JP6401570B2 - Ground improvement device and ground improvement method using the device - Google Patents

Description

  The present invention relates to a ground improvement device suitable for use in creating a wide wall-like improvement body vertically or horizontally, or improving the ground directly under an existing structure, and a ground improvement method using the device.

  As this kind of ground improvement device, what is shown in FIG. 25 and FIG. 26 is known (for example, refer patent document 1).

  As shown in FIG. 25 and FIG. 26, the ground improvement device 1 has a construction machine 2, and a vertical arm 4 is provided at the tip 3 a of the swing arm 3 of the construction machine 2. A stir mixer 5 that is inserted into the ground 9 and stirs and mixes with the in-situ soil while supplying the cement-based solidified material is rotatably supported at the tip 4a of the vertical arm 4.

  The stirring mixer 5 is configured to circulate and drive an endless chain 6 equipped with stirring blades (not shown) between a pair of sprockets 7.7. Further, as shown in FIG. 26, the rear portion of the agitating mixer 5 extends backward in the ground 9, so that the entire agitating mixer 5 is pushed forward by taking a reaction force from the rear ground. A forward jack 8 provided with a reaction force plate 8a is mounted.

JP 2007-162337 A (FIGS. 6 and 7)

  However, in the conventional ground improvement device 1, when the stirring mixer 5 vertically penetrates into the ground 9, the rotation direction of the chain 6 is only one direction. It was necessary to penetrate while correcting the inclination.

  In addition, since the stirring mixer 5 can be improved only in a uniform range in the vertical (depth) direction (a range in which the stirring mixer 5 is in a horizontal posture), an extra improvement portion (hereinafter referred to as “extra improvement portion”) is provided. It was easy to occur.

  Furthermore, since the forward jack 8 provided with the reaction force plate 8a is indispensable for pushing the entire stirring mixer 5 forward, the entire apparatus is expensive and large.

  Therefore, the present invention has been made to solve the above-mentioned problems, and can easily and reliably penetrate the stirring mixer vertically with respect to the ground, and can freely improve the ground improvement in the depth direction. It is an object of the present invention to provide a small ground improvement device that can be reduced to a small improvement portion as much as possible and a ground improvement method using the device.

Invention of Claim 1 is the ground improvement apparatus provided with the stirring mixer which stirs and mixes with an in-situ soil, supplying the improvement material penetrated in the ground at the front-end | tip part of the attachment of a construction machine, The tip of the said attachment The stirring mixer is fixed to the section, and at least one movable-side stirring mixer that moves in a direction away from the fixed-side stirring mixer in a direction away from the driving means is provided . The machine is driven between a drive shaft having a drive sprocket driven by a motor, at least one driven shaft having a driven sprocket driven by the drive sprocket of the drive shaft, and between the drive sprocket and the driven sprocket. An endless chain, a plurality of bits attached to the endless chain at predetermined intervals, and the drive shaft and the driven shaft at predetermined intervals. It is constituted by a plurality of stirring blades attached to said.

  Invention of Claim 2 is the ground improvement apparatus of Claim 1, Comprising: The movable side stirring mixer which moves via a drive means in the direction away from the state which approached with respect to the said movable side stirring mixer One more machine is provided.

  Invention of Claim 3 is the ground improvement apparatus of Claim 1, Comprising: The stirring mixer of the movable side which moves via a drive means in the direction away | separated from the approached state so that the stirring mixer of the fixed side may be pinched | interposed A pair is provided.

A fourth aspect of the present invention is the ground improvement device according to any one of the first to third aspects, wherein the driving means is a hydraulic cylinder.

The invention of claim 5 is a ground improvement method using a ground improvement device equipped with a stirrer mixing device that stirs and mixes with the in-situ soil while being fed into the ground and supplying the improvement material to the tip of the attachment of the construction machine. The fixed-side stirring mixer fixed to the tip of the attachment and the movable-side stirring mixer provided close to the fixed-side stirring mixer are operated together in the ground. The fixed-side stirring mixer is then moved away from the fixed-side stirring mixer while the operation of the fixed-side stirring mixer is stopped to obtain a reaction force. The ground is improved by moving in the direction and stirring and mixing while pouring the improving material into the original soil of the ground.

The invention according to claim 6 is the ground improvement method according to claim 5 , wherein the second movable unit further moves in a direction away from the movable side stirring mixer from the state approaching the movable side stirring mixer. The ground in situ soil is further improved by the side stirring mixer.

A seventh aspect of the present invention is the ground improvement method according to the fifth aspect of the present invention, wherein a pair of movable-side agitators move in a direction away from each other through the driving means from a state of being close to the fixed-side agitator mixer. The ground is improved for each of the soils of the ground located on both sides of the fixed-side stirring mixer by a mixer.

As described above, according to the ground improvement device of the invention of the first aspect, the stirring mixer is fixed to the distal end portion of the attachment of the construction machine, and the driving means from the state approaching the stirring mixer on the fixed side. By providing at least one movable-side stirrer / mixer that moves in a direction away from each other, the width of ground improvement can be freely changed. Thereby, a surplus improvement part can be reduced as much as possible, and cost reduction can be achieved by that much. In particular, each agitator and mixer includes a drive shaft provided with a drive sprocket driven by a motor, at least one driven shaft provided with a driven sprocket driven by the drive sprocket of the drive shaft, the drive sprocket and the driven sprocket. An endless chain spanned between, a plurality of bits attached to the endless chain at predetermined intervals, and a plurality of stirring blades attached to the drive shaft and the driven shaft at predetermined intervals. By configuring the endless chain of the stirrer mixer on the movable side and the endless chain of the stirrer mixer on the fixed side to reversely rotate, the stirrer mixer can be easily and reliably penetrated vertically into the ground. Can do. In addition, when the ground is improved, the fixed-side stirring mixer can function as a reaction force plate.

  According to the ground improvement device of the second aspect of the present invention, there is further provided one movable-side stirring mixer that moves via the driving means in a direction away from the state of approaching the movable-side stirring mixer. Thus, the range of ground improvement can be further expanded. That is, the construction range can be widened by a plurality of stirring mixers, and the range that can be improved at once can be increased.

  According to the ground improvement device of the invention of claim 3, by providing a pair of movable-side stirring mixers that move via the drive means in a direction away from the approached state so as to sandwich the fixed-side stirring mixer, The range of ground improvement can be further expanded. That is, the construction range can be widened by a plurality of stirring mixers, and the range that can be improved at once can be increased.

According to the ground improvement device of the invention of the fourth aspect , since the drive means is a hydraulic cylinder, the width of the ground improvement can be freely changed with a simple structure.

According to the ground improvement method of the invention of claim 5 , the fixed-side stirring mixer fixed to the tip of the attachment, and the movable-side stirring provided close to the fixed-side stirring mixer Penetration to the specified depth in the ground while working together with the mixer, then stop the operation of the fixed-side stirrer mixer to obtain reaction force, while stirring the movable-side stirrer mixer on the fixed side The width of ground improvement can be changed freely by moving it in a direction away from the mixer and stirring and mixing it while injecting the improvement material into the soil in the ground. Can be reduced as much as possible, and the cost can be reduced accordingly.

According to the ground improvement construction method of the invention of claim 6 , by another movable stirring mixer that further moves in a direction away from the movable stirring mixer from the state approaching the driving mixer, Furthermore, the ground improvement can be further broadened by improving the soil in the ground in the back.

According to the ground improvement method of the invention of claim 7 , the fixed side stirring mixer is moved by the pair of movable side stirring mixers that move in the direction away from each other through the driving means from the approached state so as to sandwich the fixed side stirring mixer. The ground improvement can be further broadened by improving the soil in the original soil located on both sides of the mixing mixer.

It is a side view which shows the ground improvement apparatus of 1st Embodiment of this invention. It is a front view of the ground improvement device. (A) is a front view of the stirring mixer of the ground improvement device, and (b) is a side view of the stirring mixer. It is expansion explanatory drawing of the principal part of the said stirring mixer. 3A is a cross-sectional view taken along the line AA in FIG. 3A, FIG. 3B is a cross-sectional view taken along the line BB in FIG. 3A, and FIG. Explanatory drawing which shows the state which piping extended, (d) is explanatory drawing which shows the state which the piping contracted. It is a side view which shows the state which each stirring mixer of the movable side and fixed side of the said ground improvement apparatus penetrated into the ground. It is a side view which shows the initial state in which the said stirring mixer of the movable side translates ahead. It is a side view which shows the state in the middle of the said movable side stirring mixer translating forward. It is a side view which shows the state which the said stirring mixer of the movable side finished translating forward. It is explanatory drawing which shows the state of the ground improvement by the parallel movement ahead of the said stirring mixer of the movable side. It is a side view which shows the state which each said stirring mixer of the said movable side and fixed side penetrated into the ground. It is a side view which shows the initial state which the said stirring mixer of the movable side rocks upwards. It is a side view which shows the state in the middle of the said movable side stirring mixer swinging upwards. It is a side view which shows the state which the said stirring mixer of the movable side finished swinging upwards. It is explanatory drawing which shows the state of the ground improvement by the rocking | fluctuation upward of the said stirring mixer of the said movable side. It is a side view which shows the state which each stirring mixer of the movable side and fixed side of the ground improvement apparatus of 2nd Embodiment of this invention penetrated into the ground. It is a side view which shows the state which the one side stirring mixer of the said 2nd Embodiment has finished translating forward. It is a side view which shows the state where the other movable side stirring mixer of the said 2nd Embodiment finished the parallel movement further forward. It is explanatory drawing which shows the state of the ground improvement by the parallel movement to the front of the stirring mixer of each movable side of the said 2nd Embodiment. It is a side view which shows the state which each stirring mixer of the movable side and fixed side of the ground improvement apparatus of 3rd Embodiment of this invention penetrated into the ground. It is a side view which shows the state which the stirring mixer of each movable side of the both sides of the said 3rd Embodiment finished translating back and forth. It is explanatory drawing which shows the state of the ground improvement by the parallel movement to the front-back direction of each movable side stirring mixer of the both sides of the said 3rd Embodiment. It is a side view which shows the state which the stirring mixer of each movable side of the both sides of the said 3rd Embodiment finished swinging upwards. It is explanatory drawing which shows the state of the ground improvement by the rocking | fluctuation upward of each movable side stirring mixer of the both sides of the said 3rd Embodiment. It is explanatory drawing which shows the state which inserted the conventional stirring mixer into the prior improvement part by the vertical attitude | position. It is explanatory drawing which shows the state which made the said conventional stirring mixer the horizontal attitude | position.

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

<First Embodiment>
1 is a side view showing a ground improvement device according to a first embodiment of the present invention, FIG. 2 is a front view of the ground improvement device, FIG. 3A is a front view of a stirring mixer of the ground improvement device, FIG. (B) is a side view of the stirring mixer, FIG. 4 is an enlarged explanatory view of the main part of the stirring mixer, FIG. 5 (a) is a cross-sectional view taken along line AA in FIG. 3 (a), and FIG. 5 (b) is a cross-sectional view taken along the line BB in FIG. 3 (a), FIG. 5 (c) is an explanatory view showing a state in which the pipe for improving material supply is extended by the driving means, and FIG. It is explanatory drawing which shows the state which the piping shrunk.

  As shown in FIGS. 1 and 2, the ground improvement device 10 has a construction machine 11, and a leader 12 is erected on the front surface of the construction machine 11. A rack 13 provided on the front side of the reader 12 is engaged with a pinion (not shown) of the lifting device 14, and an attachment 15 connected to the lifting device 14 moves up and down along the reader 12. . Then, a fixed-side stirring mixer 20 that is inserted into the ground A and supplied with an improvement material C such as cement slurry or air and stirred and mixed with the in-situ soil B and the movable-side stirring portion 20 is inserted into the tip 15a of the attachment 15. And a stirring mixer 30.

  As shown in FIGS. 3B and 4, a pair of stirring mixers 20 on the fixed side extending in the vertical direction are integrally extended from the U-shaped tip 15 a to the U-shaped tip 15 a of the attachment 15. Are attached via frames 21 and 21. Further, as shown in FIGS. 1 to 3, the movable body moves in a direction away from the state where it is close (close) to the fixed-side stirring mixer 20 via a pair of hydraulic cylinders (drive means) 40, 40. A side stirring mixer 30 is also provided. The movable-side stirring mixer 30 is provided in an adjacent state so as not to overlap the fixed-side stirring mixer 20 in an initial state before being moved.

  As shown in FIGS. 1 to 5, the stirring mixer 20 on the fixed side includes a pair of frames 21 and 21 that extend integrally from the U-shaped tip portion 15 a of the attachment 15 in the vertical direction, and the pair of frames 21 and 21. 21 is rotatably supported at the upper end side, and is attached to the drive shaft 22 having the drive sprockets 23 mounted on both sides thereof, and is rotatably supported at predetermined intervals from the upper side to the lower end side of the pair of frames 21 and 21, and driven on both sides. A motor (driving means) that is attached to the inner surface of one of the frames 21 of the attachment 15 with four driven shafts 24 each having a sprocket 25 attached thereto and a cover 26c and the like, and that drives the drive shaft 22 through the gears 26a and 26b. ) 26, a pair of driven sprockets 23, 23 on the drive shaft 22 and a pair of driven sprockets 25, 2 on both sides of the four driven shafts 24 A pair of endless chains (endless strips) 27, 27 spanned between the two and a plurality of excavations as excavation claws attached to the pair of endless chains 27, 27 at predetermined intervals. It comprises a bit (bit) 28 and a plurality of stirring blades 29 that are attached to the drive shaft 22 and each end of the driven shaft 24 and to both sides of the center 24 at predetermined intervals.

  As shown in FIG. 4 and FIG. 5A, the drive gear 26 a fixed to the rotation shaft of the motor 26 meshes with the gear 26 b fixed to the drive shaft 22, so that one motor 26 forms a pair of endless shapes. The four driven shafts 24 are rotated through the chains 27 and 27, respectively. As shown in FIG. 4, the motor 26 and the gears 26a and 26b are respectively covered with a cover 26c.

  Moreover, as shown in FIGS. 1-5, each stirring blade 29 attached to the four places of the drive shaft 22 and each driven shaft 24 extends in a cross shape at intervals of 90 degrees on one side or both sides. The phase is shifted by 45 degrees.

  As shown in FIG. 1 to FIG. 3 and FIG. 5, the stirring mixer 30 on the movable side has both sides extending in the vertical direction with the same spacing as the spacing between the U-shaped tip portions 15 a of the attachment 15. A U-shaped frame 31 having 31b, 31b and a ceiling portion 31a, and a drive shaft 32 rotatably supported on the upper end sides of both side portions 31b, 31b of the frame 31 and mounted with drive sprockets 33 on both sides; The four driven shafts 34 that are rotatably supported at predetermined intervals from the upper side to the lower side of the both side portions 31b and 31b of the frame 31 and are respectively attached to the driven sprockets 35 on both sides, and one side portion 31b of the frame 31 A motor (driving means) 36 that is attached to the inner surface of the motor with a cover 36c or the like and rotationally drives the drive shaft 32 via the gears 36a and 36b, and a pair of drive shaft A pair of endless chains (endless strips) 37, 37 spanned between each pair of driven sprockets 35, 35 on both sides of the sprockets 33, 33 and the four driven shafts 34, A plurality of excavation bits (bits) 38 as excavation claws attached to the endless chains 37, 37 at predetermined intervals, and four positions at predetermined intervals on both ends and the central sides of the drive shaft 32 and each driven shaft 34 And a plurality of attached stirring blades 39.

  As shown in FIG. 3A and FIG. 5A, a pair of one motor 36 is coupled with a drive gear 36 a fixed to the rotation shaft of the motor 36 by meshing with a gear 36 b fixed to the drive shaft 32. The four driven shafts 34 are respectively rotated through the endless chains 37 and 37. As shown in FIG. 3A, the motor 36 and the gears 36a and 36b are respectively covered with a cover 36c.

  In addition, as shown in FIGS. 1 to 3 and 5, the stirring blades 39 attached to the four positions of the drive shaft 32 and the driven shafts 34 extend in a cross shape at intervals of 90 degrees on one side or both sides. In the upper and lower rows, the phase is shifted by 45 degrees.

  Further, as shown in FIGS. 3A and 3B, the pair of frames 21 and 21 of the fixed-side stirring mixer 20 and the side portions 31b and 31b of the frame 31 of the movable-side stirring mixer 30 are the same. The length and the same width are formed respectively. As shown in FIGS. 3 to 5, the pair of frames 21, 21 of the fixed-side stirring mixer 20 and the side portions 31 b, 31 b of the frame 31 of the movable-side stirring mixer 30 are viewed from the side. Are connected to each other by a pair of hydraulic cylinders 40, 40 arranged so as to cross each other. Each of the hydraulic cylinders 40 includes a cylinder body 40a and a piston rod 40b that moves forward and backward in the cylinder body 40a by hydraulic pressure.

  4 and 5B, the base end portion of the cylinder body 40a of one hydraulic cylinder 40 is connected to the bracket 41 and the pin on the front upper portion of the fixed-side frame 21 located on the right side when viewed from the front. The front end portion of the piston rod 40b of one hydraulic cylinder 40 is mounted on the bracket 43 and the pin 44 at the lower back of the side portion 31b of the movable side frame 31 that is pivotally supported through 42 and located on the right side when viewed from the front. It is pivoted through.

  Further, as shown in FIGS. 4 and 5 (a) and 5 (b), the base end portion of the cylinder body 40a of the other hydraulic cylinder 40 is located at the lower front portion of the fixed frame 21 located on the left side when viewed from the front. The front end of the piston rod 40b of one hydraulic cylinder 40 is bracketed to the upper part of the back surface of the side portion 31b of the movable frame 31 located on the left side when viewed from the front, while being pivotally supported via the bracket 43 and the pin 44. 41 and pin 42 are pivotally supported.

  As shown in FIGS. 5A to 5D, the pair of hydraulic cylinders 40 and 40 includes a small-diameter cylindrical portion 50b that expands and contracts in conjunction with expansion and contraction of each piston rod 40b, and the small-diameter cylindrical portion 50b. Each of the expansion pipes 50 for supplying the improved material, which includes the large-diameter cylindrical portion 50a included, is provided. A base end portion of the large-diameter cylindrical portion 50a of each expansion / contraction pipe 50 is connected to a supply pipe 52 arranged along the attachment 15 and the reader 12 from the frame 21 via a flexible pipe 51, and The distal end portion of the small diameter cylindrical portion 50 b of each telescopic pipe 50 is connected to a nozzle pipe 54 having a discharge port 54 a through a flexible pipe 53. Cement slurry (improving material) C mixed with compressed air is sprayed from the discharge port 54a at the tip of the nozzle pipe 54 to the improved area in the original position soil B of the ground A. In the figure, symbol D indicates an existing structure, and symbol E indicates a solidified body (improved body).

  Next, a first (rectangular block solidified) construction example by the ground improvement device 10 having the above-described configuration will be described in order with reference to FIGS.

  First, as shown in FIG. 6, the chain 27 of the fixed stirring mixer 20 fixed to the tip 15a of the attachment 15 of the ground improvement device 10 and the chain 37 of the movable stirring mixer 30 are rotated in the reverse direction. It penetrates into ground A. At this time, since the rotational forces of the chains 27 and 37 are reversed by the reverse rotation, the fixed side stirring and mixing device 20 and the movable side stirring and mixing device 30 are maintained while maintaining the verticality. The machine 20 and the stirring mixer 30 on the movable side can be easily and smoothly penetrated into the ground A through the plurality of excavating bits 28 and 38 and the plurality of stirring blades 29 and 39.

  Next, as shown in FIG. 7, the rotation of the chain 27 of the fixed-side stirring mixer 20 is stopped. As shown in FIGS. 8 and 9, the piston rods 40b of the pair of hydraulic cylinders 40, 40 are moved while the chain 27 is stopped so that the fixed-side stirring mixer 20 functions as a reaction force plate to obtain a reaction force. The movable stirring mixer 30 is translated forward by synchronizing and extending to the same length. The cement slurry C mixed with the compressed air from the discharge port 54a of the nozzle pipe 54 disposed in the movable-side stirring mixer 30 during the penetration into the ground A and the forward parallel movement is used as the in-situ soil of the ground A. By injecting into the improved zone in B, the ground is improved by stirring and mixing through a plurality of stirring blades 29 and 39 while injecting cement slurry C into the original soil B.

  Then, as shown in FIG. 10, a rectangular block (wall) shape is formed in the supporting ground A directly under the existing structure D by the ground improvement by the parallel movement of the movable side stirring mixer 30 from the vertical direction to the front. The solidified body (improved body) E can be created from the vertical to the horizontal, and the ground improvement of the supporting ground A directly under the existing structure D can be performed easily and reliably.

  In this way, the stirring mixer 20 is fixed to the tip 15a of the attachment 15 of the ground improvement device 10, and separated from the fixed stirring mixer 20 via the pair of hydraulic cylinders 40, 40. The width of ground improvement can be freely changed in the depth direction by providing one movable-side stirrer / mixer 30 that moves in a moving direction and moving the movable-side stirrer / mixer 30 forward by each hydraulic cylinder 40. Can do. Thereby, a surplus improvement part can be minimized and cost reduction can be attained by that much.

  Further, the stirring mixers 20 and 30 are driven by drive shafts 22 and 32 rotated by motors 26 and 36, drive sprockets 23 and 33 of the drive shafts 22 and 32, and driven sprockets of the four driven shafts 24 and 34, respectively. Endless chains 27 and 37 spanned between 25 and 35 and the driven shafts 24 and 34 and drive shafts 22 and 32 rotated by the endless chains 27 and 37 at predetermined intervals (this first embodiment) In this case, the construction range in the horizontal direction can be widened and the range that can be improved at a time can be increased.

  Further, when the ground is improved, the chain 37 of the movable stirring mixer 30 is rotated, the rotation of the chain 27 of the fixed stirring mixer 20 is stopped, and the fixed stirring mixer 20 is moved to the reaction plate. Therefore, the improvement range can be expanded only in front of the movable stirring mixer 30 on the movable side. Thereby, the conventional reaction force plate becomes unnecessary.

  Furthermore, by using the hydraulic cylinder 40 as a driving means for moving the movable-side stirring mixer 30 forward, the width of ground improvement can be freely changed with a simple structure.

  Next, the 2nd (fan block-shaped solidified body) construction example by the ground improvement apparatus 10 of the said structure is demonstrated in order using FIGS. 11-15.

  First, as shown in FIG. 11, the chain 27 of the fixed stirring mixer 20 fixed to the tip 15 a of the attachment 15 of the ground improvement device 10 and the chain 37 of the movable stirring mixer 30 are rotated in reverse to each other. It penetrates into ground A. At this time, since the rotational forces of the chains 27 and 37 are reversed by the reverse rotation, the fixed side stirring and mixing device 20 and the movable side stirring and mixing device 30 are maintained while maintaining the verticality. The machine 20 and the stirring mixer 30 on the movable side can be easily and smoothly penetrated into the ground A through the plurality of excavating bits 28 and 38 and the plurality of stirring blades 29 and 39.

  Next, as shown in FIG. 12, the rotation of the chain 27 of the fixed-side stirring mixer 20 is stopped, and the piston rods 40 b of the pair of hydraulic cylinders 40, 40 are slightly extended in synchronism with each other. The agitating mixer 30 is moved slightly in parallel forward. As shown in FIGS. 13 and 14, the piston of one hydraulic cylinder 40 disposed on the right side of the front face is obtained while the chain 27 is stopped so that the stationary stirring mixer 20 functions as a reaction force plate to obtain a reaction force. By extending the rod 40b longer than the piston rod 40b of the other hydraulic cylinder 40, the movable-side stirring mixer 30 is swung upward by 90 degrees. During the penetration into the ground A and the upward swing, the cement slurry C mixed with compressed air from the discharge port 54a of the nozzle pipe 54 arranged in the movable stirring mixer 30 is placed in the soil in the ground A. By injecting into the improved zone in B, the ground is improved by stirring and mixing through a plurality of stirring blades 29 and 39 while injecting cement slurry C into the original soil B.

  Then, as shown in FIG. 15, the fan block-shaped solidified body E is formed in the supporting ground A directly under the existing structure D by improving the ground by swinging the stirring mixer 30 on the movable side upward from the vertical direction. Can be constructed from the vertical to the horizontal, and the ground improvement of the supporting ground A directly under the existing structure D can be easily and reliably performed. Thereby, there exists an effect | action and effect similar to the said 1st construction example.

Second Embodiment
FIG. 16 is a side view showing a state where each of the movable and fixed agitating mixers of the ground improvement device according to the second embodiment of the present invention has penetrated the ground, and FIG. 17 is a stirring on one movable side of the ground improvement device. FIG. 18 is a side view showing a state in which the mixer has been translated forward, FIG. 18 is a side view showing a state in which the other movable stirring mixer of the ground improvement device has been translated further forward, and FIG. It is explanatory drawing which shows the state of the ground improvement by the parallel movement ahead of each stirring mixer of each movable side.

  The ground improvement device 10 ′ of the second embodiment has a movable side moving through a pair of hydraulic cylinders (driving means) 40, 40 in a direction away from a state of approaching the movable side stirring mixer 30. Another stirring mixer 30 is provided. Each hydraulic cylinder 40 includes brackets 41 and 43 and pins 42 and 44 between both side portions 31b and 31b of each frame 31 of the pair of movable-side stirring mixers 30 and 30, as in the first embodiment. Since the other components are the same as those of the first embodiment, the same reference numerals are given to the same components, and the detailed description is omitted.

  Next, construction examples by the ground improvement device 10 ′ having the above-described configuration will be described in order with reference to FIGS. 16 to 19.

  First, as shown in FIG. 16, the chain 27 of the fixed-side stirring mixer 20 fixed to the tip 15 a of the attachment 15 of the ground improvement device 10 ′, and each of the pair of movable-side stirring mixers 30, 30. 37 penetrates the ground A while rotating in reverse. At this time, the reverse rotation of the chains 27 and 37 cancels each other's rotational force, so that the fixed side stirring mixer 20 and the movable side stirring mixer 30 are kept vertical while maintaining the verticality. The stirring mixer 20 and the stirring mixer 30 on each movable side can be easily and smoothly penetrated into the ground A through the plurality of excavating bits 28 and 38 and the plurality of stirring blades 29 and 39.

  Next, as shown in FIG. 17, the rotation of the chain 27 of the fixed-side stirring mixer 20 is stopped. While the chain 27 is stopped, the fixed-side stirring mixer 20 functions as a reaction force plate to obtain a reaction force. First, a pair of one movable-side stirring mixer 30 approaching the fixed-side stirring mixer 20 is used. The piston rods 40b of the hydraulic cylinders 40, 40 are synchronized and extended to the same length, whereby the one stirring mixer 30 on the movable side is moved in parallel forward.

  Next, as shown in FIG. 18, the piston rods 40b of the pair of hydraulic cylinders 40, 40 of the other movable-side stirring mixer 30 approaching one movable-side stirring mixer 30 are synchronized to have the same length. By extending the length, the other movable-side stirring mixer 30 is further translated forward.

  The cement slurry C mixed with the compressed air from the discharge port 54a of the nozzle pipe 54 disposed in the stirring mixer 30 on each movable side during the penetration into the ground A and the parallel movement forward is the original position of the ground A. By injecting into the improved area in the soil B, the ground is improved by stirring and mixing through the plurality of stirring blades 29 and 39 while injecting the cement slurry C into the original soil B.

  Then, as shown in FIG. 19, a rectangular block shape is formed in the supporting ground A directly under the existing structure D by the ground improvement by the parallel movement of the pair of movable-side stirring mixers 30, 30 forward from the vertical direction. The solidified body E can be created from the vertical to the horizontal, and the ground improvement of the supporting ground A directly under the existing structure D can be easily and reliably performed.

  In this manner, the other movable side stirring mixer, which is the other moving further in the direction of separation through the pair of hydraulic cylinders 40, 40 from the state of being close to one movable side stirring mixer 30. 30, the original position soil B of the ground A can be improved, and the width of the solidified body E can be further increased. Thereby, there exists an effect | action and effect similar to the 1st construction example of the said 1st Embodiment.

<Third Embodiment>
FIG. 20 is a side view showing a state in which each of the movable and fixed stirring mixers of the ground improvement device according to the third embodiment of the present invention penetrates into the ground.

  The ground improvement device 10 ″ according to the third embodiment includes a pair of hydraulic cylinders (in a direction away from a state in which the fixed agitating mixer 20 is sandwiched between the distal end portion 15a of the attachment 15 of the construction machine 11 so as to be separated from each other. (Drive means) 40 and 40 are provided with a pair of movable-side agitating and mixing machines 30. The other components are the same as those in the first embodiment, and the same components are denoted by the same reference numerals. Detailed description will be omitted.

  Next, a first (rectangular block solidified) construction example using the ground improvement device 10 ″ having the above-described configuration will be described with reference to FIGS. 20 to 22.

  First, as shown in FIG. 20, the chain 27 of the fixed stirring mixer 20 fixed to the tip 15 a of the attachment 15 of the ground improvement device 10 ″ and each chain 37 of the pair of movable stirring mixers 30, 30. And reversely rotate with each other to penetrate the ground A. At this time, the reverse rotation of the chains 27 and 37 cancels each other's rotational force. While maintaining the verticality with respect to the mixer 30, the fixed-side stirring mixer 20 and the movable-side stirring mixer 30 can be easily connected to the ground A via a plurality of excavating bits 28 and 38 and a plurality of stirring blades 29 and 39. And it can penetrate smoothly.

  Next, as shown in FIG. 21, the rotation of the chain 27 of the fixed-side stirring mixer 20 is stopped. By stopping the chain 27, the fixed-side stirring mixer 20 functions as a reaction force plate to obtain a reaction force, and each piston of each pair of hydraulic cylinders 40, 40 of the pair of movable-side stirring mixers 30, 30 is used. The rods 40b are synchronized and extended to the same length, whereby the pair of movable-side stirring mixers 30 and 30 are translated in the front-rear direction. During the penetration into the ground A and the parallel movement in the front-rear direction, the cement slurry C mixed with compressed air from the discharge ports 54a of the nozzle pipes 54 disposed in the pair of stirring mixers 30 and 30 on the movable side is ground. By injecting into the improved zone in the original soil B of A, the ground is improved by stirring and mixing through the plurality of stirring blades 29 and 39 while injecting the cement slurry C into the original soil B.

  Then, as shown in FIG. 22, a rectangular block is formed in the supporting ground A directly under the existing structure D by improving the ground by parallel movement of the pair of movable-side stirring mixers 30, 30 from the vertical direction to the front-rear direction. In-situ soil B of the ground A located on both sides of the agitating mixer 20 on the fixed side, including the supporting ground A directly below the existing structure D The ground improvement can be easily and reliably performed. Thereby, there exists an effect | action and effect similar to the 1st construction example of the said 1st Embodiment.

  Next, a second construction example (fan block-shaped solidified body) by the ground improvement device 10 ″ having the above configuration will be described with reference to FIGS. 23 and 24.

  First, the chain 27 of the fixed-side stirring mixer 20 fixed to the tip 15a of the attachment 15 of the ground improvement device 10 ″ and the chains 37 of the pair of movable-side stirring mixers 30 and 30 are rotated in the reverse direction. After penetrating the ground A through the plurality of excavating bits 28 and 38 and the plurality of stirring blades 29 and 39 while maintaining verticality, as shown in FIG. 23, the rotation of the chain 27 of the stirring mixer 20 on the fixed side is performed. By stopping the chain 27, the fixed-side stirring mixer 20 functions as a reaction force plate to obtain a reaction force, and the piston rod 40b of each hydraulic cylinder 40 is connected to the piston of each other hydraulic cylinder 40. By extending longer than the rod 40b, the pair of movable-side stirring mixers 30 and 30 are swung upward by 90 degrees respectively. When moving, the cement slurry C mixed with compressed air is injected into the improved area in the soil B of the ground A from the discharge port 54a of the nozzle pipe 54 disposed in the pair of stirring mixers 30 and 30 on the movable side. As a result, the ground is improved by stirring and mixing through the plurality of stirring blades 29 and 39 while injecting the cement slurry C into the original soil B.

  Then, as shown in FIG. 24, a fan block shape is formed in the supporting ground A directly under the existing structure D by improving the ground by swinging the pair of movable-side stirring mixers 30 and 30 upward from the vertical direction. The solidified body E of the ground A including the supporting ground A directly under the existing structure D, including the supporting ground A immediately below the existing structure D, of the soil B of the ground A located on both sides of the stirring mixer 20 on the fixed side can be formed. Ground improvement can be performed easily and reliably. Thereby, there exists an effect | action and effect similar to the 2nd construction example of the said 1st Embodiment.

  According to each of the above embodiments, the hydraulic cylinder is used as the driving means for moving the movable-side stirring mixer. However, the movable-side stirring mixer is driven by another driving means using a pantograph mechanism, a lifter mechanism, or the like. May be moved. Further, the number of movable side mixers may be three or more, and the number of driven shafts is not limited to four, but may be one to three or four or more. Moreover, although cement slurry was used as the improving material, a solidifying material other than cement may be used as the improving material. Furthermore, although an endless chain is used as the endless band, the endless band is not limited to the endless chain.

DESCRIPTION OF SYMBOLS 10,10 ', 10 "Ground improvement apparatus 11 Construction machine 15 Attachment 15a Tip part 20 Stirring mixer on fixed side 22 Drive shaft 23 Drive sprocket 24 Drive shaft 25 Drive sprocket 26 Motor 27 Endless chain 28 Drilling bit (bit)
29 Stirring blade 30 Stirring mixer on movable side 32 Drive shaft 33 Drive sprocket 34 Drive shaft 35 Drive sprocket 36 Motor 37 Endless chain 38 Drilling bit (bit)
39 Stirring blade 40 Hydraulic cylinder (drive means)
A Ground B In-situ soil C Improvement material

Claims (7)

In the ground improvement device equipped with an agitating mixer that stirs and mixes with the in-situ soil while supplying the improvement material that penetrates into the ground at the tip of the attachment of the construction machine
A stirrer / mixer is fixed to the tip of the attachment, and at least one movable-side stirrer / mixer that moves in a direction away from the fixed-side stirrer / mixer through a driving unit is provided .
Each of the agitating mixers includes a drive shaft including a drive sprocket driven by a motor, at least one driven shaft including a driven sprocket driven by the drive sprocket of the drive shaft, and the drive sprocket and the driven sprocket. An endless chain stretched between them, a plurality of bits attached to the endless chain at predetermined intervals, and a plurality of stirring blades attached to the drive shaft and the driven shaft at predetermined intervals in soil improvement apparatus characterized by being configured. The ground improvement device according to claim 1,
A ground improvement device, further comprising one movable-side stirrer / mixer that moves via a driving means in a direction away from a state of approaching the movable-side stirrer / mixer. The ground improvement device according to claim 1,
A ground improvement device comprising a pair of movable-side stirring mixers that move via a driving means in a direction away from an approaching state so as to sandwich the fixed-side stirring mixer. The ground improvement device according to any one of claims 1 to 3,
A ground improvement device, wherein the driving means is a hydraulic cylinder. The distal end portion of the attachment of the construction machine, Te ground improvement method odor using soil improvement apparatus equipped with a stirring and mixing machine which is stirred to mix the original position soil while supplying an improved material penetrating into the ground,
While operating both the fixed-side stirring mixer fixed to the tip of the attachment and the movable-side stirring mixer provided close to the fixed-side stirring mixer, A direction in which the movable-side stirring mixer is separated from the fixed-side stirring mixer while penetrating to a predetermined depth and then obtaining a reaction force by stopping the operation of the fixed-side stirring mixer. The ground improvement method is characterized in that the ground is improved by stirring and mixing while injecting the improvement material into the original soil of the ground. The ground improvement method according to claim 5,
The in-situ soil in the ground is further removed by another movable stirring mixer that moves further in a direction away from the movable stirring mixer in the direction away from the driving means. Ground improvement method characterized by improvement. The ground improvement method according to claim 5,
The pair of movable side agitating mixers moving in a direction away from each other through the driving means from the approaching state with the fixed side agitating mixer sandwiched therebetween, the ground located on both sides of the fixed agitating mixer A ground improvement method characterized by improving the ground of each original soil.

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