JP3436973B2 - Prior reinforcement method of tunnel leg - Google Patents
Prior reinforcement method of tunnel legInfo
- Publication number
- JP3436973B2 JP3436973B2 JP14078294A JP14078294A JP3436973B2 JP 3436973 B2 JP3436973 B2 JP 3436973B2 JP 14078294 A JP14078294 A JP 14078294A JP 14078294 A JP14078294 A JP 14078294A JP 3436973 B2 JP3436973 B2 JP 3436973B2
- Authority
- JP
- Japan
- Prior art keywords
- tunnel
- face
- ground
- upper half
- leg
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、トンネル掘削時にお
いてトンネル側壁部における鋼製門型支保工の脚部の支
持部の先行補強方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preliminarily reinforcing a support portion of a leg portion of a steel gate-type support structure on a side wall of a tunnel during excavation of the tunnel.
【0002】[0002]
【従来の技術】一般にNATM工法によるトンネル掘削
工事においては地表沈下量に対する制限があり、極力沈
下を抑制する必要がある。2. Description of the Related Art Generally, in tunnel excavation work by the NATM method, there is a limit to the amount of subsidence, and it is necessary to suppress subsidence as much as possible.
【0003】ところで従来のトンネル掘削においては、
所定長掘削する度にその切羽の両側下端位置においてト
ンネル側方に向かって水平方向又は斜め下向きにロック
ボルト又は鋼管を補強材として打ち込み、切羽掘削後こ
の部分に建込んだ鋼製支保工By the way, in conventional tunnel excavation,
Each time a predetermined length of excavation is carried out, rock bolts or steel pipes are driven horizontally or diagonally downward toward the tunnel side at the lower end positions of both sides of the face as a reinforcing material, and after the face is excavated, steel support work built in this part.
【0004】の脚部近辺の地盤の補強をしている。The ground near the legs is reinforced.
【0005】[0005]
【発明が解決しようとする課題】上記従来のような補強
材では、その補強材打ち込み施工が吹付けコンクリート
や鋼製支保工建込み後に施工されるため、既に天端沈下
及び地表沈下大半が生じた後となり、ベンチカット工法
などのように上半部と下半部とを交互に掘削してゆくト
ンネル掘削などにおいて補強材の施工時には既に天端沈
下や地表沈下の大半が生じた後になっており、そのため
この方法では下半掘削による沈下低減が主とならざるを
得ず、沈下抑制の効果が半減しているのが現状である。In the above-mentioned conventional reinforcing material, since the reinforcing material driving-in construction is carried out after the construction of shotcrete or steel support construction, most of the crown and subsidence have already occurred. After that, when the reinforcement material is installed during tunnel excavation, which involves excavating the upper and lower halves alternately, such as the bench-cut method, most of the top and subsidence has already occurred. Therefore, in this method, it is unavoidable to reduce the settlement by the lower half excavation, and the effect of settlement suppression is halved at present.
【0006】[0006]
【課題を解決するための手段】この発明は、トンネル上
半部1の切羽2の左右における支保工3の脚部の支持部
分に、切羽1の前方に向かって斜め下向きに先行フット
ボルト4を打ち込み、前記打ち込む先行フットボルト4
は、支保工3の建込みスパン毎に水平面からの前後方向
の傾斜角α,α’及び鉛直面からの左右方向の傾斜角
θ,θ’を交互に変化させて設置するようにしたトンネ
ル脚部の先行補強方法を提案するものである。According to the present invention, leading foot bolts 4 are provided obliquely downward toward the front of the cutting face 1 on the supporting portions of the legs of the support 3 on the left and right sides of the cutting face 2 of the upper half 1 of the tunnel. Driving, preceding foot bolt 4 to be driven
Is a tunnel leg that is installed by alternately changing the inclination angles α, α ′ in the front-rear direction from the horizontal plane and the inclination angles θ, θ ′ in the left-right direction from the vertical plane for each construction span of the support work 3. This is to propose a method of preceding reinforcement of a part.
【0007】[0007]
【作用】先行フットボルト4をトンネル上半部1の切羽
2の左右における支保工3の脚部の支持部分に切羽前方
に向かって斜め下向きに打ち込むことによって、切羽の
掘削前においてその前方地山を補強し、上半部1の掘削
時の天端及び地表の沈下及び下半部5の掘削時の地表の
沈下を抑制して沈下量を低減する。Operation: By driving the preceding foot bolts 4 into the supporting portions of the legs of the supporting members 3 on the right and left sides of the cutting face 2 of the upper half 1 of the tunnel diagonally downward toward the front of the cutting face, before the excavation of the cutting face, the ground ahead of it is excavated. To suppress the top and ground subsidence during the excavation of the upper half 1 and the subsidence of the ground during the excavation of the lower half 5 to reduce the subsidence amount.
【0008】先行フットボルト4を角度を変えて多角的
に打ち込むことにより、地盤に作用する各種方向の圧力
を確実に受けとめて地山を拘束し、縫地として沈下低減
の効果が高められる。By driving the leading foot bolt 4 in various angles by driving it in various directions, pressures in various directions acting on the ground are surely received, the ground is restrained, and the effect of sinking reduction is enhanced as the sewing ground.
【0009】[0009]
【実施例】NATM工法によるトンネル掘削工事におい
て、トンネル上半部1の切羽2の左右における鋼製門型
支保工3の脚部の支持部分に切羽前方に向かって斜め下
向きにロックボルトからなる先行フットボルト4を打ち
込む。[Example] In the tunnel excavation work by the NATM method, a leading portion of rock bolts is provided diagonally downward toward the front of the cutting face on the supporting portions of the legs of the steel gate-type support 3 on the left and right sides of the cutting face 2 of the upper half 1 of the tunnel. Drive in the foot bolt 4.
【0010】打ち込む先行フットボルト4は、通常ロッ
クボルトとして使用する3〜4m程度の長さのものを用
い、図2及び図3に示すように支保工4の建込みスパン
毎に水平面からの前後方向の傾斜角α,α’及び鉛直面
からの左右方向の傾斜角θ,θ’を交互に変化させて設
置する(例えば、α=15°,α’=30°,θ=30°,
θ’=40°等)。As the preceding foot bolt 4 to be driven, one having a length of about 3 to 4 m which is usually used as a lock bolt is used, and as shown in FIGS. The installation is performed by alternately changing the inclination angles α, α'of the direction and the inclination angles θ, θ'of the horizontal direction from the vertical plane (for example, α = 15 °, α '= 30 °, θ = 30 °,
θ '= 40 ° etc.).
【0011】このように先行フットボルト4を角度を変
えて多角的に打ち込むことにより、地盤に作用する各種
方向の圧力を確実に受けとめて地山を拘束し、縫地とし
て沈下低減の効果を高め、沈下量を低減することができ
る。As described above, by driving the leading foot bolt 4 in various angles by driving it in a polygonal manner, pressures in various directions acting on the ground are surely received to restrain the ground and enhance the effect of reducing the sinking as the sewing ground. The amount of subsidence can be reduced.
【0012】先行フットボルト4は、設置スパン毎に左
右1本とすることが基本であるが、施工するトンネルが
大断面である場合、軟弱な砂質地盤である場合、あるい
は土被りが小さくて許容沈下量が小さい場合等の地盤の
強化が通常より必要な施工条件に応じて2本以上に増設
する。The leading foot bolt 4 is basically one on each side for each installation span. However, if the tunnel to be constructed has a large cross section, is soft sandy ground, or has a small overburden. If the allowable subsidence is small, the ground will be strengthened by adding two or more depending on the construction conditions that are usually required.
【0013】このように先行フットボルト4を一カ所あ
たり複数本とする場合には、それぞれ設置高さを30〜50
cm程度違えて複数段に打ち込む。When a plurality of leading foot bolts 4 are provided at one place in this way, the installation height is 30 to 50, respectively.
Drive in multiple steps with a difference of about cm.
【0014】[0014]
【発明の効果】トンネル上半部の切羽の左右における支
保工の脚部の支持部分に切羽前方に向かって斜め下向き
に打ち込むことによって、切羽の掘削前においてその前
方地山を補強し、上半部の掘削時の天端及び地表の沈下
及び下半部の掘削時の地表の沈下を抑制して沈下量を低
減することができる。[Effects of the Invention] By driving the legs of the supporting structure on the left and right sides of the face in the upper half of the tunnel diagonally downward toward the front of the face, the ground in front of the face is reinforced before excavation of the face, and the upper half is cut. The amount of subsidence can be reduced by suppressing the subsidence of the top and the ground during excavation of a part and the subsidence of the ground during the excavation of the lower half.
【0015】先行フットボルトを角度を変えて多角的に
打ち込むことにより、地盤に作用する各種方向の圧力を
確実に受けとめて地山を拘束し、縫地として沈下低減の
効が高めることができる。By driving the leading foot bolts in various angles with various angles, pressures in various directions acting on the ground can be reliably received and the ground can be restrained, and the effect of sinking reduction can be enhanced as a stitch.
【図1】こ発明の施工状態を示す追加側面図。FIG. 1 is an additional side view showing a construction state of the present invention.
【図2】この発明の施工状態を示す横断正面図。FIG. 2 is a cross-sectional front view showing a construction state of the present invention.
【図3】この発明のフットボルトの打ち込み態様を示す
縦断側面図。FIG. 3 is a vertical sectional side view showing a driving mode of a foot bolt of the present invention.
1 トンネル上半部 2 切羽 3 支保工 4 先行フットボルト 5 トンネル下半部 1 upper half of the tunnel 2 face 3 support work 4 Leading foot bolt 5 Lower part of tunnel
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) E21D 9/04 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) E21D 9/04
Claims (2)
製門型支保工の脚部の支持部分に切羽前方に向かって斜
め下向きに先行フットボルトを打ち込むことを特徴とす
るトンネル脚部の先行補強方法。1. A leading leg of a tunnel leg portion, characterized in that front foot bolts are driven diagonally downward toward the front face of the face into the supporting portions of the leg portions of the steel gate-type support work on the left and right sides of the face face in the upper half of the tunnel. Reinforcement method.
製門型支保工の脚部の支持部分に切羽前方に向かって斜
め下向きに先行フットボルトを打ち込み、前記打ち込む
先行フットボルトは、支保工の建込みスパン毎に水平面
からの前後方向の傾斜角及び鉛直面からの左右方向の傾
斜角を交互に変化させて設置することを特徴とするトン
ネル脚部の先行補強方法。2. A front foot bolt is driven diagonally downward toward the front of the face into the supporting portions of the legs of the steel portal support on the left and right of the face in the upper half of the tunnel. A method for preliminarily reinforcing a tunnel leg portion, characterized in that the inclination angle in the front-back direction from the horizontal plane and the inclination angle in the left-right direction from the vertical plane are alternately changed for each span of construction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14078294A JP3436973B2 (en) | 1994-05-31 | 1994-05-31 | Prior reinforcement method of tunnel leg |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14078294A JP3436973B2 (en) | 1994-05-31 | 1994-05-31 | Prior reinforcement method of tunnel leg |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07324586A JPH07324586A (en) | 1995-12-12 |
JP3436973B2 true JP3436973B2 (en) | 2003-08-18 |
Family
ID=15276624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14078294A Expired - Fee Related JP3436973B2 (en) | 1994-05-31 | 1994-05-31 | Prior reinforcement method of tunnel leg |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3436973B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100418133B1 (en) * | 2000-10-09 | 2004-02-14 | 에스케이건설 주식회사 | Small Section Excavating Method of a Tunnel |
JP6558904B2 (en) * | 2015-01-30 | 2019-08-14 | 株式会社大林組 | Pile guide guide member and tunnel ground support method |
JP6857097B2 (en) * | 2017-07-11 | 2021-04-14 | 鹿島建設株式会社 | How to build a tunnel |
JP7403116B2 (en) * | 2019-08-06 | 2023-12-22 | 前田建設工業株式会社 | Ground reinforcement method |
-
1994
- 1994-05-31 JP JP14078294A patent/JP3436973B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH07324586A (en) | 1995-12-12 |
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