JP2834555B2 - Drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a drilling rig.

(B) Conventional technology Conventionally, in order to construct an underground wall for earth retaining or water blocking, etc., excavation is performed by lapping the ground with a number of excavation holes.
There is a technology that mixes the solidifying agent into the excavated soil in the drilling hole and builds the underground wall by solidifying the admixture.To ensure that the excavated soil and the solidifying agent are mixed, rotate the rotating shafts in opposite directions to each other. There has been invented an excavator in which a double shaft composed of rotating inner and outer shafts is provided, and a stirring blade is connected to each of the inner and outer shafts, and the excavated soil and the solidifying agent are mixed by inversion of each stirring blade.

(C) Problems to be Solved by the Invention However, in the above-described excavator, the rotating shaft is configured as a double shaft, and further, the inner and outer shafts coaxially arranged are rotated in opposite directions. For example, since a complicated driving device such as a contra-rotating gear device using a planetary gear mechanism is required, the device is disadvantageously expensive.

(D) Means for Solving the Problems According to the present invention, a plurality of rotating shafts are erected in parallel, adjacent rotating shafts are rotated in opposite directions, and a drilling blade is provided at the lower end of each rotating shaft. And a cylindrical shaft portion is loosely fitted to each rotary shaft, a winding transmission device is interposed between one rotary shaft and the other cylindrical shaft portion, and the other rotary shaft and one cylindrical shaft are interposed. A winding transmission device is interposed between the shaft and the shaft, and a stirring blade connected to the cylindrical shaft is mounted on the outer periphery of one of the rotating shafts at a position above the drilling blade, and the other rotating shaft is mounted. On the outer periphery of the shaft, a stirring blade connected to the cylindrical shaft portion was mounted at a position above the excavating blade, and each stirring blade was rotated in a direction opposite to the rotation axis on which each stirring blade was mounted. A drilling rig characterized by the above is provided.

(E) Function / Effect According to the present invention, since each stirring blade rotates in the direction opposite to the rotation axis on which the stirring blade is mounted, the stirring blade is separately stirred on the outer peripheral surface of each rotation shaft inside the stirring blade. By protruding the wings,
These agitating blades are inverted, so that the excavated soil and the solidifying agent can be reliably mixed.

As described above, a complicated driving device such as a contra-rotating gear device is not required by using the planetary gear mechanism, and the stirring blade can be contra-rotated by a simple and inexpensive device such as a wrapping transmission device. The drilling rig can be manufactured at low cost.

In order to rotate the adjacent rotating shafts in opposite directions, an inexpensive transmission device such as a normal spur gear device can be used.

(F) Example An example of the present invention will be described in detail with reference to the drawings.

In FIG. 1, (A) shows an excavator for building an underground wall, and a leader (2) is erected on a self-propelled heavy machine body (1), and the leader (2) is installed on the leader (2). Two motors (3a) and (3b) rotating in opposite directions are mounted to be able to move up and down, and two rotating shafts (5a) are provided at the lower ends of the motors (3a) and (3b).
(5b) are vertically suspended in parallel with each other, and excavation blades (6) (6) are continuously provided at the lower ends of the rotating shafts (5a) and (5b).

Also, as shown in FIG. 2, each excavation blade (6) (6)
Stirring blades (7) and (7) are arranged above the
Each stirring blade (7) (7) has an inner stirring blade (7a) (7b) protruding from each rotating shaft (5a) (5b) and surrounds the outer periphery of each inner stirring blade (7a) (7b). The outer stirring blades (8a) and (8b) are rotatably mounted on the rotating shafts (5a) and (5b).

(Ma) and (Mb) are winding type transmission devices, and the outer stirring blades (8a) and (8b) have cylindrical shafts (10
a) To the V-pulley (pa) (pb) attached to (10b) and the rotation shaft (5a) (5b) different from the rotation shaft (5a) (5b) to which each outer stirring blade (8a) (8b) is attached Installed V pulley (qa) (qb)
, A plurality of V-belts are wound and suspended respectively.

(11a) and (11b) are casings housing the wrapping type transmission devices (Ma) and (Mb), and each casing (11a) (1
A shaft sealing device to prevent muddy soil from entering the inside of the casing (11a) (11b) between the rotating shafts (5a) (5b) and the cylindrical shaft portions (10a) (10b) of 1b) (E) is incorporated.

It should be noted that, in addition to the above-mentioned V-belt, a chain conduction mechanism can be used for the wrapping transmission device (Ma) (Mb), and a V-packing,
A gland packing, an oil seal, an O-ring, and a mechanical seal cylinder can be used.

(B) is a solidifying agent injection device, which pumps the solidifying agent,
Swivel (20) provided at the upper end of each rotating shaft (5a) (5b)
And a passage (21) formed inside each rotating shaft (5a) (5b)
The solidifying agent is spouted into the excavated soil from the spouts (22) at the lower ends of the rotating shafts (5a) (5b).

The embodiment of the present invention is configured as described above, and rotates the motors (3a) and (3b) of the excavator (A) in directions opposite to each other, and moves the motors (3a) and (3b) along the reader (2). ), The drilling blades (6) and (6) connected to the lower end of each of the rotating shafts (5a) and (5b) have substantially circular drilling holes (H) wrapped with each other on the ground (G). Drilling.

The excavated soil generated during the excavation work is excavated (H)
In the inside, the inside and outside stirring blades (7a) (7b) (8a) (8
According to b), the mixture is mixed with the solidifying agent that is pressure-fed from the solidifying agent injection device (B) and jetted out from the jet port (22) to become an admixture (K), which solidifies after a curing period to form a cast-in-place pile.

When mixing the excavated soil, the inner stirring blades (7a) (7b) fixed to the rotating shafts (5a) (5b) and the rotating shafts (5a) (5b)
Since the outer stirring blades (8a) and (8b), which are rotatably mounted on each other, are rotating in opposite directions to each other, the excavated soil and the solidifying agent are effectively stirred, and a uniform admixture (K) is obtained at each part. Can be generated and the reliability of cast-in-place piles can be increased.

In addition, the casings (11a) and (11b) provided above and below the stirring blades (7) and (7) restrict the lateral runout of each of the rotating shafts (5a) and (5b), and interfere with the stirring blades (7) and (7). And drill hole (H)
Can be prevented.

Also, the upper end of each rotating shaft (5a) (5b) is connected to a gear box with a built-in spur gear mechanism, and each rotating shaft (5a) (5
b) is rotated by one motor in opposite directions.

FIG. 3 shows another embodiment of the excavator, in which a motor (40) and a rotating shaft (50) are wound around a power transmission mechanism (5).
In 1), the rotary shaft (50) can be slid in the insertion and removal direction with respect to the power transmission mechanism (51), but can be inserted into the power transmission mechanism (51) so that it cannot rotate, and the rotary shaft (50) can be raised and lowered. By this, the motor (40) and the power transmission mechanism (51) can be attached to the front end (52) of the heavy equipment body (1), and these heavy objects can be arranged at a low position. In addition, the size of the excavator is reduced, and the center of gravity of the excavator is lowered to enhance stability.

Also, as shown in the figure, the joints (53) and (54) are provided at the upper end of the rotating shaft (50), and the extension shaft (55) is connected, so that the cast-in-place pile reaching the deep part of the ground (G) can be formed. It can be cast.

Although the above describes an example of an excavator having two rotating shafts rotating in opposite directions to each other, the present invention can also be applied to an excavator having three or more rotating shafts. it can.

[Brief description of the drawings]

FIG. 1 is a front view of an excavator, FIG. 2 is an enlarged sectional view of a wrapping type transmission device, and FIG. 3 is an explanatory diagram of a wrapping type transmission device. (A): Excavator (G): Ground (H): Drilling hole (K): Mixture (Ma) (Mb): Wound transmission device (5a) (5b): Rotating shaft (6) (6) : Drilling blade (7) (7): Stirrer

Claims (1)

(57) [Claims] 1. A plurality of rotating shafts (5a) and (5b) are erected in parallel, adjacent rotating shafts (5a) and (5b) are rotated in directions opposite to each other, and each rotating shaft (5a) (5b) is rotated. ), Drilling blades (6) and (6) are connected to each other at the lower end, and each rotating shaft (5a) (5)
b) The cylindrical shafts (10a) and (10b) are loosely fitted into
a) and another cylindrical shaft part (10b), a winding transmission device (Ma) is interposed therebetween, and a winding mechanism between the other rotary shaft (5b) and one cylindrical shaft part (10a). A stirring transmission device (Mb) is interposed, and a stirring blade connected to the cylindrical shaft portion (10a) is mounted on the outer periphery of one of the rotating shafts (5a) at a position above the excavating blade body (6).
In addition, a stirring blade connected to the cylindrical shaft portion (10b) is attached to the outer periphery of the other rotating shaft (5b) so as to be located above the excavating blade body (6). An excavator characterized by being rotated in a direction opposite to the rotation shafts (5a) and (5b) attached thereto.