JPH02234000A - Simplified calculation method for packing length, etc., in boring blast - Google Patents

Abstract

PURPOSE:To allow not only experienced person but also beginners to very speedily, simply and easily calculate safety figures for avoiding accidents such as blast-off of stone, etc., by specifying the relation of the bore diameter to a packing length, and to a corresponding explosive length (charge amount of explosive). CONSTITUTION:Packing length = D meter, bore diameter = r meter, and safety factor = a. In case normal figure of a = 10, the packing length D is determined according to the following formula: D=ar+1. Next, in case an explosive charge length = l meter, and a boring length = h meter, the explosive charge length is determined according to the following formula: l=h-D. Then, in case the specific gravity of explosive S=0.83, the explosive charge amount L is determined according to the following formula: L=0.14X(0.5r)<2>XSXl.

Description

【発明の詳細な説明】 ［産業上の利用分野］ この発明は、穿孔発破作業において，穿孔径を算出基準
にして安全な込物長及び装薬長（装薬量）を簡単に決定
する方法に関する． ［従来の技術１ 従来、穿孔発破作業において、安全な込物長及び装薬長
（装薬Ｍ）を決定することは、永年の経験者であっても
、穿孔径や穿孔長のさまざまな変化に対応する必要上、
難しい計算により決定するか、または、永年にわたって
磨かれた「勘」によって決定しており、初心者にとって
は見当のつかない極めて難しい危険事とされていた．［
発明が解決しようとする課題］ しかしながら、従来，Ｈしい計算によって決められた込
物長や装薬長（装薬量）が決して安全率の高いものでな
かったことは、実際上、頻繁な***作業事故とりわけ飛
石事故の多発によって裏付けられる． この発明の目的は、従来における発破作業の数多くの資
料を分析して、経験者はもとより、初心者であっても迅
速簡単かつ飛石事故の生じない安全な発破作業を遂行し
得る込物長及び装薬長（装薬量）を決定する方法を提供
することである．［課題を解決するための手段］ この発明は、上記の目的を達するために，込物長をＤメ
ートル、穿孔径をｒメートル、安全係数を８、そのａの
通常値を１０とした場合に、Ｄ＝ａｒ＋　　１ の公式で込物長を決定する． 更に、装薬長をβメートル、穿孔長をｈメートルとした
場合に、 Ｒ＝ｈ−Ｄ の公式で装薬長を決定する． 更に，装薬量をＬキログラム、装薬比重をＳ＝０．８３
とした場合に、 Ｌ＝３．１４Ｘ　（０．５ｒ）　　２ＸＳＸｆｆの公式
で装薬量を決定する． ［作　　　用］ 本発明による公式を算出の基礎にすると、作業員が現場
で暗算にて簡単かつ容易に、飛石事故の生じるおそれの
ない込物長，装薬長（装薬量）の安全値を算出すること
ができる． ［実　施　例］ 穿孔径ｒ＝３ｏｎ＋ｍ＝０．０３ｍ、安全係数ａ＝ｌＯ
の場合に、 込物長Ｄ＝ａｒ＋１ ＝１０ｘＯ．０３＋１ ＝１．３ｍ となる． 次に、穿孔長ｈ＝２．６の場合に 装薬長ｎ＝ｈ−Ｄ ＝２．６−１．３ ＝１．３ｍ となる． 更に、装薬比重Ｓ＝０．８３とした場合に、装薬ｆｆｉ
Ｌ＝３．ｌ　４ｘ　（０．５ｘｒ）”　ｘｆｆ＝３．１
４Ｘ　（０．５ＸＯ．０３） Ｘ０．８３Ｘ１．３ ＝０．７６ｋｇ となる． また、最小抵抗線Ｗｍは Ｗ＝Ｄ＋βの中点 ＝１．　　３＋　　（１．　　３　７　２）＝１．　　
３＋０．　　６５ ＝１．　　９５ｍ となる． ***係数Ｃは Ｃ＝Ｌ／Ｗ” ＝Ｑ，７６／（１．９５） ＝０．　　１　０ｋｇ／ｍ　’ となる． 一般的な***工事において、中硬岩の***係数Ｃは０．
２５〜０．３５であるから、前記実施例の***係数Ｃ＝
０．１０を上記と対比すれば、後者の数値が低く、飛石
を起す心配がないことが判る． 込物長Ｄ＝ａｒ＋１の公式において、安全係数ａ＝１０
とした場合における各穿孔径ｒの変化に対応した数値を
第１表で示す６ 第１表 この第１表において***係数Ｃの数値を検討すると、穿
孔径７０ｍｍまではＣ＝０．３５以下の数値を示すので
安全係数ａ＝１０として計算した第１表が通用するが、
穿孔径８０ｍｍ以上の場合にはＣ＝０．３５以上の数値
を示し、飛石事故発生のおそれがあり危険である． そこで、穿孔径８０＋ｎｍ以上の場合には安全係数ａ＝
２０Ｌて計算すれば、上記の危険が解消される（第２表
参照）． ＩＪ２表 ［発明の効果］ 本発明による公式Ｄ＝ａｒ＋１　（ただしａ＝１０また
は２０とする）は、穿孔径ｒに対する込物長Ｄの関係を
次のように簡単に暗算で算出し得る．例えば、第１表に
おいて、ａ＝ｌｏの場合に、ｒ＝　　２５ｎ＋ｍのとき
、Ｄ＝１．２５ｍ、ｒ＝　　３０＋ｎ＋ｎのとき、Ｄ＝
１．３０ｍ、ｒ＝１００ｍＩｌのとき．Ｄ＝２．ＯＯｍ
、ｒ＝１４０ｎ＋ｍのとき、Ｄ＝２．４０ｍ、次に、第
２表において、ａ＝２０の場合に、穿孔径　８０１１１
１１１のとき、 Ｄ＝１．８０＋０．８０＝２．６０ｍ 穿孔径　９０ｍｍのとき、 Ｄ＝１．９０＋０．９０＝２．８０ｍ 穿孔径１４０＋ａｍのとき、 Ｄ＝２．４０＋１．４０＝３．８０ｍ このように、本発明によれば、発破作業において、穿孔
径ｒから込物長Ｄ、それに伴なう装薬長（装薬！）を、
経験者ばかりでなく初心者であっても．飛石事故の生じ
ない安全な数値を極めて簡単迅速かつ確実容易に暗算に
て算出することができるようになった．[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for easily determining safe plug length and charge length (charge amount) using the borehole diameter as a calculation standard in drilling and blasting work. Regarding. [Conventional technology 1] Conventionally, in drilling and blasting work, determining the safe fill length and charge length (charge M) has been difficult even for those with many years of experience due to various changes in the hole diameter and length. Due to the need to respond to
Decisions were made by difficult calculations or by "hunch" honed over many years, and were considered extremely difficult and dangerous for beginners. [
[Problems to be Solved by the Invention] However, the fact that the fill length and charge length (charge amount) conventionally determined by accurate calculations has never had a high safety factor is that in practice, frequent explosions This is evidenced by the frequent occurrence of work accidents, especially flying stone accidents. The purpose of this invention is to analyze a large number of materials related to conventional blasting work, and to develop a material length and equipment that enables not only experienced people but also beginners to carry out blasting work quickly, easily, and safely without causing flying stone accidents. The objective is to provide a method for determining drug length (loading amount). [Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a method in which the filling length is D meters, the hole diameter is r meters, the safety factor is 8, and the normal value of a is 10. , D = ar + 1. Determine the fill length using the formula. Furthermore, if the charge length is β meters and the drilling length is h meters, determine the charge length using the formula R=h−D. Furthermore, the amount of charge is L kilograms, and the specific gravity of the charge is S = 0.83.
In this case, determine the amount of charge using the formula L=3.14X (0.5r) 2XSXff. [Function] When the formula according to the present invention is used as the basis for calculation, workers can easily and easily calculate the safe values of the fill length and charge length (charge amount) without the risk of a flying stone accident on site by mental calculation. can be calculated. [Example] Hole diameter r=3on+m=0.03m, safety factor a=lO
In the case, the filling length D=ar+1=10xO. 03+1 = 1.3m. Next, when the drilling length h = 2.6, the charge length n = h - D = 2.6 - 1.3 = 1.3 m. Furthermore, when the charge specific gravity S=0.83, the charge ffi
L=3. l 4x (0.5xr)” xff=3.1
4X (0.5XO.03) X0.83X1.3 = 0.76kg. Moreover, the minimum resistance line Wm is W=D+β midpoint=1. 3+ (1. 3 7 2)=1.
3+0. 65 = 1. It will be 95m. The blasting coefficient C is C=L/W" = Q, 76/(1.95) = 0.10kg/m'. In general blasting work, the blasting coefficient C of medium-hard rock is 0.
Since it is 25 to 0.35, the explosion coefficient C=
Comparing 0.10 with the above value, it can be seen that the latter value is low and there is no risk of flying stones. In the formula of included length D=ar+1, safety factor a=10
Table 1 shows the numerical values corresponding to changes in each hole diameter r when Since it shows numerical values, Table 1 calculated with the safety factor a = 10 is valid, but
If the hole diameter is 80mm or more, the C value will be greater than 0.35, which is dangerous as there is a risk of a flying stone accident. Therefore, when the hole diameter is 80+nm or more, the safety factor a=
If you calculate 20L, the above danger will be eliminated (see Table 2). Table IJ2 [Effects of the Invention] Using the formula D=ar+1 according to the present invention (where a=10 or 20), the relationship between the hole diameter r and the filling length D can be easily calculated mentally as follows. For example, in Table 1, when a=lo, when r=25n+m, D=1.25m, and when r=30+n+n, D=
When 1.30m and r=100ml. D=2. OOm
, when r=140n+m, D=2.40m, then in Table 2, when a=20, the hole diameter is 80111
When the hole diameter is 111, D = 1.80 + 0.80 = 2.60 m When the hole diameter is 90 mm, D = 1.90 + 0.90 = 2.80 m When the hole diameter is 140 + am, D = 2.40 + 1.40 = 3.80 m This According to the present invention, in the blasting operation, the charging length D and the accompanying charge length (charge!) can be calculated from the hole diameter r.
Not only for experienced users but also for beginners. It is now possible to use mental calculations to calculate safe numerical values that will not cause flying stone accidents, extremely simply, quickly, reliably, and easily.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明に使用される諸元相互の関係を示した説明
図である． ｒ・・・・穿孔径（装薬径）（ｍ）、 ｈ・・・・穿孔長（ｍ）、 Ｄ・・・・込物長（ｍ）、 ｅ・・・・装薬長（ｍ）， Ｌ・・・・装薬量（ｋｇ）、 Ｗ・・・・最小抵抗線（ｍ）．The drawing is an explanatory diagram showing the relationship between specifications used in the present invention. r...Drilling diameter (charge diameter) (m), h...Drilling length (m), D...Filling length (m), e...Charge length (m) , L... Charge amount (kg), W... Minimum resistance line (m).

Claims (3)

【特許請求の範囲】[Claims] （１）込物長をＤメートル、穿孔径をｒメートル、安全
係数をａ、そのａの通常値を１０とした場合に、 Ｄ＝ａｒ＋１ の公式で込物長を決定することを特徴とする穿孔発破に
おける込物長等の簡易算出方法。(1) When the filling length is D meters, the hole diameter is r meters, the safety factor is a, and the normal value of a is 10, the filling length is determined by the formula D=ar+1. A simple method for calculating the fill length, etc. in drilling and blasting. （２）装薬長をｌメートル、穿孔長をｈメートル、とし
た場合に、 ｌ＝ｈ−Ｄ の公式で装薬長を決定することを特徴とする請求項１記
載の穿孔発破における込物長等の簡易算出方法。(2) The charge length is determined by the formula l=h-D, where the charge length is 1 meter and the hole length is h meters. Simple calculation method for length, etc. （３）装薬量をＬキログラム、装薬比重をＳとした場合
に、 Ｌ＝３．１４×（０．５ｒ）＾２×Ｓ×ｌ の公式で装薬量を決定することを特徴とする請求項２記
載の穿孔発破における込物長等の簡易算出方法。(3) When the charge amount is L kilograms and the specific gravity of the charge is S, the charge amount is determined by the formula L=3.14×(0.5r)^2×S×l. A simple method for calculating the fill length, etc. in drilling and blasting according to claim 2.