{"id":54148,"date":"2025-03-30T08:00:43","date_gmt":"2025-03-29T23:00:43","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=54148"},"modified":"2026-05-17T00:35:23","modified_gmt":"2026-05-16T15:35:23","slug":"quote-calculation-method","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/quote-calculation-method\/","title":{"rendered":"How to Calculate Estimated Costs | A Practical Example of Cost Calculation for Rock Bolt Installation"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

(This is a reprint of an article from fiscal year 2016.)<\/p>\n

 <\/p>\n

The other day, I heard from the anchor shop, and<\/p>\n

They said they wanted to get a more accurate estimate.<\/p>\n

As expected, when you transition from a craftsman-based system to an organized one, those kinds of issues tend to arise first.<\/p>\n

If you can't provide an accurate estimate, you'll keep getting taken advantage of.<\/p>\n

So, I gave him a quick lesson. (To the best of my ability.)<\/p>\n

\"\"<\/p>\n

We need to know the daily construction volume and the daily cost.<\/p>\n

I'll keep this brief.<\/p>\n

(Example) (Since this is from 2016, the unit price would be even higher in 2025!)<\/p>\n

Rock bolts: 4.1 m each \u00d7 100 = 410 m; Drill hole diameter: 65 mm<\/p>\n

Scaffolding provided. Skid drilling. Site Conditions II (Cost Estimation)<\/p>\n

 <\/p>\n

People: 25,000 yen \u00d7 3 people \u00d7 25 days<\/p>\n

Drill: 600,000 yen\/month<\/p>\n

Compressor: 100,000 yen\/month<\/p>\n

Generator: 100,000 yen\/month<\/p>\n

Vertical Mixer: 50,000 yen\/month<\/p>\n

Graut Pump: 120,000 yen\/month<\/p>\n

Fuel: 120,000 yen\/month<\/p>\n

Paste this into Excel, and<\/p>\n\n\n\n\n\n\n\n\n\n\n
Artificial<\/td>\n1,875,000<\/td>\n<\/tr>\n
Drilling Machine<\/td>\n600,000<\/td>\n<\/tr>\n
Compressor<\/td>\n100,000<\/td>\n<\/tr>\n
Generator<\/td>\n100,000<\/td>\n<\/tr>\n
Vertical Mixer<\/td>\n50,000<\/td>\n<\/tr>\n
Grout Pump<\/td>\n120,000<\/td>\n<\/tr>\n
Fuel<\/td>\n120,000<\/td>\n<\/tr>\n
\u3000Monthly Total<\/td>\n2,965,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

How many 4.1-meter rock bolts can you install in a day?<\/p>\n

For now, here,<\/p>\n

Since we'll be doing injections every day, let's say 13 vials.<\/p>\n

13 rolls \u00d7 4.1 m = 53.3 m\/day<\/p>\n

 <\/p>\n

The important thing here is,<\/p>\n

\"We can drill a lot more holes here, so let's go with 20!\"<\/strong><\/span><\/p>\n

Don't think that.<\/p>\n

With a typhoon on the way, heavy rain, and all sorts of weather conditions, there are also various causes for concern.<\/p>\n

ThatLoss<\/strong><\/span>That's what they say.<\/p>\n

You need to calculate the daily average, including that.<\/p>\n

Casing is a consumable, and bits wear out as well.<\/p>\n

We need to include that in the estimate.<\/p>\n

 <\/p>\n

As a rough estimate, try dividing your monthly cost by 25.<\/p>\n

2,965,000 yen \u00f7 25 days = 118,600 yen per day<\/p>\n

This is the daily minimum cost<\/span><\/strong><\/span>will be.<\/p>\n

Divide this amount by the daily work volume.<\/p>\n

118,600 yen \u00f7 53.3 m\/day = 2,226 yen\/m<\/p>\n

This is the unit price per meter<\/strong><\/span>will be.<\/p>\n

2,226 yen \u00d7 410 m = 912,660 yen<\/p>\n

This is the case for Site Conditions II:<\/p>\n

Lowest Prices for Drilling, Assembly, Injection, and Head Treatment<\/strong><\/span>That's it.<\/p>\n

If the daily construction volume falls below the target, the project will run at a loss.<\/span><\/strong><\/span>will be.<\/p>\n

However, this way, there\u2019s no profit. There are no company expenses either.<\/p>\n

Furthermore, given that the total length is 410 meters and the work is expected to proceed at a rate of 53.5 meters per day, the drilling and grouting will be completed in 8 days.<\/p>\n

Will it take two days to process the head!?<\/p>\n

\"Aluminum<\/p>\n

We only work 10 days out of the month.<\/p>\n

If you lease all the machinery, the price goes up by about 20 percent.<\/p>\n

Except for monthly plans, costs will increase.<\/p>\n

So, I'll multiply the total amount by about 1.2.<\/p>\n

 <\/p>\n

And then, transportation costs + plant installation costs + other negative factors<\/p>\n

Taking all of this into account,<\/p>\n

I think the price will rise to around 3,000 to 3,800 yen per meter.<\/p>\n

Of course, statutory welfare costs (such as social insurance) and other expenses are separate.<\/p>\n

 <\/p>\n

Do a good job and get paid a fair amount.<\/p>\n

We can build a good relationship with each other.<\/p>\n

\"Subcontracting<\/p>\n

There was a time in the past when I, too, tried to make a profit by using subcontractors at low rates.<\/p>\n

That was foolish of me. Looking back now, I wish I had just referred them to the general contractor.<\/p>\n

I became consumed by my own self-interest. Part of it was that things were really tough, but,<\/p>\n

To make sure I never do something like that again,<\/p>\n

We decided to refer all cases that we cannot handle in-house.<\/p>\n

I truly feel I did something very wrong to that company.<\/p>\n

 <\/p>\n

For civil engineering to improve even further,<\/p>\n

I still think it's better to share the benefits with each other.<\/p>\n

Both sides stand to profit. To make that happen, we need to understand our subcontractors as well.<\/p>\n

What we need to know is how much the general contractor paid to win the bid from the government agency.<\/p>\n

What were the details (cost estimate) of the winning bid?<\/p>\n

Based on that amount, how much should my company charge for the job so that the general contractor can make a profit?<\/p>\n

\"\"<\/p>\n

 <\/p>\n

There are various challenges, but,<\/span><\/strong><\/span><\/p>\n

Please feel free to ask me anything.<\/span><\/strong><\/span><\/p>\n

I'll do my best to help.<\/span><\/strong><\/span><\/p>\n

 <\/p>\n

See you later.<\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. (This is a reprint of an article from fiscal year 2016.) The other day, I heard from the anchor shop; they said they wanted to provide more accurate estimates. As expected, when you transition from being a sole craftsman to an organized business, these kinds of issues tend to come up first. Providing accurate estimates\u2026<\/p>","protected":false},"author":2,"featured_media":2086,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[38,1],"tags":[44,48,58,75,124,3642,4134],"class_list":["post-54148","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-construction-management","category-others","tag-44","tag-48","tag-58","tag-75","tag-124","tag-3642","tag-4134"],"acf":[],"yoast_head":"\n\u898b\u7a4d\u91d1\u984d\u306e\u7b97\u51fa\u65b9\u6cd5\uff5c\u30ed\u30c3\u30af\u30dc\u30eb\u30c8\u5de5\u4e8b\u306e\u539f\u4fa1\u8a08\u7b97\u306e\u5b9f\u4f8b - 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