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Yamamoto 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 Hydraulic Rock Splitter

Yamamoto Ultra Large Rock Splitter has been developed and refined over the past 30 years to provide superior quality and maximum output. Key features include:


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.


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.


All components are designed with large safety margins and precise finishing allowing the splitter to run trouble free for a long time. Many customers can use the splitter for a year without any service or repairs.

How does Yamamoto Rock Splitter work?

The working principle of Yamamoto rock splitter is based on two counter wedges inserted in a pre-drilled hole. A hydraulic cylinder pushes out a centre wedge between the counter wedges to spread them apart and the rock is forced to crack.

1st Step:

Insert half of the total length of wedge and operate the Yamamoto splitter to split.

2nd Step:

Then insert about ¾ of the total length of the wedge to split again.

3rd Step:

Finally, insert the total length of the wedge and split to complete.

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 22MN (2,250 ton) 34MN (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
Splitter length (B) 3,000 mm 4,300 mm
Cylinder length (C) 1,850 mm 2,450 mm
Hydraulic pressure (min/max) 350/500 bar 350/500 bar
Excavator Weight (Tons) 12+ 20+
Standard split hole spacing 500 x 500 mm 700 x 700 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 standard excavator to turn it into a splitting machine

Fast and accurate insertion of wedge with telescopic arm

Side-angling for covering the full face without repositioning the undercarriage

Integrated rotator with 360 degree rotation