DE2403044A1 - METHOD AND DEVICE FOR REPAIRING OLD PIPELINES - Google Patents

Description

GAZ DE FRANCE 23, rue Philibert Delorme, Paris 17eme, France

Method and device for repairing old pipelines

It is known that there is an increasing need results in old pipelines used to transport water, liquid or gaseous fuels, etc. to renew that have either lost their original properties (leaky connections, Corrosion damage, etc.) or their original Properties no longer meet the new needs.

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Postal checking account Munich 2726-834 - Kreissparkasse Stamberg 88940 Deutsche Bank Starnberg 59/17570

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One known technique satisfies this need: it consists in doubling the old pipe made of a rigid material with an inner pipe, the outer diameter of which is slightly smaller than the inner diameter of the first pipe. Semi-rigid materials are usually used to double these pipelines. The relative position of the two pipes defines an annular space, in de ⁿ a filling compound is injected, whose main purposes are the following:

Plaguing the inner pipeline with regard to the outer pipeline and

Use of the mechanical strength of the old pipeline to absorb part or all of the forces, the pressure caused by the transport of the liquids or gases under consideration on the Walls of the inner tube are exercised.

Generally, the filler is a cement-based mixture and is injected in the form of a mortar.

The known method consists in that in the annular space the filling compound with the help of a special pump is introduced. Although the mass is introduced slowly, its density and viscosity require prints, which lead to forces on the wall of the inner tube and can push it in. That forces you to do it for the inside Pipe to use a material that has a sufficient

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Offers firmness to an indentation, though later these properties are useless. In this way, the cost increases by that of the injection alone to meet the loads occurring in the filling compound.

It will also have to be pointed out that the pipe chosen for the inner conduit is all the more rigid and all the more so The more resistant it is, the more difficult it is to introduce into the old pipeline.

The invention avoids the disadvantages described by providing a new filling method for the annular space creates, which enables the use of a material of low mechanical strength for the inner pipeline. The invention also describes a structure for carrying out the method.

The method according to the invention allows during the filling out of the annular space between the outer and the inner pipeline creates a pressure inside the inner one To maintain the pipeline and to adapt this pressure to the properties of the internal pipeline.

In this way, the loads on the wall of the inner pipeline are reduced and controlled.

Therefore, it is possible to select a material with lower mechanical strength than a filling would be the case that does not make use of the method according to the invention.

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In addition, the use of a material of lower mechanical strength facilitates its introduction into the old pipeline.

To enable the application of an internal Pipeline made of a sufficiently flexible and thin material suggests the invention before filling of the annular space with the filling compound, the inner pipeline and the annular space with a pressure medium to fill the pressures contained in the inner conduit and in the annular space Equalize pressure medium and introduce a filling compound under pressure into the annular space, which enables a complete filling, while at the same time a volume corresponding to the filled in Volume of pressure medium is withdrawn, and finally after taking up the filling compound in the annular space to empty the inner pipeline.

The device for carrying out the invention The method comprises a lock chamber and a conduit circuit at each end of the inner pipeline, wherein the annular space is connected to the inner conduit via each of the conduit circuits, each the management circuits at least two taps, of which the one is assigned to the annular space and the other is assigned to the inner pipeline, a tap for venting or draining the circuit, a pressure gauge and additional devices for pressure equalization.

Further features of the invention will become apparent from the following description, with an embodiment of the Inventive device is shown as an example in the drawing.

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It shows

Fig. 1 is a schematic longitudinal section showing the arrangement of the inner pipeline in the old pipeline shows

Fig. 2 is a partial longitudinal section of the ends of a Pipeline in the course of the renovation with the necessary devices for introducing the filling compound.

The central part T. of this inner pipeline consists of a material of low mechanical strength, which is semi-rigid and sufficiently flexible that it can be easily inserted into the interior of the old pipeline. The portion of T ₁ has extended a length slightly less than the piece to be double ligand pipeline 1 and is at its ends by two sleeves 3, ¹ J., Which consist of a material with a more elevated mechanical properties, since the ends of the sleeves Extend beyond the old pipeline and have to accommodate various devices, which requires the _{higher mechanical properties compared to the central part T 1 of} the pipeline 2. The sleeves 3 and 4 are connected in a known manner to the ends A., A ₁ * of the central part T ₁ . The section of the old sewer system 1 to be doubled generally has a length of several tens to several hundred meters.

To attach the old pipeline, open the Ends of the designated sections of the "old pipeline two."

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sufficient trenches and leads the pipeline 2, which comprises the piece T ₁ and the sleeves 3 and 4, through one

the two ends enter the interior of the old pipeline 1 , which is easy because the material used to double the pipeline is pliable enough to slide into the interior of the old pipeline 1 , even if there are bends. It can be seen that the sleeves 3 and 4 partially protrude beyond the old pipeline, where they initially receive connecting parts 5 s 6, which are intended for connection with lock chambers S, S ^f , the role of which is explained below.

It is noted, and this is shown in Fig. 2 that holes are drilled 0 and 0 'prior to insertion of the inner pipe in the wall of the old pipe, which guide for mounting of connections to the A to the provisions for carrying out the method Substances are intended. These openings are sufficient for attaching the connections and are usually no smaller than 25 mm.

After the introduction of the inner pipeline 2, closure pieces 7, 8 are attached in a suitable manner to the ends of the old pipeline, which are intended to ensure the tightness of the annular space between the old and the new pipeline. In addition, they must be compatible with the material of the inner pipeline in order to avoid stresses on the sections of the inner pipeline assigned to the ends of the outer pipeline. They also provide the centering

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the inner pipe in the outer pipe in the viewed section safely and they hold the maximum pressure P level when injecting the filling compound.

As already indicated, two lock chambers S ₉ S ¹ , for example made of steel, are attached to the ends of the inner pipeline. These lock chambers are provisionally mounted on the ends of the inner pipeline via the connecting parts 5, 6. The connection must be tight with respect to the already mentioned pressure P and withstand the effects exerted on the solid plates 5a, 6a which close off the lock chambers S and S ^1. In addition, openings Op and 0 are provided for the lock carriages S and 0 'and 0' for the lock chambers S ¹ .

Pipes 10 are on the openings CL, O ₂ , 0 for the lock chamber S and one end of the old pipeline and on the openings 0 ·, Ο » ¹ , 0, ¹ for the lock chamber S ^f and the other end of the old pipeline 11, ₃ 11 ^f, 12 'fixed to 12 in the lock chamber S and pipes 10 * with the lock chamber S ^1, which lead to taps R., R ", R ,, H ₁ ^1, R ₂ ^1, R ·.

It should be pointed out that the openings 0 'and 0 * are connected to a pipe Ik ^{via the pipes .10', II 1} . The pipe 1 * 1 comprises a regulating _{valve S Q} , which is cut off via a tap R ^, and a drainage or removal line 15, which can be cut off via a tap Rj. It should also be pointed out that a vent or a drain 20 is provided _{behind the tap R 5.} A pressure gauge M * is connected to the pipe 1Ί.

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On the other hand, the openings CK and Op are above a pipe 16 connected to one another, on which an expansion vessel provided with a level control (tap R ") and a bypass (tap Rg) regulator R is arranged. The underside of the expansion tank 17 is connected to the tap R., also located in this section a manometer M .. At l6a is the pump connected for injection of the filling compound.

The regulator R sits between the upper part of the expansion vessel 17 and the tap R ″, against which the pressure is regulated. A manometer M sits between the regulator R and the tap R _p . Furthermore, a vent or drain separated by a tap Rg is provided on the pipe 16 at a high point of the line.

The arrangement now works as follows:

To fill the annular space of a certain section with a filling compound, the following must be used Procedural steps are carried out:

1. Filling the inner pipeline 2 with a pressure medium, which can for example be water;

2. Filling the annular space with a Pressure medium, but not simultaneously with the filling of the inner pipe 2;

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3 · The annular space can also are filled with pressure medium at the same time as the inner pipeline;

4. Then the pressure equalization takes place in both rooms, if necessary with necessary ventilation;

5. The filling compound is then introduced, e.g. injected, while at the same time the pressure medium introduced between the old pipeline and the inner, new pipeline 2 lets escape;

When all these operations are finished and the filling compound is sufficiently set, the process is continued by removing the inside of the inner pipeline The fluid is relaxed and the inner pipeline is emptied.

It should be noted that the procedures are different depending on the relative position of the lock chambers S and S ¹ :

Case 1:

The lock chambers S and S ¹ are at the same height;

Case 2:

The lock chamber S is lower than the lock chamber

Case 3:

The lock chamber S ¹ is lower than the lock chamber

Eb should also be noted that it is also permissible that the gradient between the lock chambers S and S ¹ does not reverse,

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i.e. that between the two lock kairans neither one high-lying noöh a low-lying point available is.

To fill the inner pipeline with liquid, preferably with water, this is introduced through the opening O, via a counter C and the line 12 after the tap R has been opened. The air is vented through the opening O 'for the above cases 1 and 2. In the case where the lock chamber S ^{1 is} lower than the lock chamber S, the valve Rg is used for venting.

Filling can also be accomplished with the aid of a piston 30 arranged in the lock chamber S and ^{displaced into the lock chamber S 1.} In this case, the lock chambers S and S ′ have essentially the same diameter as the inner pipeline 2.

The amount of water entering the inner pipeline is measured with the aid of the counter C.

Then one takes the filling up of the old and the new Pipeline separating annular space before. This penetrates, with the tap R, open, out of the pipe incoming water into the lock gate S.

If the lock chambers S and S 'are at the same level or if the lock chamber S ^{1 is} lower than the lock chamber S, then the one used by the

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Lock chamber S ¹ leaving and through the opening O ', the pipe 11', the cock'R ₅ ¹ , the pipe 14, the pipe 10 ^{f of} the cock R 'and the opening O' formed circle; the venting or the drainage takes place via the opening O _{1 of} the pipe 10 of _{the tap R 1} , the pipe 16, the expansion vessel 17 and the venting tap Rg.

If the lock chamber S is lower than the lock chamber S ', the filling circuit is used, which runs from the opening O ₂ via the pipes 11, 16, 10 to the opening O ₁ , while the vent or the outlet via the opening O ₁ ¹ and the tap R ₁ - takes place. The amount of water introduced into the annular space is also measured here via the counter C.

Simultaneous filling of the inner pipeline and the annular space can be achieved by the presence a substantial shift should be required, such that the internal pipeline is filled up separately hydrostatic pressure caused would be incompatible with the properties of the central part T.

For this procedure, the water is fed in again through the opening 0, with the circle O ₁ ¹ , 0 'in the. Cases where either the lock chamber S and S 'are at the same level or where the lock chamber S ^{1 is} lower than the lock chamber S. In the other case, however, in which the lock chamber S is lower than the lock chamber S', the Circle over 0. and 0 ^. The penetrated water can then fill the interior of the pipeline and the annular space at the same time. The amount of this

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Water is always measured via the counter C.

The pressures are then brought into equilibrium by opening the circle of openings O, O_, as well as O_ ^T and O 'and then the taps R ^ and Rg for a few moments. You always let the water run in. After interrupting the water supply, the pressure is removed at the highest point and the valve S _{0 is} regulated to a previously selected value, which in cases 1 and 2 will be slightly above the _{value read on the manometer H 1} * after the pressure was removed. In case 3 it will be slightly above the hydrostatic pressure of the column formed by the filling compound. However, it may also be necessary to recompress the interior of the inner pipeline 2 against the hydrostatic pressure.

The filling compound is then introduced through the opening CL. During this process, the inner pipeline 2 is kept under pressure via one of the following three circles:

Circuit 1: via the connection O '- O_', ie the inner pipe is placed under the pressure set _{on the valve S Q;}

Circuit 2: via the connection CL - O ₂ , bypassing the controller R; the "pressure in the inner pipe varies like the injection pressure in Oj

Circuit 3: via the same circuit using the controller R, which allows the use of a selected pressure below the injection pressure O, below Consideration of the mechanical properties of the line pipe .

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For each of these circles, the amount of filling compound introduced is measured via the amount of water recovered _{at the outlet of the valve S Q.}

The respective choice of a circuit for maintaining negative pressure of the inner pipeline is the result of an investigation which must take into account:

Properties of the pipe to be lined (compressive strength, Cross-section etc.),.

Selection of materials (inner pipeline, filling compound, etc.),

Filling parameters (pressure, speed, etc.).

The facilities for implementation are determined by the choice of system.

The procedural steps to be carried out for the processing the filling compound can be operated scientifically thanks to the test results and the specially adapted facilities will.

Finally, after a sufficient curing time for the mass, the pressure is removed in the inner pipeline.

The connections O ₁ and 0 are _{then interrupted?} as well as 0 * and 0 "*, the inner pipeline being emptied either via the deepest lock chamber or with the aid of the piston 30, which was used for filling.

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It should be noted that the filling of annular spaces several sections of an old pipeline with an uninterrupted inner pipeline differs from it the procedure for filling the annular space of a single section. In this case the inner pipeline must be constructed in such a way that the Sections outside the old pipeline have sufficient properties to withstand the applied internal pressures to withstand.

The ring-shaped spaces are made up of compensation circles, which contain the necessary dividers, connected to one another. These annular spaces are filled by starting with whoever is responsible for the connection, through which the inner pipeline is pressurized, is furthest away, noting that the Direction of flow of the filling compound from the injection point to the Connection runs when circuit 1 is used and in the opposite sense when circles 2 and 3 are used.

The invention is not limited to the embodiment shown and described in detail, since various Embodiments are conceivable without the frame to leave the invention.

Patent claims:

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Claims (1)

Patent claims: Method for filling the annular space between a defective pipeline and an internal pipeline inserted into it, characterized in that the inner conduit made of a flexible and thin material (2) and the annular space between this and the outer pipe ^ with one preferably liquid pressure medium are filled, with a pressure equalization between the pressure medium in the inner pipeline and which is made in the annular space that in the annular A filling compound is introduced under pressure to completely fill it, whereby at the same time an amount of the pressure medium corresponding to the introduced filling compound is displaced or is withdrawn and that after the setting of the filling compound located in the annular cavity the inner pipeline is emptied. 2. The method according to claim 1, characterized in that the amount of in the annular space introduced, for example, injected filling compound over the amount of the annular space from this displaced or withdrawn pressure medium is measured. 409830/04 3 24030A 3. Apparatus for carrying out the method according to claim 1 and 2, characterized in that a lock chamber (S, S ¹ ) and a line circuit are provided at each end of the inner pipe (2), the annular space with the inner pipe over each of the line circuits can be connected, and that each line circuit has at least two taps (R ₁ , R-; R ₁ ', Rp'), one of which is assigned to the annular space and the other is assigned to the inner pipeline and that each line circuit has a vent valve ( R ₁ -; Rg) ₉ comprises a pressure gauge (M · M ¹ ) and additional elements for pressure equalization. ή. Device according to claim 3, characterized in that that between the inner pipe (2) and the outer pipe (1) at each end of the last Closure devices (7; 8) are provided, which 8ο are designed so that they can do so while filling out the form given of the annular space with the filling compound Withstand pressure. 5. Apparatus according to claim 3, characterized in that that at the end of the pipeline at which the introduction of the filling compound takes place, the lock chamber (S) with the ring-shaped space connecting the line circuit with an expansion vessel (17) and a pressure regulator (R) is provided. 6. Apparatus according to claim 3 »characterized in that at the other end of the pipeline the line circuit is provided with a regulating valve (.Sq) serving to maintain the pressure in the annular space during the filling time. 409830/0431 7. Apparatus according to claim 5 and 6, characterized in that that one of the lock chambers (S) is provided with a feed line for the pressure medium is which a counter (C) for determining the amount of in the inner pipe (2) and / or having pressure medium contained in the annular space. 8. Device according to one of claims 5, 6 and 7, characterized characterized in that the "line circuit at one end of the pipeline has one for introducing the Has filling compound serving input, which with the expansion tank for the purpose of aligning the Pressure of the filling compound is connected to the pressure of the pressure medium in the annular space. 22nd of January 409830/0431 4 » Blank page