JPS5926727B2 - How to create a cut slope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a cut slope in which cutting and protection works are performed on the slope while keeping the cut slope stable.

Conventionally, the ground is excavated to form a cut slope, and protection works are applied to this.In this case, the entire slope is cut at a stable slope, and then surface treatment and lock Protective work such as driving bolts has been done.

However, in order to cut the entire slope with a stable slope like this,
Because the slope is long (and the depth of the slope is also deep), the amount of soil excavated becomes large, and the site area occupied during construction also becomes large. There is a problem with Article (.

In this situation, cutting the slope with a larger slope is advantageous in that the depth of the slope becomes shallower and the site area occupied for construction can be reduced, but on the other hand, it is difficult to ensure the stability of the slope. Since the rate will be smaller,
If appropriate measures are not taken during construction, not only will there be danger during construction, but there will also be problems in protecting the slope after the cutting work is completed.

Furthermore, in the conventional construction method, the entire slope is cut out before the protection work is applied, so depending on the ground conditions, the construction can be laborious and requires a great deal of labor and cost.

This invention was proposed to solve the above-mentioned conventional problems, and is designed to construct and protect slopes that are steeper than conventional cut slopes while maintaining slope stability. be.

In other words, whereas conventional construction methods separate excavation and protection works and construct them independently, this method prevents slope instability caused by excavation by excavating small areas. After each excavation, protection work is carried out immediately after the excavation, and after ensuring the stability of the excavated area, construction begins on the next sub-division area, and such construction is repeated.
This makes it possible to safely and reliably construct slopes that are steeper than the safe slope and to construct protection works used to stabilize the slope after construction, as well as simplifying the construction of protection works and making it possible to secure the site for construction. The idea was to greatly reduce the area and make it possible to create cut slopes economically.

Embodiments of the present invention will be described below with reference to the drawings.

In this invention, the construction of the entire slope to be excavated is divided into multiple stages.

For example, as shown in Figures 1 and 2, the total height H of the cut slope to be excavated is divided into multiple approximately equal heights h1 to hn, and these divisions are set as construction divisions a1 to afi. do,
The construction will proceed step by step from the upper construction section a1 to the lower section.

The height of this construction section is set to a height that will ensure stability of the slope during excavation, depending on the ground conditions and the slope of the cut slope.

The construction work proceeds based on the settings as described above. First, excavation and soil removal are performed in the uppermost construction section a1 to form a cut slope s1 of a predetermined slope.

Next, protection work is performed on the cut slope s1.

Protection works are carried out by various known means, but generally, surface protection materials and reinforcing materials are installed to ensure the stability of the slope.

That is, shotcrete or a precast concrete plate is installed as the protective material 1 on the cut slope s1, and anchor bolts, wires, etc. are installed as the reinforcing material 2.

As a result, a stable slope s1 of the uppermost section a1 is created.

Next, the excavation, earth removal and protection works of the lower construction section a2 are carried out in the same manner as the previous section a1 to create the slope s2, and the following steps a
Construction is carried out step by step in stages from 3 to 1 to complete the construction of all the predetermined slopes.

Fig. 3 and Fig. 4 show a method of carrying out the above-mentioned staged construction in smaller parts. In this embodiment, in addition to the divisions h1 to hn in the height direction, the width of the slope is In the direction as well, this is divided into required lengths 1l-1n, and small construction sections are set, and construction is carried out step by step for each small section.

That is, first, the subsection 11 in section aI is set as the first subdivision.
As shown in the figure, excavation and soil removal are performed to form a predetermined cut slope 81, and then protection work is applied to the cut slope s1.

This excavation and protection work are the same as in the embodiments shown in FIGS. 1 and 2 above.

Next, subdivision a adjacent to these subdivisions a1 to 11
1 to 12 or a2 to 11 are constructed in the same manner as above.

In this way, each adjacent subdivision is constructed one after another, creating a step-like structure as shown in Figure 2, and the construction of the entire cut slope is completed.

As shown in FIG. 5, the construction may be carried out to make the subdivisions into a step-like shape, with the subdivisions in the center being placed first, and the construction being carried out in the form of steps in the middle.

Further, contrary to the case shown in FIG. 5, the construction can be carried out so that the small sections of the slope are placed in advance to form a step pyramid shape.

In short, excavation, soil removal, and protection work are carried out for each subdivision, and these works are carried out in sequence to complete the creation of the cut slope.

As explained above, in the present invention, when excavating the ground and constructing a cut slope, the entire slope to be constructed is divided into a plurality of divisions at least in the height direction, and these divisions are used as construction unit divisions. From the construction classification to the lower construction classification,
Since the formation of cut slopes and protection works for the slopes are carried out in stages for each construction section, the destabilization of the cut slopes due to excavation can be prevented by excavating each subsection, and at the same time each excavation By providing protection work, the stability of the cut slope can be ensured, and therefore the slope of the cut slope can be made steeper than the stable slope, thereby reducing the site area occupied during construction. In addition to simplifying the protection work, it requires less labor, and the protection work can be used as a protection work after the slope is created, making it possible to create a cut slope economically. It has many excellent effects.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, and FIG. 1 is a perspective view showing the construction sections set, FIG. 2 is a slope view showing the construction mode according to the construction sections shown in FIG. 1, and FIG. Figure 3 is a slope diagram showing examples of setting other construction divisions, Figure 4 is a slope diagram showing construction modes according to the construction divisions in Figure 3,
Figure 5 is a slope diagram showing the construction mode at the site.

Claims (1)

[Claims] 1. When excavating the ground and constructing a cut slope, the entire construction slope should be divided into several sections (in the height direction), and these sections should be considered as construction unit sections, starting from the upper construction section to the lower section. A method for constructing a cut slope, the method comprising forming a cut slope and performing protection work for the slope in stages for each construction section.