Century homes residential buildings in Wuhan is located in Jiang an District of Wuhan City, is by the Wuhan Shanley real estate development company, Zhejiang Hangxiao Steel Structure Co., Ltd., the construction of the steel structure residential projects, building 11, 22-24 floor of high-rise steel structure residential, a total construction area of 260000 square meters.
Approached the high-rise buildings, if not some people told this is a steel structure residential, from the appearance of it is difficult to see what is different from the traditional building.
"The same construction area of our house to some of the big," "the winter is not cold summer is not hot, live in a comfortable", visited the district residents, hear the most is personal feelings.
"Wuhan century residential home steel structure residential projects applied Hangxiao a number of new achievements in research and development, which the biggest bright spot is new CCA slab grouting wall, cold high frequency welded rectangular concrete filled steel tubular column and high-frequency welding of H shaped steel beam applications." Hangxiao, deputy chief engineer Li Wenbin told reporters.
From the floor system, the structure system, the wall system three aspects, Li Wenbin for our detailed anatomy of the steel structure, from the differences in understanding steel structure.
First, the steel structure residential floor system is different?
Different to the traditional construction methods of cast-in-place concrete floor, Hangxiao steel development out "truss reinforced steel building bearing board", is the floor of reinforced concrete in the factory processed into steel truss and steel bar truss and galvanized pressure type steel plate welded into one of the combination templates. At the construction site, the laying of the steel beam, a small amount of additional reinforcement lashing, concrete pouring, forming steel truss concrete slab.
"Through the practice of Wuhan century homes, residential construction, we put steel truss concrete slab summed up as one of the top ten advantages", Li Wenbin one by one count: a site binding to reduce the workload of the 60% ~ 70% can be further shortened. Two, about 50mm less than the thickness of ordinary steel deck concrete composite slab of concrete, reduce the dosage, interior height increased. Three, the stud welding quality is easy to ensure. Four, the bottom surface is flat, the feeling is good, the steel plate loss is less. Five, the mechanical properties and cast in place floor slab is basically the same, the use of the end of the plate is basically no cracking. Six, the fire performance of the cast in place floor is quite, the steel plate is not involved in the use of the stage, without considering the corrosion problem. Seven, the arrangement of the reinforced bar is uniform, and the thickness of the protective layer is reliable. Eight, by changing the height of the truss to the larger span of the floor. Nine, the floor is similar to the two-way stiffness, is conducive to building seismic, but also can be made into a two-way plate. Ten, the stress mode of the truss is reasonable, and the comprehensive cost is low.Two is the bearing capacity, saving steel. CFST members under axial pressure, concrete due to the confinement effect of the steel tube in three state of compression, the strength obtained further improved; and the presence of concrete can also delay or avoid the premature thin-wall steel tube of the partial yield, makes the steel bearing capacity could be brought into full play. The combination of the two, learn from each other. Under the condition of the same bearing capacity, the steel pipe concrete column is much less than that of pure steel.
Three is the plastic deformation capacity enhancement, the seismic performance is good. Concrete is brittle, and high strength concrete is more so. But if the concrete is poured into the steel tube to form a steel pipe concrete, at home and abroad test results table incidentally, concrete core under the restriction of steel tube. It not only improves the use phase of the elastic properties, and in the destruction with large plastic deformation, improve the building energy dissipation capacity; steel tube in concrete work, the stiffness of joint area is large, shear force, to avoid pure steel column under major earthquake prone to shear faults; under strong earthquakes, is easier to meet strong column and weak beam seismic mechanism of requirements.
Four is the anti side stiffness. Compared with the pure steel frame, the lateral force of the concrete filled steel tube column frame is large, the lateral displacement is small, the comfort is good, and the effect is small, the stability is good.
Five is a good fire performance. When the fire, the concrete absorbs heat, so that the steel tube structure is better than the pure steel structure with better fire resistance, can reduce the cost of fire prevention.
Six is the site construction, easy installation. Compared to compared with the reinforced concrete column, using concrete filled steel tubular column does not need assembling reinforcement, formwork and stripping process; with the pure steel column, steel pipe wall thickness is thin, light weight, convenient transport and hoisting.
Once again, the steel structure residential wall system is different?
The difficulties of steel structure residence in the wall, different from the traditional wall, CCA overall grouting wall is in Jharkhand CCA board panel, with light steel keel for the column, in the inner part of the cavity pumping concrete and the formation of
Secondly, what is the difference of the structure of the steel structure residential structure system?
Different from the traditional concrete structure, the engineering structure system uses the high frequency welded rectangular steel tube concrete column frame concrete tube body system, in the cylinder body to set up the steel column, steel beam.
High-frequency welded rectangular steel tube is strips of a certain width, under the condition of normal temperature after a group of longitudinal arrangement of roll, gradually deformed and reach the applicable requirements of size, and then by high-frequency welding and has closed sections of steel products, is currently China s three kinds of H type steel type that hot rolled H-shaped steel, welding H-beam and the high frequency one of H type steel welding, with section modulus is big, bearing force, convenient manufacture etc..
Li Wenbin told reporters, the six major advantages of the high frequency welding torque (square) - shaped steel tube concrete column:
One is the quality of stability. Compared to the material is welded by the four plates of rectangular steel tube, Cold-Formed Welded square tube is only a full-length welding, welding deformation range of influence is small, stable welding quality and material loss.
Two is the bearing capacity, saving steel. CFST members under axial pressure, concrete due to the confinement effect of the steel tube in three state of compression, the strength obtained further improved; and the presence of concrete can also delay or avoid the premature thin-wall steel tube of the partial yield, makes the steel bearing capacity could be brought into full play. The combination of the two, learn from each other. Under the condition of the same bearing capacity, the steel pipe concrete column is much less than that of pure steel.
Three is the plastic deformation capacity enhancement, the seismic performance is good. Concrete is brittle, and high strength concrete is more so. But if the concrete is poured into the steel tube to form a steel pipe concrete, at home and abroad test results table incidentally, concrete core under the restriction of steel tube. It not only improves the use phase of the elastic properties, and in the destruction with large plastic deformation, improve the building energy dissipation capacity; steel tube in concrete work, the stiffness of joint area is large, shear force, to avoid pure steel column under major earthquake prone to shear faults; under strong earthquakes, is easier to meet strong column and weak beam seismic mechanism of requirements.
Four is the anti side stiffness. Compared with the pure steel frame, the lateral force of the concrete filled steel tube column frame is large, the lateral displacement is small, the comfort is good, and the effect is small, the stability is good.
Five is a good fire performance. When the fire, the concrete absorbs heat, so that the steel tube structure is better than the pure steel structure with better fire resistance, can reduce the cost of fire prevention.
Six is the site construction, easy installation. Compared to compared with the reinforced concrete column, using concrete filled steel tubular column does not need assembling reinforcement, formwork and stripping process; with the pure steel column, steel pipe wall thickness is thin, light weight, convenient transport and hoisting.
Once again, the steel structure residential wall system is different?
The difficulties of steel structure residence in the wall, different from the traditional wall, CCA overall grouting wall is in Jharkhand CCA board panel, with light steel keel for the column, in the inner part of the cavity pumping concrete and the formation of composite integral solid wall.
Li Wenbin summed up their advantages in four ways:
First, energy saving and environmental protection. CCA board is the main raw material of sand, grouting material mainly composed of sand, fly ash, EPS particles, cement are mixed according to a certain proportion and, these raw materials mining and utilization will not cause the destruction of ecological resources, all the components of the material does not contain harmful substances, no radiation, green environmental protection and keel can be smelting recovery, the strength of grouting material is not high, the crushing treatment and cyclic utilization. Jharkhand CCA board grouting wall thermal conductivity is low, 600 density grade of EPS concrete grouting, 200 thick CCA board grouting wall heat transfer coefficient 0.96, equivalent to 600mm of thickness of brick wall energy-saving effect significantly, in line with the current development green building and clay bricks restrictions to save the situation of cultivated land resources in.
Second, saving material. Wuhan century, the total area of 80632.6 square meters of the home wall, using 200mm thick CCA plate grouting wall. If the traditional clay, according to 60 million bricks destroyed 1 mu of cultivated land, per million pieces of brick consumption of 1 ton of standard coal to calculate, you can replace 11 million piece of clay brick, equivalent to saving about 18.4 acres of arable land, saving about 1100 tons of standard coal.
Third, performance and cost-effective. Wuhan century Jiayuan residential facades were treated with CCA board with high density and thickness of 10mm; inside the medium density CCA board, the thickness of 8mm; between two layers of CCA in irrigation 600 density level of EPS concrete, thickness of 200mm; after the national building materials testing center testing, the CCA board filling slurry wall is equivalent to 600 mm thick brick walls, so the effective use of space.
Due to the solid walls, and the main structure adopts elastic connection and CCA board grouting wall has a good seismic performance and solid walls to the good nail holding power to solve the deficiencies in hanging light light body.
Because of its light weight, the CCA board is light wall, which can reduce the cost of foundation and structure, and is a kind of high quality wall which is matched with the steel structure system.
Fourth, construction speed. CCA board grouting wall in the construction and installation, the operation is simple, fast. Because the wall is good, the wall is formed, and it can have a very good appearance without the decoration engineering. Compared with the block wall plastering, save. Due to the CCA board amplitude is higher, so with the current use is widely GRC slat compared, greatly reducing the seam stitching, which not only saves the joint material and labor costs.