JP2002348965A - Nut fixing device and reinforcing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut fixing device and a reinforcing structure capable of restraining deformation of a structure even when tensile force exceeding an elastic limit repeatedly acts. SOLUTION: This reinforcing structure has a bolt member 52 engaged on one end side with a basic structure 40, and a nut member 53 engaged with the basic structure 40 By being threadedly engaged with the other end side of this bolt member 52. The reinforcing structure 10 has the nut fixing device 20 for urging the nut member 53 in the fastening direction to the bolt member 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is applicable to, for example, a reinforcing structure for reinforcing a building such as a steel structure or a wooden structure with braces, and a reinforcing structure for reinforcing a civil engineering structure.

[0002]

2. Description of the Related Art Conventionally, in a building structure such as a building or a house, there is a reinforcing structure having a brace as reinforcement for preventing deformation of the building due to seismic force, wind pressure or the like. Brace is a diagonal member provided on the diagonal line of a rectangular structure composed of columns and beams. When the structure is deformed by seismic force or wind pressure, it resists the deformation of this structure by tensile stress. Is what you do. In addition, in civil engineering structures such as retaining walls and bridges, there is a reinforcing structure provided with a reinforcing material to prevent deformation of a relatively fluid structure made of sand, clay, silt, or the like. Reinforcing material is steel rod, steel wire, F
It is formed of RP or the like, and when both ends are engaged with two points of the structure to deform and expand, the structure resists the deformation due to the expansion by tensile stress.

FIG. 8A shows an elevational view of a reinforcing structure 100 according to a conventional example using braces. The reinforcing structure 100 is obtained by replacing a part of the structure of a building with a mechanical model, and includes a basic structure 40 formed in a substantially square shape.
And braces 45, 46 for reinforcing by connecting diagonal lines of the basic structure 40 to each other.

The basic structure 40 includes two pillars 41 and 42,
A lower beam 44 connecting the lower ends of the columns 41 and 42 and provided on the ground 47 and an upper beam 43 connecting the upper ends of the columns 41 and 42 are provided. The pillar 41 is connected to the upper beam 43 at a connection portion A at the upper end thereof, and is connected to the lower beam 44 at a connection portion B at the lower end thereof. The pillar 42 is connected to the upper beam 43 at a connection portion C at the upper end thereof, and is connected to the lower beam 44 at a connection portion D at the lower end thereof.

The connecting portions A, B, C, and D are rotatable about a horizontal direction, and the basic structure 40 is an unstable structure. In each of the connecting portions A to D, there is provided a plate 50 having a through-hole 51 and straddling the columns 41 and 42 and the upper and lower beams 43 and 44 adjacent to each other. The rotational movement of each of the connecting parts A to D is not hindered.

The brace 45 connects the plate 50 at the connecting portion C between the column 42 and the upper beam 43 and the plate 50 at the connecting portion B between the column 41 and the lower beam 44. The brace 46 connects the plate 50 of the connecting portion A of the column 41 and the upper beam 43 to the plate 50 of the connecting portion D of the column 42 and the lower beam 44. Each brace 45,
Reference numeral 46 denotes a bolt member 52 inserted into the insertion hole 51 of each plate 50, and two nut members 5 screwed to both ends of the bolt member 52 and engaged with the outside of each plate 50.
3 and the plates 50 are deformed in the direction in which they approach each other, but no internal stress is generated, but when the plates 50 are deformed in the direction in which they are separated from each other, tensile stress is generated in each bolt member 52. Therefore, each brace 45, 46
Accordingly, the reinforcing structure 100 is a primary indeterminate structure. Further, the distance between the nut members 53 at both ends of the bolt member 52 is equal to the distance between the connecting portions BC and the distance between the connecting portions AD, and is L.

FIG. 8B is an elevation view when a horizontal force P is applied to the reinforcing structure 100. Reinforcement structure 1
At 00, a horizontal force P is applied to the connecting portion A of the column 41 in FIG.
(B) When added in the direction of the middle arrow (hereinafter referred to as the positive direction), the upper end of the column 41 moves by δ in the positive direction. At this time, the distance between the connecting portions A-D is reduced, but the brace 46
Is engaged with the outside of the plate 50, so that neither a tensile force nor a compressive force acts on the brace 46. On the other hand, connecting portion B
Since the distance between −C increases, a tensile force acts on the brace 45, and the brace 45 resists deformation of the basic structure 40.

Although not shown, when the horizontal force P is applied in the negative direction, the distortion δ gradually increases in the negative direction.
At this time, since the distance between the connecting parts BC is reduced, neither the tensile force nor the compressive force acts on the brace 45, but the connecting parts A-C
Since the distance between D is increased, a tensile force acts on the brace 46, and the brace 46 resists deformation of the basic structure 40.

[0009]

However, for example, when a horizontal force P acts in a positive direction, the brace 45 is elastically deformed by a tensile force, but when the elastic force exceeds the elastic limit of the brace 45, the brace 45 is elastically deformed. Undergoes plastic deformation, and residual strain is generated even when the horizontal force P is released. Thereafter, when the horizontal force P acts again in the positive direction, the residual strain is generated to overlap the already generated residual strain, and a phenomenon has occurred in which the residual strain is accumulated.

FIG. 9 shows the relationship between the horizontal force P applied to the reinforcing structure 100 according to the conventional example and the distortion δ due to the horizontal force P. (ST1-1) In the reinforcing structure 100, when the horizontal force P is applied to the connecting portion A of the column 41 in the positive direction, the upper end of the column 41 moves by δ in the positive direction. At this time, assuming that the tensile force acting on the brace 45 is T and the strain generated in the brace 45 by the tensile force T is Y, the horizontal force P and the strain δ of the reinforcing structure 100 are represented by the following equations.

[0011]

(Equation 1)

When the sectional area of the brace 45 is S and the Young's modulus is E, the relationship between the tensile force T and the strain Y and the relationship between the horizontal force P and the strain δ of the brace 45 are as follows. .

[0013]

(Equation 2)

Therefore, when the horizontal force P is gradually increased from 0, the strain δ also increases from 0, and the strain δ increases in proportion to the applied horizontal force P up to the elastic limit of the brace 45.
Here, the reinforcing structure 10 at the elastic limit of the brace 45 is used.
A horizontal force P and a strain δ of 0 are defined as P ₁ and δ ₁ , respectively. Although the elasticity limit is strictly different from the proportionality limit, it is difficult to distinguish between them.

(ST1-2) The horizontal force P falls below the elastic limit.
Horizontal force P₁Exceeds, the bolt member of the brace 45
52, the horizontal force P becomes almost P₁As it is
Even if there is distortion δ ₁To increase from. Distortion δ₂Reached
Until the horizontal force P is applied.

(ST1-3) Thereafter, when the horizontal force P is gradually reduced, the distortion δ also gradually decreases. However, even if the horizontal force P is completely removed and becomes zero, the distortion δ does not become zero. The residual strain δ ₃ (= δ ₂ −δ ₁ ) due to the plastic deformation of the brace 45 is generated in the reinforcing structure 100.

(ST1-4) to (ST1-6) This time,
When the horizontal force P is applied in the negative direction, neither the compressive force nor the tensile force acts on the brace 45, and the tensile force acts on the brace 46. Therefore, the strain δ gradually increases from 0 to the negative direction. Therefore, the graph is point-symmetric with respect to the origin (ST1-1) to (ST1-3). The horizontal force P applied in the negative direction generates a residual strain −δ ₃ .

[0018] (ST1-7) again, the addition of horizontal force P in the positive direction, the force pulling the brace 45 is applied, since the reinforcing structure 100 is residual strain [delta] ₃ has already been generated, the horizontal force Even when P is almost 0, the strain δ is −δ
A phenomenon that increases from ₃ to δ ₃ (hereinafter referred to as a slip phenomenon) occurs. Therefore, the strain δ is equal to the residual strain δ ₃
, The strain δ increases in proportion to the applied horizontal force P up to the elastic limit (horizontal force P ₁ , strain δ ₂ ), and consequently follows (ST1-3) in reverse. It becomes a graph.

[0019] (ST1-8) horizontal force P exceeds the horizontal force _{P 1} in the elastic limit, the plastic deformation of the brace 45 starts, the horizontal force P approximately distortion be left _{P 1} [delta] is [delta] ₂ To increase from. Horizontal force P to the strain [delta] reaches [delta] ₄
Has been added.

(ST1-9) Thereafter, the horizontal force P is gradually increased.
When it is decreased, the distortion δ also gradually decreases, but the horizontal force P becomes
Even if it is completely removed and becomes 0, the distortion δ does not become 0,
Residual strain due to plastic deformation of brace 45 in reinforcement structure 100
Only δ₅(= Δ₄−δ₁) Is generated. This residual strain δ
₅Is generated by the horizontal force P initially applied in the positive direction.
Residual strain δ ₃And the second horizontal force P applied in the positive direction
And the residual strain generated by the above.

(ST1-10) to (ST1-12) Further, when the horizontal force P is applied in the negative direction, the brace 46
While the tensile force acts on, (ST1-7) and likewise slip phenomenon occurs, even in the state of the horizontal force P is approximately 0, the strain [delta] decreases from [delta] ₅ to - [delta _3. Therefore, the strain δ gradually increases in the negative direction from the residual strain −δ _3, and becomes a point-symmetric graph (ST1-7) to (ST1-9) with respect to the origin.

[0022] From the foregoing, when acted repeatedly horizontal force P of more than horizontal force P ₁ in the elastic limit, residual strain due to plastic deformation is accumulated by the slip phenomenon bolt member 52 of the brace 45, the reinforcing structure 100 It can be seen that the deformation gradually increases.

[0023] Thus, in the reinforcing structure of the building structure, if the horizontal force P of more than horizontal force P ₁ in the elastic limit of the brace is applied repeatedly by earthquakes and typhoons,
The deformation of the building increased, and the building could be damaged. Further, also in the reinforcement structure of the civil engineering structure, similarly to the building structure, a slip phenomenon occurs due to a creep phenomenon of the structure or compaction due to the seismic motion, and the structure may be damaged.

An object of the present invention is to provide a nut fixing device and a reinforcing structure that can suppress deformation of a structure even when a tensile force exceeding an elastic limit is repeatedly applied.

[0025]

In order to achieve the above object, a nut fixing device and a reinforcing structure according to the present invention employ the following constitution. The reinforcing structure according to claim 1, comprising a bolt member engaged with the structure at one end thereof, and a nut member screwed to the other end of the bolt member and engaged with the structure. And a nut fixing device for urging the nut member against the bolt member in a tightening direction.

According to the present invention, even if a tensile force exceeding the elastic limit is repeatedly applied due to, for example, an earthquake or a typhoon, the bolt member is plastically deformed and the nut member engaged with the structure is loosened. The nut member is automatically rotated by the urging force of the device, and the distortion due to these deformations is eliminated. That is, even if a gap is formed between the nut member and the structure, the gap is immediately eliminated, so that the nut member is always fixed to the structure, and accumulation of residual strain due to plastic deformation of the bolt member can be prevented. Can be suppressed.

According to a second aspect of the present invention, in the reinforcing structure of the first aspect, the nut fixing device biases an outer peripheral side of the nut member. According to the present invention, the rotational moment is larger than when the inner peripheral side is urged, so that a large rotational force can be applied to the nut member, so that the nut member can be easily fixed to the structure. .

According to a third aspect of the present invention, in the reinforcing structure of the first or second aspect, the nut fixing device includes an elastic member, and the elastic member pulls the nut member in a tightening direction. It is characterized by being energized. According to the present invention, the elastic member itself does not buckle and the urging force does not decrease, and the urging force is stably applied to the nut member as compared with the case where the nut is rotated by pressing the nut member in the tightening direction with the elastic member. Can be granted.

In the reinforcing structure according to a fourth aspect, in the reinforcing structure according to the third aspect, the elastic member is a coil spring, one end of which is supported by the bolt member.
The other end portion is connected to the nut member. According to the present invention, since the nut member is rotated while applying a reaction force to the bolt member, the nut member does not rotate together with the bolt member, and the nut member can be reliably rotated with respect to the bolt member.

According to a fifth aspect of the present invention, in the reinforcing structure of the third aspect, the elastic member is a spiral spring, one end of which is supported by the structure, and the other end of which is the spiral spring. It is characterized by being connected to a nut member. According to this invention, it is possible to use a large spiral spring and to surely rotate the nut member with a large urging force, as compared with the case where the coil spring is supported by the bolt member as in claim 4.

The reinforcing structure according to a sixth aspect of the present invention is the reinforcing structure according to the fifth aspect, wherein an anchor plate is interposed between the nut member and the structure, and the elastic member is connected to the anchor plate. Characterized by being supported by the structure via According to this invention, since the anchor plate is interposed between the structure and the structure, the nut fixing device including the elastic member can be attached without damaging the structure, and a decrease in the proof stress of the structure can be suppressed. .

According to a seventh aspect of the present invention, in the nut fixing device, the nut member screwed to the other end of the bolt member engaged with the structure at one end thereof and engaged with the structure is used. A nut fixing device for fixing to a body, wherein the nut member is urged in a tightening direction with respect to the bolt member. According to the present invention, similarly to the first aspect, even if a tensile force exceeding the elastic limit of the bolt member repeatedly acts due to an earthquake, a typhoon, or the like, distortion due to the repeated action does not accumulate and deformation of the structure is prevented. Can be suppressed.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. In the following description of the embodiments, the same components will be denoted by the same reference numerals, and description thereof will be omitted or simplified. First Embodiment FIG. 1A shows an elevation view of a building reinforcement structure 10 according to the present embodiment. Reinforcement structure 1
Numeral 0 is a structure obtained by replacing a part of the structure of the building with a mechanical model. Similar to the reinforcing structure 100 described above, a basic structure 40 as a structure formed in a substantially square shape, The braces 45 and 46 are reinforced by connecting diagonal lines to each other. The brace 45, 46 has a bolt member 52 engaged at one end thereof with the connecting portions B, A of the basic structure 40, and a connecting portion C of the basic structure 40 which is screwed to the other end side of the bolt member 52.
D, and a nut member 53 engaged with
The nut fixing device 20 is provided on the plate 50 provided at the positions .about.D.

FIG. 2 is an overall perspective view of the nut fixing device 20. The nut fixing device 20 urges the nut member 53 in the tightening direction with respect to the bolt member 52, and includes a cylindrical drum 22 and an elastic member wound around the drum 22 and connected to the nut member 53. Here, a spiral spring 23 and a fixing bolt 21 for rotatably fixing the drum 22 on the plate 50 are provided.

The drum 22 has a cylindrical core 24 having an insertion hole 26 in the center axis thereof, and a flange 25 extending at both ends of the core 24. The fixing bolt 21 is attached to the core 2
4 and is screwed to the plate 50. The spiral spring 23 is formed by winding a band-shaped leaf spring around the core 24 multiple times in a spiral shape by cold working, and pulls one end of the spirally bent state into a linear state from the bent state. Thus, the spring action is exhibited by the restoring force from the straight state to the bent state. The other end of the spiral spring 23 is the drum 22
The core 24 is connected to the core 24 by screws or the like, and is wound around the core 24.
By fixing the outer peripheral side surface of the nut member 53 to the outer peripheral side surface of the nut member 53 with a screw or the like, the outer peripheral side surface of the nut member 53 is urged by being pulled in the tightening direction. Here, both ends of the spiral spring 23 are
Although each is connected to the core 24 and the nut member 53 of the drum 22 with screws, the present invention is not limited to this, and may be connected by other methods such as bolts and welding. In addition, the spiral spring 23 is
Is not particularly limited.

In the above state, the nut member 53
Has a contact surface 53A that contacts the plate 50 on the lower surface thereof.
The plate 50 is pressed by 3A. Therefore, a static frictional force F is generated on the contact surface 53A in the direction opposite to the tightening direction of the nut member 53 in proportion to the pressing force, and the spiral spring 2
The state is in balance with the force B in the tightening direction of the nut member 53 due to the restoring force of No. 3.

The mounting method of the nut fixing device 20 is as follows.
It looks like this: First, the bolt member 52 is connected to the plate 5
The nut member 53 is screwed and fastened by inserting the nut member 53 into the through hole 51 of No. 0. Spiral spring 23 on drum 22
Is manufactured at a factory, transported to the site, and fixed to the plate 50 by the fixing bolt 21.
Subsequently, in a state where one end of the spiral spring 23 is pulled out and stretched by applying a tensile force, it is fixed to the outer peripheral side surface of the nut member 53 with a screw.

FIG. 1B shows that a horizontal force P is applied to the reinforcing structure 10.
FIG. 3 shows an elevational view when the horizontal force P is applied.
And the distortion δ due to the horizontal force P.
4A and 4B show the brace 45.
Also, the relationship between the tensile force T acting on the brace 46 and the strain Y due to this tensile force is shown.

(ST2-1) In the reinforcing structure 10, when a horizontal force P is applied to the connecting portion A of the column 41 in the direction of the arrow in FIG. 1B (hereinafter referred to as the positive direction), the upper end of the column 41 It moves in the positive direction by δ, and becomes a graph similar to (ST1-1). That is, when the horizontal force P is gradually increased from 0, as shown in FIG. 4A, the tensile force T acts on the brace 45 to elastically deform, and the strain Y increases from 0 to reach the elastic limit. The strain Y increases in proportion to the tensile force T.
Here, assuming that the tensile force T and the strain Y at the elastic limit of the brace 45 are T ₁ and Y ₁ , respectively, the horizontal force P ₁ and the strain δ _{1 at} the elastic limit of the reinforcing structure 10 are represented by the following equations.

[0040]

(Equation 3)

With such a deformation of the reinforcing structure 10,
Since the distance between the connecting portions A-D is shortened by _{Y 1,} since the nut member 53 of the brace 46 move away from the plate 50, the plate contact surface 53A of the nut member 53 5
The pressing force to zero decreases, and the static friction force F decreases accordingly (see FIG. 2). On the other hand, since the force B in the tightening direction of the nut member 53 due to the restoring force of the spiral spring 23 of the nut fixing device 20 is constant, the force B in the tightening direction of the nut member 53 becomes larger than the static friction force F, The member 53 rotates in the tightening direction. Then, the nut member 53
Is rotated, the contact surface 53A of the nut member 53 is pressed against the plate 50 again, and the pressing force increases. A dynamic frictional force F 'is generated in proportion to this pressing force, and the force in the tightening direction of the nut member 53 is increased. The force resists the force B, and the rotation of the nut member 53 stops when the force B is balanced with the force B in the tightening direction. Accordingly, as shown in FIG. 4 (B), because the fact the nut member 53 is always in close contact with the plate 50 by a nut fixing device 20, shrunk distance Y ₁ between the nut member 53, the strain Y of brace 46 , the -Y _1.

[0042] (ST2-2) the tensile force T of the brace 45 is greater than the force _{T 1} Tensile at elastic limit, that is, when the horizontal force P applied to the reinforcing structure 10 is greater than _{P 1,} (ST1-
Similar to 2), the plastic deformation of the bolt member 52 of the brace 45 will begin pulling force T is nearly distortion Y be left T ₁ is increased from Y _1. When the strain Y of the brace 45 is assumed to applied tensile force T ₁ until it reaches the Y _2, strain [delta] ₂ of the reinforcing structure 10 is expressed by the following equation.

[0043]

(Equation 4)

With such deformation of the reinforcing structure 10,
The distance between the connecting parts AD is further Y ₂To shrink
The distortion Y of the brace 46 due to the nut fixing device 20 is −
Y₂Becomes

[0045] (ST2-3) Then, when gradually reducing the horizontal force P from _{P 1,} the tensile force T acting on the brace 45 is reduced from _{T 1,} along with this, also the strain Y of the brace 45 Y decreased from _2, also decreases from [delta] ₂ strain [delta] of the reinforcing structure 10. With such a deformation of the reinforcing structure 10,
Since the nut member 53 of the brace 46 is engaged without slack on the plate 50 increases, the tensile force T is generated which acts on the brace 46, with gradually increased from 0, the strain Y also -Y ₂ braces 46 I do. As a result, when the horizontal force P becomes 0, the tensile force T acting on the brace 45 by the brace 46 and the brace 4
6, the tensile force T ₃ acting on the braces 45 and 46 at this time, the strain Y ₃ , and the strain δ ₃ of the reinforcing structure 10 are expressed by the following equations. You.

[0046]

(Equation 5)

Therefore, (ST2-
The inclination of the graph of 3) is ２ of the inclination of the graph of (ST2-1).

(ST2-4) Next, the reinforcing structure 10 is filled with water.
When the flat force P is applied in the negative direction,
Tensile force T by brace 45₃In addition to the horizontal force P
The tensile force T gradually increases, and the tensile force T at the elastic limit is increased.
₁Until the strain Y becomes -Y in proportion to the tensile force T. ₃Increase from
I do. Strain of brace 46 at elastic limit-Y₄Is
It is represented by the following equation.

[0049]

(Equation 6)

[0050] In brace 45, by deformation of the reinforcing structure 10 by the horizontal force P, the force T pulling by brace 46 is gradually decreased from T _3, the force T ₁ pulling tension T acting on the brace 46 is in elastic limit At the same time, the tensile force T of the brace 45 becomes 0, and the strain Y becomes Y
Consisting of ₃ and _{Y 4.} Therefore, the horizontal force P ₄ and the strain δ ₄ of the reinforcing structure 10 are represented by the following equations.

[0051]

(Equation 7)

[0052] (ST2-5) the tensile force T of the brace 46 is greater than the force _{T 1} Tensile at elastic limit, that is, when the horizontal force applied to the reinforcing structure 10 is more than _{P 4,} (ST2-
Similar to 2), the plastic deformation of the bolt member 52 begins a brace 46, a tensile force T is nearly distortion Y be left T ₁ is increased from -Y _4. Strain Y of braces 46 is assumed to tension T ₁ is applied to reach 0 (FIG. 4
(A)). Further, since the distance between the connecting portions BC is reduced with the deformation of the reinforcing structure 10, the nut fixing device 2
0 narrowed the distance between the nut member 53 of the brace 46 by the distortion Y brace 45 is made from _{Y 4} 0.
Therefore, the strain δ of the reinforcing structure 10 becomes zero.

[0053] (ST2-6) Then, when gradually reducing the horizontal force P from _{P 1,} the tensile force T acting on the brace 46 is reduced from _{T 1,} along with this, also the strain Y of the brace 46 0 And the strain δ of the reinforcing structure 10 also decreases from zero. Therefore, since the nut member 53 of the brace 45 is engaged with the plate 50 without loosening, the brace 45
Is generated, and the tensile force T gradually increases from 0, and the strain Y of the brace 45 also increases from 0. As a result, when the horizontal force P becomes 0, the tensile force T acting on the brace 45 by the brace 46 and the tensile force T acting on the brace 46 by the brace 45 are in a state of being equally balanced. The acting tensile force T ₆ , strain Y ₆ , and strain δ ₆ of the reinforcing structure 10 are represented by the following equations.

[0054]

(Equation 8)

Therefore, (ST2-
The inclination of the graph of 6) is the same as that of the graph of (ST2-3).
And the tension of the brace 45 and the brace 46
Force T ₆Is T₃And the distortion Y₆Is Y₃Almost equal to
It's getting worse.

[0056] (ST2-7) again, the addition of horizontal force P in the positive direction to the reinforcing structure 10, the brace 45, in addition to the force _{T 6} tensile by braces 46, gradually increasing tensile force due to the horizontal force P and, until a force T ₁ tensile in the elastic limit distortion Y in proportion to the tensile force T increases from Y _6.
Distortion _{Y 7} of the brace 45 in the elastic limit is approximately equal and _{Y 1.} In the brace 46, the horizontal force P
By deformation of the reinforcing structure 10 by pulling force gradually decreases due to the brace 45, the tensile force T acting on the brace 45 to reach the force T ₁ Tensile at elastic limit at the same time,
The tensile force T of the brace 46 becomes 0, and the strain Y becomes −Y ₆
The -Y ₇ from. At this time, the horizontal force P ₇ of the reinforcing structure 10
Is approximately equal to P ₁ and the distortion δ ₇ is approximately equal to δ ₁ .

By repeating the above behavior, the reinforcing structure
Horizontal force P at elastic limit ₁Act repeatedly
Even if the
It can be seen that can be suppressed.

Therefore, according to the present embodiment, the following effects can be obtained. (1) Since the nut fixing device 20 for urging the nut member 53 in the tightening direction is provided in the reinforcing structure 10, for example, a tensile force exceeding the elastic limit is repeatedly applied due to an earthquake, a typhoon, or the like, and the bolt member 52 is plastically deformed. Even if the nut member 53 engaged with the reinforcing structure 10 is loosened, the nut member 53 is automatically rotated by the urging force of the nut fixing device 20, and the distortion due to plastic deformation is eliminated. That is, even if a gap is formed between the nut member 53 and the plate 50, the gap is immediately eliminated, so that the nut member 53 is always fixed to the plate 50, and accumulation of residual strain due to plastic deformation of the bolt member 52 can be prevented. In addition, the deformation of the reinforcing structure 10 can be suppressed.

(2) The nut fixing device 20 uses the nut member 5
Since the outer peripheral side surface of the nut 3 is urged, the rotational moment is larger than when the inner peripheral side is urged, so that a large rotational force can be applied to the nut member 53. Can be fixed.

(3) Spiral spring 2 in nut fixing device 20
3, the tension force is applied to the spiral spring 23, and the nut member 53 is pulled and rotated in the tightening direction by the restoring force from the linear state. Therefore, when the nut member 53 is rotated by pushing in the tightening direction. Compared to spiral spring 2
The urging force can be stably applied to the nut member 53 without the buckling itself being caused by the buckling of the urging force.

(4) Since the spiral member 23 is supported on the plate 50 and the nut member 53 is rotated, a large spiral spring can be used, which is larger than the case where the coil member is supported on the bolt member 52. The nut member 53 can be reliably rotated by the urging force.

[Second Embodiment] FIG. 5 shows a second embodiment of the present invention.
FIG. 2 is an overall perspective view of a nut fixing device 30 according to the embodiment. In the present embodiment, the nut fixing device 30 is a first fixing device.
Unlike the embodiment, the whole is a coil spring, one end of which is welded and supported near the end of the bolt member 52,
The other end is connected to the outer peripheral surface of the nut member 53 by welding. As a method for mounting the nut fixing device 30, first, the bolt member 52 is inserted into the insertion hole 51 of the plate 50, and the nut member 53 is screwed and tightened. Then, one end of the nut fixing device 30 is welded to the vicinity of the end of the bolt member 52, and the nut fixing device 30 is welded.
Is welded and fixed to the nut member 53 in a state where the other end is pulled in a direction in which the nut member 53 is loosened, that is, in a state where a shear force is applied to the coil spring.

Therefore, according to the present embodiment, the following effects are obtained in addition to the effects (1) and (2) described in the first embodiment. (5) Since the nut member 53 is rotated while applying a reaction force to the bolt member 52, the nut member 53 does not rotate together with the bolt member 52, and the nut member 53 is reliably rotated with respect to the bolt member 52. Can be.

[Third Embodiment] FIG. 6 shows a third embodiment of the present invention.
The reinforcement structure 60 according to the embodiment is shown. The reinforcing structure 60 includes a reinforced concrete plate 61 buried in the ground, a reinforced concrete plate 62 provided on the ground, and an embankment layer 63 as a structure interposed between the plates 61 and 62. And two reinforcing members 64 penetrating the embankment layer 63 and connecting the plates 61 and 62. In the reinforcing structure 60, the reinforcing material 64 tightens the embankment layer 63 via the plates 61 and 62, thereby eliminating voids between the soil particles constituting the embankment layer 63 and improving the proof stress as a structure. ing.

The reinforcing member 64 has a structure similar to that of the braces 45 and 46 in the first embodiment. A nut member 53 at one end is embedded in the plate 61 to be integrated with the plate 61, and at the other end. Nut member 53 is plate 6
2 is engaged. The nut fixing device 20 is provided on the plate 62, and is connected to the nut member 53 of the reinforcing member 64. Therefore, according to the present embodiment, the first
There are the same effects as (1) to (4) described in the embodiment.

It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved. For example, in the first embodiment, the nut fixing device 20 is directly
However, the present invention is not limited to this. An anchor plate is interposed between the nut member 53 and the plate 50, and the nut fixing device 2 is interposed via the anchor plate.
0 may be supported by the plate 50. By doing so, the nut fixing device 20 can be mounted without damaging the reinforcing structure 10.
Can be attached, and a decrease in the structural strength of the reinforcing structure 10 can be suppressed.

In the first embodiment, the nut member 53 is urged by pulling the nut member 53 in the tightening direction by the restoring force from the state where the spiral spring 23 of the nut fixing device 20 is pulled. The direction in which the spiral 23 is wound may be reversed, and the nut member 53 may be biased by pushing the nut member 53 in the tightening direction with a restoring force from the contracted state of the spiral spring 23.

In the second embodiment, the nut fixing device 30 is urged by applying a shearing force to the nut fixing device 30 and pulling the nut member 53 in the tightening direction with a restoring force from the state in which the nut member 53 is extended in the loosening direction. However, the present invention is not limited to this, and as shown in FIG. Nut member 5
3 may be biased by pushing in the tightening direction.

In each embodiment, the elastic member is
Although a coil spring and a spiral spring are used, the invention is not limited to this, and other springs such as a leaf spring may be used.

[0070]

According to the nut fixing device and the reinforcing structure of the present invention, the following effects can be obtained. Since the nut fixing device that urges the nut member in the tightening direction is provided, for example, a tensile force exceeding the elastic limit is repeatedly applied due to an earthquake or a typhoon, and the bolt member is plastically deformed and the nut is engaged with the structure. Even when the member is loosened, the nut member is automatically rotated by the urging force of the nut fixing device, and the distortion due to these deformations is eliminated. That is, even if a gap is formed between the nut member and the structure, the gap is immediately eliminated, so that the nut member is always fixed to the structure, and accumulation of residual strain due to plastic deformation of the bolt member can be prevented. Can be suppressed.

[Brief description of the drawings]

FIG. 1 is an elevational view showing before and after a horizontal force is applied to a reinforcing structure according to a first embodiment of the present invention.

FIG. 2 is an overall perspective view of a nut fixing device according to the embodiment.

FIG. 3 is a diagram showing a relationship between a horizontal force applied to the reinforcing structure according to the embodiment and distortion due to the horizontal force.

FIG. 4 is a diagram showing a relationship between a tensile force acting on a bolt member of the reinforcing structure according to the embodiment and a strain due to the tensile force.

FIG. 5 is an overall perspective view showing a nut fixing device according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a reinforcing structure according to a third embodiment of the present invention.

FIG. 7 is an overall perspective view showing a nut fixing device according to a modification of the present invention.

FIG. 8 is an elevation view showing before and after a horizontal force is applied to a reinforcing structure according to a conventional example.

FIG. 9 is a diagram illustrating a relationship between a horizontal force applied to a reinforcing structure according to a conventional example and a distortion due to the horizontal force.

[Explanation of symbols]

 10, 60, 100 Reinforcement structure 20, 30 Nut fixing device 23 Spiral spring as elastic member 40 Basic structure as structure 52 Bolt member 53 Nut member

Claims (7)

[Claims] 1. A reinforcing structure comprising: a bolt member engaged with a structure at one end thereof; and a nut member screwed to the other end of the bolt member and engaged with the structure. A reinforcing structure comprising a nut fixing device for urging the nut member against the bolt member in a tightening direction. 2. The reinforcing structure according to claim 1, wherein the nut fixing device urges an outer peripheral side of the nut member. 3. The reinforcing structure according to claim 1, wherein the nut fixing device has an elastic member, and the nut fixing device is urged by pulling the nut member in a tightening direction by the elastic member. Reinforcement structure. 4. The reinforcing structure according to claim 3, wherein the elastic member is a coil spring, one end of which is supported by the bolt member, and the other end of which is connected to the nut member. Reinforcement structure characterized by. 5. The reinforcing structure according to claim 3, wherein the elastic member is a spiral spring, one end of which is supported by the structure, and the other end of which is connected to the nut member. Reinforcement structure characterized by. 6. The reinforcing structure according to claim 5, wherein an anchor plate is interposed between the nut member and the structure, and the elastic member is supported by the structure via the anchor plate. A reinforcement structure characterized by being made. 7. A nut fixing device for fixing a nut member, which is screwed to the other end of a bolt member engaged with one end of the structure to the other end of the bolt and engaged with the structure, to the structure. Wherein the nut member is urged in a tightening direction with respect to the bolt member.