Claims
- 1. A method of lining the internal surface of a pipe, said method comprising the steps of:
- injecting a necessary amount of resin into the pipe from an open end thereof;
- inserting, behind the resin, a lining pig into the pipe;
- providing a positive pressure as a pushing force, including the step of producing the positive pressure by an air blower provided with a first pressure detecting/controlling means:
- applying the positive pressure behind the resin and lining pig in the pipe;
- providing a negative pressure as a suction force, including the step of producing the negative pressure by a suction pump provided with a second pressure detecting/controlling means;
- applying the negative pressure in front of the resin and lining pig in the pipe;
- keeping the positive pressure and the negative pressure within predetermined ranges respectively so as to obtain a substantially stabilized pressure differential across the resin and lining pig and further comprises the steps of detecting the positive pressure in the pipe with the first pressure detecting/controlling means and controlling the air blower so that the positive pressure in the pipe is constantly maintained within a predetermined range, and detecting the negative pressure in the pipe with the second pressure detecting/controlling means and controlling the suction pump so that the negative pressure in the pipe is constantly maintained within a predetermined range; and
- causing the resin and lining pig to move through the pipe along the entire length thereof by means of the substantially stabilized pressure differential, so as to form a resin lining layer on the internal surface of the pipe.
- 2. The method as claimed in claim 1, further comprising the step of removing extra resin from the resin-line pipe using a resin receiver which is communicated with the pipe through a connecting means.
Priority Claims (3)
Number |
Date |
Country |
Kind |
6-279253 |
Nov 1994 |
JPX |
|
7-071946 |
Mar 1995 |
JPX |
|
7-267491 |
Oct 1995 |
JPX |
|
Parent Case Info
This is a divisional of application Ser. No. 08/548,300 filed Nov. 1, 1995 now U.S. Pat. No. 5,609,186.
US Referenced Citations (12)
Non-Patent Literature Citations (3)
Entry |
Patent Abstracts of Japan, JP59049870, Mar., 22, 1984. |
Patent Abstracts of Japan, JP60253626, Dec. 14, 1985. |
Patent Abstract, 97200935.1. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
548300 |
Nov 1995 |
|