Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1988-09-30
1990-01-16
Echols, P. W.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
2940209, 2940218, 295272, B21D 5300
Patent
active
048933899
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
(1) Field of the Invention
This invention relates to methods for reinstatement of lateral branch connections in relined sewers or pipes.
(2) Prior Art
Patent Specification AU-B42585/85 (558128) and EP 0184366, both by Danby Pty. Ltd., disclose a method for relining sewers and pipes where a PVC liner strip is wound to form a tubular liner in a continuous length in the sewer, the liner is pressurized and grout is pumped into the cavity between the liner and the sewer wall and allowed to set.
This method is particularly successful for relining damaged or corroded sewers, the lateral branch lines to the sewers are closed off and must be reinstated (i.e. reconnected) to the relined sewer.
SUMMARY OF THE PRESENT INVENTION
It is an object of the present invention to provide a method for the reinstatement of the lateral branches to the relined sewer or pipe.
It is a preferred object that the method be relatively simple and inexpensive.
It is a further preferred object that the method be effected during the relining of the main sewer or pipe.
Other preferred objects of the present invention will become apparent from the following description.
In one aspect the present invention resides in a method for the reinstatement of lateral branch connections in relined sewers or pipes including the steps of:
sealing the connection of the lateral branch to the sewer or pipe before a liner has been grouted in the sewer or pipe;
removing the seal after the liner has been grouted in the sewer or pipe at the connection and the grout has at least initially set;
cutting out a pilot hole, aligned with the lateral banch, through the grout and the liner in the sewer or pipe with a first cutting tool fed down the lateral branch; and
cutting out the grout and the liner with a second cutting tool, fed towards the lateral branch from the sewer or pipe, to open the pilot hole to substantially the diameter of the lateral branch to reinstate the connection.
Preferably the branch line is sealed from the main sewer or pipe by inserting an inflatible plug down the branch to the top of the PVC liner in the sewer or pipe before the grout is pumped into the sewer or pipe. Preferably grout is pumped through a hollow rod placed down the branch to seal the junction of the branch with the sewer and is allowed to set (the inflatible plug then being removed).
In a second aspect the present invention resides in a method for the reinstatement of lateral branch connections in relined sewers or pipes including the steps of:
after a liner has been positioned in the sewer or pipe, but before the liner is grouted in the sewer or pipe, cutting a pilot hole, aligned with the lateral branch, through the liner with a first cutting tool fed down the lateral branch;
sealing the pilot hole to the lateral branch;
removing the seal after the liner has been grouted in the sewer or pipe at the connection and the grout has at least initially set; and
cutting out the grout and the liner with a second cutting tool, fed towards the lateral branch from the sewer or pipe, to open the pilot hole to substantially the diameter of the lateral branch to reinstate the connection.
Preferably the branch line and the pilot hole are sealed by an inflatible plug down the branch line. Preferably the grout is pumped into the cavity between the liner and the sewer wall from the nearest manhole to fill the cavity. The inflatible plug is preferably removed when the grout has initially set.
In a third aspect the present invention resides in the apparatus for effecting the method.
BRIEF DESCRIPTION OF THE DRAWINGS
To enable the invention to be fully understood, a number of preferred embodiments will now be described with reference to the accompanying drawings, in which:
FIG. 1 is a sectional side view of the main sewer and lateral branch line after the liner has been grouted in position in the first preferred method of the present invention;
FIG. 2 is a similar view showing the cutting of the pilot hole;
FIG. 3 is a similar view of the reaming out of the conne
REFERENCES:
patent: 4321740 (1982-03-01), Davis et al.
patent: 4377896 (1983-03-01), Cox
patent: 4394202 (1983-07-01), Thomas et al.
patent: 4397890 (1983-08-01), Kinumoto et al.
patent: 4410391 (1983-10-01), Thomas et al.
patent: 4678370 (1987-07-01), Allen
patent: 4728223 (1988-03-01), Rice
patent: 4767236 (1988-08-01), Rice
"Salvaging a Broken-Down Sewer", Engineering News Record, Nov. 19, 1959, pp. 98-99.
Allen Peter
Molyneux Sydney
Cuda Irene
Echols P. W.
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