JP7197290B2 - Anchor element fixing method and hydraulic composition used therefor - Google Patents

Description

The present invention relates to an anchor element fixing method for fixing anchor elements such as reinforcing bars and anchor bolts to concrete structures such as culverts, dam bodies, buildings, and bedrock, and to a hydraulic composition used therein.

In order to increase the seismic strength and durability of existing concrete man-made structures such as culverts, dam bodies, tunnels, and buildings, reinforcement work is being carried out to improve shear strength. In addition, construction work is being carried out to attach structures such as falling rock protection nets and avalanche prevention fences to so-called reinforced concrete, which covers slopes and prevents them from collapsing, as necessary. In these constructions, a cylindrical hole is drilled in the concrete frame and bedrock that form the concrete structure with a rotary tool such as a drill or core boring machine, a hardening fixing agent is added, and then Anchor elements such as rebars and anchor bolts are driven in and fixed.

A hydraulic composition containing cement is used as a fixing agent used in such anchor element fixing work. In the anchor element fixing work, this hydraulic composition is mixed with water to prepare a hardening paste, which is filled between the anchor element and the inner wall surface of the drilled hole, and cured to harden the hardening paste. to obtain a cured product. The amount of water relative to the hydraulic composition is predetermined so that the cured product exhibits the desired strength, and it is necessary to evenly mix the two. As a method for preparing this curable paste, a method is known in which a hydraulic composition contained in a bag-like pouch container and water are mixed in the pouch container.

For example, in Patent Document 1, a pouch container divided into two by a partition contains a hydraulic composition in the upper storage part, and a pouch container containing water in the lower storage part. After removing the partition by pulling the hydraulic composition and dropping the hydraulic composition into the water, the two are mixed by kneading or shaking the pouch container by hand or by applying vibration with a machine to form a curable paste. A method of using the pouch container to prepare is described. Since this method does not require a large-scale kneading device, it can be easily applied to anchor element fixing work.

However, this method of using the pouch container can accommodate only the amount that the partition can withstand the weight of the hydraulic composition, and the hydraulic composition in the pouch container is limited to a small amount. The amount of paste is also limited to a small amount. Therefore, it is suitable for small-scale anchor element fixing work, for example, where the number of construction locations is from 2 to 3 to about 10 locations. However, when this pouch container is used for medium-scale or larger anchor element fixing work, such as more than 20 locations, it is necessary to prepare the curable paste many times. In addition, according to the method of kneading or shaking the pouch container by hand when mixing the hydraulic composition and water, it is difficult to keep the quality of the prepared curable paste constant, depending on the skill of the operator. be. On the other hand, Patent Literature 1 describes that a hydraulic composition and water are mixed by mechanically imparting vibration, but does not disclose a specific mixing method.

JP 2011-25424 A

The present invention has been made to solve the above problems, and is applicable not only to small-scale anchor element fixing work but also to medium-scale anchor element fixing work. It is an object of the present invention to provide a method for fixing an anchor element and a hydraulic composition used therefor, which can always prepare a curable paste of the same quality by mixing and kneading together.

（化学式（１）中、Ｒ ^１ は水素原子又はメチル基であり、Ｒ ^２ は炭素数２～４のアルキレン基であり、Ｒ ^３ は炭素数２～５のアルキル基であり、ｎは１～１００の正数である。）で表される単量体（１）及び下記化学式（２）

（化学式（２）中、Ｒ ^４ 、Ｒ ^５ 、及びＲ ^６ は水素原子又はメチル基であり、Ｍは水素原子、ナトリウム、リチウム、及びカリウムから選ばれるアルカリ金属、又はマグネシウム、カルシウム、及びバリウムから選ばれるアルカリ土類金属である。）で表される単量体（２）との共重合体であるポリカルボン酸エーテル、及びこれらの塩から選ばれるカルボン酸系流動化剤との少なくとも何れかである遅延型流動化剤と、
クエン酸、クエン酸ナトリウム、グルコン酸、酒石酸、リンゴ酸、サリチル酸、ｍ－オキシ安息香酸、及びｐ－オキシ安息香酸から選ばれるオキシカルボン酸と、リグニンスルホン酸と、ソルビトール、ペンチトール、及びヘキシトールから選ばれる糖アルコールと、オキシカルボン酸及び／又はリグニンスルホン酸のリチウム塩、カリウム塩、及びナトリウム塩から選ばれるそのアルカリ金属塩、そのマグネシウム塩、及びそのカルシウム塩から選ばれるアルカリ土類金属塩との少なくとも何れかである凝結時間調整剤と、
ＪＩＳ Ｇ５９０１（２０１６）に準拠した粒度区分を４～８号としている細骨材と
を含んでいる。 The anchor element fixing method of the present invention, which has been devised to achieve the above object, provides a bag body containing a hydraulic composition, and a top side portion of the bag body that communicates with the outside world and the inner space of the bag body. from the port with the scaly ring through a connecting tube attached to the bottle containing the water and connected to a connector with the scaly ring , or to the bottle containing the water. A step of liquid-tightly introducing the water from the port through a water injection nozzle having a taper, attaching the hydraulic composition and a cap that does not leak the water to the port, and applying an external force to the pack, A step of mixing the hydraulic composition and the water to prepare a hardening paste, and after removing the cap, crushing the bag body to push out the hardening paste from the port and form a concrete skeleton. and inserting an anchor element into the drilled hole while penetrating the curable paste to cure the curable paste ,
The hydraulic composition is
a hydraulic component containing Portland cement, alumina cement, and a quick setting agent;
a strength enhancer comprising fine silica particles and/or kaolin;
A sulfonic acid-based fluidizing agent selected from naphthalenesulfonic acid formalin condensates, melamine sulfonic acid formalin condensates, aromatic sulfonic acid formalin condensates, polystyrene sulfonic acid, and salts thereof, polycarboxylic acid, and the following chemical formula (1):

(In chemical formula (1), R ¹ is a hydrogen atom or a methyl group, R ² is an alkylene group having 2 to 4 carbon atoms, R ³ is an alkyl group having 2 to 5 carbon atoms, and n is 1 to is a positive number of 100) and a monomer represented by the following chemical formula (2)

(In the chemical formula (2), R ⁴ , R ⁵ and R ⁶ are a hydrogen atom or a methyl group, M is a hydrogen atom, an alkali metal selected from sodium, lithium and potassium, or from magnesium, calcium and barium at least one of a polycarboxylic acid ether which is a copolymer with the monomer (2) represented by the selected alkaline earth metal, and a carboxylic fluidizing agent selected from salts thereof. a delayed superplasticizer that is
oxycarboxylic acids selected from citric acid, sodium citrate, gluconic acid, tartaric acid, malic acid, salicylic acid, m-oxybenzoic acid and p-oxybenzoic acid, ligninsulfonic acid, sorbitol, pentitol and hexitol a sugar alcohol selected, and an alkaline earth metal salt selected from alkali metal salts thereof, magnesium salts thereof, and calcium salts thereof selected from lithium salts, potassium salts, and sodium salts of oxycarboxylic acids and/or lignosulfonic acids; a setting time modifier that is at least one of
Fine aggregate with a particle size classification of 4 to 8 in accordance with JIS G5901 (2016)
contains .

In the anchor element fixing method, the external force may be the pressing force of an instrument and/or human power.

In the anchor element fixing method, the instrument has a cylindrical rotating body that presses the pack with its side surface and a rotating shaft that penetrates the central axis of the rotating body and supports it. It may be a pressure roller that is

The anchor element fixing method includes, for example, a method in which the human force is the force of stepping on, the force of kneading, and/or the force of shaking the pack.

An anchor element fixing method includes, for example, pressing the pack immediately after the step of adding water to discharge the air in the pack from the port.

In the anchor element fixing method, a nozzle having an injection tube with an injection amount indication mark attached to the tip thereof is attached to the port, and the injection tube is inserted into the drilled hole to inject the hardening paste. The pack may be moved in a direction in which the injection tube is removed from the drilled hole, and the injection of the hardening paste is completed when the injection amount indication mark appears and disappears from the drilled hole.

In the anchor element fixing method, the bag may contain a maximum of 3000 g of the hydraulic composition.

The anchor element fixing method includes, for example, adding 25 to 37 parts by mass of the water to 100 parts by mass of the hydraulic composition.

In the anchor element fixing method , the hydraulic composition comprises a hydraulic component containing portland cement, alumina cement, and a quick setting agent, a strength enhancer, a retarding fluidizer, a setting time adjuster, and JIS It contains fine aggregate with a particle size classification of No. 4 to No. 8 in accordance with G5901 (2016).

In the anchor element fixing method , the hydraulic composition contains 20 to 50 parts by mass of the portland cement, 30 to 60 parts by mass of the alumina cement, 10 to 40 parts by mass of the quick setting agent, and 1 to 40 parts by mass of the strength enhancer. 10 parts by mass, 0.1 to 2 parts by mass of the retarding fluidizing agent, 1 to 10 parts by mass of the setting time adjusting agent, and 10 to 40 parts by mass of the fine aggregate. .

In the anchor element fixing method , for example, the delayed fluidizing agent contains a sulfonic acid fluidizing agent and/or a carboxylic acid fluidizing agent.

In the anchor element fixing method , the strength enhancer may contain silica fine particles and/or kaolin.
In the anchor element fixing method, for example, the delayed fluidizing agent is the carboxylic fluidizing agent that is the polycarboxylic ether, and the polycarboxylic ether is the monomer (1): 10 to 95% by mass: 5 to 90% by mass of the polymer (2).
In the anchor element fixing method, for example, the retarding fluidizing agent comprises the monomer (1), polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, polybutylene glycol mono(meth)acrylate, methoxypolyethylene glycol mono(meth)acrylate, ethoxypolyethylene glycol mono(meth)acrylate, methoxypolypropylene glycol mono(meth)acrylate, ethoxypolypropylene glycol mono(meth)acrylate, methoxypolybutylene glycol mono(meth)acrylate, and ethoxypolybutylene At least one selected from glycol mono(meth)acrylate, and the monomer (2) is at least one selected from acrylic acid, methacrylic acid, crotonic acid, and metal salts thereof.

As for the anchor element fixing method , for example, the silica fine particles are silica fume.

The hydraulic composition used in the anchor element fixing method includes a hydraulic component containing Portland cement, alumina cement, and a quick setting agent, a strength enhancer, a retarded fluidizer, a setting time adjuster, and JIS It contains fine aggregate with a particle size classification of No. 4 to No. 8 in accordance with G5901 (2016).

According to the anchor element fixing method of the present invention, since water is not stored in the pack in advance and the required amount is put into the pack at the time of use, it is not necessary to separate the water and the hydraulic composition with a partition. The structure of the pack can be simplified, and the problem of contact between the two due to the separation or loosening of the partition during transportation or storage does not occur. In addition, since it is not necessary to handle the pack carefully so as not to remove the partition, the pack can be easily transported and stored. Furthermore, without considering the load bearing capacity of the partition, an appropriate amount of curable paste can be prepared by storing an amount of the hydraulic composition in a pack according to the construction scale from small to medium scale.

In the anchor element fixing method, if the device for applying the external force is a pressing roller having a rotating body and a rotating shaft, the operator can grip the rotating shaft and reciprocate the pressing roller on the bag body to form the hydraulic composition. and water can be mixed and kneaded, so that a curable paste can be quickly prepared without requiring special procedures and without depending on the skill level of the operator. Further, according to the anchor element fixing method, the hydraulic composition and water can be mixed by a very simple method such as stepping on, kneading, or shaking the pack.

In the anchor element fixing method, if the injection tube with the injection amount indication mark is used, the worker can inject the hardening paste while moving the pack in the direction of removing the injection tube from the hole drilled in the concrete frame. Then, a specified amount of curable paste can be injected into the drilled hole without excess or deficiency by a simple operation of completing the injection when the injection amount indication mark appears and disappears from the opening of the drilled hole. Accordingly, in the process of inserting the anchor element into the drilled hole into which the hardening paste is injected, an excessive amount of the hardening paste does not overflow from the opening of the drilling, which is economical and reduces waste. In addition, since there is no shortage of the curable paste to be injected, and there is no need to additionally inject the insufficient amount of the curable paste in the subsequent process, the work of fixing the anchor elements can be carried out quickly.

According to the hydraulic composition used in the anchor element fixing method, it is possible to prepare a curable paste having high fluidity, so that the anchor element can be placed in the drilled hole into which the curable paste is injected without using a driving tool. Can be driven by hand. In addition, since the curable paste can be injected one after another into many drilled holes in an assembly line operation, it is possible to perform construction at many locations in a short time.

If the hydraulic composition contains silica fine particles or kaolin rich in pozzolanic activity as a strength enhancer, dense hydrate crystals are formed after the start of setting, so that a hardened body having extremely high compressive strength can be obtained. can be done.

FIG. 4 is a perspective view illustrating the first half of the anchor element fixing method to which the present invention is applied; FIG. 10 is a perspective view illustrating another aspect of the step of adding water to the pack during the first half of the anchor element fixing method to which the present invention is applied; FIG. 10 is a perspective view illustrating another aspect of the step of adding water to the pack during the first half of the anchor element fixing method to which the present invention is applied; FIG. 4 is a schematic partial cross-sectional side view for explaining the latter half of the anchor element fixing method to which the present invention is applied;

Modes for carrying out the present invention will be described in detail below, but the scope of the present invention is not limited to these modes.

An example of the anchor element fixing method of the present invention will be described with reference to FIGS. FIG. 1 shows the first half of the anchor element fixing method. As shown in FIG. 1(a), the pack 10 used in the anchor element fixing method has a welding band 11a in which rectangular films with rounded corners are welded together in a band shape with a constant width at their peripheral edges. and a port 12 fixed by welding together with the welding band 11a at the _upper edge portion 11a1 of the bag 11. As shown in FIG. The port 12 has a cylindrical shape and communicates the inner space of the bag body 11 with the outside world. A male thread is provided on the outer surface of the upper portion of the port 12 to engage with a female thread formed on the inner surface of the cap 13 (see FIG. 1(b)). The bag body 11 contains _only the hydraulic composition C1, which is a powder, as the content. The hydraulic composition C1 changes into a curable paste upon contact with water W, and undergoes _a hydration reaction to harden to form a hardened body.

In the bag body 11 , the length of the upper end side portion 11 a ₁ having the port 12 and the lower end side portion 11 a ₃ opposed thereto is preferably shorter than the length of the side portion 11 a ₂ of the bag body 11 . Specifically, regarding the outer dimensions of the bag body 11, the length (horizontal length) of the upper edge portion 11a ₁ and the lower edge portion 11a ₃ is preferably 100 to 300 mm, more preferably 100 to 250 mm. More preferably, it is still more preferably 100 to 200 mm. The length (vertical length) of the side portion 11a ₂ is preferably 200 to 500 mm, preferably 250 to 500 mm, more preferably 250 to 400 mm, and more preferably 300 to 400 mm. It is even more preferable to have The outer dimensions of the bag 11 are determined within these ranges according to the amount (mass and volume) of the hydraulic composition C1 to be accommodated and the amount (mass and volume) of the water W to be injected into the bag ₁₁ . be done.

Further, the mass of the hydraulic composition C1 accommodated in the bag ₁₁ is 100-3000 g. The storage capacity may be within this range, and can be appropriately selected from, for example, 500 g, 1000 g, 1500 g, 2000 g, and 2500 g, depending on the number of construction sites and the thickness and length of the anchor element to be fixed. When the mass of the hydraulic composition C1 contained in the bag body 11 exceeds 3000 g, as described later, _a curable paste _C2 prepared by adding water W to the hydraulic composition C1 (Fig. ₁ (d)) becomes too heavy, and the operability by hand deteriorates.

_First , while supporting the upper edge portion 11a1 of the bag body 11 with the right hand 31, the pack 10 is placed on a suitable flat stand (not shown) so that the pack 10 stands upright. The cap 13 (see FIG. 1(b)) screwed onto and covering the port 12 is removed. Next, a tube of a funnel 21 having a conical portion 21a which gradually narrows downward and a pipe portion 21b which is connected to the top of the conical portion 21a and whose diameter gradually decreases downward. Portion 21b is inserted into port 12 from its lower tip. The tube portion 21b has a gentle taper toward its lower tip, and the outer diameter of its lower tip is slightly smaller than the opening diameter of the port 12 and its intermediate outer diameter. is larger than the opening diameter of port 12 . Therefore, the tube portion 21b of the funnel 21 is fitted with the port 12 so that the funnel 21 does not come off from the port 12.例文帳に追加

While supporting the pack 10 with the right hand 31 so that the pack 10 stands upright on the flat table, the left hand 32 holds a beaker 41 filled with water W. A predetermined amount of water W corresponding to the mass of the hydraulic composition C1 is pre _- weighed into the beaker 41 . The operator slowly tilts the beaker 41 and pours the water W into the conical portion 21 a of the funnel 21 . Thereby, the water W flows into the bag body 11 . Water W reaches the hydraulic composition C1 along the inner surface of the bag ₁₁ and is absorbed therein. The operator puts the entire amount of water W in the beaker 41 into the bag 11 . Thereby, _a prescribed amount of water W is absorbed into the hydraulic composition C1.

The amount of water W per 100 parts by mass of the hydraulic composition C ₁ is preferably 20 to 37 parts by mass, more preferably 25 to 35 parts by mass, even more preferably 25 to 30 parts by mass. preferable. If the amount of water W is less than this lower limit, the amount of water W is insufficient to prepare a homogeneous curable paste C ₂ , and the cured body C ₃ having the desired strength (see FIG. 4(f) ) is not obtained. On the other hand, if the amount of water W exceeds this upper limit, it is difficult to harden the hardening paste _{C2 ,} and the hardened body C3 having the necessary strength cannot be formed. The temperature of water is preferably 5 to 40°C, more preferably 10 to 20°C.

The funnel 21 is then removed from the port 12 and the cap 13 is screwed onto the port 12 as shown in FIG. 1(b). As a result, the cap 13 covers and closes the opening of the port 12 in a liquid _- tight manner, so that the hydraulic composition C1 and the water W in the bag 11 do not leak. The operator grips the pack 10 with both hands 31 and 32 and rubs the bag body 11. - 特許庁As a result, the bag body ₁₁ is deformed, and the hydraulic composition C1 and the water W are premixed. At this time, if necessary, the pack 10 is turned upside down so that the upper end side portion 11a1 faces downward and the lower end side portion _11a3 faces upward _, or the pack 10 is reciprocated so as to be shaken horizontally or vertically, The bag body 11 may be folded. The air _A may occupy a part of the volume of the inner space of the bag body 11 together with the hydraulic composition C1 and the water W. In this step, it is not necessary to knead the bag body 11 with such a strong force that the water W injected from above the hydraulic composition C1 reaches the vicinity of the lower edge portion _11a3 for _a long time. In addition to being able to sufficiently mix them later using a pressing instrument, the burden on the operator increases, and there is _a risk that the mixture of the hydraulic composition C1 and water W will reach the beginning of condensation and start hardening. is.

As shown in FIG. 1(c), the pack 10 is supported by the right hand 31 so that the pack 10 stands upright on the flat table. The bag body 11 is deformed by loosening the cap 13 with the left hand 32 and gripping or pushing the bag body 11 with the right hand 31. - 特許庁As a result, at least a part of the inner surface of the bag 11 comes into surface contact, and the air A inside the bag 11 is discharged from the port 12 . At this time, the air A can be quickly discharged by holding the air retention portion above the bag body 11 with the right hand 31 and sliding the right hand 31 toward the _upper end side portion 11a1. When most of the air A has been expelled, the operator tightens the cap 13 again.

FIG. 1(d) shows the process of preparing the curable paste _C2 by pressing the pack 10 with a pressing tool. The pressing device shown in the figure is a pressing roller 50 having a cylindrical rotating body 51 and a rod-like rotating shaft 52 . The rotating body 51 has two congruent circular bottom surfaces 51a ₁ and 51a ₂ facing each other in parallel, and a side surface 51b connecting the circumferences of the bottom surfaces 51a ₁ and 51a ₂ . The rotating shaft 52 passes through the central axis of the rotating body 51 and supports the rotating body 51 rotatably. The rotating shaft 52 protrudes from both bottom surfaces 51a ₁ and 51a ₂ of the rotating body 51, respectively. A protruding portion of the rotating shaft 52 is a grip 52 a that can be grasped by an operator to operate the pressure roller 50 .

The pack 10 is placed on a suitable flat table with the port 12 oriented horizontally, and the pressure roller 50 is placed on the bag body 11 so that the side surface 51b of the rotor 51 and the outer surface of the pack 10 are in contact with each other. put it on The pressing roller 50 is supported by grasping the grips 52a protruding from the bottom surfaces 51a ₁ and 51a ₂ of the rotor 51 with the right hand 31 and the left hand 32, respectively. While pressing the grip 52a toward the flat base, the rotating shaft 52 is alternately moved in _one direction of the upper end side portion 11a and in _three directions of the lower end side portion 11a. As indicated by the two-dot chain line arrow in FIG. 1(d), the rotating body 51 follows this movement and reciprocates on the bag body 11 while rotating. Alternatively, the pressing roller 50 may be alternately moved in the direction of the upper edge portion 11a and the direction of the _lower edge portion 11a while reciprocating between the _one side portion _11a2 and the other side portion _11a2 . , on the diagonal of the bag 11 . By moving the pressing roller 50 in this way, it is possible to apply a pressing force in the horizontal direction to the inside of the bag body 11 in addition to the pressing force in the flat base direction (vertical direction). Thereby, the hydraulic composition C1 and the water W can be randomly circulated in the bag ₁₁ and stirred.

The movement of the pressing roller 50 depends on the volume of the hydraulic composition C1 and water W and the size of the bag body 11, but is preferably ₁ to 5 seconds/reciprocation, and may be 2 to 4 seconds/reciprocation. More preferably, 2 to 3 seconds/reciprocation is even more preferable. Further, the mixing and stirring process by the pressing roller 50 is preferably performed for 20 to 60 seconds, more preferably for 20 to 50 seconds, and even more preferably for 30 to 50 seconds.

At this time, the hydraulic composition C ₁ and the water W are mixed and stirred by the movement of the rotating body 51 and the pressing force, and flow so as to circulate within the pack 10 . As _a result, it is difficult for the hydraulic composition C1 to flow or for the water W to reach the corners of the bag body 11 (connections between the upper and lower side portions 11a ₁ and 11a ₃ and the side portion 11a ₂ ). Move to a place where it is difficult. As _a result, the hydraulic composition C1 and the water W do not stay at the corners of the bag body 11 and always flow during the mixing/stirring process using the pressure rollers 50 . As _a result, the curable composition C1 and the water W can be uniformly and uniformly mixed, so that a curable paste in which they are not unevenly distributed can be prepared.

In the preparation process of this curable paste, the pressing roller 50 is composed of only two parts, the rotating body 51 and the rotating shaft 52, so that it is easy to manufacture and inexpensive, and its operation method is simple, and power consumption is reduced. This eliminates the need for a vibration generating device that requires a power source such as the above and that requires an expensive and complicated operation. Furthermore, according to the curable paste preparation process using this pressing roller ₅₀ , the hydraulic composition C1 and the water W can be mixed by simply performing a simple operation of reciprocating the pressing roller 50 while pressing it against the pack 10. Homogeneous curable pastes can be conveniently prepared without relying on operator skill for mixing and kneading.

Before the curable paste preparation step shown in FIG. 1(d), the air remaining in the pack 10 causes the rotating body 51 to rotate due to the air discharging step shown in FIG. 1(c). Also, the bag 11 is prevented from tearing due to friction between wrinkles in the film forming the bag 11 and the rotating body 51 .

To prepare the curable paste _C2 , the curable paste _C2 may be agitated inside the bag body 11 by applying an external force such as stepping on, kneading, or shaking the pack 10. FIG. When using these methods, a part of the human body, such as hands, elbows, knees, and feet, may be brought into contact with or gripped by the pack 10 to apply pressure or shaking to the pack 10. The curable paste _C2 can be stirred by. The time for which manual force is applied is preferably 30 to 120 seconds, more preferably 30 to 90 seconds, and even more preferably 30 to 60 seconds. The external force applied to the pack 10 in the process of preparing the curable paste may be either one or both of the pressing force of the pressing roller 50 and human power. When using both of them, the order is not particularly limited.

The bag 11 is permeable to water so that the hydraulic composition C1 accommodated therein does not suddenly become _a paste and harden due to contact with water in the outside world, and is not broken due to friction with the rotating body 51. It is preferably formed of a film that is difficult to remove and has high strength. The thickness of this film is preferably 100-250 μm, more preferably 100-180 μm, and even more preferably 100-150 μm. Moreover, the film is preferably transparent or translucent so that the hydraulic composition C ₁ , the curable paste C ₂ , and the water W in the bag 11 can be visually recognized through the bag 11 .

Also, the film is preferably soft and flexible. Materials for this film include thermoplastic resins, and specific examples include polyethylene, polypropylene, polybutene, poly-4-methylpentene-1, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyvinyl acetate, and polymethacrylic acid. A homopolymer containing at least one of the group consisting of methyl, polyethyl methacrylate, polyacrylic acid, cyclic polyolefin, polyacrylonitrile, polyamide (nylon), polyester, polyurethane, polycarbonate, polyimide, polyphenylene sulfide, and polyvinyl chloride, and /or copolymers and/or polymer blends.

The structure of the film may be a single layer formed of one of the thermoplastic resins described above, or may be a multi-layer structure in which a plurality of films formed of the same or different thermoplastic resins are adhered. When the film has a multilayer structure, for example, polyamide (nylon) layer (PA; 15 μm thick)/barrier polyamide (nylon) layer (barrier PA; 15 μm thick)/linear low-density polyethylene is arranged from the inner layer to the outer layer. A multilayer structure in which layers (LLDPE; 130 μm thick) are laminated in order can be mentioned. This multilayer structure consists of a polyethylene terephthalate layer (PET; 12 µm thick)/a barrier polyamide (nylon) layer (barrier PA; 15 µm thick)/a linear low-density polyethylene layer (LLDPE; 130 µm thick) in order from the inner layer to the outer layer. may be In particular, the outermost LLDPE layer preferably has a thickness of at least 100 μm. As a result, even if the internal pressure of the bag body 11 rises due to the friction with the pressure roller 50 or the foot or the pressure from them, the film does not tear or tear. On the other hand, when the thickness of the LLDPE layer exceeds 150 μm, the film is difficult to deform due to external pressure, so that the hydraulic composition C1 and water W cannot be sufficiently mixed and kneaded, and _a homogeneous curable paste _C2 is obtained. can't The weld zone 11a can also be formed by thermal welding, ultrasonic welding, or induction welding.

The above thermosetting resin can also be used as a material for the port 12 , the rotating body 51 and the rotating shaft 52 . The grip 52a may be covered with a sponge made of the above material so that the operator can easily grip it.

Another aspect of the water W injection step shown in FIG. 1(a) is shown in FIG. First, as shown in FIG. 2(a), a connector 22 is prepared. The connector 22 is cylindrical and has a circular opening at its upper end. The connector 22 has a female thread on the inner wall surface of the base end that can be screwed into the male thread of the port 12, and has a plurality of scale-like rings 22a on the outer surface of the middle to the tip. Each scaly ring 22a is formed concentrically with the circular opening and has a truncated shape that gradually widens toward the proximal end. Thereby, a plurality of steps are formed on the outer surface of the connector 22 . A connector having such an outer shape is called a bamboo shoot. This connector 22 is screwed into the port 12 and attached.

Then, one end of the connection tube 23 is fitted to the connector 22 as shown in FIG. 2(b). Since the connector 22 has a plurality of steps due to the scaly ring portion 22a, the connection tube 23 once fitted to the connector 22 does not come off easily.

As shown in FIG. 2(c), another connector 22 is screwed into the mouth 42a of the bottle 42, and the other end of the connection tube 23 is fitted there. Thereby, the pack 10 and the bottle 42 are liquid-tightly connected via the connecting tube 23 . _A bottle 42 contains a defined amount of water W corresponding to the mass of the hydraulic composition C1. As the bottle 42 containing the water W, for example, Eizer Pure Water (250 mL, manufactured by Axis Co., Ltd., trade name) is commercially available. While supporting the pack 10 with the right hand 31, the operator holds the bottle 42 with the left hand 32 and tilts the bottle 42 so that the mouth 42a faces downward. Thereby, the water W in the bottle 42 is poured into the bag body 11 through the connection tube 23 .

FIG. 3 shows still another aspect of the step of injecting water W shown in FIG. 1(a). First, as shown in FIG. 3(a), the water injection nozzle 24 is prepared. The water injection nozzle 24 is gradually reduced in diameter from the proximal end toward the distal end. As a result, the water injection nozzle 24 forms a tapered truncated cone-shaped cylindrical body. The water injection nozzle 24 has a female thread formed on the inner wall surface of the base end thereof to be screwed with a male thread formed on the outer surface of the mouth 42 a of the bottle 42 . The water injection nozzle 24 is attached to the bottle 42 in a liquid-tight manner by screwing the base end of the water injection nozzle 24 into the cylinder mouth 42a. As such a water injection nozzle 24, for example, an automatic water supply nozzle 3P (model MYS024) manufactured by Sanada Seiko Co., Ltd. is commercially available. If necessary, the tip of this automatic water supply nozzle 3P may be cut off. As a result, the tip opening of the water injection nozzle 24 is expanded in diameter, so that the water W in the bottle 42 can be injected into the pack 10 in a short period of time (see FIG. 3(c)).

Next, as shown in FIG. 3(b), the opening of the port 12 is pinched so that the opening faces slightly downward, and the bag body 11 is folded. A water injection nozzle 24 is inserted into the opening of the port 12 from its tip. Since the water injection nozzle 24 has a taper, it bites into the opening of the port 12 and fits therewith so that it does not fall off easily. Thereby, the pack 10 and the bottle 42 can be connected in a liquid-tight manner. By bending the bag 11 and directing the opening of the port 12 downward in this way, the hydraulic composition C1 does not leak from the bag ₁₁ . Further, unless the tip of the water injection nozzle 24 is positioned above the bottom of the bottle 42, the water injection nozzle 24 cannot be inserted into the port 12. Do not leak from the opening.

As shown in FIG. 3(c), the bottle 42 is turned upside down so that the bottom of the bottle 42 faces upward and the water injection nozzle 24 faces downward. Thereby, the water W in the bottle 42 is poured into the bag body 11 through the water injection nozzle 24 .

According to the embodiment shown in FIGS. 2 and 3, the pack 10 and the bottle 42 are liquid-tightly connected via the connection tube 23 and the water injection nozzle 24, so that the prescribed amount of water W weighed in advance is completely spilled. It can be poured into the bag body 11 reliably and simply without any need.

FIG. 4 shows the latter half of the anchor element fixing method of the present invention. The figure shows the process of attaching the supports that fix the rockfall protection net to the concrete.

The concrete covering 61 shown in FIG. 4A is formed by concrete covering to the slope 62 and covers the slope 62 with a substantially uniform thickness. Therefore, the surface 61a of the upholstered concrete 61 is inclined. An operator sets the core boring machine 71 on the surface 61a, rotates the core drill 71a attached to the tip of the machine, and forms 20 to 30 cylindrical holes 61b.

The depth (length) and diameter of the drilled hole 61b are determined according to the thickness of the concrete upholstery 61 and the length and diameter of the anchor element to be anchored. In particular, the depth of the drilled hole 61b is preferably at least 5-10 times the diameter of the anchoring element. For example, when the anchor element is a D25 reinforcing bar (name of deformed bar steel specified in JIS G3112 (2010): nominal diameter 25.4 mm), the depth of the drilled hole 61b is 125 to 250 mm, specifically 175 to 200 mm, More specifically, drilled holes 61b having a diameter of 175 to 180 mm and a diameter of 30 to 38 mm, specifically 30 to 35 mm, and even more specifically 30 to 33 mm can be mentioned.

As shown in FIG. 4(b), a nozzle 14 is attached to the port 12 of the pack 10 by screwing. The nozzle 14 has the same internal thread as the cap 13 at its proximal end, and a discharge port opened at its distal end. The nozzle 14 gradually narrows toward the tip. An injection tube 15 is connected to this tip. Injection tube 15 is clamped and secured to nozzle 14 by fastener 16 . Around the middle of the injection tube 15, a vinyl tape, which is an injection amount instruction mark 15a, is wound and attached. This injection amount indication mark 15a is removed when the hardening paste _C2 is injected into the drilled hole 61b in an amount that satisfies the difference between the volume of the drilled hole 61b and the volume of the insertion portion of the anchor element to be inserted therein. It is attached at a position exposed from the opening of the hole 61b (see FIG. 4(d)).

As shown in FIG. 4B, the operator inserts the injection tube 15 into the drilled hole 61b until the tip of the injection tube 15 contacts the bottom surface _61b1 of the drilled hole 61b. Next, as shown in FIG. 1(c), the operator grips the bag body 11 with, for example, the left hand 32, and presses both surfaces of the bag body 11 in opposite directions so that the inner surfaces of the bag body 11 come into contact with each other. to compress. As a result, the curable paste _C2 in the bag body 11 is discharged from the injection tube 15 and flows into the drilled hole 61b. At this time, it is preferable to discharge the curable paste _C2 from the lower edge portion _11a3 toward the nozzle 14 while handling it with hands 31 and 32. FIG. Also, by gradually winding up the bag 11 with hands 31 and 32 from the lower end side portion 11 a ₃ toward the port 12 , pressure is applied to the curable paste C ₂ in the bag 11 to release the nozzle 14 and injection tube 15 from the nozzle 14 and the injection tube 15 . This may be discharged.

As shown in FIG. 1(c), the operator gradually moves the pack 10 in the direction X away from the opening of the drilled hole 61b while injecting the curable paste _C2 into the drilled hole 61b. At this time, the operator continues to inject the curable paste _C2 while keeping the tip of the injection tube 15 in contact with the liquid surface of the curable paste _C2 . As a result, the injection tube 15 moves in the direction of being removed from the drilled hole 61b as the injection amount of the curable paste _C2 increases in the drilled hole 61b. Also, the operator can sense the pressure of the curable paste _C2 generated when the liquid surface of the curable paste _C2 moves toward the opening of the drill hole 61b. The operator can thereby recognize the successful injection of the curable paste _C2 .

When the operator continues this work, as shown in FIG. 4(d), the injection amount indication mark 15a appears and disappears at the opening of the drilled hole 61b. When the operator visually confirms that the injection amount indication mark 15a appears and disappears at the opening of the drilled hole 61b, the operator finishes the injection work of the curable paste _C2 into one drilled hole 61b. As described above, in the process of injecting the curable paste _C2 , the operator can easily and simply perform a simple task of observing the opening of the drilled hole 61b while moving the pack 10. The injection of the curable paste _C2 can be finished leaving only the volume of the part to be inserted in the drilling hole 61b. As a result, when the anchor element is inserted into the drilled hole 61b, it is possible to prevent a large amount of curable paste _C2 from overflowing from the opening of the drilled hole 61b.

FIG. 4(e) shows the step of implanting the anchor element. Anchor bolt 81, which is an anchor element, has a long, substantially cylindrical shape, and has a base end (see FIG. 1(f)) forming a plane substantially perpendicular to the central axis of the anchor bolt 81, and the base end and a tip having an elliptical face by being inclined with respect to the face of the tip. As a result, since the tip of the anchor bolt 81 is sharply pointed, it can be easily inserted into the drilled hole 61b filled with the hardening paste _C2 . A plurality of ribs 81a protrude from the tip of the anchor bolt 81 to the middle. A male thread 81 b is provided on the surface of the proximal end of the anchor bolt 81 . A nut 83 for fixing the pillar of the rockfall protection net is screwed to the male screw 81b (see FIG. 4(f)). The overall length of the anchor bolt 81 satisfies the fixing length of the anchor bolt shown in the standard, and the drilled hole 61b is drilled so that the male screw 81b protrudes from the opening of the drilled hole 61b when driven into the drilled hole 61b. Longer than the hole length (depth). The tip of the anchor bolt 81 may not be sharp, and may be a so-called cut product having a substantially circular end face.

The dimensions of the anchor bolt 81 are not particularly limited, but, for example, deformed bar steel designations D4 to D51 defined in JIS G3112 (2010) can be used. Also, the anchor bolt 81 may be a fully threaded bolt having a nominal diameter of M6 to M100.

The operator grips the proximal end of the anchor bolt 81 with the right hand 31 (or the left hand 32, or both hands) and rotates the anchor bolt 81 around the central axis so as not to mix air into the curable paste _C2 . Insert the curable paste _C2 in the drilled hole 61b. Due to the curable paste _C2 having moderate fluidity and the sharp tip of the anchor bolt 81, the operator can remove the anchor bolt 81 filled with the curable paste _C2 without much force. The holes 61b can be driven. The operator performs this step within the pot life, which is the time from the completion of preparation of the curable paste _C2 to the start of setting of the curable paste _C2 . When the pot life elapses, the fluidity of the hardening paste _C2 , which has reached the beginning of setting, is gradually lost, and the driving resistance of the anchor bolt 81 increases. ), it becomes difficult to drive by human power.

The operator supports the anchor bolt 81 with the hands 31 and 32 so as to form a predetermined angle within the drilled hole 61b. Since the curable paste _C2 that has reached the end of setting begins to harden, the anchor bolt 81 is fixed in the drilled hole 61b while maintaining a predetermined angle without requiring support by the operator. If necessary, the operator removes the curable paste _C2 slightly overflowing from the drilled hole 61b. The worker continues to move to another drilled hole 61b and repeats the operations of FIGS. 4(b) to (e).

Since the pack 10 contains a sufficient amount of curable paste _C2 prepared from ₁₀₀ to 3000 g of the hydraulic composition C1, the operator can use a separate pack 10 to add new curable paste one by one. No _C2 preparative work is required. Therefore, this anchor element fixing method can perform the injection work of the curable paste _C2 and the work of inserting the anchor elements without interruption in a medium-scale construction such as fixing the anchor elements in several dozen drilled holes 61b. Since it can be performed as a continuous assembly line work, it is possible to reduce the burden on the worker and contribute to shortening the work time.

FIG. 4(f) shows the stretched concrete 61 that has undergone the steps shown in FIGS. 4(a) to 4(e). A hardened body C3 produced by hardening the hardening paste _C2 closes the opening of the _drilled hole 61b and is densely filled between the inner wall surface of the drilled hole 61b and the anchor bolt 81. As shown in FIG. The anchor bolt 81 is fixed to the tension concrete 61, and the post 82 is fixed by screwing a nut 83 onto the male screw 81b at the base end of the anchor bolt 81. Due to the anchor effect of the ribs 81a, the anchor bolts 81 improve the pull _- out strength from the hardened body C3.

_The hydraulic composition C1 housed in the bag 11 will be described.

The hydraulic composition C1 comprises _a hydraulic component containing portland cement, alumina cement, and a quick setting agent, fine aggregate, a retarding fluidizer, a strength enhancer, and a setting time adjuster. contains.

The fine aggregate reduces the shrinkage that occurs when the curable paste _C2 hardens after setting _, and prevents the occurrence of cracks in the hardened paste C3. In addition, the heat generated due to the hydration reaction of the hydraulic component is alleviated, and the temperature rise of the curable paste _C2 is suppressed to prevent an excessive increase in fluidity and an extension of the setting time. At least one selected from sands such as silica sand, river sand, sea sand, and crushed sand; inorganic materials such as alumina clinker, silica powder, and limestone; crushed urethane, EVA (ethylene vinyl acetate) foam, and pulverized resin foam. Among them, silica sand is preferable.

The fine aggregate preferably does not contain coarse particles of 1 mm or more. Specifically, the particle size classification according to Table 3 of JIS G5901 (2016) is preferably No. 4 to 8, more preferably No. 5.5 to No. 8, and No. 7 to 8. More preferred. Coarse particles of 1 mm or more can be excluded because the particle size division of the fine aggregate is within this range. The specific particle size distribution in this particle size division is 600 to 1180 μm for No. 4, 425 to 850 μm for No. 4.5, 300 to 600 μm for No. 5, 212 to 425 μm for No. 5.5, and 150 to 300 μm for No. 6. , 106 to 212 μm for No. 6.5, 75 to 150 μm for No. 7, 53 to 106 μm for No. 7.5, and 38 to 75 μm for No. 8.

The particle size division is determined by mesh screens with three nominal openings. The mass ratio of the fine aggregate on the surface of each mesh sieve to the total mass of the fine aggregate measurement sample is preferably 70% by mass or more, more preferably 80% by mass or more, and 90% by mass or more. More preferably.

The fine aggregate is contained in the hydraulic composition C ₁ in an amount of 10 to 40 parts by mass, preferably 10 to 30 parts by mass, more preferably 20 to 30 parts by mass. _The fine aggregate content in this range has a lower limit of 8 to 38% by mass, preferably 8 to 25% by mass, and an upper limit of 27 to 67% by mass, preferably is 27 to 33% by mass. In this way, the fine aggregate is fine grains with a particle size of less than 1.2 mm and has a low content of 67% by mass at the maximum in the hydraulic composition C ₁ , so that the hydraulic composition C ₁ Aggregation is not inhibited. If the particle size, content, and percentage of fine aggregate exceed the above upper limits, the hydraulic component and fine aggregate will separate during the injection of the hardening paste _C2 into multiple drill holes. However _, the cured body C3 cannot exhibit the desired strength.

The retarding fluidizer improves the fluidity of the curable paste _C2 and delays the time for the curable paste _C2 to start to solidify. Sulfonic acid fluidizers such as naphthalenesulfonic acid formalin condensates, melamine sulfonic acid formalin condensates, aromatic sulfonic acid formalin condensates, polystyrene sulfonic acid, and salts thereof; Carboxylic fluidizers such as carboxylic acids, polycarboxylic acid ethers, and salts thereof may be mentioned. At least one of these can be used as the retarding fluidizer. The retarding fluidizer produces very fine air bubbles in the curable paste _C2 . It is believed that these air bubbles hinder the reaggregation of the hydraulic component and the progress of the hydration reaction in the curable paste _C2 , thereby improving the fluidity and delaying the onset of coagulation. Polycarboxylic acid ethers are particularly preferable as the retarding fluidizing agent.

（化学式（１）中、Ｒ^１は水素原子又はメチル基であり、Ｒ^２は炭素数２～４のアルキレン基であり、Ｒ^３は炭素数２～５のアルキル基であり、ｎは１～１００の正数である。）で表される単量体（１）と、下記化学式（２）

（化学式（２）中、Ｒ^４、Ｒ^５、Ｒ^６及びは水素原子又はメチル基であり、Ｍは水素原子、ナトリウム、リチウム、及びカリウムから選ばれるアルカリ金属、又はマグネシウム、カルシウム、及びバリウムから選ばれるアルカリ土類金属である。）で表される単量体（２）との共重合体、及びこれの塩が挙げられる。ポリカルボン酸エーテルは、単量体（１）と単量体（２）とを（１）：（２）＝１０～９５質量％：５～９０％質量としていることが好ましい。 Specifically, the polycarboxylic acid ether has the following chemical formula (1)

(In chemical formula (1), R ¹ is a hydrogen atom or a methyl group, R ² is an alkylene group having 2 to 4 carbon atoms, R ³ is an alkyl group having 2 to 5 carbon atoms, and n is 1 to It is a positive number of 100.) and a monomer (1) represented by the following chemical formula (2)

(In the chemical formula (2), R ⁴ , R ⁵ , R ⁶ and are a hydrogen atom or a methyl group, M is a hydrogen atom, an alkali metal selected from sodium, lithium and potassium, or from magnesium, calcium and barium the selected alkaline earth metal), and salts thereof. In the polycarboxylic acid ether, it is preferable that the ratio of monomer (1) and monomer (2) is (1):(2) = 10 to 95% by mass: 5 to 90% by mass.

Monomer (1) is an alkoxypolyalkylene glycol compound which is an addition polymer of an aliphatic or alicyclic alcohol compound having an alkyl group having 2 to 5 carbon atoms and an alkylene oxide having 2 to 4 carbon atoms, and ( It is an ester compound with meth)acrylic acid. Specific examples of the monomer (1) include polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, polybutylene glycol mono (meth) acrylate, methoxy polyethylene glycol mono (meth) acrylate, ethoxy polyethylene glycol mono ( meth)acrylates, methoxypolypropylene glycol mono(meth)acrylates, ethoxypolypropylene glycol mono(meth)acrylates, methoxypolybutylene glycol mono(meth)acrylates, and ethoxypolybutylene glycol mono(meth)acrylates, which are one It may be one or a mixture of two or more.

Specific examples of the monomer (2) include acrylic acid, methacrylic acid, crotonic acid, and metal salts thereof, and one or more of these can be used.

The delay-type fluidizing agent is the time from the start of water absorption of the hydraulic composition C1 to the start of setting of the curable paste _C2 , for example, in an atmosphere with a temperature of 20 ° C., water W with _a water temperature of 20 ° C. and the hydraulic composition C When kneading with ₁ , the kneading time is relatively long, such as at least 10 minutes, preferably 15 to 25 minutes, more preferably 15 to 40 minutes. By using a retarding fluidizing agent, the amount of water required to impart the desired fluidity to the hardenable paste _C2 can be reduced as described above.

The hydraulic composition C1 contains 0.1 to 2 parts by mass, preferably 0.1 to _1.5 parts by mass, and more preferably 0.1 to 1.0 parts by mass of the retarding fluidizer. there is If the content of the retarding fluidizing agent is less than the above _lower limit, the curable paste _C2 will not flow sufficiently and will start to set before the anchor element is placed. The resistance to pushing out from the pack 10 increases, and the hardened curable paste _C2 clings to the anchor elements, increasing the insertion resistance of the anchor elements. end up In addition, the filling of the gap between the inner wall of the drilled hole in the concrete frame or stretched concrete and the anchor bolt is inadequate, resulting in a reduction in the pull-out strength of the anchor bolt. On the other hand, if the content of the retarding fluidizing agent exceeds the upper limit, the hydration reaction of the hydraulic component is excessively inhibited, so that the coagulation and hardening of the hardening paste _C2 are excessively delayed, resulting in hardened body C In addition to impairing the early strength of ₃ , the long-term strength is lowered.

The setting time adjuster adjusts the length of the setting time from the beginning of setting when the curable paste _C2 loses its fluidity to the end of setting when it starts to harden. The setting time adjuster adsorbs to the particles of the hydraulic component in the hardening paste _C2 and coats the surface thereof, suppressing contact between the hydraulic component and water. As a result, the hydration reaction of the hydraulic component can be gradually progressed to prevent the curable paste _C2 from flashing. As setting time modifiers, oxycarboxylic acids such as citric acid, gluconic acid, tartaric acid, malic acid, salicylic acid, m-oxybenzoic acid, and p-oxybenzoic acid; ligninsulfonic acid; sorbitol, pentitol, and hexitol. , and one or more of these can be used. The setting time modifiers may be alkali metal salts such as lithium, potassium and sodium salts of oxycarboxylic acids and lignosulfonic acids, and alkaline earth metal salts such as magnesium and calcium salts. Among them, sodium citrate is preferred, and trisodium citrate is more preferred.

The setting time adjusting agent is contained in the hydraulic composition C ₁ in an amount of 1 to 10 parts by weight, preferably 1 to 8 parts by weight, more preferably 1 to 5 parts by weight. If the content exceeds this upper limit, the setting time becomes excessively long, causing separation of, for example, hydraulic components and fine aggregate before reaching the end of setting. On the other hand, if the content is less than the lower limit, the hydration reaction of the hydraulic component will proceed rapidly, and the hardening paste _C2 will immediately reach the end and harden after the beginning of setting _, so that cracks will occur in the hardened material C3. As a result, the pull-out load of the anchor element is reduced.

The hydraulic component of the hydraulic composition C1 is an M _- type expansive cement essentially containing Portland cement, alumina cement, and a quick setting agent. Portland cement is mainly composed of silica (SiO ₂ ) and calcia (CaO), and examples thereof include those containing 20 to 25% by mass of silica and 60 to 70% by mass of calcia. In addition, alumina (Al ₂ O ₃ ), magnesia (MgO), and iron oxide (Fe ₂ O ₃ ) are each contained in an amount of 1 to 6% by mass. These components are present, for example, as calcium silicate, calcium aluminate, and calcium aluminoferrite.

Specific examples of Portland cement include ordinary Portland cement, high-early-strength Portland cement, ultra-early-strength Portland cement, moderate-heat Portland cement, sulfate-resistant Portland cement, and white Portland cement. Among them, early-strength Portland cement is preferable. Only one type of these Portland cements may be used, or a plurality of types may be mixed and used. Portland cement is contained in the hydraulic composition C ₁ in an amount of 20 to 50 parts by weight, preferably 20 to 40 parts by weight, more preferably 20 to 30 parts by weight.

Alumina cement is a special cement containing calcium aluminate (CaO.Al ₂ O ₃ ) as a main component. . The alumina cement is contained in the hydraulic composition C1 in _an amount of 30 to 60 parts by weight, preferably 30 to 50 parts by weight, more preferably 30 to 40 parts by weight.

Portland cement and alumina cement are fine cement powders, and the average particle size thereof is preferably 10 to 50 μm, more preferably 20 to 40 μm, more preferably 20 to A thickness of 30 μm is even more preferable. Note that the average particle size refers to a volume standard distribution according to a laser diffraction/scattering method. As an apparatus for measuring such an average particle size, for example, Shimadzu Laser Diffraction Particle Size Distribution Analyzer SALD-3100-WJA1:V1.00 (manufactured by Shimadzu Corporation) can be mentioned. When the cement powder is such a fine powder, chemical aggregation due to hydration of the cement powder due to water absorption and physical aggregation due to the surface potential of the cement powder are likely to occur. As a result, due to chemical cohesion or physical cohesion, or a synergistic effect of both, the hardening paste C ₂ injected into the drilled hole in the ceiling or wall of the concrete box culvert, for example, leaks from the drilled opening. hard to do

Accelerating agents include sulfate salts such as sodium sulfate, potassium sulfate, aluminum sulfate, and calcium sulfate, and one or more of these can be used. As calcium sulfate, gypsum such as anhydrous gypsum (CaSO ₄ ), hemihydrate gypsum (CaSO ₄ 1/2H ₂ O), and dihydrate gypsum (CaSO ₄ 2H ₂ O) increases the production amount of ettringite described later. It is preferable from the viewpoint of These quick-setting agents may be used singly or in combination. The hydraulic composition C ₁ contains 10 to 40 parts by weight, preferably 20 to 40 parts by weight, and more preferably 20 to 30 parts by weight of the quick-setting agent.

The strength enhancer contains silica fume, which is silica fine particles, and/or kaolin as a main component. Silica fume exhibits a thickening effect of improving the viscosity of the curable paste _C2 and is rich in pozzolanic activity _, which will be described later, so that it can impart high compressive strength to the cured body C3. Silica fume is obtained by collecting with a filter silicon oxide (SiO ₂ ) vaporized during the process of producing ferrosilicon (FeSi) in an electric furnace. Silica fume has an average particle size of 0.1-0.2 μm and a bulk density of 0.3-0.8 g/cm ³ . The strength enhancer is contained in the hydraulic composition C ₁ in an amount of 1 to 10 parts by weight, preferably 1 to 8 parts by weight, more preferably 1 to 5 parts by weight.

Kaolin contains silica and alumina. Kaolin specifically includes calcined kaolin (2SiO ₂ ·Al ₂ O ₃ ). Calcined kaolin is obtained by putting kaolin (2SiO ₂ ·Al ₂ O ₃ · 2H ₂ O), which is a natural clay mineral, into a kiln such as a rotary kiln, and heating it at 700 to 750 ° C for a residence time of 20 to 25 minutes. Obtained by baking. Strength enhancers may include siliceous powders such as blast furnace slag powder and/or fly ash in addition to calcined kaolin.

With the passage of time, the hardening paste _C2 causes a hydration reaction of the hydraulic component to harden, and then hardens. Specifically, the reaction of calcium aluminate, gypsum, and water in alumina cement proceeds to produce ettringite (3CaO.Al ₂ O _{3.3CaSO 4.32H 2 O} ), which is calcium aluminate sulfate hydrate. Further, when the quick-setting gypsum is consumed, ettringite reacts with calcium aluminate (aluminate phase) in the alumina cement to form monosulfate hydrate. Calcium sulfoaluminate hydrates, such as ettringite and monosulfate hydrate, are bulky, water-insoluble needle-like crystals, and as they grow, the hardening paste _C2 expands and solidifies. It hardens gradually. Moreover, gypsum, which is a quick-setting agent, serves as a supply source of calcium sulfate and increases the amount of ettringite produced, forming a high _- strength hardened body C3.

Hardenable paste _{C2 contains calcium hydroxide (Ca(OH)2 )} in which calcia in alumina cement is dissolved in water. Silica fume and kaolin contained in the strength enhancer cause a so-called pozzolanic reaction with this calcium hydroxide to form a water-insoluble hydrate. As a result, for example, fine and dense crystals of calcium silicate hydrate _{( 3CaO.2SiO2.3H2O} ) and calcium aluminate hydrate _{( 3CaO.Al2O3.6H2O} ) _are produced. , to harden the curable paste to high strength. In particular, compared to blast furnace slag, which is pulverized by pulverization, and fly ash, which has a relatively large spherical shape because it is coal ash, the particles of calcined kaolin are fine, so they have a large surface area per unit mass. there is Therefore, silica fume and calcined kaolin have much higher pozzolanic activity than other siliceous powders _, and therefore form dense hydrate crystals and impart higher compressive strength to the hardened body C3.

In this way, the hydraulic composition C1 contains alumina cement _, a quick _- setting agent such as gypsum, and a strength enhancer mainly composed of kaolin, so that the hardened composition C3 thereof is It develops early strength that develops high strength in a few hours to a day.

In parallel with the formation of ettringite and the pozzolanic reaction, the hydration reaction of calcium silicate in Portland cement proceeds to form hardened calcium silicate hydrate C3, such as _tobermorite crystals. As a result, since the hydration reaction of calcium silicate is slower than that of calcium aluminate, Portland cement is excellent in maintaining high strength over a long period of time, for example, seven days to several months after placement. .

Thus, the hydraulic composition C1 contains _portland cement, alumina cement, rapid setting agent, strength enhancer, fine aggregate, setting time adjuster, and retarding fluidizer, and these are By combining with the composition ratio of , it is possible to lengthen the time until the start of condensation and give the worker a sufficient time required for construction. As a result, even an inexperienced worker can reliably perform each step of the anchor element fixing method with a margin.

The compressive strength of the cured body C3 obtained from this hydraulic composition C1 (according to JIS _A1108 (2006)) is 60 to 80 N / mm ² at a curing temperature of 20 to 25 ° C. just _one day after placing. and increases to 100-120 N/mm ² after 28 days. Furthermore, the curable paste C ₂ has a flow-down value of 40 to 90 seconds (based on the JSCE-F 541-2013 filling mortar fluidity test method (J14 funnel test) specified in the Concrete Standard Specifications), and 150 to 280 mm flow test value (based on JIS R5201 (2015)). For this reason, the operator can push out the curable paste _C2 from the pack 10 with hands 31 and 32 without requiring much force, and can push the anchor element into the curable paste only by the force of hands 31 and 32 or arm. You can type into _C2 .

The hydraulic composition C1 may further contain a thickener in addition to a strength enhancer such as silica fine particles that exhibits _a thickening effect. The thickener exhibits a thickening effect like a binder that binds the particles of the hydraulic component together. Furthermore, by imparting an appropriate viscosity to the curable paste _C2 , separation due to a difference in specific gravity between the hydraulic components in the curable paste _C2 and separation of the hydraulic components from water due to sedimentation are prevented. This promotes uniform dispersion of the particles in the curable paste C ₂ and reduces the extrusion resistance from the pack 10 . In addition, the thickening agent causes the curable paste _C2 to develop thixotropy, which increases its viscosity and reduces fluidity when the external force is removed. As a result, for example, even if the curable paste C ₂ is injected upward into a drilling hole having a vertical depth that can be opened in the ceiling of a culvert exemplified by a box culvert, the curable paste C ₂ Stays in the drilled hole without leaking from the drilled opening.

Thickeners include, for example, methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, and carboxymethylcellulose. One or more of these can be used as the thickener.

Hydraulic composition C ₁ contains 0.1 to 1 part by mass, preferably 0.2 to 0.8 part by mass, and more preferably 0.3 to 0.6 part by mass of the thickener. If the content exceeds this upper limit, the extrusion resistance from the curable paste _C2 pack ₁₀ will be significantly increased, and a cured body C3 having sufficient strength cannot be obtained. On the other hand, if the content is less than the lower limit, the viscosity of the curable paste _C2 will be insufficient. As a result, the curable paste _C2 injected into the drilled holes in the ceiling or wall leaks out from the openings, and the anchor elements cannot be fixed in these drilled holes.

Examples of the present invention will be described in detail below, but the scope of the present invention is not limited to these examples.

(Example)
Raw materials: early-strength Portland cement (manufactured by Ube-Mitsubishi Cement Co., Ltd.), alumina cement (manufactured by Denka Co., Ltd., alumina cement No. 1 molten product), quick setting agent (manufactured by Noritake Co., Ltd., gypsum dihydrate + gypsum hemihydrate) ), strength enhancer (silica fume, manufactured by BASF Japan Ltd., product name: SILICA FUME SILICIUM), fine aggregate (silica sand No. 7, manufactured by Nihon Gyogyo Co., Ltd., product name: N70), setting time adjuster (quench Trisodium acidate) and JIS A6204 (2011) compliant retarding fluidizer (manufactured by Lion Specialty Chemicals Co., Ltd., product name: Leopak (registered trademark) G-100) at the mass ratio shown in Table 1 was weighed and put into a mixer and stirred to prepare a hydraulic composition of a preparation example.

Two pieces of rectangular multi-layer film (160 μm thick) consisting of a 15 μm thick nylon film, a 15 μm thick barrier nylon film and a 130 μm thick LLDPE film laminated in that order were prepared to form a bag. The port, whose opening was closed with a cap, was sandwiched between parts of the peripheral edges of 15 μm-thick nylon films and heat-sealed to fix the port. The portion where the port was fixed was defined as the upper edge portion, and the side edge portions were thermally welded while leaving the lower edge portion. As a result, a bag having a port with an open bottom edge was produced. 2000 g of the hydraulic composition was put into the bag from the opened lower edge. Thereafter, the lower edge portion was heat-sealed, and the hydraulic composition was accommodated in the bag body to prepare a plurality of packs of Examples.

(Comparative example 1)
Hydraulic component (manufactured by Sumitomo Osaka Cement Co., Ltd., product name: Lion Shisui #115) and silica sand No. 6 were weighed according to the mass ratio shown in Table 1, put into a mixer and stirred. A hydraulic composition was prepared. Next, a cylindrical film (thickness: 0.15 mm) made of low-density polyethylene and having openings on two opposite sides was prepared. According to the pouch container disclosed in JP-A-2011-25424, the central portion of this film was sandwiched between partitions so as to be parallel to the two sides of the opening and divided into two. When this partition was directed downward and 400 g of the hydraulic composition of Preparation Comparative Example 1 was put through one opening, the partition came off due to the load. Therefore, the amount of the hydraulic composition was reduced to 300 g, and after putting this into a cylindrical film, one opening was closed by heat welding. Then, 100 g of water was introduced through the other opening of the tubular film, and this other opening was also closed by heat welding. As a result, a plurality of comparative packs were produced in which the first containing portion containing the hydraulic composition and the second containing portion containing water were separated by the divider.

(Comparative example 2)
A hydraulic composition of Comparative Preparation Example 2 was prepared by changing only the mass ratio of each component contained in the hydraulic composition of Preparation Example as shown in Table 1. 500 g of this hydraulic composition was sealed in a water-permeable cylindrical container made of non-woven sheet made of heatron paper with a basis weight of 40 g/m ² , and the hydraulic composition of Comparative Example 2 having a length of 300 mm and a diameter of 34 mm was obtained. A plurality of capsules were produced.

(Preparation of curable paste)
Example packs were prepared. The cap of the pack was removed, and 540 g of water was poured into the bag from the port so that the water ratio (mass of water to mass of hydraulic composition) was 27%. After fitting the cap to the port and rubbing the bag with both hands for 30 seconds, the cap was loosened and the bag was slowly pushed to expel the air from the port. After tightening the cap, the pressure roller was reciprocated for 2 to 3 seconds/reciprocation while pressing on the bag to mix the hydraulic composition and water. As a result, clumps became invisible 30 seconds after the start of mixing by the pressing roller. 2540 g of the curable paste of the example in which the hydraulic composition and water in the bag were homogeneously kneaded was obtained.

A pack of Comparative Example 1 was prepared. After the partition is removed at once and the hydraulic composition is dropped into the water in the pack for pre-mixing, the bag is kneaded by hand or the pack is shaken up and down and left and right to combine the hydraulic composition and water. were mixed. As a result, 400 g of the kneaded curable paste of Comparative Example 1 was obtained 35 seconds after the start of hand kneading of the bag.

The weight of the capsule containing the hydraulic composition of Comparative Example 2 was measured. Next, a tray containing water was prepared. After the fixer capsule of Comparative Example 2 was immersed in this water for 180 seconds, it was removed from the water and weighed. The water absorption amount of the hydraulic composition of Preparation Comparative Example 2 was 135 g, and the water ratio was 27%. When the heatron paper was torn and removed, the water-absorbing hydraulic composition aggregated and could be held by hand. The agglomerated hydraulic composition was put into a cylindrical cartridge having a tip closed with a cap at the tip and an opening at the base end, respectively, through the opening at the base end. The proximal end of a stirring rod having a stirring blade at its tip was connected to the rotating part of an electric drill, and the tip of the stirring rod was inserted into the opening of the cartridge to operate the electric drill and rotate the stirring rod. A hydraulic paste was prepared by stirring the aggregated hydraulic composition with a stirring blade.

For the pack of Example, by mixing the hydraulic composition and water with a pressure roller after pouring water, a curable paste having a weight of 6 times or more that of Comparative Example 1 and about 4 times that of Comparative Example 2 was obtained. , almost the same as in Comparative Example 1, and could be prepared in 1/6 of the time in Comparative Example 2.

(Vibration test)
The capsules containing the hydraulic compositions of Example and Comparative Example 2 were loaded onto a truck. I traveled a distance of about 500 km one way back and forth in a freight car . As a result of visual observation, the packs of Example and Comparative Example 2 showed no change even after three round trips (approximately 3000 km).

(Accelerated deterioration test)
In order to simply confirm the storage stability at a storage temperature of 20° C., first, the conditions for the accelerated deterioration test were set. The test temperature was 60°C, and the acceleration factor was 2 every 10°C. The difference between the storage temperature and the test temperature is 40°C. Therefore, the acceleration in the accelerated deterioration test is 2 ⁴ =16 times. Also, the saturated water vapor content at 60°C is 51.12 g/m ³ . The relative humidity of this saturated water vapor content at 40° C. is 39% RH. According to the above condition settings, a plurality of the packs of Examples and capsules containing the hydraulic composition of Comparative Example 2 were placed in a thermo-hygrostat at a temperature of 60° C. and a humidity of 39% RH, and their appearances were continuously observed. . After 12 days from the start of the test, Example and Comparative Example 2 were removed from the constant temperature and humidity chamber, and then a curable paste was prepared . No bleeding was observed in the curable pastes of Example and Comparative Example 2. Therefore, the test was continued for Example and Comparative Example 2. After 46 days, curable pastes were prepared again for Example and Comparative Example 2. These curable pastes were as non-breathing as the curable pastes prepared after 12 days. Calculation of the storable period in storage at 20° C. revealed that 16×46=736 days, that is, about 2 years at the shortest.

(Compression test)
The pack of the example and the required amount of water were placed in a constant temperature bath at 20°C. After 24 hours, a curable paste of Example was prepared in an atmosphere of 20° C. by the same operation as above. The bag body of the pack was crushed and the curable paste was poured into the formwork from the nozzle to prepare the cured body of the example according to JIS A1108 (2006). A compressive strength test was performed on this cured body according to the same standard, and the compressive strength (N/mm ² ) was measured after 1 day, 7 days and 28 days of curing. All curing conditions were 20° C. and 90% relative humidity. Table 2 shows the results.

As Comparative Example 3, the same hydraulic powder consisting of high-early-strength Portland cement as that used in the Preparation Examples was used. A pack of Comparative Example 3 was produced in the same manner as in Comparative Example 1 except that the hydraulic composition of Comparative Preparation Example 1 was used instead, and the partition was removed to separate the hydraulic powder and water. A curable paste of Comparative Example 3 was prepared by mixing. Next, a cured body of Comparative Example 3 was produced by operating in the same manner as in Example, and the compressive strength was measured. Table 2 shows the results.

A hardened body obtained by hardening the curable paste prepared using the pack and the pressing roller of the example exhibits a compressive strength of 78 N/mm ² after only one day of curing, and after 7 days of curing for 28 days. A compressive strength of approximately 90% of the body was reached. The examples were found to exhibit extremely high compressive strength even after short-term curing. On the other hand, the cured product of Comparative Example 3 exhibited only significantly lower compressive strength than those of Examples.

(Tensile test of anchor bolt)
A hole having a diameter of 18 mm and a length of 95 mm was formed in a concrete mass of 1000×1000×3000 mm using a hammer drill. Anchor bolts fixed to this concrete mass (SD345 deformed steel bar specified in JIS G3112 (2010), name D13, nominal diameter 12.7 mm; standard yield point 43.7 kN (= cross-sectional area of SD345 deformed steel bar 126.7 mm ² × 345 ); a length of 1000 mm and a tip cut off) were prepared. The curable pastes of the examples were prepared in a manner similar to the operation in the compression test. The cap was removed from the port and instead the nozzle was threaded onto the port. Furthermore, an injection tube with an injection amount indication mark was fitted to the tip of this nozzle. The hardening paste was injected into the drilled holes by squeezing the bag by hand. The injection was stopped when the injection amount indication mark appeared and disappeared from the opening of the drilled hole.

After that, the anchor bolt was inserted into the drilled hole while being rotated by hand, and the anchor bolt was fixed to the concrete mass to prepare a sample for tensile test. The fixing length of the anchor bolt at this time was set to 95 mm. After curing for 24 hours at a temperature of 20° C. to generate the hardened body of the example, a hydraulic pump and a hydraulic jack connected thereto and pulled in a direction to pull out the anchor bolt from the concrete mass by the hydraulic pressure generated by the hydraulic pump. A tensile test was performed in accordance with JIS G3112 (2010) using a tensile tester having a load cell for measuring the load generated by the hydraulic jack and a displacement gauge for measuring the amount of displacement of the anchor bolt. The number of samples was N=3. As a result, even if the tensile load reached 50 kN, which exceeds the standard yield point, the anchor bolt did not come out of the concrete block, and there was a danger of the anchor bolt breaking, so the test was stopped. Further, by changing the name or diameter of the anchor bolt as shown in Table 3, test samples were produced in the same manner as above. The number of samples produced was 18 bodies. It was not necessary to repeat the curable paste preparation process to produce these samples, and the curable paste remained in the bag when all the samples were produced.

A curable paste of Comparative Example 3 was prepared by operating in the same manner as in the above compression test. Furthermore, a sample for tensile test was prepared by operating in the same manner as in the example. Since the curable paste was insufficient halfway through the preparation of 18 samples, the curable paste was prepared twice more. A tensile test was performed on the prepared samples. As a result, in the vicinity of the standard yield point of the anchor bolt, the hardened material of Comparative Example 3 fell out of the hole together with the anchor bolt.

As can be seen from Table 3, according to the hardened body of the example, even when the diameter and length of the anchor bolt was pulled with a load exceeding its yield point, it did not come off from the concrete block. On the other hand, according to the hardened body of Comparative Example 3, the anchor bolts were pulled out of the concrete block together with the hardened body at a tensile load near the standard yield point in all samples.

(Bending strength test)
The curable pastes of the examples were prepared by operating in the same manner as in "Preparation of curable pastes" above. This was poured into a formwork of 40 mm long, 160 mm wide and 40 mm high, and cured for 7 days under conditions of 20° C. and relative humidity of 90% to prepare three hardened body samples for the bending strength test of the example. For this cured body sample, a bending strength test was performed at a loading rate of 50 N / sec in accordance with JIS R5201 (2015) "11.2.5 bending strength tester" and "11.7.2 bending strength". . For Comparative Example 3, a hardened sample was produced in the same manner as in Example, and a bending strength test was performed. These results are shown in Table 4.

As can be seen from the average values in Table 4, the cured bodies of Examples had a bending strength that was twice as high as that of Comparative Example 3.

The anchor element anchoring method of the present invention is used for anchoring anchor elements such as anchor bolts and rebars when increasing the shear strength of existing concrete man-made structures and attaching workpieces thereto.

10 is a pack, 11 is a bag, 11a is a welding band, 11a ₁ is an upper edge, 11a ₂ is a side edge, 11a ₃ is a lower edge, 12 is a port, 13 is a cap, 14 is a nozzle, and 15 is an injection. Tube, 15a injection amount indication mark, 16 fastener, 21 funnel, 21a conical portion, 21b pipe portion, 22 connector, 22a scaly ring portion, 23 connecting tube, 24 water injection nozzle, 31 Right hand, 32 left hand, 41 beaker, 42 bottle, 42a mouthpiece, 50 pressing roller, 51 rotating body, 51a ₁ and 51a ₂ bottom, 51b side, 52 rotating shaft, 52a grip, 61 61a is the surface, 61b is drilling, _61b1 is the bottom, 62 is the slope, 71 is the core boring machine, 71a is the core drill, 81 is the anchor bolt, 81a is the rib, 81b is the male screw, 82 is the support, 83 is a nut, A is air, C1 is _a hydraulic composition, _C2 is a hardening paste _, C3 is a hardening body, and W is water.

Claims (12)

A bottle containing water is attached to a pack having a bag body containing a hydraulic composition and a port communicating the outside world and the inner space of the bag body at the top edge of the pack. The water is introduced in a liquid-tight manner from the port having a scaly ring through a connecting tube connected to a connector having a portion , or from the port through a tapered water injection nozzle attached to a bottle containing water. process and
a step of attaching the hydraulic composition and the water-tight cap to the port and applying an external force to the pack to mix the hydraulic composition and the water to prepare a curable paste;
After removing the cap, by crushing the bag, the hardening paste is forced out of the port and injected into a drilled hole in a concrete skeleton;
a step of inserting an anchor element into the drilled hole while piercing the curable paste and curing the curable paste;
having
The hydraulic composition is
a hydraulic component containing Portland cement, alumina cement, and a quick setting agent;
a strength enhancer comprising fine silica particles and/or kaolin;
A sulfonic acid-based fluidizing agent selected from naphthalenesulfonic acid formalin condensates, melamine sulfonic acid formalin condensates, aromatic sulfonic acid formalin condensates, polystyrene sulfonic acid, and salts thereof, polycarboxylic acid, and the following chemical formula (1):

(In chemical formula (1), R ¹ is a hydrogen atom or a methyl group, R ² is an alkylene group having 2 to 4 carbon atoms, R ³ is an alkyl group having 2 to 5 carbon atoms, and n is 1 to is a positive number of 100) and a monomer represented by the following chemical formula (2)

(In the chemical formula (2), R ⁴ , R ⁵ and R ⁶ are a hydrogen atom or a methyl group, M is a hydrogen atom, an alkali metal selected from sodium, lithium and potassium, or from magnesium, calcium and barium at least one of a polycarboxylic acid ether which is a copolymer with the monomer (2) represented by the alkaline earth metal selected, and a carboxylic fluidizing agent selected from salts thereof. a delayed superplasticizer that is
oxycarboxylic acids selected from citric acid, sodium citrate, gluconic acid, tartaric acid, malic acid, salicylic acid, m-oxybenzoic acid and p-oxybenzoic acid, ligninsulfonic acid, sorbitol, pentitol and hexitol a sugar alcohol selected, and an alkaline earth metal salt selected from alkali metal salts thereof, magnesium salts thereof, and calcium salts thereof selected from lithium salts, potassium salts, and sodium salts of oxycarboxylic acids and/or lignosulfonic acids; a setting time modifier that is at least one of
Fine aggregate with a particle size classification of 4 to 8 in accordance with JIS G5901 (2016)
A method for fixing an anchor element , comprising : 2. The anchor element fixing method according to claim 1, wherein the external force is a pressing force of an instrument and/or a human force. The device is a pressing roller having a cylindrical rotating body for pressing the pack on its side surface and a rotating shaft penetrating the central axis of the rotating body and supporting it. The anchor element fixing method according to claim 2, characterized by: 3. The anchor element fixing method according to claim 2, wherein the human force is a force of stepping on, a force of kneading, and/or a force of shaking the pack. 2. The anchoring element fixing method according to claim 1, wherein immediately after the step of adding water, the pack is pushed to expel the air in the pack from the port. A nozzle having an injection tube with an injection amount indication mark attached to its tip is attached to the port. 2. The anchor element according to claim 1, wherein the pack is moved in a direction of withdrawal from the drilled hole, and the injection of the hardening paste is completed when the injection amount indication mark appears and disappears from the drilled hole. fixing method. 2. The anchor element fixing method according to claim 1, wherein said bag contains at most 3000 g of said hydraulic composition. 2. The anchor element fixing method according to claim 1, wherein 20 to 37 parts by mass of said water is added per 100 parts by mass of said hydraulic composition. The hydraulic composition contains 20 to 50 parts by mass of the Portland cement, 30 to 60 parts by mass of the alumina cement, 10 to 40 parts by mass of the quick setting agent, 1 to 10 parts by mass of the strength enhancer, and the 2. The method according to claim 1 , characterized by containing 0.1 to 2 parts by mass of the retarding fluidizing agent, 1 to 10 parts by mass of the setting time adjusting agent, and 10 to 40 parts by mass of the fine aggregate. Anchor element fixing method . In the carboxylic acid-based fluidizing agent, the retarding fluidizing agent is the polycarboxylic ether, and the polycarboxylic ether comprises 10 to 10 of the monomer (1):monomer (2). 95% by mass: 5 to 90% by mass , The anchor element fixing method according to claim 1 . The retarding fluidizing agent can be used to convert the monomer (1) to polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, polybutylene glycol mono(meth)acrylate, methoxypolyethylene glycol mono(meth)acrylate. , ethoxypolyethylene glycol mono(meth)acrylate, methoxypolypropylene glycol mono(meth)acrylate, ethoxypolypropylene glycol mono(meth)acrylate, methoxypolybutylene glycol mono(meth)acrylate, and ethoxypolybutylene glycol mono(meth)acrylate and the monomer (2) is at least one selected from acrylic acid, methacrylic acid, crotonic acid, and metal salts thereof. Method. 2. The anchor element fixing method according to claim 1 , wherein the silica fine particles are silica fume.

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