JP2009138461A - Torque increasing device for use in casing rotating/propelling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque increasing device which can generate large torque by a simple structure to temporarily increase the torque when a casing is rotated by a motor of a propeller, in order to re-start propulsion of the casing after termination of the propulsion. <P>SOLUTION: The torque increasing device is formed of: a wire drum 34 detachably attached to a joint at a rear edge of the casing 12 extending rearward from the propeller; a first wire rope 44 wound on the wire drum 34 in the same direction as a rotating direction of the casing 12; a second wire rope 45 wound on the wire drum 34 in a direction opposite to the winding direction of the first wire rope 44; a fixed pulley 38 having the second wire rope 45 wound thereon, and fixed to the ground in order to change the direction of the second wire rope 45; and a running block 36 having a free end of the first wire rope 44 and a free end of the second wire rope 45 connected thereto, and pulled by a winding-up device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a torque-up device used for a rotary propulsion device in which a steel pipe such as a casing is buried in the ground, and in particular, a torque that can temporarily apply a large torque when propulsion is temporarily stopped and then resumed. It relates to an up device.

  In recent years, in the lifeline burial work such as water and sewage, gas, electric cable, etc., the non-cutting method in which the pipe is pushed horizontally from the shaft is widely used instead of the cut method. In this type of propulsion method, a propulsion device is put into a shaft excavated from the ground surface, and the casing is rotated by the propulsion device while simultaneously pushing the rear end. A casing having a cutter head at the tip is attached to the propulsion unit as an attachment, and the earth and sand are dug by the cutter head, and the earth and sand are discharged to the shaft by the blade and the water supplied. Then, after a certain distance has been dug, the casing is pushed forward while being added.

  In addition, since buried pipes buried in the ground as lifelines such as water and gas are aged over time, it is necessary to collect them in a timely manner and replace them with new buried pipes. Moreover, when the buried pipe is no longer needed, it is necessary to collect it without leaving it as it is. In order to recover such existing buried pipes, in the old days, buried pipes were dug by excavating the buried parts, but recently, a casing is formed outside the existing buried pipes by using the rotary propulsion method. Since then, buried pipes are being collected. According to this rotation propulsion method, the accuracy is good and the efficiency of construction is improved.

  In the conventional method using a rotary propulsion device, torque may vary in the process of propelling the casing, and depending on the soil, a large torque may be required to rotate the casing.

  When the propulsion of the casing is stopped halfway and restarted after a while, the earth pressure is applied and a particularly large torque is required. Depending on the situation, due to insufficient capacity of the drive motor, the torque is insufficient and the casing cannot be propelled. For this reason, conventionally, a large propulsion device having a motor with a large capacity has been used to cope with a torque shortage.

  However, on the other hand, after resuming propulsion, it is always the case that the torque required for the rotation of the casing decreases, and when propelling smoothly, propulsion is possible even if it is not a large capacity motor. .

  However, in reality, there has been a tendency to use a large propulsion device having a large-capacity motor on the basis of the torque output required when resuming propulsion. For this reason, there is a problem that the shaft for inserting the large propulsion device has to be greatly cut, the use cost of the propulsion device increases, and the construction cost increases more than necessary.

  Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art and restart the casing after stopping the casing. Therefore, when the casing is rotated by the motor of the propulsion device, a large torque is generated with a simple configuration. An object of the present invention is to provide a torque-up device that can generate and temporarily increase torque.

  In order to achieve the above object, the present invention provides a torque increase device for temporarily increasing a torque for rotating a casing in a propulsion unit that propels the casing into the ground without cutting, the propulsion unit. A wire drum that is detachably attached to a joint at the rear end of the casing that extends rearward of the casing, a first wire rope that is wound around the wire drum in the same direction as the rotation direction of the casing, and the winding of the first wire rope A second wire rope wound around the wire drum in a direction opposite to the direction; a fixed pulley around which the second wire rope is wound and fixed to change the direction of the second wire rope; The movement that the free end of the wire rope and the free end of the second wire rope are connected and pulled by the hoisting device And car and is characterized in that it consists of.

  In the present invention, preferably, the wire drum has a first wire rope that is wound clockwise from the center of the drum cylinder toward the propulsion direction, and a second wire rope that extends from the center of the drum cylinder to the direction opposite to the propulsion. It is wound 3 to 5 times on each left-handed winding.

  Moreover, in this invention, a mobile crane is used for the said hoisting device, and the said fixed pulley can be hung on the hook of the said mobile crane.

  According to the present invention, when the casing propulsion is stopped and then restarted, the casing is rotated by the motor of the propulsion device, so that a large torque can be temporarily applied with a simple configuration. There is no need to use a large propulsion unit, and construction costs can be greatly reduced.

Hereinafter, an embodiment of a torque increase device used in a rotary propulsion method machine according to the present invention will be described with reference to the accompanying drawings.
In FIG. 1, reference numeral 10 indicates a rotary propulsion device used in a construction method in which a casing is propelled into the ground without cutting. A shaft 50 is dug from the ground surface, and the propulsion device 10 is installed in the shaft 50.

  The rotary propulsion device 10 is a machine that propels the casing 12 by applying a propulsive force while rotating the casing 12. The main body of the rotary propulsion device 10 is movably installed on a guide frame 14 serving as a base. Hydraulic cylinders 16 that generate a propulsive force are disposed at the four corners of the rotary propulsion device 10 in the vertical and horizontal directions. A reaction force receiving rod 18 extends behind the rotary propulsion unit 10 to receive a reaction force when a propulsive force is applied to the casing 12, and is fixed to the wall surface of the shaft 50.

  The rotary propulsion device 10 is provided with a hydraulic motor 20 that generates torque for rotating the casing 12. A cutter head 22 is provided at the tip of the casing 12, and a blade 24 (inner winding blade) is spirally welded inside the casing 12. The cutter head 22 rotates with the casing 12 so that thrust is applied. The casing 12 is propelled while being propelled one by one as the propulsion is extended.

  In the present embodiment, in the construction in which the casing 12 is propelled by the rotary propulsion device 10, when the casing 12 is reworked after the casing is added, or when the propulsion is stopped during the night, a large starting torque is initially generated. In order to increase the starting torque required at this time, the following torque-up device is configured.

In FIG. 1, reference numeral 30 indicates the entire torque-up device.
This torque increase device 30 is an embodiment using a mobile crane. Reference numeral 31 is a wire rope hanging from a boom of a mobile crane (not shown). A pulley block 32 is suspended by the wire rope 31, and a crane hook 33 is attached to the pulley block 32.

  In this embodiment, the torque-up device 30 includes a wire drum 34 connected to the casing 12, a moving pulley 36 suspended by a mobile crane, and a fixed pulley 38 fixed to the ground.

Hereinafter, the configuration of the torque increase device 30 will be described in detail.
The rearmost end of the casing 12 that is added along with the propulsion is behind the rotary propulsion device 10. As shown in FIG. 2, the wire drum 34 is detachably attached to the joint 40 of the rearmost casing 12a. In this case, pin holes 41 and 42 are formed in the joint portion 40 and the wire drum 34, and the wire drum 34 is coupled to the joint portion 40 by pins (not shown).

  As shown in FIG. 2, two wire ropes 44 and 45 are wound around the wire drum 34 so as to be in opposite directions. Among these, the first wire rope 44 is wound in a clockwise direction in the same direction as the rotation direction of the casing 12. In this case, the winding of the first wire rope 44 increases clockwise from the center of the wire drum 34 toward the propulsion direction.

On the other hand, the winding of the second wire rope 45 increases in a counterclockwise direction from the center of the wire drum 34 in the direction opposite to the propulsion direction.
It is sufficient that the first wire rope 44 and the second wire rope 45 wound around the wire drum 34 are wound 3 to 5 times.

Next, FIG. 3 is a view of the wire drum 34 of FIG. 2 as viewed from the rear.
A fixed pulley 38 is fixed to the ground below the wire drum 34 by anchor bolts 46. A second wire rope 45 is wound around the fixed pulley 38. That is, the second wire rope 45 that is wound around the wire drum 34 and drawn downward extends with the fixed pulley 38 in the upward direction, and its free end is one end of the third wire rope 48. Are connected to each other through a shackle 49. The third wire rope 48 is a wire hung on the movable pulley 36 suspended from the crane hook 33.

  On the other hand, the free end of the first wire rope 44 wound around the wire drum 34 and drawn upward is connected to the other end of the third wire rope 48 via the shackle 50.

  The torque increase device according to the present embodiment is configured as described above. Next, the operation and effect thereof will be described.

When the casing 12 is being smoothly propelled by the rotary propulsion device 10, the torque increase device 30 is not required. FIG. 1 shows a rotary propulsion device 10 in which a torque-up device 30 is assembled to stop propulsion halfway and wait a while before resuming propulsion.
Therefore, the movable pulley 36 is attached to the crane hook 33 that hangs down from the boom of the mobile crane, and the torque-up device 30 is assembled as shown in FIG.

As shown in FIG. 4, when the movable pulley 36 is lifted by a mobile crane, torque is applied in the same direction as the rotation direction when the casing 12 is propelled to the wire drum 34.
That is, when the movable pulley 36 is lifted, the first wire rope 44 and the second wire rope 45 wound around the wire drum 34 are pulled upward. Of these, the first wire rope 44 is wound so that the wire drum 34 can be rotated clockwise in FIG. 4 when pulled vertically upward. Then, the second wire rope 45 is wound so as to rotate the wire drum 45 in the clockwise direction through the fixed pulley 38. Accordingly, when the movable pulley 36 is lifted up by the crane, torques T1 and T2 that cause the wire drum 45 to rotate clockwise are generated by the first wire rope 44 and the second wire rope 45, respectively.

  These torques T1 and T2 are added to the output torque of the hydraulic motor 20 and the like originally provided in the rotary propulsion device 10 and applied to the casing 12, so that not only a large-capacity power source is required, but also the pulley and the wire rope. With a simple configuration combining the above, the torque applied to the casing 12 can be temporarily increased only when propulsion is resumed. As a matter of course, the magnitudes of the torques T1 and T2 applied to the wire drum 34 can be increased regardless of the specifications of the rotary propulsion device 10 and the capacity of the hydraulic motor 10. For this reason, unlike the conventional case in which a propulsion unit larger than necessary must be used in accordance with the torque at the time of restart, if the hydraulic motor 10 has a capacity necessary for normal propulsion, the rotary propulsion unit 10 Can facilitate the promotion work. In this embodiment, the magnitude of the torque to be increased can be managed using a crane load meter within the range of the crane lifting capacity.

  Further, as in the present embodiment, after the first wire rope 44 and the second wire rope 45 are wound around the wire drum 34 in the reverse direction, the moving pulley 36 and the fixed pulley 38 are combined, so that they are equally symmetrical in the left-right direction. Since it can be pulled, the starting torque can be stably applied without applying a force that is biased to the casing 12 or the rotary propulsion device 10 holding the casing 12.

  Furthermore, in the torque-up device 30, if the first wire rope 44 and the second wire rope 45 are wound about 3 to 5 turns, it is necessary and sufficient to give the casing 12 an initial rotation with high torque. Usually, the friction from the ground is cut off when it is rotated 3 to 5 times, and after all the winding is completed, the casing 12 is rotated by the hydraulic motor 20 of the rotary propulsion device 10 to shift to the normal propulsion process. Can do. In that case, since it is only necessary to remove the pin from the joint portion 40 of the casing 12 and pull out the wire drum 34, the process can smoothly proceed to the propulsion process.

  As mentioned above, although the preferred embodiment was mentioned and demonstrated about the torque up apparatus by this invention, this invention can also replace a mobile crane with hoisting means, such as a hoist.

It is a side view which shows one Embodiment of the torque-up apparatus used for the rotary propulsion machine by this invention. It is a side view which shows the drum of the same torque up apparatus. It is the front view which looked at the same torque up apparatus from back. It is a front view explaining the effect | action of the torque up apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotating propulsion machine 12 Casing 22 Cutter head 24 Inner winding blade 30 Torque-up device 32 Pulley block 33 Crane hook 34 Wire drum 36 Moving pulley 38 Constant pulley 40 Joint part 44 1st wire rope 45 2nd wire rope 48 3rd wire rope 50 shaft

Claims (5)

In the propulsion device that propels the casing into the ground without cutting, a torque-up device for temporarily increasing the torque for rotating the casing,
A wire drum detachably attached to a joint at the rear end of the casing extending rearward of the propulsion unit;
A first wire rope wound around the wire drum in the same direction as the rotation direction of the casing;
A second wire rope wound around the wire drum in a direction opposite to the winding direction of the first wire rope;
A fixed pulley around which the second wire rope is wound and fixed to change the direction of the second wire rope;
A free pulley connected to the free end of the first wire rope and the free end of the second wire rope and pulled by a hoisting device;
A torque-up device for use in a casing rotary propulsion device characterized by comprising:   The casing rotation propulsion according to claim 1, wherein a third wire rope connecting the free end of the first wire rope and the free end of the second wire rope is wound around the movable pulley. Torque increase device used for the machine.   In the wire drum, the first wire rope is wound clockwise from the center of the drum cylinder toward the propulsion direction, and the second wire rope is wound left from the center of the drum cylinder toward the propulsion direction. The torque-up device used for the casing rotary propulsion device according to claim 1, wherein the torque-up device is wound 3 to 5 times.   4. The casing rotary propulsion device according to claim 1, wherein a mobile crane is used as the hoisting device, and the fixed pulley is suspended from a hook of the mobile crane. 5. Torque up device.   The torque-up device used for the casing rotary propulsion device according to claim 4, wherein a force for pulling the movable pulley is managed by a load meter of the mobile crane.

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