Bespoke
Steel
Structure

A Better Total Solution in Steel Structure

Victor Li
Project Director

“As a team, what matters is how the team members function as a unit, not about individual’s capability.”
- Bill Belichick

We strongly believe when there’s a will, there’s a way – for there are always more solutions than difficulties.

H Zentre, Middle Road

Located at the prime location in Tsim Sha Tsui, H-Zentre is a single commercial complex developed by Henderson Land Development. Formerly a multi-storey car park, it was transformed into a 20-storey Ginza-style complex where dining, clinic, beauty & wellness and retail trade mixes were bundled.

Entrusted by the client, Goldwave delivered a faster, safer, and highly efficient structural steel solution that spanned from structural design, fabrication, to on-site erection, as opposed to conventional concrete construction.

The superstructure was designed as an 85.5M tall building measured from ground floor to main roof with 3 basement floors, in which the lowest level was 14.6M below ground.

Project Summary

Building Height
100m
Steel Structure Tonnage
7,050T
GFA
42,000sqm

Stakeholders

Project Owner

Henderson Land Development Company Limited

Architect

Wong & Ouyang (HK) Ltd

Civil & Structure Engineer

Ove Arup & Partners HK Ltd.

Main Contractor

Hong Kong Construction (General Builders) Ltd.

Awards

HKGBC BEAM Plus for New Building V1.2 – Provisional Platinum Rating

International Property Awards 2018-2019 – Best Mixed-Use Development HK 5 Star Winner

Project Types

CHALLENGES

Complicated Structural Design

H-Zentre was divided into 3 multi-functional zones: 11 levels of retail and dining, medical centres, and 7 floors of car parks. From the 8/F to main roof and transfer room floor, complicated multi-storey composite structure and large span pre-fabricated modularized Transfer Truss Structure were purposefully designed to support load transfer. Large span cantilever structure was incorporated with curtain wall installation. Hence, the overall building structure was much more complicated than traditional commercial buildings.

To maximize the floor area of car parks below the 8/F where car parks and retail area were attached, there was a large difference in levels between the two areas. Hence, the E&M design and the access across the difference in levels between the car parks and retail shops posed a huge challenge throughout planning and construction stages.

Main beams were re-designed to optimize large column spacing (some column spacing were larger than 16M). However, since the limited headroom remained unchanged, the general beam depth in car park area was restricted to 475mm.

Curvy-shaped car ramps were composed by beams, in which high quality workmanship was required to shape the curvature during fabrication and site work installation.

Several floors above 8/F were reserved for restaurants and medical centres that demanded more complex E&M and drainage design. Subsequently, a significant number of penetrations were required in various locations to allow necessary routing of services to pass through reinforced concrete and also steel members. During the design stage, significant number of beams were carefully planned and analyzed for placing openings cater for service pipelines underneath were carefully planned and analyzed that the E&M Zone was merged with the structural zone to save space forin order to cater for the installation of medical equipment. Our dedicated on-site construction sequence facilitated the overall program of all trade mixes.

Bolt and nut connection scheme was designed to increase installation efficiency for the secondary beams to connect to the main beams.

Sophisticated Fabrication and Precise Quality Control

Besides the skillful welding technique, experience off-site/ onsite, and rigid quality control, the structural steel components such as irregular shape of crank beams, 3D curved beams for car ramp, self-fabricated cellular beams (hyper beams), built-up CFT (Concrete Filled Tube) columns and semi-modularized load transfer truss were made by 80mm thick high strength steel plates to maximize the length of span while minimizing the weight of the building structure.

Congested Traffic in the Site Location and Limited Site Space

Surrounded by tourist spots, commercial buildings, and cultural landmarks, single-way road access and congested traffic to construction site imposed significant challenges to material transportation, erection sequence, and storage of steel structure components. Due to geographical constraints, loading and unloading of materials were restricted to 2 trucks per day.

Tight Completion Timeline

From submission to Building Authority, completion of foundation work, to the completion of structural steelworks, the construction program was scheduled to be completed in less than 3 years after the contract was awarded.

SOLUTIONS

Technically Driven and Innovative Structural Steel Design

With the aid of 3D BIM modeling, our innovative design was visualized and shared with all stakeholders throughout the different stages of the project, namely conception, design, construction sequence planning, downstream for use in material take-off, fabrication, quality assurance/control, and construction and facilities management. 80 mm high strength steel plates were selected carefully and fabricated to cater for higher efficiency of the complex structure. For examples, pre-fabricated semi-modularized Transfer Truss structure was designed for load transfer from 8/F to main roof, complex multi-storey composite structure was used to support the floor where the transformer room was located, etc. . Self-fabricated cellular beams, beams with special opening, and hanging structure components were purposefully designed to simplify the arrangement of Building/MEP service and mitigate clash detection within the structural zone. CFT was designed as structural columns to optimize usable carpet area and to meet the multi-functional purposes of the building. Our bolt and nut connection design for secondary to main beam connections greatly contributed to the efficiency of on-site erection while minimizing the time need for working at height. With “safety first” being our top priority since day one of design, we have emphasized the importance on maintaining safety for all stakeholders within the site throughout the logistical arrangements and construction sequences.

Just-in-Time Logistics Plan

In view of congested traffic in the construction site, application of latest Tekla modelling was adopted throughout the entire fabrication process. The methodology, while facilitating efficient material planning / procurement and optimizing the utilization of material during fabrication, also diminished waste and expedited just-in-time delivery of components.

Total Solution

The actual construction program was completed three months earlier than expected. The brilliant achievement relied heavily on the cohesive collaboration among all teams from innovative design, efficient fabrication/logistic management, experienced project management, to skillful on-site erection.

KEY DELIVERABLES

Increase Building Efficiency (Greater Headroom and Usable Area)

More Efficient Construction Program

Mitigate Air Pollution from Concrete Wet Trade

Environmental Friendliness - Reduced Massive Construction Material Debris (Wood Plank)

TIMELINE

JUN 2016

Contract Awarded

AUG 2016

Submission to Building Authority

SEP 2017

Completion of Foundation Work

OCT 2017

Start of Erection of Steel Structure

AUG 2018

Completion of Steel Sub-structure

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