JP2022112682A - Ground improvement device - Google Patents

Ground improvement device Download PDF

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JP2022112682A
JP2022112682A JP2021008567A JP2021008567A JP2022112682A JP 2022112682 A JP2022112682 A JP 2022112682A JP 2021008567 A JP2021008567 A JP 2021008567A JP 2021008567 A JP2021008567 A JP 2021008567A JP 2022112682 A JP2022112682 A JP 2022112682A
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center shaft
ground
center
improvement device
soil
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JP7315596B2 (en
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肇一 田中
Hatsuichi Tanaka
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Fudo Tetra Corp
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Abstract

To provide a ground improvement device which can remove soil around a center shaft penetrating a ground without diluting with water in a short period of time and which can easily control an amount of removed soil to reduce an amount of industrial waste.SOLUTION: A ground improvement device 10 makes a center shaft 20 penetrate the ground 7 with rotating and discharges a slurry-like solidification material 8 from a nozzle 24 provided at a tip side of the center shaft 20 when pulling out it, to improve a ground 7 while removing soil 7b of soil 7a around the center shaft 20. A spiral shaftless screw blade 30 whose center is hollow is provided around the center shaft 20 so as to freely rotate by a rotational drive separate from a rotational drive of the center shaft 20.SELECTED DRAWING: Figure 1

Description

本発明は、地盤中にスラリー状の固化材を注入し、排土しながら土壌と固化材との硬化体を造成して地盤を改良する地盤改良装置に関する。 TECHNICAL FIELD The present invention relates to a ground improvement apparatus that injects a slurry-like solidification material into the ground and forms a hardened body of the soil and the solidification material while discharging the soil to improve the ground.

この種の地盤改良装置として、特許文献１に開示されたものがある。この特許文献１に記載の地盤改良装置を図３に示す。この地盤改良装置１は、軸方向にスパイラル状の羽根を有したスクリュー部２ａを一体形成した注入ロッド２と、この注入ロッド２の先端部に連結され、横方向に撹拌翼３ａを張設した撹拌ヘッド３と、注入ロッド２を駆動装置５により上下動させる支柱４と、を備えている。 As a ground improvement device of this type, there is one disclosed in Patent Document 1. FIG. 3 shows the ground improvement device described in Patent Document 1. As shown in FIG. This soil improvement device 1 is connected to an injection rod 2 integrally formed with a screw portion 2a having spiral blades in the axial direction, and the tip of the injection rod 2, and a stirring blade 3a is stretched in the horizontal direction. A stirring head 3 and a support 4 for moving the injection rod 2 up and down by a driving device 5 are provided.

そして、注入ロッド２の地盤７中への貫入時或いは引き抜き時に、固化材圧送ホース６Ａから圧送されて来たスラリー状の固化材８をスイベル６Ｂを介して注入ロッド２の流路に供給して、撹拌翼３ａの先端部に設けられたノズル３ｂから地盤７中に高圧噴射することで、地盤７の土壌７ａの一部をスクリュー部２ａで排土７ｂしながら土壌７ａと固化材８との硬化体９を造成して地盤を改良する。 Then, when the injection rod 2 penetrates into the ground 7 or is pulled out, the slurry-like solidification material 8 pressure-fed from the solidification material pressure-feeding hose 6A is supplied to the flow path of the injection rod 2 through the swivel 6B. A part of the soil 7a of the ground 7 is ejected 7b by the screw part 2a by high-pressure injection into the ground 7 from the nozzle 3b provided at the tip of the stirring blade 3a, and the soil 7a and the solidification material 8 are mixed. A hardened body 9 is created to improve the ground.

特開平８－１４４２６５号公報JP-A-8-144265

しかしながら、前記従来の地盤改良装置１では、注入ロッド２の地盤７への貫入時に、撹拌翼３ａのノズル３ｂから水を噴射させないと、スクリュー部２ａで排土７ｂを持ち上げるのに時間がかかり、また、注入ロッド２に一体形成されたスクリュー部２ａでは、排土７ｂの量をコントロールすることが難しく、産廃量が増えてしまう問題がある。 However, in the conventional soil improvement device 1, when the injection rod 2 penetrates into the ground 7, if water is not injected from the nozzle 3b of the stirring blade 3a, it takes time to lift the unloaded soil 7b with the screw part 2a. Moreover, with the screw portion 2a integrally formed with the injection rod 2, it is difficult to control the amount of the dumped soil 7b, and there is a problem that the amount of industrial waste increases.

そこで、本発明は、前記した課題を解決すべくなされたものであり、地盤中に貫入された中軸の周りの土壌を水で希釈せずに短時間で排土することができ、かつ、排土の量を簡単にコントロールすることができて産廃量を減らすことができる地盤改良装置を提供することを目的とする。 Therefore, the present invention has been made to solve the above-described problems, and is capable of discharging the soil around the central axis that has penetrated into the ground in a short period of time without diluting it with water. To provide a soil improvement device capable of easily controlling the amount of soil and reducing the amount of industrial waste.

本発明は、地盤中に中軸を回転させながら貫入し、引き抜く際に前記中軸の先端側に設けられたノズルからスラリー状の固化材を吐出して、前記中軸の周りの土壌を排土しながら地盤を改良する地盤改良装置であって、前記中軸の周りに、中央が中空でスパイラル状の無軸スクリュー羽根を前記中軸の回転駆動とは別の回転駆動にて回転自在に設けたことを特徴とする。 The present invention penetrates into the ground while rotating the center shaft, and when pulling out, discharges a slurry-like solidification material from a nozzle provided on the tip side of the center shaft, and discharges the soil around the center shaft. A ground improvement device for improving the ground, characterized in that a shaftless screw blade having a hollow center and a spiral shape is provided around the center shaft so as to be freely rotatable by a rotation drive different from the rotation drive of the center shaft. and

本発明によれば、中軸の周りに、中央が中空でスパイラル状の無軸スクリュー羽根を中軸の回転駆動とは別の回転駆動にて回転自在に設けたことで、地盤中に貫入された中軸の周りの土壌を水で希釈せずに短時間で排土することができ、かつ、排土の量を簡単にコントロールすることができて産廃量を減らすことができる。 According to the present invention, a shaftless screw blade having a hollow center and a spiral shape is rotatably provided around the center shaft by a rotation drive different from the rotation drive of the center shaft, so that the center shaft penetrates into the ground. To discharge soil in a short time without diluting the surrounding soil with water, and to easily control the amount of discharged soil to reduce the amount of industrial waste.

本発明の一実施形態の地盤改良装置を示す側面図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the ground improvement apparatus of one Embodiment of this invention. 上記地盤改良装置の要部の部分斜視図である。It is a fragmentary perspective view of the principal part of the said ground improvement apparatus. 従来の高圧噴射撹拌工法に用いられる地盤改良装置の側面図である。It is a side view of the ground improvement apparatus used for the conventional high-pressure injection stirring construction method.

以下、本発明の一実施形態を図面に基づいて説明する。 An embodiment of the present invention will be described below with reference to the drawings.

図１は本発明の一実施形態の地盤改良装置を示す側面図、図２は同地盤改良装置の要部の部分斜視図である。 FIG. 1 is a side view showing a soil improvement device according to one embodiment of the present invention, and FIG. 2 is a partial perspective view of a main part of the same soil improvement device.

図１に示すように、地盤改良装置１０は、地盤７中に中軸２０を回転させながら貫入し、引き抜く際に中軸２０の先端側に設けられたノズル２４からスラリー状の固化材８を吐出して、中軸２０の周りの土壌７ａを排土７ｂしながら、土壌７ａと固化材８との硬化体９を造成して地盤を改良するものである。 As shown in FIG. 1, the soil improvement device 10 penetrates into the ground 7 while rotating the center shaft 20, and discharges the slurry-like solidification material 8 from the nozzle 24 provided on the tip side of the center shaft 20 when pulling out. Then, while the soil 7a around the central shaft 20 is discharged 7b, a hardened body 9 of the soil 7a and the solidifying material 8 is formed to improve the ground.

詳述すると、図１に示すように、地盤改良装置１０は、昇降装置１２により図示しない施工機本体に立設されたリーダ１１に沿って昇降動すると共に、第１の回転駆動装置１３の第１の駆動モータ（駆動モータ）１４により回転自在に設けられた中軸２０と、この中軸２０の周りに、第２の回転駆動装置１５の第２の駆動モータ（別の駆動モータ）１６により回転自在に設けられた中央が中空でスパイラル状の無軸スクリュー羽根３０と、を備えている。 More specifically, as shown in FIG. 1 , the soil improvement device 10 moves up and down along a leader 11 erected on a construction machine main body (not shown) by a lifting device 12 . A center shaft 20 provided rotatably by one drive motor (drive motor) 14 and a second drive motor (another drive motor) 16 of a second rotary drive device 15 rotatably around this center shaft 20 and a shaftless screw blade 30 having a hollow center and a spiral shape provided in the .

図１、図２に示すように、中軸２０は、円筒のパイプ状に形成されていて、その先端部２０ａには、撹拌ヘッド２１が連結されている。この撹拌ヘッド２１の先端には、掘削ビット２２が取り付けられている。また、撹拌ヘッド２１の中央には、撹拌翼２３が横方向に延びるように張設されている。さらに、撹拌ヘッド２１の掘削ビット２２と撹拌翼２３の中間の位置には、一対のノズル２４，２４が設けられている。この一対のノズル２４，２４からは、中軸２０を地盤７から引き抜く際に、固化材圧送ホースとスイベル（いずれも図示省略）を介して中軸２０の内部の流路に供給されるスラリー状の固化材８が地盤７中の土壌７ａに高圧噴射（吐出）されるようになっている。 As shown in FIGS. 1 and 2, the central shaft 20 is formed in the shape of a cylindrical pipe, and a stirring head 21 is connected to the distal end portion 20a thereof. A drilling bit 22 is attached to the tip of the stirring head 21 . In the center of the stirring head 21, a stirring blade 23 is stretched so as to extend in the horizontal direction. Further, a pair of nozzles 24 , 24 are provided at an intermediate position between the drilling bit 22 and the stirring blade 23 of the stirring head 21 . From the pair of nozzles 24 , 24 , when the center shaft 20 is pulled out from the ground 7 , a solidified slurry is supplied to the flow path inside the center shaft 20 via a solidifying material pressure-feeding hose and a swivel (both not shown). The material 8 is high-pressure jetted (discharged) onto the soil 7a in the ground 7. As shown in FIG.

図１に示すように、中央が中空でスパイラル状の無軸スクリュー羽根３０の固定端３１側は、第２の駆動モータ１６により回転する回転駆動板１７に連結されて回転するようになっている。さらに、中央が中空でスパイラル状の無軸スクリュー羽根３０の自由端３２側は、中軸２０の先端部２０ａの周りから離れて配置されている。そして、中軸２０の貫入時及び引き抜き時に、中央が中空でスパイラル状の無軸スクリュー羽根３０を正回転させて、地盤７中の中軸２０の周りの土壌７ａを常に排土７ｂさせるようになっている。 As shown in FIG. 1, the fixed end 31 side of a shaftless screw blade 30 having a hollow center and a spiral shape is connected to a rotary drive plate 17 rotated by a second drive motor 16 so as to rotate. . Furthermore, the free end 32 side of the shaftless screw blade 30 which is hollow in the center and has a spiral shape is arranged apart from the periphery of the tip portion 20a of the central shaft 20 . When the center shaft 20 is penetrated and pulled out, the shaftless screw blade 30 having a hollow center and a spiral shape is rotated in the forward direction so that the soil 7a around the center shaft 20 in the ground 7 is always discharged 7b. there is

尚、中軸２０の貫入時及び引き抜き時には、中軸２０は逆回転される。また、中軸２０の逆回転の速度よりも中央が中空でスパイラル状の無軸スクリュー羽根３０の正回転の速度が速くなるように設定されている。例えば、中軸２０の回転数は２～８ｒｐｍ、無軸スクリュー羽根３０の回転数は０～３０ｒｐｍに設定されている。 The center shaft 20 is reversely rotated when the center shaft 20 is inserted and pulled out. Further, the forward rotation speed of the shaftless screw blade 30 having a hollow center and a spiral shape is set to be higher than the reverse rotation speed of the center shaft 20 . For example, the rotation speed of the center shaft 20 is set to 2 to 8 rpm, and the rotation speed of the shaftless screw blade 30 is set to 0 to 30 rpm.

以上実施形態の地盤改良装置１０によれば、地盤７中に中軸２０を貫入する際と引き抜く際に、中央が中空でスパイラル状の無軸スクリュー羽根３０を正回転させて中軸２０の周りの土壌７ａを地上に引き上げて排土７ｂさせる。 According to the soil improvement device 10 of the above embodiment, when the center shaft 20 is penetrated into the ground 7 and when it is pulled out, the center is hollow and the spiral shaftless screw blade 30 is rotated forward to rotate the soil around the center shaft 20. 7a is pulled up on the ground to discharge soil 7b.

また、中軸２０の地盤７からの引き抜き時に、撹拌ヘッド２１に設けられた一対のノズル２４，２４から地盤７中の土壌７ａにスラリー状の固化材８高圧噴射することで、土壌７ａの一部を無軸スクリュー羽根３０で排土７ｂしながら、土壌７ａと固化材８との硬化体９を造成して地盤を改良する。この硬化体９は、撹拌ヘッド２１から横方向に延びる撹拌翼２３の長さを直径とする円柱状に形成される。 Further, when the center shaft 20 is pulled out from the ground 7, a slurry-like solidification material 8 is injected from a pair of nozzles 24, 24 provided in the stirring head 21 to the soil 7a in the ground 7 at high pressure, thereby partially removing the soil 7a. is discharged by a shaftless screw blade 30, a hardened body 9 of the soil 7a and the solidifying material 8 is created to improve the ground. This hardening body 9 is formed in a cylindrical shape having a diameter equal to the length of the stirring blade 23 extending laterally from the stirring head 21 .

このように、中軸２０の周りに、中央が中空でスパイラル状の無軸スクリュー羽根３０を中軸２０の回転駆動とは別の回転駆動にて回転自在に設けたことで、地盤７中に貫入された中軸２０の周りの土壌７ａを水で希釈せずに短時間で排土することができ、かつ、排土７ｂの量を簡単にコントロールすることができて産廃量を減らすことができる。 In this way, by providing the shaftless screw blades 30 with a hollow center and a spiral shape around the center shaft 20 so as to be rotatable by a rotation drive different from the rotation drive of the center shaft 20, the blade can be penetrated into the ground 7. In addition, the soil 7a around the central shaft 20 can be discharged in a short time without being diluted with water, and the amount of the discharged soil 7b can be easily controlled to reduce the amount of industrial waste.

尚、前記実施形態によれば、中軸の周りに、中央が中空でスパイラル状の無軸スクリュー羽根を単に回転するように設けたが、上下の各羽根間の左右１８０度対向した位置に上下の各羽根間の間隔を保持する保持棒をそれぞれ連結させて中空でスパイラル状の無軸スクリュー羽根が回転時に蛇行しないようにしても良い。 According to the above embodiment, the shaftless screw blades having a hollow center and a spiral shape are provided around the central shaft so as to simply rotate. It is also possible to prevent the hollow, spiral shaftless screw blades from meandering during rotation by connecting holding rods that maintain the intervals between the blades.

７ 地盤
７ａ 土壌
７ｂ 排土
８ スラリー状の固化材
１０ 地盤改良装置
１４ 第１の駆動モータ（駆動モータ）
１６ 第２の駆動モータ（別の駆動モータ）
２０ 中軸
２４ ノズル
３０ 中央が中空でスパイラル状の無軸スクリュー羽根
３１ 固定端
３２ 自由端 7 ground 7a soil 7b excavated soil 8 slurry-like solidification material 10 ground improvement device 14 first drive motor (drive motor)
16 second drive motor (another drive motor)
20 central shaft 24 nozzle 30 shaftless screw blade with hollow center and spiral shape 31 fixed end 32 free end

Claims (3)

地盤中に中軸を回転させながら貫入し、引き抜く際に前記中軸の先端側に設けられたノズルからスラリー状の固化材を吐出して、前記中軸の周りの土壌を排土しながら地盤を改良する地盤改良装置であって、
前記中軸の周りに、中央が中空でスパイラル状の無軸スクリュー羽根を前記中軸の回転駆動とは別の回転駆動にて回転自在に設けたことを特徴とする地盤改良装置。 It penetrates into the ground while rotating the center shaft, and when it is pulled out, a slurry-like solidification material is discharged from a nozzle provided on the tip side of the center shaft to improve the ground while discharging the soil around the center shaft. A ground improvement device,
A ground improvement device, characterized in that a shaftless screw blade having a hollow center and a spiral shape is rotatably provided around the central shaft by a rotational drive different from that of the central shaft. 請求項１記載の地盤改良装置であって、
前記中軸を回転させる駆動モータと、前記中央が中空でスパイラル状の無軸スクリュー羽根を回転させる別の駆動モータと、を備え、
前記中央が中空でスパイラル状の無軸スクリュー羽根の固定端側は、前記別の駆動モータに連結され、かつ、前記中央が中空でスパイラル状の無軸スクリュー羽根の自由端側は、前記中軸の先端部の周りから離れて配置され、
前記中軸の貫入時及び引き抜き時に前記中央が中空でスパイラル状の無軸スクリュー羽根を正回転させて前記中軸の周りの土壌を常に排土させるようにしたことを特徴とする地盤改良装置。 The ground improvement device according to claim 1,
A drive motor for rotating the center shaft, and another drive motor for rotating the shaftless screw blade having a hollow center and a spiral shape,
The fixed end side of the hollow-centered, spiral-shaped shaftless screw blade is connected to the separate drive motor, and the free-end side of the hollow-centered, spiral-shaped shaftless screw blade is connected to the center shaft. spaced apart from around the tip,
A ground improvement device characterized in that the shaftless screw blades, which are hollow in the center and have a spiral shape, are rotated forward when the center shaft is penetrated and pulled out so that the soil around the center shaft is constantly discharged. 請求項２記載の地盤改良装置であって、
前記中軸の貫入時及び引き抜き時に該中軸を逆回転させ、
前記中軸の逆回転の速度よりも前記中央が中空でスパイラル状の無軸スクリュー羽根の正回転の速度が速くなるように設定されていることを特徴とする地盤改良装置。 The ground improvement device according to claim 2,
reverse rotation of the center shaft during insertion and withdrawal of the center shaft;
A ground improvement device characterized in that the forward rotation speed of the hollow spiral shaftless screw blade at the center is set to be faster than the reverse rotation speed of the center shaft.
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