JP2013173263A - Method for manufacturing precedingly supplying material for grout application, and grout application method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a precedingly supplying material for grout application capable of easily preparing the sufficiently mixed precedingly supplying material.SOLUTION: A method for manufacturing a precedingly supplying material for grout application includes: a process for filling a container 1, which has an upper surface 2, an lower surface 3 and a stirring space 7 formed between both upper and lower surfaces 2 and 3 and in which the cross sections (a) and (b) vertical in the up and down direction of the stirring space 7 are almost the same in shape, with a raw material containing cement, a thickener and water so that the product of the volume (L) of the container 1 and the filling ratio (volume%) of the raw material in the container 1 becomes 800 (L volume%); and a process for obtaining the precedingly supplying material in which the content of the thickener is ≥0.01 pts.mass and <1 pt.mass per cement of 100 pts.mass by shaking the container 1 in a vertical direction to stir the raw material.

Description

  The present invention relates to a method for producing a grout construction advance material and a grout construction method.

  Conventionally, in the construction of grout, grout slurry is injected into pipes such as hoses and ducts, and the grout slurry is pumped to the construction site. Here, when a part of the grout slurry adheres to the inside of the tube and hardens, the inside of the tube may be blocked and the grout slurry may not be pumped.

  On the other hand, a technique for preventing clogging of the grout slurry pressure feeding pipe by injecting a feed material is known (see Patent Document 1). For example, an electric stirrer is used for the preparation of such a feed material (see Patent Document 2).

JP-A-3-290564 JP-A-6-207158

  However, when the feed material is prepared, when the raw material is stirred with an electric stirrer, there is a problem that it takes time and effort to secure a power source, procure equipment, and clean the equipment after use. Moreover, when kneading by hand, since it cannot fully stir, it was difficult to prepare the advance material in which the component was fully mixed.

  An object of this invention is to provide the manufacturing method of the grout construction advance material which can prepare the fully mixed advance material easily. Moreover, an object of this invention is to provide the construction method of the grout using the advance material prepared by the said manufacturing method.

  In view of the above circumstances, the present inventors have intensively studied paying attention to the shape of the container for preparing the advance material and the blending of the raw materials, and found that the above problems can be solved.

  That is, the present invention has an upper surface and a lower surface, and a stirring space formed between the upper surface and the lower surface, and a container having a substantially identical shape with a cross section perpendicular to the vertical direction of the stirring space and the lower surface. Filling a raw material containing cement, a thickener and water so that the product of the capacity (L) of the container and the filling rate (volume%) of the raw material in the container is 800 (L / volume%) or less; A step of shaking the container up and down to stir the raw material and obtaining a feed material having a thickener content of 0.01 parts by mass or more and less than 1 part by mass with respect to 100 parts by mass of cement, and grouting Provided is a method for manufacturing a pre-feed material.

  According to the manufacturing method of the present invention, a sufficiently mixed advance material can be easily prepared. The reason why such an effect can be obtained is as follows: (1) By stirring the raw material using a container having a predetermined shape, the raw material is sufficiently brought into contact with the upper and lower surfaces of the container and stirred, and the aggregates in the advance material (2) By adjusting the product of the capacity of the container and the filling rate of the raw material to be within a predetermined range, it becomes easier to perform the stirring work, and the raw material can be sufficiently stirred in the container. (3) By making content of the thickener in a raw material into a predetermined range, it can be mentioned that the dispersibility and water retention property of the obtained advance feed material can be made compatible.

  In the production method of the present invention, the thickener preferably has a viscosity at 20 ° C. of 200 mPa · s or more and 100,000 mPa · s or less. By using a thickener having a viscosity in the above range, it is possible to produce a advance material having excellent water retention.

  In the production method of the present invention, the container is preferably a rectangular or cylindrical container. Since the shape of the cross section perpendicular to the vertical direction of the stirring space and the shape of the lower surface of the rectangular or cylindrical container are substantially the same, the raw materials in the container are efficiently and effectively applied to the upper and lower surfaces of the container. The advance material which can be made to contact and stir and was excellent in the dispersibility can be manufactured.

  Furthermore, the present invention provides a grout construction method comprising: a step of injecting a feed material produced by the above production method into a pipe; and a step of injecting and pumping a grout slurry behind the feed material injected into the pipe. provide. By injecting the advance material manufactured by the above manufacturing method into the pipe, injecting the grout slurry behind the advance material injected into the pipe and pumping it, the forward advance material is partially extruded while the inner wall of the tube is being extruded. Adhere to. Here, since the advance material manufactured by the above manufacturing method is excellent in water retention, the back grout slurry can be smoothly pumped by passing through the inside of the advance material attached to the inner wall of the pipe, and the grout slurry It is possible to prevent the tube from adhering to and hardening from the inner wall of the tube and clogging the grout slurry. As a result, the grout slurry can be smoothly pumped to the construction site, and the grout construction at the pumping destination can be easily and reliably performed.

  According to the present invention, it is possible to provide a manufacturing method of a grout construction advance material capable of easily preparing a sufficiently mixed advance material. Moreover, this invention can also provide the construction method of the grout using the advance material prepared by the said manufacturing method.

It is a figure which shows an example of the container used with the manufacturing method of the advance material for grout construction of this embodiment. It is sectional drawing along the II-II line of FIG. It is a figure which shows a normal bottle-shaped container. It is a figure which shows the modification of the container used with the manufacturing method of this embodiment. It is a figure which shows the state of the advance material in a pipe | tube and the grout slurry in the construction method of the grout of this embodiment.

  Hereinafter, preferred embodiments of a method for producing a grout construction advance material and a grout construction method of the present invention will be described.

  In the present specification, hydraulic mortar containing cement and sand is referred to as grout. Of these, a composition-like product may be called a grout composition, a liquid product may be called a grout slurry, and a cured product may be called a grout cured product.

(Producing method for advanced materials)
The manufacturing method of the grout construction advance material according to the present embodiment has an upper surface and a lower surface, and a stirring space formed between the upper surface and the lower surface, and a cross section perpendicular to the vertical direction of the stirring space and the lower surface In a container having substantially the same shape, the product of the capacity of the container (L) and the filling rate (volume%) of the raw material in the container is 800 (L / volume%) or less for the raw material containing cement, thickener and water. The filling step of filling the container and stirring the raw material by shaking the container up and down to obtain a feed material having a thickener content of 0.01 parts by weight or more and less than 1 part by weight with respect to 100 parts by weight of cement And a process for producing the advance material. Hereinafter, each process in the manufacturing method of the advance material for grout construction of this embodiment is explained in detail.

  In the filling step, first, a raw material for the advance material including cement, thickener and water is prepared.

  The type of cement is not particularly limited, and various portland cements such as normal, early strength, ultra-early strength, low heat and moderate heat, and various mixed cements in which these portland cements are mixed with blast furnace slag, fly ash and silica. Further, filler cement mixed with limestone powder or the like, alumina cement, or the like can be used, and one or more of these can also be used. Further, the cement that is the raw material of the advance material can be appropriately selected regardless of the type of cement used as the raw material of the grout.

The thickener is not particularly limited, and cellulose-based, starch-based, protein-based, and water-soluble polymer systems such as polyacrylamide and polyethylene oxide can be used. Among these, it is preferable to use a cellulose-based thickener containing water-soluble cellulose derivatives such as methylcellulose, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, glyoxal-added hydroxypropylmethylcellulose, carboxymethylcellulose and carboxyethylcellulose. In particular, among cellulose thickeners, it is more preferable to use a hydroxypropyl / methylcellulose thickener in which a part of the methoxy group is replaced with a hydroxypropoxy group (—OC ₃ H ₆ OH). By including the thickener, the advance material suppresses raw material separation and imparts water retention. Also, the viscosity and fluidity of the advance material can be adjusted.

  Content of a thickener is 0.01 mass part or more and less than 1 mass part with respect to 100 mass parts of cement. When the content of the thickener is less than 0.01 parts by mass, water retention cannot be obtained as the advance material. On the other hand, when the content of the thickener is 1 part by mass or more, the dispersibility of the advance feed material deteriorates and a large amount of aggregates are generated. When the content of the thickener increases in the advance feed material, separation of raw materials such as cement and water is suppressed (improvement of separation resistance), and water retention is improved. Improving the water holding capacity of the advance material is preferable in that the flow of grout slurry in the pipe can be made smoother. However, if the content of the thickener is too large, the dispersibility of the thickener in the advance material becomes worse. Aggregates are likely to occur. Therefore, it is preferable that the content of the thickener is an optimum amount in consideration of the balance between the water retention of the advance material and the dispersibility of the thickener. The content of the thickener is preferably 0.05 parts by weight or more and 0.9 parts by weight or less, more preferably 0.1 parts by weight or more and 0.8 parts by weight or less, with respect to 100 parts by weight of cement. More preferably, it is 0.15 mass part or more and 0.7 mass part or less.

  The thickener preferably has a viscosity at 20 ° C. of 200 mPa · s or more and 100,000 mPa · s or less. If the viscosity at 20 ° C. of the thickener is less than 200 mPa · s, the separation resistance of the raw material and the water retention capacity of the advance material tend to decrease, and if it is greater than 100,000 mPa · s, aggregates are generated in the advance material. It tends to be easier. The viscosity at 20 ° C. of the thickener is more preferably 250 mPa · s or more and 90,000 mPa · s or less, further preferably 300 mPa · s or more and 85,000 mPa · s or less, and particularly preferably 350 mPa · s or more and 80 or less. 1,000 mPa · s or less.

  The viscosity of the thickener can be measured as follows. First, the thickener is dried at 105 ° C. for 1 hour, and the water content of the thickener is calculated from the weight loss due to drying. Next, the water content of the obtained thickener is taken into consideration, and the aqueous solution is adjusted so as to be an accurate 2% aqueous solution. After the thickener is completely dissolved in the aqueous solution, the temperature of the aqueous solution is adjusted to 20 ± 0.1 ° C. and the viscosity is measured. The viscometer is not particularly limited. For example, a Brookfield type viscometer can be used.

  The blending amount of water is preferably 50 parts by mass or more and 1,000 parts by mass or less with respect to 100 parts by mass of cement. When the amount of water is less than 50 parts by mass, the dispersibility of the advance material becomes difficult to obtain, and when it is more than 1,000 parts by mass, the water retention of the advance material becomes difficult to obtain, and separation becomes easy. The blending amount of water is more preferably 60 parts by mass or more and 800 parts by mass or less, further preferably 70 parts by mass or more and 600 parts by mass or less, and particularly preferably 80 parts by mass or more and 400 parts by mass with respect to 100 parts by mass of cement. Or less. By adjusting the amount of water in this way, it is possible to adjust properties such as separation resistance, water retention and fluidity of the advance feed material.

  In the filling step of this embodiment, in addition to the cement, thickener, and water, for example, inorganic powders such as blast furnace slag and fly ash, emulsions such as acrylic and ethylene vinyl acetate, and latexes such as styrene butadiene are used as synthetic materials. A molecular material or the like may be blended with the raw material as long as it does not affect the properties of the advance material.

  The order in which the container is filled with cement, thickener and water is not particularly limited. Further, two substances (for example, cement and thickener) may be mixed in advance, and the remaining substance (for example, water) may be added later. Among these, a sequence in which cement and a thickener are mixed in advance and water is added later, or an order in which water is filled first and cement and a thickener mixed in advance are added later is preferable.

  The container used in this embodiment has an upper surface and a lower surface, and has a stirring space formed between the upper surface and the lower surface. Moreover, the cross section perpendicular | vertical to the up-down direction of stirring space and a lower surface are containers with substantially the same shape. The container may include a container body and a lid that is attached to the container body and seals the inside of the container.

  The upper surface of a container is a planar part in the upper part of a container. Further, the lower surface of the container is a planar portion at the lower part of the container and is the bottom surface of the container. The agitation space is a space in which the raw material formed between the upper surface and the lower surface is agitated, for example, the body portion of the container. Further, “substantially the same shape” includes the case where the size and the shape are substantially the same, and the case where the shape is different but the shape is substantially the same as a similar shape. Hereinafter, the container will be specifically described with reference to the drawings.

  FIG. 1 is a view showing an example of a container used in the method for producing a forward material for grout construction according to this embodiment, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. The container 1 is a rectangular container and has an upper surface 2, a lower surface 3, a handle portion 4, a lid portion 5, and a corner portion 6. Further, as shown in FIG. 2, a stirring space 7 in which the raw material is stirred is formed between the upper surface 2 and the lower surface 3. The container 1 can be filled with a raw material from an inlet (not shown) by opening the lid 5.

Vertical direction of the container 1 is represented by arrows Y _1. A cross section a (virtual surface) perpendicular to the direction of the arrow Y ₁ has substantially the same shape as the lower surface 3. In addition, a cross section b (virtual plane) that is located above the cross section a and perpendicular to the straight line Y ₁ has substantially the same shape as the lower surface 3. As described above, the container 1 having a rectangular shape has no obstacle (for example, a convex portion on the inside of the container) that hinders the flow of the fluid during the stirring of the raw material in the stirring space 7. For this reason, when the raw material is stirred, the container 1 is shaken in the vertical direction so that the flow of the raw material efficiently and effectively comes into contact with the upper surface 2 and the lower surface 3 of the container 1 and the fluid is uniformly stirred. Thereby, the dispersibility of each containing component improves and the advance material which generation | occurrence | production of the aggregate was suppressed can be obtained. In addition, the container 1 may have a convex part inside as long as the flow at the time of stirring of a raw material is not inhibited.

In the container 1 used in the manufacturing method of the present embodiment, it is preferable that the upper surface 2, the lower surface 3, and the cross sections a and b (virtual surfaces a and b) perpendicular to the vertical direction of the stirring space 7 have substantially the same shape. In this specification, “substantially the same shape” refers to a case where the area and the shape are substantially the same, or a case where the shapes are substantially the same, such as similar shapes but different in size.
The areas of the cross sections a and b are preferably substantially the same as the lower surface 3. For example, the area of the cross-sections a and b is preferably 60% or more of the area of the lower surface 3, more preferably 70% or more, still more preferably 80% or more, and particularly preferably 90% or more. Like the upper surface 2 of the container 1, the shape of the upper surface 2 may be different from the shape of the lower surface 3. The area of the upper surface 2 is preferably 60% or more of the area of the lower surface 3, more preferably 70% or more, still more preferably 80% or more, and particularly preferably 90% or more.

  FIG. 3 is a view showing a normal bottle-shaped container. A container as shown in FIG. 3 cannot be used in the manufacturing method of the grout construction advance material of this embodiment. The container 20 is a bottle-type container and has an upper surface 21, a lower surface 22, a handle portion 23, a cavity portion 24, and a lid portion 25. A stirring space 26 in which the raw material is stirred is formed between the upper surface 21 and the lower surface 22.

In the container 20, the vertical agitation space 26 is represented by arrow _{Y 2.} Arrow Y ₂ in the direction perpendicular cross section e (virtual plane), the size of the lower surface 22 is small is similar figure is substantially the same shape. However, substantially the same is located below the section e, linear Y ₂ and section perpendicular f (virtual plane), since it is the handle portion 23 and a cavity 24 is formed on the section f, the lower surface 22 It is not a shape. For this reason, even if the container 20 is shaken in the vertical direction when stirring the raw material, the flow of the raw material does not sufficiently contact the upper surface 21 and the lower surface 22 of the container 20. Further, in the case where the inside of the handle portion 23 is hollow and can accommodate the raw material, the flow of the raw material is also divided on the handle portion 23 side, and as a result, the upper surface 21 and the lower surface 22 of the container 20 are not sufficiently in contact , It becomes difficult to sufficiently mix the components. Thus, in the shape of the container 20, it is not possible to obtain a advance material that has excellent dispersibility and suppresses the generation of aggregates.

  In the agitation process of the present embodiment, the uniformly mixed feed material can be obtained by shaking the container 1 in the vertical direction and agitating the raw material filled in the container 1. Here, the method of shaking the container 1 shown in FIG. 1 in the vertical direction is not particularly limited. However, the handle part 4 formed on the upper side of the container 1 is held with one hand, and the other hand is held at the bottom or corner, For example, shaking with the corner 6 is preferable because the container 1 can be easily shaken in the vertical direction, and the raw materials can be sufficiently stirred.

  The time for shaking the container varies depending on the size of the container and the filling rate of the raw material. For example, the capacity of the container is 1 to 30 L, the filling rate is 1 to 90% by volume, and the capacity of the container (L ) And the filling rate (volume%) of the raw material in the container is 800 (L / volume%) or less, the time for shaking the container is preferably 10 to 180 seconds from the viewpoint of sufficiently stirring the raw material. More preferably, it is 15 to 160 seconds, More preferably, it is 20 to 140 seconds, Especially preferably, it is 30 to 120 seconds.

  In the manufacturing method of the present embodiment, the product of the capacity (L) of the container and the filling rate (volume%) of the raw material in the container is 800 (L / volume%) or less. When this value is larger than 800 (L / volume%), it is difficult to sufficiently stir the raw material in the container. The product of the container capacity and the raw material filling rate is preferably 700 (L / volume%) or less, more preferably 600 (L / volume%) or less, and even more preferably 500 (L / volume%) or less. .

  Although the capacity | capacitance of the container 1 will not be restrict | limited especially if the product of the container capacity | capacitance mentioned above and the raw material filling rate satisfy | fill the 800 (L * volume%) or less, From a viewpoint of the ease of a container's shaking, Preferably it is 1-30L. More preferably, it is 2-20L, More preferably, it is 3-15L, Most preferably, it is 4-10L. As a result, the raw material can be more sufficiently stirred.

  The feed rate of the feed material is calculated by calculating the capacity S (= Q / R, (L)) of the feed material from the preparation amount Q (kg) of the feed material and the specific gravity R (kg / L) of the feed material. The filling rate T (= S / P × 100, (volume%)) can be calculated from the capacity S (L) of the advanced feed material and the capacity P (L) of the container. The specific gravity R of the advance material may be calculated from the specific gravity before mixing the cement, the thickener, and water, or the specific gravity of the slurry-like advance material after mixing.

  Since the advance material obtained by the above-mentioned stirring step has a property of being easily cured, it is preferable to immediately inject it into the grout slurry pressure feed tube after preparation.

  The water retention capacity of the postponed material is specified in the special specifications (1997 version) of the Housing and Urban Development Corporation Tokyo Branch and Kanto Branch. It can be measured according to “3.5 water retention test” in the premix polymer cement mortar for initial repair. The water retention value is represented by the length of water (mm) spread on the filter paper (diameter 110 mm).

  In the advance material of the present embodiment, the water retention is preferably less than 110 mm, that is, a range in which moisture does not spread more than the diameter of the filter paper, more preferably within 106 mm, further preferably within 102 mm, and particularly preferably. It is within 98 mm. Here, when a thickener is added to the advance material, separation of raw materials such as cement and water is suppressed, and water retention is improved.

  FIG. 4 is a view showing a modified example of the container used in the manufacturing method of the grout construction advance material according to the present embodiment. The container 10 includes a substantially cylindrical container body 10 a and a lid portion 14, and the container body 10 a has a lower surface 12 and a side surface 13. The lid portion 14 forms the upper surface 11 of the container 10. Further, a stirring space 15 in which the raw material is stirred is formed between the upper surface 11 and the lower surface 12. In addition, the container 10 can be filled with a raw material from an inlet (not shown) by opening the cover part 14.

Vertical direction of the container 10 is represented by an arrow _{Y 3.} A cross section c (virtual surface) perpendicular to the direction of the arrow Y ₃ has substantially the same shape as the lower surface 12. Further, at a position that narrowed diameter conically toward the lid portion 14 a above the section c, arrow Y ₃ and section perpendicular d (virtual plane) is smaller in magnitude than the lower surface 12 They are similar and have approximately the same shape. Since the container 10 having such a shape does not have an obstacle (for example, a convex portion on the inside of the container) that obstructs the flow of the raw material in the stirring space 15, the container 10 is moved vertically when the raw material is stirred. The raw material flow efficiently and effectively comes into contact with the upper surface 11 and the lower surface 12 of the container 10 and is uniformly stirred. Thereby, the dispersibility of each containing component improves and the advance material which generation | occurrence | production of the aggregate was suppressed can be obtained. As in the case of the container 1, a convex portion may be present inside the container as long as the flow during stirring of the raw material is not hindered.

  In the stirring step, the method of shaking the container 10 shown in FIG. 4 in the vertical direction is not particularly limited. For example, the lid 14 can be pressed with one hand and the other hand can be shaken with the lower surface 12 of the container 10. . If it does in this way, it will be easy to shake the container 10 to an up-down direction, and it will become easy to fully stir a raw material. In addition, the suitable range of the product of the cross section of the container 10, an upper surface, a capacity | capacitance, a filling rate, and a container capacity | capacitance and a raw material filling rate is the same as the container 1.

(Grouting method)
The grout construction method of the present embodiment includes a step of injecting a grout construction advance material produced by the above production method into a pipe, and a step of injecting and pumping grout slurry behind the advance material. Hereinafter, an embodiment of the present construction method will be described with reference to FIG.

  FIG. 5 is a diagram showing a state of the advance material and grout slurry in the pipe in the grout construction method of the present embodiment. The advance material used here can be manufactured by the manufacturing method of the advance material for grout construction which concerns on the said embodiment.

  Fig.5 (a) is sectional drawing which shows a part of cross section along the longitudinal direction of the pipe | tube 30 which pumps grout slurry. The inside of the tube 30 is a cavity. As long as the pipe | tube 30 has a space which can pump a grout slurry, an internal diameter etc. will not be restrict | limited in particular. Moreover, the pipe | tube 30 should just be tubular things, such as a hose and a duct, The material of a pipe | tube is not restrict | limited in particular, For example, resin-made things, such as metal or a plastic, can be used.

  FIG. 5B shows a state in which the prepared advance material 31 is injected into the pipe 30. In the construction method of this embodiment, first, the advance material 31 is injected into the pipe 30. The advance material 31 may be directly injected into the pipe 30 from a container (for example, the container 1) prepared by stirring the raw materials, or may be injected using a pump or the like.

  The advance material 31 is preferably injected as close to the inlet of the tube 30 as possible in order to prevent clogging of the grout slurry injected later in the tube 30. In addition, injecting a liquid such as water in accordance with the injection of the advance material is preferable in terms of improving the fluidity of the advance material during pressure feeding. However, if the amount of water or the like to be injected at the same time is too large, the advancement material may be prevented from adhering to the inner wall of the tube. For this reason, it is preferable to use liquids, such as water, in the range which does not inhibit the function of a advance material.

  What is necessary is just to adjust suitably the quantity of the advance material 31 to inject | pour according to the length of the pipe | tube 30 to pump, ie, the distance to the place where grout is constructed, the internal diameter of a pipe | tube, etc.

  FIG. 5 (c) shows a state in which the grout slurry 32 has started to be injected behind the previously fed advance material 31, and FIG. 5 (d) shows the tube 30 while the grout slurry 32 extrudes the front advance material. It shows a state of being pumped in the direction of the outlet. The advance material 31 extruded to the rear grout slurry 32 moves while attaching a part 31 b of the advance material 31 to the inner walls 40 a and 40 b of the pipe 30.

  Here, since the advance material 31 adhered to the inner walls 40a and 40b of the pipe 30 is excellent in water retention, the rear grout slurry 32 passes smoothly inside the advance material 31b attached to the inner wall of the pipe. Pressure feeding is possible, and it is possible to prevent the grout slurry 32 from adhering to and hardening from the inner walls 40a and 40b of the tube 30 and the grout slurry from blocking the tube. As a result, the grout slurry 32 can be smoothly pumped to the construction site, and the grout can be constructed at the pumping destination.

  In order to pump the grout slurry, for example, a pump can be used. The performance such as the conveying ability of the pressure pump may be appropriately selected according to the amount of grout slurry to be pressure-fed.

  In the grout construction method of the present embodiment, the advance material 31 produced by the method for producing the grout construction advance material according to the embodiment is used. The advance material 31 is sufficiently mixed and can be easily prepared. Since the advance material 31 is excellent in water retention, the rear grout slurry 32 passes through the inside of the advance material 31 b attached to the inner walls 40 a and 40 b of the pipe 30. For this reason, smooth pumping of the grout slurry 32 is possible, and the grout slurry 32 is sufficiently suppressed from adhering to and hardening from the inner walls 40a and 40b of the tube 30 and the grout slurry blocking the tube 30. it can. As a result, the grout slurry can be smoothly pumped to the construction site, and the grout construction at the pumping destination can be easily and reliably performed.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  The contents of the present invention will be specifically described below with reference to examples. Note that the present invention is not limited to these examples.

(material)
Cement: Hayashi Portland cement (manufactured by Ube Mitsubishi Cement Co., Ltd., Blaine specific surface area = 4500 cm ² / g)
Water: Tap water Thickener A: Hydroxypropylmethylcellulose thickener (Matsumoto Yushi Seiyaku Co., Ltd., viscosity 400 mPa · s)
Thickener B: Hydroxypropylmethylcellulose thickener (Matsumoto Yushi Seiyaku Co., Ltd., viscosity 15,000 mPa · s)
Thickener C: Hydroxypropylmethylcellulose thickener (Matsumoto Yushi Seiyaku Co., Ltd., viscosity 75,000 mPa · s)

(Use container)
Table 1 shows the containers used for preparing the advance material. In Table 1, the rectangular molds A to C are the same as the container 1 shown in FIG. 1, the cylindrical molds A and B are the same as the container 10 shown in FIG. 4, and the bottle-type containers are the same as the container 20 shown in FIG. It is the shape.

(Calculation method of filling rate)
The material filling rate of the advance material is calculated by calculating the capacity S of the advance material from the preparation amount Q of the advance material and the specific gravity R of the advance material, and the filling rate is calculated from the capacity S of the obtained advance material and the capacity P of the container. . Table 2 shows a calculation example. The specific gravity R of the advance material was the specific gravity of the slurry-like advance material after mixing cement, a thickener, and water.

(Dispersibility evaluation method)
The dispersibility of the advance material was evaluated visually in 5 stages as follows based on the presence or absence of aggregates after passing the prepared advance material through a mesh (2 mm aperture).
1: There is no aggregate.
2: There is almost no aggregate.
3: There are some aggregates.
4: There are many aggregates.
5: There are very many aggregates.

(Measurement method of water retention)
For water retention of postponed materials, please refer to “3.5 Water retention test” in “3. Premix polymer cement mortar for initial repair” in the special specifications (1997 version) of the Housing and Urban Development Corporation Tokyo Branch and Kanto Branch. Measured according to. First, a 5A filter paper prescribed on a filter paper (JIS P 3801 [filter paper (for chemical analysis)]) on a glass plate (polish glass (150 × 150 × 5 mm) prescribed on JIS R 3202 (float plate glass and polished plate glass)). (Diameter 110 mm)) was placed, and a ring mold (made of brass, inner diameter 50 mm, height 10 mm, thickness 3 mm) was installed at the center.

  Next, the prepared advance material was smoothly packed in a ring frame with a metal spatula. Immediately thereafter, the glass plate was put on top of the ring frame, turned upside down, and allowed to stand with the filter paper portion on top. The length of the direction in which the spread of moisture that had exuded to the filter paper after 5 minutes was recognized as the maximum and the length in the direction perpendicular thereto was measured in units of 1 mm using a caliper. In the test, a total of six locations were measured for three specimens, and the average value was taken as a value indicating the water retention of the advance material.

(Evaluation method for workability)
As workability, the ease of mixing at the time of preparing the advance material and the ease of cleaning the container after the preparation were evaluated in three stages A to C as follows.
A: Easy to mix or wash.
B: Mixing or cleaning is somewhat difficult.
C: It is difficult to mix or wash.

(Examples 1-5 and Comparative Examples 1-3)
The mixing ratio of the advance material, the type of the container, and the preparation amount of the advance material were as shown in Table 3, and the advance material was prepared. Specifically, a predetermined amount of cement and thickener A were filled in the container as raw materials, and premixed by shaking the container for 30 seconds. Next, a predetermined amount of water was filled in the container, the container was shaken in the vertical direction for 60 seconds, and the raw material in the container was agitated to obtain a advance material. Table 3 shows the raw material filling rate, the calculation result of the product of the capacity of the container and the raw material filling rate, and the measurement results of the dispersibility, water retention and workability of the obtained advance feed material.

  As shown in Table 3, the shape of the container is a rectangular shape or a cylindrical shape, and the advance materials of Examples 1 to 5 in which the content of the thickener and the capacity of the container and the filling rate of the raw materials are within a predetermined range are dispersed. Excellent in workability and water retention, and excellent in workability. On the other hand, the advance material of the comparative example 1 of the bottle type whose container shape is the same as that of FIG. 3, and the advance material of the comparative examples 2 and 3 in which the capacity of the container and the filling rate of the raw materials are not within the predetermined range are dispersibility, At least one of water retention or workability was inferior.

(Examples 6 to 11 and Comparative Examples 4 to 8)
The type of thickener and the content of the thickener were as shown in Table 4, and the advance material was prepared in the same manner as in Example 1. Table 4 shows the measurement results of dispersibility, water retention and workability of the obtained advance feed material.

  As shown in Table 4, the advance materials of Examples 6 to 11 in which the content of the thickener is 0.2 parts by mass or 0.5 parts by mass with respect to 100 parts by mass of cement are excellent in dispersibility and water retention. Also, workability was excellent. On the other hand, the advancement materials of Comparative Examples 4 to 8 in which the content of the thickener is 0 part by mass or 1.0 part by mass or more with respect to 100 parts by mass of cement has at least one of dispersibility, water retention or workability. It was inferior.

(Example 12 and Comparative Examples 9 and 10)
In Example 12, the advance feed material of Example 1 was used and a grout pressure-feed test was performed. On the other hand, in Comparative Example 9, grout was used as the advance material. In Example 12 and Comparative Example 9, water was also injected at the same time as the advance material, and the grout slurry was continuously pumped so as not to be interrupted while pumping the feed material slurry. In Comparative Example 10, no advance feed material was used, and only water was pumped until water came out from the tip of the tube, and then the grout slurry was pumped.

  In Example 12 and Comparative Examples 9 and 10, the grout was prepared by adding water having a water / grout ratio of 16% to a commercially available premix type cement-based non-shrink mortar (Ube Industries, U-grout M). A grout slurry was used. Moreover, the pumping pump (The snake type pumping pump made from Hyojin Equipment Co., Ltd.) was used for pumping grout slurry. The test results are shown in Table 5.

  As shown in Table 5, in Example 12 using the advance feed material of Example 1, grout slurry could be pumped without causing clogging in the pipe at 50 to 100 m. On the other hand, in Comparative Example 9, the clogging in the pipe occurred in the 75 m and 100 m pumping. Further, in Comparative Example 10, the clogging in the pipe occurred in all the pumping operations.

DESCRIPTION OF SYMBOLS 1,10 ... Container, 2, 11 ... Upper surface, 3, 12 ... Lower surface, 5, 14 ... Lid part, 7, 15 ... Stirring space, 30 ... Pipe, 31, 31b ... Advance material, 32 ... Grout slurry.

Claims (4)

A container having an upper surface and a lower surface, and a stirring space formed between the upper surface and the lower surface, and having a cross section perpendicular to the vertical direction of the stirring space and the lower surface having substantially the same shape, cement, Filling a raw material containing a thickener and water so that the product of the capacity (L) of the container and the filling rate (volume%) of the raw material in the container is 800 (L / volume%) or less; ,
Shaking the container in the vertical direction and stirring the raw material to obtain a feed material in which the content of the thickener is 0.01 parts by mass or more and less than 1 part by mass with respect to 100 parts by mass of the cement; A method for producing a grout construction advance material.   The said thickener is a manufacturing method of Claim 1 whose viscosity in 20 degreeC is 200 mPa * s or more and 100,000 mPa * s or less.   The manufacturing method according to claim 1 or 2, wherein the container is a rectangular or cylindrical container. Injecting the advance material produced by the production method according to any one of claims 1 to 3 into a pipe;
And a step of injecting and feeding a grout slurry to the rear of the advance material injected into the pipe.

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