JP4786227B2 - Lining method for existing pipelines - Google Patents

Description

  The present invention relates to a lining method for an existing pipeline that forms a lining material on the inner surface of an existing pipeline that is laid between manholes.

  Conventionally, various methods have been developed as lining methods applied for the purpose of repairing or protecting pipes laid between underground manholes or between ground facilities. Typical methods that are in practical use include a resin lining method that forms a resin lining film on the inner surface of the pipe and a lining method that introduces a liner sealing material to the inner surface of the pipe and attaches it. it can.

  Among them, the lining method is to fix the end of the tube-shaped sealing material that is inverted to one end of the pipe, and then apply this sealing material to the inner surface of the pipe from one end to the other. The reversing lining method, which is advanced while being widely used, is widely used as a method with high workability.

  A construction example of this reverse lining method will be described with reference to FIG. As shown in the figure, first, a suction pump J5 having a valve J4 is airtightly connected to one end opening J31 of a pipe line J3 in which pipe joints J1 and J2 are interposed. Next, the sponge-like leading pig 6 having an outer diameter slightly larger than the inner diameter of the pipe line J3 is inserted into the pipe line J3 from the other end opening J32 of the pipe line J3. Further, the resin cassette J7 is attached to the other end opening J32 and the suction pump J5 is operated, whereby the pressure in the pipe line J3 becomes negative, and the required amount of resin J8 as an adhesive is introduced into the pipe line J3. The Next, the suction pump J5 is temporarily stopped, the resin cassette J7 is removed, and the tube delivery / storage device J9 is attached to the other end opening J32. The tube delivery / storage device J9 is equipped with a lining tube material J10 wound around a reel or the like, and the end portion of the lining tube material J10 is prepared in a folded state. Then, by operating the suction pump J5 again, the leading pig J6 and the resin J8 are advanced from the other end opening J32 of the conduit J3 toward the one end opening J31, while the inner tube material J10 is reversed and the tube is formed by the resin J8. It adheres to the inner wall of the path J3 (for example, refer to Patent Document 1 below). Here, an example is shown in which the inside of the pipe line J3 is made negative pressure by the operation of the suction pump J5, and the lining tube material J10 is advanced, but fluid pressure is applied from the other end opening J32 side to push out the lining tube material J10. The resin J8 and the leading pig J6 can be advanced by this pressure.

Japanese Patent Laid-Open No. 9-241602

  Applications of existing pipelines include conduits for flowing gas, water and sewage, and installed pipelines when cables such as power lines and telephone lines are laid underground. In these existing pipe lines, if the pipe inner diameter is greatly reduced after the above-described lining treatment, the flow area of the fluid is reduced, and the storage area of the laying object such as a cable is reduced. Therefore, it is not preferable. In particular, in repairing or protecting the inner surface of a cable laying pipe line, it is required to secure the inner diameter of the pipe by making the lining layer extremely thin. For example, the thickness of the lining tube material to be applied is about 0.1 mm. It is required to cope with a resin adhesive layer of 2 mm or less.

  Further, as shown in FIG. 1, when various pipe joints exist in the middle of the pipe, a gap portion communicating with the inside of the pipe is formed in the joint portion. Therefore, when resin lining is used, this gap is made of resin. Although it is necessary to fill the gap, the resin cannot be filled in the gap portion in the pipe joint simply by arranging and moving the resin behind the leading pig as in the conventional lining reversal method described above.

  Therefore, in the conventional lining reversal method, external pressure such as water pressure from the outside of the pipe easily acts directly on the lining tube material in the pipe at the joint part, especially when the lining tube material is thinned to meet the above-mentioned requirements. Since the self-supporting property of the lining tube material itself is low, there may be a problem that the lining tube material is crushed in the tube by the external pressure described above.

  The present invention has been proposed to cope with such a situation. In a lining method using a lining material, a lining layer can be thinned to ensure a sufficient pipe inner area, and a pipe having a pipe joint. Even when a thin lining material having low self-supporting property with respect to the road is applied, it is an object of the present invention that the gap in the joint portion can be sufficiently filled with resin to maintain a good construction state.

As a means for achieving such an object, the present invention provides a replacement pig for replacing air and resin by replacement from one end opening of an existing pipeline to a gap in a joint portion of the existing pipeline, a curable resin liquid, and the existing pipeline. A film thickness regulating pig that regulates the film thickness of the resin film formed on the inner surface of the road is sequentially introduced into the existing pipe line, and the inner tube material is reversed to the outside from the rear stage of the film thickness regulating pig. The replacement pig is inserted into the outer peripheral surface that is in close contact with the inner surface of the existing pipe line, and the curable resin liquid at the rear stage of the replacement pig enters into the joint part of the existing pipe line to fill the resin. An air replacement groove for allowing air to escape from the gap in the joint portion to the front of the replacement pig, and applying pressure to the lining tube material to provide an inverted folded portion of the lining tube material. By proceeding in the pipeline The replacement pig, the curable resin liquid, and the film thickness regulating pig are moved toward the other end opening of the existing pipe line, and the gap between the joint portions is filled with the curable resin liquid, and the existing lining tube material is used. It is characterized by lining a pipeline.

  According to such a feature, even when there is a joint part in the existing pipe line, it is possible to prevent the external pressure from directly acting on the lining tube material by replacing and filling the resin in the gap of the joint part, and the self-supporting property is low. Even when a thin lining material is applied, it is possible to maintain a good state of reverse lining construction. Therefore, the lining layer made of the lining tube material and the curable resin liquid can be made as thin as possible to ensure a sufficient tube area.

The lining method of the existing pipe line which concerns on embodiment of this invention is demonstrated based on drawing. Drawing 2 is an explanatory view explaining the construction situation of the embodiment of the present invention (the figure (b) is an XX sectional view in the figure (a)). The existing conduit 1, substituted pig 2, the curable resin liquid 3, the thickness regulating pig 4, insert the lining tubing 5 sequentially from one end side, the pressure P ₁ which is added to the lining tubing 5, the lining While the inverted folding portion of the tube material 5 is advanced in the existing pipe line 1, the other end of the existing pipe line 1 is opened by the pressing force of the replacement pipe 2, the curable resin liquid 3, and the film thickness regulating pig 4 by the lining tube material 5. Move towards.

  Here, the replacement pig 2 is provided with a resin filling groove 2a through which the subsequent curable resin liquid 3 enters and feeds the resin into the joint portion 1J, and an air replacement groove provided to allow air to escape from the gap in the joint portion 1J. 2b, and is used to fill and replace the curable resin liquid 3 in the gap of the joint portion 1J.

There are various types of replacement pigs 2, but in the illustrated case, both the resin filling groove 2 a and the air replacement groove 2 b are provided on the outer peripheral surface of the replacement pig 2 that is in close contact with the inner surface of the existing pipe line 1. The rear end of the groove 2a opens rearward, and the front end of the air replacement groove 2b opens forward. This structure derives the resin pressure P ₂ by the movement resistance of the substituted pig 2 with existing pipeline within 1, the substitution pig 2 approaches the joint portion 1 J, curing resin liquid with a resin pressure P ₂ for receiving from the rear 3 enters the gap of the joint portion 1J through the resin-filled groove 2a, whereby the air in the gap is replaced and discharged to the front of the replacement pig 2 through the air replacement groove 2b, and into the gap in the joint portion 1J. The curable resin liquid 3 is surely filled.

  The curable resin liquid 3 disposed at the rear stage of the replacement pig 2 is an extremely thin layer formed between the amount necessary for filling the gap in the joint portion 1J and the lining tube material 5 and the inner surface of the existing pipe line 1 ( 0.2 mm or less) An amount necessary for forming the lining film is introduced into the existing pipe line 1.

  The film thickness regulating pig 4 disposed at the subsequent stage of the curable resin liquid 3 may be any one having an outer diameter that is substantially the same as or slightly smaller than the inner diameter of the existing pipe line 1. However, other forms such as a spherical shape may be used. Thereby, it is possible to prevent a large amount of resin from entering between the lining tube material 5 and the inner surface of the existing pipe line 1 and to form an extremely thin lining film.

  The lining tube material 5 disposed at the rear stage of the film thickness regulating pig 4 is the same as that of the prior art, but here, in order to prevent a decrease in the inner diameter of the existing pipe line 1 after repair or protection, the film thickness is 1 mm. The following thin lining tube material 5 is employed. Such a thin lining tube material 5 generally has low self-supporting properties, but by reliably filling and replacing the curable resin liquid 3 in the joint portion 1J, no external pressure is directly applied to the lining tube material 5, A uniform resin layer is formed while being thin by the film thickness regulating pig 4, so that the lining tube material 5 can be securely adhered to the inner surface of the existing pipe line 1.

  FIG. 3 is an explanatory view showing an on-site construction example of the embodiment of the present invention. Here, the existing pipeline 1 that communicates between the manholes M1 and M2 is targeted. The connecting pipe 10 is attached to the end 1A of the existing pipe line 1 having one end opened in the manhole M1, and the replacement pig 2 is first introduced from the opening end of the connecting pipe 10. Thereafter, the resin cassette 11 is connected to the open end to introduce a necessary amount of the curable resin liquid 3, the resin cassette 11 is removed, and the film thickness regulating pig 4 is introduced. Further thereafter, the delivery end 12A of the tube delivery / storage device 12 is connected to the aforementioned open end.

The tube delivery / storage device 12 stores a lining tube material 5 wound around a reel (not shown), and one end of the lining tube material 5 is fixed in a state of being inverted to the connecting portion 12B. Then, by introducing a fluid pressure from the pressure pump 13 into the pressure introduction chamber 12C in the connection part 12B, by adding the pressure P ₁ in the lining tubing 5, existing pipe lining tubing 5 from the end portion 1A Introduce into the road 1. Then, by continuing to apply pressure as described above, the replacement pig 2, the curable resin liquid 3, the film thickness regulating pig from the end 1A on one end side to the end 1B on the other end side of the existing pipe line 1 are provided. 4. The lining tube material 5 is moved.

  According to the lining method of the existing pipe line according to such an embodiment, even when the joint part 1J is present in the existing pipe line 1, the resin in the gap of the joint part 1J is replaced and filled, and the outer tube member 5 is subjected to external pressure. Can be prevented from acting directly, and even when a thin lining material having low self-supporting property is applied, a good reverse lining construction state can be maintained. Therefore, the lining layer made of the lining tube material 5 and the curable resin liquid 3 can be made as thin as possible to ensure a sufficient pipe area with respect to the existing pipe line 1.

It is explanatory drawing of a prior art. It is explanatory drawing explaining the construction condition of embodiment of this invention (the figure (b) is XX sectional drawing in the figure (a)). It is explanatory drawing which showed the construction example of the field of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing pipe line 1J Joint part 1A, 1B End 2 Replacement pig 2a Resin filling groove 2b Air replacement groove 3 Curable resin liquid 4 Film thickness control pig 5 Lined tube material 10 Connecting pipe 11 Resin cassette 12 Tube sending / storage device 12A Delivery end 12B Connection 12C Pressure introduction chamber 13 Pressure pump

Claims (1)

From one end opening of the existing pipeline,
A replacement pig that replaces and fills the gap in the joint portion of the existing pipe with air and resin, a curable resin liquid, and a film thickness regulating pig that controls the film thickness of the resin film formed on the inner surface of the existing pipe. Will be introduced in sequence,
From the rear stage of the film thickness regulation pig, insert the lining tube material in a state where the inside is inverted to the outside,
The substituted pig is
A resin-filled groove for feeding the resin into the joint portion of the existing pipe line by the curable resin liquid following the replacement pig entering the outer peripheral surface in close contact with the inner surface of the existing pipe line, It has an air replacement groove that allows air to escape from the gap to the front of the replacement pig,
By applying pressure in the lining tube material and causing the inverted folded portion of the lining tube material to advance in the existing pipe line, the replacement pig, the curable resin liquid, and the film thickness regulating pig are supplied to the existing pipe line. The existing pipe line is lined with the lining tube material while being moved toward the other end opening of the pipe and filling the void of the joint portion with the curable resin liquid.

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