JPS62211420A - Formation of pile - Google Patents
Formation of pileInfo
- Publication number
- JPS62211420A JPS62211420A JP5149186A JP5149186A JPS62211420A JP S62211420 A JPS62211420 A JP S62211420A JP 5149186 A JP5149186 A JP 5149186A JP 5149186 A JP5149186 A JP 5149186A JP S62211420 A JPS62211420 A JP S62211420A
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- water
- plastic film
- hydraulic slurry
- ground
- 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
- 230000015572 biosynthetic process Effects 0.000 title 1
- 239000002002 slurry Substances 0.000 claims abstract description 34
- 239000004744 fabric Substances 0.000 claims abstract description 32
- 239000002985 plastic film Substances 0.000 claims abstract description 24
- 229920006255 plastic film Polymers 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000010276 construction Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 24
- 238000002347 injection Methods 0.000 description 19
- 239000007924 injection Substances 0.000 description 19
- 239000004567 concrete Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 238000009412 basement excavation Methods 0.000 description 7
- 239000004568 cement Substances 0.000 description 7
- 230000018044 dehydration Effects 0.000 description 7
- 238000006297 dehydration reaction Methods 0.000 description 7
- 239000004570 mortar (masonry) Substances 0.000 description 7
- -1 polypropylene Polymers 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 239000002657 fibrous material Substances 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000012209 synthetic fiber Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は土木建築構造物の基礎を構築する際に用いられ
る杭の造成方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing piles used in constructing foundations for civil engineering and architectural structures.
（従来の技術と問題点）
従来、軟弱な地盤上に構造物を構築しようとする場合、
安全な基礎を得るためには以下の２通りの方法があった
。すなわち、第１には地盤改良による方法であり、セメ
ント等の硬化性材料を軟弱地盤中に混合して硬化させ、
地盤の支持力を高める方法など、第２には、杭を打設す
る方法であり、杭材としては現場打ちコンクリート杭と
既製杭（プレストレストコンクリート杭、鉄筋コンクリ
ート杭、鋼管杭等）が用いられており、それぞれ既往の
様々な工法により施工されている。(Conventional technology and problems) Conventionally, when trying to build a structure on soft ground,
There were two ways to obtain a safe foundation. That is, the first method is ground improvement, which involves mixing hardening materials such as cement into soft ground and hardening it.
The second method is to increase the bearing capacity of the ground.The second method is to drive piles, and the pile materials used are cast-in-place concrete piles and ready-made piles (prestressed concrete piles, reinforced concrete piles, steel pipe piles, etc.). Each of these is constructed using various existing construction methods.
従来の基礎構築方法において、地盤改良によるものでセ
メント等の硬化性材料を軟弱地盤中に混合する方法は、
天然材料の軟弱地盤自体を材料として用いるためにその
構成ｉＪ、含水比等が千差万別であり、硬化性材料を選
定するのに高度な技術的判断が必要であった。さらに軟
弱地盤を３次元的に広範囲にわたって一様に改良するこ
とは極めて困難であった。In the conventional foundation construction method, the method of mixing hardening materials such as cement into soft ground is based on ground improvement.
Because soft ground itself, which is a natural material, is used as a material, its composition iJ, water content, etc. vary widely, and a high level of technical judgment is required to select a hardenable material. Furthermore, it has been extremely difficult to uniformly improve soft ground over a wide area three-dimensionally.
また、最近では合成繊維製の円筒形布袋の中に石炭灰ス
ラリーを圧送することにより、軟弱地盤を改良する工法
（建設技術新聞；昭相６１年１月１６日発行）も開発さ
れたが、この工法は筒長と同程度以上の長い注入管を必
要とし、所定圧力を保持しながら底部より徐々にスラリ
ーの圧入を行ないつつ注入管を引き上げなければならず
、工程は繁雑であり、また、形成された硬化体も石炭灰
スラリーが主成分であるために、強度特性上は十分に良
質なものとは言えなかった。Recently, a method has also been developed to improve soft ground by pumping coal ash slurry into a cylindrical cloth bag made of synthetic fibers (Kensetsu Gijutsu Shimbun, published January 16, 1980). This method requires a long injection pipe that is at least as long as the cylinder length, and the slurry must be gradually injected from the bottom while maintaining a predetermined pressure while lifting the injection pipe, making the process complicated. Since the formed hardened body was mainly composed of coal ash slurry, it could not be said to be of sufficiently high quality in terms of strength characteristics.
さらに、ゴム袋等を用いることにより、コンクリートを
直接周辺地盤と接せずに打設する工法（特開昭５８−１
５６６２０号公報）も開発されたが、この工法も杭長と
同程度以上の鋼製注入管を必要とし、コンクリートの打
設時には打設しながら注入管を引き上げなければならず
、やはり工程が繁雑で実用性に欠けるものであった。Furthermore, by using rubber bags etc., a method of pouring concrete without directly contacting the surrounding ground (Japanese Unexamined Patent Publication No. 58-1
56620) was also developed, but this method also required a steel injection pipe with a length equal to or longer than the pile length, and when pouring concrete, the injection pipe had to be pulled up while pouring, making the process complicated. It lacked practicality.
いずれにしても、現場打ちのコンクリート杭はコンクリ
ート打設後約１ケ月程度の養生期間を要し、工期の面で
の経済性において劣るものであった。In any case, cast-in-place concrete piles require a curing period of approximately one month after concrete placement, and are inferior in economic efficiency in terms of construction period.
次に、杭を打設する方法のうち、現場打ちコンクリート
杭はパケット、ドリルビット埠の機械力により地盤中に
孔を設け、ベントナイト液等の孔壁安定液によって孔壁
の崩壊を防ぎつつ鉄筋を立て込み、コンクリートを打設
することによって造成されるが、孔底く溜まるスライム
の処理や泥水の管理に困難な点が多（、コンクリートが
直接地盤に接して打設させるために杭の性能の基本とな
るべきコンクリートの品質に問題があった。また、既製
杭の場合は、一般に杭本体及び施工機械が大型なものが
多（都市部の狭樟地等では場所的な制限のために施工不
可能となる場合が少なくなかった。また、騒音、振動等
の公害問題のために支持力が大きい打撃工法が採用でき
なくなってきたため、打撃工法に比較すると支持力の低
い無公害工法によらざるを得す、経済性が低゛下すると
いう問題があった。Next, among the methods of driving piles, cast-in-place concrete piles use the mechanical force of packets and drill bits to create holes in the ground, and use a hole wall stabilizing liquid such as bentonite to prevent collapse of the hole walls while reinforcing the concrete piles. Piles are created by pouring concrete into the ground and pouring concrete, but there are many difficulties in dealing with slime that collects at the bottom of the hole and managing muddy water. There was a problem with the quality of concrete, which should be the basis of construction.Also, in the case of prefabricated piles, the pile bodies and construction machines are generally large (in narrow urban areas, etc., due to space restrictions) In addition, due to pollution problems such as noise and vibration, it has become impossible to adopt the percussion method, which has a large bearing capacity, so it has become difficult to use the non-pollution construction method, which has a low bearing capacity compared to the percussion method. Unavoidably, there was a problem that the economic efficiency decreased.
（問題点を解決するための手段）
本発明は、前記従来技術の欠点を解消すべくなされたも
のであり、その目的は可撓性筒状体を用いることにより
簡便かつ確実に高品質の杭を造成することにある。(Means for Solving the Problems) The present invention has been made to solve the drawbacks of the prior art, and its purpose is to easily and reliably produce high-quality piles by using a flexible cylindrical body. The purpose is to create.
即ち、本発明は、外側は透水性の強力布帛（例えば引張
強度として約５０〜３００ｋｇｆ／ｃｒｒＬ程度を有す
る布帛）、内側は不透水性のプラスチックフィルム（例
えば張力が生ずると容易に破損し得る５−２００μｍ程
度の厚みを有するプラスチックフィルム）から成る透水
性の強力布帛の片端部の閉塞した２重構造の可撓性筒状
体を、地盤中の所定深度まで挿入した後、該筒状体の上
部開放端より水硬性スラリーを圧入することによって筒
状体を拡大膨張させつつ、最終的に内側のプラスチック
フィルムを破損させることにより、外側の透水性の強力
布帛を通して水硬性スラリーの余剰水の脱水を図り円柱
状硬化体を作成することを特徴とする杭の造成法である
。That is, the present invention uses a water-permeable strong fabric (for example, a fabric having a tensile strength of about 50 to 300 kgf/crrL) on the outside, and a water-impermeable plastic film (for example, 5, which can be easily damaged when tension is generated) on the inside. - After inserting a flexible cylindrical body with a double structure made of water-permeable strong fabric (plastic film with a thickness of about 200 μm) with one end closed, into the ground to a predetermined depth, the cylindrical body By press-fitting the hydraulic slurry from the upper open end, the cylindrical body is expanded and expanded, and the inner plastic film is finally broken, allowing excess water from the hydraulic slurry to be removed through the outer water-permeable strong fabric. This method of building piles is characterized by creating a cylindrical hardened body.
本発明では２重構造を有する可撓性筒状体を用いるが、
外側の通水性の強力布帛とは、通常使用される一般的な
繊維材料より成るものである。In the present invention, a flexible cylindrical body having a double structure is used,
The outer water permeable strong fabric is made of commonly used fibrous materials.
素材としては天然繊維（例えば綿、麻など）、合成繊維
（例えば、ナイロン、ポリエステル、ポリプロピレン、
ポリエチレンなど）及びその他の繊維であり、布帛面に
垂直な方向での透水係数が１０〜Ｉ Ｏｃｍ／ｓｅｃ以
上の値を有し、耐水圧性はほぼ零に等しいもので水硬性
スラリーからの脱水を妨げることがな（、さらに、水硬
性スラリーの高圧注入時の最大圧力（５〜１５ ｋｇｆ
Δ程度）に耐え得ることの可能な引張強度５０〜３００
ｋｇｆ／の程度を有する布帛である。一方、内側の不
透水性のプラスチックフィルムとは、通常のグラスチッ
ク原料であるポリプロピレン、ポリエステル。Materials include natural fibers (e.g. cotton, linen, etc.), synthetic fibers (e.g. nylon, polyester, polypropylene,
polyethylene, etc.) and other fibers, and have a water permeability coefficient of 10 to I Ocm/sec or more in the direction perpendicular to the fabric surface, and have a water pressure resistance of almost zero, making it difficult to remove water from hydraulic slurry. (in addition, the maximum pressure during high-pressure injection of hydraulic slurry (5 to 15 kgf)
Tensile strength 50 to 300 that can withstand
The fabric has a weight of kgf/. On the other hand, the inner water-impermeable plastic film is made of polypropylene and polyester, which are common glass raw materials.
ポリエチレン、ポリスチレン等を素材とする厚さ５〜２
００μｍ程度の延伸、または未延伸フィルムであり、筒
状のプラスチックフィルムの長さ方向及び円周方向の内
、少な（とも円周方向においては、張力が作用すること
により容易に伸びが生じ、なおかつ、生じた伸びが一定
限界を越えると容易に破損し得るものである。Thickness 5-2 made of polyethylene, polystyrene, etc.
It is a stretched or unstretched film of about 00 μm, and it is a cylindrical plastic film with a small amount of elongation in the length direction and circumferential direction (in both the circumferential direction, it is easily elongated by the action of tension, and If the elongation that occurs exceeds a certain limit, it can easily break.
通常使用される繊維材料より成る布帛は、作用する張力
に応じた伸びが生じる。すなわち、本発明でいう可撓性
筒状体内部に水硬性スラリーを圧入する際に発生する内
部圧力の作用によって、外側の布帛筒状体の外周長は内
部圧力（張力）Ｐ＝０時の外周長ＬＯから最終圧力時の
外周長Ｌｅまで伸びる。同様に内側のプラスチックフィ
ルムの外周長もｌＯから−ｅｅまで伸びるが限界伸度（
破断伸度）以上にまで伸びることはできない。Fabrics made of commonly used fiber materials elongate in response to the applied tension. In other words, due to the effect of the internal pressure generated when hydraulic slurry is press-fitted into the flexible cylindrical body of the present invention, the outer circumference of the outer fabric cylindrical body becomes the same as when the internal pressure (tension) P=0. It extends from the outer circumferential length LO to the outer circumferential length Le at the time of final pressure. Similarly, the outer circumference of the inner plastic film also extends from lO to -ee, but the limit elongation (
It cannot be elongated beyond the elongation (elongation at break).
本発明では、内側のプラスチックフィル４の破断限界周
長−ｅｅをＬＯ≦１３ｅ＜Ｌｅ として設計したもの
を用いることにより、本発明でいう２重構造の可撓性筒
状体に水硬性スラリーを圧入する場合に、内側の不透水
性プラスチックフィルムが水硬性スラリーの脱水を抑制
し、筒状体の内部はほぼ均一な圧力分布状態となり先端
部まで一様な円柱体を作成することができる。さらに圧
入の最終過程では高い内部圧力により内側のプラスチッ
クフィルムが伸びの限界状態に達して破損し、外側の透
水性の強力布帛を通して水硬性スラリーからの速やかな
脱水が行なわれる。その結果成形される円柱状硬化体は
、脱水化のために高品質、高強度なものとなる。In the present invention, hydraulic slurry is applied to the double-structured flexible cylindrical body as referred to in the present invention by using the inner plastic fill 4 designed so that the breaking limit circumference -ee is LO≦13e<Le. When press-fitting, the inner water-impermeable plastic film suppresses dehydration of the hydraulic slurry, and the inside of the cylindrical body has a nearly uniform pressure distribution, making it possible to create a cylindrical body that is uniform all the way to the tip. Furthermore, during the final process of press-fitting, the inner plastic film reaches its limit of elongation and breaks due to the high internal pressure, and water is quickly removed from the hydraulic slurry through the outer water-permeable strong fabric. The cylindrical cured body formed as a result has high quality and high strength due to dehydration.
なお、圧入の最終過程において筒状体内部が高い圧力状
態になるが、外側の強力布帛は充分な強度を有するので
布帛の破損は生じることがない。Although the inside of the cylindrical body becomes under high pressure in the final process of press-fitting, the strong fabric on the outside has sufficient strength so that the fabric will not be damaged.
すなわち、本発明でいう２重構造の可撓性筒状体の外側
の布帛は、水硬性スラリーの高圧注入時の内部圧力に耐
え得るような充分な引張強度を有する透水性のものであ
り、内側の不透水性のプラスチックフィルムは、筒状体
の拡大膨張時には水硬性スラリーからの脱水を抑制し最
終的には破損し得るものであれば前記の材料に何ら限定
されるものではない。That is, the outer fabric of the double-structured flexible cylindrical body as used in the present invention is water-permeable and has sufficient tensile strength to withstand the internal pressure during high-pressure injection of hydraulic slurry, The inner water-impermeable plastic film is not limited to the above materials as long as it can suppress dehydration from the hydraulic slurry and eventually break when the cylindrical body expands.
通常使用される繊維素材より成る１重の布ＰＪｆｉｌＩ
状体に水硬性スラリーを圧入する場合には、布帛を通し
て水硬性スラリーの脱水が速やかに進行し筒状体の内部
特に先端部への圧力伝達が不充分となり、先端部まで一
様な所定径の円柱状硬化体を成形することができない。A single layer of cloth made of commonly used fiber materials PJfilI
When hydraulic slurry is press-fitted into a cylindrical body, dehydration of the hydraulic slurry proceeds rapidly through the fabric, resulting in insufficient pressure transmission to the inside of the cylindrical body, especially to the tip. It is not possible to form a cylindrical cured body.
そこで過剰な圧力により無理な圧入を図ると布帛の破損
等の問題を生じることになる。Therefore, if an attempt is made to forcefully press in with excessive pressure, problems such as damage to the fabric will occur.
また、外側が透水性の強力布帛、内側が不透水性のプラ
スチックフィルムの２重構造の可撓性筒状体を用いる場
合でも、最終的に内側のプラスチックフィルムの破損が
生じないものであると、注入された水硬性スラリーが脱
水されず、高品質、高強度の硬化体が得られないために
好ましくない。In addition, even when using a flexible cylindrical body with a double structure of a water-permeable strong fabric on the outside and a water-impermeable plastic film on the inside, the inner plastic film must not be damaged in the end. This is not preferable because the injected hydraulic slurry is not dehydrated and a cured product of high quality and high strength cannot be obtained.
なお、本発明でいう２重構造の可撓性筒状体は先端部が
閉塞しているが、内側の不透水性のプラスチックフィル
ムは先端部が閉基していすにそのため先端部からの脱水
が速やかに進行したとしてもその影響は筒状体先端部に
限定されるので、本発明の主旨圧はほとんど関与しない
。すなわち、内側のプラスチックフィルムの先端部の閉
塞については限定するものではない。Note that the flexible cylindrical body with a double structure according to the present invention has a closed tip, but the inner water-impermeable plastic film has a closed tip, which prevents dehydration from the tip. Even if this progresses rapidly, its influence is limited to the tip of the cylindrical body, so that the main thrust of the present invention is hardly involved. That is, there is no limitation on the occlusion of the leading end of the inner plastic film.
本発明で使用する可撓性筒状体の外径は１０〜４０ｃｒ
ｌＬ程度であり、可撓性筒状体を地盤中に挿入する方法
は予め所定径以下の掘削孔を設け、この中に可撓性筒状
体を挿入すれば良いが、地盤が軟弱な場合は筒状体の先
端部をシャフトの先でつかみ直接地盤中に押し込むこと
も可能である。予め掘削孔を設けて可撓性筒状体を挿入
する場合の掘削孔の径は可撓性筒状体が容易に入る径で
あれば充分であり、通常は筒状体外径の半分程度あれば
良い。The outer diameter of the flexible cylindrical body used in the present invention is 10 to 40 cr.
1L, and the method for inserting the flexible cylindrical body into the ground is to prepare an excavation hole with a predetermined diameter or less in advance and insert the flexible cylindrical body into this, but if the ground is soft. It is also possible to grasp the tip of the cylindrical body with the tip of the shaft and push it directly into the ground. When inserting a flexible cylindrical body into an excavated hole by preparing an excavation hole in advance, the diameter of the excavated hole is sufficient as long as the flexible cylindrical body can easily fit therein, and usually about half the outer diameter of the cylindrical body is sufficient. Good.
また、地表より可撓性筒状体に注入する水硬性スラリー
はポンプ圧入を図れるものであれば、セメント系１石膏
系１石灰系、ポゾラン系、スラグ系及びその他の材料等
を単独あるいは組合わせて使用することが可能であるが
、経済性、流動性。In addition, the hydraulic slurry to be injected into the flexible cylindrical body from the ground surface may be one of cement, one gypsum, one lime, pozzolan, slag, and other materials, either singly or in combination, as long as it can be injected with a pump. Although it is possible to use it for various reasons, it is not economical or fluid.
強度特性等の面から、セメント系のモルタル、コンクリ
ートが望ましい。From the viewpoint of strength characteristics, cement-based mortar and concrete are preferable.
布帛筒状体内部への水硬性スラリーの注入方法は、筒状
体の上部開放端からのポンプ圧入による方法が最も簡便
かつ迅速で経済的である。The method of injecting the hydraulic slurry into the inside of the fabric cylindrical body is the simplest, quickest, and most economical method by press-fitting it with a pump from the upper open end of the cylindrical body.
（発明の効果） 本発明は、以下のような利点を有する。(Effect of the invention) The present invention has the following advantages.
■、水硬性スラリーの注入圧力によって膨張し得る可撓
性筒状体を用いることにより、比較的軟弱な粘性土ある
いは砂質土地盤における筒状体挿入のだめの掘削孔は筒
状体外径の半分程度以下で済み、小型の施工機械で施工
することが可能であり経済的である。■By using a flexible cylindrical body that can be expanded by the injection pressure of hydraulic slurry, the drilling hole for inserting the cylindrical body in relatively soft cohesive soil or sandy soil is half the outer diameter of the cylindrical body. It is economical as it can be done with a small construction machine.
■、２１構造を有する可撓性筒状体を用いており、筒状
体の拡大膨張時には内側の不透水性のプラスチックフィ
ルムが水硬性スラリーの脱水を抑制し筒状体の内部は先
端部まで圧力が伝達されることにより、筒状体が途中で
閉塞することなく全長にわたって一様に拡大膨張し、そ
の後プラスチックフィルムを破損させつつ水硬性スラリ
ーを高い圧力で注入し、外側の透水性の強力布帛を通し
てスラリーからの著しい脱水を図ることができる。■A flexible cylindrical body with a 21 structure is used, and when the cylindrical body expands, the water-impermeable plastic film inside suppresses dehydration of the hydraulic slurry, and the interior of the cylindrical body extends all the way to the tip. By transmitting pressure, the cylindrical body expands and expands uniformly over its entire length without clogging in the middle, and then hydraulic slurry is injected at high pressure while breaking the plastic film, creating a strong water-permeable outer layer. Significant dewatering from the slurry can be achieved through the fabric.
０、可撓性筒状体の内部に水硬性スラリーを充填するた
めに水硬性スラリーが直接地盤に接することがなく良質
の硬化体が得られる。0. Since the inside of the flexible cylindrical body is filled with hydraulic slurry, the hydraulic slurry does not come into direct contact with the ground, and a high-quality hardened body can be obtained.
■、最終的には高圧注入により充填された水硬性スラリ
ーの脱水化はかなり進行しており、得られる円柱状硬化
体は極めて高品質、高強度のものであり、さらにセメン
ト等を混合する地盤改良や現場打ちコンクリート杭に比
較して養生期間も短縮される。■Finally, the dehydration of the hydraulic slurry filled by high-pressure injection has progressed considerably, and the resulting cylindrical hardened body is of extremely high quality and strength, and it is also suitable for mixing cement, etc. The curing period is also shortened compared to retrofitted or cast-in-place concrete piles.
■、水硬性スラリーは地表部の筒状体の上部開放端から
ポンプ圧入することによって行なわれるために施工は簡
便かつ迅速であり経済的である。(2) Since the hydraulic slurry is pumped into the cylindrical body from the open end of the upper part of the cylindrical body on the ground surface, the construction is simple, quick, and economical.
■、施工に際しては騒音、振動の発生がなく、また排泥
、排水等の処理の必要もなく無公害で施工することが可
能である。■During construction, there is no noise or vibration, and there is no need for treatment of mud removal, drainage, etc., and the construction can be carried out without pollution.
以上の通りで、この方法によると安価で信頼性の高い円
柱状硬化体が無公害で確実、容易に得られる。As described above, according to this method, an inexpensive and highly reliable cylindrical cured body can be obtained reliably and easily without any pollution.
（実施例） 以下、実施例により本発明を説明する。(Example) The present invention will be explained below with reference to Examples.
実施例及び比較例
内径ＳＯＷ、長さ５０００Ｂの掘削孔を地盤中に設け、
この掘削孔内に所定外径１５０Ｂ、長さ５３００朋の外
側は透水性の強力布帛、内側は不透水性のプラスチック
フィルムからなる先端部の閉塞した２重構造の可撓性筒
状体を長さｓ ｏ ｏ ｏ、の鋼棒を用いて挿入した後
、筒状体の上部開放端にモルタル注入ポンプに連結され
た注入ホースを結び付け、ポンプにより筒状体内部にモ
ルタルを注入した。Example and Comparative Example An excavation hole with an inner diameter of SOW and a length of 5000B was established in the ground.
Inside this excavation hole, a flexible cylindrical body with a double structure with a closed end and a strong water-permeable fabric on the outside and a water-impermeable plastic film on the inside, with a predetermined outer diameter of 150 B and a length of 5,300 mm, was installed. After inserting it using a steel rod of 1.5 mm, an injection hose connected to a mortar injection pump was tied to the upper open end of the cylindrical body, and mortar was injected into the cylindrical body by the pump.
注入に際し筒状体の内部の圧力分布状態を測定するため
に、筒状体の挿入に使用した鋼棒には計５個の圧力セン
サーを設置した。圧力センサーは地表部より５００ 、
１５００ 、２５００ 、３５００．４５００鵡の位置
となる筒状体の中心軸付近に配置した。さら忙、水硬性
スラリーのポンプによる注入元圧力を測定するために注
入ホースの途中にも圧力センサーを１個配置した。In order to measure the pressure distribution inside the cylindrical body during injection, a total of five pressure sensors were installed on the steel rod used to insert the cylindrical body. The pressure sensor is 500m from the ground surface.
They were placed near the central axis of the cylindrical body at positions 1500, 2500, 3500, and 4500. Furthermore, a pressure sensor was placed in the middle of the injection hose to measure the pressure at the injection source of the hydraulic slurry pump.
注入開始後、筒状体内部にモルタルが満たされるまでは
注入元圧力はほとんど上昇しなかったが、満たされて後
筒状体が拡大膨張し径が大きくなる忙従ってポンプの注
入元圧力は上昇し始め、この圧力が１ｏ１ｃｇｆ／ｃＩ
Ｉ？になった時点でポンプを止め注入を終了した。After injection started, the injection source pressure hardly increased until the inside of the cylindrical body was filled with mortar, but after it was filled, the cylindrical body expanded and expanded, increasing its diameter, so the injection source pressure of the pump increased. and this pressure is 1o1cgf/cI
I? At this point, the pump was stopped and the infusion was completed.
ポンプ停止時における筒状体内部の圧力分布状態を第１
図−の実線で示す。The pressure distribution state inside the cylindrical body when the pump is stopped is
It is shown by the solid line in the figure.
比較のために前記の２重構造を有する可撓性筒状体のう
ち内側のプラスチックフィルムを除いた外側の布帛のみ
による１重構造の布帛筒状体を用いて同様な方法により
圧力分布状態を測定した。For comparison, the pressure distribution state was determined by the same method using a single-layered fabric tube made of only the outer fabric, excluding the inner plastic film of the flexible cylindrical body with the above-mentioned double-layered structure. It was measured.
その結果を第１図の破線で示す。The results are shown by the broken line in FIG.
後日掘削調査した結果、２ｍ構造の筒状体を用いたもの
はほぼ完全な円柱状硬化体が形成されており、その外径
は全長にわたって約１６８」であった。また、内側のプ
ラスチックフィルムは、はぼ全長にわたって長さ方向に
破損していた。As a result of an excavation investigation later, it was found that an almost perfect cylindrical hardened body had been formed using a 2m-long cylindrical body, and its outer diameter was approximately 168" over the entire length. In addition, the inner plastic film was longitudinally damaged along the entire length.
一方、１重構造の布帛筒状体を用いたものは、上端部は
外径約１６５ｊ１１まで拡大膨張していたが、これ以深
では徐々に外径が小さくなっており、特に地表より約２
０００Ｒ，以上深部ではほぼ掘削孔径と同程度の約８０
１１１の外怪圧なっていた。On the other hand, for the one using a single-layer fabric cylinder, the upper end expanded and expanded to an outer diameter of about 165j11, but the outer diameter gradually became smaller at deeper depths, especially at about 2
At depths deeper than 000R, the diameter of the borehole is about 80
The outside pressure was 111.
これら２本の掘削した硬化体の外観図を第２図に示す。Figure 2 shows an external view of these two excavated hardened bodies.
本実施例で注入したモルタルはセメント／砂のｉｔ比が
０．５、水／セメントの重量比が０１６０通常使用され
るモルタルである。また、使用した筒状体材料は外側が
引張強度約２００ ｋｇｆ／ｃＩｒＬのナイロン製織布
であり、内側は厚さ３０μｍの延伸したポリエチレンフ
ィルムである。なお、外側のナイロン製織布及びポリエ
チレンフィルムの初期無張力状態での外周長はそれぞれ
約４７０ｍ、約４９０朋であった。The mortar injected in this example is a commonly used mortar with a cement/sand IT ratio of 0.5 and a water/cement weight ratio of 0160. The material used for the cylindrical body was a woven nylon fabric with a tensile strength of about 200 kgf/cIrL on the outside, and a stretched polyethylene film with a thickness of 30 μm on the inside. The outer circumferential lengths of the outer nylon woven fabric and the polyethylene film in the initial non-tensioned state were about 470 m and about 490 m, respectively.
【図面の簡単な説明】
第１図は実施例で述べた２重構造及び１重構造の可撓性
筒状体を用いて行なったモルタル注入施工におけるポン
プ停止時の圧力分布状態を示す。
第２図は実施例で述べた２重構造及び１重構造の可撓性
筒状体を用いて成形した２本の硬化体の外観の略図であ
る。
第３〜５図は本発明の各工程を示し、第３図は２重構造
を有する布帛筒状体１を地盤中に挿入した状態を示す。
この場合の地盤中への筒状体１の挿入方法は予め掘削さ
れた小径の掘削孔４を利用しており、第４図は布帛筒状
体ｌの地表部の開放端５より水硬性スラリー６を注入ホ
ース７を用いて注入している状態を示し、第５図は地盤
中で拡大膨張し、脱水、固化して完成した円柱状硬化体
を示す。
１・・・２Ｍ構造の可撓性筒状体、
２・・・不透水性のプラスチックフィルム、３・・・透
水性の強力布帛、
４・・・掘削孔、
５・・・可撓性筒状体の上部開放端、
６・・・水硬性スラリー、
７・・・注入ホース、
８・・・水硬性スラリーの硬化体、
９・・・プラスチックフィルムの破損部、特許出願人
旭化成工業株式会社
第１図
第２図BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the pressure distribution state when the pump is stopped in mortar injection work performed using the flexible cylindrical bodies of double structure and single structure described in the examples. FIG. 2 is a schematic diagram of the appearance of two cured bodies molded using the flexible cylindrical bodies having a double structure and a single structure described in the examples. 3 to 5 show each step of the present invention, and FIG. 3 shows a state in which the fabric cylindrical body 1 having a double structure is inserted into the ground. In this case, the method of inserting the cylindrical body 1 into the ground utilizes a small-diameter excavation hole 4 that has been excavated in advance. 6 is injected using the injection hose 7, and FIG. 5 shows a cylindrical hardened body that has been expanded and expanded in the ground, dehydrated, and solidified. 1... Flexible cylindrical body with 2M structure, 2... Water impermeable plastic film, 3... Water permeable strong fabric, 4... Excavation hole, 5... Flexible tube upper open end of shaped body, 6... hydraulic slurry, 7... injection hose, 8... hardened body of hydraulic slurry, 9... damaged part of plastic film, patent applicant
Asahi Kasei Corporation Figure 1 Figure 2
Claims (1)
水性のプラスチックフィルムから成る２重構造の可撓性
筒状体を、地盤中の所定深度まで挿入した後、該筒状体
の上部開放端より水硬性スラリーを圧入することによっ
て筒状体を拡大膨張させつつ、最終的に内側のプラスチ
ックフィルムを破損させることにより、外側の透水性の
強力布帛を通して水硬性スラリーの余剰水の脱水を図り
円柱状硬化体を作成することを特徴とする杭の造成法A flexible cylindrical body with a double structure consisting of a water-permeable strong fabric with one end closed on the outside and a water-impermeable plastic film on the inside is inserted into the ground to a predetermined depth, and then the cylindrical body is By press-fitting the hydraulic slurry from the upper open end, the cylindrical body is expanded and expanded, and the inner plastic film is finally broken, allowing excess water from the hydraulic slurry to be removed through the outer water-permeable strong fabric. A pile construction method characterized by creating a cylindrical hardened body by aiming at
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5149186A JPS62211420A (en) | 1986-03-11 | 1986-03-11 | Formation of pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5149186A JPS62211420A (en) | 1986-03-11 | 1986-03-11 | Formation of pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62211420A true JPS62211420A (en) | 1987-09-17 |
Family
ID=12888438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5149186A Pending JPS62211420A (en) | 1986-03-11 | 1986-03-11 | Formation of pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62211420A (en) |
-
1986
- 1986-03-11 JP JP5149186A patent/JPS62211420A/en active Pending
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