A two-way prestressed concrete prefabricated hollow slab and its manufacturing method

Abstract

The invention discloses a two-direction pre-stressed prefabricated hollow concrete slab and a manufacturing method thereof. The two-direction pre-stressed prefabricated hollow concrete slab comprises a transverse-hole pre-stressed prefabricated hollow concrete slab and a longitudinal-hole pre-stressed prefabricated hollow concrete slab; the two-direction pre-stressed prefabricated hollow concrete slab is characterized in that the transverse-hole pre-stressed prefabricated hollow concrete slab comprises upper panels, lower panels, longitudinal ribs, transverse ribs and end ribs, which are integrally cast to form a transverse-hole hollow slab body, holes are horizontally formed in the transverse-hole hollow slab body, corrugated pipes are arranged on the transverse-hole hollow slab body, the longitudinal-hole pre-stressed prefabricated hollow concrete slab comprises upper panels, lower panels, longitudinal ribs, side ribs, end ribs and transverse ribs, which are integrally cast to form a longitudinal-hole hollow slab body, and holes are formed in the longitudinal-hole hollow slab body and parallel to the longitudinal ribs. The invention also provides a production line and a manufacturing method. The two-direction pre-stressed prefabricated hollow concrete slab has reasonable structure robustness; the pre-stressed ribs in the longitudinal and transverse directions are combined to form a reliable tie bar system, a clear load force transfer path is provided, and the continuity, the ductility and the overall stability of the structure are improved.

Description

Technical field [0001] The invention relates to a two-way prestressed concrete prefabricated hollow slab and a manufacturing method thereof. Background technique [0002] my country's urbanization is developing rapidly, and the scale of construction ranks first in the world. At present, the industrialization of construction is imminent, and the construction industry is transforming to green construction, energy saving and emission reduction during the construction process, and the manufacture of prefabricated hollow slabs with excellent structural performance is very necessary for the construction of fabricated buildings. [0003] Due to its poor seismic performance, the pre-stressed concrete circular perforated slabs in our country are no longer needed after the Tangshan earthquake. The "IMS" system of Yugoslavia is an assembled monolithic slab-column building with good seismic performance, but there are also problems worthy of reconsideration: 1. China's building design code sti...

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Problems solved by technology

Yugoslavia's "IMS" system is an assembled integral slab-column building with good seismic performance, but there are also issues worthy of reconsideration: 1. my country's architectural design code stipulates for the slab-column-shear wall structure system: the seismic fortification intensity is 8 degrees The height limit of the area is 30m, and it should not be used in the 9-degree area, and the application range is limited; 2. The floor is ordinary reinforced concrete, rectangular and has a bayonet, which is heavy and inconvenient to manufacture and transport; 3. Only the corners of the floor are stuck on the column, especially The slab-column joints of corner columns have poor torsion resistance against earthquakes and horizontal loads; 4. The overall prestressing degree of the floor slab is low

5. After the plate column is installed, the wall is filled, and the connection is poor

[0004] (1) Due to the characteristics of the production process, it is impossible to configure the stirrups, and the performance of bearing the shear force is poor;

[0005] (2) There is no transverse steel bar, no protruding steel bars at both ends and both sides, and it is difficult to meet the design principle of "strongly connected weak members" only by "the partition function of the hollow slab system";

[0006] ⑶. The spiral reinforcement or steel wire mesh of unconstrained concrete at the end, and because the prestress value is large and the prestress transmission length is short, the stress is highly concentrated at the end hole rib, which is easy to cause end cracks and cracks along the hole wall longitudinal splitting crack;

[0007] ⑷, small rigidity, large anti-arch, poor integrity;

[0008] ⑸. Simply supported one-way force, when the floor load distribution is uneven and symmetrical to the center line, torque will be generated, but there is no transverse reinforcement bearing this stress, and the lock groove bears the shear force and transmits the transverse bending moment, which cannot form an effective structure Tie-rod system, without a strong alternative path, it is difficult to avoid chain damage

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