JP3635264B2 - Expanded excavation bucket, expanded excavation slime processing apparatus, and cast-in-place concrete pile slime processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a large-diameter excavation bucket, a large-diameter excavation slime processing apparatus, and a cast-in-place concrete pile slime treatment method used for removing slime accumulated on the bottom surface of a pile hole when a cast-in-place concrete pile is constructed. About.
[0002]
[Prior art]
In recent years, with vertical and high-rise buildings, foundation piles are required to have high vertical support performance. For such needs, rectangular piles such as large-diameter bottom-expanded piles and continuous underground walls are often adopted.
[0003]
However, in order to construct a rectangular pile, the amount of soil discharged after excavation increases, the amount of stabilizing liquid used to stabilize the pile hole wall surface increases, and naturally the amount of concrete for constructing the rectangular pile increases. For this reason, construction cost becomes high and it has a bad influence also on an environment.
[0004]
Then, as shown in FIG. 10, the cast-in-place concrete which exhibits a high vertical support force is proposed by forming an enlarged diameter part not only in the front-end | tip part of a foundation pile but in an intermediate part. Thereby, since the diameter of the shaft part of cast-in-place concrete can be made small, there is little soil discharge | emission amount, the usage-amount of stabilization liquid can also reduce, and the amount of concrete can be reduced.
[0005]
However, the slime S floating in the stabilizing liquid L filled in the pile hole 44 is deposited not only on the enlarged diameter portion 66 at the bottom of the pile hole 44 but also on the enlarged diameter portion 64 at the intermediate portion. For this reason, in order to ensure a high vertical support force, it is important to treat the slime S deposited or remaining on the enlarged diameter portion 64 of the intermediate portion.
[0006]
As a general slime treatment procedure, after completion of excavation, the primary slime treatment that uses the excavation bucket to dry the bottom of the pile hole, and the concrete was deposited on the bottom from the tip of the tremy pipe using a submersible pump before placing the concrete. There is a secondary slime treatment for sucking slime.
[0007]
However, when the slime S accumulated or remaining in the intermediate enlarged portion 64 is scraped off by the primary slime treatment as described above, the excavation bit provided at the lower portion of the excavation bucket turns to enlarge the diameter. There is a possibility that the bottom surface of the portion 64 is re-excavated, and the enlarged diameter portion 64 cannot be held in a predetermined shape. In addition, there is a possibility that digging waste (slime) may remain in the enlarged diameter portion 64 of the intermediate portion.
[0008]
For this reason, it may be possible to manufacture a dedicated bottom sifting bucket (bucket without a drilling bit in the lower part) for excavating the enlarged diameter part of the middle part. There is a need to produce a plurality of products, which requires enormous costs.
[0009]
Also in the secondary slime treatment, the conventional slime treatment technology has the following problems.
[0010]
For example, as shown in FIG. 11, a blade 70 is attached to the tip of the tremy tube 68, the blade 70 is swung to scrape the slime toward the center, sucked by the submersible pump 72, and discharged to the ground via the hose 74. There is a method (see Japanese Patent Publication No. 4-80167 and Japanese Patent No. 2640841).
[0011]
However, when this construction method is adopted in the enlarged diameter part of the intermediate part, most of the slime is scraped off to the bottom part of the pile hole, and only the labor for reprocessing the slime that has settled on the bottom part is increased. In addition, the slime in the stable liquid takes a considerable time to settle, which affects the work period.
[0012]
In addition, as shown in FIG. 12, in the construction method in which the slime is stirred with the stirring blade 76, suspended in the stabilizing liquid L, and sucked with the submersible pump 78 (see JP-A-5-1419), the process waits until the slime is precipitated. It takes time to process slime.
[0013]
Furthermore, in the above-mentioned two construction methods, in order to cope with the hole diameters of the wide-diameter portion 64 (see FIG. 10) of the various intermediate portions and the inclination angle of the bottom surface of the wide-diameter portion 64, the apparatus must be significantly modified. Therefore, enormous costs are required and the feasibility is poor.
[0014]
In addition, as shown in FIG. 13, in the construction method in which the stabilizing liquid L is jetted from the jet nozzle 80 at a high pressure and the slime S is stirred and suspended and sucked by the submersible pump 82 (see Japanese Patent Laid-Open No. 2000-120067), the jet nozzle Since the liquid pressure is reduced even in the vicinity of 80, there is no ability to wind up the slime S deposited on the outer periphery. Furthermore, a dedicated device is required and the work becomes large, which is not practical.
[0015]
In addition, as shown in FIG. 14, there is also a method of removing slime by attaching a slime stirring device 86 to the submersible pump 84 and moving the inside of the pile hole 88 (JP-A-6-316929, JP-A-11-351178). reference). This method is generally used at present, but even if the submersible pump 84 is moved in the horizontal direction, the slime deposited outside the suction port of the submersible pump 84 (especially the outer peripheral portion of the enlarged diameter portion) is sucked. I can't.
[0016]
[Problems to be solved by the invention]
In consideration of the above facts, in the pile hole in which the enlarged portions are formed not only in the bottom portion but also in the intermediate portion, the slime deposited or remaining on the bottom surface of the enlarged diameter portion is formed in the shape of the enlarged diameter portion. It is an object to perform a primary slime treatment that reliably scrapes off and a secondary slime treatment that evenly sucks the slime that has settled on the bottom surface of the enlarged diameter portion including the bottom portion without changing.
[0017]
[Means for Solving the Problems]
The invention according to claim 1 is a diameter-expanded excavation bucket swingably attached to a swiveling excavation shaft, a diameter-expansion drive means for expanding the diameter-expanded excavation bucket away from the excavation shaft, and Attached to the lower part of the bucket for expanding excavation and touching the bottom of the enlarged part of the middle part of the pile hole filled with stabilizing liquid , scraping the slime accumulated on the bottom of the enlarged part of the intermediate part. And a possible plate material.
[0018]
In the invention with the above configuration, when the diameter-enlarging driving means is operated to separate the diameter-excavating bucket from the excavation shaft, the diameter-excavating bucket expands. When the excavation shaft is turned, the expanded diameter excavation bucket scrapes the hole wall and expands the hole diameter of the pile hole. By changing the amount of expansion of the diameter-excavation bucket, an enlarged portion having an arbitrary size can be formed not only at the bottom of the pile hole but also at the intermediate portion of the pile hole.
[0019]
Here, primary slime is deposited or remains on the bottom surface of the enlarged diameter portion of the intermediate portion. However, if the primary slime is scraped off by swiveling the enlarged diameter excavation bucket, the excavation bit provided at the lower part of the enlarged diameter excavation bucket excavates the bottom surface of the enlarged diameter portion, and changes the shape of the enlarged diameter portion. There is a risk of change.
[0020]
Therefore, by attaching a plate material to the lower portion of the enlarged diameter excavation bucket, the excavation bit is covered, and only the slime deposited on the bottom surface of the enlarged diameter portion can be scraped off by this plate material. As the plate material, a sweeper formed of hard rubber or the like can be used. Since the hard rubber sweeper bends, the slime on the bottom surface of the enlarged diameter portion can be scraped cleanly.
[0025]
The invention according to claim 2 is an intermediate portion of a pile hole filled with a stable liquid by attaching a plate material to a lower portion of a bucket for large-diameter excavation attached to an excavation shaft so as to be swingable, and turning the excavation shaft. The process of scraping the primary slime accumulated on the bottom of the enlarged diameter part of the part, attaching a suction pipe that can be bent or stretched to the suction pipe, inserting the suction pipe into the pile hole, and bending or stretching the suction pipe A step of moving the suction pipe up and down and swirling the secondary slime deposited on the bottom surface of the enlarged diameter portion while changing the suction position.
[0026]
In the invention with the above configuration, when the excavation of the pile hole having the enlarged diameter portion in which the diameter of the pile hole is partially enlarged is completed by turning the enlarged excavation bucket, the enlarged excavation bucket is once pulled up. The plate material is attached to the lower part of the bucket for expanding the diameter excavation.
[0027]
Then, the bucket for expanding digging with the plate material is again inserted into the pile hole, the bucket for expanding digging is expanded and swiveled, and the first slime accumulated on the bottom surface of the enlarged portion of the intermediate part of the pile hole is scraped. Drop. When the primary slime treatment is completed, the suction pipe equipped with the suction pipe is inserted into the pile hole, and the suction pipe is bent or expanded or contracted to expand, and the suction pipe is moved up and down and swiveled while changing the suction position. Suction the second slime that has accumulated on the bottom.
[0028]
Thus, since the suction position can be changed from the outer peripheral portion of the bottom surface to the central portion, there is no portion where slime cannot be sucked.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the slime processing method of the cast-in-place concrete pile which concerns on this form with reference to drawings is demonstrated.
(Structure of bucket for expanding drilling)
As shown in FIGS. 1 to 5, the diameter-excavation bucket 10 includes a bucket body 14 attached to the tip of an earth drill 12 and a swing bit 16 </ b> A attached to the bucket body 14 so as to be swingable. And a diameter expansion bucket 16 attached thereto.
[0030]
The diameter-enlarged bucket 16 has a cell shape that is curved and bulges outward, and is attached to the upper portion of the bucket body 14 so as to be rotatable with a pin. A rod 18 </ b> A of a hydraulic jack 18 attached to the bucket body 14 is rotatably connected to the back surface of the diameter-enlarged bucket 16. By operating the hydraulic jack 18 to expand and contract the rod 18A, the position where the diameter-enlarged bucket 16 is expanded as shown in FIG. It extends to.
[0031]
A bolt hole 26 through which the bolt 24 is inserted is formed in the vicinity of the excavation bid 16 </ b> A of the diameter expansion bucket 16. The sweeper 30 is mounted so that the bolt hole 26 and the insertion hole 28 are aligned.
[0032]
The sweeper 30 is a hard rubber plate, and when attached, the end in the width direction protrudes from the excavation bit 16A, and the end surface is parallel to the surface of the excavation bit 16A. That is, the end surface of the sweeper 30 is in contact with the surface excavated by the excavation bit 16A.
[0033]
Further, a reinforcing presser fitting 32 is attached to the surface of the sweeper 30. The presser fitting 32 has an insertion hole 34. The bolt 24 is inserted into the insertion holes 34, 28 and the bolt hole 26, and tightened with a nut 36 from the back side, so that the sweeper 30 is fixed to the diameter-enlarged bucket 16. Is done.
[0034]
On the other hand, as shown in FIG. 1, the upper portion of the earth drill 12 is connected to a turning device 38. The swivel device 38 is suspended by a crane 40 and is centered in the vertical direction by a positioning arm 42. With such a configuration, the earth drill 12 is lowered while being swung, so that the diameter-excavation bucket 10 digs the pile hole 44 to a predetermined depth. The pile hole 44 is always supplied with a stabilizing liquid L such as bentonite from a supply pipe (not shown) to prevent the hole wall from collapsing.
(Slime suction device)
As shown in FIGS. 6 to 8, in this embodiment, in order to eliminate on-site complexity, the treme tube 46 for placing concrete is used as a suction tube, but a dedicated suction tube is used. It may be.
[0035]
A bifurcated branch pipe 48 is connected to the tip end 46A of the tremy pipe 46 by a connecting fitting (not shown). A suction pipe 50 is connected to the mouth of the branch pipe 48. A joint portion 52 is provided in the central portion of the suction pipe 50, and is configured to be able to bend and stretch around the joint portion 52.
[0036]
A mounting plate 51 is provided at the center of the branch pipe 48. A hydraulic jack 54 is rotatably attached to the mounting plate 51. The rod 54 </ b> A of the hydraulic jack 54 is rotatably connected to the distal end side of the suction pipe 50. Thereby, by extending and contracting the rod 54A, the suction pipe 50 bends and stretches to expand its diameter and change the suction position.
[0037]
On the other hand, the upper part of the tremy tube 46 is connected to the turning device 60, and the tremey tube 46 can be turned in the pile hole 44. Further, a hose 56 is connected to the mouth of the tremmy pipe 46 via the turning device 60, and the slime S sucked in by the suction pipe 50 is discharged to the ground via the tremy pipe 46 by the sand pump 58. be able to.
[0038]
Next, the construction procedure of cast-in-place concrete piles will be described. Here, although the construction method of the non-reinforcing bar cast-in-place concrete pile which does not insert a reinforcing steel cage is demonstrated, the presence or absence of a reinforcing steel cage does not affect the slime processing method of this invention.
[0039]
As shown in FIG. 9A, while the stabilizing liquid L is replenished, the enlarged diameter excavation bucket 10 is lowered while turning to excavate the pile hole 44. Here, at the depth at which the diameter-expanded portion 20 is formed, the diameter-enlarged bucket 16 is expanded stepwise by operating the hydraulic jack 18 to form the diameter-expanded portion 20 that gradually increases in diameter downward. The diameter-enlarged portion 20 is larger in diameter than the shaft portion 22, and the slime S is easily deposited.
[0040]
As shown in FIG. 9B, when excavation is completed to a predetermined depth, the diameter-extended excavation bucket 10 is pulled up and the sweeper 30 is attached to the diameter-expanded bucket 16. Then, as shown in FIG. 9C and FIG. 3, while the depth is measured by a depth meter (matched with depth data when excavated), the diameter-expanding bucket 10 is lowered to a predetermined depth, and the diameter is expanded. The bucket 16 is expanded in diameter so that the end surface 30 </ b> A of the sweeper 30 is in contact with the bottom surface 20 </ b> A of the expanded diameter portion 20. Here, the earth drill 12 is turned to scrape off the primary slime S deposited on the bottom surface 20A. With this sweeper 30, the slime on the bottom surface 20A of the enlarged diameter portion 20 can be scraped cleanly and uniformly.
[0041]
Further, in the present invention, it is only necessary to attach the sweeper 30, and if it is a bucket for large diameter excavation capable of constructing a large diameter portion at the intermediate portion, the diameter expansion method is an upper opening method, a lower opening method, a bit downhill method, etc. Any method can be adopted.
[0042]
When the primary slime treatment is completed, the bucket 10 for expanding excavation is pulled up from the pile hole 44, and the tremey pipe 46 with the suction pipe 50 attached to the tip end is inserted into the pile hole 44 as shown in FIG. 9 (D). Then, it is lowered to the vicinity of the bottom surface of the enlarged diameter portion 20. At this time, the suction pipe 50 is closed (see FIG. 6). Next, the hydraulic jack 54 is operated so that the bending angle of the suction pipe 50 is 180 degrees, and the suction port of the suction pipe 50 is set on the outer peripheral portion of the bottom surface 20A of the enlarged diameter portion 20 based on the value of the depth meter (see FIG. 7). Here, the treme tube 46 is swung, and the secondary slime S accumulated on the outer periphery of the bottom surface is sucked by the sand pump 58 and discharged to the ground.
[0043]
Next, the hydraulic jack 54 is operated to adjust the bending / extension angle, and the depth of the suction pipe 50 is changed to completely remove all the secondary slime S deposited on the bottom surface 20A of the enlarged diameter portion 20 (see FIG. 8). ). This secondary slime treatment method can suck not only the intermediate enlarged portion 20 but also the secondary slime of the bottom enlarged portion 20.
[0044]
In the present embodiment, the joint portion 52 is provided on the suction pipe 50 and the position of the suction pipe 50 is adjusted by bending and stretching, but a mechanism for expanding and contracting the suction pipe itself may be used. Moreover, it is desirable to change the length, shape, diameter, etc. of the branch pipe and the suction pipe according to the shape of the enlarged diameter portion.
[0045]
Next, when the secondary slime treatment is completed, as shown in FIG. 9 (E), the trememy pipe 46 is pulled up, and the suction pipe 50 is removed from the tremy pipe 46 together with the branch pipe 48. Next, as shown in FIG. 9 (F), the tremy pipe 46 is again inserted into the pile hole 44, and the concrete C is put into the tremy pipe 46 and placed.
[0046]
Then, while pulling up the trememy tube 46, the upper part of the pile hole 44 is filled with the concrete C while removing the stabilizing liquid L, and the cast-in-place concrete pile 80 from which the slime is completely removed is constructed as shown in FIG. 9 (G). To do.
[0047]
【The invention's effect】
Since the present invention has the above-described configuration, the slime deposited or remaining on the bottom surface of the enlarged diameter portion can be surely scraped off without changing the shape of the enlarged diameter portion. Moreover, the slime settled on the bottom face of the enlarged diameter part including the bottom part of the pile hole can be sucked evenly.
[Brief description of the drawings]
FIG. 1 is an overall view of an apparatus used when constructing a cast-in-place concrete pile according to the present embodiment.
FIG. 2 is a plan view of the excavation state of the diameter-excavation bucket according to the present embodiment from above.
FIG. 3 is a side view from the side of the primary slime treatment of the enlarged diameter excavation bucket according to the present embodiment.
FIG. 4 is an exploded perspective view of a sweeper attached to a diameter-excavation bucket according to the present embodiment.
FIG. 5 is a perspective view showing a state in which a sweeper is attached to the diameter-excavation bucket according to the present embodiment.
FIG. 6 is a side view showing a state in which the slime processing apparatus for diameter expansion excavation according to the present embodiment is inserted into a pile hole.
FIG. 7 is a side view showing a state in which the slime in the pile hole is sucked in the slime processing apparatus for diameter expansion excavation according to the present embodiment.
FIG. 8 is a side view showing a state where slime in a pile hole is sucked in the slime processing apparatus for expanded diameter excavation according to the present embodiment.
FIG. 9 is an explanatory diagram showing a construction procedure for a cast-in-place concrete pile according to the present embodiment.
FIG. 10 is a cross-sectional view showing a state in which slime is accumulated in a pile hole of a cast-in-place concrete pile.
FIG. 11 is a side view showing a conventional slime processing apparatus.
FIG. 12 is a side view showing a conventional slime processing apparatus.
FIG. 13 is a side view showing a conventional slime processing apparatus.
FIG. 14 is a side view showing a conventional slime processing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Diameter expansion excavation bucket 16 Diameter expansion bucket 18 Hydraulic jack (Expansion drive means)
30 Sweeper (plate material)
38 Turning device (turning means)
40 Lifting means (crane)
46 Suction tube (Tremmy tube)
50 Suction Pipe 52 Joint 54 Hydraulic Jack (Drive Unit)

Claims (2)

A diameter-excavation bucket attached to a swinging excavation shaft so as to be swingable;
Diameter expansion drive means for expanding the diameter expansion excavation bucket away from the excavation shaft;
The slime that is attached to the bottom of the enlarged diameter excavation bucket is in contact with the bottom of the enlarged diameter portion of the intermediate portion of the pile hole that is attached to the lower portion of the bucket for expanding excavation and filled with the stabilizing liquid. Dropable plate material,
A bucket for expanded diameter excavation characterized by comprising: A plate is attached to the lower part of the bucket for large-diameter excavation that is swingably attached to the excavation shaft. Scraping the primary slime,
  Attach a suction pipe that can be bent or stretched to the suction pipe, insert the suction pipe into the pile hole, rotate the suction pipe up and down and swivel while changing the suction position by bending or stretching the suction pipe, Sucking the accumulated secondary slime;
  A method for slime treatment of cast-in-place concrete piles, characterized by comprising:

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