JP2009250407A - Connection structure of flange pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a flange pipe which can be easily attached and detached, and does not leak water. <P>SOLUTION: The connection structure of the flange pipe has tapered surfaces 1Ad, 1Bd at abutment direction rear ends of flanges 1Ab, 1Bb of the flange pipes 1A, 1B. Reverse tapered surfaces abutting on the tapered surfaces 1Ad, 1Bd in a gripping state are formed in a groove of a gripping part. A ring shape packing material is inserted between end surfaces of the flanges 1Ab, 1Bb. When both the flanges 1Ab, 1Bb are surrounded, gripped and pressed from an outer circumference side by a pair of the gripping parts in a state that the flanges 1Ab, 1Bb are abutted thereon, the flanges 1Ab, 1Bb are guided by the reverse tapered surface of the groove, respectively, and axial centers LA, LB of the flange pipes 1A, 1B are aligned and abutment side end surfaces of the flange pipes 1A, 1B are press-bonded to each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flange pipe joining structure in which two flange pipes are joined by a joining member.

  2. Description of the Related Art Conventionally, a flange pipe joining structure in which two flange pipes are joined by a joining member is known (see Patent Document 1).

  In recent years, polyethylene resin pipes are widely used for pipes such as water pipes.

  When joining such a resin pipe at the piping site, it is carried out by so-called butt welding, in which the joining side ends of the two resin pipes are melted by an electric heater and then welded by pressure welding, or Generally, this is performed by using an electric fusion joint provided with an electric heater inside.

  However, these joining methods are not only time-consuming, but in the case of temporary piping used at construction sites, for example, it is necessary to remove and collect the piping after a certain period of use. Since the resin tube connected during the recovery is cut, not only does the recovery take time and cost, but the electric fusion joints cannot be reused and must be discarded, resulting in wasted resources. There was a problem that.

In order to solve such a problem, as shown in FIG. 9, a ring-shaped rubber packing P is attached to the outer peripheral portion of the flange portions 11a and 11a with the two flange tubes 11 and 11 being attached to each other. Patent Document 1 discloses a joint structure of a flange pipe in which the rubber packing P and the flange portions 11a and 11a are sandwiched and joined from the outer peripheral side by a split member 12 that has a ring shape when closed.
Japanese Patent Laid-Open No. 2004-1000077

  However, in the joining structure according to Patent Document 1, when long pipes or the like are joined to the non-joining side ends of the flange pipes 11 and 11, the joining side of the flange pipes 11 and 11 is caused by the weight of these long pipes. There is a problem that it is difficult to align the ends, and it is difficult to mount the rubber packing P and the joining member 12.

  Specifically, as shown in FIG. 10A, when the joining member 12 is attached, if the distance between the joining side end portions of the flange pipes 11 and 11 is larger than a predetermined distance during joining, the joining member 12 is When the joining member 12 cannot be mounted due to interference with the flange portions 11a and 11a, and the distance between the joining side end portions of the flange pipes 11 and 11 is closer than a predetermined distance as shown in FIG. The joining member 12 can be attached even when the shaft axes of the two flange pipes 11 and 11 are slightly deviated from each other. If the joining member 12 is attached in this state, there is a risk of causing water leakage.

  Therefore, an object of the present invention is to provide a flange pipe joining structure that can be easily attached and detached and that does not leak water.

  In order to achieve the above object, the invention according to claim 1 is characterized in that both flange portions are surrounded and sandwiched from the outer peripheral side in a state where the respective flange portions of two resin pipes having flange portions at one end face each other. A flange pipe joining structure in which two resin pipes are joined by a joining member made up of a pair of split members, wherein the joining member is openably and closably connected by a hinge portion, and surrounds both flange portions from the outer peripheral side. And a clamping part having a groove part to be clamped, and a pressure-contact fixing part that makes it possible to fix the other split end part in a closed state and to make the pair of clamping parts pressure-contactable in the diameter-reducing direction, A taper surface is provided at the rear end portion in the abutting direction of each flange portion of the two resin pipes, and a reverse taper surface that is in contact with each taper surface in a nipped state is provided in each groove portion of the nipping portion, The franc When a ring-shaped packing material is interposed between the end faces of each part, and the flange parts are roughly butted together, and both flange parts are surrounded by the pair of holding parts from the outer peripheral side and are sandwiched and pressed. The flange portions are respectively guided by the reverse tapered surfaces of the groove portions, the axial centers of the resin tubes substantially coincide with each other, and the abutting side end surfaces of the resin tubes in which the packing material is interposed are mutually connected. It features a welded structure of flanged pipes that are pressure-welded.

  In the invention according to claim 2, the inclination angle of the taper surface of each flange portion with respect to the pipe direction of each resin pipe, and the inclination of the reverse taper surface of each groove portion with respect to the pipe direction of each resin pipe The flange pipe joint structure according to claim 1, wherein the corners are set equal to each other.

  The invention according to claim 3 is characterized in that the flange pipe joining structure according to claim 1 or claim 2 wherein the front end surface of the resin pipe in the abutting direction is a flat surface.

  Furthermore, the invention according to claim 4 is provided with positioning means for positioning the packing material at an appropriate position between the front end surfaces of the two resin pipes in the butting direction. It features a tube joint structure.

  The invention according to claim 5 is characterized in that the resin pipe is a straight pipe, a bend pipe, or a T-shaped pipe, and the flange pipe joint structure according to any one of claims 1 to 4. .

  In the flange pipe joint structure according to claim 1, a ring-shaped packing material is interposed between the end faces of the flange portion, and the two flange portions are joined by a pair of sandwiching portions in a state where the flange portions are roughly abutted. When encircling from the outer periphery side and sandwiching and pressing, each flange part is guided to the groove part, the axial center of each resin pipe is almost coincident, and the end faces on the butt side of the resin pipe interposing the packing material are Since they are pressed against each other, water leakage between these end faces can be reliably prevented.

  In the flange pipe joint structure according to claim 2, since the inclination angle of the taper surface of the flange portion of each resin pipe and the inclination angle of the reverse taper surface of each groove portion with respect to the pipe line direction are equal, When the resin pipes are joined, the respective flange portions are smoothly guided to both groove portions, and in the joined state, the tapered surface and the reverse tapered surface are in close contact with each other, so that the two resin tubes are firmly joined.

  Further, in the joined state, the two taper pipes are not displaced after joining because the reverse tapered surfaces of the pair of grooves are in contact with the tapered surfaces of the pair of flange portions from the outer peripheral side. Water leakage between the end faces can be reliably prevented.

  Further, in the flange pipe joint structure according to claim 3, since at least one of the two end faces in the abutting direction of the two resin pipes is a flat surface, each pipe axis position of the two resin pipes is positioned. It is possible to prevent the packing material from sliding smoothly on the flat surface when being put together, and being attached in a state where the packing material is deviated from the normal position.

  Further, even if the packing material and the abutting side end surface of the resin tube interfere with each other, the packing material is not damaged.

  In the flange pipe joining structure according to claim 4, since the positioning means for positioning the packing material at an appropriate position is provided, the packing material can be easily positioned at the appropriate position, and the waterproofing effect of the packing material can be obtained. It can be fully demonstrated.

  Furthermore, in the flange pipe joint structure according to claim 5, since the resin pipe is a straight pipe, a bend pipe or a T-shaped pipe, the degree of freedom in piping design is great.

  Hereinafter, embodiments according to the present invention will be described based on examples.

<Constitution>
<Configuration of flange pipe>
In FIG. 1, reference numerals 1 </ b> A and 1 </ b> B denote polyethylene resin flange tubes each having a flange formed at one end.

  The flange pipes 1A and 1B respectively have pipe main body parts 1Aa and 1Ba, and flange parts 1Ab and 1Bb bulged and formed at one end of the pipe main body parts 1Aa and 1Ba in the outer peripheral direction.

  The butted side end surfaces 1Ac and 1Bc of the two flange tubes 1A and 1B are flat surfaces perpendicular to the axial direction of the tube main body portions 1Aa and 1Ba, respectively.

  Further, tapered surfaces 1Ad and 1Bd are provided at the rear end portions in the abutting direction of the flange portions 1Ab and 1Bb, respectively.

  In the present embodiment, an angle θ formed by the tapered surfaces 1Ad, 1Bd and the outer peripheral surfaces of the pipe main body portions 1Aa, 1Ba is set to θ = 120 °.

  In the flange tube 1A according to the present embodiment, a ring-shaped packing groove 1Ae is formed on the abutting side end face 1Ac side of the flange 1Ab, and a ring-shaped packing material P1 is attached to the groove 1Ae. .

  The packing material P1 is positioned at an appropriate position between the butted end surfaces 1Ac and 1Bc of the two flange pipes 1A and 1B by the groove 1Ae.

  In addition, although illustration is omitted, grooves may be formed on the end surfaces of both flange portions so as to be in a position shifted in the radial direction when the flange portions are combined, and packing materials may be interposed respectively.

<Composition of joining member>
In FIG. 2, the code | symbol 2 has shown the substantially ring-shaped joining member which concerns on a present Example.

  The joining member 2 is composed of two divided members 2U and 2L.

  The joining member 2 includes a pair of substantially semicircular arc-shaped holding portions 2Ua and 2La provided on each of the pair of split members 2U and 2L, and a hinge portion at one split end of the pair of split members 2U and 2L. H and a pressure contact fixing portion C are provided at the other split end of the pair of split members 2U and 2L.

  The sandwiching portions 2Ua and 2La surround and sandwich both flange portions 1Ab and 1Bb of the two flange tubes 1A and 1B that are abutted in the joined state of the flange tubes 1A and 1B. .

  The hinge portion H connects the pair of divided members 2U and 2L so as to be openable and closable, and the pressure contact fixing portion C can fix the pair of divided members 2U and 2L in a closed state, and a pair of holding portions 2Ua, 2La can be pressed in the reduced diameter direction.

  As shown in FIG. 3, a bearing portion HU is provided at one end of the holding portion 2Ua, and a pair of bearing portions HL and HL is provided at one end of the holding portion 2La. .

  The bearing portion HU is provided with a shaft hole HUa, and the pair of bearing portions HL and HL are provided with shaft holes HLa and HLa, respectively.

  As shown in FIG. 2, the bearing portion HU is inserted between the pair of bearing portions HL, HL, and the rotation shaft S is passed through the shaft holes HLa, HUa, HLa in a state where the shaft holes HLa, HUa, HLa are communicated. The hinge portion H is configured by preventing the both ends of the ring from being removed by the retaining rings R and R.

  Further, as shown in FIG. 3, a plate-like coupling portion CU extending outward in the radial direction is provided at the other end portion of the holding portion 2Ua, and the other end portion of the holding portion 2La is provided at the other end portion. A pair of plate-like coupling portions CL, CL extending outward in the radial direction is provided.

  The coupling part CU and the coupling parts CL, CL are arranged to face each other in the closed state of the divided members 2U, 2L.

  Further, the coupling portions CL and CL are formed at positions where the shaft holes CLa and CLa communicate with each other, and the ring portion Ia of the eyebolt I shown in FIG. 2 is inserted between the pair of coupling portions CL and CL. A space S is formed.

  As shown in FIG. 2, with the ring portion Ia of the eyebolt I inserted into the space S and the shaft holes CLa and CLa communicating with the holes of the ring portion Ia, the bolt B is passed through these holes. The nut N is fixed.

  Since the inner diameter of the hole of the ring portion Ia is slightly larger than the diameter of the bolt B, the eyebolt I is rotatable about the bolt B.

  As shown in FIG. 3, the coupling portion CU is provided with a cut portion CUa for inserting the bolt portion Ib of the eyebolt I. As shown in FIG. 2, the bolt portion Ib is inserted into the cut portion CUa. In this state, by tightening the nut N through the washer W to the bolt part Ib, the coupling part CU and the coupling parts CL, CL are coupled.

  Further, by further tightening the nut N, the pair of holding portions 2Ua and 2La can be pressed in the diameter reducing direction.

  As shown in FIG. 4 (a), groove portions 2Ub and 2Lb having an isosceles trapezoidal cross section in the circumferential direction are formed on the inner peripheral surface side of the pair of holding portions 2Ua and 2La, respectively. The groove widths of the groove portions 2Ub and 2Lb become narrower toward the outer side in the radial direction.

  As shown in FIG. 4 (c), these groove portions 2Ub and 2Lb are both flange portions in a state in which the respective tube axes of the flange tubes 1A and 1B are abutted and abutted and the abutting side end surfaces 1Ac and 1Bc are brought into contact with each other. 1Ab and 1Bb are substantially conforming to the outer shape, and in a joined state, both flange portions 1Ab and 1Bb of the two flange pipes 1A and 1B are fitted from the outer peripheral side.

  As shown in FIG. 4A, the groove portions 2Ub and 2Lb are provided with reverse tapered surfaces 2Ud and 2Ld inclined toward the center in the radial direction of the joining member 2, respectively. 2Ld comes into contact with the tapered surfaces 1Ad and 1Bd of both flange portions 1Ab and 1Bb of the two flange pipes 1A and 1B in a butted state in a fitted state.

  In the present embodiment, the inclination angle θ of the tapered surfaces 1Ad and 1Bd of the flange portions 1Ab and 1Bb with respect to the pipe direction of the flange pipes 1A and 1B, and the groove portions 2Ub and 2Lb with respect to the pipe direction of the flange pipes 1A and 1B. The reverse taper surfaces 2Ud and 2Ld are equal in inclination angle θ and set to 120 °.

  In the flange pipe joint structure of this embodiment, both the flange portions 1Ab and 1Bb of the two flange pipes 1A and 1B are brought into contact with each other by the joint member 2 including the pair of split members 2U and 2L. The two flange pipes 1A and 1B are joined by surrounding and sandwiching the flange portions 1Ab and 1Bb from the outer peripheral side.

<Join method>
First, the dividing member 2L is placed on the ground or the like in a state where the joining member 2 is expanded around the hinge portion H.

  Next, as shown in FIG. 5A, in a state where the flange portions 1Ab and 1Bb of the two flange tubes 1A and 1B are roughly abutted, the lower ends of the flange portions 1Aa and 1Ba of the flange tubes 1A and 1B are It mounts in the groove part 2Lb of the division member 2L.

  And as shown in FIG.5 (b), the division member 2U is rotated centering on the hinge part H, and it covers from the top, and a pair of flange parts 1Ab and 1Bb are carried out from the outer peripheral side by a pair of clamping parts 2Ua and 2La. Enclose and hold.

  At this time, the pair of flange portions 1Ab and 1Bb are arranged so that the respective axial positions of the two flange pipes 1A and 1B substantially coincide with each other while the butted side end surfaces 1Ac and 1Bc of the pair of flange portions 1Ab and 1Bb approach each other. It is guided to both groove portions 2Ub and 2Lb.

  Further, the distal end portion of the eyebolt I rotatably provided at the coupling portion CL of the dividing member 2L is inserted into the cut portion CUa of the coupling portion CU of the dividing member 2U, and a nut is manually inserted into the distal end portion of the eyebolt I. N is screwed and temporarily fixed, and the nut N is finally tightened with a tool such as a ratchet or a nut driver.

  At this time, the pair of sandwiching portions 2Ua and 2La are pressed in the diameter-reducing direction, and the reverse tapered surfaces 2Ud and 2Ld of the pair of sandwiching portions 2Ua and 2La are in contact with each other as shown in FIG. Since the two flange portions 1Ab and 1Bb of the two flange pipes 1A and 1B are in contact with the tapered surfaces 1Ad and 1Bd, the butted side end surfaces 1Ac and 1Bc of the pair of flange portions 1Ab and 1Bb are pressed against each other.

<Function and effect>
As shown in FIG. 6, since the pair of reverse tapered surfaces 2Ud and 2Ld constituting the groove portions 2Ub and 2Lb are inclined surfaces inclined toward the radial center of the joining member 2, the split members 2U and 2L The pressing force F in the center axis direction when nipping acts on the flange portions 1Ab and 1Bb of the flange pipes 1A and 1B as a pressing force F1 pressing in the center axis direction and a pressing force F2 moving in the butting direction.

  Of these pressing forces F1 and F2, the pressing force F1 pressed in the direction of the central axis acts to adjust the axis of the flange pipes 1A and 1B.

  Further, since the pressing force F2 gives a compressive force between the abutting side end faces 1Ac and 1Bc, even if the axial centers of the flange pipes 1A and 1B are slightly misaligned, the axial centers LA and LB of the flange pipes 1A and 1B Bending and deviation are corrected (see FIG. 5C).

  In addition, the water tightness is enhanced by the compressive force F1, and the compressive force F1 is a resistance against the tensile force acting on the flange pipes 1A and 1B, so that the bonding strength against the tensile force can be increased.

  As described above, in the joined state of the two flange pipes 1A and 1B, the end faces on the abutting side of the flange pipes 1A and 1B in which the packing material P1 is interposed in a state where the axes of the two flange pipes 1A and 1B coincide with each other. Since 1Ac and 1Bc are pressed against each other, it is possible to reliably prevent water leakage between the abutting side end faces 1Ac and 1B.

  Since the inclination angles of the tapered surfaces 1Ad, 1Bd of the flange portions 1Ab, 1Bb of the flange pipes 1A, 1B and the inclination angles of the reverse tapered surfaces 2Ud, 2Ld of the groove portions 2Ub, 2Lb with respect to the pipe direction are equal, When the two flange pipes 1A and 1B are joined, the flange portions 1Ab and 1Bb are smoothly guided to both the groove portions 2Ub and 2Lb. In the joined state, the tapered surfaces 1Ad and 1Bd and the reverse tapered surfaces 2Ud and 2Ld are in close contact with each other. The tubes 1A and 1B are firmly joined.

  Further, in the joined state, the pair of groove portions 2Ub, 2Lb of the pair of flange portions 1Ab, 1Bb are fitted with the reverse tapered surfaces 2Ud, 2Ld in contact with each other from the outer peripheral side. The two flange pipes 1A and 1B are not displaced, and water leakage between the abutting side end faces 1Ac and 1B can be reliably prevented.

  Further, since the butted side end surfaces 1Bc of the two flange pipes 1B are flat surfaces, the packing material P1 smooths the butted side end face 1Bc when the pipe shaft positions of the two flange pipes 1A and 1B are aligned. It is possible to prevent the packing material P1 from being mounted in a state shifted from the normal position.

  Further, even if the packing material P1 interferes with the abutting side end faces 1Ac, 1Bc of the flange pipes 1A, 1B, the packing material P1 is not damaged.

  And since the positioning means which positions the packing material P1 in an appropriate position is provided, the packing material P1 can be easily positioned in an appropriate position, and the water stop effect of the packing material P1 can fully be exhibited.

  Furthermore, since the flange pipes 1A and 1B are straight pipes, bend pipes, or T-shaped pipes, the degree of freedom in piping design is great.

  Moreover, since the two flange pipes 1A and 1B can be joined simply by mounting the joining member 2 to the pair of flange portions 1Ab and 1Bb, the workability during piping is good, and the joining member 2 is paired with the pair of flange portions 1Ab and 1Bb. Since the joining of the two flange pipes 1A and 1B can be released simply by removing them from the pipe, the workability at the time of pipe collection is also good.

  In addition, since the dry connection does not use heat fusion or adhesive, the recovered piping and the joining member 2 can be reused as they are, and there is no waste when used for temporary piping.

  Since the packing material P1 is interposed between the butted side end surfaces 1Ac and 1Bc of the pair of flange portions 1Ab and 1Bb, the thickness of the packing material P1 can be minimized and the packing material P1 is applied to the packing material P1. Cost can be reduced.

  Furthermore, by suppressing the thickness of the packing material P1 to a minimum, the reaction force of the packing material P1 can be suppressed, and the packing material P1 is placed between the butted end surfaces 1Ac, 1Bc of the pair of flange pipes 1A, 1B. Since the reaction force due to the packing material P1 is applied to the flange pipe in the direction of the pipe line, it is not necessary to increase the wall thickness of the tube as a countermeasure against the reaction force of the packing material P1.

In addition, since gaps are provided between the bottom surface of the groove and the outer peripheral surface of the flange portion, and between the inner peripheral surfaces of both sides of the holding portion and the outer peripheral surface of the flange tube, Since these parts do not come into contact with each other, the pressing force is not dispersed in these parts, the stress can be applied to the flange part efficiently, and the surface contact makes it possible to increase the joint strength without stress concentration. be able to.

<Constitution>
The flange pipe joint structure of the second embodiment will be described with a focus on the parts different from the first embodiment, and the description of the common parts will be omitted. In the drawings, the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 7, the ring-shaped packing material P2 according to the second embodiment has a ring-shaped base portion P2a whose outer diameter is substantially the same as the outer diameter of the flange portion, and a concentric shape on the inner diameter side of the base portion P2a. It has a pair of ring-shaped rib portions P2b and P2c that bulge adjacently.

<Join method>
In the flange pipe joining structure of the second embodiment, two flange pipes 1B and 1B are joined.

  First, the dividing member 2L is placed on the ground or the like in a state where the joining member 2 is expanded around the hinge portion H.

  Next, as shown in FIG. 8A, in a state where the flange portions 1Bb and 1Bb of the two flange tubes 1B and 1B are roughly abutted, the lower ends of the flange portions 1Ba and 1Ba of the flange tubes 1B and 1B are It mounts in the groove part 2Lb of the division member 2L.

  And the packing material P2 of a present Example is interposed in the clearance gap between each flange part 1Bb and 1Bb.

  At this time, the outer peripheral edge of the base portion P2a comes into contact with the groove portion 2Lb of the dividing member 2L, and the packing material P2 is placed at an appropriate position between the butted end surfaces 1Bc and 1Bc of the two flange pipes 1B and 1B by the base portion P2a. Positioned.

  And as shown in FIG.8 (b), the division member 2U is rotated centering on the hinge part H, and it covers from the top, and a pair of flange parts 1Bb and 1Bb are carried out from the outer peripheral side by a pair of clamping parts 2Ua and 2La. Enclose and hold.

  At this time, the pair of flange portions 1Bb, 1Bb are arranged so that the respective axial positions of the two flange tubes 1B, 1B substantially coincide with each other while the butted end surfaces 1Bc, 1Bc of the pair of flange portions 1Bb, 1Bb approach each other. It is guided to both groove portions 2Ub and 2Lb.

  Further, the distal end portion of the eyebolt I rotatably provided at the coupling portion CL of the dividing member 2L is inserted into the cut portion CUa of the coupling portion CU of the dividing member 2U, and a nut is manually inserted into the distal end portion of the eyebolt I. N is screwed and temporarily fixed, and the nut N is finally tightened with a tool such as a ratchet or a nut driver.

  At this time, the pair of sandwiching portions 2Ua and 2La are pressed in the diameter-reducing direction, and the reverse tapered surfaces 2Ud and 2Ld of the pair of sandwiching portions 2Ua and 2La are in contact with each other as shown in FIG. Since the two flange portions 1Bb and 1Bb of the two flange pipes 1B and 1B are in contact with the tapered surfaces 1Bd and 1Bd, the butted side end surfaces 1Bc and 1Bc of the pair of flange portions 1Bb and 1Bb are brought into pressure contact with each other.

<Function and effect>
The description is omitted because it is the same as that of the first embodiment.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.

  In addition, although pipe | tube main-body part 1Aa, 1Ba of a present Example is a straight pipe | tube, a bend pipe | tube or a T-shaped pipe | tube may be sufficient.

It is a 3rd page figure of the flange pipe concerning Example 1, Drawing (a) is a figure showing a flange pipe provided with packing, and Drawing (b) is a figure showing a flange pipe without packing. It is a 5th page figure of the joined member concerning the present invention. It is the 4th view of one division member concerning the present invention, and the 4th view of the other division member. 2A is a cross-sectional view of the BB cross section of FIG. 2, and FIGS. 2B and 2C are views showing a flange pipe and a joining member according to the present invention, and each flange portion of two flange pipes. It is a figure of the state which joined two flange pipes by the joining member in the state which faced. Moreover, FIG. (C) is sectional drawing of CC cross section of FIG. (B). It is a figure which shows the joining method which concerns on Example 1, The figure (a) mounted the lower end part of the flange part of a flange pipe in the groove part of a division member in the state which faced each flange part of two flange pipes roughly. The figure which shows a state, The figure (b) is a figure which shows the state which surrounded and clamped a pair of flange part from the outer peripheral side by a pair of holding parts, turning a division member centering on a hinge part, and covering from the upper part, FIG. 3C shows a state where the joining of the two flange pipes has been completed. FIG. 5C is a partially enlarged view of FIG. 5C for explaining the effect of the flange pipe joint structure according to the first embodiment, and FIG. 5A is an enlarged view of a D portion of FIG. ) Is an enlarged view of a portion E in FIG. It is a figure which shows the packing material which concerns on Example 2, A figure (a) is a front view, A figure (b) is a side view, A figure (c) is sectional drawing of the FF cross section of figure (a). It is a figure which shows the joining method which concerns on Example 2, The figure (a) mounted the lower end part of the flange part of a flange pipe in the groove part of a division member in the state which faced each flange part of two flange pipes roughly. The figure which shows a state, The figure (b) is a figure which shows the state which surrounded and clamped a pair of flange part from the outer peripheral side by a pair of holding parts, turning a division member centering on a hinge part, and covering from the upper part, FIG. 3C shows a state where the joining of the two flange pipes has been completed. It is a figure of the flange pipe and connection member which concern on a prior art example, a figure (a) is a perspective view, and a figure (b) is sectional drawing of the AA cross section of a figure (a). It is a figure which shows the problem of the joining structure which concerns on a prior art example, A figure (a) is a figure which shows the state which the flange part of a flange pipe interferes with a connection member, and cannot mount | wear, FIG. It is a figure which shows the state joined in the state which shifted | deviated from the mind.

Explanation of symbols

1A, 1B Flange pipe (resin pipe)
1Ab, 1Bb Flange 1Ac, 1Bc End face 1Ad, 1Bd Tapered face 1Ae Packing groove (positioning means)
2 Joining members 2U, 2L Dividing members 2Ua, 2La Nipping portions 2Ub, 2Lb Groove portions 2Ud, 2Ld Reverse taper surface H Hinge portion C Pressure fixing portions P1, P2 Packing material P2a Base portion (positioning means)
LA, LB axis

Claims (5)

Two resin pipes are joined by a joining member composed of a pair of divided members that surround and hold both flange parts from the outer peripheral side in a state where the respective flange parts of two resin pipes having flange parts at one end face each other. A flange pipe joining structure,
The joining member is openably and closably connected by a hinge portion, the holding portion having a groove portion that surrounds and sandwiches both the flange portions from the outer peripheral side, and the other split end portion can be fixed in a closed state, and A pressure contact fixing portion that enables the pair of holding portions to be pressure contacted in the diameter reducing direction, and
A taper surface is provided at the rear end portion in the abutting direction of each flange portion of the two resin pipes, and a reverse taper surface that is in contact with each taper surface in a nipped state is provided in each groove portion of the nipping portion,
A ring-shaped packing material is interposed between each end surface of the flange portion, and the flange portions are surrounded by the pair of sandwiching portions from the outer peripheral side in a state where the flange portions are substantially abutted, and sandwiched and pressed. The flange portions are guided by the reverse tapered surfaces of the groove portions, the axial centers of the resin tubes substantially coincide with each other, and the end surfaces on the abutting side of the resin tubes in which the packing material is interposed The flanged pipe joint structure is characterized in that they are pressed against each other.   The inclination angle of the taper surface of each flange portion with respect to the pipe direction of each resin pipe and the inclination angle of the reverse taper surface of each groove portion with respect to the pipe direction of each resin pipe are set equal to each other. The flange pipe joint structure according to claim 1.   The flange pipe joining structure according to claim 1 or 2, wherein a front end surface of the resin pipe in a butting direction is a flat surface.   The flange pipe joining structure according to any one of claims 1 to 3, wherein positioning means for positioning the packing material at an appropriate position between the front end surfaces of the two resin pipes in the abutting direction is provided.   The flanged pipe joint structure according to claim 1, wherein the resin pipe is a straight pipe, a bend pipe, or a T-shaped pipe.

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