JP6632087B2 - Hole expanding device - Google Patents

Description

  The present invention relates to a hole expanding device that expands a part of a drilled hole.

  The blade provided at the tip of the rod is extended outward using a link mechanism, and the hole wall of the drill hole is cut by the blade to form an enlarged diameter portion on the hole wall on the bottom side of the drill hole. There is a hole device (see Patent Document 1).

JP 2001-20650 A

  However, since the blade portion is only supported by a rotating shaft that allows the blade portion to swing, when the hard hole wall of concrete or the like is cut, the blade portion vibrates (causes chatter) or the blade portion may be vibrated. There was a possibility of deformation, and there was room for improvement.

  The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a hole expanding device that suppresses vibration of a blade portion and improves durability.

The hole expanding device according to claim 1, wherein the supporting portion is inserted into the drilling hole and supported at the bottom of the drilling hole, and is rotatably supported by the supporting portion and is accommodated inside the supporting portion. A blade portion movable between a storage position and a projecting position protruding outside the support portion; and a blade portion attached to a rotatable drilling rod, movable in the axial direction of the support portion and integrally rotating with the support portion. A driving unit, which is swingably connected to the driving unit and the blade unit, and presses the drilling rod inserted into the drilling hole in a state in which the support unit is supported by the bottom unit. A link member that relatively moves the support portion and moves the blade portion from the accommodation position to the protruding position, and the support portion is provided to face the blade portion, and the blade portion at the protruding position is A support wall that receives the reaction force from the borehole Has the support portion, said has the blade portion is provided with a pair as the blade portion protrudes on both sides, the cutting edge of the blade portion, the protruding position from the accommodated position swings upward from below The support wall is provided on both sides of the blade portion, and is mounted on the bottom of the excavation hole at the tip of the support portion, and rotatably supports the support portion rotatably. A table is provided .

  The hole expanding device according to the first aspect is used, for example, by being attached to the tip of a drilling rod. As an example of a method of use, a hole expanding device attached to the tip of a drilling rod is inserted into a drilled hole that has been drilled in advance, and a support portion is supported at the bottom of the drilled hole.

  Here, when the drive unit is rotated around the axis, the support unit rotates integrally with the drive unit. In the state where the support portion is rotating, the drive portion is moved in the axial direction of the support portion, that is, when the drive portion is pushed to the bottom side, the blade portion swingably supported by the support portion by the link member is moved from the storage position. It moves to the protruding position, hits the bottom hole wall of the drilling hole, and forms an enlarged diameter portion on the bottom hole wall.

  At this time, the blade portion receives a reaction force from the hole wall of the excavation hole, and the reaction force can be supported by a support wall provided facing the blade portion. Thereby, vibration of the blade portion at the time of hole diameter expansion can be suppressed, and deformation or breakage of the blade portion can be suppressed even with a hard hole wall.

In the hole diameter expanding device according to the first aspect, by performing cutting with two blades, work efficiency is improved as compared with the case of performing cutting with one blade.

In the hole expanding device according to claim 1 , when the support portion is pulled out from the excavation hole, the blade portion is expanded in diameter as compared with a mechanism in which the cutting edge swings from above to below and moves from the storage position to the protruding position. It is easy to be stored in the storage position without being caught by the part.

In the hole diameter expanding device according to the first aspect, by supporting both surfaces of the blade portion, vibration and deformation of the blade portion can be reduced as compared with a case where only one surface of the blade portion is supported.

In the hole expanding device according to claim 1 , even when the support portion rotates, the turntable provided at the bottom of the drill hole does not rotate, so that the bottom of the drill hole is not cut, and The depth does not change.

The invention according to claim 2, in hole diameter apparatus according to claim 1, wherein the support portion is cylindrical covering the outer periphery of the support portion is attached to said tubular body, said blade section A window portion through which the window enters and exits is formed.

In the hole expanding device according to the second aspect , since the outer peripheral portion of the support portion is covered with the cylindrical body, it is difficult for cutting chips to enter the inside of the support portion. Further, since the blade portion protrudes outward through the window portion, the blade portion is allowed to move from the storage position to the protruding position, and it is difficult for cutting chips to enter from the window portion.

  As described above, according to the hole expanding device of the present invention, there is an excellent effect that the durability of the blade portion can be improved.

It is a side view showing the hole expanding device concerning one embodiment of the present invention. (A) is a front view which shows the hole diameter expansion apparatus which removed the cylindrical member, the upper cover, and the lower cover. It is a side view which shows the hole expansion apparatus which removed the cylindrical member, the upper cover, and the lower cover. 4A is a longitudinal sectional view of the hole expanding device as viewed from the side, and FIG. 4B is a sectional view taken along line 4 (B) -4 (B) of the hole expanding device shown in FIG. 4 (C) is a sectional view taken along line 4 (C) -4 (C) of the hole expanding device shown in FIG. 4 (A), and FIG. 4 (D) is a hole expanding device shown in FIG. 4 (A). FIG. 4B is a cross-sectional view of the apparatus taken along line 4 (D) -4 (D), and FIG. 4E is a cross-sectional view taken along line 4 (E) -4 (E) of the hole expanding apparatus shown in FIG. FIG. 4F is a sectional view taken along line 4 (F) -4 (F) of the hole diameter increasing device shown in FIG. It is the longitudinal cross-sectional view seen from the side surface side of the hole diameter expansion device. It is the front view of the longitudinal section seen from the side of a hole expanding device. (A) is a sectional view showing a state in which a hole is drilled in a brick wall and a concrete foundation using a drill, and (B) is a part in which a part of the hole is expanded by inserting a hole expanding device into the hole. It is sectional drawing which shows a mode that it is diameter. (A) is a sectional view showing a brick wall and a concrete foundation after removing a hole expanding device, (B) is a side view showing a tip portion of a PC steel rod to be inserted along a hole, and (C) ) Is a cross-sectional view showing a brick wall and a concrete foundation showing a state where a PC steel rod is inserted into the hole and the grout material is injected, and (D) is a hole after the PC steel rod is inserted and the grout material is injected. 3 is a cross-sectional view showing the vicinity of the tip of FIG.

A hole diameter expanding device 10 according to one embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a hole expanding device 10 includes a driving unit 16 attached to a tip of a tubular drilling rod 14 of a core machine 12 (not shown in FIG. 1, see FIG. 7B). The drive unit 16 is provided on the side opposite to the excavation rod side, and has a support unit 18 that cannot rotate relative to the drive unit 16 and is relatively movable in the axial direction.

(Configuration of drive unit)
As shown in FIGS. 1 and 2, the driving unit 16 includes a cylindrical member 20 formed of a metal material such as steel, stainless steel, and the like. A male screw 24 screwed to the female screw 22 is formed. The outer diameter of the cylindrical member 20 is formed smaller than the inner diameter of the excavation hole 28 drilled by the drill 15 of the core machine 12 shown in FIG.

  As shown in FIG. 2 to FIG. 5, a link support member 30 formed of a metal material such as steel or stainless steel is disposed in an intermediate portion in the axial direction inside the cylindrical member 20. The link support member 30 includes a large-diameter portion 32 and a small-diameter portion 36 in this order from the top, and a stepped hole 38 penetrating in the axial direction is formed at the center. The link support member 30 is fixed to the cylindrical member 20 using a set screw 40.

  As shown in FIGS. 4A and 4C, a pair of flat portions 42 are formed in the small diameter portion 36 of the link support member 30 so as to be parallel to each other. A female screw 44 is formed on the flat portion 42. The axis of the female screw 44 is orthogonal to the axis of the link support member 30.

  As shown in FIG. 4C, a first link support shaft 46 is attached to the female screw 44. The first link support shaft 46 includes a head portion 46A, a link support shaft portion 46B, and a male screw 46C screwed to the female screw 44.

  The link support shaft portion 46B is rotatably inserted into a hole 50A on one end side of the link 48, and the link 48 can swing about the first link support shaft 46 (the direction of arrow A in FIG. 4A). ).

  As shown in FIGS. 1, 2, and 4, at the lower end of the cylindrical member 20, a cylindrical upper cover 51 made of a metal material such as steel or stainless steel and having the same outer diameter as the outer diameter of the cylindrical member 20 is provided. Are attached with screws (not shown). At the lower end of the upper cover 51, an elongated rectangular notch 51A for protruding a blade portion 62 described later is formed.

(Configuration of support section)
The support section 18 is arranged below the drive section 16. The support section 18 includes a main body 18A and a cylindrical lower cover 18B arranged on the outer peripheral side of the main body 18A. The main body 18A includes a blade supporting portion 18Aa and a cylindrical portion 18Ab integrally formed above the blade supporting portion 18Aa. As shown in FIGS. 4 and 5, the cylindrical portion 18Ab is slidably inserted into the cylindrical member 20 from below the cylindrical member 20 of the driving section 16. The lower cover 18B is fixed to the blade supporting portion 18Aa of the main body 18A with screws 19.

  As shown in FIGS. 2 and 4, a first key groove 52 extending in the axial direction is formed on the outer peripheral surface of the cylindrical portion 18Ab, and the first key groove 52 is formed on the inner peripheral surface of the cylindrical member 20 of the drive unit 16 in the axial direction. A second keyway 54 extending along the first keyway 52 is formed, and a key 56 is fixed to the first keyway 52 of the support portion 18 with a screw 58. The key 56 is slidably inserted into the second key groove 54 of the cylindrical member 20. Thus, the drive unit 16 and the support unit 18 cannot rotate relative to each other, and can move relative to each other in the axial direction.

  As shown in FIGS. 1, 2, and 4, the lower end of the support portion 18 is formed of a metal material such as steel or stainless steel, and has a cylindrical shape having the same outer diameter as the outer diameter of the upper cover 51. The lower cover 18B is attached. In the lower cover 18B, an elongated rectangular window portion 53 for projecting a blade portion 62 described later is formed.

  As shown in FIGS. 4A and 5, the lower cover 18 </ b> B has a part on the upper side inserted so as to be relatively movable from the lower end side of the upper cover 51, and a part on the upper part of the upper cover 51 and the lower cover 18 </ b> B. And a part of the lower side overlaps in the axial direction.

(Structure of blade part and drive mechanism of blade part)
As shown in FIG. 2 and FIG. 4 (E), a pair of grooves 60 extending parallel to each other along the axial direction is provided on the blade supporting portion 18Aa of the supporting portion 18 with the axis of the supporting portion 18 interposed therebetween. It is formed on both sides. A blade portion 62 formed of a metal plate of steel, stainless steel, or the like, which is formed in a substantially fan shape and described below, is slidably inserted into the groove 60. The groove wall of the groove 60 corresponds to the support wall of the present invention.

  As shown in FIGS. 4A, 5, and 6, the blade portion 62 includes a first side 62 </ b> A and a second side 62 </ b> B extending linearly, and a curved portion 62 </ b> C, and the first side 62 </ b> A. A hole 64 is formed near an intersection between the first side 62A and the second side 62B, and a female screw 66 is formed near an intersection between the first side 62A and the curved portion 62C.

  The support wall 68 provided between the one groove 60 and the other groove 60 of the support portion 18 has a pair of holes 72 into which the shaft portions 70A of the pins 70 for swingably supporting the blade portions 62 are inserted. Have been. The head 70B is formed on the pin 70 at one end of the shaft 70A. On the other hand, a counterbore 72A into which the head 70B of the pin 70 is inserted is formed at one end side of the hole 72 in the support portion 18, and the head 70B of the pin 70 projects from the support wall 68 and the blade 62 The head 70B is fitted into the spot facing 72A so as not to hit the head.

  As shown in FIG. 4 (E), the shaft portion 70A of the pin 70 inserted into the hole 72 penetrates the hole 64 of the blade portion 62, and a retaining ring is provided on the tip side of the shaft portion 70A penetrating the blade portion 62. 74 are fitted. Thus, the pin 70 is fixed to the support 18. As shown in FIGS. 4A and 6, the blade portion 62 is supported so as to be swingable in the direction of arrow B about the pin 70. When the blade 62 swings, the side surfaces of the blade 62 slide on the groove wall surfaces on both sides of the groove 60.

  As shown in FIGS. 4 and 5, a second link support shaft 76 is attached to the female screw 66 of the blade 62. The second link support shaft 76 includes a head portion 76A, a link support shaft portion 76B, and a male screw 76C screwed to the female screw 66. The link support shaft portion 76B of the second link support shaft 76 is rotatably inserted into the hole 50B at the other end of the link 48. As a result, the link 48 and the blade 62 can swing about the second link support shaft 76.

  A blade 63 made of a diamond sintered body having excellent wear resistance is fixed to the second side 62B of the blade portion 62.

  As shown in FIGS. 4 and 5, the support portion 18 has a coil spring 78 disposed inside the cylindrical portion 18Ab. The coil spring 78 urges the support section 18 and the drive section 16 in a direction separating from each other. Further, a bolt 79 for holding the coil spring 78 on the axis is attached to the support portion 18. FIG. 4A shows a cross section of the hole expanding device 10 in a normal state (initial state), and the coil spring 78 is expanded. When the drive unit 16 approaches the support unit 18, the coil spring 78 is compressed as shown in FIG.

  As shown in FIG. 4A, when the hole expanding device 10 is in a normal state, the blade portion 62 is housed inside the support portion 18, and as shown in FIG. When approaching, the second link support shaft 76 of the blade portion 62 is pushed by the link 48 and swings, and the second side 62B of the blade portion 62 to which the blade 63 is fixed is formed by the notch 51A of the upper cover 51 and the lower side. It protrudes radially outward of the support portion 18 through a window 53 (see FIGS. 2C and 2D) of the cover 18B. The width of the notch 51A and the width of the window 53 are slightly larger than the width (thickness) of the blade 62.

(Illustration stand)
As shown in FIG. 4, a turntable 80 is rotatably attached to the lower end side of the support portion 18. The turntable 80 has a shaft member 82 and a support leg 84 attached to the lower end surface of the support portion 18, a ball bearing 86 that rotatably connects the shaft member 82 and the support leg 84, and the support leg 84 does not come off from the shaft member 82. And a washer 90. The shaft member 82 is fixed to an end surface of the support portion 18 with a bolt 90.

(Action, effect)
Next, a step of expanding a hole using the hole expanding apparatus 10 of the present embodiment will be described with reference to FIGS. Here, the seismic reinforcement of the brick wall will be described.

(1) As shown in FIG. 7A, the drilling hole 28 is formed in the brick wall 94 and the underground concrete foundation 96 with the drill 15 of the core machine 12. During and after drilling of the excavation hole 28, cutting chips inside the excavation hole 28 are removed using a dust collector or the like.

(2) The drill 15 is pulled out from the excavation hole 28, the drill 15 is removed from the drilling rod 14 of the core machine 12, and the hole expanding device 10 is attached to the tip of the drilling rod 14. The hole expanding device 10 is inserted deep into the excavation hole 28 until it hits the bottom of the hole 28.

(3) Thereafter, the drilling rod 14 is gradually moved toward the depth of the excavation hole 28 while rotating the drilling rod 14. With the movement of the excavation rod 14, the drive unit 16 moves to the support unit 18 side, and accordingly, the link 48 presses the second link support shaft 76 of the blade unit 62, and FIG. 6 and FIG. As shown in (1), the blade portion 62 swings out of the support portion 18 and protrudes, the blade 63 cuts the inner peripheral surface of the excavation hole 28, and a part of the excavation hole 28 is enlarged in diameter. As a result, as shown in FIG. 8A, an enlarged diameter portion 28A is formed near the bottom of the excavation hole 28. Here, in the hole diameter expanding device 10, only a portion above the turntable 80 rotates while the turntable 80 is held in contact with the bottom of the excavation hole 28. Further, while cutting the inner peripheral surface of the excavation hole 28, cutting chips in the excavation hole 28 are removed by a suction device (not shown) using a dust collector or the like.

(4) Next, as shown in FIG. 8B, a male screw 98A is machined at the tip of the PC steel rod 98, and a flat washer-shaped supporting plate 102 is attached to the male screw with a nut 100, and the PC steel The rod 98 is inserted into the excavation hole 28, and the tip is abutted against the bottom of the excavation hole 28.

(5) Thereafter, the grout 104 is poured into the inside of the excavation hole 28 to solidify the grout 104 (see FIGS. 8C and 8D). It can be reinforced with a steel bar 98. Since the solidified grout agent 104 partially expands in diameter and enters the inside of the enlarged diameter portion 28A, when a force in the pulling direction acts on the PC steel rod 98, the diameter of the expanded grout agent 104 is increased. Since the (portion that has entered the enlarged diameter portion 28A) is caught by the enlarged diameter portion 28A of the excavation hole 28, the structure is stronger against the force in the pull-out direction than when there is no enlarged diameter portion 28A.

  In the hole diameter expanding device 10 of the present embodiment, when the diameter of the excavation hole 28 is expanded, the protruding blade portion 62 receives a reaction force from the hole wall of the excavation hole 28, and this reaction force faces the blade portion 62. Since the blade portion 62 is supported so as to be sandwiched from both sides by the groove wall of the groove 60 serving as a support wall provided, vibration (chatter) of the blade portion 62 can be suppressed. Moreover, even if it is a hard hole wall, deformation and breakage of the blade portion 62 can be suppressed, and the durability of the blade portion 62 can be improved.

  In the hole diameter expanding device 10 of the present embodiment, since the excavation hole 28 is cut by the two blade portions 62, the work efficiency can be improved as compared with the case of cutting by the single blade portion 62.

  In the hole expanding device 10 of the present embodiment, the hole expanding device 10 is moved from the excavation hole 28 in comparison with a mechanism in which the cutting edge of the blade portion 62 swings from above to below and moves from the storage position to the protruding position. When the blade is pulled out, the blade portion 62 does not catch on the enlarged diameter portion 28A and is easily stored in the storage position.

  In the hole diameter expanding device 10 of the present embodiment, since the turntable 80 does not rotate when the side wall of the excavation hole 28 is being cut, the bottom of the excavation hole 28 is not cut. Does not change in depth.

  In the hole expanding device 10 of the present embodiment, since the support portion 18 is covered with the lower cover 18B (however, the window portion 53 as a window portion formed to have a minimum size into and out of which the blade portion 62 enters and exits). Except for this, cutting chips are less likely to enter the inside of the support portion 18. In the state where the blade portion 62 is housed inside the support portion 18, substantially the entire window 53 is closed by the second side 62B of the blade portion 62, as shown in FIGS. Since it comes off, it is difficult for cutting chips to enter from the window 53.

  Further, the hole expanding device 10 can supply air to the inside of the hole expanding device 10 through the drilling rod 14. The supplied air is sent to the inside of the support portion 18 through the hole 38 and blows out from the window 53 of the lower cover 18B. This facilitates suction of cuttings near the bottom of the excavation hole 28.

[Other embodiments]
As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the gist of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 Hole expansion device 16 Drive part 18 Support part 18B Lower cover (tubular body)
48 Link member
53 window 60 groove (the groove wall of the groove is a support wall)
62 blade section 80 turntable

Claims (2)

A support portion inserted into the borehole and supported at the bottom of the borehole,
A blade portion rotatably supported by the support portion, a blade portion movable between a housing position housed inside the support portion, and a protruding position protruding outside the support portion,
A drive unit attached to a rotatable drilling rod, movable in the axial direction of the support unit, and integrally rotating with the support unit;
The drive unit and the support unit are swingably connected to the drive unit and the blade unit, and the drive unit and the support unit are relatively moved by pressing the drilling rod inserted into the drill hole while the support unit is supported by the bottom. A link member for moving the blade portion from the storage position to the protruding position ;
A support wall provided on the support portion so as to face the blade portion, and receiving the reaction force that the blade portion at the projecting position receives from the hole wall of the excavation hole;
Has,
The supporting portion is provided with a pair of the blade portions so that the blade portion protrudes to both sides,
The cutting edge of the blade portion swings upward from below and moves from the storage position to the projecting position,
The support wall is provided on both sides of the blade portion,
At the tip of the support, a turntable that is mounted on the bottom of the borehole and rotatably supports the support is provided.
Hole expanding device. A cylindrical body that covers an outer peripheral portion of the support portion is attached to the support portion,
The hole expanding device according to claim 1 , wherein a window portion through which the blade portion enters and exits is formed in the cylindrical body.