TW201144188A - Freight container - Google Patents

Abstract

The present invention provides a freight container including a pair of bottom side rails which are arranged along bottom end edges of a pair of side panels; having a plurality of joists in which a bottom pallet is provided across the pair of the bottom side rails and a floor surface which is provided on the joists. When the joists are seen from the plane cross sectional view, the freight container includes a web which is extended approximately parallel to the length direction of a corner post, an upper flange which is extended approximately parallel to the length direction of the bottom side rail from the top end of the web, a bottom flange which is extended approximately parallel to the length direction of the bottom side rail from the bottom end of the web facing the upper flange, and an upper lip which is extended approximately parallel to the length direction of the corner post from the upper flange to a downward direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for goods for transporting goods by sea and on land, and more particularly to a weight reduction for one side - A container for goods when the strength of the member is raised. This application claims priority based on Japanese Patent Application No. 2010-112491, filed on May 14, 2010, which is incorporated herein by reference. C Former Winters; J Background of the Invention The container for goods used for transporting goods is mainly composed of steel, non-recorded steel, and other components made of metal, and is composed of a rectangular parallelepiped box. In addition, s Xuan; k material is used to load goods inside the grain, and is transported by means of transportation such as ships, trucks, railways, etc. In recent years, in the field of logistics, the trend of reducing the amount of greenhouse gas emissions is increasing, and the means of moving ships, trucks, railways, etc., which are used to transport goods, are becoming lighter. get on. Since the container for the cargo is transported by the above-mentioned moving means, it is preferable to reduce the weight of the container itself and reduce the weight of the entire moving means, and it is preferable to achieve global environmental protection. With such a background, even the requirement for lightweighting containers for goods is being raised. However, on the one hand, it is necessary to ensure that all the specifications in the world, such as ISO, especially for bearing performance, are required to be lightweight. . In addition, the form of the container for the goods generally consists of a rectangular bottom. 3 201144188 Pad, 1 stand & placed on the money pad 4 _ pairs · panel and __ on the front and rear panels, 1: vertical a ;|, j describes the corners of the bottom plate and connects the side edge portions of the side panels and the plurality of corner posts between the sides of the 4 φ plate, and the corner fittings disposed at the upper and lower ends of the equiangular columns (e.朦fitting), and a structure m for connecting the top panel and the top panel of the front and rear panels (4), the silk panel has a bottom side extending toward the short side of the container and depending on the lower edge of the side panel The plurality of joists between the rails and the bottom material supported on the upper side of the joists are configured (for example, refer to Patent Document 1). The joist (cross joist) described in Patent Document 1 has a web (main wall portion) that extends upward and downward, and extends from one of the upper ends of the web toward the upper side (the upper wall portion), and The lower end of the web extends in one of the directions to extend the lower wing (lower wall portion). The joist is formed in a slightly c-shaped cross section, and the bottom material is screwed to the upper wing. The joist of the container for such a cargo is designed to take into consideration the wheel load such as a pusher that transports the loaded cargo and travels inside the container, and can secure the strength of the member against the bending stress acting on it. In addition, it is known that it is a container for cargo and is used as a thin and lightweight steel for use in buildings (for example, refer to Patent Document 2). The grooved steel having the lip described in Patent Document 2 has a web, a pair of flaps connected to one end and the other end of the web, and bent from the front end of the flap and extending parallel to the web One of the pair of lips, and the section is slightly (: glyph. Moreover, the grooved steel of such a lip is also used as a bending member of a beam, etc. The neutral axis of the channel steel is located in the middle of the web, and the groove In the steel, by the 201144188, one of the flaps and the lip becomes the stretched side, and the other of the flaps and the lip becomes the bending stress state on the compression side to resist the load. [Prior Art Document] [Patent Document] [Patent Document 1] Japan National Special Publication No. 2004-276936

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2005-105557, C. CHEUNG YUAN J. SUMMARY OF THE INVENTION [Problems to be Solved by the Invention] From the viewpoint of weight reduction of containers, consideration is given to improving the material strength (falling strength) of each member. Moreover, the section (thickness) of the member is made smaller (thinner). However, as in the case of the conventional joist, when the upper flap is on the compression side, if the thickness is thinned, the upper flap will be frustrated at an early stage, and the bending strength according to the imaginary strength cannot be obtained. Therefore, it is also considered to use the grooved steel of the lip of Patent Document 2 as the joist 'S. In this case, since the lower wing is also formed with a lip, water, dust, and salt are accumulated on the lower wing. The cause of the birth of the so-called container, the problem of short-term life of the so-called container products. Thus, in the conventional structure, there is a so-called "unable to ensure that the members of the bending load are sturdy-face-finished" and that the requirements for long-term durability are also required to provide the joist A container for goods that is lightweight and can be used for long-term rotation resistance: purpose. . . . , [Means for Solving the Problem] The container for goods of the present invention includes a rectangular bottom 塾 201144188 plate; a pair of side panels and a pair of front and rear panels are erected from the four sides of the bottom plate The corner post is erected on the corner portion of the bottom pad and connected to each side edge portion of the side panel and the front and rear panels; and the top panel is connected to the upper side panel and the upper edge of the front and rear panels; The container for goods includes one of a pair of bottom side edges disposed along each of the lower end edges of the pair of side panels, and the bottom pad has a plurality of bases disposed between the pair of bottom side rails The beam and the floor surface material provided on the joists have a web extending substantially parallel to the extending direction of the corner post when viewed from the plane cross section, from the web end and the bottom side a direction in which the rail extends substantially parallel to the upper wing, opposite the upper wing, and extending from the lower end of the web substantially parallel to the extending direction of the bottom side rail, and the extension of the corner post It extends over the lip portion substantially parallel downward from the front end toward the blade. (2) The container for cargo according to the above (1), wherein the width of the flat portion of the upper blade is wider than the thickness F of the material and the following formula (1) } is better: 240t / (VF) < a ^ 740t / (VF) ... (1), 'the thickness of the plate thickness t is the unit of mm here, the unit of the width dimension a is claw hunger, fall The unit of the strength F is MPa. The medium-large one is better == (1) the coffee guide, and the width dimension of the lower wing of the above-mentioned joist is lower than the width dimension of the upper wing (1) or (2) In the section, Yu Yu ^ A is used to describe the relationship between the neutral axis of the straight parent and the thick center of the upper wing panel 201144188 and the height dimension h of the flat portion of the web. It is preferable to satisfy the following formula (2): 0.45h^0.60h... (2). Further, the distance between the center of the upper blade and the neutral axis (1 is 〇475); (5) The container for goods described in (1) or (2), in the joist, by the thickness t of the plate, the strength F of the material, and the upper wing The width dimension A of the board is calculated using the following formula (3) In the case of a number of turns, the length C of the upper lip portion when viewed in a cross section perpendicular to the extending direction of the joist beam satisfies the following formula by the aforementioned constant Μ, the thickness of the plate (and the fall strength F of the aforementioned material) (4) is better. M = max[2.8t { (A/t)2 — 28000/F } "6, 4 弋(7), M^C^240t/(VF)...... (4) Here, the unit of the thickness t of the plate is the duty, the unit of the lodging strength is MPa, and the unit of the width dimension A of the upper blade is the work. [Effect of the invention] According to the goods described in the above (1) The container has a lip that extends from the front end of the upper wing to the lower lip of the upper wing, so that even if the material strength of the material is increased, the deformation of the wing on the compression side when bending the load can be improved. Strength. By this, 0 squares stop the early setback of the upper wing

Flexing and ensuring the strength of the component against the bending load β A When the bending load is applied, the lower wing is stretched to the side without buckling. By using the shape of your & lower wing with a flat shape and open end, it prevents water from remaining on the lower wing of the dinger's lower wing, and prevents the deterioration caused by rust and prolongs the durability of the year 201144188. By ensuring the strength of the member and the number of years of durability, the strength of the material of the joist is increased, and the cross-section of the member is made thinner, so that the weight of the joist can be reduced. In this way, it is possible to reduce the weight of the entire container for the cargo, and it is also possible to reduce the temperature to the discharge amount of the effect gas and further from the viewpoint of global environmental protection. According to the container for cargo described in the above (2), the width dimension a of the flat portion of the upper blade is set to be larger than 240 t/(VF), that is, the width-to-thickness ratio (a/t) of the plate thickness dimension t is set. Large, and the joist can be thinned. At this time, it becomes easy to frustrate when the width dimension a becomes larger than 240 t/(VF) in the conventional configuration, and in the present invention, the upper lip portion can be formed as described above, and the upper wing panel can be prevented. Early frustration. On the other hand, the width dimension a of the flat portion of the upper blade is set to be 740 t/(VF) or less 'that is, the width dimension a of the flat portion of the upper blade is set to be restricted even on the upper lip and the web. The state of the ends of the wing is also below the limit width of the possibility of frustration, and it can surely prevent the frustration of the upper wing. Therefore, 'because it can be surely prevented from bending when the bending load becomes the buckling of the upper side of the compression side', the ineffective part of the cross section of the member which does not cause frustration becomes the effective section, and the lightly efficient section can be efficiently obtained. Quantify. According to the container for cargo described in the above (3), the width of the lower blade is set larger than the width of the upper blade, and the sectional area of the lower blade which becomes the tension side when the load is bent is increased. And can increase the bending strength. Further, by making the sectional area of the lower blade larger, the total sectional area of the upper lip portion and the lower lip portion can be made close to the sectional area of the lower blade. Thereby, the balance is balanced between the upper side and the lower side of the joist. Therefore, it is possible to suppress the eccentricity of the neutral axis toward the upper blade side and to position the neutral axis in the vicinity of the middle of the web, so that the full-section can be made into a container for cargo that is valid in 201144188, and as described above, the use becomes effective. The vicinity of the middle of the crushed material can make the full section the same degree. (4) = section coefficient of the section and the section coefficient of the stretched edge. Early fall, and the _ compression edge or the stretch edge of any of the moons can ensure the joist-curvature strength. According to the container for cargo described in the above (7), by using the length C of the upper lip portion to be constant Μ or more, it is possible to effectively prevent the upper blade from being frustrated and to set the length dimension 0 to 24 〇 t / (VF). In the following, the material can also be prevented. . [5 itself is frustrated, and it can be used as an effective section when the various parts of the joist are not played until the predetermined 4' curvature does not occur. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a section of a container for cargo according to an embodiment of the present invention as a cross section. Fig. 2 is an enlarged sectional view showing a joist of a bottom pad of the container for cargo of Fig. 1. Fig. 3 is a cross-sectional view showing the joist of the first embodiment of the container for cargo. Fig. 4 is a cross-sectional view showing the joist of the second embodiment of the container for cargo. Fig. 5 is a sectional view showing a joist of a comparative example. Fig. 6 is a graph showing the results of analysis of the examples and comparative examples. 201144188 Figure 7 shows the chart of other analysis results. Figure 8 is a graph showing other analysis results. Figure 9 is a graph showing other analysis results. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The container 1 for cargo according to the embodiment of the present invention is constituted by a casing as shown in Fig. 1, and the goods can be loaded. The container i for goods is made of steel, non-recorded steel, and steel. Since the container 1 for cargo is transported by means of transportation means such as a ship, a truck, or a railway, it is based on the specification of ISO and other specifications from the viewpoint of improving the interchangeability and convenience of transportation. a bottom plate 2 having a rectangular shape, a pair of side panels 3 and a pair of front and rear panels 4 rising from four sides of the bottom plate 2, and a corner portion of the bottom plate 2 are erected and connected to the side panel 3 And a corner post 5 of each side edge portion of the front and rear panels 4, and a top panel 7 provided to be connected to the upper edge portions of the side panel 3 and the front and rear panels 4. Further, the cargo container 1 has a corner fitting 6 joined to the upper end and the lower end of the equiangular column 5, and a bottom side rail 10 disposed along each lower end edge of the pair of side panels 3. Each of the side panel 3 and the front and rear panels 4 is disposed on the bottom pad 2, and the adjacent panels 3, 4 are connected to each other through the corner posts 5. The adjacent side panels 3 and the front and rear panels 4 are in a slightly orthogonal relationship to each other. Further, the side panel 3, the front and rear panels 4, and the top panel 7 are formed of a wave-shaped steel sheet made of, for example, a relatively thin steel plate having a thickness of about 1 $ mm to 2 mm. On the side of the container 1, the front, the rear, and the top surface of the container 1 are provided with a switch door (not shown), and the goods are loaded into the container from here. For example, when any of the front and rear doors is provided with a door for opening and closing, the pusher or the like enters and exits the inside of the cargo container 1 from the door to carry in or carry out the loaded goods. The bottom pad 2 has a plurality of joists 8 disposed across the bottom side rails i and a floor surface material 9 provided on the upper side of the plurality of joists 8. The joist 8 is joined to the bottom side rail 10 of the lower end edge of the side panel 3 by means of welding. The floor surface material 9 is made of a plate material such as a plywood, and is fixed to the upper side of the joist 8 by screwing or the like. The bottom pad 2 supports the load of the load and the wheel load of the pusher or the like that travels in the cargo container 1, and receives the downward concentrated load in the center position in the longitudinal direction of the joist 8. Thereby, a downwardly convex positive bending moment acts on the joist 8. Here, when the joist 8 is subjected to bending, the bottom side rails 10 at both ends are deformed, and since they are resisted by the simply supported beams pivotally supported at both ends of the joists 8, they are hardly at both ends of the joist 8 The negative bending moment of the upper convex. Next, the configuration of the joist 8 will be described in detail based on Fig. 2 . Here, the surface direction of the front and rear panels 4 is referred to as the X direction (width direction), the surface direction of the side panel 3 is referred to as the γ direction (longitudinal direction), and the direction in which the corner pillars are extended is referred to as the Z direction. Further, as shown in Fig. 2, the joist 8 is formed by cutting the steel sheet material into a strip shape which is extended between the side rails 10 and has a slightly C-shaped cross section when viewed as a plane cut surface. The joist 8 has a web u extending slightly parallel to the extending direction of the corner post 5 (up and down direction: z direction), and extending slightly parallel from the extending direction of the upper end of the belly (four) and the bottom difficulty ig (side: Y direction) The flap 12 is slightly parallel to the upper wing relative to 201144188 and extends from the lower end of the web 11 and the bottom side rail 1 () to the lower wing 13 and the direction of the corner post 5 (upper and lower (four) from The front end of the upper wing 12 faces the lower wing 13 and the upper portion 14 is formed. Further, the connecting portion of the web 11 and the upper blade 12 is formed with a bent portion 15 and a connecting portion between the upper blade 12 and the upper lip portion 14 is formed. The folded portion 16 is formed, and the flat portion of the upper blade 12 is closed, and the flat portion 18 of the upper lip portion 19 is formed on the lower end side of the bent portion 16. ^, Dan Kao, web 11 The connecting portion with the lower blade 13 is formed with a bent portion 19, and the flat portion 20 of the web 11 is formed between the bent portion 丄5 and the 丄9, and the lower flap 13 is formed on the front end side of the bent portion 19. The flat portion 21' the front edge of the flat portion 21 is an open end edge 22 that is open in the extending direction (side) of the bottom side rail 10. The size of each part is defined as shown in Fig. 2 as in Fig. 2: A: width dimension of upper wing 12 [mm] a: width dimension of flat portion 17 of upper wing 12 [mm] B: lower wing 13 Width dimension [mm] b : width dimension of the flat portion 21 of the lower blade 13 [mm] Η : height dimension of the web 11 [mm] hl : center distance of the plate thickness of the upper and lower blades 12, 13 [mm] h : height dimension of the flat surface 20 of the web 11 [mm] C : lip length of the upper lip portion 14 [mm] c : length dimension of the flat portion 18 of the upper lip portion 14 [mm] t : thickness gauge i [mm] r : center radius of the plate thickness of the bent portions 15, 16, 19 [mm] 12 201144188 u : center axis length of the plate thickness of the bent portions 15, 16, 19 (= kR/2) [mm] d : upper The distance between the center of the plate thickness of the blade 12 and the neutral axis [mm] Further, the drop strength of the material used for the joist 8 is defined as F [MPa]. In the above-mentioned drag beam 8, each part has the following dimensions. The formula (1) to the formula (3) are defined. First, when the width dimension a of the flat portion 17 of the upper blade 12 is the thickness t and the fall strength F, the following formula (1) is satisfied. Relationship 240t / (/F) <a$740t / (, F) ...... (1) Here, for example, the lodging strength F is 5 In the case of 50 MPa, when the thickness t of the plate is 2.1 mm, the width dimension a of the flat portion 17 is 21.5 mm < a^66.3 mm. If the thickness t of the plate thickness is 2.5 mm, the width dimension a of the flat portion 17 is When the thickness F is 2.1 mm, the width dimension a of the flat portion 17 is 19.0 mm < a $ 58 - 7 mm. When the thickness of the plate is 2.5 mm, the width a of the flat portion 17 is 22.7 mm < 69.9 mm. That is, since the conventional joist does not have the upper lip, in order to prevent the upper wing from frustration, the width dimension a must be set to the left side of the formula (1). Therefore, for example, when the drop strength is 355 MPa and the sheet thickness t is 4.0 mm, the width dimension a is about 50 mm or less, which is a practical size. However, when the thickness F is increased to 550 MPa and the thickness t of the plate is reduced to 2.5 mm, 'the width dimension a is limited to about 25 mm or less and cannot constitute a practical member size, so the thickness t of the plate is made thin. There are difficulties. On the other hand, in the joist 8 of the present embodiment, by providing the upper lip portion 14, the width dimension a of the flat portion π of the upper blade 12 can be made larger than the left side of the formula (1), and 13 201144188 is set to the right. Hereinafter, even if the lodging strength F is increased to 550 MPa or 700 MPa, the frustration of the upper wing 12 can be prevented on the one hand. On the one hand, even if the thickness t of the plate thickness is reduced to about 2.0 mm to 3.0 mm, it can be practical. The range of the width dimension a forms the joist 8. Next, the width dimension B of the lower blade 13 is set to be the same as the width dimension A of the upper blade 12, or is preferably set to be larger than the width dimension A of the upper blade 12 as in the following formula (2). A<B (2) Further, the distance d between the neutral axis X orthogonal to the web of the section of the joist 8 and the center of the thickness of the upper blade 12, and the flatness of the web 11 It is preferable that the relationship of the height dimension h of the portion 20 is set to satisfy the following formula (3). 0.45h^d^0.60h (3) Further, the distance d satisfies the formula (3), but it is more preferable if it is set to satisfy the relationship of the following formula (4). 0.475h^d^0.55h (4) Thus, by setting the width dimensions A, B of the upper and lower blades 12, 13 and the distance d between the neutral axis X and the center of the plate thickness of the upper blade I2 Bending load

Improve the bending strength. Secondly, the length dimension of the upper lip portion 14 of the joist 8 is set to satisfy the 7 M^C^240t/(VF) equation (5) by the thickness t and the falling strength F. Here, the constant Μ system By the thickness of the plate, the relationship of the foot type (5) is preferred. The width dimension A is calculated using the following formula (6). , the lodging strength F and the upper wing 12 14 201144188 M-max[2.8t{(A/t)2-28000/F}i/6, 4.8t]. (6) Thus, by setting the lip length of the upper lip 14 C, the frustration of the upper wing 12 can be effectively prevented, and the buckling of the upper lip portion 14 itself can also be prevented. As a result, it is possible to function as an effective area without causing the respective portions of the joists 8 to frustrate until the predetermined bending strength is exerted. According to the present embodiment as described above, the joist 8 is formed by the upper lip portion to increase the relief strength F of the joist 8, and even when the thickness of the joist 8 is made thin, it is possible to prevent the bending load from becoming a compression cross. ^ The early setback of the slab 12 ensures the strength of the member for the bending load. The 翼 翼 wing 13 is a stretched side without bending and bending. The lower wing plate 13 is formed to open the front end of the flat soil, so that water, dust and salt can be prevented from accumulating on the surface of the r-shaped plate 13, and the deterioration caused by rust can be prevented, and the durability is prolonged by the long-term. While ensuring the strength of the predetermined component and the number of years of durability, the surface of the joist 8 is increased by 8 to reduce the cross-section of the member, and the weight of the abutment can be reduced. Furthermore, it is possible to reduce the weight of the entire container for goods. [Embodiment] The following describes a result of reviewing the strength of the member of the joist 8 with respect to the container 1 for a cargo according to an embodiment of the present invention. (Fig. 3 is a cross-sectional view showing a joist 8 of an embodiment (Embodiment 1) according to an embodiment of the present invention, and Fig. 4 is a schematic view showing a second embodiment of the present invention. A cross-sectional view of the joist 8. Further, Fig. 5 shows a cross-sectional view of the joist 800 of the conventional example (Comparative Examples 1 and 2). Here, in Fig. 4 and Fig. 5 In the figure, the center radius R of the plate thickness of the bent portion (usually R = 1 to ~3 t) is omitted, but it can be appropriately designed according to the formability of the material. Thus in 15 201144188 Examples and comparisons In the description of the example, since the plate center radius R of the bent portion is omitted, the width dimension a (the width dimension of the flat portion 上 of the upper blade 12) is defined as the width dimension A (the upper blade 12) in the following description. In the case where the center radius R of the plate thickness of the bent portion is set, the width dimension A (the upper blade width dimension) can be appropriately read as the width dimension a (the width of the flat portion of the upper blade) In the present embodiment, the strength ratio of each of the joists 18, 28, and 800 and the strength ratio per unit weight are compared. The weight F of the joist 18 of the embodiment 1 is 550 MPa, and the thickness t of the plate is 2.5 mm. As shown in Fig. 3, the height dimension η of the web 11 of the joist 18 is 122 mm, and the width of the upper wing 12 is The ridge is 45 mm, the width dimension B of the lower wing 13 is 45 mm', and the lip length C of the upper lip portion 14 has a cross section of 23 mm. That is, the width of the wing 12 above the joist 18 shown in Fig. 3 is used. The dimension A is set to be the same as the width dimension B of the lower wing plate 13. The weight F of the joist 28 of the embodiment 2 is 550 MPa, and the thickness of the plate is [2.5 mm. As shown in Fig. 4, the web of the joist 28 The height dimension of 11 is 122 mm, the width dimension A of the upper wing 12 is 45 mm, the wide dimension B of the lower wing 13 is 60 mm, and the lip length C of the upper lip 14 has a section of 23 mm. The width dimension B of the plate 13 is set to be larger than the width dimension A of the upper dam 2 above the joist 28 shown in Fig. 4. At this time, in the embodiment 由于, due to the width dimension A of the upper wing 12 and the lower The width dimension b of the flap 13 is the same, so that the neutral axis X of the joist 18 is located on the upper side of the middle position of the web 11. In other respects, in the second embodiment, the width dimension b of the lower flap 13 is The blade I) of the size of width 16201144188 A large, among the X axis of the joist 28 is located in the middle of the web. [Comparative Example] As shown in Fig. 5, the joist 800 of Comparative Examples 1 and 2 has a height Η of 122 mm for the web 811, a width A of the upper flap 812 of 45 mm, and a width B of the lower flap 813. 45mm, and the section without the upper lip is slightly C-shaped. Further, as Comparative Example 1, the lodging strength F was 355 MPa, and the sheet thickness t was 4.0 mm. As Comparative Example 2, the lodging strength F was 550 MPa, and the sheet thickness t was 2.5 mm. The comparative examples 1 and 2 were used as comparative examples. Here, in the joist 800 of the comparative example, the width dimension A (= 45 mm) of the upper blade 812 is smaller than the left side of the formula (1) (240 t / VF = 51 mm) in Comparative Example 1, so the formula is not satisfied ( 1). In Comparative Example 2, the width dimension A (= 45 mm) of the upper blade 812 exceeded the left side of the formula (1) (240 t / VF = 25.6 mm). Therefore, it is set such that the joist 800 of Comparative Example 1 does not frustrate before the upper flap 812 reaches the relief strength F, and the stress of the joist 800 of the vehicle example 2 is less than the stress F of the upper wing 812. Frustrated. Fig. 6 is a graph showing the intensity ratio of the examples and comparative examples and the intensity ratio per unit weight. Here, the bending strength of Comparative Example 1 and the strength per unit weight were taken as 1 to show the intensity ratio and the strength ratio per unit weight. In the joist 8 of Comparative Example 2, the relief strength F was increased to 550 MPa and the thickness t was 2.5 mm. Therefore, the strength ratio per unit weight exceeded the joist 800 of Comparative Example 1, however, As mentioned above, the upper wing Μ] is frustrated. Thereby, the strength of the joist 800 of Comparative Example 1 is reduced to 8〇% to about 17 201144188. In the same manner as the joist 8 of the comparative example 2, the joist 18 of the first embodiment has a high strength 550 MPa' and a thickness t of 2.5 mm. However, the upper lip 14 is provided with the upper flap 12 There was no setback, and the strength reduction as in Comparative Example 2 did not occur. That is, the strength equal to or higher than that of the joist 8 of Comparative Example 1 was exerted, and the strength per unit weight was increased. Further, the joist 28 of the second embodiment expands the sectional area by making the width dimension B of the lower flap 13 larger, and solves the problem that the position of the orthogonal axis X with the web is close to the middle of the web 11, and When the bending load is obtained, the strength of the upper side of the compression side is balanced with the strength of the lower side of the tension side when the bending load is applied, and the strength rises as compared with the embodiment, and the strength per unit weight also rises. Next, the positions of the neutral axis X are reviewed in the joists 18 and 28 of the shapes shown in Tables 1-1 to 4-2 (the distance between the center of the plate thickness of the upper blade 12 and the neutral axis X is generated. The change in strength. Here, Fig. 7 to Fig. 9 are graphs showing the results of the review of the joists 18 and 28, and Fig. 7 is a graph of Tables 1-1 to 2-2, and Fig. 8 is a table. 3-1, Table 3-2 is a graph, and Figure 9 is a graph of Tables 4-1 and 4-2. It is a graph of the results of the review of the corresponding joists 18 and 28. In each of the graphs of Fig. 9 and Fig. 9, the position of the neutral axis X is at the center in the height direction of the web 11, that is, the distance d between the center of the thickness of the upper flap 12 and the neutral axis X becomes the upper and lower flaps 12, The strength of the plate thickness of 13 is 1/2 of the distance hl. 18 201144188 [Table 1-1] Table 1 - 1

No. t HAB (mm) h hi a (nta) ((nm) (mra) (mm) (BJB) (tun) .(mm) 1 :2.5 122 45 40 23 112 119.5 35 2 2. 5 122 45 44 23 112 1.19' 5 35 3 2v 5 122 ..45 48 23 112 119.5 35 4 2. 5 122 45 52 23 112 119.5 35 5 2.5; 122 45 56 23 112. 119.5 35 6 2.5 122 45 .60 23 ΙΪ 2 119. 5 35 7 2.5 L22 45 64 23 112 119.5 35 8 2; 5 122 45 .68 23 112 119.5 35 9 2. 5 122 45 : 72 23 112 119. 5 35 ίο 2.5 '122 45 76 23 112 119. 5 35 ii 2.5 122 45 80 23 112 119. 5 35 12 2. 5 122 45 84 23 112 119.5 35 13 2,5 122 45 88 23 112 119-5 35 14 2,5 122 .45 92 23 112 119. 5 35 15 2 5 .122 :45;. 96 23. 112 119. 5 35 16 2.5 122 45 100 .23 112 119. 5 35 17 2,5 122 45 104 23 112 119. 5 35. 18 2 5 122 45 108 23: 112 119. 5 35 19 2. 5 122 45 112 23 112 119.5 35 20 2. 5 122 45 116 23 112 119· 5 35 21 2.5 122 45 120 23 112 119. 5 35 22 2.5 122 45 124 23 112 119.5 35 23 2/5 122 .45 , 128 23 112 119..5 35 24 2.5 122 45 132 23 112 119.5 .35 25 2. 5 122 45 136 23 112 119. 5 35 26 2. 5 90 4 5 40 23 80 87. 5 35 27 2. 5 90 .45: ..44: 23 80 87.5 35 28 2.5 90 45 .48 23 80 87.5 35 29 2. 5 90 45 52 23 80. 87.5 35 30 2.5: 90 45 56 23 80 87.5 35 31 2.5 90 45: ;60 23 80 87. 5 35 32 2. 5 90 45 64 23 80 87. 5 35 33 2.5 90 45 68 23 80 87. 5 35 34 2.5 90 45 72 23 80 87, 5 as 35 2, 5: 90 45 76 23 80: 87. 5 . 35 36 2. 5 90 45 80 23 80 87. 5 35 37 2. 5 90 45 84 23 80 87. 5 35 38 2. 5 90 45 88 23 80 87.5 35 39 2/5 90 45 92 23 80 87. *> 3S 40 2.5 90 45 96 23 80 87.5 35 41 2. 5 90 45 . J00 23 80 87. 5 35 42 2.5 .90 45 104 23 80 87.5 35 43 2.5 90 45 .. .108 23: 80 : 87.5 * 35 44 2. B 90 45 112 23 80 87. 5 .35 45 2. S 90 45 116 23 80 87. 5 35 46 2. B 90 45 120 23 BO 87. 5 35 47 2, 5 90 45 124 23 SO 87. Ti 35 48 2· 5 90 45 128 23 80 87. 5- 35 49 : 2. 5 90 45 132 23 80 87.. 5 35 .50 .2; 5 90 .4 5 136: .23 . 80 87, 5. :35 19 201144188 [Table 1-2] Table 1 _ 2

No. hc R dd/hl F Broken strength (ton) (mm) (tin) Cmio) (mm) (N/mro*) (mra·) (k N · mm) 1 35 18 3. 75 54.3 0. 45 550 544 9.72E+03 2 39 18 3. 75 55.5 0. 46 550 554 1.03E+04 3 43 IB 3. 75 56.6 0.47 550 564 1.08E+04 4 47 18 3. 75 57.7 0.48 550 574 1 13Ε+0Ί 5 51 18 3,75 58.7 0.49 550 584 1. 19Ε+Ό4 6 55 18 3.75 59.8 0. 50 550 594 L24E+04 7 59 18 3. 75 60.8 0.51 550 604 1.25E+04 8 63 18 3.75 61.7 0.52 550. 614 1.26E+04 9 67 18 3. 75 62.6 0.52 550 624 K 27H+04 10 71 18 3.75 63.5 0. 53 550 634 l;28E+04 11 75 18 3.75 64.4 0.54 550 644 1. 29E+ 04 12 79 U) 3.75 65.2 0. 55 550 654 1.30E+04 13 83 18 3.75 66· 1 0.55 550 664 1.31E+04 Μ 87 18 3. 75 66.9 0. 56 550 674 1, 32Π+04 15 91 18 3.75 67.6 0. 57 550 684 1, 32^+04 16 95 18 3.75 68.4 0. 57 550 694 1.33Ε+Ό4 17 99 18 3.75 69. 1 0. 58 550 704 1. 34E+04 18 103 18 3. 75 69.8 0. 58 550 714 -1. 34E+04 19 107 18 3.75 70f 5 0. 59 550 724 1. 35E+04 20 111 18 3. 75 71.2 0. 60 550 '734 ].35E+04 21 115 18 3.75 71.8 0. 60 550 744 L36E+04 22 119 18 3.75 72.4 0.61 550 754 K 36E+04 23 123 18 3,75 73. I 0.61 550 764 1.37E+04 24 127 18 3.75: 73.7 0. 62 550 .774 L 37E+04 25 131 lfi 3.75 74.2. 0. 62 550 784 1.38E+04 26 35 IS 3.75 39.4 0.45 550 464 6. 37E+03 27 39 18 3.75 40.4 0. 46 550 474 6.77F+03 28 43 18 3.75 41.4 0.47 550 Side 7. 17E+03 29 47 18 3. 75. A2.3 0.48 5B0 494 7. 57E+03 30 51 18 3. 75 43.2 0. 49 550 504 7.97E+03 31 55 18 3.75 44. 1 0. 50 550 .514 8.25Π+03 32 59 18 3. 75 44.9 0_5J 550 524 .8. 33E+03 33 63 18 3. 75 45.7 0. 52 550 S34 8. 39E+03 34 67 18 3.75 46. 5 0.53 550 544 8 46E+03 35 71 18 3. 75 47.2 0. 54 550 55Ί Η. 52E+03 36 75 18 3. 75 47.9 0. 55 550 564 8. 57E+03 37 79 18 3.75 48.6 0.56 550 574 8. 63E+ 03 38 83 18 3. 75 49. 3 (1. 56 .550 584 8. 68E+03 39 87 18 3.75 49.9 0. 57 550 594 8;72E+03 40 91 18 3. 75 50. 5 0; 58 550 6(M 8. 77Γ+03 41 95 18 3· 75 /51.1 0. 5S 550 614 8. 81H+03 42 99 18 3.75 51.7 0.59 5BO 624 8.85E+03 43 103 18 3.75 52.3 0. 60 550 634 8.8 8E+03 44 107 18. 3. 75 52.8 0. 60 '550 644 fi.92E+03 45 Mi 18 3. 75 53. 4 0. 61 550 654 8. 95H+03 46 I1B 18 3.75 B3.9 0. 62 550 . 664 8.98E+03 47 119 3. 75 54.4 0. 62 550 674 9. 01R+03 48 123 IR 3. 7S 5Ί.9. 0.63 550 684 i9.04E+〇n 49 127 18 3. 75 B5. 3 0. 63 5R0 694 9..07h>03 50 131 18 3. 55. 8 0. 64 550 704. 9. 10H+03 20 201144188 [Table 2-1] Table 2 — 1

Nro. t MABC h hi n (taa) (mm) (ram) (mm) (mm) (mm) (roro) (mm) 1 2. 5 150 45 46 23 140 147. 5 35 2 .. 2/5 150 45 .50 23 HO 147. 5 35 3 2. 5 150 .45 . .54 23 140 147,5 35 4 2.5 150 45 58 23 .140 147,5 ;35 5 2.5: 150 45 62 23 140 147, 5 35 6 2.5 150 45 66 23 140 147. 5 35 7 2,5 150 45 70 23 140 147.5 35. .8 2.5 150 45 74 23 140 .147. 5 35. 9 2.5 150 45 78 23 . 140 147.5 35 10 2. 5 150 45' 82 25: .140 1:47. 5 35 11 .2..5 150 45 86 23 140 147. 5 .35 12 2.5 150 45 90 23 140 147.5 35 .13 2.5 150 45 94. 23 140 147.5 35 Ϊ4 2.5 150 45 98 23 140 147. 5 35 15 2.5 150 4B 102: 23 140 147. 5 35 16 2.5 150 45 .106 23 140 147. 5 35 17 2.5 150 45 110 23 140 147; 5 35 16 2.5 iso 45 114 23 140 147. 5 35 19 2.5 150 45 118 23 140 147. 5 35 20 , 2.5 150 45 122 23 140 147; 5 35 21 2.5 150 45 126 23 140 147.5 35 22 2.5 150 45 130 23 140 147 5 35 23 2.5 150 45 134 .23 140 147.5 35 24 2.5 150 45; 138 23 140 147. 5 35 25 2.5 150. .45; 142 23 140 147. 5 35 .26 2.5 150 .45: 1 46 23 140 147. 5 35 27 2. 5 .150 45 150 23 140 147. 5 35 28 2.5 150 45 154 23 140 147_S 35 29 2. 5 180 4B 50 23 170 177. S 35 30 2. 5 180 45 . ..54 23 170 177. 5 35 31 2.5 180 45 58 23 170 177.5 35 32 2.5 180. .45. 62 23 170 177.5 35 33 2.5 Γ80 45 66 23 170 . 177, 5 35 34 2.5 180 45 70 23 170 177 B 35 35 2.5 180 45 74 23 170 177. 5 35 36 2.5 180 45 7« 23 170 177. 5 35 37 2. 5 180 45 82 23 170 177.5 35 38 2.:5 180 45 86 23 170 177. R 35 .39 2;5 Γ80 45 90 23 170 177.5 35 40 2.5 iao ..45 94 23 170 177. 5 35 41 2,5 :180 45 98 23 170 177.5 35 42 2.-5 180 45 102 23 :170 177 S 35 13 2. 5 180 . 45 106 23 170 177. S 3R 44 2. 5 ] 80 .4E5 110 23· 170 177. 5 3S 45 2.5 ) 80 4B 114 23 170 177. 5 3S 4fi 2.S 180 4B 118 .23 170 177. 5 35 47 .2. 5 :.180 45 122 23 170:. 177. 5 35... 48 2.5 180 45 126 23 170 177,5 35.. 49 .2.5 180 45 130 23 170 177: 5 3FS 50 2.5 180 45 134 : 23 170 177.5 35 Bl 2, 5 180 45 138 23 170 177. fi 35 〇 2 2.5 180 45 142 23 170 177. R 邡 53 2. 5 180 45 146 23 (70 177. 5 35 o4 : 2.5 180 ''45' 150 23 .170 177. B 3i5 55 2, 5 180 45 15:4 23 170 177. B ,.35 56 2.5 180 4Γ): 158 25 1:70 177.5 35 21 201144188 [Table 2-2] Table 2-2

No. br R dd/hl F Break and ^illiance (ran) (mm) (mm) (min) (mn>) (N/mm*·) (mb*) (k N · mm) 1 ΛΙ 18 3. 75 69.5 0.47 550 629 1.41E+04 2 45 18 3.7fi 70. 7 0. 48 550 639 1. 47E+04 3 49 18 3.75 71.9 0. 49 550 649 1. 5ΊΕ+04 4 53 18 3.75 73.0 0 49 550 659 1. 60E+04 5 57 18 3.75 74. I 0.50 550 669 Ϊ, 65K+04 6 61 18 3.75 75.2. 0. 51 B50 679 1. 66E+04 7 65 18 3.75 76.2 0.52 550 689 1.68E +04 8 69 18 3. 75 77. 3 0,52 550 699 1, 69E+04 g 73 18 3. 75 78. 3 0.53 550 709 1.7IE+04 10 77 18 3. 75 79.2 0. 54 550 719 1 72E+04 11 81 18 3.75 80.2 0. 54 550 729 1. 73K+04 12 85 18 3, 75 81. 1 0. 55 550 739 1. 74E+04 13 89 18 3.75 82.0 0.56 550 749 1.75E+04 Η 93 18 3.75 82.8 0.56 550 759 1.76E+04 15 97 18 3. 75 83. 7 0.57 550 769 , 3' 77E+04 16 101 18 3.75 84.5 0. 57 550 779 1.78E+04 17 105 18 3.75 85.3 0 , 58 550 789 1.79E+04 18 109 18 3.75 86. Γ 0. 58 550 799 1.80E+04 19 113 IB 3.75 86.8 0.59 550 809 L80E+04 20 117 18 3. 75 87.6 0.59 550 819 ;1.81E+04 21 121 18 3.7 5 88. 3 0.60 550 829 .1.82E+04 22 125 18 3.75 69. n 0. 60 550 839 i.83E Ten (VJ 23 129 18 3.75 89.7 0.61 550 849 1.83E+04 24 133 18 3.75 90.3 0. 61 5F10 859 i. 84E+04 25 ]37 18 3. 75 $JO Π. 62 550 869. Ϊ.84Ε+04 26 141 18 3.75 91.6 0. 62 550 879 1.85E+04 27 145 18 3.75 92. 3 0. 63 550 R»9 I.86E+04 28 Η9 18 3. 7f> 92.9 0. 63 550 899 1.86E+04 29 45 18 3.75 85.3 0. 48 B50 714 1.90R+04 30 sen 18 3. 75 86.5 0. 49 BRO 724 1.98E+04 31 53 )8 3.7B 87.8 0. 49 550 7.Ή 2. 06F.+01 32 57 18 3. 75 89. 0. 0. 50 550 744 Z. I2E+04 33 61. 18 3. 75 90. 2 0. 51 5B0 7R4 2. 14F.+04 34 65 .18 3. 75 91.3 0. 51 5B0 764 2.I6K+04 35 69 18 3.75 92.4 n. 52 550 774 2.18Κ+0Ί 36 73 18 3. 75 93. 5 0. 53 .5R0 7HA 2.20E+04 37 77 18 3.75 94.6 0. 53 550 794 2.21R+04 38 R1 18 3.75 9R.6 〇· M 5R0 804 2.23E+04 39 85 18 3..7S 96.6 0. M 550 814 2.24E+〇d 40 89 1H 3. 75 97.6 0. 550 824 2.25E+04 41 93 . 18 3. 7S 98.5 0.56 B50 83Ί 2.27E+04 42 97 18 3 75 99.5 0. 56 550 84Ί 2.28Η+0Ί 43 101 1R 3. 75 100.4 0. 57 .550 854 2. 2DF.+04 44 105 18 3. 75 101.3 0. R7 SB0 8B4 2.30ΜΊ 45 109 18 3.75 102. 1 0. 58 B.S0 874 2.32E+04 113 18 3,75 103. 0 0. 58 550 884 2.33E+04 *17 117 IR 3. 75 103. H 0. f>8 S50 894 2. 34E+04 4« 121 IK 3.75 0. 59 Π50 901 .2. 35H+04 ^19 125 18 3. 75 10ft. 4 0' 59 550 i)H 2. :Ϊ6Η+0Ί no 129 1H 3. 75 106. 2 0. 60 BR0 !)24 2; 37I-+0-1 51 133 IK 3. 7S 107. 0 0. 60 550 934 2. 38h>04 52 137 18 3. 75 107. 7 0. fi ] 55ft 2. 38E+0^ Γ>3 141 18 3. 75 108.5 0. 61 S50 954 2. 3 ie +CH Γ,4 ΜΗ 18 ' 3. 75 109. 2 0. fi2 550 96-1 2. Ί0Ε+04 55 Μ9 IR 3.75 109. 9 0. 62 Γ>50 974 2. Ί1Η +0Ί 56 153 18 3. 75 U0.6 0. 62 550 984 2.Ί2Ε+04 22 201144188 [Table 3-1] Table 3 — 1

No. t Η Λ BC h hi a (ram) (ram) (mm) (wro) (mm) (mm) (mm) (fam) 1 2.5 122 45 40 23 112 119. 5 35 2 2. 5. 122 45 44 23 112 119.5 35 3 2.5 122 .45 48 23 112 119,5 35 4 2.5 122 45 52 23 112 119.5 35 5 2.5 122 45 56 23 112 119. 5 35 6 2.5 122 45. 60 23 112 119.5 35. 7 2.5 122 45 64 23 112 119.5 35 8 2.5 122 45 68 23 Ϊ12 119. 5 35 9 .2.5 122 45 72 23 112 119.5 35 10 2. 5 122 45 ..76 23 112 119.5 35 11 2.5 122 45 80 23 112 119 5 35 12 2.5 122 45 84 23 112 119.5 35 13 2.5 122 45 88 23 112 119. 5 35 14 2.5 122 45 92 23 112 119.5 35 IB : 2, 5 122 45 96 23 112 119. 5 35 16 2.5 122 45 : 100 23: 112 119; 5 35 17 2.5 H2 45 104 23 112 ii9.5 35 18 2.5 122 45 108 23 112 119. 5 35 19 2.5 122 45 112 23 112 M9. 5 35 , 20 2. δ .122 45 116 23 112 119. 5 35 21 2. 5 122 .45. 120 23 112 119.5 35 22 2. 5 122 45 124 23 112 119. 5 3E) 23 15. 122 45 128 23 112 li9'5. 35 24 2.5 122 45 132 23 112 119.5 35 25 2.5 , 122 45 136 23 112 1.19. 5 35 26 2.5 122 75 50 23 .112 119. 5 65 27 2. 5 122 75 54 23 112 119. 5 65 28 2. 5 122 75 58: 23 112 Π 9. 5 65 29 2.5 122 75 62 23 112 119. 5 6B 30 2.5 122 75 66 23 112 119. 5 65 31 2.5 : 1.22 75 70 23 112 119. 5 : 65 32 2.5 122 75 74 23 112 119. 5 65 33 2. 5 122 75 78 23 112 .Π9. 5 65 34 2.5 122 75 82 23 112 H9. 5 65 35 2.5 122 75 86 23 112 i 19. 5 65 36 2,5 122 75 90 23 112 119. 5 65 37 .2.B 122 75 94 23 112 1J 9. 5 65 38 2.5 122 75 98 23 112 119. 5 65 39 2. 5 122 75 Ϊ02 23 112 119, 5 65 40 2.5 122 75: 106 23 112 119. 5 65 41. 2.5 122 75 no 23 M2 J19. 5 65 42 2.5 122 75 114 23 112 119.5 65 43 : 2.5 122 75 118 . .23 112 119.5 65 44 2,5 122 ,.75..... 122 23 112 119; B 6f> 45 2.5 m 75 126 23 112 119,5 65 ' 46 2. 5 122 75 130 23 112 119.5 65 . 47 2. 5 122 75 134 23 112 119. 5 6S: 48 2, 5 122 75 138 23 112 119. 5 65 49 2·5 122 75 . 142 23 112. 119.5 65 50 2.5 122 75 146 23 112 119, 5 65 23 201144188 [Table 3-2] Table 3-2

No. bc H dd/hl F Sectional bending strength (ron) (mn) (mm) (mm) (mm) (N/mro*·) (mm2) (k N * mm) 1 35 18 3. 75 54. 3 0.45 550 544 9.72E+03 2 39 .18 3.75 55. 5 0.46 550 554. 1.03E+04 3 43 18 3.75 56.6 0.47 550 ,f564 1.08E+04 4 47 18 3. 75 57. 7 0.48 550 574 1; 13E+04 5 51 18 3.75 58. 7 0.49 550 584 1.19E+04 6 55 18 3,75 59.8 0.50 550 594 1.24E+04 7 59 18 3,75 60,8 0.51 550 604 1.25E+ 04 8 63 18 3.75 61. 7 0. 52 550 6H 1.26F.+04 9 67 18 3. 75 62. 6 0. 52 550 624 1.27E+04 10 71 18 3.75 63, 5 0. 53 550 634 1. 28E+04 11 75 18 3. 75 64.4 0. 54 550 644 1·29E+04 12 79 18 3. 75 65.2 0.55 550 654 1. 30K+04 13 83 18 3. 75 66. 1 0.55 550 664 1. 31E +04 .14 87 18 3. 75 66. 9 0.56 550 674 1.32E+04 15 91 18 3· 75 67.6 0.57 550 684 1· 32E+04 16 95 18 3,75 68.4 0.57 550 694 1.33E+04 17 99 18 3. 75 69. 1 0. 58 550 704 i. 34E+04 18 103 18 3.75 69.8 0. 58 550 714 1.34E+04 19 107 18 3. 75 70.5 0.59 550 724 1.35E+04 20 111 18 3. 75 71.2 0.60 550 734 1.35E+04 21 115 18 3.75 71.8 0. 6 0 550 744 1.36E+04 22 119 J8 3, 75 72.4 0.61 550 754 1.36E+04 23 123 18 3.75 73. 1 0.61 550 764 1· 37E+04 24 127 18 3. 75 73.7 0. 62 550 . 774 1.37 E+04 25 131 18 3. 75 74.2 0.62 550 784 1.38E+04 26 45 18 3.75 50. 5 0.42 550 644. 1.17E+04 27 49 !R 3. 75 51. 5 0. 43 550 654 1.23E+ 04 28 53 18 3. 75 52.6 .0.44 550 664 .1.28E+04 29 57 18 3.75 53.6 0.45 550 674- 1.34E+04 30 61 18 3.75 54. 5 0,46 550 684 Ϊ.40Ε+04 31 65 18 3.75 55. 5 0.46 550 694 1.45E+04 32 69 18 3.75 56.4 0.47 550 704 33 73 18 3. 75 57.3 0.48 550 714 1.57E+04 34 77 18 3.75 58* 1 0.49 550 724 1.62E+04 35 81 18 3.75 59.0 0; 49 550 734 1.68Ε+Π4 36 85 18 3.7E> 59.8 0.50 550 744' 1.73H+0-1 37 H9 18 3. 75 . 60. 6 0.51 550 754 1. 7'4Em 38 93 18 3 75 61. 3 0.51 .550 764 I.75H+04 39 97 18 3. 75 62; 1 0. 52 550 774 1.76E+04 40 101 18 3. 75 62.8 0. 53 550 784 1.77K+04 105 18 3.75 63.5 fl. 53 550 794 1.77R+0.4 42 J09 \H 3. 75 64, 2 0. 54. 550 804 1. 78E+04 43 113 18 3.75 64. 9 0. 54 .550 814 1.79E+ 04 44 117 18 3.7f> 65.6 0. 55 550 824 1.80E+04 45 121 18 3. 75 66,2 0. B5 550 — 834 1.80E+04 46 125 18 3. 75 66. 8 0. i>fi 5R0 844 1.81E+04 47 129 ί8 3. 7i5 f>7. 5 0. 56 550 854 . J.8JE+0-1 48 133 18 3.75 6». 1 0.57 B50 H64 1.82E+04 49 137 18 3. 75 68.6 0.57 B50 8M L 82K+04 50 Hi 18 3.75 69.2 0. 58 550 884 1.83F.+04 24 201144188 [Table 4-1] L — inch 撇勉im * Rent 2 ^ t 1 9.72E+03 1 1 1.03E+04 1 1 1.08E+04 1 I 1.13H+04 I 1 1.19E+04 1 2 1 1.25E+04 1 1 1.26E+04 1 1 1.27E+04 1 L 1.28E+04 I 1 1.29 E+04 1 1 1.30E+04 1 1 1.31E+04 I 1 1.32E+04 1 1 1.32E+04 1 £ cri n 1 1.34E+04 1 1 1.34E+04 I 1 1.35E+04 1 L_l 35E+04 I 1 1.36E+04 1 1 1.36R+04 1 1 1.37E+04 I 1 1.37E+04 1 I 1.38E+04 1 1 8.33H+03 1 I 8. 76H+03 I 1 9.20 H+03 1 ! 9.63E+03 1 i 9. 99E+03 1 1 1.01E+04 1 S 1.03E+04 1 mr7: 聒i Μ ^ inch tc s ΙΛ f£> 1Λ K s iT3 ΤΓ Oi tA s iO TP rr CVJ (£><£> i£} in K〇(C <£>t£> ac to s iO g ΤΓ C3 r- ^3* 1ft ΤΓ CD r- oc 00 ? VC m iX> c cc 'T tc σ> Irt U. ^ 5 s K2 a IA in 〇ΚΛ in g in s Ui g in s LO g io sm S in s in o in IO C U3 ΙΛ 〇in ΚΛ g xn o in ΙΩ s IA s tA § in g in o IO ΙΛ s »Λ s LT3 cm ift c in ΙΛ S LA c 1C u: s 1Λ c 5 s to s 1C s 1C o ΙΛ LO ―-S of IL〇c <〇rp 〇O 00 o σ> rr ogc LA o csi u> c C4 U3 o CO ΙΩ 〇^r LC o LA ΙΛ ifLA if: C ifi 〇K o K o cc ΙΛ C 00 tn o σ> ΙΩ Ο § csc to o 〇 04 (C c eg <·〇o IO TP C c OC 〇5 O se ΙΛ oc CVJ ΙΛ c -1 CO s LO in LA to (〇in 卜 5 00 in 00 Oi U) 00 s 卜 <P <c CM (C tn CO UD s <N 1C 1 (C US Φ <c fO £ 00 i〇Φ to 00 O) f〇ΙΑ C Bu CM 卜 卜 n Bu CO Csi 1C 1ft in 卜&lt ;£> in cc oc CC in CO a IO 00 s 00 卜-3 in n U5 n io c〇L« rt in c〇U3 rt US 卜 n Ln eo s CO l〇CO tc CO ΙΛ CO 1C n In ri LA CO in λ U: C5 tn in CO IO «*3 in CO tfl n 1C n tc LC CO CO ec n rj rt CO ^ 1 oe CO 00 00 oc a〇00 00 00 00 00 00 00 00 OC Ao 00 G 〇 GO i i O O i O O O Cn s two in σ> CO ca 芑5 § 5 CM tc VO to ss 00 to π J in n LA C3 IA C3 IA ro IA CO in m 1ft Λ to CD 1ft IO CO IA CO ΙΛ n tA ri U3 e〇 Ui C5 U5 rt in rt IO CO to n U3 C3 u: n U2 C5 in r〇LT3 CO in rj sss ft s 2-1 in 2 in 2 U2 Cft LA Oi ΙΛ σ> «•H ia φ ΙΛ Ο) tn 05 1 Ω Φ Ifi 2 LC 05 tA σ > IA a> in Φ LC 〇 > 1A 2 io 2 in Oi LA 03⁄4 LA Oi IC O) ΙΛ σ > us Oi ΙΛ a iii 05 g § g § § s 1 c - ΐ C^J <SJ eg CVJ CSI <N CM C3 CSJ CM CNJ C>i C>i Csi w 守rr ^5* c (inm) CTD ca C*5 CO CJ n ca CO CSJ CO η ca CO Wn C-9 CO CO CO CO cn C*3 DJ C3 M CO CVJ CO Λ C«i CO C-5 c<» cs <n cs c〇CVI CO CM CO CM CO ΓΊ CO CJ nc〇CM C5 CO CO CM CO CJ Λ CM »1 § 5 « C«) ut (O IO ss 00 1 to § ΤΓ 00 00 00 CM Oi O) ooss CV3 (£ s CM ac CM CQ CO (O CO ^3* • V oo M i n (C tc § s 00 (0 N <1 1Λ us tn ^r tn ^r in US '«r IO ΙΛ U9 ΙΛ IA IA rr m 1A tA u: ^3* IO ΙΛ U5 ΤΓ 1C ΙΛ rr in ΤΓ 1C U3 ΤΓ ΙΛ X* IO m LO l〇ΙΛ IA LA =1 CNJ cm a CM ca ca CNJ CVJ C>J CSJ ca CM C>J 03 eg CNJ ca CSJ eg CM cq eg Cvj W CM CJ cs CM CO CO Ca ca C3 CM eg CO cs CM CM CSJ eg CJ eo CNJ C\J <N CM CJ CM CM -1 ΙΛ Csi lA CM LO P>3 in OJ in CNJ 1A M in eg Li*3 CSI ΙΛ (N l 〇<N ΙΛ ΙΛ ΙΛ CM ΙΛ CM in eg m CSJ tn CM IO CsJ IO CSJ ΙΛ CM 1Ω CM in CM ΙΛ N in eg IA <N CM C«J eg CM Cvi " CJ 00 'β* in CO R- GO Oi 〇CM CO i£i U3 00 03⁄4 s CM C^J CO Cvi ΤΓ CM 1C tc CNJ sd ca W n C-5 n 25 201144188 [Table 4-2]

F-ϋ- ΚΗΗϋϋ fi sis S+3S 5+ even 6 s+--6 sis -^-=+398 f 3-8 s ten 3S sis sis s+-[ S+HI one sis s+sl δί6ϋ s+so Sis S+HS S+H90 sis sis sis sis (s ϋ I il ιη9ϋ1 il ε§ i 10-S86 696 ii Is i 6*8 εε § is -9 i § ss i 9 卜 e § 2S 9S Hs § -s As shown in the graphs of Fig. 7 to Fig. 9, when the neutral axis X is located at the center in the height direction of the web 11 (d/hl = 0.5), the intensity becomes extremely large, and the d/hl is large. 201144188 The strength is reduced at 0.5 or less than 0.5. Moreover, the range of the neutral axis position which can ensure the strength of about 90% or more of the maximum strength is the above formula (3)' and can ensure about 95% of the maximum strength. The range of the above-described intensity neutral axis X position is expressed by the above formula (4). Conversely, in order to adjust the width dimension B of the lower blade 13, the equation or the equation (4) neutral axis X position 'flat portion 21 The width dimension 6 satisfies the following formula (3') or formula (4'), and g(d) in the formula is a function of 廿 represented by the formula (7). a + R+t/2$ b$g ( 〇.6〇h) ......(3,) g ( 〇.475h) ( 0.55h) ......(4,) g(d) = {h(h/ 2 + R) + bhl + 〇.363R+2u(h+ 1.637R) + c(R+h —c/2) } / { hi — d } - (h + b + c + 3u) + R + t/ 2 (7) As described above, the strength of about 90% of the maximum strength can be ensured by satisfying the formula (3) or the formula (3). Further, the satisfaction formula (sentence or formula) is used. 4)), the strength of about 95% or more of the maximum strength can be ensured, and the bending strength can be maintained by thinning the thickness as described above, and the weight of the joists 18 and 28 can be reduced. The above-described embodiment includes the other configuration and the like which can achieve the object of the invention. The following modifications and the like are also included in the present invention. For example, in the above embodiment, the girders 8 are used at 55 MPa and 700 MPa. The drop strength f of the materials of 18 and 28 is described as an example. However, the fall strength is not limited to 55 MPa to 700 MPa. Further, the fall strength F is not limited to the standard strength', and may be set according to the actual strength. 201144188 In the above embodiment, the thickness t of the joists 8, 18, and 28 is described as a constant cross section. However, it is not limited thereto. A section having a thickness variation depending on the location of the beam. Further, in the above embodiment, the joists 8, 18, and 28 are formed by bending or roll forming. However, the joists may be formed by combining a plurality of sheets and welding and joining them. Other preferred embodiments, methods, and the like for carrying out the invention are disclosed in the above description, but the invention is not limited thereto. That is, the main specific embodiments of the present invention have been specifically illustrated and described, but the embodiments described above are in the form of shapes, materials, quantities, and others without departing from the technical spirit and objects of the present invention. The detailed composition is well known to those skilled in the art when various modifications are possible. Therefore, the description of the shapes, materials, and the like described above is intended to be illustrative of the present invention, and the present invention is not limited thereto. Therefore, the description of the names of members which are limited to one part or all of the restrictions such as the shape, the material, and the like is included in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a part of a container for cargo according to an embodiment of the present invention. Fig. 2 is an enlarged sectional view showing a joist of a bottom pad of the container for cargo of Fig. 1. Fig. 3 is a cross-sectional view showing the joist of the first embodiment of the container for cargo. Fig. 4 is a cross-sectional view showing the joist of the second embodiment of the container for cargo. 28 201144188 Figure 5 is a cross-sectional view showing the joist of the comparative example. Fig. 6 is a graph showing the results of analysis of the examples and comparative examples. Figure 7 is a graph showing other analysis results. Figure 8 is a graph showing other analysis results. Figure 9 is a graph showing other analysis results. [Description of main component symbols] 1...Container container 19...Bending portion 2...Bottom pad 20...Flat portion 3...Side panel 21...Flat portion 4... Before and after Panel 22...open end 5... corner post 28... joist 6··. corner fitting 800... joist 7... top panel 811... web 8... joist 812 ... upper wing 9... floor surface 813... lower wing 10... bottom side hold A... upper wing width dimension 11... web B·.· lower wing The width of the flat portion 12... upper wing 13] lower wing C... upper lip lip length 14... upper lip H... web height dimension 15... bend Folding portion R... Center radius 16 of the thickness of the bent portion... Bending portion X... Neutral axis 17... Flat portion a... Width of the flat portion of the upper wing plate 18... Flat section 29 201144188 b···The width of the flat part of the lower wing plate h..J The height dimension of the flat surface of the board is the height of the height of the upper and lower wings. C...The upper lip The length of the flat portion is different from the inch t... the thickness of the plate is d... the distance between the center of the upper plate and the neutral axis of the upper plate U... the central axis of the plate thickness of the bent portion is 30

Claims (1)

201144188 VII. Patent application scope: L—a container for goods, comprising: a rectangular bottom plate; a pair of side panels and a pair of front and rear panels, which are erected from the 4 sides of the bottom pad; the corner posts are erected on The corner portion of the bottom pad is connected to each side edge portion of the side panel and the front and rear panels; and the top panel is connected to the upper edge panel and the upper edge of the front and rear panels, and is characterized in that: The container includes a pair of bottom side rails disposed along each of the lower end edges of the pair of side panels, and the bottom sill has a plurality of joists that are disposed between the pair of bottom side rails and are disposed on the plurality of joists The floor surface material on the joists has a web extending substantially parallel to the extending direction of the corner post when the joist is viewed in a plane cross section, and the extending direction from the web end and the bottom side is substantially Extending the upper wing in parallel, opposite to the upper wing plate, and extending from the lower end of the web to the extending direction of the bottom side, the blade is extended substantially parallel to the extending direction of the corner column Substantially parallel from the distal end of the blade extends downward over the lip. 2. The container for goods according to the ninth aspect of the patent application, wherein the width dimension of the flat portion of the upper wing in the front beam meets the following formula by the thickness dimension t of the plate and the lodging strength F of the material ( 1): 240t / (VF) < a ^ 740t / (VF) ... (1), 31 201144188 Here, the unit of the width dimension a is mm, and the unit of the thickness dimension t is mm. The unit of the lodging strength F is MPa. 3. The container for goods according to claim 1 or 2, wherein in the aforementioned joist, the width of the lower wing is larger than the width of the upper wing. 4. The container for goods according to claim 1 or 2, wherein in the cross section of the joist, a distance d between the neutral axis of the web and the center of the thickness of the upper wing plate, and the foregoing The relationship of the height dimension h of the flat portion of the web satisfies the following formula (2): 0.45 h ^ d ^ 0.60 h (2). 5. The container for goods of claim 1 or 2, wherein in the joist, 'the following formula (3) is used by the thickness dimension t, the material's lodging strength F, and the width dimension A of the upper wing When the constant Μ is calculated, the length C of the upper lip portion when viewed in a cross section perpendicular to the extending direction of the joist is satisfied by the constant Μ, the thickness t of the thickness, and the lodging strength F of the material. Equation (4): M = max[2.8t{ (A/t)2-28000/F }1/6, 4.8t]...(3), M^C^240t/(VF (4), where the unit thickness dimension t is mm, the unit of the lodging strength F is MPa', and the unit of the width dimension A of the upper blade is mm. 32