DE536157C - Process for the production of pipes and channels made of concrete or reinforced concrete - Google Patents

Description

Process for the production of pipes and ducts from concrete or reinforced concrete The invention relates to a method for producing pipes and ducts made of concrete or reinforced concrete.

In the previous methods, the pipes and channels are by means of certain To shape. (Core and shell) or by using the centrifugal process or by continuous winding of small amounts of concrete onto a core. These Processes have the disadvantage that they are relatively very cumbersome. Even z. B. the tamping of the concrete because of the narrow spaces between Core and mantle very difficult, although naturally also a certain uncertainty with regard to the concrete strengths achieved.

The situation is different in the method of the invention. here the concrete required for a certain pipe section is placed on a base simply spread out, properly tamped or pressed. That way .Highly compacted concrete is then z. B. rolled up on a core, with on it Care is taken to ensure that the concrete surrounding itself when it is rolled up into the existing, completely certain recesses find space, so that the density of the concrete even when rolled up Concrete. remains the same or is increased. The rolling up of the concrete can, however also be effected by the fact that either the with the base in suitable connection brought core rolled over the concrete layer at a certain distance or the Concrete layer is rolled up by turning the core. The technical progress the subject matter of the invention thus consists, inter alia. in that the raw material The required concrete is simply tamped or pressed onto a base and is rolled up in this state. This makes the previously usual difficult ones Avoid operations when tamping or throwing the concrete of the pipes.

The accompanying drawing shows two application examples of the subject of the invention.

Fig. Z to 3 show an application example in which in the stamped Concrete layer the above recesses are provided, while from Fig. Q. the core to be rolled over the concrete layer at a certain distance can be seen is.

The concrete a required to manufacture the pipe is placed on a flexible base b, e.g. B. fabric or rubber, spread evenly so that. the base area occupied by the concrete rz corresponds to the circumferential area of the finished pipe. After the concrete a is rammed or pressed on the base b , it is with the help of. Base b, which is attached to the core c with removable bolts e, for example, rolled up onto the tubular core c. So that the concrete after rolling up. remains firmly enclosed by the pad b, the pad is for example finally attached to the core with bolts f after the remaining free space of the concrete cross-section of the pipe has previously been filled with concrete at this closure point. . After the concrete has hardened for a certain period of time, the bolts e and f are removed so that the support b surrounding the pipe and the raw core can also be removed and the concrete pipe is ready for use.

In order to reduce the frictional resistance of the concrete when rolling up to reduce relocating concrete material, can when tamping or pressing the Concrete a suitable recesses d be executed (Fig. I and 2), or it will a clearance g is left between core c and the surface of the concrete layer a (Fig. 4), which is dimensioned in such a way that it is filled in by the surrounding concrete when it is rolled up will. This margin g can be achieved, for example, that the tubular core c runs at both ends on rails h which by a certain amount g over protrude the surface of the concrete layer a. Are the recesses mentioned d or margins g provided smaller than for the surrounding concrete material is necessary if the density remains the same, then, as mentioned above, the Density of the concrete, naturally rolling up with a correspondingly increased force must be done. Alyb.2 shows the half rolled up concrete layer a of Fig. I, while Fig. 3 shows the completely rolled-up concrete layer.

For the production of pipes with square, rectangular or Any shaped cross section is used instead of the above-mentioned round core c a core corresponding to the pipe cross-section is selected. In the same way you can at Place of closed, also partly open pipes, box-shaped channels, etc. can be produced, the concrete only needs to be rolled up as far as it is necessary to produce the channel cross-section.

When using reinforced concrete a z. B. one crosswise Iron reinforcement i and k according to Fig. 5, which the spreading base b with the laid iron in plan shows, inlaid. Appear in the finished concrete pipe iron i as ring reinforcement and iron k as longitudinal reinforcement. The iron i the Ring reinforcement can be selected so that it is around a specific one in the finished pipe Overlap dimension. In the overlapping parts of the iron z. B. an end the base corresponding recesses l so that the ends concerned the iron reinforcement is pressed into the rolled-up concrete through these recesses can be. A ring reinforcement can also be used as a finished Ring reinforcement is pushed over the core c before rolling the concrete and presses itself into the concrete when it is rolled up.

Claims (7)

PATENT CLAIMS: i. Process for the production of pipes and ducts made of concrete or reinforced concrete, characterized in that the for a specific pipe required concrete, with or without iron reinforcement on a flexible base is stamped or pressed, provided with recesses and then including its base on one will. 2. The method according to claim i, characterized in that in place the recesses mentioned in claim i between the stamped on the base or pressed concrete and the core a clearance is arranged when rolling of the concrete is filled by the displaced concrete material. 3. Procedure according to Claim i or 2, characterized in that the base at one end with the Core connected in a suitable way: is and the core about the one occupied by the concrete Surface is rolled away. 4. The method according to claim i or 2, characterized in that that the base is connected at one end to the core in a suitable manner and the concrete is rolled up by turning the core. 5. The method according to claim i or 2, characterized in that the two ends of the pad after rolling up connected to each other or attached to the core by means of bolts and the concrete can remain enclosed as long as necessary. 6. The method according to claim i or 2, characterized in that the flexible concrete base on one or both Ends recesses; so that the overlapping ends of the ring reinforcement can be pressed into the rolled-up concrete. 7. The method according to claim i or 2, characterized in that the ring reinforcement in finished iron rings when the concrete is rolled up, it is pushed over the core and when rolled up in presses the concrete into it.