Article 3: How to Select Construction Waste Chute Specifications for Different Building Heights

Building height is the primary factor in selecting construction waste chute specifications. Pipe length, fixing method, buffer design, and load capacity requirements vary greatly with different heights. Drawing on years of engineering experience, Longkang explains the selection method by building height categories.

1. Low-rise Buildings (1–3 floors, height ≤10m)

Applicable scenarios: low-rise residences, street-front shops, small factory buildings, partial renovation of existing buildings

Selection recommendations:

• Diameter: 400mm is sufficient
• Wall thickness: 6mm, Standard type
• Section length: 1.5m
• Fixing method: one fixing point every 3m, directly hung on the scaffolding
• Buffer design: no buffer section required
• Feed inlets: one per floor
• Total number of sections: approx. 8–10 sections

Features:

• Short pipe, slow falling speed, low impact
• Simplest installation; discharges directly from a window or balcony
• Lowest cost; available for rental
• Collection hopper connected directly at the bottom

1. Multi-story Buildings (4–6 floors, height 10–20 m)

Applicable scenarios: multi-story residences, office buildings, schools, hospital podiums

Selection recommendations:

• Diameter: 400–500 mm
• Wall thickness: 6–8 mm
• Fixing method: one fixing point every 4m, using the external scaffold or structural columns
• Buffer design: one buffer section at the bottom
• Feed inlets: one per floor
• Total number of sections: approx. 10–15 sections

Notes:

• At 20m height, waste falls at approx. 15m/s; the bottom must be reinforced
• Feed inlet must be ≥1.5m above the ground to prevent waste splashing at the bottom
• Bottom discharge outlet must be ≤500mm from the collection hopper

III. Mid-to-High-Rise Buildings (7–18 floors, height 20–60 m)

Applicable scenarios: high-rise residences, apartments, hotels, office buildings

Selection recommendations:

• Diameter: 500mm, Standard type
• Wall thickness: 8mm, Heavy-duty type
• Fixing method: one fixing point every 4–5 m
• Buffer design: one buffer/deceleration section every 20–30 m
• Feed inlets: one per floor, with movable door
• Total number of sections: approx. 15–40 sections

Key technical points:

1. Buffer section design: uses elbow sections (45° bends) to change the falling direction and dissipate kinetic energy
2. Fixing point spacing decreases with height: 5m at the lower part, 4m in the middle, 3m at the top
3. A feeding platform is provided at the top; waste is fed from the floors
4. Bottom discharge outlet connects to a sealed collection hopper to reduce fugitive dust

Throughput calculation:

• A 500mm chute has a daily throughput of approx. 20m³
• Sufficient for waste output from a typical floor of 2000–3000 m²
• During peak periods (masonry stage), two-shift operation is possible

1. High-Rise Buildings (19–33 floors, height 60–100 m)

Applicable scenarios: super high-rise residences, office buildings, hotels, apartments

Selection recommendations:

• Diameter: 500–600 mm
• Wall thickness: 10mm, Heavy-duty type
• Fixing method: one fixing point every 3–4 m, using steel-structure clamps
• Buffer design: one buffer section every 15–20 m, with at least 3 buffer stages
• Feed inlets: one per floor, sealed feeding door
• Total number of sections: approx. 40–70 sections

Key design points:

1. Multi-stage buffering: buffer sections at 20m, 40m, and 60m to ensure the falling speed is ≤20m/s
2. Pipe stability: fixing points must be anchored into structural beams or shear walls, and must not be hung only on the scaffold
3. Staged installation: extended upward floor by floor in step with the main structure construction progress
4. Anti-sway: high-rise wind loads are large; guy ropes or lateral braces must be provided for the pipe

Safety requirements:

• Interlocked doors at feed inlets to prevent falling objects
• Protective shed and warning zone at the bottom
• Inspect fixing points and connecting fasteners daily

1. Super High-Rise Buildings (over 33 floors, height >100m)

Applicable scenarios: super high-rise landmark buildings, urban complexes, super high-rise office buildings

Selection recommendations:

• Diameter: 600mm, Reinforced type
• Wall thickness: 10–12 mm
• Fixing method: one fixing point every 3m, using a dedicated steel-structure fixing system
• Buffer design: one buffer section every 10–15 m, with 5–6 deceleration stages
• Feed inlets: sealed feed inlet on each floor, with a dust extraction port
• Bottom: sealed collection system + dust removal device

Special requirements:

1. Dedicated design: super high-rise chutes require separate design calculations, including wind loads and seismic loads
2. Staged inspection: inspection openings every 30m for easy cleaning and maintenance
3. Dust removal system: a negative-pressure dust extraction device connected at the bottom, meeting green construction requirements
4. Monitoring: vibration sensors can be added to monitor pipe condition
5. Quick Selection Table by Building Height

VII. Longkang Selection Service

Longkang's technical team can provide the following based on architectural drawings:

1. Precise calculation of the number of sections based on building height and number of floors
2. Design of buffer section locations and quantities
3. Fixing point layout drawings
4. Complete configuration list and quotation
5. On-site installation guidance