Slime treatment apparatus

Abstract

To improve the accuracy and efficiency of slime treatment and to simplify a device.SOLUTION: The slime treatment device 2 includes a stirring device 3 for stirring the slime and an underwater sand pump 4 for sucking the slime. The stirring device 3 is connected to a kelly-bar KB which is suspended from a supporting device and can be rotationally driven, a hydraulic pressure cylinder 10 which is connected to the lower end of the kelly-bar KB through a main shaft 10A and is extended downward, and the piston rod side of the hydraulic pressure cylinder 10. The device comprises a slider 12 slidably mounted on the outer periphery of a hydraulic cylinder 10, a driven member 13 provided under the slider 12 and moving integrally with the slider 12, a pair of agitating members 14, 15 each having one end pivotally supported on the lower end of the hydraulic cylinder 10, and open-leg rods 18, 19 each having one end pivotally supported on the driven member 13 and the other end pivotally supported on each of the agitating members 14, 15. The dimension of the stirring members 14 and 15 when they are opened is made to almost coincide with the diameter of the bottom part 20.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a slime treatment device used to remove slime that has accumulated at the bottom of a pile hole, particularly in the expanded bottom portion having an inner diameter larger than the inner diameter of the pile hole shaft, when constructing a cast-in-place pile in the excavated pile hole. [Background technology]

[0002] When constructing cast-in-place piles, it is necessary to dispose of the slime (excavation debris, fine sand and silt powder with a specific gravity of approximately 1.5 to 2.2) generated by excavation before pouring concrete. For this reason, a conventional method for removing slime that has accumulated in the enlarged bottom of a pile hole involves positioning a submersible slime suction pump at the enlarged bottom of the pile hole, spraying water from a submersible water injection pump through the water nozzles of a water injection member to lift up the slime that has accumulated in the enlarged bottom of the pile hole, and then discharging the slime sucked up by the submersible slime suction pump together with the water to the ground via a vertical support member. A scraper is used to prevent the slime lifted up by the water sprayed from the water nozzles of the water injection member from moving sideways. Then, a support mechanism such as construction machinery that supports the above-ground part of the vertical support member moves (revolves) the vertical support member along the outer periphery of the shaft of the pile hole, and rotates (spins) the vertical support member so that the slime suction submersible pump is positioned on the outer periphery of the expanded shaft of the pile hole, thereby removing slime that has settled over the entire surface of the expanded shaft of the pile hole (see Patent Document 1). Also known is a slime treatment device that includes a discharge pipe that transports the sediment taken in from the suction port upward, a stirring rod that rotates by the driving force of an air motor to stir the sediment, a compressor unit that supplies compressed air to the air motor via an air supply pipe, an exhaust pipe that is connected at one end to the air motor and at the other end to the discharge pipe, and a skirt unit that surrounds the rotation range of the stirring rod and the suction port; the device rotates along the outer periphery of the expanded bottom of the pile hole to discharge slime that has settled at the bottom of the hole (see Patent Document 2). [Patent Document 1] Patent Publication No. 2021-127598 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-90038 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0003] However, in such slime treatment devices, the device is placed at the bottom of the pile hole and moved along the outer periphery of the pile hole or toward the center to treat the slime. This poses the problem that the slime treatment work takes a long time. In addition, there is a risk that the slime will settle again at the bottom of the hole after the slime treatment while rotating along the outer periphery of the expanded bottom of the pile hole, which causes a problem of lack of reliability.

[0004] The present invention has been made to solve the above-mentioned problems, and aims to provide a slime processing device that can perform slime processing efficiently and reliably with a simple configuration. [Means for solving the problem]

[0005] The slime treatment device of claim 1 of the present invention is a slime treatment device that agitates slime deposited at the bottom of a pile hole and treats it by sucking it up with an underwater sand pump, and is equipped with an agitation means that is suspended from a support device and connected to a rotating shaft that can be driven to rotate, and that operates a pair of foldable agitation members to open and close freely, and the dimensions of these agitation members are set to dimensions that correspond to the diameter of the bottom of the pile when they are spread apart, and the agitation means spreads the agitation members and rotates them when they reach the bottom of the pile.

[0006] The slime treatment device according to claim 1 of the present invention is a slime treatment device that agitates slime deposited at the bottom of a pile hole and treats it by sucking it up with an underwater sand pump. The device is equipped with a stirring means that operates a pair of foldable stirring members connected to a rotating shaft that is suspended from a support device and rotatably driven, and that opens and closes the stirring members. The dimensions of the stirring members are set to correspond to the diameter of the bottom of the pile when they are spread apart. The stirring means spreads and rotates the stirring members when they reach the bottom of the pile. When treating the slime, the rotating shaft suspended from the support device is lowered to approximately the center of the pile hole, and when the folded stirring members reach near the bottom of the pile hole, the stirring means spreads the folded pair of stirring members above the bottom of the pile hole. When the rotating shaft is rotated, both stirring members rotate over the entire bottom of the pile hole, stirring the slime near the bottom, and the stirred slime is sucked up with an underwater sand pump.

[0007] The slime treatment device of claim 2 of the present invention is a slime treatment device that agitates slime deposited at the bottom of a pile hole using an agitator and then sucks it up using an underwater sand pump for treatment.The agitator comprises a rotatable kelly bar suspended from a support device, a cylinder device connected to the lower end of the kelly bar via a main shaft and extended downward, a slider connected to the piston rod side of the cylinder device and attached so as to be able to slide freely on the outer periphery of the cylinder device, a pair of agitating members each having one end pivoted to the lower end of the cylinder device, and a leg-spreading rod having one end on the slider side and the other end pivoted to each agitating member, and is characterized in that the dimensions of the agitating members when spread are configured to approximately match the diameter of the bottom of the pile.

[0008] In a slime treatment device according to claim 2 of the present invention, slime deposited at the bottom of a pile hole is agitated by an agitator and then sucked up by an underwater sand pump for treatment. The agitator includes a rotatable kelly bar suspended from a support device, a cylinder device connected to the lower end of the kelly bar via a main shaft and extending downward, a slider connected to the piston rod side of the cylinder device and slidably attached to the outer periphery of the cylinder device, a pair of agitating members each having one end pivotally supported at the lower end of the cylinder device, and a leg-spreading rod having one end on the slider side and the other end pivotally supported on each agitating member, the dimensions of the agitating members when spread are configured to approximately match the diameter of the bottom of the pile. Therefore, when treating slime, the rotatable kelly bar suspended from the support device is lowered to approximately the center of the pile hole, and when the agitating members reach the vicinity of the bottom of the pile hole in a folded state, the cylinder device is operated. When the cylinder device is operated, the slider and the driven member are pushed down, and the leg-spreading rod pushes the agitating members apart, spreading them apart. When the kelly bar is rotated, both stirring members rotate over the entire bottom of the pile hole, stirring the slime near the bottom, and the stirred slime is then sucked up by the underwater sand pump.

[0009] Furthermore, in the slime processing apparatus according to claim 3 of the present invention, it is preferable to provide a brush below the agitator. With this configuration, the brush can capture relatively large powder particles. Furthermore, in the slime processing apparatus according to claim 4 of the present invention, it is preferable that the pile has an expanded bottom. With this configuration, even if the diameter of the expanded bottom is large, the agitator can be reliably rotated over the entire bottom surface. Furthermore, in the slime processing apparatus according to claim 5 of the present invention, it is preferable that the agitator has a stabilizer connected to the Kelly bar side via a Kelly box. With this configuration, vibrations can be prevented and the agitator can be rotated stably. Furthermore, in the slime processing apparatus according to claim 6 of the present invention, it is preferable that the underwater sand pump has multiple suction ports in multiple directions. With this configuration, the agitated slime can be more reliably sucked up. [Effects of the Invention]

[0010] The slime treatment device of claim 1 of the present invention is a slime treatment device that agitates slime deposited at the bottom of a pile hole and treats it by sucking it up with an underwater sand pump, and is equipped with an agitation means that is suspended from a support device and connected to a rotating shaft that can be driven to rotate, and that operates a pair of foldable agitation members to open and close freely, and the dimensions of these agitation members are set to dimensions that correspond to the diameter of the bottom of the pile when they are spread apart, and the agitation means spreads and rotates the agitation members when they reach the bottom of the pile, so that the entire bottom can be agitated evenly and reliably, improving the accuracy of slime treatment and simplifying the configuration to reduce costs, as well as improving the efficiency of slime treatment.

[0011] In addition, the slime treatment device according to claim 2 of the present invention is a slime treatment device that uses an agitator to agitate slime deposited at the bottom of a pile hole and then sucks it up with an underwater sand pump for treatment. The agitator comprises a rotatable kelly bar suspended from a support device, a cylinder device connected to the lower end of the kelly bar via a main shaft and extending downward, a slider connected to the piston rod side of the cylinder device and slidably attached to the outer periphery of the cylinder device, a pair of agitating members each having one end pivoted to the lower end of the cylinder device, and a leg-spreading rod having one end on the slider side and the other end pivoted to each agitating member. By configuring the dimensions of the agitating members when spread apart to approximately match the diameter of the bottom of the pile, the agitating members can agitate the entire bottom surface evenly and reliably, improving the accuracy of slime treatment and simplifying the configuration to reduce costs, as well as improving the efficiency of slime treatment. [Brief explanation of the drawings]

[0012] [Figure 1] Figures 1(A) to 1(I) are explanatory diagrams showing the steps of constructing a bell-bottom pile in order. [Figure 2] FIG. 2 is a front view showing the agitation device of the slime processing device according to one embodiment of the present invention, showing a state in which the agitation member is folded. [Figure 3]FIG. 3 is a front view of the stirring device of FIG. 2, showing the stirring members in an open state. [Figure 4] 4 is a plan view showing the stabilizer of the stirring device of FIG. 2. FIG. [Figure 5] Figures 5 (A) and (B) are explanatory diagrams showing part of the configuration of the underwater sand pump of the slime treatment device according to the above embodiment, and are scale parts attached to the upper end of the casing to identify the circumferential position of the pile hole. [Figure 6] (A) to (C) in Figure 6 are explanatory diagrams showing the top surface of the pile hole and the cross section of the pile hole side, with some parts omitted. (A) is an explanatory diagram showing the state where the submersible sand pump is hung downward from the center of the pile hole, (B) is an explanatory diagram showing the state where the submersible sand pump is moved circumferentially along the inner surface of the pile hole shaft, and (C) is an explanatory section showing the state where the circumferential position of the submersible sand pump is confirmed through the scale section. [Figure 7] FIG. 7 is an explanatory diagram showing the state in which, after stirring, the water jet pump of the submersible sand pump of FIG. 6 is lowered from the center of the pile hole and moved circumferentially along the inner circumferential surface of the pile hole shaft. [Figure 8] FIG. 8 is an explanatory diagram showing an agitation device of a slime processing apparatus according to a modified example of the above embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be described below with reference to an embodiment shown in the drawings. Figures 1A to 1I are explanatory diagrams sequentially illustrating the steps for constructing a bottom-expanding pile. Figures 2 and 3 are front views of an agitation device for a slime treatment device according to one embodiment of the present invention, with Figure 2 showing the agitation member folded and Figure 3 showing the agitation member unfolded. First, the bottom-expanding pile PL is constructed according to the following steps. After setting the hole core (see Figure 1A), a drilling bucket is connected to the kelly bar KB (see Figure 1B), and the surface layer is excavated (see Figure 1C). Next, the surface casing 30 (see Figure 5) is erected (see Figure 1D), a stabilizing solution is injected, the shaft is excavated, and the supporting layer is confirmed (see Figures 1E and 1F). Next, a bottom-expanding bucket is attached and the bottom is excavated (see Figure 1G), after which settling is allowed to occur and the bottom is dredged (see Figure 1H). Next, a primary bottom hole treatment is carried out to replace the muddy water (see (I) in FIG. 1). The slime treatment device 2 according to this embodiment is used during this bottom hole treatment.

[0014] As shown in Figures 2 and 3, the slime treatment device 2 of this embodiment is composed of an agitation device (agitation means) 3 connected to a kelly bar (rotating shaft) KB and rotating integrally therewith, and a submersible sand pump 4 that sucks up the slime. The kelly bar KB is suspended from a support device (not shown) and is rotatably driven. The submersible sand pump 4 is attached to the lower end of a vertical support member (not shown) and can be suspended down into the pile hole PL. The submersible sand pump 4 is connected to a discharge pipe (not shown). The submersible sand pump 4 is suspended down into the pile hole PL, sucks up slime, and discharges it to the ground through the discharge pipe. The submersible sand pump 4 has multiple suction ports 6 provided in multiple directions via L-shaped suction hoses 5.

[0015] The agitator 3 is configured to include a hydraulic cylinder (cylinder device) 10 that is connected to the lower end of the kelly bar KB via a connector 11 and a main shaft 10A and extends downward, a slider 12 that is connected to the piston rod side of the hydraulic cylinder 10 and is slidably attached to the outer periphery of the hydraulic cylinder 10, a driven member 13 that is provided below the slider 12 and moves up and down integrally with the slider 12, a pair of agitators 14 and 15 each having one end pivotally supported on the lower end of the hydraulic cylinder 10, and leg-spreading rods 18 and 19 that have one end pivotally supported on the driven member 13 and the other end pivotally supported on each agitator 14 and 15 via pivot portions 16A, 16B, 17A, and 17B, respectively. The agitators 14 and 15 are designed to be foldably spread apart in response to the vertical movement of the slider 12 and the driven member 13. In other words, it has the same mechanism as an umbrella, and the slider 12 slides on the outer periphery of the main shaft 10A to function as a potter's wheel. These stirring members 14, 15 may be made of pipes or plates. Wire brushes 23 are provided at a predetermined interval below the undersides of the stirring members 14, 15. The longitudinal dimension of each stirring member 14, 15 is set slightly shorter than the radius of the enlarged-diameter bottom portion 20. When the hydraulic cylinder 10 is set at the center of the pile hole by a kelly bar KB support device (not shown), the longitudinal dimension of each stirring member 14, 15 approximately matches the radius of the enlarged-diameter bottom portion 20 when opened. In this embodiment, the diameter of the enlarged-diameter bottom portion 20 is set to a large diameter of 6000 mm, but this is not limited to this and may be smaller or larger. The longitudinal dimension of the stirring members 14, 15 is determined so as to ensure sufficient space to avoid interference with the hole wall. Furthermore, the stirring member may be configured to slide freely in the longitudinal direction so as to be extendable and slidable, making the longitudinal dimension variable.

[0016] The agitator 3 is provided with a stabilizer 21 between the main shaft 10A and the Kelly box (connector) 11 to prevent vibration. The stabilizer 21 is fitted into and connected to the square box-shaped Kelly box 11. Furthermore, the arm of the stabilizer 21 is designed to slide freely and retractably. A camera is also attached to the agitator 3 so that the state of slime processing can be confirmed after the agitator 3 is recovered. Component numbers 22 and 23 are hydraulic nipples for connecting hydraulic hoses.

[0017] As shown in Figures 5(A) and 5(B), the submersible sand pump 4 is provided with a scale 31 attached to the upper end of the casing 30 to determine the circumferential position of the pile hole PL. When the submersible sand pump 4 is lowered close to the expansion bottom part 20 by the rod pipe 32, the scale 31 is moved circumferentially along the inner circumferential surface of the shaft part of the pile hole PL. The scale 31 determines the circumferential position of the suction port 6 of the suction hose 5. Therefore, the suction port 6 can be positioned reliably and evenly in the circumferential direction of the expansion bottom part 20 to suck in slime. Figures 6(A) to 6(C) are explanatory diagrams showing the top surface of the pile hole PL and a cross-sectional side view of the pile hole PL, respectively, with some parts omitted. Figure 6(A) is an explanatory diagram showing the state in which the submersible sand pump 4 is lowered downward from the center of the pile hole PL after the agitation is completed and the agitator 3 is raised. Figure 6(B) is an explanatory diagram showing the state in which the submersible sand pump 4 is moved circumferentially along the inner surface of the shaft of the pile hole PL. Figure 6(C) is an explanatory diagram showing the state in which the circumferential position of the submersible sand pump is checked through the scale. The submersible sand pump 4 is operated simultaneously with the agitator 3, but it may also be operated after the agitator 3 is raised. Figure 7 shows the submersible sand pump 4 of Figure 6, with the water jet pump 33 suspended downward from the center of the pile hole after agitation and spraying water from the outer periphery of the expansion bottom 20 toward the center. The circumferential position of the water jet pump 33 can also be checked through the scale 31.

[0018] Next, the operation of the slime processing device 2 according to the embodiment will be described. In the slime processing device 2 according to this embodiment, when an expanded diameter bottom portion 20 is formed in the pile hole PL (see (I) in FIG. 1), the agitator 3 with the agitating members 14 and 15 folded is connected to the kelly bar KB on the ground and positioned near the expanded diameter bottom portion 20 of the pile hole PL together with the kelly bar KB by a support device (not shown). At this time, the submersible sand pump 4 is also suspended into the pile hole PL by a vertical support member (not shown) (see FIG. 3). Once the agitator 3 is positioned near the expanded diameter bottom portion 20, the hydraulic cylinder 10 is operated, and the slider 12 is pushed downward, causing the leg-spreading rods 18 and 19 to push and open the agitating members 14 and 15. Then, when the kelly bar KB is rotated, the agitating members 14 and 15 agitate the slime that has settled and accumulated at the expanded diameter bottom portion 20. The relatively small and lightweight slime that is stirred up by the agitation is sucked and discharged through the suction port 6 of the submersible sand pump 4. The heavy slime, which is made up of relatively large powder particles that are blown up by the agitation, is captured and collected by the wire brush 23. The rotation speed of the agitating members 14, 15 is determined based on the optimum rotation speed obtained through experiments depending on the type of soil. Moreover, since the agitating members 14, 15 are approximately matched to the diameter of the expanded diameter bottom portion 20, the agitating members 14, 15 can rotate over the entire bottom surface, allowing the entire bottom portion 20 to be agitated evenly and reliably. This improves the accuracy and efficiency of slime treatment. In addition, the configuration can be simplified, leading to cost reductions.

[0019] In the slime processing device 2 according to the above embodiment, the hydraulic cylinder 10 is connected to the kelly bar KB via the connector 11. However, this is not limited to this. As shown in FIG. 5, a rectangular cylindrical support member 101 may be attached to the kelly bar KB via the connector 11, and hydraulic cylinders 110 and 111 may be attached to the leg-spreading rods 118 and 119, respectively. Operating these hydraulic cylinders 110 and 111 may cause the agitators 114 and 115 to fold and spread. In addition, in the slime processing device 2 according to the above embodiment, the brush is a wire brush, but this is not limited to this. Brushes made of other materials that are more likely to capture large slime may also be used. Furthermore, while the pile PL is configured with an expanded bottom 20, this is not limited to this. Needless to say, piles with a base having the same diameter as the shaft are also applicable. Furthermore, in the slime processing device 2 according to the above embodiment, the submersible sand pump 4 has multiple suction ports 6 arranged in multiple directions. However, this is not limited to this; a single suction port may also be used. [Explanation of symbols]

[0020] 2 Slime processing equipment 3. Stirring device 4. Submersible Sand Pump KB Kellyba 10 Hydraulic cylinder (cylinder device) 12 Sliders 14, 15 Stirring member 18, 19 Leg-spreading rod 20 Expanded diameter bottom (pile bottom)

Claims

1. A slime treatment device that stirs slime deposited at the bottom of a pile hole and sucks it up with an underwater sand pump, A slime processing device characterized in that it is equipped with an agitation means that is suspended from a support device and connected to a rotatable rotating shaft, and that operates a pair of foldable agitation members to open and close freely, the dimensions of the agitation members being set to dimensions corresponding to the diameter of the base of the pile when they are spread apart, and the agitation means spreads the agitation members and rotates them when they reach the base of the pile.

2. A slime treatment device that stirs the slime deposited at the bottom of a pile hole with an agitator and sucks it up with an underwater sand pump, The agitation device comprises a rotatable kelly bar suspended from a support device, a cylinder device connected to the lower end of the kelly bar via a main shaft and extending downward, a slider connected to the piston rod side of the cylinder device and slidably attached to the outer periphery of the cylinder device, a pair of agitation members each having one end pivoted to the lower end of the cylinder device, and a leg-spreading rod having one end on the slider side and the other end pivoted to each agitation member, and the dimensions of the agitation members when spread are configured to approximately match the diameter of the bottom of the pile.

3. 3. The slime treatment device according to claim 2, wherein a brush is provided below the stirring member.

4. A slime processing device according to claim 2 or 3, characterized in that the pile has an enlarged bottom portion.

5. 4. The slime processing device according to claim 2, wherein the agitator has a stabilizer connected to the Kelly bar side via a Kelly box.

6. 3. A slime treatment device according to claim 2, wherein the underwater sand pump has a plurality of suction ports provided in multiple directions.

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