Large-Span Space Frame Structure in Circular Coal Yard (Part 2)

3.5 Aerial docking of block space frame

When the block space frame is docked, an installer is arranged for each connection point. After the installer receives the corresponding installation rod, the high-strength bolts are preliminarily screwed into the bolt balls 3~5 buckles. According to the installation conditions of other installers, After all the installation bolts have entered the bolt ball , fasten the high-strength bolts in place together . It is necessary to avoid that one or two high-strength bolts are tightened first , which will make it difficult for other high-strength bolts to be installed in place.

4. Subsequent space frameinstallation

1. After the block spaceframe is closed, it enters the high-altitude bulk of the space frame . The high-altitude bulk starts from the second ring belt of the upper string of the space frame. First , a crane is used to install the upper string small unit . When it is installed to the 1/4 ring belt , and add another crane to start installing the lower string unit , so that the ring is closed and installed circle by circle until the entire spherical shell is completely completed. According to the lifting height of the crane, the tonnage gradually increases, which are 25t (first 4 circles), 50t ( 5th to 9th laps), 100t (10th to 15th laps), 130t (remaining space frame), since the length of the main arm + auxiliary arm of the 50t truck crane is 57.7m, the maximum elevation angle is 78°, and the maximum The lifting height is 55m, the lifting capacity in this state is 2.5t, and the maximum weight of the triangular cone of the space frame is about 0.3t, so it can meet its hoisting needs; similarly, the length of the main arm + auxiliary arm of a 100t truck crane is 68.1m , the maximum elevation angle is 78° , the maximum lifting height is 65m, the lifting capacity in this state is 3.6t, and the maximum weight of the space frame triangular cone is about 0.3t, so it can meet its hoisting needs; similarly, the 130t truck crane The length of the main arm + auxiliary arm is 86 m, the maximum elevation angle is 78° , the maximum lifting height is 82m, the lifting capacity in this state is 2.9t, and the maximum weight of the space frame triangular cone is about 0.3t, so it can meet the requirements lifting needs.
2. During high-altitude bulk installation, each working surface can divide the installers into two parts, one part assembles small units on the ground, and the other part performs high-altitude installation. Unit, use a crane to hoist the small unit to the corresponding position of the installed space framein the air, and the personnel working at heights will complete the connection between the small unit and the space frame.
3. The small ground unit is also called a triangular cone, which is a small unit composed of a node ball and 3~5 rods on the ground. The small unit is divided into a small unit of the lower chord and a small unit of the upper When the installation is fastened in place , if there is a screw hole that is difficult to install, use a tap to repair the screw hole and then install it.

5. Small Assembly Unit Installation

During hoisting, there is an installer for each connection point at high altitude . After receiving the corresponding installation rod, the installer connects the high-strength bolt with the bolt ball hole. During the initial connection, 3~5 buckles should be screwed in first. According to the instructions of other installers, For the installation situation, after all the installation bolts have entered the bolt ball, fasten the high-strength bolts in place together. It is necessary to avoid a certain high-strength bolt from being tightened first, which will make it difficult for other high-strength bolts to be installed in place. The tightening sequence of high-strength bolts is to press the rod first and then pull the rod to prevent the rod from being pushed up when the tie rod is tightened first, resulting in the occurrence of bolt leakage.