JP2023010571A - Ballast track repair method, repair material thereof, and ballast track - Google Patents

Abstract

To provide a ballast track repair method capable of preventing reduction in strength of road-based ballast by simple work, a repair material thereof, and road-based ballast.SOLUTION: The repair method is a method for repairing, by using a repair material M, a ballast track 2 holding a sleeper 4 by road-based ballast 6, and comprises a mixing step of mixing the existing road-based ballast 6 below the sleeper 4 with the repair material M containing rapid hardening cement and a polymer coagulant but not water. The mixing step includes a step of mixing the repair material M containing an acrylamide-based polymer coagulant with the existing road-based ballast 6. The repair method comprises a boring step of boring a repair material input hole 5a in the ballast track 2 toward below the sleeper 4, and a repair material input step of inputting the repair material M into the repair material input hole 5a. The mixing step includes a step of pushing the existing road-based ballast 6 and the repair material M into below the sleeper 4 by using a beater T and mixing the existing road-based ballast 6 with the repair material M.SELECTED DRAWING: Figure 6

Description

This invention provides a ballasted track repairing method for holding sleepers with ballast, a ballasted track repairing material for repairing ballasted tracks by mixing with the existing ballast under the sleepers, and a ballasted ballast for holding the sleepers. Regarding ballasted tracks.

For ballasted tracks mixed with earth and sand, subsidence suppression countermeasures that can be constructed between trains and have a sustained repair effect are required in order to reduce maintenance costs. Conventionally, tamping repairs using a tie tamper have been performed, but if the rate of contamination with earth and sand is high, subsidence will progress and maintenance frequency will increase.

A conventional track repair method (hereinafter referred to as prior art 1) comprises a step of forming a repair material inlet for charging a repair material beside a sleeper laid on ballast, and charging the repair material into the repair material inlet. and a step of ramming the ballast and repair material under the sleeper with a tie tamper to form a solidified body containing the ballast under the sleeper (see, for example, Patent Document 1). In prior art 1, a biodegradable polymer aqueous solution and a reactive agent for gelling the biodegradable polymer aqueous solution are used as repair materials. In prior art 1, when repairing a tie tamper, the repair material is sprayed on the track bed, and the gelled polymer forms a solidified body containing ballast, thereby increasing the sleeper support strength of the track bed and sustaining the repair effect. there is

The conventional ballast track repair method (hereinafter referred to as prior art 2) includes a step of impregnating a liquid filler under the sleeper, a step of integrally hardening the ballast and fine-grained soil with this liquid filler, and a step of and a step of crushing and granulating the fine-grained soil portion of (see, for example, Patent Document 2). In this conventional technique 2, cement (grout) made of ultrafine particles as a liquid filler is impregnated into the ballast that has become finer due to aging deterioration, and the fine-grained soil after solidification is crushed with a hammer drill to crush the fine-grained soil. is granulated. In prior art 2, the granulated mass is pushed under the sleeper together with the ballast by a tie tamper to improve the drainage performance of the ballast track.

Japanese Patent Application Laid-Open No. 2015-068090

Japanese Patent Application Laid-Open No. 2019-002185

In prior art 1, a resin-based material is mixed with ballast using a tie tamper and stabilized, but because it is used in the form of an aqueous solution, the water content of the soil increases before hardening, the strength decreases, and the ballast sinks. could not be suppressed. In the prior art 2, there was a problem in workability because it took a lot of time to spread the grout and cure it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a ballasted track repairing method, a repairing material for the ballasted track, and a ballasted track, which can prevent the strength of the ballast from being lowered by a simple operation.

The present invention solves the above-described problems by means of solutions as described below.
In addition, although the code|symbol corresponding to embodiment of this invention is attached|subjected and demonstrated, it does not limit to this embodiment.
In the invention of claim 1, as shown in FIGS. A method for repairing a ballasted track, comprising a mixing step of mixing the existing track bed ballast under the sleeper with the repair material containing ultra-rapid hardening cement and a polymer flocculant but not containing water (#130; #150) is a ballast track repair method (#100).

According to a second aspect of the invention, in the method for repairing ballasted tracks according to the first aspect, the mixing step includes mixing a repair material containing an acrylamide-based polymer flocculant with the existing track bed ballast. A ballast track repair method characterized by:

The invention of claim 3 is directed to the ballast track repair method of claim 1 or claim 2, as shown in FIGS. 5a), and a repair material charging step (#120) of charging the repair material into the hole. A method of repairing a ballasted track, comprising a step of inserting a material under the sleeper with a tie tamper (T) and mixing the existing track bed ballast with the repair material.

The invention of claim 4 is the ballasted track repair method according to claim 1 or claim 2, as shown in FIGS. 140), wherein the mixing step (#150) pushes the existing track ballast and the repair material under the sleeper with a tie tamper (T) to combine the existing track ballast and the repair material. A method of repairing a ballasted track, comprising the step of mixing.

According to a fifth aspect of the invention, in the ballasted track repair method according to the first or second aspect, as shown in FIGS. 11 and 12, a repair material spraying step (# 140), wherein the mixing step (#150) includes inserting the existing track bed ballast and the repair material under the sleeper by a heavy maintenance machine (E) to A method of repairing a ballasted track, comprising the step of mixing with.

The invention of claim 6 is a ballasted track (2) repairing material for repairing ballasted tracks by mixing with the existing ballast (6) under the sleepers (4), comprising ultra-rapid hardening cement and polymer A ballast track repair material (M) containing a flocculating agent and containing no water.

According to a seventh aspect of the present invention, there is provided a ballasted track repairing material according to the sixth aspect, wherein the ballasted track repairing material contains an acrylamide-based polymer flocculant.

The invention of claim 8, as shown in FIGS. 2, 3, 6, 10 and 12, is a ballast track for holding a sleeper (4) by ballast ballast (6), wherein: is provided with a repair ballast layer (7) in which the existing ballast of the track bed is repaired, and the repair ballast layer contains the existing track ballast under the sleeper, ultra-rapid hardening cement and a polymer flocculant, and contains water. A ballasted track (2) characterized in that it is mixed with a repair material (M) that does not

According to a ninth aspect of the invention, in the ballast track according to the eighth aspect, the repair ballast layer is a mixture of a repair material containing an acrylamide polymer flocculant and the existing track bed ballast. is a ballasted track.

According to this invention, it is possible to prevent a decrease in the strength of the ballast by a simple operation.

1 is a plan view schematically showing a ballast track according to a first embodiment of the invention; FIG. FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1; FIG. 2 is a cross-sectional view taken along line III-III of FIG. 1; FIG. 2 is a process diagram of a ballast track repair method according to the first embodiment of the present invention; FIG. 2 is a schematic diagram for explaining work steps of the ballast track repair method according to the first embodiment of the present invention; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram for explaining a ballast track repair method according to a first embodiment of the present invention, where (A) is a schematic diagram showing a drilling process, and (B) is a schematic diagram showing a repair material charging process and (C) is a schematic diagram showing a mixing step. 1 is a photograph for explaining a ballast track repair method according to a first embodiment of the present invention, (A) is a photograph showing a drilling process, (B) is a photograph showing a repair material injection process, ( C) is a photograph showing the mixing process. It is process drawing of the repair method of the ballast track based on 2nd Embodiment of this invention. FIG. 7 is a schematic diagram for explaining work steps of a ballast track repair method according to a second embodiment of the present invention; FIG. 4 is a schematic diagram for explaining a ballasted track repair method according to a second embodiment of the present invention, where (A) is a schematic diagram showing a state before repair, and (B) is a schematic diagram showing a repair material spraying process. It is a figure and (C) is a schematic diagram which shows a mixing process. It is process drawing of the repair method of the ballast track based on 3rd Embodiment of this invention. FIG. 8 is a schematic diagram for explaining a ballasted track repair method according to a third embodiment of the present invention, where (A) is a schematic diagram showing a state before repair, and (B) is a schematic diagram showing a repair material spraying process. It is a figure and (C) is a schematic diagram which shows a mixing process. It is a graph which shows the relationship between the number of times of loading, and the subsidence amount of a track|orbit.

(First embodiment)
A first embodiment of the present invention will be described in detail below with reference to the drawings.
A roadbed 1 shown in FIGS. 1 to 3 is a base for supporting the ballasted track 2, and is a structure that supports the load when a train passes over the ballasted track 2. As shown in FIG. The roadbed 1 is composed of, for example, a crushed stone roadbed (soil roadbed) sufficiently compacted using high-quality natural soil that is resistant to mud-pumping and frost heaving or a crusher run, an upper roadbed made of an asphalt mixture, and a lower roadbed made of crushed stone. Examples include asphalt roadbed (reinforced roadbed), concrete roadbed made of reinforced concrete slabs and crushed stone with grain size adjustment, and the like.

The ballasted track 2 holds the sleepers 4 with ballast 6 on the ballast bed. The ballasted track 2 includes rails 3, sleepers 4, track beds 5, etc., and constitutes a passage (track) along which the train travels. The ballasted track 2 shown in FIGS. 1 to 3 is a general track structure laid on railway tracks, and is mainly composed of rails 3 , sleepers 4 and track bed ballast 6 . As shown in FIGS. 2 and 3, the ballasted track 2 is formed by an ultra-low-strength stabilization treatment method, in which ballast 6 with high fine grain content is mixed with ultra-fast-hardening cement and a polymer flocculant for stabilization. is repaired to form a repaired ballast layer 7 .

The rail 3 is a member that supports and guides the wheels of the train to run the train. As shown in FIGS. 1 to 3, the rail 3 has a rail head that contacts the wheels of the train, a rail bottom (flange) attached to the sleepers 4, and a rail abdomen that connects the rail head and the rail bottom. (web section), etc. The rail 3 is fastened to the sleeper 4 by a rail fastening device, and is fastened to the sleeper 4 by pressing the top surface of the bottom portion of the rail 3 with a fastening spring.

The sleepers 4 are support bodies (bearing bodies) that support the rails 3 . The sleepers 4 are installed between the rails 3 and the track bed 5 in order to accurately maintain the interval (gauge) between the left and right rails 3 and distribute the train load transmitted from the rails 3 to the track bed 5. there is The sleeper 4 is a track-constituting member that constitutes a part of the ballast track 2 . The sleepers 4 shown in FIGS. 1 to 3 are horizontal sleepers laid side by side at right angles to the rail 3 (normal sleepers used in general sections). The sleeper 4 is, for example, a prestressed concrete sleeper (PC sleeper) prestressed by a steel material (Prestressing Steel (PC)) used as a tendon.

The ballast 5 is a structure that supports the sleeper 4 with a ballast layer. The trackbed 5 is a ballasted trackbed composed of ballast layers in which trackbed ballast 6 is laminated, and distributes and transmits the load to the roadbed 1 . The thickness of the track bed 5, which is the distance from the lower surface of the sleeper 4 to the road bed surface, is 150 to 250 mm or more depending on the track grade in the case of conventional lines. ) is 300 mm or more.

The track bed ballast 6 is granular material such as crushed stone that is spread between the sleeper 7 and the roadbed 1 . The trackbed ballast 6 is, for example, a stone obtained by crushing hard rock such as granite, silica, basalt or andesite to a size of about 15 to 70 mm with a stone crusher. The track bed ballast 6 has a specific gravity of 2.5-3.0 g/cm ³ and a grain size of 19.1-63.5 mm.

The repaired ballast layer 7 is a ballast layer in which the existing ballast 6 under the sleeper 4 is repaired. The repair ballast layer 7 is a mixture of the existing track bed ballast 6 under the sleeper 4 and the repair material M containing ultra-rapid hardening cement and polymer flocculant but not containing water. The repair ballast layer 7 reduces the water content in the track bed 5 by absorbing the water content in the track bed 5, stabilizes the track bed, and suppresses track settlement.

The repair material M is a modifier that repairs the ballasted track 2 by mixing it with the existing track bed ballast 6 under the sleeper 4 . The repair material M contains an ultra-quick-hardening cement and a polymer flocculant, and does not contain water. The repair material M is in the form of powder which is easy to handle so as to react with water in the track bed 5 . The repair material M is mixed with the existing trackbed ballast 6 under the sleepers 4 to prevent the strength of the trackbed ballast 6 from decreasing and suppress the track subsidence. The repair material M contains, for example, ultra-rapid hardening cement and polymer flocculant in the same amount.

Ultra fast-hardening cement is cement that reaches high strength in an extremely short time (rapid hardening cement). It is made by mixing bauxite and fluorite with the raw material of Portland cement. / ^mm2 . If the amount of ultra-rapid hardening cement is less than 0.1%, the effect of reducing the water content in the track bed 5 becomes insufficient, and if the amount exceeds 4.0%, re-repairing becomes difficult. For this reason, it is preferable that the ultra-rapid hardening cement is added in a minimum amount of 0.1% or more to suppress subsidence, and a maximum amount of 4.0% or less to enable tamping and repair. Here, the amount of ultra-rapid hardening cement to be added indicates the ratio of the ultra-rapid-hardening cement to be added when the mass of the dry ballast 6 is taken as 100%. The amount of ultra-rapid hardening cement added is expressed by C/S×100 (%), where C is the mass of ultra-rapid hardening cement and S is the dry mass of the track ballast 6 . The dry mass S of the track ballast 6 is the dry mass of the track ballast 6 corresponding to the volume of the repair material injection hole 5a shown in FIGS. 1 and 6A.

A polymer flocculant is a polymer (flocculation aid) that causes substances dispersed in water to flocculate with a high molecular compound. The polymer flocculant is, for example, an acrylamide-based polymer flocculant such as polyacrylamide. If the added amount of the polymer flocculant is less than 0.1%, there is a problem that the effect of reducing the moisture in the track bed 5 is insufficient, and if the added amount exceeds 4.0%, there is a problem that unreacted polymer flocculant remains. There is For this reason, the polymer flocculant is preferably added in a minimum amount of 0.1% or more that can suppress subsidence, and a maximum amount of 4.0% or less that can be tamped and repaired. Here, the addition amount of the polymer flocculant indicates the addition ratio of the polymer flocculant when the mass of the dry ballast 6 is taken as 100%. The added amount of the polymer flocculant is expressed by P/S×100 (%), where P is the mass of the polymer flocculant and S is the dry mass of the track ballast 6 .

Next, the operation of the ballasted track repair material according to the first embodiment of the present invention will be described.
In the ballasted track 2, when the ballast track 5, which is an elastic-plastic material, is repeatedly deformed due to repeated loads during passage of trains, track settlement occurs due to novel plastic settlement of the rail surface. As a result, the unevenness of the running surface in the vertical direction increases, impeding the original function of the track to provide a smooth wheel running surface. In addition, earth and sand are mixed into the ballast track 2 due to abrasion and floating of the track bed ballast 6 due to long-term use of the ballast track 2, heavy rainfall, and the like. When the amount of fine soil such as clay in the trackbed 5 and the amount of water contained inside the fine soil are large, the trackbed ballast 6 tends to sink due to the train load.

(Action of polymer flocculant)
When the existing track ballast 6 under the sleepers 4 shown in FIGS. 2 and 3 is mixed with the polymer flocculant of the repair material M, the water in the existing track bed ballast 6 is absorbed by the polymer flocculant, and the ballast track is formed. The water content in 2 is reduced by the polymer flocculant. At the same time, the polymer flocculant is entangled like glue in the fine particles of the ballast 6 generated by the wear of the existing ballast 6, and the polymer flocculant converts the fine particles into larger particles (granulation). has the effect of making As a result, the water content in the trackbed 5 is reduced, thereby suppressing track settlement.

(Action of ultra fast hardening cement)
When the existing track ballast 6 under the sleepers 4 and the ultra-rapid hardening cement of the repair material M are mixed, the ultra-rapid hardening cement absorbs the water in the existing ballast 6, and the water in the existing ballast 6 and the ultra-rapid hardening cement are mixed. It reacts with the cement to harden the ultra fast hardening cement. As a result, track subsidence is suppressed by increasing the strength of the track bed ballast 6 .

(Action of polymer flocculant and ultra-fast-hardening cement)
When the fine particles of the existing track bed ballast 6 are granulated by the polymer flocculant, the ultra-rapid hardening cement in the granulated material hardens. As a result, even if water reenters the ballasted track 2, the ballasted track 2 does not absorb water and turn into mud, thereby suppressing track settlement over a long period of time. The fine soil such as clay in the existing track ballast 6 also absorbs moisture with the polymer flocculant, and the fine soil flocculates with the polymer flocculant. Clay hardened to a certain size is further absorbed by the ultra-rapid-hardening cement, and the water in the clay reacts with the ultra-rapid-hardening cement to harden the ultra-rapid-hardening cement. As a result, the clay in the ballast 5 also absorbs water, so that the track subsidence is further suppressed.

Next, a method for repairing ballasted tracks according to the first embodiment of the present invention will be described.
Repair method #100 shown in FIG. Repair method #100 is a track repair method (ultra-low-strength stabilization processing method) in which subsidence of ballast track 2 is suppressed by repair material M. FIG. The repair method #100 includes a drilling process #110, a repair material input process #120, a mixing process #130, and the like.

The drilling step #110 is a step of drilling a repair material injection hole 5a in the ballast track 2 toward the bottom of the sleeper 4. As shown in FIG. In the drilling step #110, as shown in FIGS. 6(A) and 7(A), a tie tamper T is used to drill a repair material injection hole 5a with a predetermined depth down to the bottom of the sleeper 4. As shown in FIG. Here, the repair material injection hole 5 a is a hole for throwing in the repair material M, and is formed obliquely from the surface of the track bed 5 to below the sleeper 4 . The tie tamper T is a track maintenance machine that tampers the track bed ballast 6 in order to correct the subsidence of the ballasted track 2 . The tie tamper T is an engine-equipped tie tamper operated by a track maintenance worker. The electric tip of the tie tamper T is inserted into the track bed ballast 6 under the sleeper 4, and is tilted forward, backward, left and right, and vibrates the track bed ballast under the sleeper 4. Insert 6. In the drilling step #110, for example, as indicated by the two-dot chain line in FIG.

The repairing material charging step #120 is a step of charging the repairing material M into the repairing material charging hole 5a. In the repair material injection step #120, the track maintenance worker throws the repair material M into the repair material injection hole 5a. In the repair material injection step #120, for example, the repair material M is injected into eight repair material injection holes 5a indicated by two-dot chain lines in FIG. 1 as shown in FIGS. 6(B) and 7(B). .

Mixing step #130 is a step of mixing the existing track bed ballast 6 under the sleeper 4 and the repair material M. As shown in FIG. In the mixing step #130, as shown in FIGS. 6(C) and 7(C), the existing track bed ballast 6 and the repair material M are pushed under the sleepers 4 by the tie tamper T, and the existing track bed ballast 6 is and the repair material M are mixed. In the mixing step #130, the existing trackbed ballast 6 is backfilled into the repairing material injection hole 5a into which the repairing material M has been introduced, and the conventional tie tamper T is used to tamp down the trackbed 5. As shown in FIG. In the mixing step #130, the existing track bed ballast 6 and the repair material M are mixed by the tie tamper T and inserted under the sleeper 4 by the tie tamper T.

The ballasted track repairing method, the repairing material, and the ballasted track according to the first embodiment of the present invention have the following effects.
(1) In the first embodiment, the existing track bed ballast 6 under the sleeper 4 is mixed with the repair material M containing ultra-rapid hardening cement and polymer flocculant but not containing water. Therefore, by mixing the existing ballast 6 under the sleeper 4 with ultra-rapid hardening cement and a polymer flocculant, it is possible to stabilize the track and suppress the track subsidence. As a result, it is possible to prevent the strength of the ballast 6 from being lowered by a simple operation. Moreover, since water is not used, initial settling can be prevented, and a decrease in strength of the track bed ballast 6 can be prevented. Furthermore, it is possible to quickly restore the ballasted track 2 that has been contaminated with earth and sand due to a large-scale disaster or the like.

(2) In the first embodiment, the repair material M containing an acrylamide-based polymer flocculant and the existing trackbed ballast 6 are mixed. For this reason, water contained in fine soil or the like in the track bed 5 is adsorbed by the polymer coagulant, and the amount of water in the track bed 5 can be reduced. As a result, the strength of the existing track bed ballast 6 is ensured, and moisture, which causes track subsidence, can be removed and track subsidence can be suppressed.

(3) In this first embodiment, repair material injection holes 5a are formed in the ballast track 2 toward the bottom of the sleepers 4, and the repair material M is injected into the repair material injection holes 5a, and the existing ballast 6 and the existing ballast bed are repaired. The existing track bed ballast 6 and the repair material M are mixed by pushing the material M under the sleeper 4 by a tie tamper T. Therefore, using the tie tamper T, the track bed ballast 6 mixed with earth and sand can be mixed with the repair material M to be stabilized, thereby suppressing the track subsidence. In addition, by spraying the repair material M into the repair material injection hole 5a and then tamping it with a tie tamper T as in normal repair work, subsidence control work that maintains the repair effect can be easily realized. Furthermore, it can be easily constructed with roughly the same amount of work as the conventional repair by tamping.

(Second embodiment)
1 to 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.
The repair method #100 shown in FIG. 8 includes a repair material spreading step ##140, a mixing step #150, and the like. Unlike the repair method #100 shown in FIG. 4, the repair method #100 shown in FIG. 8 omits the drilling step #110. In the repair method #100 shown in FIG. 8, for example, when there is a void in the ballast 6 of the surface layer of the track bed 5, a repair material injection hole 5a as shown in FIGS. 1, 5 and 6A is made. Instead, as shown in FIGS. 9 and 10, after spraying the repair material M on the ballast 6 of the surface layer of the ballast bed, the tamping repair is performed.

Repair material spraying step #140 shown in FIG. In the repair material spraying step #140, as shown in FIGS. 9 and 10, when the track maintenance worker sprays the repair material M onto the track bed ballast 6 on the surface of the track bed 5, the repair material M enters, the repair material M drops downward in the track bed 5, and the repair material M enters the track bed 5. - 特許庁

Mixing step #150 is a step of mixing the existing track bed ballast 6 under the sleeper 4 and the repair material M. As shown in FIG. In the mixing step #150, as shown in FIG. 10(C), the existing track ballast 6 and the repair material M are pushed under the sleeper 4 by the tie tamper T, and the existing track ballast 6 and the repair material M are pushed together. Mix. In the mixing step #150, as shown in FIGS. 9 and 10(C), the existing track bed ballast 6 after the repair material M has been sprayed is put under the sleepers 4 by a conventional tie tamper T, and the track bed 5 Perform tacking work. In the mixing step #150, the existing track bed ballast 6 and the repair material M are mixed by the tie tamper T and inserted under the sleeper 4 by the tie tamper T.

The ballasted track repair method according to the second embodiment of the present invention has the following effects in addition to the effects of the first embodiment.
In this second embodiment, the repair material M is sprinkled on the ballast track 4, and the existing track bed ballast 6 and the repair material M are pushed under the sleepers 4 by the tie tamper T, and the existing track bed ballast 6 and the repair material M and mix. Therefore, the hole drilling step #110 for drilling the repair material injection hole 5a in the ballast track 2 toward the bottom of the sleeper 4 as in the first embodiment is not required, and subsidence suppression countermeasure work can be implemented in a short time. Work load can be reduced.

(Third Embodiment)
In mixing step #150, as shown in FIG. and mix. Here, the maintenance heavy machine E is a track maintenance machine such as a multiple tie tamper that continuously and automatically compacts the ballast 6 while running along the rail 3 . The multiple tie tamper is equipped with a total of eight typing tools per sleeper (only four on one side are shown in FIG. 11) on the inner and outer sides of the left and right rails 3 so as to sandwich the sleeper 4 . In the mixing step #150, as shown in FIGS. 11 and 12(C), the existing trackbed ballast 6 after the repair material M has been sprayed is put under the sleepers 4 by the maintenance heavy equipment E, and the trackbed 5 is Perform tacking work. In the mixing step #150, the existing trackbed ballast 6 and the repair material M are mixed by the heavy maintenance machine E and inserted under the sleeper 4 by the heavy machine E for maintenance. In the mixing step #150, for example, a vibrating typing tool of a multiple tie tamper is inserted into the track bed ballast 6 so as to sandwich the sleeper 4, and the repair material M and the track bed ballast 6 are pushed under the sleeper 4, and the multiple It moves while holding the rail 3 by the clamp of the tie tamper.

The ballasted track repair method according to the third embodiment of the present invention has the following effects in addition to the effects of the first embodiment.
In this third embodiment, the repair material M is sprayed on the ballast track 4, and the existing track ballast 6 and the repair material M are pushed under the sleepers 4 by a heavy maintenance machine E to repair the existing track ballast 6 and the repair material M. Material M is mixed. For this reason, for example, the existing track bed ballast 6 after spraying the repair material M can be pushed under the sleeper 4 by a compacting tool of the heavy maintenance equipment E such as a multiple tie tamper, and then compacted and repaired. can. As a result, it is possible to reduce the burden on the track maintenance worker when implementing subsidence control work.

Next, an embodiment of the invention will be described.
In order to confirm the repair effect of the ballast ballast 6 repair method (ultra-low strength stabilization method) shown in FIGS. The actual track was laid on the roadbed with the left and right rails fastened to one sleeper by a rail fastening device.

As shown in FIG. 7(A), a tie tamper with an engine was used to punch eight holes per sleeper in the ballast where the sleeper and the rail intersect. Next, as shown in FIG. 7(B), a repairing material of ultra-rapid-hardening cement and a polymer flocculant was put into the hole made in the ballast. As the ultra-rapid hardening cement, repair/reinforcing cement manufactured by Denka Co., Ltd. (trade name: Denka Super Cement) was used. As the polymer solidification material, an excavated earth and sand improvement solidification agent (polymer type solidification agent (trade name: TG Lock)) manufactured by Technica Godo Co., Ltd. was used. Next, as shown in Fig. 7(C), similar to normal tamping repair (1 minute/point), tamping is performed using a conventional tie tamper to mix the ballast under the sleeper and the repair material. bottom. The applied load was a minimum load of 5 kN and a maximum load of 85 kN (load amplitude of 80 kN), and repeated loading was performed 300,000 times with a sine wave of a loading frequency of 5 Hz.

FIG. 13 shows test results showing the relationship between the number of loading times and the amount of sleeper settlement. The horizontal axis shown in FIG. 13 is the number of times of loading (10,000 times), and the vertical axis is the settlement amount (mm). Example 1 shown in FIG. 13 is the test result by the ultra-low-strength stabilization treatment method in the case of repairing once with ultra-fast-hardening cement and polymer flocculant. Example 2 is the test result of the ultra-low strength stabilization treatment method in the case of repairing twice with ultra-rapid hardening cement and polymer flocculant. Example 3 is a test result after re-repairing when normal repairing is performed using a normal tie tamper after repairing by the ultra-low strength stabilization treatment method of Example 2. A comparative example is a test result in the case of no measures.

The comparative example is a case where only tamping and repairing is performed with a normal tie tamper, and the fine particle content F _C =12%, indicating relatively advanced deterioration. Here, the fine grain content rate F _C is the ratio of the fine grain content in the ballast, and increases as the grain refinement progresses. It has been confirmed in laboratory tests that when the fine grain content F _C increases, the progress of track irregularity, which changes the shape of the rail in the longitudinal direction and in the lateral direction, increases. In the comparative example, when a cyclic loading test was conducted using ballast ballast having the same particle size distribution as the mud-pumping part, as shown in FIG. A subsidence of about 27 mm occurred after 300,000 cycles of loading.

On the other hand, in Example 1, by repairing once by the ultra-low strength stabilization treatment method, the amount of settlement after 300,000 cycles could be reduced to about 6 mm, as shown in FIG. As a result, it was confirmed that in Example 1, the amount of subsidence could be reduced by 78% compared to the comparative example in which no measures were taken. In Example 2, by repairing twice by the ultra-low strength stabilization treatment method, the amount of settlement after 300,000 times was able to be reduced to about 3.5 mm as shown in FIG. As a result, in Example 2, it was confirmed that the amount of settlement could be reduced by 87% compared to the case of no countermeasure in Comparative Example, and it was confirmed that the amount of settlement could be further reduced compared to Example 1 by repairing again. In Example 3, after repairing twice by the ultra-low strength stabilization treatment method of Example 2, normal repair was performed using a tie tamper. The amount of subsidence was about the same as the first stabilization method. As a result, in Example 3, even if the ballasted track subjected to the ultra-low strength stabilization treatment method as in Examples 1 and 2 was re-repaired using a normal tie tamper, a certain subsidence suppression effect was obtained. confirmed to be retained.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible as described below, which are also within the scope of the present invention.
In this embodiment, the case where the sleeper 4 is a concrete sleeper has been described as an example, but a wooden sleeper, a synthetic sleeper molded from foamed urethane resin reinforced with long glass fibers, or The present invention can also be applied to iron sleepers. In addition, in the third embodiment, the multiple tie tamper was described as an example of the maintenance heavy equipment E, but the present invention is not limited to the multiple tie tamper. It has a structure that can run on both tracks and roads by attaching an accessory device that has the same function as a multiple tie tamper to a backhoe. The present invention can also be applied to maintenance heavy machinery such as road rail vehicles.

1 roadbed 2 ballast track (track)
3 Rail 4 Sleeper 5 Track bed 5a Repair material injection hole 6 Track bed ballast 7 Repair ballast layer M Repair material T Tie tamper E Heavy equipment for maintenance

Claims (9)

A ballasted track repairing method for repairing a ballasted track that retains sleepers with ballast ballast with a repairing material,
A mixing step of mixing the existing ballast ballast under the sleeper with the repair material containing ultra-rapid hardening cement and a polymer flocculant but not containing water;
A ballast track repair method characterized by: In the ballast track repair method according to claim 1,
The mixing step includes mixing a repair material containing an acrylamide-based polymer flocculant and the existing ballast ballast;
A ballast track repair method characterized by: In the ballast track repair method according to claim 1 or claim 2,
A drilling step of drilling a hole in the ballast track toward below the sleeper;
and a repair material input step of inputting the repair material into the hole,
The mixing step includes a step of inserting the existing track bed ballast and the repair material under the sleeper with a tie tamper to mix the existing track bed ballast and the repair material;
A ballast track repair method characterized by: In the ballast track repair method according to claim 1 or claim 2,
including a repair material spraying step of spraying the repair material on the ballast track;
The mixing step includes a step of inserting the existing track bed ballast and the repair material under the sleeper with a tie tamper to mix the existing track bed ballast and the repair material;
A ballast track repair method characterized by: In the ballast track repair method according to claim 1 or claim 2,
including a repair material spraying step of spraying the repair material on the ballast track;
The mixing step includes a step of inserting the existing track ballast and the repair material under the sleepers by a heavy maintenance machine and mixing the existing track ballast and the repair material;
A ballast track repair method characterized by: A ballasted track repair material for repairing ballasted tracks by mixing with existing ballast on the ballast under sleepers,
Containing ultra fast hardening cement and a polymer flocculant and not containing water,
A ballast track repair material characterized by: In the ballast track repair material according to claim 6,
Containing an acrylamide-based polymer flocculant,
A ballast track repair material characterized by: A ballasted track that retains sleepers by ballast ballast,
Equipped with a repair ballast layer in which the existing track bed ballast under the sleeper is repaired,
The repair ballast layer is a mixture of the existing track bed ballast under the sleeper and a repair material containing ultra-rapid hardening cement and a polymer flocculant but not containing water;
A ballasted track characterized by A ballasted track according to claim 8,
The repair ballast layer is a mixture of a repair material containing an acrylamide-based polymer flocculant and the existing track bed ballast;
A ballasted track characterized by

Images