JP4231031B2 - Divided collar piece, propulsion pipe, and propulsion pipe assembly comprising the divided collar piece and the propulsion pipe - Google Patents

Description

The present invention relates to a divided collar piece that is arranged in a state of being connected in the circumferential direction and covers a gap portion of the propulsion pipe, a propulsion pipe to which the divided collar piece is attached , and a propulsion pipe assembly comprising the divided collar piece and the propulsion pipe Concerning solids .

    Conventionally, when water and sewage systems, power cables, gas pipes, and the like are laid in the ground, a plurality of propulsion pipes are arranged in series to form a pipeline. The gap between the propulsion pipe and the propulsion pipe is closed by an annular collar.

    Such propulsion pipes must be transported on the road from the manufacturing plant to the burial site, but propulsion pipes with a diameter of more than 3 m are subject to the regulations of the Road Traffic Act and must be transported as they are in the cylindrical shape. Therefore, as shown by reference numeral 100 in FIG. 5, the propulsion pipe is halved (hereinafter referred to as a “divided propulsion pipe piece”) and transported in the state shown in FIG. As shown in FIG. 2, a technique of assembling into a cylindrical shape at an embedding site has been adopted (see, for example, Patent Document 1). FIG. 5 is a schematic diagram showing an example of a state in which the propelling pipe is transported in a state of halving, and FIG. 6 is a schematic diagram showing an example of a state in which a cylindrical propelling pipe is assembled on site. . Moreover, the code | symbol 101 in FIG. 6 shows the crane for lifting the division | segmentation propelling pipe piece 100. FIG.

On the other hand, FIG. 7 is a perspective view showing the external appearance of the cylindrical propulsion tube assembled in such a manner, in which reference numeral 102 denotes an annular collar, and reference numerals 102a and 102b denote half-cut color pieces. Is shown. The collar pieces 102a and 102b constitute an annular collar 102 by welding the circumferential end face 102c and connecting them in the circumferential direction. Further, as shown in FIG. 8, these collar pieces 102 a and 102 b are already embedded in the divided propulsion tube piece 100 at the time when the divided propulsion tube piece 100 in a half state is manufactured in a factory. Note that reference numeral 103 in the figure denotes an anchor bar for embedding the collar pieces 102 a and 102 b in the divided propulsion tube piece 100, and reference numeral 104 denotes a seal member disposed on the entire circumference of the divided propulsion tube piece 100. Reference numeral 105 denotes a cushion material.
JP 2004-183289 A

By the way, in the case of the propulsion pipe as described above,
・ Carrying the divided propulsion pipe piece 100 to the site where the propulsion pipe is buried (see Fig. 5)
・ Production of cylindrical propulsion pipe by connecting divided propulsion pipe pieces 100, 100 (see FIG. 6)
It is necessary to perform a series of operations such as welding of the color pieces 102a and 102b and carrying the completed propelling pipe into the ground, but the welding operator who welds the color pieces 102a and 102b only performs the welding operation. There is a problem that the engineer is a professional engineer and has to wait while work other than welding work is being performed, and the work efficiency is poor. As a method of continuously welding the color pieces 102a and 102b, a method of starting a welding operation after assembling a large number of propulsion pipes into a cylindrical shape is conceivable. A space for stocking the propulsion pipes is required, which is not realistic.

    Further, in the case of the propulsion pipe as described above, since the collar pieces 102a and 102b are welded to the propulsion pipe 100, the concrete of the propulsion pipe and the seal member 104 are altered by the welding heat. There was a fear.

The present invention is excellent in working efficiency, split collar piece can prevent deterioration due to welding heat, propulsion tube, and it is an object to provide a propulsion tube assembly consisting of said split collar piece and said propulsion tube.

なる不等式が成立する、ことを特徴とする。 The invention according to claim 1 is a propulsion pipe (see, for example, reference symbol A _{i in} FIGS. 1 and 3 (c)) and a propulsion tube (see reference symbol A _{i + 1 in} FIGS. 1 and 3 (c)). clearance between the (B) is a, the configured so as to close the part along the circumferential direction interval (reference numeral C ₁ or C ₂ of FIG. 1), the gap portion (B) 1 are divided collar pieces (see reference numeral D ₁ or D _{2 in} FIG. 1) that are arranged in a state of being connected in the circumferential direction so as to close the entire circumference (portions indicated by reference numerals C ₁ and C ₂ in FIG. 1). )
While straddling both outer peripheral surfaces of the two propulsion pipes (A _i , A _{i + 1} ) facing each other with the gap (B) in between, the length along the axial direction of the propulsion pipe and one outer peripheral surface The strip-shaped collar portion (1) disposed in a part of the section (C ₁ or C ₂ ) along the circumferential direction so that the overlap length with the other outer peripheral surface becomes larger than the overlap length of When,
A plate-like flange portion (2) protruding inward from the inner peripheral surface of the collar portion (1) so as to enter the gap portion (B);
It is fixed to the flange portion (2) so as to protrude along the axial direction of the propulsion tube (see reference numeral 4 in FIG. 1) on the side of the propulsion tube having a smaller overlapping length with the collar portion. And a rod-shaped member (see reference numeral 3 in FIG. 2 (c) and FIG. 3) for fixing to the propelling tube (A _{i + 1} ) after being formed ,
In the case where the seal member (7) is disposed on the outer peripheral surface of the propulsion pipe (A _i ) and covered with the collar portion (1),
The projection length from the flange portion of said rod-like member (3) (2) and X _1, the distance until said sealing member (7) from an axial end surface (6) in the propulsion tube and X _2, wherein collar the flange portion (1) the projection length from the (2) in the case of the X _3,

The following inequality holds.

The invention according to claim 2 is directed to a propulsion pipe (see symbol A _{i + 1 in} FIG. 1) in which a plurality of substantially bowl-shaped divided propulsion pipe pieces (G ₁ , G ₂ ) are connected in the circumferential direction and configured in a substantially cylindrical shape. ,
The at least one divided propulsion tube piece (G ₁ , G ₂ ) has a second engagement portion (see reference numeral 6a shown in FIG. 3) to which the rod-like member (3, 13) according to claim 1 is engaged. It is characterized by having.

According to a third aspect of the present invention, in the second aspect of the present invention, the second engaging portion (6a) includes at least one divided propulsion tube piece so that the rod-shaped members (3, 13) are inserted. It is a hole formed in the end surface (6) in the axial direction in (G ₁ , G ₂ ).

The invention according to claim 4, in the invention of claim 2 or 3, wherein the second engaging portion (reference numeral 6a), the divided collar piece _(D 1, _{D 2)} is the divided propulsion tube pieces ( in a state attached to G _{1, G 2),} the divided collar piece _(D 1, _{D 2} circumferential direction of the end surface of) (reference numeral 5 in FIG. 1) is the divided propulsion tube piece _{(G 1, G} 2) It is formed in the positional relationship which shifts | deviates to the circumferential direction with respect to the end surface (refer code | symbol F of FIG. 1) in the circumferential direction.

According to a fifth aspect of the present invention, a plurality of the above-described propulsion pipes and the above-described divided collar pieces (D ₁ , D ₂ ) are connected in the circumferential direction to form an annular shape, and at the end of the propulsion pipe in the axial direction. and fitted into the annular collar (reference D ₀ shown in FIG. 1), it is for the propulsion tube assembly having a.

    Note that the numbers in parentheses are for the sake of convenience indicating the corresponding elements in the drawings, and therefore the present description is not limited to the descriptions on the drawings.

According to the present invention , since the divided collar piece has a rod-like member for fixing to the propelling pipe after being molded, it is not necessary to be attached to the propelling pipe from the beginning when the propulsion pipe is manufactured. It is sufficient if the propulsion pipe is fixed before it is buried. Therefore, the divided collar pieces can be transported from the factory to the site where the propulsion pipe is buried without being fixed to the propulsion pipe. Here, if such transportation is carried out in the state of an annular collar, the transportation becomes difficult, and there may be a situation where the transportation is subject to the regulation of the Road Traffic Law. However, according to the present invention, since a plurality of divided collar pieces are connected in the circumferential direction to form an annular collar, from the factory to the embedding site of the propulsion pipe, it is not in an annular collar state, It can be transported in the state of divided color pieces, and such a problem can be solved. On the other hand, in order to form the annular collar with the divided collar pieces, a welding operation by a welding operator is required. If the welding work must be performed on the split collar piece fixed to the propulsion pipe, the welding pipe is carried into the propulsion pipe embedding site (and is carried into the site). The welding operation must be performed only on the number of propulsion pipes that have been introduced, and the welding operator had to wait while the propulsion pipe was not carried in, resulting in poor work efficiency. However, according to the present invention, since the welding operation can be performed on the divided collar piece that is not fixed to the propulsion pipe, the welding operation is completely independent of whether or not the propulsion pipe has been brought into the field. Only work can be performed, and work efficiency is improved. Further, as described above, since the divided collar pieces can be welded in a state where they are not fixed to the propulsion pipe, the propulsion pipe and the seal member of the propulsion pipe are not damaged by the welding heat.

In addition , the collar portion on one side of the split collar and the seal member on the propelling tube side do not come in contact until the rod-shaped member on the one side of the split collar is engaged with the propelling tube side, so that the frictional force from the seal member is received. The position of the rod-shaped member can be adjusted by moving the divided collar piece freely.

According to the invention of claim 4 , the stress concentration portion is dispersed because the circumferential end face of the divided collar piece is in a positional relationship with respect to the circumferential end face of the divided propulsion tube piece. Can be placed.

The best mode for carrying out the present invention will be described below with reference to FIGS. Here, FIG. 1 is a perspective view showing an example of the usage state of the divided color piece according to the present invention, and FIG. 2A is an exploded perspective view showing an example of the structure of the divided color piece according to the present invention. (B) is a perspective view showing an example of the appearance of the divided color piece according to the present invention, and (c) is an end view showing an example of a cross-sectional shape of the divided color piece according to the present invention. It is. FIG. 3 (a) is an end view showing an example of a state in which the divided collar piece according to the present invention is engaged with the propulsion pipe, and FIG. 3 (b) shows one propulsion pipe _{Ai + 1} and another propulsion. It is an end view which shows an example of a mode that pipe _Ai is connected, and the figure (c) is an end view showing an example of the state where those propulsion pipes _{Ai + 1} and _Ai were connected. Further, FIG. 4 (a) is an end view showing another example of the cross-sectional shape of the divided collar piece according to the present invention, and FIG. 4 (b) is an end view showing an example of the mounted state. FIG. 6C is an end view showing still another example of the cross-sectional shape of the divided collar piece according to the present invention.

The divided collar piece according to the present invention includes a propulsion pipe (see, for example, reference symbol A _{i in} FIGS. 1 and 3 (c)) and a propulsion tube (see reference symbol A _{i + 1 in} FIGS. 1 and 3 (c)). ) Is closed (see reference numeral B in FIGS. 1 and 3C). Split collar piece according to the present invention is a shape shown by reference numeral D ₁ and D ₂ in Figure 1, rather than annular, such as to close the entire circumference of (C 1 _{+ C 2)} of the clearance portion B, the circumferential only shaped to occlude some along the direction section (section shown by reference numeral C _1, or section indicated by reference numeral C _2). That is, the divided collar piece D _1, D ₂ is more connected circumferentially annular collar (hereinafter, "annular collar" and) constitutes a D _0, the total of the clearance B by annular collar D ₀ The circumference will be blocked. In FIG. 1, the two divided color pieces are denoted by different symbols D ₁ and D ₂ , but in this specification, the symbol D is used when it is not necessary to distinguish between the two. In the case where it is necessary to distinguish between the _two , the description will be made using the symbols D ₁ and D ₂ . Also, in the figure, the two sections along the circumferential direction are given different symbols C ₁ and C ₂ respectively. However, in this specification, when there is no need to distinguish between the two, Explanation will be made using C, and when it is necessary to distinguish between the _two , explanation will be made using reference symbols C ₁ and C ₂ . Further, in the figure, the propulsion pipes are given different symbols A _i , A _{i + 1} , and A _{i + 2} , respectively. However, in this specification, the symbols A are used when it is not necessary to distinguish them. In the case where it is necessary to distinguish between them, description will be made using symbols A _i , A _{i + 1} , and A _{i + 2} . In FIG. 1, the two split collar piece D _1, D ₂ by a single annular collar D ₀ is formed by three or more sequential color piece may constitute one annular collar. It is preferable to connect the divided collar pieces D by welding. However, in order to increase the roundness of the annular collar D ₀ , it is preferable to reduce the number of welded portions as much as possible and to suppress deformation caused by welding heat as much as possible. It is better to reduce the number of connections that must be made.

On the other hand, each propulsion pipe A is constituted by a plurality of substantially bowl-shaped divided propulsion pipe pieces (refer to reference numerals G ₁ and G ₂ ) connected in the circumferential direction and configured in a substantially cylindrical shape, as described above. The substantially rod-shaped split propulsion tube pieces G ₁ and G ₂ manufactured in the factory are conveyed in a substantially bowl-like shape to the site where the propulsion tube is embedded (see FIG. 5), and are substantially cylindrical at the site. It is assembled (see FIG. 6). Reference numeral F denotes a coupling surface of the split propulsion tube pieces _G 1, _{G 2.} In FIG. 1, the two divided propulsion tube pieces are given different symbols G ₁ and G _{2. In} this specification, the symbol G is used when it is not necessary to distinguish between the two. In the case where it is necessary to distinguish between the _two , the description will be made using the symbols G ₁ and G ₂ . Further, in FIG. 1, one propulsion pipe is formed by two divided propulsion pipe pieces, but one propulsion pipe may be formed by three or more divided propulsion pipe pieces.

    Hereinafter, a specific structure of the divided color piece D according to the present invention will be described.

The divided collar piece D according to the present invention includes two plate-like members 1 and 2 as shown in FIG. One plate-like member (hereinafter referred to as “collar portion”) 1 has a curved strip shape as shown in FIGS. 2 (a) and 2 (b). As shown in FIG. Are arranged along the outer peripheral surface (a part of the section C along the circumferential direction, not the entire outer peripheral surface). As shown in detail in FIG. 3 (c), the collar portion 1 is disposed so as to straddle both outer peripheral surfaces of the two propulsion pipes A _i and A _{i + 1} facing each other with the gap portion B interposed therebetween. Part B will be closed. When a plurality of collar portions 1 are connected in the circumferential direction, the collar portion 1 has a substantially cylindrical shape that closes the entire circumference of the gap portion B.

Further, the other plate-like member (hereinafter referred to as “flange portion”) 2 is formed in the axial direction (see FIG. 3) from the inner peripheral surface of the collar portion 1 (see reference numeral 1a in FIGS. 3 (a) and 3 (c)). 1 (see reference numeral 4 in FIG. 1). A cross section (HH cross section in FIG. 2 (b)) perpendicular to the circumferential direction formed by the collar portion 1 and the flange portion 2 is substantially T-shaped as shown in FIG. 2 (c). . As shown in detail in FIG. 3 (c), the flange portion 2 is arranged so as to enter the gap portion B when set in the propulsion pipes A _i and A _{i + 1} . Further, when a plurality of the flange portions 2 are arranged in the circumferential direction, the flange portion 2 has a substantially donut plate shape.

    On the other hand, the divided collar piece D according to the present invention has a fixing member (see reference numeral 3 in FIG. 2 (c) and reference numeral 13 in FIG. 4 (a)) for fixing to the propelling pipe A after being molded. is doing. The anchor bar 103 shown in FIG. 8 also corresponds to a fixing member for fixing the divided collar piece. However, the anchor bar 103 is embedded in the propelling pipe at the stage of molding, Not fixed to the propulsion pipe after That is, in this specification, the “fixing member for fixing to the formed propelling pipe” means a member for fixing to the propelling pipe in a state where some engagement portion is formed. (Details will be described later).

Since the divided collar piece D according to the present invention has the fixing members 3 and 13 for fixing to the propulsion pipe A, it is not necessary to be attached to the propulsion pipe A from the beginning when the propulsion pipe is manufactured. It is sufficient that the pipe A is fixed before it is buried. Therefore, the division | segmentation collar piece D can also be conveyed from a factory to the embedding site of a propulsion pipe in the state which is not being fixed to the propulsion pipe. Here, if such transportation is carried out in the state of an annular collar, the transportation becomes difficult, and there may be a situation where the transportation is subject to the regulation of the Road Traffic Law. However, according to the present invention, since the split collar piece D has become a plurality of connected circumferentially to constitute a color D ₀ of the ring, until buried site propulsion tube from the factory, annular collar D ₀ It can be transported in the state of the divided color piece D instead of the state of the above, and such a problem can be solved. On the other hand, in order to form the annular collar D ₀ at split collar piece D is needed welding by the welding operator. If the welding operation must be performed on the divided collar piece D fixed to the propulsion pipe, the welding pipe is carried into the propulsion pipe embedding site (and is carried into the site). The welding operation must be performed only on the number of propulsion pipes that have been provided, and the welding operator had to wait while the propulsion pipe was not carried in, resulting in poor work efficiency. However, according to the present invention, since the welding operation can be performed on the divided collar piece D that is not fixed to the propulsion pipe, it is completely irrelevant whether the propulsion pipe has been brought into the field. Only welding work can be performed, and work efficiency is improved. Space stocking the annular collar D _0, so requires narrower than the space stocking the propulsion tube, it can also be stocked numerous annular collar D ₀ performing welding continuously and Become. Further, as described above, since the division collar piece D can be welded without being fixed to the propulsion pipe, the propulsion pipe and the seal member of the propulsion pipe are not damaged by the welding heat.

As a fixing member as described above,
A rod-like member fixed to the flange portion 2 so as to protrude along the axial direction 4 of the propulsion pipe (see reference numeral 3 in FIG. 2 (c)),
A rod-like member (see reference numeral 13 in the figure) that is detachably supported by a first engaging part (see reference numeral 2a in FIG. 4 (a)) formed in the flange part 2; In the state attached to 2, the member arrange | positioned so that it may protrude along the axial direction 4 of the said propulsion pipe can be mentioned. As the first engaging portion 2a, a hole for inserting the rod-shaped member 13 may be formed, and a bolt may be used for the rod-shaped member 13. The above-mentioned fixing members are all rod-shaped members and are members arranged so as to protrude along the axial direction 4 of the propulsion pipe. 4 may be a rod-shaped member arranged so as to protrude in a direction other than the direction along 4, or may be a member having a shape other than the rod shape.

Split collar piece D described above, a plurality of connected circumferentially to constitute an annular collar D _0, the fixing member (e.g., reference numeral 3 and 13 to that shown) and thus attached to the propulsion tube A by utilizing However, in order to do so, it is necessary to form a second engaging portion for engaging the fixing member in at least one divided propulsion tube piece G. For example, when the fixing member is a rod-shaped member as indicated by reference numerals 3 and 13, the second engaging portion is arranged in the axial direction 4 of at least one divided propulsion tube piece as shown in FIG. It is preferable that the rod-shaped fixing member 3 or 13 is inserted as the hole portion 6a formed in the end face 6 of this. The split propulsion tube piece G has an end face 6 in the axial direction 4 and an end face in the circumferential direction (see reference numeral F in FIG. 1). For convenience of explanation, the former is referred to as an “axial end face”, and the latter is referred to as the latter. It will be referred to as a “circumferential end face”. Further, an end face in the circumferential direction of the divided collar piece D (see reference numeral 5 in FIG. 1) is also referred to as a “circumferential end face”.

By the way, although the said division | segmentation collar piece D and the said division | segmentation propulsion pipe piece G are all connected and used in the circumferential direction, those connection parts (namely, circumferential direction end surface) correspond, without shifting | deviating in the circumferential direction. And stress concentration part is made. As a method for dispersing such stress concentration parts,
A method of making the circumferential lengths of the divided collar pieces D and the divided propelling tube pieces G different. When the circumferential lengths of the divided collar pieces D and the divided propelling tube pieces G are equal, Position in which the circumferential end face 5 of the divided collar piece D is shifted in the circumferential direction with respect to the circumferential end face F of the divided pushing pipe piece G in a state where the divided collar piece D is attached to the divided pushing pipe piece G. The method of forming the second engagement portion in the relationship can be raised.

On the other hand, the propulsion tube assembly according to the present invention includes the above-described propulsion tube A and an annular collar (that is, the above-described divided collar pieces D are connected in the circumferential direction) fitted into the axial end of the propulsion tube A. It is provided with a by color) D ₀ configuration cyclic,.

なる不等式が成立する、ようにしておくと良い。そのようにした場合には、分割カラー片側のカラー部１と推進管側のシール部材７とは、分割カラー片側の固定部材３が推進管側に係合されるまでは接触しないので、該シール部材７からの摩擦力を受けることなく、分割カラー片Ｄを自由に移動させて固定部材３の位置調整を行うことができる。 Incidentally, as shown by reference numeral 3 in FIGS. 2 (c) and 3 (a), the fixing member is a rod-like member fixed to the flange portion 2 so as to protrude along the axial direction 4 of the propulsion pipe. In Case of,
- split collar piece D and more linked to produce a cyclic collar D _0,
Adjust the position so that the fixing member 3 is aligned with the hole 6a (see FIG. 3 (a)),
- the annular collar D ₀ moves in the axial direction 4, fitted on the outer circumferential surface of the propulsion tube A color portion 1 of the annular collar D ₀ with fitting the fixing member 3 into the hole 6a (Fig. (B) reference),
It is necessary to do the work. Although the above-described position adjustment can be performed with higher accuracy when the fixing member 3 is close to the hole 6a, the outer peripheral surface of the propelling tube A into which the collar portion 1 is fitted (that is, the portion covered by the collar portion 1). ) Is provided with a seal member (see reference numeral 7 in FIG. 3A), the collar 1 is caused by friction with the seal member 7 when the collar portion 1 is in contact with the seal member 7. The rotation in the circumferential direction of ₀ is prohibited, and the position adjustment cannot be performed. To prevent such a situation, as shown in FIG. 3 (a), the protruding length from the flange portion 2 of the stationary member 3 and X _1, wherein the sealing member from an axial end surface 6 of the propulsion tube the distance to 7 when the X _2, a protruding length from the flange portion 2 of the collar 1 and X _3,

It is recommended that the inequality is satisfied. In such a case, the collar portion 1 on one side of the split collar and the seal member 7 on the propelling tube side do not contact until the fixing member 3 on the split collar one side is engaged with the propelling tube side. Without receiving the frictional force from the member 7, the position of the fixing member 3 can be adjusted by moving the divided collar piece D freely.

なる不等式が成立する、ようにしておくと良い。 On the other hand, as shown in FIGS. 4A and 4B, when the fixing member 13 is detachably supported by the flange portion 2, the position adjustment as described above is performed on the first engaging portion 2a. Even in a state where the fixing member 13 is mounted, it may be performed in a state where a rod-shaped member only for position adjustment (hereinafter referred to as “position adjusting member”) is mounted instead of the fixing member. In that case, when the protruding length of the fixing member 13 and the position adjusting member from the flange portion 2 is X ₁ ′,

It is recommended that the inequality is satisfied.

Incidentally, FIG. 3 (a) (b) ( c) and the flange portion 2 shown in FIG. 4 (a) (b), the protruding length from the collar portion inner circumferential surface 1a (reference numeral Y ₁ in FIG. 3 (a)) Although but is set to be substantially equal to the axial end surface thickness of 6 propulsion tube (reference numeral Y ₂ in the figure), as the flange portion 12 shown in FIG. 4 (c), the protruding length of the shaft You may set so that it may become shorter than the thickness of the direction end surface 6. FIG. In the former case, the cushion material 8 may be disposed on both the front and back surfaces of the flange portion 2. In the latter case, the axial end face 6 of the propulsion pipe is partially recessed, and the flange section 12 and the axial end face 6 of the propulsion pipe are flat with no step when the flange section 12 is mounted. It is preferable that the cushion material 8 is disposed on the plane.

The method of manufacturing the propulsion pipe assembly according to the present invention includes:
A step of preparing a cyclic color D ₀ · a split collar piece D mentioned above in the circumferential direction a plurality linked,
A step of producing the propelling pipe A by connecting a plurality of substantially bowl-shaped divided propelling pipe pieces G in the circumferential direction;
- a step of fitting the annular collar D ₀ to the end portion in the axial direction of the propulsion tube A,
It has.

FIG. 1 is a perspective view showing an example of a usage state of a divided color piece according to the present invention. FIG. 2 (a) is an exploded perspective view showing an example of the structure of the divided color piece according to the present invention, and FIG. 2 (b) is a perspective view showing an example of the appearance of the divided color piece according to the present invention. FIG. 5C is an end view showing an example of a cross-sectional shape of the divided collar piece according to the present invention. FIG. 3 (a) is an end view showing an example of a state where the divided collar piece according to the present invention is engaged with the propulsion pipe, and FIG. 3 (b) shows one propulsion pipe A _{i + 1} and another propulsion pipe A. _It is an end view which shows an example of a mode that _i is connected, The figure (c) is an end view which shows an example of the state which connected those propulsion pipes _{Ai + 1} and _Ai . FIG. 4 (a) is an end view showing another example of the cross-sectional shape of the divided collar piece according to the present invention, and FIG. 4 (b) is an end view showing an example of the state of the mounted state. FIG. (C) is an end view showing still another example of the cross-sectional shape of the divided collar piece according to the present invention. FIG. 5 is a schematic diagram illustrating an example of a state in which the propelling pipe is transported in a half state. FIG. 6 is a schematic diagram illustrating an example of a state where a cylindrical propelling tube is assembled on site. FIG. 7 is a perspective view showing the appearance of the assembled cylindrical propelling tube. FIG. 8 is a schematic diagram showing a fixed state of a conventional color piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Color | collar part 2 Flange part 2a 1st engaging part 3 Fixing member 4 The axial direction of a propulsion pipe 6a 2nd engaging part (hole part)
7 Seal member 13 Fixing member A, A _i , A _{i + 1} , A _{i + 2} Propulsion pipe B Clearance part C, C ₁ , C ₂ Partial section along circumferential direction D, D ₁ , D ₂ divided collar piece D ₀ ring Color G, G ₁ , G ₂ split propulsion tube pieces

Claims (5)

A gap between the propulsion pipes arranged in series and the propulsion pipe is configured to close a part of the section along the circumferential direction, and so as to close the entire circumference of the gap. In the divided color piece that is arranged in a state where a plurality are connected in the circumferential direction,
While straddling both outer peripheral surfaces of the two propulsion pipes facing each other with the gap portion interposed therebetween, the length is along the axial direction of the propulsion pipe, and the other outer peripheral surface is longer than the overlapping length with one outer peripheral surface. A belt-like collar portion arranged in a part of the section along the circumferential direction, so that the overlapping length of
A plate-like flange portion protruding inward from the inner peripheral surface of the collar portion so as to enter the gap portion;
It is fixed to the flange portion so as to protrude along the axial direction of the propulsion tube on the side of the propulsion tube having a smaller overlap length with the collar portion, and to the propulsion tube after being molded A rod-shaped member for fixing;
Equipped with a,
In the case where a seal member is arranged on the outer peripheral surface of the propulsion pipe and covered with the collar portion,
The projection length from the flange portion of the rod-shaped member and X _1, the distance from the end face in the axial direction in the propulsion tube to said sealing member and X _2, the protruding length from the flange portion of the collar portion X If _{the 3} and was,

The inequality
Divided color piece characterized by that . In the propulsion pipe constructed in a substantially cylindrical shape by connecting a plurality of substantially bowl-shaped divided propulsion pipe pieces in the circumferential direction,
At least one divided propulsion tube piece has a second engagement portion with which the rod-shaped member according to claim 1 is engaged.
A propulsion tube characterized by that. The second engagement portion is a hole formed in an end surface in the axial direction of at least one divided propulsion tube piece so that the rod-shaped member is inserted.
The propulsion pipe according to claim 2 , wherein The second engagement portion is a state in which the divided collar piece according to claim 1 is attached to the divided propulsion tube piece, and a circumferential end surface of the divided collar piece is a circumferential end surface of the divided propulsion tube piece. Formed in a positional relationship that deviates in the circumferential direction,
The propulsion pipe according to claim 2 or 3 , wherein A propelling pipe according to any one of claims 2 to 4 ,
A plurality of divided collar pieces according to claim 1 are connected in the circumferential direction to form an annular shape, and an annular collar fitted into the axial end portion of the propulsion tube;
A propulsion tube assembly.

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