JPS5847817A - Improved pile formation work for soft ground under water - Google Patents

Improved pile formation work for soft ground under water

Info

Publication number
JPS5847817A
JPS5847817A JP14627281A JP14627281A JPS5847817A JP S5847817 A JPS5847817 A JP S5847817A JP 14627281 A JP14627281 A JP 14627281A JP 14627281 A JP14627281 A JP 14627281A JP S5847817 A JPS5847817 A JP S5847817A
Authority
JP
Japan
Prior art keywords
casing
sand
water
bag
column
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
Application number
JP14627281A
Other languages
Japanese (ja)
Other versions
JPS6251325B2 (en
Inventor
Makoto Hirose
誠 広瀬
Tetsuzo Iwatsuki
哲三 岩月
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toa Corp
Original Assignee
Toa Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toa Corp filed Critical Toa Corp
Priority to JP14627281A priority Critical patent/JPS5847817A/en
Publication of JPS5847817A publication Critical patent/JPS5847817A/en
Publication of JPS6251325B2 publication Critical patent/JPS6251325B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

PURPOSE:To form sand bag pillars as improved piles in soft ground by a method in which balloons provided at the tip of a sand bag pillar are closely contacted with the inner wall of a casing to let it work as piston and water inside the casing is utilized as a damper for the sand bag pillar. CONSTITUTION:A casing 1 is driven into soft ground under water and then an elastic balloon 15 filled with a fluid is inserted into the casing 1. Then, natural wet sand S is supplied from a sand supply tube 10 with a hopper and packed into a sand bag 9' in a guide cylinder 11 and then a stopper 12 is drawn out, whereupon the sand bag 9' drops by gravity into the casing 1 and reaches the upside of the balloon 15. At this time, the packing of sand into the sand bag 9' is continued and pressures of the sand bag pillar are applied to water W in the casing 1 through the balloon 15. By pressures to water W and the auxiliary suction of a drain pump 19, water W is drained through a drain pipe 18 to the outside of the casing 1. The settling speed of the sand bag pillar is adjusted by the supply speed of sand S and the opening degree of the drain valve 20. After the sand bag pillar reaches the bottom, the balloon 15 is crushed by a needle, etc., and the casing 1 and a bottom plug 2 are pulled up.

Description

【発明の詳細な説明】 本発明は、水底の軟弱地盤中に改良杭を造成する工法に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for constructing improved piles in soft ground at the bottom of water.

従来、海や河川、湖沼等の水底の軟弱な地盤を改良する
ために、軟弱地盤中に改良杭を造成する工法は、すてに
二、三提案されている。すなわち、次のような工法が知
られている。
Conventionally, in order to improve the soft ground at the bottom of the sea, rivers, lakes, etc., a few construction methods have been proposed for constructing improvement piles in the soft ground. That is, the following construction methods are known.

(1)  軟弱地盤に打込んだケーシング内で、砂袋内
の砂を積極的に加水しながら湿潤させ、高密度に固く締
まった砂袋柱を形成したうえで、ケーシング底部にまで
沈降させてから、ケーシングのみを抜去る工法(以下、
水締め工法と呼ぶ)−たとえば、特公昭53−1660
4号公報、特公昭54−20243号公報に記載のもの
など。
(1) Inside a casing that is driven into soft ground, the sand in the sand bag is actively added water to moisten it, form a dense and tightly packed sand bag column, and then let it settle to the bottom of the casing. A construction method in which only the casing is removed from the
(referred to as water tightening method) - For example, Special Publication No. 53-1660
4, and those described in Japanese Patent Publication No. 54-20243.

(2ケーシングを水底軟弱地盤に打込んだ後、ケーシン
グ内に浸入して残存してい名水を完全に排出せしめてか
ら、その無水状態のケーシング内に砂袋または生石灰を
主体とする地盤強化剤袋を投入して落下せしめ、ケーシ
ングのみを抜去る工法(以下、無水工法と呼ぶ)−たと
えば、特公昭55−11177号公報または特公昭56
−570号公報に記載のものなど。
(2) After driving the casing into the soft ground, after completely draining the water that has penetrated into the casing and remaining, place a sand bag or a soil strengthening agent bag mainly made of quicklime inside the anhydrous casing. A construction method in which only the casing is removed by dropping the casing (hereinafter referred to as anhydrous construction method) - for example, Japanese Patent Publication No. 55-11177 or Japanese Patent Publication No. 56
-Those described in Publication No. 570, etc.

しかし−ながら、このような従来工法には、いずれも次
のような問題点ないし欠点があった。
However, all of these conventional construction methods have the following problems or drawbacks.

(1)の水締め工法においては、砂袋内の砂を密に水締
めした砂袋柱を用いるため、固くなりすぎて流動性、柔
軟性が失われ、水底軟弱地盤の変動に対して追従し難い
恐れがある、という問題があった。
In the water-tightening method (1), sand-bag pillars are used in which the sand inside the sand-bags is tightly water-tightened, so they become too hard and lose their fluidity and flexibility, making them difficult to follow the fluctuations of the soft ground at the bottom of the water. There was a problem that it might be difficult to do so.

また、水締めして高密度の砂袋柱にするため、自然湿潤
状態の砂をそのまま使う工法に比べて余分の砂が必要で
あり、材料コストの面でも好ましくなかった。
In addition, because the sand is compacted to form a high-density sand bag pillar, extra sand is required compared to a construction method that uses sand in a naturally moist state, which is not desirable in terms of material cost.

(のの無水工法においては、第一に、ケーシング内に浸
入した水を完全に排出することが技術的に困難であり、
できたとしても多大な労力と余分な装置を要するもので
あった。第二に、ケーシング内に浸入した水を砂袋等の
沈降時にダシパーとして利用することなく排出してしま
うため、砂袋等の自重が大きくなり、ケーシング内で砂
袋等が切れてしまう恐れがあった。
(With Nono's waterless construction method, firstly, it is technically difficult to completely drain the water that has entered the casing.
Even if it were possible, it would require a great deal of labor and extra equipment. Second, since the water that has entered the casing is discharged without being used as a dumper when the sandbag, etc. settles, the weight of the sandbag, etc. increases, and there is a risk that the sandbag, etc. may break inside the casing. there were.

本発明の目的は、上記従来の水締め工法および無水工法
の欠点をともに克服し、ケーシング内に入れた砂袋内の
砂等に注水することなく、またケーシング内に浸入して
残存している水を予め排水することもなく、そのケーシ
ング内の水を砂袋柱等の沈降時にダンパーとして利用し
ながら施工性よく、かつ自然湿潤砂等をそのまま用いて
経済性よく、水底の軟弱地盤に改良杭を造成することの
できる、改善された工法魁提供することにある。
The purpose of the present invention is to overcome both the drawbacks of the conventional water tightening method and anhydrous method described above, and to eliminate the need to pour water into the sand, etc. in the sand bag placed in the casing, and to eliminate water from entering the casing and remaining there. There is no need to drain the water in advance, and the water inside the casing is used as a damper when the sandbag pillars settle, making it easy to construct and economically improving the soft ground at the bottom of the water by using naturally moist sand as it is. The object of the present invention is to provide an improved construction method for constructing piles.

この目的を達成するため、本第−発明は、水底軟弱地盤
中に改良杭を造成する際、該水底軟弱地盤にケーシング
を打込んだ後、該ケーシング内に流体入りの可撓性袋状
体を挿入し、該可撓性袋状体の上から砂を充填した有底
円筒状の袋をケーシング内に投入して、可撓性袋状体を
先端とする砂袋柱を形成せしめ、該砂袋柱を、ケーシン
グ内の可撓性袋状体よりも下面にある水を排出せしめな
からケーシング底部まで沈降せしめ、該砂袋柱を水底軟
弱地盤中に残して、ケーシングのみを抜去ること−を特
徴とするものであり、 本第二発明は、 水底軟弱地盤中に改良杭を造成する際、該水底軟弱地盤
にケーシングを打込んだ後、該ケーシング内に流体入り
の可撓性袋状体を挿入し、該可撓性袋状体の上から地盤
強化剤を充填した有底円筒状の袋をケーシング内に投入
して、可撓性袋状体を先端とする地盤強化剤袋柱を形成
せしめ、該地盤強化゛剤袋柱を、ケーシング内の可撓性
袋状体よりも下面にある水を排出せしめなからケーシン
グ底部まで沈降せしめ、該地盤強化剤袋柱を水底軟弱地
盤中に残して、ケーシングのみを抜去ることを特徴とす
るものであり、本第三発明は、 水底軟弱1地盤中に改良杭を造成する際、該水底軟弱地
盤にケーシングを打込んだ後、該ケーシング内に流体入
りの可撓性袋状体を挿入し、該可撓性袋状体の上から砂
を直接ケーシング内に充填して、可撓性袋状体を先端と
する砂柱を形成せしめ、該砂柱を、ケーシング内の可撓
性袋状体よりも下面にある水を排出せしめなからケーシ
ング底部まで沈降せしめ、該砂柱を水底軟弱地盤中に残
して、ケーシングのみを抜去ることを特徴とするもので
あり、 および、本第四発明は、 水底軟弱地盤中に改良杭を造成する際、該水底軟弱地盤
にケーシングを打込んだ後、該ケーシング内に流体入り
の可撓性袋状体を挿入し、該可撓性袋状体の上から地盤
強化剤を直接ケーシング内に充填して、可撓性袋状体を
先端とする地盤強化剤柱を形成せしめ、該地盤強化剤柱
を、ケーシング内の可撓性袋状体よりも下面にある水を
排出せしめながらケーシング底部まで沈降せしめ、該地
盤強化剤柱を水底軟弱地盤中に残して、ケーシングのみ
を抜去ることを特徴とするものである。
In order to achieve this object, the present invention provides a structure in which, when constructing an improved pile in soft ground with a water bottom, after driving a casing into the soft ground with a water bottom, a flexible bag-like body containing fluid is inserted into the casing. A bottomed cylindrical bag filled with sand is put into the casing from above the flexible bag-like body to form a sand bag pillar with the flexible bag-like body at the tip. Allowing the sandbag column to sink to the bottom of the casing without draining the water below the flexible bag-like body in the casing, and removing only the casing while leaving the sandbag column in the soft ground at the bottom of the water. - The second invention is characterized in that, when constructing an improved pile in soft ground with a water bottom, after driving a casing into the soft ground with a water bottom, a flexible bag containing fluid is inserted into the casing. A cylindrical bag with a bottom and filled with a soil strengthening agent is inserted into the casing from above the flexible bag-like body to produce a soil-strengthening agent bag with the flexible bag-like body at the tip. Forming a column, the soil strengthening agent bag column is allowed to sink to the bottom of the casing without draining water below the flexible bag-like body in the casing, and the soil strengthening agent bag column is attached to a soft water-bottomed ground. The third invention is characterized in that when an improved pile is constructed in soft underwater ground 1, after driving the casing into the soft underwater ground, A flexible bag-like body filled with fluid is inserted into the casing, and sand is directly filled into the casing from above the flexible bag-like body to form a sand column with the flexible bag-like body at the tip. The sand column is allowed to settle to the bottom of the casing without draining the water below the flexible bag-like body in the casing, and only the casing is removed, leaving the sand column in the soft ground at the bottom of the water. The fourth invention is characterized in that, when constructing an improved pile in soft ground with a water bottom, after driving a casing into the soft ground with a water bottom, it is possible for fluid to enter the casing. A flexible bag-like body is inserted, and a soil strengthening agent is directly filled into the casing from above the flexible bag-like body to form a soil-strengthening agent column with the flexible bag-like body at the tip. The soil reinforcement column is allowed to sink to the bottom of the casing while draining water below the flexible bag-like body in the casing, and only the casing is removed, leaving the soil reinforcement column in the soft ground at the bottom of the water. It is characterized by this.

以下、図によって本発明を具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to the drawings.

第1図は木簡−(第二)発明の一実施例に伴う改良杭造
成装置(要部)の縦断面図、および第2図はバルーン(
流体入り可撓性袋状体)を先端とする砂袋柱(地盤強化
剤袋柱)がケーシング内の水を排出しながら沈降する状
態を示す縦断面図である。
Figure 1 is a longitudinal sectional view of the improved pile building device (principal part) according to an embodiment of the wooden tablet (second) invention, and Figure 2 is a longitudinal sectional view of the improved pile making device (principal part) according to an embodiment of the wooden tablet (second) invention.
FIG. 3 is a longitudinal cross-sectional view showing a state in which a sand bag pillar (soil reinforcement bag pillar) having a fluid-filled flexible bag-like body at its tip sinks while draining water inside the casing.

まず、木簡−発明について説明する。First, the wooden tablet invention will be explained.

) 第1図において、1はケーシング、2はその底にヒンジ
等で開閉可能に設けられた底栓である。ケーシング−が
すでに水底(6は水[i)の軟弱地盤4中に打込まれ、
ケーシング1内に水W・が浸入し残存している(底栓2
が開いた状態でケーシング1が水面6下に入れられ、軟
弱地盤4に着床と同時に底栓2はヒ“ンジ等によって自
然に閉められるので、ケーシング1内に水Wが残る)。
) In FIG. 1, 1 is a casing, and 2 is a bottom plug provided at the bottom of the casing so as to be openable and closable with a hinge or the like. The casing has already been driven into the soft ground 4 of the water bottom (6 is water [i),
Water W has entered the casing 1 and remains (bottom plug 2).
The casing 1 is placed under the water surface 6 in an open state, and the bottom plug 2 is automatically closed by a hinge or the like at the same time as it lands on the soft ground 4, so water W remains inside the casing 1).

ケーシング1の上端には支持枠5が固設され、この支持
枠5の上端6を矢印Hで示す向きに、作業船(図示せず
)上に設けたノ\ンマー(図示せず)等で打撃すること
により、ケーシング1が水底の軟弱地盤4中に打込まれ
るのである。
A support frame 5 is fixed to the upper end of the casing 1, and the upper end 6 of this support frame 5 is fixed in the direction shown by arrow H with a mark (not shown) or the like provided on a work boat (not shown). By striking, the casing 1 is driven into the soft ground 4 at the bottom of the water.

支持枠5の中間には中間板7が固設され、中間板7の下
方には砂袋装着具8が取付けられている。この砂袋装着
具8の外周には、予め所要の径と長さを有する有底円筒
状網袋に縫製された砂袋9が、長手方向に圧縮されて蛇
腹状に装着されている。なお、砂Sの入った部分の砂袋
9′は、砂Sの自重により長手方向に伸ばされている。
An intermediate plate 7 is fixedly installed in the middle of the support frame 5, and a sandbag attachment device 8 is attached below the intermediate plate 7. A sand bag 9, which has been sewn in advance into a bottomed cylindrical net bag having a required diameter and length, is compressed in the longitudinal direction and attached to the outer periphery of the sand bag attachment device 8 in an accordion shape. Note that the sand bag 9' containing the sand S is stretched in the longitudinal direction by the sand S's own weight.

一方、中間板7および砂袋装着具8の中央開口部を貫通
して、ホッパー付送砂管10が抜出し可能に載置されて
いる。
On the other hand, a sand feed pipe 10 with a hopper is mounted so as to be able to be extracted, passing through the central opening of the intermediate plate 7 and the sand bag mounting device 8.

支持枠5の下部には、砂袋9に砂Sを詰めるときの案内
となる案内筒11が設けられている。
A guide cylinder 11 is provided at the lower part of the support frame 5 to serve as a guide when filling the sand bag 9 with sand S.

さらに、案内筒11の下端開口部(ケーシング1上端と
の境界)には、複数のローラよりなる可動ストッパ12
が設けられている。可動ストッパ12は、適当なアクチ
ュエータたとえば油圧シリンダ16の操作により、リン
ク14などを介して、案内筒11の軸方向とほぼ直交す
る方向に抜差し自在に移動することができる。
Furthermore, a movable stopper 12 consisting of a plurality of rollers is provided at the lower end opening of the guide tube 11 (boundary with the upper end of the casing 1).
is provided. The movable stopper 12 can be freely inserted and removed in a direction substantially perpendicular to the axial direction of the guide cylinder 11 via a link 14 by operating a suitable actuator, such as a hydraulic cylinder 16.

15はバルーン(流体入り可撓性袋状体)であり、自然
状態でのその外径がケーシング1の内径とほとんど等し
いか、若干率さなものが、好ましく使用され得る。16
はケーシング1内に浸入し残存している水Wの上面であ
り、水面16上にバルーン15が挿入、載置されている
Reference numeral 15 denotes a balloon (flexible fluid-filled bag), and a balloon whose outer diameter in its natural state is almost equal to or slightly smaller than the inner diameter of the casing 1 can be preferably used. 16
is the upper surface of the water W that has entered and remains in the casing 1, and the balloon 15 is inserted and placed on the water surface 16.

なお、バルーン15は必ずしも水面16に接していなく
てもよく、たとえばバルーン15′のように水面16よ
りも上方に嵌挿されていてもよい。
Note that the balloon 15 does not necessarily have to be in contact with the water surface 16, and may be inserted above the water surface 16, for example, like a balloon 15'.

要するに、水面16と砂袋9との間に、ノぐルー215
 (15’ )が嵌挿されていればよいのであって、砂
袋9がバルーン15を先端としてケーシング1外を沈降
するときには、いずれも同じ状態番こなる(第2図参照
)。
In short, between the water surface 16 and the sand bag 9, the noguru 215
(15') is only required to be inserted, and when the sand bag 9 sinks outside the casing 1 with the balloon 15 at the tip, the same state is reached in both cases (see FIG. 2).

ただし、ケーシング1内に残存している水Wの量が少な
すぎて、水面16の位置があまりに低い場合には、ケー
シング1内に水を加えて水面16をある程度ケーシング
1の上端に近づけてから、バルーン15をケーシング1
内に挿入するようにすることが好ましい。
However, if the amount of water W remaining in the casing 1 is too small and the water level 16 is too low, add water to the casing 1 to bring the water level 16 closer to the upper end of the casing 1 to some extent. , balloon 15 with casing 1
It is preferable to insert it inside.

ケーシング1の底端のやや上部には排水口17が設けら
れ、この排水口17と連通して、排水管18が水面3の
上方に突出するように設けられている。19は排水ポン
プ、20は排水ノくルブである。
A drain port 17 is provided slightly above the bottom end of the casing 1, and a drain pipe 18 is provided so as to communicate with the drain port 17 and project above the water surface 3. 19 is a drain pump, and 20 is a drain knob.

このような第1図の装置を用いて、木簡−発明を実施す
る際の手順について、つぎに説明する。
The procedure for implementing the wooden tablet invention using the apparatus shown in FIG. 1 will be described below.

ケーシング1を水底軟弱地盤4に打込んだ後、ケーシン
グ1内(水面16上、またはそれよりも上方)にバルー
ン15 (15’)を挿入する。バルーン15としては
、空気等のガスを入れた弾性球や水等の液体を入れた弾
性球など一要するに、流したがって、バルーン15の素
材としては、通気性0通水性のないもの(ゴムや合成樹
脂など)が好ましい。
After the casing 1 is driven into the water bottom soft ground 4, the balloon 15 (15') is inserted into the casing 1 (on or above the water surface 16). The balloon 15 can be made of an elastic ball filled with a gas such as air or an elastic ball filled with a liquid such as water. resin, etc.) are preferred.

その後、ホッパー付送砂管10を介して、作業船(図示
せず)から自然湿潤砂Sを供給し、案内筒11におし♂
て砂袋9′内に砂詰めをおこなう。
Thereafter, naturally moist sand S is supplied from a work boat (not shown) through a sand pipe 10 with a hopper and placed in a guide tube 11 ♂
Fill the sand bag 9' with sand.

このとき、可動ストッパ12は案内筒11の下端開口部
に位置して、砂袋9′の底部を支持している。
At this time, the movable stopper 12 is located at the lower end opening of the guide tube 11 and supports the bottom of the sand bag 9'.

砂詰めがある段階にまで達したら、油圧シリンダ16お
よびリンク14の操作によってストッパ12を抜去る。
When the sand filling reaches a certain stage, the stopper 12 is removed by operating the hydraulic cylinder 16 and the link 14.

それにより、砂袋9′は自重でケーシング1内に落下し
、バルーン15の上面に達する(第2図参照)。このと
き、砂詰めは依然続行されており、バルーン15を介し
て、ケーシング1内の水Wには砂袋柱21による圧力が
印加される。
As a result, the sand bag 9' falls into the casing 1 under its own weight and reaches the top surface of the balloon 15 (see FIG. 2). At this time, the sand filling is still continuing, and the pressure by the sand bag column 21 is applied to the water W in the casing 1 via the balloon 15.

したがって、水Wは第2図の矢印の向きに押される。そ
の圧力および排水ポンプ19の補助吸引作用により、水
Wは排水管18を通じてケーシング1外へ排出される。
Therefore, the water W is pushed in the direction of the arrow in FIG. Due to this pressure and the auxiliary suction action of the drain pump 19, the water W is discharged out of the casing 1 through the drain pipe 18.

このとき、排水速度すなわち砂袋柱21の沈降速度は、
砂Sの供給速度および排水パルプ20の開度により調整
され得る。
At this time, the drainage speed, that is, the settling speed of the sand bag pillar 21 is:
It can be adjusted by the sand S supply rate and the opening degree of the drainage pulp 20.

このようにして、バルーン15を先端とする砂袋柱21
をケーシング1内に沈降させ、最後に砂袋柱21が着底
したらケーシング1を引上げて(このとき、底栓2はヒ
ンジ等により自然に開放される)、砂袋柱21を軟弱地
盤、4中に地盤改良杭として残すのである。なお、バル
ーン15は改良杭の底に残っていてもかまわないが、た
とえばケーシング1の底栓2の上面に針のような手段を
設けておしずて、バルーン15をつぶすようにすること
もできる。
In this way, the sandbag pillar 21 with the balloon 15 at the tip
is allowed to settle in the casing 1, and finally, when the sandbag column 21 reaches the bottom, the casing 1 is pulled up (at this time, the bottom plug 2 is naturally opened by a hinge etc.), and the sandbag column 21 is placed on soft ground, 4 They are left inside as ground improvement piles. Note that the balloon 15 may remain at the bottom of the improved pile, but it is also possible to crush the balloon 15 by providing a needle-like device on the top surface of the bottom plug 2 of the casing 1. can.

木簡−発明において最も大切なことは、砂袋柱21の先
端、すなわち砂袋柱21とケーシング1内の水Wとの境
界に、流体入り可撓性袋状体であるバルーン15を設け
ていることである。バルーン15には流体が充填されて
いるため内圧があり、しかも可撓性袋状体であるため、
上部からの砂袋柱21の圧力および下部からの水Wの圧
力をともに受けることにより、ケーシング1の軸方向と
直交する方向にやや扁平状に変形して、ケーシング1.
の内壁に密着するように押しつけられる(第2図参照)
0 したがって、砂袋柱21の先端に位置するバルーン15
が、水Wの砂袋柱21への浸入上昇を防ぐ遣水材として
作用するとともに、砂袋柱21の自重による圧力を受け
て水Wを押下げ排水する際のピストンとしても作用する
ことになる。
Wooden tablet - The most important thing in the invention is that a balloon 15, which is a fluid-filled flexible bag, is provided at the tip of the sandbag pillar 21, that is, at the boundary between the sandbag pillar 21 and the water W in the casing 1. That's true. Since the balloon 15 is filled with fluid, there is internal pressure, and since it is a flexible bag-like body,
By receiving both the pressure of the sand bag column 21 from the upper part and the pressure of the water W from the lower part, the casing 1 is deformed into a slightly flattened shape in a direction perpendicular to the axial direction of the casing 1.
(See Figure 2)
0 Therefore, the balloon 15 located at the tip of the sandbag pillar 21
acts as a water discharging material to prevent water W from entering and rising into the sandbag column 21, and also acts as a piston when pushing down and draining water W under pressure due to the sandbag column 21's own weight. .

バルーン15によって水Wの砂袋柱21への浸入上昇が
防止される結果、砂袋柱21内の砂Sはボイリング(沸
上り、舞上り)を生ずることがないため、砂袋9′内に
充填された砂Sが砂袋柱21を形成して安定するのに要
する時間(サイクルタイム)が従来の水締め工法よりも
短くてすみ、施工性が改善される。
As a result of preventing the water W from entering and rising into the sand bag column 21 by the balloon 15, the sand S in the sand bag column 21 does not boil (boiling up, rising), so that the water W does not rise inside the sand bag 9'. The time (cycle time) required for the filled sand S to form the sand bag column 21 and become stable is shorter than that of the conventional water tightening method, and workability is improved.

と同時に、砂袋柱21を形成している砂Sは自然湿潤状
態を保ったまま、水底の軟弱地盤4中に埋込まれること
になるため、従来の水締め工法による高密度充填の固い
砂袋杭に比べて、より柔軟性、流動性を保つことができ
、軟弱地盤4の変動に対してもより容易かつ柔軟に追従
することができる。
At the same time, the sand S forming the sand bag pillars 21 will be buried in the soft ground 4 at the bottom of the water while maintaining its natural moist state, so the sand S forming the sand bag pillars 21 will be buried in the soft ground 4 at the bottom of the water. Compared to the pile pile, it is possible to maintain more flexibility and fluidity, and it is possible to follow the fluctuations of the soft ground 4 more easily and flexibly.

さらに、自然湿潤砂Sをそのまま用いるだけでよいので
、従来の水締め工法に比べて余分の砂が必要でなくなグ
、それだけ材料コストも低減することができる。
Furthermore, since it is sufficient to simply use the naturally wet sand S, no extra sand is required compared to the conventional water tightening method, and the material cost can be reduced accordingly.

以上は木簡−発明についての説明であったが、木簡二、
第三および第四発明についても同様である。
The above was an explanation about the invention of wooden tablets.
The same applies to the third and fourth inventions.

すなわち、水底軟弱地盤4の改良杭を構成する素材とし
て、砂袋9′に砂Sを充填した砂袋柱21を用いる代り
に、袋9′に地盤強化剤(たとえば石灰、生石灰、消石
灰など)を充填した地盤強化剤袋柱21′を用いること
もできる。これが本第二発明である。
That is, instead of using the sand bag column 21 in which the sand bag 9' is filled with sand S as a material for constructing the improved pile for the soft underwater ground 4, the bag 9' is filled with a soil strengthening agent (for example, lime, quicklime, slaked lime, etc.). It is also possible to use a soil reinforcement bag column 21' filled with . This is the second invention.

また、木簡−9第二発明において、バルーン15が完全
な遮水付着ピストンとして作用することができるため、
あえて袋9 (9’)を用いずに、バルーン15上に直
接、砂Sまたは前記地盤強化剤を充填して、砂柱または
地盤強化剤柱を形成することもできる。これが本第三お
よび第四発明である。
In addition, in the second invention of Wooden Tablet-9, since the balloon 15 can act as a complete water-shielding adhesion piston,
It is also possible to directly fill the sand S or the ground strengthening agent onto the balloon 15 without using the bag 9 (9') to form a sand column or a ground strengthening agent column. This is the third and fourth inventions.

木簡三、第四発明においては、第1図に示したような砂
袋装着具8.砂袋9.案内筒11.ストッパ12.油圧
シリンダ16およびリンク14等の装置6部材は不要に
なる。
In the third and fourth wooden tablet inventions, a sandbag attachment device 8 as shown in FIG. Sandbag9. Guide tube 11. Stopper 12. Device 6 members such as hydraulic cylinder 16 and link 14 become unnecessary.

以上説明したように、本、第一〜第四′発明は上記構成
からなるため、次のような効果を奏することができる。
As explained above, since the present invention, the first to fourth' inventions have the above-mentioned configuration, the following effects can be achieved.

■ 砂袋柱、地盤強化剤装柱、砂柱および地盤強化剤柱
の先端(底)にあるバルーンが、ケーシング内壁に密着
してピストンとして作用するため、前記各柱はその自重
による圧力(および排水ポンプの補助吸引作用)によっ
てケーシング内の水を押下げながら徐々に沈降し、かつ
ケーシング内の水が各柱沈降時のダンパーとして作用す
るため、両者相俟って、各柱の沈降速度をより適当に制
御することができる。
■ The balloons at the tips (bottoms) of the sand bag column, soil reinforcement column, sand column, and soil reinforcement column are in close contact with the inner wall of the casing and act as pistons, so each column is subject to pressure (and The water inside the casing is pushed down by the auxiliary suction action of the drainage pump and gradually settles, and the water inside the casing acts as a damper when each column settles, so these two work together to reduce the settling speed of each column. It can be controlled more appropriately.

したがって、冒頭に説明した従来の無水工法に比べて、
ケーシング内に必然的に浸入し残存する水を砂袋柱等沈
降時のダンパーとして有効に活用することができるので
、より容易かつ確実に砂袋柱等の沈降速度を制御するこ
とができる。
Therefore, compared to the conventional waterless construction method explained at the beginning,
Since the water that inevitably enters and remains in the casing can be effectively used as a damper when the sandbag pillars, etc. settle, the settling speed of the sandbag pillars, etc. can be controlled more easily and reliably.

また、バルーンおよびケーシング内の水がダンパー兼(
可動)ストッパーとして作用するため、砂袋柱等の自重
が大きくなっても袋が切れる恐れはなく、原理的にどん
なに深い水底の場合にも適用することができる。
Also, the water inside the balloon and casing acts as a damper (
Since it acts as a movable stopper, there is no fear that the bag will break even if the weight of the sand bag column becomes large, and in principle it can be used no matter how deep the bottom of the water is.

■ バルーンが上下から圧力を受けてケーシング内壁に
密着し、水が砂袋柱等へ浸入上昇するのを防ぐ遮水材と
しても作用するため、砂袋柱等の砂等はボイリングをお
こすことなく、短時間で安定して砂袋柱等を形成するこ
とができる。したがって、施工性がよい。
■ The balloon receives pressure from above and below and adheres closely to the inner wall of the casing, which also acts as a water barrier to prevent water from entering and rising into the sandbag pillars, etc., so the sand in the sandbag pillars does not boil. , it is possible to form sandbag pillars etc. stably in a short time. Therefore, workability is good.

と同時に、自然湿潤状態を保ったまま、水底の軟弱地盤
中に砂袋柱等を埋込むことができるため、従来の水締め
工法による高密度に固く締まった杭に比べ、より柔軟性
のある改良杭を造成することができるので、軟弱地盤の
変動に対してもより容易かつ柔軟に追従することができ
る。
At the same time, sandbag pillars, etc. can be embedded in the soft ground at the bottom of the water while maintaining natural moisture, making them more flexible than the highly densely compacted piles created using the conventional water tightening method. Since improved piles can be constructed, it is possible to more easily and flexibly follow changes in soft ground.

また、余分の砂が必要でないため使用量が低減できて、
経済的にも優れている。さらに、ケーシング内沈降中に
は完全遮水できるので、たとえば生石灰を主体とする地
盤強化剤を使用する場合にも、いたずらに水と反応する
ことなく、安定してかつ速やかに改良杭を造成すること
ができる。
In addition, since no extra sand is required, the amount used can be reduced.
It is also economically superior. Furthermore, since water can be completely blocked during settling in the casing, improved piles can be created stably and quickly without unnecessarily reacting with water, even when using a soil reinforcement agent mainly composed of quicklime. be able to.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本館−(第二)発明の一実施例に伴う改良杭造
成装置(要部)の縦断面図、および第2図はバルーン(
流体入り可撓性袋状体)を先端とする砂袋柱(地盤強化
剤袋柱)がケーシング内の水を排出しながら沈降する状
態を示す縦断面図である。 1・・・ケーシング、4・・・水底の軟弱地盤、10・
・・ホッパー付送砂管、15・・・バルーン(流体入り
可撓性袋状体)、21・・・砂袋柱(あるいは21′・
・・地盤強化側袋柱)。 代理人 弁理士  小 川 信 − 弁理士  野 口 賢 照 弁理士 斎下和彦
Figure 1 is a vertical sectional view of the main building - (second) improved pile making device (principal parts) according to an embodiment of the invention, and Figure 2 is a vertical cross-sectional view of the improved pile making device (principal part) according to an embodiment of the invention.
FIG. 3 is a longitudinal cross-sectional view showing a state in which a sand bag pillar (soil reinforcement bag pillar) having a fluid-filled flexible bag-like body at its tip sinks while draining water inside the casing. 1...Casing, 4...Soft ground at the bottom of the water, 10.
...Sand feed pipe with hopper, 15...Balloon (flexible bag-like body filled with fluid), 21...Sand bag column (or 21')
... Ground reinforcement side bag pillar). Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

【特許請求の範囲】 1、水底軟弱地盤中に改良杭を造成する際、該水底軟弱
地盤にケーシングを打込んだ後、該ケーシング内に流体
入りの可撓性袋状体を挿入−し、該可撓性袋状体の上か
ら砂を充填した有底円筒状の袋をケーシング内に投入し
て、可撓性袋状体を先端とする砂袋柱を形成せしめ、該
砂袋柱を、ケーシング内の可撓性袋状体よりも下面にあ
る水を排出せしめなからケーシング底部まで沈降せしめ
、該砂袋柱を水底軟弱地盤中に残して、ケーシングのみ
を抜去ることを特徴とする水底軟弱地盤の改良杭造成工
法。  ゛ 2、水底軟弱地盤中に改良杭を造成する際、該水底軟弱
地盤にケーシングを打込んだ後、該ケーシング内に流体
入りの可撓性袋状体を挿入し、該可撓性袋状体の上から
地盤強化剤を充填した有底円筒状の袋をケーシング内に
投入して、可撓性袋状体を先端とする地盤強化剤袋柱を
形成せしめ、該地盤強化剤袋柱を、ケーシング内の可撓
性袋状体よりも下面にある水を排出せしめムがらケーシ
ング底部まで沈降せしめ、該地盤強化剤袋柱を水底軟弱
地盤中に残して、ケーシングのみを抜去ることを特徴と
する水底軟弱地盤の改良杭造成工法。 3、水底軟弱地盤中に改良杭を造成する際、該水底軟弱
地盤にケーシングを打込んだ後、該ケーシング内に流体
入りの可撓性袋状体を挿入し、該可撓性袋状体の上から
砂を直接ケーシング内に充填して、可撓性袋状体を先端
とする砂柱を形成せしめ、該砂柱を、ケーシング内の可
撓性袋状体よりも下面にある水を排出せしめなからケー
シング底部まで沈降せしめ、該砂柱を水底軟弱地盤中に
残して、ケーシングのみを抜去ることを特徴とする水底
軟弱地盤の改良杭造成工法。 4、水底軟弱地盤中に改良杭を造成する際、該水底軟弱
地盤にケーシングを打込んだ後、該ケーシング内に流体
入りの可撓性袋状体を挿入し、該可撓性袋状体の上から
地盤強化剤を直接ケーシング内に充填して、可撓性袋状
体を先端とする地盤強化剤柱を形成せしめ、該地盤強化
剤柱を、ケーシング内の可撓性袋状体よりも下面にある
水を排出せしめなからケーシング底部まで沈降せしめ、
該地盤強化剤柱を水底軟弱地盤中に残して、ケーシング
のみを抜去ることを特徴とする水底軟弱地盤の改良杭造
成工法。
[Claims] 1. When constructing improved piles in soft underwater ground, after driving a casing into the soft underwater ground, inserting a flexible bag-like body containing fluid into the casing; A bottomed cylindrical bag filled with sand is placed into the casing from above the flexible bag-like body to form a sand bag column with the flexible bag-like body at the tip, and the sand bag column is , the water below the flexible bag-like body inside the casing is drained and allowed to settle to the bottom of the casing, and only the casing is removed, leaving the sand bag column in the soft ground at the bottom of the water. Improved pile construction method for soft underwater ground.゛2. When constructing improved piles in soft ground with a water bottom, after driving a casing into the soft ground with a water bottom, a flexible bag-like body containing fluid is inserted into the casing, and the flexible bag-like body A bottomed cylindrical bag filled with a soil strengthening agent is placed into the casing from above the body to form a soil strengthening agent bag pillar with the flexible bag-like body at the tip, and the soil strengthening agent bag pillar is , the water below the flexible bag-like body inside the casing is drained and allowed to settle to the bottom of the casing, and only the casing is removed, leaving the soil strengthening agent bag column in the soft ground at the bottom of the water. This is an improved pile construction method for soft underwater ground. 3. When constructing improved piles in soft underwater ground, after driving a casing into the soft underwater ground, insert a flexible bag-like body containing fluid into the casing, and Sand is directly filled into the casing from above to form a sand column with the flexible bag-like body at the tip, and the water below the flexible bag-like body in the casing is drained from the sand column. An improved method for constructing piles for soft ground under water, characterized by allowing the sand to settle to the bottom of the casing from the discharge, leaving the sand column in the soft ground under water, and removing only the casing. 4. When constructing improved piles in soft water bottom ground, after driving a casing into the soft water bottom ground, a flexible bag-like body containing fluid is inserted into the casing, and the flexible bag-like body A soil strengthening agent is directly filled into the casing from above to form a soil strengthening agent column with a flexible bag-like body at the tip, and the soil strengthening agent column is inserted into the casing from the flexible bag-like body inside the casing. The water on the bottom surface is drained and allowed to settle to the bottom of the casing.
An improved method for constructing piles for soft underwater ground, characterized in that the soil reinforcement column is left in the soft underwater ground, and only the casing is removed.
JP14627281A 1981-09-18 1981-09-18 Improved pile formation work for soft ground under water Granted JPS5847817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14627281A JPS5847817A (en) 1981-09-18 1981-09-18 Improved pile formation work for soft ground under water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14627281A JPS5847817A (en) 1981-09-18 1981-09-18 Improved pile formation work for soft ground under water

Publications (2)

Publication Number Publication Date
JPS5847817A true JPS5847817A (en) 1983-03-19
JPS6251325B2 JPS6251325B2 (en) 1987-10-29

Family

ID=15403980

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14627281A Granted JPS5847817A (en) 1981-09-18 1981-09-18 Improved pile formation work for soft ground under water

Country Status (1)

Country Link
JP (1) JPS5847817A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6245817A (en) * 1985-08-23 1987-02-27 Toa Harbor Works Co Ltd Underwater backdraining work

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5721618A (en) * 1980-07-11 1982-02-04 Toyo Kensetsu Kk Construction of sand bag pile in soft ground under water

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5721618A (en) * 1980-07-11 1982-02-04 Toyo Kensetsu Kk Construction of sand bag pile in soft ground under water

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6245817A (en) * 1985-08-23 1987-02-27 Toa Harbor Works Co Ltd Underwater backdraining work

Also Published As

Publication number Publication date
JPS6251325B2 (en) 1987-10-29

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