JP4699332B2 - Earth drill kellyba - Google Patents

Description

  The present invention relates to a ground drill kelly bar, and more particularly, to a shock absorber mounting structure for preventing noise generation due to rolling collision between split kelly bars in a telescopic kelly bar.

  For example, a ground drill is attached to the upper part of the front frame, a kelly drive device is attached to the rotary drive body of the kelly drive device, and the kelly bar is inserted into the hole of the rotary drive body so that it cannot move up and down, and a ground drill bucket is attached to the lower end of the kelly bar. It becomes. The kelly bar is connected and supported via a swivel joint (rotary joint) to a wire rope that is wound up from a winch mounted on the revolving structure and suspended from the top of the boom.

  At the time of excavation, the kelly bar is rotated together with the rotary drive body by the operation of the hydraulic motor provided in the kelly drive device, and the weight of the kelly bar and the bucket or, if necessary, the press device provided in the kelly drive device. The excavation is performed by applying a load to the bucket, and when the bucket is filled with earth and sand, the bucket is lifted up to the ground with a kelly bar and dumped, and then the vertical is mainly used for the cast-in-place pile as the foundation of the structure. Drill a hole.

  As a conventional earth drill kelly bar, generally, a plurality of split kelly bars having different horizontal cross-sections are prevented from rotating together, and can be expanded and contracted to be combined in a multistage expansion type. Is used. In a conventional earth drill having such a telescopic kelly bar, in order to prevent the generation of impact sound when adjacent kelly bars collide due to the rolling of the kelly bar, the inner part is divided from the outer kelly bar which is the outermost divided kelly bar. A cushioning material made of non-metal is attached to the outer peripheral portion of the upper end of the Keriba. Conventionally, the cushioning material is attached by bolts (see Patent Document 1), rivets (see Patent Document 2), and protrusions (see Patent Document 3) provided on the outer peripheral surface of the Kelly bar.

JP 2003-328675 A No. 7-35909 JP 2004-278168 A

  In the telescopic kellyba as described above, the force in the thrust direction (vertical direction) of the kellyba is easily applied to the cushioning material as the kellyba expands and contracts. For this reason, since the shock absorbing material is received by the bolts, rivets, and protrusions that are fixed to the Keriba, there is a problem that the shock absorbing material is deformed, broken, or easily dropped off. Also, the dropout may occur due to breakage of bolts or rivets. In addition, as the force applied to the cushioning material, there are radial direction and rotational direction of Kellyba, but the radial direction force is small because it is only the backlash of each step, and the driving force in the rotational direction is received by the driven rib, Basically, it is not added to the cushioning material.

  In view of the above problems, an object of the present invention is to provide a kelly bar for an earth drill having a mounting structure that can securely hold a buffer material provided at the upper end of a split kelly bar and prevent deformation, dropout, and breakage of the buffer material. To do.

The ground drill kelly bar of the present invention is a ground drill kelly bar in which a plurality of divided kelly bars having different horizontal cross-sectional sizes are mutually prevented from rotating and relatively vertically movable.
Two ring-shaped plates are welded to the upper end of at least one of the divided kelivas other than the outermost divided keriva, with a space in the vertical direction,
Fit the cushioning material between the two ring-shaped plates so that the outer periphery protrudes from the outer periphery of the ring-shaped plate ,
The bolt is inserted from above into the bolt insertion hole provided in the upper ring-shaped plate and cushioning material and screwed into the screw hole provided in the lower ring-shaped plate, or the bolt inserted through the cushioning material is placed on the lower side. The cushioning material is fixed between the upper and lower ring-shaped plates by screwing into a nut provided separately from or welded to the ring-shaped plate .

  In the present invention, the force acting in the thrust direction on the cushioning material as the kelly bar expands and contracts is received by the upper and lower ring-shaped plates fitted with the cushioning material, so that the cushioning material is securely held. For this reason, falling off and damage of the buffer material are prevented. Further, since the force acting on the shock absorbing material in the thrust direction is received by the upper and lower ring-shaped plates fitted with the shock absorbing material, the force in the thrust direction is not applied to the bolt for fixing the shock absorbing material. For this reason, there is no deformation | transformation of a volt | bolt and replacement | exchange of a shock absorbing material becomes easy. Further, the buffer material is prevented from falling off due to broken bolts.

FIG. 1 is a side view showing an example of an earth drill to which the kelly bar of the present invention is applied. In FIG. 1, reference numeral 1 denotes a crawler type traveling body, and 2 a revolving body installed on the traveling body 1 via a revolving device 3. On the swivel body 2 are mounted a power unit 4, an operator cab 5, and the like provided with a hydraulic pressure source of an actuator such as a hydraulic cylinder and a hydraulic motor of each part to be described later and a generator as a power source.

  Reference numeral 6 denotes a boom attached to the swing body 2 so as to be raised and lowered, 7 denotes a front frame attached to the swing body 2 so as to be raised and lowered, and 9 denotes a kelly drive device attached to the upper part of the front frame 7. Are known. In this example, the case where the boom 6 is non-expandable is shown, but a multistage telescopic type may be used for this boom. Reference numeral 10 denotes a hydraulic cylinder for raising and lowering the boom 6. Reference numeral 11 denotes a hydraulic cylinder attached to the front frame 7 for raising and lowering the front frame 7, and a wire rope 12 wound and unwound by expansion and contraction of the hydraulic cylinder 11 is attached to the hydraulic cylinder 11, the front frame 7 and the boom 6. The front frame 7 is undulated by the expansion and contraction of the hydraulic cylinder 11 by being hung around the attached sheaves 13 and connected to the revolving body 2. There are various types of hoisting devices for the boom 6 and the front frame 7 such as those using winches.

Reference numeral 15 denotes a kelly bar which is inserted in a rotary drive body (not shown) of the kelly drive device 9 so as to be movable up and down and not relatively rotatable. The bucket 16 has a conical bottom cover 16a having an excavation claw for earth and sand and an intake port for earth and sand at the bottom.

  Reference numeral 17 denotes a winch mounted on the swivel body 2, and 18 denotes a wire rope wound and fed by the winch 17. The wire rope 18 is suspended from the sheave 19 at the top of the boom 6 and connected to the kelly bar 15 through a swivel joint (rotary joint) 20. In addition, as a bucket attached to the lower end of the kelly bar 15, there is a case where not only a shaft digging bucket but also a bottom expansion bucket having an expandable blade that can be opened or closed, or a bucket having both functions of shaft digging and bottom expansion digging may be attached. In addition, Kelly Drive is equipped with a turntable equipped with a hose reel for winding up a hydraulic hose for performing bottom expansion excavation and a cable reel for winding an electric signal transmission leading to a device that detects the opening / closing angle of the enlarged wing. It may be attached to the lower part of the device 9 via a center joint (a rotary joint for supplying hydraulic fluid for a hydraulic device that opens and closes an enlarged blade and transmitting an electric signal).

  As shown in the longitudinal sectional view of FIG. 2 and the transverse sectional view of FIG. 3, the kelly bar 15 can relatively move up and down and move a plurality of cylindrical divided kelly bars 15 a to 15 d having different horizontal cross-sectional sizes. The wire rope 18 is connected to the upper end connection portion 21 via the swivel joint 20 shown in FIG. Reference numeral 22 denotes a bucket coupling portion provided at the lower end portion of the innermost divided kelly bar 15 d, and a bucket such as the shaft excavating bucket 16 is coupled to the coupling portion 22. Reference numeral 23 denotes a spring receiver provided at the upper portion of the coupling portion 22, and reference numeral 24 denotes a spring receiver attached to the upper portion of the spring receiver 23 so as to be movable up and down with respect to the divided kelly bar 15 d, and a coil spring between these spring receivers 23, 24. The buffer material 25 which consists of is interposed. The cushioning material 25 reduces the impact when the divided keriva 15d collides with the lower end of the adjacent divided keriva 15c when the keriva 15 contracts.

A plurality of (three in the illustrated example) ribs 26a to 26d for receiving the rotational force are welded to the outer periphery of each of the divided kelly bars 15a to 15d in the vertical direction over almost the entire length. Ribs 26a of the outermost divided Keriba 15a is intended to be fitted into the groove for torque transmission provided on the inner periphery of the ring-shaped rotary drive member provided to the Kelly drive 9 (not Fig Chinese) . The ribs 26b to 26d of the other divided kelly bars 15b to 15d are for transmitting rotational force of a plurality of sheets (six in this example) which are welded in the circumferential direction on the lower inner peripheral surfaces of the divided kelly bars 15a to 15c adjacent to the outside. Inserted between the plates 27a to 27c, the rotational force of the adjacent outer divided kelly bars 15a to 15c is transmitted by the abutment between the ends of the plates 27a to 27c in the rotational direction and the ribs 26b to 26d.

  28a to 28c are stoppers attached to the upper outer peripheral surfaces of the divided kerivas 15b to 15d, respectively. The divided kerivas 15b to 15d are respectively lowered with respect to the adjacent adjacent kerivas 15a to 15d, and the divided kerivas 15a to 15c are respectively provided. The kelly bars 15b to 15d are prevented from coming off by being latched by a latching portion (not shown) provided on the lower inner peripheral surface.

  Reference numeral 29 is a flange provided at the upper end of the outermost divided kelly bar 15a, and 30 is a shock absorber made of hard rubber or plastic or a combination thereof attached to the lower surface thereof by bolts 31, and the rotary drive body of the kelly drive device 9 This prevents the generation of impact and impact sound when coming into contact with the upper surface of the plate.

  Reference numeral 32 denotes a cushioning material provided at the upper end of each of the divided kerivas 15b and 15c, and prevents the generation of an impact sound caused by the roll of the keliva 15. 4 is a cross-sectional view showing the mounting structure of the cushioning material 32, FIG. 5 is a plan view of the kelly bar, FIG. 6 is a plan view of the cushioning material 32, and FIG. 7 is a cross-sectional view taken along line EE of FIG.

  Ring-shaped plates 33 and 34 are welded to the upper ends of the divided kelly bars 15b and 15c, respectively, with an interval in the vertical direction. The upper ring-shaped plate 33 is provided with a through hole 33a through which the bolt 35 of the cushioning material 32 is inserted, and the lower ring-shaped plate 34 is provided with a screw hole 34a at a position corresponding to the through hole 33a.

  The cushioning material 32 is made of hard rubber, plastic, or a combination thereof. As shown in FIGS. 6 and 7, the cushioning material 32 has an arc shape obtained by dividing an arc-shaped ring. Each has a plurality of through holes 32a through which the bolts 35 are inserted. A plurality of these cushioning materials 32 are fitted between the ring-shaped plates 33 and 34, respectively, and bolts 35 are respectively inserted into the through-holes 33 a of the upper ring-shaped plate 33 and the through-holes 32 a of the cushioning material 32. The plate plate 34 is fixed by screwing into the screw hole 34a. When the cushioning material 32 is attached in this manner, the cushioning material 32 protrudes outward from the outer circumferences of the ring-shaped plates 33 and 34, respectively, and when the kelly bar 15 rolls, the cushioning material 32 becomes the inner circumference of the divided kelly bars 15a and 15b. Contact the surface.

  According to this embodiment, the force acting in the thrust direction on the cushioning material 32 in accordance with the expansion and contraction of the kelly bar 15 is received by the upper and lower ring-shaped plates 33 and 34 fitted with the cushioning material 32. Is securely held. For this reason, the buffer material 32 is prevented from falling off or being damaged. Further, since the force acting on the shock absorbing material 32 in the thrust direction is received by the upper and lower ring-shaped plates 33, 34 fitted with the shock absorbing material 32, the force in the thrust direction is applied to the bolt 35 that fixes the shock absorbing material 32. Don't join. For this reason, the deformation of the bolt 35 is eliminated, and the cushioning material 32 can be easily replaced. In addition, the shock-absorbing material 32 is prevented from falling off due to breakage of the bolt 35.

  In the said Example, it can apply to the thing provided with two or more division | segmentation kelivas. In the said embodiment, it is comprised by the four division | segmentation kerivers 15a-15d, and the example which attached the shock absorbing material 31 to the two division | segmentation kerivers 15b and 15c among 15b-15d other than the outermost division | segmentation kellyba 15a. Although shown, the buffer material 31 may be attached to one of the divided kelly bars 15b, 15c, and 15d, and the buffer material 31 is more preferably attached to all of the divided kelly bars 15b to 15d.

  In the above embodiment, the bolt 35 is fixed by screwing the bolt 35 into the screw hole 34a in the lower ring-shaped plate 34. However, the bolt 35 is screwed to a nut separated from the lower ring-shaped plate 34 or welded. In combination, the bolt 35 may be fixed.

  Further, the keriva of the present invention can be applied to a square keriva. Further, the kelly bar of the present invention is an earth drill having a structure in which a leader is set up at the front portion of the revolving body 2 and a kelly drive device is vertically movable along the leader, and the kelly drive 15 is inserted into the kelly drive device. Can also be applied.

It is a side view which shows an example of the earth drill to which the kelly bar of this invention is applied. It is a longitudinal cross-sectional view which shows one Embodiment of the kelly bar of this invention. FIG. 3 is a cross-sectional view of the Keriba in FIG. 2. FIG. 3 is a partially enlarged view of FIG. 2. FIG. 3 is a plan view of the Keriba in FIG. 2. It is a top view of the shock absorbing material of this Embodiment. It is EE sectional drawing of the shock absorbing material of FIG.

Explanation of symbols

1: traveling body, 2: swiveling body, 3: swiveling device, 4: power unit, 5: cab, 6: boom, 7: front frame, 9: kelly drive device, 10, 11: hydraulic cylinder, 12: wire Rope, 13: Sheave, 15: Keriva, 15a to 15d: Divided Keriva, 16: Shaft bucket, 17: Winch, 18: Wire rope, 19: Sheave, 20: Swivel joint joint, 21: Connection, 22: Coupling Part, 23, 24: spring support, 25: buffer material 26a-26d: rib, 27a-27d: plate for rotational force transmission, 28a-28c: stopper, 29: flange, 30: buffer material, 31: bolt, 32: Buffer material, 33, 34: Ring-shaped plate, 33a: Through hole, 34a: Screw hole, 35: Bolt

Claims (1)

In the earth drill kelly bar, which is formed by fitting a plurality of divided kelly bars having different horizontal cross-section sizes to each other so as to be relatively movable up and down,
Two ring-shaped plates are welded to the upper end of at least one of the divided kelivas other than the outermost divided keriva, with a space in the vertical direction,
Fit the cushioning material between the two ring-shaped plates so that the outer periphery protrudes from the outer periphery of the ring-shaped plate ,
The bolt is inserted from above into the bolt insertion hole provided in the upper ring-shaped plate and cushioning material and screwed into the screw hole provided in the lower ring-shaped plate, or the bolt inserted through the cushioning material is placed on the lower side. A grounding drill kelly bar, wherein the cushioning material is fixed between the upper and lower ring-shaped plates by screwing into a nut provided separately from or welded to the ring-shaped plate .

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