Micro-tunneling Systems / Equipment

Micro-tunneling systems/equipment refers to specialized machinery and tools used for constructing small-diameter tunnels.

Definition:

Micro-tunneling systems/equipment refers to specialized machinery and tools used for constructing small-diameter tunnels with precision and accuracy in tunneling and underground structures. Micro-tunneling is a trenchless method that involves the use of a remote-controlled tunnel boring machine (TBM) to excavate the tunnel while simultaneously installing a pipe or conduit in the ground.

Uses/benefits:

Utility installations: Micro-tunneling is commonly used for the installation of utility pipelines, such as water supply lines, sewage pipes, telecommunications cables, and electrical conduits. It offers a precise and efficient method for underground infrastructure development.
Urban areas: Micro-tunneling is particularly beneficial in urban areas where space is limited and there are numerous existing utilities. It minimizes disruptions to surface traffic, buildings, and landscapes compared to traditional open-cut methods.
Environmental sensitivity: Micro-tunneling is an environmentally friendly technique as it reduces surface disturbance and minimizes the impact on natural habitats, water bodies, and sensitive ecosystems.
Accuracy and control: Micro-tunneling systems provide high levels of accuracy and control, allowing for precise alignment and grade control during tunneling operations. This ensures the proper installation of pipelines with minimal deviation.
Versatility: Micro-tunneling equipment can be used for a wide range of soil conditions, including cohesive soils, loose soils, and rocky formations. It is adaptable to different ground conditions and can overcome challenges such as groundwater and unstable soil layers.

Specifications:

Tunnel boring machine (TBM): Micro-tunneling systems utilize remote-controlled TBMs specifically designed for small-diameter tunnels. These machines feature a rotating cutting head, hydraulic jacking system, and pipe installation equipment.
Guidance system: Micro-tunneling equipment is equipped with a guidance system that ensures accurate alignment and grade control during tunneling. It may use laser, gyroscopic, or electronic guidance systems to maintain the desired path.
Pipe jacking system: The micro-tunneling equipment includes a pipe jacking system that pushes or pulls the pipe or conduit into the tunnel as the TBM progresses. It ensures continuous pipe installation and minimizes ground settlement.
Slurry system: In certain conditions, micro-tunneling systems use a slurry system for excavation support. The slurry acts as a lubricant and helps stabilize the tunnel face during excavation. It is later separated and treated for reuse or disposal.

Types:

Auger boring: This type of micro-tunneling uses an auger to excavate the soil, and the pipe is installed by manually pushing it into the tunnel.
Pipe jacking: Pipe jacking micro-tunneling systems employ hydraulic jacks to push the pipe into the ground as the TBM excavates the soil. It is a common method for installing larger-diameter pipes.
Guided boring: Guided boring systems use a guided auger or pilot tube to excavate the soil while maintaining precise alignment and grade control. The pipe is installed behind the auger or pilot tube.

Micro-tunneling systems provide a reliable and efficient method for constructing small-diameter tunnels in tunneling and underground projects. They offer benefits such as reduced surface disruption, accurate alignment, and the ability to work in various soil conditions. With their versatility and precision, micro-tunneling systems have become a preferred choice for utility installations in urban areas and environmentally sensitive locations.