Prestressed concrete cover beam based on prefabricated prestressed UHPC (Ultra High Performance Concrete) shell and construction process of prestressed concrete cover beam

Abstract

The invention discloses a prestressed concrete cover beam based on a prefabricated prestressed UHPC shell and a construction technology thereof, the cover beam comprises the UHPC shell, a support, a pier column, a reinforcement cage, a concrete rib, an I-shaped steel rib and a prestressed reinforcement, and the UHPC shell is arranged at the top of the pier column through the support; common concrete is poured in the UHPC shell; concrete ribs and I-shaped steel ribs are arranged on the inner surface of the UHPC shell; prestressed reinforcements are arranged at the tops of the I-shaped steel ribs; a prestressed tendon / cable is further arranged in the UHPC shell and fixedly connected with the UHPC shell. The construction technology comprises the steps that the prefabricated UHPC shell is hoisted to the top of the pier column; i-shaped steel ribs are mounted in the UHPC shell; installing prestressed reinforcements at the tops of the I-shaped steel ribs; tensioning the prestressed steel bars and then fixing the prestressed steel bars on the I-shaped steel ribs; prestressed tendons / cables are arranged in the UHPC shell; common concrete is poured into the UHPC shell; and after the common concrete reaches the design strength, the prestressed tendons / cables are tensioned, and finally the prestressed tendons / cables are fixed to the UHPC shell through base plates and anchorage devices.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, in particular to a prestressed concrete cover beam based on a prefabricated prestressed UHPC shell and a construction process thereof. Background technique [0002] At this stage, for the construction of concrete bridges, the concrete construction is usually carried out on site, while the construction of cast-in-place concrete requires a large number of formwork and temporary supports, so there are large site operations, complex construction procedures, long construction periods, and guaranteed construction. The disadvantages of relatively difficult quality, large construction area and high construction risk will not only consume a lot of energy, but also have adverse effects on the surrounding environment, and the supports and cover beam formwork erected on site are prone to defects, which will also affect the quality of the cover beam. produce adverse effects. [0003] In addition, ...

AI Technical Summary

Problems solved by technology

However, for the hoisting-in-place construction method using the integral prefabricated concrete cover beam, although the impact of construction on the traffic under the bridge is reduced compared with the construction method of pouring concrete on site, the heavy cover beam will give The transportation and hoisting caused great difficulties

In addition, the above construction methods will be limited by many factors such as manufacturing site, hoisting equipment, hoisting space, transportation facilities, etc.

[0005] Prefabricated concrete prefabricated construction technology has become an important development direction of my country's engineering construction. The prefabricated assembly technology of bridge superstructures, bridge piers, pile foundations and other components has also become mature, but the assembly of large-tonnage cap beams has not been solved. Solve, especially the large cantilever cover beam, its dead weight can usually reach 200t ~ 600t, transportation and hoisting are very difficult, and it is even more difficult when using prefabricated construction

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