JPH0366820A - Method of improving dredged soil foundation and foundation improving device - Google Patents
Method of improving dredged soil foundation and foundation improving deviceInfo
- Publication number
- JPH0366820A JPH0366820A JP20239489A JP20239489A JPH0366820A JP H0366820 A JPH0366820 A JP H0366820A JP 20239489 A JP20239489 A JP 20239489A JP 20239489 A JP20239489 A JP 20239489A JP H0366820 A JPH0366820 A JP H0366820A
- Authority
- JP
- Japan
- Prior art keywords
- water
- air
- dredged
- mud
- foundation
- 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
Links
- 238000000034 method Methods 0.000 title claims description 9
- 239000002689 soil Substances 0.000 title abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 238000003756 stirring Methods 0.000 description 10
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（イ） 産業上の利用分野
本発明は浚渫泥土地盤の改良方法と地盤改良袋（ロ）
従来の技術
従来、サンドポンプ等で海底の泥土を浚渫し、その泥土
を一定の区画された区域に流し込み、泥土を沈澱させ、
上澄水を放流することにより、埋立地を造成する工法が
あり、上記区域の境界に築堤して、海面より高い埋立地
を造成することが行われている。[Detailed description of the invention] (a) Industrial application field The present invention relates to a dredged mud soil improvement method and a soil improvement bag (b)
Conventional technology Traditionally, mud from the ocean floor was dredged using a sand pump, etc., and the mud was poured into certain demarcated areas, allowing the mud to settle.
There is a method of creating a reclaimed land by discharging supernatant water, and it is done by building a levee at the boundary of the above area to create a reclaimed land higher than sea level.
（ハ） 発明が解決しようとする課題
しかしながら、上記のようにして造成された埋立地は地
盤が固まるのに長期間を要し、上記の築堤のために雑石
等を投入しても、同雑石が泥土が沈澱したばかりの軟弱
な地盤上に載置された状態になり、−見堅固な堤防が築
造されたように見えても、短時間で雑石下方の地盤が沈
降し、そのために堤防が沈降したり崩壊したりすること
があった。(c) Problems to be solved by the invention However, it takes a long time for the ground to solidify in the reclaimed land created as described above, and even if rubble etc. are thrown in for the embankment as described above, the same problem occurs. The debris is placed on soft ground where mud has just settled, and even though it looks like a solid embankment has been built, the ground beneath the debris settles in a short period of time, causing damage. In some cases, embankments subsided or collapsed.
（ニ） 課題を解決するための手段
本発明では、浚渫泥土中に高圧の水または空気を噴出さ
せて浚渫泥土を撹拌し、撹拌された浚渫泥土中に雑石を
投入して、浚渫泥土中に雑石を均一に分布せしめること
を特徴とする浚渫泥土地盤の改良方法と、装置本体の上
部に吊上装置との連結部と水及び空気の供給口を設け、
下部に水噴出口と空気噴出口とを設けてなる地盤改良装
置とを提供せんとするものである。(d) Means for Solving the Problems In the present invention, high-pressure water or air is jetted into the dredged mud to stir the dredged mud, and stones are thrown into the stirred dredged mud. A method for improving dredged muddy ground characterized by uniformly distributing debris, and providing a connection part with a lifting device and a water and air supply port on the upper part of the device body,
It is an object of the present invention to provide a ground improvement device having a water spout and an air spout at the bottom.
（ホ） 作用・効果
本発明によれば、水底からの浚渫泥土を高圧水または高
圧空気の噴出によって撹拌することで、−旦沈澱した泥
土の流動性を高め、この流動性が高くなった泥土中に雑
石を投入することによって、浚渫泥土の深層まで雑石が
沈下させ、浚渫泥土中に雑石を均一に分布させて、強固
な地盤を造成することができる。(E) Functions and Effects According to the present invention, by stirring the dredged mud from the water bottom by jetting high-pressure water or high-pressure air, the fluidity of the mud that has been settled is increased, and the mud with this increased fluidity is By throwing stones into the dredged mud, the stones sink to the deep layer of the dredged mud, and the rocks are evenly distributed in the dredged mud, making it possible to create a strong foundation.
また、上記地盤の改良方法を実施するための地盤改良装
置は、上部に吊上装置との連結部を設けているので、ク
レーン車またはクレーン船等で容易に吊上げ移動するこ
とができ、同装置の自重で下部を泥土中に挿入し、装置
上部に設けた水及び空気の供給口からの高圧の水及び空
気を、下部の水噴出口と空気噴出口から噴出させること
によって、泥土を充分に撹拌することができる。In addition, the ground improvement equipment for carrying out the above-mentioned ground improvement method has a connection part with the lifting equipment at the top, so it can be easily lifted and moved by a crane truck or a crane ship. The lower part is inserted into the mud by its own weight, and high-pressure water and air from the water and air supply ports provided at the top of the device are ejected from the water and air outlets at the bottom to thoroughly remove the mud. Can be stirred.
特に泥土の撹拌に高圧の噴出水や空気を用いることから
、泥土の流動性が著しく増加し、かかる泥土中に投入さ
れた雑石を速やかに深層まで沈下させ、浚渫泥土中に雑
石を均一に分布させることができる。In particular, since high-pressure jet water and air are used to stir the mud, the fluidity of the mud increases significantly, and the debris thrown into the mud quickly sinks to the deep layer, allowing the debris to be uniformly distributed in the dredged mud. It can be distributed as follows.
（へ） 実施例 本発明の実施例を詳細に説明する。(f) Examples Examples of the present invention will be described in detail.
まず、本発明に係る地盤の改良方法を実施するための地
盤改良装置（Ａ）について説明する。First, a ground improvement device (A) for implementing the ground improvement method according to the present invention will be explained.
第１図〜第３図は地盤改良装置（Ａ）を示し、同装置（
Ａ）は外形が縦長の略棒状に形成されており、装置本体
（ａ）は、方形断面を有する角パイプ状であり、上部に
クレーン車またはクレーン船等の吊上装置のフック等を
連結するための連結部（１）を設けると共に、２個の水
供給口（２）と１個の空気供給口（３）とを設けている
。Figures 1 to 3 show the soil improvement device (A).
A) has a vertically elongated, substantially rod-like outer shape, and the device body (a) is a square pipe with a square cross section, and the hook of a lifting device such as a crane truck or a crane ship is connected to the upper part. A connecting portion (1) is provided for this purpose, and two water supply ports (2) and one air supply port (3) are provided.
また、装置本体（ａ）の下部には、ノズルヘッド（４）
が連設されており、同ノズルヘッド（４）の外側周面に
８個の水噴出口（５）と４個の空気噴出口（６〉とが設
けられている。In addition, a nozzle head (4) is located at the bottom of the device main body (a).
Eight water jet ports (5) and four air jet ports (6>) are provided on the outer peripheral surface of the nozzle head (4).
ノズルヘッド（４）は、中実の逆円錐台形状で、自重で
浚渫泥土に侵入するに充分な重量を有している。The nozzle head (4) has a solid inverted truncated cone shape and has enough weight to penetrate the dredged mud under its own weight.
各水噴出口（５）はノズルヘッド（４）の外側周面の等
分位置に、噴射方向を地盤改良装置（Ａ）の中心線から
放射状かつ水平から約１５°下向きにして配設されてい
る。Each water spout (5) is arranged at equal positions on the outer peripheral surface of the nozzle head (4), with the jetting direction radial from the center line of the soil improvement device (A) and about 15° downward from the horizontal. There is.
各空気噴出口（６）はノズルヘッド（４〉の外側周面の
等分位置に、ノズルヘッド（４）の外側面に沿って、噴
射方向を垂直方向から約２０°外側上方向に向けて配設
されている。Each air jet port (6) is positioned equally on the outer peripheral surface of the nozzle head (4), along the outer surface of the nozzle head (4), with the jet direction directed outward and upward at approximately 20 degrees from the vertical direction. It is arranged.
（７） （８）は、それぞれ水供給口（２）、空気供給
口（３）と水噴出口（５）、空気噴出口（６）とを連通
させるための給水管と給気管である。(7) and (8) are a water supply pipe and an air supply pipe for communicating the water supply port (2) and the air supply port (3) with the water jet port (5) and the air jet port (6), respectively.
次に、本発明の地盤の改良方法を、第４図を参照して説
明する。Next, the soil improvement method of the present invention will be explained with reference to FIG.
図中（１０）は外海、〈１１）は堤防、（１２）は浚渫
泥土、（１３）は送水用の水中ポンプ、（１４）は水タ
ンク、（１５）はタービン型の中圧水ポンプ、（Ｐ）は
プランジャ型の高圧水ポンプ、（ｉ６）は送水ホースと
給気ホースとをひと纏めにしたホース、（１７）はコン
プレッサー、（１８）は改良済みの地盤、（１９）は吊
上装置としての移動自在のクレーン車であり、同クレー
ン車（１９）によって、地盤改良装置（Ａ）の下部を同
装置（Ａ）の自重を利用して、−旦沈澱した浚渫泥土（
１２）中に吊下し、送水用の水中ポンプ（１３）からの
海水を、−旦水タンク（１４）に受けて、高圧水ポンプ
（Ｐ）で加圧し、ホース（１６）を介して地盤改良装置
（Ａ）に送り、８個の水噴出口（５）から浚渫泥土（１
２〉中に噴出させると共に、コンプレッサー（１７）か
らの高圧空気を、ホース（１６）を介して地盤改良装置
（Ａ）に送り、４個の空気噴出口（６）から浚渫泥土（
１２）中に噴出させることで、浚渫泥土（（２）を撹拌
する。In the figure, (10) is the open sea, (11) is the embankment, (12) is the dredged mud, (13) is the submersible pump for water supply, (14) is the water tank, (15) is the turbine type medium pressure water pump, (P) is a plunger-type high-pressure water pump, (i6) is a hose that combines a water supply hose and an air supply hose, (17) is a compressor, (18) is an improved ground, and (19) is a lifting hose. This is a mobile crane truck as a device, and the crane truck (19) uses the weight of the device (A) to remove the lower part of the ground improvement device (A) from the dredged mud (19).
12) Suspended in the water tank (14) receives seawater from a submersible pump (13) for water supply, pressurizes it with a high-pressure water pump (P), and sends it to the ground via a hose (16). The dredged mud (1
2), high-pressure air from the compressor (17) is sent to the ground improvement device (A) via the hose (16), and the dredged mud (
12) Stir the dredged mud ((2) by ejecting it into the water.
次いで、撹拌された浚渫泥土〈１２）中に雑石（２０）
を投入して強固な地盤を造成する。Next, debris (20) was added to the stirred dredged mud (12).
to create a strong foundation.
特に、噴出水と噴出空気で撹拌された浚渫泥土（（２）
は流動性が著しく高くなっているので、投入された雑石
（２０）は速やかに深層の海底地盤（Ｇ）まで沈下し、
次々と投入された雑石（２０）によって、浚渫泥土（１
２〉中に雑石（２０）が均一に分布した状態になり、耐
力が大きい強固な地盤を造成することができる。In particular, dredged mud stirred by gushing water and gushing air ((2)
has extremely high fluidity, so the thrown stones (20) quickly sink to the deep seabed ground (G),
The dredged mud (1
2) The debris (20) becomes uniformly distributed in the soil, making it possible to create a strong foundation with high bearing capacity.
なお、雑石（２０）を投入するのは、地盤改良装置（＾
）で浚渫泥土（１２）を撹拌した直後でも、または、地
盤改良装置（Ａ）で浚渫泥土（１２）を撹拌しながら投
入してもよい。Please note that the gravel (20) is introduced using the soil improvement device (^
) may be added immediately after stirring the dredged mud (12), or while stirring the dredged mud (12) using the ground improvement device (A).
また、地盤改良装置（Ａ）の長さを浚渫泥土（１２）の
深さよりも長くして、上記撹拌作業に際し、地盤改良装
置（Ａ＞の下部を、浚渫泥土（Ｉ２）の基底をなす海底
地盤（Ｇ）の上部近傍まで挿入して、浚渫泥土（１２）
を充分に撹拌することが望ましい。In addition, the length of the soil improvement device (A) is made longer than the depth of the dredged mud (12), and during the above-mentioned stirring work, the lower part of the soil improvement device (A Insert the dredged mud (12) to near the top of the ground (G).
It is desirable to stir thoroughly.
本発明の実施例は上記のように構成されており、地盤改
良装置（Ａ）によって、−旦沈澱した浚渫泥土（１２）
を撹拌して、同浚渫泥土（１２）の流動性を高めてから
雑石（２０）を投入することにより、浚渫泥土（１２）
中に雑石（２０）を均一に分布させて、耐力が大なる強
固な地盤を造成することができる。The embodiment of the present invention is configured as described above, and the dredged mud (12) which has been precipitated by the ground improvement device (A) is
By stirring the dredged mud (12) to increase its fluidity, and then adding the debris (20), the dredged mud (12)
By uniformly distributing the debris (20) inside, it is possible to create a strong foundation with high bearing capacity.
また、地盤改良装置（Ａ）は、クレーン車（１９〉また
はクレーン船等の吊上装置で容易に移動することができ
、更に浚渫泥土（（２）を撹拌するのに、高圧水と高圧
空気の噴射を用いているので、機械的な作動部分がなく
、構造が簡単であり、故障も少なく、装置価格を安価に
することができる。In addition, the ground improvement equipment (A) can be easily moved using a lifting device such as a crane truck (19) or a crane ship, and it also requires high-pressure water and high-pressure air to stir the dredged mud ((2)). Since it uses injection, there are no mechanical operating parts, the structure is simple, there are few failures, and the cost of the device can be reduced.
また、地盤改良装置（＾〉の異なる使用法として、第５
図で示すように、クラブパケット（３０）を装備した浚
渫船で浚渫した泥土（３（）を、中継船（３２）の船倉
（３３）に−旦おろし、同船倉（３３）からサンドポン
プ等でパイプライン（３４〉中を圧送して泥土（３１）
を輸送する場合、クラブパケット（３０）で浚渫した泥
土（３１）は塊状をしているため、サンドポンプ等の吸
入口（３５）を詰まらせて、作業を中断させることが頻
繁に発生する。In addition, as a different usage of the ground improvement device (^),
As shown in the figure, mud (3) dredged by a dredger equipped with a club packet (30) is unloaded into the hold (33) of a relay ship (32), and from the hold (33) is pumped with a sand pump, etc. Mud is pumped through the pipeline (34) (31)
When transporting sand, the mud (31) dredged by the club packet (30) is in the form of lumps, so it often clogs the suction port (35) of a sand pump or the like, causing work to be interrupted.
そこで、本発明の地盤改良装置（Ａ）を上記船倉（３３
）中に吊下し、高圧水と高圧空気を泥土（３１）中に噴
射して、塊状の泥土（３１）の流動性を高めることによ
り、吸入口の詰まりを防止して、作業を円滑に行わせる
ことができる。Therefore, the ground improvement device (A) of the present invention is installed in the above ship hold (33
) and injects high-pressure water and high-pressure air into the mud (31) to increase the fluidity of the lumpy mud (31), thereby preventing clogging of the suction port and making work smoother. You can make it happen.
第６図、第７図はノズルヘッドの他実施例を示しており
、前記のノズルヘッド（４）と略同様に構成されている
が、ノズルヘッド（４０）の外周面に大径のノズル取付
孔（４１）を形成して、同ノズル取付孔（４１）の内部
にノズル（４２）を着脱自在に装着可能に構成している
。Figures 6 and 7 show other embodiments of the nozzle head, which are constructed almost the same as the nozzle head (4) described above, but a large diameter nozzle is attached to the outer peripheral surface of the nozzle head (40). A hole (41) is formed so that a nozzle (42) can be detachably attached to the inside of the nozzle attachment hole (41).
ノズル（４２）の種類には噴出孔の孔径の大小、噴射パ
ターンが円形、楕円形のものがあり、この内から浚渫泥
土（１２）の土質に適合したノズル（４２）を遺択する
ことができる。The types of nozzles (42) include those with large and small hole diameters, circular and oval spray patterns, and it is possible to select a nozzle (42) that is suitable for the soil quality of the dredged mud (12). can.
また、中央に穿設した通路（４３）と連通した噴出口（
４４）をノズル取付孔（４１）の下方に開口させており
、同噴出口（４４）から中圧水ポンプ（１５）からの中
圧水又はコンプレッサー（１７）からの高圧空気を噴出
させることができる。In addition, a spout (
44) is opened below the nozzle mounting hole (41), and medium pressure water from the medium pressure water pump (15) or high pressure air from the compressor (17) can be spouted from the jet port (44). can.
更に、通路（４３）から下方に水噴出口（４５）を穿設
して、同水噴出口（４５〉から噴出した水でノズルヘッ
ド（４０）下方の浚渫泥土（１２〉を洗掘することで、
地盤改良装置（Ａ）の沈込みをよくすることができる。Furthermore, a water spout (45) is drilled downward from the passageway (43), and the dredged mud (12>) below the nozzle head (40) is scoured with water spouted from the water spout (45>). in,
It is possible to improve the sinking of the ground improvement device (A).
第１図は本発明に係る地盤改良装置の側面図、第２図は
同底面図、第３図は第２図ｉ−１線断面図、第４図は地
盤の改良方法の説明図、第５図は地盤改良装置の他の使
用例を示す説明図、第６図はノズルヘッドの他実施例を
示す平面図、第７図は第６図ｎ−ｎ断面図。
地盤改良装置
装置本体
連結部
水供給口
空気供給口
水噴出口
（６） ：
（１２）：
（２０）：
空気噴出口
浚渫泥土
雑石Fig. 1 is a side view of the soil improvement device according to the present invention, Fig. 2 is a bottom view thereof, Fig. 3 is a sectional view taken along the line i-1 in Fig. 2, and Fig. 4 is an explanatory diagram of the soil improvement method. FIG. 5 is an explanatory view showing another example of the use of the ground improvement device, FIG. 6 is a plan view showing another embodiment of the nozzle head, and FIG. 7 is a sectional view taken along line n--n in FIG. Ground improvement equipment Main body connection Water supply port Air supply port Water spout (6): (12): (20): Air spout Dredging mud and debris
Claims (1)
させて浚渫泥土（１２）を撹拌し、撹拌された浚渫泥土
（１２）中に雑石（２０）を投入して、浚渫泥土（１２
）中に雑石（２０）を均一に分布せしめることを特徴と
する浚渫泥土地盤の改良方法。 ２）装置本体（ａ）の上部に、吊上装置との連結部（１
）と水供給口（２）と空気供給口（３）とを設け、下部
に水噴出口（５）と空気噴出口（６）とを設けてなる地
盤改良装置。[Claims] 1) The dredged mud (12) is stirred by jetting water and/or air into the dredged mud (12), and the debris (20) is added to the dredged mud (12). Add dredged mud (12
) A method for improving dredged muddy ground, characterized by uniformly distributing debris (20) in ). 2) At the top of the device main body (a), there is a connecting part (1
), a water supply port (2), and an air supply port (3), and a water spout (5) and an air spout (6) at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20239489A JPH0678608B2 (en) | 1989-08-03 | 1989-08-03 | Dredging Mud Land Improvement Method and Ground Improvement Equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20239489A JPH0678608B2 (en) | 1989-08-03 | 1989-08-03 | Dredging Mud Land Improvement Method and Ground Improvement Equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0366820A true JPH0366820A (en) | 1991-03-22 |
| JPH0678608B2 JPH0678608B2 (en) | 1994-10-05 |
Family
ID=16456768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20239489A Expired - Fee Related JPH0678608B2 (en) | 1989-08-03 | 1989-08-03 | Dredging Mud Land Improvement Method and Ground Improvement Equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0678608B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08109657A (en) * | 1994-10-12 | 1996-04-30 | Showa Sangyo:Kk | Sediment removal device |
-
1989
- 1989-08-03 JP JP20239489A patent/JPH0678608B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08109657A (en) * | 1994-10-12 | 1996-04-30 | Showa Sangyo:Kk | Sediment removal device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0678608B2 (en) | 1994-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |