JPH07190255A - Piping support device - Google Patents

Abstract

PURPOSE:To provide a piping support device which eliminates influence of expansion of a pipe due to heat in the diameter direction, restricts and supports the pipe in the direction to be restricted against heat displacement of the pipe with certainty. CONSTITUTION:A pair of half divided clamp bands 2A, 2B are divided in a direction Y-Y' perpendicular to a displacement direction X-X' of a pipe 1 to be restricted, and surrounds the pipe 1 from both sides. Installing lugs 5 are arranged on both ends of one clamp band, and each having a pin hole 8 located on a division line of the clamp bands 2A, 2B. Two support rods 3 have, each, one end installed in the pin hole 8 of the installation lug 5, and the other end fixed at a fixation part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe supporting device,
In particular, the present invention relates to a pipe support device used for pipes such as a pipe system of a fast breeder reactor whose temperature rises significantly.

[0002]

2. Description of the Related Art Generally, in a piping system such as a fast breeder reactor using liquid metal sodium as a coolant, displacement of the pipe due to heat (displacement in which the center of the pipe moves in a direction orthogonal to the axial direction of the pipe by heat, In order to reduce a reaction force load due to thermal displacement), a pipe support device for restraining thermal displacement of the pipe has been provided near the equipment.

FIG. 5 shows an example of use of a conventional pipe support device. The pipe 30 has a horizontal portion, rises vertically from this horizontal portion via an elbow 31, and the upper end is connected to a nozzle 33 of a vertical pump 32.

A pair of clamp bands 34a and 34b in a half-divided shape are attached to the vertical portion of the pipe 30. One end of a support rod 36 is pin-coupled to a mounting lug 35 of the support provided on the clamp band 34a on one side. The other end of the support rod 36 is rotatably attached to a wall 38 via a clevis 37.

FIG. 6 shows the structure of the above-mentioned conventional pipe support device in a horizontal plane. Clamp band 34a, 34b
Is connected at both ends with bolts 39, and pipes 3
Holds 0.

The two mounting lugs 35 form a predetermined angle in a radial direction from the center O of the pipe as shown in the figure, and the clamp band 34 is formed.
It is attached to a. Two support rods 36 are attached in parallel between the tip of each attachment lug 35 and the clevis 37. The mounting direction of the support rod 36 is mounted parallel to the direction P of thermal displacement of the pipe.

In the above-mentioned conventional pipe support device, the inner radius of curvature of the clamp bands 34a and 34b is set larger than the outer radius of curvature of the pipe 30. At a predetermined portion near the connecting portion of the clamp bands 34a and 34b, the pipe 3
A gap G is formed between 0 and the clamp bands 34a and 34b. The gap G is provided between the pipe 30 and the clamp bands 34a and 34b when the temperature of the pipe 30 changes suddenly.
It is dimensioned to absorb the difference in thermal expansion between and.

This conventional pipe support device can restrain the thermal displacement of the pipe 30 in the direction P.

However, when the temperature of the pipe 30 rises significantly, the pipe 30 thermally expands in the radial direction, and the clamp bands 34a and 34b and the mounting lug 35 also thermally expand.

For example, in the pipe 30 having an outer diameter of 500 mm, the pin connecting portion of the support rod 36 of the mounting lug 35 is located at a position separated from the pipe center O by about 350 mm. In this case, when the temperature of the pipe 30 rises by about 300 ° C, it is about 1.9 mm in the radial direction.
The expansion causes the pipe center O to be displaced by 1.9 × ^{1/2 1/2} = 1.3 mm in the P direction with respect to the pin coupling portion of the mounting lug 35.

Usually, this degree of pipe displacement may be tolerated, but it is a problem for equipment such as a vertical pump which requires the deformation to be kept as small as possible.

On the other hand, there has been proposed a pipe supporting device which eliminates the influence of thermal expansion in the radial direction of the pipe as shown in FIG. In FIG. 7, the pipe 30 has a center O of the pipe.
In addition, a pair of clamp bands 40a and 40b, each of which is divided in half by a plane parallel to the direction P of thermal displacement, is attached. Both ends of the clamp bands 40a and 40b are connected to each other by bolts 41. The support mounting lug 4 is provided on the outer side of the clamp bands 40a and 40b in the direction perpendicular to the direction P including the pipe center O.
2 is welded. One end of a support rod 43 is pivotally attached to the tip of the mounting lug 42. The other end of the support rod 43 is attached to the wall 45 via the clevis 44.

A clamp band 40a near the bolt 41,
A gap G for absorbing thermal expansion of the pipe in the radial direction is provided between 40b and the pipe 30.

According to this pipe support device, even if the pipe thermally expands in the radial direction due to heat, the thermal expansion spreads on both sides with respect to the line connecting the pin coupling portions of both mounting lugs 42.
Theoretically, the position of the center O of the pipe does not move due to thermal expansion.

[0015]

However, the conventional pipe supporting apparatus which absorbs the thermal expansion in the radial direction theoretically eliminates the effect of the thermal expansion in the radial direction and restrains the thermal displacement. However, in reality, the pipe moves in the clamp band by the amount of the gap G due to thermal displacement, and after contacting the clamp band, the pipe center O further moves due to thermal expansion in the radial direction.

Such a pipe support device is inconvenient for strictly managing thermal displacement or reaction force / stress. Further, in any of the above conventional pipe support devices, since the effect of thermal expansion in the radial direction of the pipe cannot be eliminated, even if a load meter is provided on the support rod or the like, the measured value of the load meter will not be affected by the thermal displacement of the pipe. Since the reaction force due to the thermal expansion in the radial direction is included in addition to the force, the reaction force of the pipe could not be accurately grasped.

Further, in the configuration of the conventional pipe support device shown in FIG. 5, since the pipe support device supports the pipe between the pump nozzle and the lower elbow, the load Fx of the pipe reaction force can be reduced, but the moment My cannot be reduced.

Generally, the moment M with respect to the equipment nozzle
Although the influence of y is small, it may be necessary to consider the influence of the moment My depending on the characteristics of the equipment to which the pipe is connected.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, eliminate the influence of radial expansion of the pipe due to heat, and surely restrain the pipe in a direction to be restrained against thermal displacement of the pipe. -To provide a pipe support device that can be supported.

Another object of the present invention is to provide a pipe support device capable of suppressing both the load and the moment of the reaction force due to the thermal displacement of the pipe.

Still another object of the present invention is to provide a pipe support device capable of monitoring the pipe reaction force due to thermal displacement.

[0022]

In order to achieve the above object, the pipe supporting apparatus according to the first invention of the present application is divided into two in a direction orthogonal to the direction of displacement of the pipe to be constrained, and a half that surrounds the pipe from both sides. A pair of split clamp bands and a mounting lug for the support, which is provided on each end of one clamp band and has a pin hole on the dividing line of the pair of clamp bands, and a pin hole for the mounting lug of each support. Two support rods, one end of which is attached and the other end of which is attached to a fixed portion, are provided.

The pipe support device according to the second aspect of the present invention is provided with a pair of half-clamps symmetrically divided in a plane including the elbow of the pipe and surrounding the elbow from both sides, and a pin provided on each clamp. One end is attached to the support mounting lug that is located on the line perpendicular to the plane containing the elbow and the pin hole of the mounting lug of each support, and the other end It is characterized by comprising two support rods attached to the fixed portion.

The pipe supporting apparatus according to the third invention of the present application is characterized in that a load meter for detecting a reaction force of the piping is provided on the support rod of the pipe supporting apparatus of the first and second inventions.

In the pipe supporting apparatus according to the fourth aspect of the present invention, the pipe supporting apparatus according to the third aspect is provided with a pipe reaction force monitoring device for issuing an alarm when the detection signal from the load meter exceeds a set value. It is characterized by that.

[0026]

According to the pipe supporting apparatus of the first invention of the present application, the pin hole of the mounting lug of the support rod is located on the plane including the pipe center orthogonal to the direction of thermal displacement of the pipe to be restrained. Even if the pipe expands in the radial direction due to the temperature rise of the pipe, the position supporting the pipe does not change.

The connecting portion of the pair of clamp bands of the pipe support device is located in the direction orthogonal to the restraining direction of the pipe, and there is no gap between the clamp band and the pipe for restraining thermal displacement of the pipe. Therefore, the radial expansion of the pipe due to heat can be absorbed, and the center position does not change due to the displacement of the pipe in the clamp band due to thermal displacement.

According to the pipe supporting apparatus of the second invention of the present application,
A pair of halves of the clamps are attached to the elbow of the pipe, and the pin holes in the support rod mounting lugs are located on a line perpendicular to the plane containing the elbow that passes through the intersection of the pipe centerlines that intersect at the elbow. The load of the pipe reaction force is directly supported by the support rod in the direction of its action, and no moment is generated.

Further, since the support rod supports the pipe at the intersection of the elbow pipe center lines, it is not affected by the thermal expansion of the pipe in the radial direction.

According to the pipe supporting apparatus of the third invention of the present application, since a load meter for detecting the compressive force or the tensile force is provided on the support rod of the above-mentioned pipe supporting apparatus, this load meter allows the radial direction of the pipe to be measured. It is possible to monitor the reaction force of the pipe by eliminating the influence of thermal expansion.

The pipe supporting apparatus according to the fourth aspect of the present invention further comprises a pipe reaction force monitoring apparatus for issuing an alarm when the detection signal from the load cell exceeds a set value, in addition to the pipe supporting apparatus according to the third aspect. Therefore, when an excessive reaction force is applied to the pipe, it is possible to automatically notify the operator of the abnormality.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the first invention of the present application.
In the figure, reference numeral 1 indicates a pipe to be supported.
A pair of halved clamp bands 2A and 2B are fitted to the outer side of the. The clamp bands 2A and 2B have a direction Y- which is orthogonal to the direction XX 'of thermal displacement of the pipe to be restrained.
It is arranged so as to be divided into two Y '. Both ends of the clamp bands 2A and 2B are connected by bolts 4 to hold the pipe 1 therebetween.

The inner radius of curvature of each clamp band 2A, 2B is set to be larger than the outer radius of curvature of the pipe 1, and the pipe 1 and the clamp bands 2A, 2B in a predetermined range in the YY 'direction. A gap G is formed between them.

As shown in FIG. 1, support mounting lugs 5 are provided on both ends of the one clamp band 2A. The pin hole 8 provided in each of the mounting lugs 5 is located on the dividing line of the clamp bands 2A and 2B, that is, on the line including the axis O of the pipe 1 and orthogonal to the direction of thermal displacement of the pipe to be restrained. is doing.

As shown in FIG. 1, the tip end portions of two support rods 3 are pivotally attached to the respective pin holes 8, and the base end portions of the respective support rods 3 are interposed by clevis 6. Attached to the wall 7 respectively.

Although not shown in FIG. 1, the heat insulating material of the pipe 1 is provided on the outer circumference of the clamp bands 2A and 2B within a range not covering the pin holes of the mounting lug 5.

Next, the operation of the pipe supporting apparatus of the present embodiment will be described based on the above-mentioned structure. When the pipe 1 is thermally deformed (displacement such that the axis O moves due to heat), the XX ′ direction component of the thermal displacement is the clamp band 2
It is restrained by A and 2B and the support rod 3. The reaction force of the pipe against the restraint is the clamp band 2A, 2
It is transmitted to the wall 7 via B, the mounting lug 5, the support rod 3, and the clevis 6.

In this case, since the pipe 1 is at a high temperature, the pipe 1 thermally expands in the radial direction, and the mounting lug 5 also extends in the lengthwise direction due to the heat. However, in the pipe supporting apparatus of this embodiment, since the pin hole 8 is located on the straight line in the YY 'direction including the axis O of the pipe, thermal deformation of the pipe 1 and the mounting lug 5 is caused by both pin holes. Since it occurs on both sides of the straight line connecting 8 as a center, the axial center O of the pipe does not move due to this thermal deformation.

Since the support mounting lug 5 is provided only on one of the clamp bands 2A or 2B, the above operation is not affected even if the clamp bands 2A and 2B are relatively displaced. .

In this embodiment, the thermal expansion of the pipe 1 itself in the radial direction is absorbed by the gap G between the pipe 1 and the clamp bands 2A and 2B in the predetermined range in the YY 'direction, and the circumference of the pipe is reduced. The thermal stress in the direction does not increase excessively.

In the above pipe supporting apparatus, a load meter can be provided on the support rod 3 as shown in FIG.

In FIG. 2, the same parts as those in FIG. 1 are designated by the same reference numerals. The pipe support device includes a load meter 9 on each support rod 3. The load meter 9 can detect the reaction force of the pipe when the pipe supporting device restrains the thermal displacement of the pipe.

According to this pipe support device, the plant operator can know from the measured value of the load meter 9 whether or not the pipe reaction force is within the respective allowable ranges of the pipe, the equipment and the pipe support device. .

FIG. 3 shows a load measuring device of the pipe supporting device shown in FIG. 2 to which a pipe reaction force monitoring / warning device is further added. In FIG. 3 in which the same reference numerals are given to the same parts in FIG. 2, the pipe support device has a load meter 9 on the support rod 3, and the load meter 9 is connected to the pipe reaction force monitoring device 10 so that signals can be transmitted. . The pipe reaction force monitoring device 10 is an alarm device 1.
1 is connected so that a signal can be output.

In this pipe support device, the value of the allowable reaction force in the load meter 9 calculated in advance from the allowable load of the nozzle of the vertical pump 20 is input to the pipe reaction force monitoring device 10. The pipe reaction force monitoring device 10 constantly inputs the measurement value signal of the load cell 9 and outputs an alarm signal to the alarm device 11 when the measurement value exceeds the value of the allowable reaction force. This allows the plant operator to know the abnormality without constantly monitoring the measurement value of the load cell 9.

FIG. 4 shows an embodiment of a pipe supporting device according to the second invention of the present application. In FIG. 4, the pipe 1 rises vertically from a horizontal portion via an elbow 21, and its upper end is connected to a suction side nozzle 22 of a vertical pump 20.

On the outside of the elbow 21, a pair of half-divided clamps 12 symmetrically divided in a plane including the elbow 21 are attached (only one side is shown). Each clamp 12 is provided with a support mounting lug 15, respectively. Pin hole 18 of mounting lug 15 of each of these supports
Is located on a line perpendicular to the plane including the elbow 21, passing through the intersection O ′ of the pipe center lines intersecting at the elbow 21.

Each pin hole 18 has two holes, as shown in FIG.
The tips of the book support rods 3 are pivotally attached to each other. The support rods 3 are arranged in parallel with the horizontal portion of the pipe 1, and the base ends of the support rods 3 are attached to the walls 7 via the clevis 6.

In the above structure, when the pipe reaction force P is generated in the direction shown in the figure due to the thermal deformation, the load is reduced by the elbow 2
1, transmitted to the wall 7 via the clamp 12, the mounting lug 15, the support rod 3 and the clevis 6. In this case, since both pin holes 18 are located on the perpendicular of the plane including the elbow passing through the intersection O ′ of the center line of the pipe 1, and the support rod 3 is provided in parallel with the line of action of the pipe reaction force P, The pipe reaction force P is canceled by the tensile force of the support rod 3. Therefore, the position of the intersection O ′ does not move,
As a result, no bending moment is generated in the nozzle 22 of the vertical pump.

Since the pin hole 18 is aligned with the intersection O'of the pipe center line on the plane including the elbow 21, the axial center of the pipe is moved by the thermal expansion of the pipe 1 in the radial direction. Nor.

[0051]

As described above, in the pipe supporting apparatus according to the first invention of the present application, on the plane including the pipe center orthogonal to the direction of thermal displacement of the pipe to be restrained by the pin hole of the mounting lug of the support rod. Since it is located at, even if the pipe expands in the radial direction due to the temperature rise of the pipe, the position for supporting the pipe does not change.

Further, the clamp band of the pipe support device is divided into two parts in a plane orthogonal to the restraining direction of the pipe, and the clamp band and the pipe are in close contact with each other in a predetermined range in the direction of thermal displacement to be restrained, while the restraint is made. Since a gap is formed between the clamp band and the pipe in the vicinity of the connecting part that is orthogonal to the thermal displacement to be made, it is possible to absorb the radial expansion due to the heat of the pipe, and in the direction of the thermal displacement to be restrained. Can fix the pipe.

Thus, it is possible to obtain a pipe support device which can eliminate the influence of thermal deformation of the pipe in the radial direction due to heat and can reliably restrain the thermal displacement of the pipe.

In the pipe supporting apparatus according to the second invention of the present application, the pin hole for mounting the support rod is located on a line including the intersection of the pipe center lines of the elbow and perpendicular to the plane including the elbow, and Since the support rod is arranged parallel to the line of action of the pipe reaction force, it is possible to prevent the pipe reaction force from being balanced with the axial force of the support rod and transmitting the moment to the nozzle of the connected device via the elbow.

Further, since the pin hole of the lug to which the support is attached is located on the plane orthogonal to the constraining displacement direction including the intersection of the pipe centerlines of the elbow, the influence of thermal expansion in the radial direction of the pipe is eliminated. It is possible to obtain a pipe support device.

Further, according to the above-mentioned pipe support device in which the load rod and the pipe reaction force monitoring / alarm device are provided on the support rod, the reaction force due to the thermal displacement of the pipe can be accurately grasped, and thus the highly reliable reaction force can be obtained. A pipe supporting device having a force monitoring function can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a pipe support device according to the first invention of the present application.

FIG. 2 is a plan view of a pipe supporting apparatus of the third invention of the present application, in which a load meter is provided on a support rod of the pipe supporting apparatus of the first invention.

FIG. 3 is a diagram showing a configuration of a pipe support device according to a fourth invention of the present application.

FIG. 4 is a diagram showing a configuration of a pipe support device according to a second invention of the present application.

FIG. 5 is a diagram showing an example of use of a conventional pipe support device.

FIG. 6 is a plan view showing one of the conventional pipe support devices.

FIG. 7 is a plan view showing another conventional pipe support device.

[Explanation of symbols]

 1 Piping 2A Clamp Band 2B Clamp Band 3 Support Rod 9 Load Cell 10 Piping Reaction Force Monitoring Device 11 Alarm 12 Clamp G Gap

Claims (4)

[Claims] 1. A pair of clamp bands, which are divided into two in a direction orthogonal to the displacement direction of the constrained pipe and surround the pipe from both sides, and a pin provided at each end of one clamp band. A support mounting lug having a hole located on the dividing line of the pair of clamp bands; and two support rods each having one end attached to a pin hole of the support mounting lug and the other end attached to a fixed portion. A pipe support device comprising: 2. A pair of half-divided clamps that are symmetrically divided in two in a plane including the elbow of the pipe and surround the elbow from both sides, and a pipe center line provided in each clamp and having pin holes intersecting with the elbow. The mounting lugs of the support located on the line perpendicular to the plane including the elbow through the intersection of, and two supports, one end of which is attached to the pin hole of the mounting lug of each support and the other end of which is attached to the fixed part. A pipe support device comprising: a rod. 3. The pipe support apparatus according to claim 1, wherein the support rod includes a load meter that detects a reaction force of the pipe. 4. The pipe support device according to claim 3, further comprising a pipe reaction force monitoring device that issues an alarm when a detection signal from the load meter exceeds a set value.