DE20305352U1 - Well delivery pipe comprises at least two pipe segments whose joint is sealed by means of rings, tapes or a compound which swell when in contact with water - Google Patents

Abstract

The well delivery pipe comprises at least two pipe segments whose joint is sealed by means of rings, tapes or a compound which are capable of swelling when in contact with water.

Description

The present invention relates to one of at least two pipe sections sealingly connected to one another Existing well pipe made of steel or plastic.

Well pipes of the generic type are known per se and are drilled in a correspondingly deep earth introduced to clean groundwater from correspondingly deep layers of groundwater promote to be able to.

Such a well extension pipe passes through various geological layers and if necessary also different groundwater levels.

Because the groundwater storeys close to the earth's surface generally lead to less clean water, it is important that penetration of groundwater from these higher groundwater layers both in the basic area of the borehole and in the interior of a well expansion pipe is prevented.

The measures applied so far for sealing the individual pipe sections in the mutual connection area can despite great care do not completely exclude the risk of small leaks during assembly, so that under unhappy circumstances less clean ground water through the interior of the well pipe can penetrate into the base area of the borehole.

The present invention lies the task underlying a well expansion pipe of the generic type to demonstrate where the tightness in the connection area of the individual Pipe sections to each other is significantly improved.

This object is achieved according to the invention solved, that the Pipe sections with each other through water-swellable sealing rings, sealing tapes or a water swellable Sealant are sealed against each other.

This type of sealing will the unwanted Penetration of groundwater into the interior of the well pipe largely reliable prevents the sealant from coming into contact with external Swell up groundwater and increase the sealing effect.

Sealing rings or are preferred sealing tapes made of poly-chloroprene.

If a water-swellable sealant for If it is used, it advantageously consists of polyurethane.

Other features of the invention are Subject of further subclaims.

Embodiments of the invention are included in the Drawings are shown and are described in more detail below.

Show it:

1 a schematic partial representation of a well extension pipe according to the invention in the connection area of two pipe sections, partly in section;

2 an enlarged partial view of the in 1 detail marked II;

3 one of the 2 corresponding representation according to a further embodiment of the invention;

4 an enlarged partial section through the connecting area of two pipe sections of a well pipe according to the invention according to a further embodiment of the invention and

5 one of the 4 corresponding partial section through a well extension pipe according to a further embodiment of the invention.

In 1 is designated by the reference numeral overall a well expansion pipe, which consists of several pipe sections sealed together, wherein in 1 Two such pipe sections are shown, which are identified by the reference numerals 2 and 3 are provided.

Such a well extension pipe 1 , which in practice consists of a large number of interconnected pipe sections, is introduced into a borehole prepared on the ground side, the diameter of the borehole being larger than the outside diameter of the well extension pipe 1 ,

After the correct installation of the well pipe 1 in a borehole it is necessary to place the annular gap between the well pipe 1 on the one hand and the borehole on the other hand to be filled with a seal so that relatively impure groundwater in groundwater layers that are relatively close to the earth's surface cannot flow into deeper, clean groundwater layers that lead to clean groundwater.

This sealing filling is carried out in practice by introducing filling compounds into the said annular gap, the aim being to make these filling compounds as tight as possible with the well pipe 1 to connect in order to also allow contaminated or less good groundwater to seep through between the outer surface of the well pipe 1 and to prevent the filling compound itself.

In order to be able to achieve this desired tight connection, the pipe sections are 2 and 3 (and all other pipe sections of a well expansion pipe 1 ) in the area of its outer surface with a mechanical roughening by sandblasting or the like 4 (please refer 2 ) and / or with a mass consisting of sand and binders 5 coated (see 3 ).

By mechanical roughening and / or coating with a mass 5 the outer surface of the pipe sections is made of sand and binders 2 . 3 ideally prepared for an intimate connection with a filling compound between the borehole on the ground side and the well pipe 1 , because the outer surface by the measures described men is considerably enlarged compared to a smooth pipe and also largely fissured, so that there is an intimate bond between this roughened outer surface and a corresponding backfill.

Preference is given to coating with a mass 5 a binder based on an epoxy resin or an epoxy resin mixture is used from sand and binders, since on the one hand this ensures good adhesion of the mass 5 on the outer surface of a pipe section 2 or 3 results and in addition, an epoxy resin-based binder does not affect the quality of the groundwater.

To prevent the unwanted penetration of groundwater into the interior of the well pipe 1 to prevent it is necessary to the individual pipe sections 2 and 3 to seal them perfectly in their respective connection area.

For this purpose, according to the exemplary embodiment of the invention 4 a sealing ring 6 made of a water-swellable material. This sealing ring 6 is in an annular groove 7 of a pipe section 2 is inserted and is surrounded by a peripheral web 8th of the other pipe section 3 covered. The two pipe sections 2 and 3 are in the connection area with a thread 9 provided and screwed together.

The sealing ring 6 is preferably made of poly-chloroprene, a rubber-like plastic that swells by a certain amount when it comes into contact with water and thus a perfect seal between the two pipe sections 2 and 3 causes.

In the embodiment according to 5 is that between the two pipe sections 2 and 3 intended area of the thread 9 with a sealant 10 coated with water-swellable material, which preferably consists of polyurethane. This sealant 10 can cover the entire area of the thread 9 be applied so that there is a very large sealing distance here. But it is also possible to have only a few threads of the thread 9 with such a sealing compound 10 to ensure sufficient sealing of the two pipe sections 2 and 3 to ensure each other.

The measures described ensure in a simple manner that neither on the outside of the well extension pipe 1 through the interior of the groundwater from higher groundwater layers down into the production area of the well extension pipe 1 can penetrate.

In deviation from the exemplary embodiments shown, individual pipe sections of a well expansion pipe can 1 also be connected to one another via pull-resistant push-in joints (ZSM connections for short). Here too, water-swellable sealing rings, sealing tapes or sealing compounds can be used with a corresponding advantage.

Another variant of the illustrated embodiments can be that a sealing ring 6 is inserted into the sleeve-like area of a pipe section and rests sealingly on the smooth-walled area of the area of the other pipe section engaging in the sleeve like a shaft.

Claims (9)

From at least two pipe sections connected to each other in a sealing manner ( 2 . 3 ) existing well extension pipe ( 1 ) made of steel or plastic, characterized in that the pipe sections ( 2 . 3 ) with each other through water-swellable sealing rings ( 6 ), Sealing tapes or a water gellable sealant ( 10 ) are sealed against each other. Well removal pipe according to claim 1, characterized in that the sealing rings ( 6 ) or the sealing tapes are made of polychloroprene. Well expansion pipe according to claim 1, characterized in that the sealing compound ( 10 ) consists of polyurethane. Well expansion pipe according to one of the preceding claims, characterized in that the pipe sections ( 2 . 3 ) in the mutual connection area with thread ( 9 ) are provided and screwed together. Well expansion pipe according to claim 1 or 2, characterized in that the sealing rings ( 6 ) in a circumferential ring groove ( 7 ) of a pipe section ( 2 ) inserted and from a peripheral web ( 8th ) of the other pipe section ( 3 ) are covered. Well expansion pipe according to claim 1 or 2, characterized in that the sealing rings ( 6 ) are placed in a circumferential annular groove of a sleeve-like end of a pipe section and lie sealingly on a cylindrical section of the end of the other pipe section protruding into the sleeve-like area. From at least two pipe sections connected to each other in a sealing manner ( 2 . 3 ) existing well extension pipe ( 1 ) made of steel or plastic, characterized in that the outer lateral surfaces of the pipe sections ( 2 . 3 ) mechanically roughened by sandblasting or the like and / or with a mass consisting of sand and binders ( 5 ) are coated. Well expansion pipe according to claim 7, characterized in that the binder is an epoxy resin or epoxy resin mixture. Well expansion pipe according to one of claims 1 to 3 or 5 to 8, characterized in that the pipe sections ( 2 . 3 ) are connected to each other in the mutual connection area by a pull-resistant push-in socket connection.