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Manhole, has double walled construction supporting inner and outer covers at and below street level
Manhole, has double walled construction supporting inner and outer covers at and below street level
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机译:沙井,有双壁结构,可支撑街道以下及以下的内外盖
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摘要
The manhole (1) is double-walled, the inner wall (5) supporting an inner manhole cover (6) located below street level (4), whilst the outer wall (7, 8) supports an outer manhole cover (9) located at street level. The outer wall length can be altered.
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