JPS6334256B2 - - Google Patents
Info
- Publication number
- JPS6334256B2 JPS6334256B2 JP58222339A JP22233983A JPS6334256B2 JP S6334256 B2 JPS6334256 B2 JP S6334256B2 JP 58222339 A JP58222339 A JP 58222339A JP 22233983 A JP22233983 A JP 22233983A JP S6334256 B2 JPS6334256 B2 JP S6334256B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- widening
- rod pipe
- pipe
- excavation
- 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
- 238000009412 basement excavation Methods 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 description 4
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000000078 claw Anatomy 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (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)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Earth Drilling (AREA)
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は場所打杭に於ける杭頭拡幅段付杭の施
工方法及びその装置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 stepped piles with widened pile heads in cast-in-place piles, and an apparatus therefor.
一般に場所打杭工法はまず所定地盤に杭径と所
要深度の掘削孔を穿ち、次に該掘削孔内に鉄筋篭
を吊り下げ挿入し、さらにコンクリートを打設し
て所望の鉄筋コンクリート杭を築造するもので、
これをさらに経済的に然も安全で理論的な場所打
杭とするため拡底杭が築造されている。
In general, the cast-in-place pile method involves first drilling an excavation hole of the required diameter and depth in the specified ground, then suspending and inserting a reinforcing bar cage into the excavation hole, and then pouring concrete to construct the desired reinforced concrete pile. Something,
Expanded-bottom piles have been constructed to make this method even more economical, safe, and theoretically driven-in-place piles.
例えば特公昭46−13343号に開示されるものが
ある。これは穿孔した孔底下の上を撹乱しないで
孔底の大きさを地表面で確認しながら孔底を拡げ
てゆく工法及び装置である。さらに杭の地耐力を
増すため、杭底のみならず杭頭も拡幅する工法が
提案されている。 For example, there is one disclosed in Japanese Patent Publication No. 46-13343. This is a method and device that enlarges the hole bottom while checking the size of the hole bottom on the ground surface without disturbing the area above the bottom of the drilled hole. Furthermore, in order to increase the soil bearing capacity of piles, a construction method has been proposed in which not only the pile bottom but also the pile cap is widened.
従来行なわれている拡頭部築造工法は、所要の
拡頭部径Ｄを有するスタンドパイプＡをハンマー
クラブ等により、スタンドパイプ内部の土砂を取
り除きながら、所定の深度ｈまで挿入してスタン
ドパイプ内の掘削を完了した後、軸部径ｄの掘削
ビツトをスタンドパイプ内に挿入して削孔する方
法がとられている。この場合、杭頭部の所要長ｈ
が深い場合は、スタンドパイプの挿入に著しい時
間を要することになり、又地質によつてはスタン
ドパイプの挿入が困難となる場合がある。 The conventional construction method for expanding the head of the standpipe is to insert the standpipe A having the required expanded head diameter D to a predetermined depth h using a hammer club, etc., while removing the dirt inside the standpipe, and then excavating the inside of the standpipe. After this is completed, a drilling bit with a shaft diameter d is inserted into the stand pipe and the hole is drilled. In this case, the required length of the pile head h
If the ground is deep, it will take a considerable amount of time to insert the standpipe, and depending on the geology, it may be difficult to insert the standpipe.
本発明はこの削孔の拡頭部の築造方法及びその
装置の改良に関するものである。 The present invention relates to a method for expanding the head of a drilled hole and an improvement to the device.
リバース工法に於て、杭軸孔掘削装置の上部に
予め杭頭拡幅ビツトを取り付けて置き、ロツド管
の回転により、杭軸孔掘削の進行と同時に杭頭拡
幅掘削を行ない、杭頭拡幅掘削が所定の深度に到
達したら、一旦ロツド管の回転を停止し、ロツド
管を吊り上げ杭頭拡幅ビツトをスタンドパイプ上
端まで引き上げて、拡幅翼を折り畳み、そのまま
ロツド管を吊り下ろし、杭軸孔掘削を継続して杭
頭拡幅段付杭を築造する。
In the reverse method, a pile cap widening bit is installed in advance on the top of the pile shaft hole excavation equipment, and the pile cap width is excavated at the same time as the pile shaft hole excavation progresses by rotating the rod pipe. Once the specified depth is reached, stop the rotation of the rod pipe, lift the rod pipe, pull up the pile head widening bit to the top of the stand pipe, fold the widening blades, lower the rod pipe, and continue drilling the pile shaft hole. and construct stepped piles with expanded pile heads.
次に本発明を図示の実施例に基づいて施工法及
び装置について説明する。
Next, a construction method and apparatus of the present invention will be explained based on illustrated embodiments.
まず場所打杭を築造する位置にスタンドパイプ
Ａを配設し、ハンマークラブ等によりこのスタン
ドパイプＡ内の土砂を掘削しながら、該スタンド
パイプＡを所定深度まで挿入する。そしてスタン
ドパイプの挿入を完了した後、ロツド管Ｂの先端
に軸部径ｄの掘削ビツトＣを取り付け、このビツ
トの上にスタビライザーＥ及び重錘Ｆを順次接続
固定し、更に重錘の上部に杭頭部径Ｄの拡幅用杭
頭拡幅ビツトＧを上記ロツド管に接続して該ロツ
ド管Ｂを介して回転駆動する。このロツド管の回
動にてロツド管先端の掘削ビツトＣにより軸部径
ｄの削孔を掘削するが、この時掘削ビツトより上
方に一定の間隔をおいて設けられた杭頭拡幅ビツ
トＧによつて杭頭部径Ｄの削孔が同時に行なわれ
ることになる。この杭頭拡幅ビツトＧが所定の深
度ｈに到達すれば、ロツド管Ｂの回転を一時停止
して、該杭頭拡幅ビツトＧをスタンドパイプＡの
上端まで引き上げ、止めボルト６を取り外してロ
ツド管の外周に設けた外廊鋼管１の外周に放射状
に突設した複数の拡幅翼３を折り畳み、そのまま
ロツド管Ｂを再度削孔内に吊り降ろし再びロツド
管Ｂを回転駆動して軸部径ｄの削孔を行なう。 First, a stand pipe A is placed at a position where a cast-in-place pile is to be constructed, and the stand pipe A is inserted to a predetermined depth while excavating earth and sand within the stand pipe A using a hammer club or the like. After inserting the standpipe, attach a drilling bit C with a shaft diameter d to the tip of the rod pipe B, connect and fix the stabilizer E and the weight F in order on this bit, and then attach the top of the weight to the bit. A pile head widening bit G having a pile head diameter D is connected to the rod pipe and rotated through the rod pipe B. With this rotation of the rod pipe, a hole with a shaft diameter d is excavated using the drilling bit C at the tip of the rod pipe. Therefore, the drilling of the pile head diameter D will be performed at the same time. When the pile head widening bit G reaches a predetermined depth h, the rotation of the rod pipe B is temporarily stopped, the pile head widening bit G is pulled up to the upper end of the stand pipe A, the retaining bolt 6 is removed, and the rod pipe The plurality of widening blades 3 protruding radially from the outer periphery of the outer corridor steel pipe 1 are folded up, and the rod pipe B is suspended into the drilled hole again. Perform hole drilling.
上記杭頭拡幅ビツトＧの構造は、外廊鋼管１に
は拡幅翼３が嵌挿され掘削に伴う掘削翼３の上昇
を拘束し、その下降は自由となる如き、型切込部
１ａを設け、リブ２によつてロツド管Ｂに固定す
る。リブ２は拡幅翼３の両側に設け、拡幅翼３が
上下自在に摺動し得る間隔とし、ボルト孔４に回
転軸ボルト５を挿入して拡幅翼３の脱着を自在と
なすリブ２の下端には突起部２ａを設け、ボルト
孔２ｂに止めボルト６を挿入して拡幅掘削時にお
ける拡幅翼３の下降を防止する。又拡幅調節孔４
ａを設けておき拡頭幅の増減に対処し得る如くな
す。 The structure of the above-mentioned pile head widening bit G is such that the widening blade 3 is fitted into the outer gallery steel pipe 1 and has a cutout 1a in the form so that the widening blade 3 is restrained from rising due to excavation and is free to descend. , is fixed to the rod tube B by ribs 2. The ribs 2 are provided on both sides of the widening blade 3, with a spacing that allows the widening blade 3 to freely slide up and down, and the lower end of the rib 2 allows the widening blade 3 to be freely attached and detached by inserting a rotating shaft bolt 5 into the bolt hole 4. A protrusion 2a is provided in the hole 2a, and a stop bolt 6 is inserted into the bolt hole 2b to prevent the widening wing 3 from lowering during widening excavation. Also, widening adjustment hole 4
A is provided so as to be able to cope with increases and decreases in the head expansion width.
拡幅翼３の外側下部には所要個の爪３ａを設け
て掘削を容易となし、内側に設けたボルト孔４に
よつて両側のリブ２に挟まれ回転軸ボルト５によ
つて上下摺動自在の構造となす。 A required number of pawls 3a are provided on the outer lower part of the widening blade 3 to facilitate excavation, and it is sandwiched between ribs 2 on both sides by a bolt hole 4 provided inside, and can freely slide up and down by a rotating shaft bolt 5. The structure of
従つてロツド管Ｂを回転駆動すれば先ず軸部掘
削ビツトＣによつて軸部径ｄの削孔がなされ、次
に所定の間隔をおいて杭頭拡幅ビツトＧによつて
拡頭掘削が同時に進行し杭頭拡幅ビツトＧが所定
の深度ｈに達した時点で、一旦ロツド管Ｂの回転
を中止してロツド管Ｂを吊り上げ、杭頭拡幅ビツ
トＧをスタンドパイプＡの上端まで引き上げ、リ
ブ２の２ｂに挿入してある止めボルト６を取り外
し、拡幅翼３を下降せしめて折り畳み、そのまま
ロツド管Ｂを吊り降ろして回転駆動を再開し、軸
部径ｄの掘削を完了して、杭頭拡幅杭を築造する
ものである。 Therefore, when the rod pipe B is driven to rotate, a hole with a shaft diameter d is first drilled by the shaft excavation bit C, and then, at a predetermined interval, the pile head widening bit G is used to simultaneously proceed with the head widening excavation. When the pile head widening bit G reaches a predetermined depth h, the rotation of the rod pipe B is temporarily stopped, the rod pipe B is lifted up, the pile head widening bit G is pulled up to the upper end of the stand pipe A, and the rib 2 is lifted up. 2b is removed, the widening wing 3 is lowered and folded, the rod pipe B is suspended and the rotational drive is resumed, and the excavation of the shaft diameter d is completed, and the pile head is widened. It is to build.
又軸部径ｄの掘削を完了した後、公知の拡底掘
削機を挿入して拡底掘削を行ない、拡頭拡底杭を
築造することができる。 Further, after completing the excavation of the shaft diameter d, a well-known bottom-expanding excavator is inserted to carry out bottom-expanding excavation, thereby making it possible to construct an expanded-head and bottom-expanding pile.
第４図に示すものは本発明施工法によつて築造
できる拡頭杭の一実施例を示すもので、同図ａは
拡頭部ｈ、軸部ｘ、拡底部ｙからなる拡頭拡底杭
を示すものであり、ｂは拡頭部長さｈ部分を２段
階とし、ｃはこれを更に３段階となしたもので、
何れも段付拡頭拡底杭を表し、前記施工順序によ
り容易に施工し得るものである。 Figure 4 shows an example of an expanded pile that can be constructed using the construction method of the present invention, and figure a shows an expanded head pile consisting of an expanded head h, an expanded shaft part x, and an expanded bottom part y. In b, the length h of the enlarged head part is divided into two stages, and in c, this is further divided into three stages,
All of these represent stepped expanded-head and expanded-bottom piles, which can be easily constructed using the above-mentioned construction order.
而して本発明によるときは、スタンドパイプＡ
は適宜の長さとし、杭頭部長ｈが長くなつても容
易に施工ができると共に、杭頭拡幅ビツトを取り
外す手間が省略され、それだけ施工時間が短縮さ
れることになり、又杭頭拡幅ビツトＧの外廊鋼管
１の外径をスタビライザーＥの外径と同径にする
ことにより、上下２個のスタビライザーにより削
孔の垂直精度を高めることにもなり、その上重錘
の役目を果たす等の多くの利点がある。
According to the present invention, the stand pipe A
is set to an appropriate length so that construction can be easily performed even if the pile head length h becomes long, and the effort to remove the pile head widening bit is omitted, which shortens the construction time accordingly. By making the outside diameter of the outer corridor steel pipe 1 of G the same as the outside diameter of the stabilizer E, the vertical accuracy of drilling is improved by the two upper and lower stabilizers, and in addition, it also serves as a weight. has many advantages.
第１図は本発明施工法の姿図、第２図は杭頭拡
幅装置の断面図、第３図は同平面図、第４図は本
発明施工法にて築造できる拡頭拡底杭の実施例図
である。
Ａ…スタンドパイプ、Ｂ…ロツド管、Ｃ…軸部
掘削ビツト、Ｄ…杭頭部径、ｄ…軸部径、Ｅ…ス
タビライザー、Ｆ…重錘、Ｇ…杭頭拡幅ビツト、
１…外廊鋼管、１ａ…型切込部、２…リブ、２ａ
…突起部、２ｂ…ボルト孔、３…拡幅翼、３ａ…
爪、４…ボルト孔、４ａ…拡幅調節孔、５…回転
軸ボルト、６…止めボルト、７…フランヂ。
Figure 1 is a diagram of the construction method of the present invention, Figure 2 is a cross-sectional view of the pile head widening device, Figure 3 is a plan view of the same, and Figure 4 is an example of an expanded head and bottom pile that can be constructed using the construction method of the present invention. It is a diagram. A... Stand pipe, B... Rod pipe, C... Shaft excavation bit, D... Pile head diameter, d... Shaft diameter, E... Stabilizer, F... Weight, G... Pile head widening bit,
1... Outer corridor steel pipe, 1a... Mold notch, 2... Rib, 2a
...protrusion, 2b...bolt hole, 3...widening wing, 3a...
Claw, 4... Bolt hole, 4a... Widening adjustment hole, 5... Rotating shaft bolt, 6... Stopping bolt, 7... Flange.
Claims (1)
に予め杭頭拡幅ビツトを取り付けて置き、ロツド
管の回転により、杭軸孔掘削の進行と同時に杭頭
拡幅掘削を行ない、杭頭拡幅掘削が所定の深度に
到達したら、一旦ロツド管の回転を停止し、ロツ
ド管を吊り上げ杭頭拡幅ビツトをスタンドパイプ
上端まで引き上げて、拡幅翼を折り畳み、そのま
まロツド管を吊り下ろし、杭軸孔掘削を継続して
杭頭拡幅段付杭を築造することを特徴とする場所
打杭に於ける杭頭拡幅段付杭の施工方法。 ２ 下端に掘削ビツトを固定したロツド管に、こ
のロツド管に設けた重錘の上部のロツド管の外周
に杭軸孔径より稍々小径の外廊鋼管を配設し、リ
ブを介して固定すると共にこの外廊鋼管の外周に
放射状に折り畳み可能で杭頭拡幅用の拡幅翼を多
数突設し、かつこの拡幅翼の両側を前記リブより
挟み、拡幅翼が上下自在に摺動し得る如く装着
し、拡幅掘削修了後拡幅翼を下降して折り畳み得
るようになしたることを特徴とする場所打杭に於
ける杭頭拡幅段付杭の施工装置。[Scope of Claims] 1 In the reverse construction method, a pile cap widening bit is attached in advance to the upper part of the pile shaft hole drilling device, and the pile cap widening excavation is carried out at the same time as the pile shaft hole excavation progresses by rotating the rod pipe. When the pile cap widening excavation reaches the specified depth, stop the rotation of the rod pipe, lift the rod pipe, pull up the pile cap widening bit to the top of the stand pipe, fold the widening wings, and hang the rod pipe as it is. A method for constructing a stepped pile with an expanded pile cap in a cast-in-place pile, which is characterized by continuing to excavate the pile shaft hole and constructing a stepped pile with an expanded pile cap. 2. A steel pipe with a slightly smaller diameter than the pile shaft hole is installed around the outer circumference of the rod pipe with a drilling bit fixed to the lower end of the rod pipe, above the weight attached to the rod pipe, and fixed through a rib. At the same time, a large number of widening wings that can be folded radially and are used to widen the pile head are protruded from the outer periphery of this outer corridor steel pipe, and both sides of the widening wings are sandwiched between the ribs, and the widening wings are installed so that they can freely slide up and down. A construction device for a stepped pile with a pile head for widening in a cast-in-place pile, characterized in that the widening wing can be lowered and folded after completion of widening excavation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22233983A JPS60115715A (en) | 1983-11-25 | 1983-11-25 | Method and apparatus for formation of expanded head and tiered pile for cast-in-place pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22233983A JPS60115715A (en) | 1983-11-25 | 1983-11-25 | Method and apparatus for formation of expanded head and tiered pile for cast-in-place pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60115715A JPS60115715A (en) | 1985-06-22 |
| JPS6334256B2 true JPS6334256B2 (en) | 1988-07-08 |
Family
ID=16780790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22233983A Granted JPS60115715A (en) | 1983-11-25 | 1983-11-25 | Method and apparatus for formation of expanded head and tiered pile for cast-in-place pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60115715A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02289718A (en) * | 1989-04-28 | 1990-11-29 | Mitani Sekisan Co Ltd | Drilling method of expanded head pile hole, constructing method of expanded head pile and pile hole drill |
| JP2004197321A (en) * | 2002-12-16 | 2004-07-15 | Traverse:Kk | Soil cement pile constructing method |
| JP6284119B2 (en) * | 2013-11-15 | 2018-02-28 | 三谷セキサン株式会社 | Excavation method for pile holes with expanded head |
-
1983
- 1983-11-25 JP JP22233983A patent/JPS60115715A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60115715A (en) | 1985-06-22 |
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