Suspension bridge cable clamp screw axial force synchronous construction system and use method thereof

Abstract

The invention discloses a suspension bridge cable clamp screw axial force synchronous construction system and a use method thereof, and relates to the technical field of bridge engineering construction. The system comprises a tensioning device, an ultrasonic detection device and a control device, wherein the tensioning device is used for being connected with a to-be-tensioned screw and tensioningthe to-be-tensioned screw; the ultrasonic detection device is used for being connected with the to-be-tensioned screw, transmitting an ultrasonic signal to the to-be-tensioned screw, and detecting the transmission time of round trip of the ultrasonic signal in the to-be-tensioned screw; and the control device is connected with the tensioning device and the ultrasonic detection device and is usedfor calculating correction construction axial force F2 in the to-be-tensioned screw according to t2, t3 and a preset formula, and the tensioning device is controlled to carry out tensioning on the to-be-tensioned screw rod by adopting the correction construction axial forceF2. According to the system, a correction scheme is formulated for the retraction loss condition of single screw tensioning,and the engineering problems of large axial force loss and large randomness of the screw after a nut is screwed are well solved.

Description

technical field [0001] The invention relates to the technical field of bridge engineering construction, in particular to a suspension bridge cable clamp screw axial force synchronous construction system and a use method thereof. Background technique [0002] The cable clamp of the suspension bridge is one of the main components of the superstructure of the suspension bridge. The main defect in the use process is that the cable clamp slips on the main cable. Article 9 requires inspection of "whether the upper end of the suspender rod of the suspension bridge and the cable clip of the main cable are loose, displaced and damaged". Article 7.2.1 of the Technical Condition Evaluation Standard for Highway Bridges (2011) also regards the slippage of the cable clip greater than 10mm as serious defect. [0003] At present, during the actual construction of the cable clamp screw, the jack is generally used to stretch the screw to the construction axial load, and then the worker uses ...

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Problems solved by technology

[0004] However, in the current jack tensioning process, due to the different roughness of the contact surface between the nut, the spacer and the cable clamp, and the slight difference in the processing of the screw thread itself, the degree of the worker's tightening of the nut is random. Larger, the axial force loss of the screw after the jack returns oil is greater, and the randomness is also greater. According to the actual measurement of a certain bridge, the axial force loss of the screw after tensioning ranges from 10% to 60%. It is difficult to accurately control the axial force fastening construction. After the construction is completed, the axial force of the screw cannot be checked in time. Re-tensioning after the later inspection will bring a large workload, increase the construction cost and easily delay the construction period.

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