Underground Safety Discipline
Ventilation, gas monitoring, ground control, refuge provisions, rescue arrangements and confined space procedures are managed to the standards underground work requires.
About Us
To build tunnels and shafts safely and to line, grade and tolerance, with methods selected from honest interpretation of the ground rather than from what a schedule would prefer.
Who We Are
About Our Company
Marthendal is a tunneling contractor delivering bored tunnels, sequentially excavated tunnels, shafts, microtunneling and pipe jacking, and tunnel rehabilitation. Our capability covers method selection and construction planning from geotechnical data, tunnel boring machine operations including segmental lining erection and grouting, sequential excavation with shotcrete, lattice girders, rock bolts and spiling, ground improvement by grouting, dewatering and ground freezing where conditions require, shaft sinking with secant pile, caisson and liner plate methods, ventilation and underground safety systems, and the instrumentation and monitoring programs that underground work in urban settings demands.
Marthendal works with agencies, utilities and consultants near . Underground construction is governed by ground behavior more than by any other factor, and the most expensive mistakes come from committing to a method before the geology is properly understood. We read geotechnical baseline reports critically, identify where data is thin, and plan for the conditions that could reasonably be encountered rather than only the expected case. Our monitoring programs define response levels and the actions associated with each before excavation begins, so when an instrument reads high the response is a prepared plan rather than a site discussion under pressure.
Core Capabilities
- Grouting volumes and pressures are logged and compared against theoretical.
- Trigger level exceedances follow a pre-agreed action plan, not a discussion.
- Segmental and sprayed linings are built to specified thickness and tolerance.
- Shaft construction sequencing and support are designed and checked by engineers.
- Ventilation, gas monitoring and egress are maintained on every shift.
- Groundwater control is designed and monitored throughout the excavation.
Our Mission
To protect the people working underground and the structures above through disciplined ground control, ventilation and instrumented monitoring with prepared responses.
Track Record
By The Numbers
45 kmTunnel Advanced To Date
8.5 mLargest Bored Diameter
12 mmTypical Settlement Trigger Level
24/7Automated Monitoring Coverage
Our Advantages
Why Clients Choose Us
Settlement Managed Actively
Face pressure, grouting and advance rate are controlled against surface readings, and compensation grouting is available where sensitive structures lie above.
Geotechnical Review Taken Seriously
We read baseline reports critically and identify where data is thin, because committing a method to assumed ground is how underground projects fail expensively.
Experienced Underground Crews
Tunneling skill is built over years and cannot be improvised. Our crews and shift supervisors have worked through difficult ground and know the warning signs.
Trenchless Where It Suits
For utility crossings we evaluate trenchless options honestly against open cut, including the risks each method carries in the particular ground involved.
Response Plans Prepared In Advance
Monitoring thresholds come with predefined actions, so a high reading triggers a plan rather than an argument on site at two in the morning.
Records At Handover
As-built alignment, lining records, grout logs and monitoring history are surveyed, compiled and issued, because the asset outlives the contract.
Owners Kept Informed
Monitoring data, advance rates and grout volumes go to the owner as they are recorded, so nobody learns about a problem from a surface crack.
Ground Data Drives Method
Boring, sequential excavation and pipe jacking each suit different ground. We read the investigation and the risk register before proposing anything.
Compliance
Standards & Credentials
- Licensed Professional Engineers On Staff
- MSHA & OSHA Underground Training
- Confined Space Entry & Rescue Certification
- ACI Shotcrete Nozzleman Certification
- ISO 9001 Quality Management
- ISO 45001 Occupational Health & Safety
Surface structures are surveyed before and during the drive.
Sectors
Who We Serve
Transit and rail agencies and water utilities award us drives and shaft works.
- Transit & Rail Agencies
- Water & Wastewater Utilities
- Highway Departments
- Mining Operators
- Energy & Pipeline Companies
- Civil Engineering Consultants
- Municipal Public Works
Client Feedback
What Clients Say
They flagged thin geotechnical coverage along one stretch during tendering and priced contingency support for it. We hit exactly the conditions they anticipated and the drive continued without a claim fight.
R. ThorvaldsenProject Director, Transit Agency Client
Monitoring thresholds and the actions attached to them were agreed before excavation. When a building point moved, everyone already knew what would happen.
E. KacprzakResident Engineer, Civil Consultant
They rehabilitated an operating tunnel in night windows for four months and handed it back clean every single morning. That discipline is harder than the engineering.
D. OyelaranAsset Manager, Water Utility Client
Have An Underground Project?
Share your alignment, geotechnical data and constraints with Marthendal, and we will advise on methods, risks and a construction approach.
