JPH0586601A - Improvement in track roadbed - Google Patents

Abstract

PURPOSE:To greatly reduce noise and vibration as well as improve the soft roadbed of railroad track in short time. CONSTITUTION:The soft roadbed soil is removed by a given depth portion, and a slag ballast containing 15-30wt.% fine grains passing 80X80mum meshes and passing 100% 30X30mum meshes, which is subjected to a sufficient mixing and hydrating process, is placed onto the roadbed. The slag ballast layer is compacted by rammer or others and set by hydration reaction to a necessary minimum compressive strength, where the ballast is constituted directly or through an elastic sheet, Tbe slab ballast is theta compressed by the weight of vehicles running and hardened completely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving a roadbed for a track.
It is used when continuously improving every 10 to 20 m by using a slag for repairing a roadbed with a specially adjusted grain size during an operation stop of 4 hours, reducing the construction time,
The present invention relates to a roadbed improvement method capable of further reducing noise and vibration.

[0002]

2. Description of the Related Art The applicant has previously developed a method for improving a roadbed for a track which is in commercial use by using a particle size adjusting slag according to the JIS standard, which is disclosed in JP-A-62-55301 and JP-A-63-55301.
It is open to the public as No. 27601. That is, the method for improving the track base course is to repair the base course with a length of 10 to 20 m as a construction unit during a train suspension time at night, etc. (a) The particle size is adjusted according to the JTS A1102 standard. After allowing the slag ballas to be sufficiently water-filled for a predetermined time, (b) laying the slag balls in a water-containing state on the roadbed to a predetermined thickness, and then applying a pressure of 4 to 5 rotations with an impact force of a rammer or the like. , (C) Moisture is extruded from the inside of the slag ballas by compaction to cause the slag layer to condense at a high speed within 2 to 3 hours from the inside, and the weight of the train or train running on the slag layer that has been condensed at a high speed. To cure for a long period of time, and (d) finally 100 to 120
It forms a slag subgrade having a compressive strength of about kg / cm ² .

In the method for improving a track base course using a slag for adjusting the grain size, the slag layer is condensed within a few hours after compaction to obtain a compressive strength of about ²⁰ to 30 kg / cm ^2. It is economically superior because it does not require temporary receiving of tracks or slow running that is required when improving roadbeds using asphalt concrete, and does not have many cracks like concrete roadbeds and asphalt concrete roadbeds. Even if one crack occurs, the hydration reaction will occur due to the intrusion of rainwater and the crack will be naturally repaired, there will be soundproofing and vibration damping effects, and the so-called mud spraying phenomenon of the track will be completely prevented. It has many excellent practical effects such as.

However, there are still many problems to be solved in the above-mentioned conventional method for improving the roadbed for a track. First, the biggest problem is that it takes a considerable amount of time to roll the slag ballas layer that has been laid, and even when the compressive strength of the slag ballas layer that has been rolled reaches the required minimum level (20 to 30 kg / cm ² ) even in the summer. It takes 2 to 3 hours, and as a result, it is possible to construct only a short distance of about 10 m overnight.

Therefore, it is recognized that a roadbed made of a sufficiently compacted particle size adjusting slag is superior in vibration damping and soundproofing, and in terms of cushioning property, it is superior to concrete roadbeds. There is. In addition, the effect of such reduction of vibration and noise and improvement of cushioning property is mainly that (a) the slag ballas themselves that make up the roadbed are porous, and an appropriate amount of holes are dispersed inside the slag ballas layer. And (b) the slag layer is a condensate formed by hydration reaction and has flexibility, and thus is obtained by the peculiar properties of the slag.

As a result, in the conventional method using the slag, the slag layer laid by the slag layer was subjected to the rolling compaction by using the slag having a very small particle size adjusting slag as shown in Table 1 which complies with the JIS A 1102 standard. The holes in the slag layer forming the roadbed are not completely blocked by the slag particles when the slag is solidified. If a large amount of slag fine particles are present in the slag ballas, they penetrate into the vacancies of the slag balas with a relatively large particle size and completely block them, and as a result, the vacancy density in the slag layer becomes extremely high. This is because the noise reduction effect and the cushioning performance are deteriorated.

[0007]

[Table 1]

However, in the conventional method, the slag used for adjusting the particle size is a slag ballast containing a relatively small amount of fine particles for the reasons described above, and therefore the slag layer after laying is necessarily bulky. As a result, the compaction of the slag layer after laying
It will take time and labor to compact it. For example, in the conventional method, the slag layer laid to a thickness of 30 cm is compacted to a thickness of about 25 cm, and the minimum necessary compressive strength is set to 3 after compacting. If you try to get it within ~ 4 hours, rammer (oil self-lubricating type, weight 80-100kg, frequency 5
(50 to 600 times / minute) requires 5 to 6 times of squeezing, which requires a considerable amount of time and labor for the squeezing operation.

Further, in the conventional method, since the fine particle component is small in the slag ballas used, the pores of the slag ballas having a large particle size are literally empty, and water will enter here after the hydrolyzing treatment. I'm just there. As a result, during compaction with the slag ballast, a more complete condensation hardening cannot be obtained unless the pores are deformed by a strong impact force until they are completely crushed, and relatively large pores are present in the slag layer. When a large amount remains, the weight per unit volume of the roadbed becomes small, and there is a problem that the vibration damping performance deteriorates.

[0010]

DISCLOSURE OF THE INVENTION The present invention provides the above-mentioned problems in the conventional method for improving a roadbed for a track using a particle size adjusting slag, that is, the compaction of the slag ballas by a considerably strong impact force. Moreover, if you do not do it 4 to 5 times or more,
Since the minimum required compressive strength cannot be obtained within 3 to 4 hours after hardening, and it takes time for hardening and subsequent setting and hardening, the construction distance per construction unit is 5
It is limited to 10 m (overnight construction), and it aims to solve problems such as poor economic efficiency, with a small amount of rolling pressure, and at the same time it is possible to advance the condensation hardening by hydration reaction more quickly It is intended to provide a method for improving a roadbed for a track, in which a required limit of compressive strength can be obtained early and a roadbed having excellent soundproofing and vibration damping performance can be formed.

[0011]

[Means for Solving the Problems] When forming a subbase using a slag ballas, if the slag particle size to be used is made fine and the fine particle component is increased, the bulkiness of the slag layer after laying is reduced and the compaction is performed. It is assumed that this is relatively easy and that the setting and hardening of the slag ballas due to the hydration reaction is accelerated. However, when the slag ballast containing a large amount of fine particle components is used as described above, all the pores of the slag ballast are blocked by the fine powder, which not only reduces the soundproof performance and cushioning property of the slag roadbed, but also the water permeability. It has generally been widely considered so far that the value also decreases and the setting and hardening action for a long time is stopped. As a result, it has been considered that the slag ballas with a small amount of fine particles should be used in the improvement work of the roadbed for tracks using the slag balls, and the use of the slag with a large amount of fine particles is not desirable.

On the other hand, the present inventor, in the process of setting hardening by hydration reaction of slag ballas, that is, in the process of testing the correlation between particle size of ballast, amount of compaction, setting hardening time, etc. I found two new matters. (A) Even if the slag balus is crushed and finely pulverized into a fine powder having an average particle size of about 20 to 80 μm, each slag fine particle still has a large number of micropores. Even if the amount of slag increases and fills the pores of the slag ballas with large particle size, the slag balas itself does not lose its air permeability and water permeability, and as a result, the aggregate of the slag balas also becomes a roadbed. Do not lose ventilation and water permeability. (B) Pre-cure slag fine particles are filled in the pores of a slag slag having a large particle size so that the compaction amount is smaller and the setting and hardening is more firm.

The present invention has been made based on the above knowledge, and is a method for continuously improving track roadbeds of railroads in operation at fixed intervals for a certain period of time. Part of the subgrade soil is removed to a certain depth, and 100% of the sieve mesh 30 mm × 30 mm that has been pre-cooked and sufficiently stirred and mixed and hydrolyzed is passed on the subgrade soil 80 μm × A slag ballas containing 15 to 30% by weight of fine particles passing through 80 μm is laid, and then the slag ballas layer is compacted by impact force of a rammer or the like to push out water from the slag ballas, and the slag ballas layer is hydrated from the inside. When the slag ballas layer is solidified to the minimum required compressive strength, a ballast ballast or a rigid block is laid directly above the slag ballas layer or with an elastic sheet material. However, by compressing and compressing the slag ballas through the roadbed ballast layer or the rigid block depending on the weight of the traveling vehicle, the slag ballast layer, which has been condensed and reduced in a short time, can be completely completed for a long time. The basic constitution of the invention is to cure and harden.

[0014]

The slag ballast containing 15 to 30% by weight of the fine particle component is pre-cured and sufficiently mixed by stirring. As a result, the slag fine particles are filled in the pores of the slag ballas having a large particle size, and the corners of the slag particles having a large particle size are removed, so that the slag particles are rounded. The slag ballas mixed by stirring are sufficiently watered, left for 4 to 8 hours as if they were soaked in water, and then drained 2 to 3 hours before laying. As a result, water is contained in the micropores in the slag ballas, and the water content is about 8 to 15% by weight.

When an impact compressive force is applied to the slag layer laid to a predetermined thickness by a rammer or the like to perform compaction by so-called compaction, hydration reaction occurs due to water stored in the pores of the slag. It grows and the condensation of the slag ballas begins. In this case, a large amount of slag fine particles are filled in the pores of the slag sphere with a large particle size during stirring and mixing, and these process fine particles are extruded together with water due to the compaction, and the slag spheres with a large particle size are intermixed. Fills the voids in between. As a result, the hydration reaction proceeds more rapidly and the rate of setting and hardening increases, as compared with the case of the conventional method using a particle size adjusting slag having a small content of fine particles.

Since each slag fine particle has a large number of micropores, the content of the fine particle in the slag is 15 to 30% by weight.
Even if it is high, there is no possibility that most of the holes in the roadbed will be blocked and the soundproofness and cushioning performance will not deteriorate, but on the contrary, the roadbed density will rise to an appropriate value, and Etc. are further improved.

Further, the vibration load due to the weight of the vehicle is transmitted to the slag layer through the ballast layer of the roadbed or through the sheet material by the traveling of the vehicle, and the slag layer is compressed for a long period of time. As a result, the slag layer is very efficiently and evenly compressed by the vehicle weight, which continues to accelerate the setting hardening and after 3-4 months 100-120 kg /
A strong bell-shaped slag bed is formed with a compressive strength of cm ² .

In addition, rainwater and the like penetrate into the inside through the fine pores of the slag baseboard, which causes the setting and hardening due to the hydration reaction to continue for a long time, and should the slag baseboard crack, The hydration reaction causes natural repair of cracks. In addition, the micropores of the slag roadbed are large enough to prevent the flow of mud particles, and the so-called orbital mud blowing phenomenon is eliminated in combination with the natural repairing action of the cracks.

[0019]

1 is a vertical cross-sectional view of a railroad track embodying the present invention. In FIG. 1, 1 is a roadbed (roadbed soil), 2 is a slag layer, 3 is an elastic material sheet, and 4 is a roadbed. Barras, 5 is a PC sleeper, and 6 is a rail. In the case of improving a soft roadbed portion (for example, a railroad crossing portion) of a conventional railroad track according to the present invention, first, the upper layer portion of the roadbed ballast of the soft roadbed portion is removed, and the sleepers in between are loosened and pushed to one side. Or, remove it temporarily. Next, the roadbed ballast under the sleepers and the roadbed immediately below the sleepers are removed by plow over a depth of about 200 to 250 mm. Further, before the start of the improvement work, the adjusted slag ballas 7 is sufficiently stirred by a pre-clamping Yumbo or a stirrer, and water is added to the adjusted slag ballus 7 so that it is soaked for 3 to 8 hours.

When the plow removal of the roadbed is completed, water is added to the degree of soaking, and the adjusted slag ballas drained 2-3 hours before are laid in the plow-taking portion of the roadbed to a thickness of 20 to 30 cm. .. As the adjusted slag ballas, 30 mm x 30
100% through 80 mm sieve and 80 μm × 80 μ
The slag ballast containing 20 to 30% by weight of fine particles capable of passing through the sieve of m is the best.
80 μm × 80 separately formed on 85% by weight of the slag that has passed the aggregate sieving test specified in 1102
Fine slag particles with a particle size that passes 100% through a sieve of μm 15
The slag ballas mixed with weight% is used. It should be noted that sprinkling of water at the time of laying is almost unnecessary, and the water content of the slag ballas is maintained at about 10 to 15% by the water absorbed at the time of water addition.

The maximum grain size of the slag ballas is sieved 30
In order to control the particle size to pass 100 mm x 30 mm, if a ballast with a maximum particle size larger than this is mixed, it becomes difficult to compact the slag ballas, and it takes more time, and the hydrated slag balls are hydrated. This is because the reaction progress rate partially varies.

In addition, a sieving mesh of 80 μ is provided in the slag ballas.
The inclusion of 20 to 30% by weight of fine particles that pass 100% through m × 80 μm can minimize the compaction time at the content of the fine particles of 20 to 30% by weight, and the minimum required by hydration reaction. Compressive strength (20-30kg / c
This is because m ² ) can be quickly obtained, and the best results can be obtained in terms of anti-vibration performance and cushioning property. When the content of the fine particles is less than 20%, the time until the required minimum compressive strength (20 to 30 kg / cm ² ) is obtained is extended, and when the content of the fine particles exceeds 30%, soundproofing is achieved. In addition to the deterioration of the cushioning and cushioning properties, the cost of slag ballast will rise and the economy will be lacking.

When the laying of the slag ballas is completed, the surface layer is squeezed 2-3 times with a rammer or the like. The rammer used is an oil self-lubricating weight of 80.
-100 kg and a frequency of 550 to 600 times / minute are optimal. Since the slag ballas are porous, they are compacted by rolling by a rammer, and the slag ballas layer 2 having a laying thickness of 30 cm is compacted to a thickness of about 25 cm by rolling 3 to 4 times. In addition, after about 2 hours have passed from the completion of the hardening, it is condensed to a level having a compressive strength of 20 to 30 kg / cm ² . When the compaction of the surface layer of the slag balm is completed, it is directly or on the elastic material sheet 3 (for example, an SBR synthetic rubber sheet having a water passage hole having a thickness of 25 mm).
After laying, the ballast ballast 4 is laid about 250 mm thick.

[0024] Also, when the floor covering 1 is finished,
Finally pull back the sleepers 5 to the predetermined position, and set them on the rails 6.
After fastening to, fix the ballast ballast 4 and squeeze it. Length of slag as described above 10
Repeat every night for every 30m section as a unit to repair a predetermined length of trackbed.

The slag ballas layer 2 forming the roadbed has not yet sufficiently and completely caused the so-called hydration reaction to cause hardening and hardening immediately after its laying and compaction, but the passage of the vehicle causes the ballast ballast layer to be dispersed. The lower slag layer 2 is uniformly compressed and compacted via 4 for a long period of time, and is successively set and hardened while receiving the compressive force. That is, when the vehicle travels on the rail 6, the weight of the vehicle is transmitted to the slag layer 2 through the ballast layer 4 and the slag layer 2 is compressed and compacted by the upward and downward vibrations of the ballast layer 4. It will be. on the other hand,
In the slag layer 2, the amount of water required for the pre-hydration reaction is added when the slag layer is laid, and the surface layer of the slag layer 2 is hardened when the slag layer is laid so that water vaporizes. Is prevented. Moreover, since the slag layer 2 is appropriately watered by rainwater or the like, the slag layer 2 is continuously hardened from the inside thereof while being compressed and compressed by the weight of the vehicle as time passes, and the slag layer 2 is continuously hardened for 3 to 4 months. Later 100-120kg / c
An extremely strong slag subgrade having a compressive strength of about m ² is formed.

[0026]

Industrial Applicability In the present invention, a slag ballast containing 20 to 30% by weight of fine particles which pass through 100% of sieves 30 mm × 30 mm which have been premixed and sufficiently stirred and which pass 100% of sieve 80 μm × 80 μm. Water is added to the slag, and the slag ballas with the necessary water content inside the pores are used. As a result, the corners of the large particle diameter can be removed by stirring, and since the amount of fine particles is large, the density of the slag layer after laying can be increased, and the rolling compaction work efficiency can be significantly improved. In addition, since the amount of fine particles is large, the fine particles are sufficiently naturally filled into the large pores of large size during agitation and mixing, and the fine particles filled by the rolling force are extruded into the gaps between the separate balls. Be done.
As a result, the hydration reaction after the compaction will proceed evenly over the entire inside of the slag layer, and the time required to obtain the necessary minimum compressive strength (20 to 30 kg / cm ² ) will be greatly increased. As a result, the waiting time required for curing can be shortened by about 60 minutes as compared with the conventional method. Furthermore, since a large amount of fine particles are sufficiently filled in the large cavities and the fine particles themselves have many fine holes, the density of the roadbed formed by condensation is homogenized and its value Becomes higher, and the vibration damping property is improved. According to the result of the actual measurement test, the vibration isolation performance is improved by about 3 to 5 dB as compared with the case of the conventional method.

In addition, it goes without saying that the following effects can be obtained in the present invention as in the case of the conventional method. Since the slag layer that has been set and hardened has appropriate flexibility,
No cracks will be generated due to vehicle vibration or the like, and even if a crack should occur, the hydration reaction is restarted by supplying rainwater and the crack is repaired. As a result, the mud-blowing phenomenon of conventional concrete roadbeds is eliminated. The slag roadbed has many small holes inside it.
This allows water to permeate. However, the mud particles cannot pass through the fine pores, so that the viscosity of the track bed becomes mud and is never ejected into the orbit. When the elastic sheet material is laid on the slag layer, vibration noise is significantly reduced, and the sheet material acts as a separator, and the slag layer and the ballast ballas layer do not move up and down as a unit. Each of them vibrates up and down as a separate body.
As a result, the ballas layer performs the same function as the compactor, the slag layer is efficiently and evenly compressed for a long period of time, and a stronger slag roadbed is formed. INDUSTRIAL APPLICABILITY As described above, the present invention has an extremely high practical utility in improving the trackbed of a railroad that is in operation within a short period of time such as midnight operation suspension.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a railway track for carrying out the present invention.

[Explanation of symbols]

1 is roadbed (roadbed soil) 2 is slag layer 3 is sheet material 4 is roadbed ballast 5 is sleeper 6 is rail

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Yasui 2-8-30 Terada-cho, Tennoji-ku, Osaka City Nihon Technology Construction Co., Ltd. (72) Mitsuo Minamino 2-chome 2-chome, Terada-cho, Tennoji-ku, Osaka No. 30 Japan Technology Construction Co., Ltd.

Claims (1)

[Claims] 1. A method for continuously improving a railroad trackbed of a railway under operation at regular intervals for a certain period of time, wherein the roadbed soil at the soft portion of the roadbed is removed over a certain depth. ,
On the subgrade soil, 100% of the sieve mesh 30 mm × 30 mm that has been thoroughly stirred and mixed and hydrolyzed in advance is passed through, and fine particles that pass through the sieve mesh 80 μm × 80 μm of 15 to 30
The slag ballas containing wt% is laid, and then the slag ballas layer is compacted by impact force such as rammer to push out water from the slag ballas, and the slag ballas layer is condensed by hydration reaction from the inside and When the slag ballast layer is set to a compressive strength, a ballast ballast or a rigid block is laid directly above the slag ballast layer or with a sheet material made of an elastic material, and the above-mentioned ballast bed is placed according to the weight of the traveling vehicle. An orbit characterized by completely solidifying and hardening the slag ballas layer, which has been condensed and reduced in a short time, by compressing and compressing the slag ballas through a ballast layer or a rigid block. Roadbed improvement method.