JPS6026719A - Removal of head of cast-in-place concrete pile - Google Patents
Removal of head of cast-in-place concrete pileInfo
- Publication number
- JPS6026719A JPS6026719A JP13510083A JP13510083A JPS6026719A JP S6026719 A JPS6026719 A JP S6026719A JP 13510083 A JP13510083 A JP 13510083A JP 13510083 A JP13510083 A JP 13510083A JP S6026719 A JPS6026719 A JP S6026719A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- reinforcing bars
- cut
- head
- pile
- 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
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 51
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 230000003068 static effect Effects 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 description 11
- 229920006328 Styrofoam Polymers 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000008261 styrofoam Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/005—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof removing the top of placed piles of sheet piles
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は静的破砕剤を用いた場所打コンクリート杭頭部
の除去方法に関し、さらに詳しくは突起部材を有する鉄
筋を使用することによりミ静的破砕剤を膨張させて場所
打コンクリート杭頭部を小割に破砕する除去方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing the head of a cast-in-place concrete pile using a static crushing agent, and more specifically, the present invention relates to a method for removing the head of a cast-in-place concrete pile using a static crushing agent. This invention relates to a method for removing cast-in-place concrete pile heads by breaking them into small pieces.
場所打コンクリート杭の場合、その杭頭部の余盛シコン
クリートを除去することは不可欠である。この除去作業
は一般に手はつりまたは機械を用いて行われているが、
振動、騒音、発塵の公害問題を生じるだけでなく、手間
と時間が非常にかメジ非能率であった。そのため余盛り
コンクリート内に位置する鉄筋をあらかじめ被覆材で被
覆し、鉄筋とコンクリートとの付着を防止することが提
案されているがそれだけでは上記の諸問題は十分解決し
たとは言えない。In the case of cast-in-place concrete piles, it is essential to remove the excess concrete at the head of the pile. This removal work is generally done by hand or mechanically, but
Not only did this cause pollution problems such as vibration, noise, and dust, but it was also extremely time consuming and inefficient. Therefore, it has been proposed to cover the reinforcing bars located in the excess concrete with a covering material in advance to prevent the reinforcing bars from adhering to the concrete, but this alone cannot be said to have sufficiently solved the above problems.
一方近年静的破砕剤を用いてコンクＩＪ −１−を破砕
除去する方法が行われている。本出願人はこの方法につ
いての改良を特願昭５７−６８０７０で提案したが、杭
頭部をコンクリート切断予定面から切断はできても、切
断された杭頭部を廃棄処理するのに、さらにこれを小割
しなければならなかった。On the other hand, in recent years, a method of crushing and removing conch IJ-1- using a static crushing agent has been practiced. The present applicant proposed an improvement to this method in Japanese Patent Application No. 57-68070, but although it is possible to cut the pile head from the concrete cutting surface, it is difficult to dispose of the cut pile head. I had to cut this into pieces.
本発明は、この小割作業を杭頭の切断と同時に行うこと
のできる方法で、その要旨は余盛シコンクリート内に位
置する鉄筋に突起部材を設け、該鉄筋はコンクリートの
付着を防止するため被覆材で被覆してコンクリートを打
設し、コンクリートの硬化後、コンクリート切断予定面
に設けた複数本の孔に静的破砕剤を充填し、ついで該静
的破砕剤を膨張させて破砕する場所打コンクＩＪ −ト
杭頭部の除去方法にある。The present invention is a method that can perform this subdivision work at the same time as cutting the pile cap, and its gist is that protruding members are provided on the reinforcing bars located in the reinforced concrete, and the reinforcing bars are used to prevent concrete from adhering. A place where concrete is covered with a covering material and poured, and after the concrete has hardened, a static crushing agent is filled into multiple holes made in the concrete cutting surface, and then the static crushing agent is expanded and crushed. It is in the method for removing the head of a pile.
場所打コンクリートの切断予定面に設けた複数本の孔に
静的破砕剤を充填し膨張させれば杭の横方向に亀裂が生
じると同時に縦方向への力が生じる。この際余盛シコン
クリート内に位置する鉄筋に強固に取付けられた突起部
材が上記の力を受ければ、その反力が余盛シコンクリー
トに働き、くさび作用でその余盛りコンクリートに縦方
向の亀裂を生じせしめる。なおこの場合、鉄筋にはコン
クリートの付着を防止するだめの被覆材を被覆している
ので上記の力を妨害することはない。When a static crushing agent is filled into multiple holes in the planned cut surface of cast-in-place concrete and allowed to expand, cracks occur in the horizontal direction of the pile, and at the same time, force is generated in the vertical direction. At this time, if the protruding member firmly attached to the reinforcing steel located within the concrete reinforcement is subjected to the above force, the reaction force will act on the concrete reinforcement, causing longitudinal cracks in the concrete reinforcement due to a wedge effect. cause In this case, the reinforcing bars are covered with a covering material that prevents concrete from adhering to them, so the above-mentioned force will not be interfered with.
鉄筋に設けた突起部材はこのような働きをするものであ
るから、その形状としてはくさび状のもの、おの状のも
の、また断面が円形寸たは星状の錐体あるいは鉄筋の先
端を１８０°折シ曲けたものでもよいが、その中でもく
さび状のものを杭の中心に向けておけば効率のよい小割
ができる。また鉄筋に設ける突起部材の歯の位置は余盛
りコンクリートの上部から２０〜３０％下の位置が望ま
しい。Since the protruding members provided on the reinforcing bars function in this way, they can be shaped like a wedge, a hatchet, a cone with a circular or star-shaped cross section, or the tip of the reinforcing bar. You can use one that is bent 180 degrees, but if you point the wedge-shaped one toward the center of the pile, you can make small cuts more efficiently. Further, it is desirable that the teeth of the protruding members provided on the reinforcing bars be located 20 to 30% below the top of the excess concrete.
突起部材は小割シしたい大きさに合せて鉄筋の周囲に適
宜数設ける。An appropriate number of protruding members are provided around the reinforcing bar depending on the desired size of the cut.
鉄筋用の被覆材としては市販されている紙製、発泡スチ
ロール製、筒状のシース管でもよく、また粘着性テープ
を鉄筋に巻き付けてもよい。The covering material for the reinforcing bars may be a commercially available paper, styrofoam, or cylindrical sheath tube, or an adhesive tape may be wrapped around the reinforcing bars.
本発明方法を図によって説明する。The method of the present invention will be explained using figures.
第１図はコンクリート杭頭部の平面図であり、第２図は
その側断面図である。鉄筋１がコンクリート内に多数積
えられ、被覆材５で被覆されている０この中の数本、例
えば第１図では６本の鉄筋にくさび状の突起部材２が設
けられている。第３図は鉄筋のくさび状突起部材の拡大
図で（ト）は側面図、ＣＢ）は突起部材の正面図である
。FIG. 1 is a plan view of the concrete pile head, and FIG. 2 is a side sectional view thereof. A large number of reinforcing bars 1 are piled up in concrete and covered with a covering material 5. Wedge-shaped projecting members 2 are provided on several of these reinforcing bars, for example, six in FIG. 1. FIG. 3 is an enlarged view of the wedge-shaped protruding member of the reinforcing bar, (G) is a side view, and CB) is a front view of the protruding member.
余盛りコンクＩＪ−） ８の破砕はまず切断予定面６で
幅約２閣の横の亀裂を起させてから、さらにその幅を広
げる段階ではじめて突起部材２の歯３が余盛りコンクリ
ートに対し作用するよう、余盛シコンクリート８と歯３
との間が垂直方向で約２咽程度縮む余地を設けておく方
がよい。この縮む余地を設けておかないと、切断予定面
での横の亀裂と余盛シコンクリートの小割のだめの縦の
亀裂とを同時に行わせることになるため、多大の膨張圧
を必要とするだけでなく、杭の残す部分１０にまで縦方
向の亀裂が及んでｌ。For the crushing of excess concrete IJ-) 8, first a horizontal crack of approximately two widths is caused at the planned cutting surface 6, and only at the stage of widening the width is the teeth 3 of the protruding member 2 touching the excess concrete. Reinforced concrete 8 and teeth 3 to work together.
It is better to leave room for the space between the two sides to shrink by about two degrees in the vertical direction. If we do not allow room for this shrinkage, horizontal cracking at the planned cutting surface and vertical cracking at the small break in the concrete will occur at the same time, requiring a large amount of expansion pressure. Instead, the vertical cracks extended to the remaining part 10 of the pile.
オうおそれがある。There is a risk.
この縮む余地を設ける手段としては突起部材の歯に強い
力で縮む＠覆材９、例えば発泡スチロール、ゴム、紙等
の弾性のあるもので被覆してもよく、あるいは突起部材
を鉄筋に取付ける場合、突起部材に長穴を設ける等の細
工をして、突起部材は最初に約２ｖａｎ余盛りコンクリ
ートと一緒に膨張力によって縦方向に動くが、それ以上
は動かないようにしてもよい。As a means for providing room for this shrinkage, the teeth of the protruding member may be covered with a covering material 9 that shrinks with a strong force, for example, an elastic material such as styrofoam, rubber, paper, etc., or when the protruding member is attached to a reinforcing bar, The projecting member may be modified by providing elongated holes or the like so that the projecting member first moves vertically along with about 2 vans of excess concrete due to the expansion force, but does not move any further.
かくして静的破砕剤の膨張圧によって余盛りコンクリー
トは切断予定面で小割に破砕される。In this way, the excess concrete is crushed into small pieces at the planned cutting surface by the expansion pressure of the static crushing agent.
本発明によれば、コンクリート杭頭部の切断と同時に縦
方向の小割ができる。したがって従来の手または機械に
よる小割作業あるいは縦に穿孔して静的破砕剤で破砕す
る小割作業に比べ、極めて簡単でしかも効率よく小割作
業が行える。According to the present invention, the concrete pile head can be cut into small pieces in the vertical direction at the same time. Therefore, compared to the conventional dicing operation by hand or machine, or the dicing operation in which vertical holes are drilled and crushed using a static crushing agent, the dicing operation can be performed extremely easily and efficiently.
次に実施例によって本発明を具体的に説明するＯ
実施例
第１図の如き直径１４００ ｉｎの場所打コンクリート
杭の頭部約１ｍの余盛シコンクリートを除去するため、
突起部材を６個用いた。この突起部材は鉄筋にはめ込む
だめの管、歯、ボルト、被覆材からなる。歯は長さ２０
０ｍｍ、厚さ３０ｍ１歯の部分の高さ２６叫、角度６０
°からなり、さらに被覆材（発泡スチロール）で約２順
被覆されている。この突起部材の管を余盛りコンクリー
ト内に位置する鉄筋にはめ込みボルトで固定した。寸だ
鉄筋（外径５４解）はコンクリートの付着を防止するた
めポリスチレン保温筒（内径３４謹）によシ鉄筋に被覆
した。Next, the present invention will be specifically explained with reference to Examples.O Example: In order to remove about 1 m of excess concrete from the head of a cast-in-place concrete pile with a diameter of 1400 inches as shown in Fig. 1,
Six protruding members were used. This projecting member consists of a tube, teeth, bolts, and sheathing material that fit into the reinforcing steel. Teeth are 20 long
0mm, thickness 30m1 height of tooth part 26mm, angle 60mm
It is further covered with a covering material (styrofoam) approximately twice. The tube of this projecting member was fitted into the reinforcing bars located in the excess concrete and fixed with bolts. The thick reinforcing bars (outer diameter: 54 mm) were covered with polystyrene heat-insulating cylinders (inner diameter: 34 mm) to prevent concrete from adhering to them.
コンクリートを打設し、その硬化後コンクリート切断予
定面に設けた８本の孔に静的破砕剤を充填し、静的破砕
剤を膨張させたところ、１６時間後に切断予定面に亀裂
が生じ、さらにその後間もなく余盛シコンクリートに縦
の亀裂が生じ６個に分割破砕された。After concrete was placed and hardened, a static crushing agent was filled into the eight holes made on the concrete surface to be cut, and when the static crushing agent was expanded, cracks appeared on the surface to be cut after 16 hours. Shortly thereafter, vertical cracks appeared in the overlay concrete and it was broken into six pieces.
第１図および第２図は本発明方法の説明用コンクリート
杭頭部図で第１図は平面図、第２図は側面図を示す。第
３図は本発明のくさび状突起部材の拡大図で囚は側面図
、（Ｂ）は正面図である０
１・・鉄筋、２・・・突起部材、３・・突起部材の歯、
４・ボルト、５・・・被覆材、６・・切断予定面、７・
・静的破砕剤用孔、８・・余盛９コンクリート、９・・
・突起部材の被覆材、１０・コンクリートの残す部分。
特許出願人 日本セメント株式会社
代理人弁理士伊東 彰1 and 2 are views of the head of a concrete pile for explaining the method of the present invention, with FIG. 1 showing a plan view and FIG. 2 showing a side view. Fig. 3 is an enlarged view of the wedge-shaped protrusion member of the present invention, the figure is a side view, and (B) is a front view.
4. Bolt, 5. Covering material, 6. Planned cutting surface, 7.
・Hole for static crushing agent, 8... Remaining pile 9 concrete, 9...
- Covering material for protruding parts, 10 - Remaining part of concrete. Patent applicant Akira Ito, patent attorney representing Nippon Cement Co., Ltd.
Claims (2)
月を設け、該鉄筋はコンクリートの付着を防止するため
被覆材で被覆してコンクリートを打設し、コンクリート
の硬化後、コンクリート切断予定面に設けた複数本の孔
に静的破砕剤を充填し、ついで該静的破砕剤を膨張させ
て破砕することを特徴とする場所打コンクリート杭頭部
の除去方法。(1) Protrusions are provided on the reinforcing bars located within the concrete, the reinforcing bars are covered with a covering material to prevent concrete from adhering, and concrete is poured. After the concrete hardens, the concrete is to be cut on the surface where the concrete is to be cut. 1. A method for removing the head of a cast-in-place concrete pile, comprising filling a plurality of holes provided in a pile with a static crushing agent, and then expanding and crushing the static crushing agent.
１）項記載の除去方法。(2) Claim No. (2) in which the protrusion member is wedge-shaped
Removal method described in section 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13510083A JPS6026719A (en) | 1983-07-26 | 1983-07-26 | Removal of head of cast-in-place concrete pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13510083A JPS6026719A (en) | 1983-07-26 | 1983-07-26 | Removal of head of cast-in-place concrete pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6026719A true JPS6026719A (en) | 1985-02-09 |
| JPH046813B2 JPH046813B2 (en) | 1992-02-07 |
Family
ID=15143835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13510083A Granted JPS6026719A (en) | 1983-07-26 | 1983-07-26 | Removal of head of cast-in-place concrete pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6026719A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6391282A (en) * | 1986-10-06 | 1988-04-21 | Dainippon Printing Co Ltd | Embossed-grain pattern decorative material |
| CN103452114A (en) * | 2013-09-23 | 2013-12-18 | 甘肃路桥建设集团有限公司 | Bridge cast-in-place pile head chiseling method |
-
1983
- 1983-07-26 JP JP13510083A patent/JPS6026719A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6391282A (en) * | 1986-10-06 | 1988-04-21 | Dainippon Printing Co Ltd | Embossed-grain pattern decorative material |
| CN103452114A (en) * | 2013-09-23 | 2013-12-18 | 甘肃路桥建设集团有限公司 | Bridge cast-in-place pile head chiseling method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH046813B2 (en) | 1992-02-07 |
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