JP2000204505A - Widened road and its execution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road, which is executed comparatively simply and which has high strength. SOLUTION: The road, in which the road width of an existing road built on the slope of a mountainous section or the like is widened towards the valley side, is composed of a plurality of concrete foundations arranged to the valley- side end section of the existing road at intervals along the existing road and at least one foundation piles driven in response to the quantity of widening at every concrete foundation. The road is constituted of transverse panel point girders connecting mutual concrete foundations and foundation piles among these foundations and piles, longitudinal panel point girders stretched to each of the mutually adjacent concrete foundations and foundation piles and a floor slab installed onto the transverse and longitudinal panel point girders.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is intended to reduce the width of an existing road constructed on an inclined surface such as a mountainous area without performing a large amount of excavation, backfilling and other earth work and concrete work, and is relatively short. The present invention relates to a widened road in the field of civil engineering that can be constructed in a construction period, and a method of constructing the widened road.

[0002]

2. Description of the Related Art Conventionally, when widening a narrow road provided on an inclined surface such as a mountain area, a slope on the valley side of the road is excavated as shown in FIG. After constructing retaining wall concrete c in order to make the ground support the road whose width is widened, the excavated area is backfilled, and the area from the valley side end of the existing road d to the retaining wall c is filled with earth and sand. A construction method has been adopted in which the floor slab e is returned, and then a road is formed in accordance with a normal process.

[0003] The above-mentioned conventional construction method has the following disadvantages.

[0004] 1) When constructing the retaining wall, it is necessary to excavate to the supporting ground, so that a large amount of earth and sand is generated, so it is necessary to secure a space for transporting and temporarily placing the soil. Not suitable. 2) The ground in mountainous areas is often rock bed, and when excavation work is performed over a wide area, not only construction costs increase but also the construction period becomes longer. 3) After the construction of the retaining wall, a large amount of earth and sand is required for backfilling, and as in 1) and 2) above, transportation of earth and sand, securing of temporary storage space, an increase in construction costs, and a longer construction period are required. There are inconveniences. 4) The earth and sand used for backfilling will be quite heavy, and there is a risk that the retaining wall will collapse due to the backfilled earth and sand, especially when an earthquake occurs. 5) The widened portion of the road is made of backfilled earth and sand, so that the road is likely to sink, and frequent rutting is required, so frequent maintenance of the road is required.

[0005] In this regard, Japanese Patent Publication No. 2-37441 discloses that a supporting pile and a reaction force anchor are installed at a predetermined interval on the widening side of an existing road, and the floor and the girder are substantially T-shaped in cross section. An overhang widening road construction method has been proposed in which the overhanging girder material is integrated from the existing road.
According to this, compared with the above-mentioned conventional construction method, earth and sand for backfilling is unnecessary, and it is said that road construction is easy.

[0006] However, in the overhang widening road construction method, 1) The load applied to the overhang portion is supported by a reaction force anchor using a support frame cast at the valley side of the existing road as a fulcrum. In order to maintain the function of the reaction force anchor, it is necessary to perform regular maintenance to tighten the nut of the anchor because the nut is loosened. 2) Since the cantilever is supported against the load applied to the overhang portion, a high-strength cross beam is required in order to prevent bending of the widened portion of the road. 3) Since there is no resistance to the horizontal load of the reaction force anchor, the force applied in the horizontal direction of the road due to an earthquake or the like must be supported by the support frame. Therefore, the support frame is extremely strong in consideration of the strength of the road. There was a new problem that had to be done.

An object of the present invention is to solve the above-mentioned problems caused by the conventional construction method and to propose a new widened road which can be constructed in a relatively short time and a construction method thereof.

[0008]

SUMMARY OF THE INVENTION The present invention is a road in which the width of an existing road constructed on an inclined surface such as a mountain area is widened toward the valley, and the road is widened on the valley side of the existing road. At the end, a plurality of concrete foundations arranged along the existing road, and a foundation pile driven at a widening target point for each concrete foundation are provided, and these are connected between the concrete foundation and the foundation pile. While the horizontal girder is provided, each of the adjacent concrete foundation and foundation pile is provided with a vertical girder spanning between them, and the floor slab is placed on the horizontal girder and the vertical girder. Is a widened road characterized by the installation of
In the present invention, a concrete foundation having earth retaining concrete on which a vertical girder is placed is suitable.

In addition, the present invention provides a method of widening a road width of an existing road constructed on an inclined surface such as a mountain section toward a valley side, by providing a concrete foundation along the existing road at the valley side end of the existing road. And set the target points according to the widening for each concrete foundation, and drive the foundation pile,
After that, cross beams are placed between the concrete foundation and the foundation pile, while the concrete foundation and the foundation pile adjacent to each other are laid with vertical girder girder, and then the floor covering them on each girder. This is a widening road construction method characterized by installing a plate.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a foundation pile is cast at a target point for widening, a concrete foundation is placed at an end of a valley side of an existing road, and a horizontal girder and a vertical girder are provided here. Since the floor slabs are placed on the girders, there is no need to construct retaining walls. A concrete foundation is provided at the valley side end of the existing road, but since this concrete foundation is mainly subjected to vertical loads, it is relatively small and requires little earth and sand due to excavation to install it. Yes.

Further, the widened road of the present invention is reduced in weight as compared with a conventional widened road in which a retaining wall is constructed, since its constituent members are a foundation pile, a small-scale concrete foundation, vertical and horizontal beams, and a floor slab. Can be achieved. In the widened road according to the present invention, a plurality of foundation piles can be driven as necessary in either the width direction and / or the longitudinal direction of the road.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically with reference to the drawings. FIGS. 2 and 3 show cross sections of the widened road according to the present invention, respectively, with the arrangement points of the horizontal girder and the vertical girder girder, and the left side of each figure is referred to as a valley side. 2 and 3, 1 is an existing road, 2 is a concrete foundation arranged along the road at an end of the existing road 1 at a valley side, and 3 is a foundation cast according to the widening amount for each concrete foundation. Pile (steel pipe pile, etc.), 4 is a horizontal girder connecting between concrete foundation 2 and foundation pile 3
Is a vertical girder spanning each of the concrete foundation 2 and the foundation pile 3 adjacent to each other, and a floor plate 6 made of reinforced concrete or the like is placed on the vertical girder 5 and the horizontal girder 4. The asphalt pavement “a” and the like are further provided along with the existing road portion.

Concrete foundation 2 for widening road 2
In the present invention, the lands are arranged along the existing road 1 at the valley-side end thereof, so that they are in contact with the lower flange of the vertical girder 5 as shown in FIG. By arranging the concrete 7, it plays a role of earth retaining together.

As a construction procedure for widening an existing road, first, a foundation pile is driven into an inclined surface, and a valley-side end of the existing road 1 is excavated to such an extent that a concrete foundation 2 can be installed. Concrete foundation 2 and earth retaining concrete 7
After the construction of the concrete foundation 2 and the foundation pile 3, the horizontal scale girder 4 and the adjacent concrete foundation 2
The vertical scale girders 5 are inserted into each of the base piles 3 and firmly connected with high-strength bolts or the like, and then a floor slab is installed thereon.

When the same scale was tried for the case where the existing road was widened by constructing the retaining wall as shown in FIG. 1 above and the case where the widening was performed according to the present invention, as shown in Table 1, Results were obtained.

[0016]

[Table 1]

In the comparative example, a large amount of concrete was required to form a concrete retaining wall along the existing road valley side. However, in the adaptation example, a concrete foundation arranged at an interval and earth retaining concrete installed between them were used. Because of this, the amount of concrete used was 1/7. Also, in the comparative example, the amount of excavated soil was large in order to excavate the valley side inclined surface significantly in order to form this retaining wall.
Since only the concrete foundation and earth retaining concrete at the end of the existing road valley were excavated, the amount of excavated soil could be reduced to 1/10 or less, and the construction period was significantly reduced.

[0018]

According to the present invention, the amount of excavation carried out when widening an existing road is a minimum required for installing a concrete foundation, so that very little earth and sand is carried out. Further, since it is not necessary to construct a retaining wall, the amount of concrete used is small, and there is almost no curing, so that the construction period can be remarkably reduced. The widened part of the road is lighter in weight than a road with a retaining wall, so the seismic force is smaller and the seismic resistance can be improved. In particular, it was impossible to carry out construction work in places where the ground is likely to slip because the conventional construction method would increase the sliding moment.However, in the present invention, the load is supported by placing the foundation pile on a solid support layer. It can be applied to a sliding layer.

Further, in the present invention, since the basic components of the widened portion are composed of a girder, a stake, and a floor plate, the road surface does not sink and rutting does not occur, and road maintenance is unnecessary. Particularly when widening a road in a mountain area or the like, there is an advantage that the natural environment, flora and fauna, or landscape can be preserved as it is because the topography is not largely changed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross section of a widened road constructed according to a conventional construction method.

FIG. 2 is a view showing a configuration of a lateral girder and a foundation pile of a widened road constructed by a construction method according to the present invention.

FIG. 3 is a view showing a vertical girder of a widened road constructed by the construction method according to the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing road 2 Concrete foundation 3 Foundation pile 4 Horizontal scale girder 5 Vertical scale girder 6 Floor slab 7 Soil concrete a Asphalt pavement c Retaining wall d Existing road e Floor slab

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keisuke Shioda 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo F-term in Kawasaki Steel Corporation (reference) 2D051 AC08 AF03 AG01 BA01 BA02 BA03 BA07

Claims (3)

[Claims] 1. A road in which the width of an existing road constructed on an inclined surface such as a mountain area is widened toward the valley side, and is provided at an end along the valley side of the existing road along the existing road. A plurality of concrete foundations arranged and at least one foundation pile installed on an existing road valley-side slope according to the amount of widening for each concrete foundation. A vertical girder connecting each of the concrete foundations and foundation piles adjacent to each other, and a floor slab installed on the horizontal girder and the vertical girder. Widening road characterized by: 2. The widened road according to claim 1, further comprising earth retaining concrete on which the vertical girder is placed between the concrete foundations. 3. When widening the road width of an existing road constructed on an inclined surface such as a mountain area toward a valley side, a concrete foundation is installed along the existing road at the valley side end of the existing road. And placing at least one foundation pile corresponding to the widening for each concrete foundation, and then placing a horizontal girder between the concrete foundation and the foundation pile while simultaneously placing the concrete foundation and the foundation pile adjacent to each other. A method of constructing a widened road, characterized in that vertical girder bridges are passed over each girder, and then a floor slab is placed over each girder bridge.