JPH0551928A - Sheathing construction - Google Patents

Abstract

PURPOSE:To reduce the number of guide piles, and save a construction term and cost, and execute work efficiently by spraying arched excavated surfaces between the guide piles embedded into ground, formed to be excavated in a state recessed to a natural ground side, with solidifying material. CONSTITUTION:Guide piles 1 consisting of H-shape steels and the like along a designed sheathing line are embedded into ground at specified intervals in the plumb direction, and after that, along the designed sheathing line, surfaces to be excavated between the respective guide piles 1 are excavated in a state recessed in the shapes of arches to a natural ground side, and arched excavated surfaces 2 are formed. After that, along with the progress of excavation, the arched excavated surfaces 2 are sprayed with the solidifying material 3 of the great compressive strength of concrete or the like in a required thickness. Then, a fulcrum reaction force V, a horizontal reaction force H, and an arch axial-force N are transmitted to the guide piles 1 through arch rings 4 on a natural-ground rear-side surface and the solidifying material 5, and a bearing force is increased with arch working by using the timbering effect of the natural ground itself and loading earth pressure, and distances between the guide piles 1 are contrived to be made long.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining method for root cutting work.

[0002]

2. Description of the Related Art One of the earth retaining methods for root cutting work is the parent pile side sheet pile method. As shown in FIG. 2, this parent pile side sheet pile construction method embeds steel parent piles a in the ground along a planned earth retaining line at appropriate intervals (1 to 2 m).
As the root cutting progresses, the horizontal sheet pile b is fitted between the main piles a to form the earth retaining wall.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There are the following problems. That is, in the conventional parent pile side sheet pile construction method, there are many cases where wood is used for the side sheet pile b, and it is necessary to use a thicker material as the excavation depth becomes deeper. Therefore, workability such as cutting and mounting of the horizontal sheet pile b is deteriorated, which leads to a decrease in construction efficiency and requires a large amount of human power, which is uneconomical. Moreover, in order to fit the horizontal sheet pile b between the main piles a, an over digging is necessary,
Prone to sinking.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to improve the construction efficiency and to make sure and economical construction of the earth retaining structure. The purpose is to provide a construction method. That is,
INDUSTRIAL APPLICABILITY The present invention, in the earth retaining method in root cutting work, embeds the parent piles vertically in the ground at a predetermined interval along the planned earth retaining line, and the excavation surface between the parent piles is arched on the ground side. The earth retaining method is characterized in that the ground is cut in a recessed state, and a solidifying material is sprayed onto the arched excavation surface.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. <A> Placing the main piles As shown in Fig. 1, the main piles 1 are vertically embedded in the ground along the planned earth retaining line at predetermined intervals. As the material of the main pile 1, H-shaped steel, I-shaped steel, rails, or the like can be used. As a method of embedding the parent pile 1, it is preferable to use a method of inserting the parent pile 1 after drilling the pile position with an auger or a boring machine in order to prevent noise, vibration, etc., in addition to driving.

<B> Excavation of natural ground After the completion of the construction of the main pile 1, root excavation of the natural ground is performed along the planned earth retaining line. At this time, the excavation surface between the respective main piles 1 is excavated in a state of being recessed in an arch shape on the side of the natural ground to form an arch-shaped excavation surface 2.

<C> Spraying of the solidifying material The solidifying material 3 is sprayed on the arched excavation surface 2 as the root excavation proceeds so as not to collapse the ground. Solidifying material 3
As the material, a material having high compressive strength such as concrete or mortar is used. The spraying thickness of the solidifying material 3 is arbitrarily selected according to the earth pressure.

[0008]

As shown in FIG. 1, since the main piles 1 are formed in an arch shape, a fulcrum reaction force V, a horizontal reaction force H, and an arch axial force N act on the main piles 1 due to the arching action. The transmission of the force to the parent pile 1 is performed through the arch ring 4 and the solidifying material 3 formed on the back surface of the natural ground. Since not only the solidifying material 3 but also the supporting effect of the ground itself can be used to bear the earth pressure, the reaction force transmitted to the parent pile 1 is smaller than that in the case where it is not formed in an arch shape. Therefore, since the supporting force against earth pressure increases due to such arch action, the main pile 1
The distance between them can be made longer than before. When the distance between the main piles 1 becomes long, the moment generated on the arch surface also becomes large, and a tensile force may be generated in the solidified material 3. In such a case, it is possible to cope with this by attaching a reinforcing member having a tensile force such as a welded wire mesh to the root cutting ground and then spraying the solidified material 3.

[0009]

Since the present invention is as described above, the following effects can be obtained. <A> Since the supporting force against earth pressure is increased by the arch action, the distance between the main piles can be made longer than before. Therefore, the number of parent piles to be installed can be reduced, and the construction period and construction cost can be reduced.

<B> Conventionally, the work of fitting the horizontal sheet pile has been complicated, but since the present invention is a method of spraying the solidifying material on the arch excavation surface, it can be efficiently performed by a small number of people.

<C> Since the solidified material is sprayed directly on the excavated surface of the arch, no gap is generated between the ground and the back ground, so that the back ground can be prevented from moving and sinking.

<D> The spraying thickness of the solidifying material can be arbitrarily selected according to the earth pressure, so that a rational design can be achieved without waste.

[Brief description of drawings]

FIG. 1 is an explanatory view of the earth retaining method of the present invention.

FIG. 2 is an explanatory diagram of a conventional technique.

Claims (1)

[Claims] 1. In the earth retaining method for root cutting work, main piles are embedded vertically in the ground along a planned earth retaining line at predetermined intervals, and the excavated surface between the main piles is arched to the ground side. The earth retaining method is characterized in that the root of the natural ground is cut in a state of being recessed, and the solidified material is sprayed onto the arched excavation surface.