JPH1150407A - Road and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability, by laying floor slabs on a foundation beam provided horizontally or diagonally downward at every distance in the construction direction of the road on a slope, through girders. SOLUTION: Holes 6 extending horizontally or diagonally downward are bored on a slope 1 of a valley side and after a foundation beam 2 such as a wide flange-shaped steel has been inserted in the inside, a grouting material is poured therein. Then, the foundation beam works are executed at a plurality of positions separated from each other in the construction direction of the road to connect these foundation beams 2 with girders 3. And receiving frame structures 8 are installed when necessary. Then, floor slabs 4 are put on the girders 3 and paving materials 5 are put thereon. In this way, a foundation beam which is more compact than conventional piles can be obtained and a work in a mountainous area can be efficiently executed. And the construction cost, the material cost, the construction period, etc., can be reduced and further, since works on an existing road can be reduced when the width of the road is widened, the regulating period of traffic can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road suitable for construction on a steep slope such as a mountain area, and a construction method thereof.

[0002]

2. Description of the Related Art Conventionally, when a road is constructed on a slope,
The road surface was generally constructed by cutting or embankment, but recently, the slope 10 shown in Fig. 1 (a) or the same figure
A construction method has been proposed in which a vertical pile 12 is laid on an existing road 11 shown in (b), and a girder 13 and a floor slab 14 are erected on the pile 12.

[0003]

However, in the conventional construction method shown in FIG. 1, since a long and heavy pile is used, it is difficult to carry the pile and its heavy construction equipment. Was impossible. FIG.
As shown in (b), when a new road is extended from an existing road, piles are driven into the existing road, excavation is performed, and a girder is erected. .

Accordingly, an object of the present invention is to propose a road structure which can be constructed even in a place where it is difficult to carry a long object such as a pile and heavy construction equipment, and an advantageous construction method thereof.

[0005]

According to the present invention, a floor slab is mounted on a plurality of foundation beams which are installed horizontally or diagonally downward at a plurality of points separated from each other in a road laying direction on a slope. It is a road that is placed.

[0006] In addition, the above road is provided with a horizontal or diagonally downward drilled hole on a slope, a foundation beam inserted into the hole, and a grout material filled in the hole to fix the foundation beam to the slope. A road construction method characterized in that the method is performed at a plurality of points separated in the direction of laying a road, and thereafter, a plurality of foundation beams installed are connected with a girder and a slab is erected on the girder.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a road according to the present invention will be described in detail with reference to the drawings. First, in the road shown in FIG. 2, a plurality of horizontally extending foundation beams 2 installed at a plurality of points separated in the road laying direction on the slope 1 are joined by a girder 3 extending in the road laying direction. The floor slab 4 is placed on the floor slab 4 and a pavement 5 is formed on the floor slab 4.

That is, the foundation beam 2 is inserted into the hole 6 excavated in the horizontal direction with respect to the slope 1, with a root portion 2 a having a length slightly more than half of that.
And grouting material 7 is injected into the hole 6 so that the foundation beam 2
The grout material 7 is filled in the gap between the hole 6 and the peripheral surface of the hole 6, and is fixed to the slope 1. On the other hand, the projecting portion 2b, which extends horizontally from the slope 1 to the valley side and is slightly less than half the length of the foundation beam 2, is provided with a receiving frame 8 for adjusting the positions of the girder 3 and the number of floors 4, Girder 3 between foundation beams 2 adjacent to the direction of road construction
Overcast. In the illustrated example, two rows of girders 3 are provided at intervals in the extending direction of the foundation beam 2. And these digits 3
The floor slab 4 is placed in between, and the pavement 5 is provided on the floor slab 4. Incidentally, for the floor slab 4, it is preferable to use a grating slab in which a reinforcing bar is formed in advance on a steel plate, and it is preferable that the foundation beam is made of a weather-resistant steel plate.
It is preferable in terms of durability.

Here, when the foundation beam 2 extending in the horizontal direction is installed on a slope, the own weight, the overburden load, the seismic force, etc., which are applied to the road, are perpendicular to the overhang portion 2b of the foundation beam 2 via the girder 3. Acts as a horizontal and bending moment. As a resistance to this, a reaction force received from the ground inside the slope of the foundation beam 2 can be expected. In response to these external loads, the indentation resistance of the root 2a of the foundation beam 2 in the ground, the peripheral friction force,
The required length of the root 2a can be calculated by using the ground reaction force acting in the direction perpendicular to the beam axis.
For example, in order to obtain an overhang of about 3 m in a foundation beam extending in the horizontal direction, it is only necessary to pierce the slope by 3 to 4 m.

In the road shown in FIG. 3, a foundation beam 2 is installed obliquely downward on a slope 1, and is fixed vertically on the foundation beam 2 and further near the slope 1 of a projecting portion 2b of the foundation beam 2. The girder 3 is fixed on the receiving frame 9, and the girder 3 connects the foundation beams 2 and the receiving frame 9 adjacent to each other in the road laying direction.

When the foundation beam 2 is installed obliquely downward, the inclination angle α of the axis L with respect to the vertical line O is 15 °.
It is preferable to make the above. This is because if α is less than 15 °, the distance between the foundation beam 2 and the surface of the slope 1 is reduced, and the ground resistance of the slope 1 against the load applied to the foundation beam 2 is reduced. This is because the depth 2a of the foundation beam 2 becomes extremely long, and the advantage of the present method is lost. The upper limit of the inclination angle α is 90 in the horizontal direction.
°. Further, the length of the root 2a of the foundation beam 2 in the ground can be calculated in the same manner as in the case of FIG.

Next, regarding the above-described road construction method,
Details will be described. First, a hole 6 extending horizontally or obliquely downward for installing the foundation beam 2 is excavated on the slope 1 on the valley side, and the foundation beam 2 such as an H-section steel, a square steel pipe or a steel pipe is formed in the hole 6. After that, the grout material 7 is poured into the hole 6 to complete the placement of the foundation beam 2. In drilling the hole 6, a hole covering the cross section of the foundation beam 2 can be drilled by down-the-hole drilling, large-diameter core boring, excavation combined with blasting, and the like. It is also possible to continuously drill a plurality of holes using a small-diameter boring machine or the like to the extent that it can be inserted.

After the construction of the foundation beams is performed at a plurality of points separated in the direction of laying the road, the plurality of foundation beams 2 installed are connected via receiving frames 8 and 9 as necessary.
After joining with the spar 3, the above-mentioned grating slab 4 is preferably placed on the slab 3, and then the pavement 5 is applied on the slab 4 to complete the road.

FIGS. 2 and 3 show an example in which a new road is constructed. The road structure and the construction method of the present invention are also advantageously applied to a case where a road is widened to the valley side of an existing road. Of course.

[0015]

According to the present invention, since the road is supported by horizontal or oblique beams, a compact foundation beam can be used as compared with a conventional pile, so that transportation and handling are facilitated, and mountainous areas can be used. Construction can be carried out efficiently, and the construction period can be shortened and construction costs can be reduced. Moreover, since the length of the foundation beam is shorter and the weight of the steel material is smaller than that of the pile, construction costs and material costs can be reduced. Further, when the present invention is applied when widening an existing road, the work performed on the existing road during the construction can be reduced, and the period during which traffic regulation is required can be shortened.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a conventional artificial ground road structure.

FIG. 2 is a schematic diagram showing a road structure according to the present invention.

FIG. 3 is a schematic diagram showing another road structure according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 slope 2 foundation beam 3 girder 4 floor slab 5 pavement 6 hole 7 grout material 8 receiving frame 9 receiving frame

Claims (2)

[Claims] 1. A road in which a slab is placed via a girder on a plurality of foundation beams, which are installed horizontally or obliquely downward at a plurality of points separated in a road laying direction on a slope. 2. A method of making a horizontal or diagonally downward hole in a slope, inserting a foundation beam into the hole, filling the hole with grout material and fixing the foundation beam to the slope, in a road laying direction. A method for constructing a road, comprising performing at a plurality of separated points, connecting a plurality of foundation beams installed thereafter with a girder, and laying a floor slab on the girder.