Tower cranes

The purpose of this standard is to specify the conditions to be met when confirming the stability of a mobile crane.

The purpose of this standard is to specify the conditions to be met when confirming the stability of a mobile crane.

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Tower cranes

6/23/2021 5:48:37 PM  ۰ Comment   ۱۷۰ Hits

1 Purpose and scope of application
The purpose of this standard is to specify the conditions to be met when confirming crane stability.
Mobile by calculation, assuming that the crane operates on a hard surface and level (up to 1% slope). Tires) or sand, with or without load protrusion.
2 mandatory references
The following required documents contain the provisions referred to in the text of this National Standard of Iran. Thus, those provisions are part of this National Standard of Iran. And its subsequent revisions are not considered in this national standard of Iran. Regarding the documents that have been referred to them without mentioning the date of publication, their latest revisions and subsequent amendments are always considered. Use of the following references is required to apply this standard:
. 1-2 Iran National Standard 10058 1387, Cranes - Wind Power Assessment
2-2 ISO 4306-1: 1990, Cranes - Vocabulary - Part 1: General.
2-3 ISO 4306-2: 1985, Lifting appliances - Vocabulary - Part 2: Mobile cranes.
2-5 ISO 4310: 1981, Cranes - Test code and procedures.
3 Stability calculations
كليات -1 3
The calculations must confirm that the crane is stable under the following conditions:
A- Criteria specified in Table 1
B- Criteria specified in Table 2
D. Stability to the rear (see paragraph 3.3)
E- Stability with off-service wind
2 3- Stability criteria
1 -2 3- Refer to Tables 2 and 1.
2 -2 3- According to the criteria specified in Tables 2 and 1, the limited stability of the crane should be
Can be used at a minimum wind speed of 8.3 meters per second. Under certain conditions somewhere
When a characteristic capacity limitation is required, the manufacturer must clearly specify the maximum wind speed intended for stability calculations.
Table 1
Configuration / loading machine conditions
The amount must be the item
1 to be considered
2 on balance bases / chain wheels
2 On wheels (tires)
On the sprocket / wheels (tires) when moving at speed
0.4 meters per second is allowed.
On the sprocket / wheels (tires) when moving fast
More than 0.4 meters per second is allowed.

25/1 P 1/0 + F
33/1 P 1/0 + F
33/1 P 1/0 + F

5/1 P 1/0 + F

1) In this formula:
P Characteristic capacity (average lifting load) as specified by the crane manufacturer for different crane configurations. ايـن
The capacity shall be for the average load of the crane lift specified in ISO 4306-1 (clause 3.5.1).
F load due to the mass of the arm and the movable arm sent to the open head or the head of the movable arm (. Determination of the load F according to ISO 4310
Be)
The value to be considered is in order to control the dynamic forces generated during normal operation.
Be simulated.
2) For these configurations, the state of the crane is fixed and is related to the movement of the crane as a whole, but to lifting, lifting, movement.
Sliding and rotating are not related.
Table 2
1 Configuration / Loading Machine Conditions The quantity must be considered
On balance bases / wheels
2 chains
Applied force 1/1 P
Wind power W
Inertial forces D
2 on wheels (tires)
Force applied 17/1 P
Wind power W
Inertial forces D
On sprockets / wheels
(Tires) When the speed of movement up
0.4 meters per second is allowed
Force applied 17/1 P
Wind power W
Inertial forces D
On sprockets / wheels
To (yers) when the speed of movement
More than 0.4 meters per second is allowed.
Force applied 33/1 P
Wind power W
Inertial forces D
1) In this column:
D Inertial forces are created by lifting, sliding, rotating, lifting or moving. For cranes with controls
Step by step, the actual amount of inertial forces must be applied. For cranes with continuously variable controls, the value of D must be zero
) 0 (to be considered.
P as defined in Table 1.
W is the effect of wind in the service and must be calculated in accordance with the national standard of Iran 10058 of 1387.
2) For these configurations, the state of the crane is fixed and is related to the movement of the crane as a whole (complete set), but to the equation.
Lifting, sliding and turning are not related.
3-3 Backward stability
To maintain an acceptable margin, the balancer must be distributed by mass distribution given by
Restrict device delivery in the following cases:
- Be placed on a level and rigid support surface (up to a slope of 1%).
- Equipped with the shortest specified arm set at the maximum arm angle for which the recommended arm length is.
- With hooks, block hooks or other load handling equipment located on the ground.
- With balance bases released from its support surface for calculations on wheels (tires).
Equipped with the highest specified arm, or a combination of arm and movable arm adjusted in
The maximum recommended arm angle for the combination and intended for wind action within the operating range of the lowest acceptable mass distribution criterion specified for each equilibrium condition should be rotated by the crane to the minimum allowable stability condition recommended by the manufacturer. There is, enough is enough.
1 3-3- Cranes installed on a sprocket
The total load on the anchor line (overturning line) next to or at the end of the undercarriage holder The minimum load shall not be less than 15% of the total weight of the crane.


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