Steel Detailing | Precast Detailing | Estimation

Author: Dhileepan

  • Mosnam Metro – Renovation

    Mosnam Metro – Renovation

    Author: Pon Dhileepan

    A set of buildings in Mosman NSW are renovated. The front walls, some windows, doors & a roof are retained to maintain the heritage. The entire interior, GF & FF slabs, some roofs, internal walls etc are made new.

    Existing Structure – Buildings Inside Red Polygon

    Temporary steel frames are used to support the walls to be retained. These remains intact throughout the demolition process until new steel & concrete take their place.

    Not all the internal structure are entirely demolished or all the temporary structures are entirely erected in a stretch. A clear understanding of the sequence of demolition and erection of temporary structure work is vital. Connections given by the structural engineer some times hinder the erection process. It is the duty of the steel detailer to propose new connections accordingly.

    Walls to be Retained
    Temporary Steel Frames to Support the Walls

    New GF concrete slab is laid. New steel columns are added at the GF level to support the FF slab. Steel headers are added to exiting openings that lost support. New concrete walls cover the back & a side of the building. Roof steel rafters are supported between the existing front walls and the new back walls.

    A few retained floor joists are stiffened using additional purlins.

    New Building After Renovation
    New Building Without Roof
    Newly Added Structural Elements
  • 7, Callen Street

    7, Callen Street

    Author: Pon Dhileepan

    This single storey residential house of dwelling area 294m2 is built in Seymour, Victoria.

    This building is neither entirely load bearing structure nor framed structure. It is a composite structure. The roof purlins & beams are supported by steel columns at some area and by block walls at other area.

    The initial design lacked coordination between the structural engineer and the architect. We had raised about 44 RFIs to them. The response delayed the project but the RFIs raised by Tek1 saved a lot of reworks and money at the site.

    ISOMETRIC VIEW
    ISOMETRIC VIEW – STEEL ONLY
  • Skid

    Skid

    Author: Pon Dhileepan

    This is machinery skid made of steel. The main frame made of UB200*18 holds an Alfa Laval Filter (ALF) and a pump. A pedestal out of 75*6EA is bolted to the UB200*18 frame for a strainer. 600mm wide walkway made of chequered plates are placed on top to access the mechanical units. Holes are pre drilled in the steel frame to match the size & location of the mechanical units.

    Steel Skid Frame with Walkway Chequered Plate
    Steel Skid with Mechanical Units
  • Sliding Gate

    Sliding Gate

    Author: Pon Dhileepan

    This sliding gate is modelled to match the existing balustrade (Drawn in red colour). A steel frame covered with aluminium cladding is guided by rollers at the bottom and the rollers attached in the posts.

    Gate Front View
    Gate Back View
    Guiding Rollers attached to Posts
  • M Square

    M Square

    Author: Pon Dhileepan

    This is a commercial development with the combination of precast panels & steels.

    ISOMETRIC VIEW
    ISOMETRIC VIEW – STEEL ONLY
  • VSBA School – Building 21

    VSBA School – Building 21

    Author: Pon Dhileepan

    This is a double storey school building. This building with same dimension and design are used at 4 different locations.

    Full Isometric View
    Isometric View – Steel Only
    Grid and GF Slab Plan

  • Bathers Bay – New Castle Beach

    Bathers Bay – New Castle Beach

    Author: Pon Dhileepan

    Both precast concrete and steel drawings in this project are supplied by TEK1. The outer face of precast concrete has irregular pyramid shape.

    FULL ISOMETRIC VIEW
    ISOMETRIC VIEW WITHOUT ROOF SHEET
    ISOMETRIC VIEW – ONLY STEEL

  • Diamond Creek Netball Pavilion

    Diamond Creek Netball Pavilion

    Author: Pon Dhileepan

    This Diamond Creek Netball Pavilion is a building in Victoria. The pavilion is built next to 8 netball courts. Diamond Creek Netball Association owns this.

    Building Summary:

    The total built up area – 1088 sq.m
    Total steel weight – 40 ton.


    The ground floor of this building is reserved for parking. The first floor has dressing room, 2 change rooms, kitchen , 2 amenities, umpire room, a large multipurpose room etc. The main building in the first is surrounded by corridor from where support could watch the sport. It has a stair and a ramp to access the first floor. The roof is large and is inclined diagonally.

    One special thing about the design is the ramp and first floor slabs are concrete but are laid between perimeter steel members. Refer below image.

    Supply and Schedule:

    This project was undertaken by us during April & May 2020 which was global lockdown period. The project was bit urgent from the client side. After all RFIs, approval submissions, comment implementations, the full pack was submitted by mid of May 2020. We completed it by the desired date even with lesser man power available during lockdown. The project was submitted part by part as requested by the client.


    First supply – Pack for Ramp steel and fence steel
    Second supply – Pack for Stair steel, first floor cast in PFCs and balustrades.
    Third supply – Pack for columns, lintels and roof members.


    A proper coordination between site and detailing team was required as works were undergoing simultaneously. When ramp steel was supplied and they laid concrete, we had to submit the first floor cast in PFCs, cast in plates and balustrades and these must be fabricated before the ramp concrete in done curing. We maintained the schedule properly and no delay happened in the site.

    Some of the model snaps are given below.

    Thanks for reading.

  • Bolt to be used in Glazing location

    Bolt to be used in Glazing location

    Author: Pon Dhileepan

    While working in a project called Bateman Bay, TEK1 came across a situation where PFC members are provided to support glazing. PFCs are laid flat, a 50mm U channel is run along the PFC which supports the glass. The below image is the cross section across the glazing and it elucidate the set up.

    This image has an empty alt attribute; its file name is image-1.png

    Problem 1:

    These PFCs are connected to columns by 10mm end plate & 16dia 8.8s bolts. The problem arose here as the bolt head of 8.8s bolt would clash with the glass. Refer below image for clarity.

    Hence, TEK1 raised a query as to whether they can cut the glass where ever bolts clash or use CSK bolts. The structural engineer changed the 8.8s bolts to CSK bolts.

    Problem 2:

    Another problem came as the PFC web is just 4mm whereas the CSK head is 8mm. The bolt head will still clashes with glass.

    Then we proposed to weld an 8mm plate under the PFC and CSK drill is to be made together. The proposal is accepted. The below images show that the glazing runs without any hinderance.

    TEK1 detected the issue earlier which saved cost in cutting the glass at site. Structural engineer often do not consider these kind of clashes and it is the duty of the modeler to find this out and make this to structural engineer’s knowledge.

    Thanks for reading.