Through the advanced computer aided design system, all kinds of processing equipment, skilled staff skills and practical application knowledge and experience, the long arm excavator ensures the structural strength, service performance and quality of the added long arm from stress analysis, material selection, technology and technology, design and production, etc. An internal buffer plate is installed in the extension arm of the excavator to bear the tension load, which prolongs the service life of the extension arm and the extension arm of the excavator.
If all the above three checks are normal, finally check the steel cable expansion system, remove the boom extension and boom retraction cables, and drive the boom by the expansion cylinder alone. If the boom expansion is free and there is no shaking or noise, when the boom extension and boom retraction cables are installed and tested for expansion again, if there is shaking or noise in the boom extension, the reason may lie in the steel cable expansion system. Failure of balance valve or air in oil pipe is also the main reason why the boom can't be retracted. If the air enters due to the leakage of oil inlet pipe, the leakage can be eliminated first, and then the control rod can be pulled repeatedly to make the gas return to the oil tank along the oil return path; if the balance valve is faulty,
Slowly unscrew the hollow bolt from the balance valve to the oil inlet of the lower chamber to let the hydraulic oil in the lower chamber of the expansion cylinder flow out of the joint gap slowly. At this time, the expansion arm will automatically retract under the self weight, and then check whether the small hole in the control oil inlet of the balance valve is blocked. The scheme of steel sheet pile cofferdam has unique advantages in the construction of some deep water and soft geological foundation. The main forms of steel sheet pile cofferdam are rectangle, polygon and circle. At present, the design and construction of steel sheet pile cofferdam mainly rely on experience algorithm,
However, this algorithm often has a big deviation from the actual situation, which is the factor of the instability of the cofferdam. If we solve the actual stress condition of the cofferdam from the theoretical algorithm, we can reasonably arrange the internal transverse brace, so as to maintain the stability of the steel sheet pile cofferdam. During the construction of steel sheet pile cofferdam, the construction preparation must be done first, mainly including rechecking steel sheet pile, checking vibration hammer and handling steel sheet pile, etc.
In this project, dz-60y vibro hammer and 15t crane are used for operation. In order to ensure the smooth operation of the project, a series of operation tests are carried out on the vibro hammer before driving. The results show that the vibro hammer function is normal. In order to remove the deformed steel sheet piles that are worn due to loading and unloading transportation, the steel sheet piles are inspected in detail before assembling, and the lock opening fracture and surface are also inspected The steel sheet piles with welding residues shall be treated to ensure that the separate steel sheet piles of cofferdams have the same lock mouth, and appropriate butter shall be applied in the lock mouth to reduce the friction between the steel sheet piles.
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