JPH07166548A - Slime removing device - Google Patents

Abstract

PURPOSE:To completely and quickly remove the slime accumulated at the bottom section of an excavated hole. CONSTITUTION:This slime removing device is constituted of a suction pipe 3, a suction pump 4 provided at the upper section of the suction pipe 3, a separation chamber 6 provided at the discharge port of the suction pump 4, a slime storage chamber 8 formed below the separation chamber 6, and a slurry discharge port 7 bored on a casing 2 of the separation chamber 6 and the slime storage chamber 8. The slurry constituent is separated from the slime sucked by the suction pump 4, the slurry is discharged into an excavated hole A from the slurry discharge port 7, and slime is stored in the slime storage chamber 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slime removing device applied to a ground drilling method or the like in construction of cast-in-place concrete piles.

[0002]

2. Description of the Related Art Conventionally, in the construction of cast-in-place concrete piles by the earth drilling method, an earth drilling bucket having a bottom lid having a conical drilling blade is used to drill a drilling hole having a basic diameter to a predetermined depth. After excavation, the excavated earth and sand flowing out from the side cutter opening and bottom lid opening of the earth drill bucket for excavation and accumulated on the bottom of the excavation hole are dredged using a bottom dredging bucket, and the excavation hole bottom is shaped. After that, the reinforced basket is inserted and the concrete is poured. By the way, the above-mentioned bottom dredging bucket, like the earth drill bucket for excavation, has a type in which a shutter for preventing backflow of the excavated earth and sand contained in the bucket is attached to the bottom lid opening by a hinge. In this conventional method, it took time to remove the excavated soil, and it was difficult to completely remove the excavated soil. Then, the excavated soil that could not be removed was accumulated as slime on the bottom of the excavation hole, and there was a risk that the quality of the placed concrete piles would be deteriorated.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a slime removing apparatus capable of completely and quickly removing slime deposited on the bottom of a drill hole.

[0004]

In order to achieve the above object, the slime removing device of the first aspect of the present invention is connected to a suction pipe, a suction pump provided above the suction pipe, and a discharge port of the suction pump. The gist of the present invention is that it comprises a separation chamber, a muddy water discharge port formed in a casing of the separation chamber, and a slime storage chamber formed below the separation chamber.

A second aspect of the present invention is characterized in that, in the slime removing apparatus of the first aspect, a muddy water discharge port is bored in the casing of the slime storage chamber.

Further, the gist of the third invention is that a hole wall protection plate is arranged on the outer periphery of the muddy water discharge port of the slime removing device of the first invention or the second invention.

Further, the gist of the fourth invention is that the widening vanes are arranged to be expandable and contractable in the casing of the slime removing apparatus of the first invention, the second invention or the third invention.

[0008]

[Operation] The slime removing device of the present invention configured as described above is attached to the tip of a kelly bar after the completion of excavation work using an earth drill bucket for excavation, is lowered to the bottom of the drill hole, and is deposited on the bottom of the drill hole. Slime is sucked from the suction pipe by a suction pump provided above the suction pipe, and muddy water components (including fine solid components) are separated from the sucked slime in a separation chamber connected to the discharge port of the suction pump. The muddy water is discharged into the excavation hole from the muddy water discharge port formed in the casing of the separation chamber, and the slime is stored in the slime storage chamber formed below the separation chamber. Then, when the suction pump is driven for a required time to store the entire amount of slime accumulated at the bottom of the drilled hole in the slime storage chamber, the kelly bar is pulled up to complete the slime removal step.

When the casing of the slime accommodating chamber is provided with a muddy water discharge port, a part of the muddy water is introduced into the slime accommodating chamber formed below the separation chamber together with the slime, and then the muddy water is introduced into the slime accommodating chamber. The slime can be stored more smoothly by discharging it into the excavation hole from the muddy water discharge port provided in the casing.

Further, when the hole wall protection plate is arranged on the outer periphery of the muddy water discharge port, it is possible to prevent the muddy water discharged from the muddy water discharge port from directly colliding with the hole wall to prevent the hole wall from collapsing.

Further, in the case where the widening vanes are arranged in the casing so as to be freely expandable and contractible, by expanding the widening vanes, it is possible to remove the slime accumulated on the bottom of the expanded bottom portion of the excavation hole.

[0012]

The present invention will be described below with reference to the illustrated embodiments.

1 to 6 show a slime removing device according to a first embodiment of the present invention. Like the earth drill bucket for excavation, the slime removing device 1 is hung on the sheave at the upper end of the boom of the working machine, and is supported by a wire rope operated by a winch.
It is attached to the lower end of the kelly bar 11 driven by.

The slime removing device 1 has a cylindrical casing 2 and a suction pipe 3 having a suction port 3a for sucking slime accumulated on the bottom of the excavation hole at a lower end provided substantially concentrically with the cylindrical casing 2.
A suction pump 4 having an impeller 4a provided above the suction pipe 3, a suction pump drive motor 5 for driving the suction pump 4, and a separation chamber 6 connected to a discharge port of the suction pump 4.
And the muddy water discharge port 7 formed in the casing 2 of the separation chamber 6.
And a slime accommodating chamber 8 formed below the separation chamber 6 and a hole wall protection plate 9 that prevents the discharged muddy water formed on the outer periphery of the muddy water discharge port 7 from directly hitting the hole wall and collapsing the hole wall.
And a bottom cover 10 having a substantially conical shape that is openably and closably supported by the casing 2 by a hinge 10a, and slime accumulated on the bottom of the bottom of the excavation hole that is arranged to expand and contract on the outer periphery of the casing 2 at the center of the excavation hole. It is composed of the widening blades 12 and the like which are drawn up to the portion.

In the present embodiment, the suction pump 4 is of the centrifugal pump type having five impellers 4a, but is not limited to this, and the suction pipe sucks the slime deposited on the bottom of the drill hole. Any type of pump may be used as long as it is possible.

The suction pump drive motor 5 can use a hydraulic motor or an electric motor. In this case,
Pressure oil or electricity is supplied from the ground by hoses or cables.

At the muddy water discharge port 7 formed in the casing 2, a screen 7a composed of wire mesh, punching metal, lattice, etc. is provided to separate muddy water components from the sucked slime, and the muddy water is discharged from the muddy water discharge port 7. It should be released into the drill hole A. In this case, the material of the screen 7a, the aperture ratio, the hole diameter, etc. can be arbitrarily selected according to the type of slime. Further, it is desirable that the screen 7a, together with the hole wall protection plate 9, be configured so as to be easily removable from the casing 2. Further, the position where the muddy water discharge port 7 is bored is not limited to the position shown in the figure, and it is also possible to use the casing 2a above the separation chamber 6, and in this case, the hole wall protection plate 9 is used. It can be omitted.

Between the separation chamber 6 and the slime storage chamber 8,
The horizontal portions 15a and 15c are connected by the inclined portion 15b, and a partition wall 15 having a shape in which a plurality of the horizontal portions 15a and 15c are connected is formed.
5 a gap 15d between adjacent horizontal portions 15a and 15c
The slime separated from is stored in the slime storage chamber 8.

The hole wall protection plate 9 formed on the outer periphery of the muddy water discharge port 7 is arranged so as to have a proper gap with the outer peripheral surface of the casing 2 via the spacer 9a, and the muddy water is passed through this gap to the excavation hole A. The muddy water discharged from the muddy water discharge port 7 directly collides with the hole wall to prevent the hole wall from collapsing.

The bottom cover 10 having a substantially conical shape is, for example, divided into two parts, and is pivotally supported at the lower end of the suction tube 3 by a hinge 10a, and is attached to a locking tool 10b provided on the casing 2. It can be closed by being locked by the pin 10e. Further, the bottom lid 10 is provided with a reinforcing rib 10c and a scraper 10d for scraping slime accumulated on the bottom of the excavation hole A toward the center of the excavation hole A.

Widening blades 12 arranged on the outer periphery of the casing 2.
Is swingably supported by a hinge 12a at the lower end of the outer periphery of the casing 2, and is expanded and contracted via a link 14 and the like by an appropriate drive means 13 such as a hydraulic cylinder. In addition, this expansion / contraction operation is configured to be performed from the ground. It is desirable to prepare a plurality of types of widening blades 12 having different lengths so that they can be selected and attached in accordance with the diameter of the widened bottom portion A ′.

Next, the step of removing slime deposited on the bottoms of the excavation hole A and the expanded bottom portion A'by the slime removing device 1 will be described. After finishing the excavation work with the earth drill bucket for excavation, the slime removing device 1 attached to the lower end of the kelly bar 11 driven by the kerry bar driving device supported by the wire rope by operating the winch of the working machine Lower to the bottom.

After that, the suction pump drive motor 5 of the slime removing device 1 is driven to rotate the kelly bar 11, and the slime accumulated on the bottom of the excavation hole A is scraped to the center of the excavation hole A by the scraper 10d and the suction pipe. 3 is sucked from the suction port 3a of the suction pipe 3 by the suction pump 4 provided above the suction pipe 3, and the muddy water component is separated from the slime sucked in the separation chamber 6 connected to the discharge port of the suction pump 4. 6 is discharged from the muddy water discharge port 7 formed in the casing into the excavation hole A, and slime is formed below the separation chamber 6 from the gap 15d between the horizontal portion 15a and the horizontal portion 15c adjacent to each other in the partition wall 15. House inside. In this case, the hole wall protection plate 9 is arranged so as to have an appropriate gap with the outer peripheral surface of the casing 2 via the spacer 9a, and the muddy water discharged from the muddy water discharge port 7 is excavated through this gap. By discharging into the hole A, it is possible to prevent the muddy water discharged from the muddy water discharge port 7 from directly hitting the hole wall and collapsing the hole wall. In addition, the partition wall 15 is attached to the horizontal portion 1.
By forming 5a and 15c and the inclined portion 15b, it is possible to prevent the slime stored in the slime storage chamber 8 from flowing back into the separation chamber 6.

When the excavation hole A has a bottom expanding portion A ', the widening blade 12 arranged in the casing 2 so as to be expandable and contractible.
The slime accumulated on the bottom of the bottom of the drill hole is removed by driving the drive means 13 to scrape the slime accumulated on the bottom of the bottom of the drill hole to the center of the hole. You can

In this way, by driving the suction pump 4 and the kelly bar 11 for a required time, when the entire amount of slime accumulated on the bottoms of the excavation hole A and the bottom expansion part A'is stored in the slime chamber 8, the kelly bar is finished. 11 is pulled up to complete the slime removing step. The suction pump 4
Is driven so as to have a constant suction force, and is initially driven with a large suction force so that the suction force is gradually reduced so that fine solid components in the mud water are stored in the slime storage chamber 8. Can be housed in

7 to 10 show a slime removing device according to a second embodiment of the present invention. The slime removing device 101 is attached to the lower end of the kelly bar 11 like the slime removing device 1 of the first embodiment of the present invention.

The slime removing device 101 comprises a cylindrical casing 2, a suction pipe 3 having a suction port 3a for sucking slime accumulated at the bottom of the excavation hole at a lower end provided substantially concentrically with the cylindrical casing 2, and the suction pipe 3. A suction pump 4 having an impeller 4a provided in the upper portion, a suction pump drive motor 5 for driving the suction pump 4, a separation chamber 6 connected to a discharge port of the suction pump 4, and a casing 2 of the separation chamber 6 Muddy water discharge port 7
And a slime accommodating chamber 8 formed below the separation chamber 6 and a hole wall protection plate 9 that prevents the discharged muddy water formed on the outer periphery of the muddy water discharge port 7 from directly hitting the hole wall and collapsing the hole wall.
And a bottom cover 10 having a substantially conical shape that is openably and closably supported by the casing 2 by a hinge 10a, and slime accumulated on the bottom of the bottom of the excavation hole that is arranged to expand and contract on the outer periphery of the casing 2 at the center of the excavation hole. A widening vane 12 that is scraped up toward the portion, and a backflow prevention wall 16 that is disposed inside the slime storage chamber 8 to prevent the mud water containing slime stored in the slime storage chamber 8 from flowing back into the separation chamber 6. The slime discharge port 17 is formed in the casing 2 of the slime storage chamber 8, the fish tail 18 is provided at the center of the bottom of the bottom lid 10, and the stabilizer 19 is provided at the upper portion of the slime removing device 101.

In the present embodiment, the suction pump 4 is a general-purpose submersible sand pump. However, the suction pump 4 is not limited to this, and may be any suction pump capable of sucking slime accumulated on the bottom of the drill hole by a suction pipe. Any type of pump may be used.

Further, the drive motor 5 of the suction pump 4 can use a hydraulic motor or an electric motor. In this case, pressure oil or electricity is supplied from the ground by a hose or a cable.

The muddy water discharge port 7, 1 formed in the casing 2
7, screens 7a and 17a made of wire mesh, punching metal, lattices, etc. are arranged to separate the muddy water component from the sucked slime, and the muddy water is discharged from the muddy water discharge port 7 to the excavation hole A.
To be released inside. In this case, the screens 7a and 17a are made of a material, depending on the type of slime,
The aperture ratio, the hole diameter, etc. can be arbitrarily selected. Also,
It is desirable that the screens 7a and 17a, together with the hole wall protection plate 9, be configured so as to be easily removable from the casing 2. In addition, in order to adjust the amount of muddy water discharged from the muddy water discharge ports 7 and 17, a closing plate that temporarily blocks a part or all of the muddy water discharge ports 7 and 17 formed in the casing 2 as necessary ( (Not shown) may be provided.

The inside of the separation chamber 6 is partitioned by a partition wall 6a extending radially to smoothly guide the sucked mud-containing muddy water, and a partition wall 15 is formed between the separation chamber 6 and the slime storage chamber 8 and the partition wall 15 is separated. The opening 15f is formed so that the slime thus obtained is stored in the slime storage chamber 8.

The hole wall protection plate 9 formed on the outer periphery of the muddy water discharge ports 7 and 17 is arranged so as to have a proper gap with the outer peripheral surface of the casing 2, and muddy water is discharged into the excavation hole A through this gap. Therefore, the muddy water discharged from the muddy water discharge ports 7 and 17 is prevented from directly colliding with the hole wall, thereby preventing the hole wall from collapsing.

The bottom cover 10 having a substantially conical shape is pivotally supported by a hinge 10a, and can be closed by locking a locking tool 10b provided on the casing 2 with a pin 10e. Further, the bottom lid 10 is provided with a reinforcing rib 10c and a scraper 10d for scraping slime accumulated on the bottom of the excavation hole A toward the center of the excavation hole A.

Widening blades 12 arranged on the outer periphery of the casing 2.
Is swingably supported by a hinge 12a at the lower end of the outer periphery of the casing 2, and is expanded and contracted by an appropriate drive means 13 such as a hydraulic cylinder. In addition, this expansion / contraction operation is configured to be performed from the ground. Widening wing 1
2 prepares several kinds with different lengths and expands bottom A '
It is desirable to be able to select and attach according to the diameter of.

The step of removing slime deposited on the bottoms of the drilled hole A and the expanded bottom portion A'by the slime removing apparatus 101 of the second embodiment of the present invention is the same as that of the slime removing apparatus of the first embodiment of the present invention. However, by opening a muddy water discharge port 17 in the casing 2 of the slime storage chamber 8, a part of the muddy water is introduced from the separation chamber 6 into the slime storage chamber 8 together with the slime, and then this muddy water is discharged. The slime can be discharged smoothly into the excavation hole A through the muddy water discharge port 17 formed in the casing 2 of the above.

[0036]

Industrial Applicability According to the present invention, slime accumulated at the bottom of a drill hole can be separated completely and rapidly from muddy water, which makes it possible to treat slime including post-treatment extremely. Not only can it be done easily, but the quality of cast-in-place concrete piles can be improved.

Further, according to the second aspect of the present invention, a part of the muddy water is introduced together with the slime into the slime accommodating chamber formed below the separation chamber, and then the muddy water is discharged into the casing of the slime accommodating chamber. By discharging the slime into the drill hole, the slime can be stored more smoothly.

According to the third aspect of the present invention, the slime can be removed while preventing the mud water discharged from the mud discharge port from directly hitting the pore wall and preventing the pore wall from collapsing.

Further, according to the fourth aspect of the present invention, by expanding the widening blade, it is possible to completely and quickly remove the slime deposited on the bottom of the expanded bottom of the drill hole.

[Brief description of drawings]

1A is a view showing an inner bottom portion of a slime removing apparatus according to a first embodiment of the present invention (IV-IV sectional view of FIG. 1B), FIG.
(B) is the same front sectional view.

FIG. 2 is a side sectional view of the same.

FIG. 3 is a view showing the upper surface portion (I-I cross-sectional view of FIG. 1B).

FIG. 4A is a view showing the partition wall portion (III in FIG. 1B).
-III sectional view), (b) is a sectional view of the partition wall.

FIG. 5 is a view showing the separation chamber section (II-II cross-sectional view of FIG. 1B).

FIG. 6 is a view showing the bottom lid portion (VV cross-sectional view of FIG. 1B).

FIG. 7 is a front sectional view of a slime removing device according to a second embodiment of the present invention.

FIG. 8 is a view showing the upper surface portion (I-I cross-sectional view of FIG. 7).

FIG. 9 is a view showing the backflow prevention wall portion (II-II cross-sectional view of FIG. 7).

FIG. 10 is a view showing the bottom cover portion (III-III cross-sectional view of FIG. 7).

[Explanation of symbols]

 1 slime removal device 2 casing 3 suction pipe 4 suction pump 5 suction pump drive motor 6 separation chamber 7 mud discharge port 8 slime storage chamber 9 hole wall protective plate 10 bottom lid 11 kelly bar 12 widening blade 17 mud discharge port 101 slime removal device

Claims (4)

[Claims] 1. A suction pipe, a suction pump provided on an upper part of the suction pipe, a separation chamber connected to a discharge port of the suction pump, a muddy water discharge hole formed in a casing of the separation chamber, and a lower portion of the separation chamber. And a slime storage chamber formed in the. 2. The slime removing device according to claim 1, wherein the casing of the slime storage chamber is provided with a muddy water discharge port. 3. The slime removing device according to claim 1, wherein a hole wall protection plate is provided on the outer periphery of the muddy water discharge port. 4. The slime removing device according to claim 1, 2 or 3, wherein widening blades are arranged in a casing so as to be able to expand and contract.