Topic: Site Formation

Transcription

1 Topic: Site Formation Presentation prepared by Raymond Wong January 2010

2 Purpose of site formation is for: Forming of land by cutting & leveling of an uneven, sloppy or congested area. Accommodate building/s or other facilities which will be placed within the area. Form the land to the required orientation, shape or levels in order to accommodate such facilities. Provide the required back-up facilities including access roadways, drainage and other related services, both temporary or permanent in nature.

3 What works are usually involved in site formation projects in Hong Kong Clearance of the site including the removal of buildings or unwanted structures, shrubs and trees, surface soil and debris. Excavation by cutting into slope or other land area to get the required/extra land Leveling of the land by necessary cutting or filling to get a piece of flat or terraced land. Stabilize natural or new slope within the site. Construct retaining wall (as part of the slope stabilization or trimming to terraced land). Forming of access road and drainage system

4 Previous old buildings being demolished Public Road Site level after formation Site level after formation New plantation Public Road Site Boundary New retaining wall Compare existing and new ground profile before and after the site formation

5 Clearance of the site including the removal of buildings or unwanted structures, shrubs and trees, surface soil and debris. - usually done by the use of bulldozer, scraping or other excavating machines Scraping machine so designed with a blade to scrape and level large area of land Bulldozer machine blade

6 Excavation by cutting into slope or other land area to get the required/extra land

7 Leveling of the land by necessary cutting or filling to get a piece of flat or terraced land.

8 Stabilize natural or new slope within the site.

9 Construct retaining wall (as part of the slope stabilization or trimming to terraced land).

10 Forming of access road and drainage system

11 Some site formation project cases as an introduction to start our lecture

12 A site formation project in Ap Lei Chau, Aberdeen, Hong Kong

13 The site as seen in 2008

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15 A residential development project at Ap Lei Chau

16 Choi Wan area in 2000

17 Choi Wan area in 2007

18 Choi Wan area in 2008

19 See also following photos Forming of large piece of terraced land to accommodate new building developments (Choi Wan formation)

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21 New land being formed along New Clear Water Bay Road

22 Terraces (smaller strips of flatter land platform) at various levels were formed at the later stage of formation process

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24 New land being formed near Jordan Valley

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26 Choi Wan area in 2009

27 Another example of large scale formation project - The Anderson Road site formation

28 Area A Anderson area in 2008 Area B Area C

29 Area A at Junction of Clear Water Bay Road and Anderson Road

30 Area B west slope near Shun Lee Estate

31 Shun Lee Estate Area B west slope near Shun Lee Estate

32 Area C north slope nea Sau Mau Ping Estate

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34 The actual view on site

35 The actual view on site

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37 The same location as seen in mid 2011 and mid 2012

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40 The actual view on site

41 The actual view on site from Sau Mau Ping Estate

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43 Start constructing the public estate once after the preliminary completion of the lower part of the site formation.

44 Actual cases of site formation for building works

45 First important work requires for site formation, slope work or to support deep excavation: using of cut-off wall to support the cut Cut off wall can be in several type or form, usually in: Sheet pile wall Soldier pile wall Pipe-pile wall (mini-pile) Bore-pile wall Diaphragm wall

46 Case example Annex building of City University

47 Site formation to obtain a terraced land for the placing of a building - producing a retaining structure to support an adjacent structure

48 Sequence showing the forming of a multi-construction retaining wall using bore-pile and soldier-pile wall with in-situ concrete facing wall

49 Covering the retaining pile walls with reinforced concrete

50 Completion of the site formation with the retaining wall and the terrace ground formed

51 Case example Festival walk

52 Site formation for Festival Walk

53 Tat Chee Avenue KCRC Kowloon Tong Station Diaphragm wall being constructed as cut-off walling for site formation and basement construction

54 Completion of the site formation leveled to KCRC Station KCRC Kowloon Tong Station Stage 2 work construction of the basement

55 Complicated site environment of Festival Walk MTR tunnels running across the site diaphragm wall, bore-pile foundation, site formation and basement excavation almost worked at the same time

56 Approximate profile of slope before site formation Construction of the main structure of Festival Walk upon the completion of the site formation

57 Diaphragm wall panel tie back using ground anchor Forming of a temporary vertical cut as part of the site formation work to acquire land for the placing in of the main/basement structure

58 Case example Formation for the South China Sport Association extension facility

59 Cut-off wall formed by contiguous bored piles and soldier piles Site formation Extension to South China Sport Association

60 Site formation Extension to South China Sport Association Cut-off wall formed by contiguous bored piles and soldier piles

61 Site formation Extension to South China Sport Association

62 Preserved tree (die afterward) Site formation Extension to South China Sport Association

63 Site formation preservation of a protected tree species

64 Case example MTR East Tsim Sha Tsui Station

65 Tree under preservation by encasing with a concrete trough and supported using horizontal steel pipes Other examples with tree to be preserved in a development KCR East Tsim Sha Tsui Station

66 View of the preserved tree and the re-touched landscape environment after the completion of the station complex The preserved tree grow in healthy condition along the realigned road side

67 Case example CityU Academic Building 3 Works in the project include: 1. Cut-back and level the site along the existing access roadway by about 30m 2. Cut and stabilize the newly formed slope including necessary temporary surface treatment and other retaining structures. 3. Provide surface and sub-soil drainage on the newly formed slope. 4. Construct the new foundation in average 2m bore-pile for the future building. 5. Substructure of the future building including cutting into slope for locating the foundation rafts or caps. 6. Other safety and environmental protection provisions as required.

68 The site as seen in 2005

69 The site as seen in 2009

70 Early stage of site as seen in June 2008 (contract commenced in November 2007)

71 First stage of slopework being completed with temporary surface treatment using planting of grass 2 nd stage of cutting as well as forming a temporary accessway for working machines Machine (reverse circulation drill) for the forming of the bore-pile as foundation for the future building Site layout as seen in September 2008

72 Site condition as seen in November 2008 Large amount of rock stratum located on the bottom area of slope need to be cut in the final stage of formation

73 Close-up view of the bed-rock before the cutting

74 Site condition as seen in January 2009 Lower portion of slope being removed Previous retaining wall to be demolition Approx. slope profile before site formation

75 Tree to be preserved Toe of slope stabilized using soil nail Bed-rock cut to the required profile as in February 2009

76 Site condition as seen in August 2009

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78 Site condition as seen in November 2009

79 Site condition as seen in November 2009

80 Sub-structure including raft foundation, pile cap and ground beams start construction on the new formation level

81 Ma Tau Wai Service Reservoir Playground Lok Man Sun Chuen Tin Kwong Road Police Headquarters Case example Private Residential Development project in Ma Tau Wai

82 Site formation to provide land for the construction of a public housing estate (Lok Man Sun Chuen, completed in early 1970s) Police Staff Quarters and its neighborhood environment Condition of site in mid 1960s

83 Condition of site in 2006 The Site Ma Tau Wai Street Kau Pui Lung Road Tin Kwong Road

84 Location of site

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88 Site formation (overview) Private Residential Development project in Ma Tau Wai

89 Slope cutting and to form a flatten terrace on the higher side of the site to locate the upper part of the podium

90 Cutting into a part of slope to form a 40m x 50m x 30m high recess for the placing of a core wall by the use of cut-off pile wall as support

91 Part of the slope being cut and with the core wall for the future tower block being located

92 Site formation preliminarily completed and start the construction of the building

93 The future building constructed over the slope and new land formed by site formation and slope cutting

94 Core wall inside podium structure seated onto the vertical cut-back of slope formed previously

95 Stage 1 using Open Cut Excavation

96 Temp shoring Tower blocks Transfer plate constructed in sections podium Podium construction using top-down approach Ground level Bore-pile for residential tower Bore-pile and Pre-bore pipe-pile as cut-off walling provision

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98 Basement/semi basement approaching the remaining slope portion Sheung Shing Street entrance

99 Advancing of the basement raft Close-up look of the complicated shoring detail

100 The final wall Detail seeing the construction of basement at various odd and challenging locations

101 Preservation of a protected tree species using soldier pile walling

102 Estate entrance at Sheung Shing Street The protected tree forming part of the landscape provisions near the entrance to the estate

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107 Case example Redevelopment of the Marine Police Headquarters

108 Site formation (overview) Redevelopment of the Marine Police Headquarters

109 Early 2005

110 End 2005

111 Mid 2006

112 End 2007

113 Early 2009

114 Preservation of precious trees on site

115 Preservation of precious trees and other heritage structures

116 End of presentation for Site Formation