When underpinning a house in London, dry packaging aids are used for balancing the building’s weight and restoring a collapsing frame. In buildings where the original foundation was built on deep ground, mass concrete underpinning is used. It is a more cost-effective method because, in excavations, less hardware is used.
Base and Beam Underpinning London
When underpinning a house in London, this method of aid is more of an addition or an improvement to the Mass Concrete process. This form of underpinning involves the construction under the current base of a single concrete beam to provide power. Instead of pouring concrete into open pits as in Mass Cement, the underlying frame and beam use steel bars to support them.
The process involves digging holes along the outside wall and covering them with cement at fixed intervals, lowering metal frames into the pits. The effect is cement beams reinforcing existing structures and thus a better frame. This underpinning approach, often used for underpinning foundations in London where buildings require additional floors and require architectural use change. It is used in foundations both shallow and deep.
Pile and Beam Underpinning London
For limited access systems that require deep foundations, this underpinning method is popular, with underpinning contractors in London often favouring it for many reasons. The process begins by digging a hole under the earth and through the existing wall of the base.
Underpinning in London using this method involves a hole that is designed to support a vertical concrete needle beam in the delivery of the load. Piles are then mounted with a steel frame for support on opposite sides of the gap or either side of the foundation wall.
With the needle beam going through the hole in the wall, the piles are then attached, firming up support. To fill gaps and add support to the beam, cement is applied. This process is used to move the existing load to a more secure and strengthened base from the initial framework. Others method of underpinning are:
Mini Piled Underpinning London
Underpinning contractors in London use this method, underpinning by cantilever needle beam method, and Pre-test method of underpinning.