Detailed Technical Process Explanation of Resin Concrete Drainage Channel and Safe Construction

1. General Construction Flow

2. Drainage Trench Excavation Sequence

Pre-Construction Preparation for Resin Concrete Drainage Channel

1. Construction shall not start with random excavation. Geological survey 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 on-site drainage works to prevent groundwater from flowing into the trench and affecting construction. This step is mandatory.
4. Organize construction personnel and machinery, and complete all technical disclosures to ensure smooth completion of the works.
5. Machinery for earth excavation and backfilling: crawler excavator.

Construction Process of Resin Concrete Drainage Channel

1. Use a total station to set the central axis and mark it with wooden stakes. Measure the edge lines of the drainage channel with a steel tape and mark the slope with lines. Mark boundaries and wall alignment 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 trench bottom with dry-mixed mortar.
3. Install side formworks (processed timber), fixed with mortar and steel nails. Install vertical supports every 1.2 m to prevent formwork displacement. Apply the release agent on the contact surface between the formwork and concrete.
4. Cover and cure the concrete with water within 12 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 rainproof measures.
6. Do not stack materials within 2.5 m around the trench. No vehicles are allowed near the excavated trench edge.
7. Install rainproof facilities around the trench and restrict access by non-construction personnel.

Construction and Excavation Notes for Resin Concrete Drainage Channel

1. Mark the excavation slope line of the trench edge clearly.
2. Earthwork shall not damage nearby structures and underground pipelines.
3. Monitor slope stability at all times; handle landslides immediately.
4. Inspect the trench promptly after excavation, then pour the concrete cushion and seal it before proceeding to the next process.
5. Reserve a working space of at least 490 mm between the trench bottom and the foundation/cushion edge. Install drainage ditches and catch wells on one side to drain water timely.
6. Protect survey control stakes and axis piles, cover with protective 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 slope stability; no random patching is allowed. Solve problems promptly.
10. When excavating to 45 cm above the trench bottom, mark the axis line as the reference for leveling.
11. Stockpile excavated soil at least 5.2 m away from the trench edge, with stacking height not exceeding 4.9 m.
12. Level and finish the trench bottom after completion.
13. Transport all surplus soil after compaction and stabilization.
14. Reduce vibration to the foundation after trench excavation. If foundation works are delayed, leave 0.3 m of soil unexcavated and remove it before construction.