JP7130543B2 - Construction machine and construction machine assembly method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine and a method for assembling the construction machine, and more particularly, a construction machine and a construction machine equipped with a turning position fixing device for fixing at an arbitrary position an upper turning body that is rotatable with respect to a lower traveling body. related to the assembly method of

Conventionally, in construction machinery, an upper revolving body that can turn via a revolving bearing is provided on the upper part of the lower traveling body, and a ring-shaped braked plate provided on the upper revolving body is provided on the lower traveling body in a scissors-like gripping manner. A turning position fixing device is known that can fix the upper turning body at an arbitrary position with respect to the lower traveling body by holding it with a device (see, for example, Patent Document 1).

Japanese Patent No. 3424127

The plate to be braked, which constitutes the rotating position fixing device described above, is subjected to a large external force during operation. are tightened together. However, at the time of assembly, it is necessary to connect the mounting holes provided in each member of the upper revolving body, the revolving bearing, and the plate to be braked in advance. was a factor. In particular, it is not easy to keep the heavy plate to be braked at a constant height in a narrow space at the bottom of the fuselage, which poses a problem of a heavy burden on the operator.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a construction machine having a turning position fixing device that can be easily and stably assembled with a simple structure, and a method for assembling the construction machine.

In order to achieve the above object, the construction machine of the present invention is provided with an upper revolving body rotatably provided on the upper part of the lower traveling body via a revolving bearing, and a plate to be braked concentric with the center of revolving on the upper revolving body. A slewing bearing case in a construction machine which is provided with clamping devices for clamping the plate to be braked in each of the lower running bodies, and which can fix the upper rotating body at an arbitrary position with respect to the lower running body by operating the clamping devices. A holding bolt that can be screwed to hold the plate to be braked is provided on the lower surface, and the upper surface of the swivel bearing case holding the plate to be braked is brought into contact with the lower surface of the upper rotating body by the holding bolt. In addition, the upper revolving body, the revolving bearing case, and the plate to be braked can be integrally fixed together by tightening together with a plurality of mounting bolts and nuts at fixed positions where the mounting bolt through-holes are aligned with each other. It is characterized by being composed of

Further, the plate to be braked is, at the fixed position, only two members of the upper revolving body and the revolving bearing case out of the three members of the upper revolving body, the revolving bearing case and the plate to be braked. The construction machine is characterized by having a notch-shaped bolt escape portion that enables joint fastening using a part of a plurality of mounting bolts and nuts, and further, the construction machine is characterized in that the upper revolving body The pile driver is provided with a leader provided on the front part so that it can be raised and lowered, and an auger provided so that it can be raised and lowered along the front surface of the leader, and the driving force is obtained from the auger to form piles in the ground. It is characterized by

Further, in the construction machine assembling method of the present invention, an upper revolving body is rotatably provided on the upper part of the lower traveling body via a revolving bearing, and a plate to be braked concentric with the center of revolving is attached to the upper revolving body. A construction machine that is provided with clamping devices for clamping the plate to be braked on each body, and that can fix the upper rotating body at an arbitrary position with respect to the lower traveling body by operating the clamping devices, the construction machine comprising: A holding bolt that can be screwed to hold the plate to be braked is provided on the lower surface, and the upper surface of the swivel bearing case holding the plate to be braked is brought into contact with the lower surface of the upper rotating body by the holding bolt. In addition, the upper revolving body, the revolving bearing case, and the plate to be braked can be integrally fixed together by tightening together with a plurality of mounting bolts and nuts at fixed positions where the mounting bolt through-holes are aligned with each other. a step of temporarily tightening the holding bolt so as to maintain a state in which the mounting bolt through-holes of the swing bearing case and the plate to be braked are aligned with each other; , the mounting bolt through-holes of the upper revolving body and the revolving bearing case are aligned with each other, and the relative positions of the three members of the upper revolving body, the revolving bearing case, and the plate to be braked are maintained. A step of temporarily tightening the mounting bolt with the nut and a step of fully tightening the holding bolt and the mounting bolt respectively with a set tightening torque are performed in this order.

Further, the plate to be braked is, at the fixed position, only two members, the upper swing body and the swing bearing case, out of the three members of the upper swing body, the swing bearing case, and the plate to be braked. It has a notch-shaped bolt escape portion that allows for joint fastening using a part of a plurality of mounting bolts and nuts, and removal of the plate to be braked is performed by the mounting bolt corresponding to the bolt escape portion and a nut is not loosened. In addition, the construction machine includes a leader provided in the front part of the upper revolving structure so that it can be raised and lowered, and a leader provided along the front face of the leader so that it can be raised and lowered. and an auger, and a driving force is obtained from the auger to form piles in the ground.

According to the present invention, since the holding bolt for holding the plate to be braked in place is provided on the lower surface of the slewing bearing case, the slewing bearing case and the plate to be braked are attached in advance prior to assembly with the upper rotating body. It is possible to keep the through holes of the mounting bolts aligned with each other, and the assembly can be performed easily and stably. In addition, the retaining bolts that hold the plate to be braked by temporary tightening are temporarily tightened with nuts, and then fully tightened together with the final tightening of the mounting bolts. It becomes possible to carry out the assembly at the same time, and the assembling efficiency can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the pile driver which shows the example of one form of this invention. It is a plan view of the main part of the same. It is a side view of the main part of the same. FIG. 4 is a part diagram of a plate to be braked; FIG. 3 is a cross-sectional view taken along the line VV of FIG. 2; FIG. 3 is a sectional view taken along line VI-VI of FIG. 2; FIG. 3 is a cross-sectional view taken along line VII-VII of FIG. 2;

1 to 7 show an embodiment in which the construction machine of the present invention is applied to a pile driver. The pile driver 11, as shown in FIG. An upper revolving body 14 is rotatably provided at the upper portion via a revolving bearing 13, and a working device (not shown) for piling, such as a leader and an auger, is provided at the front portion of the upper revolving body 14. It is On the main frame 14a of the upper revolving body 14, an operation room 15 having a hydraulic control unit is provided on the right side, and an engine room 16 containing an engine and a hydraulic pump is provided on the left side. Furthermore, jack cylinders 17 are provided at four locations on the front, rear, left, and right of the upper revolving body 14, respectively, and a counterweight mounting portion 18 projecting from the lower rear end of the upper revolving body 14 is provided with a counter for balancing the machine body. Weight 19 is mounted.

The slewing bearing 13 disposed between the lower traveling body 12 and the upper revolving body 14 is fixed to the central upper surface of the track frame 12b of the lower traveling body 12 with mounting bolts 20 and nuts 21, as shown in FIGS. An inner case 13a that is a swivel bearing case on the inner ring side and an outer case 13b that is a swivel bearing case on the outer ring side fixed to the central lower surface of the main frame 14a of the upper rotating body 14 with mounting bolts 22 and nuts 23. A plurality of mounting bolt through-holes 13c and 13d into which mounting bolts 20 and 22 are inserted are formed in the respective cases 13a and 13b so as to form a circumference. An internal gear 13e is formed on the inner periphery of the inner case 13a, and a gear of a revolving drive motor (not shown) mounted on the upper revolving body 14 is meshed with the internal gear 13e to rotate the revolving drive motor. , the upper swing body 14 swings horizontally with respect to the lower traveling body 12 .

When the pile driver 11 is used for the purpose of burying steel pipe piles, the driving force is obtained from the auger and the steel pipe piles are rotationally press-fitted into the ground in a pile driving posture in which the leader is erected. For this reason, the pile driver 11 is provided with a turning position fixing device capable of fixing the upper turning body 14 at an arbitrary position during operation. The turning position fixing device 24 is composed of a braked plate 25 provided on the upper turning body 14 and concentric with the center of turning, and a clamping device 26 provided on the lower traveling body 12 for clamping the braked plate 25. ing.

The plate 25 to be braked is formed in a ring shape by combining a pair of half members 25a, 25a having the same shape. A plurality of mounting bolt through holes 25b corresponding to the holes 13d are provided. As a result, as shown in FIG. 5, with the plate to be braked 25 arranged on the lower surface of the outer case 13b, the three members of the main frame 14a, the outer case 13b, and the plate to be braked 25 are aligned with each other through the mounting bolt through holes. At fixed positions where 14b, 13d and 25b are aligned, they are configured so that they can be integrally tightened and fixed together by a mounting bolt 22 and a nut 23. As shown in FIG.

Further, as shown in FIG. 6, the plate 25 to be braked is held at the fixed position by a holding bolt 27 screwed into a female screw hole 13f provided on the lower surface of the outer case 13b. The holding bolts 27 are inserted into holding bolt through-holes 25c (FIG. 4) provided on both sides of the pair of half-split members 25a, 25a along the plurality of mounting bolt through-holes 25b. Further, as shown in FIG. 7, the plate 25 to be braked is the main frame 14a, the outer case 13b, and the plate 25 to be braked. It has a U-shaped notched bolt relief portion 25d that enables the screws to be fastened together. Two bolt relief portions 25d are provided on each of the pair of half-split members 25a, 25a (FIG. 4). The four bolt relief portions 25d are arranged at approximately equal intervals in the circumferential direction (Fig. 2).

The clamping device 26 is provided at two front and rear locations facing each other with the swivel bearing 13 interposed therebetween, and is supported by a base member 26a bolted to the wall of the track frame 12b and a pivot pin 26b on the base member 26a. and a chuck cylinder 26d for opening and closing both chuck levers 26c, 26c. When the chuck cylinder 26d is operated by hydraulic pressure, both ends of the chuck lever 26c are closed. It is designed to hold the outer edge of the plate 25 to be braked.

When assembling the pile driver 11 formed in this way, first, the swivel bearing 13 and the plate to be braked 25 are assembled in advance as parts. Here, in the swivel bearing 13, the plate to be braked 25 is arranged with the mounting surface of the plate to be braked facing upward, and the mounting bolt through holes 13d and 25b of the outer case 13b and the plate to be braked 25 are aligned. The retaining bolt 27 is inserted from above and temporarily tightened (manually tightened) so as to maintain the closed state. Next, after lifting the slewing bearing 13 by a crane and turning it upside down, it is moved onto the track frame 12b, and the inner case 13a is fixed to the track frame 12b using mounting bolts 20 and nuts 21. FIG.

Subsequently, the upper revolving body 14 on which various devices are mounted is lifted and aligned on the lower traveling body 12 so that the mounting bolt through holes 14b and 13d of the main frame 14a and the outer case 13b are aligned. Here, since the outer case 13b and the plate 25 to be braked hold the mounting bolt through holes 13d and 25b of each other in a communicating state, the mounting bolt through holes 14b of the main frame 14a and the outer case 13b are held in communication. , 13d are aligned with each other, the three members are brought into a fixed position state in which the mounting bolt through holes 14b, 13d, and 25b are aligned with each other. Next, the mounting bolts 22 are inserted from above so that the relative positions of the main frame 14a, the outer case 13b, and the plate 25 to be braked are maintained, that is, while the fixed positions are maintained, and the nuts 23 are temporarily tightened (by hand). )do.

Finally, the holding bolt 27 and the mounting bolt 22 that are temporarily tightened are tightened with a tightening torque set using, for example, a rod-shaped torque wrench for the holding bolt 27 and an impact wrench, for example, for the mounting bolt 22. Tighten each. Then, the clamping device 26 is attached to the front and rear of the track frame 12b, and the leader and auger are mounted on the front portion of the upper revolving body 14, and the counterweight is mounted on the rear portion, respectively, to complete the assembly work.

As described above, since the holding bolts 27 for holding the plate 25 to be braked in a fixed position are provided on the lower surface of the outer case 13b of the swivel bearing 13, the outer case 13b and the brake plate 25 can be mounted in advance prior to assembly with the main frame 14a. The mounting bolt through-holes 13d and 25b of the brake plate 25 can be aligned with each other, and the assembly can be performed easily and stably. Further, the holding bolt 27 holding the plate 25 to be braked by temporary tightening is temporarily tightened with the nut 23, and then is fully tightened in conjunction with the work of fully tightening the mounting bolt 22. Therefore, each bolt 22, 27 can be continuously tightened without omission, and the assembling efficiency can be improved. In particular, the number of mounting bolts 22 and nuts 23 tends to increase in the pile driver 11 among construction machines, since a large external force (torque) acts on the revolving portion during the pile driving operation. Therefore, by applying the present invention to the pile driver 11, it is possible to secure quality such that a bolt-nut structure that is inexpensive and excellent in fastening strength can be maintained while obtaining a more remarkable effect in terms of assembly.

By the way, when performing maintenance of the pile driver 11, the plate to be braked 25 may be replaced with a new one. In this case, it is necessary to loosen the mounting bolts 22 and the nuts 23, but the work is performed without loosening the four mounting bolts 22 and nuts 23 corresponding to the bolt relief portions 25d. As a result, since the relative position between the main frame 14a and the outer case 13b does not change, the parts to be replaced can be easily assembled. Moreover, since the four fastened mounting bolts 22 are arranged at approximately equal intervals in the circumferential direction, there is no possibility that the upper revolving body 14 will become unstable during work.

Although the present invention has been described using a pile driver as an example of construction machinery, the present invention is not limited to this, and can be applied to an excavator such as an earth drill having a telescopic kelly bar. Also, the structure of the turning position fixing device is not particularly limited, and the member forming the ring-shaped plate to be braked may be divided into three or four parts, and the shape of the bolt escape portion may be a round hole or the like. Furthermore, the number and arrangement of the clamping devices can also be appropriately changed according to the size and shape of the swiveling portion.

DESCRIPTION OF SYMBOLS 11... Piling machine 12... Lower running body 12a... Crawler 12b... Track frame 13... Swivel bearing 13a... Inner case of swivel bearing 13b... Outer case of swivel bearing 13c, 13d... Mounting bolt through hole , 13e... internal gear, 13f... female screw hole, 14... upper revolving body, 14a... main frame, 14b... mounting bolt through hole, 15... driver's cab, 16... engine room, 17... jack cylinder, 18... counterweight mounting Part 19... Counterweight 20... Mounting bolt 21... Nut 22... Mounting bolt 23... Nut 24... Turning position fixing device 25... Braking plate 25a... Half member 25b... Mounting bolt through hole , 25c... Holding bolt through hole 25d... Bolt escape portion 26... Clamping device 26a... Base member 26b... Rotating pin 26c... Chuck lever 26d... Chuck cylinder 27... Holding bolt

Claims (6)

An upper revolving body is rotatably provided on the upper part of the lower traveling body via a revolving bearing, and a clamping device clamps a plate to be braked concentrically with the center of revolution on the upper revolving body and the plate to be braked on the lower running body. In the construction machine which is provided with each and can fix the upper revolving body to the lower running body at an arbitrary position by the operation of the clamping device, the brake plate can be screwed to the lower surface of the revolving bearing case. A holding bolt is provided, and the upper surface of the revolving bearing case holding the plate to be braked is brought into contact with the lower surface of the upper revolving body by the holding bolt, and the upper revolving body, the revolving bearing case, and the lower surface of the upper revolving body are brought into contact with each other. A construction machine characterized in that the three members, including the brake plate, are integrally fixed by a plurality of mounting bolts and nuts at fixed positions in which mounting bolt through-holes are aligned with each other. Of the three members of the upper revolving body, the revolving bearing case, and the plate to be braked, only two members, the upper revolving body and the revolving bearing case, are attached to the plurality of brake plates at the fixed position. 2. The construction machine according to claim 1, wherein the construction machine has a notch-shaped bolt escape portion that enables joint fastening using a part of the mounting bolt and the nut. The construction machine includes a leader that can be raised and lowered at the front portion of the upper rotating body, and an auger that is provided to move up and down along the front surface of the leader. 3. The construction machine according to claim 1 or 2, wherein the construction machine is a pile driver for forming piles on the ground. An upper revolving body is rotatably provided on the upper part of the lower traveling body via a revolving bearing, and a clamping device clamps a plate to be braked concentrically with the center of revolution on the upper revolving body and the plate to be braked on the lower running body. A construction machine capable of fixing the upper revolving body to an arbitrary position with respect to the lower running body by operation of the clamping device, wherein the screw engagement holds the plate to be braked on the lower surface of the revolving bearing case. The upper surface of the revolving bearing case holding the plate to be braked is brought into contact with the lower surface of the upper revolving body by the holding bolt, and the upper revolving body and the revolving bearing case are brought into contact with each other. A method for assembling a construction machine, wherein the plate to be braked and the three members are integrally fixed together by a plurality of mounting bolts and nuts at fixed positions in which the mounting bolt through-holes are aligned with each other, temporarily tightening the holding bolts so that the mounting bolt through-holes of the slewing bearing case and the plate to be braked are aligned with each other; temporarily tightening the mounting bolts with the nuts so that the mounting bolt through-holes of the upper revolving body, the revolving bearing case, and the plate to be braked are maintained relative to each other; and final tightening of the holding bolt and the mounting bolt with a set tightening torque. Of the three members of the upper revolving body, the revolving bearing case, and the plate to be braked, only two members, the upper revolving body and the revolving bearing case, are attached to the plurality of brake plates at the fixed position. It has a notch-shaped bolt escape portion that allows fastening and fixing together using a part of the mounting bolt and nut, and the mounting bolt and nut corresponding to the bolt escape portion are removed when the plate to be braked is removed. 5. The method for assembling the construction machine according to claim 4, wherein the assembly is carried out without loosening. The construction machine includes a leader that can be raised and lowered at the front portion of the upper rotating body, and an auger that is provided to move up and down along the front surface of the leader. 6. The method for assembling a construction machine according to claim 4 or 5, wherein the pile driver is a pile driver for forming piles in the ground.

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