JPH0786310B2 - Shield type tunnel excavator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shield tunnel excavator equipped with a means for cutting a long object such as a tree root, a piece of wood, a wire, or a reinforcing bar.
In particular, the present invention relates to a shield tunnel excavator suitable as a device for renewing existing pipelines such as water supply pipes and sewer pipes without using an excavation method.

(Prior art) A function to cut roots or pieces of wood existing in the soil to be excavated, or long objects such as wires or rebars placed in existing pipes to be renewed to the extent that they do not hinder the discharge thereof. A shield type tunnel excavator equipped with is proposed.

This known shield type tunnel excavator comprises a cylindrical shield main body, partition means for partitioning the interior of the main body into a front region and a rear region, and an extension in the axial direction of the main body in the main body and the partition means. A shaft rotatably supported around an axis extending in the axial direction of the main body, driving means for rotating the shaft, and excavating means supported by a tip portion of the shaft and driven by rotation of the shaft, It includes a discharging means for discharging the excavated material to the outside of the main body, and a cutting means driven by the rotation of the shaft to cut a long object in the excavated material.

The cutting means is disposed inside the main body and is fixed to the main body so as to extend around the axis of the main body, and the cutting means is disposed behind the fixed blade and is fixed with rotation of the shaft. A movable blade connected to the shaft so as to make an eccentric movement with respect to the blade, and a movable blade that cuts the long object in cooperation with the fixed blade.

When the shaft is rotated during excavation, the cutting face or the existing pipe is excavated by the excavation means. Further, the long object in the excavated material enters from the front part of the main body to the front area as the excavator moves forward, and reaches between the fixed blade and the movable blade of the excavation means. The excavating means cuts a long object by the joint action of the fixed blade and the movable blade because the movable blade eccentrically moves with respect to the fixed blade as the shaft rotates.

(Problem to be Solved) However, in the known excavator, a long object may be moved around the axis of the main body with respect to the cutting means by the excavating means as the shaft rotates, and may not be cut.

An object of the present invention is to provide a shield type tunnel excavator equipped with a cutting means capable of reliably cutting a long object.

(Solution Means, Actions and Effects) A shield type tunnel excavator according to the present invention comprises a cylindrical shield body, partition means for partitioning the body into a front region and a rear region, and an axis line of the body inside the body. Direction, and a shaft rotatably supported by the partitioning means around an axis extending in the axial direction of the main body, a drive means for rotating the shaft, and a rotation of the shaft supported by a tip portion of the shaft. And a cutting means that is driven by the rotation of the shaft to cut a long object in the excavated object.

The cutting means used in the present invention is a fixed blade fixed in the main body so as to extend around the axis of the main body, and is arranged in the vicinity of the fixed blade, and is fixed to the fixed blade with the rotation of the shaft. A movable blade that is connected to the shaft so as to perform eccentric movement with respect to the movable blade that cuts the long object in cooperation with the fixed blade, and the fixed blade and the movable blade are adjacent to each other in the front-rear direction. A plurality of protrusions are provided in the main body at intervals around the axis of the main body, and protrude from the inner end surface of the fixed blade toward the axis of the main body.

During excavation, the excavator is advanced while the shaft rotates. As a result, the cutting face is excavated by the excavation means when constructing a new pipeline, and the existing pipe and the surrounding sediment are excavated by the excavating means when the existing pipeline is renewed. The long object in the excavated material enters from the front part of the shield body to the front area as the excavator moves forward, and reaches between the fixed blade and the movable blade of the excavation means. The movable blade moves eccentrically with respect to the fixed blade as the shaft rotates. At this time, the long object engages with the protrusion protruding toward the axis of the shield body from the inner edge of the fixed blade, whereby the long object is displaced around the axis of the shield body with respect to the cutting means. Be blocked from doing.

Therefore, according to the present invention, a plurality of projecting portions projecting toward the axis of the shield body with respect to the inner edge of the fixed blade are adjacent to each other in the front-rear direction of the fixed blade and the movable blade so that Since the movable blade moves eccentrically with respect to the fixed blade because it is arranged around the axis with a space,
The fixed blade is prevented from being displaced around the axis of the shield body with respect to the cutting means by the protrusion, and as a result, the long object is prevented from moving around the axis of the shield body by the protrusion. And the movable blade cooperate to ensure reliable cutting.

Further, with the rotation of the shaft, a motion that causes the excavating means and the movable blade to have a rotational motion about the rotation axis of the shaft and a swivel motion about an axis decentered from the rotation axis of the shaft. Conversion means may be included.

In this case, it is preferable that the motion converting means causes the excavating means and the movable blade to perform 10 to 50 times of the swiveling motion during one time of the rotary motion. Accordingly, the excavating means and the movable blade reciprocate 10 to 50 times in the diametrical direction of the main body during one rotation movement, so that the long object is more reliably cut.

It is preferable that the movable blade is arranged behind the fixed blade so that a part of the movable blade comes into contact with the rear surface of the fixed blade, and the protrusion is arranged in front of the fixed blade. This prevents the long object from moving around the axis of the main body in front of the fixed blade, so that the long object is more reliably cut.

The cutting means may further include a stopper that receives the tip of the elongated object. In this case, it is preferable that the stopper is arranged at a position spaced apart from the movable blade at a position rearward of the movable blade so as to face the contact portions of the both blades and continuously extends around the axis of the main body. As a result, the length of the long object entering the front area is regulated by the stopper, so that the long object is always cut to a predetermined length or less.

As the shaft, a crankshaft having an eccentric portion in the front area can be used. In this case, the excavation means may include a rotor rotatably supported by the eccentric portion, and a cutter assembly fixed to the rotor, and the movable blade may be attached to the rotor. .

Further, a motion conversion that causes the rotor, the cutter assembly, and the movable blade to perform a rotational motion around the rotation axis of the crankshaft and a rotational motion around the axis of the eccentric portion with the rotation of the crankshaft. Means can be included. In this case also, the motion conversion means
It is preferable to cause the excavating means and the movable blade to make 10 to 50 times of the revolving motion during one time of the rotating motion.

The motion converting means is attached to one of the partition wall and the rotor, and is attached to the other of the partition wall and the rotor, partially meshes with the external gear, and is larger than the external gear. And an internal gear. Thereby, the rotor, the cutter assembly and the movable blade are swiveled a plurality of times around the rotation axis of the crankshaft while they are rotated once around the axis of the eccentric portion, and as a result, the main body is rotated. Radial displacement movement of the rotor occurs on the rotor, the cutter assembly and the movable blade.

Therefore, when the movable blade is displaced in the radial direction of the main body with respect to the fixed blade, the long object is cut, so that the long object is more reliably cut. Further, when the rotor is displaced outward in the radial direction of the main body, the solid matter existing in the excavated material in the front region is pressed against the inner surface of the main body by the rotor and is crushed.

The cutter assembly may include a plurality of arms extending radially outward from the rotor and a plurality of cutter bits attached to the arms. In this case, the first
The cutter may be provided at the rear end of each arm, and the main body may be provided with a second cutter that cuts the long object wound around the cutter assembly together with the first cutter. This can prevent a long member such as a wire from being wound around the arm.

Further, it is preferable that a pressing means for pressing the movable blade forward is provided, and the movable blade is pressed against the rear surface of the fixed blade by the pressing means. This makes it possible to more reliably cut the long object.

The fixed blade preferably includes a plurality of blade members sequentially arranged along a virtual circle around the axis of the shield body. It is preferable that the movable blade also includes a plurality of blade members sequentially arranged along a virtual circle around the axis of the shield body. Thus, when the fixed blade or the movable blade is damaged, only the damaged blade needs to be replaced, and the repair work is facilitated.

(Example) Hereinafter, an example of an existing pipeline renewal device using the shield tunnel excavator of the present invention will be described. However, the present invention can be applied not only to the shield type tunnel excavator for updating the pipeline, but also to other shield type tunnel excavators.

Renewal device Referring to FIG. 1, the renewal device 10 for an existing pipe is constructed by crushing an existing concrete pipe 12 for sewage buried underground from the upstream (or downstream) side of the existing pipe. Used for laying a new concrete pipe 14 with a diameter larger than 12.

The renewal device 10 includes a shield tunnel excavator 20 that is advanced from a starting shaft 18 that is built on the ground 16 toward a reaching shaft (not shown) that is built on the upstream side, and a new pipe 14 is excavated. A pushing device 22 for pushing the excavation mark by 20 and advancing the excavator 20 and a fragment of the existing pipe 12 by the excavator 20, preventing excavated material such as excavated earth and sand from reaching the reaching vertical shaft through the existing pipe 12. Thus, the sealing device 24 movably arranged in the existing pipe 12, a connecting device 26 for connecting the excavator 20 and the sealing device 24, a discharging device 28 for discharging the excavated material to the ground, and the existing pipe 12 Equipment for sealing sewage inside 24 and excavator
A bypass device (30) for causing the fluid to flow to the pipeline (32) on the downstream side via (20). The pipeline 32 is an unupdated pipeline in the illustrated example, but may be an updated pipeline.

Shield Type Tunnel Excavator As shown in FIGS. 2 and 3, the shield type tunnel excavator 20 includes a tubular shield body 40. The shield body 40 is divided into first, second, third, fourth and fifth body portions 40a, 40b, 40c, 40d, 40e which are sequentially coupled to each other.

As shown in FIGS. 2 and 3, the first main body portion 40a
Is located at the foremost end and also defines a first space 42 for receiving the excavation. In the illustrated example, the first space
42 has a conical shape whose inner diameter gradually decreases rearward, but the inner diameter may be the same.

As shown in FIGS. 2 and 3, the second main body portion 40b
Defines a second space 44 following the rear of the first space 42 and having a wider cross-sectional area than the first space. The front end portion of the second main body portion 40b is butted against the rear end portion of the first main body portion 40a and is separably connected by a plurality of bolts 46,
The rear end of the second main body 40b is butted against the front end of the third main body 40c and is separably connected by a plurality of bolts 48.

As shown in FIG. 2, the front end portion of the fourth main body portion 40d is slidably inserted in the axial direction of the shield main body 40 at the rear end portion of the third main body portion 40c. Third and fourth body 40
The c and 40d are displaceably connected to each other by a plurality of direction correcting jacks 50 angularly spaced around the axis of the shield body 40.

Each jack 50 is operated by a fluid such as compressed air or hydraulic oil. One of the cylinder and the piston rod of each jack 50 is connected to the third body portion 40c, and the other is connected to the fourth body portion 40d.

As shown in FIG. 2, the front end portion of the fifth main body portion 40e is separably connected to the rear end portion of the fourth main body portion 40d by a plurality of bolts. The rear end of 40e is connected to the front end of the newest pipe 14 by a connecting ring 52. A sleeve 54 is arranged around the abutting portion between the ring 52 and the latest state-of-the-art pipe 14.

As shown in FIGS. 2 and 3, the inside of the shield body 40 is divided into a front region and a rear region by a partition wall 56 provided on the second body portion 40b. The front area comprises first and second spaces 42,44. On the other hand, the rear area is a space formed by the third, fourth and fifth main body portions 40c, 40d and 40e.

The partition wall 56 rotatably supports a crankshaft 58 penetrating the partition wall in the axial direction of the shield body 40 by a plurality of bearings 60. The crankshaft 58 includes a first shaft portion or main body portion 58a supported by the partition wall 56, a second shaft portion or eccentric portion 58b extending forward from the main body portion 58a, and an eccentric portion 58b.
From the sealing device 24 by the connecting device 26
And a third shaft portion, that is, a connecting portion 58c.

The main body portion 58a and the connecting portion 58c have a common axis line 62a that coincides with the axis line of the shield body 40. On the other hand, the eccentric part 58b
Has an axis 62b which is eccentric from the axis 62a by a distance e. The eccentric portion 58b is arranged in the first space 42, and the connecting portion 58c projects further forward from the first space 42.

As shown in FIGS. 2 and 3, the crankshaft 58
The drive mechanism 64 for rotating the is attached to the support wall 66 formed at the front end of the second body 40b so as to be orthogonal to the axis 62a by a plurality of bolts. The drive mechanism 64 includes an electric motor and a speed reducer. The output shaft 68 of the drive mechanism 64 extends to the front of the support wall 66 through a hole formed in the support wall 66, and is inserted into a hole formed at the rear end of the crankshaft 58. The output shaft 68 and the crankshaft 58 are non-rotatably connected by a key 70 shown in FIG.

The rotor 7 that constitutes the crusher together with the first body 40a
2 has a hole penetrating in the axial direction of the rotor 72 to receive the eccentric portion 58b of the crankshaft 58, and is rotatably supported by the eccentric portion 58b by a plurality of bearings 74. The rotor 72 has a conical shape having an outer surface whose diameter gradually increases toward the rear end side, and is arranged in the first space 42. The outer diameter of the rear end of the rotor 72 and the first
The inner diameter of the rear end of the body portion 40a that defines the first space 42 is selected to be a value that forms an appropriate opening therebetween.

As shown in FIGS. 2, 3, and 4, the cutter assembly 76 for excavating the existing pipe 12 and the surrounding sediment is attached to the tip of the rotor 72. Cutter assembly 76
Is a plurality of arms 78 extending from the rotor 72 in the radial direction of the shield body 40, and a ring 80 that connects the tips of the arms 78.
And a plurality of cutter bits 82 fixed to the arm 78 and a plurality of cutter bits 84 fixed to the ring 80.

Each cutter bit 82 is arranged so that its cutting edge is directed toward the center of rotation of the cutter assembly 76, that is, inward, and the cutting edge is more than the cutting edge of the cutting bit arranged outside the cutting bit. It is arranged so that it is behind. On the other hand, each cutter bit 84 is arranged so that its blade edge is directed outward in the radial direction of the shield body 40, that is, outward. Each cutter bit 82 may be arranged so that its cutting edge is located on the same plane orthogonal to the rotation axis of the cutter assembly 76.

A first cutter 86 is attached to the rear portion of each arm 78, and a second cutter 88 is attached to the inner surface of the first main body portion 40a. The first cutter 86 is arranged so that its tooth tips extend in the longitudinal direction of the corresponding arm.
On the other hand, the second cutter 88 is arranged such that its tooth tips face the rotation locus of the first cutter 86.

As shown in FIGS. 2 and 3, the partition wall 56 and the rotor 72 are connected to each other by the motion conversion mechanism 90. As shown in FIG. 3, the motion converting mechanism 90 includes an external gear 94 immovably attached to the outer periphery of the tip of a boss 92 extending from the front end surface of the partition wall 56 into the second space 44, and a rotor 72. The rear end face is provided with an internal gear 96 immovably mounted by a plurality of bolts 98 and a plurality of pins 100.

The outer diameter and pitch circle of the external gear 94 are smaller than the inner diameter and pitch circle of the internal gear 96. The external gear 94 is arranged such that its axis is the same as the axis 62a of the crankshaft 58.

On the other hand, in the internal gear 96, the internal gear 96 is eccentric with respect to the external gear 94 by the same distance e as the eccentric amount of the axis 62b with respect to the axis 62a, and both gears 92, 96 are arranged in The parts are arranged so as to mesh with each other. Therefore, the portion where the gears 94 and 96 mesh with each other moves around the axis 62a as the crankshaft 58 rotates. as a result,
The rotor 72 and the cutter assembly 76 perform a rotational movement (revolution) about the axis 62a and a rotational movement (rotation) about the axis 62b.

In the illustrated example, the difference between the pitch circles of both gears 94 and 96 is small.
Therefore, the rotor 72 and the cutter assembly 76 are
It revolves around the axis 62a several tens of times while rotating once around. As a result, the rotor 72 and the cutter assembly 76 will move along with the rotation of the crankshaft 58.
On the other hand, the rotary motion is performed while reciprocating in the radial direction.

Attach the external gear 94 to the rotor 72 and the internal gear 96 to the boss.
May be attached to 92.

As shown in FIG. 3, between the rotor 72 and the external gear 94, a mechanical seal 102 that liquid-tightly closes them is provided.
Are arranged. The mechanical seal 102 has an annular groove 104 formed coaxially with the external gear 94 on the front end surface of the partition wall 56.
A cylindrical ring 106 fitted in the groove and having a substantially uniform outer diameter; an annular receiving seat 108 fixed to the rear end surface of the internal gear 96 coaxially with the internal gear 96; 106 seat
And a plurality of springs 110 that press toward 108. Groove 104
Opens on the side of the external gear 94.

The ring 106 is arranged so that its axis coincides with the axis 62a, and the receiving seat 108 is arranged so that its axis coincides with the axis 62b. The spring 110 is a compression coil spring, and is arranged in the hole communicating with the groove 104.

As shown in FIGS. 2 and 3, the excavator 20 also
A cutting mechanism 112 for cutting a long object is included. The cutting mechanism 112 is
As shown in FIG. 3 and FIG. 4, the fixed blade 114 mounted inside the first main body portion 40a so as to extend around the axis 62a and the fixed blade 114 so as to partially contact the rear end surface thereof. A movable blade 116 attached to the rear end surface of the rotor 72, a plurality of protrusions 118 in front of the fixed blade 114 and angularly spaced inside the first main body portion 40a, Double-edged blades 114,116 at locations spaced from blade 116 behind
An annular stopper 12 arranged to face the contact part of
With 0 and.

As shown in FIG. 5, the fixed blade 114 is composed of a plurality of plate-shaped blade members 114a. The blade member 144a includes a first body portion 40a so that the blade member 144a forms an annular fixed blade.
Is attached to.

On the other hand, the movable blade 116 is provided with a plurality of blade members 122 arranged around the axis 62b with a space and a plurality of plate-shaped spacers 124 arranged between adjacent blade members. Each blade member 122 has a plate-shaped base 122a,
It has a triangular blade portion 122b protruding outward from the base portion in the radial direction of the shield body 40, and the base portion 122a is separated from the fixed blade 114, but the tip portion of the blade portion 122b is a fixed blade. 1
It is arranged so as to contact the rear end surface of 14.

As shown by the chain double-dashed line in FIG. 5, instead of the spacer 124, the movable blade 116 may be provided with a blade member of the same kind as the blade member 122 at that position.

Each protrusion 118 is provided so as to be at least one for one blade member 114a, and as shown in FIGS.
It projects to the side of the axis line 62a of 0. The stopper 120 is the third
As shown in the figure, it is attached to a plurality of support arms 126 attached to the first main body portion 40a.

As shown in FIG. 3, the partition wall 56 has an annular oil chamber 128 extending around the crankshaft 58, and the oil chamber 128 contains lubricating oil. The oil chamber 128 passes through a plurality of holes 130 formed in the partition wall 56, and passes through the space between the partition wall 56 and the crankshaft 58, the space between the crankshaft 58 and the rotor 72, the crankshaft 58 and the internal gear 96. It is connected to the space between and. Therefore, these spaces are filled with the lubricating oil.

The space between the partition wall 56 and the crankshaft 58 is a cylindrical bearing retainer 132 for a plurality of bearings 60 arranged at the rear end of the crankshaft 58, and a plurality of bolts around the bearing retainer. It is closed by a tubular bearing case 136 attached to the partition wall 56 by 134 and a cap 140 attached to the bearing case by a plurality of bolts 138. In contrast, the crankshaft
The connection device 26 closes the eccentric portion 58b of the rotor 58 and the rotor 72.

The bearing retainer 132 and the bearing case 136 define a space 142 that continuously extends around the bearing retainer 132. The space 142 is connected to a pressure fluid source such as a hydraulic source (not shown) via a port 144 formed in the bearing case 136.

The pressure fluid in the space 142 generates a force that displaces the bearing retainer 132 forward with respect to the shield body 34.
To act on. Therefore, the movable blade 116 receives the force via the crankshaft 58 and the rotor 72, and the fixed blade 116
It is prevented from being pressed by 114 and separated from the fixed blade 114 in the axial direction of the shield body 34. As a result, the long object is more reliably cut.

As shown in FIG. 3, the crankshaft 58 and the partition wall 56.
Have flow paths 146 and 148 for guiding the sewage in the existing pipe 12 to the bypass device 30, respectively. The flow path 146 opens at the tip of the crankshaft 58 and at a plurality of locations on the outer peripheral portion. The bulkhead 56 also receives the sewage from the flow path 146 and guides it through the flow path 148 by the crankshaft 58 of the bulkhead 56.
It has an annular flow path 150 formed on the inner peripheral surface of the receiving portion.

A pair of annular mechanical seals 152 are arranged between the partition wall 56 and the crankshaft 58 so as to prevent leakage of sewage from the flow path 150.

As the rotor 72 rotates, the excavation material in the first space 42 is agitated, and the blades 154 that impart fluidity to the excavation material are attached to the rotor 72.
Can be attached to. A plurality of protrusions or grooves extending in the circumferential direction may be provided on the inner surface of the first main body 40a and the outer surface of the rotor 72 that define the first space 42.

As shown in FIG. 1, the original push device 22 includes a pair of rails 160 installed on the bottom of the vertical shaft 18 so as to extend in the forward direction of the excavator 20, and the rail 160 along the rails. A slider 162 that is movably installed and a plurality of jacks 164 that advance the slider 162 are provided. The jack 164 is attached to a wall 166 constructed within the vertical shaft 18.

The jack 164 consists of the new pipe 14 and the slider 1 at the leading end of the jack 164.
A new tube is placed between 62 and then stretched. As a result, the slider 162 is advanced and the new pipe 14 is moved to the excavator 20.
It is pushed into the excavation mark by and the excavator 20 is advanced. When the jack 164 is extended by a predetermined length, the jack 164 is contracted, the slider 162 is pulled back, a new pipe is arranged between the slider 162 and the new pipe 14 at the rearmost portion, and then the jack 164 is extended. It

The extension work of contracting the jack 164 and pulling back the slider 162, and arranging a new pipe between the new pipe at the rearmost part and the slider 162 is performed on the existing pipe line buried between the starting vertical shaft and the reaching vertical shaft. It is repeated until the update is completed.

Sealing Device As shown in FIGS. 6 and 7, the sealing device 24 includes a shaft member 170 extending in the axial direction of the existing pipe 12 and a main body connected to a tip end of the shaft portion via a connecting member 172. Member 174
And a plurality of elastically deformable (two in the illustrated example) seal members 176 arranged in a flange shape on the main body member.

Each of the shaft member 170, the connecting member 172, and the main body member 174 has a cylindrical portion that defines a flow path 178 for sewage in the existing pipe 12, and a flange portion formed at the front and rear ends thereof for connection. Have. The shaft member 170 and the connecting member 172, and
The connecting member 172 and the main body member 174 are connected at their flanges by a plurality of bolts.

One seal member 176 is attached to the rear end of the main body member 174 by the bolt and the connection member 172 that connect the connection member 172 and the main body member 174. On the other hand, the other seal member 176 is attached to the tip of the main body member 174 by an annular attachment 180 and a plurality of bolts.

A plurality of plate-shaped protrusions 182 are provided on the front end surface of the fixture 180. The body member 174 also has a plurality of ribs 184 connected to both flange portions thereof. The shaft member 170 is connected to the connecting device 26 at its tip end by a flange joint.

Coupling Device As shown in FIG. 3, the coupling device 26 is configured in the form of a universal joint that allows the sealing device 26 and the crankshaft 58 to bend relative to each other. Therefore, the coupling device 26 is
The connecting body 190 has a rear end portion formed in a spherical shape, and a pair of receiving seats 194, 196 mutually connected by a plurality of bolts 192 so as to rotatably receive the spherical portion of the connecting body.

The connecting body 190 is connected to the tip of the shaft member 170 of the seal device 26 by the above-mentioned flange joint at its tip portion, and connects the flow passage 146 of the crankshaft 58 and the flow passage 178 of the seal device 24. It has a flow path 198 to allow it.

When the sealing device 24 is not bent with respect to the crankshaft 58, the coupling device 26 has an axis line of the sealing device 24 which is the axis line 62.
Align the sealing device 24 with the crankshaft 5
Connected to 8. For this reason, the coupling device 26 is also attached to the coupling part 58c of the crankshaft 58 and the axis 6
A collar 200 having an axis coincident with 2a and a sleeve 204 rotatably arranged around the collar 200 by a bearing 202 and having an axis coincident with the axis 62a.

When the sealing device 24 is not bent with respect to the crankshaft 58, the receiving seat 196 has the axis line of the sealing device 24 set to the axis line 62.
Sleeve 20 with multiple bolts 206 to match a
It is attached to 4. As a result, even if the crankshaft 58 is rotated, the sealing device 24 does not move eccentrically with respect to the shield body 40.

Between the collar 200 and the seat 196, the sleeve 204 and the rotor 72
Mechanical seals 208 are respectively arranged between and.

Excavator Discharge Device As shown in FIG. 1, the discharge device 28 includes a supply pipe 210 for supplying muddy water for shear discharge to the second space 44, and a second space 4
4 includes a discharge pipe 212 for discharging excavated material together with muddy water.

As shown in FIGS. 2 and 3, one end of the supply pipe 210 is connected to a connector 214 disposed between the partition wall 56 and the support wall 66, and the connector 214 and the partition wall. It communicates with the lower portion of the second space 44 via a flow path 216 formed in 56.

Similarly, one end of the discharge pipe 212 is also connected to a connector (not shown) arranged between the partition wall 56 and the support wall 66,
Further, the connection tool and a flow path (not shown) formed in the partition wall 56 are shown and communicated with the lower portion of the second space 44.

As shown in FIG. 1, the supply pipe 210 is connected to a water supply tank 220 via a pipe 218, and the discharge pipe 212 is connected to a settling tank 224 via a pipe 222. Water pump in pipe 218
226 and a plurality of valves 228 are connected to each other, and a discharge pump 230 and a plurality of valves 232 are arranged in the pipe 222.

The tubes 210 and 212 are provided with bendable and extendable tubes in the middle thereof. A discharge port of the water supply pump 226 and a suction port of the discharge pump 230 are short-circuited by a short-circuit pipe 234, and a valve 236 is arranged in the short-circuit pipe 234.

As shown in FIG. 3, at the bottom of the second space 44, the muddy water supplied from the supply pipe 210 is prevented from directly reaching the discharge pipe 212, and the muddy water is prevented from reaching the second space 44. A partition 238 that defines a flow path of the muddy water in the second space 44 is provided so as to flow therethrough.

The pumps 226 and 230 are operated during excavation. This allows
The discharge device 28 supplies the muddy water in the tank 220 to the second space 44 of the excavator 20 via the pipes 218 and 210, and discharges the muddy water in the second space 44 together with the excavated product to the settling tank 224 via the pipes 212 and 222. To do.

On the other hand, when adding a new pipe, the pump 226,
With 230 stopped and certain valves closed, pipe 2
After 10,212 is passed through the new pipe, the predetermined valve is opened and the pumps 226,230 are operated. A part of the muddy water supplied to the second space 44 flows into the first space 42, but a large amount of the muddy water is discharged to the settling tank 224 by the discharge device 28.

Detour device As shown in FIGS. 1 to 3, the detour device 30 is connected to a first guide 240 including a plurality of pipes connected to each other by a flange joint and the rear end of the first guide 240. And a bendable second guide 242, a discharge pump 244 connected to the rear end portion of the second guide 242, and sewage discharged from the discharge pump 244 is guided to the pipe line 32 on the downstream side. And a third guide 246 that

As shown in FIG. 3, the tip of the first guide 240 has a partition wall 5
The flow path through the connector 248 arranged between the support wall 66 and the support wall 66.
It is connected to 148. The first guide 240 is the shield body
A valve 250 is provided at a position within 40. A plurality of valves 238 (see FIG. 1) are also arranged on the third guide 246. The end of the third guide 246 on the side opposite to the discharge pump 230 is inserted into the conduit 32 together with the seal member 252 arranged at the end.

When the pump 244 is operated, the sewage in the existing pipe 12 passes through the flow path 178 of the sealing device 24, the flow path 198 of the connection device 26, the flow paths 146, 150, 148 of the excavator 20, the connection tool 248, and the guides 240, 242, 246, and goes backward. It is forced to flow to the conduit 32 of the. When adding the new pipe, the pump 244 is temporarily stopped, the valve 250 is temporarily closed, and the second guide 242 is passed through the new pipe.

Although not shown, the excavator 20, the pushing device 22, the sealing device 24, the coupling device 26, the discharge device 28 and the detour device 30,
An appropriate sealing material for preventing the leakage of muddy water, sewage and lubricating oil is provided in an appropriate member pipe.

Operation of Updating Device At the time of updating, the drive mechanism 64 of the excavator 20 is operated and the crankshaft 58 is rotated. As a result, the rotor 72, the cutter assembly 76, and the movable blade 116 rotate about the shield body 40 while reciprocating in the radial direction of the shield body 40.
82 and 84 are reciprocated in the radial direction with respect to the shield body 40.

The number of reciprocating motions of the rotor 72, the cutter assembly 76, and the movable blade 116 per one rotation varies depending on the difference in the number of teeth between the internal gear 94 and the external gear 96 forming the motion conversion mechanism 90. Rotor
The number of reciprocating motions of the 72, the cutter assembly 76, and the movable blade 116 is preferably 10 to 50 times per rotation thereof.

A thrust force is applied to the excavator 20 by the former pushing device 22 through the new pipe 14 while the cutter assembly 76 is rotated and rotated. As a result, the new pipe 14 is pushed into the excavated hole, and the excavator 20 is advanced while the cutter assembly 76 destroys the existing pipe 12 and excavates the soil around the existing pipe 12.

Since the cutting edges of the cutter bits 82 attached to the arms 78 are inward and the cutter bits 82 reciprocate in the radial direction of the shield body 40 with respect to the shield body 40, these cutter bits 82 are When the cutter bit moves in the direction of the rotation axis relative to the shield body 40, that is, inward, the existing pipe 12 is destroyed or excavated, the earth and sand around the existing pipe 12 are excavated, and one of the rebars in the existing pipe 12 is excavated. Cut all or part. The existing pipe 12 is destroyed or excavated by the inward force of the cutter bit 82.

Of the reinforcing bars in the existing pipe 12, the main bars extending in the axial direction of the existing pipe 12 are cut short. However, the tape reinforcement extending in the circumferential direction of the existing pipe 12 is cut longer than the main reinforcement because the excavator advances a short distance while the cutter bit reciprocates a plurality of times.

Shreds or excavated material, including broken existing pipe debris and excavated earth and sand, are received in the first space 42. The excavated material in the first space 42 is stirred by the blades 154 as the rotor 72 rotates, and
Flows into the second space 44 from. The excavated material that has flowed into the second space 44 is mixed with the muddy water supplied into the second space 44,
The mixture or slurry is discharged to the sedimentation tank by the discharge device 28.
It is discharged to 224.

Large gravel and debris in the excavated material received in the first space 42 are pressed by the rotor 72 against the inner surface of the first main body portion 40a as the rotor 72 swings and rotates. It is crushed into small pieces that are large enough to pass between the portion 40a and the rotor 72. Therefore, gravel and debris do not get stuck in the discharge pipes 212 and 222.

The first and second spaces 42 and 44 are maintained at a predetermined pressure during which the face is not collapsed and the ground is not raised during the renewal operation. As a result, a part of the excavated material in the first space 38 is
It flows into the existing pipe 12. However, the seal member 176 of the sealing device 24 is pressed against the inner peripheral surface of the existing pipe 12 by the excavated material flowed into the existing pipe 12, and the excavated material further moves forward in the existing pipe 12 from the position of the sealing device 24. To flow to. The seal member 176 also prevents sewage in the existing pipe 12 from flowing into the first space 42. Sealing device 24
Is advanced in the existing pipe 12 as the excavator 20 advances.

The tip of the long object received in the first space 42 is the excavator.
With the advancement of 20, the second space 44 is entered through between the fixed blade 114 and the movable blade 116. However, the movable blade 116 is
Since the fixed blade 114 is caused to move eccentrically with the second eccentric movement, the long object is cut by the joint action of the fixed blade 114 and the movable blade 116.

The long object engages with the protrusion 118 and is prevented from moving around the axis 62a. Therefore, the long object is surely cut.
Further, when the long object is received deep inside the second space 44, the tip of the long object contacts the stopper 120, and the long object is prevented from further entering the deep part of the second space 44. It Therefore, the long member is cut into a piece having a predetermined length or less.

According to the excavator 20, since the arms 78 of the cutter assembly 76 and the cutters 86 and 88 of the first main body portion 40a are provided, even if the long member winds around the arm 78, the long member is not It is cut by the joint action of both cutters 86 and 88. Also, movable blade 1
Since the pressure fluid in the space 142 pushes 16 against the rear surface of the fixed blade 114, the long member is reliably cut.

Instead of discharging the excavated material to the ground, shield the excavated material
It may be discharged around 40. FIG. 8 shows an embodiment of such a shield type tunnel excavator 160.

The excavator 160 is provided with a connector 214, a flow path 216 and a partition 238 associated with the ejector 28, instead of having a plurality of holes 262 communicating with the second space 44 and around the first body 40a. It differs from the excavator 20 described above in that it is not.

Like the excavator 20, the excavator 160 causes the rotor 72 to make an eccentric motion as the crankshaft 58 rotates, so that the internal gear 96 of the motion converting mechanism 90 makes an eccentric motion with respect to the shield body 40. Therefore, the excavated material received in the second space 44 is eccentrically moved to the internal gear 96, particularly the shield body 40.
The radial outward movement pushes the holes 162 around the shield body 40.

When the excavated material in the second space 44 is pushed around the shield body 40, the sediment existing around the shield body 40 is consolidated.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an existing pipeline renewal device using the shield type tunnel excavator of the present invention, and FIG. 2 is a sectional view showing a shield body of the shield type tunnel excavator of the present invention. Fig. 3 is an enlarged sectional view showing a part of the shield tunnel excavator, Fig. 4 is an enlarged sectional view taken along line 4-4 in Fig. 2, and Fig. 5 is Fig. 2 5 is an enlarged sectional view taken along line 5-5 of FIG. 6, and FIG. 6 is an enlarged sectional view of the sealing device,
FIG. 7 is a left side view of FIG. 6, and FIG. 8 is an enlarged sectional view showing a part of another excavator. 10: Renewal device, 12: Existing pipe, 14: New pipe, 16: Ground, 18: Starting shaft, 20,160: Shield type tunnel excavator, 22: Push device, 40: Shield body, 56: Bulkhead, 58: Crank Shaft, 64: Drive mechanism, 72: Rotor, 76: Cutter assembly, 78: Arm, 80: Ring, 82,84: Cutter bit, 86: First cutter, 88: Second cutter, 90: Motion conversion Mechanism, 94: External gear, 96: Internal gear, 112: Cutting mechanism, 114: Fixed blade, 116: Movable blade, 118: Projection, 120: Stopper.

Claims (10)

[Claims] 1. A cylindrical shield main body, partition means for partitioning the interior of the main body into a front region and a rear region, and an interior of the main body extending in the axial direction of the main body, and the partitioning means extending in the axial direction of the main body. A shaft rotatably supported about an axis extending to the shaft, driving means for rotating the shaft, excavating means supported by the tip of the shaft and driven by rotation of the shaft, and rotation of the shaft. A cutting means for driving to cut a long object in the excavated material, wherein the cutting means is a fixed blade fixed in the main body so as to extend around the axis of the main body, and the vicinity of the fixed blade. A movable blade connected to the shaft so as to make an eccentric movement with respect to the fixed blade with rotation of the shaft, the movable blade cutting the long object in cooperation with the fixed blade. , The above Adjacent to the fixed blade and the movable blade in the front-rear direction, disposed on the inner surface of the main body with a space around the axis of the main body, and projecting toward the axis of the main body from the inner edge of the fixed blade. A shield type tunnel excavator having a plurality of protrusions. 2. With the rotation of the shaft, the excavation means and the movable blade are caused to have a rotational movement about an axis of rotation of the shaft and a rotational movement about an axis decentered from the axis of rotation of the shaft. The motion converting means for causing the excavating means and the movable blade to cause the swiveling motion 10 to 50 times during one rotary motion. ) Shield type tunnel excavator. 3. The movable blade is arranged behind the fixed blade so that a part of the movable blade comes into contact with the rear surface of the fixed blade, and the protrusion is arranged in front of the fixed blade. The shield type tunnel excavator according to 1). 4. The cutting means further includes a stopper for receiving a tip of the elongated object, the stopper facing a contact portion of the both blades at a position spaced apart from the movable blade at a rear side thereof. A shield tunnel excavator according to claim 3, wherein the shield tunnel excavator is arranged and extends continuously around an axis of the body. 5. The shaft is a crankshaft having an eccentric portion in the front area, and the excavating means includes a rotor rotatably supported by the eccentric portion and a cutter assembly fixed to the rotor. The shield tunnel excavator according to claim 3, further comprising: the movable blade attached to the rotor. 6. The rotating motion of the rotor, the cutter assembly, and the movable blade about the rotation axis of the crankshaft and the rotation motion of the eccentric portion around the rotation axis of the crankshaft as the crankshaft rotates. 6. The motion conversion means for causing the excavation means and the movable blade to generate 10 to 50 times of the revolving motion during one time of the rotary motion. Shield type tunnel excavator described in. 7. The motion converting means is attached to one of the partition wall and the rotor, and an external gear, which is attached to the other of the partition wall and the rotor and partially meshes with the external gear. The shield type tunnel excavator according to claim 5, comprising an internal gear larger than the external gear. 8. The cutter assembly comprises a plurality of arms extending radially outward from the rotor and a plurality of cutter bits attached to the arms, each arm having a first end at a rear end thereof. The shield tunnel excavator according to claim 5, further comprising a cutter, wherein the main body includes a second cutter that cuts the long object wound around the cutter assembly in cooperation with the first cutter. . 9. The shield tunnel excavator according to claim 2, further comprising pressing means for pushing the movable blade forward. 10. The fixed blade and the movable blade each include a plurality of blade members sequentially arranged along an imaginary circle around an axis of the shield body, according to claim 1. Shield type tunnel excavator.