JPH0114375B2 - - Google Patents
Info
- Publication number
- JPH0114375B2 JPH0114375B2 JP58199843A JP19984383A JPH0114375B2 JP H0114375 B2 JPH0114375 B2 JP H0114375B2 JP 58199843 A JP58199843 A JP 58199843A JP 19984383 A JP19984383 A JP 19984383A JP H0114375 B2 JPH0114375 B2 JP H0114375B2
- Authority
- JP
- Japan
- Prior art keywords
- casing
- water
- sand
- permeable
- permeable cylinder
- 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
- 239000004576 sand Substances 0.000 claims description 17
- 238000010276 construction Methods 0.000 claims description 5
- 239000004927 clay Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
- E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【発明の詳細な説明】
（発明が属する技術分野）
本発明は所要部分が透水性筒体で被覆されてい
るサンドドレーン杭を造成する工法に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a construction method for constructing a sand drain pile in which required portions are covered with a water-permeable cylindrical body.
（発明の課題とその特徴点）
軟弱地盤中に所要部分（特に軟弱な粘土、シル
ト等の層の部分）が透水性筒体で被覆されている
サンドドレーン杭を造成する場合に、ケーシング
内の所定位置に短尺で漏斗状の案内管を固着し、
ケーシングの下端から吊上げた所定長の透水性筒
体の上端開口をケーシングの内周と案内管の外周
との間の環状間隙にはめて、透水性筒体をケーシ
ング内の所定位置にセツトする技術は、本出願人
により先に提案されている（特開昭58−69920号
公報参照）。(Problem to be solved by the invention and its features) When constructing a sand drain pile in soft ground where the required part (particularly the part of the layer of soft clay, silt, etc.) is covered with a water-permeable cylindrical body, it is necessary to Fix a short funnel-shaped guide tube in place,
A technique in which the upper end opening of a water-permeable cylinder of a predetermined length suspended from the lower end of the casing is fitted into an annular gap between the inner periphery of the casing and the outer periphery of the guide tube, and the water-permeable cylinder is set at a predetermined position within the casing. was previously proposed by the present applicant (see Japanese Patent Application Laid-Open No. 58-69920).
この先行技術には、透水性筒体をケーシング内
の所定位置に容易かつ確実にセツトできる、透水
性筒体がケーシング内のどの位置にあつても砂を
正確に入れることができる、等の利点があるが、
このものの難点は部分被覆の位置が変わる度に案
内管の固着位置を変える必要があることである。 This prior art has advantages such as being able to easily and reliably set the permeable cylinder in a predetermined position within the casing, and allowing accurate filling of sand no matter where the permeable cylinder is located within the casing. There is, but
The disadvantage of this is that it is necessary to change the position of the guide tube each time the position of the partial cover changes.
本願発明は、前記難点を伴わない新規の部分被
覆サンドドレーン杭造成工法を提供することを目
的としているものであつて、その構成上の特徴は
特許請求の範囲に記載したとおりである。 The present invention aims to provide a new partially covered sand drain pile construction method that does not have the above-mentioned difficulties, and its structural features are as described in the claims.
（図面による発明の具体的説明）
本発明実施用装置を例示した第１図において、
１は鋼管からなるケーシング、２はケーシング１
の上端に装着した貫入機、３はその付近に設けた
砂供給用のホツパ、４はケーシング１の下端に取
付けた蓋体であり、これらの全体は図示しない施
工機本体にワイヤ５で上下動自在に懸吊されてい
る。(Specific Description of the Invention with Drawings) In FIG. 1 illustrating the apparatus for implementing the present invention,
1 is a casing made of steel pipe, 2 is a casing 1
A penetrating machine is attached to the upper end, 3 is a hopper for sand supply provided near the hopper, and 4 is a lid body attached to the lower end of the casing 1. All of these are connected to the construction machine body (not shown) by a wire 5 for vertical movement. It is freely suspended.
６はケーシング１の上部内壁に適宜手段で固着
された短尺で漏斗状の案内管であり、この案内管
６の下端には伸縮自在の蛇腹管７が接続され、自
重等でケーシング１の下端近くまで垂下している
この蛇腹管７の下端にはワイヤ８が取付けられて
いる。 Reference numeral 6 denotes a short, funnel-shaped guide tube fixed to the upper inner wall of the casing 1 by appropriate means, and a telescopic bellows tube 7 is connected to the lower end of the guide tube 6, so that the guide tube 6 is attached near the lower end of the casing 1 due to its own weight, etc. A wire 8 is attached to the lower end of the bellows tube 7, which hangs down to the lower end.
第２図は本発明説明用の工程図であり、図中、
イは軟弱地盤全体、ロは比較的拘束力がある粘土
の層、ハは拘束力が弱い粘土、シルト等の層を示
している。 FIG. 2 is a process diagram for explaining the present invention, and in the figure,
A shows the entire soft ground, b shows a layer of clay that has a relatively binding force, and c shows a layer of clay, silt, etc. that has a relatively weak binding force.
本発明では、まず、第１図に示す装置を地表近
くまで下げ、蛇腹管７の下端に所定長さの透水性
筒体９の上端を着脱自在に連結し（状態Ａ）、つ
いで、ワイヤ８で透水性筒体９を吊上げ、ケーシ
ング１内の所定位置にセツトする（状態Ｂ）。図
の場合の透水性筒体９は、層ハの厚さ相当分より
も若干長く、ケーシング１内の層ハに相当する位
置にセツトされている。 In the present invention, first, the device shown in FIG. The water-permeable cylindrical body 9 is lifted up and set at a predetermined position inside the casing 1 (state B). In the case shown in the figure, the water-permeable cylinder 9 is slightly longer than the thickness of layer C, and is set in the casing 1 at a position corresponding to layer C.
その後、蓋４を閉じ、ホツパ３からケーシング
１内に砂１０を投入・充填し（状態Ｃ）、ケーシ
ング１を軟弱地盤イ中に貫入するが（状態Ｄ）、
砂１０の投下・充填はケーシング１の貫入の途中
でもよい。 After that, the lid 4 is closed, and the casing 1 is filled with sand 10 from the hopper 3 (state C), and the casing 1 is penetrated into the soft ground (state D).
The sand 10 may be dropped and filled during the penetration of the casing 1.
ケーシング１の下端が軟弱地盤イの下端に到達
した後、ケーシング１を引抜きながら、その下端
から砂１０を排出させて、順次上方に向かつて砂
杭を造成してゆく。この際、層ロの所では砂のみ
を排出させ、層ハの所では砂と共に透水性筒体９
を排出させて、状態Ｅに示すように透水性筒体９
の上下端部が層ハに隣接する層ロ内に根入れされ
ている部分被覆のサイドドレーン杭を造成する。
なお、透水性筒体９の排出の際には透水性筒体９
を蛇腹管７から外す必要があるので、蛇腹管７と
透水性筒体９の連結は例えばワイヤ８を若干緩め
れば簡単に外れるようにしておくのが望ましい。 After the lower end of the casing 1 reaches the lower end of the soft ground A, the sand 10 is discharged from the lower end while pulling out the casing 1, and the sand pile is successively moved upward. At this time, only the sand is discharged from the layer B, and the water-permeable cylinder 9 is discharged together with the sand from the layer C.
is discharged, and as shown in state E, the water permeable cylindrical body 9
Construct partially covered side drain piles whose upper and lower ends are embedded in layer B adjacent to layer C.
Note that when discharging the water-permeable cylinder 9, the water-permeable cylinder 9
Since it is necessary to remove the bellows tube 7 from the bellows tube 7, it is desirable that the connection between the bellows tube 7 and the water-permeable cylindrical body 9 be such that it can be easily removed by loosening the wire 8 slightly, for example.
（発明の効果）
本発明工法は以上のようなものであるから、前
述の先行技術のように部分被覆の位置が変わつて
も案内管の位置を変える必要がなく、案内管と蛇
腹管を通して砂の投下・充填を正確に行うことが
でき、また、案内管をケーシング内に吊下げてこ
れに直接、透水性筒体を連結する場合のように、
案内管がケーシング内で傾いたり、案内管とケー
シングの接触部に砂が入つたりして、透水性筒体
の吊上げ操作等が阻害されるおそれもなく、部分
被覆サイドドレーン杭の造成を円滑に行うことが
できる。(Effects of the Invention) Since the construction method of the present invention is as described above, there is no need to change the position of the guide pipe even if the position of the partial coating changes as in the prior art described above, and sand can be transported through the guide pipe and the bellows pipe. In addition, as in the case where the guide pipe is suspended inside the casing and a water-permeable cylinder is directly connected to it,
Partially covered side drain piles can be built smoothly without the risk of the guide pipe tilting within the casing or sand entering the contact area between the guide pipe and casing, which will impede lifting operations of the permeable cylinder. can be done.
第１図は本発明実施用装置の概略図、第２図は
本発明の一実施態様の説明図である。
図中、１：ケーシング、６：案内管、７：蛇腹
管、９：透水性筒体、……。
FIG. 1 is a schematic diagram of an apparatus for implementing the present invention, and FIG. 2 is an explanatory diagram of one embodiment of the present invention. In the figure, 1: casing, 6: guide tube, 7: bellows tube, 9: water permeable cylinder, ...
Claims (1)
状の案内管に蛇腹管を接続して垂下させ、地上に
おいて、ケーシングの下端まで延びた蛇腹管に所
定長の透水性筒体を連結してから、蛇腹管の下端
を吊上げて、透水性筒体をケーシング内の所定位
置にセツトした後、ケーシングを軟弱地盤中に所
定深度まで貫入し、この間の適当な段階でケーシ
ング内に砂を投入・充填し、その後、ケーシング
を引抜きつつケーシングの下端から、透水性筒体
による被覆を必要としない所では砂のみを、透水
性筒体による被覆を必要とする所では砂と共に透
水性筒体を、それぞれ排出させることを特徴とす
る部分被覆サンドドレーン杭造成工法。1. Connect a bellows pipe to a short funnel-shaped guide pipe fixed to the upper inner wall of the casing and let it hang down. On the ground, connect a water-permeable cylindrical body of a predetermined length to the bellows pipe that extends to the lower end of the casing. After lifting the lower end of the bellows pipe and setting the permeable cylindrical body at a predetermined position inside the casing, the casing is penetrated into the soft ground to a predetermined depth, and sand is poured into the casing at an appropriate stage during this time to fill it. Then, while pulling out the casing, only the sand is discharged from the lower end of the casing in areas that do not require covering with a water-permeable cylinder, and in areas that require covering with a water-permeable cylinder, the water-permeable cylinder is discharged along with the sand. Partially covered sand drain pile construction method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19984383A JPS6092511A (en) | 1983-10-25 | 1983-10-25 | Formation work of partly covered sand drain pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19984383A JPS6092511A (en) | 1983-10-25 | 1983-10-25 | Formation work of partly covered sand drain pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6092511A JPS6092511A (en) | 1985-05-24 |
| JPH0114375B2 true JPH0114375B2 (en) | 1989-03-10 |
Family
ID=16414568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19984383A Granted JPS6092511A (en) | 1983-10-25 | 1983-10-25 | Formation work of partly covered sand drain pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6092511A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57116824A (en) * | 1981-01-08 | 1982-07-21 | Fudo Constr Co Ltd | Sand drain and its formation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5934604Y2 (en) * | 1980-12-20 | 1984-09-25 | 東洋建設株式会社 | Sand supply device to net bag for sand pile |
-
1983
- 1983-10-25 JP JP19984383A patent/JPS6092511A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57116824A (en) * | 1981-01-08 | 1982-07-21 | Fudo Constr Co Ltd | Sand drain and its formation |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6092511A (en) | 1985-05-24 |
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