JPS6332953B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a suspended excavation method and its equipment, and in particular to a suspension type excavation method and its equipment, and in particular, a method for reducing the reaction torque that an excavator receives during excavation by spreading the reaction torque between the excavator and the ground side. This invention relates to a suspended excavation method that is supported by a tension rope and its equipment.

[Background of the invention]

As is well known, an excavator excavates by applying rotational force to a drill bit installed at its lower end, so when excavating, the excavator receives a drilling reaction torque in the direction opposite to the direction of rotation of the drill bit. . Therefore, in conventional general excavators, such excavation reaction torque must be received on the ground side, so the leader is assembled on the ground side to receive the excavation reaction torque, or the leader is assembled on the ground side to receive the excavation reaction torque on the ground side. The excavation reaction torque is received by the bit, or the excavation equipment body is placed on the ground side to support the excavation reaction torque that the bit receives. However, assembling the leader, tank, etc. is time-consuming, and it may not be possible to assemble the leader, turret, etc., especially in special areas such as slopes and mountainous areas.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to propose a suspended excavation method and its equipment that do not require a leader, turret, etc. to receive the excavation reaction torque of an excavator.

[Summary of the invention]

The present invention suspends an excavator, stretches a tension rope between one side of the excavator and the ground side, and uses this tension rope to apply tension in the tangential direction opposite to the rotational direction of the excavation reaction. It is characterized by receiving torque.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the suspended excavation method and apparatus thereof according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows the structure of a first embodiment of the present invention. In FIG. 1, a drill rod 10 is constructed by connecting a plurality of rods formed to a predetermined length from the ground side, and an air hammer device 12 is provided at the lowest end of the drill rod 10.
The air hammer device 12 applies a vertical impact force to a drill bit 13 provided at its lower end. This drill bit 13 excavates while being given a rotational force by a rotational drive source 16, which will be described later, in addition to the impact force in the vertical direction. A rotary drive source 16 is provided at the upper end of the drill rod 10 via a speed reducer 14, and the drill rod 10 is provided with rotational force by this rotary drive source 16. An excavator comprising a drill rod 10, an air hammer 12, a drill bit 13, a rotary drive source 16, etc. is suspended by a crane 18.

Tension rope 2 on one side of the excavator and on the ground side
8 is stretched out. That is, the upper end of the tension rope 28 is fixed to the case 15 of the reducer 14 of the excavator, and the other end of the tension rope 28 is fixed to the winch 30.
installed on. The direction of the tension provided by the tension rope 28 is biased so as to be applied in a tangential direction opposite to the direction of rotation A of the excavation reaction that the excavator receives during excavation, as shown in FIG. A rope 29 is provided on the opposite side of the reduction gear 14 from the tension rope 28.
is stretched by another hook of the crane 18 via a pulley 31, and restrains the excavator to prevent it from inadvertently attempting to reversely rotate.

The member indicated by 32 in FIG. 1 is a compressor, which sends air into the drill rod 10 through a hose 34 and moves a piston ram (not shown) in the air hammer device 12 up and down to apply an impact force to the drill bit 13. .

The operation of the embodiment of the present invention constructed as described above is as follows. First, a drill rod 10, an air hammer 12, a drill bit 13, and a rotational drive source 16
An excavator consisting of the following equipment is suspended by a crane 18. Next, the tension rope 28 is stretched so as to provide tension in the tangential direction opposite to the rotational direction of the excavation reaction torque that the excavator receives during excavation. Further, a rope 29 for preventing reverse rotation is attached to the opposite side of the excavator. In this state, the drill bit 13 rotates while applying an impact force to proceed with drilling. When the excavator receives excavation reaction torque in the direction of arrow A as shown in Fig. 2 during excavation, the tension rope 28 is set so that a constant tension is applied by the winch 30, and the direction is the excavation reaction rotation direction. A
Since the excavation reaction torque is applied in the tangential direction opposite to the tension rope 28, the excavation reaction torque is supported by the tension rope 28, so that excavation can proceed. The winch 30 is set in advance to apply a predetermined tension to the tension rope 28, and is configured to wind up the tension rope 28 as the excavator descends and to pay out the tension rope 28 as the excavator ascends. It's getting old. Further, if the excavator rotates in the opposite direction for some reason, the rope 29 receives the rotational force.

In the second embodiment shown in FIG. 3, one winch is used for one tension rope so that the excavation reaction torque is received on both sides. That is, one end 42 of the tension rope 40 is fixed to the ground side, and the other end is provided to the winch 30 via sheaves 44, 46, 48, and 50 provided in the case 15 of the reduction gear 14. Case 1 of reducer 14
As shown in FIG. 4, a tension rope 40 is stretched over the sheaves 46 and 48 arranged in the 5th embodiment in an S-shape, so that the excavator can move in the excavation reaction rotation direction A and in the same manner as in the first embodiment. Tension is provided in opposite tangential directions to support the reaction torque experienced by the excavator. In the second embodiment, as in the first embodiment, a constant tension is applied to the tension rope 40 by the winch 30, and as the drill rod 10 descends, the tension rope 40 When the drill rod 40 is raised, a tension rope 40 is let out from the winch 30 to apply a constant tension. In the second embodiment, as in the first embodiment, the leader, tower, etc. are not required, and the excavator is equipped with a crane 1.
Excavation can be proceeded with simply by hanging it with 8.

In the above embodiment, an example in which the air hammer device 12 is used in an excavator has been explained, but the invention is not limited to air hammer excavation, and can also be applied to other excavation methods such as earth auger excavation, large diameter excavation using a digging pipe, etc. The present invention can be applied.

〔Effect of the invention〕

As explained above, according to the suspended excavation method and its device according to the present invention, the excavator is suspended,
The excavation reaction torque that the excavator receives is received by a tension rope that is stretched between the excavator and the ground side and provides tension in the tangential direction opposite to the rotation direction of the excavation reaction, so conventional excavation reaction torque is received. This has the effect of eliminating the need for large-scale structures such as leaders and turrets that were necessary for this purpose.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the structure of the first embodiment of the present invention, FIG. 2 is a plan view taken along the line - on FIG.
FIG. 3 is an explanatory diagram showing a second embodiment according to the present invention,
FIG. 4 is a plan view taken along the top line in FIG. 3. 10...Drill rod, 12...Air hammer,
13...bit, 16...rotary drive source, 18...
Crane, 28...Tension rope, 30...
winch.

Claims (1)

[Claims] 1. An excavator equipped with a rotational drive source at the top and a drill bit at the bottom is suspended from above, a tension rope is stretched between at least one side of the excavator and the ground side, and the tension rope is suspended from above. A suspended excavation method characterized by applying tension to a rope in a tangential direction opposite to the rotational direction of the excavation reaction to receive the excavation reaction torque received by the excavator to perform excavation. 2. An excavator is equipped with a rotational drive source on the upper part and a drill bit on the lower part, and is suspended from above. A suspended excavation device consisting of a tension rope that applies tension in a tangential direction opposite to the direction of rotation, and a tension adjustment device provided on the ground support part of the rope. 3. The hanging excavator according to claim 2, characterized in that a rope for preventing reverse rotation is stretched between the other side of the excavator and the ground side.