Party A has a batch of equipment that needs to be hoisted in place, and Party B Beijing Gravity Chengcheng Lifting and Handling Co., Ltd. undertakes this work. After investigating the site construction conditions and contents, our company personnel formulated this construction scheme.
1. Compilation basis;
1. 1 Code for Construction and Acceptance of Mechanical Equipment Installation Engineering (GB 5023 1-98)
1.2 Code for Construction and Acceptance of Lifting Equipment Installation Engineering (GB 50278-98)
1.3 technical specification for the use safety of construction machinery (JGJ 33-86)
1.4 management system and regulations of our company.
Second, the project overview;
1, construction site:
2. Equipment overview: 3 water chillers, divided into 5 sets, with a maximum weight of about 2 1 ton; 6 water pumps, each weighing about 1 ton; 2 water collectors.
3. Construction content: Party B is responsible for hoisting and transporting the above equipment to the B2 floor machine room.
Third, the construction technology is initially determined;
According to the actual working environment on site, our company decided to use a 250-ton crane to lift the equipment to the entrance of the ramp, and then manually move the equipment along the ramp to B2 machine room.
Fourth, the requirements for site conditions in the construction process;
1. Requirements of crane operation site: clean up sundries that affect the construction.
2. Requirements for equipment handling path: As the equipment handling path (ramp) is uneven, it cannot meet the needs of equipment handling, so it is necessary to lay the equipment handling path with skids.
3. Power supply: Party A provides 380/220 power supply.
Five, the corresponding preparations before construction;
1. crane support: due to the limitation of site construction conditions, the crane cannot be supported at the entrance of the ramp, and needs to be supported outside the wall (south side of the ramp). According to the calculation, the radius of hoisting operation is 24m, and a 250t crane is needed to complete the hoisting of equipment according to the weight of the largest piece of equipment (2 1 ton).
When the crane entered the hoisting operation site, all the legs were properly and firmly supported, and the crane entered the best working state. When the crane works, the pole is 34m, the working radius is 24m, and the elevation angle is 70 degrees. In this state, the lifting weight is 30t, which meets the lifting requirements of the largest equipment (2 1t).
2. Set an equipment traction anchor point at the ramp entrance and the machine room respectively, and make a winch or winch. The anchor point form is as follows.
3. Because the equipment handling channel (ramp) is uneven, double rows of track wood are laid manually along the equipment handling channel to ensure the smooth progress of equipment handling.
4. In the machine room, use track wood to lay the transportation channel, which is equal to the equipment foundation platform, and set the traction anchor point.
5. The roll bar and equipment handling bracket should be placed above the track wood at the entrance of the ramp.
Six, construction methods and steps;
A. Equipment lifting and unloading
1. Command the equipment transport vehicle to enter the working radius of the crane.
2. After the unit is accepted by Party A and Party B and the manufacturer, the rigger will lock the rigging of the unit and hang it firmly with a crane hook under the guidance of the manufacturer's technicians.
4. After locking, start trial hoisting according to the command, and stop when the unit is hoisted to about 100mm from the bottom of the car.
5. Assign a special person to check whether there is any abnormality in each leg and live cable of the crane. If there is no potential safety hazard, it can be officially lifted only after everything is confirmed.
6. Under the command of the commander, lift the unit to the ramp entrance smoothly.
B. Horizontal handling on the first floor
1. Before the equipment falls to the ground, lay φ 80 roller and transport bracket.
2. First, use a winch or winch to wind the traction rope around the 4×4 pulley block and connect it with the traction point of the equipment (to prevent the inertia of the equipment from dropping after the hanging lock is removed). The crane lowers the rope and puts the equipment on the transport bracket. After the vehicle is completed, release the lifting lock and report to the commander.
3. The commander instructs to start the winch or winch to slowly release the rope, and the manual feeding takes inertia downward as the downward power of the equipment, and smoothly transports the equipment to the B2 floor machine room along the pre-laid equipment handling channel (double-row track wood).
4. Simple schematic diagram of equipment handling.
C. Handling in an appropriate position in the machine room
1. Under the guidance of the manufacturer's technicians, lay the equipment to the foundation handling passage, and carry it in place in turn according to the equipment discharge position in the machine room.
2. When the equipment is manually transported to the specified foundation, use the 10 ton crown block as the power to align and level the equipment in place according to the reference line.
3. After the equipment is in place, submit it to Party A for acceptance.
Seven, construction personnel;
2 commanders
1 security officer