JPH02300493A - Excavator of pit for bottom-expanding pile - Google Patents

Abstract

PURPOSE:To share an excavator by installing a front frame, to which a plurality of members are connected, to an earth drill excavator, varying the connection length of the front frame and forming a space for mounting a bottom-expanding section excavating bucket or a shaft-section excavating bucket. CONSTITUTION:A crane boom 13 is mounted to the upper revolving superstructure 12 of a working machine. A front frame 15 in which a lower front frame 16 and an upper front frame 17 are bonded by a pin is formed, and connected to the base section of the boom 13 in a tipping-free manner. The frame 16 is composed of an upper frame 21, an intermediate frame 32 and a lower frame 33. A rotated driven kelly-bar 23 is set up, and a bottom-expanding section excavating bucket 25 is installed. The frame 32 is removed and a space proper to the mounting of a bucket 3d for shaft section excavation is shaped, or transportable length is acquired. Accordingly, the excavator can be transported easily, and the buckets can be exchanged in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an earth drill excavator, and more particularly to an improvement in an excavator for drilling a hole for an enlarged pile.

[Conventional technology]

In this type of excavator, the excavator that excavates the bottom-expanded portion of the bottom-expanded pile hole includes a work machine main body, a crane boom, a front frame, and a kely bar.

The main body of the work machine consists of a crawler-type traveling device with a rotating upper structure interposed therebetween. The crane boom is composed of a lower boom member, a bridge boom member, and an upper boom member, and the lower boom member is connected to the upper rotating structure by a pin and can be raised and lowered by a first winch device located on the upper rotating structure. I am made to be able to do it. The front frame consists of a lower front frame and an upper front frame. The lower front frame is pin-coupled to the crane boom at its lower end and is enabled to be lifted up and down on the crane boom by a second winch device disposed between the lower front frame and the crane boom. The upper front frame is fixed to the upper end of the lower front frame. The Keliva is suspended from the rope of the third winch device on the upper revolving body via a swivel joint, and is held by a drive mechanism built into the upper front frame, and can be rotated by this drive mechanism. can. The bucket is attached to the part that extends downward from the upper front frame along with the stabilizer, and there is a rotary pipe joint for the hydraulic hose that connects the hydraulic equipment in the bucket and the hydraulic drive device on the upper revolving structure, a drive mechanism that rotates the Kerry bar, a hydraulic hose, A signal cable winding device and the like are supported by the upper front frame.

An excavator for excavating the shaft portion of the hole for the bottom-expanding pile is similarly configured. However, the bucket is made of the standard for earth drills, and equipment for expanding the bottom such as a winding device or stabilizer is not installed.

To excavate, first set up the excavator with the shaft excavation bucket installed at the excavation site, raise the front frame upward,
After aligning the excavation position with the bucket, the bucket is lowered and rotated by the Kerry bar to excavate the shaft of the hole for the expanded pile.Then, the excavator is retreated and the expanded portion is removed. This is done by replacing the excavator with an excavator with an excavating bucket and aligning the center, then lowering the bucket to the bottom of the hole excavated by the shaft excavating bucket, and letting the bucket excavate the expanded bottom part.

[Problem to be solved by the invention]

With conventional excavators, not only do you have to replace the excavator to drill holes for expanded piles, but also
Prior to excavation, connect the anchoring boom member and the upper boom member, wrap the rope of the winch device that raises and lowers the crane boom, connect the front frame to the lower boom member, and connect the rope between the crane boom and the front frame. The rope of the installed winch equipment must be wrapped around the sheave block for assembly, and after excavation the work must be reversed and disassembled, which requires considerable effort before and after construction. need.

According to the present invention, it is possible to excavate the shaft portion of a hole for an expanded bottom pile, and furthermore, one disassembly and reassembly can be easily and quickly performed. An improved drilling machine for drilling holes for expanding piles is provided.

[Means to solve the problem]

This excavator includes a work equipment main body having a traveling device and an upper revolving body installed on the traveling device via a rotating device, a lower boom member connected to the upper revolving body with a pin, and a lower boom member connected to the lower boom member. a crane boom having a tether boom member and an upper boom member coupled to the tether boom member; a first winch device disposed between an upper revolving structure and the crane boom for raising and lowering the crane boom; ,
A front frame has a lower front frame whose lower end is pin-connected to the lower boom member, an upper front frame fixed to the upper end of the lower front frame, and a front frame arranged on the lower boom member so as to allow the front frame to tilt upward and downward. a second winch device, a third winch device on the upper revolving body, a kelly bar disposed through the upper front frame and suspended from a rope of the third winch device, and a bucket supported by the kelly bar. Equipped with:

However, in the excavator of the present invention, the front frame is constructed by connecting a plurality of front frame members to the lower front frame, and when all of these front frame members are connected, the bottom enlarged portion of the hole for the bottom pile The feature is that when some front frame members are removed, the space necessary for attaching the bucket to excavate the hole for the expanded pile is formed in the shaft part of the hole for the expanded pile. It is said that

In the excavator of the present invention, the lower front frame is composed of, for example, three front frame members connected in a row, and when all of the front frame members are connected, the expanded bottom part of the expanded bottom pile hole is excavated. bucket,
When the front frame member located at the center is removed, a space is formed below the upper front frame for a bucket for excavating the shaft portion of the expanded-bottom pile hole.

[For production]

In the excavator for an expanded bottom pile hole of the present invention, by increasing or decreasing the members constituting the front frame, for example, by attaching and detaching the front frame member located at the center of the front frame, the bucket for expanding the bottom part excavation and the shaft part can be adjusted. Since the necessary space for mounting the excavation bucket can be obtained in the lower part of the upper front frame, it is possible to excavate the shaft part and the expanded bottom part with one machine. When the expanded-bottom excavation bucket is installed, the size can be reduced to within the transport limit by removing part of the front frame in the same way as with the shaft-excavation bucket, so the front without removing the frame from the crane boom.
You can send @.

In the excavator of the present invention, when changing the length of the lower front frame for each bucket, the crane boom and the front frame are lifted up and the Kerry bar is directed vertically. wherein the front frame is arranged such that the upper front frame and the lower front frame are connected to each other in order to allow the upper front frame to rotate upon each of the removal and connection of the front frame members, and to fix the front frame in part in each rotational position. When the length of the lower front frame is changed, the upper front frame can be fixed to the can be rotated to orient the Kerry bar vertically, so it is possible to create a space for each of the buckets under the two-part front frame without changing the elevation angle of the crane boom. Even when each bucket requires a different working radius, i.e. when the distance between the pivot axis of the superstructure and the Kelly bar is different for each bucket, the crane boom can be raised and raised slightly. , you can set the required working radius for each bucket.

Further, in the excavator of the present invention, the second winch device is provided with a sheave block and a pendant rope in addition to the rope and sheave block that originally constitute the second winch device, and the additional sheave block is disposed on the crane boom. so that the pendant rope has a connection between the end of the rope on the second winch device and the upper front frame, so that the pendant rope can be attached to the second winch when the expanded section excavation bucket is installed. Simply connect to the original rope that makes up the winch device.
It is possible to configure a winch device that raises and raises the extended lower front frame, and when using a bucket for excavating the shaft part, the pendant rope can be shortened by simply removing the pendant rope from the rope that originally constitutes the second winch device. A winch device for the lower front frame can be obtained. Moreover, no matter which bucket is used, the second winch device can pull the lower front frame from an almost perpendicular direction, making it possible to raise and lower the front frame with less power. Even during transportation, the winch device can be disassembled or reassembled simply by removing or attaching the pendant rope.

Furthermore, the excavator of the present invention is characterized in that the lower boom member comprises a first retainer for the connection means of the rope in the second winch device and a second retainer for the connection means on the pendant rope, and the shaft portion When attaching the excavation bucket to the Kellyba, the connection means at both ends of the rope that originally constitutes the attachment of the second winch are held in the first holder, and when the expanded bottom part excavation bucket is attached to the Kellyba. By holding the connecting means at both ends of the pendant rope in the second holder, one rope can be fixed by the holder, making it easier to connect and disconnect the ropes. .

Furthermore, in an excavator equipped with these holders, the second holder is located at a position on the top of the sheave block that originally constitutes the second winch device and at a position away from the top of the sheave block. by being attached to the lower boom member for movement between the
In addition to the ease of connecting and disconnecting the ropes, when attaching the shank excavation bucket to the Kerry bar, the second winch device is originally configured by moving the second retainer to the former position. The winch rope can be prevented from coming off the sheave block located at the top of the winch device,
By moving the second holder to the latter position when attaching the expanded bottom excavation bucket to the Kelly bar, the part of the sheave block located at the top where the rope is wrapped is exposed, and the rope is wrapped around the sheave block. The hook can be easily removed.

〔Example〕

The drawing shows an embodiment of an excavator for an enlarged pile hole according to the present invention. As shown in FIG. . The upper revolving body 12 is attached to a revolving device installed on a traveling underframe that constitutes a traveling device.

The crane boom 13 is composed of a lower boom member 13a, a plurality of connecting boom members 13b, and an upper boom member 13c. At the same time, it is connected to a rope 14 of a winch device on the upper revolving body, so that it can perform upward and downward movements.

The front frame 15 includes a lower front frame 16 and an upper front frame 17.

The lower end of the lower front frame 16 is connected to the lower boom member 13a of the crane boom, and the upper front frame is connected to the upper end of the lower front frame by pins. Elevation is carried out by hydraulic cylinder 18. Crane boom 13 including sheave block 19.20 and rope 21
This is achieved by rotating the lower front frame on the crane boom using a winch device located in the crane. The hydraulic cylinder 18 connects the case to the lower boom member 13.
The sheave block 19 is connected with a pin to a bracket 22 fixed to the lower part of the crane boom 1, and the sheave block 19 is connected with a pin to the rond of this hydraulic cylinder.
3 is fixed to the lower boom member 13a. rope 21
is a retainer 29 whose both ends are on the upper front frame 17.
The hook is passed through a sheave which is connected to the jib block 19 and whose intermediate part is in the jib block 19.20.

The Kerry bar 23 has an upper end suspended from a rope of the main winch device located on the main body 11 of the work machine via a swivel joint, a lower end passing through the upper front frame 17, and is rotated by a drive device built into the upper front frame. I'm forced to.

A bucket 25 is attached to the lower end of the Kelly bar 23. The bucket itself is for excavating the expanded portion of the expanded pile hole. For example, as disclosed in Japanese Patent Publication No. 62-45954, this bucket has a wing having a cutter and a scraper that move in conjunction with each other, and when excavating, the wing is pushed out by a hydraulic cylinder. , the scraper is pushed out in conjunction to form a guide path for the earth and sand to the bucket, allowing the excavated earth and sand in the vertical part of the expanded bottom part of the expanded pile hole to be guided into the main body, and when the wing is retracted, The scraper is also retracted in conjunction to prevent the dirt and sand that has been taken into the main body from escaping.

A stabilizer 26 for the bucket 25 is tightly fitted and fixed to a portion of the Kelly bar 23 located above the bucket. The center joint 27 is for connecting the hydraulic drive device in the work machine main body 11 and the hydraulic equipment of the bucket for drilling an expanded bottom hole, and is supported by the upper front frame 17 and connected to these by a hydraulic hose. has been done. The reel device 28 is arranged between the center joint 27 and the bucket 25 and is used to wind up an electric cable that connects the hydraulic hose or the sensor on the bucket to the excavation angle gauge on the work machine body. At the same time, the upper front frame 17
is supported by

In the excavator according to the present invention, the bucket 25, together with the stabilizer 26, can be replaced with a standard earth drill bucket 34 for drilling the shaft portion of an expanded pile hole, as shown in FIG. There is.

For this purpose, the lower front frame 16 is composed of a plurality of frame members, and by removing and attaching some of the frame members, a space for attaching each bucket can be formed below the upper front frame. I am made to be able to do it.

More specifically, the lower front frame is composed of 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 row and are connected to each other by bolts, with the upper frame member 31 being connected to the upper front frame 17, and the lower frame member 33 being connected to the lower boom member 13a of the crane boom.

Each of the frame members is given a length such that, when all are connected, they form a space between the upper front frame 17 and the ground in which an enlarged bottom excavation bucket 25 can be placed. At the same time, as shown in FIG. 2, the middle frame member 32 is removed.

When the upper frame member 31 and the lower frame member 33 are directly connected, a space is formed between the upper front frame and the ground in which the shaft excavation bucket 34 can be placed, and the crane boom The lower boom member 13a has a length associated with the lower boom member 13a at the lower boom member 13a.

When excavating a hole for a bottom-expanding pile, this excavator is driven to the excavation site by itself, and the Kellyva 23 is placed at the excavation site vertically, and related equipment such as hydraulic hoses and signal cables are attached to the bucket. Connected. In the excavation, first, the shaft portion of the bottom-expanding pile hole is excavated using the bucket 34, and then.

This is done by excavating the enlarged portion with a bucket 25.

To excavate 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 lower frame member 33 are directly connected.
The height for the bucket 34 is secured below the upper front frame 17, the bucket 34 is attached to the Kelly bar 23, and the crane boom and front frame are rotated to orient the Kelly bar in the vertical direction, and the working radius R for this bucket is set. This is done by setting and then driving the kely bar 23 to rotate and lower the bucket 34.

To excavate the expanded bottom portion, remove the shaft portion excavation bucket 34 from the Kelly bar 23, connect the middle frame member 32 between the lower frame member 33 and the upper frame member 31, and set the height relative to the expanded bottom portion excavation bucket 25. After the formation, the bucket 25 is attached to the Kelly bar 23, the crane boom and the front frame are rotated, the Kelly bar is made vertical, and the working radius r is set. 25
This is done by lowering the bucket, rotating the Kelly bar 23, and pushing out the wings of the bucket 25.

To disassemble, remove the bucket, remove the connecting boom member and upper boom member of the crane boom, and then remove the middle frame member 3 in the same way as with the shaft excavation bucket.
2 and connecting the upper frame member 31 and the lower frame member. By doing this, the excavator can be made to a size that can be mounted on a vehicle without removing the front frame. .

In this excavator, the upper front frame 17 is further swingably attached to the lower front frame 16, and as the crane boom 13 is raised and lowered, the upper front frame 17 is rotated. By just slightly changing the elevation angle, the Kerryva 2
3 is oriented vertically, and the working radius for each bucket can be set, so that even if the buckets are replaced, the load on the crane boom does not increase.

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

Link 36 is attached to the lower frame member for rotation about pin 35.

The pin 35 passes through the side wall and inner wall of the upper frame member 31 and is fixed to these walls. The link itself consists of two parallel members, connected by a member 37 placed between them, and having an axle member 38 fixed to the side of one of the members. Attachment to the pin 35 involves placing the link inside the upper frame member 31 with the end projecting outward from the opening 39 in the side wall of the upper frame member 31, and attaching the bearing member 37 to the pin 35 to the axle member. 38 is held by a bearing member 4o on the partition wall.

An end of the link 36 located inside the upper frame member 31 is connected to an extension 41 of the upper front frame 17 by a pin 42 .

However, the pin 42 is connected to a rod of a hydraulic cylinder 43, and can be inserted into or removed from the pin hole in the link and extension by contracting the cylinder rod. A rod 44 is fixed to the member that supports the pin 42. The opposite end of the rod 44 is inserted into the side wall of the upper frame member 31 and guides the pin 42 to move linearly, and when the pin 42 is removed from the link 36 and the extension 41. , the end protrudes from the side wall of the upper frame member, and is pulled into the side wall when the pin 42 is inserted, so that the state of connection between the link 36 and the extension 42 can be confirmed from the outside. ing. Note that the hydraulic cylinder 43 has a cylinder case supported by a stand fixed to the axle member 38.

Connecting members 45 are arranged on both sides of the end of the link 36 that projects from the opening 39 of the upper frame member. These connecting members are fixed to the upper frame member 31. Each connecting member has two pin holes 47.48
are installed coaxially. The ends of the links 36 are arranged between connecting members 45 and are connected by pins 46 to one of the pin holes in these connecting members. For example, the pin holes 47 are provided in all frame members 31 to 3.
3 is connected, that is, when the bucket for expanding bottom part excavation is attached to the Kelly bar, the pin 46 is attached to the link 36.
The pin holes 48 are connected by the middle frame member 32.
is removed from the lower front frame and is pinned to the link 36 when the upper frame member 31 and lower frame member 33 are directly connected, i.e. when the shaft excavation bucket is attached to the Kelly bar.

To set the working radius required for attaching the shaft excavation bucket, rotate the crane team 13 and front frame 16 to a predetermined elevation angle, then operate the hydraulic cylinder 43, remove the pin 42, and remove the link 36 and connection. Part 4
By removing the pin 46 from 5, the upper front frame 17 is rotated about the pin 49, and the Kerry bar can be moved to a position with a working radius R and oriented vertically. At this time, the pin hole of the link 36 matches the pin hole 48 of the connecting member, and the pin hole of the extension 42 matches the pin hole of the link 36, so the link 36 and the connecting member 45 are connected by the pin 46, Hydraulic cylinder 43
By operating the link 36 and the extension 42 by the pin 46, the upper front frame 17 is fixed, and the position of the Kelly bar 23 can also be fixed.

Furthermore, the lower front frame 16 can be raised and lowered by the same winch device even if the bucket is replaced. For this purpose, the winch device for raising and lowering the front frame is equipped 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 this winch device.

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

FIG. 7 shows how the rope 21 and pendant rope 51 are wound around the sheave block 19, 20, 52. The sheave blocks 19 and 52 each include, for example, two sheaves, and the sheave block 20 includes, for example, three sheaves. Rope 21.51 is
As shown by the solid line in FIG.
2a, the sheave 20a of the sheave block 20 and the sheave 19a of the sheave block 19 are wound around the sheave 20b of the sheave block 20, and then the sheave 19b of the sheave block 19, the sheave 20c of the sheave block 20, and the sheave block 52 sheave 52b
Another simple 54 is the upper Freon 1.
- It is fixed to the holder 29 of the frame.

The holder 60 is for fixing the pendant rope 51 when it is not in use, and is provided on the lower boom member 13a of the crane boom. The holder itself comprises a body having two parallel plate members 63 and a rib base plate 64 to which these plate members are fixed. The board is fixed to the crane boom 13, pin holes are coaxially provided in the plate member 63, and pins 65 are inserted into these pin holes. The rope is fixed by placing the holder 29 on the upper front frame 17 and the simples 53 and 54 removed from the rope 21 between the plate members 63, and inserting pins into the pin holes of the simples and the plate member. There is.

The holder 61 is used to connect and disconnect the rope 21 and the pendant rope 51.
It is attached to the lower boom member 13a of the crane boom 13. The holder itself consists of a base 66 and a stay 67, as clearly shown in FIG. The base 66 is located above the sheave block 20 and installed on the boom member 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.The stay 67 has a vertical position shown by a solid line and a horizontal position covering the sheave block 20 shown by a chain line, with the pin as the center. Rotations can be made between positions.

The stay 67 has two pin holes 71 and 72.

The base is also provided with a pin hole 73, and when the stay is in the vertical position, by inserting a pin 74 into the pin hole 71 of the stay and the pin hole of the base, the stay 67 can be folded horizontally. By inserting pins 74 into the pin holes 72 of the stay and the pin holes of the base, the stay can be fixed at each position.

FIG. 8 shows the state of bucket replacement in this excavator. When the shaft portion has been excavated, the upper front frame 17 is at position d. When replacing the bucket 25 with the expanded bottom excavation bucket 25, the hydraulic cylinder 18 is operated, the sheave block 19 is lowered, and the rope 21 is connected to the length D.
to E, and move the upper front frame 17 from position d to position C.

Next, the rope 21 is cut off from the upper front frame 17, the stay 67 is raised to the vertical position, and the rope socket 53 of the rope 21 is inserted into the rope socket 68 of the stay.
by connecting the pendant rope 51 to the holder 60, connecting the simple 53 to the rope socket 55 of the rope 21, and connecting the simple 54 to the holder 29 of the upper front frame 17.
1. Perform 51 multiplications. Then, connect the middle frame member 32 between the upper frame member 31 and the lower frame member 33, and position the upper front frame 17.
Raise to b. Then, extend the cylinder rod of the hydraulic cylinder 21 to extend the distance A to the pendant rope 51.
The lower front frame 16 is made to swing, the pendant rope is extended from the distance C to the distance B, and the upper front frame 17 is moved from position [a] to move the bucket for expanding the bottom part excavation. You can get the space you need for installation.

Re-exchange to the bucket for excavating the bottom-expanded portion is started in this state by contracting the rod of the hydraulic cylinder 18. When the rod contracts, the rope socket 5
3 makes a movement of length A, the rope socket 54 moves from position B to position C, and the lower front frame 16
is swung, and the upper front frame 17 moves from position a to position a. Thereafter, the middle frame member 32 constituting the lower front frame is removed, and the upper frame member 31 and lower frame member 33 are directly connected. The upper front frame 17 is thereby moved to position C.

The pendant rope 51 is then removed from the rope 21, the simple 54 is removed 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 61 is folded down to prevent the rope 21 from coming off the sheave of the sheave block 20, and the simple 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 threaded, the cylinder rod of the hydraulic cylinder 18 is contracted, the sheave block 19 is raised by a distance F, and the lower front frame 16 is caused to swing. The upper front frame 17 can be moved to a position d relative to the height of the partial excavation bucket 34.

In replacing these buckets, the pendant rope 5
Since the winch device for each bucket can be configured by simply attaching and detaching the winch device 1, replacement work can be done quickly and easily. 29, and the front frame can be raised or lowered by pulling it from a substantially perpendicular direction, so that the front frame can be raised or lowered with less power. Furthermore, when removing the pendant rope 51 from the rope 21,
The rope socket 55 can be held by the rope socket 68 and the rope 21 can be fixed, so the rope can be easily separated and the stay can be returned to a horizontal position after the connection is completed. By,
It is possible to prevent the rope 21 from coming off the sheave block 20. Also, when connecting the pendant rope 51 and the rope 21, by standing the stay 67 in a vertical position, the upper part of the sheave in the sheave block 20 is exposed, and the rope 21 is connected to the sheave block 20.
1 can be easily removed, and
Since the rope 21 is fixed by attaching the removed rope socket 55 to the rope socket 68, the connection work can be easily performed at this time as well.

In addition, for disassembly during transportation, use the shaft excavation bucket 3.
This can be done by performing the same procedure as when replacing 4. Since the excavation work ends with excavating the bottom-expanded portion, the upper front frame 17 is at position a when one disassembly is performed. The cylinder rod of the hydraulic cylinder 21 is contracted, the socket 55 of the rope 21 is moved by a length A, and the upper front frame 17 is moved from position a to position 1b.
move it to

After this, from the lower front frame to the middle frame member 3
2 and remove the upper frame member 31 and lower frame member 33.
and move the upper front frame 17 to position C. Then, cut off the pendant rope 51 from the rope 21, and
4 from the holder 29 of the upper front frame, connect the rope socket 55 of the rope 21 to this holder, and knock down the stay 61 to prevent the rope 21 from coming off the sheave of the sheave block 20.
The pendant rope 51 is connected to the holder 60, and the tether boom member 13b and the upper boom member 1 of the crane boom are connected.
Decomposition can be completed by removing 3c.

〔Effect of the invention〕

As explained above, the bottom-expanding pile hole excavator of the present invention has the following features:
The lower front frame is constructed by connecting a plurality of front frame members, and when all of these front frame members are connected, it saves the space required to attach a bucket to excavate the expanded part of the expanded pile hole. ,
When some front frame members are removed, the necessary space is created for the bucket that excavates the shaft part of the hole for expanding the bottom pile, so that the drilling of the bottom expansion part and the shaft part are performed with one machine. By removing some of the front frame members, the front frame can be made to a transportable length, which takes much less time and effort than with conventional excavators. Excavation of a hole for an expanded pile, disassembly and reassembly before and after excavation can be performed with labor.

[Brief explanation of drawings]

An end of the drawing shows an embodiment of the excavator of the present invention. Figure 1 is a side view showing the overall configuration, Figure 2 is a side view showing the overall configuration in other working conditions, and Figure 3 is Figure 1 m-■.
Figure 4 is a partially cutaway enlarged view of the joint between the lower front frame and the upper front frame taken along the line, Figure 4 is a cross-sectional view taken along line IV-IV in Figure 3, and Figure 5 is the front frame looking down. FIG. 6 is an enlarged view showing the structure of a part of the winch device; FIG. 6 is an enlarged view of the area around the stay in FIG. 5; FIG. 7 is an explanatory view showing how the rope is wound around the sheave in this winch device; FIG. is an explanatory diagram showing a usage state. 10... Traveling device, 11... Working machine body, 12...
・Upper rotating body, 13...Crane boom, 14...
First winch device, 16... Lower front frame, 17... Upper front frame, 18-22...
Third winch device, 23... Kerryba, 25...
Bucket for excavating the expanded bottom part, 31-33... Frame member, 34... Bucket for excavating the shaft part. Patent applicant Hitachi Construction Machinery Co., Ltd. Representative Patent Attorney Masami Akimoto (1 other person) Figure 1 = r - Figure 2 Figure 5 Figure 7 Valley f9a

Claims (1)

[Scope of Claims] 1. A work machine main body having a traveling device and an upper revolving body installed on the traveling device via a rotating device, a lower boom member connected with a pin to the upper revolving body, and a lower boom member. a crane boom having a connected tether boom member and an upper boom member connected to the boom member; a first winch device disposed on the upper rotating structure for raising and lowering the crane boom; and a lower boom. a front frame having a lower front frame whose lower end is pin-connected to the member; 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 revolving body, and a third winch disposed through the upper front frame in order to allow the front frame to tilt upward and downward. In an earth drilling machine equipped with a kely bar suspended from a rope of the equipment and a bucket supported on the kely bar, the lower front frame is constructed by connecting a plurality of front frame members, and all of the front frame members are When a part of the front frame member is removed, the space required to install the bucket that excavates the expanded bottom part of the expanded bottom pile hole can be removed. An excavator for drilling holes for expanding piles, characterized in that a space necessary for this purpose is formed below the upper front frame. 2. The lower front frame consists of three front frame members connected in a row, and when all the front frame members are connected, there is a space for installing a bucket for excavating the expanded bottom part of the expanded bottom pile hole. 3. The machine for excavating an expanded pile hole according to claim 2, wherein when the centrally located front frame member is removed, a space for mounting a bucket for excavating the shaft portion of the expanded pile hole is formed. 3. The front frame has a space between the upper front frame and the lower front frame to allow rotation of the upper front frame upon each removal and connection of front frame members and to fix the upper front frame in each rotational position. The excavator for an enlarged pile hole according to claim 1, further comprising a connecting mechanism disposed at the bottom of the pile hole excavator. 4. The connecting mechanism in the front frame includes a link disposed inside the lower front frame with one end protruding from an opening in the lower front frame and rotatably supported by the lower front frame, and a link facing the protruding end of the link. a connecting member provided on the lower front frame;
Claim 3, further comprising a member on the upper front frame pin-connected to the ring and a pin connecting one of the two pin holes on the connecting member and one pin hole on the projecting end of the link. Drilling machine for expanding piles. 5. The connection between the link and the member on the upper front frame includes a pin that can be inserted into a pin hole in the link and the upper front frame, a hydraulic cylinder that attaches and detaches the pin to the pin hole, and a hydraulic cylinder that connects the link and the member on the upper front frame to the upper front frame. The drilling machine for expanding a bottom pile hole 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 frame. 6. In addition to the ropes and sheave blocks that constitute the second winch device, it has a sheave block and a pendant rope, and the additional sheave block is installed on the crane boom, and the pendant rope is attached to the end and upper part of the rope. It has a means of connection to the front frame,
The bottom expansion according to claim 1, wherein when the length of the lower front frame is changed for the bottom expansion bucket for excavation, the sheave block and rope in the second winch device and the pendant rope constitute one winch device. Pile hole excavator. 7. The drilling machine for expanding a bottom pile hole 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 is provided with a first holder for the rope connection means in the second winch device and a second holder for the connection device on the pendant rope, and the shaft portion excavation bucket is attached to the Kelly bar. Sometimes, the connection means at both ends of the rope that originally constitutes the second winch device are held in the first holder, and when the bucket for expanding bottom part excavation is attached to the Kelly bar, the pendant rope 7. The drilling machine for expanding a bottom pile hole according to claim 6, wherein the connecting means at both ends are held by a second holder. 9. Lower the second holder so that it can move between a position on the top sheave block that originally constitutes the second winch device and a position away from it. The expanded bottom pile according to claim 8, which is attached to the boom member and prevents the rope originally forming the second winch device from coming off the uppermost sheave block when in the former position. hole drilling machine.