What is precast concrete erection?- Ningbo Wewin Magnetics Co., Ltd

Precast Concrete Erection Process

Content

1 1. Pre-Erection Preparation
2 2. Component Receiving & Positioning
3 3. Lifting & Maneuvering
4 4. Temporary Support & Alignment
5 5. Structural Connection
6 6. Joint Treatment
7 7. Post-Erection Protocols

1. Pre-Erection Preparation

Site Readiness: Verify foundations are leveled with embedded bolts/plates positioned correctly.
Lift Planning: Sequence component installation (e.g., columns → beams → slabs).
Safety Zoning: Barricade areas under crane operation; assign signalers.

2. Component Receiving & Positioning

Laydown Staging: Place units near installation points using forklifts/trucks.
Rigging Setup: Attach slings to lifting inserts cast into the precast elements.
Crane Selection: Deploy tower or mobile cranes matching weight/radius requirements.

3. Lifting & Maneuvering

Lift Execution: Hoist units vertically to clear obstructions, then swing into position.
Anti-Swing Control: Use tag lines to stabilize elements during wind or movement.
Precision Guidance: Signalers direct crane operators via radio; lasers verify alignment.

4. Temporary Support & Alignment

Bracing: Install adjustable steel props to hold walls/columns plumb.
Shimming: Insert steel or polymer shims at bearings to achieve design elevation.
Tolerance Checks: Confirm positioning within ±3mm using surveying instruments.

5. Structural Connection

Connection Type	Method	Purpose
Bolted	Tighten high-strength bolts through steel plates	Immediate load transfer
Grouted Sleeves	Inject cement grout into rebar sleeves	Creates monolithic strength
Welded	Weld embedded plates or rebar tails	Permanent seismic resistance
Mechanical Couplers	Threaded rebar connectors	Rapid column-to-column joins

6. Joint Treatment

Weatherproofing: Install backer rods + silicone sealant in panel joints.
Fireproofing: Pack mineral wool at floor-to-wall gaps for fire ratings.
Architectural Finishing: Apply color-matchedural Finishing: Apply color-matched grout or mortar to exposed joints.

7. Post-Erection Protocols

Brace Removal: Detach temporary supports only after connections gain full strength.
Load Testing: Verify structural integrity (e.g., apply test loads to beams).
As-Built Survey: Document final positions for facility management records.