Hello, everyone
This is Enta.
Do you know how much the operating costs for a drilling machine are?
This is actually about the machinery used by our subcontractors, lol.
When I was working at a branch office, I didn't really think about things like that very much.
Well, I've never bought one, and I've never worked on one either.
Well, there's no way I could know that, is there?
I’d like to think about that a little bit this time.
Since the price of drilling machines is rising rapidly right now, it’s inevitable that equipment costs will go up in the future.
In the past, 2-metric-ton-class drilling rigs cost less than 20 million yen.
Depending on the manufacturer, it currently costs around 25 million yen.
It depends on the options, though.
Let's consider a 2-metric-ton-class drilling rig.
Depreciation of basic machinery is calculated based on taxes and the machinery's useful life.
In the case of rotary percussion (depending on the company's policy), we generally consider a lifespan of about 7 years.
Depreciation period: 7 years
25 million ÷ 7 years = 3.57 million per year (straight-line method)
This is the amount you can claim as an expense in a single year.
Also, let’s assume the repayment period for a bank loan is the same. (7-year loan or lease)
Let's assume this is the minimum amount you want to earn in a year.
3.57 million ÷ 12 months = 297,500 yen per month
Assuming there are 20 working days in a month,
297,500 yen ÷ 20 days = 14,875 yen per day ≈ 15,000 yen
This is the minimum cost associated with using a drilling machine.
And you can't drill a hole with just this.
Drilling machines require tools that correspond to the drilling diameter.
These include threaded chuck pieces and center risers.
Plus, everything in this set is a consumable!
Depending on the drilling diameter, the tools for the tip—such as the chuck piece—cost about 100,000 yen (in total).
I think it's safe to assume that this will be used up in one month, so
100,000 yen/month ÷ 20 days = 5,000 yen/day
Next, a swivel set costs around 350,000 (or 1 million or more for bore diameters of 135 or larger).
Assuming 6 months of use,
350,000 yen ÷ 6 months = 58,000 yen/month ÷ 20 days = 2,900 yen/day
You'll need the inner and outer casing set, too, right?
Of course, this is a consumable item, too!
Depending on the mountain conditions, even brand-new gear can wear out quickly.
What is the price of the casing for a 20-meter borehole with a borehole diameter of φ90?
At about 900,000, assuming you use it for, say, six months,
900,000 yen ÷ (20 days × 6 months) = 7,500 yen per day
7,500 yen × 20 days = 150,000 yen/month
This is an important point.
The bit we use most often is the double-conical bit.
There are differences depending on whether the mountain is rugged or gentle, but
Let's say we're using a set consisting of two φ90 outer bits and one inner bit.
Bit: 70,000 yen ÷ 20 days = 3,500 yen
And finally, fuel, lol.
Let's assume we use about 120 liters per day.
Since diesel has been expensive lately, I'll set it at 150 yen.
120 L × 150 yen = 18,000 yen
Per day
Drill Unit: 15,000 yen
Tools: 5,000 yen
Swivel: 2,900 yen
Case: 7,500 yen (inner and outer set)
Bit: 3,500 yen
Fuel: 18,000 yen
－－－－－－－－－－－
Total: 51,900 yen
This is the minimum requirement. (If everything is new)
So, that means these are the minimum daily costs, right?
In reality, since we can reuse some components, I feel like we could probably manage even with 70% or higher, but
Expense ratios and purchase prices vary by company.
This is the anchor shop, lol.
Sure, there are some workplaces where consumables don't wear out as quickly as you'd expect, but,
It's pretty much the same throughout the year.
Besides, there are more than just these anchor shops, right?
Since we also have mixers, pumps, injection hoses, and other equipment,
This means that, all things considered, machine costs amount to around 70,000 yen per day (70% or more).
The unit price is calculated based on labor costs, machinery costs, and other expenses—is that unit price appropriate?
But over the past few years, machine prices have been skyrocketing, and things have gotten completely out of hand.
Contractors are coming up with all sorts of creative ways to save money on construction!
If we keep lowering the construction unit price, there’s a very real possibility that we’ll run out of contractors.
Even now, there's a labor shortage, the number of contractors is declining, and there are plenty of elderly anchor crews!!
Raise the construction unit price and drastically increase the salaries of young workers at construction companies (though that depends on the management, lol),
I’d like to make our slope maintenance company an attractive place to work—both in terms of pay and job opportunities—by raising the salaries of our technical interns!
See you later
What exactly is a fair price for subcontractors in public works projects?
