JP3866744B2 - Slime processing equipment for diameter expansion drilling - Google Patents

Description

  The present invention relates to a slime processing apparatus for diameter expansion excavation that is used to remove slime accumulated on the bottom surface of a pile hole when a cast-in-place concrete pile is constructed.

  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.

  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.

  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.

  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.

  As a general slime treatment procedure, after the 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.

  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.

  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.

  Also in the secondary slime treatment, the conventional slime treatment technology has the following problems.

  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).

  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.

  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.

  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.

  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.

  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.

  In consideration of the above fact, in the pile hole in which the enlarged portions are formed not only in the bottom portion but also in the intermediate portion, the present invention sucks the slime settled on the bottom surface of the enlarged portion in the intermediate portion evenly. Is an issue.

  The invention according to claim 1 is inserted into a stabilizing liquid filled in a pile hole and sucks a slime, a branch pipe connected to the suction pipe and having a mouth branching, and the branch pipe A suction pipe that is attached to each of the mouth portions and can be bent or stretched to or from a suction position where the slime accumulated on the bottom surface of the enlarged diameter portion of the intermediate portion of the pile hole can be sucked, and the suction pipe is bent or stretched or stretched. Drive means for changing the position, turning means for turning the suction pipe, and lifting means for raising and lowering the suction pipe.

  In the invention of the above configuration, the suction pipe is bent or stretched or contracted to the suction position where the slime accumulated on the bottom surface of the enlarged diameter portion of the intermediate portion of the pile hole can be sucked by operating the driving means. After that, the suction pipe is moved up and down and swiveled by the lifting means and the swiveling means, so that the slime accumulated on the bottom surface of the enlarged diameter portion of the intermediate portion accumulated in the enlarged diameter portion of the pile hole can be sucked uniformly by the suction pipe. it can.

  Since each of the suction pipes is attached to a branch pipe with a mouth branching, it is more efficient than attaching a single suction pipe to the mouth and sucking a secondary slime.

  Since this invention set it as the said structure, the slime settled on the bottom face of the enlarged diameter part of the intermediate part of a pile hole can be attracted | sucked uniformly.

Hereinafter, a slime processing method for cast-in-place concrete piles in which a slime processing apparatus for diameter expansion excavation according to an embodiment of the present invention will be described with reference to the drawings.
(Structure of bucket for expanding drilling)
As shown in FIGS. 1 to 5, the bucket 10 for expanding digging has a bucket body 14 attached to the tip of an earth drill 12, and a drill bit 16 </ b> A is attached to the bucket body 14 so as to be swingable. And a diameter expansion bucket 16 attached thereto.

  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.

  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.

  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.

  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.

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 ground drill 12 is lowered while being swung, whereby the bucket for diameter expansion excavation 10 digs down the pile hole 44 to a predetermined depth. Note that a stabilizing liquid L such as bentonite is always supplied to the pile hole 44 from a supply pipe (not shown) to prevent the hole wall from collapsing.
(Slime suction device)
Next, a slime suction device as a slime processing device for expanded diameter excavation will be described.

  As shown in FIGS. 6 to 8, in this embodiment, in order to eliminate on-site complexity, the tremy tube 46 for placing concrete is used as a suction tube, but a dedicated suction tube is used. It may be.

  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.

  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.

  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.

  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.

  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.

  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 off uniformly and uniformly.

  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.

  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.

  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.

  In the present embodiment, the joint portion 52 is provided in 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.

  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.

  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.

It is a general view of the apparatus used when constructing the cast-in-place concrete pile concerning this form. It is a top view from the upper side of the excavation condition of the bucket for diameter expansion excavation concerning this form. It is a side view from the side for the primary slime process of the bucket for diameter expansion excavation concerning this form. It is a disassembled perspective view of the sweeper attached to the bucket for diameter expansion excavation which concerns on this form. It is a perspective view which shows the state by which the sweeper was attached to the bucket for diameter expansion excavation which concerns on this form. It is a side view which shows the state which has inserted the slime processing apparatus for diameter expansion excavation which concerns on this form into a pile hole. It is a side view which shows the state which is sucking the slime of a pile hole with the slime processing apparatus for diameter expansion excavation which concerns on this form. It is a side view which shows the state which is sucking the slime of a pile hole with the slime processing apparatus for diameter expansion excavation which concerns on this form. It is explanatory drawing which shows the construction procedure of the cast-in-place concrete pile which concerns on this form. It is sectional drawing which shows the state in which the slime has accumulated in the pile hole of the cast-in-place concrete pile. It is a side view which shows the conventional slime processing apparatus. It is a side view which shows the conventional slime processing apparatus. It is a side view which shows the conventional slime processing apparatus. It is a side view which shows the conventional slime processing apparatus.

Explanation of symbols

38 Turning device (turning means)
40 Crane (lifting means)
46 Tremy tube (suction tube)
48 Branch pipe 50 Suction pipe 54 Hydraulic jack (drive means)

Claims (1)

A suction tube that is inserted into a stabilizing liquid filled in the pile hole and sucks slime;
A branch pipe connected to the suction pipe and having a mouth branch;
A suction pipe that is attached to the mouth part of the branch pipe and can bend or stretch to the suction position where the slime accumulated on the bottom surface of the enlarged diameter part of the intermediate part can be sucked or stretched,
Driving means for bending or expanding or contracting the suction pipe to change the suction position;
Swivel means for swiveling the suction pipe;
Elevating means for moving the suction pipe up and down;
A slime processing apparatus for diameter expansion excavation characterized by having.

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