Services Provided:

• Sinkhole rehabilitation implementation
• Design of road pavement and stormwater management
• Prepare contract documentation
• Site Supervision

Project Scope:

The rehabilitation design implementation of a sinkhole, preparing contract documentation, and providing site supervision for the repair of Provincial road P36/1 (R50 Pretoria to Delmas) due to a sinkhole along the road. The sinkhole, over an area of about 300m x 35m, had been present for some time, but it was reactivated after heavy rainstorms, leading to the closure of the road in October 2019. The primary objective of our appointment is to reinstate the pavement layers after the completion of the construction work in rehabilitating the sinkhole. The sinkhole rehabilitation design does not form part of our scope and was done by leading Geotechnical Engineering experts. The road was closed due to the high risk for the development of a sinkhole, which caused mayor traffic disruptions.

Features:

Overall features of this project:

• Implement the rehabilitation measures and design to rectify the existing sinkhole in the road reserve
• Accommodation of traffic
• Stormwater management
• Soil improvement
• Site supervision

Project Value: R50 million (Est)

The post Gauteng Provincial Road P36/1: Rehabilitation of sinkhole (Km 33) on the R50 road between Pretoria and Delmas appeared first on Bosch Holdings.

LOCATION: Ceres, Western Cape

TYPE OF CONTRACT: Professional Engineering and Project Management Services (EPCM)

Services Provided:

• Visual assessment of road pavement, gravel shoulders, road furniture and drainage infrastructure
• Pavement investigation and assessment of remaining life
• Engineering design of rehabilitation and resurfacing measures
• Cost estimating
• Procurement
• Contract administration and construction monitoring

Project Scope:

This section of TR22-2 (known as the R46) measures 71km from Ceres eastwards to the N1 at Touwsrivier.

The project requires the repair, pre-treatment and resurfacing of the single carriageway road to protect the underlying pavement for an additional 10 years of expected life. Also included is the reinstatement of the gravel shoulders plus the upgrade of the first 2.5km in the recently planned urban area to urban standards.

Features:

Major elements of the contract include:

• Clearing side drains and culverts, reconstruct culvert headwalls
• Demolish and replace decks of two major culverts
• Rehabilitate and upgrade first 2.5km to urban cross section to accommodate new adjacent housing developments, including sidewalks and lighting
• Base and surface patching
• Repair edge breaks and re-gravel shoulders and lay-byes
• Slurry texturing to areas with ravelled surface
• Resurface 475 000m2 of roadway with a single or double seal as appropriate, using crumbed rubber modified bitumen and aggregate
• Asphalt overlays to major intersections
• Re-align guardrails, line marking and roadstuds

Project Value: R180million (estimate)

The post Periodic Maintenance on the TR22 Section 2 from Ceres to Touwsrivier appeared first on Bosch Holdings.

LOCATION: Thornhill, Eastern Cape

TYPE OF CONTRACT: Professional Engineering and Project Management Services (EPCM)

Services Provided:

• Geometric and pavement design
• Culvert and Stormwater design
• Cost estimating
• Procurement
• Contract administration
• Construction monitoring

Project Scope:

Provincial road DR01928 provides access for logging trucks to the Longmore forestry station. Approximately 0.7km of the gravel road ran adjacent to a stream in a deeply incised valley and was prone to flooding and damage, while the remaining 1.1km was a steep climb exiting the valley on the side of a steep slope characterised by eroded surfaces, drop-offs and unstable cut faces.

The road was severely damaged during flooding in 2006 and required emergency rehabilitation. This was achieved by the construction of 1.8km of concrete surfaced road to replace the damaged gravel road.

Also included in the project was re-gravelling of the remainder of DR01928 to the forestry station.

Features:

• Design of the valley section of the roadway to be overtopping in a 1:20yr storm, with reinforced concrete pavement (180mm thick, 30 MPa), reinforced concrete cut-off walls and gabions providing protection to the roadway (combined 9186m³ of reinforced concrete)
• Four major stormwater culvert structures extended or replaced
• Provision of extensive slope protection measures on the climb in the form of 185 No. rock anchors, plus gabions (2230m³) and stone pitching (1000m²)
• 6 511m³ of sub-base and gravel wearing course
• 292m of 450ø/600ø/900ø concrete stormwater pipes

Project Value: R 24 million.

The post Longmore Forest Road : Emergency Rehabilitation of Flood Damage appeared first on Bosch Holdings.

LOCATION: Pretoria, South Africa

Services Provided:

• Sinkhole rehabilitation implementation
• Design of road pavement and stormwater management
• Prepare contract documentation
• Site Supervision

Project Scope:

The rehabilitation design implementation of a sinkhole, preparing contract documentation, and providing site supervision for the repair of Provincial road P36/1 (R50 Pretoria to Delmas) due to a sinkhole along the road. The sinkhole, over an area of about 300m x 35m, had been present for some time, but it was reactivated after heavy rainstorms, leading to the closure of the road in October 2019. The primary objective of our appointment is to reinstate the pavement layers after the completion of the construction work in rehabilitating the sinkhole. The sinkhole rehabilitation design does not form part of our scope and was done by leading Geotechnical Engineering experts. The road was closed due to the high risk for the development of a sinkhole, which caused mayor traffic disruptions.

Features:

• Implement the rehabilitation measures and design to rectify the existing sinkhole in the road reserve
• Accommodation of traffic
• Stormwater management
• Soil improvement
• Site supervision

Project Value: R 50 million (Est).

Fee Value: R 6 million.

The post Gauteng Provincial Road P36/1: Rehabilitation of sinkhole (Km 33) on the R50 road between Pretoria and Delmas Sinkhole appeared first on Bosch Holdings.

LOCATION: Stellenbosch, Western Cape

TYPE OF CONTRACT: Professional Engineering and Project Management Services (EPCM)

Scope of Services:

• Pavement Investigation and assessment of remaining life;
• Review of drainage, road furniture and safety;
• Engineering design;
• Cost estimating;
• Procurement;
• Contract administration; and
• Construction monitoring.

Project Description:

This section of MR177 (known as the Stellenbosch Arterial or Polkadraai Road) measures 10.5km and runs between Blackheath and Stellenbosch.

The project required the pre-treatment and resurfacing of the dual carriageway road to extend the expected life of the underlying pavement by 10 years.

It also included the repair and minor upgrade of culverts, formalisation of road signage and safety review.

Features:

Major elements of the project to include:

• Drainage maintenance, including clearing of side drains and culverts;
• Culvert headwall repairs and additional new headwalls;
• Selected surface patching and mill out and replace asphalt in 5600m2 of slow lane;
• Rehabilitate 800m of dual carriageway;
• Overlay 200 000m2 of roadway with rubber modified asphalt; and
• Re-align guardrails, line marking and roadstuds.

Project Value: R60 million (estimated)

The post Road MR177 (Stellenbosch arterial) appeared first on Bosch Holdings.

LOCATION: Barkly East, Eastern Cape

TYPE OF CONTRACT: Professional Engineering and Project Management Services (EPCM)

Scope of Services Provided:

• Pavement Investigation and assessment of remaining life;
• Engineering design of rehabilitation measures;
• Cost estimating;
• Procurement;
• Contract administration; and
• Construction monitoring.

Project Description:

This section of national route R58 section 6 is approximately 62km long extending southwards from the town of Barkly East to the town of Elliot in the northern part of the Eastern Cape.

The Barkly Pass, approximately 10km long, was included in the project length.

Bosch Projects was responsible for designing the repairs and double seal resurfacing of the roadway.

Features:

Major elements of the contract were:

• Drainage improvements, including clearing, deepening, and re-grading of side drains;
• Surface and base patching and edge break repairs;
• Resurface 382 000m2 of roadway with a 14mm/7mm double seal;
• Resurface the Barkly Pass with a 20mm Cape seal (108 000 m2);
• Gabion walls to catch debris in the Barkly Pass; and
• Replace guardrails, line marking and roadstuds.

Project Value: R135 million.

The post R58-6 Barkley East to Elliot upgrade appeared first on Bosch Holdings.

LOCATION: Port Elizabeth, Eastern Cape

TYPE OF CONTRACT: Professional Engineering and Project Management Services (EPCM)

Scope of Services Provided:

• Pavement investigation and assessment of remaining life.
• Engineering design of rehabilitation and surfacing options;
• Cost estimating;
• Procurement;
• Contract administration; and
• Construction monitoring.

Project Description:

This section of the N2 national road traverses Port Elizabeth and consists of 28km (700,000m) of dual carriageway freeway in an urban environment, including 350,000m of interchange ramps and crossroads.

Bosch Projects was responsible for designing the rehabilitation and resurfacing of the carriageways, including the selection of resurfacing types appropriate for the environment (quiet UTFC in urban areas), and pavement strength (higher strength EME asphalt for heavily trafficked areas), and a double seal on sections with pavement flexibility outside of urban areas.

Features:

Key elements of the contract were:

• Drainage improvements (sub-surface, concrete lining and reshaping);
• Undercut failed areas with very poor subgrades, and rehabilitate with synthetic subgrade reinforcement, dumprock, and new layerworks;
• Widespread repairs (mill out aged surfacing and replace with asphalt);
• Mill out deformed asphalt on heavily trafficked areas and replace with high strength EME asphalt;
• Reinforcing / stress absorbing layer to limit reflective block cracking;
• Overlay with 40mm A-E2 semi-gap graded asphalt (34 000 ton) – including night work on heavily trafficked interchanges;
• Re-surface of carriageway and ramps with a UTFC (16 000 ton);
• Re-seal 224 000m2 of carriageways with a 20mm/7mm split seal;
• Bridge deck joint replacement / refurbishment; and
• Line marking and road studs.

Project Value: R205 million

Date Completed: November 2016

The post N2-11 Bramlin to Soutwerke upgrade appeared first on Bosch Holdings.

LOCATION: East London

TYPE OF CONTRACT: Professional Engineering and Project Management Services (EPCM)

Scope of Services Provided:

• Route Location and Preliminary Design.
• Acquisition of Land and Environmental Approvals.
• Appointment of Subconsultants :
  • Survey Geotechnical
  • Electrical Health and Safety
  • ISD Environmental
• Detailed Designs (geometric, structural, hydraulic and pavement)
• Cost Estimation and Procurement.
• Contract Administration.
• Construction Monitoring.

Project Description:

The planned 6 km greenfields roadway will link Beacon Bay and Gonubie across challenging terrain. The purpose of the Major Urban Arterial is to provide access to existing and new land developments between Beacon Bay and Gonubie and is being constructed in 8 phases, with Phase 1 and 2 now having been completed.

Phase 2 provided a further 680m of asphalt dual carriageway road, comprising two 3.4m wide lanes, separated by a 1.4m paved median. Pedestrian walkways and cycle lanes have been constructed on both sides to reduce potential conflict between motorists and non-motorised transport.

Due consideration was given to environmental aspects, including retaining systems to minimize scaring during construction work, erosion control, and aesthetics of the structure at the river crossing.

Features:

Key elements of the contract:

• 47 000m• of earthworks.
• Major culvert with 4 no. 5m wide x 8m high cells crossing the Quenera River, forming part of a controlled storm water management system.
• 680m of asphalt dual carriageway road, including a traffic circle, pedestrian walkways, cycle lanes, and street lighting.

Project Value: R 82m

Date Completed: July 2019

The post Beacon Bay and Gonubie Link Road appeared first on Bosch Holdings.

CLIENT: SANRAL Southern Region

LOCATION: Grahamstown, Eastern Cape

TYPE OF CONTRACT: Professional Engineering and Project Management Services (EPCM)

Scope of Services Provided:

• Geometric and pavement design
• Construction materials sourcing, proving and utilization design
• Bridge, underpass and culvert design
• Cost estimating and Procurement
• Contract administration
• Construction monitoring

Project Description:

This section of the N2 national road extends from just outside Grahamstown to beyond the summit of the Fish River Pass near Peddie and consists of 47km single carriageway road in a rural environment. Bosch Projects, the JV partner responsible for the design of the geometric and pavement upgrades, introduced substantial changes to the horizontal and vertical alignment to improve design speed and safety. The widening of the Fish River Bridge, as well as five underpasses and numerous drainage culverts are included in the scope of works. The Fish River Pass requires widening resulting in high cut slopes stabilised by anchors, shotcrete and mesh drapery. To facilitate reconstruction of the pass, a 5km bypass road was constructed around the pass using labour-intensive construction methods (macadam base). A non-motorised transport facility (donkey-cart path) was constructed to provide access to local adjoining subsistence farmers.

Features:

Phase 1 of 3 is complete, with phase 2 currently underway. Key elements of phase 1 are:

• Mass earthworks : 325 000m³ cut to fill, 210 000m³ cut to spoil, and 250 000m³ cut to stockpile for use on future phases
• 1 600m of drainage pipe (300mm to 600 mm diameter)
• 13 400m of subsoil drains and 15 820m of concrete lined side drain
• 200 000m³ of pavement layers (selected, stabilized subbase, base)
• 320 000m² Cape Seal surfacing

Project Value: R990 million

Completion Date: Phase 1 – May 2017
Completion Date: Phase 2 – May 2019
Completion Date: Phase 3 – July 2019

The post N2-13/14 Grahamstown to Fish River appeared first on Bosch Holdings.

LOCATION: Makhanda (previously Grahamstown), Eastern Cape

TYPE OF CONTRACT: Professional Engineering and Project Management Services (EPCM)

Scope of Services Provided:

• Pavement Investigation and assessment of remaining life.
• Engineering Design of rehabilitation and upgrade measures.
• Cost Estimating and Procurement.
• Contract Administration.
• Construction Monitoring.

Project Description:

The 70km length of National Route R67 Section 2 in this project extends northwards from the N2/R67 intersection outside Grahamstown (km 0) to the R67/R63 intersection outside Fort Beaufort (km 70.7). The narrow single carriageway road required pavement rehabilitation and widening to improve safety, along with drainage improvements.

Features:

Major elements of the contract were:

• Drainage upgrades, including new subsoil drains, cleaning, shaping and trimming of existing earth drains, and construction of concrete lined drains.
• Pavement repairs, including edge break repairs, repairs of distressed areas by milling and replacement with new asphalt, and base patching with emulsion treated G2.
• Base repairs to longer lengths with widespread distress by means of insitu recycling and construction of an emulsion treated base (ETB).
• Safety improvements to existing intersections along the route.
• Construction of a bitumen treated base (BTB) through the Ecca Pass.
• Widening of the existing roadway from 6.6m to 8m by means of recycling the existing shoulders, with additional G2 material and bitumen emulsion to provide an emulsion treated base (ETB).
• Resurfacing of 550 000 m2 of carriageway with a 14/7 mm double seal.
• Resurfacing of 90 000 m2 of carriageway with a 20/10 mm double seal.
• Replacement of bridge joints.
• Guardrails, line marking and roadstuds.
• Employment of 22 local subcontractors on various parts of the works.

Project Value: R218 million
Completion Date: April 2019

The post Repair and resurfacing of the R67 Section 2 appeared first on Bosch Holdings.