JP4552152B2 - Vertical shaft construction of underground waste disposal facility and construction method of underground underground waste disposal facility - Google Patents

Vertical shaft construction of underground waste disposal facility and construction method of underground underground waste disposal facility Download PDF

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JP4552152B2
JP4552152B2 JP2006195581A JP2006195581A JP4552152B2 JP 4552152 B2 JP4552152 B2 JP 4552152B2 JP 2006195581 A JP2006195581 A JP 2006195581A JP 2006195581 A JP2006195581 A JP 2006195581A JP 4552152 B2 JP4552152 B2 JP 4552152B2
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steel pipe
excavation
waste
shaft
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JP2008026019A (en
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博夫 熊坂
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Shimizu Corp
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本発明は、例えば放射性廃棄物などの廃棄物を埋設処分する廃棄物地下埋設処分施設の立坑及びこの立坑を構築する方法に関する。   The present invention relates to a shaft of a waste underground burying disposal facility for burying waste such as radioactive waste and a method for constructing the shaft.

例えば地下300mを超える地山深部に高レベルの放射性廃棄物を埋設処分することが検討されている。この際、放射性廃棄物は、例えばガラスと混ぜて固化され、このガラス固化体を炭素鋼などからなるオーバーパックで密閉して廃棄体を形成した状態で処分される。そして、この廃棄体を処分するための廃棄物地下埋設処分施設Aは、図9に示すように、地表から地山深部の硬質岩や堆積軟岩の比較的安定した地山Gまで略垂直に構築した立坑1と、この立坑1の下端側に繋がる略環状の主要坑道2と、この主要坑道2と繋がるように形成した処分坑道(坑道)や処分孔(以下、処分坑道3という)とから構成され、廃棄体が、立坑1及び主要坑道2を通じて処分坑道3内に搬送されて処分される(例えば、特許文献1参照)。   For example, it has been studied to bury high-level radioactive waste in deep underground areas over 300m underground. At this time, the radioactive waste is solidified by mixing with glass, for example, and is disposed in a state in which the solidified glass is sealed with an overpack made of carbon steel or the like to form a waste. Then, as shown in FIG. 9, the underground waste disposal facility A for disposing of this waste is constructed substantially vertically from the ground surface to a relatively stable natural ground G of hard rock and sedimentary soft rock deep in the natural ground. The main shaft 2 is connected to the lower end side of the shaft 1, and the disposal tunnel (tunnel) and the disposal hole (hereinafter referred to as the disposal tunnel 3) formed so as to be connected to the main tunnel 2. Then, the waste is transported into the disposal tunnel 3 through the shaft 1 and the main tunnel 2 and disposed of (see, for example, Patent Document 1).

また、廃棄体を処分した処分坑道3をそのままにしておくと、処分坑道3の周辺地山Gの緩みの拡大や地下水の卓越した水みちの形成のおそれがあり、処分施設A全体としてのバリア性能を低下させるおそれがあるため、これを防止する目的で地山Gと同等以上の低透水性の材料(埋め戻し材4)で処分坑道2を埋め戻すことが考えられている。そして、この種の埋め戻し材4には、膨潤性や放射性廃棄物の吸着性に優れるベントナイトを主成分とするベントナイト混合材が用いられ、地山Gから処分坑道3に浸入した地下水が接触するとともに膨潤し、地山Gを押圧することでさらなる地下水の浸入を防止したり、膨潤に伴い埋め戻し材4の透水係数が低下することで地下水の浸透を防止する。これにより、放射性廃棄物を確実に外部の自然環境から隔離して処分することが可能になる。   In addition, if the disposal mine 3 where the waste is disposed is left as it is, there is a risk of the loosening of the natural ground G around the disposal mine 3 and the formation of an excellent waterway in the groundwater. Since there is a possibility of reducing the performance, it is considered to backfill the disposal tunnel 2 with a low water permeability material (backfill material 4) equal to or higher than the natural ground G for the purpose of preventing this. And this kind of backfill material 4 is a bentonite mixed material mainly composed of bentonite which is excellent in swelling property and adsorptivity of radioactive waste, and the groundwater that has entered the disposal tunnel 3 from the natural ground G comes into contact. It swells together and prevents further infiltration of groundwater by pressing the natural ground G, or prevents the penetration of groundwater by reducing the permeability coefficient of the backfill material 4 with swelling. This makes it possible to reliably dispose of radioactive waste from the outside natural environment.

一方、この種の廃棄物地下埋設処分施設Aの立坑1は、例えば図9から図12に示すように、地表から地山深部に向けて掘削した掘削坑5の地表部側の掘削面5aを支持する坑口部6(図10)を備え、この坑口部6は、掘削面5aを例えば厚さ100mm程度の吹き付けコンクリート7で覆い、径方向外側に且つ周方向に所定間隔で例えば長さ4000mm程度のロックボルト8を打設し、さらにその内周側を例えば1400mm程度の覆工コンクリート9で覆って構築される。また、坑口部6よりも地山深部に位置する本坑部10(図11及び図12)は、地山Gが硬岩系岩盤の場合(図11)には、掘削面5aを覆うように例えば厚さ100mm程度の吹き付けコンクリート7を設け、軟岩系岩盤の場合(図12)には、例えば厚さ550mm程度の覆工コンクリート9を設けて構築される。
特開2003−215297号公報
On the other hand, the vertical shaft 1 of this kind of waste underground burying disposal facility A has an excavation surface 5a on the surface portion side of the excavation pit 5 excavated from the ground surface toward the deep ground as shown in FIGS. 9 to 12, for example. The wellhead portion 6 (FIG. 10) to be supported is provided. The wellhead portion 6 covers the excavation surface 5a with sprayed concrete 7 having a thickness of, for example, about 100 mm, and has a length of, for example, about 4000 mm at a predetermined interval in the radially outer side and the circumferential direction. The lock bolt 8 is placed, and the inner peripheral side thereof is covered with a lining concrete 9 of about 1400 mm, for example. Further, the main pit portion 10 (FIGS. 11 and 12) located deeper than the mine entrance 6 covers the excavation surface 5a when the natural ground G is a hard rock base (FIG. 11). For example, spray concrete 7 having a thickness of about 100 mm is provided, and in the case of a soft rock base (FIG. 12), for example, lining concrete 9 having a thickness of about 550 mm is provided.
JP 2003-215297 A

しかしながら、上記の立坑1のように、掘削坑5の掘削面5a(地山G)の崩落を防止する支保として吹付けコンクリート7や覆工コンクリート9を設けた場合には、この支保に地下水が接触するとセメントからCa(カルシウム)などの高アルカリ成分が地下水に溶出し、立坑1の周辺が高アルカリ環境になる可能性がある。そして、高アルカリ成分を含む地下水が埋め戻し材4に接触した場合には、埋め戻し材4が劣化するおそれが生じる。   However, when the spray concrete 7 or the lining concrete 9 is provided as a support for preventing the collapse of the excavation surface 5a (the natural ground G) of the excavation pit 5 as in the vertical shaft 1, the groundwater is supplied to the support. When contacted, high alkali components such as Ca (calcium) are eluted from the cement into the groundwater, and there is a possibility that the vicinity of the shaft 1 becomes a highly alkaline environment. And when the groundwater containing a high alkali component contacts the backfilling material 4, there exists a possibility that the backfilling material 4 may deteriorate.

すなわち、埋め戻し材4のベントナイト混合材には、その膨潤性に優れるという点でNa(ナトリウム)を担持したNa型ベントナイトが多用されるが、このNa型ベントナイトは、Caイオンと接触するとNaとCaのイオン交換がなされ、膨潤性に劣るCa型ベントナイトに変質してしまう。そして、このようにベントナイトが変質した場合には、埋め戻し材4の膨潤性が乏しくなり地下水の遮蔽能力ひいては放射性物質の遮蔽能力の低下を招くおそれが生じてしまう。   That is, Na-type bentonite carrying Na (sodium) is often used for the bentonite mixed material of the backfill material 4 in terms of its excellent swellability. However, when this Na-type bentonite comes into contact with Ca ions, Na and Ca is ion-exchanged, and changes to Ca-type bentonite which is inferior in swelling property. And when bentonite changes in quality in this way, the swelling property of the backfilling material 4 will become scarce, and there exists a possibility of causing the fall of the shielding ability of groundwater and by extension, the shielding ability of a radioactive substance.

本発明は、上記事情を鑑み、廃棄物を隔離する埋め戻し材の劣化を確実に防止して廃棄物を長期的に安定な状態で処分可能な廃棄物地下埋設処分施設の立坑及びこの立坑の構築方法を提供することを目的とする。   In view of the above circumstances, the present invention is a shaft of a waste underground burying disposal facility that can reliably prevent deterioration of a backfill material that isolates waste and can dispose of waste in a long-term stable state. The purpose is to provide a construction method.

上記の目的を達するために、この発明は以下の手段を提供している。   In order to achieve the above object, the present invention provides the following means.

本発明の廃棄物地下埋設処分施設の立坑は、地表から地山深部に向けて延設され、廃棄物を処分するための坑道が繋がる廃棄物地下埋設処分施設の立坑であって、前記地山を掘削して形成した掘削坑内に挿入設置されて前記坑道と繋がる空間を画成する鋼管と、前記掘削坑の掘削面と前記鋼管との間に充填された非セメント系充填材とを備えて構成されていることを特徴とする。   The vertical shaft of the underground waste disposal facility according to the present invention is a vertical shaft of the underground waste disposal facility that extends from the surface of the ground to the deep ground and connects with a tunnel for disposing of waste. A steel pipe that is inserted and installed in an excavation pit formed by excavating and forming a space connected to the mine shaft, and a non-cement filler filled between the excavation surface of the excavation mine and the steel pipe. It is configured.

また、本発明の廃棄物地下埋設処分施設の立坑においては、前記鋼管内から前記地山内に向けて延び、前記地山内の地下水を前記鋼管内に導水して周辺地山の地下水位を低下させるための排水孔が設けられていることが望ましい。   Moreover, in the vertical shaft of the waste underground burying disposal facility of the present invention, it extends from the steel pipe toward the ground, and guides the ground water in the ground to the steel pipe to lower the ground water level of the surrounding ground. It is desirable to provide a drainage hole.

さらに、本発明の廃棄物地下埋設処分施設の立坑においては、前記非セメント系充填材がベントナイト混合材であることがより望ましい。   Furthermore, in the shaft of the underground waste disposal facility of the present invention, it is more preferable that the non-cement filler is a bentonite mixed material.

本発明の廃棄物地下埋設処分施設の立坑構築方法は、地表から地山深部に向けて延設され、廃棄物を処分するための坑道が繋がる廃棄物地下埋設処分施設の立坑を構築する方法であって、前記地山の地表部側の掘削面を支持するとともに掘削方向を規定するための坑口部を形成する坑口部形成工程と、前記地山の崩落を防止するための安定液を供給しながら前記地表から地山深部に延びる掘削坑を形成する掘削工程と、底蓋を設けて有底筒状を呈するように形成した鋼管を、前記掘削坑内の前記安定液による浮力を相殺するように前記鋼管内に水を供給しながら前記掘削坑内に挿入して設置する鋼管設置工程と、前記掘削坑の掘削面と前記鋼管の間に、前記安定液と置換するように非セメント系充填材を充填する裏込め工程とを備えることを特徴とする。   The shaft construction method of the underground waste disposal facility of the present invention is a method of constructing a shaft of a waste underground disposal facility that extends from the surface of the earth to the deep part of the ground and connects with a tunnel for disposal of waste. A wellhead forming step for forming a wellhead for supporting the excavation surface on the ground surface side of the natural ground and defining the excavation direction, and supplying a stabilizing liquid for preventing the collapse of the natural ground. However, the excavation process for forming the excavation pit extending from the ground surface to the deep part of the natural ground and the steel pipe formed to have a bottomed cylindrical shape by providing a bottom lid so as to offset the buoyancy due to the stabilizing liquid in the excavation mine A steel pipe installation step of inserting and installing in the excavation mine while supplying water into the steel pipe, and a non-cement filler to replace the stabilizing liquid between the excavation surface of the excavation mine and the steel pipe. Providing a backfilling process for filling And butterflies.

また、本発明の廃棄物地下埋設処分施設の立坑構築方法においては、前記鋼管内に挿入して所定深度に配した削孔機によって前記鋼管内から前記地山内に向けて延びる排水孔を形成し、該排水孔を通じて前記地山内の地下水を前記鋼管内に導水することにより周辺地山の地下水位を低下させる地下水位低下工程を備えることが望ましい。   Further, in the shaft construction method of the underground waste disposal facility of the present invention, a drain hole extending from the steel pipe toward the ground is formed by a drilling machine inserted into the steel pipe and arranged at a predetermined depth. It is desirable to provide a groundwater level lowering step in which the groundwater level in the surrounding ground is lowered by introducing the groundwater in the ground into the steel pipe through the drain hole.

さらに、本発明の廃棄物地下埋設処分施設の立坑構築方法において、前記鋼管内の前記水に浮かべた台船に前記削孔機を上載し、前記水を前記鋼管内から排出することにより前記台船とともに前記削孔機を所定深度に配置することがより望ましい。   Further, in the method for constructing a shaft of a waste underground burying disposal facility according to the present invention, the drilling machine is mounted on a trolley floated on the water in the steel pipe, and the water is discharged from the steel pipe by discharging the water from the steel pipe. It is more desirable to arrange the drilling machine at a predetermined depth together with the ship.

本発明の廃棄物地下埋設処分施設の立坑及び廃棄物地下埋設処分施設の立坑構築方法によれば、立坑が鋼管と非セメント系充填材とを備えて構成されるため、すなわち、立坑がセメントを全く使用することなく構築されるため、立坑周辺が高アルカリ環境になることがない。このため、廃棄物を隔離するための埋め戻し材が劣化するおそれを解消でき、確実に廃棄物を長期間安定した状態で処分することが可能になる。また、立坑の掘削面を支持する支保として鋼管を用いることにより、地下水の立坑内への漏水などを確実に防止できる。   According to the shaft of the waste underground burying disposal facility and the shaft construction method of the waste underground burying disposal facility of the present invention, the shaft is configured to include a steel pipe and a non-cement filler, that is, the shaft is made of cement. Since it is constructed without using it at all, the surroundings of the shaft does not become a highly alkaline environment. For this reason, the possibility that the backfill material for isolating the waste deteriorates can be eliminated, and the waste can be reliably disposed in a stable state for a long time. Moreover, by using a steel pipe as a support for supporting the excavation surface of the shaft, leakage of groundwater into the shaft can be reliably prevented.

さらに、安定液を供給しながら掘削坑を形成することで、全断面立坑掘削工法を適用でき、すなわち掘削坑を、機械掘削で、且つ掘削面を大気圧に解放することなく形成できるため、掘削に伴う周辺地山の応力変化を小さくすることができる。これにより、廃棄物と地上を最短経路で繋ぐことになる立坑の掘削坑を形成する際に、周辺地山に透水性が大きくなる掘削影響領域(緩み領域)が発生することを抑制できる。よって、確実に廃棄物を隔離できるように立坑を構築することが可能になる。   Furthermore, by forming the excavation pit while supplying a stabilizing liquid, the full-section vertical shaft excavation method can be applied, that is, the excavation pit can be formed by mechanical excavation and without releasing the excavation surface to atmospheric pressure. It is possible to reduce the stress change of the surrounding natural ground due to. Thereby, when forming the excavation shaft of the vertical shaft which connects a waste and the ground with the shortest path | route, it can suppress that the excavation influence area | region (loosening area | region) where water permeability becomes large in a surrounding natural ground generate | occur | produces. Therefore, it becomes possible to construct a shaft so that waste can be reliably isolated.

また、上記のように機械掘削で地山を掘削し、鋼管を建て込んで立坑を構築できることによって、早期に立坑を構築することが可能になり工期短縮を図ることが可能になる。これにより、従来、立坑の構築のために複数の掘削機械を用い、これに掛かるコストが施工費の増大を招いていたが、上記のように早期に立坑を構築できることで、一台の掘削機械を用いて複数の立坑を施工することも可能になり、経済性を大幅に向上させることが可能になる。   Further, as described above, a natural shaft can be excavated by mechanical excavation, and a shaft can be constructed by installing a steel pipe, so that a shaft can be constructed at an early stage and the construction period can be shortened. As a result, conventionally, a plurality of excavating machines have been used to construct a shaft, and the cost of this has led to an increase in construction cost. It is also possible to construct a plurality of shafts using, which can greatly improve the economic efficiency.

また、本発明の廃棄物地下埋設処分施設の立坑及び立坑構築方法においては、地山内の地下水を鋼管内に導水して周辺の地下水位を低下させるための排水孔を具備することによって、鋼管に作用する地下水圧を低減することができ、従来のように覆工コンクリートなどを用いることなく確実に安定した立坑を構築することが可能になる。   Further, in the shaft and the shaft construction method of the waste underground burying disposal facility of the present invention, the steel pipe is provided with a drain hole for guiding the groundwater in the natural ground into the steel pipe and lowering the surrounding groundwater level. The acting groundwater pressure can be reduced, and a stable shaft can be reliably constructed without using lining concrete or the like as in the prior art.

さらに、本発明の廃棄物地下埋設処分施設の立坑及び立坑構築方法においては、非セメント系充填材が、例えばベントナイトと水を混合したベントナイトスラリーやエタノールとベントナイトを混合したエタノールベントナイトなどのベントナイト混合材であることによって、ベントナイトの膨潤に伴い鋼管と掘削面の隙間、及び緩み領域の地山の間隙を密充填することができ、確実に廃棄物を隔離して廃棄物地下埋設処分施設の安全性及び信頼性を向上させることができる。   Furthermore, in the shaft and the shaft construction method of the underground waste disposal facility of the present invention, the non-cement filler is, for example, bentonite slurry mixed with bentonite and water or bentonite mixed material such as ethanol bentonite mixed with ethanol and bentonite As the bentonite swells, the gap between the steel pipe and the excavation surface, and the gap between the loose areas can be tightly filled, and the waste is buried in a safe place to ensure the safety of the underground underground disposal facility. And reliability can be improved.

以下、図1から図8、及び図9を参照し、本発明の一実施形態に係る廃棄物地下埋設処分施設の立坑及び廃棄物地下埋設処分施設の立坑構築方法について説明する。本実施形態は、例えば図9に示した廃棄物埋設処分施設Aと同様に、地下300mを超える地山深部の地山Gに高レベルの放射性廃棄物を埋設処分するための廃棄物埋設処分施設Bの立坑及びこの立坑の構築方法に関するものである。   Hereinafter, with reference to FIG. 1 to FIG. 8 and FIG. 9, a shaft of a waste underground burying disposal facility and a shaft construction method of a waste underground burying disposal facility according to an embodiment of the present invention will be described. This embodiment is, for example, a waste burying / disposal facility for burying high-level radioactive waste in a deep ground G over 300m underground, similar to the waste burying / disposal facility A shown in FIG. It relates to the shaft of B and the construction method of this shaft.

本実施形態の廃棄物地下埋設処分施設Bは、図1及び図9に示すように、地表から地山深部に向けて延設され、その下端側に廃棄物を処分するための坑道3が繋がる立坑20を備えて構築されている。   As shown in FIGS. 1 and 9, the waste underground burying disposal facility B of the present embodiment is extended from the ground surface toward a deep ground, and a mine shaft 3 for disposal of waste is connected to the lower end side thereof. It is constructed with a vertical shaft 20.

また、本実施形態の立坑20は、図1に示すように、地表側の坑口付近に設けられた略円筒状の坑口部6と、地山Gを掘削して形成した掘削坑5内に挿入設置されて、坑道2に連通する空間21を画成する鋼管22と、掘削坑5の内面(掘削面5a)と鋼管22との間に充填した非セメント系充填材23とを備えて構成されている。また、本実施形態の立坑20には、鋼管22が画成する空間21と繋がり地山G内に向けて延設されて、地山G内の地下水GWを鋼管22内に導水し周辺の地下水位を低下させるための複数の排水孔24が設けられている。   Further, as shown in FIG. 1, the vertical shaft 20 of the present embodiment is inserted into a substantially cylindrical wellhead portion 6 provided in the vicinity of a wellhead on the ground surface side and an excavation shaft 5 formed by excavating a natural ground G. A steel pipe 22 that is installed and defines a space 21 communicating with the mine shaft 2 and a non-cement filler 23 filled between the inner surface (excavation surface 5a) of the excavation mine 5 and the steel pipe 22 are configured. ing. In addition, the vertical shaft 20 of the present embodiment is connected to the space 21 defined by the steel pipe 22 and extends toward the ground mountain G, and the ground water GW in the ground mountain G is introduced into the steel pipe 22 to surround the surrounding ground water. A plurality of drain holes 24 are provided for lowering the position.

坑口部6は、図1及び図3に示すように、地表から垂直に打設して断面略円形に接続された複数の鋼管矢板6aからなる矢板部6bと、矢板部6bの上端と繋がり径方向外側に延出した支持板部6cとから構成されている。そして、この坑口部6は、矢板部6aによって地表部側の掘削面5a(地山G)が支持されてこの部分の地山Gが崩落することを防止している。また、坑口部6は、矢板部6bが略円形状に繋げられ垂直方向に延びて形成されることによって、掘削坑5の延設方向(掘削方向)を規定している。   As shown in FIGS. 1 and 3, the wellhead portion 6 is connected to the upper end of the sheet pile portion 6b and the sheet pile portion 6b formed of a plurality of steel pipe sheet piles 6a that are vertically placed from the ground surface and connected in a substantially circular cross section. It is comprised from the support plate part 6c extended to the direction outer side. And this wellhead part 6 is supporting the excavation surface 5a (natural ground G) by the side of a ground surface part by the sheet pile part 6a, and prevents that natural ground G of this part collapses. Moreover, the wellhead part 6 has prescribed | regulated the extending direction (excavation direction) of the excavation mine 5 by the sheet pile part 6b being connected by substantially circle shape, and extending in the perpendicular direction.

鋼管22は、図1及び図2に示すように、坑口部6の内壁面と面一に繋がる掘削面5aの崩落を防止するように、断面円形の掘削坑5と互いの軸線O1を同軸上に配するようにして設けられている。また、この鋼管22は、開口する下端を閉塞する鉄蓋またはコンクリート蓋の底蓋22aが設けられて有底円筒状を呈するように形成されている。そして、鋼管22は、その上端を地表面付近に配し、下端を掘削坑5の底部付近に配して設けられており、このとき、鋼管22の外面と坑口部6の内壁面及び掘削面5aとの間に隙間を設けた状態で設けられている。さらに、この鋼管22の内面側には、図2に示すように、周方向に繋がる環状に形成され、且つ内面から軸線O1直交方向に(鋼管22の内面から内側に向けて)突出する複数の補剛部(スティフナー)22bが、上端から下端までの範囲に並設されている。これにより、鋼管22の内面は、波状を呈するように形成され、このような補剛部22bを備えることによって、本実施形態の鋼管22は、大きな外圧に対する耐力を有する。   As shown in FIGS. 1 and 2, the steel pipe 22 coaxially connects the excavation pit 5 having a circular cross section and the axis O1 of each other so that the excavation surface 5a connected to the inner wall surface of the wellhead portion 6 is flush with each other. It is provided so as to be arranged. Further, the steel pipe 22 is provided with a bottom lid 22a of an iron lid or a concrete lid that closes the lower end of the opening, and is formed to have a bottomed cylindrical shape. The steel pipe 22 is provided with its upper end disposed near the ground surface and its lower end disposed near the bottom of the excavation mine 5. At this time, the outer surface of the steel pipe 22, the inner wall surface of the wellhead 6 and the excavation surface are provided. 5a is provided with a gap between them. Further, as shown in FIG. 2, a plurality of annular pipes connected in the circumferential direction are formed on the inner surface side of the steel pipe 22 and protrude in the direction orthogonal to the axis O <b> 1 (inward from the inner surface of the steel pipe 22). Stiffening portions (stiffeners) 22b are juxtaposed in the range from the upper end to the lower end. Thereby, the inner surface of the steel pipe 22 is formed so as to have a wave shape, and the steel pipe 22 of the present embodiment has a resistance against a large external pressure by including such a stiffening portion 22b.

非セメント系充填材23は、ベントナイトと水を混合したベントナイトスラリーまたはエタノールとベントナイトを混合したエタノールベントナイトのベントナイト混合材である。そして、この非セメント系充填材23は、ベントナイトが膨潤することによって鋼管22と、坑口部6及び掘削面5aとの隙間に密実に充填されている。また、非セメント系充填材23は、掘削坑5の形成時に生じた立坑20周辺地山Gの緩み領域の間隙にも膨潤しつつ充填されており、この緩み領域の透水性を他の部分の地山Gと同等に回復させている。   The non-cement filler 23 is a bentonite slurry in which bentonite and water are mixed, or a bentonite mixed material of ethanol bentonite in which ethanol and bentonite are mixed. The non-cement filler 23 is densely filled in the gap between the steel pipe 22 and the wellhead 6 and the excavation surface 5a as the bentonite swells. Further, the non-cement filler 23 is filled in the gap between the slack areas of the natural ground G around the shaft 20 generated when the excavation pit 5 is formed. It is restored to the same level as natural mountain G.

排水孔24は、その延設方向の開口する一端が鋼管22の空間21内に配され、略水平方向の地山G内に延設されている。また、鋼管22の坑口部6の下端付近から底蓋22a付近までの軸線O1方向の範囲に所定の間隔(深度)をもって、且つ周方向に所定の間隔をあけて複数並設されている。そして、これらの排水孔24は、内部にそれぞれ図示せぬ有孔管が挿入されており、集水した地下水をこの有孔管を通じて鋼管22内に排出する。   One end of the drainage hole 24 that opens in the extending direction is arranged in the space 21 of the steel pipe 22 and extends in the ground mountain G in the substantially horizontal direction. Further, a plurality of the steel pipes 22 are arranged side by side with a predetermined interval (depth) in the range in the direction of the axis O1 from the vicinity of the lower end of the wellhead portion 6 of the steel pipe 22 to the vicinity of the bottom cover 22a and with a predetermined interval in the circumferential direction. These drain holes 24 are inserted with perforated pipes (not shown), and the collected groundwater is discharged into the steel pipe 22 through the perforated pipes.

ついで、図1及び図3から図8を参照して、上記の構成からなる立坑20を構築する方法について説明し、本実施形態の廃棄物地下埋設処分施設Bの立坑20及びこの立坑20の構築方法の作用及び効果について説明する。   Next, with reference to FIG. 1 and FIG. 3 to FIG. 8, a method for constructing the vertical shaft 20 having the above-described configuration will be described, and the vertical shaft 20 of the underground waste disposal facility B of this embodiment and the construction of this vertical shaft 20 The operation and effect of the method will be described.

本実施形態の立坑20を構築する際には、はじめに、図3に示すように、地表から鋼管矢板6aを打設して矢板部6bを形成するとともに支持板部6cを形成して、坑口部6を構築する(坑口部形成工程)。   When constructing the shaft 20 of the present embodiment, first, as shown in FIG. 3, a steel pipe sheet pile 6a is driven from the ground surface to form a sheet pile portion 6b, and a support plate portion 6c is formed to form a wellhead portion. 6 is constructed (a wellhead forming step).

ついで、図4に示すように、矢板部6bで囲んだ地表部側の地山Gを掘削するとともに、全断面立坑掘削機械25を坑口部6上に設置する。そして、地山Gを取り除いた状態の矢板部6bの内部を、液面が地表面付近に位置するように例えばベントナイト泥水などの安定液26で満たしておく。   Next, as shown in FIG. 4, the ground surface G surrounded by the sheet pile portion 6 b is excavated, and the full-section vertical shaft excavating machine 25 is installed on the well head portion 6. And the inside of the sheet pile part 6b in the state where the natural ground G is removed is filled with a stable liquid 26 such as bentonite mud so that the liquid level is located near the ground surface.

ついで、図5に示すように、全断面立坑掘削機械25で坑口部6から地山深部に向けて地山Gの掘削を開始する。このとき、矢板部6bにより掘削方向を規定した状態で地山深部の地山Gが掘削され、さらに、液面が地表面付近に常時位置するように掘削坑5内に安定液26を供給して、掘削坑5の掘削面5aの崩落を防止しながら掘削を行なう(掘削工程)。このように、全断面立坑掘削機械25を用いて掘削坑5を形成し、且つ安定液26を供給しながら掘削して掘削坑5を形成することによって、早期に掘削坑5が形成されてゆき、且つ掘削坑5の掘削面5aが大気圧に解放されることがないため、掘削に伴う周辺地山Gの応力変化を小さく抑えた状態で掘削坑5が形成されてゆく。すなわち、掘削に伴う緩み領域の発生を抑制した状態で掘削坑5が形成される。   Next, as shown in FIG. 5, excavation of the natural ground G is started from the downhole portion 6 to the deep natural ground by the full-section vertical shaft excavating machine 25. At this time, the natural ground G in the deep ground is excavated in a state in which the excavation direction is defined by the sheet pile portion 6b, and the stable liquid 26 is supplied into the excavation pit 5 so that the liquid level is always located near the ground surface. Then, excavation is performed while preventing the excavation surface 5a of the excavation mine 5 from collapsing (excavation process). Thus, the excavation pit 5 is formed at an early stage by forming the excavation pit 5 using the full-section vertical shaft excavation machine 25 and excavating while supplying the stabilizing liquid 26 to form the excavation pit 5. And since the excavation surface 5a of the excavation mine 5 is not released to atmospheric pressure, the excavation pit 5 is formed in a state in which the stress change of the surrounding natural ground G accompanying excavation is suppressed to a small level. That is, the excavation pit 5 is formed in a state in which the occurrence of the slack area associated with excavation is suppressed.

そして、所定深度の掘削坑5を形成して全断面立坑掘削機械25を撤去した段階で、図6に示すように、下端に底蓋22aを取り付けた鋼管22を例えばクレーン27で吊り下げ、安定液26で満たされた掘削坑5内に下端側から挿入してゆく。このとき、安定液26の浮力を相殺するために鋼管22内に順次水Wを注ぎ入れて重量を増大させ、この鋼管22内に溜まった水Wの重さを利用して、安定液26内に鋼管22を沈めてゆく。このようにして、鋼管22を掘削坑5内の所定の位置に設置する(鋼管設置工程)。なお、このとき、鋼管22の掘削坑5内への挿入に伴い地上に押し出される安定液26は、適宜手段を用いて回収される。   Then, at the stage where the excavation pit 5 of a predetermined depth is formed and the entire section vertical excavation machine 25 is removed, as shown in FIG. 6, the steel pipe 22 with the bottom lid 22a attached to the lower end is suspended by, for example, a crane 27 and stabilized. It is inserted into the excavation pit 5 filled with the liquid 26 from the lower end side. At this time, in order to offset the buoyancy of the stabilizing liquid 26, water W is poured into the steel pipe 22 sequentially to increase the weight, and the weight of the water W accumulated in the steel pipe 22 is used to increase the weight in the stabilizing liquid 26. The steel pipe 22 is submerged. Thus, the steel pipe 22 is installed in the predetermined position in the excavation mine 5 (steel pipe installation process). At this time, the stabilizing liquid 26 pushed out to the ground with the insertion of the steel pipe 22 into the excavation mine 5 is recovered using appropriate means.

ついで、鋼管22を掘削坑5内に挿入設置した段階で、図7に示すように、鋼管22と掘削坑5の掘削面5aとの隙間に、安定液26と置換するように非セメント系充填材(ベントナイト混合材)23を供給する(裏込め工程)。このとき、安定液26と置換したベントナイト混合材23は、鋼管22と掘削坑5の掘削面5aとの間に、ベントナイトの膨潤によって密実に充填される。また、このベントナイト混合材23は、掘削坑5の形成に伴い発生した地山Gの緩み領域の間隙にも侵入してゆく。特にエタノールベントナイトを用いた場合には、地山Gの緩み領域の間隙内に侵入した後に、地山G内の地下水GWが接触するとともにエタノールとこの地下水GWが置換し、置換した地下水GWによってベントナイトが膨潤して、高密度で緩み領域の間隙を埋める。これにより、緩み領域の透水性が他の地山Gと確実に同等以上に回復する。   Next, at the stage where the steel pipe 22 is inserted and installed in the excavation pit 5, as shown in FIG. 7, the gap between the steel pipe 22 and the excavation surface 5a of the excavation pit 5 is filled with non-cement system so as to replace the stabilizing liquid 26. A material (bentonite mixed material) 23 is supplied (backfilling step). At this time, the bentonite mixed material 23 replaced with the stabilizing liquid 26 is densely filled between the steel pipe 22 and the excavation surface 5a of the excavation mine 5 by the swelling of bentonite. Moreover, this bentonite mixed material 23 also penetrates into the gap in the loose region of the natural ground G generated with the formation of the excavation pit 5. In particular, when ethanol bentonite is used, the groundwater GW in the natural ground G comes into contact with the groundwater GW after entering the gap in the loose region of the natural ground G, and ethanol and this groundwater GW are replaced. Swells and fills the gaps in the loose area at high density. As a result, the water permeability of the loosened region is reliably restored to the same level or more as that of the other natural ground G.

ついで、鋼管22と掘削坑5の掘削面5aとの隙間を完全にベントナイト混合材23で充填した段階で、図8に示すように、鋼管22内に満たされた水Wに浮船(台船)28を浮かべ、この台船28上に削孔機29を上載する。そして、鋼管22内の水Wを地上に排出して水面を低下させるとともに、台船28ひいては削孔機29を鋼管22内の所定の深度まで移動させる。このようにして削孔機29が所定の深度に達した段階でその移動を停止し、すなわち鋼管22内の水Wの排出を停止し、削孔機29で、鋼管22の内側から略水平方向外側の地山G内に延びる排水孔24を形成する(排水孔形成工程)。そして、この排水孔24内に有孔管(排水パイプ)を建て込む。このように、鋼管22内の水Wを排出しながら順次下方に削孔機29を配して排水孔24の形成及び排水パイプの建て込みを行なうことで、複数の排水パイプが、深さ方向に所定の間隔をあけ且つ周方向に所定の間隔をあけて設置される。これにより、図1に示した本実施形態の立坑20が構築される。また、排水パイプ(排水孔24)によって、地山G内の地下水GWが鋼管22内に導水されて周辺地山G内の地下水位が低下することにより、鋼管22に作用する地下水圧が低減し、鋼管22が地下水圧などの外力で変形することが防止できる。なお、台船28及び削孔機29を鋼管22内から搬出して、鋼管22内の水Wを除去した段階で、鋼管22の底蓋22aを撤去してもよい。特に底蓋22aがコンクリート蓋である場合には、撤去することが望ましい。   Next, when the gap between the steel pipe 22 and the excavation surface 5a of the excavation pit 5 is completely filled with the bentonite mixed material 23, as shown in FIG. 28 is floated, and a drilling machine 29 is mounted on the carriage 28. Then, the water W in the steel pipe 22 is discharged to the ground to lower the water surface, and the trolley 28 and the hole drilling machine 29 are moved to a predetermined depth in the steel pipe 22. In this way, when the hole drilling machine 29 reaches a predetermined depth, its movement is stopped, that is, the discharge of the water W in the steel pipe 22 is stopped, and the hole drilling machine 29 is moved substantially horizontally from the inside of the steel pipe 22. A drain hole 24 extending in the outer ground mountain G is formed (drain hole forming step). A perforated pipe (drainage pipe) is built in the drainage hole 24. In this way, the drainage pipes 24 are formed and the drainage holes 24 are formed and the drainage pipes are erected while discharging the water W in the steel pipe 22 in order, so that the plurality of drainage pipes are arranged in the depth direction. Are installed at predetermined intervals in the circumferential direction. Thereby, the shaft 20 of this embodiment shown in FIG. 1 is constructed. Moreover, the groundwater GW in the natural ground G is guided into the steel pipe 22 by the drain pipe (drain hole 24), and the groundwater pressure in the surrounding natural ground G is lowered, so that the groundwater pressure acting on the steel pipe 22 is reduced. The steel pipe 22 can be prevented from being deformed by an external force such as underground water pressure. In addition, the bottom cover 22a of the steel pipe 22 may be removed at the stage where the carriage 28 and the hole drilling machine 29 are carried out of the steel pipe 22 and the water W in the steel pipe 22 is removed. It is desirable to remove especially when the bottom cover 22a is a concrete cover.

したがって、本実施形態の廃棄物地下埋設処分施設Bの立坑20及びこの立坑20の構築方法によれば、立坑20が鋼管22と非セメント系充填材23とを備えて構成されるため、すなわち、立坑20がセメントを全く使用することなく構築されるため、周辺地下水が高アルカリ環境になることがない。このため、廃棄物を隔離するための埋め戻し材が劣化することがなく、確実に廃棄物を長期間安定した状態で処分することが可能になる。また、掘削坑5の掘削面5aを支持する支保として鋼管22を用いることにより、周辺地山G内の地下水GWが立坑20内に漏水することがない。   Therefore, according to the shaft 20 of the waste underground burying disposal facility B and the construction method of the shaft 20 according to the present embodiment, the shaft 20 includes the steel pipe 22 and the non-cement filler 23, that is, Since the shaft 20 is constructed without using any cement, the surrounding groundwater does not become a highly alkaline environment. For this reason, the backfill material for isolating the waste does not deteriorate, and the waste can be reliably disposed in a stable state for a long time. Further, by using the steel pipe 22 as a support for supporting the excavation surface 5 a of the excavation mine 5, the groundwater GW in the surrounding natural ground G does not leak into the vertical shaft 20.

さらに、安定液26を供給しながら掘削坑5を形成することで、全断面立坑掘削工法を適用でき、すなわち掘削坑5を機械掘削で形成でき、掘削面5aを大気圧に解放することなく掘削坑5を形成できるため、掘削に伴う周辺地山Gの応力変化を小さくすることができる。これにより、周辺地山Gに掘削影響領域(緩み領域)が発生することを抑制でき、廃棄物と地上を最短経路で繋ぐことになる立坑20を好適に構築して、確実に廃棄物を隔離することが可能になる。   Furthermore, by forming the excavation pit 5 while supplying the stabilizing liquid 26, the entire section vertical excavation method can be applied, that is, the excavation pit 5 can be formed by mechanical excavation, and the excavation surface 5a is excavated without releasing it to atmospheric pressure. Since the pit 5 can be formed, the stress change of the surrounding natural ground G accompanying excavation can be made small. As a result, the occurrence of an excavation-affected area (slack area) in the surrounding natural ground G can be suppressed, and the shaft 20 that connects the waste and the ground with the shortest path is suitably constructed to reliably isolate the waste. It becomes possible to do.

また、上記のように機械掘削で地山Gを掘削し、鋼管22を建て込んで立坑20を構築できることにより、立坑20を早期に構築することができ工期短縮を図ることが可能になる。これにより、従来、立坑の構築のために、複数の掘削機械を用い、これに掛かるコストが施工費の増大を招いていたが、上記のように早期に立坑20を構築できることで、一台の掘削機械を用いて複数の立坑を施工することも可能になって、経済性を大幅に向上させることが可能になる。   Further, since the ground shaft G can be constructed by excavating the natural ground G by mechanical excavation and building the steel pipe 22 as described above, the shaft 20 can be constructed early and the construction period can be shortened. Thus, conventionally, a plurality of excavating machines have been used for the construction of the shaft, and the cost required for this has led to an increase in the construction cost. However, by constructing the shaft 20 early as described above, It becomes possible to construct a plurality of shafts using an excavating machine, and it is possible to greatly improve the economy.

また、排水孔24が具備されることによって、立坑20の鋼管22に作用する地下水圧を低減でき、従来のように覆工コンクリートなどを用いることなく確実に安定した立坑20を構築することが可能になる。   Further, by providing the drainage hole 24, the groundwater pressure acting on the steel pipe 22 of the shaft 20 can be reduced, and a stable shaft 20 can be reliably constructed without using lining concrete as in the prior art. become.

さらに、非セメント系充填材としてベントナイト混合材23を用いることによって、ベントナイトの膨潤に伴い鋼管22と掘削面5aの隙間、及び緩み領域の地山Gの間隙を確実に密充填でき、確実に廃棄物を隔離して廃棄物地下埋設処分施設Bの安全性及び信頼性を向上させることができる。   Furthermore, by using the bentonite mixed material 23 as a non-cement filler, the gap between the steel pipe 22 and the excavation surface 5a and the gap between the natural ground G in the loosened region can be reliably and closely filled with the swelling of the bentonite, and the disposal is ensured. It is possible to improve the safety and reliability of the underground waste disposal facility B by isolating the object.

以上、本発明に係る廃棄物地下埋設処分施設の立坑及びこの立坑の構築方法の一実施形態について説明したが、本発明は上記の一実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。例えば、本実施形態では、坑口部6が複数の鋼管矢板6aからなる矢板部6bと支持板部6cとを備えて形成されているものとしたが、坑口部6が地表部側に設けられる関係上、特にセメントからの高アルカリ成分の溶出による埋め戻し材の劣化が生じ得ないと判断される場合には、矢板部6を例えばコンクリート製の地中連続壁としてもよい。   As mentioned above, although one embodiment of the shaft of the underground waste disposal facility and the construction method of the shaft according to the present invention has been described, the present invention is not limited to the above-described embodiment, and does not depart from the gist thereof. The range can be changed as appropriate. For example, in the present embodiment, the wellhead portion 6 is formed to include the sheet pile portion 6b including the plurality of steel pipe sheet piles 6a and the support plate portion 6c. However, the wellhead portion 6 is provided on the ground surface side. In addition, when it is determined that deterioration of the backfill material due to elution of a high alkali component from cement in particular cannot occur, the sheet pile portion 6 may be an underground continuous wall made of concrete, for example.

また、本実施形態では、図6に、クレーン27で支持した一本ものの鋼管22を安定液26中に挿入するように図示したが、分割した鋼管を用い、挿入時に鋼管の頭部が地表面付近に達するとともに他の鋼管の下端とこの頭部を溶接などで接続して、最終的に一本ものの鋼管を掘削坑5内に設置するようにしてもよい。   Further, in the present embodiment, FIG. 6 illustrates that a single steel pipe 22 supported by the crane 27 is inserted into the stabilizing liquid 26, but a divided steel pipe is used, and the head of the steel pipe is the ground surface at the time of insertion. While reaching the vicinity, the lower end of another steel pipe and this head may be connected by welding or the like, so that one steel pipe may be finally installed in the excavation pit 5.

さらに、本実施形態では、立坑20が排水孔24を備えるものとして説明を行なったが、例えば立坑20周辺の地下水位を他の地下水位低下工法を利用して低下させる場合には、特に排水孔24を具備する必要はない。また、本実施形態では、非セメント系充填材23としてベントナイト混合材を用いるものとしたが、セメント成分を含まず、且つ鋼管22と掘削面5aの隙間を密実に充填することが可能であれば、他の材料であってもよい。   Further, in the present embodiment, the shaft 20 has been described as having the drainage hole 24. For example, when the groundwater level around the shaft 20 is lowered by using another groundwater level lowering method, the drainage hole is particularly preferred. 24 need not be provided. In this embodiment, the bentonite mixed material is used as the non-cement filler 23. However, if the cement component is not included and the gap between the steel pipe 22 and the excavation surface 5a can be filled densely, Other materials may be used.

本発明の一実施形態に係る廃棄物地下埋設処分施設の立坑を示す側断面図である。It is a sectional side view which shows the vertical shaft of the waste underground burying disposal facility which concerns on one Embodiment of this invention. 図1の立坑に具備する鋼管の斜視図である。It is a perspective view of the steel pipe which the shaft of FIG. 1 comprises. 本発明の一実施形態に係る廃棄物地下埋設処分施設の立坑の坑口部を構築した状態を示す側断面図である。It is a sectional side view which shows the state which constructed the wellhead part of the vertical shaft of the waste underground burying disposal facility which concerns on one Embodiment of this invention. 本発明の一実施形態に係る廃棄物地下埋設処分施設の立坑の坑口部上に全断面立坑掘削機械を設置した状態を示す側断面図である。It is a sectional side view which shows the state which installed the whole cross-section shaft excavation machine on the wellhead part of the shaft of the underground waste disposal facility which concerns on one Embodiment of this invention. 本発明の一実施形態に係る廃棄物地下埋設処分施設の立坑の掘削坑を形成している状態を示す側断面図である。It is side sectional drawing which shows the state which forms the excavation shaft of the vertical shaft of the waste underground burying disposal facility which concerns on one Embodiment of this invention. 本発明の一実施形態に係る廃棄物地下埋設処分施設の立坑の掘削坑内に鋼管を挿入している状態を示す側断面図である。It is side sectional drawing which shows the state which has inserted the steel pipe in the excavation mine of the vertical shaft of the waste underground burying disposal facility which concerns on one Embodiment of this invention. 本発明の一実施形態に係る廃棄物地下埋設処分施設の立坑の非セメント系充填材を充填している状態を示す側断面図である。It is a sectional side view which shows the state which has filled the non-cement-type filler of the vertical shaft of the waste underground burying disposal facility which concerns on one Embodiment of this invention. 本発明の一実施形態に係る廃棄物地下埋設処分施設の立坑の排水孔を形成している状態を示す側断面図である。It is a sectional side view which shows the state which has formed the drainage hole of the vertical shaft of the waste underground burying disposal facility which concerns on one Embodiment of this invention. 廃棄物地下埋設処分施設を示す斜視図である。It is a perspective view which shows a waste underground burying disposal facility. 従来の廃棄物地下埋設処分施設の立坑の坑口部の構成を示す断面図である。It is sectional drawing which shows the structure of the wellhead part of the vertical shaft of the conventional waste underground burying disposal facility. 従来の廃棄物地下埋設処分施設の硬岩系岩盤の立坑の本坑部の構成を示す断面図である。It is sectional drawing which shows the structure of the main pit part of the vertical shaft of the hard-rock-type rock mass of the conventional waste underground burying disposal facility. 従来の廃棄物地下埋設処分施設の軟岩系岩盤の立坑の本坑部の構成を示す断面図である。It is sectional drawing which shows the structure of the main pit part of the vertical shaft of the soft rock base rock of the conventional underground waste disposal facility.

符号の説明Explanation of symbols

1 立坑
2 主要坑道(坑道)
3 処分坑道(坑道)
5 掘削坑
5a 掘削面
6 坑口部
10 本坑部
20 立坑
21 坑道に繋がる空間
22 鋼管
22a 底蓋
22b 補剛部
23 非セメント系充填材(ベントナイト混合材)
24 排水孔
25 全断面立坑掘削機
26 安定液
28 台船(浮船)
29 削孔機
A 廃棄物地下埋設処分施設
B 廃棄物地下埋設処分施設
G 地山
GW 地下水
W 水
O1 軸線

1 shaft 2 main tunnel (tunnel)
3 disposal tunnels (tunnels)
5 Excavation pit 5a Excavation surface 6 Wellhead part 10 Main pit part 20 Vertical pit 21 Space 22 connected to the tunnel 22 Steel pipe 22a Bottom cover 22b Stiffening part 23 Non-cement filler (bentonite mixed material)
24 Drainage hole 25 Whole section vertical shaft excavator 26 Stabilizing liquid 28
29 Drilling Machine A Waste Underground Disposal Facility B Waste Underground Disposal Facility G Ground Mountain GW Groundwater W Water O1 Axis

Claims (6)

地表から地山深部に向けて延設され、廃棄物を処分するための坑道が繋がる廃棄物地下埋設処分施設の立坑であって、
前記地山を掘削して形成した掘削坑内に挿入設置されて前記坑道と繋がる空間を画成する鋼管と、前記掘削坑の掘削面と前記鋼管との間に充填された非セメント系充填材とを備えて構成されていることを特徴とする廃棄物地下埋設処分施設の立坑。
It is a shaft of a waste underground disposal facility that extends from the surface of the earth to the deep part of the ground and connects to a tunnel for disposing of waste.
A steel pipe which is inserted into an excavation pit formed by excavating the natural ground and defines a space connected to the mine shaft; a non-cement filler filled between the excavation surface of the excavation mine and the steel pipe; A vertical shaft of a waste underground burying disposal facility, characterized by comprising:
請求項1記載の廃棄物地下埋設処分施設の立坑において、
前記鋼管内から前記地山内に向けて延び、前記地山内の地下水を前記鋼管内に導水して周辺地山の地下水位を低下させるための排水孔が設けられていることを特徴とする廃棄物地下埋設処分施設の立坑。
In the shaft of the underground waste disposal facility according to claim 1,
Waste that extends from the inside of the steel pipe toward the inside of the natural ground, and is provided with drainage holes for lowering the groundwater level of the surrounding natural ground by guiding the groundwater in the natural ground into the steel pipe. Vertical shaft of underground disposal facility.
請求項1または請求項2に記載の廃棄物地下埋設処分施設の立坑において、
前記非セメント系充填材がベントナイト混合材であることを特徴とする廃棄物地下埋設処分施設の立坑。
In the shaft of the underground waste disposal facility according to claim 1 or claim 2,
A shaft of a waste underground burying disposal facility, wherein the non-cement filler is a bentonite mixed material.
地表から地山深部に向けて延設され、廃棄物を処分するための坑道が繋がる廃棄物地下埋設処分施設の立坑を構築する方法であって、
前記地山の地表部側の掘削面を支持するとともに掘削方向を規定するための坑口部を形成する坑口部形成工程と、前記地山の崩落を防止するための安定液を供給しながら前記地表から地山深部に延びる掘削坑を形成する掘削工程と、底蓋を設けて有底筒状を呈するように形成した鋼管を、前記掘削坑内の前記安定液による浮力を相殺するように前記鋼管内に水を供給しながら前記掘削坑内に挿入して設置する鋼管設置工程と、前記掘削坑の掘削面と前記鋼管の間に、前記安定液と置換するように非セメント系充填材を充填する裏込め工程とを備えることを特徴とする廃棄物地下埋設処分施設の立坑構築方法。
A method of constructing a vertical shaft of a waste underground burying disposal facility that extends from the surface of the earth to a deep part of a natural mountain and connects to a tunnel for disposal of waste,
Supporting the excavation surface on the ground surface side of the natural ground and forming a well opening for defining the excavation direction, and supplying the stabilizing liquid for preventing the collapse of the natural ground, the ground surface An excavation process for forming an excavation mine extending from the ground to a deep part of the ground, and a steel pipe formed so as to have a bottomed cylindrical shape by providing a bottom lid, in the steel pipe so as to cancel the buoyancy due to the stabilizing liquid in the excavation mine A steel pipe installation step that is inserted into the excavation mine while supplying water to the excavation mine, and a back surface that is filled with a non-cement filler so as to replace the stabilizing liquid between the excavation surface of the excavation mine and the steel pipe. A method for constructing a shaft of a waste underground burying disposal facility characterized by comprising a filling step.
請求項4記載の廃棄物地下埋設処分施設の立坑構築方法において、
前記鋼管内に挿入して所定深度に配した削孔機によって前記鋼管内から前記地山内に向けて延びる排水孔を形成し、該排水孔を通じて前記地山内の地下水を前記鋼管内に導水することにより周辺地山の地下水位を低下させる地下水位低下工程を備えることを特徴とする廃棄物地下埋設処分施設の立坑構築方法。
In the shaft construction method of the underground waste disposal facility according to claim 4,
A drain hole extending from the steel pipe toward the ground is formed by a drilling machine inserted into the steel pipe and arranged at a predetermined depth, and ground water in the ground is introduced into the steel pipe through the drain hole. A method for constructing a shaft for a waste underground burying disposal facility, comprising a groundwater level lowering step for lowering a groundwater level of a surrounding natural ground.
請求項5記載の廃棄物地下埋設処分施設の立坑構築方法において、
前記鋼管内の前記水に浮かべた台船に前記削孔機を上載し、前記水を前記鋼管内から排出することにより前記台船とともに前記削孔機を所定深度に配置することを特徴とする廃棄物地下埋設処分施設の立坑構築方法。

In the shaft construction method of the underground waste disposal facility according to claim 5,
The drilling machine is mounted on a trolley floated on the water in the steel pipe, and the drilling machine is arranged at a predetermined depth together with the pedestal by discharging the water from the steel pipe. A method for constructing shafts for underground waste disposal facilities.

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