JPH07167344A - No blow and exchanging method for pipe for which no blow tool is used - Google Patents

Abstract

PURPOSE:To facilitate cutting work of a pipe such as an active pipe in air tight inner space by making a cover member to air-tightly slide on and touch the outer circumfer ential surface of an installing member in such a condition that the installing member and the cover member are assembled together and subjected to an angular displace ment. CONSTITUTION:A set 18 of installing members 18a, 18b which are formed in a pair of divided halves and the other set 19 installing members 19a, 19b are arranged in pipe axial direction of a pipe 17 at intervals. Cover members 20a, 20b which are formed in divided halves are provided on each set of installing members 18, 19, the cover members 20a, 20b air-tightly slide on and touch the outer circumferential surface of the installing members 18, 19, and any angular displaced is allowed around an axial line 21 which matches the pipe shaft of a pipe 17. The other cover member 20a has a cylindrical part 22 which extends to an outer side, a tool installing hole 23 is formed on the play end part of the cylindrical part 22, and the cover members 20a and 20b are air-tightly connected to each other by connecting means 24, 25. The operating rod 70 of a pipe cutter 16 is air-tightly inserted in the tool inserting hole 23. It is thus possible to facilitate cutting work of the pipe 17 such as an active pipe in air-tight inner space so as to prevent leakage of fluid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is suitable for carrying out cutting and replacement work, for example, with underground pipes for supplying city gas as active pipes and without leakage of city gas. And a tube replacement method using the same.

[0002]

2. Description of the Related Art A typical prior art is shown in FIG. The underground gas pipe 2 for underground gas transportation buried in the soil 1 is branched from the underground gas pipe 4 through the valve Q3, and city gas is supplied to each home through the pipe 4. Road 5 is on soil 1. When replacing the underground buried pipe 4 which is a domestic service pipe, first, refer to FIG. 25 (1).
As shown in Fig. 5, a relatively small vertical hole 6 is excavated in the road 5 to expose the valve chi 3, and the valve chi 3 is operated to prevent the city gas from the pipe 2 to the pipe 4 from branching to the gas to the pipe 4. And the vertical hole 6 is backfilled.

Next, as shown in FIG. 25 (2), the road 5
A vertical hole 7 is formed by excavating approximately half of the width direction of the pipe 4, the pipe 4 is exposed, the pipe 4 is cut and removed at the cutting position 8, and a new pipe is replaced. Therefore, the vertical hole 7 is then backfilled.

Next, as shown in FIG. 25 (3), the road 5
The remaining half of the width direction of the above is excavated to form the vertical hole 9, and the pipe 4 between the valve chi 3 and the cutting position 8 is replaced with a new pipe. Thereafter, the valve chi 3 is operated to supply the city gas from the pipe 2 to the new pipe 4 after being replaced through the valve chi 3, and the vertical hole 9 is backfilled. In this way, the replacement work of the pipe 4 is performed so as to prevent the occurrence of a traffic closure on the road 5 as much as possible.

[0005]

In such a prior art, as shown in FIG. 25 (1), the valve 4 is exposed to block the branching of city gas to the pipe 4, and then the pipe 4 is removed. Need to change.

In some cases, it may not be possible to excavate the vertical hole 6 for exposing the valve chi 3 due to problems such as vehicle closure and regulation of construction time. In such a case, the pipe 4 may be activated. In the prior art, in order to replace the pipe as it is, the construction must be performed in a state where the city gas is jetted and leaked, which is dangerous. Further, even when only a part of the downstream side of the pipe 4 is replaced, the vertical hole 6 must be excavated and the valve chi 3 must be operated in order to prevent such raw gas ejection, and the vertical hole 6 is excavated. Even if you can
The construction cost is increased by excavating the vertical hole 6.

An object of the present invention is to improve the workability and to replace a pipe without causing a fluid such as raw gas so to speak without a blow, and to replace a pipe using the same. Is to provide a method.

[0008]

The present invention provides (a) two sets of mounting members, each set of mounting members being formed in half and forming a pair, and mounted on the outer peripheral surface of the pipe. And (b) a cover member that is formed in half and forms a pair, and in the assembled state of the mounting member and the cover member, the outer peripheral surface of the mounting member is airtightly slidably contacted to rotate around the axis line. Can be angularly displaced from each other with respect to the mounting member, and one cover member has a tubular portion extending outward, and a tool insertion hole is formed at a free end portion of the tubular portion. The member and the other other cover member include a cover member that can be airtightly connected, and (c) a connecting means that connects the cover members that form a pair to each other so that the cover member can be opened and closed. .

Further, according to the present invention, a pair of lid members each having a notch forming the tool insertion hole are provided at the free end portion of the tubular portion so as to be opened and closed, and the lid member is closed so as to be opened and closed. It is characterized in that means for holding it as it is is provided.

Further, the present invention is characterized in that at least a part in the longitudinal direction of the cover member is constituted by a sheet having a light transmitting property and a flexibility.

Still further, according to the present invention, (a) a second underground buried pipe is branched and connected to the first underground buried pipe via a valve chi, and (b) a no-blow tool is prepared, This no-blow tool is (b1) two sets of attachment members, each set of attachment members being formed in half and forming a pair, and (b2) an attachment member attached to the outer peripheral surface of the pipe.
A pair of cover members formed in a half-split shape, and in a state in which the mounting member and the cover member are assembled, the outer peripheral surface of the mounting member is airtightly slidably contacted with each other and angular displacement is mutually performed around the axis with the mounting member. It is possible that one of the cover members has a tubular portion that extends outward, and a tool insertion hole is formed at the free end of the tubular portion, and the one cover member and the other cover are provided. The member includes a cover member that can be airtightly connected, and (b3) a connecting means that connects the pair of cover members so that the cover member can be opened and closed. (C) A vertical hole is drilled to expose the second pipe. , A no-blow tool is installed in the middle of the second pipe, and the part of the second pipe surrounded by the no-blow tool is cut by a pipe cutter inserted into the tool insertion hole, Also inserts the bag body on the upstream side so that the fluid can be removed. In the disconnected state, the portion of the second pipe downstream of the cutting position is removed, and in this blocked state, a new tip is added to the end of the portion of the second pipe upstream of the cutting position. The third pipe is connected, (d) after that, the bag body is removed from the Qi plug connection port, the plug is attached to the plug connection port, and (e) the vertical hole is drilled so that the first pipe is exposed. To stop the branching of the fluid to the second pipe, and (f) replace the portion between the cutting position of the second pipe and the valve Qi with a new fourth pipe and connect it to the third pipe. This is a method for replacing a pipe.

[0012]

According to the no-blow tool of the present invention, the outer peripheral surface of a pipe such as an underground pipe to be replaced or cut,
Two sets of mounting members are mounted at intervals in the axial direction of the pipe, and since the mounting members of each set form a pair and are split in half, they can be easily mounted on the outer circumference of the pipe. A cover member forming a pair of halves is attached to the outer surface of the attachment member thus attached by the connecting means, and one cover member is formed with a tubular portion extending outward. For example, an operating rod of a pipe cutter is airtightly inserted into a tool insertion hole formed at the free end of the tubular portion, and a pipe such as a live tube is formed in an airtight internal space formed by a mounting member and a cover member. It is possible to perform cutting work and the like.

According to the present invention, the free end portion of the tubular portion is provided with a pair of lid members that can be opened and closed, and these lid members are formed with, for example, a semicircular shape for forming a tool insertion hole. A notch is formed, which facilitates the work of inserting the tool into the insertion hole and attaching it.

Further, according to the present invention, at least a part of at least one of the pair of cover members in the longitudinal direction is made of a light-transmissive sheet, so that the work can be performed while observing the working condition of the airtight space. It can be carried out. Further, since this sheet has flexibility, the work tool such as the pipe cutter can be easily reciprocally displaced about the tube axis by the deformation of the cover member.

Further, according to the present invention, the above-mentioned mounting member and cover member can be angularly displaced about the axis, and this also allows the pipe cutter and the like to be reciprocally angularly displaced about the pipe axis for work. It will be easy.

Further, according to the method for exchanging tubes according to the present invention, the bag and the chee are further used to replace the second tube branched from the first tube through the valve chee with the third and fourth tubes. It is possible to perform work in a live tube state without leaking fluid such as city gas to the outside.

[0017]

1 is a perspective view showing a state in which a pipe 17 is cut by using a no-blow tool 15 and a pipe cutter 16 according to an embodiment of the present invention, and FIG.
FIG. 3 is a perspective view showing a state in which is attached to the pipe 17, and FIG. 3 is a side view showing the no-blow tool 15 shown in FIG. 1 and a pipe cutter 16 provided in association therewith.
Referring to these drawings, in the no-blowing tool 15, a pair of half-divided mounting members 18a, 18
b, another pair of half-divided mounting members 19a,
19 b is attached to the outer peripheral surface of the pipe 17. In this way, the set 18 of the attachment members 18a and 18b and the attachment member 19a and 19b of the other set 19 are arranged at intervals in the pipe axial direction of the pipe 17. The subscripts a and b attached to the reference numerals 18 and 19 may be omitted, and may be generally shown only by numbers. The mounting members 18 and 19 of each set are provided with cover members 20a and 20b formed in a half-split shape. In the state shown in FIGS. 1 and 3 in which the mounting members 18 and 19 and the cover member 20 are assembled, the cover member 20 is airtightly slidably contacted with the outer surfaces of the mounting members 18 and 19, and the axis line coincides with the pipe axis of the pipe 17. The mounting members 18, 19 and the cover member 20 can be angularly displaced with respect to each other around 21.

One cover member 20a has a cylindrical portion 22 extending outward (upward in FIGS. 1, 2 and 3). A tool insertion hole 23 is formed at the free end of the tubular portion 22. One cover member 20a and the other cover member 20b can be hermetically connected. The cover members 20a and 20b forming a pair are openably and closably connected by connecting means 24 and 25 called a so-called patch lock.

The metal end plate 2 of one cover member 20a
6 is formed with an insertion hole 27, and the insertion hole 27 is formed in FIG.
As shown in the usage state, the flexible tube 14 is inserted, compressed air is supplied / exhausted into / from the flexible bag body 29 in the no-blow tool 15 of the present case, and the bag body 29 is compressed by the compressed air.
Can be inflated to shut off the tube 17 after cutting.

FIG. 5 is a sectional view of the mounting members 18a, 18b and the cover members 20a, 20b near the end plates 26, 28. The mounting member 18a is made of a metal cylinder 30 having a packing 29a lined therein that elastically contacts the outer peripheral surface of the pipe 17.
a and a metal retaining piece 3 fixed to the cylindrical body 30a
1a, the other mounting member 18b also has a similar structure, and the corresponding parts have the same numbers with the subscript b.
Is attached.

A seal member 32a is fixed to the end plate 26 of the cover member 20a, and the seal member 32a is brought into sliding contact with the outer peripheral surface of the cylindrical body 30a to maintain airtightness. The seal member 32a has a structure in which a non-woven fabric such as felt is impregnated with lubricating oil. A sheet 33 such as a flexible rubber thin plate is attached to the insertion hole 27, and the flexible tube 14 is inserted into the insertion hole 34 formed in the sheet 33.
Is kept airtight. The sheet 33 has flexibility and elasticity.

A tubular body 30a is fixed to the inner peripheral portion of the end plate 26, a transparent and flexible sheet 35a is arranged on the outer peripheral portion thereof, and is airtightly fixed by a fixing piece 36a. . The sheet 35a is made of a material such as soft vinyl chloride. The other cover member 20b also has a similar structure, and the corresponding parts are indicated by the same numerals with the subscript b.

FIG. 6 shows the end plate 2 of the cover members 20a and 20b.
6 and 28 and the attachment members 18a and 18b, and FIG. 7 is a sectional view taken along the section line VII-VII in FIG. The translucent and flexible sheet 35b of the cover member 20b is hermetically fixed by being sandwiched between the support tube 34b and the metal mounting piece 36b, as described above with reference to FIG. Further, it is sandwiched between a pair of metal sandwiching pieces 37b, 38b extending along the axis 21 and supported near both ends of the end plate 28 in the circumferential direction. The ends of the longitudinal holding members 37b and 38b are end plates 28.
Fixed to. The other cover member 20a has the same structure, and the corresponding parts are indicated by the same numerals with the subscript a. These cover members 20a,
20b also has end plates 39, 40, the no-blow tool 15 being constructed symmetrically about a plane of symmetry 41 perpendicular to the axis 21. As shown clearly in FIG. 3, the sandwiching pieces 38a, 38b are formed with V-shaped notches 42a, 42b, respectively, and the sandwiching pieces 37a, 37b have the same structure. It becomes possible to bend with, and thereby workability when the pipe cutter 16 is used is improved.

End plates 26, 28; 39, 40 are hinges 44.
The cover member 20 around the axis parallel to the axis 21
a and 20b can be opened and closed.

FIG. 8 is a plan view showing the lid members 45 and 46 provided at the free end portion of the tubular portion 22, and FIG. 9 is a sectional view taken along the section line IX-IX in FIG. 10 is a cross-sectional view taken along the section line XX of FIG. With reference to these drawings, the tubular portion 22 is made of the above-mentioned translucent and flexible sheet, and a mounting ring 47 is fixed to the upper portion thereof. This mounting ring 47 is rigid and has hinges 48, 49.
The lid members 45 and 46 described above are attached so as to be openable and closable. A metal support ring 50 is fixed to the inner peripheral portion of the mounting ring 47, and a seal member 51 is fixed to the upper portion thereof. The lid members 45 and 46 are formed in a substantially semicircular plate shape in the closed state in FIG. 8, and the lid members 45 and 46 are formed in a substantially semicircular notch 5 that forms the tool insertion hole 23.
Sealing members 54, 55 having 2, 53 are fixed.
Furthermore, a support plate 56 extending in the diameter direction of the mounting ring 47 is fixed to the lid member 45, and a U-shaped notch 57 is also formed in this support plate 56. A seal member 58 is fixed to the lower surface of the support plate 56 and contacts the upper surface of the lid member 46 to achieve airtightness. Seal members 54, 55, 5
8. Further, the above-mentioned seal member 51 and the like may be realized by a rubber plate having elasticity. Lid member 45,
Retaining means 59, such as a patch lock, holds the support plate 56 and the mounting ring 47 in order to hold the part 46 closed and partially overlapped as clearly shown in FIG.
It is provided in connection with.

FIG. 11 shows the holding means 59 seen from the lower side of FIG.
FIG. 12 is a side view of the holding means 59. This holding means 59 is, for example, a patch lock in this embodiment, and a bracket 60 fixed to the mounting ring 47 is provided with an operating piece 62 swingable by a pin 61. An engagement piece 63 is fixed to the support plate 56. A proximal end portion 65 of a locking member 64 bent in a substantially U-shape that can be locked to the locking piece 63 is angularly displaceable on the operation piece 62 around an axis parallel to the pin 61. It is provided. In a state where the locking member 64 is locked to the locking piece 63 and the end portion 66 of the operation piece 62 is in contact with the outer peripheral surface of the mounting ring 47, the base end portion 65 and the locking portion of the locking member 64. 67
The curve connecting with and is on the right side of FIG. 12 with respect to the axis of the pin 61, and thereby the locked state is kept stable.

When the holding means 59 is unlocked, the operating piece 62 is angularly displaced around the arrow 68 in FIG. 12, and the straight line connecting the base end portion 65 of the locking member 64 and the locking portion 67 is pin 6.
The locking portion 67 can be removed from the locking piece 63 so that the holding state can be released so that the locking portion 67 is on the left side of the axis line of FIG. The above-mentioned connecting means 24 and 25 also have the same structure.

FIG. 13 is a front view of the pipe cutter 16 for cutting the pipe 17. The pipe cutter 16 has an operating rod 70 to which a handle 69 is attached, and the external screw engraved on the operating rod 70 is the internal screw 7 of the cutter body 71.
Screw to 2. A pair of cutting blades 73 is rotatably attached to an end portion of the operation rod 70 on the side opposite to the handle 69, and the tube 17 is supported by a pair of rollers 74 provided on a main body 71 thereof. The handle 69 is operated to rotate about the axis of the operating rod 70 to move the cutting blade 73 to the roller 74.
By pressing against the pipe 17 supported by, and performing a reciprocal angular displacement about the pipe axis of the pipe 17 as indicated by arrow 75,
The cutting blade 73 can bite into the tube 17 and cut the tube 17.

FIG. 14 is a perspective view of the no-blow cover 76 used when replacing the pipe 17. A sealing member 78 made of an annular soft rubber is attached to one end of a cylindrical body 77 such as a transparent and flexible soft vinyl, and a central hole 79 is formed in the sealing member 78. . An operator can insert the hand 80 into the cylindrical body 77 through the hole 79. A seal member 81 similar to the above-mentioned annular seal member 78 is provided at the other end of the cylindrical body 77, and a hole 82 is formed therein. Therefore, the operator inserts the plug 85 into the plug connection port 84 of the chi 83 in the cylindrical body 77.
The connection port 84 can be inserted through the hole 82 of the seal member 81 in this state, and thus the plug can be prevented from leaking fluid such as city gas from the connection port 84.

FIG. 15 is a perspective view of a blocking tool 120 for blocking the tube 17 after cutting the tube 17. The flexible tube 14 is connected to the flexible bag body 29, and the manual pump 8
By repeatedly pressing 6
It can be expanded in 7 as indicated by reference numeral 87 to prevent the fluid in tube 17 from leaking.

With reference to FIGS. 16 to 21, when the pipe 17 is an underground buried pipe, the replacement work of the pipe 17 is performed by the no-blow tool 15, the pipe cutter 16, the no-blow cover 76 and the shutoff according to the present invention. The work performed using the tool 120 will be described. First, in FIG. 16, an underground buried pipe 90 for transporting a fluid such as city gas is buried in the soil 89 which is a road.
Are branched and connected. The pipe 17 is connected to a gas consuming device via a gas meter 92 in each home. When replacing the pipe 17, first, about half the width of the road is excavated to form the vertical hole 93. When replacing the portion of the pipe 17 indicated by reference numeral 17a with a new pipe 17b, the no-blow tool 15 of the present invention is attached to the pipe 17 exposed in the vertical hole 93, as shown in FIG. As shown in FIG. 2, it is opened in half and attached, and the state shown in FIG. 1 is obtained. After the cover members 20a and 20b are connected by the connecting means 24 and 25 and attached to the pipe 17, the lid members 45 and 46 are opened to accommodate the pipe cutter 16 in the cover members 20a and 20b, and the operation rod 70 is It partially projects upward from the lid members 45 and 46. Further, as shown in FIG. 4 described above, the flexible tube 14 is inserted into the insertion hole 27 in a state where the bag body 29 of the barrier 120 is reduced, and the bag body 29 is covered with the cover member 2.
It is within 0a and 20b. In this state, the pipe cutter 16 is operated to cut the pipe 17.

Therefore, as shown in FIG.
The bag body 29 of 0 is inserted into the pipe 17 at the upstream side of the cutting position 94, that is, near the valve che 91, and the blocking device 12
The manual pump 86 of No. 0 is operated to inflate the bag body 29 as shown in FIG. In this way, the tube 17 is in a live state,
The pipe 17 can be cut so that the city gas does not leak outside. With the bag 29 of the blocking device 120 being used to block the pipe 17 near the cutting position 94, as shown in FIG. 19, the chi 83 is connected at the cutting position 94 of the pipe 17 and the chi 95 is connected. The flexible tube 14 of the breaker 120 is inserted through the plug connection port 96.

The specific construction of the valve chi 91 is shown in FIG.
Is shown in. A valve Qi main body 98 is connected to the pipe 90, and an internal screw 99 is engraved inside the main body 98, and the plug 8
23 is arranged above the connection port 101 with the pipe 17 so that the city gas from the pipe 90 branches to the pipe 17, or this plug 85 is referred to by the reference numeral 10
It moves by screwing, as indicated by 2, which causes the pipe 9
Cut off the branch of city gas from 0 to pipe 17. 16-
In the working state of FIG. 20, the plug 85 is as shown by the solid line in FIG. 23, the city gas is branched from the pipe 90 to the pipe 17, and the pipe 17 is in the active pipe state.

An elbow 105 is connected to the chi 83, and a new pipe 17b is connected to the elbow 105.

Next, as shown in FIG. 20 and also in an enlarged cross section in FIG. 22, the no-blow cover 76 is attached to the plug connection port 96 of the chi 83, and the operator has the no-blow cover 76. The air inside the bag body 29 is discharged inside, and the barrier 120 is taken out from the pipe 17 and the chi 83,
Next, the plug 85 is attached to the plug connection port 96 to hermetically close the plug connection port 96. Such work is Chi 83
This is done only in the vicinity, so that the vertical holes 93 are partially backfilled and the work associated with the chi 83 is performed in the vertical holes 106. After that, as shown in FIG. 21, a vertical hole 107 connected to the vertical hole 106 is excavated in the soil 89, and a pipe 90 and a pipe 17 are formed.
Expose the rest of the. Therefore, the plug 85 shown in FIG. 23 in the valve chi 91 is moved from the position shown by the solid line to the position 102 shown by the phantom line to cut off the split flow of the city gas to the pipe 17. In this state, the pipe 17c is removed from the main body 98 of the valve chi 91 and is also removed from the chi 83, and a new pipe 17d is attached to the main body 98 of the valve chi 91 and the chi 83.
Connect between and. The above-mentioned reference numerals 17, 17a to 17d
The old and new pipes, indicated by, are generally designated by reference numeral 17.
May be indicated by.

Thus, the pipe 17 connected to the valve chi 91 can be replaced with new pipes 17b and 17d without leaking city gas. Finally vertical hole 1
Backfill 07.

FIG. 24 is a partial sectional view of a no-blow tool according to another embodiment of the present invention. This embodiment is similar to the previous embodiment, and the corresponding parts bear the same reference numerals. This FIG. 24 corresponds to the cross section of FIG. 5 described above. It should be noted that in this embodiment, the mounting members 18a and 18b are formed with guide grooves 111a and 111b that are concentric with the tube axis, and the cover members 20 are provided in the guide grooves 111a and 111b.
Fitting protrusion 11 formed on end plates 26 and 28 of a and 20b
2a and 112b are fitted in an airtight manner, so that the mounting members 18a and 18b and the cover members 20a and 20b can be angularly displaced relative to each other around the tube axis.

The present invention can be widely applied not only for replacement of underground gas pipes for city gas transportation but also in connection with pipe construction.

[0039]

As described above, according to the no-blow tool of the present invention, the outer peripheral surface of the pipe is formed in half and forms a pair.
First, a pair of mounting members are mounted, and a half-divided cover member capable of angular displacement is mounted on the outer surface of the mounting member, and a tool insertion hole is formed in the cylindrical portion formed on one side of the cover member. For example, a pipe cutter can be inserted into the tool insertion hole to easily cut a pipe, and even if the pipe is in a live state, the fluid is prevented from undesirably leaking. Get off.

According to the present invention, the mounting member and the cover member can be angularly displaced from each other, and at least a part in the longitudinal direction of the cover member has flexibility, so that the tool can be mounted on the pipe shaft, for example. It becomes possible to easily perform work such as swinging back and forth around.

Further, according to the present invention, a pair of lid members is provided at the free end of the cylindrical portion formed on one cover member so as to be openable and closable, and the notch formed in the lid member is used for the tool. Since the insertion hole is formed, the tool can be easily attached to the no-blow tool of the present case, and the workability is improved.

Further, according to the present invention, since at least a part of the cover member in the longitudinal direction is made of a flexible sheet, the work can be performed while observing the working condition in the no-blow tool. The property is improved.

Furthermore, according to the pipe replacement method of the present invention,
In addition to the no-blow tool, using a bag and a chi, the second pipe branched from the first pipe via the valve chi is replaced with new third and fourth pipes without fluid leakage,
It can be carried out. Moreover, since the second pipe can be replaced with the second pipe without leaking fluid while the live pipe is in the active state, the valve Qi can be operated to change the first pipe to the second pipe prior to the construction work. It is not necessary to interrupt the branch, which also improves workability.

[Brief description of drawings]

FIG. 1 is a perspective view showing a simplified configuration of a no-blow tool 15 according to an embodiment of the present invention.

FIG. 2 is a simplified perspective view showing a state in which the no-blow tool 15 is attached to the pipe 17.

FIG. 3 is a side view showing a state in which the no-blow tool 15 is attached to a pipe 17.

FIG. 4 is a simplified perspective view showing a state in which a work is performed by attaching a blocking member 85 to the no-blow tool 15 and also attaching a pipe cutter 16.

FIG. 5: Mounting members 18a, 18b and cover member 20
It is one part sectional drawing which shows a, 20b.

FIG. 6 is a view showing a mounting member 18a, 18b and a cover member 20
It is a front view showing a and 20b.

FIG. 7 is a sectional view taken along section line VII-VII in FIG.

FIG. 8 is a plan view showing cover members 45 and 46.

9 is a cross-sectional view taken along the section line IX-IX in FIG.

10 is a cross-sectional view taken along the section line XX of FIG.

11 is a front view of holding means 59. FIG.

FIG. 12 is a side view of holding means 59.

13 is a front view of the pipe cutter 16. FIG.

14 is a simplified perspective view of a no-blow cover 76. FIG.

15 is a simplified perspective view of a breaker 85. FIG.

FIG. 16 is a cross-sectional view showing a procedure for replacing the pipe 17.

FIG. 17 is a sectional view showing a state in which the no-blow tool 15 according to the present invention is attached to the pipe 17.

FIG. 18 is a cross-sectional view showing a state in which the tube 17 is blocked by the bag body 29 of the blocking tool 85 after the tube 17 is cut.

FIG. 19 is a cross-sectional view showing a state in which a new pipe 17b is replaced and connected to the upstream end of the pipe 17 via a chi 95 and an elbow 105.

FIG. 20 is a cross-sectional view showing a state in which the no-blow cover 76 is used in association with the chee 95.

FIG. 21 shows the remaining portion 17c of the pipe 17 as a new pipe 17b.
It is sectional drawing which shows the working state at the time of exchanging.

22 is a cross-sectional view showing a state in which the no-blow cover 76 is attached to the plug connection port 82 of the chee 83. FIG.

FIG. 23 is a diagram showing a specific configuration of the valve chi 91.

FIG. 24 is a perspective view showing a mounting member 18a, 1 according to another embodiment of the present invention.
8b is a partial sectional view of another embodiment of the present invention showing the configurations of 8b and cover members 20a and 20b.

FIG. 25 is a sectional view showing a replacement work of the pipe 4 of the prior art.

[Explanation of symbols]

 15 No-blow tool 16 Pipe cutter 17, 17a to 17d Pipe 18, 18a, 18b Mounting member 19, 19a, 19b Mounting member 20a, 20b Cover member 22 Cylindrical part 23 Tool insertion hole 24, 25 Connecting means 29 Bag body 45, 46 Lid Member 52,53 Notch 59 Holding means 76 No blow cover 85 Blocking device 90 Tube 91 Valve Qi 93,106,107 Vertical hole 95 Qi 105 Elbow

Claims (4)

[Claims] 1. (a) Two sets of attachment members, each set of attachment members being formed in half and forming a pair, and attached to the outer peripheral surface of the pipe, (b) When the cover member is formed in half and forms a pair, and the mounting member and the cover member are assembled, the outer peripheral surface of the mounting member is in airtight sliding contact with the mounting member and the angular displacement of the mounting member relative to each other is performed. It is possible that one of the cover members has a tubular portion that extends outward, and a tool insertion hole is formed in the free end portion of the tubular portion, and the one cover member and the other cover are provided. A no-blow tool comprising: a cover member that can be airtightly connected to the member; and (c) a connecting means that connects the pair of cover members so that the cover member can be opened and closed. 2. A pair of lid members each having a notch forming the tool insertion hole are provided at a free end portion of the tubular portion,
The no-blow tool according to claim 1, further comprising a means that is provided so as to be openable and closable and that holds the lid member while being openably and closably closed. 3. The no-blow tool according to claim 1, wherein at least a part of the cover member in the longitudinal direction is made of a light-transmissive and flexible sheet. 4. (a) A second underground buried pipe is branched and connected to the first underground buried pipe via a valve chi, and (b) a no-blow tool is prepared. (B1) Two sets of mounting members, each set of mounting members being formed in half and forming a pair, and (b2) in half. A cover member formed to form a pair, in a state in which the mounting member and the cover member are assembled, the outer peripheral surface of the mounting member is airtightly slidably contacted with each other, and the angular displacement of the mounting member and the mounting member is possible. One cover member has a tubular portion extending outward, and a tool insertion hole is formed at a free end portion of the tubular portion, and the one cover member and the other other cover member are airtight. A cover member that can be connected to the cover member, and (b3) the cover portion forming a pair. And a connecting means for connecting openably and excavating vertical hole so as to expose the second tube (c), the second
A no-blow tool is installed in the middle of the pipe, and the part of the second pipe surrounded by the no-blow tool is cut by a pipe cutter inserted in the tool insertion hole, and is placed upstream of the cutting position of the second pipe. With the bag inserted removably to block the fluid, the portion downstream of the cutting position of the second pipe is removed, and in this blocking state, the portion of the upstream side of the cutting position of the second pipe is removed. A new third pipe is connected to the end of the portion via the chi, (d) After that, the bag body is removed from the plug connecting port of the chi, and the plug is attached to the plug connecting port, and (e) the first The vertical hole is drilled so that the pipe is exposed, and the valve Q is operated to stop the branching of the fluid to the second pipe. (F) The portion between the cutting position of the second pipe and the valve Q,
A pipe replacement method, characterized in that the pipe is replaced with a new fourth pipe and connected to the third pipe.