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Requirements for setting of hoisting equipment 1.
The position where PC technology is used shall be specified in the bidding document.
Before the construction unit selects the tower crane, the PC conversion design of the construction drawing shall be completed so that the construction unit can select the tower crane according to the maximum lifting weight, the farthest lifting weight and the operating radius; 2.
For the project where the wall adopts PC technology, the general contractor shall be fully communicated during the PC conversion design to confirm the location and elevation of the wall attachment point of the tower crane and confirm the wall attachment position of the tower crane; 3.
If PC prefabricated wall is adopted, confirm whether the prefabricated wall can meet the bearing capacity requirements of tower crane anchorage: 4.
The design, construction, installation and removal of tower crane foundation shall be carried out in accordance with the routine.
Hoisting construction process of shear wall components hoisting construction process of prefabricated shear wall components 1.
Process flow: wallboard hoisting in place → support → correction → support reinforcement → grout anchor pipe grouting → wallboard joint grouting.
2.
Operation process: 2.1 the hoisting of vertical components shall adopt the operation mode of slow lifting, fast lifting and slow releasing.
2.2 the bottom of the vertical member shall keep a 20mm gap with the floor to ensure the flow of grouting materials; Sizing blocks with different thickness of 1-10mm shall be used for the clearance to ensure that the vertical members meet the design elevation after installation.
2.3 before hoisting of vertical components, check whether the lifting rings in the embedded components are intact, and whether the specifications, models and positions are correct.
During the trial hoisting of components, the distance from the ground shall not be more than 0.5m.
The lifting speed shall be increased step by step and shall not be operated over the gear.
When the components are hoisted and lowered, the cable and wind rope shall be tied at the root of the components to control the rotation of the components to ensure that the components are in place smoothly.
2.4 when the component is about 1.5m away from the installation surface, it shall be adjusted slowly to adjust the component to the installation position; The reserved dowel bars on the floor shall correspond to the reserved grouting pipes of the components one by one.
After all the grouting pipes are accurately inserted, the components will slowly drop; When the component is about 30cm away from the floor, the installer shall gently push the component or use a crowbar to conduct preliminary positioning according to the positioning line; 2.5 when the vertical members are in place, after the vertical members are basically in place according to the axis, member side line and measurement control line, the adjustable inclined support upper and lower connecting plates shall be used to temporarily fix the floor of the vertical members through bolts and nuts.
After the vertical members are basically vertical to the floor, the hook shall be removed.
2.6 according to the plane division drawing and lifting drawing of vertical members, the vertical members shall be hoisted in place in sequence.
After the vertical members are in place, inclined supports shall be installed immediately.
Each vertical member shall be fixed with at least two inclined supports.
The inclined supports shall be installed on the same side of the vertical members.
The horizontal angle between the inclined supports and the floor shall not be less than 60 °.
Clean the pull bolts embedded on the ground, remove the plastic film wrapped on the surface and the splashed cement slurry, and expose the connecting thread; Clean the sleeve on the component and install the screw.
Note that the screw shall not be screwed to the end, and the clearance between the screw and the component surface is about 30mm; Installation of diagonal support: the upper and lower base plates on the support bar shall be sleeved on the components and the bolts on the ground along the notch direction.
During installation, the backing plate in one direction shall be sleeved on the screw, and then the support rod shall be rotated to sleeve the backing plate in the other direction on the screw; Tighten the bolts on the components and the nuts of the ground embedded bolts.
At the same time, check whether the embedded sleeves in the components and the ground embedded bolts are loose.
If they are loose, they must be treated or replaced; Rotate the diagonal brace to adjust the initial verticality of the member; Loosen the component hook and lift the next component.
Measure the vertical deviation of the component with a guiding rule, and pay attention to the measurement on the side of the component; 2.7 correct the verticality of vertical members by plumb bob or level ruler, and rotate the adjustable inclined support intermediate steel pipe for fine adjustment until the vertical members are vertical; Use 2m long guiding rule and feeler gauge to correct the flatness between vertical members to ensure that the wall axis and wall flatness meet the quality requirements, and the joints of the external wall are required to be straight.
3.
Quality requirements: 3.1 see the following table for quality requirements: 3.2 in case of damage to the external facing materials of prefabricated components, it shall be repaired before installation.
Structural damage shall be handled by the design, construction and component processing units through negotiation to meet the structural safety and use function.
Hoisting construction process of prefabricated composite beam 1.
Process flow: hoisting the prefabricated composite beam in place → accurately correct the axis elevation → temporarily fix → support → loosen the hook.
2.
Operation process: 2.1 check the number and direction of the prefabricated composite beam, the appearance, specification, quantity, position, secondary beam opening position, etc.
of the lifting ring, select the steel beam carrying pole for lifting, and the sling must correspond to the lifting ring on the prefabricated composite beam one by one.
2.2 before hoisting the prefabricated composite beam, the beam bottom elevation and beam side line control line shall be popped on the corrected wall with ink fountain line.
2.3 hoist the main beam first and then the secondary beam; Before lifting the secondary beam, the main beam must be corrected.
2.4 the laying length of the prefabricated composite beam is 15mm, and 1-10mm sizing block is used at the laying point.
When the prefabricated composite beam is in place, its axis control is in place once according to the control line; At the same time, the elevation of the beam bottom is adjusted through its lower independent support.
After the axis and elevation are correct, spot weld the main reinforcement of the prefabricated composite beam with the shear wall or beam reinforcement, and finally remove the sling.
2.5 a prefabricated composite beam needs at least two or more independent supports according to the span size.
At the junction of the primary and secondary composite beams, the bottom formwork of the main beam and the independent support shall be put in place at one time.
3.
Quality requirements: 3.1 when the horizontal members are in place, the temporary support shall be installed immediately.
The height of the temporary support shall be adjusted according to the elevation and side line control line to control the elevation of the horizontal members..
