less possibility that a gap between the spiral guide path 2 and the seal rubber 1 is formed in a portion where the fluid flows. Adhesive 4
For the type of adhesive, an adhesive which can be suitably used by selecting a combination of a seal rubber and a short pipe with a spiral guide path, such as an epoxy type or a urethane type, is selected. Next, when the short pipes with spiral guide paths are overlapped and joined in two stages, the short pipes are rotated in the direction of rotation of the spiral so as to be positioned so that the spiral guide paths are substantially continuous. At this time, the step of the seal rubber acts as a stopper in the rotation direction.

As the material of the seal rubber, natural rubber such as styrene-butadiene copolymer, polychloroprene, polyisoprene, butadiene acrylonitrile copolymer and ethylene-propylene copolymer, and synthetic rubber in general can be used. Further, the seal rubber may be coated and covered with an epoxy resin, a urethane resin, a vinyl ester resin, or the like.
By performing the coating, the chemical resistance and abrasion resistance (wear life) of the seal rubber can be improved. The molding method of the seal rubber can be any of compression, injection, injection, and extrusion depending on the shape. Further, as shown in FIG. 10, a surface that comes into contact with the upper spiral guide path, the lower end surface, and the upper end upper surface of the lower spiral guide path, the inclined portion, and other portions are separately formed, and FIG. As shown in (1), there is also a method of bonding later (see Example 1).

[0016]

The present invention will be described below with reference to examples. Example 1 First, one spiral pitch made of a hard non-foamed polyurethane (some bubbles are included) as a raw material was molded together with its short tube by reaction injection molding in which a polyol and an isocyanate were collision-mixed and molded. Dimensions etc. Short tube: Polyurethane inner diameter φ250mm, tube thickness of short tube 7.5mm Outer diameter φ250mm of spiral guideway, inner diameter φ90mm (with a core tube for ventilation purpose of outer diameter φ90mm) Thickness of spiral: 6.0mm Length : 160 mm 2.

The shape and manufacturing method of the seal rubber were implemented as follows. It has a fan shape in a plan view with a shape as shown in FIG. In this embodiment, the gradient of the slope from the upper end of the upper spiral guideway of the seal rubber 1 to the upper surface of the lower spiral guideway is larger than the gradient of the spiral guideway 2 so that the close contact with the lower spiral is better. (See FIGS. 14 and 15).
The seal rubber shown in FIG. 16 has a shape (having the same cross section) suitable for extrusion molding. Costs can be reduced during mass production. The seal rubber shown in FIG. 11 is the same as that of FIG. 9 when combined, except that the surface provided with the upper helical guideway, the lower end surface, the upper surface of the lower helical guideway, the upper surface of the lower spiral guideway, the inclined portion, and other portions are provided. Divide and mold and glue them together. For example, there is an advantage that even when the gap between the spiral guide paths is different at other diameters, it can be dealt with by changing the bonding position. The seal rubber shown in FIG. 4 has a cross-sectional shape in which a surface having contact with the upper spiral guide path, the lower end surface, the upper end upper surface of the lower spiral guide path, the inclined portion, and other portions are linearly connected. It can be molded by molding methods such as extrusion and injection. This shape occurs when the ends of the upper and lower spirals overlap.
Since the bonding area between the seal rubber and the spiral guide path is increased, the reliability at the time of assembly is improved.

From these short tubes, short tubes with spiral guide paths for three pitches were assembled as follows. The seal rubber was formed into a shape as shown in FIG. 12 using a styrene-butadiene copolymer and subjected to a surface halogen treatment. As shown in FIG. 9, the formed seal rubber was attached to the spiral guide inner passage with an adhesive. In the assembly of the pipe with the spiral guide path, the short pipe with the spiral guide path is connected up and down. At this time, as shown in FIG. 13, the rotation direction of the spiral guide path 2 (FIG.
Arrow). By using the seal rubber 1, the seal rubber 1 serves as a stopper in the rotation direction, and the alignment in the rotation direction is facilitated when the spiral guide path 2 is assembled so as to be continuous. In the assembled short pipe 3 with the spiral guide path, no leakage of fluid into the gap between the joints of the spiral guide path 2 was observed.

The material of the seal rubber is styrene-
In addition to the butadiene copolymer, synthetic rubbers such as butadiene acrylonitrile copolymer, polyisoprene, and ethylene-propylene copolymer, and natural rubbers in general can be used.

The material of the short pipe with a spiral guideway is, in addition to the polyurethane of the present embodiment, a reaction injection material mainly composed of a norbornene-based monomer and a metathesis catalyst, and a thermoplastic resin such as polyvinyl chloride. Or if
In the case of a thermosetting resin or the like, a case of a fiber reinforced plastic is also possible. Further, it is possible without any problem in the case of a foamed material such as foamed polyurethane.

Example 2 The operation was carried out as shown in FIG. In this embodiment, the triangular portion formed as shown in FIG. 11 and other portions are attached to the upper and lower ends of the spiral guide path of the short pipe with the spiral guide path. Even in such a method, the performance as in the first embodiment can be obtained. The advantage in this case is that, for example, even when the gap between the spiral guide paths is different in another diameter, it can be dealt with by changing the bonding position (see FIG. 11, Example 1). However, there is a disadvantage that when the adhesive is deteriorated, the rubber may come off the spiral guide path.

Embodiment 3 In Embodiment 3, the sealing rubber of the present invention is applied to a method other than the production of a tube with a spiral guideway. The seal rubber used had a configuration in which a triangular portion similar to FIG. 4 and another portion were connected by a straight line. As shown in FIGS. 18 and 19, when the lid 6 is covered with resin, fiber-reinforced plastic, a metal plate, or grating in a hole such as a rectangular human hole 5, the sewage seal rubber 1 of the present invention is used. The lid 6 is set. With the above lid, the odor in the human hole does not leak to the outside, the slope of the lid covers the slope of the lid, and even when the trolley etc. passes over the lid, it does not catch on the step, Does not shift from the hole position. Further, there is an effect that the seal rubber does not come off.

[0023]

According to the present invention, as described above, when a short tube with a spiral guideway is assembled to manufacture a tube with a spiral guideway, the seal rubber is fitted and disengaged at the joint of the spiral guideway. No fluid leaks from the seam of the spiral guideway. When manufacturing a pipe with a spiral guide path by connecting the short pipes with a spiral guide path, the seal rubber positions the short pipes in the rotational direction, and the manufacture becomes easy. The lower surface of the lower end of the upper spiral guideway of the seal rubber, the lower end surface, the upper surface of the lower spiral guideway, the surface that contacts the upper end surface, and the slope from the upper end of the upper spiral guideway to the upper surface of the lower spiral guideway. Is provided, the step generated at the joint of the turning guide path is eliminated. Since the seal rubber is fitted to the joint of the spiral guide path, the seal rubber does not come off. Further, when used as a seal rubber for a lid of a human hole or the like, an odor in the human hole does not leak to the outside. The step of the lid is covered by the slope of the sealing rubber, so that even when the bogie or the like passes over the lid, the step does not catch on the step. The lid does not shift from the position of the human hole. Also, the sealing rubber does not come off.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a seal rubber for sewage of the present invention.

FIG. 2 is a sectional view showing another example of the seal rubber for sewage of the present invention.

FIG. 3 is a sectional view showing still another example of the seal rubber for sewage of the present invention.

FIG. 4 is a sectional view showing still another example of the seal rubber for sewage of the present invention.

FIG. 5 is a cross-sectional view showing the storage of the seal rubber for sewage of the present invention.

FIG. 6 is a cross-sectional view showing the storage of the seal rubber for sewage of the present invention.

FIG. 7 is a cross-sectional view showing the storage of the seal rubber for sewage of the present invention.

FIG. 8 is a plan view showing the storage of the seal rubber for sewage of the present invention.

FIG. 9 is a cross-sectional view showing a state in which the seal rubber for sewage of the present invention is attached to a spiral guideway with an adhesive.

FIG. 10 is a cross-sectional view showing a method for producing a seal rubber for sewage of the present invention.

FIG. 11 is a cross-sectional view illustrating a method for producing a seal rubber for sewage according to the present invention.

12A is a left side view showing the seal rubber for sewage of the present invention, FIG. 12B is a front view thereof, and FIG. 12C is a right side view thereof.

FIG. 13 is a perspective view showing a method for assembling a tube with a spiral guideway according to the present invention.

FIG. 14 is a sectional view showing a state of a gradient of the seal rubber for sewage of the present invention.

FIG. 15 is a sectional view showing a state of a gradient of the seal rubber for sewage of the present invention.

FIG. 16 (a) is a front view showing a shape suitable for extrusion molding of the seal rubber for sewage of the present invention, and FIG. 16 (b) is a side view thereof.

17A is a cross-sectional view showing a state of an upper part of the seal rubber for sewage of the present invention, and FIG. 17B is a cross-sectional view showing an example of a state of a lower part thereof.

FIG. 18 is a plan view showing a state in which the seal rubber for sewage of the present invention is used in a human hole.

19 is an enlarged view of an AA cross section in FIG. 18;

FIG. 20 is a side view showing a state of a seam portion of a spiral guideway according to the related art.

FIG. 21 is a side view showing a state in which a step at a joint portion of a spiral guide path according to the related art is reduced.

FIG. 22 is a side view showing a state in which an overlapping portion of a seam portion of a conventional spiral guide path is enlarged.

FIG. 23 is a side view showing a state in which a filler is filled in a seam portion of a conventional spiral guide path.

FIG. 24 is a side view showing a state in which rubber is sandwiched between seams of a spiral guide path according to the related art.

[Explanation of symbols]

 1, 1a, 1b, 1c Seal rubber 2 Spiral guideway 3 Short pipe

Claims (2)

[Claims] 1. When forming a pipe with a spiral guide path from a short pipe with a spiral guide path in which a part of the spiral guide path is integrally formed on the inner surface of the short pipe, the spiral guide path of the short pipe with the upper spiral guide path. Seal rubber for sewage used between the lower end of the lower spiral guideway and the upper end of the spiral guideway of the short pipe with the lower spiral guideway, the lower and lower ends of the lower end of the upper spiral guideway and the upper end of the lower spiral guideway. A seal rubber for sewage, comprising: a surface contacting an upper surface and an upper end surface; and an inclination extending from an upper end of the upper spiral guideway to an upper surface of the lower spiral guideway. 2. A method for manufacturing a tube with a spiral guide path, comprising assembling a short pipe with a spiral guide path in which a part of the spiral guide path is integrally formed on the inner surface of the short pipe so that the spiral guide path is substantially continuous, The spiral according to claim 1, wherein the sewage seal rubber according to claim 1 is adhered to a lower end of the helical guide path of the short pipe with the helical guide path, and the short pipe with the helical guide path to which the sewage seal rubber is adhered is vertically assembled. Manufacturing method of pipe with guideway.