JP2014051407A - Road embankment composition for track, application method of road embankment for track and repair method of road embankment for track - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road embankment composition for a track, capable of adjusting viscosity appropriately without increasing an amount of water.SOLUTION: A road embankment composition for a track contains a hydraulic material, a mineral fine powder having Blaine value of 3000 cm/g or more and less than 5500 cm/g, a foaming agent and water, and a content of the mineral fine powder is 40 mass% or more and less than 100 mass% based on the hydraulic material.

Description

  TECHNICAL FIELD The present invention relates to a track embankment composition, a track embedding method using the track embankment composition, and a track embankment repair method.

A track such as a railway is usually installed on a roadbed made of concrete or the like installed on embankment.
The embankment is formed by compacting the soil or the like. However, it takes time for construction to compact the soil, and there is a problem that voids are likely to be generated in the embankment due to rainwater or spring water. In particular, in the case of a railroad track, if a gap is generated in the embankment as described above, the rail runs on the embankment, so that the void tends to increase, and the track installed on the surface may sink. Therefore, when such voids are generated, it is necessary to repair the embankment, but it has been difficult to repair by filling the soil in the voids.

Therefore, instead of using the soil that needs to be compacted in this way for the embankment, a cement composition containing cement as a hydraulic substance is used as the embankment composition.
For example, in Patent Document 1, a so-called air mortar (a foam cement composition) obtained by forming a foam with a foaming agent and water, and mixing the cement mortar with the foam is used as a banking composition. The use is described.
Such an air mortar is advantageous in that it does not need to be compacted, so that the construction time is short, and voids are less likely to occur compared to soil. Furthermore, since there is no need for compaction, there is an advantage that it can be easily used for repairing embankments where voids have occurred.

However, the air mortar described in Patent Document 1 includes a clay mineral powder having a brain value of 5500 cm ² / g or more in order to adjust the desired unit weight. Since the air mortar containing such a clay mineral having a brane value has a high viscosity, for example, even if an attempt is made to pump to a construction site using a filling hose or the like during construction, pumping becomes difficult and difficult to construct. Therefore, in order to facilitate construction, it is conceivable to reduce the viscosity by reducing the total amount of cement powder, which is a powder material, and clay-based mineral powder, and increasing the amount of water. When mortar is used as embankment, when the railway runs and a load is applied to the embankment, the embankment may become mud and cause mud ejected on the track.

Japanese Patent No. 3233695

  This invention makes it a subject to provide the embankment embankment composition which can be adjusted to a suitable viscosity, without increasing the quantity of water in view of the said problem. Moreover, it aims at providing the construction method of the embankment for an orbit which can construct an embankment composition easily, without increasing the quantity of water. Furthermore, it aims at providing the repair method of the embankment for an orbit which can repair an embankment easily by an embankment composition, without increasing the quantity of water.

  The inventors of the present invention have blended mineral fine powders having a specific range of brain values in a specific amount range so that an orbital embedding composition can be used in an appropriate viscosity range without adding water more than necessary. As a result, it was found that the adjustment can be easily performed, and the present invention has been completed.

Orbital for embankment composition of the present invention includes a hydraulic substance, and the mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and water,
The mineral fine powder is contained in an amount of 40% by mass or more and less than 100% by mass with respect to the hydraulic substance.

Track for embankment composition of the present invention includes a hydraulic substance, and the mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and water, wherein the mineral powder Is contained in an amount of 40% by mass or more and less than 100% by mass with respect to the hydraulic substance, so that it can be easily adjusted to an appropriate viscosity without adding more water than necessary when constructing as an embankment for a track. . Therefore, it can construct easily by means, such as pressure feeding, and can suppress that a banking composition turns into a mud after construction.

  In the present invention, the “mineral fine powder” refers to calcium carbonate, silicon dioxide, or a mineral powder containing these as main components, and examples thereof include a filler as silicon dioxide.

  In addition, the “hydraulic substance” in the present invention refers to a substance that reacts with water and exhibits curability, and includes a latent hydraulic substance.

According to the construction method invention trajectory for embankment comprises a hydraulic substance, and the mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and water, and the mineral The embankment forming step includes forming an embankment portion by constructing a embankment composition containing a fine powder in an amount of 40% by mass or more and less than 100% by mass with respect to the hydraulic substance at a place where the track is installed.

  This invention concerning the construction method of the embankment for a track | orbit may further include the sheet | seat installation process which installs a waterproof sheet so that at least one part of the upper surface of the said embankment part may be coat | covered.

  By installing the waterproof sheet so as to cover at least a part of the upper surface of the embankment portion, it is possible to prevent moisture from flowing into the embankment due to rainwater or the like. If moisture such as rainwater flows into the embankment after construction, the embankment composition will be easily mud, but by covering the top surface of the embankment with the waterproof sheet, it is possible to prevent rainwater from flowing into the embankment after construction. And it can suppress more that a banking composition becomes a mud.

According to the repairing method of the present invention the track for embankment comprises a hydraulic substance, and the mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and water, and the mineral The embedding composition containing 40% by mass or more and less than 100% by mass of the fine powder with respect to the hydraulic substance is filled in the voids generated in the embankment formed below the track to repair the embankment.

  ADVANTAGE OF THE INVENTION According to this invention, the embankment composition for track | orbits which can be adjusted to a suitable viscosity, without increasing the quantity of water can be provided. Moreover, the construction method of the embankment for an orbit which can construct an embankment composition easily, without increasing the quantity of water can be provided. Furthermore, the repair method of the embankment for a track | orbit which can repair an embankment with a embankment composition easily, without increasing the quantity of water can be provided.

A schematic sectional view showing embankment of one embodiment. The schematic sectional drawing which shows the embankment of other one Embodiment. The schematic sectional drawing which shows the embankment of other one Embodiment. The schematic sectional drawing which shows the state which the space | gap generate | occur | produced in the embankment part.

An embodiment of the present invention will be described.
First, an embodiment of the embankment embankment composition of the present invention will be described.
Orbital for embankment composition of this embodiment includes a hydraulic substance comprising a mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and water, wherein the mineral fine It is a composition containing 40 mass% or more and less than 100 mass% with respect to the said hydraulic substance.

The hydraulic substance is not particularly limited as long as it is a substance that is curable by reacting with water, and other substances that are cured by reacting with water such as cement and gypsum are mixed. In addition, a material having latent hydraulic properties that reacts with water under specific conditions and hardens such as blast furnace slag, fly ash, silica fume, and the like.
The hydraulic substance may be used alone or in combination of two or more.
As the hydraulic substance, a mixture of cement, blast furnace slag and gypsum is particularly preferable.

The cement is not particularly limited as long as it is a publicly known cement. Portland cements such as cement; mixed cements such as blast furnace cement, fly ash cement and silica cement; ultrafast cement, alumina cement and the like.
Among these, ordinary portland cement, early-strength cement, blast furnace cement, fly ash cement, and the like are preferable because the pot life can be easily adjusted and the cost is low. The cement may be used alone or in combination of two or more.

Examples of the blast furnace slag include granulated slag, slowly cooled slag, and the like.
Examples of the gypsum include semi-water gypsum, two-water gypsum, and anhydrous gypsum.

The mineral fine powder is a mineral fine powder, and examples thereof include fine powders of calcium carbonate, silicon dioxide, aluminum oxide, calcium oxide, potassium oxide, magnesium oxide, and the like. These fine powders may be used alone or in combination of two or more.
Among the mineral fine powders, calcium carbonate or silicon dioxide fine powders are preferable because they are difficult to separate when used as a banking composition.

The mineral fine powder, the Blaine value 3000 cm ² / g or more 5500cm less than ² / g, preferably at most 4000 cm ² / g or more 5300cm ² / g.
By being the range of the said brane value, when it is set as the embankment composition containing a bubble, it can adjust easily to the range of an appropriate viscosity, without mix | blending water more than necessary.
As a method for adjusting the fine mineral powder to the brane value, the mineral fine powder can be adjusted by pulverizing with a known pulverizing means until the target brane value is reached.
In addition, the brane value of the said mineral fine powder in this embodiment means the value measured by the method according to the physical test method of a JISR5201 cement, a fineness test, and a specific surface area test.

In the embankment embankment composition of this embodiment, the blending amount of the mineral fine powder is 40% by mass or more and less than 100% by mass, and preferably 55% by mass or more and 80% by mass or less with respect to the hydraulic material.
When the blending amount of the mineral fine powder is within the above range, when the embedding composition contains bubbles, it can be easily adjusted to an appropriate viscosity range without blending water more than necessary.

  The foaming agent is not particularly limited and includes conventionally known foaming agents such as protein foaming agents and surfactant foaming agents.

The foaming agent is a foamed cement composition such as air milk, air mortar, air concrete or the like by foaming in cement milk in which cement and water are mixed, or mortar milk in which aggregate is mixed, or concrete milk. Can be formed.
In the embankment composition of the present embodiment, as a method of containing bubbles by the foaming agent, the hydraulic substance, mineral fine powder, if necessary aggregate and other powder material, and water A slurry-like composition (slurry) is obtained by mixing, and the foaming agent is mixed with the slurry and stirred to obtain a banking composition containing bubbles, or the foaming agent and water in advance. Of a known foam cement composition, such as a method for obtaining a shaving cream-like foam by mixing the foam and mixing the foam uniformly and continuously with the slurry to obtain a banking composition containing bubbles. A method similar to the manufacturing method can be employed.

The water is blended as kneaded water for forming the slurry, or water for mixing with the foaming agent to form bubbles.
The amount of water contained in the embankment composition of the present embodiment is, for example, 40% by mass to 100% by mass, preferably 55% by mass to 80% by mass with respect to the total of the hydraulic substance and the mineral fine powder. Below.
Since the viscosity of the embankment composition can be adjusted to an appropriate range when the amount of water is in the above range, it is possible to suppress the occurrence of poor pumping during construction. And since the water | moisture content contained in a banking part can be made into the quantity of a suitable range, it can suppress that a banking composition becomes a mud.

The amount of the foaming agent in the embankment embedding composition of the present embodiment can be appropriately adjusted depending on the amount of air bubbles (air amount) included in the embankment embedding composition.
The amount of the bubbles is, for example, preferably about 300 liters to 600 liters, preferably about 400 liters to 550 liters per 1 m ^{3 of} the orbital embankment composition.
By setting the amount of bubbles in the above range, the strength as embankment can be improved after construction.

  The embankment composition of the present embodiment may be blended with powder components such as admixtures, liquid components such as water reducing agents, thickeners, and the like as necessary.

Next, an embodiment of a method for constructing an orbital embankment using the embankment composition will be described.
Method of constructing the track for embankment to the present embodiment includes the hydraulic substance, and the mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and water, and the mineral An orbital embankment comprising a embankment forming step in which an embankment composition containing 40 mass% or more and less than 100 mass% of a fine powder is applied to a place where an orbit is installed to form an embankment portion. It is a construction method.

  The place where the track is installed in the method of constructing the track embankment of the present embodiment is, for example, on the flat ground F as shown in FIG. 1 or on the slope S of the existing embankment 20 as shown in FIG. Examples include a surface BF between the existing embankment 20 and the abutment 30 on the adjacent ground F or a so-called abutment back as shown in FIG.

  When constructing the embankment composition, for example, when embankment is constructed on the ground F as shown in FIG. 1, the mold 11 is placed on the side of the embankment so that the embedding composition does not flow sideways. You may arrange | position in the position which hits. As a method of arranging the mold 11, for example, a plate-like body is prepared, the edge of one side of the plate-like body is inserted into the ground, the plate-like body is erected, and the embankment portion is formed You may arrange | position so that the side of may be enclosed.

  Furthermore, before constructing the embankment composition, the pile 12 that supports the roadbed may be driven into the ground. The pile 12 may be fixed with a tie rod 12a or the like.

In the present embodiment, the embankment composition is applied at a position surrounded by the mold 11 and the ground F to form the embankment portion 1.
The banking composition can be made into a banking composition containing bubbles by a known method as described above. At this time, since the embankment composition of the present embodiment has an appropriate viscosity, it is easy to mix the air bubbles and other components even when producing the aerated embankment composition in the field. In addition, mixing failure such as separation after mixing does not occur. Therefore, construction work on site can be easily performed.

The embankment composition can be constructed by pouring it into a construction site surrounded by the mold 11 and the ground F using a filling hose to which a pressure pump or the like is connected.
At this time, since the embankment composition of the present embodiment has an appropriate viscosity, poor pumping such as clogging in the filling hose does not occur even during pumping. Therefore, construction work can be easily performed.

  The track embankment construction method of this embodiment may further include a sheet installation step of installing the waterproof sheet 2 so as to cover at least a part of the upper surface of the embankment portion 1 formed in the embankment formation step. .

  The waterproof sheet 2 may be any waterproof sheet material made of synthetic resin, rubber, or the like. Among these, soft polyvinyl chloride and the like are preferable from the viewpoints of excellent waterproofness and easy construction.

The waterproof sheet 2 is preferably disposed on the surface of the embankment portion 1 after the embankment portion 1 is formed and before the hydraulic substance in the embankment composition is cured.
Or after the hydraulic substance of a banking composition hardens | cures and a banking composition solidifies, you may arrange | position on the banking part 1 surface via an adhesive agent.

For example, the waterproof sheet 2 may be disposed so as to cover the entire top surface of the embankment portion 1 as shown in FIG. You may arrange | position so that only a part may be coat | covered.
Furthermore, as shown in FIG. 2 or FIG. 3, the waterproof sheet 2 may be disposed on the top surface and a side part 1 a of the embankment portion 1.
In order to arrange the waterproof sheet 2 on the top surface and the lateral part 1a of the embankment portion 1 as shown in FIGS. 2 and 3, for example, prior to the embankment forming step, one end portion of the waterproof sheet 2 is It arrange | positions in the position which hits the side of the embankment part 1, implements a embankment formation process, forms the embankment part 1, and makes the sheet | seat body cover the prevention sheet 2 on the upper surface of the said embankment part 1 after that. You may implement the sheet | seat arrangement | positioning process to arrange | position.
When arrange | positioning the said waterproof sheet 2 to the part 1a of the side of the said embankment part 1, the said embankment part 1 from the upper surface of the embankment part 1 to the position of the depth of about 1.5m-2.0m, for example. It is preferable to arrange the waterproof sheet 2 so that the side of the cover is covered with the waterproof sheet 2.

When the said waterproof sheet 2 is arrange | positioned at the said embankment part 1 upper surface, it can suppress that rainwater etc. flow in into the embankment part 1 from the upper part of the embankment part 1, and a embankment composition turns into mud.
Moreover, when the said waterproof sheet 2 is arrange | positioned in the upper surface and part 1a of the side of the said embankment part 1, it suppresses that rainwater etc. flow in into the embankment part 1 from the upper surface edge part of the embankment part 1 especially. it can.

In the method for constructing a track embankment according to the present embodiment, a drainer 40 may be installed around the embankment portion 1. The drainage 40 is preferably installed at a position where water does not flow into the embankment 1 from the surroundings.
For example, as shown in FIG. 1, when the embankment portion 1 is formed on a flat ground F, it is preferable that a drainage 40 is disposed in the vicinity of the upper surface of the flat land on the side of the embankment portion 1. In this case, it is possible to prevent water from flowing into the embankment 1 from the side of the embankment 1 by allowing rainwater or the like on the surface to flow into the drainage 40.

  Moreover, as shown in FIG. 2, when forming the embankment part 1 in the position which touches the slope S of the existing embankment 20, arrange | position the sheet-like drainage material 50 on the slope S of the existing embankment 20, It is preferable to dispose the drainage 40 under the sheet-like drainage material 50. In this case, water is prevented from flowing into the embankment portion 1 from the existing embankment 20 side.

The track embankment construction method of this embodiment can be easily constructed without increasing the amount of water of the embankment composition to be constructed more than necessary.
Accordingly, as shown in FIGS. 1 to 3, the roadbed 101 and the track 102 are constructed on the upper surface of the constructed embankment portion 1, and a load is applied to the embankment portion 1 as a train passes on the track 102. However, there is an advantage that mud is not easily generated.
Furthermore, since it can construct without increasing the quantity of water more than necessary, the intensity | strength of the embankment part 1 after construction can be made high.

When the roadbed 101 is constructed on the upper surface of the embankment portion 1 constructed by the method for constructing a track embankment according to the present embodiment, the roadbed 101 is easily moved in the horizontal direction by arranging the waterproof sheet 2. Sometimes. In this case, a stopper may be inserted into the embankment 1, the waterproof sheet 2, and the roadbed 101 to prevent the roadbed 101 from moving in the horizontal direction.
For example, a pile 12 as shown in FIG. 1 may be used as the stopper. By inserting the upper end portion of the pile 12 into a through hole provided in the waterproof sheet 2 and fixing it to the lower surface side of the roadbed 101, the horizontal movement of the roadbed 101 can be suppressed. In this case, it is preferable that the periphery of the through hole of the waterproof sheet 2 is in close contact with the peripheral surface of the pile 12 with a caulking material or the like so that water does not leak from between the periphery of the pile 12. .

Next, the repair method of the embankment for track | orbits of this embodiment is demonstrated.
A method of repairing a trajectory for embankment to the present embodiment includes the hydraulic substance, and the mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and water, and the mineral Repair to repair the embankment part by filling a gap generated in the embankment part formed below the track with a embankment composition containing 40% by mass or more and less than 100% by mass of the fine powder to the hydraulic substance. Is the method.

As shown in FIG. 4, the embankment portion repaired in the present embodiment is an embankment portion 1 in which a gap 3 is generated inside the existing embankment portion 1.
In the embankment portion 1 formed on the lower side of the track 102, every time a railway travels on the track 102, a load is applied to the embankment portion 1 and a gap 3 may be generated. If the gap 3 is left unattended, it will cause sinking of the track 102 or the roadbed 101 installed on the embankment portion 1 and needs to be repaired.
Such repair needs to be performed without removing the track 102, the roadbed 101, and the like above the embankment 1.

In the repair method of the embankment for track according to the present embodiment, as in the construction method described above, using the filling hose to which a pressure pump or the like is connected, the tip of the filling hose is inserted into the gap 3 while the gap The embankment composition can be filled inside.
As a method for inserting the filling hose into the gap 3, for example, an opening 3a leading to the gap 3 is formed from the side 1b of the embankment 1 and the filling hose is inserted into the gap from the opening 3a. Is mentioned.

  Since the embankment composition of the present embodiment can be adjusted to an appropriate viscosity without blending water more than necessary as described above, the repair work can be easily performed without clogging the embedding composition in a filling hose or the like. Can be done.

  In addition, although this embodiment is as above, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

Examples of the present invention will be described below, but the present invention is not limited thereto.
An embankment composition was prepared with the composition shown in Table 1 using the following materials.

(material)
Hydraulic substance: A mixture of 56% by weight of ordinary Portland cement, 40% by weight of granulated slag, and 4% by weight of anhydrous gypsum.
Mineral fine powder: Calcium carbonate (Omi Mining Co., Ltd.)
Foaming agent: Sumishield AS1 (manufactured by Sumitomo Osaka Cement)

(Production method)
The calcium carbonate was pulverized using a pulverizer (device name: tabletop ball mill, manufactured by Seiwa Giken Co., Ltd.) so that the brain values shown in Table 1 were obtained.
When a hydraulic substance, mineral fine powder, and kneaded water are used as the embankment composition, a predetermined amount is weighed so as to have the ratio shown in Table 1, and the mineral fine powder and hydraulic substance are put into water, and a hand mixer (Ryobi) The mixture was stirred for 2 minutes at 1300 rpm with a power mixer PMT-1362A).
On the other hand, a dilution water is prepared by diluting the foaming agent with water in a ratio of 1 part by weight of the foaming agent and 24 parts by weight of water, and 0.5 MPa from the dilution water and the compressor (TFP22C-10 manufactured by Anest Iwata Co., Ltd.). Bubbles are obtained with a foaming gun (iron blown in a 1-inch iron pipe, beads, etc.) with the air discharged by pressure.
In the mixture of mineral fine powder, hydraulic substance, and water after stirring by the hand mixer, the foam is mixed so as to have the amount of bubbles shown in Table 1, and stirred for 30 seconds for each embankment composition. Got.

(Evaluation method)
About each Example and the comparative example, it measured as follows about air quantity, compressive strength, and workability.
<Bubble volume>
The total weight and volume of each embankment composition immediately after kneading were measured.
The density was determined from the total weight and volume, and the amount of bubbles was determined from the density and weight.

《Compressive strength》
The compressive strength was determined by measuring the compressive strength of each embankment composition at 28 days of age using a method in accordance with the soil compressive strength test method described in JIS A1216.
The results are shown in Table 1.

"performance test"
In the performance test, a flow value measured in accordance with the cylinder method described in JHS A 313-1992 “Testing method for air mortar and air milk” was measured, and those having a flow value of 120 mm or less were evaluated as being difficult to pump.
Moreover, the kneading | mixing state was observed visually.

As shown in Table 1, the embankment composition of each example could be kneaded well, did not cause material separation, and did not have a flow value that caused poor pumping. The compressive strength after 28 days was also good.
On the other hand, the embankment composition of each comparative example, when the brane value of the mineral fine powder in the embankment composition is 5500 cm ² / g or more, or when the amount of the mineral fine powder relative to the hydraulic substance is too large Was a flow value at which the viscosity of the embankment composition was too high and it was judged that kneading was impossible by visual observation, or it was difficult to pump.
On the other hand, when the brane value of the fine mineral powder of the embankment composition is less than 3000 cm ² / g, or the amount of the fine mineral powder relative to the hydraulic substance is too small, the embankment composition causes material separation. The banking composition could not be constructed.

<Effects of fine mineral powder>
Of the materials of Examples 6 to 5 and Comparative Examples 1 to 5, instead of calcium carbonate as a fine mineral powder, Sumiclay (main component: silicon dioxide, manufactured by Sumitomo Osaka Cement Co.) or filler N80 (mainly Each embankment composition shown in Tables 2 and 3 was prepared in the same manner except that the components: silicon dioxide (manufactured by Nippon Steel Mining Co., Ltd.) were used, and the same tests were performed.
The results are shown in Tables 2 and 3.

  As shown in Tables 2 and 3, even if the mineral fine powder is replaced, the embankment composition of each example can be kneaded well and can be easily constructed without material separation or poor pumping during construction. We were able to. The compressive strength after 28 days was also good.

1: embankment part, 2: waterproof sheet, 3: gap, 40: drainage, 101: roadbed, 102: track.

Claims (4)

Includes a hydraulic material, a mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and water,
An orbital embedding composition containing the mineral fine powder in an amount of 40% by mass or more and less than 100% by mass with respect to the hydraulic substance. A hydraulic material, a mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and a water and the mineral fine powders, with respect to the hydraulic material A method for constructing orbital embankment including an embankment forming step in which a embankment composition containing 40% by mass or more and less than 100% by mass is constructed at a location where the track is installed to form a embankment portion.   The construction method of the embankment for track | orbits of Claim 2 which further includes the sheet | seat installation process which installs a waterproof sheet so that at least one part of the upper surface of the said embankment part may be coat | covered. A hydraulic material, a mineral fine powder is less than Blaine value 3000 cm ² / g or more 5500cm ² / g, and foaming agent, and a water and the mineral fine powders, with respect to the hydraulic material The repair method of the embankment for a track | orbit which fills the space | gap which generate | occur | produced in the embankment part formed under the track | orbit with the embankment composition containing 40 mass% or more and less than 100 mass% and repairs the said embankment part.

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