JP2865413B2 - How to improve the track base for business lines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a method for improving a track base, and a soft base of a railway track in use during business operation is suspended for 3 to 4 hours at night or the like. Using road grade repair slag with specially adjusted grain size
The present invention is used in the case of continuous improvement of about 20 m at a time, and relates to a method of improving a roadbed which enables reduction of construction time and further reduction of noise and vibration.

(Prior Art) The applicant has previously developed a method of improving a trackbed for track use in service using grain size adjusting slag according to the JIS standard, which was disclosed in JP-A-62-55301 and JP-A-63-27601. It is released as each.

In other words, the method of improving the track bed is to repair the bed in a unit of construction of about 10 to 20 m in length during the suspension time of the train at night or the like, and (a) adjusting the particle size according to the standard of JIS A 1120. (2) After the slag ballast in a water-containing state is laid on the exposed floor to a predetermined thickness, the slag ballast is subjected to a predetermined time, and then the slag ballast is impacted 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. Over a long period of time by applying a weight of (100)
It forms a slag roadbed having a compressive strength of about kg / cm ² .

The method of improving a trackbed for track using the particle size adjusting slag,
It has many excellent practical effects such as relatively high soundproofing and vibration effects and effective prevention of the so-called muddy phenomena of the track at the crossing.

By the way, the reduction of the vibration and noise and the improvement of the cushioning performance are based on the fact that the slag ball itself constituting the roadbed is porous, and the slag layer has pores large enough to allow muddy water to pass but air and water to pass. It is described that a proper amount is dispersed inside the slag layer and that the aggregate formed by the hydration reaction of the slag layer is obtained by properties specific to the slag layer such as flexibility and cushioning property.

Therefore, in the conventional method using slag, the slag layer laid was compacted by compaction by using a slag having an extremely small particle size of slag fine particles as shown in Table 1 which conforms to the JIS A 1102 standard. At this time, the pores 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 enter the pores of the relatively large slag ballast and completely close the pores. As a result, the pore distribution in the fine slag layer is extremely reduced. This is because it is considered that the sound insulation effect and the cushioning performance are deteriorated with a decrease.

However, according to the actual test results, as shown in FIG. 2 and FIG. 3, even if the particle size adjusting slag having a small amount of the slag fine particles is used, the effect of reducing noise and vibration can be seen, but the value is about It is extremely small, about 5 dB, and has not yet reached a sufficient reduction effect.

In addition, FIGS. 2 and 3 show a thickness of 50 mm by the conventional method.
SBR on 0mm grain size slag roadbed (2 layers weight of 250mm roadbed)
A synthetic rubber sheet (thickness 25mm, with grooves and water holes, spring constant 7kg / cm / cm ² ) is laid, and a crushed stone ball 250mm is placed on it.
This is a measured value on a thickly laid railroad track, and the same conditions before and after the renovation at the side of the track (approximately 5m from the center of the track) approximately at the center of the Shisa's crossing section (approximately 50m in length) Measured below.

The measurement was conducted by Rion's NA-09 sound level meter and Rion's
This test was conducted using a UM-13A vibration level meter in accordance with the railway noise and vibration measurement guidelines set by the Japan Private Railway Association Technical Committee.

(Problems to be Solved by the Invention) The present invention has the above-mentioned problems in the conventional method of improving a trackbed using a particle size-adjusted slag, that is, the effect of reducing vibration and noise is extremely small. It is intended to solve the problem that sufficient soundproofing and anti-vibration effects cannot be obtained.
It is an object of the present invention to provide a method of improving a trackbed which enables formation of a roadbed having excellent soundproofing and vibration-proofing properties.

(Means for Solving the Problems) Therefore, when forming the roadbed using the slag ballast,
If the particle size of the slag used is increased and the fine particle component is increased, the bulk of the slag layer after the laying is reduced and the compaction can be performed relatively easily, and the setting hardening due to the hydration reaction of the slag ballast is accelerated. Is assumed.

However, as described above, when a slag ballast containing a large amount of fine particle components is used, all pores of the slag ballast are closed by fine powder, which not only deteriorates soundproofing performance and cushioning performance, but also reduces water permeability. It has heretofore generally been considered that the long-term setting hardening effect is stopped by the decrease. 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 inventor of the present invention crushed the slag ballast to make the particle size considerably fine, for example, even in the form of fine powder having an average particle size of about 10 to 80 μm, each of the slag fine particles still contains water and air. It has been found that a large number of micropores having a size small enough to pass through but not muddy water are retained, and that the solidified body itself has sufficient water permeability and cushioning properties.

That is, since a large number of the micropores are left in each of the fine particles of the slag, even if the amount of the fine particles of the slag increases and fills the pores of the large slag ballast, It has been found that the slag ballast itself does not lose air permeability and water permeability, and as a result, the roadbed, which is a condensate of the slag ballast, does not lose air permeability, water permeability or cushioning properties.

The present invention was created based on the above-mentioned knowledge, and in a method for continuously improving a track base for a railway in operation at intervals of a fixed section at a time, a method for improving a road at a weak portion of the base. Remove the bed soil over a certain depth, and place a 30 mm x 30 mm mesh with sufficient stirring and mixing in advance on the subgrade soil.
A slag ball containing 15 to 30% by weight of fine particles that pass 100% and pass through a sieve mesh of 80 μm × 80 μm is laid while sprinkling water, and the laid slag ball is compacted by the impact force of a rammer or the like to cause a hydration reaction. After setting and setting and hardening to the minimum required compressive strength, a rigid block such as a ballast or a railroad crossing is provided directly above the rolled slag ballast layer or through an elastic sheet material. The slag layer, which has been condensed and reduced in a short time by compressing the slag layer through the ballast layer or the rigid block or the like according to the weight of the traveling vehicle, for a longer period of time. Complete coagulation is the basic configuration of the invention.

(Action) The slag ballast containing 15 to 30% by weight of fine particle components is
Mix well beforehand. 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.

The slag ballast is laid while sprinkling water, whereby a predetermined amount of water is retained in each slag ballast.

When an impact compressive force is applied to the slag layer laid to a predetermined thickness by a rammer or the like and crushing by so-called compaction is performed, a hydration reaction by water occurs inside the slag and hardens like concrete. Without this, the slag ballas solidifies.

In this case, a large number of fine particles exist between the slag ballasts having a large particle size, and a large amount of the slag fine particles are filled into the pores having a large diameter during stirring and mixing. The contact area is increased, and as a result, the hydration reaction proceeds more rapidly and the solidification rate is increased as compared with the conventional method using a particle size adjusting slag having a small amount of fine particles.

As described above, each of the slag particles forming the roadbed after coagulation has a large number of micropores, and as a result, even if the content of the fine particles is increased to 15 to 30% by weight, Most of the holes in the roadbed will not be blocked, and the soundproofing, vibration-proofing, cushioning, etc. will not be reduced, and the vibration-proofing and cushioning will be improved by increasing the roadbed density to an appropriate value. The performance is further improved.

In addition, the vibration load due to the weight of the vehicle is transmitted to the slag layer through a ballast layer or the like directly or through a sheet material as the vehicle travels, 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, whereby the setting and hardening continue to be promoted and after 3 to 4 months a strong bell-shaped slag base having a compressive strength of 100 to 120 kg / cm ^2. Is formed.

Furthermore, rainwater or the like infiltrates into the inside through the fine pores of the slag roadbed, whereby the setting and hardening due to the hydration reaction continue for a long time, and even if a crack is generated in the slag roadbed, The reaction causes the natural repair of the crack.

In addition, the fine pores of the slag roadbed are of a size (average cross-sectional diameter of about 1 μm) so as to prevent the flow of mud particles by the compaction of the slag fine particles, and the so-called orbit is combined with the natural repair action of the cracks. No mud-blowing phenomenon.

(Embodiment) FIG. 1 is a longitudinal sectional view of a railway track embodying the present invention, in which 6 is a roadbed (exposed soil), 7 is a slag ballast,
8 is a ballast ballast, 9 is a rigid railroad crossing such as a track block, 10 is
PC sleepers, 11 is a rail.

Referring to FIG. 1, in the case of improving a soft roadbed portion (for example, a railroad crossing portion) of a railroad track according to the present invention, first, an upper layer portion of a ballast ballast 8 of a soft roadbed portion is removed, and a sleeper 10 therebetween. Loosen and push to one side, or remove temporarily. Next, the pavement ballast 8 under the sleeper 10 and the roadbed immediately below it are removed from the plow over a depth of about 200 to 250 mm.

When the plowing of the roadbed is completed, the adjusted slag ballast 7 sufficiently stirred and mixed using a yumbo, a stirrer or the like in advance is laid on the plowing portion of the roadbed to a thickness of 20 to 25 cm while sprinkling water. .

As the adjusted slag ball 7, a slag ball containing 15 to 30% by weight of fine particles that can pass 100% through a 30 mm × 30 mm sieve and pass through a 80 μm × 80 μm sieve is the best. A slag ballast is used in which 85% by weight of slag that has passed the aggregate sieving test specified in JIS A 1102 and 15% by weight of slag fine particles having a particle size of 100% passing through a separately formed 80 μm × 80 μm sieve are used. ing.

Watering is performed as uniformly as possible, and the water content of the slag ballast 7 is maintained at about 7 to 15%.

The maximum particle size of the slag ball 7 is 30 mm x 30 mm.
Controlling the particle size so that it passes through 100% means that if a ballast with a maximum particle size larger than this is mixed, it becomes difficult to compact the slag ballast and it takes more trouble, and the water hardening reaction of the slag ballast proceeds. This is because there is a partial variation in speed.

In addition, a sieve mesh of 80 μm × 80 μm
15 to 30% by weight of fine particles that pass 100% of the pressure can minimize the compaction time at the content of the fine particles of 15 to 30% by weight and the minimum compressive strength required by the water curing reaction. (10-20 kg / cm ² ) can be obtained quickly, and the best results can be obtained in terms of soundproofing, vibration proofing and cushioning.

If the content of the fine particles is less than 20%, the time required for obtaining the minimum required compressive strength (10 to 20 kg / cm ² ) is extended, and if the content of the fine particles exceeds 30%, the sound insulation is reduced. The properties and cushioning properties are reduced, and the cost of slag bals rises, resulting in lack of economy.

When the laying of the slag ballas 7 is completed, the surface layer is polished 2-3 times with a rammer or the like. Since the slag ballast 7 is porous, it is compacted by compaction by a rammer, and the slag ballast layer having a thickness of 20 cm laid by three compactions is approximately 16 cm.
Polished to the thickness of

Also, after about 2 to 3 hours have passed since the completion of grinding,
Coagulates to have a compressive strength of 2020 kg / cm ² .

When the compaction of the surface layer of the slag ballas is completed, directly or after laying an elastic sheet (for example, an SBR-based synthetic rubber sheet having a 25-mm-thick water-permeable hole), the ballast ballast 8 is 250 mm thick. Laying about.

When the floor 1 of the ballast ballas 8 is finished, the sleepers 10
Is returned to a predetermined position, and it is tightened and fixed to the rail 11. After that, the ballast ballast 8 is spread and the ballast ballast 8 is polished.

The above-mentioned process is repeated every night with a section of 10 to 30 m in length as a unit, and the trackbed of a predetermined length is repaired.

The slag ballast 7 that forms the roadbed has not yet sufficiently and completely caused the hardening by the so-called hydration reaction immediately after the laying and compaction, but the passage of the vehicle causes the ballast ballast 7 to pass through the ballast ballast 8. Thus, the lower slag layer 7 is compressed and rolled on average over a long period of time, and is successively hardened while receiving the compressive force.

That is, when the vehicle travels on the rail 11, the weight of the vehicle is transmitted to the slag layer 7 via the ballast 8 and the slag layer 7 is compressed and compacted by the vibration of the ballast layer 8 up and down. become.

(Effect of the Invention) In the present invention, a sieve 30 which is sufficiently stirred and mixed in advance is used.
100% passing through mm × 30mm and sieve 80μm × 80μ
using a slag ballast containing 15-30% by weight of fine particles that pass 100% through the m, and laying the slag ballast while watering the slag ballast so that the water content is maintained at about 7-15%. I have.

As a result, the present invention does not require a separate water-containing step for the slag ballas in the conventional method, so that it is possible to greatly reduce the number of steps required for the process and to transport and lay the ballast. Also becomes easier.

In addition, since the corners of the ballast having a large particle diameter can be removed by stirring and the amount of fine particles is large, the density of the slag layer after laying naturally increases, and the conventional method requires about three compactions. It is possible to perform the same degree of hardening with multiple compactions,
The rolling work efficiency can be greatly improved.

Further, since the amount of the fine particles is large, the fine particles are sufficiently naturally filled into the pores of the ballast having a large particle diameter, and the curing by the hydration reaction at the time of adding water is performed more efficiently. As a result, the time required to obtain the required minimum compressive strength (10 to 20 kg / cm ² ) is greatly reduced, and the waiting time required for curing is reduced by about 30 to 60 minutes compared to the conventional method. Can be done.

In addition, a large amount of fine particles are sufficiently filled into the pores of a ballast having a large particle diameter, and the fine particles themselves have sufficient fine pores, so that the density of the roadbed formed by condensation is homogenized. And the value improves. As a result, the soundproofing, vibration-proofing and cushioning properties are increased, and according to the results of actual measurement tests, a reduction of about 3 to 5 dB can be achieved as compared with the conventional method.

In addition, it goes without saying that the following effects are exerted similarly to the case of the conventional method.

Since the set-hardened slag layer 7 has appropriate flexibility, no cracks are generated by vehicle vibrations and the like. Even if a crack is generated, the hydration reaction is restarted by supplying rainwater. , Cracks are repaired. As a result, there is no mud-blowing phenomenon like the conventional concrete roadbed.

The slag roadbed has a number of small holes inside it,
This allows water to permeate. However, mud particles cannot pass through the pores,
Dotachi clay is never muddy and erupted into orbit.

When the sheet material 12 having elasticity is laid on the slag layer 7, the vibration noise is greatly reduced, and the sheet material 12 acts as a separator, so that the slag layer 7 and the ballast ballast layer 8 are integrated. They do not move up and down and vibrate up and down separately. As a result, the ballast layer 8 performs the same function as the indenter, and the slag layer 7 is efficiently and uniformly compressed over a long period of time, so that a more robust roadbed 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. FIG. 2 and FIG. 3 show an example of the vibration-proof and sound-proof characteristics of a railway track on which a slag base is formed by a conventional method. 6 ... roadbed (roadbed soil) 7 ... slag layer 8 ... roadbed layer 9 ... track block 10 ... sleeper 11 ... rail 12 ... sheet material

Claims (1)

(57) [Claims] In a method for continuously improving a track base of a railway in operation during a certain section of operation during a downtime, a subgrade soil at a soft portion of the base is spread over a predetermined depth. Remove and pass 100% through a 30 mm x 30 mm sieve that has been thoroughly stirred and mixed in advance on the subgrade soil, and sieve 80 µm x 80 µ
The slag ball containing 15-30% by weight of fine particles passing through m is laid while sprinkling water, and the laid slag ball is rolled by an impact force of a rammer or the like to cause condensation by a hydration reaction, and the minimum necessary compression is performed. After setting and hardening to the strength, a rigid block of a ballast or a railroad crossing is laid directly above the rolled slag ballast layer or through a sheet material made of an elastic material, depending on the weight of the traveling vehicle. A business wherein the slag layer condensed and reduced in a short time is completely coagulated for a longer period of time by pressurizing and compressing the slag layer through the ballast ballast layer or the rigid block or the like. How to improve the track base for wire.