KR820000501B1 - Impact energy absorbing pipe restraints - Google Patents

Abstract

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Description

Shock Absorption Pipe Bondage Device

FIG. 1 is a partial cross-sectional view of the line 1-1 of FIG. 2 showing the present invention, the pipe bondage device for absorbing impact energy,

2 is a side view of the first degree bondage device,

3 is a front view of an example of the multi-directional pipe bondage device according to the present invention,

4 is a side view of the device of FIG. 3,

5 is a front view of another example of the present invention multi-directional pipe bondage device,

6 is a side view of the FIG. 5 apparatus.

The present invention relates to a device for the rupture of a ruptured pipe. More specifically, the present invention relates to a binding device capable of absorbing the impact energy generated when a ruptured pipe moves at least in one direction by inelastic or plastic deformation. The present invention relates generally to devices suitable for use in high energy pipes for transporting high pressure liquids such as water vapor at high temperatures.

In the past, various devices have been known for constraining ruptured pipe movement. As one of them, conventionally, an attempt has been made to restrain the ruptured pipe moving by using a honeycomb plate, and when the ruptured pipe protrudes and collides with the honeycomb plate, the pipe breaks and absorbs the impact energy. . While it was true that such known devices performed nearly satisfactory bondage functions, these known devices were inadequate to constrain protruding in different directions when a pipe ruptured, and it was difficult to construct such plates. It was expensive and costly.

As another well-known example, a saddle-shaped member is installed under a high energy pipe to prevent it from popping out in various directions when the pipe is ruptured, and an arch-shaped member is attached to surround the pipe. A member was installed on a honeycomb member and attached to concrete or steel by means of a special bolt. Thus, when the high-energy pipe ruptures, the bolt deforms to absorb high energy when exerting an impact in the upward or transverse direction, and when the impact is applied while moving downward or transversely, the honeycomb plate causes plastic deformation. It was intended to absorb high energy. However, this known decision had to allow the upward force to be absorbed by the specially machined bolts, and the downward force to be absorbed by the honeycomb plate formed entirely in a special way connected to the complex steel structure. There was a closure that cost a lot of money.

In addition, there have been various pipe restraints, which use one or more of the above-described known restraints. Another example is the use of a number of u-shaped rods attached to a u-shaped link adjacent to a pipe as a recent pipe restraint.

U.S. Patent No. 3,923,292 to Madden Jr. is another form of energy absorber, especially for use in safety bumpers in automobile bumpers, aircraft gears, auto stearing columg and elevators. The hollow spheres are used to allow the spheres to absorb energy while causing plastic deformation when an object is impacted.

It is an object of the present invention to obtain an improved impact energy absorbing pipe restraint device which can suppress a high energy pipe in any direction as it ruptures.

Another objective is to be less expensive, to minimize the load on the bondage attachment member, and to minimize the satisfaction effect (which contributes little to energy absorption and does not reduce the allowed strain).

Another object of the present invention is to obtain an improved impact energy absorption pipe which can be easily applied to high energy pipes having various different energy levels.

Another object is to provide an improved energy absorbing pipe which can reduce the transverse vibrations when the pipe is destroyed.

The device of the present invention is simply composed of a fixing member for fixing a band and a band made of a laminated plate to a support. The belt of the present invention is made of a material that can elongate a lot in a plastic state in order to be able to absorb impact energy in at least one direction when a high energy pipe is ruptured. An arch was formed to surround at least a portion of the outer circumference of the pipe so that the pipe could be ruptured and restrained when moving toward the arch.

As used herein, the term "band made of laminated board" refers to a band composed of a plurality of overlapping objects that are fixed to a certain board or block, but not laminated to each other.

Another example of the impact energy absorbing pipe suppression apparatus according to the present invention is installed across one bond or suppression pipe adjacent to the high energy pipe, so that the above-mentioned bond pipe is subjected to the impact of the ruptured high energy pipe. It is intended to help limit the transverse movement of the ruptured high-energy pipes by absorbing energy as they are plastically deformed and collapsed.

When the present invention is described in detail by the accompanying drawings as follows.

In FIG. 1, an example of the pipe-bonding device for absorbing impact energy of the present invention is generally indicated by reference numeral 10, and 12 is a high energy pipe. The high energy pipe 12 usually consists of a concentric outer insulation outer cover 14 and an inner tube 16 made of stainless steel, which carries high energy fluid through the plate 16. However, you can choose not to use Caba 14 if necessary. This pipe restraint 10 is particularly useful for absorbing the impact energy of high energy pipes carrying high pressure fluids used in nuclear power plants.

The pipe restraint device 10 includes a strip of laminated sheet material composed of a plurality of objects made of a good insulating material having a large elongation in a sintered state, such as annealing stainless steel, which will be known as 304 type. The use of the above-mentioned properties as the material of the laminated sheet material is a critical requirement for the band 17 of the laminated sheet to have the necessary energy absorption capacity. Moreover, since the band 17 is made of a plurality of thin plates, which are separate from each other, the energy absorption capacity of the band can be greatly increased. This is because the plastic deformation of the band 17 proceeds under the action (tensile) of the thin film state and completely eliminates the curved deformation.

The individual laminates of strip 17 are molded, for example, u-shaped, as shown in FIG. 1, and then fastened to the support clamps, and ends 16 and 18 are tangent stainless arc welders in pairs of plates or blocks 20 and 22, respectively. Stick in the same way. Thus, how many individual laminates will be used, and how wide will they be, depends on how much impact energy will be absorbed. However, preferably, the band 17 is manufactured using about 2-100 thin layers, and the width is preferably 0.5-15 inches.

Plates 20 and 22 are also preferably made of annealing pin 304 type stainless steel, which drills pin (or bolt) holes 24 and 26, respectively. Pins 28 and 30 are inserted into the holes 24 and 26, with the ends of pins 28 and 30 pivotally attached to a pair of rectangular links 32 and 34. In links 32 and 34, holes 33A and 3, 35A and B were drilled to allow pins 28 and 30 to pivotally fit, respectively. If necessary, a plate may be attached to the link and reinforced.

Retainer rings 44A and B and 46A and B are mounted near the ends of pins 28 and 30 to protrude outward from links 32 and 34 to prevent pins 28 and 30 from exiting links 32 and 34. Alternatively, bolts (not shown) to be screwed onto the pair of nuts may be used instead of pins 28 and 30, retainer rings 44A and B, and 46A and B.

Before installing the pins 28 and 30, it is desirable to first set the links 32 and 34 to the support 48.

In the case of up to about 12 pins in diameter, it is preferable in the restraint device to insert spherical bearings 40 and 42 into holes 24 and 26 and install them on pins 28 and 30, but this method is not very desirable when the diameter is larger than this. The use of spherical bearings in this way results in a smoother turning movement perpendicular to the axes of pins 28 and 30 of the blocks 20 and 22.

Thus, when using spherical bearings, it is preferable to use bushings 36A and 36B and 38A and B in order to center the centers of plates 20 and 22 on pins 98 and 30 with respect to the sidewalls on links 32 and 34. It is possible to prevent the plates 20 and 22 from moving along the pins 28 and 30 in the 34 direction. One end of the bushings 36A and 36B leans against the inner wall of the link 32 and the other end leans against the spherical bearing 40.

In this way, the bushings 38A and 38B lean against the inner wall of the link 34 and the other end against the spherical bearing 42.

In another example, the links 32 and 34 are rotated 90 degrees so that the axes of pins 28 and 30 through the holes in the links are parallel to the axes of pipe 12. In this case, the holes 24 and 26 in the blocks 20 and 22 are rotated by 90 ° as compared to the above-described example of the present invention.

In contrast to the conventional wide arch shape, in the present invention, in addition to the narrow band 17, in the inclined direction when the blast furnace pipe using self-balanced turning pins 28 and 30 is ruptured. By applying an impact, the differential deformation in the width of the band caused by the first contact with the inner end of the high energy pipe 12 and the band 17 of the multilayer board can be minimized. In addition, as described above, since a band is formed using a plurality of plates, the bending effect of absorbing the impact energy by thin film action (tensile) to reduce the allowable strain can be minimized.

As shown in FIG. 1, the band 17 of the laminated sheet material is a u-shaped member having an arch portion 49, 80 is its government, and 82 and 84 are the leg portions. The arch is for restraining or restraining pipe 12 when it ruptures and moves in the direction of the arrow. By arranging the band 17 as shown and making it pivotable about the links 32 and 34, it is possible that the pipe 12 is not ruptured but does not unduly limit its positional shift by heat and vibration. Moreover, the strip of the present invention is flexible to allow the normal movement of pipe 12 even when the strip 17 and pipe 12 are in close contact. Moreover, the thin sides of the strip of the present invention are flexible so that they can maintain a close contact between the strip 17 and the pipe 12, and do not impose an unreasonable limitation on the normal pipe movement. This close spacing reduces the distance traveled by the ruptured pipe prior to reshaping, thus reducing the force on the support 48 to which the reshaping device is attached. Although determined by the shape and size of the piping system, the stacking of the top 80 of the band 18 and the cover 14 of the pipe 12 is approximately 4 inches, as determined by the shape and size of the piping system, and the legs 82 and 84 of the band 17 and the cover of the pipe 12. The shortest distance with 14 was found to be practically about 1/16 inch to 1/2 inch.

Arch portion 49 may be arranged to re-deform the movement of high energy 12 in any direction, or use more than one band 17 to achieve multidirectional bondage (see FIGS. 3 and 4). In addition, the ends 16 and 18 of 17 may be attached to separate boards laid in two links, as shown in FIGS. 1 and 2. However, ends 16 and 18 can also be attached to a single plate laid in a single link, if desired.

The end of the band was found to be particularly advantageous to weld to plates 20 and 22. To achieve this goal, ends 16 and 18 of the band 17 went down and slightly wider than the torso of the band 17. This forms welds 37 and 39 with sufficient force between the ends 16 and 18 and the plates 20 and 22 so that the two parts are not broken and the welds 37 and 39 are elastic or only plastically deformed. To make it possible. The inventors have found that such a condition is achieved when the width of the ends 16 and 18 of the band 17 is 1.5 times the body portion of the band 17. Hence, upon impact, not only the entire band 17 deforms plastically, but also the welds 37 and 39 also deform slightly plastically. Since most of the welding parts 37 and 39 and the pivotally fixed parts are in an elastic state, there is an advantage that the quality control of the fixing member does not need to be strictly carried out as when the fixing member is firmly fixed to the band 17.

In FIGS. 3, 4, 5, and 6, the same parts are denoted by the same numerals, but in these drawings, characters are combined and not indicated by only numbers. In FIG. 1 and FIG. 2, 10 is shown as 10A, 10B, and 10C in FIGS. 3, 4, 5, and 6, respectively.

Referring to FIG. 3, a pair of pipe restraints 10A and 10B of the type shown in FIGS. 1 and 2 are used together with the bond pipe 50 to enable multidirectional bondage. Pipe restraints 10A and 10B have arches shown as 49A and 49B, respectively, and these bands 17A and 17B are installed at an angle of about 45 ° to the axis of the high-energy pipe 52 and the opposite side so that the pipe ruptures. When the high energy pipe 52 is bound up or in the transverse direction, the binding pipe 50 is located below the high energy pipe 52, so that the pipe moves downward when it is ruptured. Therefore, in this case, it will be appreciated that multidirectional bondage can be obtained.

Ends 16A, 18A and 16B and 18B of bands 17A and 17B were elastically fixed to links 32A and 34A and 32B and 34B as shown in FIG. Preferably, however, the links 32A and 34A and 32B and 34B are welded to the bases 53 and 54, respectively, and a base support plate 55 is formed to bolt to the plate 56 embedded in the concrete floor or to the wall if necessary. You can also weld. In addition, links 32A and 34A and 32B and 34B can be flanged (not shown) and screwed directly to the concrete floor using bolts. A shim 59 can be inserted under the base support 55 to adjust the positions of the bands 17A and 17B and the constrained pipe 50 relative to the high energy pipe 52.

As shown in FIGS. 3 and 4, the two bands and the constrained pipe 50 allow for proper confinement of the pipe in a 360 ° direction around the high energy pipe 52. However, if necessary, multidirectional bondage can also be achieved using bands alone.

However, in order to obtain multidirectional bondage, it has been found to be particularly advantageous to use the pipe 50 for the bondage to absorb the energy generated when the pipe 52 ruptures and moves downward when it is ruptured. Moreover, if necessary, only the constrained pipe 50 may be used alone or in combination with other pipe chips to allow the ruptured high energy pipe to be constrained in any direction. In either case, however, they are particularly useful for suppressing downward movement of pipe 52.

Bondage pipe 50 has one or more straight or curved sections of carbon steel or stainless steel, and is approximately 1.5-36 inches in diameter, depending on the high energy pipe 52 and its energy level. About 0.5-5 inches from the base. The ends 62 and 64 are not attached to the binding pipe 50 anywhere, and the binding pipe 50 is hollow so that the impact energy of the high energy pipe 52 is absorbed as the binding pipe 50 collapses.

In order to minimize deformation in the high energy pipe 52 and allow energy absorption to occur mainly in the bond pipe 50, the wall thickness of the bond pipe should be less than about 90% of the wall thickness of the high energy pipe. The inventors' findings helped to minimize deformation in the high energy pipe 52 by appropriately selecting the ratio of the pipe diameters and helped to absorb the energy mainly in the constrained pipe 50. The diameter ratio of the high energy pipe 52 to the diameter of the binding pipe 50 is preferably about 3: 1 to 1: 3. For example, when using a bond pipe longer than 20 inches (10 inches wall thickness 0.593 inches), a high energy pipe with a diameter of 3.3-30 inches wall thickness 0.659 inches can be bound.

The constrained pipe 50 is secured to the support member at intermediate points at the ends 62 and 64 using U-shaped bolts 68 and 70 as indicated in FIG. 4 so that these ends can be freely raised.

In addition, it may be fixed in one or several places by through bolts or welding. The support member 66 is attached to the support plate 55 by welding and bolted to the buried plate 56.

With this arrangement, when the high energy pipe 52 is impacted, the end portions 62 and 64 described above are squeezed by the blast furnace constriction pipe 50, which is moved about 5-30 ° above the longitudinal axis of the constriction pipe 50. The U-well 72 can partially enclose the ruptured high energy pipe 55, as indicated by the dotted lines in it, to help prevent the ruptured pipe from moving laterally.

5 shows a multidirectional pipe restraint in another form. The use of a single pipe restraint 17C with a band 17C for constraining upward movement in combination with a pair of bondage pipes 50A and B with ends 62A and 62B cut perpendicular to the axis. The right angle bond pipes 50A and 50B are installed under the high energy pipe 52 along the horizontal axis to form a V-shape to bond the transverse or downward movement to the ruptured high energy pipe 52. The band was connected to the links 32C and 34C as described in FIG. 1 and the links 32C and 34C were formed integrally with the support plate 55A. As shown in FIG. 6, the pipes 50A and 50B were connected to the support members 74 and 76 by the U-shaped bolts 68A and 70A and 68B and 70B or other methods described above. The support plate 55A is bolted to a landfill plate 56A embedded in the bottom of the concrete, and it is advantageous to adjust the position of the band 17C for the high energy pipe 52 and the restraint pipes 50A and 50B by fitting the shim 58A under the base.

Claims (1)

As detailed above and shown in the figures, the transverse longitudinal axis of the high energy pipe is positioned adjacent to the high energy pipe and absorbs the impact energy of the ruptured high energy pipe and constrains its movement when the bond pipe collides and collapses. Absorbs and moves the impact energy of the ruptured high-energy pipe, which consists of a constrained pipe, a support device adjacent to the high energy pipe, and a connection device connecting the constrained pipe to the support device. A pipe restraint that binds the body in at least one direction.

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