DE1072173B - - Google Patents

Description

GERMAN

The invention relates to a method and a device used for its implementation for the production of pipes or other hollow bodies from hard bitumen or other thermoplastic Binders and additives made from mineral or organic additives and on one after the other Process made pipe.

Such pipes are known per se. They serve, in particular, if they are kept porous, mainly for draining agricultural land or their subsurface irrigation. Up to now, these pipes have mostly been manufactured by pressing.

One has probably to isolate concrete pipes, which using a rotating mold and a spray tube axially displaceable in its interior for the concrete mix produced, proposed a bituminous intermediate layer thereby to bring in that by a jointly with the concrete spray pipe axially displaceable heatable additional Spray pipe the heated bitumen mass is applied to the concrete layer. Such a device However, it is not possible to use pipes made of hard bitumen or other thermoplastic binders to be generated with aggregates from mineral or organic substances.

But if you tried to make such pipes with the devices commonly used for the production of concrete pipes to generate, so it was found, even if you look at the known axially inside the pipe displaceable, the concrete mass distributing and spreading cores, insofar as difficulties when the hot mass from which the tube is formed immediately deforms again. That's why it was already tried to pour the hot mass around a core lined with paper and the form immediately after completion of the pour suddenly below the solidification point of the bitumen or the other To cool the binder.

In order to meet the difficulties and such pipes also with a large diameter easily and inexpensive to manufacture, the procedure according to the invention is such that the preheated, the binder and the mass containing the aggregates, optionally masses with different compositions of the binding agent and / or the aggregates, successively introduced into the hollow mold and by means of heatable cores, the temperatures of which are adapted to the properties of the respective mass introduced, against the inner wall of the cooled hollow mold or against the surface of the last one introduced Mass layer are pressed, with the selected temperatures of the cores below the dropping point temperature of the binder can be maintained.

Method and device

for the production of

or multilayer pipes

or other hollow bodies

and after the procedure

manufactured pipe

Applicant:

Dr. Gerold Bezzenberger,
Berlin-Charlottenburg, Hardenbergstr. 7th

To carry out this process, the following is a schematic illustration that is used Contraption. It should be noted that the method, which on the basis of a device is described with a vertical arrangement of the hollow form, without departing from the essence of the invention, too can be carried out in a horizontal arrangement of the hollow form. It shows

Fig. 1 is a vertical section through the device and

2 shows a horizontal section through a multilayer manufactured according to the method according to the invention Pipe.

A non-rotatable shaft 1 mounted on one or both ends is used to guide one in its Longitudinally displaceable and simultaneously rotatable cylinder 2. This cylinder 2 is cylindrical Core head 5 provided, the outer diameter of which corresponds to the inner diameter of the to be generated corresponds to tubular hollow body. The transition 3 from the cylindrical part 2 with a small diameter to the core head 5 with a large diameter is conical and with a helical shape extending grooves 4 provided.

When the entire device is arranged vertically, the construction illustrated in the drawing results.

The outside diameter of the core head 5 corresponds to the inside diameter of the hollow body to be produced 6, while the space between the core head 5 and the inner surface of the hollow mold 7 is the measure

909 690/372

for the wall thickness of the tubular hollow body 6 results.

The conical transition 3 between the cylinder 2 with the small diameter and the core head 5 and the latter can be heated. With thermostats, the temperature of these parts can be reduced to the The softening temperature of the respective processed binding agent of the molding compound is regulated and constant being held.

To avoid the collapse or harmful deformation of the hot mass introduced into the hollow mold, The hollow shape 7 is to be avoided during the manufacturing process from which the hollow body is produced surrounded with the inclusion of a space with a jacket 8 and this space is used for Recording of a coolant, e.g. B. water, cold air or the like, whereby the hollow shape is cooled down so far can be that the coming against the inner surface of the hollow mold to the plant filling compound immediately below their softening point is cooled, so that a subsequent harmful deformation despite the application new hot masses on the inner surface of the cooled mass, which is adjacent to the mold can be done.

The above-described vertical arrangement of the hollow shape has compared to a horizontal one Arrangement has the advantage of easier introduction of the filling compound. This is described in the Arrangement from above into the space between the inner surface of the hollow mold 7 and the rotating and at the same time axially displacing cylinder 2 introduced with the small Durohmesser. It falls down by gravity alone until it hits the conical transition 3 between the cylinder 2 and core head 5 comes to rest. The circumferential worm flights 4 of the transition part 3 now cause the mass to spread, which then passes through the core head 5 on the cylinder 2 against the inner wall the hollow mold 7 is pressed evenly where it is due to the cooling of the hollow mold inner surface is immediately cooled below the solidification point of the mass.

Instead of a cooling jacket surrounding the hollow shape, the solidification of the outer surface of the to be produced hollow body can also be achieved that the mold 7 through pores or small openings is made water-permeable and the cooling water through these pores into the porous, yet hot manufacturing compound is pressed in during the manufacturing process.

With successive use of cylinder heads 5 with different diameters can Manufacture pipes whose walls are made up of different layers. The porosity of these layers can, for example, be different when using aggregates with different grain sizes being held. For example, the 6 cm thick wall can be used in the manufacture of a porous Pipe must be designed so that an outer layer 2 cm thick underneath. Use of fine-grain aggregate material, z. B. fine sand, is kept slightly porous, whereupon a second layer, also of 2 cm thick, using a coarser surcharge, such as B. gravel, is formed, creating this layer Its structure is more coarsely porous, while a third layer is needed for its production coarser aggregate material can be used, thereby making it even more permeable.

The possibility of being able to produce layers with different porosities is of particular importance for the production of well filter tubes. If pipes made of bronze, brass, earthenware or the like are used in the well construction for the well filter, then gravel filter layers with different grain sizes of gravel must be introduced around such well filter tubes, which have the task of facilitating the flow of water to the well and on the other hand, hold back the fine sands, which would otherwise lead to the well being silted up quickly. The use of such filter layers surrounding the well pipes, however, makes a bore with a large diameter necessary. For this reason, it makes well construction considerably more expensive. If, however, well filter pipes are used, which according to the new process, as described above and shown schematically in Fig. 2, consist of a binder and aggregates of different grain sizes in the individual layers, where in Fig. 2 with I the layer with the fine grain rnun g of the aggregate, w ith 11 the ski c ht of Dimension ren T Cörnung de s supplement it might be and indicated with llldie Schichtj xiit ~ 3eir_gr- Qbsten grain size of the aggregate, as a result of the outside-in increasing porosity of the applied layers to a certain extent replace the task of the gravel filter in well construction, then there is a considerable reduction in the price of well construction. In addition, the durability and thus the service life of the well is significantly increased because the well filter pipes made of a hard bitumen-mineral mixture are not affected by the aggressive substances in the water, e.g. B. free carbon dioxide are attacked. It is also of great importance that hard bitumen is completely free of tar and phenol, so that it does not have a harmful effect on the taste of the water.

Claims (7)

Patent claims: 1. Process for the production of single or multilayer pipes or other hollow bodies Hard bitumen or other thermoplastic binders and mineral or organic additives Aggregates characterized by pressing in a mold that contains a core, that the preheated mass, possibly masses with different compositions of the binding agent and / or the aggregates, successively introduced into the cavity shape and by means of heatable cores, the temperatures of which correspond to the properties of the particular mass introduced are adapted against the inner wall of the cooled hollow mold or against the surface of the the last applied layer of mass are pressed on. 2. Apparatus for performing the method according to claim 1, characterized in that the Core designed as a rotatable, vertically displaceable and heatable press core (2 to 5) and the Form (7) is surrounded by a cooling jacket (8). 3. Device according to claim 2 for the production of multilayer hollow bodies, characterized in that that the hollow mold (7) several, successively in the hollow mold (7) can be introduced, in the axial direction the hollow mold (7) longitudinally movable and rotatable about this axis cores each with one to the dimension of the layer to be pressed in diameter is assigned to the core head (5) with a reduced diameter. 4. Apparatus according to claim 3, characterized in that the transition (3) to the core head (5) cone-shaped and with screw ¹ gear (4) is provided. 5. Device according to claims 3 and 4, characterized in that the transition (3) to the core head (5) and this is controllably heatable. 6. Device according to claims 2 to 5, characterized in that the hollow shape (7) is porous. 7. According to the method according to claim 1 and with the device according to one of claims 2 up to 6 multilayer pipe manufactured thereby characterized in that the aggregates of the individual pipe layers are coarse-grained towards the inside of the pipe are. Considered publications: German Patent Specifications No. 927 977, 882 667, 527, 623 264, 438 961, 430726; German utility model No. 1734 579; British Patent No. 431,413. 1 sheet of drawings © 909 690/372 12.