Small launch pits
Compact configurations allow tool selection around restricted excavation dimensions and limited installation space.
TERRA Piercing Tools – Mini Version
Compact piercing power for restricted working spaces.
TERRA-HAMMER Mini piercing tools bring pneumatic trenchless installation into smaller launch pits and confined working areas.
Designed for short underground utility crossings, these compact machines combine effective impact performance with practical handling and control.
Mini
Compact piercing tool configurations
6–7 bar
Published operating pressure
Up to 10 m
Manufacturer’s indicative mini bore length
45–105 mm
Diameters in supplied specification table
Short and compact
Designed for smaller launch pits and tight access.
Not every installation provides enough room for a full-length pneumatic piercing tool.
TERRA developed its Mini configurations for applications where the available launch length is restricted, including manholes and confined working spaces.
The manufacturer describes Mini piercing tools as suitable for short bores of up to approximately 10 metres. Actual suitability depends on the ground, tool and installation conditions.
Despite their compact format, Mini versions retain TERRA-HAMMER’s pneumatic impact principle and application-focused design.
Typical applications
Ideal where working space is limited.
The shorter tool format can make pneumatic piercing possible in locations where launching a longer machine would be difficult.
Manholes and confined access
Mini piercing tools can support suitable operations where working dimensions restrict the use of longer equipment.
Short utility crossings
Install appropriate service pipes and ducts beneath footpaths, driveways and other obstacles without a continuous open trench.
TERRA-HAMMER engineering
Small tool. Proven engineering principles.
TERRA’s published Mini information highlights the same important features associated with its wider pneumatic piercing range. The exact features available depend on the selected model.
KOK combi-head
The combi-head uses shaped cutting geometry to assist soil displacement and penetration through suitable ground conditions.
Heavy main piston
TERRA attributes its effective impact performance partly to the hollow-head construction, which allows the use of a heavier main piston.
Reduced working length
Shorter configurations make it easier to plan suitable launch arrangements in confined excavation and access areas.
Quick reversing
Version S uses a quarter-turn air-hose reversing arrangement. Confirm the operating system provided with the selected Mini model.
Practical construction
TERRA’s construction philosophy focuses on impact efficiency and practical servicing. Maintenance procedures depend on the individual machine configuration.
Main-piston warranty
Manufacturer information references a three-year main-piston warranty. Applicable terms and model eligibility should be confirmed before supply.
Reversing and control
Understanding TERRA’s reversing arrangements.
TERRA’s piercing tool range includes different methods of controlling reverse movement. These should not be assumed interchangeable between models.
Quick reverse
Version S uses a quarter-turn of the air hose to activate the reversing system.
The manufacturer also describes pneumatic locking intended to reduce unintended reversing during operation.
Remote-control reverse
TERRA also manufactures remote-control reversing configurations operated using designated controls.
This is a feature of the wider TERRA-HAMMER family; availability for an individual Mini model must be checked separately.
Technical data
TERRA-HAMMER Mini specifications.
The following model information is taken from the manufacturer specification table supplied for the Mini piercing tool range.
| Model | Diameter | Length | Weight | Frequency | Air use | Pressure |
|---|---|---|---|---|---|---|
| TU 045 R (mini) | 45 mm | 1.00 m | 9 kg | 475/min | 0.6 m³/min | 6–7 bar |
| TU 055 R (mini) | 55 mm | 1.05 m | 13 kg | 520/min | 0.9 m³/min | 6–7 bar |
| TU 068 SK (mini) | 68 mm | 0.98 m | 20 kg | 480/min | 1.1 m³/min | 6–7 bar |
| TU 080 SK (mini) | 80 mm | 0.91 m | 24 kg | 550/min | 1.8 m³/min | 6–7 bar |
| TU 090 SK (mini) | 90 mm | 0.91 m | 38 kg | 550/min | 1.8 m³/min | 6–7 bar |
| T 105 S (mini) | 105 mm | 1.08 m | 44 kg | 540/min | 2.4 m³/min | 6–7 bar |
Important specification notes:
The manufacturer describes
the Mini range as 55–105 mm
in its introductory material,
although the supplied technical
table also lists the 45 mm
TU 045 R (mini).
The introductory material
additionally references
lengths as short as 880 mm,
whereas the six configurations
in this particular table
measure 0.91–1.08 m.
Confirm current dimensions,
availability and the exact
machine configuration
with TA Drilling.
Specifications may change
without prior notice.
Understanding the range
What do the model letters mean?
TERRA uses letter combinations to identify construction and reversing arrangements across its pneumatic piercing range.
T
TERRA-HAMMER with a fixed earth-displacement head.
TU
TERRA-HAMMER with interchangeable head adapters.
S
Quick reverse using a quarter-turn of the air hose.
F
Remote-controlled reversing function.
K
Serviceable construction without the need for heating during servicing.
SK
Combination of Version S and Version K features.
Equipment selection
Match the Mini Mole to the working conditions.
Compact tools are useful where space is restricted, but the correct diameter, operating requirements and ground suitability remain essential.
TA Drilling can help review the application before specifying the equipment.
✓
Pipe or duct outside diameter
✓
Crossing length and alignment
✓
Ground conditions and obstructions
✓
Launch and reception pit dimensions
✓
Compressor pressure and airflow
✓
Reversing and accessory requirements
Which Mini Mole suits your job?
Send us the proposed installation diameter, crossing distance, ground conditions and available launch dimensions.
We can help identify the appropriate TERRA-HAMMER model, compressor requirements and compatible accessories.
Speak to TA Drilling
TERRA support in the UK
Short on space? Let’s find the right Mini Mole.
From confined launch pits and short crossings to tool diameter and compressed air requirements, TA Drilling can help you select an appropriate Mini piercing tool configuration.
Enquire with TA Drilling