Steel bar concrete precast floor slab

Abstract

The invention relates to improvement of the traditional steel bar concrete precast floor slab, which is characterized in that the upper surface layer and the lower surface layer of a precast concrete hollow floor slab are internally provided with a two-way steel bar framework, an upper and lower layer connecting steel bar concrete ribs consisting of a vertical steel bar connecting steel bars of the upper surface layer and the lower surface layer and wrapping concrete is arranged between the upper surface layer and the lower surface layer; heat insulation and sound insulation materials are filled between the two steel bar concrete ribs; two sides and two ends of the floor slab in an axial direction are both provided with connecting steel bars and side wings of the extending thickness less than the thickness of the floor slab; and shelf beams at two end parts of the floor slab are internally provided with transverse steel bar frameworks forming beam structures and anti-shearing diagonalsteel bars connecting the steel bars at the lower surface layer. The precast floor slab integrates the advantages of the precast floor slab and the cast-in-place floor slab, overcomes all defects of the precast floor slab and the cast-in-place floor slab, especially has small cast-in-place construction workload and high construction speed, can meet requirements of the construction for rapid operation, materials saving and no pollution in an assembled building, accords with the development direction of the building industrialization production, and has high earthquake resistance of the cast-in-place floor slab.

Description

technical field [0001] The invention relates to a factory prefabricated and on-site assembled reinforced concrete prefabricated floor slab, which is an improvement to the existing reinforced concrete prefabricated floor slab. Background technique [0002] Commercial and residential buildings have the largest floor construction workload. Floor construction, one is prefabricated in the factory and shipped to the site for installation; the other is cast on site. Prefabricated floor slabs save materials, ensure quality, fast construction speed, less wet work on site, good construction environmental protection, and are favored, but the original various prefabricated hollow slabs (such as commonly used porous type ribbed floor), the main disadvantages are: the first prefabricated floor is surrounded by straight edges, the lack of a solid overall connection between the floors, the combined integrity is extremely poor, and the earthquake resistance is poor; the second floor is susc...

AI Technical Summary

Problems solved by technology

Prefabricated floor slabs save materials, ensure quality, fast construction speed, less wet work on site, good construction environmental protection, and are favored, but the original various prefabricated hollow slabs (such as commonly used porous type ribbed floor), the main disadvantages are: the first prefabricated floor is surrounded by straight edges, the lack of a solid overall connection between the floors, the combined integrity is extremely poor, and the earthquake resistance is poor; the second floor is susceptible to thermal expansion and contraction, resulting in cracks in the surface layer Cause water seepage; three no insulation, sound insulation; four fixed length fixed width, poor adaptability to changes in building length

It only solves the heat insulation and sound insulation of the floor, and does not solve other shortcomings

[0006] The above-mentioned prefabricated floor slabs only proposed a single improvement for a shortcoming of the prefabricated floor slab, and did not solve all the shortcomings of the prefabricated floor slab as a whole.

[0007] Chinese patents CN2102963, CN2747298, and CN2747299 reinforced concrete hollow prefabricated component panels have transverse protruding blocks and protruding connecting steel bars at the bottom of both sides, adjacent assembled steel bars are lapped, and the grooves between the two floors are filled with concrete, which improves Only the integrity of the horizontal combined connection between floors, other shortcomings of prefabricated floors have not been overcome

[0008] Chinese patent CN2778930 reinforced concrete hollow prefabricated member slab, with protruding platforms and connecting steel bars at the bottom of both ends of the floor slab, which only improves the integrity of the axial combination, and other shortcomings of the prefabricated floor slab have not been overcome

In fact, the width of the building beam is usually only 220-250mm, and the end of the floor is only about 80-100mm. If a thin plate protrudes from both ends, it will affect the force on the end of the floor and become a weak point of the structure. At most, it can only be used for small load-bearing loads and Light slabs with a width of less than 1 meter

[0009] The cast-in-place floor slab has good overall structure, strong earthquake resistance, and no water seepage. The main disadvantages are: the cast-in-place floor slab requires on-site formwork and on-site pouring. The formwork can only be removed after hardening, and the natural hardening and maintenance period of concrete is long, which leads to a long construction period on site and poor environmental protection; and the quality assurance of site construction is poor, building materials and auxiliary materials are wasted, and the actual floor cost is much higher than that of prefabricated floors.

[0012] It is objectively shown by the many existing technologies mentioned above that although people try to solve the problems of floor construction and earthquake resistance through various efforts, they only solve a certain deficiency in the prior art, and do not comprehensively solve the prefabricated floor and cast-in-place of the prior art. The deficiencies in the floor slabs realize the advantages of both prefabricated floors and cast-in-place slabs, overcome all the shortcomings of both, and cannot meet the requirements of fast, economical, and pollution-free construction of prefabricated buildings, resulting in objectively not being accepted by the market. The above-mentioned shortcomings are still There is room for improvement

Images