JP4804772B2 - Ground improvement device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil improvement device by which lap work of a joint part with an existing improvement body can be carried out easily, surely and in a short time. <P>SOLUTION: The soil improvement device 10 comprises an endless chain 40 having a plurality of excavation bits 41 fitted thereto, a guide frame 30 to which the endless chain is rotatably mounted, a nozzle 50 mounted on the guide frame to inject an improvement material W, a supporting frame 20 supporting the guide frame to be movable in up and down directions, and a running vehicle 22 to which the supporting frame is fitted. After the endless chain is inserted into the ground 7 by moving the guide frame 30 down, the running vehicle is made to run and the endless chain is rotated. A channel M is dug and the improvement material injected through the nozzle and the in-situ soil 8 of the ground are mixed together and stirred by the excavation bits of the rotating endless chain to form an improvement body 9 in the ground. In the soil improvement device 10, the nozzle 50 is swingably mounted on a front end of the guide frame 30. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

The present invention relates to mixing of an improved material such as a solidified material injected from a nozzle and a ground with an in-situ in situ soil through excavation protrusions such as a plurality of excavation bits of an infinite end moving body such as a rotating endless chain performing stirring about ground improvement equipment such as underground continuous wall Construction apparatus adapted to construct a modified body of a continuous wall or the like in the ground.

  As this kind of underground continuous wall construction apparatus, there is an apparatus shown in FIGS. 19A to 19C (see, for example, Patent Document 1).

  As shown in FIG. 19A, the underground continuous wall forming apparatus 1 is provided so that the endless chain cutter 3 can be driven up and down with respect to the traveling vehicle 2.

Then, as shown in FIG. 19 (b), the endless chain cutter 3 is pushed down to a desired depth of the ground 7, and then the traveling vehicle 2 is moved in the direction of arrow I. As a result, while excavating the ground 7, as shown in FIG. 19C, the hardened liquid 6 such as cement milk is ejected through the pipe 5 provided in the guide post 4 of the endless chain cutter 3. At the present position, the earth and sand 8 and the hardening liquid 6 are mixed to form a soil cement wall body 9 to construct an underground continuous wall.
Japanese Patent Laid-Open No. 5-280043 Japanese Patent Laid-Open No. 5-17946

  However, in the conventional underground continuous wall construction apparatus 1, as shown in FIG. 20 (a), when a new soil cement wall body 9 ′ is constructed on the existing solid cement wall body 9, Unless the seam portion (joint portion) 9a of the solid soil cement wall body 9 is slightly shaved into a concave shape, it is difficult to ensure the water shielding property, and the construction is complicated. Furthermore, in order to perform the construction of the underground continuous wall by the underground continuous wall construction apparatus 1 at another location, the endless chain cutter 3 must be disassembled from the traveling vehicle 2 and assembled at each new construction location. The work was complicated.

Therefore, the present invention has been made to solve the above-mentioned problems, and can lap construction of a joint portion with an existing improved body easily and reliably in a short time, and can be performed without disassembling. and to provide a good ground improvement equipment economical capable changing the location.

The invention according to claim 1 is a vertical annular endless moving body having a plurality of excavation projections attached thereto, the annular infinite end moving body provided rotatably, and a guide frame extending in the vertical direction, and the guide A nozzle provided on the frame for injecting the improvement material; a support frame that supports the guide frame so as to be movable up and down; and a traveling vehicle to which the support frame is attached; and the guide frame is lowered to enter the ground. After the infinite end moving body is inserted, the traveling vehicle is driven and the infinite end moving body is rotated, and a groove is excavated through the plurality of excavation protrusions of the rotating infinite end moving body and injected from the nozzle. In the ground improvement device in which an improved body is formed in the ground by mixing and agitating the improvement material and the in-situ soil of the ground, the guide frame is supported in a freely movable manner. Wherein from the standing state to the support frame with respect to the traveling vehicle that is provided movably in the horizontal tilting state.

The invention of claim 2, met soil improvement apparatus according to claim 1, characterized in that the said nozzle guide frame disposed for free swinging.

The invention of claim 3, met soil improvement apparatus according to claim 1, characterized by providing freely reciprocating the nozzle transversely serial guide frame.

The invention according to claim 4 is the ground improvement device according to claim 1 , characterized in that the nozzle is provided in the guide frame in a slit shape in the lateral direction .

As described above, according to the ground improvement device of the first aspect of the present invention, the support frame supporting the guide frame so as to be movable up and down is provided so as to be movable from the standing state to the horizontal tilted state with respect to the traveling vehicle. Therefore, the construction place can be changed without disassembling.

According to the ground improvement device of the second aspect of the present invention, the vertical and annular infinite end movable body having a plurality of excavation projections is rotatably provided, and the nozzle for injecting the improvement material onto the guide frame extending in the vertical direction the by providing freely swing, by injecting the modifying material from a nozzle rocking the junction of the existing improvement body can perform its wrap construction easily and reliably in a short time.

According to the ground improvement device of the invention of claim 3, the vertical and annular infinite end movable body to which a plurality of excavation protrusions are attached is rotatably provided, and the improvement material is injected into the guide frame extending in the vertical direction. the by providing reciprocally move laterally, be performed in a short time the wrap construction easily and reliably by injection of the modifying material from a nozzle reciprocates transversely to the junction between the existing improvement body it can.

According to the ground improvement device of the invention of claim 4, a vertical annular endless moving body having a plurality of excavation protrusions is rotatably provided, and a nozzle for injecting the improvement material onto a guide frame extending in the vertical direction By providing a slit in the lateral direction, the improvement material is sprayed from the nozzle provided in the slit direction in the lateral direction at the joint with the existing improved body, and the lap construction can be performed easily and reliably in a short time. the Ru can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing an underground continuous wall generating apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the underground continuous wall generating apparatus, and FIG. 3 is used for the underground continuous wall generating apparatus. FIG. 4 is a cross-sectional view of a moving frame of the support frame, FIG. 5 is a cross-sectional view of a fixed frame of the support frame, and FIG. 6 is a side view showing a state before the support frame is lowered. 7 is a side view showing a state in which the moving frame of the support frame is raised by one pitch, and FIG. 8 is a side view showing a state in which the moving frame of the support frame is locked and the fixed frame is raised by one pitch. 9 is a side view showing a state where the fixed frame of the support frame is locked and the moving frame is raised by one pitch, FIG. 10 is an explanatory view of the nozzle arrangement portion of the underground continuous wall forming device, and FIG. 11 is the guide frame It is attached to an annular endless chain that is rotatably supported by FIG. 12 is a perspective view of another excavation bit attached to the annular endless chain, FIG. 13 is a side view showing the guide frame standing on the ground, and FIG. FIG. 15 is a side view showing a state in which the guide frame is tilted horizontally. FIG.

  As shown in FIGS. 1 and 2, the underground continuous wall forming device (ground improvement device) 10 includes a construction machine main body (traveling vehicle) 11. The construction machine main body 11 is turnable via a turntable 12 and can be run via a pair of crawlers 13 and 13. As shown in FIGS. 1, 2, and 13 to 15, a support frame 20 is attached to the front center of the construction machine body 11 so as to be able to stand up and tilt.

  As shown in FIGS. 1 to 5, the support frame 20 includes a fixed frame 21 having a square cross section and recesses 22 a on both sides of a guide plate 22 having an H cross section extending downward from the rear center of the fixed frame 21. , 22a is provided with a moving frame 24 having a U-shaped cross section that moves in the vertical direction by sliding the convex portions 24b, 24b on both sides. A base end 23 a of an arc-shaped arm plate 23 is fixed to the upper side of the back surface of the guide plate 22 at the center of the rear portion of the fixed frame 21, and the tip 23 b of the arm plate 23 attaches the support shaft 14 to the construction machine main body 11. It is supported via a pivot. A tip of the piston rod 15a of the tilting hydraulic cylinder 15 is pivotally supported on the lower side of the back surface of the guide plate 22. A base end portion 15 b of the tilting hydraulic cylinder 15 is pivotally supported at the front center of the construction machine main body 11. The support frame 20 can stand up and tilt with respect to the construction machine main body 11 by expansion and contraction of the piston rod 15 a of the tilting hydraulic cylinder 15.

  A pair of hydraulic cylinders 25 and 25 for raising and lowering the guide frame are interposed between both sides of the fixed frame 21 of the support frame 20 and both sides of the moving frame 24. The base end portion 25 a of each hydraulic cylinder 25 is pivotally supported on the side portion of the fixed frame 21, and the distal end portion of the piston rod 25 b of each hydraulic cylinder 25 is pivotally supported on the side portion of the moving frame 24. It is. Further, as shown in FIGS. 3 and 5, circular round holes 21 a are formed on both sides of the fixed frame 21, and locking portions are provided on the side portions of the fixed frame 21 around the round holes 21 a. A hydraulic cylinder 26 is attached. A lock pin 26b is fixed to the tip of the piston rod 26a of the hydraulic cylinder 26 for locking, and the lock pin 26b can be stored in the round hole 21a when the piston rod 26a is retracted. Further, as shown in FIG. 3 and FIG. 4, circular round holes 24 a are formed on both sides of the moving frame 24, and the side of the moving frame 24 around each round hole 24 a is used for locking. A hydraulic cylinder 27 is attached. A lock pin 27b is fixed to the tip of the piston rod 27a of the locking hydraulic cylinder 27, and the lock pin 27b can be stored in the round hole 24a when the piston rod 27a is retracted. 5 denotes a cylindrical bush embedded in the side portion so as to communicate with the inside of the round hole 21a on the side portion of the fixed frame 21, and reference numeral 29 in FIG. It is a cylindrical bush embedded in the side portion so as to communicate with the inside of the round hole 24a on the side portion.

  Further, as shown in FIGS. 1 to 9, a guide frame 30 extending in the vertical direction is supported in the fixed frame 21 and the moving frame 24 of the support frame 20 so as to be movable up and down. In the center between both sides of the guide frame 30, through holes 31 having a circular cross section are formed at equal intervals in the vertical direction. A pair of cylindrical bushes 32 and 32 are embedded on both sides of each through hole 31 so as to communicate with each through hole 31. In each of the pair of bushes 32, 32, a lock pin 26b of the hydraulic cylinder 26 for locking the fixed frame 21 and a lock pin 27b of the hydraulic cylinder 27 for locking the moving frame 24 can be stored and withdrawn, respectively. Yes.

  10 to 12, for example, three guide convex portions 33 are provided on the front and rear sides of the guide frame 30, and each guide convex portion 33 has a vertical, annular endless chain ( Infinite end moving bodies) 40 are supported so as to be freely rotatable. As shown in FIG. 1, each endless chain 40 includes a drive sprocket 35 that is rotated by a chain drive motor 34 provided at the upper end portion of the guide frame 30 and a driven sprocket 36 provided at the lower end portion of the guide frame 30. It is spanned between. Further, as shown in FIGS. 10 to 12, a plurality of excavation bits (excavation projections) 41 are attached to each endless chain 40 located on both sides at equal intervals. A plurality of excavation bits (excavation protrusions) 42 are attached to the endless chain 40 located at the center at equal intervals.

  Further, as shown in FIGS. 3 and 10, an opening 37 is provided at the tip (lower end) of the guide frame 30, and a solidified liquid (improvement material) W such as cement milk is injected into the opening 37. A nozzle 50 is provided so as to be swingable. That is, the nozzle body 51 of the nozzle 50 is supported by the mounting frame 38 in the opening 37 through the support shaft 52 so as to be swingable. Further, a base end portion 53 a of a swing hydraulic cylinder 53 is pivotally supported on the mounting frame 38, and a base end portion 51 a of a nozzle body 51 is pivotally supported at the tip of a piston rod 53 b of the hydraulic cylinder 53. It is. The nozzle body 51 is swung horizontally around the support shaft 52 by the expansion and contraction of the piston rod 53b of the hydraulic cylinder 53. The nozzle injection port 51 b of the nozzle body 51 is located in the opening 37. Further, a tube 54 for supplying a solidified liquid W such as cement milk is connected to the middle part of the nozzle body 51.

  According to the underground continuous wall forming apparatus 10 of the above embodiment, when the underground continuous wall (improved body) 9 is constructed on the ground 7, first, the guide is provided by the movement of the fixed frame 21 and the moving frame 24 of the support frame 20. The frame 30 is lowered and the endless chain 40 is inserted into the ground 9.

  The lowering operation of the guide frame 30 at this time will be described with reference to FIGS. As shown in FIG. 6, at the lowest position of the guide frame 30, the lock pin 26 b of each hydraulic cylinder 26 of the fixed frame 21 of the support frame 20 is inserted into the bush 32 in the through hole 31 of the guide frame 30 and locked. It is in a state (locked state shown in FIG. 5). Further, the lock pin 27b of each hydraulic cylinder 27 of the moving frame 24 is inserted into the bush 32 in the through hole 31 of the guide frame 30 and is locked (the locked state shown in FIG. 4). In both the locked states, the piston rod 25b of each hydraulic cylinder 25 for raising and lowering the guide frame extends. From this state, the lock pin 27b of each hydraulic cylinder 27 of the moving frame 24 of the support frame 20 is withdrawn from the bush 32 in the through hole 31 of the guide frame 30 to the unlocked state, and as shown in FIG. The piston rod 25b of each hydraulic cylinder 25 for raising and lowering the frame is contracted, and the moving frame 24 is moved upward by one pitch along the guide plate 22.

Next, the lock pins 27b of the hydraulic cylinders 27 of the moving frame 24 are locked, and the lock pins 26b of the hydraulic cylinders 26 of the fixed frame 21 are released. extend the piston rod 25b, as shown in FIG. 8, along the moving frame 2 4 the guide plate 22 is moved towards under one pitch. Thereafter, the lock pins 26b of the hydraulic cylinders 26 of the fixed frame 21 are brought into the locked state, and the lock pins 27b of the hydraulic cylinders 27 of the moving frame 24 are released from the locked state. As shown in FIG. When the piston rod 25b of each hydraulic cylinder 25 is contracted, the guide frame 30 is lowered by two pitches. By sequentially repeating this operation, the guide frame 30 is lowered to a predetermined depth in the ground 7. When the guide frame 30 is moved upward, the reverse operation is repeated.

  As shown in FIG. 1, after the guide frame 30 is lowered to a predetermined depth in the ground 7, the construction machine main body 11 travels in the lateral direction and the endless chain 40 is rotated. At this time, the excavation of the groove M through a plurality of excavation bits 41, 42 attached to the rotating endless chain 40 and the mixing / stirring of the solidified liquid W sprayed from the nozzle 50 and the in-situ soil 8 of the ground 7 are performed. The continuous wall 9 of the soil cement wall is efficiently created in the ground 7.

  As shown in FIG. 20 (b), when lap construction is performed so that a new underground continuous wall 9 'is joined to the existing solid continuous underground wall 9, the existing underground continuous wall 9 The endless chain 40 to which the plurality of excavation bits 41 and 42 are attached is rotated and inserted into the ground 7 of the joint portion (joint portion) while being lowered.

  Next, the guide frame 30 is pulled out in a state where the rotation of the endless chain 40 is stopped. When the guide frame 30 is pulled out, the nozzle 50 is swung through the hydraulic cylinder 53 to inject the solidified liquid W. Then, the solidification liquid W is sprayed to the ground at the joint portion between the existing solid continuous wall 9 and the lapping is performed. At this time, unlike the conventional example shown in FIG. 20 (a), it is not necessary to cut the seam portion 9a of the existing solid cement wall body 9 into a concave shape, and the seam with the existing solid continuous underground wall 9 is obtained. The lap construction of the part can be performed easily and reliably in a short time. Moreover, since the solidification liquid W can be efficiently injected to the joint part with the existing solid continuous underground wall 9 to the ground, it is possible to improve the economic efficiency of the lap construction and to improve the existing solid continuous underground. It is possible to sufficiently ensure the water shielding property of the joint portion with the wall 9.

  Further, as shown in FIGS. 13 to 15, the guide frame 30 is moved from the standing state shown in FIG. 13 to the FIG. By making the horizontal tilt state shown, the construction site can be changed without disassembling, as in the prior art. When the guide frame 30 is tilted, the guide frame 30 is lowered with a slight inclination as shown in FIG. When the center of gravity of the guide frame 30 is aligned with the center between the pair of fixed frames 21 and the movable frame 24 of the support frame 20, the piston rod 15 a of the hydraulic cylinder 15 for tilting is extended, and horizontally above the construction machine main body 11. Defeat. Thereby, the fall of the construction machine main body 11 can be prevented.

  As a result, it is not necessary to disassemble the guide frame 30 etc. from the construction machine main body 11 as in the prior art when performing the construction of the underground continuous wall 9 by the underground continuous wall constructing apparatus 10 in another place. The machine body 11 can be transported by traveling to a new construction place via a pair of crawlers 13 and 13. Thus, since a construction place can be changed easily, the movement time of construction can be shortened, and the underground continuous wall 9 can be constructed efficiently and at low cost.

  FIG. 16 is an explanatory diagram of a nozzle arrangement portion of an underground continuous wall forming apparatus according to another embodiment of the present invention.

  In this other embodiment, a pair of nozzles 55, 55 for injecting a solidified liquid (improvement material) W such as cement milk into the opening 37 provided at the tip (lower end) of the guide frame 30 is reciprocated in the lateral direction. It is provided freely.

  That is, a pin 56 protrudes from the upper surface of the nozzle body 55 a of each nozzle 55, and the pin 56 is swingably supported on the base side through the support shaft 52 on the mounting frame 38. The link 57 is slidably supported in the long hole 57a at the tip. A pin 57 is pivotally supported at the base end 57 b of each swing link 57 at the tip of the piston rod 53 b of the swing hydraulic cylinder 53. A base end portion 53 a of the swing hydraulic cylinder 53 is pivotally supported on the mounting frame 38.

  The pair of nozzles 55, 55 is moved along the guide 58 in the horizontal direction by swinging each swing link 57 in the horizontal direction around the support shaft 52 by the expansion and contraction of the piston rod 53 b of each hydraulic cylinder 53. Are provided so as to be reciprocally movable. The nozzle injection port 55b of each nozzle body 55a is located in the opening 37. A tube 54 for supplying a solidified liquid W such as cement milk is connected to the rear part of the nozzle body 55a.

  In this other embodiment, as in the previous embodiment, when the guide frame 30 is pulled out while the rotation of the endless chain 40 is stopped, the pair of nozzles 50 and 50 are moved back and forth in the lateral direction to cause the solidified liquid W As shown in FIG. 20 (b), the solidified liquid W is sprayed to the ground at the joint portion between the existing solid continuous wall 9 and lapping is performed. At this time, unlike the conventional example shown in FIG. 20 (a), it is not necessary to cut the seam portion 9a of the existing solid cement wall body 9 into a concave shape, and the seam with the existing solid continuous underground wall 9 is obtained. The lap construction of the part can be performed easily and reliably in a short time. Moreover, since the solidification liquid W can be efficiently injected to the joint part with the existing solid continuous underground wall 9 to the ground, it is possible to improve the economic efficiency of the lap construction and to improve the existing solid continuous underground. It is possible to sufficiently ensure the water shielding property of the joint portion with the wall 9.

  FIG. 17 (a) is a perspective view of a nozzle arrangement portion of an underground continuous wall forming apparatus according to another embodiment of the present invention, and FIG. 17 (b) is a perspective view of a nozzle according to another embodiment of the present invention.

  In this other embodiment, the nozzle injection port 59a of the nozzle 59 for injecting solidified liquid (improvement material) W such as cement milk into the opening 37 provided at the tip (lower end) of the guide frame 30 is slit in the lateral direction. It is provided to extend in a shape. A tube 54 for supplying a solidified liquid W such as cement milk is connected to a rear portion 59b of the nozzle 59 extending in a slit shape in the lateral direction.

  As in the above embodiments, when the guide frame 30 is pulled out with the rotation of the endless chain 40 stopped, the nozzle injection port of the nozzle 59 that extends in a slit shape in the horizontal direction and is exposed from the opening 37 is used. By injecting the solidified liquid W from 59a, as shown in FIG. 20B, the solidified liquid W is sprayed to the ground at the joint portion between the existing solid continuous wall 9 and lapping is performed. At this time, unlike the conventional example shown in FIG. 20 (a), it is not necessary to cut the seam portion 9a of the existing solid cement wall body 9 into a concave shape, and the seam with the existing solid continuous underground wall 9 is obtained. The lap construction of the part can be performed easily and reliably in a short time. Moreover, since the solidification liquid W can be efficiently injected to the joint part with the existing solid continuous underground wall 9 to the ground, it is possible to improve the economic efficiency of the lap construction and to improve the existing solid continuous underground. It is possible to sufficiently ensure the water shielding property of the joint portion with the wall 9.

  In addition, according to each said embodiment, although the guide frame 30 was inserted vertically in the ground 7, as shown in FIG. 18, the guide frame 30 is inserted diagonally in the ground 7, and the underground continuous wall 9 is made into You may construct. In each of the above embodiments, the guide frame is pulled out in a state in which the rotation of the endless chain is stopped when the solidified liquid is sprayed to the ground at the joint portion with the existing solid continuous wall and the lap construction is performed. However, the solidified liquid may be ejected while rotating the endless chain, or the solidified liquid may be ejected when inserted into the ground of the guide frame. Furthermore, although the nozzle for injecting the solidified liquid is provided in the opening provided at the tip (lower end) of the guide frame, a plurality of nozzles may be provided from the tip of the guide frame to the upper part. Of course, it is not limited to the solidified liquid.

It is a side view which shows the underground continuous wall construction apparatus of embodiment of this invention. It is a top view of the above-mentioned underground continuous wall construction device. It is a perspective view of the guide frame and support frame which are used for the above-mentioned underground continuous wall construction device. It is sectional drawing of the moving frame of the said support frame. It is sectional drawing of the fixed frame of the said support frame. It is a side view which shows the state before the said support frame descend | falls. It is a side view which shows the state which raised the moving frame of the said support frame 1 pitch. It is a side view which shows the state which locked the moving frame of the said support frame and raised the fixed frame 1 pitch. It is a side view which shows the state which locked the fixed frame of the said support frame and raised the moving frame 1 pitch. It is explanatory drawing of the nozzle arrangement | positioning part of the said underground continuous wall construction apparatus. It is a perspective view of the excavation bit attached to the cyclic | annular endless chain rotatably supported by the said guide frame. It is a perspective view of the other excavation bit attached to the said annular endless chain. It is a side view which shows the state which raised the said guide frame on the ground. It is a side view which shows the state in the middle of inclination of the said guide frame. It is a side view which shows the state which inclined the said guide frame horizontally. It is explanatory drawing of the nozzle arrangement | positioning part of the underground continuous wall construction apparatus of other embodiment of this invention. (A) is a perspective view of the nozzle arrangement | positioning part of the underground continuous wall construction apparatus of another embodiment of this invention, (b) is a perspective view of the nozzle of another embodiment of this invention. It is a side view which shows the state which improves the ground diagonally with the said underground continuous wall construction apparatus. (A)-(c) is explanatory drawing which shows the ground improvement process by the conventional underground continuous wall construction apparatus. (A) is explanatory drawing of the joint part of the underground continuous wall by the conventional underground continuous wall construction apparatus, (b) is explanatory drawing of the joint part of the underground continuous wall by this invention.

Explanation of symbols

10 Underground continuous wall construction equipment (ground improvement equipment)
11 Construction machine body (traveling vehicle)
20 Support frame 30 Guide frame 40 Endless chain (infinite end moving body)
41, 42 Drilling bit (drilling protrusion)
50, 55, 59 Nozzle 7 Ground 8 Soil 9 Soil cement wall (underground continuous wall)
W Solidified liquid (improved material)
M groove

Claims (4)

A vertical annular endless moving body with a plurality of excavation protrusions, the annular infinite end moving body provided rotatably, and a guide frame extending in the vertical direction, and provided on the guide frame. A nozzle that injects the guide frame, a support frame that supports the guide frame so as to be movable up and down, and a traveling vehicle to which the support frame is attached.
After the guide frame is lowered and the infinite end moving body is inserted into the ground, the traveling vehicle is driven and the infinite end moving body is rotated, and a plurality of excavation protrusions of the rotating endless end moving body are provided. In the ground improvement device in which the improved body is created in the ground by performing mixing excavation of the improved material sprayed from the nozzle and the original soil of the ground through excavation of the groove through
A ground improvement device, wherein the support frame supporting the guide frame so as to be movable up and down is provided so as to be movable from a standing state to a horizontal tilted state with respect to the traveling vehicle. The ground improvement device according to claim 1,
A ground improvement device, wherein the nozzle is swingably provided on the guide frame. The ground improvement device according to claim 1,
A ground improvement device, wherein the guide frame is provided with the nozzle so as to be reciprocally movable in a lateral direction. The ground improvement device according to claim 1,
A ground improvement device in which the nozzle is provided in the guide frame in a slit shape in the lateral direction.

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