Grouting sleeve connection is suitable for large-diameter steel bars, suitable for centralized connection of steel bars, and can be directly or indirectly connected..

Advantages: Suitable for large-diameter steel bars, with a wide range of applications and mature technology; Suitable for centralized connection of steel bars, which can be achieved through direct or indirect connections; Easy to operate on site, group grouting technology can be used for grouting, with high construction efficiency..

Shortcomings: High cost, difficult connection operation, and difficulty in hidden detection..

Considering low rise buildings, under the action of horizontal forces, there is basically no overturning force, and shear force is the main force. Therefore, sleeves are omitted, and circular hole reinforcement grouting connection is directly used to reduce costs and construction difficulties..

The main problem during the grouting process of steel reinforcement sleeves is structural safety. Lack of effective quality inspection methods for sleeve grouting. The existing technology has significantly increased the cost of detection Duration. Urgent need to solve the winter grouting shutdown problem Cost. The average cost of a single sleeve (sleeve+grouting material+auxiliary materials+labor) is 100 yuan..

The double skin wall connects two prefabricated panels in the factory, and the inner core between the two walls is reserved for post pouring concrete area. The construction has a high content of concrete and steel bars, and has good structural integrity, which can be applied to the assembly of exterior walls in underground buildings. Advantages: The upper and lower shear walls are connected in situ, and the inner and outer wall panels are subjected to overall stress with the inner core; The prefabricated part replaces some templates and can be fully automated for production..

The inner and outer wall panels are patented special hollow structure wall panels, and other components are the same as the current shear wall structure. The exterior wall still adopts a sandwich structure with integrated structural insulation and decoration, which can fully utilize the existing assembly line equipment and achieve the decorative effects of plain concrete, artistic concrete, and porcelain panels through reverse striking technology. The exterior wall insulation has good fire resistance and durability. Using sleeve free steel bar lap connection technology to avoid safety hazards in sleeve grouting. Forming an overall structure by overlapping steel bars and pouring concrete into the cavity of the wall panel; Experimental research has shown that the seismic performance of the system is basically consistent with that of cast-in-place structures, fully meeting the current national standards requirements. The minimum size of the internal cavity of the wall panel is greater than 10cm, making it easy to compact the concrete pouring. The large section and light weight are conducive to achieving fast and low-cost construction. Compared with existing technology, for high-rise residential buildings with a prefabrication rate of about 40%, the cost can be reduced by about 200 yuan/m2 under the premise of achieving the same building functions..

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Source of information for this article: Prefabricated 360.

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