Midweight self-sinking MA System

Trench lining

Midweight self-sinking MA System

In cases where the ground is friable, sandy, or in the presence of groundwater, the self-sinking shoring is used: a 1.25 m pre-trench is dug and the pre-assembled box is lowered into the excavation. During this stage, the workers must not be in the pit. The excavator bucket is used to alternately press on the panels on the two sides of the box. The operation is repeated until the bottom of the pit is reached.

Midweight self-sinking MA System
  • 1. Moving the spacers
Midweight self-sinking MA System
  • 2. Riser assembly for self-sinking liner

The spacers are mounted on the panels using spring heads in order to facilitate the sinking. For deeper excavations, risers are used. Positioning of the risers is done using the excavator. The riser is attached to the excavator and then lowered on the box base that is already located in the excavation. A depth of 3.2 m can also be reached in this situation by using the shoring panel plus the riser. Panels can be connected together in order to achieve a continuous bond along the length. The liner can be moved using construction site equipment such as excavators, shovels and loaders. For all excavation operations, for setting the reinforcements, removing and moving them, the use of tracked machinery and not wheeled machinery is recommended so as to eliminate any operational problems at the site and overturning of wheeled machinery due to ground instability. Use approved operating and moving machinery.

Midweight self-sinking MA System
  • 3. Detail of double acting tilting screws
Midweight self-sinking MA System
  • 4. Detail of double acting tilting screws – inserting the pivot

The connection between the panels is made up of a fixed part and a moving part which is hooked to an extension made in various sizes which allows for a variable excavation width. In the self-sinking system, the double-acting tilting MA screw is essentially made up of an S275 pipe and a trapezoidal threaded rod.

Midweight self-sinking MA System
  • 5. Detail of double-acting tilting screws - inserting the cotter pin
Midweight self-sinking MA System
Midweight self-sinking MA System

Assembly and installation stages

- Lifting using the excavator
- Inserting in the trench
- Excavation using the bucket inside the spacers
- Alternately pushing the bucket on both sides of the self-sinking liner

Midweight self-sinking MA System
Midweight self-sinking MA System
 
 
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Trench lining

  • Midweight self-sinking MA System