JP3821658B2 - Shield device for backfilling pipes - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield device for refilling tube refills by crushing and refilling existing tube refills by a shield method.
[0002]
[Prior art]
Conventionally, shield devices for crushing and filling back pipes that have become unnecessary are disclosed in, for example, (1) Japanese Patent Application Laid-Open No. 6-221099 and (2) Japanese Patent Application Laid-Open No. 10-184273.
[0003]
In the conventional example of (1), a ring-shaped cutter head that is fitted around the outer periphery of the existing pipe rod is arranged at the front of the shield main body that is formed to be considerably larger in diameter than the existing pipe rod to be refilled. Is provided with a core removal device that cuts and separates the pipe rod taken from the center hole of the cutter head.
[0004]
Further, the conventional example of (2) includes a gripper device fixed in a stretched state in an existing pipe rod, and a propulsion jack for advancing the shield main body from the gripper device, and a skin plate of the shield main body is predetermined on the existing pipe rod. The skin plate is provided with a jet nozzle for agitating the natural ground at the front end and a sealing material that closes the gap with the pipe rod. It is.
[0005]
[Problems to be solved by the invention]
However, in the conventional configuration of (1), since it is necessary to secure a certain width in the radial direction of the ring-shaped cutter head, the outer diameter of the shield body becomes large, and an extra ground is excavated. In addition, there is a problem that the friction resistance between the existing pipe and the ground and the cutter head is large, and a great amount of excavation power is required.
[0006]
In the conventional example of (2), although the outer skin plate diameter of the shield body can be made sufficiently small, the earth and sand and the backfill material fixed to the outer peripheral surface of the pipe rod are removed by jet water sprayed from the jet nozzle. If the sediment and backfill material consolidated by jet water cannot be removed, the friction resistance between the skin plate, existing pipes, and natural ground may become extremely large, making it difficult to propel the shield body. There was a problem of lack of reliability.
[0007]
The present invention solves the above-mentioned problems, and provides an existing pipe filling back-up shield device that can minimize excavation of extra ground and can excavate and remove the outer periphery of the existing pipe with minimal frictional resistance. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a shield body having a skin plate that is externally fitted to an outer periphery of an end portion of an existing pipe rod, and the skin plate is attached to the existing pipe rod via a seal member. It has a double structure consisting of an inner peripheral plate that is externally fitted to be slidable in the axial direction and an outer peripheral plate that is externally fitted with an accommodation space in the inner peripheral plate. A plurality of excavation bits capable of excavating the outer peripheral portion are arranged, a cutter driving device for driving the excavation bit in the circumferential direction is provided in the shield body, and a driving member for transmitting a driving force to the excavation bit is provided in the accommodating space. A propulsion device that is disposed so as to be freely rotatable in the direction and is capable of being fixed and opened in an existing pipe and propelling the shield main body, and a backfilling device for backfilling the propelled space portion at the rear of the shield main body. Than it is.
[0009]
According to the above configuration, since the drive member that drives the excavation bit is disposed in the housing space of the skin plate having a double structure, the drive member does not come into contact with the existing pipe or the ground, and the friction resistance is reduced. rare. Therefore, the excavation bit can be driven in the circumferential direction with a small driving force, and the driving force of the cutter driving device can be greatly reduced. Even with a double structure, the outer diameter of the skin plate can be reduced by forming the accommodating space small, and the extra excavation part on the outer periphery of the existing pipe can be reduced, and the cost required for excavation Can be reduced.
[0010]
According to a second aspect of the present invention, in the configuration of the first aspect, the cutter driving device is configured to reciprocate the excavation bit by a predetermined angle in the circumferential direction.
According to the above configuration, since the excavation bit is configured to reciprocate in the circumferential direction, a power transmission member (such as a ring gear) that extends over the entire circumference becomes unnecessary, and the assembly and structure of the cutter driving device can be simplified. Can do.
[0011]
Further, the invention according to claim 3 is the configuration according to claim 1 or 2, further comprising a feeding / draining mud apparatus for supplying mud water to the excavation bit and discharging the excavated sediment by the mud, and the accommodation mud apparatus has an accommodation space. In the inside, the gap between the outer peripheral plate and the drive member, or the gap between the inner peripheral plate and the drive member is divided into a plurality in the circumferential direction, and the mud feed passage to which the mud pipe is connected, and the mud to which the mud pipe is connected. A passage is formed.
[0012]
Furthermore, the invention according to claim 4 is the configuration according to claim 1 or 2, further comprising a feeding / draining mud apparatus for supplying mud water to the excavating bit and discharging the excavated earth and sand together with the mud water. Alternatively, mud feeding means and mud discharging means are provided along the drive member.
[0013]
According to each of the above configurations, the mud supplied from the mud supply passage or the mud supply means is washed away by the mud supply / drainage device, and the sand and backfill material excavated by the excavation bit is washed away and recovered from the mud passage or the mud discharge means. Therefore, excavation can be performed easily and efficiently, and the power required for excavation can be reduced.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Here, an embodiment of the existing pipe filling back-up shield device according to the present invention will be described with reference to FIGS.
[0015]
As shown in FIG. 1, the shield device includes a shield body 1 having a skin plate 2 fitted on the outer peripheral portion of an existing pipe rod C, and an outer peripheral portion of the existing pipe rod disposed at the front portion of the skin plate 2. The excavator 3 for excavating the natural ground, the main beam 4 extending forward from the shield body 1 along the direction of the axis O of the existing pipe rod C, and the existing pipe rod C disposed on the main beam 4 A disassembling cutting device 5 for cutting and separating, a disassembling erector device 6 for removing the cut separating tube rod, and a propulsion device 10 for advancing the shield body 1 along the existing tube rod C at the front of the main beam 4; The backfilling device 7 for backfilling the space portion propelled at the rear part of the shield body 1 is provided, and the main beam 4 is supported at the position of the axis O by the front support 8 and the rear support 9 of the shield body 1.
[0016]
As shown in FIGS. 1 and 5, the propulsion device 10 provided at the front portion of the main beam 4 includes a main gripper device 11, a sub gripper device 12, and a traction jack 13, and the main gripper device 11 includes the main beam 4. Three main holding jacks 11b are arranged in a radial direction every 120 degrees from a main support cylinder 11a that is slidably fitted on the main supporting cylinder 11a, and the main pressing plate 11c is respectively attached to the inner surface of the existing pipe rod C by the main holding jack 11b. The main gripper device 11 is configured to be fixed to the existing pipe rod C by pressure contact. Further, the sub gripper device 12 is connected between the main support tube 11a and the sub support tube 12a, which is slidably fitted to the main beam 4 at the rear portion of the main support tube 11a, and is connected to the sub gripper device 12 in the front-rear direction. And a sub-holding jack 12b that is arranged radially at a predetermined angle downward from the sub-supporting cylinder 12a and can press-contact the sub-pressing plate 12c to the inner surface of the existing pipe rod C. Yes. Further, the traction jack 13 is connected between the tip member 4a of the main beam 4 and the main support cylinder 11a.
[0017]
Therefore, the main holding jack 11b is extended, the main pressing member 11c is brought into pressure contact with the inner surface of the existing pipe rod C, the main gripper device 11 is fixed to the existing pipe rod C, and the traction jack 13 is extended, whereby the main beam 4 The shield body 1 can be moved forward via Then, after the push-pull jack 12d is contracted to bring the sub gripper device 12 closer to the main gripper device 11, the sub holding jack 11c is extended, and the sub pressing member 12c is brought into pressure contact with the inner surface of the existing pipe rod C so that the sub gripper device 12 is moved. The main gripper device 11 is advanced along the existing pipe rod C by fixing to the existing pipe rod C and then contracting the main holding jack 11b and then contracting the tow jack 13 and simultaneously extending the push-pull jack 12d. Can be made.
[0018]
The disassembling cutting device 5 is disposed in the middle portion of the main beam 4 and, as shown in FIG. 4, a plurality of wall saws 14a (a pair of left and right in the drawing) are moved in the radial direction and the axial direction so The axial body cutting device 14 capable of cutting the C wall body in the direction of the axial center O and a plurality of wall saws 15a (a pair of front and rear in the drawing) are moved in the radial direction and the circumferential direction to remove the wall body of the existing pipe rod C. It is comprised with the circumferential direction cutting device 15 which can be cut | disconnected in the circumferential direction.
[0019]
The disassembling erector device 6 is disposed at the rear part of the main beam 4 and holds the wall of the existing pipe C cut by the disassembling cutting device 5 so as to be transferred and carried out to a conveying device (not shown). is there.
[0020]
As shown in FIG. 2, the backfilling device 7 has a seal tube 16 slidably disposed in the axial direction at the rear of the shield body 1, and a movable partition wall 17 for backfilling is provided at the rear end of the seal tube 16. It is installed and closed over the entire surface. A backfilling material injection pipe 18 with a valve for injecting backfilling material from a backfilling material supply device (not shown) is provided through the movable partition wall 17. In addition, a partition moving jack 19 that moves the movable partition wall 17 while maintaining earth pressure according to the backfilling state is connected between the shield body 1 and the movable partition wall 17.
[0021]
Next, the excavating apparatus 3 according to the present invention will be described with reference to FIGS. 2, 3, 6 and 7.
From the middle part to the front part of the skin plate 2, a cylindrical inner peripheral plate 21 that is externally fitted to the existing pipe rod C through the seal member 24 so as to be slidable in the axial direction, and a space accommodated in the inner peripheral plate 21. It is comprised in the double structure which consists of the cylindrical outer periphery plate 22 which opens by 23 and is fitted. Further, a plurality of excavation bits 26 for excavating the outer peripheral ground of the existing pipe rod C and the backfill material are attached to the bit support ring 25 disposed at the front portion of the skin plate 2 at predetermined intervals. A cylindrical drive plate (drive member) 27 that drives the excavation bit 26 in the circumferential direction via the bit support ring 25 is disposed in the accommodation space 23. The drive plate 27 includes a sealing material and a bearing member. And is slidably fitted to the inner peripheral plate 21 in a circumferential direction. A cutter driving device 28 that reciprocates the excavation bit 26 in the circumferential direction is provided in the shield body 1, and the cutter driving device 28 is a pair of driving devices formed in the circumferential direction at the rear portion of the inner peripheral plate 21. Each of the bit rotating jacks is composed of a passive bracket 28a attached facing the opening 21a, and a pair of bit rotating jacks 28b connected between the passive bracket 28a and a predetermined position of the inner peripheral plate 21. By relatively driving 28b, the excavation bit 26 can be reciprocally rotated within a predetermined angle range via the drive plate 27 and the bit support ring 25. The material can be excavated.
[0022]
Further, the excavator 3 is provided with a feed / drain mud device 29 for supplying mud water to the excavation part and discharging excavated sediment together with the mud water. In the supply / drainage device 29, the storage space 23 is divided into a plurality of portions in the circumferential direction by a partition plate 29a projecting from the outer peripheral plate 22 along the shield axial direction, and between the outer peripheral plate 22 and the drive plate 27. A plurality of mud supply passages 29b and drainage passages 29c are alternately formed. The end plate 29d that closes the rear end of the storage space 23 is connected to the mud feed pipe 29e that communicates with the mud feed passage 29b, and the exhaust mud pipe 29f that communicates with the mud supply passage 29c. ing. Thereby, the mud supplied to the mud feed passage 29c from the mud feed pipe 29e is sent to the excavation part by the excavation bit 26 to promote excavation, and the mud accompanying the excavated soil is sent from the mud feed pipe 29e to the mud pipe 29f. Discharged.
[0023]
As a modification of the feed / drainage device 29, as shown in FIG. 8 and FIG. 9, the drive plate 27 is formed thick to feed a feed mud hole (mud feed means) 29g and a drain mud hole (drainage means). 29h may be drilled to open the bit support ring 25. A flexible hose can be used for each connection of the mud pipe 29e and the exhaust pipe 29f. Of course, mud-feeding / draining mud hose (mud feeding means) (mud feeding means) and mud feeding / draining pipes can be arranged along the storage space 23.
[0024]
In the above configuration, the dismantling cutting device 5 cuts the existing pipe rod C in the skin plate 2, the cut tube wall is removed by the dismantling erector device 6, and it is carried out by a conveying device (not shown). When the dismantling of the existing pipe rod C proceeds, the propulsion device 10 drives the gripper devices 11 and 12 and the traction jack 13 to propel the shield body 1.
[0025]
At this time, in the excavator 3, both the bit rotation jacks 28 b of the cutter driving device 28 are driven to expand and contract relative to each other, and the excavation bit 26 is reciprocally rotated via the drive plate 27 in the accommodation space 23. Thereby, the outer peripheral ground and the backfill material of the existing pipe rod C are excavated. And while excavation is accelerated | stimulated by the sending and discharging mud apparatus 29, excavation earth and sand are removed and discharged | emitted by mud.
[0026]
When the shield body 1 is advanced, the backfilling device 7 extends the partition wall moving jack 19 to maintain the position of the movable partition wall 17, and the backfill material is transferred from the backfill material injection pipe 18 to the rear part of the movable partition wall 17. In addition, the partition wall moving jack 19 is contracted while the earth pressure is maintained, and the movable partition wall 17 is moved forward.
[0027]
According to the above embodiment, in the excavator 3, the skin plate 2 is fitted to the existing pipe rod C while water is stopped by the seal member 24, and the inner space plate 21 has the accommodating space 23. Since the outer plate 22 is formed by the outer peripheral plate 22 that is opened and fitted, and the drive plate 27 that reciprocates the excavation bit 26 is disposed in the accommodation space 23, the outer diameter of the skin plate 2 is not so large. Therefore, the excessive excavation part by the excavation bit 26 can be reduced as much as possible. Further, since the drive plate 27 does not come into contact with the outer peripheral surface of the existing pipe rod C or the natural ground at all, the frictional resistance during excavation can be made extremely small, and the power of the cutter driving device 28 can be greatly increased compared to the conventional case. Can be reduced.
[0028]
Further, the mud passage 29a and the drainage passage 29b are formed by using the accommodation space 23, and the excavated earth and sand can be washed and collected, the excavation resistance of the excavation bit 26 can be reduced, wear is reduced, and excavation is performed. Can be performed smoothly and effectively.
[0029]
In addition, mud feeding means and mud discharging means can be provided by using the accommodation space 23 or the drive plate 27, so that piping and passages can be easily formed.
[0030]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the drive member for driving the excavation bit is arranged in the housing space of the skin plate having a double structure, the drive member is installed in the existing pipe or ground. There is no contact and there is almost no frictional resistance. Therefore, the excavation bit can be driven in the circumferential direction with a small driving force, and the driving force of the cutter driving device can be greatly reduced. Even with a double structure, the outer diameter of the skin plate can be reduced by forming the accommodating space small, and the extra excavation part on the outer periphery of the existing pipe can be reduced, resulting in the cost required for excavation. Can be reduced.
[0031]
According to the invention described in claim 2, since the excavation bit is configured to reciprocately rotate in the circumferential direction, a power transmission member (ring gear or the like) over the entire circumference becomes unnecessary, and the assembly and structure of the cutter driving device Can be simplified.
[0032]
Furthermore, according to the invention of claim 3 or 4, the mud supplied from the mud feed passage or the mud feed means is used to wash away the earth and sand and the backfill material excavated by the excavating bit, and the mud passage. Or since it collect | recovers from a mud discharge means, excavation can be implemented further easily and efficiently, and the power required for excavation can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a gutter showing an embodiment of a pipe gutter refill shield device according to the present invention.
FIG. 2 is an enlarged longitudinal sectional view of a main part of the shield device.
FIG. 3 is a cross-sectional view taken along the line AA shown in FIG.
4 is a cross-sectional view taken along the line BB shown in FIG.
5 is a cross-sectional view taken along the line CC shown in FIG.
FIG. 6 is an enlarged longitudinal sectional view showing an excavation device of the shield device.
FIG. 7 is a partially enlarged front view showing the excavator.
FIG. 8 is an enlarged longitudinal sectional view showing another embodiment of the excavator.
FIG. 9 is a partially enlarged front view showing the excavator.
[Explanation of symbols]
C Existing pipe 1 Shield body 2 Skin plate 3 Excavator 4 Main beam 4a Tip member 5 Dismantling cutting device 6 Dismantling erector device 7 Backfilling device 10 Propulsion device 11 Main gripper device 12 Sub gripper device 13 Traction jack 21 Inner peripheral plate 22 outer peripheral plate 23 accommodation space 24 seal member 25 bit support ring 26 excavation bit 27 drive plate 28 cutter drive device 28b bit rotating jack 29 feed mud device 29a partition plate 29b mud feed passage 29c waste mud passage

Claims (4)

Provide a shield body having a skin plate fitted around the outer periphery of the end of the existing pipe,
The skin plate is a double plate composed of an inner peripheral plate that is slidably fitted in an axial direction to an existing pipe via a seal member, and an outer peripheral plate that is fitted to the inner peripheral plate with an accommodation space. Structure and
A plurality of excavation bits that can excavate the outer peripheral portion of the existing pipe are disposed at the front of the skin plate,
A cutter driving device for driving the excavation bit in the circumferential direction is provided in the shield body, and a driving member for transmitting a driving force to the excavation bit is disposed in the accommodating space so as to be rotatable in the circumferential direction.
A propulsion device for propelling the shield body in a freely openable manner in the existing pipe;
A pipe wall backfilling shield device comprising a backfilling device for backfilling the promoted space in the rear part of the shield body. 2. The shield for backfilling pipes according to claim 1, wherein the cutter driving device is configured to reciprocate the excavation bit by a predetermined angle in the circumferential direction. A mud supply device that supplies mud water to the drilling bit and discharges the excavated sediment by the mud,
A mud feed passage to which the mud pipe is connected, by dividing the gap between the outer peripheral plate and the drive member, or the gap between the inner peripheral plate and the drive member in the circumferential direction in the accommodating space, The shield device for pipe wall backfilling according to claim 1 or 2, wherein a sludge passage to which the sludge pipe is connected is formed. A mud supply device that supplies mud water to the drilling bit and discharges the excavated sediment together with the mud water,
The pipe feeder backfill shield device according to claim 1 or 2, characterized in that a mud sending means and a mud discharging means are provided in the sending and discharging mud device along a housing space or a driving member.

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