PUBLIC WORKS PRIMARY GRID - TYPICAL CROSS SECTION SUBGRADE DATE: 2017 SCALE: NTS DRAWN BY: WOOD E&I

Transcription

1 PUBLIC WORKS PRIMARY GRID - TYPICAL CROSS SECTION SUBGRADE DATE: 2017 SCALE: NTS DRAWN BY: WOOD E&I

2 1. Descriptin Rad design and cnstructin standards fr graveled Primary Grid and Heavy Haul rads as designed within the Rural Municipality f Crman Park, N. 344 (Municipality). 2. Miscellaneus Fr the purpses f this dcument, the term prpnent shall be used t address duties that shall be undertaken by the wner, develper, cntractr and engineer interchangeable. During cnstructin, the prpnent shall be respnsible fr all traffic accmmdatin measures. This shall include but nt limited t: Prper signing f all access rads whereby traffic (cnstructin r lcal) may access existing Municipality rads. Traffic gravel shall be applied, if r as necessary fr lcal traffic. Prper measures shall be taken t ensure that lcal traffic can safely interact with cnstructin equipment. The prpnent shall ensure that all necessary Haul Rad Agreements are in place including any prvisins fr dust cntrl prir t the hauling f materials. Dust cntrl t be applied n any apprved detur rutes. 3. Required Right-Of-Way Standards Minimum allwable Right-f-Way (ROW) purchased shall be 46.0 meters (m). With special apprval, the Municipality may permit that a 30.0 m ROW be purchased and utilized. The prpnent shall be respnsible fr the purchase f all ROW. The rad shall be designed and cnstructed in the center f the ROW unless with special permissin f the Municipality. Dust cntrl t be applied n any apprved detur rutes. 4. Rad Widths and Gemetric Standards 4.1. Finished Rad Width and Height The finished graveled driving surface shall be as fllws: Fr fill heights n straight sectins (nt in curves), with a fill height f 0.0 t 2.0 m, an 8.6 m rad tp width (graveled surface) shall be required. Fr fill heights in curves, with a fill height f 0.0 t 2.0 m, a 9.0 m rad tp width (graveled surface) shall be required. Fr fill heights f 2.0 t 3.0 m (where the rad surface is frm 2.0 m t 3.0 m in height), a 9.0 m finished rad tp width shall be required. Issued Date: Nvember 9, 2017 Page 1 f 8

3 Fr fill heights greater than 3.0 m (where the rad surface is frm 3.1 metres in height r mre), a 9.0 m finished rad tp width shall be required. The rad crss-fall (slpe) shall be cnstructed t a minimum 3.0% and maximum 4% slpe. Curve radius, transitin and superelevatin fr curves shall be as per the Saskatchewan Ministry f Highways and Infrastructures Design Manual fr a 80 km/hr design speed. The average shulder elevatin f the rad surface shuld be apprximately 0.8 m t 1.0 m abve the adjacent grund except in cut areas. The subgrade surface shall nt be less than 1.5 m abve high water level n the grund water table. (ie: level t which free water wuld rise in a hle sunk in the grund) Surfacing and Hydraulic Design A grading, surfacing and hydraulic design shall be cmpleted, signed and stamped by a Prfessinal Engineer registered with the Assciatin Of Prfessinal Engineers and Gescientists f Saskatchewan (APEGS) and licensed t practice (Permissin t Cnsult in this field f expertise) within the Prvince f Saskatchewan. The surfacing structure shall be based upn the Saskatchewan Ministry f Highways and Infrastructure s Shell Curve methd and shall be based n a 15 year design life (N 15). Sils testing shall be in accrdance with the Saskatchewan Ministry f Highways and Infrastructure s Standard Test Prcedures manual. Hydraulic structures (culverts) with significant flws shall be designed (sized) in accrdance with the Saskatchewan Ministry f Highways and Infrastructures Hydraulic Manual and shall be based n a Q 25 flw (1 in 25 year (1:25)) frequency. The Municipality may request that the design be based n a Q 50 flw (1 in 50 year (1:50)) frequency based n the lcatin (prximity) f any residences upstream f the crssing. The prpnent shall apply fr, and shall meet all f the listed requirements, an Aquatic Habitat Prtectin Permit (AHPP) frm SaskWatershed Authrity fr hydraulic passages requiring such Sideslpes Sideslpes shall range frm 3:1 t 4:1 depending upn situatin and with apprval frm the Municipality. The standard required sideslpe shall be 4:1. Fr rad fills ranging frm 0.0 t 3.0 m in height, the sideslpe shall be 4:1. Fr rad fills ranging in height frm 3.0 m t 4.0 m, the te f slpe shall be 12.0 m frm shulder f the rad. Fr rad filles greater than 4 m the sideslpe shall be 3:1. If upn review by the Municipality, a sideslpe f 3:1 may be allwed nly with special permissin frm the Municipality. Issued Date: Nvember 9, 2017 Page 2 f 8

4 4.4. Ditch Bttm Widths Ditch bttm widths shall be range frm 5.0 t 6.0 m depending upn grade height and backslpe requirements. The desirable is 6.0 m fr snw strage Backslpes Sideslpes shall range frm 5:1 t 3:1 depending upn the situatin and with apprval frm the Municipality. The standard required back slpe shall be 5:1. A backslpe f ranging frm a minimum f 3:1 t the standard backslpe f 5:1 will be allwed in cnjunctin with maximizing the ditch bttm width Maximum Rad Gradient The maximum rad gradient allwed shall be 6.0%. With special apprval by the Municipality, a 7.0% gradient may be allwed Stpping Sight and Intersectin Distances The stpping sight distance fr intersectins with any rad shall be a minimum f 140 m. This is based upn the SARM guidelines fr an 80 km/hr rad design. The minimum length f rad (cnstructed past an apprach) shall be 100 m. This is dne in rder t meet Stpping Sight Distances, snw and ice remval and rad maintenance. Fr intersecting rads, the sight triangles shall be clear f any bstructins. The sight triangle shall be a minimum f 85.0 m frm the pint f intersectin n municipal rads and grid intersectins and t a maximum f m n primary grid rads using 80 km/h design speed. 5. Snw Clearance Standards When shulder grade elevatin is 0.3 m r less abve natural surface at 21.0 m frm center line then the backslpe must be flattened using a variable slpe f 5:1 t a maximum f 3:1. 6. Rad Cnstructin 6.1. Clearing and Grubbing Timber, brush, duff (vegetatin), rts, lgs and stumps shall be cmpletely cleared frm the surface f the Right-f-Way. Debris frm clearing and grubbing peratins shall nt be used in the cnstructin f embankments (any prtin f the rad structure). Debris frm clearing and grubbing peratins shall nt be buried within the Right-Of- Way. Issued Date: Nvember 9, 2017 Page 3 f 8

5 6.2. Remval and Replacement f Tpsil All tpsil within the Cnstructin Ftprint shall be remved and stckpiled. The Cnstructin Ftprint is defined as the area within the cut r fill stakes. The Cntractr shall install apprpriate sediment cntrl t ensure n sedimentatin frm tpsil stckpiles enters int adjacent water bdies. Upn cmpletin f the cnstructin, tpsil shall be replaced t a unifrm depth ver the Cnstructin Ftprint excluding the rad surface. The maximum cmpacted depth f tpsil replaced will be 100 mm. Stnes (rcks) 75 mm r mre in diameter shall be remved and dispsed f frm the tpsil replaced Drainage (culvert) Installatins If the fundatin is unsuitable, the bttm f the bed shall be sub-cut t a minimum f 0.3 m belw the granular backfill layer. A getextile fabric shall be installed t separate the grund surface frm the granular materials. A minimum 8 unce (Getex 801 r equivalent) nnwven getextile shall be used. The bedding line shall be shaped t fit the culvert. Crrugated metal pipe culverts (CSP) shall be placed with the inside circumferential laps pinting dwngrade and with the lngitudinal laps at the sides r quarter pints. The sectins f the culvert shall be firmly jined with cupling bands. Jints shall be as tight as pssible. Culverts shall be t the fllwing minimum sizes unless larger sizes are required t meet flw requirements: Apprach culverts shall be a minimum f 400 mm in diameter. Thrugh grade culverts shall be a minimum f 600 mm in diameter. CSP culverts shall have a minimum thickness f 2.0 mm (12 gauge). Granular material shall be cmpsed f sand r gravel free frm undesirable quantities f sft r flaky particles, lam, and rganic r ther deleterius material. Granular material shall cmply with the fllwing requirements: Sieve Designatin Percent by Weight Passing Canadian Metric Sieve Series TYPE mm mm μm μm μm μm Plasticity Index Fr backfilling all types f culverts and bridge abutments, Type 115 shall be used. Fr backfilling subsurface drain pipes, Type 116 shall be used as a filter Material. Issued Date: Nvember 9, 2017 Page 4 f 8

6 Fr backfilling curbs, curbs and gutters, sidewalks, driveways, strm sewers, and manhles, catch basins, and ther ancillary structures, Type 10 shall be used. Earth backfill under the haunches f culverts, except thse in appraches nt t be paved, and plyethylene pipe culverts, shall be cmpacted with mechanical impact tampers. After the earth backfill and granular backfill has been placed and cmpacted arund the culvert, the remainder f the embankment shall be cnstructed by drying the earth material t at least the ptimum misture cntent and cmpacted t an average f nt less than ninety-eight (98) percent f the maximum density as determined by a Saskatchewan Ministry f Highways and Infrastructure Standard Prctr test. The earth material abve the bedding line shall be placed, simultaneusly and unifrmly, in lifts n each side f the culvert. In subcut sectins, the lift shall extend t the limits f the sub-cut; therwise the lifts shall extend nt less than 15 m frm each side f the culvert. N bjectinable material shall be used within that prtin f the embankment abve r belw the bedding line n culverts thrugh the radbed. The embankment, within three diameters r three span; f the culvert barrel, shall be free frm rcks having a dimensin f 80 mm r greater when measured in any directin. Randm riprap shall be installed at all culvert lcatins where the culvert diameter is greater than 800 mm. A nnwven getextile shall be placed prir t the placement f the riprap material Subgrade Embankments Earth embankments shall cnsist f acceptable earth material and rck material free frm bjectinable quantities f rganic matter, frzen sil, stumps, trees, mss, and ther unsuitable materials. The embankment shall be cnstructed by placing the material in successive layers. The depth f each layer shall nt be mre than fifteen (15) centimetres (cm) uncmpacted. The full width f each segment f each layer shall be bladed with a mtr grader at least twice prir t being cmpacted. The slpes and surface f the embankment shall be shaped and trimmed t a unifrm smth surface cnfrming t the crss-sectins shwn n the plans, r as staked. Stnes having a dimensin f eight (8) cm r mre when measured in any directin shall be remved frm the tp fifteen (15) cm f the subgrade. The fllwing requirements will apply fr all embankments: When unsuitable material is encuntered belw the natural grund surface in embankment areas, the material shall be excavated and remved. The embankment layer (ther than at culverts including the sub-cut backfill layer) frm 750 mm t 600 mm belw the tp f the subgrade shall be dried t within 3% f the ptimum misture cntent. Issued Date: Nvember 9, 2017 Page 5 f 8

7 Each layer f the tp 600 mm f the subgrade shall be dried t at least the ptimum misture cntent and cmpacted t an average f nt less than ninetyeight (98) percent f the maximum density as determined by the Saskatchewan Ministry f Highways and Infrastructure Standard Prctr test. The misture and densities will be cnsidered satisfactry when: All individual misture test results are equal t r less than the ptimum misture cntent. Density test results average nt less than ninety-eight (98) percent f the maximum density. All individual density tests are greater than ninety-five (95) percent f the maximum density. If the misture existing in the sil is insufficient fr cmpacting t the specified density and fr finishing, the prpnent may elect t add water. The freging requirements will als apply t backfill f subcuts and the embankment required t prepare the beds and backfill drainage structures. If cnstructing utilizing sand materials, a 0.3 m clay cap may be required fr the final surface befre traffic gravel incrpratin and graveling. Appraches t be cnstructed as per Municipalities Apprach Cnstructin plicy Traffic Gravel Traffic gravel shall cmply with Type 103 and Type 106. Sieve Designatin Percent by Weight Passing Canadian Metric Sieve Series TYPE mm mm mm mm mm mm μm - Fractured Faces 50% Minimum 40% Minimum A tlerance f 3% in the percent by weight passing the maximum size sieve shall be permitted Traffic Gravel Incrpratin The wrk will cnsist f Type 103 Traffic Gravel unifrmly mixed with the insitu material in the tp f the subgrade. The gravel shall be unifrmly mixed with the subgrade material int the tp 75 mm f the finished rad tp surface. The mixture f gravel and subgrade material shall be packed enugh t prduce a smth firm surface that will supprt nrmal rad traffic withut rutting r becming unstable. Issued Date: Nvember 9, 2017 Page 6 f 8

8 The amunt f gravel t be blended int the subgrade may vary but will nrmally be between 190 m 3 per kilmetre (400 yds 3 per mile) depending upn the subgrade width. Adding water t the mixture may be required if there is insufficient misture t prduce a stable driving surface during the cmpactin phase. All surplus rck, 80 mm and larger, shall be remved frm the surface and dispsed f. All small rcks frm thirty (30) mm t seventy-five (75) mm shall be bladed ff the rad tp int the ditch r nt the sideslpe Traffic Gravel Behind Cnstructin Type 106 Traffic Gravel shall be placed and spread n a newly cnstructed subgrade surface. Traffic gravel Type 106 shall nt be depsited until the subgrade surface has been cmpacted (t the required density), trimmed and accepted. Traffic gravel shall be dumped and spread unifrmly n the subgrade surface at the rate f at the rate f 200 m 3 /km fr the first applicatin; 200 m 3 /km fr the year fllwing cnstructin and additinal applicatins as required. Traffic gravel shall be applied t the finished surface f all appraches Seeding Prir t seeding, the area t be seeded shall be true t grade and crss sectin and free frm irregularities. The prpnent shall harrw the seeded areas immediately after the seeding is cmpleted. The seed material shall cntain the fllwing blend f seeds: Seed Mix Cmmn Name % f Mix Sheep's Fescue 15 Canada Blue Grass 15 Blue Fescue 15 Hard Fescue 15 Chewings Fescue 15 Creeping Red Fescue 15 Perennial Rye Grass 10 The seed applicatin rate shall be 14 kg per hectare (31 lbs per acre). The Municipality may apprve ther grass seed mixtures having similar grass seeds r slight changes in mixture percentages. Issued Date: Nvember 9, 2017 Page 7 f 8

9 7. Design and Cnstructin Certificatin The Municipality reserves the right t request any and/r all test result(s) r ther assciated dcumentatin at any stage f the prject. Upn cmpletin f the prject and prir t the start f the warranty perid, the prpnent s Engineer and/r engineering firm shall cmplete and submit a signed and sealed Statutry Declaratin stating that all design and cnstructin criteria/specificatins in accrdance with the parameters afrementined have been met. The Engineer f Recrd shall be a Prfessinal Engineer registered with the Assciatin Of Prfessinal Engineers and Gescientists f Saskatchewan (APEGS) and licensed t practice (Permissin t Cnsult) within the Prvince f Saskatchewan. The Engineer(s) f Recrd shall have reviewed and/r been invlved with the design and/r cnstructin f the prject and shall have firsthand knwledge f the wrk cmpleted. Issued Date: Nvember 9, 2017 Page 8 f 8