Detailed Explanation of Installation and Construction Technology for Finished Resin Drainage Channel

1. General Construction Flow

2. Sequence of Diversion Trench Excavation

Pre-Construction Preparation

1. Construction shall not start with random excavation. Geological investigation must be carried out to check stratum conditions and data, and confirm suitable locations for drainage channel construction.
2. Before trench excavation, review and verify the setting-out lines.
3. Before excavation, inspect underground structures and existing drainage systems on site. Complete 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 safety and technical disclosures to ensure smooth completion of the works.
5. Machinery for earth excavation: crawler excavator.

Construction Method

1. Use an electronic theodolite to set the central axis, mark with wooden stakes. Measure the edge lines of the drainage channel with a measuring tape 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 deviation. Level the trench bottom with masonry mortar.
3. Install side formworks (processed timber), fixed with cement and steel 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 rainproof and moisture-proof measures.
6. Do not stack materials within 2.2 m around the trench. No vehicles are allowed near the foundation edge after excavation.
7. Install moisture-proof facilities around the trench and restrict access by non-construction personnel.

Earthwork Procedures During Construction

1. Clearly mark the excavation control line on both walls of the trench.
2. Earthwork shall not damage nearby buildings and infrastructure.
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 520 mm between the trench bottom and the foundation/cushion edge. Install drainage ditches and intercepting ditches on the outer side to drain sewage 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 foundation 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 trenching is allowed. Solve problems promptly.
10. When excavating to within 49 cm above the trench bottom, mark the central axis line as the reference for leveling.
11. Stockpile excavated soil at least 5 m away from the trench edge, with stacking height not exceeding 4.5 m.
12. Level and adjust the trench bottom after completion.
13. Transport all surplus soil off-site after compaction and stabilization.
14. Reduce vibration to the foundation after trench excavation. If foundation works are delayed, leave 0.5 m of soil unexcavated and remove it before construction.