The principle, characteristics, and applicable scope of hydraulic grab construction method.
Release time:
2018-09-10
In recent years, with the continuous development of construction machinery and the improvement of construction technology, the cast-in-place reinforced concrete diaphragm wall combined with the reverse construction method, supported by a protective support system, has become a mature deep foundation pit construction method. This approach is becoming increasingly reasonable in terms of technical economics, providing conditions for underground engineering to develop into deeper and broader spaces. The hydraulic grab is one such method. Today, I will explain the principles, characteristics, and applicable scope of the hydraulic grab method.
In recent years, with the updating and development of construction machinery and equipment and the continuous improvement of process technology, the cast-in-place reinforced concrete underground continuous wall combined with the reverse construction method, supplemented by a protective support system, has become a mature deep foundation pit construction method. It is becoming more reasonable in terms of technical economy, providing conditions for underground engineering to develop into deeper and broader spaces. The hydraulic grab is one of them, and today I will talk about the principles, characteristics, and applicable scope of the hydraulic grab construction method.
1. Principle
1. After constructing guide walls on both sides of the longitudinal axis of the underground continuous wall, excavate in sections to form a trench.
2. Prepare high-quality slurry and inject it into the trench wall.
3. After forming the trench, install prefabricated rebar cages inside the trench.
4. Use the guide pipe reverse top method to pour underwater concrete to form the wall.
5. Adjacent wall sections are connected in a joint form to create an integral cast-in-place reinforced concrete continuous wall.
2. Characteristics
1. The underground continuous wall is excavated in sections to form a trench, with high-quality slurry protecting the wall, automatic alignment and inclination correction, good integrity, flat wall surfaces, and high verticality.
2. According to the thickness of the wall, corresponding joint forms are used to pour underwater concrete to form walls with strong impermeability, shear resistance, and bending capacity.
3. Reliable construction close to buildings and structures, maximizing the use of construction land.
4. Equipped with a microcomputer control system, the trenching is highly automated, with real-time measurement and inclination correction, ensuring reliable trench quality.
5. High degree of mechanization in construction, low labor intensity, fewer required construction personnel, and high efficiency.
3. Applicable Scope
Applicable to various engineering geological conditions except for moderately and slightly weathered bedrock, for constructing protective walls or structural walls for underground buildings and hydraulic structures.
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