JPH1088519A - Bridge structure - Google Patents

Abstract

(57) [Abstract] [Problem] To provide a bridge structure in which a pier and a bridge main girder are rigidly fixed. SOLUTION: In a bridge structure composed of a pier and a bridge main girder, a projecting portion provided at a bearing point of the bridge main girder is embedded in concrete at an upper part of the bridge pier, and the bridge main girder and the bridge pier are supported. Rigidly fixed at the point. In the reinforced concrete and reinforced concrete pier structure, only the bearing points are covered with reinforcing steel pipes and filled with concrete. When the total length of the pier is a steel pipe pier, the outer periphery of the protrusion inserted into the upper part of the pier steel pipe is filled with concrete and rigidly fixed, or filled with concrete over the entire length of the steel pipe and rigidly fixed. Protrusions are provided on at least one of the outer surface of the protrusion at the bearing point and the inner surface of the steel pipe of the pier at the bearing point. In the steel pipe bridge main girder, concrete is filled into at least a part of the steel pipe in accordance with at least the bearing point and the designed cross-sectional force of the steel pipe of the bridge main girder and noise reduction. Lightweight concrete is preferable for noise reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bridge structure in which a pier and a bridge main girder are rigidly fixed.

[0002]

2. Description of the Related Art Heretofore, a support between a pier and a bridge has a hinge structure in which a hinge is provided at a bearing point, a horizontal distortion is reduced at the bearing point, and rotation and sliding of the beam are expected to some extent. However, in recent years, the size of the structure has been increased, and the manufacturing cost and the maintenance cost of the conventional hinge support structure have become very expensive. In addition, such hinge bearings may cause the cross beams and bridges of the structure to fall during an earthquake. Accordingly, there is a need for a method and a bridge structure for rigidly fixing a bearing girder portion which can reduce the manufacturing cost and its maintenance cost and can avoid the danger of falling during an earthquake, and the following technology is disclosed.

Japanese Unexamined Patent Publication No. 4-92007 discloses a joint structure between a bridge pier and a bridge main girder. A main reinforcing bar of a bridge pier having a threaded portion at the top is penetrated through a bridge steel main girder by a nut. A joining structure for fastening and fixing is described. As a result, the bridge pier and the bridge main girder are integrated, and the load is transmitted. However, in this joining method, since the strength of the main girder joining portion is reduced, a reinforcing member for compensating for the reduced strength is required. Further, complicated and expensive on-site work such as threading of a main reinforcing bar extending from the pier to the main bridge of the bridge, drilling of the main bridge of the bridge, and alignment of the extended main reinforcing bar with the main bridge of the bridge are required.

Japanese Patent Application Laid-Open No. Hei 5-31746 discloses that a joint between upper and lower hollow column inner tubes of a column structure is surrounded by a hollow outer tube, concrete is filled in the hollow outer tube, and the upper and lower hollow column inner tubes are filled. Disclosed is a concrete-filled steel tubular column structure that is joined and integrated. However, this method does not directly integrate the column and the cross beam, and cannot be used as a method for connecting a large heavy structure such as a train, an automobile, or a bridge to which a dynamic load such as a typhoon is applied.

[0005] Normally, to join a beam member and a pier member, a reinforced concrete structural beam is provided in a steel main girder of a steel structural member so as to extend from the top of a reinforced concrete column base and overlap with the main girder. In general, concrete is filled with concrete and joined to form a joint structure. As a result, the steel beam member and the reinforced concrete beam member are integrated, but it is necessary to work the beam member with the main girder and to perform an on-site combined bolting operation or the like.

[0006] In the above prior art, there is provided a joining method in which steel columns or steel bars or steel members of a steel reinforced concrete column are extended and directly joined as beams to be integrated. Therefore, the processing of the steel-frame reinforcement for extending the reinforcing bars or the steel frame members of the steel column structure and the steel-framed reinforced concrete column structure into each other in the structure and the extension work on site become complicated.

[0007]

As described above, due to the enlargement of the bridge structure, the support of the structure increases the manufacturing cost and the maintenance cost in the conventional hinge support structure. Includes problems such as falling. In order to solve these problems, a method of replacing the hinge support structure with a rigid fixing structure has been recently proposed. However, the conventional rigid fastening structure has a problem that the additional machining of the steel rebar and the extension work on site are complicated. The present invention is directed to a rigidly connected bridge structure that does not require these additional machining and on-site extension work.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bridge structure comprising a pier and a bridge main girder, wherein a projecting portion provided at a bearing point of the bridge main girder is embedded in concrete above the bridge pier. This is achieved by a bridge structure characterized by rigidly fixing a main girder and a pier. The above object is also achieved by a bridge structure in which the pier is made of a reinforced concrete pier, and the outer surface of a bearing point of the pier is covered with a reinforcing steel pipe and filled with concrete.

The above object is achieved by a bridge structure in which the entire length of the pier is a steel pipe pier, and the outer periphery of the protrusion inserted into the inner region above the steel pipe is filled with concrete and rigidly fixed. Further, the above object is achieved by a bridge structure in which the entire length of a pier is made of a steel pipe pier, and the entire length of the pier including the upper part of the steel pipe pier is filled with concrete and rigidly fixed.

[0010] Further, the object is to provide a projecting portion on at least one of an outer surface of a projecting portion in contact with concrete at a bearing point and an inner surface of a steel pipe pier in contact with concrete of a pier at the bearing point. Achieved by the provided bridge structure. Furthermore, the above object is achieved by a bridge structure in which the main girder of the bridge is a steel girder main girder.

[0011] Further, the problem is that the main girder of the bridge is a steel girder main girder or a steel girder bridge main girder, and at least a part of the steel girder bridge main girder depends on the bearing point and the sectional force of the steel girder main girder. Is achieved by filling the bridge structure. Further, the above object is achieved by a bridge structure in which the concrete to be filled in the steel pipe bridge main girder of the bridge main girder is lightweight concrete.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In a bridge structure according to the present invention comprising a bridge pier and a bridge main girder, a protrusion provided at a bearing point of the bridge main girder is buried in concrete on the upper part of the bridge pier to form a support for the bridge girder. Rigidly fix the point and the bearing point of the pier. This achieves a rigid frame structure in which the bearings are rigidly fixed. The projecting part provided at the bearing girder of the bridge main girder is embedded in the concrete above the pier, eliminating the need for anchor bolts and other fastening site processing work. A high rigid bearing point can be constructed.

In the case where a large bending moment, a shearing force and a normal stress are applied to the bearing point, and the pier has a reinforced concrete structure, in the present invention, only the outer surface of the bearing point of the reinforced concrete pier is reinforced with a steel pipe. And filling with concrete, it is possible to avoid the tight arrangement of the stirrups, which is a difficult on-site work. The bearing rating means the intersection between the pier and the bridge girder, and the bearing rating means near the intersection between the pier and the bridge girder.

Further, the pier is a steel pipe pier, and only the vicinity of the bearing point of the pier is filled with concrete,
A simple high-strength, high-rigidity bearing point can be constructed. In addition, in this case, when the pier is entirely filled with concrete, a high-strength and high-rigidity bearing point can be constructed, so that the vertical load on the bridge main girder is smoothly transmitted to the foundation via the concrete in the steel pipe pier. In this case, the concrete interface adhesion force at the bearing point of the steel pipe pier may be relatively small.

In order to increase the adhesive strength of the concrete interface at the bearing point, in the bridge structure of the present invention, the outer surface of the projecting portion that comes into contact with the concrete at the bearing point, and the concrete of the pier at the bearing point, A projection is provided on at least one of the inner surfaces of the reinforcing steel pipe that comes into contact with the steel pipe. As a result, the concrete adhesion between the inside of the pier steel pipe near the bearing point and the outside of the protrusion is improved, and the vertical load of the bridge main girder can be sufficiently transmitted to the pier and the foundation.

In the present invention, the bridge main girder may have a steel pipe bridge main girder structure in order to provide the bridge with a protruding portion. In the conventional hinge support structure, it was necessary to provide a horizontal flat part in order to transmit a load to the hinge, and a steel pipe bridge main girder could hardly be adopted. Also, in the case of conventional rigidly fixed bearings, the steel girder bridge main girder structure is also adopted in order to increase the difficulty of on-site work because the reinforced steel frame extends from the pier to the bridge main girder. Could not. In the present invention, the bridge girder of the bridge superstructure is a steel pipe bridge, so that the bridge superstructure itself can be constructed as a very simple, compact, high-strength, high-rigidity bearing point. Further, since the surface area of the steel pipe bridge is smaller than that of the conventional bridge structure, the painting area is reduced, and the maintenance cost can be reduced. That is,
An excellent anticorrosion structure due to the structure that can reduce the parts that are easily corroded. Furthermore, since the bridge main girder has a steel pipe bridge main girder structure, the load on the bridge itself can be reduced, and the cross-sectional forces generated in the bridge, namely, bending moment, shearing force, axial force, and torsional moment are reduced. Can be greatly increased.

In this case, the steel bridge main girder of the bridge girder can increase the wall thickness of the steel pipe itself to increase the buckling strength. In addition, the inside of the main girder of the steel pipe bridge can be filled with concrete to increase the buckling strength. When filling concrete, the main girder of the steel bridge of the bridge main girder shall be filled with ordinary concrete at least at the bearing point of the bridge and at least part of the main girder of the steel pipe bridge according to the designed cross-sectional force of the steel girder. The buckling reinforcement can be performed without providing the bearing reinforcing ribs, and the load bearing capacity can be improved. That is, high-strength ordinary concrete is filled in the vicinity of the bearing girder where the generated cross-sectional force of the main girder of the steel pipe bridge is small, and in the part where reinforcement is required to avoid steel pipe buckling due to the negative bending moment.

By filling concrete near the bearing point of the main girder of the steel pipe bridge and also entirely, it is possible to eliminate bridge noise due to running of trains and automobiles. For noise reduction, it is preferable that the concrete to be filled in the steel girder of the bridge main girder is filled with lightweight concrete to fill the entire steel girder main girder. However, in consideration of the design generated sectional force of the bridge, it is preferable to fill the vicinity of the bearing point with lightweight concrete and increase the portion not filled toward the center in the longitudinal direction of the bridge. By taking such a concrete filling structure, noise countermeasures can be rationally dealt with.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows that a pier 1 of the present invention is a reinforced concrete pier 7.
1 is a perspective view showing a bridge structure in which the bridge 2 is a steel-frame concrete bridge main girder 21 and a partial cross section. The protruding portion 3 provided on the bearing girder 4 of the steel beam 11 of the steel girder 21 is embedded in the concrete above the reinforced concrete pier 7, and the bridge girder and the pier are rigidly connected at the bearing girder 4. Fixed. FIG. 2 shows the steel beam 11 and the reinforced concrete pier 7 of the main girder 21 of the steel concrete bridge.
The following shows an example. The protruding part was welded to the bearing point of the steel beam of the main girder of the steel concrete bridge. The connection between the protrusion and the bridge main girder can be performed by welding, rivets, or the conventional connection method. The protrusion 3 provided on the steel beam 11 of the main girder 21 of the steel-frame concrete bridge was provided with a protrusion 8 for increasing the adhesive force with concrete. As is apparent from FIGS. 1 and 2, the support of the bridge pier and the bridge main girder of the present invention is a fixed type support in which the rotation and slide of the bridge main girder are completely rigidly connected. On the other hand, in the conventional support of the bridge pier 1 and the bridge main girder 2 shown in FIG. 7, a hinge 25 is provided at the bearing point 4 so that horizontal distortion is reduced and rotation and sliding of the beam are expected to some extent. It is a bearing.

When the pier 1 is a reinforced concrete pier 7 as shown in FIGS. 1 and 2, the strength of the bearing point 4 of the reinforced concrete pier may be reinforced. FIG.
The pier 1 is made of a reinforced concrete pier 7, and the outer surface near the bearing point 4 of the pier is covered with a reinforcing steel pipe 12.
2 shows a bridge structure in which a gap between the inside of the inside 2 and the outside of the protrusion 3 is filled with concrete. In the case of the present embodiment, the projections 8 and 9 are provided on both the outer surface of the projection 3 and the inner surface of the pier steel pipe 5 to improve the adhesive force of concrete. May be provided.

The protrusions 8 and 9 of the present invention can be provided with a bridge main girder in a steel concrete structure, a reinforced steel concrete structure, a steel pipe structure, or a structure equivalent thereto. In addition, the bridge pier can be applied to any of a reinforcing steel or a steel concrete structure, a steel reinforced concrete structure, a steel pipe structure, and a structure equivalent thereto as in the case of the bridge main girder. Next, an embodiment of rigidly fixing a pier and a bridge girder combining the above structures will be described.

FIGS. 4A and 4B show an embodiment in which a steel pipe bridge main girder 10 is used for the bridge main girder 2 and a steel pipe bridge pier 5 is used for the pier 1. In the bridge structure in which the pier is a steel pipe pier 5 and the concrete is filled over the entire length of the pier, the load can be smoothly transmitted from the steel girder main girder 10 to the foundation 25 (shown in FIG. 6) through the steel pipe pier 5. Further, in this embodiment, a bridge structure having high strength and rigidity of steel can be easily obtained by filling only the vicinity of the bearing point 4 of the steel pipe pier 5 with concrete. In this embodiment, a protrusion 8 provided on a main girder 10 of a steel pipe bridge and a bearing point 4 of a steel pipe pier 5 are provided.
The protrusions 9 are provided in the vicinity to improve the adhesion of the filled concrete, but the protrusions 8 and 9 can be provided on either one.

FIG. 5 shows an embodiment in which a steel pipe bridge main girder 10 is used as the bridge main girder 2 and a reinforced bridge pier 7 is used for the pier 1. By using the steel pipe bridge main girder 10 as the bridge main girder 2, it is possible to obtain a rigidly-fixed bridge structure in which the sectional force generated in the steel pipe bridge main girder 10 is greatly reduced. FIG.
(A) and (B) are cross-sectional views of a bridge structure in which a steel pipe bridge main girder 10 is used as the bridge main girder 2 of the present invention and a reinforced bridge pier 7 is used for the pier 1. Since the bridge main girder 2 is the steel girder bridge main girder 10, only the vicinity of the bearing point 4 of the steel girder bridge main girder 10 is filled with concrete, and the sectional force generated in the steel girder bridge girder 10 can be reduced. . The concrete to be filled may be either ordinary concrete or lightweight concrete. However, by filling lightweight concrete into predetermined portions of the steel pipe bridge main girder 10 in accordance with the design sectional force generated in the bridge main girder 2, vibration noise caused by a running train and an automobile can be eliminated.

[0024]

According to the present invention, a structure in which a protruding portion is provided at a bearing point portion of a pier simplifies a high-strength, high-rigidity bearing portion structure, greatly reduces on-site work, and reduces bridge structure construction costs and maintenance costs. became. In addition, the pier and the main girder of the bridge can be made of steel pipe due to the structure in which the projecting part is provided at the bearing point of the pier. Since the projecting part provided on the bridge main girder is embedded in the concrete above the pier, the bearing girder part can be easily constructed with a wide allowable construction accuracy. The adoption of a steel pipe main girder structure enabled a reduction in section force, and noise control became possible by taking into account filled concrete.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a bridge structure of a reinforced concrete pier and a steel-frame concrete bridge of the present invention, a part of which is shown in cross section.

FIG. 2 is a cross-sectional view of a bridge structure of a reinforced concrete pier and a steel concrete bridge of the present invention.

FIG. 3 is a reinforced concrete pier according to the present invention;
A sectional view of a rigidly fixed portion of a bridge structure in which only a bearing point of a pier is covered with a concrete-filled reinforced steel pipe is shown.

4A and 4B show a rigidly fixed portion of a bridge structure of a steel pipe pier and a steel pipe bridge according to the present invention, wherein FIG. 4A is a front sectional view of the rigid connection, and FIG. 4B is FIG. FIG. 3 is a cross-sectional view taken along line AA of FIG. It is sectional drawing.

FIG. 5 is a cross-sectional view of a rigidly fixed portion of a bridge structure of a steel pipe bridge main girder and a reinforced concrete pier according to the present invention.

6 is a cross-sectional view of the bridge structure of the present invention, FIG. 6A is a front cross-sectional view of the bridge structure, and FIG. 6B is a cross-sectional view taken along line BB of FIG. is there.

FIG. 7 is a cross-sectional view showing a conventional hinge supporting portion provided at a bearing point of a bridge pier and a bridge main girder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bridge pier 2 ... Bridge main girder 3 ... Projection part 4 ... Bearing point part 5 ... Steel pipe pier 7 ... Reinforcement or reinforced steel concrete pier 8 ... Projection on the outer surface of the protrusion 9 ... Projection on the inner surface of the steel pipe pier 10 ... Steel bridge main girder 11 Steel main girder of steel concrete bridge 12 Reinforced steel pipe 21 Steel frame bridge 22 Upper bridge cross girder 23 Lower bridge cross girder 24 Foundation 25 Hinge bearing

Claims (8)

[Claims] 1. A bridge structure comprising a pier (1) and a main bridge girder (2), wherein a protruding portion (3) provided at a bearing point (4) of the main bridge girder.
Embedded in concrete above the pier, and rigidly fixed to the bridge main girder and the pier. 2. The pier according to claim 1, wherein the pier is a reinforced concrete pier.
The bridge structure according to claim 1, wherein an outer surface of the bearing point portion of the pier is covered with a reinforcing steel pipe (12) and filled with concrete. 3. The bridge structure according to claim 1, wherein the entire length of the pier comprises a steel pipe pier (5), and an outer periphery of the protrusion inserted into an inner region above the steel pipe is filled with concrete and rigidly fixed. . 4. The bridge structure according to claim 1, wherein the entire length of the pier comprises a steel pipe pier (5), and the entire length of the steel pier including the upper part of the steel pipe pier is filled with concrete and rigidly fixed. 5. An outer surface of said projecting portion (3) contacting concrete at said bearing point portion and / or an inner surface of a steel pipe pier (5) contacting concrete of said pier at said bearing point portion. The bridge structure according to any one of claims 1 to 3, wherein a protrusion (8, 9) is provided on one surface. 6. The main girder of a steel-frame concrete bridge or a main girder of a steel pipe bridge.
The bridge structure according to any one of Items 1 to 4. 7. The main bridge girder of the steel pipe is a main girder of a steel pipe bridge, and concrete is applied to at least a part of the main girder of the steel pipe bridge in accordance with at least the bearing point and a sectional force generated in the main girder of the steel pipe bridge. The bridge structure according to claim 6, which is filled. 8. The bridge structure according to claim 6, wherein the concrete filled in the steel girder of the bridge main girder is lightweight concrete.