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Tower crane

  • Added: 12.04.2016
  • Size: 424 KB
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Description

This is the calculation of the tower crane

Project's Content

Name Size
icon metallokonstrukcii_krana.rar
424 KB
icon Drawings_from_www.2d_3d.ru.txt
224 bytes
icon kursak.dwg
350 KB
icon KURSAKF.docx
137 KB

Additional information

Contents

1. Source Data

2. Vvedenne

3. Calculation of tower crane steel structure

3.1. Steel structure type justification and purpose

preliminary dimensions

3.2. Definition of design loads

3.3. Material Selection and Stress Limit Definition

3.4. Structural Steel Power Calculation

3.5. Structural Member Check Calculations

List of used literature

Source Data

1. Lifting capacity Q = 2 t

2. Lifting height H = 10 m

3. Maximum departure 8 m

4. Robot mode - average IR = 25%

Introduction

Tower cranes have become widespread throughout the world. They were used in housing, civil and industrial construction. Tower cranes are produced with a load moment from tens to several thousand tonometers and with a rise height of up to several hundred meters.

In construction, searches are constantly underway for new installation schemes for buildings and structures (using crane helicopters, by raising floors, etc.), but tower cranes were and remain the main means of mechanizing construction and installation robots. These cranes, dictating the pace and nature of construction, allow 98% mechanization of lifting and transportation operations during the construction of buildings and structures.

The tower crane refers to boom-type cranes and is a free-standing full-turn crane with an boom fixed in the upper part of the vertically located tower. The bearing steel structure is L-shaped, which provides the best coverage of the erected structures and allows to place the crane close to the object under construction. The useful departure of the tower crane is about 80% of the total departure, while for a boom crane with a low straight boom, it does not exceed 50% and decreases sharply with an increase in the height of the structure. If there is a goose (broken boom), the conditions for using the latter improve, but even then the crane must be moved away from the object by a distance of at least 30% of its height. In addition, other boom-type cranes are less maneuverable due to the difficulty of changing the departure.

Compared to goat cranes, tower cranes allow serving a larger front of work (construction plus a warehouse of materials), does not require the installation of a crane path on both sides of the object under construction. The appearance of tower cranes and their improvement led to the displacement of lifts, which, differing in cheapness, require additional costs for the horizontal movement of the load.

The massive use of tower cranes, capable of servicing almost any point of the construction site, led to the transition from construction from small elements to construction from blocks, panels and volume assemblies.

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