Dapeng Town Industrial Park, Tongshan District, Xuzhou City, Jiangsu Province, China
Flat installation method of dome space frame：
1.Put the ball: Put the accepted welding ball into the installation node according to the specification and number. At the same time, the direction and position of the force should be adjusted. Generally, the circular weld on the horizontal centerline of the ball is placed in the equator direction. The ribbed side is in the upper half of the bottomchordball:
2.Placing the bars: Before placing the prepared bars and arranging the steel pipe bars according to the specified specifications, check the specifications and dimensions of the bars, as well as the groove and weld gap, and place the bars between the two balls. , Adjust the gap, and fix it.
3.The assembling of the flat space frameshould start from the center line and gradually expand to the surroundings, forming a closed quadrilateral grid first, and after controlling the size, then assemble the surrounding grids to expand continuously. Note that the cumulative error should be controlled. Generally, a negative tolerance is appropriate for the grid.
4.For flat space framewelding, the welding process and gridconnection sequence should be prepared before welding to prevent deformation of the flat space frame.
5.Flatspace framewelding should follow the welding process regulations, starting the arc from 20-30mm to the left of the center line of the lower side of the steel pipe, welding to the right, and gradually completing welding positions such as overhead welding, main welding\climbing welding, and flat welding.
6.Welding of ball tube should be done with oblique zigzag strips techniqueto prevent meat biting.
7.After welding and transporting the strip to the center line of the upper side of the round tube, continue to weld forward to end the arc at a distance of 20-30mm.
8.After the semicircle is welded, start the arc again from the 20-30mm right side of the center line of the lower side of the steel pipe, and weld to the left. The process is the same as the above process. After reaching the center line of the top, continue to weld forward to fill the arccrater and weld. The lap joint is stable to ensure the quality of the weld.
Assembly of the main part of the space frame:
a) Check and accept the size of the flat space frame and the axis deviation. After the inspection is correct, continue to assemble the main space frame.
b) Hang the small unit of a ball with four bars (one ball is the top chord ball, and the four bars are the diagonal web member of the space frame) into the top of the flat space frame.
c) After the small assembly unit, check the space frame size, vector height , and the angle of the diagonal web member of the small assembly unit. If the position or angle is not correct, correct it first, and then install it only after the correction is qualified.
d) When the length and angle of the bars of the small joint unit are found to be inconsistent during installation, the over-long bars should be cut off with a cutting machine, and then re-opened the groove and re-checked.
e) If you need to use the liner grid, you should spot weld the welded liner on the ball. But the small assembly unit should not be spot welded with the flat space frame for the time being, and the positioning welding can only be done after matching with the top chord member.
Top chord assembly and welding of steel space frame:
1) Put in the longitudinal members of the top chord flat space frame, and check whether the longitudinal position and size of the top chord ball are correct.
2) Put in the transverse members of the top chord flat space frame, and check whether the transverse position and size of the top chord ball are correct.
3) Through appropriate adjustment of the diagonal web member of the stereoscopic small assembly unit, the longitudinal and transverse bars of the upper chord and the welding balls are correct. The adjustment method of the diagonal web member is to cut the over-long bar, or use the chain block to pull the angle of the diagonal web member to make the bar correct. Ensure the correct size of the top chord grid.
4) Adjust the gap of each part. After the gap of each part is basically qualified, then spot weld the top chord member.
5) After the top chord member is fixed, spot weld the weld line between the bottom chord ball and the diagonal web member to make the connection firmly.
6) Check the space frame size step by step and move forward step by step. The installation of the web members and the top chord member of the space frame should be carried out in coordination with each other.
7) After the ground installation of the space frame is completed, acceptance shall be carried out according to the overall dimensions of the strips or blocks where the space frame is installed.
8) The space frame to be hoisted must be hoisted (lifted) only after the welding process is completed, the appearance quality of the weld, and the ultrasonic flaw detection report of the weld is qualified.
