The length of each pole of the structure of the attachments of the tower crane can be adjusted. Each pole should be kept in the same plane, and the length of the top block and the pole should be adjusted to the vertical axis of the tower. After general attachment, the verticality of the axis line of the tower crane is checked and adjusted by the theodolite. The perpendicularity of the body below the attachment point is not more than 2/1 000, and the perpendicularity of the attachment point is not more than 3/10 000. The adjustment of verticality can be achieved by adjusting the bolt's advance and retreat on the strut.
The installation of the attachments of the tower crane should conform to the requirements of the manual of the tower crane. The free height of the spacing and above the point of the attached wall should not be arbitrarily long (the specific wall attached to the wall allows for proper adjustment in the 1m range according to the actual conditions of the building). Extra long attachment strut shall be additionally designed and checked for strength and stability.
The first attachment distance of the tower crane is 24 m from the foundation. With the increase of the joints of the tower crane and the corresponding attachment times, the maximum cantilever height of the tower crane can not exceed 27 M.
When the tower crane attachment installation is installed, the 2.5 frame is set on the standard section, and the standard joint is tightly hoop with 16 M20 connecting bolts between the two half frames, and then the pole supports the tower body. The attachment device connects one end of the attached pole to the attachment frame through the pin shaft, and the other end is connected with the embedded parts fixed on the building. A solid adherence structure.
The frame sleeve (also called ring beam) is welded by angle steel and steel plate. The frame sleeve is used on the standard section. The four angles are fastened to the standard section with 8 adjusting bolts through the top block, and the attachment frame is positioned on the standard section through the 4 hoops under the frame. The frame is connected with the building through 3 or 4 struts. The connection points of the pole and the building should be selected on the concrete column or the concrete ring beam. The embedded parts are combined with the concrete. The preembedded or cross wall bolts are connected with the structure of the building.
It is very dangerous to use expansion bolts instead of embedded parts or cable wind ropes instead of attachments, because attachment devices and their accessories and standard sections are the same 名媛直播 produced by manufacturers, and the use of substitutes reduces the strength and stability of the attachment.
