Yamamoto Brochure ENG Rev

L I C
A U K
D R O C
H Y R E R
I T T
P L
S
WHAT IS YAMAMOTO HYDRAULIC ROCK SPLITTER?
The use of explosives are the most common methods for excavation of hard rock. However,
restrictions on blasting are increasingly strict and requires permits and inspections. In densely
populated or otherwise sensitive areas, blasting may be completely banned due to concerns
about vibrations, flyrock or other safety aspects.
Yamamoto Hydraulic Rock Splitter was designed as a mean to excavate hard rock without any
concerns for vibrations, flyrock or noise. The method is based on the traditional wedge and feather
method but is using hydraulic power to split the rock instead of impact force.
The splitter is normally mounted on a normal excavator and uses

the hydraulic power of the carrier. But it can easily be used on a
crane or tailor made carrier, all depends on the type of project. The
simple installation method allows it to be moved from carrier to
carrier without any major modifications so the same splitter can
be used in many different types of project.
For large volume rock excavation, in hard

rock, there is simply no mechanical method
more efficient, safe and quiet than Yamamoto
Hydraulic Rock Splitter. This is the reason it
has been used in worldwide in some of the
most challenging and important construction
projects.
Advantages of Yamamoto How does Yamamoto

Hydraulic Rock Splitter Rock Splitter work?
Yamamoto Ultra Large Rock Splitter has been The working principle of Yamamoto rock splitter is based on
two counter wedges inserted in a pre-drilled hole. A hydraulic
developed and refined over the past 30 years to
cylinder pushes out a centre wedge between the counter
provide superior quality and maximum output. wedges to spread them apart and the rock is forced to crack.
Key features include:
PRODUCTIVITY
With the largest splitter on the
market, it also offers the highest
productivity. With larger wedge you
can increase the spacing between
holes and do deeper with each split.
ROBUSTNESS
The Yamamoto rock splitter is
designed with minimal number of
parts, utilising the pressure of the
excavator to avoid boosters, and
manual greasing to allow for greasing
all the way out to the tip of the
wedges, there is nothing that can fail.
DURABILITY
All components are designed with 1st Step: 2nd Step: 3rd Step:
large safety margins and precise
finishing allowing the splitter to run Insert half of the Then insert about Finally, insert the total
trouble free for a long time. Many total length of ¾ of the total length of the wedge
customers can use the splitter for a wedge and operate length of the wedge and split to complete.
year without any service or repairs. the Yamamoto to split again.
splitter to split.
TECHNICAL SPECIFICATIONS
Model HRB-1000 HRB-1700

Weight 650 kg 1,500 kg
Drill hole diameter* Ø 102 mm Ø 127 mm
Drill hole depth 1,500 mm 2,500 mm
Splitting force 22 MN (2,250 ton) 34 MN (3,550 ton)
Splitting distance 25 mm 30 mm
Wedge diameter Ø95 mm to 110 mm Ø120 mm to 160 mm
Wedge length (A) 1,150 mm 1,850 mm
Wedge length (B) 3,000 mm 4,300 mm
Wedge length (C) 1,850 mm 2,450 mm
Hydraulic pressure (min/max) 320/500 bar 320/500 bar
Split hole spacing 500-700 mm 700-1,000 mm
* Also available for 76 mm drill hole diameter
YTB-1120 Arm-system
Total solution for horizontal application
YTB-1120 Arm-system is a
complete solution for using
HRB-1000 in a tunneling
application. The arm-system
incorporates a telescopic
boom with side-angling for
easy insertion of the wedge
without having to move the
undercarriage. Between there
telescopic boom there is a
rotator for controlling the
splitting direction.
Can be mounted on any Fast and accurate Side-angling for Integrated rotator
standard excavator to insertion of wedge covering the full face with 360 degree
turn it into a splitting with telescopic arm without repositioning rotation
machine the undercarriage
WORK PROCESS - VERTICAL APPLICATIONS
Drilling
Drill the holes of Ø102mm X 1.5m depth for
Yamamoto HRB-1000 splitter, or Ø127mm X
2.5m depth for HRB-1700 splitter using a large
size hydraulic crawler drill or jumbo drill rig. We
recommend drilling in a staggered pattern with
500 - 700mm of spacing between holes for the
HRB-1000 and 700 - 1000mm for the HRB-1700,
as illustrated in the diagram.
Splitting
Insert the wedge into the hole and split the rock. Position the wedge so that it is splitting
towards the free face. To maximise the splitter’s productivity, it is very important that the
splitter is splitting towards a free face.
Secondary breaking and mucking

Break the already split rock into
smaller pieces and remove it
with a conventional excavator
with a rock breaker. Removing
the broken rock will keep the
free face close to where the
splitter is working. Secondary
breaking and splitting can be
conducted simultaneously.
Remove the muck using a

hydraulic excavator, wheel
loader or similar machine.
WORK PROCESS - HORIZONTAL APPLICATIONS
Drilling
Create a free face by drilling slots in the centre, bottom or periphery. Then drill split
holes for the Yamamoto Splitter between the slots. Proper slot drilling involves drilling
overlapping holes as bridges between the holes to allow the rock to maintain its structural
integrity. A special attachment on the jumbo boom may be required for slot drilling.
The photo and drawing below exemplify some recommended drilling patterns.
Splitting
Use a splitter mounted on a
customised carrier equipped with
telescopic boom and rotator. Start
splitting the holes closest to the free
face and aim at working from the
bottom and up to allow support from
gravity. Split in three steps by first
inserting half of the total length of the
wedge and split, then ¾ of the total
length and split and finally the full
length of the splitter.
Secondary breaking and mucking

Break out the cracked rock into smaller pieces using a hydraulic breaker mounted on a
conventional excavator. Work along the cracks caused by the Yamamoto Splitter. Use a
muckling method that suits each project, typically done with a standard excavator.
Use a muckling method that suits each project, typically done with a standard excavator.
ABOUT YAMAMOTO ROCK SPLITTER
The history of Yamamoto Rock Splitter started back in 1915 when the late Mr. Shuichi Yamamoto
first started manufacturing spare parts for rock drills in the mountain village of Tojo in Central
Japan. Over the years manufacturing expanded into rock drills, pneumatic drifters and hydraulic
drifters. The drifters are supplied on a private label basis to reputed rock drill manufacturers such
as Atlas Copco and Ingersoll Rand.
The first excavator mounted hydraulic rock splitter was supplied in 1981. Since then, we have
supplied over 200 splitters worldwide. In 2010, a new International Sales and Logistics office was
set up in Singapore to facilitate stocking and the delivery of splitter and spare parts. To better
support European companies, a new center was established in the UK in 2016.
Even today, all manufacturing and product development still takes place in the original factory
in Tojo, Japan. This allows us to maintain strict quality control and to build upon the 100 years of
experience in manufacturing quality products.
CONTACT US
International sales and distribution Your local dealer / distributor:
Yamamoto Rock Splitter International
320 Garratt Lane, London
SW18 4EJ, United Kingdom
Phone: +44 20 3637 6430
Fax: +44 20 3603 5580
Email: info@yamamotorocksplitter.com
Factory
Yamamoto Rock Machine Co., Ltd.
424-1 Kawanishi, Tojo-Shobara,
Hiroshima-Pref. 729-5125, Japan
Phone: +81 8477 22137
Fax: +81 8477 22140
www.yamamotorocksplitter.com

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L I C

The splitter is normally mounted on a normal excavator and uses

For large volume rock excavation, in hard

Advantages of Yamamoto How does Yamamoto

Model HRB-1000 HRB-1700

* Also available for 76 mm drill hole diameter

Secondary breaking and mucking

Remove the muck using a

Secondary breaking and mucking

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