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Four, tower crane installation procedures and requirements
1, base:
The foundation of fixed tower crane is a necessary condition to ensure the safe use of tower crane. The foundation of this machine is constructed in strict accordance with the instructions in the basic part of the manual.
The tower crane foundation of this project is planned to adopt natural foundation, with the top elevation of-1 1.000, silty clay layer, bearing capacity of foundation 180KN/M2, and slope coefficient of tower crane foundation pit 1:0.25.
Two sides of the tower crane foundation pit near the slope are built with 240-thick MU 10 and M7.5 cement mortar red brick retaining walls, and the other two sides are built with 1/2 thick MU 10 and M7.5 cement mortar red brick retaining walls; Apply 20 thick 1:2 cement mortar on all surfaces.
The tower crane foundation of this project adopts reinforced concrete independent column foundation, the foundation center is set between ⑤ ~ ⑦ axis and m ~ n axis, and the top elevation of the foundation is -9.400, which is buried under the platform. The specification is (8.0 ~ 9.5) × 8.0× 1.5 thick (trapezoidal plane), and four piles are embedded below. See the attached figure, C25 concrete (see the arrangement of φ25 @ 120 bidirectional reinforcement below, with φ20 @ 400 in the middle (9010d hook at each end), and the reinforcement is distributed in two directions along the length and width direction to bind the upper and lower reinforcement;
The foundation concrete is poured in two layers, the first layer is 800 thick and the upper layer is 700 thick. After the fixing feet are installed and corrected, the foundation surface is poured again after the steel bars are bound. The construction sequence is as follows: tower foundation setting out → earthwork excavation of tower foundation pit → 100 thick plain concrete cushion and foundation pit retaining wall → measure the elevation lines around the pit wall with a level (level piles are driven at 800 height and 1500 height) → level and compact with a level. Welded firmly with steel backing plate) → Reinforcement binding on foundation surface → Pouring 700-thick concrete on foundation surface (second floor) 【 Observe whether the fixed leg deviates from two mutually perpendicular directions with two theodolite 】 → Pay attention to maintenance.
The tower will pass through the second floor underground at an elevation of -8.3, and four ground beams will be prepared, including ⑦ axis JL-2, m axis JL-3 and n axis JL- 1. The section height is changed to 1 100, and the reinforcement and reinforcement position are constructed according to the original drawings. When the ground beam concrete is poured, plain concrete with the same label as the original beam is poured under the original beam at the same time, and the added ground beam intersects with the foundation surface of the tower crane. When pouring the surface of tower crane foundation, on the center line of ground beam, use 30×30 embedded battens to leave tongue-and-groove water-stop joints.
At the basement floor elevation of -8.3, concrete will not be poured for the time being between the ⑤ axis and the ⑦ axis, and between the M axis and the N axis. Only within the reserved hole position of the beam peripheral plate and the thickness of 350, the upper Φ14 @ 200 bidirectional reinforcement and the lower Φ14 @ 200 bidirectional reinforcement of the beam peripheral plate all extend out of the beam for 350 long, and the other Φ 650 is attached.
The tower passes through the second-floor underground roof at an elevation of -4.5, and is ready to be connected with the civil air defense junction R04. The 300×700 beam between axis ⑤ and axis ⑤ moves 400 in the direction of axis ⑤. The distance from the beam to the ⑤ axis is 1800, and the distance from the foundation center to the M ~ N axis is 3650.
L9 and L 10 on1m axis and 2/M axis shall be constructed according to the drawings. The upper part of the beam peripheral plate φ 16 @ 14 @ 65438 is only allowed in the reserved hole position of the beam peripheral plate, and the plate thickness is within 300.
Steel bars all extend out of the beam for 350 long, with φ 16 @ 300 attached, and φ 14 @ 300 all extend out of the beam 180 long. After the tower crane is dismantled, formwork support, steel bar welding and micro-expansive concrete one grade higher than the original concrete are poured according to the original design requirements.
2. Before installation, proofread the concrete foundation and check the concrete test report to ensure that the concrete grade is not lower than the manufacturer's design requirements.
3. Fixed legs: four 800-high fixed legs and eight pin shafts are needed; 1 fixed frame and 8 pins; 1 tower standard section; 1 plumbum thallium and a level.
A. The fixed legs must be symmetrically installed according to the center line of the concrete foundation and laid with 40 thick steel plates;
B. The tower body is composed of fixed legs with components such as ∠200×20 angle steel and 600×600 square steel plates;
C. The installation size of fishplate must be150 mm; ;
D. The fixed legs shall be properly grounded according to electrical requirements;
E. Assemble the fixed leg and the fixed frame (the fixed frame is only used for temporarily burying the fixed leg);
F, placing the fixed leg and the fixed frame on the steel bar, and adjusting the position of the fixed leg with the wooden wedge below the fixed leg supporting plate;
G. After the standard section of the tower is installed on the fixed frame, check its verticality from two directions;
H, pouring tower crane foundation concrete, and after the concrete is dried, removing the fixed frame and the standard section of the tower body.
4. Install the foundation and the second quarter, pay attention to the direction of climbing claws, board the scaffold, and board the operating platform on the scaffold.
5. Connect the slewing mechanism, cab and operating platform into a whole on the ground, and install the possible electricity. Then, hang this assembly on the tower, connect it with a lock shaft and install a safety lock. Pay attention to the direction in the process.
6, lifting the top of the tower:
Before hoisting, install the platform escalator on the top of the ground, then install the top of the platform on the turntable and fix it with pins and bolts.
7. Assemble the balance arm and the pull rod lifting mechanism on it. Connect the steel wire of the main winch, lift the main part of the balance arm, connect the balance arm pull rod with the tower top point with a pin shaft, and connect the power supply.
8. In the positive direction of the tower crane (according to the site situation), assemble the boom and the pull rod pulley block, the trolley traction mechanism, repair the hanging fence, connect the boom with the front root of the tower cap with a car crane, and pull up the pull rod with the main winch to connect with the top of the tower.
9, heavy assembly, according to the requirements of the drawings can't dislocation, finally use screws to fix the counterweight.
10, connect the vehicle power supply, and thread the steel wire rope.
1 1. After the main tower is completed, check whether all the structures are firm and whether the transmission mechanism (including wire rope and pulley) is normal. Debug electrical and safety devices, and add components after confirmation.
Five, tower crane jack-up procedures and requirements
1, preparation before jack-up:
(1) Hoist the standard joint to the positive direction of the tower crane, clean the pin hole and pin shaft of the standard joint, apply grease, and carry out cleaning and refueling test on the hydraulic station.
(2) Put on the jack-up hook, lift the imported trolley, lift the first tower, pay attention to the direction, mount the imported track, knock off the connecting pin between the turntable and the tower, and the rotation is in a braking state. Jack up 15CM, introduce balance with trolley, and make the balance point fall on the top beam. /kloc-after 0/5 minutes, check whether the oil cylinder is slipping.
(3) In the process of jack-up, check the verticality of the tower from both sides to avoid deviation between the tower and the building.
2, the top work:
(1) After all parts are normal, jack-up is started. The pawls at both ends of the jack-up beam fall on the tower ears, the tower head is jacked up by 0.8m, and the pawls on the top beam fall on the tower ears. Retract the top beam of the oil cylinder and hang it on the upper pair of lifting lugs, then jack up the tower head and pull up the rack pawl. When the oil is fully extended, it will be about 1 m before the rack pawl can be installed. Retract the lifting beam of the oil cylinder and pull it to the upper pair of lifting lugs, then jack up the tower head and pull up the sleeve pawl. When the oil cylinder is fully extended 1.5m, be careful not to let the scaffold roller rush out of the tower, pull the scaffold into the imported trolley to make the standard section in place, turn the joystick to the lowered position, and the standard section will fall into the fishplate, connect it with a pin shaft, and insert a safety pin to lock the standard section.
(2) Lift the imported trolley, install the standard section and hoist it into the track. Drive the car to the balance point, remove the safety pin, and repeat it every (1) section until it reaches the required height. Before tripping in, connect the rotary table and the standard joint with 8 pins.
(3) In the process of jack-up, someone should open the hydraulic station and see the pawl and lifting lug clearly. When the wind speed is greater than level 4, jacking is not allowed. If there is any abnormality in the hydraulic system during jack-up, stop jack-up immediately, and nail the tower head on the tower. When the height exceeds the free height, bury the embedded parts in advance and attach them.
3, tower accessories
(1) This tower crane is composed of the fixed attachment frame provided by the manufacturer, and the bars and embedded parts are processed according to the drawings provided by the manufacturer.
(2) The estimated installation height of this project is 70 meters, and only one accessory is needed, which is determined to be at the height of 30 meters.
(3) The vertical distance from the tower center to the building is 3.5-5M depending on the actual situation.
(4) The horizontal error of the attachment rod shall not exceed 200mm.