JPS6334255B2 - - Google Patents
Info
- Publication number
- JPS6334255B2 JPS6334255B2 JP58016810A JP1681083A JPS6334255B2 JP S6334255 B2 JPS6334255 B2 JP S6334255B2 JP 58016810 A JP58016810 A JP 58016810A JP 1681083 A JP1681083 A JP 1681083A JP S6334255 B2 JPS6334255 B2 JP S6334255B2
- Authority
- JP
- Japan
- Prior art keywords
- hole
- steel pipe
- bentonite
- aqueous solution
- concrete
- 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 40
- 239000010959 steel Substances 0.000 claims description 40
- 229910000278 bentonite Inorganic materials 0.000 claims description 32
- 239000000440 bentonite Substances 0.000 claims description 32
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 32
- 239000007864 aqueous solution Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims 1
- 238000005553 drilling Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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)
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】
本発明は、中空場所打杭の施工方法に関し、特
に中空部形成のための鋼管を容易に抜き出せるよ
うにしてその施工を可能とするとともに作業性を
向上したものである。[Detailed Description of the Invention] The present invention relates to a method for constructing hollow cast-in-place piles, and in particular, a method that enables the steel pipe for forming the hollow portion to be easily extracted, thereby making the construction possible and improving workability. be.
場所打ちコンクリート杭を施工する場合、杭底
部の地盤支持力に対し、杭本体の強度が過剰であ
るという問題があつた。このため杭底部を拡大し
たり、中空杭とするなどの工夫が考えられてい
る。 When constructing cast-in-place concrete piles, there is a problem in that the strength of the pile itself is excessive compared to the ground bearing capacity of the bottom of the pile. For this reason, ideas such as enlarging the bottom of the pile or making it hollow are being considered.
本発明は、杭中空部を形成するために穴内にベ
ントナイトを電気付着させた鋼管型枠を挿入し、
コンクリート硬化後、その鋼管型枠を容易に引抜
けるようにして、作業性よく中空場所打杭を施工
できるようにすることを目的とする。 The present invention involves inserting a steel pipe formwork with bentonite electrolytically deposited into the hole to form a pile hollow part,
The purpose is to make it possible to easily pull out the steel pipe formwork after concrete has hardened, and to construct hollow cast-in-place piles with good workability.
次に図面により本発明の中空場所打杭の施工方
法を説明する。中空場所打杭を施工すべき地盤位
置に、穴１を掘削し、該穴１内に安定液としての
ベントナイト水溶液２を入れて穴内壁がくずれな
いようにしつつ、掘進して所定深さの穴を掘削す
る。 Next, the construction method of the hollow cast-in-place pile of the present invention will be explained with reference to the drawings. A hole 1 is excavated in the ground location where the hollow cast-in-place pile is to be constructed, and a bentonite aqueous solution 2 is poured into the hole 1 as a stabilizing liquid to prevent the inner wall of the hole from collapsing, and the hole is dug to a predetermined depth. excavate.
中空場所打杭の中空部を形成する大きさの鋼管
３は、下端が閉鎖されて下部に孔４を有し、鋼管
外周面に前もつてベントナイト５を電気付着して
おく。この電気付着法は、ベントナイト水溶液槽
内に鋼管３を入れ、ベントナイト槽と鋼管３との
間に付着対象表面１m2につき電流密度40〜150ア
ンペア／m2、電圧20〜40Vの電流を流して行うも
のである。なおこの場合のベントナイト水溶液の
濃度は、水の重量に対するベントナイトの乾燥重
量比が20〜40％のものを使用し、鋼管へのベント
ナイトの付着強度を強くする。また鋼管３以外の
導電材料を使用して、中空場所打杭の中空部を形
成してもよく、さらにベントナイト槽を使用する
ことなく、ノズル等で鋼管にベントナイト水溶液
を吹出し、ノズルと鋼管との間に電流を流すよう
にして付着させてもよい。 A steel pipe 3 having a size to form the hollow part of a hollow cast-in-place pile is closed at the lower end and has a hole 4 in the lower part, and bentonite 5 is electrically deposited on the outer peripheral surface of the steel pipe in advance. In this electrodeposition method, a steel pipe 3 is placed in a bentonite aqueous solution bath, and a current with a current density of 40 to 150 ampere/m 2 and a voltage of 20 to 40 V is passed per 1 m 2 of the surface to be adhered between the bentonite bath and the steel tube 3 . It is something to do. In this case, the concentration of the bentonite aqueous solution is such that the dry weight ratio of bentonite to the weight of water is 20 to 40% to strengthen the adhesion strength of bentonite to the steel pipe. Further, the hollow part of the hollow cast-in-place pile may be formed using a conductive material other than the steel pipe 3. Furthermore, without using a bentonite tank, an aqueous bentonite solution is blown onto the steel pipe with a nozzle or the like, and the connection between the nozzle and the steel pipe is They may be attached by passing an electric current between them.
このようにベントナイトを付着した鋼管をクレ
ーン等に吊り下げて、穴１内におろす。鋼管３を
おろすにつれ、穴内のベントナイト水溶液は孔４
から鋼管の中空部に入り、その下降に支障はな
い。そして鋼管３を穴内の中央部に吊り下げた状
態に保持する。あるいは地盤面に固定台を設けて
保持する。 The steel pipe with bentonite adhered to it in this way is suspended from a crane or the like and lowered into the hole 1. As the steel pipe 3 is lowered, the bentonite aqueous solution in the hole flows into the hole 4.
It enters the hollow part of the steel pipe, and there is no problem with its descent. The steel pipe 3 is then held suspended in the center of the hole. Alternatively, install a fixed stand on the ground to hold it.
次に穴１の内壁面と鋼管３の外周面との間に鉄
筋かご６を配置し、トレミー管７を穴１の底部近
くまでおろす。トレミー管７はコンクリート供給
装置に連通され、供給装置の駆動によりトレミー
管の下端からコンクリートを流出して、穴の下端
から順次上方へコンクリートを打設し、同時に穴
の上方からベントナイト水溶液をポンプ８により
吸い上げる。この作業を続けることにより穴の上
端までコンクリートを打設することができる。 Next, a reinforcing bar cage 6 is placed between the inner wall surface of the hole 1 and the outer peripheral surface of the steel pipe 3, and the tremie tube 7 is lowered to near the bottom of the hole 1. The tremie pipe 7 is communicated with a concrete supply device, and when the supply device is driven, concrete flows out from the lower end of the tremie pipe, and concrete is sequentially poured upward from the lower end of the hole. At the same time, a bentonite aqueous solution is pumped 8 from above the hole. suck it up. By continuing this process, concrete can be poured to the top of the hole.
上記の打設コンクリートが硬化した後、鋼管３
をクレーン、油圧引抜機等で引抜けば中空場所打
杭が完成する。このように鋼管３を引抜く場合、
鋼管外周にベントナイトが電気付着しているの
で、鋼管とコンクリートとの間の摩擦は小さく、
容易に引抜くことができる。 After the concrete poured above has hardened, the steel pipe 3
When pulled out using a crane, hydraulic puller, etc., a hollow cast-in-place pile is completed. When pulling out the steel pipe 3 in this way,
Since bentonite is electrically attached to the outer circumference of the steel pipe, the friction between the steel pipe and concrete is small.
Can be easily pulled out.
なお、以上において鋼管３は穴内に入れる前に
ベントナイトを鋼管外周面に付着したが、穴１内
にベントナイト溶液が入つているので、鋼管３を
穴内に入れた後、穴内に入れた鉄筋６と鋼管３と
の間に電流を流して鋼管にベントナイトを電気付
着するようにしてもよい。この場合、鋼管にベン
トナイトを別工程で付着する作業を省略できる。 In the above, bentonite was attached to the outer circumferential surface of the steel pipe 3 before it was put into the hole, but since the bentonite solution is in the hole 1, after the steel pipe 3 was put into the hole, it was attached to the reinforcing bar 6 that was put in the hole. Bentonite may be electrically deposited on the steel pipe by passing an electric current between the bentonite and the steel pipe 3. In this case, the work of attaching bentonite to the steel pipe in a separate process can be omitted.
鋼管の下部の孔４は、小さいものでよいが、１
個に限るものではなく、複数設けてもよい。 The hole 4 at the bottom of the steel pipe may be small, but 1
The number is not limited to one, but a plurality may be provided.
本発明によれば、中空杭を成形する鋼管の下端
が閉鎖されているので、中空杭の下端部を、一定
形状に、高精度高品質に、確実に、しかも何等の
補助部材を要することなく成形でき、かつ力学的
に保証される安全なものにでき、また、下端が閉
鎖されていても、掘削穴内への挿入時には、下部
に小さな孔があるので、穴内のベントナイト水溶
液を孔から導入できて、挿入に支障を生ぜず、挿
入後には、その位置を安定に保持でき、したがつ
て、掘削穴の穴壁を安定させるべくベントナイト
水溶液を使用しても、これが障害となることはな
い。 According to the present invention, since the lower end of the steel pipe forming the hollow pile is closed, the lower end of the hollow pile can be formed into a constant shape with high precision and high quality, without requiring any auxiliary members. It can be molded and mechanically guaranteed to be safe, and even if the lower end is closed, there is a small hole at the bottom when inserted into the drilled hole, so the bentonite aqueous solution inside the hole can be introduced through the hole. Therefore, there is no problem with insertion and the position can be stably maintained after insertion, so even if a bentonite aqueous solution is used to stabilize the wall of an excavated hole, this will not be a hindrance.
鋼管の挿入後、鋼管の周りにコンクリートが打
設されるが、この際には、その下部の孔が小さい
のでコンクリート骨材によるアーチング現象が生
じること及び鋼管内のベントナイト水溶液による
水圧が作用することから、鋼管には、孔を通じて
コンクリートがほとんど流入せず、孔が固く塞が
つてしまうことはない。 After the steel pipe is inserted, concrete is placed around the steel pipe, but at this time, since the holes at the bottom are small, arching occurs due to the concrete aggregate, and water pressure from the bentonite aqueous solution inside the steel pipe acts. Therefore, almost no concrete flows into the steel pipe through the holes, and the holes do not become tightly blocked.
而して、鋼管は、打設コンクリートの硬化後、
引抜かれることとなるが、鋼管には、外周面にベ
ントナイトが電気付着されているので、容易に引
抜くことができ、勿論、この際には、鋼管の下端
が閉鎖されていても下部の孔により鋼管と中空杭
との間にベントナイト水溶液や空気が流入するた
め真空による引抜き抵抗が生ぜず、中空場所打杭
を作業性よく施工できる。また杭は中空である
が、杭としての強度は有効に作用し、しかも中空
部分だけコンクリート材料の節約となる。さらに
鋼管へのベントナイト付着を、掘削穴内で電気付
着すれば、別個にベントナイト付着する作業は不
要となり、都合がよい。 Therefore, after the hardening of the poured concrete, the steel pipe is
However, since bentonite is electrolytically deposited on the outer circumferential surface of the steel pipe, it can be easily pulled out. This allows bentonite aqueous solution and air to flow between the steel pipe and the hollow pile, so there is no pull-out resistance due to vacuum, and hollow cast-in-place piles can be constructed with good workability. Furthermore, although the piles are hollow, their strength as piles is effective, and moreover, concrete material can be saved in the hollow portions. Furthermore, if bentonite is attached to the steel pipe by electro-deposition within the excavated hole, there is no need to separately attach bentonite, which is convenient.
図面は本発明の施工方法による中空場所打杭の
側断面図である。
１…穴、２…ベントナイト水溶液、３…鋼管、
５…ベントナイト。
The drawing is a side sectional view of a hollow cast-in-place pile according to the construction method of the present invention. 1... Hole, 2... Bentonite aqueous solution, 3... Steel pipe,
5...Bentonite.
Claims (1)
水溶液を入れる工程と、掘削穴内に鉄筋かごを挿
入する工程と、その後穴内へ、下端部に小さな孔
を有する鋼管を、該鋼管の外周にベントナイトを
電気付着して、かつ孔から穴内のベントナイト水
溶液を導入しつつ挿入する工程と、鋼管外周面と
穴内壁面との間に下から順次上方へコンクリート
を打設しながらその鋼管外周面と穴内壁面との間
の上記ベントナイト水溶液を排出する工程と、コ
ンクリート硬化後、鋼管を上方に引抜く工程とか
らなる中空場所打杭の施工方法。1 A step of drilling a hole in the ground and pouring a bentonite aqueous solution into the hole, a step of inserting a rebar cage into the excavated hole, and then inserting a steel pipe with a small hole at the lower end into the hole and adding bentonite around the outer periphery of the steel pipe. A process of electrically adhering and inserting the bentonite aqueous solution in the hole through the hole, and pouring concrete between the outer circumferential surface of the steel pipe and the inner wall surface of the hole from the bottom up sequentially. A method for constructing hollow cast-in-place piles, which comprises a step of discharging the bentonite aqueous solution during the curing step, and a step of pulling the steel pipe upward after the concrete hardens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1681083A JPS59141627A (en) | 1983-02-03 | 1983-02-03 | Construction of on-site hollow pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1681083A JPS59141627A (en) | 1983-02-03 | 1983-02-03 | Construction of on-site hollow pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59141627A JPS59141627A (en) | 1984-08-14 |
| JPS6334255B2 true JPS6334255B2 (en) | 1988-07-08 |
Family
ID=11926507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1681083A Granted JPS59141627A (en) | 1983-02-03 | 1983-02-03 | Construction of on-site hollow pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59141627A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01102125A (en) * | 1987-10-15 | 1989-04-19 | Kubota Ltd | Placement of concrete pile at site |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5141763A (en) * | 1974-10-08 | 1976-04-08 | Fuji Photo Film Co Ltd | |
| JPS5598525A (en) * | 1979-01-19 | 1980-07-26 | Tousen Concrete Kogyo Kk | Hollow piling method for cast-in-place concrete |
-
1983
- 1983-02-03 JP JP1681083A patent/JPS59141627A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5141763A (en) * | 1974-10-08 | 1976-04-08 | Fuji Photo Film Co Ltd | |
| JPS5598525A (en) * | 1979-01-19 | 1980-07-26 | Tousen Concrete Kogyo Kk | Hollow piling method for cast-in-place concrete |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59141627A (en) | 1984-08-14 |
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