JP2009057748A - Agitator for shallow ground improvement, shallow ground improver, shallow ground improvement system, construction method for improving shallow ground, and construction method for improving contaminated soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems of conventional methods for improving shallow ground wherein poor agitation is liable to occur depending on soil quality, when a ground is hard, a large-sized machine is required since an agitator with large torque is required, when a ground to be improved is viscous (argilliferous), much soil is adhered to a rotary blade, co-rotation phenomenon of the rotary blade and the soil occurs, and poor agitation occurs, and when an improving substance is powdery, the substance is dispersed before and during the agitation and the environment is impaired. <P>SOLUTION: This agitator for shallow ground improvement comprises an agitation member for agitating a shallow ground for which improvement is required. The agitator is attached to the end of the arm of a hydraulic shovel excavator. A high-pressure jetting device which jets a fluid at high pressure and uses the jetting energy thereof is attached to the agitator. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a shallow ground improvement stirrer, and more particularly to a shallow ground improvement stirrer combined with a high-pressure injection device. It can be used not only for improving shallow ground but also for improving contaminated soil.

  The shallow ground improvement method and the contaminated soil improvement method that have been conventionally performed are mixing and stirring of the improved material by low-pressure discharge (less than about 3 MPa) of powder or slurry.

In Patent Document 1, a base member that can be attached to the tip of an arm of a hydraulic excavator excavator, and support frames are vertically provided on both lower sides of the base member. A rotating shaft having a blade is supported on one end of the rotating shaft, and a driving mechanism for driving the rotating shaft is provided on one end of the rotating shaft. A sand scraping member rotates in the vertical direction on the right end of each support frame. A ground improvement stirrer that is pivotally supported is disclosed.
In Patent Document 2, a rotating shaft is provided so as to connect a lower part of a support portion that is vertically long and is provided in parallel at a predetermined interval and can be moved up and down, and a thin rectangular rotating disk is provided at a predetermined interval on the rotating shaft. A stirrer blade that is supported by five shafts, rises from the square corner of the rotating disk and is curved in the direction of the rotating shaft, a hydraulic motor is provided above the support, and a sprocket is provided on the rotating shaft and the output shaft of the hydraulic motor In addition, a ground improvement stirrer is disclosed in which a chain is placed over a sprocket and a shallow ground can be stirred with less resistance.
JP 2002-081055 A JP 2003-239274 A

  The problem to be solved is that the prior art is excavation / mixing agitation only with the rotor blades of the agitator, and the agitation failure tends to occur due to the soil quality. Further, in the case of hard ground, a stirrer having a large rotational torque is required, which increases the size of the machine. Furthermore, when the improved ground is viscous soil (clay), a large amount of soil adheres to the rotor blades, and the rotation of the rotor blades and the soil decreases, resulting in poor stirring. Furthermore, when the improved body is a powder, the improved material scatters to the surroundings before or during stirring, which is a point that damages the environment.

  In order to solve this problem, the agitator for improving the shallow ground according to the present invention has a stirring member for agitating the shallow ground that needs improvement, and is used by being attached to the tip of the arm of a hydraulic excavator excavator. This is a shallow ground improvement stirrer that is provided with a high-pressure injection device for high-pressure injection of the improvement material toward the soil stirred by the stirring member.

  Furthermore, the said high pressure injection apparatus shall have two or more fixed nozzles, and shall inject the improvement material at high pressure toward the soil of the range stirred with the said stirring member.

  The high-pressure spraying device may have a swinging nozzle and sprays the improving material at a high pressure while swinging toward the soil in the range stirred by the stirring member.

  A stirrer for improving shallow ground according to the present invention has a left side plate and a right side plate on both right and left sides, a bucket having a plurality of excavating blades, a left front end side plate, and a right front end side plate at a tip, and the bucket is attached to the arm. An agitation shaft provided between the arm attachment portion and the center of the left side plate of the bucket to the center of the right side plate, and provided in a direction perpendicular to the extending direction of the arm inside the bucket, and rotatable; A plurality of stirring blades provided on the outside of the stirring shaft; a motor mounting plate removably fixed to the center of either the left side plate or the right side plate of the bucket; and a hydraulic motor attached to the inner side of the motor mounting plate; A power transmission mechanism that transmits the power of the hydraulic motor to the stirring shaft, an injection nozzle that is provided near the arm mounting portion of the bucket and that injects the improved material at a high pressure toward the vicinity of the excavating blade, and the injection nozzle And a modifying material supply pipe provided in the bucket top to supply Ryozai.

  The shallow ground improvement stirrer according to the present invention includes a stirrer having an improvement material supply pipe on the inner side and extending in the vertical direction, an arm mounting portion for attaching the stirrer to the arm, and a lower portion of the stirrer An excavation bit attached to the tip, an agitation rotating shaft that extends above the excavation bit and extends in a direction perpendicular to the agitation device, and a plurality of agitation blades provided on the agitation rotation shaft A hydraulic motor provided in the stirring device, a power transmission mechanism for transmitting the power of the hydraulic motor to the rotating shaft for stirring, and supplied from the improvement material supply pipe toward the soil stirred by the stirring blade And an injection nozzle provided on the stirring device for high-pressure injection of the improved material.

  The shallow ground improvement stirrer can be attached to the tip of the arm of a hydraulic excavator excavator to form a shallow ground improvement machine.

  In addition to the shallow ground improvement machine, a grout pump for supplying an improvement material to the high-pressure injection device, a mixing plant for supplying cement and water mixed to the grout pump, and the mixing plant And the shallow ground improvement system which has the generator which supplies electric power with respect to the said grout pump can be comprised.

  The shallow ground improvement method according to the present invention is a shallow ground improvement method for improving a shallow ground using the shallow ground improvement machine, and a shallow ground that requires improvement is used for the shallow ground. It has a stirring step of stirring, and a high-pressure spraying step of spraying the improved material at a high pressure toward the soil stirred in the stirring step.

  The contaminated soil improvement method according to the present invention is a contaminated soil improvement method for improving contaminated soil using the shallow ground improvement machine, and agitating step of agitating contaminated soil requiring improvement using the agitating member And a high-pressure injection step of high-pressure injection of the improving material toward the soil stirred in the stirring step.

  Since the present invention is configured as described above, the working efficiency is greatly improved by excavating / stirring by the injection energy and stirring by the rotor blades by performing high-pressure injection (5 to 40 Mpa) of the improved material. Can be shortened. Further, by using the injection energy, it is possible to improve not only the shallow layer but also the middle layer. This eliminates the need for equipment that is essentially required for ground improvement in the middle class, leading to a reduction in enforcement costs.

  Since the excavation by high-pressure injection can be performed even on hard ground, the machine can be downsized.

  Even in the case of cohesive soil, high pressure injection near the rotating blades of the stirrer prevents the rotating blades from adhering to the soil and reducing the rotation.

  By using a shallow ground improvement stirrer with a fixed injection nozzle and a shallow ground improvement stirrer with a swinging injection nozzle, depending on the target ground, injection amount, injection pressure, etc. Good improvement work is possible.

  Hereinafter, the best mode for carrying out the present invention will be described. FIG. 1 is a diagram showing a typical system example when the ground improvement method is actually implemented using the present invention. A ground improvement stirrer 108 according to the present invention is attached to the tip of an arm of a hydraulic excavator excavator to form a shallow ground improvement machine 101. Depending on the soil quality of the improved soil (soil that requires ground improvement) 100, whether the shallow ground improvement stirrer is bucket type, rod type, or the injection nozzle is fixed, It is possible to select whether to use a rocking type. In FIG. 1, the bucket type is drawn.

  The ground improvement stirrer 108 is provided with a swivel, and the improvement material (or water) pumped from the grout pump is jetted from the injection nozzle in the ground improvement stirrer 108 through the swivel. Water in the water tank 107 and cement in the cement silo 106 are mixed in the mixing plant 103 and supplied to the grout pump 102 via the flow meter 104. A generator 105 supplies power to the grout pump 102, the mixing plant 103, and the like.

  Specific shapes of the stirrer for improving the shallow ground include a bucket type and a rod type. Four examples can be given by combining a fixed nozzle and a swinging nozzle for each. The difference in the features of Examples 1, 2, 3, and 4 will be briefly described. In Example 1, a stirring blade is provided inside a bucket and four fixed injection nozzles are provided. In Example 2, a stirring blade is provided inside the bucket, and two oscillating nozzles are provided. In Example 3, a drill bit, a rotating shaft orthogonal to the rod, a stirring blade attached to the rotating shaft, and two fixed injection nozzles toward the stirring blade are provided at the tip of the rod. In Example 4, a drill bit, a rotating shaft orthogonal to the rod, a stirring blade attached to the rotating shaft, and one oscillating jet nozzle toward the stirring blade are provided at the tip of the rod.

  FIG. 5 is a view showing an embodiment in which stirring blades are provided inside the bucket and four fixed injection nozzles are provided. FIG. 5a is a side view of the hydraulic excavator excavator as seen from the left side when viewed from the operator who operates by sitting on the cockpit. FIG. 5b is a front view seen from an operator who sits and operates in the cockpit of the hydraulic excavator excavator. Hereinafter, in the present specification, the terms “left / right” and “front” will be discussed from the cockpit of a hydraulic excavator excavator.

  An excavating blade 503 is provided at the tip of the bucket 500, and when the operator of the ground improvement machine 101 of FIG. 1 operates and moves the hydraulic arm, or the caterpillar of the ground improvement machine 101 with the hydraulic arm fixed. The excavating blade 503 works to excavate the improved soil 100 when moving forward and backward using the. The left side plate 501 and the right side plate 502 constituting the bucket 500 are respectively provided with a left front end side plate 504 and a right front end side plate 505 at the tips thereof to prevent spilling of earth and sand from the sides. The arm mounting portion 506 firmly fixes the bucket 500 and thus the ground improvement stirrer 108 to the arm of the ground improvement machine 101. It is possible to change the bucket type and the rod type depending on the soil conditions, etc., or to change the injection nozzle between the fixed type and the swing type. Because.

  A stirring shaft 507 is provided between the center of the left side plate 501 of the bucket 500 and the center of the right side plate 502 and inside the bucket 500 in a direction perpendicular to the extending direction of the arm. The stirring shaft 507 is rotatable, and a plurality of stirring blades 508 are provided outside the stirring shaft 507. A motor mounting plate 509 that is detachably fixed is provided at the center of either the left side surface or the right side surface of the bucket 500. The removal is made possible for maintenance of the hydraulic motor 510 and the power transmission mechanism 511. As the power transmission mechanism 511, a gear or a sprocket with a chain attached can be used.

  An injection nozzle 512 for injecting the improved material (or water) at a high pressure is provided near the arm attachment portion at the upper part of the bucket 500. In the example of FIG. 5, four are arranged. The direction is such that the improved material is sprayed around the excavation blade 503. The high pressure injection is a pressure of about 5 Mpa to 40 Mpa. In the example of FIG. 5, it is a fixed nozzle. In the case of the fixed type, the number of nozzles is preferably about 2 to 5. Although not clearly shown in FIG. 5, an improvement material supply pipe 513 is provided above the bucket 500 in order to supply the improvement material to the injection nozzle 512.

  FIG. 7 is a view showing a state when the ground improvement method is carried out using a bucket type shallow ground improvement stirrer. As described above, excavation is performed either by operating the hydraulic arm or by moving the ground improvement machine forward or backward with the arm fixed. The excavation work, the high-pressure injection of the ground improvement material from the injection nozzle, and the stirring by the stirrer for shallow ground improvement can be performed in parallel. Actually, the operator who handles the ground improvement machine and the operator who handles the grout pump 102 shown in FIG. 1 perform the ground improvement work in cooperation. There may be an operation in which only stirring is performed, only excavation, or only stirring is performed. By using high-pressure injection, it can be expected to perform more effective excavation using the injection energy.

  FIG. 6 is a diagram showing an embodiment in which stirring blades are provided inside the bucket and two swinging injection nozzles are provided. FIG. 6A is a side view seen from the left side, and FIG. 6B is a view seen from the front side. The configuration of FIG. 6 is almost the same as the configuration of FIG. The difference is that the injection nozzle is not a fixed type but a rocking type, and the number of injection nozzles is two instead of four. Also in the case of the swing type, the injection pressure is 5 MPa to 40 MPa. The number of nozzles is preferably one or two. The number of nozzle oscillations is suitably 30 to 120 cpm (30 to 120 times per minute). The means for swinging the nozzle is a hydraulic motor.

  FIG. 2 is a view showing an embodiment in which a stirring blade is provided in a rod type stirring device and two fixed injection nozzles are provided. 2a is a view from the left side, and FIG. 2b is a view from the front. The stirring device 200 extending in the vertical direction has an improvement material supply pipe 213 therein. A hydraulic motor 214 is provided at the upper end of the agitator 200, and a hydraulic pressure source is supplied from a hydraulic excavator. The stirrer 200 is firmly attached to the arm of the ground improvement machine by the arm attachment portion 206. A drill bit 203 is provided at the lower end of the stirring device 200. An agitation rotating shaft 207 is provided above the excavating bit 203 and extends in a direction perpendicular to the rod 200 through the agitating device 200, and a plurality of agitation blades 208 are provided radially from the agitation rotating shaft 207. .

  The agitation rotating shaft 207 is rotatably provided, and a driving force for rotating it is given by the hydraulic motor 214. The hydraulic motor 214 is fixed to the upper part of the stirring device 200 and is driven by the hydraulic power source of the ground improvement machine 101, and the driving force thereof is a rotating shaft for stirring by the power transmission mechanism 211 (provided inside the stirring device 200). 207. Specifically, the power transmission mechanism 211 includes a gear or a chain and a sprocket.

  An injection nozzle 212 is provided on the agitation device 200 in order to inject the improvement material supplied from the improvement material supply pipe 213 toward the soil stirred by the stirring blade 208 at a high pressure. In the embodiment of FIG. 2, two fixed nozzles are provided. As in Example 1, high pressure injection of 5 MPa to 40 MPa is used.

  FIG. 4 is a view showing a state when the ground improvement method is carried out using a rod-type shallow ground improvement stirrer. Excavation is possible by operating the hydraulic arm or moving the ground improvement machine forward or backward with a caterpillar. The ground improvement work is carried out by excavation by the excavation bit, agitation by the agitating blade, high-pressure injection by the injection nozzle, all three of these, or, if necessary, two of these three.

  FIG. 3 is a view showing an embodiment in which a stirring blade 300 is provided in a rod-type stirring device 300 and one swinging injection nozzle is provided. 3a is a view from the left side, and FIG. 3b is a view from the front. Although it is substantially the same as Example 3 shown in FIG. 2, the difference is that the injection nozzle is a swing type, and the number of injection nozzles is one. As the oscillating nozzle, the same one as described in the second embodiment is used.

  Since the present invention is configured as described above, it can be used not only for ground improvement but also for improvement of contaminated soil by appropriately selecting drugs. Moreover, it can be used not only for improving the shallow ground but also for improving the middle ground. This is because the injection energy can be effectively used by high-pressure injection.

It is a figure which shows the typical system example at the time of actually implementing a ground improvement construction method using this invention. It is a figure which shows the Example which provided the stirring blade in the rod type stirring apparatus, and provided two fixed type injection nozzles. It is a figure which shows the Example which provided the stirring blade in the rod type stirring apparatus, and provided one rocking | fluctuation type injection nozzle. It is a figure which shows the mode at the time of implementing a ground improvement construction method using the stirrer for rod type shallow ground improvement. It is a figure which shows the Example which provided the stirring blade inside the bucket and provided four fixed type injection nozzles. It is a figure which shows the Example which provided the stirring blade inside the bucket and provided two rocking | fluctuation type injection nozzles. It is a figure which shows the mode at the time of implementing a ground improvement construction method using the bucket type shallow ground improvement stirrer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Improvement soil 101 Ground improvement machine 102 Grout pump 103 Mixing plant 104 Flowmeter 105 Generator 106 Cement silo 107 Water tank 108 Ground improvement agitator 200,300 Stirrer 203,303 Excavation bit 206,306 Arm attachment part 207.307 Stirring Rotating shaft 208, 308 Stirring blade 211, 311 Power transmission mechanism 212 Injection nozzle 312 Oscillating injection nozzle 213, 213 Improvement material supply pipe 214, 314 Hydraulic motor 500, 600 Bucket 501, 601 Left side plate 502, 602 Right side plate 503 603 Excavation blades 504, 604 Left tip side plate 505, 605 Right tip side plate 506, 606 Arm mounting portion 507, 607 Stirring shaft 508, 608 Stirring blade 509, 609 Motor mounting plate 510, 610 Hydraulic mode 511, 611 power transmitting mechanism 512 and 612 injection nozzle 513,613 improvement agent supply pipe

Claims (9)

A stirrer for improving the shallow ground, which has a stirring member for stirring the shallow ground in need of improvement and is attached to the tip of the arm of a hydraulic excavator excavator.
A stirrer for improving shallow ground, comprising a high-pressure spraying device for spraying an improved material at a high pressure toward the soil stirred by the stirring member. A stirrer for improving shallow ground according to claim 1,
The high-pressure spraying device has a plurality of fixed nozzles and sprays the improving material at high pressure toward the soil in the range stirred by the stirring member. A stirrer for improving shallow ground according to claim 1,
A stirrer for improving a shallow ground, wherein the high-pressure spraying device has a swinging nozzle and sprays the improving material at a high pressure while swinging toward the soil in a range to be stirred by the stirring member. A stirrer for improving shallow ground according to claim 1,
A bucket having a left side plate and a right side plate on both left and right sides, and a plurality of excavating blades, a left tip side plate, and a right tip side plate
An arm attachment portion for attaching the bucket to the arm;
A stirring shaft that is provided between the center of the left side plate of the bucket and the center of the right side plate, and is provided in a direction perpendicular to the extending direction of the arm inside the bucket, and is rotatable.
A plurality of stirring blades provided outside the stirring shaft;
A motor mounting plate removably fixed to the center of either the left side plate or the right side plate of the bucket;
A hydraulic motor mounted inside the motor mounting plate;
A power transmission mechanism for transmitting the power of the hydraulic motor to the stirring shaft;
An injection nozzle that is provided near the arm mounting portion of the bucket, and injects the improved material at a high pressure toward the vicinity of the excavation blade;
A stirrer for improving a shallow ground, comprising: an improvement material supply pipe provided at an upper portion of the bucket for supplying the improvement material to the injection nozzle. A stirrer for improving shallow ground according to claim 1,
A stirrer having an improved material supply pipe inside and extending in the vertical direction;
An arm attachment portion for attaching the stirring device to the arm;
A drill bit attached to the lower tip of the stirring device;
An agitation rotating shaft that extends above the excavating bit and extends perpendicularly to the agitation device through the agitation device;
A plurality of stirring blades provided on the rotating shaft for stirring;
A hydraulic motor provided in the stirring device;
A power transmission mechanism for transmitting the power of the hydraulic motor to the rotating shaft for stirring;
A shallow ground improvement stirrer comprising: a spray nozzle provided on the stirrer for high-pressure spraying of the improvement material supplied from the improvement material supply pipe toward the soil stirred by the stirring blade.   A shallow ground improvement machine comprising the shallow ground improvement stirrer according to any one of claims 1, 2, 3, 4 and 5 attached to an arm tip of a hydraulic excavator excavator. A shallow ground improvement machine according to claim 6;
A grout pump for supplying an improvement material to a high-pressure spraying device attached to a stirrer for improving the shallow ground of the shallow ground improvement machine;
A mixing plant that supplies the grout pump with a mixture of cement and water;
A shallow ground improvement system comprising: the mixing plant; and a generator for supplying power to the grout pump. A shallow ground improvement method for improving a shallow ground using the shallow ground improvement machine according to claim 6,
A stirring step of stirring the shallow ground in need of improvement using the stirring member;
A shallow ground improvement method comprising: a high-pressure injection step of high-pressure injection of an improved material toward the agitated soil in the stirring step. A contaminated soil improvement method for improving contaminated soil using the shallow ground improvement machine according to claim 6,
An agitation step of agitating contaminated soil requiring improvement using the agitation member;
A contaminated soil improvement method comprising: a high-pressure injection step of high-pressure injection of an improved material toward the soil to be stirred in the stirring step.

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