In recent years, with the development of construction machinery and technology, cast-in-place reinforced concrete diaphragm wall combined with civil reverse construction method and supporting system has become a mature construction method of deep foundation pit, which is more reasonable in technology and economy, and provides conditions for the development of underground engineering to a deeper and wider space. Hydraulic grab is one of them. Today, Xinshi Machinery in Jiangdu District of Yangzhou City will tell you about the principle, characteristics and scope of application of hydraulic grab method.

I. Principles

1. After the guide wall is constructed on both sides of the longitudinal axis of the diaphragm wall, the grooves are excavated in segments.

2. Prepare high-quality mud and inject it into the groove to protect the wall.

3. After grooving, prefabricated steel cages are installed in the groove section.

4. Filling underwater concrete into the wall by the method of reverse top of conduit.

5. The adjacent wall sections are jointed to form an integral cast-in-situ reinforced concrete continuous wall.

CHARACTERISTICS
1. The diaphragm wall is excavated and grooved in sections, and the wall is protected by high quality mud. The diaphragm wall has good integrity, smooth wall surface and high verticality.

2. According to the thickness of the wall, using the corresponding joint form, pouring underwater concrete into the wall, has strong impermeability, shear and bending resistance.

3. Reliable construction of near-built buildings and maximizing the use of construction land.

4. Equipped with a computer control system, the slotting automation is high and the quality of the slotting is reliable.

5. The construction has high mechanization, low labor intensity, less construction personnel and high efficiency.

III. Scope of application

_Under all kinds of engineering geological conditions except medium and slightly weathered bedrock, the enclosure walls or structural walls of underground buildings (structures) and hydraulic structures are constructed.