JPH0313021Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe clamp for suspending piping in factories, power plants, etc., and is particularly suitable for supporting heavy, large-diameter pipes. For example, nuclear power plants sometimes use pipes with a diameter of about 1 m, and the load on the clamp in this case can reach 20 tons. This repeatedly changes the temperature from room temperature to about 500 degrees Celsius. Special measures are required to withstand this.

[Conventional technology]

A clamp (Fig. 2) in which a flat end edge is connected to both ends of an arcuate part is known, but the insertion position of the bolt into the opposing clamp piece is determined from the connection point between the arcuate part and the end edge. must be kept separate. This is to ensure that the bolt head and nut are in surface contact with the edge portion without coming into contact with the arcuate portion. As a result, the distance L from the center of the tube to the bolt increases accordingly, and a bending moment is generated at the end edge, which becomes a hindrance to tightening the arcuate portion firmly.

In order to compensate for this, as shown in Fig. 3, a triangular reinforcing member R is arranged near the connection point, and one side of the reinforcing member R is welded to the arc portion, and one of the remaining two sides is welded to the edge. ing. In the case of large pipes, both the clamp piece and the reinforcing member are large in size, so welding and heat treatment are not easy. Furthermore, since the clamp piece and the reinforcing member have different sizes, there is a difference in thermal expansion, and when the pipe undergoes repeated temperature changes, there are cases where cracks occur in the welded part.

[Means of problem solving]

The reinforcing member R is abolished and replaced with a backing plate that does not require welding. In other words, the inner surface can fit tightly across both the arcuate part and the edge, and the outer surface uses a contact plate that is parallel to the edge, presses it against both clamp pieces, and tightens it with bolts and nuts that pass through the four parts. Do it like this.

〔Example〕

FIG. 1 will be explained. The symmetrical pair of clamp pieces 1 consists of a circular arc portion 1a and a flat edge portion 1b that is bent and connected at both ends thereof. The contact plate 2 is applied across the arc portion and the edge portion, and the inner surface can be closely attached to both, and the outer surface is formed parallel to the edge portion.

The tightening bolt 3 passes through both clamp pieces and both butts and is tightened with a nut 4. The tightening bolt 3 is located near the tangent to the circle formed by the arc portion 1a. In addition, another retaining bolt 5 is attached to the outer end of one end edge.
is inserted and suspended from the upper structure via a constant hanger H, as shown in FIG. 4, for example.

In order to clarify the effect of the present invention, it will be compared with FIG. 2 of the conventional structure. In FIG. 2, the tightening bolt is displaced outward from the tangential position described above, and the distance L between the bolt and the center of the tube increases, making it impossible to avoid applying a bending moment to the end edge. On the other hand, in the present invention shown in FIG. 1, the corresponding distance is 1, which is smaller than that, and even when the nut 4 is tightened, no bending moment is generated at the end edge, and the arc portion is only pulled in the tangential direction. This allows reliable tightening.

However, when the nut 4 is tightened, excessive tension is applied to the arc portion, which may cause the clamp piece to deteriorate. If it is necessary to avoid this, as shown in Fig.
Set it up. By appropriately positioning the nut 6, it can act as a stopper to prevent the nut 4 from being overtightened. A pair of nuts 6
Alternatively, a pipe of an appropriate length may be inserted into the bolt 3. It is also useful for stabilizing the tightening of the plate after tightening.

〔effect〕

Eliminates welding work. Since the plate is simply bolted to the clamp piece, repeated thermal stresses will not cause cracks between the associated parts. Since the force acts only in the tangential direction of the pipe, tightening is ensured.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, FIG. 2 is a front view of a known example, FIG. 3 is a front view of another known example, and FIG. 4 is an explanatory view of the present invention in use. 1... Clamp piece, 1a... Arc part, 1b...
Edge portion, 2...Plate, 3...Tightening bolt, 4...
Nut, 5... Retention bolt, 6... Nut, R...
...Reinforcement member, H...Hanger.

Claims (1)

[Scope of utility model registration request] A pair of opposing clamp pieces consisting of a circular arc portion and a flat edge portion whose both ends are bent on the same line; a pair of abutting plates, each having an outer surface parallel to the end edge so as to be able to be closely attached to the end edge; a tightening bolt and a nut passing through both the clamp pieces and the abutting plates in proximity to the bending point; A pipe clamp consisting of a locking bolt and nut inserted through the outer ends of both clamp pieces.