Case studies of Advanced Construction and Demolition waste(CD W)
Recycling initiatives and technologies In JAPANAffiliation
Location
Position :Name/Surname
e-mailTitle
The meclassification

OKUNOKOTOH Co. ,Ltd
1-14-13,Otukacho,Takatsu ki-sh i,Osaka 569-0034 Japan
Vice president
HIROZO OKUNO
hz.okuno@okunokotoh.jp
OKUNOKOTOH Soil improvement technolog y〇 Prevention
Re-use〇Technology
developme nt sta ge
Specific conte nt

RecycleReduce Co2
LegacyBusiness to overseas

Etc.
〇 Practical use
Scheduled to be put into practical use by 2020
Scheduled to be put into practical use af ter 2020
- This technology combines excavated soil of different soil properties
with low-appearance excavated soil, which cannot be used as it is, andmixes them by stirring to adjust the particle size and improve thestrength, thereby producing high-quality soil materials.
- It is also possible to add additives at the same time, and it can be
improved to the required quality soil material at low cost andaccording to the application to be used.

Facility configuration:
Sedimen t hopper, lightweigh t conveyor, input conveyor,
universal so il improvement machine,discharge conveyor (solidif yin g mater ial hopper)
Application lo cation:
River embankment fillin g mater ial
Roadbed / road floor filling mater ial,
backfill mater ial,
land section building

Appeal point- Recycling of low-quality excavated soil and contribution to a Sound
Material-Cycle Society.
- Continuous construction and productivity improvement throughmechanization of soil mixing.
- System technology based on computerization of mixed operation
management.

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OKUNOKOTOH

Soil improvement technology

The universal soil improving system for construction surplus soil
The universal soil improving system revives
construction surplus soil to quality soil, by
evenly stirring soil to improve grain size, aswell as by adding hardening agents.
With four mixing chambers, it repeats
shearing, moving, diffusing and mixing,
which can accommodate various size andtypes of soil and clay. This system also
works brilliantly for soil improvement ofsludge.

System scheme

Control by weight measuring
Automatic control from the operation room

4-axis serial mixing method

4-axis serial mixing method-89-Construction example
Sandy soilCohesive soil

Gravelly soil

622

Water content（％）

13.5

38.2

2.2

Gravel（％）

16.7

0.0

80.6

Sand（％）

62.0

8.7

13.0

Fine-fraction（％）

21.3

91.3

6.4

5753

230

Classification

Preliminary laboratory test

Preliminary soil test data and grain size distribution

Cone index (kN/m2）

Class 1 constructionsurplus soil Class

Soil classification

Class 4 constructionsurplus soil Class－□－ Sandy soil－△－ Cohesive soil－○－ Gravelly soil―
Class 1 constructionsurplus soil Class

Post-mixing soil test data and grain size distribution
Mixed soilDaily data

Water content（％）

14.8

14.6

Gravel（％）

27.2

29.6

Sand（％）

44.3

48.3

Fine-fraction（％）

28.5

22.1

3277

1800

Class 2 construction-surplus
soil ClassClass 2 construction-surplus
soil ClassClassificationlaboratory test

Laboratory estimated data

Cone index (kN/m2）
Soil classification－□－ Estimated data－△－ Daily data

Case: Recycling of construction surplus soil into mound soil for banks

Super bank construction

Bank reinforcement construction
Conventional banks are built up simply by banking soil; therefore, it may burst when the bank is in a wetcondition with water penetrating it, or the bank surface is scoured.
It is called bank reinforcement to strengthen the conventional bank strength ageinst bursting.
A gentle slope bank is build up by widening the bankcross-section.Increasing the bank cross-section
makes a stable bank that is strong against floods.
This method is used for draining quickly the water
penetrated in the bank to lower the water level, byreplacing soil around the toe of the slope on theriver-back side (residence side) with permeable
materials, such as stones.
p ;ap
point where an area pprotected*Toe of the slope;by levee or a major bed.

Toe of the slope
Sheet pile-90-Example of system setup (Case of three-kind soils)※An arrangement is possible according to the situation of the site.

Soil A for
mixtureSoil Hopper(A)Operation
room

Generators

A injection
conveyer

A measurement
conveyer(A)Soil mixer

A discharge
conveyer

Mixtureimprovement
soil

Soil testingroom

A measurement
conveyer(C)A measurement
conveyer(B)Soil Hopper(C)Soil Hopper(B)Soil B for
mixtureSoil C for
mixtureCross-section A-A

Specification of system
Standard specification
Equipment nameSoil Hopper ※（With scooping-out device）
A measurement conveyer ※（With measurement device）
A injection conveyer
Soil mixer
A discharge conveyer
Operation room
Generators

Capacity of motor：
Capacity of soil hopper：
Capacity of motor：
Size of belt：
Capacity of motor：
Size of belt：
Capacity of motor：
Size of mixing axis：
Capacity of motor：
Size of belt：
4500×2000×H2390m
250kVA

Technical standard
7.5kw
2㎥
7.5kw
750㎜ width × 10m （Distance between axes）
5.5kw
750㎜ width × 7m （Distance between axes）
22kw×41mφ×1m width（Per axis）
7.5kw
750㎜ width × 10m (Distance between axes）

Intended purpose
Soil slot
Carrying out soil measured
Transporting soil measured
MeasuringTransportation halfway
Mixing soils
Carrying out soil mixed
System control
Power※The number of the soil hoppers and the measurement conveyers changes depending on the number of soils mixed.
The case of three kinds of soils: 3 devices
The case of two kinds of soils: 2 devices

Head office :1-14-13,Otukacho,Takatsuki-shi,Osaka 569-0034
Phone: 072-675-0388 Fax: 072-671-9565

Hyogo office :487,Babasaki,Higashi-honjo,Sanda-shi,Hyogo 669-1357
Phone: 079-568-6375 Fax: 079-568-6378

Kanto office :1078-1,Kamikocho,Omiya-ku,Saitama-shi,Saitama 330-0855
Phone: 048-780-2049 Fax: 048-643-2058

OKUNOKOTOH CoCo., LTD
LTD.
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