Analysis of bolt anchoring of rubber dam
The T-beam is often used as the side beam and longitudinal beam of the plane steel gate in the hydraulic steel gate, and the longitudinal beam of the main beam-type curved steel gate is also the T-shaped beam. Therefore, in addition to the I-beams and box beams, T-beams are often used in steel gates. This is a step further than making a T-beam in a single piece, but the T-beam that cuts the spot weld still has a large bending deformation. It is to cut the webs of two T-shaped beams into one whole piece, and weld the wing plates on both sides. Just like making the I-beam, after welding, the I-beam is cut from the middle of the web into two T-shaped pieces. Beam, this method is just an improved production method, and the deformation is still not small after cutting. Is there a better way to make a T-beam, so that after the weld of the web and the wing is welded, the beam is straight, that is, the web of the T-beam is prefabricated before the flange is folded. The reverse deformation method of bending. After the gates were put into production, different teams used different T-beam manufacturing methods as described above, and the results were very different. The T-beams that were not made by the inverse deformation method were severely deformed, and the maximum bending deformation reached 70. The Dingzhou team adopted the anti-deformation method. First, the side of the T-beam without the wing was heated by the flame of the roasting gun by 30 mm wide, so that the web was freely deformed and bent first, and the straightness was measured after cooling, and the bending was reached in the middle. . On the convex side, the wing pole is matched, and the automatic welding is performed for welding. After welding, the 5000 long T-frame is bent within 1 degree, which achieves the expected anti-deformation effect, reduces a large amount of correction time, and greatly improves work efficiency. The quality of the T-beam is also better guaranteed than other manufacturing methods.
T-beams with different lengths, different cross-section dimensions and different weld sizes are made by anti-deformation method, and the degree of web bending is different. This depends on the specific situation and the specific analysis, the closer to the scientific and reasonable analysis The amount of reverse deformation, the smaller the bending deformation of the welded T-beam, can even meet the requirements of straightness without further correction. It should be pointed out that the amount of anti-deformation of the control is slightly larger than that of the insufficient one, because the bending deformation of the wing-side projection caused by the T-dye is easy to correct, and vice versa. When the rubber slab bottom concrete meets the specification requirements, the bolting plate anchoring installation can be carried out according to the following steps: the pressure plate should be aligned at the beginning and the end, and the rubber sheet should be flattened when the unevenness is uneven; the upper nut should be tightened several times, and the dam bag water filling test After that, tighten the nut again; when using the upper nut, use a torque wrench to tighten the bolt one by one according to the set torque; the joint of the roller shaft (wood core or steel pipe) should be staggered from the joint of the pressure plate to avoid A soft seam appears, causing a partial leak.
Experience and experience in the construction process, in order to ensure the smooth installation of the anchoring groove, the bolt hole spacing must be accurate when making the pressure plate, and the error is allowed to prevent the dam bag from being tightly anchored, and the water leakage phenomenon occurs, and the welding can be performed at the lower part of the pressure plate. The steel bars are pressed to reduce the stress area of ​​the pressure plate and increase the anchoring pressure. The accurate position of the embedded bolt is the key to ensure the installation quality and installation progress of the dam bag. It is necessary to ensure the size is qualified, the positioning is accurate, and the elevation is correct, so as to ensure the smooth progress of the next project. In order to make the rubber dam easy to be repaired in the future operation management, the anchor groove should be sealed with concrete after the dam bag is tested without water leakage, and the disposable plastic cup can be placed on the bolt to prevent the bolt from bonding with the concrete. .
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