JP2012229732A - Pipe structure with flange and method of constructing pipe structure with flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new pipe structure with a flange which is connectable to another pipe by simple work, and to provide a method of constructing the pipe structure with a flange.SOLUTION: A locking part 24 is formed on the outer circumferential surface 211 of a pipe body 2 by a roughening process. To form a glass fiber wound layer 51, a cable body 5 made of glass fibers is wound around the outer circumferential surface 211 of the pipe body 2, while leveling the concave and convex of the locking part 24. An adhesive resin layer 4 is formed by filling a gap 41 between the outer circumferential surface 211 of the pipe body 2 and the inner circumferential surface 311 of a short pipe 31 of the flange joint 3 with a thermosetting resin, while impregnating the thermosetting resin in the glass fiber wound layer 51 and hardening the resin.

Description

  The present invention relates to a flanged tubular structure in which a flange joint is fixed to a tubular body, and a construction method of the flanged tubular structure.

  In constructing a pipe line by connecting pipes, usually, means for receiving and inserting pipes to be connected and fixing with an adhesive (adhesive means), or flanges provided on each pipe Any means of a means (fastening means) for joining the joint surfaces of the portions and fixing them using a fastening member such as a bolt is used.

  When connecting pipe bodies by an adhesive means, unless the connection strength of the adhesive at the connection location is sufficiently increased, the pipe body may come off at the connection location when stress is applied to the pipeline.

  On the other hand, since the fastening means connects the tube bodies by fastening force such as bolts, the connection strength is very high compared to the bonding means. However, in performing the fastening means, it is assumed that flanges are provided between the connected pipe bodies. Therefore, when connecting pipes not provided with a flange part by fastening means, a member provided with a flange part at one end of a short pipe called a “flange joint” needs to be fixed to the pipe body. .

  When fixing a flange joint to a pipe body, fixing with an adhesive is generally performed. However, if the fixing strength with an adhesive is not sufficiently increased, the pipe body is subjected to stress when stress is applied to the pipe. Therefore, it is necessary to select an appropriate adhesive according to the material of the pipe body and the flange joint.

  However, for example, a composite pipe used as a high-pressure pipe or the like has poor adhesion of a glass fiber reinforced resin layer (FRP layer) laminated on its outer peripheral surface, and an adhesive is used for this type of composite pipe. Therefore, it was difficult to fix the flange joint with sufficient fixing strength.

  Therefore, when fixing a flange joint to this type of composite pipe, the FRP layer at the joint in the composite pipe is stripped to expose the hard vinyl chloride layer, and the exposed hard vinyl chloride layer and flange joint Means for interposing and fixing a filling adhesive between the inner peripheral surface and the inner peripheral surface is performed (for example, see Patent Document 1 below).

Japanese Patent Laid-Open No. 2003-207087

  However, when peeling off the FRP layer from the composite tube, the FRP layer in the composite tube was cut with a saw or the like while being careful not to cut into the hard vinyl chloride layer, and the part to be removed was heated with a burner or the like. After that, a very complicated work process such as peeling off the FRP layer using pliers or the like is required. In particular, in a composite pipe used as a high-pressure pipe, the FRP layer is provided so as to be very thick, making the stripping operation more difficult.

  The present invention has been developed to solve the above technical problem, and has a novel flanged tube structure in which a flange joint is fixed to a tube body with sufficient fixing strength, and the flanged tube body. It aims at providing the construction method of a structure.

  The flanged tube structure of the present invention is a flanged tube structure in which a flange joint is fixed to a tube body in which a glass fiber reinforced resin layer is laminated on the outer peripheral surface of a hollow cylindrical base tube. A pipe body in which a locking part with unevenness is provided on the surface, and a flange part is formed at one end of the short pipe, and the inner peripheral surface of the short pipe is opposed to the locking part Thus, the adhesive joint layer is formed by curing the flange joint that is sheathed on the tubular body, and the thermosetting resin that is filled in the gap existing between the outer peripheral surface of the tubular body and the inner peripheral surface of the short tube. And a flange joint that is externally mounted on the tube body is fixed to the tube body by the adhesive resin layer, and the tube is filled with at least irregularities of the engaging portion in the adhesive resin layer. Heat is applied to the glass fiber wrapping layer consisting of a glass fiber cord wound around the outer circumferential surface of the body. Of resin, characterized in that the glass fiber-containing unit which is cured by impregnating is formed (hereinafter, referred to as present invention pipes structure.).

  In the tubular structure of the present invention, the inner peripheral surface of the short tube is preferably a tapered surface whose diameter is continuously or gradually increased from the other end toward the one end.

  In the tubular structure of the present invention, the adhesive resin layer is formed of a glass mat, a glass cloth, or a glass fiber preform interposed between the glass fiber winding layer and the inner peripheral surface of the short tube. A preferred embodiment is one in which a shape-retaining material-containing part that has been impregnated and cured by a thermosetting resin is formed.

  In the tubular structure of the present invention, the glass fiber cord is preferably a glass fiber strand or roving.

  In the tubular structure of the present invention, the glass fiber cord is preferably a glass fiber bulky roving.

  In the tubular structure of the present invention, a preferred embodiment is one in which the glass fiber winding layer is made of a glass fiber cord wound around in a direction around the outer peripheral surface of the tubular body in a twisted state.

  The construction method of a tubular structure with a flange according to the present invention is a flange in which a flange portion is formed at one end of a short tube with respect to a tubular body in which a glass fiber reinforced resin layer is laminated on the outer peripheral surface of a hollow cylindrical base tube. A method for constructing a flanged tube structure for constructing a flanged tube structure in which a joint is fixed, and a latching portion forming step for forming a latching portion by subjecting the outer peripheral surface of the tube to unevenness processing. And a winding layer forming step of forming a glass fiber winding layer by winding a cord body made of glass fiber in a direction around the outer peripheral surface of the tube body while filling the unevenness of the engaging portion, and a short tube The outer periphery of the pipe body while impregnating the glass fiber winding layer with a thermosetting resin, with the flange joint outer sheathing step on the pipe body with the inner peripheral surface of the glass fiber winding layer facing the glass fiber winding layer Thermosetting tree in the gap between the surface and the inner peripheral surface of the short pipe Filled with a resin filling step of forming an adhesive resin layer by curing, characterized by the execution (hereinafter, referred to as the present invention method.).

  In the method of the present invention, in the resin filling step, the gap portion is sealed at one end side and the other end side of the short tube with the resin injection port and the air discharge port communicating with the gap portion secured, and from the resin injection port. It is preferable to fill the gap with the thermosetting resin by press-fitting the thermosetting resin toward the gap.

  In the method of the present invention, in the resin filling step, the gap portion is sealed at one end side and the other end side of the short tube in a state where the resin inlet and the air outlet leading to the gap portion are secured. It is preferable to fill the gap with the thermosetting resin by sucking air in the gap from the outlet and introducing a thermosetting resin into the gap from the resin inlet.

  According to the present invention, the flange joint can be fixed to the pipe body with a sufficient fixing strength by a simple operation.

FIG. 1 is a side sectional view showing a tubular structure of the present invention according to Embodiment 1. FIG. FIG. 2 is a side cross-sectional view showing a pipeline structure formed by joining the tubular structure of the present invention according to Embodiment 1 to another tubular body. 3 (a) to 3 (f) are side views showing a process of constructing the tubular structure of the present invention according to Embodiment 1, and show a cross-sectional state in FIGS. 3 (e) and 3 (f). Yes. Fig.4 (a) is side sectional drawing which shows the resin filling process at the time of constructing this invention pipe structure concerning Embodiment 1, and FIG.4 (b) and FIG.4 (c) are resin filling processes, respectively. It is the front view which shows the sealing disk used in, and side sectional drawing. FIG. 5 is a side cross-sectional view showing the tubular structure of the present invention according to the second embodiment. FIG. 6 is a side cross-sectional view showing a pipeline structure formed by joining the tubular structure of the present invention according to Embodiment 2 to another tubular body. 7 (a) to 7 (e) are side views showing a process of constructing the tubular structure of the present invention according to Embodiment 2, and show a cross-sectional state in FIGS. 7 (d) and 7 (e). . FIG. 8A is a side sectional view showing the tubular structure of the present invention according to Embodiment 3, and FIG. 8B is a perspective view showing a shape-retaining material used when constructing the tubular structure of the present invention. FIG. 9 (a) and 9 (b) are perspective views showing the plate material A and the plate material B used in the fixed strength test, respectively, and FIG. 9 (c) and FIG. 9 (d) create a test piece. It is explanatory drawing which shows the process to do.

  Hereinafter, although an embodiment of the present invention is described based on a drawing, the present invention is not limited to this embodiment.

<Embodiment 1>
-Tube structure 1 of the present invention-
A tubular structure 1 of the present invention according to this embodiment shown in FIG. 1 includes a tubular body 2, a flange joint 3, and an adhesive resin layer 4.

  The tube body 2 is a hollow cylindrical composite tube in which the outer periphery of a rigid polyvinyl chloride tube as the base tube 21 is reinforced with a glass fiber reinforced resin layer 22 (caliber 300 mm (tube outer diameter 354 mm, tube inner diameter 288 mm)). . The outer peripheral surface 211 of the tubular body 2 is provided with a plurality of concave grooves (depth 5 mm, width 10 mm) 23 that circulate around the outer peripheral surface 211, thereby forming a locking portion 24.

  The flange joint 3 is formed using glass fiber reinforced resin as a raw material, and an annular flange portion 32 is formed at one end 312 of the hollow cylindrical short tube 31. The flange joint 3 is externally attached to the tubular body 2 at a position where the inner peripheral surface 311 of the short pipe 31 faces the locking portion 24 provided on the tubular body 2. The length from the one end 312 to the other end 313 of the short tube 31 (the tube length of the short tube 31) is 185 mm.

  The flange portion 32 becomes a joint surface 321 that faces a flange portion F provided in another pipe body P and a surface opposite to the joint surface 321 when joining to another pipe body P described later. It has a back surface 322. The flange portion 32 is provided with a connection hole 323 that penetrates the flange portion 32 near the outer edge thereof. The connection hole 323 is a portion into which a fastening member such as a bolt used for connection with another pipe P described later is inserted.

  The adhesive resin layer 4 is formed by curing a thermosetting resin filled in the gap 41 existing between the outer peripheral surface 211 of the tube body 2 and the inner peripheral surface 311 of the short tube 31. In this embodiment, an unsaturated polyester resin is used as the thermosetting resin.

  Further, a glass fiber winding formed by winding a fiber optic cord body 5 on the adhesive resin layer 4 in a direction around the outer peripheral surface 211 of the tube body 2 while filling the concave groove 23 of the locking portion 24. A glass fiber containing portion 52 that is impregnated and cured with a thermosetting resin is formed on the attachment layer 51. That is, the glass fiber-containing portion 52 is a portion reinforced by the glass fiber winding layer 51 in the adhesive resin layer 4. A part of the glass fiber-containing part 52 is cured in a state of being fitted into the concave groove 23 existing in the locking part 24.

  When the gap portion 41 is filled with a thermosetting resin and the thermosetting resin is cured to form the adhesive resin layer 4, the flange joint 3 is connected to the pipe with the adhesive resin layer 4 interposed in the gap portion 41. Fixed to the body 2. That is, the outer peripheral surface 211 of the tube body 2 and the adhesive resin layer 4 are bonded and fixed by the adhesive force of the thermosetting resin, and further, the inner peripheral surface 311 of the short pipe 31 in the flange joint 3 and the adhesive resin layer 4 are bonded. The adhesive is fixed by the adhesive force of the thermosetting resin.

  In this embodiment, since a part of the glass fiber containing part 52 reinforced by the glass fiber winding layer 51 is fitted in the concave groove 23 existing in the locking part 24, the glass fiber containing part 52 The portion fitted in the locking portion 24 becomes an anchor, and the outer peripheral surface 211 of the tubular body 2 and the adhesive resin layer 4 are in a physically fitted state. Thereby, the flange joint 3 is fixed to the tube body 2 with sufficient fixing strength.

  In the present embodiment, the locking portion 24 is formed by providing a plurality of concave grooves 23 having a depth of 5 mm and a width of 10 mm on the outer peripheral surface 211 of the tubular body 2. The width is not particularly limited as long as there is a depth that allows the glass fiber cord 5 to be fitted when the glass fiber cord 5 is wound around the locking portion 24. . Specifically, the depth of the concave groove 23 is preferably about 1 to 10 mm, and the width is preferably about 1 to 30 mm. In addition, the groove 23 is not limited to the direction formed around the outer peripheral surface 211 of the tube body 2, and the outer peripheral surface 211 of the tube body 2 is formed into a spiral groove that spirals around the outer periphery surface of the tube body 2. 211 may be formed by roughening with a sander or the like. However, if the depth of the concave groove 23 is too deep and the hard vinyl chloride tube as the base tube 21 of the tubular body 2 is exposed at the bottom of the concave groove 23, the strength of the tubular body 2 may be insufficient. The depth of the groove 23 is preferably within 50% of the thickness of the glass fiber reinforced resin layer 22.

  Further, as shown in FIG. 2, the tubular structure 1 of the present invention forms the duct structure 10 by joining the flange portion 32 to the flange portion F of another tubular body P. P is particularly limited as long as it has a flange portion F that can be joined to the flange portion 32 in the tubular structure 1 of the present invention and can form the conduit structure 10 together with the tubular structure 1 of the present invention. It is not a thing. As another pipe P, a straight pipe, a curved pipe, a socket, a sleeve, cheese, a reducer, an increaser, a header, a cap, etc. can be mentioned, for example. Of course, the pipe structure 10 may be formed by joining the tubular structures 1 of the present invention.

-Method of the present invention-
Subsequently, the method of the present invention for constructing the tube structure 1 of the present invention according to Embodiment 1 will be described.

  The method of the present invention executes a locking portion forming step, a wound layer forming step, a flange joint exterior step, and a resin filling step.

  In the locking portion forming step, the locking portion 24 is formed by performing uneven processing on the outer peripheral surface 211 of the tube body 2. In this embodiment, as shown to Fig.3 (a), the latching | locking part 24 was formed in the outer peripheral surface 211 of the tubular body 2 by providing the multiple groove | channel 23 which goes around the outer peripheral surface 211. As shown in FIG. The concave groove 23 is provided by groove processing by a lathe (corresponding to the concave-convex processing in the claims), and the opening of the tube body 2 (when connecting to another tube body P to be described later) 5 is provided on the outer peripheral surface 211 of the tubular body 2 at a constant pitch after taking a margin t of a constant distance from the opening 25 on the connection side.

  In the winding layer forming step, the glass fiber winding layer 51 is formed by winding the cable body 5 made of glass fiber in a direction around the outer peripheral surface 211 of the tube body 2 while filling the unevenness of the locking portion 24. To do. In the present embodiment, the glass fiber cord 5 is passed through the unsaturated polyester resin solution, and then the glass fiber cord (glass fiber roving) 5 is wound along one concave groove 23. Yuki (refer to FIG. 3B), when one concave groove 23 is filled by the wound glass fiber cord 5, the glass fiber cord 5 is wound along the other adjacent groove 23 ( 3 (c)), after all the concave grooves 23 are filled with the glass fiber cord 5, the glass fiber cord 5 is wound so as to cover the entire locking portion 24. The attached layer 51 was formed (see FIG. 3D).

  In the flange joint exterior process, the flange joint 3 is exteriorized on the tubular body 2 with the inner peripheral surface 311 of the short pipe 31 facing the glass fiber winding layer 51. In the present embodiment, the tubular body 2 is inserted into the short pipe 31 of the flange joint 3, and the flange joint 3 is moved to a position where the inner peripheral surface 311 of the short pipe 31 faces the glass fiber winding layer 51. As a result, the flange joint 3 was sheathed on the tube body 2 (see FIG. 3E).

  In the resin filling step, the glass fiber winding layer 51 is impregnated with a thermosetting resin, and the gap 41 existing between the outer peripheral surface 211 of the tube body 2 and the inner peripheral surface 311 of the short tube 31 is thermosetting. The adhesive resin layer 4 is formed by filling and curing the resin (see FIG. 3F).

  In the present embodiment, the thermosetting resin is injected into the gap 41 in a state where the resin inlet 61 and the air outlet 62 leading to the gap 41 are secured, and the gap 41 is connected to the one end 312 side of the short pipe 31. The sealing was performed on the other end 313 side, and a thermosetting resin was press-fitted from the resin injection port 61 toward the gap 41 (see FIG. 4A).

  Sealing on the one end 312 side of the short tube 31 was performed using a sealing disk 6 shown in FIGS. The sealing disk 6 has a certain thickness, and the front shape thereof is a disk shape having substantially the same diameter as the flange portion 32 of the flange joint 3. The sealing disk 6 is provided with a plurality of attachment holes 63 penetrating the front and back near the outer edge. Each mounting hole 63 is opposed to each connection hole 323 provided in the flange portion 32 when the sealing disk 6 is disposed in a state facing the joint surface 321 in the flange portion 32, and a continuous through hole is formed. To form. Therefore, if a fastening member such as a bolt is passed through a through hole in which the attachment hole 63 and the connection hole 323 are continuous and fastened, the sealing disk 6 is attached to the flange portion 32, and one end 312 of the short pipe 31. The side is sealed.

  When the sealing disc 6 is attached to the flange portion 32, an annular thick portion 64 is provided at a position in contact with the gap portion 41 in the sealing disc 6. In this thick portion, four small holes (61, 62) penetrating the sealing disk 6 are provided with a phase difference of 45 degrees. Among the small holes, when the sealing disk 6 is attached to the flange portion 32, the small hole positioned at the lowest position becomes the resin injection port 61 and the other through holes become the air discharge ports 62.

  On the other hand, sealing on the other end 313 side of the short tube 31 is a cured body of glass fiber reinforced resin formed on the other end 313 side of the short tube 31 by a hand lay-up method using a glass cloth and a thermosetting resin. The temporary fixing member 8 is provided, and the temporary fixing member 8 is used to seal the gap on the other end 313 side of the short pipe 31.

  As described above, when the gap 41 is sealed at the one end 312 side and the other end 313 side of the short pipe 31 and thermosetting resin is press-fitted from the resin inlet 61 toward the gap 41, the gap 41 is inserted into the gap 41. The thermosetting resin is filled while extruding the existing air, and the extruded air is sequentially discharged from the air discharge port 62. Thereby, the adhesive resin layer 4 with little air remaining (void) can be formed.

  In the present embodiment, in the winding layer forming step, the glass fiber cord 5 is used as the unsaturated polyester resin solution so that the thermosetting resin is efficiently impregnated into the glass fiber winding layer 51. For example, when a thermosetting resin having a low viscosity and high permeability into the glass fiber winding layer 51 is used, the glass fiber cord 5 may be directly wound as it is. good.

<Embodiment 2>
-Tube structure 1 of the present invention-
A tubular structure 1 of the present invention according to this embodiment shown in FIG. 5 includes a tubular body 2, a flange joint 3, and an adhesive resin layer 4.

  The tubular body 2 is the same as the tubular body 2 used in the first embodiment.

  In the flange joint 3, the inner peripheral surface 311 of the short pipe 31 is a tapered surface that continuously increases the inner diameter from the other end 313 toward the one end 312. The short pipe 31 of the flange joint 3 is provided with a resin injection port 61 that penetrates the pipe wall of the short pipe 31. Further, at one end 312 of the short pipe 31 of the flange joint 3, an annular sealing portion 64 is provided so as to protrude in the axial direction of the short pipe 31 and to circulate along the inner peripheral surface 311. Thus, an air outlet 62 penetrating the sealing portion 64 is formed at a predetermined location of the sealing portion 64.

  When the flange joint 3 is viewed from the one end 312 side of the short tube 31, the air discharge port 62 and the resin injection port 61 have the central axis of the short tube 31. The positional relationship is arranged with a phase difference of 180 degrees as the base axis. Therefore, as shown in FIG. 5, if the resin inlet 61 is positioned below the tube 2, the air outlet 62 is positioned above the tube 2. The remainder of the flange joint 3 is the same as that of the flange joint 3 used in the first embodiment.

  The adhesive resin layer 4 is formed by curing a thermosetting resin filled in the gap 41 existing between the outer peripheral surface 211 of the tube body 2 and the inner peripheral surface 311 of the short tube 31. In the present embodiment, an epoxy resin is used as the thermosetting resin.

  Further, a glass fiber winding formed by winding a fiber optic cord body 5 on the adhesive resin layer 4 in a direction around the outer peripheral surface 211 of the tube body 2 while filling the concave groove 23 of the locking portion 24. A glass fiber containing portion 52 that is impregnated and cured with a thermosetting resin is formed on the attachment layer 51.

  As shown in FIG. 6, the pipe structure 1 of the present invention forms the pipe structure 10 by joining the flange portion 32 to the opening of another pipe P. For example, when the pipe structure 10 is used for high-pressure piping or the like and fluid is pumped into the pipe line (indicated by a broken line arrow in the figure), the internal pressure IP in the pipe line increases and the internal pressure IP is received. The pipe body 2 tries to move toward the right side in the figure. In the case where another pipe body P is a curved pipe or the like, a thrust force is generated when the fluid pumped into the pipe line collides with the bending angle of the pipe body P. The tube P attempts to move to the left side in the figure. At the same time, the flange portion F provided at the opening of another pipe P also tries to move to the left in the figure.

  At this time, in this embodiment, since the inner peripheral surface 311 of the short pipe 31 is a tapered surface, the adhesive resin layer 4 interposed between the tube body 2 and the flange joint 3 is a so-called “wedge”. Function as. This suitably prevents the flange joint 3 from coming out of the tube body 2.

-Method of the present invention-
Next, the method of the present invention for constructing the tube structure 1 of the present invention according to Embodiment 2 will be described.

  The method of the present invention executes a locking portion forming step, a wound layer forming step, a flange joint exterior step, and a resin filling step.

  In this embodiment, the latching | locking part formation process formed the latching | locking part 24 by performing in the procedure similar to the said Embodiment 1 (refer Fig.7 (a)). In the present embodiment, the tube body 2 is inserted into the short tube 31 of the flange joint 3 after the locking portion forming step and before the winding layer forming step described later, and the flange is formed along the tube body 2. By moving the joint 3, the flange joint 3 was arranged at a position farther from the locking portion 24 (see FIG. 7B).

  In the present embodiment, the wound layer forming step was performed in the same procedure as in the first embodiment, thereby forming the glass fiber wound layer 51 (see FIG. 7C).

  In the flange joint exterior process, the tubular body is obtained by moving the flange joint 3 arranged on the back side from the locking portion 24 to a position where the inner peripheral surface 311 of the short pipe 31 faces the glass fiber winding layer 51. The flange joint 3 was externally attached to 2 (see FIG. 7D).

  In the resin filling process, with the resin inlet 61 and the air outlet 62 communicating with the gap 41 secured, the gap 41 is sealed at the one end 312 side and the other end 313 side of the short pipe 31 to remove the air. The air in the gap 41 is sucked from the outlet 62 and a resin is filled in the gap 41 by introducing a thermosetting resin into the gap 41 from the resin inlet 61 (see FIG. 7E). .

  In this resin filling step, sealing on the one end 312 side of the short tube 31 is performed by filling a gap existing at one end 312 of the short tube 31 with resin R, and sealing on the other end 313 side of the short tube 31 is short. This was performed by filling the gap existing on the other end 313 side of the pipe 31 with the resin R.

  As described above, the gap 41 is sealed at the one end 312 side and the other end 313 side of the short pipe 31, and air existing in the gap 41 is sucked from the air discharge port 62 and the gap 41 from the resin injection port 61. If the thermosetting resin is introduced toward the surface, the adhesive resin layer 4 with less air remaining (voids) can be formed.

<Embodiment 3>
-Tube structure 1 of the present invention-
The tubular structure 1 of the present invention according to this embodiment shown in FIG. 8A includes a tubular body 2, a flange joint 3, and an adhesive resin layer 4.

  The tubular body 2 is the same as the tubular body 2 used in the first embodiment.

  In the flange joint 3, the inner peripheral surface 311 of the short pipe 31 is a tapered surface that continuously increases the inner diameter from the other end 313 toward the one end 312.

  The adhesive resin layer 4 is formed by curing a thermosetting resin filled in the gap 41 existing between the outer peripheral surface 211 of the tube body 2 and the inner peripheral surface 311 of the short tube 31. In this embodiment, an unsaturated polyester resin is used as the thermosetting resin.

  Further, a glass fiber winding formed by winding a fiber optic cord body 5 on the adhesive resin layer 4 in a direction around the outer peripheral surface 211 of the tube body 2 while filling the concave groove 23 of the locking portion 24. A glass fiber containing portion 52 that is impregnated and cured with a thermosetting resin is formed on the attachment layer 51.

  Furthermore, the adhesive resin layer 4 is formed with a shape-retaining material-containing portion 7 in which a shape-retaining material 71 made of a glass fiber preform is impregnated with a thermosetting resin and cured. The shape-retaining material 71 is obtained by forming a glass mat by forming a number of continuous glass fiber strands into a mat shape using an organic binder made of a thermoplastic resin, and then compressing the glass mat while heating it. (Refer FIG.7 (b)). The convex curved surface 72 of the shape retaining material 71 has a shape along the inner peripheral surface 311 (tapered surface) of the short pipe 31 in the flange joint 3. The shape-retaining material-containing portion 7 is arranged so that a plurality of (2 in this embodiment) shape-retaining materials 71 cover the periphery of the glass fiber winding layer 51, and in this state, the gap portion 41 is thermosetting. When the resin is filled, the thermosetting resin is impregnated into the shape retaining material 71 and cured. That is, the shape-retaining material-containing portion 7 is a part that reinforces the adhesive resin layer 4 with the shape-retaining material 71. Thereby, the shape retention property of the adhesive resin layer 4 is improved.

  In addition, this invention pipe structure 1 which concerns on this embodiment can be constructed | assembled in the procedure substantially the same as the method of this invention demonstrated in the said Embodiment 1. FIG.

<Fixed strength test>
[Example 1]
As a pseudo tubular body A simulating the tubular body 2 in the tubular structure 1 of the present invention, a plate-like body (vertical x30 mm × horizontal y15 mm × thickness z28 mm) formed by laminating a glass fiber reinforced resin layer G on the surface of the hard vinyl chloride layer V. (The thickness of the hard vinyl chloride layer V is 12 mm, the thickness of the glass fiber reinforced resin layer G is 16 mm)). A concave groove 23 having a depth of 3 mm and a width of 6 mm is formed along the lateral width direction on the surface of the pseudo tube A on which the glass fiber reinforced resin layer G is laminated (FIG. 9A). )reference).

  As a pseudo flange joint B imitating the flange joint 3 in the tubular structure 1 of the present invention, a glass cloth (manufactured by Nittobo Co., Ltd., trade name: WR570C (count: 570)) and an unsaturated polyester resin (manufactured by Iupika Co., Ltd., trade name) : A plate-like body (length x30 mm, width y15 mm × thickness z20 mm) formed by impregnating and curing Iupica 4516). Note that a taper surface is formed on one surface of the plate material B to reduce its thickness from 20 mm to 15 mm from one end B1 to the other end B2 along the vertical direction, and a support protrusion having a height of 5 mm is formed at the other end B2. B3 is provided (see FIG. 9B).

  Winding glass roving (manufactured by Nittobo Co., Ltd., trade name: RSE240RL (count: 2400 g / 1000 m)) as a fiberglass cord 5 over the whole pseudopipe A while filling the concave groove 23 formed in the pseudopipe A A glass fiber winding layer 51 is formed by turning (see FIG. 9C), and then the glass winding layer in the pseudo tubular body A is prepared after aligning the vertical and horizontal directions of the pseudo tubular body A and the pseudo flange joint B. The tapered surface of the pseudo flange joint B is applied to the surface on which the 51 is formed, and further, an unsaturated polyester resin (manufactured by Iupika Co., Ltd., product name: Iupica 4516) as a thermosetting resin is used as the pseudo tubular body A and the pseudo flange joint. By filling and curing the gap 41 existing between B and the pseudo tube A and the pseudo flange joint B, the thermosetting resin hardened body (adhesive resin layer 4) is fixed. It was obtained consisting specimen T (see FIG. 9 (d)).

  This test piece T is a pseudo manifestation of the tubular structure 1 of the present invention, where the pseudo tube A is the tube 2, the pseudo flange joint B is the short pipe 31 in the flange joint 3, and the thermosetting resin is cured. The body corresponds to the adhesive resin layer 4.

[Example 2]
A test piece T was prepared in the same manner as in Example 1 except that the glass roving as the glass fiber cord 5 was twisted and wound around the pseudo tubular body A.

[Example 3]
A test piece T was prepared in the same manner as in Example 1 except that bulky roving (manufactured by Nittobo Co., Ltd., trade name: RS310AT025AS (count: 3000 g / 1000 m)) was used as the glass fiber cord 5.

[Comparative example]
Roughened the bonded part of the FRP layer of the pseudo tubular body A and the pseudo flange joint B with No. 100 sanding paper, and an epoxy resin adhesive (product name: Eslon 400 #, made by Sekisui Chemical Co., Ltd.) on the surface A test piece T was prepared by coating and pressure bonding.

-Evaluation of fixed strength-
The test pieces T obtained in Examples 1 to 3 and Comparative Example were subjected to a shear bond strength test in accordance with JIS K6825 “Adhesive Compression Shear Test Method”. Table 1 shows the obtained shear bond strength and the results of trial calculation of the water pressure resistance based on the shear bond strength.

The water pressure resistance is
Axial force = water pressure resistance x π x (inner diameter of tube / 2) ²
Adhesion area = outer diameter of tube x length of short pipe of flange joint Shear force = axial force / bonding area Based on the obtained shear bond strength, the water pressure resistance of the tubular structure 1 of the first embodiment of the present invention is estimated. It is a thing.

  From the results shown in Table 1, the shear bond strength of the test pieces T according to Examples 1 to 3 is a very large value compared to the shear bond strength of the test piece T according to the comparative example fixed only with the adhesive. It was confirmed that

  Further, the test piece T according to Example 2 in which the glass roving as the glass fiber cord 5 was twisted and the test piece T according to Example 3 using the bulky roving as the glass fiber cord 5 were either Was 20 MPa or more, and it was confirmed that the value was twice or more compared with the shear bond strength of the test piece T according to the comparative example. This is because the glass fiber is oriented in the thickness direction of the pseudo tubular body A when the glass roving as the glass fiber cord 5 is wound while being twisted or when the bulky roving is used as the glass fiber cord 5. As a result, it is expected that the shear bond strength is improved.

  The present invention makes it possible to join pipes together by a simple operation, and makes it very easy to connect multi-layer pipes and the like, which have conventionally been very complicated.

1 Tube structure of the present invention (tube structure with flange)
2 Tube 21 Base tube 211 Outer peripheral surface 22 Glass fiber reinforced resin layer 23 Groove 24 Locking portion 3 Flange joint 31 Short tube 311 Inner peripheral surface 312 One end 313 Other end 32 Flange portion 4 Adhesive resin layer 41 Gap portion 5 Glass fiber Cable body 51 Glass fiber winding layer 52 Glass fiber containing portion 6 Sealing disk 61 Resin inlet 62 Air outlet 63 Mounting hole 64 Sealing portion 7 Shape retaining material containing portion 71 Shape retaining material 72 Curved surface 10 Pipe line Construction

Claims (9)

A flanged tubular structure in which a flange joint is fixed to a tubular body in which a glass fiber reinforced resin layer is laminated on the outer peripheral surface of a hollow cylindrical base tube,
A tubular body provided with a locking portion provided with irregularities on the outer peripheral surface;
A flange joint is formed on one end of the short pipe, and the outer peripheral surface of the short pipe is opposed to the locking part, with the flange joint being sheathed on the tubular body,
An adhesive resin layer formed by curing a thermosetting resin filled in a gap existing between the outer peripheral surface of the tubular body and the inner peripheral surface of the short tube;
Comprising
The flange joint sheathed on the tubular body is fixed to the tubular body by the adhesive resin layer,
In the adhesive resin layer, a thermosetting resin is formed on a glass fiber winding layer made of a glass fiber cord wound in a direction around the outer peripheral surface of the tubular body with at least the concave and convex portions of the locking portion being buried. A flanged tubular structure characterized in that a glass fiber-containing portion impregnated and cured is formed. In the tube structure with a flange according to claim 1,
A flanged tube structure in which the inner peripheral surface of the short tube is a tapered surface whose inner diameter is increased continuously or stepwise from the other end to the one end. In the tubular structure with a flange according to claim 1 or 2,
The adhesive resin layer is impregnated with a thermosetting resin in a shape retaining material made of glass mat, glass cloth or glass fiber preform interposed between the glass fiber winding layer and the inner peripheral surface of the short tube. A tubular structure with a flange formed by forming a shape-retaining material-containing portion that has been cured. In the tube structure with a flange according to any one of claims 1 to 3,
A tube structure with a flange, in which the glass fiber cord is a strand or roving of glass fiber. In the tube structure with a flange according to any one of claims 1 to 3,
A flanged tube structure in which the glass fiber cord is a bulky roving of glass fiber. In the tube structure with a flange according to claim 4 or 5,
A flanged tube structure comprising a glass fiber cord wound in a direction in which the glass fiber wound layer wraps around the outer peripheral surface of the tube in a twisted state. Constructs a flanged tube structure in which a flange joint with a flange formed on one end of a short tube is fixed to a tube with a glass fiber reinforced resin layer laminated on the outer peripheral surface of a hollow cylindrical base tube A method for constructing a flanged tubular structure,
An engaging portion forming step for forming an engaging portion by performing uneven processing on the outer peripheral surface of the tubular body,
A winding layer forming step of forming a glass fiber winding layer by winding a cord made of glass fiber in a direction of circling the outer peripheral surface of the tubular body while filling the unevenness of the locking portion,
In a state where the inner peripheral surface of the short pipe is opposed to the glass fiber winding layer, a flange joint exterior process for sheathing the flange joint on the tubular body,
Adhesive resin layer by filling thermosetting resin in the gap between the outer peripheral surface of the tube and the inner peripheral surface of the short tube and curing it while impregnating the glass fiber winding layer with the thermosetting resin A resin filling step to form
The construction method of the tubular structure with a flange characterized by performing this. In the construction method of the tube structure with a flange according to claim 7,
In the resin filling process, with the resin inlet and air outlet leading to the gap, the gap is sealed at one end and the other end of the short tube, and heat is transferred from the resin inlet toward the gap. A method for constructing a flanged tubular structure in which a gap portion is filled with a thermosetting resin by press-fitting a curable resin. In the construction method of the tube structure with a flange according to claim 7,
In the resin filling process, with the resin inlet and air outlet leading to the gap, the gap is sealed at one end and the other end of the short tube, and the air in the gap is sucked from the air outlet. And a method for constructing a flanged tubular structure in which a thermosetting resin is introduced into the gap by introducing a thermosetting resin into the gap from a resin injection port.

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