What inspection should be done in the daily maintenance of the tower crane driver during mechanical operation?
For each technical maintenance project, the tower crane driver shall check the following conditions during the mechanical operation when the two shifts are handed over:
1. Check the adequacy of fuel for the engine(or starter).
2. Check the adequacy of the water tank.
3. Check that the engine(or starter) has sufficient oil in the bottom shell.
4. Check that the oil in the control box is sufficient.
5. Check engine performance for oil leaks, leaks, leaks, and more frequent tapping sounds. Low and high speeds need to work well.
6. Check the condition of the wire rope, especially the fastening of the connection.
7. Check whether batteries, generators, motors, speakers and lights are in good condition.
8. Check that the instruments are in good condition(as specified in the factory instructions for various machines).
9. The lubricating oil shall be added by each department according to the lubrication period, lubrication site and oil used in various mechanical lubrication charts.
10. Inspection of the work of institutions such as clutches, rotary walking mechanisms on brakes, lifting arms, pulleys, hooks, etc.. And carry on the operation test, if the fault is found, it should be removed in time.
11. Cleaning machinery externally
Common Situation of Foundation Construction of Tower and Construction Requirements of Various Conditions
[ Key words: Tap Hang Basic Release Date: 2012-05-05 11:59:12]
The common situation of the foundation construction of the tower crane? Requirements for Foundation Construction of Tower
1. Cases where the basis does not need to be addressed
When the base position of the tower is wide and the foundation layer is shallow, it can be directly constructed according to the base map of the tower. The base should meet the design requirements, generally 0.2-0 .3 MPa, which is easily satisfied or handled. In order to prevent groundwater flooding or safety, it is usually safer to place the base on a hard bottom. The part that exceeds the depth of the foundation can be poured with C15 stone gongs. It should be noted that the tower hanging foundation is often used as a piece of stone grit because the owner saves investment requirements. There have been construction units that have used mudstone as a piece of stone to cause the tower to collapse. accident.
2. Deep soil layer.
(1) The thickness of the soil layer is more than 8M. That is, the rectangular tomb foundation is used as a support platform, and 800 suitable rocks are dug in each corner, and the requirements can be met by structural reinforcement. The cross-shaped foundation is to dig 5 piles and review the internal reinforcement of the foundation.
(2) If the thickness of the soil layer exceeds 8M and the excavation pile is more and safer, a smaller diameter drilling pile may be considered for solution. At this point, the construction unit is required to provide a balance moment calculation book for the tower crane for inspection. The earlier manual did not provide data, and can only refer directly to the original foundation bearing capacity conversion of the anti-overturning moment as a basis, the calculation results are relatively conservative, and the requirements for the bearing capacity of the foundation are also high.
(3) The method of review calculates the anti-overturning moment according to the bearing capacity of the pile foundation and the distance between piles. This method has a clear form of force and is relatively simple to calculate.
3. Inadequate base positions.
This is generally the case where the base of the tower is just below the steep slope or the edge of the cliff, and its horizontal position can not be placed on the rectangular base of the tower(the cross-shaped foundation is not applicable). The construction unit reduces the foundation of the tower to ensure the mounting size of the tower body and places it on an enlarged independent pile foundation. This basic form can also be used in places where the soil layer is deep and the soil quality is poor.
The calculation of this basic form is more complex and should be used with caution. The calculation content is:
1. When calculating the balance moment and vertical load of the tower crane, the influence of wind load should be considered.
2. To determine the pile diameter, usually take 1.2 ~ 1.5 M(25-63 tower hanging).
3. Determine the depth of the embedded rock and the size of the extended head, and calculate the embedding moment.
4. Calculate the required foundation bearing capacity and compare it with the ground survey data.
5. Calculate the reinforcement and use the iterative method for direct calculation. When reviewing, the circular pile can be replaced with a square equivalent section to simplify the calculation, and an anti-drawing test should also be performed.
6. Construction requirements are handled according to pile foundation specifications.
Discussion on installing wireless operation equipment for tower crane, what are the advantages and disadvantages of wireless control
[ Key words: Tower Hang Wireless Operation Release Date: 2012-05-05 11:48:26]
How to improve the security of the tower crane control, the current tower crane is manually operated by the tower crane driver at high altitude. Why not replace it with wireless control operations on the ground, so that it can avoid huge safety problems caused by the sight of the tower crane driver. hidden danger, It is also possible to avoid the collapse of the tower and the injury of the driver. In addition, it is not necessary to hire an additional tower crane command to save labor costs.
If wireless control has such an advantage, why doesn't anyone produce such a tower crane? I think my predecessors should have thought about this design. There may also be many drawbacks. Who can tell me what disadvantages are, and knowing these disadvantages is very helpful to the design of the tower crane that I think should be entered.
There are two kinds of Tower suspension: fixed and moving. Why can tower suspension not control you by radio? This talks about the surface. From a deeper point of view, tower suspension is commonly used in all countries in the world. You Chinese say security, and Western developed countries attach more importance to security.
Why not radio control is because it is not possible to apply high wireless control with the height of the building. There are many technical types of programs that must be manipulated on top. From the point of view of human costs, people operate the most safely on top. The tower crane driver has a wide field of view. The disadvantage is that the outdoor level 6 Gale can not be operated, and the crane arm of the gale tower above level 8 must be lowered. The tower suspension brake is placed on the automatic block to turn off the power supply.
The future tower crane can use both manual and radio control. When the floor is too high, manual and wireless control can be used at the same time. The tower crane commander uses radio control below. Manual control is used when the cargo is raised to the visual range of the tower crane driver. In addition, when you are operating at night, you can basically see nothing on the tall tower crane. At this time, you can use radio control. The driver controls on the ground and is more secure.
