JP3676475B2 - Rehabilitation of existing pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for rehabilitating an existing pipe having a non-circular cross section such as a square cross section.
[0002]
[Prior art]
Conventionally, as described in, for example, Japanese Patent Laid-Open No. 2-245317, a synthetic resin belt-shaped plate in which an engagement groove is provided at one end and an engagement protrusion is provided at the other end. Are spirally fed, and a helical tube is formed by engaging the engaging recesses of one of the adjacent synthetic resin strips with the engaging protrusion of the other synthetic resin strip. There is known a method of rehabilitating an existing pipe by inserting the pipe into an existing pipe such as a metal pipe or a fume pipe and lining the existing pipe with a spiral pipe.
[0003]
[Problems to be solved by the invention]
However, in such a conventional method of rehabilitating existing pipes, there is no particular problem if the existing pipe has a normal circular cross section, but when the existing pipe has a non-circular shape such as a square cross section. When a spiral tube having a circular cross section is inserted into an existing tube having a non-circular cross section, a large gap is formed between the inner surface of the existing tube having a non-circular cross section and the outer surface of the spiral tube having a circular cross section. There is a problem that the area is greatly reduced and a predetermined flow rate cannot be secured.
[0004]
The present invention has been made by paying attention to such problems in the conventional method of rehabilitating existing pipes, and the object of the present invention is to solve the above problems and to greatly reduce the cross-sectional area of the flow path. The object is to provide a method for rehabilitating existing pipes that is not required.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the existing pipe rehabilitation method of the present invention is a method for rehabilitating an existing pipe in which the inner surface of an existing pipe having a non-circular cross-sectional shape is lined with a spiral pipe, and the synthetic resin belt-like plate is cross- Inserted into a circular existing tube, wound a synthetic resin strip in a spiral shape, joined the ends of the synthetic resin strip to form a circular tube with a circular cross section, The inner surface is pushed into a spiral tube with a square cross section by a push die provided so that it can reciprocate in the radial direction, and it is formed into a non-circular cross section that matches an existing pipe with a non-circular cross section. It is characterized by lining existing pipes.
[0006]
In the present invention, the material of the strip plate made of synthetic resin is not particularly limited as long as it can be used as it is for forming a helical tube. For example, a hard vinyl chloride resin is used. , Synthetic resins such as polyethylene, polypropylene, polyphenylene sulfide (PPS), nylon, and ABS resin can be used.
[0007]
In the present invention, as a method of forming a spiral tube by winding a synthetic resin strip in a spiral shape and joining the ends of the synthetic resin strip together, a conventionally employed apparatus can be used as it is. Although not particularly limited, for example, a synthetic resin belt-like plate having an engaging recess at one end and an engaging protrusion at the other end is spiral. The spiral tube may be formed by supplying and winding and engaging the engaging recesses of one of the adjacent synthetic resin strips and the engaging protrusion of the other synthetic resin strip.
[0008]
In order to form such a spiral tube, as described in Japanese Patent Publication No. 3-48392 and Japanese Patent Publication No. 3-10493, a synthetic resin strip is guided to a predetermined position by a guide roll, Engagement ridges of one synthetic resin belt-shaped plate adjacent to each other by the pressure roller introduced between the pressure-rolling rollers that sandwich the synthetic resin belt-shaped plate from the inside and outside, and the engagement ridges of the other synthetic resin belt-shaped plate And the helical tube may be formed by engaging the.
[0009]
[Action]
In the rehabilitation method for an existing pipe of the present invention, a synthetic resin strip is inserted into an existing pipe having a non-circular cross section, the synthetic resin strip is wound spirally, and the ends of the synthetic resin strip are joined together. By forming a spiral tube with a circular cross section, the inner surface of the spiral tube having a circular cross section is formed by a pressing die provided so as to be able to reciprocate in the radial direction. Since the existing pipe is lined with a non-circular spiral tube that conforms to the pipe, a large gap is formed between the inner surface of the non-circular existing pipe and the outer surface of the non-circular spiral pipe. Does not occur, and there is no fear that the channel cross-sectional area in the existing pipe will be significantly reduced.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing an embodiment of a method for rehabilitating an existing pipe of the present invention.
In FIG. 1, 1 is an existing sewer pipe (box culvert) to be rehabilitated, and the cross-sectional shape of the existing sewer pipe 1 is substantially rectangular.
[0011]
2 is a polyethylene belt-like plate. As shown in FIG. 2, the belt-like plate 2 has a bifurcated shape on one side edge thereof, and an engagement groove 21 having a retaining portion 22, 22 facing the opening end. A thick engagement ridge 23 is provided on the other side edge to be engaged in the engagement recess 21. Reference numeral 24 denotes T-shaped ribs provided on one side of the belt-like plate 2 at substantially equal intervals, and 25 denotes a steel reinforcing member having a W-shaped cross section that is locked between the two T-shaped ribs 24, 24. 2 has the role of maintaining the shape of the helical tube formed by the two.
[0012]
Reference numeral 3 denotes a drum, in which the belt-like plate 2 is wound and accommodated in the drum 3, and the belt-like plate 2 is fed out so as not to be twisted from the drum 3.
[0013]
Reference numeral 4 denotes a helical tube forming apparatus. As shown in FIGS. 3 and 4, the helical tube forming apparatus 4 includes an attachment frame 41 provided at the center and four extensions extending radially from the attachment frame 41. It comprises a joining mechanism part 42 provided in one of the parts and a guide mechanism part 43 provided in another extension part of the mounting frame 41.
[0014]
The mounting frame 41 is configured by welding a tubular body 411 in a cross shape. An armband 412 is slidably inserted into the tube opening of the tube body 411 and is fixed by a fixing bolt 413.
The joining mechanism portion 42 is provided with an external roll 421 and an internal roll 422, and a gear mechanism that drives and rotates the external roll 421 and the internal roll 422 is provided in the box body 423, and the gear mechanism is driven by a handle 424. . Reference numeral 425 denotes a spacer roll for maintaining a gap.
[0015]
The guide mechanism portion 43 is provided with a short tubular attachment member 431, the attachment member 431 is provided with a frame body 432, and the frame body 432 is provided with a guide roll 433 so that it can roll. Reference numeral 434 denotes a fixing bolt provided on the attachment member 431.
In the belt-like plate 2, the engagement concave strip 21 of one strip-like plate 2 and the engagement protrusion 23 of the other strip-like plate 2 are engaged by the outer roll 421 and the inner roll 422 of the joining mechanism portion 42. Thus, the spiral tube 26 having a circular cross section is formed.
[0016]
At this time, the engagement guide action of the outer roll 421 of the joining mechanism portion 42 and the concave groove between the T-shaped ribs 24, 24 of the strip plate 2 and the engagement of the inner roll 422 and the engagement recess 21 of the strip plate 2. Due to the combined guide action, the outer roll 421 and the inner roll 422 revolve in the circumferential direction of the spiral tube 26 as indicated by an arrow a, and move in the axial direction of the spiral tube 26 as indicated by an arrow b. At the same time, the helical tube forming device 4 is moved forward by the engagement guide action of the guide roll 433 of the guide mechanism portion 43 and the engagement recess 21 of the belt-like plate 2.
[0017]
5 is a cart within the spiral tube 26 that is propelled and moved in the depth direction of the existing tube 1. The cart 5 is provided with a core shaft support portion 51, and the core shaft support portion 51 has a core shaft of the angle forming device 6. 61 is supported.
As shown in FIG. 5, the angle forming device 6 is provided so that the pressing die 63 can reciprocate in the radial direction from the core shaft 61 by an actuator 62, and the spiral tube 26 having a circular cross section is provided in the angle forming device 6. Finally, the inner surface is pushed by the pressing die 63 so that the cross-sectional shape is formed into a substantially square shape, and the helical tube 27 is formed into a square cross section.
[0018]
Next, a mode for carrying out the rehabilitation method of the present invention using the above apparatus will be described.
A belt-like plate 2 is supplied into the existing sewer pipe 1 from within the drum 3, and an engagement groove 21 of one belt-like plate 2 adjacent to the other and a belt-like engagement plate 23 of the other belt-like plate 2 by a spiral tube forming device 4. To form a spiral tube 26 having a circular cross section, and then forming the spiral tube 26 having a circular cross section into a spiral tube 27 having a square cross section by the angle forming device 6, and the existing sewer pipe 1 using the spiral tube 27 having a square cross section. And renew the existing sewer pipe 1.
When a gap is generated between the inner surface of the existing sewer pipe 1 and the inserted rectangular spiral pipe 27, mortar is injected as a backfill material.
[0019]
The embodiment of the present invention has been described above with reference to the drawings. However, the specific configuration of the present invention is not limited to the illustrated embodiment, and design changes within a scope not departing from the gist of the present invention can be made. include.
For example, in the illustrated embodiment, the outer roll 421 and the inner roll 422 are driven and rotated by the handle 424, but may be driven and rotated by power.
[0020]
【The invention's effect】
In the rehabilitation method for an existing pipe of the present invention, a synthetic resin strip is inserted into an existing pipe having a non-circular cross section, the synthetic resin strip is wound spirally, and the ends of the synthetic resin strip are joined together. By forming a spiral tube with a circular cross section, the inner surface is pushed into a spiral tube with a square cross section by a pressing die provided so that the circular tube with a circular cross section can be reciprocated in the radial direction. Since the existing pipe is lined with a non-circular spiral tube that conforms to the pipe, a large gap is formed between the inner surface of the non-circular existing pipe and the outer surface of the non-circular spiral pipe. Does not occur, and there is no fear that the channel cross-sectional area in the existing pipe will be significantly reduced.
[Brief description of the 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 band used in the method for rehabilitating an existing pipe of the present invention.
FIG. 3 is a front view showing a helical tube forming apparatus used in the method for rehabilitating the existing pipe of the present invention shown in FIG. 1;
4 is a cross-sectional view taken along line IV-IV in FIG. 3;
FIG. 5 is a front view showing the angulation apparatus used in the method for rehabilitating the existing pipe of the present invention shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Existing sewer pipe 2 Strip | belt-shaped board 21 Engagement groove 23 Engagement protrusion 24 T-shaped rib 25 Reinforcement material 26 Spiral tube with circular cross section 27 Spiral tube with square cross section 3 Drum 4 Spiral tube forming device 5 Carriage 6 Square forming device

Claims (1)

  A method of rehabilitating an existing pipe in which the inner surface of an existing pipe having a non-circular cross section is lined with a spiral pipe, and the synthetic resin strip is inserted into the existing pipe having a non-circular cross section, and the synthetic resin strip is spirally formed. A spiral tube having a circular cross section is formed by winding and joining ends of the synthetic resin belt-like plates, and the inner surface is pushed by a pressing die provided so that the circular tube having a circular cross section can be reciprocated in the radial direction. A method for rehabilitating an existing pipe, which is formed into a spiral pipe having a rectangular cross section, formed into a non-circular cross section suitable for an existing pipe having a non-circular cross section, and the existing pipe is lined with a spiral pipe having a non-circular cross section.

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