JP4733613B2 - Underground continuous wall construction method - Google Patents

Underground continuous wall construction method Download PDF

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JP4733613B2
JP4733613B2 JP2006286328A JP2006286328A JP4733613B2 JP 4733613 B2 JP4733613 B2 JP 4733613B2 JP 2006286328 A JP2006286328 A JP 2006286328A JP 2006286328 A JP2006286328 A JP 2006286328A JP 4733613 B2 JP4733613 B2 JP 4733613B2
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continuous wall
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JP2008101429A (en
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静夫 生田
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株式会社ランド・クリエイティブ
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Description

本発明は、チェーンコンベアカッタを用いる地中連続壁構築方法に関するものである。   The present invention relates to an underground continuous wall construction method using a chain conveyor cutter.

大深度（たとえば、５０ｍ程度）の地中連続壁を構築するには、アースオーガを用いた円柱を連続的に構築する柱列壁工法と、ＴＲＤ工法と呼ばれるチェーンソー型掘削機を用いる技術とが知られている。柱列壁工法では、壁の連続性すなわち遮水性が不良になりやすいなど、掘削しやすい地盤構成であっても、良好な連続壁を構築しにくい。そこで本発明は、チェーンを使用する新たな地中連続壁の構築方法に関する。なお、このような大深度の地中連続壁は、たとえば、地下ダムを構築する際に、必要となることがある。   In order to construct a deep underground wall (for example, about 50 m), a column wall method for continuously constructing a column using an earth auger and a technique using a chain saw type excavator called a TRD method are used. Are known. In the columnar wall construction method, it is difficult to construct a good continuous wall even if the ground structure is easy to excavate, such as the continuity of the wall, that is, the water shielding property is likely to be poor. Therefore, the present invention relates to a new underground continuous wall construction method using a chain. Such a deep underground continuous wall may be required, for example, when constructing an underground dam.

以下、図９を参照しながら、従来の連続壁工法（ＴＲＤ工法）について簡単に説明する。図９に示すように、ＴＲＤ工法は、地面１上において、水平な進行方向Ｎ１へＴＲＤ施工機２を進めることにより実施される。   Hereinafter, the conventional continuous wall method (TRD method) will be briefly described with reference to FIG. As shown in FIG. 9, the TRD method is carried out by advancing the TRD construction machine 2 in the horizontal traveling direction N1 on the ground 1.

ＴＲＤ施工機２は、地面１から５０ｍ程度の目標深さＨまで至る長尺のチェーンソー３を備えており、チェーンソー３は、ＴＲＤ施工機２に設けられる油圧ジャッキ（図示せず）により矢印Ｎ１方向へ押し付けられ、地面１から５０ｍ程度の目標深さＨまで至る地層を横引き掘削することになっている。横引き掘削する場合、目標深さＨが大きくなればなるほど、掘削しやすい地盤構成であったとしても、チェーンソー３の支点からの腕の長さが大きくなることになり、巨大な荷重が必要になる。このため、ＴＲＤ施工機２は、専用のベースマシンを必須とし、汎用機を転用することができない。したがって、機械損料及び連続壁の単位面積あたりの構築コストが高くなるという問題がある。   The TRD construction machine 2 includes a long chain saw 3 from the ground 1 to a target depth H of about 50 m. The chain saw 3 is in the direction of arrow N1 by a hydraulic jack (not shown) provided on the TRD construction machine 2. It is supposed to be excavated from the ground 1 to the target depth H of about 50 m. When horizontal excavation is performed, the longer the target depth H is, the greater the length of the arm from the fulcrum of the chainsaw 3 becomes, even if the ground configuration is easier to excavate. Become. For this reason, the TRD construction machine 2 requires a dedicated base machine and cannot use a general-purpose machine. Therefore, there is a problem that the construction cost per unit area of the mechanical loss and the continuous wall becomes high.

さらに重要な問題点として、地面１から５０ｍ程度の目標深さＨまで至る地層の一部に、固い地層４が含まれていると、ＴＲＤ施工機２に対する抵抗がきわめて大となって、横引き掘削は難航必至となり、工事の中断や断念を余儀なくされてしまう。こうなると、従来技術は実用に供し得ないといわざるを得ない。   More importantly, if the hard stratum 4 is included in a part of the stratum from the ground 1 to the target depth H of about 50 m, the resistance to the TRD construction machine 2 becomes extremely large, and the horizontal pulling is performed. Excavation becomes inevitable, and construction is interrupted and abandoned. In this case, it is necessary to say that the prior art cannot be put to practical use.

加えて、従来技術では、チェーンソー３により掘削された掘削土は、地上へ搬出され、大量の産業廃棄物として処理される。
特開２００５−３３０７４７号公報 In addition, in the prior art, excavated soil excavated by the chainsaw 3 is carried to the ground and processed as a large amount of industrial waste.
JP 2005-330747 A

そこで本発明は、チェーンコンベアカッタを用いる地中連続壁構築方法において、掘削工程を合理化し、固い地層が含まれる場合であっても、低コストで高品質の地中連続壁を構築できる方法を提供することを目的とする。   Therefore, the present invention provides a method for streamlining the excavation process in a method for constructing an underground continuous wall using a chain conveyor cutter, and capable of constructing a high-quality underground continuous wall at a low cost even when a hard formation is included. The purpose is to provide.

第１の発明に係る地中連続壁の構築方法は、地面から目標深さに至る途中に第１深さを設定する工程と、地面から第１深さまでを第１チェーンコンベアカッタを用いて垂直方向に掘削してほぐすとともに、その結果生じた掘削土の少なくとも一部を地中に残置する先行掘削工程と、先行掘削工程の後に、地面から目標深さに至りうる長尺チェーンコンベアカッタの下端部を残置された掘削土中において移動させて第１深さまで至り、さらに、第１深さから目標深さまでを垂直方向に掘削する後続掘削工程と、掘削土中に固化液を吐出し地中において目標深さに至る地中連続壁を構築する構築工程とを含む。   In the construction method of the underground continuous wall according to the first invention, the first depth is set on the way from the ground to the target depth, and the vertical distance from the ground to the first depth using the first chain conveyor cutter. The lower end of the long chain conveyor cutter that can reach the target depth from the ground after the preceding excavation step and the preceding excavation step that leaves the resulting excavated soil left underground, In the excavated soil left behind to reach the first depth and then excavate vertically from the first depth to the target depth, and discharge the solidified liquid into the excavated soil And a construction step of constructing a continuous underground wall reaching a target depth.

この構成における、先行掘削工程において、第１チェーンコンベアカッタは、地中を横引き掘削するのではなく、地中を縦に掘削するだけである。第１チェーンコンベアカッタに横向きに作用する荷重は、従来技術のそれよりもはるかに小さく、第１チェーンコンベアカッタは、専用ベースマシンではなく、汎用機（たとえば、汎用杭打機等）により支持すれば足りるので、コストを削減できる。また、第１、長尺の両チェーンコンベアカッタは、第１の場合（その側面を固い地層に押し付ける）よりも、第２の場合（その下端部を固い地層を貫く向きに掘削する）方が、高い掘削能力を発揮でき、まさに、本発明では第２の場合に該当するから、効率よく掘削工程を実施できる。   In the preceding excavation step in this configuration, the first chain conveyor cutter does not excavate the ground horizontally but only excavates the underground vertically. The load acting laterally on the first chain conveyor cutter is much smaller than that of the prior art, and the first chain conveyor cutter is supported not by a dedicated base machine but by a general purpose machine (for example, a general purpose pile driver). Costs can be reduced because it is sufficient. In addition, the first and the long chain conveyor cutters are both in the second case (excavating the lower end thereof in a direction penetrating the hard formation) rather than in the first case (pressing the side surface against the hard formation). Since the present invention corresponds to the second case, the excavation process can be carried out efficiently.

先行掘削工程において、掘削土を地中に残置している。これにより、残置した掘削土を産業廃棄物として処分する必要がなくなり、環境への悪影響を低減できる。また、後続掘削工程において、長尺チェーンコンベアカッタが地面から第１深さまで移動する際に、残置された掘削土は、ほとんど抵抗とならないから、長尺チェーンコンベアカッタはスムーズに移動できる。このとき、長尺チェーンコンベアカッタに横向きに作用する荷重は、従来技術のそれよりもはるかに小さく、長尺チェーンコンベアカッタは、専用ベースマシンではなく、汎用機（たとえば、汎用杭打機や大型クレーン等）により支持すれば足りるので、コストを削減できる。   In the preceding excavation process, excavated soil is left in the ground. This eliminates the need to dispose the left excavated soil as industrial waste, thereby reducing adverse environmental effects. Further, in the subsequent excavation process, when the long chain conveyor cutter moves from the ground to the first depth, the remaining excavated soil hardly resists, so the long chain conveyor cutter can move smoothly. At this time, the load acting laterally on the long chain conveyor cutter is much smaller than that of the prior art, and the long chain conveyor cutter is not a dedicated base machine, but a general purpose machine (for example, a general purpose pile driver or a large size machine). The cost can be reduced because it is sufficient to support it with a crane or the like.

さらに、構築工程において、固化液が吐出される際、残置された掘削土は、良質な骨材として活用することができ、材料の無駄を省けるだけでなく、構築される連続壁の品質向上にも資することができる。   Furthermore, when the solidification liquid is discharged in the construction process, the remaining excavated soil can be used as a high-quality aggregate, not only to save material waste, but also to improve the quality of the continuous wall that is constructed. Can also help.

後続掘削工程において、長尺チェーンコンベアカッタが掘削すべき実質的な深さは、第１深さから目標深さまでのみであって、迅速に掘削を実施できる。   In the subsequent excavation process, the substantial depth to be excavated by the long chain conveyor cutter is only from the first depth to the target depth, and the excavation can be performed quickly.

第２の発明に係る地中連続壁の構築方法では、後続掘削工程と構築工程とは、長尺チェーンコンベアカッタにより連続的に実施される。   In the underground continuous wall construction method according to the second invention, the subsequent excavation step and the construction step are continuously performed by a long chain conveyor cutter.

この構成により、無駄なく短時間で目標深さに至る地中連続壁を構築できる。   With this configuration, it is possible to construct a continuous underground wall that reaches the target depth in a short time without waste.

第３の発明に係る地中連続壁の構築方法では、先行掘削工程において、水又は圧縮空気を注入する。   In the underground continuous wall construction method according to the third invention, water or compressed air is injected in the preceding excavation step.

第４の発明に係る地中連続壁の構築方法では、先行掘削工程において、水にベントナイト又はセメントを混合したものを注入する。   In the construction method of the underground continuous wall according to the fourth invention, in the preceding excavation step, water mixed with bentonite or cement is injected.

これらの構成により、土質や地下水の状況に応じて、残置される掘削土の性状を調整できる。   With these configurations, it is possible to adjust the properties of the excavated soil that remains depending on the soil quality and groundwater conditions.

第５の発明に係る地中連続壁の構築方法では、先行掘削工程と後続掘削工程とは、第１チェーンコンベアカッタの掘削位置と、長尺チェーンコンベアカッタの掘削位置とをずらして並行して実施される。   In the underground continuous wall construction method according to the fifth aspect of the invention, the preceding excavation step and the subsequent excavation step are performed in parallel by shifting the excavation position of the first chain conveyor cutter and the excavation position of the long chain conveyor cutter. To be implemented.

この構成により、先行掘削工程と後続掘削工程とを連続的に実施できるから、地中連続壁の構築完成までの時間を短縮できる。   With this configuration, the preceding excavation step and the subsequent excavation step can be continuously performed, so that the time until the construction of the underground continuous wall can be shortened.

本発明によれば、掘削工程が改善され、固い地層が含まれる場合であっても、低コストで高品質の地中連続壁を構築でき、さらに、掘削土を地中に残置することにより、産業廃棄物を削減するとともに、掘削土を骨材として活用できる。   According to the present invention, even when the excavation process is improved and a hard formation is included, a high-quality underground continuous wall can be constructed at a low cost, and further, by leaving excavated soil in the ground, In addition to reducing industrial waste, excavated soil can be used as aggregate.

以下、図面を参照しながら、本発明の実施の形態を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

まず、本形態の地中連続壁の各構築工程を具体的に説明するに先立ち、図８を参照しながら、第１チェーンコンベアカッタ１１と長尺チェーンコンベアカッタ１３の組立例を説明する。なお、以下の組立例は一例に過ぎず、両チェーンコンベアカッタを、本発明の構築方法を実施できるように組み立てる限りにおいて、種々変更して差し支えない。   First, prior to concrete description of each construction process of the underground continuous wall of this embodiment, an assembly example of the first chain conveyor cutter 11 and the long chain conveyor cutter 13 will be described with reference to FIG. The following assembly examples are merely examples, and various modifications may be made as long as both chain conveyor cutters are assembled so that the construction method of the present invention can be implemented.

以下述べるように、この組立例では、第１チェーンコンベアカッタ１１及び長尺チェーンコンベアカッタ１３は、いずれも汎用の杭打機１０（たとえば、１５０トン クラス）と、チェーンコンベアカッタとの組み合わせで構成する。すなわち、従来技術では必須の、専用ベースマシンは、必要ない。もちろん、杭打機にかえて、大型クレーン等を用いても良い。   As will be described below, in this assembly example, each of the first chain conveyor cutter 11 and the long chain conveyor cutter 13 is a combination of a general-purpose pile driver 10 (for example, 150 ton class) and a chain conveyor cutter. To do. That is, a dedicated base machine, which is essential in the prior art, is not necessary. Of course, a large crane or the like may be used instead of the pile driver.

各チェーンコンベアカッタは、下端部において地中を掘削する下方折返部と、上端部に位置し駆動力が付与される上方折返部と、これらの折返部間を連結する複数のポストを備える。これらのポストは、通常同じ長さを有するので、ポストを継ぎ足してポストの個数を増やせば、チェーンコンベアカッタをより長くすることができる。いうまでもなく、チェーンコンベアカッタの周囲には、チェーンが巻回されており、このチェーンには、所定のピッチをあけて、地中を掘削する複数のビットが固定される。   Each chain conveyor cutter includes a lower folded portion that excavates the ground at the lower end, an upper folded portion that is located at the upper end and to which driving force is applied, and a plurality of posts that connect the folded portions. Since these posts usually have the same length, the chain conveyor cutter can be made longer if the posts are added to increase the number of posts. Needless to say, a chain is wound around the chain conveyor cutter, and a plurality of bits for excavating the ground at a predetermined pitch are fixed to the chain.

さて、本発明では、目標深さＨを５０ｍとし、第１深さＨ１及び第２深さＨ２をそれぞれ２５ｍとする。もちろん、これらの数値も一例に過ぎず、種々変更することができる。   In the present invention, the target depth H is 50 m, and the first depth H1 and the second depth H2 are each 25 m. Of course, these numerical values are merely examples, and various changes can be made.

図８（ａ）は、第１チェーンコンベアカッタ１１（掘削深さは、たとえば第１深さＨ１とする。）と、それを支持し昇降させる杭打機１０とを示す。第１チェーンコンベアカッタ１１は、上述のように、下方折返部１１ａと上方折返部１１ｂとを備える。   Fig.8 (a) shows the 1st chain conveyor cutter 11 (the digging depth shall be 1st depth H1, for example.) And the pile driving machine 10 which supports and raises / lowers it. As described above, the first chain conveyor cutter 11 includes the lower folded portion 11a and the upper folded portion 11b.

次に、図８（ｂ）〜図８（ｄ）を参照しながら、第１チェーンコンベアカッタ１１を長尺チェーンコンベアカッタ１３に変更する要領を説明する。まず、図８（ｂ）左側に示すように、ある位置で第１チェーンコンベアカッタ１１により第１深さＨ１まで地中を垂直下方へ掘削し、第１チェーンコンベアカッタ１１を下降させる。また、別の位置において、第２チェーンコンベアカッタ１２も同様に下降させる。   Next, a procedure for changing the first chain conveyor cutter 11 to the long chain conveyor cutter 13 will be described with reference to FIGS. 8 (b) to 8 (d). First, as shown on the left side of FIG. 8B, the first chain conveyor cutter 11 is excavated vertically downward to a first depth H1 by a first chain conveyor cutter 11 at a certain position, and the first chain conveyor cutter 11 is lowered. In another position, the second chain conveyor cutter 12 is also lowered.

図８（ｃ）に示すように、第１チェーンコンベアカッタ１１を上昇させて、下方折返部１１ａを取り外す。また、第２チェーンコンベアカッタ１２の上方折返部１２ｂを取り外す。   As shown in FIG.8 (c), the 1st chain conveyor cutter 11 is raised and the downward folding part 11a is removed. Moreover, the upper folding | turning part 12b of the 2nd chain conveyor cutter 12 is removed.

次に、杭打機１０を地面１上で移動させ、第１チェーンコンベアカッタ１１の下端部と第２チェーンコンベアカッタ１２の上端部とを位置合わせし、これらを連結する。これにより、長尺チェーンコンベアカッタ１３を組み立てることができ、長尺チェーンコンベアカッタ１３の下方折返部１２ａは、第１深さＨ１と第２深さＨ２の和、即ち、目標深さＨまで至ることができる。以上のようにすれば、一台の杭打機１０だけで、第１チェーンコンベアカッタ１１、長尺チェーンコンベアカッタ１３の両方を得ることができ、そのようにしても本発明に係る構築方法を適用できなくはない。   Next, the pile driver 10 is moved on the ground 1, the lower end portion of the first chain conveyor cutter 11 and the upper end portion of the second chain conveyor cutter 12 are aligned, and these are connected. Thereby, the long chain conveyor cutter 13 can be assembled, and the downward folding portion 12a of the long chain conveyor cutter 13 reaches the sum of the first depth H1 and the second depth H2, that is, the target depth H. be able to. If it carries out as mentioned above, both the 1st chain conveyor cutter 11 and the elongate chain conveyor cutter 13 can be obtained only with one pile driving machine 10, and even if it does in that way, the construction method concerning the present invention can be obtained. Not applicable.

しかしながら、作業効率を向上するために、図８（ａ）に示す第１チェーンコンベアカッタ１１と図８（ｄ）に示す長尺チェーンコンベアカッタ１３とは別々にして、これらを同時並行して使用することが望ましい。   However, in order to improve work efficiency, the first chain conveyor cutter 11 shown in FIG. 8A and the long chain conveyor cutter 13 shown in FIG. 8D are separately used and used in parallel. It is desirable to do.

なお、この組み立て要領は、一例に過ぎず、可能であれば、はじめから長尺のチェーンコンベアカッタを用意するなど種々変更できる。また、作業完了後に長尺コンベアカッタを撤収するには、上述とほぼ反対の手順によればよい。   This assembling procedure is merely an example, and if possible, various changes can be made such as preparing a long chain conveyor cutter from the beginning. Further, in order to withdraw the long conveyor cutter after the work is completed, a procedure almost opposite to that described above may be followed.

次に、図１〜図７を参照しながら、本形態の地中連続壁の各構築工程を具体的に説明する。   Next, each construction process of the underground continuous wall of this embodiment will be specifically described with reference to FIGS.

まず、地面から目標深さＨに至る途中に第１深さＨ１を設定する。本形態では、上述したように、目標深さＨ＝５０ｍ、第１深さＨ１、第２深さＨ２＝２５ｍである。   First, the first depth H1 is set on the way from the ground to the target depth H. In this embodiment, as described above, the target depth H = 50 m, the first depth H1, and the second depth H2 = 25 m.

次に、図１〜図３に示すように、先行掘削工程を実施する。即ち、図１に示すように、第１チェーンコンベアカッタ１１により地面から第１深さＨ１に向けて掘削を行い、図２に示すように、下方折返部１１ａが第１深さＨ１に至るまで掘削を継続する。このとき、掘削により生じた残置土１４は、必要量だけ地上で回収するが、そのほとんどは、地中に残置し、後に骨材として活用する。その結果、残置土１４は、ほぐされた状態となり、長尺チェーンコンベアカッタ１３が移動する際の抵抗は非常に小さくなる。   Next, as shown in FIGS. 1 to 3, a preceding excavation process is performed. That is, as shown in FIG. 1, excavation is performed from the ground toward the first depth H1 by the first chain conveyor cutter 11, and as shown in FIG. 2, the lower folded portion 11a reaches the first depth H1. Continue drilling. At this time, the remaining soil 14 generated by excavation is collected on the ground in a necessary amount, but most of it is left in the ground and used later as aggregate. As a result, the remaining soil 14 is loosened, and the resistance when the long chain conveyor cutter 13 moves becomes very small.

次に、図３に示すように、進行方向Ｎ１に所定量だけずれた位置において、先行掘削工程を実施し、これを繰り返す。   Next, as shown in FIG. 3, a preceding excavation process is performed at a position shifted by a predetermined amount in the traveling direction N1, and this is repeated.

その結果、図４に示すように、残置土１４が残置された溝が進行方向Ｎ１に形成されていくことになる。ここで、先行掘削工程では、土質や地下水の状況に応じて、以下のようにすることが望ましい。   As a result, as shown in FIG. 4, a groove in which the remaining soil 14 is left is formed in the traveling direction N1. Here, in the preceding excavation process, it is desirable to do as follows according to soil quality and groundwater conditions.

（１）花崗岩、石灰岩など、硬質地盤では、水等を使用せず単に掘削するだけ（いわゆる空堀り）とし、残置土１４を骨材として活用する。   (1) In hard ground such as granite and limestone, only excavation is performed without using water or the like (so-called empty digging), and the remaining soil 14 is utilized as an aggregate.

（２）軟弱地盤や砂質地盤では、水にベントナイト（膨潤材）や少量のセメント（貧配合）を混合したものを、安定剤をして注入し、残置土１４と攪拌混合し、スラリー状安定土又は低強度地盤とし、溝の壁崩壊を防止する。   (2) In soft ground or sandy ground, water mixed with bentonite (swelling material) or a small amount of cement (poor compound) is injected as a stabilizer, and stirred and mixed with the remaining soil 14 to form a slurry. Use stable soil or low-strength ground to prevent the walls of the trench from collapsing.

（３）（１）と（３）の中間では、水又は圧縮空気を注入しながらの掘削するとよい。   (3) In the middle of (1) and (3), excavation may be performed while injecting water or compressed air.

いずれにしても、構築すべき連続壁の上端部が、地面１またはそれよりも低い場合、残置土１４を必要量（注入する固化液の体積及び土粒子密度の変化量を考慮して決定する。）だけ取り除き、連続壁の上端部の仕上レベルを維持するのが好ましい。   In any case, when the upper end portion of the continuous wall to be constructed is lower than the ground 1 or lower, the remaining soil 14 is determined in consideration of the necessary amount (the volume of the solidified liquid to be injected and the amount of change in the soil particle density). It is preferred to maintain the finish level of the upper end of the continuous wall.

本形態では、先行掘削工程に引き続き、かつ並行して、後続掘削工程と構築工程とを連続的に実施する。まず、図４に示すように、長尺チェーンコンベアカッタ１３の下方折返部１２ａを第１深さＨ１まで移動し、第２深さＨ２を掘削する。この際、長尺チェーンコンベアカッタ１３から固化液を地中に吐出し、残置土１４と混合攪拌し、図５に示すように、下方折返部１２ａを目標深さＨまで至らせる。   In this embodiment, the subsequent excavation process and the construction process are continuously performed following and in parallel with the preceding excavation process. First, as shown in FIG. 4, the lower folded portion 12a of the long chain conveyor cutter 13 is moved to the first depth H1, and the second depth H2 is excavated. At this time, the solidified liquid is discharged into the ground from the long chain conveyor cutter 13 and mixed and stirred with the remaining soil 14 to bring the lower folded portion 12a to the target depth H as shown in FIG.

本形態では、この後、下方折返部１２ａを第１深さＨ１よりやや上方まで引き上げ、長尺チェーンコンベアカッタ１３を進行方向Ｎ１に横引きする。このとき、残置土１４は、ほぐされており、その抵抗は小さくなっているから、従来技術よりもはるかにスムーズに長尺チェーンコンベアカッタ１３を進行方向Ｎ１に移動できる。なお、この横引き時にも、固化液を吐出する。このように、長尺チェーンコンベアカッタ１３を地面上まで引き上げるのではなく、その下部を地中に埋めたまま作業を継続しているため、地面上まで引き上げる場合に比べ、作業時間を大幅に短縮でき好適である。   In this embodiment, thereafter, the lower folded portion 12a is pulled up slightly above the first depth H1, and the long chain conveyor cutter 13 is laterally pulled in the traveling direction N1. At this time, since the remaining soil 14 is loosened and its resistance is small, the long chain conveyor cutter 13 can be moved in the traveling direction N1 much more smoothly than in the prior art. Note that the solidified liquid is also discharged during this horizontal pulling. In this way, since the work is continued while the long chain conveyor cutter 13 is not pulled up to the ground, but the lower part thereof is buried in the ground, the working time is greatly reduced as compared with the case where it is pulled up to the ground. This is preferable.

そして、図６に示すように、横引き後に次の位置において、垂直下方へ掘削を行い、あわせて固化液を吐出する。以上の間においても、長尺チェーンコンベアカッタ１３よりも進行方向Ｎ１の上流側では、第１チェーンコンベアカッタ１１による先行掘削工程が、並行して実施される。   Then, as shown in FIG. 6, excavation is performed vertically downward at the next position after horizontal pulling, and the solidified liquid is discharged together. Also during the above, the preceding excavation process by the first chain conveyor cutter 11 is performed in parallel on the upstream side in the traveling direction N1 from the long chain conveyor cutter 13.

その結果、図７に示すように、壁体１５の集合体である、地中連続壁が構築されることになる。なお、図中では、地中連続壁の上端レベルは、地面１のレベルと一致しているが、これは一例に過ぎず、上端レベルを地面１のレベルよりも低くすることもできるし、高くすることもできる。また、進行方向Ｎ１は、一直線であってもよいし、曲線でもよい。   As a result, as shown in FIG. 7, an underground continuous wall that is an aggregate of the wall bodies 15 is constructed. In the figure, the upper end level of the underground continuous wall coincides with the level of the ground 1, but this is only an example, and the upper end level can be lower than the level of the ground 1 or higher. You can also Further, the traveling direction N1 may be a straight line or a curved line.

本発明の一実施の形態における地中連続壁の構築方法の工程説明図Process explanatory drawing of the construction method of the underground continuous wall in one embodiment of this invention 本発明の一実施の形態における地中連続壁の構築方法の工程説明図Process explanatory drawing of the construction method of the underground continuous wall in one embodiment of this invention 本発明の一実施の形態における地中連続壁の構築方法の工程説明図Process explanatory drawing of the construction method of the underground continuous wall in one embodiment of this invention 本発明の一実施の形態における地中連続壁の構築方法の工程説明図Process explanatory drawing of the construction method of the underground continuous wall in one embodiment of this invention 本発明の一実施の形態における地中連続壁の構築方法の工程説明図Process explanatory drawing of the construction method of the underground continuous wall in one embodiment of this invention 本発明の一実施の形態における地中連続壁の構築方法の工程説明図Process explanatory drawing of the construction method of the underground continuous wall in one embodiment of this invention 本発明の一実施の形態における地中連続壁の構築方法の工程説明図Process explanatory drawing of the construction method of the underground continuous wall in one embodiment of this invention （ａ）本発明の一実施の形態における長尺チェーンコンベアカッタの組立工程説明図 （ｂ）本発明の一実施の形態における長尺チェーンコンベアカッタの組立工程説明図 （ｃ）本発明の一実施の形態における長尺チェーンコンベアカッタの組立工程説明図 （ｄ）本発明の一実施の形態における長尺チェーンコンベアカッタの組立工程説明図(A) Assembly process explanatory drawing of long chain conveyor cutter in one embodiment of the present invention (b) Assembly process explanatory diagram of long chain conveyor cutter in one embodiment of the present invention (c) One embodiment of the present invention (D) Assembly process explanatory diagram of the long chain conveyor cutter in one embodiment of the present invention 従来のＴＲＤ法の説明図Illustration of conventional TRD method

符号の説明Explanation of symbols

１ 地面
２ ＴＲＤ施工機
３ チェーンソー
４ 固い地層
１０ 杭打機
１１ 第１チェーンコンベアカッタ
１２ 第２チェーンコンベアカッタ
１１ａ、１２ａ 下方折返部
１１ｂ、１２ｂ 上方折返部
１３ 長尺チェーンコンベアカッタ
１４ 残置土
１５ 壁体
Ｈ 目標深さ
Ｈ１ 第１深さ
Ｈ２ 第２深さ DESCRIPTION OF SYMBOLS 1 Ground 2 TRD construction machine 3 Chain saw 4 Hard stratum 10 Pile driver 11 1st chain conveyor cutter 12 2nd chain conveyor cutter 11a, 12a Lower return part 11b, 12b Upper return part 13 Long chain conveyor cutter 14 Remaining soil 15 Wall Body H Target depth H1 First depth H2 Second depth

Claims (5)

チェーンコンベアカッタを用いて、地中において目標深さに至る地中連続壁を構築する方法であって、
地面から前記目標深さに至る途中に第１深さを設定する工程と、
地面から前記第１深さまでを第１チェーンコンベアカッタを用いて垂直方向に掘削してほぐすとともに、その結果生じた掘削土の少なくとも一部を地中に残置する先行掘削工程と、
前記先行掘削工程の後に、地面から前記目標深さに至りうる長尺チェーンコンベアカッタの下端部を残置された掘削土中において移動させて前記第１深さまで至り、さらに、前記第１深さから前記目標深さまでを垂直方向に掘削する後続掘削工程と、
掘削土中に固化液を吐出し地面から前記目標深さに至る地中連続壁を構築する構築工程とを含む地中連続壁構築方法。 A method of constructing an underground continuous wall that reaches a target depth in the ground using a chain conveyor cutter,
Setting a first depth on the way from the ground to the target depth;
A prior excavation step of unraveling and vertically digging from the ground to the first depth using a first chain conveyor cutter, and leaving at least a portion of the resulting excavated soil in the ground;
After the preceding excavation step, the lower end of the long chain conveyor cutter that can reach the target depth from the ground is moved in the left excavation soil to reach the first depth, and further from the first depth. A subsequent excavation step of excavating vertically to the target depth;
An underground continuous wall construction method including a construction step of constructing an underground continuous wall from the ground to the target depth by discharging solidified liquid into excavated soil. 前記後続掘削工程と前記構築工程とは、前記長尺チェーンコンベアカッタにより連続的に実施される請求項１記載の地中連続壁構築方法。 The underground continuous wall construction method according to claim 1, wherein the subsequent excavation step and the construction step are continuously performed by the long chain conveyor cutter. 前記先行掘削工程において、水又は圧縮空気を注入する請求項１から２記載の地中連続壁構築方法。 The underground continuous wall construction method according to claim 1 or 2, wherein water or compressed air is injected in the preceding excavation step. 前記先行掘削工程において、水にベントナイト又はセメントを混合したものを注入する請求項１から３記載の地中連続壁構築方法。 The underground continuous wall construction method according to claim 1, wherein in the preceding excavation step, water mixed with bentonite or cement is injected. 前記先行掘削工程と前記後続掘削工程とは、前記第１チェーンコンベアカッタの掘削位置と、前記長尺チェーンコンベアカッタの掘削位置とをずらして並行して実施される請求項１から４記載の地中連続壁構築方法。 5. The ground according to claim 1, wherein the preceding excavation step and the subsequent excavation step are performed in parallel by shifting the excavation position of the first chain conveyor cutter and the excavation position of the long chain conveyor cutter. Medium continuous wall construction method.
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