DD266483A3 - METHOD OF COMPLIANCE WITH A DEFINED INSTALLATION MINIMUM IN LAYING ASBEST CEMENT TUBES - Google Patents

Abstract

The invention relates to a socket joint for asbestos cement pipes, which are used primarily in water management civil engineering and melioration. A required minimum assembly gap can be guaranteed by using spacers between the pipe ends in a known pipe joint in which two pipe ends are connected in a sleeve and sealed by elastic sealing rings. These spacers are used in solid but Wasserloeslicher form.

Description

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Field of application of the invention

The invention relates to a socket joint for asbestos cement pipe, which are used primarily in water management civil engineering and melioration.

Characteristic of the known state of the art

The manufacture and use of asbestos cement pipes has been known in the art for many years.

A pipe joint was prepared as described in the DP PS 48486, such that two Rohrendon were plugged into a sleeve and sealed by elastic sealing rings to the outside.

When dioser solution was not considered that in asbestos cement pipe at Wasseraufnahmo due to the swelling capacity of the binder cement longitudinal expansion occurs.

Since there is no technology to guarantee a minimum mounting gap (corresponding to the length of the tubes) between the pipe ends in the sleeve, the pipe ends were many times pushed together during assembly.

When the pipeline was pressurized with water and the associated length expansion of the pipes, pipe breaks were unavoidable.

In order to counteract these pipe breaks due to the longitudinal expansion of the pipes, various solutions have been developed.

In DD PS 62 276 is described that in a conventional sleeve, a central groove was introduced and provided with a Abstands'ing. On Mondays wrid only one pipe end led to the Abstandsrinq and then the second pipe end. Due to the spacer ring exactly the minimum mounting gap should be maintained.

In practical operation, this solution proves to be unfit, as can not be fixed exactly when inserting the first pipe end of I.ago.

If the first pipe end is guided too far into the sleeve, the spacer ring can be sheared off or at least severely damaged.

If, on the other hand, it is not introduced far enough, the damage of the spacer ring occurs when the second pipe end is inserted

By shearing or damaging the elastic spacer ring, the minimum mounting gap can not be met.

The pipe ends may be too close. In the final consequence, pipe breaks with this solution are to be avoided.

Another possibility is aufjozoigt in DE AS 1675393.

A plastic sleeve of greater hardness, which is specially designed, is pulled over a pipe end and fitted with elastic Dichtrinpen inserted into a smooth sleeve.

This cuff with don elastic Dichtrinpen has the task to seal the tube in the sleeve to the outside and to maintain a certain distance from the second tube.

The second tube is only sealed with a sealing ring. This solution has several disadvantages.

First, the production of such a cuff is very complicated and costly, on the other montageunfreundiieh. Furthermore, the tightness to the outside is not guaranteed in every case.

Since all the solution variants described have disadvantages and practice it by a high rate of Rohrh. It must be stated that there is no practicable solution to avoid these bursts.

Object of the invention

The aim of the invention is to significantly reduce the costs and additional expenses incurred by pipe breaks in asbestos-cement pipe systems.

Explanation of the essence of the invention

The invention has for its object to provide a way that guarantees a safe installation of asbestos cement pipes and avoids pipe breaks infolye the longitudinal expansion of the pipes when exposed to water. Such a possibility can only be created if a defined Mcntagemindestspalt be ensured during assembly of the pipes.

Ettlndungsgemäß this object is achieved in that a pipe connection is made in bokannte way, inclom

two pipe ends are plugged together in a socket and these pipe ends are sealed by elastic sealing rings in the muff.

To comply with the defined Montagemlndestspaltes spacers are attached to the one pipe end. The second pipe end can be horangeschobon to the first end of the pipe to the stop. The spacers have the following properties. They are in Elnbaimistand in the solid state of aggregation. When the pipeline is exposed to water, it dissolves into its constituent parts and thus gives the volume of the expulsion

the Rohie free.

That is, materials that are used as distnz parts must be in solid, but water-soluble form. Eggs have proven to be suitable materials for microcrystalline cellulose. Ausfuhrungsbelopiel The invention will be explained in more detail below on an Ausführui.qobeispiel. Dabol shows the figure a section through a pipe connection with inserted spacers in the installed state. During assembly, the sleeve 3 is mounted with inserted elastic sealing rings 4 as usual on the laid pipe end 1. Dannch orfolyt the attachment (by adhesive), consisting of microcrystalline cellulose spacers 5 at the End face of pipe end 1. Now, the joining of the pipe joint takes place by the pipe end 2 in the

half-mounted sleeve 3 is inserted as far as the stop on the spacers.

The spacers 5 can be used, for example, in tablet form and on the circumference of a pipe end in certain Distance (example: 3 spacers arranged at an angle of 120 °). But it can also spacers are used both in a ring shape, which abut circular on the entire end face,

as well as in segmental form only cover certain ooreicho the frontal.

The strength of the spacers corresponds to the extent of the linear expansion of the AZ tubes. In the pressure test of the entire Systems, that is, when filling the pipeline with water, the spacers 5 dissolve and the pipes can not

at the same time, without causing any damage.

Claims (2)

1. socket joint for asbestos cement pipe, are arranged in the adherence to a defined assembly minimum gap between the two pipe ends to be connected spacers, characterized in that the spacers 5 consist of a solid, but water-soluble substance. 2. socket joint according to claim!, Characterized in that the spacers 5 consist of microcrystalline cellulose.