Recommendation for the Sizes for each Type of Road Making Machinery to Cater to the General Demand of Road Works
1980 Edition

Overview and Essential Guidelines (IRC SP 22)

IRC SP 22 offers recommendations on equipment selection for road construction and maintenance projects.

Highlights from the Overview:

• Focuses on choosing the correct type and size of machinery aligned with task requirements.
• Factors such as soil characteristics, project magnitude, productivity, and cost-efficiency are considered.
• Stresses matching equipment capacity with workload to enhance operational efficiency.

Key Equipment Selection Factors (Clause 2):

• Work Nature: Earthmoving, bituminous application, concrete activities.
• Soil and Material Properties: Hardness, moisture levels.
• Project Scale & Timeline: Larger endeavors justify larger machines.
• Output Rate: Volume handled per hour/day.
• Economic Aspects: Capital, operational, and maintenance costs.
• Equipment Availability and Site Accessibility.

Productivity Equation:

[ \text{Productivity} = \frac{\text{Work Volume}}{\text{Time Taken}} ]

Sample Equipment Capacity Table:

flowchart LR
    A[Project Needs] --> B{Choose Equipment}
    B --> C[Soil Type]
    B --> D[Work Volume]
    B --> E[Cost Analysis]
    B --> F[Availability]
    C --> G[Select Equipment Type]
    D --> G
    E --> G
    F --> G

Summary: IRC SP 22 promotes efficient machinery selection by integrating technical and financial considerations appropriate to project specifics.

Determinants for Selecting Equipment Type and Size (IRC SP 22)

Principal Considerations:

• Work Nature & Volume: Align equipment capacity with project size.
• Soil and Material Traits: Choose machinery suitable for soil type and material handling.
• Site Factors: Terrain, access, and space constraints affect machine size.
• Production Capacity: Equipment must meet output targets without undue downtime.
• Fuel Economy & Maintenance: Machines with efficient fuel use and ease of servicing are preferred.
• Availability & Budget: Local availability and financial constraints influence choices.

Suggested Equipment Size Examples:

Production Rate Formula:

[ \text{Production Rate} = \text{Bucket Volume} \times \frac{1}{\text{Cycle Time}} \times \text{Efficiency Factor} ] Where:

• Bucket Volume = volume per load (m³)
• Cycle Time = loading cycle duration (seconds)
• Efficiency Factor = typically 0.75 to 0.85 (accounts for delays)

flowchart LR
    A[Project Demands] --> B[Select Equipment Type]
    B --> C[Assess Site Conditions]
    C --> D[Decide Equipment Size]
    D --> E[Verify Production Rate]
    E --> F[Confirm Cost and Availability]
    F --> G[Finalize Equipment Choice]

Summary: Effective equipment selection balances project requirements, site conditions, and operational performance using IRC SP 22’s size recommendations and output calculations.

Site Preparation Including Jungle Clearance (Based on IRC SP 22)

Recommended Machinery and Sizes:

Additional Notes:

• Crawler tractors fitted with dozer blades are primarily used to clear trees, stumps, and undergrowth.
• Attachments such as rooters and stumpers facilitate stump and tree removal.
• Tipping truck size varies with terrain and hauling distance requirements.

Equipment Selection Flowchart

graph TD
    A[Site Preparation] --> B[Crawler Tractor]
    B --> B1[Light Clearance (90-120 HP)]
    B --> B2[Heavy Clearance (160-200 HP)]
    A --> C[Tipping Trucks]
    C --> C1[3 t (Hilly Terrain)]
    C --> C2[5-7.5 t (General Use)]
    C --> C3[10 t (Good Roads)]
    A --> D[Scrapers]
    D --> D1[Towed (13 m³)]
    D --> D2[Motorised (15-17 m³)]
    A --> E[Rollers & Graders]
    E

Summary: Proper site clearing and preparation use appropriately sized machinery according to terrain and project scale, ensuring efficient earthwork and groundwork.

IRC SP 22 Recommendations on Machinery Sizing for Road Work

While specific clauses are not fully detailed, typical guidelines suggest the following sizes:

Suggested Equipment Sizes

Key Points:

• Horsepower and capacity selections correspond with project size and soil conditions.
• Use vibratory rollers for granular soils; pneumatic rollers suit bituminous layers.

Example Compaction Energy Calculation:

[ \text{Compaction Energy} = \text{Static Weight} \times \text{Amplitude} \times \text{Frequency} ] Where amplitude and frequency depend on machine specifications.

graph LR
A[Road Work Requirements] --> B[Select Machinery Type]
B --> C{Match Capacity}
C -->|Small| D[Light Equipment]
C -->|Medium| E[Medium Equipment]
C -->|Large| F[Heavy Equipment]

This approach ensures equipment aligns with project demands consistent with IRC SP 22 guidance.

Soil Stabilization Machinery Highlights from IRC SP 22

1. Objective of Soil Stabilization

• Enhance soil properties by blending soil with stabilizing agents like cement, lime, or fly ash.
• Compaction must be done at optimum moisture content for effectiveness.

2. Recommended Equipment Sizes

3. Notes on Compaction Equipment

• Sheepfoot rollers (single or double drum) are suited for clayey soils.
• Earth and pneumatic rammers are recommended for restricted or shoulder areas.
• Water tankers with 3500-4500 litre capacity provide essential moisture during compaction.

4. Additional Observations

• Rotillors with 1.25 m width and 200 mm depth are used for scarifying and pulverizing soil.
• Mechanized equipment enhances quality and speed in bituminous and soil stabilization works.

Soil Stabilization Equipment Flowchart

flowchart TD
    A[Soil Stabilization] --> B[Mixing with Stabilizing Agents]
    B --> C[Compaction with Recommended Equipment]

Specifications and Sizes for Soil Compaction Equipment (IRC SP 22)

• Sheepfoot Rollers: Single or double drum types for compacting clay soils.
• Static Rollers: Conventional 3-wheeled or tandem rollers weighing 8-10 tonnes, suitable for earthwork, sub-base, base, and bituminous layers.
• Vibratory Rollers: Machines approximately 4 tonnes in weight.
• Tractamount Rollers: Around 8 tonnes capacity.
• Earth Rammers and Pneumatic Rammers: Utilized for compacting shoulders and hard-to-reach zones.
• Water Tankers: Truck or trailer-mounted tanks with 3500-4500 litres capacity for moisture supply during compaction.
• Hot Mix Plants: Capacities ranging from 6-10, 20-30, to 30-45 tonnes per hour.
• Paver-Finishers: Suitable for laying 45-75 tonnes per hour.
• Bitumen Boilers: Capacity of 1000-1500 litres for on-site bitumen heating.

Summary of Recommended Sizes:

Important Notes:

• Sheepfoot rollers are preferred for clayey soil compaction.
• Water application is critical to achieve proper compaction and consolidation.
• Earth rammers are used where heavy rollers cannot operate effectively.
• Equipment size selection depends on terrain, project scale, and soil classification.

graph LR
A[Soil Classification] --> B{Is Clayey?}
B -->|Yes| C[Use Sheepfoot Roller]
B -->|No| D[Use Static Roller (8-10t)]
D --> E[Vibratory Roller (4t)]
D --> F[Tractamount Roller (8t)]
G[Restricted Area] --> H[Earth/Pneumatic Rammers]

Summary of Bituminous Work Equipment per IRC SP 22

Key Machines and Their Recommended Capacities:

Notes:

• Hot mix plant capacity should correspond to project size.
• Water tankers ensure adequate moisture during compaction.
• Sheepfoot rollers are essential for clayey soils.
• Paver finisher capacity should align with hot mix plant output for smooth laying.

Equipment Capacity Summary Table

flowchart LR
    A[Hot Mix Plant] --> B[Paver Finisher]
    B --> C[Bituminous Layer]
    D[Bitumen Boiler] --> B
    E[Bulk Bitumen Truck] --> D

Rock Excavation and Quarrying Equipment Details (IRC SP 22 - Clause 4.5)

• Air Compressors for Jackhammers:

  • Initial hill road construction: 3 to 4.5 m³/min capacity for one jackhammer.
  • Subsequent development: 6 to 10 m³/min for two jackhammers.
  • Note: Pipeline length affects air pressure and losses, so capacity selection must consider this.

• Stone Crushers:

  Jaw Opening (mm)	Capacity (tonnes/hr)	Application
  400 x 225	14 - 18	Aggregate production
  400 x 250	14 - 18	Aggregate production

• Granulators:

  Jaw Opening (mm)	Capacity (tonnes/hr)	Application
  300 x 175	5 - 8	Smaller aggregate sizes
  300 x 100	5 - 8	Smaller aggregate sizes

Summary Table:

Note: Equipment size should match project scale and site conditions, considering transport and air loss factors.

flowchart LR
    A[Air Compressor] -->|3-4.5 m³/min| B[Single Jackhammer]
    A -->|6-10 m³/min| C[Double Jackhammers]
    D[Stone Crusher] -->|400x225 or 400x250 mm| E[14-18 t/hr Aggregate]
    F[Granulator] -->|300x175 or 300x100 mm| G[5-8 t/hr Aggregate]

Specifications for Material Haulage Equipment (IRC SP 22, Clause 7.5):

• Tipping Truck Capacities by Terrain:

  • 3 tonnes: Ideal for hilly areas, sharp turns, and smaller loads.
  • 5 tonnes and 7.5 tonnes: Suitable for general earth and material transport.
  • 10 tonnes: Best for well-maintained roads and large volume haulage.

• Recommended Engine Power for Tipping Trucks: Approximately 110 to 125 horsepower drawbar power.

Recommended Machinery Sizes for Road Construction

Additional Notes:

• For earthworks involving lifts greater than 3 m or long haul distances, heavy earthmoving machinery is recommended.
• Use larger tipping trucks (10 tonnes) on good roads for higher efficiency.
• Smaller trucks (3 tonnes) are preferred in hilly terrain for better maneuverability.

flowchart LR
    A[Material Haulage] --> B{Terrain Type}
    B -->|Hilly Terrain| C[3 tonnes tipping trucks]
    B -->|General Terrain| D[5 & 7.5 tonnes tipping trucks]
    B -->|Good Roads & Large Load| E[10 tonnes tipping trucks]

This framework aligns with IRC SP 22 for effective haulage operations.

Operation and Maintenance Aspects According to IRC SP 22

Though detailed formulas or tables are not explicitly provided, the standard highlights:

1. Operational and Maintenance Facilities Needed

• Skilled operators and maintenance personnel.
• Access to necessary tools and spare parts.
• Proper workshops and storage areas.
• Scheduled inspections and servicing routines.

2. Equipment Selection Based on Site Conditions and Power Needs:

3. General Maintenance Recommendations

• Routine lubrication and cleaning.
• Monitoring engine and machine performance.
• Timely replacement of worn components.
• Training operators for efficient and careful equipment use.

flowchart TD
    A[Site Preparation] --> B[Select Machine Type]
    B --> C[Determine Required DBHP]
    C --> D[Set up Operation Facilities]
    D --> E[Schedule Maintenance]
    E --> F[Train Personnel]

Summary: Matching machine power to site conditions, maintaining skilled teams, and adhering to maintenance schedules optimizes equipment efficiency and lifespan.

Benefits of Standardizing Road Construction Machinery (IRC SP 22)

Standardization in road-building equipment offers multiple advantages:

• Simplified Operation and Maintenance: Standard machinery eases training, operation, and servicing, reducing downtime and costs.
• Uniform Manufacturing: Fixed sizes and specs ensure parts interchangeability and consistent quality.
• Supports Mechanization: Enables rapid mechanization to meet large-scale construction demands efficiently.
• Optimizes Labor and Resources: Helps manage labor fluctuations and adverse weather by reliable machine deployment.
• Enhances Quality and Speed: Standardized equipment improves construction quality and accelerates project completion.

flowchart LR
    A[Standardization] --> B[Uniform Equipment Sizes]
    B --> C[Interchangeable Parts]
    B --> D[Consistent Quality]
    A --> E[Streamlined Operation & Maintenance]
    A --> F[Facilitates Mechanization]
    F --> G[Improved Construction Speed & Quality]
    A --> H[Better Labor and Resource Management]

This framework supports efficient and sustainable road construction scaling.

Equipment Size Recommendations and Tables (IRC SP 22)

Key Equipment Sizes and Capacities

Notes:

• These sizes serve as general recommendations and may vary with terrain, mechanization levels, and production needs.
• Tipping truck capacities should be selected based on terrain and haulage requirements.
• Continuous evaluation and adjustment of equipment sizes are encouraged.

flowchart TD
    A[Road Construction Equipment] --> B[Crawler Tractors]
    A --> C[Tipping Trucks]
    A --> D[Scrapers]
    A --> E[Rollers]
    A --> F[Water Tankers]
    A --> G[Hot Mix Plants]
    B --> B1[90-120 HP (Light Jungle)]
    B --> B2[160-200 HP (Heavy Jungle)]
    C --> C1[3 t (Hilly Terrain)]
    C --> C2[5 & 7.5 t (General Use)]
    C --> C3[10 t (Good Roads)]
    D