Category: Precast Blogs

Tek1 has detailed over 100,000 precast panels over 19 years.
over 90,000 were detailed under a proxy name Advanced Pretty Pictures Pty Ltd

PRECAST PANEL DETIAILING
EXPERT PRECAST PANEL DETIAILING

  • Setting Precast Covers

    Pick up UDA covers in Drawing Template

    For precast panels set Covers in Local to pick up in template

  • Industrial Units Drafting

    Industrial Units Drafting

    Trimble Connect Model

    Shop drawings Precast panels and structural Steel

    This is an example where we have model shared with client for completing the precast panels and structural steel.

    Clients save time and in turn money when both precast and structural steel is detailed in one single model. Co Ordination is easier.

    With nearly 19 years of experience detailing structural steel and precast panels, Tek1 has the expertise to deal with any type of precast strucutures in Australia

    (more…)

    Shop drawings Precast panels and structural Steel

    This is an example where we have model shared with client for completing the precast panels and structural steel.

    Clients save time and in turn money when both precast and structural steel is detailed in one single model. Co Ordination is easier.

    With nearly 19 years of experience detailing structural steel and precast panels, Tek1 has the expertise to deal with any type of precast strucutures in Australia

    (more…)

    Shop drawings Precast panels and structural Steel

    This is an example where we have model shared with client for completing the precast panels and structural steel.

    Clients save time and in turn money when both precast and structural steel is detailed in one single model. Co Ordination is easier.

    With nearly 19 years of experience detailing structural steel and precast panels, Tek1 has the expertise to deal with any type of precast strucutures in Australia

    (more…)
  • Abernant Warehouse

    Abernant Warehouse

    Trimble Connect Model

    Shop drawings for Warehouses

    When there is precast panels and structural steel to be detailed, why go approach two separate detailers. Keeping everying in one model saves money and time. Tek1 has been detailing structural steel and precast panels for 20 years now. With large expert team, no job is difficult for us

    #Precast Panel #Precast Panel Shop Drawings #Steel Detaling #WareHouse #Commercial

    (more…)

    Shop drawings for Warehouses

    When there is precast panels and structural steel to be detailed, why go approach two separate detailers. Keeping everying in one model saves money and time. Tek1 has been detailing structural steel and precast panels for 20 years now. With large expert team, no job is difficult for us

    #Precast Panel #Precast Panel Shop Drawings #Steel Detaling #WareHouse #Commercial

    (more…)

    Shop drawings for Warehouses

    When there is precast panels and structural steel to be detailed, why go approach two separate detailers. Keeping everying in one model saves money and time. Tek1 has been detailing structural steel and precast panels for 20 years now. With large expert team, no job is difficult for us

    #Precast Panel #Precast Panel Shop Drawings #Steel Detaling #WareHouse #Commercial

    (more…)

  • Overall Bending Dimensions for 180 degree and 90 degree cogs and Hooks for rebars used in Precast Panels

    Overall Bending Dimensions for 180 degree and 90 degree cogs and Hooks for rebars used in Precast Panels

  • Importance of Gap between Slab Edge and Panel Face

    It is important to leave a small gap between precast panel face and slab edge to avoid unnecessary stresses on the panel and the slab.

    Keeping the slab edge incontact with the panel causes thermal expansion stresses both on the slab and Cocnrete.

    To avoid crack in the slab, it is recommended to introduce an artificial crack about 1 meter from the panel

    Importance of gap between Panel and Slab to avoid un necessary stresses in precast

  • Minimum Recomendeds Sizes for Precast Panels

    Given below si minimum recommended sizes for Precast Panel legs and spandrels. However if the sizes are smaller the detailer will have query with the engineer.

    Minimum recommended leg width – 600 mm

    Minimum Spanders depth 900 mm

    They also depend on what is the length.

    Minimum sizes for precast legs and Spandres Panels

  • Panel To Rafter Connections

    Bad connections can cause precast to crack.

    Here is and example of a bad precast connection.

    Avoid connections which Tie Precast panels rigidly not giving any room for shrinkage expansion

    Bad Rafter to Precast Panel Connections
    Good Rafter to Precast Panel Connection

  • Load Bearing & Non-load bearing concepts in precast

    What is load bearing precast element?

    Load bearing precast element is anything that receives load from a precast or structural members and transfers the load to another structural member or precast. These precast elements can also be used along as façade, boundary walls, or for architectural design purposes.

    What is non-load bearing precast element?

    Non-load bearing precast element is anything that may receive load but must not transfer loads to any other structural members or precast. Normally these kind of walls are used only for partition, façade, boundary walls, or for architectural design purposes

    What is Partially-load bearing precast element?

    Partially-load bearing precast element is anything that receives load from a precast or structural members and transfers the load to another structural member or precast. But only a portion of precast receives and transfers load and the remaining portions will act as non-load bearing ones. (Single precast element which acts both as load bearing & non-load bearing)

    Data’s, panel types  & other details for

    Load-bearing element  Non-bearing element  Partially-load bearing element
    Grade, can be higher upto 80MPaGrade enough be 40MPa (UNO)Grade, can be higher up to 80MPa
    Gap between two elements are filled with grouting material of required gradeGap between two elements are filled with Soft joint caulking only. no grouting.Gap between two elements are filled with grouting material of required grade, extent of filling is for load bearing portion. Remaining portion will be soft joint caulking only
    Dowels to be black finish (UNO)Dowels to be Galvanized finishDowels to be Black or Galvanized finish, as per load bearing extend (UNO)
    Dowel length, size & spacing as per Engineer’s requirementDowel length, size & spacing as minimum as possible after discussing with Manufacturer or EngineerDowel length, size & spacing as per Engineer’s requirement  for LBP portion Dowel length, size & spacing as minimum as possible for NLBP portion
    Dowel & Grouting materials will transfer load to adjoining elementDowel will be used to position the precast element & no grouting material present to transfer load. So loads will not be transferred.Combination of LB & NLB criteria
    No ring seal around the dowelHigh density foam ring seal around the dowelNo ring seal around the black dowel High density foam ring seal around the Galvanized dowel
    Grouting material will cover the dowel, so oxidation in dowel is negligibleNo Grouting material, oxidation in dowel is possible. So high density foam ring seal is used and dowels are galvanized to prevent oxidation in dowelCombination of LB & NLB criteria
    No additional tubes or caps neededPlastic tube will be placed over upper half of dowel. Compressible cap will be placed over the top of the dowel bar.Combination of LB & NLB criteria
    Connection with slab mustConnection with slab may not needed with respect to engineer requirementCombination of LB & NLB criteria

  • Precast Propping

    This is an image showing how precast panels are propped

    Propping parameters

    Usually propped at 2/3rd height.

    No of props usually 2

    if the panels are wide could go to more than 2. But rarely 4.

    For Panels which span 2 floors, There could be 4 props. 2 below the floor above and 2 above. When you have such a case you have to show opening on the slab through which the upper props will pass.

    How long will the props stay in place.

    Usually between 1 to 2 months. It could be longer if the construction pace is slow.

    How many props are usually used in a multi storied construction?

    Depends on construction speed number of panels.

    But the number could be around 200.

    With prop hire rate of around $3 per week, you can see that the cost of propping is not very small.
    When you are estimating for precast, it may be good to consider how many props will be used and what would the cost of propping for a project

    Propping is highly skilled job. Improper prop installation can cause accidents shutting down sites, sending stake holders broke. Not to speak of the harm it does to the site personnel.

    Who designs the prop.

    Most of the the time props are drafted by the detailer and submitted for approval to the engineer.

    Detailer cannot issue panel or propping drawings unless there is an approval from the engineer. The certification from the engineer is a must. Without that shop drawings cannot go for construciton.

    Without certification, the propping is no go good, illegal and not fit for purpose.

    Insurance companies will not cover if there any issue because of prop failure if the drawings were not certified by a qualified engineer.