JP2003293302A - Method of re-driving dog-spike or screw spike into sleeper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a screw spike or the like newly driven into a sleeper after track adjustment work, etc., to have sufficient pull-out resisting strength even if rain water has penetrated in the sleeper and to make related work execution easy. <P>SOLUTION: A un hardened fast-hardening resin compound 6 having short fibers mixed in and not foaming through reaction with water is filled and hardened in a hole 5 left after removing a dog-spike 4' or screw spike 4 driven into a sleeper 3 made of a fiber-reinforced thermosetting-resin foaming material, another dog-spike or screw-spike base-hole 9 is drilled again, and then the dog-spike 4' or screw spike 4 is driven there. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for re-driving dog nails or screw nails on a sleeper, and more specifically, a rail rail track using a sleeper made of a thermosetting resin foam reinforced with glass fibers. The present invention relates to a method of re-driving screw nails or dog nails to a sleeper when re-driving nails for correction.

[0002]

2. Description of the Related Art As a conventional retouching method of this type, there is one disclosed in Japanese Patent No. 3212504, for example. In the re-strike method described in the publication, when the screw nail position is slid within the range of the diameter to correct the track of the rail, and is struck again, it is driven into a sleeper made of a thermosetting resin foam reinforced with glass fibers. The hole left after removing the screw nail was filled with a urethane resin containing an adsorbent with excellent hygroscopicity and carbon dioxide adsorption, a curing agent made of polyisocyanate and a curing catalyst, and cured, and the pilot hole for the screw nail was re-established. After drilling, the screw nails are tightened.

[0003]

In the above-mentioned conventional retouching method, the urethane resin which is cured in a short time within 10 minutes is used, but by using the adsorbent excellent in hygroscopicity and carbon dioxide adsorption, Although it is intended to prevent the foaming of the sleeper, especially in the case of construction after rain, the sleeper contains a large amount of water, and the thermosetting resin foam has lower hygroscopicity than natural wood, If a hole is present, a relatively large amount of water will seep into the hole, so that foaming cannot be suppressed sufficiently, and the urethane resin will foam at the boundary between the filled urethane resin and the peripheral wall of the hole. Sufficient adhesive strength cannot be obtained, and the urethane resin that has been filled and hardened tends to come off easily, and if the screw nail position is shifted within the range of the diameter and struck again, the required pull-out strength can be obtained. There was to be no.

Therefore, an object of the present invention is to make it possible to re-strike in a very short time and obtain sufficient pull-out strength even when the sleeper made of a thermosetting resin foam is particularly humid. To do.

[0005]

The present invention takes the following technical means in order to achieve the above object.

[0006] That is, the method of re-driving dog nails or screw nails to the sleeper of the present invention is to make a hole after removing the dog nails or screw nails driven into the sleeper made of fiber-reinforced thermosetting resin foam. , An uncured fast-curing resin composition mixed with short fibers, which does not foam when reacting with water, is filled and cured, and the dog nail or screw nail prepared hole is provided again, and then the dog nail Alternatively, it is characterized by driving a screw nail. According to the present invention, as the fast-curing resin composition to be injected into the trace holes, since the one that does not foam by reacting with water is used, even in the case of re-strike construction in rainy weather or immediately after rainy weather, It is possible to form a solid having a hardness sufficient to obtain mechanical strength without causing the resin agent filled in the holes to foam. Furthermore, by using a quick-curing resin that cures in about 10 minutes, for example, a rail that can be installed within a limited time, such as from a passing train to the next passing train, or from the first train on the next day after passing the last train. In the renewal work and repair work of, the curing is completed in an extremely short time,
Even if the dog nail or screw nail is struck again so that it overlaps with the filling cured part of the trace hole after pulling out the dog nail or screw nail of the sleeper,
The filling-hardened portion can form a solid having mechanical strength that exhibits sufficient pull-out strength for dog nails and screw nails. In particular, when resin is filled in the trace hole after the screw nail is pulled out, a screw groove is formed on the inner peripheral surface of the trace hole, and the resin enters the screw groove and hardens, which causes the anchor effect. It becomes possible to obtain a large pull-out strength.

The re-strike method of the present invention can be suitably used particularly when shifting the positions of dog nails and screw nails within the range of the nail holes and striking them again. In this case, the prepared hole may be provided so as to overlap the resin agent filled and cured in the trace hole.

In the above method of the present invention, after the dog nail or the screw nail is pulled out and before the fast-curing resin composition is filled,
It is preferable that the water in the holes be blown out of the holes by air blow. According to this, even if water is accumulated at the bottom of the trace hole, it is possible to prevent water from being mixed into the resin by blowing it off with an air blow by using an air gun etc. before filling the resin, so that the mechanical strength is sufficient. In addition, since the quick-setting resin is used, the filling resin is hardened before water seeps out from the peripheral surface of the hole.

Further, when the trace hole after the dog nail or the screw nail has been removed is damaged, the trace hole is enlarged and bored larger than the damaged portion to remove the damaged portion, and the trace hole is expanded in diameter. After forming a groove portion extending in the circumferential direction on the inner peripheral surface of the above, the rapid curing resin composition can be filled in the holes. According to this
Since the groove portion extending in the circumferential direction is formed on the inner peripheral surface of the trace hole after removing the damaged portion by using a jig such as a threaded tap or a mold bolt, when the fast-curing resin composition is filled, The resin agent enters into the groove portion and hardens to exert a great anchoring effect, whereby sufficient pull-out strength can be obtained. The groove may be a screw groove or a plurality of annular grooves arranged in the axial direction.

In the case of re-strike of the dog nail, since the groove in the circumferential direction is not formed on the inner peripheral surface of the trace hole after the dog nail is pulled out, if the resin is directly filled and cured, the anchor effect is sufficient. Pullout strength cannot be obtained. Therefore, in this case, on the circumferential surface of the trace hole after the dog nail is pulled out, without expanding or expanding the diameter,
It is preferable that a groove portion extending in the circumferential direction is formed on the inner peripheral surface of the pit by using a jig such as a tap for tapping or a mold bolt, and then the pit is filled with the quick-curing resin composition.

The fast-curing resin composition may be a fast-curing resin composition that does not react with water to foam and harden in a short time of about 10 minutes, but constitutes a sleeper. It is preferable to adopt a resin having excellent adhesiveness to the thermosetting resin. Specifically, as the fast-curing resin composition, an unsaturated polyester resin containing a radical generator such as an organic peroxide catalyst, a curing accelerator, and a short fiber such as glass chop can be used. In addition, it may be mainly composed of a vinyl ester resin.

The unsaturated polyester resin is synthesized by subjecting an unsaturated dibasic acid or a saturated dibasic acid and a dihydric alcohol to a condensation reaction, and has an unsaturated bond and an ester bond in the molecule. Since this resin has a molecular weight of about several thousand and is poor in homopolymerizability, it is usually copolymerized with a vinyl monomer such as styrene to obtain a cured resin. Therefore, the unsaturated polyester is generally distributed as a liquid resin having a relatively low viscosity in which the unsaturated polyester is dissolved in a monomer. At the time of curing, a radical generator such as an organic peroxide is used as a catalyst.

Examples of the unsaturated dibasic acid used in the unsaturated polyester include maleic anhydride and fumaric acid. Examples of the saturated dibasic acid include adipic acid, phthalic anhydride, isophthalic acid and tetrachloro Examples thereof include phthalic anhydride, 3,6-endodichloromethylene / tetrachlorophthalic acid, and 3,6-endomethylene / tetrahydrophthalic anhydride.

Examples of the dihydric alcohol used for the unsaturated polyester include ethylene glycol, propylene glycol, 1,3-butanediol, diethylene glycol, dipropylene glycol, neopintyl glycol and bisphenol A propylene oxide adduct. You can

Examples of the vinyl monomer used for the unsaturated polyester include styrene, ortho-chlorostyrene, diallyl phthalate, triallyl isocyanurate, methylmethacrylic acid and diallylbenzenephosphonate.

The unsaturated polyester resins can be classified into general-purpose resins (ortho-based unsaturated polyester resins), isophthalic acid-based resins, bisphenol A-based resins, etc., according to the composition. Among general-purpose resins, those with an increased amount of maleic anhydride are called highly reactive resins, and these highly reactive resins have high hardness and heat resistant temperature, and
The curing speed and heat generation during curing are also relatively large.

Specific examples of the unsaturated polyester resin include, for example, "Epolak" manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd., "Kaya Resin WMC" manufactured by Nippon Kayaku Co., Ltd., and "Gocerac" manufactured by Nippon Synthetic Chemical Industry Co., Ltd. , "Yukirac" manufactured by Nippon Organic Chemical Industry Co., Ltd., "Hakusan Premix" manufactured by Hakusan Co., Ltd., "Polyset" manufactured by Hitachi Chemical Co., Ltd., "Fudo Premix" manufactured by Fudo Chemical Co., Ltd. , "National Premix" manufactured by Matsushita Electric Works, Ltd.,
Mitsui Toatsu Chemical Co., Ltd. "Ester", Nippon Gohsei Kako Co., Ltd.
Examples thereof include "Esterite" manufactured by Sumitomo Bayer Urethane, and "Roskidal".

As the curing agent for the unsaturated polyester resin, benzoyl peroxide, methyl ethyl ketone peroxide (MEKPO), cyclohexanone peroxide,
Organic peroxide catalysts such as lauroyl peroxide, di-tert-butyl peroxide, tert-butyl perbenzoate, cumene hydroperoxide and dicumyl peroxide can be preferably used.

Further, it is preferable to mix a curing accelerator in order to obtain a fast curing property which cures at room temperature in about 10 minutes. As such a curing accelerator, cobalt naphthenate, dimethylaniline or the like can be used. When MEKPO is used as the catalyst, cobalt naphthenate can be used alone or together with dimethylaniline as the promoter. MEKPO is usually available as a 60% solution of dimethyl phthalate, and cobalt naphthenate is available with a metallic cobalt content of 6%. When both cobalt naphthenate and dimethylaniline are used as accelerators, the amount of cobalt naphthenate is about 2 to 3 times the amount of dimethylaniline (parts by weight).
Is preferred.

The catalyst (curing agent) is preferably used in an amount of 1 to 3 parts by weight, and more preferably 1.8 to 2.2 parts by weight, based on 100 parts by weight of the unsaturated polyester resin. The amount of the curing accelerator varies significantly depending on the composition of the resin, the temperature, etc., and therefore it is preferable to determine the proper amount of the accelerator by conducting a test in advance.

Examples of the above-mentioned short fibers include glass fibers, carbon fibers and aramid fibers, but it is preferable to use glass chops from the viewpoint of mechanical strength, weather resistance and cost.

The fast-curing resin composition may be blended with appropriate additives and fillers, if necessary. Further, it is preferable that at least the curing agent of the fast-curing resin agent is packed separately from the uncured resin, and the curing agent is mixed immediately before the injection into the pit at the site. For example, when the above unsaturated polyester resin is adopted, only the radical initiator can be separately packaged, and the other unsaturated polyester resin, the curing accelerator and the short fibers can be previously compounded and packaged in the factory. As a result, the optimum curing rate can be guaranteed by ensuring the optimum compounding amount of the curing accelerator according to the temperature.

The type of foamed resin in the fiber-reinforced thermosetting resin foam constituting the sleeper is, for example, a thermosetting resin such as urethane resin, epoxy resin, vinyl ester resin, unsaturated polyester resin or phenol resin. A hard material is preferably used. In addition, in order to improve the compression strength and reduce the cost in the foamed resin, inorganic fillers such as calcium carbonate, gypsum, talc, aluminum hydroxide, and clay, and lightweight bone such as shirasu balloon, pearlite, and glass balloon. Material may be added.

The fiber for reinforcing the foam may be, for example, inorganic fiber such as glass fiber, carbon fiber or metal fiber, or organic fiber such as natural fiber or synthetic fiber. Glass fiber is suitable from the viewpoint of the property. Examples of the glass fiber include glass roving, glass roving cloth, glass mat, and continuous strand mat. This fiber may be used alone or may be laminated in two or more layers,
Further, long fibers and short fibers may be mixed and used. In addition,
Glass long fibers are aligned in the longitudinal direction to form reinforcing fibers,
Long glass fiber reinforced rigid urethane foam (for example, Sekisui Chemical Co., Ltd., trade name "Eslon Neo Lumber FF
It is most preferable to adopt "U" or the like) for the purpose of weight reduction, durability and workability.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a tie plate 2 with a screw nail 4 fastened to a synthetic sleeper 3 made of long glass fiber reinforced hard urethane foam in order to adjust the track of the railroad rail 1 and to correct the track. It is sectional drawing which shows a state. Figure 2
FIG. 3 is a process diagram showing an example in which the hole 5 after the screw nail 4 is pulled out is filled with a quick-curing resin composition 6 for repair, a new pilot hole 7 is newly provided, and the screw nail 4 is struck again.

To re-tack the screw nail 4, first, as shown in FIG. 1, the screw nail 4 is pulled out from the sleeper 3 and the tie plate 2 and the rail 1 are removed from the sleeper 3, or
Pull out the sleepers 3 from under the rail to the side. Note that, in many cases (even when it is being constructed in fine weather), the water contained in the sleepers 3 exudes into the trace holes 5 of the sleepers 3 in FIG. 2 (a). As shown in the figure, the water is accumulated.

Next, the fast-curing resin composition 6 is prepared. In this example, a main agent made of an uncured resin composition separately packaged and a curing agent for curing the main agent are carried into the site, and the main agent and the curing agent are injected immediately before injection and filling into the trace holes 5. A rapid-curing resin composition is prepared by mixing. The components of the main agent and the curing agent, and examples of their blending are shown below. In addition, in the formulation example of the main agent, the curing rate changes remarkably depending on the air temperature. ℃
Above 20 ℃, and (D) above 20 ℃ and above 30 ℃
When the amount is less than 4, the compounding amount of the curing accelerator is determined by classifying into four.

[0029] (Main agent)       Ingredients Product name, etc. Mixture (parts by weight)                                                   (A) (B) (C) (D) −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Unsaturated polyester resin Nippon Shokubai "Epolak 515 FX" 100 100 1 00 100 Cobalt naphthenate (promoter) Cobalt concentration 6% Product 0.5 0.5 0.35 0.15 Dimethylaniline (promoter) Samsung Chemical Industry Co., Ltd. 0.25 0.25 0.1 5 0.05 Glass chop (1.5mm) Nittobo CSZHB406S 5 5 5    Five

[0030] (Curing agent)       Ingredients Product name, etc. Mixture (parts by weight) −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− MEKPO Kayaku Akzo "Kayamek A" 2 2 2    2

The mixing of the main agent and the curing agent can be carried out in the cup 7, and is appropriately agitated and mixed by using a stirring rod or the like. In addition, since glass chops have settled on the bottom of the main agent container, after stirring well in the main agent container,
It is preferable to put the base agent in the cup 7.

When the preparation of the quick-curing resin composition 6 is completed, as shown in FIG. 2 (b), the water in the trace hole 5 is immediately blown out by air blow using the air gun 8.
Subsequently, as shown in FIG. 2 (c), the rapid hardening resin composition 6 is immediately injected and filled from the cup 7 into the trace hole 5. This injection is preferably performed until the resin composition 6 overflows from the hole 5. It is preferable to remove the overflowed resin in a semi-cured state (after about 3 minutes) using a scraper or the like.

Depending on the environmental conditions at the time of construction, about 10 minutes after the injection of the resin composition 6, the resin injected into the trace holes 5 is almost cured. When the screw nail 4 is in a state in which the rail 1 can be fastened to the sleeper 3 with sufficient strength through the tie plate 2, as shown in FIG. 2D, the screw nail 4 is displaced within the diameter range of the original screw nail position. Then, the prepared hole 9 for re-tapping the screw nail is punched using the punching tool 10 such as a drill. Then, as shown in FIG. 2E, the screw nail 4 can be struck again at the position of the prepared hole 9.

The pull-out strength test result of the screw nail 4 thus re-stripped was about 55 kN to 65 kN. On the other hand, the pull-out strength of the screw nail when a new screw nail is newly driven into a solid sleeper is about 60 kN to 70 kN, and the pull-out strength of the above-mentioned re-stamped screw nail 4 is comparable to the required performance. It is also sufficiently satisfactory for 30 kN.

FIG. 3 shows an example of construction in which the thread groove on the inner peripheral surface of the hole 5 is damaged when the screw nail 4 is pulled out. In this case, even if the damaged trace hole 5 is directly filled with the resin composition 6 and hardened, the screw groove is damaged, so that a sufficient anchoring effect is not exerted and the pull-out strength is reduced. . So in this case,
As shown in FIG. 3 (b), using a punching tool 11 such as a drill having a diameter larger than that of the damaged thread groove, the trace hole 5 is expanded to a diameter larger than the damaged portion to remove the damaged portion. . Next, FIG.
As shown in (c), a thread groove 13 (a groove portion extending in the circumferential direction) having a predetermined depth is axially formed on the inner peripheral surface of the enlarged trace hole 5 ′ by using a tap 12 for thread cutting or a mold bolt. Form over almost the entire length. When the preparation up to this point is completed, the work of preparing the fast-curing resin composition 6 is performed in the same manner as above, and
After the water is blown off by the air blow as shown in (d), the quick-curing resin composition 6 is rapidly injected and filled into the trace hole 5'as shown in FIG. 3 (e). Then, after leaving it until it hardens, a prepared hole 9 is punched as shown in FIG. 3 (f), and the screw nail 4 is struck again as shown in FIG. 3 (g).

FIG. 4 is a process drawing of an embodiment relating to the method of re-stamping the dog nail 4 '. The dog nail 4'has a substantially rectangular cross section and is not provided with a screw like a screw nail.
There is no groove extending in the circumferential direction on the inner peripheral surface of the mark hole 5 after the dog nail 4'is extracted. Further, normally, the inner surface of the hole 5 is inclined so that the upper side becomes wider as shown in FIG. Therefore, even if the hole 5 is filled with resin and hardened, not only the anchor effect is not exhibited, but also the inclination of the inner surface becomes a draft, and the state easily comes off.

Therefore, in this embodiment, as shown in FIG. 4 (b), a tap for threading having an outer diameter larger than the inscribed circle of the trace hole 5 having a rectangular shape in plan view after the dog nail 4'is extracted. 14 is used to form the thread groove 13 on the inner peripheral surface of the trace hole 5, and then the uncured quick-curing resin composition 6 immediately after preparation is subjected to the air blow step of FIG. I try to fill the inside. As a result, the cured resin composition 6 is engaged with the groove portion 13 to exert a great anchoring effect,
Sufficient pull-out strength can be obtained. After the resin is cured, the prepared hole 9 as shown in FIG.
4 (f), the dog nail 4 can be driven into the prepared hole 9 with a hammer 15 as shown in FIG. 4 (f).

[0038]

According to the present invention, even if rainwater penetrates into the driving part of dog nails or screw nails and water is collected in the hole of the extraction mark, the hole is surely filled with resin and cured. It is possible to improve the efficiency of reworking within a limited time such as at night without causing the resin to foam in this short time.

[Brief description of drawings]

[Fig. 1] Rail fastening screw nails 2 driven into a synthetic sleeper
It is a simplified sectional view of a railroad track cut by a plane including a central axis of a book.

FIG. 2 is a process drawing of a method for re-threading a screw nail according to an embodiment of the present invention.

FIG. 3 is a process diagram of a screw nail re-dosing method according to another embodiment of the present invention.

FIG. 4 is a process drawing of a dog nail re-strike method according to still another embodiment of the present invention.

[Explanation of symbols]

4 screw nails 4'inu nail 5 trace holes 6 Fast-curing resin composition 9 prepared holes 13 screw groove

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshimasa Hama             15-1 Shimotara, Maibara-cho, Sakata-gun, Shiga Prefecture             Passenger Railway Co., Ltd. Shinkansen Railway Business Division Yonehara             Inside the line station (72) Inventor Ryoichi Taniguchi             193-1 Takanose, Toyosato-cho, Inugami-gun, Shiga Sekisui             F / F Yu Kogyo Co., Ltd. (72) Takashi Yamashita, inventor             193-1 Takanose, Toyosato-cho, Inugami-gun, Shiga Sekisui             F / F Yu Kogyo Co., Ltd. F-term (reference) 2D057 BA23 BA30

Claims (5)

[Claims] 1. An uncured quick-curing resin composition in which short fibers are mixed in the hole left after the dog nail or screw nail is driven into a sleeper made of a fiber-reinforced thermosetting resin foam. That is, the one that does not foam when it reacts with water is filled and cured, and then a dog nail or screw nail prepared hole is provided again, and then a dog nail or a dog nail to sleeper characterized by driving in a screw nail or How to re-screw a screw nail. 2. The sleeper according to claim 2, wherein the water in the trace hole is blown out of the hole by air blow after the dog nail or the screw nail is pulled out and before the quick-curing resin composition is filled. How to re-mount dog nails or screw nails. 3. When the trace hole after the dog nail or the screw nail is pulled out is damaged, the trace hole is enlarged and bored larger than the damaged portion to remove the damaged portion, and the trace hole is expanded in diameter. The dog nail or the screw nail is re-fastened to the sleeper according to claim 1 or 2, wherein a groove portion extending in the circumferential direction is formed on the inner peripheral surface of the sheet, and the hole is filled with the quick-curing resin composition. Method. 4. The fast-curing resin composition is an unsaturated polyester resin containing a radical generator, a curing accelerator and the short fibers, wherein the fast-curing resin composition is a unsaturated polyester resin.
A method of re-doming dog nails or screw nails to the sleeper described in. 5. The dog nail or screw nail retouching on the sleeper according to claim 4, wherein the radical generator is methyl ethyl ketone peroxide, and both cobalt naphthenate and dimethylaniline are used as curing accelerators. Method.