這是鳥巢英文介紹ppt，包括了Project introduction，The main truss segment，Support layout，The main truss hoisting process，Construction difficulties and characteristics等內(nèi)容，歡迎點(diǎn)擊下載。

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The construction technology of the bird's nest xxx xxx xxxx xxxx Project introduction The National Stadium is located in Beijing city of Ayutthaya Road south wing， Olympic Park in the central area， is the main stadium of the Beijing 2008 Olympic games. The main structure of the design service life of 100 years， fire-resistant grade level， seismic fortification intensity of 8 degree， underground engineering waterproof grade 1. Space was the main construction works saddle ellipse， mega space saddle steel truss is 333 meters long from north to south， body weaving "nest" structure， the steel structure of steel 42000 tons， concrete stand is divided into upper， middle and lower three floors， concrete structure stands as the 1 underground floors， the ground of reinforced concrete frame 7 story shear wall structure system. Sacoustic ceiling. The main truss segment and the equipment selection The mega truss of large span the hoisting of the very important segment， not only to consider the various section weight， installation work radius and domestic， the existing crane resource matching， temporary fixation and overlap at the same time each segment in the supporting tower on each section is defined between lifting sequence is also the key construction. . Brace layout and design technical conditions The national stadium roof steel structure is a large span space mega truss structure， internal force of frame generated by the self weight of the larger proportion. According to the installation of steel structure construction organization design， steel structure by using the method of segmental hoisting overall installation altitude docking (also referred to as bulk construction method)， 78 supporting points set in the process of structure construction， set in the lower chord intersection node positions of supporting points， as shown in the figure. Design specification Technical support conditions tower design from support unloading analysis results， it gives an overall， unloading process synchronization， each supporting point in the reaction force each unloading step. Statistics on each point of maximum reaction force in all steps of the applied load is used in the supporting tower. At the same time， in the process of installation of truss， while supporting the vertical force tower by no during unloading corresponding supporting point of maximum reaction force is large， but the installation sequence of inner ring， outer ring first after the construction process of the main truss makes a great wind load bear， and as a level set load exerted on the tower column.Therefore， the wind load during the installation of the main truss is also supporting a control condition by force analysis of tower.The national stadium building top surface of hyperbolic saddle， the maximum height of 69.1m， lowest height of 40.7m. This roof shape also determines the overall shape of the support tower top surface during its installation is a saddle shaped， tower high， this is a technical condition of support design. The main truss hoisting process According to segmentation and field site use condition of the main truss of the main truss， space by vertical spell， plane truss by assembling way lying spell. （1）Space truss hoisting process Space truss although hoisting tonnage than plane truss， but its use patching method， born after not pulling back straight， direct leveling in place， lifting process is relatively simple plane truss， space truss is the main control measures mainly originated and leveling and its process: （2）Space truss of large tonnage， share the pulley block stress is large， as shown in Figure 3.4， using multiple pulley group during the leveling run rope long stroke. Traditional component attitude adjustment tool using gourd adjustment， speed slow， want to change the stroke number. The project adopts the small car hanging pulley group to run the rope to smoke， because the car hanging high， the number of overall adjustment process to replace the travel less， pulls out the rope fast， high efficiency. （The plane truss although hoisting tonnage is space truss is small， but its use lie spell mode in the gantry crane assembly， born at the same time pulling， back straight， and then assembled in the gantry crane lifting point ground leveling and lifting in place， lifting technology is relatively complex， the plane truss hoisting mainly is the main control measures of bodiless， pulling and leveling the construction procedure and process: （1）Since the emergence of 800T crawler crane lifting the main truss chord， chord three provided two gantry crane. Three crane three hanging points plane projection range including gravity， guarantee three points at the same time stress， as shown in Figure 3.5; at the same time， over the auxiliary line vertical component of gravity low chord to point distance equal two gantry crane， gantry crane to ensure the two uniform load， and is convenient for monitoring， control in the pulling process.（2）Born after pulling， pulling for the monitoring of lower chord two balanced promotion， the distance in the bottom chord hanging two tape measure for monitoring of bottom chord from the ground. When two ground distance range， adjust two gantry crane hook at both ends of the balance of the component. Because the instrument Longmen hook the next without measuring component weight， here through the vertical distance control two hanging points to the center line of gravity and pulling process two balance， ensure the uniform stress of two gantry crane.（3）Component pulling leveling， crane operation to emplacement point is in place， for the rational use of large crane， in place by Kama plate in place of the way. According to the installation member length， weight， center of gravity position， the upper and lower chords in calculation of fracture Kama temporary fixing force need horse board size， length， length of weld. First the upper and lower chords on welding surface Kama plate， frame reaches the installation in place position， calibrated will welding completed three other surface Kama board， crane can release the hook. ①Large size， heavy weight 　　As the main load-bearing member of the roof structure， truss column section 2 largest national stadium at night 5m * 20m， height of 67m， single frame the weighing 500 tons. While the main truss height 12M， double - beam through the largest span 145.577+112.788m， not through truss span trussed columns for maximum 102.391m， with the main truss size， monomer weight. ②Complex node 　　Because the components of the project are box section member， therefore， both the main structure between， or between primary and secondary structure， there are many members space crossing phenomenon. In addition to the secondary structure is complex and changeable， less regularity， cause the node structure of the main structure is quite complex， node type diversity， making， installation of high precision. ③The quantity of welding 　　The project site is connected to the welding lifting piecewise multiple， field weld length， and thick plate welding， welding of high strength steel， cast steel welding of the bird's nest interior majority， causing the site to a considerable welding workload， high difficulty， high-altitude welding inverted welding. ④The winter rainy season construction 　　The project main structure lifting time to surmount the winter and the Spring Festival， so there is the winter rainy season construction， construction difficulties。 The National Stadium， the main truss installation difficulty is mainly manifested in the:1、Selection of main truss roof supporting point arrangement， hoisting unit segment;2、Hanging point， space of main truss lifting lugs arranged， rigging selection;3、he main truss gantry crane plane with operation process assisted turning over;4、Treatment of truss installation counterpartThrough one by one research of above each difficulty analysis， find out the corresponding countermeasure， and scientific test as the basis， the main structure of the National Stadium installation has been made in the overall success of construction period， quality， safety， it will also provide the precious experience for similar engineering.lh1紅軟基地

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