Jet Grouting Rig Selection Mistakes: The “Savings” You See May Become Hidden Losses
For the same type of project, two jet grouting rigs with a price difference of nearly USD 10,000 may end up having completely opposite total project costs.
The difference is not shown on the quotation sheet — it is hidden outside the machine itself.
Many buyers focus only on the initial purchase price when selecting a jet grouting rig. However, the factors that truly determine project profitability are equipment completeness, simplified construction processes, and actual productive working hours.
This article analyzes the hidden costs often overlooked during jet grouting rig selection, including equipment investment, additional procedures, downtime, and long-term asset value.
1. A Cheaper Bare Machine May Cost More After Delivery
Jet grouting construction cannot be completed with only the main drilling rig.
Drill tools, adapters, auxiliary equipment, lifting accessories, and other supporting components are all essential. Any missing item means additional procurement, rental, or outsourcing costs on site.
Common hidden expenses include:
• Adapter Costs
If the rig is not equipped with a hydraulic chuck and large through-hole rotary head as standard, drill rod replacement may require additional adapters.
A single adapter may cost thousands of yuan, and as consumable components, repeated replacement during a project can create significant additional expenses.
• Pre-drilling Equipment Costs
If the jet grouting rig lacks sufficient torque or drilling capability for the target formation, an additional pre-drilling machine may be required.
The costs include:
Equipment rental fees;
Mobilization and transportation costs;
Additional operators;
Extra maintenance and tooling consumption.
These costs are usually invisible in the initial equipment quotation.
• Waiting Time Costs
Incomplete equipment preparation can lead to construction delays.
Lost working windows, idle workers, and potential schedule penalties often cost far more than the original price difference between two machines.
Therefore, the correct comparison should not be the machine price alone, but the complete cost of achieving the required construction performance.
Taking the AM-6 Jet Grouting Version as an example, the rig comes standard with a detachable 10-meter auxiliary mast, hydraulic chuck, and large through-hole rotary head, eliminating the need for additional adapters during drill rod replacement.
The value of these configurations is not simply adding more items to the specification sheet. They directly reduce real project costs:
No adapter procurement or replacement cost during operation;
Complete mast and drilling tool package delivered with the machine;
Faster site preparation without waiting for external suppliers or rental equipment.
AM-6 Jet Grouting Version Product Page
AM-6 Rotary Jet Grouting Construction Site
2. One Additional Process Means One More Cost
“Pre-drilling before jet grouting” is often considered a standard procedure by many contractors. However, pre-drilling itself means additional costs: an extra machine mobilization, an additional crew, more drilling tool wear, and a longer construction schedule.
Whether this process can be eliminated depends on whether the ground conditions match the equipment capability:
Ground conditions: Soft soil and sand layers generally offer better drillability, making direct drilling more feasible. Dense gravel layers and hard interlayers may still require separate pre-drilling.
Torque capacity: Higher torque provides stronger direct drilling capability, especially in harder formations.
Hole diameter and depth: Larger diameters and deeper holes require higher torque and greater feed force.
Drilling tool selection: Reinforced jet grouting tools can provide significantly better cutting performance compared with standard tools.
Mud/cement slurry system: The stability of the slurry system directly affects borehole wall stability, which determines whether pre-drilling is required for temporary support.
When these conditions are properly matched, sufficient torque combined with reinforced drilling tools can enable an integrated pre-drilling and jet grouting process, eliminating the need for additional equipment and separate pre-drilling operations.
The AM-6 jet grouting version is equipped with a 7,000 N·m high-torque power head. Combined with reinforced jet grouting tools, it provides sufficient cutting performance and rotary power to complete drilling and grouting in a single operation under suitable conditions such as soft soil and sand layers, without requiring separate pre-drilling.
Eliminating this extra step is not only about saving the cost of one machine. It also reduces equipment coordination, lowers labor requirements, and removes another potential source of construction delays.
AM-6 Rotary Jet Grouting Construction Demonstration
3. Similar Specifications, Why Do Daily Productivity Levels Differ?
When comparing drilling rig specifications, buyers often focus on peak values such as maximum torque and maximum drilling depth.
However, actual daily production is determined by another important factor:
The percentage of effective drilling time.
A machine may operate for 10 hours per day, but how much time is actually spent drilling?
Every drill rod connection requires:
Stopping operation;
Pulling up the drill string;
Adding a new rod;
Connection inspection;
Restarting drilling.
Each connection represents non-drilling downtime.
For example, with standard 3-meter drill rods and a 15-meter drilling depth:
5 drill rods are required;
4 rod connection operations are needed.
Each connection may take approximately 3–5 minutes, including stopping, adding rods, and restarting.
The total connection downtime for one 15-meter hole can reach around 12–20 minutes.
If a project completes 10 holes per day with the same depth, accumulated connection downtime can reach:
120–200 minutes per day
That equals approximately 2–3.5 hours of pure productivity loss.
The result:
Effective drilling time decreases by 20%–35%;
Daily production capacity drops;
Cost per drilled meter increases.
The key point is:
Under suitable working conditions, reducing drill rod connection frequency directly improves effective drilling time.
The AM-6 Jet Grouting Version can be equipped with a counterweight and a 3-meter auxiliary mast.
For suitable applications, a 15-meter hole can be completed with one continuous drilling operation, reducing drill rod connections from 4 times to 0.
At the same time, its 70 kN lifting force, twice the 35 kN feed force, provides sufficient lifting capacity. Operators can complete rod handling with fewer adjustments, further reducing non-drilling time.
The result is simple:
Fewer rod connections + shorter downtime per connection = higher daily production.
For horizontal anchoring applications such as slope stabilization and tunnel sidewall reinforcement, equipment selection should also consider lifting capability and rotary head structure according to the specific working environment.
For anchoring applications, please refer to the AM-6 Anchor Version Product Page.
AM-6 Anchor Plate High-Lift Operation
4. A Drilling Rig Is Not Only Equipment — It Is a Recoverable Asset
The second-hand market activity and resale value of a jet grouting rig directly affect the real cost of ownership.
A machine with stronger market recognition and better resale value can significantly reduce the actual equipment cost allocated to each project.
The purchase price is only the beginning.
The final cost also depends on:
How much value can be recovered after the project is completed?
Therefore, during equipment selection, buyers should ask:
How much will this machine be worth three years later?
5. Equipment Selection Is Ultimately a Total Cost Calculation
Returning to the original question:
Why can a machine that costs nearly USD 10,000 more upfront create lower total project costs?
Because jet grouting rig selection should not be based only on purchase price.
The real comparison should be the total cost required to complete the same amount of work:
Total Cost of Ownership (TCO) =
Equipment purchase and supporting configuration costs
Additional process costs
Non-drilling downtime costs
Equipment scheduling and labor costs
Rework risk costs
After-sales service and delivery support
Resale value
These costs represent:
• Equipment and Supporting Costs
Compare the complete delivered solution, not only the bare machine price.
The more complete the configuration, the fewer additional purchases are required on site.
• Process Accumulation Cost
When ground conditions and equipment capabilities are properly matched, integrating pre-drilling and jet grouting into a single operation means one less construction step, one less machine mobilization, and one less potential source of schedule delays.
• Non-drilling Time Costs
Higher effective drilling time means higher daily production and lower cost per drilled meter.
• After-sales Service and Delivery Support
Equipment delivery is not the end of the project — it is the beginning.
Some suppliers disappear after shipment, leaving contractors to solve commissioning, operation training, and process adaptation problems themselves.
A supplier that provides equipment configuration recommendations, technical guidance, and on-site support can significantly reduce trial-and-error costs.
• Equipment Resale Value
The purchase price is only the starting point.
The resale value determines the final ownership cost.
Higher residual value means lower actual equipment cost over the project lifecycle.
Conclusion: Choose Based on Total Value, Not Initial Price
Jet grouting rig selection is essentially a cost calculation.
Once hidden costs from accessories, additional procedures, downtime, service, and resale value are fully considered, the real difference between “cheap” and “expensive” becomes clear.
For project-specific equipment selection, contact the Anman technical team. By providing your geological conditions and construction requirements, you can receive recommendations covering equipment configuration, application matching, and technical support.
→ Contact Anman for a customized jet grouting solution
