JPS6321765B2 - - Google Patents
Info
- Publication number
- JPS6321765B2 JPS6321765B2 JP55147378A JP14737880A JPS6321765B2 JP S6321765 B2 JPS6321765 B2 JP S6321765B2 JP 55147378 A JP55147378 A JP 55147378A JP 14737880 A JP14737880 A JP 14737880A JP S6321765 B2 JPS6321765 B2 JP S6321765B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- water
- drainage hole
- amount
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000004568 cement Substances 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 239000002562 thickening agent Substances 0.000 claims description 24
- 230000005484 gravity Effects 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000010998 test method Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 6
- 229920002401 polyacrylamide Polymers 0.000 description 6
- 238000002156 mixing Methods 0.000 description 5
- 239000002689 soil Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 235000011201 Ginkgo Nutrition 0.000 description 1
- 244000194101 Ginkgo biloba Species 0.000 description 1
- 235000008100 Ginkgo biloba Nutrition 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000007900 aqueous suspension Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 125000003367 polycyclic group Chemical group 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Description
本発明は、地山の地辷りを防止するための地中
排水孔の施工法に関する。
地辷り災害の原因は、地層内の含水帯域による
土砂の摩擦力と粘着力の低下に基づく場合が多
い。このため、地山内の含水を抜くことがこれを
防止する上で有効である。従来、これを目的とし
て塩ビ管等の管材を地山表面からやや上向きに傾
斜して地中内に挿入することが行なわれたが、こ
の排水管の使用ではフイルター機能が果たせない
ので、土砂が地下水と共に流出して地山の土砂が
緩み、また排水管が詰つてその役目を果たさなく
なる欠点がある。
この欠点を解消するには、排水孔道内に水を透
過させ且つ地盤土砂の細粒子を流出させないフイ
ルター機能をもつた透水コンクリートを打設する
ことが有益である。水透過能力を有する所定の空
隙率をもつたコンクリートを作るには、粗骨材と
細骨材の配合量や水セメント比を変えて、粗骨材
粒子表面にセメントペーストを付着させ、このペ
ーストが付着した粗骨材同志の間で空隙が形成で
きるような超かた練りのコンクリートを形成する
ことによつて行ない得る。
しかし、このような粗骨材粒子表面にペースト
を付着した超かた練りのコンクリートを含水孔道
内に挿入しても、この粒子表面が水流で洗らわれ
てセメント粒子が粗骨材表面から遊離し、これが
下流（注入口側）に流れて排出孔道を閉塞するこ
とになるので、長い透水孔道を形成することは困
難である。
本発明はこの問題を解決することを目的として
なされたもので、地中の含水帯域においても粗骨
材粒子表面からペーストが遊離しないようにして
所定の空隙率をもつた透水コンクリート排水孔を
有利に施工する方法を提供するものである。すな
わち、地山表面から地中内の含水帯域にまで水平
もしくは傾斜（上下いづれかに傾斜）した排水孔
道を穿孔し、この排水孔道内に透水コンクリート
を挿入することからなる地中排水孔の施工法にお
いて、本発者明の工法は、400c.c.の水を入れた直
径５cm高さ40cmの円筒容器内に水セメント比60％
のセメントペースト400c.c.を水面上より流下させ
たあとこれを静置して硬化させ、セメント硬化体
の最上部５cmの範囲と最下部５cmの範囲から試料
を採取してその比重を測定する試験法に従つたと
きに、セメント粒子間を粘着して両試料の比重差
を0.1以下とするような粘稠剤を、セメントとの
重量比で0.2〜4.0％配合し、かつ、粗骨材最大寸
法10〜20mm、単位粗骨材量1100〜1800Kg／m3、単
位セメント量250〜400Kg／m3、単位水量80〜140
Kg／m3としたうえで15〜35％の空隙率が得られる
ように細骨材を配合して空隙を有する生コンクリ
ートを作成し、この生コンクリートを地山内に穿
孔した排水孔道内に注入または圧入することを特
徴とする。
この本発明で使用する粘稠剤としては、ポリビ
ニルアルコール、ポリアクリルアミド、ポリ酸化
エチレン、ポリアクリル酸ソーダ、カルボキシメ
チルセルロース、メチルセルロース、およびこれ
らに代表されるセルロースエーテル類、アルギン
酸ソーダ、グアゴム、朝鮮銀杏草またはこれらに
類する粘稠剤が挙げられ、これらを前記条件を満
足するように単独または複合して（２種以上）添
加する。そのさい、コンクリート用分散剤例え
ば、高分子芳香族スルフオン化物、多環アロマス
ルフオン酸塩、メラミンスルフオン酸塩などを適
量添加するのがよい。また、粘稠剤の種類によつ
ては徴細な気泡を運行するものがあるが、この場
合には消泡剤例えば、ジブチルフタレート、非水
溶性アルコール類、トリブチルフオスフエート、
シリコンなどを用いるとよい。また、粘稠剤の種
類によつてはセメントの凝縮を遅らせる場合があ
るが、このような場合には少量の急結剤例えば、
塩化カルシウム、けい酸ソーダ、アルミン酸塩ソ
ーダ、などを添加するとよい。さらに、粘稠剤の
種類によつては、コンクリートのコンシステンシ
ーを低下させるような場合には公知の減水剤の併
用も好ましい。いづれにしても、これら各種の追
添剤の併用が粘稠剤本来のセメント粒子間の粘着
効果を妨げることがないようにしなければなら
ず、前記の試験方法に従つたときの比重差0.1以
下の条件に合致するように粘稠剤の種類と添加量
と選定し、この選定した粘稠剤に応じて、前記各
種の追添剤をこの粘稠効果が損なわれない範囲で
添加することが重要である。なお、使用するセメ
ントは従来公知の常用セメントが使用できるが、
その１部をフライアツシユ、水砕スラグ粉末、シ
リカ質混合材などで置換することができ、この置
換によつて本発明の目的が有利に達成される場合
もある。
粘稠剤の配合にさいし注意すべきことは、その
種類に応じた混合手順である。通常のコンクリー
トミキサーによる混合では水への溶解がし難い粘
稠剤の場合には、予めこの粘稠剤を水と混合して
水溶液または懸濁液の形態にしてから、これを生
コンクリートに添加する方がよい。しかし、水を
除く他の材料を先によく混合したあとで、水を投
入して混合した方がよい場合もある。いづれの混
合手順を採るかは粘稠剤の種類に応じて決めれば
よい。
本発明者らの試験によると、前記の試験方法で
採取した試料の比重差が0.1以下となるように粘
稠剤を配合し、空隙率15〜35％の生コンクリート
が得られるように、粗骨材最大寸法10〜25mm、単
位セメント量250〜400Kg／m3、単位水量80〜140
Kg／m3、単位粗骨材量1100〜1800Kg／m3対して、
単位細骨材量を適正に選定して混練し、粗骨材の
表面にペーストが付着した形態の空隙を有するか
た練りの生コンクリートを作つた場合に、これを
水流のあるところに挿入してもペーストが粗骨材
表面から流出することなく、セメント粒子が骨材
表面に粘着されたままで硬化反応が進行し、十分
に強固な透水コンクリートが得られることを確認
した。しかし、前記の比重差が0.1を超えるよう
な条件では実施工において骨材表面に付着したセ
メント粒子が地下水に洗らわれて信頼度の高い透
水コンクリートの排水孔施工ができない。
比重差を0.1以下とするための粘稠剤の添加量
は、粘稠剤のセメント粘着効果の高低に応じて変
化するが、生コンクリート中のセメントに対する
重量比で0.2％未満ではこのような効果を発揮す
ることができず、4.0％を超える量の添加ではセ
メントの硬化反応を遅延させるような事態も生じ
て実用的ではない。しかし、この添加量はこの粘
稠剤がセメントと十分に混合されたことを前提と
するものであり、混合が不十分な場合または十分
に混合しても均一にセメント微粒子と混ざり合わ
ないような粘稠剤の場合にはこの添加量の範囲に
こだわらずに添加する必要がある。しかし、前記
の試験法に従つたときに比重差が0.1以下となる
条件を満たさねばならない。換言すれば、該試験
法で比重差が0.1以下となる条件を満たすことが
必須の要件であり、この要件を満たす限りにおい
て、実操業上好ましくは、生コンクリート中のセ
メントに対する重量比で0.2〜4.0％の粘稠剤を添
加すればよいことになる。この範囲の添加混合に
よつて、地中の含水帯域においてもこの排水孔道
内の水洗に洗われることなくペーストが粗骨材粒
子に付着したままで所定の空隙率を保持して硬化
し、所要の排水孔が形成できる。
本発明の施工にあたつては、例えば第１図に示
すような、切取面１を有する地山表面において、
含水地層３例えば地上りを起し易い箇所にまで切
取面１から試錐して、水平、上向きまたは下向き
の排水孔道４を穿孔し、この排水孔道４に対し
て、例えば第２図のようにして本発明に従う透水
コンクリート２を挿入する。第２図において、５
は排水孔道４に挿入した注入管であり、ホツパー
８からこの注入管５内に流し込んだ透水コンクリ
ートを押棒６によつて排水孔道４内に挿入する例
を示している。
試験例
ポルトランドセメントに水を加えて水セメント
比60％のペーストを作り、これに粘稠剤としてポ
リアクリルアミドを添加混合した。これを400c.c.
の水を入れた直径５cm高さ40cmの円筒内に400c.c.
水面上より流下させ、静置して硬化させたあと最
上部５cmと最下部５cmの範囲から試料を採取し、
その比重差を測定した。ポリアクリルアミドの対
セメント重量比（百分率）と比重差の関係を第３
図に示した。ポリアクリルアミドの添加量が対セ
メント比で2.4％以上で両試料の比重差が0.1以下
となつた。
以上の試験結果に基づき、第１表のような配合
でポリアクリルアミドを添加した生コンクリート
を作り、これを水槽内において1.5ｍ／secの水流
を与えながら硬化させた。得られた透水コンクリ
ートの強度を第２表に、またその透水係数を第３
表に示した。
TECHNICAL FIELD The present invention relates to a method for constructing underground drainage holes to prevent landslides in the ground. The cause of landslide disasters is often due to a decrease in the frictional force and adhesion of soil due to water-containing zones within the strata. For this reason, removing water from the ground is effective in preventing this. Conventionally, for this purpose, pipe materials such as PVC pipes were inserted into the ground at a slight upward slope from the surface of the ground, but using this type of drainage pipe does not function as a filter, so it is difficult to remove soil. It has the disadvantage that it flows out with groundwater, loosening the soil in the ground, and clogging drain pipes, making them useless. In order to eliminate this drawback, it is beneficial to cast water-permeable concrete that has a filter function that allows water to permeate into the drainage hole and prevents fine particles of soil from flowing out. To make concrete with a predetermined porosity and water permeability, cement paste is attached to the surface of the coarse aggregate particles by changing the blending amount of coarse aggregate and fine aggregate and the water-cement ratio. This can be done by forming super-hard concrete that allows voids to be formed between the coarse aggregates to which they are attached. However, even if super-hardened concrete with paste attached to the surface of coarse aggregate particles is inserted into a water-containing hole, the surface of these particles will be washed away by the water flow and the cement particles will be released from the surface of the coarse aggregate. However, this flows downstream (inlet side) and blocks the discharge hole, making it difficult to form a long water permeation hole. The present invention was made with the aim of solving this problem, and it is advantageous to create water-permeable concrete drainage holes with a predetermined porosity so that the paste will not be released from the surface of the coarse aggregate particles even in the water-containing zone underground. This provides a method for construction. In other words, this is a construction method for underground drainage holes that involves drilling a horizontal or sloping drainage hole path from the surface of the ground to the water-containing zone in the ground, and inserting permeable concrete into the drainage hole path. In the method proposed by the present inventor, a water-cement ratio of 60% is placed in a cylindrical container with a diameter of 5 cm and a height of 40 cm containing 400 c.c. of water.
After 400 c.c. of cement paste is allowed to flow down from above the water surface, it is allowed to stand and harden. Samples are taken from the top 5 cm and bottom 5 cm of the hardened cement and their specific gravity is measured. When following the test method, a thickening agent that sticks between cement particles and makes the difference in specific gravity of both samples 0.1 or less is mixed in a weight ratio of 0.2 to 4.0% with cement, and coarse aggregate. Maximum dimension 10~20mm, unit coarse aggregate amount 1100~1800Kg/ m3 , unit cement amount 250~400Kg/ m3 , unit water amount 80~140
Kg/ m3 , mix fine aggregate to obtain a porosity of 15 to 35% to create ready-mixed concrete with voids, and pour this ready-mixed concrete into a drainage hole drilled into the ground. Or it is characterized by being press-fitted. Thickening agents used in the present invention include polyvinyl alcohol, polyacrylamide, polyethylene oxide, sodium polyacrylate, carboxymethyl cellulose, methyl cellulose, cellulose ethers represented by these, sodium alginate, guar gum, Korean ginkgo herb. Alternatively, thickeners similar to these may be mentioned, and these may be added singly or in combination (two or more types) so as to satisfy the above conditions. At this time, it is preferable to add an appropriate amount of a dispersant for concrete, such as a polymeric aromatic sulfonate, a polycyclic aromatic sulfonate, or a melamine sulfonate. In addition, some thickening agents move fine bubbles, and in this case antifoaming agents such as dibutyl phthalate, water-insoluble alcohols, tributyl phosphate,
It is preferable to use silicon or the like. Also, depending on the type of thickening agent, it may delay the condensation of cement, but in such cases, a small amount of quick-setting agent, for example,
Calcium chloride, sodium silicate, sodium aluminate, etc. may be added. Furthermore, depending on the type of thickening agent, if the consistency of concrete is reduced, it is also preferable to use a known water reducing agent in combination. In any case, it must be ensured that the combined use of these various additives does not interfere with the adhesive effect between cement particles inherent to the thickener, and that the specific gravity difference when following the test method described above is 0.1 or less. The type and amount of the thickening agent to be added should be selected to meet the above conditions, and depending on the selected thickening agent, the various additives mentioned above can be added within a range that does not impair the thickening effect. is important. In addition, conventionally known common cement can be used as the cement, but
Part of it can be replaced by fly ash, granulated slag powder, siliceous mixture, etc., and the objects of the invention may be advantageously achieved by this replacement. When blending thickeners, it is important to pay attention to the mixing procedure depending on the type of thickener. In the case of a thickening agent that is difficult to dissolve in water when mixed with a normal concrete mixer, mix this thickening agent with water in advance to form an aqueous solution or suspension, and then add this to the ready-mixed concrete. It's better to. However, it may be better to mix the other ingredients thoroughly first, and then add water and mix. The mixing procedure to be adopted can be determined depending on the type of thickening agent. According to the tests conducted by the present inventors, thickening agents were mixed so that the difference in specific gravity of the samples collected by the above test method was 0.1 or less, and rough concrete was mixed to obtain ready-mixed concrete with a porosity of 15 to 35%. Maximum aggregate size 10~25mm, unit cement amount 250~400Kg/ m3 , unit water amount 80~140
Kg/ m3 , unit coarse aggregate amount 1100-1800Kg/ m3 ,
When the amount of fine aggregate per unit is appropriately selected and mixed to create ready-mixed concrete with voids in the form of paste attached to the surface of the coarse aggregate, insert this into a place where there is a stream of water. It was confirmed that the paste did not flow out from the surface of the coarse aggregate, and the curing reaction proceeded while the cement particles remained attached to the surface of the aggregate, resulting in sufficiently strong water-permeable concrete. However, under conditions where the specific gravity difference exceeds 0.1, the cement particles adhering to the surface of the aggregate will be washed away by groundwater during construction, making it impossible to construct drainage holes in water-permeable concrete with high reliability. The amount of thickener added to reduce the specific gravity difference to 0.1 or less varies depending on the cement adhesion effect of the thickener, but if the weight ratio of the thickener to cement in fresh concrete is less than 0.2%, such an effect will not occur. If added in an amount exceeding 4.0%, the hardening reaction of cement may be delayed, making it impractical. However, this addition amount is based on the assumption that the thickening agent has been sufficiently mixed with the cement, and there may be cases where the thickening agent is insufficiently mixed, or even if it is mixed sufficiently, it does not mix uniformly with the cement particles. In the case of a thickening agent, it is necessary to add it without being particular about this range of addition amount. However, the conditions must be met so that the difference in specific gravity is 0.1 or less when the above test method is followed. In other words, it is essential to satisfy the condition that the specific gravity difference is 0.1 or less in this test method, and as long as this requirement is met, it is preferable for actual operation to have a weight ratio of 0.2 to 0.2 to cement in fresh concrete. It is sufficient to add 4.0% thickening agent. By adding and mixing in this range, even in the underground water-containing zone, the paste remains attached to the coarse aggregate particles without being washed away by water in the drainage holes, and hardens while maintaining the specified porosity. drainage holes can be formed. In the construction of the present invention, for example, on the ground surface having a cut surface 1 as shown in FIG.
A horizontal, upward or downward drainage hole path 4 is drilled from the cut surface 1 to a location where the water-containing stratum 3 is likely to surface, for example, and a horizontal, upward or downward drainage hole path 4 is drilled, for example, as shown in Fig. 2. Insert the permeable concrete 2 according to the invention. In Figure 2, 5
1 is an injection pipe inserted into the drainage hole channel 4, and shows an example in which permeable concrete poured into the injection pipe 5 from a hopper 8 is inserted into the drainage hole channel 4 by a push rod 6. Test Example Water was added to Portland cement to make a paste with a water-to-cement ratio of 60%, and polyacrylamide was added and mixed as a thickening agent. This is 400c.c.
400 c.c. in a cylinder with a diameter of 5 cm and a height of 40 cm filled with water.
After letting it flow down from above the water surface and allowing it to harden, samples were collected from the top 5cm and bottom 5cm.
The difference in specific gravity was measured. The relationship between the weight ratio (percentage) of polyacrylamide to cement and the difference in specific gravity is shown in the third section.
Shown in the figure. When the amount of polyacrylamide added was 2.4% or more relative to cement, the difference in specific gravity between the two samples was 0.1 or less. Based on the above test results, ready-mixed concrete containing polyacrylamide was prepared according to the composition shown in Table 1, and was cured in a water tank while being supplied with a water flow of 1.5 m/sec. The strength of the obtained permeable concrete is shown in Table 2, and its permeability coefficient is shown in Table 3.
Shown in the table.
【表】【table】
【表】【table】
【表】
第２、３表の結果から明らかなように、1.5
ｍ／sec水流中で空隙率31.7％の生コンクリート
を硬化させたにもかかわらず、十分な強度と透水
係数を有する透水コンクリート硬化体が得られ
た。したがつて、この生コンクリートを地中の含
水帯域に穿孔した排水孔道に挿入すると、十分に
信頼できる排水孔が形成できる。[Table] As is clear from the results in Tables 2 and 3, 1.5
Even though fresh concrete with a porosity of 31.7% was cured in a water flow of m/sec, a cured water-permeable concrete with sufficient strength and permeability coefficient was obtained. Therefore, when this ready-mixed concrete is inserted into a drainage hole drilled in a water-containing zone of the earth, a sufficiently reliable drainage hole can be formed.
第１図は本発明施工法の例を示す概略断面図、
第２図は第１図の工法における透水コンクリート
挿入法を示す概略断面図、第３図はポリアクリル
アミド添加量と比重差との関係図である。
１…切取面、２…透水生コンクリート、３…含
水帯域、４…排水孔道、５…注入管、６…押棒。
FIG. 1 is a schematic sectional view showing an example of the construction method of the present invention;
FIG. 2 is a schematic sectional view showing the method of inserting permeable concrete in the construction method shown in FIG. 1, and FIG. 3 is a diagram showing the relationship between the amount of polyacrylamide added and the difference in specific gravity. 1... cut surface, 2... permeable fresh concrete, 3... water-containing zone, 4... drainage hole, 5... injection pipe, 6... push rod.
Claims (1)
の排水孔道内に透水コンクリートを挿入すること
からなる地中排水孔の施工法において、 400c.c.の水を入れた直径５cm高さ40cmの円筒容
器内に水セメント比60％のセメントペースト400
c.c.を水面上より流下させたあとこれを静置して硬
化させ、このセメント硬化体の最上部５cmの範囲
と最下部５cmの範囲から試料を採取してその比重
を測定する試験法に従つたときに、セメント粒子
間を粘着して両試料の比重差を0.1以下とするよ
うな粘稠剤を、セメントとの重量比で0.2〜4.0％
配合して生コンクリートを形成し、 粗骨材最大寸法10〜20mm、単位粗骨材量1100〜
1800Kg／m3、単位セメント量250〜400Kg／m3、単
位水量80〜140Kg／m3としたうえで15〜35％の空
隙率が得られるように単位細骨材量を選定して空
隙を有する生コンクリートを作成し、 得られた生コンクリートを前記の排水孔道内に
打設することを特徴とする地中排水孔の施工法。[Scope of Claims] 1. A method of constructing an underground drainage hole, which consists of drilling a horizontal or inclined drainage hole path and inserting permeable concrete into the drainage hole path, in which a hole with a diameter of 5 cm filled with 400 c.c. 400 ml of cement paste with a water-cement ratio of 60% in a cylindrical container with a height of 40 cm
A test method was followed in which cc was allowed to flow down from above the water surface, allowed to stand and harden, and samples were taken from the top 5 cm and bottom 5 cm of the hardened cement and their specific gravity was measured. Sometimes, a thickening agent that sticks between cement particles and makes the difference in specific gravity between the two samples 0.1 or less is added at a weight ratio of 0.2 to 4.0% to the cement.
Mix to form ready-mixed concrete, coarse aggregate maximum dimension 10~20mm, unit coarse aggregate amount 1100~
1800Kg/m 3 , unit cement amount 250-400Kg/m 3 , unit water amount 80-140Kg/m 3 , and select the unit amount of fine aggregate to obtain a porosity of 15-35% to eliminate voids. A method for constructing an underground drainage hole, which comprises: preparing ready-mixed concrete having the following properties; and pouring the obtained ready-mixed concrete into the drainage hole path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14737880A JPS5771933A (en) | 1980-10-21 | 1980-10-21 | Construction of underground drainage hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14737880A JPS5771933A (en) | 1980-10-21 | 1980-10-21 | Construction of underground drainage hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5771933A JPS5771933A (en) | 1982-05-06 |
| JPS6321765B2 true JPS6321765B2 (en) | 1988-05-09 |
Family
ID=15428880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14737880A Granted JPS5771933A (en) | 1980-10-21 | 1980-10-21 | Construction of underground drainage hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5771933A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6128624A (en) * | 1984-07-16 | 1986-02-08 | Kajima Corp | Slope-stabilizing construction |
| JP3507201B2 (en) * | 1995-07-13 | 2004-03-15 | 太平洋セメント株式会社 | Cement composition |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5550090A (en) * | 1978-10-07 | 1980-04-11 | Kloeckner Humboldt Deutz Ag | Apparatus for vaporizing carbon by molten metal bath |
-
1980
- 1980-10-21 JP JP14737880A patent/JPS5771933A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5550090A (en) * | 1978-10-07 | 1980-04-11 | Kloeckner Humboldt Deutz Ag | Apparatus for vaporizing carbon by molten metal bath |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5771933A (en) | 1982-05-06 |
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