JP4227080B2 - Method of pouring grout material into rebar joint, grout material and connecting rebar - Google Patents

Description

  The present invention relates to a method of injecting a grout material into a reinforcing bar joint for connecting two reinforcing bars, a grout material used in the method, and a connecting reinforcing bar manufactured by employing the method.

  Generally, when two rebars are connected via a rebar joint, one end of each of the two rebars is inserted into both ends of a tubular rebar joint. Then, grout material is inject | poured into the inside of a joint from the injection hole opened to the outer peripheral surface of a reinforcing bar joint. The grout material injected into the interior of the reinforcing bar joint enters between the inner peripheral surface of the reinforcing bar joint and the outer peripheral surface of the two reinforcing bars and solidifies. As a result, the two reinforcing bars are connected via the reinforcing bar joint.

  Conventionally, when a grout material is injected into a reinforcing bar joint, a grout injection device is used as described in Patent Document 1 below. The grout injection device has a device body. A mounting portion is provided in the apparatus main body. Two supply pipes are attached to the attachment portion in parallel to each other. The main agent is accommodated in one supply pipe, and the curing agent is inserted into the other supply pipe. The main agent and the curing agent accommodated in each supply pipe are discharged from the distal end of each supply pipe by advancing a piston slidably provided at the base end of each supply pipe. The main agent and the curing agent discharged from each supply pipe flow into a cylindrical mixer via a mixing joint provided at the tip of the two supply pipes. And it mixes enough in a mixer and it discharges from the discharge outlet formed in the front-end | tip part of a mixer. Therefore, the grout material is inserted between the inner peripheral surface of the reinforcing bar joint and the outer peripheral surface of the reinforcing bar by pressing the front end of the mixer against the injection hole formed in the reinforcing bar joint or by fitting into the injection hole. Can be injected.

Japanese Patent Laid-Open No. 9-13675

  In the above-described conventional discharge method, each supply pipe is discarded after the main agent and the curing agent respectively contained in the two supply pipes are used up. Each supply pipe has a large rigidity because the piston is slidably provided on the inner peripheral surface thereof, and is difficult to crush. Therefore, the supply pipe is usually discarded as it is without being crushed. For this reason, there existed a problem that the volume as a waste became large.

In order to solve the above problem, a first aspect of the present invention includes an apparatus main body, a plurality of rigid supply pipes mounted on the apparatus main body so as to be immovable in the longitudinal direction, and the inside of each supply pipe. Using a grout injection apparatus comprising a plurality of pistons that are slidably fitted in the longitudinal direction and moved in conjunction with each other by a drive mechanism, and a cylindrical mixer connected to the plurality of supply pipes When injecting each component of a reactive reinforcing bar joint grout material composed of a plurality of components inside the reinforcing bar joint, by moving the piston from the proximal end side to the distal end side of the supply pipe by the drive mechanism, In the method of injecting the grout material from the outlet of the mixer into the rebar joint after each component of the grout material accommodated in each supply pipe is fed into the mixer and mixed, The supply pipe has a cylindrical portion made of a flexible thin film, and a cartridge containing each component of the grout material is detachably inserted therein, and in this state, the piston is moved from the proximal end side of the supply pipe to the distal end. It is characterized in that each component of the grout material is discharged from the tip portion of each cartridge and fed into the mixer by moving toward the side and crushing the cylindrical portion of each cartridge.
In this case, the grout injection device further includes a mixing joint having rigidity, and the mixing joint includes a plurality of fitting portions in which the plurality of supply pipes are detachably fitted and fixed, and in each fitting portion. There are provided a plurality of inflow cylinder portions that are opened and into which the components of the grout material discharged from the cartridge flow in, and a plurality of discharge ports respectively connected to the insides of the plurality of inflow cylinder portions, and the mixer is attached and detached. It is desirable to have a mounting portion that can be mounted.
The cartridge includes a reinforcing ring fitted and fixed to the outer peripheral surface of the distal end portion of the cylindrical portion, a lid portion formed on the reinforcing ring and made of a thin film that closes the distal end opening of the cylindrical portion, and a base of the cylindrical portion. A bottom portion that closes the end opening, and the cylindrical portion is inserted into the supply pipe until the rear end surface of the reinforcing member abuts on the front end surface of the supply pipe. In this state, the supply pipe is connected to the mixing joint. It is desirable that the inflow cylinder part breaks the lid part and protrudes into the cylinder part by being fitted to the fitting part.
It is desirable that the cylindrical portion of the cartridge is formed in a tapered shape so as to have a slightly larger diameter from the proximal end side toward the distal end side.
When the grout material is composed of two components, two of the supply pipe, the piston, and the cartridge are used correspondingly.

A grout material in which the grout material is selected from an epoxy resin system, an acrylic resin system, a urethane resin system, a water glass composition system, and a silica sol system grout material is preferable.
It is desirable that one of the two components of the grout material comprises an epoxy compound (A) and an inorganic filler (B), and the other component comprises an amino compound (C) and an inorganic filler (B).
The viscosity at 25 ° C. immediately after mixing the grout material is desirably 20,000 to 200,000 mPa · s.
It is desirable that the SVI value calculated by the following formula at 25 ° C. immediately after mixing the grout material is 3.0 to 10.0.
S = η1 / η2
here,
η1: Viscosity at 25 ° C at 2 rpm using a BH viscometer, No. 7 spindle η2: Viscosity at 25 ° C at 20 rpm, using a BH viscometer, No. 7 spindle

  According to a second aspect of the present invention, there is provided a reinforcing bar joint having a cylindrical shape, two reinforcing bars inserted at both ends of the reinforcing bar joint, an inner peripheral surface of the reinforcing bar joint, and an outer peripheral surface of the two reinforcing bars. And the grout material filled and solidified between each of the inner and outer surfaces of the reinforcing bar joint by injecting the grout material into the reinforcing bar joint by the injection method according to claim 1. The grout material is filled between the surface and the outer peripheral surface of the two reinforcing bars.

According to the present invention having the above-described characteristic configuration, each component of the grout material hardly adheres to each supply pipe after the grout material is injected. Therefore, each supply pipe does not need to be discarded and can be used again. Only the cartridge is discarded. Since the cylindrical part which occupies most of the cartridge is constituted by a flexible film body, the cartridge is pushed and crushed by the piston during the injection of the grout material. Therefore, when the cartridge is discarded, the volume is significantly smaller than the volume before use. Therefore, the volume as waste can be reduced.
In addition, if a common inorganic filler is blended with a plurality of grout material components, the components can be easily mixed even if they are mixed by the injection method of the present invention, so that the injected grout material is excellent in uniformity.

The best mode for carrying out the present invention will be described below with reference to the drawings.
First, a connecting reinforcing bar manufactured by adopting the injection method according to the present invention will be described. As shown in FIG. 4, the connecting reinforcing bar A includes a reinforcing bar joint 1 and two reinforcing bars 2 and 3. Yes. The reinforcing bar joint 1 has a cylindrical shape, and an internal thread portion 1a is formed on the inner peripheral surface thereof. The reinforcing bar joint 1 is formed with an injection hole 1b penetrating from the outer peripheral surface to the inner peripheral surface and two confirmation holes 1c, 1c. The injection hole 1b is disposed at the center in the longitudinal direction of the reinforcing bar joint 1, and the confirmation holes 1c and 1c are disposed at both ends of the reinforcing bar joint 1, respectively. On the other hand, male screw portions 2a and 3a are formed on the outer peripheral surface of one end of each of the reinforcing bars 2 and 3, respectively. The male screw portions 2a and 3a are respectively screwed to both end portions of the female screw portion 1a of the reinforcing bar joint 1. In this case, the male screw portions 2a and 3a are screwed in until the one end surfaces of the reinforcing bars 2 and 3 abut each other, but the one end surfaces of the reinforcing bars 2 and 3 may be slightly separated from each other.

A tip portion of a mixer 50 described later is inserted into the injection hole 1b , and a grout material is injected from the discharge port 52 thereof. The grout material injected into the injection hole 1 b passes between the inner peripheral surface of the reinforcing bar joint 1 and the outer peripheral surfaces of the reinforcing bars 2, 3 toward both ends of the joint 1. When the grout material is filled almost entirely between the inner peripheral surface of the reinforcing bar joint 1 and the outer peripheral surfaces of the reinforcing bars 2 and 3, the grout material overflows from the confirmation holes 1c and 1c . Thus, it can be seen that the grout material is filled almost entirely between the inner peripheral surface of the reinforcing bar joint 1 and the outer peripheral surfaces of the reinforcing bars 2 and 3. Therefore, the grout injection is stopped. Thereafter, the grout material is solidified. Thereby, the reinforcing bars 2 and 3 are connected and fixed via the reinforcing bar joint 1, and the connecting reinforcing bar A is configured.

Next, the grout injection device will be described in order to inject the grout material from the injection hole 1b into the reinforcing bar joint 1, and the grout injection device B has a device body 10 as shown in FIG. The apparatus main body 10 is provided with a drive shaft 11 at the upper rear end in FIG. 1 (I) so as to be movable in the longitudinal direction, and a drive mechanism for moving the drive shaft 11. The drive mechanism has an operation handle 12 provided at the lower front end of the apparatus main body 10 so as to be rotatable in the directions of arrows A and B in FIG. When the operation handle 12 is rotated in the direction of arrow A, the drive shaft 11 is advanced by a distance corresponding to the rotation amount of the operation handle 12 by the drive mechanism. Since the drive mechanism has a well-known structure, description thereof is omitted. The operation handle 12 is urged to rotate in the direction of arrow B by a biasing means (not shown) such as a coil spring, and can rotate freely after the operation handle 12 is rotated in the direction of arrow A. When it is in the state, it is returned to the initial position shown in FIG. When the operation handle 12 rotates in the arrow B direction, the drive shaft 11 is maintained in a stopped state. The drive shaft 11 may be moved using a drive source such as a motor instead of the operation handle 12 without being moved manually.

  The apparatus main body 10 is provided with a pair of driven shafts 13 and 14 movably in the longitudinal direction. The pair of driven shafts 13 and 14 are arranged on both sides of the drive shaft 11 in parallel with the drive shaft 11. The rear end portions of the drive shafts 13 and 14 are connected and fixed to the rear end portion of the driven shaft 11 via a connecting member 15. Therefore, the driven shafts 13 and 14 move in conjunction with each other. That is, the driven shafts 13 and 14 move forward and backward simultaneously and at the same distance from each other. At the distal end portions of the driven shafts 13 and 14, pressing members 16 and 17 having a dish shape are provided. The outer diameters of the pressing members 16 and 17 are smaller than the inner diameters of supply pipes 21 and 22 described later.

  A support member 18 is provided at the front end of the apparatus main body 10. A mounting portion 19 is configured by the support member 18 and the upper front end portion of the apparatus main body 10. A pair of supply pipes 21 and 22 are detachably attached to the attachment portion 19. The supply pipes 21 and 22 are made of, for example, a resin such as high-strength polyethylene or other high-strength material, and are formed as a cylindrical body having a predetermined or higher rigidity. The inner diameters of the supply pipes 21 and 22 are determined according to the mixing ratio of the grout main agent and the curing agent injected by the grout injection device B. The supply pipes 21 and 22 are connected to each other at intermediate portions and tip portions in the longitudinal direction by connecting portions 23 and 23 so that they can be handled integrally. The supply pipes 21 and 22 may be separated without being connected to each other. The supply pipes 21 and 22 are attached to the attachment portion 19 in a state in which the respective axes coincide with the respective axes of the driven shafts 13 and 14. Therefore, when the driven shafts 13 and 14 are moved forward, the pressing members 16 and 17 enter the supply pipes 21 and 22, respectively, as shown in FIG. It strikes against the fitted pistons 24 and 25. In this state, when the driven shafts 13 and 14 are further advanced, the pistons 24 and 25 are advanced.

The cartridges 31 and 32 are inserted into the supply pipes 21 and 22 from the front end openings of the supply pipes 21 and 22, respectively, with the rear ends thereof first. The cartridge 31 has a cylindrical portion 31a having a circular cross section. The cylindrical portion 31a is configured by a flexible thin film such as a single layer resin film or a laminated film formed by laminating one or more resin films and an aluminum foil. The cylindrical portion 31a is formed in a tapered shape so that the outer diameter thereof becomes slightly larger from the rear end side (base end side) toward the tip end side (right end side to left end side in FIG. 2). The cylindrical portion 31a may be formed with a constant outer diameter. The outer diameter of the distal end portion of the cylindrical portion 31 a is substantially the same as the inner diameter of the supply pipe 21.
The material of the resin film used above is not particularly limited as long as it does not act on the grout material and is not deteriorated by the grout material. For example, polyolefin (polyethylene, polypropylene, etc.), polyester, nylon, etc. These resins are mentioned.
The film thickness is not particularly limited, but is preferably 0.1 μm to 100 μm.

    A reinforcing ring 31b having a predetermined rigidity is fixed to the outer peripheral surface of the distal end portion of the cylindrical portion 31a. The reinforcing ring 31b is fixed to the distal end portion of the cylindrical portion 31a, so that the distal end portion of the cylindrical portion 31a maintains a constant circular cross section. The outer diameter of the reinforcing ring 31 b is substantially the same as the outer diameter of the supply pipe 21. A lid portion 31c is provided on the inner peripheral surface of the reinforcing ring 31b, and the tip opening of the cylindrical portion 31a is closed by the lid portion 31c. The cover part 31c is comprised with the thin film similar to the cylinder part 31a. Therefore, the lid portion 31c can be cut relatively easily by an edge having an acute angle. A bottom portion 31d having rigidity comparable to that of the reinforcing ring 31b is fixed to the outer peripheral surface of the rear end portion of the cylindrical portion 31a. The bottom portion 31d maintains the rear end portion of the cylindrical portion 31a in a circular cross section, and the rear end opening of the cylindrical portion 31a is closed. The main ingredient of the grout material is accommodated in the inside of the cylindrical part 31a whose both end openings are closed by the lid part 31c and the bottom part 31d.

    Similarly to the cartridge 31, the cartridge 32 also has a cylindrical portion 32a, a reinforcing ring 32b, a lid portion 32c, and a bottom portion 32d. However, in the cartridge 32, the outer diameter of the distal end portion of the cylindrical portion 32 a is substantially the same as the inner diameter of the supply pipe 22, and the outer diameter of the reinforcing ring 32 b is substantially the same as the outer diameter of the supply pipe 22. . Further, a grout hardener is accommodated in the cylindrical portion 32a whose both end openings are closed by the lid portion 32c and the bottom portion 32d. In particular, in this embodiment, the amino compound (C) and the inorganic filler (B) are housed in a uniformly mixed state among the components of the reinforced joint grout material.

    The cartridges 31 and 32 are inserted into the supply pipes 21 and 22 from their front end openings with their rear end portions first. The cartridges 31 and 32 are inserted into the supply pipes 21 and 22 until the rear end surfaces of the reinforcing rings 31b and 32b come into contact with the front end surfaces of the supply pipes 21 and 22, respectively. In this state, the bottom portions 31d and 32d are opposed to the pistons 24 and 25 fitted to the rear ends of the supply pipes 21 and 22 with a slight gap.

    The distal ends of the supply pipes 21 and 22 are fitted and fixed to the mixing joint 41. The mixing joint 41 is made of, for example, a relatively hard resin similar to the resin constituting the reinforcing rings 31b and 32b, and has two fitting portions 42 and 43 having a bottomed cylindrical shape with a shallow depth. is doing. The fitting part 42 and the fitting part 43 are arrange | positioned mutually parallel, and the one side part adjacent to each other is connected integrally. The outer periphery of the distal end of the supply pipe 21 is detachably fitted to the inner periphery of one fitting portion 42 until the reinforcing ring 31b of the cartridge 31 abuts the bottom portion 42a. The outer periphery of the distal end portion of the supply pipe 22 is detachably fitted to the inner periphery of the other fitting portion 43 until the reinforcing ring 32b of the cartridge 32 hits the bottom portion 43a. The diameters of these two fitting portions 42 and 43 may be the same or different. Preferably, it is a combination of a large diameter fitting part and a small diameter fitting part. In this embodiment, a large-diameter fitting portion is adopted as one fitting portion 42, and a small-diameter fitting portion is adopted as the other fitting portion 43.

    An inflow tube portion 42 b that protrudes toward the cartridge 31 is formed at the center of the bottom portion 42 a of the large-diameter fitting portion 42. The front end portion of the inflow cylinder portion 42b is formed to form an acute angle, and the length from the bottom portion 42a to the front end of the inflow cylinder portion 42b is longer than the distance from the front end surface of the reinforcing ring 31 to the lid portion 31c. It has become. Therefore, when the supply pipe 21 in which the cartridge 31 is inserted into the large-diameter fitting portion 42 is fitted and fixed, the distal end portion of the inflow cylinder portion 42b forming an acute angle cuts the lid portion 31c and enters the cylinder portion 31a. As a result, the components (A) and (B) of the grout accommodated in the cylindrical portion 31a can flow into the inflow cylindrical portion 42b. An inflow tube portion 43b similar to the inflow tube portion 42b is formed at the center of the bottom portion 43a of the small diameter fitting portion 43, and the distal end portion of the inflow tube portion 43b cuts the lid portion 32c to form the inside of the tube portion 32a. By entering, the components (C) and (B) of the grout accommodated in the cylindrical portion 32a can flow into the inflow cylindrical portion 43b.

    On the outer surface of the bottom portions 42a and 43a in the vicinity of the connecting portion between the large-diameter fitting portion 42 and the small-diameter fitting portion 43, an outflow cylinder portion (attachment portion) 44 that protrudes in the opposite direction to the inflow cylinder portions 42b and 43b is formed. ing. The outflow tube portion 44 has a double tube structure, and has a large diameter tube portion 45 and a small diameter tube portion 46 formed coaxially with the large diameter tube portion 45 inside. An annular first discharge port (discharge port) 47 is formed between the inner peripheral surface of the large-diameter cylindrical portion 45 and the outer peripheral surface of the small-diameter cylindrical portion 46. The first discharge port 47 communicates with the inside of the inflow cylinder portion 42 b through a first passage 41 a formed in the joint 41. The inside of the small diameter cylindrical portion 46 is a second discharge port (discharge port) 48. The second discharge port 48 communicates with the inside of the inflow cylinder portion 43b through a second passage 41b formed in the joint 41.

The base end portion of the mixer 50 is screwed and fixed to the outer peripheral surface of the large diameter cylindrical portion 45. This mixer 50. It has a cylindrical shape, and the components (A), (B), (C), and (B) of the grout discharged from the first and second discharge ports 47 and 48 flow into the cylinder, respectively. Each component that has flowed into the mixer 50 is stirred and mixed while flowing through the mixer 50 toward the tip side. In order to make the mixing of the components more uniform, it is desirable that a mixing spiral body (not shown) is rotatably provided in the mixer 50. A tapered portion 51 having a smaller diameter toward the distal end side is formed at the distal end portion of the mixer 50. It is desirable that the outer diameter of the tip of the taper 51 is slightly smaller than the inner diameter of the injection hole 1b of the reinforcing bar joint 1.

    When the grout material is injected into the reinforcing bar joint 1 in which the reinforcing bars 2 and 3 are screwed to both ends using the grout injection device B having the above-described configuration, the cartridges 31 and 32 are first inserted into the supply pipes 21 and 22, respectively. To do. Next, the supply pipes 21 and 22 are fitted into the large-diameter fitting portion 42 and the small-diameter fitting portion 43 of the mixing joint 41, respectively. In this case, the supply pipes 21 and 22 are arranged such that the reinforcing rings 31b and 32b of the cartridges 31 and 32 are respectively in contact with the bottom portion 42a of the large diameter fitting portion 42 and the bottom portion 43a of the small diameter fitting portion 43. The small diameter fitting part 43 is fitted. Then, the leading end portions of the inflow cylinder portions 42b and 43b break the lid portions 31c and 32c of the cartridges 31 and 32 and enter the cylinder portions 31a and 32a. As a result, the components (A) and (B) of the grout material accommodated in the cartridge 31 can flow into the inflow tube portion 42b, and the components (C) and (B) of the grout material accommodated in the cartridge 32 are obtained. ) Can flow into the inflow cylinder 43b. Thereafter, the supply pipes 21 and 22, the cartridges 31 and 32, and the mixing joint 41 (hereinafter, these three integrated units are referred to as a unit) are mounted on the mounting portion 19 of the grout injection device B. . Of course, at this time, the drive shaft 11 and the driven shafts 13 and 14 of the grout injection device B are moved to the rearmost position in advance.

    When the unit is mounted on the mounting portion 19, the axes of the supply pipes 21 and 22 and the axes of the driven shafts 13 and 14 substantially coincide. Therefore, when the driven shafts 13 and 14 are advanced, the pressing members 16 and 17 enter the supply pipes 21 and 22 and abut against the pistons 24 and 25. When the drive shafts 13 and 14 are further advanced, the pressing members 16 and 17 press the unit forward via the pistons 24 and 25, and the contact protrusion 49 formed on the front surface of the mixing joint 41 is the support member 18. It abuts against a stop portion 18a provided at the front end portion. The unit can no longer move forward. Therefore, after that, when the pressing members 16 and 1 are moved forward, only the pistons 24 and 25 move forward.

    When the grout injection device B is in the above state, the tip of the taper portion 51 of the mixer 50 is inserted into the opening outside the injection hole 1 b of the reinforcing bar joint 1. Of course, at this time, the reinforcing bars 2 and 3 are screwed into both ends of the female threaded portion 1 a of the reinforcing bar joint 1. Thereafter, the pistons 24 and 25 are moved forward. When the pistons 24 and 25 abut against the bottom portions 31d and 32d of the cartridges 31 and 32, the cylindrical portions 31a and 32a of the cartridges 31 and 32 are crushed as the pistons 24 and 25 move forward. As a result, the components (A), (B), (C), and (B) of the grout material respectively accommodated in the cartridges 31 and 32 are pushed out of the cartridges 31 and 32, and the inflow cylinder of the mixing joint 41 It flows into the parts 42b and 43b. The components (A), (B), (C), and (B) flowing into the inflow cylinder portions 42b and 43b pass through the first and second passages 41a and 41b and the first and second discharge ports 47 and 48. The mixture flows into the mixer 50 and is agitated and mixed as it moves through the mixer 50. Each component (A), (B) and (C), (B) constitutes a grouting material for reinforcing steel joints by being mixed.

Although it does not specifically limit as a grout material used for the grout material injection | pouring method of this invention, For example, an epoxy resin type | system | group, an acrylic resin type | system | group, a urethane resin type | system | group, a water glass type composition type | system | group, a silica sol type grout material etc. are mentioned. These are multi-component systems, but are preferably two-component systems.
As for an epoxy resin grout material, it is preferable that one component consists of an epoxy compound (A) and an inorganic filler (B), and the other component consists of an amino compound (C) and an inorganic filler (B).
In the acrylic resin grout material, one component is preferably composed of an acrylic monomer and / or oligomer and an inorganic filler, and the other component is composed of a polymerization initiator and an inorganic filler.
In the urethane resin grout material, it is preferable that one component is composed of a polyvalent hydroxyl group-containing compound and an inorganic filler, and the other component is composed of an isocyanate compound and an inorganic filler.
In the water glass grout material, one component is preferably composed of water glass and an inorganic filler, and the other component is preferably composed of a caking agent (such as zinc borate and aluminum phosphate) and an inorganic filler.
In the silica sol grout material, one component is preferably composed of silica sol and an inorganic filler, and the other component is preferably composed of a caking agent (zinc borate, aluminum phosphate, etc.) and an inorganic filler.
Of these, epoxy resin-based and acrylic resin-based grout materials are more preferable, and epoxy resin-based grout materials are particularly preferable.

As described above, one component of the epoxy resin grout material is composed of the epoxy compound (A) and the inorganic filler (B).
The epoxy compound (A) is not particularly limited as long as it has one or more epoxy groups in the molecule, and can be appropriately selected according to the use and purpose. Preferably, it has 1 to 6 epoxy groups in the molecule. The epoxy equivalent of the epoxy compound (molecular weight per epoxy group) is preferably 65 to 1,000, and more preferably 90 to 500. When the epoxy equivalent is 1,000 or less, the cured product has good physical properties such as water resistance, chemical resistance and mechanical strength. On the other hand, when the epoxy equivalent is 65 or more, the cured product has water resistance and chemical resistance. The cross-linked structure has good properties and mechanical strength.
Examples of the epoxy compound (A) include the following (A-1) to (A-5).

(A-1) Glycidyl ether type glycidyl ether of monohydric phenols (glycidyl ether of monohydric phenols having 6 to 30 carbon atoms such as phenyl glycidyl ether); Diglycidyl ether of dihydric phenols (bisphenol F diglycidyl ether) Diglycidyl ethers of dihydric phenols having 6 to 30 carbon atoms such as bisphenol A diglycidyl ether, bisphenol B diglycidyl ether, bisphenol AD diglycidyl ether, and bisphenol S diglycidyl ether); trivalent to hexavalent or higher Polyglycidyl ether of polyhydric phenols [Pyrogallol triglycidyl ether, phenol or glycidyl ether of cresol novolac resin (molecular weight 200 to 5,000), etc., 6 to 50 or more carbon atoms , Polyglycidyl ether of trihydric to hexahydric or higher polyhydric phenol having a molecular weight of 250 to 5,000]; glycidyl ether of aliphatic monohydric alcohol (allyl glycidyl ether, n-butyl glycidyl ether, etc. 2 carbon atoms) Glycidyl ether of monool having a molecular weight of 150 to 5,000); diglycidyl ether of aliphatic dihydric alcohol [ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, polyethylene 2-100 carbon atoms such as glycol (molecular weight 150-4,000) diglycidyl ether, polypropylene glycol (molecular weight 180-5,000) diglycidyl ether, neopentyl glycol diglycidyl ether, molecular weight 1 Diglycidyl ethers of diols of 0 to 5,000]; polyglycidyl ethers of trihydric to hexahydric or higher aliphatic alcohols [trimethylolpropane triglycidyl ether, glycerol triglycidyl ether, pentaerythritol tetraglycidyl ether, sorbitol hexa Glycidyl ethers of polyhydric alcohols having 3 to 50 or more carbon atoms and a molecular weight of 92 to 10,000, such as glycidyl ether and poly (n = 2 to 5) glycerol polyglycidyl ether Epoxy modified silicone [1,3-bis (3-glycidoxypropyl) -1,1,3,3-tetramethyldisiloxane and the like containing one or more hydroxyl groups and having a molecular weight of 200 to 2,000 Dialkylsiloxane];

(A-2) Glycidyl ester type;
A glycidyl ester of an aromatic carboxylic acid having 6 to 20 or more carbon atoms and a monovalent to 6 or more carbon atoms, and an aliphatic having 2 to 20 or more carbon atoms and a monovalent to 6 or more carbon atoms or Glycidyl ester of alicyclic carboxylic acid; for example, glycidyl ester of aromatic carboxylic acid such as diglycidyl phthalate; aromatic nucleus water addition of glycidyl ester of aromatic carboxylic acid, aliphatic such as dimer acid diglycidyl ester Or a glycidyl ester of an alicyclic carboxylic acid;
(A-3) Glycidylamine type;
Glycidylamines of aromatic amines having 6 to 20 or more carbon atoms and having 1 to 10 or more active hydrogen atoms and glycidylamines of aliphatic, alicyclic or heterocyclic amines; Glycidylamines of aromatic amines such as N-diglycidylaniline and N, N-diglycidyltoluidine; Glycidylamines of aliphatic amines such as N, N, N ′, N′-tetraglycidylxylylenediamine; N, Glycidylamines of alicyclic amines such as hydrogenated compounds of N, N ′, N′-tetraglycidylxylylenediamine; Glycidylamines of heterocyclic amines such as trisglycidylmelamine;

(A-4) a chain aliphatic epoxide;
A chain aliphatic epoxide having 6 to 50 or more carbon atoms and having 1 to 6 or more valences; for example, epoxidation such as epoxidized butadiene (molecular weight 90 to 2,500) having an epoxy equivalent of 130 to 1,000 ) Alkadiene etc .;
(A-5) Alicyclic epoxides Alicyclic epoxides having 6 to 50 or more carbon atoms, a molecular weight of 90 to 2500, and 1 to 4 or more epoxy groups; for example, vinylcyclohexene dioxide, dicyclopentadiene Dioxide and the like;
Of these, glycidyl ether type (A-1) is preferable from the viewpoint of the strength of the grout material cured product, and (poly) glycidyl ether of phenols is particularly preferable.

The kind of the inorganic filler (B) is not particularly limited and can be appropriately selected depending on the purpose of use. Specifically, for example, glass powders such as borate glass powder, sodium salt glass powder, silicate glass powder, aluminum compounds such as alumina and aluminum sulfate; barium compounds such as barium titanate and barium borate Calcium compounds such as calcium carbonate, calcium silicate and calcium phosphate; potassium compounds such as potassium aluminum sulfate, tripotassium phosphate and potassium aluminum silicate; sodium compounds such as sodium aluminum sulfate and sodium magnesium silicate; magnesium carbonate and magnesium sulfate Magnesium compounds such as zinc borate, zinc silicate, zinc titanate, etc .; sepiolite, wollastonite, fly ash, slag, syenite powder, anorthite powder, feldspar powder, agate stone powder, kaolin, talc, Squid, clay, sericite, asbestos, zircon, zeolite, silica, bentonite, shirasu balloon, metal powder or the like;
Is mentioned. You may use these as a 1 type, or 2 or more types of mixture.
Of these, glass powder, aluminum compound, calcium compound and zinc compound are preferred, and glass powder and calcium compound are more preferred.
The shape of (B) is not particularly limited, and may be powdery or beaded, and may be granular or hollow.
The volume average particle diameter of (B) is preferably 0.1 μm to 300 μm, more preferably 0.2 μm to 200 μm.

The blending ratio of (A) and (B) is preferably 10 to 95:90 to 5 parts by mass, more preferably 20 to 90: 100 parts by mass of the total of (A) and (B). 80 to 10 parts by mass.
The blending method of (A) and (B) is not limited as long as it can be mixed, but a method of mixing each component using an ordinary mixer such as a universal mixer is preferably used.
The viscosity of the blend of (A) and (B) is preferably 3,000 to 40,000 mPa · s, more preferably 5,000 to 300,000 mPa · s.

The other component of the epoxy resin grout material comprises an amino compound (C) and an inorganic filler (B).
The amino compound (C) is a compound having two or more active hydrogens derived from an amino group, and the following (C-1) to (C-9) can be mentioned. The active hydrogen derived from an amino group refers to a hydrogen atom that is directly bonded to a nitrogen atom of the amino group. Preferred are compounds having 2 to 10 active hydrogens derived from amino groups in the molecule, and more preferred are compounds having 3 to 6 active hydrogens.
The active hydrogen equivalent (molecular weight per active hydrogen) of (C) is preferably 15 to 500, more preferably 20 to 200. When the active hydrogen equivalent is 500 or less, physical properties such as adhesion and durability of the cured product are good. When the active hydrogen equivalent is 15 or more, the cured product has good physical properties such as adhesiveness, durability, and chemical resistance.

(C-1) Aliphatic amines (2-18 carbon atoms, 1-7 functional groups, molecular weight 60-500);
(i) Aliphatic amines (alkylamines having 6 to 18 carbon atoms (octylamine, etc.), alkylenediamines having 2 to 6 carbon atoms (ethylenediamine, propylenediamine, tetramethylenediamine, pentaethylenehexamine, hexamethylenediamine, etc.), poly Alkylene (2 to 6 carbon atoms) polyamine [diethylenetriamine, iminobispropylamine, triethylenetetramine, pentaethylenehexamine, etc.]};
(ii) These alkyl (carbon number 1 to 4) or hydroxyalkyl (carbon number 2 to 4) substituents [dialkyl (carbon number 1 to 3) aminopropylamine, N, N′-dimethylhexamethylenediamine, aminoethyl Ethanolamine, 2,5-dimethylhexamethylenediamine, etc.];
(iii) aromatic amines (carbon number 8-15) (xylylenediamine, etc.);

(C-2) alicyclic polyamine (4 to 15 carbon atoms, 2 to 3 functional groups);
1,3-diaminocyclohexane, isophoronediamine and the like;
(C-3) heterocyclic polyamine (4-15 carbon atoms, 2-3 functional groups);
Piperazine, N-aminoethylpiperazine, [3,9-bis (3-aminopropyl) -2,4,8,10-tetraoxaspiro [5,5] undecane, etc.] and the like;
(C-4) Polyamide polyamine;
Obtained by condensation of dicarboxylic acid (dimer acid, etc.) and an excess of polyamines (having 2 moles of primary and secondary amino groups per mole of acid) (the alkylene diamine, polyalkylene polyamine, etc. having 2 to 7 functional groups). Polyamide polyamine (number average molecular weight 200-1,000), etc .;

(C-5) polyether polyamine (number of functional groups; preferably 2 to 7);
Hydride of cyanoethylated polyether polyol (number of functional groups; preferably 2 to 7) (molecular weight 230 to 1,000) and the like;
(C-6) an epoxy-added polyamine;
Epoxy-added polyamine (molecular weight 230) obtained by adding 1 to 30 mol of an epoxy compound [polyepoxide and monoepoxide described in JP-A-2001-40331] to polyamines (the above-mentioned alkylenediamine, polyalkylenepolyamine, etc.) ~ 1,000) etc .;
(C-7) Cyanoethylated polyamine: cyanoethylated polyamine, biscyanoethyldiethylenetriamine, etc. (molecular weight 230 to 606) obtained by addition reaction of acrylonitrile and polyamines (the aliphatic polyamine etc.);
(C-8) amino-modified silicone;
A compound in which an amino group is introduced into a polydialkylsiloxane having a molecular weight of 200 to 2,000 (eg, polydimethylsiloxane), for example, 1,3-bis (3-aminopropyl) -1,1,3,3-tetramethyl Disiloxane, 1,3-bis (3-aminopropyl) -1,1,3,3-poly (n = 2 to 20) tetramethyldisiloxane and the like;

(C-9) Other polyamine compounds;
(i) Hydrazines (hydrazine, monoalkyl (C1-5) hydrazine, etc.);
(ii) Dihydrazides (aliphatic dihydrazides having 4 to 30 carbon atoms such as succinic acid dihydrazide and adipic acid dihydrazide; aromatic dihydrazides having 10 to 40 carbon atoms such as isophthalic acid dihydrazide and terephthalic acid dihydrazide;);
(iii) Guanidines (alkyl guanidines having 1 to 5 carbon atoms such as butylguanidine; cyanoguanidines such as 1-cyanoguanidine);
(iv) dicyandiamide and the like;
And a mixture of two or more of these.
Of the above (C), preferred are (C-2), (C-3), (C-4) and (C-6), and particularly preferred is (C-1).

Examples of the inorganic filler (B) are the same as those described above, and preferable ones are also the same. In (B), one added to one and the other added to the other may be the same or different, but are preferably the same.
The compounding ratio of (C) and (B) is preferably 10 to 95:90 to 5 parts by mass, more preferably 20 to 90: 100 parts when the total of (C) and (B) is 100 parts by mass. 80 to 10 parts by mass.
As a blending method, a method of mixing each component using an ordinary mixer such as a universal mixer is suitably used.
The viscosity of the blend of (C) and (B) is preferably 3,000 to 40,000 mPa · s, more preferably 5,000 to 300,000 mPa · s.

Moreover, the C2-C6 alkylene oxide (AO) adduct (D) of a polyol can be further contained as needed. When (D) is contained, it may be contained in either one of the combination of (A) and (B), the combination of (C) and (B), or both.
By containing (D), the effect of preventing the occurrence of sagging is improved even after injection into the reinforcing bar joint without impairing workability.
(D) is obtained by adding an alkylene oxide (AO) to a polyol. The polyol used for this purpose is, for example, a polyhydric alcohol having 2 to 8 or more and 2 to 30 carbon atoms and 2 to 8 or more carbons [a dihydric alcohol such as ethylene glycol or propylene glycol; Trivalent alcohols such as glycerin and trimethylolpropane; 4- to 8-valent alcohols such as pentaerythritol, dipentaerythritol, glucose, and sucrose], 2 to 8 or more, and polyvalent 6 to 40 carbon atoms Phenol (polyphenols such as pyrogallol and hydroquinone; bisphenols such as bisphenol A and bisphenol F) and the like.
These polyols can be used alone or in combination of two or more. Of these, polyhydric alcohols are preferable, and polyhydric alcohols having 2 to 4 valences and 2 to 10 carbon atoms are more preferable.

Examples of (AO) include ethylene oxide (referred to as EO), propylene oxide (referred to as PO), butylene oxide, and the like, preferably (EO) and (PO).
When (EO) and (PO) are used as (AO), the addition form of (EO) and (PO) to the polyol may be random addition or block addition, but is preferably random addition. Random addition improves the injection workability and thixotropy of the compound and further improves the effect of preventing sagging even after injection into a reinforcing bar joint.
In this case, the ratio of the number of added moles of (EO) and (PO) is preferably 1: 0.1 to 0.5, and more preferably 1: 0.12 to 0.35. When the number of moles of (PO) added is 0.1 or more, the thixotropic property of the blend is good and the sagging after injection is difficult, and when it is 0.5 or less, the workability is good.
When (D) is contained, the addition amount is not particularly limited, but is preferably 0.1 to 10 parts by mass when the total of (A), (B), and (C) is 100 parts by mass.

Moreover, a hardening accelerator (E) can further be contained. When (E) is contained, it is preferably contained in the blend of (C) and (B).
Curing accelerators (E) include tertiary amino compounds (E1), alkaline compounds (E2) such as sodium methylate, caseisoda, caustic potash, lithium carbonate, and Lewis base compounds such as triethylphosphine and triphenylphosphine. (E3), phenols such as phenol, 4-t-butylphenol and 2,4-di-t-butylphenol (E4), acids such as phosphoric acid and salicylic acid (E5), salts such as sodium phosphate and sodium salicylate ( E6). Of these, the tertiary amino compound (E1) is preferred.

The tertiary amino compound (E1) preferred as the (E) is not particularly limited as long as it has a tertiary amino group in the molecule, and examples thereof include the following (E1-1) to (E1-3). It is done.
(E1-1) Aliphatic tertiary amine: trimethylamine, triethylamine, dimethylcyclohexylamine, tetramethylhexane-1,6-diamine, tetramethylguanidine, dimethylpiperazine, N-methylmorpholine, dimethylaminoethanol, dimethylaminoethoxy Ethanol, N-methyl-N ′-(2-hydroxyethyl) morpholine, etc.

(E1-2) Phenolic core-containing aliphatic tertiary amine: N, N-dimethylaminomethylphenol (commonly called “DMP-10”), etc.
(E1-3) Nitrogen-containing heterocyclic compound 1,8-diazabicyclo (5,4,0) -undecene-7 (San Apro; trademark “DBU”), 1,5-diazabicyclo (4,3,0) -nonene -5 (San Apro Corporation; trademark “DBN”), 6-dibutylamino-1,8-diazabicyclo (5,4,0) -undecene-7 (San Apro Corporation; trademark “DBA-DBU”) and the like.
The type and amount of the tertiary amino compound (E1) may be appropriately selected according to the curing rate to be obtained and the pot life. For example, the amount of (E1) is preferably 1 to 100 parts by mass when the total of (A) + (C) is 100 parts by mass.

If necessary, the blend may further include additives other than (A) and (C), for example, (1) adhesion-imparting agents such as silane coupling agents and titanium coupling agents, (2) hindered amines, Antioxidants such as sulfur-containing compounds, (3) UV absorbers such as benzophenones, benzotriazoles, salicylic acid esters, metal complex salts, (4) metal soaps, heavy metals (eg, zinc, tin, lead, cadmium, etc.) ) Stabilizers such as inorganic and organic salts, organotin compounds, (5) Plasticizers such as phthalate esters, phosphate esters, fatty acid esters, castor oil, liquid paraffin, alkyl polycyclic aromatic hydrocarbons, (6) paraffins Waxes such as wax, microcrystalline wax, dense wax, whale wax, low molecular weight (molecular weight 1,000 to 10,000) polyolefin, (7 Non-reactive diluents such as benzyl alcohol, tar and pitumen, (8) Esters (such as ethyl acetate), aromatic hydrocarbons (such as toluene), alcohols (such as methanol), ethers (such as diethyl ether), ketones (such as methyl ethyl ketone) )), (9) foaming agent, (10) antifoaming agent, (11) dehydrating agent, (12) antistatic agent, (13) antibacterial agent, (14) antifungal agent, (15) perfume, ( 16) A flame retardant, (17) a dispersant and the like can be added. Two or more of these may be used in combination.
When these additives are contained, they may be contained in either the blend of (A) and (B), or the blend of (C) and (B), preferably (C) and (B). This is the case where it is contained in the blend. These addition amounts are not particularly limited, but are preferably 0.01 to 10 parts by mass when the total of (A), (B), and (C) is 100 parts by mass.
The ratio of the component (A) + (B) and the component (C) + (B) is preferably an integer ratio by volume ratio. For example, as a preferable example, the volume ratio is 1: 1, 2: 1. 1: 2, 4: 1, 1: 4, and the like.

It is desirable that the grout material for reinforcing steel joints has a viscosity of 20,000 to 200,000 mpa · s at 25 ° C. immediately after mixing the plurality of components. When the viscosity is 20,000 mpa · s or more, the fluidity is not too high, and when the mixing joint 41 is attached to the supply pipes 21 and 22, the grout material is removed from the lid portions 31 c and 32 c of the cartridges 31 and 32. There is no risk of leakage. On the contrary, when the viscosity of the grout material is 200,000 mpa · s or less, the viscosity is not too high, and the grout material is sufficiently discharged from the cartridges 31 and 32 in a short time.
Further, when the viscosity is 20,000 mpa · s or more, the fluidity is not too high, and the grout material filled between the inner peripheral surface of the joint 1 and the outer peripheral surfaces of the reinforcing bars 2 and 3 is not solidified before solidifying. There is no risk of running out of the space. On the contrary, when the viscosity of the grout material is 200,000 mpa · s or less, the viscosity is not too high, and the grout material spreads between the inner peripheral surface of the joint 1 and the outer peripheral surface of the reinforcing bars 2 and 3, There is no space not filled with the grout material between them, and there is no possibility that the connection strength between the joint 1 and the reinforcing bars 2 and 3 is lowered.

The SVI value calculated by the following formula at 25 ° C. immediately after mixing the grout material is preferably 3.0 to 10.0.
S = η1 / η2
here,
S: SVI value η1: Viscosity at 25 ° C. at 2 rpm using a BH viscometer, No. 7 spindle.
η2: Viscosity at 25 ° C. at a rotation speed of 20 rpm using a BH viscometer, No. 7 spindle.
When the SVI value is 3.0 or more, the grout material does not leak from the lid portions 31c and 32c of the cartridges 31 and 32 when the mixing joint 41 is attached to the supply pipes 21 and 22, and the tip of the mixer 50 There is no risk of sagging from the opening. Conversely, when the SVI value is 10.0 or less, the grout material is sufficiently discharged from the cartridges 31 and 32 in a short time.
Note that the viscosity and SVI value of the grout material are set to the above values, for example, selection of the type of epoxy resin (A) and amino compound (C), selection of the type of inorganic filler (B), epoxy resin (A ) And an inorganic filler (B) and / or an amino compound (C) and an inorganic filler (B) can be achieved by appropriately adjusting the blending ratio.
The conditions for curing the injected grout material may be conventionally known conditions, and the temperature is preferably 5 to 40 ° C, particularly preferably 10 to 35 ° C.

  The grout material mixed in the mixer 50 flows into the joint 1 through the injection hole 1 b and enters between the inner peripheral surface of the reinforcing bar joint 1 and the outer peripheral surfaces of the reinforcing bars 2 and 3. When the grout material is filled in the entire area between the inner peripheral surface of the reinforcing bar joint 1 and the outer peripheral surfaces of the reinforcing bars 2 and 3, the grout material leaks to the outside from the confirmation holes 1c and 1c. Thereby, it turns out that the grout material was filled in the whole between the inner peripheral surface of the reinforcing bar joint 1 and the outer peripheral surfaces of the reinforcing bars 2 and 3. Thereafter, the injection of the grout material is terminated. When the grout material is solidified, a connecting reinforcing bar A composed of the reinforcing bar joint 1 and two reinforcing bars 2 and 3 connected and fixed to both ends thereof is formed.

  When the grout material is repeatedly injected into the reinforcing bar joint 1 and the cartridges 31 and 32 are crushed until the components (A), (B), (C), and (B) contained therein are used up, The shafts 13 and 14 are moved rearward, and the pressing members 16 and 17 are extracted rearward from the supply pipes 21 and 22. Then, the entire unit composed of the mixing joint 41, the supply pipes 21 and 22, and the cartridges 31 and 32 can be detached from the mounting portion 19 of the injection device B. After the unit is removed from the mounting portion 19, the supply pipes 21 and 22 and the reinforcing rings 31 b and 32 b of the cartridges 31 and 32 are removed from the large-diameter fitting portion 42 and the small-diameter fitting portion 43 of the mixing joint 41. Thereafter, the used cartridges 31 and 32 are extracted from the supply pipes 21 and 22.

  The used cartridges 31 and 32 are discarded. In this case, since the cylindrical portions 31a and 32a of the cartridges 31 and 32 are crushed, the volume of waste can be reduced. Therefore, it is possible to easily carry and dispose of the waste. On the other hand, since the grout material does not adhere to the supply pipes 21 and 22, it can be used again without being discarded.

In addition, this invention is not limited to said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the above embodiment, the two supply pipes 21 and 22 and the two cartridges 31 and 32 are used corresponding to the fact that the grout material is composed of two components. When constituted by mixing three or more components, three or more supply pipes and cartridges are provided. Of course, three or more driven shafts are provided correspondingly.
The cartridges 31 and 32 have rigid reinforcing rings 31b and 32b and bottom portions 31d and 32d, but they are not always necessary. For example, the opening portions at both ends of the cylinder portions 31a and 32a may be closed by winding and tightening metal wires around the both ends of the cylinder portions 31a and 32a. In that case, after inserting the two cartridges into the supply pipes 21 and 22, respectively, one end of each cylindrical portion 31a, 32a on the side of the mixing joint 41 is cut and opened inside the metal wire, What is necessary is just to insert inflow cylinder part 42b, 43b of the coupling 41 in an opening part.

Reinforcing bar joint performance criteria when two reinforcing bars are connected via a reinforcing bar joint include the Reinforcing Bar Joint Performance Judgment Standard of the Ministry of Land, Infrastructure, Transport and Tourism based on a tensile test of the reinforcing bar joint.
That is, a tensile load is applied to the reinforcing bar joint up to 95% of the standard yield strength of the reinforcing steel bar, then the load is changed to a compressive load, compressed to 2% of the standard yield strength of the reinforcing bar, and then yielded again. Apply tensile load up to and measure stress and displacement. E0 is the base material's elastic modulus, E70 is the apparent elastic modulus obtained by dividing the stress at 70% of the standard yield strength of the reinforcing bar by the cross-sectional area when the tensile load is first applied, and the tensile load is the first. E95 is the apparent elastic modulus obtained by dividing the stress at 95% of the standard yield strength of the reinforcing bar by the cross-sectional area, and S is the slip amount of the joint when compressed to 2% of the standard yield strength of the reinforcing bar. When E70 / E0 ≧ 0.9, E95 / E0 ≧ 0.7, and S ≦ 0.3 are satisfied, it is determined that the rebar joint performance is class A, and there is no practical problem.
It is a satisfactory one that satisfies Class A of the rebar joint performance judgment standard of the Ministry of Land, Infrastructure, Transport and Tourism by the tensile test of the connecting rebar of the present invention.

  Hereinafter, the present invention will be further described with reference to examples, but the present invention is not limited thereto.

Production Example 1
A stirred autoclave was charged with 147 parts of propylene glycol and 0.76 part of potassium hydroxide as a catalyst, and a mixture of 682 parts of ethylene oxide and 171 parts of propylene oxide was blown into the autoclave and reacted at 110 ° C. for 5 hours. After aging for 3 hours at 130 ° C., treated with “Kyoward 600” magnesium oxide adsorbent (magnesium oxide adsorbent: manufactured by Kyowa Chemical Industry Co., Ltd .: “Kyoward 600”), removed the catalyst, and added alkylene oxide. Product H was obtained. This product had a hydroxyl value of 28 and a viscosity of 700 mPa · s / 25 ° C.

Example 1
In an atmosphere of 25 ° C., the respective components were mixed and stirred at the blending amounts shown below, and two cartridges were filled with the epoxy resin main component and the epoxy resin curing agent, respectively.
[Epoxy resin main agent]
Epicoat 828 260 parts Epiol B 25 parts Alkylene oxide adduct of Production Example 1 3 parts Whiten SB 175 parts [Epoxy resin curing agent]
Pentaethylenehexamine 50 parts Alkylene oxide adduct of Production Example 1 2 parts Whiten SB 105 parts

Epicoat 828 (Bisphenol A diglycidyl ether manufactured by Japan Epoxy Resin Co., Ltd., viscosity 11,000 mPa · s / 25 ° C., epoxy equivalent 190);
Epiol B (Nippon Yushi Co., Ltd. butyl glycidyl ether, viscosity 1 mPa · s / 25 ° C., epoxy equivalent 135);
Whiteon SB (Calcium carbonate by Shiraishi Calcium Co.)
Pentaethylenehexamine (manufactured by Tosoh Corporation, viscosity 70 mPa · s / 25 ° C., active hydrogen equivalent 29)
The viscosity of the main agent was 51,000 mPa · s, and the viscosity of the curing agent was 48,000 mPa · s. The viscosity was measured at 25 ° C. using a BH viscometer and a No. 7 spindle at a rotation speed of 20 rpm.
After the main agent and the curing agent are filled in two cartridges, each cartridge is inserted into two supply pipes, and a mixing joint is fitted and fixed to the tip of each supply pipe to form a unit. It was mounted on the mounting part of the grout injection device. Thereafter, the two pistons were moved forward to crush each cartridge, whereby the main agent and the curing agent were introduced into the mixer via the mixing joint, and mixed in the mixer. The grout material constituted by mixing was poured directly into the reinforcing bar joint (size: D29) from the mixer before curing. When the time (injection time) from the start of injection until it overflowed from the reinforcing bar joint was measured, it was a good result of 25 seconds. The viscosity immediately after mixing was 54,000 mPa · s.
Further, the appearance of the two cartridges after the grout material has been completely discharged has a situation like an accordion when the cylinder portion is shrunk by being crushed.
In addition, when grout material was injected into a reinforced joint (size: D29) under the above conditions, and a joint performance test was conducted after curing at 25 ° C. for 1 week, A The level was satisfactory and practically no problem.

  The grout material injection method of the present invention is useful as a grout material injection method for reinforcing steel joints used in concrete structures.

It is a figure which shows the injection | pouring apparatus for enforcing the injection | pouring method based on this invention, Comprising: FIG.1 (I) is the side view, FIG.1 (II) is the top view. It is an expanded sectional view which follows the XX line of FIG. It is the arrow X figure of FIG. 2 which shows the coupling joint used in the injection apparatus. It is sectional drawing which shows the joint into which grout material is inject | poured by the injection | pouring method which concerns on this invention, and the two rebars screwed together by the both ends of the joint.

Explanation of symbols

A Connecting reinforcing bar B Grout injection device 1 Reinforcing bar joint 2 Reinforcing bar 3 Reinforcing bar 10 Device body 19 Mounting portion 21 Supply tube 22 Supply tube 24 Piston 25 Piston 31 Cartridge 31a Tube portion 31b Reinforcement ring 31c Cover portion 31d Bottom portion 32 Cartridge 32a Tube portion 32b Reinforcement Ring 32c Lid 32d Bottom 41 Mixing joint 42 Large diameter fitting part (fitting part)
42a Bottom part 42b Inflow cylinder part 43 Small diameter fitting part (fitting part)
43a bottom part 43b inflow cylinder part 44 outflow cylinder part (attachment part)
47 First discharge port (discharge port)
48 Second discharge port (discharge port)
50 Mixer 52 Discharge port

Claims (8)

A main body of the apparatus, a plurality of rigid supply pipes mounted on the main body of the apparatus so as to be immovable in the longitudinal direction, and fitted inside the supply pipes so as to be slidable in the longitudinal direction. Reactive reinforced joint grout made of a plurality of components inside the reinforced joint using a grouting device comprising a plurality of pistons moved in a cylinder and a cylindrical mixer connected to the plurality of supply pipes When injecting each component of the material, the drive mechanism moves the piston from the proximal end side to the distal end side of the supply tube, thereby feeding each component of the grout material accommodated in each supply tube into the mixer. In the method of injecting the grout material into the rebar joint from the outlet of the mixer after mixing in
A cylindrical portion made of a flexible thin film, a reinforcing ring fitted and fixed to the outer peripheral surface of the distal end portion of the cylindrical portion, a lid portion made of a thin film provided on the reinforcing ring and closing the distal end opening of the cylindrical portion, and the cylindrical tube A cartridge that has a bottom part that closes the base end opening of the part and contains each component of the grout material inside is used.
The grout injection device further comprises a mixing joint having rigidity,
The mixing joint includes a plurality of fitting portions in which the plurality of supply pipes are detachably fitted and fixed, a plurality of inflow cylinder portions each opening in each fitting portion, and an interior of each of the plurality of inflow cylinder portions A plurality of outlets connected to each other, and having an attachment portion to which the mixer is detachably attached,
The cylindrical portion is inserted into the supply pipe until the rear end surface of the reinforcing ring hits the front end surface of the supply pipe, and in this state, the supply pipe is fitted into the fitting portion of the mixing joint. The inflow cylinder part breaks the lid part and protrudes into the cylinder part. In this state, the piston is moved from the proximal end side to the distal end side of the supply pipe to push the cylinder part of each cartridge. A method for injecting a grout material into a reinforcing bar joint, wherein each component of the grout material is discharged from the front end portion of each cartridge by crushing and fed into the mixer via the inflow cylinder portion and the attachment portion. . 2. The grout material for a reinforcing bar joint according to claim 1, wherein the cylindrical portion of the cartridge is formed in a tapered shape so as to have a slightly larger diameter from the proximal end side toward the distal end side. Injection method. The grout material for a reinforcing bar joint according to claim 1 or 2, wherein the grout material is composed of two components, and two of the supply pipe, the piston, and the cartridge are used correspondingly. Injection method. A grout material, wherein the grout material used in the injection method according to claim 3 is selected from an epoxy resin system, an acrylic resin system, a urethane resin system, a water glass composition system, and a silica sol system grout material. One of the two components of the grout material used for the injection method according to claim 3 is composed of an epoxy compound (A) and an inorganic filler (B), and the other component is an amino compound (C) and an inorganic filler ( A grout material comprising B). A grout having a viscosity of 20,000 to 200,000 mPa · s at 25 ° C immediately after mixing of the two components of the grout material used in the injection method according to claim 3. The SVI value calculated by the following formula at 25 ° C immediately after mixing of the two components of the grout material used in the injection method according to claim 3 is 3.0 to 10.0. Wood.
S = η1 / η2
here,
η1: VH viscosity at 25 ° C. at 2 rpm using a No. 7 spindle η2: Viscosity at 25 ° C. at 20 rpm using a BH viscometer, No. 7 spindle Filled and solidified between each of the cylindrical reinforcing bar joints, the two reinforcing bars inserted at both ends of the reinforcing bar joint, and the inner peripheral surface of the reinforcing bar joint and the outer peripheral surface of the two reinforcing bars. It consists of grout materials, and the said grout material is inject | poured in the inside of the said reinforcing bar joint by the injection | pouring method in any one of Claims 1-3, The outer peripheral surface of the said reinforcing bar joint and the outer periphery of the said two reinforcing bars A connecting reinforcing bar, wherein the grout material is filled between each surface.

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