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| Manual Piston Rock Splitting is Prevailing in many places. You can upgrade this job by mechanical tools |
Upper Heading part has been cleared and lower bench part remains after drilling.
Hard rock , Korean granite , drilling 95mm diameter holes
Splitting cylinder of 85mm diameters are used for splitting with the space of 40cm
between the holes. Drilling takes longer time than splitting.
One drill makes holes of 3 meter long at a time.
A splitting cylinder cracks the holes a meter deep inside the hole.
The splitter is used in 6 holes at a time. they crack the holes one meter deep.
Some suggestions are made here for a professional contractor;
1. Draw a drill plan in advance of drilling on the wall with some color paint.
This paited pattern makes the rock drill operator work much easier and faster.
2. Make use of the 'free face" in the wall. We always recommend to make free face
prior to any other drilling. A free face is the essential void without which splitting takes too long time. See details of free face from other blogs in this site.
Drilling for free face : the spacing between hole is very near
You can split the holes easily by directing the breaking force
toward the center hole.
After the breaking 6 surrounding holes, one large void is made.
This void is used as free face for splitting toward this void.
When you have a free face in one place, for.eg , one meter below center top ceiling. you can split the wall against those free faces.
3. Use a light but powerful splitter like SR 9507 ( 95mm diameter with 7 piston cylinder). Recommended spacing in the beginning is 500mm between hole centers. Weaker splitters cannot copy good sturdy splitters. Our SR 9507 is light as 29 kgs each. Our competitor splitters are very heavy like 37~39kgs,
4. We recommend to use our special handle for inserting deeper in the same holes. You need to ask more details when needed.
The tunnel upper heading was through now. This is for building the subway train.
Our splitting machine is seen ( yellow painted case). It has 6 cylinders connected to
a power pack run by an electric motor.
This tunnel was made by a fleet of equipment< one drill + one piston splitter
and an excavator and a truck> . We have some suggestion to the contractor.
Most of the contractors have their own confidence regardless of our opinion
for their easier performance.
We recommend our customers on the hard rock tunneling;
1) Study how to drill for free surface in the initial drilling.
2) Then begin to make free surface from top part and
middle parts from top to down.
3) Start the space based on 50cm space with 95 cylinder
or 85 mm cylinder with 40 cm space for hard rock
like granite.
4) If you use 85mm cylinder for harder rock , the drill space
is closer than 50cm.
Getting free surface takes more time than normal rock removal 3~4 times.Once you get free surface, then the rock removal proceeds faster.
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| Drilled wall view from a far place
It would be better for the contractor to have a 'Planned Profile' before start drilling. Then you make marked spots on the wall for easier drilling. This kind "planned profile" makes job easy and fast.
Also you will have some suggestions on many things: Can we use mechanical assistance like winch ( balancer) See below balancer photos.
This balancer would make the lifting work much easier than without it. This lift is useful for vertical splitting work sites.
  
Edilgrappa is suggesting A balancer tool as above.( See more at edilgrappa.com)
Following work site is from one of our customers in USA. He used D& S technology for making ponds in the rocky place.
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| Bench Bed Demolition after drilling |
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| Bench Demolition -closer look |
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More Closer look after Drilling
1. Take into consideration of the size of the tunnel! A larger size tunnel needs different types of tools and equipment. If the tunnel length is more than 500m, we suggest to use 3 boom drill instead of 2 boom or one rock drill. If you are working for wall face over 50 m2 , we recommend you the 3 boom rock drill. Also we may suggest a different type of rock drill than universal type available from a local contractor or rental house.
Slot drilling is called by Japanese people as ASB method( Anti-Spin-Bore method) This ASb was used for wedge splitters and early rubber pouch type splitters.
For the hydraulic piston rock splitting, we recommend the free face mentioned in top part.
2. Consider the performance you expect from the rock splitting. Selection of rock splitter decides spacing, depth,and splitting direction. Please refer to two drill patterns as below:  
Above drill pans are based on different size splitters. Plan 1 is made for rock splitter of 90mm diameter.
The spacing between bore holes is 500mm. Plan 2 is made for rock splitter of 110mm diameter. The spacing between bore holes is 750mm.
In consequence of this selection, the work load of drill/split is quite different. Plan requires 650holes to be drilled. Plan 2 requires 350 holes to be bored. Whcih one makes the work faster?
Above drill plan is for the tunnel size of 10meter wide, 10meter high. You can see the boundary line and paralleled free face drills. In the center vertical close drills are made. One line is made horizontally drilled. next holes are slanted for easy free face .
One evident advantage of piston rcok splitting against the wedge splitting is the fast performance. I ask our readers to compare the technology between piston and wedge splitting carefully. Then you will be able to find many merits of piston splitter over wedge splitter technology.
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