JP2959891B2 - Improvement method of track base - Google Patents

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 track base, and uses a soft track base for a railway track in business use during nighttime.
It is used in the case where the operation is suspended for up to 4 hours, and it is used in the case of sequentially and continuously improving each of about 10 to 20 m by using the roadbed repair slag whose grain size has been specially adjusted.
The present invention relates to a method for improving a roadbed which can further reduce noise and vibration.

[0002]

2. Description of the Related Art The applicant has previously developed a method of improving a roadbed for track use in service using grain size-adjusting slag according to JIS standards, which has been disclosed in Japanese Patent Application Laid-Open Nos. 62-55301 and 63-55301.
No. 27601, respectively. That is, the above-mentioned method of improving the trackbed is to repair the roadbed with a length of about 10 to 20 m as a construction unit during the suspension of operation of the train at night or the like. (A) Particle size adjustment according to the standard of JTS A 1102 The slag ballast having been subjected to the above process is preliminarily timed so that the slag ballast is sufficiently filled with water, and (b) the slag ballast in a hydrated state is laid to a predetermined thickness on the bedrock soil, and then subjected to an impact force of 4 to 5 by a rammer or the like. (C) A train or train that runs on the slag layer that has been subjected to high-speed condensation while (c) extruding moisture from the inside of the slag ballast by means of compaction to cause the slag layer to solidify at a high speed within 2 to 3 hours from the inside. And (c) finally cured for 100 to 12
It forms a slag roadbed having a compressive strength of about 0 kg / cm ² .

[0003] In the method for improving a trackbed using the above-mentioned grain size-adjusted slag, the slag layer condenses within several hours after compaction to obtain a compressive strength of about ²⁰ to 30 kg / cm ^2. In the case of roadbed improvement using asphalt concrete, it is not necessary to temporarily support or slow down the track, which is necessary, and it is economically superior.There is no frequent occurrence of cracks like concrete roadbed and asphalt concrete roadbed. Even if one crack occurs, the hydration reaction occurs due to rainwater intrusion and the crack is naturally repaired, it has soundproofing and vibration-proof effect, and the so-called track muddy phenomenon is completely prevented And many other excellent practical effects.

[0004] However, there are still many problems to be solved in the above-mentioned conventional method for improving the track bed. First, the biggest problem is that it takes a considerable amount of time to compact the laid slag ballast layer, and even in summer, the compressive strength of the compacted slag ballast layer reaches the minimum required (20-30 kg / cm ² ). Two to three hours are required, and as a result, only a short distance of about 10 m can be constructed overnight.

[0005] It is recognized that a roadbed made of a sufficiently compacted particle size-adjusted slag is excellent in vibration-proofing and sound-proofing properties, and is superior to a concrete roadbed in terms of cushioning properties. I have. The effects of reducing vibration and noise and improving cushioning properties are mainly due to the fact that (a) the slag ballast constituting the roadbed itself is porous, and an appropriate amount of pores is dispersed in the slag ballast layer. And that the (b) slag layer is obtained by properties unique to slag, such as being an aggregate formed by a hydration reaction and having flexibility.

As a result, in the conventional method using slag, a slag having a very small particle size as shown in Table 1 which conforms to the JISA 1102 standard is used as the slag, and the slag layer is laid by rolling. When polished, the holes in the slag layer forming the roadbed are prevented from being completely closed by the slag particles. If a large amount of fine slag particles are present in the fine slag ballast, the fine slag particles penetrate into the pores of the relatively large slag ballast and completely close the pores. As a result, the pore density in the fine slag layer becomes extremely high. This is because the sound insulation effect and the cushioning performance are deteriorated.

[0007]

[Table 1]

However, in the conventional method, since the slag used for adjusting the particle size is a slag ballast having a relatively small content of fine particles for the above-described reason, the slag layer after laying is necessarily bulky. As a result, the compaction of the slag layer after laying
It takes time and effort to grind, for example, in the conventional method, grind a slag layer laid to a thickness of 30 cm to a thickness of about 25 cm, and then grind the minimum compressive strength to a minimum of 3 cm. If you try to get it within 4 hours, use a rammer (oil self-lubricating type, weight 80-100 kg, frequency 5
(50 to 600 times / min), 5 to 6 times of consolidation are required, and the consolidation work requires a considerable amount of time and labor.

Further, in the conventional method, since the fine particle component is small in the slag ballast to be used, the pores of the slag ballast having a large particle diameter are literally empty. I'm just there. As a result, when compacting the slag ballas, if the cavities are not deformed until they are completely crushed by a strong impact force, more complete setting and hardening cannot be obtained, and a relatively small amount of Since a large amount of large holes remain, the weight per unit volume of the roadbed becomes small, and there is a problem that the vibration isolation performance is reduced.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problem in the conventional method of improving a trackbed using a particle size-adjusted slag, that is, the crushing of a slag ballast by a considerably strong impact force. Moreover, if you do not perform 4-5 times or more,
The required minimum compressive strength cannot be obtained within 3 to 4 hours after crushing, and it takes time for crushing and subsequent setting and hardening.
It is limited to 10m (overnight construction) and is intended to solve problems such as poor economical efficiency. It requires only a small amount of compaction and accelerates the setting and hardening due to the hydration reaction. It is an object of the present invention to provide a method for improving a trackbed which enables formation of a roadbed having a required limit of compressive strength at an early stage and excellent soundproofing and vibration-proof performance.

[0011]

Means for Solving the Problems When a roadbed is formed using a slag ballast, if the slag particle size used is increased and the fine particle component is increased, the bulkiness of the slag layer after the laying is reduced and the compaction pressure is reduced. It is assumed that the slag can be performed relatively easily and the setting hardening due to the hydration reaction of the slag ballast is accelerated. However, when a slag ballast containing a large amount of fine particle components is used as described above, all pores of the slag ballast are closed by fine powder, which not only deteriorates the soundproofing performance and cushioning properties of the slag roadbed, but also reduces water permeability. It has heretofore generally been considered that the temperature decreases and the setting hardening action for a long time stops. As a result, in the improvement work of the track base using the slag ballast, it has been conventionally considered that the slag ballast having a small fine particle component should be used, and the use of the slag ballast having a large fine particle component is not desirable.

On the other hand, the inventors of the present invention conducted a setting and hardening test by hydration of slag ballas, that is, a process of testing the correlation between the particle size of the ballas, the amount of compaction, the setting and hardening time, and the like. I found two new matters. (A) Even if the slag ball is pulverized and made into a fine powder having an average particle size of about 20 to 80 μm, the slag fine particles still have a large number of fine pores. Slag ballast itself does not lose its air permeability and water permeability, and as a result, the roadbed, which is an aggregate of the slag ballast, Do not lose ventilation and water permeability. (B) Filling the fine slag particles into the pores of the slag ballast having a large particle diameter requires less compaction and hardens the setting and hardening.

The present invention was created based on the above-mentioned knowledge, and is directed to a method for continuously improving a track base of a railway in operation at intervals of a fixed section at a certain interval. removed over a part of the subgrade soil to a certain depth, or
In addition, a sieve mesh 30 mm x 30 that has been sufficiently stirred and mixed in advance
mm 100% and sieve 80 μm × 80 μm
Slag ballast containing 20 to 30% by weight of fine particles passing through
Water treatment to remove the soil in the soft part
The water content is reduced to 8 to 1 by
A slag ballast of 5% by weight is laid, and thereafter the slag ballast layer is rolled by an impact force of a rammer or the like to extrude moisture from the inside of the slag ballast, and the slag ballast layer is condensed from the inside by a hydration reaction. When the slag ballast layer is condensed to the compressive strength of the slag ballast layer, a ballast ballast or a rigid block or the like is laid directly above the slag ballast layer or through an elastic sheet material, and the weight of the traveling vehicle causes The basic concept of the invention is to completely compress and harden the slag ballast, which has been condensed and reduced in a short period of time, by compressing and compressing the slag ballast through a ballast bed layer or a rigid block. Configuration.

[0014]

The slag ballast containing 20 to 30% by weight of fine particle components is sufficiently stirred and mixed in advance. As a result, the slag fine particles are filled into the pores of the slag ballast having a large particle diameter, and the corners of the slag ballast having a large particle diameter are removed, and the slag ballast becomes round. Sufficient water is applied to the stirred and mixed slag ballast. The slag ballast is left in a state of being immersed in water for about 4 to 8 hours, and then drained 2 to 3 hours before laying. As a result, water is contained in the fine pores in the slag ballast, and the water content of the slag ballast (W ₁ / W ₁ + W ₂ · 10
0) amounts to about 8 to 15% by weight. Here, W ₁ is ore
Weight of slag ballast, W ₂ is contained in slag ballast
The weight of water.

Slag laid by a rammer or the like to a predetermined thickness
When an impact compressive force is applied to the baluns layer and crushing by so-called compaction is performed, a hydration reaction occurs due to the water stored in the pores of the slag, and the slag ballast starts to coagulate. In this case, a large amount of fine slag particles are filled in the pores of the fine slag ballast at the time of stirring and mixing, and these fine slag particles are extruded together with water by a compaction pressure, and the size of the fine slag particles is reduced. It fills the voids between the large slag ballas. As a result, the hydration reaction proceeds more rapidly and the setting and hardening rate increases as compared with the conventional method using a particle size adjusting slag having a small content of fine particles.

Further, since each fine slag particle has a large number of fine pores, the content of the fine particle in the slag is 15 to 30% by weight.
Even if it is high, most of the holes in the roadbed will not be blocked and the soundproofing property and cushioning performance will not be reduced at all. Conversely, if the roadbed density rises to an appropriate value, vibration damping etc. Is more improved.

Furthermore, by interposed directly or sheet material vibration load by the vehicle weight by the running of the vehicle through the track bed ballast layer like transmitted to the slag ballast layer, slag rose over time
The compression of the layer is performed. As a result, the slag ballast layer is very efficiently and evenly compressed by the vehicle weight, whereby the setting and hardening continue to be promoted and after 3 to 4 months 1
A strong bell-shaped slag base having a compressive strength of 00 to 120 kg / cm ² is formed.

In addition, rainwater or the like infiltrates into the inside through fine pores of the slag roadbed, whereby the hardening due to the hydration reaction continues for a long time, and even if a crack is generated in the slag roadbed, The hydration reaction causes natural repair of the crack. In addition, the fine pores of the slag roadbed are of a size that can prevent the flow of mud particles, and the so-called orbital mud blowing phenomenon is completely eliminated in combination with the natural repair action of the cracks.

[0019]

1 is a longitudinal sectional view of a railway track embodying the present invention. In FIG. 1, 1 is a roadbed ( roadbed soil ), 2 is a slag layer, 3 is an elastic sheet, and 4 is a ballast ballast. 5 is a PC sleeper and 6 is a rail. In order to improve the soft roadbed portion (for example, a railroad crossing portion) of the conventional railway track according to the present invention, first remove the upper layer of the ballast of the soft roadbed portion, loosen the crossties between them, and push them toward one side. Or temporarily remove it. Next, the pavement ballast under the sleeper and the pavement soil of the subgrade immediately under the sleeper are removed over a depth of about 200 to 250 mm. Before commencement of the improvement work,
The prepared slag ballast is sufficiently stirred with a stirrer or the like in advance, and water is added to the slag ballast so that the ball is immersed in water for 3 to 8 hours.

When the plowing of the roadbed is completed, water is added to a degree of water soaking, and then the adjusted slag ball, which has been drained two to three hours before, is laid on the plowing part of the roadbed to a thickness of 20 to 30 cm. . As the adjusted slag ballas, 30 mm × 30
100% passing through 100 mm sieve and 80 μm × 80 μm
The slag ballast containing 20 to 30% by weight of fine particles capable of passing through a sieve having a diameter of 0.2 m is best.
80 μm × 80 separately formed on 85% by weight of the particle size adjusted slag which passed the aggregate sieving test specified in 1102
Slag fine particles 15 having a particle size that passes 100% through a sieve of μm
A slag ballas mixed with weight percent is used. Sprinkling is almost unnecessary at the time of laying, and the water content of the slag ballast is maintained at about 10 to 15% by the water absorbed during the addition of water.

The maximum particle size of the slag ballas is determined by a sieve 30.
In order to control the particle size so that 100% of the slag ballas passes through, it is difficult to compact the slag ballast if a ballast having a maximum particle size larger than this is mixed. This is because a partial variation occurs in the progress rate of the reaction.

Further, a sieve 80 μm is provided in the slag ballast.
The reason for containing 20 to 30% by weight of fine particles passing 100% through m × 80 μm is to minimize the compaction time at the content of the fine particles of 20 to 30% by weight and to make the minimum necessary by hydration reaction. Compressive strength (20-30kg / c
m ² ) can be obtained quickly, and the best results can be obtained in terms of vibration isolation performance and cushioning properties. If the content of the fine particles is less than 20%, the time required for obtaining the minimum necessary compressive strength (20 to 30 kg / cm ² ) is extended. In addition, the slag ballast cost rises as well as the slag and cushioning properties are reduced, and the economy is lacking.

When the laying of the slag ballas is completed, the surface layer is ground two or three times with a rammer or the like. The rammer used was an oil automatic lubrication type with a weight of 80.
１００100 kg and a frequency of about 550 to 600 times / minute are optimal. Since the slag ballast is porous, it is compacted by compaction by a rammer and the slag ballast layer 2 having a laying thickness of 30 cm is crushed to a thickness of about 25 cm by 3 to 4 compactions. Also, after about 2 hours have passed since the completion of the hardening, it is set to a level having a compressive strength of 20 to 30 kg / cm ² . When the compaction of the surface layer portion of the slag ballas is completed, directly or on the elastic material sheet 3 (for example, an SBR synthetic rubber sheet having a 25 mm-thick water hole) thereon
After laying, the ballast ballast 4 is laid about 250 mm in thickness.

Further, when the spread of the ballast 4 is completed, the sleeper 5 is finally pulled back to a predetermined position, and this is tightened and fixed to the rail 6, and then the ballast 4 is further spread and the ballast 4 is polished. Perform consolidation. The slag as described above is sequentially repeated every night with a section of 10 to 30 m in length as a unit, and a trackbed of a predetermined length is repaired.

The slag ballast layer 2 that forms the roadbed has not yet fully and completely undergone the hardening due to the so-called hydration reaction immediately after the laying and compaction, but the ballast ballast layer 2 is formed by the passage of the vehicle. 4 below the slag ballast layer 2
Are compressed and rolled on average over a long period of time, and are successively hardened while receiving the compressive force. That is, when the vehicle travels on the rails 6, the weight of the vehicle is transmitted to the slag ballast layer 2 via the ballast ballast layer 4, and the slag ballast layer 2 is compressed and compacted by vibrations above and below the ballast ballast layer 4. Will be done. On the other hand, in the slag ballast layer 2 , an amount of water necessary for the hydration reaction is added in advance at the time of laying the slag, and the surface layer portion of the slag ballast layer 2 is crushed when the slag is laid. Therefore, evaporation of moisture is prevented. or,
Since the slag ballast layer 2 is appropriately added into the slag ballast layer 2 by rainwater or the like, the hardening of the slag ballast layer 2 continuously progresses from the inside thereof while receiving the compression rolling by the vehicle weight with the lapse of time, and 3 to 4 months Later, 100-120 kg / cm ²
An extremely strong slag base having a degree of compressive strength will be formed.

[0026]

According to the present invention, 100% of fine particles passing through a 30 mm × 30 mm sieve and sufficiently passing through a 80 μm × 80 μm sieve with sufficient stirring and mixing in advance are used.
The slag ballast having a water content of 8 to 15% by weight is used by subjecting a slag ballase containing from 0 to 30 % by weight to a water treatment. As a result, the corners of the ballast having a large particle diameter can be removed by stirring, and the density of the slag ballast layer after laying can be increased due to the large amount of fine particles, so that the compacting work efficiency can be significantly improved. In addition, since the amount of fine particles is large, the fine particles are sufficiently naturally filled into large pores having a large diameter during stirring and mixing, and the filled fine particles are extruded into gaps between the ballasts by receiving rolling pressure. It is. As a result, the hydration reaction after compaction proceeds uniformly over the entire inside of the slag ballast layer , and the time required for obtaining the minimum required compressive strength (20 to 30 kg / cm ² ) is greatly increased. The waiting time required for curing can be reduced by about 60 minutes as compared with the conventional method. Furthermore, a large amount of fine particles are sufficiently filled into the pores of the large ballast, and the fine particles themselves have a large number of fine pores. And the vibration isolation is increased. According to the result of the actual measurement test, it is about 3 times as compared with the conventional method.
The anti-vibration performance is improved by about 5 dB.

In addition, it goes without saying that the present invention also has the following effects as in the case of the conventional method.
Since the set-hardened slag ballast layer has appropriate flexibility, cracks do not occur due to vehicle vibration, etc., and even if a crack does occur, the hydration reaction is restarted by supplying rainwater. And the crack is repaired. As a result, there is no mud-blowing phenomenon like the conventional concrete roadbed. The slag roadbed has a large number of pores therein so that water can permeate.
However, it is impossible for mud particles to permeate through the pores, so that the bed soil does not become mud and squirt onto the orbit. Mining elastic sheet material
When laid on the slag ballast layer , while the vibration noise is significantly reduced, the sheet material acts as a separator,
The slag ballast layer and the ballast ballast layer do not move up and down as a unit but vibrate vertically as separate bodies. As a result, the ballast layer performs the same function as the indenter, and the ballstock layer is efficiently and uniformly compressed over a long period of time, so that a stronger ballstock bed is formed. INDUSTRIAL APPLICABILITY As described above, the present invention has an extremely high practical utility in improving the track base of a railway in operation within a short period of time, such as during midnight operation suspension.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a railway track embodying the present invention.

[Explanation of symbols]

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

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Minamino 2-8-30, Terada-cho, Tennoji-ku, Osaka-shi Japan Technology Construction Co., Ltd. (56) References JP-A-63-27601 (JP, A) (58) ) Field surveyed (Int. Cl. ⁶ , DB name) E01B 1/00 E01B 37/00

Claims (1)

(57) [Claims] 1. A method of continuously improving a track base of a railway in operation, which is continuously improved at intervals of a certain section, removing a subgrade soil of a soft part of the base over a certain depth,
In addition, a sieve mesh 30 mm x 3
100% pass through 0mm and sieve 80μm × 80μ
The slag ballast containing 20 to 30% by weight of fine particles passing through m is sufficiently hydrolyzed to remove the bed soil of the soft part.
On the removed roadbed, a water content of 8
A slag ballast of up to 15% by weight is laid, and thereafter the slag ballast layer is rolled by an impact force of a rammer or the like to extrude moisture from the inside of the slag ballast, and the slag ballast layer is condensed from the inside by a hydration reaction. When the slag ballast layer condenses to the minimum compressive strength, a ballast ballast or a rigid block is laid directly or above a sheet material made of an elastic material over the slag ballast layer, depending on the weight of the traveling vehicle. By pressurizing and compressing the slag ballast through the roadbed ballast layer or the rigid block or the like, the slag ballast layer, which has been condensed and reduced in a short time, is completely coagulated and hardened over a long period of time. To improve the roadbed for track.