DE102016006251A1 - Method and device for crushing and removing underground pipelines - Google Patents

Abstract

The invention relates to a method for crushing and removing underground laid pipes of asbestos cement in open design, which comes with a nominal size of greater than DN 500 used and an apparatus for performing the method. The object of the invention is to provide a method for crushing and removal of underground pipelines with a nominal diameter greater than DN 500 asbestos cement in open design and an apparatus for performing the method, which ensures environmentally sound and health-friendly removal and disposal of the pipeline parts , According to the invention the object is achieved in that at the pitch of the pipeline water or other means at the location of the separation process is finely applied to the pipe inner wall and the forming parting line. On a cutting tool, consisting of two or more cutting rails (1), cutting rollers (2), cutting blade (4) or hook knife (5) are arranged and on the cutting tool, a spray device consisting of manifolds (7) and nozzles (8) for generating the water curtain or for dosing another means for binding asbestos fibers installed.

Description

The invention relates to a method for crushing and removing underground laid pipes of asbestos cement in open design, which comes with a nominal size of greater than DN 500 used and an apparatus for performing the method.

The known approved procedures with low exposure to asbestos fibers are according to the technical rules for hazardous substances (TRGS 519 - asbestos, demolition, refurbishment or maintenance work) suitable for pipe diameters up to DN 500. These are on the one hand the press-pull method and on the other hand, the auxiliary pipe method.

In the DE 103 23 626 A1 For example, a device for crushing a tube of brittle-refracting material which is drawn into a subsurface pit accessible from the ground therefrom and having a pulling member engaged with a tension member is provided.

In this trenchless process, the pipe is pulled into a target pit or intermediate pit and crushed there. The method is suitable for nominal widths up to DN 500 and has the approval of the trade association as a low-exposure method for removing asbestos-cement pipelines.

In the also known auxiliary tube method according to EP 1 088 961 B1 the pipe is pushed by means of an auxiliary pipe into a pit and taken there in pieces with whole pipe lengths.

This trenchless method is only suitable for pipelines with a nominal diameter up to DN 500 and also has the approval of the trade association as a low-exposure method for the removal of asbestos pipes.

The tubes are split as whole pieces or by means of special slow running saws into pieces of shorter length and disposed of in suitable special waste dumps.

These methods are used as press-pull method according to the German Association of the Gas and Water (DVGW) -Werksblatt GW 322-1; Trenchless replacement of gas and water pipelines, part 1 or auxiliary pipe process according to DVGW worksheet GW 322-2 Trenchless replacement of gas and water pipelines, part 2, described and in one Article in the annual journal Fachgemeinschaft Guss-Rohrsysteme, European Association for Ductile Iron Pipe Systems (FGR / EADIPS) 45, 2011, pages 43 ff , released. A pipeline of asbestos cement DN 250 was trenchless replaced against a ductile cast iron DN 200. Due to the low strength of the old pipeline, a smaller diameter plastic pipe as a guide for the Zuggestänge was centrally drawn into the old pipe and the space between the plastic pipe and the old pipe with a special mortar filled, which takes over the function of stabilizing the old pipe after curing. The old pipe was crushed in the target pit under a water veil, the broken pieces collected in a dense sack and disposed of.

In the report press-pull method with soil removal in the Journal-line construction; well construction; Geothermal energy in the annual magazine 12/2011 (bbr, page 24 ff) a variant of the press-pull method is described in which it is possible by the use of a device for soil removal by means of auger, to replace the old pipe with a larger diameter pipe.

Both methods have the goal of pipe replacement, in which simultaneously with the removal of the old pipe or immediately thereafter a new media pipe is drawn into the now free route.

Also known is the so-called burst lining as a trenchless process. Here, pipes made of brittle material, such as gray cast iron, asbestos cement or stoneware, are broken and the pieces are pushed into the surrounding soil. In the existing route, expanded by a Aufweitkörper, a new tube is fed. The burst lining is described in the leaflets of the German Association for Water, Wastewater and Waste e. V. (DWA) M143-15 and DVGW GW 323.

The patent DE 10 2009 021 389 B4 describes a method that allows a kind of modified burst lining for ductile pipe materials such as steel or polyethylene. Here, the old pipes are longitudinally cut by means of a body with cutting wheels, expanded with an expander and pressed into the surrounding soil. At the same time a new pipe is drawn into the expanded old pipe.

Both methods are trenchless procedures for laying a pipeline in an existing route, wherein the old pipe is destroyed and pressed into the surrounding soil.

The disadvantage is that the known methods are not used in pipes made of asbestos cement with a nominal size greater than DN 500.

The known methods for replacing pipes made of asbestos cement are only up to a nominal diameter DN 500 as a method with low exposure to asbestos, or so time-consuming and cumbersome that they are ineligible. These are equipped with a slow running saw. Thus, the pipes removed as a whole have to be transported with a lot of space or be cut open in a time-consuming manner.

The object of the invention is to provide a method for crushing and removal of underground pipelines with a nominal diameter greater than DN 500 asbestos cement in open design and an apparatus for performing the method, which ensures environmentally sound and health-friendly removal and disposal of the pipeline parts ,

According to the invention the object is achieved in that the pipes are divided into half-shells or into several pieces by a cutting tool. Subsequently, the pipe sections are exposed and disposed of properly.

On the cutting tool is installed a spraying device consisting of distribution pipes and nozzles for producing a drop of water or other means. This binds the asbestos fibers.

On the cutting tool, two or more cutting rails, which are provided with cutting rollers or hook knives arranged.

As another agent, for example, an aqueous solution of surfactants is used. In the division of the asbestos-cement pipeline, water or another agent, for example an aqueous solution of surfactants, is finely dispersed on the pipe inner wall and the forming parting line at the point of the separation process.

After exposure, the parts of the asbestos-cement pipeline are retrieved in whole pieces. These are stored in a lockable and foil-lined container and disposed of in a special landfill.

Advantages of the method and the associated device according to the invention are that parts of pipes made of asbestos cement with a nominal diameter of more than DN 500 are removed and disposed of. Thus, the volume resulting from wall thickness, perimeter and length is substantially minimized.

Furthermore, the separation of the asbestos cement pipe prior to removal in open design prevents the release of asbestos fibers.

A further advantage of the method according to the invention is that less volume is required on the vehicles during transport of the asbestos cement pipe parts, and thus a smaller number of transports has to be carried out. Even when moving to the hazardous waste landfill, less volume is needed and fewer voids are created at the landfill.

The invention will be explained in more detail below with reference to five drawings.

The 1 shows the device according to the invention in longitudinal section with the cutting tools.

The 2 shows the device according to the invention in longitudinal section with a cutting rail, which is equipped with a continuous cutting blade.

The 3 represents the device according to the invention for a pipe diameter and is equipped with a hook knife.

The 4 shows a fully exposed pipe during the cutting process.

In 5 the cutting process is shown in still covered with the soil pipe.

After the construction of the excavations at the ends of the section of the pipeline to be replaced having a nominal diameter greater than DN 500, the opening of the pipeline takes place in a length which is required for the respective units, by means of a slow-running saw.

In an opening, the device according to the invention is introduced into the pipeline and the cutting rails 1 with the cutting rollers 2 be by means of a suitable hydraulic cylinder 3 or a mechanical adjustment that matches the diameter of the tube.

Another embodiment of the device according to the invention is that the cutting rails 1 instead of using cutting rollers 2 with a cutting knife 4 or with a hook knife 5 are equipped.

The cutting rails 1 have adjustable support wheels 6 , which ensures a centric guidance.

The device according to the invention is pulled or pressed through the pipeline by means of a tractor or press machine. The pipeline is divided into two half-shells or several shells.

The tensile force is transmitted by means of a divisible ladder linkage or a rope or more cables from the tractor to the device. When using a pressing machine, the pressing force is transmitted by means of a pressure linkage to the device according to the invention.

In the level of separation, by means of a water-fog or other suitable means, such as an aqueous solution of asbestos-binding surfactants, the release of asbestos-cement is avoided, in which the water or other agent is selectively removed at the point of separation by means of suitable distributors, consisting of distribution pipes 7 that with nozzles 8th are fitted finely dispersed on the pipe inner wall and the forming parting line is applied.

Subsequently, the parts are exposed, removed by means of suitable lifting device and loaded into the film-lined container. It is disposed of on a hazardous waste landfill.

LIST OF REFERENCE NUMBERS

1

cutting rails

2

cutting rollers

3

hydraulic cylinders

4

cutting blade

5

hook knife

6

training wheels

7

manifold

8th

jet

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10323626 A1 [0003]
• EP 1088961 B1 [0005]
• DE 102009021389 B4 [0012]

Cited non-patent literature

• Article in the annual journal Fachgemeinschaft Guss-Rohrsysteme, European Association for Ductile Iron Pipe Systems (FGR / EADIPS) 45, 2011, pages 43 et seq. [0008]
• Journal-line construction; well construction; Geothermal energy in the annual magazine 12/2011 (bbr, page 24 ff) [0009]

Claims (5)

Method for crushing and removing underground pipelines with a nominal diameter greater than DN 500 made of asbestos cement, in which by means of a cutting tool the pipelines are divided into two half-shells or several pieces, characterized in that water or another means is used in the division of the pipe at the point of the separation process finely dispersed on the pipe inner wall and the forming parting line is applied. A method according to claim 1, characterized in that an aqueous solution of surfactants is used as a further means for charging and binding of asbestos fibers. A method according to claims 1 and 2, characterized in that the parts of the pipeline are recovered after exposure in whole parts and stored in a sealable container equipped with foil and disposed of. Device for carrying out the method according to claim 1, characterized in that on a cutting tool consisting of two or more cutting rails ( 1 ), Cutting rollers ( 2 ), Cutting blades ( 4 ) or hook knife ( 5 ) are arranged. Device according to claim 4, characterized in that on the cutting tool a spraying device consisting of distributor pipes ( 7 ) and nozzles ( 8th ) for producing the water curtain or for dosing another means for binding asbestos fibers.

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