JP4870152B2 - Synthetic resin tube and manufacturing method thereof - Google Patents

Description

  The present invention relates to a synthetic resin pipe used for protecting these through a communication and energizing cable in a pipe or as a liquid transport pipe for water and sewage and a method for producing the same.

  Conventionally, synthetic resin pipes have been widely used as underground pipes that are buried in the ground. However, this type of synthetic resin pipes needs to have pressure resistance to withstand strong earth pressure.

  For example, the underground pipe 50 shown in FIG. 10 includes an inner pipe part 50a, a reinforcing rib part 50d wound spirally around the outer pipe part 50a, and having a peak part 50b and a valley part 50c. The outer pipe part 50e formed so as to communicate with the top part 50b of the reinforcing rib part 50d is integrated, and the inner and outer surfaces are smooth.

  Since this kind of underground pipe 50 has undergone a manufacturing process in which a strip-shaped synthetic resin is formed into a pipe while being sent out in a spiral shape, the strip-shaped reinforcing member 51 made of a thin metal plate is formed into a convex cross section during the manufacturing process. It can be embedded in the reinforcing rib portion 50d while being processed, whereby the pressure-resistant flattening strength can be improved (see, for example, Japanese Patent No. 3165882).

  However, since the synthetic resin tube 50 has the reinforcing material 51 made of a thin metal plate wound around the entire tube, the pressure resistance flatness is high, but the weight is heavy, and the reinforcing material 51 does not have flexibility. It is not flexible enough to cope with ground changes.

  In addition, in order to embed the reinforcing material 51 in the resin, it is necessary to perform a coating process on the surface of the reinforcing material 51 in order to improve the adhesiveness with the resin, and the manufacturing process of the synthetic resin pipe 50 is complicated. There is also a problem. Therefore, it becomes difficult to reduce the cost as the amount of the reinforcing material 51 used increases.

  The present invention has been made in consideration of the above-described problems in conventional synthetic resin pipes, and can be reduced in weight while maintaining the pressure resistance required for underground pipes, and has flexibility. A synthetic resin pipe excellent in earthquake resistance and a method for producing the same are provided.

  The synthetic resin pipe of the present invention includes an inner pipe part, a reinforcing rib part formed by spirally winding a ridge around the outer peripheral wall of the inner pipe part, and each top part of the reinforcing rib part as a tube axis. A synthetic resin tube having an outer tube portion covering the reinforcing rib portion so as to communicate with the direction, wherein (a) a metal lath, or (b) a glass strand or a glass yarn is meshed on the outer tube portion The gist is that a woven glass net is embedded.

  (a) According to the synthetic resin pipe in which the metal lath is embedded in the outer pipe portion, a hollow reinforcing structure is constituted by the inner pipe portion, the reinforcing rib portion, and the outer pipe portion in which the metal lath is embedded, and each portion cooperates. To withstand external pressure. In addition, since the metal lath has a mesh structure, the synthetic resin tube has both strength and flexibility.

  The metal lath is preferably formed to have a flat surface by pressing.

  Moreover, it is preferable to use a metal lath having a mesh having a major axis and a minor axis, and arranging the minor axis in the circumferential direction of the synthetic resin tube.

  Further, the method for producing a synthetic resin tube containing metal lath according to the present invention includes a step of forming an inner tube portion by winding a strip-like resin in a spiral shape, and a ridge that is joined to the inner tube portion is wound in a spiral shape. The step of forming the reinforcing rib portion by rotating is performed in an arbitrary order, and the first strip-shaped resin, the strip-shaped metal lath and the second strip-shaped resin are stacked on the top of the formed reinforcing rib portion. The gist is to form the outer tube by winding the body in a spiral.

  Further, another method for producing a synthetic resin tube containing metal lath according to the present invention includes a step of forming an inner tube portion by spirally winding a belt-shaped resin, and a spiral formed on the protrusion joined to the inner tube portion. The step of forming the reinforcing rib portion by winding it around is performed in an arbitrary order, the first strip-shaped resin is spirally wound around the top of the formed reinforcing rib portion, and the outer peripheral wall of the first strip-shaped resin A belt-shaped metal lath is wound around, and a second belt-shaped resin is spirally wound around the outside of the metal lath, and the outer tube portion is formed of the wound first belt-shaped resin, the metal lath, and the second belt-shaped resin. The gist is to form.

  (b) When a synthetic resin tube is constructed by embedding a glass net in the outer tube portion, the glass net can be embedded in the inner tube portion.

  In addition, the method for producing a synthetic resin tube with a glass net according to the present invention includes a step of forming an inner tube part by winding a strip-like resin in a spiral shape, and a spiral connected with the inner tube part. The step of forming the reinforcing rib portion by winding in a random order is performed in any order, the first belt-shaped resin, the glass strand or glass yarn woven into a mesh shape and cut into a strip shape, and the second strip shape The gist is to form a laminated body obtained by laminating and integrating a resin around the top of the reinforcing rib portion in a spiral manner to form an outer tube portion.

  Further, another method for producing a synthetic resin tube with a glass net according to the present invention includes a step of forming an inner tube portion by spirally winding a belt-shaped resin, and a protrusion joined to the inner tube portion. The step of forming the reinforcing rib portion by spirally winding is performed in an arbitrary order, and the first strip-shaped resin is spirally wound around the top of the formed reinforcing rib portion. A glass net or glass yarn woven in a mesh shape on the outer peripheral wall and wound into a strip is wound, and a second strip resin is spirally wound around the outside of the glass net. The gist is to form the outer tube portion with the strip-shaped resin, the glass net, and the second strip-shaped resin.

  In the present invention, polyethylene, polyvinyl chloride, polypropylene, unsaturated polyester and other synthetic resin materials can be used as the synthetic resin material constituting the synthetic resin tube containing metal lath or glass net.

  In addition, the cross-sectional shape of the reinforcing rib portion in the present invention is not particularly limited as long as it is formed on the ridge, and may be any of a rectangle, a square, a trapezoid, a triangle, a semicircle, and the like.

  According to the synthetic resin pipe and the manufacturing method thereof of the present invention, it is possible to reduce the weight while maintaining the pressure strength required as an underground pipe, and since it has flexibility, it is excellent in earthquake resistance. Have

  Moreover, since the metal lath or the glass net is embedded as the reinforcing material, the cost of the synthetic resin tube can be reduced as compared with the conventional synthetic resin tube embedded with the metal thin plate.

  In addition, a synthetic resin tube having a smooth outer surface and high pressure resistance can be provided by a metal lath or glass net embedded in the outer tube portion. In addition, since the tube portion can be formed smoothly, the seal becomes reliable when the synthetic resin tubes are connected to each other, and the water stop performance can be improved.

  In particular, according to the synthetic resin pipe with a glass net embedded as a reinforcing material, since it is an extremely lightweight material, when it is integrated with the pipe section, it provides strength that can resist tensile force in the pipe axis direction. It is possible to reduce the weight while securing sufficient pressure resistance as the buried pipe.

It is the side view which showed the structure of the synthetic resin pipe | tube with a metal lath concerning this invention in the partial cross section. It is the C section expanded sectional view of FIG. It is explanatory drawing which shows the shape of the metal lath embed | buried in strip | belt shape in the outer tube | pipe part of FIG. It is the enlarged view which showed the mesh dimension of the metal lath shown in FIG. It is explanatory drawing which shows the manufacturing method of the synthetic resin pipe containing a metal lath. It is explanatory drawing which shows the directionality of a metal lath. It is explanatory drawing which shows another manufacturing method of the synthetic resin pipe containing a metal lath. It is side surface sectional drawing which shows the structure of the synthetic resin pipe | tube with a glass net concerning this invention. It is explanatory drawing which shows the manufacturing method of a synthetic resin tube containing a glass net. It is side surface principal part sectional drawing which shows the structure of the conventional pressure | voltage resistant resin pipe.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  The synthetic resin pipe of the present invention has a first form reinforced with a metal lath and a second form reinforced with a glass net.

(a) Synthetic Resin Tube According to First Embodiment FIG. 1 shows a configuration of a synthetic resin tube containing a metal lath. The upper half of the center line CL is a sectional view, and the lower half is an external view. Show.

  The synthetic resin pipe 1 with a metal lath has an inner pipe part 2 with a smooth inner surface, and angular wave-shaped ridges are wound around the outer peripheral wall of the inner pipe part 2 at a predetermined pitch to form a reinforcing rib part 3. Yes.

  The reinforcing rib 3 has a shape in which crests 3a and troughs 3b are alternately continued in the tube axis direction, and 3c is a side wall between the crests 3a and troughs 3b.

  The outer peripheral side (flat top portion 3a ′) of the reinforcing rib portion 3 is covered with an outer tube portion 4, and this outer tube portion 4 is in a state where each apex portion 3a ′ of the reinforcing rib portion 3 is connected in the tube axis direction. Is provided.

  As the synthetic resin material for forming the inner tube portion 2, the outer tube portion 4 and the reinforcing rib portion 3, polyolefin synthetic resins such as polyethylene and polypropylene, polyester synthetic resins such as unsaturated polyester, vinyl chloride Synthetic resins are mainly used, but other synthetic resins or rubber-based resin materials such as rubber or synthetic rubber can also be used.

  In the figure, A is a hollow portion partitioned by the reinforcing rib portion 3 and the inner tube portion 2, and B is a hollow portion partitioned by the reinforcing rib portion 3 and the outer tube portion 4.

  FIG. 2 is an enlarged view of part C of FIG.

  As shown in FIG. 2, the synthetic resin tube 1 with metal lath has an inner tube portion 2, an outer tube portion 4, and a reinforcing rib portion 3, and a metal lath 5 is embedded in the outer tube portion 4.

  Specifically, the outer tube portion 4 is formed by laminating a first layer (first strip-shaped resin) 4a and a second layer (second strip-shaped resin) 4b wound around the first layer 4a. The metal lath 5 is sandwiched between the layers 4a and 4b.

  The metal lath 5 is manufactured by using a thin plate defined in, for example, JIS G3131 (hot rolled mild steel plate and steel strip) or JIS G3141 (cold rolled mild steel plate and steel strip), at room temperature and by a stretch cutting method. Can be used. In the stretch cutting method, for example, a flat lath can be obtained by forming slits at 0.5 mm intervals in a thin plate having a raw material thickness of 0.3 mm and pulling in the D direction (see FIG. 3). In addition, it is preferable to use the metal lath 5 which gave the antirust process.

  In addition, the commercially available metal lath has irregularities on the lath surface when pulled, and if it is embedded in the outer tube portion 4 in this state, the pattern of the irregularities will be reflected on the outer peripheral surface of the outer tube portion 4. Further, when a wire lath or a wire net is used in addition to the metal lath, the unevenness of the wire crossing portion is reflected on the outer peripheral surface of the outer tube portion 4.

  Therefore, in this embodiment, the surface of the metal lath 5 after being stretch-cut is pressed with a roller to forcibly flatten it.

  FIG. 4 is an enlarged view of the mesh portion of the metal lath 5 rolled into a flat shape.

  The mesh size is determined according to the diameter of the synthetic resin pipe to be manufactured. For example, in the 600 mm diameter synthetic resin pipe, the major axis R is 20 mm and the minor axis S is 10 mm.

  In a synthetic resin tube having a diameter of 400 mm and 450 mm, the major axis R is 14 mm and the minor axis S is 8 mm. In each of the above diameters, the thickness T of the rolled metal lath 5 is 0.2 mm, and the width W is 0.7 mm.

  The metal lath 5 rolled into a flat shape is cut into a strip shape and wound on a winding roll (described later). In addition, the width M (refer FIG. 3) at the time of cut | disconnecting in strip | belt shape shall be 2.5 meshes.

  FIG. 5 shows a method of manufacturing the synthetic resin pipe 1 with metal lath.

  In the figure, a semi-molten resin extruded from a molding die of an extruder (not shown) onto a ridge is wound around a molding shaft (not shown) via a molding roller that forms the resin into the ridge. The

  The forming shaft is a conventionally known one that is configured in a bowl shape by arranging a plurality of hollow shafts on the circumference when viewed from the tube axis direction and arranging them parallel to the tube axis direction. Are arranged in an inclined state with respect to the support shaft to which the rotational force is transmitted. Accordingly, when the semi-molten ridge resin is supplied to the molding shaft, the supplied ridge resin is wound around the hollow shaft of the molding shaft and spirally wound so that the reinforcing rib portion 3 is formed. It is formed.

  Molten resin is supplied from the inside of the molding machine to the reinforcing rib portion 3 formed in a coil shape, and the inner tube portion 2 is formed on the inner peripheral side of the reinforcing rib portion 3.

  In addition, the formation order of the inner pipe part 2 and the reinforcement rib part 3 may be reverse to the above.

  10 is a first forming die for extruding the first layer 4a of the outer tube portion 4, 11 is a second forming die for extruding the second layer 4b, and 12 is a take-up roll winding the band-shaped metal lath 5. is there.

  The first layer 4a extruded from the first molding die 10 in a strip shape and the second layer 4b extruded from the second molding die 11 are molded to a predetermined thickness by passing between a pair of molding rolls 13a and 13b. The metal lath 5 unwound from the winding roll 12 passes through the forming rolls 13a and 13b while being sandwiched between the first layer 4a and the second layer 4b.

  At this time, the resin on the joining surface of the first layer 4a and the second layer 4b is melted through the mesh of the metal lath 5 so that the first layer 4a and the second layer 4b are joined together to form the laminate 4c. Become.

  The laminated body 4c integrated in this manner is spirally wound so as to be bridged over the top 3a ′ (see FIG. 1) of the reinforcing rib portion 3, whereby the outer tube portion 4 is formed. .

  In general, the shrinkage that occurs as the resin cures during the production of a synthetic resin tube is small in the tube axis direction and large in the circumferential direction orthogonal to the tube axis direction.

  On the other hand, as shown in FIG. 6, the metal lath 5 has a characteristic that it easily expands and contracts in the minor axis direction F and hardly expands and contracts in the major axis direction G.

  The first embodiment of the present invention utilizes the characteristics of the metal lath 5, and the mesh in the major axis direction G is directed to the pipe axis direction of the synthetic resin tube, and the mesh in the minor axis direction F is oriented in the circumferential direction of the synthetic resin tube. It is buried in the outer pipe part 4 toward. As a result, even if the pipe contracts in the circumferential direction during the production of the synthetic resin pipe, the metal lath 5 can contract following the contract.

  Conventionally, with a pressure-resistant synthetic resin tube that has been reinforced by winding a plate reinforcement such as a thin metal plate or punching metal, the plate reinforcement itself does not have elasticity, so shrinkage due to resin hardening during molding In order to prevent this, peeling may occur at the boundary between the plate-shaped reinforcing material and the resin layer, and in order to prevent this, it is necessary to perform a coating process to enhance the adhesion to the surface of the plate-shaped reinforcing material was there.

  On the other hand, in the synthetic resin pipe 1 with metal lath according to the first embodiment, the first layer 4a and the second layer 4b are fused through the mesh of the metal lath 5, so that the reinforcing material and the resin layer are bonded. Can be integrated without any coating process.

  Furthermore, the conventional synthetic resin pipe containing a plate-like reinforcing material is poor in flexibility, and cannot be elastically deformed in response to external pressure when a large earth pressure is temporarily applied in the ground.

  On the other hand, in the synthetic resin pipe 1 with metal lath according to the present embodiment, since the metal lath 5 is flexible, it can be elastically deformed in response to the temporarily increased external pressure, and restored when the earth pressure returns to normal. Because it can, it is excellent in earthquake resistance.

  In addition, it is preferable to change the mesh size of a metal lath, raw material thickness, etc. according to the aperture of a synthetic resin pipe.

  Further, for example, when connecting a synthetic resin pipe 1 containing metal lath, if it is desired to reinforce only a specific portion of the pipe, for example, the connection side end, a metal lath having a small mesh is embedded separately only at the connection side end. You can also

  Further, in manufacturing the synthetic resin tube 1 with metal lath, as shown in FIG. 7, a step of forming the inner tube portion 2 by winding the belt-shaped resin in a spiral shape, and a protrusion joined to the inner tube portion 2. The step of forming the reinforcing rib portion 3 by winding the strip spirally is performed in an arbitrary order, and then the first belt-like resin 4a is spirally wound around the top of the formed reinforcing rib portion 3. The strip-shaped metal lath 5 is wound around the outer peripheral wall of the first strip-shaped resin 4a, the second strip-shaped resin 4b is spirally wound outside the metal lath 5, and the wound first strip-shaped resin 4a The outer tube portion 4 can also be formed by the metal lath 5 and the second belt-like resin 4b.

  Table 1 compares the performance of the synthetic resin tube containing the metal lath according to the first embodiment and the synthetic resin tube of the conventional example (without the metal lath).

  However, the metal lath used has a major axis R of 20.0 mm, a minor axis S of 9.0 mm, a metal lath thickness T after rolling of 0.2 mm, and a width W of 0.7 mm. It is sandwiched between the second layers 4b.

  As can be seen from Table 1, the synthetic resin pipe with metal lath and the synthetic resin pipe of the conventional example have substantially the same mass and outer diameter, but when comparing the compression flat load, the synthetic resin pipe of this embodiment It was confirmed that the strength increased about 1.5 times that of the conventional example.

(b) Synthetic Resin Tube According to Second Embodiment Next, a configuration of a synthetic resin tube using a glass net as a reinforcing material instead of the metal lath 5 will be described. In addition, since the synthetic resin pipe | tube to which a glass net is applied has the fundamentally same structure as FIG. 1, the same code | symbol is attached | subjected about the same component and the description is abbreviate | omitted.

  FIG. 8 is an enlarged view of a main part of a synthetic resin pipe in which a glass net is embedded.

  As shown in the figure, in the synthetic resin tube 20 according to the second embodiment, a glass net 21 is embedded in the outer tube portion 4.

  Specifically, the outer tube portion 4 is formed by laminating a first layer 4a disposed on the inner side and a second layer 4b wound around the outer side of the first layer 4a, and between the layers 4a and 4b. A glass net 21 is sandwiched between the two.

  The first layer 4a and the second layer 4b are formed by winding a strip-shaped resin in a spiral shape, and the glass net 21 is also formed by winding a strip-shaped glass net in a spiral shape.

  The glass net 21 is composed of strands (one linear material) made of glass fibers that are not twisted, or yarns (woven with twisted glass fiber filaments) woven in a mesh shape, for example, A glass net of ARG products manufactured by Nippon Electric Glass Co., Ltd. can be used.

  The glass net is often used mainly for the purpose of repairing mortar and concrete and suppressing cracks, but the synthetic resin pipe 20 according to the second embodiment uses a corrosion resistance in the glass net to drain the pipe. It is used as a reinforcing material.

  When the synthetic resin tube 20 is manufactured, for example, when the glass net 21 has a diameter of 600 mm, the glass net 21 unrolled from the roll is obtained by winding the glass net 21 unrolled into a roll having a width of 50 mm. And the second layer 4b.

  Moreover, the mesh size (length x width) of the glass net 21 can be used in the range of 5 x 5 to 10 x 10 mm.

  Table 2 compares the performance of the synthetic resin tube 20 with a glass net according to the second embodiment and the synthetic resin tube of the conventional example (without a glass net).

  However, the glass net used was a plain weave of warp 255Tex × 2 and weft 408Tex × 1, mesh size 6 × 6 mm, and the wefts arranged in the tube axis direction to form the first layer 4a and the second layer 4b. It is sandwiched between them.

  As can be seen from Table 2, the synthetic resin pipe according to the second embodiment and the synthetic resin pipe of the conventional example have substantially the same mass and outer diameter, but when comparing the compression flat load, The strength of the synthetic resin pipe according to the form was confirmed to be about 1.6 times that of the conventional example.

  FIG. 9 shows a method for manufacturing the synthetic resin tube 20 with glass net.

  In this figure, a semi-molten resin extruded from a molding die of an extruder (not shown) onto a ridge is wound around the above-described molding shaft through a molding roller that molds the resin into the ridge.

  Thereby, the protrusion is wound around the hollow shaft of the forming shaft and spirally wound to form the reinforcing rib portion 3.

  The molten resin is supplied from the inside of the molding machine to the reinforcing rib portion 3 formed in a spiral shape, and the inner pipe portion 2 is formed on the inner peripheral side of the reinforcing rib portion 3.

  In addition, the formation order of the inner pipe part 2 and the reinforcement rib part 3 may be reverse to the above.

  Reference numeral 10 denotes a first forming die for extruding the first layer 4 a of the outer tube portion 4, 11 denotes a second forming die for extruding the second layer 4 b, and 22 denotes a winding roll winding the glass net 21. .

  The first layer 4a extruded from the first molding die 10 in a strip shape and the second layer 4b extruded from the second molding die 11 are molded to a predetermined thickness by passing between a pair of molding rolls 13a and 13b. The glass net 21 unwound from the take-up roll 22 passes through the forming rolls 13a and 13b while being sandwiched between the first layer 4a and the second layer 4b.

  At this time, the resin on the joining surface of the first layer 4a and the second layer 4b is fused through the mesh of the glass net 21, whereby the first layer 4a and the second layer 4b are joined and integrated.

  The outer tube portion 4c integrated in this way is spirally wound so as to be bridged over the top portion 3a of the reinforcing rib portion 3, and the outer tube portion 4 is formed.

  According to the synthetic resin tube 20 with a glass net according to the second embodiment, since the first layer 4a and the second layer 4b are fused through the mesh of the glass net 21, the reinforcing material and the resin layer are conventionally used. The reinforcing material and the resin layer can be integrated without requiring any coating treatment for adhering them.

  Furthermore, conventional synthetic resin pipes with reinforcing members made of metal plates have poor flexibility and could not be elastically deformed in response to external pressure when large earth pressures temporarily act in the ground. However, in the synthetic resin tube with a glass net according to the second embodiment, as with the synthetic resin tube with a metal lath according to the first embodiment described above, there is flexibility, so that the tube diameter direction temporarily increased. With respect to the external pressure, it is allowed to be slightly elastically deformed, and when the earth pressure returns to normal, the synthetic resin tube 20 can be restored to a circular cross section. This can be said to be excellent in earthquake resistance.

Further, since the glass net 21 has a woven structure of continuous fibers, it is light and has sufficient strength to resist tensile in the tube axis direction. In addition, the mesh size of the glass net 21, its mass (g / m < ² >), etc. can be suitably set according to the aperture of the synthetic resin tube 20 manufactured.

  Moreover, the glass net 21 can be wound in a state of being partially wrapped in the tube axis direction.

  For example, when the pitch of the reinforcing rib portion 3 is 55 mm, a glass net 21 having a width of 50 mm is used, and 0 to 5 mm is used as a lapping margin when winding. Thereby, the glass net 21 is spanned between the reinforcing rib portions 3. Thereby, the outer surface of the outer tube portion 4 can be formed smoothly.

  Further, when connecting the synthetic resin pipes 20 having the above-described configuration, a sealing sheet for water stop is wound around the connection side end portion, and a joint component is attached to the outer surface of the packing sheet, but the glass net 21 is embedded. Since the outer surface of the outer pipe portion 4 is formed smoothly as described above, a spiral water supply is not generated between the packing sheet and the synthetic resin pipe 20, and the water stop performance can be improved.

  In the above embodiment, the glass net 21 is sandwiched and integrated between the first layer 4a and the second layer 4b, and then wound around the reinforcing rib portion 3. Performing the step of forming the inner tube portion 2 by winding the wire and the step of forming the reinforcing rib portion 3 by spirally winding the protrusion joined to the inner tube portion 2, in any order, The first strip-shaped resin 4a is spirally wound around the top of the formed reinforcing rib portion 3, and then the strip-shaped glass net 21 is wound around the outer peripheral wall of the first strip-shaped resin 4a. Further, the second belt-like resin 4b is spirally wound, and the outer tube portion 4 can be formed by the wound first belt-like resin 4a, the glass net 5, and the second belt-like resin 4b (see FIG. Common to another method for producing the synthetic resin 1 with metal lath shown in FIG. .

  Moreover, in the synthetic resin pipe | tube 20 with a glass net which concerns on the said 2nd form, although the structure which embeds the glass net 21 in the outer tube part 4 was demonstrated, the said glass net 21 can also be embed | buried also in the inner pipe part 2. it can. In this case, an inner tube in which the glass net 21 is embedded is manufactured in advance, the inner tube is inserted inside the molded reinforcing rib portion, and the inner tube and the reinforcing rib portion are joined with an adhesive or the like. Become.

  Thus, the synthetic resin tube 21 in which the glass net 21 is embedded in both the inner tube portion 2 and the outer tube portion 4 has an advantage that not only the inner and outer surfaces are smoothed but also the pressure resistance is increased.

  The synthetic resin pipe of the present invention can be applied as a protective pipe for communication and energizing cables, and as a transport pipe for the purpose of transporting liquids such as water and sewage, and the method for producing the synthetic resin pipe of the present invention Can be applied to the manufacturing method of these synthetic resin pipes.

Claims (8)

  The inner pipe part, a reinforcing rib part formed by spirally winding a ridge around the outer peripheral wall of the inner pipe part, and each top part of the reinforcing rib part are communicated in the pipe axis direction. A synthetic resin tube having an outer tube portion covering a reinforcing rib portion, and (a) a metal lath, or (b) a glass net woven from a glass strand or a yarn in a mesh shape is embedded in the outer tube portion. A synthetic resin tube characterized by having   The synthetic resin pipe according to claim 1, wherein the metal lath has a flat surface formed by pressing.   The synthetic resin pipe according to claim 1 or 2, wherein the metal lath has a mesh having a major axis and a minor axis, and the mesh in the minor axis direction is arranged toward the circumferential direction of the synthetic resin pipe.   Arbitrary order of forming the inner pipe part by spirally winding the belt-shaped resin and forming the reinforcing rib part by spirally winding the ridges joined to the inner pipe part The outer tube portion is formed by spirally winding a laminate formed by laminating the first belt-like resin, the belt-like metal lath and the second belt-like resin on each top portion of the formed reinforcing rib portion. A method for producing a synthetic resin pipe, characterized by comprising:   Arbitrary order of forming the inner pipe part by spirally winding the belt-shaped resin and forming the reinforcing rib part by spirally winding the ridges joined to the inner pipe part The first strip-shaped resin is spirally wound around each top portion of the formed reinforcing rib portion, the strip-shaped metal lath is wound around the outer peripheral wall of the first strip-shaped resin, and the second lath is wound outside the metal lath. A method for producing a synthetic resin tube, comprising: winding a strip-shaped resin in a spiral shape, and forming the outer tube portion by the wound first strip-shaped resin, the metal lath, and the second strip-shaped resin.   The synthetic resin tube according to claim 1, wherein the glass tube is embedded in the outer tube portion, and further, a glass net obtained by weaving glass strands or glass yarns in a mesh shape is embedded in the inner tube portion.   Arbitrary order of forming the inner pipe part by spirally winding the belt-shaped resin and forming the reinforcing rib part by spirally winding the ridges joined to the inner pipe part The first strip-shaped resin, glass strand or glass yarn woven into a mesh shape and cut into a strip shape, and the second strip-shaped resin are laminated and integrated on each top of the formed reinforcing rib portion. A method of manufacturing a synthetic resin tube, wherein the outer tube portion is formed by spirally winding the laminated body.   Arbitrary order of forming the inner pipe part by spirally winding the belt-shaped resin and forming the reinforcing rib part by spirally winding the ridges joined to the inner pipe part The first strip-shaped resin is spirally wound around the top of each of the formed reinforcing ribs, and a glass strand or glass yarn is woven into a mesh shape on the outer peripheral wall of the first strip-shaped resin and cut into a strip shape. The glass belt is wound, the second belt-shaped resin is spirally wound around the outside of the glass net, and the outer tube is formed by the wound first belt-shaped resin, the glass net, and the second belt-shaped resin. A method of manufacturing a synthetic resin tube, characterized in that a part is formed.

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