Several common construction schemes for space frame installation

There are several common types of engineering construction schemes for spherical space frame installation. Our country has selected a variety of installation methods at the large-span spherical grid installation construction site, and has created some installation technologies with global excellent standards. The installation technology of spherical space frames is probably acceptable. Divided into several categories such as integral hoisting method, integral lifting method, high-altitude sliding method, high-altitude bulk method, and block installation method. Integral hoisting method When the spherical space frame pavement is assembled, it can be selected to shift on the spot with the column or carry out in the field. When the post is shifted and assembled on the spot, the net must be moved or rotated 1~2m up and down in the high air after it is raised and then lowered into place. Because the column is surrounded by the space frame pattern of the spherical space frame, all beams connected to the column should be broken, that is, the frame column should be constructed after the spherical space frame is lifted. In addition, the structure of the building on the left and right of the road must be carried out after the spherical grid is made and installed. Parallel surface construction is not allowed. Therefore, when the site is approved, the spherical space frame can be assembled on the spot as the tunneling face, and then the lifting equipment, sandbag leggings can be used to move the spherical space frame at a large distance to install the spherical space frame.

The overall improvement method The overall improvement method refers to the installation of improved machinery and equipment on the structural column to improve the spherical space frame, or the construction method of the column head sliding form in addition to the spherical space frame. At this time, the spherical space frame can be used as a practical operation service platform . The overall improvement can be divided into single lifting spherical grid method, lifting beam lifting net method, lifting net sliding mode method. The single-lift spherical space frame method is that after the spherical space frame is assembled in the design plan, the small machine installed on the column head is used to raise the overall height to the building elevation and then lower, in place, and fixed. The method of lifting beams and nets is that the spherical space frame is assembled in place at the design plan. In addition, the spherical grid assembly line ground ring beams such as the support plate are installed, and the space frame support is idle in the middle and south of the ground ring beam, and installed at the top of each column Such as the improvement of machinery and equipment, this kind of improvement machinery and equipment is in addition to the lifting of the beam, lifting the spherical space frame to the building elevation.

The lifting space frame sliding form method is to put the spherical space frame on the design plan in place, and the column head is constructed by slip form the improvement of the spherical space frame is to use the hydraulic jack for sliding formwork installed on the building steel bars in the column or the plate lifting machine on the stiffening reinforcement diagram to raise the spherical space frame while sliding the template concrete pouring column on the other side. The application of the overall improvement method to improve the equipment is generally small, the cost is lower, and the application site is narrow and small. High-altitude sliding method The high-altitude load method refers to the installation method in which a load of the split spherical space frame module is assembled on the guide rail set in advance to the design plan. This strip module can be assembled on the road surface and hoisted to the support frame with lifting equipment. When the working capacity of machinery and equipment is insufficient or other factors are stored, it can also be assembled with small modules or even single pieces on the high-rise assembly service platform.

Strip module.The high support frame is generally built at one end of the building. The bar-shaped module of the spherical space frame slides down from one end to the other during load. High-altitude bulk method The high-altitude bulk method refers to the method in which small modules or single pieces (single members and individual connection points) are assembled immediately in the design plan. There are two methods for high-level scattered weighing: full support (double-row scaffolding) and overhanging method. The full support frame method is mostly used for single-piece assembly, and the overhanging rule is mostly used for the overall assembly of small modules at high places, or the assembly of triangular meshes of curved reticulated shells. When the spherical space frame is assembled with the full support frame, the top of the support frame is usually covered with wood board or bamboo scaffolding as a service platform. When the cantilever method is used for assembly, the small building blocks must be made in advance, and then the small building blocks must be hoisted to the building elevation in place with lifting equipment. The cantilever method installation can save the need to build and disassemble the support frame and save raw materials. Block installation method The layered installation method means that the spherical grid frame is divided into strips or small modules, each of which is lifted by lifting equipment to a high design and left idle, and then assembled into an overall installation method. To put it bluntly, the bar shape means that the spherical space frame is divided into multiple sections along the long-span orientation, and the total width of each section can be from one grid to three grids, and its length is the span of the short span. To put it bluntly, the small piece means that the spherical space frame is divided along the vertical and horizontal directions, and the module looks like a rectangular frame or square. The net weight of each module is based on the current capacity of the lifting equipment.