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Von Roll Ag

Peter Hartmann Beteiligungen Ag

Peter Hartmann

Bernhard Bergmann

A tube with a tube wall composed of flexible material webs for covering pipe lines and for producing pipes and a unit for producing same. The tube wall is composed as a tube of two outer webs with longitudinal edges fused with one another and consisting of at least one tubular tension web made of glass fiber webs and mats lying in the interior of the outer covering. The longitudinal edges of the tension web are superimposed loosely to an overlapping, and the tension web is resin impregnated. The unit includes guide rollers, a core freely mounted on the guide rollers and made of core segments coupled with one another and having a width and an axis, clamping shafts projecting over the width of the core, reels mounted on the clamping shafts including material webs in a plurality of stations over and under the core, wherein the reels are offset with respect to the axis of the core and wherein the core extends through the plurality of stations and wherein the webs are guided around the guide rollers onto the core, and a cylinder downstream of the core being coupled to a front end of the core.

Unit for producing a tube with a tube wall composed of flexible material

The components forming the layers of a composite pipe are successively introduced into a rotary drum (1). Initially, a plastic reinforcing layer (8), including a fibre reinforcement, is introduced into the drum, the ends of the drum (1) being bounded by rings. A concrete core layer (16) is then introduced and the length of the core layer (16) is shortened relative to that of the drum (1) by shaping rings fixed to the drum ends. The shaping rings are then replaced by other shaping rings (20, 21) so that, on either side of the core layer (16), two annular spaces (22, 23) are formed which are filled by a socket material (24, 25) of the same composite as the reinforcing layer (8). Thus, at one pipe end a socket end (28) is formed and at the other pipe end a spigot end (30) is formed, each such end being located within the composite pipe wall thickness. After introducing a second reinforcing layer (26), the production of the composite pipe is completed. By producing the socket connecting elements (28, 30) simultaneously with the construction of the composite pipe, a reliable and rational production of the composite pipe with its socket connecting elements (28, 30) is achieved. By shaping a shoulder (33) on to the spigot end (30), when sliding together two composite pipes, the socket end (28) is centered. Simultaneously, an annular space (34) is formed, in which can be inserted an elastic seal (35) for drip-tight sealing.

Apparatus for producing a composite pipe in a rotating drum

The components forming the layers of a composite pipe are successively introduced into a rotary drum (1). Initially, a plastic reinforcing lyaer (8), including a fiber reinforcement, is introduced into the drum, the ends of the drum (1) being bounded by rings. A concrete core layer (16) is then introduced and the length of the core layer (16) is shortened relative to that of the drum (1) by shaping rings fixed to the drum ends. The shaping rings are then replaced by other shaping rings (20, 21) so that, on either side of the core layer (16), two annular spaces (22, 23) are formed which are filled by a socket material (24, 25) of the same composite as the reinforcing layer (8). Thus, at one pipe end a socket end (28) is formed and at the other pipe end a spigot end (30) is formed, each such end being located within the composite pipe wall thickness. After introducing a second reinforcing layer (26), the production of the composite pipe is completed. By producing the socket connecting elements (28, 30) simultaneously with the construction of the composite pipe, a reliable and rational production of the composite pipe with its socket connecting elements (28, 30) is achieved. By shaping a shoulder (33) on the spigot end (30), when sliding together two composite pipes, the socket end (28) is centered. Simultaneously, an annular space (34) is formed, in which can be inserted an elastic seal (35) for drip-tight sealing.

Method for producing a composite pipe in a rotating drum

The wall of the pipe section comprises a plurality of superimposed layers, which are formed from plastic and inorganic materials. The layer of inorganic materials forms the central layer, whose wall portions are in each case connected by a connecting layer to a reinforcing layer. While the central layer ensures the dimensional rigidity of the pipe section, the two reinforcing layers, which are made from a fiber-reinforced plastic, ensure the strength of the pipe. This combination of different layers is an inexpensive solution, which only requires that amount of expensive plastic as is required for the strength of the pipe. Through applying a plastic protective layer to the outer circumference of the pipe and a protective layer to the inner circumference of the pipe, the durability of the pipe section is ensured.

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Feldmeilen, Switzerland

Peter Hartmann