by Interpret the process flow of NPC component hoisting construction Key points of operation and quality requirements (NPC components – new prefabricated concrete new concrete prefabrication and assembly technology) · NPC shear wall component hoisting construction process: wall panel hoisting in place → support → correction → support reinforcement → slurry anchor pipe grouting → wall panel joint grouting construction process of prefabricated shear wall component hoisting operation process: 1.
The operator of slow lifting, fast lifting and slow placing shall be adopted for vertical component hoisting Type.
2.
20mm gap shall be kept between the bottom of vertical members and the floor to ensure the flow of grouting materials; Sizing blocks with different thickness of 1 ~ 10mm shall be used in the gap to ensure that the vertical components meet the design elevation after installation in place.
3.
Before hoisting the 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 greater than 0.5m.
The lifting speed shall be increased step by step, and the over gear operation shall not be allowed.
When the component is hoisted and lowered, the cable wind rope shall be tied at the root of the component to control the rotation of the component and ensure that the component is in place stably.
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 correspond to the reserved grouting pipes of the components one by one.
After all the grouting pipes are accurately inserted, the components will drop slowly; When the component is about 30cm away from the floor, the installer shall gently push the component or use a crowbar to preliminarily locate according to the positioning line; 5.
When the vertical components are in place, after the vertical components are basically in place according to the axis, component sideline and measurement control line, the upper and lower connecting plates of adjustable inclined support shall be used to temporarily fix the vertical components on the floor through bolts and nuts, and the hook shall be removed after the vertical components are basically perpendicular to the floor.
6.
The vertical members shall be hoisted in place in turn according to the plan division drawing and hoisting drawing of vertical members.
After the vertical members are in place, inclined supports shall be installed immediately.
Each vertical member shall be fixed with no less than 2 inclined supports.
The inclined supports shall be installed on the same side of the vertical members, and the horizontal included angle between the inclined supports and the floor shall not be less than 60 °.
1) Clean the pull bolts embedded on the ground, remove the plastic film wrapped on the surface and splashed cement slurry, and expose the connecting threads; Clean the sleeve on the component and install the screw.
Pay attention not to screw the screw to the end, and the gap with the component surface is about 30mm; 2) Installation of oblique support: the upper and lower base plates on the support rod shall be sleeved on the component and the bolts on the ground along the notch direction.
During installation, the base plate in one direction shall be sleeved on the screw, and then the support rod shall be rotated to sleeve the base plate in the other direction on the screw; 3) 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; 4) Rotate the diagonal brace to adjust the preliminary perpendicularity of the member; Loosen the component hook and hoist 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; 7.
Correct the perpendicularity of the vertical member with a plumb hammer or level, and rotate the adjustable inclined support intermediate steel pipe for fine adjustment until the vertical member 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 joint of groove joint of external wall shall be straight.
Quality requirements: item allowable deviation (mm) inspection method axis position 5 steel ruler inspection surface perpendicularity 5 theodolite or suspension wire, steel ruler inspection floor elevation ± 5 level gauge or stay wire, steel ruler inspection component installation allowable deviation ± 5 steel ruler inspection.
In case of damage to the external facing material of prefabricated components, it shall be repaired before installation.
Structural damage shall be determined by the design The construction and component processing units shall negotiate to meet the requirements of structural safety and use function· NPC precast composite beam hoisting construction process: precast composite beam hoisting in place → accurate correction of axis elevation → temporary fixation → support → hook loosening operation process: 1.
Check the number and direction of precast composite beam, the appearance, specification, quantity, position of lifting ring and the position of secondary beam opening, and select the steel beam shoulder pole for hoisting, The slings must correspond to the lifting rings on the precast composite beam one by one.
2.
Before hoisting the composite beam, the beam bottom elevation and beam sideline control line shall be popped out on the corrected wall with ink bucket line.
3.
Hoist the main beam first and then the secondary beam; The main beam must be calibrated before hoisting the secondary beam.
4.
The laying length of the 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 at one time according to the control line; 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 precast composite beam with the shear wall or beam reinforcement, and finally remove the sling.
5.
A precast 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 bottom formwork of the main beam and the independent support are in place at one time.
Quality requirements: 1.
When the horizontal members are in place, the temporary support shall be installed immediately, and the height of the temporary support shall be adjusted according to the elevation and sideline control line to control the elevation of the horizontal members.
2.
The distance between the temporary support and the horizontal member support shall not be greater than 500mm, and the distance between the temporary support and the horizontal member along the length direction shall not be greater than 2000mm; For laminated plates with a span greater than or equal to 4000mm, temporary support arching shall be added in the middle of the horizontal member, and the arching height shall not be greater than 3 ‰ of the plate span· Hoisting construction process of NPC prefabricated laminated plate: Hoisting laminated plate in place → support → correction of elevation and shelving point length → support fixation and reinforcement → hook loosening operation process: 1.
Check the number of laminated plate, the position and quantity of reserved holes and junction boxes, and the pointer direction of laminated plate shelving.
The operation mode of slow lifting, fast lifting and slow placing shall be adopted for the hoisting of laminated plate components.
2.
The lifting points of laminated plate components must be at the position indicated in the design drawing to maintain the lifting balance.
The lifting points shall not be less than 4 points, and the steel shoulder beam shall be used for multi-point lifting.
3.
Before hoisting the laminated plate, snap the elevation control line with ink bucket line on the corrected wall, recheck the support elevation of horizontal components, and cut, chisel or repair the deviation parts to meet the component installation requirements.
4.
The laminated plate components shall be hoisted in order, and the laying length of the laminated plate shall be 15mm.
5.
Install temporary supports 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 off the ground, and the sling shall be checked for deflection or jamming, and the stress at 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 place.
Quality requirements: 1.
When the horizontal member is in place, the temporary support shall be installed immediately, and the height of the temporary support shall be adjusted according to the elevation control line to control the elevation of the horizontal member.
2.
The distance between the temporary support and the horizontal member support shall not be greater than 500mm, and the distance between the temporary support and the horizontal member along the length direction shall not be greater than 2000mm; For laminated plates with a span greater than or equal to 4000mm, temporary support arching shall be added in the middle of the plate, and the arching height shall not be greater than 3 ‰ of the plate span.
3.
The temporary support of the laminated plate shall be installed at the edge of the plate along the stress direction of the plate, and the upper base plate of the temporary support shall be located in the middle of the plate joints of the two laminated plates to ensure the flatness between the butt joints at the bottom of the laminated plate· NPC prefabricated stair hoisting construction process: Prefabricated stair hoisting in place → correction of elevation and axis position → temporary fixation → support → loose hook prefabricated stair hoisting operation process: 1.
Check the stair rest platform, beam opening and elevation before hoisting of prefabricated stair components.
2.
Before the hoisting of prefabricated stair components, check the screw position of embedded sleeve, screw thread integrity, single piece weight, number, etc..
