Method Statement: Artificial Ground Freezing for Cross Passage Construction Between Running Tunnels inspection and test plan example.

Inspection and Test Plan for Method Statement: Artificial Ground Freezing for Cross Passage Construction Between Running Tunnels

Q: How are hold points enforced in the ITP?

Hold points require Engineer/Independent Checker approval to proceed. Works cannot continue past a hold point without a signed release.

Q: What monitoring frequency is expected during freezing?

Thermistors logged continuously (typically 5–15 min intervals) with daily engineer reviews; alarm thresholds trigger immediate response [Verify per project specifications].

Q: What constitutes acceptance for excavation commencement?

Issue of a Closure Certificate confirming the target isotherm fully encloses the cross passage profile with the design wall thickness for the specified hold time, and all monitoring is within trigger limits.

AI-assisted inspection and test plan connected to a method statement, with PDF and Excel export.

Published 02 Jul 2026 Rev. 00 4 views

Disclaimer: This ITP is provided as a public reference document. Verify all inspection activities, acceptance criteria, and records against your project specifications, applicable standards, and contractual requirements before use. Quollnet accepts no liability for its application on any project.

About this ITP: This ITP defines inspections and tests for ground freezing of a tunnel cross passage, including drilling, grouting, brine system pressure tests, thermal monitoring, and closure verification before excavation.

More than a static template

Unlike a downloadable Word or PDF template, this ITP is an AI-assisted editable starting point directly connected to its method statement. Every inspection activity, hold point, and acceptance criterion is structured and ready to adapt to your project.

AI-assisted customization — Tailor inspection activities and acceptance criteria to your specific project scope.
Linked method statement — This ITP is connected to the corresponding method statement describing the work sequence.
Multiple export formats — Download as a formatted PDF or editable Excel spreadsheet.
Editable starting point, not a final document — Review and verify all content against your project specifications and standards before use.

Download ITP PDF Formatted ITP document Download ITP Excel Editable ITP spreadsheet Open Method Statement Method statement linked to this ITP

What you can customize

When you save this ITP to your account, every inspection row becomes editable. You can add, remove, or modify:

Inspection activity — Description of what is being inspected.
Inspection type — Hold point (H), Witness point (W), Review (R), or Monitor (M).
Responsibility — Contractor, subcontractor, engineer, or client.
Frequency — How often the inspection occurs.
Acceptance criteria — Referenced standard or specification requirement.
Records — Forms, test reports, or checklists required as evidence.

Why this ITP is used

To control quality and safety-critical stages of freezing and excavation, ensuring the frozen wall achieves design performance prior to opening works.

Who uses this inspection and test plan

Contractor QA/QC, Geotechnical Freezing Specialist, Engineer/Independent Checker, and the Tunnel Operator for key hold/witness points.

When this ITP is prepared and submitted

From mobilisation through drilling, grouting, installation, freezing, closure verification, excavation, primary lining, and controlled thaw/demobilisation.

Who receives or approves this ITP

The ITP is usually submitted to the client representative, consultant, resident engineer, or project management consultant for review and approval before the related work activity starts.

Inspection scope

Permits and pre-starts, drilling alignment, annular grouting properties, manifold pressure testing, thermistor commissioning, freezing performance, closure verification, excavation QA, and thaw approval.

Typical hold, witness, and review points

HP-1 Manifold pressure test; HP-2 Pre-freezing readiness; HP-3 Freeze closure verification; WP-1 Pilot breakthrough; HP-4 Controlled thaw approval.

Typical inspection records

PTWs, drilling logs, deviation/as-built surveys, grout tickets/tests, pressure test certificates, thermistor logs, daily freeze reports, closure certificate, shotcrete QA, and handover dossier.

Important approval note

This ITP is an AI-assisted editable starting point, not a pre-approved document. Before use on any project, all inspection activities, hold points, and acceptance criteria must be reviewed and approved by the relevant parties (superintendent, principal contractor, or client representative) in accordance with your contract and project quality plan.

Always verify acceptance criteria against your applicable drawings, specifications, and regulatory requirements. Hold points must be confirmed with the relevant authority before work proceeds past that point.