Do you use grid or prestressed concrete beam slab structure for roofing?

If a large space is required under the roof and there are no columns, it is recommended to use the grid structure, although the beam plate structure also has a lattice beam or ribbed beam can do a larger span, but it is still incomparable with the grid.

However, if you want to make a roof for the master, it is better to use a beam and plate structure.

Note: There are two key points for making a choice: span, whether it is on the roof).

The prestressed concrete beam and slab structure is only a kind of beam and slab structure, so if the span is not too large and the roof needs to be mastered (the master here not only refers to the person who can be used for construction or maintenance, but also includes the building user), then after choosing the beam and plate structure, then consider whether it is ordinary concrete or prestressed concrete.

Let's talk about the advantages and disadvantages of prestressed concrete compared with ordinary concrete.

Advantages: 1. Good crack resistance and high stiffness.

2. Save materials and reduce dead weight.

3. Improve the shear resistance of components.

4. Improve the stability of compressive components.

5. Improve the fatigue resistance of components.

Disadvantages: 1. The process is more complex and has high quality requirements, so it needs to be equipped with a skilled professional team.

2. There is a need for certain special equipment, such as tensioning machines, grouting equipment, etc.

3. The starting cost of the prestressed concrete structure is larger, and the engineering cost of the small number of components is higher.

Of course, there is such a situation, the span is moderate, and not on the person, so it is okay to do beams and plates, and it is okay to do grids, maybe it is necessary to compare the cost of the two with other aspects.

Then I can give you a few data, the cost of a 900-square-meter grid in a building is about 380,000, which is equivalent to about 40,000 per 100 square meters; In fact, if the beam and plate structure is properly designed, 100 square meters is almost less than 40,000.

But with a larger span, the beam and plate structure will not be able to bear it. Can you imagine that in such a large space, there are large concrete beams of more than one or two meters across it? This is not only unsightly, but also reduces the headroom of the room.

Hopefully, some of what I've said above will be useful to you. The choice is still up to you.

It depends on the nature of the use of the house, the advantage of the grid is that it can do a large span such as 40m, 60m, and there is no column in the middle, how good it is! The cost may be cheaper, if it is a public building, it can also be without a suspended ceiling, and it is also good-looking, but the disadvantage is that it needs to be painted once in a few years. The advantage of stressing concrete structure is that it can be used on the roof.

What are you talking about, I don't know if I fell asleep when the teacher lectured in college or the teacher deliberately didn't talk about it, what is the structure of the grid??? What is the substructure of prestressed concrete beam slab?

The roof concrete structure on the building only has reinforced concrete cast-in-situ slabs and prestressed hollow slabs.

The prestressed steel structure is better than the grid.

It depends on the project, and I personally recommend the grid structure or light steel roof.

<> about the grid construction technology of roof load-bearing structure? If you want to know the answer, the following is the relevant content of the grid construction technology of the roof load-bearing structure sorted out by Zhongda Consulting, and the basic situation is as follows:

The grid is a spatial structure formed by connecting the nodes of the multi-travel root members according to a certain grid form. In the process of hoisting, the grid is considered to be mainly hoisted by tower cranes, supplemented by truck cranes.

Grid structure construction technology: drawing deepening design, material ordering, rod and bolt ball production, steel component transportation, full scaffolding erection, measurement and pay-off positioning, steel member, steel component assembly, steel component welding, inspection, painting, completion acceptance.

Grid installation sequence:

1. Use computer three-dimensional modeling to carry out computer lofting.

2. According to the coordinate size of the three-dimensional modeling of the electronic computer, the fixed tire mold base is welded.

3. Locate the chord and web rod on the assembled tire mold base, and spot weld and fix it.

4. After the web rod spot welding is completed, the welding is carried out after inspection.

Quality control of grid installation: the high-strength bolts of the bolt ball node should be tightened in place, and no gaps can be observed by the naked eye on the contact surface of the sleeve; The surface of the installed grid parts is clean, complete, not damaged, not dented, not well installed, the number is accurate, and the wrong installation is found to be replaced in time; After the installation of the steel grid structure is completed and the roof is completed, the deflection value is measured respectively, and the measured deflection value should not exceed the value of the phase design.