JP3719849B2 - Small-diameter propeller tip conduit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a leading pipe of a small-diameter propulsion device in which a buried pipe is laid in the ground and can be pulled back to the start shaft.
[0002]
[Prior art]
Conventionally, when a buried pipe is laid in the ground using a small-diameter propulsion machine, a start shaft and a reach shaft are constructed on a preset laying planned line, and the main shaft installed on the start shaft is used as a reach shaft. Drive the leading conduit toward. A buried pipe is fixed to the rear end portion of the leading pipe, the rear end surface of the buried pipe is pressed by a main pushing device, and the buried pipe is sequentially connected and propelled and laid, and then the leading pipe is recovered from the reaching shaft. It was.
[0003]
In such a small-diameter propulsion machine, the pipe cannot be collected until the leading pipe reaches the reaching shaft, and if the reaching shaft cannot be constructed, the buried pipe cannot be laid, so that Japanese Patent Laid-Open Nos. 7-269284 and 9- No. 144485 proposes a small-diameter propulsion device configured such that the leading conduit can be recovered on the start shaft side through the buried pipe.
[0004]
In the small-diameter propulsion device 100 described in Japanese Patent Application Laid-Open No. 7-269284, as shown in FIG. 6, the crushing bit 101 is held by the holding member 102 and can be swung by the hinge 104 to the outer tube 103. The wedge-shaped slider 106 inserted between the rear end portion of the holding member 102 of the crushing bit 101 and the outer cylinder tube 103 by moving the inner cylinder 105 forward is an inner cylinder tube. 107 is provided at the tip. The crushing bit 101 is supported in a state where the wedge-shaped slider 106 is completely inserted and opened to the outside, and the crushing bit 101 is unsupported by moving the inner cylinder 105 rearward. . The small-diameter propulsion device 100 is configured to be pulled back to the start shaft side with the support of the crushing bit 101 being released. Further, the small-diameter propulsion device 100 is configured such that the entire inner cylinder 105 rotates and the excavated material is taken in from the opening 108 on the front surface.
[0005]
In the small-diameter propulsion device 110 described in Japanese Patent Laid-Open No. 9-144485, an outer peripheral bit 111 is attached to the tip as shown in FIG. 7, and the outer peripheral bit when the cutter head 112 is rotated is used. A plurality of spokes 114 whose length 111 is substantially equal to or larger than the outer diameter of the outer cylinder 113 and that can be bent in the radial direction of the cutter head 112 are arranged. The small-diameter excavator 110 is configured to refract the spoke 114 after excavation to avoid interference with the pipe and pull it back to the start shaft side through the inside of the pipe.
[0006]
[Problems to be solved by the invention]
However, in the small-diameter propulsion device 100 described in Japanese Patent Laid-Open No. 7-269284, because the structure is such that the earth and sand etc., which are divided by the crushing bit 101, are taken in from the opening 108 on the front surface, There is a problem that it cannot be used in water or a striking formation, and the usable formation is limited. Further, the small-diameter propulsion device 100 has a problem in that the direction cannot be corrected because the entire inner cylinder 105 is rotated and cannot be swung. Furthermore, since the excavated earth and sand are directly taken in from the opening 108, there is a problem that it cannot be pulled back into the start shaft when the earth and sand are stored in the inner cylinder.
[0007]
On the other hand, in the small-diameter propulsion device 110 described in Japanese Patent Laid-Open No. 9-144485, the spoke 114 can be refracted, and excavation of earth and sand is performed by the outer peripheral bit 111 attached to the spoke 114. Therefore, there is a problem that it is not suitable for excavation of the reki layer and the structure of the cutter head 112 is very complicated. Further, when the direction is corrected, there is a problem that the spoke 114 is refracted and the direction correction is difficult. Furthermore, there is a problem that once it is pulled back to the start shaft side, it cannot be restored again.
[0008]
The present invention has been made to solve such problems, and can be propelled according to a wide range of soil qualities, from gravel layers and hard soils to soft soils, and through the laid pipes to the start shaft side. An object of the present invention is to provide a leading pipe of a small-diameter propulsion device that can be easily pulled back and can be returned to the original state after being pulled back to the start shaft once.
[0009]
[Means for solving the problems and actions / effects]
  In order to achieve the aforementioned objectives,FirstThe tip conduit of the small-diameter propulsion device according to the invention is
  A small-diameter propulsion machine leading pipe having a barrel portion whose outer diameter is smaller than the inner diameter of the buried pipe, a cutter head rotating with respect to the barrel portion in front of the barrel portion, and a disc cutter in front of the cutter head In
  A rocking shaft that is connected to a disk cutter disposed on the outer periphery of the cutter head via a link mechanism and disposed in the tunnel axis direction;
  Sliding means for sliding the rocking shaft in the longitudinal direction of the tunnel axis;
  When the disk cutter is swung between a position where the outermost excavation diameter is substantially the same as the buried pipe outer diameter and a position smaller than the buried pipe inner diameter by sliding the swing shaft in the front-rear direction. And a support member for swingably supporting the disc cutter with respect to the cutter head.And
  The rocking shaft is a screw shaft for discharging the earth and sand taken into the cutter head to the rear.It is characterized by this.
[0010]
  In the present invention, the rocking shaftAs screw shaftIs moved forward of the tunnel axis by the sliding means, and the disk cutter disposed on the outer periphery of the cutter head is rocked outward in the tunnel radial direction by the link mechanism. Thus, the outermost excavation diameter of the disc cutter is made substantially the same as the buried pipe outer diameter. On the other hand, the disk cutter is rocked inward in the tunnel radial direction by the link mechanism by moving the rocking shaft to the rear of the tunnel axis by the sliding means. Thus, the outermost excavation diameter of the disc cutter is made substantially the same as or smaller than the inner diameter of the buried pipe.
[0011]
  In the present invention, the buried pipe is previously laid by rotating the cutter head in a state where the swing shaft is moved forward, that is, in a state where the outermost excavating diameter of the disc cutter is substantially the same as the outer diameter of the buried pipe. The leading conduit is advanced from the starting shaft constructed on the planned line, and the buried pipe is fixed to the rear end portion of the leading conduit. In this way, the buried pipe is sequentially added to the rear end face of the buried pipe, and the tip pipe is propelled. Next, when the leading conduit is pulled back to the start shaft side, the rocking shaft is pulled back by the sliding means, the disk cutter is rocked inward in the tunnel radial direction by the link mechanism, and the outermost excavation diameter is The entire leading conduit is made smaller than the inner diameter of the buried pipe so as to be substantially the same as or smaller than the inner diameter of the buried pipe. Thereafter, the leading conduit is pulled back to the start shaft side, and is recovered through the buried pipe and into the start shaft.
  Further, in the present invention, the tip conduit collected into the start shaft is placed in the original position through the buried pipe, and the cutter head is rotated by sliding the swing shaft forward to rotate the cutter head. By doing so, the propulsion work can be performed again.
[0012]
  According to the present invention, the propulsion work can be performed with the outermost excavation diameter of the disc cutter being substantially the same as the outer diameter of the buried pipe, so there is no increase in propulsion resistance due to sediment consolidation, and even a hard soil layer such as a gravel layer can be reliably obtained. There is an effect that the laying work of the buried pipe can be performed. Moreover, since only the first conduit can be recovered to the starting shaft through the buried tube, and it is not necessary to construct a reaching shaft, the cost required for laying the buried tube can be greatly reduced.
  Further, according to the present invention, it is possible to collect the leading conduit during the propulsion, and machine maintenance such as disk cutter replacement and obstacle removal work can be performed. Is possible.
  further,According to the present invention, it is not necessary to incorporate a hydraulic jack or the like in the cutter head, and the disc cutter can be swung with a simple structure. Therefore, the propulsion can be carried out without alienating the flow of earth and sand taken into the cutter head. The effect which can improve efficiency is produced. In addition, even in the event of a blockage during propulsion, there is an effect that the inside of the cutter head can be agitated and dealt with by rocking the disk cutter by sliding the rocking shaft back and forth.Also, since the disk cutter is rocked using the screw shaft,Even if the structure becomes simple and the propulsion diameter is small, it is possible to cope.
[0013]
  Next, the leading conduit of the small diameter propulsion device according to the second invention is
  A small-diameter propulsion machine leading pipe having a barrel portion whose outer diameter is smaller than the inner diameter of the buried pipe, a cutter head rotating with respect to the barrel portion in front of the barrel portion, and a disc cutter in front of the cutter head In
  A rocking shaft connected to a disk cutter disposed on the outer periphery of the cutter head via a link mechanism and disposed in the tunnel axis direction;
  Sliding means for sliding the rocking shaft in the longitudinal direction of the tunnel axis;
  When the disk cutter is swung between a position where the outermost excavation diameter is substantially the same as the buried pipe outer diameter and a position smaller than the buried pipe inner diameter by sliding the swing shaft in the front-rear direction. And a support member for swingably supporting the disc cutter with respect to the cutter head,
  The support member is disposed along the inner wall of the cutter head chamber, and a stopper for receiving and supporting the support member has a support member contact surface perpendicular to the propulsion direction.It is characterized by this.
[0014]
  According to the present invention, since the propulsive force received during propulsion work can be received by the thrust transmission surface of the support member, a high load is not applied to the support portion of the support member and the link mechanism of the disc cutter, The effect which can improve reliability is produced.
[0015]
  In addition, the tip conduit of the small-diameter propulsion device according to the third invention is
  A small-diameter propulsion machine leading pipe having a barrel portion whose outer diameter is smaller than the inner diameter of the buried pipe, a cutter head rotating with respect to the barrel portion in front of the barrel portion, and a disc cutter in front of the cutter head In
  A rocking shaft connected to a disk cutter disposed on the outer periphery of the cutter head via a link mechanism and disposed in the tunnel axis direction;
  Sliding means for sliding the rocking shaft in the longitudinal direction of the tunnel axis;
  When the disk cutter is swung between a position where the outermost excavation diameter is substantially the same as the buried pipe outer diameter and a position smaller than the buried pipe inner diameter by sliding the swing shaft in the front-rear direction. And a support member for swingably supporting the disc cutter with respect to the cutter head,
  The swinging shaft and the link mechanism are connected via a joint that allows relative rotation.
[0016]
  According to the present invention, only the movement of the rocking shaft in the front-rear direction is transmitted to the link mechanism, and the disk cutter can be rocked, and the rotation of the cutter head and the rocking shaft are independently driven with a simple structure. It can be.
[0017]
  Furthermore, the leading conduit of the small-diameter propulsion device according to the fourth invention is
  A small-diameter propulsion machine leading pipe having a barrel portion whose outer diameter is smaller than the inner diameter of the buried pipe, a cutter head rotating with respect to the barrel portion in front of the barrel portion, and a disc cutter in front of the cutter head In
  A rocking shaft connected to a disk cutter disposed on the outer periphery of the cutter head via a link mechanism and disposed in the tunnel axis direction;
  Sliding means for sliding the rocking shaft in the longitudinal direction of the tunnel axis;
  When the disk cutter is swung between a position where the outermost excavation diameter is substantially the same as the buried pipe outer diameter and a position smaller than the buried pipe inner diameter by sliding the swing shaft in the front-rear direction. And a support member for swingably supporting the disc cutter with respect to the cutter head,
  The rocking shaft is a screw shaft for discharging the earth and sand taken into the cutter head to the rear;
  The support member is disposed along the chamber inner wall of the cutter head, and a stopper for receiving and supporting the support member has a support member contact surface perpendicular to the propulsion direction;
  The swinging shaft and the link mechanism are connected via a joint that allows relative rotation.
[0018]
  According to the present invention, the effects of the first to third inventions can be obtained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Next, specific embodiments of the small-diameter propulsion device according to the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a longitudinal sectional view of a leading conduit of a small bore propulsion device according to an embodiment of the present invention.
[0021]
In the leading conduit 1 of the small-diameter propulsion device of the present embodiment, a trunk portion 3 having an outer diameter set smaller than the inner diameter of the buried pipe 2 sequentially laid behind is provided. Is divided into a front cylinder 3a and a rear cylinder 3b, and the front cylinder 3a and the rear cylinder 3b are connected to each other by a swinging portion 4 by a swinging jack (not shown). A cutter head 6 having a plurality of disk cutters 5 on the front surface is provided in front of the front barrel 3 in the propulsion direction, and dirt and the like are externally provided between the bulk head 7 at the rear of the cutter head 6 and the disk cutter 5. An intake chamber 8 is provided. The cutter head 6 is rotatably supported with respect to the front cylinder 3a by a cutter head drive unit 6a provided in the front cylinder 3a. The leading pipe 1 has a structure in which a propulsion force is obtained by pressing a rear end surface of the buried pipe 2 sequentially laid backward by a main pushing device (not shown) disposed in a start shaft (not shown). ing. In FIG. 1, the tip conduit 1 of the small-diameter propulsion device is illustrated as being divided into two front and rear parts.
[0022]
A screw shaft (corresponding to a rocking shaft in the present invention) 9 that discharges the earth and sand taken into the chamber 8 is provided inside the trunk portion 3 and the cutter head 6 and at the tunnel central axis, and this screw shaft. The earth removal device 12 which consists of the screw 10 and the casing 11 which protrude from the outer peripheral surface of 9 is provided. The screw shaft 9 is rotatable about its axis by a drive motor 13 attached to the rear end thereof. The earth removing device 12 extends to the rear slightly from the rear trunk 3b, and a vacuum earth removing pipe 12a is attached to the lower rear part of the earth removing device 12, and is conveyed by the screw 10 or the like through the vacuum earth removing pipe 12a. The earth and sand that has been removed is transported further backwards.
[0023]
In this embodiment, of the plurality of disk cutters 5, the support member having a substantially L-shaped cross section so that the outer peripheral side of the disk cutter 5 disposed on the outer peripheral portion of the cutter head 6 is along the inner wall of the cutter head 6. 14 is supported at the tip. Further, the base end portion of the support member 14 is pivotally supported via a pin 16 on a bracket 15 projecting forward from the bulkhead 7. The bulkhead 7 is brought into contact with the back surface of the support member 14 when the outermost excavation diameter of the disk cutter 5 is swung to a position where it is substantially the same as the outer diameter of the buried pipe 2. A stopper 16 for holding the position is attached. Further, the outermost surface of the stopper 16 is engraved with gravel so that the gravel from the tunnel well wall does not enter the back surface of the support member 14 when the support member 14 is not in contact with the stopper 16. A prevention rubber 17 is provided in a protruding manner.
[0024]
On the other hand, a link member 18 is pivotally supported by a pin 18a on the center side of the cutter head 6 of the disk cutter 5. The other end of the link member 18 is centered on the front surface of the cutter head 6 by a pin 18b. The slide case 20 that slides back and forth along the outer periphery of the shaft 19 is pivotally supported by a bracket 21 that protrudes in the radial direction. At the rear end of the slide case 20, the tip of a joint 22 having both spherical ends is incorporated, and the rear end of the joint 22 is incorporated at the tip of the screw shaft 9. Thus, the slide case 20 and the screw shaft 9 are connected, and only the forward and backward movement of the screw shaft 9 is transmitted to the slide case 20, and the rotation of the cutter head 6 and the rotation of the screw shaft 9 can be independently driven. It is a simple structure.
[0025]
In this embodiment, a sliding mechanism (corresponding to the sliding means in the present invention) 23 for pulling back the screw shaft 9 to the rear (starting shaft side) is provided behind the earth removing device 12. As shown in FIG. 2, the sliding mechanism 23 is divided into a front casing 11a and a rear casing 11b at the rear of the casing 11, and the rear casing 11b is fitted into the front casing 11a. It is inserted. The front casing 11a and the rear casing 11b are connected by a hydraulic jack 24 provided on the outer periphery thereof, and the rear casing 11b is slid in the front-rear direction by the expansion and contraction of the hydraulic jack 24. Since the rear end portion of the screw shaft 9 is integrated with the casing 11b, the screw shaft 9 is pulled back to the start shaft side as the hydraulic jack 24 is extended. The front and rear casings 11a and 11b are provided so that torque reaction force receiving pins 25 for guiding the sliding are connected to the side surfaces of the connecting portions.
[0026]
In the present embodiment, the body portion 3 has an outer cylinder 26 and an inner cylinder 27, and the outer cylinder 26 and the inner cylinder 27 are connected to each other at the front and rear ends. The outer periphery of the outer cylinder 26 is covered with a sheath cylinder 2a connected to the tip of the buried pipe 2 via a thrust transmission member 28. The thrust transmission member 28 is provided with a concave groove 28a on the entire circumference. ing. A thrust transmission mechanism 29 is provided at the rear ends of the outer cylinder 26 and the inner cylinder 27.
[0027]
The thrust transmission mechanism 29 is arranged such that two sickle-shaped thrust receiving members 30a and 30b face each other in the vertical direction, as shown in a rear side view (a cross-sectional view taken along the line BB in FIG. 1). Yes. One end of each of the thrust receiving members 30 a and 30 b is rotatably connected by a pin 31, and the other end is connected by a cylinder 32 so as to be freely contacted and separated. The thrust receiving members 30a and 30b are disposed at positions opposed to the groove portions 28a of the thrust transmitting member 28, and the thrust receiving members 30a and 30b rotate around the pin 31 when the cylinder 32 is extended. Then, it is inserted into the groove 28a and connected to the thrust transmission member 28 (solid line in FIG. 3). On the other hand, when the cylinder 32 is contracted, the thrust receiving member 28 is rotated in the reverse direction, and the connection with the thrust transmitting member 28 is released (two-dot chain line in FIG. 3).
[0028]
In the front pipe 1 of the small-diameter propulsion device configured as described above, the screw jack 9 is pressed forward so that the hydraulic jack 24 is contracted, and the joint 22 is attached to the tip of the screw shaft 9. The slide case 20 is pressed forward. The bracket 21 protruding from the slide case 20 swings the disc cutter 5 until the support member 14 comes into contact with the stopper 16 via the link member 18. The thrust transmission mechanism 29 extends the cylinder 32 to connect the thrust receiving members 30 a and 30 b to the groove portion 28 a of the thrust transmission member 28.
[0029]
The cutter head 6 is rotated by a cutter head driving unit 6a provided in the front barrel 3a in a state where the outermost excavating diameter of the disc cutter 5 is substantially the same as that of the buried pipe 2, and the main pusher is rotated. A pressing force is applied to the rear end surface of the buried pipe 2 by the device, and the propulsive force is transmitted to the front conduit 1 through the transmission mechanism 29. In this way, when the tip conduit 1 moves forward, the earth and sand excavated by the disk cutter 5 is taken into the chamber 8, and the screw shaft 9 and the screw 10 are rotated by the drive motor 13 through the earth removing device 12. It is taken into the vacuum discharge pipe 12a and conveyed to the start shaft side. In this way, the leading pipe 1 is advanced, new buried pipes are successively added to the rear end of the buried pipe 2, and propulsion work is performed until the planned length of the buried pipe is reached.
[0030]
When the propulsion operation is finished, the hydraulic jack 24 is extended and the rear casing 11b is slid toward the start shaft with respect to the front casing 11a, whereby the screw shaft 9 fixed to the casing 11b is pulled back. As the screw shaft 9 is pulled back, the slide case 20 is pulled back to the start shaft side.
[0031]
FIG. 4 is a schematic diagram for sequentially explaining the state in which the disk cutter 5 is swung toward the center side of the cutter head 6 (inner side in the tunnel radial direction) by pulling back the slide case 20. As shown in the figure, when the slide case 20 is pulled back, the link member 18 pivotally supported by the pin 18b on the bracket 21 protruding from the slide case 20 is rotated and pulled back to the start shaft side. . By pulling back the link member 18, a force for pulling the disk cutter 5 connected to the link member 18 toward the center side of the cutter head 6 is applied. Thus, the disk cutter 5 swings toward the center of the cutter head 6 with the pin 16 at the base end of the support member 14 as the center, and the outermost drilling diameter is substantially the same as or smaller than the inner diameter of the buried pipe 2. .
[0032]
Next, the cylinder 32 is contracted in the thrust transmission mechanism 29, the thrust receiving members 30a and 30b are detached from the groove 28a of the thrust transmitting member 28, and the connection between the thrust receiving members 30a and 30b and the thrust transmitting member 28 is released. Like that.
[0033]
In this way, the outer diameter of the leading pipe 1 is made smaller than the inner diameter of the buried pipe 2, and the connection with the buried pipe 2 is released and pulled back to the start shaft side, so that the inside of the buried pipe 2 laid behind Passed through and recovered to the start shaft.
[0034]
In the present embodiment, the leading conduit 1 can be recovered to the start shaft side during the propulsion by, for example, machine maintenance such as obstacle removal or disk cutter replacement. As described above, after the leading conduit 1 is recovered to the start shaft side, the obstacle removal, machine maintenance, and the like are performed, and the leading conduit 1 passes through the buried pipe 2 again and is placed at the original position. The Thereafter, the thrust receiving members 30a and 30b are expanded by the cylinder 32, inserted into the groove 28a, and connected to the thrust transmitting member 28.
[0035]
Next, the hydraulic jack 24 of the swing mechanism 23 is contracted to press the screw shaft 9 forward, and the slide case 20 and the bracket 21 projecting from the slide case 20 are moved forward. An overhanging force is applied to the disc cutter 5 through the link member 18 pivotally supported by the outer peripheral side 21 in the radial direction. In this way, the support member 14 that supports the disc cutter 5 is swung until it abuts against the stopper 16, and the outermost excavation diameter of the disc cutter 5 is made substantially the same as the outer diameter of the buried pipe 2. Propulsion is possible again by advancing the cutter head 6 while rotating it.
[0036]
According to the present embodiment, the excavation work can be performed in a state where the outermost excavation diameter of the disc cutter 5 is substantially the same as the outer diameter of the buried pipe 2, so that there is no increase in propulsion resistance due to sediment compaction and hard soil such as a gravel layer or the like. Even in the layer, there is an effect that the buried pipe can be reliably laid. In addition, the leading conduit 1 can be recovered to the start shaft through the buried pipe 2 laid, and it is not necessary to pull back the constructed buried pipe, and further, it is not necessary to construct a reaching shaft, so the cost can be greatly reduced. .
[0037]
In addition, according to the present embodiment, it is possible to collect the leading conduit 1 during the propulsion, and it is possible to perform machine maintenance such as disk cutter replacement and obstacle removal work. Distance propulsion becomes possible. Further, since the body portion is divided and swingable, the direction can be easily corrected.
[0038]
According to the present embodiment, since the structure in the cutter head 6 can be simplified, the propulsion efficiency can be improved without alienating the flow of earth and sand in the cutter head 6.
[0039]
According to the present embodiment, the swing mechanism 23 for swinging the disc cutter 5 is disposed at the rear of the rear barrel 3b with a remote controllable structure, so that maintenance is easy. Also, in the unlikely event of a blockage during propulsion, the screw shaft 9 and the screw 10 can be slid back and forth, or the disk cutter 5 can be swung to agitate the chamber 8 and the earth removal device 12. There is an effect that can be done.
[0040]
In the present embodiment, the disk cutter 5 is oscillated by sliding the screw shaft 9 of the earth removing device 12 in the front-rear direction. It is also possible to provide a swinging shaft (not shown) having a spherical tip coaxially with the tip, and the tip of this swinging shaft may be connected to the slide case. Thus, by sliding the rocking shaft in the front-rear direction, the slide case can be moved in the front-rear direction, and the same effect as described above can be obtained.
[0041]
In this embodiment, the rear cylinder is covered with the outer cylinder and the inner cylinder. However, the present invention is not limited to this, and it is sufficient that the rear cylinder is covered only with the outer cylinder or the inner cylinder.
[0042]
In the front conduit 41 of the small-diameter propulsion apparatus according to another embodiment of the present embodiment, as shown in FIG. A mud pipe 42 and a waste mud pipe 43 are provided, and a shaft 44 having a spherical tip is disposed at the center of the tip conduit 41. The front end of the shaft 44 is connected to the slide case 20, and the rear end is connected to a hydraulic jack 45 that slides the shaft 44 in the front-rear direction. Other configurations are the same as in this embodiment. FIG. 5 shows only the front side of the front barrel 3a of the tip conduit 41 of the small-diameter propulsion machine.
[0043]
In the tip conduit 41 of the small-diameter propulsion device configured as described above, the disk cutter 5 supported by the support member 14 is moved to the uppermost position in a state where the hydraulic jack 45 is extended and the slide case 20 is pressed forward. The outer excavation diameter is swung to a position where it is substantially the same as the outer diameter of the buried pipe 2. In this way, the cutter head 6 is rotated and advanced, and the leading conduit 41 is propelled. The earth and sand taken into the cutter head 6 is transported to the start shaft side through the mud pipe 43 together with the muddy water fed into the cutter head 6 from the mud pipe 42. In this way, the leading pipe 41 is advanced, new buried pipes are successively added to the rear end of the buried pipe 2, and propulsion work is performed until the planned length of the buried pipe is reached.
[0044]
When the propulsion operation is completed, or when the front conduit 41 is recovered to the start shaft during propulsion, the slide case 20 is pulled back by contraction of the hydraulic jack 45, and the disk cutter as described above. 5 is drawn in the radial direction of the center side of the cutter head 6. Thus, with the outermost excavation diameter of the disc cutter 5 being substantially the same as or smaller than the inner diameter of the buried pipe 2, it passes through the buried pipe 2 in which the leading conduit 41 is laid and is recovered to the start shaft side.
[0045]
Further, the leading conduit 41 recovered to the start shaft side is returned to the original position through the buried pipe 2, and the slide jack 20 is pushed forward by extending the hydraulic jack 45 so that the disc cutter 5 is again pushed. The outermost excavation diameter is swung to a position where it is substantially the same as the outer diameter of the buried pipe 2, and the propulsion work can be performed. Thus, the same effect as described above can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a leading conduit 1 of a small bore propulsion device according to an embodiment of the present invention.
FIGS. 2A and 2B are longitudinal sectional views (a) and (b) in plan view for explaining the sliding mechanism of the present embodiment.
FIG. 3 is a cross-sectional view taken along line BB in FIG. 1;
FIG. 4 is a schematic diagram for sequentially explaining the state in which the disk cutter of the present embodiment is swung inward in the tunnel radial direction.
FIG. 5 is a vertical cross-sectional view of a leading conduit of a small-diameter propulsion device according to another embodiment of the present embodiment.
FIG. 6 is a longitudinal sectional view of a leading conduit of a conventional small bore propulsion device.
FIG. 7 is a longitudinal sectional view of a leading conduit of a conventional small bore propulsion device.
[Explanation of symbols]
1,41 Small-diameter propulsion pipe
2 buried pipe
3 trunk
3a Front trunk
3b Rear trunk
4 Oscillating part
5 Disc cutter
6 Cutter head
7 Bulkhead
8 chambers
9 Screw shaft
10 screw
11 Casing
12 Earth removal equipment
12a Vacuum drain pipe
13 Drive motor
14 Support member
15 Bracket
16 Stopper
17 Rubber for preventing grazing
18 Link member
19 Shaft
20 Slide case
21 Bracket
22 Joint
23 Sliding mechanism
24, 45 Hydraulic jack
25 Torque reaction force receiving pin
26 outer cylinder
27 Inner cylinder
28 Thrust transmission member
29 Thrust transmission mechanism
30a, 30b Thrust receiving member
31 pins
42 Mud pipe
43 Drainage pipe
44 Shaft for rocking

Claims (4)

A small-diameter propulsion machine leading pipe having a barrel portion whose outer diameter is smaller than the inner diameter of the buried pipe, a cutter head rotating with respect to the barrel portion in front of the barrel portion, and a disc cutter in front of the cutter head In
A rocking shaft connected to a disk cutter disposed on the outer periphery of the cutter head via a link mechanism and disposed in the tunnel axis direction;
Sliding means for sliding the rocking shaft in the longitudinal direction of the tunnel axis;
When the disk cutter is swung between a position where the outermost excavation diameter is substantially the same as the buried pipe outer diameter and a position smaller than the buried pipe inner diameter by sliding the swing shaft in the front-rear direction. And a support member for swingably supporting the disc cutter with respect to the cutter head ,
The leading conduit of a small-diameter propulsion device, wherein the rocking shaft is a screw shaft for discharging the earth and sand taken into the cutter head to the rear . A small-diameter propulsion machine leading pipe having a barrel portion whose outer diameter is smaller than the inner diameter of the buried pipe, a cutter head rotating with respect to the barrel portion in front of the barrel portion, and a disc cutter in front of the cutter head In
A rocking shaft connected to a disk cutter disposed on the outer periphery of the cutter head via a link mechanism and disposed in the tunnel axis direction;
Sliding means for sliding the rocking shaft in the longitudinal direction of the tunnel axis;
When the disk cutter is swung between a position where the outermost excavation diameter is substantially the same as the buried pipe outer diameter and a position smaller than the buried pipe inner diameter by sliding the swing shaft in the front-rear direction. And a support member for swingably supporting the disc cutter with respect to the cutter head,
The small-diameter propulsion device is characterized in that the support member is disposed along an inner wall of the chamber of the cutter head, and a stopper for receiving and supporting the support member has a support member contact surface perpendicular to the propulsion direction. Destination conduit. A small-diameter propulsion machine leading pipe having a barrel portion whose outer diameter is smaller than the inner diameter of the buried pipe, a cutter head rotating with respect to the barrel portion in front of the barrel portion, and a disc cutter in front of the cutter head In
A rocking shaft connected to a disk cutter disposed on the outer periphery of the cutter head via a link mechanism and disposed in the tunnel axis direction;
Sliding means for sliding the rocking shaft in the longitudinal direction of the tunnel axis;
When the disk cutter is swung between a position where the outermost excavation diameter is substantially the same as the buried pipe outer diameter and a position smaller than the buried pipe inner diameter by sliding the swing shaft in the front-rear direction. And a support member for swingably supporting the disc cutter with respect to the cutter head,
A tip conduit of a small-diameter propulsion device, wherein the swing shaft and the link mechanism are connected via a joint that allows relative rotation . A small-diameter propulsion machine leading pipe having a barrel portion whose outer diameter is smaller than the inner diameter of the buried pipe, a cutter head rotating with respect to the barrel portion in front of the barrel portion, and a disc cutter in front of the cutter head In
A rocking shaft that is connected to a disk cutter disposed on the outer periphery of the cutter head via a link mechanism and disposed in the tunnel axis direction;
Sliding means for sliding the rocking shaft in the longitudinal direction of the tunnel axis;
When the disk cutter is swung between a position where the outermost excavation diameter is substantially the same as the buried pipe outer diameter and a position smaller than the buried pipe inner diameter by sliding the rocking shaft in the front-rear direction. And a support member for swingably supporting the disc cutter with respect to the cutter head,
The rocking shaft is a screw shaft that discharges the earth and sand taken into the cutter head to the rear,
The support member is disposed along the chamber inner wall of the cutter head, and a stopper for receiving and supporting the support member has a support member contact surface perpendicular to the propulsion direction;
A tip conduit for a small-diameter propulsion device, wherein the swing shaft and the link mechanism are connected via a joint that allows relative rotation.

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