Vertical

Lifting

A Total Solution in Heavy Lifting

From Erection Scheme Design to construction, our total solution in Heavy Lifting does not only focus on efficiency, but also places the same amount of attention on safety by design.

Eric Kwok
Technical Director

From Erection Scheme Design to construction, our total solution in Heavy Lifting does not only focus on efficiency, but also places the same amount of attention on safety by design.

Redevelopment of Kwong Wah Hospital, Yau Ma Tei

In place of the original proposal with RC, steel structure was chosen for its superiority in efficiency of span to depth ratio and self-weight ratio. From erection scheme design, fabrication, logistics, to on-site erection, GWSS offered a comprehensive “Heavy Lifting Solution” for this redevelopment project.

The mezzanine steel structure components of Kwong Wah Hospital were pre-fabricated in Goldwave’s fabrication yard in Jiangmen. The components were directly delivered to the construction site by road. While minimizing the impacts on daily operation is a prerequisite, the semi-modularized assembly and erection of the steel structural were carried out in a tight working space next to the Main Building of the Kwong Wah Hospital.

Being one of the busiest districts in Hong Kong, Yau Ma Tei has imposed a real challenge on transportation issues throughout the entire project. In view of the road condition that was persistently plagued by heavy traffic, Temporary Traffic Arrangement was carefully planned.

This project has demonstrated our sophisticated approach in addressing the demanding tasks with quality workmanship applied on high strength S460 steel material and technical know-how in heavy lifting, which minimized the risks of working at height.

Besides, the scope of work comprised the assembly of ancillary steels, staircases and roof steel in the basement and ground floor.

Project Summary

Long Span Steel Truss Structure with Supporting Double-truss
Total Weight: 2,600T
Dimension of Long Span Steel Truss Structure (D x W x H):
47m x 33m x 5m
Capacity of Strand Jacks
6 x 200T + 6 x 100T

Stakeholders

Client

Hospital Authority

Main Contractor

China State Construction International Holdings Limited

Awards

Bronze Medal, Award of Best Method Statement by Occupational Safety & Health Council

Project Types

CHALLENGES

Congested Traffic at Site Location

The heavy traffic in Yau Ma Tei has restricted the transportation frequency, limited logistic flexibility, and created difficulties when scheduling the construction work.

The construction site was attached to the existing Main Building in Kwong Wah Hospital, which was in normal operation and surrounded by residential and historical buildings nearby.

Coupled with the complexity of assembling the massive pre-fabricated steel structure components into one piece, the extremely tight site access and space allowed very limited working area for on-site assembly, erection, and storage.

Complicated Structure (Highly-skilled Welding and Stringent Quality Control)

On-site welding of high strength steel S460 was initially required from ground level. High degree of precision engineering and expertise for on-site welding for steel materials up to 80mm thick was required to meet distortion control for thick steel plates, fitting of components on site, and tight geometry control of the pre-fabricated steel trusses.

The integration of tolerance control for large cast-in pieces with reinforced concrete structure endured a series of analytical process engineering.

Other than welding on ground, individual connection matched and fitted to install each 70-ton double truss through on-site welding at height (6-degree of fine-tuning adjustment of the overall geometry) posed another huge challenge.

Heavy Lifting of the 1100T

In order to complete the permanent steel structure, the ultimate deliverable was to lift up the1100T mega one-piece truss structure by 20M from ground and to prepare for match up with the double trusses. Welding at height with in-filled pieces thus required extra attention on safety measures.

SOLUTIONS

Just-in-Time Logistics of Pre-Fabricated Components

Led by a team of professionals with international exposure in mega structure heavy lifting, our technical know-how and project management expertise facilitated the work in each stage.

Meticulous planning determined the most effective and precise construction sequence. Modeling / simulation of the work in each stage were conducted before project commencement.

With the support of our self-owned fabrication yard in Jiangmen, we were able to pre-fabricate the required steel structure components and transported them to the site at Kwong Wah Hospital directly. To facilitate the temporary traffic management, night delivery was scheduled.

Seamless Combination of Workmanship and Automation in a Substantial 2-Part Welding

Stage engineered methodology was applied from design to build, with particular attention paid on safety. To minimize the chance of working at height, welding of high strength steel S460 thick plate steel was carried out smoothly by our specially-designed robotic arm on ground. The massive one-piece horizontal steel truss platform was assembled and ready to be lifted up.

In-depth planning for in-fill pieces helped minimize the possibility of potential mismatch. Thanks to the matching through highly precise connection, the semi-modularized pre-fabricated double trusses from Jiangmen were installed on site, via a 6-degree fine-tuning adjustment for geometry control. In order to complete the project, the double trusses were to be welded permanently with the 1100T massive steel structure.

Strand jacks were applied as temporary support to lift up the massive steel structure from ground. A highly skilled welding team was pulled in to perform the welding at height. In particular, the experienced pre-heating skills and welding of thick steel plates in proper sequence ensured high quality workmanship.

High Level Quality Assurance

Diligent engineering checks, verification, and stage analysis including coordination of temporary works ensured that each step of the erection was safe and sound.

KEY DELIVERABLES

Innovative Construction Technology

Construction Efficiency and Quality of Work

Reduced Completion Time by a Few Months

Reduced Risk of Working at Height

TEAM SHARING

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