JPH0480167B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used to remove slime (hole bottom sediment) accumulated at the bottom of a pile hole when creating cast-in-place concrete piles in civil engineering construction work. It concerns the equipment used.

(Prior art) To create cast-in-place concrete piles, first a pile hole is drilled in the ground to a predetermined depth, then reinforcing reinforcing bars are inserted into the pile hole, and then concrete is poured. When placing this concrete, if slime remains at the bottom of the pile hole, it will adversely affect the bearing capacity of the pile. For this reason, it is necessary to remove the slime at the bottom of the pile hole, but the conventional slime removal method is to insert a tremie pipe into the pile hole until it reaches the bottom, and then use a pump connected to this tremie pipe to remove slime from the pile hole. There are two methods: sucking up the slime along with groundwater that has accumulated at the bottom of the pile hole, and using an air compressor to blow air into the water that has accumulated at the bottom of the pile hole to disperse the slime, or by sending high-pressure water to the bottom of the pile hole.
A method of blowing up the slime using the jet stream is currently in common use.

(Problems to be Solved by the Invention) However, among the conventional methods described above, the first method of sucking up slime using a pump has the problem that only slime near the suction pipe can be removed; The third method is
There is a problem in that the dispersed slime precipitates again, and in any case, it is difficult to remove the slime reliably.

In particular, in the case of an enlarged bottom hole where the bottom of the pile hole is expanded, there is a problem in that it is difficult to sufficiently remove slime from the expanded portion, which is the outer periphery, using conventional methods.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, an electric vertical shaft type submersible pump is provided at the lower end of the Kelly bar, and an input shaft connected to the pump shaft is provided below the submersible pump. and a cyclo reducer having an output shaft protruding downward, a suction cylinder of the submersible pump is provided below the cyclo reducer, and a discharge hose of the submersible pump is extended to the outside of the hole,
A hollow cylindrical rotating body is connected to the output shaft of the cyclo reducer and rotatably provided on the outer periphery of the lower end of the suction cylinder, and a plurality of shafts are provided radially protruding from the outer periphery of the rotating body, A shaft cylinder is fitted to each of these shafts, and the base of a blade that scrapes the slime toward the center is pivotally supported on each shaft cylinder, and a turnbuckle is provided between the blade and the shaft cylinder to form a pile hole. Configure the bottom slime removal device.

(Function) Since the device of the present invention is configured as described above, if this device is connected to the lower end of the Kelly bar and suspended, the blades for scraping slime at the bottom of the device will move around the pivot shaft as a fulcrum. It hangs downward due to its own weight. Therefore, if this device is lowered into the excavated pile hole in this state, there is no risk that the blades will get stuck on the hole wall. When the electric submersible pump is driven while the device is located at the bottom of the pile hole, the rotation of the pump is transmitted via the cyclo reducer to the rotating body provided at the lower end of the suction cylinder. That is, the submersible pump is operated at high speed, and the rotating body is rotated at low speed. If the device is further lowered in this state, the tips of the blades for collecting slime come into contact with the bottom of the pile hole, and then as the device descends, each blade gradually expands until it becomes horizontal. When each blade rotates in a horizontally expanded state, the bottom surface of the pile hole is leveled horizontally by the raking action of each blade, and
The slime on the bottom is scraped towards the center. The scraped slime is sucked in from the suction tube by a submersible pump along with the groundwater accumulated at the bottom of the pile hole, and is discharged out of the hole via a discharge hose.

As described above, according to the device of the present invention, by rotating the slime scraping blade, the bottom of the pile hole is scraped horizontally, the slime on the bottom is scraped to the center, and the slime is pumped into the submersible pump. Since the slime is discharged out of the hole along with the groundwater, not only is the slime removed reliably, but the bottom surface is also properly leveled, making it possible to obtain extremely superior cast-in-place concrete piles.

In addition, the blades for scraping slime of the device of the present invention are automatically folded when hanging or lifting, and the rotation radius of the tip of the blade can be adjusted by the turnbuckle provided on each blade. The device of the present invention can not only cope with a wide variety of changes in the diameter of pile holes, but also can be effective in removing slime from bottomed holes in particular.

(Example) Hereinafter, an example of the apparatus of the present invention will be described with reference to the drawings. In the figure, 1 is the ground, 2 is the pile hole formed by digging the ground 1, 3 is the enlarged hole, 4 is the bottom surface, 5 is the reinforcing reinforcing bar inserted into the pile hole 2, and 6 is the hole for the excavator. It's a Kelly bar.

In this embodiment, an electric vertical shaft type submersible pump 8 is provided at the lower end of the Kelly bar 6 via a joint 7. 7a is the connecting pin of the joint 7, 9 is the electric motor, 10
8a is a power cable of the electric motor 9, and 8a is a pump shaft projecting downward from the vertical shaft type submersible pump 8.

An input shaft 12a is connected to the pump shaft 8a below this submersible pump 8 via a coupling ring 11.
A cyclo reducer 12 having an output shaft 12b protruding downward is provided, a suction tube 13 of the submersible pump 8 is provided below the cyclo reducer 12, and a discharge hose 14 of the submersible pump 8 is guided upward. Extend it to the outside of the hole. Note that 13a is the suction cylinder 1
3 and the suction casing portion of the submersible pump 8.

Further, a hollow cylindrical rotating body 15 and an output shaft 12 of the cyclo reducer 12 are attached to the outer periphery of the lower end of the suction cylinder 13.
b and a wheel-shaped connecting member 16 (see Fig. 2).
The rotating body 1
A plurality of (four in this example) shafts 17 are provided on the outer periphery of the shaft 5.
are protruded radially, a shaft cylinder 18 is fitted to each of these shafts 17, and a pin 20 is attached to the base of a blade 19 that scrapes the slime to the center of each shaft cylinder 18.
This blade 19 and shaft cylinder 18
A turnbuckle 21 is provided between. Note 22
The rotating body 15 is arranged so as to enclose the outer end of the shaft 17.
The center casing is integrally formed with the casing.

Since the device of the present invention is configured as described above, if this device is connected to the lower end of the Kelly bar 6 and suspended, the blades 19 for scraping slime at the bottom of the device can be moved as shown by the two-dot chain line in FIG. As shown, it hangs downward due to its own weight using the pivot shaft 17 as a fulcrum. Therefore, if this device is lowered into the excavated pile hole 2 in this state, there is no risk that each blade 19 will get stuck on the hole wall. When the electric submersible pump 8 is driven while the device is located at the bottom of the pile hole 2, the rotation of the pump 8 is transmitted to the rotating body 15 provided at the lower end of the suction tube 13 via the cyclo reducer 12. can be conveyed to. That is, while the submersible pump 8 is operated at high speed, for example at 1000 rpm, the rotating body 15
rotates at a low speed of 17 rpm, for example. If the device is further lowered in this state, the tips of the blades 19 for scraping slime come into contact with the bottom surface 4 of the pile hole, and then as the device descends, each blade 19 gradually expands until it becomes horizontal. do. When each blade 19 is rotated in the direction of the arrow A in FIG. 2 in a horizontally expanded state, the bottom surface 4 of the pile hole is leveled and , the slime (not shown) on the bottom surface 4 is scraped toward the center. The scraped slime is groundwater accumulated at the bottom of the pile hole (not shown)
At the same time, it is sucked in from the suction tube 13 by the submersible pump 8 and discharged out of the hole via the discharge hose 14. When the slime removal work is completed, the rotation of the submersible pump 8 and the blades 19 are stopped, and the Kelly bar 6 is pulled up.The blades 19 are folded under their own weight, so the device can be pulled out without collapsing the hole wall. be able to.

(Effects of the Invention) As described above, according to the device of the present invention, by rotating the slime scraping blade 19, the bottom surface 4 of the pile hole is scraped horizontally, and the slime on the bottom surface 4 is moved to the center. Since the slime is scraped up and discharged out of the hole together with groundwater by the submersible pump 8, not only is the slime removed reliably, but also the bottom surface 4 is properly leveled, making it an extremely excellent cast-in-place concrete pile. can be obtained.

Also, the blade 1 for scraping slime of the device of the present invention.
9 is automatically folded when hanging or lifting, and the turning radius of the tip of the blade 19 can be adjusted by the turnbuckle 21 provided on each blade 19. Therefore, the device of the present invention can be easily folded in a pile hole. Not only can it accommodate a wide range of changes in diameter, but it also has the excellent effect of being particularly effective in removing slime from enlarged holes.

[Brief explanation of the drawing]

FIG. 1 is an elevational view partially showing the device of the present invention in cross section;
FIG. 2 is a bottom view thereof. 1...Ground, 2...Pile hole, 3...Bottom expansion hole, 4...
...bottom, 5...reinforcing bar, 6...kelly bar, 7...
Joint, 8... Submersible pump, 8a... Pump shaft, 9
...Electric motor, 10...Power cable, 11...Coupling, 12...Cyclo reducer, 12a...
...Input shaft, 12b...Output shaft, 13...Suction cylinder,
14...Discharge hose, 15...Rotating body, 16...
...Connection member, 17...Shaft, 18...Shaft cylinder, 19...
...Blade, 20...Pin, 21...Turnbuckle, 22...Center casing.

Claims (1)

[Claims] 1 An electric vertical shaft type submersible pump is installed at the lower end of the Kelly bar, a cyclo reducer having an input shaft connected to the pump shaft and an output shaft protruding downward is installed below this submersible pump, and below this cyclo reducer Providing a suction cylinder for the submersible pump, and extending a discharge outlet hose of the submersible pump to the outside of the hole;
A hollow cylindrical rotating body is connected to the output shaft of the cyclo reducer and rotatably provided on the outer periphery of the lower end of the suction cylinder, and a plurality of shafts are provided radially protruding from the outer periphery of the rotating body, A shaft cylinder is fitted to each of these shafts, and the base of a blade that scrapes the slime toward the center is pivotally supported on each shaft cylinder, and a turnbuckle is provided between the blade and the shaft cylinder. Features: Slime removal device at the bottom of pile holes.