JP2018155007A - Device for widening diameter of drilling hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for widening a diameter of a drilling hole capable of suppressing runout of the center during diameter expanding work and easily changing work contents.SOLUTION: A device for widening a diameter of a drilling hole according to the present invention comprises: a tubular support body connected to a lower end of a kelly-bar; first and second support spindles disposed in a peripheral direction of an outer surface of the lower portion of the support body; scraper blades which are connected to the first support spindle and of which upper portion sides are swingable; drilling blades which are connected to the second support spindle and of which upper portion sides are swingable; first and second lifting members capable of lifting in a vertical direction of the support body; a first link member for swinging the scraping blades according to the lifting movement of the first lifting member; a second link member for swinging the drilling blades according to the lifting movement of the second lifting member; a cylinder for opening and closing the blades so as to lift the first lifting member; and a connecting member for detachably connecting the first and second lifting members. The plurality of scraper blades and the plurality of drilling blades are alternately arranged at equal intervals in the circumferential direction about the support body, and also drilling cutting edges which are attached onto outer surfaces of the drilling blades, protrude outward from outer surfaces of the scraping blades.SELECTED DRAWING: Figure 1

Description

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

  As a shape of a cast-in-place concrete pile, there is known a knotted pile (intermediate diameter expanded pile) in which a deepest pile head is expanded and a middle portion is expanded to form a node. In order to prevent the filling of the concrete from being insufficient due to the level difference of the pile wall, the middle node is formed in a reverse cone shape on the bottom surface of the node, and the bottom surface of the node is formed in a reverse cone shape. In order to form it, various diameter expansion apparatuses are used (for example, refer patent document 1).

JP 2014-177793 A

  However, since the conventional diameter expansion device uses two diameter expansion blades formed so that the upper side can be swung, the core may become unstable due to contact with one piece during diameter expansion work. It was. In addition, when removing the slime after the diameter expansion, the scraper member is bolted so as to cover the excavating blade of the diameter expansion blade, so it takes a lot of work to change the work between the diameter expansion and the slime removal. It was.

  Accordingly, an object of the present invention is to provide an apparatus for expanding a drilling hole, which can suppress the runout during the diameter expansion work and can easily change the work contents between the diameter expansion work and the slime removal work. .

  In order to achieve the above object, a diameter expansion device for an excavation hole according to the present invention is a diameter expansion device connected to a lower end of a kelly bar through an upper connecting portion, and is a cylinder that is detachably connected to the lower end of the kelly bar. Shaped support, horizontal first and second support shafts provided in the circumferential direction of the outer surface of the lower end of the support, and the upper end of the support can be swung with the lower end connected to the first support shaft. A scraper blade formed on the upper surface of the support shaft, a drilling blade having a lower end connected to the second support shaft so that the upper side is swingable, and a vertically movable support body provided above the first support shaft. A first elevating member formed, a second elevating member provided so as to be movable up and down above the second support shaft, and the first elevating member and the scraper blade. A first link member that swings the scraper blade as the elevating member moves up and down; and the second elevating unit And the excavating blade, and a second link member that swings the excavating blade as the second lifting member moves up and down, a blade opening / closing cylinder that lifts and lowers the first lifting member, and the first lifting and lowering member. A connecting member that detachably connects the member and the second elevating member, and a plurality of the scraper blades and a plurality of the excavating blades are provided alternately at equal intervals in the circumferential direction around the support body. The excavating blade provided on the outer surface of the excavating blade is protruded outward from the outer surface of the scraper blade.

  Furthermore, the diameter expansion device of the excavation hole of this invention is provided with the lower connection part in the lower end part of the said support body, and the connection member which connects the said 1st raising / lowering member and the said 2nd raising / lowering member so that attachment or detachment is possible. And a connecting member for detachably connecting the second elevating member elevating / lowering regulating member and the second elevating / lowering member provided on the upper side surface of the support body, and the scraper blade And the excavating blade is connected to the first support shaft or the second support shaft, and can be attached to and detached from the blade main body to which the first link member or the second link member is connected, and the tip of the blade main body. It is characterized by the fact that it is formed with an expansion wing to be attached. In addition, the scraper blade and the excavating blade are provided with a scraping plate that projects obliquely inward from the side surface in the traveling direction, and the inner side of the inner surface of the scraper blade and the excavating blade is It is characterized in that a projecting triangular projecting portion having a triangular cross section is provided.

  According to the drilling hole diameter increasing apparatus of the present invention, during the diameter expanding operation, the first lifting member and the second lifting member are lowered by the blade opening / closing cylinder to open the plurality of scraper blades and the plurality of drilling blades. Since it is in the state, the occurrence of core runout can be suppressed, and the diameter expansion operation can be performed in a stable state. Further, when slime removal is performed after the diameter expanding operation, the connection between the first elevating member and the second elevating member is released, and only the first elevating member is lowered by the blade opening / closing cylinder, whereby a plurality of scraper blades Therefore, it is possible to easily change between the diameter expanding operation in which the scraper blade and the excavating blade are opened and the slime removing operation in which only the scraper blade is opened.

  Furthermore, by connecting the bottoming bucket to the lower connecting part provided at the lower end of the support body, core runout can be prevented more reliably, and the excavated earth and sand can be dropped into the bottoming bucket, and the diameter expansion excavation In addition, the earth and sand can be discharged efficiently. Further, by using the same connecting pin for connecting the first lifting member and the second lifting member and for connecting the second lifting member lifting restriction member and the second lifting member, the diameter expansion work is performed by inserting and removing the connecting pin. And the slime removal work can be changed more easily. In addition, by forming the scraper blade and the excavation blade with the blade body and the expansion blade, the length of the expansion blade can be changed to easily cope with the difference in the size of the expanded diameter portion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a diameter expanding device showing a state in which a scraper blade and a drilling blade are opened, showing an example of a diameter expanding device for a drilling hole according to the present invention. It is the front view of the diameter expanding apparatus similarly seen from the scraper blade side. It is the side view of the diameter expanding apparatus similarly seen from the excavation blade side. It is IV-IV sectional drawing of FIG. It is a perspective view of the diameter expanding apparatus which shows the state which closed the scraper blade and the excavation blade. It is the front view of the diameter expanding apparatus similarly seen from the scraper blade side. It is the side view of the diameter expanding apparatus similarly seen from the excavation blade side. It is VIII-VIII sectional drawing of FIG. It is a perspective view of the diameter expanding apparatus which shows the state which closed the excavation blade and opened the scraper blade. It is the front view of the diameter expanding apparatus similarly seen from the scraper blade side. It is the side view of the diameter expanding apparatus similarly seen from the excavation blade side. It is sectional drawing which shows the modification of an excavation blade. It is sectional drawing which shows the modification of the scraper expansion blade in a scraper blade. It is sectional drawing which shows the modification of the scraper blade main body in a scraper blade. It is a side view which shows the earth drill with which the bottom expansion bucket was mounted | worn. It is explanatory drawing which shows the state which forms the excavation hole using an excavation bucket. It is explanatory drawing which shows the state which is expanding the diameter of a drilling hole using an expanded bucket. It is explanatory drawing which shows the state which has formed the excavation hole toward the downward direction from the part expanded using the excavation bucket. It is explanatory drawing which shows the preparatory stage for diameter-expanding excavation of the step part of the excavation hole intermediate | middle enlarged diameter part expanded using the diameter expansion apparatus and the bottomed bucket. It is explanatory drawing which shows the state which is carrying out the diameter expansion excavation of the step part of a digging hole intermediate diameter expansion part using a diameter expansion apparatus and a bottomed bucket. It is a figure which similarly shows the state which diameter-excavated the step part of the drilling hole intermediate | middle enlarged diameter part to the predetermined shape. It is explanatory drawing which shows the state which has formed the excavation hole to the predetermined depth using the excavation bucket. It is explanatory drawing which shows the state which is expanding the diameter of a digging hole bottom part using a bottom expansion bucket. It is explanatory drawing which shows the preparatory stage for scraping earth and sand from a digging hole intermediate | middle enlarged diameter part using a diameter expanding apparatus and a bottomed bucket. It is explanatory drawing which shows the state which is scraping off the earth and sand from a digging hole intermediate | middle enlarged diameter part using a diameter expanding apparatus and a bottomed bucket. It is sectional drawing which shows the shape of the formed excavation pile with a node.

  FIG. 1 to FIG. 11 show an example of a diameter expansion device for excavation holes in the present invention. FIG. 1 to FIG. 4 show a state in which the scraper blade and excavation blade are opened, and FIG. 9 to 11 show a state where the blade and the excavation blade are closed, and FIGS. 9 to 11 show a state where the excavation blade is closed and the scraper blade is opened.

  The diameter expansion device 11 shown in the present embodiment includes a rectangular tube-shaped support body 12, two scraper blades 13 and excavation blades 14 that are detachably mounted on the side surface of the support body 12, and the support body 12. And a blade opening / closing cylinder 15 provided inside. The support 12 is formed in a square shape in plan view, and an upper connection portion 16 is provided at the upper end so as to be detachably connected to the lower end of the kelly bar, and a drilling bucket or a bottomed bucket is provided at the lower end. A lower connecting portion 17 is provided for detachably connecting the two.

  In addition, the first support shaft 18 and the second support shaft 19 are alternately provided at four intervals in the circumferential direction of the outer surface of the lower end portion of the support 12 at intervals of 90 degrees. The first support shaft 18 and the second support shaft 19 are respectively supported in the horizontal direction by a pair of first shaft support members 18a and 18a and second shaft support members 19a and 19a that project from the outer surface of the lower end portion of the support body 12. The lower end portion of the scraper blade 13 is rotatably connected to the first support shaft 18, and the lower end portion of the excavation blade 14 is rotatably connected to the second support shaft 19. Thereby, the scraper blade 13 and the excavation blade 14 are formed so that the upper side can swing inward and outward with the respective support shafts 18 and 19 as the center.

  Further, a first elevating member 20 that can be moved up and down in the vertical direction of the support 12 is provided above the first support shaft 18. The first elevating member 20 is provided in a state of passing through the vertically long openings 12 a and 12 a provided on the opposing side surfaces of the support body 12, and both ends project from the opposing side surfaces of the support body 12. . A rod 15a of a blade opening / closing cylinder 15 is connected to a central portion 20a of the first elevating member 20 located inside the support 12 by a pin 15b. A second elevating member 21 that can be elevated in the vertical direction of the support 12 is provided above the second support shaft 19. The second elevating member 21 is framed in a square shape along the four surfaces of the support 12, and is provided in a state surrounding the support 12 above the first elevating member 20.

  A 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 projecting portion of the first elevating member 20 protruding from the opening 12a. The first link mounting pin 23 is provided, and a connecting pin 24, which is a connecting member for detachably connecting the first elevating member 20 and the second elevating member 21, can be inserted in the horizontal direction at the upper portion of the protruding portion. A first insertion hole 25 is provided.

  A base end portion of a second link member 26 that connects the second elevating member 21 and the excavating blade 14 is rotatably attached to a portion of the second elevating member 21 that is 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 formed in a portion of the second lifting member 21 located above the first lifting member 20. A pair of projecting pieces 29, 29 respectively provided are provided in a state of sandwiching 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 are provided in a state of sandwiching the fixed hole 30.

  The scraper blade 13 is formed by a scraper blade main body 33 having a base end 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. A distal end portion of the first link member 22 is rotatably connected to an intermediate portion of the scraper blade main body 33 via a rotation pin 35.

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

  Further, a scraper 13a is provided on the outer surface of the scraper blade 13 for leveling the conical surface expanded in an inverted conical shape, and the outer surface of the excavating blade 14 is used for expanding the excavation in an inverted conical shape. Excavation blade 14a is provided. The scraper 13a and the excavating blade 14a are respectively arranged at the front end edges in the rotation direction of the scraper blade 13 and the excavating blade 14, and the excavating blade 14a is formed to protrude outward from the scraper 13a. As a result, when both the scraper blade 13 and the excavating blade 14 are opened for excavation, the excavating blade 14a excavates the earth and sand, and the scraper 13a scrapes the earth and sand (slime) generated by the excavation. .

  As shown in FIGS. 1 to 8, the diameter expansion device 11 for the excavation hole formed in this way includes a first insertion hole 25 of the first elevating member 20 and a second insertion hole 28 of the second elevating member 21. When the connecting pin 24 is inserted and 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 to each other. 2 The raising / lowering member 21 is in the state which can be raised / lowered. By extending the blade opening / closing cylinder 15 in this connected state, the scraper blade 13 and the excavating blade 14 can be simultaneously opened as shown in FIGS. 1 to 4.

  At this time, since the first elevating member 20 and the second elevating member 21 are integrally raised and lowered via the connecting pin 24, the scraper blade 13 and the excavating blade 14 can be opened and closed equally. On the other hand, by shortening the blade opening / closing cylinder 15, the scraper blade 13 and the excavation blade 14 can be placed in a closed storage state along the outer surface of the support 12 as shown in FIGS. 5 to 8.

  On the other hand, as shown in FIGS. 9 to 11, when the scraper blade 13 and the excavation blade 14 are in the retracted state, the connecting pin 24 is extracted from the first insertion hole 25 and the second insertion hole 28, and the second elevating member 21. The connection state between the first elevating member 20 and the second elevating member 21 is released by inserting the connecting pin 24 into the fixing hole 30 and the through hole 31 of the fixed protrusion 32 provided on the outer surface of the support 12. In addition, the second elevating member 21 can be fixed to the support 12. By extending the blade opening / closing cylinder 15 in this state, only the scraper blade 13 is opened, and the slime removing operation is performed.

  Therefore, it is possible to easily switch between the diameter expansion work state in which the scraper blade 13 and the excavation blade 14 are opened and the slime removal work state in which only the scraper blade 13 is opened, simply by inserting and removing the connecting pin 24.

  12 to 14 show modifications of the scraper blade 13 and the excavation blade 14, respectively. First, FIG. 12 shows a modified example of the excavating blade 14, and is provided with a scraping plate 14 b that obliquely protrudes inward from the center of the side surface in the traveling direction of the excavating blade 14. By providing such a scraping plate 14b, the earth and sand excavated by the excavating blade 14a can be prevented from passing rearwardly from the excavating blade 14, and the earth and sand can be scraped in the inner circumferential direction. Further, by providing the scraper blade 13 with the same scraping plate, it is possible to effectively scrape the slime scraped by the scraper 13a in the inner circumferential direction.

  FIGS. 13 and 14 show a modified example of the scraper blade 13. In FIG. 13, the inner surface of the scraper blade 34 in the scraper blade 13, and the inner surface of the scraper blade body 33 in the scraper blade 13 in FIG. Mountain-shaped projecting portions 34a and 33a having a triangular cross section projecting from the inside are provided. By providing such mountain-shaped protrusions 34a and 33a, it is possible to prevent stones and the like from getting on the inner surface of the scraper expansion blade 34 during diameter expansion work, and the scraper expansion blade 34 can be reliably closed. Further, depending on the shape of the mountain-shaped protrusions 34a and 33a, stones sandwiched between the support body 12 when the scraper blade 13 is closed can be crushed and removed. Such mountain-shaped protrusions can also be provided on the excavating blade 14.

  The said diameter expansion apparatus 11 is used when forming a knot pile using the earth drill 51 shown in FIG. Hereinafter, the usage method of the diameter expansion apparatus 11 is demonstrated based on FIG. 16 thru | or FIG. 26 which shows the formation procedure of a knot pile. The earth drill 51 suspends a telescopic kelly bar 54 rotatably from a tip end portion of a boom 53 provided in a base machine 52 formed of a crawler crane, and also uses a cylinder 55 or the like from a base portion of the boom 53 to rotate a kelly bar rotation driving device 56. The excavation bucket, the bottom expansion bucket, and the like can be attached to the lower end portion of the kelly bar 54 inserted into the hollow cylindrical drive shaft provided in the kelly bar rotation driving device 56.

  First, in the first stage, as shown in FIG. 16, the excavation bucket 57 is attached to the lower end of the kelly bar 54, and the excavation bucket 57 is rotated by the kelly bar rotation drive device 56, and the excavation bucket 57 is rotated and pushed into the ground. By alternately repeating the operation of excavating the ground with the excavation blade 57a at the bottom and the operation of discharging the excavated earth and sand from the excavation bucket 57 by pulling up the excavation bucket 57, a first depth of a preset depth is obtained. A vertical hole 71 is formed.

  After forming the first vertical hole 71, as shown in FIG. 17, the excavation bucket 57 is replaced with a widened bucket 58, and the widened blade 58 a is gradually opened while rotating the widened bucket 58 by rotating the kelly bar 54. The taper portion 72 having a predetermined shape is formed by alternately repeating the operation of expanding the bottom of 71 in a conical shape and the operation of discharging the earth and sand excavated by lifting the expanded bucket 58 from the expanded bucket 58.

  After forming the tapered portion 72, as shown in FIG. 18, the bottom expansion bucket 58 is replaced with the excavating bucket 57 again and the same operation is repeated to form a second vertical hole 73 having a predetermined depth below the tapered portion 72. To do. By excavating and forming the second vertical hole 73 in this manner, a stepped portion 74 having a right corner is formed at a portion where the bottom surface of the tapered portion 72 and the wall surface of the second vertical hole 73 intersect.

  After forming the second vertical hole 73, the excavation bucket 57 is replaced with the diameter expanding device 11 as shown in FIG. The diameter expanding device 11 uses the upper connecting portion 16 and the lower connecting portion 17, and a stabilizer 59 for suppressing vibration of the diameter expanding device 11 is mounted between the Kelly bar 54 and the diameter expanding device 11. In addition to accumulating the earth and sand excavated by the diameter expanding device 11, a bottomed bucket 60 for suppressing vibration of the diameter expanding device 11 is connected to a lower portion of the diameter expanding device 11. Moreover, when connecting these up and down, generation | occurrence | production of a vibration can be reduced more reliably by forming each fitting length of the upper connection part 16 and the lower connection part 17 long.

  The stabilizer 59 is formed so as to more reliably suppress the core runout of the diameter expanding device 11 by bringing the stabilizer blade 59 a into contact with the peripheral wall of the first vertical hole 71. The bottomed bucket 60 does not have an excavating blade at the bottom, and does not excavate downwards even when rotated, and has a structure for scooping the slime accumulated in the bottom of the vertical hole into the bucket, so that the bottom is settled. Thus, the diameter expansion device 11 can be reliably held at the diameter expansion work position.

  Then, as shown in FIG. 20, the kelly bar 54 is rotated with the bottomed bucket 60 bottomed, the diameter expanding device 11 is rotated via the stabilizer 59, and the hydraulic oil supply unit 11a is connected from a hydraulic hose (not shown). The hydraulic oil is supplied through the cylinder, the blade opening / closing cylinder 15 is extended, and the scraper blade 13 and the excavation blade 14 are gradually opened. As a result, the corners of the stepped portion 74 are gradually excavated by the excavating blade 14a of the excavating blade 14, and the diameter is expanded to form an inverted conical shape.

  At this time, the diameter expansion operation can be performed at a preset position without fixing the vertical direction of the kelly bar 54 by performing the diameter expansion operation by landing the bottomed bucket 60 having no excavation function. it can. During this diameter expansion operation, the operation of discharging the earth and sand in the bottom scooping bucket 60 scraped off by the scraper blade 13 and the excavation blade 14 is repeated as appropriate.

  During the diameter expansion work, since the total four blades of the scraper blade 13 and the excavation blade 14 of the diameter expansion device 11 are in an open state uniformly, the center deflection of the diameter expansion device 11 can be suppressed, The diameter expansion work can be performed in a stable state. In particular, since the excavating blade 14a protrudes outward from the scraper 13a, the scraper 13a does not scrape the unexcavated ground portion, and the excavation of the ground by the excavating blade 14a can be performed efficiently and reliably. .

  Furthermore, the stabilizer 59 is connected to the upper side and the bottomed bucket 60 is connected to the lower side to perform the diameter expansion operation, whereby the core of the diameter expansion device 11 can be held more securely. Can be excavated reliably to form a tapered surface 75 having an inverted conical shape set in advance.

  As shown in FIG. 21, the step 74 is excavated by the diameter expanding operation of the diameter expanding device 11 to form the node 76 having the tapered surface 75 having a predetermined shape, and then the stabilizer 59, the diameter expanding device 11, and the bottomed bucket. 60 is removed and the excavation bucket 57 is attached to the kelly bar 54 again, and as shown in FIG. 22, the second vertical hole 73 is further dug to form a third vertical hole 77 reaching the support layer. At this time, when the nodes are formed at a plurality of positions in the middle of the vertical hole, a plurality of nodes can be formed at an appropriate position of the vertical hole by repeating the procedure shown in FIGS.

  After forming the third vertical hole 77, as shown in FIG. 23, the excavation bucket 57 is replaced with a bottom expansion bucket 58, and the bottom of the third vertical hole 77 is conically expanded in the same manner as described above. Thereby, the expanded bottom part 78 of a predetermined shape can be formed in a pile head. Next, as shown in FIG. 24, the bottom expansion bucket 58 is replaced with a stabilizer 59, a diameter expansion device 11, and a bottom scooping bucket 60. At this time, the connection pin 24 is extracted from the first insertion hole 25 and the second insertion hole 28, the extracted connection pin 24 is inserted into the fixing hole 30 and the through hole 31, and the second elevating member 21 is fixed to the support body 12. Keep it.

  Then, as shown in FIG. 25, the blade opening / closing cylinder 15 is extended at a position corresponding to the tapered surface 75, and only the scraper blade 13 is opened and rotated, so that the slime on the tapered surface 75 is removed from the bottom bucket 60. Let it fall inside. Thereby, the node part 76 which removed the slime from the taper surface 75 can be formed.

  In this manner, the knotted pile 79 having a predetermined shape can be formed by sequentially performing the operations shown in FIGS. In particular, since the switching between the diameter expanding operation and the slime removing operation can be performed only by inserting / removing the connecting pin 24, both operations can be easily switched in a short time. Further, by exchanging the scraper expansion blades 34 and the excavation expansion blades 37 with appropriate lengths, it is possible to easily perform the diameter expansion operation of the nodes having different diameters.

  In the embodiment, the square cylindrical support is formed in a square shape, and two scraper blades and two excavation blades are alternately provided. However, the support is formed in a hexagonal shape, and the scraper blade is formed. And three excavating blades may be provided alternately. Also, by connecting the excavation bucket to the lower connecting part of the diameter expansion device via a swivel, it is possible to prevent the rotation of the diameter expansion device from being transmitted to the excavation bucket. However, the diameter expanding device can be stabilized while avoiding the downward excavation by the excavation bucket, and the excavated earth and sand can be discharged.

  DESCRIPTION OF SYMBOLS 11 ... Diameter expansion apparatus, 11a ... Hydraulic oil supply part, 12 ... Support body, 12a ... Opening, 13 ... Scraper blade, 13a ... Scraper, 14 ... Excavation blade, 14a ... Excavation blade, 14b ... Scratch plate, 15 ... Blade Opening and closing cylinder, 15a ... rod, 15b ... pin, 16 ... upper connecting portion, 17 ... lower connecting portion, 18 ... first support shaft, 18a ... first shaft support member, 19 ... second support shaft, 19a ... second Axis support member, 20 ... first elevating member, 20a ... central portion, 21 ... second elevating member, 22 ... first link member, 23 ... first link mounting pin, 24 ... connecting pin, 25 ... first insertion hole, 26 ... 2nd link member, 27 ... 2nd link mounting pin, 28 ... 2nd insertion hole, 29 ... Projection piece, 30 ... Fixed hole, 31 ... Through hole, 32 ... Fixed projection piece, 33 ... Scraper blade main body, 34 ... scraper expansion wings, 33a, 34a ... mountain-shaped protrusions, 35 ... Moving pin, 36 ... excavation blade main body, 37 ... excavation expansion blade, 38 ... rotation pin, 51 ... earth drill, 52 ... base machine, 53 ... boom, 54 ... kellyba, 55 ... cylinder, 56 ... kellyba rotation drive device, 57 ... Excavation bucket, 57a ... Excavation blade, 58 ... Expanded bucket, 58a ... Expanded blade, 59 ... Stabilizer, 59a ... Stabilizer blade, 60 ... Bottom scooping bucket, 71 ... First vertical hole, 72 ... Tapered portion, 73 ... No. 2 vertical holes, 74 ... stepped part, 75 ... tapered surface, 76 ... node part, 77 ... third vertical hole, 78 ... widened part, 79 ... pile with knot

Claims (6)

  A diameter expanding device connected to the lower end of the kelly bar through an upper connecting portion, and is provided in a cylindrical support body detachably connected to the lower end of the kelly bar, and provided in a circumferential direction on the outer surface of the lower end part of the support body. The first and second support shafts in the horizontal direction, the scraper blade whose lower end is connected to the first support shaft and swingable on the upper side, and the lower end is connected to the second support shaft. Excavation blades that are swingable on the upper side, a first elevating member that can be raised and lowered in the vertical direction of the support above the first support shaft, and a support above the second support shaft A second lifting member provided so as to be movable up and down, a first link member that connects the first lifting member and the scraper blade and swings the scraper blade as the first lifting member moves up and down. And connecting the second elevating member and the excavating blade, and as the second elevating member moves up and down A second link member that swings the excavating blade, a blade opening / closing cylinder that lifts and lowers the first lifting member, and a connecting member that removably connects the first lifting member and the second lifting member. A plurality of the scraper blades and a plurality of the excavating blades are alternately provided at equal intervals in the circumferential direction around the support, and a drilling blade provided on the outer surface of the excavating blade is provided on the outer surface of the scraper blade An apparatus for expanding the diameter of a drilling hole, characterized by being protruded outward.   The diameter expansion device of the drilling hole according to claim 1, wherein a lower connecting portion is provided at a lower end portion of the support body.   A connecting member that detachably connects the first elevating member and the second elevating member, and a second elevating member elevating restriction member provided on the upper side surface of the support body and the second elevating member are detachably connected. The diameter expansion device of a drilling hole according to claim 1 or 2, wherein the same connecting pin is used for the connecting member.   The scraper blade and the excavation blade are connected to the first support shaft or the second support shaft, and a blade main body to which the first link member or the second link member is connected, and a tip of the blade main body. 4. The drilling hole diameter expanding apparatus according to claim 1, wherein the drilling hole diameter expanding apparatus is formed by an expansion blade that is detachably mounted.   The drilling hole expansion according to any one of claims 1 to 4, wherein the scraper blade and the excavation blade are provided with a scraping plate that obliquely protrudes inward from the side surface in the traveling direction. Diameter device.   6. The drilling hole diameter increasing device according to claim 1, wherein a mountain-shaped projecting portion having a triangular cross section projecting inside is provided on an inner surface of the scraper blade and the drilling blade. .

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