DE20305353U1 - Well delivery pipe comprises at least two pipe segments whose outer surfaces are roughened by sand blasting or a similar process and/or are coated with a compound consisting of sand and bonding agents - Google Patents

Abstract

The well delivery pipe comprises at least two pipe segments whose outer surfaces are roughened by sand blasting or a similar mechanical process and/or are coated with a compound consisting of sand and bonding agents.

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 area between the outer jacket of a well expansion pipe and the hole in the ground is drilled after inserting the Well expansion pipe in its intended position by known Verfüllmassen filled out and somewhat sealed.

So far it is assumed that so-called pathways between the pipe jacket and the filling compound could form through which in the end it becomes undesirably less clean Seek groundwater into the ground area of the borehole could.

The present invention lies the task underlying a well expansion pipe of the generic type to show which is absolutely sealed with a filling compound Can enter into a connection.

This object is achieved according to the invention solved, that the outer surface of the pipe sections mechanically roughened by sandblasting or the like and / or coated with a mass consisting of sand and binders are.

Through these measures, an enlarged and fissured Outer surface achieved, which is an excellent basis for the connection with filling compounds offers. The backfill can intensely with the roughened outer surface of the well pipe connect and thus a very effective seal between the outer surface of the well pipe and the backfill cause.

If one made of sand and binders existing mass is used to coat the pipe sections, it is advantageous if the binder epoxy resin or epoxy resin mixture is. Such a mixture can be factory-adjusted to the corresponding Pipe sections applied and after curing the binder one enter into a highly effective, tight connection with the pipe sections.

For intrusion or infiltration to prevent groundwater from entering a well pipe, is provided according to a concept of the invention that the pipe sections among themselves through water-swellable Sealing rings, sealing tapes or a water swellable Sealant are sealed against each other.

By using such sealants an absolutely secure seal in a particularly simple manner the connection areas achieved because the sealing effect on contact with water through the swellability the sealant is enlarged.

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 exemplary 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 Ver filling materials in the said annular gap, the aim being to fill these filling materials as tightly 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 , since the outer jacket surface is considerably enlarged and largely jagged compared to a smooth pipe by the measures described, so that there is an intimate bond between this roughened outer jacket surface and a corresponding filling compound.

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 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 1, characterized in that the binder is an epoxy resin or epoxy resin mixture. Well expansion pipe according to claim 1 or 2, characterized in that the pipe sections ( 2 . 3 ) with each other through water-swellable sealing rings ( 6 ), Sealing tapes or a water-swellable sealing compound ( 10 ) are sealed against each other. Well expansion pipe according to claim 3, characterized in that the sealing rings ( 6 ) or the sealing tapes are made of polychloroprene. Well expansion pipe according to claim 3, characterized in that the sealing compound ( 10 ) consists of polyurethane. Well extension pipe according to one of the previous ones existing claims, characterized in that the pipe sections ( 2 . 3 ) in the mutual connection area with threads ( 9 ) are provided and screwed together. Well expansion pipe according to claim 3 or 4, 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 one of claims 1 to 5, characterized in that the pipe sections ( 2 . 3 ) are connected to each other in the mutual connection area by a pull-resistant push-in joint. Well expansion pipe according to claim 3 or 4, 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.