熱烈祝賀本公司投獲香港特別行政區政府房屋署 2015 至2017 年度地下管線勘測定期合約 合約編號20130098,價值23,369,000港元。
FORWIN Site Investigation Engineering Ltd.
   
地下管線探測
地下帶水設備勘察工作
管道滲漏探測
地型測量
快速紅外線檢測
結構測試
   
   
  探測工程内容    地下帶水設備勘察工作
  Manhole Survey 沙井測量
High Pressure Water Jetting 高壓水力管道清洗
Closed Circuit Television Survey (CCTV) 渠道內閉路電視探測
Relining – Full Pipe Lining & Rehabilitation 全管及部份管道修補系統    
 

沙井測量
Manhole Survey

Manhole Survey was carried out prior to CCTV survey to measure the conditions of manholes and related pipe information.

Manhole Survey Measurement
Measurement of pipe depths must always be taken from the point on the cover frame above the‘X’pipe, this point should be marked with a spray painted ‘T’.

All pipe depths should be taken from this ‘T’ point vertically and not on an angle. The way to do this is to measure the shaft depth D and then measure the depths from where the pipe enter the chamber to the underside of the slab and add the two together,
i.e. D + F, D + E or D + G.


Where the chambers have a tapered slab the measurement of depths is more difficult but is still measurable as follows.

Standard sizes for drainage and sewerage pipes are as follow:
100 mm, 150 mm, 225 mm, 300 mm, 375 mm, 450 mm, 525 mm, 600 mm, 750 mm, 900 mm, 1050 mm, 1200 mm, 1350 mm, 1500 mm etc.

a.) When measured size is less than 10mm from the standard size, use standard size.
b.) When measured size is more than 10mm from the standard size use actual size.


Example:
Measured Sized Filled in Size

90 mm 100 mm
595 mm600 mm
80 mm80 mm
1000 mm1000 mm
550 mm550 mm
Method of Measuring of Standard Pipe Size:
 
 
量度沙井尺寸   沙井內部


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