JP2000346435A - Method of updating already-existing duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To replace an already-existing duct without stopping air-conditioner/ ventilator function at all. SOLUTION: A temporary bypass duct 2 is additionally provided between connecting parts Rx and Ry located a little outside the both ends of an updating area L of an already-existing duct, which is superannurated reading replacement, and the duct in the updating area L is replaced while the channel is secured by switching it to the temporary bypass duct 2 from the already-existing duct 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of replacing an old air-conditioning or ventilation duct with a new one without stopping any air-conditioning / ventilation function.

[0002]

2. Description of the Related Art The air conditioning and ventilation equipment installed in a building needs to be repaired or replaced with the duct due to aging. Conventionally, maintenance of ducts has been carried out in the short term by providing emergency measures such as attaching a patch plate to the outer surface of the duct only for damaged parts, and in the long term to restore the soundness of the air conditioning and ventilation systems again. The existing duct is replaced with a new one.

[0003] The former method can be repaired without stopping the air-conditioning and ventilation functions, but it is only a temporary measure. On the other hand, the latter method can be a fundamental measure. Needed to stop the air conditioning and ventilation functions.

[0004] Under the condition that the stop of the air-conditioning / ventilation function is permitted, a method of removing the existing duct and attaching a new duct is the cheapest in terms of construction cost. However, for example, in the case of renewal of ducts installed in equipment that requires 24-hour air conditioning and ventilation (all day operation), the suspension of air conditioning and ventilation functions is severely restricted, so conventionally, the suspension time is minimized as much as possible In order to shorten the length, a method of sequentially replacing existing ducts step by step for each unit duct (hereinafter, referred to as a stepwise duct replacement method) has been adopted.

[0005]

However, even in the case of this stepwise duct replacement method, when replacing unit ducts, air conditioning or ventilation must be completely completed during the time required for removing existing ducts and installing new ducts. This causes problems such as deterioration even if the environment inside the building is temporary, and frequently stops all air conditioning and ventilation for several unit ducts, It takes a lot of time and effort to exchange,
There were also problems such as a longer construction period.

[0006] Furthermore, during the construction period, even in the case of spots, air conditioning and ventilation stops frequently, and this has a particularly large effect on equipment that requires 24-hour air conditioning and ventilation (all day operation). There was a problem.

Accordingly, a main object of the present invention is to make it possible to replace an existing duct without stopping the air conditioning / ventilation function at all.

[0008]

According to a first aspect of the present invention, a temporary bypass duct is provided in a section across an update range of an existing duct, and a flow path is switched to the temporary bypass duct. In the meantime, there is provided a method of updating an existing duct for replacing a duct in the update range, wherein a connection of the temporary bypass duct is provided at a connection portion of the temporary bypass duct. After connecting the pipes and cutting the existing duct wall surface in the closed space of the temporary bypass duct connection pipe to form a circulation port to the temporary bypass duct, a packer that blocks the flow path inside the temporary bypass duct connection pipe A first step of providing a temporary bypass duct for connecting between the temporary bypass duct connecting pipes by removing the rear sealing plate, and each of the temporary bypass ducts; A second step in which after removing the packer provided in the connecting pipe for pipes, a packer for closing the flow path is provided inside the existing duct, and the duct flow path is switched to the temporary bypass duct side, respectively, outside the existing duct renewal range. A third step of removing the existing duct in the renewal range sandwiched between the pair of packers provided in the existing duct, and installing a new duct in the renewal range, and a packer provided in the existing duct, respectively. After removal, a fourth step of providing a packer inside the temporary bypass duct connection pipe again in the temporary bypass duct connection pipe, blocking the flow path to the temporary bypass duct and switching to the existing duct side, and Removed, attached a rear sealing plate to the opening on the back side of the temporary bypass duct connection pipe, and installed a packer in the temporary bypass duct connection pipe. A fifth step of removal and is characterized in that it consists of.

According to a second aspect of the present invention, a temporary bypass duct is provided in a section straddling an update range of an existing duct, and a duct in the update range is provided while a flow path is switched to the temporary bypass duct. A method of updating an existing duct to be replaced, wherein a first insertion / removal hole of a packer whose external communication hole is freely openable and closable by a shutoff valve is provided at a connection portion of the temporary bypass duct, and a rear side opening is closed. After connecting the connecting pipe for the temporary bypass duct in which the rear sealing plate is detachably provided, and cutting the wall surface of the existing duct in the sealing space of the connecting pipe for the temporary bypass duct, and forming the circulation port to the temporary bypass duct , Said packer 1
Firstly, a packer for closing the flow path is provided inside the connecting pipe for the temporary bypass duct using the insertion / removal hole, and then the temporary blocking duct for removing the rear sealing plate and connecting the connecting pipe for the temporary bypass duct is provided. After removing the packers provided in the connecting pipes for the temporary bypass ducts from the first insertion / removal holes of the packers, the external communication holes can be freely opened and closed by shut-off valves respectively on the outside portions of the existing duct renewal range. A second step of forming a second insertion / removal hole of the packer, providing a packer for closing the flow path inside the existing duct using the second insertion / removal hole of the packer, and switching the duct flow path to the temporary bypass duct side. A third step of removing the existing duct in the renewal range sandwiched between the pair of packers provided in the existing duct and installing a new duct in the renewal range; After each of the packers provided in the existing duct is removed from the packer second insertion / removal hole, the temporary pack is connected to the temporary bypass duct connection pipe again using the packer first insertion / removal hole. A fourth step of providing a packer, blocking the flow path to the temporary bypass duct and switching to the existing duct side, removing the temporary bypass duct, attaching the rear blocking plate to the rear opening of the temporary bypass duct connection pipe, A fifth step of removing the packer in the temporary bypass duct connecting pipe from the first packer insertion / removal hole.

In these cases, for example, the packer is formed into a balloon-like packer which can be expanded and contracted by supplying and discharging a fluid, and is inserted into the duct through the packer insertion / removal hole while being folded with respect to the winding shaft. In addition, a method of exerting a packer function by expansion due to fluid supply, contracting by removing fluid at the time of removal, and removing the packer from the packer insertion / removal hole in a state of being wound up by the winding shaft is suitably adopted. In the present invention, the term "packer" includes all of the above-mentioned balloon-shaped ones and gate-type ones described below, which can block the flow path temporarily.

[0011] Further, in forming a flow opening to the temporary bypass duct in the temporary bypass duct connection pipe closed by the rear blocking plate, a perforated guide rail serving as a guide for running the cutting device is provided on the outer surface of the existing duct. On the other hand, an arm insertion hole is formed in the rear sealing plate, and a glove-shaped arm insertion body is provided inside the box continuously to the arm insertion hole, and a hand is inserted through the arm insertion hole. A method is preferably adopted in which the cutting device is directly grasped by a hand and moved along the guide rail for perforation to form the circulation port on the side surface of the existing duct.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 1, this existing duct renewal method is based on the assumption that the portions slightly outside both sides of the renewal range L of the existing duct 1 which has become obsolete and need to be replaced are respectively connected portions _RX and _RY. While the bypass duct 2 is provided in parallel and the flow path in the existing duct 1 is switched to the temporary bypass duct 2 to secure the duct flow path, the duct replacement in the section of the update range L is performed. In order to carry out the construction without stopping the air-conditioning / ventilation function at all, various matters become problematic at each construction stage. Specifically, it is necessary to connect the temporary bypass duct 2 while securing the flow path of the existing duct 1. It is necessary to block the duct flow path in the update range L while securing the duct flow path. After replacing the existing duct 1 in the renewal range L with a new duct, it is necessary to have a structure that can open the flow path cutoff. When the temporary bypass duct 2 is removed, it is necessary to temporarily block a flow port from the existing duct 1 to the temporary bypass duct 2.

A method and an apparatus for performing the construction while solving the above problems will be described in detail below according to the construction procedure.

The construction process can be roughly divided into I.I. Steps for installing the temporary bypass duct 2; Steps for switching the flow path from the existing duct 1 to the temporary bypass duct 2; Steps for updating the existing duct 1; Steps for switching the flow path from the temporary bypass duct 2 to the new duct; V. 5 of the removal process of the temporary bypass duct 2
The steps are described below in detail for each step.

[I. Attaching process of temporary bypass duct 2]
First, as shown in FIG. 2, in order to form a flow opening from the existing duct 1 to the temporary bypass duct 2, a predetermined shape is formed for the connection portions R _X and R _Y of the temporary bypass duct 2 of the existing duct 1. A drilling guide rail 3 is provided so that cutting can be performed along the line. This drilling guide rail 3
As shown in FIG. 3, a pair of left and right ridges 3a and 3b projecting outwardly and provided in a square line shape is used for cutting, for example, the head 10a of the plasma torch 10 is connected to the ridge. By making the plasma torch 10 move along the grooves 3a, 3b by contacting the grooves 3a, 3b, the rectangular bypass flow opening is closed in the temporary bypass duct connecting pipe 4A described later. It can be formed manually in the space.
The existing duct 1 in the present embodiment is a duct having a square cross section.

When the mounting of the drilling guide rail 3 to the existing duct 1 is completed, the temporary bypass duct connecting pipe 4A having an opening surrounding the drilling guide rail 3 is then mounted as shown in FIG. Connecting.

This temporary bypass duct connecting pipe 4A is
In detail, as shown in FIG. 5, it is a square tube having a structure including a back sealing plate 4B detachable from the back side opening.
11 ... and a daylighting window 1 on the top
And a packer first insertion / removal hole 4 on one side surface.
a through a short pipe 13 for mounting a shutoff valve provided in communication with a.
For example, a gate type shutoff valve 14 is provided. An insertion guide tube 5 serving as a guide when a packer insertion / rewinding device 6 described later is inserted into the temporary bypass duct connection tube 4A can be detachably connected to the shut-off valve 14. I have.

The rear sealing plate 4B is provided with connecting angles 16, 16... Around the outer surface side of the sealing plate main body 15, is provided with a daylighting / viewing window 17, and is continuous with a pair of left and right arm insertion holes 15a, 15b. A glove-shaped arm insert 18 is provided. Further, a cable through hole 15c for inserting a power cable of the plasma torch 10 is formed.

On the other hand, the packer insertion / rewinding device 6 inserted from the insertion guide tube 5 into the temporary bypass duct connecting tube 4A has an opening 19a on a side portion, as shown in detail in FIG. The packer winding shaft 20 includes an outer cylinder 19 and a packer winding shaft 20 inserted into the outer cylinder 19.
2 and 23 are provided integrally, and the packer winding shaft 20 is held substantially at the center when inserted into the outer cylinder 19. In addition, a packer winding shaft 20 is provided at the end on the hand side.
A handle 21a is provided to rotate the shaft around the axis.

One end of a plurality of ropes 24 is connected to the packer winding shaft 20.
A balloon-shaped packer 26 is connected to the other ends of the. The packer 26 is made of a suitable sheet material such as canvas cloth, nylon cloth, polyester cloth, glass cloth, carbon cloth, or the like, and is sewn into a cubic shape according to the internal shape of the temporary bypass duct connection pipe 4A. As shown in FIG. 7, inside the bag, facing walls are connected by a plurality of shape maintaining ropes 27, 27,. Is provided with an air supply / exhaust nozzle 28 to which the air supply / discharge pipe 25 is connected. The packer insertion / rewinding device 6 removes air from the packer 26, rotates the packer rewind shaft 20 in one direction, and
6 is wound up and inserted into the outer cylinder 19.

When the connection pipe 4A for the temporary bypass duct is completely connected to the existing duct 1, as shown in FIG. 8, the arm is inserted through the arm insertion holes 15a, 15b of the rear sealing plate 4B, and the cable is inserted. Plasma torch 1 inserted into temporary bypass duct connecting pipe 4A through through hole 15c
9A, the torch head 10a is moved along the guide rail 3 for perforation, and as shown in FIG.
To form As shown in FIG. 9 (B), the cut piece 1a has been moved to the side of the rear sealing plate 4B of the temporary bypass duct connection pipe 4A.

Next, according to the procedure shown in FIG. 10, the flow path of the connecting pipe 4A for the temporary bypass duct is temporarily closed by the packer insertion / rewinding device 6, and the rear sealing plate 4 is closed.
B is removed and the temporary bypass duct 2 is installed. First, the insertion guide tube 5 is connected to the shutoff valve 14,
The shut-off valve 14 is fully opened, and the packer insertion / winding device 6 is inserted through the opening of the insertion guide tube 5. When the insertion is completed, as shown in FIG.
Is removed, air is supplied into the packer 26 through the air supply / discharge pipe 25 while rotating the packer take-up shaft 20 in the direction in which the packer 26 is deployed, and the packer 26 is inflated to flow through the connection pipe 4A for the temporary bypass duct. Block the road. Thereafter, as shown in FIG.
The sealing plate 4B and the cut piece 1a are removed in a state where the connection pipes 4A and 4A are temporarily closed.
The temporary bypass duct 2 connecting the 4A to each other is attached.

When the installation of the temporary bypass duct 2 is completed, the operation of removing the packer insertion / rewinding device 6 is then performed, and the existing duct flow path is switched to both the existing duct 1 and the temporary bypass duct 2. . Specifically, as shown in FIG. 12, after the air is discharged from the packer 26 and the packer winding shaft 20 is rotated to wind the packer 26 into the outer cylinder 19, the insertion guide tube 5
Is attached, and the packer insertion / rewinding device 6 is pulled out from the first packer insertion / removal hole 4a. Then, the shut-off valve 14 is fully closed, and the packer insertion / rewinding device 6 is inserted together with the insertion guide tube 5.
, The closing plate 29 is attached to the shutoff valve 14.

[II. Step of switching the flow path from the existing duct 1 to the temporary bypass duct 2] When the simultaneous installation of the temporary bypass duct 2 is completed by the above-mentioned step I, the flow path of the renewal section of the existing duct 1 is closed and the flow path is temporarily bypassed. Switch to Duct 2 side.

First, as shown in FIG. 13, on the existing duct 1 side, connection pipes 4A, 4A for temporary bypass ducts.
And a short pipe 13 for mounting a shut-off valve, and a gate-type shut-off valve 14 is provided continuously with the short pipe 13 for mounting the shut-off valve. Attach the drilling machine 7 as shown at 14. As shown in FIG. 15, the drilling machine 7 is rotatable about an axis by a rotary motor 32 and has a structure in which a drill bit 31 is provided at the tip of a drill rod 30 supported by a propulsion guide 34. And the drill bit 3
1 is attached via an evacuation tube 35 for evacuation. When the shut-off valve 14 is fully opened and the packer second insertion / removal hole 1b is formed in the existing duct 1 by propelling the drill rod 30 supported by the propulsion guide 34, the drill bit 31 is retracted to the evacuation pipe 35, Shutoff valve 1
By completely closing 4, the packer second insertion / removal hole 1 b can be formed in the existing duct 1 without leaking the gas flowing down in the existing duct 1 to the outside. In addition,
Reference numeral 33 denotes a stopper when the drill rod 30 is propelled.

After the second insertion hole 1b of the packer communicating with the shut-off valve 14 is formed in the existing duct 1, the drilling machine 7 is removed, and the insertion guide tube 5 is attached to the shut-off valve 14 as shown in FIG. At the same time, the packer insertion / rewinding device 6 is inserted from the insertion guide tube 5, and as shown in FIG. 17, the packer is inserted into the existing duct 1 in accordance with the procedure for forming the packer in the temporary bypass duct connection pipe 4A. By providing 26, 26, the duct flow path in the update range L is blocked, and the flow path in this update range L section is switched to the temporary bypass duct 2 side.

[III. Step of Updating Existing Duct 1] If packers 26, 26 are installed on both sides of the existing duct 2 across the renewal range L in the step II, respectively, as shown in FIG. 26, 26, the existing duct 1 is cut off, and then, as shown in FIG.
Attach 6,36. Thereafter, the closing plates 36, 36 are removed, and the new duct 8 is inserted and installed in the renewal range L as shown in FIG.

[IV. Step of Switching the Flow Path from the Temporary Bypass Duct 2 to the New Duct] When the update to the new duct 8 is completed, the flow path is changed from the current temporary bypass duct 2 side to the existing duct 1 side. I will put it back.

As shown in FIGS. 20 and 21, after the air is discharged from the packer 26, the packer winding shaft 20 is turned off.
Is rotated to wind up the packer 26 into the outer cylinder 19, the insertion guide tube 5 is attached, and the packer second insertion / removal hole 1 is inserted.
b, the packer insertion / rewinding device 6 is pulled out. When the shut-off valve 14 is fully closed and the packer insertion / rewinding device 6 is removed together with the insertion guide tube 5, the shut-off plate 37 is attached to the shut-off valve 14.

Next, as shown in FIG. 22, the insertion guide tube 5 is attached to the temporary bypass duct connection pipe 4A again, and the packer insertion / rewinding device 6 is inserted into the temporary bypass duct connection pipe 4A. Packer 26 again
To block the flow path of the temporary bypass duct 2 and switch the flow path from the temporary bypass duct 2 to the existing duct 1 side.

[V. Removal process of temporary bypass duct 2]
In a state where the packer 26 is provided inside the connecting pipe 4A for the temporary bypass duct, and the flow path is switched to the existing duct 1, the temporary bypass duct 2 is removed as shown in FIG. A rear sealing plate 4B is attached to 4A to close the opening on the rear side. Thereafter, when air is discharged from the packer 26 and the packer winding shaft 20 is rotated to wind the packer 26 into the outer cylinder 19, the insertion guide tube 5 is attached, and the packer first insertion / removal hole 4a is inserted.
Then, the packer insertion / winding device 6 is pulled out. Then, the shut-off valve 14 is fully closed, the packer insertion / rewinding device 6 is removed together with the insertion guide tube 5, and the shut-off valve 14 is closed.
Attach 9 to complete all operations.

Although the method of updating the existing duct has been described in detail above, the present method can be variously modified in each step other than the method shown in the above specific example. For example, in forming a packer in the connection pipe 4A for the temporary bypass duct, the packer insertion / rewinding device 6 is used in this example, but as shown in FIG. 24, the gate valve is directly connected to the connection pipe 4A for the temporary bypass duct. It is also possible to provide a gate-type packer device 39 that can open / close the flow path by moving it. In addition, existing duct 1
In the present embodiment, the plasma torch 10 is cut directly by hand in the formation of the distribution port 1c with respect to the circulating port 1c. The distribution port 1c may be formed with one button.

[0034]

As described above, according to the present invention, the existing duct can be replaced without stopping the air conditioning / ventilation function at all.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory diagram of a method of updating an existing duct.

FIGS. 2A and 2B show how to attach a drilling guide rail 3 to an existing duct 1; FIG. 2A is a plan view and FIG.

FIG. 3 is a diagram showing a drilling procedure by the drilling guide rail 3;

FIG. 4 is a view showing a state where the perforating work box 4 is attached to the existing duct 1;

FIG. 5 is an exploded perspective view of the boring work box 4.

6 is an exploded perspective view of the packer insertion / rewind device 6. FIG.

7A is a front view, and FIG. 7B is a plan view, showing the packer 26. FIG.

FIG. 8 is a diagram showing a procedure for cutting a bypass circulation port.

FIG. 9 is a view showing how to handle the cut piece 1a.

FIG. 10 is a view showing how to form a packer 26 in a connection pipe 4A for a temporary bypass duct.

FIG. 11 is a view showing how to attach a temporary bypass duct 2;

FIG. 12 is a diagram showing a removal procedure of the packer 26 in the temporary bypass duct connecting pipe 4A.

FIG. 13 is a diagram (part 1) illustrating a procedure for forming a packer insertion / removal hole 1b in the existing duct 1.

FIG. 14 is a diagram (part 2) illustrating a procedure for forming a packer insertion / removal hole 1b in the existing duct 1.

FIG. 15 is a schematic structural view of a drilling machine 7 used at that time.

FIG. 16 is a view (part 1) illustrating how to attach a packer 26 to an existing duct 1.

FIG. 17 is a view (part 2) illustrating how to attach the packer 26 to the existing duct 1.

FIG. 18 is a drawing showing a removal procedure of the existing duct 1.

FIG. 19 is a view showing how to attach a new duct 8;

FIG. 20 is a diagram (part 1) illustrating how to remove a packer from an existing duct 1.

FIG. 21 is a diagram (part 2) of a procedure for removing a packer from an existing duct 1.

FIG. 22 is a view showing how to form a packer in a temporary bypass duct connection pipe 4A.

FIG. 23 is a removal procedure diagram of the temporary bypass duct 2.

FIG. 24 is a view showing a modified example of the packer device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Existing duct, 1a ... cut piece, 1b ... Packer 2nd insertion / removal hole, 1c ... Distribution port, 2 ... Temporary bypass duct, 3 ... Perforation guide rail, 4A ... Temporary bypass duct connection pipe, 4a ... Packer 1 Insertion / removal hole, 4B ... back sealing plate, 5
... Insertion guide tube, 6 ... Packer insertion / rewinding device, 7 ... Punch, 8 ... New duct, 10 ... Plasma torch, 13 ...
Short pipe for mounting a shut-off valve, 14 ... shut-off valve, 19 ... outer cylinder, 20 ...
Packer winding shaft, 25 ... Air supply / discharge tube, 26 ... Packer

Claims (4)

[Claims] 1. A method of updating an existing duct in which a temporary bypass duct is provided in a section straddling an update range of an existing duct and a duct in the update range is replaced while a flow path is switched to the temporary bypass duct. A connecting pipe for the temporary bypass duct, which is provided with a back sealing plate for closing the opening on the rear side, is connected to the connecting portion of the temporary bypass duct, and the connecting pipe for the temporary bypass duct is connected within the closed space of the connecting pipe for the temporary bypass duct. After cutting the wall surface of the existing duct to form a circulation port to the temporary bypass duct, a packer for closing the flow path is provided inside the temporary bypass duct connection pipe, and then the rear blocking plate is removed to remove the temporary bypass duct connection pipe. A first step of providing a temporary bypass duct connecting between the pipes; and removing the packers provided in the connection pipes for the respective temporary bypass ducts; Husband exosite of preparative update range s, provided the packer for closing the flow passage inside the existing duct, a second to switch the duct flow path to the temporary bypass duct side
A step of removing the existing duct in the renewal range sandwiched between the pair of packers provided in the existing duct, and installing a new duct in the renewal range, and a packer provided in the existing duct. After removing each one,
In the connecting pipe for the temporary bypass duct, a packer is provided again inside the connecting pipe for the temporary bypass duct, and the flow path to the temporary bypass duct is blocked and switched to the existing duct side.
A fifth step of removing the temporary bypass duct, attaching a rear sealing plate to a rear opening of the temporary bypass duct connection pipe, and removing a packer in the temporary bypass duct connection pipe. How to update existing ducts. 2. A method of updating an existing duct, wherein a temporary bypass duct is provided in a section straddling an update range of an existing duct, and a duct in the update range is replaced while the flow path is switched to the temporary bypass duct. A packer first insertion / removal hole is provided at a connection portion of the temporary bypass duct so that an external communication hole can be opened and closed by a shutoff valve, and a back sealing plate for closing a back side opening is detachably provided. After connecting the connecting pipe for the temporary bypass duct and cutting the wall surface of the existing duct in the closed space of the connecting pipe for the temporary bypass duct to form a flow opening to the temporary bypass duct, the first insertion / removal hole of the packer is removed. A packer for closing the flow path is provided inside the connecting pipe for the temporary bypass duct by utilizing the same, and then the rear sealing plate is removed to connect the connecting pipe for the temporary bypass duct. A first step of providing a temporary bypass duct, and after removing the packers provided in the connection pipes for the respective temporary bypass ducts from the first insertion / removal holes of the packers, externally by a shut-off valve to a portion outside the existing duct update range. The packer has a second insertion / removal hole whose communication hole is freely openable and closable, and a packer for closing a flow passage inside the existing duct is provided by using the second insertion / removal hole of the packer. A second step of switching to the side, a third step of removing an existing duct in an update range sandwiched between a pair of packers provided in the existing duct, and installing a new duct in the update range, After removing the packers provided in each of the packers from the second insertion / removal holes of the packer, the connection pipes for the temporary bypass duct are again used by using the first packer / removal holes. A fourth step of providing a packer inside the connection pipe for the temporary bypass duct, blocking the flow path to the temporary bypass duct, and switching to the existing duct side, and removing the temporary bypass duct, and the rear side of the connection pipe for the temporary bypass duct. A fifth step of attaching a rear sealing plate to the opening and removing a packer in the temporary bypass duct connecting pipe from the first insertion / removal hole of the packer. 3. The packer is a balloon-like packer which can be expanded and contracted by supplying and discharging a fluid, and is inserted into a duct through a packer insertion / removal hole while being folded with respect to a take-up shaft. 3. The method for updating an existing duct according to claim 2, wherein the packing duct function is exhibited by expansion, and is contracted by fluid discharge at the time of removal, and is removed from the packer insertion / removal hole while being wound up by the winding shaft. 4. A perforated guide rail, which serves as a guide when the cutting device is run, in forming a flow port to the temporary bypass duct in the temporary bypass duct connection pipe closed by the rear sealing plate. On the other hand, an arm insertion hole is formed in the rear sealing plate, and a glove-shaped arm insertion body is provided inside the box continuously to the arm insertion hole, and a hand is inserted through the arm insertion hole,
The method for renewing an existing duct according to any one of claims 1 to 3, wherein the distribution port is formed in a side surface of the existing duct by directly grasping the cutting device and moving the cutting device along the guide rail for perforation. .