JPH08246790A - Propulsion method and equipment for buried pipe in bedrock - Google Patents

Abstract

(57) [Abstract] [Purpose] Leading conduit 3 and buried pipe 2 and tunnel peripheral wall 25
(EN) A propulsion method and a propulsion device for a small-diameter pipe in rock that reduces propulsion resistance of the propulsion device by propelling while flowing a fluid in a space 26 formed by A propelling method for a small-diameter pipe in rock that propels while flowing a fluid toward the front of the tunnel over almost the entire space 26 formed by the front conduit 3 and the buried pipe 2 of the propulsion device and the tunnel peripheral wall 25, And the leading pipe 3 and the buried pipe 2 of the propulsion device which are supplied to the space 26.
A water stop 27 that seals the space 26 and the starting shaft 1 from the supply ports 23 and 29 of the fluid discharged through the interior, or a propulsion device for a small-diameter pipe in rock provided on the outer periphery of the leading conduit 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion method and a propulsion device for a buried pipe in rock for efficiently and reliably burying a buried pipe in a rock mass.

[0002]

2. Description of the Related Art As a first prior art, "Japanese Patent Laid-Open No. 5-106392", which discloses "technology relating to a propulsive force reducing device for burying a buried pipe in a rock mass," will be described. 4A and AA of FIG.
In the cross section (B), a cutter 55 is installed at the front end of the lock semi shield machine.
A chamber 54 for taking in the cut rock cutting powder is formed in the rear portion of No. 5. In the chamber 54, a mud feeding pipe 51 is connected from a mud feeding device (not shown) via a mud feeding pipe opening / closing valve 57, and a branched mud feeding pipe 53 branched from the mud feeding pipe 51 passes through an opening / closing valve 58. Then, the pipe extends through the lower portion of the skim plate body 56 of the lock semi-shielding machine to reach the outside of the lock semi-shielding machine.

The operation of the first conventional technique will be described.
Move to the bedrock part 60 to excavate the rock semi shield machine,
The cutter 55 is brought into contact with the bedrock. Next, the mud transport pipe opening / closing valve 57 is opened, and the mud transport device and the sludge transport device are driven to allow mud water to flow into the mud pipe 51. At the same time, in order to excavate the rock tunnel, the cutter 55 is rotated to cut the rock in front. When a propulsion force is applied to a source pusher (not shown), the propulsion force advances the lock semi-shielding machine through the fume tube. The cut rock cutting powder 61 is taken into the chamber 54 of the lock semi shield machine through an opening (not shown) provided in the cutter 55. The mud water is sent to the rock cutting powder 61 taken into the chamber 54 from the mud sending pipe 51 and stirred. Rock cutting powder mixed in muddy water in this way 6
1 is carried in the sludge discharge pipe 52 together with the muddy water, and is carried to the outside of the tunnel by the sludge carrying device.

In FIG. 5 (A) and FIG. 5 (B) showing a cross section taken along the line B--B, the gap between the lower body 56 of the skim plate of the lock semi-shielding machine and the tunnel excavation surface 59 is gradually compressed. The remaining rock cutting powder 61 increases the frictional resistance of the lock semi-shielding machine, increases the jack pressure of the original pushing device, and prevents the lock semi-shielding machine from advancing. However, in FIGS. 5A and 5B, the mud pipe opening / closing valve 57 and the branch mud pipe opening / closing valve 58 are omitted. In order to prevent this state, before the residual rock cutting powder 61 gradually pressed between the skim plate lower body 56 and the tunnel excavation surface 59 of the lock semi shield machine interferes with the advance of the lock semi shield machine, When the valve 58 for opening and closing the branch mud pipe is opened, it is removed by the pressure of the muddy water sent from the branch mud pipe 53, is agitated and mixed with this muddy water, and is conveyed into the muddy water pipe 52 through the chamber 54 together with the muddy water. Then, it is transported to the outside of the tunnel through the sludge pipe 52. Branch mud pipe 5
3 is in use, the mud pipe opening / closing valve 57 is closed, and the mud pipe 51 does not directly send the water to the chamber 54. In some cases, an operation system that is sent to the mud is adopted.

As a second conventional technique, "Technique for reducing the propulsion resistance of the buried pipe propulsion device by pouring a lubricant from the front conduit of the buried pipe propulsion device" has been disclosed.
5 ”will be described. In FIG. 6, a large number of lubricant ejection holes 72 are provided in the peripheral wall of the pipe body 71 propelled in the ground at intervals in the circumferential direction of the pipe body 71, and the peripheral wall of a casing 73 arranged in the pipe body 71. A large number of lubricant supply holes 74
Are provided at intervals in the circumferential direction of the casing 73. Further, a lubricant supply pipe 75 connected to a lubricant supply device is connected to the peripheral wall of the casing 73, and the lubricant injection holes 72 and the lubricant supply holes 74 are connected via a connection pipe 76. Has been done. A rotary body 78 rotated by a drive device 77 is housed in the casing 73, and the rotary body 78 connects a lubricant receiving chamber 79 in the casing 73 and the lubricant supply hole 74 with a communication passage. A lubricant supply device for an underground propulsion tube provided with 80 is described.

The operation of the second conventional technique will be described.
When the rotating body 78 is rotated by the driving device 77 such as a hydraulic motor, the cutter 86 with the feed blade is passed through the cutter shaft 81.
Rotates, and a tunnel is excavated by the cutter bit mounted on the front surface of the cutter arm 82. The excavated earth and sand excavated by the cutter bit is taken into the excavation and earth removal chamber 87 through the earth removal opening (not shown) installed in the earth stop plate 84, and then, through the earth removal pipe inlet 83 and the earth removal pipe 85. Excavated to the rear. In this manner, the thrust from the rear of the pipe body 71 and the rotation of the cutter 86 with the feed blade allow the pipe body 71 to be embedded while being propelled. In the promotion of the pipe 71,
The lubricant supplied to the lubricant receiving chamber 79 in the casing 73 by the lubricant supply pipe 75 connected to the lubricant supplying device is spaced from each other in the communication passage 80 of the rotor 78 and the circumferential direction of the casing 73. A large number of lubricant supply holes 74 and connecting pipes 7 provided
6, through a large number of lubricant injection holes 72 provided in the peripheral wall of the pipe body 71, between the outer peripheral wall of the pipe body 71 and the ground. Therefore, the friction between the outer peripheral wall of the pipe body 71 and the natural ground is reduced by the lubricant, and the propulsive force of the buried pipe propulsion device is reduced.

[0007]

However, in the first prior art, the object is to remove the rock cutting powder 61 accumulated in the gap between the lower body 56 of the skim plate and the tunnel excavation surface 59 of the lock semi-shielding machine. Since it is the above device, it is not possible to remove the rock cutting powder 61 existing in the gap between the body 56a and the tunnel excavation surface 59 above the middle of the skim plate. Therefore, the rock cutting powder 61 having a large particle size that has entered the void acts like a wedge on the skim plate 56a and the buried pipe between the rock semi-shielding machine and the tunnel excavation surface 59 for propelling the rock semi-shielding machine. This will increase the propulsion frictional resistance of the lock semi shield machine. Therefore, even if the propulsion distance of the lock semi-shielded machine is short, the propulsive force increases and the propulsion becomes impossible, or if the propulsion distance is long, the buried pipe buckles.

In the second prior art, the propulsive force of the buried pipe propulsion device can be reduced by the lubricant poured from the outer diameter of the leading conduit into the space between the outer peripheral wall of the pipe 71 and the ground. If the excavated earth and sand, especially slime, that has entered the space is wedged between the front conduit or the buried pipe and the peripheral wall of the tunnel, it cannot be discharged and the same problem as in the first prior art occurs. The present invention, in view of the problems of the prior art,
The slime that invades between the front conduit or the buried pipe and the peripheral wall of the tunnel is conveyed in the direction of the cutter head by a fluid, and discharged from the inside of the cutter head through the soil discharging device to reduce the propulsive force of the buried pipe propulsion device. By doing so, it is an object of the present invention to solve the problems of the conventional technology such as the buried pipe propulsion device being incapable of propulsion and the buckling accident occurring when the propulsion distance is long.

[0009]

In order to achieve the above object, a propulsion method for a small diameter pipe in rock mass according to the present invention is
In the propulsion method of the buried pipe in the rock for laying the buried pipe in the rock ground, the flow of fluid toward the front of the tunnel is distributed over almost the entire area formed by the front conduit and the buried pipe and the tunnel peripheral wall. Promote while forming. The flow of fluid toward the front of the tunnel is
It is formed by at least one of the fluid supplied from the tunnel starting shaft to the space or the fluid supplied from the outer circumference of the leading conduit.

Further, the propulsion device for the buried pipe in the rock according to the present invention is formed by cutting the ground consisting of the rock, taking in the slime generated by the cutting from the cutter head, and discharging the slime backward by the slime conveying device. In a propulsion device for a buried pipe in rock for propelling a buried pipe in a tunnel, a cutter head is provided through a space formed by the front conduit and the tunnel peripheral wall of the propulsion device, or the front conduit and the buried pipe and the tunnel peripheral wall. A supply port for a fluid to be conveyed backward together with the slime taken in from is provided in at least one of the water stop for sealing the space and the starting shaft and the outer circumference of the leading conduit. At least one of the fluid supply ports may be provided in a lower portion of the tunnel, and the fluid supply port provided on the outer circumference of the leading conduit has a nozzle inclined at a predetermined angle toward the front and outer sides of the propulsion device in the longitudinal section of the propulsion device. , The fluid supply port provided on the outer circumference of the leading conduit may be formed by a nozzle inclined at a predetermined angle with respect to the vertical cross section of the propulsion device, and the fluid provided on the outer circumference of the leading conduit. The supply port may be formed by a nozzle that radially ejects fluid in the circumferential direction of the propulsion device.

[0011]

According to the propulsion method or apparatus for the buried pipe in the rock mass according to the present invention, a water stop or the like for sealing the space formed by at least one of the leading conduit or the buried pipe and the tunnel peripheral wall from the inside of the starting shaft. Through at least one of the fluid supplied to the space from the inside of the tunnel starting shaft or the fluid supplied to the space via the outer circumference of the leading conduit, to the front of the tunnel over almost the entire area of the space. Promote while forming a flowing flow. Therefore, the fluid flowing toward the front of the tunnel in the space efficiently conveys the slime existing in the space toward the front of the tunnel, and from the inside of the propulsion device to the rear of the tunnel together with the slime taken in from the cutter head of the propulsion device. It is transported and discharged to the outside.

Since the slime existing in the space accumulates in the lower portion of the tunnel due to gravity, by providing at least one of the fluid supply ports provided on the outer circumference of the leading conduit in the lower portion of the tunnel, the slime existing in the space is provided. Can be transported more efficiently toward the front of the tunnel.
If the fluid supply port provided on the outer circumference of the leading conduit is formed by a nozzle inclined at a predetermined angle to the front outside of the propulsion device in the longitudinal section of the propulsion device, the slime present in the space is propelled by the fluid ejected from the nozzle. It can be discharged efficiently toward the front of the device. If the fluid supply port provided on the outer circumference of the leading conduit is formed by a nozzle inclined at a predetermined angle with respect to the vertical cross section of the propulsion device, the fluid ejected from the supply port becomes a swirling flow in the space, Slime can be efficiently discharged toward the front of the propulsion device. Further, if the fluid supply port provided on the outer periphery of the leading conduit is formed by a nozzle that radially ejects fluid in the circumferential direction of the propulsion device, even if the nozzles are installed at a predetermined interval on the outer periphery of the propulsion device, almost all of the nozzles are installed. The slime in the space can be efficiently discharged toward the front of the propulsion device over the circumference. Further, the periphery of the supply port for ejecting the fluid, which is provided on the outer periphery of the front conduit, is decompressed because the flow velocity of the fluid ejected from the front conduit is large, so that the fluid in the rear flow is sucked and the flow velocity in the space is increased. There is also the effect of increasing.

[0013]

EXAMPLES Examples of a propulsion method and a propulsion device for a buried pipe in rock according to the present invention will be described in detail below with reference to FIGS. In FIG. 1, a starting shaft 1 and a reaching shaft (not shown) are installed at predetermined intervals in the tunnel construction section, and a propulsion force is applied to the leading conduit 3 by propelling the Hume pipe (buried pipe) 2 into the starting shaft 1. A propulsion jack 4 is installed to do this. The propulsion jack 4 propels the fume tube 2 via the push plate 5, and the tip of the fume tube 2 applies a propulsive force to the tip conduit 3. A screw tube 6 is fixed to the center of the tip conduit 3, and a spherical bearing 7 is supported at the tip of the screw tube 6 and is articulated by an articulating jack 8 and is equipped with a screw shaft 9 having screw blades 9a. A rotating cutter head 10 is rotatably supported by a cutter support 12 by a bearing 11. Cutter head 1
The front part of 0 is a disk cutter (taper) 13 for split rock,
A disk cutter (straight) 13a is mounted so as to be rotatable, and a tool bit 14 is fixed to the outer peripheral portion of the cutter head 10. A hydraulic motor 15 that rotationally drives the screw shaft 9 via a speed reducer 16 is installed in the starting shaft 1.

A filter 20 for filtering the mixed slime 19a discharged from the screw pipe 6 in which the slime 19 excavated from the natural ground 18 and the mud is mixed is installed in the lower part of the starting shaft 1. A muddy water tank 21 for storing filtered muddy water is installed below the filter 20. The muddy water in the muddy water tank 21 is sucked up from the muddy water return pipe 23 by a muddy water pump of ground equipment (not shown) and is circulated to the muddy water supply pipe 22 again. Further, the muddy water discharged to the muddy water supply pipe 22 is
It is supplied into the tail void 26 from a water stop wall 27 that seals the start shaft 1 with the tail void 26 formed by the front conduit 3, the fume pipe 2, and the tunnel peripheral wall 25 via the muddy water supply pipe 22a that branches further. at the same time,
The muddy water supplied from the muddy water supply pipe 22b branched from the muddy water supply pipe 22 is distributed via the distribution valve 28 to the tail void 2 from a predetermined number of nozzles 29 installed on the outer circumference of the leading conduit 3.
It is arranged so as to be ejected into the inside of the pipe 6. This nozzle 2
9 is installed so as to be inclined toward the front outside, but FIG.
It may be installed in the longitudinal section of the propulsion device as shown in (B) which is a view from the direction of arrow V in (A), or with respect to the longitudinal section of the propulsion device as shown in (C). You may incline by a predetermined angle (theta) and install. The reference numeral 31 is a pinch valve, but the description thereof is omitted because it is known.

The operation of the above configuration will be described. When the fume tube 2 is propelled through the push plate 5 by the propulsion jack 4 installed in the starting shaft 1, a propulsive force is applied to the front conduit 3 via the tip of the fume tube 2. Further, when the screw shaft 9 is rotationally driven by the hydraulic motor 15 via the speed reducer 16 and the cutter head 10 is rotated, as shown in FIG.
As shown in (B), the ground 18 made of bedrock is cracked by the crack 32 generated by the pressing and rotation of the disk cutter 13, and the remaining rock is cut by the tool bit 14 to form the tunnel peripheral wall 25. It is formed. The tunnel inner diameter portion other than the tunnel peripheral wall 25 is split and propelled by the disc cutter 13a as shown in FIG. The excavated slime 19 is mixed with the muddy water and taken into the screw pipe 6 from the not-shown inlet of the cutter head 10 as shown by the arrow C, and conveyed to the rear of the tunnel by the screw blade 9a. , Is discharged onto the filter 20 installed in the starting shaft 1. In this way, the desired fume tube 2 can be laid in the natural ground 18 by successively adding the fume tubes 2 together with the excavation of the tunnel by the front conduit 2.

The muddy water supplied from the ground equipment (not shown) through the muddy water supply pipe 22 is the muddy water supply pipe 22.
Muddy water supply pipe 22a that branches further and penetrates the water blocking wall 27
Through the tail void 26. At the same time, the muddy water supplied through the muddy water supply pipe 22 is passed through a muddy water supply pipe 22 b branching from the muddy water supply pipe 22 and a distribution valve 28 from a predetermined number of nozzles 29 installed on the outer circumference of the leading conduit 3. It is supplied into the tail void 26. As described above, the muddy water supplied into the tail void 26 flows through the tail void 26 toward the cutter head 10 and conveys the slime 19 entering the tail void 26 from the cutter head 10 portion toward the cutter head 10 in front of the tunnel. Meanwhile, the slime 19 and the slime 19 are conveyed inside the screw tube 6 to the rear of the tunnel by the screw blades 9a from the slime intake port (not shown) of the cutter head 10. Since the muddy water supplied into the tail void 26 has a larger specific gravity than that of fresh water, the slime 19 in the tail void 26 is given a large buoyancy and can be effectively conveyed toward the front of the tunnel. Of course, is given. The mixed slime 19a obtained by mixing the slime 19 and the muddy water conveyed to the rear of the tunnel is filtered by the filter 20 and only the muddy water returns to the muddy water tank 21, and the muddy water return pipe 23 is used to circulate the mixed slime 19a. It is circulated through the muddy water supply pipe 22. Although muddy water is used in this embodiment, the same effect can be obtained even with a fluid such as fresh water.

As shown in FIG. 3, which is a detailed view of the portion P in FIG. 1, a predetermined number of nozzles 29 are provided on the outer circumference of the leading conduit 3.
Is formed so as to incline at a predetermined angle to the outside of the front of the propulsion device in the vertical cross section of the propulsion device. Therefore, due to the jet of muddy water in the tail void 26 from the nozzle 29 toward the outside of the front of the propulsion device, A muddy water flow indicated by the flow direction B is generated while efficiently applying a force to push the entering slime 19 toward the cutter head 10 in front of the tunnel. In addition, as shown in FIG.
If the nozzle 29 is installed at a predetermined angle θ with respect to the vertical cross section of the propulsion device, the fluid ejected from the supply port becomes a swirling flow in the space, and the slime in the space is directed toward the front of the propulsion device. It can be discharged efficiently. Further, the muddy water supplied into the tail void 26 through the muddy water supply pipe 22a penetrating the water stop wall 27 causes the slime 19 entering the tail void 26 to move toward the cutter head 1 in front of the tunnel.
Rather than applying a force to push in the 0 direction, the nozzle 29
The effect of the mud plug is expected so that the slime 19 that has moved further to the rear does not move further to the rear, but the effect that the mud flow shown in the flow direction A gradually pushes toward the cutter head 10 in front of the tunnel is also expected. It supplies the flow rate that can

Since the slime existing in the tail void 26 is accumulated in the lower portion of the tunnel due to gravity,
A nozzle 29 provided on the outer circumference of the front conduit 3 is provided in a lower portion of the tunnel, or a nozzle inclined at a predetermined angle with respect to a vertical cross section of the propulsion device is used to generate a swirling flow in the tail void 26. If a jet is formed in the nozzle that ejects fluid radially in a direction, and a jet flow toward the cutter head 10 in front of the tunnel is generated over substantially the entire circumference of the tail void 26, the slime 19 present in the tail void 26 will be in front of the tunnel. Can be discharged more effectively toward. Further, the propulsion method and the propulsion device for the buried pipe in the rock mass according to the present invention are not limited to the above-mentioned embodiment, and are applied to the propulsion method and the propulsion device for the buried pipe in all rock mass without departing from the technical idea of the present invention. it can.

[0019]

As described above, the propulsion method and device for a buried pipe in rock according to the present invention have the following effects. (1) By propelling the fluid toward the front of the tunnel while propelling the fluid over the entire circumference of the space formed by the front conduit and the buried pipe and the peripheral wall of the tunnel, the slime is prevented from entering the space and the fluid is transferred. Even if slime remains after flowing forward, the slime in the space is removed forward by the fluid to reduce the frictional resistance between the front conduit and the buried pipe and the tunnel peripheral wall, that is, the propulsion resistance of the propulsion device. Particularly, in the case of a large slime, the buried pipe is prevented from being damaged or buckled due to the wedge action with the peripheral wall of the tunnel, and the downtime of the construction is reduced to improve the propulsion work efficiency of the buried pipe. (2) The fluid flowing toward the front of the tunnel is supplied from the outer circumference of the leading conduit with the fluid supplied from the tunnel start vertical shaft to the space through a water stop or the like which seals the space and the start vertical shaft. If formed with a fluid, slime in the space can be removed more effectively. Further, the periphery of the supply port for ejecting the fluid, which is provided on the outer periphery of the front conduit, is decompressed because the flow velocity of the fluid ejected from the front conduit is large, so that the fluid in the rear flow is sucked and the flow velocity in the space is increased. There is also the effect of increasing. (3) Since the slime existing in the space is accumulated in the lower part of the tunnel due to gravity, by providing the fluid supply port provided on the outer periphery of the leading conduit in the lower part of the tunnel, the slime existing in the space is more surely secured. Can be transported toward the front of the tunnel. (4) The fluid supplied from the outer circumference of the leading conduit is jetted from a nozzle inclined forward or outward by a predetermined angle in the longitudinal cross section of the propulsion device, or inclined by a predetermined angle with respect to the vertical cross section of the propulsion device. If a swirl flow is generated in the space by a nozzle, or a nozzle that radially ejects a fluid in the circumferential direction of the propulsion device is used and the jet flow is directed toward the front of the propulsion device over substantially the entire circumference of the space, then it exists in the space. The slime can be discharged more efficiently toward the front of the propulsion device.
Furthermore, since the jetting force of the fluid is large near the fluid supply port, even if slime remains, it can be pushed forward and discharged. Since the flow velocity of the fluid ejected from the leading conduit is large, the pressure is reduced, so that the fluid in the rear flow is sucked in and the flow velocity in the space is increased. (5) The frictional resistance between the front conduit and the buried pipe and the peripheral wall of the tunnel can be reduced by the buoyancy generated in the front conduit and the buried pipe when the entire circumference of the space is filled with the fluid. (6) Since the fluid flowing toward the front of the tunnel is discharged via the cutter head, there is an additional effect of cooling the cutter and improving durability.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a propulsion device for a buried pipe to which a method for propelling a buried pipe in rock mass according to the present invention is applied.

2A and 2B are views for explaining the operation of FIG. 1, in which FIG. 2A is a front view of FIG. 1 and FIG. 2B is an explanatory view of crushing rock mass by a disc cutter.

3 is an enlarged view of part P in FIG. 1, (A) is an overall view, (B)
FIG. 8A is a view on arrow V in FIG. 7A, and FIG. 9C is a view on arrow V in FIG.

4A and 4B are views showing a first conventional technique, in which FIG. 4A is a vertical sectional view and FIG. 4B is a sectional view taken along line AA of FIG.

5A and 5B are views for explaining FIG. 4, in which FIG. 5A is a vertical sectional view and FIG. 5B is a sectional view taken along line BB in FIG.

6A and 6B are views showing a second conventional technique, in which FIG. 6A is a vertical sectional view and FIG. 6B is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 ... Starting shaft 2 ... Hume pipe (buried pipe) 3 ... Conduit pipe 4 ... Propulsion jack 5 ... Pushing plate 6 ... Screw pipe 7 ... Spherical bearing 8 ... Articulate jack 9 ... Screw shaft 9a ... Screw blade 10 ... Cutter head 11 ... Bearing 12 ... Cutter support 13 ... Disc cutter (taper) 13a ... Disc cutter (straight) 14 ... Tool bit 14 15 ... Hydraulic motor 16 ... Speed reducer 18 ... Ground 19 ... Slime 19a ... Mixed slime 20 ... Filter 21 ... Muddy water tank 22, 22a, 22b ... Muddy water supply pipe 23 ... Muddy water return pipe 25 ... Tunnel peripheral wall 26 ... Tail void (space) 27 ... Water stop wall 28 ... Distribution valve 29 ... Nozzle 31 ... Pinch valve 32 ... Crack.

Claims (7)

[Claims] 1. A method for propelling a buried pipe in rock for laying a buried pipe in a rock mass, wherein the front of the tunnel extends over substantially the entire space formed by the front conduit and the buried pipe and the peripheral wall of the tunnel. A propulsion method for buried pipes in rock, characterized by propelling while forming a flowing fluid flow. 2. The method for propelling a buried pipe in rock according to claim 1, wherein the flow of the fluid toward the front of the tunnel is supplied from the tunnel starting shaft to the space or from the outer circumference of the leading conduit. A propulsion method for a buried pipe in rock, characterized by being formed by at least one of fluids. 3. A rock mass for cutting a rock mass composed of rock mass, taking in a slime generated by the cutting from a cutter head, discharging the slime to the rear by a slime conveying device, and laying a buried pipe in the formed tunnel. In the propulsion device for the buried pipe in, the supply of the fluid conveyed backward together with the slime taken in from the cutter head through the space formed by the front conduit and the tunnel peripheral wall of the propulsion device, or the front conduit and the buried pipe and the tunnel peripheral wall. A propulsion device for a buried pipe in rock, wherein a mouth is provided on at least one of a water stop that seals the space and a starting shaft and an outer circumference of the leading conduit. 4. The propulsion device for a buried pipe in rock according to claim 3, wherein at least one of the fluid supply ports is provided in a lower portion of the tunnel. 5. The propulsion device for a buried pipe in rock according to claim 3, wherein the fluid supply port provided on the outer periphery of the leading conduit is a nozzle inclined at a predetermined angle toward the front and outer sides of the propulsion device in the longitudinal section of the propulsion device. A propulsion device for a buried pipe in rock, characterized by being formed by. 6. The propulsion device for buried pipe in rock according to claim 3 or 5, wherein the fluid supply port provided on the outer periphery of the leading conduit is formed by a nozzle inclined at a predetermined angle with respect to a vertical cross section of the propulsion device. A propulsion device for a buried pipe in rock, characterized by being formed. 7. The propulsion device for a buried pipe in rock according to claim 3 or 5, wherein the fluid supply port provided on the outer periphery of the leading conduit is formed by a nozzle that radially ejects fluid in the circumferential direction of the propulsion device. A propulsion device for a buried pipe in rock, characterized by being formed.