JP6853519B2 - Drilling hole diameter expander - Google Patents

Description

The present invention relates to a drilling hole diameter expanding device, and more particularly to a drilling hole diameter expanding device for forming a large-diameter node in an intermediate portion of a drilling hole formed by an earth drill.

As a shape of cast-in-place concrete pile, a knotted pile (intermediate enlarged diameter pile) in which the diameter of the deepest pile head is expanded and the diameter of the intermediate portion is expanded to form a knot is known. In the middle node, the bottom surface of the node is formed in an inverted conical shape in order to prevent insufficient concrete filling due to the step of the pile wall, and the bottom surface of the node is inverted conical. Various diameter-expanding devices are used to form the concrete (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-177793

In this type of diameter-expanding device, it is common to hydraulically operate the opening and closing of the drilling blade, and as shown in FIG. 8, the diameter-expanding device 100 is supplied through one of a pair of hydraulic hoses 101 and 101. The rod 102a of the blade opening / closing cylinder 102 is extended or contracted in the vertical direction with the generated hydraulic oil, and the excavation blade 104 is formed so as to be swingable in the opening / closing direction via a link mechanism 103 connected to the tip of the rod 102a. Has been done. Therefore, in the unlikely event that the hydraulic hose 101 breaks during the diameter expansion work, hydraulic oil cannot be supplied to the blade opening / closing cylinder 102, making it impossible to close the excavation blade 104 from the open state at the node 105. Become.

Therefore, as shown in FIG. 9, when the excavation blade 104 is open, the tip of the excavation blade 104 is caught by the tapered portion 106 and the diameter expanding device 100 cannot be raised. Therefore, as shown in FIG. 10, the rod 102a can be reduced by temporarily lowering the diameter expanding device 100 and forcibly closing the excavation blade 104 against the wall surface of the vertical hole 107.

However, when the diameter expanding device 100 is raised again, the rod 102a cannot hold the contracted position because the oil pressure in the blade opening / closing cylinder 102 is lowered, and begins to expand, and once as shown in FIG. The closed excavation blade 104 reopens under its own weight. As described above, when the hydraulic hose 101 is broken during the diameter expansion work, the excavation blade 104 cannot be closed by the hydraulic operation, and there is a problem that it becomes difficult to pull up the diameter expansion device 100 from the excavation hole. It was.

Therefore, an object of the present invention is to provide a diameter-expanding device for a drilling hole that can be pulled up from the drilling hole without damaging the diameter-expanding device even if the hydraulic operation of the diameter-expanding device becomes impossible in an emergency.

In order to achieve the above object, the excavation hole diameter expanding device of the present invention is a diameter expanding device connected to the lower end of the kelly bar via an upper connecting portion, and is a support detachably connected to the lower end of the kelly bar. A body, an excavation blade whose base end is connected to the support and whose tip is swingable, an elevating member provided so as to be able to move up and down with respect to the support, and the elevating member. A link member that connects the excavation blade with the excavation blade and swings the excavation blade as the excavation member moves up and down, and a blade opening / closing cylinder that raises and lowers the excavation blade to open and close the excavation blade. The blade opening / closing cylinder has an expansion / contraction stroke for raising / lowering the elevating member between a contraction position in which the excavation blade is swung inward and an extension position in which the excavation blade is swung outward. When an external force that swings the excavation blade inward acts on the pipe that supplies the hydraulic oil to the blade opening / closing cylinder, the hydraulic oil in the blade opening / closing cylinder flows as the blade opening / closing cylinder shrinks. It is characterized in that a check valve for holding the blade opening / closing cylinder in the reduced position is provided.

Further, in the drilling hole diameter expanding device of the present invention, the check valve fills either the contraction side oil chamber or the extension side oil chamber of the blade opening / closing cylinder with hydraulic oil to form the blade opening / closing cylinder. It is characterized in that it is held in the reduced position.

Further, the drill hole diameter expanding device of the present invention is characterized in that the check valve is opened by the pilot pressure of the hydraulic oil supplied by the operation of the hydraulic control valve to extend the blade opening / closing cylinder. In addition, the check valve is provided directly at the supply / discharge port of the blade opening / closing cylinder or via a metal pipe.

According to the drilling hole diameter-expanding device of the present invention, in an emergency when the hydraulic hose breaks during the diameter-expanding work, the diameter-expanding device is temporarily lowered and the drilling blade is applied to the wall surface of the drilling hole to forcibly close it. Occasionally, the check valve regulates the flow of hydraulic oil in the blade opening / closing cylinder and holds the blade opening / closing cylinder in the reduced position, so that the diameter-expanding blade that was once closed does not open again due to its own weight, and the diameter-expanding device Can be pulled up from the drilling hole without damaging it.

Further, in the normal state of operating the hydraulic control valve to supply hydraulic oil to the blade opening / closing cylinder, the check valve is opened to allow the hydraulic oil in the blade opening / closing cylinder to flow, so that the blade opening / closing cylinder is extended and contracted. The excavation blade can be opened and closed by expanding and contracting with. Furthermore, since the check valve is provided directly to the supply / discharge port of the blade opening / closing cylinder or via a metal pipe, the check valve and the blade opening / closing cylinder will not be broken, and the diameter expansion device can be pulled up more safely. be able to.

An example of the first embodiment of the diameter-expanding device for a drilling hole of the present invention is shown, and is a front view of the diameter-expanding device showing a state in which the drilling blades are opened. FIG. 2 is a sectional view taken along line II-II of FIG. Similarly, it is a circuit diagram which shows the hydraulic circuit of the diameter expansion device. Similarly, it is explanatory drawing which shows the state which the excavation blade is open at a node part at the time of the hydraulic hose breakage of a diameter expansion device. Similarly, it is an explanatory view which shows the state which the diameter expansion device is lowered and the excavation blade is applied to the wall surface of a vertical hole, and is closed. Similarly, it is explanatory drawing which shows the state which raised the diameter expansion device from a node part with the excavation blade closed. It shows the 2nd form example of the diameter expansion device of the excavation hole of this invention, and is the circuit diagram which shows the hydraulic circuit of the diameter expansion device. It shows the diameter expansion device of the conventional excavation hole, and is explanatory drawing which shows the state in which the excavation blade is opened at the node part at the time of the hydraulic hose breakage of the diameter expansion device. Similarly, it is explanatory drawing which shows the state which the excavation blade is stuck to the wall surface of a node part when the diameter expansion device is raised. Similarly, it is an explanatory view which shows the state which the diameter expansion device is lowered and the excavation blade is applied to the wall surface of a vertical hole, and is closed. Similarly, it is explanatory drawing which shows the state which the excavation blade opened and was stuck to the wall surface of a node part when the diameter expansion device was raised.

1 to 6 show an example of the first embodiment of the drilling hole diameter expanding device in the present invention, and the diameter expanding device 11 includes a square cylinder-shaped support 12 as shown in FIGS. 1 and 2. Each of the two scraper blades 13 and the excavation blade 14 are mounted on the side surface of the support 12 so as to be openable and closable, and the blade opening / closing cylinder 15 provided inside the support 12 is provided. The support 12 is formed in a square shape in a plan view, and an upper connecting portion 16 that is detachably connected to the lower end of the keriva is provided at the upper end, and an excavation bucket or a bottom bucket is provided at the lower end. A lower connecting portion 17 is provided for detachably connecting the two.

Further, the first support shaft 18 and the second support shaft 19 are alternately provided at 90-degree intervals at four locations in the circumferential direction of the lower end portion of the support body 12. The first support shaft 18 and the second support shaft 19 are horizontally supported by a pair of first shaft support members 18a and 18a and second shaft support members 19a and 19a projecting from the outer surface of the lower end portion of the support body 12, respectively. The lower end of the scraper blade 13 is rotatably connected to the first support shaft 18, and the lower end of the excavation blade 14 is rotatably connected to the second support shaft 19. As a result, the scraper blade 13 and the excavation blade 14 are formed so that the upper side can swing inward and outward with the support shafts 18 and 19 as the center.

Further, above the first support shaft 18, a first elevating member 20 capable of elevating and lowering the support 12 in the vertical direction is provided. The first elevating member 20 is provided so as to penetrate the vertically long openings 12a and 12a provided on the opposite side surfaces of the support body 12, and both ends project from the opposite side surfaces of the support body 12. .. The rod 15a of the blade opening / closing cylinder 15 is connected to the central portion 20a of the first elevating member 20 located inside the support 12 by a pin 15b. Further, above the second support shaft 19, a second elevating member 21 capable of elevating and lowering the support 12 in the vertical direction is provided. The second elevating member 21 is framed in a square shape along the four surfaces of the support 12, and is provided above the first elevating member 20 so as to surround the support 12.

In the horizontal direction for rotatably mounting the base end portion of the first link member 22 that connects the first elevating member 20 and the scraper blade 13 to the lower portion of the protruding portion of the first elevating member 20 projecting from the opening 12a. The first link mounting pin 23 is provided, and a connecting pin 24, which is a connecting member that detachably connects the first lifting member 20 and the second lifting member 21, can be inserted in the upper portion of the protruding portion in the horizontal direction. The first insertion hole 25 is provided.

In order to rotatably attach the base end portion of the second link member 26 that connects the second elevating member 21 and the excavation blade 14 to the portion of the second elevating member 21 located above the second support shaft 19. The second link mounting pin 27 is provided in the horizontal direction, and a second insertion hole 28 corresponding to the first insertion hole 25 is provided in a portion of the second elevating member 21 located above the first elevating member 20. A pair of projecting pieces 29, 29, respectively, are provided so as to sandwich the first elevating member 20. Further, a fixing hole 30 through which the connecting pin 24 can be inserted in the horizontal direction is provided above the second link mounting pin 27, and a through hole 31 corresponding to the fixing hole 30 is provided on the outer surface of the support 12. A pair of fixed projecting pieces 32, 32 to be provided are provided in a state of sandwiching the fixing hole 30.

The scraper blade 13 is formed of a scraper blade main body 33 whose base end is connected to the first support shaft 18, and a scraper expansion blade 34 detachably attached to the tip of the scraper blade main body 33. The tip of the first link member 22 is rotatably connected to the intermediate portion of the scraper blade main body 33 via a rotation pin 35.

Similar to the scraper blade 13, the excavation blade 14 has an excavation blade body 36 whose base end is connected to the second support shaft 19, and an excavation expansion blade 37 detachably attached to the tip of the excavation blade body 36. The tip of the second link member 26 is rotatably connected to the intermediate portion of the excavation blade main body 36 via a rotation pin 38.

Further, a scraper 13a for leveling a conical surface whose diameter has been expanded in an inverted conical shape is provided on the outer surface of the scraper blade 13, and a scraper 13a for leveling the conical surface whose diameter has been expanded in an inverted conical shape is provided on the outer surface of the excavation blade 14. An excavation blade 14a is provided. The scraper 13a and the excavation blade 14a are arranged at the front edge of the scraper blade 13 and the excavation blade 14 in the rotation direction, respectively, and the excavation blade 14a is formed so as to project outward from the scraper 13a. As a result, when both the scraper blade 13 and the excavation blade 14 are opened for excavation, the excavation blade 14a excavates the earth and sand in the ground, and the scraper 13a is in a state of scraping the earth and sand (slime) generated by the excavation. ..

The blade opening / closing cylinder 15 has a first elevating member 20 and a second elevating member 21 between a reduction position in which the scraper wing 13 and the excavation wing 14 are swung inward and an extension position in which the scraper wing 13 and the excavation wing 14 are swung outward. It has an expansion / contraction stroke for raising and lowering, and as shown in the hydraulic circuit 39 of FIG. 3, one end side of the extension side hydraulic hose 40a is connected to the extension side oil chamber 15c via the metal extension side hydraulic pipe 40, and the reduction side hydraulic hose 41a. One end side of the hose is connected to the reduction side oil chamber 15d via a metal reduction side hydraulic pipe 41. Further, the other end side of the extension side hydraulic hose 40a is connected to the extension side port of the hydraulic control valve (not shown), and the other end side of the reduction side hydraulic hose 41a is connected to the reduction side port of the hydraulic control valve. In this way, the blade opening / closing cylinder 15 operates the hydraulic control valve to operate the hydraulic oil discharged from the pump (not shown) driven by the engine to extend the extension side through the extension side hydraulic hose 40a and the extension side hydraulic pipe 40. The rod 15a is extended by supplying it to the oil chamber 15c, and the rod 15a is reduced by supplying it to the reduction side oil chamber 15d through the reduction side hydraulic hose 41a and the reduction side hydraulic pipe 41.

The check valve 42 provided in the reduction side hydraulic pipe 41 regulates the outflow of hydraulic oil from the reduction side oil chamber 15d, and when the hydraulic control valve is operated to supply the hydraulic oil to the extension side oil chamber 15c. It is formed as a pilot check valve that guides the oil pressure from the pilot pipe 43 branched from the extension side hydraulic pipe 40 to open the valve and allows the hydraulic oil to flow out from the reduction side oil chamber 15d. As described above, the check valve 42 fills the contraction side oil chamber 15d with hydraulic oil to hold the rod 15a at a predetermined position when the hydraulic control valve is not operated, and the extension side oil chamber when the hydraulic control valve is operated. The hydraulic oil in the 15c and the reduction side oil chamber 15d can be simultaneously flowed to expand and contract the rod 15a between the extension position and the reduction position.

The drilling hole diameter expanding device 11 formed in this way inserts the connecting pin 24 by aligning the first insertion hole 25 of the first elevating member 20 and the second insertion hole 28 of the second elevating member 21. However, in the state where the connecting pin 24 is not inserted into the fixing hole 30 and the through hole 31, the first elevating member 20 and the second elevating member 21 are connected, and the second elevating member 21 is in a state where the second elevating member 21 can be elevated. It has become. By extending the blade opening / closing cylinder 15 in this connected state, the scraper blade 13 and the excavation blade 14 can be opened at the same time.

Here, when the extension side hydraulic hose 40a and the reduction side hydraulic hose 41a are broken during the diameter expansion work and the hydraulic operation of the diameter expansion device 11 becomes impossible, the diameter expansion device 11 is moved to the knot portion 44 of the excavation hole. The procedure for pulling up from the hose will be described with reference to FIGS. 4 to 6. First, as shown in FIG. 4, when the extension side hydraulic hose 40a and the reduction side hydraulic hose 41a of the diameter expanding device 11 are broken while the scraper blade 13 and the excavation blade 14 are left open, the hydraulic control valve is operated. However, the hydraulic oil cannot be supplied to the contraction side oil chamber 15d, and the rod 15a cannot be contracted hydraulically to close the scraper blade 13 and the excavation blade 14. Therefore, the tips of the scraper blade 13 and the excavation blade 14 cannot be caught by the tapered portion 45 to raise the diameter expanding device 11.

Next, as shown in FIG. 5, when the diameter expanding device 11 is once lowered and the scraper blade 13 and the excavation blade 14 are applied to the wall surface of the vertical hole 46 to forcibly close the blade opening / closing cylinder 15, the blade opening / closing cylinder 15 is reduced in the contracting direction. The rod 15a is reduced by receiving an external force. At this time, a negative pressure is generated in the reduction side oil chamber 15d as the rod 15a is reduced, so that a part of the hydraulic oil remaining in the reduction side hydraulic pipe 41 and the reduction side hydraulic hose 41a opens the check valve 42. A part of the hydraulic oil extruded from the extension side oil chamber 15c is discharged to the outside through the extension side hydraulic pipe 40 and the extension side hydraulic hose 40a while being sucked into the reduction side oil chamber 15d.

Subsequently, when the diameter expanding device 11 is raised again from the vertical hole 46 to the node 44, the blade opening / closing cylinder 15 receives an external force in the extension direction because the scraper blade 13 and the excavation blade 14 try to open by their own weight. Since the check valve 42 regulates the outflow of the hydraulic oil sealed in the reduction side oil chamber 15d, the rod 15a is held in the reduction position. Therefore, as shown in FIG. 6, the diameter expanding device 11 can be pulled up through the vertical hole 47 without contacting the tapered portion 45 while keeping the scraper blade 13 and the excavation blade 14 in a closed state. Further, by providing the check valve 42 directly to the supply / discharge port of the reduction side oil chamber 15d or via a metal pipe, the space between the check valve 42 and the blade opening / closing cylinder 15 is not broken, and further, the extension side hydraulic pressure is not broken. By making the pipe 40, the reduction side hydraulic pipe 41, and the pilot pipe 43, respectively, metal, the diameter expanding device 11 can be pulled up more safely without breaking the pipes 40, 41, and 43, respectively. Even if the pilot pipe 43 is broken, the flow of hydraulic oil that shrinks the rod 15a is not impaired.

FIG. 7 is a hydraulic circuit diagram of a diameter-expanding device showing a second embodiment of the present invention, and the same reference numerals are given to those showing the same components as those of the first embodiment, respectively, and detailed description thereof will be given. Is omitted.

In the hydraulic circuit 51 of this embodiment, the check valve 52 provided in the extension side hydraulic pipe 40 regulates the hydraulic oil from being sucked into the extension side oil chamber 15c, and operates the hydraulic control valve. When supplying hydraulic oil to the extension side oil chamber 15c, a pilot check is performed to send the hydraulic oil to the extension side oil chamber 15c by guiding the oil from the pilot pipe 53 branched from the extension side hydraulic pipe 40 to open the valve. It is formed as a valve. In this way, the check valve 52 regulates that the hydraulic oil is sucked into the extension side oil chamber 15c when the hydraulic control valve is not operated, and holds the rod 15a in a predetermined position, and when the hydraulic control valve is operated, the check valve 52 holds the rod 15a in a predetermined position. The hydraulic oil in the extension side oil chamber 15c and the reduction side oil chamber 15d can be simultaneously flowed to expand and contract the rod 15a between the extension position and the reduction position. Further, since the check valve 52 is provided in the extension side hydraulic pipe 40, the pilot pipe 53 can be shortened and the hydraulic circuit configuration can be simplified.

Here, if the extension side hydraulic hose 40a and the reduction side hydraulic hose 41a break during the diameter expansion work and the hydraulic operation of the diameter expansion device 11 becomes impossible, the procedure for pulling up the diameter expansion device 11 described above is performed. Similarly, when the diameter expanding device 11 is once lowered and the scraper blade 13 and the excavation blade 14 are applied to the wall surface of the vertical hole 46 to forcibly close the diameter expanding device 11, the blade opening / closing cylinder 15 receives an external force in the contraction direction and receives the rod 15a. Shrink. At this time, a part of the hydraulic oil extruded from the extension side oil chamber 15c as the rod 15a shrinks opens the check valve 52 and is discharged to the outside.

Subsequently, when the diameter expanding device 11 is raised again from the vertical hole 46 to the node 44, the blade opening / closing cylinder 15 receives an external force in the extension direction because the scraper blade 13 and the excavation blade 14 try to open by their own weight. Since the check valve 52 regulates that the hydraulic oil is sucked into the extension side oil chamber 15c, the rod 15a is held in the reduced position. Therefore, while keeping the scraper blade 13 and the excavation blade 14 in a closed state, the diameter expanding device 11 can be pulled up through the vertical hole 47 without contacting the tapered portion 45. Further, by providing the check valve 52 directly to the supply / discharge port of the extension side oil chamber 15c or via a metal pipe, the diameter between the check valve 52 and the blade opening / closing cylinder 15 is not broken, so that the diameter can be expanded more safely. The device 11 can be pulled up.

The present invention is not limited to the diameter-expanding device shown in the above-described embodiment, and can be applied to a diameter-expanding device having various structures. It can also be applied to a conventionally used expansion bucket. In this case, even if the flood control blade cannot be operated hydraulically with the bottom expansion blade open at the bottom of the excavation hole, the bottom expansion blade can be forcibly held in the closed position, so that the bottom expansion bucket can be pulled up from the excavation hole. it can.

11 ... Diameter expander, 12 ... Support, 12a ... Opening, 13 ... Scraper blade, 13a ... Scraper, 14 ... Excavation blade, 14a ... Excavation blade, 15 ... Blade opening / closing cylinder, 15a ... Rod, 15b ... Pin, 15c ... extension side oil chamber, 15d ... reduction side oil chamber, 16 ... upper connecting portion, 17 ... lower connecting portion, 18 ... first support shaft, 18a ... first shaft support member, 19 ... second support shaft, 19a ... second 2-axis support member, 20 ... 1st elevating member, 20a ... central part, 21 ... 2nd elevating member, 22 ... 1st link member, 23 ... 1st link mounting pin, 24 ... connecting pin, 25 ... 1st insertion hole , 26 ... 2nd link member, 27 ... 2nd link mounting pin, 28 ... 2nd insertion hole, 29 ... projecting piece, 30 ... fixing hole, 31 ... through hole, 32 ... fixed projecting piece, 33 ... scraper wing body, 34 ... Scraper expansion wing, 35 ... Rotating pin, 36 ... Excavating wing body, 37 ... Excavation expansion wing, 38 ... Rotating pin, 39 ... Hydraulic circuit, 40 ... Extension side hydraulic piping, 40a ... Extension side hydraulic hose, 41 ... Reduction side hydraulic piping, 41a ... Reduction side hydraulic hose, 42 ... Check valve, 43 ... Pilot piping, 44 ... Nodal part, 45 ... Tapered part, 46, 47 ... Vertical hole, 51 ... Hydraulic circuit, 52 ... Check valve, 53 … Pilot piping

Claims (5)

A diameter-expanding device that is connected to the lower end of the kelly bar via an upper connecting portion, and a support that is detachably connected to the lower end of the kelly bar, and a base end portion that is connected to the support and the tip portion swings. The excavation blades formed so as to be movable, the elevating member provided so as to be able to move up and down with respect to the support, the elevating member and the excavation wing are connected, and the elevating member moves as the elevating member moves up and down. A link member for swinging the excavation blade and a blade opening / closing cylinder for opening / closing the excavation blade by raising / lowering the elevating member are provided, and the blade opening / closing cylinder is a reduction in which the excavation blade is swung inward. The excavation blade is installed in a pipe that has an expansion / contraction stroke for raising and lowering the elevating member between a position and an extension position in which the excavation blade is swung outward and supplies hydraulic oil to the blade opening / closing cylinder. When an external force that swings in the direction acts, the hydraulic oil in the blade opening / closing cylinder flows as the blade opening / closing cylinder shrinks, and a check valve that holds the blade opening / closing cylinder in the reduced position is provided. A drilling hole diameter expanding device characterized by being provided. The drilling hole diameter expanding device according to claim 1, wherein the check valve encloses hydraulic oil in a contraction-side oil chamber of the blade opening / closing cylinder to hold the blade opening / closing cylinder in the contracted position. .. The drilling hole diameter expanding device according to claim 1, wherein the check valve is provided with hydraulic oil sealed in an oil chamber on the extension side of the blade opening / closing cylinder to hold the blade opening / closing cylinder in the reduced position. .. The excavation according to any one of claims 1 to 3, wherein the check valve is opened by a pilot pressure of hydraulic oil supplied by operating a hydraulic control valve to extend the blade opening / closing cylinder. Hole diameter expansion device. The drilling hole diameter expanding device according to any one of claims 1 to 4, wherein the check valve is provided directly at the supply / discharge port of the blade opening / closing cylinder or via a metal pipe.

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