ASME B30.3 pdf download.Tower Cranes.
SECTION 3-0.1: SCOPE OF B30.3
Within the general scope ofthe B30 Standard, as defined 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 lulling 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 that permit the crane to climb In a structure being built or that permits increasing the crane’s tower height as the structure rises. Variations of the above physical characteristics 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 configured with tower attachments (refer to ASME 830.5) and self-erecting tower cranes (refer to ASME B30.29) are not within the scope of this Volume.
SECTION 3-0.2: DEFINITIONS
3-0.2.1 Types of Cranes
3-0.2,1.1 By Type of Application
construction tower crane: a hammerhead, luffing, or other type of tower crane that is regularly assembled and disassembled for use at various sites. It is usually characterized by provisions to facilitate erection and dismantling and may include features to permit climbing or telescoping.
permanently mounted tower crane: a hammerhead, luffing. or other type of tower crane that is erected for longer term use at one location (5 yr or more). The configuration of the crane usually remains unchanged during the entire installation period.
3-0.2.1.2 By Method of Load Positioning
hammerhead tower crane: a tower crane with a horizontal jib and a load trolley that traverses the jib to change load radius (see Figures 3-0.2.1.2-1 and 3-0.2.1.2-2).
(4) maximum working radius of the jib or luffing boom
(5) structures that are inside of or within 6 ft. 6 in. (2 m) of the end of the jib or lulling boom
(6) known hazards, including, but not limited to, power lines, train or light rail tracks, occupied structures within the working radius of the crane, restricted air space, areas accessible to pedestrians, public roadways and streets, and subsurface constructions
(7) working radii of other tower cranes and material placement booms, and the location of construction hoists, on the same site or adlacent sites that may Interfere with the planned operation of the crane
(8) the crane’s electrical requirements, indicating the voltage, amperage, phasing, grounding, and any other electrical information specific to the crane
(b) Consideration shall be given to the geographic location at which the crane is to be erected with regards to
(1) wind in accordance with para. 3-1.1.5.
(2) ambient temperatures, both minimum and maximum.
(3) salinity, chemical, or other adverse environmental conditions.
(4) soil and ground conditions.
(5) The location and size of all excavations in the proximity of foundations, supports, and rail supports that could affect the stability of the crane shall be evaluated and approved by a qualified person.
SECTION 3-1.3: CRANE BASE SUPPORTS
(a) Crane base supports shall be designed, constructed, and installed to support the loads applied by the crane during in-service and out-of-service conditions and be able to transmit these loads to the supporting medium. With the exception of cranes mounted on static or traveling undercarriages, all supports shall be designed to resist the maximum overturning moment created by the crane operations and out-of-service conditions, when acting at the support.
(b) Anchoring blocks for guys, when used, shall be anchored or arranged so that their resistance to lateral movement, pullout, or overturning is a minimum of 150% of the anticipated force applied by the crane operations.
(c) Rails shall be attached to their supports in a manner that Is capable of resisting the horizontal loads as determined by the crane manufacturer or by a qualified person.
(d1 Splices in rail tracks shall have rail head mating surfaces that are sufficiently smooth so as to not adversely impact the operation of the crane.
(e) When required by the site plan, a section of the track shall be designated, arranged, and constructed as an out- of-service parking area.
ASME B30.3 pdf download
