JPH1122379A - Existing pipe laying method and excavator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To replace an existing pipe with a new pipe while flowing a fluid, and to lay a new pipe in a state different from the state of the existing pipe. SOLUTION: A temporary pipe 6 is inserted into a replacement part 4b of an existing pipe 4 and fixed, and the fluid of an upstream part 4c flows through the temporary pipe 6 to a downstream part 4d. In this state, the propulsion device 5 is propelled using the temporary pipe 6 as a guide, and a new pipe 11 is laid while cutting and excavating the replacement section 4b to replace the new pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing an old pipe, in which a fluid such as sewerage flows, with a new pipe, and a machine for use in the method.

[0002]

2. Description of the Related Art As a method of replacing an aging existing pipe with a new pipe, for example, a first method disclosed in Japanese Patent Application Laid-Open No. 2-217591, a second method described in Japanese Patent No. 2578184, and A third method disclosed in Japanese Patent Application Laid-Open No. 2-236392 is known.

[0003] In the first construction method described above, an excavator is propelled along an existing pipe to excavate and destroy the ground and the existing pipe, and the upstream of the excavated and destroyed portion of the existing pipe is sealed, and the existing pipe is sealed. Drain the fluid flowing through the pipe through the excavator,
This is a method of laying a new pipe at the site of the destruction.

In the above-mentioned second method, an excavator is propelled along an existing pipe to excavate and destroy the ground and the existing pipe.
This is a method of laying a new pipe at the site of the destruction.

[0005] In the above-mentioned third method, an excavator is propelled from a starting shaft toward a reaching shaft by a propulsion jack to cut an existing pipe, and a new stroke is provided between the excavator and the propulsion jack every time a predetermined stroke is cut. In this method, existing pipes are replaced with new pipes by adding pipes and propelling to the arrival shaft.

[0006]

According to the first method,
Since the fluid flowing through the existing pipe is drained through the inside of the propulsion device, the pipe can be replaced with a new pipe while flowing the fluid through the existing pipe.
For example, an old sewage pipe can be replaced with a new pipe while flowing sewage through the sewage pipe.

However, in the first method, the preceding wall of the excavator is fitted to the existing pipe to make the upstream and downstream watertight,
Since the fluid on the upstream side is drained to the downstream side through the inside of the preceding wall body and the cylindrical body, it is difficult to ensure watertightness between the preceding wall body and the existing pipe inner surface. Fluid may leak from between and flow into the excavator.

If a fluid flows into the excavator, it may be difficult to lay a new pipe following the excavator.

In particular, when the existing pipe is a sewer made of reinforced concrete, it is difficult to make sure that the inner surface of the sewer has irregularities or cracks, and that the inner wall of the sewer is tightly sealed with the preceding wall.

Further, since the excavator guides the preceding wall body and propels it along the existing pipe, the new pipe is laid as if the existing pipe was buried. For this reason, if the existing pipe is curved due to earth pressure due to long-term use, a new pipe is laid in the curved state, and the new pipe is laid in the correct state by correcting the curvature of the existing pipe. Can not.

[0011] In the above-mentioned second method, it is impossible to flow a fluid when replacing an existing pipe. For this reason, when the sewer pipe is replaced, the sewage cannot flow into the sewer pipe on the upstream side of the section to be replaced.

Further, since the excavator cuts the existing pipe while propelling the existing pipe as a guide, the new pipe is laid as the existing pipe is buried, as in the first method.
A new pipe cannot be laid in the correct state by correcting the curvature of the existing pipe.

In the third method described above, fluid cannot flow through the existing pipe between the starting shaft and the reaching shaft. For this reason, when replacing a sewer pipe, sewage cannot be made to flow to the sewer pipe upstream of the reaching shaft.

It is an object of the present invention to provide an existing pipe laying method and an excavator capable of solving the above-mentioned problems.

[0015]

According to the first aspect of the present invention, a temporary pipe 6 is laid inside an existing pipe 4 and the laid temporary pipe 6 is fixed, and then the temporary pipe 6 is used as a guide. This is a method of replacing existing pipes, characterized in that the excavator 5 is propelled to cut and excavate the existing pipe 4, and then a new pipe 11 is installed from the rear of the excavator 5.

According to the first aspect of the present invention, the temporary pipe 6 connects the upstream section 4c and the downstream section 4d of the existing pipe 4 with respect to the section 4b to be replaced, and the upstream section 4c and the downstream section 4c.
Fluid circulates through the temporary pipe 6 to d.

Thus, it is possible to replace the pipe with a new pipe while flowing the fluid through the existing pipe. For this reason, the sewage pipe can be replaced while the sewage flows into the sewage pipe on the upstream side of the replacement section.

Further, since the fluid flows through the temporary pipe 6 to the upstream portion 4c and the downstream portion 4d of the existing pipe 4, the replacement of the existing pipe 4 can be performed regardless of the inner surface of the existing pipe 4. No fluid leaks into the part 4b.

Thus, the work of laying a new pipe becomes easier.

The temporary pipe 6 laid inside the existing pipe 4
When the excavator 5 is propelled along, the center of the temporary pipe 6 is slightly displaced with respect to the center of the existing pipe 4 to lay the new pipe in a state slightly different from the state where the existing pipe 4 is buried. 1
1 can be laid.

Thus, the curvature of the existing pipe 4 due to earth pressure or the like can be corrected and a new pipe can be laid in a correct state.

The second invention is a method of replacing the existing pipe in which the filler 9 is filled between the existing pipe 4 and the temporary pipe 6 to fix the temporary pipe 6 in the first invention.

According to the second invention, the existing pipe 4 and the temporary pipe 8
When the existing pipe 4 made of reinforced concrete is cut or excavated, the concrete is cut and a part of the rebar is exposed. However, a part of the exposed rebar is held by the filler 9 and does not largely move inward.

This makes it easier to cut the reinforcing bar with the excavator 5.

According to the third aspect of the present invention, an excavator body 20 having a cutter head 26 having a temporary pipe through hole 29 at the center, and the excavator body 20 attached to the excavator body 20 along the temporary pipe 6 are provided. A guiding device for guiding, the excavator body 20
The excavator is provided with an earth removal device configured to discharge the material cut and excavated by the cutter head 26.

According to the third invention, the excavator is inserted into the temporary pipe 6 by penetrating the temporary pipe 6 into the temporary pipe through hole 29 and guiding the excavator body 20 along the temporary pipe 6 by the guide device. It is propelled correctly as planned, and the cut and excavated material is discharged backward by the earth removal device.

Thus, after the temporary pipe 6 is laid in the existing pipe 4 and fixed, it is propelled along the temporary pipe 6 to be suitable as an excavator for cutting and excavating the existing pipe 4.

The fourth invention is an excavator in which the front surface of the cutter head 26 according to the third invention has a funnel shape in which an outer peripheral portion projects forward from an inner peripheral portion.

According to the fourth aspect, the material cut and excavated by the cutter head 26 is directed to the center without diffusing to the outside of the cutter head 26.

Thus, when the existing pipe 4 is cut and excavated, the cut and excavated material is directed toward the inside of the existing pipe 4, so that the object buried outside the existing pipe 4 is adversely affected. There is no.

According to a fifth aspect of the present invention, the excavator main body 20 according to the third aspect of the present invention is an articulate type capable of swinging up and down, left and right, and is capable of changing the excavating direction. This is an excavator provided with an adjustment mechanism for relative displacement.

According to the fifth aspect of the present invention, when the excavator body 20 is swung up and down and left and right to change the excavation direction, the guide mechanism is adjusted to follow the excavator body 20 in the radial direction by the adjusting mechanism. Then, the guide device is relatively displaced in accordance with the direction of the propulsion direction of the excavator body 20.

Thus, when the guide device is propelled while being guided along the temporary pipe 6, it can be adjusted in accordance with the propulsion direction.

According to a sixth aspect of the present invention, in the third aspect, a screw conveyor 40 in which an inner cylinder 43 provided with a screw 42 is inserted into an outer cylinder 41 is used as a soil discharging device. Screw conveyor 4 so that it can be inserted
The excavator according to claim 3, wherein 0 is a guide device.

According to the sixth aspect of the present invention, since the screw discharging device 40 and the guiding device are shared by the screw conveyor 40, the structure is simplified.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION

(Construction method of replacing existing pipes with new pipes) As shown in FIG. 1 (a), a first shaft 2 and a second shaft 3 are formed on the ground 1, and a part 4a of the existing pipe 4 is converted into a first shaft. 2 shafts, 2 shafts
Exposure to The portion 4b between the first shaft 2 and the second shaft 3 is replaced.

As shown in FIG. 1B, the first pipe 4
The portions 4a exposed to the shaft 2 and the second shaft 3 are cut and removed.

As shown in FIG. 1 (c), an excavator 5 is provided in the first shaft 2 and a replacement part 4b of the existing pipe 4 is provided.
, A temporary pipe 6 is inserted into the pipe, and positioned and supported by a concrete support 7. One end of the temporary pipe 6 protrudes through an upstream portion 4c of the existing pipe 4 via a sealing material (lid) 8, and the other end of the temporary pipe 6 penetrates the excavator 5 to a downstream portion of the existing pipe 4. 4d protrudes through the sealing material (lid) 8.

By doing so, the fluid such as sewage flowing into the upstream portion 4c of the existing pipe 4 flows through the temporary pipe 6 to the downstream portion 4d of the existing pipe 4, and A fluid can be flowed when the replacement section 4b is replaced with a new pipe.

As shown in FIG. 1C, when the insertion of the temporary pipe 6 is completed, the filler 9 such as mortar is filled between the replacement part 4b of the existing pipe 4 and the temporary pipe 6, and the temporary pipe 5 is filled. Position and fix.

As shown in FIG. 1 (d), the excavator 5 excavates and cuts the replacement portion 4b, the filler 9 and the ground 1 of the existing pipe 4 and directs it toward the second shaft 3 with the temporary pipe 6 as a guide. A new pipe 11 is laid in the dug portion 10.

As shown in FIG. 1 (e), the excavation is carried out to the second shaft 3 so that the replacement part 4b of the existing pipe 4 is entirely replaced with the new pipe 11.
When the replacement of the existing pipe 4 is completed, the new pipe 11 and the downstream portion 4d of the existing pipe 4 are connected to each other by the connecting pipe at the first shaft 2, and the excavator 5 is lifted from the second shaft 3 to the ground, and The temporary pipe 6 is removed while the upstream pipe 4c and the new pipe 11 are connected by a connecting pipe.

In the above description, the construction method in which only the portion 4b of a predetermined length in the middle of the existing pipe 4 is replaced with a new pipe has been described. When the state becomes 1 (e), the third shaft may be excavated upstream and the operation after FIG. 1 (b) may be repeated.

(Structure of the excavator) As shown in FIGS. 2 and 3, the excavator main body 20 includes a cylindrical front main body 21, a cylindrical intermediate main body 22, and a cylindrical rear main body 23. The front body 21 and the middle body 22 are connected to the articulated jack 2.
4, it is swingable up and down, left and right, and a propulsion jack 25 is attached to the intermediate body 22 and the rear body 23. Thus, an articulated excavator body is formed.

A cutter head 26 is mounted on the front main body 21, and the cutter head 26 is driven to rotate by a motor 27. The front plate 28 of the cutter head 26 has a funnel shape in which the outer peripheral portion protrudes forward from the center, and a temporary pipe through hole 29 is formed at the center of rotation of the front plate 28.

The above-mentioned temporary pipe 6 penetrates through the temporary pipe through hole 29. The above-mentioned existing pipe 4 is made of substantially trapezoidal reinforced concrete.
Of the existing pipe 4
In addition, the ground 1 and the filler 9 can be excavated.

A disk cutter 30 and a gear cutter 31 are mounted on a front plate 28 of the cutter head 26. By rotating the cutter head 26, the disk cutter 3 is rotated.
At 0, the existing pipe 4 made of reinforced concrete is cut and excavated, and the gear cutter 31 cuts and excavates the reinforcing steel in the circumferential direction of the face.

A wire brush type tail seal 32 is attached to the rear main body 23, and a link type segment erector 33 is mounted to the intermediate main body 22.

A screw conveyor 40 forming an earth discharging device is mounted inside the excavator body 20. In the screw conveyor 40, an inner cylinder 43 having a screw 42 is rotatably inserted into an outer cylinder 41. A bracket 44 fixed to the outer cylinder 41 is connected to a reaction force receiver 45 fixed to the intermediate portion main body 22 by a pin 46 and an elongated hole 47 in a radial direction. , And is supported so as to be relatively displaceable in the radial direction.

The front portion of the outer cylinder 41 is supported by the front body 21 via a cushioning material 48 such as rubber or a spring so as to be relatively displaceable in the radial direction. As shown in FIG. 4, four attitude control jacks 49 are attached at equal intervals in the rotation direction.

The guide roller 5 is located near the rear of the outer cylinder 41.
0 is attached. This guide roller 50 contacts the outer surface of the temporary pipe 6. The space between the inner cylinder 43 and the temporary pipe 6 is sealed with a water-stop sealing material 51.

A screw conveyor motor 52 is mounted near the rear of the outer cylinder 41, and the output side of the motor 52 is connected to the inner cylinder 43 by a pinion, a ring gear or the like.
By driving the motor 52, the inner cylinder 43 is
Rotated with. 53 is a segment.

As shown in FIG. 5, a discharge port 54 is provided near the rear of the outer cylinder 41, and a belt conveyor 55 is provided below the discharge port 54. An input port 56 is provided at the front end of the outer cylinder 41.

Next, the excavating operation will be described. By extending and retracting the propulsion jack 25, the machine 20 protrudes along the temporary pipe 6 with the guide roller 50 and the inner cylinder 43 attached to the outer cylinder 41 of the screw conveyor 40 as guides. That is, the screw conveyor 40 forms a guide device.

While propelled as described above, the cutter head 2
By rotating 6, the concrete wall and the reinforcing bar of the existing pipe 4 are cut, and the surroundings of the filler 9 and the existing pipe 4 of the ground 1 are excavated.

Cutting pieces (concrete pieces, reinforcing bar pieces) and excavated scraps (earth and sand, filler pieces) of the existing pipe 4 are charged from the input port 56 between the outer cylinder 41 and the inner cylinder 43 of the screw conveyor 40, and are screwed. The paper is conveyed rearward by the rotation of the roller 42, falls onto the belt conveyor 55 from the discharge port 54, and is discharged rearward by the belt conveyor 55.

Since the front plate 28 of the cutter head 26 has a funnel shape in which the outer peripheral portion protrudes forward from the central portion, the cut pieces and excavated chips of the existing pipe 4 do not diffuse outside the existing pipe 4. Turn inward. As a result, other buried objects buried in the outer circumference of the existing pipe 4 are not adversely affected.

The filler 9 near the outer peripheral surface of the temporary pipe 6 is excavated by a bit 57 attached to the periphery of the temporary pipe through hole 29 of the cutter head 26.

The outer cylinder 41 of the screw conveyor 40 constituting the guide device is supported on the outer peripheral surface of the temporary pipe 6 by a guide roller 50, and the outer cylinder 41 is radially displaceable with respect to the intermediate body 22. The screw conveyor 40 can be displaced radially relative to the excavator body 20 by expanding and contracting the attitude control jack 49 because the cushion member 48 can be displaced in any direction with respect to the front body 21.

That is, an adjusting mechanism for radially displacing the screw conveyor 40 (guide device) by the attitude control jack 49 or the like is provided.

As described above, the screw conveyor 40 is moved when the excavation direction is changed along the temporary pipe 6 by extending and contracting the articulated jack 24 and swinging the front body 21 up and down and left and right. By displacing the screw conveyor 40 relative to the screw 21, the screw conveyor 40 can always be correctly aligned with the temporary pipe 6.

That is, since there is a large radial space between the temporary pipe 6 and the machine body 20, the machine body 2
0 can be largely displaced in the vertical and horizontal directions with respect to the temporary pipe 6. However, since the radial space between the temporary pipe 6 and the inner cylinder 43 of the screw conveyor 40 is small, the excavator as described above is used. When the body 20 is displaced up and down and left and right to change the direction of the excavation direction, the screw conveyor 40 is displaced up and down and left and right relative to the excavator body 20 so that the direction of the propulsion direction is different from that of the excavator body 20. So that the inner tube 43 and the temporary pipe 6 do not interfere with each other.

When the predetermined stroke is excavated as described above, the segment 53 is wound up to form a new pipe 11.

Next, a description will be given of a second embodiment of the excavator. As shown in FIG. 6, the excavator body 20 and the cutter head 26 are the same in the first embodiment, and the discharging device is a belt conveyor 60. The belt conveyor 60 is mounted at a position shifted from the center of the excavator body 20 so as not to interfere with the temporary pipe 6. Cutter head 26
The excavated and cut pieces and cut pieces are dropped on the belt conveyor 60 by the chute 61 as shown in FIG.

A guide device 62 is mounted on the intermediate body 22. The guide device 62 has four guide rollers 64 mounted on a ring-shaped frame 63 radially with respect to the center of the temporary pipe 6 as shown in FIG.

The guide roller 64 can be advanced and retracted toward the center of the temporary pipe 6 by the cylinder 65, thereby constituting an adjusting mechanism.

Next, a description will be given of a third embodiment of the excavator. As shown in FIGS. 9 and 10, the excavator body 20 has the same shape as that of each of the above-described embodiments, and the cutter head 26 is formed by an outer cutter head 70 and an inner cutter head 71.

The outer cutter head 70 is rotated by a motor 72 for the outer cutter head. The front plate 73 has a funnel shape in which the outer peripheral portion projects forward from the inner peripheral portion. The disk cutter 30 is mounted on the front plate 73. is there. The inner peripheral cutter head 71 is a cylindrical body, the inner peripheral surface of which is a temporary pipe through-hole 29, and is rotated in a direction opposite to the outer peripheral cutter head 71 by an inner peripheral cutter head motor 74. A bit 75 for cutting the filler 9 is attached to the front end of the inner peripheral cutter head 71.

The inner cutter head 71 projects forward from the center hole 76 of the outer cutter head 71, and a tapered cylindrical body 77 is fixed to the center hole 76 of the outer cutter head 71. A V-shaped space is formed between the outer peripheral surface of the inner cutter head 71 and the outer peripheral surface of the inner peripheral cutter head 71, and crusher teeth 78 are fixed to the outer peripheral surface and the cylindrical body 77 to form a face crusher 79.

As described above, the cut pieces of the existing pipe 4 and the excavated pieces of the filler 9 are crushed by the face crusher 79,
The crushed pieces enter the cutter head internal space 80.

The cutter head internal space 80 is made watertight with other parts by a muddy water sealing material 81 or the like, and a mud feeding pipe 82 and a mud discharging pipe 83 protrude. An in-machine crusher 84 is provided in the middle of the exhaust pipe 83.

As described above, the inside of the cutter head internal space 80 is pressurized by the muddy water fed by the muddy pipe 82, and the crushed pieces inputted are discharged by the muddy pipe 83 together with the muddy water.
The crushed pieces discharged from the sludge pipe 83 are crushed smaller by the in-machine crusher 84 and then discharged from the sludge pipe 83.

As a result, the concrete piece and the reinforcing bar piece are crushed smaller by the face crusher 79 and the in-machine crusher 84, so that the soil discharging device can be of a muddy water discharging type.

Also in this case, the guide device 6
2 is attached.

The above excavator is of a type in which the excavator body 20 is divided into a plurality of parts and propelled by the propulsion jacks 25.
Excavator body 2 using the thrust of a separate propulsion cylinder
A type that promotes 0 may be used.

For example, as shown in FIG.
A spacer tube 90 is connected to the rear body 2 as the rear body 23, and the spacer tube 90 is propelled by a propulsion jack through a propulsion tube 91. In this case, the propulsion pipe 91 is the new pipe 11
Becomes

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram of a process sequence showing an embodiment of a replacement method according to the present invention.

FIG. 2 is a sectional view showing a first embodiment of the excavator.

FIG. 3 is a front view of the cutter head.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a sectional view taken along line BB of FIG. 2;

FIG. 6 is a sectional view showing a second embodiment of the excavator.

FIG. 7 is a sectional view taken along the line CC of FIG. 6;

FIG. 8 is a sectional view taken along the line DD of FIG. 6;

FIG. 9 is a sectional view showing a third embodiment of the excavator.

FIG. 10 is a front view of the cutter head.

FIG. 11 is a sectional view showing a fourth embodiment of an excavator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ground 2 ... 1st shaft 3 ... 2nd shaft 4 ... Existing pipe 4a ... Part 4b ... Replacement part 4c ... Upstream part 4d ... Downstream part 5 ... Drilling machine 6 ... Temporary pipe 7 ... Support stand 8 ... Seal material 9 ... Filling material 10 ... Drilled part 11 ... New tube 20 ... Excavator body 21 ... Front body 22 ... Intermediate body 23 ... Rear body 24 ... Articulated jack 25 ... Propulsion jack 26 ... Cutter head 27 ... Motor 28 Front plate 29 Temporary pipe through hole 30 Disc cutter 31 Gear cutter 32 Tail seal 33 Segment elector 40 Screw conveyor 41 Outer cylinder 42 Screw 43 ... Inner cylinder 44 Bracket 45 Reaction force receiver 46 ... Pin 47 ... Long hole 48 ... Buffer material 49 ... Position control jack 50 ... Guide roller 51 ... Waterproof sealing material 52 ... Motor 53 ... Segume G 54 ... outlet 55 ... belt conveyor 56 ... inlet 60 ... belt conveyor 61 ... chute 62 ... guide device 63 ... ring-shaped frame 64 ... guide roller 65 ... cylinder 70 ... outer peripheral cutter head 71 ... inner peripheral cutter head 72 ... outer periphery Cutter head motor 73 ... Front plate 74 ... Inner peripheral cutter head motor 75 ... Bit 76 ... Center hole 77 ... Cylinder 78 ... Crusher tooth 79 ... Cut face crusher 80 ... Cutter head inner space 81 ... Muddy water sealing material 82 ... Muddy Pipe 83: Drainage pipe 84: In-machine crusher 90: Spacer pipe 91: Propulsion pipe

Claims (6)

[Claims] 1. A temporary pipe (6) is laid inside an existing pipe (4), and after fixing the laid temporary pipe (6), the excavator (5) is guided by the temporary pipe (6). A method of replacing existing pipes, comprising cutting and excavating the existing pipe (4) by propulsion, and then laying a new pipe (11) from the rear of the excavator (5). 2. The temporary pipe (6) is fixed by filling a filler (9) between the existing pipe (4) and the temporary pipe (6).
Replacement method of existing pipes described. 3. An excavator body (20) provided with a cutter head (26) having a temporary pipe through-hole (29) at the center, and attached to the excavator body (20) and along the temporary pipe (6). A guiding device for guiding the excavator body (20), and a cutter head (26) provided in the excavator body (20).
An excavator characterized by comprising an earth removal device for discharging the material cut and excavated in the above. 4. The excavator according to claim 3, wherein the front surface of the cutter head (26) has a funnel shape in which an outer peripheral portion projects forward from an inner peripheral portion. 5. The excavator body (20) is an articulate type capable of swinging up and down and left and right so that the excavation direction can be changed, and the guide device is adjusted to be displaced in the radial direction relative to the excavator body (20). The machine according to claim 3, further comprising a mechanism. 6. A screw conveyor (4) in which an inner cylinder (43) having a screw (42) is inserted into an outer cylinder (41).
0) is an earth removal device, and the screw conveyor (4) is inserted so that the temporary pipe (6) is inserted into the inner cylinder (43).
The excavator according to claim 3, wherein 0) is a guide device.