How to choose construction Tower Cranes
Tower crane (hereinafter referred to as the tower) is necessary in construction tower cranes.
Because of construction tower cranes own characteristics in stalling special way of working, it selects other construction machinery are quite different, according to the construction tower cranes specified in the construction process of structure.The different ways of building, choose different types of construction tower cranes is chosen the main principle of tower.
In addition, the transportation roads soil conditions, the underground structure to choose peripheral environment affects.
1)basic parameters The basic parameters of the tower is refers to the height, the arm length tower the arm speed (i.e. the farthest end) big arms hanging heavy maximum. Except for very special circumstances, the largest crane tower weighs generally does not need to consider. According to the building of the length, widthheight of the tower can be determined primarily size long arms. To ensure long arm, covering the entire projectslight surplus advisable. Currently, the arm of the tower is usually 50m, 30, 40 MB 60m, 70m 55m,several more arm,other conditions by site longer oxided limit is rarely used, when choosing, be careful. The high speed as higher than the maximum height building 10 ~ 15m. The construction tower cranes arm, given by the civil construction personnel to lift the weight of the body. General frame structure of building, hoisting speed for concrete measures to the hanging heavy, arm; And now concrete structure of the high-rise building, it is required. Above three parameters, the construction tower cranes type can be identified.
2 )construction tower cranes installation Speed is used on the ground of the equipmentits own weight (200t) than 1Ot ~ general engineering machinery, therefore the basic installation is installing needs to consider when choosing one of the major problems. Currently in widespread use of jack-up tower has three basic installations: namely large concrete blocks feet, big chassis fixed installationwalk type of pressurized installation. The installation of different requirements of different soil ground pressure (15-20t/m2, different types of ground pressure of the tower is different also, in addition in engineering slope based depth, also influence the basic installation, installing affect the speed of selection. It is certain to choose carefully readpractical experience, the product manual speed to use relevant basic part of the chapter, to determine the.
3)the determination of height The construction tower cranes can be used as building jack-up rather than speed, when the height of "freedom", if again after high rise, must adopt "wall" measures, is attached to the tower in the engineering construction tower cranes ,construction lift,construction elevator with "anchor" together. Different types of installing first attached the height of the wall of each different, the two "wall" the distance between attach different force. The attached on the wall oxided engineering have additional to the requirements, the tension of the completed project to reach a certain part of strength. If the construction speedwall part not reach the predetermined strength, it will affect the construction progress. This kind of circumstance should consider to choose freedom tower type of height. But in winter construction tower cranes is particularly important.
4)the surrounding environment Peripheral environment including transportation roads, underground pipeline , presence of high buildings around the high tension line etc. The construction tower cranes are heavier, long, long, construction tower cranes installation is generally 10m needed large transportation vehicleslarge tonnage crane. After the completion of the project, but also need the same equipment. So circumjacent environment for installing selection also to have certain restriction role. Sometimes the only large tonnage of the project can be finished installing. But because of the surrounding environment, compelled to choose two small tonnage of construction tower cranes to construction, Conversely, sometimes only a small tonnage of the tower. Well, if want to solve this construction tower cranes problem, the preliminary determination in the tower type,construction lift,construction elevator, seek professional oxided disassembling units (with the qualification approved by local appoint) to on-site investigation rear can finalize the design.
5)other factors to consider The above aspects of single construction tower cranes is independent of the selection principle of architecture. When building high altitude (more than 150m) can consider to choose within the paddle construction tower cranes, When building area is large regular shape when should choose multiple size high speed of joint configuration, allocation principles should cover completely, still should not interfere with each other, according to the different workcycle, the most appropriate in each stage of the tower,tower hoist,construction tower cranes. In addition, still should pay attention to the larger, general oxided electricity installation location for decades, as near kv transformer, the site also should avoid from high-voltage too close. In the selection principle of tower is very uncertain. In fact, the specific projects shall determine the types of speed, not corresponding to smalllarge, largesmall to also cannot.
Choose suitable for the building construction tower cranes of the project, the need to installing machinery,construction tower cranes installation, from three aspects of the staff have practical experience negotiations could draw more satisfactory results. If the error occurs, the selection of construction tower cranes may have caused great economic losses,accidents. Therefore, the selection of the tower is very important.
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