DE1285801B - Composite pipe to be laid in the ground - Google Patents

Description

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The invention relates to a large part of what is considered in the ground because of its elasticity Composite pipe, especially for Kanalisa- cover load on its surroundings, so that only one tion lines, consisting of an inner and a relatively small part of the overlap load from the pipe outer load-bearing plastic layer and one of these must be included. So it is suitable Layers at a radial distance and they 5 are particularly suitable for all those cases in which large connecting porous intermediate layer. Overlaps are necessary. The relatively small one

It is common for pipes to be laid in the ground, pipe weight makes handling easier and leaves no room ζ. B. for sewers, from concrete in the production in greater lengths. Manufacture centrifugal casting. These tubes, the drawing shows a part in cross section

whose diameter can be 1 m and more, io of a pipe according to the invention, are expensive to manufacture, have a large

weight and may therefore only be built in a relatively short tube bundle body with an outer supporting length getting produced; each longer pipe string layer 1, a filler layer 2, an inner load-dependent therefore many coupling points with a relative layer 3 and an inner protective layer 4. the complicated seals. In addition to the internal pressure 15, the two base layers 1 and 3 consist of reinforcement musts such pipes also the overlap load tem plastic; their strength is directed primarily to resist can and have a corresponding strength according to the time to be used. This puts a great deal of internal pressure on concrete pipes. Both layers are expediently 1 Rigidity of the tubular body and thus an ent and 3 made of the same material, e.g. B. from one Correspondingly large wall thickness and thus large ge ao glass fiber reinforced polyester. When dimensioning weight ahead. This is also felt to be a particular disadvantage of the outer base layer 1 To reduce the weight of the pipe, it is important to ensure that the pipe has the necessary indenting resistance known to receive such pipes to be laid in the ground speed. The between the two base layers 1 made of reinforced plastic. Plastic and 3 horizontal filling layer, which the two support tubes for larger overlapping loads, however, the layers must also have the necessary spacing from the new have relatively large wall thickness and the central zone is through a solid, not hydrosind consequently expensive and uneconomical. ψΜΙεη body formed, its modulus of elasticity

It is also known to produce so-called sandwich pipes, which are at least 200,000 kg / cm ² , and which are separated by a central filling layer. The intermediate layer is made up of round grains

have separate edge layers, the filler slag or from coke or from expanded happens mainly as an insulating layer provided burnt clay with an average grain diameter and made of appropriate material, e.g. B. fiber between a quarter and a sixth of the material or plastic foam. These intermediate layer thicknesses are formed, which are essentially connected to a solid body by means of known constructions. Pipe insulation and should heat losses during the outward journey. B. warm water is used through those that apart from relatively high elasticity (avoid E zwi-pipes. The strength and elasticity, see 50,000 and 100,000 kg / cm ² ) both adhere perfectly to the use of such pipes in deep installation the round grains 2 α is required, is only achieved with these known construc- tions on the adjacent base layers 1 and 3 if between or ₄₀ ensures. The total modulus of elasticity of the filling on the wall layers, in particular lattice-like layer 2, should be provided at least 200,000 kg / cm ^{2 of} arranged webs, but these are enough. Expediently, 1.2 manufacturing costs will increase in all three layers. and 3 the same plastic is used. The interior

The invention is based on the object, a protective layer 4 protects the pipe against both To create composite pipe, its wall thickness and 45 mechanical as well as chemical action material structure not only insulating properties against the medium to be conveyed through the pipe, or low weight and sufficiently large interior has been found to be particularly advantageous for production.

guarantee pressure resistance, but the above the pipe described the well-known centrifugal ?! also has such great elasticity that the method has been proven. The in the liquid state in a _{tube shape rotating one after the other in the case of sub-floor installation with a high load, so} that webs between or on the layer materials are left in layers should be avoided. harden, although it may be useful

To solve this problem, starting with the following layer, if a composite pipe of the type indicated at the beginning, the boundary layer of the layer produced proposed according to the invention that the intermediate 55 is not yet completely hardened. The new layer from round grains of slag, coke or material brought then partially penetrates into the expanded Fired clay with a middle standing layer, so that a perfect grain diameter between a quarter and a bunch of the adjacent layers is achieved. Sixth of the intermediate layer thickness is formed, the The pipe described is due to its structure

connected to one another by a plastic and are not rigid against external pressure, but rather limited in this so that the overall radially elastic. The overlap load acting at least at the top in underground pipes with the modulus of elasticity of the intermediate layer causes a ge-000 kg / cm ² . white elliptical deformation of the pipe cross-section.

In the case of the composite pipe according to the invention, the laterally deflecting pipes transmit the Inner and outer layer as the actual supporting parts are part of the in a manner known per se stratify, while the middle layer ensures that the overlap load on the laterally adjacent earth Base layers sufficient distance from the new rich. Destruction of the pipe even with large ones central axis received. Such a pipe transmits overlap loads is therefore hardly possible.

Claims (2)

Patent claims: 1. In the ground to be laid composite pipe, in particular for sewer lines, consisting of an inner and an outer load-bearing plastic layer and a porous intermediate layer holding these layers at a radial distance and connecting them, characterized in that the intermediate layer (2) of round grains (2a ) is formed from slag, coke or expanded baked clay with an average grain diameter between ¹ U and Ve of the intermediate layer thickness, which are interconnected by a plastic and distributed in this so that the total modulus of elasticity of the intermediate layer is at least 200,000 kg / cm ² . 2. Composite pipe according to claim 1, characterized in that the glass fiber reinforced, load-bearing Plastic layers (1, 3) and the plastic binder consist of polyester. 1 sheet of drawings