JP4008297B2 - Pile driver leader right / left tilt control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leader left-right inclination regulating device that prevents a leader from swinging left and right when the leader of a pile driving machine including a leader capable of tilting in the left-right direction of a vehicle body is raised and lowered.
[0002]
[Prior art]
For example, a ground improvement machine which is a kind of pile driving machine disclosed in Japanese Patent Application Laid-Open No. 10-121460 is provided at a rear part of a base machine in a leader provided with a lower part in a front bracket at the front part of the base machine. By connecting two backstays that can be extended and retracted, both the backstays extend the leader in the longitudinal direction of the vehicle and change the amount of expansion of each of the two backstays. It is possible to incline in the direction so that not only vertical pile holes but also diagonal pile holes can be excavated.
[0003]
For this reason, as shown in FIGS. 10 and 11, the reader 4 can be tilted in the left-right direction of the vehicle body via the shaft 3 in the front-rear direction of the vehicle body on the support shaft 2 in the left-right direction of the vehicle body provided rotatably on the front bracket 1. The leader 4 is raised and lowered with the support shaft 2 as the center, and the leader 4 is tilted in the left-right direction of the vehicle body with the shaft 3 as the center.
[0004]
When the leader 4 is undulated in the longitudinal direction of the vehicle body, it is extremely dangerous if the leader 4 swings in the lateral direction of the vehicle body. Therefore, in order to prevent lateral deflection, a pair of left and right bolts 6, 6, when the leader 4 is raised and lowered, as shown in FIG. 10, the bolts 6 and 6 are advanced so that their tips abut against the support shaft 2 to regulate the swing of the leader 4. When standing up, as shown in FIG. 11, the bolts 6 and 6 are retracted and their tips are separated from the support shaft 2 to allow the leader 4 to swing, and the leader 4 can be tilted in the left-right direction of the vehicle body. I have to.
[0005]
[Problems to be solved by the invention]
However, in the tilt regulation by the contact of the bolt, when a slight external force is applied to the leader, a large load is applied to the bolt, and the screw part of the bolt is crushed or seized, making it impossible to screw the bolt. was there. For this reason, a large sized bolt is used, and handling such as requiring a large tool for screwing the bolt is difficult.
[0006]
Accordingly, an object of the present invention is to provide a leader left / right tilt regulating device for a pile driving machine which is easy to handle and does not damage parts even when an excessive load is applied when the leader is tilted in the left / right direction of the vehicle body.
[0007]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention can tilt the reader in the left-right direction of the vehicle body via the front-rear axis of the vehicle body on the support shaft in the left-right direction of the vehicle body that is rotatably provided on the front bracket of the front portion of the base machine. In the leader left-right inclination restricting device for a pile driving machine, which restricts the inclination of the leader in the left-right direction of the vehicle body by abutting a restriction member provided on the bottom wall of the leader so as to be able to advance and retreat on the support shaft. The member includes a shaft portion that is inserted in an insertion hole formed in the reader bottom wall so as to be able to advance and retreat, and a contact portion that is formed in a diameter larger than the shaft portion and contacts the support shaft. A spacer is inserted between the contact portion and the reader bottom wall to maintain the contact state when the contact portion is in contact with the support shaft.
[0008]
As a preferred embodiment, the contact portion contact surface of the support shaft and the contact surface of the contact portion are each formed in a plane, and the support shaft is tapered toward the shaft end. The contact portion contact surface is formed in a flat surface, the contact surface of the contact portion is formed in an inclined plane in which the shaft end direction is increased, the insertion hole is a square hole, and the shaft When the part is square in cross section, the spacer is formed in a bifurcated shape sandwiching the shaft part, and when the restriction member releases the contact of the contact part to the support shaft, The spacer pulled out from between the contact portion and the reader bottom wall can be mounted and stored in the shaft portion protruding from the reader bottom wall, and the restricting member is in the contact maintaining state or the Each of the spacers in the retracted state can be fixed to the shaft with bolts. And the like.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on the embodiments shown in FIGS. The pile driving machine 10 is provided with a lower part of a leader 13 rotatably on a front bracket 12 at the front part of a base machine 11, and the leader 13 is supported by a backstay 14 that can extend and contract from the rear of the base machine 11. The pile 16 is buried in the ground while rotating the pile 16 by the rotation drive device 15 provided so as to be movable up and down on the reader 13.
[0010]
The front bracket 12 has a pair of left and right arms 12a and 12b, and both arms 12a and 12b are provided with pivots 18 in the left-right direction of the vehicle body that pass through the lower portion of the reader 13 via bearings 17 respectively. Yes. The support shaft 18 is formed in a circular cross section at both ends supported by the bearing 17, and is formed in a tapered shape in which the other end has a quadrangular cross section and narrows from the center toward the shaft end. The bottom plane 18a is directed. A shaft 20 in the longitudinal direction of the vehicle body is fitted into the center portion of the support shaft 18, and the reader 13 is attached via the shaft 20. As a result, the leader 13 undulates in the longitudinal direction of the vehicle body about the support shaft 18 and can tilt in the lateral direction of the vehicle body about the shaft 20.
[0011]
On the bottom wall 19 of the reader 13, a right / left tilt regulating device 21 for the reader 13 is provided. The left / right inclination regulating device 21 includes an insertion hole 22 formed on the left and right of the bottom wall 19, a regulation member 23 provided in each insertion hole 22 so as to be able to advance and retreat, and abutting against the bottom flat surface 18 a of the support shaft 18, Each regulating member 23 is composed of a spacer 24 that maintains a contact state of the support shaft 18 with the bottom flat surface 18a.
[0012]
The bottom wall 19 is formed with an opening 25 in the left-right direction of the vehicle body. Plates 26 are fixed to both ends of the opening 25, that is, both ends of the opening 25 in the left-right direction of the vehicle body. Square grooves in the left-right direction of the vehicle body are formed. In these plates 26, the shaft portion 23 a of the restriction member 23 is inserted into the square groove, the lid member 27 is bolted to the opening side of the square groove, and the square groove serves as the insertion hole 22 of the restriction member 23.
[0013]
The restricting member 23 has a shaft portion 23a formed to have a length equal to or greater than the total thickness of the spacer 24 and the plate 26, and a diameter larger than that of the shaft portion 23a so as to contact the bottom flat surface 18a of the support shaft 18. The contact portion 23b is in contact with the shaft portion 23a and has a retaining portion 23c formed larger in diameter than the shaft portion 23a. The contact portion 23b is integrally formed on the upper portion of the shaft portion 23a, and the retaining portion 23c is integrally formed on the lower portion. Yes. The shaft portion 23a has a square cross section, the contact portion 23b also has a square cross section, and the upper contact surface 23d has a taper shape in which the support shaft 18 becomes thinner toward the shaft end and the contact portion. It is formed in the inclination plane which becomes high toward the axial end direction of the spindle 18 according to the bottom part plane 18a which 23b contacts. The retaining portion 23c is also formed in a square cross section, and a handle 23e is provided on the lower surface of the retaining portion 23c.
[0014]
The spacer 24 is a flat plate having bifurcated leg portions 24b, 24b in which a groove 24a sandwiching the shaft portion 23a is formed in the center portion, and includes a handle 24c. The spacer 24 has legs 24 on both sides of the groove 24 a between the contact portion 23 b and the upper surface of the plate 26 when the contact portion 23 b of the regulating member 23 is contacted with the bottom flat surface 18 a of the support shaft 18. The parts 24b and 24b are inserted and fixed by bolts 28 to the upper bolt holes 23f formed in the shaft part 23a of the regulating member 23. When the contact portion 23b is separated from the bottom flat surface 18a of the support shaft 18, the leg portions 24b and 24b on both sides of the groove 24a are inserted between the lower surface of the plate 26 and the retaining portion 23c. The bolt 28 is mounted and fixed in the lower bolt hole 23g formed in the shaft portion 23a of the regulating member 23 and stored.
[0015]
Accordingly, as shown in FIGS. 1 and 2, the two regulating members 23 are pushed up to bring the contact portions 23 b into contact with the bottom flat surface 18 a of the support shaft 18, and between the contact portions 23 b and the upper surface of the plate 26. By inserting the leg portions 24b and 24b of the spacer 24 and fixing them with the bolts 28, the reader 13 cannot be rotated around the shaft 19, the right and left inclination of the reader 13 is restricted, and the reader 13 is When standing or lying down, it is possible to prevent the reader 13 from shaking in the left-right direction of the vehicle body.
[0016]
As shown in FIGS. 8 and 9, when the reader 13 is erected, the spacers 24 are pulled out to lower the restricting members 23, and the contact portions 23b are separated from the bottom flat surface 18a of the support shaft 18, respectively. By doing so, the reader 13 can be tilted left and right. In this case, the spacer 24 is mounted and fixed on the shaft portion 23 a on the lower surface of the plate 26 and stored.
[0017]
In this way, by pushing up the regulating member 23 to bring the abutting surface 23d into abutment with the bottom flat surface 18a of the support shaft 18 and inserting the spacer 24, the abutting state is maintained, and the right and left inclination regulation of the reader 13 is restricted. It is easy to handle, and the abutting portion 23b and the support shaft 18 abut against each other and receive a load with the flat spacer 24. Therefore, the surface pressure can be reduced even with an excessive load. Can prevent damage to each part. Further, by making the insertion hole 22 and the shaft portion 23a of the restriction member 23 each have a square cross section, the restriction member 23 does not rotate when the restriction member 23 is operated, and the abutting surface 23d and the bottom flat surface of the support shaft 18 are prevented. 18a is always in plane contact. Further, since the spacer 24 is mounted and fixed on the shaft portion 23a of the regulating member 23 during storage, the spacer 24 can be prevented from being lost.
[0018]
In the above embodiment, the support shaft 18 having a square cross section is used, and the contact surface with the contact portion 23b of the restriction member 23 and the contact surface 23d of the restriction member 23 are each flat. In the case of a round support shaft, the shape of the contact surface 23d of the contact portion 23b may correspond to the shape of the contact surface of the support shaft. Further, the abutting portion 23b and the retaining portion 23c of the regulating member 23 may have a round cross section, and the abutting portion 23b at the upper portion of the shaft portion 23a and the retaining portion 23c at the lower portion are separately provided with bolts or the like. It may be a combination.
[0019]
【The invention's effect】
As described above, the leader left / right tilt restricting device of the pile driving machine of the present invention maintains the contact state of the restricting member with the support shaft by the spacer and prevents the leader from swinging left and right, so that it is easy to handle. It is. Further, by forming the support shaft and the contact surface of the restricting member on a flat surface, the surface pressure can be reduced even with an excessive load, and each component can be prevented from being damaged.
[Brief description of the drawings]
1 is a cross-sectional view taken along the line II in FIG. 4 showing a state in which the regulating member is in contact with the lower surface of the leader. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. ] Expanded side view of the lower part of the reader [FIG. 5] Cross-sectional plan view of the lower part of the reader [FIG. 6] Perspective view of the regulating member and spacer [FIG. 7] Bottom view of the reader [FIG. 4 is a cross-sectional view taken along line VIII-VIII in FIG. 4. FIG. 9 is a cross-sectional view taken along line IV-IV in FIG. 8. FIG. 10 is a cross-sectional view of the lower part of the reader. Sectional view of the lower part of the reader showing the deregulated state [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Pile driver, 11 ... Base machine, 12 ... Front bracket, 13 ... Leader, 18 ... Support shaft, 18a ... Bottom plane of support shaft 18, 19 ... Bottom wall of reader, 20 ... Shaft, 21 ... Left-right inclination regulation Device, 22 ... Insertion hole, 23 ... Restriction member, 23a ... Shaft part of restriction member 23, 23b ... Contact part of restriction member 23, 23c ... Retaining part of restriction member 23, 23d ... Contact surface of restriction member 23 24a spacer 24a spacer 24b 24b spacer 24 leg

Claims (7)

A leader is provided on a left and right support shaft pivotally provided on the front bracket of the front part of the base machine so that the reader can be tilted in the left and right direction of the vehicle body via an axis in the longitudinal direction of the vehicle body, and is provided on the bottom wall of the leader so as to be able to advance and retreat. In the leader left-right inclination restricting device of the pile driving machine that restricts the inclination of the leader in the left-right direction of the vehicle body by bringing the restriction member into contact with the support shaft, the restriction member is inserted through the reader bottom wall. A shaft portion that is inserted into the hole so as to be able to advance and retreat, and a contact portion that is formed to have a diameter larger than the shaft portion and contacts the support shaft, and when the contact portion contacts the support shaft, A leader left-right inclination regulating device for a pile driving machine, wherein a spacer is inserted between a contact portion and the leader bottom wall to maintain a contact state. The leader lateral inclination regulating device for a pile driving machine according to claim 1, wherein the contact portion contact surface of the support shaft and the contact surface of the contact portion are each formed in a flat surface. The support shaft has a tapered shape that narrows toward the shaft end, the contact portion contact surface is formed in a flat surface, and the contact surface of the contact portion is formed in an inclined flat surface in which the shaft end direction is increased. 3. The leader left-right inclination regulating device for a pile driving machine according to claim 1 or 2, characterized in that: 4. The leader left / right inclination regulating device for a pile driving machine according to claim 1, wherein the insertion hole is a square hole, and the shaft portion has a square cross section. The leader horizontal inclination restricting device for a pile driving machine according to any one of claims 1 to 4, wherein the spacer is formed in a bifurcated shape sandwiching the shaft portion. The shaft that protrudes from the reader bottom wall with the spacer pulled out from between the contact portion and the reader bottom wall when the contact of the contact portion with the support shaft is released. 6. The pile driver's leader right-and-left tilt restricting device according to claim 1, wherein the device can be stored by being mounted on a part. The pile driving machine according to any one of claims 1 to 6, wherein the regulating member is capable of fixing the spacer in the contact maintained state or the retracted state to the shaft portion with a bolt, respectively. Leader left / right tilt regulating device.

Images