JP3085942B2 - Drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an excavator having an auger screw for excavating the ground.

[0002]

2. Description of the Related Art An earth auger is generally known as a device for excavating the ground to form a vertical hole. In the earth auger, for example, an auger screw having a round bar-shaped shaft and a spiral screw provided from the lower end to the upper portion of the shaft is used. Further, as shown in FIG. 4, a casing auger in which an auger screw 1 is disposed in a cylindrical casing 2 is also known.

[0003]

In auger screws and casing augers, for example, the tip (auger head) having, for example, a digging blade is worn in a relatively short period of time. The auger head can be replaced only when the auger head is worn. However, in the auger screw, the lower part above the auger head is more likely to wear than the upper part of the auger screw, and even if the upper screw of the auger screw can still be used, the lower screw of the auger screw wears first. I had to replace the entire auger screw. In particular, in the casing auger, when excavating the ground containing a lot of stones such as gravel, the lower part of the auger screw is in a state where the gravel is sandwiched between the casing and the screw to break the gravel, and the auger screw is removed. The lower screw is easily worn. In addition, in the casing auger, when exchanging the auger screw, the entire auger screw must be pulled out from the casing, and it takes time to exchange the auger screw.In particular, the longer the casing or the auger screw becomes, the more the auger screw needs to be exchanged. The work was hard.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide an excavator that can be efficiently and easily replaced when an auger screw is worn.

According to a first aspect of the present invention, there is provided an excavator having an auger screw for excavating a ground,
The auger screw includes an auger tip serving as a tip of the auger screw, an auger lower portion above the auger tip, and an auger upper portion above the auger lower portion,
Since the auger tip, the auger lower part, and the auger upper part are detachably joined, the auger screw can be divided into at least three of the auger tip part, the auger lower part, and the auger upper part. To
Is provided with a joint shaft that extends downward, and
Is formed with a through hole through which the joint shaft passes, and
The insertion hole into which the tip of the joint shaft is inserted
Is formed and the lower part of the auger penetrates the lower part of the auger.
The lower end of the joint shaft at the top of the mower fits into the insertion hole at the tip of the auger.
Inserted, and the lower end of the joining shaft and the auger tip
The parts are detachably joined to each other. Up
According to the configuration, the auger screw has an auger tip and
It can be divided into an auger lower part and an auger upper part
Other auger, leaving the upper part of the auger relatively hard to wear.
Only the lower part and the tip of the auger can be exchanged. You
In other words, only the tip of the auger that is worn first
Can be replaced in the same way as
The lower part of the auger can be replaced by removing it from the upper part of the auger.
To replace both the auger bottom and the auger tip
Only the lower part of the auger or the tip of the auger.
It can also be exchanged. Therefore, the entire auger screw
Replacement work can be saved rather than replacement.
Running cost because the upper part can be used for a long time
And waste can be reduced. In addition,
The lower part of the auger is divided into
The clew may be divided into four or more. Ma
The through hole at the bottom of the auger passes through the joint axis at the top of the auger.
With the auger tip joined to the tip of the joining shaft.
If so, the upper part of the auger will not come off the joint axis,
The axle at the top of the auger was made to pass through the through hole at the bottom of the auger
Just join the auger bottom and auger top
Can be Therefore, it is easy to place
The part and the tip can be joined.

According to a second aspect of the present invention, there is provided the excavator according to the first aspect.
In the drilling rig described, the auger screw is circular.
Characterized in that it is arranged in a cylindrical casing.
You. According to the above configuration, the lower part of the auger screw body
(Slightly above the screw head)
Since there is no need to replace the entire auger screw,
No need to pull out the entire auger screw from the shing
The lower part of the auger and the tip of the auger under the casing.
To replace the auger screw.
It can be easy. In particular, August Cru
If the device has a structure as described in claim 1,
Remove the lower end of the auger from the joint shaft by removing the
And the auger lower part as the joint axis.
After extrapolation, attach the auger tip to the tip of the joint shaft
Then, the lower part of the auger can be attached to the upper part of the auger,
Attach the lower part of the auger to the upper part of the auger, remove
Remove the lower auger from the shaft or
Lower the auger into the casing so that it can be inserted into the through hole
Just insert the lower part of the auger and the auger in the casing.
It is not necessary to perform mounting work at the joint with the upper part.
No. Therefore, even the tip of the auger screw
Out of the casing,
Side, the auger tip can be removed and mounted.
The auger bottom is easily removed and removed as described above.
Can be attached, and the inside of the casing can be extremely easily
The lower part of the gas can be replaced.

[0007]

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An excavator according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a casing auger used in this example of an excavator, and FIGS. 2 and 3 show auger screws of the casing auger. As shown in FIG.
The casing auger of the excavator of this example includes a casing 10 and an auger screw 11. The auger screw 11 excavates the ground by rotating around the axis about the axis. The rotation of the auger screw 11 is performed by a rotary drive unit such as a hydraulic motor or a transmission motor. Also,
The casing 10 is a well-known vertically long cylindrical shape. And the casing auger of this example is, for example,
It is used for a well-known pile press-in device that can take a reaction force from an existing pile and pressurize a new pile by hydraulic pressure, and that can run on the existing pile by itself. By slightly excavating the ground with a casing auger, it is used to enable the press-fitting of piles even on hard ground, especially ground containing a large amount of gravel and the like. The casing auger can be used not only for press-fitting a pile but also for various excavators for excavating the ground, and can also be used with the auger screw 11 alone. Then, the casing auger and the auger screw 1
1 is used, for example, for excavation of foundations and other ground excavations, such as a digging method, a cast-in-place method, a pre-boring method, and an underground continuous wall method, and can also be used for a known earth auger.

In the casing auger of this example of the excavator, the auger screw 11 has the following configuration. That is, the auger screw 11
Has an auger upper part 20, an auger lower part 30, and an auger tip part 40 (auger head). The auger upper part 20 constitutes an upper part except a lower part of the auger screw 11, and has a connecting part 21 for connecting the auger screw 11 to the rotation driving means, and the connecting part 21 integrated with the connecting part 21. Shaft 22 extending downward from
And a joining shaft 23 extending downward from the shaft portion 22 in a state integrated with the shaft portion 22, and a state in which the periphery of the shaft portion 22 is inclined vertically from the upper part to the lower part with respect to the circumferential direction. And a spiral screw 24 extending therefrom. The connection part 21 is a well-known one that connects the auger screw 11 to a rotation driving unit. The shaft portion 22 serves as an upper portion of the shaft of the auger screw 11. The joint shaft 23
Is for connecting the auger lower part 30 and the auger tip part 40 to the lower side of the auger upper part 20, and has a substantially hexagonal (regular hexagonal) prism shape in cross section. The joint shaft 23 has a smaller diameter than the shaft portion 22 so that the joint shaft 23 does not go outside from the outer periphery of the shaft portion 22 when viewed in plan. In addition, a groove or a hole (not shown) for engaging a fixing pin (not shown) for fixing the auger lower part 30 and the auger tip part 40 is formed in the joining shaft 23 as described later. The screw 24 is a well-known screw and may be a single screw or a plurality of screws.

The auger lower part 30 constitutes a lower part excluding an upper part and a tip part of the auger screw 11, and has a shaft part 31 and a screw 32. The shaft portion 31 has substantially the same diameter as the shaft portion 22 of the auger upper portion 20 and has a through hole 33 into which the joint shaft 23 of the auger upper portion 20 is fitted. The through hole 33
In the upper part and the lower part, fitting portions 33a and 33b that fit with the joining shaft 23 are formed. The fitting part 33
a and 33b have a hexagonal cross section substantially similar to that of the joint shaft 23. When the joint shaft 23 is made to pass through the through hole 33, the fitting portions 33a and 33b of the through hole 33 are formed.
Are fitted to the joint shaft 23, and the auger lower part 30 cannot rotate with respect to the auger upper part 20, ie, the auger upper part
0 and the auger lower part 30 rotate integrally. A fixing pin (not shown) is provided at the lower end of the shaft portion 31.
Is formed, and the pin hole 3 is formed.
By inserting a fixing pin into the joining shaft 23 from 4, the auger lower part 30 can be fixed to the joining shaft 23. The screw 32 is the same as the screw 24 except that the length is different. In a state where the auger lower part 30 is fitted to the joining shaft 23 at a predetermined angle, the screw 32 and the screw 24 are substantially continuous. Becomes

The auger tip portion 40 constitutes the tip portion of the auger screw 11, and has a shaft portion 41, a screw 42, and an excavating blade 43 for excavating the ground. The shaft portion 41 has substantially the same diameter as the shaft portion 22 of the auger upper portion 20 and the shaft portion 31 of the auger lower portion 30, and has an insertion end into which the distal end portion of the joining shaft 23 of the auger upper portion 20 is inserted and fitted. It has a hole 44. The insertion hole 44 has a substantially hexagonal cross section similar to that of the joining shaft 23. When the joining shaft 23 is inserted into the insertion hole 44, the auger tip 40 cannot rotate with respect to the joining shaft 23. . Further, a pin hole 45 is formed in the shaft portion 41 to allow a fixing pin (not shown) to pass therethrough.
The auger tip 40 can be fixed to 3. Screw 4
2 is the same as the screw 24 and the screw 32 except that the length is different.
0 at a predetermined angle, and the auger tip 40 is fitted at a predetermined angle to the tip of the joining shaft 23,
The screw 42 and the screw 32 are substantially continuous.

Next, a method of replacing the auger lower part 30 and the auger tip part 40 will be described. First, in the auger screw 11 of the casing auger, the shaft portion 31 of the auger lower portion 30 is attached to the joint shaft 23 of the upper portion 20 of the auger.
The joint shaft 23 and the shaft portion 31 of the auger lower part 30 are fixed by the fixing pin. Further, the shaft 41 of the auger tip 40 is joined to the tip of the joint shaft 23 at the upper part of the auger in a state where the tip of the joint shaft 23 is inserted into the insertion hole 44 of the shaft 41. The joint shaft 23 and the shaft portion 41 of the auger tip portion 40 are fixed by a fixing pin. In this state, the shaft 22, the shaft 31, and the shaft 41 are connected to form one shaft of the auger screw 11, and the screw 24, the screw 32, and the screw 42 are separated from the upper portion around the shaft of the auger screw 11. The auger 20, the auger lower 30, and the auger tip 40 function as a single auger screw 11.

The screw 32 of the auger lower part 30
And the screw 42 and the excavating blade 43 of the auger tip 40
When the auger screw 11 is worn, first, with the auger screw 11 disposed in the casing 10, the fixing pin that fixes the auger tip portion 40 to the joining shaft 23 of the auger upper portion 20 is removed. At this time, since the auger tip portion 40 is out of the casing 10, the fixing pin can be easily removed. Next, the auger tip 40 is removed by extracting the auger tip 40 from the joint shaft 23 of the auger upper part 20. Next, at the lower end of the auger lower part 30, the fixing pin fixing the auger lower part 30 to the joint shaft 23 is removed. At this time, the lower end of the auger lower part 30 is outside the casing 10 or the casing 10
Because it is just inside the opening at the lower end of the auger screw 11 without slightly pushing the auger screw 11 downward from the casing 10,
The fixing pin can be easily removed. In addition, even if the auger screw 11 is extruded to the lower side of the casing 10, the fixing pin can be easily removed by slightly extruding the auger screw 11 to the lower side. It's easier than taking out the whole. Next, the auger lower part 30 is removed by extracting the auger lower part 30 from the joint shaft 23 of the auger upper part 20. Since the auger lower part 30 is fitted so as not to rotate with respect to the joining shaft 23 as described above, the auger lower part 30 is not necessarily directly connected to the joining shaft 23.
It is not necessary to fix the auger lower portion 30 to the joint shaft 23 in a state where the auger lower portion 30 is fitted to the joint shaft 23.
By fixing the auger lower part 30 from the joint shaft 23.
May be fixed so as not to come off. In this case, the auger lower part 30 can be removed only by removing the auger lower part 30 from the bonding shaft 23 after removing the auger tip part 40 from the bonding shaft 23.

Next, the new auger lower part 30 is pushed into the casing 10 while the joining shaft 23 is inserted into the through hole 33 of the shaft part 31 of the auger lower part 30, and then the shaft part 31 of the auger lower part 30 is inserted. The auger lower part 30 is attached to the auger upper part 20 by inserting a fixing pin into the pin hole 34 of the auger. Next, the new auger tip 40 is inserted into the insertion hole 44 of the shaft 41 of the auger tip 40 so that the tip of the joining shaft 23 is inserted into the auger tip 40 of the auger upper part 20. Combine. Next, the auger tip 40 is attached to the auger upper part 20 by inserting a fixing pin from the pin hole 45 of the auger tip 40.
Also in these mounting operations, as in the case of the removing operation, the operation can be performed outside the casing 10 or just inside the lower end opening of the casing 10, so that the auger tip portion 40 and the auger lower portion can be extremely easily attached to the auger upper portion 20. 30 can be attached.

Further, not only the auger tip portion 40 of the auger screw 11 but also the auger lower portion 30 which is the lower portion of the auger screw 11 excluding the auger tip portion 40 can be replaced. When the auger lower part 30 is worn out and cannot be used, the auger screw 11
It is not necessary to replace the entire part except for the auger tip part 40, and only the auger lower part 30 needs to be replaced. 20 can be used for a long time. Therefore, it is possible to reduce the running cost of the auger screw 11 and the waste. Further, in the casing auger, even if the auger lower portion 30 of the auger screw 11 is worn, it is not necessary to extract the entire auger screw 11 from the casing 10, and the auger lower portion 30 and the auger tip 40 may be extracted from the casing 10. So auger screw 1
1 can save labor for replacement work due to wear. In particular, if the auger screw 11 is configured as described above, basically, the auger lower part 30 and the auger tip part 40
Can be easily performed outside the casing 10 and the auger lower 30 and the auger tip 40 can be removed from the auger upper 20 without moving the auger upper 20. Can be extremely labor-saving. The auger upper part 20 is worn in a state where the auger upper part 20 is disposed in the casing 10 (as shown in FIG. 1).
The screw 24 of the upper part 20 is arranged in the casing 10.
Since they are location), it is a difficult to confirm from outside, if it only auger bottom 30 easily Nukitoreru configured as described above, to easily check the wear state of the auger bottom 30 The wear state of the auger upper part 20 can be estimated from the wear state of the auger lower part 30. Therefore, the wear state of the entire auger screw 11 including the auger upper part 20 can be known without removing the entire auger screw 11 from the casing 10, and maintenance of the auger screw 11 can be facilitated.

In the above example, the joining shaft 23 is formed into a prismatic shape (if it is polygonal, it may not be hexagonal), and the auger lower portion 30 and the auger tip portion 40 have the prismatic joining shaft 2.
Although the through hole 33 and the insertion hole 44 having substantially the same cross-sectional shape as those of No. 3 are provided, the joining shaft 23 and the auger lower part 30 and the auger tip part 40 may be spline-fitted. Further, the joining shaft 23 may be a male screw, and the auger lower portion 30 and the auger tip portion 40 may be provided with a female screw hole to be screwed with the joining shaft 23. In this case, the joining shaft 2
It is necessary to provide a mechanism for preventing the auger lower part 30 and the auger tip part 40 from rotating with respect to 3. In the above example, the auger lower part 30 and the auger tip part 40 are both attached to the joint shaft 23 of the auger upper part 20.
An auger lower part 30 may be attached to the auger upper part 20, and an auger tip part 40 may be attached to the auger lower part 30. However, in this case, since the mounting and removing operations of the auger upper part 20 and the auger lower part 30 are performed inside the casing 10, the configuration as in the above example is preferable.

[0017]

According to the excavator of the present invention, only the tip of the auger which is worn first can be replaced in the same manner as before, and the lower auger which is easily worn next is removed from the upper part of the auger. Can be replaced
It is possible to reduce the running cost and the waste of the auger screw. Further, the auger lower part and the auger upper part can be easily joined by attaching the auger tip part to the tip part of the auger lower part in a state where the joining shaft of the auger upper part is made to pass through the through hole at the lower part of the auger. According to the excavator of the second aspect of the present invention, in the casing auger, even if the lower portion of the auger screw body is worn, it is not necessary to pull out and replace the entire auger screw from the casing. It can be easy. Also, by extracting the lower part of the auger in the casing and checking the state of wear of the lower part of the auger, the state of wear of the upper part of the auger can be inferred. Can be known without pulling out the auger screw, and maintenance of the auger screw can be facilitated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a casing auger of an excavator according to an embodiment of the present invention.

FIG. 2 is a developed side view showing an auger screw of the excavator of the above example.

FIG. 3 is a developed perspective view showing an auger screw of the excavator of the above example.

FIG. 4 is a sectional view showing a conventional casing auger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Casing 11 Auger screw 20 Auger upper part 23 Joining axis 30 Auger lower part 33 Through hole 40 Auger tip part 44 Insertion opening

Claims (2)

(57) [Claims] 1. An excavating apparatus provided with an auger screw for excavating a ground, wherein the auger screw includes:
An auger tip serving as a tip of the auger screw, an auger lower part above the auger tip, and an auger upper part above the auger lower part, and these auger tip, auger lower part, and auger upper part are detachable. By being joined to the auger screw, the auger screw can be divided into at least three of the auger tip portion, the auger lower portion and the auger upper portion, and a joining shaft extending downward is provided at the auger upper portion, At the lower part of the auger, a through-hole through which the joining shaft passes is formed. At the tip of the auger, an insertion hole into which the tip of the joining shaft is inserted is formed. The lower end of the upper joining shaft is inserted into the insertion hole of the auger tip, and the lower end of the joining shaft and the auger tip are detachably joined. Drilling rig to be. 2. An excavator according to claim 1, wherein said auger screw is disposed in a cylindrical casing.