Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1989-07-13
1991-10-08
Watson, Robert C.
Metal working
Method of mechanical manufacture
Assembling or joining
29234, B23P 1702
Patent
active
050541870
DESCRIPTION:
BRIEF SUMMARY
This invention is to do with a new method and a new kind of equipment for the remote-controlled installation of sheathing for the renovation of pipelines.
PROBLEM
The problem which has been in existence up to now and which can be solved with this invention is the renovation of damaged pipelines with formation of fragments, if the diameter of the pipe is small and the pipe cannot be entered for the purpose of repair. The repair equipment must therefore be able to be inserted into a pipeline of small diameter, be remote-controlled and also have the advantage against the known methods that also severely damaged pipes with formations of fragments can be repaired. The conventional methods (summarized below) only offered an unsatisfactory solution, because it was precisely the washing out which removed the fragments and thus a larger leak formed, which then could no longer be repaired.
STATE OF TECHNOLOGY
The current start of technology means that renovations of slightly damaged pipes are carried out in two steps:
1. Preparation of the renovation
Treatment and cleaning of the damaged parts (drilling, washing, suction etc.)
2. Actual renovation
Application of filling material (plastics, adhesives, products from cement chemistry etc.). traditional procedure, but not cases in which fragments or even entire parts of pipes are missing. This invention now promises the long sought for solution.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view of the insertion device
FIG. 2 is a top view of the locking mechanism
FIG. 3 is a top view of the robot device.
The invention consists of both a method and the accompanying application apparatus. The method basically consists of a corrugated metal sheet being inserted into the damaged pipe with an apparatus by the metal sheet being bent in such a way that it also forms a pipe, only with a smaller diameter. This compressed sheet is now placed in the position in the pipe to be renovated, which has broken, and in which the pipe fragments have possibly already been washed away. Here the pressure is released with which the sheet has been pushed together, whereupon it opens like a spring and forms a pipe with a larger diameter. This sheet is then prevented from opening further by the existing pipe and thus forms the sheathing of the defective pipe at the point of damage. The sealing mass is now pressed through the holes in the metal sheet and fills the space between the earth and the sheathing. The sheathing, which consists of the bent metal sheet, can now be left in the pipe without any difficulties, because the metal chosen is completely rustproof. For this reason, the trade speaks in such cases of a lost sheathing.
In extreme cases, in which whole parts of a pipe have been washed away, more than one metal sheathing can be inserted, which then overlap like roof slates and can thus form a complete pipe.
In order to use this method, an application apparatus is necessary, with the help of which the metal sheet is firstly inserted into the pipe and then put into the correct position.
This apparatus is thus for insertion, positioning and application of the metal sheathing. It consists of a casing 2 (FIG. 1) and a mechanism to hold the sheet. The casing has two pins 3 and 5 on top (FIG. 2) with a semi-circular cross-section, which are a part of the locking mechanism. The application apparatus is attached by means of the holes 15 and 10 to a channel renovation robot, already patented by the same inventor--but can also be used in combination with conventional luges or operated by hand. For control and supervision purposes, extension arms can be fixed to the front of the application apparatus (in FIG. 1 on the right) and a television camera is then fitted to them. This camera looks into the opposite direction, which means that the metal sheathing wound around it becomes visible. The latter is fitted with holes, which are used later for the pressing of the sealing mass. It is through precisely these holes that we can see with the help of the camera whether the damaged part of th
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Sika Robotics AG
Watson Robert C.
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