JPH09207217A - Method for reclaiming existing tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reclaiming an existing tube without reducing the cross-sectional area of a channel largely. SOLUTION: In this reclamation method, a spiral tube which is formed by winding a synthetic resin belt 2 spirally is inserted into the inner surface of an existing tube 1 having a noncircular cross section to line with the spiral pipe. The method is composed of a process in which the belt 2 in which a coupling recessed stripe is formed in one side end part and a coupling projected stripe is formed in the other side end part is wound spirally, the coupling recessed stripe of one adjacent belt 2 and the coupling projected stripe of the other belt 2 are coupled to form a spiral tube 26, a process in which the spiral tube 26 is molded in a shape conforming to a noncircular existing tube, and a process in which the noncircular spiral tube 27 is inserted into the existing tube 1 and the existing tube 1 is lined with the spiral tube 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rehabilitating an existing pipe having a non-circular cross section (for example, a polygon such as a triangle or a quadrangle, or one half of which is circular and the other half of which is quadrangular). Is.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 2-245317.
As described in Japanese Patent Publication, a synthetic resin strip having an engaging groove at one end and an engaging protrusion at the other end is spirally supplied and wound, A spiral tube is formed by engaging the engaging groove of one of the adjacent synthetic resin strips with the engaging projection of the other synthetic resin strip, and the spiral tube is formed into a metal tube or a fume tube. There is known a method of rehabilitating an existing pipe, which is inserted into the existing pipe and lined with the spiral pipe.

[0003]

However, in such a conventional method of rehabilitating an existing pipe, there is no special problem if the existing pipe has a normal circular cross section, but the cross sectional shape of the existing pipe is not In the case of a circular shape, for example, a polygonal shape such as a triangle or a quadrangle, if a spiral tube having a circular cross section is inserted into a non-circular existing pipe, the non-circular existing pipe has a corner inner surface and a spiral pipe outer surface. A large gap is generated between them, and the flow passage cross-sectional area in the existing pipe is greatly reduced by that amount, and there is a problem that a predetermined flow rate cannot be secured.

The present invention has been made by paying attention to such a problem in the conventional method for rehabilitating an existing pipe,
It is an object of the present invention to solve the above problems and provide a method for rehabilitating an existing pipe without significantly reducing the flow passage cross-sectional area.

[0005]

In order to achieve the above object, a method of rehabilitating an existing pipe according to the present invention comprises a step of forming a spiral pipe into a shape suitable for an existing pipe having a non-circular cross section, and a spiral having a non-circular cross section. It is characterized in that it comprises a step of inserting a pipe into an existing pipe and lining the existing pipe with a spiral pipe.

In the present invention, the material of the spiral tube is
Although the ones conventionally used for spiral tubes can be used as they are without any particular limitation, for example, hard vinyl chloride resin, polyethylene, polypropylene, polyphenylene sulfide (PPS), nylon, ABS resin, etc. Synthetic resin can be used.

In the present invention, as the spiral tube, a synthetic resin strip having an engaging groove at one end and an engaging projection at the other end is spirally supplied and wound. A spiral tube formed by engaging the engaging groove of one of the adjacent synthetic resin strips and the engaging projection of the other synthetic resin strip may be used. As a means for forming such a spiral tube, a means that has been conventionally used, for example, Japanese Patent Publication No. 3-48392 or Japanese Patent Publication No. 3-1049.
As described in Japanese Patent No. 3 or the like, a synthetic resin strip-shaped plate is guided to a predetermined position by a guide roll, and the synthetic resin strip-shaped plate is introduced between the inside and outside between the sandwiching rolls to sandwich the synthetic resin strip-shaped plate. The spiral tube may be formed by engaging the engaging groove of one of the adjacent synthetic resin strips with the engaging projection of the other synthetic resin strip.

[0008]

In the method for rehabilitating an existing pipe according to the present invention, a step of forming the spiral pipe into a shape suitable for the existing pipe having a non-circular cross section,
Inserting a spiral pipe with a non-circular cross-section into the existing pipe, and lining the existing pipe with the spiral pipe.Therefore, a large gap may occur between the inner surface of the non-circular existing pipe and the outer surface of the spiral pipe. There is no fear that the flow passage cross-sectional area in the existing pipe will be significantly reduced.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing an embodiment of a method for updating an existing pipe of the present invention.

In FIG. 1, reference numeral 1 is an existing sewer pipe (box culvert) having a non-circular cross section to be rehabilitated. 2
Is a polyethylene strip-shaped plate, and the strip-shaped plate 2 is, as shown in FIG. 2, provided with an engaging recess 21 having a bifurcated shape at one side edge thereof and with retaining portions 22, 22 facing each other inside the opening end. An engaging projection 23 that is engaged in the engaging recess 21 is provided on the other side edge. Reference numeral 24 is a T-shaped rib provided on one side of the strip plate 2 at substantially equal intervals, and 25 is a steel reinforcing member having a W-shaped cross section, which is locked between the two T-shaped ribs 24, 24. Two
It has a role of maintaining the shape of the spiral tube formed by.

The strip-shaped plate 2 is wound and housed in a drum 3. The strip-shaped plate 2 is unwound from the drum 3 so as not to be twisted, passes through the existing pipe 1 and reaches the spiral pipe forming device 4. The spiral tube forming device 4 is provided with a pinching roll 42 around the main shaft 41, and the strip-shaped plate 2 is engaged with the engaging groove 21 of one strip-shaped plate 2 and the other strip-shaped plate 2 adjacent to each other by the stripping-roll 42. The spiral tube 25 having a circular cross section is formed by engaging with the engaging projection 23 of.

The spiral tube 25 having a circular cross section formed in this way is gripped from the side by the clamper 43, and the carriage 45 on which the clamper 43 is placed by the operation of the hydraulic cylinder 44 moves on the rail 46. It is moved to the horn forming device 5 by moving a predetermined distance.

As shown in FIG. 3, the horn forming device 5 includes:
The pressing die 5 is driven from the central axis 51 by the actuator 52.
3 is provided so as to reciprocate in the radial direction,
The spiral tube 25 having a circular cross section reaches the horn forming device 5, the inner surface of the spiral tube 25 is pressed by the pressing die 53, and the cross sectional shape is formed into a substantially square shape.

Next, as shown in FIG. 4, with the side portion of the spiral tube 25 having a circular cross section being held by the clamper 43, the carriage 45 is further moved in the direction of the arrow by the operation of the hydraulic cylinder 44 so that the cross section has a quadrangular cross section. The spiral tube 26 is inserted into the existing tube 1. By repeating such an operation, the existing pipe 1 is lined intermittently and continuously with the spiral pipe 26 having a square cross section, and the existing pipe 1 is renewed. The inner surface of the existing pipe 1 and the inserted square spiral pipe 26
If there is a gap between them, mortar is injected as a backfill material.

The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration of the present invention is not limited to the illustrated embodiments, and design changes within the scope not departing from the gist of the present invention. Are included in the present invention. For example, in the illustrated embodiment, the square spiral pipe 26 is formed outside the existing pipe and inserted inside the existing pipe, but the square spiral pipe 26 is formed inside the existing pipe. Good.

[0016]

In the method of rehabilitating an existing pipe according to the present invention, a step of forming the spiral pipe into a shape suitable for the existing pipe having a non-circular cross section, and inserting the spiral pipe having a non-circular cross section into the existing pipe, Since it consists of the process of lining the existing pipe, a large gap does not occur between the inner surface of the existing pipe with a non-circular cross section and the outer surface of the spiral pipe, and the flow passage cross-sectional area in the existing pipe is greatly reduced. There is no fear.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a method for rehabilitating an existing pipe of the present invention.

FIG. 2 is a cross-sectional view showing an example of a belt-shaped body used in the method for rehabilitating an existing pipe of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is an explanatory diagram showing a next step of the embodiment of the method for rehabilitating an existing pipe of the present invention shown in FIG. 1.

[Explanation of symbols]

 1 Sewage pipe 2 Belt-shaped plate 21 Engagement concave line 23 Engagement convex line 24 T-shaped rib 25 Reinforcing material 3 Drum 4 Spiral pipe forming device 41 Main shaft 42 Clamping roll 43 Clamper 44 Hydraulic cylinder 45 Bogie 46 Rail 5 Corner forming device

Claims (1)

[Claims] 1. A step of forming a spiral pipe into a shape that fits an existing pipe having a non-circular cross section, and a step of inserting a spiral pipe having a non-circular cross section into the existing pipe and lining the existing pipe with the spiral pipe. A method for rehabilitating an existing pipe characterized by.