Construction Monitoring And Order Before And After The Construction Of A Steel Tube Concrete Arch Bridge Change Research

Bridge structure in construction is the total construction process is divided into different construction phases step by step, the corresponding stage of construction has the corresponding stress structure. Generally the first to form the bridge structure, to have a certain strength, rigidity, stability can take the next phase of construction added finished component weight and its ancillary equipment weight. Therefore, in the process of the construction of any phase of the bridge structure, the stress and strain distribution will and construction process. In general, in the bridge engineering construction, the main arch foot outsourcing segment concrete construction generally precede the main arch in the beam hoisting.The qujiang moon bridge in Sichuan Quxian never suffered from the terrible flood before July7,2011. It may bring about many security risks to the subsequent construction of the side arches. In order to the construction security, the design Institute makes changes about design. Because of that, the T configuration of the postorder construction should select scaffolding construction, which is very important to the overall duration of the bridge.In order to speed up the construction period, the construction side prepares to make adjustments between the construction of main arch foot concrete outsourcing segment and the lifting of the beam. At firstly we may make the main arch feet outsourcing segment construction and then later changed to the lifting of main arch beams. Actually by the contrary, we could make the lifting of main arch beams and then the construction of main arch foot concrete outsourcing segment, or at least when the construction of main arch foot concrete outsourcing segment finished a half, the construction sequence of the main arch beams lifting would be carried out.The construction group presented the three construction sequences that are as follows:the first condition is that the main arch beam hoisting and the foot of main arch sections enclosed in concrete construction at the same time; the second condition is that after the foot of main arch sections enclosed in concrete construction we would hoist the construction sequence of the main arch beams lifting; the third condition is that after finishing a half of which the foot of main arch sections enclosed in concrete construction we would hoist the construction sequence of the main arch beams lifting. If preferring the first condition, during the lifting time, the weight by the arch beams and outsourcing segment would be shared with the steel pipes and concrete in the steel pipes. Hence, the main arch foot stress would be greater than the second condition. This not only makes the sequence construction such lower security but also brings about bad influence to the arch stress control of the bridge operation period. However, dueling to the simultaneous hoisting construction of the main arch beams with the arch outsourcing segment of the main arch, two construction process lap, it saves more construction period. If preferring the second condition, before lifting the main arch beams the concrete has reached the strength so that concrete of the outsourcing segment and steel pipe and steel pipe’s concrete shared with the weight of the beams. So the main arch foot stress would be less than before. This not only makes the sequence construction such lower security brings about bad influence to the arch stress control of the bridge operation period. It not only increases the subsequent construction security but also is better to control the arch stress of the bridge operation period. For duration terms, because that after the foot of main arch sections enclosed in concrete construction we would hoist the construction sequence of the main arch beams lifting, it would be longer comparing to the first condition. In contrast, if other conditions are not changed, preferring the third condition for construction, the main arch foot stress accumulation level and length of duration between the first condition and second condition. At last, this is beneficial for controlling the main arch foot bridge operator stress and save construction period.This paper will be of more than three different conditions respectively to carry out computer simulation calculation, the calculation results are analyzed, thus the three conditions to make the safe, feasibility analysis.