JPH0141767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an excavator having a plurality of auger shafts and drilling a plurality of consecutive holes in foundation work and the like. The purpose of this is to significantly improve the vertical holding performance of the auger shaft when drilling multiple consecutive holes, making it possible to drill holes in accurate positions and continuously excavate.
It also makes it easier to change the direction when excavating a corner part, reduces the earth pressure when pulling the shaft out of the hole after excavation, and makes it easier to pull out.In addition, it reduces the cost of manufacturing the excavator, etc. The aim is to reduce

Conventionally, drilling machines in which a plurality of auger shafts are provided for drilling a plurality of consecutive holes, for example,
As shown in the figure, three auger shafts a for drilling three consecutive holes were each suspended directly from a drive device b, and each auger shaft a was very long. Therefore, when drilling a hole in the ground c using such an excavator, the direction of the auger shaft a shifts due to changes in the ground as the excavation continues, making it impossible to drill at an accurate location. Further, when drilling holes continuously, there is a problem in that the auger axis a shifts in the direction of the previously drilled hole, making it impossible to perform continuous drilling. In addition, when excavating a corner part with such an excavator, in order to change the direction of the aligned auger shafts a, it is necessary to rotate the leader itself to move them up and down, and it is necessary to excavate the corner part. was extremely difficult. Furthermore, in the case of such an excavator, since multiple long auger shafts a are used, material costs are high, manufacturing and maintenance costs are high, and the weight is large, making it inconvenient to handle, and the center of gravity of the entire excavator is The drawbacks were that it was expensive and had poor stability.

This invention was made in view of the above-mentioned circumstances, and instead of hanging a plurality of auger shafts directly from the drive device, a casing pipe that can be rotated and fixed freely is hung from the drive device, and a casing pipe that can be freely rotated and fixed is suspended inside the casing pipe. The main shaft for rotating each auger shaft is inserted through the box, and the rotation of the main shaft is transmitted to each auger shaft by a rotation transmission mechanism provided in the rotation transmission box. Problems and disadvantages of conventional excavators In order to eliminate such problems, the stirring shaft is extended upward from the rotation transmission box, and this stirring shaft is also linked to the rotation main shaft by a rotation transmission mechanism.
This is designed to increase the stirring effect and reduce the earth pressure when pulling up the auger shaft.

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 2 to 4.

In the figure, 1 is a crawler crane, and the excavator A shown in this embodiment is suspended from a vertically held leader 2 of the crawler crane 1, and is attached to the front side of the leader 2, as shown in FIG. It is equipped to move up and down along a provided guide rail 3. However, the means for equipping the excavator A is not limited to this, and it is of course possible to use a truck crane or the like instead of the crawler crane 1.

Reference numeral 10 indicates a drive device of excavator A, and reference numeral 11 indicates a casing pipe suspended from this drive device 10. This casing pipe 11 is rotated and rotated with respect to the drive device 10 by a rotating device 12 equipped with a hydraulic motor and a lock mechanism. It is provided so that it can be fixed. The reason why the casing pipe 11 is rotatably and fixedly provided with respect to the drive device 10 is to fix the casing pipe 11 when excavating in the vertical direction.
This is to increase the holding force in the vertical direction, and to rotate the casing pipe 11 to change the direction in which the perforations are arranged when excavating a corner portion where the direction in which the perforations are arranged changes. Further, in this embodiment, a cantilever-shaped steady rest 4 is extended from the lower part of the leader 2, and a casing pipe 11 is inserted through the holding part 4a of this steady rest 4, so that the casing pipe 11 holds the steady rest in the vertical direction. Improves power.

Inside the casing pipe 11 provided in this way, there is a rotating main shaft 1 rotated by a drive device 10.
3 is inserted through the casing tube 11, and a rotary branch box 14 is disposed at the lower end of the casing tube 11.

In this rotary branch box 14, there are three
Three auger shafts 15 with wing excavation heads 15a are suspended, and this rotary branch box 1
Two stirring shafts 16 with screws wrapped around them are extended upwardly from both sides of the top surface of the box 4 as stirring parts 16a, and furthermore, inside the rotary branch box 14, these auger shafts 15 and stirring shafts 16 are provided. A rotation transmission mechanism 20 that transmits the rotation of the rotating main shaft 13 is provided. Note that the excavation head 15a of the auger shaft 15 and the stirring portion 16a of the stirring shaft 16 are not limited to those of this embodiment, but can be changed as appropriate depending on the soil quality of the ground to be excavated.
Next, the rotation transmission mechanism 20 used in this embodiment will be explained based on FIG. A sub-transmission shaft 23 is disposed on both sides of the main transmission shaft 21 via an intermediate shaft 22, and a main gear 24 fixed to the main transmission shaft 21 and a sub-gear fixed to the intermediate shaft 22 are arranged on both sides of the main transmission shaft 21. 25 are engaged with each other, and as the transmission main shaft 21 rotates, the intermediate shaft 22
is rotated in the opposite direction to the transmission main shaft 21, and the chain 27 is wound around the sprockets 26, 26 provided on both the intermediate shaft 22 and the transmission sub-shaft 23, and as the intermediate shaft 22 rotates, the transmission sub-shaft 21 is rotated. The shaft 23 is rotated in the same direction as the intermediate shaft 22, that is, in the opposite direction to the main transmission shaft 21. A short auger shaft 15 is detachably connected to the lower end of the transmission main shaft 21 provided at the center, and long auger shafts 15 are detachably connected to the lower ends of the transmission sub-shafts 23 on both sides. At the top end of each is a stirring shaft 1.
6 are removably connected to each other, and as the rotation main shaft 13 rotates, the auger shaft 15 and stirring shaft 16 rotate. In this embodiment, such a rotation transmission mechanism 20 is used, but the rotation transmission mechanism 20 is not limited to this, and may be a mechanism that can transmit the rotation of the rotation main shaft 13 to the auger shaft 15 and the stirring shaft 16. Any mechanism can be used; for example, it is also possible to use a gear mechanism or a chain sprocket mechanism. However, when using the rotation transmission mechanism 20 shown in this embodiment, a gear with a smaller diameter can be used compared to a gear mechanism alone, and the rotation transmission box 14 can be made smaller to reduce the upper pressure during lifting. In addition, with only a chain sprocket mechanism, each auger shaft 15 rotates in the same direction and there is a risk of twisting, but in this embodiment, as described above, the auger shaft 15 in the center and the auger shafts 15 on both sides rotate. Since the auger shaft 15 rotates in the opposite direction, there is an advantage that there is no risk of twisting due to torque operation. Furthermore, in this embodiment, since these auger shafts 15 and stirring shafts 16 are connected detachably as described above, these shafts 15, 16
It is designed to be easy to replace if it is damaged or to replace it depending on the ground to be drilled. In addition,
Although this embodiment shows an example in which there are three auger shafts 15 and two stirring shafts 16, the number of auger shafts 15 and stirring shafts 16 can be changed as necessary. .

Further, in this embodiment, as shown in FIG. 3, a holder 30 for holding the upper end of each stirring shaft 16 extending upward from the rotary branch box 14 is provided in the casing pipe 11 to prevent swinging of the stirring shaft 16. In addition to preventing this, a lifting head 31 that rotates in conjunction with the stirring shaft 16 via a holder 30 is provided above one of the stirring shafts 16 to remove soil, etc. above when pulling up the excavator A from the hole. An injection device 32 is provided above the other stirring shaft 16 for supplying a soil conditioner through a holder 30, and the soil conditioner is injected into the hole through the stirring shaft 16 and the auger shaft 15. It is configured as follows. In this embodiment, as described above, different parts such as the pulling head 31 and the injection device 32 are provided above each stirring shaft 16, but only the pulling head 31 is provided above each screw shaft 16. , and the injection device 32
Of course, it is also possible to change it so that only the following are deployed.

Further, in this embodiment, guide wings 33 each having an arcuate cross section are provided on both sides of the holder 30, and when drilling a hole, each guide wing 33 slides along the hole wall while being in contact with the hole wall. This is to further improve the accuracy of perforation in the vertical direction.

Next, a case will be described in which the ground is excavated by the excavator A configured as described above. In this case, the excavator A is suspended by a crawler crane 1 or the like, the casing pipe 11 is fixed to the drive device 10,
The rotating main shaft 13 is rotated by the drive device 10,
This rotation is transmitted to each auger shaft 15 and agitation shaft 16 by a rotation transmission mechanism 20 provided in the rotary branch box 14, and these are rotated. 3, move it downward. At this time,
The excavator A maintains verticality by the fixed casing pipe 11, and performs straight drilling, and as the drilling progresses, the guide wings 33 provided on both sides of the holder 30 come into contact with the hole wall, and the hole wall By sliding along the axis, the holding force in the vertical direction is further improved, and the inside of the drilled hole is sufficiently stirred not only by the rotation of the auger shaft 15 but also by the rotation of the stirring shaft 16.

On the other hand, when the excavator A is pulled up from the hole after drilling in this way, the rotation of the stirring shaft 16 removes the earth and sand that has accumulated above, reducing the earth pressure applied during pulling up. be.

Moreover, when excavating a corner part with this excavator A, after excavating as described above and pulling up the excavator A from the hole, the fixation of the casing pipe 11 fixed to the drive device 10 is released. , the casing pipe 11 is rotated by a required angle with respect to the drive device 10, and the rotary branch box 14 at the lower end of the casing pipe 11 is rotated accordingly.
After that, the casing pipe 11 is fixed, and excavation is carried out in the same manner as described above.

As detailed above, in the excavator according to the present invention, the casing pipe is suspended from the drive device, and the holding force in the vertical direction is increased by the casing pipe, and a plurality of auger shafts are provided at the lower end of the casing pipe. These auger shafts are rotated by a rotating main shaft that is suspended from a rotary branch box and inserted into the casing pipe, making the auger shafts significantly shorter than before. This makes it possible to perform straight holes in an accurate position, and even when performing consecutive holes, the auger shaft does not shift in the direction of the previously drilled hole, making it possible to perform continuous drilling. It will become.

In addition, in this invention, the long auger shaft is not suspended from the drive device as in the past, so
Material costs required for the auger shaft are significantly reduced,
Manufacturing and maintenance costs are lower, the weight of the excavator is lighter, making it easier to handle, and the center of gravity is located lower, which improves stability when suspended by a crawler crane, etc. It is.

Further, in this invention, since the casing pipe is provided so as to be rotatable relative to the drive device,
When excavating a corner part, the alignment direction of each auger shaft can be changed simply by rotating the casing pipe, making it extremely easy to excavate a corner part.

Furthermore, in this invention, a stirring shaft having a stirring part such as a screw extends upward from the rotating branch box, and this stirring shaft is rotated together with the auger shaft by the rotating main shaft. When the excavator is pulled out of the hole, the stirring shaft sufficiently stirs the inside of the hole, and when the excavator is pulled up from inside the hole, the stirring shaft removes the soil, etc. above, making it extremely easy to pull up. It is.

[Brief explanation of drawings]

Fig. 1 is a front view showing the state of the drive device and auger shaft in a conventional example, Figs. FIG. 3 is a partially cutaway front view, and FIG. 4 is a front view showing a rotation transmission mechanism provided in the rotation transmission box. A... Excavator, 10... Drive device, 11... Casing pipe, 13... Rotating main shaft, 14... Rotating branch box, 15... Auger shaft, 15a... Excavation head, 16... Stirring shaft, 16a ... Stirring section,
20...Rotation transmission mechanism.

Claims (1)

[Claims] 1. A casing pipe suspended from a drive device is provided so as to be rotatable and fixed relative to the drive device, a rotating main shaft rotated by the drive device is inserted into the casing pipe, and a rotary branch box is provided at the lower end of the casing pipe. A plurality of auger shafts having excavation heads at their tips are suspended from the rotary branch box, and a plurality of stirring shafts having stirring portions are extended upwardly, and the rotation of the main shaft is controlled within the rotary branch box by the auger shaft and the auger shaft. An excavator characterized by being provided with a rotation transmission mechanism for transmitting rotation to a stirring shaft.