The Robot AwardFirst Prize (Social Infrastructure,Disaster Response, Fire Fighting Category)

A4CSEL® (quad-accel)

The next-generation construction production
system with automatic operationof construction machinery at its core

A4CSEL development concept

A4CSEL configuration

Kajima Corporation

Turning civil engineeringsites into state-of-the-art factories
In-use on site (embankment dam, 2018)■Outline of A4CSEL

The A 4 CSEL (Automated/Autonomous/Advanced/Accelerated
Construction for Safety, Efficiency, and Liability) was developed tosolve important issues in the construction industry such as theshortage of labor and skilled workers, construction productivity, andindustrial accidents. It is a construction like none other, that
automates general-purpose construction machines, and allows
multiple machines to operate automatically at the same time toperform work without the need for a lot of manpower. By sending
work data, the automated construction machines can performroutine and repetitive tasks automatically and unattended. By
operating a large number of machines simultaneously and with aminimum of personnel, productivity and safety can be greatlyimproved. The A4CSEL consists of the following: 1. Technology tomodify general-purpose construction machinery to automatic
operation specifications. 2. Technology to ensure stable quality
work regardless of site conditions by incorporating AI-analyzed
data of skilled workers into the automatic operation control. 3.
Construction management technology that coordinates a large
number of machines and operates them based on the mostproductive construction plan. These technologies make itpossible for all machines to operate autonomously andautomatically based on a plan that optimizes the placement ofconstruction machines and the order of work. The automation of thethree main types of construction equipment used for earthwork,
namely vibratory rollers, bulldozers, and dump trucks and theautomation of the work performed by these machines has madeprogress and has been implemented at four sites so far.

■From labor-intensive to information-intensive

In many construction sites, each job is left up to the worker, and as
a result, the efficiency has been left up to individual skills that aredifficult to quantify. In order to change such qualitative and highlyvariable production efficiency into stable quantitative values,
A4CSEL analyzes the onsite work, including the work that requires
experience and skill, and reconstructs and standardizes it into a
combination of routine and repetitive actions. The company is alsobuilding a highly productive construction production system byimplementing methods of optimizing the production process thathas been cultivated in manufacturing plants. Through these efforts,
the company is transforming construction sites, which areconsidered to be typical of labor-intensive industries, intoproduction bases for knowledge- and information-intensiveindustry.

A4CSEL at work (@CSG Dam 2020)

Developing the system at the life-size construction test site

■Future Prospects

At the life-size construction test site, the first of its kind in theindustry, modification to automatic operation specifications,improvement of automatic operation performance, and the study ofconstruction methods suitable for automatic operation arecontinuously being carried out under the same working
environment as a real site. The company plans to continue toincrease the number of automated machine models and expand
the technology to other types of construction work, using A4CSEL
to dramatically improve productivity and safety while also achieving
the factorization of civil engineering sites.

Contact:Kajima Corporation
2-19-1 Tobitakyu, Chofu, Tokyo
Satoru Miura, Technical Research Institute Tel: 042-485-1111 E-mail: miuras@kajima.com
THE 9TH ROBOT AWARD

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