JP5871367B2 - Drilling rig - Google Patents

Description

  The present invention relates to an excavation apparatus for excavating a hole for pile driving or the like by pushing a casing tube into the ground while rotating it and performing construction such as discharging of earth and sand in the tube with a grounding tool such as a bucket. In particular, it relates to earth and sand discharge technology.

  Conventionally called so-called casing rotary excavation, a tubular steel casing tube is pushed into the ground while being rotated by a tube rotating device, and the earth and sand in the casing tube is used with ground tools such as hammer grabs and buckets. A technique for excavating and discharging soil is known (for example, see Patent Document 1).

  According to this prior art, when discharging sediment by the bucket, the bucket is attached to the tip of the kelly bar suspended from the base machine equipped with the crane device and the rotary drive device, the bucket is inserted into the casing tube, and the kelly bar is attached to the crane. By rotating with a rotary drive device attached to the apparatus, the earth and sand in the casing tube is taken in by the bucket.

JP 2002-70469 A

  However, according to the conventional excavator, when using a ground tool such as a bucket, a large base machine that can suspend and rotate the kelly bar separately from the tube rotating device that rotates the casing tube is required. is there. For this reason, the apparatus became large, and it was necessary to secure a large site and a sufficient height for construction.

  Therefore, an object of the present invention is to provide an excavator that can perform construction compactly without requiring a rotary drive device dedicated to ground tools.

To achieve the above object, the excavator of the present invention is an excavator provided with a tube rotating device that pushes down while rotating a casing tube on the ground,
A ground tool that can be inserted into the casing tube and is connected to the tip of a shaft-shaped kelly bar and can be grounded by rotation, and is connected to the casing tube, and the rotation of the casing tube is controlled by the casing tube. And a rotation transmission mechanism capable of transmitting to the Kerryba in the inserted state.

Here, the rotation transmission mechanism may be a transmission mechanism that shifts and transmits the rotation speed of the casing tube to the kelly bar.
The rotation transmission mechanism is a planetary gear having a ring gear coupled to the casing tube, a sun gear through which the kelly bar is inserted so as to be able to transmit rotation, and a carrier for transmitting the rotation of the ring gear to the sun gear. A stopper mechanism that includes a mechanism and restricts the revolution of the carrier may be supported by the tube rotating device.
Furthermore, the planetary gear mechanism may have a structure in which the rotation direction of the planetary gear mechanism is reversed with respect to the rotation direction of the ring gear.

  In addition, a joint tube that can be connected to the upper end of the casing tube and connected to the ring gear is provided, and a positive direction that is a rotation direction when the casing tube is pushed down is provided between the joint tube and the ring gear. An engagement mechanism that engages in the rotation direction and the axial direction during rotation and disengages the engagement during reverse rotation may be provided.

When the casing tube is rotated by the tube rotating device, the excavating device of the present invention configured as described above rotates the kelly bar through the rotation transmission mechanism, and the ground tool disposed in the casing tube is rotated. Can be performed.
Therefore, a rotary drive device dedicated to Keriba is not required, and excavation can be performed in a compact manner.

In addition, if a speed change mechanism is used as the rotation transmission mechanism, the ground tool can be rotated at the optimum rotation speed without changing the rotation speed of the tube rotation device.
Furthermore, if the planetary gear mechanism is used as the rotation transmission mechanism and the revolution of the carrier is restricted by the stopper mechanism supported by the tube rotating device, the rotation of the casing tube is transmitted to the kelly bar via the planetary gear mechanism. The degree of freedom in setting the gear ratio including the direction of rotation output to the ground tool and constant speed is high.
Further, when the planetary gear mechanism is such that the rotation direction of the sun gear is reversed with respect to the ring gear, the ground tool rotates in the opposite direction with respect to the casing tube.
In this case, with the rotation of the casing tube, the soil in the casing tube is rotated in the same direction as the casing tube, while the ground tool rotates in the direction opposite to the direction of rotation of the soil. Thereby, ground construction efficiency improves compared with what a ground tool rotates in the same direction as a casing tube.

  In addition, if the joint tube is connected to the casing tube and an engagement mechanism is provided between the joint tube and the ring gear, it is possible to engage and disengage the planetary gear mechanism simply by rotating the casing tube. There is simple operation. Further, by interposing the joint tube, it is possible to use an existing casing tube without processing, and it is excellent in versatility.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view shown in the state which cut | disconnected the ground explaining the structure of the excavation apparatus of the 1st Embodiment of this invention. It is a top view of the stopper mechanism of the excavation apparatus of 1st Embodiment. It is sectional drawing which shows the gearbox of the excavation apparatus of 1st Embodiment, Comprising: The cross section by the S3-S3 line of FIG. 4 is shown. It is sectional drawing which shows the gearbox of the excavation apparatus of 1st Embodiment, Comprising: The cross section by the S4-S4 line | wire of FIG. 3 is shown. It is a top view which shows the gearbox of the excavation apparatus of 1st Embodiment, Comprising: The cross section by the Y5-Y5 line | wire of FIG. 4 is shown. It is a side view explaining the work procedure of the excavator of a 1st embodiment. It is sectional drawing of the state seen from the top which shows the gearbox of the excavation apparatus of 2nd Embodiment. It is a longitudinal cross-sectional view which shows the speed up gear of the excavation apparatus of 2nd Embodiment.

(First embodiment)
Hereinafter, an excavator A according to a first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the excavator A includes a tube rotating device 1, a speed increaser (rotation transmission mechanism: transmission mechanism) 2, and a stopper mechanism 3.

  The tube rotating device 1 is a well-known device that can push the casing tube 4 into the ground by holding the outer periphery of the casing tube 4 and pushing it down in the axial direction while rotating the casing tube 4. To briefly explain the configuration, the tube rotating device 1 includes a support beam 11, a base frame 12, and a reaction force receiving frame 13.

The support beam 11 is fixed on the ground GR and supports the entire excavator A including the tube rotating device 1.
The base frame 12 is supported by the support beam 11 via a plurality of horizontal jacks 14, and is installed horizontally by adjusting the vertical dimension of each horizontal jack 14.
The reaction force receiving frame 13 is supported on the base frame 12 via a plurality of elevating cylinders 15, and is supported so as to be able to move up and down with respect to the base frame 12 as the elevating cylinders 15 extend and contract.

Further, the base frame 12 is provided with a rotation driving device 16 that applies a rotation driving force to the rotation frame that is in contact with the outer periphery of the casing tube 4. As is well known, the rotation driving device 16 includes a plurality of motors, and the rotations of these motors are transmitted to the casing tube 4 via the rotating frame. Further, the pressing force by the reaction force receiving frame 13 is transmitted to the casing tube 4 through the rotating frame of the rotation driving device 16.
Therefore, the casing tube 4 is pushed into the ground while being rotated by rotating the elevating cylinder 15 while rotating the rotating frame by the rotation driving device 16.

Next, the speed increaser 2 and the stopper mechanism 3 will be described.
The speed increaser 2 and the stopper mechanism 3 are provided in the tube rotating device 1 when the earthing device (ground tool) such as the drilling bucket 51 or the bottom expansion bucket 52 is used for earthing the casing tube 4 or the like. Install and use.
Therefore, when only rotating and pressing the casing tube 4, the speed increaser 2 and the stopper mechanism 3 are removed from the tube rotating device 1.

The speed increaser 2 accelerates the rotation of the casing tube 4 and transmits it to the ground tool. In this embodiment, the rotation transmission to the drilling bucket 51 and the bottom expansion bucket 52 as the ground tool includes: Kelly bar 6 is used as in the conventional case.
As shown in FIG. 3, the speed increaser 2 includes a rotation transmission mechanism including a ring gear 21, a carrier 22, and a sun gear 23, and a planetary gear mechanism 20 as a speed change mechanism. That is, in the present embodiment, the ring gear 21 rotates integrally with the casing tube 4, and the revolution of the carrier 22 is restricted by the stopper mechanism 3, so that the sun gear 23 is rotated at an increased speed, and the rotation is the ground tool. Is transmitted to. In the present embodiment, a so-called double pinion type carrier 22 is interposed between the ring gear 21 and the sun gear 23 so that the rotation direction of the ring gear 21 and the rotation direction of the sun gear 23 are the same. ing.

Next, the carrier 22 will be described.
As shown in FIG. 4, the carrier 22 includes three sets of two pinion gears 22 a rotatably supported on the rotary shaft 26 interposed in series between the ring gear 21 and the sun gear 23. Yes. Each rotary shaft 26 is supported by fixing upper and lower ends thereof to the upper cover 24 and the lower cover 25. Each cover 24, 25 is formed in a donut plate shape having a through hole 24a, 25a at the center. A cylindrical casing 24 b is erected upward from the inner periphery of the through hole 24 a of the upper cover 24.
The ring gear 21 is engaged with upper and lower flange members 21f and 21f extending from the upper and lower edges to the inner periphery with the outer peripheral edges of the upper and lower covers 24 and 25, and is coaxially moved up and down relative to the upper and lower covers 24 and 25. While being regulated, it is supported so as to be relatively rotatable.
The sun gear 23 is supported so as to be rotatable relative to the upper and lower covers 24, 25 with a bearing 25 b interposed between the sun gear 23 and the lower cover 25.

Next, rotation transmission of the planetary gear mechanism 20 will be described.
The rotation of the ring gear 21 is transmitted from the casing tube 4.
In the present embodiment, when the speed increaser 2 is used, as shown in FIG. 1, a joint tube 41 formed by shortening the axial dimension of the casing tube 4 is attached to the upper end of the casing tube 4. Since the joint tube 41 and the casing tube 4 are coupled with each other by using a structure similar to the coupling structure of the other casing tubes 4, description thereof is omitted.
The joint tube 41 has a plurality of engaging arms 41a projecting upward from the outer periphery thereof. In the present embodiment, three engagement arms 41a are provided. Furthermore, the end of the engagement arm 41a has a flange 41b extending in a clockwise direction when viewed from above.

  On the other hand, on the outer periphery of the ring gear 21, as shown in FIG. 3, one or a plurality of engagement rods 21a in the present embodiment protrude in the outer diameter direction. Therefore, when the tube rotating device 1 is driven and the joint tube 41 is rotated integrally with the casing tube 4 in the clockwise direction as viewed from above, the engagement arm 41a of the joint tube 41 and the ring The engagement rod 21a of the gear 21 engages in the rotation direction and engages in the axial direction, so that the joint tube 41 and the ring gear 21 integrally rotate positively.

Next, the rotation transmission structure from the sun gear 23 to the ground tool will be described.
A plurality of spline-like key grooves 23 a are formed on the inner periphery of the sun gear 23. A key 61 formed on the outer periphery of the kelly bar 6 is inserted into the key groove 23a. The key groove 23a is provided with a well-known lock mechanism (not shown). When the sun gear 23 rotates in the forward direction, the key gear 23a is engaged in the circumferential direction and the axial direction, and the rotation of the sun gear 23 is caused by the kelly bar 6a. The driving force in the push-down direction can also be transmitted. Further, the engagement by the lock mechanism is released when the sun gear 23 is rotated in the reverse direction. Such a locking mechanism is well known and is described in, for example, Japanese Patent Application Laid-Open No. 2 0 0 4-1 0 0 3 6 4. Similarly, the kelly bar 6 is also formed to be extendable and contractable by a plurality of rods, and can be engaged between the rods during forward rotation to transmit rotation and push-down force, and can be engaged during reverse rotation. It has a well-known structure in which the released rotation and push-down force are not transmitted.
Therefore, when the sun gear 23 rotates forward, the kelly bar 6 rotates integrally therewith, and the grounding tools such as the drilling bucket 51 and the bottomed bucket 52 attached to the tip of the kelly bar 6 are rotated and pushed down together with the casing tube 4. It is done.

Next, the stopper mechanism 3 will be described with reference to FIGS.
The stopper mechanism 3 prevents the upper and lower covers 24 and 25 of the speed increaser 2 and the rotation shaft 26 of the carrier 22 shown in FIG. 3 supported by the speedup gear 2 from revolving with the rotation of the ring gear 21 and the sun gear 23. The upper and lower covers 24, 25 and the rotary shaft 26 are restricted relative to the reaction force receiving frame 13 of the tube rotating device 1 shown in FIG. To do.

The stopper mechanism 3 includes a mechanism that is detachably attached to the reaction force receiving frame 13 of the tube rotating device 1 and a mechanism that is attached to the upper cover 24.
As shown in FIGS. 1 and 2, the part that can be attached to and detached from the reaction force receiving frame 13 can be attached to and detached from the outer periphery of the elevating cylinder 15 raised from four positions of the reaction force receiving frame 13 of the tube rotating device 1. Four connecting steel pipes 31, a rectangular plate-like plate 32 having a through hole 32 a integrally coupled to these connecting steel pipes 31 and supported substantially horizontally and through which the joint tube 41 passes. A pair of support frames 33 integrally coupled along the short side of the upper surface of 32, and a stopper bar 34, which is a steel column having an H-shaped cross section raised upward from each support frame 33, is provided.

  Further, as attached to the upper cover 24, it is attached to the upper surface of the upper cover 24 (see FIG. 5), extends from the cylindrical casing 24b in the outer diameter direction, and is movable relative to the stopper bar 34 in the vertical direction. On the other hand, a cover rod 35 having a length engageable in the rotation direction is provided.

Next, the ground tool will be described.
In the present embodiment, a drilling bucket 51 shown in FIG. 1A and a bottom expansion bucket 52 shown in FIG. Both buckets 51 and 52 are respectively attached to the tip of the kelly bar 6 and inserted into the casing tube 4 for use.

  The drilling bucket 51 has a bottomed cylindrical shape, has a cutting blade and an opening at the bottom, and is well known to excavate the ground GR by rotating and simultaneously store excavated earth and sand inside the bucket.

  The widened bucket 52 has a widened blade that opens as it rotates in a set rotational direction (clockwise in the present embodiment), and is a well-known one that expands the diameter of a drilled hole.

  Next, as an operation of the first embodiment, a procedure for excavating the pile driving hole H shown in FIG. 1 using the excavating apparatus A of the first embodiment will be described.

First, using the tube rotating device 1 of the excavator A, the casing tube 4 is pushed down while rotating on the ground GR. Since this operation is the same as in the prior art, detailed description is omitted.
And if the casing tube 4 is pushed down, the earth and sand of the inner periphery of the casing tube 4 will be discharged | emitted next.

  For discharging the earth and sand, a hammer grab (not shown) or a drilling bucket 51 can be used as appropriate according to the state of the ground GR as in the prior art. The earth and sand discharging procedure used will be described.

When discharging the earth and sand using the drilling bucket 51, first, the joint tube 41 is connected to the upper end of the casing tube 4.
In parallel with this, the kelly bar 6 suspended by a crane (not shown) is passed through the sun gear 23 of the gearbox 2 and, as shown in FIG. Put on.

Next, the stopper mechanism 3 is installed in the tube rotating device 1.
That is, the stopper mechanism 3 is suspended by a crane (not shown) and the tube rotation is performed so that the four connecting steel pipes 31 of the stopper mechanism 3 are covered from the four lifting cylinders 15 of the tube rotating device 1. Install on the device 1.

Next, the kelly bar 6 suspended by a crane (not shown) is moved, and the drilling bucket 51 attached to the tip of the kelly bar 6 is inserted into the casing tube 4 from above, and the outer periphery of the kelly bar 6 is also inserted. The speed-up gear 2 attached to is placed on the joint tube 41 in an overlapping manner.
At this time, the pair of cover rods 35, 35 fixed to the upper cover 24 of the speed increaser 2 are positioned counterclockwise as viewed from above with respect to the stopper bars 34, 34 as shown in FIG. To place. Further, the position of the speed increasing device 2 in the rotational direction is adjusted so that the engaging rod 21 a protruding from the outer periphery of the speed increasing device 2 does not interfere with the flange 41 b of the engaging arm 41 a erected from the joint tube 41. Install.

  After the speed-up gear 2 is installed on the joint tube 41, the kelly bar 6 is further moved downward to lower the drilling bucket 51 and arrange it at the bottom of the hole H. At this time, the expansion / contraction mechanism of the Keriba 6 and the sun gear 23 are not locked.

  When the drilling bucket 51 reaches the bottom of the perforation H, the tube rotating device 1 is then driven to rotate the casing tube 4 forward. As the casing tube 4 rotates, the joint tube 41 rotates forward. First, the engagement arm 41a of the joint tube 41 and the engagement rod 21a of the speed increaser 2 are in the engaged state shown in FIG.

  Further, in the gear box 2, when the ring gear 21 is rotated forward, at the initial stage of rotation, a force that moves the upper and lower covers 24, 25 and the rotating shaft 26 in the rotating direction by the input to the carrier 22 acts. When 26 is moved (revolved), the speed increaser 2 is in an idle state, but from the time when the cover rod 35 coupled to the upper cover 24 contacts the stopper bar 34 and the movement of the rotary shaft 26 is restricted. The speed increaser 2 performs a speed increasing operation to rotate the sun gear 23 at a higher speed in the forward rotation direction.

  After the engagement arm 41a and the engagement rod 21a are engaged, the tube rotating device 1 is driven to push down the casing tube 4 while rotating it normally. As a result, the sun gear 23 is rotated forward, the sun gear 23 and the kelly bar 6 are locked, and the kelly bar 6 and the drilling bucket 51 are pushed down while rotating in the forward direction. Capture.

In this case, the drilling bucket 51 is rotated at a higher speed than the rotation speed of the casing tube 4 by the planetary gear mechanism 20, and the speed increasing ratio of the planetary gear mechanism 20 is the teeth of the gears 21 to 23. Based on the number, the rotation speed is set in advance so as to obtain the optimum rotation speed for the operation of the drilling bucket 51.
At this time, as the speed increaser 2 moves downward together with the casing tube 4, the cover rod 35 coupled to the upper cover 24 moves downward while maintaining a contact state along the stopper bar 34. To do. Therefore, the stopper bar 34 is formed in a vertical dimension in which the drilling bucket 51 can move relative to the cover rod 35 by an amount of vertical movement that can sufficiently take in the soil.

As described above, when the drilling bucket 51 moves while rotating and takes in the earth and sand, the driving of the tube rotating device 1 is stopped, and then the earth and sand taken in the drilling bucket 51 is discharged.
In this case, first, the tube rotating device 1 is rotated in the reverse direction to release the lock between the speed increaser 2 and the joint tube 41 and the lock between the Keriba 6 and the sun gear 23. Then, the kelly bar 6 and the drilling bucket 51 are pulled up. Further, as shown in FIG. 6, the speed increaser 2 is pulled up together with the drilling bucket 51, and the earth and sand taken into the drilling bucket 51 is discharged to the outside.

  By repeatedly performing the above operation, the casing tube 4 can be pushed down and the earth and sand discharged by the drilling bucket 51 can be discharged. In addition, with the repetition of this operation, the casing tube 4 performs an appropriate addition as in the conventional case.

Next, an operation in the case where the bottom end of the perforation H is widened using the bottomed bucket 52 will be described.
In this case, after the drilling bucket 51 is pulled up from the casing tube 4 as described above, the drilling bucket 51 at the lower end of the kelly bar 6 is removed and replaced with the expanded bucket 52.

  When using the widened bucket 52, before inserting the widened bucket 52 into the casing tube 4, the tube rotating device 1 is driven in reverse so that the casing tube 4 is in the widened position as shown in FIG. Pull up upwards.

  Thereafter, the same operation as the drilling bucket 51 is performed to move the bottom expansion bucket 52 to the bottom of the perforation H, and then the casing tube 4 is rotated forward by the tube rotating device 1 so that the bottom expansion bucket 52 opens the blade as illustrated. Thus, the diameter of the perforation H is expanded.

Even when the bottomed bucket 52 is used, after being pushed downward by a preset amount, the tube rotating device 1 is reversely rotated to unlock each lock, and then the bottomed bucket 52 and the kelly bar 6 are pulled up. .
In this way, when the formation of the perforations H is completed, reinforcing bars can be installed in the perforations H, and concrete can be placed to form a pile.

As described above, according to the excavator A of the present embodiment, the following effects are listed.
a) When the excavator A according to the first embodiment rotates the casing tube 4 by the tube rotating device 1, the ground such as the kelly bar 6 and the drilling bucket 51 and the bottomed bucket 52 attached thereto by the speed increaser 2. The tool is rotated and construction on the ground GR can be performed.
This eliminates the need for a base machine equipped with a crane device and a rotary drive device that suspends and rotates the kelly bar as in the past, enabling compact excavation while suppressing the size and height of the site required for construction. It becomes.

  b) Since the rotation of the casing tube 4 is accelerated by the gearbox 2 and transmitted to the ground tools such as the drilling bucket 51 and the bottom expansion bucket 52, without changing the rotation speed of the tube rotating device 1, It becomes possible to rotate the ground tool at the optimum rotation speed. Therefore, the existing tube rotating device 1 can be used as it is, and is excellent in versatility as compared with the one that changes the rotation speed of the tube rotating device 1.

c) The planetary gear mechanism 20 is used as a speed change mechanism, the rotation shaft 26 of the carrier 22 is fixed by the stopper mechanism 3 supported by the tube rotating device 1, and the rotation of the casing tube 4 is transmitted to the kelly bar 6 via the planetary gear mechanism 20. Since the speed increase is transmitted, the degree of freedom in setting the rotation output direction and the gear ratio to the kelly bar 6 and the ground tool is high. That is, the gear ratio of the planetary gear mechanism 20 can be changed depending on the ground tool, and the rotation direction of the kelly bar 6 is rotated not only in the same direction as the casing tube 4 but also in the reverse direction. It is also possible.
Therefore, the existing ground tool can be used as it is, and is excellent in versatility.
In addition, by using the planetary gear mechanism 20, the vertical dimension of the mechanism that performs rotation transmission can be suppressed. Thereby, the required space at the time of construction by a ground tool can be suppressed.

  d) The joint tube 41 is connected to the casing tube 4, an engagement mechanism including the engagement rod 21 a and the engagement arm 41 a is provided between the joint tube 41 and the ring gear 21, and the casing tube 4 is simply rotated. Engagement and disengagement with the planetary gear mechanism 20 are possible, and operation is simple. Further, by interposing the joint tube 41, the casing tube 4 can be used without being processed, and is excellent in versatility.

  e) The stopper mechanism 3 is mounted on the existing tube rotating device 1 and can be positioned and fixed by simply placing the connecting steel pipe 31 over the lifting cylinder 15 using the lifting cylinder 15. Therefore, it is not necessary to add a positioning and fixing mechanism, and the cost and weight can be reduced.

  f) The cover rod 35 is coupled to the upper cover 24 of the speed increaser 2 and is separate from the stopper bar 34 fixed to the tube rotating device 1 of the stopper mechanism 3 and can be moved relative to the vertical direction. The gearbox 6 can be moved together with the speed increaser 2 and the like, the work for discharging the earth and sand from the perforations H is easy, and the workability is excellent.

(Second Embodiment)
Next, a drilling device according to a second embodiment of the present invention will be described.
Since the second embodiment is a modification of the first embodiment, only differences from the first embodiment will be described, and the configuration common to both will be described in the first embodiment. The same reference numerals as those in the embodiment are attached and description thereof is omitted.

The excavator of the second embodiment is different from the first embodiment in the configuration of the planetary gear mechanism 220 of the speed increaser 200 as a speed change mechanism.
Below, the structure of the gearbox 200 in the excavator of 2nd Embodiment and the difference with 1st Embodiment are demonstrated based on FIG. 7, FIG.

In the first embodiment, the speed increaser 2 rotates the ring gear 21 and the sun gear 23 in the same direction, and increases the speed of the kelly bar 6 and the drilling bucket (ground tool) 51 in the same direction as the casing tube 4. It was made to rotate.
On the other hand, in the second embodiment, the speed increaser 200 rotates the ring gear 221 and the sun gear 223 in the opposite directions, and causes the kelly bar 6 and the drilling bucket (ground tool) 51 to rotate in the rotation direction of the casing tube 4. The speed is increased in the opposite direction.

  That is, a so-called single pinion type carrier 222 is interposed between a ring gear 221 that rotates integrally with the casing tube 4 by the tube rotating device 1 and a sun gear 223 that rotates integrally with the Kelly bar 6. 221 and the sun gear 223 rotate in opposite directions.

  Although the carrier 222 is a single pinion type, a small-diameter pinion gear 222 a and a large-diameter pinion gear 222 b are coaxially provided on the rotating shaft 226, and the sun gear 223 is rotated in reverse at an increased speed with respect to the ring gear 221. That is, as shown in FIG. 8, a pinion gear 222 a having a small diameter and a relatively small number of teeth arranged on the lower side of the rotating shaft 226 is meshed with the ring gear 221. A pinion gear 222b that is arranged on the upper side of the rotation shaft 226 and has a relatively large diameter and a large number of teeth relative to the pinion gear 222a is engaged with the sun gear 223.

  The sun gear 223 includes a cylindrical body 223b that penetrates the upper cover 224 and the lower cover 225 of the speed increaser 200 on the inner periphery. And in this cylindrical body 223b, the gear 223c is formed in the outer periphery only in the height which overlaps with the large-diameter pinion gear 222b in the direction orthogonal to the axis. A keyway 223a similar to that of the first embodiment is formed on the inner periphery of the cylindrical body 223b.

In the second embodiment described above, since the carrier 222 is restricted from revolving by the stopper mechanism 3 as in the first embodiment, the sun gear 223 rotates at an increased speed in reverse rotation relative to the ring gear 221. Is done.
Therefore, in the excavator of the second embodiment, the drilling bucket 51 rotates at an increased speed in the opposite direction with respect to the casing tube 4 during excavation.
In this case, as the casing tube 4 rotates, the soil in the casing tube 4 is rotated in the same direction as the casing tube 4, while the drilling bucket 51 excavating the soil is opposite to the direction of rotation of the soil. Rotate in the direction. Thereby, in 2nd Embodiment, compared with what rotates the drilling bucket 51 in the same direction as the casing tube 4, excavation efficiency improves.

In the second embodiment, the carrier 222 has a small-diameter pinion gear 222a that meshes with the ring gear 221 and a large-diameter pinion that meshes with the sun gear 223 when the sun gear 223 is interposed so as to rotate reversely with the ring gear 221. The gear 222b is provided coaxially.
For this reason, the carrier 222 has a higher degree of freedom in setting the speed increase ratio (transmission ratio) as compared with the carrier 222 having one pinion gear that meshes with both the ring gear 221 and the sun gear 223. Thereby, the setting of the speed increasing ratio excellent in the excavation efficiency of the drilling bucket 51 becomes easy.

  The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment or example, and the design changes are within the scope of the present invention. Are included in the present invention.

  For example, in the embodiment, a drilling bucket and a bottom expansion bucket as a soil removal device are shown as construction tools, but not limited to this, and connected to a kelly bar to perform construction on the ground in a casing tube If so, a tool other than the earth removing device (for example, a stirring blade for ground improvement or a tool having only a bottom expanding function) may be used.

In the embodiment, the planetary gear mechanism is shown as the rotation transmission mechanism. However, as the rotation transmission mechanism, any belt or chain other than the planetary gear mechanism can be used as long as it transmits rotation from the casing tube to the Keriba. A well-known rotation transmission structure in which rods, pulleys, and the like are combined may be used. For example, in the embodiment, rotation transmission between the pinion gear and the sun gear can be performed by a chain, a belt pulley, or the like.
In addition, a planetary gear mechanism that transmits gears while transmitting the rotation from the casing tube to the Keriba is used for the rotation transmission mechanism. However, the gear ratio may be an appropriate gear ratio as appropriate according to the ground tool. At the same time, constant-speed rotation transmission may be performed. That is, the rotation transmission mechanism is not limited to one that accelerates the rotation of the casing tube and transmits the rotation to the kelly bar as shown in the embodiment, and a mechanism that transmits the rotation at a reduced speed may be used depending on the ground tool. In particular, in the case where the casing tube and the ground tool rotate in the opposite direction as in the second embodiment, even when the ground tool is rotated at a constant speed or decelerated with respect to the casing tube, it is efficient. Construction is possible.

  Further, in the first embodiment, the carrier is shown in which two pinion gears are interposed in series between the ring gear and the sun gear. However, the number of pinion gears in the carrier is different from that in the embodiment. It is not limited to what is shown. For example, three or more pinion gears may be interposed in series. Alternatively, in the second embodiment, a carrier in which one pinion gear is engaged with both the ring gear and the sun gear may be used. Also in this case, the sun gear can be rotated in the reverse direction at an increased speed relative to the ring gear.

1 Tube rotating device 2 Speed up gear (transmission mechanism)
3 Stopper mechanism 4 Casing tube 6 Keriba 20 Planetary gear mechanism 21 Ring gear 21a Engagement rod (engagement mechanism)
22 Carrier 23 Sun gear 26 Rotating shaft 41 Joint tube 41a Engaging arm (engaging mechanism)
41b collar (engagement mechanism)
51 Drilling bucket (ground tool)
52 Expanded bottom bucket (ground tool)
A Drilling device GR Ground H Drilling

Claims (5)

A drilling rig equipped with a tube rotating device that pushes down while rotating the casing tube to the ground,
A ground tool that can be inserted into the casing tube and is connected to the tip of a shaft-shaped kelly bar and can be ground by rotation,
A rotation transmission mechanism coupled to the casing tube and capable of transmitting the rotation of the casing tube to the kelly bar inserted into the casing tube;
Bei to give a,
The rotation transmission mechanism includes a planetary gear mechanism having a ring gear connected to the casing tube, a sun gear through which the kelly bar is inserted so as to be able to transmit rotation, and a carrier that transmits the rotation of the ring gear to the sun gear. Prepared,
The excavator characterized by the stopper mechanism which controls the revolution of the said carrier being supported by the said tube rotation apparatus.   The excavator according to claim 1, wherein the rotation transmission mechanism is a transmission mechanism that transmits the rotation speed of the casing tube to the Kelly bar while changing the rotation speed. 3. The excavator according to claim 1 , wherein the planetary gear mechanism has a structure in which a rotation direction of the planetary gear mechanism is reversed to a rotation direction of the ring gear. A joint tube for connection with the ring gear, which can be connected to the upper end of the casing tube, is provided.
An engagement mechanism is provided between the joint tube and the ring gear to engage in the rotational direction and the axial direction during forward rotation, which is the rotational direction when the casing tube is pushed down, and to disengage the engagement during reverse rotation. The excavator according to any one of claims 1 to 3 , wherein the excavator is provided. The stopper mechanism is
A stopper bar raised upward from the tube rotating device;
A rotation shaft that rotatably supports the pinion gear of the carrier is attached to the upper surface of the fixed upper cover, and is movable relative to the stopper bar in the vertical direction while having a length that can be engaged in the rotation direction. The excavator according to any one of claims 1 to 4, wherein the excavator is provided with a cover rod.