JP2648653B2 - Construction method of hardened cement bitumen grout for railway - 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 constructing a filler material for railroad tracks.

[0002]

2. Description of the Related Art A ballast ballast track requires a large amount of labor for its maintenance work such as tamping after laying, erratic correction, ballast replacement, labor shortage, aging of workers,
Various labor-saving trajectories have been realized to cope with problems such as rising wages, and various fillers have been used.

[0003] As a typical example, there are a pavement track and a filling track floor track in a labor saving track for a business line, and a filling material having performance suitable for each track structure is used. All of them are injected into the ballast within a short line closing time of a business line, and in order to quickly develop strength to withstand a train load, a hardened cement bitumen grout material (Japanese Patent No. 85489).
No. 4) etc. must be used.

Further, two methods are employed for the construction. One of the methods is a direct injection method in which, because the filling material is rapidly hard, a moving plant vehicle loaded with a mixing device is used, and all the materials are kneaded at once and immediately poured into a ballast at a construction site from an adjacent line. The other one is a pump pressure feeding system in which the filler is divided into liquid A and liquid B, kneaded and pumped separately, and both liquids are mixed by a power-stirred batch mixer at the tip and poured into a ballast. is there.

[0005]

In the injection of a hardened cement bituminous grout, the required load-bearing capacity must be obtained in a short period of time. ) Is used as short as possible. Therefore, in the direct pouring method, gelling is likely to occur when the kneaded grout is not completely discharged, which causes a problem of solidification in the mixer. In addition, the use of mobile plant vehicles requires the use of a depot base, which requires time to enter and exit from the base to the construction site, resulting in problems such as shortening the construction extension and reducing efficiency. is there.

On the other hand, in the pump pumping method, the grout material is separated into liquid A and liquid B and separately pumped. However, since both liquids have high fluidity, breathing (floating water) and material separation occur during pumping. Also, there is a problem that the variation in the short- and long-term strength is increased due to the variation in the amount of the hardened material, and the homogeneity is lacking. In addition, since the liquid A and the liquid B are mixed by the batch type mixer that rotates the stirring blade at the tip of the pressure feeding hose by power, the weight of the bogie, the mixer, and the mixed liquid and the vibration during kneading may cause the orbit to be out of order. There is a problem to cause. In addition, in the mixer,
Since the liquids A and B are not necessarily in the order of first-in, first-out, there is a problem that the quality of the hardened material varies due to the fluctuation of the mixing ratio of the two liquids and the grout material solidifies in the mixer due to the residual old liquid. .

Further, the liquid A and the liquid B usually remain in the pressure-feeding hose at the end of the pressure-feeding operation, and this residual material is treated as waste liquid by washing with water. In the case of long-distance pumping, the dilute waste liquid in the liquid A hose, the paste part of the cement bitumen part flows out first, and the sand often remains afterwards, often causing the hose to be clogged. Since the length is restricted to approximately 200 m or less, there is a problem that the construction extension from the pump installation location is shortened and the construction efficiency is reduced.

[0008]

SUMMARY OF THE INVENTION According to the present invention, when a rapid hardening cement bitumen grout material for railways is pumped and injected, fluidity is maintained for a certain period of time (to prevent gelation) so that long distance pumping can be performed. And a homogeneous cured product having the required short and long-term strength can be obtained.

That is, the grout material is separately kneaded into a liquid A of cement bitumen mortar and a liquid B of rapidly hardened material slurry. Solution A contains water, a setting regulator that delays the hydration reaction of cement, an antifoaming agent that breaks / miniaturizes entrapped bubbles, a bitumen emulsion that has good miscibility with cement, and a mixture with cement and bitumen emulsion. A high-molecular-weight emulsion, a cement for imparting strength, a fine aggregate contributing to economy, and a foaming agent for improving filling properties are used. On the other hand, as the liquid B, water, a setting regulator for delaying the hydration reaction of the rapid-hardening admixture, and a rapid-hardening admixture that improves the homogeneity of the slurry and develops high strength in a short time are used.

[0010] The above-mentioned solution A and solution B are kneaded by separate mixers, respectively, so that they do not gel for a certain period of time (60 minutes or more). By separately pumping each liquid, long-distance pumping can be performed without any material separation.
Therefore, the grout material can be supplied from the track of the filling work or from any place outside the track, so that the work can be performed not only in the double track section but also in the single track section. In addition, since the entry / exit work of the mixing plant vehicle can be omitted, the actual operation time of the injection work during the closing time of the track from the last train to the first train is extended.

[0011] Next, by mixing the two liquids A and B by a special continuous mixer of the handy type attached to the tip of the pressure feeding hose, to continuously produce a homogeneous rapid hardening cement bitumen grout material. Can be. Further, since the mixed grout material has a fluidity that can be injected into the ballast for about 10 seconds to 30 minutes after kneading, it can be completely filled in the ballast gap by an injection method under natural flow.

[0012] Since it cures very quickly after filling, it can form a packed layer that can withstand train loads in a short time, and can prevent track deviation. In addition, since the continuous mixer is lightweight and compact, it can be easily transported by hand, and the efficiency of construction can be significantly improved due to effects such as continuous injection work. Further, a water pumping system is provided in addition to the pumping system for the A liquid and the B liquid. This is a facility for cleaning the remaining material in the hose of each of the liquids A and B, which is an indispensable step at the end of the pouring operation. With this water system, the remaining material in the liquid A hose is divided and washed sequentially about every 200 m from the pump side (mixer side), and the residual material in the liquid B hose is washed once or dividedly. Wastewater treatment can be performed without any trouble even in a long distance. In addition, in this divided washing method, by increasing the number of divisions described above, the conventional pumping limit was significantly increased, and long-distance pumping work became possible.

In cleaning the residual material in the hose of the liquid A, a thixotropic suspension in which bentonite or another clay mineral is dissolved in an appropriate amount of water is used instead of water, so that the wastewater in the waste liquid is removed. The sedimented substance such as sand can be easily washed away, and cleaning can be performed without any trouble. Also,
The grout material of the present invention and the method of construction thereof, even when the required quality varies depending on the type of labor saving track, by changing the mixing ratio of each material constituting each of the liquids A and B or by changing the amount of pumping of each liquid, It becomes a rapidly hardened cement bitumen grout material suitable for both tracks.

This will be described in more detail below. The quick-hardening cement bitumen grout material of the present invention comprises a specific cement, a quick-hardening admixture, a bitumen emulsion, a polymer emulsion, a fine aggregate, a setting regulator, an antifoaming agent, a foaming agent, and water. As the cement, Portland cement, fly ash cement, blast furnace cement, silica cement, sulfate-resistant cement, moderate heat cement, jet cement, alumina cement, etc. can be used, and especially the hydration reactivity with the rapid hardening admixture is excellent. Portland cement is preferred. This forms the skeleton of the grout hardened body and mainly contributes to securing strength.

As the rapidly hardening admixture, use is made of a mixture of a calcium aluminate mineral and calcium sulfate (gypsum) mixed with an inorganic fine powder. The calcium aluminate-based mineral is obtained by melting CaO and Al ₂ O ₃ by an electric furnace or the like, and the CaO content is 20 to 70% by weight, preferably 35 to 65% by weight. In addition,
If the content is less than 20% by weight, short-time strength is insufficient, and
If the amount is more than the weight percentage, it is difficult to control the setting time. Calcium aluminate minerals include SiO ₂ and MgO
And the like, and an amorphous material is preferable. Fineness 2000 cm ² / g or more in Blaine value in consideration of the strength development, preferably a 4000~8000cm ² / g, may be further pulverized. Gypsum has various forms, and any gypsum can be used. Of these, type II anhydrous gypsum is preferable. As for the ratio of the calcium aluminate-based mineral and gypsum, the latter is 0.1 to 10% by weight based on the former. Otherwise, short and long-term strength is poorly expressed.

The inorganic fine powder greatly contributes to the homogeneity and long-term strength stability of the rapidly hardened cement bitumen grout material, and the materials used are blast furnace slag, converter slag, and other auxiliary materials used in refining metals. One or more selected from raw slag, activated silica, fly ash, pozzolans such as volcanic ash, pseudo-limestone and silicate clay, siliceous powder, calcined clay, limestone, diatomaceous earth, bentonite and the like. Among them, blast furnace slag, activated silica, fly ash, calcined clay and pozzolan are preferable from the viewpoint of long-term durability. Further, the fineness is preferably 1 mm or less in maximum particle size and 500 to 2000 cm ² / g in Blaine value. Inorganic fine powder is calcium aluminate mineral and gypsum
The ratio of the former to the latter is 0.1 to 1 with respect to the latter.
0 parts by weight, preferably 0.3 to 5 parts by weight.

[0017] The rapid-hardening admixture obtained by mixing these components is usually used in an amount of 10 to 50% by weight, preferably 15 to 40% by weight, based on Portland cement. In addition, 10% by weight
If it is less than 50%, the rapid hardness becomes unsatisfactory, and if it exceeds 50% by weight, it is not economical. The quick-hardening admixture is blended with a setting regulator such as an alkali carbonate and an organic acid, and the slurry is used alone by adjusting so as not to gel for 60 minutes or more.

Bituminous emulsions include bituminous substances, for example, having a penetration of 4
The main material is straight asphalt of about 0/60 to 200/500, to which a surfactant and a polyvalent metal salt are added,
Further, it is emulsified in water by using an emulsifying aid, a dispersant, a protective colloid and the like as needed. In addition, a modified bitumen product obtained by adding and mixing a rubber, a synthetic high-molecular polymer, or the like to a bituminous product and emulsifying the modified bituminous product can be used.

The bitumen content in the above emulsion is 4
0-70% by weight, especially 55-65% by weight is preferred.
At this time, as the surfactant, anionic, cationic,
One or more nonionics are contained in the emulsion in an amount of 0.5 to 8% by weight, preferably 1 to 5% by weight. As the polyvalent metal salt, chlorides such as AlCl ₃ , FeCl ₃ , CaCl ₂ and MgCl ₂ are contained in an amount of 0.05 to 5% by weight, preferably 0.2 to 2.5% by weight as polyvalent metal ions. By using such a bituminous emulsion, there is an effect that the mixing property with cement and the workability are improved and the hydration rate is accelerated to increase the initial strength as compared with the conventional one.

Since the required performance of the bitumen emulsion varies depending on the type of orbit to be applied, it is preferable to change the compounding ratio with respect to the cement. % By weight, and in the case of a packed orbit, it is sufficient to add 50 to 150% by weight. At this time, a composition having a small amount of bituminous emulsion is a cured composition having a property of high strength but poor flexibility and elasticity, and a large amount of emulsion forms a cured composition opposite to the above. Depending on the increase / decrease, it is possible to select a cured product that meets the required performance.

As the polymer emulsion, rubber latex,
Synthetic polymer emulsions, synthetic resin emulsions, water-soluble polymer polymers, etc. can be used, especially SB which is excellent in mixing with cement, rapid-hardening admixture, bitumen emulsion, etc.
R-based latex is preferred. This is present in the grout hardened body and mainly serves to improve brittleness, temperature sensitivity and the like.

It is preferable that the mixing ratio of the SBR type latex to the cement is changed according to the required performance of the track. For example, in the case of a pavement track, 5 to 50% by weight based on the cement, and in the case of a packed track floor track. Has 10
It is sufficient to mix 60% by weight. As the fine aggregate, for example, river sand, sea sand, mountain sand, silica sand and the like can be used, and in particular, silica sand having a hard stone and a small water absorption is preferable. In addition, a filler such as glass powder, silica sand powder, silica earth, bentonite, clay, stone powder, fly ash and the like can be used together with the fine aggregate.

Examples of the setting regulator include inorganic salts and organic acids.
Use ZnCl for inorganic salts_Two, AlCl_Three , CaCl_Two , Mg
Cl_Two , FeCl_Two , FeCl_Three , NiCl_Two , MgBr_Two Inorganic halide
Chloride, Na_TwoSO_Four , K_TwoSO_Four , NaNO_Three , NaNO_Two , KNO
 _Three, KNO_Two, Ca (NO_Two)_Two , Ca (NO_Three)_Two, MgSO_Four, F
eSO_Four , Al_Two(SO_Four)_Three, CaB_FourO₇ , Na_TwoB_FourO₇ , N
a _TwoCO_Three , K_TwoCO_Three , NaHCO_Three , KHCO_ThreeSulphate, nitrate, etc.
Acid salts, nitrites, borates, carbonates and the like.
Used alone or in combination, but the content of carbonate is
You.

On the other hand, examples of the organic acid include gluconic acid, calcium gluconate, sodium gluconate, citric acid, calcium citrate, sodium citrate, tartaric acid and the like, and these are used alone or in combination. The above-mentioned setting regulator is used for the purpose of adjusting the workability of each of the liquids A and B of the grout material and the mixed liquid thereof, and it is particularly preferable to add an appropriate amount to each of the liquids A and B. In addition, the total amount of both liquids is 0.05 to 0.05% of inorganic salts with respect to cement.
10% by weight, organic acid and the like are 0.05 to 5% by weight. In other ranges, the setting cannot be adjusted and the workability cannot be ensured.

As the antifoaming agent, for example, besides silicone type antifoaming agents, alcohol type, fatty acid type, fatty acid ester type, amine type, amide type, ether type, metal soap and the like can be used. These antifoaming agents act to reduce unnecessary entrapment of bubbles when kneading the materials of the liquid A. Examples of the foaming agent include aluminum powder, magnesium powder, and zinc powder. Those treated with an organic acid such as stearic acid can also be used. The foaming agent foams in the presence of water and cement, increases the volume when the grout hardens, and functions to harden when the grout is completely filled.

As the water, fresh water is generally used. These include water from tap water, groundwater, river water, and industrial water. Water is used to adjust the mixing properties of the A and B liquids, the workability of the grout material formed by mixing the two liquids, and the filling properties. Fibers may be added in addition to the above materials. The fibers include glass fiber, inorganic fiber such as asbestos, cotton, hemp,
There are natural or artificial fibers such as wool, rayon, and human silk, synthetic fibers such as polyamide, vinylon, acrylic, polyester, polypropylene, and polyvinyl chloride, and carbon fibers. In particular, the thickness of the fiber is less than 100 denier and the length is 3
It is preferably cut to a size of up to 20 mm, and can be used alone or in combination. The addition of fibers has the effect of improving the bending strength, shear strength, impact resistance, etc. of the grout material.

Further, as a technique for obtaining the same effect,
Before the injection, a construction method in which a grout material is filled in a ballast in which a mesh cloth, woven cloth, or nonwoven cloth of the same kind as the above, such as inorganic fibers, synthetic fibers, and carbon fibers, is inserted directly under a PC sleeper or directly under a filling layer. . Generally, an alkali-resistant glass fiber mat is preferably used immediately below the PC sleeper, and a non-woven fabric made of polyethylene is preferably used immediately below the filling layer. Both are used to reinforce the filling layer to improve the load resistance and crack resistance. It has a remarkable effect.

[0028]

The hardened cement bitumen grout material of the present invention,
For example, for paving tracks, kneading, pumping and pouring are performed in the following manner. That is, the conventional direct injection method (one-liquid method)
The standard composition of the grout material is 0.75 parts by weight of ordinary Portland cement (hereinafter simply referred to as "parts"), 0.25 part of a rapid-hardening admixture, 1.15 parts of a bitumen emulsion, 0.2 part of a polymer emulsion.
5 parts, fine aggregate 1.0 part, water 0.3 part, setting regulator 0.0
15 parts, defoamer 0.001 part, aluminum powder 0.0
0003.

On the other hand, the pumping method of the present invention (two-liquid method)
In the case of the above, the standard composition of the above one-component method is as follows:
Separate and knead the solution separately. The standard composition of each liquid is as follows: Liquid A is 0.75 parts of ordinary Portland cement, 1.15 parts of bitumen emulsion, 0.25 parts of polymer emulsion, 1.0 part of fine aggregate, 0.3 parts of water, coagulation The mixing ratio of 0.011 part of the regulator, 0.001 part of the defoamer, and 0.00003 of aluminum powder was used. Liquid B was 0.25 parts of a rapid-hardening admixture, 0.004 parts of a setting modifier, and 0.27 parts of water. Parts.

The above-mentioned liquids A and B are kneaded by a mixer as shown in FIG. 1, and are pumped and injected by a pump. That is, A
The liquid is first mixed with water, an antifoaming agent and a setting modifier, then a bitumen emulsion is added, a polymer emulsion is added, then sand and aluminum powder are added at the end of ordinary cement, and the mixture is kneaded with a mixer. Liquid B is prepared by first mixing water and a setting modifier, adding a quick-hardening admixture thereto, and kneading with a mixer. Each of the liquids A and B in this manner becomes a liquid having fluidity and a pot life necessary for pumping by a pump.

Next, each liquid is sent to the injection site by a different system of pumping pump, and after inspecting the discharge amount, the end of each hose is connected to a continuous mixer, and this mixer (a type utilizing pumping energy) is used. After confirming that the mixture obtained in the step (1) is a hardened cement bitumen grout material of a predetermined quality, the mixture is poured into a ballast directly or via an injection funnel or the like.

In addition, the required strength of the grout material may vary depending on the type of the track, the site conditions, and the like. For example, for a filling track floor track, higher strength is required as compared with the above-described pavement track composition. On the other hand, the amount of the bitumen emulsion and the amount of the polymer emulsion are reduced. In addition, when the intensity is slightly changed, the required intensity can be dealt with by changing the discharge amount ratio of the liquid A and the liquid B.

Next, as the tip mixer for kneading the respective liquids A and B, any mixer having a simple structure, light weight and sufficient mixing can be used. For example, as shown in FIG.
It is preferable to use a line mixer of a type in which the tip of the liquid B hose 2 is attached to the outer tube 3a of the mixer and the stirring blade 3b is inserted into the mixer pipe. A line mixer may be connected in series as needed. There are various shapes of the stirring blade 3b, and its suitability is determined by a mixing test of the grout material.

Further, the remaining material treatment and cleaning of each hose of the liquid A and liquid B, which are essential steps at the end of the pouring operation, are performed, for example, as shown in FIG. That is, in the case of the liquid A, because of the cement bitumen mortar, sand often remains on the bent portion of the hose or the portion where the pipe diameter changes, causing blockage of the hose. Therefore, the cleaning is performed separately from the root 1a of the pressure feeding of the A liquid hose 1 to the intermediate part 1b and the tip part 1c. For example,
At the time of cleaning the root portion 1a, the A liquid valves 4a and 4b and the water system valve 5a are closed, the connection valve 6a and the waste liquid tank valve 7a are opened, water is pumped from the water hose 9, and the remaining material is discharged to the waste tank 7. The inside of the base 1a of the A liquid hose 1 is cleaned.

Next, at the time of cleaning the intermediate portion 1b, the valves A, 4c, the water system valve 5b, and the connection valve 6a are closed, and the A liquid valve 4b, the water system valve 5a, the connection valve 6b, the waste liquid tank valve are closed. Each valve 7a is opened, water is pressure-fed from the water hose 9 to discharge the residual material to the waste liquid tank 7, and the intermediate portion 1b is washed. Hereinafter, the waste liquid treatment is performed up to the tip by the same operation. Long-distance cleaning was made possible by this divided cleaning method.

Next, in the case of the liquid B, since it is a rapidly hardened material slurry and is a liquid of a fine powder having an extremely good fluidity, the liquid B hose 2 can be collectively or in the same manner as the liquid A from the pressure-feeding end of the liquid B hose 2. The remaining material is discharged to the waste liquid tank 8 by washing by division. In the drawings, reference numeral 10 denotes an A liquid mixer, 11 denotes an A liquid pump, 12 denotes a B liquid mixer, 13 denotes a B liquid pump, 14 denotes a water tank, and 15 denotes a water pump.

When the clay-based muddy water is to be pumped and washed, after the pouring operation, the muddy water is first pumped into the liquid A hose 1 and then washed with water by the above method.
This is for liquid A, because of cement bituminous mortar,
A solution to the fact that sand often remains at the bent part of the hose and the part where the pipe diameter changes, and it took a considerable amount of water and a long time to completely wash away the sand remaining in the hose with only water. It is. That is, in the case where the solution A is subjected to pressure feeding and washing with bentonite muddy water after completion of the pouring operation, sand and other precipitates remaining in the hose can be washed away with a small amount of total water used.

Examples of the above-mentioned thixotropic clay mud include bentonite mud, mud such as porcelain clay, acid clay, kaolin and the like. Any muddy water can be used as long as it has thixotropic properties when dispersed in water. An effective washing mud can also be prepared by adding a simple admixture having a thickening effect such as a cellulose type, a starch type, a polyacrylate type or the like to these muddy waters.

[0039]

Embodiments of the present invention will be described below. First Example For the quality improvement required to ensure the required performance of the grout material, the composition shown in Table 1 was used, and the cement bitumen mortar (solution A) and the rapidly hardened material slurry (solution B) were separately kneaded. The two liquids were mixed, and the working life, the compressive strength, and the sedimentation state of sand and the like were observed. Table 2 shows the test results.

[0040]

[Table 1]

[0041]

[Table 2]

(1) Materials used a Cement Ordinary Portland cement: Commercial product Blaine value = 3390c
m ² / g Specific gravity = 3.16 b Sand No.6 silica sand: Commercial product Maximum particle size = 1.18mm, FM = 1.28, Specific gravity = 2.61 c Bituminous emulsion For nonionic cement mixing: Commercial product QT emulsion, specific gravity =
1.0018, evaporation residue = 61 wt%, penetration: 85 d Polymer emulsion SRB latex: Commercial product, viscosity (CP / 25 ° C.) = 102, non-volatile content = 47.5 wt%, PH = 8.2 e calcium aluminate : commercially available products C ₁₂ A ₇ mineral Blaine = 6300cm ² / g f plaster: commercially type II anhydrous gypsum, Blaine value = 6000 cm
² / g g Inorganic fine powder (a) Fly ash: Commercial product (b) Burnt clay: Commercial product (c) Blast furnace slag: Commercial product Blaine value = 5760 cm ² / g h Setting regulator: Commercial product Reagent, citric acid: Potassium carbonate =
3: 1 i Water: tap water (2) Mixer Medium mixer: Capacity = 23.6 liters, using beater blades

(3) Test method a Pot life According to the J-roth method of JSCE “PC grout test method”, progress until the flow time of the mixture of the cement bitumen mortar and the rapid hardening material slurry exceeds about 10 seconds. Hours (minutes). b Compressive strength According to the uniaxial compression test method for a φ5 × 5 cm cylindrical specimen. However, loading speed = 0.5 mm / min, temperature = 20 ° C. (4) Test results As apparent from comparison with the conventional comparative example 1 shown in Table 2,
By blending the inorganic fine powder with the hardened material slurry, the pot life is shortened and the
The long-term strength tends to increase. In addition, there is no visible sedimentation of sand or the like . From these results, it can be seen that the traffic is quickly opened after the injection, the long-term load resistance is excellent, and a homogeneous cement bitumen cured product can be formed. However, when the inorganic fine powder was excessively mixed ( Comparative Example 8 ) , the setting
Absorbing agent is adsorbed on inorganic fine powder (baked clay) in large quantities and condenses
The action of the regulator is reduced and the pot life is very short. Ma
In addition, since the amount of inorganic fine powder is large,
Requires a large amount of added water (Table 2, comparison
Example 8, rapid hardener slurry water column) Short and long term compressive strength is remarkable
Inferior.

Next, the type and formulation of the inorganic fine powder, for varying the amount of calcium aluminate and gypsum (actual施例9-12), but short-length respectively is observed, by any blending inorganic fine powder It has been verified that there is no material separation and that it is effective in increasing short- and long-term strength.

(1) Formulation The formula used is for pavement tracks. Pump pumping method (2
Table 3 summarizes the standard formulation and the actual formulation of the liquid method). This
The composition shown in Table 1 is obtained by dividing the composition of the direct injection method (one-liquid method) into the A liquid and the B liquid in order to secure a pot life capable of performing pumping.

[0046]

[Table 3]

(2) Materials used a Cement Ordinary Portland cement: Commercial product Blaine value = 3390
cm ² / g, specific gravity = 3.16 b sand No. 6 silica sand: commercial product Maximum particle size = 1.18 mm, FM = 1.28, specific gravity = 2.61 c Bitumen emulsion For nonionic cement mixing: commercial product QT emulsion, specific gravity =
1.0018, evaporation residue = 61 wt%, penetration = 85 d Polymer emulsion SRB latex: Commercial product, viscosity (CP / 25 ° C) = 102, nonvolatile content = 47.5 wt%, PH = 8.2 e Setting regulator : Commercial product Reagent, citric acid: Potassium carbonate =
3: 1 f Antifoaming agent: Commercial product Antifoaming silicon, TSA730A, specific gravity = 1.01 g Aluminum powder: Commercial product Same as JIS K5906 Class 2 Al component = 98.6 wt%, specific gravity = 0.2-0.3 h Rapid hardening admixture: Mixture of calcium aluminate, gypsum and inorganic fine powder of the first embodiment, Blaine value = 5700
cm ² / g, specific gravity = 2.93 i Water: tap water

(3) Equipment to be used a Mixer: 400 liters x 2 for liquid A 200 liter x 2 for liquid B Line mixer for mixed liquid, 2 inches in diameter b Pump: Liquid A discharge rate = max 195 liter / min discharge pressure = max32kgf / cm ² B-liquid discharge rate = Max42 liters / min discharge pressure = max30kgf / cm ² for water BG -10 inch (Toho manufactured underground KOKI) c pumping hose: A solution for φ2 inch rubber hose, withstand voltage = 30 kgf / cm ² B liquid φ2 / 3 inch rubber hose, withstand pressure = 50 kgf / cm ² water φ1.25 inch rubber hose, withstand pressure = 50 kgf / cm ² Each hose is 500 m long. d Flow meter: Industrial electromagnetic flow meter, 50 mm in diameter for A liquid B 15 mm in diameter for B liquid e Tank: For waste liquid of A liquid = 5 m ³ Capacity for waste liquid of B liquid = 3 m ³ Capacity for water = 5 m ³

(4) Test method a. Kneading temperature The temperature of the AB liquid mixture is measured with an alcohol rod thermometer. b Flow time Consistency of each solution is JSCE J-roth (640cc)
Measure the number of seconds flowing down. c Pot life According to the J-roth method of JSCE "Testing method for PC grout", elapsed time (minutes) until the flow time of the mixture of the cement bitumen mortar and the hardened material slurry exceeds about 10 seconds. d Weight of unit volume and amount of air Measure the unit volume weight using a 1150cc Erlenmeyer flask.
The amount of air is calculated by the following formula. Air volume (%) = (theoretical unit weight-actual unit weight) x
100 / theoretical unit volume weight e. A sample is taken in a graduated cylinder having an expansion rate of 250 cc and the height of the top surface is measured using a caliper. The expansion rate is calculated by the following equation. Expansion coefficient (%) = 0.000314 (H ₀ -H ₂₄ ) D where H ₀ : height of sample top surface immediately after sampling (mm) H ₂₄ : height of sample top surface after 24 hours (mm), D: female Cylinder diameter (mm) f Breathing rate Measured by the polyethylene bag method of JSCE. Breathing rate (%) = breathing water after 24 hours (cc) x 10
0 / Volume of sample (cc) g Compressive strength φ5 × 5cm Determined by the uniaxial compression test method for cylindrical specimens. However, loading speed = 0.5mm / min, temperature = 20 ° C. H Material separation φ5 × 5cm After curing the sample for 28 days, divide it into upper and lower halves, measure the unit volume weight of each, and determine by the following formula. Material separation degree (%) = (lower unit volume weight-upper unit volume weight) x 1/2 x 100 / upper and lower average unit volume weight i Static elastic modulus φ5 x 5 cm Measure the amount of strain in the range of 0 to ² kgf / cm ² stress during compression loading, and determine by the following formula. Static elastic modulus (kgf / cm ² ) = δ / (ΔL / L) where δ: stress (kgf / cm ² ), ΔL: deformation (mm), L:
Specimen height (mm) j Using a prismatic specimen with a bending strength of 4 x 4 x 16 cm, perform a centralized loading test, and determine it using the following formula. Bending strength (kgf / cm ² ) = 3PL / 2bh P: load (kgf), L: span (cm), b: width of specimen (cm) h: height of specimen (cm) k Shear strength Using a 4 × 4 × 16 cm prismatic specimen, a two-plane shear test is performed directly and determined by the following equation. Shear strength (kgf / cm ² ) = P / (2bh) P: load (kgf), b: width of specimen (cm), h: height of specimen (cm)

(5) Test results Table 4 shows the properties of the unhardened cement hardened bitumen grout material before and after pumping, and Table 5 shows the properties after hardening.
Table 6 shows the pressure and discharge amount of the pumping device.

[0051]

[Table 4]

[0052]

[Table 5]

[0053]

[Table 6]

Regarding the quality of the grout material (1) Workability As shown in Table 4, the flow times of the solution A and the solution B were determined by the former.
With 8.8 seconds and the latter about 4.2 seconds, the fluidity was extremely good, and the pot life was at least 120 minutes. Table 6
As shown in the figure, the pressure at the time of 500 m pumping is 8 to 12 kgf / cm
^2. Liquid B was 7 to 8 kgf / cm ² , all of which were on the safe side at 1/3 or less of the maximum pump pressure, and it was confirmed that there was no problem in pumping. Next, the A / B mixed liquid has a flow time of 6.8 seconds and a pot life of about 5 minutes after being pumped,
No. 5 crushed stone (20
1313 mm) and that the ballast could be filled sufficiently, and it was found that there was no problem in the injection work.

(2) Uncured Properties As shown in Table 4, the A / B mixed liquid has no breathing, an expansion rate of about 0.1%, and an air volume of about 1.3%, all of which satisfy the required properties. I was (3) Physical properties after curing a Various strengths As shown in Table 5, the compressive strength of the cured grout material is as follows:
3.5 kgf / cm ² (design value, δ1h = 2 kgf / cm ² or more) for 1 hour of material age, 48 kgf / cm ² (design value, δ28d = 30 kgf / cm for 28 days of material age)
² or more). In addition, the bending strength and the shear strength obtained practically sufficient values. From these results, it was confirmed that the cured product had sufficient load resistance at the time of first passage of electricity and subsequent service. b Other characteristics static elastic modulus is about 1700kgf / cm ² before and after in wood age 28, approximately 2 Ketahodo small compared to the general concrete, it is resiliently excellent material. The degree of material separation was as low as about 0.4%, and it was found that it was considerably homogeneous.

From the quality test results described above, the pressure of the present invention
It was proved that the transfer method was very effective in improving homogeneity and increasing short- and long-term strength by using bitumen grout for hardened cement for railways. As shown in Tables 4 and 5, regarding the mixing performance of the tip mixer, as shown in Tables 4 and 5, when the liquid A and the liquid B were mixed by the continuous mixer of the present invention, the standard mixture before the liquid pumping (mixed by hand kneading sufficiently) Compared with (1), there was no difference in terms of the uncured properties of the mixed solution and the physical properties of the cured product, and it was confirmed that the mixture had a sufficient mixing ability as a mixer.

Remaining Material Treatment in Hose At the end of the operation of the above-mentioned pressure feeding test, the insides of the hoses of the solution A and the solution B were cleaned by the procedure of the divided cleaning method shown in FIG. Specifically, since the pumping distance was 500 m, a water hose was separately added about 500 m. Residual material treatment in A liquid hose
A connection to the water hose is provided at 1/3 and 2/3 of the hose length.First, only 1/3 of the pump side is washed with water, then 2 /
Only 3 was washed with water, and finally the remaining 1/3 was washed with water, and the treatment of the entire length of the liquid A hose was completed. As for the residual material treatment in the liquid B hose, since the liquid B itself is a slurry with very good fluidity, attach a water hose to the end of the hose and wash the inside of the 500m hose together with water, without any trouble. Work was successfully completed. From the above results, it has been verified that the split cleaning method of the present invention is very effective for the remaining material treatment in the hose, which is an indispensable step in grouting and pouring. It can be easily understood that the pumping distance can be further extended by increasing the number of divided sections.

[0058]

According to the present invention described in detail above, cement, a rapid-hardening admixture, a bitumen emulsion, a polymer emulsion, a fine aggregate, a setting modifier, an antifoaming agent, a foaming agent and water are added. In the construction method of the rapid hardening cement bitumen grout material for railways, the grout material is mixed with the liquid A of cement bituminous mortar.
Divided into two liquids, B and rapid hardened material slurry.
After adding the setting modifier and kneading separately, each liquid
Pressure feed through another long distance flow path, and continuous at the end of the flow path
Solution A and Solution B can be mixed and injected using a mixing mixer.
By making it workable, the kneading and pouring operations of the grout material of the present invention become very simple, and a high-quality cured product can be formed. In addition, a pumping system for water is additionally provided in addition to the pumping system for the two liquids described above. At the end of the injection work, the pumping system for the liquid A and the liquid B is sequentially divided and washed from the pump side by the pumping system, thereby performing pumping work. Has the effect that the distance can be greatly extended.

Further, the flow of the liquid A system is washed by pressurizing clay-based muddy water at the end of the pouring operation, so that the amount of washing water used is reduced, and the hose can be washed in a short time and reliably. effective.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing kneading, pressure feeding, and pouring of a grout material showing an embodiment.

FIG. 2 is an explanatory diagram of a continuous mixer.

FIG. 3 is an explanatory view showing a method of cleaning the inside of each hose of the liquid A and the liquid B.

[Explanation of symbols]

 Reference Signs List 1 liquid A hose 2 liquid B hose 3a outer tube of mixer 3b stirring blade 4a, 4b, 4c liquid A valve 5a, 5b water system valve 6a, 6b connection valve 7 waste tank 7a waste liquid tank valve 8 waste liquid tank 9 water hose

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C04B 14:06 24:36 24:26 22:06 22:14 18:08) 111: 70 C09K 103 : 00 (73) Patent holder 391000863 Japan Integrated Waterproofing Co., Ltd. 4-20 Sendagaya, Shibuya-ku, Tokyo (72) Inventor Makoto Hayakawa 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Railway Company (72) Invention Person Masanobu Koseki 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Railway Company (72) Inventor Shigeru Miura 2-8-8 Hikaricho, Kokubunji-shi, Tokyo 38 Railway Technical Research Institute (72) Invention Person Katsutoshi Ando 2-8-8 Hikaricho, Kokubunji-shi, Tokyo 38 Inside the Railway Technical Research Institute (72) Inventor Yutaka Harada 7-3-7 Roppongi, Minato-ku, Tokyo Toa Road Industry Co., Ltd. Inside the company (72) Inventor Kenji Kobayashi 7-3-7 Roppongi, Minato-ku, Tokyo Toa Road Industry Co., Ltd. (72) Inventor Kenkichi Hirano 2209 Aomi, Aomi-cho, Nishikubiki-gun, Niigata Denki Chemical Industry Aomi Inside the plant (72) Masao Matsumoto 3-5-1, Asahimachi, Machida-shi, Tokyo Denki Kagaku Kogyo Co., Ltd. (72) Inventor Takehiko 4--20 Sendagaya, Shibuya-ku, Tokyo Japan Sogo Waterproof Stock Inside the company (72) Inventor Norio Takahashi 4-20 Sendagaya, Shibuya-ku, Tokyo Japan Sogo Waterproofing Co., Ltd. (56) References JP-A-6-1646 (JP, A) JP-A-3-5350 (JP, A JP-A-4-300231 (JP, A) JP-A-5-254908 (JP, A) JP-A-2-145469 (JP, A) JP-B-51-28924 (JP, B2)

Claims (3)

(57) [Claims] 1. A hardened cement bituminous grout material for railways comprising cement, a hardened admixture, a bitumen emulsion, a polymer emulsion, a fine aggregate, a setting modifier, an antifoaming agent, a foaming agent and water. in the process of the construction, cement bitumen-based grout material model
Divided into two parts, liquid A and liquid B
And kneaded separately with a setting regulator added to each
Later, each liquid is pumped through a separate long-distance channel,
Solution A and Solution B are mixed using a continuous mixing mixer at the end of the flow path.
Rapid hardening for railways characterized by mixing and allowing injection
Construction method for non-functional cement bitumen grout . 2. A system according to claim 1, wherein both the A liquid and the B liquid are fed.
A pumping system was added in addition to the water supply system.
The pumping system for A liquid and B liquid is switched from pump side by pumping system.
Rapid hardening cement for railways characterized by subdivision washing
Construction method of bitumen grout material. 3. The method according to claim 1, wherein at the end of the injection operation, the liquid A is added.
The pumping system is characterized by cleaning by pumping clay-based muddy water
Of hard cement cement bitumen grout for railway
Law.