Repair Methods for Damaged Construction Waste Chutes

Construction waste chutes may develop local damage during use; timely repair extends service life and avoids full replacement. This article introduces damage repair methods.

1. Damage Types
2. Cracks

Longitudinal cracks

Transverse cracks

Cause: impact or aging

2. Holes

Holes caused by waste impact

Cause: high-speed impact of large blocks

3. Wear Thinning

Buffer section wear

Bottom section wear

Cause: long-term erosion

4. Local Deformation

Chute dents

Cause: external impact

1. Repair Methods
2. Small Crack Repair (<50 mm)

Clean the crack surface

Hot-air weld with HDPE-specific welding rod

Grind smooth after welding

Applicable to: non-load-bearing areas

2. Small Hole Repair (<100 mm)

Clean around the hole

Cover with an HDPE sheet

Hot-air weld around the edges

Or use specialized plastic repair adhesive

3. Large Holes / Severe Wear

Full section replacement recommended

Repair is costly and unreliable

Especially buffer sections and bottom sections

4. Outer Wall Reinforcement

Wrap the outer wall at the damaged area with FRP

Apply epoxy resin

Increase strength

Temporary measure

III. HDPE Welding Procedure

1. Tools

Hot-air welding gun

HDPE welding rod (same material)

Temperature: 250–300 °C

2. Steps

Clean the damaged area (dry and clean)

Cut a V-groove (depth = 1/2 of wall thickness)

Hot-air heat the welding rod and base material

Weld and fill

Grind smooth after cooling

Check sealing performance

3. Quality

Weld seam strong

Sealed, no leakage

No cold welds

1. Conditions Not Suitable for Repair

Cracks exceeding 1/3 of chute length

Severe aging in multiple areas

Wall thickness wear exceeding 50%

Buffer section severely worn

Rupture at joints

In the above cases, full section replacement is mandatory

1. Post-repair Inspection

Weld seam appearance

Sealing test

Strength check

Verify with trial waste discharge

Record repair location and time

1. Repair Precautions

Must use HDPE welding rod of the same material

Welding surfaces must be dry and clean

Accurate temperature control

Repair only non-load-bearing areas

Load-bearing areas (buffer section, bottom) must be directly replaced

VII. Longkang Repair Services

Provide welding rods and tools

Technical guidance on repair methods

Direct section replacement for severe damage

Wear sections kept in stock

Fast shipping and replacement