Lattice column is a kind of section which is designed as biaxial or uniaxial symmetry, and its section is usually steel or steel plate. The steel beam and steel column are connected by strong axis. To avoid the lateral deformation of steel beam during hoisting, strengthening measures shall be taken during hoisting. When the steel beam is in place, it shall be supported immediately. After the roof panel is installed, no welding shall be carried out at any part of the roof truss.

Function: the lattice column is used as the compression and bending member, mostly used for the frame column and independent column of the factory building. The section is generally steel or steel plate, which is designed as biaxial symmetry or uniaxial symmetry section. Members of lattice system are composed of limbs and battens. Limbs mainly bear axial force, while battens mainly resist lateral force (relative to limb axial force).

There are mainly battens and battens for lattice columns.

That is to say, at the enlarged ends of both sides of the foundation pit, the length of the first concrete support and the second and third steel support is longer, which produces bending moment and leads to support deformation. Therefore, lattice columns are set to improve the bending performance of the support components and ensure the stability of the support structure.

The structural characteristics of lattice column: the material area is arranged far away from the inertial axis, which can ensure that the bending resistance of members is enhanced under the same axial resistance condition, and save materials.

Main construction technology and key points of lattice column

1、 Construction process

SR220C rotary drilling rig is used for drilling pile of temporary lattice column foundation. The rotary drilling hole is first turned by the bucket bit with valve at the bottom, and then directly put it into the drill bucket. Then, the drill bucket is lifted out of the hole by the lifting device of the drill and the telescopic drill pipe to unload the soil. In this way, the soil is taken and unloaded continuously until the design depth is reached. Dry or clean water drilling technology can be used for the rock and soil layer with good cohesiveness, without mud protection Wall. For the loose and collapsible stratum, or the distribution of groundwater, the hole wall is unstable, so the static mud drilling technology must be used, and the wall protection mud must be put into the hole to protect the wall.