JP2017186859A - Structure and method for reinforcing construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure and a method for reinforcing a construction which can give appropriate shear strength to the construction.SOLUTION: A structure for reinforcing a construction includes a solidification material 11 filled in an insertion hole 50 formed in a construction 32, and a hole-in anchor 10 embedded in the solidification material 11. The hole-in anchor 10 includes a rod-like anchor body 1, and at least a pair of fixing parts 2 provided on the anchor body 1 at an interval in a length direction of the anchor body. At least one of the pair of the fixing parts 2 has an expansion portion gradually increasing its cross section from one end to the other end in a direction separating from the other fixing portion 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a reinforcing structure and a reinforcing method for a structure.

  Post-construction anchors are used to reinforce concrete structures. For example, in order to increase the shear strength of the wall body of a reinforced concrete structure, a reinforcing structure in which an insertion hole is formed in the wall body and a post-construction anchor is provided in the insertion hole has been proposed (for example, Patent Documents 1 to 3). 3).

In the shear reinforcement structure described in Patent Document 1, a shear reinforcement member having a wire and a proximal fixing member fixed to the proximal end portion is used. In this shear reinforcement structure, the shear reinforcement member is inserted into the insertion hole formed in the reinforced concrete structure together with the filler.
In the shear reinforcement structure described in Patent Document 2, a reinforcing member having a thread portion and a nut provided on the thread portion is used. In this shear reinforcing structure, the reinforcing member is embedded in the reinforced concrete member.
In the reinforcing structure described in Patent Document 3, a shear reinforcing member having a screw node reinforcing bar and fixing bodies provided at both ends of the screw node reinforcing bar is used. In this reinforcing structure, the shear reinforcing member is inserted into the insertion hole of the concrete structure together with the grout material.

Japanese Patent No. 3668490 Japanese Patent No. 5609296 Japanese Patent No. 5586641

  The magnitude of the shear force acting on the structure varies depending on the external force received by the structure, the site of the structure, and the like. A high shear strength is required when the shear force acting on the structure is large, but if the shear strength is excessively increased when the shear force is small, a cost problem arises. It is necessary to give an appropriate shear strength according to the condition.

  An object of this invention is to provide the reinforcement structure of a structure and the reinforcement method which can give appropriate shear strength to a structure.

One aspect of the present invention includes a solidified material filled in an insertion hole formed in a structure, and a post-installed anchor embedded in the solidified material, and the post-installed anchor includes a rod-shaped anchor body, The anchor main body includes at least a pair of fixing portions provided at intervals in the length direction of the anchor main body, and at least one of the pair of fixing portions is fixed to the other from one end to the other end. Provided is a reinforcing structure for a structure having an enlarged portion whose cross-sectional area gradually increases in a direction away from the portion.
According to this configuration, since the fixing portion has an enlarged portion in which the cross-sectional area gradually increases, when a force in the pulling direction is applied to the post-installed anchor, a high support pressure is generated in the fixed portion, and the post-installed anchor The fixing power of can be increased. In addition, by selecting a post-construction anchor having a fixing portion having an appropriate shape according to the shearing force acting on the structure, an appropriate shear strength can be given to the structure.
Therefore, destruction of the structure can be reliably prevented and construction costs can be suppressed.

The fixing portion is attached to the anchor main body, the pair of fixing portions each have the enlarged portion, and a maximum outer dimension of the fixing portion is a portion of the anchor main body between the pair of fixing portions. It is preferably larger than the outer dimensions.
According to this configuration, since the pair of fixing portions has the enlarged portion whose cross-sectional area gradually increases in a direction away from each other, when a force in the pulling direction is applied to the post-installed anchor, resistance to the force in the pulling direction is applied. The force is increased, and the anchoring power of the post-construction anchor can be increased.

It is preferable that the fixing portion has a truncated cone shape in which a sectional area gradually increases from the one end toward the other end.
According to this configuration, when a force in the pulling direction is applied to the post-construction anchor, a supporting pressure can be generated over the entire circumference of the fixing body, and the fixing force of the post-construction anchor can be increased.

It is preferable that the fixing portion is detachably attached to the anchor body.
According to this configuration, it is possible to use a fixing portion having an appropriate shape depending on the location where the post-construction anchor is installed. Therefore, the fixing force of the post-construction anchor can be easily adjusted, and the reinforcement effect of the post-construction anchor can be optimized. Therefore, an appropriate shear strength can be given to the structure, the structure can be reliably prevented from being destroyed, and the construction cost can be suppressed.

The anchor body has a main part between the pair of fixing parts and an attachment part to which the fixing part is attached, and the attachment part is formed with a male screw. It is preferable that a screw hole having a female screw screwed with a male screw is formed, and the fixing portion is attached to the anchor body by screwing the screw hole into the male screw.
According to this configuration, the fixing portion can be easily attached to and detached from the anchor body. Therefore, the fixing part can be easily replaced.

The maximum outer dimension of the fixing body is preferably smaller than the inner dimension of the insertion hole.
According to this configuration, since the operation for inserting the post-construction anchor into the insertion hole becomes easy, the post-construction anchor can be easily constructed.

It is preferable that a surface of the anchor main body at a portion between the pair of fixing portions is formed to be smooth.
According to this structure, when the pull-out force in the length direction acts on the post-construction anchor, the pull-out force tends to act directly on the fixing portion. Since a load can be borne on the adhering portion having excellent resistance to the pulling force, a high reinforcing effect can be obtained.
In addition, when the surface of the portion between the fixed portions is formed smoothly, when a shearing force is applied to the structure, a sufficient elastic range is ensured for the structure in the length range corresponding to the portion. Can do. Thereby, a structure becomes difficult to fracture | rupture and shear strength is raised.

The insertion hole is preferably a through-hole penetrating the structure.
According to this configuration, a sufficient length (depth) is secured in the insertion hole, and the shear strength can be increased in a wide range in the thickness direction of the structure.

One aspect of the present invention includes a drilling step of forming an insertion hole in a structure, a filling step of filling the insertion hole with a solidifying material, a rod-shaped anchor body, and the anchor body in the length direction of the anchor body. And at least one of the pair of fixing portions, and at least one of the pair of fixing portions is enlarged so that a cross-sectional area gradually increases in a direction away from the other fixing portion from one end to the other end. And a step of inserting a post-construction anchor having a portion into the insertion hole.
According to this method, since the fixed portion has an enlarged portion whose cross-sectional area gradually increases, when a force in the drawing direction is applied to the post-installed anchor, a high supporting pressure is generated in the fixed portion, and the post-installed anchor The fixing power of can be increased. In addition, by selecting a post-construction anchor having a fixing portion having an appropriate shape according to the shearing force acting on the structure, an appropriate shear strength can be given to the structure.
Therefore, destruction of the structure can be reliably prevented and construction costs can be suppressed.

In one aspect of the present invention, after the post-construction anchor is inserted into the insertion hole by the insertion step, the post-construction anchor is embedded in the solidified material by filling the insertion hole with the solidification material by the filling step. Can take the way.
According to this method, when there is no solidified material in the insertion hole, the installation hole is installed in the insertion hole of the construction anchor, so that the position in the insertion hole of the post-construction anchor can be accurately determined.

One aspect of the present invention can employ a method of embedding the post-construction anchor in the solidified material by the insertion step after the solidification material is filled in the insertion hole by the filling step.
According to this method, since the solidification material is filled in the insertion hole without the post-construction anchor, the solidification material can be filled in the entire internal space of the insertion hole. Therefore, it becomes difficult to generate a gap in the insertion hole. Therefore, it is possible to prevent the fixing force from being reduced due to the gap in the insertion hole.

According to one aspect of the present invention, since the fixed portion has an enlarged portion in which the cross-sectional area gradually increases, when a force in the pulling direction is applied to the post-installed anchor, a high supporting pressure is generated in the fixed portion, The anchorage of post-installed anchors can be increased. In addition, by selecting a post-construction anchor having a fixing portion having an appropriate shape according to the shearing force acting on the structure, an appropriate shear strength can be given to the structure.
Therefore, destruction of the structure can be reliably prevented and construction costs can be suppressed.

It is sectional drawing which shows the reinforced concrete structure which has a reinforcement structure of 1st Embodiment of this invention. It is sectional drawing which shows a part of reinforced concrete structure of a previous figure. It is a side view which shows the 1st example of a post-construction anchor. It is a side view which shows a part of post-construction anchor shown in FIG. It is a side view which shows the structure of the post-construction anchor shown in FIG. 3, (a) shows a part of anchor main body, (b) shows a fixing body. It is explanatory drawing of the reinforcement structure of 1st Embodiment. (A)-(c) is a side view which shows the example of the fixing body which can be used for the post-construction anchor shown in FIG. It is explanatory drawing explaining the 1st example of the reinforcement method of 1st Embodiment. It is explanatory drawing explaining the 2nd example of the reinforcement method of 1st Embodiment. It is a side view which shows a part of construction anchor after a buffer member is provided. It is a side view which shows a part of 2nd example of a post-construction anchor. It is a side view which shows a part of 3rd example of a post-construction anchor. It is a side view which shows a part of 4th example of a post-construction anchor. It is explanatory drawing explaining an example of the reinforcement method using the construction anchor after the previous figure. It is sectional drawing which shows the reinforced concrete structure which has a reinforcement structure of 2nd Embodiment of this invention. It is sectional drawing which shows a part of reinforced concrete structure of a previous figure. (A) It is the schematic which shows the other example of the structure to which the reinforcement structure of embodiment is applied. (B) It is an expanded sectional view which shows the structure shown to (a). It is the schematic which shows the other example of the structure to which the reinforcement structure of embodiment is applied. (A) is a sectional side view of a structure, (b) is a front view of a structure. It is the schematic which shows the other example of the structure to which the reinforcement structure of embodiment is applied. It is a side view which shows the 5th example of a post-construction anchor. It is a side view which shows the 6th example of a post-construction anchor. It is a side view which shows the 7th example of a post-construction anchor. It is a side view which shows the 8th example of a post-construction anchor. It is a figure which shows typically the 9th example of a post-construction anchor. (A)-(c) shows the assembly procedure of a post-construction anchor. It is a side view which shows a part of 10th example of a post-construction anchor. It is a perspective view which shows a part of 11th example of a post-construction anchor. It is a perspective view which shows a part of 12th example of a post-construction anchor. It is explanatory drawing which shows the 13th example of a post-construction anchor. (A)-(c) shows the assembly procedure of a post-construction anchor. It is a disassembled perspective view which shows a construction anchor after the previous figure, (a) is a main-body part, (b) is a fitting part. (A) It is a side view which shows a part of 14th example of a post-construction anchor. (B) It is a front view which shows a construction anchor after (a). It is a disassembled perspective view which shows the 15th example of a post-construction anchor. (A) It is a disassembled perspective view which shows the 16th example of a post-construction anchor. (B) It is a side view which shows a part of construction anchor after (a). It is a side view which shows the 17th example of a post-construction anchor. It is a side view which shows the 18th example of a post-construction anchor. It is a side view which shows the 19th example of a post-construction anchor. It is a side view which shows the 20th example of a post-construction anchor. It is a side view which shows the 21st example of a post-construction anchor. It is a side view which shows the 22nd example of a post-construction anchor. It is a side view which shows the 23rd example of a post-construction anchor. It is a side view which shows a part of 24th example of a post-construction anchor. (A) It is a perspective view which shows a part of 25th example of a post-construction anchor. (B) It is a figure which shows the metal mold | die for manufacturing a construction anchor after (a).

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a reinforcing structure for a structure according to the present invention will be described in detail with reference to the drawings. The technical scope of the present invention is not limited to the following embodiments. Note that the reinforcing structure of the structure is sometimes simply referred to as a reinforcing structure.
<Reinforcing structure of structure> (first embodiment)
FIG. 1 is a cross-sectional view showing a reinforced concrete structure 32 having a reinforcing structure according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a part of the reinforced concrete structure 32. FIG. 3 is a side view showing a post-construction anchor 10 that is a first example of a post-construction anchor. FIG. 4 is a side view showing a part of the post-construction anchor 10. FIG. 5 is a side view showing the structure of the post-installed anchor 10, FIG. 5 (a) shows a part of the anchor body 1, and FIG. 5 (b) shows the fixing body 2.

<Structure>
As shown in FIG. 1, the reinforced concrete structure 32 to which the reinforcing structure of the present embodiment is applied is an example of an existing structure, and is a cylindrical structure built underground, such as a box culvert. The culvert structure. The reinforced concrete structure 32 can be used for underground tunnels, underground passages, underdrains and the like for railways and roadways. Reference numeral 31 denotes the ground surface.

  The reinforced concrete structure 32 includes a lower wall 33, a wall body 34 that is a side wall provided on the side edge of the lower wall 33, and an upper wall 35 provided on the upper edge of the wall body 34. A shows the inner air side (inside) of the reinforced concrete structure 32, and B shows the outside of the reinforced concrete structure 32, that is, the earth and sand side. Reference numeral 34 a denotes an inner surface (inner wall surface) of the wall body 34, and reference numeral 34 b denotes an outer surface (outer wall surface) of the wall body 34.

  A plurality of main reinforcing bars 36 and a plurality of distribution reinforcing bars 37 are provided inside the lower wall 33, the wall body 34, and the upper wall 35. The main reinforcing bar 36 of the wall 34 is provided along the vertical direction in parallel with the inner wall surface 34a. In FIG. 1, the plurality of main reinforcing bars 36 are provided at intervals in the thickness direction of the wall body 34. The distribution reinforcing bar 37 of the wall body 34 is provided in a direction parallel to the inner wall surface 34 a and orthogonal to the main reinforcing bar 36.

<Outline of reinforcement structure>
As shown in FIGS. 1 and 2, the mechanical strength of the reinforced concrete structure 32 is increased by forming the reinforcing structure 20. The reinforcing structure 20 has a structure in which the post-construction anchor 10 is provided in the insertion hole 50 formed in the wall body 34 of the reinforced concrete structure 32.

<Insertion hole>
The insertion hole 50 is formed from the inner wall surface 34a (one surface) of the wall body 34 toward the outer wall surface 34b (the other surface), and the cross-sectional shape thereof is, for example, a circle. The formation direction of the insertion hole 50 is, for example, a direction perpendicular to the inner wall surface 34a.
The inner dimension of the insertion hole 50 (the dimension in a direction orthogonal to the direction in which the insertion hole 50 is formed. For example, the inner diameter) (for example, the minimum dimension) is the maximum outer dimension of the fixing body 2 (the extending direction of the anchor body 1 Larger than the dimension in the orthogonal direction (for example, outer diameter). The inner dimension of the insertion hole 50 is preferably constant in the depth direction. The insertion hole 50 is preferably formed so as to avoid the main reinforcing bar 36 and the distribution reinforcing bar 37.
The direction in which the insertion hole 50 is formed can be adjusted as appropriate depending on the direction and magnitude of the shearing force applied to the reinforced concrete structure 32. For example, the formation direction of the insertion hole 50 may be a direction in which the insertion hole 50 is inclined at an angle of more than 0 ° and less than 90 ° with respect to the inner wall surface 34a.
1 and 2, the insertion hole 50 is a through hole that penetrates the wall body 34 in the thickness direction from the inner wall surface 34a to the outer wall surface 34b. Since the insertion hole 50 is a through hole, a sufficient length (depth) is secured, and the shear strength can be increased in a wide range in the thickness direction of the wall body 34.

<Post-construction anchor> (first example)
As shown in FIGS. 3 and 4, the post-installed anchor 10 includes a rod-shaped anchor main body 1 and a fixing body 2 attached to one end and the other end of the anchor main body 1.
As shown in FIG. 5A, the anchor body 1 is made of, for example, a PC steel bar (round steel bar), and includes a main part 1b (a part located between two fixing bodies 2) and both ends of the main part 1b. And a male screw 1a (attachment portion) formed on the portion.
The main portion 1b of the anchor main body 1 has a circular cross section, and its outer diameter is constant in the length direction. The surface of the main portion 1b has a smooth shape with no irregularities. Since the main portion 1b has no irregularities on the surface, the shape of the cross section perpendicular to the length direction of the main portion 1b is constant in the length direction of the main portion 1b. Smoothness refers to the radial direction between a portion where the radial dimension from the central axis C1 of the anchor body 1 is minimum (minimum diameter portion) and a portion where the radial dimension from the central axis C1 is maximum (maximum diameter portion). The dimensional difference (height difference) is, for example, 1 mm or less.
If the main portion 1b of the anchor main body 1 is formed smoothly, when a pulling force in the length direction acts on the post-construction anchor 10, the pulling force tends to act directly on the fixing body 2. Since the load can be applied to the fixing body 2 having excellent resistance to the pulling force, a high reinforcing effect can be obtained. Further, when the main portion 1b of the anchor body 1 is formed smoothly, when a shearing force is applied to the wall body 34, a sufficient elastic region is secured in the wall body 34 in a length range corresponding to the main portion 1b. can do. Thereby, the wall body 34 becomes difficult to break and the shear strength is increased.

  In the male screw 1a, for example, the outer diameter of the trough is almost equal to the outer diameter of the anchor main body 1, and the outer diameter of the peak is preferably larger than the outer diameter of the main portion 1b of the anchor main body 1. The male screw 1a is formed by forging screw processing, for example.

As shown in FIGS. 3, 4, and 5 (b), the fixing body 2 is a member made of steel, for example, and gradually increases in cross-sectional area from one end 21 (small diameter end) to the other end 22 (large diameter end). Has an enlarged portion 2c. The two fixing bodies 2 are attached to the anchor main body 1 so that the cross-sectional area of the enlarged portion 2c gradually increases from one end 21 toward the other end 22 in a direction away from each other.
In the present embodiment, the fixing body 2 (enlarged portion 2 c) has a truncated cone shape whose outer diameter increases from one end 21 in the central axis direction of the fixing body 2 toward the other end 22. Therefore, as shown in FIG. 4, the outer peripheral surface of the fixing body 2 is inclined at a constant angle with respect to the central axis C <b> 2 of the fixing body 2. The inclination angle θ1 of the outer peripheral surface of the fixing body 2 with respect to the central axis C2 of the fixing body 2 is, for example, 1 to 45 °. The center axis C2 of the fixing body 2 is preferably coincident with the center axis C1 of the anchor body 1.

  Since the fixing body 2 has a truncated cone shape, when a force in the pulling direction is applied to the post-construction anchor 10, a support pressure P1 (see FIG. 6) is generated over the entire circumference of the fixing body 2, and the post-construction anchor The fixing power of 10 can be increased.

The enlarged portion 2 c is formed over the entire length of the fixing body 2 in the central axis direction. Therefore, the entire length of the fixing body 2 can be suppressed while giving a sufficient length to the enlarged portion 2c on which the pulling force acts. Since the entire length of the fixing body 2 is suppressed, the length of the main portion 1b can be ensured accordingly. Further, as described above, the main portion 1b of the anchor main body 1 has a shape without irregularities.
Since the main portion 1b has no unevenness and has a sufficient length, when a shearing force is applied to the wall body 34, a sufficient elastic region is secured in the wall body 34 in a length range corresponding to the main portion 1b. be able to. Thereby, the wall body 34 becomes difficult to break and the shear strength is increased. Further, since the enlarged portion 2c is formed over the entire length of the fixing body 2, the surface area of the enlarged portion 2c can be increased. Therefore, when a force in the pulling direction is applied, a large support pressure P1 (see FIG. 6) can be obtained, and the fixing force of the post-construction anchor 10 can be increased.

As shown in FIG. 5B, the fixing body 2 is formed with a screw hole 2 a having a female screw that is screwed with the male screw 1 a of the anchor body 1. The screw hole 2 a is formed so as to penetrate from the one end 21 to the other end 22 of the fixing body 2.
The fixing body 2 is attached to the anchor main body 1 in a posture in which one end 21 is directed to the center in the length direction of the anchor main body 1 by being screwed onto the male screw 1a of the anchor main body 1. The two fixing bodies 2 are attached to the anchor main body 1 in such a posture that the one ends 21 face each other. The fixing body 2 is structured to be screwed to the anchor main body 1 and can be easily attached to and detached from the anchor main body 1. Therefore, the fixing body 2 can be easily replaced.

  Since the fixing body 2 is structured to be screwed onto the male screw 1a of the anchor main body 1, the position of the fixing body 2 in the length direction of the anchor main body 1 can be adjusted. Therefore, the fixing force of the post-construction anchor 10 can be easily adjusted, and the reinforcement effect of the post-construction anchor 10 can be optimized.

As shown in FIG. 4, at least the outer diameter (maximum outer dimension) of the other end 22 of the fixing body 2 is larger than the outer diameter (outer dimension) of the main portion 1 b of the anchor body 1. The outer diameter (outer dimension) of the fixing body 2 is maximum at the other end 22. In the fixing body 2, the outer diameter of the one end 21 is preferably larger than the outer diameter of the main portion 1 b of the anchor body 1. The outer dimension of the fixing body 2 is an outer dimension in a direction orthogonal to the central axis C2.
Since the post-construction anchor 10 has the male thread 1a of the anchor body 1 formed relatively thick, the strength of the anchor body 1 is unlikely to decrease.
The two fixing bodies 2 and 2 are in positions separated from each other via the main portion 1b. Since the outer dimension (outer diameter) of the fixing body 2 is larger than that of the main portion 1 b of the anchor main body 1, the fixing body 2 functions as a fixing portion having a convex portion protruding from the outer surface of the anchor main body 1.

  The outer diameter (maximum outer diameter) of the other end 22 of the fixing body 2 is preferably smaller than the inner diameter of the insertion hole 50 (an inner dimension in a direction orthogonal to the direction in which the insertion hole 50 is formed). Thereby, since the operation which inserts the post-construction anchor 10 in the insertion hole 50 becomes easy, the post-construction anchor 10 can be constructed easily. The post-construction anchor 10 is preferably arranged in the insertion hole 50 so that the length direction coincides with the depth direction of the insertion hole 50.

  As shown in FIG. 6, when a pulling force in the length direction of the post-construction anchor 10 acts on the post-construction anchor 10 installed on the reinforced concrete structure 32, the support body P1 acts on the solidified material 11 by the fixing body 2. To do. In the post-installed anchor 10, the main portion 1 b of the anchor main body 1 has no irregularities on the surface, so that the pulling force is likely to act directly on the fixing body 2.

  The support pressure P1 acts on the solidified material 11 from the tapered outer peripheral surface of the fixing body 2. The direction of the support pressure P1 is a direction (obliquely forward) that inclines away from the central axis of the fixing body 2 in the drawing direction. The wedge effect of the support pressure P1 increases the frictional force between the solidified material 11 and the inner surface of the insertion hole 50, increases the resistance to the force in the pulling direction, and improves the fixing force of the post-installed anchor 10.

FIG. 7A to FIG. 7C are diagrams showing other examples of the fixing body.
The fixing bodies 2A, 2B, and 2C shown in FIGS. 7A to 7C have a truncated cone shape in which the outer diameters of the other ends 22A to 22C are different from those of the fixing body 2 shown in FIG. Yes. Specifically, in the fixing body 2A shown in FIG. 7A, the outer diameter of the other end 22A is larger than the outer diameter of the other end 22 of the fixing body 2 shown in FIG. Therefore, the fixing body 2A has a larger inclination angle of the outer peripheral surface than the fixing body 2 shown in FIG. The inclination angle of the outer peripheral surface is an inclination angle with respect to the central axis of the fixing bodies 2 and 2A.
7B, the outer diameter of the other end 22B is larger than the outer diameter of the other end 22A of the fixing body 2A shown in FIG. 7A, and the outer peripheral surface is inclined as compared with the fixing body 2A. The angle is large.
The fixing body 2C shown in FIG. 7C has an outer diameter of the other end 22C larger than the outer diameter of the other end 22B of the fixing body 2B shown in FIG. The angle is large.
The outer diameter of the one end 21 of the fixing bodies 2A to 2C can be the same as the outer diameter of the one end 21 of the fixing body 2.

The fixing bodies 2A, 2B, 2C are attached to the male screw 1a of the anchor body 1 in a replaceable manner.
In the post-construction anchor 10, the fixing force can be easily adjusted by appropriately selecting and using the truncated cone-shaped fixing members 2, 2A, 2B, and 2C having different inclination angles of the outer peripheral surface. For example, the fixing body 2A shown in FIG. 7A has a larger inclination angle of the outer peripheral surface than the fixing body 2 shown in FIG. 5B, so that when the pulling force is applied, Increasing slope. That is, if the fixing body 2A is used, a support pressure P1 in a direction inclined at a larger angle with respect to the radial direction of the post-installed anchor 10 is generated.
Therefore, in place of the fixing body 2 shown in FIG. 5B, if the fixing body 2A having a large outer diameter at the other end 22A shown in FIG. 7A is used, the resistance to the pulling force can be increased. As shown in FIGS. 7B and 7C, if the fixing members 2B and 2C having the larger outer diameters of the other ends 22B and 22C are used, the resistance can be further increased.

On the other hand, the post-construction anchor having the fixing body having a small outer diameter at the other end has a small resistance to the pulling force, but can be disposed on the other side even when the inner diameter of the insertion hole 50 is small. Therefore, it is advantageous when it is difficult to form an insertion hole with a large inner diameter for reasons such as ensuring the strength of the structure and maintaining the appearance. Further, the post-construction anchor having a fixing body having a small outer diameter at the other end also has an advantage that it is easy to handle.
In this way, a plurality of fixing bodies 2A, 2B, 2C having different outer diameters at the other end are prepared in advance, and a fixing body having an appropriate shape is selected according to the situation of the place where the post-installation anchor 10 is installed. Can be used.

<Reinforcing method of structure> (first embodiment)
A first example of the reinforcing method of the first embodiment will be described.

(Step 1: Drilling step)
As shown in FIG. 8A, an insertion hole 50 is formed from the inner wall surface 34a at a predetermined location of the wall body 34 of the reinforced concrete structure 32 using a drilling tool (not shown). For example, a rotary tool such as a hammer drill, a core drill, or a rock drill can be used as the drilling tool. The insertion hole 50 is formed at a position where the post-construction anchor 10 can be placed at a place where reinforcement is required.
By performing the reinforcement work of the reinforced concrete structure 32 from the inner wall surface 34a, the construction cost can be reduced compared to the case of performing the reinforcement work from the outer wall surface 34b side.

(Process 2: Insertion process)
As shown in FIG. 8B, the post-construction anchor 10 is inserted into the insertion hole 50 from the inner wall surface 34a side along the depth direction. The post-construction anchor 10 is arranged so that the whole is accommodated in the insertion hole 50.

(Process 3: Filling process)
As shown in FIG. 8C, the solidification material 11 is filled into the insertion hole 50 using an injection device (not shown). The solidified material 11 is preferably filled in the entire internal space of the insertion hole 50. As the solidifying material 11, for example, a grouting material such as mortar and concrete can be used. In particular, since the solidified material 11 having plasticity (thixotropic properties) is difficult to leak from the insertion hole 50, the solidified material 11 can be suitably solidified in the insertion hole 50.
By filling the solidified material 11 into the insertion hole 50, the entire post-construction anchor 10 is embedded in the solidified material 11.

  By solidifying the solidified material 11, the post-construction anchor 10 can be installed on the reinforced concrete structure 32, and the reinforced concrete structure 32 can be reinforced by the post-construction anchor 10.

  Next, a second example of the reinforcing method of the first embodiment will be described. In the first example, after the post-construction anchor 10 is inserted into the insertion hole 50, the solidification material 11 is filled into the insertion hole 50. In the second example, after the solidification material 11 is filled into the insertion hole 50, the insertion hole After 50, the construction anchor 10 is inserted.

(Step 1: Drilling step)
As shown in FIG. 9A, the insertion hole 50 is formed in the wall body 34.

(Process 2: Filling process)
As shown in FIG. 9B, the solidification material 11 is filled into the insertion hole 50 using an injection device (not shown). The solidified material 11 is preferably filled in the entire internal space of the insertion hole 50.

(Process 3: Insertion process)
As shown in FIG. 9C, the post-construction anchor 10 is inserted into the solidified material 11 along the depth direction of the insertion hole 50 before the solidified material 11 is solidified. The post-construction anchor 10 is arranged so as to be embedded in the solidified material 11 in the insertion hole 50 as a whole.
Since the fixing body 2 has a taper shape, bubbles are less likely to adhere to the outer peripheral surface due to air being involved in the process of embedding in the solidifying material 11. Therefore, it is possible to prevent the fixing force from being reduced due to residual bubbles.

  By solidifying the solidified material 11, the post-construction anchor 10 can be installed on the reinforced concrete structure 32, and the reinforced concrete structure 32 can be reinforced by the post-construction anchor 10.

The position of the post-construction anchor 10 in the insertion hole 50 can be adjusted according to the magnitude of the shear force and the operating position in the reinforced concrete structure 32. For example, the post-construction anchor 10 can be disposed at a location where a large shear force acts. The position where the shearing force acts on the reinforced concrete structure 32 can be predicted by structural analysis (for example, FEM). Therefore, the post-construction anchor 10 can be disposed at an appropriate position of the reinforced concrete structure 32.
Therefore, an appropriate shear strength can be given according to the shearing force acting on the reinforced concrete structure 32, and the destruction of the reinforced concrete structure 32 can be surely prevented. Moreover, it can avoid that reinforcement becomes excessive and can suppress construction cost.

According to the reinforcing structure, since the fixing body 2 has the enlarged portion 2c in which the sectional area gradually increases, a high supporting pressure is generated in the fixing body 2 when a force in the pulling direction is applied to the post-installed anchor 10. The fixing force of the post-construction anchor 10 can be increased. Further, by selecting the post-construction anchor 10 having the fixing body 2 having an appropriate shape according to the shearing force acting on the reinforced concrete structure 32, an appropriate shear strength can be given to the reinforced concrete structure 32.
Therefore, destruction of the reinforced concrete structure 32 can be reliably prevented and the construction cost can be suppressed.

  Since the pair of fixing bodies 2 have the enlarged portion 2c whose sectional area gradually increases in the direction away from each other, when a force in the pulling direction is applied to the post-installed anchor 10, resistance to the pulling direction force is large. Thus, the fixing force of the post-construction anchor 10 can be increased.

Since the post-construction anchor 10 is detachable from the anchor body 1, the post-construction anchor 10 can use the fixing body 2 having an appropriate shape according to the location where the post-construction anchor 10 is installed. Therefore, the fixing force of the post-construction anchor 10 can be easily adjusted, and the reinforcement effect of the post-construction anchor 10 can be optimized. Therefore, it is possible to give an appropriate shear strength to the reinforced concrete structure 32 to reliably prevent the reinforced concrete structure 32 from being broken and to reduce the construction cost.
Since the fixing body 2 is structured to be screwed onto the male screw 1a of the anchor body 1, it can be easily attached to and detached from the anchor body 1. Therefore, the fixing body 2 can be easily replaced.

According to the reinforcing method, since the fixing body 2 has the enlarged portion 2c in which the sectional area gradually increases, a high supporting pressure is generated in the fixing body 2 when a force in the pulling direction is applied to the post-installed anchor 10. The fixing force of the post-construction anchor 10 can be increased. Further, by selecting the post-construction anchor 10 having the fixing body 2 having an appropriate shape according to the shearing force acting on the reinforced concrete structure 32, an appropriate shear strength can be given to the reinforced concrete structure 32.
Therefore, destruction of the reinforced concrete structure 32 can be reliably prevented and the construction cost can be suppressed.

  As shown in FIG. 8, when the method of filling the insertion hole 50 with the solidified material 11 after inserting the post-construction anchor 10 into the insertion hole 50, the solidification material 11 is not in the insertion hole 50. Since it is installed in the insertion hole 50 of the construction anchor 10, the position in the insertion hole 50 of the post-construction anchor 10 can be accurately determined.

  As shown in FIG. 9, when the post-installation anchor 10 is inserted into the insertion hole 50 after the solidifying material 11 is filled in the insertion hole 50, the post-installation anchor 10 is not provided in the insertion hole 50. Since the solidified material 11 is filled, the solidified material 11 can be filled in the entire internal space of the insertion hole 50. Therefore, it is difficult for a gap to be generated in the insertion hole 50. Therefore, it is possible to prevent the fixing force from being reduced due to the gap in the insertion hole 50.

As shown in FIG. 6, when a pulling force is applied to the post-installed anchor 10, a stepped portion (shoulder portion 21 a) formed by a difference in outer diameter between the one end 21 of the fixing body 2 and the main portion 1 b of the anchor main body 1. It is easy to load.
Therefore, as shown in FIG. 10, the buffer body 3 can be provided on the anchor main body 1 so as to contact the one end 21 of the fixing body 2.
As the buffer member 3, for example, an O-ring made of a soft material such as butyl rubber can be used. The buffer member 3 preferably has a larger outer diameter than the one end 21 of the fixing body 2.

Since one end 21 of the fixing body 2 is thinner than other parts, the strength is relatively low. However, when the buffer member 3 is provided, even if a pulling force is applied to the post-installed anchor 10, the shoulder 21 a of the fixing body 2 is applied. A large load is not applied and damage to the shoulder 21a can be prevented. Further, the buffer member 3 can prevent foreign matter in the solidified material 11 from entering the gap between the anchor main body 1 and the fixing body 2.
When a pulling force is applied to the construction anchor 10 after the buffer member 3 is not provided, the mechanical strength of the reinforcing structure 20 may be slightly reduced by slightly damaging the solidified material 11 by the one end 21 of the fixing body 2. However, if the buffer member 3 is provided, the solidified material 11 will not be damaged, and the mechanical strength of the reinforcing structure 20 can be prevented from being lowered.

  The buffer member 3 is not limited to the O-ring, and a tape made of a soft material such as butyl rubber may be used. The tape can be used as a buffer member by being wound around the outer peripheral surface of a portion including the boundary between the anchor main body 1 and the fixing body 2.

<Post-construction anchor> (second example)
FIG. 11 is a schematic view showing a part of a post-construction anchor 10 </ b> A that is a second example of the post-construction anchor 10. Hereinafter, the same reference numerals are given to the already described configurations, and the description thereof is omitted.
The post-construction anchor 10A is different from the post-construction anchor 10 shown in FIG. 3 in that a fixing body 2D in which an annular step 2b is formed on the outer peripheral surface of the enlarged portion 2d is used.
The step portion 2 b is a portion where the outer diameter increases discontinuously from the one end 21 toward the other end 22. In the post-construction anchor 10A, stepped portions 2b are formed at intervals in the central axis direction of the fixing body 2 (the length direction of the post-construction anchor 10A). The step portion 2b can be formed in an annular shape over the entire circumference of the fixing body 2D. In addition, the number of the step parts 2b can be one or more.
In the post-construction anchor 10A, the support pressure against the pulling force is increased by the step portion 2b, so that the fixing force of the post-construction anchor 10A can be improved. Note that the buffer member 3 shown in FIG. 10 may be attached to the post-construction anchor 10A.

<Post-construction anchor> (third example)
FIG. 12 is a schematic view showing a part of a post-construction anchor 10B that is a third example of the post-construction anchor 10.
The post-construction anchor 10B is different from the post-construction anchor 10 shown in FIG. 3 in that a fixing body 2E in which the outer diameter of the one end 21 is substantially the same as the outer diameter of the main portion 1b of the anchor main body 1B is used.
In the post-construction anchor 10B, by making the outer diameter of the male screw 1a smaller than the outer diameter of the main portion 1b, a sufficient thickness can be secured at the one end 21 and damage to the fixing body 2E at the one end 21 can be prevented. . In the post-construction anchor 10B, the change in the outer diameter at the one end 21 is not discontinuous. Therefore, when a pulling force is applied, the load applied to the one end 21 is reduced. Therefore, it is possible to avoid a decrease in fixing force due to damage to the fixing body 2E.

<Post-construction anchor> (fourth example)
FIG. 13 is a schematic view showing a part of a post-construction anchor 10 </ b> C that is a fourth example of the post-construction anchor 10.
The post-construction anchor 10C shown in FIG. 3 is used in the post-construction anchor 10C in that a fixing body 2F having a projection 23 whose outer diameter decreases toward the outside in the length direction is provided at the other end 22. And different. In addition, outward in the length direction is a direction from the center in the length direction of the anchor body 1 toward the end.
The fixing body 2 </ b> F has an enlarged portion 2 c that gradually increases in cross-sectional area from one end 21 toward the other end 22, and a protrusion 23. The protrusion 23 preferably has a shape having an outer diameter that decreases toward the outside in the length direction of the post-construction anchor 10 </ b> C and has a vertex on the outermost side, for example, a substantially conical shape.

In order to construct the post-construction anchor 10C, the following method can be taken.
As shown in FIG. 14A, an insertion hole 50 is formed at a predetermined location of the wall body 34, and the inside thereof is filled with the solidifying material 11 (see FIG. 9B).
Next, as shown in FIG. 14B, before the solidified material 11 is solidified, the post-construction anchor 10C is inserted into the insertion hole 50 from the protrusion 23 side so as to be embedded in the solidified material 11 (FIG. 9C). )reference). Since the protrusion 23 has a smaller outer diameter as it is closer to the tip, the resistance when the post-construction anchor 10 is inserted into the solidified material 11 can be reduced. In addition, since the protrusion 23 has a shape with a smaller outer diameter as it is closer to the tip, bubbles are less likely to remain on the outer peripheral surface of the protrusion 23 in the process of being embedded in the solidified material 11. Therefore, it is possible to prevent the fixing force from being reduced due to residual bubbles.
Even when the post-construction anchor 10C is used, after inserting the post-construction anchor 10C into the insertion hole 50, a method of filling the solidified material 11 into the insertion hole 50 (see FIG. 8) may be employed.

The fixing members 2, 2D, 2E, and 2F shown in FIGS. 3 and 11 to 13 are attached to the male screw 1a of the anchor main body 1 in an exchangeable manner, so that the post-installed anchors 10, 10A, 10B, and 10C are installed. It can be selected according to the situation.
The presence or absence of the buffer member 3 shown in FIG. 10 can also be selected according to the location where the post-construction anchors 10, 10A, 10B, 10C are installed.

<Reinforcing structure of structure> (Second embodiment)
Next, the reinforcement structure of 2nd Embodiment of this invention is demonstrated.
FIG. 15 is a cross-sectional view showing a reinforced concrete structure 32 having a reinforcing structure according to a second embodiment of the present invention. FIG. 16 is a cross-sectional view showing a part of the reinforced concrete structure 32.
The reinforcing structure 20A shown in FIGS. 15 and 16 is a structure in which the post-construction anchor 10 shown in FIG. 3 is provided inside an insertion hole 50A that is a bottomed hole formed in the wall body 34. The reinforcing structure 20A may be the same as the reinforcing structure 20 shown in FIGS. 1 and 2 except that the insertion hole 50A is a bottomed hole that does not reach the outer wall surface 34b.

  The structure reinforcing method (second embodiment) when the insertion hole 50A that is a bottomed hole is employed is the same as the structure reinforcing method of the first embodiment except that the insertion hole 50A is formed in the drilling step. It is the same.

<Application example>
The reinforcing structure of the present embodiment can be applied not only to the reinforced concrete structure 32 (for example, box culvert) shown in FIG. 1 but also to other structures.
FIG. 17A is a schematic diagram showing a bridge 41 which is another example of a structure to which the reinforcing structure of the present invention can be applied. FIG. 17B is a cross-sectional view showing the reinforcing structure 20 provided on the bridge abutment 42.
The bridge 41 has a bridge abut 42 and a bridge girder 43. The bridge abutment 42 includes an abutment housing 44 and an abutment wall portion 45 provided thereon. A bank 46 is formed on the back surface of the abutment housing 44 and the abutment wall portion 45. A seat surface 44 a on which the end of the bridge girder 43 is installed is formed on the upper part of the abutment housing 44.
The reinforcing structure 20 is provided at a position including the inner wall surface 44 b of the abutment housing 44. The insertion hole 50 of the reinforcing structure 20 is a through hole formed from the inner wall surface 44b of the abutment housing 44 toward the outer wall surface 44c. The number of reinforcing structures 20 may be one or plural.

18 is a schematic view showing a viaduct 51 as another example of a structure to which the reinforcing structure of the present invention can be applied. FIG. 18A is a side sectional view of the viaduct 51, and FIG. FIG. 3 is a front view of the viaduct 51.
The viaduct 51 includes a pier (peer) 52 and a floor slab (girder) 53. The pier 52 is a columnar structure that supports the floor slab 53 and is made of, for example, reinforced concrete. On the upper surface of the floor slab 53, for example, a railroad track (not shown) is provided.
The pier 52 is provided with one or more reinforcing structures 20. The insertion hole 50 of the reinforcing structure 20 is a through hole formed from one wall surface 54a of the pier 52 toward the other wall surface 54b.

FIG. 19 is a schematic view showing a masonry 61 as another example of a structure to which the reinforcing structure of the present invention can be applied.
The assembled product 61 is configured by stacking a plurality of blocks 62. The block 62 is made of concrete, for example.
The block 62 is provided with one or a plurality of reinforcing structures 20A (see FIGS. 15 and 16). The insertion hole 50A of the reinforcing structure 20A is a bottomed hole formed from one wall surface 64a of the block 62 toward the other wall surface 64b.

<Post-construction anchor> (fifth example)
FIG. 20 is a schematic view showing a part of a post-construction anchor 10D that is a fifth example of the post-construction anchor 10.
The main portion 1Db of the anchor main body 1D of the post-construction anchor 10D has an intermediate portion 12 and end portions 13 and 13 on both ends of the intermediate portion 12. The end portion 13 is a portion including the end portion of the main portion 1Db. The surface of the end portion 13 has a smooth shape with no irregularities. The end side portion 13 is made of, for example, a PC steel bar (round steel bar) and can have a circular cross section.
The intermediate portion 12 is made of, for example, a deformed reinforcing bar, and on its surface, for example, a rib 12a that is a convex portion along the length direction of the anchor body 1D and a node 12b that is a convex portion along the circumferential direction of the anchor body 1D. It protrudes from the outer surface 12c. The maximum outer dimensions (dimensions in the direction perpendicular to the extending direction of the anchor main body 1D) of the convex portions (ribs 12a and nodes 12b) are preferably larger than the maximum outer dimensions (outer diameter) of the end side portion 13. The length of the intermediate part 12 can be 20 to 80% of the length of the main part 1Db, for example.
The convex portions (nodes 12b, etc.) of the intermediate portion 12 generate a supporting pressure P1 (see FIG. 6) when a force in the pulling direction is applied to the post-construction anchor 10D, so that the fixing force of the post-construction anchor 10D is increased. be able to.
In addition, the part (intermediate part 12) which has an unevenness | corrugation may be a part including not only the intermediate part of the length direction of main part 1Db but the edge part of main part 1Db. The shape of the convex portion in the intermediate portion 12 is not limited to the illustrated example and may be arbitrary.

<Post-construction anchor> (Sixth example)
FIG. 21 is a schematic view showing a part of a post-construction anchor 10E that is a sixth example of the post-construction anchor 10.
The post-construction anchor 10E may be the same as the post-construction anchor 10D shown in FIG. 20 except for the intermediate portion 12A of the main portion 1Eb.
A male screw (unevenness) is formed on the outer peripheral surface of the intermediate portion 12A. It is preferable that the maximum external dimension of the male screw of the intermediate portion 12A is larger than the maximum external dimension (outer diameter) of the end side portion 13.
Since the male screw of the intermediate portion 12A generates a supporting pressure when a force in the pulling direction is applied to the anchor body 1E, the fixing force of the post-installed anchor 10E can be increased.

<Post-construction anchor> (Seventh example)
FIG. 22 is a schematic view showing a part of a post-construction anchor 10F that is a seventh example of the post-construction anchor 10.
The post-construction anchor 10F may be the same as the post-construction anchor 10D shown in FIG. 20 except for the intermediate portion 12B of the main portion 1Fb.
Knurls (unevenness) are formed on the outer peripheral surface of the intermediate portion 12B. This knurl may be, for example, a cross-hatched shape or a beveled shape. Since the knurling generates a supporting pressure when a force in the pulling direction is applied to the anchor main body 1F, the fixing force of the post-construction anchor 10F can be increased.

<Post-construction anchor> (8th example)
FIG. 23 is a schematic view showing a part of a post-construction anchor 10G that is an eighth example of the post-construction anchor 10.
The post-construction anchor 10G includes an anchor body 1G and four fixing bodies 2 (2G1 to 2G4) attached to the anchor body 1G. The four fixing bodies 2 (2G1 to 2G4) are arranged in the length direction of the anchor body 1 in this order.
The first fixing body 2G1 is provided at one end of the anchor main body 1G. The fourth fixing body 2G4 is provided at the other end of the anchor main body 1G.
The first fixing body 2G1 and the second fixing body 2G2 are attached to the anchor main body 1G with an interval in the length direction of the anchor main body 1G. The enlarged portions 2c and 2c of the fixing bodies 2G1 and 2G2 have a cross-sectional area that increases in a direction away from each other.
The third fixing body 2G3 and the fourth fixing body 2G4 are attached to the anchor main body 1G with an interval in the length direction of the anchor main body 1G. The enlarged portions 2c and 2c of the fixing bodies 2G3 and 2G4 have a cross-sectional area that increases in a direction away from each other. The second fixing body 2G2 and the third fixing body 2G3 are attached to the anchor main body 1G without a gap.
The post-installation anchor 10G has two pairs of fixing bodies 2, that is, a pair of fixing bodies 2 (2G1, 2G2) and a pair of fixing bodies 2 (2G3, 2G4). Note that the number of the fixing members 2 may be three or more.
Since the post-construction anchor 10G has a plurality of pairs of fixing bodies 2, the support pressure generated when a force in the pulling direction is applied to the anchor main body 1G can be increased as compared with the post-construction anchor having a pair of fixing bodies. it can.

<Post-construction anchor> (9th example)
FIG. 24C is a schematic view showing a part of a post-construction anchor 10H which is a ninth example of the post-construction anchor 10.
The post-construction anchor 10H is different from the post-construction anchor 10 shown in FIG. 3 in that the fixing body 2H is fixed to the end portion of the anchor main body 1H by uneven fitting.
One or a plurality of fitting projections 1Ha are formed at both ends of the anchor main body 1H. The fitting convex portion 1Ha protrudes from the outer peripheral surface of the anchor main body 1H outward in the radial direction of the anchor main body 1H.
In the fixing body 2H, a fitting recess 2Ha into which the fitting protrusion 1Ha of the anchor body 1H is fitted is formed on the end surface of the other end 22 (large diameter end). The fixing body 2H is restricted from moving in the length direction of the anchor main body 1H by fitting the fitting convex portion 1Ha of the anchor main body 1H into the fitting concave portion 2Ha.

The post-construction anchor 10H can be manufactured as follows, for example.
As shown in FIGS. 24A and 24B, after the fixing body 2H is extrapolated to the anchor main body 1H, a fitting convex portion 1Ha is formed at one end of the anchor main body 1H by press working, heat treatment or the like. . One fixing member 2H is moved to one end portion of the anchor body 1, and the fitting convex portion 1Ha and the fitting concave portion 2Ha are fitted.
A fitting convex portion 1Ha is also formed on the other end portion of the anchor main body 1H, and the other fixing body 2H is moved to the other end portion of the anchor main body 1 so that the fitting convex portion 1Ha and the fitting concave portion 2Ha are fitted. . In this way, the post-construction anchor 10H shown in FIG. 24 (c) is obtained.

<Post-construction anchor> (10th example)
FIG. 25 is a schematic view showing a part of a post-construction anchor 10I which is a tenth example of the post-construction anchor 10.
The post-construction anchor 10I is different from the post-construction anchor 10 shown in FIG. 3 in that the fixing body 2I is fixed to the anchor main body 1I by the fixture 5 (pin).
A mounting hole 2Ia that penetrates the fixing member 2I in the thickness direction is formed on the side surface of the fixing member 2I. The anchor body 1I is formed with an insertion hole 1Ia along the radial direction of the anchor body 1I. The insertion hole 1Ia may be formed through the anchor body 1I. The fixture 5 includes, for example, a head portion 5a and an extending portion 5b extending from the head portion 5a.
In the post-construction anchor 10I, the extension portion 5b of the fixing tool 5 is inserted into the insertion hole 1Ia of the anchor main body 1I, and the head portion 5a is disposed in the attachment hole 2Ia of the fixing body 2I, whereby the fixing body 2I is anchored. It can be positioned with respect to the main body 1I.

<Post-construction anchor> (11th example)
FIG. 26 is a schematic view showing a part of a post-construction anchor 10J that is an eleventh example of the post-construction anchor 10.
The post-construction anchor 10J is different from the post-construction anchor 10 shown in FIG. 3 in that the fixing body 2J is fixed to the anchor main body 1J by pressure bonding.
The post-installed anchor 10J reduces the diameter of the fixing body 2J by applying a force inward in the longitudinal direction to the fixing body 2J in a state where the fixing body 2J is extrapolated to the anchor body 1J, and the fixing body 2J is attached to the anchor body 1J. Can be fixed.

<Post-construction anchor> (12th example)
FIG. 27 is a schematic view showing a part of a post-construction anchor 10K which is a twelfth example of the post-construction anchor 10.
The post-construction anchor 10K is different from the post-construction anchor 10 shown in FIG. 3 in that the fixing body 2K is fixed to the anchor main body 1K at the joint 6 by friction welding or welding. The fixing body 2K may have a solid structure.
The post-construction anchor 10K, for example, rotates the fixing body 2K or the anchor main body 1K around the central axis in a state where the end face of the one end 21 (small diameter end) of the fixing body 2K faces the end face of the anchor main body 1K. It can be manufactured by friction welding the end surface of the one end 21 of the fixing body 2K and the end surface of the anchor main body 1K.
The post-construction anchor 10K may be manufactured by welding the end surface of the one end 21 of the fixing body 2K and the end surface of the anchor main body 1K.

<Post-construction anchor> (13th example)
FIG. 28 (c) is a schematic view showing a part of a post-construction anchor 10 </ b> L that is a thirteenth example of the post-construction anchor 10.
The post-construction anchor 10L is different from the post-construction anchor 10 shown in FIG. 3 in that the fixing body 2L has a structure including a main body 2La and a fitting portion 2Lb instead of an integral structure.
As shown in FIG. 29A, the main body 2La of the fixing body 2L includes a truncated cone base 7a, a cylindrical intermediate portion 7b protruding from the small diameter end surface 7a1 of the base 7a, and an intermediate portion 7b. And a frustoconical reduced diameter portion 7c that protrudes while reducing the diameter from the tip 7b1. The base part 7a, the intermediate part 7b, and the reduced diameter part 7c have a common central axis. The main body 2La is composed of a pair of divided bodies 7d and 7d. The divided body 7d has a shape in which the main body 2La is divided into two along the central axis.
As shown in FIG. 29B, the fitting portion 2Lb is a truncated cone-shaped annular body, and the inner diameter thereof is the same as or slightly larger than the outer diameter of the intermediate portion 7b of the main body portion 2La.
In the fixing body 2L, it is preferable that the main body portion 2La and the fitting portion 2Lb have a truncated cone shape as a whole in a state where the fitting portion 2Lb is extrapolated to the intermediate portion 7b of the main body portion 2La.

The post-construction anchor 10L can be manufactured as follows, for example.
As shown in FIGS. 28A and 28B, the fitting portion 2Lb is extrapolated to the anchor main body 1L, and the divided bodies 7d and 7d are arranged at the end of the anchor main body 1L. Next, the fitting portion 2Lb is extrapolated to the intermediate portion 7b of the main body portion 2La. In this way, the post-construction anchor 10L shown in FIG.

<Post-construction anchor> (14th example)
FIG. 30 is a schematic view showing a part of a post-construction anchor 10M which is a fourteenth example of the post-construction anchor 10.
The post-construction anchor 10M is different from the post-construction anchor 10 shown in FIG. 3 in that the fixing body 2M is fixed to the anchor main body 1M by the fixture 8 (screw type fixture).
The fixing body 2M is divided at a slit-shaped dividing portion 9 along the central axis direction. An attachment recess 14e and an attachment hole 14c communicating with the attachment recess 14e are formed in one of the one divided edge portions 14 (14a) divided by the division portion 9. The other split edge portion 14 (14b) is formed with an insertion hole 14d having a female screw formed on the inner peripheral surface.
The fixture 8 includes, for example, a head portion 8a and an extending portion 8b extending from the head portion 8a. A male screw is formed on the outer peripheral surface of the extending portion 8b.
In the post-construction anchor 10M, the head portion 8a of the fixture 8 is disposed in the mounting recess 14e of the fixing body 2M, and the extension portion 8b is inserted through the mounting hole 14c and the insertion hole 14d, and is screwed into the insertion hole 14d. be able to. The fixing body 2M can be reduced in diameter by screwing with the fixing tool 8 and fixed to the anchor main body 1M.

<Post-construction anchor> (15th example)
FIG. 31 is a schematic view showing a part of a post-construction anchor 10N that is a fifteenth example of the post-construction anchor 10.
In the post-installed anchor 10N, a slit 16a is formed on the fixing body 2N fixed to the end of the anchor body 1N by a plurality of slits 16a from the other end 22 (large diameter end) to one end 21 (small diameter end). The frustoconical press-fit body 17 is press-fitted into the slit portion 16. The press-fit body 17 is locked to the divided portion 16b in a state where the divided portion 16b of the slit portion 16 is expanded.

<Post-construction anchor> (16th example)
FIG. 32 (b) is a schematic view showing a part of a post-construction anchor 10 </ b> P that is a sixteenth example of the post-construction anchor 10.
As shown in FIG. 32 (a), in the post-construction anchor 10P, the slit 18a is formed in the fixing body 2P by a plurality of slits 18a from one end 21 (small diameter end) to the other end 22 (large diameter end). ing. The end 19 of the anchor main body 1P has a tapered shape. The end portion 19 is press-fitted into the slit portion 18 of the fixing body 2P, and is locked to the split portion 18b in a state where the split portion 18b of the slit portion 18 is expanded.

<After construction anchor> (17th example)
FIG. 33 is a schematic diagram showing a post-construction anchor 10Q that is a seventeenth example of the post-construction anchor 10.
The post-installed anchor 10Q includes an anchor main body 1Q and a fixing body 2 attached to one end of the anchor main body 1Q.
The anchor main body 1Q includes a first end portion 24 (main portion 1Qb) having a smooth surface without unevenness, and a second end portion 25 (fixed portion) having surface unevenness.
The one end side portion 24 is a portion including one end portion of the anchor main body 1Q. The one end side portion 24 is made of, for example, a PC steel bar (round steel bar) and can have a circular cross section.
The other end side portion 25 is a portion including the other end portion of the anchor main body 1Q. The other end portion 25 is made of, for example, a deformed reinforcing bar, and has, on the surface, for example, a rib 25a that is a convex portion along the length direction of the anchor main body 1Q, and a node 25b that is a convex portion along the circumferential direction of the anchor main body 1Q. Projecting from the outer surface 25c. The maximum outer dimensions (dimensions in the direction perpendicular to the extending direction of the anchor body 1Q) of the convex portions (ribs 25a and nodes 25b) are preferably larger than the maximum outer dimension (outer diameter) of the one end side portion 24. The length of the other end side portion 25 can be, for example, 20 to 80% of the length of the anchor main body 1Q excluding the portion to which the fixing body 2 is attached.
Since the convex portion (node 25b, etc.) of the other end side portion 25 generates a supporting pressure P1 (see FIG. 6) when a force in the pulling direction is applied to the post-construction anchor 10Q, the fixing force of the post-construction anchor 10Q Can be increased.
In addition, the part (other end side part 25) which has an unevenness | corrugation is not restricted to the part containing the edge part of the anchor main body 1Q, The intermediate part of the length direction of the anchor main body 1Q may be sufficient. The shape of the convex portion in the other end side portion 25 is not limited to the illustrated example, and may be arbitrary.

<Post-construction anchor> (18th example)
FIG. 34 is a schematic view showing a post-construction anchor 10 </ b> R that is an eighteenth example of the post-construction anchor 10.
The post-construction anchor 10R may be the same as the post-construction anchor 10Q shown in FIG. 33 except for the other end portion 26 (fixed portion) of the anchor main body 1R.
A male screw (unevenness) is formed on the outer peripheral surface of the other end portion 26. It is preferable that the male screw maximum outer dimension of the other end side portion 26 is larger than the maximum outer dimension (outer diameter) of the one end side portion 24. Since the male screw of the other end portion 26 generates a supporting pressure when a force in the pulling direction is applied to the anchor main body 1R, the fixing force of the post-installed anchor 10R can be increased.

<Post-construction anchor> (19th example)
FIG. 35 is a schematic view showing a post-construction anchor 10 </ b> S that is a nineteenth example of the post-construction anchor 10.
The post-installed anchor 10S includes an anchor main body 1S, a fixing body 2 attached to one end of the anchor main body 1S, and a fixing body 27 (fixed portion) provided at the other end of the anchor main body 1S.
The anchor body 1S is made of, for example, a PC steel bar (round steel bar), and the surface of the main part 1Sb is smooth without any irregularities.
The fixing body 27 is formed in a plate shape perpendicular to the anchor main body 1S, for example. The shape of the fixing body 27 is not particularly limited, and may be a circle, a rectangle, or the like. The outer dimension of the fixing body 27 (dimension in the direction orthogonal to the extending direction of the anchor body 1S) is larger than the outer diameter of the main portion 1Sb of the anchor body 1S. Therefore, the fixing body 27 can generate a support pressure when a force in the pulling direction is applied to the anchor body 1S, and can increase the fixing force of the post-construction anchor 10S.

<Post-construction anchor> (20th example)
FIG. 36 is a schematic view showing a part of a post-construction anchor 10T that is a twentieth example of the post-construction anchor 10.
The post-construction anchor 10T includes an anchor main body 1T and four fixing bodies 2 (2T1 to 2T4) attached to the anchor main body 1T. The four fixing bodies 2 (2T1 to 2T4) are arranged in the length direction of the anchor body 1 in this order. The four fixing bodies 2 (2T1 to 2T4) are provided at intervals in the length direction of the anchor main body 1T.
The first fixing body 2T1 is provided at one end of the anchor main body 1T. The fourth fixing body 2T4 is provided at the other end of the anchor main body 1T. The enlarged portions 2c and 2c of the first fixing body 2T1 and the fourth fixing body 2T4 increase in cross-sectional area in a direction away from each other.
The second fixing body 2T2 and the third fixing body 2T3 are attached to the anchor main body 1T at an interval in the length direction of the anchor main body 1T. The enlarged portions 2c and 2c of the fixing bodies 2T2 and 2T3 have a cross-sectional area that increases in a direction away from each other.
The separation distance between the first fixing body 2T1 and the second fixing body 2T2 is equal to the separation distance between the third fixing body 2T3 and the fourth fixing body 2T4.
The post-installation anchor 10T has a pair of fixing bodies 2 (2T1, 2T4) and a pair of fixing bodies 2 (2T2, 2T3).

<Post-construction anchor> (21st example)
FIG. 37 is a schematic view showing a part of a post-construction anchor 10U that is a twenty-first example of the post-construction anchor 10.
The post-construction anchor 10U has the same configuration as the post-construction anchor 10T shown in FIG. 36 except that the third fixing body 2T3 is not provided.

<Post-construction anchor> (22nd example)
FIG. 38 is a schematic view showing a part of a post-construction anchor 10V that is a twenty-second example of the post-construction anchor 10.
The post-construction anchor 10V is different from the second fixing body 2T2 and the third fixing body 2T3 in the post-construction anchor 10T shown in FIG. 36 except that the orientations of the second fixing body 2V2 and the third fixing body 2V3 are different from those in FIG. It is the structure similar to the post-construction anchor 10T shown in FIG.
The enlarged portions 2c and 2c of the first fixing body 2T1 and the second fixing body 2V2 increase in cross-sectional area in a direction away from each other. The enlarged portions 2c and 2c of the third fixing body 2V3 and the fourth fixing body 2T4 increase in cross-sectional area in a direction away from each other.

<Post-construction anchor> (23rd example)
FIG. 39 is a schematic view showing a part of a post-construction anchor 10 </ b> W that is a twenty-third example of the post-construction anchor 10.
The post-installation anchor 10W is the post-installation shown in FIG. 36 except that the separation distance between the first fixing body 2T1 and the second fixing body 2T2 is smaller than the separation distance between the third fixing body 2T3 and the fourth fixing body 2T4. The configuration is the same as that of the anchor 10T.

  Since the post-construction anchors 10T, 10U, 10V, and 10W shown in FIGS. 36 to 39 have three or more fixing bodies 2, it is possible to increase the bearing pressure that is generated when a force in the pulling direction is applied to the anchor body 1T. it can.

<Post-construction anchor> (24th example)
FIG. 40 is a schematic view showing a part of a post-construction anchor 10X that is a twenty-fourth example of the post-construction anchor 10.
The fixing body 2X (fixed portion) of the post-construction anchor 10X extends from the other end 22 and the enlarged portion 2c in which the cross-sectional area gradually increases from the one end 21 (small diameter end) toward the other end 22 (large diameter end). And a constant diameter portion 28. The constant diameter portion 28 has a cylindrical shape having the same outer diameter as the other end 22 of the enlarged portion 2c, and the central axis of the constant diameter portion 28 coincides with the central axis of the enlarged portion 2c.
The fixing body 2X can be manufactured by gripping the constant diameter portion 28 and processing the enlarged portion 2c. Therefore, manufacture is easy.

<Post-construction anchor> (25th example)
FIG. 41A is a perspective view showing a part of a post-construction anchor 10Y that is a 25th example of the post-construction anchor 10. FIG.
The post-construction anchor 10Y is different from the post-construction anchor 10 shown in FIG. 3 in that the fixing body 2Y and the anchor main body 1Y are integrated.
The post-construction anchor 10Y can be manufactured as follows, for example.
As shown in FIG. 41 (b), a mold 29 having an inner surface shape suitable for the post-construction anchor 10Y is prepared. The post-construction anchor 10Y is obtained by molding the bar 30 with the mold 29 under heating.
The post-construction anchor 10Y has high mechanical strength (such as tensile strength) because the fixing body 2Y and the anchor main body 1Y are integrated. Therefore, the shear strength of the structure can be increased.

The embodiment of the present invention has been described above. However, the configuration in the embodiment is an example, and the addition, omission, replacement, and other modifications of the configuration can be made without departing from the spirit of the present invention.
For example, in the post-construction anchor 10 shown in FIG. 3 and the like, steel is exemplified as the material of the anchor main body 1 and the fixing body 2, but the material of the anchor main body 1 and the fixing body 2 is not limited to this. For example, a carbon material, fiber reinforced plastic, or the like may be used. Fixing of the fixing body to the anchor main body is not limited to screw fitting, and other fixing structures such as uneven fitting may be employed. The anchor main body 1 is not limited to a PC steel rod, and may be composed of other iron-based materials. The formation method of the external thread 1a is not specifically limited, For example, a threading process may be sufficient.

In the post-construction anchor 10 shown in FIG. 3 and the like, the shape of the fixing body 2 is a truncated cone shape. However, the fixing body 2 has a gradual cross-sectional area in which at least part of the length direction extends from one end 21 to the other end 22. It only needs to have an increasing shape, and the shape is not limited to a substantially conical shape, and may be a substantially pyramid shape, a bell shape, a bowl shape, or the like.
The fixing body 2 may not have an axially symmetric shape with the axis of the post-installed anchor 10 (anchor body 1) as an axis of symmetry. Further, the fixing body 2 does not have to have a line-symmetric shape with the axis as the symmetry line.
In the post-construction anchor 10 </ b> D shown in FIG. 20, the end portion 13 has a rib 12 a along the length direction of the anchor body 1 and a node 12 b along the circumferential direction of the anchor body 1. The unit is not limited to the illustrated configuration. For example, the convex portion may be only one or a plurality of ribs, or may be only one or a plurality of nodes.

The post-construction anchor 10 shown in FIGS. 1 and 2 is constructed on the wall body 34 that is the side wall of the reinforced concrete structure 32, but may be constructed on the lower wall 33 or the upper wall 35.
In the reinforced concrete structure 32 shown in FIGS. 1 and 2, one post-construction anchor 10 is provided in one insertion hole 50, but a plurality of post-construction anchors 10 may be provided in one insertion hole 50.
The post-construction anchors 10, 10T, 10U, 10V, and 10W shown in FIGS. 3 and 36 to 39 have 2 to 4 fixing bodies 2, but the number of the fixing bodies 2 may be an arbitrary number of 5 or more.
The fixing body 2 of the post-construction anchor 10 shown in FIG. 3 has a shape in which the cross-sectional area gradually increases from one end 21 toward the other end 22, but the fixing body has a length direction (for example, the central axis C2 direction). It suffices that the portion has a shape in which the cross-sectional area gradually increases from one end to the other end.

  The structure to which the present invention can be applied is not particularly limited, and can be applied to a structure constructed by, for example, a civil engineering technique or a building technique. The present invention can be applied to structures used for, for example, railways and roads. Specifically, in addition to those listed in the embodiment, there are an abutment, a retaining wall, a breakwater, a protective wall, and the like. The present invention can also be applied to building structures such as houses, stores, factories, office buildings, and halls, and their accompanying structures. The present invention can be applied to, for example, columns, beams, walls, floors, and the like.

10, 10A, 10B, 10C, 10D, 10E, 10F, 10G, 10H, 10I, 10J, 10K, 10L, 10M, 10N, 10P, 10Q, 10R, 10S, 10T, 10U, 10V, 10W, 10X, 10Y Construction anchor 1, 1B, 1D, 1E, 1F, 1G, 1H, 1I, 1J, 1K, 1L, 1M, 1N, 1P, 1Q, 1R, 1S, 1T, 1Y Anchor body 1a Male thread (attachment part)
1b, 1Db, 1Eb, 1Fb, 1Qb, 1Rb, 1Sb Main part (anchor body between the pair of fixing bodies)
2, 2A, 2B, 2C, 2D, 2E, 2F, 2G, 2H, 2I, 2J, 2K, 2L, 2M, 2N, 2P, 2Y
2a Screw hole 2c Enlarged portion 11 Solidified material 21 One end 22, 22A, 22B, 22C The other end 32 Reinforced concrete structure (structure)
25 Other end side (fixed part)
26 Other end side (adhering part)
50, 50A insertion hole

Claims (11)

A solidified material filled in an insertion hole formed in the structure, and a construction anchor embedded in the solidified material;
The post-installed anchor includes a rod-shaped anchor main body, and at least a pair of fixing portions provided on the anchor main body at intervals in the length direction of the anchor main body,
At least one of the pair of fixing portions has a reinforcing structure for a structure including an enlarged portion whose cross-sectional area gradually increases in a direction away from the other fixing portion from one end to the other end. The fixing portion is attached to the anchor body,
Each of the pair of fixing portions has the enlarged portion,
2. The reinforcing structure for a structure according to claim 1, wherein a maximum outer dimension of the fixing portion is larger than an outer dimension of the anchor main body at a portion between the pair of fixing portions.   The reinforcing structure for a structure according to claim 1, wherein the fixing portion has a truncated cone shape in which a sectional area gradually increases from the one end toward the other end.   The reinforcing structure for a structure according to any one of claims 1 to 3, wherein the fixing portion is detachably attached to the anchor main body. The anchor body has a main part between the pair of fixing parts and an attachment part to which the fixing parts are attached,
The mounting part is formed with a male screw,
The fixing portion is formed with a screw hole having a female screw screwed with the male screw,
The reinforcing structure according to claim 4, wherein the fixing portion is attached to the anchor body by screwing the screw hole onto the male screw.   The reinforcing structure for a structure according to any one of claims 1 to 5, wherein a maximum outer dimension of the fixing portion is smaller than an inner dimension of the insertion hole.   The reinforcing structure for a structure according to any one of claims 1 to 6, wherein a surface of the anchor main body at a portion between the pair of fixing portions is formed to be smooth.   The said insertion hole is a reinforcement structure of the structure of any one of Claims 1-7 which is a through-hole which penetrates the said structure. A drilling step of forming an insertion hole in the structure;
A filling step of filling the insertion hole with a solidifying material;
A rod-shaped anchor body; and at least one pair of anchoring portions provided on the anchor body at intervals in the length direction of the anchor body, wherein at least one of the pair of anchoring portions is from one end to the other And a step of inserting a post-installed anchor into the insertion hole, which has an enlarged portion whose cross-sectional area gradually increases in a direction away from the other fixing portion.   The post-construction anchor is embedded in the solidified material by filling the solidification material in the insertion hole by the filling step after the post-construction anchor is inserted into the insertion hole by the insertion step. How to reinforce a structure.   The method for reinforcing a structure according to claim 9, wherein after the filling material is filled in the insertion hole by the filling step, the post-construction anchor is embedded in the solidified material by the insertion step.

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