JP2000038705A - How to repair sleeper joints - Google Patents

Abstract

(57) [Summary] A method of repairing a sleeper capable of rapidly and sufficiently exhibiting the pull-out strength of a rejoined joining member within a limited working time is provided. An adhesive (6) having a high curing speed is injected into a drawing hole (5) formed by drawing out a joining member (2) for joining a rail (4) and a sleeper (1) made of a fiber-reinforced resin foam.
Before the adhesive 6 is cured, the plug 7 made of a fiber-reinforced resin foam is inserted into the drawing hole 5 and the adhesive 6 is cured, so that the sleeper 1 and the plug 7 are bonded to each other. After being joined together through the outer diameter of the joining member 2,
A pilot hole for introducing the joining member 2 is formed, and the joining member 2 is attached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a joint of a sleeper.

[0002]

2. Description of the Related Art In a track of a JR, a private railway, or the like, a rail and a sleeper are joined by a train, a vehicle load, vibration, or the like when a train or a vehicle passes through a rail gauge, a bridge, a railroad crossing, or the like. When the joining member (screw nail, dog nail, etc.) is loosened or pulled out, after removing the joining member, a hole of a predetermined diameter is drilled, and a cylindrical plug having the same diameter as the drilled hole is used. An adhesive is applied to the plug before embedding in the perforated hole.

According to the above-described method, when the plug is inserted into the drilled hole, the adhesive applied is laid down and an adhesive is interposed between the outer peripheral surface of the plug and the inner wall surface of the drilled hole. However, there has been a problem that a predetermined adhesive strength cannot be obtained. Therefore, a method of embedding a plug having a polygonal cross section, in which the diameter of the circumscribed circle is larger than the diameter of the drilled hole and the diameter of the inscribed circle is smaller than the diameter of the drilled hole, through an adhesive is used. Has been proposed (Japanese Patent Laid-Open No. 2-261101). In the above method, a two-pack type epoxy resin adhesive is usually used as the adhesive.

A method has also been proposed in which a hole from which a joining member is removed is filled and cured in advance with a urethane resin, then a hole having a predetermined diameter is formed, and the joining member is attached (Japanese Patent Laid-Open No. 9-125303). No.).

[0005]

However, Japanese Patent Application Laid-Open No.
According to the method described in Japanese Unexamined Patent Publication No. -261101, a two-part type epoxy resin adhesive generally has a long curing time, and replacement work of a joining member is often performed at night. If it decreases, the curing time is further increased, and the working time is prolonged, or the epoxy resin-based adhesive does not cure within the limited working time. However, there is a problem that it is not expressed.

Further, according to the method disclosed in Japanese Patent Application Laid-Open No. 9-125303, since the filled and hardened urethane is hard, the tip of the drill for drilling is required when the prepared hole is re-drilled several mm from the drawn hole. There is a problem that it is difficult to escape and accurately pierce.

The present invention solves the above-mentioned problems, and provides a method for repairing a joint of a sleeper capable of quickly and sufficiently exhibiting the pull-out strength of a re-joined joint member within a limited working time. The purpose is to provide.

[0008]

According to a first aspect of the present invention, there is provided a method for repairing a joint of a sleeper (hereinafter referred to as "the present invention 1"), comprising joining a rail and a sleeper made of a fiber-reinforced resin foam. Injecting a fast curing adhesive into the extraction hole created by extracting the member, before the adhesive is cured, insert a plug made of fiber reinforced resin foam into the extraction hole,
After curing the adhesive, the sleeper and the plug are integrally joined via the adhesive, and then a pilot hole for joining member introduction, which is smaller than the outer diameter of the joining member, is formed. Is to be attached.

The material of the sleeper used in the present invention 1 is not particularly limited, but is preferably a fiber-reinforced resin foam, more preferably a mixture obtained by mixing a urethane prepolymer and glass fiber and foam-hardening the mixture.

[0010] The joining member used in the present invention 1 includes:
Usually, a joining member used for fixing the sleeper and the rail can be used, and examples thereof include a screw nail, a dog nail, and a screw bolt.

The material of the joining member is not particularly limited, but is preferably a fiber-reinforced resin foam, more preferably a mixture obtained by mixing a urethane prepolymer and glass fiber and foam-curing the mixture. In addition, the sleeper and the joining member,
The same material or different materials may be used.

The adhesive having a high curing speed used in the present invention 1 may be used within a limited time, for example, from the passing train to the next passing train, or from the last train to the next train passing the next day. In the renewal work or repair work of the rails, it is preferable that the hardening be completed in an extremely short time. Specifically, although it depends on the temperature at the time of the work, at least at the assumed temperature (0 to 20 ° C.) It is preferable that the hardening is completed within 10 minutes, and the filled hardened portion of the hole at the mark where the screw nail of the sleeper is pulled out forms a hardened state that sufficiently improves the pull-out strength of the joining member.

The above-mentioned adhesive is not particularly limited as long as it satisfies the above-mentioned properties. One-part curable urethane prepolymer, or two-part curable urethane prepolymer having a main component and a curing agent divided into two components is used. Examples thereof include urethane prepolymers and polyesters. In particular, two-part curable urethane prepolymers are suitably used from the viewpoint of management and other aspects.

The two-part curable urethane prepolymer preferably comprises a polyisocyanate and a polyol.

[0015] The adhesive of the present invention 1 may include an adsorbent for adsorbing water and carbon dioxide, a filler, a thixotropic agent,
Plasticizers, adhesion promoters, stabilizers and the like may be added in a range that does not depart from the gist of the present invention.

According to a second aspect of the present invention, there is provided a method for repairing a joint portion of a sleeper (hereinafter referred to as “the present invention 2”) by pulling out a joining member for joining a rail and a sleeper made of a fiber-reinforced resin foam. After the diameter of the drawn hole is increased, an adhesive with a high curing speed is injected into the expanded hole, and before the adhesive is hardened, an plug made of a fiber-reinforced resin foam is inserted into the drawn hole. After inserting and curing the adhesive, the sleeper and the plug are joined together via the adhesive,
A pilot hole for introducing the joining member, which is smaller than the outer diameter of the joining member, is formed, and the joining member is attached.

According to the second aspect of the present invention, if the outer diameter of the plug to be inserted is too small, the moisture adhered to the inner surface of the pull-out hole remains, and the size of the adhesive is reduced. Inhibiting curing, the adhesive may foam,
On the other hand, if the size is too large, the amount of the adhesive required increases, leading to an increase in cost.

The adhesive used in the present invention 2 is not particularly limited as long as it can bond the inner wall of the enlarged diameter drilling hole and the plug, and the same adhesive as that of the present invention 1 can be used.

(Function) In the method for repairing a joint of a sleeper according to the first aspect of the present invention, an adhesive is applied to a hole formed by extracting a joining member for joining a rail and a sleeper made of a fiber-reinforced resin foam. Inject and insert an embedding made of fiber reinforced resin foam into the drawing hole before the adhesive hardens, and by hardening the adhesive, the sleeper and the embedding are integrated through the adhesive. After joining, a pilot hole for joining member introduction, which is smaller than the outer diameter of the joining member, is drilled and the joining member is attached, so the curing speed of the adhesive is fast, so within a limited working time The holes in the traces from which the adhesive was quickly cured and the sleeper joint members were removed are repaired to such an extent that the rejoined joint members can exhibit sufficient pull-out strength. Repair work can be performed in a very short time.

The method for repairing a joint of a sleeper according to the second aspect of the present invention is a method of repairing a joint between a rail and a sleeper made of a fiber-reinforced resin foam, by expanding a drawing hole formed by extracting a joining member for joining the rail and the sleeper. By injecting an adhesive having a high curing speed into the expanded drawing hole, and before the adhesive is cured, inserting a plug made of a fiber-reinforced resin foam into the drawing hole and curing the adhesive. Since the sleeper and the plug are integrally joined via an adhesive, a pilot hole for joining member introduction smaller than the outer diameter of the joining member is formed, and the joining member is attached. Due to the influence of moisture in the drawing hole, the curing of the adhesive is not inhibited, and the adhesive does not foam.

[0021]

Embodiments of the present invention will be described below in more detail with reference to the drawings.

FIG. 1 shows a screw nail 2 for renewing a railway rail.
FIG. 5 is an explanatory view showing a work of removing the tie plate 3 and the rail 4 from the sleeper 1 by partially cutting out a cross section, in which a screw hole 2 (M22 × 144 mm) is removed from the sleeper 1 to form a drawing hole 5. .

Next, as shown in FIG. 2, an insufficient amount of the urethane prepolymer 6 is filled into the drawing hole 5 to fill the drawing hole 5 (about half of the drawing hole 5 is filled). .

Further, as shown in FIG. 3, before the filling operation of the urethane prepolymer 6 shown in FIG. 2 is completed and before the urethane prepolymer 6 is cured, the plug 7 (formed of a fiber-reinforced urethane resin foam) is formed. (See FIG. 6). At this time, after the urethane prepolymer 61 protruding from the surface of the sleeper 1 is cured, it is sanded (a chisel, a hatchet, or the like).
, So that it is smoothed out.

Then, as shown in FIG. 4, after the screw nail 2 is in a state where the rail 4 can be fastened to the sleeper 1 with sufficient strength via the tie plate 3, the screw nail pilot hole 51 is drilled or the like. It is pierced using a piercing machine 52, and the screw nail 2 is attached.

Since the present invention 2 is the same as the present invention 1 except that the diameter of the drawing hole 5 is expanded in advance, in FIG. Is omitted.

[0027]

EXAMPLES Example 1 A sleeper 1 (material: manufactured by Sekisui Chemical Co., trade name "FFU") was previously 18 mm in diameter and 120 m in depth.
After a hole of m was drilled and a screw nail 2 (M22 × 144 mm) was screwed in, the screw nail 2 was removed and the inside of the hole was cleaned to form a drawing hole 5. On the other hand, the viscosity at 25 ° C. is 1 part by weight with respect to 100 parts by weight of the liquid A having a viscosity of 590 cP at 25 ° C. as a main component.
A two-part urethane prepolymer 6 comprising 100 parts by weight of a liquid B comprising 80 cP polyisocyanate was obtained.

Hereinafter, according to the steps shown in FIGS.
About 1/2 of the tamprepolymer was injected into the drawing hole 5.
Later, FIG. 6A type (L = 110 mm, D₁= 21m
m, D _Two= 18mm, Material: Sekisui Chemical Co., Ltd., trade name "F
FU ”) and plug urethane prepolymer
After being cured, the extraction hole 5 and the plug 7 are integrally joined,
The hole 51 (diameter 19mm, depth 120mm)
Drilled in the same position as the screw hole of the screw, and attach the screw 2
Was.

(Example 2) The screw nail 2 was attached in the same manner as in Example 1 except that the screw hole 51 was provided at a position 2.5 mm away from the center of the original screw hole.

(Example 3) Except that the screw hole 51 is provided at a position 5 mm away from the center of the original screw hole,
The screw nail 2 was attached in the same manner as in Example 1.

(Embodiment 4) A drawing hole was previously formed with a diameter of 25 mm.
The screw nail 2 was attached in the same manner as in Example 1 except that the diameter was increased to 130 mm.

(Comparative Example 1) The screw nail 2 was attached in the same manner as in Example 1 except that the drawing hole was filled with the urethane prepolymer 6 without using the plug 7.

(Comparative Example 2) After grease was applied to the drawing hole, water was injected, and water was wiped off with a paper waste cloth.
The screw nail 2 was attached in the same manner as in Example 1 except that the drawing hole was filled with the urethane prepolymer 6 without using.

(Comparative Example 3) A drawing hole was previously formed with a diameter of 25 mm.
After drilling a diameter of 130 mm and applying grease,
After injecting water and wiping off the water with a paper waste cloth, the screw nail 2 was attached in the same manner as in Example 1 except that the drawing hole was filled with the urethane prepolymer 6 without using the plug 7. .

Evaluation method Pull-out strength The pull-out strength of the sleeper with the screw 2 obtained as described above was measured at a loading speed of 5 mm / min. Repeated fatigue test Screw nail 2 with screw nail 2 obtained as described above
A repetitive load (5 Hz) of 13 ± 12.5 kN was applied between the head and the sleeper 1, and the number of times to break was determined. The above results are summarized in Table 1.

[0036]

[Table 1]

[0037]

According to the present invention, the method of repairing the joint of the sleeper according to the first invention is as follows.
Since it is configured as described above, within a limited working time, the joint member that has been quickly and re-strengthed has sufficient pull-out strength.

Since the method for repairing the joint of the sleeper according to the second aspect of the present invention is configured as described above, it does not hinder the curing of the adhesive or foam the adhesive.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a railway track cut along a plane formed by the center axes of two rail fastening screws nailed into a sleeper.

FIG. 2 is a cross-sectional view showing the same cross section as FIG. 1 in which a screw nail is removed, a tie plate and a rail are removed, and a drawing hole in a trace where the screw nail is removed is filled with a urethane prepolymer. It is a partial expanded sectional view.

FIG. 3 is a partially enlarged cross-sectional view showing the state in which the urethane prepolymer is filled and the plug is embedded in FIG. 2 in the same cross section as FIG.

FIG. 4 is a cross-sectional view showing the state in which a tie plate and a rail are attached to a sleeper in which a new screw hole has been newly drilled and fastened with a screw nail in the same cross section as FIG. 1 in FIG. 3; is there.

FIG. 5 is a cross-sectional view showing a state in which a screw nail is fastened to a hole formed with an enlarged diameter according to the second embodiment of the present invention.

FIG. 6 shows an example of the shape of the plug used in the present inventions 1 and 2, (a) is a top view thereof, and (b) is a front view thereof.

[Explanation of symbols]

 Reference Signs List 1 sleeper 2 screw nail 4 rail 5 pull-out hole 51 screw nail pilot hole 6 adhesive (urethane resin) 7 plug

Claims (2)

[Claims] An adhesive having a high curing speed is injected into a drawing hole formed by extracting a joining member for joining a rail and a sleeper made of a fiber-reinforced resin foam, and before the adhesive is cured. After inserting the plug made of the fiber reinforced resin foam into the drawing hole and curing the adhesive, the sleeper and the plug are integrally joined via the adhesive,
A method for repairing a joint of a sleeper, comprising: drilling a pilot hole for introducing a joining member, which is smaller than the outer diameter of the joining member, and attaching the joining member. 2. A hardening speed is high in a drawn hole formed by drawing a joining member for joining a rail and a sleeper made of a fiber-reinforced resin foam by drawing a joining member. Inject the adhesive, before the adhesive hardens, insert a plug made of fiber reinforced resin foam into the draw hole,
After curing the adhesive, the sleeper and the plug are integrally joined via the adhesive, and then a pilot hole for joining member introduction, which is smaller than the outer diameter of the joining member, is formed. A method for repairing a joint of a sleeper, comprising attaching a tie.