JPH0721169B2 - Cantilever shed - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cantilever type shed for protecting rocks and avalanches on a road below a slope.

[0002]

2. Description of the Related Art Conventionally, rock sheds for rockfall protection and snow sheds for avalanche protection attached to roads in mountainous areas include cast-in-place reinforced concrete structures, steel structures and prestressed concrete structures. It was common to build foundations on the valley side and mountain side of the road, set up pillars and walls on it, and fix linings such as beams and floors on them.

[0003]

In such conventional rock sheds and snow sheds, it is often impossible to construct piles, foundations and columns in the Tanigawa in the case of steep terrain. There are many cases where sheds cannot be installed and road safety remains unsecured.

In view of such conventional problems, an object of the present invention is to provide a cantilever type shed which can be constructed only on the mountain side without requiring the construction of a foundation or the like on the road valley side and which is highly stable. It is what

[0005]

The feature of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is that a concrete ground is installed underground along the mountain side of a road. A foundation concrete board integrally provided on the middle pile, front and rear wall pillars erected in two rows along the road on the foundation concrete board, and both wall pillars supporting one side. A cantilever type lining overhanging the road,
Gravel-enhancing earth and sand are packed between the both wall pillars, and the lining is formed by arranging rectangular precast members and inserting PC steel materials continuously in the respective lateral directions and tensioning them to integrate them. Residing in a cantilevered shed

[0006]

In the cantilevered shed of the present invention, when the cantilevered shed is constructed, the pile and the foundation concrete board are constructed only on the mountain side of the road, so that the construction can be done without completely closing the road. The constructed shed is centered on the front side of the wall pillars in two rows, that is, the top of the wall pillar on the road side, and the projecting tip side of the lining acts with a downward rotation moment, and the mountain side end of the lining An upward tensile load is applied to the rear wall column to which is fixed. In addition, as a whole, a rotating moment acts in the direction in which the wall column falls down to the road side around the front edge of the foundation concrete slab, but the load in the tensile direction on the pile, the vertical component force of gravity applied to the wall column, and both This is countered by the gravity of the sediment between the wall columns.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

In the figure, 1 is a road surface, 2 is a valley side slope, and 3 is a mountain side slope. The entire upper surface of the road surface 1 is covered with the shed according to the present invention. When constructing this shed, first, underground piles 5a and 5b are buried in two rows along the mountain side of the road surface 1. The underground piles 5a and 5b may be installed by driving precast PC (prestressed concrete) piles into the ground, or may be on-site piles.

Then, the foundation concrete board 6 is integrated with the upper ends of the underground piles 5a and 5b by using in-situ concrete. This foundation concrete board 6 is installed on site in parallel with the edge of the road surface 1 with a certain width. Wall pillars 7a and 7b are erected on the upper surface of the foundation concrete board 6 in front and rear two-row arrangement with cast-in-place concrete. Both the wall pillars 7a and 7b are formed in a continuous wall shape, a space 8 is provided in the middle of the both, and the upper edge portions are connected by a horizontal beam 9. Further, when constructing the wall columns 7a, 7b, the PC steel materials 10a, 10b are vertically embedded and the upper ends thereof are projected onto the wall columns 7a, 7b.

After the wall pillars 7a and 7b are constructed in this way,
In the space 8 between the pillars of both walls, the earth and sand excavated before the construction of the foundation concrete board 6 is buried to increase the total weight. Next, the lining 10 which is a superstructure is constructed. The lining 10 arranges a large number of rectangular precast PC plates 11, 11 ... in order in the width direction, one end side of which is supported on both wall columns 7a, 7b, and PC steel materials 12a, 12b are penetrated to make tension. Then
The fixing tool 13 fixes the toner on the upper surface of each PC board 11 to support it.

The PC board 11 has a longitudinal beam portion 14 integrally formed in the center of the lower surface side in the longitudinal direction, and a transverse beam portion 15 over the entire width in the width direction integrally formed.
A PC steel material 16 is embedded in the inside in the longitudinal direction to give a prestress, and a PC steel material is provided in the lateral beam portion 15.
A steel material insertion hole 17 is used which is open at both left and right ends.

The PC plates 11 are sequentially installed side by side while inserting the PC steel materials 18 for lateral fastening through the respective PC steel material insertion holes 17, and laterally fastened by a predetermined number of sheets as shown in FIG. The PC plates 11, 11 ... Are integrated with each other to form a single plate-shaped cantilever type lining 10.

In the shed constructed as described above,
Since the lining 10 is a cantilever type, a downward rotation moment is generated around the top of the front wall pillar 7a at the tip side, but this is countered by the tension of the PC steel material 12b of the rear wall pillar 7b. . In addition, as a whole, a turning moment is generated in which the tip of the lining 10 is directed downward with the front edge portion of the foundation concrete board 6 as the center, but the total weight including the earth and sand a filled in the void 8 and the underground pile. This is opposed by the anti-pull force of 5b.

[0014]

As described above, in the cantilever type shed according to the present invention, the wall pillar constructed on the mountain side of the road is made to support the cantilever type lining to construct the foundation on the road valley side. Even if it is impossible, it is possible to install a shed, avoid dangerous work such as falling accidents due to foundation work on the valley side, protect nature on the valley side, and build structures such as pillars on the valley side of the road. Not built, so on the road,
Alternatively, the scenery on the valley side can be viewed while driving in a car, and it can be used in tourist spots. Further, since construction is performed only on the central mountain side of the road, there is an effect that there is no need to close the road during construction.

The lining, which is a superstructure, can be made a precast member to reduce on-site work and shorten the construction period. Further, by arranging the wall pillars in two rows and filling the space between them with earth and sand, there is an effect that the stability of the cantilever shed is good.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a cantilevered shed according to an embodiment of the present invention.

FIG. 2 is a plan view showing a cantilevered shed according to an embodiment of the present invention.

FIG. 3 is a side view of a PC board used for the above cantilevered shed.

FIG. 4 is a bottom view of the above.

[Explanation of symbols]

 a Sediment 1 Road surface 2 Tanigawa slope 3 Mountain side slope 5a, 5b Underground pile 6 Foundation concrete board 7a, 7b Wall pillar 8 Vacancy 9 Horizontal beam 10 Lining 10a, 10b, 12a, 12b PC steel 11 PC board 13 Fixing tool 14 Vertical Beam Section 15 Horizontal Beam Section 16, 18 PC Steel Material 17 Insertion Hole

Claims (1)

[Claims] 1. A foundation concrete board integrally provided on a concrete underground pile installed in the ground along a mountain side of a road, and a two-row arrangement standing on the foundation concrete board along the road. The front and rear wall pillars are provided, and a cantilever type lining that projects on the road by supporting one side of the both wall pillars is filled with earth and sand for gravity enhancement between the both wall pillars, and The lining is a cantilever type shed in which rectangular precast members are lined up, and PC steel materials are inserted continuously in the respective lateral directions and tensioned to integrate them.