JP5340012B2 - Manhole pipe burial method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for burying a manhole pipe for reducing the amount of excavation assist agent used in the work for excavating a vertical hole for burying it. <P>SOLUTION: In this construction method for burying the manhole having an excavation bit in its bottom part into the ground while excavating the vertical hole for burying it by rotating and driving it by a manhole pipe burying device, a storage tank is communicated and connected with a discharge hole formed in the bottom part of the manhole pipe to form a supply flow passage for supplying the excavation assist agent stored in the storage tank into the ground through the discharge hole, and the storage tank is communicated and connected with a suction pipe arranged in a side part of the manhole pipe to form a suction flow passage for sucking the mud water discharged along the manhole pipe from an underground part into the storage tank. When excavating the ground, the excavation assist agent is supplied through the supply flow passage and is sucked together with the excavated soil through the suction flow passage to use the excavation assist agent by circulating it. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a manhole tube burying method for burying a manhole tube in the ground while excavating a vertical hole for burying by rotating a manhole tube having a drilling bit formed at the bottom by a manhole tube burying device.

  Conventionally, in order to embed a manhole tube in the ground, a method of excavating a buried vertical hole in the ground and then inserting the manhole tube into the buried vertical hole has been performed.

  However, in the above manhole pipe burying method, since the excavation work of the vertical hole for burial and the work of burying the manhole pipe are separate processes, the present inventor has disadvantages such as a long work time. A drill bit is formed at the bottom of the manhole tube to be buried, and this manhole tube is driven to rotate by a manhole tube embedding device to excavate a vertical hole for burial with the manhole tube itself. A method of burying in the ground has been developed (for example, see Patent Document 1).

  In this new manhole tube burial method, in order to facilitate the excavation work of the vertical hole for burial with the manhole tube, the bottom of the manhole tube is discharged from the bottom of the manhole tube while discharging a drilling aid such as water into the ground. The ground is excavated with a drill bit.

JP 2009-35872 A

  In the conventional manhole pipe burying method, a large amount of drilling aid is required because the drilling aid is discharged from the bottom of the manhole pipe into the ground during excavation work of the buried vertical hole.

  Therefore, in the conventional manhole pipe burying method, further improvement for reducing the amount of the drilling aid used as much as possible has been desired.

Therefore, in the present invention according to claim 1, a manhole pipe burying method for burying a manhole pipe in the ground while excavating a vertical hole for burying by rotating and driving a manhole pipe having a drilling bit formed at the bottom by a manhole pipe burying device In addition, a storage tank is connected to a discharge hole formed at the bottom of the manhole tube to form a supply flow path for supplying the drilling aid stored in the storage tank into the ground from the discharge hole, and at the side of the manhole tube A storage tank is connected to the arranged suction pipe to form a suction flow path for sucking muddy water discharged from the ground along the manhole pipe into the storage tank, and a drilling aid is supplied from the supply flow path during excavation. together with suction with excavated soil from the suction channel by recycling drilling auxiliaries, cylindrical barrel tube and the disc-like bottom body formed at the lower end of the manhole pipe and the trunk tube and bottom A cylindrical liner plate formed in close contact with the outer periphery of the tube, and after a manhole tube is buried in the ground, a through hole is formed in the trunk tube, and a communication hole is formed in the liner plate inside the through hole. Form a horizontal hole to connect the propulsion pipe to the manhole pipe, attach packing to the communication hole, and then push the propulsion pipe from the horizontal hole of the manhole pipe with a propulsion machine, and connect the propulsion pipe to the manhole pipe Decided to do.

  Further, in the present invention according to claim 2, in the present invention according to claim 1, a solid-liquid separation device is interposed in the suction channel, and only the liquid separated by the solid-liquid separation device is sucked into the storage tank. It was to be.

  And in this invention, there exists an effect described below.

  That is, in the present invention, in the manhole pipe burying method in which the manhole pipe is buried in the ground while excavating the vertical hole for burying by rotating the manhole pipe formed with the excavation bit at the bottom by the manhole pipe burying device, A suction pipe disposed on the side of the manhole pipe while forming a supply flow path for supplying the excavating aid stored in the storage tank into the ground through the discharge hole by connecting the storage tank to the discharge hole formed in the bottom. The storage tank is connected in communication to form a suction channel for sucking the muddy water discharged from the ground along the manhole pipe into the storage tank, and the excavating aid is supplied from the supply channel during excavation and from the suction channel. Since the excavation aid is circulated and sucked together with the excavated soil, the amount of excavation aid used during the excavation work for the buried vertical hole is reduced. Door can be.

  Moreover, since the excavation aid supplied to the ground is sucked together with the excavation soil excavated by the manhole pipe through the suction passage, the suction passage functions as a flow passage for sucking the excavation aid. It has a function as a flow path for sucking excavated soil, and the configuration of the flow path for sucking excavation aid and excavated soil can be simplified. Can be sucked at the same time, and the sucking operation can be performed smoothly.

  In particular, when a solid-liquid separation device is interposed in the suction channel and only the liquid separated by the solid-liquid separation device is sucked into the storage tank, the solid-liquid separation device removes the drilling aid and the drilling soil. It is possible to separate well, and the excavation aid after separation can be circulated and used, and no excavation soil is mixed into the supply flow path, and the load required to supply the excavation aid in the supply flow path (for example, , Pump load) can be suppressed.

The whole side view showing a manhole pipe embedding device. The whole front view. Side view ((a) When shortened, (b) When extended). Front view ((a) When shortened, (b) When extended). FIG. Side surface sectional view (a), plan view (b), and bottom view (c) showing a manhole tube. Explanatory drawing which shows a solid-liquid separator. Explanatory drawing which shows a manhole pipe embedding construction method. Explanatory drawing which shows a manhole pipe embedding construction method. Explanatory drawing which shows a manhole pipe embedding construction method. Explanatory drawing which shows a manhole pipe embedding construction method. Explanatory drawing which shows a manhole pipe embedding construction method (a side sectional view (a), a side enlarged sectional view (b), an inner peripheral surface enlarged view (c)).

  Below, the specific structure of the manhole pipe embedding construction method concerning this invention is demonstrated, referring drawings. In the following description, the configuration of the manhole tube burying device used in the manhole tube burying method will be described first, and then the configuration of the manhole tube burying method using the manhole tube burying device will be described.

  As shown in FIG. 1 and FIG. 2, the manhole tube embedding device 1 is attached to a pair of left and right support brackets 3, 3 formed at the tip of the heavy machine 2 so as to be able to tilt forward and backward, and is interposed between the heavy machine 2. The telescopic cylinder 4 is tilted back and forth by the forward / backward movement of the telescopic cylinder 4.

  The manhole tube burying device 1 rotates the manhole tube 5 by a rotation driving device 6 disposed so as to be movable up and down directly above the manhole tube 5 buried in the ground, and is integrated with the bottom of the manhole tube 5. The digging vertical hole 8 is excavated with the excavation bit 7 thus formed, and at the same time, the manhole pipe 5 is buried in the ground.

  As shown in FIGS. 3 to 5, the manhole tube embedding device 1 is provided with a lifting frame 10 on a fixed frame 9 fixed on the ground so as to be lifted and lowered via a pair of left and right telescopic cylinders 11 and 11. The rotary drive device 6 is disposed on the lift frame 10 through a pair of left and right front and rear lift chains 12 and 12 so that the drive shaft 13 of the rotary drive device 6 is formed in the manhole tube 5. It is connected to the shaft 14 (see FIGS. 1 and 2).

  Below, the specific structure of the fixed frame 9, the raising / lowering frame 10, and the rotation drive device 6 which comprise the manhole pipe | tube embedding apparatus 1 is demonstrated.

  First, the structure of the fixed frame 9 will be described. As shown in FIGS. 3 to 5, the fixed frame 9 has front brackets 16, 16 attached to front lower ends of a pair of left and right support bodies 15, 15 extended vertically. The outrigger 17 is screwed to the lower part of each front bracket 16 so as to be movable up and down, and the base end part of the telescopic cylinder 11 for raising and lowering is attached to the upper part of each front bracket 16 so as to be able to rotate back and forth.

  Further, the fixed frame 9 has rear brackets 18 and 18 formed at rear lower ends of the left and right supports 15 and 15, and left and right rear brackets 18 and 18 formed at the front end of the heavy machine 2. , 3 are attached so as to be pivotable up and down (see FIG. 1).

  In addition, the fixed frame 9 spans a pair of horizontal upper and lower guard pipes 19 and 20 projecting rearward between the rear upper parts of the left and right supports 15 and 15 and the rear middle part, A pair of left and right connecting pipes 21 and 21 are provided between the guard pipes 19 and 20, and a pair of left and right connecting pipes 22 and 22 are provided between the lower guard pipe 20 and the rear bracket 18. A connecting bracket 23 is attached to the lower center of the lower guard pipe 20, and the tip of the telescopic cylinder 4 attached to the heavy machine 2 so as to be vertically rotatable is attached to the connecting bracket 23 so as to be vertically rotatable (see FIG. 1). .)

  Next, the structure of the lifting frame 10 will be described. As shown in FIGS. 3 to 5, the lifting frame 10 is connected horizontally between the front upper ends of a pair of left and right lifting bodies 24, 24 extended vertically. A pair of left and right connecting brackets 26, 26 are attached to the left and right ends of the connecting body 25, and the tip of the elevating telescopic cylinder 11 is attached to each connecting bracket 26 so as to be able to rotate left and right.

  In addition, the lifting frame 10 spans a pair of horizontal upper and lower guard pipes 27, 28 projecting rearward between the rear middle parts of the left and right lifting bodies 24, 24, and the upper and lower guard pipes 27, A pair of left and right connecting pipes 29, 29 are interposed between the two.

  Further, the lifting frame 10 has bearings 30 and 31 attached to the upper and lower ends of the left and right lifting bodies 24 and 24, respectively, and a pair of front and rear lifting chains 12 and 12 are suspended between the upper and lower bearings 30 and 31. In addition, the starting end and the terminal end of each lifting chain 12 are separately fixed to the upper end of the support 15 of the fixed frame 9.

  Next, the structure of the rotary drive device 6 will be described. The rotary drive device 6 connects the lifting chains 12, 12 to the left and right ends of the main body 32 as shown in FIGS. A pair of left and right drive motors 33 are disposed on the upper portion, and a drive shaft 13 having a hollow cross section is protruded downward at the center of the lower portion of the main body 32.

  Further, the rotation drive device 6 has a connection pipe 34 formed on the upper portion of the main body 32, and the connection pipe 34 is connected to the hollow portion of the drive shaft 13 in communication. As will be described later, a supply device 35 for supplying a liquid such as a drilling aid or a solidifying agent is connected to the connection pipe 34 when the buried vertical hole 8 is excavated or when the manhole pipe 5 is fixed. ing.

  The manhole tube burying device 1 fixes the fixed frame 9 on the ground using the outrigger 17, and moves the lifting frame 10 up and down by driving the left and right lifting cylinders 11 and 11 forward and backward. In conjunction with the lifting operation, the rotary drive device 6 is moved up and down with respect to the lift frame 10 by the lifting chains 12 and 12, and further, the drive shafts 13 of the drive motors 33 and 33 of the rotary drive device 6 are rotationally driven to manhole. The rotating shaft 14 formed in the pipe 5 is rotated, and the buried vertical hole 8 is excavated by the excavation bit 7 at the bottom of the manhole pipe 5.

  Next, a specific structure of the manhole tube 5 will be described. As shown in FIG. 6, the manhole tube 5 has a disk-shaped bottom body 37 connected to the lower end portion of a cylindrical cylindrical tube 36 made of concrete. In addition, a metal cylindrical liner plate 50 is attached in close contact with the outer periphery of the trunk tube 36 and the bottom body 37, and a reinforcing body 51 assembled in a well shape inside the liner plate 50 is attached to the inside of the bottom body 37. (Upper) It is attached in a state exposed on the surface.

  The manhole tube 5 has a connecting flange 39 having a check valve 38 built in the center (upper) center of the bottom body 37, and a hollow rotating shaft 14 connected to the flange 39. The drive shaft 13 of the rotary drive device 6 is connected in communication.

  In addition, the manhole tube 5 has a drill bit 7 formed on the outer side (lower part) of the bottom body 37, and a penetrating discharge hole 40 that connects the inner side and the outer side in the center of the bottom body 37. Thus, the discharge hole 40 is connected to the connection pipe 34 through the flange 39 (check valve 38), the rotary shaft 14, and the drive shaft 13 of the rotary drive device 6.

  The manhole tube 5 is supplied with a liquid such as a drilling aid or a solidifying agent from a supply device 35 connected to the connection pipe 34 of the rotation drive device 6 when the buried vertical hole 8 is excavated or when the manhole tube 5 is fixed. The excavation aid and the solidifying agent can be supplied into the ground from the discharge hole 40 of the bottom body 37.

  Here, as shown in FIGS. 7 and 9, the supply device 35 connects the pump 44 to a storage tank 43 that stores excavation aids, solidifying agents, and the like, and drives the pump 44 to rotate the manhole tube embedding device 1. It connects with the connection pipe 34 of the apparatus 6 through the connection pipe 45, and, thereby, the storage tank 43 is connected in communication with the discharge hole 40 formed in the bottom part of the manhole pipe 5, and the excavation adjuvant or solidification stored in the storage tank 43 is carried out. A supply channel 52 for supplying the agent from the discharge hole 40 into the ground is formed.

  In addition, the supply device 35 connects a suction pump 47 to a suction pipe 46 disposed on the side of the manhole tube 5, and connects the suction pump 47 to the storage tank 43 via a solid-liquid separation device 53. The storage tank 43 is connected to a suction pipe 46 disposed on the side of the manhole tube 5 to form a suction channel 54 for sucking the muddy water discharged from the ground along the manhole tube 5 into the storage tank 43. ing.

  Then, the supply device 35 supplies the excavation auxiliary agent from the supply flow path 52 during excavation and sucks the excavated soil from the suction flow path 54, and sucks only the liquid separated by the solid-liquid separator 53 into the storage tank 43, As a result, the excavation aid can be recycled.

  In the solid-liquid separator 53, a siphon 56 is connected to the suction pump 47 via a connecting pipe 55, and a storage tank 43 is connected to the siphon 56 via a connecting pipe 57, while a storage tank 58 is disposed below the siphon 56. As a result, the muddy water that has entered from the top of the siphon 56 is separated into solid (mud) and liquid (water) by the centrifugal force inside the siphon 56, and a heavy solid is opened at the lower end of the siphon 56. From the inside of the siphon 56 to the storage tank 43.

  This solid-liquid separator 53 connects the connecting pipe 55 and the storage tank 58 via the bypass pipe 59 and the valve 60, and connects the storage tank 58 and the storage tank 43 via the pump 61, If there is a lot of solids in the muddy water, open the valve 60 and store all the muddy water sucked in the storage tank 58, while if there is a lot of water in the muddy water, open the valve 60 and drive the pump 61. Thus, all the mud water sucked in can be supplied to the storage tank 43 through the storage tank 58.

  As described above, the manhole pipe embedding device 1 embeds the manhole pipe 5 in the ground while excavating the vertical hole 8 for burying by rotating the manhole pipe 5 having the excavation bit 7 formed at the bottom. It is composed.

  Next, a manhole pipe burying method for burying the manhole pipe 5 in the ground using the manhole pipe burying apparatus 1 having the above configuration will be described.

  In the manhole pipe embedding method, first, as shown in FIG. 8, a vertical hole-shaped excavation hole 41 having a diameter larger than the manhole pipe 5 buried at a predetermined depth from the ground is formed. A cylindrical conductor pipe 42 is fitted and embedded in the inner surface.

  Next, as shown in FIG. 9, the manhole pipe 5 is placed at the center of the inside of the conductor pipe 42 of the excavation hole 41, the manhole pipe embedding device 1 is installed at a predetermined position, and the manhole pipe embedding device 1 is driven to rotate. The rotating shaft 14 of the manhole tube 5 is connected to the driving shaft 13 of the device 6. Further, a storage tank 43 storing water as a drilling aid and a pump 44 are connected to a connection pipe 34 of the rotary drive device 6 of the manhole pipe burying device 1 through a connection pipe 45, and a conductor pipe 42 of the drill hole 41 is provided. Is connected to a suction pump 47.

  The elevating frame 10 is lowered by reversing the elevating telescopic cylinders 11 and 11 of the manhole tube embedding device 1, and the rotary driving device 6 is operated by the elevating chains 12 and 12 in conjunction with the lowering operation of the elevating frame 10. Is lowered with respect to the lifting frame 10, and the rotation shaft 14 formed on the manhole tube 5 is rotated by rotationally driving the drive shafts 13 of the drive motors 33, 33 of the rotation drive device 6. The excavation bit 7 is used to excavate the vertical hole 8 for embedding and the manhole pipe 5 is gradually embedded in the ground.

  At this time, as shown in FIG. 10, by supplying the excavating aid from the supply device 35, the excavating aid is discharged from the discharge hole 40 of the manhole pipe 5 into the ground, and the excavating soil 48 in the excavating part is discharged. The excavated soil 48 can be smoothly excavated by the excavation bit 7, and the excavated soil 48 removed by excavation by driving the suction pump 47 becomes muddy water along the outer periphery of the manhole pipe 5. The suction pipe 46 sucks and eliminates the discharge to the inside of the conductor pipe 42. At the time of excavation, the excavation aid is supplied from the supply flow path 52 and sucked together with the excavation soil 48 from the suction flow path 54, and only the liquid separated by the solid-liquid separator 53 is sucked into the storage tank 43 to assist excavation. The agent is recycled.

  Further, when excavating to a predetermined depth, the elevating frame 10 is raised by driving the elevating telescopic cylinders 11 and 11 of the manhole tube burying device 1 to advance, and the elevating frame 10 is moved up and down in conjunction with the ascending operation of the elevating frame 10 The rotary drive device 6 is raised with respect to the lifting frame 10 by the chains 12, 12, and another trunk pipe 36 is connected to the upper part of the trunk pipe 36 of the manhole pipe 5, and separately from the upper part of the rotating shaft 14 of the manhole pipe 5. Then, the manhole tube 5 is embedded while excavating the embedding vertical hole 8 to the set depth by excavating the embedding vertical hole 8 again with the manhole tube 5.

  After that, as shown in FIG. 11, a supply device 35 comprising a storage tank 43 storing a solidifying agent and a pump 44 is connected to a connection pipe 34 of the rotary drive device 6 of the manhole tube embedding device 1 via a connection pipe 45. The rotation drive device 6 rotates the manhole tube 5 in the direction opposite to that during excavation, and the solidifying agent is discharged from the discharge hole 40 of the manhole tube 5 toward the ground by supplying the solidifying agent from the supply device 35. Then, the solidifying agent is supplied while being dispersed in the excavation soil 49 at the bottom or outer periphery of the manhole tube 5.

  Thereafter, the drive of the rotation drive device 6 of the manhole tube burying device 1 and the drive of the supply device 35 are stopped, and the drive shaft 13 of the rotation drive device 6 of the manhole tube burying device 1 and the rotation shaft 14 of the manhole tube 5 are separated. At the same time, the flange 39 and the rotating shaft 14 of the manhole tube 5 are separated from each other, the rotating shaft 14 is removed, and the solidifying agent is hardened by being left for a predetermined time to fix the manhole tube 5 in the ground.

  Then, after the manhole tube 5 is buried in the ground, as shown in FIG. 12, a circular through hole 62 is formed in the trunk tube 36 of the buried manhole tube 5 and the liner plate 50 is formed inside the through hole 62. A circular communication hole 63 is formed in the hole, a horizontal hole is formed in the manhole pipe 5 to connect a propulsion pipe extending in the horizontal direction, and a rubber disc packing 64 is formed in the communication hole 63 with a steel circle. Install using an annular ring 65.

  Thereafter, a base 66 is welded to the upper surface of the reinforcing body 51 exposed on the inner surface (bottom surface) of the manhole tube 5, and a propulsion unit 67 for propelling the propelling pipe to the reinforcing body 51 through the base 66 is installed for propulsion. The propulsion pipe is propelled from the side hole of the manhole pipe 5 by the machine 67 and the propulsion pipe is connected to the manhole pipe 5.

  As described above, in the manhole tube burying method, the manhole tube 5 is grounded while excavating the vertical hole 8 for burying by rotating the manhole tube 5 having the excavation bit 7 formed at the bottom by the manhole tube burying device 1. I am trying to embed it inside.

  Moreover, in the manhole pipe burying method, the supply flow for supplying the excavating aid stored in the storage tank 43 by connecting the storage tank 43 to the discharge hole 40 formed at the bottom of the manhole pipe 5 from the discharge hole 40 into the ground. Suction for forming the passage 52 and connecting the storage tank 43 to the suction pipe 46 disposed on the side of the manhole pipe 5 to suck the muddy water discharged from the ground along the manhole pipe 5 into the storage tank 43 Since the channel 54 is formed, the excavation aid is supplied from the supply channel 52 during excavation, and the excavation aid is circulated and sucked from the suction channel 54 together with the excavation soil 48. The amount of use of the drilling aid during the drilling operation 8 can be reduced.

  In the manhole pipe burying method, the excavation aid supplied into the ground is sucked by the suction passage 54 together with the excavation soil 48 excavated by the manhole pipe 5, so that the suction passage 54 is provided with the excavation aid. The function of the flow path for sucking the excavation soil 48 and the function of the flow path for sucking the excavation soil 48 are combined, and the configuration of the flow path for sucking the excavation aid and the excavation soil 48 is simplified. In addition, the excavating aid and the excavating soil 48 can be sucked at the same time, and the sucking work can be performed smoothly.

  In the manhole tube burying method, a solid-liquid separation device 53 is interposed in the suction channel 54, and only the liquid separated by the solid-liquid separation device 53 is sucked into the storage tank 43. The separation device 53 can separate the excavation aid and the excavation soil 48 satisfactorily, and can circulate and use the excavation aid after separation, and the excavation soil 48 is not mixed into the supply flow path 52. The load required for supplying the drilling aid in the supply channel 52 (for example, the load of the pump 44) can be suppressed.

  Further, in the manhole tube burying method, the manhole tube 5 is formed by adhering the cylindrical body tube 36 and the disk-shaped bottom body 37 formed at the lower end thereof to the outer periphery of the body tube 36 and the bottom body 37. And a through hole 62 is formed in the trunk tube 36 after the manhole tube 5 is buried in the ground, and a communication hole 63 is formed in the liner plate 50 inside the through hole 62. Since the lateral hole for connecting the propulsion pipe to the manhole pipe 5 is formed, it is possible to reduce labor, time and cost required for the operation of connecting the propulsion pipe to the manhole pipe 5.

  Further, in the manhole pipe burying method, a reinforcing body 51 is provided inside the liner plate 50 so as to be exposed on the surface of the bottom body 37 of the manhole pipe 5, and a propulsion device 67 for propelling the propulsion pipe to the reinforcing body 51 is provided. Since the propulsion unit 67 is used to propel the propulsion tube from the side hole of the manhole tube 5, it is possible to firmly fix the propulsion unit 67 while increasing the strength of the manhole tube 5 with the reinforcing body 51. It is possible to connect the manhole tube 5 and the propulsion tube smoothly and safely.

DESCRIPTION OF SYMBOLS 1 Manhole pipe embedding device 2 Heavy machine 3 Support bracket 4 Telescopic cylinder 5 Manhole pipe 6 Rotation drive device 7 Excavation bit 8 Vertical hole for embedding 9 Fixed frame 10 Lifting frame
11 Lifting telescopic cylinder 12 Lifting chain
13 Drive shaft 14 Rotating shaft
15 Support 16 Front bracket
17 Outrigger 18 Rear bracket
19,20 Guard pipe 21,22 Connecting pipe
23 Connecting bracket 24 Lifting body
25 Connecting body 26 Connecting bracket
27,28 Guard pipe 29 Connecting pipe
30,31 Bearing 32 Body
33 Drive motor 34 Connection pipe
35 Feeder 36 Trunk tube
37 Bottom 38 Check valve
39 Flange 40 Discharge hole
41 Drilling hole 42 Conductor pipe
43 Storage tank 44 Pump
45 Connecting pipe 46 Suction pipe
47 Suction pump 48,49 excavated soil
50 Liner plate 51 Reinforcing body
52 Supply channel 53 Solid-liquid separator
54 Suction channel 55 Connecting pipe
56 Siphon 57 Connecting pipe
58 Storage tank 59 Bypass pipe
60 Valve 61 Pump
62 Through hole 63 Communication hole
64 Packing 65 Ring
66 Base 67 Propeller

Claims (2)

In the manhole pipe burying method of burying the manhole pipe in the ground while excavating the vertical hole for burying by rotating the manhole pipe with the excavation bit formed at the bottom with a manhole pipe burying device,
A storage tank is connected to the discharge hole formed at the bottom of the manhole pipe to form a supply flow path for supplying the drilling auxiliary agent stored in the storage tank into the ground from the discharge hole, and disposed on the side of the manhole pipe The storage tank is connected to the suction pipe connected to form a suction channel that sucks the muddy water discharged from the ground along the manhole pipe into the storage tank. Suction with the excavated soil from the flow path to circulate and use the drilling aid ,
The manhole tube is composed of a cylindrical body tube, a disk-shaped bottom body formed at the lower end of the manhole tube, and a cylindrical liner plate formed in close contact with the outer periphery of the body tube and the bottom body. A through hole is formed in the body tube after being embedded in the tube, a communication hole is formed in the liner plate inside the through hole, a lateral hole for connecting the propulsion tube is formed in the manhole tube, and packing is provided in the communication hole. mounting, then, by promoting propulsion tube from the lateral hole of the manhole tube propulsion units, manhole pipes buried method characterized that you connect the propulsion tube manhole pipe. 2. The manhole tube embedding method according to claim 1, wherein a solid-liquid separation device is interposed in the suction flow path, and only the liquid separated by the solid-liquid separation device is sucked into the storage tank.

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