JPH05239459A - Track bed material and method for constructing reinforced track bed - Google Patents

Abstract

PURPOSE:To provide the subject material and method which enable the formation of a track bed having sufficient water permeability and supporting strength by a simple work in a short time. CONSTITUTION:This material is prepd. by mixing main components comprising cement and either a water-granulated iron-blast-furnace slag or a coal fly ash with auxiliary components comprising aluminum oxide, silicon dioxide, calcium oxide, sulfur trioxide, magnesium oxide, and sodium ligninsulfonate. The material is spread uniformly to a desired thickness and water is sprayed on it. When the fly ash is used, the spread material is lightly pressed from the upper side if necessary. The auxiliary components quicken the setting of the cement, which bonds sharp edges of granules of the slag or fly ash to each other and converts the material into a continuous void-contg. solid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roadbed material and a reinforced roadbed construction method used to newly install various roadbeds such as railroads, water-permeable sidewalks and tennis courts or to improve various existing roadbeds.

[0002]

2. Description of the Related Art For example, a conventional roadbed of a railway is formed by compacting soil. And lay crushed stones on this roadbed,
Sleepers and rails are sequentially laid on this crushed stone.
On the other hand, in conventional permeable walkways and permeable tennis courts,
Crushed stones are laid and rolled, and water-permeable asphalt is laid on it.

[0003]

However, in the conventional railway roadbed as described above, there is a risk that it will be collapsed by a large amount of rainwater, and the pressure and vibration applied from the bed crushed stone when the train passes through. The pore water pressure in the lower subgrade soil increases due to the synergistic action of, and along with this, the subgrade becomes mud, and the mud enters the upper crushed stone by the pumping action due to vibration, and promotes the reduction of the bearing capacity of the crushed subgrade. .. Then, the bearing capacity is lost, and the upper crushed stones are embedded in the lower roadbed soil, causing the subsidence of the rail, which is dangerous for running the train.
For this reason, it is necessary to perform maintenance such as replenishing crushed stones and applying vibration and pressure, and such maintenance requires a lot of manpower and cost.

Further, as the speed of trains has increased in recent years, the train load on the roadbed increases, making it difficult to maintain the normal strength of the track structure when the above-mentioned soil is used for the lower roadbed. Is. Therefore, a method of replacing the roadbed with a replacement material such as sand or crushed stone has been attempted. However, in such a replacement method, since the existing sleepers and rails are replaced as they are, these sleepers and rails interfere with the rolling of the replacement material, and the replacement material cannot be sufficiently rolled. For this reason, the roadbed strength in the running direction of the train varies, which may cause danger in running the train, and the ride comfort of the train is also poor. Resolving this issue requires relatively frequent maintenance,
This maintenance, like the above, requires a lot of manpower and expense.
In addition, since maintenance work such as replacement and pressurization as described above takes a long time, it is insufficient only at night when the train is stopped, and there are cases where the train has to be canceled during the day, which is a problem. Becomes

On the other hand, in the conventional water-permeable sidewalks and water-permeable tennis courts as described above, since water-permeable asphalt is used in the upper part, careful rolling operation by a road roller is required. For this reason, especially on narrow sidewalks and in the corners of tennis courts, rolling compaction by road rollers becomes impossible, and a compaction machine such as a rammer must be used, resulting in insufficient compaction strength and destruction in a short time. To do. In addition, water-permeable asphalt has problems such as poor strength because crushed stones are connected by a small amount of asphalt emulsion and water permeability is obtained in the voids.

The present invention solves the above-mentioned conventional problems, and a new roadbed can be newly provided or replaced in a short time by a simple operation, thus saving labor and improving economy. In addition, it is possible to prevent time constraints and satisfy both water permeability and supporting strength. Therefore, especially in rainy conditions, safety can be improved. In addition, it is possible to achieve a good load distribution, and therefore, particularly when used in a railway roadbed, to reduce the vibration of the train to improve the ride comfort and It is intended to provide a reinforced roadbed construction method.

[0007]

Means for Solving the Problems The roadbed material of the present invention for achieving the above object comprises, as a main component, one of granulated slag and coal fly ash and cement, and aluminum oxide, silicon dioxide, calcium oxide, It is a mixture of sulfur trioxide, magnesium oxide and sodium lignin sulfonate.

In order to achieve the above-mentioned object, the permeable roadbed construction method of the present invention comprises one of granulated slag and coal fly ash and cement as a main component, and aluminum oxide, silicon dioxide, calcium oxide, sulfur trioxide. , Magnesium oxide and sodium lignin sulfonate are mixed to prepare a roadbed material, which is laid at a predetermined height, then sprinkled with water and continuously solidified with voids. In particular, when the roadbed material is made by mixing coal fly ash and cement as a main component and mixing aluminum oxide, silicon dioxide, calcium oxide, sulfur trioxide, magnesium oxide and sodium lignin sulfonate, this roadbed material is specified. It is preferable to spread the water evenly at the height of 1 and then lightly pressurize the upper part to form voids for continuous solidification. In each of the above-mentioned roadbed construction methods, the water-permeable roadbed material can be replaced with an existing roadbed for improvement.

As the above-mentioned roadbed material, cement is 5 to 30% and aluminum oxide is 0.005 to 0.7 by weight ratio with respect to either one of granulated slag and coal fly ash.
5%, silicon dioxide 0.06-4%, calcium oxide 0.
005-0.75%, sulfur trioxide 0.001-0.25
%, Magnesium oxide 0.001 to 0.25%, and sodium lignin sulfonate 0.1 to 0.7% are preferably mixed in such a mixing ratio. As the water granulation slag, iron ore slag is sprayed with pressurized water to be rapidly cooled and granulated into a sharp shape like crushed glass, and dried one having a size of 0.3 to 5 mm is used. As the cement, ordinary Portland cement, early strength Portland cement, super early strength Portland cement and the like can be used.

As described above, by sprinkling water on the roadbed material that has been newly laid or replaced with the existing roadbed and permeated, a liquid phase having a pH of 10 or more is rapidly produced, and hydration of the cement is achieved. A hydrate such as calcium silicate, which is a reaction, generates an embryo species which is a source of crosslinking between particles of granulated slag or coal fly ash, and produces a plate crystal, which rapidly grows. That is, when the setting reaction that loses the fluidity of the cement paste progresses and calcium ions are hydrated, a gel is grown from the particle surface of granulated slag or coal fly ash, and this gel is entangled in a complicated manner.
Connects between particles of granulated slag and coal fly ash.
The normal setting reaction of this cement becomes quick setting due to the reaction of aluminum oxide, silicon dioxide, and sulfur trioxide with the cement, and a solidified body can be formed in a short time without applying pressure. On the other hand, granulated slag and coal fly ash contain silicon dioxide, aluminum oxide and calcium oxide as main components and have a property of slowly solidifying when they contain water. However, since the setting reaction of cement is quick-setting as described above, the granulated slag and coal fly ash are not connected and solidified as they are, but between the sharp parts of the granulated slag and coal fly ash. Solidifies in a state of being connected by cement, and after sprinkling water, no pressure is applied or only the upper part is lightly pressed, so the above solidified body has many voids and solidifies in a stable continuous state. It is possible to obtain good supporting strength and water permeability.

Here, if the amount of cement is less than 5%, the strength of the solidified body that becomes the roadbed will be poor and the bearing capacity will be inadequate.
If it is more than 0.1%, the voids of the solidified product will be small, and not only the water permeability will be poor, but it will also be expensive. Aluminum oxide is 0.0
If it is less than 05%, the quick setting property of the cement cannot be exhibited, and if it is more than 0.75%, not only the quick setting property of the cement is deteriorated but also it becomes expensive. If the content of silicon dioxide is less than 0.06%, rapid growth of calcium silicate cannot be expected, and if it is more than 4%, the voids of the solidified body are reduced, and not only the water permeability is deteriorated but also it is expensive. When the content of calcium oxide is less than 0.005%, the strength of the solidified product is poor, and when it is more than 0.75%, further improvement in strength cannot be expected and it becomes expensive. When the content of sulfur trioxide is less than 0.001%, the quick-setting performance is lost, and when it is more than 0.25%, the solidified body is acidified so that the strength cannot be desired for a long period of time and it becomes expensive. If the content of magnesium oxide is less than 0.001%, the rapid hardening of the solidified product cannot be obtained, and if it is more than 0.25%, the rapid hardening is not further improved and it becomes expensive. If the content of sodium lignin sulfonate is less than 0.1%, the setting reaction of the cement will be too fast, which makes it difficult to spread it. If it is more than 0.7%, the setting reaction of the cement will be too slow and the short-term roadbed strength will be low. It is not obtained, and the setting time can be adjusted to an appropriate level by selecting it in the range of 0.1% to 0.7%.

[0012]

Therefore, according to the present invention, after being laid as a roadbed, it can be solidified in a short time by a simple operation of just spraying water, or spraying and lightly pressing only the upper part. In addition, this solidified product connects the particles of the granulated slag or coal fly ash so as to have more voids in the cement, and can satisfy both the water permeability and the supporting strength. Further, since the continuous solidified structure is obtained as described above, the load can be favorably dispersed.

[0013]

EXAMPLES Examples of the present invention will be described below. (Example 1) mixing ratio dry slag 1000 kg / m ³ early-strength Portland cement 100 kg / m ³ aluminum oxide 1.44 kg / m ³ silicon dioxide 8.4 kg / m ³ calcium oxide 1.44 kg / m ³ made sulfur trioxide 0.36 kg / m ³ MgO 0.36 kg / m ³ lignosulfonate sodium 6.0 kg / m ³ roadbed material samples 1-3 were mixed in the above mix ratio. Then, this roadbed material is laid and 230 l / m of water is fed from above.
³ was sprinkled, and a continuous solidified structure was obtained. Uniaxial compressive strength (unit: kgf / c) obtained in this way
The test results for m ² ) are shown in Table 1 below.

[0014]

[Table 1]

For example, the short-term required strength required for a Shinkansen roadbed is 0.6 to 1 kgf / cm ² , and the long-term stable required strength is 10 to 20 kgf / cm ^2. Therefore, as is clear from Table 1, According to the above-mentioned Example 1, even if the roadbed is replaced at night when the train operation on the Shinkansen is stopped, the short-term required strength can be substantially satisfied, and the long-term stable required strength thereafter is also sufficiently satisfied. I was able to. On the other hand, as a comparative example, a roadbed structure was obtained with the same mixing ratio as above except that the admixture comprising aluminum oxide, silicon dioxide, calcium oxide, sulfur trioxide, magnesium oxide and sodium lignin sulfonate was not used. In this comparative example, the average of uniaxial compressive strength for 3 hours, 1 day, and 7 days with a compaction rate of 0% is 0 kgf / cm ² (not solidified and cannot be tested), 0.45 kgf / cm ² , 2 It was 0.93 kgf / cm ² , and could not satisfy both the short-term roadbed strength required for Shinkansen roadbed and the long-term stability required strength.

In addition, as a result of conducting a water permeability test on the roadbed according to the above-mentioned Example 1 for 7 days, the average is 5.3 × 1.
It was 0 ^-2 / sec. On the other hand, as a result of conducting a water permeability test on the roadbed according to the above comparative example on the 7th day, the average value was 2.3 × 10 ⁻⁴ / sec. If the water permeability is 10 ⁻³ / sec or less, it is good. Therefore, according to Example 1 above,
It is clear that the water permeability can also be sufficiently satisfied. Also in the test, in Comparative Example, clogging occurred in 2 days, but in Example 1 described above, a good water permeable state could be maintained.

Therefore, according to the first embodiment of the present invention, after the roadbed is laid, it can be solidified in a short time by a simple operation of sprinkling water. Can be improved. In addition, this solidified body can connect the water granulated slag particles so that it has more voids in the cement, and can satisfy both the water permeability and the supporting strength. Can be planned. Further, since the continuous solidified body structure is provided as described above, the load can be favorably dispersed. Therefore, when the load is used for the railway roadbed, the vibration of the train can be reduced and the riding comfort can be improved.

[0018] (Example 2) blending ratio of coal fly ash 1000 kg / m ³ early-strength Portland cement 150 kg / m ³ aluminum oxide 1.44 kg / m ³ silicon dioxide 8.4 kg / m ³ calcium oxide 1.44 kg / m ³ made of sulfur trioxide 0.36 kg / m ³ MgO 0.36 kg / m ³ lignosulfonate sodium 6.0 kg / m ³ roadbed material samples 1-3 were mixed in the above mix ratio. Then, this roadbed material is laid and 180 l / m of water is fed from above.
³ was sprinkled with water and pressurized to a compaction rate of 20% to obtain a continuous solidified structure. The test results of the uniaxial compressive strength (kgf / cm ² ) thus obtained are shown in Table 2 below.

[0019]

[Table 2]

As is clear from Table 2, also in the second embodiment, the short-term strength can be sufficiently satisfied even if the roadbed is replaced at night while the train operation on the Shinkansen is stopped, and after that, The long-term stability required strength was also fully satisfied.

Further, as a result of conducting a water permeability test on the roadbed according to Example 2 on the 7th day of the age, the average is 4.6 × 1.
It was 0 ^-3 / sec. On the other hand, as a comparative example, a roadbed structure was obtained under the same conditions as above except that the admixture such as aluminum oxide was not used. As a result of conducting a water permeability test on the roadbed according to this comparative example for 7 days, the average is 3.8 × 1.
It was 0 ⁻⁴ / sec. Water permeability is 10 ^-3 / sec as above
It is clear that the following conditions are good, and therefore, according to the above-mentioned Example 2, it is clear that the water permeability can be sufficiently satisfied.

Therefore, according to the second embodiment of the present invention, after being laid as a roadbed, it can be solidified in a short time as in the first embodiment by a simple operation of sprinkling water and lightly pressing only the upper portion. Therefore, the roadbed of the Shinkansen, which is subject to time constraints, can be improved without any problems. In addition, since this solidified product is connected between coal fly ash particles so as to have more voids in the cement and can satisfy both water permeability and supporting strength, it is particularly safe even under conditions with a lot of rainwater. Can be planned. Furthermore, since it has a continuous solidified body structure as described above, it is possible to satisfactorily disperse the load. Therefore, by using it for a railway roadbed,
It is possible to reduce train vibration and improve riding comfort.

In the second embodiment, the roadbed material is laid evenly and sprinkled with water, and then pressure is applied so that the compaction rate is 20%. However, when the roadbed support strength may be slightly inferior. It is also possible to simply sprinkle water without applying pressure. Also in the first embodiment, the roadbed material may be laid down and sprinkled with water, and then the upper portion may be lightly pressed. In the present invention,
In this way, the construction method is selected, and the cement is mixed in a weight ratio of 5 with respect to the granulated slag or the coal fly ash.
-30%, aluminum oxide 0.005-0.75%,
Silicon dioxide 0.06-4%, calcium oxide 0.0
05-0.75%, sulfur trioxide 0.001-0.25
%, Magnesium oxide 0.001 to 0.25%, and sodium ligninsulfonate in the range of 0.1 to 0.7%, it is possible to form a roadbed suitable for its strength. ..

[0024]

In summary, according to the present invention, after laid as a roadbed, it can be solidified in a short time by a simple work of just spraying water, or spraying and lightly pressing only the upper part. Therefore, it is possible to save labor, improve economy, and the like, and avoid time restrictions. In addition, this solidified product connects the particles of the granulated slag or coal fly ash so as to have more voids in the cement, and can satisfy both the water permeability and the supporting strength. Therefore, in particular, safety can be achieved even under a heavy rainfall condition. Further, since the continuous solidified structure is obtained as described above, the load can be favorably dispersed. Therefore, particularly when it is used for a railway roadbed, it is possible to reduce the vibration of the train and improve the riding comfort.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takutaro Hanawa 1-1-9-401 Oizumi Gakuen, Nerima-ku, Tokyo (72) Inventor Masayuki Katahira 4-20-10 Toro, Shizuoka City, Shizuoka Prefecture (72) Inventor Miyoshi Hirai 2-10-1 Nakata, Shizuoka City, Shizuoka Prefecture (72) Inventor Nobuaki Rooki 1-4-54 Bunkyocho, Mishima City, Shizuoka Prefecture

Claims (10)

[Claims] 1. A roadbed material which is mainly composed of granulated slag and cement, and is mixed with aluminum oxide, silicon dioxide, calcium oxide, sulfur trioxide, magnesium oxide and sodium lignin sulfonate. 2. A roadbed material which is mainly composed of coal fly ash and cement, and is mixed with aluminum oxide, silicon dioxide, calcium oxide, sulfur trioxide, magnesium oxide and sodium ligninsulfonate. 3. Cement 5 in weight ratio to granulated slag
~ 30%, aluminum oxide 0.005-0.75%, silicon dioxide 0.06-4%, calcium oxide 0.005-
The roadbed material according to claim 1, which is 0.75%, sulfur trioxide 0.001-0.25%, magnesium oxide 0.001-0.25%, and sodium ligninsulfonate 0.1-0.7%. 4. Cement 5-30% and aluminum oxide 0.005-0.7 by weight ratio to coal fly ash.
5%, silicon dioxide 0.06-4%, calcium oxide 0.
005-0.75%, sulfur trioxide 0.001-0.25
%, Magnesium oxide 0.001 to 0.25%, and sodium lignin sulfonate 0.1 to 0.7%. 5. A subbase material is prepared by mixing granulated slag and cement as a main component, and mixing aluminum oxide, silicon dioxide, calcium oxide, sulfur trioxide, magnesium oxide and sodium lignin sulfonate to prepare a subbase material. A reinforced roadbed construction method that is laid evenly on the height and then sprinkled with water to create a void and allow it to solidify continuously. 6. A base course material is made by mixing coal fly ash and cement as a main component, and mixing aluminum oxide, silicon dioxide, calcium oxide, sulfur trioxide, magnesium oxide and sodium lignin sulfonate to prepare a base course material. A reinforced roadbed construction method that is laid evenly on the height and then sprinkled with water to create a void and allow it to solidify continuously. 7. The reinforced roadbed construction method according to claim 6, wherein the roadbed material is laid at a predetermined height and sprinkled with water, and then the upper portion of the roadbed material is lightly pressed to form voids for continuous solidification. 8. The reinforced roadbed construction method according to claim 5, wherein the roadbed material is replaced with an existing roadbed for improvement. 9. Cement 5 in weight ratio to granulated slag.
~ 30%, aluminum oxide 0.005-0.75%, silicon dioxide 0.06-4%, calcium oxide 0.005-
0.75%, sulfur trioxide 0.001 to 0.25%, magnesium oxide 0.001 to 0.25%, sodium lignin sulfonate 0.1 to 0.7% and mixed to obtain a mixture ratio. The reinforced roadbed construction method according to claim 5 or 8, wherein a roadbed material is produced. 10. The weight ratio of coal fly ash to cement is 5 to 30%, and aluminum oxide is 0.005 to 0.005.
75%, silicon dioxide 0.06-4%, calcium oxide 0.005-0.75%, sulfur trioxide 0.001-0.25
%, Magnesium oxide 0.001 to 0.25%, and sodium lignin sulfonate 0.1 to 0.7% to prepare a roadbed material by mixing so as to have a mixing ratio of 0.1 to 0.7%. Construction method.