Main construction methods of steel structure in high-rise buildings

The use of steel structures in high-rise buildings has been going on for decades. Due to the continuous development of steelmaking technology and molding manufacturing technology, the use of steel structure workshop engineering has brought new vitality, engineering construction has also been applied to increase. Therefore, steel structure design and construction technology constantly improve, especially since the 1960s, the rapid development of high-rise steel structure engineering makes steel structure become the first choice for high-rise building design. Application research of Steel Structure High-rise housing system improves the application technology of steel structure system in housing industry, promotes the application of steel structure in real estate industry in international market, and promotes the development of real estate industry.

1.1 Installation of steel structure

In the actual construction process, the completion of the box column according to five steps: 1 material procurement; 2 processing; 3 transport; 4 lifting; 5 connection. Therefore, before brushing anti-rust paint, should remove the rust on the surface of steel structure, oil and so on. For the installation of steel beams, we can divide them into main beam installation, non-main beam installation and external beam installation. Also, it should be noted that after the columns form a unit, the main beams should be tied together and hung. According to the design requirements of this project, the lifting times should be 2 to 4 times. Due to space and electrical conditions, secondary beams and shear wall frame beams are usually mounted in a single lift. High strength bolt can be said to be the most advanced connection method of building steel structure at present. The characteristics of high strength bolt are as follows: 1 can be replaced.2 convenient construction.3 average power transmission. In the design of this project, the high-strength bolt uses friction connection. The fastening method is to use a special ratchet wrench and torque wrench after the initial and final tightening. Stud welding is very important for the construction of high - rise steel structure. There are two common stud welds. One is to weld steel beams directly. After passing through the special-shaped steel plate, welding it to the steel beam is the first structure of the project.

1.2 Concrete Construction

In this project, the concrete components have two main parts: one cast-in-place concrete floor. 2 core wall. The concrete goes straight through the concrete pump. According to the structural characteristics of the project, the floor should be supported by the lower wing of the H-beam small H-beam, and placed on it bamboo plywood and steel bars. The method used for pouring concrete in box columns is to squeeze concrete out of the concrete. Through the pump pressure, the jacking method, from the bottom to the top of the tank top. When the concrete is not raised, the entrance wall of the bridge should be checked with the designer to ensure that the jacking pressure is within the specified strength range. In addition, special pressure should be installed on the side wall at the bottom of the tower so that we can monitor the change of concrete pressure in the column at any time. At the same time, in order to ensure that the concrete slump exceeds 200 mm, we must require a ratio of strong concrete mix.

1.3 External wall panel installation

The wainscot we used was ALC with a thickness of 175 mm. The plates are all produced in the factory and then transported to the construction site for hoisting. The lifting equipment used is tower crane. More than 4,600 TU boards and 5,180 TU art boards. The construction process shall be based on the construction drawings provided by the manufacturer. The floor wide Angle steel shall be secured to the internal expansion bolts of the wallboard and connected to the special connecting rod of the ALC board. The gap is sealed with mortar and sealant.

1.4 Internal wall panel installation

When installing the inner wall panels, we used type C ALC panels of 125 thickness. Plates are manufactured in the factory and transported to the site for installation. Because the operation is simple, not subject to the weather and other restrictions. We use special PVC sealant for the tile of the toilet and other parts. Internal walls are usually installed in the same way as external walls.