JP3207297B2 - Fiber reinforced synthetic resin pipe and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced synthetic resin pipe reinforced by reinforcing fibers and a method for producing the same.
More specifically, the present invention relates to a fiber-reinforced synthetic resin tube suitably used for a propulsion method and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a fiber-reinforced synthetic resin pipe used as a sewer pipe. This fiber reinforced synthetic resin tube 30
The fiber reinforced synthetic resin layers 31 and 33 are formed on the inner and outer peripheral sides of the resin mortar layer 32, respectively. Such a fiber-reinforced synthetic resin tube 30 is usually formed by spirally winding a belt-shaped steel band around a rotating mandrel to form a tube, and an inner peripheral fiber-reinforced synthetic resin is formed on the formed tube. It is manufactured by sequentially laminating the layer 31, the resin mortar layer 32, and the fiber-reinforced synthetic resin layer 33 on the outer peripheral side and curing the same, and removing the tube remaining on the inner peripheral side.

In order to bury the fiber-reinforced synthetic resin pipe 30 thus manufactured in the ground, a propulsion method has recently been adopted in which a horizontal shaft is formed and the fiber-reinforced synthetic resin tube is pushed into the horizontal shaft and laid. Is also used. In this propulsion method,
As shown in FIG. 8, the fiber reinforced synthetic resin pipes propelled into the horizontal shaft are connected by collar joints 40 into which the ends of the respective fiber reinforced synthetic resin pipes are inserted (Japanese Utility Model Publication No. 4-10319). Gazette). The collar joint 40 is made of a fiber-reinforced synthetic resin tube 3 for facilitating propulsion in a horizontal shaft.
The outer diameter is equal to 0. For this purpose, each end of the fiber reinforced synthetic resin pipe has its outer periphery cut to form an insertion port so as to be inserted into the collar joint 40.

A fiber reinforced synthetic resin pipe 30 having a slot at each end for a propulsion method is usually manufactured as follows.
As described above, when the fiber reinforced synthetic resin pipe 30 shown in FIG. 5 is manufactured, as shown in FIG. 6, the outer peripheral surface of each end of the fiber reinforced synthetic resin pipe 30 is cut to form an insertion port. Is done. Thereafter, as shown in FIG. 7, a fiber reinforced synthetic resin layer 34 is laminated on the outer peripheral surface of the cutout opening at each end.

[0005] When the insertion port is formed in this way, as shown in FIG. 8, the fiber reinforcement of the insertion port at the rear end of the fiber-reinforced synthetic resin pipe 30 propelled into a horizontal shaft formed underground. An annular seal rubber 41 is fitted to and adhered to the synthetic resin layer 34, and the distal end of the collar joint 42 is fitted into the insertion hole to which the seal rubber 41 is adhered. Then, similarly, a seal rubber 41 is fitted and adhered to the fiber reinforced synthetic resin layer 34 at the insertion port at the distal end of the fiber reinforced synthetic resin pipe 30 which is a subsequent propulsion pipe, and is attached to the rear end of the color joint 42. Mated.

Thus, the fiber reinforced synthetic resin tube 30
When they are connected to each other, a pressing force is applied to the succeeding fiber-reinforced synthetic resin pipe 30 and the fiber-reinforced synthetic resin pipe is propelled into the horizontal shaft together with the preceding fiber-reinforced synthetic resin pipe. A conduit for the resin pipe 30 is laid.

[0007]

In the fiber reinforced synthetic resin tube 30 having openings formed at each end, a fiber reinforced synthetic resin layer 34 is provided on the outer peripheral surface of the insertion opening. The layer 34 is separated from the fiber-reinforced synthetic resin layer 33 provided on the outer peripheral surface of the main body portion other than the insertion opening. For this reason, sufficient compressive strength and impact resistance cannot be obtained at the insertion port, and the insertion port may be broken when propelled into the underground horizontal shaft.

Further, in order to form the insertion opening at each end as described above, after manufacturing the fiber reinforced synthetic resin tube 30 having a constant inner diameter and outer diameter, the outer periphery of each end is cut and inserted. Must be formed, and the fiber reinforced synthetic resin layer 34 must be laminated on the outer peripheral surface thereof, which causes a problem that production efficiency is poor.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a fiber-reinforced synthetic resin pipe which is not likely to be broken when propelled into a horizontal shaft formed underground. It is in. Another object of the present invention is to provide a method for efficiently producing the fiber-reinforced synthetic resin tube.

[0010]

In the fiber reinforced synthetic resin tube of the present invention, the outer diameter is constant, and the inner diameter of each end is larger than the inner diameter of the main body excluding each end. A synthetic resin layer in which a thin-walled receptacle is formed, and each fiber-reinforced synthetic resin layer covering the entire outer circumference and inner circumference of the resin layer, thereby achieving the above object. You.

[0011] The method for producing a fiber-reinforced synthetic resin tube of the present invention comprises the steps of spirally winding a belt-like body around a rotating mandrel to form a tube, and forming the tube at a predetermined pitch on the formed tube. A step of winding a band material to form a straight cylindrical large-diameter core portion having a predetermined axial length, a step of covering the large-diameter core portion and the tubular body with a release film, And a step of sequentially laminating a fiber-reinforced synthetic resin layer, a synthetic resin layer, and a fiber-reinforced synthetic resin layer, whereby the object is achieved.

[0012]

The fiber reinforced synthetic resin pipe of the present invention is propelled and laid in a horizontal shaft formed underground. When the preceding fiber-reinforced synthetic resin pipe is propelled into the horizontal shaft, the insertion port of the color joint is inserted into the thin-walled receptacle formed at the rear end and having an increased inner diameter, and the rear end of the color joint is inserted. A receptacle formed at the tip of a subsequent fiber-reinforced synthetic resin tube is fitted and connected to the insertion port. The receiving port of the fiber reinforced synthetic resin tube is continuously covered by a fiber reinforced synthetic resin layer covering the inner peripheral surface of the main body, and the outer peripheral surface of the receiving port is also covered by the fiber reinforced synthetic resin layer over the entire circumference. Due to being covered, the receptacle has excellent compressive strength and impact resistance.

In the method for manufacturing a fiber-reinforced synthetic resin tube according to the present invention, a large-diameter core portion is formed by winding a band material around a tube formed on a mandrel, and the fiber-reinforced synthetic resin tube is formed on the tube and the large-diameter core portion. Each resin layer constituting the resin tube is laminated. The synthetic resin layer laminated on the tubular body and the fiber-reinforced synthetic resin layer laminated on the large-diameter core portion is thinned by the large-diameter core portion, and the thinned portion is defined as the axial direction. By cutting in a direction orthogonal to the direction, a fiber-reinforced synthetic resin pipe having a receiving port formed at an end is manufactured.

[0014]

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

FIG. 1 is a longitudinal sectional view showing a fiber-reinforced synthetic resin mortar tube which is an example of a fiber-reinforced synthetic resin tube for a propulsion method according to the present invention. The fiber reinforced synthetic resin tube 10 is formed by laminating fiber reinforced synthetic resin layers 11 and 13 each having a certain thickness on the inner and outer peripheral surfaces of a resin mortar layer 12 which is a synthetic resin layer.

The fiber reinforced synthetic resin tube 10 has a constant outer diameter, and a receiving port 14 having a larger inner diameter and a reduced thickness is formed at each end. Each of the receiving ports 14 is connected to the main body 16 via a tapered portion 15 whose inner diameter decreases gradually toward the main body 16 except for the receiving port 14 at each end of the fiber reinforced synthetic resin tube 10.

FIG. 2 is a schematic view showing an example of a method for manufacturing the fiber-reinforced synthetic resin tube 10 having such a configuration. In this manufacturing method, a mandrel 1 rotated in a direction indicated by an arrow A is used. The mandrel 1 has, for example, a width of 8
A steel band 3 having a band shape of 0 mm is spirally wound to form a tube 2 on the outer peripheral surface of the mandrel 1. The tube 2 formed on the mandrel 1 is moved in the direction indicated by the arrow B with the rotation of the mandrel 1.

When the tubular body 2 made of the steel band 3 is formed on the mandrel 1 in this manner, a band 6 made of urethane rubber having a predetermined length as shown in FIGS. 3 (a) and 3 (b).
Is wound over twice the axial length of the receiving port 14 and the tapered portion 15 of the fiber-reinforced synthetic resin tube 10 to be formed, and the large-diameter core portion 5 is formed. When this band material 6 is wound around the tubular body 2, each edge is respectively in the longitudinal direction such that each end face of the large diameter core portion 5 is orthogonal to the axis of the tubular body 2. Slant and parallel to each other. The ends along the respective edges are tapered, and the ends of the large-diameter core portion 5 to be formed are tapered. The band 6 has a width smaller than the width of the steel band 3 constituting the tube 2 so that the large-diameter core portion 5 is accurately formed at a predetermined axial length. For example, the width dimension of the steel band 3 is 80 mm
In this case, two strips 6 each having a width of 45 mm are used.

The large-diameter core portion 5 formed by the strip 6
On the outer peripheral surface of the tube body 2 formed on the mandrel 1, a tube is formed at a pitch P equal to the length of the fiber-reinforced synthetic resin tube 10 to be formed.

As described above, the large-diameter core portion 5 having a predetermined axial length and a predetermined axial length is formed on the tubular body 2 at a predetermined pitch P.
Is formed, the strip-shaped release film 7 is spirally wound and laminated so as to cover the entirety of the tubular body 2 and the large-diameter core portion 5. The release film 7 covers the gap between the adjacent side edges of the strip 6 constituting the large-diameter core 5.

When the release film 7 is wound, the fiber reinforced synthetic resin layer 11, the resin mortar layer 12, and the inner peripheral side constituting the fiber reinforced synthetic resin tube 10 to be formed are formed on the release film 7. And the fiber-reinforced synthetic resin layer 13 on the outer peripheral side
The layers are sequentially stacked over the entire circumference.

The inner and outer fiber reinforced synthetic resin layers 11 and 13 constituting the inner circumferential portion of the fiber reinforced synthetic resin tube 10 are made of, for example, a long fiber made of an unsaturated polyester resin containing 1% of a curing agent. It is configured by being impregnated in a glass fiber shape.

Since the large-diameter core portion 5 is covered with the release film 7, the fiber-reinforced synthetic resin layer 1
1 does not have a risk of entering the gap between the strips 6 forming the large-diameter core portion 5. The resin mortar layer 12 laminated on the fiber-reinforced synthetic resin layer 11 is laminated so that the outer diameter of the outer peripheral surface is constant. It is thinner than the part.

Thus, the fiber-reinforced synthetic resin layer 11, the resin mortar layer 12, and the fiber-reinforced synthetic resin layer 13 are sequentially laminated on the tube 2 and the large-diameter core portion 5 provided on the mandrel 1. Then, the tube 2 is sequentially moved in the axial direction by the rotation of the mandrel 1, and the laminated body is introduced into the curing furnace together with the tube 2 and heated. Thereby, each resin layer is cured.

A release film 7 and a fiber-reinforced synthetic resin tube 10 are laminated on the tube 2 and the large-diameter core portion 5 carried out of the curing furnace. After the tube 2 in the fiber-reinforced synthetic resin tube 10 is disassembled and removed by the steel belt 3 constituting the tube 2, the urethane rubber band 6 constituting the large-diameter core portion 5 is removed. The release film 7 is also removed, and the fiber reinforced synthetic resin tube 10 is removed.
Is cut at a portion corresponding to the central portion of the large-diameter core portion 5 in the axial direction. Thus, a fiber-reinforced synthetic resin tube 10 having a predetermined length and having a thin receiving port 14 at each end, as shown in FIG. 1, is manufactured.

The fiber reinforced synthetic resin pipe 10 thus manufactured is laid underground by a propulsion method. When the fiber reinforced synthetic resin pipe 10 is laid in the ground by this propulsion method, the preceding fiber reinforced synthetic resin pipe 10 and the following fiber reinforced synthetic resin pipe 10 are connected by the collar joint 20 shown in FIG. Is done. The collar joint 20 has a cylindrical main body 21 whose respective ends are inserted into the receptacles 14 of the respective fiber-reinforced synthetic resin tubes 10, and is externally fitted to each end of the main body 21, and is bonded by an adhesive. It has a pair of annular seal rubbers 22 bonded together.

[0027] The above-mentioned collar joint 20 is formed by inserting the preceding fiber-reinforced synthetic resin pipe 10 into a horizontal shaft formed in the ground except for the receptacle 14 at the rear end, and then inserting the pipe 14 at the rear end. One end is inserted into the inside. As a result, the seal rubber 22 fitted to one end of the main body 21 of the collar joint 20 is brought into a state of being pressed against the inner peripheral surface of the receptacle 14. And the preceding fiber reinforced synthetic resin pipe 1
The fitting 14 provided at the leading end of the subsequent fiber-reinforced synthetic resin tube 10 is fitted to the rear end of the collar joint 20 extending from the fitting 14 of the color fitting 20. The seal rubber 22 at the rear end is pressed against the rear end. In such a state, the subsequent fiber-reinforced synthetic resin pipe 10
Is pushed into the horizontal shaft formed in the ground and propelled in the horizontal shaft, and thereafter, the same operation is repeated, and the pipeline of the fiber-reinforced synthetic resin pipe 10 is laid in the ground.

[0028]

As described above, in the fiber-reinforced synthetic resin pipe of the present invention, the thin-walled receiving port formed at each end portion is covered with the fiber-reinforced synthetic resin layer continuous on the entire inner peripheral surface. In addition, the compressive strength and impact resistance of the receptacle are significantly improved. Further, the method for producing a fiber-reinforced synthetic resin tube of the present invention,
On the tube formed on the mandrel, a large-diameter core portion serving as each receiving port is formed by winding a band material, and the receiving port with a thin synthetic resin layer can be easily manufactured without cutting or the like. And production efficiency is significantly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a fiber-reinforced synthetic resin tube of the present invention.

FIG. 2 is a partially cutaway schematic view showing an example of a method for producing the fiber reinforced synthetic resin tube.

FIG. 3 (a) is a plan view of a band used in the manufacturing method, and FIG. 3 (b) is a cross section thereof.

FIG. 4 is a cross-sectional view of a connection portion between fiber-reinforced synthetic resin pipes in a propulsion method using the fiber-reinforced synthetic resin pipe.

FIG. 5 is a partially broken side view showing an example of a conventional fiber-reinforced synthetic resin tube.

FIG. 6 is a partially broken side view showing a process for forming insertion openings at each end of the fiber reinforced synthetic resin pipe.

FIG. 7 is a partially broken side view showing a process for forming insertion openings at each end of the fiber-reinforced synthetic resin tube.

FIG. 8 is a cross-sectional view of a connection portion between fiber-reinforced synthetic resin pipes in a propulsion method using a fiber-reinforced synthetic resin pipe having an insertion opening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mandrel 2 Tube 3 Steel belt 5 Large diameter core part 6 Strip 7 Release film 10 Fiber reinforced synthetic resin tube 11 Fiber reinforced synthetic resin layer 12 Resin mortar layer 13 Fiber reinforced synthetic resin layer

Claims (2)

(57) [Claims] 1. A synthetic resin layer having a thin outer wall having a constant outer diameter and an inner diameter at each end larger than an inner diameter of a main body excluding each end thereof; And a fiber-reinforced synthetic resin layer covering the outer and inner peripheral surfaces of the layer over the entire circumference, respectively. 2. A step of forming a tube by spirally winding a band around a rotating mandrel, and winding a band at a predetermined pitch on the formed tube to form a tube having a predetermined axial length. A step of forming a large-diameter core part having a right cylindrical shape; a step of covering the large-diameter core part and the tubular body with a release film; and a fiber-reinforced synthetic resin layer, a synthetic resin layer, and a fiber reinforcement on the release film. A step of sequentially laminating a synthetic resin layer;