JP2010001694A - Soil improving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil improving apparatus allowing a worker to cut a pile to have an optional cross sectional shape such as circular or rectangular shape or the like and stir the soil and capable of preventing it from falling down to achieve excellent stability and construction for even a low and narrow restricted space. <P>SOLUTION: This soil improving apparatus is constituted by connecting a plurality of short rods 11 mutually, arranging three stirring rods 10 provided with a stirring blade 12 each at an eccentric position at an equal interval therebetween, and installing a driving device 20 for rotating and revolving each of the stirring rods 10 to prevent the stirring blades 12 from interfering with each other on the ground surface. Consequently, the improved pile having the optional cross sectional shape such as circular or rectangular shape or the like can be constructed, the continuous improved piles can be easily constructed by merely overlapping them slightly when constructing the improved piles being long in the horizontal direction, and outbreak to large extent is unnecessary. Since the driving device 20 is installed on the ground surface, this apparatus has its center of gravity at a low level, does not fall down simply, and has excellent stability to decide a stirring position with high precision. Furthermore, since the short rods 11 are mutually joined one after another by adding them for stirring, it is possible to dispense with a construction machine having considerable height and construct in even a place having a height limit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ground improvement device for injecting a solidification material into the ground, stirring and mixing with excavated soil, and solidifying the solidification material to improve the ground.

  Conventionally, a soil cement column method has been widely known in which a solidified material such as cement milk is injected into soft ground, and the solidified material and excavated soil are mixed by agitation and solidified, and an improved pile is formed in the ground to strengthen the ground. ing. The ground improvement device used in this construction method is equipped with a stirring blade attached to a rod that can discharge solidified material, and is pushed from the ground plant while rotating the stirring rod with a drive device supported by the arm of the construction machine. There is a structure in which the ground can be stirred with a stirring blade while discharging the solidified material (see, for example, Patent Document 1).

By the way, when creating a long improved pile which continues in the transverse direction, a plurality of places are stirred, but in the technique of Patent Document 1, since the cross section of the improved pile is limited to a circle, it is large so that each improved place is continuous. It was necessary to overlap, and the excess dug increased and the efficiency was poor. In addition, since the conventional ground improvement device has a structure in which the drive portion is located above, the center of gravity is high, the stability is poor, and there is a risk of falling during work. Furthermore, since the construction machine has a height corresponding to the agitation depth, construction was not possible in places with height restrictions such as under bridges, under guards, and under tower towers.
JP 2008-25247 A

  SUMMARY OF THE INVENTION A first problem to be solved by the present invention is to provide a ground improvement device which can be cut and stirred into an arbitrary cross-sectional shape such as a circle or a rectangle. A second problem is to provide a ground improvement device that has no risk of falling, has excellent stability, and enables construction with a low head.

The configuration of the present invention that solves this problem is as follows.
1) A ground improvement device that injects solidified material into the ground, mixes with the excavated soil, and solidifies the solidified material to improve the ground, including a plurality of stirring rods with rods attached at eccentric positions of the stirring blades, etc. Installed at intervals, provided with a drive device that rotates and revolves each stirring rod so that the stirring blades do not interfere with each other, provided with a solidifying material injection means for injecting solidifying material into the ground, supported by the upper part of each stirring rod A ground improvement device 2) characterized in that a ground improvement device 2) is provided. A ground improvement device 3) according to the above 1), in which a gantry is installed on the ground surface, and a driving device is movably disposed on the gantry. The stirring rod has a structure in which a plurality of short rods are detachably connected, and the lifting / lowering means is provided with a lifting / lowering jack that lifts and lowers the driving device, and the chucking device that loosens the middle position of the stirring rod is driven by the driving device. Provided on the rack The ground improvement device according to 2) above, wherein the mast is erected on the mast and the swivel supporting the upper end of the agitation rod is provided so as to be movable up and down along the mast. 4) The agitation rod has a plurality of short rods The lifting / lowering means is provided with a lifting / lowering base via a lifting / lowering jack on the drive device, and an upper chucking device for loosening the middle position of the stirring rod is provided on the lifting / lowering base. 2) description above, wherein the lower chucking device for loosening the position is provided in the drive device, the mast is erected on the mount, and the swivel that supports the upper end of the stirring rod is provided so as to be movable up and down along the mast. 5) The ground improvement device according to any one of 1) to 4), wherein a support for holding the rods at a predetermined interval is provided.

  According to the configuration of the first aspect of the present invention, since the plurality of stirring rods having the rods attached to the eccentric positions of the stirring blades are rotated and revolved, they can be cut and stirred into an arbitrary cross-sectional shape such as a circular shape or a rectangular shape. In the case of constructing a long improved pile, it is possible to easily construct a continuous improved pile only by slightly overlapping, and it is efficient because there is no need to dig a large amount like the prior art.

  Further, according to the second aspect of the present invention, since the driving device is installed on the ground surface, there is no danger of falling over at a low center of gravity, and the stability is excellent, and the agitation position can be easily and accurately positioned. Furthermore, according to the third and fourth aspects of the present invention, since a short rod is added and lowered by a lifting jack and stirred, a construction machine having a conventional height can be omitted, and a bridge / guard Construction is possible even in places with height restrictions (5 to 6m) such as under the tower towers.

  The gantry of the present invention is formed in a straight line shape or a lattice shape according to the shape of the improved pile to be constructed, and the lattice shape can easily move the driving device back and forth and right and left by movement like an XY plotter. it can. Moreover, since the stirring rod is multiaxial, it can be mixed in the ground by separately discharging different types of solidifying materials (or adsorbents), and the step of mixing in advance can be omitted. In addition, if a support for holding the rods at a predetermined interval is provided, twisting of the stirring rod against the ground resistance can be prevented during stirring. Embodiments of the present invention will be specifically described below with reference to the drawings.

  The first embodiment shown in FIGS. 1 to 6 is an example in which the stirring rod can be moved up and down by moving the drive device up and down with a hydraulic jack. FIG. 1 is an explanatory diagram of a ground improvement device according to a first embodiment, FIG. 2 is a longitudinal sectional view of a driving device according to the first embodiment, FIG. 3 is a transverse sectional view of the driving device according to the first embodiment, and FIG. FIG. 5 is an explanatory view of the support of the first embodiment, and FIG. 6 is an explanatory view showing a rotation locus of the stirring blade of the first embodiment.

  In the figure, 10 is a stirring rod, 11 is a rod, 11a is a discharge port, 11b is a support shaft, 11c is a joint, 12 is a stirring blade, 13 is a support, 13a is a thrust ring, 13b is a connecting member, and 20 is a driving device. , 21 is an internal gear, 21a is a gear, 22 is a sun gear, 23 is a planetary gear, 23a is a through hole, 24 is a motor, 24a is a pinion gear, 25 is an outer shell, 25a is a rotating body, 26 is a chucking device, Reference numeral 30 denotes a stand, 31 a mast, 32 a hydraulic jack (elevating jack), 40 a plant, 41 a supply tube, 50 a swivel, G a ground, and S a soil cement.

  The ground improvement apparatus of Example 1 is shown in FIGS. The stirrer rod 10 is formed by connecting a plurality of short rods 11 made of square material having a square cross section so as to be detachable by a joint 11c, and a stirrer blade 12 is attached to the tip of the lowermost rod 11 at an eccentric position. Three are arranged. A flow path (not shown) for supplying a solidifying material is formed inside the rod 11, and a discharge port 11 a for discharging the solidifying material is opened at the tip of the lowermost rod 11. The support 13 includes a thrust ring 13a that supports a midway position of the rod 11, and a connecting member 13b that connects the thrust rings 13a in a triangular shape. In the middle of the rod 11, support shaft portions 11b having a circular cross section are formed at intervals of 2 m so that the thrust ring 13a can be rotatably supported.

  The driving device 20 meshes three planetary gears 23 through which the sun gear 22 and the rod 11 penetrate with the internal teeth of the internal gear 21 having a gear 21 a formed on the outer periphery, and two external gears outside the internal gear 21. The motor 24 is disposed so as to face the pinion gear 24 a of the motor 24 and the gear 21 a of the internal gear 21. The planetary gear 23 is formed with a through hole 23a having a quadrangular cross section for the rod 11 to penetrate therethrough. These are accommodated in an outer shell 25 whose upper and lower surfaces are open, and rotating bodies 25a that can rotate through the rod 11 so as to rotate are arranged above and below the outer shell 25. A chucking device 26 that loosens the midway position of the rod 11 is attached to the upper surface of the drive device 20.

  The gantry 30 is linear, and a pair of left and right is provided to support the left and right lower portions of the drive device 20 so as to be movable. A mast 31 having a height of about 4 to 5 m provided with a stopper (not shown) is erected on the gantry 30 so as to be movable along the longitudinal direction of the gantry 30, and the swivel 50 can be moved up and down with the left and right masts 31. The stopper is supported so that it can be held in place. The gantry 30 includes hydraulic jacks 32 on the left and right sides so that the drive device 20 can be raised and lowered. The hydraulic jack 32 has an expansion / contraction amount substantially equal to the length of one rod 11. The upper end portion of each stirring rod 10 is supported by a swivel 50 and is connected to a supply tube 41 of the plant 40 so that a solidified material can be supplied.

  As shown in FIG. 1, a pair of mounts 30 are installed on the ground surface of the ground G to be improved, and the drive device 20 is arranged and moved on the mounts 30 to extend the hydraulic jacks 32. The plant 40 is placed next to the gantry 30 at the stirring position. The three stirring rods 10 are engaged with the through holes 23a of the planetary gears 23 of the driving device 20 from below, and the chucking device 26 is fastened and held, and the upper end of the penetrating stirring rod 10 is swiveled 50. To support.

  When the plant 40 and the motor 24 are operated, the solidified material is discharged from the discharge port 11a of the rod 11 to the ground G, and the three stirring rods 10 rotate and revolve so that the stirring blades 12 do not interfere with each other (see FIG. 6). ) When the hydraulic jack 32 is retracted, the ground rod G is cut into a substantially rectangular cross section while the stirring rod 10 moves down together with the driving device 20. The excavated soil and the solidified material are agitated and mixed by the agitating blade 12 to become a soil cement S. The support 13 is additionally attached at a position below the driving device 20 according to the progress of stirring, and prevents the rod 11 from being twisted with respect to the resistance of the ground G.

  When the hydraulic jack 32 is completely retracted (the driving device 20 is lowered to the lowest position), the plant 40 and the motor 24 are stopped, the chucking device 26 is loosened, and the hydraulic jack 32 is extended to raise the driving device 20 to the uppermost position. The swivel 50 is removed from the upper end portion of the stirring rod 10 and raised, and the rod 11 is added to the upper end portion of the stirring rod 10 and supported by the swivel 50. Then, the chucking device 26 is tightened, the plant 40 and the motor 24 are operated, the hydraulic jack 32 is retracted, and the ground G is cut. This process is repeated until the design depth is reached.

  When stirring to the design depth, the plant 40 and the motor 24 are stopped, the hydraulic jack 32 is extended, the stirring rod 10 is pulled up, the chucking device 26 is loosened, the stirring rod 10 is separated, and the drive device 20 is moved to the next stirring position. It is moved and fixed, and the plant 40 is also moved. Then, the ground G is stirred to a predetermined depth while discharging the solidified material in the same manner as described above, and these steps are repeated to create an improved pile that is long in the lateral direction.

  Example 2 shown in FIG. 7 is an example in which the agitation rod can be moved up and down by moving up and down a lifting platform provided on the driving device with a hydraulic jack. FIG. 7 is a longitudinal sectional view of the driving apparatus of the second embodiment. In the figure, 27 is a lifting platform, 28 is an upper chucking device, and 29 is a lower chucking device. In the second embodiment, as shown in FIG. 7, a lifting platform 27 is mounted on the driving device 20 via a hydraulic jack 32, an upper chucking device 28 is mounted on the lifting platform 27, and a lower chucking device 29 is mounted on the driving device 20. It is attached. The driving device 20 is fixed to the gantry 30.

  In the second embodiment, with the hydraulic jack 32 extended, the upper chucking device 28 and the lower chucking device 29 are loosened to attach the stirring rod 10, and the upper chucking device 28 is tightened to operate the plant 40 and the motor 24. . When the hydraulic jack 32 is retracted, the stirring rod 10 moves down together with the lifting platform 27 and cuts the ground G.

  When the elevator 27 is lowered to the lowest position, the plant 40 and the motor 24 are stopped, the lower chucking device 29 is tightened and the upper chucking device 28 is loosened, and the hydraulic jack 32 is extended to raise the elevator 27 to the uppermost position. The swivel 50 is removed from the stirring rod 10 and the rod 11 is added. Then, the upper chucking device 28 is tightened and the lower chucking device 29 is loosened, the plant 40 and the motor 24 are operated, and the above steps are repeated. In other respects, the reference numeral, configuration, and operational effects are the same as those in the first embodiment.

  The ground improvement device of the present invention is used not only for strengthening soft ground but also for treating contaminated soil (for example, containment by adsorption solidification).

It is explanatory drawing of the ground improvement apparatus of Example 1. FIG. FIG. 3 is a longitudinal sectional view of the drive device according to the first embodiment. FIG. 3 is a cross-sectional view of the drive device according to the first embodiment. FIG. 3 is a plan view of the drive device according to the first embodiment. It is explanatory drawing of the support of Example 1. FIG. 6 is an explanatory diagram showing a rotation trajectory of a stirring blade in Example 1. FIG. FIG. 6 is a longitudinal sectional view of a drive device according to a second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stirring rod 11 Rod 11a Discharge port 11b Support shaft part 11c Joint 12 Stirring blade 13 Support 13a Thrust ring 13b Connecting member 20 Drive device 21 Internal gear 21a Gear 22 Sun gear 23 Planetary gear 23a Through hole 24 Motor 24a Pinion gear 25 Outer shell 25a Rotating body 26 Chucking device 27 Lifting table 28 Upper chucking device 29 Lower chucking device 30 Base 31 Mast 32 Hydraulic jack (elevating jack)
40 Plant 41 Supply tube 50 Swivel G Ground S Soil cement

Claims (5)

  A ground improvement device that injects solidified material into the ground and mixes it with the excavated soil, solidifies the solidified material and improves the ground, and a plurality of stirring rods with rods attached to the eccentric positions of the stirring blades are equidistantly spaced. Provided with a drive device that rotates and revolves each stirring rod so that the stirring blades do not interfere with each other, a solidifying material injection means for injecting the solidifying material into the ground, and a lift that moves up and down by supporting the upper part of each stirring rod A ground improvement device characterized by comprising means.   The ground improvement apparatus of Claim 1 which installed the mount frame on the ground surface and arrange | positioned the drive device on the mount frame so that a movement to a horizontal direction is possible.   The stirring rod has a structure in which a plurality of short rods are detachably connected, and the lifting / lowering means is provided with a lifting / lowering jack that lifts and lowers the driving device, and the chucking device that loosens the middle position of the stirring rod is driven by the driving device. The ground improvement device according to claim 2, wherein the ground improvement device is configured so that a mast is erected on the gantry and a swivel supporting the upper end portion of the stirring rod is provided so as to be movable up and down along the mast.   An upper chucking device in which a stirring rod has a structure in which a plurality of short rods are detachably connected, and the lifting means is provided with a lifting platform via a lifting jack on the drive device, and loosens the middle position of the stirring rod Is installed on the lifting platform, a lower chucking device that loosens the middle position of the stirring rod is installed in the drive unit, a mast is erected on the mount, and the swivel that supports the upper end of the stirring rod can be raised and lowered along the mast The ground improvement device according to claim 2, which has a provided structure.   The ground improvement apparatus in any one of Claims 1-4 which provided the support which hold | maintains rods at predetermined intervals.

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