KR102609977B1 - Hollow shape steel pipe girder used in bridge structure - Google Patents

Abstract

A hollow steel pipe girder according to various embodiments of the present disclosure includes: a hollow steel pipe body having an upper flat portion and a lower curved portion; Includes a first leaf spring and a second leaf spring installed in the hollow of the steel pipe body, respectively on the left and right sides with respect to the center of the steel pipe body, wherein the first leaf spring and the second leaf spring are of the steel pipe body. It can be curved towards the center. Various other embodiments are possible.

Description

Hollow steel pipe girder used in bridge structures {HOLLOW SHAPE STEEL PIPE GIRDER USED IN BRIDGE STRUCTURE}

This disclosure relates to hollow steel pipe girders used in bridge structures.

Steel pipe girders used in bridge structures serve to support the bridge deck. Conventional steel pipe girders are filled with concrete in a fan-shaped cross-sectional shape, as disclosed in Korean Patent Publication 10-1725686 (April 5, 2017). It consists of an upper filling part and a lower filling part, and a first side pipe and a second side pipe arranged on the left and right sides and bolted to the upper filling part and the lower filling part to form a circular steel pipe.

This type of steel pipe girder is equipped with an upper and lower filling section filled with concrete, which can strengthen the bending rigidity of the steel pipe. However, the upper and lower filling sections are manufactured separately and then bolted to the first and second side pipes. Because it is assembled, the structure is complex and manufacturing costs increase.

As a conventional bridge support is disclosed in Registered Patent Publication No. 10-1117302 (February 9, 2012), a bridge support is installed between the upper plate and the lower plate, the bridge support is equipped with a negative reaction force device, and the negative reaction device is Guide slits and guide protrusions are formed to enable horizontal movement.

However, since such a conventional bridge bearing has a structure in which a guide protrusion is inserted into a guide slit and moves in a sliding manner, wear occurs due to friction due to repeated movement, and as a result, the lifespan of the bridge bearing is shortened and the precision of the bridge bearing is lost due to wear. There is a risk that problems may occur with the bridge due to the failure of the supports.

The present disclosure seeks to provide a structure for overcoming problems caused by imbalance of vibration, load, and stress within the cross section of the girder in a hollow girder using a hollow steel tube.

In addition, the present disclosure seeks to provide a structure in which the height of the bridge becomes thinner from both ends toward the center when building a bridge using hollow girders, thereby saving raw materials and securing aesthetics.

The technical problem to be achieved in this document is not limited to the above-mentioned technical problem, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. .

A hollow steel pipe girder according to various embodiments of the present disclosure includes: a hollow steel pipe body having an upper flat portion and a lower curved portion; Includes a first leaf spring and a second leaf spring installed in the hollow of the steel pipe body, respectively on the left and right sides with respect to the center of the steel pipe body, wherein the first leaf spring and the second leaf spring are of the steel pipe body. It can be curved towards the center.

1 is a perspective view of a hollow steel pipe girder according to an embodiment of the present disclosure.
Figure 2 is a cross-sectional view of a hollow steel pipe girder according to an embodiment of the present disclosure.
Figure 3 is a cross-sectional view of a hollow steel pipe girder according to an embodiment of the present disclosure.
Figure 4 is a side view of a hollow steel pipe girder according to an embodiment of the present disclosure.
Figure 5 is a cross-sectional view of a bridge on which a hollow steel pipe girder is installed according to an embodiment of the present disclosure.
Figure 6 shows a process for manufacturing a hollow steel pipe girder according to an embodiment of the present disclosure.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. However, various changes can be made to the embodiments, so the scope of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents, or substitutes for the embodiments are included in the scope of rights.

The terms used in the examples are for descriptive purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the embodiments belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present application. No.

In addition, when describing with reference to the accompanying drawings, identical components will be assigned the same reference numerals regardless of the reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiments, if it is determined that detailed descriptions of related known technologies may unnecessarily obscure the gist of the embodiments, the detailed descriptions are omitted.

Additionally, in describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. When a component is described as being "connected," "coupled," or "connected" to another component, that component may be directly connected or connected to that other component, but there is no need for another component between each component. It should be understood that may be “connected,” “combined,” or “connected.”

Components included in one embodiment and components including common functions will be described using the same names in other embodiments. Unless stated to the contrary, the description given in one embodiment may be applied to other embodiments, and detailed description will be omitted to the extent of overlap.

1 is a perspective view of a hollow steel pipe girder according to an embodiment of the present disclosure. Figure 2 is a cross-sectional view of a hollow steel pipe girder according to an embodiment of the present disclosure.

Referring to Figures 1 and 2, the hollow steel tube girder 10 according to one embodiment may include a steel tube body 100 and a reinforcing material 200 installed in the hollow.

The steel pipe body 100 may have an upper flat portion 110 and a lower curved portion 120. The steel pipe body 100 may have a hollow shape through the flat portion 110 and the curved portion 120. In addition, the curved portion 120 may be made of a curved surface in the shape of an arch or a semi-ellipse as well as a semi-circle, and will be referred to as a hollow (or semi-circular) shape in the present disclosure.

A conventional steel pipe girder or steel pipe body has a circular shape and has curved surfaces on both the upper and lower sides. The circular steel pipe girder joins the deck of the bridge to the upper curved part. Since the deck of the bridge is relatively larger than the width of the circular steel pipe girder, the center of gravity (or neutral axis) of the circular steel pipe girder and the entire bridge deck is the circular steel pipe girder. It is located deviated upward from the central axis of . This bias in the center of gravity leads to an imbalance problem in the stress distribution in which the distribution of stress due to bending moment is biased toward the lower curved part of the circular steel pipe girder. This leads to an increase in diameter or thickness to secure the required rigidity for the circular steel pipe body and There is the same structural problem.

However, the center of gravity (or neutral axis) of the circular steel pipe girder 10 according to an embodiment of the present disclosure is located lower than that of the existing circular steel pipe girder, so the difference between the stress on the upper part and the stress on the lower part is reduced, It prevents the increase in diameter or thickness of steel pipe girders, which can lead to economic improvement through reduction of steel materials.

According to one embodiment, the reinforcing material 200 may include a first leaf spring 210 and a second leaf spring 220. The first leaf spring 210 and the second leaf spring 220 may be installed in a space surrounded by the flat part 110 and the curved part 120. The reinforcing material 200 may function to prevent sagging or twisting of the hollow steel pipe girder 10.

The upper flat portion 110 may include an upper slide groove 111 into which the first leaf spring 210 and the second leaf spring 220 are slidably inserted. Likewise, the lower curved portion 120 may include a lower slide groove 121 into which the first leaf spring 210 and the second leaf spring 220 are inserted in a sliding manner. The first leaf spring 210 and the second leaf spring 220 may be curved toward the center of the steel pipe body.

The first leaf spring 210 and the second leaf spring 220 are elastic plate members in a bent shape, and the upper end is inserted into the upper slide groove 111 and the lower end is inserted into the lower slide groove 121. It can be assembled by fitting between the upper flat part 110 and the lower curved part 120. After fixing the upper slide groove 111 and the lower slide groove 121 to the inner surface of the steel pipe body 100 through welding, etc., the first leaf spring 210 and the second leaf spring 220 are installed in the upper slide groove 111. ) and the lower slide groove 121, the assembly is completed by inserting it in a slide manner, so installation can be simple and easy. In addition, in the hollow steel pipe girder 10 according to an embodiment of the present disclosure, the first leaf spring 210 and the second leaf spring 220 are provided as reinforcement between the flat part 110 and the curved part 120. When inserted as (200), the inside of the steel pipe body 100 is supported in the vertical direction, so that the bending rigidity of the steel pipe body 100 can be improved.

In some embodiments, the first leaf spring 210 and the second leaf spring 220 are inserted in a slide manner between the upper slide groove 111 and the lower slide groove 121, and then the ends are welded or stoppered. By forming it, it is possible to prevent it from being separated from the upper slide groove 111 and the lower slide groove 121.

In one embodiment, a reinforcement portion 130 may be installed on the lower curved portion 120. According to an embodiment of the present disclosure, since the hollow steel pipe body 100 has a semicircular shape, even if the center of gravity is located below the circular steel pipe body, more stress can be applied to the lower part, and the reinforcement portion 130 is formed on the hollow steel pipe body. The strength of the lower part of (100) can be strengthened. The reinforcement portion 130 may have an arc shape following the shape of the lower curved portion 120.

In one embodiment, the lower slide groove 121 may be installed in a way that it is formed in the reinforcement portion 130. In this case, the reinforcement part 130 has a lower slide groove 121, and the reinforcement part 130 is installed on the lower curved part 120, so that the lower slide groove 121 is formed at the lower part of the hollow steel pipe body 100. This can be installed.

In some embodiments, although not shown, a reinforcement part may be further installed on the upper flat part 110. In this case, an upper slide groove 111 may be formed in the reinforcement part installed on the flat part 110.

In one embodiment, the reinforcing material 200, such as the first leaf spring 210 and the second leaf spring 220, is a section where a concentrated load of the hollow steel tube body 100 is generated and is used as a hollow steel tube girder 10. It can be installed at two points at both ends in the longitudinal direction or at three points at both ends and the center. Likewise, the reinforcement portion 130 may be installed at both ends or both ends and the center point in the longitudinal direction of the hollow steel pipe body 100, respectively. In another embodiment, the first leaf spring 210, the second leaf spring 220, and/or the reinforcement portion 130 are installed in at least a portion or most of the area in the longitudinal direction of the hollow steel pipe body 100. It can be.

Figure 3 is a cross-sectional view of a hollow steel pipe girder according to an embodiment of the present disclosure.

Referring to FIG. 3, the steel pipe body 100 of the hollow steel pipe girder 20 according to one embodiment has an upper flat portion 110 and a lower curved portion 120, and the flat portion 110 and The connection portion 140 of the curved portion 120 may form a curved surface. In other words, when the hollow steel pipe girder 10 is viewed from the front, both ends may have a round shape. The hollow steel tube girder (10) with rounded ends on both sides can reduce wind resistance to the hollow steel tube girder (10).

In addition, according to one embodiment, in the hollow steel pipe girder 10 with rounded ends on both sides, the flat portion 110 and the curved portion 120 may be formed integrally with the connecting portion 140, so that the flat portion ( When the curved portion 110) and the curved portion 120 are separated and then joined, there is an effect of preventing damage to the joint portion due to stress acting on the steel pipe body 100.

Figure 4 is a side view of a hollow steel pipe girder according to an embodiment of the present disclosure.

Referring to FIG. 4, the hollow steel pipe girder 30 according to one embodiment may have different heights depending on the longitudinal direction. For example, looking at the A-A' cut surface and B-B' cut surface of the hollow steel pipe girder 30 in Figure 4, the hollow steel pipe girder 30 has a first height (H1) at both ends along the longitudinal direction at the center portion. It may have a length higher than the second height (H2) in . At this time, the flat portion 110 may have the same shape along the longitudinal direction of the hollow steel pipe girder 30, but the curved portion 120 may have a shape that has a different height from the flat portion 110. The hollow steel pipe girder 30 according to this embodiment is formed so that the shape height (or second height (H2)) at the central part is lower than the shape height (or first height (H1)) at both ends, so that the steel pipe body It can save the steel used in (100) and provide aesthetics.

Figure 5 is a cross-sectional view of a bridge on which a hollow steel pipe girder is installed according to an embodiment of the present disclosure.

When the width of the bridge deck 40 is wide, a plurality of steel pipe girders may be installed on the bridge deck 40. Referring to FIG. 5, a first hollow steel pipe girder 51 and a second hollow steel pipe girder 52 according to an embodiment of the present disclosure may be installed on the left and right sides of the top plate 40, respectively. In this way, when the top plate 40 is formed to be wide, twisting due to a lateral load acting on the top plate 40 may act on the steel pipe girders 51 and 52.

In this embodiment, reinforcing leaf springs 310 and 320 may be installed on the first hollow steel tube girder 51 and the second hollow steel tube girder 52, respectively. A first reinforcing leaf spring 310 may be installed in the first hollow steel pipe girder 51 installed on the left side of the upper plate 40, and the first reinforcing leaf spring 310 of the first hollow steel tube girder 51 It can be installed overlapping the first leaf spring 210 installed on the left side. A second reinforcing leaf spring 330 may be installed in the second hollow steel tube girder 52 installed on the right side of the upper plate 40, and the second reinforcing leaf spring 320 of the second hollow steel tube girder 52 It can be installed overlapping the second leaf spring 220 installed on the right side.

The reinforcing leaf springs (310, 320) introduce pre-torsion into the first hollow steel tube girder (51) and the second hollow steel tube girder (52) to support the bridge without additional reinforcement to the transverse members. The lateral rigidity can be improved. In addition, the reinforcing leaf springs 310 and 320 are installed symmetrically on the first hollow steel tube girder 51 and the second hollow steel tube girder 52, so that a symmetrical force is exerted on the width of the upper plate 40 of the bridge. Let it happen.

In one embodiment, the joint between the reinforced leaf springs 310 and 320 and the regular leaf springs 210 and 220 may be performed by bolting and welding.

Figure 6 shows a process for manufacturing a hollow steel pipe girder according to an embodiment of the present disclosure.

Referring to FIG. 6, in the hollow steel pipe girder 60 according to one embodiment, the flat portion 110 and the curved portion 120 may be formed separately and then joined. At this time, the first leaf spring 210 and the second leaf spring 220 may be inserted into the hollow between the joined flat part 110 and the curved part 120 in a sliding manner, but the flat part 110 And it may be installed inside the curved portion 120 in advance before the curved portion 120 is joined to each other.

Referring to (a) of FIG. 6, the first leaf spring 210 and the second leaf spring 220 may be installed with their lower ends inserted into the lower slide groove 121 provided on the curved portion 120. However, the first leaf spring 210 and the second leaf spring 220 have less curvature (or are less curved) than the state (210a, 220a) before the flat part 110 is joined and fitted into the curved part 120. In) the other ends of the first leaf spring 210 and the second leaf spring 220 are inserted into the upper slide groove 111 provided in the flat part 110, and the flat part 110 is joined to the curved part 120. It can be very difficult to get off in the right position.

Accordingly, the upper slide groove 111 provided in the flat plate portion 110 according to an embodiment of the present disclosure includes the first wall portion 410 into which the first leaf spring 210 and the second leaf spring 220 are inserted, and At least one of the second wall portions 420 may be formed to have a curved surface. For example, the second wall portion 420 located adjacent to the center of the flat plate portion 110 in the upper slide groove 111 may have a curved surface on the inside. In the process of assembling the hollow steel pipe girder 60 according to an embodiment of the present disclosure, the worker inserts the first leaf spring 210 and the second leaf spring 220 into the upper slide groove 111 of the flat part 110. ), and then lowered to the position where the flat part 110 and the curved part 120 are joined, the upper ends of the first leaf spring 210 and the second leaf spring 220 are 2 It can be easily and completely inserted into the upper slide groove 111 while moving along the curved surface provided inside the wall portion 420. Referring to (b) of FIG. 6, the tops of the first leaf spring 210 and the second leaf spring 220 are completely inserted into the upper slide groove 111 and the flat portion 110 and the curved portion 120 splicing can be achieved. At this time, as the second wall 420 has a curved surface on the inside, some empty space may be formed even after the leaf springs 210 and 220 are completely inserted. Depending on the embodiment, the space may be filled with a filler such as concrete. By filling, the coupling between the upper slide groove 111 and the leaf springs 210 and 220 can be made more solid.

The hollow steel pipe girder according to various embodiments of the present application includes a hollow steel pipe body having an upper flat portion and a lower curved portion; Includes a first leaf spring and a second leaf spring installed in the hollow of the steel pipe body, respectively on the left and right sides with respect to the center of the steel pipe body, wherein the first leaf spring and the second leaf spring are of the steel pipe body. It can be curved towards the center.

In the hollow steel pipe girder according to various embodiments of the present application, an upper slide groove is provided in the flat portion and a lower slide groove is provided in the curved portion, so that the upper and lower ends of the first and second leaf springs are respectively It may be installed by being inserted into the upper slide groove and the lower slide groove.

In the hollow steel pipe girder according to various embodiments of the present application, the lower slide groove may be provided in an arc-shaped reinforcement portion joined to the inside of the curved portion.

In the hollow steel pipe girder according to various embodiments of the present application, when the steel pipe body is viewed from the front, the ends of both sides are, and the connecting portion of the flat portion and the curved portion forms a curved surface, and the connecting portion is formed with the flat portion and the flat portion. The curved portion may be formed integrally.

In the hollow steel pipe girder according to various embodiments of the present application, the curved portion has a different curvature along the longitudinal direction so that the shape height of both ends along the longitudinal direction is higher than the shape height of the central portion when the steel pipe body is viewed from the side. It can be formed as follows.

In the hollow steel pipe girder according to various embodiments of the present application, the flat plate portion and the curved portion are formed separately and joined, the upper slide groove provided on the flat plate portion includes a first wall portion and a second wall portion, and the flat portion portion Since the second wall portion adjacent to the center has a curved surface on the inside, the lower ends of the first leaf spring and the second leaf spring are pre-fitted into the lower slide groove of the curved portion, and the first leaf spring and the second leaf spring are The upper end of the leaf spring slides along the curved surface inside the second wall portion when the flat portion and the curved portion approach for bonding, and is completely inserted into the upper slide groove after the flat portion and the curved portion are joined. You can.

In a bridge on which a hollow steel pipe girder is installed according to various embodiments of the present disclosure, the hollow steel pipe girder according to claim 1 is installed at the lower left and lower right sides of the upper plate of the bridge, respectively, and the hollow steel pipe on the left Reinforcement leaf springs may be installed overlapping each of the left leaf spring of the girder and the right leaf spring of the right hollow steel pipe girder.

As described above, although the embodiments have been described with limited drawings, those skilled in the art can apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order than the described method, and/or components of the described system, structure, device, circuit, etc. are combined or combined in a different form than the described method, or other components are used. Alternatively, appropriate results may be achieved even if substituted or substituted by an equivalent.

Therefore, other implementations, other embodiments, and equivalents of the claims also fall within the scope of the following claims.

Claims (7)

In the hollow steel pipe girder,
A hollow steel pipe body with an upper flat portion and a lower curved portion;
Includes a first leaf spring and a second leaf spring installed in the hollow of the steel pipe body, respectively on the left and right sides with respect to the center of the steel pipe body,
The first leaf spring and the second leaf spring are curved toward the center of the steel pipe body,
An upper slide groove is provided on the flat portion, and a lower slide groove is provided on the curved portion,
The upper and lower ends of the first and second leaf springs are installed to be inserted into the upper slide groove and the lower slide groove, respectively,
The flat portion and the curved portion are formed separately and joined,
The upper slide groove provided in the flat portion includes a first wall portion and a second wall portion, and the second wall portion adjacent to the center of the flat portion has a curved surface on the inside,
The lower ends of the first leaf spring and the second leaf spring are pre-fitted into the lower slide groove of the curved part, and the upper ends of the first leaf spring and the second leaf spring are joined to the flat part and the curved part. When approaching, it slides along the curved surface inside the second wall portion, and is completely inserted into the upper slide groove after the flat portion and the curved portion are joined,
Hollow steel pipe girder.
delete According to paragraph 1,
The lower slide groove is provided in an arc-shaped reinforcement part joined to the inside of the curved part,
Hollow steel pipe girder. According to paragraph 1,
When the steel pipe body is viewed from the front, the ends of both sides are formed, and the connecting portion of the flat portion and the curved portion forms a curved surface,
The connection portion is formed by integrally forming the flat portion and the curved portion,
Hollow steel pipe girder. According to paragraph 1,
The curved portion is formed to have different curvatures along the longitudinal direction so that the profile height of both ends along the longitudinal direction is higher than the profile height of the central portion when the steel pipe body is viewed from the side,
Hollow steel pipe girder. delete In a bridge where a hollow steel pipe girder is installed,
The hollow steel pipe girders according to claim 1 are installed below the left and right sides of the upper plate of the bridge, respectively,
Reinforcement leaf springs are installed overlapping each of the left leaf spring of the hollow steel tube girder on the left and the right leaf spring of the hollow steel tube girder on the right.
A bridge where hollow steel pipe girders are installed.