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Measurement for Civil Engineering works -Retaining Wall-

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Presentation on theme: "Measurement for Civil Engineering works -Retaining Wall-"— Presentation transcript:

1 Measurement for Civil Engineering works -Retaining Wall-

2 Overview A retaining wall is generally defined as a vertical wall that holds back earth. However a retaining wall has many uses such as: A retaining wall is generally defined as a vertical wall that holds back earth. However a retaining wall has many uses such as: A retaining wall for roadside embankments A retaining wall for roadside embankments A retaining wall can separate older roads from highways A retaining wall can separate older roads from highways A house retaining wall for the garage A house retaining wall for the garage A retaining wall helps keep river banks from eroding A retaining wall helps keep river banks from eroding A retaining wall to keep earth from stairwells and driveways A retaining wall to keep earth from stairwells and driveways

3 Common materials used for retaining walls Wood sheets; Steel and plastic interlocking sheets; Reinforced concrete sheets; Pre cast concrete elements (crib walls and block walls); Closely spaced in-situ soil-cement piles; Wire-mesh boxes (gabions); Anchors into the soil or rock mass (soil nailing).

4 Earth-retaining structures

5 Gravity wall

6 Crib wall

7 Gabion wall

8 Cantilever wall

9 Common types of retaining wall (sides of highway / expressway) block retaining wall Vegetative retaining wall

10 Common types of retaining wall ( hill side building development) Segmental block retaining wall system Concrete retaining wall

11 Drainage system in retaining walls

12 Section view- concrete retaining wall Temporary formwork is a MUST to form the shape of retaining wall before in-situ concreting works coming in concreting works and concrete hardening to form the final product of retaining wall structure

13 Section view- Segmental blocks retaining wall

14 Section view- Vegetative retaining wall

15 Section view- concrete retaining wall Concrete base footing Retaining wall Ground level Depth of excavation

16 perspective view- concrete retaining wall length height width Buttress / piers

17 Measurement Principles Element: mass concrete retaining wall ***Refer to drawing given; Main components: 1. Concrete foundation / bases for retaining wall 2. Concrete retaining wall 3. Concrete piers 4. Weep holes (drainage ) 5. Pocket of granular fill Total measured length for retaining wall = m

18 Taking-off lists (lists of items to be measured) Excavation works Excavation works E – excavation, foundation, earth -starting from commencing level – m3 E – excavation, foundation, earth -starting from commencing level – m3 Concreting works Concreting works F – In situ concrete designed mix, Grade 25, in bases – m3 F – In situ concrete designed mix, Grade 25, in bases – m3 F – In situ concrete designed mixed, Grade 30, in retaining wall – m3 F – In situ concrete designed mixed, Grade 30, in retaining wall – m3 F – In situ concrete designed mixed, Grade 30, in piers – m3 F – In situ concrete designed mixed, Grade 30, in piers – m3

19 Taking-off lists (lists of items to be measured) Formwork Formwork F – Formwork, to sides, of bases – m2 F – Formwork, to sides, of bases – m2 F – formwork, to back sides. of retaining wall – m2 F – formwork, to back sides. of retaining wall – m2 F – Formwork, to end sides / faces, of retaining wall – m2 F – Formwork, to end sides / faces, of retaining wall – m2 F – Formwork, to sloping faces of retaining wall – m2 F – Formwork, to sloping faces of retaining wall – m2 F – Formwork, to sides, of piers. – m2 F – Formwork, to sides, of piers. – m2

20 Taking-off lists (lists of items to be measured) Drainage Drainage H – outlet structures, 100mm diameter weep 1.8m centre, inside the retaining wall – nos. H – outlet structures, 100mm diameter weep 1.8m centre, inside the retaining wall – nos. Filling Filling E – Filling, to structures -between piers, pocket of granular material, continuously. – m3 E – Filling, to structures -between piers, pocket of granular material, continuously. – m3

21 Techniques to take-off into dimension paper Techniques to take-off into dimension paper

22 Billing paper Billing paper


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