JP5909207B2 - Underground pipe rehabilitation pipe material - Google Patents

Description

  The present invention relates to a rehabilitation pipe material used when rehabilitating an existing pipe buried in the ground, and more specifically, an existing pipe such as a sewage pipe is displaced to cause a step, a damage such as a crack, or the like. The present invention relates to a pipe for rehabilitation newly laid on the inside to rehabilitate the existing pipe when the pipe is corroded or deteriorated due to long-term use.

  Existing pipes buried directly in the ground, such as tap water, sewage, agricultural water, industrial water, and gas, are connected as they pass through a long time regardless of whether they are made of metal or plastic. Various obstacles such as steps, deformation of the tube body, cracks, etc. occur in the part. When these obstacles occur, the flow force of the fluid in the pipe decreases, groundwater enters and flows out of the pipe, and it becomes difficult to secure a required flow rate. To avoid these problems, regular maintenance is required.

  When a failure such as that described above occurs in an existing pipe, as one of typical rehabilitation methods particularly when the existing pipe has a medium to small diameter of 200 to 900 mm, the existing pipe to be rehabilitated is, for example, a thermosetting resin. After inserting a tubular fiber structure material (bag-shaped lining material) made of nonwoven fabric or knitted fabric impregnated with air and introducing air pressure into the bag-shaped lining material when the resin is in an uncured state, There is a lining method for curing a resin by steam heating or light irradiation. However, this method is often done at the site where the resin is cured, and it is long and flexible. In addition to the difficulty in handling the bag-like lining material itself, it is affected by the work environment at the site. Is inevitable and it is difficult to obtain a uniform lining pipe.

  On the other hand, one of the other typical rehabilitation methods is a construction method that is also suitable when the existing pipe has a medium and small diameter as described above, and when rehabilitating the existing pipe, the pipe smaller than the diameter of the existing pipe After suspending the welfare pipe with a socket of diameter from the opening of the manhole into the pipe line and inserting the socket part into the existing pipe with the front facing forward, the tip of the subsequent rehabilitation pipe material is the rear end socket part of the existing pipe There is a method of inserting and pushing out and repeating this so that the top rehabilitation tube material reaches the adjacent manhole. However, the rehabilitation pipe with socket has a large-diameter socket at one end of a pipe body having a uniform cross section, so that the subsequent rehabilitation pipe with socket is inserted into the existing pipe in sequence. When the tip is connected to the socket portion of the rehabilitating pipe with socket, a large gap and a small gap are alternately formed between the inner surface of the existing pipe and the outer peripheral surface of the rehabilitation pipe with socket. This gap must be filled with backfill material such as cement mortar.

  If the rehabilitation pipe has a socket as described above, the gap between the existing pipe and the rehabilitation pipe is uniformly filled with backfilling material compared to normal pipes with no uneven surface. It becomes even more difficult to do. If this filling is not performed uniformly, as described in, for example, Japanese Patent Application Laid-Open No. 2011-110856 (Patent Document 1), a space will be formed between the existing pipe and the rehabilitation pipe material, and the passage through the space. As a result, part of the groundwater and drainage flows and flows out from the cracked part of the existing pipe to the road surface. Furthermore, as described in JP-A-9-222182 (Patent Document 2), the rehabilitation pipe material has a socket, so that the space loss of the existing pipe increases and the existing pipe is curved. In such a case, the fitting at the socket part is released and the pushing operation becomes impossible, and the water tightness at the socket part cannot be secured.

Therefore, in Patent Document 2, a large number of unit pipes having an opening diameter smaller than that of the existing pipe are connected in the length direction in the existing pipe buried in the ground, and a new pipe is laid in the existing pipe. In the rehabilitation method for existing pipes, a taper pipe is used as the unit pipe, and the taper pipe is inserted from one of the two adjacent manholes into the other manhole side, with the small diameter portion first, and the large diameter portion is followed by The small diameter portion of the taper tube is inserted by winding a packing made of water-expandable rubber on the small diameter portion, and this is repeated to reach the leading taper tube to the other manhole.

  In the invention described in this Patent Document 2, the material of the unit tube can be made of stainless steel, vinyl chloride or the like, and its length and outer diameter can be appropriately set according to the degree of curvature and inner diameter of the existing tube. However, in either stainless steel or plastic, it is sufficient that the difference between the outer diameter of the large diameter portion and the inner diameter of the existing pipe is 10 mm, and the length of the connection portion is preferably about 40 to 60 mm. When the inner diameter of the existing pipe is 250 mm, the length of the taper pipe is preferably 500 to 700 mm, the outer diameter of the large diameter portion is 230 to 240 mm, and the taper is preferably 1/70 to 1/50.

  The taper tube is inserted into an existing tube while being sequentially pushed in one direction between two adjacent manholes. When the subsequent taper tube is pushed in, a packing made of water-expandable rubber is wound around the tip of the taper tube to seal the joint of the taper tube. Because it uses a tapered tube in this way, not only is it easier to manufacture than a conventional tube with a socket, but the connection between the tapered tubes is due to the fitting of one small diameter part and the other large diameter part, The large diameter portion of the tapered tube can be set to be equal to or greater than the socket diameter of the conventional tube with socket, and the effective diameter of the new tube can be increased accordingly, and the space loss of the existing tube is reduced. In addition, since the taper tubes are connected by fitting, if the fitting is shallow, the movement between the taper tubes is given a degree of freedom, and even when the existing tube is curved, it is possible to insert the taper tube without any trouble. Become.

  The invention described in the above-mentioned Patent Document 2 certainly brings about the above-mentioned beneficial effect. However, the joint portion between the tapered tubes necessarily lies between the outer peripheral surface of the small diameter portion and the end surface of the large diameter portion. A step corresponding to the thickness of the tapered tube is formed. In order to eliminate a step from the outer peripheral surface of a pipe material having the same outer diameter, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2007-16926 (Patent Document 3), the ends of the pipe material are connected to each other. It is desired to connect and fix them together.

  However, in the invention described in Patent Document 3, the inner tube is made of a stainless steel tube and the outer tube is made to face the end face of a double tube (double-layer synthetic tube) made of a synthetic resin tube such as vinyl chloride. The joint part is fitted and connected to an annular packing having a certain width from both sides, and the joint outer periphery of the synthetic pipe connected by the packing is further connected by a metal or plastic pipe joint socket made of two circular arc bodies. In connection with the pipe for pipe rehabilitation, two or more pipes for pipe rehabilitation are sequentially connected and laid in a pipe line from one manhole to an adjacent manhole.

JP 2011-110856 A JP-A-9-222182 JP 2007-16926 A JP-A-11-230408

However, the pipe for pipe rehabilitation disclosed in Patent Document 3 has an extremely complicated structure as described above, has a large number of parts, is not limited to economical aspects, and is complicated in its assembly. High nature. In addition, the pipe joint socket has flanges extending in the inner diameter direction at both ends, and the pipe joint socket is provided so as to cover the surface of the connecting portion in which the pipe rehabilitation connecting pipes having the same folding angle and opening diameter are connected to each other. When installed, the flange expands from the outer peripheral surface of the main body of the pipe for pipe rehabilitation by the amount of the flange, and a large gap is provided between the inner surface of the existing pipe and the outer peripheral face of the pipe for pipe rehabilitation as with the rehabilitation pipe with socket. And small gaps are alternately formed, and it becomes difficult to evenly fill the gaps with the backfilling material in the backfilling operation after the laying is completed.

  The present invention has been made to solve the various problems of the conventional underground buried pipe rehabilitation pipes at once. Specifically, the number of parts is small, the structure is simple, and the production is easy. The pipe connection work can be performed smoothly without any complications regardless of the surrounding circumstances, and the backfilling material can be filled evenly during backfilling work, and the underground buried pipe has high strength and excellent chemical resistance. The purpose is to provide rehabilitation tubing.

In order to achieve such an object, the basic configuration of the present invention is to introduce a plurality of short pipe materials into an existing pipe buried underground, and sequentially connect those pipe materials in the length direction so that the inner pipe A pipe member for rehabilitating a prefabricated pipe that lays and integrates the pipe for rehabilitation on the outer peripheral surface of one first end of the connection end, and the first taper part is formed with a tapered first taper surface. configured, Ri inner peripheral surface of the second end portion which is another connection ends the name has a second tapered surface which fits closely the first tapered portion,
A ring-shaped concave groove for accommodating and fixing a packing material is formed on the outer peripheral surface of the first tapered surface on the second end side, and a step is provided on the second end-side end surface of the ring-shaped concave groove. A ring-shaped square notch having the same outer diameter as the outer peripheral surface of the central portion of the tube material, and the entire region of the second tapered surface facing the ring-shaped concave groove and the ring-shaped square notch has a stepped portion. A thin cylindrical portion extending toward the end surface of the ring-shaped square notch portion and having a uniform thickness smaller than the height of the ring-shaped square notch portion,
There is no uneven surface on the outer peripheral surface and inner peripheral surface in the connection part of a series of renovated pipes at the end of connection, and the thickness is made equal to the thickness of the central pipe part of the regenerated pipe material,
It is characterized by that.

According to a preferred embodiment, the thickness of the thin cylindrical portion is preferably set equal to the notch height of the ring-shaped square notch. The rehabilitation pipe material is preferably made of stainless steel or a synthetic resin material, and is preferably a synthetic resin material because of its chemical resistance and low roughness coefficient of the processed surface. Among them, hard polyvinyl chloride or polyethylene is preferable. It is.

  By providing the rehabilitation tube material of the present invention with the above-described basic configuration, the required regions of the outer peripheral surface of the first end and the inner peripheral surface of the second end are respectively cut in the same direction by cutting. A rehabilitating tube material having a desired shape can be obtained by a simple operation by simply forming a tapered surface having substantially the same length and the same taper angle. Further, even in the preferred embodiment, the ring-shaped concave groove portion, the ring-shaped square notch portion, and the thin cylindrical portion can be easily obtained by an operation of only cutting.

  Further, the rehabilitation tube material of the present invention having the above-described configuration allows the subsequent rehabilitation having the same taper angle and length toward the second taper surface formed on the inner surface of the second end portion of the preceding rehabilitation tube material. By simply inserting the first end portion of the pipe material, the two tapered surfaces are automatically tightly connected. Even if the axial centers of the first and second end portions are slightly displaced at the time of insertion, if the tip of the first end portion is inserted and pushed into the opening of the second end portion, the tapered surfaces of each other become guide surfaces. Therefore, since the center is naturally coincident, high-precision alignment is not necessary.

Furthermore, when the close fitting operation of the first end portion with respect to the second end portion is completed, the pipe diameter at the connection portion between the preceding rehabilitation tube material and the subsequent rehabilitation tube material is the same, so that the connection portion has an uneven surface. Does not occur, for example, even when there is a step in the radial direction in the connection part of the existing pipe, because there is no part protruding from the pipe surface like the conventional rehabilitation pipe with socket, The rehabilitation tube material can be inserted very smoothly. At the same time, the backfilling work in the subsequent backfilling process can be performed smoothly and easily, and the backfilling material is uniformly filled in the gap formed between the inner surface of the existing pipe and the outer peripheral surface of the rehabilitation pipe material. be able to. Moreover, if a ring-shaped packing made of, for example, water-expandable rubber is attached and fixed to the ring-shaped concave groove portion, the sealing function at the connecting portion between the preceding rehabilitation tube material and the subsequent rehabilitation tube material is sufficiently exhibited. .

It is a longitudinal cross-sectional view which abbreviate | omits and shows a typical structure of the tubular material for rehabilitation of this invention. It is a longitudinal cross-sectional view which shows the connection structural example of the same rehabilitation pipe material. It is a longitudinal cross-sectional view which shows the example of a specific structure at the time of the connection of the said rehabilitation pipe material. It is a longitudinal cross-sectional view which shows the example of a condition when inserting the subsequent rehabilitation pipe material into an existing pipe. It is a longitudinal cross-sectional view which expands and shows an example of the insertion machine applied at the time of insertion with respect to the tube material for rehabilitation which precedes the tube material for subsequent rehabilitation. It is a longitudinal cross-sectional view which shows the laying state in the existing pipe after the rehabilitation by a plurality of rehabilitation pipe materials. It is explanatory drawing which shows an example of the renovation process of the existing pipe.

Hereinafter, typical embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a typical embodiment in which a central portion of an existing pipe rehabilitation pipe according to the present invention is omitted. In FIG.1 and FIG.2, the code | symbol 1 has shown the pipe material for rehabilitation. The rehabilitating tube 1 includes one end (first end) 11 having a required length, the other end (second end) 12 having a required length, and first and second ends 11. , 12 and a central pipe portion 13 which is a pipe body. The outer peripheral surface of the first end portion 11 is formed into a tapered first taper surface 11a having a required taper angle, and the inner peripheral surface of the second end portion 12 is directed to the first end portion 11 side, so that A second taper surface 12a having substantially the same taper angle and length as the taper surface 11a is formed. As shown in FIG. 2, the second taper surface 12a of the preceding rehabilitation pipe member 1 has a subsequent rehabilitation. The first tapered surface 11a of the pipe material 1 is fixed in a state of being closely fitted.

  According to the illustrated example, a ring-shaped groove 11b is formed on the outer peripheral surface of the large-diameter end of the first tapered surface 11a. The groove width of the ring-shaped concave groove portion 11b is formed to be slightly larger than the width dimension of the ring-shaped packing 14 to be described later, and the subsequent rehabilitating tube material 1 on the second tapered surface 12a of the preceding rehabilitating tube material 1. When the first end portion 11 is fitted, as shown in FIG. 3, the ring-shaped packing 14 is attached and fixed in advance to the ring-shaped concave groove portion 11b by adhesion or the like. When the first end portion 11 is fitted to the second tapered surface 12a via the ring-shaped packing 14, the connecting portion between the first tapered surface 11a and the second tapered surface 12a connects the ring-shaped packing 14 to the second tapered surface 12a. Thus, the sealing property is sufficiently secured, and the first and second end portions 11 and 12 of the preceding rehabilitation tube material 1 and the subsequent rehabilitation tube material 1 are connected and fixed in a consolidated state. Incidentally, in this embodiment, water-expandable rubber is used as the ring-shaped packing 14. This water-expandable rubber, for example, as introduced in the above-mentioned Patent Document 2, is made by mixing a water-absorbing resin with rubber or chemically reacting with rubber to give hydrophilicity. When contacted, it expands and the gap between the first and second taper surfaces 11a and 12a is elastically strongly closed to ensure complete sealing.

On the other hand, the second end 12 which is the other end of the rehabilitating tube 1 is formed on the second tapered surface 12a whose inner peripheral surface closely fits with the first tapered surface 11a as described above. A part of the end region on the opening end side of the two tapered surfaces 12a is formed in the thin cylindrical portion 12b having the same inner diameter and the outer diameter equal to the outer diameter of the central tube portion 13 through a step. The opening-side end surface of the thin cylindrical portion 12b extends so as to face the ring-shaped square notch portion 11c formed at the end of the first tapered surface 11a. The formation region of the thin cylindrical portion 12b is a region facing the ring-shaped concave groove portion 11b and the ring-shaped ring-shaped square notch portion 11c in the first tapered surface 11a. Incidentally, the groove width of the ring-shaped concave groove portion 11b is 26 mm, and the ring-shaped rectangular cutout portion 1 is used.
1c has a notch width of 2.5 mm, the thin cylindrical portion 12b has a length of 30 mm, and the thin cylindrical portion 12b has a thickness of 3 mm.

  Hereinafter, a typical example of a manufacturing procedure of the hard vinyl chloride rehabilitation pipe material 1 having the above-described configuration will be specifically described with reference to FIGS. 1 and 2. Note that this specific manufacturing procedure is merely an example, and for example, the numerical values shown in this procedure can be variously changed according to the material and dimensions of the rehabilitation pipe material.

  According to the illustrated example, first, a rigid polyvinyl chloride pipe (JIS K6741 standard) having an outer diameter of 216 mm and a wall thickness of 11 mm was cut into a length of 600 mm to obtain a single pipe material. Using an NC lathe machine with one end of this tube as the first end 11 and 100 mm long from the tip, so that the outer peripheral surface has a thickness of 3.5 mm at the tip and a thickness of 6.6 mm at the rear end. The first taper surface 11a was formed by taper cutting. A ring-shaped concave groove portion 11b having a groove width of 26 mm and a depth of 3 mm was formed by cutting at the rear end portion of the first tapered surface 11a. A ring-shaped rectangular notch 11c having a width of 2 mm rearward from a position 3 mm deep at the rear end of the ring-shaped concave groove 11b is cut through a step.

  On the other hand, the second end portion 12 which is the other end portion (rear end portion) of the cut tube material is cut into a cylindrical surface having a wall thickness of 3 mm from the rear end of the second end portion 30 over a length of 30 mm. Thus, the thin cylindrical portion 12b was formed. Next, at the rear end position of the thin cylindrical portion 12b, a 70 mm long first pipe starts from a position where 3 mm of the thin cylindrical portion 12b and 1.25 mm on the inner diameter side are left out of the tube body having a thickness of 11 mm. Two tapered surfaces 12a were formed. At this time, the thickness of the end surface on the small diameter side of the second tapered surface 12a is 7.25 mm, and the taper of the second tapered surface 12a is 1/70. Of course, this taper is not limited to 1/70, and is determined by the required connection length and the thickness of the central tube portion 13.

  The rehabilitating tube material 1 of the present invention thus obtained is used as a tube material for rehabilitating the existing tube 2 embedded in the vicinity of the bottom of the adjacent manholes 20 and 21 with both ends opened from the inside of the tube. As shown in FIG. 7, the rehabilitating tube material 1 is suspended from the upper surface opening of one manhole 20 by a wire or the like and lowered to the manhole bottom, and the tip of the first end portion 11 is directed toward the adjacent manhole 21. They are sequentially inserted and drawn into the existing pipe 2 using the insertion machine 3. Specifically, the small diameter of the first end 11 in the subsequent rehabilitation pipe 1 toward the second tapered surface 12a formed at the second end 12 of the preceding rehabilitation pipe 1 drawn into the existing pipe. The end portions are inserted, and one by one is sequentially drawn into the existing pipe and connected to the other manhole 21 using an insertion machine 3 described later. The rehabilitation pipe 1 according to the present embodiment uses a hard vinyl chloride pipe as described above, but may be another synthetic resin pipe or a stainless steel pipe. The taper surface 11a and the taper of the second taper surface 12a of the second end portion 12 are preferably 1/50 to 1/70.

In the present embodiment, the insertion machine 3 for inserting the rehabilitation pipe material 1 into the existing pipe 2 has the same configuration as that disclosed in Patent Document 4 (Japanese Patent Laid-Open No. 11-230408). Is shown enlarged in FIG. This will be described in detail with reference to FIG. 4 and FIG. 4. The insertion machine 3 includes a cylindrical hollow drum 3a having a diameter smaller than the inner diameter of the rehabilitation tube material 1, and a front end face of the hollow drum 3a. A stem 3b extending forward (in the insertion direction) from the center; a first disc 3c fixed to the tip of the stem 3b; and a center hole through which a tip screw portion (not shown) of the stem 3b is inserted. The distal end threaded portion is inserted into the center hole, and the second disc 3d is fastened and fixed to the first disc 3c by a nut, and is arranged on the outer peripheral surface of the hollow drum 3a. A cylindrical member (elastic clamp) 3e having elastic properties, such as rubber, whose edges are closely fixed to the front and rear ends of the outer peripheral surface of the hollow drum 3a, and the first and second disks 3c, 3d at the center. Doughnut-shaped flange 3f ′ and the same And an umbrella-shaped cover 3f having a large number of strip-shaped elastic pieces 3f ″ that are bent at right angles from the outer peripheral edge of the flange 3f ′ and that extend integrally in parallel along the stem 3b and can be opened and closed in the radial direction.

  When the insertion machine 3 is not set on the rehabilitation tube 1 and is alone, air is not introduced into the elastic clamp 3e and the umbrella cover 3f is closed. Is in a state. When the insertion machine 3 is set on the rehabilitation pipe 1, the hollow drum 3 a and the elastic clamp 3 e are inserted into the rehabilitation pipe 1 in the above-described state, and the umbrella cover 3 f is inserted into the rehabilitation pipe 1. The strip-shaped elastic piece 3f "is made to protrude outwardly from the opening on the one end 11 side, and all of the strip-shaped elastic pieces 3f" are opened against elasticity, and the rehabilitating tube material is formed at the free edge of each of the strip-shaped elastic pieces 3f ". The first taper surface 11a is covered so as to surround the front end portion thereof. At this time, the free end edge of each strip-shaped elastic piece 3f ″ is elastically pressed against the surface of the ring-shaped packing 14 fixed to the first end portion 11 so that the umbrella-shaped cover inside the rehabilitation pipe 1 is provided. The positions of 3f and the hollow drum 3a are determined.

  A small hole 3a 'is formed in a part of the hollow drum 3a, and a free end of an air hose 4 having one end connected to an external air compressor (not shown) extends into the drum of the hollow drum 3a. When the compressed air sent from the air compressor is ejected from the other end of the air hose 4, the compressed air is injected into the hollow drum 3 a through the small hole 3 a ′ of the hollow drum 3 a. For entering the gap between the outer peripheral surface of 3a and the cylindrical member 3e having elasticity, the cylindrical member 3e is expanded in the radial direction and strongly pressed against the inner peripheral surface of the rehabilitating tube 1 for rehabilitation. The tube material 1 is pressed and supported from the inner surface. At this time, the free end portion of the strip-shaped elastic piece 3f ″ of the umbrella-type cover 3f in the insertion machine 3 is elastically deformed and expanded, and is a ring that is fitted and fixed to the first end portion 11 of the rehabilitation tube material 1. A substantially conical lead portion is formed by the umbrella-shaped cover 3f that presses against the cylindrical packing 14 from the outside and protrudes forward from the tip of the first end portion 11 of the rehabilitating tube 1.

  One end of a traction member 3g such as a wire or a rope is fixed to the vicinity of the nut of the second disk 3d disposed at the leading end of the leading portion, and the other end of the traction member 3g is disposed in the vicinity of the adjacent manhole 21. Attach to winch 5.

  Now, using the insertion machine 3 having these configurations, a large number of the rehabilitation pipes 1 are sequentially inserted into the existing pipes 2 and connected and integrated, and then between the existing pipes 2 and the rehabilitation pipes 1. The rehabilitation procedure of the existing pipe for refilling the existing pipe 2 by filling and curing the backfill material in the gap formed in FIG.

  First, the top rehabilitation pipe material 1 is hung from the bottom of one of the adjacent manholes 20 and 21 and lowered. Prior to inserting the rehabilitation pipe 1 into the existing pipe 2, the rehabilitation pipe 1 is mounted with the insertion machine 3 in advance. The rehabilitation pipe member 1 to which the insertion machine 3 is attached inserts the leading portion of the conical umbrella-shaped cover 3f into the existing pipe 2 toward another adjacent manhole. After the rehabilitation pipe 1 is inserted into the existing pipe 2 together with the insertion machine 3, the pulling material 3 g such as a wire fixed to the leading portion is wound up by the winch 5, and the second end 12 of the rehabilitation pipe 1 is When the rear end reaches the rear end opening position of the existing pipe 2, the air hose 4 connected to the small hole 3 a ′ formed in the hollow drum 3 a of the insertion machine 3 is pulled out, and between the hollow drum 3 a and the cylindrical member 3 e. The high-pressure air to be filled is discharged out of the machine, and at the same time, the free end portion of the strip-shaped elastic piece 3f ″ of the umbrella-type cover 3f is removed from the first end portion 11 of the rehabilitation pipe 1, and the umbrella-type cover 3f is closed, The insertion machine 3 is pulled by the pulling material 3g, and the rehabilitation pipe 1 is removed from the front, leaving the rehabilitation pipe 1 in place.

Next, when the second and subsequent rehabilitation pipes 1 are inserted into the preceding rehabilitation pipe 1 and the subsequent rehabilitation pipe 1 is pushed into the preceding rehabilitation pipe 1, The insertion machine 3 is set again, and is pulled toward the adjacent manhole 21 by the same operation as that of the top rehabilitation tube 1 by the pulling material 3g, and this is connected and fixed. According to the illustrated example, every time the rehabilitation pipe 1 is connected, the insertion machine 3 is set to a new rehabilitation pipe 1. In the present invention, for example, one rehabilitation method described in Patent Document 4 is used. The insertion machine 3 may be used for each rehabilitation pipe 1 or, as disclosed in Patent Document 2, the insertion machine 3 is used for the top rehabilitation pipe 1 using the traction material 3g. Are continued to be drawn into the opening of the adjacent manhole 21, and for the second and subsequent rehabilitation pipe members 1, a pressing end plate (not shown) is arranged on the rear end surface of each subsequent rehabilitation pipe member 1, At the same time, the rear end surface of the preceding rehabilitation tube material 1 is pushed toward the adjacent manhole 21 and connected to the preceding rehabilitation tube material 1 using a dedicated traction material.

  Thereafter, when the above-described operation is repeated and the leading insertion machine 3 reaches the other manhole, the insertion machine 3 is removed, and a new pipe connected with the numerous rehabilitation pipes 1 is placed inside the existing pipe 2. Laid. When all the connections of the rehabilitating pipe 1 are finished, as shown in FIG. 6, a backfilling material 23 such as cement mortar is injected and filled in the gap between the existing pipe 2 and the new pipe, and after this is solidified, The leading and trailing ends of the rehabilitating tube material 1 protruding from the open ends of the manholes 20 and 21 into the manhole are removed by cutting. Next, the exits of the adjacent manholes 20 and 21 are finished, and the rehabilitation process is completed.

Hereinafter, typical examples of the present invention will be described more specifically based on the drawings.
FIG. 1 shows a longitudinal sectional view of an existing pipe rehabilitation pipe 1 which is a typical embodiment of the present invention. The pipe diameter of the existing pipe 2 rehabilitated based on the pipe for rehabilitation 1 according to this embodiment is 250 mm, the nominal diameter of the pipe for rehabilitation 1 is 200 mm, the approximate inner diameter is 194 mm, the wall thickness is 11 mm, and the total length of the pipe for rehabilitation 1 Is 600 mm, the fitting lengths of the first end portion 11 and the second end portion 12 are each 50 mm, the effective length as the rehabilitation tube material 1 is 500 mm, and has the following structure.

  According to FIGS. 1 and 2, the outer diameter of the small diameter portion is 201.25 mm, the outer diameter of the large diameter portion is 216 mm, and the length is 600 mm from the front end of the first end portion 11 of the preceding rehabilitation tube material 1 to a position of 99.5 mm. It was manufactured with a dimension of (taper 3/50). Further, a thin cylindrical portion 12b having a thickness of 3 mm from the rear end of the second end portion 12 to 30 mm is provided, and the inner peripheral surface has a taper surface of 3/5 from the thin cylindrical portion 12b to a position 69.5 mm forward. ing. A ring-shaped concave groove portion 11b having a depth of 3 mm for accommodating and fixing the ring-shaped packing 14 having a groove width of 26 mm is formed at a position of 71.5 mm from the small-diameter end of the first end portion 11 to the large-diameter end side. Has been. The ring-shaped packing 14 was a band-shaped packing made of water-expandable rubber and having a thickness of 5.9 mm and a width of 24.5 mm.

  The tubular member 1 for rehabilitation of the present invention having the above-described basic configuration is manufactured by cutting the required regions of the outer peripheral surface of the first end portion 11 and the inner peripheral surface of the second end portion 12 in the same direction by cutting. The rehabilitating tube material 1 having a desired shape can be obtained by a simple process of forming the tapered first and second tapered surfaces 11a and 12a having substantially the same length and having a taper angle. Further, as in the above embodiment, the ring-shaped concave groove portion 11b and the ring-shaped rectangular notch portion 11c formed in the first end portion 11 or the thin cylindrical portion 12b formed in the second end portion 12 are also cut. It can be easily manufactured with just a simple operation.

  In addition, the rehabilitation tube material 1 of the present invention has the above-described configuration, so that the same taper angle and length toward the second taper surface 12a formed on the inner surface of the second end portion 12 of the preceding rehabilitation tube material 1 are obtained. The two tapered surfaces are automatically and closely fitted together by a simple operation of simply inserting the first end portion 11 of the subsequent rehabilitation pipe member 1. Even when the axial centers of the first and second end portions 11 and 12 are slightly displaced at the time of insertion, if the tip of the first end portion 11 is inserted into the opening of the second end portion 12 and pushed in, the taper surfaces of each other Becomes a guide surface, and the center is naturally coincident with each other, so high-precision alignment work is unnecessary.

  Furthermore, when the close fitting operation of the first end portion 11 with respect to the second end portion 12 is completed, the pipe diameters of the connecting portions after the fitting of the preceding rehabilitation tube material 1 and the subsequent rehabilitation tube material 1 are the same. Therefore, a bulging surface due to a socket or the like does not occur in the connection portion, and the gap between the existing pipe 2 and the rehabilitation pipe material 1 can be minimized, and the loss of the effective space of the existing pipe 2 is greatly reduced. Since the connecting portion can be a smooth surface, the backfilling operation in the subsequent backfilling process can be performed smoothly and easily, and the backfilling material 23 is renewed from the inner surface of the existing pipe 2. The gap between the outer peripheral surface of the pipe material 1 can be filled evenly. In addition, if a ring-shaped packing made of, for example, water-expandable rubber is attached and fixed to the ring-shaped concave groove, the volume of the packing increases due to expansion even if water penetrates into the connecting portion, and is elastic. Higher sealing performance is demonstrated by helping.

DESCRIPTION OF SYMBOLS 1 Rehabilitation pipe material 11 1st edge part 11a 1st taper surface 11b Ring-shaped recessed groove part 11c Ring-shaped square notch part 12 2nd edge part 12a 2nd taper surface 12b Thin-walled cylindrical part 13 Central pipe part 14 Ring-shaped packing 2 Existing Tube 3 Inserting machine 3a Hollow drum
3a 'small hole 3b stem 3c first disk 3d second disk 3e cylindrical member (elastic clamp)
3f Umbrella type cover 3f 'Donut-shaped flange 3f "Strip-shaped elastic piece 3g Towing material 20, 21 Manhole 23 Backfill material 4 Air hose 5 Winch

Claims (5)

A pipe for rehabilitating existing pipes that introduces a number of short pipes into the existing pipes buried underground and connects them sequentially in the length direction and lays and integrates the pipes for rehabilitation in the existing pipes. The outer peripheral surface of one first end of the connection end portion constitutes a first taper portion formed in a tapered first taper surface, and the inner end of the second end portion which is the other connection end portion. Ri circumferential surface name a second tapered surface which fits closely the first tapered portion,
A ring-shaped concave groove for accommodating and fixing a packing material is formed on the outer peripheral surface of the first tapered surface on the second end side, and a step is provided on the second end-side end surface of the ring-shaped concave groove. A ring-shaped square notch having the same outer diameter as the outer peripheral surface of the central portion of the tube material, and the entire region of the second tapered surface facing the ring-shaped concave groove and the ring-shaped square notch has a stepped portion. A thin cylindrical portion extending toward the end surface of the ring-shaped square notch portion and having a uniform thickness smaller than the height of the ring-shaped square notch portion,
There is no uneven surface on the outer peripheral surface and inner peripheral surface in the connection part of a series of renovated pipes at the end of connection, and the thickness is made equal to the thickness of the central pipe part of the regenerated pipe material,
Tube material for underground buried pipe rehabilitation characterized by this. The pipe material for underground buried pipe rehabilitation according to claim 1 , wherein a thickness of the thin cylindrical portion is equal to a cutout height of the ring-shaped square cutout portion.   The underground pipe rehabilitation pipe material according to claim 1 or 2, wherein the rehabilitation pipe material is made of a synthetic resin material. The pipe for underground buried pipe rehabilitation according to claim 3, wherein the synthetic resin material is hard polyvinyl chloride or polyethylene.   The pipe material for underground buried pipe rehabilitation according to claim 1 or 2, wherein the pipe for rehabilitation is made of stainless steel.

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