WO2012144052A1

WO2012144052A1 - Hollow synthetic resin cylinder

Info

Publication number: WO2012144052A1
Application number: PCT/JP2011/059854
Authority: WO
Inventors: 金尾　茂樹
Original assignee: カナフレックスコーポレーション株式会社
Priority date: 2011-04-21
Filing date: 2011-04-21
Publication date: 2012-10-26
Also published as: CN102859246B; CN102859246A

Abstract

Provided is a lightweight and low cost hollow synthetic resin cylinder. This hollow synthetic resin cylinder is characterized by comprising a foam molding which is formed in a hollow cylindrical shape, a hollow cylindrical wall which is wholly or partially embedded in the foam molding, and one or more hollow cylinder bodies disposed in the troughs of the cylinder wall and covered with the foam molding. The hollow cylinder bodies are each configured from at least one selected from among a resin pipe, a resin tube, and a resin hose.

Description

Synthetic resin pipe

The present invention relates to a synthetic resin pipe applied to a drain pipe under a road, a large drain pipe for sewers, and the like.

Conventionally, concrete fume pipes are generally used as drain pipes under roads or drain pipes for sewers.

In recent years, corrugated synthetic resin pipes that have strengths equal to or greater than those of fume pipes and are advantageous in terms of durability, light weight, and labor saving during construction have begun to be used.

As this type of corrugated synthetic resin pipe, specifically, a corrugated synthetic resin pipe is shown in which the main body has a cylindrical shape and a reinforcing convex portion is spirally wound around the outer wall of the main body.

When connecting such waved synthetic resin pipes, a water stop material is attached to the spiral groove of the connecting portion, a packing sheet is wound from above, and two halved joints (C-shaped cross section) with flanges are also installed. Cover the connection side end of the synthetic resin pipe in a cylindrical shape and tighten the flanges of each half joint with bolts and nuts.

However, such a connection method requires installation of a caulking material as a water stop material, a water stop block, a packing sheet, a pair of half joints, etc. in the field according to the connection procedure. In addition, the number of parts is large and the management is troublesome.

Furthermore, depending on the connection location, etc., the water-stopping material is very easy to peel off, and even if it is firmly bonded, water cannot be completely stopped.

On the other hand, as a synthetic resin tube that can perform the connection work more easily and quickly, a welding flange is welded to the connection side end of each corrugated synthetic resin tube, and a packing is provided on the surface where the connection flanges contact each other, A synthetic resin pipe for fastening connection flanges with bolts and nuts has been proposed (for example, see Patent Document 1).

According to such a synthetic resin pipe, workability can be significantly improved as compared with a conventional connection method using a half joint, and a more reliable connection can be obtained.

However, the connection flange needs to be connected with bolts and nuts, which causes a reduction in work efficiency in an environment where work space cannot be secured.

Also, if the connection flange is not securely welded to the synthetic resin pipe, it will cause water leakage, and if the connection flange surface is deformed, it will also cause water leakage. Carefully install the connection flange. There must be.

Also, high quality is required to ensure sufficient strength for the connection flange and prevent deformation. If the connection flange is strengthened and the bolts and nuts for connecting the flanges are included, the weight of the connection portion cannot be increased, and therefore there is a limit to cost reduction.

In addition, most of the synthetic resin pipes used for drainage pipes have an inner diameter of 1000 mm or more and are set to a long dimension of about 5 m. For example, they fall when loading / unloading trucks from the loading platform. Doing so has the problem of damaging the ends of the tubes.

JP 2002-139178 A

The present invention has been made in view of the above circumstances, and an object thereof is to provide a synthetic resin tube that can be reduced in weight and cost.

A synthetic resin pipe according to the present invention is disposed in a foam molded body formed into a cylindrical shape, a cylindrical pipe wall embedded entirely or partially in the foam molded body, and a valley portion of the tube wall. And having one or a plurality of pipe bodies that are provided and covered with the foamed molded body.

The tube body is preferably composed of at least one selected from a resin pipe, a resin tube, and a resin hose.

It is preferable that the pipe body is arranged so as to surround a region in the circumferential direction of the valley portion of the pipe wall.

The foamed molded body is preferably molded on both ends of the tube wall.

The synthetic resin pipe may be a joint composed of a foam molded body, a pipe wall, and a pipe body.

The foamed molded body may be formed on a part of the outer surface and the inner surface of the tube wall, and a foam sheet may be wound on the other part of the inner surface.

The tube wall may consist of a cylindrical main body part and a reinforcing convex part having a convex cross section that is spirally wound around the outer surface of the main body part with a certain interval.

According to the synthetic resin pipe according to the present invention, one or a plurality of pipe bodies are disposed in the valley portion of the pipe wall, and the pipe wall on which the pipe body is disposed is covered with the foamed molded body, thereby simply pipes. Compared with the case where the wall is covered with a foam molded article, the amount of the foam molded article can be reduced. Thereby, weight reduction and cost reduction of a synthetic resin pipe (including a joint) can be achieved. Furthermore, since said pipe body is hollow shape, the weight reduction and cost reduction of a synthetic resin pipe (a coupling is included) can be implement | achieved further.

Moreover, when using the same resin as the pipe wall (for example, polyethylene) as the above-mentioned pipe body, the resins are highly compatible with each other, and heat fusion (hot) can be performed without using an adhesive or the like. The tube can be easily fixed to the tube wall by the melt. Furthermore, the tube has an adhesive strength that can withstand the foaming pressure when the foamed molded body is injected, and does not peel from the tube wall. Even if a hot-melt adhesive is used, the same effect is produced.

On the other hand, when the resin different from the tube wall is used as the tube body (for example, polyethylene and vinyl chloride), the compatibility between the resins is relatively low. In this case, by using an adhesive, The tube body can be firmly fixed to the tube wall.

It is a general view which shows the connection state of the synthetic resin pipe | tube with a spiral wave with a joint which concerns on this invention. (A) is principal part sectional drawing which shows the pipe wall of a synthetic resin pipe | tube with a spiral wave, (b) is principal part sectional drawing which shows the modification of a pipe wall. It is an expanded sectional view of the connection part of FIG. It is principal part sectional drawing which shows the modification of a receiving part. It is a FIG. 1 equivalent view which shows 2nd Embodiment of the synthetic resin tube with a spiral wave with a joint which concerns on this invention. It is an expanded sectional view of the connection part of FIG. FIG. 6 is a view corresponding to FIG. 3 showing a third embodiment of a synthetic resin pipe with a spiral wave according to the present invention. FIG. 4 is a view corresponding to FIG. 3 showing a modification of the receiving port and the insertion port. FIG. 6 is a view corresponding to FIG. 3 showing a further modification of the receiving port and the insertion port. FIG. 6 is a view corresponding to FIG. 3 showing a fourth embodiment of the synthetic resin pipe with a spiral wave according to the present invention. FIG. 4 is a view corresponding to FIG. 3 showing a modification of the receiving port and the insertion port. It is a general view which shows 5th Embodiment of the synthetic resin pipe with a spiral wave with a joint which concerns on this invention. It is an expanded sectional view of the connection part of FIG. FIG. 4 is a view corresponding to FIG. 3 showing a modification of the receiving port and the insertion port. It is explanatory drawing which shows the manufacturing method of a synthetic resin pipe | tube with a spiral wave. FIG. 6 is a view corresponding to FIG. 3 and showing another example of the pipe material constituting the receiving port. It is a flowchart which shows the manufacture procedure of the synthetic resin tube with a spiral wave which concerns on this invention. (a) is explanatory drawing which shows the crack state of the synthetic resin pipe | tube with a spiral wave with a joint which is not provided with the FRP layer, (b) is a principal part enlarged view of Fig.18 (a). (a) is explanatory drawing which shows the state after the drop test of the synthetic resin pipe | tube with a spiral wave of this invention, (b) is a principal part enlarged view of Fig.19 (a).

Hereinafter, the synthetic resin tube of the present invention and its connection structure will be described in detail with reference to the drawings.

Incidentally, the applicant of the present application has previously filed as a related application Japanese Patent Application No. 2009-53266 (unpublished) characterized by reinforcement of the entire receiving section. In contrast, the present invention protects the outer surface of the receiving portion from damage regardless of whether the entire receiving portion is reinforced, and reduces the weight of the synthetic resin pipe (including joints such as the receiving portion and the opening portion).・ The purpose is to reduce costs.

FIG. 1 is an explanatory diagram showing a connection structure S of

synthetic resin pipes

1A and 1B with spiral waves according to the present invention. FIGS. 1 to 3 are a first embodiment of the present invention, and FIG. 4 is a modification of the first embodiment. Example, FIGS. 5 and 6 are the third embodiment, FIG. 7 is the fourth embodiment, FIG. 8 is the fifth embodiment, FIG. 9 is the sixth embodiment, FIG. 10 is the seventh embodiment, and FIG. FIG. 12 is an explanatory view showing a method for producing a synthetic resin pipe with a spiral wave, FIG. 13 (a) is an explanatory view showing a state after a drop test of the synthetic resin pipe with a spiral wave of the present invention, and (b). FIG. 19 is an enlarged view of a main part of FIG.

In the figure,

reference numerals

1A, 1B, and 1C denote synthetic resin tubes with spiral waves, 2 denotes a tube wall, 3 denotes an insertion port (differential port), and 4 denotes a receiving port.

As shown in FIGS. 1 and 2, the connection structure S of the synthetic resin pipe with spiral wave of the present invention comprises two

synthetic resin pipes

1A and 1B with spiral wave formed by forming the pipe wall 2 into a spiral wave shape. The ends are connected to each other.

In the present embodiment, the synthetic resin tubes with

spiral waves

1A and 1B are each provided with an insertion port 3 at one end portion 10 (left end portion in the drawing) and a receiving port at the other end portion 11 (right end portion in the drawing). However, the connection structure of the present invention is not limited to such a tube connection structure having both ends, and the insertion port 3 is provided at least at the facing ends of both tubes. And the end 4 on the opposite side of each pipe may not be provided with the opening or the insertion opening.

First, the first embodiment will be described with reference to FIGS.

1. First Embodiment The tube walls 2 of the

synthetic resin tubes

1A and 1B with spiral waves are formed in a spiral wave shape, and at one end portion 10 (the left end portion in the drawing) of each tube as shown in FIG. The cylindrical insertion port 3 is formed by applying a synthetic resin layer as a foamed molded body that fills at least the recess (valley) 2a forming the wave shape on the outer surface side of the one end 10. The end portion 11 (the right end portion in the figure) has a receiving portion 4 made of a synthetic resin that is attached to the outer surface of the other end portion 11 and extends in a cylindrical shape outward in the axial direction (right direction in the figure). Is formed.

In the present embodiment, the synthetic resin layer 8 is applied in a state where the tube material 7 constituting the receiving portion 4 is partially exposed, and is particularly integrated with the distal end side and the tube wall 2 where strength is required. In this respect, the base end side which is important is buried in the synthetic resin layer 8, and the other intermediate part is exposed. If the tube material 7 is exposed in this manner, weight reduction and material cost reduction can be realized, and when the tube material 7 has the same external structure as the tube wall 2 as in the present embodiment, the receiving portion 4 is concerned. The exposed portion has the same appearance as that of the tube wall 2, the unity of the joint portion and the entire tube is increased in appearance, and the appearance is improved.

As shown in FIG. 2A, the pipe wall 2 of each pipe has a substantially triangular or substantially arc-shaped or trapezoidal crest and trough continuously forming a wave, and a trough between the crests. The part to include becomes the recess 2a.

In the present embodiment, a substantially triangular shape made of a resin molded body (for example, a coated steel plate) in which a steel material (steel plate having a convex cross section) 22 is provided on the outer peripheral side of a main body portion 20 as a synthetic resin tube wall having a substantially flat inner surface. The reinforcing convex part 21 having a shape or a substantially arc shape is provided in a spiral shape, and the reinforcing convex part 21 forming a mountain part with the main body part 20 is formed by melting and extruding a partially molded body of the main body part 20 on a rotating shaft. At the same time, the reinforcing projections 21 can be similarly spirally fed and integrated on the partial molded body, and can be efficiently produced.

In addition, you may comprise the reinforcement convex part 21 which has comprised the mountain part only from the resin layer, without decorating the steel material 22. FIG. Moreover, the shape of a peak part and a trough part is not specifically limited, You may comprise in a substantially V shape, a substantially U shape, a substantially circular shape, a substantially elliptical shape, a substantially square shape, a polygonal shape, an irregular shape, and other shapes.

Furthermore, in this embodiment, there is a main body 20 extending from the valley on the inner peripheral side of the mountain, and the main body 20 is configured so that the inner surface of the tube has a flat shape. 20 may be omitted, and the reinforcing convex portions 21 may be connected to each other, and the inner surface side may also be a spiral corrugated surface.

Further, as shown in FIG. 2 (b), a structure in which a concave portion 23 is provided at the peak is also a preferred embodiment. By providing such a recessed portion 23, pressure (earth pressure, etc.) applied to the ridge is dispersed, and the strength and rigidity of the ridge can be increased, and the pressure resistance of the entire tube wall 2 can be increased. . The presence of the recess 23 is a cause of fluid leakage in the conventional pipe connection structure. However, if the connection structure of the present invention is employed, the pipe having such a recess 23 exists. Can be connected without causing any leakage. In the example of FIG. 2B, an outer surface layer 24 is further applied along the outer surface of the substantially M-shaped reinforcing convex portion 21 made of a coated steel plate.

Synthetic resin materials used for the crests and troughs of these pipe walls 2, specifically, the main body part 20, the reinforcing convex part 21, and the outer surface layer 24, are synthetic materials such as polyolefins such as polyethylene and polypropylene, and vinyl chlorides. Resins and the like can be widely used, and other synthetic rubbers and soft resins can also be used.

As shown in FIG. 3, the insertion opening 3 formed in the one end 10 of each of the

synthetic resin tubes

1A and 1B with spiral waves fills at least the concave portion 2a forming the wave shape on the outer surface side of the one end 10. A synthetic resin layer 5 is applied to form a cylindrical shape whose outer surface is substantially flat along the axial direction, and can be in close contact with the inner peripheral surface of the receiving port 4 described later. In this embodiment, the synthetic resin layer 5 is formed by surrounding the one end portion 10 with a mold and injecting and curing the synthetic resin material. However, the present invention is not limited to this, and the synthetic resin layer 5 is separately molded. It is possible to attach the resin layer 5 to the end portion 10 and integrate them by heat fusion or the like, or to apply the synthetic resin layer 5 by other methods.

Further, the one end portion 10 is pressure-deformed in the direction of diameter reduction to reduce the diameter by crushing the reinforcing convex portion 21 so that the concave portion 2a having a predetermined depth remains, and the synthetic resin layer 5 is deposited thereon. Thus, it is possible to configure the insertion port 3 to have a diameter smaller than that of the tube wall 2. According to this, the size of the receiving port part 4 comprised in the other end part 11 becomes smaller, and the size of the whole connection part which consists of the insertion port part 3 and the receiving port part 4 can also be made smaller.

The synthetic resin material constituting the synthetic resin layer 5 may be either non-foamed or foamed, and olefinic resins such as polyethylene resin and polypropylene resin and other synthetic resins can be used. For example, polystyrene foam, polyethylene foam, rigid polyurethane foam, flexible polyurethane foam, rigid vinyl chloride foam, urea foam, phenol foam, acrylic foam, cellulose acetate foam, and other resins can be used.

In this embodiment, the crests of the synthetic resin layer 5 are partially exposed to such an extent that the crests of the end portions 10 can maintain a substantially flat surface, but may be attached so that the crests are completely hidden. Alternatively, the synthetic resin layer 5 may be thickly applied so that the outer surface is further outward than the summit.

As shown in FIG. 3, the receiving portion 4 is provided with a pipe material 7 having a diameter larger than that of the synthetic resin pipe 1 B with the spiral wave with respect to the other end portion 11 on the outer peripheral side of the other end portion 11. 7 is partly exposed to such an extent that a substantially flat surface can be maintained, and a synthetic resin layer as a foam molded body is also formed in the gap between the tube material 7 and the synthetic resin pipe with spiral wave 1B. 8, the inner peripheral surface of the cylindrical portion protruding outward in the axial direction is substantially flat along the axial direction, and functions as a receiving surface 40 into which the insertion port 3 is inserted. To do.

Similarly to the insertion port 3, the receiving port 4 is also formed by surrounding the other end 11 and the tube material 7 with a mold and injecting and curing a synthetic resin material. It is also possible to separately form the synthetic resin layer 8 containing, and attach the synthetic resin layer 8 to the end portion 11 and integrate them by heat fusion or the like, or attach the synthetic resin layer 8 by other methods. Further, the synthetic resin material similar to that of the insertion port 3 can be used for the material of the synthetic resin layer 8.

The tube material 7 is a tube portion in which a substantially triangular shape, a substantially arc shape, or a trapezoidal crest and trough are continuously waved like the

synthetic resin tubes

1A and 1B with spiral waves. The strength is considerably increased by the presence of the pipe material 7.

Then, one or a plurality of tube bodies 110 are provided in a part of the region covered with the foamed molded body.

Specifically, one or a plurality of pipes 110 are provided in the recess 2a covered with the synthetic resin layer 8 among the recesses 2a of the main body part 20 of the synthetic resin tube 1B with spiral wave, and the main body part 20 of the receiving part 4 is provided. One or a plurality of tube bodies 110 are provided in the recess 2 a covered with the synthetic resin layer 8 in the

recess

2 a, and 1 in the recess 2 a covered with the synthetic resin layer 5 among the recesses 2 a of the main body 20 of the insertion port 3. Alternatively, a plurality of tube bodies 110 are provided. In the present embodiment, the pipe body 110 is arranged so as to surround the region in the circumferential direction of the concave portion 2 a of the main body portion 20. In addition, since it is the same as that of the said FIG. 6 fundamentally about another structure, the same code | symbol is attached | subjected to the same member and the description is abbreviate | omitted.

In the present embodiment, a resin pipe is used as the tube body 110, but is not limited to the resin pipe. For example, a resin tube or a resin hose may be used as long as it is made of resin and has a hollow shape other than the resin pipe. May be adopted. In addition, for example, it is also possible to employ a tubular sheet of resin sheets.

Examples of the material of the resin pipe include phenol resin, nylon 66, nylon 6, PEEK, etc. having high tensile strength and compressive strength, and polycarbonate having high impact resistance and wear resistance, and high impact resistance. Examples include polypropylene and high impact polyethylene. In addition, it is desirable to select the material of these resin pipes according to the corrugated

synthetic resin pipes

1A and 1B.

When using the same resin as the main body 20 and the recess 2a as the tube body 110 (for example, polyethylene), the resins are highly compatible with each other, and even if an adhesive or the like is not used, heat fusion ( The pipe body can be easily fixed to the pipe wall by hot melt.

In the above embodiment, the resin pipe as the pipe body 110 is disposed in the recess 2a. However, the resin pipe, the resin tube, and the resin hose may be disposed in combination. For example, a resin pipe and a resin tube can be disposed in one recess 2a, and each of a resin pipe, a resin tube, and a resin hose can be disposed in one recess 2a. Even in this case, the synthetic resin pipe can be reduced in weight and cost.

In the above embodiment, the tubular body 110 is disposed so as to surround the region in the circumferential direction of the concave portion 2a. However, the present invention is not limited to this, and the length is relatively short with respect to the entire circumferential length of the concave portion 2a. It is also possible to arrange the plurality of tubular bodies 110 at intervals in the circumferential region.

In this embodiment, a pipe portion that forms a wave having the same structure as that of the

synthetic resin pipes

1A and 1B with spiral waves is used. However, the present invention is not limited to this, and the spiral provided with the pipe wall 2 shown in FIG. For the corrugated synthetic resin pipe 1B, as shown in FIG. 2 (b), a tube material 7 having a cross-sectional shape having a recess 23 at the peak is used, or conversely, the pipe wall 2 shown in FIG. 2 (b) is provided. For the synthetic resin tube 1B with a spiral wave, as shown in FIG. 2A, it is possible to use a tube material 7 that does not have a concave portion at the peak.

These pipe materials 7 (7A) are mainly used for maintaining the strength of the cylindrical portion protruding outward in the receiving port 4 and receiving the insertion port 3. However, the dimensions and materials can maintain the strength. It is also possible to omit the insert member such as the tube material 7 and configure the receiving portion 4 with only the synthetic resin layer 8. The tube material 7 (7A) and the outer peripheral surface of the tube wall 2 are firmly integrated by the synthetic resin layer 8 interposed therebetween.

The synthetic resin layer 8 constituting the receiving portion 4 may be reinforced by embedding reinforcing materials such as reinforcing fibers and nets as necessary.

Specifically, as shown in FIG. 3, when the outer peripheral surface of the connection side end of the receiving port 4 is reinforced, an FRP layer 8a can be provided on the outer peripheral surface.

The FRP layer 8a is formed by impregnating a reinforcing fiber with a synthetic resin material. As the reinforcing fiber, a chopped strand mat as a glass fiber base material for FRP formed in a tape shape or a sheet shape, A preferred range of weight per unit area of 100 to 300 g / m ² can be used. Further, a plain woven glass cloth or glass cloth tape for FRP, a preferable density range, 16 to 25 in length, and 15 to 23 in width / 25 mm can also be used. In addition, the said tape shape means what was cut into tape shape previously.

When the synthetic resin layer 8 is formed by injecting a foamed synthetic resin, the reinforcing fiber is impregnated with the synthetic resin in the foaming process of the foamed synthetic resin in the mold and cured to form the FRP layer 8a. Is done.

Further, when the synthetic resin layer 8 is formed of a non-foamed synthetic resin, the synthetic resin layer 8 including the tube material 7 is separately formed, and is attached to the end portion 11 and integrated by heat fusion or the like. The FRP layer 8a can also be formed by adhering a compression-molded FRP sheet obtained by impregnating a synthetic fiber into a reinforcing fiber in advance with an adhesive or the like on the outer peripheral surface of the receiving port formed as described above.

In addition, this FRP layer 8a can form the length to the whole circumferential direction, and the intensity | strength of a joint itself improves with the tensile strength and tensile elasticity modulus which a reinforcement fiber has.

In this case, a plurality of FRP sheets can be stacked to form the FRP layer 8a.

In this way, when the outer peripheral surface of the connection side end of the receiving port 4 is reinforced with the FRP layer 8a, a large-sized pipe having an inner diameter of 1000 mm or more and a length of about 5 m is used as a truck bed. When the pipe is lowered by a forklift, the pipe end can be protected from damage even if the synthetic resin pipe with a spiral wave is dropped.

Further, the FRP layer 8 a that can reinforce the outer peripheral surface of the connection side end of the receiving port 4 can also be applied to the insertion port 3.

Specifically, the FRP layer 5a having the same configuration as the FRP layer 8a can be formed on the outer peripheral surface of the connection side end portion of the insertion port portion 3, and the outer periphery of the connection side end portion of the insertion port portion 3 in this way. When the surface is reinforced with the FRP layer 5a, the insertion port 3 can be protected from damage as well as the receiving port 4.

In the synthetic resin pipe with a spiral wave, the configuration is different between the receiving port 4 and the insertion port 3, and the receiving port 4 is heavier than the insertion port 3. There is a high possibility of falling from the part 4 side first. Therefore, the FRP layer 8a must be formed on the connection-side outer peripheral surface of the receiving port 4 and the FRP layer 5a formed on the insertion port 3 may have an arbitrary configuration.

In addition, in this embodiment, although the insertion port part 3 and the receiving port part 4 were each comprised in the substantially flat shape along the axial direction, this invention is not limited to such a straight shape at all, The insertion port part 3 Is formed in a taper shape that tapers toward the opening end, and the inner peripheral surface of the receiving port portion 4 is formed in a taper shape having substantially the same angle substantially parallel to the same, or the outer diameter or receiving port of the insertion port portion. You may make it the shape which changes so that the internal diameter of an opening | mouth part may draw a curve along an axial direction.

Also, an O-ring 6 is interposed between the insertion port 3 and the receiving port 4 as a seal member. Specifically, an annular groove 50 into which the O-ring 6 is fitted is formed on the outer surface of the insertion opening 3, and the pipes are connected with the O-ring 6 fitted into the annular groove 50.

In the present embodiment, the annular groove 50 in which the O-ring 6 is mounted is formed by cutting out at the distal end edge of the insertion slot 3, but at the base edge or the middle part on the opposite side of the insertion slot 3. It may be formed. Moreover, you may provide in the receptacle part 4 side. The shape and structure of the sealing member such as the O-ring 6 is not particularly limited as long as the space between the insertion port 3 and the receiving port 4 can be reliably sealed, and various shapes and structures of sealing members are mounted at appropriate positions. Can be done. Further, instead of mounting the O-ring 6 separately, it is also possible to integrally form an annular projection serving as a seal portion in advance.

2. Modified Example of First Embodiment Next, a modified example of the first embodiment of the present invention will be described based on FIG.

In this embodiment, in addition to the first embodiment shown in FIGS. 1 to 3, the synthetic resin layer 8 as a foam molded body is formed on a part of the outer surface and the inner surface of the main body 20 and a foam sheet is formed on the other part of the inner surface. Even in the case where 111 is used, the weight of the receiving portion 4 and the synthetic resin layer 8 can be reduced and the cost can be reduced. In addition, the above structures using the foam sheet 111 are not limited to the receiving part 4, and can be applied to the insertion part 3 and the

synthetic resin pipes

1A, 1B, and 1C with spiral waves.

The foamed sheet 111 may be a non-foamed sheet. The lighter the specific gravity, the more the synthetic resin pipe (including the joint) can be reduced in weight and cost.

In addition, when the foamed sheet 111 and the synthetic resin layer 8 use the same resin (for example, polyethylene), the resins are highly compatible with each other. The tube body can be easily fixed to the tube wall by fusion (hot melt). Since other configurations and modifications are basically the same as those in the first embodiment, the same reference numerals are given to the same structures, and descriptions thereof are omitted.

3. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.

In the present embodiment, the synthetic resin layer 8 is deposited in a state where the pipe material 7 constituting the receiving port 4 is completely embedded, and the synthetic resin layer 8 is compared with the first embodiment. By embedding in the longitudinal direction of the mouth part 4, the strength of the joint itself is improved.

And in the case of the present embodiment, since the tubular body 110 is buried over the entire longitudinal direction of the receiving portion 4, the amount of the synthetic resin layer 8 used can be greatly reduced.

In the figure, reference numeral 8a denotes an FRP layer formed to reinforce the outer peripheral surface of the connection side end of the receiving port 4.

4). Third Embodiment Next, a third embodiment will be described based on FIG. 7, FIG. 8, and FIG.

In this embodiment, instead of the tube material 7 constituting the receiving portion 4, the synthetic resin portion (synthetic resin layer 8) of the receiving portion 4 contains the reinforcing fiber 7B. In this embodiment, The reinforcing fibers 7B are embedded in the form of a woven fabric, a nonwoven fabric, or a molded body solidified with a resin. Thereby, compared with what embeds the pipe material 7, the intensity | strength improvement of the same grade is aimed at, aiming at a significant weight reduction and cost reduction. In the present embodiment, the concave portion 23 shown in FIG. 2B is provided at the peak of the reinforcing convex portion 21 of each tube. However, as in the first embodiment, various corrugated synthetic resin tubes are used. Of course, it is applicable to.

As the reinforcing fiber, it is preferable to use glass fiber or glass fiber. When the receiving portion 4 is molded with a synthetic resin, a woven fabric, a nonwoven fabric or a resin molded body of the reinforcing fiber 7B is set in a molding die in advance. Can be embedded and molded. As another method, the molding of the receiving portion 4 is divided into two moldings of the inner portion and the outer portion, and the woven fabric of the reinforcing fiber 7B is formed on the outer surface when the molding of the first inner portion is finished. It is also possible to perform embedding molding by depositing a non-woven fabric or a resin molded body and performing a second molding thereon.

The woven fabric, non-woven fabric, or resin molded body of the reinforcing fiber 7B may be provided so as to exist almost entirely around the inside of the receiving portion 4, or may be provided with a single or a plurality so as to exist only partially. May be. What is necessary is just to interior what was shape | molded in the sheet form or the cylinder shape as a resin molding, and using the same resin as the synthetic resin layer 8 which comprises the opening part 4 as resin used for a resin molding point is an adhesive point. Is preferable. In addition, you may comprise so that the woven fabric of the reinforcement fiber 7B, a nonwoven fabric, or the resin molding may be affixed on the outer surface of the receiving part 4. FIG.

FIG. 8 shows an example in which the reinforcing fiber 7B is contained in the synthetic resin layer 5 of the insertion port 3 as well as the receiving port 4, and similarly, a woven fabric, a nonwoven fabric or a resin molded body of the reinforcing fiber 7B is shown. Embedded molding can be performed by previously setting in a mold and molding. The insertion port 3 contains the reinforcing fiber 7B as in the present embodiment, and the receiving port 4 is provided with the tube material 7 of the first embodiment in place of the reinforcing fiber 7B, or any reinforcing member. Of course, it is also possible not to insert.

In the figure, 8a is an FRP layer formed to reinforce the outer peripheral surface of the connection side end of the receptacle 4.

Further, as shown in FIG. 9, an engagement protrusion 70 is provided on the inner peripheral surface of the straight tube portion to engage with the peak portion of the tube wall 2. It is possible to increase the strength.

5. Fourth Embodiment Next, a fourth embodiment will be described based on FIGS. 10 and 11.

In this embodiment, an example in which the woven fabric, nonwoven fabric, or resin molded body of the reinforcing fiber 7B is provided in the receiving port 4 and the insertion port 3 has been described. However, as shown in FIG. It is preferable that the synthetic resin part is included in the entire synthetic resin part by mixing with the synthetic resin material for forming the insertion port 3 and the receiving port 4 to improve the overall strength. As shown in FIG. 11, it is also a preferable example to further increase the strength in combination with the woven fabric, nonwoven fabric or resin molded body of the reinforcing fiber 7B described above. Other configurations and modifications (such as the position of the O-ring) are basically the same as those in the first embodiment, and thus the same reference numerals are given to the same structures, and descriptions thereof are omitted.

10 and 11, reference numeral 8a denotes an FRP layer formed to reinforce the outer peripheral surface of the connection side end of the receiving port 4.

6). Fifth Embodiment Next, a fifth embodiment will be described based on FIGS.

As shown in FIGS. 12 and 13, the synthetic resin tube with spiral wave 1 C according to the present embodiment is configured by forming the tube wall 2 in a spiral wave shape, and at least one end of the one end portion (left end portion in the figure). A cylindrical insertion port 3 is provided by attaching a synthetic resin layer 5 filling a concave portion forming a wave shape on the outer surface side, and the other end portion is provided at the other end portion 102a (right end portion in the figure). In the case of providing the receiving portion 4 made of the synthetic resin layer 8 that is attached to the outer surface side and extends in a cylindrical shape on the outer side in the axial direction, a plurality of synthetic resin pipes 1C with spiral waves are connected to each other. The insertion port 3 of the synthetic resin tube 1C with spiral wave (middle right) is inserted into the receiving port 4 of the second synthetic resin tube with spiral wave (left side in the figure) and connected to each other. is there.

In the present invention, in particular, as shown in the longitudinal sectional view of FIG. 14, the receiving portion 4 is formed by coaxially connecting the pipe material 7 having a diameter larger than that of the synthetic resin tube with spiral wave 1C on the outer surface side of the other end portion 102a. The synthetic resin material of the synthetic resin layer 8 is filled in at least a gap between the pipe material 7 and the synthetic resin pipe with spiral wave 1C.

As shown in FIG. 14, the tube wall 2 has a substantially triangular shape, a substantially arc shape, or a trapezoidal peak portion and a trough portion continuously forming a wave, and a portion including the valley portion between the peak portions is a concave portion. Become. In this embodiment, a substantially triangular or substantially arc-shaped reinforcing convex portion 21 made of a resin molded body (for example, a coated steel plate) in which a steel material 22 is housed is provided on the outer peripheral side of a synthetic resin main body portion 20 having a substantially flat inner surface. It is provided in a spiral shape.

The reinforcing convex portion 21 may be formed only of the resin layer without interior of the steel material 22. Moreover, the shape of a peak part and a trough part is not specifically limited, You may comprise in a substantially V shape, a substantially U shape, a substantially circular shape, a substantially elliptical shape, a substantially square shape, a polygonal shape, an irregular shape, and other shapes. Furthermore, in this embodiment, there is a main body 20 extending from the valley on the inner peripheral side of the mountain, and the main body 20 is configured so that the inner surface of the tube has a flat shape. 20 may be omitted, and the reinforcing convex portions 21 may be connected to each other, and the inner surface side may also be a spiral corrugated surface.

The steel material 22 is also a preferred embodiment in which a concave portion 23 is provided at the top of the mountain in more detail. By providing such a recessed portion 23, pressure (earth pressure, etc.) applied to the ridge is dispersed, and the strength and rigidity of the ridge can be increased, and the pressure resistance of the entire tube wall 2 can be increased. . In this embodiment, an outer surface layer 24 is further applied along the outer surface of the steel material 22. As the synthetic resin material used for the crests and troughs of these pipe walls 2, specifically, the main body part 20 and the outer surface layer 24, polyolefin resins such as polyethylene and polypropylene, and synthetic resins such as vinyl chloride are widely used. Other synthetic rubbers and soft resins can also be used.

As shown in FIGS. 13 and 14, the insertion opening 3 on one end side of the synthetic resin tube with a spiral wave has the synthetic resin layer 5 so as to fill at least the concave portion forming the wave shape on the outer surface side of the one end portion. The outer surface is formed into a substantially flat cylindrical shape along the axial direction, and is in close contact with the inner peripheral surface of the receiving portion 4 at the other end. In this embodiment, the synthetic resin layer 5 constituting the insertion port 3 is formed by surrounding the one end portion with a molding die and injecting and curing a synthetic resin material. It is also possible to deposit layer 5. The synthetic resin material constituting the synthetic resin layer 5 may be either non-foamed or foamed, and olefinic resins such as polyethylene resin and polypropylene resin and other synthetic resins can be used. For example, polystyrene foam, polyethylene foam, rigid polyurethane foam, flexible polyurethane foam, rigid vinyl chloride foam, urea foam, phenol foam, acrylic foam, cellulose acetate foam, and other resins can be used.

As shown in the longitudinal sectional view of FIG. 14, the receiving end 4 on the other end side is formed by coaxially connecting a pipe material 7 having a diameter larger than that of the synthetic resin pipe with spiral wave 1C from the outer surface side of the other end 102a. A cylindrical shape that protrudes outward in the axial direction, in which a synthetic resin material of the synthetic resin layer 8 is filled in at least a gap between the pipe material 7 and the synthetic resin tube with spiral wave 1C. The inner peripheral surface of the portion is substantially flat along the axial direction, and functions as a receiving surface 40 into which the insertion port 3 is inserted. The synthetic resin layer material similar to that of the insertion port 3 can also be used for the synthetic resin layer 8 of the receiving port 4.

In the present embodiment, the insertion opening 3 and the receiving opening 4 are each formed in a substantially flat shape along the axial direction. However, the present invention is not limited to such a straight shape, and the insertion opening 3 is opened. The taper is tapered toward the end, and the inner peripheral surface of the receiving port 4 is configured to have a taper shape of substantially the same angle substantially parallel to the tapered portion, or the outer diameter of the insertion port or the receiving port. The inner diameter may be changed so as to draw a curve along the axial direction.

In addition, it is also preferable to configure the receiving surface 40 of the receiving port 4 in a reverse taper shape that is reduced in diameter from the inner side toward the outer opening, thereby achieving water tightness and tightness of the O-ring 6 of the insertion port 3. . Further, a stepped taper portion 42 is provided at the opening of the receiving portion 4 so that the O-ring 6 is caught by the opening when the insertion portion 3 is inserted and is not dropped off.

As with the synthetic resin pipe with spiral wave 1C, the pipe material 7 housed in the receiving part 4 is a pipe part in which a substantially triangular shape, a substantially arc shape, or a trapezoidal peak and trough continuously wave. Thus, the strength of the receiving port 4 is considerably increased by the presence of the pipe material 7. In this embodiment, the pipe wall 71 is formed in a spiral wave shape, and a pipe material (however, there is no main body part 20 on the inner peripheral side) that forms a wave having the same structure as the synthetic resin pipe with spiral wave 1C is used. Although the same reference numerals are attached and details are omitted, the present invention is not limited to the pipe material having such a configuration.

As a modified example of the pipe material 7, as shown in FIG. 16, a structure in which a main body portion 20a is provided on the inner peripheral side is also a preferable example. The tube material 7 and the outer peripheral surface of the tube wall 2 are firmly integrated by the synthetic resin layer 8 interposed therebetween.

The tube material 7 is covered with a synthetic resin layer 8 in a partially exposed state. In particular, the proximal end side, which is important in terms of integration with the distal end side where the strength is required, and the tube wall 2 is buried with the synthetic resin layer 8, and other intermediate portions are exposed. If the tube material 7 is exposed in this manner, weight reduction and material cost reduction can be realized, and when the tube material 7 has the same external structure as the tube wall 2 as in the present embodiment, the receiving portion 4 is concerned. The exposed portion has the same appearance as that of the tube wall 2, the unity of the joint portion and the entire tube is increased in appearance, and the appearance is improved.

As shown in FIG. 14, an O-ring 6 is interposed between the insertion port 3 and the receiving port 4 as a seal member. Specifically, an annular groove 50 into which the O-ring 6 is fitted is formed on the outer surface of the insertion port portion 3, and the tubes are connected with the O-ring 6 fitted into the annular groove 50. In the present embodiment, the annular groove 50 in which the O-ring 6 is mounted is notched at the distal end edge of the insertion slot 3, but is formed at the base edge or the middle part on the opposite side of the insertion slot 3. May be. Moreover, you may provide in the receptacle part 4 side. The shape and structure of the sealing member such as the O-ring 6 is not particularly limited as long as the space between the insertion port 3 and the receiving port 4 can be reliably sealed, and various shapes and structures of sealing members are mounted at appropriate positions. Can be done. Further, instead of mounting the O-ring 6 separately, it is also possible to integrally form an annular projection serving as a seal portion in advance. A coating agent that can improve waterproofness, weather resistance, and chemical resistance may be coated on the outer surface of the synthetic resin tube with spiral wave 1 C including the insertion port 3 and the receiving port 4 at both ends.

Also, in the insertion port portion in the second to fourth embodiments, the FRP layer 5a can be provided at the connection side end portion on the outer peripheral surface as in the first embodiment.

In the first to fifth embodiments, the FRP layer is formed on the connection side end on the outer peripheral surface of the receiving port and the connection side end on the outer peripheral surface of the insertion port. The FRP layer can also be formed across part or all of the connection side end face of the insertion opening.

When the FRP layer is formed so as to extend from the outer peripheral surface to the end surface in this way, the outer peripheral corner portion on the receiving end connection side is more reliably reinforced.

7. Manufacturing Method of Synthetic Resin Tube with Spiral Wave Next, a manufacturing method of the synthetic resin tube with spiral wave 1C will be described with reference to FIGS.

As shown in FIG. 17, the manufacturing procedure of the synthetic resin tube with spiral wave 1 C includes the step S 1 of forming the tube wall 2 of the synthetic resin tube with spiral wave 1 C, and the composite with spiral wave formed continuously. A step S2 of coaxially forming a pipe material 7 having a diameter larger than that of the synthetic resin pipe with a spiral wave at the other end 102a of the resin pipe 1C, and axially inner and outer ends of the molded pipe material 7 are respectively provided. Synthetic resin material for forming the synthetic resin layer 8 in the gap between the step S3 of sealing with the sealing chucks 60 and 61 and the tube material 7 sealed with the sealing chuck and the synthetic resin tube wall 2 with spiral wave. And step S4 of injecting.

For forming the tube wall 2 in the step S1, the same method as the conventional method for forming a synthetic resin tube with a spiral wave can be used. As shown in FIG. After being deformed into an M-shape in cross-sectional view, this is sent out in a spiral shape, and the outer winding tape (outer surface layer 24) is continuously fed out from the base 81 in the same spiral shape on the outer surface side, and is attached, The inner wall tape (main body portion 20) is also continuously spirally fed out from the base 82 and attached to the inner surface side, and the tube wall 2 is formed by joining and integrating in the axial direction. In this embodiment, the tube material 7 is not formed at the end portion after the one-end tube wall 2 is completed, but the tube material 7 of the step S2 is formed on the formed tube wall 2 continuously with the step S1. The receiving part 4 is efficiently formed.

The tube material 7 to be formed in the step S2 is transformed into the M-shaped cross-sectional view of the steel material 22 continuously supplied by the processing roller 93 in the same manner as the formation of the tube wall 2 and then sent out in a spiral shape. Outer winding tape (outer surface layer 24) is continuously fed out in a spiral form from the base 83 and attached to the outer surface side, the inner winding tape is omitted, and the tube material 7 is formed by joining and integrating in the axial direction. . The molded tube material 7 is supported from the outside in the radial direction by a plurality of guide rollers 91 as guide portions, and is supported coaxially with the tube wall 2.

In step S3, the outside of the tube wall 2 is surrounded by a cylindrical outer frame (divided in two).

In addition, a reinforcing fiber is attached in an annular shape to the inner wall (corresponding to one end of the tube wall 2) of the outer frame of the outer frame.

Sealing chucks 60 and 61 are attached to both ends of the tube material 7 with respect to the tube material 7 formed coaxially, and the space between the outer surface of the tube wall 2 and the inner surface of the outer frame is sealed. Although not shown, a sealed space is formed by setting the inner frame that forms the receiving surface 40 of the receiving portion 4 on the inner peripheral surface side of the tube member 7 that projects outward from the tube wall 2. .

Then, in step S4, a synthetic resin material for forming the synthetic resin layer 8 is injected into the sealed space. In this embodiment, the injection is performed through the injection port 62 communicating with the sealing chuck 60 in the axial direction. However, the injection method is not limited at all, and the sealing chuck 61 or the gold for forming the receiving surface 40 is formed. An inlet may be provided in the mold.

When the injected synthetic resin material is foamed, it moves while filling the space, and the synthetic resin material that has reached the inner surface of the outer frame enters the reinforcing fiber attached to the inner wall of the outer frame. While impregnating, the density is increased by the foaming pressure, and an FRP layer as a skin layer is formed.

8). Evaluation of Drop Resistance of Synthetic Resin Tube with Spiral Wave The strength of the synthetic resin tube with spiral wave of the present invention was evaluated by performing a drop test under the following conditions equivalent to the unloading work on site. A synthetic resin pipe with a spiral wave with a joint that does not have an FRP layer was also evaluated by a drop test as a comparative example.

(A) Specimen: Synthetic resin tube with helical wave with φ1000 mm joint, length L: 1350 mm, reinforcing steel plate with a convex cross section in the reinforcing convex part constituting the helical wave.

(B) Receptacle part Formed in a cylindrical shape with foamed resin with a part of the outer peripheral surface of the synthetic resin pipe part with spiral wave as a reinforcing material exposed, and an FRP layer on the connection side end of the outer peripheral face of the acceptor Form and cure for 3 days.

(C) Drop location 1. 1. Asphalt pavement surface Gravel pavement surface (d) 3m drop height (Drop angle of specimen: 45 ° oblique)
(E) Number of samples: Asphalt test: 3; Gravel test: 3

(F) Comparative Example Three synthetic resin tubes with spiral waves with joints having the same configuration as the above configuration except for not including an FRP layer: three for asphalt test and three for gravel test were prepared.

When a drop resistance test was performed under the above conditions, the synthetic resin pipe with a spiral wave with a joint not provided with the FRP layer was dropped onto an asphalt pavement surface, gravel pavement as shown in FIG. Along with the fall on the surface, cracks due to the drop occurred on the outer periphery of the receiving port.

In particular, as shown in the enlarged view of FIG. 18 (b), a defective portion D occurs in a portion that directly collides with an asphalt pavement surface or a gravel pavement surface, and a crack is generated along the edge of the tube material 7 to cause a pipe material. The end of 7 was exposed. In the figure, E indicates the fracture surface.

On the other hand, as for the synthetic resin pipe with a swivel with an opening according to the present invention, as shown in FIG. However, no cracks occurred on the outer peripheral surface of the receiving port.

FIG. 19 (b) is an enlarged view of the scratch F. Although the line 8b forming the edge of the outer peripheral surface of the receiving port was lost over the range 8c, there was no problem in strength.

The present invention is not limited by the above-described embodiment, and can be implemented with appropriate modifications within a range that can be adapted to the gist of the present invention, all of which are within the technical scope of the present invention. Is included.

The present invention can be used as a synthetic resin pipe applied to a drain pipe under a road, a large drain pipe for sewer, or the like.

1A, 1B, 1C Synthetic resin tube with spiral wave 2 Tube wall 2a Recess 3 Insert port 4 Receiving port 5 Synthetic resin layer 5a FRP layer 6 O-

ring

7, 7A Tube material 7B Reinforcement fiber 7C Reinforcement fiber chip 8 Synthetic resin layer 8a FRP layer 9

Mounting screw

10, 11 End portion 20 Body portion 21 Reinforcement convex portion 22 Steel material 23 Recessed portion 24 Outer surface layer 40 Receiving surface 42 Stepped taper portion 50

Annular groove

60, 61 Sealing chuck 62 Inlet 70 Engagement protrusion 71

Tube wall

81, 82, 83 Base 91

Guide roller

92, 93 Processing roller 102a Other end 110 Tube S Connection structure

Claims

A foamed molded body formed into a tubular shape, a tubular tube wall that is entirely or partially embedded in the foamed molded body, and disposed in a valley portion of the tube wall and covered with the foamed molded body. And a synthetic resin pipe characterized by comprising one or a plurality of pipe bodies.
The synthetic resin pipe according to claim 1, wherein the pipe body is composed of at least one selected from a resin pipe, a resin tube, and a resin hose.
The synthetic resin pipe according to claim 1 or 2, wherein the pipe body is arranged so as to surround a circumferential region of a valley portion of the pipe wall.
The synthetic resin pipe according to any one of claims 1 to 3, wherein the foamed molded body is molded on both ends of the pipe wall.
The synthetic resin pipe according to any one of claims 1 to 4, wherein the synthetic resin pipe is a joint composed of the foam molded body, the pipe wall, and the pipe body.
The synthetic | combination of any one of Claim 1 to 5 with which the said foaming molding is shape | molded by the outer surface of the said tube wall, and a part of inner surface, and the other part of the said inner surface is wound with the foam sheet. Resin tube.
The said pipe wall consists of a cylindrical main-body part and the reinforcement convex part of the cross-sectional convex shape spirally wound by the outer surface of the said main-body part at a fixed space | interval. A synthetic resin tube as described in 1.