Expanding the device

Abstract

To provide a bottom enlarging and forming device capable of forming a high quality vertical hole, by removing sediment of a bottom corner part of the vertical hole.SOLUTION: A bottom enlarging and forming device 1 has: a connection part 2 connected to a bottom part of a bottom enlarging and excavating device 10; a rotation drive unit 3 provided at an axial position of a vertical hole of the connection part 2; a support arm part 4 extending in a radial direction of the vertical hole and rotated by the rotation drive unit 3; and a scraping part 5 provided to the support arm part 4 and scraping a bottom corner part of the vertical hole. The bottom enlarging and forming device 1 is connected to the bottom enlarging and excavating device 10 after finishing bottom enlargement and scrapes the bottom corner part of the vertical hole by the scraping part 5, and can drop sediment accumulated at the bottom corner part independent from the rotation of the bottom enlarging and excavating device 10 to a sediment accumulating hole at the center of the bottom part of the vertical hole.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a bottom expansion device that creates an expanded bottom of a vertical hole into which a pile is to be erected. [Background technology]

[0002] By using a bottom-expanding excavation device to expand the bottom of the vertical hole into which the pile will be installed at an angle of approximately 12 degrees, the amount of concrete at the bottom of the vertical hole can be increased when concrete is poured, thereby strengthening the bearing capacity of the pile installed in the vertical hole. The inventor proposed such a bottom-expanding excavation device for expanding the bottom of a vertical hole in Patent Document 1.

[0003] The bottom-expanding excavation device described in Patent Document 1 uses a gripper unit having a gripper cylinder to press against the inner peripheral surface of a casing buried underground, and a drilling arm unit having a radially extending drilling cylinder excavates the peripheral wall surface of a vertical hole by rotating the casing. The drilling arm unit of this bottom-expanding excavation device has a brush unit attached to a drilling bit that protrudes from the tip of the drilling cylinder. The brush unit comes into contact with the bottom corners of the vertical hole and scrapes out the excavated soil, making it possible to remove the excavated soil from the bottom corners of the vertical hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-183501 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the bottom-expanding drilling device described in Patent Document 1, the brush section is attached to the drilling bit, and when the drilling bit drills, it rotates together with the drilling bit and constantly slides against the bottom corner of the vertical hole, which is thought to have some impact on the brush section.

[0006] Furthermore, scraping out soil using the brush unit requires the rotation of the excavation arm, which in turn requires the rotation of the casing. If the ground is soft, the rotation of the casing may cause the surrounding wall of the vertical hole on the outside of the casing to collapse, causing it to fall and accumulate at the bottom corner. If this happens, even if the soil has been scraped out by the brush unit, soil will accumulate at the bottom corner again.

[0007] If the soil at the bottom angle of the vertical hole is scraped out and dropped into a soil collection hole in the center of the bottom of the vertical hole, and a flat bottom corner can be formed, a high-quality vertical hole can be created.

[0008] Therefore, the present invention aims to provide a bottom expansion device that can create high-quality vertical holes by removing soil and sand from the bottom corners of the vertical hole. [Means for solving the problem]

[0009] The bottom expansion device of the present invention is characterized by comprising a connecting portion that is connected to the bottom of the bottom expansion excavation device, a rotary drive portion that is provided at the axial position of the vertical hole of the connecting portion, a support arm portion that extends radially of the vertical hole and rotates by the rotary drive portion, and a scraping portion that is provided on the support arm portion and scrapes the bottom corner portion of the vertical hole.

[0010] The bottom expansion device of the present invention is connected to the bottom of the bottom expansion excavation device via a connecting part, and a rotary drive unit is provided at the axis of the vertical hole on the connecting part. Furthermore, a support arm unit extending radially of the vertical hole and rotated by the rotary drive unit is provided with a scraper unit for scraping the bottom corner of the vertical hole. Therefore, there is no need to connect the bottom expansion device of the present invention to the bottom expansion excavation device when expanding the bottom of the vertical hole. After the bottom expansion is completed, the device is connected to the bottom expansion excavation device and the scraper unit scrapes the bottom corner of the vertical hole. By doing so, the sediment accumulated at the bottom corner can be dropped into a sediment pit at the center of the bottom of the vertical hole, independent of the rotation of the bottom expansion excavation device. Furthermore, the rotary drive unit provided at the axis of the vertical hole can rotate the scraper unit provided on the support arm unit without rotating the casing. Therefore, the sediment accumulated at the bottom corner can be dropped into a sediment pit at the center of the bottom of the vertical hole without affecting the bottom corner of the vertical hole, such as by collapsing the peripheral wall surface of the vertical hole. This allows the bottom corners to be leveled flat.

[0011] The support arm portion may include a piston rod provided with the scraping portion, and a cylinder that moves the piston rod back and forth in a radial direction. The piston rod provided with the scraping portion moves radially back and forth from the cylinder, and by adjusting the position of the scraping portion in the radial direction, it is possible to scrape out soil and sand from the bottom corners of vertical holes, even if the diameters of the vertical holes are different.

[0012] The piston rod may be provided with a stopper portion that stops the movement of the scraper portion due to the advancement of the piston rod at a position corresponding to the radius of the vertical hole. By providing the stopper portion, the movement of the scraper portion due to the advancement of the piston rod can be stopped at a position corresponding to the radius of the vertical hole.

[0013] The stopper portion can include an adjustment bar that moves radially together with the piston rod, protrusions that can be attached to the adjustment bar at predetermined intervals, and a stop portion that contacts the protrusions as the adjustment bar moves radially to prevent movement. When the adjustment bar moves radially together with the piston rod, the protrusions contact the stop portion to prevent movement. Therefore, by providing the positions of the protrusions on the adjustment bar that can be attached at predetermined intervals according to the diameter of the vertical hole, the scraping portion can be stopped at an appropriate position according to the diameter of the vertical hole.

[0014] The rotary drive unit may be formed by a hydraulic motor, and the support arm unit may be formed by a hydraulic actuator and connected to a hydraulic circuit that radially extends and retracts the drilling cylinder of the drilling arm unit from the bottom-expanding drilling device, and may include a sequence valve that supplies oil to the hydraulic actuator up to a predetermined pressure at which the protrusion is prevented from moving to the stop portion and switches the oil line to the hydraulic motor when the predetermined pressure is exceeded. With this configuration, oil is supplied to the hydraulic actuator by the sequence valve up to the predetermined pressure at which the protrusion is prevented from moving to the stop portion, thereby extending the piston rod of the hydraulic actuator. Then, when the protrusion is prevented from moving to the stop portion and the oil pressure exceeds the predetermined pressure, the sequence valve switches the oil line to the hydraulic motor, causing the hydraulic motor to start rotating. Therefore, the scraper can be moved to a predetermined position and rotated without needing to lay a new oil hose from the ground. [Effects of the Invention]

[0015] The bottom expansion device of the present invention can drop the sediment accumulated in the bottom corners into a sediment pit in the center of the bottom of the vertical hole, independently of the rotation of the bottom expansion excavation device and without rotating the casing, and can level the bottom corners. Therefore, the bottom expansion device of the present invention can create a high-quality vertical hole by removing the sediment from the bottom corners of the vertical hole. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 10 is a diagram showing the state of excavation of a vertical hole using a bottom-expanding excavation device. [Figure 2] This is a diagram showing a bottom expansion device attached to a bottom expansion excavation device, and is a diagram for explaining the bottom expansion device related to an embodiment of the present invention. [Figure 3] FIG. 3 is a plan view of the bottom expansion device shown in FIG. 2, illustrating the support arms extending radially of the vertical hole. [Figure 4] FIG. 2 is a diagram showing the configuration of a scraping hydraulic circuit. [Figure 5] 10A to 10C are diagrams for explaining the operation of the scraping hydraulic circuit. DETAILED DESCRIPTION OF THE INVENTION

[0017] A bottom expanding device according to an embodiment of the present invention will be described with reference to the drawings. The bottom expansion device of this embodiment is a vertical hole V into which a casing C is pressed, as shown in Figure 1, and is an attachment attached to the bottom of a bottom expansion excavation device 10 that expands the diameter of the bottom B0 of the vertical hole V into which piles will be installed. The bottom expansion excavation device 10 is suspended from a crane C1 and placed at the bottom of the vertical hole.

[0018] This bottom-expanding excavation device 10 comprises, for example, a hanging section 20 for hanging it from a crane vehicle C1, a gripper section 30 for fixing the bottom-expanding excavation device 10 in a state where its axis is aligned with the axis position of the casing C, and an excavation arm section 40 for excavating the peripheral wall surface of the vertical hole by rotating the casing. The excavation arm section 40 has a protruding excavation bit 42 formed at the tip of an excavation cylinder 41 that extends and retracts in response to commands from an operation panel OP. In this way, a conventional bottom expanding excavation device 10 can be used.

[0019] As shown in Figures 2 and 3, the bottom expansion construction device 1, which is connected to the bottom of the bottom expansion excavation device 10 after the bottom expansion work is completed, comprises a connecting section 2, a rotational drive section 3, a support arm section 4, a scraping section 5, and a stopper section 6. The connecting part 2 is connected to the bottom of the bottom-expanding excavation device 10 and secures the bottom-expanding construction device 1 to the bottom-expanding excavation device 10. The connecting part 2 is secured to the bottom of the bottom-expanding excavation device 10 by screwing a connecting plate 21 to the bottom of the bottom-expanding excavation device 10 with fixing screws 22.

[0020] The rotary drive unit 3 is provided at the axial position of the vertical hole in the connecting unit 2. The rotary drive unit 3 includes a hydraulic motor 31 that serves as a drive source for rotating the support arm unit 4, a reducer 32 connected to the rotation shaft of the hydraulic motor 31, a frame unit 33 that supports the hydraulic motor 31 and the reducer 32, and a rotary joint 34.

[0021] The rotary shaft of the hydraulic motor 31 is rotated by hydraulic pressure from the bottom-expanding drilling device 10. The reducer 32 reduces the rotation speed of the hydraulic motor 31. The frame portion 33 comprises a foundation support portion 33a hanging down from the connecting portion 2, a mounting plate 33b connected to the lower end of the foundation support portion 33a, and an extension support portion 33c hanging down from the mounting plate 33b and supporting the rotary joint 34. The rotary joint 34 functions as a fluid coupling that can maintain an open oil passage even when the rotary shaft of the hydraulic motor 31 rotates.

[0022] The support arm 4 is connected to the rotary drive unit 3 and rotated by the rotary drive unit 3 while extending radially of the vertical hole. The support arm 4 is formed by a hydraulic actuator 4x equipped with a piston rod 4a provided with a scraper 5 and a cylinder 4b that moves the piston rod 4a radially. The support arm 4 is connected to the rotary drive unit 3 by a circular swivel plate 4c.

[0023] In the cylinder 4b of the hydraulic actuator 4x, an oil passage from the rotary joint 34 is connected to a pair of ports for moving the piston rod 4a back and forth. A scraper 5 is connected to the tip of the piston rod 4a.

[0024] In order to accommodate vertical holes with a diameter of, for example, 1600 mm at the minimum to 3000 mm at the maximum, the hydraulic actuator 4x is designed so that the maximum length when the piston rod 4a advances is 1500 mm at the outermost position of the scraping portion 5, and the minimum length when the piston rod 4a retreats is 800 mm at the outermost position of the scraping portion 5.

[0025] The scraping unit 5 includes a scraping plate 51 for scraping the bottom corner of the vertical hole, an adjustment unit 52 for adjusting the inclination angle of the scraping plate 51 relative to the direction of rotation, and a connecting device 53 for connecting to the support arm unit 4.

[0026] The scraper 51 is a flat squeegee that functions as a scraper. The scraper 51 is made of a highly durable rubber plate, and in this embodiment, it is made of, for example, a conveyor belt in which a fibrous material is sandwiched between a pair of rubber belts.

[0027] The adjustment portion 52 is a plate-like member having an arc-shaped adjustment hole 52a formed therein that bulges toward the peripheral wall surface of the vertical hole. One of the two points of the upper end of the adjustment portion 52 is rotatably connected to the scraper plate 51, and the other point is screwed to a position where the angle of the adjustment hole 52a is adjusted. The connector 53 screws the adjustment part 52 to the support arm part 4 .

[0028] The stopper portion 6 stops the movement of the scraping portion 5 caused by the advancement of the piston rod 4a at a position corresponding to the radius of the vertical hole. The stopper portion 6 includes an adjustment bar 61 that moves radially together with the piston rod 4a, protrusions 62 that can be attached to the adjustment bar 61 at predetermined intervals, and stopping portions 63 that come into contact with the protrusions 62 as the adjustment bar 61 moves radially outward to prevent movement.

[0029] The adjustment bar 61 is formed of a rod-shaped body, and its tip is connected to the adjustment part 52 of the scraping part 5. The adjustment bar 61 has installation holes 61a formed at predetermined intervals for installing the protrusions 62. In this embodiment, 15 installation holes 61a are formed every 100 mm to accommodate vertical holes with a diameter of the expanded bottom part ranging from 3000 mm to 1600 mm. The protrusions 62 can be inserted into the installation holes 61a and installed as screws that protrude from the outer circumferential surface of the adjustment bar 61. The stop part 63 is a bracket connected to the side of the cylinder 4b and through which the adjustment bar 61 is inserted.

[0030] The rotary drive unit 3 and the support arm unit 4 are controlled by a scraping hydraulic circuit 7 shown in FIG. The scraping hydraulic circuit 7 shown in Figure 4 is a hydraulic hose piped from the operation panel OP shown in Figure 1 to the bottom-widening excavation device 10, and is connected by disconnecting the hydraulic hose connected to the hydraulic circuit for radially extending and retracting the excavation cylinder 41 in the excavation arm section 40. The scraping hydraulic circuit 7 includes a first coupler 71a and a second coupler 71b for connection to hydraulic hoses.

[0031] A hydraulic hose 72a from the first coupler 71a is connected to a sequence valve 73 and a first port p1 of the hydraulic actuator 4x. A hydraulic hose 72b from the sequence valve 73 is connected to the hydraulic motor 31. A hydraulic hose 72c from the second coupler 71b is connected via a check valve 74 to the hydraulic motor 31 and a second port p2 of the hydraulic actuator 4x.

[0032] The sequence valve 73 is in a blocked state up to a predetermined pressure according to the pressure setting, and is in a communicating state when the predetermined pressure is exceeded.

[0033] The operation and usage of the bottom expanding device 1 according to the embodiment of the present invention configured as above will be described with reference to the drawings. As shown in Figure 1, after the bottom of the vertical hole is expanded using the bottom expansion excavation device 10, the crane C1 is operated to lift the bottom expansion excavation device 10, and the bottom expansion construction device 1 is attached by connecting the connecting part 2 of the bottom expansion excavation device 1 shown in Figure 2 to the bottom of the bottom expansion excavation device 10. Additionally, the hydraulic hose to the excavation arm section 40 is reconnected to the scraping hydraulic circuit 7. Additionally, a protrusion 62 is set in one of the installation holes 61a of the adjustment bar 61 according to the diameter of the bottom of the vertical hole.

[0034] Then, the crane C1 is operated to lower the bottom expanding device 1 to the bottom of the vertical hole, and oil is sent to the scraping hydraulic circuit 7 shown in Figure 5(A). In the scraping hydraulic circuit 7, when oil is sent from the first coupler 71a, the oil is sent to the hydraulic actuator 4x because the sequence valve 73 is in a shutoff state until the predetermined pressure is reached. When oil is sent to the first port p1 of the cylinder 4b of the hydraulic actuator 4x, the piston rod 4a advances from the cylinder 4b. The advance of the piston rod 4a moves the scraper 5 in the radially outward direction.

[0035] 2 and 3, as scraper 5 moves in the radially outward direction, adjustment bar 61 is pulled by scraper 5 and moves in the radially outward direction. As adjustment bar 61 moves, protrusion 62 approaches stopper 63. When scraper 5 reaches the radius of the vertical hole, protrusion 62 comes into contact with stopper 63, preventing scraper 5 from moving beyond the radius of the vertical hole.

[0036] Despite the oil being sent to the cylinder 4b, the piston rod 4a is prevented from advancing, and the pressure on the sequence valve 73 shown in Figure 5(B) increases. When the pressure exceeds a predetermined pressure, the sequence valve 73 enters a communicating state and switches the oil path to the hydraulic motor 31. This causes the hydraulic motor 31 to start rotating. As the hydraulic motor 31 rotates, the support arm portion 4 begins to rotate via the rotary joint 34 . By rotating the support arm part 4, the scraper plate 51 of the scraper part 5 scrapes the bottom corners of the vertical hole, and the soil can be dropped into a soil storage hole in the center of the bottom of the vertical hole.

[0037] In this way, the bottom expansion device 1 is not connected when expanding the diameter of the bottom of the vertical hole, but is connected to the bottom expansion excavation device 10 (see Figure 1) after the bottom expansion is completed and the scraping unit 5 is used to scrape the bottom corners of the vertical hole, so that it is not used when expanding the bottom of the bottom expansion excavation device 10.The bottom expansion device 1 can then drop the soil accumulated at the bottom corners into a soil pit in the center of the bottom of the vertical hole independently of the rotation of the bottom expansion excavation device.This prevents the scraping unit 5 from being affected.

[0038] Furthermore, even without rotating the casing, the rotary drive unit 3, which is located at the axis of the vertical hole, can rotate the scraper unit 5, which is located on the support arm unit 4. Therefore, the soil accumulated at the bottom corner of the vertical hole can be dropped into the soil collection hole in the center of the bottom of the vertical hole without affecting the bottom corner of the vertical hole, such as collapsing the peripheral wall surface of the vertical hole. This allows the bottom corner to be leveled.

[0039] Therefore, the bottom expansion device 1 can create a high-quality vertical hole by removing soil and sand from the bottom corners of the vertical hole.

[0040] In addition, the piston rod 4a provided with the scraping portion 5 moves radially back and forth from the cylinder 4b, adjusting the position of the scraping portion 5 in the radial direction, so that soil and sand can be scraped out from the bottom corners of vertical holes even if the diameters of the vertical holes are different.

[0041] The stopper portion 6 stops the movement of the scraper portion 5 due to the advancement of the piston rod 4a at a position corresponding to the radius of the vertical hole, so that the scraper portion 5 can be prevented from moving beyond the radius of the vertical hole, and the scraper portion 5 can be stopped at an appropriate position.

[0042] When the adjustment bar 61 moves radially outward together with the piston rod 4a, the protrusions 62 come into contact with the stoppers 63, preventing the movement. Therefore, by providing the positions of the protrusions 62 on the attachable adjustment bar 61 at predetermined intervals according to the diameter of the vertical hole, the scraping part 5 can be stopped at an appropriate position according to the diameter of the vertical hole.

[0043] When the work is completed, as shown in Figure 5 (C), oil is supplied from the second coupler 71b to the second port p2 of the cylinder 4b, causing the piston rod 4a to be accommodated in the cylinder 4b, and the hydraulic actuator 4x contracts, pulling in the scraper plate 51, making it possible to lift up the bottom expansion creation device 1 shown in Figure 2.

[0044] In this way, the hydraulic hoses from the control panel shown in Fig. 1 to the bottom expansion device 1 shown in Fig. 2 can be two hoses connected to the first coupler 71a and the second coupler 71b shown in Fig. 5. Therefore, by using the hydraulic hoses connected to the hydraulic circuit for radially extending and contracting the excavation cylinder 41 in the excavation arm section 40 as they are, control can be achieved without piping a new oil hose from the ground. [Industrial Applicability]

[0045] The present invention is suitable for construction work to create an enlarged bottom portion of a vertical hole into which a pile will be installed. [Explanation of symbols]

[0046] 10. Bottom expansion drilling equipment 20 Hanging part 30 Gripper section 40 Excavation arm 41 Drilling cylinder 42 Drilling Bit 1 Bottom expansion device 2 Connecting part 3 Rotation drive unit 31 Hydraulic motor 32 Reducer 33 Frame section 33a Foundation support section 33b Mounting plate 33c Extension post section 34 Rotary joint 4 Support arm 4x hydraulic actuators p1 First port p2 Second port 4a Piston rod 4b Cylinder 4c Swivel Plate 5 Scraping section 51 Scraping board 52 Adjustment part 52a adjustment hole 53 Connector 6 Stopper part 61 Adjustment bar 61a Installation hole 62 Protrusion 63 Stop part 7. Hydraulic circuit for scraping 71a 1st Coupler 71b 2nd Coupler 72a~72c Hydraulic hose 73 Sequence valve C casing V vertical hole B0 bottom C1 Crane Truck OP operation panel

Claims

1. a connecting portion connected to the bottom of the bottom expanding excavation device; a rotation drive unit provided at the axial position of the vertical hole of the connecting portion; a support arm portion extending in a radial direction of the vertical hole and rotated by the rotation drive portion; A bottom expansion device provided on the support arm portion and equipped with a scraping portion that scrapes the bottom corner portion of the vertical hole.

2. The bottom expanding device according to claim 1, wherein the support arm portion comprises a piston rod provided with the scraping portion and a cylinder for moving the piston rod back and forth in the radial direction.

3. 3. The bottom expansion device according to claim 2, further comprising a stopper portion that stops the movement of the scraping portion due to the advancement of the piston rod at a position corresponding to the radius of the vertical hole.

4. The stopper portion comprises an adjustment bar that moves radially together with the piston rod, a protrusion that can be attached to the adjustment bar at predetermined intervals, and a stopping portion that contacts the protrusion when the adjustment bar moves radially outward to prevent movement.

5. The rotary drive unit is formed by a hydraulic motor, The support arm portion is formed by a hydraulic actuator, The bottom expansion construction device described in claim 4 is equipped with a sequence valve connected to a hydraulic circuit that radially expands and contracts the excavation cylinder of the excavation arm section from the bottom expansion excavation device, and supplies oil to the hydraulic actuator up to a predetermined pressure when the protrusion section is prevented from moving to the stopping section, and switches the oil path to the hydraulic motor when the predetermined pressure is exceeded.

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