JPH11201370A - Underground sewer repairing method and repairing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repairing method and a repairing device by which a deteriorated underground sewer can be repaired without stopping flow of water or water and solid objects. SOLUTION: In an underground sewer repairing method, the upstream and the downstream of the part to be repaired in the underground sewer 10 are closed by means of temporarily cut-off means 30, 54, and at the same time, a pipe 12 is passed over the closed section so as to pass water or water and solid objects from the upstream to the downstream via the pipe 12. While water or water and solid objects are passed through the pipe 12, a chipping machine 14 is brought to the predetermined axis directional position of the pipe 12, and the chipping machine 14 is moved around the pipe 12 so as to chip the inner circumferential edge of the underground sewer 10. Subsequently, the chipping machine 14 is shifted by a predetermined distance in the axial direction of the pipe 12, and then, shift of the chipping machine 14 around the pipe 12 and chipping of the inner circumferential edge of the underground sewer 10 are repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing an underground pipe and a device used for the repair, and is particularly effective when the underground pipe is a concrete buried pipe for sewage having a circular cross section. The present invention relates to a repair method and a repair device.

[0002]

2. Description of the Related Art For example, a concrete buried pipe for sewage is exposed to an atmosphere containing a gas such as hydrogen sulfide which promotes deterioration of concrete during operation, so that the inner peripheral edge thereof deteriorates over time. . Therefore, it is necessary to repair the deteriorated concrete buried pipe without stopping the flow of sewage.

[0003] A pipeline repairing device which is detachably disposed in a pipeline and has two weirs shutting off an upstream side and a downstream side, and a hose passed between these weirs (Japanese Patent Laid-Open No. Sho 57-57). 171195
According to Japanese Patent Application Laid-Open Publication No. H11-260, it is possible to repair the pipeline without stopping the flow of sewage.

[0004]

The above-mentioned repair device is mainly intended to shut off a leaking pipe portion by two weirs and to flow sewage through a hose to repair the leaking portion. There is no mention of repairing pipelines that have deteriorated over time.

[0005] The present invention provides a repair method and a repair apparatus that can repair a deteriorated underground pipe without stopping the flow of water or water and solids.

[0006]

The method for repairing underground pipes according to the present invention is characterized in that the upstream and downstream sides of the portion of the underground pipes to be repaired are closed, and the section of the underground pipe that is to be repaired is closed. Flowing water or water and solids from the upstream side to the downstream side through the pipe across the pipe, and bringing a suspender to a predetermined position in the axial direction of the pipe while flowing water or water and solids through the pipe; A lifting machine is moved around the pipe to remove the inner periphery of the underground pipe. Thereafter, the lifting machine is moved a predetermined distance in the axial direction of the pipe, and the lifting machine is moved around the pipe to repeat the inner peripheral edge of the underground pipe.

[0007] After closing the upstream and downstream sides of the portion to be repaired, the lifting machine is moved around the pipe to peel off the inner periphery of the underground pipe to remove the deteriorated portion.

[0008] Since the degraded portion of the underground pipe is actively removed by using a lifting machine, the degraded portion collapses, thereby preventing the flow of the underground pipe from being interrupted. Can be prevented.

After the inner peripheral edge of the underground pipe is removed, it is preferable to attach an anticorrosion sheet to the exposed underground pipe.

[0010] The anticorrosion sheet is stuck to the exposed underground pipes to prolong the life of the underground pipes and greatly extend the service period.

The deteriorated portion may reach a depth of 2 to 10 cm depending on the service period, but the thickness of the anticorrosion sheet is about 2 mm. Therefore, the effective cross-sectional area of the underground pipe after peeling and attaching the anticorrosion sheet is greatly increased as compared with that before peeling, and the flow rate can be increased. Since the deteriorated portion does not substantially contribute to the strength of the underground pipe, there is no problem even if the deteriorated portion is removed. In other words, since the underground pipe is designed on the assumption that deterioration over a certain range occurs, a decrease in strength due to deterioration within the above range is expected from the beginning. For this reason, it can be said that the increase in the effective cross-sectional area due to hanging is not a process that sacrifices the strength of the underground pipe.

[0012] It is preferable that a formwork is disposed inside the underground pipe to support the anticorrosion sheet.

The anticorrosion sheet is made of, for example, polyethylene having a thickness of about 2 mm, and is carried into the site as a roll. By supporting the anticorrosion sheet in an attached state using a mold, the anticorrosion sheet can be easily adhered to the exposed underground pipe.

In the case where the anticorrosion sheet is not attached to the exposed underground pipe, the inner periphery of the underground pipe is removed, and then an interval is provided inward from the exposed underground pipe. It is preferable to arrange a mold and inject mortar into the space.

[0015] The mortar is attached to the exposed underground pipes to prolong the life of the underground pipes and extend the service period.

It is further preferred that an anticorrosion sheet is attached to the inner periphery of the mortar.

Since ordinary mortar has little anticorrosion action, the service period can be greatly extended by anticorrosion with an anticorrosion sheet.

When closing the underground pipe, the upstream side of the underground pipe can be closed over the entire cross-section, and at least the portion below the free surface of water on the downstream side can be closed.

On the upstream side, the entire cross section is closed in order to cope with fluctuations in the water level. On the downstream side, the lower part of the cross section of the underground pipe is closed to the extent that backflow does not occur from the downstream cutoff point. As a result, it is possible to carry out the work of a worker at the cut-off point on the downstream side, carry in / out of materials or equipment, carry out hanging chips, and the like.

The present invention also relates to a device for repairing underground pipes. The first temporary closing means is attached to the outer periphery of the upstream end of the pipe, and the second temporary closing means is attached to the outer peripheral portion of the pipe downstream of the temporary closing means. Further, a third temporary closing means is attached to the outer periphery of the downstream end of the pipe, and a fourth temporary closing means is attached to an outer peripheral portion of the pipe upstream of the third temporary closing means. At least two sets of fixing means are attached to the pipe at intervals in the axial direction of the pipe. Each fixing means has a first support that is movable in the axial direction of the pipe and can be fixed, and a second support that is fixed to the pipe, and these supports can expand and contract in the radial direction. It is. A lifting machine is arranged to be rotatable about the pipe and to be movable in the axial direction of the pipe. The first to fourth temporary closing means have a bag body which can be expanded and contracted in a radial direction, and one of the first temporary closing means and the second temporary closing means and the third temporary closing means. One of the closing means and the fourth temporary closing means is movable relative to the pipe in the axial direction.

Since the first to fourth temporary closing means have a bag body which can be expanded and contracted in the radial direction, when the bag body is inflated, the temporary closing means comes into close contact with the pipe and the underground pipe. , Close the underground pipe.

Each fixing means has a first support which is movable and can be fixed in the axial direction of the pipe, and a second support which is fixed to the pipe, and these supports are provided in the radial direction. The first temporary closing means and the second
One of the temporary closing means and one of the third and fourth temporary closing means are axially movable relative to the pipe, and the first to fourth temporary closing means are radially movable. Since the bag has an inflatable and contractible bag body, the entire repair device can be moved in the axial direction of the underground pipe with the underground pipe closed. As a result, after the dropping of one place by the repair device is completed, the repair device can be moved and the next portion can be dropped.

It is preferable that the temporary closing means, which is movable relative to the pipe, has a sealing material on an inner peripheral edge facing the pipe.

When the repair device is to be moved, first, the temporary closing means which can be moved relative to the pipe is moved, and then the pipe is moved with respect to the temporary closing means.
When the pipe is moved, the sealing material can prevent water from entering the closed position.

It is preferable to provide a formwork attached to the pipe and capable of being deformed to a radially outwardly enlarged position and an inwardly reduced position.

The anticorrosion sheet can be held at a predetermined position or mortar can be injected by the mold.

The first temporary closing means and the second temporary closing means are formed so as to close all cross sections of the underground pipe, and the third temporary closing means and the fourth temporary closing means are provided. May be formed to shut off at least a portion below the free surface of water.

On the upstream side, the entire section is cut off to cope with fluctuations in the water level, but on the downstream side, the lower part of the section of the underground pipe is cut off to the extent that backflow from the cutoff point on the downstream side does not occur. Since each temporary closing means is formed in the apparatus, workers can enter and exit through the temporary closing means on the downstream side, carry in and out materials and equipment, carry out hanging chips, and the like.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 which is a sectional view, a method of repairing an underground pipe is shown in FIG. Water or water and solids are passed from the upstream side A to the downstream side B through the pipe 12 by passing the pipe 12 through the section. The underground pipe 10 is made of concrete.

The underground pipe 10 generally has a distance of 1 to 1.5 km.
Each time, a hole called a human hole is formed from the road surface, and a plurality of holes called a manhole and having a smaller diameter than the human hole are formed between the human holes from the road surface. When the upstream side A and the downstream side B are closed, for example, the upstream side of the upstream manhole and the downstream side of the downstream manhole can be closed, or the manhole can be closed. In the former case, the worker can get in and out of the place C where the worker has closed through a human hole or a manhole, so that all cross sections on the upstream side and the downstream side of the underground pipe 10 can be closed. On the other hand, in the case of closing between the manholes as in the latter case, if all the cross sections on the upstream side and the downstream side of the underground pipe 10 are closed, the worker cannot enter or leave the closed point C. Therefore, on the downstream side B, at least a portion below the free surface of water is closed.

While the water or water and solids are flowing through the pipe 12, the lifting machine 14 is brought to a predetermined position in the axial direction of the pipe 12, and the lifting machine 14 is moved around the pipe 12 to move the water into the underground pipe 10. Remove the peripheral edge 11. Preferably, a stirrer or sewage pump 16 is placed at the inlet of the pipe 12 on the upstream side so that solids do not settle at the inlet of the pipe 12.

When the span from the upstream cut-off to the downstream cut-off is short, the pipe 12 is a steel pipe. When the span is long, the pipe 12 is a lifting machine 14 or a steel pipe at a location with a form described later. Can be a flexible pipe. The lifting machine 14 has a tip at the tip. The tip is operated by a rotary type, a beating type, a high-pressure water type, a hydraulic type or the like to crush the inner peripheral edge 11 of the underground pipe 10 and is attached to a telescopic arm, and over a certain thickness. Can be hung. The crushed fragments may be in the form of small particles or blocks.

After the single lifting operation is completed by the movement of the lifting device 14 around the pipe 12, the lifting device 14
A predetermined distance in the axial direction of the pipe,
The lifting machine 14 is moved around the pipe 12 by the width that can be pulled at one time, and the underground pipe 10 is moved around the pipe 12.
Is repeated.

After peeling the inner peripheral edge 11 of the underground pipe 10, it is preferable to attach an anticorrosion sheet 20 to the exposed portion 18 of the underground pipe. In FIG. 1, for convenience of explanation, the stripped and exposed portion 18 is indicated by a dotted line, and the anticorrosion sheet 20 is indicated by a solid line. Anticorrosion sheet 2
Numeral 0 is a plastic sheet having a thickness of about 2 mm, such as polyethylene, which is not corroded by hydrogen sulfide, acid, or the like, and preferably has a large number of projections on the back surface. The anticorrosion sheet 20 is delivered as a roll having a certain width. The exposed portion 18 of the underground pipe 10
It is preferable that the exposed portion 18 be cut into, for example, a quarter of the circumferential length of the exposed portion 18 and transported to the site using the carriage 22 for convenience of attachment. The anticorrosion sheet 20 has a portion 18 where the projection on the back surface is exposed.
And glued to the exposed portion 18 by an adhesive or by mortar. After pasting the anticorrosion sheet 20 in the circumferential direction, it is further pasted in the circumferential direction at an adjacent part in the axial direction, and this is repeated.

The anticorrosion sheet 20 can be supported by disposing the formwork 24 inside the underground pipe 10. The formwork 24 includes a support member 26 and a face plate 27, and is deformable between a radially outwardly enlarged position and an inwardly reduced position. Formwork 24
Is in the enlarged position, the face plate 27 contacts the anticorrosion sheet 20 and holds the anticorrosion sheet 20 so as not to peel off from the exposed portion 18 until the adhesive strength of the anticorrosion sheet 20 is developed.

After the inner peripheral edge 11 of the underground pipe 10 has been peeled off, a formwork is arranged at an interval inward from the stripped and exposed section 18 of the underground pipe, and mortar is placed within the interval. It can also be injected. The mold in this case can be formed by a support material and a face plate similarly to the mold frame 24, but a hollow portion is provided in a part of the support material, and furthermore, it protrudes radially outward at both axial ends of the face plate. Set up a flange. The hollow portion is opened on the back side of the face plate and on the inner side of the face plate, and mortar is injected into the space from the inner side.

Further, an anticorrosion sheet may be attached to the inner periphery of the mortar. Attachment of the anticorrosion sheet can be performed as described above.

An apparatus used for repairing an underground pipe includes a pipe 12. In the embodiment shown in FIG.
Is a cylindrical steel pipe.

The first temporary cutoff means 30 is attached to the outer periphery of the upstream end of the pipe 12. Referring to FIG. 2 showing a sectional state, the first temporary cutoff means 30 has a bag body 32 which can be expanded and contracted in the radial direction, and a partition plate 34 arranged outside the pipe 12. The partition plate 34 is made of a steel plate and formed in an annular shape, and has strength enough to withstand the water pressure when the underground pipe 10 is closed. Partition plate 34
Is held between two slip stoppers 36 each having a circular angle material, and the slip stopper 36 is welded to the pipe 12. Further, the fall prevention support material 38 is provided between the partition plate 34 and the pipe 12.
And is welded to. The bag 32 is attached to the outer periphery of the partition plate 34, and expands by supplying compressed air to a valve (not shown). When the bag body 32 is inflated, the bag body 32 comes into close contact with the inner peripheral surface of the underground pipe 10, and exhibits a shutoff function. A monitoring window 39 can be provided in the partition plate 34.

The second temporary closing means 40 is attached to an outer peripheral portion of the pipe 12 downstream of the temporary closing means 30. Referring to FIG. 3 showing a sectional state, the second temporary closing means 40 includes a bag body 42 which can be expanded and contracted in a radial direction,
A partition plate 44 disposed outside the pipe 12. The partition plate 44 is made of a steel plate and formed in an annular shape, and has strength enough to withstand the water pressure when the underground pipe 10 is closed. The partition plate 44 is sandwiched between two slip stoppers 46 each having a circular angle material, and the slip stopper 46 is welded to a cylindrical slider 48. The slider 48 is disposed outside the pipe 12 with two sealing members 50 interposed therebetween, and is movable relative to the pipe 12 in the axial direction. That is, the slider 48 can move with respect to the pipe 12, and the pipe 12 can move with respect to the slider 48. Further, the fall prevention support member 52 is provided with the partition plate 44 and the slider 48.
And is welded to. The bag body 42 is attached to the outer periphery of the partition plate 44, and expands by supplying compressed air to a valve (not shown). When the bag body 42 is inflated, the bag body 42 comes into close contact with the inner peripheral surface of the underground pipe 10, and exhibits a closing function. A monitoring window 53 can be provided on the partition plate 44.

The third temporary closing means 54 is attached to the outer periphery of the downstream end of the pipe 12. The third temporary cut-off means 54 may have substantially the same structure as the first temporary cut-off means 30 if there is a manhole or manhole in the span from the upstream cut-off to the downstream cut-off. it can. FIG.
In the embodiment shown in (3), the span from the upstream cutoff to the downstream cutoff is short, and it is assumed that no manhole or manhole exists in this span. This is a structure corresponding to the lower half of the second temporary closing means 40. That is, it has a semicircular bag body 56 which can be expanded and contracted in the radial direction, and a semicircular partition plate 58 arranged in the lower half outside the pipe 12. Partition plate 58
Is movable relative to the pipe 12 in the axial direction, similarly to the partition plate 44 of the second temporary closing means 40. The bag body 56 is attached to the outer periphery of the partition plate 58. When compressed air is supplied to the bag body 56, the bag body 56 expands and comes into contact with the lower half of the inner peripheral surface of the underground pipe 10, thereby exhibiting a shutoff function. When the free surface of the water downstream of the third temporary cutoff means 54 is higher than the central level of the underground pipe 10, the upper end of the partition plate is raised upward to prevent the backflow of water.

The fourth temporary closing means 60 is attached to an outer peripheral portion of the pipe 12 on the upstream side of the third temporary closing means 54. The fourth temporary cut-off means 60 may have substantially the same structure as the second temporary cut-off means 40 if there is a manhole or manhole in the span from the upstream cut-off to the downstream cut-off. it can. In the embodiment shown in FIG. 1, the span from the upstream cutoff to the downstream cutoff is short, and it is assumed that no manhole or manhole exists in this span. Is a structure corresponding to the lower half of the first temporary closing means 30. That is, the semicircular bag body 62 which can be expanded and contracted in the radial direction, and the pipe 1
2 and a semi-circular partition plate 64 disposed in the lower half outside of the partition 2. The partition plate 64 is fixed to the pipe 12 similarly to the partition plate 34 of the first temporary closing means 30, and the bag body 62 is attached to the outer periphery of the partition plate 64. When compressed air is supplied to the bag body 64, the bag body 64 expands and comes into contact with the lower half of the inner peripheral surface of the underground pipe 10, thereby exhibiting a shutoff function.

The temporary closing means 66 shown in FIG.
Can be used in place of the second temporary cutoff means 40. The temporary closing means 66 includes a bag body 68 which can be expanded and contracted in the radial direction, an annular partition plate 70 arranged outside the pipe 12, and a bag body 72 which can be expanded and contracted in the radial direction.
And a slider 74. The bag 68 is a partition plate 70
, And the bag body 72 is attached to the inner periphery of the partition plate 70. The slider 74 is cylindrical,
It is movably arranged outside the pipe 12. A fall prevention support member 76 is welded to the partition plate 70 and the slider 74, and a roller 78 is attached to the partition plate 70.
When compressed air is supplied to the two bags 68 and 72, the bags 68
Expands and comes into contact with the inner peripheral surface of the underground pipe 10, and the bag 72
Expands and comes into contact with the outer peripheral surface of the pipe 12 to exhibit a shutoff function. When the two bags 68 and 72 are contracted, the temporary closing means 66 can move relative to the pipe 12 in the axial direction. At this time, since the roller 78 supports the partition plate 70, the bag 72 does not get caught between the partition plate 70 and the pipe 12.

At least two sets of fixing means 80 and 82 are attached to the pipe 12 at intervals in the axial direction of the pipe 12. Since the two sets of fixing means 80 and 82 can have the same structure, the fixing means 80 will be described with reference to FIG. The fixing means 80 is movable in the axial direction of the pipe, and is capable of being fixed.
A second support 86 fixed to the pipe 12, and these supports can expand and contract in the radial direction.

The first shoring 84 includes a cylindrical housing 88 disposed radially outward and a jack 90 attached to the housing 88 so as to be able to expand and contract in the axial direction with respect to the housing 88. The housing 88
Are welded to the cylindrical slider 92. Slider 9
Reference numeral 2 is disposed outside the pipe 12 so as to be relatively movable with respect to the pipe. A total of three (only one is shown in the figure) housings 88 are arranged at equal intervals in the circumferential direction and are welded to the slider 92. Thus, the three housings 88 and the jacks 90 attached to each housing 88 move with the slider 92 when the slider 92 moves. In addition, three (only one is shown in the figure) propulsion jacks 94 are mounted outside the housing 88 and parallel to the axis of the pipe 12.

The second support 86 comprises a cylindrical housing 96 disposed outward in the radial direction, and a jack 98 attached to the housing 96 so as to be able to expand and contract in the axial direction with respect to the housing 96. And housing 96
Are welded to the cylindrical slider 100. The slider 100 is disposed outside the pipe 12 so as to be relatively movable with respect to the pipe. 3 at equal intervals in the circumferential direction
One (only one is shown in the figure) housing 96 is disposed and welded to slider 100. Therefore,
The three housings 96 and jacks 98 attached to each housing 96 move with the slider 100. In addition, three (only one is shown in the figure) fixed jacks 102 are mounted outside the housing 96 and parallel to the axis of the pipe 12;
Three (only one is shown in the figure) brackets 10
4 is attached to a portion of the pipe 12 corresponding to the fixed jack 102. The stroke of the fixed jack 102 is shorter than the stroke of the propulsion jack 94. The eye 103 at the end of the piston rod of the fixed jack 102 is
It is provided so as to be aligned with the hole 105 of the bracket 104. The second support 86 is fixed to the pipe 12 by aligning the eye 103 with the hole 105 and inserting a pin (not shown). The second support 86 further includes a hole 1 that is aligned with an eye 95 at the end of the piston rod of the propulsion jack 94.
A bracket 106 having a 07 is attached.

The lifting machine 14 is arranged to be rotatable around the pipe 12 and to be movable in the axial direction of the pipe 12. With reference to FIG.
Is composed of a base 110 and a plurality of jacks 112 attached to the base 110 so as to be able to expand and contract radially outward.
And a cutter head 114 supported by the jack 112 and extended and contracted by the jack 112. Base 1
10 is a support arm 116 protruding toward the pipe 12.
The support arm 116 is suspended via a bearing on a guide rail 120 extending over the entire circumference of the slider 118 in the circumferential direction, and is movable in the circumferential direction with respect to the slider 118. On the other hand, the slider 118 is formed in a cylindrical shape as a whole, and is engaged with a key 124 planted on a cylindrical shaft 122 so as to be movable in the axial direction of the shaft 122 and not to rotate with respect to the shaft 122. It is located outside the shaft 122 where possible. Shaft 1
22 is arranged outside the pipe 12 and
2 can be moved relative to the axis in the axial direction.

As described above, the second fixing means 82 can have substantially the same structure as the first fixing means 80, but the second support means of the second fixing means shown in FIG. Construction 12
6 has substantially the same structure as the first shoring 84. That is, the second support 126 includes a cylindrical housing 128 disposed radially outward, and a housing 128 that is capable of extending and contracting in the axial direction with respect to the housing 128.
, And a housing 128 is welded to the shaft 122. A total of three (only two are shown in the figure) housings 128 are circumferentially equally spaced and welded to the shaft 122. Accordingly, three housings 128 and jack 1 attached to each housing 128
30 moves together with the shaft 122. In addition, 3
One (only two are shown in the figure) propulsion jacks 13
2 is mounted outside the housing 128 so as to be parallel to the axis of the pipe 12. An eye 133 at the end of the piston rod of the propulsion jack 132 can be aligned with a hole 135 in a bracket 134 attached to the slider 118.

When the eye 133 of the propulsion jack 132 and the hole 135 of the bracket 134 are aligned and connected by a pin (not shown), and the propulsion jack 132 is extended, the slider 118 moves in the axial direction of the shaft 122 and the lifting machine 14 is moved. Is moved in the axial direction of the pipe 12. On the other hand, a swing motor 136 is mounted on the base 110, and a pinion 138 of the swing motor is engaged with a rack gear 140 arranged on the outer periphery of the slider 118. When the swing motor 136 is operated, the lifting machine 14 moves in the circumferential direction of the pipe 12. Moving.

A form 24 is attached to the pipe 12. Referring to FIG. 7 in a side view, the formwork 24 can be deformed to a radially outward enlarged position (a in the figure) and an inward contracted position (b in the figure). Formwork 24 is supporting material 2
6 and a face plate 27, which are divided into four sets. Two sets of split molds 1 located in the diameter direction among the four sets
42 has substantially the same structure, and the remaining two sets of split molds 14
4 has substantially the same structure. Each split mold 142, 144
The support material 26 is formed in a nested manner, and the support material 2
6 is swingably attached to a cylindrical shaft 146 by a spherical joint. The shaft 146 is relatively movable with respect to the pipe 12. Jack 148 is shaft 1
The face plate 27 is guided to the enlarged position and the reduced position by the jack 148.
One of the split dies 142 and 144 is formed such that one stroke is larger than the other stroke, and can take a reduced position without interfering with each other.

The repair device is operated as follows. The pipe 12 is carried to the place to be repaired, the jack 98 of the second support 86 of the first fixing means 80 is extended, and the second support 86 is fixed to the underground pipe 10, and the fixed jack 10 is fixed.
2 eye 103 and hole 1 in bracket 104 of pipe 12
05 with a pin. Further, the second shoring 126 of the second fixing means 82 and, if necessary, the shoring 150 disposed downstream of the hanging machine 14 are similarly fixed to the underground pipe 10. The shoring 150 has a structure similar to that of the second shoring 86 of the first fixing means 80.

The bag 3 of the first temporary closing means 30 on the upstream side A
2, the upstream side is closed, and the bag body 62 of the fourth temporary closing means 60 on the downstream side B is expanded to close the downstream side. Then, water or water and solids flow from the upstream side to the downstream side through the pipe 12. The jack 130 of the second support 126 of the second fixing means 82 is extended to extend the second support 1
26 is fixed to the underground pipe 10, the lifting machine 14 is moved around the pipe 12, and the inner periphery of the underground pipe 10 is circumferentially suspended. After the lifting operation is completed, the lifting machine 1
4 in the axial direction of the pipe 12,
In a single operation, the robot moves by a distance corresponding to the width that can be lifted, and performs circumferential dropping again. This operation is repeated, and when the stroke end of the propulsion jack 132 is reached, the jack 130 of the second support 126 is reduced, the propulsion jack 132 is reduced, and the second support 126 is moved toward the lifting machine 14. Then, the interval between the second supporter 126 and the lifting machine 14 is returned to the same state as the interval at the start, and the above operation is repeated.

When the axial movement of the pipe 12 of the lifting machine 14 can no longer be performed by the above-mentioned operation, the first support 84 of the first fixing means 80 is moved toward the second support 86, The eye 95 of the propulsion jack 94 is aligned with the hole 107 of the bracket 106 and connected by a pin.
Then, the jack 90 of the first shoring 84 is extended, and the first shoring 84 is fixed to the underground pipe 10. Similarly,
The first supporter 84 of the second fixing means 82 is moved toward the second supporter 126, and the jack 90 is extended to fix the first supporter 84 to the underground pipe 10. After the first shoring 84 is fixed, the fixing of the second shoring of each fixing means is released. Next, the second temporary closing means 40 on the upstream side is moved to the vicinity of the first shoring 84 which is moving to the downstream side,
The second temporary closing means 40 is fixed to the underground pipe 10 by inflating the bag body 42. Further, the third temporary closing means 54 on the downstream side is moved downstream to a predetermined position, and the bag body 56 is inflated to fix the third temporary closing means 54 to the underground pipe 10.

After fixing the second temporary closing means 40 and the third temporary closing means 54 to the underground pipe 10, the bag 32 of the first temporary closing means 30 is contracted, and the fourth temporary closing means The bag body 62 of 60 is contracted. When the propulsion jack 94 provided on the first shoring 84 of the first fixing means 80 is extended, the pipe 12 moves downstream, and the lifting machine 14 and the formwork 24 also move together with the pipe 12. . Therefore, the lifting machine 14 reaches the place where the underground pipe 10 should be hung. When the formwork 24 comes off and reaches the exposed portion 18, an anticorrosion sheet is attached using the formwork 24,
Or inject mortar.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing an embodiment of a method and a device for repairing an underground pipe according to the present invention.

FIG. 2 is a cross-sectional view showing the first temporary closing means, and the second temporary closing means is indicated by a virtual line.

FIG. 3 is a cross-sectional view showing a second temporary closing means, and the first temporary closing means is indicated by an imaginary line.

FIG. 4 is a cross-sectional view showing another example of the second temporary closing means;
Are indicated by phantom lines.

FIG. 5 is a sectional view showing a first fixing means.

FIG. 6 is a sectional view showing a lifting machine and a second supporter.

FIG. 7 is a side view of the mold, in which (a) shows an enlarged state;
(B) shows a reduced state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Underground pipe 12 Pipe 14 Lifting machine 18 Exposed part 20 Corrosion-proof sheet 24 Formwork 30 First temporary closing means 32,42,68,72 Bag 40 Second temporary closing means 54 Third temporary closing means 60 fourth temporary closing means 80 first fixing means 82 second fixing means 84 first shoring 86, 126 second shoring

Continued on the front page (72) Inventor Satoshi Matsuda 2-1 Tsukudocho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Head Office

Claims (10)

[Claims] 1. A method for repairing an underground pipe, wherein the upstream and downstream sides of a portion of the underground pipe to be repaired are closed, and water or water and solids are passed by passing a pipe to the closed section. Flowing from the upstream side through the pipe to the downstream side, bringing a lifting machine to a predetermined position in the axial direction of the pipe while flowing water or water and solids through the pipe, and moving the lifting machine around the pipe. Then, the inner peripheral edge of the underground pipe is removed, and then the lifter is moved a predetermined distance in the axial direction of the pipe, and the lifter is moved around the pipe to remove the inner peripheral edge of the underground pipe. How to repair underground pipes repeatedly. 2. The method according to claim 1, wherein after the inner peripheral edge of the underground pipe is removed, an anticorrosion sheet is attached to the exposed underground pipe. 3. The method of repairing an underground pipe according to claim 2, wherein a formwork is arranged inside the underground pipe to support the anticorrosion sheet. 4. After the inner peripheral edge of the underground pipe has been stripped, a formwork is arranged at an interval inward from the stripped and exposed underground pipe, and mortar is injected into the gap. The method for repairing underground pipes according to claim 1. 5. The method for repairing an underground pipe according to claim 4, wherein an anticorrosion sheet is attached to an inner periphery of the mortar. 6. The method for repairing an underground pipe as claimed in claim 1, wherein the upstream side of the underground pipe is closed over the entire cross section, and at least a portion of the downstream side below the free surface of water is closed. 7. An apparatus used for repairing an underground pipe, comprising: a pipe; and a first pipe attached to an outer periphery of an upstream end of the pipe.
A first temporary closing means having a bag body which can be expanded and contracted in the radial direction, and a second temporary closing means attached to an outer peripheral portion of a pipe downstream of the temporary closing means. A second temporary cut-off means having a bag body which can expand and contract in a radial direction, and a third temporary cut-off means attached to an outer periphery of a downstream end of the pipe.
A third temporary closing means having a bag body capable of expanding and contracting in the radial direction; and a fourth temporary closing means attached to an outer peripheral portion of a pipe upstream of the third temporary closing means. A fourth temporary closing means having a bag body which can be expanded and contracted in a radial direction, and at least two sets of fixing means attached to the pipe at intervals in an axial direction of the pipe; Each fixing means has a first support that is movable in the axial direction of the pipe and can be fixed, and a second support that is fixed to the pipe, and these supports can expand and contract in the radial direction. At least two sets of fixing means, and a lifting machine arranged rotatably around the pipe and movable in the axial direction of the pipe, wherein the first temporary cutoff means and the second One of the temporary closing means and the third temporary closing means A repair device wherein one of the cutting means and the fourth temporary closing means is relatively movable in the axial direction with respect to the pipe. 8. The repair device according to claim 7, wherein the temporary closing means movable relative to the pipe has a sealing material on an inner peripheral edge facing the pipe. 9. The repair device according to claim 7, further comprising a formwork attached to the pipe and capable of being deformed to a radially outward enlarged position and an inwardly reduced position. 10. The first temporary cut-off means and the second temporary cut-off means are formed so as to cut off the entire cross section of the underground pipe, and the third temporary cut-off means and the fourth temporary cut-off means are provided. The repair device according to claim 7, wherein the shutoff means is formed so as to shut off at least a portion below a free surface of water.