JPH04244690A - Pipe coupling clamp - Google Patents

Abstract

PURPOSE:To keep off any vibration or the like in pipelines and so on by coupling plural pipelines installed bristly in a narrow space simultaneously and easily for clamping with certainty. CONSTITUTION:A moving clamp 12 is engaged with a holding clamp 11 provided with plural clamp parts 17a and a shaft part 18 free of movements, while plural piping clamps 12a are installed in this moving clamp 11 as well so as to make each oppose these clamp parts 17a, and a fixed member 14, which locks a position at a time when the moving clamp 12 couples and clamps each pipeline 3 together with the holding clamp 11, is engaged with the shaft part 18 of this holding clamp 11.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting clamp that is capable of simultaneously and easily connecting and clamping a plurality of pipes arranged in a forest in a narrow space.

0003

[Prior Art] Generally, inside power plant buildings, nuclear reactors, boilers, and other equipment, a large number of pipes are arranged in a forest shape in a narrow space, and spacers etc. are used to prevent them from interfering with each other. The pipes are connected to maintain the distance between the pipes.

For example, in a boiling water reactor in which a large number of pipes are installed as shown in FIG. , a steam separator 4, a fuel assembly 5, a control rod 6, and a control rod drive mechanism 7. As is well known, the fuel assembly 5 is a large number of columnar members in which fuel is sealed, and these are arranged in the longitudinal direction with appropriate gaps between them. Furthermore, a control rod 6 is inserted into these gaps so as to be movable in the longitudinal direction. The control rod 6 is moved in the vertical direction by a control rod drive mechanism 7 provided at the bottom of the pressure vessel 2 via a rod 7a.

The inside of the pressure vessel 2 is filled with reactor water 8 up to an appropriate level above the fuel assembly 5, and this reactor water 8 flows into the reactor 1.
It has the function of moderator and coolant. The heat generated by nuclear fission is then transferred to reactor water 8. This reactor water 8 is boiled and separated into steam and liquid by the steam separator 4, and then sent to a steam turbine (not shown) via the steam outlet 2a. Further, the control rods 6 control the output of the nuclear reactor 1 by appropriately absorbing neutrons emitted by nuclear fission (by moving the control rods 6 in and out with the control rod drive mechanism 7).

However, when the nuclear reactor 1 is operated continuously for a long period of time, vibrations occur in the pipes arranged in a forest inside the pressure vessel 2 for some reason. If this is left untreated, it may progress further and cause cracks in the piping. Such a situation within the reactor 1 is undesirable and the pipes must be clamped together to reduce vibration.

[0007]

[Problems to be Solved by the Invention] However, when clamping multiple pipes together, the work is not only extremely difficult when the space is narrow or when the joint location is remote, such as at a high place or underwater. In addition, holding the pipes during underwater welding to join them underwater is very inconvenient and requires a lot of work time. In nuclear power plants, etc., there is a risk that workers may be exposed to large amounts of radiation.

The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to simultaneously and easily connect and clamp a plurality of pipes arranged in a narrow space, and to reduce the vibration of the pipes. An object of the present invention is to provide a pipe connection clamp that can prevent the above problems. [Structure of the invention]

[0009]

[Means for Solving the Problems] The present invention has a shaft portion,
A holding clamp provided with a plurality of first pipe clamp parts, and a plurality of second pipe clamp parts provided movably engaged with the holding clamp and facing each of the first pipe clamp parts. The movable clamp includes a movable clamp, and a fixing member that engages with the end of the shaft portion and fixes the movable clamp in a predetermined position.

0010

[Operation] The moving clamp is in an expanded state, and multiple first
The holding clamp is set by bringing each of the pipe clamp parts into contact with one side of the plurality of pipes, and then the moving clamp is narrowed to bring the plurality of second pipe clamp parts into contact with the other side of the plurality of pipes. By bringing them into contact and then fixing the position of the moving clamp via the fixing member, a plurality of pipes can be connected and clamped simultaneously and easily.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing one embodiment of the present invention.

In FIG. 1, the pipe connection clamp 10 is
It is composed of a holding clamp 11, a moving clamp 12 that movably engages with the holding clamp 11, a fixing member 14 and a spacer 15 that fix the state in which the moving clamp 12 clamps the pipe 13. . Therefore, the holding clamp 11 has a holding clamp main body 17,
It consists of a shaft part 18 that is integrally provided on the front side (left side in the figure) of this holding clamp body 17, and the holding clamp body 17 has two inverted V-shaped pipe clamp parts 17a on the tip side. They are provided at a total of three locations, one location on the front side of this, and the shaft portion 18 includes a guide portion that prevents rotation of the moving clamp 12 and only allows movement in the axial direction, an insertion portion for the fixing member 14, A groove 18a is provided at the end of the insertion portion of the fixing member 14 for fitting a jig (not shown) used for holding the pipe coupling clamp 10 during construction and for tightening the pipe 13. In addition, the moving clamp 12 has three V-shaped pipe clamp parts 12a facing the pipe clamp parts 17a of the holding clamp 11, and the front part is attached to the shaft part 18 of the holding clamp 11. It is movably engaged with the provided guide part. Here, since the pipe clamp part 12a on the near side is provided in a hollow part, the pipe 13
It is formed at two locations along the axial direction (vertical direction in the figure).

The above-mentioned fixing member 14 is made of a cylindrical shape memory alloy, and the inner diameter is expanded and deformed in the circumferential direction (
This is inserted into the end side of the shaft portion 18, and when the moving clamp 12 is in a predetermined position, it is heated by an appropriate means to reduce the inside diameter and fixed to the shaft portion 18. .

Next, the operation of the embodiment configured as above will be explained. First, the moving clamp 12 is moved to the front side to widen the space between the pipe clamp part 12a and the opposing pipe clamp part 17a. In this state, it is set on the piping 13 from the side using a jig (not shown), and the movable clamp 12 is gradually narrowed together with the fixing member 14, so that the three pipings 13 are connected and clamped at the same time. Thereafter, the moving clamp 12 and the holding clamp are fixed together by heating the fixing member 14 and returning it to its original state with a small inner diameter.

Therefore, in the embodiment configured as described above, since the fixing member 14 is made of a memory alloy, the fixing force to the shaft becomes stronger as the ambient temperature rises compared to when it is attached, and it can be used at high temperatures compared to ordinary screw fastening. To surely connect and clamp three pipes 13 without fear of loosening due to temperature change or temperature change.

[0016] The present invention is based on the above-mentioned embodiments (hereinafter referred to as
The present invention is not limited to the first embodiment, and various modifications can be made. FIG. 2 is a plan view showing a second embodiment of the invention. In this embodiment, five pipes 13 can be clamped at the same time. That is, Figure 2
In the pipe coupling clamp 20, the holding clamp 2
1, a moving clamp 22 that movably engages with this holding clamp 21, and this moving clamp 22
It is composed of a fixing member 14, a spacer 15, and a nut 16 for fixing the clamped state of the device 3. Therefore, the holding clamp 21 has a holding clamp main body 23,
It consists of a shaft part 24 that is integrally provided on the front side (lower side in the figure) of this holding clamp body 23, and the holding clamp body 23 has an inverted V-shaped pipe clamp part 23 on the tip side. A guide portion is provided at two locations, two locations on the intermediate side, and one location on the front side, for a total of five locations, and the shaft portion 24 has a guide portion that prevents rotation of the moving clamp 22 and only allows movement in the axial direction. An insertion portion of the fixing member 14 and a threaded portion into which the nut 17 is screwed are provided, and the end of the threaded portion is provided with a groove 24a for fitting a jig (not shown), as in the first embodiment. In addition, the moving clamp 23 has five V-shaped pipe clamp parts 23a facing the pipe clamp parts 23a of the holding clamp 21, and the front part is attached to the shaft part 24 of the holding clamp 21. Engage movably. In this second embodiment as well, when connecting and clamping the pipes 13, the five pipes 13
can be combined and clamped at the same time. In addition, in the case of this second embodiment, even if the nut 16 becomes loose, it does not affect the clamping force.

FIG. 3 also shows a third embodiment of the present invention.
FIG. This embodiment also connects and clamps three pipes 13 at the same time, similar to the first embodiment. That is, in FIG. 3, the pipe coupling clamp 30
is composed of a holding clamp 31, a moving clamp 32 that movably engages with the holding clamp 31, a fixing member 14 and a spacer 15 that fix the state in which the moving clamp 32 connects and clamps the pipe 13. has been done. The holding clamp 21 is composed of a holding clamp body 33 and a shaft portion 34 that is integrally provided on the front side (lower side in the figure) of the holding clamp body 33. The pipe clamp part 33 has an inverted V shape.
a are provided at three locations in total, two on the tip side and one on the front side, and the shaft portion 34 includes a guide portion that prevents rotation of the moving clamp 32 and only allows movement in the axial direction; A groove 34a for fitting a jig (not shown) is provided at the end of the insertion portion of the fixing member 14, as in the first embodiment. Further, the moving clamp 32 has three V-shaped pipe clamp parts 32a facing the pipe clamp part 33a of the holding clamp 31, and a pin 35 is fixed at approximately the middle position of these pipe clamp parts 32a. , the front side portion is movably engaged with the shaft 34 of the holding clamp 31. Here, the pin 35 is slidably inserted into a long hole 33b provided in the holding clamp main body 33, and guides the moving clamp 32 during movement. In this embodiment as well, when the pipes 13 are jointly clamped, three pipes 13 can be jointly clamped at the same time using the same procedure as in the first embodiment.

Furthermore, in each of the embodiments described above, the piping 13
Although the pipes are of the same diameter, even if the pipes have different diameters or pitches, if the dimensions and shapes of each part are matched, the pipes can be clamped in the same way as in each of the above embodiments. can.

[0019]

As explained above, according to the present invention, a moving clamp in which a plurality of pipe clamp parts are provided opposite to a plurality of pipe clamp parts provided in a holding clamp can be attached to a holding clamp. Since it can be engaged movably and fixed in a predetermined position, multiple pipes arranged in a forest in a narrow space can be easily and reliably connected and clamped at the same time, and remote control is also possible. A pipe coupling clamp can be provided that prevents vibration.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is a plan view showing another embodiment of the present invention.

FIG. 3 is a plan view showing still another embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an example of a state in which a plurality of pipes are arranged in a forest shape in a narrow space.

[Explanation of symbols]

11, 21, 31... Holding clamp, 12, 22, 32
...Moving clamp, 12a, 17a, 22a, 23a,
32a, 33a... Piping contact portion, 13... Piping, 14... Fixing member, 18, 24, 34... Shaft portion.

Claims (1)

[Claims] 1. A holding clamp having a shaft portion and provided with a plurality of first pipe clamp parts, and a holding clamp movably engaged with the holding clamp and facing each of the first pipe clamp parts. The present invention is characterized in that it is comprised of a moving clamp provided with a plurality of second piping clamp parts, and a fixing member that engages with the end of the shaft part and fixes the moving clamp in a predetermined position. Pipe connection clamp.