JP2007247184A - Ground consolidation construction method - Google Patents

Ground consolidation construction method Download PDF

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JP2007247184A
JP2007247184A JP2006069456A JP2006069456A JP2007247184A JP 2007247184 A JP2007247184 A JP 2007247184A JP 2006069456 A JP2006069456 A JP 2006069456A JP 2006069456 A JP2006069456 A JP 2006069456A JP 2007247184 A JP2007247184 A JP 2007247184A
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ground
strainer
groundwater
pipe
airtight sheet
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Keiichi Miyazaki
啓一 宮崎
Toshiyuki Hagiwara
敏行 萩原
Mokichi Takahashi
茂吉 高橋
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Nishimatsu Construction Co Ltd
Asahi Techno Co Ltd
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Nishimatsu Construction Co Ltd
Asahi Techno Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground consolidation construction method for consolidating the ground efficiently without requiring time and labor for installing many vertical drains and horizontal drains. <P>SOLUTION: In this ground consolidation construction method, an underground water level reducing device 10 is buried into the ground 1, then a surface of the ground 1 is covered with an airtight sheet 2, and an underground water level is reduced by the underground water level reducing device 10 after that to reduce atmospheric pressure between a surface of underground water and the airtight sheet 2 and let difference between the atmospheric pressure between the surface of underground water and the airtight sheet 2 and atmospheric pressure act on the ground 1 through the airtight sheet 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、地盤圧密工法に関する。   The present invention relates to a ground consolidation method.

従来の地盤圧密工法としては、改良の対象となる地盤に多数の鉛直ドレーンを設け、その上部に水平ドレーンを設け、水平ドレーンの中央部に集水容器を埋設し、集水容器内の水を排水ポンプで排水するドレーン工法がある。この工法では、地盤中の地下水が鉛直ドレーンに浸透し、間隙水圧により上昇し、水平ドレーンを介して集水容器に排水される。このとき水平ドレーン及び集水容器の上部を気密シートで覆い、水平ドレーン及び集水容器の上部と気密シートとの間の空気を真空ポンプで排気することで、大気圧を地盤に上載荷重として作用させることができる。そして、地盤中の地下水の間隙水圧を増大させ、鉛直ドレーンへの排水を促進することで、圧密が促進される（例えば、特許文献１参照）。
特開２００３−１６６２３３号公報 As a conventional ground consolidation method, a large number of vertical drains are provided on the ground to be improved, a horizontal drain is provided at the top, a water collection container is buried in the center of the horizontal drain, and the water in the water collection container is drained. There is a drain method that drains with a drain pump. In this method, groundwater in the ground permeates the vertical drain, rises due to pore water pressure, and is drained to the water collection container through the horizontal drain. At this time, the upper part of the horizontal drain and the water collection container is covered with an airtight sheet, and the air between the upper part of the horizontal drain and the water collection container and the airtight sheet is exhausted by a vacuum pump, so that the atmospheric pressure acts as an overload on the ground. Can be made. And consolidation pressure is accelerated | stimulated by increasing the interstitial water pressure of groundwater in the ground and promoting drainage to a vertical drain (for example, refer to patent documents 1).
JP 2003-166233 A

しかし、上記工法では、多数の鉛直ドレーンや水平ドレーンを設ける手間がかかるという問題があった。また、地盤中の地下水の排水を均一に行うため、気密シート下の空気を均一に吸い出す必要があった。   However, the above construction method has a problem that it takes time to provide a large number of vertical drains and horizontal drains. Moreover, in order to drain the groundwater in the ground uniformly, it was necessary to suck out the air under the airtight sheet uniformly.

本発明の課題は、多数の鉛直ドレーンや水平ドレーンを設ける手間をかけずに、効率よく地盤の圧密を行うことができる地盤圧密工法を提供することである。   The subject of this invention is providing the ground consolidation method which can perform the consolidation of a ground efficiently, without taking the effort which provides many vertical drains and horizontal drains.

以上の課題を解決するため、請求項１に記載の発明は、地盤圧密工法であって、地盤に地下水位低下装置を埋設し、次いで地盤表面を気密シートで覆い、その後前記地下水位低下装置により地下水位を低下させることで地下水面と前記気密シートとの間の気圧を低減させ、地下水面と前記気密シートとの間の気圧と大気圧との差分の圧力を、前記気密シートを介して地盤に作用させることを特徴とする。   In order to solve the above problems, the invention described in claim 1 is a ground consolidation method, wherein a groundwater level lowering device is embedded in the ground, and then the ground surface is covered with an airtight sheet, and then the groundwater level lowering device is used. The air pressure between the ground water surface and the airtight sheet is reduced by lowering the groundwater level, and the pressure difference between the air pressure and the atmospheric pressure between the groundwater surface and the airtight sheet is reduced to the ground via the airtight sheet. It is made to act on.

請求項２に記載の発明は、請求項１に記載の地盤圧密工法であって、前記気密シートの上部にさらに上載荷重を加えることを特徴とする。   A second aspect of the present invention is the ground consolidation method according to the first aspect, wherein an additional load is further applied to an upper portion of the hermetic sheet.

請求項３に記載の発明は、請求項１または２に記載の地盤圧密工法であって、前記地下水位低下装置は、下端に透水性のストレーナ部を有し地盤に埋設されるストレーナ管と、前記ストレーナ管の外周に形成されるフィルターと、前記ストレーナ管内を排気することにより前記フィルターを透過して前記ストレーナ部から前記ストレーナ管内に地下水を流入させる真空ポンプと、前記ストレーナ管内に配置された排水ポンプにより前記ストレーナ管内に流入した地下水を地上に排水する排水管と、を備えることを特徴とする。   Invention of Claim 3 is the ground consolidation method of Claim 1 or 2, Comprising: The said groundwater level fall apparatus has a strainer pipe | tube embedded in the ground which has a water-permeable strainer part in a lower end, A filter formed on the outer periphery of the strainer pipe, a vacuum pump that allows the groundwater to flow into the strainer pipe through the filter by exhausting the inside of the strainer pipe, and drainage disposed in the strainer pipe A drainage pipe for draining groundwater that has flowed into the strainer pipe by a pump to the ground.

請求項４に記載の発明は、地盤に地下水位低下装置を埋設し、次いで前記地下水位低下装置により地下水位を低下させるとともに、地盤に上載荷重を作用させることで地盤を圧密する地盤圧密工法において、前記地下水位低下装置は、下端に透水性のストレーナ部を有し地盤に埋設されるストレーナ管と、前記ストレーナ管の外周に形成されるフィルターと、前記ストレーナ管内を排気することにより前記フィルターを透過して前記ストレーナ部から前記ストレーナ管内に地下水を流入させる真空ポンプと、前記ストレーナ管内に配置された排水ポンプにより前記ストレーナ管内に流入した地下水を地上に排水する排水管と、を備えることを特徴とする。   The invention according to claim 4 is a ground consolidation method in which a groundwater level lowering device is embedded in the ground, and then the groundwater level is lowered by the groundwater level lowering device, and the ground is consolidated by applying an overload to the ground. The groundwater level lowering device includes a strainer pipe having a permeable strainer portion at a lower end, a strainer pipe embedded in the ground, a filter formed on an outer periphery of the strainer pipe, and exhausting the inside of the strainer pipe to remove the filter. A vacuum pump that permeates and allows groundwater to flow into the strainer pipe from the strainer section, and a drainage pipe that drains groundwater that has flowed into the strainer pipe by the drainage pump disposed in the strainer pipe. And

本発明によれば、多数の鉛直ドレーンや水平ドレーンを設ける手間をかけずに、効率よく地盤の圧密を行うことができる。   According to the present invention, it is possible to efficiently compact the ground without taking the trouble of providing a large number of vertical drains and horizontal drains.

以下、図を参照して本発明の実施の形態について詳細に説明する。     Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本発明の実施形態の地盤圧密工法が適用される地盤１を示す断面図である。地盤１は気密シート２により覆われている。気密シート２は空気を透過せず、地盤１の表面の圧密変形に追従して変形する。気密シート２としては、例えばビニールシート等の空気を透過しないシートを用いることができる。   FIG. 1 is a cross-sectional view showing a ground 1 to which a ground consolidation method according to an embodiment of the present invention is applied. The ground 1 is covered with an airtight sheet 2. The airtight sheet 2 does not transmit air and deforms following the consolidation deformation of the surface of the ground 1. As the airtight sheet 2, for example, a sheet such as a vinyl sheet that does not transmit air can be used.

なお、本発明の地盤圧密工法が適用される地盤１には、サンドドレーン、ペーパードレーン等の鉛直ドレーンや水平ドレーンを設けていない。その代わりに、地盤１には地下水位低下装置１０が埋設されている。   The ground 1 to which the ground consolidation method of the present invention is applied is not provided with vertical drains or horizontal drains such as sand drains and paper drains. Instead, a groundwater level lowering device 10 is embedded in the ground 1.

地下水位低下装置１０は、図１に示すように、フィルター２０と、ストレーナ管３０と、排水管４０と、真空ポンプ（図示せず）等からなる。
フィルター２０はストレーナ管３０の外周部に埋設されており、透水性を有する。フィルター２０としては、砂利や巻線等を用いることができる。フィルター２０内には周囲の地盤１から地下水が浸透する。 As shown in FIG. 1, the groundwater level lowering device 10 includes a filter 20, a strainer pipe 30, a drain pipe 40, a vacuum pump (not shown), and the like.
The filter 20 is embedded in the outer periphery of the strainer tube 30 and has water permeability. As the filter 20, gravel, winding, or the like can be used. Groundwater permeates from the surrounding ground 1 into the filter 20.

ストレーナ管３０は地盤１にほぼ鉛直に埋設されており、周囲にフィルター２０が設けられている。ストレーナ管３０は、例えば、鋼管等の非透水性のものからなり、上端は遮蔽され、下部には外周部に穴を設けて水が通るようにしたストレーナ部３１を有する。フィルター２０内の水はストレーナ部３１からストレーナ管３０内に吸引される。   The strainer tube 30 is embedded in the ground 1 substantially vertically, and the filter 20 is provided around it. The strainer pipe 30 is made of, for example, a water-impermeable material such as a steel pipe, and has an upper end shielded, and a lower portion has a strainer portion 31 provided with a hole in the outer peripheral portion so that water can pass therethrough. Water in the filter 20 is sucked into the strainer tube 30 from the strainer portion 31.

ストレーナ管３０の上端には、吸引管３２が設けられている。吸引管３２には地上部に設けられた真空ポンプ（図示せず）と接続されている。ストレーナ管３０内部の空気は吸引管３２を介して真空ポンプにより排気される。
また、ストレーナ管３０の上部には、ストレーナ管３０内の圧力を計測する真空ゲージ３３が設けられている。 A suction tube 32 is provided at the upper end of the strainer tube 30. The suction tube 32 is connected to a vacuum pump (not shown) provided on the ground. The air inside the strainer tube 30 is exhausted by a vacuum pump through the suction tube 32.
A vacuum gauge 33 for measuring the pressure in the strainer tube 30 is provided on the upper portion of the strainer tube 30.

排水管４０は、ストレーナ管３０の上端を貫通して内部に挿入されており、下端に排水ポンプ４１が設けられている。排水ポンプ４１はストレーナ部３１よりも上方に設けられている。排水ポンプ４１は、例えば、ポンプ本体とモーター部が一体化されたものであり、排水管４０の下端に接続されている。   The drain pipe 40 passes through the upper end of the strainer pipe 30 and is inserted therein, and a drain pump 41 is provided at the lower end. The drainage pump 41 is provided above the strainer portion 31. The drainage pump 41 is, for example, a pump body and a motor unit that are integrated, and is connected to the lower end of the drainage pipe 40.

また、排水管４０には、ストレーナ管３０の上端よりも上方に、逆止弁４２が設けられている。逆止弁４２は、排水管４０内の地下水が地上に向かう方向に流れるときに開き、ストレーナ管３０内に向かって逆流するときに閉じる。   The drain pipe 40 is provided with a check valve 42 above the upper end of the strainer pipe 30. The check valve 42 opens when the ground water in the drain pipe 40 flows in the direction toward the ground, and closes when the counter water flows back into the strainer pipe 30.

次に、本発明の地盤圧密工法の手順について説明する。
まず、地下水位低下装置１０の真空ポンプの駆動を開始し、ストレーナ管３０内を減圧する。すると、ストレーナ管３０内の気圧とフィルター２０外部の間隙水圧との圧力差により、フィルター２０内の地下水がストレーナ部３１よりストレーナ管３０内に浸透し始めるとともに、地盤１からフィルター２０内に地下水が浸透し始める。ストレーナ管３０内の水位は、ストレーナ管３０内の気圧とフィルター２０外部の間隙水圧との圧力差による圧力水頭に相当する高さまで上昇しようとする。このとき、真空ポンプによりストレーナ管３０内が減圧されている分、ストレーナ管３０内の気圧とフィルター２０外部の間隙水圧との圧力差が大きくなり、圧力水頭が増大するため、地下水が効率的にストレーナ管３０内に流入する。 Next, the procedure of the ground consolidation method of the present invention will be described.
First, driving of the vacuum pump of the groundwater level lowering device 10 is started, and the inside of the strainer pipe 30 is depressurized. Then, due to the pressure difference between the atmospheric pressure in the strainer pipe 30 and the pore water pressure outside the filter 20, the groundwater in the filter 20 starts to penetrate into the strainer pipe 30 from the strainer portion 31, and the groundwater enters the filter 20 from the ground 1. Begin to penetrate. The water level in the strainer pipe 30 tends to rise to a height corresponding to the pressure head due to the pressure difference between the atmospheric pressure in the strainer pipe 30 and the pore water pressure outside the filter 20. At this time, since the inside of the strainer pipe 30 is depressurized by the vacuum pump, the pressure difference between the atmospheric pressure in the strainer pipe 30 and the pore water pressure outside the filter 20 increases, and the pressure head increases, so that the groundwater is efficiently It flows into the strainer pipe 30.

ストレーナ管３０内の水位が圧力水頭に相当する高さに達する前に、排水ポンプ４１によりストレーナ管３０内に浸透した地下水を排水する。このため、ストレーナ管３０内の水位は常に圧力水頭よりも低い。したがって、地盤１からフィルター２０内に浸透した地下水は常にストレーナ部３１からストレーナ管３０内に流入する。   Before the water level in the strainer pipe 30 reaches a height corresponding to the pressure head, the drainage pump 41 drains groundwater that has permeated into the strainer pipe 30. For this reason, the water level in the strainer pipe 30 is always lower than the pressure head. Therefore, the groundwater that has permeated into the filter 20 from the ground 1 always flows into the strainer pipe 30 from the strainer portion 31.

地下水の排水が継続されると、地盤１内の地下水位が低下する。すると、地盤１の表面が気密シート２によって覆われているため、地下水面と気密シート２との間の空気の容積が増大し、気圧が低下する。   If drainage of groundwater is continued, the groundwater level in the ground 1 will fall. Then, since the surface of the ground 1 is covered with the airtight sheet 2, the volume of air between the groundwater surface and the airtight sheet 2 increases, and the atmospheric pressure decreases.

気密シート２の下部の気圧が気密シート２の上部の気圧（大気圧）よりも低下すると、気密シート２は上下の圧力差により下向きに力を受けるため、地盤１は気密シート２より下向きに力を受け、圧密が促進される。   When the air pressure at the lower part of the airtight sheet 2 is lower than the air pressure (atmospheric pressure) at the upper part of the airtight sheet 2, the airtight sheet 2 receives a downward force due to the pressure difference between the upper and lower sides. And consolidation is promoted.

このように、本発明の地盤圧密工法によれば、地下水位低下装置１０により地下水位を低下させることにより、地下水面と気密シート２との間の気圧と大気圧との差分の圧力を地盤１に対する上載荷重として作用させることができ、地盤１の圧密を促進することができる。   As described above, according to the ground consolidation method of the present invention, the groundwater level is lowered by the groundwater level lowering device 10, whereby the pressure difference between the atmospheric pressure and the atmospheric pressure between the groundwater surface and the airtight sheet 2 is reduced to the ground 1. Therefore, the consolidation of the ground 1 can be promoted.

なお、地盤１に対してさらに上載荷重を加えるために、図２に示すように、気密シート２の上部に盛土等の荷重材３を設け、地下水位低下装置１０による排水を行ってもよい。荷重材３を設けることにより、大気圧による上載荷重に加えて荷重材３の上載荷重を地盤１に加えることができ、さらに地盤１の圧密を促進することができる。   In order to apply an additional load to the ground 1, as shown in FIG. 2, a load material 3 such as embankment may be provided on the upper part of the airtight sheet 2, and the groundwater level lowering device 10 may perform drainage. By providing the load member 3, the upper load of the load member 3 can be applied to the ground 1 in addition to the upper load due to atmospheric pressure, and the consolidation of the ground 1 can be further promoted.

また、荷重材３のみで地盤１を圧密するのに充分な上載荷重が得られる場合には、図３に示すように、気密シート２を設けずに、地盤１の上に直接、荷重材３を設け、地下水位低下装置１０による排水を行ってもよい。地下水位低下装置１０により排水を行う前は、上載荷重は地盤１の土粒子骨格及び間隙水圧により支持されているが、排水を行うことで、上載荷重を土粒子骨格のみで支持することになるため、上載荷重により土粒子骨格が圧縮され、地盤１が圧密される。   In addition, in the case where an overload sufficient to consolidate the ground 1 with only the load material 3 can be obtained, the load material 3 is directly provided on the ground 1 without providing the airtight sheet 2 as shown in FIG. And drainage by the groundwater level lowering device 10 may be performed. Before the drainage by the groundwater level lowering device 10, the upper load is supported by the soil particle skeleton of the ground 1 and the pore water pressure. However, by performing the drainage, the upper load is supported only by the soil particle skeleton. Therefore, the soil particle skeleton is compressed by the overload, and the ground 1 is consolidated.

同様に、地盤１の表面の通気性が低い場合（例えば粘性土等）や、荷重材３の通気性が低い場合にも、図３に示すように、気密シート２を設けずに、地盤１の上に直接、荷重材３を設け、地下水位低下装置１０による排水を行ってもよい。地盤１や荷重材３の通気性が低い場合には、地盤１内の気圧と大気圧との差分の圧力を地盤１または荷重材３に対する上載荷重として作用させることができ、地盤１の圧密を促進することができる。   Similarly, when the air permeability of the surface of the ground 1 is low (for example, viscous soil) or when the air permeability of the load material 3 is low, the ground 1 is not provided as shown in FIG. The load material 3 may be provided directly on the ground and drained by the groundwater level lowering device 10. When the air permeability of the ground 1 or the load material 3 is low, the pressure of the difference between the atmospheric pressure in the ground 1 and the atmospheric pressure can be applied as an overload to the ground 1 or the load material 3, and the consolidation of the ground 1 can be reduced. Can be promoted.

本発明の実施形態の地盤圧密工法が適用される地盤１を示す断面図である。It is sectional drawing which shows the ground 1 to which the ground consolidation method of embodiment of this invention is applied. 本発明の他の実施形態の地盤圧密工法が適用される地盤１を示す断面図である。It is sectional drawing which shows the ground 1 to which the ground consolidation method of other embodiment of this invention is applied. 本発明の他の実施形態の地盤圧密工法が適用される地盤１を示す断面図である。It is sectional drawing which shows the ground 1 to which the ground consolidation method of other embodiment of this invention is applied.

符号の説明Explanation of symbols

１ 地盤
２ 気密シート
３ 荷重材
１０ 地下水位低下装置
２０ フィルター
３０ ストレーナ管
３１ ストレーナ部
４０ 排水管
４１ 排水ポンプ DESCRIPTION OF SYMBOLS 1 Ground 2 Airtight sheet 3 Load material 10 Groundwater level lowering apparatus 20 Filter 30 Strainer pipe 31 Strainer part 40 Drain pipe 41 Drain pump

Claims (4)

地盤に地下水位低下装置を埋設し、次いで地盤表面を気密シートで覆い、
その後前記地下水位低下装置により地下水位を低下させることで地下水面と前記気密シートとの間の気圧を低減させ、
地下水面と前記気密シートとの間の気圧と大気圧との差分の圧力を、前記気密シートを介して地盤に作用させることを特徴とする地盤圧密工法。 A groundwater level lowering device is buried in the ground, and then the ground surface is covered with an airtight sheet.
After that, by lowering the groundwater level by the groundwater level lowering device, the air pressure between the groundwater surface and the airtight sheet is reduced,
A ground consolidation method, wherein a difference pressure between an atmospheric pressure and an atmospheric pressure between a groundwater surface and the airtight sheet is applied to the ground through the airtight sheet. 前記気密シートの上部にさらに上載荷重を加えることを特徴とする請求項１に記載の地盤圧密工法。   The ground consolidation method according to claim 1, wherein an upper load is further applied to an upper portion of the airtight sheet. 前記地下水位低下装置は、下端に透水性のストレーナ部を有し地盤に埋設されるストレーナ管と、
前記ストレーナ管の外周に形成されるフィルターと、
前記ストレーナ管内を排気することにより前記フィルターを透過して前記ストレーナ部から前記ストレーナ管内に地下水を流入させる真空ポンプと、
前記ストレーナ管内に配置された排水ポンプにより前記ストレーナ管内に流入した地下水を地上に排水する排水管と、
を備えることを特徴とする請求項１または２に記載の地盤圧密工法。 The groundwater level lowering device has a strainer pipe embedded in the ground having a permeable strainer portion at the lower end,
A filter formed on the outer periphery of the strainer tube;
A vacuum pump that allows the groundwater to flow from the strainer portion into the strainer pipe through the filter by exhausting the inside of the strainer pipe;
A drainage pipe for draining groundwater flowing into the strainer pipe to the ground by a drainage pump disposed in the strainer pipe;
The ground consolidation method according to claim 1 or 2, further comprising: 地盤に地下水位低下装置を埋設し、次いで前記地下水位低下装置により地下水位を低下させるとともに、地盤に上載荷重を作用させることで地盤を圧密する地盤圧密工法において、
前記地下水位低下装置は、下端に透水性のストレーナ部を有し地盤に埋設されるストレーナ管と、
前記ストレーナ管の外周に形成されるフィルターと、
前記ストレーナ管内を排気することにより前記フィルターを透過して前記ストレーナ部から前記ストレーナ管内に地下水を流入させる真空ポンプと、
前記ストレーナ管内に配置された排水ポンプにより前記ストレーナ管内に流入した地下水を地上に排水する排水管と、
を備えることを特徴とする地盤圧密工法。 In the ground consolidation method of embedding a groundwater level lowering device in the ground, then lowering the groundwater level by the groundwater level lowering device, and compacting the ground by applying an overload to the ground,
The groundwater level lowering device has a strainer pipe embedded in the ground having a permeable strainer portion at the lower end,
A filter formed on the outer periphery of the strainer tube;
A vacuum pump that allows the groundwater to flow from the strainer portion into the strainer pipe through the filter by exhausting the inside of the strainer pipe;
A drainage pipe for draining groundwater flowing into the strainer pipe to the ground by a drainage pump disposed in the strainer pipe;
A ground consolidation method characterized by comprising:
JP2006069456A 2006-03-14 2006-03-14 Ground consolidation construction method Pending JP2007247184A (en)

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Publication number Priority date Publication date Assignee Title
JP2014196614A (en) * 2013-03-29 2014-10-16 清水建設株式会社 Ground improvement method
WO2020240779A1 (en) * 2019-05-30 2020-12-03 株式会社アサヒテクノ Ground improvement method

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JPH03281818A (en) * 1990-03-30 1991-12-12 Toda Constr Co Ltd Soil improvement method for cohesive soil ground
JPH05263416A (en) * 1992-03-16 1993-10-12 Taisei Corp Compaction method for sand ground
JP2000027170A (en) * 1998-05-01 2000-01-25 Nishimatsu Constr Co Ltd Groundwater level lowering device, ground improvement method and strainer device
JP2005351037A (en) * 2004-06-14 2005-12-22 Shimizu Corp Ground improvement method

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JPS52118833A (en) * 1976-03-30 1977-10-05 Matsuo Consultants Method of heightening pressureetightness of reclaimed land under water level
JPH03281818A (en) * 1990-03-30 1991-12-12 Toda Constr Co Ltd Soil improvement method for cohesive soil ground
JPH05263416A (en) * 1992-03-16 1993-10-12 Taisei Corp Compaction method for sand ground
JP2000027170A (en) * 1998-05-01 2000-01-25 Nishimatsu Constr Co Ltd Groundwater level lowering device, ground improvement method and strainer device
JP2005351037A (en) * 2004-06-14 2005-12-22 Shimizu Corp Ground improvement method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014196614A (en) * 2013-03-29 2014-10-16 清水建設株式会社 Ground improvement method
WO2020240779A1 (en) * 2019-05-30 2020-12-03 株式会社アサヒテクノ Ground improvement method

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