JPH04221115A - Stable construction method of tunnel working face - Google Patents
Stable construction method of tunnel working faceInfo
- Publication number
- JPH04221115A JPH04221115A JP40507190A JP40507190A JPH04221115A JP H04221115 A JPH04221115 A JP H04221115A JP 40507190 A JP40507190 A JP 40507190A JP 40507190 A JP40507190 A JP 40507190A JP H04221115 A JPH04221115 A JP H04221115A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- tunnel
- working face
- chemical
- hole
- 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.)
- Granted
Links
- 238000010276 construction Methods 0.000 title description 8
- 239000000835 fiber Substances 0.000 claims abstract description 38
- 239000000126 substance Substances 0.000 claims abstract description 34
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 239000007787 solid Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明はトンネル切羽の安定工法
に係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stabilizing a tunnel face.
【０００２】0002
【従来の技術】一般に、土被りの薄い未固結地山におけ
るトンネルでは、切羽の安定性や地表面の沈下が問題と
なることが多い。従来都市ナトムトンネルの切羽の安定
工法として薬液注入工法が行なわれることが多い。この
薬液注入工法においてはトンネル切羽の周囲を広範囲に
亘って地盤改良薬液を浸透または脈状注入して地盤を改
良する場合が多い。2. Description of the Related Art Generally, tunnels in unconsolidated mountains with a thin earth cover often have problems with the stability of the face and subsidence of the ground surface. Conventionally, chemical injection is often used as a method of stabilizing the face of urban natom tunnels. In this chemical injection method, the ground is often improved by infiltrating or injecting a ground improvement chemical over a wide area around the tunnel face.
【０００３】0003
【発明が解決しようとする課題】しかしながらトンネル
切羽前方を薬液注入によって改良する時、（イ）脈状ま
たは浸透注入においては、かなり広範囲に注入するため
に薬液が多量に必要であり、またその改良効果は信頼性
に欠ける。（ロ）高圧噴射薬液注入工法によって切羽前
方にコラム状またはパネル状の先受固結体を形成すると
き、同固結体を薄くすると、引張強度が弱いために、切
羽の安定性はあまり向上しないしまた厚くすると不経済
となる。[Problems to be Solved by the Invention] However, when improving the front part of a tunnel face by injecting chemical liquid, (a) In pulsed or penetrating injection, a large amount of chemical liquid is required to inject a fairly wide area; The effect is unreliable. (b) When forming column-shaped or panel-shaped pre-consolidated bodies in front of the face using the high-pressure injection chemical injection method, if the solid bodies are made thinner, the stability of the face will not improve much because the tensile strength will be weak. If you don't do it or make it thicker, it will be uneconomical.
【０００４】本発明は前記従来技術の有する問題点に鑑
みて提案されたもので、構造的に信頼性に富み、経済性
に優れたトンネル切羽の安定工法を提供する点にある。The present invention has been proposed in view of the problems of the prior art, and its object is to provide a method for stabilizing a tunnel face that is structurally reliable and economical.
【０００５】[0005]
【課題を解決するための手段】前記の目的を達成するた
め、本発明に係るトンネル切羽の安定工法によれば、ト
ンネル切羽前方にフアイバー入りの地盤改良薬液を注入
し、トンネル切羽前方の天端にアーチ状のフアイバー混
合固結層を形成するものである。[Means for Solving the Problems] In order to achieve the above object, according to the method for stabilizing a tunnel face according to the present invention, a ground improvement chemical solution containing fibers is injected in front of the tunnel face, and the top of the tunnel face in front of the tunnel face is This method forms an arch-shaped fiber mixed consolidated layer.
【０００６】[0006]
【作用】本発明によれば、トンネル切羽前方の地山の先
受工的な補助工法として地盤改良薬液を注入してトンネ
ル天端前方に薄いシエルアーチ状の固結体を形成するの
に当り、前記薬液中にフアイバーを混入するため、前記
固形体の引張強度が増加し、従って固結体が薄くても先
受工として効果的に機能し、切羽の安定性を増大し、地
表沈下を抑制するものである。[Operation] According to the present invention, as an auxiliary construction method for preliminary construction of the ground in front of the tunnel face, a soil improvement chemical solution is injected to form a thin shell-arch shaped solid body in front of the tunnel crown. Since the fibers are mixed into the chemical solution, the tensile strength of the solid body increases, so even if the solid body is thin, it functions effectively as a preliminary construction, increases the stability of the face, and prevents ground subsidence. It is something to suppress.
【０００７】[0007]
【実施例】トンネルＡの切羽Ｃより斜め前方地山に指向
して削孔機械１でフアイバー散布孔２を削孔する。なお
図示の実施例では前記削孔機械１より圧力水を噴射して
削孔する（図６参照）図中Ｂは支保工である。前記と同
様にしてフアイバー散布孔２の隣に同孔２と平行して薬
液噴射孔３を削孔する。（図７参照）次いで前記フアイ
バー散布孔２内にフアイバー散布用ロツド４を挿入し、
圧縮空気によって同ロツド４の先端よりフアイバーａを
散布しながら引抜き前記孔２内にフアイバーａを充填す
る。（図８及び図３参照）図中５はフアイバー混入用ホ
ツパー、６はフアイバー供給管、７は圧縮空気供給管で
ある。[Embodiment] A fiber dispersion hole 2 is drilled by a drilling machine 1 toward the ground obliquely forward from the face C of a tunnel A. In the illustrated embodiment, the hole is drilled by injecting pressurized water from the hole-drilling machine 1 (see FIG. 6). B in the figure is a support. In the same manner as described above, a chemical injection hole 3 is drilled next to and parallel to the fiber dispersion hole 2. (See FIG. 7) Next, insert the fiber dispersion rod 4 into the fiber dispersion hole 2,
The fibers a are spread from the tip of the rod 4 using compressed air and are pulled out to fill the holes 2 with the fibers a. (See FIGS. 8 and 3) In the figure, 5 is a hopper for mixing fibers, 6 is a fiber supply pipe, and 7 is a compressed air supply pipe.
【０００８】次いで薬液噴射孔３内に薬液噴射用ロツド
８を挿入し、同ロツド８の先端よりフアイバー充填側に
指向して地盤改良薬液ｂを噴射する。このとき同薬液ｂ
とフアイバーａと切羽の土壌が攪合攪拌される。（図９
、及び図１、図２参照）前記ロツド８を一定速度で引抜
きながらフアイバー混入固結壁９を造成する。（図１０
参照）かくしてトンネル掘削の進行に伴って、一定の掘
削長ごとに前記フアイバー混入固結壁９を造成し、切羽
Ｃの安定を図りながら掘削していく。（図１１及び図５
参照）かくして高強度のフアイバー混入固結壁９のアー
チ状シエルをトンネル切羽前方に形成し、切羽の安定性
を確保し、地表沈下の抑制を行なうものである。 （
図４参照）なお前記地盤改良薬液として水ガラスとセメ
ント水溶液を使用した場合、その固結体の一軸圧縮強度
は３０Ｋｇ／Ｃｍ２ 、引張強度は４Ｋｇ／Ｃｍ２ 程
度である。一方、フアイバーを混入した場合、圧縮強度
は殆んど変らないが、引張強度は６Ｋｇ／Ｃｍ２ とな
り、１．５倍程度増加する。[0008] Next, a chemical liquid injection rod 8 is inserted into the chemical liquid injection hole 3, and the soil improvement chemical liquid b is injected from the tip of the rod 8 toward the fiber filling side. At this time, the same chemical solution b
The fiber A and the soil at the face are mixed and agitated. (Figure 9
, and FIGS. 1 and 2) The fiber-containing consolidated wall 9 is created while pulling out the rod 8 at a constant speed. (Figure 10
(See) Thus, as the tunnel excavation progresses, the fiber-containing consolidated wall 9 is created at every predetermined excavation length, and the excavation is carried out while stabilizing the face C. (Figures 11 and 5
In this way, an arched shell of high-strength fiber-containing solidified wall 9 is formed in front of the tunnel face, ensuring stability of the face and suppressing ground subsidence. (
(See FIG. 4) When water glass and cement aqueous solution are used as the ground improvement chemicals, the unconfined compressive strength of the solidified material is about 30 Kg/Cm2, and the tensile strength is about 4 Kg/Cm2. On the other hand, when fibers are mixed, the compressive strength hardly changes, but the tensile strength increases by about 1.5 times to 6 Kg/Cm2.
【０００９】[0009]
【発明の効果】本発明は前記したように、トンネル切羽
前方にフアイバー入りの地盤改良薬液を注入して、トン
ネル切羽前方の天端にアーチ状のフアイバー、固結層を
形成することによって、切羽の安定性を確保し、地表沈
下を抑制しうるものである。また前記固形層を構成する
地盤改良薬液はフアイバーが混入されたことによって引
張強度が増大し、固結体が薄くても十分に切羽の安定性
を保持しうるとともに、地盤改良薬液の使用量を節減し
うるものである。Effects of the Invention As described above, the present invention injects a soil improvement chemical containing fibers into the front of the tunnel face to form arch-shaped fibers and a consolidated layer at the top of the front of the tunnel face. It is possible to ensure the stability of the ground and suppress ground subsidence. In addition, the tensile strength of the soil improvement chemical that makes up the solid layer increases due to the inclusion of fibers, and even if the solid layer is thin, the stability of the face can be sufficiently maintained, and the amount of soil improvement chemical used can be reduced. This can save money.
【００１０】請求項２の発明は、トンネル切羽前方にフ
アイバー散布孔と同孔に隣接して平行に薬液噴射孔を掘
削し、前記散布孔にフアイバーを散布充填したのち、前
記薬液噴射孔に薬液噴射用ロツドを挿入し、前記フアイ
バー散布孔側に地盤改良薬液を高圧噴射しながら前記ロ
ツドを引抜くことによって、比較的簡単な高圧注入噴射
装置を用いて、少量の地盤改良薬液での限定注入が可能
となり、施工性と経済性が向上される。[0010] In the invention of claim 2, a chemical liquid injection hole is excavated in parallel to and adjacent to the fiber dispersion hole in front of the tunnel face, and after the fiber is sprayed and filled into the said distribution hole, the chemical liquid is injected into the chemical liquid injection hole. By inserting an injection rod and pulling out the rod while injecting a high-pressure soil improvement chemical into the fiber distribution hole side, a relatively simple high-pressure injection device can be used to perform limited injection with a small amount of soil improvement chemical. This makes it possible to improve workability and economic efficiency.
【図１】本発明に係るトンネル切羽の安定工法の一実施
例の実施状況を示す横断平面図である。FIG. 1 is a cross-sectional plan view showing the implementation status of an embodiment of the tunnel face stabilization method according to the present invention.
【図２】前記安定工法の実施状況を示す縦断面図である
。FIG. 2 is a longitudinal sectional view showing the state of implementation of the stable construction method.
【図３】前記工程におけるフアイバー充填工程を示す横
断平面図である。FIG. 3 is a cross-sectional plan view showing the fiber filling step in the process.
【図４】本発明の工法が適用されたトンネルの縦断面図
である。FIG. 4 is a longitudinal sectional view of a tunnel to which the construction method of the present invention is applied.
【図５】本発明の工法が適用されたトンネルの縦断側面
図である。FIG. 5 is a vertical sectional side view of a tunnel to which the construction method of the present invention is applied.
【図６】本発明の工法の最初の工程を示す縦断側面図で
ある。FIG. 6 is a longitudinal side view showing the first step of the construction method of the present invention.
【図７】図６の工程の次工程を示す縦断側面図である。7 is a longitudinal sectional side view showing the next step after the step of FIG. 6. FIG.
【図８】図７の工程の次工程を示す縦断側面図である。8 is a longitudinal sectional side view showing a step subsequent to the step of FIG. 7. FIG.
【図９】図８の工程の次工程を示す縦断側面図である。9 is a longitudinal sectional side view showing the next step after the step of FIG. 8. FIG.
【図１０】図９の工程の次工程を示す縦断側面図である
。10 is a longitudinal side view showing a step subsequent to the step of FIG. 9. FIG.
【図１１】図１０の工程の次工程を示す縦断側面図であ
る。11 is a longitudinal side view showing the next step after the step of FIG. 10. FIG.
Ａ トンネル Ｃ 切羽 ａ フアイバー ｂ 地盤改良薬液 ２ フアイバー散布孔 ３ 薬液噴射孔 ４ フアイバー散布用ロツド ８ 薬液噴射用ロツド ９ フアイバー混入固結壁 A Tunnel C Face a Fiber b Ground improvement chemicals 2 Fiber distribution hole 3 Chemical injection hole 4. Rod for fiber dispersion 8 Rod for chemical liquid injection 9 Fiber mixed consolidated wall
Claims (2)
地盤改良薬液を注入し、トンネル切羽前方の天端にアー
チ状のフアイバー混合固結層を形成することを特徴とす
るトンネル切羽の安定工法。1. A method for stabilizing a tunnel face, characterized by injecting a soil improvement chemical containing fibers in front of the tunnel face, and forming an arch-shaped fiber-mixed consolidated layer at the top of the front of the tunnel face.
と同孔に隣接して平行に薬液噴射孔を掘削し、前記散布
孔にフアイバーを散布充填したのち、前記薬液噴射孔に
薬液噴射用ロツドを挿入し、前記フアイバー散布孔側に
地盤改良薬液を高圧噴射しながら前記ロツドを引抜くこ
とを特徴とする請求項１記載のトンネル切羽の安定工法
。2. Drilling a chemical liquid injection hole adjacent to and parallel to the fiber dispersion hole in front of the tunnel face, and after scattering and filling the fiber distribution hole with the fiber, inserting a chemical liquid injection rod into the chemical liquid injection hole. 2. The method for stabilizing a tunnel face according to claim 1, wherein said rod is pulled out while injecting a soil improvement chemical at high pressure to said fiber dispersion hole side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2405071A JPH0819820B2 (en) | 1990-12-21 | 1990-12-21 | Stabilization method of tunnel face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2405071A JPH0819820B2 (en) | 1990-12-21 | 1990-12-21 | Stabilization method of tunnel face |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04221115A true JPH04221115A (en) | 1992-08-11 |
| JPH0819820B2 JPH0819820B2 (en) | 1996-02-28 |
Family
ID=18514712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2405071A Expired - Lifetime JPH0819820B2 (en) | 1990-12-21 | 1990-12-21 | Stabilization method of tunnel face |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0819820B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50152528A (en) * | 1974-05-28 | 1975-12-08 |
-
1990
- 1990-12-21 JP JP2405071A patent/JPH0819820B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50152528A (en) * | 1974-05-28 | 1975-12-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0819820B2 (en) | 1996-02-28 |
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