Assembled composite wallboard and floor slab self-tapping screw block and post-cast strip combined connection structure and construction method

Abstract

The invention discloses an assembly type composite wallboard and floor slab self-tapping screw block and post-cast strip combined connection structure and a construction method. The structure and the construction method are used for assembling upper and lower composite wallboards and floor slabs of a multi-story building bearing a large earthquake effect. The self-tapping screw set block comprises a linear self-tapping screw set block connected with upper and lower composite wall outer-leaf concrete thin plates, a T-shaped self-tapping screw set block connected with a lower inner-leaf concrete thin plate inverted-L-shaped ring beam, an upper inner-leaf concrete thin plate and a floor slab, and an inverted-L-shaped self-tapping screw set block connected with the floor slab. The self-tapping screw block steel structure is composed of a force transmission steel plate, a connecting steel plate and self-tapping screws which are welded to a steel bar. The post-cast strips comprise post-cast strips between the upper and lower outer-leaf concrete slabs and post-cast strips between the inner-leaf concrete slabs and the floor slabs; the problems that the interface of the concrete thin plate and the sandwich polystyrene plate is a connection construction blind area and a through screw is connected with a heat bridge are solved through self-tapping screw block connection. The method has the technical advantages that continuous force transmission of the post-cast strip and concentrated force transmission of the self-tapping screw aggregate work cooperatively and are efficiently stressed, and the thermal performance of the wall body is good.

Description

technical field [0001] The invention relates to a combined connection structure and method of an assembled composite wall panel and a floor self-tapping screw block and a post-casting belt, and belongs to the technical field of prefabricated concrete buildings. Background technique [0002] The technical research and development of ultra-low energy consumption houses has always been paid close attention to by the engineering community at home and abroad. However, at present, the construction technology of low-storey and ultra-low energy consumption houses in villages and towns, especially the prefabricated construction technology, is very lacking. [0003] Technical bottleneck: [0004] The connection problems of the upper and lower composite walls: (1) The traditional shear wall reinforcement structure has a large distribution spacing and a large diameter of the steel bar. If the steel bar is lapped and anchored, the height and size of the post-cast belt section will be la...

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Problems solved by technology

[0004] Connection problems of the upper and lower composite walls: (1) The traditional shear wall reinforcement structure has a large distribution distance and a large diameter of the steel bar. If the steel bar is lapped and anchored, the section height of the post-cast belt is large and the amount of cast-in-place is large, which is difficult to meet the internal and external requirements. The post-cast concrete section height required for the assembly of single-row reinforced mesh concrete thin-slab sandwich polystyrene board wall panels should not exceed the requirement of 180mm; (2) The traditional shear wall sleeve connection steel bar technology is not suitable for single-row steel bars at the inner and outer leaves For the assembly of polystyrene board wall panels with mesh concrete thin slabs, the thickness of the thin wall panels on the inner and outer leaves is only 40mm-60mm; Assembling the core polystyrene board wall panels, because the polystyrene boards are sandwiched between the inner and outer leaf wall boards and the thermal bridge problem is considered, the polystyrene boards are not allowed to drill holes through bolts, so it is difficult to separate the inner and outer leaf concrete thin walls by using the traditional steel plate bolt connection technology. Plate assembly; (4) The price of self-tapping screws is much lower than that of bolts. The light steel keel, the force transmission between the light steel keel is realized through the occlusion with the self-tapping nails, and there is no extrusion friction; however, the assembly of the inner and outer leaf single-row reinforced mesh concrete thin-slab sandwich polystyrene board wall panels belongs to the reinforced concrete wall Panel assembly requires both friction and occlusal force. It is obvious that the current self-tapping nails directly connecting light steel keel technology is significantly different from the assembly and force transmission requirements of the inner and outer leaf concrete thin wall panels of composite wall panels; (5) traditional shear For the assembly of force wall cast-in-place belts, due to the large amount of concrete cast-in-place and the large expansion force of concrete, it is necessary to add temporary construction supports to position the formwork, which is expensive and less flexible, and is not suitable for single-row reinforced mesh concrete on the inner and outer leaves Concrete post-cast belt construction of thin-slab sandwich polystyrene board wall panel

[0005] The problem of the connection between the composite wall and the floor: (1) The size of the single-row reinforced mesh concrete thin slab in the inner leaf of the traditional prefabricated sandwich polystyrene board composite wall panel is too small for the lap joint of the prefabricated floor, and the single-row reinforcement in the inner leaf There is a problem of thin slab stability when the thin slab transmits the floor load; (2) The traditional prefabricated concrete shear wall structure mostly uses a reinforced truss floor slab with a post-casting layer, and the amount of cast-in-place is relatively large; (3) Since the thickness of the inner leaf of the composite wall panel is only It is 40mm~60mm, and it is not applicable to use the pre-embedded shear bolts of the wallboard to connect with the floor; The construction method of leaf concrete thin slabs connected with ring beams has serious thermal bridge problems and is not suitable for low-energy buildings

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