JP3877545B2 - Manufacturing method and apparatus for manufacturing modified cross-section pipe - Google Patents

Description

【００３２】
この発明は、連続成形、バッチ成形のいずれにも採用でき、また、芯型には、回転マンドレルによるもの、固定マンドレルにダンボールなどの紙帯を巻回して形成するもの、特開平９−３１４５８１号公報に記載のように、無端スチールベルトによるもの等、周知のものを採用し得る。
【００３３】
【発明の効果】
この発明は、以上のようにして、芯型に巻回される成形材料の厚みを一定にしたので、断面異形の芯型に直接にその成形材料を巻回して、異形断面管を製造できるので、その生産性がよいうえに、精度も高いものとし得る。
【図面の簡単な説明】
【図１】一実施例の概略正面図
【図２】同実施例の概略斜視図
【図３】同実施例の要部概略図
【図４】他の実施例の要部概略図
【図５】他の実施例の要部概略図
【図６】楕円管の断面図
【図７】楕円管の製造説明図
【図８】カルバートの各態様図
【図９】カルバートの二次覆工材施工説明図
【符号の説明】
１ マンドレル
２ 離型テープ
３、５ ＦＲＰ
４ レジンモルタル
６ ホッパー
７ 不織布
３１ 強化繊維クロスボビン
３２ 強化繊維クロス
３３ 樹脂含浸槽
３４ クロス案内ロール
４０ アキューム手段
４１ アキュームローラ
４２ コイルばね
４３ クロス送り出しローラ
４４ クロス引張り治具
Ｐ 異形断面管
Ｑ カルバート[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a modified cross-section tube having a non-circular cross section and a manufacturing apparatus therefor when a tube is manufactured by winding a molding material around a cylindrical core mold. Here, the term “non-circular” means an oval, an ellipse, a polygon such as a quadrangle, a hexagon, or the like (hereinafter the same).
[0002]
[Prior art]
The reinforced plastic pipe includes a fiber reinforced plastic pipe (hereinafter referred to as an FRP pipe) and a pipe (hereinafter referred to as an FRPM pipe) in which resin mortar is arranged in an intermediate layer of the FRP pipe.
[0003]
As an example of the manufacturing method of the reinforced plastic pipe, there is a filament winding method, which will be described with reference to FIGS. 1 and 2 showing an embodiment of the present invention. Paper and cellophane are placed on a rotating mandrel 1. A release tape 2 made of tape or the like is spirally wound to form a core mold, and FRP3, resin mortar 4 and FRP5 are sequentially fed onto the core mold and wound in the axial direction of the mandrel 1, and a heater 8 After being cured by heating, the sheet is taken out by a take-up machine 9 and cut to a required length, and is pulled out from the core mold to obtain a reinforced plastic pipe P. This pipe P is an FRPM pipe. In the FRP pipe, the resin mortar 4 is not interposed, and the FRPs 3 and 5 are wound in a required layer. In the figure, 6 is a hopper and 7 is a non-woven fabric for conveying mortar.
[0004]
By the way, in recent years, aging of concrete box culverts has progressed, and as a renewal secondary lining material, an FRP pipe or an FRPM pipe has been laid in the culvert. As the cross-sectional shape of the culvert Q, there are those shown in FIGS. 8A to 8J, and the secondary lining material pipe P laid on the culvert Q suppresses the reduction of the flow area as much as possible. Therefore, it is preferable to follow the inner shape of the culvert Q as much as possible. More preferably, a similar shape is good. In the figure, W indicates the water level flowing through the culvert Q.
[0005]
However, it is very difficult to manufacture the pipe P having a cross-sectional shape similar to the inner surface shape of each culvert Q. For example, in the culvert Q shown in FIG. 8 (h), as shown in FIG. The tube P having an elliptical cross section is used.
[0006]
As a method of manufacturing the reinforced plastic pipe P having an elliptical cross section, Japanese Patent Publication No. 61-55461 (Publication 1), Japanese Patent Publication No. 61-60765 (Publication 2) and Japanese Patent Publication No. 9-314581 (Publication 3). ) Etc. In any of the above-described manufacturing methods, before the tube P is cured, the outer surface of the tube P is pressed with a roller (roll) or a molded plate, and the cross-sectional shape of the tube P is changed from a circle to an ellipse, an egg. It is cured after being deformed into a polygon such as a shape or a quadrangle.
[0007]
[Problems to be solved by the invention]
The manufacture of the modified cross-section pipe using the roller and the pressing plate requires the roller device and the pressing plate device separately, and there is a problem in the installation space and cost. In addition, molding with a roller and a pressing plate is inferior in terms of quality such as accuracy and internal stress.
[0008]
This invention makes it a subject not to make it deform | transform after the shaping | molding of the pipe | tube P but to shape | mold a deformed cross-section pipe | tube on a core type from the shaping | molding initial stage.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, first, the cross section of the core mold itself is modified. If the shape is irregular, if the molding material is wound around the core mold, the tube made of the molding material layer also has the same irregular cross section and is wound, so that the molding accuracy is increased.
[0010]
Next, according to the present invention, the amount of the molding material fed into the core mold is always kept constant. This is because the thickness of the molding material layer, that is, the tube thickness (thickness) is maintained constant because the feed amount is constant. For this reason, “the feed amount is always constant” has the same meaning as “the tube thickness (wall thickness) is always constant”.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
As an embodiment of the present invention, a core mold is rotated around its cylinder axis, a molding material is fed around the core mold outer surface and wound around the core mold to form a molding material layer, and the molding formed into the cylinder shape In the method for producing a reinforced plastic pipe P by pulling out a material layer from a core mold, the molding material is made such that the cross section of the core mold is non-circular and the amount of the molding material fed into the core mold is always constant. A configuration in which the thickness of the layer is constant may be employed.
[0012]
Here, as described above, “the feed amount is always constant” means “the tube thickness (wall thickness) is always constant”, so that the constant is wound around the outer surface of the core mold. This means that the amount of molding material to be produced is constant and the tube thickness is constant. As a means for “constant feeding amount always constant”, (1) the peripheral speed of the outer peripheral surface of the core die at the point where the molding material is fed It is considered that the feed rate per unit time is constant if it is constant, and (2) if the peripheral speed of the core type outer peripheral surface is not constant, the feed amount per unit time is changed according to the change in the peripheral speed. It is done. When the outer peripheral speed of the core die is constant, there is an advantage that inertia force does not act on the molding material to be fed.
[0013]
When the peripheral speed changes, the tension with which the molding material is pulled to the core mold changes in accordance with the change, and this affects the amount of the molding material that is fed. Therefore, the tension is preferably constant. In particular, when impregnating a strip of glass fiber with a resin or placing resin (mortar) on a strip of nonwoven fabric and feeding it into the core mold, the tension on the strip of glass fiber or the like changes due to changes in peripheral speed. However, a phenomenon such as the resin being squeezed due to the change in tension occurs and the “feed amount is not always constant”. Therefore, in this case, it is preferable to control the tension to be constant.
[0014]
Specific means for always keeping the amount of the molding material fed are as follows: (1) The core mold is rotated and the molding material is kept constant so that the outer peripheral speed at the point where the core mold molding material is fed is constant. (2) The molding material is fed directly or indirectly to the outer surface of the core by an extruder, and the extrusion amount by the extruder is adjusted according to the change in the outer peripheral speed at the point where the molding material is fed. Or when the molding material is fed directly from the extruder or hopper to the core mold, the size of the extruder or hopper delivery port is controlled by a damper or the like in accordance with the change in the peripheral speed. In this case, the amount of the molding material fed is always kept constant, and, further, (4) if the molding material is in a strip shape, an accumulating means is provided in the middle of the feeding path, Is used at a constant speed, and the feeding speed of the molding material is adjusted by the accumulating means in response to the change in the outer peripheral speed at the point where the core molding material is fed.
[0015]
The former manufacturing apparatus consisting of means having a constant outer peripheral speed comprises a servo motor capable of adjusting the rotational speed of the core mold and an extruder for feeding the molding material to the outer surface of the core mold. A configuration in which a fixed amount of molding material is fed per unit time from the extruder and the outer peripheral speed of the core die is made constant by the servo motor can be adopted. At this time, the molding material is supplied from the hopper to the extruder. At that time, the molding material may be fed directly from the extruder to the core mold, or may be placed on the nonwoven fabric without being fed directly. it can. Further, the extruder may be omitted and the hopper may be fed by its own weight.
[0016]
As the manufacturing apparatus comprising the latter means whose outer peripheral speed is not constant, there are means for rotating the core mold, means for feeding and winding the belt-shaped molding material around the outer surface of the core mold, and an accumulator provided in the middle of the feeding path of the molding material The accumulating means is provided with an accumulating roller that pushes the molding material out of the path by a spring between the guide rollers of the feeding path, and responds to changes in the winding speed of the molding material due to changes in the peripheral speed of the core mold. A configuration in which the accumulator roller advances and retreats can be adopted. As a means for advancing and retracting the accumulator roller, mechanical means such as a cam, a servo motor driven screw jack, and a hydraulic cylinder capable of adjusting the amount of expansion and contraction can be adopted in addition to the spring.
[0017]
In the above embodiment, when the molding material is fed directly from the extruder or hopper to the core mold, the gap between the extruder or hopper feed port and the core mold outer surface changes as the core mold rotates, so the feed port is also It is possible to contact and separate from the core mold so that the delivery port does not interfere with the core mold, and the gap is always kept constant so that the change in the gap does not affect the feeding amount. However, if the gap change can be absorbed by controlling the delivery amount, the delivery port may be set to a certain height so as not to interfere.
[0018]
It should be noted that the present invention can be adopted even when only a glass fiber or the like not impregnated (mounted) with a resin or the like is used as a molding material.
[0019]
【Example】
FIG. 1 to FIG. 3 show an embodiment, and this embodiment shows an FRPM pipe P having an elliptical cross section consisting of an FRP layer 3 on the inner surface, a resin mortar layer 4 on the middle, and an FRP layer 5 on the outer surface, as shown in FIG. The pipe P to be manufactured is used as a secondary lining material for the culvert Q in FIG. 8 (h) as shown in FIG.
[0020]
As shown in FIG. 1 and FIG. 2, the manufacturing apparatus has a cylindrical mandrel 1 that is supported by a base D in a cantilever shape and is rotatable about its axis. The machine rotates at a constant angular velocity. The cross section of the mandrel 1 has an oval shape whose outer surface corresponds to the inner surface of the tube P in FIG. Cellophane tape 2, FRP 3, resin mortar 4 and FRP 5 are sequentially fed and wound in the axial direction of mandrel 1 to form tube P made of these molding materials. The tube P has the same elliptical shape as the cross-sectional shape of the mandrel 1, is cured by the heater 8, is taken up by the take-up machine 9, and is cut to a required length.
[0021]
The cellophane tape 2 is drawn out by a rotating force of the mandrel 1 from a bobbin (not shown). As shown in FIG. 3, the fiber cloth 32 is drawn out from the reinforcing fiber cloth bobbin 31, and the cloth 32 is formed through the resin impregnation tank 33 to reach the mandrel 1. An accumulating means 40 is provided between the guide rolls 34 on the way. The accumulating means 40 includes an accumulating roller 41 supported by an upper wall so as to be movable up and down, and a coil spring 42 for urging the roller 41 downward. . The urging force of the coil spring 42 expands and contracts according to the tension T of the cloth 32 from the accumulator 40 toward the mandrel 1, and the cloth 32 is sent out from the tank 33 at a constant speed. Instead of the fiber cloth 32, various materials such as fiber roping, fiber tape, and fiber mat can be employed.
[0022]
Here, as shown in FIG. 7, when the cross 32 is wound around an elliptical mandrel 1, if the angular velocity of the mandrel 1 is ω, its short axis radius is r ₁ , and its long axis radius is r ₂ , the short axis The peripheral speed V ₁ = r ₁ · ω and the long axis peripheral speed V ₂ = r ₂ · ω = r ₂ / r ₁ · V ₁ . From this, the long axis peripheral speed V ₂ is proportional to the long / short axis length ratio of the short axis peripheral speed V ₁ .
[0023]
For this reason, the peripheral speed V ₂ of the long axis increases in proportion to the peripheral speed V ₁ of the short axis, and the increase / decrease of the peripheral speed changes with a quarter period as a boundary. The extra length of the material must be absorbed at all times. The extra length Li at an arbitrary position for absorption is (V ₂ −V ₁ ) · π / 2ωi. This extra length Li is ensured by the accumulating means 40.
[0024]
Thereby, the speed of the cloth 32 sent out from the tank 33 becomes the same, the amount of the resin impregnation becomes constant, and even if the winding speed of the cloth 32 around the mandrel 1 changes, the laminated thickness becomes constant.
[0025]
The accumulating means 40 can be used not only for the FRPs 3 and 5 but also for the mortar 4 that is placed on the nonwoven fabric 7 and fed.
[0026]
As shown in FIG. 4, the accumulating means 40 has a structure in which a feed roller 43 is provided at the subsequent stage of the resin impregnation tank 33, and the cross 32 is sent out from the tank 33 at a constant speed by this roller 43, and the mandrel 1 is wound up. Depending on the speed, the cross 32 between the guide rollers 34 can be accumulated between the solid line and the chain line in FIG. At this time, the “maximum sag” time corresponds to the peripheral speed of the short shaft diameter r ₁ , and the “minimum sag (linear)” time corresponds to the peripheral speed of the long axis diameter r ₂ .
[0027]
In each of the above embodiments, the rotation speed (angular velocity) of the mandrel 1 is constant. However, the angular velocity of the mandrel 1 is varied by a servo motor or the like, and the winding speed of the cross 32 (the winding point of the mandrel 1 is changed). The outer circumferential speed) is always constant, the passage time of the cloth 32 through the tank 33 is constant, and the lamination thickness can be constant.
[0028]
At this time, from V ₁ = V ₂ , r ₁ ω ₁ = r ₂ ω ₂ and ω ₂ = r ₁ / r ₂ · ω ₁ . Therefore, so that the may be changed angular velocity to _{ω 1 ~r 1 / r 2 ·} ω 1. The peripheral speed at an arbitrary position is V _i = r _i · ω _i = ω _i {r ₂ ² cos ² (ω _i t) + r ₁ ² sin (ω _i t)} ^1/2 = constant, and thus Similarly, ω _i is controlled within a unit time (t). The time is 0 to π / 2ω _i (s), and the angular velocity is r ₁ / r ₂ · ω _{1 to} ω ₁ (rad / s).
[0029]
In addition, as shown in FIG. 5, in the embodiment of FIG. 4, a jig 45 that can grasp the cross 32 and change its passing resistance force is provided, and according to the change in tension based on the change in the peripheral speed, The gripping force can be changed to keep the tension from the core mold to the cloth 32 constant. At this time, the tension can also be adjusted by the movement of the jig 45 before and after the illustrated arrow. The grip force may be omitted and the tension may be adjusted only by this longitudinal movement.
[0030]
Incidentally, in these embodiments, as shown in FIG. 9, when the elliptical pipe P is used as the secondary lining material of the culvert Q, the dimensions of the pipe Q are set as shown, and the required flow rate is 1.392 ( m ³ / s), according to the long / short axis ratio (short axis r ₁ / long axis r ₂ ), the flow rate becomes the value shown in Table 1, and the long axis radius length r ₂ = 1.1 m. It can be seen that the above is sufficient. In the case of a round tube, the diameter is 900 mm, and the flow rate = π / 4 × 0.9 ² × 0.225 ^2/3 × (1/300) ^1/3 /0.0012=1.132 m ³ / S and the required flow rate cannot be obtained.
[0031]
[Table 1]

[0032]
The present invention can be employed for both continuous molding and batch molding. The core mold is formed by a rotating mandrel, the core is formed by winding a paper strip such as cardboard around a fixed mandrel, Japanese Patent Application Laid-Open No. 9-314581 As described in the official gazette, a known one such as an endless steel belt may be employed.
[0033]
【The invention's effect】
In the present invention, since the thickness of the molding material wound around the core mold is made constant as described above, it is possible to manufacture the irregular cross-section tube by winding the molding material directly on the core mold having an irregular section. The productivity is good and the accuracy can be high.
[Brief description of the drawings]
FIG. 1 is a schematic front view of an embodiment. FIG. 2 is a schematic perspective view of the embodiment. FIG. 3 is a schematic view of a main portion of the embodiment. ] Schematic diagram of the main part of another embodiment [FIG. 6] Cross-sectional view of an elliptical tube [FIG. 7] Manufacturing explanatory diagram of the elliptical tube [FIG. 8] Each aspect of culvert [FIG. 9] Construction of secondary lining material of culvert Illustration [Explanation of symbols]
1 Mandrel 2 Release tape 3, 5 FRP
4 Resin mortar 6 Hopper 7 Non-woven fabric 31 Reinforced fiber cross bobbin 32 Reinforced fiber cloth 33 Resin impregnation tank 34 Cross guide roll 40 Accumulating means 41 Accumulating roller 42 Coil spring 43 Cross feeding roller 44 Cross tension jig P Deformed cross section pipe Q Calvert

Claims (6)

The core mold is rotated around the cylinder axis, the molding materials 3, 4, and 5 are fed around the core mold and wound around the core mold to form a molding material layer, and the molding material layer formed in the cylindrical shape is In the method of manufacturing the reinforced plastic pipe P by pulling it out from the core mold,
The molding material directly to the core type outer surface feed write free and together by an extruder, a cross section of the core-type and non-circular, and the outer surface of that extrusion infeed amount of the extruder, the molding material is fed Production of a modified cross-section tube characterized in that the thickness of the molding material layer is made constant by always adjusting the amount of the molding material fed to the core mold to be constant in accordance with the change in peripheral speed. Method. The core mold is rotated around the cylinder axis, the molding materials 3, 4, and 5 are fed around the core mold and wound around the core mold to form a molding material layer, and the molding material layer formed in the cylindrical shape is In the method of manufacturing the reinforced plastic pipe P by pulling it out from the core mold,
The molding material directly to the core type outer surface feed write free and both by its own weight from the hopper, the cross section of the core type is non-circular, and the outer surface of the feed amount from the hopper, that the molding material is fed Production of a modified cross-section tube characterized in that the thickness of the molding material layer is made constant by always adjusting the amount of the molding material fed to the core mold to be constant in accordance with the change in peripheral speed. Method.   In the manufacturing method of the irregular cross-section pipe according to claim 1 or 2, instead of adjusting the amount of feeding from the extruder or hopper according to the change in the outer peripheral speed of the point at which the molding material is fed. The core mold is rotated so that the outer peripheral speed at the point at which the molding material of the core mold is fed is constant, and the molding material is fed at a constant amount per unit time so that the amount of the molding material fed is always reduced. A method of manufacturing a modified cross-section tube characterized by being constant. The core mold is rotated around the cylinder axis, the molding materials 3, 4, and 5 are fed around the core mold and wound around the core mold to form a molding material layer, and the molding material layer formed in the cylindrical shape is In the method of manufacturing the reinforced plastic pipe P by pulling it out from the core mold,
When the cross-section of the core mold is non-circular and the molding material is strip-shaped, accumulating means 40 is provided in the middle of the feeding path, the core mold is rotated at a constant speed, and the core mold Corresponding to the change in the outer peripheral speed of the point at which the molding material is fed, the accumulating means adjusts the feeding speed of the molding material so that the feeding amount of the molding material to the core mold is always constant, A method of manufacturing a modified cross-section tube, characterized in that the thickness of the molding material layer is constant.   4. An apparatus for manufacturing a modified cross-section pipe according to claim 1 cited in claim 3, wherein said core mold outer peripheral speed is made constant by a servo motor capable of adjusting the rotation speed of said core mold. An apparatus for manufacturing a modified cross-section pipe, characterized in that   In the apparatus which makes the manufacturing method of the unusual cross-section pipe of Claim 4, it provided in the middle of the means to rotate a core mold | type, the means to send and wind a strip | belt-shaped molding material on an outer surface of a core mold, and the feeding path of the molding material The accumulating means includes an accumulating roller that pushes the molding material out of the path by a spring between the guide rollers of the feeding path, and changes the winding speed of the molding material due to a change in the peripheral speed of the core mold. The apparatus for producing a modified cross-section tube, wherein the accumulator roller is advanced and retracted accordingly.

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