DE1800923A1 - Tensile and shear-proof screw socket connection - Google Patents

Description

Tensile and shear-proof screw socket connection Description.

With the screw socket connection, the pipe socket is in a sealing chamber and pipe ends together, a sealing ring is pressed by means of the screw ring in such a way that that thereby the seal takes place. Occurring tensile or shear forces can only are transferred to the extent that they are smaller than the frictional forces that arise result in the sleeves by pressing the sealing ring. These forces are relative small. The lines with this connection therefore require both for testing as well as for operation at the ends and abutments on the elbows. The production Such an abutment is time consuming and can often be due to the local conditions not be carried out. For these reasons, efforts are made to use the screw socket connection to make tensile and shear resistant.

In the case of an already known high-tensile screw socket connection by means of a slotted retaining ring, which is in an incorporated groove at the spigot end of the pipe engages, the tensile force is transmitted via the screw ring. With this device This means that only pipes can be installed with a groove milled into the spigot end. Apart from the unfavorable notch effect of the groove, it can be on the construction site can only be produced with considerable effort in the case of adapters. The relation of this Tension-proof screw socket is therefore very limited (culverts etc.).

The general use of a screw socket that is resistant to tension and thrust requires that the spigot end of the pipes and fittings or fittings not be machined requirement. This requirement fulfills the tensile and shear strength described below Screw socket connection which is the subject of the invention.

The face of the new screw socket connection is the normal one Screw ring (a) at an angle O; turned inwards. The screw ring (a) closes a slotted compression ring (b) made of hard material attaches itself to its contact surface is also conical and has the same inclination. About the deflection To allow in the socket, this surface (c) is made spherical on the Inner surface of the press ring are sharp-edged elevations (d) present, which press into the surface of the pipe when the screw ring is tightened. Subsequently, a closed slip ring (e) and the normal one close Sealing ring (f) made of rubber.

If the screw ring (a) is now inserted into If the socket is tightened, the deformation and compression inevitably take place first of the sealing ring (f) until the sealing chamber is completely filled. So that is the prerequisite for the following process.

If the screw ring is tightened further, the axial thrust will be increased by means of the conical surfaces of the screw ring and the press ring (b) into a radial one Force diverted, with the help of the press ring with its sharp-edged elevations is pressed on the pipe. The gap in the press ring (b) is kept so large that he is in this process despite the tolerances of the outer diameter of the pipe can't quite close. By pressing in the press ring with its sharp-edged Increases in the pipe surface, the frictional force is so great that the occurring Tensile and shear forces are transmitted via & n screw ring. It increases Example I increases the frictional force due to the wedge effect with the tensile force.

Pressing the press ring (b) onto the pipe requires the lines a considerable force with a larger diameter. To diminish this force will the compression ring (b) provided in its circumference with radial incisions, so that the Material thickness is reduced in these places. These cuts can become on the inside (g) or outside (a) and also in a staggered arrangement on both Pages are located. Apart from reducing the force required for the Pressing the press ring, the incisions on the inside have the advantage of that the press ring in the case of irregularities in the pipe as a result of the division of its circumference in several sectors much better and with less effort on the surface of the pipe adapts. This effect is significant for the transmission of forces and brings the necessary security.

In order to achieve the aforementioned advantages, the press ring can be in several Parts with appropriate spacing are made by an endless spiral spring (i) or held together by a steel wire lying in a groove.

With this training, the split press ring is already in place when it is applied with a slight bias on the pipe.

The transmission of the tensile and thrust forces can also be achieved by means of a Compression ring made of a material that is significantly softer than the pipe material (metal or plastic). In this case, the material of the press ring cast so deformed that the frictional force generated thereby is greater than the tensile force or shear forces.

The training t and II shown in the drawing are only Examples of the principle described above, which can still be varied in many ways can.

The device is also analogous to lines that have already been laid to be retrofitted with screw sockets. For this purpose, the existing screw ring is needed removed. In the further process, a split sliding ring (e), which is before the insertion is joined together, applied to the sealing ring (f). This is followed by the split press ring with spiral spring (i).

The screw ring that follows is divided into two parts and has? Joints a toothing. On its face there is a device that the two Tetle holds together (e.g. two holes each through a bracket to be hammered get connected).

This tension and thrust fixed screw connection, which is still movable remains, brings great benefits in practice thanks to the development of the ductile iron pipe Advantages in pipeline construction with them.

Claims (1)

Claims. 1.) Tensile and shear-proof screw connection for line pipes, d u r c h e k e n n n z e i c h n e t that by tightening the screw ring generated axial thrust, after pressing the sealing ring is deflected into a radial force by the arrangement of conical surfaces, with The help of a split or split press ring (b) with sharp-edged elevations (d) the end of the pipe is pressed against the resulting tensile and shear forces transferred via the screw ring, 2o) screw socket connection according to @@@ pruch 1.), that the conical surface of the press ring (c), the conical surface of the screw ring or the conical surface of the sliding ring (II) or both are convex. 3.) screw socket connection according to claim 1.), d a d u r c h g e k It is noted that the slotted press ring (b) on its inner (g) or Outer side (h) or offset radial incisions on both sides o 4.) Screw socket connection according to claim 1.), d a d u r c h g e ii n r e i c h n e t that the press ring (b) is divided radially and by means of an elastic one Material of the existing ring is held together.