Abstract:
A method and apparatuses for rehabilitating pipes, conduits, tunnels, culverts, and other such conveyances, particularly for repairing and/or for reinforcing such pipes. A metal or plastic core collapsed around a longitudinal axis adapted to be expanded within the conduit at a site of repair. A cement grout or other suitable material is used to fill the annulus between the expanded apparatuses and the host pipe to form a composite repair/reinforcing structure.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is based upon U.S. Provisional Patent Application No. 61/668,298, filed Jul. 5, 2012, the disclosure of which is hereby incorporated by reference thereto in its entirety, and the priority of which is claimed under 35 USC § 119(e). 
     
    
     BACKGROUND 
       [0002]    The invention relates to methods and apparatuses for rehabilitating pipes, conduits, tunnels, culverts, and other such conveyances, without excavation or dismantling the part of a conveyance. More particularly, the invention relates to methods and apparatuses for repairing damaged, weakened, or leaking conduits with round or non-round shapes, such as a horseshoe or rectangular cross-sectional profile. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0003]    Features and advantages of the present invention will become apparent from a review of the detailed description of exemplary embodiments of the invention, which follows, when considered in the light of the accompanying drawings, in which: 
           [0004]      FIG. 1  is a schematic cross-sectional view of a re-lining arrangement (hereinafter referred to as a sleeve) positioned within a host pipe having a horseshoe cross section, the sleeve being shown in collapsed position; 
           [0005]      FIG. 2  is a cross-sectional view illustrating the same sleeve in the installed position; 
           [0006]      FIGS. 3 ,  4   a , and  4   b  are cross-sectional views of the same host pipe with horseshoe cross section illustrating another embodiment of invention; 
           [0007]      FIGS. 5 ,  6 , and  7  are cross-sectional views of the sleeve positioned within a host pipe having a rectangular cross section; 
           [0008]      FIGS. 8 and 9  are cross-sectional views of the sleeve positioned within a host pipe having a round or oval cross section. 
       
    
    
     DETAILED DESCRIPTION 
       [0009]    Reference is made to U.S. Pat. No. RE30,929 for descriptions of the state of the art in the field of endeavor to which the present invention relates, the disclosure of the patent hereby incorporated by reference thereto in its entirety. 
         [0010]      FIG. 1  shows a repair sleeve  1  or core in the collapsed pre-installation configuration. The sleeve  1  for internal repair pipes, conduits, and tunnels in accordance with the invention is shown positioned within a damaged host pipe  2  having a horseshoe cross section. The repair sleeve comprises of crown segment or segments  3 , invert segment  4 , locking flaps  5 , resilient padding  6  and  7  located at the ends of the sleeve  1 . The choice of sleeve  1  material, for instance PVC, is determined by the chemical regime in the pipe. The thickness of the sleeve  1  material is determined by the dimensions of the host pipe  2  and the external loads applied to said pipe  2 . 
         [0011]    The repair sleeve  1  in the collapsed pre-installation configuration is forming closure which the circumferential length smaller than the circumferential length of the sleeve  1  in the installed position shown in  FIG. 2 . 
         [0012]    In another aspect of the invention, elastomeric or metal strips or hinges  8  join said segments  3  and  5 . 
         [0013]      FIG. 2  shows the repair sleeve  1  in the installed position. In this position, the flaps  5  are fixed in grooves  9  and so forming the close loop configuration with circumferential length of the sleeve  1  larger than in the collapsed pre-installation configuration and the resilient padding  6  and  7  are compressed between the host pipe  2  walls and the repair sleeve  1 . The compressed resilient padding  6  and  7  create reactive force to fix the sleeve  1  in the installed position. 
         [0014]    In another aspect of the invention, one of the locking flaps  5  can be located in the groove  9  in the collapsed pre-installation position. In such a case, only one flap  5  can be considered as a locking flap which is dedicated to increase the circumferential length of the sleeve  1  in the installed position. 
         [0015]    In yet another aspect of the invention, a chemical or cementitious grout can be applied into the space between the host pipe  2  walls, the repair sleeve  1 , and resilient padding  6  and  7 . 
         [0016]      FIG. 3  illustrates an alternative embodiment of the same damaged horseshoe host pipe or tunnel  2  with repair sleeve  10  in the collapsed pre-installation configuration. The sleeve  10  comprises locking flaps  11  located in the crown arch area of the tunnel  2 , invert segment  12 , lateral segments  13 , and resilient padding  14  and  15  located at the ends of the sleeve  10 . In this pre-installation configuration the sleeve  2  has a shorter collapsed perimeter than in the installed expanded position (by consideration that the collapsed perimeter includes the shortest distance “d” between locking flaps  11 ). 
         [0017]      FIGS. 4   a  and  4   b  show the repair sleeve  10  in the installed position. In this position, the flaps  11  passed the straight line where the flaps were being subjected to maximum compression stress because of the largest perimeter with largest distance “D” (see  FIG. 4   a ) and locked in final expanded position with slightly smaller distance “D f ” ( FIG. 4   b ). 
         [0018]    A chemical or cementitious grout can be applied into the space between the host pipe  2  walls, the repair sleeve  10 , and resilient padding  14  and  15 . The grout when it is cured eliminates the resiliency of said padding  14  and  15 , and correspondingly increases the rigidity and structural strength of the repair sleeve  10 . 
         [0019]      FIGS. 5 ,  6 , and  7  in accordance with another embodiment of the present invention, depict the repair sleeve  16  in pre-installation and installed positions in the rectangular tunnel  17 . The sleeve  16  comprises crown segment  18 , invert segment  19 , locking flaps  20  and  21 , and resilient padding  22 . 
         [0020]    A chemical or cementitious grout can be applied into the space between the tunnel  17  walls, the repair sleeve  16 , and resilient padding  22 . 
         [0021]      FIGS. 8 and 9  show a repair sleeve  23  in the pre-installation and installed positions. The sleeve  23  for internal repair pipes, conduits and tunnels in accordance with the invention positioned within a damaged host pipe  24  having a round or oval cross section. The sleeve  23  comprises locking flaps  25  located in the crown arch area of the pipe  24 , segment or segments  26 , and resilient padding  27  located at the ends of the sleeve  23 . The quantity of segments  26  depends on host pipe and/or access point dimensions. In the  FIGS. 8 and 9  are shown three segments  26 . 
         [0022]    In the pre-installation configuration ( FIG. 8 ) the said sleeve  23  has shortest collapsed perimeter because the collapsed perimeter includes the shortest distance “d” between locking flaps  25 . In the installed position ( FIG. 9 ), the flaps  25  passed straight line where the flaps were being subjected to maximum compression stress because of largest perimeter (with largest distance “D”) and locked in final expanded position with slightly smaller distance “D f ”. 
         [0023]    A chemical or cementitious grout can be applied into the space between the host pipe  24  walls, the repair sleeve  23 , and resilient padding  27 . 
         [0024]    The aforementioned sleeves can be installed by the use hydraulic cylinders in horizontal, vertical, or both positions. 
         [0025]    The plurality of the aforementioned sleeves can be installed continuously in the case of the long continuous damage in the host pipe. 
         [0026]    Alternative constructions are also possible without departing from the scope of the invention. 
         [0027]    The invention is not limited to the embodiments described hereinabove, and includes all technical equivalents that fall within the scope of the claims that follow. 
         [0028]    In addition, at least because the invention is disclosed herein in a manner that enables one to make and use it, in view of the particular disclosure of exemplary embodiments, the invention can be practiced in the absence of any additional element or additional structure that is not specifically disclosed herein