Machines and equipment, such as mixers, transport vehicles, hoppers, drums, vibrators, etc. Make full preparations as required, and consider the repair time in case of failure. For important projects, there should be spare mixers and vibrators. Especially when pumping concrete, there must be a spare pump. Before pouring, all machines and tools used shall be inspected and tested, and full-time technicians shall be equipped for maintenance at any time. Before pouring, it is necessary to verify the engineering materials that have been poured at one time or before pouring to a construction joint to avoid shutdown.

Preparation scheme for concrete pouring construction of building engineering;

1. Make a construction plan

According to the engineering object, structural characteristics, combined with specific conditions, the construction scheme of concrete pouring is formulated.

2. Machine preparation and inspection

Machines and equipment, such as mixers, transport vehicles, hoppers, drums, vibrators, etc. Make full preparations as required, and consider the repair time in case of failure. For important projects, there should be spare mixers and vibrators. Especially when pumping concrete, there must be a spare pump. Before pouring, all machines and tools used shall be inspected and tested, and full-time technicians shall be equipped for maintenance at any time. Before pouring, it is necessary to verify the engineering materials that have been poured at one time or before pouring to a construction joint to avoid shutdown.

3. Ensure the supply of water, electricity and raw materials

During concrete pouring, water, electricity and lighting shall be guaranteed uninterrupted. A certain amount of raw materials (such as sand, stone, cement, water, etc. ) and artificial mixing tamping tools should be stored in the casting site in advance to prevent accidental construction shutdown.

4. master the seasonal changes of the weather.

Strengthen the liaison work of meteorological forecast. In the concrete construction stage, it is necessary to master the weather changes, especially the thunderstorm, typhoon season and the sudden attack of cold current, so as to ensure the smooth and continuous pouring of concrete and the quality of concrete.

According to the needs of the project and the characteristics of seasonal construction, necessary pumping equipment and materials such as rain protection, heatstroke prevention and cold protection should be prepared during pouring.

5. Check the templates, supports, steel bars and embedded parts.

Before pouring concrete, the size, specification, quantity and position of formwork, reinforcement, protective layer and embedded parts should be checked and controlled, and their deviation values should comply with the current national standard "Code for Acceptance of Construction Quality of Concrete Structure Engineering" (GB 50204). In addition, check the stability of formwork support and the tightness of formwork joints.

Template engineering and concealed engineering projects should be pre-checked and concealed acceptance respectively. You can pour it when it meets the requirements. Attention should be paid to the following points during inspection:

(1) Whether the elevation, position and section size of the template comply with the design; Whether the reserved camber of the component is correct;

(2) Whether the installed bracket is stable; Whether the support of the pillar and the fixation of the formwork are reliable;

(3) the tightness of the template;

(4) Whether the specifications, quantity, installation position and contact weld of steel bars and embedded parts comply with the design.

Before pouring concrete, trash, sawdust, shavings, sawdust, oil stains and scale on soil and steel bars should be removed.

Wooden formwork shall be wetted with water, but no water is allowed. After wetting, the unexpanded gaps in the wooden formwork should be glued firmly to prevent slurry leakage.

Gaps and holes in the metal formwork should also be closed.

Check whether the safety facilities and labor equipment are suitable and can meet the requirements of pouring speed.

6. Others

When pouring concrete on the foundation or foundation soil, silt and sundries should be removed, and drainage and waterproof measures should be taken.

For dry cohesionless soil, wet it with water; Unweathered rocks should be washed with water, but there should be no water on their surfaces.