JP2000045681A - Underground draw gear for drawn material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground draw gear for a drawn material capable of forming a compact arrival shaft space in easy drilling and constructing work, reducing installation costs in easy constructing work, adjusting the stroke of each drawing wire to keep drawing force uniform, preventing cutting of drawing wire due to deviation of tractive force to smoothly and safely draw the drawn material, and reasonably selecting the number of drawing wires corresponding to constructing conditions without being limited by the number of jacks. SOLUTION: This draw gear includes a jack 20 installed on an arrival shaft side 12 and a drawing wire 28 fixed at one end to drawn materials 16, 17. The drawn materials 16, 17 can be drawn to the arrival shaft 12 side via the jack 20. The jack 20 is arranged in parallel to the drawing wire 28 and the jack 20 is installed on an advance shaft side beyond the ends of the drawn materials 16, 17 protruded to the arrival shaft 12 side. A drawing frame 23 capable of contacting the jack 20 and movable is provided in the direction of elongation of the jack 20. The drawing wire 28 is fixed to the drawing frame 23 and adjusting jacks 30, 31 capable of displacing the wire 28 to the axial direction are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention seeks to reduce the space required for reaching shafts, facilitate excavation work, reduce equipment costs and facilitate construction, and adjust the stroke of each pulling wire to equalize the pulling force. The towed body can be smoothly and safely towed by preventing cutting of the towing wire due to biased towing force, and the number of towing wires is not limited by the number of jacks, but is reasonable according to the construction conditions The present invention relates to an underground traction device for a towed object, which can be selected in the following manner.

[0002]

2. Description of the Related Art As a method of crossing under a track such as an underpass, for example, in Japanese Unexamined Patent Publication No. Hei 8-319792, a starting shaft and a reaching shaft are excavated on both sides of a track, and a digging device and a buried underground are installed on the starting side. This is a traction device that carries in the element of the temporary or main body structure, connects a PC steel stranded wire to the tip of the excavator, and connects the element to the rear end of the rig to reach the PC steel stranded wire. It was connected to a jack, and the drilling rig was pulled through the jack to excavate the ground and penetrate and bury the element.

In this conventional construction method, as shown in FIG. 8, a soil retaining 2 and a reaction force receiver 3 are arranged on an end face of a reaching shaft 1, a gantry 4 is installed on the reaction force keeper 3, and excavation is performed on the gantry 4. Blade 6 of device 5
And a center hole type jack 7 was attached to the gantry 4, and the end of the PC steel stranded wire 8 attached to the jack 7 was connected to the tip of the blade 6.

[0004] Therefore, as shown in the drawing, the conventional reaching shaft 1 has at least earth retaining members 2 and reaction force receivers 3, a margin for removing the cutting edge 6, a length of the jack 7 and its stroke, a margin for bending the PC steel strand 8, and the like. In addition to this, there is a problem that it is difficult to secure the construction space, and the excavation of the reaching shaft 1 becomes large, the construction period is prolonged and the construction cost is increased.

In addition, since the center hole type jack 7 is expensive, it increases the equipment cost.
Since the steel stranded wires 8 are in a paired relationship, the number of PC steel stranded wires 8 is limited to the number of jacks 7, and it is difficult to cope with the construction conditions.

[0006]

SUMMARY OF THE INVENTION The present invention solves such a problem, and aims to reduce the space required for reaching shafts and facilitate excavation work, and to reduce equipment costs and facilitate construction work. Adjusting the wire stroke to maintain the traction force evenly, preventing the traction wire from being cut due to the bias of the traction force, allowing the towed object to be pulled smoothly and safely, and the number of traction wires is limited by the number of jacks It is an object of the present invention to provide an underground traction device for a towed object that can be selected rationally according to construction conditions without any need.

[0007]

For this purpose, the invention of claim 1 comprises a jack installed on the reaching shaft side and a towing wire having one end fixed to the towed body, and the towed body is connected via the jack. In the underground traction device of the towed body capable of being pulled to the arrival shaft side, the jack is arranged in parallel with the towing wire, and the jack is protruded to the arrival shaft side from the tip end of the towed body to the starting shaft side. And
A tow frame is provided which is movable in contact with the jack in the extending direction of the jack, and an adjusting jack which fixes the tow wire to the frame and displaces the wire in the axial direction is provided. And to facilitate the excavation work, adjust the stroke of each pulling wire to keep the pulling force uniform, prevent the cutting of the pulling wire due to biased pulling force, and pull the towed body smoothly and safely. Like that.

The invention of claim 2 makes the number of pulling wires different from the number of jacks, eliminates the irrationality that the number of pulling wires is limited by the number of jacks as in the prior art, and reduces the number of pulling wires. Regardless of the number of jacks, it can be selected according to the construction conditions. According to the third aspect of the present invention, the number of the pulling wires is made larger than the number of the jacks to reduce the load on the pulling wires, to prevent the cutting thereof from occurring, and to attach the pulling wires to the towed body with high density. The towed body can be stably and safely towed.

According to a fourth aspect of the present invention, the number of pulling wires is made smaller than the number of jacks, thereby reducing horizontal boring of drilling holes through which the pulling wires are inserted, and reducing labor for mounting the pulling wires. I have to. According to a fifth aspect of the present invention, the traction frame is formed in a substantially straight line so as to simplify the structure and facilitate manufacture. According to a sixth aspect of the present invention, the tow frame is formed in a substantially screen-like manner, and a plurality of adjustment jacks are arranged at predetermined positions of the frame corresponding to the tow body, so that the tow body can be stably and safely towed. I have to.

The invention according to claim 7 is provided with a plurality of jacks,
These jacks are arranged at symmetrical positions of the towing frame to balance the pressing force against the towing frame and to stabilize the movement of the frame. The invention of claim 8 provides a plurality of the adjusting jacks, arranges them so as to be able to extend in the same side direction, and connects a conduit capable of mutually supplying and discharging the working fluid to these jacks to reduce the stroke of each adjusting jack. By adjusting the pulling force evenly, it is possible to prevent one pulling wire from loosening due to the loosening of one pulling wire, etc., to prevent the other pulling wire from being overloaded and cutting, and to prevent the wire from being overloaded and relaxed. The state is automatically canceled, and the towed body can be pulled smoothly and safely.

According to a ninth aspect of the present invention, the jack is of a non-center hole type, the conventional expensive center hole type is eliminated, and the space required for the vertical shaft is reduced, and the equipment cost is reduced. The invention according to claim 10 is that the jack mounting portion for receiving the reaction force for installing the jack is installed behind the tip of the towed body protruding toward the reaching shaft side, and the space for the reaching shaft can be reduced, and the conventional shaft space can be reduced. Such a jack mounting base is abolished to facilitate construction. According to the eleventh aspect of the present invention, the adjustment jack is provided with a wire chuck capable of fixing and releasing the pulling wire, and the pulling wire is dragged by the stroke every full stroke of the jack so that the towed body can be pulled smoothly. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of an embodiment in which the present invention is applied to under-track crossing work. In FIGS. 1 to 7, reference numeral 9 denotes a ground which constitutes a roadbed, and crushed stone, gravel, etc. Is provided.
Rails (not shown) are laid

The starting shaft 11 and the reaching shaft 1 on both sides of the ground 9
The reaching shaft 12 is formed narrower than the starting shaft 11 as shown in the figure, and earth retaining members 13 and 14 such as sheet piles are erected around them.

A reaction force receiver 15 is installed at a predetermined position of an earth retaining member 14 of the reaching shaft 12, and the reaction force receiver 15 is composed of first and second reaction force receivers 15a and 15b framed by an H-section steel. It is superposed and arranged. Among them, the first reaction force receivers 15a are attached to the earth retaining plate 14 with a pair thereof left and right separated from each other, and are mounted on these with the second reaction force receivers 15b also serving as jack stands. Fifteen
a, an excavator 1 constituting a towed body from the inside of 15b
6 and the like can be projected outward.

The excavator 16 includes a screw auger, a drive motor (not shown), and the like, and connects an element 17, which constitutes a towed body, to a temporary or main body structure buried underground in the embodiment. are doing. Reference numeral 18 denotes a cutting edge at the front end of the excavator 16, and 19 denotes a cutter head protruding forward.

Two jacks 20 operable in synchronization with each other are mounted on the second reaction force receiver 15b so as to be separated from each other, and a pair of guide rails 21 are provided immediately below the jacks 20 so as to protrude forward. In the case of the embodiment, the jack 20 is constituted by a normal hydraulic cylinder of a non-center hole type, and its piston rod 22
Can be brought into contact with the symmetrical position of the front traction frame 23.

In the case of the embodiment, the traction frame 23 is formed in a straight beam shape obtained by cutting an H-section steel into a predetermined length,
This is movably extended over the guide rail 21.

In this case, the traction frame 23 is not limited to the beam shape as described above, but may be formed in a plate shape or a screen shape, and by doing so, the contact position of the piston rod 22 and It is possible to secure a wide space for the mounting position of the adjustment jack, which will be described later, and to select the mounting position, to improve the penetration speed or construction speed of the element 17 and to connect the pulling wire, which will be described later, with high density. become.

In the drawing, reference numeral 24 denotes a pair of upper and lower reinforcing frames provided at both ends of the towing frame 23, which frame a plurality of plates in a substantially H-shape and correspond to the contact position of the piston rod 22. And a pair of upper and lower reinforcing plates 25 are disposed between the reinforcing frames 24. Reference numerals 26 denote guide plates projecting downward from both ends of the towing frame 23, and are arranged to be engageable with the upper outer edge of the guide rail 21.

A pair of through holes 2 are formed in the intermediate portion of the towing frame 23.
7 are formed apart from each other, and a pulling wire 28 such as a PC stranded wire is inserted into the hole 27, and the base end of the pulling wire 28 is
Is fixed to a fixing member 29 arranged on the peripheral surface of. The distal end of the pulling wire 28 penetrates through each of the adjusting jacks 30 and 31 and projects forward, and an intermediate portion thereof is connected to the jacks 30 and 31.
Are restrained via a wire chuck 32 provided at the bottom.

The adjusting jacks 30, 31 are constituted by substantially the same hydraulic cylinder, which comprises a cylinder tube,
A piston rod 33 slidably fitted to the tube,
34, and the front and rear ends of each cylinder tube are connected to the conduit 3
The hydraulic fluids are communicated at 5, 36 so that the hydraulic oil can be mutually supplied and discharged.

In this case, according to the present invention, since the pulling wire 28 is not pulled by the jack 20, it is not particularly necessary to set the number of the pulling wires 28 and the number of the jacks 20 to the same number.

Therefore, for example, if the number of the pulling wires 28 is made larger than the number of jacks 20, the pulling wires 28 can be arranged at high density around the cutting edge 18, and the drilling device 16 and the element 17 can be stabilized by their pulling force. And the load on the pulling wire 28 at that time can be reduced.

On the other hand, if the number of the pulling wires 28 is made smaller than the number of jacks 20, for example, the number of the wires 28 can be reduced, and the labor required for attaching the pulling wires 28 to the cutting port 18 can be reduced. Can be towed reasonably and quickly.

In addition, reference numerals 37 and 38 denote a starting stand and a collecting stand installed in the starting shaft 11 and the reaching shaft 12, and 39 denotes a suction pipe which communicates with a suction discharging device 41 through a conduit 40.
This other end communicates with a sediment reservoir (not shown) in the excavator 16 to enable the excavated sediment to be conveyed to the discharge hopper 42 by suction.

When performing under-track crossing work by using the apparatus of the present invention configured as described above, first, the starting shaft 11 and the reaching shaft 12 are excavated on both sides of the ground 9.

In this case, according to the present invention, the jack 20 in the attainment shaft 12 is attached to the second reaction force receiver 15b on the ground 9 side, and the reaction force receiver 15b projects into the attainment shaft 12
6 is located closer to the starting shaft 11 than the tip of the piston 6, and the overall length of the jack 20 and the stroke of the piston rod 22 are
Arranged in parallel with the projecting displacement of the excavator 16 projecting into the arrival shaft 12, and the total displacement of the jack 20 and the cumulative displacement of the stroke of the piston rod 22 are configured to be substantially the same as the projecting displacement of the excavator 16. I have.

Therefore, the cumulative displacement between the entire length of the jack 20 and the stroke of the piston rod 22 is determined by the excavator 1
6, it is not necessary to accumulate the projecting displacements, and the width of the reaching shaft 12 can be narrowed, and the labor for excavating the reaching shaft 12 can be reduced accordingly, as compared with the conventional configuration in which these are arranged in series and accumulated. In addition, the construction period can be shortened and the construction cost can be reduced. Moreover, since the jack 20 employs an inexpensive and small cylinder in place of the conventional long center hole type cylinder, the cumulative displacement is shortened accordingly, and the width of the reaching shaft 12 is promoted.

In this case, the present invention provides the adjusting jacks 30, 3
1 and a new space for the stroke are required. However, since the jacks 30 and 31 are very small and their strokes are short, the space does not increase much.

After the starting shaft 11 and the reaching shaft 12 are excavated in this way, earth retaining members 13 and 14 are stretched in these shafts, and a starting stand 37 is erected on the starting shaft 11.
The excavator 16 and the element 17 are carried into the vessel, and they are connected.

Next, a predetermined position of the ground 9 is drilled by horizontal boring, and the holes are formed by the number of the pulling wires 28, and the pulling wires 28 are penetrated through these drilling holes.
One end of the excavator 16 is connected to the blade 18 of the loaded excavator 16 via a fixture 29, and the other end is protruded from the reaching shaft 12.

Then, a collection stand 38 is erected on the arrival shaft 12, and a pair of first reaction force receivers 15a are attached to the vicinity of the position where the pulling wire 28 is pulled out, separated from each other to the left and right. 15b.

Two jacks 20 are installed on the second reaction force receiver 15b so as to be separated from each other in the left and right direction.
1 and a traction frame 23, and the frame 2
The guide plate 26 protruding from the guide rail 2
Engage with the upper outer edges of 1,21.

As described above, according to the present invention, the second reaction force receiver 15b is provided.
Since the jack 20 is installed in the vehicle and a dedicated frame as in the related art is not required, the construction can be facilitated and the equipment cost can be reduced accordingly. An adjusting jack 30.31 is attached to the front end of the towing frame 23 so as to face the through hole 27.
A pulling wire 28 is inserted into the holes 1 and 31 through the through holes 27, and is placed so as to protrude forward.

In this case, according to the present invention, since the pulling wire 28 is not pulled by the jack 20, it is not particularly necessary to make the number of the pulling wires 28 and the number of the jacks 20 the same.

Therefore, if the number of the pulling wires 28 is made larger than the number of jacks 20, for example, the pulling wires 28 can be arranged at high density around the cutting edge 18, and the drilling device 16 and the element 17 can be stabilized by their pulling force. Thus, the load on the pulling wire 28 can be reduced.

On the other hand, if the number of the pulling wires 28 is smaller than the number of the jacks 20, the number of the wires 28 can be reduced, and the drilling by the horizontal boring and the attachment of the pulling wires 28 to the cutting edge 18 are correspondingly reduced. The time and effort can be reduced, and the excavator 16 and the like can be towed rationally and quickly.

Thereafter, one end of a suction pipe 39 is connected to a sediment reservoir (not shown) in the excavating device 16 on the starting base 37, and the other end is connected to a discharging hopper 42 installed on the ground. And the suction discharging device 41 are connected by a conduit 40.

Under such circumstances, the jack 20 is contracted, the piston rod 22 is retracted, the traction frame 23 is moved to the tip of the rod 22, and these are arranged to be engageable.

When the towing wire 28 is pulled toward the reaching shaft 12 and the bending of the wire 28 between the fixture 29 and the adjusting jacks 30 and 31 is removed as much as possible, the wire chuck 32 is operated. The pulling wire 28 is chucked to maintain a constant tension on the wire 28.

The adjusting jacks 30, 31 have their cylinder tubes filled with pressurized oil, and their pressure balance causes the pistons integrated with the piston rods 33, 34 to be compressed.
Normally, as shown in FIG. 6, the piston rods 33 and 34 are located substantially at the center of the cylinder tube, and the piston rods 33 and 34 protrude by approximately 1/2 stroke.

Thereafter, when the jacks 20, 20 are extended and their piston rods 22 are made to protrude, the tips of the rods 22 come into contact with the towing frame 23 and push the frame 23 forward.

As a result, the towing frame 23 moves forward along the guide rails 21 and 21, and the adjusting jacks 30 and 31 move with it, and the towing wire 28 having one end fixed to the jacks 30 and 31 is moved. The excavator 16 and the element 17 fixed to the other end are pulled in the same direction.

On the other hand, when the excavator 16 is driven to excavate the ground 9 before and after the operation of the jacks 20, 20, the excavator 16 and the element 17 penetrate into the ground 9.

At this time, the pressure balance between the front and rear in each cylinder tube is temporarily lost due to a variation in the load of the jacks 20, 20 or a lack of synchronization or a deflecting movement of the excavator 16, so that one of the pulling wires 28 is disconnected. 6 occurs, and the other pulling wire 28 is connected to the jack 2.
There is a risk that the loads 0 and 20 will be concentrated, causing an overload condition and disconnection.

In such a case, the piston rod 34 is pulled back into the cylinder tube by the pulling wire 28 which is temporarily overloaded, and the pressurized oil in the tube is pushed out to the conduit 36 by the displacement.

Therefore, the above-mentioned pressure oil flows into the cylinder tube of the other adjustment jack 30, and the hydraulic pressure pushes the piston rod 33, and the pull wire 28 is pulled by the rod 33 and becomes tight. This situation is as shown in FIG.

Therefore, the overload state of one pulling wire 28 is eliminated and its disconnection is prevented, and the relaxed state of the other pulling wire 28 is released, thereby recovering the intended function.

Thereafter, the adjusting jacks 30 and 31 automatically adjust the strokes of the piston rods 33 and 34 to equalize the traction forces and to adjust the traction force of the traction wires 2 by the bias of the traction force.
8 is prevented, and the element 17 is smoothly pulled to secure the safety of construction.

In this way, when the piston rod 22 has extended its full stroke, the driving of the excavator 16 is stopped, and the jack 20 is reduced to operate the piston rod 22.
Is reduced, and the traction frame 23 is moved to the tip of the rod 22.

At this time, the pulling wire 28 is pulled toward the reaching shaft 12, that is, the pulling wire 28 is pulled out toward the reaching shaft 12 by the stroke, and the slack between the fixture 29 and the adjusting jacks 30, 31 is removed. By the way, the wire chuck 32 is operated to chuck the pulling wire 28.

Thereafter, the above operation is repeated, and the excavator 16 and the element 17 are penetrated into the ground 9 by connecting the subsequent element 17 to the element 17, and the like.
When the projecting portion 8 has protruded from the reaching shaft 12 by a predetermined amount, the embedding of the element 17 at the position is terminated.

Thereafter, the towing wire 28 is removed from the blade port 18 and pulled out from the towing frame 23 to be collected, the towing frame 23 is removed from the guide rail 21, and the jack 20 is subjected to the first and second reaction force receiving members. 1
5a and 15b are removed together, and they are moved to the next construction position and installed.

[0054]

As described above, according to the first aspect of the present invention, the jack is arranged in parallel with the towing wire, and the jack is installed on the starting shaft side from the tip end of the towed body protruding toward the reaching shaft. Along with the jack, a tow frame is provided which is movable in contact with the jack in a direction in which the jack is extended, and an adjusting jack which fixes the tow wire to the frame and displaces the wire in the axial direction is provided. The space can be made compact and the excavation work can be facilitated, and the stroke of each pulling wire can be adjusted to keep the pulling force even, preventing the pulling wire from being cut off due to biased pulling force, making the towed body smooth and safe. Can be towed.

According to the second aspect of the present invention, the number of pulling wires can be made different from the number of jacks, so that the irrational limitation of the number of pulling wires to the number of jacks as in the prior art is eliminated, and the number of pulling wires is reduced. The number can be selected according to the construction conditions irrespective of the number of jacks. Claim 3
According to the invention, since the number of the pulling wires is larger than the number of the jacks, the load on the pulling wires is reduced, the cutting thereof is prevented beforehand, and the pulling wires are attached to the towed body with high density, and The body can be stably and safely towed.

According to the fourth aspect of the present invention, since the number of pulling wires is smaller than the number of jacks, it is possible to reduce the number of horizontal boring operations for drilling holes through which the pulling wires are inserted and to reduce the labor required for mounting the pulling wires. effective. According to the fifth aspect of the present invention, since the traction frame is formed in a substantially straight line, the configuration can be simplified and the production can be facilitated. According to the invention of claim 6, since the tow frame is formed in a substantially screen-like manner, a plurality of adjustment jacks are arranged at predetermined positions corresponding to the tow body of the tow frame to stably and safely tow the tow body. Can be.

According to a seventh aspect of the present invention, a plurality of jacks are provided,
Because these jacks are located at symmetrical positions on the towing frame, balance the pressing force against the towing frame,
The movement of the frame can be stabilized. According to the invention of claim 8, a plurality of adjusting jacks are provided, these are arranged so as to be extendable in the same side direction, and a conduit capable of mutually supplying and discharging the working fluid is connected to these jacks. By adjusting the pulling force evenly, it is possible to prevent one pulling wire from loosening due to the loosening of one pulling wire, etc., to prevent the other pulling wire from being overloaded and cutting, and to prevent the wire from being overloaded and relaxed. There is an effect that the state is automatically canceled and the towed body can be smoothly and safely towed. According to the ninth aspect of the present invention, since the jack is of the non-center hole type, the expensive center hole type as in the prior art can be eliminated, and the space of the reaching shaft can be reduced and the equipment cost can be reduced.

According to the tenth aspect of the present invention, since the jack attachment portion for receiving the reaction force for installing the jack is provided behind the tip of the towed body protruding toward the reaching shaft, the space for the reaching shaft can be reduced. At the same time, the conventional jack mounting base can be eliminated to facilitate the construction. According to the eleventh aspect of the present invention, since the adjustment jack is provided with a wire chuck capable of fixing and releasing the pulling wire, the pulling wire is dragged by the stroke every full stroke of the jack to smoothly pull the towed object. Can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and shows a penetration state of a towed object.

FIG. 2 is a plan view showing an installation state of a towing device in a reaching shaft applied to the present invention.

FIG. 3 is an enlarged plan view showing a main part of the present invention, showing an extended state of a jack.

FIG. 4 is a front view of a traction frame applied to the present invention.

FIG. 5 is a front view of FIG. 3;

FIG. 6 is a plan view showing an operation state of the adjustment jack applied to the present invention, showing a state before the stroke adjustment of the pulling wire restrained by one of the adjustment jacks is relaxed.

FIG. 7 is a plan view showing an operation state of the adjustment jack applied to the present invention, and shows a stroke adjustment state of the adjustment jack after the pulling wire is relaxed.

FIG. 8 is a plan view showing a conventional example of the present invention, and shows a towing state of a towing device in a reaching shaft.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 start shaft 12 reaching shaft 16 towed object (digging rig) 17 towed object (element) 20 jack 23 tow frame 28 tow wire 30, 31 adjustment jack 32 wire chuck 35, 36 conduit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuo Yamamura 2-3-5 Misaki-cho, Chiyoda-ku, Tokyo Iron Building Construction Co., Ltd. F-term (reference) 2D054 AD37 BA18

Claims (11)

[Claims] 1. A towed body provided with a jack installed on a reaching shaft side and a towing wire having one end fixed to a towed body, wherein the towed body can be pulled to the reaching shaft side via the jack. In the towing device, the jack is arranged in parallel with the towing wire, and the jack is installed on the starting shaft side from the tip end of the towed body protruding toward the reaching shaft side, and the jack is extended in the extending direction of the jack. An underground traction device for a towed body, comprising: a traction frame that is movable in contact with the traction frame; an adjustment jack capable of fixing the traction wire to the frame; and displacing the wire in an axial direction. 2. The underground traction apparatus for a towed object according to claim 1, wherein the number of said traction wires can be made different from the number of said jacks. 3. The underground traction apparatus for a towed object according to claim 2, wherein the number of said traction wires is larger than the number of said jacks. 4. The underground traction apparatus for a towed object according to claim 2, wherein the number of said traction wires is smaller than the number of said jacks. 5. The underground traction apparatus for a towed object according to claim 1, wherein the traction frame is formed in a substantially linear shape. 6. The underground traction apparatus for a towed object according to claim 1, wherein the towed frame is formed in a substantially screen shape, and a plurality of adjustment jacks are arranged at predetermined positions of the frame corresponding to the towed object. 7. The device according to claim 1, wherein a plurality of jacks are provided, and the jacks are arranged at symmetric positions of the towing frame.
7. An underground traction device for a towed object according to claim 5 or claim 6. 8. The towed body according to claim 1, wherein a plurality of the adjusting jacks are provided, the plurality of adjusting jacks are arranged so as to be able to extend in the same side direction, and a conduit capable of mutually supplying and discharging the working fluid is connected to the jacks. Underground traction device. 9. The underground traction device for a towed object according to claim 1, wherein the jack is a non-center hole type. 10. The underground traction apparatus for a towed object according to claim 1, wherein the jack mounting portion for receiving the reaction force for installing the jack is installed rearward of a tip end of the towed object protruding toward the reaching shaft. 11. The underground traction device for a towed object according to claim 1, wherein a wire chuck capable of fixing and releasing a traction wire is provided on the adjustment jack.