Condition Survey Report of Lei Uk Village€¦ · Condition Survey Report of Lei Uk Village July...

Annex A2

Condition Survey Report of

Lei Uk Village

Sha Lo Tung Study Condition Survey Report of Lei Uk Village Black

Rev 2

Sha Lo Tung Study Condition Survey Report of Lei Uk Village

July 2009

This report takes into account the

particular instructions and requirements

of our client.

It is not intended for and should not be

relied upon by any third party and no

responsibility is undertaken to any third

party

Ove Arup & Partners Hong Kong Ltd

Level 5, Festival Walk, 80 Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong Tel +852 2528 3031 Fax +852 2268 3949

Sha Lo Tung StudyCondition Survey of Lei Uk Village

C:\DOCUMENTS AND SETTINGS\ELROY.WONG\DESKTOP\LEI UK REPORT_REV2.DOC

Page 1 Ove Arup & Partners Hong Kong LtdRev 2 2 September 2009

Contents

Page

1 Introduction 1

2 Observation of Wall Conditions 1

3 Recommendations and Conclusion 20

Appendices

Appendix A

Fencing Details


C:\...\DESKTOP\LEI UK REPORT_REV2.DOC Page 1 Ove Arup & Partners Hong Kong LtdRev 2 2 September 2009

Masonry Wall

Collapsed Wall

N

Partially Collapsed Wall or Free Standing Wall

Partition Wall

1 Introduction

A condition survey has been carried out by Arup to the 14 masonry buildings at Lei Uk

village of Sha Lo Tung on 20 May, 27 May, and 4 June 2009. These houses seemed to be

unoccupied for a period of time and have been suffering from different level of deterioration

on external brick walls. The 14 houses are linked and aligned in North-South direction as

shown in Figure 1. Most of the front (West) and rear (East) walls are perforated by doors

and windows. The narrative of individual house is described in Section 2 of this report.

Figure 1 Site Layout Plan

2 Observation of Wall Conditions

House 1

The two storey village house is constructed with 300mm thick masonry brick wall.

The house contains 2 units separated by an internal partition wall. The floor and roof system

of the north unit are of timber joists and board and they appear to be in reasonable condition

(Figure 1).

South wall adjoining house 2 is completely collapsed (Figure 2). The masonry wall is

collapsed as a result of collapsed roof connected to the south wall. There is no access to

N



the rear side of the house as the interior area is completed covered by vegetation, the

condition of east wall cannot be inspected. The west wall which spans between the partition

wall and the south wall is free standing and should consider demolishing to ground or to be

isolated from public access (Figure 3).

The structural frame is in reasonable shape and do not appear to be at risk of collapse at

the time of inspection.

Figure 1 - Timber Floor System of House 1

Figure 2 - Collapsed South Wall and Adjoining Roof

1/F of timber joists and board



Masonry Wall

Collapsed Wall

N


Figure 3 - West Elevation of House 1

House 2

The single storey village house is constructed with 300mm thick masonry brick walls.

The entire timber roof, along with south wall and north wall adjoining house 3 and house 1

respectively are completely collapsed (Figure 4&5). There is no access to the rear side of

the house as the interior area is completely covered by vegetation, the condition of east wall

cannot be inspected.

Remains of the 300mm thick west wall (Figure 6) is partially collapsed and should consider

demolishing to ground or isolated from public access.

Figure 4 - Collapsed North Wall

Free Standing Wall

Completed Wall at Full Height



Masonry Wall

Collapsed Wall

N

Partially Collapsed or Free Standing Wall

Figure 5 - Collapsed South Wall

Figure 6 – West Elevation of House 2 (~4.2m high)

House 3



are completely collapsed. There is no access to the rear side of the house as the interior

area is completely covered by vegetation, the condition of east wall cannot be inspected.

Top portion of the 300mm thick west wall (Figure 7) is partially collapsed and should

consider demolishing to ground or to be isolated from public access.



Masonry Wall

Collapsed Wall

N



House 4



respectively are completely collapsed (Figure 8&9). There is no access to the east wall as

the interior area of the house is completely covered by vegetation.

There is no lateral support for west wall (Figure 10) and the brickwall should consider

demolishing to ground or isolated from public access.

Figure 8 - Collapsed South Wall



Masonry Wall

Collapsed Wall

N


Figure 9 - Collapsed North Wall


House 5

The single storey village house with constructed with 300mm thick masonry brick walls.

The entire roof and north wall adjoining house 4 are completed collapsed. South wall

adjoining house 6 is in reasonable shape at time of inspection. East wall is inaccessible as

the interior area of the house is covered by vegetation.

Due to the collapse of north wall, remains of the west wall (Figure 11) should consider

demolishing to ground or to be isolated from public access as it is laterally unsupported.



Masonry Wall

Collapsed Wall

N



House 6


North wall adjoining house 5 is partially covered by vegetation. The timber roof along with

the top portion of north wall appears to be partially collapsed (Figure 12). South wall is

independent from the north wall of house 7 and the condition is fair at the time of inspection

(Figure 13).

The single storey house contains all the external walls and does not appear in unstable

condition at the time of inspection (Figure 14).

Figure 12 - North Elevation of House 6



Masonry Wall

Collapsed Wall

N

Partially collapsed Wall or Free Standing Wall

Figure 13 – South Elevation of House 6


House 7

The single storey village house is constructed of 300mm thick masonry brick walls.

North wall is independent from south wall of house 6 and it is in reasonable shape at the

time of inspection (Figure 15). South wall adjoining house 8 also appears to be in good

shape (Figure 16). East wall is restrained by north/south wall and it is in fair condition

(Figure 17).

Timber roof is partially collapsed (Figure 18).

The house contains all external walls and it does not appear to be at risk of collapse at the

time of inspection (Figure 19).



Figure 15 - North Elevation of House 7

Figure 16 - East Elevation of House 7

Figure 17 - South Elevation of House 7



Masonry Wall

Collapsed Wall

N


Figure 18 – Partially Collapsed Roof


House 8

The single storey village house is constructed with of 300mm thick masonry brick walls.

The masonry brickwalls adjoining house 7 and house 9 are found in acceptable condition

(Figure 20 & 21), the walls are subjected to limited extent of exposure as the timber roof is

generally in shape at the time of inspection. Timber joist on pitch roof is noted with local

defect as the member is buckled (Figure 22). There is a risk of further deterioration causing

collapse of roof structure.



The house contains all external walls (Figure 23) and does not appear to be at risk of

collapse but the deterioration of roof condition might consequently affect the stability of wall.

Figure 20 – North Elevation of House 8


Figure 22 – Buckled Timber Joist on Roof

Timber joist



Masonry Wall

Collapsed Wall

N



House 9

The single storey village house is constructed of 360mm thick masonry brick wall.

South wall adjoining house 10 and north wall adjoining house 8 are in reasonable shape at

the time of inspection. Major deformation is evident on the partially collapsed west wall.

Above the door opening, fracture and wide cracks are found on the east masonry wall

(Figure 24). East wall is inaccessible as the interior area of the house is completely covered

by vegetation.

Timber roof is completed collapsed.

Remains of the 360mm thick west wall is vulnerable to collapse and should consider

demolishing to ground or to be isolated from public access.



Masonry Wall

Collapsed Wall

N


Figure 24 – West Elevation of House 9 (~3m high)

House 10


Timber roof is completed collapsed (Figure 25) and most of the internal structures are

exposed to weather. It is evident that top portion of the south wall is partially collapsed

(Figure 26) while the north wall exhibits no sign of significant deterioration (Figure 27). West

wall is laterally restrained by south wall and north wall and it appears to be in reasonable

shape (Figure 28). East wall is inaccessible as the interior area is covered by vegetation.

The house contains all external walls and does not appear to be in unstable condition at the

time of inspection.

Figure 25 - Collapsed Roof of House 10





Figure 28 – West Elevation of House 10



Masonry Wall

Collapsed Wall

N

Partially Collapsed wall or Free Standing Wall

Vacant Land

Masonry Wall

Collapsed Wall

N


House 11

No access to the close up examination due to vegetation and the masonry wall appear to be

completely collapsed (Figure 29).

Figure 29 – Vacant land

House 12


North wall adjoining house 11 is in stable condition at the time of inspection (Figure 30).

South approaching to the east end is evident of partial collapse (Figure 31). West wall is

laterally restrained by north wall and south wall and it appears to be in reasonable shape

(Figure 32). East wall is also laterally restrained by south wall and north wall and shows no

sign of significant deterioration (Figure 33).

Timber roof is completely collapsed (Figure 34).

The house contains all external walls and does not appear to be at risk of collapse at the

time of inspection.




Figure 31 – Partially Collapsed South Wall near East End




Masonry Wall

Collapsed Wall

N


Figure 33 – East Elevation of House 12

Figure 34 – Collapsed Roof of House 12

House 13


North wall adjoining house 12 (Figure 35) and south wall adjoining house 14 (Figure 36) are

in reasonable shape, east wall is partially covered by vegetation but there is no sign of

significant deterioration at the time of inspection (Figure 37). Thorough inspection on west

wall is difficult as it is partially covered by vegetation. The masonry wall seems to be in

stable condition and it is laterally restrained by south wall and north wall (Figure 38).

Timber roof is completely collapsed.



The house contains all elevations and it does not appear to be at risk of collapse at the time

of inspection.


Figure 36 - South Elevation of House 13

Figure 37 - East Elevation of House 13



Masonry Wall

Collapsed Wall

N



House 14


North wall adjoining house 13 is restricted to access due to vegetation. South wall is in

stable condition at the time of inspection. West wall is laterally restrained by south wall and

north wall and it appears to be in stable condition (Figure 39).

Roof structures cannot be inspected as the growth of vegetation limits the access to the

interior area of the house.

The house contains all elevations and does not appear to be at risk of collapse at the time of

inspection.




3 Recommendations and Conclusion

(i) The following masonry walls are considered partially collapsed and some of them are

missing the top portion:

- Part of west wall of house 1

- West wall of house 2, 3, 4 & 5

- West wall of house 9

These walls should be isolated from the public access from the structural point of view.

(ii) We understand the masonry walls which are considered in reasonable shape at the time

of inspection may further deteriorate due to lack of maintenance. In view of public safety,

we would advise:

- The provision of fencing of clear distance between the fencing and front elevation of the

buildings shall not be less than 1.5m to prevent the structures from public access.

-The boundary fence shall be constructed in form of chain-link fence with barbed wire and

entrance gate to allow single point access. It is not intended to withstand loadings from

the collapsed walls.

- The remote site could result in limited access for construction equipment and materials

transportation. To overcome these constraints, the safety fence shall be constructed of

acceptable materials and techniques in accordance with applicable standard and

specification.

- Fencing height shall not be less than 1.8m. Guidance of the design is shown in Appendix

A – Fencing Details.

- The boundary fence shall be compatible with the existing masonry buildings and the

adjacent footpath to surround the site. With the exclusion along the east elevation which is

bounded by natural slope features, fencing shall be constructed along the full length of the

site boundary (Figure 40).



Figure 40 Chain-Link Fence Layout Plan

N

Appendix A

Fencing Details

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