Steel Detailing | Precast Detailing | Estimation

Tag: precast panel

  • Panel Gaps and Dummy Grooves

    Panel Gaps and Dummy Grooves

    The video explain relationship of panel gaps and dummy grooves.

    As detailer you have RFI what is the panel chamfer and Size of Dummy groove.

    The RFI should be addressed the to precast panel manufacturer and not anyone else.

    If you get this wrong, there will be a fair bit of rework.

    Hence it is important that this is address

    For more videos like this visit.

    Precast Panel Detailing

  • STRONGBACK AND TYPES

    Normally we are using the strongback in window, Door opening, uneven profile and panel handling purpose. It’s used to avoid the panel breakup, crack and damage during the panel lifting from table, Transportation (Loading & Unloading) and Panel erection on site. We are using three types strongback based on the required strength.

    1. PFC Strong back.
    First is the PFC member which can be bolted to the face or welded to plates on edge.

    2. RHS (Right hand side) Strongback.

    Second is the New and preferred RHS which is bolted to the panel face.

    3. Elbow Strongback.
    Third is the Elbow strongback which is bolted to the panel face and hangs over one edge.

    PFC and RHS Strongback used in SHOP DRAWING.

    Strongback Photos reference for PRECAST PANEL.

  • VIBRATING TABLE FOR PRECAST FABRICATION

    • Vibrating table using for compacting and consolidating the stiff and harsh mixes in precast structures on factory or yards.
    • While using this vibrator the concrete will be spreads equally at all corners of the precast structure in mold.
    • It will help to improve the strength and quality of precast concrete structure.
    • The void or bubble formation will be avoided.
    • So, the cracks formation also to be reduced.
    • It will reduce the man power.
    • The fabrication time is less.

    Fig.01 (Vibrating table)

  • VARIOUS SPANDREL PROFILES

    • Spandrel profiles are designed based on architectural aspects on Elevation purpose.
    • When doing this kind of profiles, it’s challenging and more interesting to achieve.
    • And also, it will help to improve our drawing knowledge and skill.
    • We handled and come across different types of precast spandrel profiles as per below,
    1. Spandrel with straight profile
    2. Spandrel with curve profile
    3. Spandrel with curve & triangle profile
    4. Spandrel with L shaped profile
    5. Spandrel with U shaped profile
    6. Spandrel with V shaped profile
    7. Beam type spandrel1. Spandrel with straight profile (Ref. Fig.01)

    Fig.01

    2. Spandrel with curve profile (Ref. Fig.02)

    Fig.02

    3. Spandrel with curve & triangle profile (Ref. Fig.03)


    Fig.03

    4. Spandrel with L shaped profile (Ref. Fig.04)

    Fig.04

    5. Spandrel with U shaped profile (Ref. Fig.05)

    Fig.05

    6. Spandrel with V shaped profile (Ref. Fig.06)

    Fig.06

    7. Beam type spandrel (Ref. Fig.07)

    Fig.07

  • PURPOSE OF SPANDREL OVER ON MARKING PLAN

    • When preparing marking plans, we need to show all spandrels set-outs on the plan layout that are fixing into the slab over. (Refer Fig.01 & 02)
    • It will help to find out which spandrel comes at level above.
    • While scheduling the current level panels, mean time it will helps to scheduling the above level spandrels.
    • And, it will help to manufacturing and erecting the spandrels with lower-level panels at same time.
    • For site crews, they also aware when pouring slab and erecting panel sequence without any time delay on site with reference marking plan.
    • It will reduce time consumption to plan for both manufacturing and erecting panels.
      Fig. 01 (Snap for Reference Marking Plan)

    Fig. 02 (Snap for Reference Elevation)

  • Difference between Normal Table and Tilt up Table

    General Details about table:

    • Tables are used for fabrication of precast panels in factories or yards with good quality, finish, curing and low time consumption.
    • Different types of materials used for tables like timber, aluminum and steel. But steel is mainly used for tables because it’s good for repetitions, gives good vibration to concrete, it’s not easily damaged and tables do not expand when it’s wet, etc.
    • The cleaning process is also easily done for steel tables with the help of air blowing or cotton waste.
    • In the yard there are different types of tables used for fabrication.
      For example normal fabrication tables and tilt up tables.

    Normal table:

    • Normal tables are mainly used to fabricate most of the precast panels.
      (Refer Fig 1)

    Fig 1

    • Advantages:
    • Normal tables will not take more manpower for cleaning and fabrication of precast panels.
    • The maintenance is easy
    • The cost is low when compared to other types of table.
    • It can easily fix where we need to fabricate the panels.
    • It will be fixed on the floor, so the visibility of the table is good for all.
    • Disadvantages:
    • It’s not suitable for doors or big opening panels. Because in case of lifting panels it may break.
    • Normal table needs additional lifting support.

    Tilt up table:

    • The tilt up tables are mainly used for Doors and big opening panels and also other types of panels. (Refer Fig 2 & 3)
    • The tilting process allows the precast concrete element to be removed safely and without damaging it.
    • The titling tables are designed in particular for mobile use and can be quickly transported from the yard.
      Fig 2


      Fig 3

    • Advantages:
    • This table is good for fabricating and lifting the door, opening type of panels.
    • Hydraulic Tilt up Tables reduce manufacturing time because it’s not require more pouring time to lift the panel from table.
    • Vibration technology based operation ensures qualitative compaction of concrete and a consistency in quality.
    • It’s very high level of concrete compacting with low noise.
    • Minimal costs when transporting the tilt up table.
    • Disadvantages:
    • Manpower is necessary and also needs knowledgeable people for handling.
    • The maintenance is difficult
    • The cost is high
    • It’s not movable, so we need to collect materials at a nearby table.

  • Types of Brace (Prop) Plan

    Brace are used for temporarily support precast concrete elements until the permanent fixing are made.
    1. Single storey (Drop-in) panel propping
    2. Double storey (Spin-up) panel propping
    3. Panel higher than double storey propping
    4. Panel to panel propping
    5. Edge Propping
    6. Spandrels propping

    1. Single storey panel propping:
          Single story panel are normally used 2 props a panel. Some times more than 2 props are used based on panel design.

    2. Double storey panel propping:
                    Double story panel are normally 2 props placed 200mm below the underside of slab. Some times more than 2 props are used based on panel design.


    3. Panel higher than double storey panel propping:
           This type of panel needs two level of propping. Two props on the below level and two props on the above level. If there is a slab in above level the propping system will pass through the below level slab by providing a pocket on the slab

    4. Panel to panel propping:
            Provide ferrule in the opposite panel Or Adjacent panel for propping. Especially this kind of propping system are applicable for lift and stair core area, where there will be no slab to support the prop.

    5. Edge Propping:

        These types of propping are used for column and some panel having cantilever. Provide ferrule in the edge of the panel.

    6. Spandrels propping:
            These types of propping are used for spandrels. Provide ferrule at the top of panel. Where the ferrule will be connected with the member which hold the propping system.

    Model brace plan drawing:


  • Checking the Transportability of Precast Panels – Using the AutoCAD .net API

    Checking the Transportability of Panels – Using the AutoCAD .net API

    It is one thing to build a panel. It is another to ensure that:

    1. It can be lifted, and
    2. It can be transported to the site.

    Here is a video demo explaining everything:

    Can a precast panel be safely transported? from Tek1 on Vimeo.

    A short primer on the importance of efficiency

    When you are dealing with 100s, and perhaps even up to a 1000 panels per building, this can become extremely cumbersome and time consuming. Why not automate the entire process? This allows you to do things faster, to get the drawings out faster, and (hopefully) to build the panels faster, and ultimately the building faster. Speed is absolutely paramount! The faster a builder can get on and off of a construction site, the faster they can get paid. This lowers their working capital needs, and accordingly, their financing costs (however that may arise). Speed is king!

    Considerations When Transporting Panels to Site

    Every truck has a:

    • Size limitation (both length and height), as well as a:
    • Weight limitation (there is a maximum capacity).

    Secondly, trucks have different limitations, depending on where they are transporting a panel. E.g.

    • Trucks passing through the CBD (central business district) have different: length/height and mass requirements compared to those that are not, furthermore, these requirements are different depending on whether the truck has a permit or not.

    Let’s suppose you have the following hypothetical situation – take out a sheet of paper and pen and try and solve this by hand:

     

    Truck A

    • Length limitation: 6 m
    • Height limitation: 3 m (but a height limit of 2.5 m in the CBD; and a height limit of 3.2 m with a permit)
    • Weight Limit: 12 tonnes.

     

    Truck B

    • Length limitation: 4 m
    • Height limitation: 4 m (but a height limit of 2.5 m in the CBD; and a height limit of 3.2 m with a permit)
    • Weight Limit: 18 tonnes.

     

    How on earth are you going to work out, quickly and efficiently, whether your fleet can transport the following panels:

    1. ABC1 – Mass: 13 tonnes, Length: 5 m, Height 3 m
    2. ABC2 – Mass: 10 tonnes, Length: 3 m, Height 2 m
    3. ABC3 – Mass: 12 tonnes, Length: 4 m, Height 2.5 m

     

    Problem

    • Are you able to transport your panels by any of the trucks in your fleet?
    • Which of your trucks can you use to safely transport a particular panel?

    How was this particular problem was solved using the AutoCAD .net API?

    • I created a data structure for each of the limitations imposed by a truck.
    • Similarly, I created a data structure for each of the limitations imposed by each panel.
    • And very simply asked whether a truck and lift a panel? The output was compiled and put into an Excel report. They key method tying this all together is the `CanLift` method on the Truck class.
    • I used ClosedXML to combine it all together to produce a report.

    Here is an example of the results:

    panels that failed the transport check
    A sample of the report produced when running the command. This is showing all the panels that failed.

    Here are the key server classes:

    Summary

    • Tek1 has the resources and expertise in order to do Precast Panelling jobs fast and
    • Accurately

    These are just the tip of the ice burg in terms of the checks and processes we employ.

  • Should you cast in a Reckli Groove in a precast concrete panel?

    There are situations where you may prefer to cast in a Reckli groove.

    If the Reckli is contained within one panel, then you must surely cast it in. However, if the flashing groove runs past several panels, it may be better to saw cut the groove at site.