The construction waste chute system consists of standard sections and various functional sections; elbow sections are key components for changing pipe direction and for buffering and deceleration. Longkang's standard sections and elbow sections are designed as a matched set and must be properly configured during selection. This article explains the selection and configuration method for standard sections and elbow sections.
- Standard Sections
- Function
- Forms the main pipe body
- Vertically conveys waste
- Section length 1.5m (standard)
- Specifications
- Diameter: 400/500/600mm
- Wall thickness: 6/8/10mm
- Connection flanges at both ends
- Fixing clamp point at the middle
- Quantity calculation
- Determined by total pipe length
- Total length ÷ 1.5m = number of standard sections
- Deduct the length occupied by elbow and buffer sections
- Elbow Sections (Bend Sections)
- Function
- Changes pipe direction
- Buffers and decelerates (dissipates the kinetic energy of falling waste)
- Connects different installation segments
- Angle specifications
- 30° elbow: gentle bend, low resistance
- 45° elbow: commonly used buffer angle
- 60° elbow: sharper bend
- 90° elbow: right-angle turn
- Length
- 45° elbow: about 0.8m
- 90° elbow: about 0.6m
- Standard interfaces at both ends of the elbow section
III. Buffer Sections (Deceleration Sections)
- Function
- Slows the falling speed of waste
- Reduces impact at the bottom
- Extends pipe service life
- Structural types
- 45° elbow buffer: uses the bend to dissipate kinetic energy
- Spiral buffer: spiral deflectors on the inner wall
- Enlarged buffer: locally enlarged diameter to create vortex deceleration
- Installation principles
- One buffer section every 15–25 m
- For super high-rise, every 10–15 m
- Buffer must be installed at the bottom
- Feed-in Sections
- Function
- Floor-level waste feed inlet
- Connects the floor to the main pipe
- Types
- Side feed-in section: feed opening on the side of the pipe with a movable door
- Top feed-in section: feeds from the top of the pipe, connecting to the floor platform
- Elbow feed-in section: 90° turn, fed horizontally from the floor then falls vertically
- Configuration
- One feed inlet per floor
- With sealed door (dust and splash proof)
- Grid can be installed to intercept large blocks
- Discharge Sections
- Function
- Bottom waste discharge end
- Connects to collection hopper or waste truck
- Types
- Direct-drop discharge: vertical direct discharge
- Elbow discharge: 90° turn, horizontal discharge into collection hopper
- Sealed discharge: with closing door to reduce dust
- Configuration
- Within ≤500mm of the collection hopper
- Can connect to canvas flexible connector
- Optional dust extraction interface
- Inspection Sections
- Function
- Clearing when the pipe is blocked
- Routine inspection and maintenance
- Observing conditions inside the pipe
- Types
- Observation section: with transparent viewing window
- Opening section: removable cover plate
- Inspection section: large opening for easy hand cleaning
- Installation principles
- One inspection section every 30m
- Inspection sections must be installed at turns
- Inspection section must be installed at the bottom
VII. Section Configuration Example
Example: an 80m high-rise residential building with a 500mm-diameter chute
| Section type |
Quantity |
Description |
| Standard section (1.5m) |
About 48 sections |
Main pipe |
| 45° buffer section |
3 |
At 20m/40m/60m |
| Feed-in section |
27 |
One per floor |
| 90° top feed elbow |
1 |
Top feed opening |
| 90° bottom discharge elbow |
1 |
Discharges to collection hopper at the bottom |
| Inspection section |
4 |
One every 20m |
| Connection fasteners |
60 sets |
At both ends of each section |
| Fixing clamps |
25 sets |
One every 3–4 m |
VIII. Selection Considerations
- Turn angle should not be too small: turns <30° are prone to blockage
- Buffer sections are required: without buffers in high-rise projects, the bottom is easily damaged
- Inspection openings cannot be omitted: without them, blockages cannot be cleared
- Feed inlet with door: prevents dust and splashing
- Discharge outlet sealed: bottom dust is a key control area
- Longkang Section Accessories
Longkang provides a complete section product line:
- Standard sections: 1.5m, three diameters
- Elbow sections: 30°/45°/60°/90°
- Buffer sections: dedicated 45° buffer design
- Feed-in sections: side feed / top feed, with movable door
- Discharge sections: direct-drop / elbow / sealed
- Inspection sections: observation opening / opening type
- Connection fasteners: quick-lock, with sealing rings
All sections have unified interfaces, good interchangeability, and can be freely combined.
