I. Technical principle
1. The floor not only plays the role of dividing floors, but also acts as a structural stress member to bear the vertical floor load. For the reinforced concrete slab member as the structural stress, the hollow slab is formed by hollowing out the middle part of the slab thickness, which does not affect the bearing capacity of the slab. While greatly reducing the floor weight and concrete consumption, due to the reduction of load, the consumption of steel bars is also significantly reduced, thus achieving the purpose of saving materials and costs.
For the conventional floor, with the increase of span, the thickness of the floor needs to increase correspondingly, and the thickening of the floor leads to the further increase of its own weight, which limits the mechanical properties and economy of the long-span floor. Therefore, the economic span of conventional structural floors is usually 3-4m.
2. After adopting the cast-in-place hollow floor technology, it not only maintains the characteristics of continuous mechanical properties and good stiffness in the plane of the conventional floor, but also has the advantages of large thickness, good stiffness and light weight of the out-of-plane structure. It is a large space structural member with light weight, large span, material saving, low cost and excellent mechanical properties.
Second, technical advantages
1, which meets the needs of large span, large load and large space, and its economic span is 8-12m;
2. The basement is more economical, and the comprehensive cost can be saved by10-20%;
3, the structure is light in weight, which can reduce the basic cost;
4, save materials, in the case of large span can save 10-30%, steel bar 30-50%, template more than 50%.
Third, the scope of application:
Underground garages, civil air defense projects, shopping malls, hotels, office buildings, schools, libraries, archives, museums, theaters, stadiums, apartments, villas, commercial real estate skirts, factories, warehouses and other long-span buildings.
4. The patented technology of reinforced concrete hollow floor with built-in lightweight materials and its construction method have the following advantages in building construction:
1, which is convenient for construction, saves templates and shortens the construction period.
2, energy saving, heat insulation and sound insulation, and the building quality is greatly improved.
3. Functions and advantages of hollow floor.
(1) saves the construction template and the plastering of the beam side.
(2) Accelerate construction.
(3) Reduce smoke and spray.
(4) The length of vertical hydropower, air duct, elevator and other components is saved.
⑤ Shorten the length of lanes and increase the use area of parking spaces.
⑥ Convenient pipeline installation.
4. Functions and advantages of hollow floor.
(1) excellent use function
② Spatial elastic interval
③ Excellent sound insulation effect.
④ Good fire prevention, heat insulation and heat preservation performance.
⑤ The construction is economical and convenient.
⑥ The hollow position is accurate, and the rebar positioning is accurate.
⑦ Convenient pipeline arrangement
5. Economic advantages of underground hollow floor slab (cost saving 200 yuan/㎡)
(1) The earthwork excavation and transportation volume of foundation pit excavation are greatly reduced, and the backfill earthwork is also reduced accordingly.
(2) The quantity of foundation pit arm is obviously reduced, and there are many supporting methods for foundation pit, such as cantilever pile, anchor pile and internal support. After using the hollow concealed beam floor, the excavation depth of foundation pit becomes smaller, the earth pressure and water pressure decrease, the pile depth and buried length shorten by 13%, the pile diameter decreases, the pile reinforcement decreases, and the number and length of anchor rods and the number and size of internal support members are also saved.
(3) Foundation pit floor: when the excavation depth of foundation pit is less than 1m, the water level of basement is also reduced by 1m, the water pressure is reduced by 10kn/m2, the load of foundation pit floor and foundation beam is reduced by 10kn/m2, and the reinforcement, section and waterproof grade are also reduced.
(4) uplift piles: When uplift piles are needed due to high groundwater level, the buoyancy is reduced, and the number and length of uplift piles are also reduced.
⑤ basement exterior wall: hollow floor can reduce the height of floor and exterior wall, and the earth pressure, water pressure, thickness and reinforcement of exterior wall are also reduced accordingly.
⑥ Lane slope decreases.