CZ284094A3 - Method of sealing defective underground pipeline for transport of liquid medium - Google Patents

Abstract

Sealing of defective subsurface pipelines for transport The liquid medium is introduced into the defective section the pipe strand and pipe in this section blind on one end with vent hole, at the other end with a filling hole through which the piping is filled with overpressure a liquid sealant mixture, whereupon the excess sealant mixture is made of the pipe is drained and the sealed pipe section is cleaned from of the sealing compound with a cleaning tool, drawn through the established cable

Description

BACKGROUND OF THE INVENTION

The invention relates to a method of sealing a defective subsurface pipe for conveying a liquid medium by means of a liquid sealant.

BACKGROUND OF THE INVENTION

The prior art methods of sealing a defective subsurface pipeline intended for conveying liquid media require the identification of the failure site, the uncovering or stripping of the pipeline, and making available to remedy the failure by some of the known traditional methods, e.g. These known methods are disadvantageous due to their laboriousness, in particular in that the uncovering of the pipeline is associated with the devastation of the road terrain, etc. The removal of pipeline defects by these procedures is usually always associated with the closure of the roads in the affected section. More modern known mechanized methods of sealing defective subsurface piping utilize remote controlled devices to apply sealant or spray coatings to the inner walls of the pipeline. However, these sealing methods are not applicable to sealing larger cracks or leaks caused by destruction of a larger area. In addition, they are very expensive both in terms of the technical equipment required and in terms of the required special sealants suitable for spraying or painting.

SUMMARY OF THE INVENTION

According to the invention, the method of sealing a defective subsurface pipeline for conveying a fluid medium is to first introduce a cable into the defective pipeline section, then blind the pipe in this section at one end with a venting hole and at the other end with a filling hole . In this way, the section of the defective pipeline under pressure is filled with the liquid sealing compound, by means of which the sealing compound penetrates through the leaking points of the pipeline all the way to their outer surroundings, thereby filling the liquid mixture. Excess liquid sealant is then pumped out of the duct and the sealed duct section is cleaned of residual sealant with a cleaning tool drawn through the introduced cable. The advantages of sealing a defective subsurface pipe by the method of the present invention are particularly significant in the economic field. Defective pipeline sections are sealed without exposing, that is, without affecting public roads, open spaces, green areas, etc., and without disturbing or devastating the environment. The 100% sealing efficiency achieved in this way and its preventive effect are also important.

DETAILED DESCRIPTION OF THE INVENTION

Practically, the method of sealing a defective subsurface pipeline can be realized by introducing a cable into the defective pipeline section defined by two inlets, for example inlet shafts, and the pipe in this section and the cable is blinded at one end by a blanking plug with a vent hole and the other blanking plug with filling hole. The filling orifice is then connected to the filling opening by a hose or pipe with an accumulation vessel located above the _B terrain. With this device, the defective pipeline section is then filled through the accumulation vessel with a sealant mixture, for example on ash-cement basis, which, due to overpressure, penetrates leaking and damaged piping points into their external surroundings and at the same time fills all spaces and caverns in the immediate surroundings liquid medium that is conveyed by pipeline or surface water flow. As the pipe section is gradually filled with sealant, air is expelled from the pipe through the vent hole in the blanking insert. The vent hole is only sealed when the sealing mixture starts to flow out. After the necessary time, which is necessary to fill the surroundings of the damaged pipeline section under pressure, has elapsed and the sealant level in the accumulation vessel stabilizes, the blanking inserts are removed and the excess sealant is pumped off eg by a mobile suction pump. Finally, a cleaning tool, which may preferably be a foam disc, is fastened to one end of the cable that has been introduced into the defective duct section, and by pulling it, the sealed duct section is cleaned and freed from the remainder of the sealant.

Industrial applicability

The process according to the invention can be used everywhere to seal the piping leaks of low-pressure pipelines for conveying liquid media and guided under the ground, such as sewer pipes, industrial waste pipes, drainage pipes, drinking or service water supply lines and the like.

TV 2. & ί, 0- $ ί,

Claims (1)

PATENT CLAIMS i Method of sealing a defective subsurface pipeline for conveying a liquid medium, characterized in that a cable is introduced into the defective pipeline section, the pipe in this section being blinded at one end with a venting hole and at the other end with a filling opening. The pressurized mixture penetrates the sealing mixture through the leaking points of the pipeline to their external surroundings, thereby filling the liquid mixture, whereupon the excess sealing mixture is drained from the pipeline and the sealed pipe section is cleaned of residual sealing mixture by a cleaning tool drawn through the cable.