JPH0722558Y2 - Piping elbow reinforcement structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a reinforcing structure for a piping elbow.

[Prior Art] Conventionally, pipes used in various plants are purposely bent (a so-called pipe elbow is formed) so that large stress does not act as a result of expansion and contraction due to temperature change. The piping elbow was designed to give flexibility to the expansion and contraction of the piping.

[Problems to be solved by the invention] However, the pipe elbow provided in the middle of the above-mentioned pipe is
When the pipe expands and contracts due to temperature changes, a moment is applied and the cross section is deformed in the bending or stretching direction while flattening, and it is possible to prevent large stress on the pipe, but on the other hand, the amount of flattening the cross section becomes large and it is crushed. The moment value (so-called collapse moment (strength)) at the time of collapse was small.

If the collapse moment of the piping elbow is small, there is a problem that the load load when using the plant is limited by the collapse moment (strength) of the piping elbow. However, there is a problem that it cannot be used under more severe load conditions.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a reinforcing structure for a pipe elbow that increases the collapse moment while maintaining the flexibility of the pipe elbow.

[Means for Solving the Problem] The present invention provides a pipe elbow in which a middle portion of the pipe is bent so that the outer peripheral surface of the pipe elbow is larger than the outer diameter of the pipe elbow and Reinforcement of a pipe elbow, characterized by externally fitting a ring-shaped or frame-shaped reinforcing member that is open to the outside and surrounds with a required gap smaller than the width when flattened and collapsed. It depends on the structure.

[Operation] Therefore, in the present invention, when the pipe expands and contracts due to temperature change and a moment is applied to the pipe elbow, the pipe elbow is freely deformed in the bending or extension direction while the section is flattened. When the flattening of the pipe elbow progresses, the pipe elbow contacts the reinforcing member,
Further flattening is restricted. This prevents the pipe elbow from collapsing.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention.

Reference numeral 1 denotes a pipe elbow formed by bending the middle portion of the pipe 2.

A reinforcing member such as a reinforcing ring 3 having an inner diameter larger than the outer diameter of the pipe elbow 1 is fitted onto the pipe elbow 1.

The reinforcement ring 3 is locked or fixed by a piece 4 attached to the pipe elbow 1 (in FIG. 1, the piece 4 and the reinforcement ring 3 are separated from each other for easy understanding).

When the pipe 2 expands and contracts due to temperature change, a moment is applied to the pipe elbow 1, and the pipe elbow 1 bends from a state shown by a solid line in FIG. 1 to a state shown by a virtual line (θ shows a deformation angle at this time), At the same time, the cross section of the pipe elbow 1 is the second
As shown by the phantom line in the figure, the flattening is performed so as to spread in the direction perpendicular to the bending direction, and large stress is prevented from occurring in the pipe 2 other than the pipe elbow 1 portion.

At this time, if the moment applied to the pipe elbow 1 increases, the flatness that spreads in the direction perpendicular to the bending direction of the pipe elbow 1 increases, and there is a fear that the pipe elbow 1 will be crushed. Since the reinforcing ring 3 is externally fitted, when the pipe elbow 1 spreads in the direction perpendicular to the bending direction and comes into contact with the reinforcing ring 3, the reinforcing ring 3 restricts further flattening of the pipe elbow 1, so that the moment As shown in FIG. 3 showing the relationship of the deformation angle, as compared with the collapse moment (b) of the line (a) showing the conventional pipe elbow 1, the pipe elbow 1 of the present invention has a line as shown by the line (c). The moment is rapidly increased from the deformation angle (d) when it spreads in the direction perpendicular to the bending direction and comes into contact with the reinforcing ring 3, and the collapse moment can be made larger (e).

At this time, since the inner diameter of the reinforcing ring 3 is larger than the outer diameter of the pipe 2, a small flattening of the pipe elbow 1 which does not reach a normal collapse moment, is prevented.
Therefore, the flexibility of the pipe elbow 1 is secured.

Further, since the reinforcing ring 3 has a circular shape, the expansion due to the flattening of the pipe elbow 1 can be restricted in all directions.

FIG. 4 is an explanatory view of another embodiment of the present invention. In a structure similar to that of FIG. 1, the reinforcing ring 3 is provided on the heat insulating material 5 when the pipe 2 is covered with the heat insulating material 5 or the like. The notch 6 is used for locking, and even in this case, the collapse moment can be increased while maintaining the flexibility of the pipe elbow 1.

FIG. 5 is an explanatory view of still another embodiment of the present invention, in which the reinforcing ring 7 has a structure in which the split pieces 8 and 9 are fastened with bolts 10. Since it is possible to increase the collapse moment while maintaining the flexibility of, and it is possible to attach it to the piping elbow 1 of the existing plant, it can be applied when the existing plant is used under more severe load conditions. It will be possible.

FIG. 6 is an explanatory view of another embodiment of the present invention, and in a configuration substantially similar to that of FIG. 2, when the direction in which the pipe elbow 1 is flattened and spread is always determined, the reinforcing ring 3 is used as a reinforcing member. A reinforcing frame 11 having a rectangular cross section is externally fitted in place of 7 and 7, and even in this case, the collapse moment can be increased while maintaining the flexibility of the pipe elbow 1.

The reinforcing structure of the pipe elbow according to the present invention is not limited to the above-described embodiment, and the reinforcing member may have any shape as long as it can limit flattening of the pipe elbow to a certain extent or more. It goes without saying that the method of attaching the reinforcing member to the pipe elbow is arbitrary, and various modifications can be made without departing from the scope of the present invention.

[Effects of the Invention] As described above, according to the reinforcing structure of the pipe elbow of the present invention, when the outer peripheral surface of the pipe elbow is larger than the outer diameter of the pipe elbow and the pipe elbow is flattened and crushed. Enclose with the required clearance smaller than the width dimension of
A ring-shaped or frame-shaped reinforcing member that is open to the outside is fitted to limit the flatness of the piping elbow above a certain level, so the collapse moment can be increased while maintaining the flexibility of the piping elbow. An excellent effect such as obtaining can be obtained.

[Brief description of drawings]

FIG. 1 is an illustration of an embodiment of the present invention, and FIG. 2 is an illustration of FIG.
II-II arrow view, FIG. 3 is a diagram showing the relationship between the moment and the deformation angle, and FIG. 4 is an explanatory view of another embodiment of the present invention.
FIG. 6 is an explanatory view of still another embodiment of the present invention, and FIG. 6 is an explanatory view of another embodiment of the present invention. In the figure, 1 is a pipe elbow, 2 is a pipe, 3 and 7 are reinforcing rings, 11
Indicates a reinforcing frame.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A pipe elbow formed by bending the middle portion of the pipe, wherein the outer peripheral surface of the pipe elbow is larger than the outer diameter of the pipe elbow, and the width when the pipe elbow is flattened and crushed. A reinforcing structure for a pipe elbow, characterized in that a ring-shaped or frame-shaped reinforcing member which is open to the outside and is surrounded by a required clearance smaller than the size is externally fitted.