JP3452084B2 - Drilling rig - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a digging apparatus for digging ground. 2. Description of the Related Art In the construction of cast-in-place piles, a construction method using a hamag lab has been widely used. FIGS. 5 to 8 show the working process of a cast-in-place pile method using a hammer grave. As shown in FIGS. 5 and 6, prior to excavation of the ground 1, first, a cutting edge is formed at a lower end. Is inserted into the ground 1 with the chuck device 5 shown in FIG. 1 of FIG. 1 or FIG. 9 of the present application, or
With the chuck device disclosed in FIG. 15 of JP-B-63-65796, the casing tube 3 is rocked and penetrated into the ground 1,
The hole wall 7 is protected during excavation. [0006] While connecting the casing pipes 3 sequentially according to the excavation depth and penetrating them into the ground 3, a crawler crane (not shown) via a wire rope 9 as shown in FIGS. 6 and 7. The excavated earth and sand in the casing tube 3 is discharged by the hammer cradle 11 suspended in the container, and after the discharging operation is completed, the rebar cage 13 is inserted and the casing tube 3 is pulled out while placing concrete 15 as shown in FIG. A pile is formed on the ground 1. FIG. 9 is a schematic view of the chuck device 5. In the chuck device 5, wedges 15 arranged at equal intervals around the entire circumference of the casing tube 3 are provided with a bearing 19 of an upper ring 17 and a bearing 23 of a thrust frame 21. When the chuck cylinder 25 shrinks, the wedge 15
Cuts between the casing tube 3 and the cone ring 27 to hold the casing tube 3. When the hydraulic motor 29 is driven,
The rotation torque is transmitted to the casing tube 3 via the cone ring 27, and the casing tube 3 is pushed and pulled by extending and contracting the thrust cylinder 31 with the wedge 15 biting. . [0007] According to the above-mentioned cast-in-place pile method, reliable excavation can be performed without affecting the surrounding ground. Since there is no such structure, there is an advantage that construction can be performed in the vicinity of an adjacent structure. However, in a hard ground (for example, Dotan), a hole having a closed shape of the shell 11a serving to excavate the tip of the hammer club 11 and grasp the soil is likely to be formed, and once such a hole is formed, Even if the hammer club 11 is dropped into the casing tube 3 with the shell 11a opened, there is a disadvantage that the landed shell 11a is closed and the excavation efficiency is significantly reduced. Further, when the water level in the hole is present, it is pointed out that the excavated soil is washed away from the gap of the shell 11a in the gravel layer, so that the excavation efficiency is lowered, and that the excavation efficiency for the cobblestone layer is poor. The present invention has been devised in view of the above circumstances, and has as its object to solve the above-mentioned drawbacks of the prior art and to provide an excavator excellent in excavation efficiency and workability. [0011] In order to achieve the above object, an excavator according to the present invention includes a crawler driving device mounted on an upper end portion of a casing pipe penetrating the ground and a crawler crane. A telescopic kerry bar suspended via a wire rope and driven to rotate by a keliver drive device, and a drilling bucket fixed to the tip of the keliever and rotated in conjunction with the rotation of the keliver, the keliever drive device comprises: From inside the casing tube of the drilling bucket
Lifting and drilling into the casing tube of the bucket
Formed at the upper end of the casing pipe as the
Locking fitting that can be engaged and disengaged with multiple guides provided on the outer periphery of the part
A fitting portion having a plurality of notches for is formed at a lower end portion,
A pedestal detachable from the casing tube by a drilling bucket pulled up from the casing tube, a ring gear rotatably mounted on the pedestal, and having a kelly bar rotation hole for charging the kelly bar, and a ring gear mounted on the pedestal; And a driving device for rotating. According to the present invention, the drilling bucket is connected to the case.
And insert the pedestal into the casing pipe
And fitting the pedestal to the guide provided at the fitting part of the casing tube
The notch provided in the section engages, and the
It is fitted to the upper end of the singing tube by rotation. Then, when the driving device of the kelly bar driving device is operated, the ring gear rotates with the casing tube acting as a reaction force, and the ring gear rotates the kelly bar, so that the drilling bucket at the tip thereof drills excavated earth and sand in the casing tube. When the drilling bucket is filled with the excavated earth and sand, the kerry bar is retracted and the drilling bucket is lifted up from the casing tube. When the drilling bucket contacts the pedestal, the notch engages with the guide.
Is released, and the kerry bar drive device is removed from the upper end of the casing tube, and the kerry bar drive device is suspended from the crawler crane together with the drilling bucket. After the excavation work of the excavated earth and sand is completed, when the pedestal is fitted into the casing pipe while the drilling bucket is inserted into the casing pipe again, the notch and the guide are interposed.
As a result, the keriba driving device is again locked and fitted to the upper end of the casing tube. Embodiments of the present invention will be described below in detail with reference to the drawings. The chuck device 5 used in the present embodiment is shown in FIG.
Since it is the same as that described in the above, the description of the structure is omitted. FIG. 1 shows an excavation state of the ground using an excavator according to an embodiment of the present invention. In FIG. 1, reference numeral 43 denotes a chuck device 5 prior to excavation, like the casing pipe 3 shown in FIG. As a result, the casing wall 43 of the boring hole 47 is protected by the casing tube 43 which is rotatably penetrated into the ground 45. A kerry bar driving device 51 is mounted on an upper end portion of the casing tube 43. The kerry bar driving device 51 is fitted to the upper end portion of the casing tube 43 so as to stop and rotate as shown in FIGS. The pedestal 53 includes a ring gear 55 rotatably mounted on the pedestal 53, and a plurality of hydraulic motors 57 for rotating the ring gear 55. As shown in FIG. 3, the pedestal 53 is a cylindrical body having the same outer diameter as the casing tube 43, and two plate portions 59 and 61 are formed in the upper and middle portions thereof in parallel. Kelly bar insertion holes 65 and 6 slightly larger in diameter than a kelly bar 63 described later are provided at the centers of both plate portions 59 and 61, respectively.
7 are provided. The lower end of the pedestal 53 and the upper end of the casing tube 43 are respectively provided with thin fitting portions 53.
a, 43a are formed, and the fitting portion 53a of the pedestal 53 is formed.
The guide 71 provided on the outer periphery of the fitting portion 43a of the casing tube 43 engages with the plurality of notches 69 provided on the
Is stopped. On the lower plate portion 61, an annular ball bearing 72 is arranged at the peripheral edge of the kelever insertion hole 67, and the ring gear 55 is moved in the circumferential direction of the pedestal 53 via the ball bearing 72. It is rotatably mounted. And, in the center of the ring gear 55,
A kelly bar rotation hole 73 is formed so as to have the same central axis as the kelly bar insertion holes 65 and 67. Further, as shown in FIG. 2, eight hydraulic motors 57 are arranged on the upper plate portion 59 along the outer peripheral edge of the ring gear 55, and are attached to the motor shafts 57a of the respective hydraulic motors 57. The pinion gears 75 are configured to mesh with the ring gear 55, respectively. Each hydraulic motor 57 has the same drive source as the hydraulic motor 29 of the chuck device 5. On the other hand, in FIG.
7 is a telescopic telescopic type kerry bar suspended from a crawler crane 79 via a wire rope 77, and a wire rope 77 passes through a pulley 81 mounted in the
7a is fixed to the mast 83 of the crawler crane 79. On the outer periphery of the outermost cylinder 63a of the kelly bar 63, as shown in FIG. 2, an engagement protrusion 87 that engages with a plurality of engagement recesses 85 provided in the kelly bar rotation hole 73 is provided in the axial direction. The engagement projection 87 engages with the engagement recess 85 in this manner, so that the kelly bar 63 is driven to rotate by the ring gear 55. A drilling bucket 89 is bolted to the tip of the kelly bar 63. As in the conventional case, the kelly bar 63 is rotated to cut excavated earth and sand from a cutting edge (not shown) at the bottom of the kelly bar 63, thereby excavating. When the soil fills the drilling bucket 89, the kelly bar 63 is retracted and pulled up from the casing tube 43, and the excavated earth 91 is discharged by opening the bottom 89a as shown in FIG. Thus, when the drilling device according to the present embodiment retracts the kelly bar 63 and pulls up the drilling bucket 89 from the casing tube 43, as shown by the two-dot chain line in FIG. The kelly bar driving device 51 is detached from the upper end of the casing tube 43 in contact with the plate portion 61 of the pedestal 53, and is suspended by the crawler crane 79 together with the drilling bucket 89. Then, after the excavation work of the excavated earth and sand is completed, while the drilling bucket 89 is inserted into the casing pipe 43 again, both the fitting portions 53a, 4 of the pedestal 53 and the casing pipe 43 are inserted.
If the guide 71 is engaged with the notch 69 by fitting the 3a, the kelly bar driving device 51 is again locked to the upper end of the casing tube 43. Since the excavator according to the present embodiment is constructed as described above, in order to excavate the ground 45 with such an excavator, as in the prior art, first, prior to the excavation, first, the chuck device 5 is used.
Then, the casing pipe 43 is rotatably penetrated into the ground 45 to protect the hole wall 49 at the time of excavation. The casing pipes 43 are sequentially connected in accordance with the excavation depth and are rotationally penetrated into the ground 45. When a predetermined casing pipe 43 is penetrated into the ground 45, a drilling bucket is inserted into the casing pipe 43. Insert 89. As described above, the drilling bucket 89
Is bolted to the tip of a telescopic Keriba 63 suspended on a crawler crane 79.
, The drilling bucket 89 descends into the casing tube 43. At this time, the kelly bar 63 is inserted into the kelly bar rotation hole 73 of the ring gear 55,
As shown in FIG. 4, the kerry bar drive device 51 is on the drilling bucket 89, and when the drilling bucket 89 descends into the casing tube 45, the pedestal 53
Is fitted into the fitting portion 43a of the casing tube 43, and if the guide 71 is engaged with the notch 69,
The kelly bar driving device 51 is fitted to the upper end portion of the casing tube 43 so as to prevent rotation. Then, the wedge 15 of the chuck device 5 is bitten between the casing tube 43 and the cone ring 27, and the kelly bar driving device 5 is held while the casing tube 43 is held.
When the first hydraulic motor 57 is driven, the casing tube 43
As a reaction force, the ring gear 55 rotates, and in conjunction with this, the kelly bar 63 rotates, and the drilling bucket 89 cuts the excavated earth and sand in the casing pipe 43 from the cutting hole at the bottom of the hole. Then, when the excavated soil fills the drilling bucket 89, the kelly bar 63 is retracted to lift the drilling bucket 89 from the casing pipe 43, and the bottom 89a is opened to discharge the excavated soil 91 as shown in FIG. As described above, the keriba 63 is retracted and the drilling bucket 89 is removed from the casing tube 43.
When pulling up, the drilling bucket 89 comes into contact with the plate portion 61 of the pedestal 53, and the kelly bar driving device 51 is removed from the upper end of the casing tube 43. After the excavation work of the excavated earth and sand is completed, while the drilling bucket 89 is again inserted into the casing tube 43, both fitting portions 53a of the pedestal 53 and the casing tube 43 are formed.
If the guide 71 is engaged with the notch 69 by fitting the 43a, the kelly bar driving device 51 is locked again to the upper end portion of the casing tube 43. You can proceed. As described above, when the excavator according to the present embodiment is used, as in the conventional method shown in FIG. 5, reliable excavation can be performed without affecting the surrounding ground. Because there is no influence of the structure, it can be constructed close to the adjacent structure. As described above, a disadvantage of the construction method shown in FIG. 5 is that in a hard ground (for example, Dotan), a hole having a closed shape of a shell that serves to excavate the tip of a hammer club and grasp the soil is formed. Once such a hole is formed, there is a disadvantage that even if the hammer club is dropped into the casing pipe with the shell opened, the landed shell is closed and the excavation efficiency is significantly reduced. However, the excavator of the present embodiment does not use a hammer grave, and has an advantage that when the excavation efficiency is deteriorated due to the hard ground, the efficiency can be improved by centering with a small diameter drilling bucket. . Further, in this embodiment, the drilling bucket 89 is used in place of the hammer club, so that the excavation efficiency for the cobblestone layer is improved as compared with the conventional example shown in FIG. 5, and excavation can be performed regardless of the groundwater. Since the amount of excavated soil per one drilling bucket 89 is several times larger than that of a hammer grave, the excavation efficiency is improved. In addition, in this embodiment, the kelly bar 63 is retracted and the drilling bucket 89 is removed from the casing tube 43.
When pulling up, the drilling bucket 89 comes into contact with the plate portion 61 of the pedestal 53, and the kelly bar driving device 51 is removed from the upper end of the casing tube 43. Also, after the excavation work of the excavated earth and sand is completed, the drilling bucket 89 is again put into the casing The pedestal 53 and the casing tube 4 are inserted into the tube 43.
If the guides 71 are engaged with the notches 69 by fitting the two fitting portions 53a and 43a of the third, the kelly bar driving device 51 is again stopped and fitted to the upper end of the casing tube 43, so that workability is improved. Good. In the above embodiment, the casing pipe 43 is rotatably penetrated into the ground 45 by the chuck device 5.
The method of penetrating the casing tube 43 into the casing 5 is not limited to the rotation by the chuck device 5 described above, but is also described in JP-B-63-657 described above.
The casing tube 43 may be swung into the ground 45 by the chuck device disclosed in FIG. This conventional chuck device is provided with a swing cylinder that swings the casing tube in the direction around the casing tube, instead of the hydraulic motor 29 shown in FIG. 9, and the excavating device according to the present invention has such a structure. It is also possible to mount the kelly bar driving device 51 on the upper end of the casing tube 43 which is rocked and penetrated into the ground 45 by the chuck device. Keriva driving device 5 at the upper end of the casing pipe penetrating the ground with
1 can also be attached. Also, according to each of these embodiments, it is possible to achieve the intended purpose as in the above-described embodiment. As described above, according to the excavator of the present invention, reliable excavation can be performed without affecting the surrounding ground, and even if the ground has a soft layer, the influence of the collapse of the ground can be obtained. Because there is no construction, it can be constructed close to the adjacent structure. Further, according to the excavator of the present invention, excavation can be efficiently performed even on hard ground irrespective of groundwater, and at the same time, the drilling bucket is pulled up from the casing pipe by retracting the kelly bar for the excavation work of excavated earth and sand. When
Since the drilling bucket comes into contact with the pedestal of the kelever driving device and the kelever driving device is removed from the casing tube, the kerry bar driving device does not become a hindrance, and the workability at the time of unloading is good.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an excavation state of a ground using an excavator according to one embodiment of the present invention. FIG. 2 is a plan view of the kerryba driving device. FIG. 3 is a sectional view taken along line III-III of FIG. 2; FIG. 4 is an explanatory diagram of an earth removal process of excavated earth and sand. FIG. 5 is an operation process diagram of a conventional cast-in-place pile method using a hammer rub. FIG. 6 is a view showing a process of rotating and penetrating a casing tube. FIG. 7 is a diagram showing a process of discharging excavated earth and sand. FIG. 8 is a process chart of concrete placing. FIG. 9 is a schematic configuration diagram of a conventional general chuck device. [Description of Signs] 5 Chuck device 43 Casing tube 45 Ground 47 Boring hole 49 Hole wall 51 Keriva driving device 53 Pedestal 55 Ring gear 57 Hydraulic motor 59, 61 Plate portion 63 Keriva 65, 67 Keriva insertion hole 72 Ball bearing 73 Keriva rotation hole 75 Pinion gear 89 Drilling bucket

Claims (1)

(57) [Claims 1] Kelly bar driving device mounted on the upper end of a casing pipe penetrating into the ground, suspended by a crawler crane via a wire rope, and rotated by the kelever driving device and telescopic Keriba being driven, is secured to the tip of Keriba consists of a drilling bucket which rotates in conjunction with rotation of Keriba, Keriba drive, raising及from the casing pipe of drilling bucket
And lower the drilling bucket into the casing tube.
On the outer periphery of the fitting part formed at the upper end of the casing tube.
Multiple guides for detent fitting that can be disengaged from multiple guides
A fitting portion having a notch is formed at a lower end portion, and a pedestal is detachable from the casing tube by a drilling bucket pulled up from the casing tube , and a kelly bar rotation hole rotatably mounted on the pedestal and charging the kelly bar is provided. An excavator comprising: a formed ring gear; and a driving device mounted on the pedestal and rotating the ring gear.