JPH09125384A - Workbench elevating device for pile driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly raise/lower a workbench, even if a gravity center and a hanging center are not coincided with each other. SOLUTION: A workbench 70 having a movable mount 42 slidably supported to a guide rail 36 provided in a leader 2 via guide gibs 40, a boarding mount 64 rotatably supported by the movable carriage 42 is provided. A workbench winch for raising/lowering the workbench 70 by a wire 48 fastened to the movable mount 42 is provided. A guide roller 82 contacted with the guide rail 48 by receiving a rotation moment by dead load of the workbench 70 is attached.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an auxiliary work for pile construction by a construction mechanism such as an auger drive mechanism and a hammer mechanism,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a workbench elevating device for a pile construction machine that moves up and down a workbench used for maintenance and inspection work of a construction mechanism.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Publication No. 57-26926, a workbench is vertically mounted on a guide shaft having a hexagonal cross section provided along a leader, and the workbench is suspended by a winch. It is known that a rotating mechanism for rotating a guide shaft is attached to a lower side surface of a reader. Then, the guide shaft is rotated by the rotating mechanism to improve the accessibility between the construction mechanism that moves up and down along the leader and the workbench.

[0003]

However, in such a conventional apparatus, since the center of gravity of the workbench is suspended by the wire and the suspended workbench is rotated together with the guide shaft, the winch wire is also moved together with the workbench. Otherwise, the wire would be entangled, making it difficult to handle. On the other hand, if the center of gravity of the workbench does not match the center of suspension of the wire, there is a problem that the workbench cannot be smoothly moved up and down when the workbench is moved up and down.

An object of the present invention is to provide a work platform lifting device for a pile construction machine which can smoothly lift the work platform even if the center of gravity and the center of suspension do not coincide with each other.

[0005]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, in the pile construction machine that elevates and lowers the construction mechanism along the first guide rail provided on the standing leader, in the second guide rail provided on the leader in parallel with the first guide rail, the guide gib is interposed. A work table having a movable table slidably supported by a movable table and a platform supported by the movable table so as to be rotatable, and a work table for elevating and lowering the work table by a wire fastened to the movable table. A winch is provided, and a guide roller for contacting the second guide rail upon receiving a rotation moment due to the weight of the work table is attached to the movable table, and a work platform lifting device for a pile construction machine. That is it.

The guide roller may be provided on the lower side of the movable table, or may be provided on one side surface of the movable table. Further, it may be provided both on the lower side of the movable table and on one side surface. Further, the guide gib may be supported so as to be swingable around a support shaft parallel to the second guide rail, and a guide roller attached to one side surface of the movable table may be moved by a spring urging force. 2 The spring may be biased in a direction away from the guide rail.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1 and FIG.
Is a main body of a self-propelled pile construction machine using crawlers, and the leader 2 is supported by a pair of stays 4 and a catching hawk 6 so that the leader 2 can be tilted up and down, and the leader 2 is supported so that it can be swiveled around its axis. Has been done.

Two long first guide rails 8 and 10 having a circular cross section are laid along the longitudinal direction of the leader 2 (see FIG. 5), and the first guide rails 8 and 10 are provided on the first guide rails 8 and 10. The auger drive mechanism 12 is slidably engaged with the first guide rails 8 and 10 via a plurality of guide gibs 14. The auger drive mechanism 12 includes a rotary shaft 7 described later.
It is configured to rotationally drive the auger drill 16 attached to the No. 2.

Further, the pushing mechanism 18 connected to the auger drive mechanism 12 is slidably engaged with the first guide rails 8 and 10 via the plurality of guide gibs 20. Has been done. The pushing mechanism 18 is a pile 71.
It is configured such that an axial pushing force is applied to the.

The auger drive mechanism 12 includes a hanging sheave 22.
Is rotatably supported, one end of the wire 24 is fastened to the upper end of the leader 2, and a plurality of hanging sheaves 22 and a plurality of sheaves 26 rotatably supported on the upper end of the leader 2. After being wrapped around, the sheave 28 is rotatably supported on the upper end of the leader 2.

Further, the wire 24 is wound around a rotary drum 34 of a main winch 32 provided in the pile construction machine main body 1 via a sheave 30 rotatably supported in the middle of the leader 2, and the main winch 32 is provided. Driven by auger drive mechanism 1
2. The pushing mechanism 18 can be moved up and down.

Further, as shown in FIG.
Second guide rails 36 and 38 having a circular cross section are laid in parallel with the first guide rails 8 and 10, and the movable table 42 is connected to the second guide rails 36 and 38 via a plurality of guide gibs 40. It is slidably engaged along the guide rails 36 and 38.

In this embodiment, the guide give 40 has a structure shown in FIG.
As shown in FIG. 5, a semicircular groove 40a corresponding to the outer shape of the second guide rails 36, 38 is formed.
The second guide rails 36 and 38 are attached to the first guide rail 36 and are configured to slide. Further, the guide give 40 is swingably supported by the moving base 42 around a fulcrum pin 41 parallel to the second guide rails 36, 38, and the pin 43 inserted into the guide give 40 and the moving base 42 allows the guide give 40 to move. The swing of the guide give 40 can be regulated.

The pin 43 is pulled out, and the guide give 40 is swung to the position shown by the chain double-dashed line in FIG. 8 to separate the second guide rails 36 and 38 from the groove 40a, and the pin 43 is again provided.
It can be fixed in that state by inserting. One ends of wires 48, 50 are fastened to the moving base 42, and the wires 48, 50 are hung on a pair of sheaves 52, 54 rotatably supported on the upper end of the reader 2 to move the wires of the leader 2. It is wound around the drum 58 of the work bench winch 56 attached to the lower end side surface.

As shown in FIGS. 3 to 5, a mounting base 64 is supported on the moving base 42 by a supporting shaft 66 parallel to the second guide rails 36 and 38 so as to be rotatable around the supporting shaft 66. There is. The boarding platform 64 includes a flat floor 68 on which a worker can board and a fence member 69 that surrounds the four floors of the floor 68, and may have a floor area large enough for at least one worker to board.

When the support shaft 66 is rotated around the support shaft 66, the platform 64 is moved to the storage position a (the position shown by the solid line in FIG. 5), and when in the storage position a, the auger drive mechanism 12 is moved.
Even when the push-in mechanism 18 is moved up and down, the workbench 70 does not interfere with the auger drive mechanism 12 and the push-in mechanism 18.

When the platform 64 is rotated 90 degrees around the support shaft 66 at the working position b (the position shown by the chain double-dashed line in FIG. 5), the platform 64 is configured to approach the rotary shaft 72. ing. In the present embodiment, the guide give 40,
A working table 70 is configured by the moving table 42 and the boarding table 64. The push-in mechanism 18 is used in the case of the underground digging pile construction method, and may be provided as necessary.

As shown in FIGS. 3 to 5, the center of gravity p of the work table 70 is located away from the second guide rails 36 and 38, and in this embodiment, it is closer to the moving table 42 of the board 64. is there. When the platform 64 moves from the storage position a to the work position b, the center of gravity p also moves accordingly. The fastening positions of the wires 48, 50 and the moving base 42 are near the moving base 42 between the second guide rails 36, 38 and the center of gravity p.

A support member 73 is attached to the lower side of the moving table 42, and as shown in FIG. 6, the supporting member 73 is orthogonal to the moving table 42 and has second guide rails 36 and 38.
Sliding holes 74 and 76 having a bottom opening toward the bottom are formed. Holder members 78 and 80 are slidably inserted into the sliding holes 74 and 76, and guide rollers 82 and 84 are inserted into the holder members 78 and 80, respectively, and the pins 86 are orthogonal to the second guide rails 36 and 38. , 88 rotatably supported.

On the outer circumference of the guide rollers 82 and 84, a second
Grooves 82a, 84 corresponding to the outer shapes of the guide rails 36, 38
a is formed, and push bolts 90, 9 screwed into the bottoms of the sliding holes 74, 76 coaxially with the holder members 78, 80.
The front end of No. 2 is applied to the rear ends of the holder members 78 and 80. By rotating the push bolts 90 and 92, the holder member 7
8 and 80 are slid so that the grooves 82 of the guide rollers 82 and 84
The a and 84a can be brought into contact with the second guide rails 36 and 38.

A support member 94 is attached to one side surface of the movable table 42 opposite to the work position b and at a position higher than the center of gravity p of the work table 70.
A bottomed sliding hole 96 opening toward the second guide rail 38 is formed therein. The sliding hole 96 is formed so as to be orthogonal to the second guide rail 38 and also to the sliding holes 74 and 76.

A holder member 98 is slidably inserted in the sliding hole 96, and a guide roller 100 is rotatably supported in the holder member 98 by a pin 102 orthogonal to the second guide rail 38. . On the outer periphery of the guide roller 100, the groove 10 corresponding to the outer shape of the second guide rail 38 is formed.
4 are formed.

The tip of the push bolt 106 screwed into the bottom of the sliding hole 96 coaxially with the holder member 98 has the holder member 98.
It is applied to the rear end of. The push bolt 106 is rotated to slide the holder member 98 so that the groove 104 of the guide roller 100 can be brought into contact with the second guide rail 38. Furthermore, the holder member 98 is biased by the coil spring 108 interposed between the holder member 98 and the support member 94 in the direction in which the guide roller 100 is separated from the second guide rail 38.

Next, the operation of the work platform elevating / lowering device for the pile construction machine according to this embodiment will be described. Auger drive mechanism 1
The auger drill 1 inserted in the hollow inside of the pile 71 by 2
While rotating 6, the pressing mechanism 18 applies a pressing force in the axial direction to build the pile 71. Then, when it is installed to a predetermined depth, the auger drive mechanism 12 and the push-in mechanism 18 drive the main winch 32 to raise it along the first guide rails 8 and 10. Next, a new pile 71 is added and the auger drills 16 are connected to each other.

Then, the reader 2 is lowered to the lower end,
An operator rides on the platform 64 at the storage position a, drives the platform winch 56, and raises the platform 70 along the second guide rails 36, 38 to near the tip of the auger drill 16. At that time, the center of gravity p of the workbench 70 is
As shown in FIG. 3, it is located at a position away from the second guide rails 36 and 38, and a rotational moment acts due to the weight of the workbench 70.

The guide roller 8 is driven by this rotation moment.
2, 84 are pressed against the second guide rails 36, 38, and the guide rollers 82, 84 rotate to rotate the workbench 70.
Rises smoothly. That is, the rotation moment due to its own weight is received by the guide rollers 82 and 84.
Moves smoothly.

Next, the operator on the workbench 70 instructs another operator on the ground side to operate the main winch 32 to lower the auger drive mechanism 12. Then, the platform 64 is swiveled around the support shaft 66, moved from the storage position a to the work position b indicated by the chain double-dashed line in FIG. 5, and the platform 64 is brought closer to the auger drill 16.

For example, in connection work, the auger drive mechanism 1
The auger drill 16 is inserted in the hexagonal hole formed in the rotary shaft 72 of
Since the hexagonal shaft at the tip of is inserted, the rotary shaft 72 and the auger drill 16 must be connected in phase with each other. At that time, the operator instructs the operator on the ground to perform an inching operation of the rotary shaft 72, and moves the auger drill 16 or the like so that the phases are aligned with each other. Auger drill 1
After inserting 6, the operator on the workbench 70 turns the rotary shaft 72
Insert the connecting pin into the pin insertion hole of with a hammer etc.

In the state where the board 64 is moved from the storage position a to the work position b, as shown in FIG.
The center of gravity p of 0 also moves. The center of gravity p is close to the work position b, and the work table 70 is acted upon by a rotational moment. With this rotation moment, the guide roller 100 is pressed against the second guide rail 38, and when the platform 64 is in the work position b, the work table winch 56 is driven to raise and lower the work table 70. Moves up and down smoothly.

Next, after the connection work is completed, the boarding base 64 is turned around the support shaft 66 toward the storage position a.
After reaching the storage position a, the work table winch 56 is driven to lower the work table 70. Also in that case, the workbench 70
Although the rotation moment acts due to its own weight, the guide rollers 82 and 84 are pressed against the second guide rails 36 and 38, and the guide rollers 82 and 84 rotate and the worktable 7
0 descends smoothly.

On the other hand, the movable table 42 is attached to the second guide rail 3
When removing from 6, 38, first, the push bolt 106 is rotated to the loosening side, the holder member 98 is slid by the biasing force of the coil spring 108, and the guide roller 100 is separated from the second guide rail 38. . And pin 43
Is pulled out, the guide give 40 is swung to be separated from the second guide rails 36 and 38, and then the pin 43 is inserted to fix the guide give 40. As a result, the moving base 42 can be easily removed from the second guide rails 36, 38.

As described above, the present invention is not limited to such an embodiment, and can be implemented in various modes without departing from the gist of the present invention.

[0033]

As described in detail above, in the workbench lifting device for pile construction machines according to the present invention, even if the center of gravity and the center of suspension are not coincident with each other, the guide roller causes the guide roller to move due to the rotational moment due to the weight of the workbench. It has the effect of being pushed up against the table and the work table can be smoothly moved up and down.

[Brief description of the drawings]

FIG. 1 is a front view of a pile construction machine provided with a work bench lifting device for a pile construction machine as one embodiment of the present invention.

FIG. 2 is a side view of a pile construction machine equipped with the work platform lifting device for a pile construction machine according to the present embodiment.

FIG. 3 is an enlarged front view of a work platform lifting device for a pile construction machine according to the present embodiment.

FIG. 4 is a sectional view taken along the line AA of FIG. 3;

FIG. 5 is an enlarged plan view when the workbench of the workbench lifting device for the pile construction machine according to the present embodiment is in the retracted position.

6 is an enlarged cross-sectional view of BB of FIG.

FIG. 7 is an enlarged CC sectional view of FIG.

FIG. 8 is a DD enlarged cross-sectional view of FIG.

[Explanation of symbols]

 1 ... Pile construction machine main body 2 ... Leader 12 ... Auger drive mechanism 36, 38 ... 2nd guide rail 40 ... Guide gib 42 ... Moving stand 48, 50 ... Wire 56 ... Work table winch 64 ... Boarding stand 66 ... Support shaft 70 ... Workbench 82, 84, 100 ... Guide roller

Claims (5)

[Claims] 1. A pile construction machine for elevating and lowering a construction mechanism along a first guide rail provided on an upright leader, comprising: a second guide rail provided on the leader in parallel with the first guide rail. A worktable having a movable base slidably supported via a guide gib and a platform supported so as to be pivotable on the movable base is provided, and the worktable is lifted and lowered by a wire fastened to the movable base. A winch for a work table is provided, and a guide roller that comes into contact with the second guide rail upon receiving a rotation moment due to the weight of the work table is attached to the movable table. lift device. 2. The workbench lifting device for a pile construction machine according to claim 1, wherein the guide roller is provided below the movable table. 3. The workbench lifting device for a pile construction machine according to claim 1, wherein the guide roller is provided on one side surface of the moving table. 4. The workbench lifter for a pile construction machine according to claim 1, wherein the guide gib is swingably supported around a support shaft parallel to the second guide rail. apparatus. 5. The pile construction according to claim 4, wherein the guide roller attached to one side surface of the movable table is spring-biased in a direction away from the second guide rail by a spring-biasing force. Workbench lifting device for machines.