JP6094033B2 - Shear reinforcement method for concrete structure using cartridge-based cementitious composition - Google Patents

Description

  The present invention relates to a shear reinforcement method for a concrete structure using a cementitious composition containing a cartridge, and particularly to a shear reinforcement method for a concrete structure using a cemented composition containing a cartridge, which has good workability and a high reinforcing effect. Is.

The following methods have been proposed as shear reinforcement methods for existing concrete structures.
For example, Japanese Unexamined Patent Application Publication No. 2010-095963 (Patent Document 1) describes an earthquake resistance of an existing building in which a reinforcing member is integrally installed and fixed in a frame surrounded by columns and beams of the existing building or on the side of the frame. In the reinforcing structure, a linear kerf capable of inserting a plate material is formed on the construction surface of the frame, and a plate-like shear key is inserted and installed in the kerf, and the kerf and the frame and the reinforcing member A seismic reinforcement structure for an existing building is proposed in which a solidifying material is filled in between, and the frame and the reinforcing member are joined. Specifically, the shear key has an approximately X shape, an approximately V shape, an approximately T shape, It has a horizontal cross-sectional shape of approximately H shape, approximately U shape, approximately B shape, or approximately I shape, and the kerf is approximately X shape, approximately V shape, approximately T shape, approximately H shape, approximately approximately U shape so that the shear key can be inserted. Of an existing building having a planar shape of a shape, a substantially B shape or a substantially I shape Shin reinforcing structure has been proposed.

  Japanese Patent Application Laid-Open No. 2009-263156 (Patent Document 2) discloses that a bolt embedding hole (4) of a concrete structure (1) is filled with an organic adhesive (10) and the bolt embedding hole is provided. The anchor bolt (11) inserted in (4) is fixed to the concrete structure (1) by curing the organic adhesive (10), and near the opening (4a) of the bolt embedding hole (4) A cement-based material (12) having fire resistance is poured into the organic adhesive (10) so that the organic adhesive (10) is not exposed on the surface of the concrete structure (1). A bolt construction method is disclosed.

  Further, JP 2010-13902 A (Patent Document 3) discloses a resin composition for post-construction anchors used for fixing an anchor member in a hole provided in the base member when the anchor member is embedded in the base member. The resin composition for post-construction anchors includes a radical polymerizable oligomer and a radical polymerizable monomer, and further comprises a wax as an essential component. ing.

  In JP 2010-168727 A (Patent Document 4), a water curable cement composition is filled into a water-permeable container to form a cement filler, and the storage portion of the cement filler and the water storage portion are integrated. The cement filler and water are separately stored and sealed in advance in the container formed in the container, and the cement filler is immersed in the water to absorb water and absorbed in the container. After removing the filler from the container and inserting the anchor into a fixing hole drilled in the workpiece to be fixed, the anchor is pierced into the cement filler and the water-curable cement composition is cured. A post-construction anchor construction method characterized by fixing the anchor is described.

  Japanese Patent Application Laid-Open No. 2010-208682 (Patent Document 5) discloses a cylinder having a discharge port at one end, a piston wall movable toward the discharge port in the cylinder, and a hydraulic composition in the cylinder. There is disclosed a cartridge for a hydraulic composition characterized in that a powder of a product is accommodated.

However, in the conventional post-installation anchor method, holes are drilled in pillars and beams with a hammer drill, etc., so there is a problem that large vibration and noise occur during construction, and it cannot be applied to reinforcement work while using buildings. .
In addition, the conventional bonding method is superior to the construction anchor method in that it does not cause problems of vibration and noise, but there is a problem that the reinforcing effect is reduced compared to the post-construction anchor method. .
Moreover, in the resin-based anchor material, there remains a problem in fire resistance, and it is necessary to insert the cement container into the hole drilled by hitting.
In particular, in a shear reinforcement method that requires a drilling depth deeper than that of a normal anchor, the adverse effect is even greater.

JP 2010-095963 A JP 2009-263156 A JP 2010-13902 A JP 2010-168727 A JP 2010-208682 A

  The object of the present invention is to solve the above-mentioned conventional problems, and even when a perforation is provided in an arbitrary direction in an existing concrete structure, the back of the perforated cement-based composition does not occur in the perforation. It is possible to provide a shear reinforcement method for a concrete structure, which can be filled with a sufficient amount of anchor bolts and / or deformed reinforcing bars with sufficient strength.

In order to solve the above-described problems, the concrete structure shear reinforcement method according to the present invention has a discharge port at one end when a hole is drilled in the existing concrete structure and the hole is filled with the cementitious composition. Water is introduced from the discharge port into a cylinder, a piston wall movable toward the discharge port in the cylinder, and a cartridge containing cementitious composition powder in the cylinder, and the cartridge The cement-based composition powder and the water are stirred and mixed in the cartridge, and the viscosity after 1 minute of preparation of the cement-based composition is 52 to 81 Pa · s in the cartridge, and the viscosity after 5 minutes of preparation. There Ri Do in 55~82Pa · s, and, after prepared so that also fill the pipe length 3m with internal diameter 13 mm, fitted with a nozzle spout, insert the nozzle into the borehole, Fixie The cement wall is moved to the discharge port side, the cement-based composition is extruded from the discharge port and filled into the perforations, and then a metal reinforcing member is inserted into the perforations, and the cement-based composition in the perforations This is a method for shear reinforcement of a concrete structure, characterized by curing.
This is a shear reinforcement method for concrete structures.

Preferably, the shear reinforcing construction method of the concrete structure of the present invention, the viscosity of the cementitious composition prepared 1 minute after the cartridge is characterized Rukoto such as 52~81Pa · s, a shear of the concrete structure Reinforcement method.

  Here, in the present invention, the viscosity is measured using a Toki Sangyo TVB-10H viscometer and the spindle rotor is measured using H7.

The shear reinforcement method for a concrete structure of the present invention is capable of effectively filling a cementitious composition even in a perforation that is in any direction and has a long depth when shear-reinforcing a concrete structure. In addition, the shear reinforcement of the concrete structure can be performed effectively.
That is, the cementitious composition can be easily and firmly filled in the perforation of the concrete structure to the back of the perforation, and no sagging occurs even when the perforation is lateral or upward.
Accordingly, a decrease in strength can be suppressed, and an inserted anchor bolt material and / or a metal reinforcing member such as a deformed reinforcing bar can be effectively fixed. That is, even after inserting the metal reinforcing member such as the anchor bolt material and / or the deformed reinforcing bar without rotating, these metal reinforcing members are hardly detached and are firmly fixed.

It is sectional drawing which shows the form of one Example of the cartridge used for this invention. FIG. 2 is a diagram of an embodiment schematically showing a state in which the nozzle of the cartridge of FIG. 1 is removed, the aluminum sheet at the discharge port of the cartridge is broken, and water that reacts with the cementitious composition powder is filled. The figure which shows typically one Example of the form which constructs a cement-type composition with respect to the horizontal direction drilling of a concrete structure, and inserts an anchor bar | burr using the sealing gun equipped with the cartridge applied to this invention. is there.

The concrete reinforcing method for a concrete structure according to the present invention will be described in detail below.
In the concrete structure shear reinforcement method of the present invention, when a hole is drilled in an existing concrete structure and the cement-based composition is filled in the drilled hole, a cylinder having a discharge port at one end thereof, Water is introduced from the discharge port to the piston wall movable toward the discharge port and a cartridge containing cementitious composition powder in the cylinder, and the cartridge is vibrated to give the cement The composition composition powder and the water are stirred and mixed to prepare a cement composition in the cartridge to have a viscosity of 50 to 150 Pa · s, and then the discharge port is inserted into the perforation so that the piston wall is Move to the discharge port side and extrude the cement-based composition from the discharge port to fill the hole, and then insert a metal reinforcing member into the hole to harden the cement-based composition in the hole. , It is a shear reinforcement method of construction of the concrete structure.

Specifically, first, a hole for inserting a metallic reinforcing member is drilled in an existing concrete structure.
The hole is a non-through hole and is drilled from one side of the reinforced concrete structure to be reinforced to the other side.
An arbitrary drilling method can be adopted as the drilling method, but a wet drilling method using, for example, a core drill or the like is preferable from the viewpoint of preventing generation of dust.

  The size of the perforation is not particularly limited, but in general, the perforation diameter is 16 to 53 mm and the perforation length is 15 to 30 D in order to increase the shear load resistance while minimizing damage to existing concrete structures. It is preferable that

The cementitious composition is filled in the perforations provided in the concrete structure.
In filling the perforated cementitious composition, the cementitious composition powder used for preparing the cementitious composition is contained in a cartridge, and the cementitious composition is prepared by kneading with water in the cartridge. By inserting the discharge port of the cartridge into the back of the perforation, the cementitious composition can be filled from the back of the perforation.

  The cartridge includes a cylinder having a discharge port at one end, a piston wall movable toward the discharge port in the cylinder, and a cartridge containing cementitious composition powder in the cylinder. Water is introduced from the discharge port, the cartridge is vibrated, the cementitious composition powder and the water are stirred and mixed to prepare a cementitious composition in the cartridge, and then the piston wall is moved to the piston wall. By moving to the discharge port side and extruding the cement-based composition from the discharge port, the cement-based composition can be filled into the perforations in the concrete structure.

  Specifically, the cartridge includes a cylinder 1 having a discharge port 6 at one end, a piston wall 2 movable toward the discharge port 6 in the cylinder 1, and a cement-based composition in the cylinder 1. An object powder 3 is accommodated.

FIG. 1 is a cross-sectional view showing an example of a cartridge used for the shear reinforcement method for a concrete structure of the present invention.
As shown in FIG. 1, the cartridge includes a cylinder 1, a discharge port sealing aluminum sheet 4, a movable piston wall 2, and a cement-based composition powder 3.
The shape of the cylinder 1 is a cylindrical shape or the like, and the shape in which the distance that the piston wall 2 can move in the cylinder 1 along the inner wall of the cylinder 1 toward the discharge port 6 of the cylinder 1 becomes long, that is, the piston wall 2 is A shape that is as close to the discharge port 6 as possible is adopted.
As a result, a necessary amount of the cement-based composition obtained by mixing with the liquid inside the cylinder can be extruded without waste, and the inside of the perforation can be filled to the back.

The cylinder 1 has a discharge port 6 at one end, but the inside of the discharge port 6 is sealed until water A is introduced into the cement composition cartridge.
As a means for sealing the discharge port 6, as shown in FIG. 1, the discharge port 6 is provided with a sealing sheet such as an aluminum sheet 4, a discharge port 6 is provided with a cap, or aluminum. Either means may be used by providing the sheet 4 and sealing with a cap.
By sealing the discharge port 6 in this manner, the inside and the outside air are blocked, and the cement-based composition powder 3 accommodated in the cylinder 1 is prevented from coming into contact with moisture contained in the air. It is possible to extend the life of the cementitious composition powder in the cartridge.

A piston wall 2 that moves toward the discharge port 6 is provided on the opposite side of the discharge port 6 of the cylinder 1, and the shape of the piston wall 2 is that of the outer periphery of the piston wall 2 and the inner wall of the cylinder 1. The shape is such that the inner circumference is equal, and the piston wall 2 is in close contact with the inner surface of the cylinder 1.
As a result, the piston wall 2 can move smoothly along the inner wall of the cylinder 1 and the space between the piston wall 2 and the inner wall of the cylinder 1 is sealed.
For example, most of the piston wall 2 used in the cartridge of the silicone sealant has a truncated cone shape, and if the outer periphery of a part of the piston wall 2 is smaller than the inner periphery of the inner wall of the cylinder 1, A gap is formed between the inner wall of the cylinder 1 and when the piston wall 2 moves in the direction of the discharge port 6 of the cylinder 1, aggregate such as sand contained in the cementitious composition enters the gap. As a result, the movement of the piston wall 2 is hindered.

  Any shape can be adopted as the shape of the discharge port 1 of the cylinder 1 as long as the liquid A which is water can be introduced into the cylinder 1.

A cement-based composition powder 3 is accommodated in the cylinder 1.
Cementitious composition powder and cementitious powder and thickener, cement powder and thickener and non-hydraulic powder, and those obtained by adding a reaction accelerator to these powders are used. can do.
Cementitious powder means powder that hardens in contact with water, preferably Portland cement, calcium silicate, calcium aluminate, calcium fluoroaluminate, calcium sulfoaluminate, calcium aluminoferrite, calcium phosphate, semi At least one kind of powder selected from the group consisting of water or anhydrous gypsum and self-hardening quicklime powder is included, and any commercially available cement can be used, preferably Portland cement is used. be able to.
The cementitious powder preferably has an average particle size of about 10 to 50 μm from the viewpoint of pot life at the time of molding, and has a Blaine specific surface area of 2500 cm ² / g or more from the viewpoint of ensuring high strength. Preferably there is.

The non-hydraulic powder means a powder that does not harden when contacted with water alone, but its components are eluted in an alkaline or acidic state or in a high-pressure steam atmosphere. It is intended to include powders that react with components to form products.
The non-hydraulic powder is at least one selected from the group consisting of calcium hydroxide powder, dihydrate gypsum powder, calcium carbonate powder, slag powder, fly ash powder, silica stone powder, silica sand powder, clay powder and silica fume powder. Kinds of powders are preferred.

Further, the cement-based composition powder 3 contains a thickener mixed with the cement-based powder.
As the thickener, a known thickener can be used, and examples thereof include methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose and the like.
By including the thickener, the resulting cementitious composition can more effectively carry out shear reinforcement of the concrete structure.
The thickener is blended in an amount of 0.01 to 2.0% by mass with respect to 100 parts by mass of the cementitious powder.
If there is too little thickener, it will lead to material separation, and if it is too much, fluidity will deteriorate, and the filling property to perforations may be lowered.

  Furthermore, known compounding agents and additives such as water reducing agents and reaction accelerators can be added to the cement-based powder, and the kneading properties of the mortar can be made favorable for underwater construction. it can.

  In addition, a polymer, a water reducing agent, or the like can be mixed in advance with the liquid A, which is water introduced into the cylinder 1 and reacting with the cementitious composition powder 3, as necessary.

The cement-based composition powder 3 is accommodated in the cylinder 1, but is not filled in the entire cylinder 1, but is filled in a state where a certain cavity 5 is provided.
It is desirable that the cementitious composition powder 3 is filled in a biased manner toward the piston wall 2 when the container of the cartridge is erected, and the cavity 5 appears on the discharge port 6 side.
That is, the cavity 5 is preferably provided between the inner surface of the cylinder 1 on the discharge port 6 side and the end surface of the filled cementitious composition powder 3.

The volume of the cavity 5 is the same as or slightly larger than the volume to which water A that reacts with the volume of the filled cementitious composition powder 3 is to be introduced from the discharge port 6.
The volume of water A that reacts with the cementitious composition powder 3 varies depending on the components of the cementitious composition powder 3 and the desired viscosity of the resulting cementitious composition, and can be set in advance. Is.
Thereby, while increasing the capacity | capacitance of the cementitious composition prepared in the cylinder 1 as much as possible, the introduce | transduced water A and the cementitious composition powder 3 can be stirred and mixed smoothly by vibration.

FIG. 2 is a schematic view showing an embodiment of the usage form of the cartridge of FIG. 1, in which the aluminum sheet 4 sealing the discharge port 6 of the cartridge is broken, and the cement is discharged from the discharge port 6 of the cartridge. It is a figure which shows typically the state with which the water A which reacts with the system composition powder 3 was filled.
For example, the nozzle of the cartridge shown in FIG. 1 is removed, the inner aluminum sheet 4 that has sealed the discharge port 6 is broken, and the water A flows into the cylinder 1 from the discharge port 6 of the cylinder 1. It introduce | transduces into the cavity 5 provided in.
After introducing a predetermined volume of water A into the cavity 5, the discharge port 6 is temporarily sealed by a simple sealing means 7 such as a cap.

Next, vibration is applied to the cartridge, and the cementitious composition powder 3 and the water A are stirred and mixed.
The vibration may be a method of shaking the cartridge up and down, left and right by human power, or a method of applying vibration using a machine. Physically, the cement-based composition powder 3 in the cylinder 1 and the introduced water are introduced. Any method can be adopted as long as A is homogeneously mixed.
Therefore, in order to obtain the cementitious composition 10 by stirring and mixing the cementitious composition powder 3 and the water A, a special apparatus or the like is not required, and it can be simply mixed.

Thus cementitious composition in the cartridge thus prepared is one in which viscosity after 1 min. Preparation cementitious composition is 52~81 Pa · s.
When the viscosity is in this range, the cementitious composition can be filled without causing sag even when the perforation is upward or lateral when the concrete structure is subjected to shear reinforcement.

  The cement-based composition 10 obtained by mixing the cement-based composition powder 3 and the water A in the cylinder 1 by vibration is moved to the discharge port 2 through the piston wall 2 of the cartridge. Thus, it is extruded and applied to a desired perforated portion 31 in the concrete structure 30.

The cementitious composition can be injected into perforations of any orientation, such as upward or sideways.
When the drilling or drilling is performed by a dry method such as a concrete drill, the chip dust is filled after cleaning and removing the dust.
In addition, in the case of drilling by a wet method such as a core drill, the hole is injected after being dried.

In particular, in order to extrude the cement-based composition obtained from the discharge port 6, as shown in FIG. 3, the cartridge is mounted on a discharge machine generally called a sealing gun or a caulking gun. it can.
The sealing gun or caulking gun can be used as a cartridge gun for mounting a cartridge.
The cartridge is used for construction, with the sealing means 7 such as a cap removed, the tip of the nozzle 11 cut and attached to the discharge port 6 and attached to the cartridge gun. FIG. 3 schematically shows such a state.

When the cartridge is mounted on the cartridge gun, the movement of the cartridge mounted with the nozzle 11 is restricted by the tip support member 21 so that it does not move in the direction of movement of the piston wall 2, and the body support member 22. So that the cartridge is held. The tip support member 21, the body support member 22, or a body 23 described later can be integrally formed as necessary.
The body support member 22 is connected to the body 23 on the side opposite to the side connected to the tip support member 21. Further, a grip portion 24 is fixed to the body 23 so that a lever 25 that can move around a fulcrum 29 of the body can be easily operated with one hand. An interlocking portion 26 that is interlocked with the movement of the lever 25 is provided, and the pressing shaft 27 moves in the cartridge direction by the movement of the interlocking portion 26. The pressing shaft 27 can be moved only in the cartridge direction by the operation of the interlocking portion 26. The piston wall 2 is in contact with the pressing portion 28 of the pressing shaft 27 of the gun 20 on the outside air side, that is, on the surface side opposite to the surface of the piston wall 2 in contact with the hydraulic composition 10.

As shown in FIG. 3 (a), the nozzle 11 of the gun is inserted into the back part of the perforation 21 of the concrete structure 30, and the cementitious composition 10 is discharged into the perforation (FIG. 3 (b). )). Specifically, the gripping part 24 and the lever 25 of the cartridge gun equipped with the cartridge are gripped by hand, and the lever 25 is pulled toward the gripping part 24 around the fulcrum 29, so that the lever 25 is moved to the lever 25 at the fulcrum 29. The interlocking portion 26 configured to be interlocked moves in the nozzle direction, and thereby the pressing shaft 27 connected to the interlocking portion 26 also moves. Then, the pressing portion 28 integrated with the pressing portion 27 is moved in the nozzle direction, the piston wall 2 is similarly moved in the nozzle 11 direction, and the cementitious composition 10 in the cartridge is moved to the nozzle 11. Thus, it is discharged and filled from inside the perforation (FIG. 3B).
The lever 25 and the interlocking portion 26 are configured to automatically return to their original positions. However, when the interlocking portion 26 returns, the pressing shaft 27 is configured not to move, and the lever 25 is moved to the gripping portion 24 side. Each time it is pulled, the pressing shaft 27 moves only in the direction of the cartridge, and the cement-based composition 10 is discharged from the back of the perforations, and the cement-based composition is filled from the back of the perforations.

  By adjusting the nozzle shape according to the perforation, regardless of the perforation direction, a cement-based composition adjusted to a desired water-cement ratio gradually from the back of the perforation of the concrete structure 30 can be obtained. Thus, it can be easily constructed in the perforation.

In this way, after the cementitious composition is injected and filled into the perforations, a metal reinforcing member such as an anchor bolt material or deformed reinforcing bar 32 is inserted into the perforations (FIG. 3C).
The anchor muscle 32 is preferably inserted slowly without rotating, and can be inserted by hand, for example, but depending on the size of the anchor muscle 32, insertion by hand may be difficult. It can also be inserted by hammering. Even in such a case, the anchor bar 32 is driven with a hammer without rotating.

  Thus, the shear reinforcement method of the concrete structure of the present invention is such that, even if the drilling of the concrete structure is upward, sideways, etc., the cementitious composition is easily generated in any drilling, almost no dust is generated, While being able to construct easily, it becomes possible to simply carry out repair construction without variations including upward construction and lateral construction using the cartridge.

(Examples 1-2 , Comparative Examples 1-4 , Reference Example 1 )
Assuming the case where the perforations are provided sideways in the concrete structure, polypropylene pipes having an outer diameter of 15 mm, an inner diameter of 13 mm, and a length of 3 m were installed horizontally, and the injectability was evaluated with each filler shown in Table 1. .
Each filler was prepared as follows.
The prepared cementitious composition powder (trade name Cemfors: manufactured by Sumitomo Osaka Cement Co., Ltd.) 3 was filled into the cartridge shown in FIG. 1 so that the cavity 5 was formed inside the cartridge. The cementitious composition powder contains 0.1 part by mass of methylcellulose with respect to 100 parts by mass of cement powder. As shown in FIG. 2, the cement 3 to be filled and the cavity 5 (substantially the same volume as the water to be blended) have a water-cement mass ratio of the obtained cementitious composition as shown in Table 1 below. It was adjusted. Water A was added to the cavity 5 of the cartridge, the discharge port 6 was sealed, and the cartridge was well stirred by moving it up and down to prepare a mortar. The usual composition of ceme force was measured by combining 18.7 parts by weight of water with respect to 100 parts by weight of the cementitious composition powder and changing the amount of water by weight shown in Table 1 with respect to the standard amount of water.
Viscosity measurement was started 1 minute after the kneading of each mortar, and the values of the viscometer (Toki Sangyo TVB-10H type viscometer) after 1 minute and 5 minutes from the start are shown in Table 1.
The cartridge in which the mortar was prepared was mounted on the cartridge gun shown in FIG.

Further, in Comparative Example 1, in place of the ceme force of Example 1, 200 parts by weight of silica sand 6 and 60 parts by weight of water were kneaded according to JIS R 5201 with respect to 100 parts by weight of ordinary Portland cement. Loaded and evaluated for injectability.
In Comparative Example 4, a commercially available grout material (trade name: Filcon R, manufactured by Sumitomo Osaka Cement Co., Ltd.) was kneaded with 100 parts by weight of cementitious composition powder and 18 parts by weight of water with a hand mixer for 2 minutes. The cartridge was loaded and the injectability was evaluated.

In Examples 1 and 2 and Comparative Examples 1 and 2 and Reference Example 1 , a nozzle is installed in the hole 31 using a cartridge gun (FIG. 3A), The filler was extruded from the nozzle, and the inside of the perforation was sequentially filled from the back (FIG. 3B). Specifically, as described above, the nozzle 11 of the gun is inserted into the back of the perforation, and the piston wall 2 is moved by pulling the lever 25, so that the nozzle 11 moves the hole from the back of the hole. Filled.
After the injection, the insertion bar (deformed bar D16: material SD295A) was inserted without rotating.

  From Table 1, the shear reinforcement method for a concrete structure according to the present invention has a long perforation by providing a perforation in the concrete structure and filling the perforation with a cementitious composition using a cartridge. It can also be seen that this is an effective shear reinforcement method for concrete structures without causing sagging.

  As described above, the concrete structure shear reinforcement method of the present invention can be effectively applied to bridges, revetments, tunnels, retaining walls, dams, etc., which are existing concrete structures, widening, shear reinforcement, and facility construction. it can.

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Piston wall 3 Hydraulic composition powder 4 Aluminum sheet 5 Cavity 6 Discharge port 7 Sealing means A Liquid 10 Hydraulic composition 11 Nozzle 20 Cartridge gun 21 Tip support member 22 Body support member 23 Body 24 Grasping part 25 lever 26 interlocking part 27 pressing shaft 28 pressing part 29 fulcrum 30 concrete structure 31 perforation 32 metal reinforcing member B water

Claims (1)

A cylinder having a discharge port at one end and a piston wall movable toward the discharge port in the cylinder when a hole is drilled in the existing concrete structure and the cement-based composition is filled in the hole. Then, water is introduced into the cartridge containing the cementitious composition powder in the cylinder from the discharge port, and the cartridge is vibrated to stir and mix the cementitious composition powder and the water. in Te viscosity 52 to 81 Pa · s for cementitious compositions prepared 1 minute after in the cartridge, preparation viscosity after 5 minutes Ri Do in 55~82Pa · s, and a length of 3m at the inner diameter 13mm pipe after preparing the so that also filled in, attaching the nozzle to the spout, and inserting the nozzle into the borehole, the move the piston wall spout side cementitious composition from said discharge outlet Extrude and punch Filling the hole,
Next, a metal reinforcing member is inserted into the perforation to harden the cementitious composition in the perforation, and a method for shear reinforcement of a concrete structure.

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