Steel Detailing | Precast Detailing | Estimation

Tag: PRECAST CONCRETE PANEL

  • 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

  • TYPES OF CRANES FOR PRECAST BUILDING CONSTRUCTION

    About Crane:

    Cranes are used for loading and unloading the precast walls on yard or site. Each precast walls or components are usually large and heavy weight, so cranes are required to lift them. And also, cranes are easily done when set the precast position while erecting on site. It will help to reduce manpower and cost of precast wall lifting and also to reduce construction time delay.

    We mainly used two types of cranes on both factory and site.

    1. Tower crane (Ref. Fig 01)
    2. Mobile crane (Ref. Fig 02)

      1. Tower Crane:
    • For precast construction the tower cranes are playing major role to handle precast walls in the yard and also during erection on site.
    • It’s mainly used for multi storied building construction.
    • Tower cranes are inbuilt on site. So, safety, selection, placement, and reliability of tower cranes are very important to completion of Precast buildings on time.
    • It is proven to be safe, long lasting and very fast in construction
    • The big issue is wind acting on the tower crane. The small collision may lead to big accidents or damage the precast elements and also delay in completion of job. So, while fixing the tower crane we need to fix in proper placement to avoid unwanted damages and waste of cost.
    • Tower cranes are fixed on site so it can’t be moved to one place to another.
    • Tower crane is used to multi-levels building’s to lifting the panels from ground floor to needed level. But it has limitations to cover wide area.


    Fig.01

    2. Mobile crane:

    • Mobile cranes can be used to lift, carry, and place materials in many applications.
    • For tilt-up construction jobs can be completed quickly, accurately, and safely.
    • Sometimes mobile cranes are help for tower cranes to rotate and move the precast walls from truck or site.
    • It will also help for loading and unloading the precast walls from the truck.
    • The wind energy will not affect while lifting precast walls when compared to tower cranes.
    • Mobile cranes are movable. So, if we need to move any other places it is easy.
    • And it’s used for mainly single-story building construction.
    • It is compact in size so it’s can’t occupy more place on site.
    • Compare to tower crane we can’t use this crane for multi-levels building. But it’s used to cover the wide range of area on site.

    Fig.02

  • 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)

  • INSULATED PRECAST CONCRETE PANEL

    INSULATED PRECAST CONCRETE PANEL:          

    Insulated precast concrete panels consist of interior and exterior thickness of concrete with the rigid insulation inserted or ‘’sandwiched’’ between the two layers, thus their alternate name of insulated panel is “sandwich panels”.

    LAYERS IN INSULATED PRECAST CONCRETE PANEL:

    • The two layers of concrete thickness, often referred to as concrete wythes and a layer of insulating materials are connected by using one of many wythes connecting systems (connectors).
    • Each layer of concrete thickness contains reinforcement as per structural design.
    • The concrete wythes can vary in thickness depending on structural and architectural requirements of a project.

    METHOD OF MANUFACTURING:

    • The insulated precast panel is manufactured by using two pours (pour-1 and pour-2).
    • Table with reinforcement for pour 1 wythe to be arrange and start to pour concrete (Pour-1).
    • After the first wythe is poured and the pre-cut rigid insulation segments are placed on top of the wet concrete and all insulation connectors are installed.
    • The reinforcement for the interior wythe is then placed and the second wythe is poured. Finally, the interior surface can be trowelled smooth.

    APPLICATION:

    The insulated precast concrete panels are mostly used for the place where the thermal insulations are required. some of the applications are shown in below

    • Cold storage factories.
    • Residential houses.
    • Hospitals.
    • School buildings.
    • Offices.
    • Chemical laboratories.
    • Shops.