JP2012145201A - Pipe structure with flange and pipeline structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new pipe structure with a flange, in which a flange joint is fixed to a pipe body with sufficient fixing strength by simple work, and to provide a pipeline structure in which the pipe structure with the flange is connected to another pipe body.SOLUTION: A flange joint 3 in the inner peripheral face 313 of which a projected or recessed second engaging part 314 is provided, is externally fitted to a pipe body 2 in the outer peripheral face 22 of which a projected or recessed first engaging part 21 is provided. The flange joint 3 is fixed to the pipe body 2 with a reinforced material layer 5 which is formed by overlaying a fiber-reinforced resin in an area from an outer peripheral face of a short pipe 31 of the flange joint 3 to the outer peripheral face 22 of the pipe body 2 while filling an annular level difference formed between the pipe body 2 and the short pipe 31 of the flange joint 3, and curing 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 pipe line structure in which the flanged tubular structure is connected to another tubular body.

  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 (fastening means) for abutting the joint surfaces of the parts 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, when performing the fastening means, it is assumed that each connected pipe body has a flange portion. Therefore, when connecting pipes that are not provided with a flange part by fastening means, it is necessary to fix a member provided with a flange part on the outer peripheral surface of a short pipe called a “flange joint” to the pipe body. Arise.

  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 glass fiber reinforced composite pipe used as a high-pressure pipe or the like has poor adhesion of an FRP (fiber reinforced resin) layer existing on the outer peripheral surface thereof, and an adhesive is used for this type of composite pipe. 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 is a novel flanged tube structure in which a flange joint is fixed to the tube with sufficient fixing strength by a simple operation, and An object of the present invention is to provide a pipe structure in which the flanged tubular structure is connected to another tubular body.

  The flanged tubular structure of the present invention is a flanged tubular structure in which a flange joint is fixed to the tubular body, and this flanged tubular structure has a flange portion on the outer peripheral surface of the tubular body and the short pipe. A flange joint provided, and a convex or concave first engaging portion is provided on the outer peripheral surface of the tubular body, and the flange joint extends from one open end to the other open end of the short pipe. Is an aggregate of a plurality of divided bodies divided by a plurality of slit portions that cut the short tube together with the flange portion, and is provided with a convex or concave second engaging portion on the inner peripheral surface of the short tube In the state where the first engagement portion and the second engagement portion are engaged with each other, a flange joint is sheathed on the tube, and further, it is generated between the outer peripheral surface of the tube and the outer peripheral surface of the short tube. The fiber reinforced resin is built up from the outer peripheral surface of the short pipe to the outer peripheral surface of the pipe body while filling the step , The reinforcement layer cured, flange joint is characterized by comprising fixed to the tube (hereinafter, referred to as present invention pipes structure.).

  In the tubular structure of the present invention, a preferred embodiment is one in which an adhesive layer or a pressure-sensitive adhesive layer is interposed in a gap existing between the outer peripheral surface of the tubular body and the inner peripheral surface of the short tube.

  In the tubular structure of the present invention, a preferred embodiment is one in which a filler made of an adhesive layer, a pressure-sensitive adhesive layer, or an elastic body is interposed in the slit portion.

  The pipe line structure of the present invention is characterized in that the flange part in the pipe structure of the present invention is connected to a flange part provided in an opening of another pipe body.

  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 an exploded perspective view showing a pipe body and a flange joint constituting the pipe structure of the present invention. 2 (a) and 2 (b) are side views showing the steps of constructing the tubular structure of the present invention, and (c) is a side view showing the tubular structure of the present invention in a partially sectional state. FIG. 3 is a side view showing a part of the pipe structure of the present invention formed by joining the pipe structure of the present invention to another pipe in a cross-sectional state. FIG. 4 is a side view showing a partially cross-sectional view of a pipe structure of the present invention formed by joining a pipe structure of the present invention constructed using a flange joint of another shape to another pipe. FIG. 5 is an exploded perspective view showing a pipe body and a flange joint constituting another pipe structure of the present invention. FIG. 6 is a side view showing another tubular structure of the present invention in a partially sectional state.

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

  FIG. 1 shows a tube body 2 and a flange joint 3 constituting the tube structure 1 of the present invention.

  The tubular body 2 has a cylindrical shape formed by a “filament winding method” in which a reinforcing fiber impregnated with a resin is wound around a cylindrical polyvinyl chloride tube (liner) having a nominal diameter of 300 A and cured in a heat curing furnace. It is a glass fiber reinforced composite tube.

  The tubular body 2 is provided with a plurality of annular groove portions as the first engaging portions 21 on the outer peripheral surface 22 thereof. The first engaging portion 21 is provided by groove processing with a lathe. The first engaging portion 21 has an allowance width X of a certain distance from the end face of the connection opening 23 in the tubular body 2 and then the outer peripheral surface 22 of the tubular body 2. Are provided at a constant pitch.

  Table 1 below shows details of the material of the tube 2 and the forming means.

  The flange joint 3 has a shape in which an annular flange portion 32 having a circular outer edge shape is provided on the outer peripheral surface of a cylindrical short pipe 31 (nominal diameter 400A). In the present embodiment, the flange portion 32 is provided at the periphery of the one open end 311 of the short tube 31 so that the end surface of the one open end 311 of the short tube 31 is flush with the joint surface 321 of the flange portion 32. . On the other hand, the end surface of the other open end 312 of the short pipe 31 protrudes from the back surface 322 of the flange portion 32.

  The flange joint 3 includes a plurality of pieces (two in this embodiment) divided by a plurality of slits 33 (two in this embodiment) that cut the short pipe 31 together with the flange 32 from one open end 311 to the other open end 312 of the short pipe 31. In the present embodiment, it is an aggregate of 2) divided bodies 3A and 3B. That is, in the present invention, the flange joint 3 is divided according to the number of the slit portions 33. The flange joint 3 is usually divided into 2 to 4 pieces.

  The flange joint 3 is short using a “RTM method (Resin Transfer Molding)” in which a fiber base material is placed in a pair of male and female molds, a resin is injected from a resin inlet, and the fiber base material is impregnated and molded. The tube 31 and the flange portion 32 are formed integrally.

  The inner peripheral surface 313 of the short pipe 31 is a curved surface that can be along the outer peripheral surface 22 of the tube body 2, and a plurality of annular convex portions as the second engaging portions 314 are provided on the inner peripheral surface 313. ing. The second engaging portion 314 is integrally formed when the flange joint 3 is formed by the RTM method. The second engaging portion 314 has an allowance width Y of a certain distance larger than the thickness of the flange portion 32 from one opening end 311 in the short tube 31 and then 5 at a constant pitch on the inner peripheral surface of the short tube 31. Articles are provided. In the present embodiment, the allowance width Y given to the short pipe 31 is the same length as the allowance width X given to the tubular body 2.

  The flange portion 32 is provided with a plurality of through holes 323 penetrating from the joint surface 321 to the back surface 322. This through-hole 323 becomes a part into which a fastening member such as a bolt used for connection with the pipe body P described later is inserted.

  Table 2 below shows details of the material and molding means of the flange joint 3.

  In the present embodiment, the filler 4 is interposed in the slit portion 33 in the flange joint 3. In the present embodiment, silicone rubber processed according to the end face shape of the slit portion 33 is used as the filler 4.

  In constructing the tubular structure 1 of the present invention by fixing the flange joint 3 to the tubular body 2, first, between the outer peripheral surface 22 of the tubular body 2 and the inner peripheral surface 313 of the short pipe 31 in the flange joint 3. 2, the adhesive layer or the pressure-sensitive adhesive layer is interposed, and the first engagement portion 21 provided on the tube body 2 and the second joint provided on the flange joint 3 as shown in FIG. The flange joint 3 is sheathed on the tube body 2 in a state where the engaging portion 314 is engaged with each other. When an adhesive layer or a pressure-sensitive adhesive layer is interposed in the gap existing between the outer peripheral surface 22 of the tube body 2 and the inner peripheral surface 313 of the short tube 31, the gap existing between the tube body 2 and the short tube 31 is filled. The sealing property between each member is improved.

  In this embodiment, since the allowance width X given to the tubular body 2 and the allowance width Y given to the short pipe 31 are set to the same length, the first engagement portion 21 and the second engagement portion 314 are set. When the flange joint 3 is sheathed on the pipe body 2 with the male and female engaged, the end face of the connection opening 23 in the pipe body 2 and the joint surface 321 in the flange joint 3 are flush with each other.

  The filler 4 is interposed in the gap between the split bodies 3 </ b> A and 3 </ b> B of the flange joint 3, i.e., the slit portion 33 provided in the flange joint 3. Thereby, the sealing property of the slit part 33 improves. The filler 4 is preferably fixed to the end face of the slit portion 33 by adhesion or fitting.

  When the flange joint 3 is sheathed on the tubular body 2, a step G is generated between the outer peripheral surface 22 of the tubular body 2 and the outer peripheral surface of the short pipe 31. In the present embodiment, the reinforcing material layer 5 is formed by filling and curing the fiber reinforced resin from the outer peripheral surface of the short pipe 31 to the outer peripheral surface 22 of the tubular body 2 while filling the step G (FIG. 2). (See (b) and (c)). In this embodiment, when forming the reinforcing agent layer 5, a fiber base material is shaped in advance on the portion where the fiber reinforced resin is built up, and then impregnated with the resin using a brush or a roller, and defoamed. However, a “hand lay-up method” of laminating to a predetermined thickness was used.

  Thereby, this invention pipe structure 1 is constructed | assembled. In other words, the tubular structure 1 of the present invention has a flange on the tubular body 2 by the male-female engagement between the first engaging portion 21 and the second engaging portion 314 and the reinforcing material layer 5 made of the piled fiber reinforced resin. The joint 3 is fixed.

  Here, as the fiber reinforced resin is thickened from the outer peripheral surface of the short pipe 31 to the outer peripheral surface of the tubular body 2, the flange joint 3 is more firmly fixed to the tubular body 2 as the thickness of the fiber reinforced resin is increased. Is done. Further, the larger the overlap allowance of the fiber reinforced resin that is built up from the outer peripheral surface of the short pipe 31 to the outer peripheral surface of the tube body 2 (the tube side overlap allowance m and the short tube side overlap allowance n), the stronger A flange joint 3 is fixed to the tube body 2.

  Since the flange joint 3 is composed of an assembly of a plurality of divided bodies 3A and 3B, the overlap margin n on the short pipe 31 side is made larger so that the divided bodies 3A and 3B are fixed integrally as much as possible. It is preferable to do. Specifically, the overlap allowance n on the short tube 31 side is taken from the step G to the allowance width Y, so that at least a portion where the second engaging portion 314 exists in the short tube 31 is covered with the reinforcing material layer 5. It is preferable to do.

  Table 3 below shows details of the material of the reinforcing material layer 5 and molding means.

  As shown in FIG. 3, in the tubular structure 1 of the present invention, the flange portion 32 in the flange joint 3 fixed to the tubular body 2 is joined to the flange portion 32 </ b> P provided in the opening of another tubular body P. Thus, the pipe structure 10 of the present invention is obtained. The other tubular body P has a flange portion 32P that can be joined to the flange portion 32 in the tubular structure 1 of the present invention, and is particularly capable of constructing the conduit structure 10 together with the tubular structure 1 of the present invention. It is not limited. 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 constructed by joining the tubular structures 1 of the present invention.

  By the way, in this embodiment, as the tubular body 2, a cylindrical body, that is, a cylindrical body having a circular horizontal cross section cut by a horizontal plane perpendicular to the axis is used. Is not limited to this. As the tubular body 2, for example, a cylindrical body whose horizontal cross-sectional shape is an ellipse, a quadrangle, or a further polygonal shape may be used.

  In the present embodiment, the “filament winding method” is used as the forming means for the tube body 2, but the forming means for the tube body 2 is not limited to this. Other means for forming the tubular body 2 include, for example, a “centrifugal molding method” in which a resin and short glass fibers are put into a rotating cylindrical mold and molded by centrifugal force, or glass impregnated with a resin. Examples thereof include a “pultrusion molding method” in which fiber roving is heated and cured while being drawn through a die.

  Furthermore, as the pipe body 2, not only a glass fiber reinforced composite pipe but also a hard vinyl chloride single layer pipe (VP pipe (PVC thick wall pipe) or VU pipe (PVC thin wall pipe)), concrete pipe, or metal pipe It may be.

  In the present embodiment, the flange joint 3 is provided with an annular flange portion 32 having a circular outer edge shape on the outer peripheral surface of the cylindrical short pipe 31, but the flange joint has the same shape. It is not limited. As the short tube 31, for example, a cylindrical body whose horizontal cross-sectional shape is an ellipse, a quadrangle, or a further polygonal shape may be used. As the flange portion 32, for example, the outer edge shape may be an ellipse, a rectangle, or a further polygonal shape.

  In the present embodiment, the flange joint 3 is used in which the end face of the one open end 311 of the short pipe 31 is flush with the joint surface 321 of the flange portion 32. However, as the flange joint 3, the short pipe 31 is used. One opening end 311 protruding from the joint surface 321 of the flange portion 32 may be used. In connecting the tubular structure 1 of the present invention constructed using such a flange joint 3 to another tubular body P, as shown in FIG. 4, a short pipe projecting from the joint surface 321 of the flange portion 32 is used. The other open end 312 of 31 is inserted into another tube P.

  Further, in the present embodiment, the flange joint 3 is formed using the “RTM method”, but the forming means for the flange joint 3 is not limited to this. Other means for forming the flange joint 3 include, for example, a sheet in which a chopped strand is impregnated with a resin paste mixed with a resin, a curing agent, a thickener, an internal release agent, a filler, etc., and both surfaces are covered with a film. “SMC method” in which a shaped intermediate (SMC (Sheet Molding Compound)) is charged into a mold, heated under pressure and cured to form, or an intermediate (kneaded chopped strand and resin) "BMC method" which molds BMC (Bulk Molding Compound) by compression, transfer, injection molding, etc. Furthermore, a fiber base material is pre-shaped in a mold, and then the resin is impregnated with a brush or roller. And a “hand lay-up method” in which layers are laminated to a predetermined thickness while defoaming. The flange joint 3 is not limited to a fiber reinforced resin, but may be a plastic made of a resin such as hard vinyl chloride, a concrete, or a metal molded material.

  As a reference, an example of forming the flange joint 3 by the hand lay-up method is shown in Table 4 below.

  By the way, in this embodiment, while providing the annular groove part as the 1st engaging part 21 in the outer peripheral surface 22 of the pipe body 2, on the inner peripheral surface 313 of the short pipe 31 in the flange joint 3, the 2nd engaging part 314 is provided. As shown in FIG. 5, the annular convex portion as the first engaging portion 21 is provided on the outer peripheral surface 22 of the tubular body 2, while the short pipe 31 in the flange joint 3 is provided. An annular groove as the second engaging portion 314 may be provided on the inner peripheral surface 313. In short, each engagement portion may be provided so that the first engagement portion 21 and the second engagement portion 314 can be engaged with each other.

  As a means for providing an annular convex portion as the first engaging portion 21 on the outer peripheral surface 22 of the tubular body 2, for example, the annular convex portion 21 a is integrally formed when the tubular body 2 is molded, or the tubular body 2 is formed. An example is a method in which an annular convex portion is additionally formed after molding by a hand lay-up method or the like. On the other hand, as means for providing an annular groove portion as the second engaging portion 314 on the inner peripheral surface 313 of the short pipe 31 in the flange joint 3, the annular groove portion can be formed integrally when the flange joint 3 is formed, Examples of the means for forming an annular groove portion by forming a groove with a lathe after forming 3 can be given.

  The filler 4 may be formed not only from silicone rubber but also from other elastic bodies such as fluorine rubber and styrene-butadiene rubber. In addition, the filler 4 is made by injecting an adhesive or a pressure-sensitive adhesive into the slit portion 33 and curing it so that the adhesive layer or the pressure-sensitive adhesive layer is interposed in the slit portion 33, and the adhesive layer or the pressure-sensitive adhesive layer is used as the filler. It may be 4. In the case of using an adhesive, it is preferable to use an elastic adhesive that exhibits elasticity when cured.

  The fiber reinforced resin forming the reinforcing material layer 5 is not particularly limited as long as it is a composite material in which fibers such as carbon fibers and glass fibers are mixed in a resin as a base material (matrix). As the base material, a thermosetting resin such as unsaturated polyester or vinyl ester is generally used, but is not limited thereto, and other epoxy resins, polyamide resins, and phenol resins may be used. A thermoplastic resin such as methyl methacrylate may be used as a base material.

  In forming the reinforcing material layer 5, as shown in FIG. 6, the first recess 24 is provided in a portion where the fiber reinforced resin overlaps m on the tube body 2 side, or the fiber reinforced resin on the short tube 31 side is formed. If the fiber reinforced resin is built up after providing the second recessed portion 34 in the overlap n portion, the fiber reinforced resin is cured in a state where the first recessed portion 24 and the second recessed portion 34 are filled, and further. The flange joint 3 can be firmly fixed to the pipe body 2.

  The present invention can be implemented in various other forms without departing from the spirit or main features thereof. For this reason, the above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is indicated by the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  According to the present invention, it is possible to connect a pipe body to another pipe body by a simple operation, and it is very easy to connect a composite pipe or the like, which has conventionally been very complicated.

1 Tube structure of the present invention (tube structure with flange)
2 Tube 21 First engagement portion 22 Outer peripheral surface 23 Connection opening 24 First recess 3 Flange joint 31 Short tube 311 One opening end 312 Other opening end 313 Inner peripheral surface 314 Second engagement portion 32 Flange portion 321 Joining surface 322 Back surface 323 Through hole 33 Slit portion 34 Second recess 4 Filler 5 Reinforcement material layer 10 Pipe structure G Step m Tube side overlap allowance n Short tube side overlap allowance

Claims (4)

A flanged tubular structure in which a flange joint is fixed to a tubular body,
This flanged tube structure
Tube,
A flange joint provided with a flange on the outer peripheral surface of the short pipe,
The outer peripheral surface of the tubular body is provided with a convex or concave first engaging portion,
The flange joint is an assembly of a plurality of divided bodies divided by a plurality of slit portions that cut the short pipe together with the flange portion from one opening end to the other opening end of the short pipe, and on the inner peripheral surface of the short pipe Convex or concave second engagement portion is provided,
In a state where the first engagement portion and the second engagement portion are engaged with each other, a flange joint is sheathed on the tube body,
In addition, a reinforcing material layer is formed by embedding a fiber reinforced resin from the outer peripheral surface of the short tube to the outer peripheral surface of the tube while filling a step formed between the outer peripheral surface of the tube and the outer peripheral surface of the short tube. A flanged tubular structure characterized in that a flange joint is fixed to the tubular body. In the tube structure with a flange according to claim 1,
A flanged tubular structure in which an adhesive layer or an adhesive layer is interposed in a gap existing between the outer peripheral surface of the tubular body and the inner peripheral surface of the short tube. In the tubular structure with a flange according to claim 1 or 2,
A flanged tubular structure in which an adhesive layer, a pressure-sensitive adhesive layer, or a filler made of an elastic member is interposed in the slit portion.   A pipe line structure comprising a flange portion in the flanged tubular structure according to any one of claims 1 to 3 connected to a flange portion provided at an opening in another pipe body.

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