JP2007009517A - Continuous girder structure of multispan girder bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure high-strength bending resistance, shear resistance, and an axial force between girder ends of left span main girders and right span main girders. <P>SOLUTION: According to the continuous girder structure of the multispan girder bridge, girder ends 3a of a plurality of the left span main girders 3 and the girder ends 3a of the right span main girders 3 are borne to a common pier 2, and a span complementary girder 5 is arranged so as to extend between side surfaces of the girder ends 3a of the left span main girders 3 and side surfaces of the girder ends 3a of the right span main girders 3, and the girder ends 3a of the left span main girders 3, the girder ends 3a of the right span main girders 3, and the span complementary girder 5 are embedded in a connecting concrete slab 7 formed by placing concrete on the pier 2, to thereby connect both the girder ends 3a to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a continuous girder structure in a multi-span girder bridge in which a plurality of left span main girder ends and a plurality of right span main girder ends are supported on a pier.

  For multi-girder girder bridges that support the girder ends of multiple left span main girder and the right girder main girder on a common pier, the girder end face of the left span main girder and the right The gap between the end faces of the span span girder is discontinuous on the pier, that is, the gap between the span spans, and no stress is transmitted from the left span span main girder to the right span span main girder. There is a problem of lack of bending strength and shear strength between the main girder between the right span and the right span.

In Patent Document 1, the ends of multiple left span main girders and multiple right span main girders are connected with cross beams made of reinforced concrete in the bridge width direction to solve the above problem. It is said.
JP 2003-253621 A

  However, the method of connecting between the end of a plurality of left span main girders and the end of a plurality of right span main girders simply by a reinforced concrete cross beam in the bridge width direction shown in Patent Document 1 above Therefore, it is impossible to design the required bending strength, shear strength and axial force with respect to the total cross-sectional area of the main girder by the embedded reinforcing bars (total cross-sectional area of the embedded reinforcing bars) in the reinforced concrete cross beam. It is almost powerless for inter-main-beam interpolation strength (bending strength, shear strength and axial force). Therefore, it is difficult to sufficiently function as an anti-fall bridge prevention measure.

  Conventionally, the expansion and contraction absorbing member provided in the gap between the girder end face of the left span main girder and the right span main girder has impaired vehicle travelability, and it is severely damaged during travel, so it is necessary to replace it regularly. It has been.

  The present invention secures sufficient bending strength, shear strength and axial force against earthquakes, etc. between the girder ends of a plurality of left span main girder and the right girder main girder as a measure to prevent a falling bridge. It provides a continuous girder structure in a girder bridge between multiple spans that functions effectively.

  In addition, it is not necessary to provide a stretchable absorbing member in the gap between the girder end face of the left span main girder and the girder end face of the right span main girder, and a continuous girder in a multi-span girder bridge that provides stable vehicle travelability. Provide structure.

  As described above, in multi-girder girder bridges, the girder ends of the multiple left-span main girder and the girder ends of the right-span main girder arranged in parallel in the bridge width direction are supported on a common pier. However, the present invention provides a means for forming a continuous girder structure between the spans between the girder side surfaces of the left girder main girder and the girder side surface of the right girder main girder. Spanning complementary girder extending in parallel with the girder end of the left spanning main girder, the end of the right spanning main girder and the spanning girder of the right spanning span and the interstitial complementing girder are embedded in the connecting concrete board formed at the upper part of the pier. In this way, continuous girder structuring has been achieved.

  In addition, a connecting wire extending in the bridge width direction is inserted between the end of the left span main girder and the left end of the span complementary girder and embedded in the connecting concrete board, and the end of the right span main girder Another connecting wire extending in the bridge width direction is inserted between the right ends of the span-complement girder and buried in the connecting concrete board to reinforce the continuous girder structure.

  The connecting wire is inserted into the connecting concrete board by inserting a bare wire and bonded to the concrete.

  Or, the connecting wire rod loosely inserted into the pipe material extending in the bridge width direction is inserted between the end of the left span main girder and the left end of the span complementary girder and embedded in the connecting concrete board, and the right span By inserting the connecting wire loosely inserted into the other pipe material extending in the bridge width direction between the end of the main girder and the right end of the interstitial complementary girder and burying it in the connecting concrete board, and by tensioning the connecting wire Reinforce the above-mentioned connecting concrete board by applying prestressing force.

  In addition, both ends of the span span girder extend from the top of the pier in the bridge length direction, and both ends of the connecting concrete board in which the span span complement girder is embedded extend from the top of the bridge pier in the bridge length direction to provide bending strength. improves.

  The above span span girder extending across the end of the left span main girder and the end of the right span main girder, the end of the left span main girder, the end of the right span main girder, the end of the right span main girder, and the span complement girder By cooperating with the connecting concrete board in which the burial is embedded, it is possible to secure high strength bending strength, shear strength and axial force between the end of the left span main girder and the end of the right span main girder.

  That is, it effectively functions as a stress transmission structure between the respective diameters, and can significantly enhance the shear strength, bending strength, and axial force between the diameters.

  Further, it is not necessary to provide an expansion / contraction absorbing member that eliminates a gap between the spar end surface of the left span main girder and the spar end surface of the right span main girder, and stable vehicle running performance can be obtained.

  As shown in FIG. 1, a girder bridge is provided with one or more piers 2 between abutments 1 on the opposite bank according to the length of the bridge, and a plurality of main girders 3 made of steel such as H-shaped steel or PC concrete. Are bridged in parallel in the bridge width direction between the abutment 1 and the pier 2 and between the pier 2 and the pier 2 to form a multi-span girder bridge.

  Therefore, the main girder 3 constituting the left span and the main girder 3 constituting the right span for one pier 2 support each girder end 3a on the common pier 2 via the support 4, and A facing interval S is formed between the end faces 3b of the right span main girder 3 and the left span main girder 3, and the bridge span 2 is interrupted by the facing interval S.

  Thus, as shown in FIG. 2 to FIG. 9, as means for achieving a continuous girder structure between the above-mentioned spans, between the girder end 3a of the left span main girder 3 and the girder end 3a of the right span main girder 3 A span complement girder 5 is arranged in That is, the inter-span complementary girder 5 is disposed between the girder ends 3a on the bridge piers 2 of the main girder 3 arranged in parallel in the bridge width direction.

  As shown in FIGS. 2 and 3, the interstitial complementary girder 5 is disposed between the girder end 3 a of the adjacent main girder 3 and the same girder end 3 a. That is, the main girder 3 and the span complement girder 5 are arranged alternately.

  Alternatively, as shown in FIG. 4, a plurality of inter-span complementary girder 5 is disposed between the girder end 3 a of the adjacent main girder 3 and the same girder end 3 a.

  The span span complementary girder 5 has a side surface of the girder end 3a of each left span main girder 3 so as to straddle the opposing distance S between the girder end surface 3b of the left span main girder 3 and the girder end surface 3b of the right span main girder 3. And the side surface of the beam end 3a of each right span main girder 3 extends in parallel.

  The span complementing girder 5 is supported on the pier 2 via a support 6 or connected to the adjacent main girder 3 via a connecting bracket or the like and floated on the pier 2 for support. Alternatively, the inter-span complementary girder 5 is supported on the pier 2 via a temporary receiving member, and the temporary receiving member is removed after the concrete placement described later.

  The left half of the above-mentioned span complement girder 5 is along the side of the girder end 3a of the left span main girder 3, the right half is along the side of the girder end 3a of the right span main girder 3, and the right half and the left half are abbreviated. Along the side surface of each girder end 3a with the same length, the left end and the right end are extended from the bridge pier 2 in the bridge length direction. 5a shows the extension part of this left end and right end. Alternatively, the length of the span complement girder 5 can be accommodated within the width of the bridge pier 2 in the bridge length direction.

  The interstitial complementary girder 5 uses a steel girder such as H-shaped steel or T-shaped steel, or a PC concrete girder.

  As shown in FIG. 5, the main girder 3 and the span complementary girder 5 are arranged in parallel at a distance from each other, and the lower flange 3 d of the main girder 3 and the lower flange 5 c of the span complementary girder 5 extend in the bridge length direction. The joint plate 15 is interposed between the flanges 3d and 5c to form a concrete inflow interval between the upper flanges 3c and 5b, and the interval between the lower flanges 3d and 5c is closed to function as a mold.

  The joint plate 15 hooks the left and right upper hooks 15a protruding from the joint plate 15 in the bridge width direction to the upper surfaces of the adjacent lower flanges 3d and 5c to form the abutting state.

  As an example of the formation of the upper cover 15a, a bolt 16 is formed by placing an upper cover rod 15b such as an L-shaped channel or a T-shaped channel on the upper surface of the joint plate 15 and screwing the upper cover rod 15b from the lower surface of the joint plate 15. Are attached to the joint plate 15, and both ends of the upper cover rod 15 b protrude from both side edges of the joint plate 15 in the bridge width direction to form the upper cover 15 a.

  The joint plate 15 is left in a state where it is coupled to the lower surface of the connecting concrete board 7 or the bolt 16 is released to remove only the joining board 15 so that only the upper bar 15b is embedded in the connecting concrete board 7. can do.

  Concrete is placed in the support area of the girder end 3a of the left span main girder 3 and the girder end 3a of the right span main girder 3, and the span complementary girder 5 is placed in the connected concrete board 7 formed by the placement. Are embedded together with the above-mentioned beam ends 3a.

  That is, the girder end 3a of the left span main girder 3 and the girder end 3a of the right span main girder 3 and the span complementary girder 5 are embedded in a connecting concrete board 7 formed in the upper part of the bridge pier 2 to form a continuous girder structure. Configure. Preferably, substantially the entire length of the inter-span complementary girder 5 is embedded in the connected concrete board 7.

  As shown in FIGS. 2 and 3, the concrete composing the connecting concrete board 7 is filled in a space between the side surface of the spar end 3 a of the main girder 3 and the side surface of the interstitial complementary girder 5. When the H-section steel shown in FIG. 2 is used, concrete constituting the concrete floor slab 8 is continuously placed on the upper flange 3c, and the upper flange 3c is placed in the concrete floor slab 8 or connected concrete. Embedded in the board 7. A pavement 9 is applied to the upper surface of the concrete slab 8.

  As shown in FIG. 3, when a PC concrete girder is used as the main girder 3, concrete composing the connecting concrete board 7 is placed at substantially the same level as the upper surface of the upper flange 3 c of the main girder 3. The space between the beam ends 3a of the main beam 3 and the space-complementary beam 5 is filled, and the pavement 9 is formed by placing the upper surface of the upper flange 3c and the upper surface of the connecting concrete board 7 in one plane.

  The preferred embodiment in the case of using an H-section steel as the span main girder 3 will be further described. As shown in FIG. 2, the main girder 3 and the span complement girder 5 both use the same standard H-section steel. Girder 3 and interstitial complementary girder 5 are arranged in parallel in the bridge width direction so as to alternate, that is, one or more complementary girder 5 are arranged in parallel in the bridge width direction between the girder ends 3a of main girder 3. Then, the upper flange 3c of the main girder 3 and the upper flange 5b of the inter-span complementary girder 5 are arranged on the same plane, and similarly, the lower flange 3d of the main girder 3 and the lower flange 5c of the inter-span complementary girder 5 are co-planar. The concrete is placed through the space between the upper flanges 3c and 5b, and the connecting concrete board 7 is formed so as to be substantially flush with the upper flanges 3c and 5b, including the upper surfaces of the flanges 3c and 5b. Concrete floor on top of connected concrete board 7 8 to form pouring.

  On the other hand, a preferred embodiment in the case of using a PC concrete girder as the span main girder 3 will be described further. As shown in FIG. 3, PC concrete main girder 3 having an upper flange 3c is arranged in parallel in the bridge width direction. In the bridge width direction, one or more interstitial girder 5 made of H-shaped steel is interposed between each PC concrete main girder 3, that is, the main girder 3 and the interstitial girder 5 are alternately arranged. Arranged in parallel, concrete is placed through the space between the upper flanges 3c of the main girders 3, and the upper surface of the upper flange 3c of the main girders 3 and the upper surface of the connecting concrete board 7 are made substantially flush with each other. The upper flange 5b of the inter-span complementary girder 5 is completely embedded in the connected concrete board 7.

  Further, in both the embodiment of FIG. 2 relating to the multi-span girder bridge using the steel main girder 3 and the embodiment of FIG. 3 relating to the multi-span girder bridge using the PC concrete main girder 3, FIG. As shown in FIG. 9, between the beam end 3a of the left span main girder 3 and the left end of the span span complementary beam 5, a connecting wire 10 made of a steel wire material such as a PC cable or a solid wire extending in the bridge width direction is provided. A large number of bridges are inserted at intervals in the bridge length direction and are embedded in the connecting concrete board 7, and extend in the bridge width direction between the beam end 3 a of the right span main girder 3 and the right end of the span span complementary girder 5. A number of other connecting wires 10 made of the steel wire rods are inserted in the bridge length direction at intervals to be embedded in the connecting concrete board 7 to reinforce the continuous girder structure.

  In other words, the connecting wire 10 is inserted so as to pass through the belly plate 3e of the main girder 3 made of H-shaped steel and the belly plate 5d of the complementary girder 5 made of H-shaped steel shown in FIG. 3 is fastened by a nut 12 on the outer surface of the abdominal plate 3e.

  Similarly, the nut 12 is inserted on the outer side surface of the belly plate 3e of the main girder 3 at both ends by being inserted so as to pass through the belly plate 3e of the concrete main girder 3 shown in FIG. 3 and the belly plate 5d of the complementary girder 5 made of H-shaped steel. It is concluded by.

  FIG. 4 shows a case where the interstitial complementary girder 5 is embedded in the connected concrete board 7 in two upper and lower stages. The upper and lower span complementary girder 5 are all H-shaped steel, and the upper span complementary girder so that the upper flange 3c of the main girder 3 and the upper flange 5b of the upper span supplemental girder 5 form the same plane. 5 is disposed with an interval, and the lower span complementary girder 5 is disposed with an interval so that the lower flange 3d of the main girder 3 and the lower flange 5c of the lower span complementary girder 5 form the same plane. The upper span complementary girder 5 is embedded in the upper layer portion of the connecting concrete board 7 and the lower span complementary girder 5 is embedded in the lower layer portion.

  As shown in FIG. 4, two sets of the above-mentioned upper and lower span complementary girder 5 are disposed between adjacent main girders 3 made of H-shaped steel girder or PC concrete girder. Alternatively, a pair of upper and lower span complementary girder 5 is disposed between adjacent main girders 3 made of H-shaped steel girder or PC concrete girder.

  The joint plate 15 can also be used in the embodiment shown in FIG. More specifically, the main girder 3 and the upper and lower span complementary girder 5 are arranged in parallel with a gap, and the lower flange 3d of the main girder 3 and the lower flange 5c of the lower span complementary girder 5 are arranged in the bridge length direction. The extending joint plate 15 is interposed between the flanges 3d and 5c to form a concrete inflow interval between the upper flange 5b and the abdomen plate 3e, and the interval between the lower flanges 3d and 5c is closed to function as a mold.

  The joint plate 15 hooks the left and right upper hooks 15a protruding from the joint plate 15 in the bridge width direction to the upper surfaces of the adjacent lower flanges 3d and 5c to form the abutting state. A specific structure example of the top 15a is as described with reference to FIG.

  The connecting wire 10 is also inserted when the upper and lower two-stage span complementary girder 5 shown in FIG. 4 is used. Specifically, a connecting wire 10 made of a steel wire such as a PC cable or a solid wire extending in the bridge width direction is provided between the beam end 3a of the left span main girder 3 and the left end of the upper span complementary beam 5 in the bridge length. A large number of them are inserted at intervals in the direction and embedded in the upper layer portion of the connecting concrete board 7, and in the bridge width direction between the girder end 3 a of the right span main girder 3 and the right end of the upper span complementary girder 5. A number of other connecting wire rods 10 made of the steel wire rods extending in the bridge length direction are inserted and buried in the upper layer portion of the connecting concrete board 7 to reinforce the continuous girder structure.

  Similarly, a connecting wire 10 made of a steel wire such as a PC cable or a solid wire extending in the bridge width direction is provided in the bridge length direction between the beam end 3a of the left span main girder 3 and the left end of the lower span complementary span 5. A large number of them are inserted at intervals, embedded in the lower layer portion of the connecting concrete board 7, and extending in the bridge width direction between the girder end 3a of the right span main girder 3 and the right end of the lower span complementary girder 5 A number of other connecting wires 10 made of steel wires are inserted in the bridge length direction at intervals to be embedded in the lower layer portion of the connecting concrete board 7 to reinforce the continuous girder structure.

  The upper connecting wire 10 is inserted so as to pass through the abdominal plate 3e of the main girder 3 made of H-shaped steel and the abdominal plate 5d of the upper complementary girder 5 made of H-shaped steel. Fastened with nut 12 on the side.

  Similarly, the lower connecting wire 10 is inserted so as to pass through the abdomen 3e of the main girder 3 made of H-shaped steel and the abdomen 5d of the lower complementary girder 5 made of H-shaped steel, and the abdomen of the main girder 3 at both ends. 3e It fastens with the nut 12 in an outer surface.

  The upper and lower two-stage span-complementing girder 5 and the upper and lower two-stage connecting wire 10 can be similarly implemented in the example using the PC concrete girder shown in FIG.

  As described above, the connecting wire 10 is inserted into the connecting concrete board 7 by inserting a bare wire and bonded to the concrete.

  Alternatively, the connecting wire rod 10 that is loosely inserted into the pipe member 10 ′ extending in the bridge width direction is inserted between the girder end 3 a of the left span main girder 3 and the left end of the span span complementary girder 5 into the joint concrete board 7. The connecting concrete is inserted by inserting a connecting wire 10 that is loosely inserted into another pipe member 10 ′ extending in the bridge width direction between the beam end 3 a of the right span main beam 3 and the right end of the span complementary beam 5. By embedding in the board 7 and tensioning the connecting wire 10, the connecting concrete board 7 is prestressed and reinforced.

  A method of applying a prestressing force using the connecting wire 10 that is loosely inserted into the pipe 10 'is a girder bridge using the H-shaped steel girder 3 shown in FIG. 2 as the main girder 3 and a PC concrete girder shown in FIG. This can be carried out when the girder bridge used as the main girder 3 or the two-stage upper and lower span complementary girder 5 shown in FIG.

  When the connecting wire 10, which is loosely inserted into the pipe 10 ′, is inserted and embedded in the connecting concrete board 7, the pipe 10 ′ is firmly bonded to the concrete, and the connecting wire 10 is axially moved in the pipe 10 ′. It is movable, both ends of the connecting wire 10 protrude from both ends of the tube 10 ′, and nuts 12 are formed on the outer side surface in the bridge width direction of the connecting concrete board 7 via the pressure receiving plates 13 with female threads formed at both ends of the connecting wire 10. Fastening is performed, and a fastening force in the bridge width direction of all the connecting wires 10 is applied to the connecting concrete board 7 to give the prestressing force.

  As an example, as shown in FIG. 6, both ends of the connecting wire 10 are exposed to the outer side surface in the bridge width direction of the connecting concrete board 7 forming the rail 14, and the pressure receiving plate 13 is applied to the outer side surface to cover the nut 12. Tighten.

  As another example, both ends of the connecting wire 10 are tightened with nuts 12 via pressure receiving plates 13 on the outer surfaces of the abdominal plate 3e of the main girder 3 at the left and right ends in the bridge width direction. In this case, concrete is primarily placed on the inner side area of the main girder 3 at the left and right ends of the bridge width direction, and after the setting is hardened, nuts are tightened on the side surfaces of the abdomen plate 3e. Concrete is secondarily cast in the outer side surface region to form a connected concrete board 7 having an integrated structure of the primary and secondary cast concrete, and a nut fastening portion is embedded in the connected concrete board 7.

  In any of the embodiments shown in FIGS. 2 and 3, the connecting concrete board 7 has a solid concrete structure as a whole, or the left span main girder 3 as shown in FIG. In the portion excluding the girder terminal of the right span main girder 3, the hollow structure is not prevented.

  That is, the left hollow portion 7a is formed in the connecting concrete board 7 that is placed between the girder ends 3a of the left span main girder 3, and the left span main girder 3 is placed between the girder ends 3a. The right hollow portion 7a is formed in the connecting concrete board 7, and the opposing space S between the girder terminal of the left span main girder 3 and the girder terminal of the right span main girder 3 and the girder end face 3b is embedded in the solid concrete. The above-mentioned continuous girder structure is formed.

  The left and right hollow portions 7a can be filled with a resin foam 11 such as polystyrene foam. The resin foam 11 is placed between the abdominal plate 3e of the spar end 3a of the main girder 3 and the abdominal plate 5d of the interstitial complementary girder 5, and then concrete is cast to form the connected concrete board 7. The connecting concrete board 7 is divided into an upper layer and a lower layer through a hollow portion 7a. In FIG. 3, the upper end of the abdomen 3e of the main girder 3, the upper flange 3c and the complementary girder 5 are placed in the upper connecting concrete board part. The upper end of the abdominal plate 5d, the upper flange 5b, and the upper connecting wire 10 are embedded, and the lower end of the abdominal plate 3e of the main girder 3 and the lower end of the abdominal plate 5d of the complementary girder 5 and the lower connecting wire 10 are embedded in the lower connecting concrete board. Buried.

  The lower surface of the lower flange 3d of the main girder 3 made of H-shaped steel shown in FIG. 2 and the lower surface of the lower flange 5c of the interstitial complementary girder 5 are exposed from the lower surface of the connecting concrete board 7, and similarly shown in FIG. The lower surface of the abdomen 3e of the PC concrete main girder 3 and the lower surface of the lower flange 5c of the inter-span complementary girder 5 are exposed from the lower surface of the connecting concrete board 7, and the exposed surface of the main girder 3 or the exposed surface of the main girder 3 It supports on the upper surface of the bridge pier 2 via the support 4 and 6 with the exposed surface of the span complement girder 5.

  As described above, both ends of the span complementary girder 5 extend in the bridge length direction from the upper surface of the pier 2, and both ends of the connecting concrete board 7 in which the span complementary girder 5 is embedded from the upper surface of the pier 2. Extends in the bridge length direction to improve bending characteristics and bending strength. Reference numeral 5a denotes an extended portion at both ends of the inter-span complementary girder 5.

  Alternatively, the length of the span complement girder 5 can be set to a length within the width of the bridge pier 2 in the bridge length direction so as to have a span complement function.

  In the present invention, the lower flanges 3d and 5c of the main girder 3 and the complementary girder 5 made of H-shaped steel shown in FIG. 2 are completely embedded in the connecting concrete board 7, and the lower surface of the connecting concrete board 7 is interposed via the support 4. To support.

  Similarly, the lower end surface of the belly plate 3e of the concrete main girder 3 shown in FIG. 3 and the lower flange 5c of the complementary girder 5 are completely embedded in the connected concrete board 7, and the lower surface of the connected concrete board 7 is interposed via the support 4. To support.

  The embedding in the claim means all the embedding states described above.

The side view which outlines a double span girder bridge. Cross-sectional view in the bridge width direction showing a specific example of a continuous girder structure in a multi-span girder bridge using an H-shaped steel girder as a main girder. Bridge width direction sectional drawing which shows the other specific example of the continuous girder structure in the double span girder bridge using a PC concrete girder as a main girder. A is a cross-sectional view in the bridge width direction showing an example in which the span-complementing girder forming the continuous girder structure is arranged in two upper and lower stages, and a case where a joint plate is used, and B is a cross-sectional view in the bridge length direction. FIG. 3 is a cross-sectional view in the bridge width direction illustrating a case where a joint plate is used in the continuous girder structure shown in FIG. 2. The bridge width direction sectional view which shows the specific example of the connecting wire which forms the said continuous girder structure. Sectional drawing shown with the specific example shown in FIG. 2 which carries out the cross-sectional view in a plane the arrangement | positioning state of the main girder and span complementation girder which comprise the said continuous girder structure before concrete placement. Sectional drawing shown with the specific example shown in FIG. 2 which carries out the cross sectional view in the plane of the said continuous girder structure after concrete placement. It is sectional drawing in the bridge length direction of the said continuous girder structure, and is a figure shown with the specific example shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Abutment, 2 ... Pier, 3 ... Main girder (Left span main girder, Right span main girder), 3a ... Girder end, 3b ... Girder end face, 3c ... Upper flange, 3d ... Lower flange, 3e ... Abdomen 4 ... Support, 5 ... Span complementary girder, 5a ... Extension part, 5b ... Upper flange, 5c ... Lower flange, 5d ... Abdominal plate, 6 ... Support, 7 ... Concrete concrete board, 7a ... Hollow part, 8 ... Concrete floor slab, 9 ... pavement, 10 ... connecting wire, 10 '... pipe, 11 ... resin foam, 12 ... nut, 13 ... pressure plate, 14 ... balustrade, 15 ... joint plate, 15a ... left and right top, 15b ... Top rod, 16 ... bolts, S ... opposite spacing.

Claims (4)

The left girder main girder is supported on a common pier with the girder ends of multiple left span main girder parallel in the bridge width direction and the girder ends of multiple right span main girder in parallel in the bridge width direction. The girder complementary girder extending between the girder side surface and the girder side surface of the right span main girder is arranged, and the girder end of the left span main girder, the girder end of the right span main girder, and the span span complementary girder are bridge piers. A continuous girder structure in a multi-span girder bridge characterized in that it is buried in a connected concrete board formed in the upper part and the ends of both girder are connected. The connecting wire extending in the bridge width direction is inserted between the end of the left span main girder and the left end of the span complementary girder and embedded in the connecting concrete board, and the right span main girder end and diameter 2. A continuous girder structure in a multi-span girder bridge according to claim 1, wherein another connecting wire extending in the bridge width direction is inserted between the right ends of the interstitial girder and embedded in the connecting concrete board. Between the end of the left span main girder and the left end of the span span complementary girder, a connecting wire that is loosely inserted into a pipe extending in the bridge width direction is inserted and embedded in the connecting concrete board, and the right span main By inserting a connecting wire that is loosely inserted into another pipe material extending in the bridge width direction between the end of the beam and the right end of the interstitial girder, embed it in the connecting concrete board, and tension the connecting wire. The continuous girder structure in a multi-span girder bridge according to claim 1 or 2, wherein a prestressing force is applied to the connected concrete board to reinforce. Both ends of the span span girder have extension parts that extend in the bridge length direction from the pier top surface, and both ends of the connecting concrete board that embeds the span span girder extend from the top surface of the pier in the bridge length direction. The continuous girder structure in the multi-span girder bridge according to claim 1, further comprising an extending portion extending.

Images