The connection structure is a key component of construction waste chutes, directly affecting sealing, strength and installation efficiency. Longkang adopts a socket-and-spigot quick-release buckle connection, featuring fast installation, good sealing and high strength. This article explains the technical requirements of the connection structure in detail.
- Comparison of Connection Methods
| Connection method |
Installation speed |
Sealing |
Strength |
Cost |
Adopted by Longkang |
| Quick-release buckle |
Fast |
Good |
High |
Medium |
✓ |
| Flange bolt |
Slow |
Good |
High |
High |
|
| Socket cementing |
Medium |
Medium |
Medium |
Low |
|
| Welding |
Slow |
Good |
High |
Medium |
|
| Clamp connection |
Medium |
Medium |
Medium |
Low |
|
Longkang selects the quick-release buckle connection, balancing efficiency and reliability.
- Composition of the Longkang Connection Structure
- Socket and spigot
- One end is a socket (slightly larger inner diameter)
- One end is a spigot (standard outer diameter)
- Socket insertion depth 50mm
- The spigot is inserted into the socket to achieve the joint
- Sealing ring
- Material: EPDM (ethylene propylene diene monomer) rubber
- Cross-section: circular Φ8mm
- Hardness: Shore A 60±5
- Compression ratio: 30%
- Temperature resistance: -40℃ – +120℃
- Aging resistance: ≥10 years
- Quick-release buckle
- Material: galvanized steel plate or stainless steel
- Quantity: 2 per interface (arranged oppositely)
- Bolts: M8 stainless steel
- Operation: tighten with a wrench, completed in 10 seconds
- Tensile resistance: ≥5kN
- Positioning rib
- A positioning rib is provided at the spigot end
- Ensures proper socket insertion
- Prevents over-insertion
III. Technical Requirements for the Connection Structure
- Dimensional accuracy
- Socket inner diameter: D+3mm (3mm larger than the pipe outer diameter)
- Spigot outer diameter: standard D
- Socket clearance: 1.5mm (one side)
- Sealing ring groove depth: 4mm (30% compression ratio)
- Sealing performance
- 05MPa air pressure held for 5 minutes, no leakage
- No leakage under the water spray test
- No leakage of mortar slurry
- Connection strength
- Axial tensile resistance: ≥5kN (approx. 500kg)
- Radial shear resistance: ≥3kN
- Bending angle: ≤2° (normal use)
- Buckles do not loosen or fracture
- Installation efficiency
- Single interface installation time: ≤30 seconds
- With 2-person cooperation, 30–50 m can be installed per person per day
- Key Points of Connection Structure Design
- Dislodgement prevention
- The buckle cannot disengage after locking
- An anti-loosening structure is provided (self-locking buckle)
- No dislodgement under self-weight pull-down in high-rise pipes
- Misalignment prevention
- Positioning ribs ensure coaxiality
- Uniform socket insertion depth
- Pipe straightness deviation ≤2° per section
- Wear resistance
- The spigot end is chamfered for easy insertion
- Sealing ring groove is smooth, with no burrs
- Sealing does not degrade after repeated disassembly and assembly ≥20 times
- Corrosion resistance
- Buckles are made of galvanized or stainless steel
- Bolts are made of stainless steel
- Sealing rings are resistant to cement slurry corrosion
- Common Connection Problems
- Sealing ring dislodgement
- Cause: sealing ring not in position during installation
- Prevention: check the sealing ring position before installation
- Handling: disassemble and reinstall
- Interface dust leakage
- Cause: sealing ring damaged or insufficient compression
- Prevention: inspect the sealing ring regularly
- Handling: replace the sealing ring
- Buckle loosening
- Cause: vibration causing bolt loosening
- Prevention: check and tighten monthly
- Handling: retighten
- Spigot not in position
- Cause: debris obstruction
- Prevention: clean the socket and spigot
- Handling: reinstall
- Longkang Standard Connection Fittings Configuration
Each standard section is supplied with:
- 1 EPDM sealing ring (Φ8 × perimeter)
- 2 galvanized quick-release buckles
- 2 sets of M8 stainless steel bolts
- Installation instructions
Optional upgrades:
- Stainless steel buckles (stronger corrosion resistance)
- Silicone sealing rings (high-temperature resistant)
- Anti-dislodgement safety pins (for high-rise projects)
VII. Longkang Connection Quality Assurance
- Each section is trial-assembled at the interface before leaving the factory to check sealing
- Sealing ring performance is tested per batch
- Buckles undergo tensile testing
- Spare sealing rings are supplied with each shipment (1 spare ring per 10 sections)
- Free replacement for connection problems within the warranty period
