JP2771843B2 - Excavator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an earth drill excavator, and more particularly, to an improvement in an excavator for excavating a hole for an expanded pile.

[Conventional technology]

In this type of excavator, the excavator that excavates the enlarged bottom portion of the enlarged pile hole includes a work implement main body, a crane boom, a front frame, and a keriba.

The work machine main body comprises a crawler-type traveling device with an upper revolving structure installed via a revolving device. The crane boom is composed of a lower boom member, a middle boom member, and an upper boom member, and the lower boom member is connected to the upper revolving unit with a pin, and can be lowered by a first winch device provided on the upper revolving unit. Are allowed to do so. The front frame includes a lower front frame and an upper front frame. The lower front frame is pinned at its lower end to the crane boom and can be lowered on the crane boom by a second winch device disposed between the crane boom. The upper front frame is fixed to the upper end of the lower front frame. Keriva is suspended via a swivel joint on the rope of the third winch device in the upper revolving structure, and is held by a drive mechanism incorporated in the upper front frame, and can be rotated by this drive mechanism. . The bucket is attached to the part extending downward from the upper front frame together with the stabilizer, and a driving mechanism for rotating a rotary fitting and a kelly bar for a hydraulic hose connecting hydraulic equipment in the bucket and a hydraulic drive device on the upper revolving unit, a hydraulic hose, A signal cable winding device is supported by the upper front frame.

An excavator for excavating the shaft portion of the hole for the expanded bottom pile is similarly configured. However, the bucket is a standard one for earth drills, and no equipment for the bucket for expanding the bottom, such as a winding device or a stabilizer, is mounted.

For excavation, first, an excavator equipped with a shaft part excavation bucket is installed at the excavation site, the front frame is lowered, and the excavation position is aligned with the bucket. After rotating the bucket and excavating the shaft part of the hole for the expanded bottom pile, then evacuate this excavator, replace it with an excavator with a bucket for excavating the expanded bottom part, and after aligning,
This is done by lowering the bucket at the bottom of the hole drilled by the shaft part drilling bucket and letting the bucket drill the expanded part.

[Problems to be solved by the invention]

In a conventional excavator, the excavator is thus replaced,
Not only must the excavation of the hole for the expanded bottom pile be performed, but also before the excavation, the middle boom member and the upper boom member are connected, the rope of the winch device that raises the crane boom is wrapped, and the front frame is connected to the lower boom member. Must be connected to the crane boom and the front frame, and the rope of the winch device must be wrapped around the sheave block for assembly. Therefore, considerable work is required before and after construction.

An object of the present invention is to provide an improved excavated hole for an expanded pile, which can excavate a shaft portion of the expanded pile hole, and can easily and quickly perform disassembly and reassembly. It is.

[Means for solving the problem]

The excavator is coupled to a work implement body having a traveling device and an upper revolving unit installed on the traveling device with the revolving device interposed therebetween, a lower boom member pin-connected to the upper revolving unit, and a lower boom member. A crane boom having a tether boom member and an upper boom member coupled to the tether boom member; and a first winch device disposed between the upper swing body and the crane boom to lower the crane boom. A front frame having a lower front frame having a lower end pin-connected to the lower boom member and an upper front frame fixed to the upper end of the lower front frame; and a lower boom member arranged to lower the front frame. A second winch device, a third winch device on the upper slewing body, and a third winch disposed through the upper front frame. And Keriba was suspended in the apparatus of the rope, and a bucket supported on Keriba.

However, in the excavator of the present invention, the front frame is
The lower front frame is formed by connecting a plurality of front frame members, and when all of these front frame members are connected, a space required for mounting a bucket for excavating the expanded portion of the hole for the expanded pile is provided. ,
When a part of the front frame member is removed, a space necessary for a bucket for excavating the shaft portion of the hole for the expanded bottom pile is formed.

In the excavator of the present invention, the lower front frame includes:
For example, it is composed of three front frame members connected in a row, and when all of the front frame members are connected, the front frame member located at the center is attached to a bucket that excavates the expanded portion of the hole for the expanded pile. When removed, a space for a bucket for excavating the shaft portion of the hole for the expanded pile is formed below the upper front frame.

[Action]

In the excavator with a hole for a bottom pile according to the present invention, the number of members constituting the front frame is increased or decreased, for example, by attaching / detaching the front frame member located at the center of the front frame, thereby increasing the bottom portion excavating bucket and the shaft portion. Since the space necessary for mounting the excavating bucket can be obtained at the lower portion of the upper front frame, the excavation of the shaft portion and the expanded portion can be performed by one machine. Then, when the bucket for excavating the bottom portion is mounted, by removing a part of the front frame in the same manner as in the case of the bucket for excavating the shaft portion, the size can be reduced to a size within the transport limit. Transportation can be performed without removing the frame from the crane boom.

When the length of the lower front frame is changed for each bucket, the excavator of the present invention raises the crane boom and the front frame and turns the kelever vertically. Between the upper front frame and the lower front frame so that the front frame causes the upper front frame to rotate at each of the removal and connection of the front frame members and to secure the upper front frame at each rotational position. When the length of the lower front frame is changed by releasing the upper front frame when the length of the lower front frame is changed and the front frame is raised, the upper front frame rotates. Since the keriba can be turned vertically, the space for each of the buckets can be formed below the upper front frame with almost no change in the elevation angle of the crane boom. When requesting a radius, Even when the distance between the pivot axis and Keriba of the upper frame is different for each bucket, simply by slightly elevating the crane boom, it is possible to perform the working radius of the settings required for each bucket.

Further, in the excavator of the present invention, the second winch device includes a sheave block and a pendant rope in addition to the rope and the sheave block that originally constitute the same, and the additional sheave block is disposed on the crane boom. The pendant rope is provided with connection means for the end of the rope in the second winch device and the upper front frame, so that when the bucket for excavation is mounted, the pendant rope is in the second position. Just by connecting to the original rope that constitutes the winch device, a winch device that elevates the extended lower front frame can be constructed, and when using the shaft part excavation bucket, the pendant rope is connected to the second winch. Simply remove the device from the ropes that make it up, and the shortened lower front It can be obtained winch device against over arm. Moreover, no matter which bucket is used, the second winch device can pull the lower front frame from a substantially right angle direction, so that the front frame can be lowered with less power, and At the time of transportation, the winch device can be disassembled or reassembled simply by removing or attaching the pendant rope.

Still further, the excavator according to the present invention, wherein the lower boom member includes a first retainer for connecting means of the rope in the second winch device and a second retainer for connecting means on the pendant rope, When attaching the excavation bucket to the kelly bar, holding the connecting means at both ends of the rope that originally constitutes the second winch attachment to the first holding tool, and attaching the enlarged bottom excavation bucket to the kerry bar, By holding the connecting means at both ends of the pendant rope by the second holder, one of the ropes can be fixed by the holder, so that the connection and disconnection of the rope can be performed more easily.

Furthermore, in the excavator having these holding tools, the second holding tool is located at a position on the uppermost sheave block of the sheave block that originally constitutes the second winch device and at a position distant therefrom. In addition to being able to easily connect and disconnect the ropes by being attached to the lower boom member so as to make a movement between the Is moved to the former position, it is possible to prevent the rope which originally constitutes the second winch device from coming off the sheave block located at the uppermost portion of the winch device, and it is possible to excavate the expanded bottom portion. When attaching the bucket to the keriba, move the second retainer to the latter position to The rope is wound around a portion of the sheave block is exposed, it is possible to perform hanging off the rope easy to have.

〔Example〕

The drawings show an embodiment of an excavator for a hole for an expanded pile according to the present invention.

As shown in FIG. 1, the excavator includes a work machine main body 11 having a crawler-type traveling device 10. The upper revolving superstructure 12 is attached to a revolving device installed on a traveling underframe constituting the traveling device.

The crane boom 13 includes a lower boom member 13a, a plurality of connecting boom members 13b, and an upper boom member 13c.The lower boom member is pin-coupled to the upper revolving unit, and the winch in which the upper boom member 13c is on the upper revolving unit. Equipment rope 1
It is connected to 4 so that it can perform a lifting movement.

The front frame 15 includes a lower front frame 16 and an upper front frame 17. A lower end of the lower front frame 16 is connected to a lower boom member 13a of the crane boom, and an upper front frame is connected to an upper end of the lower front frame by a pin. Elevation, hydraulic cylinder 18, sheave blocks 19, 20 and rope 21
This is achieved by rotating the lower front frame on the crane boom by a winch device provided on the crane boom 13 including the following. The hydraulic cylinder 18
The case is pin-connected to the bracket 22 fixed to the lower part of the lower boom member 13a, the sheave block 19 is pin-connected to the rod of this hydraulic cylinder, and the sheave block 20 is fixed to the lower boom member 13a of the crane boom 13. I have. The rope 21 has both ends connected to a holder 29 provided on the upper front frame 17, and has a middle portion wound around sheaves provided in sheave blocks 19 and 20.

Keriba 23 is suspended at the upper end thereof via a swivel joint from a rope of a main wind winch device provided in the work machine main body 11, and the lower end thereof penetrates the upper front frame 17 and is rotated by a driving device incorporated in the upper front frame. Have been.

A bucket 25 is attached to the lower end of the kerryba 23. The bucket itself is for excavating the enlarged bottom portion of the enlarged pile hole. For example, as disclosed in Japanese Patent Publication No. 62-45954, this bucket moves a wing having a cutter and a scraper in an interlocking manner, and when excavating, the wing is pushed out by a hydraulic cylinder. , The scraper is pushed out in conjunction with
Forming a guideway for earth and sand for the bucket, so that the excavated earth and sand in the vertical part of the expanded part of the hole for the expanded pile is drawn into the inside of the body, and when the wing is pulled in, the scraper is also pulled in, and the body is drawn in. This is to prevent the earth and sand taken inside from escaping.

The stabilizer 26 for the bucket 25 is
Is fitted and fixed to a portion located above the bucket. The center joint 27 is for connecting a hydraulic drive device in the work machine body 11 to a hydraulic device of a bottom-hole drilling bucket, is supported by the upper front frame 17, and is connected to these by a hydraulic hose. ing. The reel device 28 is for winding an electric cable that connects a sensor on a hydraulic hose or a bucket with a digging opening meter or the like in the work machine main body, and is disposed between the center joint 27 and the bucket 25. At the same time, it is supported by the upper front frame 17.

In the excavator according to the present invention, the bucket 25, together with the stabilizer 26, is a standard earth drill bucket for excavating the shaft portion in the hole for the expanded bottom pile as shown in FIG.
It can be exchanged for 34.

For this purpose, the lower front frame 16 is composed of a plurality of frame members, and a space for mounting each bucket can be formed below the upper front frame by detaching and attaching a part of the frame members. Are allowed to do so. More specifically, the lower front frame includes an upper frame member 31, a middle frame member 32, and a lower frame member 33, as shown in FIG. These frame members are arranged in a line and are connected to each other by bolts. The upper frame member 31 is connected to the upper front frame 17 and the lower frame member 33 is connected to the lower boom member 13a of the crane boom. Each of the frame members is provided with a length such that when all are connected, a space is provided between the upper front frame 17 and the ground, where the bottom part excavating bucket 25 can be placed. With the second
As shown in the figure, when the middle frame member 32 is removed and the upper frame member 31 and the lower frame member 33 are directly connected, the shaft portion excavation bucket 34 is moved between the upper front frame and the ground. A lower boom member 13a of the crane boom that forms a space in which the
To have a length associated with it.

This excavator is self-propelled to the excavation site when excavating a hole for an expanded pile, placed at the excavation site so that the keriba 23 is vertical, and hydraulic hoses and signal cables are connected to related equipment in the bucket. Connected. The excavation is performed by first excavating the shaft portion in the hole for the expanded pile by the bucket 34, and then excavating the expanded portion by the bucket 25.

In the excavation of the shaft portion, as shown in FIG. 2, the middle frame member 32 is removed from the lower front frame 16 and the upper frame member 31 and the lower frame member 33 are directly connected to each other. At the same time, secure the height to the bucket 34, attach the bucket 34 to the keriba 23, rotate the crane boom and the front frame to turn the keriba vertically, set the working radius R for this bucket, and then This is performed by driving the 23 and rotating and lowering the bucket 34.

For excavation of the expanded bottom part, the bucket 34 for excavating the shaft part is removed from the keriba 23 and the middle frame member 32 is attached to the lower frame member 33.
And the upper frame member 31 is connected to form a height corresponding to the bucket 25 for excavating the bottom-extended portion.Then, the bucket 25 is attached to the kelly bar 23, the crane boom and the front frame are rotated, and the kelly bar is moved in the vertical direction. And after setting the working radius r, lower the bucket 25 to the bottom of the hole drilled by the bucket 34,
This is done by rotating 23 and pushing out the wings of bucket 25.

Disassembly, after removing the bucket and the connecting boom member and the upper boom member in the crane boom,
As with the shaft part excavation bucket, the middle frame member
This is done by removing the upper frame member 31 and connecting the lower frame member to the lower frame member 31.
The excavator can be sized to be mounted on a vehicle without removing the front frame.

In this excavator, further, the upper front frame 17 is swingably attached to the lower front frame 16, and the crane boom 13 is rotated by rotating the upper front frame 17 with the crane boom 13 being lowered. Just by changing the elevation angle slightly, the Keriva 23 is turned vertically so that the working radius for each of the buckets can be set.
The load on the crane boom is not increased.

3 and 4 show details of the connection between the upper front frame and the lower front frame. The upper front frame 17 is arranged between side walls extending from the upper end of the upper frame member 31, and is connected by pins 49.

The link 36 is attached to the lower frame member so that it can rotate about the pin 35. Pin 35
The side wall and the inner wall of the upper frame member 31 are penetrated and fixed to these walls. The link itself consists of two members arranged in parallel,
An axle member 38 is fixed to a side surface of one of the members while being connected by a member 37 disposed therebetween. Attachment to the pin 35 is performed by projecting an end of the upper frame member 31 from the opening 39 in the side wall of the upper frame member 31 to place the link 36 inside the upper frame member 31, and attaching the bearing member 37 to the pin 35 and the axle. This is achieved by holding the member 38 on the bearing member 40 on the partition wall.

An end of the link 36 located inside the upper frame member 31 is an extension 41 of the upper front frame 17.
Are connected by pins 42. However, the pin 42 is connected to the rod of the hydraulic cylinder 43, and can be inserted into or removed from a pin hole in the link and the extension by contracting the cylinder rod. A rod 44 is fixed to a member supporting the pin 42. The rod 44 has an opposite end inserted into the side wall of the upper frame member 31 to guide the pin 42 to move linearly and to link the pin 42
When exiting from 36 and extension 41, the end protrudes from the side wall of the upper frame member,
When the pin 42 is inserted, it is pulled into the side wall so that the connection state between the link 36 and the extension 41 can be checked from the outside. Note that the hydraulic cylinder 43 is supported by a base having a cylinder case fixed to the axle member 38.

Connecting members 45 are arranged on both sides of the end of the link 36 projecting from the opening 39 of the upper frame member.
These connecting members are fixed to the upper frame member 31. Two pin holes 47, 48 are coaxially provided in each of the connecting members. The ends of the links 36 are located between the connecting members 45 and are connected by pins 46 to one of the pin holes in these connecting members. For example, pin hole 47
Is, when all the frame members 31-33 are connected,
That is, when the bucket for excavating the bottom portion is mounted on the kelly bar, the bucket is connected to the link 36 by the pin 46,
When the middle frame member 32 is removed from the lower front frame and the upper frame member 31 and the lower frame member 33 are directly connected, that is, when the shaft portion excavating bucket is attached to the Is pin-connected.

The setting of the working radius required for mounting the shaft part excavating bucket is performed by rotating the crane boom 13 and the front frame 15 to a predetermined elevation angle, then operating the hydraulic cylinder 43, pulling out the pin 42, connecting the link 36 and the connection. Pin from member 45
By pulling out 46, the upper front frame 17
Rotated about 49, the keriba can be moved to the position of the working radius R and pointed vertically. At this time, the pin hole of the link 36 matches the pin hole 48 of the connecting member,
Since the pin hole of the extension 41 matches the pin hole of the link 36, the link 36 and the connecting member 45 are connected by the pin 46, and the hydraulic cylinder 43 is operated to connect the link 36 and the extension 41 by the pin 46. Thereby, the upper front frame 17 is fixed, and the position of the keriba 23 can also be fixed.

Further, the lowering of the lower front frame 16 can be performed by the same winch device even when the bucket is replaced. To this end, the winch device for raising the front frame is provided with a third sheave block and a pendant rope, and two holders for these ropes are attached to the lower boom member 13a of the crane boom. . FIG. 5 shows the area around the third sheave block in the winch device.

The sheave block 52 is installed on the lower boom member 13a of the crane boom 13 so as to be at a position corresponding to the holder 29 when all the frame members are connected. There are two pendant ropes 51, each having a thimble 53, 54 at each end of each rope. The thimble 53 of each pendant rope 51 is connected to a rope socket 55 at both ends of the rope 21, and the thimble 54 is connected to a holder 29 on the upper front frame 17.

Figure 7 shows ropes 21 for sheave blocks 19, 20, and 52
And a state in which the pendant rope 51 is wound. The sheave blocks 19 and 52 have, for example, two sheaves, and the sheave block 20 has, for example, three sheaves. As shown by the solid line in FIG. 7, the ropes 21 and 51 are connected to the sheave 52a of the sheave block 52 and the sheave block 20 of the sheave block 20 after one thimble 54 of the rope 51 is fixed to the holder 29 in the upper front frame 17. Via sheave 20a and sheave 19a of sheave block 19,
Wound around sheave 20b of sheave block 20, then sheave block 19 of sheave block 19, sheave block 20
Another thimble 54 is fixed to the holder 29 of the upper front frame through the sheave 20c of the sheave and the sheave 52b of the sheave block 52.

The holder 60 is for fixing the pendant rope when the pendant rope 51 is not used, and is provided on the lower boom member 13a of the crane boom. The holder itself has a main body having two plate members 63 arranged in parallel and a substrate 64 to which these plate members are fixed. The board is fixed to the crane boom 13, pin holes are provided coaxially in the plate member 63, and pins 65 are inserted into these pin holes. The rope is fixed on the upper front frame
Thimble removed from retainer 29 and rope 21 at 17
This is achieved by disposing 53 and 54 between the plate members 63 and inserting pins into the pin holes of the thimble and the plate member.

The holding tool 61 is used when connecting and disconnecting the rope 21 and the pendant rope 51, and is attached to the lower boom member 13a of the crane boom 13. The holder itself, as best shown in FIG.
It has a base 66 and a stay 67. Base
66 is located at the top of sheave block 20 and is a boom member
It is located at 13a. The stay 67 has a rope socket 68 at one end, and the other end is connected to the base 66 by a pin 69. With this pin as a center, a horizontal position that covers the vertical position shown by a solid line and the sheave block 20 shown by a chain line. Rotation between position can be made. The stay 67 has two pin holes 71 and 72, and a pin hole is also provided in the base. When the stay is in the vertical position, the pin hole 71 of the stay is provided.
By inserting the pin 74 into the pin hole of the base and the base, and by inserting the pin 74 into the pin hole 72 of the stay and the pin hole of the base when the stay 67 is lowered horizontally. The stay can be fixed at each position.

FIG. 8 shows a state of replacement of buckets in the excavator. When excavation of the shaft portion is completed, the upper front frame 17 is at the position d. Bucket for excavation
When replacing with 25, the hydraulic cylinder 18 is operated, the sheave block 19 is lowered, the rope 21 is changed in length from D to E, and the upper front frame 17 is moved from position d to position c. Next, the rope 21 is separated from the upper front frame 17, the stay 67 is raised to the vertical position, and the rope socket 55 of the rope 21 is attached to the rope socket 68 of the stay.
And remove the pendant rope 51 from the holder 60,
Connect the thimble 53 to the rope socket 55 of the rope 21 and connect the thimble 54 to the holder of the upper front frame 17.
By connecting it to 29, the ropes 21 and 51 are wound around. Then, the middle frame member 32 is connected between the upper frame member 31 and the lower frame member 33, and the upper front frame 17 is raised to the position b. then,
The cylinder rod of the hydraulic cylinder 18 is extended, the pendant rope 51 is moved by a distance A, the lower front frame 16 is made to swing, the pendant rope 51 is extended from the distance C to B, and the upper front frame 17 is extended. By moving from the position b to the position a, it is possible to obtain a space necessary for mounting the bucket for excavating the bottom-extended portion.

In this state, the replacement with the shaft portion excavation bucket 34 is started by contracting the rod of the hydraulic cylinder 18. When the rod contracts, the rope socket 55
Moves the length A, the rope socket 54 moves, the lower front frame 16 swings, and the upper front frame 17 moves from the position a to the position b. after this,
The middle frame member 32 constituting the lower front frame
Is removed, and the upper frame member 31 and the lower frame member 33 are directly connected. This moves the upper front frame 17 to the position c. Then, the pendant rope 51 is detached from the rope 21, the thimble 54 is detached from the holder 29 on the upper front frame, and the rope socket 55 of the rope 21 is connected to this holder. Then, the stay 21 is set so that the rope 21 does not come off from the sheave of the sheave block 20, and the thimble 54 of the pendant rope 51 is connected to the holder 60 on the crane boom 13. In this way, after the rope has been wound around, the cylinder rod of the hydraulic cylinder 18 is extended, the sheave block 19 is raised in the distance F, and the lower front frame 16 is rocked. The upper front frame 17 can be moved to a position d related to the height of the partial excavation bucket 34.

Replace these buckets with a pendant rope
Since the winch device for each bucket can be constituted only by attaching and detaching the 51, the replacement work can be performed quickly and easily, and the sheave blocks 52, 20 in each winch device are provided with the respective holding members. It is located at a position corresponding to 29 and can be made by pulling the front frame upward from a substantially perpendicular direction, so that the front frame can be lowered with less power. In addition, pendant rope
When the rope 51 is removed from the rope 21, the rope socket 55 of the rope 21 is
The rope can be fixed easily, making it easier to separate the rope.After the connection is completed, the stay can be lowered to the horizontal position to prevent the rope 21 from coming off the sheave block 20. it can. When the pendant rope 51 and the rope 21 are connected, the stay 67 is set in the vertical position, so that the upper part of the sheave in the sheave block 20 is exposed, so that the rope 21 can be easily removed from the sheave block 20. By attaching the removed rope socket 55 to the rope socket 68, the rope 21 is fixed, so that the connection operation can be easily performed at this time as well.

Also, the disassembly during transportation is performed by the shaft part excavation bucket.
This can be done by working in the same way as when replacing the 34. Since the excavating operation is performed by excavating the widened portion, the upper front frame 17 is at the position a when disassembly is performed. The cylinder rod of the hydraulic cylinder 18 is contracted, the socket 55 of the rope 21 is moved by the length A, and the upper front frame 17 is moved from the position a to the position b. Thereafter, the middle frame member 32 is removed from the lower front frame, and the upper frame member 31 and the lower frame member 32 are removed.
33, and the upper front frame 17 is moved to the position c. Then, the pendant rope 51 is separated from the rope 21, the thimble 54 of the pendant rope is detached from the holder 29 of the upper front frame, the rope socket 55 of the rope 21 is connected to the holder, and the stay 67 is pushed down, and the rope 21 is lowered. Make sure that it does not come off the sheave of the sheave block 20 and the pendant rope 51
Is connected to the holder 60, and by removing the connecting boom member 13b and the upper boom member 13c of the crane boom,
Disassembly can be completed.

〔The invention's effect〕

As described above, the excavator for a hole for an expanded pile according to the present invention is configured such that the lower front frame is configured by connecting a plurality of front frame members. The space required to mount the bucket for excavating the bottom of the hole for drilling is formed to be the space required for the bucket for drilling the shaft of the hole for the bottom pile when some of the front frame members are removed. In addition, the excavation of the expanded bottom portion and the excavation of the shaft portion can be performed by one machine, and a part of the front frame member is removed to make the front frame a transportable length. Drilling and drilling before and after drilling holes for expanded piles with much less time and effort compared to conventional excavators. And reassembly can be performed.

[Brief description of the drawings]

The drawings show an embodiment of the excavator of the present invention, FIG. 1 is a side view showing the entire configuration, FIG. 2 is a side view showing the entire configuration in another working state, and FIG. 3 is FIG. FIG. 3 is an enlarged view of a part around the connecting portion between the lower front frame and the upper front frame, taken along line III-III. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3, and FIG. An enlarged view showing a partial configuration of a winch device for raising
FIG. 6 is an enlarged view around the stay in FIG. 5, FIG. 7 is an explanatory view showing a rope wrapping state around a sheave in the winch device, and FIG. 8 is an explanatory view showing a use state. 10: Traveling device, 11: Work machine body, 12: Upper revolving unit, 13 ...
Crane boom, 14 ... first winch device, 16 ... lower front frame, 17 ... upper front frame, 18-22 ...
A third winch device, 23 ... Keliva, 25 ... A bottom part excavating bucket, 31-33 ... Frame member, 34 ... Axle part excavating bucket.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21B 19/02 E21B 15/00 E21B 7/28

Claims (9)

(57) [Claims] 1. A work machine main body having a traveling device, an upper revolving superstructure mounted on the traveling device via a revolving device, a lower boom member pin-connected to the upper revolving superstructure, and a lower boom member. A crane boom having a connecting boom member and an upper boom member coupled to the boom member, a first winch device disposed on the upper revolving unit for raising the crane boom, and a lower boom member. In order to lower the front frame with a front frame with a lower front frame with a lower end pin-connected and an upper front frame fixed to the upper end of the lower front frame,
A second winch device disposed on the lower boom member, a third winch device on the upper swing body, and a keriba disposed through the upper front frame and suspended on a rope of the third winch device, An earth drill excavator comprising a bucket supported by a keriba, a lower front frame is formed by connecting a plurality of front frame members, and when all of the front frame members are connected, a hole for an expanded bottom pile is formed. The space required for mounting the bucket for excavating the bottom-enlarged portion is increased by removing the space required for the bucket for excavating the shaft portion of the hole for the bottom-extended pile when a part of the front frame member is removed. An excavator for a hole for an expanded pile, characterized in that the excavator is formed in a hole. 2. A lower front frame comprising three front frame members joined in a row, and a bucket for excavating an enlarged portion of an enlarged pile hole when all of the front frame members are connected. 2. A space for mounting a bucket for digging a shaft portion of the hole for the expanded bottom pile when the front frame member located in the center is removed, Excavator. 3. An upper front frame and a lower front frame for rotating the upper front frame in each of removing and connecting the front frame members and for securing the upper front frame in each of the rotational positions. 2. The excavator of claim 1, further comprising a connection mechanism disposed between the bottom and the bottom. 4. A link mechanism in the front frame, wherein a link is disposed inside the lower front frame with one end protruding from an opening in the lower front frame and is rotatably supported by the lower front frame, and a projecting end of the link. A connecting member provided on the lower front frame facing the first member, one of two pin holes on the member and the connecting member on the upper front frame pin-connected to the link, and one pin hole on the projecting end of the link. 4. The excavator for a hole for an expanded pile according to claim 3, further comprising a pin for connecting the hole and the hole. 5. A connection between the link and a member on the upper front frame relates to a pin insertable into a pin hole in the link and the upper front frame, a hydraulic cylinder for attaching and detaching the pin to and from the pin hole, and detachment of the pin. The excavator according to claim 4, further comprising a member that moves together with the pin so as to protrude and retract from the outside of the upper front frame. 6. A second winch device having a sheave block and a pendant rope in addition to a rope and a sheave block constituting the same, wherein the additional sheave block is disposed on the crane boom, and the pendant rope is connected to the end of the rope. Having a connecting means for the upper part and the upper front frame, and when the length of the lower front frame is changed with respect to the bucket for excavating the bottom part, the sheave block and the rope and the pendant rope in the second winch device are combined into one winch. The excavator for a hole for an expanded pile according to claim 1, which constitutes an apparatus. 7. The excavator according to claim 6, wherein the additional sheave block is fixed to a lower boom member of the crane boom. 8. The lower boom member includes a first retainer for connecting a rope in a second winch device and a second retainer for connecting a connector on a pendant rope. When attached to the first winch while holding the connection means at both ends of the rope that originally constitutes the second winch device, and when mounting the bottom excavating bucket to the Keriba, The excavator according to claim 6, wherein the connecting means at both ends of the pendant rope are held by the second holder. 9. A second holding device moves between a position on the uppermost sheave block of the sheave block originally constituting the second winch device and a position farther from the uppermost sheave block. 9. The rope according to claim 8, wherein the rope, which is originally attached to the lower boom member and when in the former position, prevents the rope originally constituting the second winch device from coming off the sheave block at the top. Drilling machine for hole for expanded pile.