Let’s know how to strengthen of the collapsed buildings (Underpinning). Procedures are as follows.
Explore the building by an engineer or an expert to assess the issue of settlement,
Explore inspection for damage survey of buildings (Visual Inspection).
Explore the settlement of the building by tilting the camera (Settlement Surveying).
Explore the cracks of the building structure (Structural Crack Mapping).
Evaluation of the twisted structure (Angular Distortion) in some cases may need to explore more in depth, such as partial soil foundation (Soil Investigation) to dig exploring the foundations (Test Pit) to determine the length of the pile, by the way ”Seismic Test” or explore the long-term follow up of settlement (Long Term Settlement Monitoring) etc.
Just to know the causes. Engineers will evaluate the load of the building (Column Load), then the position will strengthen the pile - quantity a pile - the length of the pile. The underpinning may choose to support a position that has been damaged (Partially Underpinning), but the building collapsed due to the tilt - it may be necessary to do all (Completely Underpinning).
Excavation work near the area where the original pillar depth about 1.5 meters and wide about 80 cm after the original pillar press compiled by Hydraulic Jacking into the soil one by one and connecting rods, each rod until the depth of the pile is on target of the engineer. And then placing cements it into a pile for durability and corrosion protection of groundwater.
The bracing structure with Screw Jack to demolish the existing foundation. The new foundation is a steel frame (Steel Frame) or concrete. (Reinforcement Concrete).
To transfer loads to the pillar. (Pre-Loading) using a 100-ton crane to emphasize that the new piles or new pillar. The pillar load can be used without a settlement later.
In case that the building has to level (Lifting) the structure will be braced with Screw Jack and then cutting the mast cleat. 50-100 ton crane to install and replace the building and then adjust the level or height in requires.
Underpinning used small of space to work and no adverse on the building because there is no vibration, no noise, no dust and smoke at work and can stay in the building as usual.
Micro Pile is a steel rod of 1 meter (Segmental Steel Pipe) in diameter from 3-10 inches, which is determined by engineers.
A hydraulic jack is used to push the pile and Pre-Loading through the calibration which was accepted by the agency.
Underpinning should be placed in the supervision of an engineer or experienced professionals.