Sorting out the Precise Construction Method and Planning

for Genuine Resin Drainage Channel

Sequence of Diversion Trench Excavation:

Pre-Construction Work for Genuine Resin Drainage Channel

1. Such construction projects shall not start with random excavation. A geological survey must be carried out to check the stratum conditions and parameters, and confirm whether the site is suitable for drainage channel construction.
2. Before trench excavation, review and verify the setting-out lines.
3. Before foundation excavation, inspect underground structures and existing drainage systems on site. Complete on-site external drainage works to prevent water from flowing into the trench and affecting construction. This step is mandatory.
4. Organize construction personnel and machinery, and complete all safety and technical disclosures to ensure smooth completion of the works.
5. Machinery for earth excavation and backfilling: stationary and crawler excavators.

Construction Method for Genuine Resin Drainage Channel

1. Use a total station to set the central axis, mark with wooden stakes. Measure the side edges of the drainage channel with a steel ruler and mark the slope with white lines. Mark boundaries and wall position lines at the same time.
2. Manually excavate soil within the setting-out area, strictly controlling the excavation depth and width per design to avoid over-excavation. Level the trench bottom with dry-mixed mortar.
3. Install side formworks (processed timber), fixed with concrete and steel nails. Install transverse supports every 1.3 m to prevent formwork displacement. Apply release agent on the contact surface between formwork and concrete.
4. Cover and cure the concrete with water within 21 hours after pouring. Under normal temperature, water at least twice a day; the curing period shall not be less than 7 days.
5. Monitor weather conditions during construction, avoid working in rain, and take waterproof and rainproof measures.
6. Do not stack materials within 2.1 m around the trench. No vehicles are allowed near the pile foundation edge after excavation.
7. Install waterproof facilities around the trench and restrict access by non-construction personnel.

Earthwork Guidelines During Construction

1. Clearly mark the excavation control line along the trench edge.
2. Earthwork shall be carried out by designated personnel to avoid damage to nearby buildings and pipelines.
3. Monitor slope stability at all times; handle soil deformation immediately.
4. Inspect the trench promptly after excavation, then pour and seal the cushion before proceeding to the next process.
5. Reserve a working space of at least 520 mm between the trench bottom and the foundation/cushion edge. Install drainage ditches and fire pools on both sides of the pile foundation to remove accumulated water timely.
6. Protect survey control stakes and axis piles, cover with steel cages, and assign professional surveyors to monitor their safety.
7. During excavation, check positioning stakes, axis piles and formworks for firmness and alignment.
8. Monitor soil conditions and groundwater changes and keep records. If the foundation soil does not meet design requirements, coordinate with the design department for solutions.
9. Earthwork shall ensure retaining wall stability; no random trenching is allowed. Solve problems promptly.
10. When excavating to within 49 cm above the trench bottom, mark the axis line as the reference for leveling.
11. Stockpile excavated soil at least 5.1 m away from the trench edge, with stacking height not exceeding 4.5 m.
12. Level and trim the trench bottom after completion.
13. Transport all surplus soil off-site after compaction and stabilization.
14. Reduce vibration to the pile foundation after trench excavation. If foundation works are delayed, leave 0.3 m of soil unexcavated and remove it before construction.