The lowering systems developed by Herrenknecht for the mechanical lining of vertical and inclined shafts up to 25° to the vertical offer a high degree of safety and productivity.
Herrenknecht supplies the right solution for every application. The system can be defined and configured according to the geological conditions, the shaft specifications and the lining requirements.
Lining Lowering System – Jacking Frame
The lowering unit is based on the proven pipe jacking technology, which is already used successfully worldwide in several Herrenknecht products such as BBM systems or Micro Tunnelling.
The lowering unit is composed of a jacking frame that enables the lowering and raising of the lining rings in the shaft. The jacking frame also allows the lining rings to be pressed in difficult geological conditions. The lining rings are held in position with the jacking frame via retractable and extendable grab pins which transmit the forces required to hold, lift, lower or press the entire shaft lining.
The lining rings have corresponding pockets to receive the grab pins. These pockets can also be retrofitted to existing lining rings.
This Lining Lowering System is typically used for:
- Lining lowering operations for vertical and inclined shafts in stable and fractured geology.
- Subsequent lining installation after the sinking of shafts using raise boring or boxhole boring systems.
- Shaft maintenance operations, shaft lining replacement.
Lining Lowering System – Strand Jack
The lowering unit is based on the proven strand jack technology that is already successfully used worldwide in the VSM by Herrenknecht.
The lowering unit consists of several strand jack units, which are arranged symmetrically around the shaft and connected by a circular base frame.
Depending on the available space and site conditions, each strand jack unit on the circular basel frame can be continuously adjusted from 0° to 90° to the shaft edge.
On request, the lowering unit can also be configured with two (standard configuration) or three strand jack units, which are available with a load capacity of up to 200 tons per unit.
The modular design of the lowering unit enables the entire system to be quickly and easily adapted to the requirements of the jobsite. The base frame can be adapted to the individual requirements, such as available space, type of lining, shaft depth and diameter.
This Lining Lowering System is typically used for:
- Lining vertical shafts, in stable geology.
- Co-operation with boxhole backreaming machine technology.
- Subsequent lining installation for vertical shafts realized by raise boring or boxhole boring systems
Functional principle
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