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Requirements for the installation of hoisting equipment 1.
The parts using PC technology shall be specified in the bidding documents.
Before the construction company selects the type of tower crane, it shall complete the PC conversion design of the construction drawing, so that the construction company can select the type of tower crane according to the maximum lifting weight, the farthest lifting weight and the operating radius; 2.
For projects where the wall adopts PC technology, full communication shall be made with the General Contractor 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 part of the tower crane; 3.
If PC prefabricated wall is used, 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 according to 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 connection seam grouting.
2.
Operation process: 2.1 The vertical components shall be hoisted slowly, quickly and slowly.
2.2 Keep 20mm gap between the bottom of vertical components and the floor to ensure the flow of grouting materials; The clearance shall be made of sizing blocks with different thicknesses of 1-10mm to ensure that the vertical components meet the design elevation after being installed in place.
2.3 Before the hoisting of vertical components, check whether the rings in the embedded components are intact, the specifications, models and positions are correct, and the component is not more than 0.5m above the ground during the trial hoisting.
The lifting speed shall be increased step by step and shall not be operated out of gear.
When the component is hoisted and lowered, the cable wind rope is tied at the root of the component to control the rotation of the component and ensure that the component is placed stably.
2.4 When the component is about 1.5m away from the installation surface, it shall be adjusted slowly 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 slowly descend; When the component is about 30cm away from the floor, the installation personnel shall assist in gently pushing the component or use crowbars to conduct preliminary positioning according to the positioning line; 2.5 When the vertical components are in place, the vertical components shall be basically in place according to the axis, component sideline and measurement control line, and then the vertical component floor shall be temporarily fixed by using the adjustable inclined support upper and lower connecting plates through bolts and nuts, and the hook shall be removed after the vertical components are basically perpendicular to the floor.
2.6 According to the plan division drawing and lifting drawing of vertical components, the vertical components shall be hoisted in place one by one.
After the vertical components are in place, diagonal bracing shall be installed immediately.
Each vertical component shall be fixed with at least two diagonal bracing.
The diagonal bracing shall be installed on the same side of the vertical components.
The horizontal angle between the diagonal bracing 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 connection screw thread; Clean the sleeve on the component and install the screw.
Note that the screw shall not be screwed to the end, and the gap between the screw and the component surface is about 30mm; Installation of diagonal support: cover the upper and lower base plates on the brace on the component and the bolts on the ground along the notch direction.
During installation, the base plate in one direction shall be sheathed on the screw, and then the brace shall be rotated to sheathe 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 component to be initially vertical; Loosen the component hook and hoist the next component.
Use a guiding rule to measure the vertical deviation of the component, and pay attention to measuring at the side of the component; 2.7 Use a plumb bob or a level ruler to correct the perpendicularity of the vertical component, and turn the middle steel pipe of the adjustable diagonal support to fine tune 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 tongue and groove joints are straight.
3.
Quality requirements: 3.1 The quality requirements are shown in the following table: 3.2 When the external facing materials of prefabricated components are damaged, they should be repaired before installation.
The structural damage involved should be handled by the design, construction and component processing units through consultation to meet the structural safety and use functions.
Hoisting construction process of prefabricated composite beams 1.
Process flow: hoisting prefabricated composite beams in place → accurate correction of axis elevation → temporary fixation → support → unhooking.
2.
Operation process: 2.1 Check the number, direction, appearance, specification, quantity, position, secondary beam opening position, etc.
of the prefabricated composite beam, select the steel beam shoulder pole for hoisting, and the sling must correspond to the lifting ring on the prefabricated composite beam one by one.
2.2 The elevation of the beam bottom and the control line of the beam edge line before hoisting the prefabricated composite beam shall be popped out on the calibrated wall with an ink bucket line.
2.3 Hoist the main beam first and then the secondary beam; The main beam must be calibrated before lifting the secondary beam.
2.4 The shelving length of precast composite beams is 15mm, and 1~10mm sizing blocks are used at the shelving points.
When precast composite beams are in place, their axes are controlled 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.
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 in place at one time.
3.
Quality requirements: 3.1 When horizontal components are in place, temporary supports shall be installed immediately, and the height of temporary supports shall be adjusted according to the elevation and sideline control line to control the elevation of horizontal components..
