JPH11256971A - Screw type excavating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working efficiency by connecting a screw and a rod to each other, and setting a total of the connection length to a depth of a target excavation hole or more. SOLUTION: A leader 4 is stood on the ground, and a screw head 10a provided at a tip of a screw 10 is positioned at an excavation position, and a motor 5 is driven so as to rotate the screw 10. The screw 10 goes ahead while discharging the earth, and when the whole length of the screw 10 is embedded in the ground, the screw 10 is drawn up once. Excavation at the second time is started, and the excavation is continued by the whole length of the screw 10. Each time when the whole length of the screw 10 is embedded in the ground, the screw is drawn up, and the similar excavation is repeated several times so as to form an excavation hole having a target depth. In this case, in the case where length of the screw 10 is short, quantity of the mud or the like to be pulled up at one time is small, and quantity of the mud to be fallen onto a bottom of the hole is small, and the hole having the accurate depth can be excavated. Efficient excavation can be performed in the case of using this device for a pile placing machine requiring accuracy of excavation hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw type excavator for forming a hole by excavating the ground.

[0002]

2. Description of the Related Art FIG. 10 is an overall view of a conventionally known pile driver. In this pile driver, the leader 4 attached to the tip of the boom 2 of the pile driver body 1 is erected on the ground by the boom 2 so as to be suspended, and the screw 15 attached to the leader 4 is rotated. Do excavation work. Then, the pile is driven into the excavation hole. 6 to 9 are diagrams for explaining an excavation operation and a pile driving operation by an excavating mechanism provided in the pile driver. The leader 4 is a support provided with a rail 4b, and is connected to the tip of the boom 2 via a rotatable support 3 shown in FIG. When the leader 4 needs to be lengthened to support the long screw 15, one long leader 4 is formed by adding a plurality of short leaders 4a. The support portion 3 is attached to the uppermost reader 4a, and a projection 4c is provided on the bottom surface of the lowermost reader 4a. The projection 4c sticks to the ground to prevent the erect leader 4 from rotating.

The above-mentioned reader 4 has a rail 4 formed on the reader 4 so that it can move up and down along the leader 4.
The motor 5 is mounted on the motor b. The motor 5 is suspended from above by a wire w via a pulley (not shown) provided on the support portion 3. This wire w
Can be wound up or loosened by a winch (not shown) for the motor 5 provided on the pile driver body 1 side. The motor 5 has a speed reducer, and a screw 15 for excavation is attached to an output shaft of the motor 5 via a joint 11a. This screw 1
5 has a length longer than the intended depth of the excavation hole, and a screw head 15a is provided at the tip thereof. The screw head 15a has a jagged portion in contact with the ground. The screw 15
When it is desired to increase the length, a plurality of short screws are connected to constitute one screw 15.
The screw 15 attached to the motor 5 is
It can be replaced with one with a diameter corresponding to the diameter of the target excavation hole.

Further, the leader 4 is provided with a monken 7 which is a hammer used for hitting a pile. The monken 7 is also mounted on the rail 4b opposite to the side on which the motor 5 is mounted so as to move up and down.
And 180 ° apart from the leader 4. The monken 7 is also suspended from above by a wire w via a pulley (not shown). The wire w can be wound up or loosened by a winch (not shown) for the Monken 7 provided on the pile driver body 1 side.

A hydraulic hose 6 is connected to the motor 5 so as to be driven by hydraulic pressure supplied from the pile driver body 1 side. In addition, a milk hose 20 is also connected to the motor 5, and the cement milk is supplied through the milk hose 20 when the milk is poured into the excavation hole. When the screw 15 is rotated with the screw head 15a attached to the ground, the screw head 15a scrapes the ground, and the screw 15 advances by the amount of the scraping. Thus, screw 15
Excavates while excavating. The screw 15 generates a propulsive force by rotating while the screw head 15a is in contact with the ground.
Is pressed against the ground by the weight of the motor 5 and the screw 15, so that there is no need for a force to continue pressing in the excavation direction. Note that a steady member 16 is fixed below the leader 4 so that the rotating shaft of the rotating screw 15 does not swing. This steady rest member 16 has a through hole larger than the diameter of the screw 15,
The screw 15 passes through this through hole. Therefore, the screw 15 cannot swing more than this through-hole diameter.

On the other side of the leader 4 (on the front side in FIG. 10), a suspender 8 for suspending a stake is suspended by a wire w. The wire w can also be wound up or loosened by a dedicated winch provided on the pile driver body 1 side. Such a pile driving machine digs a hole with the screw 15, inserts a pile lifted by the hanging tool 8 into the hole, and hits the pile with a monken 7 if necessary. Is performed. During the series of operations, when inserting the pile at the position of the excavation hole, the leader 4 is rotated together with the support portion 3 at the tip of the boom 2 so that the hanging tool 8 is aligned above the excavation hole. it can. Then, the pile is hooked on the hanging tool 8, and the pile adjusted to the position of the excavation hole is lowered by the winch to be inserted into the excavation hole. Even when the pile inserted into the excavation hole is hit with the monken 7, the leader 4 can be rotated to position the monken 7 above the pile. However, usually, only the stake is inserted into the excavation hole, and the stake is not hit with the monken 7. In particular, the monken 7 is used only when the tip of the pile is embedded to obtain a supporting force.

The process of digging a digging hole in the ground in such a pile driver will be described below with reference to FIGS.
However, in FIGS. 6 to 9, the hanging tool 8 for hanging the pile is used.
Is omitted. First, as shown in FIG. 6, the leader 4 is adjusted so that the screw 15 is aligned with the target excavation position.
And set the leader 4 on the ground with the bottom of the reader 4 attached. Next, until the screw head 15a touches the ground,
Lower the motor 5. From the state shown in FIG.
Is driven to rotate the screw 15, the screw 15 advances while discharging the soil (see FIG. 7).

[0008] By using such a screw 15, the screw 15 is advanced to a target depth. The total length of the screw 15 is equal to or greater than the target depth of the excavation hole. Here, as shown in FIG. 8, the state in which the entire length of the screw 15 has entered the ground is the state in which the screw 15 has been dug to the target depth. It is. At this time, mud is clogged between the blades of the screw 15 underground. Then, while rotating the motor 5, the screw 15 is pulled up together with the motor 5 by a winch (not shown). When the screw 15 is pulled up, the mud clogged between the blades is carried out to the ground, and an excavation hole 18 is formed as shown in FIG. When the screw 15 is pulled up, a person inserts a scoop or the like between the blades to drop mud attached between the blades of the ascending screw 15.

[0009]

When excavating to a target depth in the above-described excavation process, an operator operating the excavator rotates the screw 15 and at a stroke to the target depth with its propulsive force. I was digging. Therefore, when the length of the screw 15 corresponds to the depth of the excavation hole, as shown in FIG.
Until a reaches the target depth of the excavation hole 18, the screw 15 is pushed at a stroke.

When the screw 15 is propelled to a desired depth as described above, the screw 15 is pulled out from the excavation hole 18 while rotating the screw 15. At this time, mud attached to the screw 15 is removed from the excavation hole 18. Sometimes fell inside. Further, when the screw 15 is pulled out, the periphery of the excavation hole 18 may collapse and the collapsed soil may accumulate at the bottom of the excavation hole 18. in this way,
If the collapsed soil or mud, sand, or gravel attached to the screw 15 (hereinafter referred to as “mud or the like”) accumulates at the bottom of the excavation hole 18, the excavation hole 18 becomes shallower than a target depth. Further, if the amount of collapsed soil increases, in extreme cases, the hole diameter of the excavation hole 18 may even increase.

In particular, since the screw 15 having a length longer than the depth of the excavation hole 18 is fully propelled to the target depth, a large amount of mud or the like adheres to the screw 15 accordingly. It goes without saying that the more mud and the like adhered to the screw 15, the larger the amount of mud and the like falling into the excavation hole 18. In addition, since the screw 15 was propelled to a target depth at a stretch and was pulled out at a stretch, the stability around the excavation hole was impaired and the collapsed soil increased accordingly. That is, in this conventional excavator, when the screw 15 is pulled out while reaching the target depth, the excavation hole often becomes shallower than the target depth. When the borehole becomes shallower than the target depth, the screw 15
I even had to insert and re-dig.

When the excavator is used as a pile driving device, if the excavation hole is shallower than the target depth, the pile cannot be inserted to the target depth. Just because the pile cannot be inserted to the desired depth, the pile inserted into the excavation hole cannot be hit with Monken 7. This is because hitting a stake with Monken 7 will cause vibration and cause pollution, so special permission must be obtained. Therefore, when the pile cannot be inserted as intended, the pile inserted into the excavation hole 18 must be pulled out and the excavation work must be performed again. However, undoing the digging work is a difficult work such as undoing the setting of the leader 4, so that the working efficiency is extremely deteriorated. Further, it is troublesome that the depth cannot be known unless the stake is inserted into the excavation hole 18 in many cases.

Further, a steadying member 16 is provided so that the rotating shaft of the screw 15 does not swing. However, since it is difficult for the through hole of the steady member 16 to be caught by the screw 15 so that the screw 15 does not turn, the diameter of the screw 15 has some allowance. For this reason, the screw 15 may swing during the excavation by an amount corresponding to the clearance of the through hole of the steady rest member 16. If the screw 15 swings during excavation, the diameter of the excavation hole becomes large or the direction of the excavation hole is bent.

If the diameter of the excavation hole is too large, when the pile is inserted therein, the position of the pile fluctuates. In addition, if the direction of the excavation hole is bent, the insertion direction of the pile is also incorrect. If the stake is inserted incorrectly, it will not be usable as a stake, and it will be a complete strike.

[0015] Furthermore, when the lifting operation is performed while rotating the screw 15, using a scoop or the like,
It tries to drop mud and the like between the blades, but not all mud and the like can be removed. Therefore, screw 15
The mud and the like remaining in the crater may be scattered around by the rotation of the screw 15. In particular, when the screw 15 is long, the mud or the like is lifted to a higher place, so that the mud is scattered far. At the construction site where the pile is driven, the surrounding area is surrounded by a fence or the like, but the fence and the excavation site are often close to each other from the viewpoint of effective use of land. And the fence of this construction site is no more than 3m
Before and after. However, the length of the screw 15 in pile driving may be 20 m or more. In such a case, the missed mud and the like may fly over the fence and damage even a third party outside.

Also, FIG. 6 → FIG. 7 → FIG.
As 5 digs underground, the motor 5 that rotates this screw 15 also descends with the screw 15.
When the motor 5 is lowered, the hydraulic hose 6 and the milk hose 20 connected to the motor 5 are loosened and lowered. For example, as shown in FIG. 7, when the loosened hydraulic hose 6 and milk hose 20 come down, there is a risk that these hoses 6, 20 may be wound around the screw 15 rotating on the ground. These hoses 6, 20
Is wound around the screw 15, not only must the motor 5 be stopped and unraveled, but also the hydraulic hose 6 breaks and the motor 5 cannot be driven.

Further, during excavation as shown in FIG. 7, when the residual soil 19 accumulated around the screw 15 is to be treated with a power shovel, the tip of the shovel may be caught on the screw 15. When the shovel is caught on the screw 15, the rotation of the screw 15 is stopped, and excavation work cannot be performed. Also, stop the power shovel on the slope and screw 15
If the shovel is caught on the screw 15 while the soil is being removed while the shovel is being pulled out, the shovel is pulled up, so that the power shovel may fall down along the slope.

Further, the screw 15 is formed by connecting a plurality of short screws to a desired length in order to dig a deep hole. However, this connection wears when the screw 15 becomes old. Therefore, a connection gap may be formed between the connection portions. However, when removing the mud or the like from the screw 15 using the scoop, the tip of the scoop may be caught in the connecting gap. If a scoop is caught between the connecting gaps, the scoop is taken in the moving direction of the screw 15, which is very dangerous and may lead to a major accident.

Further, in the above-mentioned conventional excavator, since the screw 15 having a length equal to or more than the depth of the target excavation hole must be used, the total length of the screw 15 is inevitably increased. However, since the screws are bulky and very heavy, there is a problem that the longer the screws are, the more difficult it takes to transport and install the screws, and it takes much time. Furthermore, since a heavy and long screw is attached to the tip of the boom 2 of the pile driver body 1, the pile driver body 1
There was also a problem that the side became unstable. If the pile driver body 1 becomes unstable, the boom cannot be extended far away, so that the working range is reduced accordingly. An object of the present invention is to provide an excavator that solves all the problems of the conventional excavator.

[0020]

SUMMARY OF THE INVENTION The present invention is based on a screw type excavator which excavates using the propulsive force of a screw. The first invention is characterized in that the screw and the rod are connected while assuming the above-described excavator, and the sum of the connection lengths is set to be equal to or greater than the depth of the target excavation hole. Having. According to a second aspect of the present invention, there is provided a rail-shaped leader attached to the tip of a boom provided on a main body, a motor movably mounted along the leader and driven by hydraulic pressure supplied from the main body, and an output shaft of the motor. And a screw connected to the rod and connected to the rod to excavate the ground by a propulsive force of rotation, and a leader is provided with a steady rest member provided with a bearing for penetrating the rod. The feature is that it can be moved up and down along the leader that has been set. The third invention is characterized in that a plurality of rods can be connected.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment shown in FIGS.
It is a screw type excavator used for the conventional pile driver shown in FIG. This excavator has a motor 5 in which a hydraulic hose 6 is connected to a rail 4b of a leader 4 as in the conventional example.
Is installed. The hydraulic hose 6 is connected to a hydraulic pump provided on the pile driver body 1 (not shown), and supplies the hydraulic pressure of the hydraulic pump to the motor 5. A rod 9 made of a round bar is connected to the motor 5 by a joint 11a via a speed reducer, and a screw 10 is connected to the rod 9 via a joint 11b. The motor 5 and the rod 9, and the rod 9 and the screw 10 are detachable by joints 11a and 11b, respectively. A screw head 10 similar to the conventional screw head 15a is provided at the tip of the screw 10.
a is provided.

Then, the rod 9 and the screw 1
The sum with the length of 0 is equal to or greater than the desired depth of the excavation hole 18. However, in this embodiment, the length of the rod 9 is set to several times the length of the short screw 10, and the entire length corresponds to a desired depth. However, the rod 9 can be connected in any number according to the depth of the target excavation hole 18. Also, the screw 10 may be configured to be able to connect it. However, when the screw 10 is configured to be connected, as described in the example of the conventional excavator, a connection gap is formed between the connection portions, and a scoop or the like may be trapped therein. Therefore, it is advantageous to use a single screw without connecting the screws.

Further, a first steady rest member 13 and a second steady rest member 14 are attached to the leader 4. Second
The steady rest member 14 is the same as the steady rest member 16 of the conventional example, and is fixed to the leader 4. However, the first steady member 13 is attached to the rail 4b of the leader 4 so that it can move up and down along the leader 4. The first anti-sway member 13 includes a bearing, through which the rod 9 penetrates, so as to reliably prevent the rod 9 from oscillating. The first anti-sway member 13 thus configured is lowered by its own weight along the rail 4b. On the other hand, a stopper 12 is provided on the rod 9, and the first steady member 13, which has been lowered by its own weight, is
It stops at this stopper 12 position. The other components such as the hydraulic power source of the motor 5 and the winch for lifting the motor 5 are the same as those of the conventional example, and therefore, the description thereof is omitted, and the same members are denoted by the same reference numerals.

The operation of the excavator will be described below. However, the following description is based on the assumption that the screw is not a short screw but a single screw. As shown in FIG. 1, a screw head 1 provided at a tip of a screw 10 with a leader 4 standing on the ground.
0a is adjusted to the excavation position as shown in FIG. When the motor 5 is driven to rotate the screw 10 from the state of FIG. 1, the screw 10 advances while discharging earth and excavates the ground by the propulsive force of the rotation. And FIG.
When the entire length of the screw 10 is buried in the ground as shown in
You will not be able to excavate. In other words, the screw 10 discharges mud and the like scraped by the screw head 10a and propulses only by an amount corresponding to the discharging capacity.

When the screw 10 loses the propulsive force, the screw 10 is lifted while continuing to rotate, and is once pulled out. At this time, using a scoop or the like, the mud or the like attached to the screw 10 is dropped. However, since the single screw 10 is used as described above, the scoop is taken off at the connecting portion of the screw as in the related art. There is no such thing.

The depth of the excavation hole 17 is determined by the screw 10
Equal to the length of In this embodiment, since the length of the screw 10 is reduced to a fraction of the length of the target drilling hole 18, the depth of the drilling hole 17 formed in the first round is equal to the target drilling hole. At a depth of 18, there is not enough. Next, a screw head 10a
And start the second drilling from there. Then, the excavation is continued for almost the entire length of the screw 10 again. As shown in FIG. 4, the screw 10 excavates further by the length of the screw 10, that is, by the same depth as the excavation hole 17. Then, if the screw 10 is completely submerged in the ground, it will not be possible to excavate again at that time, so that excavation will not be possible. When the propulsion of the screw is stopped in this way, when the screw 10 is rotated and pulled up again to remove the soil, a drilled hole having a depth twice as deep as the drilled hole 17 in FIG. 3 is formed. Thereafter, excavation is repeated several times in the same manner as described above, and as shown in FIG.
8 is formed.

If the excavation hole 17 formed in the first excavation
Even if mud or the like accumulates at the bottom of the ground, the mud or the like can be removed by the second excavation operation. In this way, even if mud or the like falls or collapses during excavation on the way, it can be eliminated in the subsequent excavation process. Therefore, if the excavation operation is repeated many times with a short screw, the amount of mud or the like accumulated at the bottom of the excavation hole can be reduced accordingly. In particular, if the length of the screw is short, the amount of mud, etc. pulled up at one time will be small,
The amount of mud and the like falling to the bottom of the hole is also reduced, and the hole with the correct depth can be excavated. Also, excavating many times with short screws stabilizes the area around the hole and reduces the amount of collapsed soil.

As described above, in this embodiment, several excavation operations must be repeated. In that sense,
It also seems to increase working time. However, in the entire staking operation, the operation time can be shortened in many cases. For example, as described above, even a conventional excavator may not be able to complete a single excavation operation. Especially when the pile is inserted into the drilling hole and it is found that the depth is not enough due to the collapse, it is necessary to reset the leader 4 and the screw, so the total time of work is It is no longer the ratio of this embodiment.

However, in the above-mentioned conventional case, it is also possible to excavate the screw 15 several times without moving the screw 15 fully. However, if a long screw 15 having a length equal to or greater than the depth of the digging hole is used, the operator will continue digging as long as the thrust of the screw 15 is exerted. As a result, the excavation is performed with the screw 15 as much as possible, and mud and the like are dropped on the bottom of the excavation hole.

However, if the screw 10 is shorter than the intended depth of the excavation hole as in this embodiment, the thrust of the screw is necessarily lost on the way, so that regardless of the operator's will, You cannot dig to the depth at once. After all, in order to dig to the desired depth, the digging operation has to be repeated several times. And
The greatest feature of this embodiment is that the excavation operation must be repeated several times regardless of the operator's intention. That is, the configuration means that the rod 9 and the screw 10 are connected and the screw 10
The length of the screw 10 is made shorter than the intended depth of the excavation hole, so that the propulsive force of the screw 10 is eliminated during excavation.

Further, since the deflection of the rod 9 can be reliably prevented by the first anti-sway member 13 provided on the rod 9, the deflection of the rotating shaft of the screw 10 can be reduced. for that reason,
The screw 10 swings during excavation, and the diameter of the excavation hole does not increase or its direction does not change. Since the first steady rest member 13 is lowered by its own weight, even if the rod 9 moves up and down, it moves up and down together with the stopper 12 and supports the rod 9 at a position close to the joint 11b with the screw 10. I am trying to do it. Therefore, compared to a case where the first steady rest member 13 is provided at a position far from the screw 10 above the rod 9, the swing of the screw 10 can be more efficiently prevented. Therefore, excavation accuracy can be further improved.
As described above, if the excavator capable of excavating with high accuracy is applied to a pile driver, the efficiency of the pile driving operation is improved.

Further, as described above, when the screw 10 is pulled up while rotating, the mud or the like is scraped off with a scoop or the like. At this time, since the mud and the like cannot be completely removed, the remaining mud and the like are lifted together with the screw 10. However, screw 10
Since the body itself is relatively short, mud or the like is not lifted by tens of meters as in the related art. Therefore, the mud or the like attached to the screw 10 does not scatter far beyond the fence surrounding the construction site, and naturally does not damage a third party outside the fence.

Further, during excavation, as shown in FIG. 2, the motor 5 descends, and the hydraulic hose 6 and the milk hose 20 come loose and descend. However, at the time of the first excavation, the excavation depth is not so deep, so that the hydraulic hose 6 and the milk hose 20 are less loose. In addition, since the length of the screw protruding from the ground is short, the hydraulic hose 6 hardly wraps around the screw 10 during the first excavation. In addition, during the second and subsequent excavations,
Since the screw 10 goes underground and only the rod 9 is exposed on the ground, no matter how loose the hydraulic hose 6 or the milk hose 20 is, it does not wind around the screw 10.

Further, the remaining soil 19 accumulated around the excavation hole
Is to be processed by a power shovel,
As described in the above, if the screw 10 has entered the ground, the tip of the shovel will not be caught on the screw 10. In other words, during the second and subsequent excavations,
Even if the screw 10 rotates, the remaining soil 19 can be safely treated. Also, when forming a drilled hole of the same depth, the length of the screw portion can be made shorter than before by the amount of the rod 9, so that the whole becomes lighter and the transport becomes easier.
On the other hand, if the required hole diameter changes depending on the type of pile,
The screw diameter must be selected according to the hole diameter, but the replacement work at that time is also easier. Since the weight can be reduced in this way, the stability of the pile driver body side can be maintained even when it is attached to the pile driver body. Further, since the stability of the pile driver body side is increased, the boom can be extended to a distant place, so that the workable range is widened accordingly.

In this embodiment, the rod is composed of one rod 9, but when the depth of the drilling hole is deep, a plurality of short rods are connected by the same joint as the joint 11b. Thus, the total length combined with the screw 10 can be equal to or greater than the depth of the excavation hole. In this way, even when the drilling hole is deepened, it is possible to cope with the depth of the drilling hole without lengthening the screw. Also,
Even when digging deep holes, there is no need to connect several screws. This means that when the mud or the like attached to the screw is dropped with a scoop as in the conventional case, there is no accident that the tip of the scoop is caught in the connecting gap. However, if the target excavation hole is very deep, connecting a plurality of short screws to form one long screw has the advantage that the number of excavations does not need to be too large.

[0035]

According to the first aspect of the present invention, the length of the screw is made shorter than the depth of the target drilling hole, so that the drilling must be repeated when forming the target drilling hole. Therefore, high-precision excavation is inevitably performed.
Accordingly, efficient excavation can be performed even when the excavation hole requires accuracy, for example, when used in a pile driver. Further, the mud or the like attached to the screw is less likely to be scattered farther as the fence surrounding the excavation site is exceeded, as in the related art. Furthermore, even if the hydraulic hose or milk hose comes loose during excavation, there is less danger of getting them caught in the screw. Since the time during which the screw is in the ground during excavation is longer than before, the remaining soil around the excavation hole can be safely treated during that time, and the work efficiency can be improved. In addition, since the heavy screws are short, they can be easily transported and replaced, and when these screws are connected to the end of the boom of the main body, the whole body can be made lighter to maintain a stable body. In addition, safety is dramatically improved. Further, since the end of the boom can be moved away from the main body, the workable range is widened. If the screws are not connected, there is no possibility that the tip of the scoop is caught in the screw connection gap during the mud dropping operation, resulting in an accident.

According to the second aspect of the present invention, the accuracy of the excavated hole can be further improved by preventing the rod from oscillating and suppressing the screw from oscillating. According to the third aspect of the present invention, even when the target drilling hole is particularly deep, the rod is lengthened and the length of the screw is not increased. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a digging operation of this embodiment, and shows a starting state.

FIG. 2 is a view for explaining the excavation work of this embodiment, and shows a state in which the screw has been dug during the first excavation work.

FIG. 3 is a view for explaining the excavation work of this embodiment, and shows a state where the earth is discharged in a first excavation work.

FIG. 4 is a view for explaining the excavation work of this embodiment, and shows a state in which the screw has been dug during the second excavation work.

FIG. 5 is a view for explaining the excavation work of this embodiment, and shows a state where the earth is discharged in the last excavation work.

FIG. 6 is a view for explaining a conventional excavation operation, and shows a starting state.

FIG. 7 is a view for explaining a conventional excavation operation, and shows a state during excavation.

FIG. 8 is a view for explaining a conventional excavation work, and shows a state in which a screw has been dug.

FIG. 9 is a view for explaining a conventional excavation work, and shows a state where earth is discharged.

FIG. 10 is an overall view of a conventional pile driver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile driver main body 2 Boom 4 Leader 4b Rail 5 Motor 6 Hydraulic hose 9 Rod 10 Screw 13 First steady rest member 18 Drilling hole

Claims (3)

[Claims] In a screw type excavator for excavating using a propulsive force of a screw, a screw and a rod are connected to each other, and the total of the connecting lengths is set to a length equal to or greater than the depth of a target excavation hole. Screw excavator. 2. A rail-shaped leader attached to the tip of a boom provided on a main body, a motor movably mounted along the leader and driven by hydraulic pressure supplied from the main body, and an output shaft of the motor. An associated rod and a screw connected to the rod and excavating the ground by a propulsive force of rotation are provided, and a leader is provided with a steady rest member provided with a bearing for penetrating the rod, and the steady rest member is erected. The screw-type excavator according to claim 1, wherein the screw-type excavator is movable up and down along the leader. 3. The system according to claim 1, wherein a plurality of rods are connectable.
Or the screw type excavator according to 2.