In the installation of the grid, the steel ball is too small, which may cause the rods to collide and the installation work is blocked. On the contrary, in the construction of large-scale grids and special-shaped grids, steel balls are often too large, which is affected by various factors such as market, processing and on-site installation, which ultimately hinders the installation work. To solve the problem that the steel balls are too small and cause the rods to collide, the following methods can be used to adjust:
(1) If conditions permit, the large ball can be changed or the corresponding bar can be modified.
(2) If the conditions are not allowed, the cone and the rod of one of the interference parts of the counter-bar may be cut off, and then a repair welding of 24 mm thick than the wall of the tube may be copied. The edge of the cone and the part of the rod that is cut off from the rod and the repaired steel plate shall be opened. After the repair, the wheel shall be leveled by hand, and the rust-repellent rust-preventing primer shall be removed.
The above treatment method should be carried out under the premise of checking the force condition of each member in the computer book, and follow the following principles:
(1) When the stress is close, it is easy to treat the pressure bar. Because the pressure bar is affected by the initial bending and the Euler critical force, the bearing capacity of the central section of the bar is reduced more, and the cross section of the bar is very rich;
(2) taking the less stress in the two rods;
(3) For rods with similar stresses, take the larger cross section to reduce the percentage of section weakening.
(4) For the bars with relatively large stresses, it is advisable to cut a part of the bars and repair them again, in order to reduce the percentage of the weakened sections.
In order to prevent the rods from colliding, a large scale detail map is drawn for the nodes in question. The basic approach is to perform computer-aided design on the detailed processing of the grid. In order to solve the inconvenience caused by the market, processing, on-site installation and other factors due to the excessive influence of the steel ball, and the inconvenience caused by the construction of the grid, the following methods can be used for processing: when the bolt ball is too large, it can be used in the grid construction drawing. In the middle, change the bolt ball with a diameter larger than 300mm to a bolt ball of 300mm. During the manufacturing process, the bolt ball with a diameter of 300 mm is processed according to the angle of the bolt hole on the original ball, and then the interference is checked and processed. A method of applying a soldering sleeve to the connecting plate is usually employed. The treatment method should follow the following principles:
(1) The connecting plate is made of 45 steel steel plate of 20mm or more, and the cross-sectional area of ​​the steel plate and the ball connecting portion should be greater than 0.6 times the sum of the cross-sectional areas of the two connected rods.
(2) The nut is made of solid 45 steel bar larger than the sleeve 10mm, and the thread processing technology is the same as the bolt ball.
(3) Welds are welded by type 5 welding rods. Measures should be taken to prevent welding deformation during welding.
(4) Mechanical tests should be carried out on nodes with large forces.
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