Nangarhar Community Infrastructure Project

Key Words• Benchmark setup

• Survey raw data

• Topography plan

• Grading

• Future line

• Purpose surface

• Purpose Building placement

Before I discus the grading plan I would like to put light on the above issues

 

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UNOPS - Afghanistan

Benchmark setup

Before implementation of construction work we have to setup tow benchmarks at the site, these benchmarks will be mad from concrete and will be located in safe area and also should be far from constriction work, and will be nominated by numbers.

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Survey row data

When we setup benchmarks at the site, then we take point from proposed area and all existing structure which is located at the site, it is called raw data, this procedure performs by total station machine when we download this data from total station it appears like this.

P/N Northing Easting Elevation P/Description 1 3809909.954 625752.999 623.917 NP2 3809915.000 625753.000 624.000 BM13 3809935.835 625749.836 623.312 TREES4 3809932.895 625750.956 623.618 TREES

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5 3809938.846 625727.273 624.012 GROUND

6 3809939.071 625735.578 623.931 GROUND

7 3809937.656 625748.227 623.821 GROUND

8 3809898.910 625756.775 623.948 FILD

9 3809898.150 625751.997 624.099 FILD

10 3809897.412 625746.093 624.023 FILD

11 3809896.451 625738.697 624.040 FILD

12 3809895.233 625731.060 624.053 FILD

13 3809938.471 625722.859 625.082 BM2

14 3809916.746 625722.813 627.726 BM3

15 3809942.235 625743.711 622.908 TREES

16 3809941.641 625749.673 622.782 TREES

17 3809945.193 625724.841 623.489 WALL

18 3809942.398 625750.287 622.935 WALL

19 3809924.210 625753.623 624.289 WALL

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Topography survey plan

• Shows actual figure of existing ground• Shows ground relief • Shows water direction

Ground relief

Water Direction

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All arrow shows water direction for us

Site Grading definition

Site grading is the process of adjusting the slope and elevation of the soil around buildings or civil structures. Prior to construction or renovation, site grading may be performed to even out the surface and provide a solid foundation, and at other times, grading may be required to improve drainage and create the desired appearance for landscaping features.

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Requirement information before site grading design

• General information about site condition• information about catchment area and water direction • Having topography plan• Having site plan • Having calculation for site cutting and filling

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Requirement information for site grading planThe giving below points shall be required on all Grading Plans:

• A. Show all existing and proposed structures above and below grade. Show all trees and indicate which ones are to be removed.

• B. Show contours indicating the existing topography of the site.• C. Show enough elevations on adjacent properties to determine

property line differentials and existing patterns.• D. Show proposed finished grade using contours and spot elevations.

These must be sufficient to indicate drainage control. Call out finish floor and pad elevations of proposed structures.

• E. Use arrows to indicate flow patterns.• F. Show north arrow, scale, and legend.

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• G. Show existing and proposed street improvements. Minor street improvements may be shown on grading plan; i.e. minor curb and gutter work, drive approach, sidewalk, etc.

• H. Show location of and provide details of all drainage structures, catch basins, gutters, etc.

• I. Show existing and proposed block walls and retaining walls.• J. When retaining walls are required, a separate permit must be obtained

from the Building Department. • K. Show the location and direction of drainage along the rear and side lot

lines. • L. Yard surfaces shall have a minimum slope of 2%.• M. Each plan sheet should have a revision block.• N. Show any other information that may be necessary for the construction of

the project or staff's interpretation of the plans.

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Equipment used in site grading

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Site grading techniques or methods used in JICA IV works

Firstly contractor should start cutting and use suitable martials for filling, Should it be so instructed by the relevant design drawing, the Contractor shall grade the site by means of cutting and filling to create the design ground level, and inspected by the Implementing Agency.

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Implementing site grading works in JICA IV – process and roles/responsibilities

UNOPS has a social and professional responsibility to manage all construction works that involve the grading of an area where the slope of the area is to be excavated or filled; the excavation, fill, or rearrangement of earth material on any site; all grading or clearing operations; the excavation or fill of any portion of a site that increases or decreases its elevation following the completion of grading at any point; the diversion of rainwater runoff from an area that is greater than the impervious area threshold for new development; the blockage or alteration of a waterway or drainage way; or the excavation for the installation, removal, or repair of any underground structure.

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Challenges applying site grading techniques in JICA IV subproject sites

• Existing building which is located at the site• Existing walls • Trees• Existing schools hasn’t build according to grading plan• All site plan dimension is not according to site condition • Site plans elevations are not matching to existing ground• All existing and purposed buildings don’t have coordinate

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Recommendations for best practices in site grading for building construction works

• New survey Should be conduced • Prepared new topography plan • Deploy site plan on the topography• New grading plan should be designed

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Questions & Answers

Thank you.