JPH0833009B2 - Construction method for ready-made piles with bags - Google Patents
Construction method for ready-made piles with bagsInfo
- Publication number
- JPH0833009B2 JPH0833009B2 JP62174372A JP17437287A JPH0833009B2 JP H0833009 B2 JPH0833009 B2 JP H0833009B2 JP 62174372 A JP62174372 A JP 62174372A JP 17437287 A JP17437287 A JP 17437287A JP H0833009 B2 JPH0833009 B2 JP H0833009B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- bag
- ready
- expand
- bag body
- 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 - Lifetime
Links
- 238000010276 construction Methods 0.000 title 1
- 239000004568 cement Substances 0.000 claims description 14
- 239000008267 milk Substances 0.000 claims description 14
- 210000004080 milk Anatomy 0.000 claims description 14
- 235000013336 milk Nutrition 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、セメントミルクやコンクリート等を注入し
て膨張拡大する袋体を有する既製杭の施工方法に関する
ものである。TECHNICAL FIELD The present invention relates to a method for constructing a prefabricated pile having a bag body that is inflated and expanded by injecting cement milk, concrete or the like.
既製杭に袋体を取り付け、その杭を沈設した後、袋体
内に固結性流動物を注入し、袋体を膨張拡大させること
により、大きな支持力が発現されることが特公昭62−10
325号公報や特公昭62−63721号公報に記載されている。After attaching the bag to the ready-made pile and sunk the pile, injecting the solidifying fluid into the bag to expand and expand the bag, a large supporting force is developed.
No. 325 and Japanese Patent Publication No. 62-63721.
従来の方法は、ジェット等によるプロボーリング工法
によって拡大掘削し、拡大掘削した部分に袋体を有する
既製杭を圧入して可能な位置までできるだけ深く沈設
し、しかる後に袋体内に固結性流動物を注入して膨張拡
大させていた。The conventional method is to expand and dig by a pro-boring method using a jet, etc., press-fit a prefabricated pile with a bag into the expanded and excavated portion, and sunk it as deep as possible to the point where it is possible to set the solidified fluid in the bag. Was injected to expand and expand.
しかし、従来の方法では拡大掘削した地盤の底面近辺
にスライム（掘削孔を形成した際にその底面に生成する
固形粒または塊を含む泥状物）が存在し、かつそのスラ
イムの真上に杭が載った場合、荷重作用時に杭の初期沈
下量が大きくなるという問題があった。However, in the conventional method, there is a slime (a mud containing solid particles or agglomerates generated at the bottom of the drilling hole when it is formed) near the bottom of the enlarged ground, and the pile is directly above the slime. There was a problem that the initial subsidence amount of the pile increased when the load was applied.
本発明は、上述のような従来技術における問題点の解
決を図ったものであり、袋体を有する杭を拡大掘削孔内
に沈設した際の大きな初期沈下の発生を防止することを
目的とするものである。The present invention is intended to solve the above-mentioned problems in the conventional technology, and an object thereof is to prevent the occurrence of a large initial subsidence when a pile having a bag body is sunk in an enlarged excavation hole. It is a thing.
本発明の袋体を有する既製杭の施工方法は、セメント
ミルクと原地盤を混合した支持層中に、杭下端部から上
方における外周部のみを取り囲むように取り付けられた
袋体を有する既製杭を、その先端部が掘削底面から上方
に杭外径の0.5〜２倍の位置に位置するよう沈設し、し
かる後に袋体内に固結性流動体を注入して膨張拡大させ
ることを特徴とするものである。The method for constructing a prefabricated pile having a bag body of the present invention is a prefabricated pile having a bag body attached so as to surround only the outer peripheral portion above the lower end of the pile in the support layer in which cement milk and the ground are mixed. , Characterized in that its tip is sunk upward from the bottom of the excavation so as to be located at a position 0.5 to 2 times the outer diameter of the pile, and then a solidifying fluid is injected into the bag body to expand and expand. Is.
既製杭に取り付ける袋体は、脱水性と強度の点からナ
イロン、ポリエステル、ポリエチレン、ビニロンなどの
合成繊維のものが好ましい。The bag attached to the ready-made pile is preferably made of synthetic fiber such as nylon, polyester, polyethylene, or vinylon from the viewpoint of dehydration property and strength.
袋体を取り付けた杭は、プレボーリング工法により拡
大掘削され、セメントミルクを充填した支持層中に沈設
する。拡大掘削は、ジェット噴射による方法か、拡大翼
を有するビットによる掘削方法などで行い、この拡大掘
削部にセメントミルクを注入し、原地盤の掘削物と撹拌
混合する。The pile with the bag attached will be enlarged and excavated by the pre-boring method and will be sunk in the support layer filled with cement milk. The expanded excavation is performed by a jet injection method or a drilling method using a bit having an expanded blade. Cement milk is injected into this expanded excavated portion and mixed with the excavated material of the ground.
この発明では、このようにセメントミルクと原地盤と
を混合した支持層中に袋体を有する既製杭の下端を位置
させる。そのとき、既製杭の下端はスライムではなく、
その上に形成される良質なセメントミルク層となる位置
に位置するよう沈設する。その際の杭先端（下端）の位
置は、拡大掘削した地盤の底面から上方0.5D〜2D（Ｄは
杭径）の範囲である。In the present invention, the lower end of the ready-made pile having the bag body is positioned in the support layer thus mixed with the cement milk and the ground. At that time, the bottom of the ready-made pile is not slime,
It is sunk so that it will be located in a position that will form a high quality cement milk layer formed on it. The position of the pile tip (bottom end) at that time is in the range of 0.5D to 2D (D is the pile diameter) above the bottom of the ground that has been expanded and excavated.
0.5D以下にすると、一般にスライム形成層に接するこ
とになり、2D以上としてもあまり効果に変化はなく、掘
削量やセメントミルクの注入量の増大につながる。If it is 0.5D or less, it generally comes into contact with the slime forming layer, and even if it is 2D or more, the effect does not change so much and the amount of excavation and the amount of cement milk injected are increased.
一般に袋体内に固結性流動体を注入して膨張させる
と、袋体は上方から順次膨張して行き、最後に下部付近
が膨張して完了する。上記のように杭下端を流動性の良
いセメントミルク混合層に位置させて袋体を膨張させる
と、袋体は完全に膨張することができ、目的とする十分
な大きさの拡大球根が形成される。そのため、初期沈下
量がほとんどなく杭支持力も十分に得られる。In general, when the caking fluid is injected into the bag and inflated, the bag is inflated sequentially from the upper part, and finally the lower part is inflated and completed. When the lower end of the pile is located in the cement milk mixing layer with good fluidity as described above and the bag body is inflated, the bag body can be completely inflated, and an enlarged bulb of a desired size is formed. It Therefore, there is almost no initial settlement and sufficient pile bearing capacity is obtained.
これに対して、杭下端をスライムに接して位置させる
と、袋の下部は十分に膨張できず、不十分な拡大球根に
なる。そのため、初期沈下量が大きくなり、杭支持力も
落ちる。On the other hand, when the lower end of the pile is located in contact with the slime, the lower part of the bag cannot be expanded sufficiently, resulting in an insufficient expanded bulb. Therefore, the amount of initial settlement is large and the pile bearing capacity is also reduced.
以下、本発明の実施例について説明する。 Examples of the present invention will be described below.
第３図に示すように、外径600mmのナイロン糸製袋体1
0をエポキシ系接着剤とバンド９により、外径350mmのコ
ンクリート杭に装着した。As shown in FIG. 3, a nylon thread bag body 1 with an outer diameter of 600 mm
No. 0 was attached to a concrete pile having an outer diameter of 350 mm by an epoxy adhesive and band 9.
この杭をジェットにより拡大掘削した後、拡大掘削内
にセメントミルクを充填し、撹拌混合した支持層中に沈
設した。しかる後に、杭中空部に設けた注入管６を通し
て固結性流動物であるセメントミルクを注入し、袋体を
膨張拡大させた。After this pile was expanded and excavated by a jet, cement milk was filled in the expanded excavation, and the pile was sunk in the support layer with stirring and mixing. Then, cement milk, which is a solidifying fluid, was injected through the injection pipe 6 provided in the hollow portion of the pile to expand and expand the bag.
なお、試験体は、第１図に示すように拡大掘削底面よ
り30cm上方で止めたもの（No.1）と、第２図に示すよう
に拡大掘削面より7cm上方で止めたもの（No.2）の２種
類を施工し、載荷試験を実施した。杭の表面には周面摩
擦力を小さくするためにスリップレイヤー４を処した。The test specimens were stopped 30 cm above the enlarged excavation bottom surface as shown in Fig. 1 (No. 1) and those stopped 7 cm above the enlarged excavation surface as shown in Fig. 2 (No. Two types of 2) were constructed and a loading test was conducted. A slip layer 4 was applied to the surface of the pile to reduce the frictional force on the peripheral surface.
その結果、載荷荷重50トンで、No.1が沈下量4mmであ
るのに対し、No.2では10mmと両者に大きな差が生じた。
また、拡大掘削部にセメントミルクを注入混合しないで
30cm上方で止めたもの（No.3）は10mm以上沈下した。As a result, with a loading load of 50 tons, No. 1 had a settlement of 4 mm, while No. 2 had a large settlement of 10 mm.
Also, do not inject and mix cement milk into the expanded drilling section.
The one stopped at 30 cm above (No. 3) sinked more than 10 mm.
本発明により、拡大掘削底面にスライムが存在した場
合でも、杭を良質なセメントミルク層上で止めることに
より、初期沈下量がほとんどなくなる。According to the present invention, even when slime is present on the enlarged excavated bottom surface, by stopping the pile on the high quality cement milk layer, the initial subsidence amount becomes almost zero.
第１図は本発明により施工した杭の正面図、第２図は従
来の方法により施工した杭の正面図、第３図は本発明に
使用する杭の正面図、第４図は本発明に使用する杭の断
面の一部を示す図である。 １……袋体を有するコンクリート杭、２……良質なセメ
ントミルク層、３……スライム、４……スリップレイヤ
ーを処したコンクリート杭、５……継手、６……注入
管、７……端板、８……ゴム帯、９……バンド、10……
袋体、11……コンクリート、12……鉄筋またはPC鋼棒FIG. 1 is a front view of a pile constructed according to the present invention, FIG. 2 is a front view of a pile constructed by a conventional method, FIG. 3 is a front view of a pile used in the present invention, and FIG. It is a figure which shows a part of cross section of the pile used. 1 ... Concrete pile with bag, 2 ... High quality cement milk layer, 3 ... Slime, 4 ... Slip layer-treated concrete pile, 5 ... Joint, 6 ... Injection pipe, 7 ... End Plate, 8 ... Rubber band, 9 ... Band, 10 ...
Bag, 11 …… Concrete, 12 …… Reinforcing bar or PC steel rod
Claims (1)
中に、杭下端部から上方における外周部のみを取り囲む
ように取り付けられた袋体を有する既製杭を、その先端
部が掘削底面から上方に杭外径の0.5〜２倍の位置に位
置するよう沈設し、しかる後に袋体内に固結性流動体を
注入して膨張拡大させることを特徴とする袋体を有する
既製杭の施工方法。1. A ready-made pile having a bag body mounted so as to surround only the outer peripheral portion above the lower end of the pile in a support layer in which cement milk and the ground are mixed, the tip of which is above the excavated bottom surface. A method for constructing a prefabricated pile having a bag body, characterized in that the bag is sunk so as to be positioned at a position 0.5 to 2 times the outer diameter of the pile, and then a solidifying fluid is injected into the bag body to expand and expand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62174372A JPH0833009B2 (en) | 1987-07-13 | 1987-07-13 | Construction method for ready-made piles with bags |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62174372A JPH0833009B2 (en) | 1987-07-13 | 1987-07-13 | Construction method for ready-made piles with bags |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6417920A JPS6417920A (en) | 1989-01-20 |
| JPH0833009B2 true JPH0833009B2 (en) | 1996-03-29 |
Family
ID=15977461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62174372A Expired - Lifetime JPH0833009B2 (en) | 1987-07-13 | 1987-07-13 | Construction method for ready-made piles with bags |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0833009B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2742809B2 (en) * | 1989-02-28 | 1998-04-22 | マツダ株式会社 | Multi-cylinder engine intake system |
| EP2422893A1 (en) * | 2010-08-27 | 2012-02-29 | Siemens Aktiengesellschaft | Operating method for a milling system for milling flat milled goods with mill wear prognosis |
| CN109469050A (en) * | 2018-12-25 | 2019-03-15 | 高永光 | Grouting technology after installing hollow (hole) annular steel plate capsule (cavity) at the bottom of cast-in-place pile |
| CN116516972A (en) * | 2023-02-13 | 2023-08-01 | 高永光 | Tubular pile bottom grouting device and use method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57127016A (en) * | 1981-01-29 | 1982-08-07 | Yutaka Asaoka | Driving method for pile |
| JPS6210325A (en) * | 1985-07-04 | 1987-01-19 | Asahi Chem Ind Co Ltd | Foot protecting of pile |
-
1987
- 1987-07-13 JP JP62174372A patent/JPH0833009B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6417920A (en) | 1989-01-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080329 Year of fee payment: 12 |