JP6375079B1 - Joint structure of precast composite floor slab perpendicular to the bridge axis and its construction method - Google Patents

Abstract

The present invention provides a joint structure in a direction perpendicular to a bridge axis of a precast synthetic slab that is capable of rapid construction, is excellent in strength, can reduce the amount of interstitial concrete, and is easy to work on site.
[Solution]
A main girder 2 having a length between one diameter, a bottom steel plate 3, a plurality of I-shaped steels 4 on the bottom steel plate 3, and a precast composite panel unit 1 including a floor slab concrete 5 in the direction perpendicular to the bridge axis. It is a joint structure. The joint surface of the floor slab concrete 5 is formed into a concavo-convex shape, and the I-shaped steel 4 is projected from the convex portion 6. At the joint position of one panel unit 1 between adjacent panel units 1, the convex part 6 and the end of the I-shaped steel 4 are located inside the end part of the bottom steel plate 3, and the joint position of the other panel unit 1 is convex. The end portions of the portion 6 and the I-shaped steel 4 protrude outward from the end portion of the bottom steel plate 3. These are abutted so that the convex portions 6 of the floor slab concrete and the ends of the I-shaped steel 4 of both panel units 1 are alternately positioned, and the interstitial concrete 9 is placed in the joint portion.
[Selection] Figure 1

Description

  The present invention relates to a joint structure in a direction perpendicular to a bridge axis of a precast composite floor slab used for a road bridge and the like, and a construction method thereof.

  In the construction of bridges, construction methods capable of rapid construction are expected due to problems such as traffic restrictions and construction costs. In particular, when replacing the floor slabs with the aging of existing bridges, traffic regulation is required, including the area around the existing bridges, and the need for rapid construction is high.

  For example, Patent Document 1 discloses a composite panel structure of steel / concrete that has the required rigidity and reduced manufacturing cost, and a composite panel bridge that uses the composite panel to shorten the construction period and simplify construction. The construction method is described.

In the composite panel described in Patent Document 1, a plurality of stringers serving as main girders arranged at intervals on the bottom surface of the bottom steel plate are fixed, and an I-shaped steel is formed on the top surface of the bottom steel plate in a direction orthogonal to the stringers. This is a structure in which horizontal ribs made of shaped steel such as gibber functions are fixedly arranged at intervals and filled with on-site floor slab concrete so that the horizontal ribs are buried.
Patent Document 2 describes a so-called loop joint that has been frequently used for a joint portion of a precast floor slab in bridge repair work.

  In Patent Document 3, a perforated plate (perforated steel plate gibber) is projected from the joint side end of both precast members to be joined as a durable joint structure capable of joining precast members with high strength. In addition, there is described a joining structure in which a prestress is introduced into a filling portion of a filler by a PC steel material which is filled with a filler in a gap and is inserted into a hole of the perforated plate.

  Patent document 4 relates to a joint structure of a precast floor slab that enables rapid construction in renovation of an existing bridge, etc., by providing a plurality of notches at the end of the joint to form a concavo-convex shape and projecting from the convex part of the precast floor slab. By filling the reinforcing bars for fittings into the recesses of the other precast slab, the filling material is filled, reducing the filling amount of the filling materials and shortening the construction period, A joint structure that does not cause any weak points is described.

  In Patent Document 5, as a connection structure of a precast concrete floor slab, a screw is attached to the tip of the upper joint reinforcing bar and the lower joint reinforcing bar protruding from the main body of the precast concrete floor slab and a nut is attached, or crimping is performed. In the structure in which the concrete is filled between the end faces of the opposing floor slab body with the grips fixed and protruding joint reinforcing bars, a groove-shaped shear key is formed in the center of the end face thickness direction of the floor slab body The structure is described.

JP 2004-137686 A JP 2008-303538 A JP 2009-209600 A JP 2012-225144 A JP2015-001045A

  The invention described in Patent Document 1 is intended to shorten the local construction period and simplify the construction of the bridge of the steel / concrete composite floor slab structure. It is not suitable for rapid construction that shortens to a minimum.

  In the invention described in Patent Document 2, it is difficult to reduce the floor slab thickness due to the problem of the processing of the reinforcing bar forming the loop joint, and the joint strength sufficient only with the reinforcing bar and the filled concrete arranged in the loop joint and the joint part. Is difficult to obtain.

  The invention described in Patent Document 3 uses a perforated steel plate gibel for the joint part, but a precast floor slab must be produced by embedding the perforated steel plate gibber at the joint end, which is expensive to manufacture. Moreover, a joint part tends to become a weak point of strength only with a perforated steel plate gibber, a reinforcing bar and filled concrete.

  In the invention described in Patent Document 4, the joint end of the precast floor slab is seen in a plan view so that it has a concave and convex shape, and the joint rebar protruding from the convex part of the precast floor slab is placed in the concave part of the other precast floor slab. By filling the padding material in a way that fits, the filling amount of the padding material is reduced, the work period is shortened, and no structural weakness is generated in the joint. It cannot be said that the structure is necessarily sufficient for the shearing force acting on the part.

  The invention described in Patent Document 5 is a groove-shaped shear formed on the end face of the floor slab body by attaching a nut or a crimping grip to the tip of the reinforcing bar protruding in the bridge axis direction at the joint to enhance the function of the lap joint. Although the joint portion is integrated by the key portion, the strength of the joint portion is not always sufficient in this case as well.

  The inventions described in Patent Documents 2 to 5 are intended for joints in the bridge axis direction and are supported by a main girder, a bridge pier, an abutment, or the like. The position is not limited to the main girder position. In this case, a large shear strength is required for the joint itself.

  The invention of the present application is intended to solve the above-described problems in the prior art, and is capable of rapid construction on site, and by using a stiffening girder that stiffens a precast composite floor slab. The purpose of the present invention is to provide a joint structure in the direction perpendicular to the bridge axis of a precast synthetic floor slab that can form a joint part excellent in strength, reduce the amount of interstitial concrete, and is easy to work on site, and its construction method. Is.

  The present invention includes a main girder in a bridge axis direction having a length corresponding to one diameter, a bottom steel plate fixed to the upper surface of the main girder, and an upper surface of the bottom steel plate spaced in the bridge axis direction. A plurality of precast composite panel units (hereinafter simply referred to as “panel units”) that are composed of a plurality of shaped steels and floor slab concrete cast on the top surface of the bottom steel plate are arranged in parallel in a direction perpendicular to the bridge axis. The joint structure in the direction perpendicular to the bridge axis of the composite panel bridge that is arranged and connected is devised.

  In the present invention, the joint surface in the direction perpendicular to the bridge axis of the floor slab concrete is formed in a concavo-convex shape in plan view, and the shape steel protrudes from the concavo-convex convex portion of the joint surface, In the joint position of one of the panel units adjacent to each other, the projection and the end of the shape steel are located inside the end of the bottom steel plate, and the joint position of the other panel unit Then, the said convex part and the edge part of the said shape steel have projected outside the edge part of the said bottom steel plate.

  And, on the bottom steel plate of the one panel unit, the protruding portion of the other panel unit and the projecting portion of the end of the shaped steel are the protruding portion of the floor slab concrete and the end of the shaped steel of both panel units. Placed so that the parts are alternately positioned in the direction of the bridge axis, and with the ends of both sections shaped so as to overlap when viewed in the direction of the bridge axis, the interstitial concrete is cast in the joint It is characterized by that.

  In the construction method of the joint portion in the direction perpendicular to the bridge axis of the composite panel bridge of the present invention, after the one panel unit is installed between the abutment and the pier or the pier, the other panel unit is made of a convex portion and a shape steel. The overhanging part of the end is placed on the bottom steel plate of the one panel unit, and it is installed between the abutment or the pier so that the convex part of both panel units and the end of the shaped steel are alternately positioned in the bridge axis direction. Then, the interstitial concrete is placed in the joint so that the ends of both shaped steels overlap when viewed in the bridge axis direction.

  In this invention, the joint surface of the floor slab concrete which comprises a panel unit is formed in an uneven | corrugated shape, and the protrusion part of the shape steel which has the function of the stiffening girder built in the panel unit protrudes from the convex part of this joint surface. This is because the end of the shaped steel fits into the recess of the joint surface of the other panel unit in a form that meshes the concave and convex shape of the joint surface of both adjacent panel units like a finger joint. A strong joint structure can be obtained while reducing the amount of placement concrete to be filled in.

  In the present invention, since the main girder in the bridge axis direction having a length corresponding to one diameter is integrated with the panel unit, the panel unit of the composite floor slab structure made of steel and concrete is placed between the abutment or the pier. When installing, the panel unit itself has sufficient rigidity, so the construction is smooth, and it is possible to place the interstitial concrete in a state where the joint interstitial part is rigidly stable. it can.

  The panel units arranged in parallel in the direction perpendicular to the bridge axis are not limited to cases in which all panel units have an integrated main girder, but some panel units have no main girder. It is also possible to use a unit, that is, a panel unit having as constituent elements a bottom steel plate and a plurality of section steels arranged on the top surface of the bottom steel plate at intervals in the bridge axis direction.

  About the shape of the convex part of the joint surface of the floor slab concrete, if the cross section of the convex part in the direction perpendicular to the bridge axis is an inverted trapezoidal shape that spreads upward, The effect of restricting the upward slipping of the stuffed concrete is obtained.

  In addition, as for the shape of the convex part of the joint surface of floor slab concrete, even if both sides of the cross section in the direction perpendicular to the bridge axis are concave and convex, the restraining effect and integrity of upward slipping of the interstitial concrete are the same The effect of improvement is obtained.

  The cross-sectional shape of the shape steel embedded in the floor slab concrete of the panel unit and having the function of a stiffening girder is not particularly limited, but the shape steel such as I-shape steel is advantageous because of the cross-sectional rigidity, price, and ease of handling. is there. Further, in the case of I-shaped steel, an anchor effect due to the flange shape can be obtained.

  Further, in the present invention, since the steel plate is integrated with the lower surface of the panel unit, it is convenient for production and transportation, and there is an advantage that the waterproofing of the lower surface of the floor slab is high in the installed state.

  In the present invention, since the main girder in the bridge axis direction having a length corresponding to one diameter is integrated with the panel unit, a panel unit having a composite floor slab structure made of steel and concrete is installed between the abutment or the pier. At this time, since sufficient rigidity is ensured in the panel unit itself, the construction is smooth, and it is possible to place the interstitial concrete in a state where the interstitial part interstitial part is rigidly stable.

  In the present invention, the ends of the structural steels having the function of stiffening girders built in the panel units arranged in the direction perpendicular to the bridge axis protrude into the joints between adjacent panel units, and the ends of the structural steels of both panel units. Since the portions are arranged in the joint concrete between the joint portions so as to overlap in the bridge axis direction, a strong joint structure can be obtained.

  Moreover, in this invention, the joint surface of the floor slab concrete which comprises a panel unit is formed in an uneven | corrugated shape, and it becomes a form which the edge part of the shaped steel which has a function of a stiffening girder protrudes from the convex part of this joint surface. Because the end of the shaped steel fits into the concave part of the joint surface of the other panel unit by engaging the concave and convex shape of the joint surface of both adjacent panel units like a finger joint. A strong joint structure can be obtained while reducing the amount of stuffed concrete.

The embodiment of the present invention shows a state where the panel unit is installed on the pier, (a) is a plan view of the installed state, (b) is one panel unit is installed, the other panel Sectional view immediately before the unit is erected, (c) is a sectional view in a state where both panel units are erected. It is the perspective view which showed a mode that the panel unit of between was installed in the state in which the panel unit of both sides was constructed. It is sectional drawing of the bridge axis direction in other embodiment of the joint structure of this invention. It is sectional drawing of the bridge axis direction in other embodiment of the joint structure of this invention. It is sectional drawing of the bridge axis direction in other embodiment of the joint structure of this invention. It is a perspective view which shows the construction procedure in construction of the composite panel bridge to which this invention is applied. It is a perspective view which shows the construction procedure following FIG. It is a perspective view which shows the construction procedure following FIG. It is a perspective view which shows the construction procedure following FIG. It is a perspective view which shows the construction procedure following FIG. It is a perspective view which shows the construction procedure following FIG. It is a perspective view which shows the construction procedure following FIG. It is a perspective view which shows the construction procedure following FIG. It is a perspective view which shows the construction procedure following FIG. It is the perspective view which showed the construction procedure in other embodiment (when some panel units do not have the main girder of a bridge axis direction) of the joint structure of this invention. It is the perspective view which showed the construction procedure following FIG. It is the perspective view which showed the construction procedure following FIG. It is the perspective view which expanded and showed the panel unit used in FIG. It is the perspective view which showed the construction procedure following FIG. It is the perspective view which expanded and showed the panel unit used in FIG.

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a state in which a panel unit 1 (precast composite panel unit) is installed on a bridge pier according to an embodiment of the joint structure of the present invention. FIG. 2 shows that both panel units 1a and 1c are installed. It is the perspective view which showed a mode that the panel unit 1b was constructed in the state.

  The panel unit 1 has a length corresponding to one span (corresponding to a distance between the abutment 11 and the pier 12 or between the adjacent piers 12) as shown in FIG. 2 and FIGS. A main girder 2 in the axial direction, a bottom steel plate 3 fixed to the upper surface of the main girder 2, and a plurality of sections (I-shape in this embodiment) arranged on the upper surface of the bottom steel plate 3 at intervals in the bridge axis direction. Steel 4) and floor slab concrete 5 placed on the upper surface of the bottom steel plate 3 are used as constituent elements.

  This panel unit 1 is installed between the abutment 11 and the pier 12 or the pier 12 and connected in parallel in a direction perpendicular to the bridge axis, and a plurality of spans are installed in the bridge axis direction. A composite panel bridge is constructed.

  The illustrated embodiment is an example in which a bridge floor slab is replaced when the existing bridge is aged, and a cross beam 15 in a direction perpendicular to the bridge axis is placed on the existing support 14 of the pier 12. The main girder 2 constituting the panel unit 1 is constructed between the support 13 installed on the abutment 11 and the cross girder 15 of the pier 12. The portion of the main girder 2 that extends to the cross beam 15 has a shape in which a part of the upper flange side of the main girder 2 is left as a protruding portion 2a. It is placed on the top surface of the.

  The joint surface in the direction perpendicular to the bridge axis of the floor slab concrete 5 constituting the panel unit 1 is formed in a concavo-convex shape in plan view, and the I-shaped steel 4 protrudes from the concavo-convex convex portion 6 of the joint surface. As shown in FIG. 1, at the joint position of one of the panel units 1 adjacent to each other in the direction perpendicular to the bridge axis, the end of the convex portion 6 and the I-shaped steel 4 are more than the end of the bottom steel plate 3. At the joint position of the other panel unit 1, the convex portion 6 and the end of the I-shaped steel 4 protrude outward from the end of the bottom steel plate 3.

  And in the state where the protruding part 6 of the other panel unit 1 and the overhanging part of the end of the I-shaped steel 4 are placed on the bottom steel plate 3 of one panel unit 1, the floor slab concrete of both panel units 1 is placed. With the protrusions 6 and the ends of the I-shaped steel 4 positioned alternately in the direction of the bridge axis, the ends of the both I-shaped steels 4 overlapped when viewed in the direction of the bridge axis. It is installed.

  In the illustrated embodiment, the end portions of the bottom steel plates 3 adjacent to each other at the joint portion are attached to the end portions of the bottom steel plate 3 of one panel unit 1 in advance as shown in FIG. However, the present invention is not limited to this.

  In this way, the ends of the I-shaped steel 4 having the function of a stiffening girder built in the panel unit 1 arranged in parallel to the direction perpendicular to the bridge axis project into the joint between the adjacent panel units 1, and both panel units 1 Since the ends of the I-shaped steel 4 are arranged in the interstitial concrete 9 so as to overlap, a strong joint structure can be obtained.

  In addition, if necessary, a tension member in the bridge axis direction can be arranged in the jointed concrete 9 of the joint portion so as to suppress the protruding concrete 9 in the bridge axis direction.

  Moreover, since the edge part of I-shaped steel 4 fits into the recessed part of the joint surface of the other panel unit 1 in the form which mesh | engages the uneven | corrugated shape of the joint surface of both adjacent panel units 1 like a finger joint, in this part A firm joint structure can be obtained while reducing the amount of placement concrete 9 to be filled.

  FIG. 3 shows a cross-section in the bridge axis direction of a joint portion in another embodiment of the joint structure of the present invention. In the example of FIG. 3, the side surface of the convex portion 6 is tapered so that the cross-sectional shape in the direction perpendicular to the bridge axis of the convex portion 6 of the joint surface of the floor slab concrete 5 constituting the panel unit 1 is an upward trapezoidal shape. Provided.

  By adopting such an inverted trapezoidal cross-sectional shape, an effect of restraining upward slipping of the padded concrete 9 to be placed later on the joint portion is obtained.

  FIG. 4 shows a cross-section in the bridge axis direction of a joint portion in still another embodiment of the joint structure of the present invention. In the example of FIG. 4, in the cross-sectional shape of the convex portion 6 in the direction perpendicular to the bridge axis, both sides are concave and convex so as to restrain the interstitial concrete 9 from being pulled out to the upper portion of the joint portion afterward. The integration of the floor slab concrete 5 and the interstitial concrete 9 is reinforced.

  FIG. 5 shows a case where the unevenness of the uneven shape in the vertical direction on the side surface of the convex portion 6 of the floor slab concrete 5 is reversed with respect to the embodiment of FIG. 4, and the effect is almost the same as the case of FIG.

  FIGS. 6-14 shows the construction procedure in construction of the composite panel bridge to which this invention demonstrated in FIG. 2 is applied, and construction is performed in the following procedures.

(1) Installation of the horizontal beam 15 (see Figs. 6-7)
A support 13 corresponding to the arrangement of the main girder 2 is installed on the abutment 11 from which the existing floor slab has been removed. On the pier 12 side, an existing support 14 is used, and a cross beam 15 in a direction perpendicular to the bridge axis is installed on the support 14.

(2) Installation of panel unit 1a (see Figs. 8-9)
The main girder 2 constituting the panel unit 1a is installed between the support 13 installed on the abutment 11 and the horizontal girder 15 of the pier 12. As described with reference to FIG. 2, the portion of the main girder 2 installed on the horizontal girder 15 has a shape that is notched in such a way that a part of the upper flange side of the main girder 2 is left as the protruding portion 2a. This protruding portion 2 a is installed on the upper surface of the cross beam 15.

  As shown in FIG. 2, the panel unit 1 a has the convex portions 6 and the end portions of the I-shaped steel 4 positioned inside the end portions of the bottom steel plate 3.

(3) Installation of the panel unit 1c (see Figs. 10-11)
Similarly, the panel unit 1c in which the end portions of the convex portion 6 and the I-shaped steel 4 are located inside the end portion of the bottom steel plate 3 is installed between the support 13 on the abutment 11 and the cross beam 15 of the pier 12. To do.

(4) Installation of panel unit 1c (see Figs. 12-14)
A panel unit 1c in which the end portions of the convex portion 6 and the I-shaped steel 4 project outward from the end portion of the bottom steel plate 3 is installed between the support 13 installed on the abutment 11 and the cross beam 15 of the pier 12.

  By installing the panel unit 1b, the convex portions 6 on both sides of the panel unit 1b and the ends of the I-shaped steel 4 are placed on the bottom steel plates 3 of the panel units 1a and 1c on both sides. Adjacent bottom steel plates 3 are joined to each other via a contact plate 7 and bolts 8 as described in FIG.

(5) Placing the interstitial concrete 9 The interstitial concrete 9 shown in FIG. 1 is cast in the concave and convex joints from which the I-shaped steel 4 protrudes from both sides.

  With the above operation, the installation of the floor slab panel of one diameter between the abutment 11 and the pier 12 is completed. For the subsequent span, construction can be basically performed in the same procedure.

  FIGS. 15 to 20 show the construction procedure and the structure of the panel unit when some panel units do not have a main girder in the bridge axis direction as other embodiments of the joint structure of the present invention. .

  Some of the panel units are basically the same as those in the above-described embodiment except that the panel unit 1 ′ having no main beam in the bridge axis direction is used.

(1) Installation of the horizontal girder 15 (see Figs. 15 and 16)
A support 13 according to the arrangement of the main girder 2 is installed on the abutment 11 from which the existing floor slab and bridge girder are removed. As for the installation of the cross beam 15 in the direction perpendicular to the bridge axis on the pier 12, the existing support 14 is used, and the cross beam 15 in the direction perpendicular to the bridge axis is installed on the support 14, as in the above-described embodiment.

(2) Installation of panel unit 1 with main girder 2 integrated (see Figs. 17 and 18)
The main girder 2 constituting the panel unit 1 is installed between horizontal beams 15 installed on the pier 12. In some cases, one end of the panel unit 1 is directly installed on a support on an abutment or a pier without passing through the cross beam 15.

(3) Installation of panel unit 1 'without main girder 2 (see Figs. 19 and 20)
In the present embodiment, a panel unit 1 ′ not having the main beam 2 is also used, and the panel unit 1 ′ having no main beam 2 is installed between the previously installed panel units 1 ′.

  Other configurations and construction procedures are basically the same as those in the above-described embodiment, and thus description of common matters is omitted.

DESCRIPTION OF SYMBOLS 1 ... Panel unit, 2 ... Main girder, 2a ... Protruding part, 3 ... Bottom steel plate, 4 ... I-shaped steel, 5 ... Floor slab concrete, 6 ... Convex part, 7 ... Connecting plate, 8 ... Bolt, 9 ... Between Stuffed concrete,
11 ... Abutment, 12 ... Bridge pier, 13 ... Support, 14 ... Support, 15 ... Horizontal girder

Claims (6)

A main girder in the bridge axis direction having a length corresponding to one diameter, a bottom steel plate fixed to the upper surface of the main girder, and a plurality of plates arranged at intervals on the upper surface of the bottom steel plate in the bridge axis direction The direction perpendicular to the bridge axis of a composite panel bridge in which a plurality of precast composite panel units, each of which includes a structural steel and floor slab concrete placed on the top surface of the bottom steel plate, are arranged in parallel in the direction perpendicular to the bridge axis. The joint structure of
The joint surface in the direction perpendicular to the bridge axis of the floor slab concrete is formed in a concavo-convex shape in plan view, and the shape steel protrudes from the concavo-convex convex portion of the joint surface,
At the joint position of one precast composite panel unit among the panel units adjacent to each other in the direction perpendicular to the bridge axis, the end of the convex portion and the shape steel is located on the inner side of the end of the bottom steel plate, In the joint position of the precast composite panel unit, the protruding portion and the end of the shape steel protrude outward from the end of the bottom steel plate,
On the bottom steel plate of the one precast composite panel unit, the projecting portion of the other precast composite panel unit and the protruding portion of the end of the shape steel are the convex portions of the floor slab concrete of both precast composite panel units and With the ends of the section steels arranged alternately in the direction of the bridge axis and with the ends of both sections shaped so as to overlap when viewed in the direction of the bridge axis, the interstitial concrete is cast into the joint. A joint structure in the direction perpendicular to the bridge axis of a composite panel bridge.   2. The joint structure of the composite panel bridge according to claim 1, wherein a plurality of precast composite panel units are connected in parallel with each other in a direction perpendicular to the bridge axis. Floor slab concrete that does not have a main girder in the axial direction, a bottom steel plate, a plurality of section steels arranged on the top surface of the bottom steel plate at intervals in the bridge axis direction, and is placed on the top surface of the bottom steel plate A joint structure in the direction perpendicular to the bridge axis of a composite panel bridge, characterized in that it is a precast composite panel unit with and as components.   3. A composite panel bridge bridge according to claim 1 or 2, wherein a cross section of the convex portion in the direction perpendicular to the bridge axis has an inverted trapezoidal shape extending upward. Joint structure in the direction perpendicular to the axis.   3. A joint structure in a direction perpendicular to the bridge axis of the composite panel bridge according to claim 1 or 2, wherein both sides of the cross section in the direction perpendicular to the bridge axis of the convex part are uneven. Joint structure.   The joint structure in the direction perpendicular to the bridge axis of the composite panel bridge according to any one of claims 1 to 4, wherein the shape steel is an I-shaped steel. Construction. A construction method for a joint portion in a direction perpendicular to the bridge axis of a composite panel bridge comprising the joint structure in a direction perpendicular to the bridge axis of the composite panel bridge according to any one of claims 1 to 5,
After the one precast composite panel unit is installed between the abutment and the pier or the pier, the other precast composite panel unit is connected to the projecting portion and the protruding portion of the end of the shape steel of the one precast composite panel unit. It is placed on the bottom steel plate, and it is installed between the abutment or the pier so that the convex part of both precast composite panel units and the end of the shape steel are alternately located in the bridge axis direction. A method for constructing a joint part in a direction perpendicular to the bridge axis of a composite panel bridge, characterized in that interstitial concrete is cast in the joint part so as to overlap in the bridge axis direction.