Hollow Core Slab Plan

[Mickie Bottiglieri]

Thehollowcore production process begins with the drawing and design of a floor layout within a building. The usage of the building and loads applied will determine the depth, prestressed wire patterns and span of the slabs.

The design is accomplished using 3D CAD software. This can then be translated into a production plan for the hollowcore factory. Any additional details, such as the insertion of lifting pins, cut-outs and narrow units are included.

Production is accomplished by a team of factory operatives, and is often spread over multiple work shifts. Production planning is an important part of maximising efficiency and minimising waste of raw materials.

Hollowcore slabs are prestressed concrete elements. This means that they are reinforced by high strength, low relaxation steel wire or strand. The tendons are tensioned to a predetermined load prior to casting the slabs.

Due to the high forces involved, prestressing is a potentially dangerous operation, requiring strict health and safety procedures. It also requires specialist hydraulic equipment, either for single strand or multi-stressing.

Once the concrete has been batched to the requirements of the casting machine, it is delivered via a distribution system. Casting machines typically fall into 3 categories: extruders, slipformers and flowformers.

These can include: cleaning, oiling and wiring the beds, marking and detailing slabs, cutting slabs to required lengths, and equipment for lifting and stacking the finished product. Factories can range from labour intensive through to highly automated production.

The floor layout of hollowcore slabs in a building is designed using 3D CAD software. At this stage, design loads are used to calculate the depth and wire patterns of the slabs, depending on the spans required.

This is then translated into a production plan for the factory to maximise efficiency and minimise waste. Production plans include information such as cutting slabs to length, and detailing requirements such as insertion of liftings pins, notches and exposed cores.

I am fairly new to Revit and have used it only for architectural modeling so far. I'm trying to model the construction of a project that contains hollow-core slabs. I have managed to model and split the floor (with the precast extension) but the voids and profiles are not showing in the sections (screenshot added).

If you have a level in your model, but there is no view for it, go to "View" tab, then under "Plan Views" select type of the plan you need and after that select level for which to create selected plan(s).

Also, when drawing level, there is an option "Plan View Types..." in the options toolbar (usually under the ribbon) where you can select which plans Revit will create automatically when you draw your level.

It seems that this slab is missing "edit profile" capability: Now that I put one of these hollow core slabs on the second floor, I notice that it only could be lengthened but that this one instance put there cannot be conveniently modified with "edit profile", like some of the other generic floor types, to get an uneven floor shape. So that means that I will have to copy each one individually or array one to fill the entire floor, it seems. I also notice that I can change the widhts and revise the names of each new size accordingly with the "Edit Type" of Properties, which will make the creation of a complex floor laborius, but apparently I will have to do it that way.

Never used it but I would just draw a thick concrete slab and you can add circles in your section, if that's your concern, on your cross-section for the holes. You could also use Solid Cylinders on a layer you can turn off on the floor plan if you want but probably not worth it.

Since once it's in place you can't see the cores in the model, I'd just use a solid slab and create a symbol to use on your sections and ignore the rest. Unless of course you are using Softlist and then it may be different.

I've designed a residence that used Strescore materials to create a garage over a basement swimming pool room. The panels were supported by poured foundation walls with basically a deep brickledge on the inside for them to rest on. As for the Softplan drawing, it was done similar to what Keith described above. I made a cross section drawing and drew in the Strescore panel details.

Don't build them just cut the prefabricated doors to size. You can use spray foam on the top and bottom to keep the blank rigid. And if you need to cut off the jamb edge just glue in a new piece of lumber for the hinge or strike.

I have done this exact thing for kneewalls, under-stair closet doors and low clearance basements. I have even cut down louvered doors so that there is ventillation.

It's not worth building from scratch

Steve: Cutting down prefab slabs was the original plan and I may yet do that for some if not all. But I have knee wall doors that are 22x37, 25x35, and 29x35 or something like that ( width x height ) and the closet door is 40x60. If I had to cut up slabs, that'd be 2 prefab sides on all the doors and I'd have a lot of waste. Seemed easier to just put some planks around the perimeter between 2 sheets of hardboard. Would you cut down bifolds? Regular slabs would be too thick.

Since you suggested MDF frames which would mean that the edges of the door would be MDF, I'd use two pieces of light weight MDF (now there's an oxymoron) laminated together, for a paint grade door. If you want real wood on the edges that's a different story. If you want a standard thickness you could use 3/4 and 5/8 to make an 1 3/8 inch door.

Yes I have cut down bi folds before. It's not a problem .

And it's not 2 prefab sides- if you leave the top or bottom open and squirt in expanding foam you only have the strike or hinge side to deal with. In the past I have reused the original wood stile from the offcut. Just peel the outer plys off of it then give it a good belt sanding and slide it with glue back into the door blank add some spring clamps to keep it in place and you are done

By looking at a door manufacturer's dimensional specifications, you can determine how you might get a nice looking door panel for under-sized/non-standard doors. I had a project where I cut down 6-panel doors, and only used the top 4-panels for undersized doors. Depending on the door style, you might even be able to get more that one panel from a door slab. Take a look at Jeld-Wen's webpage and see if you find a solution for your project that is both functional and aesthetically pleasing: -wen.ca/images/pdf/sizing/Moulded_Door_Specifications_11_2015_Revised.pdf

Hello. Have you considered nail guns for better performance? You might need it if you ask me. I'll be planning new minimal designs for my home this summer. I would say choose your vehicles carefully. Good luck now! :)

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Choosing the right materials is key in the construction world, especially for parking buildings where durability and efficiency matter. Precast concrete is becoming the go-to for these projects because it's quick to install and lasts a long time. We sat down with Mangesh Dhumal , a pro in precast concrete, to compare two top choices: double-tee and hollow-core slabs. This chat digs into their costs, upkeep, and how to pick the best one for your needs. Dive in for essential tips straight from an expert and find out why precast could be perfect for your next parking project!

Mangesh: Absolutely. Precast concrete technology offers significant benefits, such as speed of construction, dimensional accuracy, and reduced labor requirements on-site. These advantages make it an excellent choice for quickly developing robust and durable parking structures.

Mangesh: Double-tee slabs are incredibly strong and durable, thanks to their T-shaped cross-section. This makes them ideal for supporting heavy vehicle loads, a common requirement in parking structures. They also offer excellent fire resistance. When prestressed, they can achieve greater load capacity and help reduce slab thickness, which is a huge plus.

Mangesh: Their solid construction means they are quite heavy, which might require heavier support structures and foundations. Also, their design offers less flexibility in terms of span lengths and configurations compared to hollow-core slabs.

Mangesh: Certainly. Hollow-core slabs are lighter, thanks to the voids in their construction, reducing loads on support structures and potentially saving costs. They offer more design flexibility, improved acoustics between parking levels, and similar to double-tees, benefit significantly from prestressing.

Mangesh: Yes, the presence of voids means they generally have a relatively lower load capacity and require be thicker than double-tees for equivalent loads. Fire resistance is also lower. Plus, the voids can increase the potential for cracking under certain conditions.

Mangesh: The choice really hinges on your project's specific needs. You need to decide based on load requirements, fire safety, budget constraints, and the benefits of prestressing. Consulting with experienced structural engineers is always the key to making the best decision for your project's success.

The new manufacturing execution system, Plant Control Floor, offers a complete solution to optimize hollow core slab production. Advanced tools for production planning, monitoring and analysis enable enhanced production efficiency and a casting process with zero interruptions.

The new system focuses on the efficiency of hollow-core slab production. It optimizes the use of production lines and work schedules and monitors the work progress. The main objective of the manufacturing execution system is smooth, continuous precast floor production.

The story behind the new software originated in active cooperation between Elematic and precast factories. Regular communication with production facilities forms the core of the development of Plant Control Floor.

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