Anti-cracking sliding system for kiloton-grade concrete precast beam segments

Abstract

The invention provides an anti-cracking sliding system for kiloton-grade concrete precast beam segments, comprising a sliding device, support devices arranged on the sliding device side by side, and a traction device for adjusting the positions of the support devices; a support assembly comprises a pressure-bearing screw rod which is vertically arranged and a pressure-bearing nut which is screwed on the pressure-bearing screw rod, and a pressure detecting element is arranged between the lower end of the pressure-bearing nut and a support framework; a hydraulic jack which is used for butting the lower end of the pressure-bearing screw rod and can drive the pressure-bearing screw rod to move upward is arranged on a lower distribution beam; an upper distribution beam is arranged at the top end of the pressure-bearing screw rod, and a buffer block is arranged at the upper end of the upper distribution beam; and the sliding device comprises a sliding way, and sliding shoes are arranged on the sliding way. The anti-cracking sliding system provided by the invention ensures the transport stability of the concrete precast beam segments, effectively prevents the problems of posture change, uneven stress and the like of the concrete beam segments due to movement, and can effectively prevent the cracking danger of the kiloton-grade concrete precast beam segments.

Description

technical field [0001] The invention belongs to the technical field of prefabricated construction of large concrete beam sections, and in particular relates to a system for preventing cracking and slippage of a thousand-ton concrete prefabricated beam section. Background technique [0002] The side-span concrete girders of large-scale mixed girder cable-stayed bridges have large spans and large volumes. The "short-line method segmental prefabricated glue-joint technology" is used for construction, which can avoid quality problems such as hydration heat generated by the overall pouring of large-volume concrete, but thousands of tons The grade concrete prefabricated beam section has the characteristics of small transverse stiffness and heavy weight, so it is easy to cause the stress system of the concrete beam section to change during prefabrication and moving of the beam, resulting in local stress exceeding the standard, resulting in cracking of the concrete beam section. The...

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Problems solved by technology

[0002] The side-span concrete girders of large-scale mixed girder cable-stayed bridges have large spans and large volumes. The "short-line method segmental prefabricated glue-joint technology" is used for construction, which can avoid quality problems such as hydration heat generated by the overall pouring of large-volume concrete, but thousands of tons The grade concrete prefabricated beam section has the characteristics of small transverse stiffness and heavy weight, so it is easy to cause the stress system of the concrete beam section to change during prefabrication and moving of the beam, resulting in local stress exceeding the standard, resulting in cracking of the concrete beam section

The traditional slip system has defects such as poor bearing capacity and large fulcrum deformation, which can no longer meet the needs of slip transportation of thousand-ton concrete prefabricated beams with strong crack sensitivity

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