Girder system having bending moment reducing apparatus

Abstract

A girder system including a bending moment reduction device according to one aspect of the present invention includes a tension member device coupled to a tension section—lower part of a positive moment section or upper part of a negative moment section—along the longitudinal direction of the girder, or a compression member device coupled to a compression section—upper part of a positive moment section or lower part of a negative moment section—along the longitudinal direction of the girder.

Description

Technology Field

[0001] The present invention relates to a girder system including a bending moment reduction device. Background Technology

[0002] A girder is a superstructure for bridges, and for example, both ends of the girder can be supported by a pair of abutments.

[0003] Bending moments occur in these girders, and in order to reduce the bending moment, prestressing cables, which are tensioning members, are sometimes reinforced by debonding along the entire length of the girder.

[0004] However, since this method involves debonding the prestressed cables, which are tensioning members, along the entire length of the steel girder, the tensioning force of the cables can cause bending buckling in the girder, making it difficult to introduce large tensioning forces into the girder, and there may be weaknesses in cable maintenance.

[0005] Accordingly, the inventor of the present invention has completed the present invention after conducting research and going through trial and error for a long time to reduce the bending moment of the girder. The problem to be solved

[0006] One of the objectives of the present invention is to provide a girder system including a bending moment reduction device capable of efficiently reducing the bending moment of a girder.

[0007] Meanwhile, other unspecified objects of the present invention will be further considered to the extent that they can be easily inferred from the following detailed description and effects. means of solving the problem

[0008] According to one embodiment of the present invention, a girder system comprising a bending moment reduction device may be provided, characterized by including: a tension member device coupled to a tension section—lower part of a positive moment section or upper part of a negative moment section—along the longitudinal direction of the girder; or a compression member device coupled to a compression section—upper part of a positive moment section or lower part of a negative moment section—along the longitudinal direction of the girder.

[0009] According to another embodiment of the present invention, a girder system comprising a bending moment reduction device may be provided, characterized by including: a tension member device coupled to a tension section—lower part of a positive moment section or upper part of a negative moment section—along the longitudinal direction of the girder; and a compression member device coupled to a compression section—upper part of a positive moment section or lower part of a negative moment section—along the longitudinal direction of the girder.

[0010] Here, the tension device may include: a prestressing tension member; a pair of first anchoring devices that anchor both ends of the prestressing tension member; a first cement paste disposed between the first anchoring devices and integrated with the prestressing tension member; and a first formwork that surrounds and supports the first cement paste.

[0011] Additionally, the compression device may include a prestressing compression member; a pair of second anchoring devices that anchor both ends of the prestressing compression member; a second cement paste disposed between the second anchoring devices and integrated with the prestressing compression spring; and a second formwork that surrounds and supports the second cement paste.

[0012] In addition, the above girder is an H-shaped girder, and the tension device can be connected to the tension section—the lower flange of the positive moment section or the upper flange of the negative moment section.

[0013] In addition, the girder is an H-shaped girder, and the compression device can be connected to the compression section—the upper flange of the positive moment section or the lower flange of the negative moment section.

[0014] Additionally, the tension device may include a prestressing tension member—in which an initial tension force is introduced at the end of the prestressing tension member—; a pair of third anchoring devices that anchor both ends of the prestressing tension member; a pair of wedges coupled to the third anchoring devices; and a curvature maintaining device coupled to the prestressing tension member to maintain the curvature of the prestressing tension member.

[0015] Additionally, the tension device may include: a pair of prestressing tension members; a fourth anchoring device coupled to one end of each of the pair of prestressing tension members; a cable eye type connecting bolt coupled to the other end of each of the pair of prestressing tension members; and a turnbuckle connecting the cable eye type connecting bolts to each other—tension force is introduced to the prestressing tension members by the rotation of the turnbuckle.

[0016] Additionally, the compression device may include: a prestressing compression member; a forward screw coupled to both ends of the prestressing compression member; a fifth anchoring device combined with a nut that is coupled to the forward screw and anchors both ends of the prestressing compression member—compressive force is introduced to the prestressing compression member by the advancement of the forward screw—; and a curvature maintaining device coupled to the prestressing compression member and maintaining the curvature of the prestressing compression cable.

[0017] Additionally, the compression device may include: a pair of prestressing compression members; a sixth anchoring device coupled to one end of each of the pair of prestressing compression members; a spring connecting bolt coupled to the other end of each of the pair of prestressing compression members; and a reverse turnbuckle connecting the spring connecting bolts to each other—in which a compressive force is introduced to the prestressing compression members by the rotation of the reverse turnbuckle.

[0018] In addition, each of the compression device and the tension device may be disposed on the inner side along the longitudinal direction of the girder so as not to be exposed to each of the two ends along the longitudinal direction of the girder. Effects of the invention

[0020] According to one embodiment of the present invention, the bending moment of a girder system can be efficiently reduced.

[0021] Meanwhile, it should be added that even if an effect is not explicitly mentioned here, the effects described in the following specification and the provisional effects expected by the technical features of the present invention are treated as described in the specification of the present invention. Brief explanation of the drawing

[0022] FIG. 1 is a schematic drawing showing a girder system including a bending moment reduction device according to one embodiment of the present invention. FIG. 2 is a drawing showing a cross-section along line AA' of FIG. 1. FIG. 3 is a schematic diagram showing a tension device. FIG. 4 is a diagram schematically illustrating a method of introducing initial tension force to the end of a tension device. FIG. 5 is a diagram schematically illustrating a method of introducing initial tension force to the central part of a tension device. FIG. 6 is a schematic drawing showing a girder system including a bending moment reduction device according to another embodiment of the present invention. FIG. 7 is a drawing showing a cross-section along the line BB' of FIG. 6. FIG. 8 is a schematic diagram showing a compression device. FIG. 9 is a diagram schematically illustrating a method of introducing an initial compressive force to the end of a compression device. FIG. 10 is a diagram schematically illustrating a method of introducing an initial compressive force to the central part of a compression device. FIGS. 11a, FIGS. 11b, FIGS. 12a, FIGS. 12b, FIGS. 13a, FIGS. 13b, and FIGS. 14 are each schematic drawings illustrating a girder system including a bending moment reduction device according to variations of the present invention. It should be noted that the attached drawings are provided as examples for reference to help understand the technical concept of the present invention, and the scope of the rights of the present invention is not limited by them. Specific details for implementing the invention

[0023] In describing the present invention, detailed descriptions of related known functions are omitted if they are deemed obvious to a person skilled in the art and could unnecessarily obscure the essence of the invention.

[0024] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0025] Hereinafter, an embodiment of a girder system including a bending moment reduction device according to the present invention will be described in detail with reference to the attached drawings. In describing with reference to the attached drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted.

[0027] FIG. 1 is a schematic diagram showing a girder system including a bending moment reduction device according to an embodiment of the present invention. FIG. 2 is a diagram showing a cross-section along the line AA' of FIG. 1. FIG. 3 is a schematic diagram showing a tension member device. FIG. 4 is a schematic diagram showing a method of introducing an initial tension force to the end of a tension member device. FIG. 5 is a schematic diagram showing a method of introducing an initial tension force to the center of a tension member device.

[0028] Meanwhile, for convenience of explanation, in this specification, the “girder system including a bending moment reduction device” according to the present invention will be referred to as the “girder system.”

[0029] Referring to FIGS. 1 to 3, a girder system (1000) according to one embodiment of the present invention includes a tension device (100) and a girder (300).

[0030] A girder (300) may be a superstructure such as a bridge. For example, the girder (300) may be made of steel, such as an H-beam, as shown in FIG. 1.

[0031] The girder (300) may include a web (310), an upper flange (320) extending in the longitudinal direction (L) with a predetermined width from the upper part of the web (310), and a lower flange (330) extending in the longitudinal direction (L) with a predetermined width from the lower part of the web (310). The web (310) connects the upper and lower flanges (320, 330) to each other, and the width of the web (310) may be smaller than the width of the upper and lower flanges (320, 330).

[0032] The girder (300) may be supported by at least one support member positioned below the lower flange (330). For example, the girder (300) may be supported at both ends by a pair of support members, but the scope of the invention is not limited thereto.

[0033] The tension device (100) is configured to introduce tension force (prestressed tension force) into the girder system (1000) according to the present embodiment, and can strengthen the bending strength of the tension portion of the girder (300).

[0034] Referring to FIG. 3, the tension device (100) includes a prestressing tension member (110), a first anchoring device (120), a first cement paste (130), and a first formwork (140).

[0035] The first formwork (140) can form an internal space in which the prestressing tension member (110) and the first cement paste (130), which will be described later, are received. In this respect, the first formwork (140) may be a frame that forms the overall shape of the tension member device (100).

[0036] The first formwork (140) may be in a form that defines the aforementioned internal space solely by the first formwork (140), but the scope of the present invention is not limited thereto. As another example that is not limited thereto, in a case where the aforementioned internal space is formed in a roughly rectangular shape based on a width-thickness cross-section (WT cross-section), the first horizontal side and the first vertical side of the rectangle are defined by the first formwork (140), and the second horizontal side and the second vertical side of the rectangle are defined by the girder (300), the first formwork (140) may be in a form that defines the aforementioned internal space together with at least a part of the girder (300).

[0037] The first formwork (140) may be in the form of multiple steel plates physically joined together, but is not limited thereto, and may be in the form of multiple steel plates welded together to form an integrated structure.

[0038] The prestressing tension member (110) can be placed inside the first formwork (140) to provide tension to the tension member device (100) and the girder (300).

[0039] The prestressing tension member (110) can be formed through processing using tensile force. For example, the prestressing tension member (110) may be in the form of a bundle of steel wires twisted together. As another example, the prestressing tension member (110) may be a steel rod or a composite member.

[0040] The prestressing tension members (110) may be arranged in a single unit extending in the longitudinal direction (L) within the aforementioned internal space, or in a plurality of units each extending in the longitudinal direction (L) and spaced apart from each other in the width direction (W) and / or thickness direction (T).

[0041] The first anchoring device (120) can be positioned at both ends in the longitudinal direction (L) of the first formwork (140) to fix both ends in the longitudinal direction (L) of the prestressing tension member (110). To this end, the first anchoring device (120) may include a support member having a hole formed therein and positioned at each end in the longitudinal direction (L) of the first formwork (140), and a fixing member that is connected to each end in the longitudinal direction (L) of the prestressing tension member (110) through the hole.

[0042] The first cement paste (130) may be placed between a pair of first anchoring devices (120) and integrated with the prestressing tension member (110). The first cement paste (130) may be in a form that fills the internal space of the aforementioned first formwork (140) and may be wrapped by the first formwork (140).

[0043] The tension device (100) may have an initial tension force introduced at both ends in the longitudinal direction (L) or an initial tension force introduced at the center in the longitudinal direction (L).

[0044] Referring to FIG. 4, an initial tension force can be introduced to both ends in the longitudinal direction (L) of the prestressing tension member (110) of the tension member device (100) using a curvature maintaining device (150) and a wedge (160). The wedge (160) is fixed to each of a pair of first anchoring devices (120), and thus, the pair of wedges (160) can transmit the tension force of an external mechanical device to both ends in the longitudinal direction (L) of the prestressing tension member (110). The curvature maintaining device (150) is positioned so that the curvatures of the prestressing tension member (110) and the girder (300) are similar to each other, and, as an example not limited to, can be joined to the girder (300) through welding, etc.

[0045] Referring to FIG. 5, an initial tension force can be introduced in the longitudinal (L) central portion of the prestressing tension member (110) of the tension member device (100) using a curvature maintaining device (150) and a spacing member (170). The prestressing tension member (110; 110-1, 110-2) may be provided as a pair separated from each other along the longitudinal (L). At this time, one end of each of the pair of prestressing tension members (110-1, 110-2) may be fixed to each of the pair of first anchoring devices (120). At this time, the tension member may be a cable. The other ends of each of the pair of prestressing tension members (110-1, 110-2) facing each other may be connected by a spacing member (170). The spacing member (170) includes cable eye-type connecting bolts (171, 172) connected to the other end of each of the prestressing tension members (110-1, 110-2), and a turnbuckle (173) connecting the cable eye-type connecting bolts to each other. As the distance between the connecting bolts (171, 172) is reduced by rotating the turnbuckle (173), an initial tension force can be introduced to the center of the tension member device (100) in the longitudinal direction (L).

[0046] Meanwhile, FIGS. 4 and 5 illustrate only a single (or a pair) prestressing tension member (110) arranged along the longitudinal direction (L) and a single curvature maintaining device (150) arranged, but this is for convenience of explanation and to aid understanding, so the scope of the present invention is not limited to the number of each prestressing tension member (110) and curvature maintaining device (150) illustrated in the drawings.

[0047] The tension device (100) and the girder (300) can be joined to each other by welding at least a portion of each. For example, the girder (300) can be joined by welding to at least one of a pair of first anchoring devices (120) and curvature maintaining devices (150). As another example, the tension device (100) and the girder (300) can be joined to each other by integrating at least a portion of each in direct contact with cement paste (130).

[0048] The tension device (100) may be placed in a tension portion along the longitudinal direction (L) of the girder (300). For example, the tension device (100) may be placed only in a length of the girder (300) where the bending strength is insufficient. At this time, the tension device (100) may be placed in a single girder (300) in a single or multiple manner based on one of the two sides facing in the width direction (W) of the web (310).

[0049] For example, as illustrated in FIG. 1, in the case where both ends of the girder (300) in the longitudinal direction (L) are supported, the tension device (100) may be positioned at the bottom of the positive moment section of the girder (300). That is, the tension device (100) may be coupled to the lower flange (330) in the center of the girder (300) in the longitudinal direction (L). Additionally, the length (Lrd) of the tension device (100) may be shorter than the length (Lg) of the girder.

[0051] FIG. 6 is a schematic diagram showing a girder system including a bending moment reduction device according to another embodiment of the present invention. FIG. 7 is a diagram showing a cross-section along the line BB' of FIG. 6. FIG. 8 is a schematic diagram showing a compression device. FIG. 9 is a schematic diagram showing a method of introducing an initial compressive force to the end of a compression device. FIG. 10 is a schematic diagram showing a method of introducing an initial compressive force to the center of a compression device.

[0052] Referring to FIGS. 6 to 8, a girder system (1000') according to another embodiment of the present invention includes a compression device (200) and a girder (300).

[0053] Meanwhile, when comparing FIGS. 1 to 3 and FIGS. 6 to 8, the girder system (1000') according to this embodiment differs from the girder system (1000) according to one embodiment of the present invention in that the compression device (200) is different. Therefore, in describing this embodiment, only the compression device (200) that is different from that in one embodiment of the present invention will be described. Other configurations applied to this embodiment may be described as they are in one embodiment of the present invention.

[0054] The compression device (200) is configured to introduce prestressed compressive force into the girder system (1000') according to the present embodiment, and can strengthen the bending strength of the compression portion of the girder (300).

[0055] Referring to FIG. 8, the compression device (200) includes a prestressing compression material (210), a second anchoring device (220), a second cement paste (230), and a second formwork (240).

[0056] The second formwork (240) can form an internal space in which the prestressing compression material (210) and the second cement paste (230), which will be described later, are received. In this respect, the second formwork (240) may be a frame that forms the overall shape of the compression material device (200).

[0057] The second formwork (240) may be in a form that defines the aforementioned internal space solely by the second formwork (240), but the scope of the present invention is not limited thereto. As another example that is not limited thereto, in a case where the aforementioned internal space is formed in a roughly rectangular shape based on a width-thickness cross-section (WT cross-section), the first horizontal side and the first vertical side of the rectangle are defined by the second formwork (240), and the second horizontal side and the second vertical side of the rectangle are defined by the girder (300), the second formwork (240) may be in a form that defines the aforementioned internal space together with at least a part of the girder (300).

[0058] The second formwork (240) may be in the form of multiple steel plates physically joined together, but is not limited thereto, and may be in the form of multiple steel plates welded together to form an integrated structure.

[0059] The prestressing compression member (210) can be placed inside the second formwork (240) to provide tension force to the compression member device (200) and the girder (300).

[0060] The prestressing compression member (210) can be formed through processing using compressive force. For example, the prestressing compression member (210) may be in the form of a compressed spring.

[0061] The prestressing compression members (210) may be arranged in a single unit extending in the length direction (L) within the aforementioned internal space, or in a plurality of units each extending in the length direction (L) and spaced apart from each other in the width direction (W) and / or thickness direction (T).

[0062] The second anchoring device (220) may be positioned at both ends in the longitudinal direction (L) of the second formwork (240) to fix both ends in the longitudinal direction (L) of the prestressing compression member (210). To this end, the second anchoring device (220) may include a support member having a hole formed therein and positioned at each end in the longitudinal direction (L) of the second anchoring device (220), and a fixing member that is connected to each end in the longitudinal direction (L) of the prestressing compression member (210) through the hole.

[0063] The second cement paste (230) may be placed between a pair of second anchoring devices (220) and integrated with the prestressing compression material (210). The second cement paste (230) may be in the form of filling the aforementioned internal space and may be wrapped by the second formwork (240).

[0064] The compression device (200) may have an initial compressive force introduced at both ends in the longitudinal direction (L) or an initial compressive force introduced at the center in the longitudinal direction (L).

[0065] Referring to FIG. 9, an initial compressive force can be introduced to both ends in the longitudinal direction (L) of the prestressing compression member (210) of the compression member device (200) using a curvature maintaining device (250) and a forward screw (260). The forward screw (260) is coupled to each of a pair of second anchoring devices (220) that also serve as nuts. The pair of screws (260) can transmit an externally applied compressive force to both ends in the longitudinal direction (L) of the prestressing compression member (210) by rotation. The curvature maintaining device (250) is positioned so that the curvature of the prestressing compression member (210) and the girder (300) are similar, and, as an example not limited to, can be joined to the girder (300) through welding, etc.

[0066] Referring to FIG. 10, an initial compressive force can be introduced in the longitudinal (L) central portion of the prestressing compression member (210) of the compression member device (200) using a curvature maintaining device (250) and a spacing maintaining member (270). The prestressing compression member (210; 210-1, 210-2) may be provided as a pair separated from each other along the longitudinal (L). At this time, one end of each of the prestressing compression members (210-1, 210-2) may be fixed to each of the pair of second anchoring devices (220). The other ends of each of the pair of prestressing compression members (210-1, 210-2) facing each other may be connected by a spacing maintaining member (270). The spacing member (270) includes spring connecting bolts (271, 272) connected to the other ends of each of the prestressing compression members (210-1, 210-2), and a reverse turnbuckle (273) connecting the spring connecting bolts (271, 272) to each other. As the reverse turnbuckle (273) is rotated, the distance between the connecting bolts (271, 272) increases, thereby introducing an initial compressive force to the center of the compression member device (200) in the longitudinal direction (L).

[0067] Meanwhile, FIGS. 9 and 10 illustrate only a single (or a pair) of prestressing compression members (210) arranged along the longitudinal direction (L) and a single curvature maintaining device (250) arranged; however, since this is for convenience of explanation and to aid understanding, the scope of the present invention is not limited to the details shown in the drawings, and thus the scope of the present invention is not limited to the number of each of the prestressing compression members (210) and curvature maintaining devices (250) shown in the drawings.

[0068] The compression device (200) and the girder (300) can be joined to each other by welding at least a portion of each. For example, the girder (300) can be joined by welding to at least one of a pair of second anchoring devices (220) and curvature maintaining devices (250). As another example, the compression device (200) and the girder (300) can be joined to each other by being integrated by directly contacting at least a portion of each with cement paste (230).

[0069] The compression device (200) may be placed in a compression section along the longitudinal direction (L) of the girder (300). Additionally, the compression device (200) may be placed only in a length of the girder (300) where the bending strength is insufficient. At this time, the compression device (200) may be placed in a single girder (300) in a single or multiple manner based on one of the two sides facing in the width direction (W) of the web (310).

[0070] For example, as illustrated in FIG. 6, in the case where both ends of the girder (300) are supported, the compression device (200) may be positioned above the positive moment section of the girder (300). That is, the compression device (200) may be coupled to the upper flange (320) in the longitudinal (L) central part of the girder (300). Additionally, the length of the compression device (200) may be shorter than the length of the girder (300).

[0072] FIGS. 11a, FIGS. 11b, FIGS. 12a, FIGS. 12b, FIGS. 13a, FIGS. 13b, and FIGS. 14 are each schematic drawings illustrating a girder system including a bending moment reduction device according to variations of the present invention. Meanwhile, in the description of the variations below, only configurations that differ from the girder systems (1000, 1000') according to the aforementioned first and other embodiments of the present invention will be described.

[0073] According to variations of the present invention, a plurality of tension device (100) may be arranged spaced apart from each other, or a plurality of compression device (200) may be arranged spaced apart from each other. Meanwhile, in the following description of the tension device (100) or the compression device (200), only one of the two sides facing in the width direction (W) of the web (310) is described.

[0074] For example, as illustrated in FIG. 13a, when both ends of the girder (300) in the longitudinal direction (L) and the center of the girder (300) in the longitudinal direction (L) are supported, the tension member devices (100A, 100B, 100C) may be formed in multiple numbers and spaced apart from each other in the longitudinal direction (L). Here, the tension member devices (100A, 100C) may each be placed at the bottom of the positive moment section of the girder (300) (where the support points of the girder (300) are referred to as the first to third support points along the left to right side of FIG. 13a, this refers to the section between the first support point and the second support point, and the section between the second support point and the third support point. The same meaning is used in the descriptions regarding FIG. 11a, FIG. 11b, FIG. 12a, FIG. 12b, FIG. 13b, and FIG. 14). That is, the tension device (100A, 100C) can be coupled with the lower flange (330) of the aforementioned area. Also, the tension device (100B) can be placed on the upper part of the negative moment section of the girder (300) (meaning the area near the second support point when the support points of the girder (300) are referred to as the first to third support points along the left to right of FIG. 13a, respectively. The same meaning is used in the descriptions regarding FIG. 11a, FIG. 11b, FIG. 12a, FIG. 12b, FIG. 13b, and FIG. 14). That is, the tension device (100B) can be coupled with the upper flange (320) of the aforementioned area. In addition, the length of each tension device (100A, 100B, 100C) may be shorter than the length of the girder. As another example, as illustrated in FIG. 13b, in the case where both ends of the girder (300) and the longitudinal (L) central portion of the girder (300) are supported, the compression device (200A, 200B, 200C) may be formed in multiple numbers and spaced apart from each other in the longitudinal (L) direction. Here, the compression device (200A, 200C) may each be positioned above the positive moment section of the girder (300).That is, the compression device (200A, 200C) can be coupled to the upper flange (320) of the aforementioned region. Also, the compression device (200B) can be positioned below the negative moment section of the girder (300). That is, the compression device (200B) can be coupled to the lower flange (330) of the aforementioned region. In addition, the length of each compression device (200A, 200B, 200C) may be shorter than the length of the girder.

[0076] According to other variations of the present invention, the girder system may include a tension device (100) and a compression device (200). Here, the tension device (100) and the compression device (200) may each be arranged in a single or multiple numbers based on one of the two sides facing in the width direction (W) of the web (310). Meanwhile, in the following description of the tension device (100) and the compression device (200), the description is based only on one of the two sides facing in the width direction (W) of the web (310).

[0077] In some variations, the tension device (100) and the compression device (200) may be placed only in the negative moment section of the girder (300) or only in the positive moment section of the girder (300).

[0078] For example, as illustrated in FIG. 11a, each of the tension device (100) and the compression device (200) is formed as a single unit, the tension device (100) is positioned in the tension portion (upper part of the negative moment section) along the longitudinal direction (L) of the girder (300), and the compression device (200) can be positioned in the compression portion (lower part of the negative moment section) along the longitudinal direction (L) of the girder (300). As another example, as illustrated in FIG. 11b, the tension devices (100A, 100B) are formed as a plurality spaced apart in the longitudinal direction (L), and the compression devices (200A, 200B) are formed as a plurality spaced apart in the longitudinal direction (L). Here, the tension device (100A, 100B) is placed in the tension section (lower part of the positive moment section) along the longitudinal direction (L) of the girder (300), and the compression device (200A, 200B) can be placed in the compression section (upper part of the positive moment section) along the longitudinal direction (L) of the girder (300).

[0079] In some variations, the tension device (100) and the compression device (200) may be connected only to the lower flange (330) of the girder (300) or only to the upper flange (320) of the girder (300).

[0080] For example, as shown in FIG. 12a, the tension device (100A, 100B) may be formed in multiple numbers and spaced apart in the longitudinal direction (L) and positioned in the lower part of the positive moment section, and the compression device (200) may be formed in a single number and positioned in the lower part of the negative moment section. As another example, as shown in FIG. 12b, the compression device (200A, 200B) may be formed in multiple numbers and spaced apart in the longitudinal direction (L) and positioned in the upper part of the positive moment section, and the tension device (100) may be formed in a single number and positioned in the upper part of the negative moment section.

[0081] In some variations, the tension device (100) and the compression device (200) may be placed in both the positive moment section and the negative moment section of the girder (300).

[0082] For example, as shown in FIG. 14, the tension member devices (100A, 100B, 100C) may be formed in multiple numbers and spaced apart from each other in the longitudinal direction (L), and may be respectively placed at the lower part of the positive moment section and the upper part of the negative moment section, which are the tension parts of the girder (300). Additionally, the compression member devices (200A, 200B, 200C) may be formed in multiple numbers and spaced apart from each other in the longitudinal direction (L), and may be respectively placed at the upper part of the positive moment section and the lower part of the negative moment section, which are the compression parts of the girder (300).

[0083] The scope of protection of the present invention is not limited to the description and expression of the embodiments explicitly described above. Furthermore, it is added once again that the scope of protection of the present invention cannot be limited by obvious changes or substitutions in the technical field to which the present invention belongs. Explanation of the symbols

[0084] 100: Tension device 110: Prestressing tensile member 200: Compression device 210: Prestressing Compression 120, 220: Fixing device 130, 230: Cement paste 140, 240: Formwork 150, 250: Curvature retainer 160: Wedge 260: Forward Screw 170, 270: Spacing member 300: Girder 400: Separation 1000, 1000': Girder system

Claims

Claim 1 delete Claim 2 A tension device coupled to a tension section along the longitudinal direction of the girder; and a compression device coupled to a compression section along the longitudinal direction of the girder, wherein the tension section is the lower part of a positive moment section and the upper part of a negative moment section, and the compression section is the upper part of a positive moment section and the lower part of a negative moment section, and the tension device comprises: a pair of prestressing tension members in the form of steel wires bundled together and twisted; a pair of first anchoring devices for anchoring one end of each of the pair of prestressing tension members; a cable eye-type connecting bolt coupled to the other end of each of the pair of prestressing tension members; a turnbuckle connecting the cable eye-type connecting bolts to each other; and a first cement paste disposed between the first anchoring devices and integrated with the prestressing tension members. and includes a first formwork that wraps around and supports the entire perimeter of the first cement paste, wherein the turnbuckle is positioned at the longitudinal center of the tension device so that the gap between the pair of prestressing tension members is narrowed by the rotation of the turnbuckle and tension is introduced into the prestressing tension members, and the compression device comprises: a pair of prestressing compression members in the form of compressed springs; a pair of second anchoring devices that anchor one end of each of the pair of prestressing compression members; a spring connecting bolt coupled to the other end of each of the pair of prestressing compression members; a reverse turnbuckle connecting the spring connecting bolts to each other; and a second cement paste disposed between the second anchoring devices and integrated with the prestressing compression members.A girder system comprising a bending moment reduction device, wherein the girder system includes a second formwork that surrounds and supports the entire perimeter of the second cement paste, and the reverse turnbuckle is positioned at the longitudinal center of the compression device so that the gap between the pair of prestressing compression members widens and a compressive force is introduced to the prestressing compression members by the rotation of the reverse turnbuckle, and each of the compression device and the tension device is positioned on the inner side along the longitudinal direction of the girder so as not to be exposed to each of the two ends along the longitudinal direction of the girder. Claim 3 delete Claim 4 delete Claim 5 A girder system comprising a bending moment reduction device, wherein, in paragraph 2, the girder is an H-shaped girder, the tension member device is connected to a tension portion, and the tension portion is the lower flange of a positive moment section or the upper flange of a negative moment section. Claim 6 A girder system comprising a bending moment reduction device, wherein, in paragraph 2, the girder is an H-shaped girder, the compression device is connected to a compression section, and the compression section is the upper flange of a positive moment section or the lower flange of a negative moment section. Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 delete

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