JP4372502B2 - Updating apparatus and updating method for existing buried pipe - Google Patents

Description

  The present invention relates to an apparatus and method for renewing an existing buried pipe buried in the ground to a new buried pipe, and more specifically, sewage or a large amount of rainwater flowing from the upstream side during the renewal work. The present invention relates to a technique for improving so that it can flow smoothly without overflowing to the ground surface.

  Underground pipes used for various purposes, including water and sewage systems, etc., are aging due to changes over time, so it is necessary to replace them with new buried pipes (update pipes) at appropriate times. At this time, in order to increase the allowable flow rate, the existing buried pipe having a small diameter may be removed and replaced with a larger diameter buried pipe.

  In this case, the ground where the existing buried pipe is buried is excavated from the ground surface and the existing buried pipe is excavated, and then a new pipe is suspended and buried again, or as shown in FIGS. A method of removing an existing buried pipe and exchanging it with an updated pipe while digging in a horizontal direction from one vertical shaft dug on the ground surface to the other vertical shaft is used.

  In the conventional existing buried pipe renewal method shown in FIG. 8, the start pit 3 and the arrival mine 4 are dug on the ground surface G in order to replace the existing buried pipe 1 with the updated pipe 2. A screw auger 6 extending forward from a propulsion device 5 disposed at the bottom of the start pit 3 and a cutter 7 provided at the tip thereof are rotationally driven by a drive motor 8 of the propulsion device 5. The existing buried pipe 1 crushed by the rotation of the cutter 7 is taken out to the start pit 3 side through a cylindrical casing 9 and removed outside the start pit 3. At the same time, the shield pipe 11 and the update pipe 2 are displaced forward by extending the hydraulic piston 10 provided in the propulsion unit 5, and the existing buried pipe 1 is sequentially replaced with the update pipe 2.

  In the operation of replacing the existing buried pipe 1 with the renewal pipe 2, sewage W flows from the upstream pipe 12 as shown by the arrow in FIG. 8, and this sewage W is being renewed. The upstream end of the existing buried pipe 1 is sealed with a packer 13 or the like so as not to enter the inside of the existing buried pipe 1. The sewage W collected at the bottom of the reaching mine 4 is pumped up by a submersible pump 14 provided at the bottom of the reaching mine 4 and transferred via a pipe 15 extending from the ground surface G to the starting pit 3. And it drains in the downstream pipe line 16 through the part 15a extended through the packer 17 which has sealed the upstream end of the downstream pipe line 16 among the piping 15. FIG.

Further, in the other conventional method of updating the existing buried pipe shown in FIG. 9, the existing buried pipe 1 is not illustrated while being sequentially crushed by the rotary cutter 19 of the excavator 18 provided inside the shield pipe 11. Sediment and crushed pieces are discharged to the outside of the start pit 3 on muddy water supplied and drained through a pipeline. Further, the pipe line 20 extending forward from the excavator 18 extends forward via the seal mechanism 21 and sucks the sewage W accumulated on the upstream side. Then, the sucked sewage W is drained into the downstream pipe line 16 through the tip 22a of the pipe 22 connected to a pump (not shown) (see Patent Document 1 below).
JP 7-98077 A

  By the way, in the conventional existing pipe renewal method shown in FIGS. 8 and 9, it is necessary to discharge the sewage W flowing from the upstream pipe 12 to the downstream pipe 16, so that the buried pipe renewal work is performed. Even inside, the flow of sewage W cannot be blocked.

  However, since the temporary pipes 15 and 22 are very thin compared to the existing buried pipe 1 and the renewed pipe 2, the drainage cannot catch up when a large amount of rainwater flows along with the rain, and the rainwater including the sewage reaches the pit 4 Overflowing from the ground and polluting the ground surface G. Furthermore, the propulsion unit 5 disposed in the start pit 3 may be submerged and the mechanical part may be broken.

  Accordingly, an object of the present invention is to provide an existing buried pipe renewal device capable of smoothly flowing down a large amount of rainwater flowing from the upstream side to the downstream side without overflowing the ground surface.

The means described in claim 1 for solving the above problem is as follows.
While crushing the existing buried pipe by the cutter with a screw auger which advances along the existing buried pipe to reach anti from starting pit was Ho設on the ground surface, sequentially promote update pipe by propulsion unit of the start in the pit A device for updating the existing buried pipe,
A drainage pipe to be laid in the interior of the front Symbol existing buried pipe,
Bei example and a drain pump for draining the drainage pipe pumped down water flowing to the arrival downhole,
The screw auger
A tubular casing for earth removal propelled inside the renewal pipe;
A tubular screw rod that is rotationally driven by the propulsion device inside the tubular casing;
A cutter head fixed to the distal end of the tubular screw rod and rotating integrally, supporting the cutter while having a communication portion for communicating the front side and the rear side in the propulsion direction;
Extends helically around the tubular screw rod along the inner circumferential surface of said tubular casing while opening the annular gap when viewed from the axial direction between the outer peripheral surface of the inner periphery and the tubular screw rod A screw blade supported by a support member projecting from the outer peripheral surface of the tubular screw rod and rotating integrally with the tubular screw rod ;
The drain pipe has a rear end coaxially connected to a front end of the tubular screw rod,
And the propulsion device has a tubular drive unit that is coaxially connected to the rear end of the tubular screw rod and rotationally drives the tubular screw rod ,
The sewage that has flowed into the reaching mine can be drained to the start pit side via the drain pump, the drain pipe, the tubular screw rod, and the drive unit,
In addition, a large amount of rainwater that has flowed into the reaching pit is formed between the outer peripheral surface of the drain pipe and the inner peripheral surface of the existing buried pipe, and the outer peripheral surface of the tubular screw rod and the inner peripheral edge of the screw blade. It is comprised so that it can drain to the said start pit side through the clearance gap between them.

Further, the means described in claim 2 for solving the above-described problem is that after the propulsion device is lifted from the start pit and retracted to the ground with respect to the existing buried pipe update device described in claim 1 A connection pipe connecting the end of the tubular casing on the start pit side and a downstream pipe line;
A large amount of rainwater that has flowed into the reaching pit is transferred to the downstream side through the existing buried pipe, the gap between the outer peripheral surface of the tubular screw rod and the inner peripheral edge of the screw blade, the tubular casing, and the connecting pipe. It is characterized in that it can be drained into the pipe line.

The means described in claim 3 for solving the above problem is a method of updating an existing buried pipe using the apparatus described in claim 1,
The drainage pipe is sequentially propelled by the propulsion unit to lay a drainage pipe inside the existing buried pipe, and the tubular screw rod is connected to the rear end of the drainage pipe and the rear end of the tubular screw rod. Connecting the drive unit,
Rotating the tubular screw rod using the propulsion device to rotate the cutter and crushing the existing buried pipe while discharging the crushed pieces to the start pit side by the screw blades,
The tubular casing and the renewal pipe are sequentially propelled using the propulsion device,
The drainage pump inflow sewage into the reach the pit, the drainage tube, as well as waste water to the starting pit side through the tubular screw rod and the driving unit,
A large amount of rainwater that has flowed into the reaching pit is between the outer peripheral surface of the drainage pipe and the inner peripheral surface of the existing buried pipe, and between the outer peripheral surface of the tubular screw rod and the inner peripheral edge of the screw blade. It is characterized by draining to the start pit side through a gap .

Further, means described in claim 4 is the method of updating an existing buried pipe according to claim 3, after backing on the ground lifting the propulsion unit from the start in the pit,
Connecting the end of the tubular casing on the start pit side and the pipe line on the downstream side using a connecting pipe,
A large amount of rainwater that has flowed into the reaching pit is transferred to the downstream side through the existing buried pipe, the gap between the outer peripheral surface of the tubular screw rod and the inner peripheral edge of the screw blade, the tubular casing, and the connecting pipe. It is characterized by draining into a pipe line.

That is, the screw auger used in the conventional existing buried pipe renewal device has screw blades standing in a spiral manner on the outer peripheral surface of a columnar screw rod. Thereby, the inner peripheral edge of the screw blade is in close contact with the outer peripheral surface of the screw rod, and there is no gap between them. Further, the outer peripheral edge of the screw blade is disposed so as to approach the inner peripheral surface of the tubular casing for efficient soil removal.
Therefore, even if a large amount of rainwater is drained through the conventional screw auger having such a configuration, the resistance to the rainwater to flow is large, and a large amount of rainwater cannot be drained smoothly.
In addition, since the screw rod extends in a columnar shape, it was not possible to drain the sewage that flowed from the upstream side into the reaching mine to the starting mine side via the screw rod.

  On the other hand, in the screw auger used for the existing buried pipe updating apparatus according to the present invention, a gap is opened between the outer peripheral surface of the screw rod and the inner peripheral edge of the screw blade extending in a spiral shape. A large amount of rainwater can be drained through.

Further, since the driving portion of the screw rod and propulsion device is configured tubular, a small amount flowing into the arrival pit sewage, drainage pump provided to the arrival downhole drainage conduit laid in existing buried pipe, tubular The screw can be smoothly drained to the start pit side through the screw rod and the tubular drive unit of the propulsion unit.

Furthermore, after backing on the ground lift the propulsion unit from the starting pit, because connecting the ends of the starting pit side of the tubular casing and the downstream side of the pipe with a connecting pipe, a large amount that has flowed to the arrival downhole Can be smoothly drained from the tubular casing to the downstream pipe line via the connecting pipe.

Hereinafter, with reference to FIG. 1 thru | or FIG. 5, one Embodiment of the update apparatus and the update method of the existing embedment pipe which concern on this invention is described in detail.
In the following description, the same reference numerals are used for the same parts as those in the above-described prior art, and a duplicate description is omitted, the front in the propulsion direction is referred to as the front side, and the rear in the propulsion direction is referred to as the rear side.

  First, with reference to FIG. 1 thru | or FIG. 3, the update apparatus 100 of the existing underground pipe | tube in this embodiment is demonstrated in detail.

As shown in FIG. 1, a propulsion device 30 is disposed at the bottom of the start pit 3 dug in the ground surface G.
The propulsion unit 30 sequentially propels a drain pipe 51, a screw auger 40, an update pipe 2 and the like, which will be described later, from the start pit 3 toward the arrival pit 4, and also serves to drive the tubular screw rod 41 to rotate.
The propulsion device 30 has a structure in which a tubular drive unit 31 extending in the propulsion direction is rotationally driven by a drive motor 32 and the propulsion plate 34 is reciprocated in the propulsion direction by a hydraulic piston 33 extending in the propulsion direction. .

The tubular drive unit 31 is provided with a flange 31a for connecting the drain pipe 51 and the rear end of the tubular screw rod 41 at the front end thereof, and the front end of the downstream drain pipe 61 described later is connected to the rear end thereof. A flange 31b is provided.
The inner diameter of the tubular drive unit 31 is set to be the same as that of the drain pipe 51 and the tubular screw rod 41.

A screw auger 40 that sequentially crushes the existing buried pipe 1 and discharges it to the start pit 3 side together with the surrounding earth and sand is connected to the front end of the tubular drive unit 31 of the propulsion machine 30 and extends coaxially in the propulsion direction and a drive motor 32. It has a tubular screw rod 41 that is driven by and rotates integrally.
The cutter head 42 fixed to the front end of the tubular screw rod 41 rotatably supports a total of four disc cutters 43 as shown in FIG. A gap (communication portion) S1 that communicates with the side is provided.
The cutter head 42 is rotatably supported inside the shield tube 44 by support means (not shown).
A front end of a tubular casing 45 extending coaxially in the propulsion direction is connected to the inner peripheral surface of the shield tube 44 via a tapered portion 45a.
Further, the screw blade 46 extending spirally around the tubular screw rod 41 is viewed from the axial direction between the inner peripheral edge 46a and the outer peripheral surface 41a of the tubular screw rod 41 as shown in FIG. It arrange | positions so that annular clearance S2 may open.
Furthermore, the screw blades 46 are supported by an elongated support member 47 projecting from the outer peripheral surface 41 a of the tubular screw rod 41.
The tubular screw rod 41 and the screw blade 46 are dimensioned to have a length substantially equal to the stroke of the hydraulic piston 33 of the propulsion device 30, and are arranged in the propulsion direction and connected to each other by flanges to reach the arrival shaft from the start shaft 3 side. It can be connected to a length up to 4.

The drain pipe 51 is connected to the front end of the tubular drive part 31 of the propulsion device 30 or the front end of the tubular screw rod 41 of the screw auger 40, and forms the drain pipe 50 together with the tubular drive part 31 and the tubular screw rod 41.
The drain pipe 51 is dimensioned to have a length substantially equal to the stroke of the hydraulic piston 33 of the propulsion device 30 and is connected to the length from the start pit 3 side to the arrival pit 4 by being connected to each other in a flanged manner in the propulsion direction. can do.
Further, a support arm 53 is attached to the drain pipe 51 via a bearing 52, and the drain pipe 51 is supported coaxially within the existing buried pipe 1 and movable in the propulsion direction.

Further, the rear end flange 31b of the tubular drive unit 31 of the propulsion device 30 is for draining sewage flowing down through the drain pipe 51, the tubular screw rod 41, and the tubular drive unit 31 to the downstream pipe line 16. The drain pipe 61 can be detachably connected.
The rear end 61 a of the drain pipe 61 passes through the packer 17 that seals the upstream end of the downstream pipe line 16, extends into the downstream pipe line 16, and sewage into the downstream pipe line 16. Drain.

  Next, a method of updating the existing buried pipe 1 to the update pipe 2 using the above-described apparatus 100 will be described with reference to FIGS.

In the first stage of the operation of updating the existing buried pipe, as shown in FIG. 4, the drain pipe 51 is installed inside the existing buried pipe 1 by using the hydraulic piston 33 of the propulsion unit 3 provided at the bottom of the start pit 3. The drainage pipes 50 are completed by connecting the plurality of drainage pipes 51 to each other while sequentially propelling them.
Further, the rear end of the upstream pipe 12 is sealed by the packer 13 and the sewage W1 accumulated in the upstream pipe 12 is pumped by the submersible pump 14 and connected to the front end of the drain pipe 50. 15 is drained into the drainage pipe 50.
Further, the rear end of the drain pipe 50 is connected to the tubular drive unit 31 of the propulsion device 30.
Further, a drain pipe 61 is connected to the rear end of the tubular drive unit 31 of the propulsion device 30.
Thereby, the sewage W1 collected from the upstream pipe 12 is pumped up by the submersible pump 14 and drained into the downstream pipe 16 via the drain pipe 50, the tubular drive unit 31 and the drain pipe 61 ( W2).

In the second stage of the work of updating the existing buried pipe, the propulsion plate 34 of the propulsion device 30 provided at the bottom of the start pit 3 is fully retracted, and then the screw auger 40 and the update pipe 2 are placed in the start pit 3. As shown in FIG. 5, the front end of the tubular screw rod 41 is connected to the rear end of the drain pipe 50, and the rear end of the tubular screw rod 41 is connected to the front end of the tubular drive unit 31. Next, while driving the drive motor 32 to rotate the tubular screw rod 41, the hydraulic piston 33 is extended to propel the screw auger 40 and the update pipe 2.
As a result, the rear end of the existing buried pipe 1 is crushed by the disk cutter 43 that rotates integrally with the tubular screw rod 41, and the inside of the tubular casing 45 is conveyed into the start shaft 3 by the screw blades 46 together with the surrounding earth and sand. Can be removed.
When the front end of the drainage pipe 50 protrudes into the access pit 4 as the screw auger 40 and the renewal pipe 2 are propelled, one drainage pipe 51 is removed from the front end of the drainage pipe 50 and the pipe 15 extending from the submersible pump 14 is removed. The tip of is replaced with the tip of the drainage pipe 50.
Thereby, the sewage W1 flowing down from the upstream pipe 12 can be drained (W2) to the downstream pipe 16 while crushing the existing buried pipe 1 and propelling the renewal pipe 2.

  In the third stage of the work of renewing the existing buried pipe, as shown in FIG. 6, the tubular screw rod 41, the screw blade 46, the tubular casing 45, and the renewed pipe 2 are sequentially connected and propelled, and the drainage pipe The operation of removing the drain pipes 51 at the front end of each of 50 and the operation of replacing the tip of the pipe 15 extending from the submersible pump 14 with the tip of the drain pipe 50 are repeated to update the existing buried pipe 1 to the update pipe 2. Complete.

  By the way, when a large amount of rainwater is predicted by the weather forecast, as shown in FIG. 7, after the propulsion device 30 is lifted from the inside of the start pit 3 and retreated to the ground surface G, the connection pipe 70 is connected to the start pit. 3, the outer pipe 71 of the connection pipe 70 is connected to the rear end of the tubular casing 45, and the inner pipe 72 of the connection pipe 70 is slid and connected to the downstream pipe line 16.

  At this time, as shown in FIG. 2, the cutter head 42 is provided with a gap S1 for communicating the front side and the rear side in the propulsion direction, and as shown in FIG. Since an annular gap S2 is opened between the outer peripheral surface 41a of the tubular screw rod 41 when viewed from the axial direction, a large amount of rainwater can be drained through the tubular casing 45 of the screw auger 40.

  Therefore, a large amount of rainwater that has flowed into the reaching pit 4 from the upstream pipe 12 smoothly flows into the downstream pipe via the existing buried pipe 1, the tubular casing 45 of the screw auger 40, and the connection pipe 70. Can flow down.

  In the above description, the left side pipe 12 shown in the drawing is the upstream side, and the right side pipe 16 is shown on the downstream side. However, the apparatus and method of the present invention are also applicable to pipes having opposite upstream and downstream relationships. It goes without saying that can be applied.

The longitudinal cross-sectional view which shows one Embodiment of the update apparatus of the existing buried pipe which concerns on this invention. The cross-sectional view along the II-II fracture line shown in FIG. The cross-sectional view along the III-III break line shown in FIG. Side surface sectional drawing which shows the state which drains sewage through a drain pipe. Side surface sectional drawing which shows the state which started the update operation | work of the existing buried pipe. Side surface sectional drawing which shows the state which the update operation | work of the existing buried pipe advanced. Side surface sectional drawing which shows the waste_water | drain state when a lot of rainwater generate | occur | produces. Side surface sectional drawing which shows the update apparatus of the conventional existing buried pipe. Side surface sectional drawing which shows the update apparatus of the conventional existing buried pipe.

DESCRIPTION OF SYMBOLS 1 Existing buried pipe 2 Update pipe 3 Starting pit 4 Arrival mine 12 Upstream side pipe line 13 Packer 14 Submersible pump 15 Pipe 16 Downstream side pipe line 17 Packer 30 Propulsion machine 31 Tubular drive part 32 Drive motor 33 Hydraulic piston 34 Propulsion plate 40 Screw auger 41 Screw rod 42 Cutter head 43 Disc cutter 44 Shield pipe 45 Tubular casing 46 Screw blade 47 Support member 50 Drain pipe 51 Drain pipe 52 Bearing 53 Support arm 61 Drain pipe 70 Connection pipe 71 Outer pipe 72 Inner pipe 100 The apparatus for updating an existing buried pipe according to the invention

Claims (4)

While crushing the existing buried pipe by the cutter with a screw auger which advances along the existing buried pipe to reach anti from starting pit was Ho設on the ground surface, sequentially promote update pipe by propulsion unit of the start in the pit A device for updating the existing buried pipe,
A drainage pipe to be laid in the interior of the front Symbol existing buried pipe,
Bei example and a drain pump for draining the drainage pipe pumped down water flowing to the arrival downhole,
The screw auger
A tubular casing for earth removal propelled inside the renewal pipe;
A tubular screw rod that is rotationally driven by the propulsion device inside the tubular casing;
A cutter head fixed to the distal end of the tubular screw rod and rotating integrally, supporting the cutter while having a communication portion for communicating the front side and the rear side in the propulsion direction;
Extends helically around the tubular screw rod along the inner circumferential surface of said tubular casing while opening the annular gap when viewed from the axial direction between the outer peripheral surface of the inner periphery and the tubular screw rod A screw blade supported by a support member projecting from the outer peripheral surface of the tubular screw rod and rotating integrally with the tubular screw rod ;
The drain pipe has a rear end coaxially connected to a front end of the tubular screw rod,
And the propulsion device has a tubular drive unit that is coaxially connected to the rear end of the tubular screw rod and rotationally drives the tubular screw rod ,
The sewage that has flowed into the reaching mine can be drained to the start pit side via the drain pump, the drain pipe, the tubular screw rod, and the drive unit,
In addition, a large amount of rainwater that has flowed into the reaching pit is formed between the outer peripheral surface of the drain pipe and the inner peripheral surface of the existing buried pipe, and the outer peripheral surface of the tubular screw rod and the inner peripheral edge of the screw blade. An existing buried pipe renewal device, characterized in that it can be drained to the start pit side through a gap therebetween. After the propulsion device is lifted from the start pit and retracted to the ground, it further includes a connection pipe that connects the end portion on the start pit side of the tubular casing and a pipe line on the downstream side,
A large amount of rainwater that has flowed into the reaching pit is transferred to the downstream side through the existing buried pipe, the gap between the outer peripheral surface of the tubular screw rod and the inner peripheral edge of the screw blade, the tubular casing, and the connecting pipe. The renewal device for an existing buried pipe according to claim 1, wherein the pipe is configured to be drainable. A method for updating an existing buried pipe using the apparatus according to claim 1,
The drainage pipe is sequentially propelled by the propulsion unit to lay a drainage pipe inside the existing buried pipe, and the tubular screw rod is connected to the rear end of the drainage pipe and the rear end of the tubular screw rod. Connecting the drive unit,
Rotating the tubular screw rod using the propulsion device to rotate the cutter and crushing the existing buried pipe while discharging the crushed pieces to the start pit side by the screw blades,
The tubular casing and the renewal pipe are sequentially propelled using the propulsion device,
The drainage pump inflow sewage into the reach the pit, the drainage tube, as well as waste water to the starting pit side through the tubular screw rod and the driving unit,
A large amount of rainwater that has flowed into the reaching pit is between the outer peripheral surface of the drainage pipe and the inner peripheral surface of the existing buried pipe, and between the outer peripheral surface of the tubular screw rod and the inner peripheral edge of the screw blade. A method for renewing an existing buried pipe, wherein the drainage is drained to the start pit side through a gap . After retracting the ground by lifting the propulsion unit from the start in the pit,
Connecting the end of the tubular casing on the start pit side and the pipe line on the downstream side using a connecting pipe,
A large amount of rainwater that has flowed into the reaching pit is transferred to the downstream side through the existing buried pipe, the gap between the outer peripheral surface of the tubular screw rod and the inner peripheral edge of the screw blade, the tubular casing, and the connecting pipe. The method for renewing an existing buried pipe according to claim 3, wherein the pipe is drained into the pipe.

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