BG61010B1 - Method for the restoration of filled up pipelines - Google Patents

Abstract

The method is used in civil engineering for the restoration of small-diameter pipelines. By simplified equipment it secures smooth and compact inner surfaces in long sections of the pipeline. By the method the inner surfaces of the pipeline (1) is cleaned after which two groups of flexible longitidinal pipes (7) are inserted and an inflatable polyethylene bag (2) in uninflated state is fitted between them. Bag (2) is sealed by means of covers (3) and the space between its external walls and the internal walls of the pipeline (1) is sealed by other covers (8). Supports (12) guarantee stability of the structure. The inflatable polyethylene bag (2) is filled by supplying water across an inlet pipe (4) at open outlet bleeding pipe (6) until it is completely filled and water starts running through the bleeding pipe (6). Pipe (6) is closed and the water supply continues until pressure of 0.5 atm. is achieved after which the inlet pipe (4) is closed and the water impermeable material (11) is supplied across injection pipe (9) at open bleeding pipe (10). The supply is discontinued after part of the solution (11) comes out across the hole of the bleeding pipe (10). It is waited until the cement mortar (11) acquires strength after which water (5) from the bag (2) is discharged and the supplementary pieces of equipment are dismantled. The polyethylene bag (2) remains in the pipe (1), tightly bound to the cement lining.

Description

The invention relates to a method for the restoration of backfilled pipelines for use in construction, in particular for the recycling of low-pressure, low-pressure backfilled pipelines.

BACKGROUND

OF TECHNIQUE

There is a known method for the restoration of backfilled small-diameter pipelines, which, after cleaning the inner surfaces of the pipes, inserts a rubber sleeve into them, which subsequently adheres to the walls of the pipeline by inflating under pressure a further plastic sleeve inserted therein, that sticks to the inner surface of the rubber sleeve. / 1 /

A disadvantage of the known method for the restoration of backfilled pipelines is that since the inner surface of some, for example, concrete, pipelines is of increased roughness, and in places of joints there are wide sections with different diameters, poor adhesion of the rubber sleeve is possible. Furthermore, after cleaning, complete drying of the inner walls is difficult, which can also lead to a lower quality of adhesion and hence to a reduced reliability of the resulting coating.

There is also a method of restoring backfilled small-diameter pipelines, where after cleaning the inner surface of the pipeline, an inflatable sleeve is pre-disposed therein, and water, eg cement-sand, is fed through channels formed between the inner surface of the pipeline. the conduit and the outer wall of the inflatable sleeve, which at one end is fixed to the inner surface of the tube and is provided with umbilical separators spaced along its entire outer surface, which facilitates the formation of these channels. The inflatable sleeve is pre-formed of sheet material with a width equal to the inner circumference of the section of the pipeline plus seam allowance.

The material is folded into a flexible sleeve and sewn securely along the entire working length. The inflatable sleeve is kept inflated during the delivery of the waterproof solution by a pressure of half to one atmosphere greater than the pressure of the waterproof solution supplied. After filling the space between the inner wall of the pipeline and the outer wall of the inflatable sleeve, the flow of solution is stopped, the applied layer is expected to gain strength, after which the inflation of the sleeve is stopped and the additional equipment is removed / 2 /.

A disadvantage of the known method for the restoration of backfilled pipelines is that it is of limited applicability as it requires special sheet material with umbilical spacer elements. This method is difficult to apply to long sections of the pipeline because in large sections with damage it is possible to locally hose the sleeve to the inner surface of the pipeline and interrupt the path of the water-soluble solution, which degrades the quality. In addition, the use of a flexible seam sleeve along the entire working length reduces the possibility of processing long sections and further reduces the quality, since the seam position is vulnerable to keeping the sleeve inflated and during the injection of the solution.

It is an object of the invention to provide a method for the restoration of backfilled pipelines of improved quality and efficiency, implemented with simplified facilities and allowing the recovery of long sections of the pipeline.

TECHNICAL NATURE OF

THE INVENTION

This task is solved by creating a method for the restoration of backfilled pipelines, in which the internal surfaces of the pipeline are cleaned and subsequent lining by application of waterproof material. The pipeline is pre-positioned at one end of the pipeline, which is held in the inflated state during the application of the waterproof material with a seamless inflatable sleeve by supplying a pressure greater than 3 the position of the flowing material, which lies between the inner wall of the pipeline. the conduit and the outer wall of the inflatable sleeve. Once this space is filled, the waterproofing material supply is stopped and waited for it to gain strength, then the hose inflation is stopped and the inflation material and accessories are removed. The inflatable sleeve is also pre-fixed to the other end of the section of the pipeline to be reclaimed, after which, after cleaning, flexible longitudinal pipes with an outer diameter equal to the thickness of the liner are inserted uniformly over the pipeline. An inflated sleeve is inserted between them and the inflated section of the pipeline and the inflated sleeve portion are reversed at both ends, and the inflated sleeve is inflated with a predetermined pressure, after which the watertight material is injected.

An advantage of a method of restoring backfilled pipelines is that it provides a smooth and dense interior surface through simplified facilities, which increases the efficiency and quality of the restoration and makes it possible to recover long stretches of the pipeline.

DESCRIPTION OF THE ANNEXES

FIGURES

The invention is explained in more detail in the accompanying drawings, of which:

Figure 1 is a longitudinal row of the facilities by which the method of restoring backfilled pipelines is implemented;

2 is a cross-sectional view of the same gears.

EXAMPLE OF IMPLEMENTATION

OF THE INVENTION

The embodiments of the figures implementing methods for restoring backfilled pipelines 1 consist of a polyethylene seamless inflatable sleeve 2, backed by flap sides 3. One of the flaps 3 is provided with an inlet tube 4 to fill the sleeve 2 with fluid 5, e.g., water and the other is provided with an outlet vent pipe 6. Between the outer surface of the sleeve 2, the inner surface of the conduit 1 is evenly spaced, connected meridianly by perforated connections, in the upper and lower groups, with flexible longitudinal tubes 7. At both ends of the tube orifice 1, at its periphery there are annular caps 8, one of which is provided with an injection pipe 9 and the other with an air duct 10. The distance between the outer surface of the sleeve 2 and the inner surface of the conduit 1 is filled with a waterproof material 11, for example cement solution. Adjustable supports 12 are fitted to covers 3 and 8. The section of pipeline 1 is underground and is sandwiched between two inspection shafts 13.

SUMMARY OF THE INVENTION

The method of restoring backfilled pipelines is as follows.

After cleaning the inner surface of the pipeline 1, for example, by intensive flushing, two groups of flexible longitudinal tubes 7 are inserted therein, and the inflated polyethylene sleeve 2 is inserted between them in a non-inflated state.

The presence of two groups of flexible longitudinal tubes 7 makes it possible to adjust the duct formed by them to the inner surface of pipeline 1. This would not be possible if the tubes 7 were in a generally connected "sock" construction, since the diameter of this As a rule, the "sock" does not match the different internal diameters of the pipelines. The positioning and fixing of the lower group of flexible longitudinal tubes 7 in the lower part of the pipeline 1 is facilitated by the effect of gravity on their mass. The upper group of flexible longitudinal tubes 7 is pre-positioned on the upper surface of the inflatable sleeve 2 and, after applying pressure therein, is also conveniently and easily fixed to the upper inner surface of pipeline 1. The tubes 7 are hollow but are selected with a suitable bearing capacity, which does not allow them to deform significantly as they are pressed between the inner surface of the pipe 1 and the outer surface of the sleeve 2. It is trapped by the lids 3 and the space between its outer walls and the inner walls of the pipe 4 the pipeline 1 is jammed with the covers 8. The supports 12 provide stability of the structure. Subsequent filling of the inflatable polyethylene sleeve 2 is carried out by supplying water through the inlet pipe 4 with the outlet vent pipe open 6 until the sleeve is filled and water leaks through the vent pipe 6. It is then closed and the water supply continues. pressure half atmosphere. The inlet tube 4 is then closed. The waterproofing material is introduced into the grout 11 through the injection pipe 9 with the vent pipe 10 open. The solution penetrates into the channels formed by the pipes 7, including through the meridional perforated connections. Submission is terminated after part of the solution 11 exits through the opening of the vent pipe 10. Wait for the cement mortar 11 to gain strength, then drain the water 5 from the sleeve 2 and remove the auxiliary equipment. The polyethylene sleeve 2 remains in the pipe 1, firmly connected to the cement lining. The completed restoration of Pipeline 1 is provided with a smooth interior surface and increased impermeability due to the ensured possibility of full filling of all cracks in a static position. Simple facilities are used.

Claims

Claims (1)

A method of restoring backfilled pipelines, in which the internal surfaces of the pipeline are cleaned and subsequently coated by application of a waterproof material, having previously fixed to the pipeline at one end of the pipeline maintained in the inflated position during sowing. watertight material inflatable sleeve by supplying a pressure greater than the pressure of the supplied watertight material which is located between the inner wall of the pipeline and the outer wall at 10 n the adductor sleeve, and after that space is filled, the supply of waterproof material is discontinued and waited for it to become rigid, after which the inflation of the sleeve is discontinued and the inflatable material and up to 15 filling equipment are removed, characterized in that the inflatable sleeve (2), which is seamless, is also pre-locked to the other end of the section of the pipeline (1) to be recessed, into which, after cleaning, it is inserted evenly over the inner surface of the pipeline (1), flexible over narrow pipes (7) with an outer diameter equal to the thickness of the lining, and between them the inflated sleeve (2) is inserted in the non-inflated state, after which the section of the conduit (1) and the section of the inflated sleeve (2) back into it both ends and the inflatable sleeve (2) inflate at a predetermined pressure, after which the waterproof material is injected. Attachment: 2 figures