JPH02194934A - Socket and spigot joint structure in resin composite pipe and manufacture of socketed resin composite pipe - Google Patents

Abstract

PURPOSE:To contrive to improve the joint strength and watertightness of a resin composite pipe by a method wherein the end face, which faces into a socket part, of a synthetic resin pipe is covered with outer layer constitutional material and, at the same time, the synthetic resin end face at a spigot part is covered with the outer layer constitutional material. CONSTITUTION:Core pipe D has grooves 164..., which are formed on the socket forming parts 161... or socket forming connecting members 16... and grooves 175... of spigot forming connecting members 17... and the surface of the core pipe D is made smooth by burying the grooves 164 and 175 with proper filler. The core pipe D is fed to a stock pipe making means 2 so as to produce resin composite stock pipe E by forming outer layer constitutional material layer onto the outer peripheral surface of the core pipe. In addition, the outer layer constitutional material 20 also enters in gaps S and W, which are respectively ensured just before the end faces of synthetic resin pipe C by midget stoppers 167, 168, 176 and 177 of the respective connecting members 16 and 17. As a result, the end faces of the synthetic pipes C... are covered with the outer layer constitutional material 20. A cutting means 4 cuts off the resin composite stock pipe E, which is fed out of a stock pipe take-off means 3, at their cutting positions or the connecting sites of the synthetic resin pipes C....

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a receiving and connecting structure for a resin composite pipe and a method for manufacturing a resin composite pipe with a socket.

(Prior Art) Pipes made of thermoplastic resin such as hard vinyl chloride resin have excellent corrosion resistance, but do not have very high mechanical strength such as pressure resistance and impact resistance. For this reason, it could not withstand use in harsh environments, such as piping materials for chemical plants that transport high-temperature, high-pressure chemical solutions, or as materials for underground pipes that are subject to external pressure. . Therefore, resin composite pipes have been proposed that have improved mechanical strength while retaining the excellent corrosion resistance of thermoplastic resins, and are currently widely used in various fields. This resin composite pipe is made by laminating various outer layer constituent materials, including fiber-reinforced thermosetting resin, on the outer peripheral surface of a thermoplastic resin pipe.
By doing so, the desired mechanical strength is obtained.

Conventionally, as methods for manufacturing such resin composite pipes, the following two methods have been disclosed, for example, in Japanese Patent Application Laid-Open No. 57-207061. First, the first method is to apply fiber-reinforced thermosetting resin (hereinafter referred to as FR) to the outer peripheral surface of the thermoplastic resin pipe.
It's called P. ) After applying surface treatment to enhance the adhesion effect with FRP, the FRP is wound, then resin concrete is wound thereon, and finally FRP is wound again. The second method is to fit a pipe wrapped with FRP into a mold with an FRP layer formed on the inner surface, and pour uncured resin concrete into the gap between the mold and the pipe and allow it to harden. After integrating the two, the mold is removed.

By the way, in order to connect the resin composite pipes mentioned above,
As with other synthetic resin pipes, a socket is provided at one end of the pipe, and the socket of another pipe is inserted into the socket for connection.In this case, conventionally, The inner circumferential surface of the receptacle and the outer circumferential surface of the insertion port are bonded with adhesive.

In addition, in order to perform the above-mentioned socket connection, it is of course necessary to prepare a resin composite pipe with a socket having a socket on at least one end, but as a method for manufacturing such a pipe, Conventionally, a method described in, for example, Japanese Unexamined Patent Publication No. 54-146871 is known.

The manufacturing method involves laminating the molding material around a core mold that moves in the axial direction while rotating in the circumferential direction and a socket molding material mounted on the core mold, and then passing the molding material through a curing furnace. After curing, this is removed from the core mold, the straight pipe part and the socket part are cut with a cutting blade, and finally the mold material for molding the socket is separated, and it is manufactured by this method. In the resin composite pipe with a socket, the straight pipe part and the socket part are each made of a layer of molding material having a predetermined thickness.

(Problems to be Solved by the Invention) However, the method for manufacturing a resin composite pipe described in the above-mentioned Japanese Unexamined Patent Publication No. 57-207061 has the following problems.

That is, in the case of the first manufacturing method, as shown in FIG. 23, the outer layer constituent material a such as FRP is spirally wound at a constant pitch in the parts other than both ends of the tube. At both ends, which are the beginning and end of the winding of the outer layer constituent material a, the outer layer constituent material a is wound several times along the tube end (so-called extra winding is performed. This extra winding is This must be done to prevent the outer layer constituent material a from getting wrapped around the chucking device that holds the pipe, and to ensure a good finish at the end of the pipe. There is a problem in that there is inevitably a difference in the laminated thickness of the outer layer constituent material a between both ends and other parts, making it impossible to obtain a resin composite pipe having a uniform outer layer constituent material layer over the entire length of the tube. , since the winding pitch of the outer layer constituent material a is not uniform throughout,
There was also the problem that the appearance deteriorated. Furthermore, since the process involves so-called batch processing in which the outer layer material is wound around each thermoplastic resin pipe one by one, there are problems in that the work efficiency is poor and the productivity is poor.

In addition, in the case of the second method described in Japanese Patent Application Laid-Open No. 57-207061, 6. Inside the mold with an FRP layer formed on the inside,
Since a tube wrapped with FRP is inserted into the mold and resin concrete is poured into the gap between the mold and the tube and hardened, this method requires batch processing. Therefore, this method also has the problem of poor working efficiency and poor productivity. In addition, a mold is prepared separately,
Since it is necessary to form an FRP layer on the inner surface, there is also the problem that the process becomes complicated. Furthermore, it is necessary to use a furnace for curing the resin concrete that is suitable for the longest pipe, which results in large-scale equipment, which is economically disadvantageous.

Furthermore, in any of the above methods, since the ends of the thermoplastic resin pipe are exposed to the outside at both ends of the resin composite pipe to be manufactured, especially when the ends of the pipe are subjected to impact, There was a problem in that the outer layer constituent material layer easily peeled off from there. Therefore, special care must be taken during transportation and piping, making handling inconvenient.

In addition, in the case of the above-mentioned conventional socket-insertion connection in the resin composite pipe, the socket part, like the straight pipe part, often has a multilayer structure consisting of a core material and an outer layer of material. The adhesion with the mouth portion is the adhesion between the inner circumferential surface of the core material and the outer layer constituent material layer.

If the core material is a thermoplastic resin and the outer layer constituent material is a thermosetting resin, adhesion between the two becomes extremely difficult. For this reason, there were problems such as low connection strength (and poor watertightness).

On the other hand, the manufacturing method disclosed in JP-A-54-146871 mentioned above had the following problems.

That is, since no measures have been taken to determine the mounting position of the socket molding material, there is a problem in that the length of the tube varies.

In addition, if continuous production is attempted, it will be necessary to attach the socket molding material to a predetermined position on the core mold while synchronizing the timing with the movement of the core mold that rotates in the circumferential direction and moves in the axial direction. In reality, such a thing is almost impossible. Therefore, there was a problem that continuous production of resin composite pipes with sockets could not be carried out.

Furthermore, since this method is exclusively aimed at manufacturing a resin composite pipe with a socket, in which the straight pipe part and the socket part are each composed of a layer of molding material with a predetermined thickness, it is possible to It was not possible to manufacture resin composite pipes using tubes as the core material.

The present invention has been made in order to solve the problems of the above-mentioned conventional techniques, and provides a receiving and inserting connection structure for resin composite pipes with excellent connection strength and watertightness, and a structure suitable for the connection structure. The present invention aims to provide a method for manufacturing a resin composite pipe.

Another object of the present invention is to provide a method that can efficiently and continuously manufacture a resin composite pipe with a socket in which the thickness of the outer layer material such as FRP is uniform over the entire length of the pipe.

(Means for Solving the Problems) In order to achieve the above object, the receiving and connecting structure for the resin composite pipe according to the present invention is such that an outer layer constituent material layer is formed on the outer peripheral surface of the synthetic resin pipe serving as the core material. A resin composite pipe with a socket, which has a socket at one end, and a resin composite pipe in which an outer N constituent material layer is formed on the outer peripheral surface of a synthetic resin pipe serving as a core material, and a resin composite pipe that has a socket at at least one end. In the socket-equipped resin composite pipe, the socket part is formed of the outer layer material, and the pipe end surface of the core material facing into the socket part is covered with the outer layer material. On the other hand, in the resin composite tube, the pipe end surface of the core material at the insertion part is covered with an outer layer constituent material, and the insertion part of the resin composite pipe thus made is a receptacle of the resin composite pipe with a socket. The outer layer constituent materials inserted into the mouth part and covering the pipe end faces of each of the core materials are brought into contact with each other, and the inner circumferential surface of the socket part and the outer circumferential surface of the socket part are brought into contact with each other. are fixed with adhesive.

Further, the method for manufacturing a resin composite pipe with a socket according to the present invention includes rotating a synthetic resin pipe of a fixed length around its pipe axis and moving it forward along the pipe axis, and also rotating and moving the synthetic resin pipe forward. A synthetic resin pipe of the same standard length as the wire pipe is connected to the rear end of the synthetic resin pipe via a socket molding connecting member that can transmit motion and has a socket molded part in the axial center. Then, the connected synthetic resin pipe is connected to the rear end of the connected synthetic resin pipe via a socket-forming connecting member that can transmit the rotational motion and forward movement of the wire tube, or again to the socket-forming joint. Synthetic resin pipes of the same standard length as the wire pipes are connected via the member, and the connecting member for socket molding and the connecting member for socket molding are alternately connected between the synthetic resin pipes of the standard length in the same manner. A step of sequentially connecting the synthetic resin pipes by interposing the connecting member for socket molding or by interposing only the connecting member for socket molding to form a core pipe in which a plurality of synthetic resin pipes are connected and integrated; A step of winding and laminating an outer layer constituent material around the outer circumferential surface of the core tube which moves forward along the tube axis while rotating around the tube axis to form a resin composite original tube; and after curing the outer layer constituent material, the resin This method includes the step of sequentially cutting the composite original tube at the connecting portions of each of the synthetic resin tubes to separate it into regular length resin composite tubes.

Furthermore, the method for manufacturing a resin composite pipe with a socket according to the present invention includes:
In the step of forming the core tube, a connecting member for socket molding and a connecting member for socket molding are provided with a minute stopper that comes into contact with the pipe end face of the synthetic resin pipe to ensure a gap immediately before the pipe end face. In addition, in the step of forming the resin composite original tube, the outer layer constituent material may also be introduced into the gap, and the tube end surface of each synthetic resin tube may be covered with the outer layer constituent material, and this method is suitable for manufacturing a resin composite pipe with a socket suitable for the connection structure described above.

(Function) In the insertion and connection structure for resin composite pipes according to the present invention, the insertion part of the resin composite pipe is inserted into the socket part of the resin composite pipe with a socket, and the core material of each of these pipes is inserted into the socket part of the resin composite pipe with a socket. The outer layer constituent materials covering each tube end surface are abutted against each other, and the outer layer constituent materials and the inner circumferential surface of the socket and the outer circumferential surface of the socket are fixed with adhesive. The bonding area between the tubes is larger than that of simply bonding the inner circumferential surface of the receptacle and the outer circumferential surface of the receptacle. Moreover, since all the bonding surfaces are on the surface of the outer layer constituent material, it is difficult to connect both pipes. The strength and watertightness of the connection portion are extremely high.

In the method for manufacturing a resin composite pipe with a socket according to the present invention,
A core tube is formed by connecting a plurality of fixed-length synthetic resin pipes by alternately using a connecting member for socket molding and a connecting member for insert molding, or using only a connecting member for socket molding. At the same time, this core tube is advanced while rotating around the tube axis, and an outer layer constituent material such as FRP is spirally wound at a constant pitch, and this outer layer constituent material is hardened to form a resin composite master tube. After that, this original tube is cut at the joint portion of the synthetic resin tube. The resin composite pipe with a socket obtained in this way is
The length is always constant, the winding pitch of the outer layer material is constant over the entire length of the tube, that is, the thickness of the outer layer material layer is uniform, and the end of the tube is finished neatly.

Additionally, each process is continuous, greatly improving productivity compared to conventional methods that require batch processing.

In addition, as each of the above-mentioned connecting members, a connecting member for socket molding and a connecting member for spigot molding are provided with a minute stopper for abutting against the pipe end face of the synthetic resin pipe and securing a gap immediately before the pipe end face. At the same time, in the step of forming the resin composite original pipe, the outer layer constituent material is introduced into the gap, and the end surface of each synthetic resin pipe is coated with the outer layer constituent material, so that the outer layer constituent material is spread over the entire length of the pipe. A resin composite pipe with a socket of a regular length having a uniform layer thickness and both end faces of the synthetic resin pipe covered with the material constituting the outer layer can be obtained.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional view showing a receiving and connecting structure in a resin composite pipe according to the present invention.

In this connection structure, the insertion part 8 of the resin composite pipe F1 is inserted into the socket part 9 of the resin composite pipe F2 with a socket, and these resin composite pipes F1. The outer layer constituent materials 20.20 covering the tube end faces 81.91 of each core material C9C of F2 are abutted against each other, and these outer layer constituent materials 20.20 are
The inner circumferential surface of the socket part 9 and the outer circumferential surface of the socket part 8 are fixed with adhesive.

Note that it is preferable to further cover the outer circumferential surface of this connection portion with FRP (indicated by a broken line in the figure) because the connection becomes stronger.

The above resin composite pipe F2 with a socket is a synthetic resin pipe C serving as a core material.
An outer layer constituent material layer 20 is formed on the outer peripheral surface of the holder, and a socket 9 is provided at at least one end. and,
In this resin composite pipe F2 with a socket, the socket part 9 is formed of the outer layer constituent material 20, and the pipe end surface 91 of the core material C facing into the socket part 9 is covered with the outer layer constituent material 20. There is.

On the other hand, the resin composite pipe F1 is a synthetic resin pipe C serving as a core material.
An outer layer constituent material layer 20 is formed on the outer circumferential surface of the holder, and an insertion port 8 is provided at at least one end. and,
In this resin composite tube F2, the tube end surface 81 of the core material C in the insertion port 8 is covered with the outer layer constituent material 20. Note that the resin composite pipe F2 is usually a resin composite pipe with a socket having a socket at the other end (not shown).

The synthetic resin pipe C may be a thermoplastic resin pipe such as vinyl chloride, and the outer layer material 20 may be fiber-reinforced thermosetting resin (FRP).

In the above-mentioned resin composite pipe receiving and connecting structure, the bonding area between the socket part and the insertion part extends from the inner peripheral surface of the socket part and the outer peripheral surface of the socket part to the core of each resin composite pipe. It extends to the surface of the outer layer constituent material that covers each pipe end surface of the material.
Moreover, since the outer layer constituent materials are bonded to each other, high connection strength and watertightness can be obtained at the same time.

Next, an embodiment of the method for manufacturing a resin composite pipe with a socket according to claim 2 of the present invention will be described with reference to FIGS. 2 to 16.

First, the manufacturing apparatus will be explained, and then the manufacturing method will be explained together with the operation of the apparatus.

FIG. 2 is a schematic diagram showing a method for manufacturing a resin composite pipe with a socket and a configuration of a manufacturing apparatus used therein according to the present invention.

The manufacturing device is composed of a core tube making means 1, a raw tube making means 2, a raw tube taking means 3, and a cutting means 4, and a synthetic resin tube making device 5 is installed at the front stage of this manufacturing device. is set up. Here, to explain the synthetic resin pipe making device 5, this device 5 includes a pipe making machine 51 that continuously makes synthetic resin pipes B, and a synthetic resin pipe made by this pipe making machine 51. It is comprised of an automatic cutting machine 52 that cuts the pipe B into a predetermined size to make a synthetic resin pipe C of a fixed length. Pipe making machine 51
For example, a belt-like body A made of synthetic resin with retaining parts (not shown) formed on both side edges is spirally wound to form a cylinder, and adjacent engaging parts are engaged with each other. , to manufacture a synthetic resin pipe B.

In addition, the pipe making machine 51 may be a so-called extruder that produces the synthetic resin pipe B by extruding a molten resin, for example.

Now, the core pipe manufacturing means 1 located at the first stage of the manufacturing apparatus of the present invention is connected to the synthetic resin pipe manufacturing apparatus 5 having the above-described configuration via a pipe guide rail 61. This core pipe manufacturing means 1 connects and integrates synthetic resin pipes C of a fixed length, which are guided by a pipe guide rail 61 and fed from a synthetic resin pipe manufacturing device 5 to a pipe guide rail 61 one after another, into a core pipe. At the same time, the core tube is sent to the next step, the raw tube manufacturing means 2. The core tube manufacturing means l having such a function receives two fixed length synthetic resin tubes C, and has a pedestal 11 that supports the tube C rotatably around its tube axis, and a pedestal 11 that is supported on the pedestal 11. an extrusion device 12 for extruding a synthetic resin tube C in one direction along the tube axis of the wire tube C (rightward in FIG. 1 in this example) without interfering with rotational movement around the tube axis; A sending machine 13 sends out the synthetic resin tube C extruded by the device 12 in the extrusion direction while rotating it around its tube axis.
It is interposed between the rear end of the synthetic resin pipe C being sent out by this sending machine 13 and the front end of the next synthetic resin pipe C, connecting and integrating the two and forming the socket part 9. A plurality of connecting members 14 for socket molding are provided, and a plurality of connecting members 15 for connecting socket molding are provided for connecting and integrating the synthetic resin pipes C with each other and molding the socket part 8. There is.

In addition, when manufacturing a resin composite tube with sockets having sockets 9 at both ends, the above-mentioned connecting member 15 for molding the socket is not used. In FIG. 2, the reference numeral 63 indicates each of the connecting members 14.1.
5 into the synthetic resin pipe C is shown.

The pedestal 11 and extrusion device 12 are constructed as shown in FIGS. 3 and 4. Here 7. FIG. 3 is a partially omitted front view, and FIG. 4 is a right side view of the same.

First, the pedestal 11 will be explained. This pedestal 11 has an 8-8 frame on a horizontal machine frame 111 that receives the lower circumferential surface of the synthetic resin pipe C.
It is provided with three support rollers 112... and three guide rollers 113... that receive the bottom surface of the synthetic resin pipe C, and is installed near the end of the front guide rail 61. There is. The eight support rollers 112... are arranged horizontally in two rows, and each row of support rollers 112..., 1
12 are arranged so that their respective axes are located on the same straight line and are spaced apart from each other by a predetermined interval. and,
The interval between the rows is set smaller than the outer diameter of the synthetic resin pipe C. On the other hand, the three guide rollers 113...
The support rollers 12 are arranged in a row with a predetermined interval between the rows so as to be perpendicular to the axes of the support rollers 112, respectively. In addition, these guide rollers 1
13... are provided at slightly lower positions than the support rollers 112..., respectively. Each of the guide rollers 113... is capable of collapsing in the advancing direction of the synthetic resin pipe C (rightward in FIG. 1), as shown by broken lines in FIG.

Note that the number, installation interval, etc. of the support rollers 112 and the guide rollers 113 are not limited to the above-mentioned example, and are appropriately determined according to the length, outer diameter, weight, etc. of the synthetic resin pipe C.

The extrusion device 12 is installed on the rear end side of the pedestal 11 described above. This extrusion device 12 has a horizontal machine frame 120
and a truck 12 slidably provided on this machine frame 120.
1, a pusher 125 horizontally provided on this truck 121 via supports 124, 124, and a cylinder 128 for moving the truck 121 forward and backward.

The truck 121 is equipped with guide wheels 122, and the machine frame 12
Guided by a guide rail 123 attached to 0,
It is configured to be able to move forward and backward in the direction along the direction of movement of the synthetic resin pipe C. The extrusion tool 125 is the shaft 12
6, and an extrusion plate 1 fixed to the tip of this shaft 126.
It consists of 27. The extruded plate 127 is a disc having a diameter slightly larger than the outer diameter of the synthetic resin pipe C, and the shaft 126 is a support member 12 equipped with a bearing, for example.
It is rotatably supported around the axis by 4°124. The cylinder 128 is actuated by hydraulic pressure or pneumatic pressure, and is arranged at the rear of the truck 121 described above, and is connected to the truck 121 via a rod 129. The extrusion device 12 configured as described above is provided so that the axis of the shaft 126 of the extrusion tool 125 coincides with the tube axis of the synthetic resin tube C on the above-mentioned pedestal 11.

The configuration of the extrusion device 12 is not limited to the example described above, and other configurations may be used as long as the synthetic resin tube C can be extruded in one direction along the tube axis without interfering with its rotation. good. For example, it has a structure in which the synthetic resin pipe C is held or gripped via a plurality of rollers whose axes are parallel to the pipe axis of the synthetic resin pipe C, and the synthetic resin pipe C is moved in a direction along the pipe axis in this state. I can think of things. In addition, an extrusion device (1
2 may be configured such that the extrusion plate 127 is driven by a motor or the like and rotates in synchronization with the delivery device 13.

The feeder 13 is located in front of the pedestal 11, that is, on the opposite side from the above-mentioned extrusion device 12, and at a position where the synthetic resin pipe C extruded from the pedestal 11 can be taken out as it is along the tube axis. It is installed at a predetermined distance from the pedestal 11. This sending device 13 is shown in FIGS. 5 and 6.
As shown in the figure, a plurality of delivery rollers 131 are arranged on the same circumference so as to come into contact with the outer peripheral surface of the synthetic resin pipe C.
It consists of... The respective axes of the delivery rollers 131 are inclined at a certain angle θ with respect to the delivery direction of the synthetic resin pipe C. Further, all or part of these delivery rollers 131 are connected to a drive source (not shown). By rotating the delivery roller 131 in this way in one direction (see arrow P in the figure), the synthetic resin pipe C is sent out in one direction while being rotated around its pipe axis ( Arrow Q in the diagram
and R). The feeding speed of the synthetic resin pipe C can be adjusted by changing the inclination or rotational speed of the feeding rollers 131.
Can be easily adjusted.

Note that the above-mentioned pedestal 11 may have a configuration similar to that of the sending device 13.

The connection member 14 for socket molding is a substantially cylindrical member molded from a synthetic resin material, and as shown in FIGS. 7 and 8, a socket molding portion 141 is formed in the central portion in the axial direction. At the same time, one synthetic resin pipe C is attached to both ends of this socket molding part 14.
A fitting part 142 to be fitted into the end of the synthetic resin pipe C, and a fitting part 143 to be fitted to the end of the other synthetic resin pipe C are formed. The length of the socket molding part 141 is twice the length of the socket part 9 to be molded, and its outer diameter is made equal to the inner diameter of the socket part 9. Furthermore, a groove 144 is formed in the center of the socket molded part 141 over the entire circumference. This concave groove 144 allows the resin composite original tube E to be transferred to a fixed length resin composite tube F with a socket in the final process.
This is to prevent the cutting blade 41 from coming into contact with the socket molding part 141 and damaging the socket molding part 141 when cutting and separating. Therefore, this groove 144
The width of the cutting blade 41 needs to be thicker than the thickness of the cutting blade 41. Further, the depth of the groove 144 must be such that contact with the cutting blade 41 can be avoided. The fitting portions 142 and 143 are formed concentrically with the socket molding portion 141, and when the synthetic resin pipes C2C are connected to each of the fitting portions 142 and 143, the axes of both tubes are aligned. is planned.

Further, it is preferable that the fitting portions 142 and 143 are gradually narrowed toward the respective tips. It absorbs variations in the inner diameter dimension of the synthetic resin pipe C and dimensional errors in the molding of the connection member 14 itself for socket molding, and improves the adhesion between the fitting parts 142, 143 and the inner surface of the synthetic resin pipe C. It's for a reason.

If the fitting parts 142 and 143 are formed in this manner, no slippage will occur between the synthetic resin pipe C and the fitting parts 142 and 143 in either the circumferential direction or the axial direction. The degree to which the fitting portions 142 and 143 are narrowed depends on the length of the fitting portions 142 and 143 themselves, the inner diameter of the synthetic resin pipe C, the magnitude of the frictional force between the fitting portions 142 and 143, and the connection member 14 for socket molding. It is determined as appropriate depending on various conditions such as the molding accuracy itself.

Further, the outer circumferential edges of the tips of the fitting portions 142 and 143 are chamfered 145 and 146, respectively.

The chamfered portions 145 and 146 position the synthetic resin pipe C and the connection member I4 for socket molding, and the fitting portions 142.
143 into the synthetic resin pipe C smoothly. The angle of inclination, width, etc. of these chamfered portions 145 and 146 are appropriately determined according to various conditions, as is the degree of narrowing of the fitting portions 142 and 143.

On the other hand, the connection member 15 for molding the insertion port is a substantially cylindrical member molded from a synthetic resin material, and as shown in FIGS. 9 and 10, one end side is connected to the end of one synthetic resin pipe C. The other end is a fitting part 151 that is fitted into the other end of the synthetic resin pipe C. These fitting parts 151 and 152 are formed concentrically, and each fitting part 151 and 152 has a synthetic resin pipe C1C.
When connected, both tube axes are designed to match. In addition, the fitting portions 151 and 152 are gradually retracted toward the tips, and the outer peripheral edges of the tips are chamfered 153 and 154, similarly to the connection member 14 for socket molding described above. Further, a flange portion 155 is formed all around the boundary portion of the binocular entrance portions 151 and 152, that is, at the center portion in the longitudinal direction. This flange portion 155 is attached to the resin composite raw tube E in the final process.
When cutting and separating into resin composite tubes F of a fixed length, a gap ■ (no. (see Figure 15).

Therefore, the thickness of the flange portion 155 needs to be thicker than the thickness of the cutting blade. In addition, when the synthetic resin pipes C... are connected to form a core pipe, the collar part 155 is designed so that it does not protrude from the outer peripheral surface of the core pipe.
The height of the pipe 55 is set to be smaller than the wall thickness of the synthetic resin pipe C. As shown in FIG. 16, if the flange 155 protrudes from the outer circumferential surface of the core pipe, when the outer layer constituent material 20 is wound around the core pipe, the outer layer is This is because the constituent material 20 may bulge and cause irregular winding, or a cavity T may be formed between the outer layer constituent material 20 and the core tube, which may cause defective products.

Note that the connection member 14 for socket molding and the connection member 15 for socket molding have fitting portions 142, 143°151.15, respectively.
The outer circumferential surface of 2 is not limited to a smooth one. Taking the connection member 15 for molding the insert as an example, for example, FIGS. 11 and 1
As shown in FIG. 2, a plurality of grooves 156 may be formed on the outer circumferential surface of the fitting portions 151 and 152 along the axis.

In this case, the shape of the groove 156 may be any shape, such as a V-shaped cross section, a U-shaped cross section, or a U-shaped cross section.

In this way, the grooves 15 are formed on the outer peripheral surfaces of the fitting parts 151 and 152.
6... can increase the frictional force in the direction around the axis between the fitting parts 151, 152 and the inner surface of the synthetic resin pipe C, compared to the case where the outer circumferential surface is smooth. This is convenient in terms of molding since it is not necessary to make the molding precision of the parts 151 and 152 so high. Also in this insertion port connection member 15, the insertion part 151 is similar to that described above.
, 152 are chamfered 153, 154, and a crocodile portion 155 is formed at the boundary between the fitting portions 151, 152.

Next, the raw tube manufacturing means 2 will be explained. This raw tube manufacturing means 2 is placed next to the core tube manufacturing means 1 described above, and is provided on the outer peripheral surface of the core tube that is sent out from the core tube manufacturing means 1 while rotating around the tube axis. Then, the outer layer constituent material 20 is wound and laminated to produce a resin composite master pipe E. The raw tube manufacturing means 2 having such a function is composed of a surface treatment machine 21, an outer layer constituent material winding section 22, and a hardening furnace 26. In addition, the code|symbol 27 in a figure has shown the roller for supporting a core pipe.

The surface treatment machine 21 is for performing, for example, a sanding process on the outer surface of the core tube so that the adhesiveness between the core tube and the outer layer constituent material 20 is increased. This surface treatment machine 2
1 is located next to the delivery machine 13 of the core tube manufacturing means 1. Note that this surface treatment machine 21 does not necessarily need to be provided.

The outer layer constituent material winding part 22 is an outer layer constituent material 2 such as FRP.
This is for winding the wire around the outer peripheral surface of the core pipe, and is provided next to the surface treatment machine 21.

This outer layer constituent material winding part 22 is a filler filling unit 2
4 and an FRP winding unit 25. The filler filling unit 24 includes a feeder 242 for feeding the filler 241 onto the outer peripheral surface of the core pipe, and a guide roller 244 for winding the nonwoven fabric 243 covering the filler 241.
and a pressing roller 245 for pressing down the wound nonwoven fabric 243. The FRP winding unit 25 also includes an impregnating tank 252 for impregnating glass fibers 251 knitted in a belt shape with a thermosetting resin, and a core tube in which glass fibers (FRP) 253 impregnated with a thermosetting resin are impregnated. A guide roller 254 for winding the FRP 253 around the core tube, and a presser roller 255 for pressing down the FRP 253 wound around the core tube.
They each have the following. Further, the nonwoven fabric 243 and the FRP 253 are both supplied at a constant angle to the tube axis of the core tube so that they are spirally wound around the outer peripheral surface of the core tube at a constant winding pitch. This angle is appropriately determined depending on various conditions such as the outer diameter of the core tube, the rotation speed and transfer speed of the core tube. Moreover, since the core tube advances while rotating, the nonwoven fabric 243 and FRP 253 are automatically wound around the core tube. Therefore, both of the guide rollers 244 and 254 described above usually remain fixed at one location.

Note that the configuration of the outer layer constituent material winding portion 22 is not limited to that described above, and can be changed as appropriate depending on the number of layers formed on the outer peripheral surface of the core pipe, the type of outer layer constituent material, etc. . In addition, in the above example, the glass fiber 251 is impregnated with a thermosetting resin and then wound, but only the glass fiber 251 is wound around the core pipe and then the thermosetting resin is applied thereto. It may be impregnated by the same method.

The curing furnace 26 is for curing the outer layer constituent material 20, such as the filler 24, which is wound and laminated in the outer layer constituent material winding section 22, and is arranged after the FRP winding unit 25. . This curing furnace 26 is used for the outer layer constituent material 2
It has a cylindrical shape, for example, that can cover the core tube around which the wire is wound.

Next, the original pipe collection means 3 will be explained. This raw tube take-up means 3 is installed at the next stage of the raw tube manufacturing means 2 described above, and prevents the movement of the resin composite raw tube E that comes out of the raw tube manufacturing means 2 while rotating. This is for taking the original tube E along the direction of movement. The raw pipe take-up means 3 having such a function has the same configuration as the sending machine 13 of the core tube manufacturing means 1 described above, and its operation is synchronized with the sending machine 13 or slightly slower. It is.

A cutting means 4 is disposed next to the original pipe taking-off means 3. This cutting means 4 cuts the resin composite original tube E taken up by the original tube taking-up means 3 into the synthetic resin tube C...
The tube is cut at the connecting point and separated into regular length resin composite tubes F... The cutting means 4 that functions in this way is
It is provided with a cutting blade 41 that cuts only the outer layer constituent material layer of the resin composite original tube E, and is provided so that it can reciprocate in a certain area along the tube axis direction of the resin composite original tube E at a certain period. This cutting means 4 is controlled by an appropriate control device (not shown), and when the connecting part of the synthetic resin pipe C, which is the cutting part, is at the position of the cutting blade 41 (the cutting part is aligned with the traveling direction of the original pipe E) It starts moving in the same direction and cuts the original tube E while moving at the same speed as the traveling speed of the original tube E, and immediately returns to the initial position after cutting.

In addition, the reference numeral 62 in the figure receives a fixed length resin composite pipe F... with a socket, which is cut and separated by the cutting means 4,
A pipe transfer rail for transferring this to a predetermined location is shown.

Next, a method for manufacturing a resin composite pipe according to the present invention will be explained along with the operation of the manufacturing apparatus described above.

First, the synthetic resin pipe B is continuously produced by the pipe making machine 51 of the synthetic resin pipe making apparatus 5, and is sequentially cut into prescribed dimensions by the automatic cutting machine 52. At one end (the right end in the figure) of the synthetic resin pipe C of a fixed length made in this way,
A connecting member 14 for socket molding and a connecting member 15 for socket molding are connected to a certain synthetic resin pipe C.
, and the next synthetic resin tube C is sequentially and alternately inserted with the connecting member 15 for molding the opening. This work is done on workbench 6.
3. The synthetic resin pipe C, in which the connecting member 14 for socket molding or the connecting member 15 for socket molding is inserted at one end in this way, is guided by the pipe guide rail 61 and is sequentially mounted on the mount of the core tube manufacturing means 1. sent on ll.

When the synthetic resin pipe C is fed onto the pedestal 11, the cylinder 128 of the extrusion device 12 is activated to extend the rod 129. Along with this, the cart 121 moves forward toward the pedestal 11, and the extrusion plate 127 of the extrusion tool 125 comes into contact with the rear end of the synthetic resin pipe C on the pedestal 11. Furthermore, the rod 12
9 extends and the trolley 121 continues to move forward, the synthetic resin pipe C is pushed by the extrusion plate 127 and moves forward on the pedestal 11.

At this time, the synthetic resin tube C rubs against the support rollers 112, but since the liquid tube C is also supported by the guide rollers 113, it moves forward smoothly.

In this way, the synthetic resin pipe C is transferred from the pedestal 11 to the feeder 1.
3 (at this point, the feeder 13
has already started, and soon the front end of the synthetic resin pipe C (in the case of this embodiment, the connecting member 1 for socket molding) is sent to the feeder 13.
4 or the connecting member 15) for insertion molding reaches the outer circumferential surface of the front end portion and the feed roller 131 of the feeder 13 comes into contact with the synthetic resin pipe by the rotating feed roller 131... C starts rotating for the tube axis. At the same time, the guide rollers 113 of the frame 11 supporting the rear half of the synthetic resin pipe C fall down and separate from the synthetic resin pipe C, and the rear half of the synthetic resin pipe C is supported by the support rollers 112...・It will be supported only by. Thereby, the synthetic resin tube C rotates smoothly around the tube shaft. Moreover, since the extrusion plate 127 that is in contact with the rear end of the synthetic resin tube C also rotates together with the synthetic resin tube C, the rotational movement of the synthetic resin tube C is not hindered in any way. Note that the guide rollers 113 of the pedestal 11 may be laid down immediately before the synthetic resin pipe C starts rotating.

As the synthetic resin tube C is fed out by the feeder 13 in the manner described above, it is no longer necessary to continue pushing the synthetic resin tube C from behind, so the rod 129 of the cylinder 128 of the extrusion device 12 retracts. Along with this, trolley 12
1 retreats, and the extrusion plate 127 of the extrusion tool 125 returns to its initial position. When the synthetic resin pipe C is completely separated from the pedestal 11, a stopper (not shown) at the tip of the tube guide rail 61 is released, and the next synthetic resin pipe C is fed onto the pedestal 11.

When the next synthetic resin pipe C is fed onto the pedestal 11 as described above, the cylinder 128 of the extrusion device 12 is immediately activated again to push out the synthetic resin pipe C on the pedestal 11 forward as described above. . Here, the extrusion speed of the synthetic resin pipe C by the extrusion device 12 is as follows:
The rear end of the synthetic resin pipe C before being sent out by the sending machine 12 is set at a speed slightly faster than the sending speed of
While moving between the pedestal 11 and the feeder 13, the synthetic resin pipe C on the pedestal 11 is designed to be able to catch up with the previous synthetic resin pipe C.

When the synthetic resin pipe C on the pedestal 11 is extruded by the extrusion device 12, the other fitting part 143 of the socket molding connecting member 14 inserted into the front end of the pipe C is guided to the chamfered part 146. Synthetic resin pipe C moving forward as if
Fits easily into the rear end of the Then, as the extrusion device 12 continues to extrude the synthetic resin pipe C on the pedestal 11, the fitting part 142 of the connecting member 14 for socket molding goes deeper into the previous synthetic resin pipe C, and the fitting part 142 The frictional force between the liquid pipe C and the inner surface of the liquid pipe C gradually increases. Along with this, the rotational movement of the previous synthetic resin pipe C is transmitted to the synthetic resin pipe C on the pedestal 11 via this socket molding connecting member 14, and the synthetic resin pipe C on the pedestal 11 also begins to rotate. . At the same time, the guide rollers 113 of the pedestal 11 fall down and separate from the synthetic resin pipe C, as described above. Furthermore, when the extrusion device 12 continues to push the synthetic resin pipe C rotating on the pedestal 11, the fitting part 142 of the connection member 14 for socket molding is completely inserted into the rear end of the previous synthetic resin pipe C. Get stuck in. Now, the pipe axes of the resynthetic resin pipes C2C are aligned, and the pipe ends of the previous synthetic resin pipes C are in contact with the end surface of the socket molding part 141 of the socket and molding connecting member 14, and the two The connection of the synthetic resin pipe C1C is completed. Thereafter, the extrusion device 12 moves the synthetic resin pipes C on the pedestal 11 so that the fitting parts 142 and 143 of the connecting member 14 for socket molding do not come off unexpectedly from each synthetic resin pipe C2C. Keep pushing until the front end reaches the feeder 13.

When the synthetic resin pipe C on the pedestal 11 reaches the delivery device 13, the extrusion device 12 returns the extrusion plate 127 to its original position. When the synthetic resin pipe C leaves the pedestal 11, the stopper of the pipe guide rail 61 is released again, and this time the synthetic resin pipe C, with the connecting member 15 for insertion molding inserted into the front end, is placed on the pedestal 11. sent to the top. The connection process between the connecting member 15 for socket molding and the synthetic resin pipe C passing forward is performed in the same manner as in the case of the connecting member 14 for socket molding described above, and the synthetic resin pipes C... are connected alternately through the connection members 14 for socket forming and the connection members 15 for inlet forming, and as a result, the core pipe is continuously manufactured.

The core tube manufactured by the core tube manufacturing means 1 as described above is sent to the raw tube manufacturing means 2. In the raw pipe manufacturing means 2, the surface treatment machine 21 first performs a surface treatment such as sanding on the outer surface of the core pipe.

In addition, the core pipe includes a concave groove 144 formed in the socket molding part 141 of the socket molding connecting member 14 .
A gap V formed at the connecting portion of the synthetic resin pipe C by the collar portion 155 of the connecting member 15 for insertion molding.
. . , these grooves 144 . . . and gaps 1. It is better to smooth the surface of the core pipe by filling it with an appropriate filler 7.By doing this, when the outer layer forming material 20 is wound later, the edge of the outer layer forming material 20 will be smooth. Above groove 1
It is possible to prevent the winding from becoming disordered due to the winding being caught in the 44 or the gap (3). Furthermore, during cutting in the final process, the cutting blade 41 receives resistance from the filler 7 and becomes difficult to reach the connection member 14 for socket molding and the connection member 15 for socket molding, and these connection members 14 and 15 are cut. It is also possible to prevent damage caused by the blade 41.

The surface-treated core tube is wrapped around the outer layer constituent material winding part 20.
Here, an outer layer constituent material layer is formed on the outer peripheral surface. In this embodiment, as described above, since the outer layer constituent material winding section 22 is provided with the filler filling unit 24 and the FRP winding unit 25, the outer circumferential surface of the core tube is
Two layers of filler 241 and FRP 253 are formed. These filler 241, nonwoven fabric 243, and FRP 25
3, because the core tube is always moving forward while rotating at a constant speed, the core tube is wound spirally at a constant pitch from beginning to end, and the outer peripheral surface of the core tube has a constant thickness. The outer layer constituting material layer is continuously formed.

After the outer layer constituent material layer is formed in this way, the core tube advances while rotating inside the curing furnace 26, during which the outer layer constituent material layer is cured and becomes the resin composite master tube E.

The resin composite raw tube E produced as described above is taken up while being rotated by the raw tube take-up means 3 and sent to the next cutting means 4.

The cutting means 4 waits at a predetermined position for the resin composite raw tube E sent out from the raw tube withdrawal means 3, and the connecting portion of the synthetic resin tube C..., which is the cutting point, comes to the position of the cutting blade 41. At the same time, it starts moving in the same direction as the traveling direction of the original tube E. Since the length of the synthetic resin pipe C and the advancing speed of the raw pipe E are constant, the timing to start this movement can be easily determined based on these values. and,
The cutting means 4 moves at the same speed as the traveling speed of the resin composite original tube E and cuts the original tube E at the above-mentioned connection site.

When the cutting is completed, the cutting means 4 returns to its original position,
Prepare for the next cut. Here, this cutting means 4 cuts only the outer layer constituent material layer of the resin composite master tube E, and does not cut the connecting member 14 for socket molding and the connecting member 15 for socket molding inside the master tube E, so The resin composite tube F obtained by this cutting is connected to the front end of the original tube E via the connecting member 14 for socket molding or the connecting member 15 for socket molding.

Therefore, each time the above-mentioned cutting is completed, the resin composite tube F is pulled and separated from the resin composite tube E, and the resin composite tube F is separated from the resin composite tube E.
The connection member 14 for socket molding or the connection member 15 for socket molding remaining at the tip of the resin composite tube F or the rear end of the resin composite tube F is removed.

The separated resin composite pipe F is carried to a predetermined location by the pipe transfer rail 62, and the removed connection member 14 for socket molding and connection member 15 for insertion molding are returned to their initial positions and used repeatedly.

In the manner described above, a resin composite pipe with a socket of a fixed length in which the thickness of the outer layer-constituting material layer is uniform over the entire length is continuously manufactured.

In addition, in the above-mentioned example, since the connection member 14 for socket molding and the connection member 15 for socket molding are used alternately, the resin composite pipe with a socket to be manufactured has a socket part at the negative end. However, when manufacturing a resin composite pipe with sockets having sockets at both ends, it is sufficient to use only the socket-molding connecting member 14 without using the socket-molding connecting member 15 at all. .

FIG. 14 is a sectional view showing the state of connection between the resin composite pipes with sockets manufactured by the above method, and the socket part 9 and the insertion part 8 are connected by bonding the outer layer constituent material layers 20 together. has been done.

Next, an embodiment of the method for manufacturing a resin composite pipe with a socket according to claim 3 of the present invention will be described.

Note that this manufacturing method differs from the manufacturing method according to claim 2 described above only in the connecting member for socket molding and the connecting member for socket molding that are used, so the differences will be mainly described in detail. Other points will be omitted. Further, the same components as those shown in the above embodiments are given the same reference numerals.

First, the structure of the connection member 16 for socket molding will be explained.

This connection member 16 for socket molding is provided with minute stoppers 167..., 168... for abutting against the end surfaces of the synthetic resin pipes C and securing a gap S immediately before the ends of the pipes. The structure is the same as that of the connecting member 14 for socket molding described in the previous embodiment, except for the following points. That is, FIG. 17 and 1
As shown in FIG. 8, it is molded into a substantially cylindrical shape from a synthetic resin material, and a socket molded part 161 is formed in the central part in the axial direction, and one synthetic resin pipe C is formed at both ends of this socket molded part 161. A fitting part 162 to be fitted into the end of the other synthetic resin pipe C, and a fitting part 163 to be fitted to the end of the other synthetic resin pipe C are formed, respectively. Further, a groove 164 is formed in the center of the socket molding part 161 over the entire circumference. The minute stoppers 167 . . . , 168 . These minute stoppers 167..., 168...
．． 61, in other words, a dimension corresponding to the thickness of the outer layer constituent material covering between the ends of the synthetic resin pipe C. be done. In addition, the height sufficiently prevents the end surfaces of the synthetic resin pipe C from coming into contact with the respective end surfaces of the socket molded part 161, and prevents the end surfaces of the synthetic resin pipe C from being covered with the outer layer constituent material 20. The height is set to a level that does not interfere with the Such minute stoppers 167... 168... are provided at equal intervals over a plurality of locations (four locations in the illustrated example), but if the above-mentioned gaps S, S can be sufficiently secured. , one location is sufficient. Incidentally, the smaller the number of the tubes provided, the less the risk of preventing the tube end surface of the synthetic resin tube C from being covered with the outer layer constituent material 20.

Next, the connection member 17 for molding the socket will be explained.

This connecting member 17 for insertion molding does not have the above-mentioned flange 155, but instead has a concave groove 175 formed all around the boundary between the two fitting parts 171 and 172, and the synthetic resin pipe C. Minute stoppers 176..., 177... for abutting against the end face and securing a gap W just before the pipe end face.
It has the same structure as the connection member 15 for insert molding described in the previous embodiment, except that * is provided. That is,
As shown in FIGS. 20 and 21, it is formed into a substantially cylindrical shape from a synthetic resin material, and one end is a fitting part 171 that is fitted into the end of one synthetic resin pipe C, and the other end is a fitting part 171 that is fitted into the end of one synthetic resin pipe C. A fitting part 172 is fitted into the end of the resin pipe C, and a groove 175 is formed along the entire circumference at the boundary between these fitting parts 171 and 172. This groove 175 is formed by the cutting blade 41 when cutting and separating the resin composite original tube E into a fixed length resin composite tube F with a socket in the final process.
This is to prevent the connecting member 17 itself from being damaged. Therefore, the width of the groove 175 needs to be thicker than the thickness of the cutting blade 41. Further, the depth of this groove 175 needs to be such that contact with the cutting blade 41 can be avoided.

Next, a manufacturing method using the connection member 16 for socket molding and the connection member 17 for socket molding described above will be described.

First, the synthetic resin pipe B is continuously produced by the pipe making machine 51 of the synthetic resin pipe making apparatus 5, and is sequentially cut into prescribed dimensions by the automatic cutting machine 52. At one end (the right end in the figure) of the synthetic resin pipe C of a fixed length made in this way,
A connecting member 16 for socket molding and a connecting member 17 for socket molding are connected to a certain synthetic resin pipe C.
, and the next synthetic resin tube C is sequentially and alternately inserted with the connecting member 17 for molding the insertion opening. In this way...
The synthetic resin pipe C, in which the connecting member 16 for socket molding or the connecting member 17 for spout molding is inserted at the end thereof, is guided by the pipe guide rail 61 and sequentially sent onto the frame 11 of the core tube manufacturing means 1. It will be done.

When the synthetic resin pipe C is fed onto the frame Il, the extrusion device 12 moves the synthetic resin pipe C as in the case of the above-mentioned embodiment.
is pushed out toward the sending machine 13.

A connecting member 17 for socket molding is inserted into the front end of the synthetic resin pipe C.

The synthetic resin pipe C extruded from the pedestal 11 by the extrusion device 12 is sent forward by the delivery device 13 while being rotated around the tube axis. Synthetic resin pipe C is the feeder 1
3, the synthetic resin pipe C
There is no need to keep pushing the extruder 1 from behind.
The second extrusion tool 125 returns to the initial position. When the synthetic resin pipe C is completely separated from the pedestal 11, the stopper at the tip of the pipe guide rail 61 is released, and the synthetic resin pipe C with the connecting member 17 for molding inserted into the front end of the synthetic resin pipe C is released. Pipe C is fed onto pedestal ll.

Subsequently, the extrusion device 12 extrudes the synthetic resin pipe C on the pedestal 11, and the connecting member 17 for molding the insertion opening is inserted into the tip of the synthetic resin pipe C.
is inserted into the rear end of the synthetic resin pipe C being sent out by the sending device 13, and the synthetic resin pipes C9C are connected to each other.

Similarly, a synthetic resin pipe C having a socket-molding connecting member 16 inserted into the front end, and a socket-molding connecting member 1 inserted into the front end.
The synthetic resin tubes C into which the tubes 7 are inserted are connected one after another in an alternating manner, and thereby the core tube is continuously manufactured.

In addition, the core pipe includes a concave groove 164 formed in the socket forming part 161 of the socket forming connecting member 16...
Since the connecting member 17 for insertion molding has the concave grooves 175..., these concave grooves 164 and 175 can be formed as shown in FIGS. 19 and 17 before or after the surface treatment. 22nd
As shown in the figure, it is preferable to smooth the surface of the core pipe by filling it with an appropriate filler 7. By doing so, it is possible to prevent the edges of the outer layer forming material 20 from getting caught in the grooves 164 and 175 and causing irregular winding when the outer layer forming material 20 is wound later. Furthermore, during cutting in the final process, the cutting blade 41 receives resistance from the filler 7 and becomes difficult to reach the connecting member 16 for socket molding and the connecting member 17 for socket molding, and these connecting members 14.1
5 can also be prevented from being damaged by the cutting blade 41.

The core tube manufactured by the core tube manufacturing means 1 as described above is sent to the raw tube manufacturing means 2, and as in the above embodiment, an outer layer constituent material layer is formed on the outer peripheral surface and a resin composite is formed. Original tube E
It is said that Here, the outer layer constituent material 20 is
6.17 minute stopper 167, i68, 176.17
7, a gap S is secured immediately in front of the end surface of the synthetic resin pipe C.

It also goes into W. As a result, synthetic resin pipe C...
The end surface of the tube is covered with the outer layer constituent material 20.

The resin composite raw tube E coming out of the raw tube manufacturing means 2 is rotated and taken over by the raw tube taking-off means 3 and sent to the next cutting means 4.

The cutting means 4 waits at a predetermined position for the resin composite raw tube E sent out from the raw tube withdrawal means 3, and the connecting portion of the synthetic resin tube C..., which is the cutting point, comes to the position of the cutting blade 41. At the same time, it starts moving in the same direction as the traveling direction of the original tube E. Then, the cutting means 4 cuts the raw resin tube E at the connecting portion while moving at the same speed as the traveling speed of the resin composite raw tube E.

When the cutting is completed, the cutting means 4 returns to its original position,
Prepare for the next cut. Here, this cutting means 4 cuts only the outer WJ constituent material layer of the resin composite master tube E, and cuts the connecting member 16 for socket molding and the connecting member 17 for socket molding inside the master tube E.
Since the resin composite tube F obtained by this cutting is not cut until then, the resin composite tube F obtained by this cutting is connected to the front end of the original tube E via the connecting member 1q for socket molding or the connecting member 17 for socket molding.

Therefore, each time the above-mentioned cutting is completed, the resin composite tube F is pulled and separated from the resin composite tube E, and the connecting member for socket forming that remains at the tip of the source tube E or the rear end of the resin composite tube F. 16 or the connection member 17 for molding the insertion hole is removed. The separated resin composite pipe F is carried to a predetermined location by the pipe transfer rail 62, and the removed connection member 16 for socket molding and connection member 17 for insertion molding are returned to the workbench 63 and used repeatedly.

The resin composite pipe with a socket manufactured in the above manner has a regular length, the thickness of the outer layer is uniform over the entire length, and the synthetic resin pipe C facing into the socket 9 has a uniform thickness. The end face 91 is covered with the outer layer constituent material 20, and the end face 81 of the synthetic resin C tube in the insertion port 8 is covered with the outer layer constituent material 2.
It is coated with 0.

In addition, in the above-mentioned embodiment, since the connection member 16 for socket molding and the connection member 17 for socket molding are used alternately, the resin composite pipe with a socket to be manufactured has a socket at the negative end. However, when manufacturing a resin composite pipe with sockets having sockets at both ends, it is sufficient to use only the socket-molding connecting member 16 without using the socket-molding connecting member 17 at all. .

In addition, in any of the above manufacturing methods, the connection member 14.16 for socket molding and the connection member 15.17 for inlet molding are inserted into the front end of the synthetic resin pipe C in advance before the mount 11. However, it is also possible to feed these connecting members 14 to 17 between the pedestal 11 and the feeder 13, and insert them between the synthetic resin pipes C2C located in front and rear by the extrusion operation of the extrusion device 12. good. Further, although the work of inserting the connecting members 14 to 17 may be done manually, it is more efficient to automate the work using an appropriate device.

(Effects of the Invention) As explained above, the insertion and connection structure for the resin composite pipe according to the present invention has excellent connection strength and watertightness. Therefore, it can withstand harsh environments such as underground.

Further, according to the method for manufacturing a resin composite pipe with a socket according to the present invention, the thickness of the outer layer constituent material layer such as FRP is uniform over the entire length of the pipe, and the resin composite pipe with a socket of a fixed length can be manufactured efficiently. Can be easily manufactured continuously. Therefore, productivity can be dramatically improved compared to conventional manufacturing methods.

Furthermore, according to the manufacturing method according to claim 3, the length of the synthetic resin pipe is uniform, and the thickness of the outer layer material layer is uniform over the entire length, and the end surface of the synthetic resin pipe facing into the socket is made of the outer layer material layer. It is possible to efficiently and continuously manufacture a resin composite tube with a socket, in which the end surface of the synthetic resin tube at the insertion port is coated with the outer layer constituent material. and,
It can contribute to implementation of the connection structure described above.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a socket-insertion connection structure for a resin composite pipe according to the present invention, and FIGS. 2 to 15 are a method for manufacturing a resin composite pipe with a socket according to claim 2 of the present invention. 2 is a schematic diagram showing the manufacturing process and manufacturing equipment, FIG. 3 is a partially omitted front view showing the extrusion device and pedestal of the core tube manufacturing means, and FIG. 4 is a right side view of the same. Fig. 5 is a schematic front view showing the configuration of the delivery machine of the core tube manufacturing means, Fig. 6 is a left side view of the same, Fig. 7 is a perspective view showing an embodiment of the connecting member for socket forming, and Fig. 8 9 is a sectional view taken along the line I-1 in FIG. 7, FIG.
The figures are a sectional view taken along the line ■-■ in FIG. 9, FIG. 11 is a perspective view showing another embodiment of the connecting member for insert molding, FIG. 12 is a sectional view taken along the line ■-■ in FIG. 11, and FIG. The figure is a cross-sectional view showing the connection part of the synthetic resin pipe in the resin composite original pipe and the state of use of the connection member for socket molding, and Figure 14 shows the connection state of the resin composite pipe with a socket manufactured by the method of the present invention. A sectional view, FIG. 15 is a sectional view showing the connecting part of the synthetic resin pipe in the resin composite master tube and the state of use of the connecting member for insert molding, and FIG. 16 explains the function of the flange of the connecting member for insert molding. The sectional views shown in FIGS. 17 to 22 correspond to claim 3 of the present invention.
FIG. 17 is a perspective view showing an example of a connection member for socket molding having a minute stopper, and FIG. 18 is an IV in FIG. 17.
-IV line sectional view, Fig. 19 is a sectional view showing the connecting portion of the synthetic resin pipe in the resin composite master pipe and the usage state of the connecting member for socket molding, and Fig. 20 is the connecting member for socket molding having a minute stopper. FIG. 21 is a cross-sectional view taken along the line V-V in FIG. 20, FIG. 22 is a cross-sectional view showing the connecting portion of the synthetic resin pipe in the resin composite master tube and the state of use of the connecting member for insertion molding, FIG. 23 is a front view for explaining a conventional method for manufacturing a resin composite pipe. 1... Core tube manufacturing means 11... Frame 12... Extrusion device 13...
Sending machine 14.16... Connecting member for socket molding 141.161... Socket forming part 142.143... Fitting part 162.163... Fitting part 144.164... Concave groove 145. 146... Chamfered part 165.166... Chamfered part 167.168... Minute stopper 15.17... Connecting member for insertion molding 151.152... Fitting part 171.172... Fitting part 153.154... Chamfered portion 173.174... Chamfered portion 155... Crocodile portion 175... Concave groove 2... Original tube manufacturing means 22... Outer layer constituent material winding portion 26... Curing furnace 3...Original tube take-up means 4...Cutting means 41...Cutting blade 5...Synthetic resin pipe making device 51...Pipe making machine 61...Tube guide rail 62... Pipe transfer rail 63...Workbench 7...Filling material 8...Inlet part 81...End face 9...Socket part 9I...End face A...Band-shaped body C...Standard Length synthetic resin pipe E...Resin composite original pipe F...Resin composite pipe with socket Fl...Resin composite pipe with socket F2...Resin composite pipe 52...Automatic cutting machine B...・Synthetic resin pipe D...Core tube Figure 1 Patent applicant Hiroshi Sekisui Chemical Co., Ltd. Representative Hiroshi 1) Figure 35 Figure 6 Figure 110 Figure 12 Rabbit slip 7 Figure 9 No. 1010 No. 150 @160 17th [ 18th = Liu Fig. 19 Fig. 22 Fig. 175 T77 820 Fig. 210 No. 230

Claims (1)

[Scope of Claims] 1) A resin composite pipe with a socket, in which an outer constituent material layer is formed on the outer peripheral surface of a synthetic resin pipe serving as a core material, and a socket portion is provided at at least one end, and a synthetic resin pipe serving as a core material. In receiving and joining a resin composite pipe with an outer layer constituent material layer formed on the outer peripheral surface of the pipe and having a socket at at least one end, the socket part of the resin composite pipe has a socket made of the outer layer constituent material. At the same time, the tube end surface of the core material facing into the socket part is coated with an outer layer constituent material, while the tube end surface of the core material in the socket part is coated with an outer layer constituent material. The insertion part of the resin composite pipe thus constructed is inserted into the socket part of the resin composite pipe with a socket, and the outer layer constituent materials covering the pipe end surfaces of each core material collide with each other. What is claimed is: 1. A socket-insertion connection structure for a resin composite pipe, characterized in that these outer layer constituent materials and the inner circumferential surface of the socket part and the outer circumferential surface of the socket part are fixed with an adhesive. 2) A synthetic resin pipe of a fixed length can be rotated around its pipe axis and moved forward along the pipe axis, and the rotational movement and forward movement of this synthetic resin pipe can be transmitted, and the axially central part A synthetic resin pipe of the same standard length as the pipe is connected to the rear end of the synthetic resin pipe through a socket molding connecting member having a socket molding part, and then the rear end of the connected synthetic resin pipe is A synthetic resin pipe of the same standard length as the pipe is connected to the section through a connecting member for molding the socket, which can transmit the rotational motion and forward motion of the pipe, or again through the connecting member for molding the socket. Similarly, the connecting member for socket molding and the connecting member for insert molding are interposed alternately between synthetic resin pipes of a fixed length, or only the connecting member for socket molding is inserted. a step of sequentially connecting the synthetic resin pipes by interposing the synthetic resin pipes to form a core pipe in which a plurality of synthetic resin pipes are connected and integrated; and a step of moving the synthetic resin pipes forward along the pipe axis while rotating around the pipe axis. A step of winding and laminating an outer layer constituent material around the outer circumferential surface of the core tube to form a resin composite master pipe, and after curing the outer layer constituent material, sequentially cutting the resin composite master pipe at the connecting portions of each of the synthetic resin pipes. A method for producing a resin composite tube, comprising the step of separating the resin composite tubes into regular length resin composite tubes. 3) In the process of forming a core tube, a connection member for socket molding and a connection for socket molding that are provided with a minute stopper that comes into contact with the pipe end surface of the synthetic resin pipe to secure a gap immediately before the pipe end surface. In addition to using the member, in the step of forming the resin composite master pipe, an outer layer constituent material is also introduced into the gap, and the tube end surface of each synthetic resin pipe is covered with the outer layer constituent material. The method for manufacturing the resin composite pipe described.