JPH11280395A - Male thread part of resin-made lock-bolt, its formation method, resin-made lock-bolt and long lock-bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid lowering of strength and easily manufacture a resin-made lock bolt with a male thread by winding a continuous fiber bundle on the outer periphery of the resin-made lock-bolt body just after molding to be integrated and making it a male thread part. SOLUTION: A number of glass long fiber bundles 5 are introduced in a melting resin tank 6 to impregnate thermosetting melting resin, impregnated resin amount is adjusted by a squeezer 7 or the like, uncured or semi-cured lock bolts 1 are continuously molded by a drawing molding die 8. A continuous fiber bundle 2 impregnated with resin is wound at prescribed pitches by a winding machine 2a, and integrated with the lock bolt 1 by pressing, heating or the like on a finishing part 9 to be made a male thread part. Furthermore, the continuous fiber bundle 2 is made the core material of a screw thread, and resin may be applied thereon by injection molding. Thereby lowering of strength by cutting work or the like is avoided, and the resin-made lock bolt with the male thread can be easily manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a male screw portion of a resin lock bolt, a method of forming the male screw portion, a resin lock bolt, and an elongated lock bolt.

[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. In recent years, they are difficult to transport and handle because they are heavy, rusting in the soil causes strength deterioration, and temporary rock bolts that are used for a short time can easily damage cutting equipment during subsequent excavation. Has attracted attention for resin lock bolts.

The length of the lock bolt is usually 3 m or more.
The length is about 4 m, but recently, due to improvements in tunnel excavation equipment, it is often required to drive rock bolts deeper than before in order to shorten the construction period. In such a case, an excessively long lock bolt is inconvenient for transportation by a transport vehicle and handling at the site. It is common to use a threaded connection and use it as an elongated lock bolt (in the case of a pipe-type lock bolt, an external thread portion is sometimes used to connect a chemical solution injection hose).

[0004] As a conventional technique of a resin lock bolt provided with a male screw portion, a lock bolt body end is inserted into an injection mold, and a resin male screw portion is injection-molded on the outer periphery thereof. A male screw part formed by cutting the end of a lock bolt body, a male screw body made of a resin separately formed, attached to the end of the lock bolt body from the axial direction and bonded, two metal There is a method in which a thin plate is pressed into a semi-cylindrical male screw shape, and these are then applied to the outer periphery of the end portion of the lock bolt body by welding and caulking to form a male screw portion.

[0005]

However, in the above-mentioned prior art, the bonding strength between the male screw portion and the lock bolt main body is weak, so that the bonding surface is easily separated and separated. As a result, the long lock bolt is likely to be cut halfway.

[0006] In the above-mentioned prior art, the wall thickness of the male screw portion is reduced by cutting the male screw portion, and the strength of the lock bolt body is reduced. When the lock bolt is made of a so-called FRP resin, the cut surface of the reinforcing glass fiber in the cut portion is exposed to the strong alkaline mortar or alkaline soil water of the fixing material that has penetrated into the threaded portion. In addition, strength reduction due to alkali deterioration of glass fibers is also likely to occur.

In the above-mentioned prior art, since the male screw portion and the lock bolt main body are bonded in the axial direction, they are easily separated from each other due to a shortage of the joint area. Is easy to invite.

[0008] The above-mentioned prior art is expensive in terms of man-hours and materials. In addition, since accurate welding and caulking are difficult, the dimensions of the male screw portion vary, and the screw connection by a joint is easily hindered.

Accordingly, the present invention provides a male screw portion of a resin lock bolt which does not have the above-described problems and an effective method of forming the male screw portion, a resin lock bolt provided with such a male screw portion, and a longer length using the same. To provide lock bolts,
Issues to be solved.

[0010]

Means for Solving the Problems (Structure of the First Invention) The structure of the first invention of the present application (the invention as set forth in claim 1) for solving the above-mentioned problems is a resin-shaped lock bolt made of a pipe or rod. At one end, both ends, or the entire length of the outer periphery, the male screw having a thread formed by helically winding a continuous fiber bundle around the resin lock bolt body. Male screw portion of a resin lock bolt.

(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.
One end, both ends, or an external thread over the entire length of the pipe-shaped or rod-shaped main body of the resin lock bolt, and the male thread is formed by spirally winding the continuous fiber bundle on the resin lock bolt main body. A male screw portion of a resin lock bolt, which is wound and fixed to form a core material of a screw thread and has a screw thread formed by applying a resin material to the core material.

(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.
A continuous fiber bundle is spirally wound with a fixing means around one end, both ends or the entire length of the resin-made lock bolt in a pipe-shaped or rod-shaped main body, or a resin material is further applied thereto. , The first invention or the second invention
It is a forming method of the male screw part which forms the male screw part of the invention.

(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.
As a fixing means in the third invention, after winding a continuous fiber bundle impregnated with resin in advance around the lock bolt body,
This is a method for forming a male screw portion, which solidifies the resin.

(Structure of Fifth Invention) The structure of the fifth invention (the invention according to claim 5) for solving the above-mentioned problem is as follows.
The fixing means according to the third aspect of the present invention is a method for forming a male thread portion, wherein a continuous fiber bundle is wound in a bite state around an unsolidified or semi-solidified lock bolt body.

(Structure of the Sixth Invention) The structure of the sixth invention (the invention according to claim 6) for solving the above problems is as follows.
A resin lock bolt comprising the male screw portion of the first to third inventions on one end, both ends, or the entire length of the outer periphery of the pipe-shaped or rod-shaped main body of the resin lock bolt.

(Structure of Seventh Invention) The structure of the seventh invention of the present application (the invention according to claim 7) for solving the above problems is as follows.
The lock bolt body according to the sixth aspect of the present invention is obtained by impregnating a glass long fiber bundle with a resin and performing drawing molding.
This is a resin lock bolt.

(Structure of Eighth Invention) The structure of the eighth invention (the invention according to claim 8) for solving the above problems is as follows.
An elongated lock bolt in which the resin lock bolt according to the sixth or seventh invention is screwed and connected via a joint.

[0018]

[Operation and Effect of the Invention] (Operation and Effect of the First Invention) In the first invention, since the thread of the external thread portion is constituted by the fixed continuous fiber bundle, the thread is worn or chipped. hard. Further, by selecting an appropriate fixing means for the continuous fiber bundle, a large joining force between the male screw portion and the lock bolt main body can be secured. Further, since the continuous fiber bundle does not have a cut section, it is stable against chemical deterioration.

(Function / Effect of the Second Invention) In the second invention, since the resin material is applied to the continuous fiber bundle wound and fixed helically to form a male thread portion, the first thread is formed. Similarly to the invention, the toughness of the thread and the joining force between the male thread portion and the lock bolt main body can be secured, and the appropriate height and cross section of the thread can be secured by appropriately designing the thickness and cross-sectional shape of the applied resin. The shape can be arbitrarily designed. Further, by attaching the resin, the joining force between the male screw portion and the lock bolt main body can be further increased.

(Operation and Effect of Third Invention) In the third invention, the external thread portion of the resin lock bolt is formed by spirally winding and fixing a continuous fiber bundle, or by further applying a resin material to this. Since it is formed, it can be processed easily and at low cost. Further, the processing does not cause a decrease in the tensile strength or the like of the lock bolt body. (Function / Effect of the Fourth Invention) In the fourth invention, since the continuous fiber bundle is impregnated with resin and wound around the lock bolt main body, the solidified resin is used to fix particularly between the male screw portion and the lock bolt main body. Strong bonding force can be realized.

(Function / Effect of the Fifth Invention) In the fifth invention, since the continuous fiber bundle is wound around the lock bolt main body in a biting state, the male screw portion is different from the fourth invention. A particularly strong joining force with the lock bolt body can be realized. (Function / Effect of Sixth Invention) According to the sixth invention, the first
A resin lock bolt with a male screw portion having the features of the invention to the third invention is provided.

(Function / Effect of the Seventh Invention) In the seventh invention, since the lock bolt body is a so-called FRP high-strength resin lock bolt, the features of the first to third inventions are provided. The practical value of forming an external thread is particularly high. Further, as will be described later, an efficient manufacturing method of simultaneously performing the drawing of the lock bolt body and the formation of the male screw portion can be realized.

(Effects and Effects of the Eighth Invention) According to the eighth invention, there is provided an excellent elongated lock bolt in which a resin lock bolt with a male screw portion having the above-described features is screwed through a joint. Is done.

[0024]

Next, embodiments of the first to eighth inventions will be described. In the following, simply "the present invention"
When it says, it points out 1st invention-8th invention collectively.

[Resin Lock Bolt] The main part of the resin lock bolt of the present invention is made of any thermoplastic resin or thermosetting resin, as well as various reinforcing materials and additives. The molding method also includes various known molding methods such as, for example, an extrusion molding method and a pultruding method in which a long glass fiber bundle is impregnated with a resin and is drawn / compressed.
The lock bolt body may be a hollow pipe or a solid rod.

[Male thread portion] In the first invention, the male thread portion is formed by a continuous fiber bundle spirally wound and fixed on the outer peripheral portion of the lock bolt main body. The bundle is formed as a threaded core material, and a resin material is applied to the core material.

These male thread portions need to be formed with a winding pitch that matches the pitch of the female thread of the lock bolt joint (nut type). It is sufficient that the male screw portion is formed essentially at one or both ends in the axial direction of the lock bolt main body, but is formed over the entire length of the lock bolt main body in the axial direction for the convenience of the forming process and other reasons. It does not matter.

The male screw portion is spirally wound around the outer periphery of the lock bolt body and is fixed by an appropriate fixing means. As a typical example of such a fixing means, as in the fourth invention, a continuous fiber bundle is impregnated with a resin, wound around a lock bolt main body, and fixedly adhered by solidifying the resin. In this case, if the resin is a thermoplastic resin, an adhesive fixing effect is generated by cooling and solidifying the resin, and if the resin is a thermosetting resin, a heat curing treatment is performed after winding a continuous fiber bundle to perform an adhesive fixing effect. Can be caused. In order to increase the adhesive fixing effect, it is more preferable to select a resin having a large bonding force with the resin used for the lock bolt body, for example, the same resin.

Another representative example of the fixing means is that the continuous fiber bundle is wound around the unsolidified or semi-solidified lock bolt body as in the fifth invention, so that the continuous fiber bundle is bite-fixed to the outer peripheral portion of the lock bolt body. It is to make it. Here, the “un-solidified or semi-solidified state” of the lock bolt main body refers to a state of incomplete cooling and solidification of the lock bolt main body using a thermoplastic resin or an incomplete state of heat curing of the lock bolt main body using a thermosetting resin. Say the state.

When the continuous fiber bundle is wound around the unsolidified or semi-solidified lock bolt body, for example, the continuous fiber bundle is wound while applying a tensile force, or the continuous fiber bundle is compressed after being wound. In the case of a method of compressing with a mold, it is possible to fix the bite particularly well. When the lock bolt body is formed by drawing, the continuous fiber bundle is wound before the solidification or heat solidification thereof, whereby the solidification of the molded body of the lock bolt body and the bite fixing of the continuous fiber bundle can be simultaneously performed. .

In the case where the continuous fiber bundle is impregnated with a resin and is wound with a certain tension around the unsolidified or semi-solidified lock bolt body (when the fourth and fifth inventions are carried out simultaneously) In addition, the bonding and fixing effect of the resin and the biting and fixing effect of the continuous fiber bundle are synergistic, so that a particularly strong bonding force can be provided between the male screw portion and the lock bolt body.

Other fixing means can be employed if they are effective. For example, as in the second invention, the application of the resin material to the spirally wound continuous fiber bundle not only has the effect of adjusting the shape of the thread, but also the fixing strength of the continuous fiber bundle to the lock bolt body. It is also possible to previously form a scratch on the outer peripheral surface of the lock bolt main body to increase frictional resistance, or to provide a guide groove for fixing a continuous fiber bundle.

[Continuous Fiber Bundle] As the type of the continuous fiber bundle, for example, a fiber bundle made of long fiber filaments, a twisted string, or a rope is used. In particular, those using a long glass fiber filament or a long carbon fiber filament are preferable. It is more preferable to use a twisted cord or even a rope-shaped fabric than a simple fiber bundle in terms of strength and firmness as a thread.

[Process of Forming External Thread] It is particularly preferable that the process of forming the external thread is performed by the method of the fourth or fifth aspect of the present invention. It does not matter if the content is such that the fiber bundle is spirally wound under predetermined fixing means.

In the second invention, a resin material is further adhered to the wound continuous fiber bundle, but there is no limitation on the means for applying the resin material. For example, the lock bolt body wound with the continuous fiber bundle is used in an injection mold. A resin coating layer may be formed by insertion, or a simple method of simply coating the molten resin by spraying or the like may be used.

[0036]

Next, an embodiment of the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 1 shows a male thread portion of a resin lock bolt according to the first invention, which is provided on the outer periphery of a cylindrical pipe type lock bolt body 1 (which may be a solid round bar type). The continuous fiber bundle 2 is wound and fixed at a winding pitch matching the female thread of the nut type joint.

The pipe-shaped lock bolt body 1 is made of an arbitrary material by an arbitrary molding method. For example, the lock bolt body 1 is made of a resin or a short glass fiber reinforced resin by an extrusion molding method, or is formed by a pultrusion molding method. It may be made of FRP. The continuous fiber bundle 2 is a rope having an appropriate thickness formed by knitting and weaving a fiber bundle composed of glass filament fibers.

As can be seen from FIG. 2 showing an enlarged cross section of the main part of FIG. 1, the continuous fiber bundle 2 has a groove 3 formed on the outer peripheral portion of the lock bolt body 1 so that a necessary fixing force can be obtained and the continuous fiber bundle 2 The part is bitten and fixed to such a depth that an effective thread can be formed. When the liquid thermosetting resin impregnated in the continuous fiber bundle 2 is cured, the continuous fiber bundle 2 is provided with sufficient hardness and a part of the cured resin is strengthened by solder-like joining in metal welding. The portion 4 is formed, and the continuous fiber bundle 2 is adhesively fixed to the lock bolt body 1.

(Embodiment 2) FIG. 3 shows a method for manufacturing a resin lock bolt (made of FRP) with a male screw portion according to Embodiment 1.

In the figure, first, a number of long glass fiber bundles 5 are passed through a molten resin tank 6 to be impregnated with a thermosetting molten resin, and the amount of the impregnated resin is adjusted by a squeeze 7 or the like, and then a drawing mold is used. 8 to continuously form the unsolidified or semi-solidified lock bolt body 1. At this time, when the lock bolt main body 1 is in a pipe shape, the lock bolt body 1 is formed into a pipe shape having a required thickness by using a core rod (not shown). Next, while feeding the lock bolt body 1, a continuous fiber bundle 2 impregnated with resin is wound so as to have a predetermined winding pitch using a winding machine 2a. A continuous body of resin lock bolts with external thread portions is formed by applying compressive force and / or heat. After that, it is cut at predetermined lengths by a cutter or the like (not shown). The continuous thread bundle 2 may be intermittently wound by using a known appropriate means to form a male screw portion only at one end or both ends of the lock bolt body 1.

(Embodiment 3) FIG. 4 shows one end of an embodiment of a resin lock bolt according to the second invention, which is continuous on the outer periphery of a lock bolt body 1 similar to the first embodiment, similarly to the first embodiment. The fiber bundle 2 is wound and fixed, and a resin layer 10 (shown in a cross-sectional state) is adhered to these surfaces with an appropriate thickness that does not reduce the effect of the continuous fiber bundle 2 as the thread core material. Have been. The resin layer 10 is formed by inserting an end of the lock bolt body 1 around which the continuous fiber bundle 2 is wound and fixed into a screw mold for injection molding, and injecting a resin onto the outer peripheral surface thereof. is there.

In this embodiment, the continuous fiber bundle 2 constitutes the core of the thread, and the resin layer 10 applied thereto constitutes the outer shape of the thread and joins the thread to the lock bolt body 1. Strength has been increased.

(Embodiment 4) FIG. 5 shows an elongated lock bolt 11 according to an eighth aspect of the present invention. Of the thread 12 of the nut type joint 13
(Shown in cross-section) by being screwed together to make it longer.

[Brief description of the drawings]

FIG. 1 is a view showing a male thread portion of a resin lock bolt according to an embodiment.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a diagram illustrating an example of a method for manufacturing a resin lock bolt according to the embodiment.

FIG. 4 is a view showing a male screw portion of the resin lock bolt according to the embodiment.

FIG. 5 is a view showing an elongated lock bolt according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lock bolt main body 2 Continuous fiber bundle 10 Resin layer 12 Thread 13 Nut type joint

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koshiro Hayashi 1-2-27 Miyashita, Sagamihara City, Kanagawa Prefecture Asahi Glass Matex Co., Ltd. (72) Inventor Haruo Gonda 4--11-26 Nishirougo, Ota-ku, Tokyo Inside the corporation

Claims (8)

[Claims] 1. A male screw portion provided at one end, both ends, or the entire outer circumference of a resin-made lock bolt in a pipe-shaped or rod-shaped main body, and the male screw portion is connected to the resin-made lock bolt main body by a continuous fiber. A male thread portion of a resin lock bolt, comprising a thread formed by spirally winding and fixing a bundle. 2. A male thread portion provided at one end, both ends, or the entire outer circumference of a resin-made lock bolt in a pipe-shaped or rod-shaped main body, wherein the male thread portion is formed of a continuous fiber on the resin-made lock bolt body. A male thread portion of a resin lock bolt, wherein the bundle is helically wound and fixed to form a thread core, and a thread formed by applying a resin material to the core is provided. . 3. A continuous fiber bundle is spirally wound with a fixing means around one end, both ends, or the entire circumference of a pipe-shaped or rod-shaped main body of a resin-made lock bolt, or a resin material is further wound therearound. 3. A method for forming a male screw portion according to claim 1 or 2, wherein the male screw portion is formed. 4. The male screw part according to claim 3, wherein, as the fixing means, a continuous fiber bundle impregnated with resin in advance is wound around a lock bolt body, and then the resin is solidified. Forming method. 5. The formation of the external thread portion according to claim 3, wherein the fixing means winds a continuous fiber bundle in a bite state around an unsolidified or semi-solidified lock bolt body. Method. 6. A male or female screw portion according to claim 1, which is provided at one end, both ends, or the entire circumference of the resin-made lock bolt in a pipe-shaped or rod-shaped main body. Lock bolt made of resin. 7. The resin lock bolt according to claim 6, wherein the lock bolt main body is formed by impregnating a resin into a glass filament bundle and drawing the resin. 8. An elongated lock bolt, wherein the resin lock bolt according to claim 6 or 7 is screwed and connected via a joint.