những vấn đề cơ bản về xây dựng tầng ngầm (Basement Construction)

Xây dựng Tầng hầm sâu và quy mô lớn các cấu trúc ngầm.Ví dụ về các cấu trúc dưới lòng đất. Tầng hầm của các tòa nhà. Bán Tầng hầm với mục đích ổn định độ dốc.

Basement Construction

Part Ï —

General understanding about the Construction of Basement

Construction of Deep Basement and

Large-sized Underground Structures

Examples of underground structures

Construction of Deep Basement and

Large-sized Underground Structures

Involvement/provision when constructing these

Structures

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Methods for basement construction

Basement or similar underground structures can be constructed using the following approaches:

- suitable for site with abandon of unobstructed working space

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- suitable for basement of small to medium size

Construction of basement using Bottom-up

suitable for basement of very large size with complex environment

Construction of basement using Top-down approach

LEE GARDENS

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Compare the features of various

basement construction methods

Protection Simplest protection |Complex lateral Limited shoring

Support required — |support where req’d

Other consideration

Attributes that affect the construction of deep

basement:

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Basement Project in very congested urban environment — the Redevelopment of Kwong On Bank in Queen’s Road Central,

Central District, Hong Kong

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Examples of very difficult

environment for

constructing basement

Complicated soil support arrangement

Special performance requirements imposed

Complete the whole or part of the work at a prescribed time or at Stages for handing back to the client

Protect some facilities according to prescribed requirements during

the course of work

Coordinate with some other contracts or contractors to have related

works carried out in the same or In close proximity of site

The nature of work required exceptionally high quality or accuracy in performance

Very high liquidated damages requirements is imposed in the

confract

where a new basement is required to construct

simultaneously to replace an old one

working under fast-track schedule,

some basement works need to be carried out at the same time with the new foundation or even with part of the future superstructure

Complicated phasing arrangement in _ constructing the basement of Lee Garden

Complicated Construction arrangement — demolition of the old basement, construction of the future building cap and core, erection of the new ground slab as top-down for the basement, working at the

same time

The Lee Garden Redevelopment case

Cheung Kong Center — foundation and core wall work at the same time with the top-down basemetn

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The Center - Foundation and Basement construction arrangement

Common managerial problems identified in the

construction of deep basement:

There are many methods to construct large- scaled and deep basement

Redevelopment of

the Lee Theatre

Construction of basement using

traditional bottom-up

arrangement

Church for the Witness of the Christ Project

Example of very large-scale and complicated project — the Hang Hau Station of the MTR Tseung Kwan O Line

Example of very large-scale project — the Kowloon Station of the Airport Railway

Other considerations when doing basement works

Commonality found in recent basement projects

An extremely large-scale and complex project —

Construction of the International Finance Centre Phase II

(Top-down for the podium portion and bottom up for the building core portion)

Examples of very complicated phasing arrangement during the basement construcfion

Commonality found in recent basement projects (Cont.)

Special arrangement for the removal of spoil to facilitate basement excavation

Commonality found in recent basement projects (Cont.)

Basement construction using “Double Bit” arrangement — 1.e construct two levels of basement and fill in the

intermediate level at a later stage

The construction of basement bears a very spectacular Status in the entire construction process It often marks

the success of a project in terms of:

- profitability,

- ensurance of contract time,

- quality and safety considerations

Various professions would have their own involvement in the basement construction process and each of them has their own concerns It is not easy to formulate a simple yet Straight forward solution to get everything right

Better understanding of the variety of possible methods and practices, as well as knowing the constraints when handling basement works, there is higher chance to complete the work with a more acceptable result - >

Conclusion (Cont.)

Redevelopment of the URC’s site at Mong Kok — using top-down and bottom-up mixed method

Land Renewal Council’s site at Mong Kong — the input of large

amount of resources (mechanical plants) may not help much in very complicated basement project)

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