JP2012012839A - Bucket type boring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring device that makes rotation of a bucket independent from rotation of a casing to efficiently perform excavation and in-take of earth and sand.SOLUTION: In a boring device, a bucket 2 supported on a support frame 8 is accommodated in a casing 1, and a pad 19 at the tip of a gripper arm 18 mounted on the support frame 8 is pressed by hydraulic pressure to fix the support frame 8 onto an inner peripheral surface of the casing 1. With the casing 1 being rotated and pressed in, the bucket 2 is rotated at larger rotating speed than that of the casing 1 in a direction opposite to a rotating direction of the casing 1 by a hydraulic motor mounted on the support frame 8 to excavate a hole bottom portion and take in earth and sand. Hydraulic pressure supply to the support frame 8 side is performed via an auxiliary machine receiving base 9 mounted at an upper end face of the casing 1.

Description

  The present invention relates to a drilling method for excavating (discharging) earth and sand in a casing press-fitted (penetrated) into the ground while excavating with a bucket during construction by a cast-in-place pile method such as an earth drill method, and the drilling thereof The present invention relates to a bucket type drilling device suitable for the method.

  In the cast-in-place pile construction such as the earth drill method, for example, as excavation by an all-swivel all-casing excavator, the casing (casing tube) is pressed into the ground while rotating, and the casing accommodated in the casing is also placed in the casing. The rotational force is transmitted, and the earth and sand excavated by the bucket rotating with the casing is taken into the bucket and then discharged (soiled).

  And the thing of patent document 1 and patent document 2 is proposed as a bucket suitable for such excavation. In the technologies described in Patent Literature 1 and Patent Literature 2, the rotational force of the casing is used for rotating the bucket, and the bucket is rotated in the direction opposite to the casing in synchronization with the rotation of the casing.

Japanese Utility Model Publication No. 4-9436 Japanese Utility Model Publication No. 8-1470

  However, in the techniques described in Patent Document 1 and Patent Document 2, since the rotational force of the casing is used for the rotation of the bucket, the rotation of the bucket is necessarily completely synchronized with the rotation of the casing. Efficient excavation and soil uptake will not be possible.

  The present invention has been made paying attention to such a problem, and in particular, by making the rotation of the bucket independent of the rotation of the casing, a drilling device that further improves the efficiency of excavation and sediment acquisition. It is to provide.

  According to a first aspect of the present invention, there is provided a drilling method in which a bucket is accommodated in a casing press-fitted into the ground and the bottom of the casing is excavated by rotating the bucket, and the casing is rotated. In parallel with the press-fitting, the bucket is rotated by an independent bucket driving means in a direction opposite to the rotation direction of the casing and at a rotation speed larger than the rotation speed of the casing.

  In this case, it is desirable that the bucket driving means is accommodated and disposed in the casing together with the bucket, and the bucket supporting means for rotatably supporting the bucket is provided on the inner peripheral surface of the casing as described in claim 2. After fixing, the bucket is driven to rotate by bucket drive means mounted on the bucket support means.

  According to a third aspect of the present invention, the bucket support means is fixed to the inner peripheral surface of the casing by gripper means mounted on the bucket support means.

  More specifically, as described in claim 4, in a drilling method in which a bucket is accommodated in a casing press-fitted into the ground and the bottom of the casing is excavated by rotating the bucket. Suspending the bucket supporting means for rotatably supporting the bucket in the casing together with the bucket, and landing the bucket on the bottom of the hole; and bucket supporting means for supporting the bottomed bucket In parallel with the step of fixing to the inner peripheral surface of the casing by the gripper means mounted on the support means and the press-fitting while rotating the casing, the bucket drive means mounted on the bucket support means By rotating in a direction opposite to the rotation direction of the casing and at a rotation speed larger than the rotation speed of the casing. The step of taking in the bucket while excavating and releasing the fixation of the bucket support means to the inner peripheral surface of the casing, and then carrying out the bucket after taking in the sand together with the bucket support means to the outside of the casing and the earth and sand in the bucket And a step of discharging the soil.

  The invention according to claim 5 captures the above-mentioned drilling technique as a drilling device, and accommodates and arranges a bucket in a casing press-fitted into the ground, and press-fits while rotating the casing. In the bucket type drilling device that excavates the bottom of the hole of the casing by rotating the bucket, the bucket support means that is suspended and supported by the rope body, and is rotatably supported by the bucket support means. A bucket housed and disposed in the casing together with the bucket support means, a gripper means mounted on the bucket support means for controlling and releasing the bucket support means with respect to the inner peripheral surface of the casing, and the bucket support means. The bucket is rotated in the direction opposite to the casing rotation direction and at a rotation speed greater than the casing rotation speed. Characterized in that it comprises a bucket driving means that, the.

  The gripper means and the bucket drive means are both hydraulic, as described in claim 6, for example.

  When both the gripper means and the bucket driving means are hydraulic, for example, the hydraulic relay means according to claim 7 is used in combination so that the hydraulic hose or the like does not hinder the work. That is, the invention described in claim 7 has a hydraulic relay means mounted on the upper end of the casing, and when the bucket support means is lifted from the casing, the hydraulic relay means is placed on the bucket support means. While lifting the means with the means mounted, when the bucket support means is suspended in the casing, the bucket support means is lowered independently after the hydraulic relay means is transferred to the upper end of the casing. It is characterized by that.

  In this case, the hydraulic relay means controls winding and unwinding of the hydraulic hose connecting the hydraulic relay means, the hydraulic gripper means and the bucket driving means, respectively, as described in claim 8. It shall be equipped with a hose reel unit.

  According to a ninth aspect of the present invention, on the premise of the bucket type drilling device according to any one of the fifth to eighth aspects, the bucket support means is suspended and supported by a crane-type mother machine via a rope. It is clarified that

  Further, in order to efficiently perform soil uptake and soil removal into the bucket, as described in claim 10, the bucket has an excavating blade and an opening for taking up soil in the bottom lid, It is desirable that the bottom lid itself can be opened and closed.

  Therefore, in at least the invention described in claim 1, the rotation of the bucket, excavation based on it, and the intake of earth and sand do not depend on the rotation of the casing, and at least the setting of the rotation start and rotation stop timing and the rotation speed setting of the bucket By performing independently without depending on the rotation of the casing, efficient excavation and soil uptake can be performed.

  According to the first and fifth aspects of the present invention, the rotation of the bucket is performed independently by the independent bucket driving means without depending on the rotation of the casing. The speed can be arbitrarily set, and thereby efficient excavation and sediment collection can be performed, and workability is improved.

  According to the eighth aspect of the present invention, the hydraulic gripper means and the bucket drive means have the hydraulic relay means, and the hydraulic relay means has a hose reel unit for taking up and feeding the hydraulic hose. Therefore, the handling performance of the hydraulic hose becomes favorable, and the handling of the hydraulic hose does not hinder the work, and the workability is further improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows more concrete 1st Embodiment of the bucket type drilling apparatus which concerns on this invention, Comprising: The whole schematic explanatory drawing. The front view which shows the detail of the bucket which makes the main element in the bucket type drilling apparatus of FIG. 1, and a support frame. The top view of FIG. The right view of FIG. Sectional drawing which follows the AA line of FIG. Sectional drawing which follows the BB line of FIG. Sectional drawing which follows the CC line | wire of FIG. Sectional drawing which follows the DD line | wire of FIG. The expanded explanatory view which shows the state when the bucket is thrown in in the casing from the state of FIG. It is a figure which shows the hole-drilling procedure by the hole-drilling apparatus shown in FIG. 1, (A) is explanatory drawing which shows the state which has lifted the auxiliary device stand with a support frame and a bucket, (B) is casing a bucket with a support frame. Explanatory drawing which shows the state suspended in the inside. FIGS. 2A and 2B are diagrams illustrating a drilling procedure performed by the drilling apparatus illustrated in FIG. 1, in which FIG. 1A is an explanatory diagram illustrating a state in which a support frame is fixed in a casing, and FIG. FIG. It is a figure which shows the drilling procedure by the drilling apparatus shown in FIG. 1, (A) is explanatory drawing which shows the state which lifted the bucket from the state of (B) of FIG. 11, (B) opens the bottom cover of a bucket Explanatory drawing when dumping.

  1 and the following drawings are diagrams showing a more specific embodiment of a drilling method and a bucket type drilling apparatus according to the present invention, and FIG. 1 shows an overall outline of the bucket type drilling apparatus, and FIG. -8 show the details of the bucket 2 in FIG. Further, FIGS. 10 to 12 show a drilling procedure in the bucket type drilling apparatus shown in FIG.

  As shown in FIG. 1, in a bucket drilling device (hereinafter simply referred to as a drilling device) according to the present embodiment, a steel pipe casing (casing) having a predetermined diameter that is press-fitted into the ground from the ground surface. 1) and a bucket 2 that is put into the casing 1 to excavate and take in the sediment at the bottom of the hole of the casing 1 and to discharge or unload the soil to the outside of the casing 1; In connection with them, on the ground surface G side, an all-swivel all-casing excavator (hereinafter simply referred to as an excavator) 3 and a suspension base machine (base machine) for the bucket 2 are provided. As a crawler crane (hereinafter simply referred to as a crane) 4 is prepared.

  As is well known, the excavator 3 has a function of gripping the outer peripheral surface of the casing 1 with a gripper (not shown) and rotating (turning) the casing 1 and a function of press-fitting the rotating casing 1 into the ground (hydraulic pressure). Jack function). A plurality of cutter bits 5 (see FIG. 9) are attached to the lower end of the casing 1, and the casing 1 is finally press-fitted to a predetermined depth by adding tube segments several times during press-fitting. .

  On the other hand, the bucket 2 is suspended and supported by the boom 6 of the crane 4 via a wire (auxiliary winding wire) 7 that is a rope body. More specifically, as will be described later, a support frame 8 as a bucket support means is directly suspended and supported by a wire 7, and the bucket 2 is vertically centered with respect to the support frame 8. It is supported so that it can rotate around. Further, in the present embodiment, as will be described later, when the bucket 2 is put into the casing 1 together with the support frame 8, an auxiliary device cradle 9 as a hydraulic relay means mounted on the upper end of the casing 1 is provided. In contrast, when the bucket 2 is lifted together with the support frame 8 as shown in FIG. 1, the auxiliary cradle 9 is placed on the support frame 8 as shown in FIG. They are designed to be lifted together.

  Note that a connecting wire 11 is connected to the tip of the wire 7 via a swivel 10, and this connecting wire 11 is connected to a support frame 8 described later.

  2 to 8 are views showing details of the bucket 2 including the support frame 8, FIG. 2 is a front view thereof, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is a right side view of FIG. ing. 5 to 8 show cross-sectional views taken along lines AA, BB, CC, and DD in FIG.

  As shown in FIGS. 2 to 4, the support frame 8 is formed by connecting a flat cylindrical gear box portion 13 as well as a cylindrical upper box portion 12 via a prismatic intermediate post 14. A guide post 15 having a tapered tip that also serves as a suspension support is connected to the upper surface of the bracket 12 by a bracket 16, and the connecting wire 11 described above is connected to the guide post 15. . As shown in FIG. 5, four stabilizers 17 having the same protruding length are mounted radially at the quadrant position on the outer peripheral surface of the cylinder in the upper box portion 12, and the tips of these stabilizers 17 are drawn. The diameter of the locus is set to be slightly smaller than the inner diameter of the casing 1. As will be described later, the stabilizer 17 functions as a guide when the bucket 2 is put together with the support frame 8 into the casing 1, and has a steadying function and a centering function.

  Further, as shown in FIG. 6, four gripper arms 18 having the same protruding length are mounted radially on each surface of the prismatic intermediate post 14 as in the case of the stabilizer 17. In FIG. 4, the gripper arm 18 is not shown in order to avoid complication of the drawing. At the tip of each gripper arm 18, a plate-like pad 19 having a large coefficient of friction that functions as a reaction force receiver from the casing 1 and a hydraulic cylinder 20 that presses the pad 19 outward are provided. Then, by pressing each pad 19 against the inner peripheral surface of the casing 1 by the pressing operation of the hydraulic cylinder 20, the support frame 8 can be fixed to the inner peripheral surface of the casing 1 with the frictional force of the pad 19. Therefore, these four gripper arms 18 including the pad 19 and the hydraulic cylinder 20 form gripper means for fixing the support frame 8 to the inner peripheral surface of the casing 1.

  As shown in FIG. 6, the gear box portion 13 supports an upper bracket 22 (see FIG. 7) of the bucket 2 via a bearing 21 so as to be rotatable about a vertical axis. A large-diameter driven gear 23 is connected to the gear box 13 in the gear box 13. Further, the same four hydraulic motors 24 as the bucket driving means are erected downward at the quadrant position on the upper surface of the gear box portion 13 so as not to interfere with the gripper arm 18. In FIG. 2, the hydraulic motor 24 is not shown in order to avoid complication of the drawing.

  A small-diameter drive gear 25 is connected to the output shaft of each hydraulic motor 24 in the gear box portion 13, and each drive gear 25 is meshed with a large-diameter driven gear 23. Therefore, the bucket 2 can be driven to rotate with respect to the support frame 8 via the drive gear 25 and the driven gear 23 by simultaneously starting the four hydraulic motors 24.

  The bucket 2 is composed of a hollow cylindrical bucket body 26 and a bottom lid 27 attached to the lower surface of the bucket body 26 so as to be openable and closable. The diameter is set to a size that can be accommodated in the casing 1. As shown in FIGS. 2, 4, and 8, the bottom lid 27 has a substantially conical shallow dish shape, and a part of the bottom lid 27 can be opened and closed (rotatable) at the lower end opening edge of the bucket body 26 by a hinge 28. A lid locking mechanism 29 is provided at a position opposite to the hinge 28 in the lower end opening edge of the bucket body 26 while being connected.

  The lid lock mechanism 29 is attached to the inner peripheral surface of the bucket body 26 via a bracket 30, and is attached to the inside of the operation lever 31 having the handle portion 31 a at the upper end and the bottom lid 27, and the lower end of the operation lever 31. And a lock plate 32 having a slot that can be engaged. Then, if the operating lever 31 is rotated about its axis and the lock pin 31b is engaged with the lock plate 32, the bottom cover 27 can be kept closed by being locked. If the locking of the lock pin 31b with respect to the lock plate 32 is released by the reverse rotation operation, the bottom cover 27 is unlocked and the bottom cover 27 can be opened.

  In addition, as shown in FIG. 8, the bottom cover 27 has its inner surface reinforced by a plurality of reinforcing ribs 33, and earth and sand intake ports 34 are formed at two locations in the diameter direction. A bit 35 serving as a scraper is attached to the opening edge of the mouth 34. As will be described later, in the present embodiment, when the casing 1 is rotated to the right, for example, the bucket 2 is assumed to be rotated counterclockwise in the opposite direction. The shape and the direction of the bit 35 are determined in consideration of the rotation direction of the bucket 2.

  Here, the support frame 8 supporting the bucket 2 includes a hydraulic cylinder 20 and a hydraulic motor 24 as actuators, and hydraulic hoses 36 and 37 for supplying hydraulic pressure from the ground surface G side (see FIG. 9). In addition, a hydraulic control device such as a solenoid valve is essential. Therefore, the upper box portion 12 also serves as a waterproof box for accommodating hydraulic control devices such as those solenoid valves.

  According to the bucket 2 configured as described above, the support frame 8 and the support frame 8 are put into the casing 1 and are attached to the bottom of the hole, and then the pad 19 at the tip of the gripper arm 18 is pushed out so that the inner periphery of the casing 1 is By pressing the surface, the support frame 8 is fixed to the inner peripheral surface of the casing 1 with the frictional force generated by the pressure contact. Therefore, when the casing 1 is rotated, for example, by rotating clockwise, the support frame 8 rotates together with the casing 1 while supporting the bucket 2.

  At this time, the bucket 2 is driven to rotate in the direction opposite to the casing 1 by the hydraulic motor 24, that is, when the casing 1 is rotating clockwise, and the rotation speed of the casing 1 is rotated. It is assumed that the bucket 2 is rotationally driven at a higher speed.

  The lowering of the bucket 2 is performed integrally with the casing 1 by press-fitting the casing 1 depending on the press-fitting operation of the casing 1.

  By doing so, the sediment at the bottom of the hole in the casing 1 is efficiently taken into the bucket 2 from the sediment intake port 34 on the bottom lid 27 side in a short time while being excavated.

  In this case, since the rotation of the bucket 2 is performed by the independent hydraulic motor 24 regardless of the rotation of the casing 1, the timing for starting and stopping the rotation of the bucket 2 is not necessarily completely the same as the rotation of the casing 1. It is not necessary to synchronize, and the rotation start timing and rotation stop timing of the bucket 2 can be arbitrarily set together with the rotation speed of the bucket 2.

  However, as described above, since the lowering operation of the bucket 2 depends on the press-fitting operation of the casing 1, at least during the continuous press-fitting operation of the casing 1, the bucket 2 is also continuously and the rotational speed of the casing 1. Rotating at a higher speed is desirable for efficient excavation and sediment uptake.

  Here, FIG. 9 shows a state in which the bucket 2 is suspended in the casing 1 together with the support frame 8. As described above, the support frame 8 employs the hydraulic cylinder 20 and the hydraulic motor 24 as actuators, and supplies hydraulic pressure to the hydraulic cylinder 20 and the hydraulic motor 24 from the ground surface G side. In addition, since independent hydraulic hoses 36 and 37 are attached to each of the hydraulic cylinder 20 and the hydraulic motor 24, it is necessary to consider that the handling of the hydraulic hoses 36 and 37 does not hinder the original work. is there. In addition, although the power supply cable is attached separately from the hydraulic hoses 36 and 37, since the power supply cable is bundled together with the hydraulic hoses 36 or 37, only the hydraulic hoses 36 and 37 are focused here. Shall.

  In the present embodiment, since the hydraulic pressure is supplied from the crane 4 side shown in FIG. 1 to the support frame 8 side, an auxiliary device cradle 9 is employed as the hydraulic relay means. 9 is detachably mounted on the upper end of the casing 1, and the hydraulic pressure is supplied to the support frame 8 side introduced into the casing 1 via the auxiliary device cradle 9. .

  As shown in FIG. 9, the auxiliary device cradle 9 has a circular base 40 having a mounting guide 40 a on the lower surface as a main element, and can be stably maintained in its posture simply by being placed on the upper end surface of the casing 1. It has a structure.

  A guide sleeve 41 that can receive the above-described guide post 15 (see FIG. 2) on the support frame 8 side is erected at the center of the upper surface of the base 40, and the guide sleeve 41 opens at the lower surface of the base 40. is doing. Then, as will be described later, when the auxiliary device support 9 is lifted up by the support frame 8 and the auxiliary device support 9 is lifted together with the support frame 8 as shown in FIG. 15 is received by the guide sleeve 41 and the change of the posture of the auxiliary device base 9 with respect to the support frame 8 is regulated together with the relative positioning of the two.

  At the upper end of the guide sleeve 41 is mounted a center swivel 43 to which a source pressure side hydraulic hose 42 extending from the crane 4 side is fixed. A center swivel lock bar 44 extends from the center swivel 43 in the horizontal direction. . On the other hand, a guide post 45 for center swivel lock is erected on the excavator 3 side, and when the auxiliary equipment base 9 mounted on the upper end surface of the casing 1 rotates together with the casing 1, as will be described later, An anti-rotation function is exhibited by bringing the swivel lock bar 44 into contact with the center swivel lock guide post 45. In this way, as long as the center swivel lock bar 44 is within the height range of the center swivel lock guide post 45, useless movement of the source pressure side hydraulic hose 42 is restricted.

  A pair of independent hydraulic hose reel units 46 and 47 are mounted on the upper surface of the base 40 for each of the hydraulic hoses 36 and 37. The hydraulic pressure from the source pressure side hydraulic hose 42 is distributed to the hydraulic hoses 36 and 37, and the hydraulic hoses 36 and 37 to which the hydraulic pressure is distributed are wound around the independent hydraulic hose reel units 46 and 47, respectively. ing. The hydraulic hose reel units 46 and 47 have a known structure in which an appropriate winding force by a spring or the like is always applied to the hose reel itself.

  As shown in FIG. 9, when the bucket 2 is lowered together with the support frame 8, the hydraulic hoses 36 and 37 are smoothly pulled out from the respective hydraulic hose reel units 46 and 47 without being loosened. When the bucket 2 is lifted together with the support frame 8 and approaches the auxiliary device cradle 9, the hydraulic hoses 36 and 37 are smoothly wound around the hydraulic hose reel units 46 and 47 accordingly. That is, each hydraulic hose reel unit 46, 47 has a function of adjusting the feeding length of each hydraulic hose 36, 37 according to the approaching / separating operation of the support frame 8 with respect to the auxiliary device base 9.

  A series of movements of the bucket drilling device configured as described above will be described as follows.

  FIG. 10A shows the same state as FIG. 1, and as shown in FIG. 10, the support frame 8 suspended and supported by the wire 7 supports the bucket 2 on the lower side. At the same time, the auxiliary device cradle 9 is mounted and lifted on the upper side, and is positioned directly above the casing 1. In this state, as described above, the guide post 15 (see FIG. 2) on the support frame 8 side is inserted into the guide sleeve 41 (see FIG. 9) on the auxiliary device cradle 9 side. The posture change of the auxiliary device cradle 9 with respect to 8 is regulated, and the auxiliary device cradle 9 stably maintains the posture of FIG. Further, most of the hydraulic hoses 36 and 37 attached to the support frame 8 are wound around the hydraulic hose reel units 46 and 47, and the pad 19 at the tip of the gripper arm 18 shown in FIG. is doing.

  The support frame 8 is lowered from the state of FIG. 10A so as to be hung slowly, and the bucket 2 is inserted into the casing 1 together with the support frame 8. When the auxiliary device cradle 9 is seated on the upper end surface of the casing 1 in the descending process, the auxiliary device cradle 9 is transferred and installed on the upper end surface of the casing 1 as shown in FIG. In this case, the weight of the auxiliary cradle 9 is not loaded on the support frame 8.

  After the auxiliary device cradle 9 is transferred and installed on the upper end surface of the casing 1, when the bucket 2 is lowered to slowly hang down together with the support frame 8, the hydraulic hoses 36 and 37 are gradually moved to the hydraulic hose. As shown in FIG. 10 (B), the bucket 2 is finally delivered from the reel units 46 and 47, and finally reaches the bottom of the hole of the casing 1. In the process in which the bucket 2 descends in the casing 1 together with the support frame 8, the stabilizer 17 and the gripper arm 18 shown in FIG.

  When the bucket 2 reaches the bottom of the hole of the casing 1, the pad 19 at the tip of the gripper arm 18 attached to the support frame 8 is placed on the inner peripheral surface of the casing 1 as shown in FIG. Press. More specifically, the pad 19 at the tip of each gripper arm 18 shown in FIG. 2 is pushed out by the hydraulic cylinder 20 and is brought into strong pressure contact with the inner peripheral surface of the casing 1 to maintain that state. As a result, the entire support frame 8 is fixed to the casing 1 by the frictional force between the inner peripheral surface of the casing 1 and the pad 19, and the support frame 8 and the bucket 2 are kept concentric with the casing 1. At this time, the bottom cover 27 of the bucket 2 is kept closed.

  When the support frame 8 is fixed to the casing 1 in this way, as shown in FIG. 11B, the casing 1 is rotated at a predetermined speed by the activation of the excavator 3, and is press-fitted into the ground with a predetermined thrust. At the same time, the hydraulic motor 24 (see FIG. 4) on the support frame 8 side is simultaneously activated to rotate the bucket 2 at a rotational speed greater than that of the casing 1.

  In this case, the rotation direction of the bucket 2 is opposite to the rotation direction of the casing 1. For example, when the casing 1 is rotated to the right, the bucket 2 is rotated counterclockwise at a higher rotation speed than the casing 1. Shall. That is, the support frame 8 fixedly supported on the inner peripheral surface of the casing 1 by the frictional force of the pad 19 rotates in the same direction as the casing 1, but the bucket 2 supported by the support frame 8 is Forcibly rotate in the reverse direction at a rotational speed greater than that of the casing 1 to ensure as large as possible a relative rotational speed difference between the casing 1 and the bucket 2.

  In addition, the auxiliary device base 9 mounted on the upper end surface of the casing 1 rotates together with the casing 1, and a part of the center swivel lock bar 44 and the center swivel lock guide post 45 described above are provided. The contact of the source pressure side hydraulic hose 42 and the like is prevented because of the contact.

  Then, due to the relative rotational speed difference and the press-fitting stroke of the casing 1, earth and sand at the bottom of the casing 1 are excavated and moved from the opening 34 (see FIG. 8) of the bottom cover 27 of the bucket 2 to the inside of the bucket 2. It will be taken in smoothly.

  If the bucket 2 supported by the support frame 8 can move together with the casing 1 by a predetermined amount, for example, about 1.5 m, which is substantially equal to the total height of the bucket 2, the rotation of the bucket 2 is stopped along with the rotation stop and press-fitting stop of the casing 1. Let Further, the pad 19 at the tip of the gripper arm 18 is also retracted to release the support frame 8 from being fixed to the inner peripheral surface of the casing 1.

  Here, as described above, since the rotation of the bucket 2 is performed by the independent hydraulic motor 24 regardless of the rotation of the casing 1, the timing of the rotation start and the rotation stop of the bucket 2 is not necessarily limited. It is not necessary to completely synchronize with the rotation of the casing 1, and the rotation start and stop timings of the bucket 2 can be arbitrarily set together with the rotation speed of the bucket 2.

  Then, the bucket 2 containing the earth and sand is slowly lifted together with the support frame 8 and carried out of the casing 1 to unload the earth and sand in the bucket 2, and the remaining soil is accumulated as shown in FIG. Move to the field. In the lifting process of the bucket 2 as described above, the hydraulic hoses 36 and 37 are sequentially wound around the hydraulic hose reel units 46 and 47, while the support frame 8 is an auxiliary device that has been mounted on the upper end surface of the casing 1 until then. The cradle 9 is lifted up and lifted together.

  Thereafter, as shown in FIG. 11B, the height of the bucket 2 is adjusted in the remaining soil accumulation field, and then the bottom cover 27 of the bucket 2 is opened by the operation lever 31 (see FIG. 4). Is opened, and the earth and sand in the bucket 2 is discharged.

  When the earth removal is completed, the bottom lid 27 is closed, and thereafter, the operations after (A) in FIG. 10 are repeated.

  As described above, according to the present embodiment, excavation and uptake of sediment by the bucket 2 can be performed very efficiently, and the earthing (discharging) to the outside of the casing 1 can be efficiently performed. There are advantages to list.

  (1) It can be easily applied to underwater excavation, and even in that case, the work efficiency is hardly changed.

(2) The work time can be shortened by increasing the efficiency of excavation and sediment collection, and CO ₂ can be reduced.

  (3) Since hydraulic power is basically used as power, it is possible to work with a so-called rough terrain crane.

  (4) The crane operator's skill is not required for excavation by the bucket and for taking up sediment.

DESCRIPTION OF SYMBOLS 1 ... Casing 2 ... Bucket 3 ... Full swing type all casing excavator 4 ... Crawler crane (hanging mother machine)
7 ... Wire (strand body)
8 ... Support frame (bucket support means)
9 ... Auxiliary cradle (hydraulic relay means)
18 ... Gripper arm (gripper means)
19 ... Pad (gripper means)
20 ... Hydraulic cylinder (gripper means)
24 ... Hydraulic motor (bucket drive means)
26 ... Bucket body 27 ... Bottom cover 36 ... Hydraulic hose 37 ... Hydraulic hose 46 ... Hydraulic hose reel unit 47 ... Hydraulic hose reel unit

The present invention is a bucket type suitable for a drilling method suitable for excavation (soil removal) while excavating the earth and sand in a casing press-fitted (penetrated) into the ground during construction by a cast-in-place pile method such as the all casing method The present invention relates to a drilling device.

In cast-in-place pile construction such as the all- casing construction method, for example, as excavation by an all-swivel all-casing excavator, the casing (casing tube) is pressed into the ground while rotating the casing, and the casing is also rotated in the bucket accommodated in the casing. The force is transmitted, and the earth and sand excavated by the bucket rotating together with the casing is taken into the bucket and then discharged (soiled).

According to the first aspect of the present invention, the bucket is accommodated in the casing press-fitted into the ground, and the bucket bottom is excavated by rotating the bucket in parallel with the press-fitting while rotating the casing. In the bucket drilling device, the bucket support means that is suspended and supported by the rope body, the bucket that is rotatably supported by the bucket support means, and accommodated in the casing together with the bucket support means, Mounted on the bucket support means, gripper means for fixing and releasing the bucket support means with respect to the inner peripheral surface of the casing, and mounted on the bucket support means, the bucket is disposed in a direction opposite to the rotation direction of the casing and and hydraulic bucket driving means for rotating at a high rotational speed than the rotational speed of the casing, the casing It has a hydraulic relay means to be mounted to the end, the. When the bucket support means is lifted from the casing, it is lifted with the hydraulic relay means mounted on the bucket support means, while when the bucket support means is suspended in the casing, After the hydraulic relay means is transferred to the upper end of the casing, the bucket support means is lowered alone .

It said gripper means shall hydraulic as described, for example, with in claim 2 bucket driving means.

The hydraulic relay means is employed so that hydraulic hoses attached to the bucket driving means and the gripper means do not obstruct the work.

In this case, the hydraulic relay means controls winding and unwinding of the hydraulic hose connecting the hydraulic relay means, the hydraulic gripper means, and the bucket driving means, respectively, as described in claim 3. It shall be equipped with a hose reel unit.

According to a fourth aspect of the present invention, on the premise of the bucket type drilling device according to any one of the first to third aspects, the bucket support means is suspended and supported by a crane type mother machine via a rope body. It is clarified that

Further, in order to efficiently perform soil uptake and soil removal into the bucket, as described in claim 5, the bucket has an excavation blade and an opening for taking up soil in the bottom cover, It is desirable that the bottom lid itself can be opened and closed.

According to the first aspect of the present invention, the rotation of the bucket is performed independently by the independent bucket driving means without depending on the rotation of the casing. It is possible to set arbitrarily, whereby efficient excavation and sediment collection can be performed, and workability is improved.

According to the invention described in claim 3 , the hydraulic gripper means and the bucket driving means have the hydraulic relay means, and the hydraulic relay means has a hose reel unit for taking up and feeding the hydraulic hose. Therefore, the handling performance of the hydraulic hose becomes favorable, and the handling of the hydraulic hose does not hinder the work, and the workability is further improved.

1 and the following drawings are diagrams showing a more specific embodiment of the bucket type drilling apparatus according to the present invention, FIG. 1 shows an outline of the entire bucket type drilling apparatus, and FIGS. The details of bucket 2 in FIG. Further, FIGS. 10 to 12 show a drilling procedure in the bucket type drilling apparatus shown in FIG.

Claims (10)

In the drilling method in which the bucket is accommodated in the casing press-fitted into the ground, and the bottom of the casing is excavated by rotating the bucket,
In parallel with the press-fitting while rotating the casing, the bucket is rotated by an independent bucket driving means in a direction opposite to the rotation direction of the casing and at a rotation speed greater than the rotation speed of the casing. Drilling method.   The bucket support means for rotatably supporting the bucket is fixed to the inner peripheral surface of the casing, and the bucket is rotationally driven by the bucket drive means mounted on the bucket support means. The drilling method according to claim 1.   The drilling method according to claim 2, wherein the bucket support means is fixed to the inner peripheral surface of the casing by gripper means mounted on the bucket support means. In the drilling method in which the bucket is accommodated in the casing press-fitted into the ground, and the bottom of the casing is excavated by rotating the bucket,
Suspending the bucket support means supporting the bucket rotatably in the casing together with the bucket, and landing the bucket on the bottom of the hole;
Fixing the bucket support means supporting the bottomed bucket to the inner peripheral surface of the casing with gripper means mounted on the bucket support means;
In parallel with the press-fitting while rotating the casing, the bucket is rotated in the direction opposite to the rotation direction of the casing by the bucket driving means mounted on the bucket support means and at a rotation speed larger than the rotation speed of the casing. And letting it take into the bucket while excavating the sediment at the bottom of the hole,
The step of releasing the fixed of the bucket support means with respect to the inner peripheral surface in the casing, and carrying out the bucket after the earth and sand intake together with the bucket support means to the outside of the casing and discharging the earth and sand in the bucket;
A hole drilling method comprising: In the bucket type drilling device in which the bucket is accommodated in the casing press-fitted into the ground, and in parallel with the press-fitting while rotating the casing, the bucket is also rotated to excavate the hole bottom of the casing.
Bucket support means suspended and supported by the rope;
A bucket that is rotatably supported by the bucket support means and is accommodated in the casing together with the bucket support means;
Gripper means mounted on the bucket support means and governing fixation and release of the bucket support means with respect to the inner peripheral surface of the casing;
Bucket driving means mounted on the bucket support means, and rotating the bucket in a direction opposite to the rotation direction of the casing and at a rotation speed greater than the rotation speed of the casing;
A bucket-type drilling device comprising:   6. The bucket drilling apparatus according to claim 5, wherein both the gripper means and the bucket drive means are hydraulic. Having hydraulic relay means mounted on the upper end of the casing,
When lifting the bucket support means from within the casing, while lifting the hydraulic relay means on the bucket support means,
7. When the bucket support means is suspended in the casing, the hydraulic relay means is transferred to the upper end of the casing, and then the bucket support means is lowered alone. The bucket type drilling device described.   The hydraulic relay means includes a hose reel unit that controls winding and unwinding of a hydraulic hose connecting the hydraulic relay means, a hydraulic gripper means, and a bucket driving means, respectively. Item 8. The bucket drilling device according to Item 7.   The bucket type drilling device according to any one of claims 5 to 8, wherein the bucket support means is suspended and supported by a crane type mother machine via a cable body.   10. The bucket according to claim 5, wherein an excavation blade and an opening for taking in earth and sand are formed in the bottom cover, and the bottom cover itself is openable and closable. Bucket type drilling device.

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