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Track and field inner ring ditch side wall construction method
There are two main types of inner wall ditch side wall designs: reinforced concrete structures and masonry structures. Each has its own construction method and requirements, depending on the project's specifications and environmental conditions.
When constructing a reinforced concrete structure, it is essential to pour at least 10 cm of wall concrete when pouring the floor slab. The process involves cushioning the concrete on the side walls, marking the line for the side walls, supporting the foundation formwork, binding the bottom reinforcement, and placing cement blocks in the concrete. After the foundation concrete is vibrated, the first layer of the side wall formwork should be erected immediately at the side wall position. Alternatively, 10 cm x 10 cm square wood can be used as an alternative to the template. This section of concrete serves two important purposes: it enhances the stability and firmness of the base of the side wall, and it allows for the use of side wall molds, which are typically made from steel and wood support systems.
The concrete pouring method involves pouring both walls simultaneously, with each layer being between 30 to 40 cm thick. A plug-in vibrator is used during this process, ensuring that it does not come into contact with the reinforcement or the formwork. When lifting the vibrator, it should be done slowly to avoid creating voids. Proper vibration ensures that the concrete settles without over-vibrating, which could lead to segregation. At the same time, concrete test blocks must be made. These blocks are 15 cm x 15 cm x 15 cm in size, with three blocks per group. They are then cured under standard conditions and tested after 28 days to determine their compressive strength, which is used for acceptance documentation.
For masonry structures, the process begins after the concrete floor is poured. The height and measurement lines are marked, and the width lines for the masonry are set. Masonry work starts at the lowest point of the inner ring ditch, taking into account the drainage gradient and changes in side wall height. To accommodate these variations, a block thickness adjustment section is used, ensuring that all joints align horizontally and preventing any diagonal seams. Adjustments can also be made in the middle of the wall, as shown in Figure III.
Masonry mortar must meet specific standards. It should consist of Portland cement, ordinary Portland cement, or slag cement with a grade higher than 325. The sand used should be clean, medium to coarse, with less than 3% clay content, and mixed with drinking water. Lime-based mortars or mixed cement-sand mortars are not recommended. The mortar mix must comply with the design specifications.
The quality requirements for the inner ring ditch are detailed in the following table:
| Project | Quality Requirements | Allowable Deviation | Test Frequency | Points | Detection Method |
|--------|----------------------|---------------------|----------------|--------|------------------|
| Concrete Compressive Strength | By design requirements | Not lower than | Each shift | A group | Cement mixing, soil specification |
| Mortar Compressive Strength | By design requirements | Not lower than | Each shift | A group | Masonry specification |
| Gully Elevation | Design width | ±10mm | 20m | 1 | Leveling |
| Groove Width | Design width | ±10mm | 20m | 1 | Use ruler |
| Wall Verticality | 0 | ≤10mm | 20m | 1 | With a vertical ruler |
| Gully Elevation | Design elevation | Not higher than | 20m | 1 | Leveling |
Note:
1. The strength tests for mortar and concrete are conducted according to relevant specifications.
2. The detection points are randomly selected.
This detailed approach ensures that both reinforced concrete and masonry structures meet the required standards, providing durability, functionality, and safety for the inner wall ditch system.