bamboo tent poles

IS 7344 Scope & Key Specifications Summary

• Scope: IS 7344 covers specifications for bamboo poles used in structural applications, focusing on dimensions, tolerances, fittings, and preservation.

Key Dimensions & Tolerances (mm)

Fittings

• Caps: Welded all-round cap at thin end (shell thickness min 5 or 10 mm depending on pole).
• Loops & Bands: Loop and band fitted on one end or both ends depending on pole number.
• Rivets: 5 mm diameter MS rivets used for fittings; holes drilled accordingly.

Preservation

• Poles to be cut immediately below the node.
• Shell thickness at thin end minimum 5-12.5 mm depending on pole size.
• Rivets flush-riveted at both ends.

Typical Pole Section (Mermaid Diagram)

graph TD
    A[Thick End] -->|Length B| B[Middle Section]
    B -->|Length C| C[Thin End]
    C -->|Cap/Loop Fittings| D[Fittings]
    D -->|Rivets| E[Rivets 5mm dia]

Notes:

• Tolerances ±10 to ±20 mm on lengths.
• Shell thickness

IS 7344 - Key Definitions & Specifications Summary

Clause 2.0: Definitions

• Defines terms related to poles, fittings, accessories, and preservation methods used in the standard.

Pole Dimensions & Specifications (Clause 12.5)

Fittings & Accessories

• Rivets: 5 mm diameter holes for MS rivets.
• Caps: Projection ~38 mm for caps on poles.
• Loops & Bands: Projection ~50 mm for loop and band fittings.
• Shell Thickness: Minimum 5 mm at thin ends; varies with pole size.
• Socket: Used on standing poles for connections.
• Spike & Cross Pin: Used for securing fittings.

Preservation

• Poles to be cut immediately below the node.
• MS pin riveted flush at both ends (3 mm pins).
• Line cotton wrapping specified by circumference and length.

Important Notes

• Dimensions in mm.

IS 7344: Materials - Key Specifications & Tables

1. Material Specifications:

• Mild Steel (MS): Rust-free mild steel used for metal components (Clause 3.2).
• Rivets: MS rivets, 3 mm or 5 mm diameter, rivetted flush at both ends.
• Shell Thickness: Varies by pole number, minimum thickness ranges from 5 mm to 12.5 mm depending on pole size.

2. Pole Dimensions & Shell Thickness (Selected from Table):

3. Rivet Hole Details:

• Hole diameter for rivets: 3 mm or 5 mm as per pole and accessory.
• Holes are countersunk (CSK) at both ends for flush riveting.

4. Accessories & Fittings:

• Caps, loops, bands fitted at pole ends with projections:
  • Cap projection: 38 mm
  • Loop and band projection: 50 mm
• Bands and loops are MS strengthening bands, riveted with 5 mm rivets.

5. Tolerances:

• Normal manufacturing tolerances apply where not specified (Clause 5.2).

Summary Diagram of Pole Components:

graph TD
    A[Main Pole Shell] --> B[Top End Diameter & Thickness]
    B --> C[MS Rivet Holes (3 or 5 mm)]
    A --> D[Socket & Band Fittings]
    D --> E[Loop & Band (Projection 50 mm)]
    D

IS 7344: Key Design & Construction Specifications

1. Pole Dimensions & Details (Clause 12.5, Figures 1-3)

2. Preservation Treatment (Clause 8.1)

• Cleaning: Remove rust and foreign matter from poles & metal parts.
• Bamboo with cavity ≤ 15 mm:
  • Immerse in creosote oil (IS:218 Type II) for 18h at room temp OR
  • Hot creosote (~90°C) immersion for 30 min + room temp immersion for 30 min.
• Bamboo with cavity > 15 mm:
  • Drill 6 mm holes 13 mm below each node on one side.
  • Inject creosote oil using syringe, plug holes, invert & cure vertically for 48h.

3. Fittings & Accessories

• Rivets: MS rivet diameter 3 mm (wall poles), 5 mm (ridge poles).
• Bands, loops, caps fitted as per pole type (see Clause 12.5).
• Shell thickness at top and thin ends maintained minimum 5 mm to 12.5 mm depending on pole.

Summary Table: Pole Shell Thickness & Rivet Sizes

| Pole Type | Shell Thickness (mm) | Rivet Dia (mm) | Top Diameter (mm) | |----------------|----------------------|----------------

IS 7344: Dimensions and Tolerances Summary

1. Dimensions (Clause 5.1)

• Poles must conform to dimensions shown in Fig. 1, 2, and 3 (refer to IS 7344 for detailed drawings).
• Typical pole dimension examples (in mm):

2. Tolerances (Clause 5.2)

• Where not specified in Figures 1, 2, 3, normal manufacturing tolerances apply.
• Typical tolerance range: ±10 mm or as per manufacturing capability.

3. Accessories and Details

• Cross Pins: 6 mm diameter mild steel rounds (Clause 4.11).
• Rivets: 5 mm diameter holes for rivets to suit pole and band.
• Shell Thickness: Minimum 5 mm at thin end (Clause 12.5).
• Fittings: Caps, loops, bands as per pole number with specified projections (38 mm or 50 mm).

Quick Reference Table for Tolerances and Dimensions

IS 7344: Workmanship and Finish - Key Points

1. Workmanship (Clause 6.1)

• Nodal portions of bamboo: Must be smoothly finished.
• Metal components: Free from sharp edges, cracks, burrs.
• Welding: Clean, continuous, sound.
• Fittings: Properly fitted; rivet ends snapped smoothly.
• Loops and caps: Eyes properly made and smoothly finished.

2. Tolerances (Clause 5.2)

• Normal manufacturing tolerances apply where not specified in Figures 1, 2, 3.

3. Specifications for Poles and Fittings (from Tables & Figures)

• Shell thickness: Minimum 5 mm at thin end (typically 12.5 mm diameter).
• Rivet holes: 5 mm diameter for rivets.

4. Preservation (Clause 8.1)

• Clean poles & metal parts before treatment.
• Cavity ≤ 15 mm: Immersion in creosote oil (Type II IS 218) for 18h at room temp or hot (90℃) for 30 min + room temp 30 min.
• Cavity > 15 mm: Drill 6 mm holes 13 mm below nodes, inject creosote oil, plug holes, invert poles vertically for 48h.

Summary Diagram of Workmanship & Finish

flowchart TD
    A[Bamboo Pole] --> B[Nodal Portions Smooth Finish]
    A --> C[Metal Components]
    C --> D[No sharp edges/cracks/burrs

IS 7344: Permissible Defects in Bamboo Poles (Clause 7.1)

Key Points:

• Internode: The segment between two nodes in bamboo.
• Defects like dead skin and water marks are allowed only on limited internodes to ensure structural integrity.
• Depth limits (3 mm) ensure defects do not significantly weaken the pole.
• Cross pins must be 6 mm diameter mild steel rounds (Clause 4.11).

Additional Notes:

• Smooth finishing of nodal portions and metal parts is mandatory (Clause 6.1).
• Normal manufacturing tolerances apply where not specified (Clause 5.2).

flowchart TD
    A[Finished Bamboo Pole] --> B{Check Defects}
    B --> C[Dead skin ≤ 4 internodes]
    B --> D[Water marks ≤ 4 internodes]
    B --> E[Xylocopa holes ≤ 1 per pole]
    B --> F[Estigmina attack ≤ 3 mm depth]
    B --> G[Knife cuts/charring ≤ 3 mm depth]
    B --> H[Rasping ≤ 3 mm depth]
    C & D & E & F & G & H --> I[Acceptable for use]

This ensures poles meet quality and durability standards per IS 7344.

IS 7344 - Preservation Key Points

1. Quantity of Preservative (Creosote Oil) per Internode

[ \text{Quantity (cc)} = 16 \times L \times D \times T ]

• L = Average internode length (cm)
• D = Average diameter at bigger end (cm)
• T = Average shell thickness at bigger end (cm)

2. Preservation Methods

3. Permissible Defects in Finished Poles (Clause 7.1)

Summary Diagram of Preservation Process

flowchart TD
    A[Start: Bamboo Pole] --> B{Cavity Size ≤ 15 mm?}
    B -- Yes --> C[Complete Immersion in Creosote Oil]
    C --> D[18 hrs at Room Temp OR 30 min Hot + 30 min Room Temp]
    B -- No --> E[Drill 6 mm Holes 13 mm Below Nodes]
    E --> F[Inject Creosote Oil via Syringe]
   

IS 7344: Marking and Certification Key Points

1. Marking Requirements (Clause 9.1)

Each pole or both halves of a jointed pole shall be legibly and indelibly marked with:

• Supplier's name/initials/trade-mark
• Year of supply
• Type and number of the pole

2. BIS Certification Marking (Clause 9.2 & 9.2.1)

• Use of the Standard Mark follows the BIS Act, 1986 provisions.
• Licence conditions for Standard Mark use are available from the Bureau of Indian Standards.
• Contact details for BIS headquarters, regional, and branch offices are provided for certification queries.

3. Preservation and Fittings (Clause 12.5)

• Caps, loops, bands, and rivets details are specified for pole accessories.

Summary Diagram of Marking & Certification Process

flowchart TD
    A[Manufacture Pole] --> B[Mark Pole with Supplier Info]
    B --> C[Apply Year & Type Number]
    C --> D[Apply BIS Standard Mark (if licensed)]
    D --> E[Certification by BIS]
    E --> F[Distribution & Use]

For detailed certification and marking license, contact BIS regional offices as per Clause 9.2.1.

IS 7344: Accessories and Fittings for Poles – Key Specifications

Material & Dimensions

• MS Sheet Thickness: 1.6 mm for accessories.
• Rivet Hole Diameter: 5 mm for MS rivets.
• Shell Thickness (Thin Ends): Minimum 10 mm (Standing & Ridge Poles), 5 mm for some poles (e.g., Pole No. 4 thin end 45 ± 5 mm dia).
• Thin End Diameter: Typically 75 ± 10 mm for Standing Poles; 40 mm dia for some ridge poles.

Accessories Details (Summary)

Preservation & Fitting Lengths (Clause 12.5 Table Extract)

• Loop and band length: ~1525 mm (Pole 4 & 6), ~1675 mm (Pole 5).
• Cap fitting projection: 38 mm.
• Loop & band fitting projection: 50 mm.

Riveting & Hole Details

• Holes drilled for 5 mm rivets to suit bands.
• Rivets used: 5 mm dia MS rivets, boss head type.

Visual Concept: Pole Accessory Assembly

graph LR
A[Pole Thin End] --> B[MS Band]
B --> C[5 mm Rivet Holes]
C --> D[Loop or Cap Fitting]
D --> E[Line Cotton Secured]

Summary: Use 1.6 mm thick MS sheets for bands, 5 mm rivets, and maintain specified diameters and tolerances. Accessories include caps, loops, and bands, fitted as per pole number with specified projections and lengths. Always follow dimensions in F

IS 7344: Assembly and Securing Methods Key Points

1. Cutting & Riveting (Clause 12.5)

• Cut immediately below the node.
• Use 3 mm MS pin rivets, rivetted flush at both ends.
• Holes for rivets: 3 mm diameter, countersunk (CSK) at both ends.
• Rivet hole diameter: 5 mm for some fittings to suit pole diameter.

2. Pole Dimensions & Shell Thickness (Table Summary)

3. Accessories & Fittings

• Bands: Solid MS strengthening bands, spot welded.
• Sockets: MS sheet thickness 1.6 mm minimum.
• Spikes: MS round, 6 mm diameter, riveted with 5 mm rivets.
• Caps and Loops: Fitted as per pole number; projection allowances:
  • Cap projection: 38 mm
  • Loop and band projection: 50 mm

4. Rivet Details

• Rivet diameter: 3 mm or 5 mm depending on pole and accessory.
• Holes drilled to suit rivet diameter with countersinking for flush finish.

Summary Diagram of Assembly (Mermaid.js)

graph LR

Quality Control in IS 7344 (Corrosion Preventive Coatings)

Key Points from Clause 9.2.1:

• Use of BIS Standard Mark is regulated under the Bureau of Indian Standards Act, 1986.
• Manufacturers must comply with licensing conditions for Standard Mark usage.
• Quality control includes adherence to specifications for temporary corrosion preventive fluids, hard films, and solvent-deposited coatings.

Relevant Specifications & Tolerances

• Clause 5.2 (Tolerances):
  Normal manufacturing tolerances apply unless otherwise specified in Figures 1, 2, and 3 of the standard.

• Workmanship & Finish (Clause 6):
  The coating must be uniform, free from defects such as blisters, cracks, or pinholes.

Quality Control Checklist

• Material Certification: Confirm raw materials meet BIS standards.
• Dimensional Checks: Use specified tolerances (Clause 5.2).
• Visual Inspection: Uniform coating, no defects.
• Coating Thickness: Measure as per IS 7344 recommended methods.
• Adhesion Test: Ensure coating adheres properly to substrate.
• Corrosion Resistance: Conduct salt spray or equivalent tests.

BIS Certification Marking Table (Excerpt)

Summary Diagram: Quality Control Process

flowchart TD
    A[Raw Material Inspection] --> B[Manufacturing Process]
    B --> C[Dimensional & Visual Inspection]
    C --> D[Coating Thickness Measurement]
    D --> E[Adhesion & Corrosion Tests]
    E --> F{Pass?}
    F -- Yes --> G[Apply BIS Mark & Dispatch]
    F -- No --> H[Rework/Reject]

For detailed conditions and licensing, contact BIS offices listed in the standard.

IS 7344: Storage and Handling - Key Specifications & Preservation

Preservation of Bamboo Poles (Clause 8.1)

• Cleaning: Remove rust/foreign matter before treatment.
• Cavity ≤ 15 mm:
  • Immerse in creosote oil (Type II IS:218) for 18 hours at room temp
  • OR hot creosote (~90°C) for 30 min + 30 min immersion at room temp
• Cavity > 15 mm:
  • Drill 6 mm holes 13 mm below nodes on one side in a line.
  • Inject creosote oil at room temp using syringe.
  • Plug holes, invert poles, roll down slope, then store vertically for 48 hours.

Pole Dimensions & Handling (Clauses 12.5 & Tables)

• Wall Poles No. 1 to 4:
  • Bottom dia: 30-40 mm, shell thickness min 5 mm
  • Lengths vary ~1560 to 2100 mm
• Ridge Poles No. 4 to 6:
  • Shell thickness min 5-10 mm, top dia 40 mm
  • Fittings: caps, loops, bands with rivets (3-5 mm dia holes)
• Standing Poles No. 1 to 6:
  • Shell thickness min 5-12.5 mm
  • Caps, spikes, cross pins, bands as per pole number
  • Dimensions vary, e.g., Pole No.1 length ~4930 mm, top dia 75±5 mm

Handling Accessories

• Spikes & Rivets: 3-5 mm diameter
• Fittings: Caps, loops, bands fitted as per pole type
• Projection due to fittings: 38-50 mm

Summary Table: Preservation Method

IS 7344 - Testing and Inspection: Key Points & Specifications

1. Certification & Marking (Clause 9.2.1)

• Use of BIS Standard Mark follows Bureau of Indian Standards Act, 1986.
• License conditions for manufacturers available from BIS.
• Contact BIS regional/branch offices for certification and testing.

2. Workmanship & Tolerances (Clause 5.2)

• Normal manufacturing tolerances apply where not specified.
• Refer to Figures 1, 2, and 3 for dimensional tolerances.

3. Preservation & Fittings (Clause 12.5, Table 8)

• Pole Dimensions & Fittings:

• Hole & Rivet Details:
  • 5 mm diameter holes for rivets.
  • Welded MS round caps and bands.
  • Strengthening bands fitted as per pole size.

4. Temporary Corrosion Prevention

• Use specified temporary corrosion preventive fluids and hard films (solvent deposited).

Summary Diagram: Inspection & Fittings Setup

flowchart LR
    A[Manufacturing] --> B[Dimension Check]
    B --> C{Tolerance Check}
    C -->|Within Limits| D[Surface Finish & Preservation]
    C -->|Out of Limits| E[Rework]
   

IS 7344 - Key Specifications & Tables Summary (Clause 12.5 & Related)

1. Pole Dimensions & Fittings (Selected Poles No. 4, 5, 6)

2. Shell Thickness & Diameters

• Thin end diameter: 45 ± 5 mm, shell thickness minimum 5 mm
• Ridge poles thin end diameter: 40 mm, shell thickness 10 mm
• Standing poles top diameter: 75 ± 5 mm, shell thickness minimum 10-12.5 mm

3. Rivets & Holes

• Rivet diameter: 5 mm (MS rivets)
• Holes drilled for rivets: 5 mm diameter
• Flush rivets with 3 mm diameter pins at ends for some poles

4. Accessories & Strengthening

• Strengthening bands: MS round, 6 mm diameter
• Caps, loops, bands specified per pole number with projections detailed
• Socket and spike dimensions vary per pole type

Summary Diagram: Pole End Fittings

graph LR
A[Thin End Diameter 45 ± 5 mm]
B[Shell Thickness ≥ 5 mm]
C[Cap Fitting]
D[Loop & Band Fitting]
E[Projection: Cap =