JPH09177748A - Lock bolt made of frp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength by taking a hollow bar-shaped body as a core material, spirally winding a yarn-shaped fiber on the front surface of a bar-shaped long fiber object at distances, and specifying the difference of elevation between each projecting part and each recessed groove part, the rate of the difference of elevation in relation to the radius of the groove part, the spiral pitch, and the internal pressure resistance of the bar-shaped body. SOLUTION: A hollow bar-shaped body 25 is taken as a core material, a yarn-like fiber 2 is spirally and integrally wound and fastened around the front surface of a bar-shaped long fiber object formed by impregnating a thermosetting resin, and continuing in the longitudinal direction at distances in the outer peripheral axial direction, each recessed groove part 4 is formed into the diameter (d), and each projecting part 3 between mutually adjacent groove parts 4 is formed into the outside diameter D of a lock bolt 1. Hardening is repeatedly and continuously performed so that the difference of elevation between each projecting part 3 and each groove part 4 may be in the range of 0.5 to 2.5mm, the rate of the difference of elevation Δd in relation to the diameter (d) may be in the range of 0.02 to 0.25, the pitch A or (a) of the projecting parts 3 or the groove parts 4 may be in the range of 5 to 20mm, and the internal pressure resistance of a hollow part is set to 50kgf/cm<2> . Therefore, the resin and the fiber are made into a state where they are uniformly arranged and dispersed, the fiber itself is not exposed on the front surface, the front surface is smoothed, and the strength is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it possible to exert the original holding ability of the ground in the reinforcement of the ground when excavating a tunnel or cutting a steep slope.
Further, the present invention relates to a useful rock bolt made of FRP, which can be sufficiently adapted when pouring cement or the like. Not only mountain-type construction, but also large-scale and multi-section urban or submarine-type underground space construction, as well as reinforcement work such as cut or embankment slopes where the conditions of various grounds are not good. The present invention provides a lock bolt made of FRP, which is adaptable to the needs of diversification, high performance, and easy handling and can be widely adopted.

[0002]

2. Description of the Related Art In recent years, as one of the ground reinforcements in various tunnels, various underground spaces, roads and residential area construction slopes, etc., instead of conventional steel bolts, they are light and strong and have no corrosion and electrical insulation. FRP rock bolts, which are flexible and can be easily cut, have become widespread and are being used more and more.

For example, Japanese Patent Application Laid-Open No.
In 148087, a thread-like fiber is integrally wound spirally in the direction of the outer peripheral axis of the surface of a rod-shaped resin substrate made of glass fiber impregnated with a thermosetting resin, and a continuous convex line is formed by the thread-like fiber. A glass fiber reinforced resin body formed.
And in the continuous molding method of the glass fiber reinforced resin body, after the glass fiber impregnated with the thermosetting resin is drawn out from the orientation plate, the squeeze mold and the heating mold to form a rod-shaped resin substrate, the surface of the rod-shaped resin substrate is Described is a method for producing a glass fiber reinforced resin body in which filamentous fibers are continuously wound in a spiral shape in the direction of the outer peripheral axis to form a continuous convex line and then heat-cured in a curing heating furnace. Uses a rod material such as plastic as a core material, and aligns glass roving impregnated with a thermosetting resin on the rod material, and as the filamentous fiber, glass roving, nylon, vinylon, tetron, etc. The use is disclosed.

[0004] For example, Japanese Patent Publication No.
Japanese Patent No. 57-18484 describes a method for forming a concavo-convex pattern on the surface of a glass fiber reinforced resin body. In the continuous pultrusion molding method for a glass fiber reinforced resin body, the surface of the mandrel is impregnated with a thermosetting resin. After the glass fiber reinforced resin body in which the glass fibers are aligned and passed through a heating mold to be semi-cured, a spiral groove is continuously formed in the outer peripheral axial direction of the resin body by a pressure contact tool, Then, it is disclosed that the resin body is heated and cured in a curing heating furnace.

On the other hand, for example, Japanese Utility Model Publication No. Hei 3-18555 discloses that in a tensile reinforcing material inserted into a drilled hole in the ground together with a self-hardening material for fixing, the tensile reinforcing material is an uncured thermosetting resin. After twisting or braiding a composite strand in which the outer peripheral surface of the reinforcing fiber bundle impregnated with a thermoplastic resin is twisted or braided, the thermosetting resin is cured, and the thermoplastic resins of the adjacent composite strands are bonded together. Are described in Japanese Patent Application Laid-Open No. H11-157572, which are inserted into a ground hole made of a rope-like structure which is entirely fusion-bonded in a longitudinal direction at a mutual contact portion.

For example, Japanese Patent Publication No. 3-49358 discloses that
In the rock anchor method, the rock bolt has a compression modulus of 150 kg / mm ² or more that can be inserted against the self-hardening material filled in the drill hole, and can cope with the bending of the drill hole and the bending of the drill hole itself. shall apply in a rope-like structure having / mm ² flexural modulus in the range of to 100 kg / mm ^2, those impregnated with a thermosetting resin to the reinforcing fiber bundle the rope-like structure as a core material, the core material After twisting or braiding a composite strand whose outer periphery is coated with a thermoplastic resin, the thermosetting resin is heat-cured, and a contact portion of the thermoplastic resin in the twisted or braided composite strand is fused and bonded. It is described that a reinforced thermosetting resin / composite material is inserted into the hole.

Further, for example, Japanese Patent Publication No. 4-89346 discloses a concrete reinforcing member and a method of manufacturing the same, and a rod-shaped core material in which a thermosetting resin is reinforced with reinforcing fibers arranged in a longitudinal direction. A reinforcing fiber is disposed in the longitudinal direction on the outer periphery of the fiber, and the reinforcing fiber is impregnated with a thermosetting resin,
The surface of this resin-impregnated coating layer is provided with irregularities in the longitudinal direction by appropriate means, and the coating layer and the rod-shaped core material are integrally thermoset, and the thermosetting resin is impregnated. The unreinforced or semi-cured core material is formed by passing the reinforcing fiber through a die, the reinforcing fiber is disposed in the longitudinal direction on the outer periphery of the core material, and the reinforcing fiber is impregnated with a thermosetting resin. Then, a fastening material is wound around the outer layer of the resin-impregnated coating layer at intervals, and irregularities are arranged side by side in the longitudinal direction on the surface of the coating layer,
A production method is described in which the coating layer and an uncured or semi-cured rod-shaped core material are heated and integrally cured by heating.

Further, for example, there is a fixing device for a rod-shaped tension member made of a fiber composite material, which is described in Japanese Patent Laid-Open No. 2-147749.

[0009]

As described above, the glass fiber reinforced resin body and the method for producing the same described in Japanese Patent Laid-Open No. 148087/1979 are applied to, for example, mortar injected into the wall surface of a tunnel. In this case, it possesses sufficient rigidity and is excellent in shear resistance and tensile strength by being reinforced with glass roving, and it is firmly fixed in the uneven shape by glass roving wound on the surface spirally, and contributes sufficiently to strengthening the tunnel wall surface. However, as demand continues to increase and diversify, more and more robust reinforcements, more effective structures, and more efficient manufacturing methods are sometimes needed. It is hard to say that is extremely sufficient.

Further, the method of forming a concavo-convex pattern on the surface of the glass fiber reinforced resin body described in Japanese Patent Publication No. 57-18484 has a method in which the resin body is semi-cured in a heating die and a mold release agent is used. The coated or coated metal wire is wound around and wound up and removed, or the press-connecting tool, which is a die-shaped die with continuous threads on the inner surface, is rotated around the resin body axis. Although high productivity is achieved by doing the above, the former does not necessarily have an uneven pattern due to winding, both require enormous mechanical force, equipment for winding and removing or pressure contact tool such as die-shaped mold It is also difficult to say that the needs such as a more rigid reinforcement material, a more effective structure and a more efficient manufacturing method are not always sufficiently answered. A.

Further, a tensile reinforcing material having a rope-like structure described in Japanese Utility Model Publication No. 3-18555 and Japanese Patent Publication No. 3-49358, or a rope-like structure having a specific elastic modulus is processed into a core material, Lock bolts, etc. made from fiber-reinforced thermosetting resin / composite material by further processing the outer circumference are not always easy to say, and it cannot be said that they are excellent in physical properties such as bending elastic modulus, and they are more stubborn. It can be said that there is no need to meet such needs as various reinforcing materials, more effective structure and more efficient manufacturing method.

Furthermore, in a conventional FRP rock bolt using a hollow rod-shaped body such as a mandrel, the internal pressure applied to the inner surface of the hollow rod-shaped body when cement or the like is injected, for example, about
There is nothing to withstand 50 kgf / cm ² about pressure, cement or the like in recent opportunities for injection are many clears sufficiently the pressure withstand about 50 kg f / cm ² of about or more pressure at work in particular to the There is a long-awaited demand for a lock bolt made of FRP that enables stable and reliable injection of cement or the like with a sense of security.

[0013]

The present invention is based on this point.
It was done in view of the above, and the required variety and higher
It has moderate performance and can be used extensively, and is used during tunnel excavation.
Various types including underground structures, cliffs, etc.
Instead of reinforcing bars, etc., for reinforcement and improvement of soft ground.
Moreover, the FRP lock bolt products themselves
Hollow rod-shaped when injecting cement etc. into the hollow rod-shaped body
Internal pressure on the body surface, for example, about 50kg f / cm ^TwoWithin a degree
Sturdy reinforcement than conventional FRP lock bolts that withstand pressure
Steel anchor bolts with wood and more effective structure
Recently, it can be connected and used both structurally and structurally.
A useful FRP lock bolt that can be applied to the needs of
To provide.

That is, according to the present invention, in a rock bolt made of FRP composed of a long fibrous fiber material, a thermosetting resin, and a hollow rod-shaped body, the hollow rod-shaped body is used as a core material, and the thermosetting resin is impregnated in the longitudinal direction. On the surface of the continuous rod-shaped long fibrous fiber material, the thread-shaped fiber material is integrally wound in a spiral shape at intervals in the outer peripheral axial direction and tightened, and the wound-up thread-shaped fiber material portion has a spiral shape. The concave groove portion and a convex crest portion are formed between the adjacent spiral concave groove portions, and the height difference between the convex crest portion and the concave groove portion is 0.5 to 2.5 mm, and The ratio of the height difference value to the radius of the concave groove is 0.
02 to 0.25, and further, the convex peaks or the concave grooves are repeatedly and continuously cured so that the pitch becomes 5 to 20 mm, and the internal pressure resistance in the hollow rod-shaped body is 50 kg f.
/ Cm ² or more, FRP characterized by having
Made bolts.

Further, the lock bolt made of FRP described above, wherein the long fibrous fiber material is glass fiber. Further, the FRP rock bolt described above is characterized in that the surface of the FRP rock bolt is coated with a thermosetting resin.

Further, the FRP rock bolt described above, wherein the thermosetting resin is an unsaturated polyester resin, a vinyl ester resin or an epoxy resin. Furthermore, the FRP lock bolt is
The FRP lock bolt described above, which can be connected to a 32 mm iron anchor bolt.

Further, the lock bolt made of FRP has a tensile strength of 20 ton f (52 kg f / mm ² ) or more and a screw shear strength of 17 ton f or more. Are provided respectively.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Here, the long fibers are glass rovings made of, for example, preferably glass fibers, especially E-glass fibers, and are mainly available, cutting load and tensile strength (generally, diameter). Is smaller), a fiber diameter of, for example, about 6 to 30 μm, preferably about 11 to 27 μm, more preferably about 13 to 24 μm is used, and the degree of resin impregnation and the arrangement and homogenization on the cross section are made uniform. From the viewpoint of production efficiency, stability during production, achievement of desired product strength, etc., the roving is, for example, about 1150 to 9240 tex, preferably about 2310 to 4620 tex, and further, for example, the tex (tex).
About 100 to 250 rovings, preferably about 12
About 0 to 230 lines are used, and more preferably about 130 to 210 lines are used. As other fibers, for example, S glass having high tensile strength, YM glass, strength-up glass, etc. may be used among glass fibers, and further, carbon fibers, composite fibers mixed with various organic or other inorganic fibers such as Kepler fibers, and further, in the case where In some cases, fine metal fibers may be used singly or in combination, so that the characteristics of various fibers are synergistic.

The thermosetting resin is, for example, unsaturated polyester resin, vinyl ester resin, epoxy resin or the like. Among them, unsaturated polyester resins are economically preferable, and vinyl ester resins or epoxy resins are preferable. However, epoxy resins are relatively expensive and are difficult to employ. For the preparation of the thermosetting resin, for example, in the case of a vinyl ester resin, t-Butyl peroxy-2-ethylhexano
The viscosity of the resin solution is adjusted to, for example, 550 to 750 cps in order to add and mix nte and the like as appropriate to make the impregnation easy and uniform and the impregnation amount within the desired range and to satisfy the conditions of the next step. Degree, preferably about 600 to 700 CPS.

Further, regarding the rod-shaped long fiber fibrous material impregnated with the thermosetting resin and continuous in the lengthwise direction, the hollow rod-shaped body is used as a core material, and the rovings, which are sufficiently long fibers, are uniformly dispersed in the cross section to obtain a length. The thermosetting resin is impregnated in the continuous direction, and is held appropriately in the optimum state to form the concave groove and the convex mountain portion, and the filamentous fibers are spirally integrated at intervals in the outer peripheral axial direction. It is essential that the desired winding can be tightened, and the ratio of the long fiber roving and the resin to be impregnated is, for example, about 60 to 70 vol% for glass fiber. When it goes out of the range, it gradually deforms during the winding and various strengths of the product,
In particular, it is difficult to obtain the desired tensile strength and shear strength, and it is preferably about 62 to 68 vol%.

Regarding the hollow rod-shaped body as the core material,
Usually made of synthetic resin such as vinyl chloride or polycarbonate
A FRP lock, which is a pipe (including a mandrel) made of grit, having an outer diameter of a size that does not hinder the formation of the concave groove portion and the convex mountain portion, and is intended. It is preferable if the bolt has a thickness and inner and outer diameters that increase strength and lead to further weight reduction.
For example, as a PVC pipe, the outer diameter is about 10 to 18 mm,
It is important that the inner diameter is about 6 to 14 mm and the wall thickness is about 1.5 to 2.5 mm, which does not hinder the use.

In order to integrally wind and tighten the thread-like fiber material in a spiral shape at intervals in the outer peripheral axis direction, the taper shape is surely and stable and the apex of the protrusion is an arc shape. The purpose is to form a convex crest portion and a concave groove portion having a sufficient catch so that basically there is no need to re-thread, for example, and the winding tension, which is the force for winding and tightening, is about 0.5 to 5 about kgf, preferably about 1
The pitch of the concave grooves or the convex peaks at the interval is about 5 to 20 mm, preferably about 6 to 17 mm, more preferably about 7 to 15 mm. The pitch of the concave groove portion and the convex peak portion is substantially the same, and the pitch of the concave groove portion and the convex peak portion, the degree of flexibility and the ratio of roving, and the degree of flexibility and diameter of the rod-shaped long fibrous fibrous material are appropriately determined. It can be adjusted freely to obtain the expected one.

Further, the thread-like fibrous material is one which forms a sufficient concave groove portion, withstands winding tension and is sufficiently impregnated with at least a resin exuded by winding, and can be left as it is as a concave groove portion. In addition, it increases the overall strength, for example, vinylon (for example, about 1500 to 2000 denier, specifically about
1700-1900 denier) and also, for example, Tetron,
Kepler, nylon, and glass yarn (5.6 to 135t
ex) or glass roving (1150-4620 tex), and the diameter thereof is about 4-18 μm, for example, about 6-13 μm.
A combination of ~ 3 types may be used in the form of a complex mixture, and the cross-sectional shape is not particularly limited. For example, a screw may be used if the cross-sectional shape is appropriately formed into a band shape. The thread-like fibrous material may be impregnated with a resin, but is not necessarily required.

Further, regarding the thread-like fibrous material portion which is wound up and tightened into a spiral concave groove portion, the depth of the concave groove portion is taken into consideration due to the above-mentioned threaded shape and familiarity as a catch at the time of use. The height difference between the convex ridge and the concave groove is about 0.5 to 2.5 mm.If it is less than 0.5 mm, the screw as a catch or the familiarity during use becomes insufficient, and if it exceeds 2.5 mm, the concave groove is formed. The ratio of the resin becomes too deep and too small, and moreover, deformation of the convex mountain portion, sagging of the resin and variation of the fiber occur, which eventually leads to a decrease in strength, etc., and preferably the depth is About 0.7 to 2.3 mm, more preferably about 0.8 to 2.0 mm
It is about.

Further, the ratio of the height difference value to the radius of the concave groove portion is 0.02 to 0.25, which means that the F
The outer diameter of the rock bolt made of RP is, for example, about 18 to 38 mm diameter, preferably about 20 to 32 mm, more preferably about 21 to 20 from the viewpoint of workability in weight and the number required in use.
It is about 32 mm, especially the outer diameter of the iron anchor bolt is 32 mm.
mm, and it is preferable to be able to connect to this.
It is optimal to set the same as the outer diameter of the lock bolt made of about 32 mm, and in appropriately selecting the depth of the recessed groove portion within the range of the outer diameter, as one factor for obtaining the intended strength. The ratio of the height difference value to the radius of the concave groove portion needs to be taken into consideration, and the range is about 0.02 to 0.25, preferably about 0.03 to 0.22, and more preferably about 0.04 to 0.20.

The drawing device is not particularly limited, but is, for example, about 15 to 60 cm / min, preferably about 20 to 50 cm / min, more preferably about 25 to 40 cm / min. The tensile speed can be stably operated without any trouble, and the desired shape and strength can be obtained without causing deformation such as bending as a product.

Furthermore, what is important in producing the FRP lock bolt of the present invention is that the resin, fibers, impregnation amount, shape, size, etc. are of course the same as those mentioned above, and they can be used immediately after the mold is ejected. This is a procedure in which the filamentous fiber material is wound around the rod-shaped long fiber material having the optimum flexibility.

Further, regarding the size of the FRP lock bolt, the outer diameter is about 18 to 38 mmφ, preferably about 20 to 32, from the viewpoint of strength and handling as described above.
mm φ, more preferably about 21 to 32 mm φ, the length is not particularly limited as a single item and can be appropriately cut and selected, and it is naturally limited by the manufacturing location and product needs. It is a constraint, preferably about 0.8 to 3 m, more preferably about 1 to 2 m, and the length of the result of further joining is about 0.8 to
About 10 m, usually about 1-6 m, preferably about
It is about 1.2 to 5 m, and it goes without saying that the diameter and the length can be freely selected as needed.

The characteristic of the FRP rock bolt as a product is that the internal pressure resistance of the hollow portion of the hollow rod-shaped body is about 50 kg f / cm ² or more, preferably about 80 kg f / cm ^2.
And more preferably about 100 kg f / cm ² or more, and the tensile strength is about 20 ton f (52
kg f / mm ² ), preferably about 21 ton f (55 kg f / mm ² ), and a screw shear strength of about 17 ton f or more, preferably about 19 ton.
It has a value of f or more.

Further, for example, the flexural modulus is 400 ton f / cm ²
Bending strength of 4 to 8 ton f / cm ² or more (4 point bending)
The elongation is less than 1.5-2.5%, the tensile modulus is
210~300ton f / cm ² or so, preferably the tensile modulus 5
It is about 00 to 700 ton f / cm ² and specific gravity is about 1.6 to 2.0.

As described above, according to the FRP rock bolt of the present invention, the hollow rod-shaped body, the long fiber-like fiber material such as glass fiber and the thermosetting resin such as vinyl ester resin are used. A filamentous fiber material, such as vinylon, is spirally and integrally wound around the surface of a rod-shaped long fiber material impregnated with a curable resin and continuous in the lengthwise direction at intervals. Attaching and tightening, continuously forming the spiral concave groove portion and the convex mountain portion adjacent thereto, and the height difference between the convex mountain portion and the concave groove portion is 0.5 to 2.5 mm, and the concave shape The ratio of the height difference to the radius of the groove is 0.02 to 0.25, and the convex peaks or the concave grooves have a pitch of 5 to 20 mm. Internal pressure resistance is 50 kg f / cm
By using a lock bolt made of FRP having ^two or more, with a uniquely limited shape, a uniform array dispersion is achieved in the ratio of the specified resin and long fibrous fibrous material, and a convex mountain portion is formed. The state of the fiber and resin in the concave groove can be minimized so as not to change as much as possible, and the fiber itself can be covered with resin without being exposed to the surface, and the surface is finished cleanly, and the FRP rock bolt itself In addition to the characteristics, various strengths are increased, of course, a reliable and accurate screw is formed, there is no need for screwing, there is no need for screwing work, and there is no reduction in strength due to that, so a small number It has various and higher performance required and can be used more often, and it has good conditions for various rock mass characteristics such as when excavating a tunnel or the tunnel itself. Not only steep cutting or embankment slopes, but also mountain-type construction, as well as large-scale and multi-section cities or sea-bed type underground spaces, various underground structures, and soft grounds such as cliffs. It is equipped with a sturdier reinforcement material and a more effective structure than the conventional FRP lock bolts that replace reinforcing steel bars, etc., to make the ground's original holding ability more effective in improving the reinforcement of the ground. It is a useful FRP lock bolt that can be widely adopted and adapted to meet the needs of performance improvement and ease of handling.

[0032]

An embodiment of the present invention will be described below in detail with reference to the drawings. However, the present invention is not limited to such an embodiment.

FIG. 1 is a partially enlarged front view showing the FRP lock bolt of the present invention with a part thereof cut away and omitted.
The lock bolt 1 made of FRP is composed of a hollow rod-shaped body 25, a long fibrous fiber material and a thermosetting resin. Further, the construction is such that the hollow rod-shaped body 25 is used as a core material and is impregnated with the thermosetting resin in the longitudinal direction. The filamentous fiber material 2 is spirally and integrally wound around the surface of the continuous rod-shaped long fibrous material at intervals in the axial direction of the outer periphery and tightened, and the threaded fiber material portion 2 wound up is spirally wound. -Shaped concave groove portion 4 has a diameter d, and a convex mountain portion 3 is formed between the adjacent spiral concave groove portions 4 as an outer diameter D of the lock bolt 1 made of FRP. 3 and the concave groove portion 4 have a height difference Δd of 0.5 to 2.5 mm, and the ratio of the height difference value Δd to the diameter d of the concave groove portion 4 is 0.02 to 0.25, and the convex mountain portion 3 Alternatively, the pitch A or a of the recessed groove portions 4 is repeatedly hardened so as to be 5 to 20 mm. One in which you composed.

[0034] Figure 2 is a another embodiment front view and partially enlarged showing the Rotsukuboruto made of the FRP of the present invention, Rotsukuboruto 1 made the FRP ', like the Rotsukuboruto 1 made of FRP which is the hollow A rod-shaped body 25, a long fibrous fibrous material, and a thermosetting resin. The composition is impregnated with a thermosetting resin, and two rod-shaped long fibrous fibers are formed on the surface of the continuous rod-shaped long fibrous fiber. The thread-like fiber material 2 is spirally wound around the belt in a spiral shape at intervals in the outer peripheral axial direction and tightened, and the wound-up thread-like fiber material portion 2 is a spiral groove-shaped groove 4 in a flat belt shape. 'The spiral groove portion 4'which forms and is adjacent to
The convex ridge 3'is provided between the spaces between the lock bolts made of FRP.
When the outer diameter is 1'and the diameter of the concave groove portion 4'is d and the outer diameter is D, the convex crest portion 3'and the concave groove portion 4'are the same as shown in FIG. Height difference Δd of 0.5 to 2.
5 mm, the ratio of the height difference value Δd to the diameter d of the concave groove portion 4 ′ is 0.02 to 0.25, and the pitch of the convex crest portion 3 ′ or the concave groove portion 4 ′ is A or It is formed by repeatedly and continuously curing so that a becomes 5 to 20 mm.

FIG. 3 is a schematic view of the entire drawing apparatus of one embodiment including a partial cross section for producing the FRP lock bolt of the present invention. Based on the apparatus, the FRP of the present invention is shown.
The manufacturing method of the manufactured lock bolt will also be described.

A hollow rod 25 is supplied as a core material, and a required number of a plurality of roving winding bundles 6 (only one is shown in the figure) are provided on a floor. The roving bundle 6 is set so as to rotate freely around the support shaft, and the roving bundle 6 is rotated by the rotation of the roving bundle 6.
Are taken out, and a considerable number of rovings 7 are simultaneously sent to the resin liquid tank 8 filled with the thermosetting resin liquid. In addition, a plurality of the liquid tanks 8 are appropriately arranged according to the number of the rovings 7.

Each of the rovings 7 sent in passes through the thermosetting resin liquid in the resin liquid tank 8 while being guided by the guide rolls 20 and 21 to be impregnated with the resin liquid. It is pulled out to the right and proceeds to the orientation plate 9 where the impregnating rovings 7'are properly supported.

The orientation plate 9 has a circular opening with a slightly larger diameter in the central portion, and pores for impregnating rovings 7'arranged so as to be dispersed in a plurality of rows substantially uniformly around the opening. 22 is provided, and the impregnating rovings 7 ′ are selected and passed through the pores 22 so that the impregnated roving 7 ′ has a predetermined distribution on a circular cross section, and reaches the mold 10 with a heater 23 for guide and squeeze.

In the mold 10, a rod-shaped long fibrous fiber material 24 impregnated with a thermosetting resin and continuous in the lengthwise direction, for example, rovings are properly aligned and drawn in a cross section and uniformly dispersed, is formed. By removing excess resin liquid and defoaming, and by adjusting the temperature with the heater 23, etc., the outer diameter is in the range of about 18 to 38 mm and the fiber ratio is about 60 to 70.
vol% and have a flexibility immediately after coming out of the mold, and in a state where it can be sufficiently wound and tightened to form a concave groove portion and a convex mountain portion. I do.

Next, the winding machine 11 that revolves around the rod-shaped long fibrous material 24 is supported and while revolving the filamentous material 2 of vinylon (for example, about 1500 to 2000 denier) drawn from the winding bundle. The rod is wound around the rod-shaped long fibrous material 24 in a spiral shape so that the winding tension is about 0.5 to 5 kgf. After curing, the pitch of the concave groove portion or the convex mountain portion which is the interval is about 5 to 20 mm, and the height difference between the convex mountain portion and the concave groove portion which is the depth of the concave groove portion is obtained. Is about 0.5 to 2.5 mm, the ratio of the height difference to the radius of the concave groove is about 0.02 to 0.25,
The outer diameter of the FRP rock bolt is, for example, about 18 to 38.
Adjust so that the diameter is about mm.

Subsequently, the heater 13 of the far infrared heating furnace 12 performs the first stage heating at about 80 to 100 ° C., and the heater 15 of the high frequency heating furnace 14 performs the second stage heating at about 100 to 120 ° C. Further, the heater 17 of the far-infrared heating furnace 16 is used to perform a third stage heating at about 120 to 140 ° C. to cure and cure the inside sufficiently. In this device, gas is diffused in three furnaces.
For example, it goes without saying that a single heating furnace may be used as long as it can process gas.

An extractor having a corrugated surface which can be said to be regular and continuous on the surface of the lock bolt made of FRP of the present invention up to the above-mentioned cure, and a caterpillar shape which holds the surface of the lock bolt made of FRP from above and below. Pull out by 18 to the right as indicated by the arrow. In the puller 18 having the caterpillar shape, a large number of rubber plates protrude outside the rotating belt at equal intervals to elastically grip the target object without damaging the surface thereof.

Next, the FRP lock bolts that have been pulled out are cut into a required length by a cutting machine 19 and a fixed length FRP is cut.
Obtain the lock bolt 1 made of. Example 1 With the pulling device shown in FIG. 3, the outer diameter as shown in FIG.
A 32 mmφ FRP lock bolt was obtained.

In the drawing device, a hollow rod-shaped body 25, which is a PVC pipe (mandrel) having an outer diameter of about 16 ± 0.3 mm, an inner diameter of about 12 to 13 mm, and a wall thickness of about 1.5 to 2.0 mm, is supplied as a core material. Approximately 210 ± 10 glass fibers of about 24μ with about 4630tex of roving were used as the roving, and vinyl ester resin was used as the thermosetting resin impregnated in the roving, with respect to 100 parts of the vinyl ester resin. t-Bu
tyl peroxy-2-ethylhexanonte A resin liquid prepared by mixing about 2 parts of tyl peroxy-2-ethylhexanonte and having a viscosity of about 650 ± 20 cps. As a filamentous material, the fiber diameter is about 14μ and 1800
Using denier vinylon fiber, the winding tension is about 1.5.
About 4 kgf, it was freely adjusted and wrapped.

Further, as a far infrared heating furnace, it is about 90 ± 10 ° C.
About 100 ± 10 ° C for a high-frequency heating furnace and about 120 ± 10 ° C for a far-infrared heating furnace, a total of about 11 ± 2 minutes was cured.

Furthermore, the drawing speed of the drawing machine was about 35 ± 5 cm / min. The obtained lock bolt made of FRP has an outer diameter of about 32 mmφ, a height difference between the convex crest portion and the concave groove portion of about 0.9 ± 0.1 mm, and a ratio of the height difference value to the diameter of the concave groove portion is 0.035. ± 0.005, the pitch of the convex ridges or concave grooves is about 10 ± 1 mm, the vol% of the glass fiber is about 62%, and the tensile strength is about 85 kgf / mm ² or more. And
The tensile elastic modulus was about 500 to 700 ton f / cm ² , and the joint nuts and metal fittings could be sufficiently mounted on the surface as they were, and the desired FRP lock bolt of the present invention was obtained.

Example 2 Similar to Example 1, the pulling device shown in FIG. 3 was used to obtain a lock bolt made of FRP and having an outer diameter of about 32 mmφ as shown in FIG.

As the roving, about 130 ± 10 pieces of the same thing as in Example 1 were used, the resin liquid and the filamentous fiber material were the same as in Example 1, and only two filamentous material materials were used to form a flat belt. The spiral groove was integrally wound around the outer peripheral axial direction at intervals so as to form a flat band-shaped concave groove portion.

Curing was performed in the same manner as in Example 1 with respect to the heating temperature and the heating time, and the drawing speed of the drawing machine was set to be substantially the same as in Example 1. The obtained lock bolt made of FRP has an outer diameter of about 32 mmφ, a height difference between the convex crest and the concave groove of about 1.5 ± 0.7 mm, and a ratio of the height difference to the diameter of the concave groove of 0.055. ± 0.005, and the pitch of the convex ridges or concave grooves is about 11 ± 1 mm, the vol% of the glass fiber is about 65%, and the tensile strength is about 60 kg f / mm ² . About 1.5 to 2 of the current product
It was more than about twice as large as that, and the joint nuts and metal fittings could be sufficiently mounted on the surface as it was, and it was the intended FRP lock bolt of the present invention.

[0050]

As described above, in the FRP rock bolt of the present invention, the hollow rod-shaped body is used as the core material, and the spiral concave groove portion and the convex mountain portion adjacent thereto are continuously formed to form the convex mountain portion. And the concave groove has a height difference of 0.5 to 2.5 mm, the ratio of the height difference to the radius of the concave groove is 0.02 to 0.25, and the pitch of the convex ridges or concave grooves is 5 to 20 mm. The internal pressure resistance of the hollow part is 50 kg.
By using the FRP lock bolt with f / cm ² or more, the shape is uniquely limited, and a uniform array dispersion state is obtained within the ratio of the specified resin and long fibrous fiber material. It is possible to prevent the fiber and resin in the convex mountain portion and the concave groove portion from changing as much as possible, and the fiber itself can be covered with the resin without being exposed to the surface so that the surface is finished smoothly and the characteristics of the FRP lock bolt itself. In addition to various strength increases, a reliable and accurate screw is formed, there is no need for screwing, there is no need for screwing work, and there is no reduction in strength due to that, through the hollow rod-shaped body It is possible to inject the cement and the like in a stable and reliable and simple manner, and moreover, it is possible to directly connect it to the iron anchor bolt and to use it in combination.

Further, it has a variety of and higher performances required with a small number, and when the tunnel is being excavated or the tunnel itself, a steep cut or embankment slope with poor conditions for various ground characteristics. In addition to mountain-type construction, etc., to improve the soft ground of various underground structures such as large-scale and multi-section cities or various underground structures such as submarine underground spaces and cliffs, Needs for diversification, high strength and high performance, and ease of handling, with a stronger reinforcing material and a more effective structure than conventional FRP lock bolts that replace reinforcing steel bars, etc., to make the holding capacity more effective. The present invention provides a lock bolt made of FRP, which is useful and can be widely adopted.

[Brief description of the drawings]

FIG. 1 is a partial cutout of an FRP lock bolt of the present invention,
It is the front view which abbreviate | omits and is shown partially expanded.

FIG. 2 is a partially enlarged front view showing a lock bolt made of FRP according to another embodiment of the present invention by partially cutting away and omitting it.

FIG. 3 is a schematic view of an entire drawing apparatus of one embodiment including a partial cross section for manufacturing the FRP rock bolt of the present invention.

[EXPLANATION OF SYMBOLS] 1 FRP made Rotsukuboruto 1 'FRP-made Rotsukuboruto 2 filamentous fiber material 3 Totsujoyama portion 3' Totsujoyama unit 4 concave groove 4 'concave surface 5 side cross section 6 rovings Makitaba 7 roving 8 resin Liquid tank 9 Orientation plate 10 Mold 11 Winding machine 12 Far infrared heating furnace 14 High frequency heating furnace 16 Far infrared heating furnace 18 Extractor 19 Cutting machine 25 Hollow rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Suzuki 3-7-1, Kanda Nishikicho, Chiyoda-ku, Tokyo Central Glass Co., Ltd. (72) Inventor Yoshiaki Kamikawa 3-7-1, Kandanishiki-cho, Chiyoda-ku, Tokyo Within Central Glass Co., Ltd.

Claims (6)

[Claims] 1. A FRP rock bolt comprising a long fibrous fiber material, a thermosetting resin, and a hollow rod-shaped body, wherein the hollow rod-shaped body is used as a core material and is impregnated with the thermosetting resin, and the rod-shaped length is continuous in the longitudinal direction. On the surface of the fibrous fibrous material, the filamentous fibrous material is spirally wound around the outer peripheral axial direction at intervals and tightened up, and the threaded fibrous material part wound up and wound up has a spiral groove groove, And the convex crests are formed between the spaces between the adjacent spiral concave grooves, and the height difference between the convex crests and the concave groove is 0.5 to 2.5 mm, and the radius of the concave groove is The ratio of the height difference to 0.02 to 0.25, and the pitch of the convex peaks or concave grooves is 5 to 20.
A rock bolt made of FRP, which is formed by repeatedly and continuously hardening so as to have a diameter of 50 mm, and has an internal pressure resistance of 50 kgf / cm ² or more in the hollow rod-shaped body. 2. The rock bolt made of FRP according to claim 1, wherein the long fibrous fiber material is glass fiber. 3. The lock bolt made of FRP according to claim 1, wherein the lock bolt made of FRP has a surface coated with a thermosetting resin. 4. The FRP rock bolt according to claim 1, wherein the thermosetting resin is an unsaturated polyester resin, a vinyl ester resin or an epoxy resin. 5. The lock bolt made of FRP has an outer shape 32.
A lock bolt made of FRP according to any one of claims 1 to 4, which is connectable to an iron anchor bolt of mm. 6. The lock bolt made of FRP has a tensile strength of 20 ton f (52 kg f / mm ² ) or more and a screw shear strength of 17 tons.
The rock bolt made of FRP according to any one of claims 1 to 5, which has a ton f or more.