AR-assisted Work Management

Offers greater efficiency in earthwork quality control operations(AR) ‫إدارة اﻹﻧﺸﺎءات ﺑﺎﺳﺘﺨﺪام اﻟﻮاﻗﻊ اﻟﻤﻌﺰز‬‫ﺗﺤﺴﯿﻦ رﻗﺎﺑﺔ ﺟﻮدة أﻋﻤﺎل اﻟﺤﻔﺮ اﻟﮫﻨﺪﺳﯿﺔ‬■ Overview
Conventionally, earthwork in civil engineering
projects has been done depending on on-site
physical stake markers. Modern ICT-based
earthwork technology *１, which is already widely
employed in road construction projects, makes
stake markers unnecessary as positions areelectronically measured by the power machinery
using GNSS signals. However, absence of stakemarkers makes it difficult to visually confirm on-sitethat if the earthwork is to be completed exactly as
originally planned. Use of AR*２ technology allows
projecting the three-dimensional design image over
the actual view to facilitate earthwork quality
control operation.

HoloLens

Operator using a wearable device(HoloLens by Microsoft)*１ ICT-based earthwork: Earthwork technology where all theprocesses from surveying, design, on-site work, inspection through todelivery are implemented based on three-dimensional electronic data
*２ AR: Augmented Reality■ Features●Real-time data sharing
Operators and work supervisor with a wearable device can view
three-dimensional models and other electronic data in a safe, realtime manner without using hand-held tablets.

HoloLens●Efficiency improvement
AR technology is employed to virtually project the design data over
the actual view, enabling work management fully without using
physical stake markers.
●Productivity improvement
Use of this technology cuts the amount of work hours approximatelyby half in a U-shaped gutter installation project, greatly improving
productivity.
Installation with a wearable device

No stakemarkers
required《Conventional earthwork》《 ICT-assisted earthwork 》

・Place stake markers
・Work by referring to themarker positions
・Check the completed shapeaccording to the markers

・Create a three-dimensional
design data
・Work according to themonitor display
・Check the completed shapeusing AR

Difference between
conventional and ICT-assisted earthwork

OBAYASHI CORPORATION
https://www.obayashi.co.jp/en/

Projectedlines (top ofU-shapedgutter)

AR image overlay with a wearable device

Worker Safety Control System “Envital”
For centralized worker health management"Envital" ‫ﻧﻈﺎم إدارة اﻟﺴﻼﻣﺔ اﻟﺨﺎص ﺑﺎﻟﻌﻤﺎل‬‫اﻹدارة اﻟﻤﺮﻛﺰﻳﺔ ﻟﺤﺎﻟﺔ اﻟﻌﻤﺎل اﻟﺼﺤﯿﺔ‬■ Overview

Traditionally, worker health management against heatstroke has depended on taking WBGT*1 measurements and reminding
the workers to take liquid and salt frequently and to rest regularly, but the tendency to heatstroke differs greatly from person
to person and also depending on the work content and location of work being done. Envital is a centralized worker healthmanagement system that uses a combination of vital sensors and environmental sensors to measure each worker’s heart rate
and obtain the environmental heat index in a real time manner for individualized monitoring of each worker’s condition.
*1 Wet Bulb Globe Temperature： A heat index proposed in US in 1954 for heatstroke prevention

Cloud

Worker safety management system

Integrated alert system

Vital data(heart rate)

Smartphone

Wearablesensor/transmitter“hitoe®”Work supervisor

Mobilecommunication

Mobile communication

Electrocardiography/heartrate/
3-axis acceleration

Alert
Alert
Wristband-type
sensorEnvironmental
data(WBGT)

WorkerAlert

Heat Index Watcher■ Features●Individualized worker risk level monitoring
The heart rate from the wearable sensor and the WBGT
measurement obtained from the Heat Index WatcherTM*2 areuploaded to the cloud to monitor each worker’s heatstroke risklevel.

Work officeManagement screen (server)●Cloud-assisted centralized management
The controller can monitor and manage all the workers’ data
single-handed. Analysis of the collected data allows precise
determination of the heatstroke risk level, triggering an e-mailalert message to be sent to the controller whenever necessary.
●Compatibility with multiple platforms
The system is compatible with a wide range
of web-based platforms including mobile devices and PCs.
*2 Heat Index WatcherTM : :A WBGT monitoring device originally developed byObayashi. A proprietary wireless communication network allows centralized datamonitoring and management.

■ Implementation records

Control screen (terminal device)

The system was implemented in 23 work sites covering a
total of 462 workers, only one of whom was diagnosed withheatstroke. (This single failure case was a result of negligenceto follow the system implementation rules).

Heart ratemonitorOBAYASHI CORPORATION
https://www.obayashi.co.jp/en/

Condition
indicator

Alert
messageGCP-less UAV

For greater UAV measurement efficiency in earthwork projects‫طﺎﺋﺮات ﻣﺴﯿﺮة ﺑﺪون ﻧﻘﺎط ﻣﺮاﻗﺒﺔ أرﺿﯿﺔ‬‫ﺗﺤﺴﯿﻦ ﻋﻤﻠﯿﺎت ﻗﯿﺎس أﻋﻤﺎل اﻟﺤﻔﺮ اﻟﮫﻨﺪﺳﯿﺔ اﻟﺘﻲ ﺗﻘﻮم ﺑﮫﺎ اﻟﻄﺎﺋﺮات اﻟﻤﺴﯿﺮة‬■ Overview
UAV-assisted photograph measurement in earthwork projects has been an
extremely time-consuming work as numerous GCPs*1 have to be installed onthe ground.
Our “GCP-less UAV” is a UAV *2 technology that employs high-precision
positioning data to enable photograph measurement operation to becompleted without using ground GCPs.
The system mainly comprises a general-purpose UAV and a PPK*3
processing system and is ideal for speedy geometrical measurements of fills
and cuts in road construction projects.

GNSSUAV30~100mOperator*1 GCP: Ground Control Point
GCPs are reference points to be used for coordinate correction
as part of UAV-assisted photograph measurement operation.
To adequately evaluate a completed earthwork geometry, one GCP needs to be placed
every 100 m.
*2 UAV: Unmanned Aerial Vehicles*3 PPK: Post Processing Kinematics
PPK technology implements correction from the reference point
after independent positioning
Data processing requires the use of the “KLAUPPK” program supplied by Geolink Japan Co., Ltd.

Watcher
Overview of GCP-less UAV■ Features● Excellent measurement accuracy
Photograph measurement accuracy using the GCP-less UAV system isassured to be the actual measured position ±50 mm or finer*4 at avalidation point. The system sufficiently offers measurement accuracy
required for successful UAV-based management of finish shape.
● Productivity improvement
Unlike the conventional UAV-assisted photograph measurement using
GCPs, the GCP-less UAV technology does not need the installation andmeasurement of ground control points and thus realizes 30%
improvement in productivity.
● Greater safety
Elimination of on-site GCP installation and measurement tasks
contributes to greater worker safety.

Measurement operation using theGCP-less UAV system*4 The Ministry of Land, Infrastructure, Transport and Tourism specifies, in its “Aerial
Photograph-based (Unmanned Aircraft-assisted) Surveying for finish Shape Management”(Earthwork version), establish that the UAV-assisted photograph measurement accuracy
should be ±50 mm or less.

■ Application example

・Finish shape measurement in earthwork projectSpecial antenna

Correction
terminal
Aircraft for GCP-less UAVOBAYASHI CORPORATION
https://www.obayashi.co.jp/en/

Result of photograph measurement by GCP-less UAV

Steel Pipe-and-Concrete
Hybrid Structure
For speedy installation of bridge piers‫أﺳﻠﻮب ﻣﺨﺘﻠﻂ ﻳﺠﻤﻊ ﺑﯿﻦ أﻧﺎﺑﯿﺐ اﻟﺼﻠﺐ واﻟﺨﺮﺳﺎﻧﺔ‬‫اﻟﺒﻨﺎء اﻟﺴﺮﻳﻊ ﻟﺮﻛﺎﺋﺰ اﻟﺠﺴﻮر‬① Suitable for building high bridge piers: Hybrid SlipformMethod■ Overview
The Hybrid Slipform Method is a frame construction technique designed for making steel-pipe-andconcrete composite bridge piers. A highly rigid steel pipe structure is stood up first to support theoperational counterforce, and then the integrated formwork/scaffold unit is moved up and down along
the structure with a stabilized mechanism to construct the pier.
The Hybrid Slipform Method helps reduce workload in various pier construction tasks (steelreinforcement assembly, formwork handling, scaffold preparation) and greatly reduces the overall
construction work time.
Steel-pipe-and-concrete
composite bridge pier<<Recommended use>>
・30m or higher bridge piers, especially those located in mountainous or other difficult-to-work areas■ Features● Manpower saving
・The rigid truss-structure formwork unit does not require aseparator and therefore can be automatically lifted and loweredby a jack system.
・Steel PC strands, used in place of tie hoops, are mechanicallyinstalled by a self-travelling winder into a continuous spiral shape,significantly reducing steel reinforcement assembly workload.
・Elimination of intermediate tie hoops further reduces manpower
requirement.
● Speedy Construction
・The favorable characteristics of steel pipes and PC strands enable
the work time to be reduced by 20% compared to that of an
ordinary elevated formwork system.
・Steel pipes and reinforcements are assembled in one operation
through to the highest level, followed by a series of single-liftper-day concrete casting operations (single lift height of 1.8 to2.4 m).

Steel pipe andreinforcement assemblycompleted

Slipform system inoperation■ Installation records

Successfully employed for highway bridge pier construction projects,etc. (pier height of 30 m to 80 m)② Suitable for low bridge piers: Hybrid Honeycomb Method■ Overview
The steel-pipe-and-concrete composite pier system consists ofhollow-core hexagonal precast column components and steel pipes,
which are integrated to form individual column units. Use of precast
concrete components in bridge pier construction traditionally involved
operational concerns such as those concerning jointing between
components and lift-up weight. The present process solves theseconcerns by inserting and stacking hollow precast column
components around each steel pipe and jointing them in the height
direction at a regular interval.
The system offers bridge pier weight reduction, durability
improvement and speedy installation.
<<Recommended use>>
・Relatively low bridge piers of overhead bridges in urban areas

Steel pipe
S-C structure mainly
supported bysteel pipes

Connected
reinforcement
steelInter-column
connection steel

OBAYASHI CORPORATION
https://www.obayashi.co.jp/en/

Jointing of steel
pipes and precastcolumns
Precast column
Factory-fabricated,hollow-core
hexagonal
component

Structural concept drawing■ Features●Greater durability and earthquake resistance・Use of steel pipes improves shear strength and toughness.
・External protection by factory-fabricated precast column components●Quality improvement
・Easily installable and therefore not prone to work errors●Lightweight・The nearly shell-shaped cross section contributes to weight reduction●Manpower saving and speedy construction
・Significant manpower saving in steel reinforcement assembly andformwork handlingConcrete filling

Connected Steelcomponents

Connected steel
components

Steel-composite honeycomb structure

Deck Slab Replacement Technology
Slim FastenerFor speedy jointing of precast bridge deck slab components‫ﺗﻜﻨﻮﻟﻮﺟﯿﺎ اﺳﺘﺒﺪال أﻟﻮاح اﻷرﺿﯿﺎت ﺑﺎﺳﺘﺨﺪام أﺟﺰاء اﻟﺮﺑﻂ اﻟﻀﯿﻘﺔ‬‫اﻟﺘﻮﺻﯿﻞ اﻟﺴﺮﻳﻊ ﻷﻟﻮاح أرﺿﯿﺎت اﻟﺠﺴﻮر اﻟﻤﺴﺒﻘﺔ اﻟﺼﺐ‬■ Overview

This technique allows speedy jointing between precast deck slab
components in a bridge structure and is ideal for replacing the deckslab on old bridges. Our originally-developed mortar, “SLIM-Crete,”*reduces the jointing width to approximately half that of conventional
jointing technique and also eliminates the need for on-site steel
reinforcement assembly work, which significantly shortens the overall
work time.
Another advantage is that absence of steel reinforcement joints andother obstructing features makes the structure free from deck slab
thickness restriction, allowing greater flexibility and economy in deckslab design.
Jointing
betweencomponents

Filling using “SLIM-Crete”
Steel reinforcementin bridge axis
direction

PCa deckslab

Precast deck slab jointing

Multiple shear
keys

S lim

Faste

ner

Main steel
girderSlim Fastener concept

Conventional jointing method (W»400 mm）

Slim Fastener（W»200 mm）*UHPFRC (SLIM-Crete) with Compressive Strength of 180 MPa by Ambient Temperature Curing
Its main ingredients include cement-based special powder and ultra-high-strength steel fiber.
The product achieves a compression strength of 180 MPa greater can be achieved without special curing and is suitable forboth cast-in-place and onsite precast installation. With the superb fluidity, the product self-fills the tightest corners of theformwork (post-cast compaction is unnecessary).
The product is designed for more than 100 years of durability against neutralization and salt damages and is about eight times
as wear-resistant as an ordinary concrete mix.
<<Recommended applications>>
・Jointing between precast deck slab of bridges (for installation of new floor base or replacement of existing ones)■ Features●Work time reduction

・The shortened jointing width of approximately 200 mm and theelimination of transverse steel reinforcement greatly reduce theoverall work time.

● Lower maintenance and management cost

・ The joint cross section consisting of multiple shear keys
increases the shear strength and adhesion of the joint, effectively
reducing gap-opening and cracking risks and consequently
alleviating maintenance and management workload.

■ Installation record

SLIM-Crete application

Road bridge deck slab replacement project:・Existing deck slab was removed and a new deck slab was installed and jointed over a section of approximately 150 m. The
overall work time was about 30% shorter than that by a conventional construction method (conventional 20 days ⇒ shortened
to 14 days).

OBAYASHI CORPORATION
https://www.obayashi.co.jp/en/Image Analysis-based
Automatic Crack Detection
AI-assisted speedy infrastructure inspection‫ﺗﻜﻨﻮﻟﻮﺟﯿﺎ اﻟﻜﺸﻒ اﻟﺘﻠﻘﺎﺋﻲ ﻋﻦ اﻟﺘﺸﻘﻘﺎت ﻋﻦ طﺮﻳﻖ ﺗﺤﻠﯿﻞ اﻟﺼﻮر‬‫ﻓﺤﺺ اﻟﺒﻨﯿﺔ اﻟﺘﺤﺘﯿﺔ اﻟﺴﺮﻳﻊ ﺑﺎﺳﺘﺨﺪام اﻟﺬﻛﺎء اﻻﺻﻄﻨﺎﻋﻲ‬■ Overview
Images of a concrete structure recorded by a special high-performance camera are processed by an AI-assisted image
analysis system to automatically and speedily detect concrete surface cracks, accurately determining the width and length ofeach crack.
The system is designed to allow the recorded data to be easily stored and managed, contributing to manpower reduction in
concrete structure maintenance and management operations.
<<Recommended applications>>
Concrete structures (box culverts, bridges, tunnel lining, etc.)

Crack detection example■ Features●Automatic conversion into electronic data

・ Automatically detects concrete surface cracks from recorded
images and determines the crack position, width and length.
・The crack detection result can be stored as a CAD data (DXFformat).
・Multiple photographs can be automatically stitched to create anexpanded image.

● Greater inspection operation efficiency

・On-site work involves crack photographing only.
・No large-scape equipment such as an inspection scaffold or
aerial platform is required, which potentially reduces
inspection cost.
・Use of a special high-performance camera enables
photographs to be taken over a long distance (approx. 50 m).
・The required number of shots can be reduced to about 1/6of that by a common SLR camera (20 million pixels),further reducing labor cost.
・The system is designed to facilitate comparison with past
inspection results.

Example of image analysis result output(DXF format)● Enables inspection in dark places

・ Images can be recorded with existing work light only evenin dark places such as the inside of a tunnel.

Photographing concrete tunnel lining■ Application records
Have been successfully applied to concrete tunnel lining inspection.
＊Image analysis requires the use of “Infrastructure Photo Analysis Cloud Service” supplied by Fujifilm Corporation.

OBAYASHI CORPORATION
https://www.obayashi.co.jp/en/

High Durable Concrete with Seawater
Useful for post-disaster restoration or infrastructure projects on aremote island or in other locations where freshwater is hard to come‫ﺧﺮﺳﺎﻧﺔ ذات ﻣﺘﺎﻧﺔ ﻋﺎﻟﯿﺔ ﻣﺨﻠﻮطﺔ ﺑﻤﺎء اﻟﺒﺤﺮ‬‫ﻟﻼﺳﺘﺨﺪام ﻓﻲ إﻧﺸﺎءات اﻟﺠﺰر اﻟﻨﺎﺋﯿﺔ وﻣﻨﺎطﻖ اﻟﺘﻌﺎﻓﻲ ﻣﻦ‬‫اﻟﻜﻮارث واﻟﻤﻨﺎطﻖ اﻟﺘﻲ ﻳﺼﻌﺐ ﺗﺄﻣﯿﻦ اﻟﻤﺎء اﻟﻌﺬب ﻓﯿﮫﺎ‬■ Overview

This product is designed to be mixed with seawater and uses industrial
byproducts (blast furnace slags, fly ash, etc.) and special additives so thatstrength starts to develop in early stages and will be sustained over along period of time.
The unique product composition also contributes to quality
enhancement such as greater durability and water blocking effect.
Furthermore, unwashed sea sand can be mixed into the product.
With the use of non-corrosive reinforcement, the product can be used
for making steel-reinforced concrete structures.
Manufacturing and installation processes are identical to those ofcommon freshwater-mixed concrete product.
This is a first-of-the-world technology developed in andoriginating from Japan.
<<Recommended applications>>
・Structural construction on remote islands or dry climate areas wherefreshwater is hard to come by・Construction work after a natural disaster or in other situations
where freshwater is hard to come by・Structures to be build around rivers, ports and along pavements
where both initial and long-term strength is critical・Structures such as those in a radioactive industrial waste facility
where superior water blocking functionality is required Wavedissipating block fabrication as part of post-disaster restoration
effortWave-dissipating block fabrication as partof post-disaster restoration effort(Soma Port, Fukushima Prefecture)■ Features●Greater strength

・When blast furnace cement is used, the compression strength isapproximately 60% better than that of freshwater-mixed concrete.
・Strength starts to develop in early stages.

Penetration
depth

Penetration
depth●Greater water blocking effect・Use of seawater causes the microstructure to be denser thanwith freshwater mixing, decreasing the water permeation
coefficient to approximately 1/70 of freshwater-mixed productand thus achieving greater water blocking effect.

●Steel reinforcement corrosion control

Freshwater-mixed

Seawater-mixed

Water permeation test result(water pressure 1.0 MPa for 48 hrs)

・Use of non-corrosive reinforcement component enables thestructure to be designed in the same way as common steelreinforced concrete.
・With the use of epoxy resin-coated reinforcement, a design service
life of 100 years is assured.
・With the use of stainless steel or carbon fiber rod reinforcement, adesign service life of over 100 years is assured.

●Cost reduction

Epoxy-coatedsteel（ａ）エポキシ樹脂塗装（ａ）エポキシ樹脂塗装
reinforcement : No corrosion
・Use of locally procurable ingredients (seawater and sea sand) makes
detectedmaterial cost reduction possible.

●CO2 emission reduction

Carbonfiber rod（ｂ）炭素繊維ロッド（ｂ）炭素繊維ロッド
reinforcement:
No corrosion
detected

Accelerated corrosion test result withdifferent reinforcement materials

・Use of industrial byproducts and locally procured material can
reduce CO2 emission in the manufacturing process by 50%.

(No corrosion detected after an accelerated corrosion stressequivalent to a natural exposure of 100 years is applied)■ Application records

Pavement using blast furnace slags

OBAYASHI CORPORATION
https://www.obayashi.co.jp/en/

Prepacked concrete block using
concrete debris

Revetment block for seaportprotection

Next-generation Automatic Quality
Inspection SystemBIM-assisted speedy steel reinforcement inspection‫ﻧﻈﺎم اﻟﺠﯿﻞ اﻟﻘﺎدم ﻟﻔﺤﺺ اﻟﺠﻮدة اﻟﺘﻠﻘﺎﺋﻲ‬(BIM) ‫ﺗﺴﺮﻳﻊ ﻋﻤﻠﯿﺎت ﻓﺤﺺ ﺗﺴﻠﯿﺢ اﻷﺑﻨﯿﺔ ﺑﺎﺳﺘﺨﺪام ﻧﻤﺬﺟﺔ ﻣﻌﻠﻮﻣﺎت اﻟﺒﻨﺎء‬■ Overview

All concrete structure construction works require theinspection of steel reinforcement, we must make sure that thatnumerous reinforcement bars are assembled in correct
quantity and spacing (pitch) and that the diameter, length andmaterial type of each bar is as instructed in the design
drawing. However, it is difficult to clearly indicate thearrangement of all reinforcement bars on two-dimensional
design drawings. It therefore used to take long experience tobe able to conduct drawing-based steel reinforcement
inspection.
This solution is an automatic quality control assistancesystem assisted with image recognition technology, threedimensional data capability, BIM and mixed reality.
Comparison of the three-dimensional image shown on atablet and the actually-assembled reinforcement immediately
makes it clear if the steel reinforcement is assembled exactly
to the design drawing, minimizing human error risks andsignificantly reducing inspection time.

Wearable system device in use■ Features●Precision positioning

Use of composite sensor capability enables precisionindoor positioning without the use of GPS or Wi-Fi●Automatic measurement

Number of reinforcement bars, diameter andspacing can be automatically obtained from realtime three-dimensional data

Threedimensional dataof thesurrounding

Own position

Track●Productivity improvement

BIM model comparison based on three-dimensional
measurement result can expedite the steel
reinforcement inspection operation, cutting theoverall inspection time approximately by half.
Indoor positioning result

Checking the overlaid image of BIM modeland actually-assembled reinforcement bars
on a tablet■ Application records

Measuring spacing between
reinforcement bars

This system can be used for inspection in various reinforced concrete structures.

OBAYASHI CORPORATION
https://www.obayashi.co.jp/en/