US20030230214A1 - Coil car structure - Google Patents
Coil car structure Download PDFInfo
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- US20030230214A1 US20030230214A1 US10/409,640 US40964003A US2003230214A1 US 20030230214 A1 US20030230214 A1 US 20030230214A1 US 40964003 A US40964003 A US 40964003A US 2003230214 A1 US2003230214 A1 US 2003230214A1
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- rail car
- cross
- side beams
- trucks
- car
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D45/00—Means or devices for securing or supporting the cargo, including protection against shocks
- B61D45/001—Devices for fixing to walls or floors
- B61D45/003—Fixing of logs, beams, barrels, pipes, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
- B61D3/00—Wagons or vans
- B61D3/16—Wagons or vans adapted for carrying special loads
Definitions
- This invention relates to improvements in the structure railway cars for carrying metal coils, commonly referred to as coil cars.
- Coils of steel sheet are often carried by rail cars. Coils can be mounted either longitudinally or transversely. In a longitudinal mounting, the axis of revolution of the coil is aligned to be substantially parallel with the rolling, or longitudinal, direction of the rail car. A longitudinal mounting often has the appearance of a single long trough with a number of moveable intermediate dividers. In a transverse mounting, the axis of revolution of the coil is aligned across the tracks, that is, perpendicular to the rolling direction of the rail car. Transverse mounting cars have a number of parallel bunks, rather than one long trough. A bunk is generally V-shaped, and the coil sits in the bunk with the outer circumference of the coil tangent to the V at two points such that it cannot roll. The V-shaped bunks are generally lined with wood decking to act as cushioning, thereby discouraging damage to the coils during loading or travel.
- the basic structure of a flat car includes a main center sill that is box shaped in cross-section.
- the center sill of this kind of car is the main structural member of the car and runs from one end coupling of the car to the other.
- the center sill is the primary load path of the car both for longitudinal buff and draft loads from coupler to coupler, and for carrying the vertical load bending moment between the trucks.
- a wide deck is mounted above the center sill of this kind of car.
- alternating cross-bearers and cross ties extend outwardly from the central sill.
- the cross bearers tend to be of deeper section and provide the majority of the support for the outboard regions of the deck.
- the flat car design has evolved to have stronger and bigger main sills, sometimes reinforced by doubled sections.
- the central sill may not necessarily be of constant section, but may have a “fish belly” profile. That is, the depth of section of the centre sill can increase toward the mid-section of the railcar to correspond to the increase in bending moment at mid-span between the rail car trucks.
- longitudinal stringers, in the form of I-beams or wide flange beams have been located above the deck level to form the upper lip of the longitudinal bunk.
- some or all of the flat decking can be replaced by canted decking to form the V-shaped trough.
- the present inventor has taken a different approach. Rather than having a dominant center sill, the inventor employ a pair of outboard beams of relatively deep section. The coil carrying bunk is then supported at its lateral ends to extend between the two deep side beams, A car with a pair of deep beams, well separated also has superior lateral bending resistance to a narrower car.
- the stiffeners present a flat surface, in the same plane as the plane of the web of the cross-bearer, against which a lap joint can be formed. Not only can a better joint be formed, but the fit-up process in manufacturing is, in the view of the present inventor, easier. That is, the pre-existing vertical stiffener of the beam acts as a longitudinal stop for the outboard tip of the cross-bearer, automatically locating it in the correct position.
- the present invention provides, in a first aspect, a rail car for carrying metal coils, comprising a pair of end structures each mounted on a rail car truck, a pair of side beams extending between the end structures, and a transverse cradle, for cradling metal coils, mounted between the side beams.
- the cradle has a longitudinally extending low central portion. The lowest point of the low central portion lies at a height that is at least as high as the lowest extremity of the side beams.
- the railcar has, at a transverse-section between said trucks, a second moment of area about a horizontal neutral axis, and the side beams contribute at least half of the second moment of area of the section.
- the side beams of the rail car contribute at least three quarters of the second moment of area of the section.
- the side beams of the railcar contribute at least 90% of the second moment of area.
- the location of maximum longitudinal compressive stress under a gravity load is in the highest chord of one of the side beams.
- the cradle has a center sill extending longitudinally along the low central portion.
- the central sill has a top flange and a bottom flange
- the rail car has, at a transverse section between the trucks, a neutral axis for bending under gravity loads, and the neutral axis lies at a height that is between the height of the top and bottom flanges.
- the cradle includes cross-bearers connected to the side beams.
- the cross bearers are of substantially uniform design.
- at least a medial portion of the rail car between the trucks is of the type chosen from the set of rail car types consisting of rail car portions that are free of cross-ties and rail car portions in which the number of cross ties is fewer than two thirds as many as cross bearers.
- the rail car has a through centre sill of substantially constant cross-section.
- the cross-bearers are of substantially uniform design.
- at least the medial portion of the rail car is of a type chosen from the set consisting of types that are free of cross-ties, and types that have less than two-thirds as many cross-ties as cross-bearers.
- a rail car for carrying metal coils comprising a pair of end structures each mounted on a rail car truck, a pair of side beams extending between the end structures, a transverse sling, for cradling metal coils, slung between the side beams, the rail car having a set of brakes, and at least one of the side beams having a relief permitting access to the brakes.
- the relief is located adjacent the truck.
- the one beam has a relief adjacent each of the trucks.
- both the beams have reliefs adjacent the trucks.
- FIG. 1 is a top view of a prior art coil car.
- FIG. 2 is a side view of the prior art coil car of FIG. 1.
- FIG. 3 a is a cross-sectional view on section ‘ 3 a - 3 a ’ of the prior art coil car of FIG. 1.
- FIG. 3 b is the other cross-sectional view on section ‘ 3 b - 3 b ’ of FIG. 1.
- FIG. 4 is a sectional view on section ‘ 4 - 4 ’ of the prior art coil car of FIG. 1.
- FIG. 5 a is top view a rail car according to the present invention.
- FIG. 5 b is a top view of the rail car of FIG. 5 a with decking removed to show the skeletal structure of the rail car.
- FIG. 6 is a side view of half of the rail car of FIGS. 5 a and 5 b.
- FIG. 7 is a cross section of the rail car of FIGS. 5 a and 5 b at mid span.
- FIG. 8 a is a cross section of the rail car of FIG. 5 a at the main bolster.
- FIG. 8 b is a cross sectional view of the rail car of FIG. 5 b toward the end bulkhead.
- FIGS. 1, 2, 3 a , 3 b and 4 The prior art rail car is indicated generally in FIGS. 1, 2, 3 a , 3 b and 4 as P 20 . It has a pair of rail car end structures P 22 and P 24 , each having a main bolster P 26 , A main center sill is indicated as P 28 . Ribs branch outwardly from main center sill P 28 and are indicated as cross-bearers P 30 and thinner cross-ties P 32 . The outer tips of cross-bearers P 30 and cross ties P 32 meet with one or other of a pair of wide flange beams P 34 and P 36 .
- a generally V-shaped deck P 38 runs the length of the car, spanning the pitches between cross-beams P 30 and cross-ties P 32 to terminate at end bulkheads P 40 and P 42 .
- Main center sill P 28 has a generally box-shaped rectangular section that has a deep central belly P 44 , shown in FIGS. 3 a and 3 b .
- Main center sill P 28 has an upper flange P 46 and a thick central lower flange P 48 .
- main center sill P 28 at central belly P 44 is 28 inches.
- the weight of main center sill P 28 is 150 lbs per lineal foot, and its width is 22 inches over the lower flange P 48 .
- the thickness of bottom flange P 48 is 1 inch and the thickness or the remainder of main center sill P 28 is 3 ⁇ 8 inches thick.
- Wide flange beams P 34 and P 36 are 13.8 inches deep at 34.3 lbs. per lineal foot each.
- the overall weight of section is roughly 261 lbs. per lineal foot with a neutral axis in bending located 22.9 inches above top of rail, undeflected design height.
- the local neutral axis of main center sill P 28 is located about 23.3 inches TOR, and the local neutral axis of each of the wide flange beams is located about 56.8 inches above TOR.
- the second moment of area of the section shown in FIG. 3 a is about 24,300 in 4 . Of this, 50% can be attributed to the influence of main center sill P 28 .
- wide flange P 36 has been trimmed locally to admit the distal tip P 50 of cross-bearer P 30 , such that the end of the tapered web P 52 and upper flange P 54 of cross-bearer P 30 abut the vertical web of wide flange beam P 36 .
- Cross beam P 30 and wide flange P 36 are fillet welded together in this orientation.
- FIG. 3 b A similar arrangement is shown in FIG. 3 b for cross-tie P 32 and wide flange P 34 .
- FIG. 5 a an example of a rail car embodying the present invention is illustrated S in FIG. 5 a .
- the major structural elements are both symmetrical about the longitudinal centerline of the car (as designated by axis CL) and symmetrical about the mid-span transverse section of the car, indicated as TS.
- axis CL longitudinal centerline
- TS mid-span transverse section of the car
- a rail car is indicated generally as 20 . It has a pair of end structures 22 and 24 for mounting on a pair of rail car trucks 26 and 28 respectively.
- a pair of left and right hand side beams 30 and 32 extend between end structures 22 and 24 , and form the main longitudinal structural elements of rail car 20 for resisting gravitational loads.
- a cradle 34 is hung between beams 30 and 32 .
- Cradle 34 resembles a trough, and is shaped to cradle steel coils, or other similar loads, between its inwardly and downwardly sloping shoulders 36 .
- Shoulders 36 are lined with wooden decking 37 placed to accommodate coils ranging between 30 and 84 inches in diameter. When coils are loaded in cradle 34 they are discouraged from longitudinal sliding by end bulkheads 35 and by moveable bulkheads 38 whose locating pins seat in the indexed apertures of left and right hand locating plates 39 .
- the structure of cradle 34 includes a center sill, 40 , cross-bearers 42 extending between center sill 40 and one or the other of side beams 30 and 32 , and deck plates 44 .
- Deck plates 44 include right and left hand slope plates 46 , and 48 of shoulders 36 , welded to the upper flanges of cross-bearers 42 and to the upper flange 50 of center sill 40 .
- Center sill 40 includes, in addition to upper flange 50 , a pair of parallel vertical webs 52 and 54 and a lower flange 56 .
- Center sill 40 is a through-center-sill, that is, it runs from one end of rail car 20 to the other, and is of substantially constant section throughout its length.
- Center sill 40 has an overall depth of 12.719 inches.
- Upper flange 50 is 15 inches wide and 0.50 inches thick.
- Lower flange 56 is 16 inches wide and 0.50 inches thick.
- Vertical webs 52 and 54 are each 11.719 inches high and 0.375 inches thick.
- the overall weight of the section is 82.3 lbs per lineal foot, and its local moment of inertia in longitudinal bending, that is its second moment of area about its transverse neutral axis, is 664 in 4 .
- rail car 20 is symmetrical, for the purposes of the present description it will be understood that the structure of side beams 30 and 32 is identical.
- Each has an upper flange assembly 70 , a lower flange assembly 72 , and webbing 74 .
- upper flange assembly 70 has a top chord member in the nature of a hollow rectangular steel tube 76 , upon which pin locating plate 39 is mounted.
- Plate 39 has an inwardly extending perforated tongue, 80 , the perforations having a constant pitch, and being of a size and shape suitable for engagement by the locating pins of moveable bulkheads 38 .
- Lower flange assembly 72 includes a main lower sill member in the nature of a hollow rectangular tube 86 to which a 3 ⁇ 4′′ thick steel lower sill reinforcement 88 has been added.
- Webbing 74 includes a substantially vertical steel web 90 welded at lap joints to the respective outer faces of steel tube 76 and rectangular tube 86 .
- Vertical braces 92 extend between tubes 76 and 86 along the inner face of web 90 at regular spacings along the length of beams 30 and 32 .
- a cantilevered walkway 94 is mounted on brackets 98 located on the outboard face of web 90 .
- each side beam 30 or 32 Over the mid span section of car 20 , that is, the portion of car 20 at which side beams 30 and 32 have their maximum depth, the overall second moment of area of each side beam 30 or 32 is about 14,800 in 4 .
- the weight of each side beam section is about 100 lbs. per lineal foot.
- Each of side beams 30 and 32 provides just over 45% of the total second moment of area of the mid span section of car 20 .
- Deck Plate, 44 has a vertical upturned lip 102 that is welded along the inwardly facing side of steel tube 76 .
- the web 104 of cross bearer 42 extends beyond the ends of its upper and lower flanges 106 and 108 and is cut on a mitre to yield a substantial tab 110 suitable for welding in a lap joint to the longitudinally facing side 112 of vertical brace 92 .
- the joint is welded at a fillet along the corner of vertical brace 92 on one face of tab 110 , and at a fillet along the distally extreme edge of tab 110 to side 112 .
- Web 104 also has intermediate gussets 114 to provide reinforcement in the region of wooden decking 37 .
- Wooden decking 37 is provided for the known purpose of cushioning metal coils loaded in car 20 , as noted above.
- the upper portion 130 of the dog leg has an exaggerated, or extended, reach to yield a relief, or accessway, indicated generally as 132 between the near wheel 134 of truck 26 or 28 , and the truncated end of lower sill tube 86 .
- This extended recess facilitates maintenance and repair of operating mechanisms of car 20 , such as brake linkages. It also makes for a more efficient use of material since the depth of section required at mid span is generally greater than that required near the ends of the span for a simply supported beam. This permits a saving in weight.
- Main bolster 140 has the form of a laterally extending irregular box with a pair of spaced apart, substantially parallel webs 142 and 144 of significant depth. Webs 142 and 144 extend fully between a stepped lower flange and a sloped upper flange 146 underlying deck plate 36 . Webs 142 and 144 have an extending tab 148 that reaches under and supports upper flange assembly 70 , abuts the inside face of web 90 , and also abuts the top face of upswept flange 120 .
- centroid of area of car 20 is at a height just below the top of top flange 50 , within the profile of center sill 40 .
- center sill 40 plays only a small role in resistance to vertical bending.
Abstract
Description
- This invention relates to improvements in the structure railway cars for carrying metal coils, commonly referred to as coil cars.
- Coils of steel sheet are often carried by rail cars. Coils can be mounted either longitudinally or transversely. In a longitudinal mounting, the axis of revolution of the coil is aligned to be substantially parallel with the rolling, or longitudinal, direction of the rail car. A longitudinal mounting often has the appearance of a single long trough with a number of moveable intermediate dividers. In a transverse mounting, the axis of revolution of the coil is aligned across the tracks, that is, perpendicular to the rolling direction of the rail car. Transverse mounting cars have a number of parallel bunks, rather than one long trough. A bunk is generally V-shaped, and the coil sits in the bunk with the outer circumference of the coil tangent to the V at two points such that it cannot roll. The V-shaped bunks are generally lined with wood decking to act as cushioning, thereby discouraging damage to the coils during loading or travel.
- In earlier times flat cars were converted to function as coil cars by adding bunks on to the flat car deck to prevent the coils from rolling off the deck during transport from the rolling mill to the customer. The basic structure of a flat car includes a main center sill that is box shaped in cross-section. The center sill of this kind of car is the main structural member of the car and runs from one end coupling of the car to the other. The center sill is the primary load path of the car both for longitudinal buff and draft loads from coupler to coupler, and for carrying the vertical load bending moment between the trucks. A wide deck is mounted above the center sill of this kind of car. Often, alternating cross-bearers and cross ties extend outwardly from the central sill. The cross bearers tend to be of deeper section and provide the majority of the support for the outboard regions of the deck.
- Over time, the size and weight of coils that can be carried has increased. The flat car design has evolved to have stronger and bigger main sills, sometimes reinforced by doubled sections. Further, the central sill may not necessarily be of constant section, but may have a “fish belly” profile. That is, the depth of section of the centre sill can increase toward the mid-section of the railcar to correspond to the increase in bending moment at mid-span between the rail car trucks. Further, longitudinal stringers, in the form of I-beams or wide flange beams have been located above the deck level to form the upper lip of the longitudinal bunk. In another step in the evolution of the flat car design, some or all of the flat decking can be replaced by canted decking to form the V-shaped trough. In more recent times the flat decking has been removed entirely, to leave a railcar having a dominant centre sill, a pair of elevated outboard longitudinal beams, cross-bearers cantilevered out from the centre sill like ribs; and V-shaped decking to form the trough.
- The present inventor has taken a different approach. Rather than having a dominant center sill, the inventor employ a pair of outboard beams of relatively deep section. The coil carrying bunk is then supported at its lateral ends to extend between the two deep side beams, A car with a pair of deep beams, well separated also has superior lateral bending resistance to a narrower car.
- In terms of fabrication, it is advantageous to reduce the number of different parts used in an assembly. To that end, it would be advantageous to replace the traditional arrangement of alternating cross-ties and cross-bearers with a single design of cross-bearer. When the cross-bearer is designed conceptually as a cantilevered arm or rib, it is not uncommon for the root of the arm to be of a deeper section than the tip, reflecting the relatively large moment that must be carried at the root of the arm. However, a tapered section is not as convenient as a section of constant depth. A section of constant depth can be produced by a rolling mill, and is less likely to have welding defects or irregularities than a fabricated section. By contrast, when the cross-bearer is in concept more akin to a beam supported at two ends, the use of a section of constant depth is not inappropriate.
- The use of a deep side beam presents the opportunity for improving the connection at the outboard tips of the cross-bearers. Formerly, the use of I-beam or wide flange beams at the upper and outer lips of the trough did not always present a convenient welding arrangement. The cross-bearer end could be trimmed to match the profile of the I-beam web, or the flange of the I-beam could be trimmed back locally to accommodate the cross-bearer tip. In either case the cross-bearer tip would butt against the I-beam section. When deep side beams are used, the beams themselves have intermediate vertical stiffeners to discourage the relatively thin webs of the beams from buckling. At the same time, the stiffeners present a flat surface, in the same plane as the plane of the web of the cross-bearer, against which a lap joint can be formed. Not only can a better joint be formed, but the fit-up process in manufacturing is, in the view of the present inventor, easier. That is, the pre-existing vertical stiffener of the beam acts as a longitudinal stop for the outboard tip of the cross-bearer, automatically locating it in the correct position.
- Access for brake maintenance on a car with deep side walls may be limited. To address this concern the present inventor has eased the downward profile of the side beams to permit improved access to the brakes between the trucks and the mid-span portion of the car.
- The present invention provides, in a first aspect, a rail car for carrying metal coils, comprising a pair of end structures each mounted on a rail car truck, a pair of side beams extending between the end structures, and a transverse cradle, for cradling metal coils, mounted between the side beams. The cradle has a longitudinally extending low central portion. The lowest point of the low central portion lies at a height that is at least as high as the lowest extremity of the side beams.
- In an additional feature of that aspect of the invention, the railcar has, at a transverse-section between said trucks, a second moment of area about a horizontal neutral axis, and the side beams contribute at least half of the second moment of area of the section. In another additional feature of that aspect of the invention, the side beams of the rail car contribute at least three quarters of the second moment of area of the section. In a still further additional feature of that aspect of the invention, the side beams of the railcar contribute at least 90% of the second moment of area.
- In still another further additional feature of that aspect of the invention, at a transverse section between the trucks, the location of the maximum longitudinal tensile stress under a gravity load is in the lowest chord of one of the side beams.
- In yet another additional feature of that aspect of the invention, at a transverse section between the trucks, the location of maximum longitudinal compressive stress under a gravity load is in the highest chord of one of the side beams. In still another additional feature of that aspect of the invention, the cradle has a center sill extending longitudinally along the low central portion.
- In still yet another additional feature of that aspect of the invention, the central sill has a top flange and a bottom flange, the rail car has, at a transverse section between the trucks, a neutral axis for bending under gravity loads, and the neutral axis lies at a height that is between the height of the top and bottom flanges.
- In another additional feature of that aspect of the invention, the cradle includes cross-bearers connected to the side beams. In still yet another feature of that aspect of the invention, in at least a medial portion of the rail car between the trucks, the cross bearers are of substantially uniform design. In a further feature of that aspect of the invention, at least a medial portion of the rail car between the trucks is of the type chosen from the set of rail car types consisting of rail car portions that are free of cross-ties and rail car portions in which the number of cross ties is fewer than two thirds as many as cross bearers.
- In still a further additional feature of that aspect of the invention, the rail car has a through centre sill of substantially constant cross-section. In still yet a further additional feature of that aspect of the invention, over at least the medial portion of the rail car, the cross-bearers are of substantially uniform design. In another further additional feature of that aspect of the invention, at least the medial portion of the rail car is of a type chosen from the set consisting of types that are free of cross-ties, and types that have less than two-thirds as many cross-ties as cross-bearers.
- In another aspect of the invention, there is a rail car for carrying metal coils comprising a pair of end structures each mounted on a rail car truck, a pair of side beams extending between the end structures, a transverse sling, for cradling metal coils, slung between the side beams, the rail car having a set of brakes, and at least one of the side beams having a relief permitting access to the brakes.
- In an additional feature of that aspect of the invention, the relief is located adjacent the truck. In another additional feature of that aspect of the invention, the one beam has a relief adjacent each of the trucks. In still another additional feature of that aspect of the invention, both the beams have reliefs adjacent the trucks.
- For a better understanding of the present invention and to show more clearly how it may be carried into effect, reference will now be made by way of example to the accompanying drawings, which show an apparatus according to the preferred embodiment of the present invention and in which:
- FIG. 1 is a top view of a prior art coil car.
- FIG. 2 is a side view of the prior art coil car of FIG. 1.
- FIG. 3a is a cross-sectional view on section ‘3 a-3 a ’ of the prior art coil car of FIG. 1.
- FIG. 3b is the other cross-sectional view on section ‘3 b-3 b ’ of FIG. 1.
- FIG. 4 is a sectional view on section ‘4-4’ of the prior art coil car of FIG. 1.
- FIG. 5a is top view a rail car according to the present invention.
- FIG. 5b is a top view of the rail car of FIG. 5a with decking removed to show the skeletal structure of the rail car.
- FIG. 6 is a side view of half of the rail car of FIGS. 5a and 5 b.
- FIG. 7 is a cross section of the rail car of FIGS. 5a and 5 b at mid span.
- FIG. 8a is a cross section of the rail car of FIG. 5a at the main bolster.
- FIG. 8b is a cross sectional view of the rail car of FIG. 5b toward the end bulkhead.
- The description which follows, and the embodiments described therein, are provided by way of illustration of an example, or examples of particular embodiments of the principles of the present invention. These examples are provided for the purposes of explanation, and not of limitation, of those principles and of the invention. In the description which follows, like parts are marked throughout the specification and the drawings with the same respective reference numerals. The drawings are not necessarily to scale and in some instances proportions may have been exaggerated in order more clearly to depict certain features of the invention.
- For the purposes of better understanding the present invention, a number of s illustrations of a prior art rail car are included by way of comparison. The prior art rail car is indicated generally in FIGS. 1, 2,3 a, 3 b and 4 as P20. It has a pair of rail car end structures P22 and P24, each having a main bolster P26, A main center sill is indicated as P28. Ribs branch outwardly from main center sill P28 and are indicated as cross-bearers P30 and thinner cross-ties P32. The outer tips of cross-bearers P30 and cross ties P32 meet with one or other of a pair of wide flange beams P34 and P36. A generally V-shaped deck P38 runs the length of the car, spanning the pitches between cross-beams P30 and cross-ties P32 to terminate at end bulkheads P40 and P42. Main center sill P28 has a generally box-shaped rectangular section that has a deep central belly P44, shown in FIGS. 3a and 3 b. Main center sill P28 has an upper flange P46 and a thick central lower flange P48.
- In the particular embodiment illustrated the overall depth of main center sill P28 at central belly P44 is 28 inches. The weight of main center sill P28 is 150 lbs per lineal foot, and its width is 22 inches over the lower flange P48. The thickness of bottom flange P48 is 1 inch and the thickness or the remainder of main center sill P28 is ⅜ inches thick. Wide flange beams P34 and P36 are 13.8 inches deep at 34.3 lbs. per lineal foot each. The overall weight of section is roughly 261 lbs. per lineal foot with a neutral axis in bending located 22.9 inches above top of rail, undeflected design height. The local neutral axis of main center sill P28 is located about 23.3 inches TOR, and the local neutral axis of each of the wide flange beams is located about 56.8 inches above TOR. The second moment of area of the section shown in FIG. 3a is about 24,300 in4. Of this, 50% can be attributed to the influence of main center sill P28.
- At the mid-span line of car P20, it is expected conceptually that a large coil, such as an 84 inch diameter coil, will tend to place the top flange of cross bearers P30 in tension and the lower flange in compression.
- In FIG. 3a, wide flange P36 has been trimmed locally to admit the distal tip P50 of cross-bearer P30, such that the end of the tapered web P52 and upper flange P54 of cross-bearer P30 abut the vertical web of wide flange beam P36. Cross beam P30 and wide flange P36 are fillet welded together in this orientation. A similar arrangement is shown in FIG. 3b for cross-tie P32 and wide flange P34.
- By contrast, an example of a rail car embodying the present invention is illustrated S in FIG. 5a. For the purposes of conceptual explanation the embodiments illustrated in FIGS. 5a, 5 b, 6, 7, 8 a and 8 b, the major structural elements are both symmetrical about the longitudinal centerline of the car (as designated by axis CL) and symmetrical about the mid-span transverse section of the car, indicated as TS. In reality a number of secondary and tertiary brake fittings, handrails, brackets, cables and other ancillary features that do not have appreciable effect on the structural performance of the car may not necessarily be symmetrical about either centerline.
- A rail car is indicated generally as20. It has a pair of end structures 22 and 24 for mounting on a pair of rail car trucks 26 and 28 respectively. A pair of left and right hand side beams 30 and 32 extend between end structures 22 and 24, and form the main longitudinal structural elements of
rail car 20 for resisting gravitational loads. Acradle 34 is hung betweenbeams Cradle 34 resembles a trough, and is shaped to cradle steel coils, or other similar loads, between its inwardly and downwardly slopingshoulders 36.Shoulders 36 are lined withwooden decking 37 placed to accommodate coils ranging between 30 and 84 inches in diameter. When coils are loaded incradle 34 they are discouraged from longitudinal sliding byend bulkheads 35 and bymoveable bulkheads 38 whose locating pins seat in the indexed apertures of left and righthand locating plates 39. - The structure of
cradle 34 includes a center sill, 40, cross-bearers 42 extending betweencenter sill 40 and one or the other of side beams 30 and 32, anddeck plates 44.Deck plates 44 include right and lefthand slope plates shoulders 36, welded to the upper flanges ofcross-bearers 42 and to theupper flange 50 ofcenter sill 40.Center sill 40 includes, in addition toupper flange 50, a pair of parallelvertical webs lower flange 56.Center sill 40 is a through-center-sill, that is, it runs from one end ofrail car 20 to the other, and is of substantially constant section throughout its length.Internal gussets 57 are welded inside center sill 40 to provide web continuity at each cross-bearer location.Center sill 40 has an overall depth of 12.719 inches.Upper flange 50 is 15 inches wide and 0.50 inches thick.Lower flange 56 is 16 inches wide and 0.50 inches thick.Vertical webs - Since
rail car 20 is symmetrical, for the purposes of the present description it will be understood that the structure of side beams 30 and 32 is identical. Each has anupper flange assembly 70, alower flange assembly 72, andwebbing 74. Examining each of these in turn,upper flange assembly 70 has a top chord member in the nature of a hollowrectangular steel tube 76, upon whichpin locating plate 39 is mounted.Plate 39 has an inwardly extending perforated tongue, 80, the perforations having a constant pitch, and being of a size and shape suitable for engagement by the locating pins ofmoveable bulkheads 38. Also located intermittently along a more outboard region ofplate 39 are tie-downeyes 84 for locating a cowling or cover to protect coils mounted oncoil car 20 from being exposed to the rain and snow.Lower flange assembly 72 includes a main lower sill member in the nature of a hollowrectangular tube 86 to which a ¾″ thick steellower sill reinforcement 88 has been added.Webbing 74 includes a substantiallyvertical steel web 90 welded at lap joints to the respective outer faces ofsteel tube 76 andrectangular tube 86. Vertical braces 92 extend betweentubes web 90 at regular spacings along the length ofbeams web 90. - Over the mid span section of
car 20, that is, the portion ofcar 20 at which side beams 30 and 32 have their maximum depth, the overall second moment of area of eachside beam car 20. - The joining of
cradle 34 to each of side beams 30 or 32 is typically as shown in FIG. 7. Deck Plate, 44 has a vertical upturned lip 102 that is welded along the inwardly facing side ofsteel tube 76. Theweb 104 ofcross bearer 42 extends beyond the ends of its upper andlower flanges substantial tab 110 suitable for welding in a lap joint to thelongitudinally facing side 112 ofvertical brace 92. The joint is welded at a fillet along the corner ofvertical brace 92 on one face oftab 110, and at a fillet along the distally extreme edge oftab 110 toside 112. In this way the joint is intended to place the weldmetal predominantly in shear.Web 104 also hasintermediate gussets 114 to provide reinforcement in the region ofwooden decking 37.Wooden decking 37 is provided for the known purpose of cushioning metal coils loaded incar 20, as noted above. - Considering the side view of
car 20 shown in FIG. 6, moving away from the mid span centerline ofcar 20 on Transverse Section TS, the section of greatest depth ends at a point designates as ‘X’.Lower sill reinforcement 88 ends, and hollowrectangular tube 86 is obliquely truncated and welded to adoglegged upsweep flange 120.Flange 120 follows the lower edge ofweb 90 as it narrows in atransition portion 121 from the deep, mid span portion, 122 to the narrow, or shallow,end structure portion 124, the upward sweep offlange 120, reaching a height sufficient to clear trucks 26 and 28, as the case may be. Theupper portion 130 of the dog leg has an exaggerated, or extended, reach to yield a relief, or accessway, indicated generally as 132 between thenear wheel 134 of truck 26 or 28, and the truncated end oflower sill tube 86. This extended recess facilitates maintenance and repair of operating mechanisms ofcar 20, such as brake linkages. It also makes for a more efficient use of material since the depth of section required at mid span is generally greater than that required near the ends of the span for a simply supported beam. This permits a saving in weight. - Moving still further toward the end of
car 20, the accumulated vertical shear load in side beams 30 and 32 is carried to trucks 26 and 28 of end structures 22 and 24, as shown in the sectional view of FIG. 8a. Main bolster 140 has the form of a laterally extending irregular box with a pair of spaced apart, substantiallyparallel webs Webs upper flange 146underlying deck plate 36.Webs tab 148 that reaches under and supportsupper flange assembly 70, abuts the inside face ofweb 90, and also abuts the top face ofupswept flange 120. - In alternative embodiments of the invention to that shown, it would be possible to design a car having a cradle with either a stepper or a shallower slope, with consequent alteration of the height of the center sill relative to the side beams. However, given the relatively higher pliability of the center sill under vertical bending loads as compared to the side beams, it is undesirable for the chord of maximum stress (and therefore strain) to be in the lower flange of the center sill. To that end, the lower flange of the center sill, that is, its lowest extremity, is no lower than the lowest extremity of the side beams. Similarly, the highest compressive stress due to vertical load will occur in the highest portions to
top chord assembly 70. - S In terms of carrying compressive longitudinal loads between coupler ends, it is advantageous to retain a straight through sill. This implies a relatively high sill since standard coupler height is 33 inches above top of rail to the center of the coupler.
- In the embodiment illustrated, the centroid of area of
car 20 is at a height just below the top oftop flange 50, within the profile ofcenter sill 40. As such, center sill 40 plays only a small role in resistance to vertical bending. - It is possible to benefit from simplified production when all the cross bearers are of the same design, but some benefits can be obtained even when some cross ties remain, whether they are half as numerous, two thirds as numerous, one third as numerous as the cross bearers or some other fraction.
- A preferred embodiment has been described in detail and a number of alternatives have been considered. As changes in or additions to the above described embodiments may be made without departing from the nature, spirit or scope of the invention, the invention is not to be limited by or to those details, but only by the appended claims.
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/409,640 US20030230214A1 (en) | 1998-10-09 | 2003-04-08 | Coil car structure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/169,221 US6543368B1 (en) | 1998-10-09 | 1998-10-09 | Coil car structure |
US10/409,640 US20030230214A1 (en) | 1998-10-09 | 2003-04-08 | Coil car structure |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/169,221 Continuation US6543368B1 (en) | 1998-10-09 | 1998-10-09 | Coil car structure |
Publications (1)
Publication Number | Publication Date |
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US20030230214A1 true US20030230214A1 (en) | 2003-12-18 |
Family
ID=22614694
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/169,221 Expired - Lifetime US6543368B1 (en) | 1998-10-09 | 1998-10-09 | Coil car structure |
US10/409,640 Abandoned US20030230214A1 (en) | 1998-10-09 | 2003-04-08 | Coil car structure |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/169,221 Expired - Lifetime US6543368B1 (en) | 1998-10-09 | 1998-10-09 | Coil car structure |
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US (2) | US6543368B1 (en) |
Cited By (2)
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CN103661441A (en) * | 2013-12-18 | 2014-03-26 | 南车二七车辆有限公司 | Special goods van for transporting roll steel and iron mine powder of longitudinal V-shaped-groove railway |
US11643118B2 (en) | 2019-04-18 | 2023-05-09 | Gunderson Llc | Railcar for transport of steel coils with removable bi-level roof |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
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US6637990B2 (en) * | 2000-12-15 | 2003-10-28 | National Steel Car Limited | Coil car with internal walkway |
AU2006338504B2 (en) * | 2006-02-13 | 2010-02-18 | Vestas Wind Systems A/S | Fixture for gripping an end of a member |
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US7972098B2 (en) * | 2007-11-27 | 2011-07-05 | Kastalon, Inc. | Liner for cushioning and securing rolled coils and other cylindrical objects in a transverse trough of a railway car |
US7815404B2 (en) * | 2007-11-27 | 2010-10-19 | Kastalon, Inc. | Liner for cushioning and securing rolled coils and other cylindrical objects in a transverse trough of a railway car |
USD703582S1 (en) * | 2013-05-17 | 2014-04-29 | Joshua Oren | Train car for proppant containers |
WO2013151996A1 (en) * | 2012-04-02 | 2013-10-10 | Jac Operations, Inc. | Transverse trough coil car with modular trough forming assemblies and method of forming same |
CN102745207A (en) * | 2012-07-20 | 2012-10-24 | 南车二七车辆有限公司 | Special railway truck for conveying steel coils and ore |
US20150097098A1 (en) * | 2013-10-03 | 2015-04-09 | Jimmy Chi | Steel coil protection structure |
US9701323B2 (en) | 2015-04-06 | 2017-07-11 | Bedloe Industries Llc | Railcar coupler |
US10752154B2 (en) | 2015-11-30 | 2020-08-25 | Utc Overseas, Inc. | Modular systems and methods for transporting tower assembly of wind turbine |
US10315667B2 (en) * | 2016-01-28 | 2019-06-11 | Jac Operations, Inc. | Railroad coil car floating floor sheet |
USD782942S1 (en) * | 2016-02-08 | 2017-04-04 | Michael Trifaro | Adult tricycle |
US10689012B2 (en) | 2017-05-11 | 2020-06-23 | National Steel Car Limited | Railroad freight car access fittings |
US11492023B2 (en) | 2018-04-10 | 2022-11-08 | Jac Operations, Inc. | Transverse trough coil car and slab car with integral adjustable lateral coil stops, vertical trough height adjustment and width adjustable fixed stanchions |
US11713186B1 (en) * | 2019-03-13 | 2023-08-01 | Cakeboxx Technologies, Llc | Coil transporting intermodal shipping container |
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Citations (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2494404A (en) * | 1947-04-30 | 1950-01-10 | Harold G Nixon | Trailer |
US2991734A (en) * | 1959-09-10 | 1961-07-11 | United States Steel Corp | Convertible car floor |
US3291072A (en) * | 1965-02-25 | 1966-12-13 | Gen Steel Ind Inc | Steel-coil carrying car |
US3307495A (en) * | 1965-02-09 | 1967-03-07 | Evans Prod Co | Railway car |
US3353506A (en) * | 1965-12-13 | 1967-11-21 | Pullman Inc | Adjustable restraining means |
US3376062A (en) * | 1966-05-02 | 1968-04-02 | Fruehauf Corp | Hinged coil well cover |
US3413931A (en) * | 1966-10-21 | 1968-12-03 | Evans Prod Co | Freight bracing device |
US3465692A (en) * | 1966-10-25 | 1969-09-09 | Evans Prod Co | Freight bracing device |
US3581674A (en) * | 1969-04-16 | 1971-06-01 | Acf Ind Inc | Railway flatcar |
US3628466A (en) * | 1969-07-15 | 1971-12-21 | Pullman Inc | Railroad boxcar and movable platform stops therefor |
US3658195A (en) * | 1970-06-12 | 1972-04-25 | Chevron Res | Disappearing safety wedge |
US3658011A (en) * | 1969-11-06 | 1972-04-25 | Planet Corp | Coil car |
US4451188A (en) * | 1981-12-09 | 1984-05-29 | Portec, Inc. | Coil car with shiftable trough assemblies |
US4782762A (en) * | 1987-05-07 | 1988-11-08 | Trinity Industries, Inc. | Well car end girder arrangement |
US4805539A (en) * | 1987-05-07 | 1989-02-21 | Trinity Industries, Inc. | Well car end structure having frameless radial truck |
US4841876A (en) * | 1988-05-27 | 1989-06-27 | Thrall Car Manufacturing Company | Railroad container transporting car of increased weight carrying capacity |
US5085152A (en) * | 1989-11-22 | 1992-02-04 | Trinity Industries | Well car crossbearer side connection |
US5170717A (en) * | 1990-03-20 | 1992-12-15 | Thrall Car Manufacturing Company | Railroad cars for transporting cylindrical objects transversely with multi-piece movable cover for exposing entire cargo area |
US5191842A (en) * | 1991-10-01 | 1993-03-09 | Consolidated Rail Corporation | Modular structure for converting rail cars for carrying both coiled and plate materials directly on longitudinal rails and cross members |
US5211518A (en) * | 1991-05-24 | 1993-05-18 | Qcx Partners, Inc. | Motor vehicle trailer for hauling steel coils |
US5562046A (en) * | 1994-08-30 | 1996-10-08 | Trinity Industries, Inc. | Load bearing crossbearer connection |
US5622116A (en) * | 1993-02-16 | 1997-04-22 | Carlton; Jerry W. | Coil transport trailer |
US6077005A (en) * | 1997-11-28 | 2000-06-20 | Trinity Industries, Inc. | Vehicle with collapsible platform |
-
1998
- 1998-10-09 US US09/169,221 patent/US6543368B1/en not_active Expired - Lifetime
-
2003
- 2003-04-08 US US10/409,640 patent/US20030230214A1/en not_active Abandoned
Patent Citations (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2494404A (en) * | 1947-04-30 | 1950-01-10 | Harold G Nixon | Trailer |
US2991734A (en) * | 1959-09-10 | 1961-07-11 | United States Steel Corp | Convertible car floor |
US3307495A (en) * | 1965-02-09 | 1967-03-07 | Evans Prod Co | Railway car |
US3291072A (en) * | 1965-02-25 | 1966-12-13 | Gen Steel Ind Inc | Steel-coil carrying car |
US3353506A (en) * | 1965-12-13 | 1967-11-21 | Pullman Inc | Adjustable restraining means |
US3376062A (en) * | 1966-05-02 | 1968-04-02 | Fruehauf Corp | Hinged coil well cover |
US3413931A (en) * | 1966-10-21 | 1968-12-03 | Evans Prod Co | Freight bracing device |
US3465692A (en) * | 1966-10-25 | 1969-09-09 | Evans Prod Co | Freight bracing device |
US3581674A (en) * | 1969-04-16 | 1971-06-01 | Acf Ind Inc | Railway flatcar |
US3628466A (en) * | 1969-07-15 | 1971-12-21 | Pullman Inc | Railroad boxcar and movable platform stops therefor |
US3658011A (en) * | 1969-11-06 | 1972-04-25 | Planet Corp | Coil car |
US3658195A (en) * | 1970-06-12 | 1972-04-25 | Chevron Res | Disappearing safety wedge |
US4451188A (en) * | 1981-12-09 | 1984-05-29 | Portec, Inc. | Coil car with shiftable trough assemblies |
US4782762A (en) * | 1987-05-07 | 1988-11-08 | Trinity Industries, Inc. | Well car end girder arrangement |
US4805539A (en) * | 1987-05-07 | 1989-02-21 | Trinity Industries, Inc. | Well car end structure having frameless radial truck |
US4841876A (en) * | 1988-05-27 | 1989-06-27 | Thrall Car Manufacturing Company | Railroad container transporting car of increased weight carrying capacity |
US5085152A (en) * | 1989-11-22 | 1992-02-04 | Trinity Industries | Well car crossbearer side connection |
US5170717A (en) * | 1990-03-20 | 1992-12-15 | Thrall Car Manufacturing Company | Railroad cars for transporting cylindrical objects transversely with multi-piece movable cover for exposing entire cargo area |
US5211518A (en) * | 1991-05-24 | 1993-05-18 | Qcx Partners, Inc. | Motor vehicle trailer for hauling steel coils |
US5191842A (en) * | 1991-10-01 | 1993-03-09 | Consolidated Rail Corporation | Modular structure for converting rail cars for carrying both coiled and plate materials directly on longitudinal rails and cross members |
US5622116A (en) * | 1993-02-16 | 1997-04-22 | Carlton; Jerry W. | Coil transport trailer |
US5562046A (en) * | 1994-08-30 | 1996-10-08 | Trinity Industries, Inc. | Load bearing crossbearer connection |
US6077005A (en) * | 1997-11-28 | 2000-06-20 | Trinity Industries, Inc. | Vehicle with collapsible platform |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103661441A (en) * | 2013-12-18 | 2014-03-26 | 南车二七车辆有限公司 | Special goods van for transporting roll steel and iron mine powder of longitudinal V-shaped-groove railway |
US11643118B2 (en) | 2019-04-18 | 2023-05-09 | Gunderson Llc | Railcar for transport of steel coils with removable bi-level roof |
US11840268B2 (en) | 2019-04-18 | 2023-12-12 | Gunderson Llc | Railcar for transport of steel coils with removable bi-level roof |
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US6543368B1 (en) | 2003-04-08 |
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