JP2001049617A - Elevated bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevated bridge for crossing a road, a river, or the like, which enables to view excellent landscapes, dispenses with support of a girder, and can be constructed economically and in a short period of time. SOLUTION: The elevated bridge which crosses a road, a river, or the like, is of a rigid-frame structure formed of three sequential spans connected together in one body, i.e., one span 6 having a long span length, and two spans 5, 7 each having short span length and being constructed in the front and rear of the one span 6. Further, a foundation of an edge column 10 of the elevated bridge and a foundation of an edge column 11 of each of adjacent elevated bridges 1, 3, are integrally constructed. Then, the columns are coordinated with each other so as to have the same thickness, and edges of arched constructions of longitudinal beams of the respective spans are coordinated with each other so as to have the same height.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viaduct structure at a place crossing a road, a river or the like.

[0002]

2. Description of the Related Art Conventionally, viaducts that cross roads, rivers and the like are mainly made of simple girder, and a simple girder and an abutment for supporting this girder at both ends or a girder provided at an end portion are provided. It was constituted by a structure such as a formula viaduct. For example, as shown in an axis diagram in FIG. 4, a simple girder 34 crossing the road 1 is connected to the girder supports 3 of the right and left ramen abutments 32.
Support with 3. The ramen abutment is a structure that supports the girder with four pillars. The ramen abutment 32 and the ramen-type viaduct 3
8, a Gerber girder 36 having a narrow span with girder supports 35 and 37 so that the settlement of one structure does not affect the other.
And a structure is used in which structures are separated and connected by girders. Further, when the width of the road 31 is narrow, as shown in FIG. 5, a structure in which the simple girder 34 is directly supported by the girder receiver 37 of the ramen type viaduct 38 is also used.

[0003]

In the case of a viaduct structure for supporting a girder as described above, for example, as shown in FIG. 6, a girder support of a column 32a of a ramen abutment 32 for supporting a simple girder 34 crossing a road or the like. 33 becomes unnecessarily large for the purpose of preventing a bridge from being dropped due to an earthquake or the like, and the column 32a supporting the column receives an inertial force in the direction perpendicular to the bridge axis (horizontal direction) applied to the entire weight of the girder during an earthquake. Other pillars 32
It becomes thicker than b etc. In addition, ramen abutment 3
The vertical beam of No. 2 puts the hatch beam 32c and the wall 32d between them
Is installed and a simple girder 34 (girder height H3) is set as the girder height H2.
And ramen abutment 32
Since the span of the gel bar girder 36 supported by the column 32b is narrow, the girder height H1 is small. Therefore, when viewed from the side of the girder, steps such as a small girder height H1, a large girder height H2, and an intermediate girder height H3 can be seen, and there is a problem with the viewability.

Further, as a construction procedure, first, structures such as a ramen-type viaduct for supporting the girder, a ramen abutment, and the like are constructed in advance, and after these structures are completed, fabrication of the girder is started. In addition, when constructing the girder, it takes time and effort to transport the material to a place where many pillars are standing, which eventually required a long time for the construction. In addition, since the support member 39 (rubber shoe or metal member) provided between the simple girder 34 and the column 32a of the ramen abutment 32 for transmitting the force is displaced or deformed, the inspection cost is increased. It often required maintenance and was uneconomical.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an advantage in that an overpass that crosses a road, a river, or the like has excellent scenic properties, does not require a girder support, and can be constructed economically and in a short time. Aim.

[0006]

According to the present invention, in a viaduct crossing a road or a river, one span having a long span and two spans having a short span before and after the span are integrated. Is characterized by having a continuous ramen structure of three spans. Further, the present invention is characterized in that a foundation supporting the short span end pillars of the three span continuous rigid frame structure and a foundation supporting the end pillars of the adjacent viaducts are integrally formed. Further, the present invention is characterized in that the pillars at both ends of the long span of the three span continuous rigid frame structure are a plurality of pillars.
Further, the present invention is characterized in that the thickness of the column of the three-span continuous ramen structure is made equal to the thickness of the column of the adjacent viaduct structure. Further, the present invention is characterized in that the three-span continuous ramen structure and the vertical beams of the adjacent viaducts have an arch structure, and the heights of the arch ends of the respective spans are uniform.

[0007]

Embodiments of the present invention will be described below. FIG. 1 is a diagram showing an example of a viaduct having a continuous ramen structure of three spans at a location crossing a road, a river, or the like. In FIG. 1, span 6 is a span crossing a road, a river, or the like, and is integrally formed with span 5 and span 7 to form a three-span continuous ramen structure 2. The structure 1 and the structure 3 are high bridges of the general part adjacent to the high bridge. In the present invention, since the ramen structure has a three-span continuous structure, unlike a girder structure, a bearing structure is not required, and there is no need to construct in a stepwise manner, so that the construction period can be shortened.

The vertical beams of the structure 1, the structure 2, and the structure 3 have an arch structure, and the ends of the arch are aligned on both sides to enhance the landscape. This can be realized by using a ramen structure having a three-span integrated structure. In a conventional ramen-type structure for receiving a girder, the height cannot be made uniform when an arch structure is used.

In a viaduct having a three-span continuous ramen structure, the middle span 6 is usually longer than the spans 5 and 7 at both ends because the span spans a road or a river. And the weight of the train load, for example, becomes larger than the weight acting on the span 5, and the pillars 9 on both sides of the span 6 are used as fulcrums according to the principle of leverage, and the outer pillars 10 of the span 5 and span 7 are used.
Is generated, that is, an uplift is generated.
The column 10 and the columns 11 of the adjacent viaducts 1 and 3 are supported by one foundation 12 so that this force does not adversely affect the foundation. With such a configuration, the weight of the structures 1 and 3 is applied to the foundation 12 through the columns 11, and the uplift of the columns 10 can be eliminated. In addition, the uplift of the pillar 10 can also be eliminated by making the span 5 and span 8 longer, but if it is so, it will be longer than the span of the viaduct of the adjacent general part, which is not preferable in view of the landscape. Therefore, in the present invention, by using a structure in which the pillar at the end portion of the viaduct of the three span continuous rigid frame structure and the pillar of the adjacent viaduct structure are supported by one foundation, the span 5 and span 7 are adjacent viaducts. It is equal to span 4 and span 8 so that the viewability is not impaired.

In addition, since the viaduct of FIG. 1 is an integral structure by adopting a three-span continuous rigid frame structure, the load applied to each column can be made uniform, and therefore, the thickness of the columns can be made the same. It is possible, and also in this respect, the landscape can be enhanced.

FIG. 2 is a view showing another example of a viaduct having a continuous ramen structure of three spans at a location crossing a road, a river, or the like. The basic configuration is the same as the example of FIG.
The difference is that the span 18 of the span continuous frame structure is longer, two columns on both sides of the span 18 are provided, and the columns are joined to the pile foundation.

The span 18 is a span that crosses a road, a river, or the like.
The ramen structure 14 has a continuous span. Structure 1
3. The structure 15 is a high bridge of a general part adjacent to the high bridge. The vertical beam of the structures 13, 14, and 15 is an arch structure. As in the case of FIG. 1, the vertical beam of the structure is an arch structure, and each end of the arch has a height on both sides. All together to enhance the landscape.

Also, the center span 18 is the span 17 at both ends,
Since the length is longer than 19, an uplift is generated in the columns 23 outside the span 17 and the span 19, and in order to eliminate the uplift, the columns 23 and the columns 24 of the adjacent viaduct structures 13 and 15, as in the case of FIG.
Is supported by one pile foundation 25. With this configuration, the span 17 and span 19 are equal to the span 16 and span 20 of the adjacent viaduct, so that the viewability is not impaired. .

Further, in this example, the columns on both sides of the long span 18 are made into a plurality (two in this example) of columns 21 and 22 of the same thickness as the columns of the adjacent viaduct, and the columns are reduced in diameter. ing.
This is not a structure that receives a girder, but an integrated structure of a three-span continuous rigid frame structure, which makes it possible to equalize the load applied to each column, making it possible to enhance the landscape also in this regard. it can. In general, the required cross section and number of columns are determined by the inertial force at the time of the earthquake, but in the present invention, the number of columns that share the inertial force at the time of the earthquake acting on the structure,
At the same time the thickness of the columns is adjustable.

FIG. 3 is a view for explaining the configuration of a portion for supporting the columns of the three span continuous rigid frame structure and the adjacent viaduct structure on one foundation. The pillar 10 or 23 at the end of the three-span continuous rigid frame structure in FIGS. 1 and 2 and the pillar 11 or 24 of the adjacent viaduct structure are supported by one foundation 12 or 25, and the number between the pillars at the top is several. The distance of mm is wide. Since a track is constructed on the top of the pillar, water-retaining concretes 26 and 27 are attached to both pillars, and an iron plate 28 is passed between the two and fixed to one of the water-retaining concrete with bolts.

[0016]

As described above, according to the present invention, at a place where a viaduct crosses a road or a river, a continuous integrated elevated structure is used without using a girder with a bearing structure. By using a small cross-sectional area, that is, a thin pillar, the thickness can be made uniform with the adjacent viaduct, and the landscape can be enhanced. The height of each end of the vertical arch of the arch structure can be aligned on both sides to enhance the landscape. Since the support structure is not required, the maintenance is not required, and the maintenance and management can be performed economically in terms of maintenance costs and repair costs. Compared with the girder structure, it is not necessary to perform the construction step by step, so that the construction period can be shortened.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a highly crosslinked three-span continuous rigid frame structure.

FIG. 2 is a view showing another example of a viaduct having a rigid frame structure of three spans continuous.

FIG. 3 is a diagram illustrating a configuration of a portion that supports columns of a three span continuous rigid frame structure and an adjacent viaduct structure on one foundation.

FIG. 4 is a diagram showing an example of a conventional viaduct shown in an axial view.

FIG. 5 is a diagram showing an example of a conventional viaduct shown in an axial view.

FIG. 6 is a view for explaining a problem of a conventional viaduct.

[Explanation of symbols]

1,3,13,15 ... adjacent viaduct structure, 2,14 ... 3
Span continuous frame structure, 4-8, 16-20 ... span,
9-11, 21-24 ... pillar, 12 ... foundation (footing), 25 ... pile foundation.

Claims (5)

[Claims] In a viaduct crossing a road or a river, a three-span continuous ramen structure is formed by integrating one span with a long span and two spans with a short span before and after the span. Highly crosslinked, characterized in that: 2. A base for supporting end columns of short spans of the three-span continuous rigid frame structure, and a foundation for supporting end columns of adjacent viaducts, which are integrally formed. 1. The highly crosslinked product according to 1. 3. The viaduct according to claim 1, wherein the pillars at both ends of the long span of the three span continuous rigid frame structure are a plurality of pillars. 4. The viaduct according to any one of claims 1 to 3, wherein the pillars of the three-span continuous rigid frame structure have the same thickness as the pillars of the adjacent viaduct structure. . 5. The three-span continuous ramen structure and an adjacent viaduct having a vertical beam as an arch structure, wherein the heights of arch ends of the respective spans are uniform. The highly crosslinked product according to any one of the above.