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The editor will share with you the process flow, operation points and quality requirements of the lifting construction of PC components.
The hoisting of prefabricated shear wall components (1) The hoisting of vertical components shall adopt the operation mode of slow lifting, fast lifting and slow release.
(2) 20mm gap between the bottom of the vertical component and the floor to ensure the flow of grouting material; The gap is made of 1~10mm pad iron with different thickness to ensure that the vertical components meet the design elevation after installation.
(3) Before lifting the vertical components, check whether the lifting rings in the embedded components are intact, and whether the specifications, models and positions are correct.
The height from the ground during the trial lifting of the components is not more than 0.5m.
The lifting speed shall be increased step by step and shall not be operated over the gear.
When the component is hoisted and lowered, the root of the component shall be tied with the wind rope to control the rotation of the component and ensure that the component is in place smoothly.
(4) When the component is about 1.5m away from the installation surface, it should be adjusted slowly to adjust the component to the installation position; The reserved joint bars on the floor correspond to the reserved grouting pipes of the components one by one.
After all of them are accurately inserted into the grouting pipes, the components will slowly decline; When the component is about 30cm from the floor, the installation personnel shall assist in gently pushing the component or use a crowbar to carry out preliminary positioning according to the positioning line.
(5) When the vertical component is in place, after the vertical component is basically in place according to the axis, component side line and measurement control line, the adjustable diagonal support upper and lower connecting plates are used to temporarily fix the floor of the vertical component through bolts and nuts, and the hook is removed after the vertical component is basically vertical to the floor.
(6) According to the plane division drawing and lifting drawing of vertical components, the vertical components shall be hoisted in place in sequence.
After the vertical components are in place, the diagonal bracing shall be installed immediately.
Each vertical component shall be fixed with at least 2 diagonal bracing.
The diagonal bracing shall be installed on the same side of the vertical component.
The horizontal angle between the diagonal bracing and the floor shall not be less than 60 °.
(7) Clean up the pre-embedded connecting bolts on the ground, remove the plastic film and splashed cement slurry wrapped on the surface, and expose the connecting thread; Clean the sleeve on the component and install the screw.
Pay attention that the screw should not be screwed to the end, and the gap between the screw and the component surface is about 30mm.
Installation of diagonal support: put the upper and lower base plates on the brace on the bolts on the component and the ground along the notch direction.
During installation, first cover the base plate in one direction on the screw, and then turn the brace to cover the base 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 sleeve in the component and the ground embedded bolt are loose.
If they are loose, they must be treated or replaced.
Rotate the diagonal brace to adjust the initial verticality of the component; Loosen the component hook and hoist the next component.
Measure the vertical deviation of the component with a guiding rule.
Pay attention to the measurement at the side of the component.
(8) Calibrate the verticality of the vertical component by using a plumb bob or a level bar, and turn the adjustable diagonal support middle steel pipe for fine adjustment until the vertical component is vertical; Use a 2m long guiding rule and feeler gauge to correct the flatness between vertical components to ensure that the wall axis and wall flatness meet the quality requirements, and the joints of the external wall groove joints are required to be straight.
Prefabricated composite beam hoisting (1) Check the number, direction, appearance, specification, quantity, position, and secondary beam opening position of the prefabricated composite beam, and select the steel beam carrying pole for hoisting.
The sling must correspond to the lifting ring on the prefabricated composite beam one by one.
(2) The elevation of the beam bottom and the control line of the beam side line before lifting the prefabricated composite beam shall be snapped on the corrected wall with ink lines.
(3) Lift the main beam first and then the secondary beam; The main beam must be calibrated before lifting the secondary beam.
(4) The laydown length of the precast composite beam is 15mm, and 1~10mm pad iron is used at the laydown point.
When the precast composite beam is in place, its axis control shall be in place according to the control line at one time; At the same time, adjust the beam bottom elevation 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.
(5) A prefabricated composite beam needs at least two or more independent supports according to the span size.
At the junction of primary and secondary composite beams, the main beam bottom formwork and independent support are in place at one time.
Prefabricated laminated plate hoisting (1) Check the number of the laminated plate, the location and quantity of the reserved holes, the junction box, and the pointer direction of the stacked plate.
The operation mode of slow lifting, fast lifting and slow release shall be adopted for the hoisting of laminated plate components.
(2) The lifting points of the laminated plate components must be at the position indicated in the design conversion drawing to maintain the lifting balance.
The lifting points shall not be less than 4 points, and the steel pole beam shall be used for multi-point lifting.
(3) Before lifting the laminated plate, mark the elevation control line on the corrected wall with ink bucket line, recheck the support elevation of the horizontal component, and cut, chisel or repair the deviation part to meet the component installation requirements.
(4) Lift the laminated plate components in sequence, and the laydown length of the laminated plate is 15mm.
(5) The temporary support shall be installed when the laminated plate members are hoisted in place, and the upper and lower temporary supports shall be in the same position.
(6) During hoisting, the horizontal member shall be lifted about 500mm from the ground, and the sling shall be checked to see if it is twisted or jammed, and the force on each lifting point shall be uniform.
When the installation position of the laminated plate member is close to 1000mm, the member shall be stabilized by hand and then slowly lowered into position.
Prefabricated stair hoisting (1) Check the stair rest platform, beam opening and their elevation before hoisting the prefabricated stair components.
(2) Before hoisting prefabricated stair components, check the position of embedded sleeve screws, thread integrity, single piece weight, number, etc.
(3) Tighten the eyebolt and the embedded sleeve, adjust the length of the iron chain of the sling, make the rest platform of the stair section in a horizontal position, try to lift the prefabricated stair board, check whether the lifting point is accurate, and whether the sling is evenly stressed; The trial lifting height shall not exceed 1m.
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