Code of practice for stacking and packing stone slabs for transportation

IS 8348: Scope & Key Specifications

• Scope: Covers specifications for natural stone slabs used in construction, including mass, dimensions, and quality requirements.

Key Formula & Table for Stone Slab Mass (Clause 4.1)

• Note: For marble slabs, increase mass by 25%.

Rounding Off (Clause 0.3)

• Final values (observed/calculated) must be rounded per IS:2-1960.
• Retain the same significant figures as specified values.

Related IS Codes for Testing & Properties

• IS 1121 (Parts I-IV): Strength tests (compressive, tensile, shear)
• IS 1124: Water absorption & porosity
• IS 1127: Dimensions & workmanship
• IS 3316: Structural granite
• IS 3622: Sandstone slabs for flooring

flowchart LR
  A[Stone Slab Thickness] --> B[Mass per m² from Table]
  B --> C{Is Marble?}
  C -- Yes --> D[Mass × 1.25]
  C -- No --> E[Mass as per Table]

This summarizes the scope and key data for stone slabs under IS 8348.

IS 8348: Stacking and Packing in Wagons - Key Points

• Scope (Clause 1.1): Covers methods for stacking and packing stone/marble slabs in railway wagons or trucks.

• Stacking Pattern (Clause 2.2):

  • Rows are laid parallel to wagon width.
  • Start from both sides of the wagon, progressing towards the center.
  • Packing material is applied at the center to secure slabs.

• Stacking Method (Clause 3.1):

  • Stacking in trucks follows the same procedure as wagons, except for specific exceptions in Clause 3.2.

General Specifications for Stacking & Packing:

Summary Diagram:

flowchart LR
    A[Start stacking at wagon sides] --> B[Lay rows parallel to wagon width]
    B --> C[Move towards wagon center]
    C --> D[Apply packing material at center]
    D --> E[Secure slabs for transport]

This ensures slabs are stable, protected, and efficiently packed for transportation.

IS 8348: Stacking Orientation for Stone Slabs

Key Specifications:

• Stacking Direction (Clause 2.1):

  • Slabs are stacked vertically, either widthwise or lengthwise.
  • Preferred stacking follows Clause 2.1.1 convention.
  • For slabs < 2.0 m length (Clause 2.1.3), stack along the length to minimize gaps caused by weight restrictions.

• Stacking in Trucks (Clause 2.8.1):

  • Slabs must be packed to prevent movement and damage.
  • Vertical stacking is maintained, ensuring stability during transport.

Practical Guidelines:

Additional Notes:

• Maintain vertical stacking to avoid bending stresses.
• Use appropriate padding between slabs.
• Ensure uniform weight distribution.

flowchart LR
    A[Slab Length ≥ 2.0m] --> B[Stack Widthwise or Lengthwise]
    A --> C[Prefer Widthwise]
    D[Slab Length < 2.0m] --> E[Stack Lengthwise]
    E --> F[Reduce gaps in stacking]

This approach ensures safe and efficient stacking during transport per IS 8348.

IS 8348: Row Arrangement in Wagons – Key Points & Specifications

• Row Orientation (Clause 2.2):
  Rows are laid parallel to the wagon width, starting from both sides towards the center.

• Loading Sequence (Clause 2.3):
  Rows begin simultaneously from both ends and finish at the center, ensuring balanced loading.

• Space Utilization (Clause 2.7):
  Minimize the space between adjacent rows to maximize wagon capacity.

• Piece Combination (Clause 2.5.1):
  Select a mix of longer and smaller pieces in one layer to achieve the required loading capacity efficiently.

Practical Tips & Formula:

• Effective Wagon Width (W):
  ( W = n \times w_r + (n-1) \times s )
  Where:

  • ( n ) = number of rows
  • ( w_r ) = width of one row (piece width)
  • ( s ) = spacing between rows (minimized as per Clause 2.7)

• Goal: Choose ( n ) and arrange pieces so that ( W \leq ) wagon width.

flowchart LR
    A[Start Loading] --> B[Place Rows from Both Sides]
    B --> C[Minimize Space Between Rows]
    C --> D[Finish Rows at Center]
    D --> E[Check Loading Capacity]
    E -->|Capacity Met| F[Complete Layer]
    E -->|Capacity Not Met| B

This ensures balanced, space-efficient loading per IS 8348.

IS 8348: Central Row Placement Key Points

• Central Rows (Clause 2.4):

  • Stones laid vertically along their length regardless of length limits.
  • Minimizes gaps between adjacent rows.
  • Ensures slab weight stays within wagon loading capacity.

• Row Orientation (Clause 2.2):

  • Rows laid parallel to wagon width.
  • Start from sides, end at center where packing is applied.

• Spacing (Clause 2.7):

  • Minimize space between rows to maximize wagon capacity.

Summary Table for Central Row Placement

Purpose

• Vertical placement in central rows increases load-bearing capacity.
• Minimizes gaps, improving space utilization and stability during transport.

flowchart LR
    A[Start from Wagon Sides] --> B[Rows Laid Parallel to Width]
    B --> C[Central Rows: Stones Vertical on Length]
    C --> D[Packing Applied at Center]
    D --> E[Minimal Gaps Between Rows]
    E --> F[Maximize Loading Capacity & Stability]

This arrangement ensures efficient use of wagon space and safe transport as per IS 8348.

IS 8348: Layer Composition & Size Selection for Stone Slabs

Key Specifications:

• Layering (Clause 2.5):
  Multiple layers of stone slab rows may be used depending on:

  • Loading capacity of the transport (wagon/truck)
  • Sizes of slabs in each layer

• Row Laying (Clause 2.4 & 2.8):

  • Central rows: stones laid vertically on length to minimize gaps and optimize weight distribution.
  • Each row follows specific laying instructions (Clause 2.8.1).

Mass of Stone Slabs (Clause 4.1):

• Note: For marble slabs, increase mass by 25%.

Application:

• Calculate total slab mass per layer:
  [ \text{Total mass} = \text{Area} \times \text{Mass per m}^2 ]

• Determine number of slabs per wagon/truck using loading capacity and above mass.

Summary Diagram:

flowchart TD
    A[Select slab thickness] --> B[Find mass from table]
    B --> C{Marble slab?}
    C -- Yes --> D[Increase mass by 25%]
    C -- No --> E[Use mass as is]
    D --> F[Calculate total mass per layer]
    E --> F
    F --> G[Check loading capacity]
    G --> H{Capacity sufficient?}
    H -- Yes --> I[Decide number of layers]
    H -- No --> J[Reduce slabs or thickness]

References:

• IS 8348 Clause 2.4, 2.5, 2.8, 4.1
• IS 1121 series for stone strength properties (for detailed design)

IS 8348: Restrictions on Slab Positioning

• Stacking Orientation (Clause 2.1):
  Slabs are stacked vertically either widthwise or lengthwise to optimize stability and weight distribution.

• Small Length Slabs (≤ 2.0 m) (Clause 2.1.1 & 2.1.3):

  • Slabs up to 2.0 m length are stacked widthwise during dispatch.
  • However, when stacking in rows, slabs less than 2.0 m are stacked lengthwise to minimize gaps between rows and reduce weight concentration.

• Central Rows (Clause 2.4):
  Central rows always have slabs laid vertically on length, regardless of slab length, to keep weight within loading capacity and reduce gaps.

Summary Table:

Key Point:

• The orientation ensures weight per unit area remains within permissible loading limits, avoiding structural overload during transport or storage.

flowchart LR
    A[Slab Length ≤ 2.0 m] -->|Dispatch| B[Stack Widthwise]
    A -->|Stacking in Rows| C[Stack Lengthwise]
    D[Central Rows] --> E[Stack Lengthwise Vertically]
    B --> F[Ease of Handling]
    C --> G[Reduce gaps & weight concentration]
    E --> H[Maintain uniform weight distribution]

IS 8348: Stacking and Packing in Trucks - Key Points

• Scope: Covers stacking/packing of stone and marble slabs in trucks and railway wagons.
• Clause 2.8.1 & 3.1: Truck stacking follows wagon stacking methods with minor exceptions.

Key Specifications:

• Stacking Method:

  • Slabs are stacked vertically on edge, resting on wooden battens.
  • Use cushioning materials (e.g., jute, rubber) between slabs to prevent damage.
  • Maintain uniform slab thickness and alignment for stability.

• Packing:

  • Secure slabs with ropes or steel straps.
  • Use side supports and wedges to prevent slab movement.
  • Ensure weight distribution is even to avoid truck imbalance.

Typical Dimensions & Spacing:

Diagram of stacking in truck:

graph LR
A[Wooden Base] --> B[Vertical Slabs on Edge]
B --> C[Cushioning Material between Slabs]
C --> D[Side Supports & Wedges]
D --> E[Straps/Ropes for Securing]

Note: Refer to IS 8348 Clause 3.2 for truck-specific exceptions to wagon stacking.

IS 8348: General Stacking Method for Stone/Marble Slabs

Key Specifications:

• Stacking Orientation (Clause 2.1):

  • Slabs are stacked vertically, either widthwise or lengthwise.
  • For slabs < 2.0 m length, stack along the length to minimize gaps due to weight restrictions (Clause 2.1.3).

• Stacking in Trucks (Clause 2.8.1):

  • Slabs must be packed securely to prevent movement during transport.
  • Use appropriate cushioning and blocking to avoid damage.

General Guidelines:

Formula (For Weight Estimation):

[ \text{Weight of slab} = \text{Volume} \times \text{Density} ]

• Volume = Length × Width × Thickness
• Density (typical stone) ≈ 2600 to 2800 kg/m³

flowchart TD
    A[Start: Slab Dimensions] --> B{Length < 2m?}
    B -- Yes --> C[Stack Lengthwise]
    B -- No --> D[Stack Widthwise or Lengthwise]
    C --> E[Pack with cushioning]
    D --> E
    E --> F[Load in truck/wagon]
    F --> G[Secure to prevent movement]

Summary: Stack slabs vertically, orient slabs <2m lengthwise to reduce gaps, use cushioning, and secure slabs properly for transport.

IS 8348: Exceptions for Truck Loading (Clause 3.2)

• Truck stacking follows wagon stacking rules (Clause 3.1), except as per Clause 3.2.
• Key Exception: Trucks have limited space and different load distribution compared to wagons.

Key Specifications for Truck Loading:

Important Formula for Load Capacity per Layer:

[ \text{Load Capacity per Layer} = \sum (\text{Number of slabs} \times \text{Weight per slab}) ]

• Select slab sizes to meet the truck's load capacity in minimum layers.
• Ensure stacking does not exceed truck height or compromise safety.

flowchart LR
    A[Select slab sizes] --> B[Arrange slabs in one layer]
    B --> C{Load capacity met?}
    C -- Yes --> D[Proceed to next layer or finish]
    C -- No --> A

Summary: Truck loading prioritizes meeting load capacity within fewer layers, considering truck size and stability, differing from wagon stacking mainly in spatial constraints and load distribution.

Mass of Stone Slabs (IS 8348 - Clause 4.1)

The approximate mass per m² of stone slabs of various thicknesses is given below. For marble slabs, increase the values by 25%.

Usage Notes:

• Use these masses to calculate the number of slabs that can be loaded on a wagon or truck based on its capacity.
• Slabs are generally stacked starting from the cabin side to the end of the truck.
• For larger capacities, slabs may be laid flat towards the end of the truck for better packing.

Formula to calculate slab mass per slab:

[ \text{Mass of slab} = \text{Area of slab (m}^2) \times \text{Mass per m}^2 ]

For marble slabs:

[ \text{Mass}{marble} = \text{Mass}{normal} \times 1.25 ]

Related IS Standards for stone properties and testing:

• IS 1121 (Parts I-IV): Strength properties of natural stones
• IS 1124: Water absorption, specific gravity, porosity
• IS 1127: Dimensions and workmanship
• IS 1130: Marble blocks, slabs, and tiles
• IS 3622: Sandstone slabs for flooring
• IS 7779: Properties and availability of stones

flowchart LR
    A[Stone Slab Thickness (mm)] --> B[Mass per m² (kg)]
    B --> C[Calculate number of slabs per truck capacity]
    C --> D[Arrange slabs starting cabin side]
    D --> E[Lay slabs flat at truck end if capacity large]

This ensures safe and efficient transportation with minimal breakage.