JPS60215921A - Formation of cut slope - Google Patents

Abstract

PURPOSE:To safely and exactly form a cut slope by a method in which a slope is divided into a heightwise section and a widthwise section to form small divisions, and cut slopes and protection works are formed stepwise for every division from the upper stage ones to the lower stage ones. CONSTITUTION:A cut slope is divided into sections of almost equal heights h1- hn in the heightwise direction, and these are set up as upper and lower construction divisions a1-an. Even the widthwise direction of the slope is divided into plural sections of widths to set up sideward construction divisions b1-bn, and the divisions b1-bn are further divided into small construction divisions c1-cn. The end division c1 in the uppermost stage constructing division a1 is excavated to form a cut slope 1, and then a protection work is applied. The construction is continued in the order of c2, c5, c3, c6, c9,... to complete the formation of all slope.

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 rock of bolts.

This is because protection works such as hammering have been applied. However, in order to cut the entire slope at a stable slope in this way, the slope must be long and the slope must be deep, so the amount of excavation required will be enormous, and the site area occupied during construction will also increase. There are many problems, such as the need for large-scale protection works depending on the conditions of the slope.

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 and then the protective work is applied, so depending on the ground conditions, the construction may be extensive, requiring a great deal of labor and cost.

This invention was proposed in order to solve the above-mentioned conventional problems, and is designed to construct a steeper slope than a conventional cut-out slope while keeping the slope stable, and to maintain the slope. It is. 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. A feature of this system is that protection work is performed immediately after each excavation, and after ensuring the stability of the excavated area, construction begins on the next sub-area, and such construction is repeated, thereby ensuring safety. In addition to making it possible to safely and reliably construct slopes that are steeper than slopes and to provide protection works used to stabilize slopes after construction,
The aim is to simplify the construction of protection works, greatly reduce the site area for construction, 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 entire slope to be constructed is divided into a plurality of sections in the height direction and the width direction, thereby setting a large number of subdivisions, and excavation and protection work can be performed using these subdivisions as construction units. This is a major feature.

For example, as shown in Fig. 1, the cut slope to be constructed has a plurality of approximately equal heights in the height direction.

~hn, and set these as upper and lower construction divisions a1 to an.Furthermore, in the width direction of the cut slope to be constructed, the width direction of the cutting slope to be constructed is divided into % multiple footstones ~A'n, and horizontal construction Category b1-b
By setting n, a large number of small sections are constructed on the cut slope C1~
Set Cn. Construction will then proceed in each subdivision.

That is, as an example, as shown in FIG. Protection works are applied to the soil slope. Various methods can be used for protection, but in general, surface protection materials and reinforcing materials are installed to ensure slope stability. In this case, shotcrete is installed as the surface protection material 2, and anchor bolts, wires, etc. are installed as the reinforcing material 3. Further, if a plate-shaped protective material such as a precast concrete plate is used as the surface protective material, high strength can be obtained and construction can be greatly simplified. In this way, a stable slope 1 of the subdivision CI at the end of the uppermost stage is created.

Next, excavation, evacuation, and protection works for the subdivision C6 adjacent to the subdivision C1 are carried out in the same manner to create a stable slope. Next, construct the subdivision C8 located in the lower row of the subdivision C8, then construct the subdivision C3 in the upper row, then the subdivision C3 located diagonally below, then C, and so on. As shown in Figure 2, construction is carried out step by step in the subdivisions below, until the entire prescribed slope has been created.

In addition, the stepwise construction for each subdivision in this case is not limited to the step-like construction method described above, but for example, the construction for each subdivision in section a1 at the top step is first completed. After that, construction of the next stage sections a1 to ILn may be carried out sequentially.

Furthermore, how to proceed with the construction of making the subdivision into a stair-like shape is as follows:
As shown in FIG. 3, the construction may be carried out in the form of intermediate steps, with the subdivisions in the center being preceded. Further, contrary to the method shown in Fig. 3, 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, drainage, and protection work are carried out for each subdivision, and these works are carried out one after another until the creation of the cut slope is completed.

As explained above, when excavating the ground and constructing a cut slope, the present invention divides the entire slope to be constructed into a plurality of sections in the height direction and width direction, and sets a large number of subdivisions. , these subdivisions are treated as each construction unit category, and the cutting slope is formed and the protection for the slope is performed step by step for each subdivision, from the upper subdivision to the lower subdivision. As a result, the slope to be cut during excavation will be stabilized even if the slope is greater than the stable slope of the entire construction slope, as the release stress will be distributed due to the arch action. For cut/earth slopes with larger slopes, protection works will be installed before construction of other parts to ensure slope stability.

Since the construction work for each subdivision is carried out in stages, construction is carried out while ensuring the stability of the slope, and the slope of the construction slope as a whole is lower than the previously established stable slope. It can be steeply sloped,
As a result, the site area occupied during construction can be greatly reduced, and the protection work can be simplified and requires less labor.In addition, the protection work can be used as a protection work after the slope is created. It has many excellent effects, such as making it possible to create cut slopes economically.

[Brief explanation of drawings]

The drawings are illustrative of the mode of implementation of this invention, and Fig. 1 is a slope view showing the setting of construction sections, and Fig. 2 is a slope view showing the setting of construction sections in Fig. 1. Slope total height a...Upper and lower construction division b...Horizontal construction division C...Small construction division 1...Cut slope 2... ...Protective material 3...Reinforcement material patent applicant Minoru Yamamoto (and 2 others) Figure 3

Claims (1)

[Claims] When excavating the ground and constructing a cut slope, the entire construction slope is divided into multiple sections in the height direction and also into multiple sections in the width direction, and a large number of subdivisions are set. With each subdivision as a construction unit, form a cut slope and perform protection work for the slope in stages from the upper subdivision to the lower subdivision. A method for constructing a cut slope, which is characterized by the following.