JP6162356B1 - Method for excavating pile bottom sediment and stirring in hole and rotary table device used therefor - Google Patents

Abstract

A pile bottom sediment excavation and agitation method and a rotary table device used for the excavation of pile bottom sediment and the efficiency of backfilling pile holes are provided. The step of fastening a bucket to the tip of a dedicated rod and positioning the bucket on the bottom of the pile, and rotating the bucket positioned on the bottom of the pile to excavate the sediment at the bottom of the pile hole. The step of accommodating in the bucket, the step of pulling up and discharging the accumulated soil accommodated in the bucket, and the discharging of the accumulated soil, a stirring blade is coupled to the tip of the same dedicated rod instead of the bucket When the cement bentonite paste or the like is injected into the pile hole and stirred, the stirring blade coupled to the dedicated rod moves up and down integrally with the dedicated rod in the pile hole while rotating. Stirring and backfilling and solidifying the pile hole. [Selection] Figure 7

Description

  The present invention relates to a pile bottom sedimentation excavation method and an agitation method in a hole, and a rotary table device used therefor.

  When rebuilding a building, the existing building is dismantled and the foundation pile (buried pile) buried in the ground is pulled out. Patent Document 1 has a description related to a drawing work for buried piles.

  In the extraction work for buried piles, a hole (hereinafter referred to as a buried hole) remaining after the buried piles are extracted is backfilled. This backfilling is performed by stirring and solidifying cement bentonite paste or the like in the buried hole.

On the other hand, in the above process, when the buried pile is pulled out, the pile-attached soil falls and the deposited soil remains on the bottom of the pile. For example, the depth of buried piles may be about 10% (about 10m ^{3 for} φ2.0 piles). In such a case, when the above stirring process is performed with the deposited soil left, the deposited soil at the bottom of the pile is solid and cannot be mixed and diffused with the cement bentonite pace.

  Therefore, excavation of pile soil at the bottom of the pile is performed in order to eliminate such inconvenience.

  FIG. 1 is a diagram for explaining the conventional excavation process of pile soil at the bottom of a pile.

  Excavation consisting of a rod 5 and a bucket 6 provided at the tip thereof, as shown in a top view of a heavy machine 4 (earth drill machine, for example, Hitachi Sumitomo Crane: SD-207: 30t class) in the lower right of FIG. The mechanism 10 is suspended from the tip of the heavy machine 4.

  The rod 5 is a square or round iron pipe, and is rotatable about an axis through a rotation mechanism 7 by a motor.

  The excavating mechanism 10 is lowered by the heavy machine 4 through the suspension mouth pipe 3 into the pile hole 1 and reaches the bottom of the pile (FIGS. 1 (2) and (3)). Further, the bucket 6 is rotated by the rotation mechanism 7 to excavate the piled soil 2 at the bottom of the pile and accommodate it in the bucket 6 (FIG. 1 (3)). Next, the bucket 6 containing the sediment 2 is pulled up (FIG. 1 (4)).

  FIG. 2 is a diagram for explaining the discharge of the sediment 2. Following the process of FIG. 1, the bucket 6 containing the sediment 2 pulled up to the ground is retracted from the pile hole position by rotating the heavy machinery 4, the bottom surface of the bucket 6 is opened, and the sediment 2 is discharged.

  FIG. 3 is a diagram for explaining the backfilling of the pile hole 1. Another heavy machine 5 (columnar improvement machine such as Japanese vehicle DH658: 120t class) equipped with a stirring mechanism 20 having blades at the tip of the rod 15 is prepared.

  Another heavy machine 5 in which a stirring mechanism 20 having a stirring member 16 having an air nozzle at the tip is suspended is prepared (FIG. 3 (1)).

  The stirring mechanism 20 is inserted into the pile hole 1 through the mouth tube 3 (FIG. 3 (2)), air is sent by the compressor 19, and air is discharged from the air nozzle of the stirring mechanism 16. The agitation mechanism 16 is moved up and down by the heavy machine 5, and the cement paste injected into the pile hole 1 is rotated and stirred by the rotation mechanism 17 (FIG. 3 (2)). Thereby, it can solidify uniformly with the cement component in the pile hole 1.

JP-A-7-82744

  The pile hole 1 is backfilled and solidified by the above-described conventional method, but the heavy machine 4 that suspends the excavation mechanism 10 for excavation of the sediment 2 at the bottom of the pile and the agitation mechanism 20 for burying the pile hole are suspended. It was necessary to prepare the lowered heavy machinery 5 separately.

  Therefore, in view of the conventional method, an object of the present invention is a pile bottom sediment excavation and in-hole agitation method that enables efficient excavation of pile bottom sediment and backfilling of a pile hole, and a method used for this. It is to provide a rotary table device.

  The first form of the pile bottom sedimentation excavation and stirring method for excavating and removing the soil deposited on the bottom of the pile hole according to the present invention that achieves the above-mentioned object is the method of fastening the bucket to the tip of a dedicated rod, A step of positioning the bucket, a step of rotating the bucket positioned at the bottom of the pile, excavating the sediment soil at the bottom of the pile hole and storing it in the bucket, and lifting and discharging the sediment soil accommodated in the bucket A step of connecting a stirring blade instead of the bucket to the tip of the same dedicated rod after discharging the sedimentary soil, and injecting cement bentonite paste or the like into the pile hole and stirring And a step of moving the stirring blade coupled to the dedicated rod up and down integrally with the dedicated rod in the pile hole, and agitating while rotating to backfill and solidify the inside of the pile hole. To.

  In the first aspect of the pile bottom sedimentation excavation and stirring method for excavating and removing the soil deposited on the bottom of the pile hole according to the present invention that achieves the above object, as a first aspect, a step of backfilling and solidifying the inside of the pile hole The air is discharged horizontally from the stirring blade.

  When the bucket is coupled to the tip of the dedicated rod as the second aspect in the first form of the pile bottom sedimentation excavation and stirring method for excavating and removing the soil deposited on the bottom of the pile hole according to the present invention to achieve the above-mentioned object When the stirring blades are combined instead of the bucket, the dedicated rod is suspended by the same heavy machine.

  A rotary table device for use in a pile bottom sedimentation excavation and agitation method for excavating and removing soil deposited at the bottom of a pile hole according to the present invention that achieves the above object, wherein the pile bottom sediment is excavated on the same dedicated rod. An agitating blade that has a coupling portion that can be coupled by exchanging a bucket to be accommodated and an agitating blade for agitation such as cement bentonite paste for backfilling a pile hole, and coupled to the dedicated rod by the coupling portion Has a rod that is coupled to the tip of the dedicated rod and a blade that extends in four directions at the axial center of the rod, and a main stirring blade that has a plurality of air blowing holes for blowing air horizontally to the blade. It is characterized by that.

  A rotary table device used in a pile bottom sedimentation excavation and stirring method for excavating and removing soil deposited at the bottom of a pile hole according to the present invention that achieves the above-described object, further comprising: The blade has a sub-stirring blade that extends in four directions around the axis and is coupled to the rod at an angle.

  According to the present invention, since a common dedicated rod is used to switch the bucket and the stirring member for excavating the sediment at the bottom of the pile, each dedicated heavy machine is unnecessary, and the pile is originally pulled out. It is possible to continue excavation of pile bottom sediment and agitation in the hole with one general-purpose crane 6 in use, and it is possible to reduce the time and cost required for the construction.

It is a figure explaining the excavation process of the conventional pile bottom sediment. It is a figure explaining discharge of sedimentary soil. It is a figure explaining backfilling of a pile hole. It is a figure explaining the rotary table apparatus according to this invention. It is a figure which further demonstrates the structural example of the excavation mechanism and stirring mechanism in the exclusive rod according to this invention. It is a figure which shows the other structural example of the stirring blade. It is a flowchart which shows the procedure of the pile bottom sedimentation excavation and in-hole stirring method according to this invention. It is a schematic diagram which shows the state in the pile hole accompanying progress of the flowchart of FIG. It is a figure corresponding to step S1-S2 of the flow of FIG. It is a figure corresponding to step S3-S4 of the flow of FIG. It is a figure corresponding to step S5-S6 of the flow of FIG. It is a figure explaining the construction method using the excavation mechanism which consists of the conventional elongate rod and the bucket with which the front-end | tip is equipped. It is a figure which shows burial of a new foundation pile from the extraction of a foundation pile following the construction boat of FIG. It is a case where the rotary table apparatus according to this invention is used, Comprising: It is a figure which shows the state which does not need the backfill of a construction area. It is a figure which shows the burial of a new foundation pile from the extraction of the foundation pile of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the technical scope of the present invention is not limited to these embodiments, but extends to the matters described in the claims and equivalents thereof.

  FIG. 4 is a diagram for explaining a rotary table device according to the present invention. In this rotary table device, a common dedicated rod 25 is used, and a bucket 36 and a stirring blade 38 are switched and coupled to the tip thereof to function as the excavating mechanism 30 and the stirring mechanism 40, respectively.

  4 (1) is a top view when the bucket 36 is detachably coupled to the dedicated rod 25 by the fastening portion 31 to form the excavating mechanism 30, and FIG. 4 (2) is a side view thereof. Further, FIG. 4 (3) shows a side view when the stirring blade 38 is detachably coupled to the dedicated rod 25 by the fastening portion 31 to form the stirring mechanism 40. The dedicated rod 25 is coupled to a rotation mechanism 33 that uses a motor provided in the fixed portion 32 as a driving force.

  The bucket 36 is connected to the dedicated rod 25 when excavating the pile soil 2 at the bottom of the pile. On the other hand, the agitation blade 38 is joined to the dedicated rod 25 when the solidified backfill is uniformly solidified in the pile hole 1.

  FIG. 5 is a diagram for further explaining a configuration example of the excavation mechanism 30 and the stirring mechanism 40 in the rotary table device according to the present invention.

  FIG. 5A is an enlarged view of the distal end portion of the excavating mechanism 30, and the bucket 36 is coupled to the dedicated rod 25 by the fastening portion 31. In the fastening portion 31, the dedicated rod 25 and the bucket 36 are fastened through a pin not shown in the pin hole 37.

  On the other hand, FIG. 5B is an enlarged view of the tip of the stirring mechanism 40, and a stirring blade 38 having blades extending in four directions is coupled to the rod 311. As in the case of the excavating mechanism 30, the connection with the dedicated rod 25 is performed by fastening one side of the rod 311 through a pin (not shown) to the pin hole 37 by the fastening portion 31.

  The stirring blade 38 has a hollow portion and has a plurality of air vent holes 39 opened in the horizontal direction on the side surface of each blade.

  Further, an air hose 41 is connected to the stirring blade 38 along the inside of the dedicated rod 25 that guides the air sent from the compressor 19 (not shown) to the cavity in the stirring blade 38. Thereby, the air sent from the compressor 19 can be discharged in the horizontal direction through the air vent hole 39.

  FIG. 6 is a diagram showing another configuration example of the stirring blade 38. The example shown in FIG. 5 (2) is one stirring blade having blades extending in four directions, but in the example shown in FIG. 6, the stirring blade 38 is fixed to the main stirring blade member 381 at the lowermost end and fixed to the upper portion thereof. A blade member 382 and a sub-stirring blade member 383 at the uppermost part are configured and coupled to the rod 311.

  FIG. 6A is a side view of the stirring blade 38, and FIG. 6B is a top view of the stirring blade 38 viewed from the vertical direction of the rod 311. The main stirring blade member 381 has a blade portion extending in four directions around the rod 311. The main stirring blade member 381 has a plurality of air blowing ports 39 for blowing air in the horizontal direction.

  Air supplied from the compressor 19 (not shown) through the air hose 41 through the rod 311 can be blown out from the air outlet 9 in the horizontal direction. The sub-stirring blade member 383 is tilted in the oblique direction, and applies a lift force that moves the cement bentonite or the like upward by rotation.

  Further, between the main stirring blade member 381 and the sub stirring blade member 383, fixed blade members 382 are provided in four directions around the rod 311 in order to enhance the stirring effect.

  FIG. 7 shows a pile bottom according to the present invention that uses the rotary table device shown in FIG. 4 to replace the functions of the excavation mechanism 30 and the stirring mechanism 40 by replacing the bucket 36 and the stirring blade 18 with the same dedicated rod 25. It is a flowchart which shows the procedure of sedimentation soil excavation and the in-hole stirring method.

  FIG. 8 is a schematic diagram showing a state in the pile hole 1 as the flow diagram of FIG. 7 progresses.

  FIG. 8A schematically shows a cross section of the pile hole 1 in a state where the pile is pulled up. Cement bentonite paste or the like is hardened on the surface layer 1A of the pile hole 1 and looks good. The lower layer 1B is a mixed portion of mud water around the drawn pile (pile circumferential mud water) and cement bentonite paste. Furthermore, in the lower layer 1C, the soil around the piled muddy water and the pulled-out pile is separated and dropped when the pile is pulled up, and becomes the sedimentary soil 2 together with the piled muddy water. The height of the bottom layer 1C is about 1/10 of the pile length.

  9-11 is a figure explaining the process corresponding to the flow of FIG. FIG. 9 is a diagram corresponding to steps S1-S2 of the flow of FIG. FIG. 10 is a diagram corresponding to steps S3-S4 of the flow of FIG. 7, and FIG. 11 is a diagram corresponding to steps S5-S6 of the flow of FIG.

  In order to remove the piled soil 2 at the bottom of the pile, a bucket 36 is coupled to the dedicated rod 25 to form the excavation mechanism 30 (FIG. 9 (1); step S1).

  The dedicated rod 25 is provided with a rotation mechanism 33 that is driven by a motor provided in the fixed bar 32. The rotation of the motor is transmitted through the gear mechanism, and the dedicated rod 25 is rotated. Further, the bucket 36 rotates corresponding to the rotation of the dedicated rod 25. The bucket 36 is moved up and down by the heavy machine 6 integrally with the dedicated rod 25 along the support pillars 30A on both sides.

  9 (2) shows a fixed bar 32 supported by a pair of support pillars 30A. A heavy machine 6 (not shown) hangs a bucket 36 at the tip and suspends a dedicated rod 25, and the mouth tube of the pile hole 1 is shown. The state positioned at 3 is shown.

  Subsequently, the dedicated rod 25 suspended so that the bucket 36 reaches the bottom of the pile hole 1 is lowered by the heavy machine 6, and the dedicated rod 25 is rotated integrally with the bucket 36 by the rotation mechanism 33, and the sediment 2 is placed in the bucket 36. (FIG. 9 (3); step 2).

  At this time, the state of the soil layer on the inner wall of the pile hole is almost the same as the state of FIG. 8 (1) except that the deposited soil 2 is removed as shown in FIG. 8 (2).

  Next, the bucket 36 is lifted along with the support bar 30A by the heavy machine 6 (not shown) along with the support pillar 30A in a state where the excavated sediment 2 is accommodated (FIGS. 10 (4) and (5); step S3. ). Next, the bottom of the raised bucket 36 is opened, and the sediment 2 is discharged (FIG. 10 (6); step S4).

  Next, the stirring blade 18 is exchanged and attached to the same dedicated rod 25 to form the stirring mechanism 40 (FIG. 11 (7); step S5). After injecting cement bentonite paste or the like into the pile hole 1 from which the sediment 2 has been discharged, the stirring mechanism 40 is suspended by the same heavy machine 6 and the stirring blade 38 is positioned in the pile hole 1.

  Further, air is supplied from the compressor 19. At the same time, the agitation mechanism 40 is moved up and down by the heavy machine 6 and the agitation blade 38 is rotated through the rotation of the dedicated rod 25 by the rotation mechanism 33 (FIG. 11 (9); step S6). At this time, the air supplied from the compressor 26 is ejected from the air outlet 39 of the stirring blade 38 in the horizontal direction. Thereby, cement is stirred in the pile hole 1 uniformly. At this time, as shown in FIG. 8 (3), the state of the inner wall of the pile hole is that the deposited soil 2 is removed, and the earth and sand together with the cement bentonite paste and the like are stirred by the stirring blade 38 and simultaneously sprayed horizontally from the air outlet 39. It is possible to approach the almost uniform hardness that is convected by the air that is emitted.

  As described above, in the present invention, the excavation and removal of the residual soil in the pile hole 1 and the cement in the pile hole 1 are performed by switching and coupling the bucket 36 and the stirring blade 38 using the same rotary table dedicated rod 25. Filling with bentonite paste can be performed, and the pile bottom soil can be excavated and the pile hole 1 can be backfilled with one general purpose heavy machine without preparing a separate heavy machine.

  Here, considering the flow of laying of the new foundation pile from the removal of the foundation pile, Fig. 12 shows a construction method in which a conventional excavating mechanism consisting of a long rod and a bucket provided at its tip is suspended from the tip of a heavy machine. Show. As shown in FIG. 12, after removing the structure 40 to the tip of the foundation pile (FIGS. 12A and 12B), the ground pile of about 4 m depth after the removal of the structure 40 is backfilled, It is necessary to make the construction area with a flat end (FIG. 12C).

  Thereby, in FIG. 13 which shows the laying of a new foundation pile from the removal of the foundation pile following the construction method of FIG. 12, the heavy machinery 4 is moved on the construction area where the foundation pile to be removed is moved, and the corresponding foundation pile Removal is possible. Thereafter, a new foundation pile is buried by the large heavy machine 50.

  13A and 13B show a schematic cross-sectional view and a plan view of a construction area with a foundation pile, respectively. Next, excavation is performed again for laying a new foundation pile (FIG. 13C). As described above, in the above-described conventional method, it is necessary to repeat excavation and backfilling in a construction area having a foundation pile to be removed.

  On the other hand, when using the rotary table device according to the present invention, it is possible to avoid repetition of excavation and backfilling.

  That is, the working range can be expanded by suspending the rotary table device according to the present invention with the large heavy machine 50, and the large pile 50 can be used to remove the foundation pile and the new foundation without moving the heavy machine. Pile can be buried.

  In FIG. 14, it is a case where the rotary table apparatus according to this invention is used, Comprising: After removing the structure 40 to a foundation pile front-end | tip part (FIG. 14A, FIG. 14B), the state which does not need a backfill is shown.

In FIG. 15 which shows the laying of a new foundation pile from the removal of the foundation pile, the rotary table apparatus according to the invention is suspended in a large heavy machine 50, and the rotary table apparatus is positioned at the foundation pile position to be removed within the construction area. Is possible. FIG. 15A and FIG. 15B show a schematic cross-sectional view and a plan view of a construction area with a foundation pile, respectively. The radius of the crane tip of the heavy machine 50 (17 m) can cover the foundation pile position in an area of approximately 15 m ² .

  Furthermore, since the backfilling is not performed when a new foundation pile is buried, a new foundation pile can be continuously buried with the same heavy machine 50 (FIG. 15C).

DESCRIPTION OF SYMBOLS 1 Pile hole 2 Pile bottom sediment 3 Mouth pipe 4, 50 Heavy machine 5 Rod 25 Dedicated rod 36 Bucket 17, 33 Rotating mechanism 10, 30 Excavation mechanism 20, 40 Stirring mechanism 30A Support column 311 Rod 31 Fastening part 32 Fixing bar 37 Pin Holes 16 and 38 Stirring blade 19 Compressor 39 Air outlet 41 Air hose

Claims (5)

A pile bottom sedimentation excavation and agitation method for excavating and removing soil deposited at the bottom of a pile hole,
Fastening the bucket to the tip of the dedicated rod and positioning the bucket on the bottom of the pile;
Rotating the bucket positioned at the bottom of the pile, excavating the sediment at the bottom of the pile hole and storing it in the bucket;
Lifting and discharging the sediment contained in the bucket; and
After discharging the deposited soil, a step of connecting a stirring blade to the tip of the same dedicated rod instead of the bucket;
When a cement tobentonite paste or the like is poured into the pile hole and agitated, the stirring blade coupled to the dedicated rod moves up and down integrally with the dedicated rod in the pile hole and is stirred while rotating. And backfilling and solidifying the inside of the pile hole,
Pile bottom sedimentation excavation and in-hole agitation method. In claim 1,
Pile bottom sedimentation soil excavation and in-hole agitation method, wherein air is discharged from the agitating blade in a horizontal direction in the step of solidifying after filling the inside of the pile hole. In claim 1 or 2,
Pile bottom sedimentary soil excavation and hole characterized by hanging the dedicated rod with the same heavy machine both when a bucket is coupled to the tip of the dedicated rod and when a stirring blade is coupled instead of the bucket Internal stirring method. A rotary table device used for the pile bottom sediment excavation and stirring method according to any one of claims 1 to 3,
A bucket that excavates and accommodates pile bottom sediment on the same dedicated rod, and a fastening part that can be connected by exchanging agitation blades for agitation of cement for backfilling the pile hole,
The stirring blade coupled to the dedicated rod by the fastening portion is
A rod coupled to the tip of the dedicated rod;
The blade has a blade extending in four directions at the axial center of the rod, and has a stirring blade provided with a plurality of air blowing holes for blowing air horizontally to the blade.
A rotary table device characterized by that. In claim 4,
Furthermore, the upper part of the stirring blade has a blade that extends in four directions about the axis of the rod, and has a sub-stirring blade that is coupled to the rod at an angle.
A rotary table device characterized by that.

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