JP2005104646A - Rubber expansion tube unit, and method for manufacturing rubber expansion tube used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber expansion tube unit which is easily inserted in a narrow space, and capable of pressing an object with a uniform pressure over a predetermined area range. <P>SOLUTION: A plurality of rubber expansion tubes 12 in which one end in the longitudinal direction of a rubber hose 16 of a flat shape after vulcanization is closed, and an end piece 22 having an air feed port fitted to the other end in the longitudinal direction are arranged in parallel, and assembled to each other to form an integrated rubber expansion tube unit 10. The unit is inserted in a predetermined space, and each rubber expansion tube 12 is expanded from a flat shape to press the object in the inserted condition by feeding air. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rubber expansion tube unit, and more particularly to a rubber expansion tube unit suitable for being inserted into a gap and expanding a rubber expansion tube by supplying a fluid to press an object.

Conventionally, rubber has been closed in a bag shape to form an inflatable bag, and a fluid such as air is introduced into the inside at a predetermined pressure to inflate the inflatable bag and be used as a jack for lifting an object. .
FIG. 12 shows a specific example thereof, in which 200 is a cushion-like inflatable bag made of a rubber bag.
The expansion bag 200 is provided with a fluid supply port 202.
In the case of the inflatable bag 200, when the fluid is supplied to the inside through the supply port 202, the entire inflatable bag 200 is inflated and lifts the object by the pressure.

This kind of thing used as a jack etc. is disclosed also in the following patent document 1, for example.
However, when the inflatable bag 200 is inflated by supplying a predetermined fluid such as air, the central portion of the bag (the inflatable bag 200) is inflated more than the other (FIG. 12C). Since this is a single bag, there is a problem that it is difficult to press the object evenly over a predetermined area range.

In addition, this is particularly unsuitable for insertion into a narrow gap.
For example, conventionally, a tunnel is excavated by a shield method using a shield machine, and in this shield method, as shown in FIG. The segment 208 is connected in the circumferential direction to form a cylindrical assembly 210, which is connected one after another in the traveling direction of the shield machine to secure the space in the tunnel against the earth pressure and water pressure of the ground 204 The inner wall of the tunnel 208 is constructed, and at this time, the segment 208 is hung down by the earth pressure or its own weight, and the assembly 210 of the segments 208 connected in a cylindrical shape is shown in FIG. ) May become slightly flat as shown in FIG.

The fact that the cylindrical assembly 210 has a slightly flat shape, that is, a shape that deviates from a perfect circle shape means that there is a backlash or a gap at the connecting portion of each segment 208, and that Even when the shaped assembly 210 is connected back and forth, the connection cannot be performed well.
This is not desirable, and in such a shield method, the cylindrical assembly 210 formed by connecting the segments 208 in the circumferential direction is corrected to a perfect circle shape and held in the same shape. It is fixed to the surrounding ground 204 by injecting.

Patent Document 2 below discloses an apparatus for that purpose, that is, an apparatus for correcting and holding a cylindrical assembly 210 formed by connecting segments 208 in the circumferential direction into a perfect circle.
However, this device is very large and expensive, and this device is installed in the tunnel space, that is, the inner space of the cylindrical assembly 210. There is a problem of coming.

In this case, a clearance 212 between the cylindrical and steel outer plate (skin plate) 206 (see FIG. 13A) in the shield machine and the cylindrical assembly 210 of the segment 208 (see FIG. 13B). 12), an inflatable bag 200 as shown in FIG. 12 is inserted, and by inflating the inflatable bag 200, the position of the segment 208 is shifted to correct the shape of the assembly 210 and hold it in a perfect circle shape. One method is considered, but this gap 212 is an extremely narrow gap, and there is a problem that the inflatable bag 200 as described above cannot be inserted into the narrow gap 212.
Moreover, even if it can be inserted, since the central portion of the inflatable bag 200 is inflated more than the other, it is difficult to press the segment 208 with a uniform pressure over a wide area range. There is.

Japanese Utility Model Publication No. 2-139890 JP 2001-254599 A

  In view of such circumstances, the present invention provides a rubber expansion tube unit that can be easily inserted into a narrow gap and can press an object with a uniform pressure over a predetermined area range. It was made as a purpose.

  Thus, the rubber expansion tube unit of the present invention is provided with an end member having a fluid supply port at the other end in the longitudinal direction while closing one end in the longitudinal direction of the rubber hose having a flat shape after vulcanization. A plurality of rubber expansion tubes arranged in parallel and assembled to each other to form an integral unit, which is inserted into a predetermined gap and supplied with the fluid in the inserted state so that the rubber expansion tube is formed into the flat shape. It is made to inflate and press an object (Claim 1).

  According to a second aspect of the present invention, in the first aspect, the plurality of rubber expansion tubes are connected to each other by connecting members at the end members.

  According to a third aspect of the present invention, in the second aspect, the connecting member connects the supply ports of the end members of the plurality of rubber expansion tubes to each other in a communicating state, and is sent from a supply source. It is a connection pipe that divides a fluid and distributes and supplies the fluid to the rubber expansion pipes in common through the end members.

  According to a fourth aspect of the present invention, in the third aspect, the connection pipe is a flexible pipe.

  According to a fifth aspect of the present invention, in any one of the third and fourth aspects, the connecting pipe and each end member are detachably coupled by a coupler.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the rubber expansion tube unit extends from the closing side of the rubber expansion tube, which is an insertion side into the gap, to a position in the vicinity of the end member. The overall thickness is as thin as 20 mm or less.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the rubber expansion tube unit is for correcting a shape of a segment that constructs an inner wall of a tunnel in a shield method using a shield machine. And

  According to an eighth aspect of the present invention, in any one of the first to seventh aspects, on the surface of the rubber hose, a sliding sheet made of a highly slidable member having a lower coefficient of friction than the rubber hose and easily slipping on the object. It is characterized by being attached.

  A ninth aspect relates to a method of manufacturing a rubber expansion tube according to any one of the first to eighth aspects, wherein an unvulcanized product of the rubber hose formed in a cylindrical shape around a mandrel is held in the cylindrical shape. In this state, the primary vulcanization is performed, and then the primary vulcanized product is extracted from the mandrel and restrained in a flat shape to perform secondary vulcanization, and after or before the secondary vulcanization, One end of the longitudinal direction is closed and the end member is attached to the other end.

Effects and effects of the invention

As described above, the present invention is a rubber expansion formed by closing one end in the longitudinal direction of a rubber hose having a flat shape after vulcanization and mounting an end member having a fluid supply port at the other end. A plurality of tubes arranged in parallel and assembled together to form an integral rubber expansion tube unit. In the rubber expansion tube unit of the present invention, a plurality of rubber expansion tubes are expanded to press an object. From the above, each rubber expansion pipe can be configured with a small size (dimension in a direction perpendicular to the flat direction), and each rubber expansion pipe, more specifically, each rubber hose has a flat shape. The unit thickness can be significantly reduced.
Therefore, in the case of the rubber expansion pipe unit of the present invention, it is possible to insert it into an extremely narrow gap.

  For example, in the case of the rubber expansion tube unit of the present invention, the entire thickness from one end portion on the closing side of the rubber expansion tube to the vicinity of the end member on the other end portion can be reduced to 20 mm or less (claims). 6) Therefore, in this case, the rubber expansion tube unit can be easily inserted into an extremely narrow gap having a gap of 20 mm or less.

Thus, when a fluid such as air is supplied to the rubber expansion tube and expanded, each rubber expansion tube can be expanded evenly. Therefore, according to the present invention, the object can be expanded over a wide area range. It is possible to press this with equal pressure by each rubber expansion tube.
That is, when an inflatable bag made up of a single bag as shown in FIG. 12 is used, the center portion of the inflated bag is inflated more than the other, and the object can be pressed evenly over a wide area range. Although it is difficult, in the case of the rubber expansion pipe unit of the present invention, since a plurality of rubber expansion pipes cooperate to press the object as a whole, it is possible to press the object with equal pressure. That's it.

Here, the plurality of rubber expansion tubes can be connected to each other by a connecting member at each end member (claim 2).
Further, the connecting member can be a connecting pipe which branches the fluid sent from the supply source and distributes and supplies the fluid to the rubber expansion pipe through each end member.

That is, the connecting member can be used both as a connecting member for connecting the rubber expansion tubes and as a supply tube for supplying a fluid in common to the rubber expansion tubes.
In this way, it is possible to obtain an advantage that the number of necessary parts can be reduced and the configuration of the rubber expansion tube unit can be simplified.

In this case, the connection pipe can be a flexible pipe.
If the connecting pipe is a flexible pipe in this way, each rubber expansion tube can be easily inserted into such a gap by bending the flexible pipe even for a curved gap. In addition, by supplying the fluid, it can be expanded within the curved gap to press the object without any trouble.

The connection pipe can be detachably connected to each end member by a coupler (Claim 5).
The rubber expansion pipe unit of the present invention can be used as a jack for lifting a heavy object or for various other uses, particularly for shape correction of a concrete or iron segment for constructing an inner wall of a tunnel in a shield method. (Claim 7).

In the rubber expansion tube unit of the present invention, a sliding sheet made of a highly slidable member having a low coefficient of friction and easy to slide with respect to the object can be adhered to the surface of the rubber hose.
In this way, the rubber expansion tube unit can be easily inserted into a narrow gap by the sliding sheet, and the object is expanded under a state where the rubber expansion tube is expanded and the object is pressed. In contrast, the rubber expansion tube unit can be smoothly slid.
Here, a sheet of Teflon or nylon can be used as the sliding sheet.

  Claim 9 relates to a method of manufacturing each rubber expansion tube in the rubber expansion tube unit. In this manufacturing method, an unvulcanized product of a rubber hose is formed in a cylindrical shape around a mandrel, and the unvulcanized product Is held in a cylindrical shape, and then first vulcanized, and then the primary vulcanized product is extracted from the mandrel and constrained to a flat shape to perform secondary vulcanization. After or before, one end of the longitudinal direction is closed and the end member is attached to the other end. In this manufacturing method, a cylindrical primary vulcanized product is first manufactured and then flattened. Since restraint and secondary vulcanization are performed, workability is better than when a flat rubber expansion tube, specifically a rubber hose, is formed and vulcanized in one step, and the final shape is improved. Can be molded and vulcanized.

For example, after adjusting the shape to some extent by primary vulcanization, but not forming the final flat shape by secondary vulcanization, if you try to form a flat shape by one vulcanization, the unvulcanized rubber will be Since it tends to fluctuate in the width direction and the thickness direction, it is difficult or complicated to constrain the rubber hose to a flat shape, and variations are likely to occur.
Also, after vulcanizing in a cylindrical shape, it is impossible to maintain a flat shape over the entire length even if it is held in a flat shape just by closing one end portion. Need to be provided.

Next, embodiments of the present invention will be described in detail below with reference to the drawings.
In FIG. 1, reference numeral 10 denotes a rubber expansion pipe unit, and this rubber expansion pipe unit 10 is configured by connecting a plurality (three in this case) of rubber expansion pipes 12 by connecting pipes 14.

3 and 4 specifically show the configuration of the rubber expansion tube 12.
In these drawings, reference numeral 16 denotes a rubber hose constituting the main body of the rubber expansion tube 12, and this rubber hose 16 has a laminated structure of an inner rubber layer 16-1, a reinforcing layer 16-2 and an outer rubber layer 16-3. .
Here, the reinforcing layer 16-2 is a reinforcing yarn obtained by braiding a spiral braid or a braid.

The rubber hose 16 has a flat shape from one end in the longitudinal direction to the other end, that is, over the entire length.
Figure 5 shows its cross-sectional shape, the rubber hose 16 in this embodiment as shown in figure results in its entirety is a flat shape, thickness T ₁ is significantly thinner relative to the width dimension W ing.
Width W in this embodiment is 100 mm, thickness _{T 1} contrast is 10 mm.

As shown in FIGS. 3 and 4, one end in the longitudinal direction of the rubber hose 16 is closed by a pair of plate-shaped presser fittings 18, fastening bolts 20, and nuts 21.
Here retainer fitting 18 and the fastening bolts 20, the total thickness _{T 2} including nut 21 is 18 mm.
An end fitting 22 is attached to the other end in the longitudinal direction opposite to the closed side.
The end fitting 22 has a cylindrical insertion portion 24, and the insertion portion 24 is inserted into the rubber hose 16.

Reference numeral 26 denotes a ring-shaped tightening bracket. The end of the rubber hose 16 is tightened radially inward by the tightening bracket 26, so that the end bracket 22 and the end of the rubber hose 16 are joined together with the tightening bracket 26. The rubber hose 16 is fixed to the end of the rubber hose 16 in a state of being sandwiched from both the inside and outside.
The end fitting 22 is provided with an air supply port 28 (see FIG. 3B). Further, a female coupler 30 for connection to the connection pipe 14 is provided.

Note the rubber inflation tube 12 is an overall length dimension (full-length) _{L 1} is 1000 mm, and the length dimension _{L 2} of the insertion portion 24 of the end fitting 22 is 65 mm.
In other words, the rubber expansion tube 12 has a cylindrical shape at the portion where the insertion portion 24 of the end fitting 22 is inserted, but most of the rubber expansion tube 12 has a flat shape with a small thickness.
A teflon sheet (sliding sheet) 32 is adhered to the flat upper surface of the rubber hose 16 with an adhesive over a predetermined length.

As shown in FIG. 2, the connection pipe 14 is provided with elbows 34 at both ends and a cross joint 36 at the center, and a male coupler 38 projects from each.
The three male couplers 38 are coupled to the female couplers 30 of the end fittings 22 of the three rubber expansion tubes 12 so as to be coupled, that is, detachable.

  That is, the connection pipe 14 connects the supply ports 28 of the end fittings 22 in the rubber expansion pipes 12 in communication with each other, branches the air sent from the supply source, and connects the supply pipes 28 through the end fittings 22. Distribute and feed into the rubber expansion tube 12.

  The connecting pipe 14 also serves as a connecting member for connecting the rubber expansion tubes 12 to each other, and the three rubber expansion tubes 12 are respectively attached with longitudinal ends on the same side, that is, end fittings 22. At the end on the other side, the connecting pipes 14 are connected in parallel to each other, and together with the connecting pipe 14, the integral rubber expansion pipe unit 10 is configured.

A valve 40 and a male coupler 38 protrude from the cross joint 36 at the center of the connection pipe 14, and the male coupler 38 is connected to the female coupler 30 of the air supply pipe 42. .
Air from the supply source is sent through the supply pipe 42, branched in three directions at the connection pipe 14, and distributed and supplied to each of the three rubber expansion pipes 12.

6 and 7 show an example of a method for manufacturing the rubber expansion tube 12 in the rubber expansion tube unit 10 in the order of steps.
In this manufacturing method, first, an unvulcanized rubber hose is wound around a mandrel 44 having a circular cross section.
Then, in the primary vulcanization step of FIG. 6 (I), this is primary vulcanized in a vulcanizing furnace.
In this primary vulcanization, the cylindrical unvulcanized product 16A is brought into a semi-vulcanized state.

Next, this is flattened in the flattening step of FIG.
Specifically, here, the cylindrical primary vulcanized product 16A is pressed using two iron plates 46, and this is formed into a flat shape.
Next, in the secondary vulcanization step of FIG. 7 (III), this is secondary vulcanized in a vulcanizing furnace.

  7 (IV), one end in the longitudinal direction of the rubber hose 16 after the secondary vulcanization is closed with a pair of presser fittings 18, fastening bolts 20, and nuts 21, and an end portion is provided at the other end. After the fitting 22 is inserted, the fastening fitting 26 is tightened to fix the end fitting 22 to the end of the rubber hose 16.

The manufacturing method described above is suitable for manufacturing a rubber expansion tube 12 having a medium diameter, but when the rubber expansion tube 12 has a large diameter, a flat shape is preferable by the method shown in FIG. .
As shown in the drawing, the end member 50 for suction is attached to the cylindrical primary vulcanized product 16 </ b> A and the inside is vacuum-sucked, and this is constrained to a flat shape by the iron plate 48.
In this state, the secondary vulcanization is completed by heating for a predetermined time while maintaining the restrained state in the next secondary vulcanization step.

FIG. 9 shows an example of flattening suitable for the case where the rubber expansion tube 12 has a small diameter. Here, as shown in the figure, a cylindrical primary vulcanized product 16A is wound around a mandrel 52 having a large diameter. Flatten.
In this state, the primary vulcanized product 16A that has been flattened by wrapping the cloth tape 54 around the outer peripheral side is constrained to the flat shape, and in this state, this is heated for a predetermined time in the next secondary vulcanization step. Then, the secondary vulcanization is completed.

10 and 11 show an example of use of the rubber expansion tube unit 10.
This example is an example used for correcting the shape of a segment for constructing the inner wall of a shield tunnel in a shield method using a shield machine.

  In FIG. 10, 55 is a ground around the tunnel, 56 is a cylindrical and steel outer plate in the shield machine, and 58 is a space for securing the tunnel inner space against the earth pressure and water pressure of the ground 55 around the tunnel. Are arc-shaped concrete segments constituting the inner wall of the cylinder, 60 is a cylindrical assembly formed by connecting the segments 58 in the circumferential direction, and 62 is a gap formed between the segment 58 and the outer plate 56. .

The cylindrical assembly 60 formed by connecting the segments 58 in the circumferential direction has a shape in which the entire shape deviates from a perfect circle by being slightly hung downward by earth pressure or its own weight. There may be a flat shape as shown by the middle two-dot chain line.
Therefore, here, the rubber expansion tube unit 10 is used to correct the shape into a perfect circle and to maintain the shape.

Specifically, here, the rubber expansion pipe unit 10 is inserted into the gap 62 between the segment 58 and the outer plate 56 at four locations in the circumferential direction, and air is supplied to the rubber expansion pipe 12 to expand it. By doing so, the segment 58, specifically, the cylindrical assembly 60 is pressed from the left and right directions, and the shape of the flat assembly 60 is corrected to a perfect circle.
FIG. 11 shows the specific procedure.

First, as shown in FIG. 11 (I), the rubber expansion tube unit of this embodiment is formed in a minute gap 62 between the cylindrical assembly 60 on the left side of the newly assembled figure and the outer plate 56 of the shield machine. 10 is inserted.
At this time, the rubber expansion tube unit 10 is inserted into the gap 62 from one end portion on the closing side of each rubber expansion tube 12.
At this time, the rubber expansion tube 12 is inserted into the gap 62 with the surface to which the Teflon sheet 32 is adhered facing the segment 60 side.
When the rubber expansion tube unit 10 is inserted into the gap 62, another Teflon sheet 32 is superimposed on the Teflon sheet 32 adhered to the rubber expansion tube 12, and the rubber expansion tube unit 10 is placed in the gap 62 in this state. insert.

In this state, as shown in FIG. 11 (II), air is supplied into each rubber expansion tube 12 of the rubber expansion tube unit 10 to expand them from a flat shape.
By this expansion, the segment 58 is pressed by the air pressure, and moves to a small distance position toward the tunnel center side.
Then, the air pressure in each expansion tube unit 10 is adjusted so that the assembly 60 has a perfect circular shape, and the shape of the assembly 60 distorted into a flat shape is corrected, and the shape is held in its perfect circular shape. .
In this state, the shield machine moves forward (see FIG. 11 (III)).

At this time, each rubber expansion tube unit 10 has a large friction coefficient because the rubber hose 16 directly contacts the outer plate 56, and the other side is in contact with the segment 58 via two teflon sheets 32 having good slippage. As the shield machine advances (digs up), each segment 58 whose shape has been corrected to a perfect circle by the plurality of rubber expansion tube units 10 is kept in the shape of a perfect circle by the rubber expansion tube units 10 and is the outer plate. It moves relative to 56 in the right direction in the figure.
When the newly assembled assembly 60 reaches the tail seal portion 56A of the outer plate 56, grout is injected between the segment 58 and the ground 55, and the assembly 60 is fixed to the inner surface of the ground 55.

  Since the rubber expansion tube unit 10 of the present example as described above expands the three rubber expansion tubes 12 and presses the object, each rubber expansion tube 12 can be configured with a small size. Moreover, since each rubber hose 16 constituting the main body of each rubber expansion pipe 12 has a flat shape, the thickness of the rubber expansion pipe unit 10 can be remarkably reduced, and this can be inserted into a very narrow gap. Can do.

Further, when air is supplied to the rubber expansion tubes 12 to expand them, each rubber expansion tube 12 can be expanded uniformly, so that the object can be evenly distributed over the wide area range by each rubber expansion tube 12. It can be pressed with pressure.
That is, in this example, since the three rubber expansion tubes 12 cooperate to press the object as a whole, the object can be pressed with an equal pressure.

  Further, in this example, the connection pipe 14 has both a function as a connecting member for connecting the rubber expansion pipes 12 and a function as a supply pipe for supplying air to the rubber expansion pipes 12 in common. Therefore, the number of necessary parts can be reduced and the configuration of the rubber expansion tube unit 10 can be simplified.

  In this case, if the connection pipe 14 is a flexible pipe as shown by a two-dot chain line in FIG. 2B, each connection pipe 14 is bent even with respect to a gap having a curved surface. The rubber expansion tube 12 can be easily inserted, and it can be expanded in a curved gap by supplying air to press the object without any trouble.

  Furthermore, according to the rubber expansion tube unit 10 of this example, since the Teflon sheet 32 having a low coefficient of friction and slippery on the object is adhered to the surface of the rubber hose 16, the rubber expansion tube unit is provided by the Teflon sheet 32. 10 can be easily inserted into a narrow gap, and the rubber expansion tube unit 10 can be smoothly slid relative to the object under a state in which the rubber expansion tube 12 is expanded to press the object. it can.

  In addition, according to the method for manufacturing the rubber expansion tube 12 of this example, the cylindrical primary vulcanized product 16A is first manufactured and then constrained to a flat shape to perform secondary vulcanization. Compared with the case of molding and vulcanizing the rubber expansion tube 12 having a shape, specifically, the rubber hose 16, the workability is good and it can be molded and vulcanized into a good final shape.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured and implemented in various forms and modes without departing from the spirit of the present invention.

It is a figure which shows the rubber expansion pipe unit of one Embodiment of this invention. It is a figure which shows centering on the connection pipe in FIG. It is a figure which shows the rubber expansion tube in FIG. It is a figure which decomposes | disassembles and shows the rubber expansion pipe | tube shown in FIG. FIG. 4 is a sectional view taken along the line AA in FIG. It is process explanatory drawing which shows an example of the manufacturing method of the rubber expansion pipe | tube of FIG. It is process explanatory drawing following FIG. It is process explanatory drawing which shows the flattening method of the rubber hose different from FIG. 6 (II). It is process explanatory drawing which shows the flattening method of the rubber hose further different from FIG. 6 (II) and FIG. It is explanatory drawing of one usage example of the rubber expansion pipe unit of this embodiment. It is explanatory drawing of the specific procedure in the usage example of FIG. It is a figure which shows the expansion | swelling bag conventionally used as a jack. It is a figure which shows the inside of the tunnel by a shield construction method centering on a segment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rubber expansion pipe unit 12 Rubber expansion pipe 14 Connection pipe 16 Rubber hose 16A Primary vulcanized product 22 End metal fitting (end member)
28 Supply port 30 Female coupler 32 Teflon sheet (sliding sheet)
38 Male coupler 42 Supply pipe 44, 52 Mandrel 58 Segment (object)
62 Clearance

Claims (9)

  A rubber hose having a flat shape after vulcanization is closed at one end in the longitudinal direction, and a plurality of rubber expansion tubes each having an end member having a fluid supply port at the other end in the longitudinal direction are arranged in parallel. Are assembled into an integral unit, and inserted into a predetermined gap, and in the inserted state, the rubber expansion tube is expanded from the flat shape by supplying the fluid to press the object. A rubber expansion tube unit characterized by that.   2. The rubber expansion tube unit according to claim 1, wherein the plurality of rubber expansion tubes are connected to each other by a connection member at each of the end members.   3. The connecting member according to claim 2, wherein the connecting member connects the supply ports of the end members of the plurality of rubber expansion pipes in communication with each other to branch the fluid sent from a supply source. A rubber expansion pipe unit characterized in that it is a connection pipe that distributes and supplies the rubber expansion pipes in common through the end members.   4. The rubber expansion pipe unit according to claim 3, wherein the connection pipe is a flexible pipe.   5. The rubber expansion pipe unit according to claim 3, wherein the connection pipe and each end member are detachably connected by a coupler.   The rubber expansion tube unit according to any one of claims 1 to 5, wherein the rubber expansion tube unit has an overall thickness of 20 mm or less from the closing side of the rubber expansion tube, which is an insertion side to the gap, to a position near the end member. A rubber expansion tube unit that is thin.   7. The rubber expansion pipe unit according to claim 1, wherein the rubber expansion pipe unit is used for shape correction of a segment that constructs an inner wall of a tunnel in a shield method using a shield machine.   In any one of Claims 1-7, the sliding sheet which consists of a highly slidable member with a low friction coefficient lower than this rubber hose and which is easy to slide with respect to the said object is stuck on the surface of the said rubber hose. A rubber expansion tube unit. A method for producing a rubber expansion pipe according to any one of claims 1 to 8,
An unvulcanized product of the rubber hose formed in a cylindrical shape around the mandrel is subjected to primary vulcanization while being held in the cylindrical shape, and then the primary vulcanized product is extracted from the mandrel and then flattened. The rubber expansion pipe is characterized by performing secondary vulcanization while restraining, and closing or attaching the end member to the other end portion after or before the secondary vulcanization. Manufacturing method.

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