PCウェル工法研究会 List of Products and Services

The PC well method involves stacking cylindrical single blocks at the construction site while introducing prestress using a post-tensioning method. The interior is excavated using various excavation machines such as hammer grabs, and ground anchors are driven and installed to a specified depth as a reaction force. The single blocks are equipped with PC copper rods, rebar placement holes, grout injection ports, and anchor plates, designed to standardize work at the construction site. The excavation methods include in-bucket excavation with hammer grab buckets and undercutting with widening excavators, making it suitable for a wide range of soil types. There are two types of PC wells: PC structure and PPRC structure. Features of the method: 1. It uses factory-manufactured precast components, ensuring thorough quality control, making it a highly reliable method. 2. Construction management is easy. 3. Since it is installed using a jacking method, it has minimal impact on the surrounding ground and is suitable for close-proximity construction. 4. It allows for low vibration, low noise, and high safety during construction. 5. It does not require temporary closures or island construction even for underwater work. 6. The construction accuracy is excellent. 7. The construction period can be shortened.

• Ground foundation construction method

This construction method overcomes the issues associated with traditional open caisson methods by utilizing advanced technology, enabling reliable and high-precision sinking of caissons under various ground conditions. It is environmentally friendly and allows for significant labor savings and shortened construction periods through automation. The key feature of this method is the introduction of an automatic underwater excavation machine at the caisson's cutting edge, which allows for reliable excavation of the ground directly beneath the caisson, a task that was previously difficult. This excavator can handle hard ground and withstand water pressure of up to 1.0 MPa, making it capable of construction at depths of up to 100 meters. Since the excavation and soil removal operations can be performed independently, it is also applicable to large-diameter shafts. The method consists of three systems: an automatic excavation and soil removal system, an automatic sinking management system, and a precast body system, making it applicable to a wide range of ground conditions from soft soil to medium-hard rock. These systems can be used in combination, or each system can be employed individually or in pairs depending on the site conditions.

• Ground foundation construction method