DE102005045050A1 - Adapter for pulling pipes through underground excavations has sleeve which fits over pipe and is held in place by plug which is spread by conical section on end of tube, to which pulling cable is attached - Google Patents

Abstract

The adapter for pulling pipes through underground excavations has a sleeve (11) which fits over the end of the pipe (6). The adapter is held in place by a plug (10) which is spread by a conical section (8) on the end of a tube (7), to which the pulling cable is attached. The tube supplies air to an inflatable sealing cushion (3).

Description

The The invention relates to a device for use in feeding of pipelines in boreholes.

At the Trenchless laying of pipelines becomes horizontal pilot holes created in the belated by means of a tension element, for example a rope, a chain or a linkage in Connection with a usually positioned outside the pilot hole Draw a new pipe is retracted.

in this connection come often so-called pipe inlet adapter for use, which serve the tension element to connect with the new pipe to be recovered. Usually based the connection between the new piping and the pipe inlet adapter on adhesion.

Especially for new piping designed for a drinking water supply are provided take over the pipe inlet adapter often additionally a sealing function. They should do this in the direction of movement Close the front open end of the pipeline so that there is no ingress of dirt and liquid effectively prevented. For this purpose, from the prior art Series of pipe entry adapters known that the sealing function different constructive possibilities realize.

at the structurally simplest option a section of the pipe entry adapter located inside the pipe located, equipped with a classic O-ring, which seals the gap seals between pipe inlet adapter and inner wall of the pipe. However, such a sealing pipe intake adapter have the problem on that o-rings, to achieve a sufficient sealing effect in the radial direction must be upset. Consequently, it is already in the insertion of such with an O-ring provided pipe inlet adapter in the opening of the pipes necessary to deform the O-ring. Furthermore, the fits must be between the pipe inlet adapter, the O-ring and the inner wall of the pipes be performed in sufficiently close tolerances to the desired sealing effect to achieve. Furthermore, it is necessary for every nominal diameter of Pipes a corresponding pipe inlet adapter ready hold.

Of these, starting from pipe inlet adapters have been developed, where the possibility exists, the outside diameter the sealing ring subsequently, d. H. after insertion of the adapter into the pipeline. These systems show significant advantages in terms of handling the adapter. Farther are no special requirements with regard to the tolerances required. Also, it is hereby possible by an appropriate Design more than one nominal pipe diameter in one, albeit small, diameter range cover. Nevertheless, show Also, these improved tube retraction adapters have no compatibility with one Variety of pipe diameters. Furthermore, such adapters often designed to be structurally complex, a subsequent one Outside diameter magnification of the To allow sealing ring.

Of the The invention is therefore based on the object, a further developed Piping adapter to provide, at least in terms a disadvantage of the prior art is improved.

These The object is achieved by the subject matter of the independent claims. advantageous embodiments are the subject of the dependent claims.

Of the The core of the invention provides a device for drawing in pipelines in Erdbohrungen before, at the adapter element, over which the device with the pipeline can be connected and with a variable in its cross-sectional dimensions (expandable) sealing pad - preferably tensile and / or shear-resistant - coupled becomes.

Under In particular, all pipelines are cross-sectionally independent hollow long body understood. These should not be limited in terms of material selection. Preferably, however, plastic, metal or ductile iron pipes are used.

Under Erdbohrungen should additionally for drilling in the ground also all elongated openings in material accumulations, for example, bulk material wells be understood. There is also the possibility of repair lines (so-called Liner) with the device according to the invention in existing pipelines, underground or above ground be relocated, to collect for repair. In this case, the old lines Erdbohrungen in the context of the invention.

According to the invention, sealing cushions are understood in particular to mean an element which defines an essentially closed inner volume and in which at least one outer dimension, but in particular the cross-sectional dimensions, can be changed by filling the inner volume. The cross section of the sealing pad is oriented Preferably at the cross section of the pipe to be sealed, but may also deviate from this. It is therefore preferably round or oval.

The use according to the invention a sealing pad to achieve the sealing of the pipes across from the environment allows a simple installation of the pipe insertion adapter, as for the seal required pressing of the sealing element with the pipe inner wall only subsequently through the inflation of the sealing pad is achieved. By the preferred tensile and / or shear-resistant, d. H. in particular mechanical connection the sealing pad to the adapter element, it is possible the entire device to be inserted in the pipes in a single step. Also, by the mechanical coupling of the sealing pad to the Adapter element slipping of the sealing pad in the pipeline and consequently a difficult disassembly can be avoided.

Preferably the adapter element has a tension and / or pressure-actuated spreading device at least partially located within the piping. The tensile and / or pressure-actuated Spreizvorrichtungen can be based on a via the tension element (rope, chain, Drawbar) on the adapter element exerted longitudinal force deflect radially to one or more spreading against the Press inner pipe wall. Such automatic Spreading devices are characterized by easy installation as well by their self-reinforcement on, because rising tensile forces to a reinforced Clamp the adapter element inside the pipeline.

Next this self-acting, on a device applied to the device tensile or compressive force based device can Any adapter elements come for use that a force and / or positive Allow connection between the device and the pipeline.

In an advantageous embodiment the spreading device on a pull rod, which in at least a section has a conical lateral surface, wherein the drawbar by a tensile and / or compressive force induced relative movement to a or more spreading causes this / their radial deflection.

Farther has the device according to the invention Preferably, an adapter element with an adapter head, the closes in the direction of movement front end of the pipeline. This Adapter head can have any shape. Preferably However, he performed conical, wherein its diameter tapers in the direction of movement. A such shape of the adapter head can effectively prevent the device from getting caught to prevent a resistance within the earth hole.

In an advantageous embodiment the adapter head has a longitudinal axial Hole on, in which the drawbar of the adapter element movable guided is, with the conical section of the drawbar on the side the adapter head is attached to the internal volume of the piping adjoins and the drawbar still on the other side of the adapter head a connecting element for connection to a pulling / pushing element, d. H. For example, a rope, a chain or a pull / push rod has. Furthermore, the spreading elements are preferably on the adapter head hinged.

A such embodiment allows the adapter element a structurally simple and robust design of an adapter element with spreading device.

at an advantageous embodiment can the drawbar hollow executed be. This can thus be used to add a fluid to the sealing pad to or from this dissipate. Consequently, the mechanical connection between the sealing pad and the adapter element according to the invention used here for the supply of the fluid.

There the pull rod preferably through the adapter element in the Environment, it is possible in a simple way a change of the Sealing cushion (volume or cross-sectional enlargement) also in the mounted To achieve state of the device.

Preferably the drawbar still has a valve to open on demand or close of the cavity of the drawbar. With the valve, the pressure within the sealing pad and consequently its outer dimensions changed and fixed become. Alternatively, the valve may also be a component of the sealing pad be yourself. Advantageously, however, the valve is in a section arranged the pull rod, which is also in the assembled state of the device easily accessible is.

In a further advantageous embodiment of the device according to the invention is the mechanical connection between the adapter element and the Sealing bag detachable executed. This makes it possible in a simple manner, any embodiments of sealing bags with any embodiments from adapter elements to connect. Also, this allows for a quick and easy replacement of defective components.

In order to achieve a simple, secure and releasable connection between the sealing pad and the adapter element, preferably screw and / or bayonet locks can be used become. However, any other types of couplings are possible.

The Device according to the invention is also suitable for the sealing of a liquid introduced into the pipeline (so-called flooding of the pipeline).

The Invention is described below with reference to an illustrated in the drawings embodiment explained in more detail.

In the drawings shows:

1 a device according to the invention in the assembled state in a longitudinal section and

2 : an enlarged section of the 1 ,

The device according to the invention, referred to below as tube retraction adapter, has an adapter element 1 partly, namely with a spreading device belonging to the adapter element 2 within the pipeline to be recovered 6 located. The expansion device of the adapter element is followed by a sealing cushion arranged completely inside the pipeline 3 that's about a mechanical clutch 4 with the adapter element 1 connected is.

The adapter element 1 has an adapter head 5 on, the front in the direction of movement opening of the pipeline 6 completely closes.

In a centric bore of the adapter head 5 is a pull rod 7 movably guided, which at their rear, ie within the pipeline 6 located at the end of a section 8th having a conical lateral surface.

At the opposite end of the drawbar 7 is an eyelet 9 for fastening a tension element (not shown), for example a rope, a chain or a linkage provided.

On the adapter head 1 are still a total of four spreading elements 10 arranged over a contact surface in direct contact with the conical section 8th of the drawbar 7 stand.

Will the drawbar 7 in the direction of movement (ie in the drawing to the right) loaded with a tensile force, this leads to a relative movement of the drawbar 7 within the bore of the adapter head 5 and consequently also to a relative movement of the conical section 8th to the spreading elements 10 causing them to deflect radially and against the inner wall of the pipeline 6 be pressed. To make a firm connection of the adapter element 1 with the pipeline 6 to achieve, have the spreading elements 10 at the one with the pipeline 6 in contact section on teeth.

The spreading elements 10 For example, via joints (not shown) with the adapter head 5 be connected. Alternatively, the radial deflection of the spreading elements 10 be achieved by a corresponding elasticity of their material. This has the advantage that the elastic restoring forces of the radially deflected spreading elements 10 to a provision of the sliding drawbar 7 lead to the starting position. Thereby, the disassembly of the device can be simplified.

The adapter head 5 still has a centering sleeve 11 on, by which the adapter head 5 and the pipeline 6 be positioned exactly to each other. This additionally prevents the ingress of dirt and liquid into the interior of the pipe.

A complete seal of the interior of the pipeline 6 is through the sealing bag 3 achieved. This sealing pillow 3 is a detachable, in the closed state tensile and shear-resistant coupling 4 with the drawbar 7 of the adapter element 1 connected. Both the clutch 4 as well as the drawbar 7 have a longitudinal bore, which serve the sealing pad 3 from the outside over the drawbar 7 with a pressure medium, for example, to fill air.

To regulate the pressure inside the sealing bag 3 is a valve at the front end of the drawbar 12 arranged. During operation, this valve can be replaced by a protective cap 13 be protected from the ingress of liquid and dirt.

The sealing bag 3 is executed in the illustrated embodiment in the form of a cylinder. This shape allows a large sealing surface between sealing pads 3 and tube inner wall can be achieved. In principle, any shapes for the sealing pad are possible because the preferred use of a highly elastic material for the wall of the sealing pad, this adapts itself to the cross-section of the pipe. In particular, spherical or space elliptical sealing bags can also be used.

Claims (11)

Device for drawing a pipeline into a borehole with an adapter element ( 1 ), which is a tensile and / or shear-resistant connection of the device with the pipeline ( 6 ) and ei in its cross-sectional dimensions changeable sealing pads ( 3 ) connected to the adapter element ( 1 ) connected is. Device according to claim 1, characterized in that the adapter element ( 1 ) a tension and / or pressure-actuated spreading device ( 2 ), at least partially within the pipeline ( 6 ) is located. Device according to claim 2, characterized by a pull rod ( 7 ) contained in at least one section ( 8th ) has a conical lateral surface, the one by a tensile and / or compressive force induced relative movement one or more adjacent spreading elements ( 10 ) deflects radially. Device according to one of the preceding claims, characterized by an adapter head ( 5 ) of the adapter element ( 1 ), which is the forward end of the pipeline ( 6 ) closes. Device according to claims 3 and 4, characterized in that the adapter head ( 5 ) has a longitudinal axial bore in which the pull rod ( 7 ) is movably guided, the section ( 8th ) of the drawbar ( 7 ) with the conical surface on the side of the adapter head ( 5 ), which is adjacent to the inner volume of the pipeline and the drawbar ( 7 ) on the other side of the adapter head ( 5 ) has a connecting element for connection to a pull / push element. Device according to claims 3 and 4, characterized in that the spreading element or elements ( 10 ) on the adapter head ( 5 ) are articulated. Device according to one of claims 3 to 6, characterized in that the drawbar ( 7 ) is executed hollow and a supply of a liquid and / or gaseous medium to the sealing pad ( 3 ). Device according to claim 7, characterized in that the drawbar ( 7 ) a valve ( 12 ) for opening or closing the cavity of the drawbar as required ( 7 ) having. Device according to claim 7 or 8, characterized in that the connection between the drawbar ( 7 ) and the sealing pad ( 3 ) is carried out releasably. Device according to claim 9, characterized by a connection between the drawbar ( 7 ) and the sealing pad ( 3 ), which is designed as a screw and / or bayonet closure. Method of drawing a pipeline into a pipeline Erdbohrung, with one with a tensile or thrust loaded adapter is connected to the pipeline, characterized in that during insertion of the Adapters connected to the adapter, expandable sealing bag is inserted into the tube.