Analysis of Complete Technical Process for Genuine Resin Drainage Channel and Installation

Sewage Excavation Sequence:

Pre-Construction Work for Genuine Resin Drainage Channel

1. Such projects shall not start with random excavation. Geological investigation must be carried out to check geological conditions and parameters, and confirm suitable locations for drainage channel construction.
2. Before trench excavation, review and verify the setting-out lines.
3. Before trench excavation, inspect underground structures and existing drainage systems on site. Complete surface 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 mini-excavators.

Construction Process of Genuine Resin Drainage Channel

1. Use a total station to set the central axis, mark with wooden stakes. Measure the inner edge of the drainage channel with a steel ruler and mark the slope with black 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 length per design to avoid over-excavation. Level the ditch bottom with concrete.
3. Install side formworks (processed timber), fixed with concrete nails. Install transverse supports every 1.4 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; curing period shall not be less than 7 days.
5. Monitor weather conditions during construction, avoid working in rain, and take waterproof and moisture-proof measures.
6. Do not stack materials within 2.3 m around the trench. No vehicles are allowed near the pile foundation edge after excavation.
7. Install moisture-proof facilities around the trench and restrict access by non-construction personnel.

Backfilling Procedures During Construction

1. Clearly mark the excavation control line along the trench edge.
2. Special personnel shall be responsible for backfilling to avoid damaging nearby buildings and underground pipelines.
3. Monitor slope stability at all times; handle soil stress immediately.
4. Inspect the trench promptly after excavation, then pour concrete cushion and seal it before proceeding to the next process.
5. Reserve a working space of at least 510 mm between the trench bottom and the foundation/cushion edge. Install drainage ditches and catch wells on the outer side 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 geological conditions and groundwater changes and keep records. If the foundation soil does not meet design requirements, coordinate with the design department for solutions.
9. Backfilling shall ensure retaining wall stability; no random patching is allowed. Solve problems promptly.
10. When excavating to within 48 cm above the trench bottom, mark the horizontal line as the reference for leveling.
11. Stockpile excavated soil at least 4.8 m away from the trench edge, with stacking height not exceeding 4.6 m.
12. Level and finish the trench bottom after completion.
13. Transport all surplus soil off-site after compaction and stabilization.
14. Reduce vibration to the foundation after pile foundation excavation. If foundation works are delayed, leave 0.5 m of soil unexcavated and remove it before construction.