What is a prefabricated slab and what is the difference between cast in place and precast slabs?

Prefabricated panels. It is the floor slab used in early buildings. Prefabricated panels are modules or plates to be used in the project.

Because it is processed and molded in the factory, it is directly transported to the construction site.

The installation is carried out, so it is called prefabricated slabs [1].

When making prefabricated panels, first nail the hollow model with wooden boards, after laying steel bars on the hollow part of the model, fill the hollow part with cement, and knock off the wooden board after drying, and the rest is the prefabricated panel. Prefabricated slabs are used in many ways, such as cement slabs covered by ditches next to highways.

The cement slabs on the roof are all prefabricated panels.

There are two types of prefabricated panels: solid and hollow. The purpose of making hollow prefabricated slabs is simply because the hollow position of the slab is not stressed, so it is useless to pour concrete in the hollow place, so the place where the force is not stressed can be hollowed out, so as to achieve the purpose of reducing weight and saving cost. However, it is no longer advisable to use prefabricated hollow slabs, and the building structure is cast-in-place structure, which has the advantage of building a good integrity, that is, it is more solid.

Prefabricated slabs were the floor slabs used in early buildings.

Because it is processed and formed in the factory and directly transported to the construction site for installation, it is called prefabricated board.

The construction slabs of the project are all cast-in-place concrete, and there are few prefabricated slabs.

The so-called prefabricated slab refers to the pre-made floor slab, which can be used directly when building the building, and is generally used for the main body of the building

The prefabricated slab is the floor slab, that is, the roof on the top of the house is basically that, so after the swing, the building collapses and the person will be pressed by the prefabricated slab.

The prefabricated slab is in the project, the cast-in-place cement floor slab of the floor, it is a whole, when the building collapses, the entire prefabricated slab will be pressed down as a whole, and there are some steel bars sandwiched in the middle, which is difficult to remove! ~

Qingdao Lingyou prefabricated parts **** is to make prefabricated panels.

Which is better, cast-in-place slab or prefabricated slab, and what are their characteristics? Today is a long time to see.

Prefabricated slabs were commonly used in the ground floor buildings in the past, and now they are more commonly used in rural buildings. Its advantage is that it is very convenient and fast, because the prefabricated board has been done well before, that is, the space span is small, and it is easy to leak the roof due to sinking and other reasons after a long time. The cast-in-place board takes into account the span and is also a relatively large waterproof performance, but its disadvantage is that the construction period is relatively long and the cost is relatively high.

Prefabricated panels. It is the cement module to be used in the project orCement slabsBlock.

When making prefabricated panels, first nail a hollow model with wooden boards, then put steel bars in the hollow position of the model, then fill the hollow part with cement, and knock off the wooden boards after natural drying, and the rest is the prefabricated panels. What is the structure of a prefabricated slab house? Prefabricated slab houses belong to frame structures.

Prefabricated slabs can often be seen on buildings, such as cement slabs covered by ditches next to highways; Or a cement slab on the roof that is used as an insulation, etc.

Precautions for the decoration of prefabricated buildings

1. Try not to make a ceiling, only walk the line and scrape white. If you must make a suspended ceiling, try to choose lightweight materials and do not hit expansion screws.

Use wooden stoppers instead. This is based on the load-bearing aspects of the prefabricated slab floor slabs.

2. The living room and bedroom do not use marble, granite and other materials, but use floor tiles.

materials such as wooden flooring.

3. Pay attention to waterproofing in the kitchen and bathroom. After the waterproof layer is done, it should be tested first to confirm that there is no leakage before laying the floor tiles.

The above content refers to Encyclopedia - prefabricated board house.

Question 1: What is the prefabricated slab The prefabricated slab is the cast-in-place cement floor slab of the floor in the project, it is a leakage whole, when the building collapses, the entire prefabricated slab will be pressed down as a whole, and there are some steel bars sandwiched in the middle, which is difficult to remove! ~

Question 2: What is a prefabricated board? Prefabricated slabs were the floor slabs used in early buildings.

Prefabricated panels are modules or plates to be used in the project. Because it is processed and molded in the factory and directly transported to the construction site for installation, it is called prefabricated board [1]. When making prefabricated panels, the hollow model is nailed with wooden planks, and after the hollow part of the model is covered with steel bars, the hollow part is filled with cement, and then knocked after drying.

Question 3: What is a prefabricated board and what is it used for? Prefabricated slabs are the floor slabs used in early buildings Because they are directly transported to the construction site for installation after being processed and formed in the factory, they are called prefabricated slabs Precast slabs are the modules or plates to be used in the project.

When making prefabricated panels, first nail the hollow model with wooden boards, then lay steel bars on the hollow part of the model, fill the hollow part with cement, and knock off the wooden board after drying, and the rest is hungry board. Prefabricated slabs are used in many ways, such as cement slabs covered by ditches next to highways. The cement slabs on the roof are all prefabricated panels.

Question 4: What is prefabricated in architecture? Prefabricated panels. The version made in advance can be directly installed during construction, and there is no need to pour it on site.

Question 5: What is a prefabricated slab and what is the function of a prefabricated slab In construction projects, the prefabricated plate components are generally called prefabricated slabs.

Question 6: What does the pre-bending limb system mean in the form of floor slabs cast-in-place? The two refer to the construction method of the floor slab. Cast-in-place is at the construction site, poured on site with reinforced concrete, and prefabrication is basically prefabricated slabs (factory prefabricated floor slabs, on-site installation).

The ** below is the prefabricated slab floor slab after damage.

Below is the cast-in-place floor slab.

Question 7: What does prefabrication mean that it is done in advance, there are prefabricated beams and prefabricated piles on the building.

Question 8: What is the material of prefabricated slabs for building materials Generally reinforced concrete, the grade is low, probably C15, unless specially customized.

The steel bars are also generally thin and less, and they are replaced by iron wire.

Question 9: What is a prefab? Baoding Hongji Heyang will answer for you: the prefabricated parts are poured with concrete before construction, and an iron plate that can be welded can be exposed.

The prefabricated slab is an assembled structure, and the production process is uneven, when the first comes, the prefabricated slab may slip with the brick wall and the ring beam, if the strength is serious, the prefabricated slab even breaks and falls down, and the strength and load-bearing compressive resistance of the prefabricated slab can no longer meet the needs of the new building.

Cast-in-place slab refers to setting up a formwork on the site, installing steel bars on the formwork, pouring concrete on the formwork, and then dismantling the formwork. Compared with the prefabricated floor slab, the cast-in-place layer can enhance the integrity and seismic resistance of the house, and has a large bearing capacity. At the same time, it also has certain advantages in heat insulation, sound insulation, waterproofing and other aspects.

For example, a chopstick is easy to break, and a pair of chopsticks is not easy to break.

Because the cast-in-place slab is poured together with beams and columns, it is a whole, which can effectively reduce the resistance pressure brought by the first grade.

Second, practical function consideration: the difference between waterproof.

Due to the internal holes of the prefabricated slab, its waterproof performance is relatively poor, and if the floor slab seeps water, the downstairs will leak.

This is a problem that has plagued rural dwellings for many years.

The cast-in-place board is relatively tight, and due to its overall solid characteristics, it also plays a good blocking role in waterproofing.

3. So, is everything fine with cast-in-place slabs?

Compared with prefabricated slabs, cast-in-place slabs have obvious advantages, and can even be called "perfect", is this really the case?

A practical problem that cannot be ignored, some cast-in-place slabs will appear - cracks!

It not only affects the use function and damages the appearance, but also destroys the whole structure, reduces its stiffness, causes corrosion of steel bars, and affects the durability and durability.

Fourth, what are the causes of cast-in-situ slab cracks?

According to the field engineering observation, the causes of cracks in cast-in-place concrete floor slabs mainly include three aspects: materials, construction, and surrounding media.

1. Material factors: including cement varieties, mixed material varieties, aggregate varieties, concrete mix ratio, types and dosage factors of admixtures, as well as improper material selection.

2. Construction factors: mainly including improper preparation and pouring of concrete, improper formwork construction, improper concrete maintenance and other factors.

3. Surrounding medium factors: the lower the relative humidity of the air, the greater the shrinkage of concrete. As the air temperature increases, the shrinkage of the concrete increases. Long-term wind and sun exposure will also increase the shrinkage of concrete.

Which is better, cast-in-place slab or prefabricated slab, and what are their characteristics? Today is a long time to see.

It's pretty well understood literally. Cast-in-place is a concrete slab that is directly poured and formed on the structure. The prefabrication means that the pre-poured concrete slab is pre-poured on a flat site, and the pre-poured slab is transported to the construction site for installation after the progress of the project.

The cast-in-place slab is poured on site at the position of the finished product, which has the advantage of good connection with other structural components, and the operation technical requirements are low, but it occupies more time and space on the construction site. Prefabricated slate stone in the factory or special site in advance according to the design requirements pre-pouring molding, and then according to the finished product position, has the advantages of high efficacy, occupy the time of the construction site and less space, but the technical requirements are higher, and the requirements for construction organization and management are also higher, and the joints of prefabricated slabs and other components need to be well handled.

The cast-in-place slab is made of formwork, reinforcement and cast-in-place concrete at the elevation position of the floor slab on the construction site. It is often poured together with the beam, so that the integrity of the structure of the house is the best, and the stress condition of each component can be guaranteed to be closest to the design, which is conducive to the earthquake resistance of the house. Occupying the construction period and occupying the turnover material are its disadvantages; Prefabricated slabs are pre-produced in prefabrication factories and transported to the site for installation, and its advantages and disadvantages are basically the opposite of cast-in-place slabs, so I will not go into details.

When it comes to prefabricated panels, many people have never heard of them, but prefabricated panels are widely used in the construction industry and can be used in many places around us, such as roof insulation. So what is a prefabricated slab? Prefabricated panel specificationsWhat are they?

Let's take a look at it.

Prefabricated slabs are the materials used as floor slabs in early construction in China. Prefabricated slabs are plates or modules to be used in the project, because they are directly transported to the construction site for installation after being processed and formed in the factory, so they are called prefabricated slabs.

When making prefabricated panels, the wooden planks are nailed into a hollow model, and after the hollow part of the model is lined with steel bars, then poured with cement until the hollow part is filled, and then the wooden planks are knocked off after drying. Mingchang prefabricated slabs are highly used in the construction industry, such as cement slabs covered on ditches next to highways; The cement slabs on the roof are all prefabricated panels.

What are the specifications of prefabricated panels?

1. Span: The longest residential one is meters, not talking about the modulus, and it needs to be customized if it exceeds it.

2. The length of the plexus: generally according to the modulus of 300mm, such as 3000mm, 3300mm, 3600mm, 3900mm, 4200mm, but there are special ones such as 3800mm and 4000mm, but the longest ordinary plate is 4200mm.

3. Width: 400mm, 500mm and 600mm.

4. Thickness: the most common ones are 120mm and 150mm.

5. Bear live load level: generally the house can use two levels of plates, that is, the first plate and the second plate, the first plate is to say that the live load that can be borne is 1kn m2, and the second plate can bear the live load of 2kn m2. The southwest region has specified a minimum of four level plates, i.e. the live load that can be carried is 4kn m2.

That's all it brings to you: What is a prefabricated board? What are the specifications of prefabricated panels? All of it.

The prefabricated slab looks like this:The prefabricated plate is a module or plate to be used in the project, and the length is generally according to the modulus of 300mm, such as , but there are special such as , but the longest ordinary plate is 4200. The width is generally 400mm for four holes and 500mm for five holes.

Classification of prefabricated panels:There are two types of prefabricated panels: solid and hollow. The purpose of making hollow prefabricated slabs is simply because the number of wide covers is not stressed at the hollow position of the slab, so it is useless to pour concrete in the hollow place.

As a result, the place where the force is not stressed can be emptied, so as to achieve the purpose of reducing weight and saving cost. However, it is no longer advisable to use the pre-stuffing book hollow slab, and the building structure is cautious to use the cast-in-place structure, which has the advantage of building a good integrity, that is, it is more solid.