What are the types of cast in situ monolithic reinforced concrete floor slabs?

According to its different construction methods, reinforced concrete floor slabs can be divided into three types: cast-in-place, prefabricated and assembled monolithic.

The cast-in-situ monolithic reinforced concrete floor slab is at the construction site after the completion of the wall of the building.

A form of floor slab in which formwork is erected, steel bars are tied, concrete is poured, and the wall is connected into an integral part of the floor. The corresponding is the prefabricated reinforced concrete floor slab, which is prefabricated in the factory with a fixed size of reinforced concrete prefabricated slab, and then transported to the construction site for assembly to form the floor slab.

Basic role. Reinforced concrete structure.

The main load-bearing elements are built with reinforced concrete. Including thin shell structure, large formwork cast-in-place structure and the use of sliding formwork.

Buildings of reinforced concrete structures constructed by lifting slabs and so on. A structure made of steel and concrete. The steel bar is subjected to tensile force, and the concrete is subjected to pressure.

It has the advantages of being strong, durable, good fire performance, saving steel and low cost than steel structure. It is made of reinforced concrete elements that are pre-made in a factory or construction site and assembled on site.

The above content reference: Encyclopedia - cast-in-place reinforced concrete floor slab.

It can be divided into one-way plate and two-way board.

The characteristics of cast-in-situ reinforced concrete floor slabs are high overall stiffness, which is conducive to seismic resistance, large wet working area, high labor intensity (more human resources required), many processes, and long construction period.

Scope of application: 1. It is suitable for medium and high-rise buildings with high overall requirements.

2. It is suitable for buildings with irregular layout and does not meet the requirements of building modulus.

3. It is suitable for buildings with more floor pipelines passing through.

1. Reinforced concrete cast-in-place floor slab:

When the spacing of the load-bearing wall is not large, such as the kitchen room and toilet room of the residence, the reinforced concrete floor slab can be directly placed on the wall, without beams and columns, the span of the plate is generally 2-3 meters, and the thickness of the plate is about 70-80mm.

2. Reinforced concrete ribbed floor:

Also known as beam-slab flooring, it is the most common form of cast-in-place flooring. It is composed of the main board, the secondary beam and the main beam. The main beam can be supported by columns and walls.

The plates, ribs, main beams and columns that are all cast in situ as a whole after the formwork is supported. Its general span is 60-80mm thick.

3. Beamless floor slab:

It is a flat plate of equal thickness directly supported on a column with a column cap, and there are no main beams and secondary beams. The structure facilitates daylighting and ventilation, facilitates the installation of pipes and wiring, and reduces the height of the building under the same headroom conditions. Its disadvantage is that the stiffness is small, which is not conducive to bearing large concentrated loads.

4. Slab floor:

A slab that is cast in situ into a slab (without beams) and supported directly on the wall. It is the simplest form and is suitable for rooms with smaller floor plans, such as kitchens and bathrooms in mixed-structure homes, as well as corridors in public buildings. According to the surrounding support situation and the ratio of the length of the short side of the slab plane, the slab floor slab is divided into one-way slab, two-way slab, cantilever slab, etc.

5. Prefabricated reinforced concrete floor slab:

The use of this kind of floor slab is to divide the floor slab into beams, slabs and several components, prefabricate them in the prefabrication plant or construction site, and then install them. The advantage is that it can save the formwork, improve the labor conditions during production, and speed up the construction progress; But the integrity is poor, and requires a certain amount of lifting parade installation equipment. With the improvement of building industrialization, especially the large number of prestressed concrete technology, its application will become more and more extensive.

There are three types of integral reinforced concrete floor slabs: cast-in-place integral, assembled integral, and prefabricated assembly.

1.Cast-in-place monolithic.

Meaning: That is, all components are supported by on-site formwork, on-site pouring of concrete, and on-site maintenance.

Advantages: good integrity, large stiffness, good seismic and impact resistance, good waterproofness, strong adaptability to irregular planes, easy to open holes.

Disadvantages: A large number of templates are required, the amount of work on site is large, and the construction period is also long.

2.Prefabricated and prefabricated.

Meaning: That is, the components are first made in the factory or prefabrication yard, and then installed on the construction site.

Advantages: It can save the formwork, improve the construction conditions during production, improve labor productivity, and speed up the construction progress, and disadvantages: poor integrity, stiffness, and seismic performance.

3.Assemble monolithically.

Meaning: The assembly integral type is also called the prefabricated type, that is, after the prefabricated slabs, beams and other components are hoisted in place, the reinforced concrete is poured on it or at the junction with other parts to form a whole, so that the assembly integral type is formed.

Features: The integrity and seismic resistance of the assembly type are between the other two. Template consumption and bulk production fall somewhere in between.

Hope it helps

What is a cast-in-place reinforced concrete floor slab? What are the classifications?

1. The Bannianling annihilated floor slab is roughly a one-way slab and a two-way slab. 2. The well-punching floor slab is usually directly used to bear the load of the floor slab carried by the transverse and longitudinal double beams. 3. Ribbed floor slabs are usually used in the case that the beams are designed in the floor slab.

4. Beamless floors are generally rectangular or square beamless floors. 5. The steel plate floor slab is mainly made of a combination of profiled steel plate and concrete. 2. Precautions for cast-in-place concrete in rural housing construction 1. If the concrete mix ratio is not suitable, there are more stones and less cement mortar.

Concrete should be formulated with stones and sand of different particle sizes to fill the voids with each other to minimize the porosity of the concrete and improve the compactness of the concrete. 2. Before the concrete is poured, the various elements of the formwork, such as sawdust, plastic, broken bricks, etc., are not removed, which will cause the concrete surface to be damaged when the formwork is removed.

Flat plate: Solid flat plate is generally used for small span (about 1500mm), and the thickness of the plate is 60mmThe flat plate surface is flat up and down, and the production is simple, but the dead weight is large and the sound insulation effect is poor.

It is often used as walkway slabs, toilet floor slabs, balcony slabs, canopy slabs, pipe trench covers, etc.

Grooved plate: a non-prestressed grooved plate with a span length of 3-6m, with a high rib height of 120-240mm and a plate thickness of only 30mmThe trough plate reduces the weight of the plate, and has the advantages of saving materials and making holes in the board, but the sound insulation effect is poor.

Trough slabs are placed upright (rib down) and are often used as floor slabs for kitchens, bathrooms, warehouses, etc. When there are requirements for thermal insulation and sound insulation of the floor slab, the inverted (rib up) trough slab can be considered, and the trough can be filled with lightweight materials.

Hollow slab: According to the stress situation, combined with the requirements of sound insulation, and make the plate surface flat up and down, the prefabricated slab can be made into a hollow slab, and the holes are rectangular, square, round, oval, etc. Rectangular holes are more economical but difficult to draw holes, and circular holes have better plate stiffness and are more convenient to make, so they are widely used.

At present, the span size of China's prestressed hollow core slab can reach 6, etc., and the thickness of the plate is 120-240mm