by On the basis of overseas investigation, research and discussion, Zhongnan Holding Group Co., Ltd.
(Haimen City, Jiangsu Province) decided to cooperate with conrock industries Pty Ltd of Australia to introduce precast concrete assembly technology (NPC).
This technology is a mature precast assembly technology of concrete structure, which has been popularized and applied in Australia for nearly 20 years.
As a concrete assembly structure system, the principle of NPC (precast concrete assembly) technology is mainly to use precast reinforced concrete columns and walls, precast reinforced concrete composite beams and plates, and connect the nodes of beams, plates and columns into a whole through embedded parts, reserved reinforcement Jack mortar anchor connection, reinforced concrete post cast parts, etc., so as to form an overall structural system.
Zhongnan Holding Group Co., Ltd.
cooperates with connock of Australia to introduce precast concrete assembly technology (NPC) and combine it with China’s national conditions to form a “fully precast integral shear wall structure” (hereinafter referred to as NPC system).
Main principle: precast reinforced concrete columns and walls, precast reinforced concrete composite beams and plates are adopted, and the beams, plates, columns and joints are connected as a whole through embedded parts, reserved socket grouting and reinforced concrete post pouring parts to form an overall structural system, and the precast assembly rate reaches 90%.
Precast prestressed concrete assembled integral frame structure has the advantages of fast construction speed, easy quality control, material saving, good component appearance quality, good durability, reducing on-site wet operation and environmental protection.
The world structure system of Nanjing Dadi construction group is a precast concrete assembled integral frame structure system introduced from France in 2000.
Its precast components include precast concrete columns and precast prestressed concrete composite beams and plates.
The NPC (new precast concrete) technology system of Zhongnan group, which is introduced from foreign precast concrete technology and combined with China’s design requirements, has formed a technical system with its own characteristics.
Vertical members, shear walls, infilled walls, etc.
are fully precast, and horizontal members, beams and plates are in the form of superposition.
Connection of adjacent members: the reinforcement slurry anchor connection is realized vertically through the reserved dowel bars (connecting reinforcement) of the lower members and the reserved metal corrugated slurry anchor pipes of the upper members, and the cast-in-situ concrete connection belt is set horizontally through appropriate parts to connect with the cast-in-situ concrete; The horizontal members and vertical members are connected by the reserved dowel bars of the vertical members extending into the beam, slab composite layer and the cast-in-situ concrete of the composite layer; The vertical members and horizontal members are connected to form an integral structure by means of reinforcement slurry anchor joint, cast-in-situ connection belt and superimposed cast-in-situ.
The NPC technical system is relatively systematic and perfect.
The vertical members of the structure are basically fully precast and the horizontal members are in the form of superposition, which greatly reduces the cast-in-situ quantity and the assembly rate is more than 90%.
The shear wall components are completely connected through vertical mortar anchor reinforcement.
There are a large number of grouting holes on site.
It is not easy to ensure the grouting quality of each hole, and it is also very difficult to conduct on-site sampling inspection.
Therefore, it is necessary to further improve the connection in NPC technical system, so as to reduce the on-site workload and ensure the structural safety more reliably…
