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1、Large span continuous beam bridge construction control contentand method ofKeywords: large span continuous beam bridge; construction control; Abstract: in our country, the suspension bridge, arch bridge, continuous rigid frame bridge and other aspects of research and practice has achieved good resul
2、ts, but for large span prestressed concrete continuous beam bridge construction control technology of the relatively few studies. So the research and application of large span prestressed concrete continuous beam bridge construction control technology has very practical significance in engineering.
3、This paper first analyzes the influence of long- span bridges construction control factors, followed by the construction of the contents and methods of construction control, the control principle are elaborated.1 Prefa ceThe construction of long span bridge to go through a complicated process, in th
4、is process will be a lot of certain and uncertain factors, leading to the bridge structure s actual status deviates from the theoretical calculation state. Therefore, the bridge construction control is the focus of the construction process by analyzing deviations which occur in the identification, i
5、dentify problems and timely rectification, and the structure of the follow-up phase undertakes forecasting, make construction system is always in control.Effec ts of 2 fa c tors in the construc ti on control of 1 Large span continuous beam bridge construction control the main purpose is to make the
6、actual construction condition and maximize the ideal design ( alignment and stress ) coincide. To achieve these goals, we must fully understand the construction state may deviate from the theoretical design status of all the factors, so as to implement effective control of the construction of have a
7、 definite object in view.2.1 s truc ture pa ra m e te rs 2 Regardless of the bridge construction control, the structure parameters are very important factors to consider, structural parameters control in the construction simulation analysis of basic information, whose accuracy directly affects the a
8、ccuracy of analytical results. In fact, the actual bridge structure parameters are generally very difficult to design for structural parameters of identical, there is always some errors, control of construction how to properly credited for these errors, so that the structural parameters of the actua
9、l structure parameters as close as possible to the bridge, is the first problem to be solved. Structure parameter mainly includes structure cross section dimension, structure the elastic modulus of the material, material density, coefficient of thermal expansion of materials, construction loads, pre
10、stressing or cable force etc.2 .2 c onstruction te c hnolog yConstruction control for construction services, in turn, construction quality has adirect impact on the implementation of target of control. In addition to the requirements of construction technology must comply with the control requiremen
11、ts, the construction control must be included in the construction conditions of non ideal brings the fabrication, installation and other aspects of the error, and make the construction state is maintained in the control of.2 .3 c onstruc ti on m onitoringConstruction control of bridge monitoring is
12、one of the most basic methods. Monitoring includes stress monitoring, deformation monitoring. Because the measurement apparatus, instrumentation installation, measurement method, data acquisition, environment, errors exist, therefore, structure always exist error monitoring. In the control process,
13、in addition to the measuring device, method to try to reduce the measurement error, in the control analysis must be included in the.2.4 c ha ng e s of te m pe ra tureTemperature change on the stress and deformation of the bridge structure has great influence, this effect varies with the temperature
14、change in different time on the structure, state ( stress, deformation ) were measured, the results are not the same, if the construction control of neglected the factors, it is difficult to obtain the true state of the data structure thus, it is difficult to ensure the effectiveness of control, the
15、refore, must consider the influence of temperature change. Is generally a day the temperature variation in smaller morning as required to control data acquisition time. But for seasonal temperature difference and the bridge body temperature residual effects to attention.T he 2 . 5 m a te ria l shrin
16、k a g e , c ree pOn the concrete bridge structure, material shrinkage, creep of structural internal force, deformation has a greater influence, mainly due to the large span continuous beam bridge construction concrete common loading age short, each stage of age difference between the major cause, control should be carefully studied, in order to adopt reasonable, practical creep parameters
