JPS62164912A - Method and apparatus for improving ground under water - Google Patents

Abstract

PURPOSE:To prevent the pollution (or mudding) of water as well as raise the stirring efficiency of a ground improving agent by pressurizing the inside of a casing. CONSTITUTION:A screw driver 17 is attached in a vertically movable manner to a leader 14 erected on a working machine 10. A screw 18 having an injecting hole 22 for a ground improving agent is turned, and while excavating the ground, a groove improving agent is injected. The lower end of a casing 19 covering the periphery of the screw 18 is contacted with with ground under water, compressed air is charged into the casing 19, and while discharging water in the casing 19, the improving agent is injected. The stirring efficiency of the improving agent can thus be raised, the hardening of the improving agent can also be accelerated, and the intermixture of the improving agent into water can be avoided. The pollution (or muddling) of water can be prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、水面下の地盤改良方法とその装置に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an underwater ground improvement method and apparatus.

〔従来の技術〕[Conventional technology]

従来の水中地盤改良方法では、水面上に浮べたポンツー
ンに＠置した作業機や自走式の超湿地用作業機に立設し
たリーダに、スクリュウ駆動装置を昇降可能に設け、こ
のスクリュウ駆動装置によリセメントミルク等の地盤改
良材の注入孔を有するスクリュウを回転し、第４図に示
されるように、水面下の地盤Ｇをスクリュウ１で掘削し
ながらスクリュウ１の先端からセメントミルク等の地盤
改良材を注入して撹拌し、地盤改良材を硬化させて地盤
を改良している。In the conventional underwater ground improvement method, a screw drive device is attached to a leader installed on a pontoon floating on the water surface or a self-propelled super wetland work device so that it can be raised and lowered, and this screw drive device As shown in Fig. 4, a screw having a hole for injecting a ground improvement material such as cement milk is rotated, and while excavating the ground G below the water surface with the screw 1, cement milk, etc. is injected from the tip of the screw 1. The ground is improved by injecting and stirring the soil improving material and letting it harden.

（発明が解決しようとする問題点〕 ところが上記の場合、地盤改良材が水中に混入し、撹拌
効率を低下させるとともに水質を汚濁し、公害を発生さ
せる問題があった。(Problems to be Solved by the Invention) However, in the above case, there is a problem in that the ground improvement material mixes into the water, reduces the stirring efficiency, pollutes the water quality, and causes pollution.

そこで本発明は、地盤改良材の撹拌効率を向上させると
ともに水質の汚濁を防止した水中地盤改良方法とその装
置を提供することを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an underwater soil improvement method and apparatus that improves the stirring efficiency of soil improvement material and prevents water pollution.

〔問題点を解決するための手段〕[Means for solving problems]

上記目的達成のため本発明は、第１発明は作業機に立設
したリーダに冒降可能に設けたスクリュウ駆動装置によ
り、地盤改良材の注入孔を有するスクリュウを回転し、
水中地盤を掘削して地盤改良材を注入する水中地盤改良
方法において、前記スクリュウの外周を覆うケーシング
の下端を水中地盤に接地し、該ケーシング内をエアにて
加圧してケーシング内の水を排出しながら水中地盤を掘
削して地盤改良材を注入することを特徴とする水中地盤
改良方法であり、第２発明は上記方法を実施する水中地
盤改良装置として、作業機に立設したリーダにスクリュ
ウ駆動装置と、該スクリュウ駆動装置により回転し、か
つ地盤改良材の注入孔を有するスクリュウとを昇降可能
に設けた水中地盤改良装置において、前記スクリュウ駆
ｅ装置の下部に前記スクリュウの外周を覆うケーシング
を設け、該ケーシング内を加圧するエアコンプレッサを
配設したことを特徴としている。In order to achieve the above-mentioned object, the present invention has a first invention that rotates a screw having a hole for injecting a soil improvement material by a screw drive device that is movably provided on a leader installed on a working machine,
In an underwater ground improvement method that excavates underwater ground and injects a ground improvement material, the lower end of the casing that covers the outer periphery of the screw is grounded on the underwater ground, and the inside of the casing is pressurized with air to drain the water inside the casing. The second invention is an underwater ground improvement method characterized by excavating the underwater ground and injecting a soil improvement material, and the second invention is an underwater ground improvement device for carrying out the above method, in which a screw is attached to a leader installed upright on a work machine. In an underwater ground improvement device that includes a drive device and a screw that is rotated by the screw drive device and has a hole for injecting a soil improvement material so as to be movable up and down, a casing that covers the outer periphery of the screw is provided at a lower part of the screw drive device. The casing is characterized in that it is provided with an air compressor that pressurizes the inside of the casing.

〔実施例〕〔Example〕

以下、本発明の一実施例を第１図乃至第３図に基づいて
説明する。Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3.

超湿地用作業機１０は、下部走行体１１により泥障地や
水深の浅い水路等を走行できる自走式で、下部走行体１
１の上部に設けた上部旋回体１２の前部のフロントブラ
ケット１３にリーダ１４のブラケット１５を枢着し、バ
ックステー１６にてリーダ１４を起伏可能に支持してい
る。The ultra-wetland working machine 10 is a self-propelled type that can travel on muddy terrain, shallow water channels, etc. with a lower traveling body 11.
A bracket 15 of a leader 14 is pivotally connected to a front bracket 13 at the front of an upper revolving body 12 provided on the upper part of the revolving structure 1, and a backstay 16 supports the leader 14 so as to be able to rise and fall.

リーダ１４にはスクリュウ駆動装置１７が昇降可能に設
けられ、該スクリュウ駆動装置１７の下部にはスクリュ
ウ駆動装置１７の駆動により回転するスクリュウ１８と
、該スクリュウ１８の外周を覆うケーシング１９とが設
けられている。A screw drive device 17 is provided on the leader 14 so as to be movable up and down, and a screw 18 that rotates by the drive of the screw drive device 17 and a casing 19 that covers the outer periphery of the screw 18 are provided below the screw drive device 17. ing.

スクリュウ１８は中央に地盤改良材注入口を形成したバ
イブ状で、上部にセメントミルク等の地盤改良材を注入
するためのスラリースイベル２０を有し、下部先端に掘
削具２１と、該掘削具２１により掘削された穴内に地盤
改良材を注入する注入口２２とを形成している。The screw 18 is in the shape of a vibrator with a ground improvement material injection port formed in the center, has a slurry swivel 20 at the top for injecting a ground improvement material such as cement milk, and has an excavation tool 21 at the bottom tip. An injection port 22 is formed for injecting the ground improvement material into the hole excavated by.

また、ケーシング１９はスクリュウ１８の全長よりもや
や長く、上部をスクリュウ駆動装置１７により密開され
、ケーシング１９内に上部旋回体１２に配設されたエア
コンブレツナユニット２３の配管２４がコントロールバ
ルブ２５を介して接続されている。The casing 19 is slightly longer than the entire length of the screw 18, and its upper part is hermetically opened by the screw driving device 17, and inside the casing 19, the piping 24 of the air conditioner breech nut 23 disposed on the upper revolving body 12 is connected to the control valve 25. connected via.

エアコンプレッサユニット２３はエアコンブレラ普す２
６、ウォータートラップ２７、リリーフバルブ２８、プ
レッシャーレギュレータ２９とで構成されている。Air compressor unit 23 is air compressor unit 2
6, a water trap 27, a relief valve 28, and a pressure regulator 29.

このように構成された超湿地用作業機１０を用いた水中
地盤改良方法を説明すると、先ずスクリュウ駆動装置１
７を下降させて第２図に示されるように、ケーシング１
９を水面下の地ＩＧに接地させながら、エアコンブレラ
１ツユニツト２３から送られるエアによりケーシング１
９内を加圧し、ケーシング１９内の水を排出し、第３図
に示されるように、地盤Ｇを掘削具２１で掘削し、掘削
した穴Ｈ内に注入口２２より地盤改良材を注入し、地盤
改良材を撹拌して硬化させて地盤の改良を行う。To explain the underwater ground improvement method using the ultra-wetland working machine 10 configured in this way, first, the screw drive device 1
7 and lower the casing 1 as shown in FIG.
While grounding the casing 1 to the ground IG under the water surface, air sent from the air converter 1 unit 23
The inside of the casing 19 is pressurized, the water inside the casing 19 is discharged, and as shown in FIG. , improve the ground by stirring and hardening the ground improvement material.

このようにして水中地盤を改良するので、地盤改良材の
撹拌効率が向上するとともに、地盤改良材が水に触れる
ことがないので硬化が促進され、さらに地盤改良材によ
る水質の汚濁が防止される。Since the underwater ground is improved in this way, the agitation efficiency of the soil improvement material is improved, and since the soil improvement material does not come into contact with water, hardening is accelerated, and water pollution caused by the soil improvement material is prevented. .

〔発明の効果〕〔Effect of the invention〕

本発明は上記のように、水中地盤改良装置において、ス
クリュウ駆動装置の下部にスクリュウの外周を覆うケー
シングを設け、該ケーシング内をエアコンプレッサから
供給されるエアで加圧してケーシング内の水を排出しな
がら作業を行なうため、地盤改良材の撹拌効率の向上と
硬化のは進が図れるとともに、地盤改良材が水中に混入
しないので水質の汚濁を防止することができる。As described above, the present invention provides an underwater ground improvement device in which a casing that covers the outer periphery of the screw is provided at the bottom of the screw drive device, and the inside of the casing is pressurized with air supplied from an air compressor to discharge water inside the casing. Since the work is carried out while the work is being carried out, it is possible to improve the stirring efficiency of the ground improvement material and to accelerate the hardening of the ground improvement material, and since the ground improvement material does not mix into the water, it is possible to prevent water pollution.

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

第１図乃至第３図は本発明の一実施例を示し、第１図は
超湿地用作業機の正面図、第２図及び第３図はそれぞれ
本発明による水中地盤改良方法を示す正面図、第４図は
従来の地盤改良方法を示す正面図である。1 to 3 show an embodiment of the present invention, FIG. 1 is a front view of a working machine for super wetlands, and FIGS. 2 and 3 are front views showing an underwater ground improvement method according to the present invention, respectively. , FIG. 4 is a front view showing a conventional ground improvement method.

Claims (1)

【特許請求の範囲】 １、作業機に立設したリーダに昇降可能に設けたスクリ
ュウ駆動装置により、地盤改良材の注入孔を有するスク
リュウを回転し、水中地盤を掘削して地盤改良材を注入
する水中地盤改良方法において、前記スクリュウの外周
を覆うケーシングの下端を水中地盤に接地し、該ケーシ
ング内をエアにて加圧してケーシング内の水を排出しな
がら水中地盤を掘削して地盤改良材を注入することを特
徴とする水中地盤改良方法。 ２、作業機に立設したリーダにスクリュウ駆動装置と、
該スクリュウ駆動装置により回転し、かつ地盤改良材の
注入孔を有するスクリュウとを昇降可能に設けた水中地
盤改良装置において、前記スクリュウ駆動装置の下部に
前記スクリュウの外周を覆うケーシングを設け、該ケー
シング内を加圧するエアコンプレッサを配設したことを
特徴とする水中地盤改良装置。[Scope of Claims] 1. A screw drive device that is movable up and down on a leader installed on a working machine rotates a screw having an injection hole for the ground improvement material, excavates the underwater ground, and injects the ground improvement material. In the underwater ground improvement method, the lower end of the casing that covers the outer periphery of the screw is grounded on the underwater ground, and the inside of the casing is pressurized with air to drain the water inside the casing while excavating the underwater ground to obtain the ground improvement material. An underwater ground improvement method characterized by injecting. 2. A screw drive device is attached to the leader installed on the work machine,
In the underwater ground improvement device, the screw is rotated by the screw drive device and has a hole for injecting a soil improvement material, and the screw is movable up and down. An underwater ground improvement device that is equipped with an air compressor that pressurizes the inside.