collapsible gates
1983 Edition

Scope Summary and Ordering Instructions

Overview (Clause 8.1)

• Buyers must provide comprehensive details when ordering collapsible gates.
• Test result values should be rounded according to the guidelines in IS 2-1960, maintaining the precision of the stated figures.

Roller Wheel Specifications (Clause 6.3, Table 1)

Additional Details (Clause 6.2)

• Maximum vertical channel spacing is 100 mm when the gate is closed.
• Channels are riveted in pairs with spacers; cross lacings are positioned between 450 and 600 mm from the bottom.
• The clear vertical distance between cross lacings does not exceed 150 mm.
• Edges are trimmed; locking loops and handles are either welded or riveted; roller wheels are installed accordingly.

This section defines the scope and essential technical data required for the production and ordering of collapsible rolling gates as per the standard.

Definitions and Main Parts of Collapsible Gates

Essential Components (Clauses 2.1 - 2.6, Figure 1):

• Vertical Channels: Riveted in pairs with toes facing each other; maximum spacing 100 mm when closed (Clause 6.2).
• Cross Lacings: Flat bars connecting vertical members, set at heights between 450 to 600 mm with a maximum clear spacing of 150 mm between sets.
• Top Runner: Horizontal steel channel supporting the upper roller wheels.
• Roller Wheels: Size and quantity depend on gate width and panel type (see Table below).
• Locking Points and Handles: Attached to edges by welding or riveting.

Table: Roller Wheel Specifications (Clause 6.3)

Additional Specifications:

• Channel spacing limited to 100 mm (Clause 6.2)
• Cross lacings positioned between 450-600 mm height; clear spacing between sets not exceeding 150 mm
• Numerical values should be rounded as per IS 2-1960 (Clause 0.4)

Classification and Material Requirements of Collapsible Gates

Material and Fabrication (Clause 6.1)

• Utilizes rolled steel sections such as channels, T-profiles, E-profiles, and flat bars.
• Fabrication follows typical gate framework designs as illustrated in Figure 1.
• Roller wheels may be positioned on bottom runners made from T or E sections or on flat top runners.

Classification Criteria

Gates are categorized based on:

• The steel section profile employed (channels, T-sections, E-sections)
• Roller placement (bottom or top rolling)
• Dimensions and spacing of vertical and horizontal structural members

Common Dimensions and Spacing

Roller Load Distribution Example

[ \text{Load per roller} = \frac{\text{Total gate weight}}{\text{Number of rollers}} ]

Diagram: Typical Section of a Collapsible Gate

graph LR
A[Flat Top Runner] --> B[Roller Wheel]
B --> C[Vertical Channel]
C --> D[Horizontal Flat Bars]
D --> E[T or E Bottom Runner]
E --> B

Refer to Figure 1 and related clauses in the standard for comprehensive details.

Materials and Their Specifications as per the Standard

1. Roller Wheels (Clause 6.3, Table 1)

2. Channel Assembly and Spacing (Clause 6.2)

• Maximum spacing between vertical channels is 100 mm with gate closed.
• Channels are riveted in pairs with spacers installed.
• Cross lacings are fixed at 450-600 mm height; clear space between lacings not exceeding 150 mm.
• Edges are trimmed; locking loops and handles are welded or riveted.
• Roller wheels are installed in designated channels.

3. Referenced Materials

• Ordinary quality structural steel
• Grey cast iron for roller wheels
• Wrought aluminum bars and sections
• Rivets under 12 mm diameter

4. Surface Treatment (Clause 6.7)

• Fabricated elements must be coated with a red oxide primer conforming to IS 102-1962.

This section summarizes the material and finishing requirements necessary for the construction and longevity of collapsible gates.

Components and Their Specifications for Collapsible Gates

Roller Wheel Requirements (Clause 6.3)

Additional Assembly Details:

• Channel spacing must not exceed 100 mm when the gate is closed (Clause 6.2).
• Cross lacings are positioned between 450 to 600 mm height with clear space of up to 150 mm between sets.
• Channels are riveted in pairs with spacers; edges are trimmed.
• Locking loops and handles are welded or riveted.
• Roller wheels are installed accordingly.
• Optional latches may be used to secure open positions (Clause 7.2).

Ordering Notes:

• Test values to be rounded according to IS 2-1960.
• Buyers must specify gate dimensions and detailed requirements during order placement (Clause 8.1).

Key Guidelines for Fabrication and Assembly

Fabrication Details (Clause 6.2)

• Maintain a maximum spacing of 100 mm between vertical channels when the gate is closed.
• Vertical channels are riveted in pairs with toes facing each other and spacers in between.
• Cross lacings are installed as one set at a height between 450 and 600 mm, with spacing of up to 150 mm between sets.
• Edges must be trimmed neatly; locking loops and handles are attached by welding or riveting.
• Roller wheels are mounted in accordance with Table 1.

Rivets (Clause 5.6)

• Use snap-headed rivets with a diameter of at least 6 mm.
• Rivets must comply with IS 2155-1962.

Surface Finishing (Clause 6.7)

• Apply red oxide primer as per IS 102-1962 on all fabricated parts.

Roller Wheel Specifications (Clause 6.3, Table 1)

Specifications for Extra Fixtures in Collapsible Gates

1. Supporting Fixtures (Clauses 7.1 & 6.5):

   • Provide appropriate holding fixtures to secure the end vertical channels at the opening's face.
   • These fixtures maintain alignment and ensure the secure installation of the gate.

2. Finishing Requirements (Clause 6.7):

   • All fabricated components shall be coated with red oxide primer conforming to IS:102-1962 (ready mixed red lead primer).

3. Roller Wheel Details (Clause 6.3, Table 1):

Summary:

• End channels must be fitted with suitable holding fixtures.
• Use red oxide primer as specified.
• Select roller wheels according to panel width and type, with appropriate quantity and bearing requirements.

Details Buyers Must Provide When Ordering (Clause 8.1 & Table 1)

To ensure accurate production and installation, purchasers should supply:

• Precise height and width measurements of the gate
• Specific collapsible gate type
• Details of the surrounding structure where the gate will be installed
• Preferred roller wheel position (top or bottom runner) and whether ball bearings are needed

Roller Wheel Requirements Summary (Clause 6.3)

Notes:

• Wheel size and quantity increase according to gate width and panel type.
• Ball bearings are compulsory for double panels wider than 2.0 m.
• Test results should be rounded following IS 2:1960.