JPH11256504A - Repair material and repair method for slab type track - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair material having the required physical properties for repairing a packing layer between a track slab and a base coarse structure and capable of being cured even during the winter, while requiring low cost and providing excellent productivity, and to provide a repair method providing good working efficiency, enabling construction work to be achieved in a short time, and providing a repair layer which is stable in strength. SOLUTION: This repair material is made using a radical-setting synthetic resin as a base material, mixed with fragments of a polymer elastic material and inorganic aggregate with the addition of a curing agent for the base material. In particular, the synthetic resin serving as the base material is composed chiefly of a polyester acrylate, the fragments of the polymer elastic material are rubber chips obtained from the cutting of used tires, and the inorganic aggregate is quartz sand. A repair method involves shaving off the degraded part of a packing layer 4, and packing the repair material A into this shaved part 22. The repair material A is packed while being vibrated using a vibrator 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention repairs a filling layer provided as a cushioning material between a track slab and a roadbed-side structure in a slab track having a rail directly connected to a concrete track slab. For repair materials and repair methods.

[0002]

2. Description of the Related Art As an alternative to a ballast-type track having a structure in which rails are fastened to sleepers laid on a ballast ballast, as shown in FIG. Tracked concrete track slab 2
A slab track having a structure in which a rail 3 is directly connected to the slab is adopted.

In this slab track, CA mortar (cement asphalt) in which cement, asphalt emulsion and fine aggregate are mixed between the track slab 2 and the roadbed concrete 1 so that the rail 3 can be elastically supported. (Mortar). In addition, between the columnar projection 5 erected on the roadbed concrete 1 and the track slab 2 to support the lateral load acting on the track slab 2, the same filling layer 6 made of CA mortar as described above is provided. ing.

[0004] The filling layers 4.6 by CA mortar are:
Deterioration / fatigue progresses due to external stresses such as the temperature stress of the rail 3 acting on the track slab 2 and the centrifugal force of trains. Repairs are required within a relatively short period of time.

[0005] In repairing such CA mortar filling layers 4 and 6, rapid hardening is performed so that work can be completed within a short time at night when there is no train operation and the required strength can be developed early. Possible repair materials are used. Specifically, in the repair of the lower slab filling layer 4, a two-pack type urethane resin is employed to satisfy requirements such as spring characteristics and compressive strength required for elastic support of the track slab 2, In repairing the protrusion surrounding filling layer 6, a quick-setting CA mortar, a polyester resin mortar, and a urethane resin similar to those described above, which are improved so that they can be rapidly cured, are used.

[0006]

However, since the urethane resin has fluidity when it is not cured, when the slab lower filling layer 4 is repaired, a mold is laterally formed so that the urethane resin does not flow out. A repair method of installing or injecting with a non-woven tube is adopted. However, in the former method using the formwork, the work of installing and removing the formwork is required, and the work is complicated, and the repair takes a long time. In the latter method using a nonwoven fabric tube, the repair material may not reach all corners and voids may be formed, and it is difficult to obtain stable strength. Especially,
In winter, the viscosity of the urethane resin increases, so that it is necessary to sufficiently heat the injection to obtain a solid repair layer without voids, which requires labor and time.

On the other hand, the quick-hardening CA mortar used for repairing the protrusion surrounding filling layer 6 requires a long time to cure in a low temperature state, and thus has a disadvantage that workability in winter is poor. Further, the polyester resin mortar is liable to crack due to heat shrinkage, is hard, has poor flexibility, and is not optimal as a repair material. On the other hand, the urethane resin is expensive and does not have sufficient permeability to cracks, and is not suitable for repairing the protrusion filling layer 6 where cracks are remarkable.

The present invention has been devised in order to solve such problems of the prior art. The first object of the present invention is to provide required physical properties and to quickly cure even in winter. Another object of the present invention is to provide a repair material which is low in cost and excellent in workability. Further, a second object of the present invention is to provide a repairing method which has a good working efficiency, can be constructed in a short time, and can provide a repairing layer having a stable strength.

[0009]

In order to achieve the first object, in the present invention, a repair material used for repairing a filling layer between a track slab and a roadbed-side structure has a radical curability. A synthetic resin having the same as a base material, a small piece of a polymer elastic material and an inorganic aggregate were mixed with the base material, and a curing agent for the base material was added thereto.

According to this, since a synthetic resin which is cured by radical polymerization is used for the base material, by adding a radical polymerization initiator as a curing agent, it cures quickly even in a low temperature state and has a required strength in a short time. Can be expressed. In addition, the small pieces of the polymer elastic material function to increase the elasticity of the repair layer, and the inorganic aggregate functions to increase the compressive strength of the repair layer, and the mixing ratio of the small piece of the polymer elastic material and the inorganic aggregate is adjusted. Accordingly, the compressive strength and the spring constant of the repair layer can be set to required values suitable for the elastic support of the track slab. Further, since the reaction heat generated during the curing of the base resin is absorbed by the small pieces of the polymer elastic material and the inorganic aggregate, the temperature rise is suppressed, so that cracks due to curing shrinkage can be prevented.

In addition, it is preferable that the radical-curable synthetic resin serving as the base material is mainly composed of polyester acrylate. According to this, it is suitable for securing required compressive strength and spring characteristics, and is relatively inexpensive and excellent in durability. More specifically, the polyester acrylate is preferably a solventless vinyl ester resin or a modified MMA resin. Solvent-free vinyl ester resin is not dissolved in a solvent such as styrene, and should be suitable for repairing the lower slab filling layer by giving thixotropic properties (thixotropic) with silica powder or the like as described later. Can be. On the other hand,
The modified MMA resin is obtained by using methyl methacrylate (MMA) as a part of the monomer serving as a cross-linking agent. By adjusting the viscosity to be relatively low, it is possible to obtain a resin having excellent permeability to cracks. It is suitable for repairing a layer surrounding the protrusion between the protrusion and the protrusion.

Further, it is preferable that the small piece of the polymer elastic material is a rubber chip obtained by cutting an old tire. According to this, it is suitable for securing required compressive strength and spring characteristics, and can be obtained at low cost by using wastes, so that significant cost reduction is possible. The other polymer elastic material may be made of a synthetic resin such as a urethane resin or an ethylene-vinyl acetate copolymer resin (EVA resin). In this case, the polymer elastic material has properties that do not easily dissolve in the solvent of the base resin. Things are desirable.

The inorganic aggregate is preferably silica sand. The inorganic aggregate has properties that do not inhibit the radical curing reaction of the base resin, and the particle size is approximately 0.5 mm to
A diameter of 5 mm is desirable. If the diameter is larger than this, the workability during the mixing and stirring operation with the base resin and the filling operation deteriorates.
As the inorganic aggregate satisfying these conditions, silica sand is most suitable from the viewpoint of cost and availability. Examples of other inorganic aggregates include natural mineral products such as bauxite, fired products such as porcelain and ceramics, and blast furnace slag.

In particular, when used for repairing a slab lower filling layer between a track slab and a roadbed concrete, it is preferable that silica powder is added. According to this, thixotropy can be imparted to the base resin, which makes it difficult to lose shape and can be filled by trowel work without providing a formwork. It can be greatly improved. Moreover,
By the thixotropic property of the base resin, an effect of preventing the sedimentation of small pieces of the inorganic aggregate and the elastic polymer can be obtained. In order to impart thixotropic properties to the base resin, a so-called extender-based fine powder may be used. However, silica powder is not preferred because of its low cost, easy availability, and not inhibiting the radical curing reaction of the base resin. Is optimal.

In order to achieve the second object, according to the present invention, in repairing a filling layer between a track slab and a roadbed-side structure, a degraded portion of the filling layer is scraped off and then cured by radical hardening. A synthetic resin having the property of being a base material, and mixing a small piece of a polymer elastic material and an inorganic aggregate as an aggregate with this, and filling a repair material obtained by adding a curing agent for the base material; did. According to this, the repair layer having the required compressive strength and spring characteristics can be quickly formed, and the repair work can be performed efficiently.

In particular, it is preferable to fill the repair material while applying vibration to the repair material using a vibrator. According to this, a solid repair layer without voids can be formed skillfully.

[0017]

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

The repair material for the track slab according to the present invention is, as described above, made of a radical-curable synthetic resin as a base material, mixed with a small piece of a polymer elastic material and an inorganic aggregate, and cured of the base material. It can be prepared by weighing these materials on site and stirring and mixing them with a hand mixer or the like. In the following description, “parts” means “parts by weight” unless otherwise specified.

First, in a repair material used for repairing the slab lower filling layer 4 between the track slab 2 and the roadbed concrete 1 shown in FIG. 1, a solventless vinyl ester resin is used as a base resin. Silica powder is added to this base resin in advance, the viscosity is adjusted to 350 to 650 poise, and the base resin is in the form of a thixotropic jelly. The mechanical properties of the base resin at the time of curing alone include a tensile strength of 80 to 160 kg / cm ² , an elongation of 65 to 125%,
The tear strength shall be 40 kg / cm ² or more, and the Shore D hardness shall be 44 to 82. It should be noted that the silica powder can be added at the time of on-site preparation.

5 mm old tires are used for small pieces of polymer elastic material.
Use rubber chips that have been cut to an approximate particle size. This rubber chip does not require any special chemical treatment. This rubber chip is used in a ratio of 25 to 60 parts, preferably 40 parts, per 100 parts of the synthetic resin. Silica sand is used for the inorganic aggregate. The silica sand is used in a ratio of 140 to 260 parts, preferably 200 parts, per 100 parts of the synthetic resin.

As a curing agent, powdery benzoyl peroxide (B
PO) or the like. The curing agent is added at a ratio of 2 to 6 parts with respect to 100 parts of the synthetic resin, and the curing time can be adjusted by the addition amount.

The repair material for the lower slab filling layer 4 thus formed is hardly deformed in an uncured state, can be efficiently filled by a trowel work, and can be cured in about one hour in winter. It is. On the other hand, at the time of curing
A spring constant of f / cm ± 20% can be obtained.

On the other hand, a modified MMA resin is used as a base resin of a repair material in the filling layer 6 around the protrusion between the track slab 2 and the protrusion 5. This base resin is adjusted to have a viscosity of 200 to 700 centipoise and has good permeability to cracks. In addition, the mechanical properties at the time of curing of a simple substance are as follows.
5 to 65 kg / cm ² , elongation percentage is 130 to 250%, tear strength is 10 kg / cm ² or more, and Shore D hardness is 36 to 68.

The same rubber chips, silica sand and hardener as those used in the lower slab filling layer 4 are used. As for the compounding ratio, the rubber chip is 25 to 60 parts, preferably 4 parts, per 100 parts of the synthetic resin in the same manner as described above.
Silica sand is a synthetic resin 10
It is used in a proportion of 60 to 200 parts, preferably 120 parts, with respect to 0 parts.

The material for repairing the protrusion surrounding filling layer 6 can be cured in about 30 minutes even in winter, and a spring constant of 10 tonf / cm ± 20% can be obtained at the time of curing.

Next, a procedure for repairing the lower slab filling layer 4 will be described with reference to FIG. First, as shown in FIG. 2 (A), the deteriorated portion of the filling layer 4 is scraped over a thickness of about 50 to 100 mm. At this time, it is preferable that after the rough cutting is performed by the rotary cutter 21, the deteriorated portion is carefully removed by using a skin. When the work of removing the deteriorated part is completed,
Clean carefully so that no shavings remain on the shaved surface.
If the shaving portion 22 is wet, it is dried using a gas burner or the like as appropriate. Then, a tape is stuck on the surface so as to prevent dirt from adhering to the shaved portion 22, and curing is performed. The gap between the adjacent track slabs 2 is filled with a backup material and cured.

Next, after applying the primer to the shaved portion 22, the work of filling the repair material is started. The same synthetic resin as the repair material is used for the primer, and a predetermined ratio of a hardening agent is added to the primer, and the primer is applied using a brush or a roller.

In the work of filling the repair material, first, an appropriate amount of the repair material prepared in the above-described manner is used in a shaving portion 2 using a trowel.
Distribute to 2. Then, as shown in FIG. 2 (B), the material A is pressed into the repair material A while applying vibration with the vibrator 24 via the wood 23. Thus, the repair material A is densely and deeply filled. Then, after removing the addressing tree 23, a repair material is added as appropriate, and as shown in FIG.
Finishing is performed using a metal iron so that the surface becomes smooth.

The repair of the filling layer 6 around the protrusions shown in FIG.
The work proceeds in substantially the same procedure as in the case of the slab lower filling layer 4 described above. Use a tip or the like to remove the deteriorated part,
If water has soaked into the deteriorated part and is frozen, thaw and dry with a gas burner or the like before proceeding. If ironing work is difficult in the gap between the adjacent track slabs 2, it is preferable to pack a backup material so that the repair material does not spread. When the filling operation is completed,
The curing time can be shortened by covering the upper surface side with a container having a built-in heating element such as a light bulb and keeping the temperature.

[0030]

As described above, according to the repair material according to the present invention, since the synthetic resin which is cured by radical polymerization is used for the base material, it can be quickly cured even in winter and can exhibit the required strength in a short time. In addition, the combination of the small piece of the polymer elastic material and the inorganic aggregate can ensure the compressive strength and the spring characteristics required for the elastic support of the track slab. In addition, the small pieces of the polymer elastic material and the inorganic aggregate suppress the temperature rise during the radical curing reaction, and have an effect of preventing the occurrence of cracks due to curing shrinkage.

In particular, when the radical-curable synthetic resin is mainly composed of a polyester acrylate such as the solvent-free vinyl ester resin, required compressive strength and spring characteristics can be secured. This is effective in reducing costs and increasing durability. Further, by using a rubber chip obtained by cutting an old tire into small pieces of a polymer elastic material and using silica sand as an inorganic aggregate, it is possible to further reduce costs. In addition, by blending silica powder, it is difficult to lose shape and can be filled by trowel work, so that workability in repairing the slab lower filling layer can be greatly improved.

Further, according to the repairing method of the present invention, a repairing layer having required compressive strength and spring characteristics can be quickly formed, and efficient repairing work can be performed.
It has a remarkable effect in shortening the period of repair work and reducing construction costs. In particular, if the repair material is filled with vibration using a vibrator,
A large effect can be obtained in efficiently forming a repair layer having a solid and stable strength without voids.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a slab track.

FIG. 2 is a cross-sectional view showing steps A to C of repairing a slab underfill between a track slab and roadbed concrete in accordance with the repairing method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roadbed concrete 2 Track slab 3 Rail 4 Slab lower filling 5 Projection 6 Protrusion surrounding filling 21 Rotary cutter 22 Shaving part 23 Dead wood 24 Vibrator A Repair material

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masahiro Koyamauchi 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Nagato Ito 2-2-2 Yoyogi, Shibuya-ku, Tokyo No. 2 Inside Tohoku Japan Railway Company (72) Inventor Takeo Takeo 2-2-2 Yoyogi, Shibuya-ku, Tokyo Inside Tohoku Japan Railway Company (72) Inventor Hatsuo Sato 2 Yoyogi, Shibuya-ku, Tokyo (2-2) Inventor, Hiroto Kurahashi 3-11-8, Kanda Nishikicho, Chiyoda-ku, Tokyo Musashino Building Allen Co., Ltd. (72) Inventor, Fumio Yamamoto Koto-ku, Tokyo 4-12-12 Shinkiba Shinto Paint Co., Ltd. (72) Inventor Yoshitaka Murata 4-12-12 Shinkiba Koto-ku, Tokyo Shinto Paint Co., Ltd.

Claims (7)

[Claims] 1. A repair material for a slab-type track used for repairing a filling layer between a track slab and a roadbed side structure, comprising a radical-curable synthetic resin as a base material, A repair material obtained by mixing a small piece of material with an inorganic aggregate and adding a curing agent for the base material. 2. The repair material according to claim 1, wherein the synthetic resin serving as the base material is mainly composed of polyester acrylate. 3. The repair material according to claim 1, wherein the small piece of the polymer elastic material is a rubber chip obtained by cutting an old tire. 4. The repair material according to claim 1, wherein the inorganic aggregate is silica sand. 5. The method according to claim 1, which is used for repairing a lower layer filling between the track slab and the roadbed concrete, wherein silica powder is added. Repair material as described. 6. A slab-type track repairing method for repairing a filling layer between a track slab and a roadbed side structure, comprising: removing a deteriorated portion of the filling layer; A repair method characterized by comprising a base material, a small piece of a polymer elastic material and an inorganic aggregate, and a repair material obtained by adding a curing agent for the base material to the base material. 7. The repair method according to claim 6, wherein the repair material is filled while applying vibration to the material using a vibrator.