JP2011256640A - Shear reinforcement method for existing concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shear reinforcement method for existing concrete structure, capable of increasing yield strength against shear stress.SOLUTION: In an inventive shear reinforcement method for existing concrete structure, a reinforcement member 4 is provided in a bottomed hole 3 drilled from one face 2 of an existing concrete structure 1A and the clearance between an inner wall surface 11 of the bottomed hole 3 and the reinforcement member 4 is filled with a filler 6. The bottomed hole 3 is formed to be provided with a base hole part 10 opened to the one face 2 and an engaging recess 13 extending from the inner wall surface 11 of the base hole part 10 in a direction of intersecting a center line 12 of the hole of the base hole part, the reinforcement member 4 is formed to be provided with an engaging part 22 engaging with an engaging surface 21 of the engaging recess 13, and the engaging part 22 of the reinforcement member 4 is engaged with the engaging surface 21, with the filler 6 being filled between the reinforcement member 4 and the inner wall surface 11 of the bottomed hole 3.

Description

  The present invention relates to a method for shear reinforcement of an existing concrete structure capable of improving the yield strength against shear stress.

Conventionally, a shear reinforcement method for an existing concrete structure in which a reinforcing member is installed in a bottomed hole drilled from one surface of an existing concrete structure such as a box culvert is known (for example, see Patent Document 1).
In the shear reinforcement method of Patent Document 1, the opening side and the bottom side of the bottomed hole are widened, one end portion of the reinforcing member is positioned within the opening-side widened portion of the bottomed hole, and the other end portion of the reinforcing member is the bottomed hole. And the filler is filled between the reinforcing member and the inner wall of the bottomed hole.

Japanese Patent No. 4157510

However, in the concrete structure provided with the shear reinforcement structure by the shear reinforcement method of Patent Document 1, the adhesion force between the reinforcing member and the filler resists the shear stress, so the adhesion force between the reinforcing member and the filler is not sufficient. If the filler is destroyed, the integrity of the reinforcing member and the filler is lost and the reinforcing member slides, so that the tensile force applied to the concrete structure is not transmitted to the reinforcing member, and the concrete structure The present invention provides a method for shear reinforcement of an existing concrete structure capable of improving the resistance to shear stress.

According to the shear reinforcement method for an existing concrete structure according to the present invention, the reinforcing member is installed in the bottomed hole drilled from one surface of the existing concrete structure, and the filler is the inner wall surface of the bottomed hole and the reinforcing member. In the method of shear reinforcement of an existing concrete structure filled so as to fill the gap between the base hole and the base hole that opens on one side and the inner wall of the base hole, Forming a locking recess extending in a direction crossing the center line, and forming a reinforcing member having a locking portion locking to the locking surface of the locking recess, Since the locking portion is locked to the locking surface and the filler is filled between the reinforcing member and the inner wall surface of the bottomed hole, the tensile force applied to the concrete structure is passed through the locking surface and the locking portion. Is transmitted to the reinforcing member and the resistance to shear stress is improved. It becomes possible to provide the Nkurito structure.
Using a reinforcing member with an external thread at one end and a locking part at the other end, and a fixing means with a fixing plate and nut, insert the reinforcing member into the bottomed hole from the other end Then, with the locking portion of the reinforcing member locked to the locking surface of the locking recess, one end of the reinforcing member protruding from the opening of the base hole is passed through the through hole of the fixing plate and screwed into the male screw portion. By fixing the reinforcing member to one side of the existing concrete structure by pressing the fixing plate with the attached nut and bringing the fixing plate into contact with one side of the existing concrete structure, by tightening the nut The reinforcing member can be easily and stably fixed to one surface of the existing concrete structure to facilitate the installation work of the reinforcing member, and the fixing plate and one surface of the concrete structure are in a pressure contact state to reinforce. The existing connector between the locking part of the member and the fixing plate The portion of the cleat structure can Prestressing, it is possible to improve the resistance to shearing stress.
According to the shear reinforcement method for an existing concrete structure according to the present invention, the reinforcing member is installed in the bottomed hole drilled from one surface of the existing concrete structure, and the filler is the inner wall surface of the bottomed hole and the reinforcing member. In the method for shear reinforcement of an existing concrete structure filled so as to fill a gap between the base hole, a base hole that opens on one surface and a base hole that is provided on each of the opening side and the bottom side are provided as bottomed holes. Each of which is provided with each locking recess extending from the inner wall surface of the base hole portion in a direction intersecting the center line of the hole of the base hole portion. Forming a locking portion for locking, each locking portion of the reinforcing member is respectively locked to the locking surface of the corresponding locking recess, and the filler is formed between the reinforcing member and the inner wall surface of the bottomed hole. Since it was filled during That tension is transmitted to the reinforcing member via a plurality of locking surfaces and the locking portion, it is possible to provide a concrete structure that improves proof stress against shear stress.
After the base hole is formed, the water guide pipe inserted into the base hole and extending along the center line of the base hole is provided at one end of the water guide pipe, and the pressure is increased in the direction perpendicular to the center line of the water guide pipe. Since the locking recess is formed using a water jet equipped with a high-pressure water injection hole for injecting water, the locking portion of the reinforcing member locks to ensure the movement of the reinforcing member toward the opening side of the bottomed hole It is possible to easily form a locking surface that is perpendicular to the center line of the base hole that can be prevented.
After forming the base hole, use a grinder device equipped with a cutting part that rotates around the rotation axis at the tip of the rotation axis, and rotate the rotation axis while contacting the rotating cutting part to the inner wall surface of the base hole. Since the locking recess is formed by moving the shaft in a direction intersecting the rotation center line of the shaft, a locking surface orthogonal to the center line of the base hole can be formed more easily.
Since the existing concrete structure is formed of a reinforced concrete structure and the locking surface is formed of a reinforcing bar exposed on the inner wall surface of the locking recess, the reinforcing bar and the reinforcing member are formed by the tensile force applied to the concrete structure. Further, the compressive force applied to the concrete positioned between the reinforcing bar forming the locking surface and one surface of the existing concrete structure can be dispersed by the reinforcing bar, so that the resistance to shear stress can be improved.

Sectional drawing which shows a concrete structure (embodiment 1). Explanatory drawing which shows the formation method of a bottomed hole (embodiment 1). Explanatory drawing which shows the formation method of a latching recessed part (embodiment 1). It is a figure which shows the high voltage | pressure water injection part of the water jet used when forming a base hole part, (a) is a perspective view, (b) is a front view (Embodiment 1). The perspective view which shows the high pressure water injection part of the water jet used when forming a latching recessed part (Embodiment 1). The perspective view which shows a reinforcement member and a fixing means (Embodiment 1). It is a figure which shows a latching recessed part, (a) is sectional drawing, (b) is AA sectional drawing of (a) (Embodiment 2). It is a figure which shows a latching recessed part, (a) is sectional drawing, (b) is AA sectional drawing of (a) (Embodiment 3). Sectional drawing which shows a concrete structure (Embodiment 7). Sectional drawing which shows a concrete structure (Embodiment 8). Explanatory drawing which shows the formation method of a latching recessed part (9th Embodiment).

Embodiment 1
As shown in FIG. 1, a concrete structure 1 according to Embodiment 1 has a bottomed hole 3 drilled from one surface 2 of an existing concrete structure such as a reinforced concrete structure such as a bridge pier or a box culvert. The existing concrete structure 1A after forming the bottomed hole, the reinforcing member 4 installed in the bottomed hole 3, the fixing means 5 for fixing the reinforcing member 4 to the existing concrete structure 1A, and the reinforcing member 4 are installed. And a filler 6 filled in the bottomed hole 3 formed.

  The bottomed hole 3 includes a base hole portion 10 that opens on one surface 2 (for example, the inner surface of the box culvert) of the existing concrete structure 1A, and an inner wall surface 11 of the bottom portion 10a of the base hole portion 10 to the base hole portion 10. And a locking recess 13 extending in a direction orthogonal to the center line 12 of the hole. The hole diameter of the base hole portion 10 is formed to be larger than the length in the longitudinal direction of a locking member 17 described later.

As shown in FIG. 1 and FIG. 6, the reinforcing member 4 includes a bar-shaped reinforcing portion 15 formed of, for example, a straight metal rod and a locking member 17 provided at the other end portion 16 of the rod-shaped reinforcing portion 15. With.
The locking member 17 is formed of, for example, a plate material in which one end side in the longitudinal direction of a rectangular metal flat plate material is formed in a semicircular shape. A through hole 19 that penetrates the plate material is formed in one end portion 18 of the locking member 17, and the other end portion 16 of the rod-like reinforcing portion 15 is engaged with the rod-like reinforcing portion 15 in a state where the other end portion 16 is fitted in the through-hole 19. The reinforcing member 4 having a configuration in which the locking member 17 is fixed to the other end portion 16 of the rod-like reinforcing portion 15 is formed by joining the stopping member 17 by joining means such as welding or screws.
Thus, in the locking member 17 fixed to the other end portion 16 of the rod-shaped reinforcing portion 15, the plate portion between the other end 20 in the longitudinal direction of the locking member 17 and the rod-shaped reinforcing portion 15 is the locking recess 13. It functions as a locking portion 22 that locks to the locking surface 21.
The locking surface 21 is formed by the outer peripheral surface of the reinforcing bar 24 exposed on the inner wall surface 13 a on the side close to the opening 23 of the bottomed hole 3 in the locking recess 13.
A male screw portion 26 is formed at one end portion 25 of the rod-shaped reinforcing portion 15.

As shown in FIG. 1; FIG. 6, the fixing unit 5 includes a fixing plate 30 and a nut 31.
The fixing plate 30 is formed of, for example, a circular metal plate having a diameter larger than the diameter of the opening 23 of the bottomed hole 3. The fixing plate 30 includes a central through hole 32 that passes through the center of the plate surface of the circular metal plate, and one or more peripheral through holes that pass through the plate surface of the circular metal plate, for example, two peripheral through holes 33; And are formed.

  The reinforcing member 4 is inserted into the bottomed hole 3 from the other end 16 (the other end) side, and the locking portion 22 of the reinforcing member 4 is locked to the locking surface 21 of the locking recess 13. The reinforcing member 4 is installed in the bottomed hole 3 in a state where movement of the bottomed hole 3 toward the opening 23 is prevented. In this state, one end portion 25 of the bar-shaped reinforcing portion 15 of the reinforcing member 4 is passed through the central through hole 32 of the fixing plate 30, and a nut 31 is screwed and fastened to the male screw portion 26 of the bar-shaped reinforcing portion 15. Accordingly, the fixing plate 30 is pressed by the nut 31 to contact (pressure contact) one surface 2 of the existing concrete structure 1A to cover the opening 23 of the bottomed hole 3, and the reinforcing member 4 is provided to the existing concrete structure 1A. It is fixed to one side 2. Furthermore, a filler 6 filled in the bottomed hole 3 through a filling hole of the fixing plate 30 fixed to one surface 2 of the existing concrete structure 1A and solidified is provided. In this case, for example, one of the two peripheral through holes 33; 34 may be used as a filling hole and the other may be used as an air escape hole. For example, if the peripheral through hole 33 located below the center line 4a of the reinforcing member 4 is used as a filling hole and the filler 6 is filled from the lower side in the bottomed hole 3, the peripheral through hole Since air easily escapes from 34, the filler 6 can be densely filled into the bottomed hole 3. It should be noted that the end opening of the filler supply pipe (not shown) may be installed in the bottomed hole 3 and the filler 6 may be supplied from the end opening of the filler supply pipe. In this case, the front end opening of the filler supply pipe may be inserted into the bottomed hole 3 through the opening 23 of the bottomed hole 3, or bottomed through one of the peripheral through holes 33; 34. It may be inserted into the hole 3.

  That is, the reinforcing member 4 is inserted into the bottomed hole 3 opened on the one surface 2 of the existing concrete structure 1A after the bottomed hole is formed, and the locking portion 22 becomes the locking surface 21 of the locking recess 13. It is installed in a state in which movement to the opening 23 side of the bottomed hole 3 is prevented by being locked, and is fixed to the one surface 2 of the existing concrete structure 1A by the fixing means 5, and is filled 6 becomes the concrete structure 1 having the shear reinforcement structure in a state of being attached to the inner wall surface 11 of the bottomed hole 3 and the reinforcing member 4. In FIG. 1 and FIG. 2, the concrete structure 1 which employ | adopted the shear reinforcement structure of this invention is illustrated in the existing box culvert formed with the reinforced concrete structure, Reinforcement 24 shows a vertical reinforcement, Reinforcement 27 shows a horizontal reinforcement. However, the reinforcing bar 24 functioning as the locking surface 21 may be a reinforcing bar incorporated in an existing reinforced concrete structure which is to adopt the shear reinforcement structure of the present invention.

Next, the construction method of the concrete structure 1 provided with the shear reinforcement structure is demonstrated.
The construction method includes a bottomed hole forming step, a reinforcing member installation step, and a filler filling step.

  In the bottomed hole forming step, first, the base hole portion 10 of the bottomed hole 3 is formed using the first water jet 40. That is, as shown in FIG. 2A, high-pressure water W of 200 MPa, for example, is sprayed on one surface 2 of the existing concrete structure to form the base hole 10 that extends into the existing concrete structure. When the base hole portion 10 reaches a position beyond the target reinforcing bar 24 as shown in FIG. 2B, the bottomed hole 3 is used using the second water jet 41 as shown in FIG. The locking recess 13 is formed. In other words, the high pressure water W is sprayed onto a part 11a of the inner wall surface 11 at the bottom 10a of the base hole 10 to extend to the back side of the target reinforcing bar 24 when viewed from one surface 2 of the existing concrete structure 1A. A recess 13 is formed. In this case, the locking recess 13 is formed such that the back side of the target reinforcing bar 24 is exposed on the inner wall surface 13 a on the side close to the opening 23 of the locking recess 13. The formation work of the bottomed hole 3 includes a reinforcing bar arrangement diagram of the existing concrete structure, image information obtained by a photographing means such as a borehole camera outside the figure for photographing the inside of the hole in the middle of the formation work of the bottomed hole 3 and the like. And confirming the position of the target reinforcing bar 24.

Although not shown, the water jets 40; 41 as the perforating device for injecting the high-pressure water W to perforate the bottomed hole 3 are not shown, but the high-pressure water from the high-pressure water generating device, the injection operation unit, and the high-pressure water generating device. And a high-pressure water supply passage such as a pressure-resistant hose for supplying the fuel to the injection operation unit.
The high-pressure water generator sends high-pressure water obtained by mixing water supplied from a water source and compressed air to a high-pressure water supply path.
The injection operation unit includes a high-pressure water receiving port (not shown), a high-pressure water injection unit 42 as shown in FIG. 2A, and a water conduit 43 that sends high-pressure water received at the high-pressure water receiving port to the high-pressure water injection unit 42. And an unillustrated on-off valve for opening and closing the conduit of the water conduit 43, and an unillustrated operating lever for operating the on-off valve.
The high-pressure water injection unit 42 is formed by an injection component (nozzle head) with an injection hole 44 that is detachably attached to the terminal end of the water conduit 43 or an injection hole 44 formed at the terminal end of the water conduit 43.
The water jets 40; 41 are adjusted so that the pressure value of the high-pressure water injected through the high-pressure water injection unit 42 is adjusted to a pressure value at which the concrete can be cut and the reinforcing bars cannot be cut. Use.

The water jet 40; 41 may be a high-pressure water injection unit 42 having one injection hole 44 or a plurality of high-pressure water injection units 42 having an injection hole 44.
As the first water jet 40 for forming the base hole portion 10 of the bottomed hole 3, as shown in FIG. 2A, the injection hole 44 having one high-pressure water injection portion 42 is used. For example, the center line 44 a of the injection hole 44 and the center line 43 a of the conduit pipe 43 are located on the same line, and the high-pressure water W is injected through the injection hole 44 in the extending direction of the center line of the injection hole 44. The thing of the structure used is used. In this case, the base hole portion 10 is formed by injecting high-pressure water from the injection hole 44 while swinging the water guide pipe 43 in the vertical direction (or left-right direction) with the injection hole 44 directed in the direction in which the base hole portion 10 is drilled. To go.
Further, as the first water jet 40, for example, as shown in FIG. 4, one having a high-pressure water injection section 42 such as a nozzle plate having a plurality of injection holes 44 may be used. The first water jet 40 is a cylindrical high-pressure water injection section 42 configured to receive a water flow of high-pressure water and rotate around the center line 43a of the water conduit 43, or a motor (not shown). And a cylindrical box high-pressure water injection unit 42 configured to be rotatable about the center line 43a of the water guide pipe 43 as a rotation center. For example, the one having two through holes that function as the injection holes 44 may be used. In this case, the base hole portion 10 can be easily formed by injecting the high-pressure water W from the two injection holes 44 while rotating the high-pressure water injection portion 42 in at least one direction X.

As the 2nd water jet 41 used in order to form the latching recessed part 13 of the bottomed hole 3, as shown in FIG. 5, for example, the center line 44a of the injection hole 44 and the center line 43a of the pipe of the water conduit 43 are used. And the high-pressure water W provided with the high-pressure water injection portion 42 having a configuration in which the high-pressure water W is injected in a direction orthogonal to the extending direction of the center line 43a of the water guide pipe 43 through one injection hole 44. In this case, for example, the high-pressure water injection unit 42 is formed by a cylindrical box extending in a direction orthogonal to the center line 43 a of the water conduit 43, and the injection hole 44 is formed in the one end closing plate 45 of the cylindrical box. That is, the injection hole 44 includes a through hole formed in the one end closing plate 45 provided so as to be orthogonal to a line orthogonal to the center line 43 a of the water conduit 43.
Using such a second water jet 41, first, as shown in FIG. 3 (a), the injection hole 44 of the high-pressure water injection part 42 is made into a part 11a of the inner wall surface 11 in the bottom part 10a of the base hole part 10. Next, as shown in FIG. 3 (b), the high pressure water W is supplied from the injection hole 44 while the high pressure water injection portion 42 is reciprocatingly rotated within a predetermined angle range Y around the center line 43a of the water conduit 43. The locking recess 13 is formed by spraying.
Further, as the second water jet 41, one provided with a high-pressure water injection section 42 having a configuration in which a plurality of injection holes 44 are formed in the one end closing plate 45 may be used.

In the reinforcing member installation step, the reinforcing member 4 is inserted into the bottomed hole 3 from the side of the locking member 17 through the opening 23 of the bottomed hole 3, and the locking portion 22 of the reinforcing member 4 is locked. One end portion 25 of the reinforcing member 4 that protrudes from the one surface 2 of the existing concrete structure 1 </ b> A beyond the opening 23 in a state of being engaged with the reinforcing bar 24 as the engaging surface 21 exposed on the inner wall surface 13 a of the recess 13. Is passed through the central through hole 32 of the fixing plate 30, and the nut 31 is screwed and fastened to the male threaded portion 26 of the reinforcing member 4, so that the fixing plate 30 is positioned around the opening edge of the opening 23 of the existing concrete structure 1A. The opening 23 of the base hole 10 is covered by contacting the surface 2 of the base hole 10.
In this case, since the fixing plate 30 and the one surface 2 of the existing concrete structure 1A are in a pressure contact state, the reinforcing member 4 is fixed to the one surface 2 of the existing concrete structure 1A. A portion 1B (see FIG. 1) of the existing concrete structure 1A between the locking portion 22 and the fixing plate 30 is pressed and compressed by the locking portion 22 of the reinforcing member 4 and the fixing plate 30, and the existing structure 1A is fixed. Since the prestress is introduced into the portion 1B of the concrete structure 1A, the proof stress of the portion 1B against the shear stress is improved, and the proof strength of the concrete structure 1 with respect to the shear stress is improved.

In the filling material filling step, the filling material 6 is injected into the bottomed hole 3 by connecting the filling port of the filling material filling device (not shown) to the filling hole and driving the pump of the filling material filling device. Thereby, the filler 6 is filled in the bottomed hole 3.
The concrete structure 1 provided with the shear reinforcement structure is thus completed.

According to the shear reinforcement method for an existing concrete structure according to the first embodiment, the bottomed hole 3 having the base hole portion 10 and the locking recess 13 is formed, the locking portion 22 is formed in the reinforcing member 4, and By locking the locking portion 22 of the reinforcing member 4 inserted into the bottom hole 3 to the reinforcing bar 24 as the locking surface 21 of the locking recess 13, the reinforcing member 4 moves toward the opening 23 side of the bottomed hole 3. Is installed in such a manner that the concrete between the reinforcing bar 24 and the one surface 2 is restrained, the tensile force applied to the concrete structure 1 is the reinforcing bar 24 as the locking surface 21. And the concrete structure 1 which is transmitted to the reinforcing member 4 through the locking portion 22 and has improved resistance to shear stress is obtained.
Further, since the locking surface 21 is formed by the outer peripheral surface of the reinforcing bar 24 exposed on the inner wall surface 13a on the side close to the opening 23 of the bottomed hole 3 in the locking recess 13, the reinforcing bar 24 forming the locking surface 21 is formed. And the compressive force applied to the concrete positioned between the two surfaces 2 can be dispersed by the reinforcing bars 24, and the yield strength against shear stress can be improved.
According to the shear reinforcement method for the existing concrete structure 1 according to the first embodiment, after forming the base hole 10, the water guide pipe 43 is inserted into the base hole 10 and extends along the center line 12 of the base hole 10. And a second water jet 41 provided at one end of the water conduit 43 and provided with a high pressure water injection hole 44 for injecting high pressure water W in a direction orthogonal to the center line 43a of the water conduit 43. Since the concave portion 13 is formed, the locking portion 22 of the reinforcing member 4 is locked and is orthogonal to the center line 12 of the base hole portion 10 that can reliably prevent the bottomed hole 3 of the reinforcing member 4 from moving toward the opening 23 side. Such a locking surface 21 can be easily formed.
According to the shear reinforcement method for the existing concrete structure 1 of the first embodiment, since the fixing means 5 is used, the reinforcing member 4 can be easily and stably attached to the one surface 2 of the existing concrete structure 1A by fastening the nut 31. The reinforcing member 4 can be easily installed. In addition, the fixing plate 30 and the one surface 2 of the existing concrete structure 1A are brought into pressure contact with each other, so that the portion 1B of the existing concrete structure 1A between the locking portion 22 of the reinforcing member 4 and the fixing plate 30 is formed. Prestress can be introduced and the concrete structure 1 which can improve the yield strength with respect to a shear stress can be formed.
According to the shear reinforcement method for the existing concrete structure 1 according to the first embodiment, the fixing plate 30 includes the filling hole for filling the filler 6 in the bottomed hole 3, and the bottomed hole in which the reinforcing member 4 is installed. 3 is provided, the filling material 6 can be filled easily, the adhesion between the inner wall surface 11 of the bottomed hole 3 and the filling material 6, and the filling material 6 and the reinforcement. Since the shear stress is transmitted to the reinforcing member 4 by the adhesive force with the member 4, the concrete structure 1 capable of improving the proof stress against the shear stress can be formed.

Embodiment 2
A plurality of locking recesses 13 extending from the inner wall surface 11 of the bottom portion 10a of the base hole portion 10 in a direction intersecting with the center line 12 of the hole of the base hole portion 10, preferably in a direction orthogonal to the center line 12 of the hole is provided. May be. For example, as shown in FIG. 7, the locking recesses 13 may be provided at positions 180 degrees apart from each other on the inner peripheral surface of the bottom 10 a of the base hole 10.
In this case, for example, after forming one locking recess 13 using the second water jet 41 shown in FIG. 5, the water conduit 43 of the second water jet 41 is rotated around the center line 43 a of the water conduit 43. Then, the other locking recess 13 may be formed by rotating high-pressure water W from the injection hole 44 after rotating 180 degrees.
Further, the reinforcing member 4 used in this case can be moved to the other end portion 16 of the rod-shaped reinforcing portion 15 in a direction perpendicular to the center line of the rod-shaped reinforcing portion 15 by a biasing force of a spring not shown in the figure. What has the structure provided with the stop member 17 should just be used. For example, after passing through the base hole 10, the spring moves in a direction perpendicular to the center line of the rod-shaped reinforcing portion 15 by a biasing force of the spring and the like and a state orthogonal to the center line of the rod-shaped reinforcing portion 15 by a stopper or the like not shown What is necessary is just to use the reinforcement member 4 of the structure provided with the locking member 17 maintained in this.
In this case, the reinforcing member 4 is locked to the locking surface 21 at two points by the locking members 17; 17 separated from each other by 180 °, and the reinforcing member 4 can be locked to the locking surface 21 stably. It is preferable.

Embodiment 3
As shown in FIG. 8, the locking recess 13 may be constituted by a widened hole portion having a diameter larger than that of the base hole portion 10 provided in the bottom portion 10 a of the base hole portion 10. For example, the engaging recess 13 may be formed of a widened hole formed by a hole concentric with the base hole 10 such that the centerline of the widened hole and the centerline 12 of the base hole 10 are the same.
In this case, the positioning operation between the locking member 17 and the locking recess 13 of the reinforcing member 4 is not necessary, so that the installation operation of the reinforcing member 4 can be performed more easily.

Embodiment 4
The reinforcing member 4 used in the case of using the fixing unit 5 only needs to have a configuration in which the one end portion 25 has the male screw portion 26 and the other end portion 16 includes the locking portion 22. For example, a round bar material that has a male screw portion at one end and is bent at the other end to form a locking portion may be used as the reinforcing member 4.

Embodiment 5
Further, one end portion 25 of the reinforcing member 4 protruding from the opening 23 of the base hole portion 10 in a state where the locking portion 22 of the reinforcing member 4 is locked to the locking surface 21 of the locking recess 13 is provided in the existing concrete structure 1A. As fixing means for fixing to one surface 2 of the steel sheet, fixing means including the fixing plate 30 and fixing means such as anchor bolts for fixing the fixing plate 30 to one surface 2 of the existing concrete structure 1A is used. Also good. In this case, one end portion 25 of the reinforcing member 4 protruding from the opening 23 of the base hole portion 10 in a state where the locking portion 22 of the reinforcing member 4 is locked to the locking surface 21 of the locking recess 13 is connected to the fixing plate 30. After passing through the central through hole 32, the fixing plate 30 is fixed to one surface 2 of the existing concrete structure 1A by fixing means, and the one end 25 of the reinforcing member 4 and the fixing plate 30 are temporarily fixed with an adhesive or the like. Then, the filler 6 may be filled. In this case, since the reinforcing member 4 can be used as the reinforcing member 4, a bar material such as a reinforcing bar formed in the locking portion by bending the other end portion 16 without providing the male screw portion at the one end portion 25 can reduce the cost of the reinforcing member 4.

Embodiment 6
The fixing unit 5 may not be used. The reinforcing member 4 used in this case only needs to have a configuration in which the other end portion 16 includes the locking portion 22. For example, since the reinforcing member 4 can be used as a reinforcing member 4 such as a reinforcing bar 4 which is not provided with a male threaded portion at the one end 25 and is bent at the other end 16 to form a locking portion, the cost of the reinforcing member 4 can be reduced.
In this case, the locking portion 22 of the reinforcing member 4 inserted into the bottomed hole 3 is locked to the locking surface 21 of the locking recess 13 so that the reinforcing member 4 moves toward the opening 23 side of the bottomed hole 3. In a state where the movement is prevented, the bottomed hole 3 is filled with the filler 6 to solidify the filler 6, or the bottomed hole 3 is filled with the filler 6 in advance and then present. The reinforcing member 4 is inserted into the bottom hole 3 and the locking portion 22 of the reinforcing member 4 is locked to the locking surface 21 of the locking recess 13 so that the reinforcing member 4 moves toward the opening 23 side of the bottomed hole 3. What is necessary is just to make it the structure made into the state blocked | prevented.

Embodiment 7
As shown in FIG. 9, the reinforcing member 4 having the enlarged diameter end portions 60; 60 that are larger than the diameter of the rod-shaped reinforcing portion 15 at both ends of the rod-shaped reinforcing portion 15 may be used. And each enlarged diameter end part 60; 60 is formed in the same shape. A boundary portion between the enlarged diameter end portion 60 and the rod-shaped reinforcing portion 15 is formed on the curved locking portion 22 that engages with the peripheral surface of the reinforcing bar 24 as the locking surface 21. In this case, for example, the locking portion 22 on the one enlarged diameter end portion 60 side is locked to the outer peripheral surface (locking surface 21) on the other surface 61 side located on the opposite side to the opening 23 of the reinforcing bar 24. In this state, the filler 6 may be filled from the bottom side of the bottomed hole 3 hole. If such a reinforcing member 4 is used, the engagement between the outer peripheral surface of the reinforcing bar 24 as the locking surface 21 and the locking portion 22 can be strengthened.

Embodiment 8
As shown in FIG. 10, in an existing reinforced concrete structure in which reinforcing bars 27 such as vertical bars (main bars) are arranged on one surface 2 side and the other surface 61 side, for example, a rod-shaped reinforcing portion 15 A reinforcing member 4 such as a reinforcing bar is used which has locking portions 22; 22 formed by bending both ends of the rod-shaped reinforcing portion 15 in a direction approaching each other at right angles to the central axis of the rod-shaped reinforcing portion 15. Further, as the bottomed hole 3, the other surface 61 side of the reinforcing bar 27 disposed on the bottom 10 a side of the base hole 10 and the one surface of the reinforcing bar 27 disposed on the opening 23 side of the base hole 10. Those provided with locking recesses 13; 13 on both sides are used. Then, the engaging portion 22 on the other end side of the reinforcing member 4 is engaged with the outer peripheral surface on the other surface 61 side of the reinforcing bar 27 as the engaging surface on the bottom portion 10 a side of the bottomed hole 3, and one end of the reinforcing member 4 is engaged. The locking portion 22 on the side is locked to the outer peripheral surface on the one surface 2 side of the reinforcing bar 27 as the locking surface on the opening 23 side of the bottomed hole 3, and the filler 6 is filled into the bottomed hole 3. . In this way, the reinforcing bar 27 located on the one surface 2 side and the reinforcing bar 27 located on the other surface 61 side are sandwiched, and the reinforcing bar 27 located on the one surface 2 side and the other surface 61 side are located. Since the reinforcing member 4 is installed so as to restrain the concrete positioned between the reinforcing bars 27, the tensile force applied to the concrete structure 1 causes the reinforcing bars 27; 27 and the locking portions 22; Thus, the concrete structure 1 that is transmitted to the reinforcing member 4 and has improved resistance to shear stress is obtained. Further, since the reinforcing member 4 is installed so as to sandwich the reinforcing bar 27 positioned on the one surface 2 side and the reinforcing bar 27 positioned on the other surface 61 side, the reinforcing bar 27 positioned on the one surface 2 side and the other reinforcing bar 4 are disposed. The compressive force applied to the concrete positioned between the reinforcing bars 27 located on the surface 61 side can be dispersed by the reinforcing bars 27; 27, and the resistance to shear stress can be improved.

  That is, the bottomed hole 3 is provided on the base hole portion 10 that opens on the one surface 2, and on the opening 23 side and the bottom portion 10 a side of the base hole portion 10. Each of the locking recesses 13; 13 extending in a direction crossing the center line of the 10 holes, and the reinforcing member 4 is locked to the locking surface of each locking recess 13; 22, the locking portion 22 of the reinforcing member 4 inserted into the bottomed hole 3; 22 is locked to the outer peripheral surface of the reinforcing bar 27; 27 forming the locking surface 21; 21 of the locking recess 13; The filler 6 is filled between the inner wall surface 11 of the bottomed hole 3 and the reinforcing member 4 so as to fill a gap between the inner wall surface 11 of the bottomed hole 3 and the reinforcing member 4. It was set as the concrete structure 1 of the structure.

Embodiment 9
The locking recess 13 may be formed using a grinder device 50 as shown in FIG. As the grinder device 50, for example, one having a configuration in which a disc grindstone 52 as a cutting portion rotating around the rotation shaft 51 is fixed to the tip of the rotation shaft 51 rotated by a motor or the like (not shown) is used. In this case, for example, after the base hole portion 10 is formed by the first water jet 40, the disc grindstone 52 of the grinder device 50 is rotated, and the outer peripheral surface of the disc grindstone 52 is formed on the base hole portion 10 as shown in FIG. By moving the rotating shaft 51 in a direction intersecting the rotation center line of the rotating shaft 51 while bringing it into contact with the inner wall surface 11 while being brought into contact with the inner wall surface 11, it is locked to the base hole portion 10 as shown in FIG. The recess 13 can be formed. Thus, even when the grinder device 50 is used, the locking surface 21 that is orthogonal to the center line 12 (see FIG. 1) of the base hole 10 can be easily formed. In addition, you may use the grinder apparatus of the structure (eccentric structure) which the rotation center line of the rotating shaft 51 and the center of the disk grindstone 52 shifted | deviated.

Embodiment 10
In the above description, the locking surface 21 is constituted by the outer peripheral surface of the reinforcing bar, but the locking surface 21 may be formed by a concrete surface formed inside the existing concrete structure 1A. Even if it does in this way, the tensile force added to the concrete structure 1 is transmitted to the reinforcement member 4 via the latching surface 21 and the latching | locking part 22, and the concrete structure 1 which the proof stress with respect to a shear stress improves is obtained.

The present invention can be applied to a concrete structure 1 such as an existing reinforced concrete structure, a non-ferrous concrete structure, a steel reinforced concrete structure, or the like.
As the filler 6, a solidifying material such as grout, mortar, cement milk, or resin concrete may be used.
The base hole 10 may be formed using a core drill device or other drilling device.

  Further, the locking surface 21 of the locking recess 13 may be a surface that can be locked by the locking portion 22 of the reinforcing member 4 and prevent the reinforcing member 4 from moving to the opening 23 side of the bottomed hole 3. That is, it may be a locking surface of a locking recess formed so as to extend in a direction intersecting with the center line 12 of the hole of the base hole portion 10, and in short, the locking portion 22 of the reinforcing member 4 is engaged. It should just be formed in the surface which can stop and can prevent the movement to the opening 23 side of the bottomed hole 3 of the reinforcing member 4. Further, the locking recess 13 may be formed so as to extend in any direction such as upward, leftward, rightward, downward, etc. from the center line 12 of the base hole 10.

1 concrete structure, 1A existing concrete structure, 2 side,
3 bottomed hole, 4 reinforcing member, 5 fixing means, 6 filler, 10 base hole,
11 inner wall surface of base hole, 13 locking recess, 13a inner wall surface of locking recess,
21 Locking surface, 22 Locking portion, 23 Base hole opening, 24 Rebar,
25 one end of the reinforcing member, 26 male thread,
30 fixing plate, 31 nut, 32 central through hole (through hole),
41 second water jet (water jet), 43 water conduit,
50 grinder device, 51 rotating shaft, 52 disc grindstone (cutting part).

Claims (6)

An existing concrete structure in which a reinforcing member is installed in a bottomed hole drilled from one surface of an existing concrete structure and a filler is filled so as to fill a gap between the inner wall surface of the bottomed hole and the reinforcing member In the shear reinforcement method of
Formed as a bottomed hole with a base hole opening on one surface and a locking recess extending from the inner wall surface of the base hole in a direction intersecting the center line of the hole of the base hole,
As a reinforcing member, a member provided with a locking portion that locks to the locking surface of the locking recess is formed,
A shear reinforcement method for an existing concrete structure, wherein a locking portion of a reinforcing member is locked to a locking surface, and a filler is filled between the reinforcing member and the inner wall surface of the bottomed hole.   Using a reinforcing member with an external thread at one end and a locking part at the other end, and a fixing means with a fixing plate and nut, insert the reinforcing member into the bottomed hole from the other end Then, with the locking portion of the reinforcing member locked to the locking surface of the locking recess, one end of the reinforcing member protruding from the opening of the base hole is passed through the through hole of the fixing plate and screwed into the male screw portion. 2. The reinforcing member is fixed to one surface of the existing concrete structure by pressing the fixing plate with the attached nut and bringing the fixing plate into contact with one surface of the existing concrete structure. The shear reinforcement method of the existing concrete structure of description. An existing concrete structure in which a reinforcing member is installed in a bottomed hole drilled from one surface of an existing concrete structure and a filler is filled so as to fill a gap between the inner wall surface of the bottomed hole and the reinforcing member In the shear reinforcement method of
As a bottomed hole, it is provided on the base hole part that opens on one surface, the opening side and the bottom part side of the base hole part, and extends from the inner wall surface of the base hole part in the direction intersecting the center line of the hole of the base hole Formed with each locking recess,
As a reinforcing member, a member provided with a locking portion that is locked to the locking surface of each locking recess is formed,
An existing concrete structure in which each locking portion of the reinforcing member is locked to the locking surface of the corresponding locking recess, and the filler is filled between the reinforcing member and the inner wall surface of the bottomed hole. Body shear reinforcement method.   After the base hole is formed, the water guide pipe inserted into the base hole and extending along the center line of the base hole is provided at one end of the water guide pipe, and the pressure is increased in the direction perpendicular to the center line of the water guide pipe. The shear reinforcement of the existing concrete structure according to any one of claims 1 to 3, wherein the locking recess is formed using a water jet having a high-pressure water injection hole for injecting water. Method.   After forming the base hole, use a grinder device equipped with a cutting part that rotates around the rotation axis at the tip of the rotation axis, and rotate the rotation axis while contacting the rotating cutting part to the inner wall surface of the base hole. The method for shear reinforcement of an existing concrete structure according to any one of claims 1 to 3, wherein a locking recess is formed by moving the shaft in a direction intersecting with the rotation center line of the shaft.   The existing concrete structure is formed of a reinforced concrete structure, and the locking surface is formed of a reinforcing bar exposed on the inner wall surface of the locking recess. Shear reinforcement method for existing concrete structures.

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