JP4043344B2 - Leader rack structure of rack lifting device and pile driver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rack lifting device that moves up and down along a leader of a pile driving machine, and a rack structure of a leader corresponding to the rack lifting device.
[0002]
[Prior art]
One method of burying foundation piles is the medium digging method. For example, as shown in FIG. 8, the intermediate excavation method uses a pile driving machine 100 that stands a leader forward, a base machine, an auger drive 110 connected to a screw 130 that outputs rotation, and a steel pipe pile 140 that passes through the screw 130. The rack lifting device 120 is press-fitted with respect to the leader 101, and the screw 130 excavates the ground by driving the auger drive 110, and the rack lifting device 120 is lowered to the excavated ground. Then, the steel pipe pile 140 is buried.
[0003]
The auger drive 110 and the rack lifting / lowering device 120 are slidably attached to the guide pipe 105 formed on the leader 101 by guide gibs 111 and 121. The auger drive 110 is hung on a wire rope 103 sent via a sheave 102 at the upper end of the leader 101, and the rack lifting / lowering device 120 has a pinion gear 122 meshed with a rack gear 106 formed on the leader 101.
[0004]
The auger drive 110 descends by excavating the ground pressed by the gravity of the auger drive 110 and the auger drive 110 is pulled up by rewinding the wire rope 103. On the other hand, the rack lifting / lowering device 120 moves up and down along the leader 101 by rotating the pinion gear 122 engaged with the rack gear 106 of the leader 101 in order to press-fit the attached steel pipe pile 140 into the ground.
[0005]
Next, the rack structure of the rack 101 and the leader 101 rack structure of the pile driving machine 100 to which the rack lifting apparatus 120 is mounted will be described. 9 and 10 are a front view and a side view showing the rack lifting device 120, and FIG. 11 is a view showing a CC cross section of FIG.
The rack gear 106 provided in the leader 101 is geared to the left and right as shown in FIG. 9, and as shown in FIG. 11, a pair of pinion gears 122 and 122 are engaged from the left and right, and the rack lifting and lowering device 120 is engaged. Is installed. The rack lifting / lowering device 120 includes a pair of driving means 124 and 124 that rotate the pinion gears 122 and 122. The drive means 124 outputs the rotation of the drive motor via a speed reducer, and the left and right pinion gears 122 and 122 fixed to the output shaft mesh with the rack gear 106 with idler gears 123 and 123 interposed therebetween. Yes.
[0006]
The reason why the idler gears 123 and 123 are interposed without directly engaging the pinion gears 122 and 122 with the rack gear 106 is that a through pipe 126 is required to be provided at the center of the apparatus main body. This is because it must be left and right. In the rack lifting / lowering device 120, the chuck device 150 for attaching the steel pipe pile 140 is provided below, but the through pipe 126 is arranged so as to overlap the pile center O of the steel pipe pile 140 held by the chuck device 150. As shown in FIG. 8, the screw 130 connected to the auger drive 110 passes through the formed through hole.
[0007]
[Problems to be solved by the invention]
However, such a conventional rack lifting / lowering device 120 has a problem that the pile center O is separated from the leader 101 and the stability of the pile driving machine 100 is deteriorated. That is, in the conventional rack lifting and lowering device 120, the through pipe 126 is configured to avoid the rotation shafts 125 and 125 of the idler gears 123 and 123, so that the pile center O is separated from the leader 101 when attached to the leader 101. It will be located. And also about the auger drive 110 which must attach the screw 130 through the through-tube 126, the position of the drive shaft 112 is matched with the pile center O. FIG. Therefore, the center of gravity of the working device attached to the leader such as the auger drive 110 and the rack lifting / lowering device 120, and further the screw 130 and the steel pipe pile 140 is separated from the leader 101, and the stability of the pile driving machine 100 is deteriorated.
[0008]
Further, since the conventional rack lifting / lowering device 120 meshes with the pinion gears 122 and 122 via the idler gears 123 and 123 through the rack gear 106, the number of parts increases, and the weight increases and the cost increases. It was. Furthermore, the rack lifting / lowering device 120 can dispose the guide gibbs 121 and 121 to be mounted on the reader 101 only above and below the idler gears 123 and 123, which increases the height of the device and also increases the weight. It was a result.
[0009]
Therefore, in order to solve this problem, the present invention has an object to provide a rack lifting device that is compact and can be stably mounted on a pile driving machine, and a leader rack structure of the pile driving device on which the rack lifting device is mounted. .
[0010]
[Means for Solving the Problems]
Rack lifting device according to the present invention, engaging the pinion gear rack gear formed in the reader, there is capable of lifting along the leader by rotating the pinion gear, the center of the apparatus body, through A drive means is arranged on the left and right sides with a space where a pipe or a work device attachment portion can be installed, and a pinion gear attached to the drive means is directly meshed with a rack gear.
The drive means means the drive motor itself when the pinion gear is directly attached to the motor shaft of the drive motor. When the pinion gear is attached via the speed reducer, the drive motor and the speed reducer are combined. Say things.
[0011]
The embodiment of the rack lifting apparatus according to the present invention is preferably as follows.
A space formed between the left and right drive means is provided with a through pipe or a work device mounting portion.
The apparatus main body has an attachment surface for fixing the drive means on the reader side to be mounted, and the drive means is attached to the attachment surface by being inserted from the reader side.
Guide gibs are arranged between the left and right pinion gears.
The pinion gear is arranged on the leader side to be attached from the guide give.
The guide give is fixed directly to the apparatus main body.
[0012]
Therefore, according to the present invention, for example, in a rack lifting and lowering device used in the digging method, by providing a through pipe in the space in the center of the apparatus main body, the through pipe can be arranged at a position close to the leader. The pile center will be closer to the leader, and the stability of the pile driver will be improved. On the other hand, if the auger drive is provided with the space in the center of the apparatus main body as a work apparatus mounting portion, the leader can be moved up and down and a compact work apparatus can be obtained.
Since the drive means is inserted into the apparatus main body from the reader side and attached, it can be assembled without interfering with the through-pipe and the like, and as a result, it is possible to avoid enlarging the apparatus main body more than necessary.
[0013]
Further, since the pinion gear and the guide give are arranged at the same height, a compact rack lifting device with a short vertical dimension can be obtained. Furthermore, if the drive means is protruded toward the leader side and the pinion gear is arranged closer to the leader side than the guide gib, the through pipe provided in the apparatus body is less likely to be restricted by the drive means, and the pile center is closer to the leader. And the diameter of the through pipe can be increased. If the guide gib is directly fixed to the apparatus main body, the distance between the leader and the apparatus main body can be reduced, and also in this respect, the pile center can be brought closer to the leader and the pile driver can be stabilized.
[0014]
On the other hand, in the leader rack structure of the pile driving machine according to the present invention, in the leader provided with a rack gear for mounting the rack lifting device so as to be movable up and down, the rack gear is on the outer side of the guide pipe and has teeth only on one of the left and right sides. It is formed.
And as for the leader rack structure of the pile driving machine which concerns on this invention, it is desirable for the said rack gear to be provided in the position near the shaft center of a leader rather than the said guide pipe.
[0015]
Therefore, according to the present invention, the pinion gear can be engaged with the rack gear outside the guide pipe, and the pile center is brought closer to the leader by mounting the rack lifting device, so that the stability of the pile driving machine is improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, one embodiment of a rack lifting apparatus according to the present invention and a leader rack structure of a pile driving machine to which the rack lifting apparatus is attached will be described below with reference to the drawings. FIG. 1 shows a working machine for performing a medium excavation method in which a rack lifting device and an auger drive are attached to a leader of a pile driving machine and a steel pipe pile is press-fitted into the ground excavated by a screw, as in the conventional example. 2 and 3 are a front view and a side view showing the rack elevating device and the auger drive provided with the chuck mechanism shown in FIG. FIG. 4 is a cross-sectional view of the rack lifting device shown in FIG.
[0017]
As shown in FIG. 4, the rack lifting / lowering device 1 includes a pair of drive means 12 and 12 with a through pipe 11 provided in the center. The drive means 12, 12 outputs the rotation of the drive motor via a speed reducer, and pinion gears 13, 13 are fixed to the output shaft. In the present embodiment, in particular, the pinion gears 13 and 13 are configured to directly mesh with the rack gears 31 and 31 of the reader 3 without using the idler gear 123 (see FIG. 11).
[0018]
On the other hand, the leader 3 of the pile driver 10 also has a configuration different from the conventional one corresponding to the rack lifting device 1. That is, the rack gears 31 and 31 formed on the leader 3 are not formed with teeth on both the left and right sides as in the prior art, but a separate one having teeth only on one side as shown in the drawing. 32 is fixed symmetrically.
Since the rack gears 31 and 31 are divided into left and right in this way, there is no need to transmit the rotation to the central portion via the idler gears 123 and 123 as in the prior art (see FIG. 11), and the pinion gear 13 fixed to the driving means 12 and 12 is used. , 13 can be directly meshed with the rack gears 31, 31.
[0019]
The reason why the rack lifting device 1 needs to move the driving means 12 and 12 to the left and right in this way is that the through pipe 11 needs to be provided at the center. In this embodiment, the pinion gears 13 and 13 are required. Is directly meshed with the rack gears 31, 31, so that the rotation shafts 125, 125 (see FIG. 11) of the idler gears 123, 123 are not necessary as in the conventional case, and a space for arranging the through-tube 11 in the apparatus main body 15 is secured. did it. Therefore, the center of the through pipe 11, that is, the position of the pile center can be brought closer to the leader 3.
[0020]
By the way, when the drive means 12, 12 is assembled to the apparatus main body 15, it is necessary to prevent the drive means 12, 12 from interfering with the through pipe 11. Therefore, in the present embodiment, a mounting surface 15a is formed on the side surface of the apparatus main body 15 on the reader side so that the driving means 12, 12 can be inserted and fixed to the apparatus main body 15 from the reader side. Therefore, the drive means 12 and 12 are inserted into the apparatus main body 15 from the side of the drive motor having the smaller diameter, and the speed reducer portion having the larger diameter is assembled without interfering with the through pipe 11.
[0021]
Further, conventionally, guide gibs 121 and 121 are provided above and below the rack lifting device 120 in order to avoid the idler gear 123 (see FIG. 10). However, in this embodiment, the guide pipes 33 and 33 of the leader 3 are connected to the rack gear 31. , 31, and in the rack lifting device 1, the guide gibs 14, 14 are arranged between the pinion gears 13, 13. The guide gibs 14, 14 are directly attached to the attachment surface 15 a of the apparatus main body 15 in order to reduce the distance between the apparatus main body 15 and the reader 3, and the driving means 12, 12 arranged on the outside are connected from the apparatus main body 15 to the reader 3. It is assembled so as to protrude greatly to the side.
[0022]
Next, the construction by the working machine shown in FIG. 1 in which the auger drive 2 is mounted on the pile driving machine 10 together with the rack lifting device 1 will be briefly described. As shown in the figure, the pile driving machine 10 has a leader 3 in front of the pile driving machine vertically raised by a back stay 4, and a rack lifting device 1 and an auger drive 2 are mounted on the pile driving device 10 so as to be moved up and down. In both the rack lifting device 1 and the auger drive 2, the guide gibs 14 and 21 sandwich the guide pipe 33 of the leader 3 so as to be slidable from both sides, the auger drive 2 is suspended from the wire rope 5, and the rack lifting device 1 is shown in FIG. As shown in FIG. 2, a pair of pinion gears 13 and 13 mesh with left and right rack gears 31 and 31 formed on the leader 3, respectively.
[0023]
The rack elevating device 1 holds the steel pipe pile 140 in the lower chuck device 6. As a specific example, as shown in FIGS. 2 and 3, the annular frame 26 is lifted by the expansion and contraction operation of the chuck cylinder 25, and a wedge-shaped chuck 28 suspended by a link 27 on the inside of the annular frame 26 extends in the center direction of the steel pipe pile 140. Press and hold. The chuck device 6 is also provided with a guide give 29, which is slidably attached to the guide pipe 33 of the reader 3. On the other hand, a screw 130 is connected to the auger drive 2 on a drive shaft 22 projecting downward from the auger drive 2. At this time, the screw 130 penetrates the through pipe 11 and the steel pipe pile 140 of the rack lifting / lowering device 1 as shown in FIG.
[0024]
When the auger drive 2 is activated, the screw 130 to which the rotation has been applied digs the ground by being pressed by the gravity of the auger drive 2. In the auger drive 2, the wire rope 5 is fed out as the screw 130 is dug, and the guide gibs 21 and 21 slide along the guide pipes 33 and 33 and descend along the leader 3. On the other hand, in the rack lifting and lowering apparatus 1, the pinion gears 13 and 13 that are rotated by the driving units 12 and 12 roll the rack gears 31 and 31 engaged with each other and move up and down along the leader 3. In this case, the rack lifting and lowering device 1 descends according to the ground excavation of the screw 130, and the steel pipe pile 140 is press-fitted into the ground excavated by the screw 130.
[0025]
As described above, in the rack lifting / lowering apparatus 1 according to the present embodiment, the idler gear is eliminated and a wide empty space is created in the apparatus main body, so that the pile center of the screw 130 penetrating the steel pipe pile 140 and the through pipe 11 is placed on the leader 3. I was able to approach. Therefore, the center of gravity of the rack lifting / lowering device 1 and the auger drive 2 approaches the leader 3 and the stability of the pile driving machine 10 can be remarkably improved.
In addition, since the mounting positions of the drive means 12 and 12 are shifted to the leader 3 side, a wide empty space can be secured in the apparatus main body, and the diameter of the through pipe 11 is increased without increasing the distance from the leader 3 to the pile center. Thus, a large-diameter screw 130 can be used.
Further, since the guide gibs 33 and 33 are directly fixed to the apparatus main body 15, the distance between the leader 3 and the apparatus main body 15 can be reduced, and also in this respect, the pile center is brought closer to the leader to stabilize the pile driver. I was able to.
[0026]
In the conventional example shown in FIG. 11, the driving means 124 and 124 are inserted and assembled from the X direction. However, in this embodiment, the driving means 124 and 124 are driven so that the reduction gear portion having a large diameter does not interfere with the through pipe 11. Since the means 12 and 12 are inserted into the apparatus main body 15 from the opposite direction and assembled, the diameter of the through pipe 11 can be increased to the limit of the assembly position of the drive means 12 and 12 as shown in FIG. Further, it is not necessary to provide a space required for assembling the driving means 12 and 12 in the apparatus main body 15, and the rack lifting apparatus 1 is not increased in size.
[0027]
In addition, since the rack lifting device 1 has the guide gibs 14 disposed at the same height as the pinion gear 13 as viewed from the side as shown in FIG. 3, the height of the rack lifting device 1 can be reduced. In the prior art, the guide gibbs 121 and 121 that are located above and below the pinion gear 122 (see FIG. 10) are only the guide gibs 14 that are the same height as the pinion gear 13, and the idler gear is eliminated. Weight reduction and low cost became possible.
[0028]
By the way, in the case of the work by the working machine shown in FIG. 1, the soil transmitted through the spiral blade of the screw 130 is discharged from the top of the rack lifting device 1, but in order to prevent the soil from falling from a high position, it is shown in FIG. 5. In some cases, a bucket 8 for temporarily storing soil to be discharged is attached. At this time, two rack lifting / lowering devices 1 are mounted on the upper and lower sides of the bucket 8, but the rack lifting / lowering device 1 according to the present embodiment realizes a reduction in size and weight as described above. Is suitable.
[0029]
Next, the rack lifting and lowering apparatus 1 according to the present invention is applicable not only to the medium digging method provided with the through pipe 11 through which the screw 130 is passed as in the above embodiment, but also to work devices used for other methods. it can. 6 and 7 are a front view showing a rack lifting / lowering device 1 for raising / lowering the auger drive 2 and a sectional view taken along the line BB in FIG. In addition, regarding the structure of the rack lifting / lowering device 1 and the reader 3 of the above-described embodiment, the same components will be described with the same reference numerals.
[0030]
The rack lifting and lowering device 51 of this embodiment includes a pair of drive means 12 and 12 as described above, and the pinion gears 13 and 13 fixed to the output shaft thereof are idler gears with respect to the rack gears 31 and 31 of the reader 3. It is comprised so that it may mesh directly, without going through. Here again, the rack gears 31 and 31 of the reader 3 are separated to the left and right, and the rack lifting and lowering device 51 has the pinion gears 13 and 13 and the driving means 12 and 12 to which the pinion gears 13 are fixed separated from each other to the left and right. Therefore, an empty space 52 is formed in the center of the apparatus body of the rack lifting / lowering apparatus 51, and a work apparatus such as an auger drive 55 can be integrally attached thereto.
[0031]
In the above embodiment, the auger drive 2 is suspended from the wire rope 5. However, for example, when the steel pipe pile 140 connected to the drive shaft 56 is rotationally press-fitted with a rack elevating auger, the size of the rack elevating device is long in the past. Moreover, since it was connected to the auger drive in the vertical direction, the portion occupied by the working device became large in the limited height due to the total length of the leader 3, and the size of the steel pipe pile that could be used was shortened accordingly.
[0032]
However, in the rack lifting and lowering device 51 of the present embodiment, the guide gibs 14 and 14 are provided at the same height as the pinion gears 13 and 13 to make the device compact, and the auger drive 55 can be placed in the device main body. Therefore, the dimension of the working device 50 is remarkably shortened, and the steel pipe pile to be used can be made long.
[0033]
As mentioned above, although embodiment was described about the rack structure of the rack raising / lowering apparatus and the leader of the pile driving machine which mounts the rack raising / lowering apparatus, this invention is not limited to this, Various in the range which does not deviate from the meaning. It can be changed.
For example, the drive means 12 of the embodiment has a speed reducer, and the pinion gear 13 is attached to the output shaft that outputs the rotation of the drive motor via the speed reducer. However, the pinion gear 13 is directly attached to the motor shaft. It may be the one.
[0034]
【The invention's effect】
The present invention is capable of moving up and down along the leader by meshing with a rack gear formed on the leader and rotating the pinion gear, and left and right so as to leave a space in the center of the apparatus body. Since the driving means is arranged and the pinion gear attached to the driving means is directly meshed with the rack gear, it is possible to provide a rack lifting device that is compact and stable to the pile driving machine.
[0035]
Further, the present invention provides a reader equipped with a rack gear for mounting the rack lifting device so that the rack lifting device can be moved up and down because the rack gear is formed on the outer side of the guide pipe and teeth are formed only on the left and right sides. By approaching the leader, it is possible to provide a leader rack structure of a pile driver equipped with the rack lifting device that improves the stability of the pile driver.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing a working machine for performing an intermediate excavation method in which a rack lifting device according to an embodiment is mounted.
2 is a front view showing a rack lifting device and an auger drive including the chuck mechanism shown in FIG. 1. FIG.
3 is a side view showing a rack elevating device and an auger drive provided with the chuck mechanism shown in FIG. 1;
4 is a cross-sectional view taken along the line AA of the rack lifting apparatus shown in FIG.
FIG. 5 is a view showing a working machine for performing the medium excavation method in which the rack lifting device of the embodiment is mounted.
FIG. 6 is a front view showing a rack elevating device for elevating an auger drive.
7 is a cross-sectional view taken along the line BB in FIG.
FIG. 8 is a view showing a working machine for performing a medium excavation method in which a conventional rack lifting device is mounted.
FIG. 9 is a front view showing a conventional rack lifting device.
FIG. 10 is a side view showing a conventional rack lifting device.
11 is a view showing a CC cross-sectional portion of FIG. 9; FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rack raising / lowering device 2 Auger drive 3 Leader 10 Pile driver 11 Through pipe 12 Driving means 13 Pinion gear 14 Guide give 31 Rack gear 33 Guide pipe

Claims (7)

In a rack lifting device capable of moving up and down along a leader by meshing a pinion gear with a rack gear formed on the leader and rotating the pinion gear,
In the center of the device body, a drive means is arranged on the left and right sides with a space where a through pipe or work device attachment part can be installed, and the pinion gear attached to the drive means is directly meshed with the rack gear. A rack lifting device characterized by that. In the rack lifting and lowering device according to claim 1 ,
The apparatus main body has an attachment surface for fixing the driving means on the reader side to be mounted, and the driving means is inserted and attached to the attachment surface from the reader side. Rack lifting device. In the rack raising / lowering device according to claim 1 or 2 ,
A rack lifting and lowering device, characterized in that guide gibs are arranged between the left and right pinion gears. In the rack lifting and lowering device according to claim 3 ,
The rack raising and lowering device according to claim 1, wherein the pinion gear is arranged on a leader side attached from the guide gib. In the rack raising / lowering device according to claim 3 or 4 ,
The rack lifting device, wherein the guide give is fixed directly to the apparatus main body. In a reader equipped with a rack gear for mounting the rack lifting device so that it can be lifted and lowered,
A pile rack leader rack structure characterized in that the rack gear is outside the guide pipe and has teeth formed on only one of the left and right sides. In the leader rack structure of the pile driver according to claim 6 ,
The leader rack structure of a pile driving machine, wherein the rack gear is provided at a position closer to the axis of the leader than the guide pipe.

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