JPH0473320A - Preparation of cast-in-place concrete pile - Google Patents
Preparation of cast-in-place concrete pileInfo
- Publication number
- JPH0473320A JPH0473320A JP18755090A JP18755090A JPH0473320A JP H0473320 A JPH0473320 A JP H0473320A JP 18755090 A JP18755090 A JP 18755090A JP 18755090 A JP18755090 A JP 18755090A JP H0473320 A JPH0473320 A JP H0473320A
- Authority
- JP
- Japan
- Prior art keywords
- bottomed cylindrical
- cylindrical bag
- concrete
- pile
- pile hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 239000000835 fiber Substances 0.000 abstract description 2
- 229920003002 synthetic resin Polymers 0.000 abstract description 2
- 239000000057 synthetic resin Substances 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 229910000278 bentonite Inorganic materials 0.000 description 5
- 239000000440 bentonite Substances 0.000 description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 5
- 239000003673 groundwater Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 210000003462 vein Anatomy 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、横遺物基礎の構築に際して設けられる現場打
コンクリート杭の造成方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for constructing cast-in-place concrete piles to be provided when constructing a horizontal relic foundation.
（従来の技術）
従来、地表より掘削した杭穴に現場打コンクリートを打
設して杭を造成する方法として、ベントナイト液等の泥
水で充満された杭穴に直接補強鉄筋を建込み、しかる後
にコンクリートを打設する方法がある。(Conventional technology) Conventionally, as a method of constructing piles by pouring cast-in-place concrete into pile holes excavated from the ground surface, reinforcing steel bars are built directly into the pile holes filled with muddy water such as bentonite liquid, and then There is a method of pouring concrete.
ベントナイト液中でコンフートを打設する方法としては
、杭穴の底部まで打設管を挿入し、該打設管を除々に引
き上げながら下方に向けてコンクリートを打設する方法
が用いられている。As a method of pouring concrete in bentonite liquid, a method is used in which a pouring tube is inserted to the bottom of a pile hole, and concrete is poured downward while gradually pulling up the pouring tube.
（発明が解決しようとする課題）
前述した杭穴に現場打コンクリートを打設する杭の従来
の造成方法は、泥水の使用によりゲージング等の孔壁の
保護材が不要で、かつ孔壁の止水効果も得られる。また
、前述の方法は小規模の機械により実施することができ
るため、高速なアースドリル等による掘削と併用するこ
とにより工期の短縮化と機動性を持たせた工事が可能と
なっている。(Problems to be Solved by the Invention) The conventional method for building piles, which involves pouring cast-in-place concrete into the pile holes described above, uses muddy water, which eliminates the need for protective materials for the hole walls such as gauging, and also prevents the holes from being blocked. You can also get water effects. Furthermore, since the above-mentioned method can be carried out using small-scale machines, it is possible to shorten the construction period and perform construction with greater mobility by using it in conjunction with excavation using a high-speed earth drill or the like.
しかしながら、前述した方法においても、杭穴が地下水
脈層を横切ったり、あるいは横切る地層の一部にひび割
れ等の空隙がある場合には、泥水の孔壁防護の効果も十
分に機能せず、地下水か打設中のコンクリートに侵入し
て水セメント比が大となる、所謂レイタンス現象が生じ
てコンクリート強度が低下したり、打設中のコンクリー
トが地下水脈により、又は地層のひび等の空隙がち流出
し、コンクリートの打設量が増えるという問題があった
。さらにまた泥水中に鉄筋を直接挿入するなめ、鉄筋の
表面に泥を巻き込んだままコンクリートか打設され、鉄
筋とコンクリートの結合度が弱くなるという問題があっ
た。However, even with the method described above, if the pile hole crosses the groundwater vein layer, or if there are cracks or other voids in a part of the stratum that it crosses, the effect of protecting the hole wall from muddy water will not function sufficiently, and the groundwater Otherwise, the so-called laitance phenomenon occurs, in which the water-cement ratio increases due to penetration into the concrete being poured, resulting in a decrease in the strength of the concrete, or the concrete being poured is washed away by underground water veins or from voids such as cracks in the strata. However, there was a problem that the amount of concrete to be poured increased. Furthermore, since the reinforcing bars are inserted directly into muddy water, concrete is poured with mud still entrapped on the surface of the reinforcing bars, which weakens the bond between the reinforcing bars and the concrete.
本発明は、かかる問題を解決するためになされたもので
あり、杭穴中の泥水の存在及び杭穴を含む周囲の土質等
の地下構造に影響されず、内部に泥を巻き込むことのな
い均一で良質なコンクリートが得られるとともに、杭穴
外部へのコンクリートの流出の虞れのない現場打コンク
リートの造成方法を提供せんとするものである。The present invention was made to solve this problem, and is not affected by the presence of muddy water in the pile hole or the underground structure such as the surrounding soil including the pile hole, and is uniform in that it does not involve mud inside the pile hole. It is an object of the present invention to provide a method for creating cast-in-place concrete in which high-quality concrete can be obtained without the risk of concrete flowing out to the outside of the pile hole.
（課題を解決するための手段）
上述の如き従来の問題を解決し、所期の目的を達成する
ための本発の現場打コンクリート杭の造成方法の特徴は
、地表より掘削した杭穴内に必要な補強鉄筋を挿入する
とともに、該杭穴内にコンクリートを打設する現場打コ
ンクリート杭の造成方法において、前記杭穴内に不透水
性シート材をもって有底筒状に成形され、直径が前述し
な杭穴内径より大きく成形した有底筒袋を挿入し、該有
底筒袋内に必要な補強鉄筋を収容してコンクリートを打
設し、前記有底筒袋を膨張させて杭穴内面に密着させる
ことにある。(Means for solving the problem) The characteristics of the method for constructing cast-in-place concrete piles that we developed in order to solve the conventional problems as mentioned above and achieve the intended purpose are as follows: In a method for constructing cast-in-place concrete piles, in which reinforcing reinforcing bars are inserted and concrete is poured into the pile hole, the pile is formed into a bottomed cylindrical shape with an impermeable sheet material in the pile hole, and the pile has a diameter not specified above. A bottomed cylindrical bag formed larger than the inner diameter of the hole is inserted, the necessary reinforcing reinforcing bars are housed in the bottomed cylindrical bag, concrete is poured, and the bottomed cylindrical bag is expanded to adhere tightly to the inner surface of the pile hole. There is a particular thing.
（作用）
本発明においては、杭穴内に不透水性の有底筒袋を挿入
することにより、該有底筒袋の内部と外部を遮断してい
る。従って、該有底筒袋の内部に配された鉄筋及び打設
されたコンクリートは、該有底筒袋の外部にある泥水あ
るいは地下水脈がら侵入してくる地下水等の影響を受け
ることかない。(Function) In the present invention, by inserting a water-impermeable bottomed cylindrical bag into the pile hole, the inside and outside of the bottomed cylindrical bag are isolated. Therefore, the reinforcing bars placed inside the bottomed cylindrical bag and the poured concrete are not affected by muddy water or groundwater entering from the groundwater vein outside the bottomed cylindrical bag.
同様に孔壁の一部に空隙に連なる地層のひび等が存在し
ても、該有底筒袋の筒壁か前記空隙に接して塞ぐので、
無駄なコンクリートの流出も避けることができる。Similarly, even if there is a crack in the stratum that connects to the void in a part of the hole wall, the cylindrical wall of the bottomed cylindrical bag contacts the void and closes it.
Unnecessary concrete spillage can also be avoided.
さらに、有底筒袋の底面の直径及び筒部の直径が杭穴内
径よりも大きく成形されているため、該有底筒袋に打設
されたコンクリート圧が有底筒袋の筒壁を杭穴の孔壁に
強く押し付け、全体として杭穴の孔壁と前記筒壁が隙間
なく密着している杭が造成される。Furthermore, since the bottom diameter of the bottomed cylindrical bag and the diameter of the cylindrical part are formed larger than the inside diameter of the pile hole, the concrete pressure poured into the bottomed cylindrical bag causes the cylindrical wall of the bottomed cylindrical bag to pile up. By strongly pressing against the wall of the hole, a pile is created in which the hole wall of the pile hole and the cylindrical wall are in close contact with each other without any gaps.
また、有底筒袋の外周面の面を粗くすれば杭としての周
面摩擦力は大きくなるが、孔壁に喰い込む突起を有底筒
袋の外周に多数配置すれば、周面摩擦力はより大きくな
る。In addition, if the outer peripheral surface of the bottomed cylindrical bag is made rough, the peripheral surface frictional force as a pile will increase, but if a large number of protrusions that bite into the hole wall are arranged on the outer periphery of the bottomed cylindrical bag, the peripheral surface frictional force will increase. becomes larger.
（実施例）
次に本発明の実施の一例を第１図〜第５図について説明
する。(Example) Next, an example of implementation of the present invention will be described with reference to FIGS. 1 to 5.
図において、１０は地表より適宜掘削機を使用して成形
した杭穴であり、この杭穴１０にはベントナイト液から
なる泥水１１を満し、孔壁の崩落を防止している。In the figure, numeral 10 indicates a pile hole formed from the ground surface using an appropriate excavator, and this pile hole 10 is filled with muddy water 11 made of bentonite liquid to prevent the wall of the hole from collapsing.
この杭穴１０のコンクリート打設に先立ち、第１図に示
すように有底筒袋１２を挿入し、さらに該有底筒袋１２
内に鉄筋１３を建込む６次いで第２図に示すようにコン
クリート１４を有底筒袋１２内に、その底部より打設す
る。Prior to placing concrete in the pile hole 10, a bottomed cylindrical bag 12 is inserted as shown in FIG.
Concrete 14 is then poured into the bottomed cylindrical bag 12 from the bottom, as shown in FIG.
前記有底筒袋１２は、耐食性の強化合成樹脂繊維を使用
した不透水性のシート材をもって有底筒状に成形された
ものを使用している。また、この有底筒ｇｋ１２には、
その直径が杭穴１ｏの内径よりも大きく成形されている
。このため第３図に示すように前記有底筒袋１２内にコ
ンクリートが打設されると、コンクリート圧により有底
筒袋１２は拡げられて杭穴１０の孔壁に押し付けられ、
杭穴１０の孔壁と有底筒袋１２の外周が密着して接する
コンクリート杭が造成される。The bottomed cylindrical bag 12 is formed from a water-impermeable sheet material made of corrosion-resistant reinforced synthetic resin fibers into a bottomed cylindrical shape. In addition, this bottomed cylinder gk12 has
The diameter thereof is formed larger than the inner diameter of the pile hole 1o. Therefore, as shown in FIG. 3, when concrete is poured into the bottomed tube bag 12, the bottomed tube bag 12 is expanded by concrete pressure and pressed against the hole wall of the pile hole 10.
A concrete pile is constructed in which the hole wall of the pile hole 10 and the outer periphery of the bottomed cylindrical bag 12 are in close contact with each other.
本実施例では、杭穴に挿入した有底筒袋１２の中に鉄筋
を建込んでいるが、筆状に成形しておいた鉄筋篭を予め
有底筒袋１２内に収容し、しかる後に該有底筒袋１２を
杭穴１０中に挿入してもよい。In this embodiment, the reinforcing bars are built into the bottomed cylindrical bag 12 inserted into the pile hole, but the reinforcing bar cage, which has been shaped into a brush shape, is stored in the bottomed cylindrical bag 12 in advance, and then The bottomed cylindrical bag 12 may be inserted into the pile hole 10.
また、第４図に示すように、有底筒袋１２の外周面に杭
穴１０の孔壁に喰い込む突起１５を多数一体に突設して
おけば、大きな周面摩擦力を得ることができる。この突
起１５は第５図に示すように有底筒袋１２を貫通させて
リベット状に固着してもよい。Further, as shown in FIG. 4, if a large number of protrusions 15 that bite into the hole wall of the pile hole 10 are integrally provided on the outer circumferential surface of the bottomed cylindrical bag 12, a large circumferential surface friction force can be obtained. can. The protrusion 15 may be fixed in the form of a rivet by penetrating the bottomed cylindrical bag 12 as shown in FIG.
（発明の効果）
上述の如く本発明の現場打コンクリート杭の造成方法に
よれば、杭内に充満したベントナイト液、地下水脈から
侵入する地下水の侵入等にかかわらず、ベントナイト液
の巻き込みのない均一で良質なコンクリート杭が得られ
る。(Effects of the Invention) As described above, according to the method for constructing cast-in-place concrete piles of the present invention, regardless of the bentonite liquid filling the pile or the intrusion of groundwater from underground water veins, bentonite liquid is uniformly produced without entrainment. high quality concrete piles can be obtained.
また、コンクリート打設中にコンクリートが杭穴外部へ
流出がすることがないので、無駄なコンクリートの打設
を避けることができ、経済的である。Furthermore, since concrete does not flow out of the pile hole during concrete placement, unnecessary concrete placement can be avoided, which is economical.
図面は本発明の実施例を示すもので、第１図は杭穴内に
有底筒袋及び鉄筋篭を挿入した状態の断面図、第２図は
コンクリート打設工程を示す断面図、第３図はコンクリ
ート杭の部分断面図、第４図、第５図はそれぞれ有底筒
袋の外周に設けた突起の拡大断面図である。
１０・・・・・・杭穴、１１・・・・・・泥水、１２・
・・・・・有底筒袋、１３・・・・・・鉄筋、１４・・
・・・・現場打コンクリート、１５・・・・・・突起。The drawings show an embodiment of the present invention; Fig. 1 is a cross-sectional view of a bottomed cylinder bag and a reinforcing bar cage inserted into a pile hole, Fig. 2 is a cross-sectional view showing the concrete pouring process, and Fig. 3 1 is a partial sectional view of a concrete pile, and FIGS. 4 and 5 are enlarged sectional views of protrusions provided on the outer periphery of a bottomed cylindrical bag. 10...Pile hole, 11...Muddy water, 12.
...Bottomed tube bag, 13...Reinforced bar, 14...
...Cast-in-place concrete, 15...Protrusions.
Claims (3)
するとともに、該杭穴内にコンクリートを打設する現場
打コンクリート杭の造成方法において、前記杭穴内に不
透水性シート材をもって有底筒状に成形され、直径が前
述した杭穴内径より大きく成形した有底筒袋を挿入し、
該有底筒袋内に必要な補強鉄筋を収容してコンクリート
を打設し、前記有底筒袋を膨張させて杭穴内面に密着さ
せることを特徴としてなる現場打コンクリート杭の造成
方法。(1) In a method for constructing cast-in-place concrete piles, in which necessary reinforcing reinforcing bars are inserted into a pile hole excavated from the ground surface, and concrete is poured into the pile hole, a bottomed cylinder is placed with an impermeable sheet material in the pile hole. Insert a bottomed cylindrical bag shaped into a shape with a diameter larger than the inner diameter of the pile hole mentioned above,
A method for constructing a cast-in-place concrete pile, which comprises placing necessary reinforcing reinforcing bars in the bottomed cylindrical bag, pouring concrete, and expanding the bottomed cylindrical bag so as to bring it into close contact with the inner surface of the pile hole.
後、杭穴内に挿入する請求項第１項記載の現場打コンク
リート杭の造成方法。(2) The method for constructing cast-in-place concrete piles according to claim 1, wherein reinforcing reinforcing bars made of reinforcing bar baskets are placed in the bottomed tube bag and then inserted into the pile holes.
用する請求項第１項もしくは第２項記載の現場打コンク
リート杭の造成方法。(3) The method for constructing cast-in-place concrete piles according to claim 1 or 2, wherein a bottomed cylindrical bag having a plurality of protrusions that bite into the outer peripheral surface is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18755090A JPH0473320A (en) | 1990-07-16 | 1990-07-16 | Preparation of cast-in-place concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18755090A JPH0473320A (en) | 1990-07-16 | 1990-07-16 | Preparation of cast-in-place concrete pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0473320A true JPH0473320A (en) | 1992-03-09 |
Family
ID=16208044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18755090A Pending JPH0473320A (en) | 1990-07-16 | 1990-07-16 | Preparation of cast-in-place concrete pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0473320A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1016436C2 (en) * | 2000-10-18 | 2002-04-22 | Voorbij Groep Bv | Method for producing concrete pile in ground involves use of boring unit to create tubular opening in ground and after its withdrawal volume of opening is filled with concrete |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS491007A (en) * | 1972-04-19 | 1974-01-08 | ||
| JPS5378608A (en) * | 1976-12-22 | 1978-07-12 | Kajima Corp | Method of making underground concrete structure |
-
1990
- 1990-07-16 JP JP18755090A patent/JPH0473320A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS491007A (en) * | 1972-04-19 | 1974-01-08 | ||
| JPS5378608A (en) * | 1976-12-22 | 1978-07-12 | Kajima Corp | Method of making underground concrete structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1016436C2 (en) * | 2000-10-18 | 2002-04-22 | Voorbij Groep Bv | Method for producing concrete pile in ground involves use of boring unit to create tubular opening in ground and after its withdrawal volume of opening is filled with concrete |
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