JP2007255133A - Soil cement preparation device having agitating auxiliary blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soil cement preparation device having an agitating auxiliary blade, capable of shortening build-up time, by preventing build-up failure of a steel pipe, as a result of reducing remaining of a clay mass in soil cement, by validating the entrained rotation preventive function in agitating and mixing. <P>SOLUTION: An excavation blade and a first agitating blade 25 above this excavation blade, are arranged in an exposed tip part of an inner rod 2A on the tip side of an auger rod. This first agitating blade 25 is formed by extending in the outer peripheral direction from the inner rod 2A. A second agitating blade 34 is arranged above its tip part on an outer rod 3A. This second agitating blade 34 is formed by extending in the outer peripheral direction from the outer rod 3A, and also has first auxiliary blades 25a to 25d extended from the first agitating blade 25 and second auxiliary blades 34a and 34b extended from the second agitating blade 34 so as to be opposed to these first auxiliary blades 25a to 25d. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique of soil cement construction work in which a solid solution such as cement milk or bentonite liquid is agitated and mixed (mixed) with soil at a current position, and particularly, a soil cement solidified liquid is agitated and mixed ( The present invention relates to a soil cement forming apparatus provided with an auxiliary stirring blade used for mixing.

  Soil cement is cement-based solidified material or water added to and mixed with soil. Construction methods using this soil cement include a ground improvement method, a mountain retaining method, a foundation pile method, and a backfill method.

  In these soil cement construction methods, cement milk in which a cement-based solidifying material (hereinafter also simply referred to as “solidifying material”) and water are mixed in advance is usually added to the soil.

  Next, the outline of a foundation pile construction method among soil cement construction methods is demonstrated.

  The foundation pile construction method consists of (a) locating piles, (b) assembling machines and plants, (c) creating steel pipes, (d) installing lip pipes, (e) excavating and stirring, (f) building steel pipes And the like. In (b) assembly of the machine / plant, an operation of assembling a pile driving machine and an operation of assembling a plant for adjusting the amount of solidified liquid such as cement milk and bentonite liquid, which are materials for making soil cement, are performed.

  (E) As an auger (excavation stirrer) used in the excavation / stirring process, the one shown in FIG. 10 is known.

  In other words, the auger rod 2 that is disposed on a pile driving machine (excavation stirrer: not shown) so as to be rotatable and movable up and down is provided with a plurality of excavating blades 23 and a plurality (four) at a predetermined interval above the tip (lower part) side. ) Are provided in a direction perpendicular to the rod axis direction.

  In addition, the auger rod is configured as a double tube rod of an inner rod 2A and an outer rod 3A that are rotatable relative to each other, and the excavating blade 23 and the two stirring blades 24, 25 are protruded downward from the outer rod 3A. The agitating blades 34, 35 and 36 are provided on the rod 2A, and are provided on the outer rod 3A. The excavating blade 23 and the stirring blades 24 and 25 provided on the inner rod 2A side and the stirring blades 34, 35, and 36 provided on the outer rod 3A side rotate in opposite directions. That is, in the drawing, the inner rod 2A rotates clockwise (clockwise), and the outer rod 3A rotates counterclockwise (clockwise). This is to prevent stirring and co-rotation by rotating the inner rod 2A and the outer rod 3A in opposite directions. In addition, in the inner rod 2A, the mounting angle of the stirring blade 24 with respect to the rod shaft is provided at a position that is 90 degrees different from that of the excavation blade 23 and the excavation blade 25. Further, in the outer rod 3A, the attachment angle of the excavation blade 35 with respect to the rod shaft is provided at a position that is 90 degrees different from that of the stirring blades 34 and 36.

  Further, an auger rod (inner rod 2A) near the excavating blade 23 is provided with a spout 50 for a solidified material such as cement milk.

(E) In the excavation / stirring step, the pile driving machine applies a rotational force and a feeding force to the auger rod, and rotates the inner rod 2A and the outer rod 3A in opposite directions, and the excavation blade 5 clears the ground. While excavating, solidified liquid such as cement milk and bentonite liquid is ejected from the spout 12, and the soil at the current position is stirred by the stirring blades 24, 25, 34, 35 and 36 together with the solidified liquid such as cement milk and bentonite liquid. Continue to create a length of soil cement pillar to build the steel pipe.
JP-A-5-33341

  By the way, since the conventional stirring blade is installed in the horizontal direction with respect to the rod axis, when the ground is cohesive soil, the inner rod 2A and the outer rod 3A can be rotated together only by rotating them in opposite directions. The prevention does not function effectively, the clay lump remains in the soil cement, the stirring and mixing state is deteriorated, and the strength of the soil cement column is insufficient.

  In addition, (f) during the steel pipe erection process, there is a possibility of causing an erection (press-fit) defect due to a poor agitation.

  Furthermore, conventionally, in order to avoid such problems, it has been necessary to increase the agitation time and the mixing time.

  The present invention has been made in view of such circumstances, and the problem to be solved is to enable a co-rotation preventing function at the time of stirring and mixing, to reduce the residual clay mass in the soil cement, As a result, it is an object of the present invention to provide a soil cement generating apparatus provided with a stirring auxiliary blade capable of preventing a poor installation of a steel pipe and shortening the installation time.

  In order to solve the above-mentioned problems, the following means were adopted when the auxiliary stirring blade of the present invention was provided.

That is, the soil cement forming apparatus provided with the stirring auxiliary blade of the present invention is provided with an auger rod that is arranged to be freely rotated and raised by a pile driving machine and excavates the ground toward the ground, and the auger rod has a distal end portion. A drilling blade and a solidifying material jet outlet are provided, and a plurality of stirring blades are provided above the drilling blade, and the local soil excavated by the drilling blade and the solidifying agent are stirred and mixed to form a soil cement on-site. In soil cement building equipment,
The auger rod includes a double tube rod composed of an inner rod and an outer rod that can rotate in opposite directions, and on the distal end side of the auger rod, the inner rod is exposed from the distal end of the outer rod,
The exposed tip of the inner rod is provided with the excavating blade and a first agitating blade above the excavating blade, the first agitating blade extending from the inner rod in the outer peripheral direction,
On the other hand, the outer rod is provided with a second stirring blade above the tip, and the second stirring blade is formed to extend from the outer rod in the outer circumferential direction,
And a first auxiliary blade extending from the first stirring blade, and a second auxiliary blade extending from the second stirring blade so as to face the first auxiliary blade,
The first auxiliary wing and the second auxiliary wing are provided at intervals that do not come into contact with each other, and their respective leading ends extend to substantially the same plane position (or overlapping position). .

  According to this configuration, when the inner rod and the outer rod rotate in directions opposite to each other, the first auxiliary wing and the second auxiliary are extended to the same plane position (or overlapping position). The blade acts to crush the clay lump that wraps between the first agitating blade and the second agitating blade, thus preventing the soil cement from co-rotating and preventing the clay lump from remaining in the soil cement. Can do.

  Further, in the soil cement forming apparatus provided with the stirring auxiliary blade according to the present invention, at least one of the first auxiliary blade and the second auxiliary blade is provided, and the first auxiliary blade and the second auxiliary blade are alternately arranged in parallel. It is characterized by that.

  According to this configuration, for example, there are two first auxiliary blades extending from one side of the first stirring blade on the inner rod side, and second auxiliary blades extending from one side of the second stirring blade on the outer rod side. When the two pieces are rotated in opposite directions while being alternately arranged in parallel at the positions where their tips overlap each other, the clay lump that wraps around between the first stirring blade and the second stirring blade can be broken into finer pieces. it can.

  According to the present invention, the co-rotation prevention function is enabled at the time of stirring and mixing, the residual clay lump in the soil cement is reduced, and as a result, the poor installation of the steel pipe can be prevented and the installation time can be shortened. It is possible to provide a soil cement generating apparatus provided with wings.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a soil cement forming apparatus provided with an auxiliary stirring blade according to the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment applied to a soil cement forming apparatus equipped with a stirring auxiliary blade of the present invention.

  A soil cement generating device provided with a stirring auxiliary blade is provided with a multi-axis drive device D in a movable base machine A that has an endless track zone and can be appropriately moved to a position for forming a soil cement synthetic pile. It is what.

  The multi-axis drive device D supports the lift base body 1 of the multi-axis drive device D so that it can be moved up and down by a reader L that is established substantially vertically on the base machine A, and is disposed on the top of the reader L. The elevator base body 13 is moved up and down along the leader L by winding and unwinding the rope W stretched between the sheave S1 and the sheave S2 provided in the elevator base body 13.

  The multi-axis drive device D includes a lifting / lowering base body 1, a lifting / lowering frame 13 attached to the lifting / lowering base body 1 through a lifting machine 12 made of a hydraulic cylinder or the like so as to be movable toward and away from the lifting / lowering body. An inner tube driving device 20 that is disposed on the main body 1 and that rotates and drives the inner tube 2 that constitutes one of the double tube rods, and an elevating frame 13 that is mounted on and supported by the double tube rod. The other side, the outer tube driving device 30 that locks and rotates the outer tube 3 inserted through the inner tube 2, and is mounted and supported on the lifting frame 13, and the hollow steel tube 4 is locked when built. And the hollow tube drive device 40 that is rotationally driven, and the rotational direction and rotational speed of each of the drive devices 20, 30, and 40 can be arbitrarily set independently.

  In this case, the elevator base body 1 of the multi-axis drive device D is provided with a guide rail 11 in the vertical direction, and the lift frame is movable up and down with respect to the guide rail 11 via a guide roller (not shown). 13, and the lifting frame 13 is guided to the guide rail 11 through a lifting machine 12 composed of a hydraulic cylinder or the like attached between the lifting platform body 1 and the lifting frame 13. , And can be moved up and down in the range of 500 to 800 mm.

  Further, the inner pipe 2 and the outer pipe 3 and the steel pipe 4 constituting the double pipe type rod (auger rod) are successively added so that a soil cement having a predetermined depth can be formed.

  In addition, the structure of the connection part of the inner pipe 2, the outer pipe 3, and the steel pipe 4 will not be specifically limited if a predetermined rotational force can be transmitted, Conventionally well-known arbitrary connection mechanisms (inner pipe 2) In the case of the outer pipe 3 and the outer pipe 3, it is possible to adopt one that can be disconnected, and in the case of the steel pipe 4, one that can be permanently connected such as welding.

While the excavating blade 23, the first stirring blades 24, 25, and the second stirring blades 34, 35, 36 are attached to the inner tube 2 and the outer tube 3 constituting the double tube rod, respectively, while excavating the ground, A curable material can be poured into the excavated soil in the pile hole from the chemical solution supply hole 50 of the inner pipe 2 and stirred.
[Description of double tube rod (auger rod)]
Next, a double tube rod will be described with reference to FIG.

  The double tube rod is composed of an inner rod 2A and an outer rod 3A that can rotate in opposite directions. At the tip of the double tube rod, the inner rod 2A is exposed from the tip of the outer rod 3A, The exposed tip of the rod 2A is provided with a drilling blade 23 and first stirring blades 24, 25 above the drilling blade 23. The first stirring blades 24, 25 extend from the inner rod 2A in the outer circumferential direction. It is formed out.

  The excavation blade 23 has a plurality of excavation blades.

  Further, the first stirring blades 24 and 25 are formed in a flat plate shape, and are joined at an angle of about 5 to 10 ° with respect to the horizontal position at the joint portion with the inner rod 2A.

  On the other hand, the outer rod 3A is provided with second stirring blades 34, 35, 36 above the tip thereof, and the second stirring blades 34, 35, 36 are formed to extend from the outer rod 3A in the outer peripheral direction. Has been. The second stirring blades 34, 35, and 36 are also formed in a flat plate shape, and are joined at an angle of about 5 to 10 ° from the horizontal position at the joint portion with the outer rod 3A.

  Furthermore, first auxiliary blades 25a to 25d extending from the first stirring blade 25, and second auxiliary blades 34a and 34b extending from the second stirring blade 34 so as to face the first auxiliary blades 25a to 25d, It has. The first auxiliary wings 25a to 25d and the second auxiliary wings 34a and 34b are provided at intervals that do not come into contact with each other, and extend to positions where their respective tip portions overlap. In addition, each front-end | tip part is not limited to the structure which overlaps, What is necessary is just the structure which each front-end | tip part has extended to the position of the substantially same surface.

  In this embodiment, the four first auxiliary blades 25a to 25d and the two second auxiliary blades 34a and 34b are alternately arranged in parallel. The number of the first auxiliary wings and the second auxiliary wings is not limited to four or two. At least one of the first auxiliary wings and the second auxiliary wings is provided. What is necessary is just the structure which the 2nd auxiliary | assistant wing | blade alternates in parallel.

  As shown in FIG. 9, in the double tube rod, the inner rod 2A rotates clockwise (clockwise) and the outer rod 3A rotates counterclockwise (clockwise). This is to prevent stirring and co-rotation by rotating the inner rod 2A and the outer rod 3A in opposite directions. In addition, in the inner rod 2A, the mounting angle of the stirring blade 24 with respect to the rod shaft is provided at a position that is 90 degrees different from that of the excavation blade 23 and the excavation blade 25. Further, in the outer rod 3A, the attachment angle of the excavation blade 35 with respect to the rod shaft is provided at a position that is 90 degrees different from that of the stirring blades 34 and 36.

  Further, a double pipe rod (inner rod 2A) near the excavating blade 23 is provided with a spout 50 for a solidified material such as cement milk.

  Furthermore, the lower end (tip) of the inner rod 2A protruding downward from the outer rod 3A of the double tube rod is formed in a conical shape so that the hard intermediate layer and the hard support layer can be reliably excavated and stirred. is doing.

  Further, when the soil cement composite pile is constructed, the lifting frame 13 is moved with respect to the lifting platform main body 1 by driving a lifting machine 12 composed of a hydraulic cylinder or the like attached between the lifting platform main body 1 and the lifting frame 13. By lowering by a predetermined distance, the hollow tube 4 made of a steel pipe or the like is lowered with respect to the double-tube rod composed of the inner tube 2 and the outer tube 3 so that the diameter is larger than the inner diameter of the hollow tube 4. The formed excavation stirring blades 24, 25, and 34 are brought into contact with the lower end of the hollow tube 4 and swung, and the double tube rod is pulled out from the hollow tube 4 so that the hollow tube 4 remains in the ground. This makes it possible to construct a soil cement composite pile.

  The inner pipe driving device 20 disposed in the lifting / lowering base body 1 is composed of one hydraulic motor 21 (in this case, the inner pipe driving device 20 may be constituted by two or more hydraulic motors as necessary. And a rotary 22 connected from the hydraulic motor 21 via power transmission means (not shown) such as a gear, and a chucking device for holding the upper end of the inner pipe 2 is provided on the rotary 22. The axial force applied to the inner tube 2 (in this embodiment, the inner tube 2 and the outer tube 3) is supported by the lifting / lowering base body 1, and thereby, the inner tube 2 (in this embodiment) Enables the inner tube 2 and the outer tube 3) to be lifted and lowered together with the lifting / lowering base body 1 while being suspended and supported by the lifting / lowering base body 1.

  Further, as shown in FIG. 7, the outer tube driving device 30 disposed on the lifting frame 13 includes two hydraulic motors 31 and 31 (in this case, one outer tube driving device 30 or And three or more hydraulic motors), drive gears 32, 32 attached to the hydraulic motors 31, 31, and an annular collar 33 that meshes with and rotates with the drive gears 32, 32. Consists of. The annular collar 33 meshes the external teeth 33a formed on the outer peripheral surface of the upper portion with the teeth 32a of the drive gear 32, and further forms internal teeth 33b on the inner peripheral surface of the collar 33. By engaging the teeth 33b with the external teeth 3a formed on the outer peripheral surface of the upper portion of the outer tube 3 (outer tube extension member 3B) inserted through the collar 33, the collar 33 and the outer tube 3 are vertically moved. Even if it moves relatively, the collar 33 and the outer tube 3 can be relatively slidably moved while the inner teeth 33b of the collar and the outer teeth 3a of the outer tube 3 are always meshed with each other. This rotational driving force can be transmitted to the outer tube 3 through a collar 33 having a driving gear 32 and teeth 33a and 33b.

  Further, as shown in FIG. 8, the hollow tube driving device 40 disposed in the elevating frame 13 includes two hydraulic motors 41 and 41 (in this case, the hollow tube driving device 40 includes 1 Or three or more hydraulic motors), drive gears 42 and 42 attached to the hydraulic motors 41 and 41, and external teeth 43a meshing with the teeth 42a of the drive gear 42. An annular gear 43, a rotary 44 attached to the lower part of the annular gear 43 and rotating together with the gear 43, and a holder 45 fixed to the lower part of the rotary 44. The rotary 44 transmits the rotational driving force of the hydraulic motor 41 to the holder 45 fixed to the lower portion of the rotary 44 via the drive gear 42 and the annular gear 43, and the holder 45 is connected to the upper end of the steel pipe 4. By locking the portion, it can be rotated and supported, and the axial force applied to the steel pipe 4 is supported by the lifting frame 13, whereby the steel pipe 4 is suspended and supported by the lifting frame 13. The elevating frame 13 can be moved up and down.

Thus, in the present embodiment, the lift frame 13 is provided with the two hydraulic motors 31 and 31 constituting the outer pipe driving device 30 and the two hydraulic motors 41 and 41 constituting the steel pipe driving device 40.
Are arranged so as not to interfere with each other and are transmitted to the rotary 44 side via the collar 33 or the annular gear 43, so that a predetermined large torque can be easily obtained and the balance of the driving device can be obtained. Can be improved.

  Next, a method for creating a soil cement composite pile using the soil cement production apparatus having the auxiliary wing will be described.

  The lifting / lowering base body 1 of the multi-axis drive device D is supported by the reader L which is established substantially vertically on the base machine A so as to be able to be lifted and lowered, and the sheave S1 disposed on the top of the leader L, and the lifting / lowering base The elevator body 13 is moved up and down along the leader L by winding and unwinding the rope W stretched between the sheaves S2 provided in the body 13. The inner tube 2 constituting one of the double tube rods (auger rods) is connected to the rotary 22 of the inner tube drive device 20 of the triaxial drive device D, and the double tube rods are connected to the collar 33 of the outer tube drive device 30. The outer tube 3 constituting the other of the two is locked, and the inner tube 2 and the outer tube 3 constituting the double tube rod are coaxially installed while maintaining concentricity. And as shown in FIG. 1, the base machine A is moved and set to the position which builds a soil cement synthetic | combination pile.

  Next, the rotational directions and rotational speeds of the hydraulic motors 21 and 31 of the drive devices 20 and 30 of the inner tube 2 and the outer tube 3 constituting the double-pipe rod are respectively independent according to the properties of the ground. The inner pipe 2 chemical solution is excavated by the inner pipe 2 and the outer pipe 3 to which the excavating blade 23, the first stirring blades 24, 25, and the second stirring blades 34, 35, 36 are respectively attached. Soil cement composite piles are created by injecting and agitating curable material into the excavated soil in the pile hole from the supply hole 50, pushing the steel pipe 4 and excavating it to a predetermined depth, and then building the steel pipe 4 in the ground. To do.

  And according to the configuration of this embodiment, when the inner rod 2A and the outer rod 3A rotate in opposite directions, their tips extend to the same plane position (or overlapping position). The first auxiliary blade and the second auxiliary blade act to break up the clay lump that wraps between the first stirring blade and the second stirring blade, thereby preventing the soil cement from co-rotating and preventing the clay lump from being contained in the soil cement. Can be prevented from remaining on the surface.

  Further, according to the configuration of this embodiment, there are two first auxiliary blades extending from one side of the first stirring blade on the inner rod side, and the first auxiliary blades extending from one side of the second stirring blade on the outer rod side. When two auxiliary blades are rotated in opposite directions with one auxiliary blade being alternately arranged in parallel with each other at the tip end, the clay lump that wraps between the first stirring blade and the second stirring blade becomes finer. Can be crushed.

It is a front view which shows one Example applied to the soil cement formation apparatus provided with the stirring auxiliary blade of this invention. A multi-axis drive device is shown, (A) is a front view, (B) is a side view. The state in which the raising / lowering frame was separated from the raising / lowering base body of the multi-axis drive device is shown, (A) is a front view, and (B) is the side view. The state which attached the inner pipe | tube to the raising-lowering base main body of a multi-axis drive device is shown, (A) is a front view, (B) is a side view. The state which attached the outer pipe | tube to the raising / lowering frame of a multi-axis drive device is shown, (A) is a front view, (B) is a side view. The state which attached the hollow tube to the raising / lowering frame of a multi-axis drive device is shown, (A) is a front view, (B) is a side view. An outer tube drive device is shown, (A) is a front view and (B) is a sectional view by a BB line. A hollow tube drive device is shown, (A) is a front view, (B) is sectional drawing by CC line. It is an external view of a double tube type rod (auger rod) provided with a stirring auxiliary blade. It is an external view of the conventional double tube | pipe type rod (auger rod).

Explanation of symbols

A Base machine D Multi-axis drive device L Leader W Strip 1 Lifting base body 12 Lifting machine 13 Lifting frame 2 Inner tube 2A Lower end member 2B Extension member 2C Intermediate member 20 Inner tube drive device 21 Hydraulic motor 22 Rotary (inner tube chuck) King device)
23 Excavation blades 24, 25 First stirring blades 25a to 25d First auxiliary blades 26 Locking tool 3 Outer tube 3A Lower end member 3B Extension member 30 Outer tube drive device 31 Hydraulic motor 32 Drive gear 33 Collar 34, 35, 36 Second Stirring blades 34a, 34b Second auxiliary blade 4 Steel pipe 40 Steel pipe drive device 41 Hydraulic motor 42 Drive gear 43 Gear 44 Rotary 45 Holder 50 Chemical solution supply hole

Claims (3)

The auger rod is arranged to be rotatable and raised by a pile driving machine, and excavates the ground toward the ground, and a drilling blade and a solidified material outlet are provided at the tip of the auger rod. In the soil cement forming apparatus for providing a plurality of stirring blades, stirring and mixing the local soil excavated by the excavating blade and the solidifying agent, and forming the soil cement in-situ,
The auger rod includes a double tube rod composed of an inner rod and an outer rod that can rotate in opposite directions, and on the distal end side of the auger rod, the inner rod is exposed from the distal end of the outer rod,
The exposed tip of the inner rod is provided with the excavating blade and a first agitating blade above the excavating blade, the first agitating blade extending from the inner rod in the outer peripheral direction,
On the other hand, the outer rod is provided with a second stirring blade above the tip, and the second stirring blade is formed to extend from the outer rod in the outer circumferential direction,
And a first auxiliary blade extending from the first stirring blade, and a second auxiliary blade extending from the second stirring blade so as to face the first auxiliary blade,
The soil cement provided with the stirring auxiliary wing characterized in that the first auxiliary wing and the second auxiliary wing are provided at intervals that do not contact each other, and the respective leading end portions extend to substantially the same plane position. Creation device.   2. The soil cement forming apparatus having an agitation auxiliary wing according to claim 1, wherein the first auxiliary wing and the second auxiliary wing extend to a position where their tip ends overlap each other.   The agitation according to claim 1 or 2, wherein at least one of the first auxiliary wing and the second auxiliary wing is provided in plural, and the first auxiliary wing and the second auxiliary wing are alternately arranged in parallel. Soil cement construction equipment with auxiliary wings.

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