Installation of flexible lining with flexible collar for lining lateral pipelines

Abstract

A method for installation of a flexible resin impregnable liner for lining a lateral pipe which leads into a main pipe having at one end a flexible collar for installation at the location where the lateral liner meets the main, wherein after installation the collar extends along the interior of the main seating against the opening of the lateral. The flexible liner is installed by inserting the liner into the lateral pipe and using fluid under pressure to expand the lining against the lateral wall to form seals with the collar at the lateral/main pipe junction.

1 . A method of lining a lateral pipe leading into a main pipe from the main pipe out, comprising: 
 providing a resin impregnated lateral lining tube of finite length and open ended having at one end a collar of resin impregnated material with a central opening, the collar at the end of the lateral adapted to extend into the main pipe and contact the interior surface of the main pipe at the location where the lateral meets the main pipe with the opposite end of the lateral lining extending into the lateral,    positioning the collar in the main pipe at the entrance to the lateral with the opening in the collar aligned with the lateral;    inserting the lateral lining tube into the lateral pipe using a fluid medium under pressure to evert the lateral lining tube through the opening in the collar, applying pressure to the lateral lining tube,    applying pressure to the collar on the surface of the main pipe to urge the collar against the main pipe; and    curing the resin in the lining tube and collar to form a seal at the location where the lateral meets the main pipe.    
     
     
         2 . The method according to  claim 1 , wherein the seal is formed by an inflatable means, said means being inflated by the fluid medium used for inserting the lateral lining, but at a lower pressure.  
     
     
         3 . The method according to  claim 1 , wherein the fluid medium is supplied to insert the lateral lining, by means of a pressure pipe, and at least one additional pressure pipe extends past the seal arrangement so that pressure fluid can be applied to another lateral lining remote from the first mentioned lateral whilst curing of the first mentioned lateral lining is taking place.  
     
     
         4 . The method according to  claim 2 , wherein the inflatable means comprises a bag or bladder which is inflated against the main pipe surface.  
     
     
         5 . The method according to  claim 4 , wherein the bag or bladder is in the form of a pair of spaced diametrically opposed inflatable pillows.  
     
     
         6 . The method according to  claim 1 , including applying pressure to the collar by an inflatable means which is a bag or bladder.  
     
     
         7 . The method according to  claim 6 , including pressing the collar against the main pipe by an inflatable means connected to an elbow pipe and inverting the lateral lining through the elbow pipe into the lateral.  
     
     
         8 . A method according to  claim 1 , wherein the seal is formed by use of an elbow pipe to position the lateral lining at the entrance to the lateral and through which the lateral lining is everted to be inserted into the lateral.  
     
     
         9 . The method according to  claim 1 , wherein the step of curing includes circulating at least one of hot water, steam, hot air or mixtures thereof into the lining tube.  
     
     
         10 . The method according to  claim 1 , wherein the step of applying pressure includes at least applying one of pressurized water and gas.  
     
     
         11 . A method of lining a lateral pipe leading into a main pipe, comprising: 
 providing a resin impregnated lateral lining tube of finite length and open ended and having at one end a collar of resin impregnated material with a central opening, the collar at the end of the lateral adapted to extend into the main pipe and contact the interior surface of the main pipe at the location where the lateral meets the main pipe with the opposite end of the lateral lining extending into the lateral,    inserting the lateral lining tube into the lateral pipe with the collar at the entrance to the lateral with the opening in the collar aligned with the lateral,    applying pressure to the lateral lining tube to urge the lining tube against the lateral,    applying pressure to the collar on the surface of the main pipe to urge the collar against the main pipe; and    curing the resin in the lining and collar.    
     
     
         12 . The method according to  claim 11 , including applying pressure to the collar by an inflatable means which is a bag or bladder.  
     
     
         13 . The method according to  claim 12 , including pressing the collar against the main pipe by an inflatable means connected to an elbow pipe and inverting the lateral lining through the elbow pipe into the lateral.  
     
     
         14 . A method to  claim 6 , wherein the seal is formed by use of an elbow pipe to position the lateral lining at the entrance to the lateral and through which the lateral lining is everted to be inserted into the lateral.  
     
     
         15 . The method according to  claim 11 , wherein the seal is formed by an inflatable means, said means being inflated by the fluid medium used for inserting the lateral lining, but at a lower pressure.  
     
     
         16 . The method according to  claim 11 , wherein the fluid medium is supplied to insert the lateral lining, by means of a pressure pipe, and at least one additional pressure pipe extends past the seal arrangement so that pressure fluid can be applied to another lateral lining remote from the first mentioned lateral whilst curing of the first mentioned lateral lining is taking place.  
     
     
         17 . The method according to  claim 16 , wherein the inflatable means comprises a bag or bladder which is inflated against the main pipe surface.  
     
     
         18 . The method according to  claim 17 , wherein the bag or bladder is in the form of a pair of spaced diametrically opposed inflatable pillows.