KR20050024001A - Drilling patterns with rock mass rating for reducing overbreak of tunnel - Google Patents

Drilling patterns with rock mass rating for reducing overbreak of tunnel Download PDF

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Publication number
KR20050024001A
KR20050024001A KR1020030061794A KR20030061794A KR20050024001A KR 20050024001 A KR20050024001 A KR 20050024001A KR 1020030061794 A KR1020030061794 A KR 1020030061794A KR 20030061794 A KR20030061794 A KR 20030061794A KR 20050024001 A KR20050024001 A KR 20050024001A
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South Korea
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rock
tunnel
excavation
hole
grade
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KR1020030061794A
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Korean (ko)
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김양균
유정훈
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코오롱건설주식회사
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Priority to KR1020030061794A priority Critical patent/KR20050024001A/en
Publication of KR20050024001A publication Critical patent/KR20050024001A/en

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/006—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D3/00—Particular applications of blasting techniques
    • F42D3/04—Particular applications of blasting techniques for rock blasting

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Abstract

PURPOSE: A boring pattern for each rock grade for reducing overbreak of a tunnel is provided to prevent the concentration or reduction of explosive force of powder on the rock by boring a space gap of perimeter holes and a burden to a heating hole. CONSTITUTION: A boring pattern for each rock grade for reducing overbreak of a tunnel is composed of perimeter holes(10) bored at regular intervals along a contour line(E); a heating hole(20) spaced from the perimeter hole at a burden(B) in the perimeter hole, and plural central blast holes bored in the heating hole. The perimeter holes are bored with keeping a gap differently according to the grade of rocks to minimize overbreak.

Description

터널여굴 저감을 위한 암반등급별 천공패턴{DRILLING PATTERNS WITH ROCK MASS RATING FOR REDUCING OVERBREAK OF TUNNEL}DRILLING PATTERNS WITH ROCK MASS RATING FOR REDUCING OVERBREAK OF TUNNEL}

본 발명은 터널 굴착시 천공방법에 관한 것으로, 더욱 상세하게는 터널 굴착시 천공되는 굴착선공의 간격 및 굴착선공과 전열공 사이의 간격을 암반등급에 따라서 다르게 천공하여 터널을 발파할 때 발생할 수 있는 여굴의 발생을 최소화할 수 있는 터널여굴 저감을 위한 암반등급별 천공패턴에 관한 것이다.The present invention relates to a method for drilling during tunnel excavation, and more particularly, to the perforation of the excavated ships drilled in the tunnel excavation and the gap between the excavated ships and the heat-transfer holes according to the rock grade, which can occur when blasting the tunnel The present invention relates to a perforation pattern for each rock class to reduce tunnel overcast that can minimize the occurrence of overbreak.

일반적으로 지하 심부 또는 지형을 관통하여 건설되는 터널은 대부분의 경우 발파를 이용하여 굴착이 이루어지고 있다. 발파를 이용한 터널 굴착은 먼저, 다수개의 구멍을 소정의 간격과 깊이로 천공하고 여기에 폭약을 장착한 후, 이 폭약을 발파시켜 일정한 깊이만큼 굴착하는 방식이다.In general, tunnels that are constructed through deep underground or terrain are excavated using blasting in most cases. Tunnel excavation using blasting is a method in which a plurality of holes are first drilled at predetermined intervals and depths, explosives are attached thereto, and the explosives are then blasted to a predetermined depth.

이러한 발파를 이용하여 터널을 굴착할 때 발파 결과를 평가하는 가장 중요한 지표중 하나는 여굴(Overbreak)의 크기이다. 여굴이란 계획된 터널단면 크기 이상으로 굴착된 여분의 공간으로써, 여굴이 증가하게 되면 터널시공의 경제성과 터널의 안전성이 저하되는 결과를 초래한다.One of the most important indicators for evaluating blasting results when digging tunnels using such blasting is the size of overbreak. Over excavation is an extra space excavated more than the planned tunnel section size, and increasing over excavation results in deterioration of tunnel construction economy and tunnel safety.

따라서 터널공사현장에서는 여굴을 최소화하기 위한 다양한 방법과 기술이 적용되고 있다.Therefore, various methods and techniques have been applied at the tunnel construction site to minimize overbreak.

이러한 발파를 이용한 터널 굴착의 주요공정은 막장에 구멍을 뚫기위한 천공작업과, 천공된 구멍에 화약을 충진하는 장약작업, 충진된 장약을 폭파하는 폭파작업으로 대별될 수 있는데, 그중 여굴형성에 가장 큰 영향을 주는 것은 천공작업이며, 천공작업중에서도 계획된 터널단면의 최외곽에 천공하는 굴착선공의 천공각, 천공착점의 위치, 천공간격에 따라서 여굴의 발생이 다르게 나타난다.The main process of tunnel excavation using blasting can be roughly divided into drilling work for drilling holes in the membrane, charge work for filling gunpowder holes, and blasting work for blasting filled charges. The most influential effect is the drilling work, and even during the drilling work, the occurrence of overbreak differs depending on the drilling angle of the drilling rig drilled in the outermost part of the planned tunnel section, the location of the drilling point, and the space spacing.

상기 천공각은 천공장비인 점보드릴(Jumbo drill)을 이용하여 천공할 때, 실제 천공을 수행하는 부위인 비트(Bit)와 터널벽면이 이루는 각도를 말하는데, 필연적으로 비트를 터널 외곽방향으로 어느 정도의 각도를 주어서 천공을 하게된다.The puncture angle refers to the angle formed by the bit (Bit) and the tunnel wall surface when performing the puncturing using a jumbo drill, which is a puncturing equipment. Perforated by giving the angle of.

그러나 천공각이 증가하면 그만큼 여굴은 증가하게 되는데, 천공각이 증가하는 원인중에는 터널측벽에 형성된 불규칙한 굴착면으로 인해 천공작업자의 의지와 무관하게 천공각이 증가하는 경우도 있다. 이때 터널측벽 굴착면의 굴곡이 심해지는 것은, 동일한 막장에 대한 굴착선공의 공간경이 일정하지 않고 위치에 따라 불규칙하게 변화하므로 화약의 폭발력이 균일하게 작용하지 않기 때문이기도 하다.However, as the perforation angle increases, the overburden increases, and one of the reasons for the increase in perforation angle is the increase in the perforation angle regardless of the will of the perforator due to the irregular excavation surface formed in the tunnel side wall. At this time, the bending of the tunnel side wall excavation surface is severe because the explosive force of the excavation liner for the same membrane is not constant and changes irregularly according to the position, so that the explosive force of the gunpowder does not work uniformly.

상기에서 천공착점이란 터널막장에서 천공이 시작되는 위치를 일컫는 것으로서 천공착점을 굴착설계선 외측에 설정할수록 여굴은 자연스럽게 증가하게 된다. 지금까지 천공착점은 대부분의 현장에서 미굴을 방지하기 위해 계획된 굴착설계선상에 위치하거나 그 외측으로 설정하고 있다.As described above, the puncture point refers to the position where the puncture starts at the tunnel curtain. As the puncture point is set outside the excavation design line, the overbreak naturally increases. To date, drilling holes have been located on or outside the excavation design planned for most sites.

도 3은 종래의 터널공사시 폭약을 장착하기 위한 발파공이 천공된 것을 나타내는 터널 막장의 단면도로서, 터널굴착을 위하여 터널의 굴착설계선(E)을 따라서 굴착선공(외곽공)(100)을 소정의 간격으로 천공하고, 이들 굴착선공(100)의 내측으로 굴착선공과 소정의 간격, 즉 최소저항선(B)을 유지하여 전열공(200)을 천공하며, 상기 전열공(200)의 내측으로 다수개의 중앙부 발파공(300)을 천공한다.3 is a cross-sectional view of a tunnel face showing that the blast hole for mounting the explosives during the conventional tunnel construction, a predetermined excavation line hole (outer hole) 100 along the excavation design line (E) of the tunnel for tunnel excavation Perforations at intervals of perforations, and perforate the heat transfer holes 200 by maintaining a predetermined distance, that is, a minimum resistance line B, with the excavation ships holes inwards of these excavation ships 100, and a plurality of inwards of the heat transfer holes 200. Drills the central blasting hole 300.

이때 상기 굴착선공(100)들은 대략 55~70cm의 간격으로 천공하고, 굴착선공(100)과 전열공(200) 사이의 거리는 대략 70~80cm를 유지하여 천공한다.At this time, the excavation line 100 is drilled at intervals of about 55 ~ 70cm, the distance between the excavation line 100 and the heat transfer hole 200 is maintained by maintaining about 70 ~ 80cm.

이와 같이 굴착선공(100)과 전열공(200) 및 중앙부 발파공(300)이 천공되면, 여기에 화약을 장착하고 발파하여 일정한 깊이만큼 굴착하는 방법으로 터널공사를 행한다.As such, when the excavation line 100, the heat transfer hole 200, and the central blasting hole 300 are perforated, the tunnel construction is performed by mounting the explosives and blasting the excavation to a certain depth.

그러나 이와 같은 터널굴착시 굴착선공(100)들의 간격 및 굴착선공(100)과 전열공(200) 사이의 거리는 암질의 상태와 상관없이 일정하게 천공하므로, 여기에 화약을 삽입하고 발파할 경우 암반상태에 따라서 폭발력이 집중되거나 약화되므로 여굴 또는 미굴이 발생하게 된다.However, because the distance between the excavation ships 100 and the distance between the excavation ships 100 and the heat transfer hole 200 is punctured irrespective of the condition of the rock, when the tunnel is excavated, the rock state is inserted into the blasting. Depending on the explosive force is concentrated or weakened so that over or under the mine.

이러한 여굴 및 미굴을 줄이기 위하여 막장의 암질이 불량한 경우와 양호한 경우로 나누어 천공간격을 다르게 하기도 한다.In order to reduce such overbreak and overbreak, the spacing of the membrane is divided into a case of poor quality and a case of good, and the space spacing is different.

본 발명은 상기한 바와 같은 종래의 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 터널 굴착시 천공되는 굴착선공의 간격 및 굴착선공과 전열공 사이의 간격을 암반등급에 따라서 다르게 천공하여, 터널을 발파할 때 발생할 수 있는 여굴의 발생을 최소화할 수 있는 터널여굴 저감을 위한 암반등급별 천공패턴을 제공하는데 있다.The present invention has been made in order to solve the conventional problems as described above, the object of the present invention is to drill the gap between the excavated ship hole and the gap between the excavated ship hole and the heat-transfer hole drilled differently according to the rock grade, In order to minimize the occurrence of overbreak that can occur when blasting a tunnel, it is to provide a perforation pattern for each rock grade to reduce the tunnel overcast.

본 발명이 제안하는 터널여굴 저감을 위한 암반등급별 천공패턴은, 터널굴착을 위하여 터널의 굴착설계선을 따라서 소정의 간격으로 천공된 굴착선공(외곽공)과, 상기 굴착선공의 내측으로 굴착선공과 소정의 거리, 즉 최소저항선(B)을 유지하여 천공된 전열공과, 상기 전열공의 내측으로 다수개의 중앙부 발파공을 천공하는 터널굴착을 위한 천공패턴에 있어서,The rock pattern perforation pattern for reducing the tunnel excavation proposed by the present invention, the excavation liner (outer hole) perforated at predetermined intervals along the excavation design line of the tunnel for tunnel excavation, and the excavation liner to the inside of the excavation liner In the drilled pattern for tunnel excavation for drilling a plurality of central blasting holes in the inner side of the heat-transfer hole and the heat-transfer hole to maintain a predetermined distance, that is, the minimum resistance line (B),

상기 굴착선공의 천공은 여굴의 발생을 최소화하기 위하여 암반등급에 따라서 그 간격을 다르게 천공하는 터널여굴 저감을 위한 암반등급별 천공패턴을 제공한다.The perforation of the excavation ship provides a perforation pattern for each rock class to reduce the tunnel perforation to perforate the gap differently according to the rock grade in order to minimize the occurrence of over drilling.

상기 굴착선공의 천공간격은 암반등급1은 70~75cm, 암반등급2는 65~70cm, 암반등급3은 60~65cm, 암반등급4는 50~55cm, 암반등급5는 45~50cm의 간격으로 천공하는 터널여굴 저감을 위한 암반등급별 천공패턴을 제공한다.The drilling space for drilling rigs is drilled at intervals of 70 ~ 75 cm for rock class 1, 65 to 70 cm for rock class 2, 60 to 65 cm for rock class 3, 50 to 55 cm for rock class 4, and 45 to 50 cm for rock class 5 To provide a perforation pattern for each rock class for tunnel tunnel reduction.

상기 전열공의 천공은 암반등급에 따라서 굴착설계선으로부터 최소저항선을 다르게 유지한 상태로 천공하는 터널여굴 저감을 위한 암반등급별 천공패턴을 제공한다.The perforation of the heat transfer hole provides a perforation pattern for each rock class to reduce the tunnel overhang in the state of maintaining the minimum resistance line from the excavation design line according to the rock grade.

상기 굴착설계선으로부터 전열공까지의 거리, 즉 최소저항선은 암반등급1은 80~90cm, 암반등급2는 75~85cm, 암반등급3은 70~80cm, 암반등급4는 60~70cm, 암반등급5는 55~65cm로 유지하며 전열공을 천공하는 터널여굴 저감을 위한 암반등급별 천공패턴을 제공한다.The distance from the excavation design line to the heating hole, that is, the minimum resistance wire is 80 ~ 90 cm for rock class 1, 75 to 85 cm for rock class 2, 70 to 80 cm for rock class 3, 60 to 70 cm for rock class 4, and rock class 5 Maintains 55 ~ 65cm and provides perforation pattern for each rock grade to reduce tunnel overhole.

이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 더욱 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

도 1은 본 발명에 따른 터널여굴 저감을 위한 암반등급별 천공패턴에 따라서 발파공이 천공된 것을 나타내는 터널막장의 단면도이고, 도 2는 도 1의 주요부분확대도를 나타낸다.1 is a cross-sectional view of a tunnel membrane showing that the blast holes are punctured according to the rock pattern grade perforation pattern for tunnel tunnel reduction according to the present invention, Figure 2 is an enlarged view of the main portion of FIG.

도시된 바와 같이 본 발명에 따른 터널여굴 저감을 위한 암반등급별 천공패턴은, 터널굴착을 위하여 터널의 굴착설계선(E)을 따라서 소정의 간격으로 굴착선공(외곽공)(10)을 천공하고, 이들 굴착선공(10)의 내측으로 굴착선공과 소정의 간격, 즉 최소저항선(B)을 띄운 채 전열공(20)을 소정의 간격으로 천공하며, 상기 전열공(20)의 내측으로 다수개의 중앙부 발파공(30)을 천공하는 패턴으로 이루어진다.As shown, per rock pattern perforation pattern for tunnel excavation reduction according to the present invention, perforating excavation line hole (outer hole) 10 at predetermined intervals along the excavation design line (E) of the tunnel for tunnel excavation, Drilling the heat-transfer hole 20 at predetermined intervals with a predetermined distance, that is, a minimum resistance line (B) with the excavation ship hole 10 inside the excavation ship hole 10, a plurality of central portion in the inside of the heat-transfer hole (20) It is made of a pattern for puncturing the blast hole (30).

상기와 같은 천공작업시 점보드릴을 이용할 수 있는데, 컴퓨터가 장착되지 않은 점보드릴을 이용할 경우, 먼저 터널 막장에 터널 내공의 굴착설계선(E)을 표시하는 마킹(Marking)작업을 실시한다.In the above puncture operation, the dot board reel may be used. When using a dot board reel not equipped with a computer, first, a marking operation is performed to mark the excavation design line E of the tunnel hole at the tunnel face.

마킹작업은 예를 들면 광파측정기 등을 이용하여 설계도상의 굴착설계선 위치에 일정한 간격으로 점을 표시한 후, 표시된 점들을 선으로 연결하는 방법으로 터널막장에 굴착설계선(E)을 표시할 수 있다.In the marking operation, for example, an excavation design line (E) may be displayed on the tunnel barrier by marking points at regular intervals at the excavation design line position on the design using an optical wave measuring instrument and then connecting the displayed points with lines. have.

이러한 굴착설계선(E)이 마킹되면, 천공이 시작되는 부분인 천공착점에 점보드릴의 비트를 위치시킨 후 천공하게 되는데, 이때 천공착점이 굴착설계선(E) 외측에 위치하면 여굴이 발생하고, 굴착설계선(E) 내측으로 위치하면 미굴이 발생하게 된다.When the excavation design line (E) is marked, the bit of the point board reel is placed at the drilling start point, which is the starting point of the drilling, and then drilled. At this time, if the drilling point is located outside the excavation design line (E), over drilling occurs. When located inside the excavation design line (E), the tailings will be generated.

그러한 여굴과 미굴을 최소화할 수 있는 방안으로서 굴착선공(10)의 천공착점 위치를 굴착설계선(E)의 내측 0~2cm사이에 위치시키면, 부분적으로 약간의 미굴이 발생할 수도 있지만 여굴은 허용기준치 이내에서 최소화할 수 있다.If the drilling point location of the excavation ship hole 10 is located between 0 ~ 2cm inside the excavation design line E as a way to minimize such over excavation and mining, some mining may occur, but the excavation is an acceptable standard value. It can be minimized within.

또한 본 발명은 여굴의 생성을 더욱 최소화하기 위하여, 상기와 같은 굴착선공(10) 천공 및 전열공(20) 천공시 암반등급에 따라서 굴착선공(10)들 사이의 간격 및 최소저항선(B)을 다르게 유지한 상태로 천공하도록 하고 있다.In addition, the present invention in order to further minimize the generation of overhang, the gap between the excavation ships 10 and the minimum resistance line (B) in accordance with the rock grade during the drilling and hole drilling (10) perforations and heat holes 20 as described above Perforations are maintained differently.

상기 암반등급은 암반의 지질구조와 물리적 성질을 암반특성에 따라 암반공학적으로 분류한 RMR(Rock Mass Rating)등급을 적용할 수 있으며, 그 등급에 따라서 극경암, 경암, 보통암, 연암, 풍화암 등으로 이루어지며, 아래의 표 1에 나타낸 바와 같은 방법으로 천공하는 것이 바람직하다.The rock grade may be applied to the rock mass rating (RMR) grade, which is classified into rock-engineering according to the rock characteristics, geological structure and physical properties of the rock mass, such as hard rock, hard rock, ordinary rock, soft rock, weathered rock, etc. It is made of, preferably perforated by a method as shown in Table 1 below.

암반등급        Bedrock grade 1 One 2 2 3 3 4 4 5 5 RMR           RMR 100~81 100-81 80~61 80-61 60~41 60-41 40~21 40-21 20~0 20 ~ 0 굴착선공 Excavation 공간격(S)㎝ Spacing (S) cm 70~75 70-75 65~70 65-70 60~65 60-65 50~55 50-55 45~50 45-50 최소저항선(B)㎝ Resistance line (B) cm 80~90 80-90 75~85 75-85 70~80 70-80 60~70 60-70 55-65 55-65

상기 표 1에 나타낸 바와 같이 암반상태에 따라서 굴착선공(10)의 공간격과 최소저항선(B)을 다르게 천공하여 여굴을 효과적으로 저감시킬 수 있는데, 암반등급이 불량할수록 등급당 대략 5~10cm 정도씩 공간격을 줄여서 천공한다.As shown in Table 1, perforations can be effectively reduced by drilling the space spacing and the minimum resistance line (B) of the excavation ship hole 10 differently according to the rock condition, and as the rock grade is poor, about 5-10 cm per grade. Reduce the space gap and drill.

상기한 실시 예에서 천공작업시 점보드릴의 비트(Bit)와 터널벽면이 이루는 각도인 천공각을 3°정도로 유지한 채 천공하면 여굴을 더욱 감소시킬 수 있다.In the above embodiment, the drilling may be further reduced by drilling while maintaining the drilling angle, which is an angle formed by the bit of the dot board reel and the tunnel wall surface at about 3 °, during the drilling operation.

상기와 같이 터널발파를 위해 발파공이 천공되면, 중앙부 발파공(30), 전열공(20) 및 굴착선공(10)에 폭약을 장착한 후, 이 폭약을 차례대로 발파시켜 일정한 깊이만큼 굴착하게 되는데, 이때 암질상태에 따라 굴착선공(10)의 공간격 및 최소저항선(B)의 위치가 다르므로 암반에 화약의 폭발력이 집중되거나 약화되지 않아 여굴의 생성을 효과적으로 저감시킨다.When the blasting hole is drilled for tunnel blasting as described above, after the explosives are mounted in the central blasting hole 30, the heat-transfering hole 20, and the excavation ship hole 10, the explosives are sequentially blasted to excavate to a certain depth. At this time, since the space of the excavation ship 10 and the location of the minimum resistance line (B) is different according to the rocky state, the explosive force of the gunpowder is not concentrated or weakened in the rock, effectively reducing the generation of overhang.

이상 설명한 바와 같이 본 발명에 의한 터널여굴 저감을 위한 암반등급별 천공패턴은, 암반등급에 따라서 굴착선공의 공간격과 전열공까지의 최소저항선을 다르게 천공하므로, 여기에 폭약을 장착하고 발파시킬 때, 암반에 화약의 폭발력이 집중되거나 약화되지 않아 여굴의 발생을 최소화할 수 있다.As described above, the perforation pattern for each rock class for reducing tunnel excavation according to the present invention drills the minimum resistance line to the space spacing and the heat-transfer hole of the excavation ship according to the rock class, and therefore, when the explosives are mounted and blasted, The explosive force of the gunpowder is not concentrated or weakened in the rock, minimizing the occurrence of overbreak.

도 1은 본 발명에 따른 터널여굴 저감을 위한 암반등급별 천공패턴에 따라서 발파공이 천공된 것을 나타내는 터널막장의 단면도.1 is a cross-sectional view of a tunnel membrane showing that the blast holes are perforated according to the perforation pattern for each rock class for tunnel tunnel reduction according to the present invention.

도 2는 도 1의 주요부분 확대도.Figure 2 is an enlarged view of the main part of Figure 1;

도 3은 종래의 터널공사시 폭약을 장착하기 위한 발파공이 천공된 것을 나타내는 터널 막장의 단면도.Figure 3 is a cross-sectional view of the tunnel membrane showing that the blast hole for mounting the explosives during the conventional tunnel construction.

Claims (5)

터널굴착을 위하여 터널의 굴착설계선을 따라서 소정의 간격으로 천공된 굴착선공(외곽공)과, 상기 굴착선공의 내측으로 굴착선공과 소정의 거리, 즉 최소저항선을 띄우고 천공된 전열공과, 상기 전열공의 내측으로 다수개의 중앙부 발파공을 천공하는 터널굴착을 위한 천공패턴에 있어서,For the excavation of the tunnel, the excavation line hole (outer hole) perforated at predetermined intervals along the excavation design line of the tunnel, and the heat transfer hole perforated with the excavation line hole at a predetermined distance, that is, the minimum resistance line, In the drilling pattern for tunnel excavation for drilling a plurality of central blasting holes in the inner side of the heat hole, 상기 굴착선공의 천공은 여굴 발생을 최소화하기 위하여 암반등급에 따라서 그 간격을 다르게 유지하며 천공하는 터널여굴 저감을 위한 암반등급별 천공패턴.Perforation of the excavated ship hole to maintain the gap according to the rock grade in order to minimize the occurrence of rock drilling patterns for each rock grade to reduce the drilling perforation. 청구항 1에 있어서, 상기 굴착선공의 천공간격은 RMR에 의한 암반등급1은 70~75cm, 암반등급2는 65~70cm, 암반등급3은 60~65cm, 암반등급4는 50~55cm, 암반등급5는 45~50cm의 간격으로 천공하는 것을 특징으로 하는 터널여굴 저감을 위한 암반등급별 천공패턴.The space spacing of the excavation liner is rock mass class 1 by 70 ~ 75cm, rock class 2 is 65 ~ 70cm, rock class 3 is 60 ~ 65cm, rock class 4 is 50 ~ 55cm, rock class 5 The perforation pattern for each rock class for tunnel tunnel reduction, characterized in that the perforation at intervals of 45 ~ 50cm. 청구항 1에 있어서, 상기 굴착선공의 천공시 천공착점 위치는 굴착설계선의 내측 0~2cm사이에 위치시켜 천공하는 것을 특징으로 하는 터널여굴 저감을 위한 암반등급별 천공패턴.The method according to claim 1, wherein the drilling hole position when drilling the drill hole is located between 0 ~ 2cm inside the excavation design line to drill the rock pattern for each tunnel grade for reducing the tunnel drilling. 청구항 1에 있어서, 상기 전열공의 천공은 암반등급에 따라서 굴착설계선으로부터 최소저항선을 다르게 유지한 상태로 천공하는 것을 특징으로 하는 터널여굴 저감을 위한 암반등급별 천공패턴.The method of claim 1, wherein the perforations of the heat-transfer hole according to the rock grade according to the rock-grade grade perforation pattern for reducing the tunnel overburden, characterized in that the perforated state maintained differently from the excavation design line. 청구항 4에 있어서, 상기 굴착설계선으로부터 전열공까지의 거리, 즉 최소저항선은, RMR에 의한 암반등급1은 80~90cm, 암반등급2는 75~85cm, 암반등급3은 70~80cm, 암반등급4는 60~70cm, 암반등급5는 55~65cm를 유지하며 천공하는 것을 특징으로 하는 터널여굴 저감을 위한 암반등급별 천공패턴.The method according to claim 4, wherein the distance from the excavation design line to the heat-transfer hole, that is, the minimum resistance line is 80 ~ 90cm, rock grade 2 is 75 ~ 85cm, rock grade 3 is 70 ~ 80cm, rock grade by RMR 4 is 60 ~ 70cm, rock grade 5 is 55 ~ 65cm to maintain the perforation pattern for rock tunnel reduction, characterized in that the perforation pattern.
KR1020030061794A 2003-09-04 2003-09-04 Drilling patterns with rock mass rating for reducing overbreak of tunnel KR20050024001A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160047228A (en) * 2014-10-22 2016-05-02 박재현 Cross-Section Tunnel Construction Method Using Rock Mass Quality Rating

Citations (3)

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Publication number Priority date Publication date Assignee Title
KR19980016610A (en) * 1996-08-29 1998-06-05 정순착 Blasting Rock Classification Technology, Blasting Design and Tunnel Blasting Method Considering Discontinuities in Rock
KR20030015900A (en) * 2001-07-11 2003-02-26 기경철 A tunnel blasting method favorable to the environment,which utilizes pre-splitting and an upper center cut
KR100418134B1 (en) * 2001-02-24 2004-02-19 에스케이건설 주식회사 Tunnel Excavation Method Using Blasting Rock Classification

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980016610A (en) * 1996-08-29 1998-06-05 정순착 Blasting Rock Classification Technology, Blasting Design and Tunnel Blasting Method Considering Discontinuities in Rock
KR100418134B1 (en) * 2001-02-24 2004-02-19 에스케이건설 주식회사 Tunnel Excavation Method Using Blasting Rock Classification
KR20030015900A (en) * 2001-07-11 2003-02-26 기경철 A tunnel blasting method favorable to the environment,which utilizes pre-splitting and an upper center cut

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160047228A (en) * 2014-10-22 2016-05-02 박재현 Cross-Section Tunnel Construction Method Using Rock Mass Quality Rating

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