JP6684099B2 - Existing steel girder bridge connection method - Google Patents

Description

The present invention relates to a steel girder bridge in which a plurality of upper structures provided with steel main girders in the bridge axis direction, which are arranged at predetermined intervals in the direction orthogonal to the bridge axis, are arranged in the bridge axis direction. on the consolidated method in already設鋼digit bridges you-less.

  Conventionally, in a steel girder bridge in which a plurality of superstructures having steel main girders in the bridge axis direction arranged at a predetermined interval in the bridge axis direction are arranged in the bridge axis direction in the bridge axis direction. The end portions of the steel main girders of the upper structure adjacent to each other have been provided with the expansion and contraction device as shown in Patent Document 1 up to now, but as shown in Patent Document 2 in order to improve the traveling property. A main girder connecting method for connecting the web members of the steel main girders of the upper structure adjacent to each other in the bridge axis direction has been proposed as a jointless method.

  However, in the main girder connection construction method as described above, the steel main girders in the upper structures adjacent to each other in the bridge axis direction, such as different sectional shapes of steel main girders and different positions in the direction perpendicular to the bridge axis. In the case where the structures are different, it is difficult to connect the web members in the steel main girders, and there are many structures in which the main girder connection method cannot be applied.

JP, 10-159023, A Japanese Patent Laid-Open No. 09-013319

Accordingly, the present invention is a superstructure of steel girder bridges, and aims to provide a connecting method in the already設鋼digits bridges configuration by connecting the different steel main beam together integrally, Ru can joint-less To do.

This invention, there a superstructure having a steel main beam of the bridge axis perpendicular disposed at a predetermined distance bridge axis direction by the connecting method of an existing steel girder bridges in which a plurality disposed in the bridge axis A steel main girder cutting step of cutting the steel main girders on opposite sides of the upper structures adjacent to each other in the bridge axis direction, and steel between the upper structures adjacent to each other in the bridge axis direction. In the space cut in the manufacturing main girder cutting step, a steel cross girder arrangement step of arranging the steel cross girder in the direction perpendicular to the bridge axis, and a main girder connecting the steel main girder to the steel cross girder The connecting step and the connecting step are performed in this order.

  The steel main girder described above may be I-type steel, H-type steel having steel flanges at the upper and lower ends of the web, or a steel box girder, for example, and these steels are used in the upper structure adjacent in the bridge axial direction. Different types of main girders may be used, or steel main girders of the same type may be used

According to the present invention, the steel main girders in the upper structures adjacent to each other in the bridge axis direction are mechanically connected to each other through the steel cross girders in the direction perpendicular to the bridge axis to be integrated, and the structure of the steel main girder is obtained. Different upper structures can be jointless.
The configuration of the steel main girder refers to the cross-sectional shape of the steel main girder, the axial direction of the steel main girder, the position of the steel main girder, and the like.

  To be more specific, steel main girders, which were different in type or could not be physically connected under various conditions even if they were the same type, were placed between the upper structures adjacent to each other in the bridge axis direction. By connecting to the steel cross girders in the direction orthogonal to the bridge axis, the steel main girders in the upper structures adjacent to each other in the bridge axis direction through the steel cross girders in the direction perpendicular to the bridge axis are mechanically coupled to each other. The upper structures having different main steel girder structures can be jointless.

  The above-mentioned steel main girders are mechanically connected to each other to be integrated, which means a state in which the cross-sectional force acting on the upper structure can be reliably transmitted, and a plurality of them are arranged at predetermined intervals in the direction perpendicular to the bridge axis. Each of the arranged steel main girders is not only connected to and integrated with the steel main girders of the upper structures adjacent to each other in the bridge axial direction, but also the steel main girders provided and connected to the upper structure. It shall include the main girder as a whole and be integrated.

  Note that the steel main girder is connected to the steel transverse girder in the direction perpendicular to the bridge axis as described above, not only is the end portion of the steel main girder directly connected to the steel transverse girder. The steel main girder may be connected to the steel cross girder via another member such as a splice plate.

As an aspect of the present invention, the steel cross beam may be configured by an I-shaped steel cross beam having an I-shaped cross section or a box-shaped steel cross beam having a box-shaped cross section.
According to the present invention, the steel main girders in the upper structure adjacent to each other in the bridge axial direction can be mechanically connected and integrated via the steel cross girder having a desired strength to form a jointless structure.

  Further, as an aspect of the present invention, the steel main girders of the upper structures adjacent to each other in the bridge axis direction are both I-type steel main girders having an I-shaped cross section, and a plurality of them are arranged in a direction perpendicular to the bridge axis. At least one of the sectional shape, the axial direction, and the position of at least one of the I-type steel main girders may be different in the upper structures adjacent to each other in the bridge axial direction.

The above-mentioned "I-type steel main girders having different cross-sectional shapes" means that the I-type steel main girders have different cross-sectional sizes such as flange width, girder height, and plate thickness.
The difference in the axial direction of the above I-type steel main girder means that the axial direction of any one of the I-type steel main girders is different in at least one of the horizontal direction, the vertical direction, and the oblique direction, so that the respective axial directions are in a plan view. It means that the axial directions do not match, such as forming a C-shape or an inverted C-shape in cross section. More specifically, it means that the crossing angle of each I-type steel main girder in the axial direction is equal to or greater than a predetermined angle. .

  That the positions of the I-type steel main girders described above are different means that the positions of the facing I-type steel main girders are different in at least one of the horizontal direction, the vertical direction, and the oblique direction. The case where the positions are different includes the case where the positions are different due to the difference in the number of I-type steel main girders provided in the upper structure and the case where there is no facing I-type steel main girder.

  According to the present invention, even if the steel main girders provided in the upper structures adjacent to each other in the bridge axis direction are I-type steel main girders, that is, the same type of steel main girders, the cross-sectional shape of the I-type steel main girder is obtained. Even if the connection cannot be made because at least one of the axial direction and the position is different, the I-type steel main girders are mechanically connected and integrated through the steel cross girders in the direction orthogonal to the bridge axis, and the joint is formed. It can be made less.

  If the steel main girders to be mechanically integrated in the upper structures adjacent to each other in the bridge axis direction are the I-type steel main girders, the steel main girders provided in the upper structure are the I-type steels. It may be configured by only the main girders, or the box-type steel main girders may be provided in addition to the I-type steel main girders.

  Further, as an aspect of the present invention, one of the steel main girders in the upper structure adjacent to each other in the bridge axis direction is configured by a box-shaped steel main girder having a box-shaped cross section, and the other steel main girder has a cross section. It may be composed of an I-type steel main girder of type I or the box-type steel main girder.

  According to the present invention, when at least one of the steel main girders which are provided in the upper structures adjacent to each other in the bridge axis direction and which are mechanically connected and integrated are different between the box-type steel main girder and the I-type steel main girder. Even if the steel main girders in the superstructures adjacent to each other in the bridge axis direction are mechanically connected to each other through the steel cross girders in the direction orthogonal to the bridge axis to integrate them, thereby making it jointless. it can.

  In addition, even if at least one of the steel main girders that are provided in the upper structures adjacent to each other in the bridge axis direction and are mechanically connected and integrated are both box-type steel main girders, The box-shaped steel main girders in the upper structure adjacent to each other in the bridge axis direction can be mechanically connected to each other through the steel cross girders and integrated to form a jointless structure.

  Even if the structure of the box-shaped steel main girders provided in the upper structures adjacent to each other in the bridge axis direction is the same, the strength of the connecting portion is not sufficient even if the box-shaped steel main girders are simply connected, Although it may not be possible to sufficiently transmit the cross-sectional force acting on the upper structure, the box-shaped steel main girders in the upper structures adjacent to each other in the bridge axial direction are mechanically connected to each other through the steel cross girders in the direction orthogonal to the bridge axis. , The cross-sectional force acting on the upper structure can be integrated so as to be sufficiently transmitted.

  The steel main girder, in which one steel main girder is composed of a box-shaped steel main girder with a box-shaped cross section and the other steel main girder is composed of an I-shaped steel main girder with an I-shaped cross section, in the axial direction , And at least one of the positions may be different, and in the case where both are composed of the box-shaped steel main girders, at least one of the cross-sectional shape, the axial direction, and the position of the box-shaped steel main girders may be different. .

  Further, if one of the steel main girders to be mechanically integrated in the upper structures adjacent to each other in the bridge axis direction is the box-type steel main girder, the steel main girder provided in the upper structure is I It may be configured by only the section steel main girder or the box-type steel main girder, or at least one of them may include both the I-type steel main girder and the box-type steel main girder.

This invention, in the upper structure of the steel girder bridges, it is possible to provide a connecting method in the already設鋼digits bridges configuration by connecting the different steel main beam together integrally, Ru can jointless reduction.

The perspective view of the steel girder bridge connected by the connection structure of this invention. The perspective view of the existing steel girder bridge of conventional structure. Flowchart of connection method for existing steel girder bridge. Explanatory drawing in connection method in existing steel girder bridge. Explanatory drawing about the connection structure which connects I type steel main girders. Explanatory drawing about another connection structure which connects I type steel main girders. Explanatory drawing about further another connection structure which connects I type steel main girders. Explanatory drawing about the connection structure which connects an I-type steel main girder and a box-type steel main girder. Explanatory drawing about the connection structure which connects box-shaped steel main girders.

An embodiment of the present invention will be described in detail below with reference to the drawings.
1 shows a perspective view of a steel girder bridge 1 connected by a connecting structure of the present invention, FIG. 2 shows a perspective view of an existing steel girder bridge 1a of a conventional structure, and FIG. 3 shows a connecting method of an existing steel girder bridge 1a. Fig. 4 shows a flow chart, and Fig. 4 shows an explanatory view of the connecting method for the existing steel girder bridge 1a.

  Specifically, Fig. 4 (a) shows a perspective view of the cutting / removing process of cutting / removing the cutting / removing portion of the existing steel girder bridge 1a, and Fig. 4 (b) shows the cutting / removing of the existing steel girder bridge 1a. The perspective view of the horizontal girder installation process which installs the connection box type horizontal girder 60 in the removal location is shown.

  5 shows an explanatory view of a connecting structure for connecting the I-type steel main girders 20 to each other, FIG. 6 shows an explanatory view of another connecting structure for connecting the I-type steel main girders 20 to each other, and FIG. FIG. 8 shows an explanatory view of yet another connecting structure for connecting the shape steel main girders 20 to each other, FIG. 8 shows an explanatory view of a connecting structure for connecting the I-type steel main girder 20 and the box-shaped steel main girder 30, and FIG. The explanatory view about the connection structure which connects box type steel main girders 30 comrades is shown.

  More specifically, FIG. 5A shows a plan view of an existing steel girder bridge 1a in which the number of I-type steel main girders 20 provided in adjacent upper structures 2a and 2b along the bridge axis direction L is different, and FIG. FIG. 5B shows a plan view of the steel girder bridge 1 in which I-type steel main girders 20 having different numbers are connected by a connecting box-type girder 60, and FIG. The top view of the steel girder bridge 1 connected by the girder 50 is shown.

  Moreover, FIG. 6A shows a plane of the existing steel girder bridge 1a where the number of I-type steel main girders 20 provided in the upper structures 2a and 2b adjacent to each other along the bridge axial direction L is different and the axial direction Lb intersects. FIG. 6B shows a plan view of a steel girder bridge 1 in which the number of I-type steel main girders 20 intersecting with each other in the axial direction Lb is connected by a connecting I-type horizontal girder 50, while the number of wires is different.

  Furthermore, Fig.7 (a) shows the top view of the existing steel girder bridge 1a from which the cross-sectional shape of the I-shaped steel main girder 20 with which the upper structures 2a and 2b which adjoin along the bridge axial direction L differ is shown, and FIG. 7B is an enlarged cross-sectional view taken along the line AA in FIG. 7A, and FIG. 7C is a plan view of a steel girder bridge 1 in which I-type steel main girders 20 having different cross-sectional shapes are connected by a connecting box-type girder 60. FIG. 7 (d) is an enlarged cross-sectional view taken along line BB in FIG. 7 (c).

  Further, FIG. 8 (a) shows an existing steel girder having the I-type steel main girder 20 and the other having the box-type steel main girder 30 provided for the upper structures 2a and 2b adjacent to each other along the bridge axis direction L. FIG. 8B shows a plan view of the bridge 1a, and FIG. 8B shows a plan view of the steel girder bridge 1 in which one I-type steel main girder 20 and the other box-type steel main girder 30 are connected by a connecting box-type girder 60. 8 (c) shows a plan view of a steel girder bridge 1 in which one I-type steel main girder 20 and the other box-type steel main girder 30 are connected by a connecting I-type girder 50.

  Further, FIG. 9 (a) is a plan view of an existing steel girder bridge 1a in which upper structures 2a, 2b adjacent to each other along the bridge axis direction L both have a box-shaped steel main girder 30, and FIG. 9 (b) shows a box. The top view of the steel girder bridge 1 which connected the type steel main girder 30 with the connection box type girder 60 is shown, and FIG.9 (c) shows the steel girder bridge 1 which connected the box type steel main girder 30 with the connection I type girder 50. The top view is shown.

  The steel girder bridge 1 includes a plurality of upper structures 2 arranged along the bridge axis direction L and adjacent upper structures 2a and 2b among the plurality of upper structures 2 arranged along the bridge axis direction L. The lower structure 3 is disposed between the lower structure 3 and the lower structure 3, and the support device 4 is disposed on the upper surface of the lower structure 3 to support the upper structure 2 by the lower structure 3.

  In the embodiment, the upper structure on the starting side (upper right side in FIGS. 1 and 2) in the bridge axis direction L is the starting upper structure 2a, and the upper structure on the end side (lower left side in FIGS. 1 and 2). Is designated as the end point side upper structure 2b.

  The lower structure 3 is a bridge pier made of concrete or steel and arranged at a predetermined distance along the bridge axis direction L, and a support device 4 for supporting the upper structure 2 is provided on the upper surface thereof. The upper structure 2 is formed with a length according to the distance between the lower structures 3, and is supported by a supporting device 4 provided on the upper surface of the lower structure 3. The support device 4 for supporting the upper structure 2 supports the steel main girders (20, 30) provided in the upper structure 2, so that the position and size of the steel main girders (20, 30) are determined. It is provided according to.

  The upper structure 2 includes a steel main girder (20, 30) arranged in the bridge axis direction L, and a portion W between the starting-side upper structure 2a and the ending-side upper structure 2b that is perpendicular to the bridge axis direction W. The horizontal cross girders (50, 60) arranged toward each other, a steel main girder (20, 30) and a floor slab (not shown) fixed to the upper surface side of the horizontal cross girders (50, 60), Is composed of pavement (not shown) and auxiliary equipment (not shown) laid on the upper surface of the floor slab. The connecting transverse girders (50, 60) are arranged over the entire width in the direction W perpendicular to the bridge axis of the upper structure 2.

The steel main girders (20, 30) arranged on the bottom surface side of the floor slab in the upper structure 2 are arranged at predetermined intervals in the direction W perpendicular to the bridge axis, and a plurality of them are arranged along the bridge axis direction L. Book placement.
In the present embodiment, the steel main girders (20, 30) include an I-shaped steel main girder 20 having an I-shaped cross section and a box-shaped steel main girder 30 having a box-shaped cross section, and the required performance of the upper structure 2 can be improved. Accordingly, the I-shaped steel main girder 20 and the box-shaped steel main girder 30 are selected and configured with appropriate intervals and required cross-sectional sizes.

  More specifically, in the starting-side upper structure 2a, I-type steel main girders 20 are arranged on both sides in the direction W perpendicular to the bridge axis, and a box-type steel main girder 30 having a girder height higher than that of the I-type steel main girder 20a is arranged in the center. ing. In the end-side upper structure 2b, I-type steel main girders 20b having a girder height higher than that of the I-type steel main girders 20a are arranged on both sides and in the center in the direction W perpendicular to the bridge axis.

  The I-shaped steel main girder 20 (20a, 20b) is composed of a cross-sectional I-shaped steel in which horizontal flanges 21 are arranged at predetermined intervals in the vertical direction and a web 22 that connects the flanges 21 is provided. Further, a plurality of ribs 23 connected to both flanges 21 are provided along the web 22 at predetermined intervals in the longitudinal direction (bridge axis direction L).

  The box-shaped steel main girder 30 includes an upper surface portion 31 formed of a steel plate material having a predetermined strength, a bottom surface portion 32 arranged at a predetermined distance from the upper surface portion 31, an upper surface portion 31 and a bottom surface portion 32. It is a box-shaped cross-section having a space inside with the side surface portion 33 that connects the two, and an appropriate rib (not shown) is provided in the internal space.

The connecting transverse girders (50, 60) arranged on the bottom side of the floor slab in the upper structure 2 are arranged along the direction perpendicular to the bridge axis W in the portion where the starting-side upper structure 2a and the ending-side upper structure 2b face each other. Are arranged.
Note that, as the connecting transverse girders, there are a connecting box type transverse girder 60 having a box-shaped cross section shown in FIG. 1 and a connecting I type transverse girder 50 having an I-shaped cross section shown in FIG. 5C, for example.
The connection I-shaped cross beam 50 is composed of a cross-section I-shaped steel in which horizontal flanges are arranged at predetermined intervals in the vertical direction and a web connecting the flanges is provided.

The connecting box type cross girder 60 illustrated in FIG. 1 includes an upper surface portion 61 made of a steel plate material having a predetermined strength, a bottom surface portion 62 arranged at a predetermined distance from the upper surface portion 61, and an upper surface. It is a box-shaped cross section having a space inside with the side surface portion 63 connecting the portion 61 and the bottom surface portion 62, and an appropriate rib (not shown) is provided in the internal space. In this embodiment, the connection box type horizontal girder 60 has a girder height matched with the girder height of the I-type steel main girder 20b.
The connection I-type cross girder 50 and the connection box-type cross girder 60 are selected based on the cross-sectional structure that functions as a cross girder member having rigidity required as a cross-section force transmitting member.

The connecting horizontal girders (50, 60) and the steel main girders (20, 30) are connected and integrated.
More specifically, as shown in FIG. 1, the end of the web 22 of the I-type steel main girder 20a and the box-type steel main girder with respect to the side surface 63a (see FIG. 7D) on the starting side of the connection box-type girder 60. The side surface part 33 of 30 is abutted and connected, and the end part of the I-type steel main girder 20b is abutted and connected to the side surface 63b on the end point side of the connection box type horizontal girder 60.

  At this time, the flange 21 on the upper side of the I-type steel main girder 20 and the upper surface portion 31 of the box-shaped steel main girder 30 are aligned with the upper surface portion 61 of the connecting box-type horizontal girder 60, and fillets are provided at the corners for connection. In addition, the bottom surface portion 32 of the box-shaped steel main girder 30 and the lower flange 21 of the I-shaped steel main girder 20b are aligned with the bottom surface portion 62 of the connection box-type horizontal girder 60, and fillets are provided at the corners for connection.

  On the other hand, the flange 21 on the bottom side of the I-type steel main girder 20a having a girder height lower than that of the connecting box-type girder 60 is connected to the middle position in the height direction on the side surface 63a on the starting point side. The I-type steel main girder 20, the box-type steel main girder 30, and the connecting box-type girder 60 may be connected by a splice plate (friction plate) and friction-bonded with a high-strength bolt or the like. You may join by a joining method.

  Also, the same shape as the steel main girders (20, 30) facing each other so as to project from the side surface 63a on the starting side and the side surface 63b on the ending point side of the connecting box type horizontal girder 60 toward the starting side and the ending side, respectively. A steel member having an end portion of the steel main girder (20, 30) is provided in advance so as to have the same axial direction as the steel main girder (20, 30), and the end portion of the steel member and the end portion of the steel main girder (20, 30) are Friction welding may be performed with a high-strength bolt or the like using a splice plate, or other welding methods may be used.

  In this way, by the connecting structure in which the steel main girders (20a, 20b, 30) arranged along the bridge axis direction L are connected to the connecting box type girders 60 arranged along the bridge axis orthogonal direction W. The starting-side upper structure 2a and the ending-side upper structure 2b can be jointless.

  As described in detail below, the steel girder bridge 1 shown in FIG. 1 may be constructed by constructing the above-described connection structure on the existing steel girder bridge 1a having the conventional structure, or the newly constructed steel girder bridge 1a. In, the above-mentioned connection structure may be constructed.

Next, a method of connecting the existing steel girder bridge 1a having the conventional structure to the above-described connecting structure will be described.
The existing steel girder bridge 1a that constructs the above-described connection structure is provided in the upper structure 2 in the description of the steel girder bridge 1 described above along the bridge axial direction L, in addition to the above-mentioned steel main girders (20, 30). At the ends of the arranged steel main girders (20, 30), the horizontal connecting members 70 for connecting the steel main girders (20a and 30, 20b) in the direction W perpendicular to the bridge axis and the expansion device (not shown) are provided. It is arranged.

  Specifically, as shown in FIG. 2, end points of the I-type steel main girder 20a and the box-type steel main girder 30 of the starting-side upper structure 2a and the starting points of the I-type steel main girder 20b of the ending-side upper structure 2b. The end portion on the side faces in the bridge axial direction L and is separated by a predetermined distance.

  In order to construct the above-mentioned connection structure with respect to the existing steel girder bridge 1a having such a structure, first, the vent 100 is provided on each of the starting side and the ending side of the lower structure 3 (see FIG. 4 (a)). By assembling a jack or a jack, the starting point side of the cutting point c (illustrated by the dotted line in FIG. 2) of the I-type steel main girder 20a and the box-type steel main girder 30 and the end point side of the cutting point c of the I-type steel main girder 20b are bent. Temporarily support 100 (step s1).

  As shown in FIG. 4A, the opposite ends of the steel main girders (20, 30) that are temporarily supported by the vent 100 are cut at cutting points c and removed (step s2). In the upper structure 2, the floor slab, the pavement, the expansion / contraction device, the auxiliary equipment, and the support device 4, which are not shown, are appropriately removed in accordance with the cutting of the end portion.

  Then, as shown in FIG. 4 (b), a required number of supporting devices 4 are installed on the upper surface of the lower structure 3, and a connecting box-type cross girder 60 is bridged at a position where the end is cut and removed. The steel main girders (20, 30) are connected to the installed connection box type cross girder 60 (step s4) along the axis-perpendicular direction W (step s3). Since the connecting box type horizontal girder 60 connecting the steel main girders (20, 30) is supported by the supporting device 4 of the lower structure 3, the vent 100 is disassembled and removed (step s5), and then removed. Construction of the connection structure is completed by restoring the floor slab, pavement and incidental equipment.

  In this way, the upper structure 2 provided with the steel main girders (20, 30) arranged at a predetermined interval in the direction W perpendicular to the bridge axis and extending in the direction L of the bridge axis is arranged along the direction L of the bridge axis. As a connecting structure of a plurality of arranged steel girder bridges 1 and 1a, a connecting box-type girder 60 arranged along the bridge axis orthogonal direction W between the upper structures 2a and 2b adjacent to each other along the bridge axis direction L Since the steel main girders (20, 30) are connected to each other, the upper structures adjacent to each other along the bridge axis direction L via the connecting box-type cross girders 60 arranged along the bridge axis perpendicular direction W. The steel main girders (20, 30) in 2 are mechanically connected to each other to be integrated, and the upper structures 2a, 2b having different configurations of the steel main girders (20, 30) can be jointless. Further, it is possible to change from two supporting lines in the existing steel girder bridge 1a to one supporting line for supporting the connection box type lateral girder 60, and the maintainability is improved.

  In addition, a plurality of upper structures 2 are arranged along the bridge axis direction L, which are arranged at predetermined intervals in the bridge axis direction W and are provided with steel main girders (20, 30) extending in the bridge axis direction L. As a connecting method for the existing steel girder bridge 1a, a steel main girder for cutting the ends of the steel main girders (20, 30) on the opposite sides in the upper structures 2a, 2b adjacent along the bridge axial direction L Steel transverse girder arrangement step (step s2) of arranging the connecting box type transverse girder 60 along the direction W perpendicular to the bridge axis in the space cut in the cutting step (step s2) and the steel main girder cutting step (step s2) s3) and the main girder connecting step (step s4) of connecting the steel main girders (20, 30) to the connecting box type cross girder 60 (step s4) are performed in this order. Therefore, even with the existing steel girder bridge 1a, Adjacent along the bridge axis direction L via the connecting box type cross girders 60 arranged along the bridge axis orthogonal direction W In the upper structures 2a and 2b, the box-shaped steel main girder 30 and the I-type steel main girder 20b, or the I-type steel main girder 20a and the I-type steel main girder 20b having different girder heights are mechanically connected and integrated to form a steel main It is possible to make the upper structures 2a and 2b having different configurations of the girders (20, 30) jointless.

More specifically, in the starting-side upper structure 2a and the ending-side upper structure 2b that are adjacent to each other along the bridge axis direction L, the starting-side upper structure 2a is composed of an I-type steel main girder 20a and a box-type steel main girder 30. , The end-side upper structure 2b is composed of only the I-type steel main girders 20b, but the adjacent upper parts along the bridge axis direction L via the connecting box-type cross girders 60 arranged along the bridge shaft right angle direction W. The steel main girders (20, 30) in the structures 2a and 2b can be mechanically connected to each other and integrated, and the starting-side upper structure 2a and the ending-side upper structure 2b can be jointless.
Further, the steel main girders (20, 30) in the upper structures 2a, 2b adjacent to each other along the bridge axis direction L are mechanically connected to each other through the connecting box type girder 60 having a desired strength to be integrated. Can be made jointless.

In the correspondence between the configuration of the present invention and the embodiment, the upper structure of the present invention corresponds to the upper structure 2, the starting point side upper structure 2a, and the ending point side upper structure 2b,
And so on
Steel cross girders correspond to connected cross girders (50, 60),
I type steel cross girder corresponds to the connected I type cross girder 50,
Box-shaped steel girder corresponds to the connection box-shaped girder 60,
The steel main girder cutting process corresponds to step s2,
The steel cross beam arrangement process corresponds to step s3,
Although the main girder coupling step corresponds to step s4, the present invention is not limited to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many implementations are possible. Can be obtained.

  For example, in the above description, the starting-side upper structure 2a composed of the I-type steel main girder 20a and the box-shaped steel main girder 30 having a small girder height, and the end-side upper structure 2b composed of the I-type steel main girder 20b. 5 and 6 are connected by the above-described connecting structure to form a jointless structure. However, as shown in FIG. 5A, since the number of I-type steel main girders 20 provided in the upper structures 2a and 2b is different, the starting-side upper structure Even if the existing steel girder bridge 1a has different positions in the direction W perpendicular to the bridge axis between the I-type steel main girder 20a of the object 2a and the I-type steel main girder 20b of the end point side upper structure 2b, the position in the direction W perpendicular to the bridge axis is A connecting box-type girder 60 (FIG. 5 (b)) and a connected I-type girder 50 (FIG. 5 (c) in which different I-type steel main girders 20a and I-type steel main girders 20b are arranged along the direction W perpendicular to the bridge axis. )), The connection box type cross girder 60 is arranged along the direction W perpendicular to the bridge axis (FIG. 5 (b)). And the I-type steel main girder 20a and the I-type steel main girder 20b are mechanically connected and integrated via a connecting I-type horizontal girder 50 (FIG. 5 (c)) to form a starting side upper structure 2a and an end side upper structure. The object 2b can be made jointless.

  Furthermore, as shown in FIG. 6A, the number of I-type steel main girders 20 provided in the upper structures 2a and 2b is different, and the axial direction Lba of the starting-side upper structure 2a and the end-side upper structure are different. Even in the existing steel girder bridge 1a that intersects the axial direction Lbb of 2b at a predetermined angle or more, as shown in FIG. 6 (b), the position of the bridge axis perpendicular direction W is different and the axial direction Lb is different I By connecting the section steel main girders 20a and the I type steel main girders 20b to the connecting I-type cross girders 50 arranged along the direction W perpendicular to the bridge axis, the connecting I-type lateral girders arranged along the direction W perpendicular to the bridge axis are provided. The I-type steel main girder 20a and the I-type steel main girder 20b can be mechanically linked and integrated via the girder 50, and the starting-side upper structure 2a and the end-side upper structure 2b can be jointless.

  In the case of the existing steel girder bridge 1a in which the axial direction Lba of the starting point side upper structure 2a and the axial direction Lbb of the ending point side upper structure 2b intersect at a predetermined angle or more, the connecting I-type transverse girder 50 is connected to the bridge axis right angle. The connection I-type girder 50 may be arranged not only in the direction W but also obliquely with respect to the bridge axis right-angle direction W according to the intersection angle between the axial direction Lba and the axial direction Lbb.

  Further, as shown in FIG. 6A, not only when the axial direction Lba of the starting point side upper structure 2a and the axial direction Lbb of the ending point side upper structure 2b intersect in the horizontal direction, but also in the vertical direction or diagonal direction. It may be a case of intersecting in the direction. Further, the tangent direction and the curvature may change between the starting-side upper structure 2a and the ending-side upper structure 2b in the curved section.

  Further, as shown in FIGS. 7 (a) and 7 (b), although the upper structures 2a and 2b are composed of only the same number of I-type steel main girders 20, the girder height of the constituent I-type steel main girders 20 is the starting point. Even if the existing steel girder bridge 1a is different between the I-type steel main girder 20a of the side upper structure 2a and the I-type steel main girder 20b of the end side upper structure 2b, as shown in FIGS. 7 (c) and (d). By connecting the I-type steel main girder 20b and the I-type steel main girder 20a having a low girder height to the connection box type girder 60 arranged along the direction W perpendicular to the bridge axis, The I-type steel main girder 20a and the I-type steel main girder 20b are mechanically connected and integrated through the connecting box type cross girder 60 arranged, and the starting-side upper structure 2a and the end-side upper structure 2b are jointed. It can be made less.

Further, as shown in FIG. 8 (a), an existing steel girder bridge 1a composed of an end-side upper structure 2b composed of the I-type steel main girder 20b and a starting-side upper structure 2a composed of the box-shaped steel main girder 30. 8B and 8C, the I-type steel main girder 20b of the end-side upper structure 2b and the box-type steel main girder 30 of the starting-side upper structure 2a are connected at right angles to the bridge axis. By connecting to the connection box type girder 60 and the connection I type girder 50 arranged along the direction W, the connection box type girder 60 and the connection I type girder arranged along the direction W perpendicular to the bridge axis The I-type steel main girder 20b and the box-type steel main girder 30 can be mechanically connected and integrated via 50, and the starting-side upper structure 2a and the end-side upper structure 2b can be jointless.
In addition, with respect to one box-type steel main girder 30, a plurality of I-type steel main girders 20b are provided through a connecting box-type girder 60 and a connecting I-type girder 50 arranged along the direction W perpendicular to the bridge axis. May be connected and unified.

  Furthermore, as shown in FIG. 9 (a), even if the starting side upper structure 2 a and the ending side upper structure 2 b are both existing steel girder bridges 1 a configured by the box-shaped steel main girders 30, FIG. As shown in b) and (c), the box-shaped steel main girder 30 of the end point side upper structure 2b and the box-shaped steel main girder 30 of the starting point side upper structure 2a are arranged along the direction W perpendicular to the bridge axis. By connecting to the connection box type cross girder 60 and the connection I type cross girder 50, the box type steel main girder is connected through the connection box type cross girder 60 and the connection I type cross girder 50 arranged along the direction W perpendicular to the bridge axis. It is possible to mechanically connect the 30 members to each other and integrate them, so that the starting-side upper structure 2a and the ending-side upper structure 2b can be jointless.

  Further, as shown in FIG. 9, even if the box-shaped steel main girders 30 provided in the upper structures 2a and 2b adjacent to each other in the bridge axis direction L have the same configuration, the box-shaped steel main girders in FIG. Even if the opposite ends of the girder 30 are connected by a rib material or the like, the strength of the connecting portion is not sufficient and the cross-sectional force acting on the upper structure 2 cannot be transmitted sufficiently, but along the direction W perpendicular to the bridge axis. By mechanically connecting the box-shaped steel main girders 30 with each other through the connected box-type girders 60 and the connected I-type girders 50, the cross-section force acting on the upper structure 2 can be sufficiently transmitted. Can be integrated.

It should be noted that, as compared with the connected I-shaped girder 50, the cross-sectional force acting on the upper structure 2 is higher in transmission performance, and therefore, as shown in FIG. 9B, the connection arranged along the direction W perpendicular to the bridge axis. It is preferable that the box-shaped horizontal girders 60 connect the box-shaped steel main girders 30 to be integrated.
Further, the box-shaped steel main girders 30 that are provided and connected to the upper structure 2 shown in FIG. 9 described above may be different in the cross-sectional size, the axial direction, and the position in the direction W perpendicular to the bridge axis.

  Further, in the above description, the connection transverse girders (50, 60) are provided over the entire width along the bridge axis right-angled direction W arranged between the upper structures 2a, 2b adjacent to each other along the bridge axis direction L. However, if the cross-sectional force acting on the upper structure 2 can be sufficiently transmitted, the connecting transverse girders (50, 60) are arranged only in a part in the direction W perpendicular to the bridge axis to make the steel main girders (20, 30). ) May be connected.

1 ... Steel girder bridge 1a ... Existing steel girder bridge 2 ... Upper structure 2a ... Starting side upper structure 2b ... End side upper structure 20, 30 ... Steel main girder 20, 20a, 20b ... I type steel main girder 30 ... Box steel main girders 50, 60 ... Connection girder 50 ... Connection I type girder 60 ... Connection box type girder L ... Bridge axis direction W ... Bridge axis right angle direction

Claims (4)

A method for connecting existing steel girder bridges in which a plurality of superstructures having steel main girders in the bridge axis direction, which are arranged at predetermined intervals in the direction perpendicular to the bridge axis, are arranged in the bridge axis direction,
A steel main girder cutting step of cutting the steel main girder on the opposite side in the upper structure adjacent to each other in the bridge axis direction,
In the space cut in the steel main girder cutting step between the upper structures adjacent to each other in the bridge axis direction, a steel cross girder arrangement step of arranging the steel cross girders in the direction perpendicular to the bridge axis,
A method for connecting existing steel girder bridges, in which a main girder connecting step of connecting the steel main girder to the steel cross girder is performed in this order. The method for connecting existing steel girder bridges according to claim 1 , wherein the steel transverse girder is an I-shaped steel transverse girder having an I-shaped cross section or a box-shaped steel transverse girder having a box-shaped cross section. The steel main girders in the upper structures adjacent to each other in the bridge axis direction are both I-type steel main girders having an I-shaped cross section,
At least one of the cross-sectional shape, the axial direction, and the position of at least one of the I-type steel main girders arranged in the direction perpendicular to the bridge axis is at least one of the upper portions adjacent to each other in the bridge-axis direction. The method for connecting existing steel girder bridges according to claim 1 or 2 , wherein the structures are different. One of the steel main girders in the upper structure adjacent to each other in the bridge axis direction is a box-shaped box steel main girder, and the other steel main girder is an I-type steel main girder or box with an I-shaped cross section. The method for connecting existing steel girder bridges according to claim 1 or 2 , which is a main steel girder.

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