JPH0344193B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-spindle excavator, and more particularly to a method for adding a drilling rod.

When improving the ground by constructing earth retaining walls or deep mixing, multi-axis drilling involves installing two or several drilling rods in parallel and driving them all at once to excavate a row of vertical holes underground. A machine is used.

However, if it is necessary to excavate a deep hole in a location where it is not possible to use a multi-axis excavator with a long excavation rod, the excavation rod connected to the drive unit excavates to a predetermined depth, and then the excavation rod is A method is used to continue excavation by adding an additional rod to the upper end of the excavation.

On the other hand, multi-shaft excavators are divided into independent drive types, in which each excavator rod has a drive motor, and each excavator rod is connected to the output shaft of the corresponding motor so that each excavator is driven independently, and a multi-axis excavator has a single motor. There is also a merging type that drives multiple drilling rods at the same time via a gear system.

In any type of multi-shaft excavator, the connecting end of the drilling rod has, for example, a hexagonal protruding shaft and a hexagonal hole into which the hexagonal protruding shaft aligns and fits. After the two are mated together, a pin that penetrates through a part of the protruding shaft is used to prevent rotation and removal, but when connecting, the alignment position of the protruding shaft and the hole does not match reliably. It is not easy to align the two.
In the case of an independently driven multi-shaft excavator, each excavator rod can be rotated individually for alignment, but it is very difficult to stop the motor at a predetermined position. In addition, in the case of a combined type multi-shaft excavator, the positions of all output shafts do not necessarily match, which poses the difficulty of having to align the positions of each output shaft and connect them.

In view of this, the present invention holds the replenishment rod by a replenishment holder, brings this holder between the drive part and the excavation rod buried underground, and connects the replenishment rod by rotating it at this position. Align the protruding shaft on the end with the hole, and when they are aligned, raise the additional rod to connect the output shaft of the drive section and the additional rod. After connection, lower the drive section and connect the additional rod. The present invention provides a method for adding a drilling rod to a multi-shaft excavator, which solves the conventional problems by connecting the drilling rod to an underground drilling rod.

The present invention will be described below with reference to embodiments shown in the drawings.

For convenience, the embodiment shown in the figure uses two drilling rods 1.
In the case of a multi-axis excavator having A and 1B, the excavator is installed on a tower 3 installed on a base machine 2.
A drive unit 4 equipped with a motor, reducer, etc. is mounted on the front of the
is suspended by a wire rope 6 along a guide rail so that it can be raised and lowered freely, and can be driven up and down by a winch mounted on the base machine 2.
Output shafts 7A and 7B protruding from the lower surface of this drive section 4
Excavation rods 1A and 1B are connected to the excavation rods 1A and 1B.

The replenishment holder 9 that holds the replenishment rods 8A, 8B has an upper holder 10 and a lower holder 11 in the embodiment shown in FIGS. 3 to 5, which are attached to the tower. 3
It is supported by upper and lower arms 12 that can pivot around the tower 3 so as to protrude to one side of the tower.

The upper holder 10 has holes 13, 13 through which the addition rods 8A, 8B are inserted, and the lower holder 11 has holes 13, 13 through which the addition rods 8A, 8B are inserted, and the lower holder 11 allows the addition rods 8A, 8B to rotate freely, as shown in an enlarged cross section in FIG. It has means for supporting and means for raising and lowering.

The rotating means is driven by motors 16, 16 which are meshed with gears 15, 15 which are rotatably supported by bearings 14, 14 in accordance with the spacing between the supplementary rods 8A, 8B. It consists of gears 17, 17 and hollow push-up shafts 18, 18 which are inserted through the axes of the gears 16, 16 so as to be movable in the axial direction by spline fitting, and the lifting means is the push-up shaft 18. , 18 are configured by hydraulic cylinders 19, 19 that push up the lower ends of the cylinders.
At the lower ends of the push-up shafts 18, 18 are chucks 20, 2 for holding additional rods 8A, 8B.
0 is set.

The upper and lower holders 10 and 11 are moved by the rotation of the arm 12 between an excavation position A directly below the drive unit 4 and a retracted position B, which is rotated approximately 90 degrees from this position and retracted, as shown in the plane in FIG. It is becoming more and more common. However, this additional holder 9 is
2, the tower 3 may be provided with a rotatable bearing, and the upper and lower holders 10, 11 may be directly attached to this bearing. In the figure, 21 is the additional rod 8A, 8B that has been raised, and the excavation rod 1 buried underground.
Adapter used for alignment connection with A and 1B, 2
2 is attached to the excavator side and the excavating rod 1A, 1
This is the lower steady rest that regulates the distance between B.

Next, embodiments of the method of the present invention shown in the above examples will be described with reference to FIGS. 5A to 5F.

When excavating a vertical hole underground, an excavator is installed as shown in Figures 1 and 2, and the first stage drilling rods 1A and 1B are used to excavate underground, and parallel vertical holes are drilled. .

When this first stage drilling is completed, the drilling rods 1A and 1B are separated from the drive unit 4 and the output shafts 7A and 7B. During this time, the upper holder 10 and the lower holder 1 are added at the retracted position opening.
1 and hold the rods 8A and 8B.
For this holding, the additional rods 8A and 8B are suspended by a crane or the like, and the holes 13 and 1 of the upper holder 10 are
3, the lower end is inserted into the push-up shafts 18, 18 of the lower holder 11, and held by the chucks 20, 20.

As mentioned above, when drilling is completed by the first stage drilling rods 1A, 1B, the output shafts 7A,
After separating the excavating rods 1A and 1B from the excavating rods 1A and 7B, the drive section 4 is raised as shown in FIG.
The replenishment holder 9 is rotated between the upper end of the hole 1B and aligned with the excavation position A.

Then, the upper end of one of the replenishment rods 8A, 8B supported by the replenishment holder 9 is aligned with each non-circular hole and the protruding shaft of one output shaft 7A of the drive section 4. At this time, if the hole and the protruding shaft are not aligned, remove the motor 1 on the additional rod 8A side.
6, the push-up shaft 1 is activated via gears 17 and 15.
8 is rotated, and the additional rod 8A fitted and held therein is rotated to align the hole and the protruding shaft. When these are aligned, pressure oil is supplied to the hydraulic cylinder 19 of the elevating means to extend the rod, and the push-up shaft 18 is raised to add additional rod 8A.
The upper end of the drive unit 4 and the output shaft 7A of the output shaft 7A are fitted with the hole and the protruding shaft, and a pin is driven to complete the connection as shown in FIG. 5B.

In addition, even if the holes and protruding shafts of the other extension rod 8B and the output shaft 7B of the drive section 4 are not aligned, the motor 16 on that side is driven and aligned in the same manner as described above, and the positions are aligned. At this point, as shown in FIG. 5C, the connecting rod 8B is raised and connected in the same manner as above.

Then, the lower end of the supplementary rod 8A already connected to the output shaft 7A of the drive section 4 and the upper end of the underground excavating rod 1A are connected by an adapter 21 as shown in FIG. 5D.

In this way, the lower end of the joint rod 8B added later is aligned with the hole of the underground excavation rod 1B and the protruding shaft. To do this, either drive the motor 16 of the lower holder 11 and turn the addition rod 8B, or if the drive section 4 is a combined type, drive the drive section 4 and turn the addition rod 8A and the other addition rod 8B. Turn it and do it.

When the above alignment is completed, remove the refill holder 9 from the refill rods 8A and 8B as shown in FIG.
Lower the drive unit 4 and add additional rod 8 as shown.
The connection is completed by fitting the holes and protruding shafts of the lower ends of the rods A and 8B and the upper ends of the underground excavation rods 1A and 1B to complete the connection.

In this way, the excavation is continued by the supplementary rods 8A and 8B, and when the supplementary rods 8A and 8B are also buried underground, the drilling of the vertical hole is continued by connecting the next supplementary rod using the same operation as described above. Let's do it.

In the above embodiment, the upper holder 10 and the lower holder 11 are provided in the replenishment holder 9, and the lower holder 11 is provided with a rotating means and a lifting means for the replenishment rods 8A and 8B.
These can also be implemented using the lower steady rest 22.

In this example, as shown in FIG. 6A, the additional holder 9 is composed of only the upper holder 10,
17, motor 16, 16, push-up shaft 18, 18,
The hydraulic cylinders 19, 19, etc. are installed inside the lower steady rest 22.

Since the replenishment process is the same as in the previous embodiment, FIGS. 6A to 6E are shown in correspondence with FIGS. do.

In addition, in the above embodiment, the additional holder 9
Alternatively, an example has been described in which the rotation of the additional rods 8A, 8B can be adjusted by rotating the push-up shafts 18, 18 using the gears 15, 17 in the lower steady rest 22 and the motors 16, 16.
For example, the rod 8A added to the push-up shafts 18, 18,
If the rotation can be adjusted manually or by other means while holding 8B, it is possible to implement it without using the above example.

As explained above, the present invention allows the replenishment rod to be held in the replenishment holder in advance at a retracted position outside the excavation position, and when the first stage of excavation is completed, the excavation rod and the drive section are connected to each other. By pivoting the replenishment holder while they are separated and separated, all the replenishment rods can be positioned at the same time in a predetermined position, and then the replenishment rods are rotated to align them with the holes in the connecting ends. Since the connection is made by aligning with the shaft, there is an excellent effect that even a multi-shaft excavator requiring a large number of additional rods can be connected with high efficiency.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of an excavator implementing the present invention, Fig. 2 is a front view of the same, Fig. 3 is a plan view showing an example of a supplementary holder, and Fig. 4 is a sectional view of the lower holder. , FIGS. 5A to 5F are explanatory diagrams showing the replenishment process of the same replenishment rod, and FIGS. 6A to 6E are explanatory diagrams showing the replenishment process of another embodiment. 1A, 1B drilling rod, 3...tower, 4...
Drive section, 7A, 7B... Output shaft, 8A, 8B...
Additional rod, 9...Additional holder, 10...Upper holder, 11...Lower holder, 18...Push-up shaft.

Claims (1)

[Scope of Claims] 1. A multi-shaft system that has a drive unit that can be raised and lowered along a tower installed on the ground, and that excavates multiple vertical holes at the same time by connecting a drilling rod to each of the output shafts of the drive unit. In an excavator that uses an excavator, a supplementary holder is provided around the tower that can be rotated between an excavation position and a lateral retreat position, and the supplementary holder is equipped with the same number of couplings as the output shaft of the drive unit in advance. After the excavation rod is held to a predetermined depth by the first stage excavation rod, the output shaft of the drive section is separated from the excavation rod, the drive section is raised, and the addition rod is placed between the drive section and the excavation rod. Rotating the holder and rotating the supplementary rod manually or by a motor or the like to align the non-circular hole at the connecting end of the output shaft of the drive unit and the supplementary rod with the matching non-circular protruding shaft; Next, the replenishing rod is raised by a lifting means provided on the refill holder, etc., and the hole and the protruding shaft are fitted and connected, and the other refill rods supported by the refill holder are moved in the same manner as above. Align the output shaft and the protruding shaft with the hole of the replenishment rod and connect upwardly, and after continuing all replenishment rods, rotate and retract the empty replenishment holder to the side retraction position. While setting the next supplementary rod, the drive section is lowered and the lower end of the supplementary rod connected to this drive section is connected to the upper end of the underground drilling rod to continuously excavate multiple vertical holes. A method for adding a drilling rod to a multi-axis excavator, characterized by the following. 2. An excavating rod joint for a multi-axis excavator according to claim 1, wherein the replenishing rod is rotated and raised by a motor and a fluid cylinder mounted on a lower holder of the replenishing holder. How to add. 3. The replenishing rod is rotated and raised by a motor and a fluid cylinder mounted on a lower steady rest that restrains the excavating rods and keeps the distance constant. How to add a drilling rod to a multi-axis excavator. 4. The rotation of the replenishment rod is performed manually or by other means while the replenishment rod is held in a lower holder or a lower steady rest of the replenishment holder. The method for adding a drilling rod to a multi-axis excavator described above.