18-12, Nishiochiai 2-chome,
Shinjuku-ku, Tokyo 161-8575, Japan
Phone: +81-3-5906-0211
FAX: +81-3-5906-0112

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Water Resource Development

BACKGROUND & PURPOSE OF PROJECT

When carrying out construction work on a slope, it is common to cut into the slope or retain the earth by using soldier beams. However, where there is a steep slope, a large scale sliced earth cut is required, a technique that damages the environment and produces a huge amount of excavated soil. When using soldier beams, it is necessary for long beams to be driven on the slope, and to install a ground anchor and other earth retainers while excavating. This involves a great deal of expense, causes delays in construction and there are a number of problems related to its construction. The "Takewari" (Split Bamboo) method was developed to solve these problems by utilizing the power of the nature in combination with its circular shape.

- Characteristics
- Minimizes damage to the natural environment by minimizing the area required for excavation.
- Unlike the earth cut method, this method does not significantly spoil the scenery.
- Utilizes the natural strength of the slope through spraying and reinforcement.
- The circular shape of the earth retainer minimizes the disturbance the construction has on the earth pressure balance.
- Using this method is more economically efficient and has a shorter construction schedule compared to the conventional soldier beam method.
We conducted an analysis of this method and examined its design under the direction of the Research Institute of Japan Highway Public Corporation, and prepared a manual for design and construction using the method.

CHARACTERISTICS, CONCEPT, STANCE & SKILLS OF PROJECT

To construct a structure on a slope, it is necessary to widely excavate the ground. However, this project adopted the use of the "Takewari" (Split Bamboo) method, whereby it is only necessary to excavate inside the cylindrical structure.

EFFECT OF PROJECT

・Improvement in terms of work safety due to reductions in cut earth.
・Cost reduction
・Reduction to the impact on the natural environment.