JPH0978998A - Tension structure member, manufacture of tension structure member, and forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture ground reinforcing lock bolts of optional length at a construction site where the lock bolts are constructed. SOLUTION: Resin impregnated fiber prepreg wound around a bobbin is mounted on a rod forming device 20 in a field position. A plurality of resin impregnated fiber pepreg are bundled and passed through in a heater 22 so as to be heated and put in a softened and fused state. After passing through a heater 23, the prepreg is passed through a metal mold 24 and drawn by a rod drawing grip device 28 to form a straight rod R made of fiber reinforced thermoplastic resin. At the time of passing the rod R through a cooling process, uneven shape is formed on the surface of the rod R, and after passing through the rod drawing grip device 28, the rod is cut into specified length to continuously manufacture tension structure members.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tensile structure member, a method of manufacturing the tensile structure member, and a molding apparatus, and is particularly applicable to a lock bolt and an anchor bolt at a tunnel excavation site or a slope stabilization site. The present invention relates to a tensile structural member made of a fiber-reinforced resin rod having any arbitrary length, and a manufacturing method and a molding device capable of continuously molding the tensile structural member at the site position.

[0002]

2. Description of the Related Art Of the rock bolts for supporting the ground of mountain tunnels and the anchor bolts for slope stabilization,
For those that are planned to be removed due to the progress of excavation later, rock bolts made of fiber reinforced thermosetting plastic (hereinafter, referred to as FRP) are used instead of the conventional steel lock bolts made of deformed steel bars and the like. There are many cases. This type of FRP lock bolt is a straight rod-shaped tensile structure member in which glass fiber reinforced plastic is wound around a resin core material such as styrofoam to obtain a predetermined tensile strength. Since the FRP lock bolt is extremely lightweight, it can be easily carried into the field and has excellent corrosion resistance, so it can be stored at the site more easily than steel rock bolts. On the other hand, since it is lightweight in terms of construction, it is easy to build, and at the same time as excavating the ground with an excavator, the rod part in the ground is cut to an appropriate size, so that the face mirror surface of the tunnel is supported. Bolts and anchor bolts for temporary earth retaining walls, which are expected to be widened and excavated, are now used in parts that are to be excavated by post-construction, and are being used in reinforced parts that are removed due to excavation. It was

As the form of the FRP lock bolt that has been developed so far, a predetermined bending radius is adopted so that it can be applied to a rod type in consideration of usability similar to a normal steel lock bolt and various rod lengths. There is known a cable type that can be wound into a coil shape and cut into an appropriate length for use.

[0004]

Of these, the rod-type FRP lock bolt is a standard length product that has been cut into a predetermined length in advance, and is of a length suitable for the rod length to be placed on site. It is designed to be used. Therefore, with anchor bolts with deep support layers,
It is necessary to connect rods on the way to secure a predetermined anchor length. However, the FRP lock bolt can be expected to have a tensile strength higher than that of steel material in the general portion, but the rate of strength reduction is large in a portion having a cross-section processed such as a screw portion. For this reason,
When it is used as a long bolt having a connection, there is a problem that the bolt proof stress per one must be reduced before use.

Further, since the cable type is originally formed in the shape of a straight rod, even if it is wound into a coil on a reel or the like to be commercialized, an urging force in the unwinding direction that always returns to a straight line acts. Since it does not have the flexibility (flexibility) of a normal steel stranded cable, it is extremely troublesome to handle it on site. In addition, with solid rods like the conventional one, when cement milk is injected into the rod insertion hole of the natural ground, it is not possible to confirm whether the cement milk has been filled to the inside of the hole securely, so it is firmly fixed in the natural ground. In some cases it was not possible.

Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art and to manufacture it at the site where a lock bolt or the like is constructed, and to cut it to a predetermined length and use it as a lock bolt or the like. Another object of the present invention is to provide a manufacturing method and a molding device that enable continuous molding of the tensile structure member.

[0007]

In order to achieve the above object, the present invention comprises a resin-impregnated fiber prepreg, which is made of a reinforced long fiber material impregnated with a thermoplastic resin, and which is pre-wound with a tensile structural member. Carry in near the site, draw out a plurality of the resin-impregnated fiber prepregs under a predetermined tension to bundle them, and further heat them to soften and melt the thermoplastic resin of the bundled resin-impregnated fiber prepregs, and then heat the gold. A straight rod-shaped rod made of fiber-reinforced thermoplastic resin is molded by passing through the mold, and while the surface of the rod is softened, an uneven shape is formed on the rod surface, and then the rod is subjected to the above-mentioned site. In this case, the desired length is cut and the construction can be performed as it is at the site.

Further, in producing the above-mentioned tensile structural member, a reinforcing long fiber material impregnated with a thermoplastic resin is used,
The pre-wound resin-impregnated fiber prepreg was brought into the vicinity of the site where the tensile structural member is to be constructed, and a plurality of the resin-impregnated fiber prepregs were pulled out and focused under a predetermined tension, and further heated and then focused. A thermoplastic resin of the resin-impregnated fiber prepreg is softened and melted, and a rod made of a straight rod-shaped fiber-reinforced thermoplastic resin is drawn by passing through the mold after heating, and while the rod surface is softened, An uneven shape was formed on the surface of the rod, and then the rod was cut into the desired rod length at the site to continuously produce the tensile structural member to be constructed at the site.

In order to realize the above rod manufacturing method, as a rod forming apparatus, a rack that is movably installed at a work position near a site where a tensile structure member is installed and that can mount a plurality of bobbins, A focusing guide member for focusing a resin-impregnated fiber prepreg made of a reinforcing long-fiber material impregnated with a thermoplastic resin, drawn out from each bobbin on the rack, and the resin passing through the focusing guide member. Heating means for heating the impregnated fiber prepreg,
A mold for drawing out the resin-impregnated fiber prepreg in a softened and melted state drawn out from the heating means, and a concavo-convex process on the surface of a rod made of a fiber-reinforced thermoplastic resin in a straight rod shape obtained by passing through the mold. And a cooling means for gradually cooling the rod.

Further, in the production of the rod, specifically, a resin-impregnated fiber prepreg made of a reinforcing long fiber material impregnated with a thermoplastic resin is wound around a bobbin in advance, and a tension structural member is applied to the bobbin. It is mounted on the rod forming device installed at a work position near the site, and the resin-impregnated fiber prepreg is pulled out from a plurality of bobbins under a predetermined tension to be focused, and further passed through the heating means to be focused. The thermoplastic resin of the resin-impregnated fiber prepreg is softened and melted, and after passing through the heating means, it is pultrusion-molded by the mold to form a rod-shaped rod made of fiber-reinforced thermoplastic resin, and the surface of the rod is softened. In the meanwhile, the surface processing means forms an uneven shape on the surface of the rod, and thereafter, the rod is cut into the desired rod length at the site, and then at the site. Tensile structural members that are factory in which the continuous production.

At this time, the heating means includes a first heating machine for softening and melting the thermoplastic resin of the resin-impregnated fiber prepreg, and a second heating machine for maintaining the softened and molten state before the pultrusion by a die. In addition, the surface processing means is a roller capable of holding the rod made of the fiber-reinforced thermoplastic resin in the shape of a straight rod, and an uneven shape is formed on the surface of the roller.

The resin-impregnated fiber prepreg is reinforced long fiber material 20 to 400 with respect to 100 parts by weight of the thermoplastic resin.
It is preferably in the form of a resin-impregnated fiber wire or tape which is composed of parts by weight.

The thermoplastic resin is preferably a thermoplastic resin composed of at least one resin selected from polyolefin resins, polyamide resins, polyester resins and polyacetal resins.

It is preferable that the thermoplastic resin is mainly made of polypropylene resin or polyethylene resin as a polyolefin resin. As a result, the tensile structural member can be finished inexpensively and of high quality.

The reinforcing long fiber material is at least one of glass long fiber, long carbon fiber, ceramic long fiber, aramid fiber, steel fiber and polyethylene fiber.
It is preferable to use at least one kind of fiber. As a result, the tensile strength to be exerted by the tensile structure member can be sufficiently secured, and the cross-sectional area of the member can be reduced, so that the weight can be reduced.

The rod made of the fiber reinforced thermoplastic resin is
It is preferably molded into a hollow tube. At this time, the fiber-reinforced thermoplastic resin rod is formed by coating the periphery of a hollow tubular core material extending in the rod longitudinal direction with the resin-impregnated fiber prepreg or by forming a hollow inside the rod longitudinal direction. It is preferable to coat the periphery of a rod piece formed of a plurality of parts with the resin-impregnated fiber prepreg for molding.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for manufacturing a tensile structure member according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram showing a state in which a bobbin placement carriage 10 and a rod molding carriage 20 constituting a rod molding device used in the present invention are connected. The bobbin placement carriage 10 is, as shown in the figure, a rod forming carriage 2
A plurality of bobbins 11 located at the rear of 0 and on which a resin-impregnated fiber prepreg (details will be described later) are wound on the bogie.
Is installed. This bobbin 11 is shown in FIGS.
As shown in (b), the bobbin 11 has a cylindrical shape in which a brim 12 is formed on both sides (in the figure, one is omitted for the sake of explanation), and the support rod 13 is inserted through the core material. A bearing base (not shown) is rotatably supported.

The resin-impregnated fiber prepreg has two typical shapes. The fine wire-shaped resin-impregnated fiber prepreg W has a thin rod shape having a wire diameter of about 1.5 to 2.0 mm, can be wound with a small curvature, and can be wound on a bobbin having a predetermined diameter (FIG. 2). (See (a)). On the other hand, the resin-impregnated fiber prepreg tape T is a flat and continuous flexible tape as shown in an enlarged view in FIG. Therefore, a large amount of resin-impregnated fiber prepreg can be easily wound around the bobbin 11. In this embodiment, the width is set to 10 mm and the thickness is set to 0.25 mm. Here, a method of manufacturing the resin-impregnated fiber prepreg (wire material, tape) will be described with reference to FIG. In the present embodiment, long glass fiber is used as the reinforcing fiber material. The specification of long glass fiber is fiber diameter φ
A glass fiber bundle 31 (corresponding to a count: 575 tex) in which approximately 1600 glass fiber strands of 13 μm are bundled is used. As shown in FIG. 3, the glass fiber bundle 31 of the glass roving 30 wound in a coil shape is bundled by three and passed through the high frequency preheater 32. Then, when the glass fiber bundle 31 is passed through the mold 37 at the tip of the single-screw extruder 33, continuous extrusion molding is performed by the single-screw extruder 33. This single-screw extruder 33 is a known single-screw type extruder, and the molding material 3 charged from the hopper 34 is used.
5 is heated and pressed in an extruder 33 formed of a cylindrical cylinder to be in a softened and molten state, kneaded and conveyed by a screw 36, and extruded into a mold 37. The molding material 35 used in the present embodiment is polypropylene resin. Hopper 3 with a certain amount of polypropylene resin pellets
The glass fiber bundle 31 supplied from No. 4 and passing through the die 37 by the extruder 33 is coated with resin. In the present embodiment, the weight composition ratio of the glass fiber bundle 31 extruded and resin-coated and the polypropylene resin is set to 50:50. This weight composition ratio is such that the glass fiber bundle 31 is 2 times the polypropylene resin 100.
It can be set to 0 to 400. Glass fiber bundle 31
If the ratio is less than 20, the strength of the molded product cannot be sufficiently obtained, and if it exceeds 400, the glass component may be attacked by the alkalinity of the cement, resulting in a problem of durability. Also,
When the prepreg is a tape, it lacks flexibility (flexibility) and cannot be wound as shown in FIG. 2 (b).

The fine wire-shaped resin-impregnated fiber prepreg W can be wound around the bobbin 11 at this stage because a fine wire is obtained when it passes through the mold 37. In order to manufacture the resin-impregnated fiber prepreg tape T, the glass fiber bundle 31 in a resin-coated state is further combined with a pair of cooling press rollers 3
Pass between 8 points. Thus, the fine resin-impregnated fiber prepreg can be shaped into a flat continuous tape shape. This tape can be wound on the bobbin 11 as a resin-impregnated fiber prepreg tape T. The resin-impregnated fiber prepreg tape T manufactured according to the specifications shown in the present embodiment is about 138 kgf per one.
It has been confirmed experimentally that a tensile strength of 1 / piece can be obtained. Therefore, when forming the rod R as a tensile structure member described later, the required number of tapes can be set in consideration of a predetermined safety factor from the tensile proof stress required for the tensile structure member. For example, if the tensile strength P of the tensile structural member is set to P = 10,000 kgf, 73 resin-impregnated fiber prepreg tapes T may be used to mold a rod as one tensile structural member. Therefore, in order to reduce the number of bobbins 11 mounted on the bobbin placement carriage 10 shown in FIG. 1, the number of glass fiber bundles 31 per one resin-impregnated fiber prepreg tape T should be increased. With respect to the resin-impregnated fiber prepreg W, the number of bundles can be similarly calculated. In the following description, an example in which the resin-impregnated fiber prepreg tape T is used is described as an embodiment. However, the resin-impregnated fiber prepreg W can also be manufactured by the same method as the rod described below. It goes without saying that the molding device can be used as it is.

Next, the structure of the rod forming apparatus will be described with reference to FIG. The rod forming carriage 20 has a carriage structure for moving the rod forming apparatus of the present invention to a predetermined position. The configuration will be described below. On the bobbin placement carriage 10 side of the rod molding carriage 20,
A guide ring 21, which is a focusing guide member, is arranged. The guide ring 21 is a guide member provided for focusing the resin-impregnated fiber prepreg tape T led out from the plurality of bobbins 11 mounted on the rack 14 on the connected bobbin placement carriage 10. Guide ring 2
A plurality of the resin-impregnated fiber prepreg tapes 1 are installed coaxially with respect to the extending direction (drawing direction) of the resin-impregnated fiber prepreg tape T. Although two guide rings 21 are shown in FIG. 1, in order to bundle a large number of resin-impregnated fiber prepreg tapes T to a predetermined diameter, a plurality of guide rings each having a guide hole with a gradually decreasing hole diameter are provided. You may make it arrange | position in a column direction.

Further, adjacent to the guide ring 21, a first heater and a second heater as heating means are arranged. In the present embodiment, the high frequency preheater 22 is provided as the first heating device. The high-frequency preheater 22 adjusts the temperature in the furnace during heating to 150 to 30 according to the heat distortion temperature of the molding material used for the resin-impregnated fiber prepreg tape T.
It can be set to a predetermined temperature in the range of 0 ° C. A heating heater 23 as a second heating device is provided adjacent to the next process position of the high frequency preheater 22. This heating heater 2
3 plays a role of holding the resin coating on the surface of the resin-impregnated fiber prepreg tape T that enters the mold 24 in a softened and melted state when the pultrusion molding by the rod molding carriage 20 is performed intermittently.

Further, a plurality of resin-impregnated fiber prepreg tapes T having the surface softened and melted coming out of the heating heater 23 are straight rod-shaped and have a substantially circular cross section (in the present embodiment, a rod diameter φ20 mm is used to obtain The type is designed.)
A mold 24 for molding is coaxially arranged.
A heater (not shown) is built in the mold 24, and a plurality of resin-impregnated fiber prepreg tapes T are bundled by the action of the heater, and the surface of the resin-impregnated fiber prepreg tape T is arranged in a substantially circular sectional shape or a tubular shape. It is designed to maintain its softened state. This mold member can be arbitrarily exchanged in the case of molding a solid rod and in the case of molding a hollow tubular rod. Further, by changing the shape of the mold 24 used, the external shape of the straight rod obtained by the pultrusion molding can be finished in various shapes other than the circular shape, such as a convex polygon and a polygonal star. Further, on the path after exiting from the mold 24, a cooling means including cooling air nozzles 25A, 25B and 25C at three locations is provided as a cooling step. The cooling air supplied from the cooling blower 26 is ejected from each nozzle so that the rod can be gradually cooled. In this cooling process, a pair of stamping rollers 27 as a surface processing means are arranged.
The stamping roller 27 presses resin on the surface of the rod R to give a predetermined uneven shape (pattern) before the surface of the rod R is hardened, whereby a rod-like uneven shape such as a rope is formed on the rod surface. The concavo-convex shape is formed in order to enhance the adhesive strength with the surrounding filler when the tensile structural member is used as a reinforcing material such as a lock bolt. In order to increase the adhesion strength, various patterns and shapes that increase pullout resistance can be set.

Reference numeral 28 indicates a rod pull-out gripping device (pull-out caterpillar). The rod pull-out gripping device 28 is two infinite crawler belts made of resin that rotate while contacting their facing surfaces with the rod R sandwiched therebetween. The rod pull-out gripping device 28 pulls out the molded rod R in a state where sufficient rigidity and tensile strength are exerted as a tensile structural member, and a plurality of resin-impregnated fiber prepreg tapes T before being molded are in a predetermined tension state. Can be held at. Further, a rod cutting machine 29 is provided at the leading position of the rod forming carriage 20 so that the drawn rod R can be cut into a predetermined length. The rod cutting machine 29 is used for the rod forming carriage 20.
Instead of being mounted on the board, it may be cut into a desired length by a predetermined cutting device.

The bobbin arranging carriage 10 thus constructed
By installing the rod forming carriage 20 at a workable position near the site, it is possible to continuously manufacture a fiber-reinforced thermoplastic resin (hereinafter referred to as FRTP) rod R as a tensile structural member having a predetermined length. , Material loading and transportation work will be greatly reduced.

Next, the shape of the FRTP rod R manufactured by the above-mentioned pultrusion molding will be described with reference to FIGS. As shown in FIG. 4 (a), the FRTP rod R has a pattern formed by the stamping roller 27, which is formed by the uneven shape 41 on the surface. This uneven shape 4
1 makes it possible to secure sufficient adhesion strength with the cement milk when the rod R is fixed in the rod insertion hole by a filler such as cement milk. FIG. 3B shows a hollow tubular FRTP rod R. The same figure (c)
FIG. 8 is a perspective view showing a partial cross section showing a modified example in which a core body made of a heat-resistant resin is provided as a core material by insert molding. As shown in FIGS. 4 (b) and 4 (c), the hollow tubular portion is formed or the hollow tubular tubular core material 42 is provided. It can also be used as an injection route when injecting cement milk into the insertion hole, and it can also be used as an FRT.
It can also be used as a return path for cement milk injected from between the P rod R and the hole wall to check whether the cement milk has been reliably filled to the inner part of the hole.

The heat-resistant resin suitable for the core material 42 forming the hollow tubular body may be any material that can withstand the molding temperature when the resin-impregnated fiber prepreg tape T is melt-integrated. For example, as the thermoplastic resin, a general-purpose resin such as polyurethane resin, acrylic resin, general-purpose engineering plastic such as polyamide resin, polyester resin, polycarbonate resin, polyacetal resin, and other fluorine-based resin, polyphenylene ether, polyphenylene sulfide, polyether. There are sulfone, ketone resin, polyarylate, liquid crystal polymer, aramid, polyimide resin, poly P-phenylene, poly P-phenylene vinylene and the like, and fiber reinforced resins of these resins. Further, as the thermosetting resin, an epoxy resin,
Examples thereof include unsaturated polyester resin, alkyd resin, diallyl phthalate resin, polyurethane resin and melamine resin, and heat resistant synthetic rubber such as silicone rubber is also suitable. On the other hand, if a pipe made of polyethylene or polypropylene with a certain thickness is used, the pipe and the resin-impregnated fiber prepreg tape are integrated even if the pipe surface is softened due to heat, so it functions as a tensile structural member. Can be fully achieved.

In the manufacturing process, as shown in FIG. 6, the core material 42 is wound around a reel 43 installed between the heating heater 23 on the rod forming carriage 20 and the mold, and the rod forming carriage. 20 is preferably mounted. At this time, a guide roller 44 is provided so that the core material 42 comes to the center position of the plurality of resin-impregnated fiber prepreg tapes T in the softened and melted state, and the guide hole shape of the guide ring 21 is modified to further provide a heating heater. The second guide ring 45 is arranged at the position of the next step of 23, and the resin-impregnated fiber prepreg tape T is arranged in a circular shape at a predetermined interval,
The core material 42 is fed from the reel 43 to the center position. The FRT shown in FIGS.
Although the overall outer diameter of the P rod R is large, the number of bundles of the resin-impregnated fiber prepreg tape T is the same, so that FIG.
The cross-sectional area A1 of the FRTP rod R shown in Fig. 4 and Fig. 4
The cross-sectional area A2 of the tubular FRTP rod shown in (b) and (c) is equal. Further, in the case of FIG. 4C, when the integrity of the core material 42 and the FRTP rod R is maintained, the tensile force burden of the core material portion may be taken into consideration.

FIG. 5 shows, as a modification, a FRTP rod piece 4 having an arcuate cross section obtained by previously dividing a tubular cross section into three equal parts.
5 is combined to form a tensile structure member. In this modification, a plurality of FRTP rod pieces 45 are pultruded by the device shown in FIG.
The three FRTP rod pieces 45 can be integrally combined as shown in FIG. 5B to form the hollow portion 46 inside. In this state, the resin-impregnated fiber prepreg tape T in the softened and melted state is spirally wound around the outer peripheral surfaces of the three FRTP rod pieces 45 combined in a tubular shape as the covering tape 47, and the whole is integrated. This makes it possible to obtain the same effect as when the core material is used without using the core material.

In the above description, a thermoplastic resin is preferable as the resin used when manufacturing the resin-impregnated fiber prepreg tape T. Specifically, one kind or a combination of two or more kinds of thermoplastic resins selected from polyolefin resins, polyamide resins, polyester resins, and polyacetal resins can be used. Furthermore, in addition to the polypropylene resin as the polyolefin resin described in the above embodiments, polyethylene resin or the like can be used.

As the reinforcing fiber material, in addition to the long glass fiber used in the present embodiment, long fiber carbon fiber, ceramic long fiber (for example, boron fiber, alumina fiber, and silicon carbide fiber are exemplified. , Aramid fiber, stainless steel fiber, polyethylene fiber, or a combination of two or more types of fibers.

Here, a method of manufacturing a tensile structural member, which is carried out by the rod forming carriage 20 having the above-mentioned structure, will be briefly described step by step. (1) A predetermined number of resin-impregnated fiber prepreg tapes T are set on the rack 14 of the bobbin placement carriage 10. (2) The resin-impregnated fiber prepreg tape T drawn out from each bobbin 11 is focused in the guide holes of the plurality of guide rings 21 arranged on the rod forming carriage 20 so that the resin-impregnated fiber prepreg tape T can be easily bundled. Keep it. (3) The densely bundled resin-impregnated fiber prepreg tape T is guided into the high-frequency preheater 22 via the guide ring 21. The furnace temperature of the high-frequency preheater 22 is maintained at a degree of appropriate temperature for deformation of the resin, and the polypropylene resin is softened and melted to the inside of the focused state while passing through the furnace portion of the high-frequency preheater 22. (4) Further, it is passed through the mold 24 through the heating heater 23. At this time, there is a taper 24 at the entrance of the mold.
a is attached, and resin impregnated fiber prepreg tape T
It is designed to be able to narrow down a bundle of a. If necessary, a plurality of guide rings (not shown) may be provided to narrow down to the entrance of the mold 24. (5) After passing through the mold, the surface is still soft and the bending rigidity is small as a whole, which is a straight rod shape that cannot be self-standing. In this cooling step, the rod R is cooled from the surface by the cooling air supplied from the blower 26 via the nozzles 25 set in multiple stages. The rod R may be cooled by incorporating a cooling water system and supplying cooling water by a pump or the like. (6) Then, while the surface of the rod R is still soft, the rod R is passed through the pair of stamping rollers 27.
The surface is stamped with an uneven pattern to increase the adhesive strength with fillers such as cement milk. (7) Further, after the intermediate cooling process using the cooling air from the nozzle 25B, a predetermined tension is applied by the rod pull-out gripping device 28 to pull out the molded rod R from the mold 24. (8) The straight rod-shaped FRTP rod R can be obtained through the final cooling process using the cooling air from the nozzle 25C.
Since this FRTP rod R is manufactured in a single continuous shape, it may be cut to the required length with the cutting machine 29 before use.

Next, an application example in which the bobbin arranging carriage 10 and the rod forming trolley 20 as rod forming devices are arranged in a tunnel pit and an application example in which they are arranged on a slope excavator will be described with reference to FIG. To do. FIG. 7 (a) is a schematic construction state diagram showing a state in which a lock bolt for protecting a mirror face of a tunnel face is placed. A rock bolt jumbo 50 is arranged near the tunnel face 51, and a rod hole 52 horizontally drilled on the mirror surface 51 by the lock bolt jumbo 50 has a FRTP formed behind the tunnel face.
The rod R is inserted, and then a predetermined supporting effect can be exhibited by a filling operation with cement milk or the like. At this time, when a long lock bolt is used as a face protector, the lock bolt length may be 10 m or more. In this case, it has been troublesome to handle the rod made of fiber reinforced thermoplastic resin having a conventional fixed length and the cable type at the cutting face position. However, according to the present invention, since the long lock bolts are continuously formed and stocked behind the face and can be easily carried to the face, it is possible to drive the lock bolt very efficiently.

FIG. 7B is a schematic construction state diagram showing an example applied to the site of the ground stabilization method using anchor bolts on the cut slope 53. As shown in the figure, a crawler type jumbo 5 for bolt hole drilling is provided on the slope excavator 54.
5 is arranged, and a bobbin placement carriage 10 and a rod forming carriage 20 are located behind it. Since the long anchor bolt can be manufactured on site in this way, the labor of carrying the anchor bolt can be omitted.

In the above description, the bobbin placement carriage 10 is used.
Although the rod forming trolley 20 and the rod forming trolley 20 are separate structures, it goes without saying that a trolley in which the both are integrated may be used.
Further, in each of FIGS. 7A and 7B, the FRTP rod R manufactured behind the position where the rock bolt is set is stocked on the dolly or the like. However, the drilling device and the rod forming dolly 20 are integrated into a device, and If the rod loading device is provided, the FRTP rod R formed by the rod forming carriage 20 can be directly placed in the rod insertion hole formed in the natural ground. In this case, explaining with the example shown in FIG. 1, when the rod R is being driven, the gripping device 2 for pulling out the rod 2
Although it is necessary to stop 8 to stop the molding line, the resin-impregnated fiber prepreg tape T is in a softened and melted state by the heating heater 23 and the heater built in the mold 24 and can be molded into the FRTP rod R. State is retained. Therefore, FR with stable quality even when the molding operation is restarted
The TP rod R can be formed by drawing.

Resin impregnated fiber prepreg tape T to FR
The fiber running path of the forming line formed on the TP rod R is set to have a straight line shape as shown in FIG. 1, and a direction changing member such as a pulley is interposed after passing through the heating heater 23. It is also possible to bend the path and place a mold on the path after the curve to change the discharge direction of the molded FRTP rod R.

[0036]

As is apparent from the above description, according to the present invention, a fiber-reinforced thermoplastic resin rod having a number and length as required at a site where a tension structural member such as a rock bolt is installed. It is possible to continuously form the tensile structural member, and it is possible to efficiently perform the ground reinforcement work using the lock bolt or the like. In addition, by using the fiber-reinforced thermoplastic resin rod having the hollow portion, it is possible to reliably perform the ground fixing operation by the filler.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a rod forming apparatus used in a method for manufacturing a tensile structure member according to the present invention.

FIG. 2 is an explanatory view showing an example of a bobbin wound with a wire-shaped and tape-shaped resin-impregnated fiber prepreg, and a partially enlarged view of a resin-impregnated fiber prepreg tape T.

FIG. 3 is a production flowchart showing an example of a method for producing a resin-impregnated fiber prepreg tape used in the method for producing a tensile structural member of the present invention.

FIG. 4 is a partially enlarged perspective view showing an example of a fiber-reinforced thermoplastic resin rod.

FIG. 5 is a partially enlarged perspective view and a cross-sectional view showing an example of a fiber-reinforced thermoplastic resin rod.

FIG. 6 is a schematic configuration diagram showing an embodiment of a rod forming apparatus for forming a fiber-reinforced thermoplastic resin rod having a core material.

FIG. 7 is a state explanatory view showing a construction state in which a rod forming device is arranged on site and used.

[Explanation of symbols]

 10 bobbin placement cart 11 bobbin 14 rack 20 rod molding cart 21 guide ring 22 high frequency preheater 23 heating heater 24 mold 25A, 25B, 25C cooling nozzle 26 cooling blower 27 stamping roller 28 rod pulling gripping device T resin impregnation Fiber prepreg tape R Fiber reinforced thermoplastic resin rod (FRTP rod) W Resin impregnated fiber prepreg wire

Front Page Continuation (72) Inventor Satoshi Kawaguchi 4902 Takachaya Komori-cho, Tsu-shi, Mie Nihon Glass Fiber Co., Ltd. 72) Inventor Hideo Iwatsuki, Fujimori Industrial Co., Ltd. 1-2-17 Higashishimbashi, Minato-ku, Tokyo (72) Inventor Kazuhiko Noguchi 1-2-17, Higashishimbashi, Minato-ku, Tokyo Fujimori Co., Ltd.

Claims (19)

[Claims] 1. A resin-impregnated fiber prepreg, which is made of a reinforced long-fiber material impregnated with a thermoplastic resin, and which has been wound in advance, is carried into the vicinity of a site where a tensile structure member is to be constructed, and a plurality of the resin-impregnated fiber prepregs are provided. It is drawn out under a predetermined tension to be bundled, and further heated to soften and melt the thermoplastic resin of the resin-impregnated fiber prepreg that has been bundled, and after heating, it is passed through the mold to be withdrawn and drawn into a straight rod-shaped fiber-reinforced thermoplastic resin. Mold a rod made of aluminum, form an uneven shape on the rod surface while the surface of the rod is softening, and then cut the rod to a desired length at the site, so that it can be directly installed at the site The tensile structure member characterized by having been made. 2. A resin-impregnated fiber prepreg, which is made of a reinforced long-fiber material impregnated with a thermoplastic resin, and which has been pre-wound, is carried into the vicinity of the site where a tensile structure member is to be constructed, and a plurality of the resin-impregnated fiber prepregs are provided. It is drawn out under a predetermined tension to be bundled, and further heated to soften and melt the thermoplastic resin of the resin-impregnated fiber prepreg that has been bundled, and after heating, it is passed through the mold to be withdrawn and drawn into a straight rod-shaped fiber-reinforced thermoplastic resin. A rod made of metal, and while the surface of the rod is softened, a concavo-convex shape is formed on the surface of the rod. Then, the rod is cut into a desired rod length at the site, and a tensile structure member is constructed at the site. The method for producing a tensile structural member is characterized in that: 3. A rack movably installed at a work position near a site where a tensile structure member is installed and capable of mounting a plurality of bobbins, and a resin impregnated with a thermoplastic resin drawn from each bobbin on the rack. Focusing guide member for focusing the resin-impregnated fiber prepreg made of the reinforced long fiber material, heating means for heating the passing resin-impregnated fiber prepreg, which is arranged adjacent to the focusing guide member, and pulled out from the heating means. A mold for drawing out the resin-impregnated fiber prepreg in a softened and molten state, and a surface processing means for subjecting the surface of a rod made of a straight rod-shaped fiber-reinforced thermoplastic resin obtained by passing through the mold to concavo-convex processing And a cooling means for gradually cooling the rod. 4. A resin-impregnated fiber prepreg made of a reinforced long-fiber material impregnated with a thermoplastic resin is wound around a bobbin in advance, and the bobbin is installed at a work position near a site where a tensile structure member is constructed. Item 3. The rod-forming apparatus according to item 3, the resin-impregnated fiber prepreg is pulled out from a plurality of the bobbins under a predetermined tension to be bundled, and further passed through the heating means to obtain the bundled resin-impregnated fiber prepreg. The thermoplastic resin is softened and melted, and after passing through the heating means, a rod-shaped fiber-reinforced thermoplastic resin rod having a straight rod shape is formed by drawing in the mold, while the rod surface is softened, Forming a concavo-convex shape on the rod surface by the surface processing means, then cut into a desired rod length at the site, and continuously pulling structural members constructed at the site. Method for manufacturing a tensile structural member, characterized in that so as to granulation. 5. The first heating device, wherein the heating means softens and melts the thermoplastic resin of the resin-impregnated fiber prepreg,
The rod forming apparatus according to claim 3, comprising a second heating device that holds the softened and melted state before the pultrusion molding with a die. 6. The surface processing means is a roller capable of holding the rod made of the fiber-reinforced thermoplastic resin in the shape of a straight rod, and an uneven shape is formed on the surface of the roller. The rod forming apparatus described. 7. The resin impregnated fiber prepreg comprises reinforcing long fiber material 20 to 400 with respect to 100 parts by weight of a thermoplastic resin.
The tensile structural member according to claim 1, wherein the tensile structural member is a resin-impregnated fiber fine wire material composed of parts by weight. 8. The resin-impregnated fiber prepreg comprises a reinforcing long fiber material 20 to 400 based on 100 parts by weight of a thermoplastic resin.
The method for producing a tensile structural member according to claim 2 or 4, which is a resin-impregnated fiber fine wire material consisting of parts by weight. 9. The resin-impregnated fiber prepreg comprises reinforcing long fiber materials 20 to 400 based on 100 parts by weight of a thermoplastic resin.
The tensile structural member according to claim 1, which is a resin-impregnated fiber tape composed of parts by weight. 10. The resin-impregnated fiber prepreg comprises reinforcing long fiber materials 20 to 40 relative to 100 parts by weight of a thermoplastic resin.
The method for producing a tensile structural member according to claim 2 or 4, which is a resin-impregnated fiber tape comprising 0 parts by weight. 11. The thermoplastic resin according to claim 2, wherein the thermoplastic resin is a thermoplastic resin composed of at least one resin selected from polyolefin resins, polyamide resins, polyester resins and polyacetal resins. 4. The method for manufacturing the tensile structure member according to 4. 12. The method for manufacturing a tensile structure member according to claim 11, wherein the thermoplastic resin is mainly made of polypropylene resin or polyethylene resin as a polyolefin resin. 13. The reinforcing long fiber material is glass long fiber,
Long fiber carbon fiber, ceramic long fiber, aramid fiber,
The method for manufacturing a tensile structural member according to claim 2 or 4, wherein the tensile structural member is made of at least one fiber selected from steel fibers and polyethylene fibers. 14. The tensile structural member according to claim 1, wherein the fiber-reinforced thermoplastic resin rod is formed in a hollow tubular shape. 15. A rod made of a fiber reinforced thermoplastic resin is formed by coating a hollow tubular core material extending in the rod longitudinal direction with the resin-impregnated fiber prepreg. Tensile structural member. 16. The fiber-reinforced thermoplastic resin rod is molded by coating the periphery of a rod piece having a plurality of hollow tubular portions extending in the rod longitudinal direction with the resin-impregnated fiber prepreg. The tensile structure member according to claim 14, wherein the tensile structure member is formed. 17. The method for manufacturing a tensile structural member according to claim 2, wherein the fiber-reinforced thermoplastic resin rod is formed into a hollow tubular shape. 18. The fiber-reinforced thermoplastic resin rod is formed by coating a hollow tubular core material extending in the longitudinal direction of the rod with the resin-impregnated fiber prepreg. Of the tensile structural member of. 19. The rod made of a fiber reinforced thermoplastic resin is formed by coating the periphery of a rod piece formed of a plurality of hollow portions formed in the longitudinal direction of the rod with the resin impregnated fiber prepreg. The method for manufacturing a tensile structure member according to claim 17, wherein