Note: the drum of pulley, hoisting and boom luffing tower crane shall be equipped with steel wire rope anti falling device.
Do not lift if the safety device fails 10.
tower crane, according to the standard for safety inspection of building construction jgj59, the safety inspection and evaluation shall comply with the provisions of the current national standard safety code for tower crane gb5144 and the current industrial standard safety technical code for installation, use and disassembly of tower crane in building construction jgj196.
The load limiting device 1) shall be equipped with a lifting limiter, which shall be sensitive and reliable.
In case of staggered operation of multiple tower cranes on adjacent construction sites, their special use schemes shall be prepared on the basis of coordinating the mutual operation relationship to ensure that any two tower cranes do not touch.
The tower crane construction shall strictly comply with the operating procedures and achieve the following “10 no hoisting”.
The inspection and evaluation of tower crane shall comply with the “10 inspections”.
Attachment 1) when the height of the tower crane exceeds the provisions of the product manual, the attachment device shall be installed, and the installation of the attachment device shall meet the requirements of the product manual and specifications; 2) When the horizontal distance of the attachment device cannot meet the requirements of the product manual, the design calculation and approval shall be carried out; 3) Stress calculation shall be carried out for the building bearing structure installed with internal climbing tower crane; 4) The verticality of the tower body before and after attachment shall meet the specification requirements.
In severe weather such as rainstorm, Blizzard, heavy fog and gale above level 6, no two or ten inspections shall be carried out.
Hook, pulley, drum and wire rope 1) the hook shall be equipped with wire rope anti decoupling device, which shall be complete and reliable, and the wear and deformation of the hook shall be within the specified allowable range; 2) Pulley and drum shall be equipped with wire rope anti falling device, which shall be complete and reliable, and the wear of pulley and drum shall be within the specified allowable range; 3) The wear, deformation and corrosion of steel wire rope shall be within the specified allowable range, and the specification, fixation and winding of steel wire rope shall meet the requirements of instructions and specifications.
Small objects are not hoisted without basket or beyond the edge of basket 6.
The repair, inspection and scrapping of steel wire rope shall comply with the current national standard maintenance, maintenance, installation, inspection and scrapping of crane steel wire rope (GB / t5972).
when the trolley runs outward and the lifting torque reaches 80% of the rated value, the luffing speed shall be automatically converted to no more than 40m / min.
Note: the minimum erection distance between any two tower cranes shall comply with the following provisions: 1) the distance between the boom end of the low-level tower crane and the tower body of another tower crane shall not be less than 2m; 2) The vertical distance between the lowest part of the high-level tower crane (or the lifting hook rises to the highest point or the lowest part of the balance weight) and the highest part of the low-level tower crane shall not be less than 2m.
3.
Inspection and evaluation of general items 7.
The acceptance procedure shall meet the specification requirements, and tower cranes that have not been accepted or fail to pass the acceptance are strictly prohibited.
For tower cranes running on rails, limit devices shall be set in each running direction, including limit switches, buffers and terminal stops.
1.
When the lifting capacity is greater than the rated value of the corresponding gear and less than 110% of the rated value, the power supply in the rising direction shall be cut off, but the mechanism can move in the falling direction; 2) Lifting moment limiter shall be installed and shall be sensitive and reliable.
Multi tower operation 1) special construction scheme shall be formulated and approved for multi tower operation; 2) The minimum erection distance between any two tower cranes shall meet the specification requirements.
1、 10.
Protective device 1) the tower crane with trolley luffing shall be equipped with rope breaking protection and shaft breaking protection devices, which shall meet the specification requirements; 2) Buffer and stop device shall be installed at the end of track stroke of traveling and trolley luffing, and shall meet the specification requirements; 3) The tower crane with the height of the hinge point at the root of the jib greater than 50m shall be equipped with anemometer, which shall be sensitive and reliable; 4) When the top height of the tower crane is greater than 30m and higher than the surrounding buildings, obstacle indicator lights shall be installed.
Note: tower crane shall be equipped with lifting moment limiter.
Inspection and evaluation of guarantee items in the inspection scoring table of tower crane 1.
Do not lift when people stand on the lifting object or there are moving objects 7.
Do not lift objects when they are pulled askew 2.
Note: the tower crane with trolley luffing shall be equipped with two-way trolley luffing rope breaking protection device to ensure that the trolley will not move on the jib when the steel wire rope is broken before and after the trolley; The axle breaking protection device must ensure that the trolley cannot be separated from the jib even if the wheel fails.
2.
Lifting objects and accessories do not meet the safety requirements 8.
The surface that the device may contact with the steel wire rope shall not have edges and corners.
The limit switch shall ensure that the minimum distance between its end and the buffer is greater than 1m when the tower crane stops after the switch action.
5.
When the slewing limit operates in both positive and negative directions, the boom rotation angle shall not be greater than ± 540 °.
Do not lift if the load is overloaded or the weight is unknown 3.
General items shall include: ⑦ attachment, ⑧ foundation and track, ⑨ structural facilities and ⑩ electrical safety.
No hoisting is allowed if there is no command or multiple command, illegal command and unclear signal 5.
When the lifting torque is greater than the rated value under corresponding working conditions and less than 110% of the rated value, the power supply in the rising and amplitude increasing directions shall be cut off, but the mechanism can move in the falling and amplitude decreasing directions.
Note: before the installation of tower crane, the installation unit shall prepare a special construction scheme for the installation and removal of tower crane, which shall be approved by the technical director of the installation unit, submitted to the general contractor or the user and the supervision unit for review, and then informed to the construction administrative department above the county level where the project is located.
The “10 no lifting” and “10 inspection” of tower crane construction shall be strictly implemented on site! Tower crane, i.e.
6.
Lifting objects with sharp edges and prismatic objects shall not be lifted without protective measures 9.
The gap between the surface of the device and the outer edge of pulley or drum side plate shall not exceed 20% of the steel wire rope.
Guarantee items shall include: ① load limiting device, ② travel limiting device, ③ protective device, ④ hook, pulley, drum and steel wire rope, ⑤ multi tower operation, ⑥ installation, disassembly, acceptance and use.
Note: if the attachment arrangement of tower crane does not comply with the provisions of the manual, the attachment shall be designed and calculated and approved to ensure safety..
The travel limit device 1) shall be equipped with a lifting height limiter, and the safe overtravel of the lifting height limiter shall meet the specification requirements, and shall be sensitive and reliable; 2) The tower crane with trolley luffing shall be equipped with trolley travel switch, and the tower crane with boom luffing shall be equipped with boom amplitude limit switch, which shall be sensitive and reliable; 3) The tower crane with no collector at the rotating part shall be equipped with rotating limiter, which shall be sensitive and reliable; 4) Traveling tower crane shall be equipped with traveling stopper, which shall be sensitive and reliable.
The electric shock controlled by the torque limiter or the contact controlled by the constant amplitude code changing shall be set separately and can be adjusted separately; For tower cranes with trolley luffing, the maximum luffing speed exceeds 40m / min.
Installation, disassembly, acceptance and use 1) the installation and disassembly unit shall have professional contracting qualification and safety production license for hoisting equipment installation engineering; 2) Special construction scheme shall be prepared for installation and disassembly, which shall be reviewed and approved; 3) After installation, the acceptance procedure shall be performed, and the acceptance form shall be signed and confirmed by the responsible person; 4) Installation and disassembly operators, drivers and commanders shall work with certificates; 5) The tower crane shall be subject to routine inspection as required before operation, and the inspection records shall be filled in; 6) Implement multi shift operation, and fill in shift handover records as required.
Objects buried underground or stuck on the ground with unknown weight shall not be hoisted 4.
4.
If the safety distance between two adjacent tower cranes is not properly controlled, it is likely to cause major safety accidents.
Note: the tower crane without collector in the rotating part shall be equipped with rotation stopper to prevent cable damage.
