Trenchless technologies use a process called screeding, which is the placement of a thin layer of concrete over existing concrete to create a new underground structure. The process begins by installing a pipe into an existing structure and connecting it to the new structure. Water pressure is then applied to the pipe, causing it to expand from both ends. 

This causes the pipe to push on top of existing concrete, which in turn pushes on top of other pipes below that have yet to be installed. Once enough pressure has been applied and expanded, this entire network of pipes will begin to collapse like dominoes after being pushed up by the first one. Trenchless technologies occur at different rates depending on how much pressure is applied. The process is repeated until the entire basement has been filled with concrete.

Image Source Google

2. Reinforced Concrete

Reinforced concrete is a mixture of cement, steel and stone that is then cast into molds and cured in an oven. This can be done on site or in a factory setting. The method of choice for reinforced concrete installations is casting it into forms and curing them in an oven at temperatures above 400° Fahrenheit to create strong and solid buildings. 

It's sometimes used as the foundation for pillars, which are located underground to support other structures or beams above ground. Reinforced concrete panels can be installed on top of each other so they will fit together properly, or they can be left open so their shape can be changed to accommodate a new project.