Yoshinori Ito Director for Road Maintenance Construction Bureau, - - PowerPoint PPT Presentation

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Yoshinori Ito Director for Road Maintenance Construction Bureau, - - PowerPoint PPT Presentation

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RPUG-PDRG 1st Joint Meeting Keynote Lecture Road Surface Management in Sapporo City -Policy and Practice in the Cold Region- Yoshinori Ito Director for Road Maintenance Construction Bureau, Sapporo City April 19, 2019

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Road Surface Management in Sapporo City

  • Policy and Practice in the Cold Region-

Yoshinori Ito

Director for Road Maintenance Construction Bureau, Sapporo City April 19, 2019

札幌市建設局

RPUG-PDRG 1st Joint Meeting Keynote Lecture

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Contents

札幌市建設局

2

⚫ Administrative Strategy for M&R of

Arterial Roads in Sapporo City

⚫ Winter Road Management

in Sapporo City

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  • 1. Background

札幌市建設局

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・1972 the Winter Olympic Games ・Rapid Growth of Population

・ Increase of road construction and development Road facilities have been aging... repair and reconstruction will be more and more difficult.

◆Amount of Road Facilities (as of April 1, 2017)

City Roads 5,514 km Bicycle & Pedestrian Paths 111 km Bridges 1,287 Pedestrian Bridges 42 Tunnels 16 Road Lightings >136,000 Road Signs > 46,000

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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  • 1. Background

札幌市建設局

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Operating Expenses and Length of City Roads

5,000 5,100 5,200 5,300 5,400 5,500 5,600 5,700 20 40 60 80 100 120 140 （km） （億円） Operating Expenses (Left axis) Road Length (Right axis) Administrative Strategy for M&R of Arterial Roads in Sapporo City (Billion Yen)

14 12 10 8 6 4 2

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  • 2. Policy

札幌市建設局

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Fundamental Administration Policy

  • n Road Management

(established in 2010.3）

[Project Planning for Facility Management]

・ Road Bridges ・ Large Scale Tunnels ・ Large Scale Culverts and Sheds ・ Pedestrian Bridges ・ Pavements ・ Others （establis lished in in 2012.3 .3, , re revis ised in in 2018.3 .3 ）

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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  • 3. Fundamental Policies

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1.

Setting management criteria based on road characters (e.g. traffic volume)

2.

Securing driving safety with maintenance activities considering the environmental characteristics of snow and cold region

3.

Minimizing life cycle costs with adequate repair treatments in an appropriate phase

4.

Sustaining amendment of the plan based on present road conditions surveyed quantitatively

Administrative Strategy for M&R of Arterial Roads in Sapporo City

札幌市建設局

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SLIDE 7

Determination of maintenance Criteria Deterioration Prediction and LCC Analysis Site Identification and Repair Method Selection Medium-term Simulation Present Condition Survey Road Network Definition

  • 4. Planning Flow

札幌市建設局

7

Administrative Strategy for M&R of Arterial Roads in Sapporo City

Grouping of the Targets

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  • 5. Road Network Definition

札幌市建設局

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Legend Arterial Roads Emergency Routes (other than Arterial Roads) National Highways

Arterial Roads (≒ 460 km) +Emergency Routes (≒ 110 km) ≒ 570 km

Targets

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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  • 6. Present Condition Survey (periodical)

札幌市建設局

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  • Quantitative inspection by a survey vehicle every

three years

  • Employing four indices: “Crack Ratio”

, “Rut Depth” , “Unevenness σ” , and “IRI”

Surface Condition Survey Vehicle

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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  • 7. Determining Maintenance Criteria

札幌市建設局 10 ■ Determining maintenance criteria by grouping

the road network according to the total and truck traffic volume

■ Weighting the criteria based on the traffic

volume (High volume roads are more severe than low volume roads)

Administrative Strategy for M&R of Arterial Roads in Sapporo City

(Acceptable Threshold of Surface Condition)

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  • 7. Determining Maintenance Criteria

札幌市建設局 11

Group (Length, Ratio) Track Traffic: High (One-way ADTT ≥ 1,000) Track Traffic: Low (One-way ADTT < 1,000) Total Traffic: High ( ADT ≥ 20,000) Group 1 110 km (19.2%) Group 2 48 km (8.4%) Total Traffic: Low ( ADT < 20,000) Group 3 61 km (10.7%) Group 4 353 km (61.7%)

Grouping

Group Maintenance Threshold Values Crack Ratio Rut Depth Unevenness σ IRI 1

20% 25 mm 5.0 mm 7.1 mm/m

2 3

25% 30 mm 6.0 mm 8.5 mm/m

4

Criteria

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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  • 7. Determining Maintenance Criteria

A schematic Illustration of 20% Crack Two longitudinal cracks on a lane

Crack Ratio

Rut Depth

An image example of 20-40 mm rutting

12

札幌市建設局

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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  • 8. Deterioration Prediction

札幌市建設局 13

Prediction Model for Surface Deterioration

Development of linear regression models for surface deterioration prediction based on the inventory of survey data

Linear Regression Model for Surface Deterioration Prediction

Road Class Item Unit Prediction Model Initial Value Arterial Road Crack Ratio % Ci+1=1.065Ci+0.845 0.0% Rut Depth mm Wi+1=0.991Wi+0.656 0.0 mm Unevenness σ mm σi+1=0.999σi+0.108 1.0 mm IRI mm/m IRIi+1=1.012IRIi+0.141 1.5 mm/m

* Ci, Wi, σi, IRIi indicate values obtained in the surveyed year. i+1 stands for the values in the next year. Administrative Strategy for M&R of Arterial Roads in Sapporo City

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札幌市建設局 14

管理目標：グループ①、② 管理目標：グループ③、④

  • 8. Deterioration Prediction

Prediction for Crack Ratio Crack Ratio (%) FY2017 Threshold for Group 3 and 4 Threshold for Group 1 and 2 Pavement Service Life (years) Administrative Strategy for M&R of Arterial Roads in Sapporo City

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10 20 30 40 50 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 ひび割れ率（％） 供用年数(年)

  • 9. LCC Analysis

札幌市建設局 15

30 yeas- Mill and Overlay 46 years- Replacement 36 years- Mill and Overlay 46 years- Sealing 45 yeas- Mill and Overlay

Threshold

28 years- Sealing

20,000 40,000 60,000 80,000 100,000 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 累積費用(千円/1300㎡) 供用年数(年)

Surface Condition (Crack Ratio)

Preventive Maintenance I Preventive Maintenance II Breakdown Maintenance

Crack Ratio (%) Pavement Service Life (years)

15 yeas- Mill and Overlay 18 years- Mill and Overlay 23 years- Replacement

Accumulation Expense (1,000 yen/1,300m2)

10 years- Sealing 10 years Sealing 15 yeas- Mill and Overlay 18 years- Mill and Overlay 23 years- Replacement 28 years- Sealing 30 yeas- Mill and Overlay 36 years- Mill and Overlay 45 yeas- Mill and Overlay 46 years- Replacement 46 years- Sealing

Pavement Service Life (years)

LCC = Users’ Expenses + Administrators’ Expenses

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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  • 10. Maintenance and Rehab Method

札幌市建設局 16

Repair Methods

  • Inject sealants into cracks at crack ratio of 10%
  • Mill and overlay surfaces and/or binder courses exceeding

maintenance criteria

  • Wearing Course:
  • Group 1 and 3: Polymer modified Asphalt Type II
  • Group 2 and 4: Recycled Asphalt

Injection of Sealants Mill and Overlay Administrative Strategy for M&R of Arterial Roads in Sapporo City

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SLIDE 17

札幌市建設局 17

Surface Distress Identification

http://www2.ceri.go.jp/jpn/iji/taikyuusei_handbook/form.html

  • 10. Maintenance and Rehab Method

Traffic Load

Water Infiltration into Subbase Course Snowmelt Water

  • n Surface

Surface Course Binder Course Base Course

Granular Subbase Asphalt Mixture Layer Subgrade

Potholes occur due to progress

  • f aggregate scattering

Granular Subbase Asphalt Mixture Layer Subgrade

Surface Course Binder Course Base Course

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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札幌市建設局 18

Injection of Sealants for Crack Repair

  • 10. Maintenance and Rehab Method

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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SLIDE 19

札幌市建設局 19

Construction Joint Distress How to repair: L-type Joint Sealing

ニチレキ株式会社カタログより

  • 10. Maintenance and Rehab Method

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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SLIDE 20

ACTIO ION

Extract the Issues Verification of Maintenance Criteria Verification of the Deterioration Prediction Models

PLAN

Determination of Maintenance Criteria

Revision of the M&R Plan

Deterioration Prediction/LCC Analysis Estimation of Repair Expenses

CHECK

Repair Method Selection

DO DO

Inspection

（Surface Condition Survey）

Diagnosis

( Health Assessment)

Treatment

(Implementation of Maintenance and Rehabilitation)

Recording

(Database Construction)

[Maintenance Cycle]

  • 11. PDCA Cycle for Sustainable Implementation

札幌市建設局 20 Inspection and Surveying Methods Impact of Repair Deterioration Factor Analysis

Administrative Strategy for M&R of Arterial Roads in Sapporo City

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  • 1. Snow Removal & Hauling Operation

札幌市建設局 21

Snow Removal

④Snow hauling - hauling piled snow to disposal sites

Hauling

Winter Road Management in Sapporo City

Pushing snow to the side of the road ① Fresh snow plowing - push new-fallen snow aside ② Widening operation - widening the road widths that have been narrowed ③ Surface leveling operation - flatten rough surfaces

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  • 1. Snow Removal ① Fresh Snow plowing

札幌市建設局 22

Secure road traffic by pushing new-fallen snow to the road side

Winter Road Management in Sapporo City

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札幌市建設局 23 札幌市建設局 23

Widening of the effective road width by piling up the road snow

  • n the snowbank.
  • 1. Snow Removal ② Widening Operation

Winter Road Management in Sapporo City

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札幌市建設局 24

Grinding and removal of the snow/ice covering road surface to flatten

  • 1. Snow Removal ③ Surface Leveling Operation

Winter Road Management in Sapporo City

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札幌市建設局 25

Loading up the road shoulder snow on dump trucks Hauling the snow to disposal sites or thawing facilities

Thawing Facility Disposal Site Snow Hauling Operation

  • 1. Snow Removal ④ Snow Hauling

Winter Road Management in Sapporo City

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  • 2. Countermeasure of Icy Roads

札幌市建設局 26

①Sprinkling anti-icing chemicals and anti-skid materials ②Placing sandboxes (free of use) ③Installing road heating systems (de-icing)

① ② ③

Winter Road Management in Sapporo City

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・1972 the Winter Olympic Games ・Rapid Growth of Population

  • 3. Overview of Snow-related Projects

札幌市建設局 27

・ Development of snow-related project

A problem is to secure the snow removal system and treatment facilities for the socio-economic situations with aging road facilities and decreasing working-age population.

◆ Summary (as of Oct. 1, 2017)

Roadway snow removal 5,514 km Walkway snow removal 3,025 km Snow hauling (Arterial) 1,376 km Snow hauling (Residential) 3,084 km *with regional collaboration (other than school roads) Intersection snow clearing 16,255 Snow disposal sites 73 Thawing Facilities 11 Anti-icing (roadway) 1,068 km Anti-icing(walkway)) 311 km Sandbox 1,214 Road heating 550

Winter Road Management in Sapporo City

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  • 4. Sustainable Snow Removal System

札幌市建設局 28

Brief History of Snow Removal System 1992 Establishment of Multi-zone System (route oriented -> area oriented)

* Deployment of snow removal teams conducting the roadway and walkway snow removal and the hauling

  • perations comprehensively.

2010 Integration Summer and Winter Road Maintenance, Consolidation of Multi-zones

* Contract term ： Nov. to Mar. ⇒ Oct. to Sep. (annually) * Road patrol, pavement maintenance, and weeding

  • peration of the river fronts are included.

* Number of zones: 39 to 23

  • > Contribution to employment stabilization, retaining human

resources, and maintaining necessary equipment

Winter Road Management in Sapporo City

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  • 5. Maintenance of Snow Treatment Facilities

札幌市建設局 29

Snow Treatment Facilities

Thawing Facilities (Capacity ≃ 1,000,000 m3) 0.8 billion JPY/yr Road heating systems (installed ≃ 220,000 m2) 1.9 billion JPY/yr

  • > Some of the road heating systems have gradually been

suspended since 1998.

Rearrangement of Road Heating operation 1988~ installed in arterial roads with a slope over 4% (against the limitation of studded tires use) 1998~ suspended on some roads with a slope less than 6% (due to the development of studless tires and anti-icing chemicals, and the improvement of pavement surfacing materials)

Winter Road Management in Sapporo City

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  • 6. Suspended of Road Heating

札幌市建設局 30

Overview Total Area ≃ 300,000 m2 Suspended Area ≃ 100,000 m2 ⇒ Currently Working ≃ 220,000 m2 Alternatives of Road Heating System ■Increase of the frequency of sprinkles of anti-icing chemicals (1~2 times/day -> 4 times/day) * Effective duration of the chemicals is about 6 hours ■Improvement of the function of pavement surfaces (replacing the wearing course by stone mastic asphalt) * increase of tire-surface friction, residual effect of anti-icing chemicals

⇒ Further performance improvement on treatments of icy roads!!

Winter Road Management in Sapporo City

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札幌市建設局土木部道路維持課

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Questions ?

⚫ Thank you for listening ⚫ If you have any questions,

I would be happy to answer them