Bowl Type Full Framing Load Transfer Analysis In Construction Phase

According to choose material the full framing type can divided into door type steel pipe full framing, fastener full type framing and buckle bowl full framing etc. According to its support structure can be divided into full framing, beams bracket, and their combination. Through the introduction of common advantages and disadvantages of bracket as well as it's scope and application of this bracket, through the continuous beam preparation work before construction, according to the practical situation and characteristics determine the bowl type scaffold form and structure type as the use of the project scheme, and emphatically introduces the bowl type and scaffolding, requirements and matters needing attention, in order to verify the test results, This section describes the bracket design and calculated in accordance with the characteristics of the beam cross section of the process of using sub-parts. At the same time points out the bracket structure design calculation, and the whole calculation process, especially in the calculation and design of the box beam structure in the process of how no specific load is calculated, cause a lot of vague concept and doubts in the bracket design calculation and confusion. This article makes the box structure construction in the process of bracket design and calculation method of load values to be clear, solve the box beam body bracket method in construction design and calculation of confusion, this clever in the process of box beam construction of experimental device was set, through the joint efforts of the author and his team and, by studying the method of full framing construction site for concrete construction process load increase corresponding bracket deformation, bracket deformation data collection, and through the data analysis research bowl type full framing in box girder concrete construction stage of the stress changes, one-time whole full framing is verified in the concrete pouring in the process of load transfer mode and the main transmission path.Theoretical analysis support the total elastic deformation and experiment are affected by the temperature, and by taking measures to eliminate in the process of experiment, experimental equipment and experimental scheme are determined, the experiment is simple and also feasible, can effectively support the vertical load transfer theory. Concrete method is the typical position in bracket: box beam cross end, 1/4 span and the arrangement of measuring points across the cross section, and in each section can represent different monitoring location layout, the size of load before the concrete construction, construction, construction of three stages, each stage through deformation transfer bracket deformation data, calculate the support at different stages of concrete construction deformation, using the relationship between the deformation and stress and the stress and the bracket load to calculate the relationship between each point in the process of concrete construction in different stages of concrete pouring load increase, of each measuring point in the process of concrete construction slabs, web, and added value of different concrete pouring load stage. For the same or similar parts and different parts of the added value of load classification, sorting and analysis, to analyze the bracket in concrete construction in the process of load transfer form and the actual situation of load transfer size. At the same time using bracket wing loading points, web and a different part of the roof and floor points after removing the web design and calculation method respectively, the reasonable partition beam body section. According to the different regional load representative value, calculate the support theory stress from different parts of the situation. Load results in order to make the theoretical calculation of the added value of the load in the process of corresponding with the experiment, analysis in theory or in order to ensure the safety of the structure on the algorithm of the artificial increase the load, and eliminate these factors on the data, calculate the full framing construction of box girder in different locations in the process of concrete pouring concrete theoretical calculation result of dead load. At the same time, using the finite element theory, the use of general Midas software points beam cross section as a whole body modeling, and according to the characteristics of the beam body weight of transverse load distribution on cross section partition modeling modeling calculation with two cases respectively, calculate the bowl type full framing support theory stress in the concrete construction process the results. Load data and through the construction site experiment results and the bracket design calculations and Midas software by comparing and analyzing the results, determine the current according to the horizontal section of support beam body structure design and calculation results and the use of Midas software modeling, the whole cross section of segmentation modeling are the calculated results accord with the actual, so as to determine the design calculation method of the key links and key points for attention, determine the vertical load of concrete in the construction phase transfer bracket design and calculation of the core, for the majority of young technical personnel to provide according to the actual distribution of box girder cross section load holder proof of the correctness of the design calculation method, and the load partition method, is given to eliminate technical personnel in the design of constant load and calculation values when concerns and fuzzy concept. Emphasis on full framing design load value when carried out in accordance with the different parts of the section, respectively to calculate the correctness of the parts, and consistent with the actual load transfer. Thus in box girder construction of full framing support design according to the cross section division method of design calculation, to ensure that the structure safety and efficiency of the whole support scheme. Also proved that in the construction and design of box girder structure, the load calculation for load more reasonable partition, can in order to safeguard the safety of the structure and cost savings.Construction design was given in the box beam structure scaffold law, according to the flange and web after removal of the top web and bottom separately in different parts of the value of the calculation method, also it proved its rationality and validity. Also it gives advice when you use MIDS software support modeling and calculation, according to the actual structure of the beam partition modeling methods and specific operations. Meanwhile corrected in accordance box girder Load value partition segment performed bracket design, bracket appears insufficient strength, according to the conventional arrangement of primary and secondary beams and consider construction loads and concrete load through the primary and secondary beams and lateral transfer to redistribute dangerous idea and wrong ideas. Computing load is given in brackets appear insufficient intensity bracket bracket arrangement in accordance with the strongest theory still can not meet the requirements, without changing the structure of the bracket through the selection of high strength and premise computing area primary and secondary beam deflection less than or equal to the axial bracket primary and secondary beam material modification to solve common technical problems of the actual construction process recommendations.