JPH0348292B2 - - Google Patents
Info
- Publication number
- JPH0348292B2 JPH0348292B2 JP17331286A JP17331286A JPH0348292B2 JP H0348292 B2 JPH0348292 B2 JP H0348292B2 JP 17331286 A JP17331286 A JP 17331286A JP 17331286 A JP17331286 A JP 17331286A JP H0348292 B2 JPH0348292 B2 JP H0348292B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- concrete
- pile
- reinforcing
- cast
- 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
- 229910000831 Steel Inorganic materials 0.000 claims description 70
- 239000010959 steel Substances 0.000 claims description 70
- 239000004567 concrete Substances 0.000 claims description 46
- 230000003014 reinforcing effect Effects 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 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
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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、杭頭部を鋼管で補強した場所打ち杭
の造成方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for constructing a cast-in-place pile in which the pile head is reinforced with a steel pipe.
第６図に示すように、杭頭部の鉄筋コンクリー
ト部分ａに鋼管ｂを套嵌固定して、杭頭部を補強
した場所打ち杭は、既に知られている。
As shown in FIG. 6, a cast-in-place pile is already known in which the pile head is reinforced by fitting and fixing a steel pipe b to a reinforced concrete portion a of the pile head.
しかしながら、上記の従来例において、鋼管ｂ
の外面が地盤（孔壁）に接しており、内面のみが
コンクリートに接しているに過ぎないため、鋼管
ｂとコンクリートとの付着力が小さく、鋼管ｂに
よる補強効果が乏しかつた。また鋼管Ｂの内面に
多数の環状溝を形成してコンクリートとの付着力
を高めたものも知られているが、これによる場合
は、加工費が嵩むため、鋼管ｂが高価なものとな
りコスト上不利であつた。
However, in the above conventional example, the steel pipe b
Since the outer surface of the steel pipe b was in contact with the ground (hole wall) and only the inner surface was in contact with the concrete, the adhesion force between the steel pipe b and the concrete was small, and the reinforcing effect of the steel pipe b was insufficient. It is also known that a large number of annular grooves are formed on the inner surface of the steel pipe B to increase its adhesion to concrete, but in this case, the processing cost increases, making the steel pipe B expensive, resulting in a cost increase. It was a disadvantage.
また、上記いずれの場合も、鋼管ｂの外面が地
盤に接しているため、地下水によつて鋼管ｂに錆
が発生しやすく、錆による強度低下を考慮する必
要があつた。 Furthermore, in any of the above cases, since the outer surface of the steel pipe b is in contact with the ground, the steel pipe b is likely to rust due to underground water, and it was necessary to take into account the reduction in strength due to rust.
本発明の目的は、上記従来例の問題点を解消す
ることにある。 An object of the present invention is to solve the problems of the conventional example.
上記の目的を達成するために、本発明が講じた
技術的手段は、次のとおりである。即ち、本発明
による場所打ち杭の造成方法は、周壁部にコンク
リート骨材の最大径よりも大きな多数の孔を分布
して配設してなる杭頭補強用鋼管を鉄筋かごに予
め套嵌固定しておき、この鋼管付き鉄筋かごを、
前記鋼管の外径よりも大径の杭孔に挿入した後、
杭孔内にコンクリートを打設して、前記鋼管が内
外面ともコンクリート内に埋没した場所打ち杭を
造成する点に特徴がある。
The technical means taken by the present invention to achieve the above object are as follows. That is, the method for constructing cast-in-place piles according to the present invention involves pre-fitting and fixing a steel pipe for reinforcing the pile head, which is formed by distributing a large number of holes larger than the maximum diameter of the concrete aggregate in the peripheral wall, to a reinforcing cage. Then, this reinforcing bar cage with steel pipe,
After inserting into a pile hole with a diameter larger than the outer diameter of the steel pipe,
The method is characterized in that concrete is poured into the pile hole to create a cast-in-place pile in which the steel pipe is buried in the concrete on both the inner and outer surfaces.
上記の構成によれば、鋼管の内側にコンクリー
トを打設しただけでも、コンクリートが鋼管周壁
部の孔から鋼管外側へと流れ出し、鋼管の内外面
がコンクリート内に埋没されることになる。
According to the above configuration, even if concrete is simply placed inside the steel pipe, the concrete flows out from the hole in the peripheral wall of the steel pipe to the outside of the steel pipe, and the inner and outer surfaces of the steel pipe are buried in the concrete.
コンクリートの硬化後においては、鋼管の内外
にコンクリートが位置し、当該コンクリートは鋼
管周壁部の孔を介して一体化しているので、鋼管
とコンクリートとの付着力が大きく、両者の一体
性が確保される。 After the concrete hardens, the concrete is located inside and outside the steel pipe, and the concrete is integrated through the holes in the peripheral wall of the steel pipe, so the adhesion between the steel pipe and concrete is strong, ensuring the integrity of both. Ru.
また鋼管の外周にコンクリートが位置し、鋼管
の外周がアルカリ性のコンクリート層で被覆され
た状態となるので錆が発生しにくく、鋼管による
補強効果が長年月にわたつて発揮される。 In addition, since the concrete is placed around the outer circumference of the steel pipe, and the outer circumference of the steel pipe is covered with an alkaline concrete layer, rust is less likely to occur, and the reinforcing effect of the steel pipe can be demonstrated for many years.
以下、本発明を実施例を図面に基づいて説明す
る。
Hereinafter, embodiments of the present invention will be described based on the drawings.
第１図は本発明に係る場所打ち杭を示し、第２
図はコンクリート打設前の状態における要部横断
平面図、第３図は杭頭補強用鋼管の横断平面図、
第４図は杭頭補強用鋼管を鉄筋かごに固定する連
結金具の斜視図である。第５図イ〜ホは場所打ち
杭の造成手順を示す概略側面図である。 FIG. 1 shows a cast-in-place pile according to the present invention, and the second
The figure is a cross-sectional plan view of the main part before concrete placement, Figure 3 is a cross-sectional plan view of the steel pipe for reinforcing the pile cap,
FIG. 4 is a perspective view of a connecting fitting for fixing a pile cap reinforcing steel pipe to a reinforcing cage. FIGS. 5A to 5E are schematic side views showing the procedure for creating cast-in-place piles.
杭頭補強用鋼管１は、鉄筋かご２よりも大径で
あり、鉄筋かご２に套嵌固定した状態において、
鋼管１内面と鉄筋かご２との間に、コンクリート
３が充填に支障がない程度の環状空隙が形成され
るように構成してある。鋼管１の周壁部には、コ
ンクリート骨材の最大径よりも大きな（例えば、
最小径をコンクリート骨材の最大径の2.5倍以上
とした）多数の孔４…を分布配設してある。 The steel pipe 1 for reinforcing the pile head has a larger diameter than the reinforcing bar cage 2, and when it is fitted and fixed to the reinforcing bar cage 2,
The structure is such that an annular gap is formed between the inner surface of the steel pipe 1 and the reinforcing cage 2 to the extent that concrete 3 can be filled without any problem. The peripheral wall of the steel pipe 1 has a diameter larger than the maximum diameter of the concrete aggregate (for example,
A large number of holes 4 (with a minimum diameter of at least 2.5 times the maximum diameter of the concrete aggregate) are arranged in a distributed manner.
前記孔４…は、単なる貫通孔であつてもよい
が、この実施例では、図示のように、鋼管１の周
壁部に多数の切り込みを入れ、切り込みにより形
成される舌片部５…を鋼管１内方へ折り曲げて、
前記孔４…を構成することにより、鋼管１とコン
クリート３との付着力をより一層高めてある。２
ａは杭主筋、２ｂはフープ筋であり、これらによ
り前記鉄筋かご２を構成してある。鋼管１は鉄筋
かご２に略同芯状に套嵌され、連結金具６により
鉄筋かご２に固定されている。図示の連結金具６
は、前記孔４…の幾つかに挿入して孔縁に係合さ
せるフツクボルト６ａと、鉄筋かご２を内側から
係止する係止片６ｂと、ナツト６ｃとによつて構
成されている。７は杭孔であり、杭孔７の径は、
鋼管１よりも大径で、鋼管１の外周に、必要な被
厚のコンクリート３の層が形成されるように構成
されている。 The holes 4 may be simple through holes, but in this embodiment, as shown in the figure, a number of cuts are made in the peripheral wall of the steel pipe 1, and the tongue pieces 5 formed by the cuts are inserted into the steel pipe. 1 Fold inward,
By configuring the holes 4, the adhesion between the steel pipe 1 and the concrete 3 is further increased. 2
a is a pile main reinforcement, 2b is a hoop reinforcement, and these constitute the reinforcing bar cage 2. The steel pipe 1 is fitted around the reinforcing bar cage 2 in a substantially concentric manner, and is fixed to the reinforcing bar cage 2 by a connecting fitting 6. The illustrated connecting fitting 6
is composed of hook bolts 6a that are inserted into some of the holes 4 and engaged with the edges of the holes, a locking piece 6b that locks the reinforcing bar cage 2 from the inside, and a nut 6c. 7 is a pile hole, and the diameter of the pile hole 7 is
It has a larger diameter than the steel pipe 1, and is configured so that a layer of concrete 3 of a required thickness is formed around the outer periphery of the steel pipe 1.
尚、鋼管１の上端は、鉄筋かご２の上端よりも
数十cm〜１ｍ程度下げてある。具体的には、鋼管
１の上端が、設計上の杭天端に位置し、鋼管１よ
りも上方に突き出た鉄筋かご２（少なくとも、杭
主筋２ａ）が図外のフーチングコンクリート内に
定着されるように構成してある。 The upper end of the steel pipe 1 is lower than the upper end of the reinforcing bar cage 2 by several tens of cm to 1 m. Specifically, the upper end of the steel pipe 1 is located at the designed top of the pile, and the reinforcing bar cage 2 (at least the main reinforcement of the pile 2a) that protrudes above the steel pipe 1 is fixed in footing concrete (not shown). It is configured.
上記の場所打ち杭は、次のようにして造成され
る。 The above cast-in-place piles are constructed as follows.
第５図イに示すように、地盤を掘削して杭孔７
を形成する一方、地上では、前記鋼管１を鉄筋か
ご２に予め套嵌固定しておく。鋼管１の上端は、
先に述べた通り、鉄筋かご２の上端よりも下げて
おく。８は孔壁の安定化液（例えば、ベントナイ
ト溶液）である。 As shown in Figure 5A, the ground is excavated and the pile hole 7 is
Meanwhile, on the ground, the steel pipe 1 is previously fitted and fixed to the reinforcing bar cage 2. The upper end of the steel pipe 1 is
As mentioned earlier, keep it lower than the top of reinforcing bar cage 2. 8 is a stabilizing liquid for the pore walls (for example, a bentonite solution).
スライム処理を行つた後、第５図ロに示すよう
に、鋼管１付き鉄筋かご２を、前記杭孔７に挿入
し、次いで、第５図ハに示すように、トレミー管
（図外）を用いて、杭孔７内にコンクリート３を
地表まで打設する。鋼管１の上端から地表までの
コンクリート部分はスライム混入の虞れがある余
盛コンクリートである。上記のコンクリート３の
打設は、鋼管１の内側で行われるが、鋼管１の周
壁部には、コンクリート骨材の最大径よりも大き
な多数の孔４…が配設されているので、コンクリ
ート３が孔４…からも鋼管１の外周空間部に流入
し、鋼管１は、内外面ともコンクリート３内に埋
没した状態となる。 After the slime treatment, as shown in FIG. 5B, the reinforcing bar cage 2 with the steel pipe 1 is inserted into the pile hole 7, and then, as shown in FIG. concrete 3 is cast into the pile hole 7 up to the ground surface. The concrete portion from the upper end of the steel pipe 1 to the ground surface is excess concrete that may be contaminated with slime. The concrete 3 described above is placed inside the steel pipe 1, but since the peripheral wall of the steel pipe 1 is provided with a large number of holes 4 larger than the maximum diameter of the concrete aggregate, the concrete 3 is placed inside the steel pipe 1. Flows into the outer peripheral space of the steel pipe 1 from the holes 4 as well, and the steel pipe 1 becomes buried in the concrete 3 on both the inner and outer surfaces.
コンクリート３の硬化後、第５図ニ，ホに示す
ように、杭周囲の地盤を、フーチング底９まで掘
削し、鋼管１の上端よりも上方に位置する余盛コ
ンクリート３′をはりつ取るのある。 After the concrete 3 has hardened, the ground around the pile is excavated to the footing bottom 9, and the excess concrete 3' located above the upper end of the steel pipe 1 is peeled off, as shown in Fig. 5 D and E. be.
本発明は、上述した構成よりなるから、次の効
果を奏して得るのである。
Since the present invention has the above-described configuration, the following effects can be obtained.
杭頭補強用鋼管には、その周壁部にコンクリ
ート骨材の最大径よりも大きな多数の孔を分布
配設してあるので、鋼管の内側にコンクリート
を打設しただけでも、コンクリートが前記孔か
ら鋼管外側へと流れ出し、鋼管の内外面がコン
クリート内に埋没されることになる。しかも、
前記鋼管は、予め鉄筋かごに套嵌固定した状態
で、杭孔に挿入されるので、作業が容易である
のみならず、鋼管が鉄筋かごに対して偏芯する
虞れがない。 The steel pipe for reinforcing the pile cap has a large number of holes distributed in its peripheral wall that are larger than the maximum diameter of the concrete aggregate, so even if concrete is simply placed inside the steel pipe, the concrete will flow through the holes. It flows out to the outside of the steel pipe, and the inner and outer surfaces of the steel pipe are buried in concrete. Moreover,
Since the steel pipe is inserted into the pile hole in a state in which the steel pipe is fitted and fixed to the reinforcing bar cage in advance, the work is not only easy, but there is no risk of the steel pipe being eccentric with respect to the reinforcing bar cage.
コンクリートの硬化後においては、鋼管の内
外にコンクリートが位置し、当該コンクリート
は鋼管周壁部の孔を介して一体化しているの
で、鋼管とコンクリートとの付着力が大きく、
両者の一体性が確保される。 After the concrete hardens, the concrete is located inside and outside the steel pipe, and the concrete is integrated through the holes in the peripheral wall of the steel pipe, so the adhesion between the steel pipe and the concrete is large.
Integrity between the two is ensured.
従つて、鋼管による杭頭部の補強効果が高
く、杭頭部の曲げ強度が増大し、剪断強度及び
靭性が増大するのである。 Therefore, the reinforcement effect of the pile head by the steel pipe is high, the bending strength of the pile head increases, and the shear strength and toughness of the pile head increase.
鋼管の外周にもコンクリートが位置し、鋼管
の外面がアルカリ性のコンクリート層で被覆さ
れた状態となるので錆が発生しにくく、鋼管に
よる補強効果が長年月にわたつて発揮される。 Concrete is also placed around the outer periphery of the steel pipe, and the outer surface of the steel pipe is coated with a layer of alkaline concrete, which prevents rust from forming and allows the reinforcing effect of the steel pipe to be demonstrated for many years.
第１図乃至第５図イ，ロ，ハ，ニ，ホは本発明
の一実施例を示し、第１図は場所打ち杭の杭頭部
の縦断側面図、第２図はコンクリート打設前の状
態における要部横断平面図、第３図は杭頭補強用
鋼管の横断平面図、第４図は杭頭補強用鋼管を鉄
筋かごに固定する連結金具の斜視図である。第５
図イ〜ホは場所打ち杭の造成手順を示す概略側面
図である。第６図は従来例の説明図である。
１……鋼管、２……鉄筋かご、３……コンクリ
ート、４……孔。
Figures 1 to 5 A, B, C, D, and H show one embodiment of the present invention, in which Figure 1 is a vertical cross-sectional side view of the pile head of a cast-in-place pile, and Figure 2 is before concrete placement. FIG. 3 is a cross-sectional plan view of a steel pipe for reinforcing a pile cap, and FIG. 4 is a perspective view of a connecting fitting for fixing a steel pipe for reinforcing a pile cap to a reinforcing cage. Fifth
Figures I to E are schematic side views showing the procedure for creating cast-in-place piles. FIG. 6 is an explanatory diagram of a conventional example. 1... Steel pipe, 2... Rebar cage, 3... Concrete, 4... Hole.
Claims (1)
きな多数の孔を分布配設してなる杭頭補強用鋼管
を鉄筋かごに予め套嵌固定しておき、この鋼管付
き鉄筋かごを、前記鋼管の外径よりも大径の杭孔
に挿入した後、杭孔内にコンクリートを打設し
て、前記鋼管が内外面ともコンクリート内に埋没
した場所打ち杭を造成することを特徴とする場所
打ち杭の造成方法。 ２ 前記多数の孔が、鋼管の周壁部に切り込みを
設け、この切り込みによる舌片部を鋼管の内側へ
向けて折り曲げることによつて形成されているこ
とを特徴とする特許請求の範囲第１項に記載の場
所打ち杭の造成方法。[Scope of Claims] 1 A steel pipe for reinforcing a pile head, which is formed by distributing a large number of holes larger than the maximum diameter of the concrete aggregate in the surrounding wall part, is fitted and fixed in advance to a reinforcing bar cage, and the reinforcing bar with this steel pipe is After inserting the cage into a pile hole having a diameter larger than the outer diameter of the steel pipe, concrete is poured into the pile hole to create a cast-in-place pile in which the steel pipe is buried in concrete on both the inner and outer surfaces. A distinctive method for creating cast-in-place piles. 2. Claim 1, wherein the plurality of holes are formed by providing notches in the peripheral wall of the steel pipe and bending the tongue portions formed by the cuts toward the inside of the steel pipe. The method for constructing cast-in-place piles described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17331286A JPS6332018A (en) | 1986-07-23 | 1986-07-23 | Formation of cast-in-place pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17331286A JPS6332018A (en) | 1986-07-23 | 1986-07-23 | Formation of cast-in-place pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6332018A JPS6332018A (en) | 1988-02-10 |
| JPH0348292B2 true JPH0348292B2 (en) | 1991-07-24 |
Family
ID=15958110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17331286A Granted JPS6332018A (en) | 1986-07-23 | 1986-07-23 | Formation of cast-in-place pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6332018A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014109175A (en) * | 2012-12-04 | 2014-06-12 | Takenaka Komuten Co Ltd | Construction method for steel pipe concrete pile and steel pipe pile |
| JP2016000921A (en) * | 2014-06-12 | 2016-01-07 | エコ ジャパン株式会社 | Dowels pile and construction method of dowels pile |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007008449A (en) | 2005-05-31 | 2007-01-18 | Denso Corp | Vehicular air-conditioner |
| KR100910576B1 (en) | 2007-11-02 | 2009-08-04 | 쌍용건설 주식회사 | Embed anchor and construction method of composite basement wall using the same |
| JP6213758B2 (en) * | 2012-04-19 | 2017-10-18 | ジャパンパイル株式会社 | Cast-in-place steel pipe concrete pile and its construction method |
| CN104878929B (en) * | 2015-06-01 | 2017-01-11 | 中国建筑第八工程局有限公司 | Reinforced concrete steel pipe column construction method |
| JP6406560B2 (en) * | 2017-07-10 | 2018-10-17 | ジャパンパイル株式会社 | Cast-in-place steel pipe concrete pile and its steel pipe |
-
1986
- 1986-07-23 JP JP17331286A patent/JPS6332018A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014109175A (en) * | 2012-12-04 | 2014-06-12 | Takenaka Komuten Co Ltd | Construction method for steel pipe concrete pile and steel pipe pile |
| JP2016000921A (en) * | 2014-06-12 | 2016-01-07 | エコ ジャパン株式会社 | Dowels pile and construction method of dowels pile |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6332018A (en) | 1988-02-10 |
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