Tilt-up is a construction system which involves casting massive concrete fortifications on top of the slab or somewhere on site and then lifting It into position thus The name ‘tilt up.’ It is one of the fast-growing sectors because of efficiency.
Tilt-Up construction has reasonable costs, low maintenance, minimal capital investment and fast in construction. Just like any other project a Tilt-Up construction requires thorough planning to meet the desired output. There are various considerations to be followed when planning for such a project.
1. Site evaluation (site layout and topography)
It is essential to look at the site plan of a Tilt-Up project and assess if the entire proposed panel will fit on the slab or casting beds will be needed. The surrounding area should be flat and spacious enough for the casting beds and access path for the erecting crane. However, in case the panel can fit on the wedge, it will still be necessary to consider the crane’s access and movement of materials. Having a plan on pouring and erection sequence against the site and floor plan of the makeup can help to point out possible challenges before actual construction starts.
This is a crucial stage of Tilt-Up projects which involves consulting an experienced engineer who is conversant with this type of project and the modern design methods. The Tilt-Up panels have to be made to withstand lifting masses and service. The design should always be cost-effective and should not be a conservative one which increases the cost of construction.
Panel breadth is subject to thinness ratio which is the ratio of The unsupported panel stature to its width. The recommended ratio on Tilt-Up walls is 50, but this could vary as long as it is directed by a qualified engineer.
The slabs should be made to bear crane weights during erection. The structural engineer designs the slab thickness based on structural requirements.
The panel connections to footings, floor system, and roof and in between panels have to be made by an engineer before construction. The design drawing should have each panel showing both the front and back elevations. Insert and embed locations are not to be left out either in the picture.
3. Footings and floor slabs
The panels are erected on pad footings, continuous footings, grade beams, drilled beams, etc. depending on the design and cost factor. The location of The foundation, height, and dimension have to be cross-checked for correctness to avoid extra time charges on The Crane.
The slab should be well leveled to avoid affecting the appearance of The Tilt-Up panel. Contraction joints should be well placed where they will have less effect on the panel.
4. Panel design and formation
It is crucial to consider The maximum size panel that The rig can lift, The layout and access when designing The panel.
The floor block is marked to indicate The panel perimeters, and The forms placed against those lines. The side forms used are made of wood 2x’s and supported on The slab by a wood or steel angle support. For doors and window openings, The panel perimeter is framed and braced on The interior of The openings to avoid bowing or movement.
5. Surface treatments
Surface treatment involves imparting consistency or outline on The face of The Tilt-Up panels using divulge strips. The strips are attached to The base slab just after erecting sides but before placing reinforcement. Other surface treatment could be finishes of uncovered aggregate, sand ballast stone facings.
The steel reinforcement grid placement for the tilt-up panel comes after erecting The side forms. According to The structural design standard grade, 40 or 60 bars could be used. Use of plastic chairs is encouraged to avoid rust on the panel face.
7. Embeds and Inserts
Embeds are prefabricated steel plates with lugs which are cast into The panel to attach It to The footing, other panels or The roof for connecting construction accessories after The shell is finished.
Inserts provide attachment points for lifting hardware and braces.
8. Concrete Placement
Concrete placement for Tilt-Up panels is not different from that of slabs. Cleaning The base block and then ensuring The correct mix meets specification before pouring. There should also be proper flow of material around the reinforced steel. The panel is cured by water or a suitable curative compound.
9. Panel Lifting
Panel erection sequence should be planned and reviewed before assembly. There has to be right coordination with all the members to avoid accidents. Find insert and embeds and attach braces before lifting. You can remove braces once The roof and decks are installed.
10. Panel Finishing
Depending on The inventiveness of the designer and skills of The contractor a quality finish can be achieved. Sandblasted or bare combined finishes are mostly used and can be done straight away after erection followed by painting later once incomplete curing has taken place.
Contact these commercial constructions builders to know more on tilt up panels!