WO2021112629A1

WO2021112629A1 - Truss mechanism steel pipe beam

Info

Publication number: WO2021112629A1
Application number: PCT/KR2020/017675
Authority: WO
Inventors: 박대열; 장솔
Original assignee: 주식회사 스틸코리아
Priority date: 2019-12-05
Filing date: 2020-12-04
Publication date: 2021-06-10
Also published as: KR102114593B1

Abstract

A power control system for amphibious mobility according to the present invention comprises a land-driving wheel and a water-driving propeller. When the land-driving wheel and the water-driving propeller are driven at a predetermined rotational speed ratio, if the rotational speed ratio of the land-driving wheel and the water-driving propeller changes, the driving force is increased for whichever, between the land-driving wheel and the water-driving propeller, that has a reduced rotational speed.

Description

Truss Base Steel Pipe Beam

The present invention relates to a truss-based steel pipe beam, and more particularly, to a steel pipe beam in which a vertical reinforcing plate and an inclined reinforcing plate are applied therein.

A beam used as a structural beam is generally processed and welded with an I-shaped cross-section or an H-shaped cross-section, or formed and manufactured as a roll-beam.

1A shows an example of such a beam.

When describing a structural beam as an example with a girder for a bridge, the beam 10 shown in FIG. 1A is made of a steel plate beam, and the upper flange 11, the web 12 and the lower flange 13 The upper flange 11 and the lower flange 13 and the web 12 are coupled to each other by welding and injection molding.

In order to increase the rigidity of the beam itself without increasing the height of the bridge, the U-shaped channel 20 is installed in the vertical center of the beam 10, which is structurally inefficient because it moves the neutral axis to the center of the beam. This was pointed out.

In addition, the vertical stiffener 30 generally installed in the beam 10 can be seen in FIG. 1b, which is usually referred to as a vertical stiffener.

These vertical stiffeners 30 are mainly installed to prevent local buckling in the transverse direction, and the distance between the vertical stiffeners 30 as they are spaced apart from each other in the longitudinal direction becomes an effective span for local buckling.

Although it is desirable to optimize (minimize) such an effective span, the vertical reinforcement 30 usually uses a thin plate as a steel material, so there is a problem that there is no choice but to limit the optimization.

In addition, the vertical reinforcing material 30 is also a portion to which the transverse beam 40 is connected, as shown in FIG. 1c , and in order to connect the vertical stiffener 30 and the transverse beam 40, a plurality of auxiliary materials 41, gusset plates, etc.) This also had a problem in that a cost increase factor occurred in the construction of the beam.

Furthermore, in order to increase the bending rigidity of the beam 10, an additional backing plate 50 is installed on the bottom surface of the lower flange 13 of the beam 10 as shown in FIGS. 1D and 1E, or the lower flange 13 thickness (t) ) is increased, but there is a problem that there is no choice but to limit the increased beam bending stiffness.

An object of the present invention for solving the above problems is to provide a steel pipe beam to which a vertical reinforcing plate and an inclined reinforcing plate are applied.

In order to achieve the above object of the present invention, a steel pipe beam according to an embodiment of the present invention includes a hollow steel pipe, a plurality of vertical stiffeners positioned perpendicular to the longitudinal direction of the steel pipe while in contact with the inner surface inside the steel pipe, and and an inclined reinforcing material in contact with the inner surface of the steel pipe and the vertical reinforcing material between adjacent vertical reinforcing materials among the plurality of vertical reinforcing materials, wherein the inclined reinforcing material forms an acute angle between the included angle with the inner surface of the steel pipe and the included angle with the vertical reinforcing material can be reached

The cross-sectional shape of the steel pipe may be circular, oval, or polygonal.

A reinforcing material may be further included on the outer surface of the steel pipe.

The plurality of vertical reinforcing materials may have a first vertical reinforcing member positioned at a longitudinal center of the steel pipe, and may be positioned in a symmetrical structure with respect to the first vertical reinforcing member in both end directions of the steel pipe.

In one example, the inclined stiffener includes a central inclined stiffener in contact with the first vertical stiffener, a distal end inclined stiffener positioned at both ends in the longitudinal direction of the steel pipe, and an intermediate portion positioned between the central inclined stiffener and the distal end inclined stiffener. and an inclined reinforcing material, wherein the central inclined reinforcing material may be in contact with the first vertical reinforcing material at a portion of the first vertical reinforcing material that is in contact with the upper portion of the inside of the steel pipe.

The intermediate inclined reinforcing material and the distal end inclined reinforcing material may be positioned in the same inclination direction as the central inclined reinforcing material in both longitudinal ends of the steel pipe with respect to the first vertical reinforcing material.

The intermediate inclined reinforcing material and the distal end inclined reinforcing material may be positioned in a different inclination direction from the adjacent inclined reinforcing material.

The distal end portion of the inclined stiffener may be positioned in the same inclination direction as the central inclined stiffener, and the intermediate portion of the inclined stiffener may be positioned in a different inclination direction from the central inclined stiffener.

In another example, in the inclined reinforcing plate, the inclined reinforcing material is a central inclined reinforcing material in contact with the first vertical reinforcing material, a distal end inclined reinforcing material positioned at both ends in the longitudinal direction of the steel pipe, and the central inclined reinforcing material and the distal end inclined reinforcing material It includes an intermediate inclined reinforcement positioned between, the central inclined reinforcement may be in contact with the first vertical reinforcement at a portion of the first vertical reinforcement in contact with the lower portion of the inside of the steel pipe.

The distal part inclined reinforcement may be positioned in a different inclination direction from the central inclined stiffener, and the intermediate inclined stiffener may be positioned in the same inclined direction as the central inclined stiffener.

In another example, the vertical reinforcing material and the inclined reinforcing material may be steel.

The inclined reinforcing material may be at least one selected from the group consisting of a plate material, a section steel, a steel bar, and a steel pipe.

Since the steel pipe beam with reinforced rigidity according to the embodiment of the present invention uses a sloped reinforcing material, the flow of the load is evenly distributed to avoid the concentration of stress, so that it can be used as a long span. That is, when the steel pipe beam of the present invention is used, the bending rigidity, buckling and deflection of the beam are reduced, and the cross-sectional performance is increased, so that structurally improved durability of the beam, long-span length and low-type solidification can be achieved. Construction may be possible through fabrication.

1A to 1E show examples of conventional steel beams with reinforced rigidity.

2 is an internal schematic view of a steel pipe beam according to Embodiment 1 of the present invention.

3 is an internal schematic view of a steel pipe beam according to a second embodiment of the present invention.

4 is an internal schematic view of a steel pipe beam according to a third embodiment of the present invention.

5 is an internal schematic view of a steel pipe beam according to Embodiment 4 of the present invention.

6A to 6C are schematic diagrams showing an installation shape of a steel pipe beam and a simulation result according to a comparative example of the present invention.

7A to 7C are schematic views showing the installation shape and simulation results of the steel pipe beam according to Example 1 of the present invention.

8A to 8C are schematic views showing the installation shape and simulation results of the steel pipe beam according to Example 2 of the present invention.

9A to 9C are schematic diagrams showing an installation shape of a steel pipe beam and simulation results according to Example 3 of the present invention.

10A to 10C are schematic diagrams illustrating an installation shape of a steel pipe beam and a simulation result according to Example 4 of the present invention.

11A to 11C are schematic diagrams showing the installation shape of the steel pipe beam and the simulation result according to Example 5 of the present invention.

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, and the embodiments of the present invention may be embodied in various forms. It should not be construed as being limited to the embodiments described in .

Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms may be used for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle. Other expressions describing the relationship between elements, such as "between" and "immediately between" or "neighboring to" and "directly adjacent to", etc., should be interpreted similarly.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, and is intended to indicate that one or more other features or numbers are present. , it is to be understood that it does not preclude the possibility of the presence or addition of steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as meanings consistent with the context of the related art, and unless explicitly defined in the present application, they are not to be interpreted in an ideal or excessively formal meaning. .

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

2 is a schematic diagram of a steel pipe beam according to Example 1 of the present invention.

Referring to FIG. 2 , the steel pipe beam includes a hollow steel pipe 110 , a plurality of vertical stiffeners 120 and a plurality of vertical stiffeners positioned perpendicular to the longitudinal direction of the steel pipe 110 while in contact with the inner surface inside the steel pipe 110 . Among 120 , the inclined reinforcement 130 in contact with the inner surface of the steel pipe 110 and the vertical reinforcement 120 between the adjacent vertical reinforcement 120 may be included.

The inclined reinforcing material 130 may form an acute angle between the included angle with the inner surface of the steel pipe 110 and the included angle with the vertical reinforcing material 120 .

Although the cross-sectional shape of the steel pipe 110 is shown in a circular shape in FIG. 2 , it is not limited thereto, and any cross-sectional shape is possible as long as it has a hollow structure. As a non-limiting example, the cross-sectional shape of the steel pipe 110 may be circular, oval, or polygonal. Examples of the polygon include, but are not limited to, a quadrangle, a hexagon, an octagon, and the like.

The plurality of vertical reinforcing materials 120 includes a first vertical reinforcing material 121 positioned at the longitudinal center of the steel pipe 110, and symmetrical in the direction of both ends of the steel pipe 110 with the first vertical reinforcing material 121 as a center. structure can be formed.

In the present invention, although it is shown that the plurality of vertical reinforcements 120 are arranged at equal intervals, the present invention is not limited thereto, and the spacing between the vertical reinforcements 12 may be configured differently in some cases.

The inclined reinforcing material 130 may be formed in a different inclination direction from the adjacent inclined reinforcing material 130 .

As the vertical reinforcing material 120 and the inclined reinforcing material 130 reinforce the steel pipe 110 , the load distribution becomes uniform, and the tensile force and the compressive force can be effectively distributed according to the arrangement shape of the inclined reinforcing material 130 .

It is obvious that it is not limited only to the form shown in FIG. 2 , and it is also possible if the inclination direction of each inclined reinforcement 130 is opposite to the direction shown in FIG. 2 .

In addition, although not shown, a reinforcing material may be additionally formed on the outer surface of the steel pipe 110 .

3 is a schematic diagram of a steel pipe beam according to a second embodiment of the present invention.

Referring to FIG. 3 , the steel pipe beam includes a hollow steel pipe 210 , a plurality of vertical stiffeners 220 and a plurality of vertical stiffeners positioned perpendicular to the longitudinal direction of the steel pipe 210 while in contact with the inner surface of the steel pipe 210 . Among 220 , the inclined reinforcement 230 in contact with the inner surface of the steel pipe 210 and the vertical reinforcement 220 between the adjacent vertical reinforcement 220 may be included.

The inclined reinforcing material 230 may form an acute angle between an included angle with the inner surface of the steel pipe 210 and an included angle with the vertical reinforcing material 220 .

The plurality of vertical reinforcing materials 220 includes a first vertical reinforcing material 221 positioned at the longitudinal center of the steel pipe 210, and symmetrical in the direction of both ends of the steel pipe 210 with the first vertical reinforcing material 221 as a center. structure can be formed.

In the present invention, although a plurality of vertical reinforcement 220 is expressed at equal intervals, it is not limited thereto, and the spacing between the vertical reinforcement 220 may be configured differently in some cases.

The inclined reinforcing material 230 is a central inclined reinforcing material 231 located on both sides of the first vertical reinforcing material 221 while in contact with the first vertical reinforcing material 221, and a distal end inclined reinforcing material located at both ends in the longitudinal direction of the steel pipe 210 ( 233) and an intermediate inclined reinforcement 232 positioned between the central inclined stiffener 231 and the distal end inclined stiffener 233.

The central inclined reinforcing material 231 may be in contact with the first vertical reinforcing material 221 at a portion where the first vertical reinforcing material 221 is in contact with the upper portion of the inside of the steel pipe 210 . The intermediate inclined reinforcing material 232 and the distal end inclined reinforcing material 233 may be formed in the same inclination direction as the central inclined reinforcing material 231 in the longitudinal direction of both ends of the steel pipe 210 around the first vertical reinforcing material 221. have.

Since other configurations are the same as those of the first embodiment, overlapping descriptions will be omitted.

4 is a schematic diagram of a steel pipe beam according to a third embodiment of the present invention.

Referring to FIG. 4 , the steel pipe beam includes a hollow steel pipe 310 , a plurality of vertical stiffeners 320 and a plurality of vertical stiffeners positioned perpendicular to the longitudinal direction of the steel pipe 310 while in contact with the inner surface of the steel pipe 310 . Among the 320 , the inclined reinforcement 330 in contact with the inner surface of the steel pipe 310 and the vertical reinforcement 320 between the adjacent vertical reinforcement 320 may be included.

The inclined reinforcing material 330 may form an acute angle between an included angle with the inner surface of the steel pipe 310 and an included angle with the vertical reinforcing material 320 .

The plurality of vertical reinforcing materials 320 includes a first vertical reinforcing material 321 positioned at the longitudinal center of the steel pipe 310, and symmetrical in the direction of both ends of the steel pipe 310 with the first vertical reinforcing material 321 as the center. structure can be formed.

In the present invention, although a plurality of vertical reinforcement 320 is expressed at equal intervals, it is not limited thereto, and the spacing between the vertical reinforcement members 320 may be configured differently in some cases.

The inclined reinforcing material 330 is a central inclined reinforcing material 331 located on both sides of the first vertical reinforcing material 321 while in contact with the first vertical reinforcing material 321, and the distal end inclined reinforcing material located at both ends in the longitudinal direction of the steel pipe 310 ( 333) and an intermediate inclined reinforcement 332 positioned between the central inclined stiffener 331 and the distal end inclined stiffener 333.

The central inclined reinforcing material 331 may be in contact with the first vertical reinforcing material 321 at a portion where the first vertical reinforcing material 321 is in contact with the lower portion of the inside of the steel pipe 310 . The intermediate inclined reinforcing material 332 and the distal end inclined reinforcing material 333 may be formed in the same inclined direction as the central inclined reinforcing material 331 in the longitudinal direction of both ends of the steel pipe 310 around the first vertical reinforcing material 321. have.

5 is a schematic diagram of a steel pipe beam according to a fourth embodiment of the present invention.

Referring to FIG. 5 , the steel pipe beam includes a hollow steel pipe 410 , a plurality of vertical stiffeners 420 and a plurality of vertical stiffeners positioned perpendicular to the longitudinal direction of the steel pipe 410 while in contact with the inner surface of the steel pipe 410 . Among the 420, the inclined reinforcement 430 in contact with the inner surface of the steel pipe 410 and the vertical reinforcement 420 between the adjacent vertical reinforcement 420 may be included.

The inclined reinforcing material 430 may form an acute angle between an included angle with the inner surface of the steel pipe 410 and an included angle with the vertical reinforcing material 420 .

The plurality of vertical reinforcing materials 420 includes a first vertical reinforcing material 421 positioned in the longitudinal center of the steel pipe 410, and symmetrical in the direction of both ends of the steel pipe 410 with the first vertical reinforcing material 421 as the center. structure can be formed.

In the present invention, a plurality of vertical reinforcement 420 is expressed at equal intervals, but is not limited thereto, and in some cases, intervals between the vertical reinforcement 420 may be configured differently.

The inclined reinforcing material 430 is a central inclined reinforcing material 431 located on both sides of the first vertical reinforcing material 421 while in contact with the first vertical reinforcing material 421, and a distal end inclined reinforcing material located at both ends in the longitudinal direction of the steel pipe 410 ( 433) and an intermediate inclined stiffener 432 positioned between the central inclined stiffener 431 and the distal end inclined stiffener 433.

The central inclined reinforcing material 431 may be in contact with the first vertical reinforcing material 421 at a portion in which the first vertical reinforcing material 421 is in contact with the lower portion of the inside of the steel pipe 410 . The intermediate inclined reinforcing material 432 may be formed in the same inclination direction as the central inclined reinforcing material 431 in the longitudinal direction of both ends of the steel pipe 410 around the first vertical reinforcing material 421 . In FIG. 5 , it is illustrated that only one intermediate inclined reinforcement 432 is formed on both sides, but it is obvious that a plurality of intermediate inclined reinforcement 432 may be formed according to the length of the steel pipe 410 . The distal end inclined reinforcing plate 433 may be formed in a different inclination direction from the central inclined reinforcing plate 431 .

Structural analysis

MIDAS structural analysis of the steel pipe beam according to Examples 1 to 4 described with reference to the drawings, the steel pipe beam according to Example 5 in which an external reinforcement is added to the steel pipe beam of Example 2, and the steel pipe beam of a comparative example without using a reinforcement Structural analysis was performed using the program, and the results are shown in Table 1 below.

The structural analysis was carried out with Ⅸ609.16 * 16t, a span of 50m, and an applied load of 8kN/m.

6a to 11c are schematic diagrams of a steel beam in the case of 'Xa', a schematic diagram showing the generated moment result in the case of 'Xb', and a schematic diagram showing the deflection result in the case of 'Xc'. Here, 'X' is an integer from 6 to 11.

Referring to Table 1, it can be seen that the maximum moment of the steel pipe beams of Examples 1 to 5 according to the present invention is greatly reduced compared to the steel pipe beams of Comparative Examples. This is judged as a result of properly dispersing the stress of the vertical reinforcement and the inclined reinforcement, which are the components of the present invention.

As described above, although preferred embodiments of the present invention have been described with reference to the drawings, those of ordinary skill in the art will present the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. It will be understood that various modifications and changes are possible.

110, 210, 310, 410: steel pipe

120, 220, 320, 420: vertical reinforcement

130, 230, 330, 430: Inclined reinforcement

Claims

hollow steel pipe;

a plurality of vertical reinforcing materials positioned perpendicular to the longitudinal direction of the steel pipe while being in contact with the inner surface of the steel pipe; and

an inclined reinforcing material in contact with the inner surface of the steel pipe and the vertical reinforcing material between adjacent vertical reinforcing materials among the plurality of vertical reinforcing materials;

including,

The inclined reinforcing material is in contact so that the included angle with the inner surface of the steel pipe and the included angle with the vertical reinforcing material form an acute angle,

The plurality of vertical reinforcement,

A first vertical reinforcing material is located in the longitudinal center of the steel pipe,

Positioned in a symmetrical structure in the direction of both ends of the steel pipe around the first vertical reinforcement,

The inclined reinforcing material includes a central inclined reinforcing material in contact with the first vertical reinforcing material, a distal end inclined reinforcing material positioned at both ends in the longitudinal direction of the steel pipe, and an intermediate inclined reinforcing material positioned between the central inclined reinforcing material and the distal end inclined reinforcing material. ,

The central inclined reinforcing member is a steel pipe beam, characterized in that the first vertical reinforcing member is in contact with the first vertical reinforcing member at a portion in contact with the upper portion of the inside of the steel pipe.
The method of claim 1,

The steel pipe beam, characterized in that the cross-sectional shape of the steel pipe is circular, oval or polygonal.
The method of claim 1,

Steel pipe beam, characterized in that it further comprises a reinforcing material on the outer surface of the steel pipe.
The method of claim 1,

The intermediate inclined reinforcing material and the distal end inclined reinforcing material are positioned in the same inclination direction as the central inclined reinforcing material in both longitudinal ends of the steel pipe with respect to the first vertical reinforcing material.
The method of claim 1,

The intermediate inclined stiffener and the distal end inclined stiffener are positioned in a different inclination direction from the adjacent inclined stiffener.
The method of claim 1,

The distal end inclined reinforcement is located in the same inclined direction as the central inclined reinforcement,

The intermediate inclined stiffener is a steel pipe beam, characterized in that it is positioned in a different inclination direction from the central inclined stiffener.
hollow steel pipe;

a plurality of vertical reinforcing materials positioned perpendicular to the longitudinal direction of the steel pipe while being in contact with the inner surface of the steel pipe; and

an inclined reinforcing material in contact with the inner surface of the steel pipe and the vertical reinforcing material between adjacent vertical reinforcing materials among the plurality of vertical reinforcing materials;

including,

The inclined reinforcing material is in contact so that the included angle with the inner surface of the steel pipe and the included angle with the vertical reinforcing material form an acute angle,

The plurality of vertical reinforcement,

A first vertical reinforcing material is located in the longitudinal center of the steel pipe,

Positioned in a symmetrical structure in the direction of both ends of the steel pipe around the first vertical reinforcement,

The inclined reinforcing material includes a central inclined reinforcing material in contact with the first vertical reinforcing material, a distal end inclined reinforcing material positioned at both ends in the longitudinal direction of the steel pipe, and an intermediate inclined reinforcing material positioned between the central inclined reinforcing material and the distal end inclined reinforcing material. ,

The central inclined reinforcing member is a steel pipe beam, characterized in that the first vertical reinforcing member is in contact with the first vertical reinforcing member at a portion in contact with the lower portion of the inside of the steel pipe.
8. The method of claim 7,

The intermediate inclined reinforcing material and the distal end inclined reinforcing material are positioned in the same inclination direction as the central inclined reinforcing material in both longitudinal ends of the steel pipe with respect to the first vertical reinforcing material.
8. The method of claim 7,

The intermediate inclined stiffener and the distal end inclined stiffener are positioned in a different inclination direction from the adjacent inclined stiffener.
8. The method of claim 7,

The distal end slanted reinforcement is located in a different slanted direction from the central slanted stiffener,

The intermediate inclined reinforcing member is a steel pipe beam, characterized in that it is positioned in the same inclination direction as the central inclined reinforcing material.
8. The method of claim 1 or 7,

The steel pipe beam, characterized in that the vertical reinforcing material and the inclined reinforcing material are steel.
12. The method of claim 11,

The inclined reinforcing material is a steel pipe beam, characterized in that at least one selected from the group consisting of a plate material, a section steel, a steel bar and a steel pipe.