One: the steel structure is paved with plywood, pine, large core board and bamboo veneer. My understanding of several kinds of plates; Plywood is not suitable for deformation and the standard cost of size is slightly higher than other plates; Pine boards are easily deformed when they are wet; The large core board is not environmentally friendly; Bamboo offset printing is also possible, but there is no one on the market that is too thick, and it is a bit drumming when stepping on it; It is recommended to use glulam.
Two: cast-in-place concrete. Its construction requires the wall to have enough bearing capacity, because of its great self-weight, which is generally used in public places and families for less. Many secondary structures are non-load-bearing, so it is suggested to use steel structure, so that columns can support them more firmly in the position of non-load-bearing walls. ?
Three: At present, most owners adopt steel-concrete combination (steel structure is paved with steel plates and concrete is made). Features: Good sound insulation effect;
Design instructions? ：
1、? This structural design is in accordance with the light steel structure design and conforms to the national light steel structure design code. ?
2、? The main girder of steel structure adopts (12#, 14#, 16#,) I-beams. The main girder and the embedded parts are fully welded in 360 degrees, and they are reinforced by the connection between the anchor bolts and the wall. After the completion of the main body of steel structure, brush the antirust paint twice. The main girder is floated by profiled steel plate, and the upper part is composed of 8# steel bar and 6# wire rod with high strength mesh lacing. The ceramsite concrete filled in it floats 5 cm. ?
3、? According to this structure, the seismic coefficient is 8 degrees and the service life is over 70 years. ?
4、? Code for Design and Construction of Steel Structures (GBJ500 17-2003)
Code for construction of high-strength bolt connection of steel structures: (JCJ82- 19)?
Main load: bearing capacity of high-strength bolts: 3.5 tons/root (diameter:? 12mm？ )?
Live load: 0. 15n/㎡. ?
5. According to the requirements of steel structure design code, what is the fire resistance limit range in this design scheme? 450℃? ~? 650℃? Time limit is about 60 minutes. Exceeding the limit range will cause structural damage and affect normal use. ?
Steel structure construction scheme?
First,? Main materials: (12#, 14#, 16# ...) I-beam 10# rebar, 6# wire rod, bearing plate, 16# chemical anchor bolt, special antirust coating for steel structure. ?
Second,? Process flow:?
Determination of embedded parts * Determination of actual elevation on site (determination of length of main beam and secondary beam) * Processing of frame (contact) * Fixing of main beam * Fixing of secondary beam * Welding of plate surface * Steel mesh reinforcement * Pouring of lightweight ceramsite concrete * Acceptance of main structure * Rust removal and rust prevention (fire prevention). ?
Third,? Construction specification:?
1、? Determination of embedded parts: firstly, remove the wall skin, expose the embedded parts, and determine their specific position and size, which will be the basis for the blanking and connection of the main girder. When removing the wall skin, remove it according to the mark of the original wall surface to avoid unnecessary wall skin falling off, and the embedded parts should meet the design requirements. ?
2、? Site elevation determination: determine the elevation according to the specific position of embedded parts. If the site elevation is different from the original design, the design department of the company must be asked for instructions, and the construction can only be started after the secondary design scheme is determined and the site elevation is leveled.