JPS6055101A - Reinforcement of balast track - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a ballast 1 in a ballast track, a ballast 1 in which a cement asphal 1 reinforced with a long fiber mantle and a mortar layer are provided on the lower surface of the sleepers on the track bed and in the space around it.
- Concerning track reinforcement construction methods.

Ballast 1 track is the type of track that occupies most of the conventional railway lines, and its structure consists of a ballast bed on the roadbed, and sleepers and rails on the ground. and,
This structure absorbs the load and vibration energy caused by passing trains by deforming the ballast. When rain falls on the ballast track, the rainwater percolates and softens the roadbed beneath the track bed, causing the ballast track bed to sink. In addition, over time, the surface of ballast tends to wear down and become finer due to the effects of train loads, vibrations, and rainwater. It rises between the stone grains of Balasu 1 and causes a mud spouting phenomenon, which causes the subsidence of the Ballast 1 and the trackbed and solidification of the ballast, causing major orbital deviations. For this reason, in the ballast orbit, - Replenishment of new ballast, screening of ballast, or removal of fine particles by replacement. Furthermore, it is necessary to plan and carry out regular track maintenance work such as correcting track deviations.

BACKGROUND ART In recent years, with the increase in transportation volume, railways have been forced to increase the speed of running vehicles and the amount of vehicles passing on many routes, including major trunk lines.

On the other hand, in terms of track structure, in order to ensure economy and safety, it has long been necessary to strengthen railway tracks and save labor, and for this purpose, club tracks were developed.
It has been adopted for newly constructed lines such as the Shinkansen.

Even with conventional ballasted tracks, track maintenance is labor-saving.
In other words, there is a need for the development of a track that can reduce track maintenance work and ensure safe transportation.

Paved tracks were developed to meet these demands.

The paved track is mainly intended for conventional lines.I) The sleepers and upper ballast of the existing ballast track are removed, the remaining ballast surface is compacted, and large sleepers (referred to as LPG) are arranged there. Then, about 20 gaps are created between the lower surface of the LPC and the upper surface of the ballast, and heated and molten special asphalt is injected into the spaces to fill the gaps and fill the gaps in the upper part of the ballast. Let it seep into
The ballast around the LPG is solidified. Furthermore, the trackbed surface is paved with a cutback asphalt mixture. However, in this method, heated and molten asphalt is injected, so there is a seasonal problem in the winter because the asphalt cools quickly when injecting asphalt, so there is enough asphalt in the required place. It does not seep through and may harden during the process, and the temperature of the injected heated asphalt is slow to drop in the summer, making it difficult to manage construction, as it takes a long time to develop strength.

The present invention can save labor in track maintenance work on ballast tracks, and eliminates problems caused by injection of heated asphalt on paved tracks, and because construction is performed at room temperature, reliable construction is possible regardless of the season. In addition, a long fiber mantle is interposed in the necessary solidified layer to provide a method of reinforcing the ballast track that is horizontally striated by room-temperature filling.

That is, the present invention interposes long fiber mats on the lower surface of the sleepers and around the sleepers in the ballast track,
Add cement and bituminous emulsion and, if necessary, bone
．． The gist of this method is to strengthen the ballast track, which is characterized by mixing admixtures, water, etc., injecting and filling the nalcement asphalt mortar (hereinafter referred to as CA mortar), and curing it.

The ballast track reinforcement method of the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view showing an outline of a ballast track strengthened by the construction method of the present invention, and FIG. 2 is a sectional view of FIG. 1.

In the figure, (1) is the ballast trackbed, (2) is the sleeper, (3) is the CA mortar injection port provided on the sleeper (2), and (4) is the rail. (5) is the lower surface of the sleeper (2) and the reflective space around it. (6) is the blocking layer, which is the track bed ballast facing the luminescent space (5).
It is set in the second. (7) is a long fiber mat,
It fills the reflective space (5). (8) is a CA mortar made by mixing cement and bitumen emulsion, and further, if necessary, aggregate, admixture, water, etc. (91U: Reinforced roadbed such as I concrete. s” (10) is waterproof surface pavement.

The ballast track strengthening method of the present invention is shown in Figures 1 and 2.
The procedure will be explained step by step based on the diagram. First, the ballast located above the ballast track bed (1) is removed to create a daylight space (5). The flared space (5) ballast surface is adjusted and compacted. This reflective space (5) ensures a uniform thickness on the lower surface of the sleepers (2). Radiant space (
A barrier layer (6) is provided on the ballast surface in contact with 5).

This blocking layer (6) prevents the KCA mortar (8) from seeping into the ballast excessively when injecting the CA mortar (8) into the reflective space (5), and maintains an average and uniform thickness. Provided to form a CA mortar (8) layer. Various types of barrier layer (6) can be used as described below.

The thickness of the reflective space (5) is about 2 to 10 cm at the lower surface of the sleeper (2), and usually about 5 to 6 brocades. Therefore, the lower surface of the sleeper (2) and the dim light space around it (
A long fiber mat (7) is laid over 5). If necessary, use long fiber mats (7
) to reinforce this. Next, place the CA mortar (81 Womakuragi) in the sunlight space (5).
Inject from the injection port (3) in 2).

The CA mortar (8) fills the gaps between the fibers of the long fiber pine l-(7), covers the fibers, and fills the reflective space (5) without any gaps. This CA mortar (8
) is cured, a waterproof surface pavement f101 is applied to the surface of the ballast track bed (1), thereby completing a ballast track strengthened by the construction method of the present invention.

Next, materials used in the construction method of the present invention will be explained.

The long fiber pine l-(71) used in the present invention refers to synthetic fibers such as glass fiber, polyester, polyamide, polyimide, aromatic polyamide, polypropylene, vinylon, acrylic, polyvinylidene chloride, and polyvinyl chloride;
Fibers such as carbon fibers and metal fibers, such as single fibers, strands of multiple single fibers bundled with a binding agent, continuous fibers such as single threads, twisted threads, and twisted threads, or at least 30 m long.
The fibers are cut into lengths of m or more and usually stacked in a non-directional manner to terminate the fibers and form a mat of an appropriate thickness. Some of these mat-like mats are partially treated with a method to prevent the fibers from falling apart, such as by using bonding or needle punching, or some are not treated with these methods. can also be used. These long fiber pine l-(71) are made of bulky material so that the thickness of the luminescent space (5) changes depending on the finishing accuracy of the compacted ballast surface, so that it is sufficiently pushed into the four parts and supported as a whole. Preferably.

A typical long-fiber pine mat 7) is a mat made by stacking continuous fibers of glass fiber strands in a bulky manner.

CA mortar (8) used in the present invention, namely cement and mortar i! : l'emulsion, as well as bone phase and admixtures.

A publicly known asphalt mortar made of a mixture of water and the like is used. In other words, conventional techniques are used for the ingredients, formulations, etc. that constitute these.

Examples of materials include cement such as Portland cement, blast furnace cement, solica cement, blast furnace colloidal cement, colloidal cement, jet cement, alumina cement, and sulfate-resistant cement.

These may be used alone or in combination. Along with these cements, admixtures such as cement shrinkage compensators, hardening accelerators, hardening retarders, AE agents, dispersants, thickeners,
Water reducing agent, foaming agent. Antifoaming agents and the like can also be used together.

! Blue emulsion c, straight asphalt asphalt, semi-prone asphalt, petroleum asphalt from deflated asphalt. One type selected from natural asphalts, tars, pitches, etc., or two or more types. or modified bituminous materials by adding and mixing rubber, synthetic polymers, etc. Emulsifying agents such as surfactants, amphoteric surfactants, bentonite, etc. as main emulsifying agents, and emulsifying agents, dispersants, stabilizers, protective colloids, etc. as necessary, and emulsifying them in water. Rubber latex, synthetic polymer emulsion, synthetic resin emulsion, water-soluble polymer, water-soluble synthetic resin, etc. are added to and mixed with the bitumen emulsion. Furthermore, a mixture of a water-soluble or emulsified epoxy resin and a reactive resin such as a curing agent for the epoxy resin can also be used.

Generally, asphalt-based bitumen emulsions are used. The concentration used is one in which the evaporation residue is about 55 to 70% and the penetration degree (at 25° C.) of the evaporation residue is about 30 to 400.

The aggregate is fine aggregate. Fine bone fragments have a grain size of 25 stones or less, and a coarse grain ratio in the range of 1 to 25.

Examples include river sand, sea sand, mountain sand, borax sand, sand made by sintering ash, iron sand, and foundry sand. In addition, along with bone structure, glass powder,
Borax powder, diatomaceous earth, mica powder, mica pieces, 1 pen - 1 knife
-, clay, stone powder, fly ash, anhydrous silicic acid powder, normal phase, carbon black, gun 7ite, and other soilers can be used. These can also be used after being dispersed in water. Furthermore, colloidal 7-liquor can also be used.

As water, fresh water is generally used. That is, tap water, industrial water, and groundwater. This includes river water.

CA mortar (8) contains 0.1 to 5 parts of bitumen emulsion (converted to 600 parts by weight of evaporation residue) and 0 to 6 parts of aggregate (as sand) per 1 part by weight of cement (hereinafter simply referred to as part). , usually used in a proportion of 0 to 2 parts. Cement shrinkage compensation fee,
When using a hardening accelerator, etc., add it to the amount of cement in the above mixing ratio. Water is used as appropriate, taking into account the workability of the CA mortar (8). When using a foaming agent, for example, when using aluminum powder, it varies depending on the amount of bubbles introduced into the CA mortar (8). is generally used in a range of 0.005 to 0.002% by weight of the amount of cement. The volume ratio should be within the range of .2 to 5.The larger the amount of long fiber pine I-(7) used, the more the reinforcing effect of the fibers can be exhibited, and the tensile strength 1 bending strength, flexibility, impact resistance However, when the volume ratio exceeds 5, the injection filling of the CA mortar (8) into the gaps of the long fiber pine l-(71) becomes poor.

In addition, when the volume ratio is less than 02, the long fiber mat (force reinforcement effect cannot be fully exerted.This long fiber mat (
Reinforcement according to 7) can also be performed intensively. For example, the reinforcing effect can be further improved by increasing the amount used in areas where stress is concentrated.

The following materials can be used for the blocking layer (6). In addition to natural fibers, synthetic fibers, plastics, non-woven fabrics, woven fabrics, knitted fabrics, reticulated fabrics, mesh fabrics, netting, gold netting, etc., bituminous waterproof sheets, rubber waterproof sheets 1-
, plastic-based waterproof sorts can also be used. Alternatively, the rough surface of the ballast surface may be crushed and crushed stone, fine aggregate, filler, rubber powder, etc. may be spread thereon to form a compaction barrier layer (G). In addition, thin layers of paving with cold-applying bituminous emulsions or cut-bank asphalt mixtures, surface treatments with permeable bituminous emulsions, and paving with heated asphalt mixtures (e.g., asphalt concrete) can be applied to the ballast to form a barrier layer ( 6) can also be used.

In addition, a barrier layer (Gl) can be obtained by spraying a sealing material of a rubber latex asphalt emulsion that can be applied at room temperature on the ballast surface, or a barrier layer (6) can be obtained by spraying heat-injection rubber asphalt. Further, the various barrier layers described above can be combined to form the barrier layer (6).

The waterproof surface pavement 00) can be the same as the conventional one.

Next, the features and effects of the ballast track reinforcement method of the present invention will be explained.

(1) C reinforced with long fiber cloak on the underside of sleepers
By providing the mortar layer A, it is possible to create a ballasted track structure with excellent performance against train loads, vibrations, shocks, shear forces, etc. The CA mortar layer reinforced with long fiber mats has excellent waterproof properties, so it can block rainwater from entering the ballast, preventing softening of the roadbed and mud blowing.

(2) According to the experiments conducted by the inventors, the CA mortar layer reinforced with long fiber mats was more effective than conventional OCA mortar alone and short fiber reinforced CA mortar.

Performance such as 1 impact resistance, stone J flexibility, and strength are several steps higher.

(3) Because construction is carried out at room temperature, there is no time required to heat and melt the asphalt and there is no danger associated with the use of fire compared to heating methods. In addition, it can be applied throughout the year regardless of the dryness or humidity of the ballast, and the required strength development time can be adjusted by selecting the CA mortar composition. - From the above, the reinforced ballast track constructed by the construction method of the present invention is a CA reinforced with long fiber mats.
By reliably forming the required solidified layer on the underside of the sleepers in the mortar, it is possible to prevent the bed ballast from becoming finer. Therefore, track maintenance work such as ballast replacement work can be significantly reduced.

Next, we will examine the experimental results regarding the physical properties of long fiber mat reinforced CA mortar. CA
Shown in comparison with mortar.

[Materials used in the experiment]

Cement: Jet cement l- (product name) manufactured by Onoda Cement ■ Asphalt emulsion manufactured by Nikkai Kagaku Kogyo ■ Emulsion A (product name) Asphalt emulsion for mixing nonionic cement Evaporation residue 60 weight scale Evaporation residue needle Intensity 109 Fine aggregate: Toride river sand FM: 1.56 Water: Tap water Aluminum powder: Medium-high metal C-250 long fiber mat: Asahi Glass Continent strand mat l-C8
M (product name) 6009/n? Rigid alkaline glass fiber strands are piled up bulky to form a mat so that they are continuously entwined without cutting. Short fibers (length 12 mm): Chopped strands of alkali-resistant glass fiber made by Asahi Glass. Length: 2 strands [Test method] (11 Flow time According to the Brepact Conc 1,1-T guideline draft prescribed by the Japan Society of Civil Engineers. Flow time is measured using J-Ro 1.

(2) Compressive strength and bending strength test JIS R5201r Physical test method for cement.

Load loading speed: 1 easy/min (3) Impact test Use a Page impact tester.

Size of specimen 5°li+×1(fT″X 1007
1 Place a plunger (a spherical body with a tip diameter of 2 brocades and a weight of IK7) on top of the specimen, and place an iron mallet (a weight of 2
．． 4. 7) is dropped from a height of 1 m.

Measure the number of drops until cracks appear on the specimen.

Experiment 1 The composition of the CA mortar and the mixture composition are shown in Table 1.

Table-1 Mortar mixer (standard rotation speed 150 times/min 1 rotation speed 1
= J variant), put the asphalt emulsion, water, antifoaming agent, and jet setter into a mortar mixer and mix for about 1 minute.
Mix at 5 times/minute, then add jet cement and mix for about 1 minute.
Mix at 150 times/min. Next, fine aggregate and aluminum powder are added and mixed at 115 times/minute. After kneading 1
Measure the flow time after 0 minutes, 20 minutes, and 30 minutes. The results are shown in Table-2.

Table 2: Preparation and testing of long fiber mat reinforced CA mortar specimens. Cut the long fiber mat (approximately 2 an inch thick) into a size of 4 x 16 m, and place it in a mold for making the specimen (4 x 4 x 16 cm).
In n), the amount of fiber is 10% by volume of CA mortar (% outside)
The above-mentioned CA mortar was injected and filled into the mold and cured to form a long fiber pine I/reinforced CA mortar, and its compressive strength and bending strength were measured. In the bending strength test, even when the maximum load was reached, the bending progressed, but no cracking occurred, so the test was terminated. The impact test was carried out using a formwork (specimen size 5 cm).
A required amount of long fiber cloak was cut in the same manner and placed in a space (x 10 cm x 10 cm), then CA mortar was injected and filled, hardened, and a test piece was constructed and subjected to an impact test. As a result, even after 60 impact tests,
No deformation was observed in the specimen. The order for testing on specimens is dated the 28th. These test results are shown in Table-3. Furthermore, Fig. 3 shows the condition of the specimen immediately after the impact test. Further, FIG. 4 shows the relationship between bending strength and displacement amount, and FIG. 5 shows the relationship between compressive strength and displacement amount.

In addition, CA mortar with standard formulation without adding fiber,
A short fiber man who premixed short fibers (glass fiber chopped strand length 12 mm) in the CA mortar, Q
CA mortar (the order of addition of fibers is asphalt emulsion,
Water was added in this order, and then other materials were added) (fiber addition amount: 0.6% by volume), a ratio-axis nodule specimen was prepared in the same manner as in the experimental example, and the test was conducted in the same manner as in the experimental example. Did 6
The results are also shown in Table 3, FIGS. 3, 4, and 5.

Table-3

[Brief explanation of drawings]

In the drawings, FIG. 1 shows an embodiment of the ballast track reinforcement method according to the present invention, and is a plan view of a reinforced ballast track. FIG. 2 is a cross-sectional view of FIG. 1. Figure 3 shows
FIG. 3 is a plan view of a specimen showing the results of a value group test. FIG. 4 is a bending strength-displacement curve diagram in a bending strength test. Figure 5 shows
It is a compressive strength-displacement curve diagram in a compressive strength test. The symbols in the figure can be explained as follows. (1) is the track bed ballast (2) is the sleeper (3) is the sleeper inlet (4) is the rail (5) is the daylight space (6
) is the barrier layer (force is long-fiber pine l-(8) is CA mortar (9) is reinforced roadbed such as concrete α ■ is waterproof surface pavement Patent applicant Japan I1 Railway Nichirei Chemical Co., Ltd. 0 l 234 & Bustle Standing 1 (Crew) 15 Prisoner Amount (Mre) Procedural Amendment (Method) (% Formula % 1, Incident Display Showa-['58 Patent Application No. 16264.2 2 Invention Name of ballast track reinforcement construction method 31 One knife, one thread with the case of the person who did the mountain correcting! Shikito Terakichi 6-5 Marunouchi-chome, Chiyoda-ku, Tokyo (41,4) 8 Country I 1 Railway President Hitoshi Iwao Sugi and 1 other person, 1 agent, 6-5-4 Shinbashi, Minato-ku, Tokyo Daily amendment order Method % Formula %: 3 Subject of amendment (1) "Detailed description of the invention" and "Drawings" in the specification Item (2) "L-Figure 3 in the drawings" Contents of the amendment (1) l'-;:1'<
First, correct "Figure 3" to "Figure 3 (1)". (2) Addendum 16 of the same page, 1. Figure 3, is amended to 1-Figure 3 (2) and (3). (3) Specification 1), (2), and (3).All of them are plan views of the specimens showing the results of the Qiji palm test. It was shown that it was sound after one coat of the test, and the third
Figure (2) shows that the specimen of Experiment No. 2 (comparative example) was cracked to "/2" after 8 impact tests, and Figure 3 (3)
indicates that cracks were generated in the specimen of Experiment No. 3 (comparative example) after 28 impact tests. Amendment 1 to ``. (4) First, correct Figure 3 in the drawings as per the attached sheet. 3 prisoners

Claims (1)

[Claims] In the ballast track, a long fiber mat is interposed on the underside of the sleepers and around the sleepers, and a seven-layer asphalt mortar is made by mixing cement and warm blue emulsion, and if necessary, aggregate, admixture, water, etc. Ballast 1 and track strengthening method 3 are characterized by injection filling and hardening.