JP2022010456A - High pressured injection/agitation method - Google Patents

High pressured injection/agitation method Download PDF

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JP2022010456A
JP2022010456A JP2020111073A JP2020111073A JP2022010456A JP 2022010456 A JP2022010456 A JP 2022010456A JP 2020111073 A JP2020111073 A JP 2020111073A JP 2020111073 A JP2020111073 A JP 2020111073A JP 2022010456 A JP2022010456 A JP 2022010456A
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improved body
nozzle
injection
improved
rotation speed
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JP7471041B2 (en
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忠輔 和田
Tadasuke Wada
博之 田中
Hiroyuki Tanaka
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Chemical Grouting Co Ltd
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  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

To provide a technology allowing an improved body with a relatively larger manufacturing diameter to be formed in constant quality.SOLUTION: A high pressured injection/agitation method injecting hardening liquid from each of nozzles at a high pressure to cut soil with high pressured current 48 of the hardening liquid as well as agitating/mixing the cut soil and the hardening liquid when inserting a double tube rod 18 provided with a first nozzle 36 and a second nozzle 38 on a side surface to the ground to be improved and drawing up the double tube rod 18 by rotating or oscillating it to construct an improvement body 54 in the ground comprises steps of: an improvement body diameter expansion step making the high pressured current 48 reach relatively further distance by rotating the double tube rod 18 at a relatively low rotation speed for a predetermined period; and an improvement body quality upgrade step promoting soil stirring with the high pressured current 48 by rotating the double tube rod 18 at a relatively high rotation speed for a predetermined period, which are alternatively carried out.SELECTED DRAWING: Figure 9

Description

この発明は、高圧噴射撹拌工法に係り、特に、高圧噴射撹拌工法の効率化及び改良体の品質向上を同時に可能とする技術に関する。 The present invention relates to a high-pressure injection stirring method, and more particularly to a technique capable of simultaneously improving the efficiency of the high-pressure injection stirring method and improving the quality of an improved body.

地盤改良工法の一つとして、高圧噴射撹拌工法が知られている。
この工法においては、まず地上に地盤改良装置を設置し、その下方の地盤に向けてほぼ鉛直に所定深度までケーシングで削孔する。
ケーシングが所定深度に達したら、ケーシングに代えて二重管ロッド等の注入ロッドを削孔内に挿入し、その先端に装着された噴射装置（造成モニタ）の側面のノズルからセメント系固化材液を半径方向外方に向けて高圧で噴射すると共に、注入ロッドを回転させる。 The high-pressure injection stirring method is known as one of the ground improvement methods.
In this construction method, a ground improvement device is first installed on the ground, and a hole is drilled with a casing almost vertically toward the ground below it to a predetermined depth.
When the casing reaches a predetermined depth, an injection rod such as a double pipe rod is inserted into the hole instead of the casing, and the cement-based solidifying material liquid is inserted from the nozzle on the side of the injection device (creation monitor) attached to the tip of the casing. Is injected at high pressure outward in the radial direction, and the injection rod is rotated.

この結果、固化材液の高圧噴流によって切削された土壌が、固化材液と撹拌混合される。
この注入ロッドを所定の速度で引き上げることで、土壌内に円筒形状の改良体が鉛直方向に造成される。
前記ノズルは一つの場合もあるが、施工の効率化等を図る目的で、注入ロッドの先端に二つ以上のノズルが形成される場合もある。
特開２０１６－２１７１１９ As a result, the soil cut by the high-pressure jet of the solidifying material liquid is stirred and mixed with the solidifying material liquid.
By pulling up this injection rod at a predetermined speed, a cylindrical improved body is created in the soil in the vertical direction.
The nozzle may be one, but two or more nozzles may be formed at the tip of the injection rod for the purpose of improving the efficiency of construction.
JP 2016-217119

この円筒形状の改良体を、平面的に縦横に配列することにより、所定範囲の地盤改良が実現される。
したがって、一定面積の地盤を改良するに当たっては、一本当たりの改良体の造成径（口径）をできるだけ大きく形成することにより、より少ない本数で対象地盤をカバーできることとなり、作業工程の簡素化と作業時間の短縮化が実現できる。 By arranging the improved cylinder-shaped bodies vertically and horizontally in a plane, ground improvement within a predetermined range is realized.
Therefore, when improving the ground of a certain area, by forming the created diameter (caliber) of the improved body as large as possible, it is possible to cover the target ground with a smaller number, which simplifies the work process and works. The time can be shortened.

この改良体の造成径を拡大するための一番簡単な方法は、各ノズルに供給される固化材液の圧力や流量を増やすことにより、ノズルから遠く離れた地盤にまで固化材液を到達させることであるが、そのためには従来よりも大型の高圧ポンプを導入したり、高圧ポンプをノズル毎に複数台設置したりする必要があり、工費のアップを招く結果となる。 The simplest way to increase the build diameter of this improved body is to increase the pressure and flow rate of the solidifying material liquid supplied to each nozzle so that the solidifying material liquid reaches the ground far away from the nozzles. However, for that purpose, it is necessary to introduce a high-pressure pump larger than the conventional one or to install a plurality of high-pressure pumps for each nozzle, which results in an increase in construction cost.

このような事態を回避しながら、改良体の造成径を拡大する一つの方策として、ノズルの回転速度を抑制することが挙げられる。
すなわち、ノズルの回転速度を比較的遅く設定し、土壌の一箇所に対し固化材液を集中的に噴射することにより、従来の設備を利用したままで固化材液の到達距離を伸ばすことが可能となる。 One measure to increase the diameter of the improved body while avoiding such a situation is to suppress the rotation speed of the nozzle.
That is, by setting the rotation speed of the nozzle to be relatively slow and intensively spraying the solidifying material liquid on one part of the soil, it is possible to extend the reach of the solidifying material liquid while using the conventional equipment. Will be.

ただし、このようにノズルの回転速度を低下させると、固化材液の高圧噴流による土壌の攪拌不足が生じやすく、改良体としての十分な品質（強度）が確保できないという問題が生じる。 However, if the rotation speed of the nozzle is reduced in this way, insufficient stirring of the soil due to the high-pressure jet of the solidifying material liquid tends to occur, and there arises a problem that sufficient quality (strength) as an improved body cannot be ensured.

この発明は、このような現状に鑑みて案出されたものであり、所定範囲の地盤改良をより効率的かつ高品質に施工可能とする技術の実現を目的としている。 The present invention has been devised in view of the current situation, and an object of the present invention is to realize a technique that enables more efficient and high-quality construction of ground improvement within a predetermined range.

前記の目的を達成するため、請求項１に記載した高圧噴射攪拌工法は、側面にノズルを備えた注入ロッドを改良対象地盤中に挿入し、当該注入ロッドを回転させながら所定距離ずつ段階的に引き上げる際に、前記ノズルから固化材液を高圧で噴射し、この固化材液の高圧噴流によって土壌を切削すると共に、切削した土壌と固化材液とを攪拌混合し、地盤中に改良体を造成する工法において、前記注入ロッドを比較的低速な回転速度で所定時間回転させ、高圧噴流を比較的遠くまで到達させる改良体径拡張工程と、前記注入ロッドを比較的高速な回転速度で所定時間回転させ、高圧噴流による土壌の攪拌を促進させる改良体高品質化工程が、交互に実行されることを特徴としている。
前記「回転」には、注入ロッドを所定の角度範囲で往復回動させ、固化材液の高圧噴流を揺動させる場合も含まれる。 In order to achieve the above object, in the high-pressure jet stirring method according to claim 1, an injection rod having a nozzle on the side surface is inserted into the ground to be improved, and the injection rod is rotated stepwise by a predetermined distance. When pulling up, the solidifying material liquid is jetted from the nozzle at high pressure, the soil is cut by the high pressure jet of this solidifying material liquid, and the cut soil and the solidifying material liquid are stirred and mixed to create an improved body in the ground. In the construction method, the injection rod is rotated at a relatively low rotation speed for a predetermined time to allow a high-pressure jet to reach a relatively long distance, and the injection rod is rotated at a relatively high rotation speed for a predetermined time. It is characterized in that the improved quality improvement steps of promoting the agitation of the soil by the high-pressure jet are performed alternately.
The "rotation" includes a case where the injection rod is reciprocated within a predetermined angle range to swing a high-pressure jet of the solidifying material liquid.

請求項２に記載した高圧噴射攪拌工法は、請求項１に記載の工法であって、前記改良体径拡張工程と改良体高品質化工程とが、前記注入ロッド引上げの一段階毎に切り替えられることを特徴としている。 The high-pressure injection stirring method according to claim 2 is the method according to claim 1, wherein the improved body diameter expansion step and the improved body quality improvement step are switched for each step of pulling up the injection rod. It is characterized by.

請求項３に記載した高圧噴射攪拌工法は、請求項１または２に記載の工法であって、前記改良体高品質化工程における高圧噴流の少なくとも一部が、一つ前の改良体径拡張工程で形成された改良体層の少なくとも一部と重複するように、前記注入ロッドの引上げ距離が制御されることを特徴としている。 The high-pressure injection stirring method according to claim 3 is the method according to claim 1 or 2, and at least a part of the high-pressure jet in the improved body quality improvement step is the previous improved body diameter expansion step. It is characterized in that the pulling distance of the injection rod is controlled so as to overlap with at least a part of the formed improved body layer.

請求項４に記載した高圧噴射攪拌工法は、請求項１～３に記載の工法であって、前記改良体高品質化工程における前記注入ロッドの単位時間当たりの回転数が、前記改良体径拡張工程における同回転数の４倍以上であることを特徴としている。 The high-pressure injection stirring method according to claim 4 is the method according to claims 1 to 3, wherein the number of rotations of the injection rod per unit time in the improved body quality improvement step is the improved body diameter expansion step. It is characterized in that it is four times or more the same rotation speed in.

この発明に係る高圧噴射撹拌工法にあっては、注入ロッドの回転速度を抑制した改良体径拡張工程において高圧噴流の到達距離を伸ばすことにより、比較的径大な改良体を得ることが可能となる。
また、注入ロッドの回転速度を高速回転に切り替えた改良体高品質化工程においては、土壌の攪拌性に優れた高圧噴流によって、一つ前の改良体径拡張工程で形成された改良体内の残存土塊を有効に攪拌することができ、改良体全体の品質向上を実現可能となる。 In the high-pressure injection stirring method according to the present invention, it is possible to obtain an improved body having a relatively large diameter by extending the reach of the high-pressure jet in the improved body diameter expanding step in which the rotation speed of the injection rod is suppressed. Become.
In addition, in the improved body quality improvement process in which the rotation speed of the injection rod is switched to high-speed rotation, the residual soil mass in the improved body formed in the previous improved body diameter expansion process by the high-pressure jet with excellent soil agitation. Can be effectively agitated, and the quality of the entire improved body can be improved.

以下、添付の図面に従い、この発明の実施形態を説明する。
初めに、図１及び図２に従い、高圧噴射攪拌工法の一般的な手順について説明する。
まず、図１(a)に示すように、地表10に地盤改良装置12を設置し、ケーシング14の先端から削孔水を噴射しながら所定のストローク速度で土壌15内に下降させることにより、計画深度まで縦孔16を穿設する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, the general procedure of the high-pressure injection stirring method will be described with reference to FIGS. 1 and 2.
First, as shown in FIG. 1 (a), a ground improvement device 12 is installed on the ground surface 10 and lowered into the soil 15 at a predetermined stroke speed while injecting drilling water from the tip of the casing 14 to plan the plan. A vertical hole 16 is drilled to a depth.

つぎに、図１(b)に示すように、二重管ロッド18を縦孔16の底部まで建込んだ後、二重管ロッド18の先端側面に装着された噴射装置のノズルから固化材と水の混合物である固化材液を高圧で噴射しながら回転させ、所定のストローク速度で計画深度まで上昇させる。 Next, as shown in FIG. 1 (b), after the double pipe rod 18 is built up to the bottom of the vertical hole 16, the solidifying material is formed from the nozzle of the injection device mounted on the front end side surface of the double pipe rod 18. The solidifying material liquid, which is a mixture of water, is rotated while being injected at high pressure, and is raised to the planned depth at a predetermined stroke speed.

この結果、図１(c)に示すように、土壌と水、固化材の混合物である円柱状の改良体（杭体）26が形成される。
この施工を通じて、土壌と水、固化材の混合物である排泥24が、二重管ロッド18と縦孔16の隙間を経由して地上に圧送され、スライムピット22に貯められる。 As a result, as shown in FIG. 1 (c), a columnar improved body (pile body) 26, which is a mixture of soil, water, and a solidifying material, is formed.
Through this construction, the waste mud 24, which is a mixture of soil, water, and solidifying material, is pumped to the ground through the gap between the double pipe rod 18 and the vertical hole 16 and stored in the slime pit 22.

この施工の完了をもって地盤改良工事の終了とできる場合もあるが、改良体26が所定の品質を下回っている場合には、図２(a)及び(b)に示すように、改良体26が固化する前に二重管ロッド18を前記と同じ深度まで下降させ、二度目、三度目の施工を実施することにより、改良体26の品質の向上が図られる。 In some cases, the completion of this work can be completed as the ground improvement work, but if the improved body 26 is below the specified quality, the improved body 26 will be used as shown in FIGS. 2 (a) and 2 (b). The quality of the improved body 26 can be improved by lowering the double pipe rod 18 to the same depth as described above before solidifying and performing the second and third construction.

図３は、二重管ロッド18の先端に装着されたこの発明に係る噴射装置30の断面図であり、中心に形成された内管32と、その外側に形成された外管34と、第１のノズル36と、第２のノズル38を備えている。
第１のノズル36は、中央開口部36aと、これを取り巻くように形成された周縁開口部36bを備えている。中央開口部36aは、内管32と連通接続されている。また周縁開口部36bは、外管34と連通接続されている。
第２のノズル38も、中央開口部38aと、これを取り巻くように形成された周縁開口部38bを備えている。中央開口部38aは、内管32と連通接続されている。また周縁開口部38bは、外管34と連通接続されている。 FIG. 3 is a cross-sectional view of the injection device 30 according to the present invention mounted on the tip of the double pipe rod 18, in which the inner pipe 32 formed in the center, the outer pipe 34 formed on the outer side thereof, and the first It includes one nozzle 36 and a second nozzle 38.
The first nozzle 36 includes a central opening 36a and a peripheral opening 36b formed around the central opening 36a. The central opening 36a is communicated with the inner pipe 32. The peripheral opening 36b is communicated with the outer pipe 34.
The second nozzle 38 also includes a central opening 38a and a peripheral opening 38b formed to surround it. The central opening 38a is communicated with the inner pipe 32. The peripheral opening 38b is communicated with the outer pipe 34.

図４に示すように、二重管ロッド18の上端に接続された二重管スイベル40を介して、外管34にはエアコンプレッサ42からエアーが高圧で供給されると同時に、内管32には高圧ポンプ44及びスラリープラント46からセメントと水を混練した固化材液が高圧で供給される。
この結果、第１のノズル36及び第２のノズル38からは、固化材液がエアーと共に勢いよく噴射され、高圧噴流48が形成される。 As shown in FIG. 4, air is supplied from the air compressor 42 to the outer pipe 34 at high pressure via the double pipe swivel 40 connected to the upper end of the double pipe rod 18, and at the same time, to the inner pipe 32. The solidifying material liquid, which is a mixture of cement and water, is supplied at high pressure from the high-pressure pump 44 and the slurry plant 46.
As a result, the solidifying material liquid is vigorously ejected from the first nozzle 36 and the second nozzle 38 together with the air, and a high-pressure jet 48 is formed.

二つのノズルを備えた噴射装置の場合、各ノズルの噴射特性は基本的に同等に設定されるのが通常であり、この発明の場合も第１のノズル36と第２のノズル38の噴射特性が同等となるように設定されている。 In the case of an injection device provided with two nozzles, the injection characteristics of each nozzle are usually set to be basically the same, and in the case of the present invention as well, the injection characteristics of the first nozzle 36 and the second nozzle 38 are set. Is set to be equivalent.

つぎに、図５～９に従い、この発明に係る高圧噴射攪拌工法の施工手順について説明する。
まず、図５に示すように、縦孔16（図示省略）の底部に噴射装置30を挿入し、第１のノズル36及び第２のノズル38から同時に固化材液を噴射させると同時に、噴射装置30を所定の速度で回転させる。その際、固化材吐出量・圧力、引き上げ時間は一定とし、１ステップごとに回転数のみを変更する。
ここでは、高圧噴流48の到達距離を延ばすために、噴射装置30の回転速度は比較的遅くなるように、例えば「５回転／分」となるように制御される。この工程を、改良体径拡張工程と称する。 Next, the construction procedure of the high-pressure injection stirring method according to the present invention will be described with reference to FIGS. 5 to 9.
First, as shown in FIG. 5, the injection device 30 is inserted into the bottom of the vertical hole 16 (not shown), and the solidifying material liquid is simultaneously injected from the first nozzle 36 and the second nozzle 38, and at the same time, the injection device. Rotate 30 at a given speed. At that time, the solidifying material discharge amount / pressure and the pulling time are kept constant, and only the rotation speed is changed for each step.
Here, in order to extend the reach of the high-pressure jet 48, the rotation speed of the injection device 30 is controlled to be relatively slow, for example, "5 rotations / minute". This step is referred to as an improved body diameter expansion step.

この低速の回転速度で噴射装置30を所定時間回転させた後、図６に示すように、噴射装置30を１ステップ（例えば２．５cm）引き上げる。
図示の通り、第１のノズル36及び第２のノズル38の下方には、この時点で比較的直径が大きな円形の第１の改良体層50が土壌15中に形成されている。 After rotating the injection device 30 at this low rotation speed for a predetermined time, the injection device 30 is pulled up by one step (for example, 2.5 cm) as shown in FIG.
As shown in the figure, below the first nozzle 36 and the second nozzle 38, a circular first improved body layer 50 having a relatively large diameter at this time is formed in the soil 15.

噴射装置30の第１のノズル36及び第２のノズル38からは依然として高圧噴流48が噴射されているが、前記のステップアップと同時に噴射装置30の回転速度が高速回転（例えば「１００回転／分」）に切り替えられる。
この結果、高圧噴流48の到達距離が短くなる反面、ミキサー効果が上がり、土壌15の攪拌性が格段に向上する。この工程を、改良体高品質化工程と称する。 The high-pressure jet 48 is still injected from the first nozzle 36 and the second nozzle 38 of the injection device 30, but the rotation speed of the injection device 30 rotates at a high speed (for example, "100 rotations / minute" at the same time as the step-up described above. ") Can be switched to.
As a result, the reach of the high-pressure jet 48 is shortened, but the mixer effect is enhanced and the agitation property of the soil 15 is significantly improved. This process is referred to as an improved body quality improvement process.

この改良体高品質化工程においては、高圧噴流48の下辺が部分的に第１の改良体層50の表面と重複するように第１のノズル36及び第２のノズル38の深さ位置が設定されているため、この高速回転噴流によって先に形成されていた第１の改良体層50内に残されていた土塊を有効に攪拌することができる。 In this improved body quality improvement step, the depth positions of the first nozzle 36 and the second nozzle 38 are set so that the lower side of the high-pressure jet 48 partially overlaps the surface of the first improved body layer 50. Therefore, the soil mass left in the first improved body layer 50 previously formed by this high-speed rotary jet can be effectively agitated.

この高速の回転速度で噴射装置30を所定時間回転させた後、図７に示すように、噴射装置30をさらに１ステップ（例えば２．５cm）引き上げる。
図示の通り、第１のノズル36及び第２のノズル38の下方には、比較的直径が小さな円形の第２の改良体層52が土壌15中に形成されている。
この第２の改良体層52は、その下層部分が第１の改良体層50の上層と重複するように形成されている。 After rotating the injection device 30 at this high rotation speed for a predetermined time, the injection device 30 is further pulled up by one step (for example, 2.5 cm) as shown in FIG. 7.
As shown in the figure, below the first nozzle 36 and the second nozzle 38, a circular second improved layer 52 having a relatively small diameter is formed in the soil 15.
The second improved body layer 52 is formed so that the lower layer portion thereof overlaps with the upper layer of the first improved body layer 50.

噴射装置30の第１のノズル36及び第２のノズル38からは依然として高圧噴流48が噴射されているが、前記のステップアップと同時に噴射装置30の回転速度が低速回転に切り替えられる。
この結果、図示の通り高圧噴流48の到達距離が再び長くなる。 Although the high-pressure jet 48 is still injected from the first nozzle 36 and the second nozzle 38 of the injection device 30, the rotation speed of the injection device 30 is switched to low speed rotation at the same time as the step-up.
As a result, as shown in the figure, the reach of the high-pressure jet 48 becomes longer again.

この高速の回転速度で噴射装置30を所定時間回転させた後、図８に示すように、噴射装置30を１ステップ（例えば２．５cm）引き上げる。
図示の通り、第１のノズル36及び第２のノズル38の下方には、この時点で比較的直径が大きな円形の第１の改良体層50の二層目が形成されている。
このステップアップと同時に噴射装置30の回転速度が再度、高速回転に切り替えられ、第２の改良体層52の二層目が形成される。 After rotating the injection device 30 at this high rotation speed for a predetermined time, the injection device 30 is pulled up by one step (for example, 2.5 cm) as shown in FIG.
As shown in the figure, below the first nozzle 36 and the second nozzle 38, a second layer of a circular first improved body layer 50 having a relatively large diameter at this point is formed.
At the same time as this step-up, the rotation speed of the injection device 30 is switched to high-speed rotation again, and the second layer of the second improved body layer 52 is formed.

以上の改良体径拡張工程と改良体高品質化工程を順番に必要回数繰り返すことにより、図９に示すように、比較的径の大きな第１の改良体層50と、比較的径の小さな第２の改良体層52が交互に多数積層配置された改良体54が土壌15中に形成される。
便宜上、第１の改良体層50と第２の改良体層52の境界が明確に区分された状態で図示されているが、実際には第１の改良体層50と第２の改良体層52の境界は明確ではなく、相互に入り混じった状態で存在している。 By repeating the above steps of expanding the diameter of the improved body and improving the quality of the improved body in order as necessary, as shown in FIG. 9, the first improved body layer 50 having a relatively large diameter and the second improved body layer having a relatively small diameter have a relatively small diameter. An improved body 54 in which a large number of improved body layers 52 of the above are alternately laminated is formed in the soil 15.
For convenience, the boundary between the first improved body layer 50 and the second improved body layer 52 is shown in a clearly separated state, but in reality, the first improved body layer 50 and the second improved body layer are shown. The boundaries of 52 are not clear and exist in a mixed state.

前記のように、噴射装置30の回転速度を抑制して高圧噴流48の到達距離を伸ばすことにより、比較的径大な第１の改良体層50を形成することができ、改良体54の全体の径を拡張することが可能となる。
また、噴射装置30の回転速度を１ステップおきで高速回転に切り替え、土壌の攪拌性に優れた高圧噴流48を形成することにより、第１の改良体層50内の残存土塊を有効に攪拌することができ、改良体54の全体の品質を格段に向上させることが可能となる。
さらに、高圧噴流48の高速回転と低速回転を交互に切り替えることによってフラッシング効果が生じ、二重管ロッド18の周りに排泥24が滞留する現象を効果的に解消することも可能となる。 As described above, by suppressing the rotation speed of the injection device 30 and extending the reach of the high-pressure jet 48, the first improved body layer 50 having a relatively large diameter can be formed, and the entire improved body 54 can be formed. It is possible to expand the diameter of.
Further, by switching the rotation speed of the injection device 30 to high-speed rotation every other step to form a high-pressure jet 48 having excellent soil agitation, the residual soil mass in the first improved body layer 50 is effectively agitated. This makes it possible to significantly improve the overall quality of the improved body 54.
Further, the flushing effect is generated by alternately switching between the high-speed rotation and the low-speed rotation of the high-pressure jet 48, and it is possible to effectively eliminate the phenomenon that the waste mud 24 stays around the double pipe rod 18.

高圧噴射攪拌工法の一般的な手順について説明する模式図である。It is a schematic diagram explaining the general procedure of a high pressure injection stirring method. 高圧噴射攪拌工法の一般的な手順について説明する模式図である。It is a schematic diagram explaining the general procedure of a high pressure injection stirring method. 二重管ロッドの先端に装着された噴射装置の断面図である。It is sectional drawing of the injection device attached to the tip of a double tube rod. 地盤改良装置とエアコンプレッサ及び高圧ポンプとの接続関係を示す図である。It is a figure which shows the connection relationship between a ground improvement device, an air compressor and a high pressure pump. この発明に係る高圧噴射攪拌工法の施工過程を説明する図である。It is a figure explaining the construction process of the high pressure injection stirring method which concerns on this invention. この発明に係る高圧噴射攪拌工法の施工過程を説明する図である。It is a figure explaining the construction process of the high pressure injection stirring method which concerns on this invention. この発明に係る高圧噴射攪拌工法の施工過程を説明する図である。It is a figure explaining the construction process of the high pressure injection stirring method which concerns on this invention. この発明に係る高圧噴射攪拌工法の施工過程を説明する図である。It is a figure explaining the construction process of the high pressure injection stirring method which concerns on this invention. この発明に係る高圧噴射攪拌工法の施工過程を説明する図である。It is a figure explaining the construction process of the high pressure injection stirring method which concerns on this invention.

12 地盤改良装置
14 ケーシング
15 土壌
16 縦孔
18 二重管ロッド
26 一般的な改良体
30 噴射装置
32 内管
34 外管
36 第１のノズル
38 第２のノズル
40 二重管スイベル
42 エアコンプレッサ
44 高圧ポンプ
46 スラリープラント
48 高圧噴流
50 第１の改良体層
52 第２の改良体層
54 この発明による改良体 12 Ground improvement equipment
14 Casing
15 soil
16 vertical hole
18 Double tube rod
26 General improvements
30 Injection device
32 inner tube
34 Outer pipe
36 First nozzle
38 Second nozzle
40 double tube swivel
42 Air compressor
44 High pressure pump
46 Slurry plant
48 high pressure jet
50 First improved body layer
52 Second improved body layer
54 Improved body according to the present invention

Claims (4)

側面にノズルを備えた注入ロッドを改良対象地盤中に挿入し、当該注入ロッドを回転させながら所定距離ずつ段階的に引き上げる際に、前記ノズルから固化材液を高圧で噴射し、この固化材液の高圧噴流によって土壌を切削すると共に、切削した土壌と固化材液とを攪拌混合し、地盤中に改良体を造成する工法において、
前記注入ロッドを比較的低速な回転速度で所定時間回転させ、高圧噴流を比較的遠くまで到達させる改良体径拡張工程と、前記注入ロッドを比較的高速な回転速度で所定時間回転させ、高圧噴流による土壌の攪拌を促進させる改良体高品質化工程とが、交互に実行されることを特徴とする高圧噴射攪拌工法。 When an injection rod equipped with a nozzle on the side surface is inserted into the ground to be improved and the injection rod is gradually pulled up by a predetermined distance while rotating, the solidifying material liquid is ejected from the nozzle at high pressure, and this solidifying material liquid is injected. In the construction method of cutting the soil by the high-pressure jet of the above, and stirring and mixing the cut soil and the solidifying material liquid to create an improved body in the ground.
An improved body diameter expansion step in which the injection rod is rotated at a relatively low rotation speed for a predetermined time to allow a high-pressure jet to reach a relatively long distance, and a high-pressure jet is rotated at a relatively high rotation speed for a predetermined time. A high-pressure jet agitation method characterized in that the improved quality improvement process that promotes the agitation of the soil is performed alternately. 前記改良体径拡張工程と改良体高品質化工程とが、前記注入ロッド引上げの一段階毎に切り替えられることを特徴とする請求項１に記載の高圧噴射攪拌工法。 The high-pressure injection stirring method according to claim 1, wherein the improved body diameter expansion step and the improved body quality improvement step can be switched at each step of pulling up the injection rod. 前記改良体高品質化工程における高圧噴流の少なくとも一部が、一つ前の改良体径拡張工程で形成された改良体層の少なくとも一部と重複するように、前記注入ロッドの引上げ距離が制御されることを特徴とする請求項１または２に記載の高圧噴射攪拌工法。 The pulling distance of the injection rod is controlled so that at least a part of the high-pressure jet in the improved body quality improvement step overlaps with at least a part of the improved body layer formed in the previous improved body diameter expansion step. The high-pressure jet stirring method according to claim 1 or 2, wherein the method is characterized by the above. 前記改良体高品質化工程における前記注入ロッドの単位時間当たりの回転数が、前記改良体径拡張工程における同回転数の４倍以上であることを特徴とする請求項１～３の何れかに記載の高圧噴射攪拌工法。 The invention according to any one of claims 1 to 3, wherein the rotation speed of the injection rod per unit time in the improved body quality improving step is four times or more the same rotation speed in the improved body diameter expanding step. High-pressure injection stirring method.
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