JP2000193796A - Method for back-filling and manufacture of block used for the method - Google Patents

Method for back-filling and manufacture of block used for the method

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Publication number
JP2000193796A
JP2000193796A JP10369878A JP36987898A JP2000193796A JP 2000193796 A JP2000193796 A JP 2000193796A JP 10369878 A JP10369878 A JP 10369878A JP 36987898 A JP36987898 A JP 36987898A JP 2000193796 A JP2000193796 A JP 2000193796A
Authority
JP
Japan
Prior art keywords
bentonite
block
thin plate
mixed
pure
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
Application number
JP10369878A
Other languages
Japanese (ja)
Other versions
JP4060471B2 (en
Inventor
Masuhiro Tanaka
益弘 田中
Hiroyuki Yamamoto
博之 山本
Osamu Fujisawa
理 藤澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kajima Corp
Original Assignee
Kajima Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kajima Corp filed Critical Kajima Corp
Priority to JP36987898A priority Critical patent/JP4060471B2/en
Publication of JP2000193796A publication Critical patent/JP2000193796A/en
Application granted granted Critical
Publication of JP4060471B2 publication Critical patent/JP4060471B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To improve workability for execution and the performance of stopping water by eliminating the necessity of conventional work for spraying soil mixed with bentonite containing debris in a site, when blocks made by compressing the soil mixed with bentonite containing debris are assembled and piled up and, for example, the whole galley is confined as a shielding layer by filling the inside of the gallery with the soil mixed with bentonite containing debris. SOLUTION: In a method for back-filling a gallery by assembling and piling up blocks 2 made by compressing soil mixed with bentonite containing debris inside a gallery, a thin plate part 3 of pure bentonite that has relatively high bloating tendency is formed for each of the blocks 2 on the circumference of them, and then the interstices between the blocks 2 are sealed with the thin plate part 3 of the bentonite mentioned above by assembling and piling up the blocks 2 with the thin plate part 3 on a rolled section.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、例えば放射性廃棄
物処分坑道などの坑道の埋め戻し方法およびそれに使用
するブロックの製造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 of backfilling a tunnel such as a radioactive waste disposal tunnel and a method of manufacturing a block used therein.

【0002】[0002]

【従来の技術】例えば放射性廃棄物には、高レベルのも
のと低レベルのものとがあり、このうち、高レベルの放
射性廃棄物6については、図8、図9に示すようにガラ
ス質の素材の中に均質に溶け込ませ、これを鉄鋼製の容
器5に鋳込み、地下数百メートルの岩盤層10に立坑11の
下方側部に横坑12を設け、該横坑12に適宜間隔で穴13を
形成し、該穴13内に前記容器5の周囲を低い透水性、高
いイオン交換能などの性質を持つ粘土15で包まれた形で
高レベルの放射性廃棄物6を収容することが検討されて
いる。
2. Description of the Related Art For example, radioactive waste is classified into high-level radioactive waste and low-level radioactive waste. Among them, the high-level radioactive waste 6 is glassy as shown in FIGS. The steel is homogeneously melted into a material, and cast into a steel vessel 5. A rock shaft 10 is provided several hundred meters below the ground, a horizontal shaft 12 is provided below the shaft 11, and holes are formed in the horizontal shaft 12 at appropriate intervals. It is considered that a high-level radioactive waste 6 is contained in the hole 13 in a form surrounded by a clay 15 having properties such as low water permeability and high ion exchange capacity around the container 5 in the hole 13. Have been.

【0003】さらに、確実な隔離を図るべく、立坑11や
横坑12などは粘土質のもので埋め戻されることも検討さ
れている。そして、この粘土質のものとしては、浸食に
強く、安定性の高い物質として透水性の低いことが要求
されることから、ベントナイトおよびこのベントナイト
に砂等を含有させたベントナイト混合土を採用すること
が一般的である。
[0003] Further, in order to ensure isolation, it has been studied that the shaft 11 and the horizontal shaft 12 are backfilled with a clay material. Since the clay-based material is required to have high erosion resistance and low water permeability as a highly stable substance, it is necessary to use bentonite and a bentonite-mixed soil containing sand and the like in this bentonite. Is common.

【0004】図7はその一例を示し、横坑12の底面に礫
混入ベントナイト混合土を転圧して転圧部1を形成し、
その上には前記礫混入ベントナイト混合土を圧縮してな
るブロック22を積み上げているが、礫混入ベントナイト
混合土は膨潤性が小さいため、ブロック22を組み積みし
た時にブロック22間に隙間が生じ、坑道全体としては礫
混入ベントナイト混合土の特徴である止水性が損なわれ
ることになってしまう。
[0004] Fig. 7 shows an example of this, in which the gravel-mixed bentonite mixed soil is compacted on the bottom surface of the horizontal shaft 12 to form a compacted portion 1,
The block 22 formed by compressing the gravel-mixed bentonite mixed soil is stacked thereon, but since the gravel-mixed bentonite mixed soil has a small swelling property, a gap is generated between the blocks 22 when the block 22 is assembled, As a whole, the water shutoff characteristic of the bentonite-mixed soil with gravel is impaired as a whole tunnel.

【0005】そこで、横坑12内面とブロック22との間な
どの隙間や、ブロック22間の隙間の吹き付け部23には、
ニードガンなどの吹き付け機を用いて前記礫混入ベント
ナイト混合土を吹き付けたり、ベントナイトを別途敷設
して、横坑12内を礫混入ベントナイト混合土で充填して
横坑12全体を遮蔽層として封止を図る。
Therefore, a gap such as between the inner surface of the horizontal shaft 12 and the block 22 and a blowing portion 23 of the gap between the blocks 22 are provided.
Spraying the gravel-mixed bentonite mixed soil using a spray gun such as a need gun or laying bentonite separately, filling the inside of the horizontal shaft 12 with the gravel-mixed bentonite mixed soil, sealing the entire horizontal shaft 12 as a shielding layer Aim.

【0006】[0006]

【発明が解決しようとする課題】横坑12内面とブロック
22との間などの隙間や、ブロック22間の隙間に礫混入ベ
ントナイト混合土を吹き付けて隙間を埋める方法では、
ニードガンなどの吹き付け機を用いる現場での作業を別
途必要として施工性がよくなく、隙間を確実に充填する
ことも困難で品質的にも問題が生じ、確実に止水を期待
できなかった。
[Problems to be Solved by the Invention] Inner surface of cross shaft 12 and block
In the method of spraying gravel mixed bentonite mixed soil into the gap between 22 and the gap between blocks 22, etc., to fill the gap,
Work on the site using a spraying machine such as a need gun was required separately, and the workability was poor. It was also difficult to reliably fill the gaps, and there was a problem in terms of quality.

【0007】本発明の目的は前記従来例の不都合を解消
し、例えば坑道の下部を礫混入ベントナイト混合土で転
圧し、その上部に礫混入ベントナイト混合土を圧縮して
なるブロックを組み積みして、坑道内を礫混入ベントナ
イト混合土で充填して坑道全体を遮蔽層として封止を図
る場合に、従来のような現場での礫混入ベントナイト混
合土の吹き付け作業が不要となって施工性の向上を図る
ことができ、止水性も向上できる埋め戻し方法およびそ
れに使用するブロックの製造方法を提供することにあ
る。
[0007] An object of the present invention is to solve the above-mentioned disadvantages of the prior art. For example, a lower part of a tunnel is compacted with gravel-mixed bentonite mixed soil, and a block formed by compressing the gravel-mixed bentonite mixed soil is assembled on the upper part. When the tunnel is filled with gravel-mixed bentonite-mixed soil and the entire tunnel is sealed as a shielding layer, it is not necessary to spray the gravel-mixed bentonite-mixed soil on site as in the past, improving workability. It is an object of the present invention to provide a backfill method and a method of manufacturing a block to be used for the backfill method, which can improve water stoppage.

【0008】[0008]

【課題を解決するための手段】本発明は前記目的を達成
するため、第1に、埋め戻し方法として、礫混入ベント
ナイト混合土を圧縮してなるブロックを組み積みする埋
め戻し方法において、前記ブロックの周面にブロックの
単体毎に比較的膨潤性の大きい純粋なベントナイトの薄
板部を形成しておき、この薄板部を有するブロックを組
み積みしてブロック間の隙間を前記ベントナイトの薄板
部でシールすることを要旨とするものである。
In order to achieve the above object, the present invention firstly provides a backfilling method for assembling a block obtained by compressing a gravel-mixed bentonite mixed soil as a backfilling method. A thin bentonite thin plate portion having a relatively large swelling property is formed on each of the blocks on the peripheral surface of the block, and blocks having the thin plate portion are assembled and a gap between the blocks is sealed with the bentonite thin plate portion. The gist is to do.

【0009】第2に、ブロックの製造方法として、純ベ
ントナイトの薄板を加圧成形し、この純ベントナイトの
薄板をブロック成形のための型枠内の周面に配置し、型
枠内に礫混入ベントナイト混合土を投入し、全体を加圧
成形して純ベントナイトの薄板が一体的に周囲に設けら
れたブロックとすることを要旨とするものである。
Second, as a method of manufacturing a block, a thin plate of pure bentonite is pressure-formed, and the thin plate of pure bentonite is arranged on a peripheral surface in a mold for forming a block, and gravel is mixed into the mold. The gist is to introduce a bentonite mixed soil and press-mold the whole to form a block in which a thin plate of pure bentonite is integrally provided around.

【0010】第3に、ブロック成形のための型枠内に仕
切板を配設し、この仕切板の外側に純ベントナイトを、
内側に礫混入ベントナイト混合土をそれぞれ投入した
後、仕切板を除去して全体を加圧成形して純ベントナイ
トの薄板が一体的に周囲に設けられたブロックとするこ
とを要旨とするものである。
Third, a partition plate is provided in a mold for forming a block, and pure bentonite is provided outside the partition plate.
After introducing the bentonite-mixed soil mixed with gravel into the inside, the gist is to remove the partition plate and press-mold the whole to form a block in which a thin plate of pure bentonite is integrally provided around. .

【0011】第4に、ブロック成形のための型枠内に礫
混入ベントナイト混合土を投入し、加圧成形してブロッ
クを成形し、このブロックの周面に純ベントナイトを吹
き付けて純ベントナイトの薄板が一体的に周囲に設けら
れたブロックとすることを要旨とするものである。
Fourth, a bentonite-mixed soil mixed with gravel is put into a mold for forming a block, and the block is formed by pressure molding, and pure bentonite is sprayed on the peripheral surface of the block to form a thin plate of pure bentonite. Is a block that is integrally provided on the periphery.

【0012】第5に、ブロック成形のための型枠内に礫
混入ベントナイト混合土を投入し、加圧成形してブロッ
クを成形し、他方、純ベントナイトの薄板を別体として
加圧成形し、この純ベントナイトの薄板を前記ブロック
の周面に、ベントナイトの水溶液等を接着剤として取り
付けて、純ベントナイトの薄板が一体的に周囲に設けら
れたブロックとすることを要旨とするものである。
Fifth, a bentonite-mixed soil mixed with gravel is put into a mold for forming a block, and pressed to form a block. On the other hand, a thin plate of pure bentonite is separately formed and pressed. The gist is that the pure bentonite thin plate is attached to the peripheral surface of the block as an adhesive with an aqueous solution of bentonite as an adhesive to form a block in which the pure bentonite thin plate is integrally provided around.

【0013】請求項1記載の本発明によれば、例えば、
坑道を埋め戻す礫混入ベントナイト混合土を圧縮してな
るブロックの周面には予め比較的膨潤性の大きい純粋な
ベントナイトの薄板部が形成してあるから、ブロックを
組み積みすれば、ブロック間の隙間は前記ベントナイト
の薄板部でシールされる。そして、この薄板部は比較的
膨潤性の大きい純粋なベントナイトで形成してあるか
ら、止水性能を発揮し、ブロックの組み積みの工程だけ
で坑道の十分な止水性能を得ることができる。
According to the first aspect of the present invention, for example,
A thin bent portion of pure bentonite with relatively large swelling is formed in advance on the peripheral surface of the block formed by compressing the gravel-mixed bentonite mixed soil that fills the tunnel, so if the blocks are assembled, The gap is sealed by the bent portion of the bentonite. And since this thin plate part is formed of pure bentonite having a relatively large swelling property, the water stopping performance is exhibited, and sufficient water stopping performance of the tunnel can be obtained only by the process of assembling the blocks.

【0014】請求項2記載の本発明によれば、純ベント
ナイトの薄板を周囲に備えるブロックは、予め別工程で
加圧成形した純ベントナイトの薄板をブロック成形のた
めの型枠内の周面に配置するだけで、型枠内に礫混入ベ
ントナイト混合土を投入し、全体を加圧成形するだけで
容易に製造できる。そして、加圧成形によるから一体性
のよいものが得られる。
According to the second aspect of the present invention, the block having a thin sheet of pure bentonite around it is provided with a thin sheet of pure bentonite formed in advance in a separate step by pressing on a peripheral surface in a mold for block forming. Just by arranging, it is possible to easily manufacture by simply putting the gravel-mixed bentonite mixed soil into the mold and pressing the whole. Then, a product having good integration can be obtained by the pressure molding.

【0015】請求項3記載の本発明によれば、純ベント
ナイトの薄板を周囲に備えるブロックは、ブロック成形
のための型枠内に仕切板を介して外側に純ベントナイト
を、内側に礫混入ベントナイト混合土をそれぞれ投入し
た後、仕切板を除去して全体を加圧成形するだけの1つ
の工程で容易に製造できる。
According to the third aspect of the present invention, a block provided with a thin plate of pure bentonite around the outside is provided with pure bentonite on the outside through a partition plate in a mold for forming a block, and bentonite mixed with gravel on the inside. After each of the mixed soils, the partition plate is removed, and the whole can be easily formed by a single step of pressure molding.

【0016】請求項4記載の本発明によれば、組み積み
する前の段階で、ブロックの周面に純ベントナイトを吹
き付けて純ベントナイトの薄板が一体的に周囲に設けら
れたブロックとすることで、吹き付け作業はブロックを
組み積みした後の現場で行わずにすみ、ブロックの周面
の各部に均等に純ベントナイトの薄板を形成でき、品質
が向上する。
According to the present invention, pure bentonite is sprayed on the peripheral surface of the block at a stage before assembling to form a block in which a thin plate of pure bentonite is integrally provided around the block. The spraying operation does not need to be performed at the site after the blocks are assembled, and a thin sheet of pure bentonite can be uniformly formed on each part of the peripheral surface of the block, thereby improving the quality.

【0017】請求項5記載の本発明によれば、予め別工
程で加圧成形した純ベントナイトの薄板を前記ブロック
の周面に、ベントナイトの水溶液を接着剤として取り付
けるだけですむから、取付のための格別の型枠や仕切り
板などを必要とせず、簡単に製造できる。
According to the fifth aspect of the present invention, it is only necessary to attach an aqueous solution of bentonite as an adhesive to the peripheral surface of the block with a thin plate of pure bentonite which has been previously press-formed in a separate step. It can be easily manufactured without the need for a special formwork or partition plate.

【0018】[0018]

【発明の実施の形態】以下、図面について本発明の実施
の形態を詳細に説明する。図1は本発明の埋め戻し方法
の実施形態を示す縦断側面図、図2は本発明の埋め戻し
方法で使用するブロックの斜視図で、埋め戻し方法の基
本構成は図7〜図8に示した従来例と同様であり、例え
ば放射性廃棄物処分坑道などを埋め戻す場合、ガラス質
の素材の中に均質に溶け込ませ、これを鉄鋼製の容器5
に鋳込み、地下数百メートルの岩盤層10に立坑11の下方
側部に横坑12を設け、該横坑12に適宜間隔で穴13を形成
し、該穴13内に前記容器5の周囲を低い透水性、高いイ
オン交換能などの性質を持つ粘土15で包まれた形で高レ
ベルの放射性廃棄物6を収容する。
Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical side view showing an embodiment of the backfill method of the present invention, FIG. 2 is a perspective view of a block used in the backfill method of the present invention, and the basic configuration of the backfill method is shown in FIGS. For example, when backfilling a radioactive waste disposal tunnel or the like, it is homogeneously dissolved in a vitreous material, and this is mixed with a steel container 5.
In the rock layer 10 several hundred meters underground, a horizontal shaft 12 is provided at the lower side of the shaft 11, holes 13 are formed in the horizontal shaft 12 at appropriate intervals, and the periphery of the vessel 5 is formed in the hole 13. It contains a high level of radioactive waste 6 in a form wrapped in clay 15 having properties such as low water permeability and high ion exchange capacity.

【0019】前記横坑12の底面に前記穴13の上部を被覆
するようにして礫混入ベントナイト混合土を振動ローラ
等の締固め機で転圧し、この転圧部1を積層させる。こ
こで、礫混入ベントナイト混合土は、例えば、配合比率
が礫(Gmax =5〜20mm):砂:ベントナイト=5
0:20〜40:30〜10(乾燥重量比率%)とする。なお、
比率はこの範囲において期待する遮水効果及び現地にお
ける材料の入手性及びコスト等を総合判断して決定し、
ベントナイトの配合比率を多くすれば遮水効果はより向
上するがコスト高になることは周知のところである。
The bentonite-mixed soil mixed with gravel is rolled by a compacting machine such as a vibrating roller so that the bottom of the horizontal shaft 12 covers the upper part of the hole 13, and the rolling portion 1 is laminated. The bentonite-mixed soil mixed with gravel has, for example, a compounding ratio of gravel (G max = 5 to 20 mm): sand: bentonite = 5
0:20 to 40:30 to 10 (dry weight ratio%). In addition,
The ratio is determined by comprehensively considering the water blocking effect expected in this range and the availability and cost of local materials,
It is well known that increasing the proportion of bentonite improves the water blocking effect but increases the cost.

【0020】次に、図2に示すような礫混入ベントナイ
ト混合土を圧縮して含水比7〜20%、圧縮応力25〜50K
g/cm2 における乾燥密度ρd=1.76〜2.0t
/m3 となるように形成したブロック2の周面に比較的
膨潤性の大きい純粋なベントナイトの薄板部3を形成し
たもの組み合わせて積層させる。
Next, the bentonite mixed soil mixed with gravel as shown in FIG. 2 is compressed to a water content of 7 to 20% and a compressive stress of 25 to 50K.
Dry density ρd in g / cm 2 = 1.76 to 2.0 t
/ M 3, and a laminate formed by forming a thin bent portion 3 of pure bentonite on the peripheral surface of the block 2 formed to have a relatively high swelling.

【0021】こうしてベントナイトの薄板部3を積層し
たブロック2は、隣接するもの同士の間には比較的膨潤
性の大きい純粋なベントナイトの薄板部3が介在するか
ら、ブロック2を組み積みするだけでこの周囲のベント
ナイトの薄板部3の大きな膨潤作用によってブロック2
間の隙間が自己シールされ、止水性が確実なものとな
る。よって、横坑12の全体が遮蔽層となり大きな遮蔽効
果が得られる。
In the block 2 on which the bentonite thin plate portions 3 are laminated in this way, the pure bentonite thin plate portions 3 having relatively large swellability are interposed between adjacent ones. The large swelling action of the bentonite sheet 3 around the block 2
The gap between them is self-sealed, and the water stoppage is assured. Therefore, the entire shaft 12 becomes a shielding layer, and a large shielding effect can be obtained.

【0022】ブロック2の周囲にベントナイトの薄板部
3を形成する方法としては、第1の方法として、図3に
示すように細かい粒状のままの純ベントナイトを別工程
で予め加圧成形して、純ベントナイトの薄板4を製作し
ておき、この薄板4をブロック2を成形する型枠7の内
周面に配置し、型枠7内に礫混入ベントナイト混合土8
を投入し、全体を加圧装置9で加圧成形して脱型すれば
純ベントナイトの薄板部3が周囲に一体的に設けられた
ブロック2が得られる。
As a method of forming the bentonite thin plate portion 3 around the block 2, as a first method, as shown in FIG. A thin plate 4 of pure bentonite is manufactured, and the thin plate 4 is arranged on the inner peripheral surface of a mold 7 for forming the block 2.
, And the whole is press-molded by a pressurizing device 9 and demolded to obtain a block 2 in which a thin plate portion 3 of pure bentonite is integrally provided around.

【0023】第2の方法は、図4に示すようにブロック
2を加圧成形する型枠7の内側に、純ベントナイトの薄
板4の厚さ分の隙間を存して、仕切り板14を配設し、こ
の仕切り板14と型枠7との隙間に細かい粒状のままの純
ベントナイト16を投入し、また、仕切り板14より内側の
型枠7の内部に礫混入ベントナイト混合土8を投入し、
この状態から仕切り板14を除去する。そして、全体を加
圧装置9で加圧成形すれば、純ベントナイト16と礫混入
ベントナイト混合土8とが同時に加圧成形され、これを
脱型すれば純ベントナイトの薄板部3が周囲に一体的に
設けられたブロック2が得られる。
In the second method, as shown in FIG. 4, a partition plate 14 is arranged inside a mold 7 for press-molding the block 2 with a gap corresponding to the thickness of the thin plate 4 of pure bentonite. The fine bent pure bentonite 16 is charged into the gap between the partition plate 14 and the formwork 7, and the gravel-mixed bentonite mixed soil 8 is charged into the formwork 7 inside the partition plate 14 inside. ,
From this state, the partition plate 14 is removed. Then, if the whole is press-formed by the pressurizing device 9, the pure bentonite 16 and the bentonite-mixed soil 8 mixed with gravel are pressed at the same time. Is obtained.

【0024】第3の方法は、型枠7に礫混入ベントナイ
ト混合土8を投入し、これを加圧成形して礫混入ベント
ナイト混合土のみによるブロック2を圧縮形成してお
き、図5に示すようにこの単体としてのブロック2の周
面に細かい粒状のままの純ベントナイト16を吹き付けれ
ば、純ベントナイトの薄板部3が周囲に一体的に設けら
れたブロック2が得られる。
In a third method, a bentonite-mixed bentonite-mixed soil 8 is charged into a mold 7 and pressed to form a block 2 made of only gravel-mixed bentonite-mixed soil, as shown in FIG. By spraying fine bentonite 16 as fine particles on the peripheral surface of the block 2 as a single unit, the block 2 in which the thin plate portion 3 of pure bentonite is provided integrally around the block 2 is obtained.

【0025】第4の方法は、型枠7に礫混入ベントナイ
ト混合土8を投入し、これを加圧成形して礫混入ベント
ナイト混合土のみによるブロック2を圧縮形成してお
く。一方、細かい粒状のままの純ベントナイト16を別工
程で加圧成形して、純ベントナイトの薄板4を製作して
おき、図6に示すようにこの純ベントナイトの薄板4を
別途圧縮成形しておいたブロック2の周に取り付ける。
取付方法は、例えば細かい粒状のままの純ベントナイト
を水で溶いた水溶液等を接着剤として、純ベントナイト
の薄板4をブロック2に一体的に取り付け、純ベントナ
イトの薄板部3が周囲に一体的に設けられたブロック2
を得る。
In a fourth method, a bentonite mixed soil 8 containing gravel is charged into a mold frame 7, and this is pressed to form a block 2 made of only the bentonite mixed soil mixed with gravel. On the other hand, pure bentonite 16 in the form of fine granules is pressure-formed in a separate step to produce a sheet 4 of pure bentonite, and this sheet 4 of pure bentonite is separately compression-molded as shown in FIG. Attached around the block 2
The mounting method is, for example, using a solution of pure granular bentonite dissolved in water or the like as an adhesive, a thin plate 4 of pure bentonite is integrally attached to the block 2, and a thin plate portion 3 of pure bentonite is integrally formed around the block 2. Block 2 provided
Get.

【0026】なお、本発明の埋め戻し方法は前記のよう
な放射性廃棄物処分坑道に限定して実施されるものでは
ない。
The backfill method of the present invention is not limited to the above-mentioned radioactive waste disposal tunnel.

【0027】[0027]

【発明の効果】以上述べたように本発明の埋め戻し方法
は、礫混入ベントナイト混合土を圧縮してなるブロック
を組み積みして、例えば坑道内を礫混入ベントナイト混
合土で充填して坑道全体を遮蔽層として封止を図る場合
に、ブロック間の隙間などを礫混入ベントナイト混合土
で埋めるに際し、ブロック単体毎にその周面に純ベント
ナイトの薄板部を一体に設けたから、かかるブロックを
組み積みするだけで、ブロック間の隙間はベントナイト
の薄板部で確実にシールされる。
As described above, according to the backfill method of the present invention, a block formed by compressing gravel-mixed bentonite mixed soil is assembled and, for example, the inside of a tunnel is filled with gravel-mixed bentonite mixed soil and the entire tunnel is filled. When sealing as a shielding layer, when filling gaps between blocks with gravel-mixed bentonite mixed soil, a thin plate of pure bentonite was integrally provided on the periphery of each block, so such blocks were assembled By simply doing so, the gap between the blocks is securely sealed with the bentonite thin plate portion.

【0028】そして、この薄板部は比較的膨潤性の大き
い純粋なベントナイトで形成してあるから、止水性能を
発揮し、ブロックの組み積みの工程だけで坑道の十分な
止水性能を得ることができ、従来のような現場での礫混
入ベントナイト混合土の吹き付け作業が不要となって、
施工性の向上を図ることができ、止水性も向上できる。
Since the thin plate portion is formed of pure bentonite having a relatively large swelling property, the thin plate portion exhibits a water stopping performance, and a sufficient water stopping performance of the tunnel is obtained only by the process of assembling the blocks. This eliminates the need for conventional on-site spraying of gravel-mixed bentonite-mixed soil,
The workability can be improved, and the waterproofness can be improved.

【0029】また、ブロックの周面に純ベントナイトの
薄板部を設ける方法も、ブロックの圧縮成形時に同時に
取付けたり、純ベントナイトの薄板を別体として加圧成
形した場合でも容易にブロックの周面に配設できるか
ら、製造が容易で坑道の埋め戻し方法全体の施工性の低
下を招くおそれがないものである。
Further, a method of providing a thin plate of pure bentonite on the peripheral surface of the block can be easily applied to the peripheral surface of the block even when the block is attached at the same time as the compression molding of the block or when the pure bentonite thin plate is formed separately by pressure. Since it can be disposed, it is easy to manufacture and there is no possibility that the workability of the entire backfill method of the tunnel will be reduced.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の埋め戻し方法の実施形態を示す縦断側
面図である。
FIG. 1 is a longitudinal sectional side view showing an embodiment of a backfill method of the present invention.

【図2】本発明の埋め戻し方法で使用するブロックの斜
視図である。
FIG. 2 is a perspective view of a block used in the backfill method of the present invention.

【図3】本発明の埋め戻し方法で使用するブロックの製
造方法の第1例を示す縦断正面図である。
FIG. 3 is a longitudinal sectional front view showing a first example of a method of manufacturing a block used in the backfill method of the present invention.

【図4】本発明の埋め戻し方法で使用するブロックの製
造方法の第2例を示す縦断正面図である。
FIG. 4 is a vertical sectional front view showing a second example of a method of manufacturing a block used in the backfill method of the present invention.

【図5】本発明の埋め戻し方法で使用するブロックの製
造方法の第3例を示す斜視図である。
FIG. 5 is a perspective view showing a third example of a method for manufacturing a block used in the backfill method of the present invention.

【図6】本発明の埋め戻し方法で使用するブロックの製
造方法の第4例を示す斜視図である。
FIG. 6 is a perspective view showing a fourth example of a method of manufacturing a block used in the backfill method of the present invention.

【図7】従来の埋め戻し方法を示す縦断側面図である。FIG. 7 is a vertical sectional side view showing a conventional backfill method.

【図8】従来の埋め戻し方法の他の例を示す縦断側面図
である。
FIG. 8 is a vertical sectional side view showing another example of the conventional backfill method.

【図9】従来の埋め戻し方法の他の例の要部を示す縦断
側面図である。
FIG. 9 is a vertical sectional side view showing a main part of another example of the conventional backfill method.

【符号の説明】[Explanation of symbols]

1…転圧部 2…ブロック 3…薄板部 4…薄板 5…容器 6…放射性廃棄物 7…型枠 8…礫混入ベントナ
イト混合土 9…加圧装置 10…岩盤層 11…立坑 12…横坑 13…穴 14…仕切り板 15…粘土 16…純ベントナイト 22…ブロック 23…吹き付け部
DESCRIPTION OF SYMBOLS 1 ... Compacting part 2 ... Block 3 ... Thin plate part 4 ... Thin plate 5 ... Container 6 ... Radioactive waste 7 ... Formwork 8 ... Gravel mixed bentonite mixed soil 9 ... Pressurization device 10 ... Rock formation 11 ... Vertical shaft 12 ... Horizontal shaft 13 ... hole 14 ... partition plate 15 ... clay 16 ... pure bentonite 22 ... block 23 ... sprayed part

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 礫混入ベントナイト混合土を圧縮してな
る多数のブロックを組み積みする埋め戻し方法におい
て、前記ブロックの周面にブロックの単体毎に比較的膨
潤性の大きい純粋なベントナイトの薄板部を形成してお
き、この薄板部を有するブロックを組み積みしてブロッ
ク間の隙間を前記ベントナイトの薄板部でシールするこ
とを特徴とする埋め戻し方法。
1. A backfill method for assembling and stacking a large number of blocks formed by compressing gravel-mixed bentonite mixed soil, wherein a thin bent portion of pure bentonite having a relatively large swelling property is provided for each block on the peripheral surface of the block. Wherein a block having the thin plate portion is assembled, and a gap between the blocks is sealed with the bentonite thin plate portion.
【請求項2】 純ベントナイトの薄板を加圧成形し、こ
の純ベントナイトの薄板をブロック成形のための型枠内
の周面に配置し、型枠内に礫混入ベントナイト混合土を
投入し、全体を加圧成形して純ベントナイトの薄板が一
体的に周囲に設けられたブロックとすることを特徴とす
るブロックの製造方法。
2. A thin plate of pure bentonite is formed under pressure, and the thin plate of pure bentonite is arranged on a peripheral surface in a mold for block forming, and a bentonite-mixed soil mixed with gravel is poured into the mold. Characterized in that a thin plate of pure bentonite is integrally formed on the periphery by pressure molding.
【請求項3】 ブロック成形のための型枠内に仕切板を
配設し、この仕切板の外側に純ベントナイトを、内側に
礫混入ベントナイト混合土をそれぞれ投入した後、仕切
板を除去して全体を加圧成形して純ベントナイトの薄板
が一体的に周囲に設けられたブロックとすることを特徴
とするブロックの製造方法。
3. A partition plate is provided in a mold for block molding, pure bentonite is charged outside the partition plate, and bentonite-mixed soil mixed with gravel is charged inside the partition plate. Then, the partition plate is removed. A method for producing a block, wherein the whole is formed by pressure to form a block in which a thin plate of pure bentonite is integrally provided around.
【請求項4】 ブロック成形のための型枠内に礫混入ベ
ントナイト混合土を投入し、加圧成形してブロックを成
形し、このブロックの周面に純ベントナイトを吹き付け
て純ベントナイトの薄板が一体的に周囲に設けられたブ
ロックとすることを特徴とするブロックの製造方法。
4. A mixture of bentonite-mixed soil with gravel is put into a mold for forming a block, and the block is formed by pressure molding, and pure bentonite is sprayed on the peripheral surface of the block to form a thin plate of pure bentonite. A method for manufacturing a block, wherein the block is provided around the periphery.
【請求項5】 ブロック成形のための型枠内に礫混入ベ
ントナイト混合土を投入し、加圧成形してブロックを成
形し、他方、純ベントナイトの薄板を別体として加圧成
形し、この純ベントナイトの薄板を前記ブロックの周面
に、ベントナイトの水溶液等を接着剤として取り付け
て、純ベントナイトの薄板が一体的に周囲に設けられた
ブロックとすることを特徴とするブロックの製造方法。
5. A bentonite-mixed soil mixed with gravel is put into a mold for forming a block, and the block is formed by pressure forming. On the other hand, a thin plate of pure bentonite is separately formed and press-formed. A method for producing a block, wherein a thin plate of bentonite is attached to the peripheral surface of the block as an adhesive with an aqueous solution of bentonite as an adhesive to form a block in which a thin plate of pure bentonite is integrally provided around.
JP36987898A 1998-12-25 1998-12-25 Method of backfilling and method of manufacturing blocks used therefor Expired - Fee Related JP4060471B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP36987898A JP4060471B2 (en) 1998-12-25 1998-12-25 Method of backfilling and method of manufacturing blocks used therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP36987898A JP4060471B2 (en) 1998-12-25 1998-12-25 Method of backfilling and method of manufacturing blocks used therefor

Publications (2)

Publication Number Publication Date
JP2000193796A true JP2000193796A (en) 2000-07-14
JP4060471B2 JP4060471B2 (en) 2008-03-12

Family

ID=18495542

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP4060471B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006326525A (en) * 2005-05-27 2006-12-07 Shimizu Corp Manufacturing method of large-sized block of clay-based hardly-permeable material and fixing method
WO2007020868A1 (en) 2005-08-19 2007-02-22 Kajima Corporation Method of spray application, and spray apparatus, for bentonite material
JP2007050381A (en) * 2005-08-19 2007-03-01 Kajima Corp Method for developing waste treatment facility
CN113803079A (en) * 2021-09-22 2021-12-17 中铁十四局集团大盾构工程有限公司 Method for maintaining tunnel face mud film during cabin opening operation of large-diameter slurry shield under pressure

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006326525A (en) * 2005-05-27 2006-12-07 Shimizu Corp Manufacturing method of large-sized block of clay-based hardly-permeable material and fixing method
JP4552136B2 (en) * 2005-05-27 2010-09-29 清水建設株式会社 Manufacturing method for large blocks of clay-based hardly permeable materials
WO2007020868A1 (en) 2005-08-19 2007-02-22 Kajima Corporation Method of spray application, and spray apparatus, for bentonite material
JP2007050381A (en) * 2005-08-19 2007-03-01 Kajima Corp Method for developing waste treatment facility
JP4842271B2 (en) * 2005-08-19 2011-12-21 鹿島建設株式会社 Spraying method and spraying apparatus for bentonite materials
US8470406B2 (en) 2005-08-19 2013-06-25 Kajima Corporation Method of spray application, and spray apparatus, for bentonite material
CN113803079A (en) * 2021-09-22 2021-12-17 中铁十四局集团大盾构工程有限公司 Method for maintaining tunnel face mud film during cabin opening operation of large-diameter slurry shield under pressure

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