JP5657472B2 - Muddy water type reconstruction propulsion device - Google Patents

Description

The present invention relates to a muddy water type reconstruction propulsion apparatus used in a construction for replacing an old sewer pipe with a new sewer pipe.

  In the construction of replacing sewer pipes that have expired after their useful life or have a problem in use due to the load of vehicles passing through the road due to poor ground, the existing pipes are crushed with a remodeling propulsion machine. However, the reconstruction promotion method that promotes the renewal pipe has been conventionally performed.

  On ground where groundwater is flowing or contains a large amount of groundwater, it may be difficult to propel because the ground will collapse. In such ground, a muddy water type reconstruction promotion method is employed (Patent Document 1).

  In the conventional muddy water type renovation promotion method, the muddy water pressure chamber is partitioned at the front of the front pipe by the cutter head and the bulkhead, and this muddy water pressure chamber is filled with muddy water and kept at a pressure that matches the earth pressure and groundwater pressure of the face. By doing so, the face is stabilized.

  Moreover, the earth and sand excavated by the rotation of the cutter head is mixed with muddy water and transferred to the outside of the mine. In the starter, a push jack for propelling the renewal pipe is arranged, and the renewal pipe is press-fitted with this push push jack while discharging muddy water. Outside the pit, a muddy water treatment device for separating the earth and sand from the discharged muddy water is provided, and the muddy water after separating the earth and sand is sent again to the muddy water pressure chamber.

JP 07-98077 A

In the conventional muddy water type reconstruction promotion method, the muddy water circulation system that circulates muddy water between the muddy water pressure chamber and the muddy water treatment device has two pipes, a mud pipe and a mud pipe, that are connected to the renewal pipe from the rear of the previous pipe. The pipe extends from the start shaft to the ground mud treatment device.
Thus, conventionally, since the muddy water circulation system was piped from the front pipe to the rear start shaft side through the renewal pipe, there was the following problem.

  First, a cutter drive device that rotates the cutter head is placed inside the tip conduit, but a large cutter drive device is installed due to the need to pass a mud pipe and a mud pipe. There was a problem that it was not possible to increase the output.

  Moreover, since the mud pipe and the mud pipe are passed through the renewal pipe, each time the renewal pipe is added, it is necessary to disconnect the mud pipe and the sludge pipe and add a new pipe. In that case, in order to maintain the muddy water pressure in the muddy water pressure chamber, the muddy water must be circulated by installing a bypass device in the front conduit and in the starting shaft. When resuming propulsion, it is necessary to disconnect the bypass device from the mud circulation system and reconnect the mud pipe and the mud pipe, resulting in poor work efficiency.

Accordingly, an object of the present invention is to solve the problems of the prior art, and to easily increase the output of the driving device so that the cutter head can be driven with a large torque. The purpose of the present invention is to provide a muddy water type renovation propulsion device that eliminates the need for a work such as reconnection and a bypass device by separating the mud pipe and the drainage pipe from the mud circulation system.

  In order to achieve the above-mentioned object, the present invention is configured such that the leading conduit between the starting stand and the reaching shaft is crushed by a cutter head provided at the tip of a leading conduit that precedes an existing pipe embedded in the ground. And a renovation propulsion device for propelling a new renewal pipe, comprising a rear water stop wall formed at the tip of the front conduit, and a front water stop wall disposed in front of the cutter head and inserted into the existing pipe. A swivel device, a mud water plant, and a mud water pump that connect the front conduit forming the mud water pressure chamber, the front water blocking wall and the face plate of the cutter head, and enable mud feeding into the mud water pressure chamber And a mud pump, and a mud pipe extending from the reach shaft through the existing pipe and connected to the swivel device and a drain pipe connected to the front water blocking wall, With pressure chamber A muddy water circulation system for circulating muddy water between the muddy water plant, a drive device that rotationally drives the cutter head, is attached to the back surface of the rear water blocking wall, and has a hollow output shaft serving as a muddy water passage; And a propulsion device that is installed in the start shaft and generates thrust for propelling the leading conduit and the renewal pipe.

It is a longitudinal section showing one embodiment of a muddy water type reconstruction promotion device by the present invention. It is a longitudinal cross-sectional view of the tip conduit | pipe of the muddy water type | formula reconstruction promotion apparatus. It is a longitudinal cross-sectional view which shows the modification of the tip conduit of FIG.

Hereinafter, an embodiment of a muddy water type reconstruction propulsion device according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a diagram showing an overall configuration of a muddy water type reconstruction propulsion apparatus according to the present embodiment. In FIG. 1, reference numeral 50 indicates an existing pipe that is an aged sewer pipe, and reference numeral 60 indicates an update pipe that is to be replaced with the existing pipe 50. Reference numeral 10 indicates a start shaft that has been excavated from the ground surface at the position where the existing pipe 50 is reconstructed, and reference numeral 12 indicates a manhole that is used as a reaching shaft. In addition, about the start shaft 10, in this invention, since there are few apparatuses installed in a start shaft, the existing manhole may be substituted.

  The muddy water type reforming propulsion apparatus to which the present invention is applied includes a leading conduit 14 and a propulsion apparatus 16 installed in the start shaft 10. An update pipe 60 is connected between the propulsion device 16 and the leading conduit 14. The rear end of the renewal tube 60 is connected to the extrusion table 15 of the propulsion device 16. The extrusion table 15 is installed on a guide frame 17 serving as a base so as to be movable in the propulsion direction. A hydraulic cylinder 18 that generates thrust for propelling the leading conduit 14 is attached to the extrusion table 15, and the tip of the piston rod 18 a of the hydraulic cylinder 18 is connected to a reaction force receiver 19. .

  Next, the leading conduit 14 is connected to the tip of the renewal tube 60, and the leading conduit 14 is provided with a cutter head 20 having the following configuration. The cutter head 20 includes a face plate 22 to which a plurality of cutters 21 are attached.

  As shown in FIG. 2, a motor 23 and a speed reducer 24 are installed coaxially with the front conduit 14 as a drive mechanism for rotating the cutter head 20 inside the front conduit 14. An output shaft 25 of the speed reducer 24 is connected to the face plate 22.

  A rear water stop wall 26 is formed in the front conduit 14, and a space in which the motor 23 and the speed reducer 24 are disposed and a muddy water pressure chamber 27 are arranged inside the front conduit 14 by the rear water stop wall 26. The speed reducer 24 is attached to the rear water blocking wall 26 while being partitioned. A front water blocking wall 28 is provided in front of the cutter head 20 so as to be inserted into the existing pipe 50. The muddy water pressure chamber 27 is formed so as to straddle the excavation portion at the front end of the leading pipe 14 and the rear end of the existing pipe 50, and the muddy water circulates at a pressure balanced with the earth pressure of the face and the groundwater pressure. Yes.

  The front water blocking wall 28 is a disk having a diameter smaller than the inner diameter of the existing pipe 50 and is supported by a swivel device 30 described later. An annular rubber packing 29 that seals the leakage of muddy water from the muddy water pressure chamber 27 is attached to the outer peripheral edge of the front water blocking wall 28. The rubber packing 29 is bent and pressed against the inner surface of the existing pipe 50, and keeps a sealed state while sliding on the inner surface of the existing pipe 50 as the leading pipe 14 advances.

  The output shaft 25 of the speed reducer 24 is configured as a hollow shaft, and a hollow swivel shaft 30 a is similarly connected to the output shaft 25. A mud feeding pipe 31 of a mud circulation system for sending and discharging mud into the mud pressure chamber 26 is connected to the swivel device 30 via a pipe joint 33. The swivel shaft 30a is rotatably supported by a bearing 35 in the main body 34. In the swivel shaft 30a and the output shaft 25 of the speed reducer 24, a muddy water passage 37 continuous in the axial direction is formed. An opening 37 a serving as an outlet of the muddy water passage 36 is opened on the side surface of the output shaft 25. On the other hand, a mud outlet 38 is formed in the front water blocking wall 28, and a mud pipe 32 is connected to the mud outlet 38 through a pipe joint 40.

  In the embodiment of FIG. 2, the muddy water fed from the mud pipe 31 is discharged from the opening 37 a through the muddy water passage 37 formed in the swivel shaft 30 a and the output shaft 25. A plurality of mud holes 41 are opened in the face plate 22, and the mud discharged from the openings 37 a is sent to the front of the face plate 22 through the mud holes 41 and passes through the mud pipe 32 from the mud outlet 38. Will be discharged. A plurality of stirring plates 42 for stirring the muddy water and earth and sand are attached to the back surface of the face plate 22.

  Next, the muddy water circulation system will be described with reference to FIG. In FIG. 1, reference numeral 43 indicates a mud pump. Reference numeral 44 indicates a muddy water plant. The muddy water plant includes a tank that stores muddy water, and also adjusts muddy water and separates earth and sand and crushed materials from the returned muddy water. The mud pump 43 and the mud plant 44 are disposed on the ground. The mud pipe 31 connected to the discharge port of the mud pump 43 is drawn into the reaching shaft 12 and connected to the swivel device 30 through the existing pipe 50.

  A mud pump 45 is installed at the bottom of the reaching shaft 12. The mud pipe 32 having one end connected to the front water blocking wall 28 is connected to a suction port of the mud pump 45. A mud pipe 46 is connected to the discharge port of the mud pump 45, and the mud pipe 46 is drawn from the reach shaft 12 and connected to the mud plant 44.

  In this embodiment, as shown in FIG. 1, the mud pipe 31 and the mud pipe 32 are bundled together with a wire 47, and the wire 47 is wound around a pulley 48 installed on the wall surface of the reaching shaft 12. Yes. A weight 49 is attached to the wire 47. The mud feeding pipe 31 and the mud discharging pipe 32 are tensioned so as to be always pulled in the propulsion direction of the tip conduit 14 by the weight of the weight 49.

  The muddy water type reconstruction propulsion apparatus according to the present embodiment is configured as described above. Next, the muddy water type reconstruction promotion method implemented using the muddy water type reformation promotion apparatus will be described.

  In FIG. 1 and FIG. 2, when the tip conduit 14 is pushed in by the hydraulic cylinder 18 while the face plate 22 of the cutter head 20 is rotated by the motor 23, the cutter 21 crushes the existing pipe 50 and excavates the ground. . During this time, the mud flowing from the mud feed pump 43 through the mud feed pipe 31 passes through the swivel device 30 and is sent to the mud pressure chamber 27 from the opening 37a of the output shaft 25.

  Then, the muddy water mixed with the earth and sand and the crushed material of the existing pipe 50 in the muddy water pressure chamber 27 and stirred by the stirring plate 42 is sucked into the mud pipe 32 from the mud port 38 by the mud pump 45 and further discharged. The mud pump 45 is sent to the mud plant 44 through the mud pipe 46. In this muddy water plant 44, earth and sand and crushed material are separated from muddy water.

  Since the mud water circulating in this manner maintains the pressure in the mud pressure chamber 27 at a pressure balanced with the earth pressure and the ground water pressure, even if the ground contains a large amount of ground water, the cutter does not collapse. Stable cutting with the head 20 is possible.

  Further, the muddy water pressure in the muddy water pressure chamber 27 is maintained by a seal by a rubber packing 29 attached to the outer peripheral edge portion of the front water blocking wall 28. Like this rubber packing 29, an annular rubber is pressed against the inner peripheral surface of the existing pipe 50. Therefore, while the inner pipe of the existing pipe 50 is slid along with the propulsion of the leading conduit 14, Even if the existing pipe 50 is deformed and distorted, the sealing function can be maintained and the muddy water pressure in the muddy water pressure chamber 27 can be maintained.

  Here, FIG. 3 shows an embodiment in which a ring-shaped air tube 52 is attached to the front water blocking wall 28 as a seal member instead of the rubber packing 29. In this case, air of a predetermined pressure is sealed in the air tube 52, and the air tube 52 is pressed against the inner peripheral surface of the existing tube 50 in a crushed state.

  Even if such an air tube 52 is used, a sealing performance equivalent to that of the rubber packing 29 can be obtained.

  The mud pipe 31 is connected to the swivel device 30 that supports the front water blocking wall 28 of the tip conduit 14, and the mud discharge pipe 32 is connected to the front water blocking wall 28, so that the muddy water pressure chamber 27 and the muddy water plant 44 are connected. It is possible to draw the pipe for sending and discharging mud of the mud circulation system that circulates the mud between them through the existing pipe 50 toward the front reaching shaft 12 without passing through the inside of the front conduit 14. In other words, it is not necessary to connect the pipe for sending and discharging mud in the mud circulation system to the start shaft 10 from the rear side, that is, from the leading pipe 14 through the renewal pipe 60 as in the conventional case.

  As a result, the installation space for the motor 23 and the speed reducer 24 disposed rearward from the rear water blocking wall 26 of the front conduit 14 is not restricted by the muddy water circulation system feed / drainage pipe. The entire cross-sectional area can be effectively used in the installation space, and in particular, a large motor can be adopted as the motor 23 and a drive device that outputs a large torque can be installed.

  Thus, the motor 23 is stopped every time the renewal pipe 60 is propelled by one while crushing the existing pipe 50. On the start shaft 10 side, after the update pipe 60 is removed from the push table 15 of the propulsion device 16, the push table 15 is moved backward by the hydraulic cylinder 18 and the next update pipe 60 is added. At this time, there is no need to separate the pipe for sending and discharging mud in the mud circulation system as in the prior art. Even if the rotation of the cutter head 20 is stopped, the mud circulation continues as it is.

While the renewal pipe 60 is added on the start shaft 10 side, the mud circulation continues between the mud pressure chamber 27 and the mud plant 44 without stopping through the mud circulation system described above. Thereby, since the muddy water pressure in the muddy water pressure chamber 27 is maintained even while the renewal pipe 60 is added, the situation where the face collapses can be prevented in advance.
When the addition of the renewal pipe 60 is completed and the propulsion is resumed, there is no need to connect the pipe for sending / discharging mud in the conventional mud circulation system.

  As described above, before and after the renewal pipe 60 is added, it is not necessary to disconnect and reconnect the muddy water circulation system's feed / drainage piping, and therefore, the conventional bypass device for maintaining the muddy water circulation. Is not required to be installed in the front conduit 14 or in the start shaft 10.

Next, when the propulsion is resumed and the update pipe 60 is pushed in by the hydraulic cylinder 18, the cutter head 20 crushes the existing pipe 50 and simultaneously excavates the ground.
During this time, when the leading pipe 14 gradually moves forward, the mud pipe 31 and the mud pipe 32 respectively connected to the swivel device 30 and the front water blocking wall 28 advance the leading pipe 14 as follows. At the same time, it is pulled toward the reaching shaft 12 side.

  In this embodiment, the mud feeding pipe 31 and the mud discharging pipe 32 are suspended by a wire 47 wound around a pulley 48, and the mud feeding pipe 32 and the mud discharging pipe 31 are While being pushed out to the reach shaft 12 side, it is pulled to the reach shaft 12 side by the weight of the weight 49 at the same time, so that the mud pipe 32 and the mud pipe 31 are smoothly entangled from the inside of the renewal pipe 60. It can be pulled out.

  In addition, a flexible reinforced vinyl hose having a length of several tens of meters can be used for the mud pipe 32 and the mud pipe 31. By using such a vinyl hose for the feed and discharge mud pipe, continuous work is possible.

  DESCRIPTION OF SYMBOLS 10 ... Starting shaft, 12 ... Reaching shaft, 14 ... Lead pipe, 15 ... Extrusion stand, 16 ... Propulsion device, 18 ... Hydraulic cylinder, 20 ... Cutter head, 21 ... Cutter, 22 ... Face plate, 23 ... Motor, 24 ... Deceleration Machine 25 ... output shaft 26 ... rear water blocking wall 27 ... muddy water pressure chamber 28 ... front water blocking wall 29 ... rubber packing 30 ... swivel device 30a ... swivel shaft 31 ... mud pipe 32 ... Mud pipe, 42 ... stirring plate, 43 ... mud pump, 44 ... mud plant, 46 ... mud pipe, 50 ... existing pipe, 60 ... renewal pipe

Claims (7)

A renovation propulsion device that propels a new renewal pipe together with the front pipe between the start-up resistance and the reaching shaft while crushing with a cutter head provided at the tip of the front pipe leading the existing pipe buried in the ground ,
A front water stop wall formed at the tip of the front conduit, and a front water stop wall disposed in front of the cutter head and inserted into the existing pipe, to form the muddy water pressure chamber;
A swivel device that connects the front water blocking wall and the face plate of the cutter head and enables mud feeding into the muddy water pressure chamber;
A mud plant, a mud pump and a mud pump, and a mud pipe connected to the swivel device and the mud pipe connected to the front water blocking wall, extending through the existing pipe from the reach shaft side, A muddy water circulation system for circulating muddy water between the pressure chamber and the muddy water plant,
A driving device that rotationally drives the cutter head, is attached to the back surface of the rear water blocking wall, and has a hollow output shaft that serves as a muddy water passage;
A propulsion device installed in the start shaft and generating thrust for propelling the leading conduit and the renewal pipe;
A muddy water type renovation propulsion device characterized by comprising   The swivel device has a swivel shaft having a muddy water passage communicating with the mud pipe, the output shaft of the drive device is connected to the swivel and the shaft, and a muddy water feed port is opened on the output shaft. The muddy water type reforming propulsion device according to claim 1, wherein   2. The muddy water type reforming propulsion device according to claim 1, wherein a stirring plate for stirring muddy water is attached to the back surface of the face plate of the cutter head.   The muddy water type reconstruction according to claim 1, wherein an annular rubber packing for water stop that can slide on an inner peripheral surface of the existing pipe is attached to an outer edge portion of the front water stop wall. Propulsion device.   2. The water stop air tube in which air is sealed in a ring shape capable of sliding on the inner peripheral surface of the existing pipe is attached to an outer edge portion of the front water stop wall. The muddy water type reconstruction propulsion device described.   The muddy water type reforming propulsion device according to claim 2, wherein the mud pipe and the mud pipe of the mud circulation system are made of a flexible resin hose.   The muddy water type reforming propulsion device according to claim 6, further comprising drawing means for constantly pulling the mud pipe and the mud pipe of the mud circulation system to the reach shaft side.

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