JPH0465958B2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a device for updating existing pipes such as water pipes and sewer pipes without using the cut-and-cover method, particularly for updating existing pipes buried underground. The present invention also relates to a device for updating existing pipelines by laying new pipes there.

(Prior art) Renewal of aging pipes buried underground is
Generally, the area where the pipe is buried is excavated using the cut-and-cover method to expose the existing pipe, and after removing the existing pipe, a new pipe is sunk in its place, and the excavated trench is backfilled. . However, with this construction method, trenches must be excavated in the areas to be updated, so if those areas are roads, the roads must be temporarily closed to traffic.

As one of the devices for updating liquid pipes such as water pipes and sewage pipes without using the cut-and-cover method, the excavator is moved forward along the existing pipes and the existing pipes are excavated by the excavator. There is a device that installs a new pipe with the same diameter as the existing pipe by pushing it into the excavated area of the existing pipe. However, in this conventional device, fragments of the existing pipe excavated by the excavator and earth and sand around the excavated existing pipe enter the unexcavated existing pipe and flow within the existing pipe.

In order to prevent this, if the sealing means that is advanced together with the excavator is placed inside an existing pipe that has not yet been excavated, if there are irregularities on the inner surface of the existing pipe, the advancement of the sealing means will be hindered by the irregularities.

(Objective of the Invention) The present invention aims to provide an apparatus for renewing an existing pipe in which the advancement of a sealing means for preventing excavated material from flowing inside the existing pipe is not hindered by unevenness on the inner surface of the existing pipe. be.

(Structure of the Invention) The renewal device of the present invention includes a shield type tunnel excavator that is moved along an existing pipe and excavates at least the existing pipe, and a means for discharging the material excavated by the excavator to the rear of the excavator. and connected to the front part of the excavator so that the front part of the excavator can move forward together with the existing pipe, and arranged in the existing pipe to prevent the excavated object from flowing forward in the existing pipe. The apparatus includes a sealing means, and a propulsion means for advancing the newly installed pipe within the excavation site to place the newly installed pipe in the excavation site by the excavator.

The sealing means includes a body connected to the front of the excavator and extending in the axial direction of the existing pipe; a plurality of radially extending guides mounted around the body to cooperate with the body to prevent the excavated material from flowing forward in the existing pipe; and an extending flange-shaped seal member.

(Operations and Effects of the Invention) The excavator excavates the existing pipe while moving along the existing pipe, and the newly constructed pipe is moved forward by the propulsion means within the excavation site by the excavator, thereby placing it within the excavation site. . As a result, there is no need to excavate the area where the existing pipes to be replaced are installed using the cut-and-cover method. Further, the sealing means prevents the excavated material from flowing within the existing pipe by the sealing member coming into contact with the inner surface of the existing pipe.

According to the present invention, since the sealing means has a guide extending in the longitudinal direction of the existing pipe, even if the inner surface of the existing pipe has unevenness, the movement of the sealing means is not hindered by the unevenness.

(Example) Hereinafter, an example of the updating device of the present invention shown in the drawings will be described.

The renewal device 10 shown in FIG. 1 destroys an existing concrete pipe 12 for sewage buried underground from the downstream side, and lays a new concrete pipe 14 having a larger diameter than the existing pipe 12. Used for construction work.

The renewal device 10 includes a shield type tunnel excavator 20 that is advanced from a development shaft 18 constructed in the ground 16 toward an arrival shaft (not shown) constructed on the upstream side thereof, and a shield type tunnel excavator 20 that excavates a new pipe 14. A propulsion mechanism 22 that pushes the excavator 20 into the excavation site by the excavator 20 and advances the excavator 20; A sealing mechanism 24 movably disposed within the existing pipe 12.
and a discharge mechanism 26 for discharging the excavated material to the ground.
and a temporary flow path mechanism 28 that causes the sewage in the existing pipe 12 to flow through the seal mechanism 24 and the excavator 20 to the downstream pipe line 30.

Shield Type Tunnel Excavation Machine The shield type tunnel excavation machine 20 shown in Figs.
Contains 2.

As shown in FIGS. 2 and 3, the first body portion 34 includes a first cylindrical portion 34a that defines a conical crushing chamber, or a first space 38, whose inner diameter gradually decreases toward the rear. , a second cylindrical portion 34b defining a muddy water chamber, that is, a second space 40, which is continuous to the rear part of the first space 38 and has a cross-sectional area larger than the cross-sectional area of the rear part of the first space. 1st and 2nd
The cylindrical portions 34a and 34b are separably butt-connected to each other by a plurality of bolts at the rear end of the first cylindrical portion 34a and the front end of the second cylindrical portion 34b. The inner diameter of the first space 38 may be approximately the same.

As shown in FIG. 3, grooves extending in the circumferential direction are formed on the outer periphery of the front end and the outer periphery of the rear end of the second cylindrical portion 34b. A plurality of bolts for separably connecting the first and second cylindrical portions 34a and 34b are disposed in a flange portion formed on the outer periphery of the front end by the groove in the front end portion of the second cylindrical portion 34b. There is. On the other hand, a flange portion formed on the outer periphery of the rear end portion by the groove in the rear end portion of the second cylindrical portion 34b has a plurality of bolts are placed.

As shown in FIGS. 3 and 4, first and second spaces 3 are provided on the rear end surface of the first cylindrical portion 34a.
An inwardly directed annular lattice 42 is provided which partitions 8, 40. The lattice 42 extends along the rear end surface of the first cylindrical portion 34a, and also allows small excavated objects to be
However, large excavated objects are allowed to move from the first space 38 to the second space 40.
It has a plurality of openings 44 spaced at equal angular intervals around the axis of the shield body 32 to prevent movement into the space 40 of the shield body 32 . The lattice 42 may be attached to the inside of the front end of the second cylindrical portion 34b. The second cylindrical portion 34b is provided with a partition wall 46 that partitions the inside of the shield body 32 into a front region and a rear region.

As shown in FIGS. 3 and 4, a cylindrical sleeve 48 that extends through the partition wall 46 in the axial direction of the shield body 32 is supported on the partition wall 46 in a non-slip and non-rotatable manner. An internal gear 50 extending around the sleeve 48 is fixed to the first cylindrical portion 34a side of the partition wall 46 with a plurality of bolts. The sleeve 48 has a crankshaft 5 that passes through the sleeve 48 in the axial direction of the shield body 32.
2 is rotatably supported by a plurality of bearings 54. The crankshaft 52 includes a shaft portion 52a supported by the sleeve 48 and an eccentric portion or shaft portion 52b extending forward from the shaft portion. The axis of the shaft portion 52a is aligned with the axis of the shield body 32. In contrast, the axis of the shaft portion 52b is offset by a distance e from the axes of the shield body 32 and the shaft portion 52a, and is located in the first space 38.

As shown in FIG. 3, the shaft portion 52b has a first
A rotor 56, which together with the cylindrical portion 34a constitutes a crusher, is rotatably supported by a plurality of bearings 58. The rotor 56 has a conical shape with an outer surface whose diameter gradually increases toward the rear end, and is disposed within the first space 38 . The rear end outer surface of the rotor 56 and the first cylindrical portion 34a
The distance from the inner surface of the rear end is smaller than the size of the opening 44 of the grid 42 in the diametrical direction of the shield body 32. Note that a plurality of protrusions or grooves extending in the circumferential direction may be provided on the inner surface of the first cylindrical portion 34a defining the first space 38 and on the outer surface of the rotor 56.

As shown in FIGS. 3 and 5, the rotor 56
A cutter assembly 60 is fixed to the tip of the cutter. The cutter assembly 60 includes a plurality of arms 62 extending diagonally forward from the rotor 56 in the radial direction of the shield body 32, and a plurality of cutter bits 64 fixed to the arms 62. Arm 6
Each cutter bit disposed at the most distal end of the cutter assembly 60 has an inward cutting edge directed toward the center of rotation of the cutter assembly 60, and an outward cutting edge directed in the opposite direction. On the other hand, each of the other cutter bits is arranged so that its cutting edge faces toward the center of rotation of the cutter assembly 60, that is, inward, and the cutting edge of the cutter bit is arranged outside of the cutter bit. It is placed further back. Note that each cutter bit may be arranged so that its cutting edge is located on the same plane orthogonal to the rotational axis of the cutter assembly 60.

As shown in FIGS. 3 and 4, the rotor 56
An external gear 66 that meshes with the internal gear 50 is fixed to the rear end surface with a plurality of bolts. The external gear 66 is connected to the crankshaft 5 with respect to the internal gear 50.
The shaft portion 52b is eccentric by a distance e which is the same as the eccentricity of the shaft portion 52b with respect to the shaft portion 52a of No. 2. For this reason,
The gears 50 and 66 mesh with each other at one part in the diametrical direction, and the part where the two mesh with each other is the crankshaft 5.
2 rotates around sleeve 48, resulting in rotor 56 and cutter assembly 60.
rotates (revolutions) around the axis of the seal body 32 and rotates (rotates) around the shaft portion 52b.

As shown in FIG. 3, the rotor 56 and the internal gear 5
0, a mechanical seal 68 is disposed to liquid-tightly close the gap between the two. A mechanical seal 68 is attached to the rear end surface of the rotor 56.
an annular groove 70 provided coaxially with the internal gear 6; a cylindrical ring 72 fitted in the groove and having a substantially uniform outer diameter; The ring 72 is provided with an annular receiving seat 74 that is fixed in position, and a plurality of springs 76 that press the ring 72 toward the receiving seat 74. The groove 70 opens on the internal gear 50 side.

The ring 72 includes an annular main body that is slidably received in the groove 70 in the axial direction of the shield body 32, and a protrusion that extends rearward from the outer periphery of the rear end of the main body coaxially with the main body. The main body portion and the protrusion portion of the ring 72 have the same diameter size and are coaxial with the rotor 56, that is, eccentrically offset from the internal gear 50 by the distance e.
The spring 76 is a compression coil spring, and the groove 7
It is placed in a hole communicating with 0.

The outer diameter dimensions of the main body portion and the protruding portion of the ring 72, especially the rear end surface of the ring 72 and the receiving seat 7.
The diameter of the front end surface of No. 4, that is, the contact surface (sealing surface) between the ring 72 and the receiving seat 74 is at least 2e smaller than the outer diameter dimension of the receiving seat 74. That is, the diameter of the contact surface (sealing surface) between the ring 72 and the receiving seat 74 is determined by setting the diameter of the outer periphery of the rear end surface (protrusion) of the ring 72 as D ₁ and the diameter of the outer periphery of the front end surface of the receiving seat 74. Let D ₂ be D ₁ ≦D ₂ −2e.

As shown in FIG.
The oil chamber 78 has an annular oil chamber 78 surrounding it, and the oil chamber 78 stores lubricating oil. The oil chamber 78 connects the crankshaft 52 and the sleeve 48 through a plurality of holes 80 bored in the partition wall 46, an annular groove 82 formed on the outer periphery of the sleeve 48, and a plurality of holes 84 formed in the sleeve 48. It is connected to the space in between. Therefore, the space between the crankshaft 52 and the sleeve 48 and the space between the partition wall 46 and the sleeve 48 are filled with lubricating oil.

The contact area between the front end of the rotor 56 and the tip of the crankshaft 52, the contact area between the rotor 56 and the ring 72, the contact area between the partition wall 46 and the internal gear 50, and the contact area between the sleeve 48 and the partition wall 46 are , O-rings for sealing are arranged respectively. Further, a sealing material 86 is provided between the rear end of the sleeve 48 and the rear end of the crankshaft 52 to prevent lubricating oil from flowing out.
is located. The sealing material 86 is fixed to the sleeve 48 with a plurality of bolts.

As shown in FIGS. 2 and 3, the second main body portion 36 includes a first cylindrical portion 36a connected to the rear end of the second cylindrical portion 34b, and a first cylindrical portion 36a connected to the rear end of the second cylindrical portion 34b. A second cylindrical portion 36b inserted into the rear end, and a third cylindrical portion 36 connected to the rear end of the second cylindrical portion 36b.
Equipped with c. A support wall 88 is provided at the front end of the first cylindrical portion 36a and is perpendicular to the axis of the shield body 32, and a hole 90 for receiving the rear end of the sleeve 48 is provided in the support wall. The first cylindrical part 36a and the second cylindrical part 36b of the second main body part 36
and are interconnected by a plurality of jacks 92 for direction correction. Connectors 93 and 95 are arranged between the second cylindrical part 36b and the third cylindrical part 36c and between the third cylindrical part 36c and the most recently installed pipe 14.

A drive mechanism 94 for rotating the crankshaft 52 is fixed to the rear part of the support wall 88 with a plurality of bolts. The drive mechanism 94 includes an electric motor and a speed reducer, and an output shaft 96 of the drive mechanism 94 is inserted into a hole provided at the rear end of the crankshaft 52. The output shaft 96 and the crankshaft 52 are connected to the key 98
are non-rotatably connected.

As shown in FIG. 3, the crankshaft 52, the sleeve 48, and the bulkhead 46 include a flow path 10 for guiding the sewage in the existing pipe 12 to the hypothetical flow path mechanism 28.
0, 102, 104 are formed. Channel 10
0 opens at the tip of the crankshaft 52 and at the outer circumference. Channel 102 is connected to sleeve 48 for receiving sewage from channel 100 and directing it to channel 104.
It consists of an annular groove formed on the inner circumferential surface of the flow path 104, and a hole that communicates the groove with the flow path 104. An annular mechanical seal 106 is disposed on both sides of the annular groove between the crankshaft 52 and the sleeve 48 to prevent leakage of sewage from the groove.
A flow path 10 is provided between the sleeve 48 and the partition wall 46.
A pair of O-rings are placed to prevent leakage of sewage from the 2,104 connections.

As shown in FIGS. 3 and 5, the rotor 56
A plurality of vanes 108 are attached to the conical outer surface of the rotor 56 to agitate the excavated material in the first space 38 and give fluidity to the excavated material as the rotor 56 rotates.

Excavator and Propulsion Mechanism for Newly Installed Pipe As shown in FIG.
It includes a slider 112 installed on the top so that it can move along the rail, and a plurality of jacks 114 that move the slider 112 forward. Jyatsuki 114
is attached to a wall 116 constructed within the shaft 18.

The jack 114 is the newly installed pipe 1 at the rear of the preceding
After the new tube is placed between 4 and slider 112, it is extended. As a result, the slider 112
is advanced, the newly installed pipe 14 is pushed into the excavation site by the excavator 20, and the excavator 20 is advanced. When the jack 114 is extended a predetermined distance, the jack 1
14 is retracted, the slider 112 is pulled back,
Next, a new pipe is placed between the slider 112 and the newly installed pipe 14 at the rear, and then the jack 114
is expanded. The replenishment work in which the jack 114 is contracted to pull back the slider 112 and a new pipe is placed between the new pipe at the rear and the slider 112 is buried between the starting shaft and the reaching shaft of the excavator 20. Until the renewal of the existing pipeline is completed,
Performed multiple times.

Sewage Seal Mechanism As shown in FIGS. 7 and 8, the seal mechanism 24 includes a main body 120 that is movable within the existing pipe 12. As shown in FIGS. The main body 120 includes a cylindrical shaft 122 extending along the axis of the existing pipe 12 and a plurality of bearings 1.
24 and a cylindrical frame 126 rotatably disposed around the shaft 122. The shaft 122 is coupled to the rotor 56 of the excavator 20 by a coupling mechanism 128 shown in FIGS. 1 and 9. A pair of mechanical seals 130 are arranged between the shaft 122 and the frame 126, and lubricating oil is contained in the region where the bearing 124 is arranged.

At the tip of the shaft 122, there is a stirring head 13.
2 is fixed. The stirring head 132 includes a boss 134 fixed to the shaft 122 and a boss 13
A plurality of (six in the illustrated example) blades 136 are fixed to four blades. Each blade 136 is attached to the shaft 1
They are arranged at equal angular intervals around the axis of 22 and are interconnected at their distal ends by means such as welding.

A guide head 138 is attached to the distal end of the frame 126 to facilitate smooth movement of the seal mechanism 24 within the existing pipe 12. The guide head 138 includes a boss 140 attached to the frame 126 by a plurality of bolts, and a boss 140 attached to the frame 126 by a plurality of bolts.
A plurality of guides 142 (six in the illustrated example) are fixed at zero. On the outer periphery of the frame 126,
A plurality of plate-shaped guides 144 (six in the illustrated example) are attached. Each guide 142, 144
extend in the axial direction of the shaft 122, and are arranged at equal angular intervals around the axis of the shaft 122. The tips of the guides 142 are interconnected by means such as welding. Guide 14
The tips of 4 are also interconnected by means such as welding.

A tail cover 146 is provided at the rear end of the frame 126.
is attached to the tail cover 146 by a plurality of bolts, and a spacer 150 including a plurality of disc-shaped seal members 148 is attached to the tail cover 146 by a plurality of bolts. The seal member 148 is
Made of elastically deformable rubber-like material.

As shown in FIG. 9, the shaft 122 and the connection mechanism 128 are connected by a flange joint 152. On the other hand, the coupling mechanism 128 and the rotor 56 are coupled by a universal joint 154 so as to allow relative bending of the coupling mechanism 128 and the rotor 56. The universal joint 154 connects the coupling mechanism 12
A pair of receiving seats 158 and 159 are connected to each other by a plurality of bolts so as to rotatably receive the sphere 156, and the sphere 156 is provided in the sphere 1.
56 and a pin 160 that engages the catch 158
and has. A pin 160 passes through the seat 158 and is received in a hole 162 in the sphere 156. Hole 162 has a larger diameter dimension than pin 160. As a result, the sphere 156 and the receiving seat 158 can be bent within a predetermined angular range, but relatively large rotations are prevented. The receiving seat 158 is fixed to the tip of the rotor 56 with a plurality of bolts.

When rotor 56 of excavator 20 is rotated, shaft 122 is rotated relative to frame 126.
As the rotor 56 pivots and the existing pipeline is curved, the sealing mechanism 24 is tilted relative to the excavator 20;
Absorbed by 54.

Hollow part of shaft 122 and coupling mechanism 128
The hollow portions constitute flow paths 164 and 166 that guide the sewage in the existing pipe 12 to the flow path 100 of the bending machine 20.

Excavated material discharge mechanism As shown in FIGS. 1 and 6, the excavated material discharge mechanism 26 discharges muddy water for shear discharge into the second space 4.
0, and a pipe 172 for discharging the excavated material from the second space 40 together with muddy water.
One end of the tube 170 is connected to the support wall 8 by a connector 174.
8, and is connected to the second space 4 through a flow path 178 (see FIG. 3) that is provided so as to penetrate the partition wall 46 in the axial direction of the shield body 32.
It is connected to 0. One end of the tube 172 is also connected to the support wall 88 by a connector 176, as shown in FIG.
It is communicated with the second space 40 via a flow path (not shown) provided so as to penetrate in the axial direction of the second space 40 . The connectors 174 and 176 are fixed to the rear end surface of the support wall 88 with a plurality of bolts (not shown).

As shown in FIG. 1, pipe 170 communicates with water tank 184 via pipe 182, and pipe 172 communicates with settling tank 188 via pipe 186.
A water supply pump 190 and a plurality of valves 1 are connected to the pipe 182.
92 is disposed, and a discharge pump 19 is disposed in the pipe 186.
4 and a plurality of valves 196 are arranged. The tubes 182 and 186 are provided with bendable and expandable tubes in the middle. Pipes 172, 186 for shear discharge
The cross-sectional area of the hollow portion is larger than the area of the opening 44 of the grating 42 . The discharge port of the water supply pump 190 and the suction port of the discharge pump 194 are short-circuited by a short-circuit pipe 198, and a valve 200 is disposed in the short-circuit pipe 198.

As shown in FIG. 3, the bottom of the second space 40 is provided with a flow path that prevents the muddy water supplied from the pipe 170 from directly reaching the pipe 172 and that allows the muddy water to circulate around the second space 40. The partition 20 defines a flow path for muddy water in the second space 40 so that the muddy water flows through the partition 20.
2 is provided.

Pumps 190, 194 are operated when the excavator excavates. Thereby, the discharge mechanism 26 drains the muddy water in the tank 184 into the second space 4 of the excavator 20.
0 via tubes 182, 170 and the second chamber 4
The muddy water in the sedimentation tank 188 is discharged together with the excavated material through pipes 172 and 186. On the other hand, when adding new pipes, pumps 190, 19
4 is stopped and the pipes 182, 186 are passed through the new pipes with the predetermined valves closed, and then the predetermined valves are opened and the pumps 190, 1
94 is activated. A portion of the muddy water supplied to the second chamber 40 flows into the first chamber 38, but most of the muddy water is discharged to the settling tank 188 by the discharge mechanism 26.

Temporary flow path mechanism for sewage As shown in FIGS. 1 to 3, the temporary flow path mechanism 28 includes a first guide 212 including a plurality of pipes interconnected by flange joints 210;
a telescopic and bendable second guide 214 connected to the rear end of the first guide 212; and a discharge pump 2 connected to the rear end of the second guide 214.
16, and a third guide 2 that guides the sewage discharged from the discharge pump 216 to the downstream pipe line 30.
18. The tip of the first guide 212 is
It is connected to the support wall 88 by a connector 220 (see FIG. 3), and is also connected to the flow path 104 of the excavator 20.
is communicated with. The first guide 212 has a valve 222 (see FIG. 2) located within the shield body 32. The third guide 218 also has valve 2.
24 are arranged. The end of the third guide 218 opposite the discharge pump 216 is inserted into the existing pipe 30 with a sealing member 226 disposed at the end.

When the pump 216 is activated, the sewage in the existing pipe 12 flows through the flow path 164 of the sealing mechanism 24, the flow path 166 of the coupling mechanism 128, the flow path 100 of the excavator 20,
102, 104, each guide 212, 214, 21
8 and is forced to flow to the rear pipe line 30. In addition, when adding new pipes, pump 216
is temporarily stopped, valve 222 is temporarily closed, and second guide 214 is passed through the new tube.

Operation of Updating Device 10 During updating work, the drive mechanism 94 of the excavator 20 is operated and the crankshaft 52 is rotated. As a result, the rotor 56 and the cutter assembly 60 are eccentrically e relative to the axis of the shield body 32 and rotate (revolution) around the crankshaft 52 in the same direction as the rotational direction of the crankshaft 52. Since the meshing portion between the external gear 66 fixed to the rotor 56 and the internal gear 50 fixed to the partition wall 46 is sequentially displaced as the rotor 56 rotates, the rotor 56 and the cutter assembly 60 are , and is rotated (rotated) about the shaft portion 52b in a direction opposite to the rotational direction of the crankshaft 52.

Due to the pivoting and rotational movements of the rotor 56 and the cutter assembly 60, the cutter bit 64 not only makes a pivoting and rotational motion with the cutter assembly 60 relative to the shield body 32, but also causes the cutter bit 64 to rotate and move the shield body 32 relative to the shield body 32. The shield main body 32 reciprocates inward toward the center and outward in the opposite direction, that is, in the radial direction of the shield body 32.

A thrust force is applied to the excavator 20 by the propulsion mechanism 22 via the newly installed pipe 14 while the cutter assembly 60 is being turned and rotated as described above. As a result, the new pipe 14 is pushed into the excavated hole, and the excavator 20 is advanced while crushing the existing pipe 12 with the cutter assembly 60 and excavating earth and sand around the existing pipe 12.

Since the cutting edge of each cutter bit 64 faces inward and the cutter bit 64 reciprocates relative to the shield body 32 in the radial direction of the main body 32, the cutter bit 64 has an axis of rotation relative to the shield body 32. When moving in the direction, that is, inward, the existing pipe 12 is destroyed and the earth and sand around the existing pipe 12 is excavated. The existing pipe 12 will be destroyed by the inward force exerted by the cutter bit 64. As a result, the existing pipe 1
Compared to a device that destroys the existing pipe 12 by applying an outward force to the existing pipe 12, that is, a force that pushes the existing pipe 12 apart, the existing pipe 12 is destroyed with a small force. Moreover, since no force that would destroy the existing pipe 12 is applied to the existing pipe 12 when the cutter bit 64 is moved outward, large cracks do not occur in the unbroken existing pipe 12 in its longitudinal direction.

Debris or excavations, including broken existing pipe fragments and excavated earth, are received into the first space 38 . The excavated material received in the first space 38 is agitated by the blades 108 as the rotor 56 rotates, and passes from the first space 38 through the openings 44 of the grid 42 to the second space 4.
Flows to 0. The excavated material flowing into the second space 40 is mixed with the muddy water supplied into the second space 40, and the mixture, that is, the slurry, is sent to the discharge mechanism 26.
is discharged to the settling tank 188.

Large gravels and debris in the excavated material received in the first space 38 are pressed by the rotor 56 against the inner surface defining the first space 38 of the shield body 32 as the rotor 56 pivots and rotates. and is crushed into small pieces large enough to pass through the opening 44. The pieces crushed to a size that can pass through the opening 44 are received into the second space 40 through the opening 44. This prevents gravel and debris from clogging the discharge pipes 172, 186.

The first and second spaces 38, 40 are maintained at a predetermined pressure during the renewal operation so that collapse of the face and heaving of the ground do not occur. As a result, a portion of the excavated material within the first space 38 flows into the existing pipe 12. However, the seal member 14 of the seal mechanism 24
8 is pressed against the inner peripheral surface of the existing pipe 12 by the excavated material flowing into the existing pipe 12, and prevents the excavated material from flowing further forward in the existing pipe 12 from the position of the seal mechanism 24. Seal member 148
Also, the sewage in the existing pipe 12 flows into the first space 38.
Prevent fluid from flowing inward.

The seal mechanism 24 is advanced within the existing pipe 12 as the excavator 20 advances. At this time, since the guides 142 and 144 of the seal mechanism 24 act as a warp, the seal mechanism 24 moves smoothly even if there are irregularities on the inner circumferential surface of the existing pipe 12.

The shaft 122 of the seal mechanism 24 is connected to the excavator 2.
As the rotor 56 rotates, the shaft 12
rotated around two axes. Therefore, the sewage in the newly installed pipe 12 is stirred by the stirring blade 136,
The solid matter in the sewage is crushed by the blades 136,
As a result, the sealing mechanism 24 moves more smoothly and the flow path of the temporary flow path mechanism 28 is not blocked.

Due to the rotational movement and rotational movement of the rotor 56,
The ring 72 of the mechanical seal 68 is the catch seat 74
The ring 72 rotates relative to the receiving seat 74 while being pressed toward the ring 74, but the force that causes the ring 72 to retreat against the force of the spring 76 due to the pressure in the second space 40 does not act on the rear end surface of the ring 72. . That is, even if the ring 72 of the mechanical seal 68 is pressed toward the receiving seat 74 and rotates relative to the receiving seat 74 due to the pivoting and rotational motion of the rotor 56, the outer diameter of the ring 72 remains substantially uniform. , and the diameter of the contact surface (sealing surface) between the ring 72 and the seat 74 satisfies D ₁ ≦D ₂ -2e. Therefore, the entire rear end surface of the ring 72 is always aligned with the front end surface of the seat 74 Therefore, the force caused by the pressure in the second space 40 does not act on the rear end surface of the ring 72. Therefore, liquid tightness between the ring 72 and the receiving seat 74 is maintained.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the updating device of the present invention, Fig. 2 is a cross-sectional view of the shield body of the excavator, showing the excavator and the sealing device, and Fig. 3 is an embodiment of the excavator. Figure 4 is an enlarged cross-sectional view showing 4 in Figure 3.
-A cross-sectional view taken along line 4, Figure 5 is 5 of Figure 2.
6 is an enlarged sectional view taken along line 6-6 in FIG. 2, and FIG. 7 is an enlarged sectional view showing an embodiment of the sealing device. 8 is a left side view of FIG. 7, and FIG. 9 is a sectional view showing one embodiment of the coupling mechanism. 10: Renewal equipment, 12: Existing pipe, 14: New pipe, 16: Ground, 20: Shield type tunnel excavator, 22: Propulsion mechanism for excavator and new pipe, 2
4: Seal mechanism, 26: Excavated material discharge mechanism, 2
8: Temporary sewage channel mechanism, 120: Main body, 12
2: Shaft, 126: Case, 128: Connection mechanism, 132: Stirring head, 136: Stirring blade, 1
38: Guide head, 142, 144: Guide,
148: Seal member.

Claims (1)

[Scope of Claims] 1. A device for renewing an existing pipe by moving an existing pipe buried underground from one end to the other, destroying the existing pipe and laying a new pipe. a shield-type tunnel excavator that is moved along the existing pipe to excavate at least the existing pipe; a means for discharging material excavated by the excavator to the rear of the excavator; a sealing means connected to the front part of the excavator so as to be able to move forward together with the existing pipe and disposed within the existing pipe to prevent the excavated material from flowing forward in the existing pipe; a propulsion means for advancing the newly installed pipe within the excavation site to be placed in the excavation site by an excavator, and the sealing means extends in the axial direction of the existing pipe connected to the front part of the excavator. a body; a plurality of guides mounted angularly spaced about the body and extending axially and radially of the existing pipe; A flange-shaped sealing member that extends continuously in the circumferential direction of the main body and is attached around the main body for prevention together with the main body. 2. The excavator includes a cutter assembly that is rotated around the existing pipe to excavate at least the existing pipe, and the main body extends in the axial direction of the existing pipe, and as the cutter assembly rotates. a shaft connected to the cutter assembly to be rotated; and a cylindrical case rotatably supported by the shaft around an axis of the shaft, the guide and the seal member being attached to the case. An apparatus for renewing an existing pipeline according to claim 1. 3. The existing pipeline renewal device according to claim 2, wherein the sealing means has a stirring blade attached to the tip of the shaft.