Myzox Monitoring Prism for Tunnel and Underground Construction Monitoring Malaysia
Myzox Monitoring Prism for Tunnel and Underground Construction Monitoring
Tunnel and underground construction projects may require repeated surveying observations of nearby buildings, retaining structures, tunnel-related structures and other selected monitoring points.
The Myzox TK-10S / TK-10 Monitoring Prism L-Bar Type provides a compact fixed optical target for total station measurements, making it suitable for selected tunnel, underground construction and structural deformation monitoring applications in Malaysia.
Once securely installed, the same monitoring target can be repeatedly observed throughout different construction stages.
MTM Precision Sdn. Bhd. is an authorized distributor of Myzox in Malaysia.
Why Is Monitoring Used Around Tunnel Projects?
Tunnel and underground works can take place beneath or close to existing infrastructure.
Depending on project requirements, monitoring may be specified for:
Existing buildings
Retaining structures
Roads
Bridges
Railway infrastructure
MRT structures
Excavation support systems
Other selected structures
The objective is to obtain repeated measurements at predetermined locations and evaluate changes over time.
Where Can Monitoring Prisms Be Installed?
Depending on the monitoring design, fixed prism targets may be installed on selected:
Building façades
Structural columns
Concrete walls
Retaining walls
Bridge elements
Infrastructure structures
Portal structures
Other stable mounting locations
Target placement should be determined according to engineering requirements and total station visibility.
How Does Prism-Based Tunnel Monitoring Work?
The basic concept is straightforward.
Step 1: Install fixed monitoring targets.
Step 2: Establish stable survey control.
Step 3: Measure the initial target positions.
Step 4: Establish baseline data.
Step 5: Begin construction or tunnelling activity.
Step 6: Repeat total station observations.
Step 7: Compare measurements.
The prism remains the physical optical target throughout the process.
Monitoring Buildings Above or Near Tunnel Works
Existing buildings located around underground works may form part of a monitoring program.
Prisms can be installed at predetermined structural locations before the relevant construction activity begins.
For example:
Building A
MP01
MP02
MP03
Building B
MP04
MP05
MP06
Repeated total station observations provide a measurement history for these selected points.
Tunnel Portal Monitoring
Tunnel portal areas may involve:
Excavation
Retaining structures
Slopes
Concrete structures
Temporary works
Fixed monitoring prisms can provide repeatable targets at selected locations where optical total station monitoring is appropriate.
The exact target positions should follow the monitoring design.
Underground Station Construction
MRT and railway stations may require significant excavation and structural works.
A possible monitoring sequence is:
Pre-Construction Baseline
↓
Initial Excavation
↓
Intermediate Excavation
↓
Final Excavation
↓
Station Structural Works
↓
Completion
Fixed prisms can remain part of the observation network throughout these stages where site conditions permit.
Retaining Wall Monitoring Around Underground Works
Underground construction often requires retaining systems.
Monitoring prisms can be positioned along selected sections.
For example:
RW01 — RW02 — RW03 — RW04 — RW05
A total station can repeatedly measure the targets and compare their measured positions.
This provides positional monitoring information at different sections of the retaining structure.
Myzox TK-10S / TK-10 Specifications
SpecificationDetailsModelsTK-10S / TK-10TypeMonitoring Prism L-Bar TypePrism Diameter1 inch / 25 mmPrism Constant-25 mmPrism Height60 mmBeam Deviation5″DimensionsH90 × W86.5 × D30 mmWeightApprox. 207 gAdjustmentX/Y direction
Its compact configuration is useful for fixed monitoring points where a conventional prism pole arrangement is impractical.
Why Use a Fixed Prism Instead of a Prism Pole?
A prism pole is designed to move.
Monitoring usually requires the target to stay.
If a surveyor attempts to recreate a monitoring point manually using a portable prism every time, additional positioning variables may be introduced.
A fixed prism provides the opposite workflow:
Install Once → Observe Repeatedly
This is the fundamental advantage of a dedicated monitoring target.
Monitoring Surface Movement
Prism-based total station measurements are particularly useful for monitoring positional changes at accessible surface or structural points.
Repeated observations can support evaluation of:
Horizontal displacement
Vertical positional change
3D coordinate change
Movement trends
The actual measurement performance depends on the complete survey system.
Can Monitoring Prisms Detect Ground Movement Underground?
Not directly.
A prism can only provide a target at the location where it is physically installed and visible to the total station.
Subsurface movement may require other geotechnical instrumentation.
Tunnel monitoring projects may therefore combine several methods depending on the monitoring objectives.
Monitoring Prism vs Inclinometer
These instruments serve different purposes.
Monitoring Prism + Total Station
Provides positional information for selected visible monitoring points.
Inclinometer
Can be used for monitoring lateral deformation along an installed borehole or structural profile, depending on the system.
They should not be considered direct substitutes.
A project may use both.
Monitoring Prism vs Settlement Monitoring
Where precise vertical settlement is the primary concern, dedicated levelling techniques or other appropriate instrumentation may also be required.
A total station prism system can provide coordinate information, but the selected methodology should meet the project's accuracy requirements.
X/Y Direction Adjustment
Tunnel and underground projects can create complicated observation geometry.
The mounting surface may not face directly toward the total station.
The Myzox TK-10S / TK-10 provides X/Y directional adjustment, allowing the prism orientation to be adjusted during installation.
Why the -25 mm Prism Constant Matters
The Myzox TK-10S / TK-10 has a specified:
Prism Constant: -25 mm
The appropriate setting should be configured in the total station according to the instrument manufacturer's procedures.
If different prism types are used across a large monitoring project, each target type should be clearly documented.
High Visibility on Busy Infrastructure Sites
Tunnel and underground projects can contain large amounts of:
Machinery
Temporary structures
Scaffolding
Safety barriers
Construction materials
Survey targets
The TK-10S high-visibility configuration can help survey teams identify the installed monitoring target.
Each prism should still have a unique monitoring point ID.
Protecting Monitoring Targets
Fixed targets can remain installed for extended periods.
They should be protected from:
Accidental impact
Construction machinery
Demolition work
Scaffolding changes
Temporary structures
Unauthorised removal
Targets should be inspected whenever an unusual measurement occurs.
Line of Sight Can Change During Tunnel Projects
A target that is visible during baseline measurement may later become obstructed.
Possible causes include:
Hoarding
Cranes
New structures
Equipment
Safety netting
Temporary works
Monitoring point planning should therefore consider future construction stages where possible.
Manual Tunnel Monitoring
For lower-frequency monitoring, surveyors can periodically visit the site and observe fixed targets using a total station.
For example:
Baseline → Weekly Observation → Weekly Observation → Construction Stage Change → Additional Observation
The required frequency should follow project specifications.
Automated Tunnel Monitoring
Where higher-frequency observations are required, suitably configured robotic or monitoring total station systems may repeatedly observe predetermined prism targets.
An automated system may include:
Robotic monitoring total station
Fixed prisms
Stable reference targets
Monitoring software
Communication system
Data processing
Reporting or alert functions
The Myzox monitoring prism provides the optical target component, not the complete monitoring system.
Stable Reference Control Is Essential
Monitoring targets are measured relative to the survey reference network.
If the reference network moves, apparent target movement may be introduced.
A simplified monitoring relationship is:
Stable Reference Network → Total Station → Myzox Monitoring Prisms
Both sides must be considered when evaluating monitoring quality.
Total Station Calibration for Tunnel Monitoring
Repeated deformation observations require consistent surveying equipment performance.
MTM Precision provides total station calibration and surveying instrument service in Malaysia for professional construction, infrastructure and monitoring applications.
Who Uses Tunnel Monitoring Prisms?
Potential users include:
Engineering surveyors
Land surveyors
MRT contractors
Railway contractors
Tunnel contractors
Civil engineering companies
Geotechnical consultants
Structural consultants
Monitoring specialists
Infrastructure contractors
Myzox Tunnel Monitoring Prism Supplier Malaysia
MTM Precision supplies Myzox TK-10S / TK-10 Monitoring Prism L-Bar Type, total station accessories and professional surveying equipment in Malaysia.
The product can support suitable monitoring applications involving tunnels, underground stations, retaining structures, surrounding buildings and infrastructure projects.
Contact MTM Precision
MTM Precision Sdn. Bhd.
Myzox Authorized Distributor in Malaysia
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Website: www.mtmpre.com.my
Email: mtmpre@yahoo.com
WhatsApp: +6016-6607346
Contact MTM Precision for Myzox TK-10S / TK-10 Monitoring Prism price, project quantity quotation, availability and tunnel or underground construction monitoring enquiries in Malaysia.
18 Aug 2026
