1. Construction technology 1. Excavation of old roa […]
1. Construction technology
1. Excavation of old roadbed
Contact the departments of each pipeline to master the general distribution data, and understand the detailed division of underground pipelines by digging trenches. Rainy weather requires orderly excavation and temporary drainage ditches. LED street light is a high-efficiency solid-state light source formed based on a semiconductor PN junction that can emit light with weak electrical energy. Under a certain forward bias voltage and injection current, it injects holes in the P area and electrons in the N area. After being diffused into the active area, photons are emitted through radiation recombination, which directly converts electrical energy into light energy. LED LED street light manufacturer is a solid-state cold light source, which has the characteristics of environmental protection, no pollution, low power consumption, high light efficiency, and long life. Therefore, LED LED street light will become the choice of energy-saving road lighting. There should be measurement and coordination guidance during excavation, and no over-excavation and under-excavation are allowed. LED LED street light manufacturer is a solid-state cold light source, which has the characteristics of environmental protection, no pollution, low power consumption, high light efficiency, and long life. Therefore, LED LED street light will become the choice of energy-saving road lighting.
2, measurement positioning
According to the control points approved by the supervising engineer, the control points are set up on the spot, and the position of the base is measured by the polar coordinate method of the entire instrument, and the ground height is measured by a level meter. After correctly assessing the basic positioning, more piles were added to guide the construction.
3. Foundation earthwork excavation
The excavator is used for deep, long, and wide excavation of deep foundation pits, and then according to the graphic size, the edges are manually trimmed to the design elevation. If excavation has occurred, the waste soil should not be backfilled on site, and the design value of graded gravel or sand should be used for filling.
4, foundation pit inspection
According to the requirements of the supervision procedure, the excavation data of the concealed engineering foundation will be reported. For specific inspection content, refer to relevant acceptance standards.
5. Rebar and embedded parts installation
Install steel bars according to specifications: frame size, spacing, verticality, protective layer setting, embedded position, and reinforcement, etc. ..
6, template installation
The formwork adopts wood formwork or composite steel formwork, and the geometric size should not be less than the design value. The steel bars must meet the requirements of rigidity and stability. The formwork shall not operate and expand when concrete is poured.
7. Concrete pouring
The concrete should be symmetrical and layered, and the thickness of each layer should be controlled by 25-30cm. It should be constructed with a plug-in vibrator. Master the initial sett time of concrete, ensure the joint quality of the concrete level, and realize the pouring of the mid-suspension form, instead of pouring concrete, adding concrete.
When the concrete strength reaches 2.5mpa, it can be removed. Water evenly when sprinkling, or use polyester film to keep moisture and keep warm for 7 days.
8. Basic backfill
The foundation concrete cannot be constructed before the design strength reaches 75% or above. Ensure that the substrate is not damaged, strive for symmetry, layered backfill, and use impact compaction.
9. Clean the threaded bolt of the embedded parts of the foundation and install the light pole
Use cranes, special locks (sliding, sturdy, easy to unload and unload), ropes, control lifting points (1/3 of the height of the pole), and no more than 4 winds can be installed. Use dry hard mortar or thin steel plate for leveling, use the vertical ball method to find a suitable one, and install the fixing screws immediately after standing.