ASME B30.3:2019 pdf free download – Tower Cranes
WithinthegeneralscopeoftheB30 Standard,asdefined in Section I of the B30 Standard Introduction, the B30.3 Volume applies to “construction tower cranes” and “permanently mounted tower cranes” that are powered by electric motors or internal combustion engines and that adjust their operating radius by means of a luffing boom mechanism, a trolley traversing a horizontal jib, or a combination of the two. The cranes may be mounted on “fixed bases” or “traveling bases” and may have tower and supporting structure arrangements thatpermitthe crane to climb in a structure being builtor that permits increasing the crane’s tower height as the structure rises. Variations of the above physical charac- teristics that provide the same fundamental operating characteristics are included in the scope of this Volume; however, the requirements of this Volume are only applicable to the cranes within this scope when they are used in lifting operations. Mobile cranes config- ured with tower attachments (refer to ASME B30.5) and self-erecting tower cranes (refer to ASME B30.29) are not within the scope of this Volume.
construction towercrane: a hammerhead, luffing, or other type oftower crane thatis regularlyassembled and disas- sembled foruse atvarious sites. Itis usuallycharacterized by provisions to facilitate erection and dismantling and may include features to permit climbing or telescoping. permanentlymountedtowercrane:ahammerhead, luffing, orothertypeoftowercranethatis erectedforlongerterm use atone location(5 yrormore). The configurationofthe crane usuallyremains unchanged duringthe entire instal- lation period.
bracedorguyedtowercrane: a tower crane with tie-ins or guys attached to the tower to permit the crane to be erected or climbed to greater than the maximum free- standing height (see Figures 3-0.2.1.2-2 and 3-0.2.1.3-1). freestanding towercrane: a tower crane that is supported on a foundation or structural support without assistance from braces, guys, orother means (see Figures 3-0.2.1.2-1 and 3-0.2.1.2-3). internal climbing tower crane: a tower crane arranged to raise itselffrom floor to floor in a building as construction advances (see Figure 3-0.2.1.3-2).
accessory: a secondary part or assembly of parts that contributes to the overall function and usefulness of a machine. administrative or regulatory authority: governmental agency, or the employer in the absence of applicable governmental jurisdiction. axis of rotation: the vertical line about which a crane swings. balance: the condition of the superstructure of a tower crane necessary for climbing; the load or the luffing boomis positionedatthatradius whichcauses thevertical moment ofthe superstructure about the balance point to go to zero. ballast: weight added to a crane base to create additional stability; it does not rotate when the crane swings.
bogie: an assembly of two or more axles arranged to permitboth vertical wheel displacementand an equaliza- tion of loading on the wheels. brace, tower: a structural attachment placed between a crane tower and an adjacent structure to pass loads to the adjacent structure and permit the crane to be erected to greater than freestanding height (see Figure 3-0.2.1.3-1). brake: a device, other than a motor, used for retarding or stopping motion by friction or power means. braking means: a method or device for retarding or stop- ping motion. buffer: an energy-absorbing device for reducing impact when a moving crane or trolley reaches the end of its permitted travel. cab: a housing provided for the operator and containing the crane controls. climbing: for freestanding, braced, or guyed cranes, the process whereby the height of the tower is increased by adding sections at the top (see Figure 3-0.2.1.3-1).