JPH10185001A - U-bolt with stopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting operation at work sites, and also shorten its execution time in correction with the U-bolt for mounting the pipeline onto the various kinds of production plants. SOLUTION: A constitution of the U-bolt to be used when it is used to be threadedly fixed to the pipe-line P to the support steel 6 of the kind of plants with the U-bolt 2, the stoppers 1 which are made out of stainless steel and carbon steel, are thick in wall, and are provided with split flat washers, are welded so as to be fixed to placed close to each position in which a gap between the pipeline P and the U-bolt 2 is as specified where the aforesaid pipeline is in the vicinity of each insertion part to the support steel 6 positioned at the surface side of the support steel 6 set so as to be continuous to both the end screw parts of the U-bolt 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a U-bolt capable of adjusting a gap applied to an installation work of a U-bolt in a nuclear power plant or other various plants.

[0002]

2. Description of the Related Art FIG. 2 shows the structure of a conventional U-bolt for installation of piping or the like. In the drawing, P indicates a piping attached to a support steel material 6 of a plant or the like.

[0003] The pipe P is installed on the front side of a support steel material of a plant by a U-bolt 2. At this time, conventionally, the lock nut 10 is screwed into a threaded portion provided at both ends of the U-bolt 2, and the pipes P and U are conventionally mounted. Gap management is performed so that the gap 3 with the bolt 2 becomes a specified value.

At this time, the lock nut 10 to be screwed into the threaded portion of the U-bolt 2 needs to be screwed in until the gap 3 becomes close to a specified value for gap management, and this work is troublesome. I was 4 is a spacer, 5 is a washer, 7
Is a hexagon nut for tightening.

[0005]

When installing U-bolts in conventional plants, first, in various plants, the lock nut 10 screwed into the U-bolt and the hexagonal nut 7 for tightening are removed, and the U-bolt is removed. Then, the lock nut 10 is screwed into the U-bolt 2 and the U-bolt is lowered so as to come into contact with the pipe P.

After the gap between the support steel 6 and the pipe P is adjusted by the lock nut 10, the support steel 6 is tightened and fixed from the back side by the hexagon nut 7.

If there is a gap between the support steel 6 and the pipe P even after the U bolt 2 is installed, the hex nut 7 is again inserted to insert the spacer 4 between the lock nut 10 and the support steel 6. Removal, lock nut 10
And the U bolt 2 must be raised from the pipe P.

The conventional means as described above has a problem that it takes time to attach and remove the lock nut 10 for adjusting the clearance.

The present invention has been made in order to solve the above problems.
By attaching a stopper to the U-bolt by welding instead of the conventional lock nut at a position where the specified gap between the pipe and the U-bolt is satisfied in advance, it has become possible to omit the work of screwing the lock nut on site. It is intended to provide a new U-bolt with a stopper.

[0010]

In order to achieve the above object, a U-bolt with a stopper according to the present invention is provided in a U-bolt for mounting a pipe on a support steel material in various plants and the like. At the position near the insertion part into the support steel material connected to the threaded part, the thick washer made of stainless steel and carbon steel and the flat washer were formed in half so that the gap between the pipe and the U-bolt became the specified value in advance. The stopper is welded and fixed.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 is an explanatory view showing a configuration and a tightened state of a U-bolt with a stopper according to the present invention, FIG. 3 is a half-type stopper to be welded to the U-bolt, (a) is a plan view, (b) is a front view, c) is a side view.

In these figures, P is a pipe, 2 is a U-bolt having threaded portions at both ends, 6 is a support steel material, 4 is a spacer, 5 is a washer, and a threaded portion at both ends of the U-bolt 2 is a support steel material. 6 is inserted to the back side of the support steel material 6 through the through hole provided in 6, and is fixedly fastened by a hexagon nut 7. Reference numeral 8 denotes a rotation stopper.

The U side of the U bolt 2 is provided on the front side of the support steel 6.
The U-bolt 2 is screwed in such a manner that the pipe P is fitted and held in the character-shaped portion.

In the vicinity of the portion of the U-bolt 2 which is connected to the threaded portion at both ends of the U-bolt 2 and near the insertion part of the U-bolt 2 in the support steel material located on the front side of the U-bolt 2, a position where the specified gap between the pipe P and the U-bolt 2 is satisfied The stopper 1 is attached by welding W instead of the lock nut described above.

As the structure of the stopper 1, as shown in FIG. 3, a flat washer having a half-split shape is employed. A stainless steel or carbon steel material having a large thickness is used.

When installing the U-bolt 2 on the support steel member 6, first remove the hexagonal nuts 7 for screwing on both ends of the U-bolt on the back side of the support steel member 6, and then remove the U-bolt 2.
Only the work of fitting the U-shaped bent portion of the bolt 2 around the outer periphery of the pipe P, threading both ends of the bolt through the support steel material 6, and turning and tightening the hexagonal nut 7 for tightening on the back side of the steel material 6 is sufficient. This eliminates the necessity of screwing the lock nut as in the related art. As a result, the labor for installing the U bolt is reduced.

The position where the stopper 1 is fixed to the U-bolt 2 by welding is the position where the lock nut is originally located so that the gap 3 between the pipe P and the U-bolt 2 has a predetermined value in advance. The stopper is welded to the U bolt 2 at a factory in advance.

The reason why the thick flat washer is formed in half as the stopper 1 is to prevent the stopper from catching on the pipe when the U-bolt is installed on the pipe.

When there is a gap between the pipe P and the support steel material 6, the spacer 4 is inserted. However, when the spacer 4 is inserted, it is not necessary to loosen the lock nut as in the prior art.

From the above, it is possible to shorten the time required for installing pipes using U-bolts to the support steel, and at the same time, to expose the radioactivity to a high dose area particularly in the case of installation work in a nuclear power plant. The amount can be reduced.

[0021]

As described above, the U with stopper according to the present invention is
The bolt has the following effects. (1) The U-bolt with stopper of the present invention manufactured at the factory does not need to remove and screw in the lock nut from the U-bolt as it was conventionally at the time of on-site installation. After insertion into the hole, installation is possible only by screwing the hexagon nut, and the construction time can be greatly reduced.

(2) If there is a gap between the pipe and the support member, it is necessary to insert a spacer. Even in such a case, there is no operation of the lock nut as in the conventional case, and the hexagonal bolt for tightening must be removed. From support steel
Bolts can be pulled out for easy operation.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a U-bolt with a stopper according to the present invention.

FIG. 2 is a configuration diagram of a conventional U-bolt for installation such as piping.

3A and 3B are configuration diagrams of a stopper to be welded to a U bolt according to the present invention, wherein FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stopper 2 U bolt 3 Gap between pipe and U bolt 4 Spacer 5 Washer 6 Support steel material 7 Hex nut 8 Detent P Pipe W Weld

Claims (1)

[Claims] 1. A U-bolt for mounting a pipe on a support steel material in various plants, wherein a pipe and a U-bolt are previously placed at a position near an insertion portion of a support steel material connected to a threaded portion at both ends of the U-bolt. A U-bolt with a stopper, characterized in that a thick stopper made of stainless steel and carbon steel and a flat washer having a half-shape shape is welded and fixed so that the gap becomes a specified value.