DE1078509B - Prefabricated concrete molding, prestressed in transverse direction, for the formation of kink points in pressure pipelines - Google Patents

Description

The invention relates to a prefabricated, transversely prestressed concrete molding for the formation of kink points in pressure pipelines made of concrete, reinforced concrete or prestressed concrete pipes. A pressure pipe branch piece made of prestressed concrete for prestressed concrete pipes has already become known, in which on the prefabricated fitting a bias in the transverse direction by obliquely to the both axes of the branch pipes on the surface of which bandages are applied. With this well-known Execution of a prefabricated, transversely prestressed concrete molding is the Bandage-like transverse pre-tensioning by means of individual, spaced apart thick bands have been achieved, which are placed over both branching pipe parts together, with an additional belt in Direction of the plane of penetration of the colliding branch pipes perpendicular to the inclined ones Cross bandages is placed, which gives these a fixed position on the geometrically uneven surface of the branch piece. This known type of pre-stressing a concrete molding has become in practice not introduced to a large extent because of the technical effort required to produce this transverse prestressing too big and the manufacturing process is too cumbersome and expensive.

The invention is now based on the object of a concrete molding for the formation of kink points to create pressure pipelines made of concrete, reinforced concrete or prestressed concrete pipes in a simple way can be produced and provided with transverse prestressing reinforcement.

The task can be with a prefabricated, prestressed in the transverse direction concrete molding for the Formation of kinks in pressure pipelines made of concrete, reinforced concrete or prestressed concrete pipes solve according to the invention in that the pipe part forming the pipe kink point of a Jacket is enclosed with a cylindrical outer wall which is prestressed in a manner known per se.

The shaped concrete piece according to the invention has the advantage that it is simple and easy can be made without technical difficulties by, for example, one in the longitudinal direction according to the intended change of direction of the line curved or kinked formwork for the inner wall of the fitting eccentrically in a sufficiently wide cylindrical formwork for the Outer wall is introduced, with both formwork being vertical. By concreting the Reinforced space as required creates the straight fitting, which is also used in longitudinal as well as Prefabricated,

transversely prestressed

Concrete fitting for training

of kinks in pressure pipelines

Applicant:

Ed. Züblin Aktiengesellschaft,
Stuttgart-N _f Jägerstr. 22nd

Dipl.-Ing. Hans-Joachim Möller, Kehl,
has been named as the inventor

The co-inventor has requested not to be named

Transverse direction of changing wall thickness with its inner wall the intended change of direction the line causes.

According to a further feature of the invention, the inner formwork is arranged eccentrically in the outer, in such a way that the smallest wall thicknesses arising on the outside and inside of the curvature are approximately the same. Because with consideration for the Transverse prestressing reinforcement both straight pipes, elbows and the concrete fitting perpendicular to theirs end cylindrical outer wall, the concrete molding according to the invention is on the inner or Outside of the curvature in the direction of the line axis introduced different depths into the fitting. The shape of the transition from the concrete fitting to the connecting pipe is determined by the type of Determined pipe connection. The formwork can be used multiple times. But it's also special advantageous, the formwork of the inner wall in the middle part of the concrete molding from sections to train straight concrete or reinforced concrete pipes as permanent formwork. Furthermore, in the concrete molding a sheet metal jacket must be inserted, either of the shape of the curvature or of the simple cylindrical surface of the entire molding follows.

The main advantage of the rotationally symmetrical casing according to the invention of the actual Pipe bending point forming part of the pipeline consists in the fact that the concrete fitting is after usual method, i.e. by winding, how a pipe can be prestressed. The outside cylindrical fitting can namely in a common preload winding

90 »T67 / 141

machine clamped, laid or put on, whereby the transverse prestressing reinforcement just like can be wound up in the case of straight pipes.

In Fig. 1 and 2 of the drawing, an embodiment of a prestressed concrete molding is in Shown in the form of a prestressed bend;

Fig. 3 shows a longitudinal section through a concrete molding of another embodiment, the connection intended for pipes with a seam connection;

Fig. 4 is a longitudinal section of a concrete fitting for connecting pipes with bell socket connection, at which as in Fig. 1 straight pipe pieces are used as permanent formwork, the pipe ends of the Connection pipes are shown schematically;

Fig. 5 is a longitudinal section of a concrete fitting for pipes interconnected within the conduit be connected by sleeve sleeves.

The curved inner part 6, which can be provided with longitudinal and / or transverse reinforcement, is, according to the invention, surrounded by a concrete or reinforced concrete jacket 4 in which a slack reinforcement can be provided in the longitudinal and transverse directions. It is shown schematically in the drawing. The longitudinal reinforcement is designated with 4 a, the slack transverse reinforcement with 4 b . This casing 4 is designed to be cylindrical on its outer surface 5. The shaped piece thus has a cylindrical tube shape on the outside over its entire length, and the transverse prestressing wires 2 can thus be applied to the cylindrical outer surface 5 in a simple and known manner, namely by winding. This prestressed transverse reinforcement can then be protected again in a manner known per se by surrounding concrete 3 or the like.

In the jacket 4 surrounding the curved cavity, a longitudinal prestress in an can furthermore be applied be applied in a known manner. The longitudinal prestressing reinforcement is shown schematically in the drawing shown and provided with the reference numeral 2 α. This longitudinal prestressing reinforcement 2 a can either follow the surface lines of the outer cylinder 5 or the curvature of the cavity. In the latter case the frictional losses during prestressing in the longitudinal direction are then accepted.

It is also possible to insert a sheet metal jacket into the concrete molding. This sheet metal jacket can either follow the shape of the curvature or the simply cylindrical surface of the whole Fitting.

In FIGS. 3 to 5, 10 denotes the cylindrical which is suitable for the application of the transverse prestressing reinforcement Outer surface of the concrete molding, which corresponds to the surface of the outer cylinder 5 of FIGS. 1 and 2, Il the curved inner part causing the change in direction of the line (cf. 6 of FIG. 1 and 2), 12 the edge parts of the inner wall which correspond to the outer walls of the concrete molding engaging ends of the subsequent straight tubes 13 correspond. In FIG. 4, end pieces form 14 the curved inner part of straight concrete pipes with bell socket connections as permanent formwork.

The cylindrical outer shape of the concrete molding facilitates laying due to its handy shape and the alignment in particular of room bends. As long as the axis deviation, the Pipe diameter and the internal pressure in the pipeline and thus the thrust does not become too great, can the concrete molding after the prestressed reinforcement in the usual way through an overconcrete or the like. Is protected, if necessary, can also be laid in the trench without concreting.

Claims (6)

PATENT CLAIMS: 1. Prefabricated concrete molding, prestressed in the transverse direction, for the formation of kink points of pressure pipelines made of concrete, reinforced concrete or prestressed concrete pipes, characterized in that the pipe part (6, 11) forming the pipe kink point of a jacket (4) with cylindrical outer wall, which is known per se Way is biased, is enclosed. 2. Concrete molding according to claim 1, characterized in that the prestressed transverse reinforcement is protected in a manner known per se by a surrounding concrete casing (3). 3. Concrete molding according to 'claim 1 or 2, characterized in that in the concrete also nor a longitudinal bias (2 a) is applied in a known manner, either the Generating lines of the outer cylinder (5) or the curvature of the cavity follows. 4. Concrete molding according to one of claims 1 to 3, characterized in that in the concrete molding a sheet metal jacket is inserted, which either has the shape of the curvature or the simply cylindrical Surface of the entire fitting follows. 5. Concrete molding according to one of the preceding claims, characterized in that the inner formwork is arranged eccentrically in the outer one, in such a way that the and the smallest wall thicknesses arising on the inside are approximately the same. 6. Concrete molding according to claim 5, characterized in that the formwork of the inner Wall in the middle part made of sections of straight concrete pipes (14) as permanent formwork is formed. Considered publications:
Tölke, "Publications for Research into Pressure Surge Problems", Springer-Verlag, 1956, p. 26. 1 sheet of drawings © 909 T67 / T41 3.60