JPH11280398A - Resin lock bolt and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture an FRP-made lock-bolt with improved fixing strength with a fixing material by fixing solid particles such as silica sand on the outer periphery of the FRP-made lock-bolt with a binder to form uneven shape. SOLUTION: A number of rovings 4 comprising a long glass fiber bundle is introduced in a first melting resin tank 5 to impregnate thermosetting melting resin A, and a lock bolt core material 7 is formed by an auxiliary mold 6. The other roving 8 is introduced in a second melting resin tank 9 to impregnate the melting resin A, silica sand B as solid particles B or the like, disposed on the circumference of the lock bolt core material 7 to constitute a lock bolt raw material 10, molding and thermosetting are performed by a press molding mold 11, and an FRP-made rock bolt 12 with the silica sand B fixed on the outer peripheral face is manufactured. In addition, the melting resin A and the silica sand B may be alternately sprayed on the outer periphery of the lock bolt core material 7. Thereby uneven shape is easily formed on the outer periphery of the FRP-made lock bolt 12, and fixing strength can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin lock bolt and a method of manufacturing the same, and more particularly, to a resin lock bolt having an uneven surface formed on an outer peripheral surface thereof for improving fixing strength to the ground and a method of manufacturing the same. .

[0002]

2. Description of the Related Art A rock bolt is a reinforcing material used for reinforcing a ground together with a fixing material in excavation of a tunnel or the like. In the past, metal rock bolts made of steel bars or steel pipes were mainly used. Recently, resin lock bolts, especially FRP lock bolts with excellent tensile strength, have been used because of their excessive weight, rusting in the soil, and possibly damaging tunnel excavation equipment. Is attracting attention.

[0003] In general, these lock bolts are required to have a fixing strength (force to strongly adhere to the fixing material and resist removal) to the ground where the rock bolts are cast in addition to the strength of the rock bolt itself. It is advantageous to form an uneven shape on the outer peripheral surface of the lock bolt.

[0004] Compared with metal lock bolts, resin lock bolts are easier to form and form irregularities, including post-processing, and are easier to mount other members to provide irregularities. Attempts have been made to form irregularities on the outer surface of a resin lock bolt by various methods.

For example, in the invention disclosed in Japanese Patent Application Laid-Open No. Sho 61-235115, a lock bolt made of FRP having various surface projections as shown in FIG. Has been manufactured.

In the invention according to Japanese Patent Publication No. 56-23040, as shown in FIG. 1 of the publication, a rope-shaped reinforcing fiber is wound and fixed on the outer peripheral surface of an FRP lock bolt, and the unevenness of the rope is obtained. Thus, the fixing strength of the lock bolt is improved.

In addition, a spiral or circumferential groove is formed on the outer peripheral surface of the lock bolt by cutting, a fiber mat is attached to the entire outer periphery of the lock bolt, or a cloth material or the like is provided on the outer peripheral surface of the lock bolt. Is applied in a spiral or helical spiral winding.

[0008]

However, Japanese Patent Application Laid-Open No.
Japanese Patent Publication No. 1-235115 and Japanese Patent Publication No. Sho 56-2304
In the invention disclosed in Japanese Patent Publication No. 0, the step of forming the uneven shape is complicated and costly, and the above-mentioned cutting method involves problems such as a decrease in the strength of the lock bolt body and an alkali deterioration of the exposed reinforcing glass fiber. In addition, the method of applying the mat or the cloth has problems such as insufficient improvement in fixing strength due to insufficient degree of unevenness or insufficient standing angle of the uneven shape. .

Accordingly, an object of the present invention is to provide a means for forming a concave and convex shape effective for improving the fixing strength in a resin lock bolt, particularly an FRP lock bolt, in a very simple and inexpensive manner. .

[0010]

Means for Solving the Problems (Structure of the First Invention) The structure of the first invention of the present application (the invention of claim 1) for solving the above problems is a pipe-shaped or rod-shaped resin lock bolt. And a resin lock bolt having an irregular shape formed by solid particles fixed to the outer peripheral surface thereof by a binder.

(Structure of the Second Invention) The structure of the second invention of the present application (the invention according to claim 2) for solving the above problems is as follows.
The resin lock bolt according to the first aspect of the invention is a resin lock bolt obtained by impregnating a glass long fiber bundle with a resin and performing drawing.

(Structure of Third Invention) The structure of the third invention (the invention according to claim 3) for solving the above-mentioned problem is as follows.
This is a method for manufacturing a resin lock bolt, in which solid particles are fixed to an outer peripheral surface of a pipe-like or rod-like resin lock bolt using a binder.

(Structure of Fourth Invention) The structure of the fourth invention (the invention described in claim 4) for solving the above-mentioned problem is as follows.
A method for manufacturing a resin lock bolt, wherein solid particles are fixed to an outer peripheral surface of the resin lock bolt by any one of the following means in a method of drawing a resin lock bolt. (1) The molten resin to be impregnated into the glass filament bundle contains solid particles. (2) Impregnating the molten glass containing solid particles into the glass long fiber bundle that constitutes the outer peripheral surface layer of the resin lock bolt. (3) After the solid particles are adhered to the outer peripheral surface of the uncured rock bolt material (in which the lock bolt prototype has been formed and the molding and / or curing has not been completed) together with the molten resin, The hardened rock bolt material is hardened.

[0014]

Operation and effect of the invention] (Operation and effect of the first and third inventions)
Effect) According to the first invention and the third invention, it is possible to easily and inexpensively form an arbitrary uneven shape corresponding to a required fixing strength.

That is, the frequency of irregularities in the irregular shape is selected by selecting the amount of solid particles used, the degree of irregularity in the irregular shape is selected by selecting the particle size of the solid particles, and the rising angle of the irregular shape is selected by selecting the shape of the solid particles. Further, the fixing strength of the uneven shape can be arbitrarily set by selecting the bonding strength of the binder.

This method is very simple as a process, and the production cost can be extremely easily reduced by arbitrarily selecting inexpensive solid particles and a binder that meet the above various options. Further, there is no danger of the strength of the resin lock bolt being reduced and the deterioration of the glass fiber being caused by the formation of the uneven shape.

(Functions and Effects of the Second and Fourth Inventions) In the second and fourth inventions, a so-called FRP lock bolt in which a glass long fiber bundle is impregnated with a resin and drawn is formed. Since it is formed, the fixing strength matches the original tensile strength of the FRP lock bolt, and an excellent FRP lock bolt can be provided.

Further, in the fourth invention, the above (1) to (3)
In the case of using any of the means, the molten resin originally used for molding / curing of the lock bolt body is also used as a binder for solid particles. Is also formed, which is extremely advantageous in terms of manufacturing efficiency and cost.

[0019]

Next, embodiments of the first to fourth inventions will be described. In the following, simply "the present invention"
When it says, it points to 1st invention-4th invention collectively.

[Resin Lock Bolt] The resin lock bolt of the present invention includes a hollow pipe shape or a solid rod shape, and the cross-sectional shapes of both types are not limited.
For example, a circle, a square such as a square or a hexagon, or any other cross-sectional shape is included.

The method of forming the resin lock bolt is not limited, and a typical one is an FRP lock bolt formed by impregnating a long glass fiber bundle with a resin and drawing it. It may be formed by molding or may be injection-molded in some cases.

The constituent material of the resin lock bolt is not limited. For example, even if a thermoplastic resin such as a vinyl chloride resin, a polycarbonate resin, or a polypropylene resin is used, a thermosetting resin such as an epoxy resin, a phenol resin, or an unsaturated polyester resin may be used. A material using a curable resin may be used. In the resin,
Glass long fiber like the case of FRP lock bolt,
Short glass fibers and other optional reinforcing materials and various additives may be included.

[Solid Particles] The material, shape, particle size, etc. of the solid particles are not limited as long as an effective uneven shape can be formed. As for the material, use ceramic materials such as silica sand or glass particles, organic materials such as resin particles, and metal materials of non-rusting (or rusting if rusting is not considered). Can be used arbitrarily.

Since the shape of the irregularities is basically determined by the shape of the solid particles, if it is desired to avoid the uneven shape having a gentle and small rising angle, the solid particles having a small aspect ratio, for example, spherical or angular solid particles (For example, silica sand, glass beads, resin beads, etc.) are preferred. It is also preferable to use solid particles of various shapes in combination to change the pattern of the uneven shape.

Since the degree of unevenness is basically determined by the particle size of the solid particles, it is preferable to select solid particles having an appropriate particle size according to the purpose. As an example, 0.
Solid particles having a particle size of about 1 to 5 mm can also be used. Solid particles having an arbitrary particle size distribution may be used unavoidably in order to avoid the trouble of separating the particle size, or intentionally having large and small variations in the uneven shape.

Since the amount of solid particles used defines the frequency of unevenness of the uneven shape, it is preferable to select an appropriate amount according to the purpose.

[Binder] The type and amount of the binder are not limited, and any binder having an arbitrary adhesive strength may be used in connection with the required fixing strength of the solid particles and the amount of the solid particles used. As the binder, those commonly used as an adhesive may be used, or as in the second and fourth inventions,
A molten resin (for example, a thermosetting molten resin) used for forming / hardening the RP lock bolt may be used as the binder.

[Method of Forming Concavo-convex Shape] As a method of fixing the solid particles to the resinous lock bolt by the binder, any possible method can be adopted. An example of the characteristic and representative method is the fourth invention. As another method, a resin lock bolt (FR) is added to a binder liquid mixed with solid particles.
(P lock bolts are also included) and dipped and pulled up to solidify the binder or, if necessary fluidity can be secured, spray or apply the binder liquid mixed with solid particles to the resinous lock bolts Can also be solidified.

Further, the application of the binder liquid and the adhesion of the solid particles are performed in two steps, and thereafter, for the purpose of improving the fixing strength and / or preventing the rust-forming metallic solid particles from rusting,
A binder liquid can also be coated.

In the method of the fourth invention, the method of pull-forming the FRP lock bolt may be a method in which an uncured lock bolt material is molded in a molding die and then cured in a thermosetting bath, or the uncured lock bolt material may be uncured by a heat molding die. A method of simultaneously performing the molding of the rock bolt material and the thermosetting may be used. In the latter case, the heat molding die may be one that performs compression molding.

As the molten resin, any kind of molten resin for molding / curing the lock bolt body in the draw molding of the FRP lock bolt can be used.

As is apparent from the means (1) and (2) of the fourth invention, all the long glass fiber bundles constituting the FRP lock bolt may be impregnated with a molten resin containing solid particles. Then, only the glass fiber bundle constituting the outer peripheral surface layer of the rock bolt may be impregnated with the molten resin containing the solid particles. In the latter case, it is preferable to impregnate other glass fiber bundles with a molten resin containing no solid particles.

In the means (3) of the fourth invention, the method of adhering the solid particles (a) together with the molten resin (b) may be, for example, in the order of (b) → (a) → (b) A typical method is to spray or apply the particles and to spray or dust the solid particles, but it is also possible to omit the first step or the third step (b). If necessary fluidity can be secured, a molten resin containing solid particles may be sprayed or applied.

In the present invention, the solid particles are fixed by the binder (molten resin) when the solid particles are sprayed / sprayed after the binder is applied to the outer peripheral surface of the lock bolt as shown in FIG. Then, the solid particles 1 are fixed to the surface of the lock bolt 3 in a state where the base is fixed by the binder 2, and a binder containing the solid particles is applied to the outer peripheral surface of the lock bolt, or the binder is coated as a post-process. In this case, as shown in FIG. 2, the solid particles 1 are fixed to the surface of the lock bolt 3 in a state where the solid particles 1 are entirely covered and fixed by the binder 2. The relative fixing strength of the solid particles is better in the case of FIG.

[0035]

Next, as an embodiment of the present invention, examples of manufacturing FRP lock bolts 2 and 3 having solid particles fixed to the outer peripheral surface will be described with reference to the drawings.

(Embodiment 1) In FIG. 3, a large number of rovings 4 made of a long glass fiber bundle are first introduced into a first molten resin tank 5 containing a thermosetting molten resin A such as an epoxy resin. Then, the molten resin A is impregnated. Then
If necessary, the amount of impregnated resin is adjusted with a squeeze or the like (not shown), and then a large number of rovings 4 impregnated with molten resin A are bundled and preformed in a preforming mold 6 into, for example, a rod-shaped core material. 7 is formed.

On the other hand, a large number of rovings 8 are separately introduced into a second molten resin tank 9 containing a thermosetting molten resin A containing silica sand B and impregnated with A + B molten resin. The molten resin impregnated rovings 8 to which the silica sand B has adhered are aligned by a suitable alignment device (not shown) so as to surround the periphery of the lock bolt core material 7 to form the lock bolt material 10. When the bolt material 10 is formed and heat-cured by a press forming die 11 having a heating function, it becomes an FRP lock bolt 12 having silica sand B fixed to the outer peripheral surface.

The above process is progressing by the pulling of the take-up device 13, and after the FRP lock bolt 12 is further taken to the right in the drawing by the take-up device 13, a predetermined length is set by a cutter (not shown). Is cut off.

(Embodiment 2) In FIG. 4, as in Embodiment 1, a large number of rovings 4 are introduced into a molten resin tank 5 containing a thermosetting molten resin A, and impregnated with the molten resin A. Next, after adjusting the amount of the impregnated resin as necessary, a lock bolt material 15 having a predetermined cross-sectional shape is
To form

The molten resin A is uniformly sprayed on the lock bolt material 15 by the first nozzle 16, and the silica sand B stored in the hopper 17 is evenly sprayed or dusted by appropriate means (not shown). wear.

Further, after the molten resin A is uniformly sprayed by the second nozzle 18 to complete the process of attaching the silica sand B, the molten resin A is introduced into the thermosetting tank 19, and the molten resin A is thermally cured, thereby locking the resin. The hardening of the bolt material 15 and the fixing of the silica sand B are completed at the same time. After that, it is taken out and cut into a predetermined length in the same manner as in the first embodiment.

(Embodiment 3) In FIG. 5, a large number of rovings 4 are introduced into a molten resin tank 20 containing a molten resin A containing silica sand B, and are impregnated with A + B molten resin. The molten resin impregnated rovings 8 to which the silica sand B has been adhered are adjusted, if necessary, in an amount of impregnated resin, and are then bundled and formed into a lock bolt material 22 having a predetermined cross-sectional shape by a molding die 21. Therefore, in the lock bolt material 22,
Silica sand B is contained inside and adheres to the surface.

The lock bolt material 22 is transferred to a thermosetting tank 23.
Then, the molten resin A is thermally cured to complete the curing of the lock bolt material 22 and the fixing of the silica sand B at the same time. After that, taking over in the same manner as in Example 1,
Cut to length.

[Brief description of the drawings]

FIG. 1 is a view showing a mode of fixing solid particles.

FIG. 2 is a view showing a mode of fixing solid particles.

FIG. 3 is a diagram illustrating a method for manufacturing a resinous lock bolt according to an example.

FIG. 4 is a diagram illustrating a method for manufacturing a resinous lock bolt according to an example.

FIG. 5 is a diagram showing a method for manufacturing a resinous lock bolt according to an example.

[Description of Signs] 1 Solid particles 2 Binder 3 Rock bolt 4,8 Roving 7 Rock bolt core material 10,15,22 Lock bolt material 12 Lock bolt A Molten resin B Silica sand

Claims (4)

[Claims] 1. A resin-made lock bolt in which a pipe-shaped or rod-shaped resin-made lock bolt is formed with a concavo-convex shape in which solid particles are fixed by a binder on an outer peripheral surface thereof. 2. The resin lock bolt according to claim 1, wherein the resin lock bolt is formed by impregnating a glass filament bundle with a resin and drawing the resin bundle. 3. A method for manufacturing a resin-made lock bolt, wherein solid particles are fixed to an outer peripheral surface of a pipe-shaped or rod-shaped resin-made lock bolt using a binder. 4. A method for manufacturing a resin lock bolt, wherein solid particles are fixed to an outer peripheral surface of the resin lock bolt by any one of the following means in a method of drawing a resin lock bolt. (1) The molten resin to be impregnated into the glass filament bundle contains solid particles. (2) Impregnating the molten glass containing solid particles into the glass long fiber bundle that constitutes the outer peripheral surface layer of the resin lock bolt. (3) After the solid particles are adhered to the outer peripheral surface of the uncured rock bolt material together with the molten resin, the uncured rock bolt material is cured.