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
Microsim Tunnel Safety 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.
Microsim Tunnel Safety 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.
Track Record
Projects & Case Studies
Sequential ExcavationA sequentially excavated adit through mixed face conditions, with support class adjusted at the face as ground changed and round length reduced where convergence readings indicated.
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TrenchlessA pipe jacking drive beneath an active rail corridor with jacking force monitoring, lubrication management and an intermediate jacking station, completed without track possession beyond the agreed windows.
View Details
RehabilitationConcrete repair, joint sealing, drainage restoration and invert reconstruction in an operating tunnel, staged in night closures with full reinstatement for service each morning.
View Details
Bored TunnelAn earth pressure balance drive beneath a built-up corridor with segmental lining and annulus grouting, face pressure controlled against automated surface settlement readings and compensation grouting available for sensitive structures.
View DetailsOur Mission
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.
Compliance
Every shift underground has experienced supervision present.
Share your alignment, geotechnical data and constraints with Microsim Tunnel Safety, and we will advise on methods, risks and a construction approach.
Ground conditions govern everything underground, so we invest in geotechnical review, baseline interpretation and contingency planning before committing to a method and schedule.
Our Process
We study geotechnical data, groundwater conditions, surface constraints and existing utilities, then select methods and identify where conditions could differ from baseline.
Excavation sequence, support classes, ground improvement, ventilation and the monitoring program with response levels and actions are planned and agreed before work starts.
Excavation proceeds with support installed per observed ground class, monitoring read on schedule, and advance parameters adjusted against instrument response.
Final lining, waterproofing, drainage and finishing works are completed, verified against specification, and handed over with as-built and monitoring records.
Our Services
Permeation and jet grouting, compensation grouting, dewatering, cutoff walls and ground freezing to control groundwater and improve ground before or during excavation, selected by permeability, grain size and the settlement sensitivity of what lies above.
Request a Quote
Installation and reading of surface and building settlement points, inclinometers, extensometers, convergence arrays, piezometers, tiltmeters, strain gauges and vibration monitors, with automated data acquisition, agreed response levels and documented action plans at each threshold.
Request a Quote
Sequentially excavated tunneling with shotcrete, welded mesh, lattice girders, steel sets, rock bolts, forepoling and spiling, with round length, support pattern and face division adjusted by observed ground class under an agreed excavation and support classification.
Request a QuoteInspection, assessment and rehabilitation of existing tunnels including concrete repair, crack and joint sealing, relining with segmental or sprayed systems, invert reconstruction, drainage restoration and work staged to maintain partial operation where the asset cannot be closed.
Request a Quote
Operation of earth pressure balance, slurry and open-mode machines with segmental lining erection, annulus grouting, face pressure management, cutterhead intervention planning and muck handling, including performance monitoring that detects over-excavation or face instability before surface effects appear.
Request a Quote
Trenchless installation of utility and drainage pipelines by microtunneling, pipe jacking and auger boring beneath roads, railways, rivers and structures, with line and grade control, lubrication management, jacking force monitoring and intermediate jacking stations on long drives.
Request a Quote
Construction of access, ventilation, launch and retrieval shafts using secant and tangent pile walls, diaphragm walls, caisson sinking, liner plate and shotcrete methods, with base stability analysis, dewatering control and permanent lining installed to the design requirements.
Request a Quote
Cast-in-place and precast final linings, waterproofing membranes, contact and backfill grouting, invert construction, drainage, portal structures and finishing works, with lining thickness, cover and watertightness verified against the specification.
Request a QuoteProjects & Case Studies
Sequential ExcavationA sequentially excavated adit through mixed face conditions, with support class adjusted at the face as ground changed and round length reduced where convergence readings indicated.
View DetailsTrenchlessA pipe jacking drive beneath an active rail corridor with jacking force monitoring, lubrication management and an intermediate jacking station, completed without track possession beyond the agreed windows.
View Details
RehabilitationConcrete repair, joint sealing, drainage restoration and invert reconstruction in an operating tunnel, staged in night closures with full reinstatement for service each morning.
View Details
Bored TunnelAn earth pressure balance drive beneath a built-up corridor with segmental lining and annulus grouting, face pressure controlled against automated surface settlement readings and compensation grouting available for sensitive structures.
View DetailsShare your alignment, geotechnical data and constraints with Microsim Tunnel Safety, and we will advise on methods, risks and a construction approach.
Settlement, convergence, groundwater and vibration are instrumented with response levels and action plans agreed in advance, not decided once a reading looks alarming.
Projects & Case Studies
A sequentially excavated adit through mixed face conditions, with support class adjusted at the face as ground changed and round length reduced where convergence readings indicated.
A pipe jacking drive beneath an active rail corridor with jacking force monitoring, lubrication management and an intermediate jacking station, completed without track possession beyond the agreed windows.
Concrete repair, joint sealing, drainage restoration and invert reconstruction in an operating tunnel, staged in night closures with full reinstatement for service each morning.
An earth pressure balance drive beneath a built-up corridor with segmental lining and annulus grouting, face pressure controlled against automated surface settlement readings and compensation grouting available for sensitive structures.
Our Advantages
Face pressure, grouting and advance rate are controlled against surface readings, and compensation grouting is available where sensitive structures lie above.
We read baseline reports critically and identify where data is thin, because committing a method to assumed ground is how underground projects fail expensively.
For utility crossings we evaluate trenchless options honestly against open cut, including the risks each method carries in the particular ground involved.
Ventilation, gas monitoring, ground control, refuge provisions, rescue arrangements and confined space procedures are managed to the standards underground work requires.
Monitoring thresholds come with predefined actions, so a high reading triggers a plan rather than an argument on site at two in the morning.
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.
Tunnelling is a trade learned underground. Our shift supervision has driven in similar ground, which is what keeps decisions quick and correct.
As-built alignment, lining records, grout logs and monitoring history are surveyed, compiled and issued, because the asset outlives the contract.
Response plans for inflow, loss of face pressure and unexpected obstruction are written and resourced before the machine enters the ground.
Track Record
Client Feedback
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.
Monitoring thresholds and the actions attached to them were agreed before excavation. When a building point moved, everyone already knew what would happen.
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.
Share your alignment, geotechnical data and constraints with Microsim Tunnel Safety, and we will advise on methods, risks and a construction approach.
Method statements are issued before any mobilization to site.
Questions & Answers
Often yes, with work staged into closure windows and full reinstatement before reopening. This constrains productivity considerably and requires meticulous planning of material, equipment and clean-up within each window, but it avoids extended closure of a critical asset.
By exclusion or control, depending on ground. Closed-mode machines, grouting, cutoff walls, dewatering and ground freezing are all options. Permeability and grain size govern which techniques work, and dewatering near settlement-sensitive structures requires particular care.
It happens, which is why we plan for reasonably foreseeable variation and maintain contingency support classes and methods. Differing conditions have contractual implications too, and accurate records of what was encountered protect both parties in that discussion.
Through face pressure management, controlled advance rate, prompt and complete annulus grouting, and ground improvement or compensation grouting where structures are sensitive. Instrumentation with agreed response levels makes the control active rather than retrospective.
Primarily by ground and groundwater conditions, then by diameter, length, alignment constraints and what lies above. Bored tunneling suits long, consistent drives; sequential excavation suits variable ground and changing cross sections; trenchless methods suit shorter utility crossings. Ground data quality determines how confidently any choice can be made.
Mechanical ventilation, continuous gas monitoring, ground control procedures, communication systems, refuge arrangements, rescue capability and strict confined space and entry control. Underground work does not permit shortcuts, and every crew member is trained in the emergency procedures.
Method statements are issued before any mobilization to site.
Contact
Method statements are issued before any mobilization to site.
Projects & Case Studies
Sequential ExcavationA sequentially excavated adit through mixed face conditions, with support class adjusted at the face as ground changed and round length reduced where convergence readings indicated.
View DetailsTrenchlessA pipe jacking drive beneath an active rail corridor with jacking force monitoring, lubrication management and an intermediate jacking station, completed without track possession beyond the agreed windows.
View DetailsRehabilitationConcrete repair, joint sealing, drainage restoration and invert reconstruction in an operating tunnel, staged in night closures with full reinstatement for service each morning.
View DetailsBored TunnelAn earth pressure balance drive beneath a built-up corridor with segmental lining and annulus grouting, face pressure controlled against automated surface settlement readings and compensation grouting available for sensitive structures.
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This Privacy Policy explains how Microsim Tunnel Safety ("we", "us", "our") collects, uses, discloses and protects information when you visit microsimtunnelsecurity.com or contact us about our services. We keep data collection to what is necessary to answer inquiries and deliver contracted work.
Information you provide directly. When you submit an inquiry form, send an email or call us, we receive the details you choose to share: your name, organization, email address, telephone number, the service you are asking about and the content of your message.
Information collected automatically. Our web server records standard technical data for each request, including IP address, browser type and version, operating system, the pages requested, the date and time of the request and the referring page. This information is used for security monitoring, fault diagnosis and aggregate traffic statistics.
We do not knowingly collect special category data, financial account numbers or government identification numbers through this website, and we ask that you do not send such information through web forms or unencrypted email.
We use the information we collect to respond to your inquiry, prepare proposals and scopes of work, deliver and administer contracted services, maintain project and service records, meet legal, regulatory, insurance and procurement obligations, and protect the security and integrity of our systems.
We do not sell personal information. We do not use the information you provide for behavioral advertising, and we do not share it with advertising networks or data brokers.
Where data protection law requires a legal basis, we rely on: your consent, where you have voluntarily submitted an inquiry; the performance of a contract, where processing is necessary to quote, mobilize or deliver services; compliance with a legal obligation, including records retention, tax, safety and public procurement requirements; and our legitimate interests in operating, securing and improving our business, balanced against your rights.
We may share information with service providers who act on our instructions, such as email and hosting providers, and with subcontractors we engage where disclosure is necessary to deliver the service. These parties are permitted to use the information only for the purpose for which it was shared.
We may disclose information where required by law, court order, regulatory authority or a public client exercising audit rights under a contract, and where necessary to establish, exercise or defend legal claims.
Inquiry correspondence is retained for as long as needed to respond and for a reasonable period afterwards for business continuity. Project and contract records, including service logs, inspection records and photographic documentation, are retained for the period required by the contract, by applicable statute of limitations and by insurance and audit requirements, after which they are deleted or anonymized.
We apply administrative, technical and physical safeguards appropriate to the sensitivity of the information we hold, including transport encryption for this website, access controls on internal systems, role-based permissions and staff confidentiality obligations. No method of transmission or storage is completely secure, and we cannot guarantee absolute security.
Depending on where you live, you may have the right to request access to the personal information we hold about you, to request correction of inaccurate information, to request deletion, to object to or request restriction of certain processing, to request a copy in a portable format and to withdraw consent you previously gave.
To exercise any of these rights, write to [email protected]. We will respond within the timeframe required by applicable law and may need to verify your identity before acting on a request.
Our service providers may process data in countries other than the one in which you reside. Where personal information is transferred across borders, we rely on lawful transfer mechanisms and require appropriate contractual safeguards from the receiving party.
Our services are directed to organizations and property owners, not to children. We do not knowingly collect personal information from children. If you believe a child has provided us with personal information, contact [email protected] and we will delete it.
This website may link to third-party sites, such as standards bodies or regulatory resources. We are not responsible for the privacy practices or content of those sites, and we encourage you to review their policies before providing information.
We may update this Privacy Policy to reflect changes in our practices, technology or legal requirements. The revision date at the top of this page indicates when it was last changed. Material changes will be made evident on this page.
Questions, requests or complaints regarding this policy may be addressed to Microsim Tunnel Safety, Roland Holstlaan 1115, 2624 KM Delft, Zuid-Holland, Netherlands, or by email to [email protected]. You may also have the right to lodge a complaint with your local data protection authority.
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By accessing or using this website you agree to these Terms. If you do not agree, please do not use the site. We may revise these Terms at any time by posting an updated version; your continued use after a revision constitutes acceptance of the revised Terms.
Descriptions of services, capabilities, standards, methods and past work are provided for general information. They are not technical specifications, engineering advice or a representation that a particular method is suitable for your site or your regulatory environment.
Capability, capacity and availability statements reflect our general practice and may change. Project figures and performance indicators are approximate and may be rounded or aggregated across contracts.
Submitting an inquiry through this website does not create a contract, reserve capacity or oblige either party to proceed. Services are performed only under a signed agreement, purchase order or awarded contract that sets out scope, specifications, schedule, price and terms. Where this website and a signed contract conflict, the contract governs.
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Do not send confidential, proprietary or sensitive information through web forms. Information you submit through this website is not treated as confidential unless a confidentiality agreement is already in place between us, and we may use it to respond to and record your inquiry.
Links to third-party websites, standards and publications are provided for convenience. We do not control and are not responsible for the content, accuracy or availability of third-party material, and a link does not imply endorsement.
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To the fullest extent permitted by law, Microsim Tunnel Safety will not be liable for any indirect, incidental, special, consequential or punitive damages, or for loss of profit, revenue, data or goodwill, arising out of or in connection with your use of this website, whether based in contract, tort, statute or otherwise. Nothing in these Terms limits liability that cannot lawfully be limited.
You agree to indemnify and hold harmless Microsim Tunnel Safety and its personnel from claims, losses and expenses arising out of your misuse of this website or your breach of these Terms.
We aim to keep this website available but do not guarantee uninterrupted access. We may suspend, withdraw or restrict all or part of the site for maintenance, security or business reasons without notice.
These Terms are governed by the laws applicable at the principal place of business of Microsim Tunnel Safety, without regard to conflict-of-law rules. If any provision is found unenforceable, the remaining provisions continue in full force.
Questions about these Terms may be sent to [email protected] or addressed to Microsim Tunnel Safety, Roland Holstlaan 1115, 2624 KM Delft, Zuid-Holland, Netherlands.
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The information on microsimtunnelsecurity.com is published by Microsim Tunnel Safety for general informational purposes. It is not professional advice for any particular site, project or regulatory situation.
Content on this website does not constitute engineering, environmental, legal, safety, regulatory or financial advice, and must not be relied upon as a substitute for a site-specific assessment by a qualified professional engaged under contract. Conditions, codes and permitting requirements vary by jurisdiction and by site.
Descriptions of past work, performance indicators and outcomes describe what was achieved under the conditions of those specific contracts. They are not a prediction, promise or guarantee of results on any other project. Every scope, site and schedule is different.
We take reasonable care to keep this website accurate and current, but we make no representation or warranty that content is complete, correct or up to date. Standards, regulations, specifications and our own methods change over time, and the site may not reflect the most recent position.
Images, illustrations and diagrams on this website are illustrative and may be representative rather than photographs of a specific project. Statistics and project figures are approximate, may be rounded and may aggregate results across multiple contracts and years.
References to standards, codes, certifications or industry bodies are for identification and context. Such references do not imply endorsement by, affiliation with, or accreditation granted by those organizations beyond what is documented in the certificates we provide on request.
Links to other websites are provided for convenience only. We do not control third-party content and accept no responsibility for its accuracy, legality or availability. Inclusion of a link is not an endorsement.
To the fullest extent permitted by law, Microsim Tunnel Safety accepts no liability for any loss or damage arising from reliance on information published on this website. Where we perform work for you, our obligations and liability are governed exclusively by the signed contract between us.
If you believe information on this site is inaccurate or out of date, please tell us at [email protected] so we can review it.
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Microsim Tunnel Safety is committed to making microsimtunnelsecurity.com usable by as many people as possible, including people who use assistive technology. This statement explains the measures we have taken and how to report a problem.
We aim to meet the Web Content Accessibility Guidelines (WCAG) 2.1 at Level AA as a target standard. Accessibility is treated as an ongoing obligation rather than a one-time project, and we review the site when we make significant changes to its structure or content.
Semantic HTML structure with a single main landmark, logical heading order and descriptive page titles, so screen reader users can navigate by structure.
A visible skip-to-content link, keyboard-operable navigation and menus, and focus styles that remain visible when navigating without a mouse.
Text and interface colors checked for contrast against their backgrounds, layouts that reflow at narrow widths and support browser text resizing without loss of content, and descriptive alternative text or accessible labels for images and icons that carry meaning.
Form fields with programmatically associated labels, required fields identified in text rather than by color alone, and link text that makes sense out of context.
Some decorative illustrations are presented without detailed descriptions because they convey no information beyond the surrounding text. Documents published in formats such as PDF may not meet the same standard as the website itself; we will provide an accessible alternative on request.
This website is designed to work with current versions of major browsers on desktop and mobile, used together with the assistive technologies available on those platforms. It may not perform as expected in browsers that are no longer supported by their vendor.
If you encounter a barrier on this website, or need information from it in an alternative format such as large print, plain text or a document read aloud, contact us at [email protected] or +31626664575. Please tell us the page address and what you were trying to do so we can reproduce the problem.
We aim to acknowledge accessibility reports within five business days and will tell you what we intend to do and when. If an immediate fix is not possible, we will provide the information you needed by another means.
If you are not satisfied with our response, you may escalate the matter to the body responsible for accessibility enforcement in your jurisdiction. This statement is reviewed periodically and whenever the website undergoes substantial change.
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The following images are published under Creative Commons licenses and are listed with their original title and attribution as given by the source.
Relining & Repair
Our crews are experienced in confined space, ventilation, ground control and emergency procedures, because underground work tolerates no improvisation in safety practice.
Experienced underground supervision on every shift
Who We Are
Microsim Tunnel Safety 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 spi
Our Services
Permeation and jet grouting, compensation grouting, dewatering, cutoff walls and ground freezing to control groundwater and improve ground before or during excavation, selected by permeability, grain size and t
View DetailsInstallation and reading of surface and building settlement points, inclinometers, extensometers, convergence arrays, piezometers, tiltmeters, strain gauges and vibration monitors, with automated data acquisiti
View DetailsSequentially excavated tunneling with shotcrete, welded mesh, lattice girders, steel sets, rock bolts, forepoling and spiling, with round length, support pattern and face division adjusted by observed ground cl
View DetailsInspection, assessment and rehabilitation of existing tunnels including concrete repair, crack and joint sealing, relining with segmental or sprayed systems, invert reconstruction, drainage restoration and work
View DetailsOperation of earth pressure balance, slurry and open-mode machines with segmental lining erection, annulus grouting, face pressure management, cutterhead intervention planning and muck handling, including perfo
View DetailsTrenchless installation of utility and drainage pipelines by microtunneling, pipe jacking and auger boring beneath roads, railways, rivers and structures, with line and grade control, lubrication management, ja
View DetailsProjects & Case Studies
Sequential ExcavationA sequentially excavated adit through mixed face conditions, with support class adjusted at the face as ground changed and round length reduced where convergence readings indicated.
View DetailsTrenchlessA pipe jacking drive beneath an active rail corridor with jacking force monitoring, lubrication management and an intermediate jacking station, completed without track possession beyond the agreed windows.
View DetailsRehabilitationConcrete repair, joint sealing, drainage restoration and invert reconstruction in an operating tunnel, staged in night closures with full reinstatement for service each morning.
View DetailsBored TunnelAn earth pressure balance drive beneath a built-up corridor with segmental lining and annulus grouting, face pressure controlled against automated surface settlement readings and compensation grouting available for sensitive structures.
View DetailsTrack Record
Our Advantages
Face pressure, grouting and advance rate are controlled against surface readings, and compensation grouting is available where sensitive structures lie above.
We read baseline reports critically and identify where data is thin, because committing a method to assumed ground is how underground projects fail expensively.
For utility crossings we evaluate trenchless options honestly against open cut, including the risks each method carries in the particular ground involved.
Ventilation, gas monitoring, ground control, refuge provisions, rescue arrangements and confined space procedures are managed to the standards underground work requires.
Monitoring thresholds come with predefined actions, so a high reading triggers a plan rather than an argument on site at two in the morning.
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.
Tunnelling is a trade learned underground. Our shift supervision has driven in similar ground, which is what keeps decisions quick and correct.
As-built alignment, lining records, grout logs and monitoring history are surveyed, compiled and issued, because the asset outlives the contract.
Response plans for inflow, loss of face pressure and unexpected obstruction are written and resourced before the machine enters the ground.
Sectors
Mining, energy and pipeline operators contract us for shafts and access tunnels.
Client Feedback
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.
Monitoring thresholds and the actions attached to them were agreed before excavation. When a building point moved, everyone already knew what would happen.
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.
From Our Desk
Boreholes spaced too widely hide the conditions that cause trouble. How to read a geotechnical baseline report for what it does not say.
Face pressure, advance rate and grouting must respond to instrument readings in real time. What a working monitoring and response regime looks like.
Rehabilitation under traffic demands planning of every material movement. How productive work gets done in six-hour windows.
Depth, ground, surface disruption, length and risk tolerance all weigh in. An honest comparison for utility crossings.
Share your alignment, geotechnical data and constraints with Microsim Tunnel Safety, and we will advise on methods, risks and a construction approach.