In geotechnical engineering, how to choose single-fluid, double-fluid, or triple-fluid jet grouting rigs is a critical decision that determines construction quality and cost efficiency. With 20 years of technical expertise, I will systematically analyze the key considerations for how to choose single-fluid, double-fluid, or triple-fluid jet grouting rigs from three dimensions: ground conditions, project requirements, and cost-effectiveness.  

I. Selecting Single-Fluid, Double-Fluid, or Triple-Fluid Jet Grouting Rigs Based on Ground Conditions

1. Single-Fluid Process

(1) Suitable for: Soft soils (N-value < 15) such as silt and clay  

(2) Injection medium: Cement slurry only (20-30 MPa pressure)  

(3) When evaluating how to choose single-fluid, double-fluid, or triple-fluid jet grouting rigs, single-fluid is ideal for applications like cutoff walls where high strength is not required.  

2. Double-Fluid Process

(1) Suitable for: Medium-hard soils (N-value 15-30) such as sand and cohesive soil  

(2) Injection medium: Cement slurry + compressed air (0.5-0.7 MPa air pressure)  

(3) In determining how to choose single-fluid, double-fluid, or triple-fluid jet grouting rigs, the double-fluid method offers the best cost-performance balance for moderately hard formations.  

3. Triple-Fluid Process

(1) Suitable for: Hard formations (N-value > 30) such as gravelly sand and weathered rock  

(2) Injection medium: High-pressure water (30-50 MPa) + compressed air + cement slurry  

(3) When resolving how to choose single-fluid, double-fluid, or triple-fluid jet grouting rigs, the triple-fluid method is the only option for ultra-deep (>40 m) or large-diameter (>1.5 m) piles.  

II. Selecting Single-Fluid, Double-Fluid, or Triple-Fluid Jet Grouting Rigs Based on Project Requirements  

1. Waterproofing projects: Single-fluid can achieve permeability coefficients ≤10⁻⁶ cm/s.  

2. Foundation reinforcement: Double-fluid achieves unconfined compressive strength of 1.5-3 MPa.  

3. Special treatments: Triple-fluid forms high-strength consolidated masses (2.5-4 MPa) for tunnel face stabilization.   

When assessing how to choose single-fluid, double-fluid, or triple-fluid jet grouting rigs, key factors include design requirements for pile diameter, depth, and strength. For example:  

1. Cutoff walls (600 mm diameter): Prefer double-fluid.  

2. Bridge pile reinforcement (50 m depth): Must use triple-fluid.  

III. Selecting Single-Fluid, Double-Fluid, or Triple-Fluid Jet Grouting Rigs Based on Cost-Effectiveness

A cost comparison (for Φ800 mm piles):  

When deciding how to choose single-fluid, double-fluid, or triple-fluid jet grouting rigs:  

1. Budget-constrained, simple geology: Single-fluid.  

2. Moderate-difficulty projects with tight schedules: Double-fluid.  

3. Complex geology, high-standard projects: Triple-fluid (regardless of cost).  

IV. Practical Tips for Selecting Single-Fluid, Double-Fluid, or Triple-Fluid Jet Grouting Rigs  

1. Hybrid method: Use single-fluid for upper soft layers, switch to triple-fluid for deeper hard rock.  

2. Equipment modification: Adding a secondary cutting device to double-fluid rigs improves efficiency by 20%.  

3. Parameter optimization: Increasing water pressure from 40 MPa to 45 MPa in triple-fluid reduces grout consumption by 15%.  

Conclusion

Mastering how to choose single-fluid, double-fluid, or triple-fluid jet grouting rigs means understanding the technical logic: "single-fluid saves costs, double-fluid balances performance, and triple-fluid ensures quality." Keep this guide as a reference and make informed decisions by combining it with geotechnical survey reports!