JPH0730527B2 - Bridge and its construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge, and more particularly to a bridge having high strength and easy to construct, and a construction method thereof.

[0002]

2. Description of the Related Art The technique of making the structure of a bridge arch-shaped is mechanically rational and has been adopted since ancient times. That is, the structure that supports the bridge girder is an arch type that extends in an arc shape from one shore to the opposite shore.

[0003]

In such a conventional bridge, steel structures are gradually assembled from one shore to the opposite shore or from both shores to form an arched steel structure,
Arches were constructed by assembling the formwork according to the construction site each time. Therefore, it is necessary to perform construction work such as assembling separate molds depending on the construction portion, and the construction is extremely complicated and requires a long construction period.

The present invention has been made in order to solve the above problems, and is constructed as a structure by forming an arch-shaped cross section over the entire length of the bridge that is easy to construct and is mechanically rational. Also aims to provide a bridge and its construction method that are not inferior to conventional bridges.

[0005]

A bridge according to the present invention has a base portion having an arcuate cross section in the width direction. That is, the base has an arch structure that supports the bridge girder from the left and right in the width direction. On the upper part of this base part, a running road that extends laterally in the width direction is formed, and the base part and the running road form a bridge girder. The piers stand up from the left and right in the width direction so as to be located on the extension line of the arcuate base and support the bridge girder. The base of the bridge girder and the pier should form an arched structure.

Since the bridge constructed according to the present invention has an arched structure, it has the same structural strength as the conventional one. In addition, since the base has the same cross-sectional shape over the entire length of the bridge girder, the same formwork can be used for the entire length, and construction can be significantly simplified.

A sub-runway located under the runway of the base may be extended from the left and right in the width direction of the base. Further, opening holes penetrating in the width direction may be formed at appropriate intervals in the traveling direction of the bridge girder on the side surface of the base portion below the traveling path. By forming the opening holes, it is possible to reduce the amount of material used and also reduce the weight of the entire bridge girder.

A formwork having an arcuate cross section in the width direction is supported at a predetermined height so that the formwork can run on a rail extending in the traveling direction of the bridge girder. The form is moved while running on this rail, and concrete is placed on the form to form the base of the bridge girder having an arc-shaped cross section. By running the same formwork, the entire length of the bridge girder can be constructed, which can significantly simplify the construction and shorten the construction.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on an embodiment shown in the drawings. In the figure, 1 is a mold, and the widthwise intermediate portion 2 has an arcuate cross section. On the left and right sides of this intermediate portion 2, sub-running path forming portions 3 and 3 project. This formwork 1 is supported by temporary support columns 4. Temporary support pillar 4
-Wheels 5 and 5 are attached to the lower end of 4 and are placed on rails 6 and 6 laid along the direction of travel of the bridge girder. With the above configuration, the formwork 1 can be moved in the traveling direction of the bridge girder.

Concrete 7 is poured while moving the form 1 to form a base 8 having an arcuate cross section in the width direction. Sub-running paths 9 and 9 are formed integrally with the base 8 at the left and right ends in the width direction of the base 8. In addition, a traveling path 10 is formed on the upper portion of the base portion 8 so as to project to the left and right in the width direction. Therefore, bridge girders in which the running path 10 and the sub-running path 9 project in two steps vertically are formed on the left and right sides of the base portion 8 in the width direction.

Below the running path 10 and above the sub-running path 9, an opening hole 11 is formed in the side surface of the base so as to extend horizontally in the width direction. The opening holes 11 are formed at appropriate intervals in the traveling direction of the bridge girder. This opening hole 11
It is also possible to use it as an observation window by fitting the glass 12 to the.

It is supported by the piers 13 at appropriate intervals in the traveling direction of the bridge girder. The base 8 of the bridge girder has an arcuate cross section, and the pier 13 stands up from the ground so as to be located on an extension of the arcuate base 8. The bridge girders are supported by the bridge piers 13 and 13 standing from the left and right in the width direction of the bridge girder, and the base 8 of the bridge girder and the bridge piers 13 and 13 form an arched structure. Therefore, since the bridge according to the present invention has the arch structure, it has the same structural strength as the conventional bridge.

In the above-mentioned embodiments, the construction in which the entire length is constructed by the movable formwork is adopted. However, when large spans are mixed, a part of the normal construction work is used instead of the movement support work. It can also be installed in combination.

[0014]

EFFECTS OF THE INVENTION The present invention has the structure as described above, and since the arch-shaped structure is constituted by the base having an arcuate cross section in the width direction and the bridge pier located on this extension line, the structural strength is the same as the conventional structure. Can be obtained. Since the cross-sectional shape is the same over the entire length of the bridge girder, the same formwork can be used for the entire length, so that the construction can be simplified and the construction period can be shortened.
By forming an opening in the side surface of the base of the bridge girder, the amount of material can be reduced and the weight of the bridge girder can be reduced. The entire length of the bridge girder can be easily constructed by moving the formwork having an arcuate cross section while moving the rail.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a bridge according to the present invention.

FIG. 2 is a sectional view in the width direction.

FIG. 3 is a side view thereof.

[Explanation of symbols]

 1 Formwork 2 Middle part 6 Rail 7 Concrete 8 Base 9 Sub-runway 10 Runway 11 Opening hole 13 Pier

Claims (4)

[Claims] 1. A bridge girder is formed by forming a running path extending laterally in the width direction on the upper part of a base portion having an arcuate cross section in the width direction, and a bridge pier supporting the bridge girder is positioned on an extension line of the arcuate base portion. A bridge that stands up from the left and right in the width direction, and is constructed so as to form an arched structure with the bases of bridge girders and bridge piers. 2. The bridge according to claim 1, wherein a sub-runway located below the runway of the base extends from the left and right in the width direction of the base. 3. The bridge according to claim 1, wherein opening holes penetrating in the width direction are formed at appropriate intervals in the traveling direction of the bridge girder on the side surface of the base portion below the traveling path. 4. A formwork having an arcuate cross section in the width direction is supported at a predetermined height so that the formwork can run on a rail extending in the traveling direction of the bridge girder, and the formwork is moved while running on the rail. A construction method for a bridge in which concrete is cast on a formwork to form the base of a bridge girder with an arcuate cross section.