On the steel frame high-rise building construction Research _3190 Installation a

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On the steel frame high-rise building construction Study on Installation and Connection Technology
 
 
  Paper Keywords: high-rise building; steel frame; lifting; connection   Abstract:  In this paper, an engineering example, for the engineering difficulties, detailed description of the high-rise steel frame buildings structure of the lifting and installation, welding technology.     1 Project Overview    a high-rise office buildings from the main building and the podium composition. On the ground 49 floors, 3 basements, ground level is 183.75m, the side of 41.16m. Steel columns for the box frame, frame for the H beam steel structure also features a huge cantilevered support structure of the oblique system, diagonal support beam with wide-flange H. Structural system suffered mainly by the horizontal force and the reinforced concrete core wall bracing commitment. Layers of the core tube on the floor are cast from reinforced concrete, the core tube and frame tube between the beams for the steel beam, shear studs will be welded on the steel beam flange, to form a composite slab, the floor is 51mm deep pressure 74mm thick steel plate pouring concrete to form the composite floor slab 125mm thick. Three podium bearing system for reinforced concrete frame structure, reinforced concrete floor slab structure, steel structure supporting the glass roof top.    2 project and the difficulty features    structure of large cross-section steel bracing is the main force component, on the part of the 9-layer structure to withstand the vertical force and the whole building horizontal force. Bracing across the nine structural layer, each bracing about 58.lm, the high-altitude lifting, positioning, measurement and correction is the installation of steel structure of the project the biggest problem. Du wall thickness of steel 130mm, 130mm thick steel plate butt welding full penetration field at the time the domestic construction steel construction is rare, difficult to spot welding, welding quality control difficult. This is the steel construction of this project is another problem. Corner of the building site C4 steel columns, and the maximum weight of this component, to the tower crane selection, layout, construction and sub-structure layer steel columns, sub-section steel bracing lifting difficult.    3 Erection of steel frame    3.1 crane  calculation and layout of towers in the core of this project laid a central tube within the climbing M440D crane, tower crane from the weight of the largest 32t, the maximum arm length 55m. Arranged outside the main structure of a 500HC-S cranes, construction site temporary construction, component assembly space, yard, auxiliary buildings, rooms and room layout tools need to be played under the weight of these two tower crane layout.  Two crane spacing L = 410 +5000 +1217 = 4 × 5880 +5000 +1217 = 29.737m. Where: 10 is the column axis spacing.  Crane rose above the maximum height of the core tube H = H0-nH1 = 45.1-6 × 3.75 = 22.6m. H0 for the installation of the climbing net height, n is the standard number of layers, H1 as the standard height.  3.2 Lifting of steel structure Steel Structure  basement. Basement, including the core tube steel reinforced with steel columns (4), the external steel columns (23) and steel bracing between columns. Due to the construction site conditions, to open the ramp to the basement of the difficult, and if the crane hoisting steel structure open to the basement, and the interaction of large civil construction, construction progress is difficult to improve. Therefore, considering the initial construction of the basement floor to install a 500HC-S outside the climbing tower crane, either complete the underground, the ground all the steel components of the lifting, and climbing tower crane can be installed within M440D, help speed up the overall construction schedule. Steel Structure  shoot. Steel columns and steel bracing section are taken when hoisting the main consideration is: to meet the M440D crane lifting capability and component transport capacity as a precondition; as much as possible to reduce the number of nodes; steel columns as much as possible to ensure that the number of nodes. Steel columns set in the floor above the node position of 1.2m in order to facilitate installation and construction.  Steel columns and beams of the lifting lifting principles: first load beam main beam after the loading times for the accelerated construction schedule, the lighter steel beams to be taken for a machine method of hanging, for the multi-floor unit, the first lifting top beam, after lifting the lower beam, it is a good framework for stability.  Hoisting steel bracing is the project of lifting steel bracing is difficult, due to the length of steel braces 38m, lifting the entire root of the more difficult, so take a section lifting, steel bracing to ensure the overall stiffness and stability of installation, the steel bracing and floor beams on the ground after the total lifting assembly,You are not allowed to view links. Register or Login, the temporary steel beams play a supporting role.  Cantilevered steel bracing each divided into three lifting, each with steel beams were assembled on the ground after the total lifting. Chain 4,5 is used to adjust the tilt of steel bracing, the stiffness of the beam, coupled with steel beams and steel bracing is only a temporary connection, not under heavy load, so to strengthen the use of chain assembly 1,2,3 pieces. Before the lifting, chain 1,2 and 3 must be tightened to prevent the deformation of steel beams in the lifting process. Steel bracing between columns and cantilevered steel bracing the weight of smaller size than can be directly lifting.