Reinforcing device for bridge cracks and using method

文档序号:3971 发布日期:2021-09-17 浏览:44次 中文

1. A reinforcing apparatus for a bridge fracture, comprising:

the crack main body extends into the first empty groove;

the sliding plates are arranged on two sides of the upper end in the first hollow groove, the outer side of the lower end of each sliding plate is fixedly connected with a first rotating piece, the first rotating pieces are arranged at equal intervals, the first rotating pieces are rotatably connected with connecting rotating rods, the other ends of the connecting rotating rods are rotatably connected with second rotating pieces, and the other sides of the second rotating pieces are fixedly connected with horizontal sliding rods;

the longitudinal fixing plate is arranged on the outer side of the horizontal sliding rods, the horizontal sliding rods are in sliding connection with the longitudinal fixing plate, and the number of the first rotating piece, the connecting rotating rod, the second rotating piece and the horizontal sliding rods corresponds to that of the horizontal sliding rods;

the side connecting plate is arranged at the rear end of the inner side of the sliding plate on one side and the front end of the inner side of the sliding plate on the other side, and a first connecting tooth part is arranged on the inner side surface of the side connecting plate;

the middle gear is arranged between the two sliding plates, is meshed with the first connecting tooth part on the side connecting plate, and is fixedly connected with a middle connecting shaft at the lower end through a key groove;

the driving gear is arranged at the lower end of the middle connecting shaft and is fixed with the middle connecting shaft through a key groove;

the L-shaped sliding blocks are arranged at the front end and the rear end of the driving gear, and the inner side surfaces of the L-shaped sliding blocks are provided with second connecting tooth parts which are meshed with the driving gear;

and the gap pulling plate is arranged on the outer side of the lower end of the L-shaped sliding block and is fixedly connected with the L-shaped sliding block.

2. The bridge crack strengthener of claim 1 wherein a third rotatable member is rotatably connected to a side of the horizontal sliding bar remote from the second rotatable member, and a rotatable plate is fixedly connected to the other side of the third rotatable member, and the horizontal sliding bar rotatable plates are rotatably connected by the third rotatable member.

3. A reinforcing apparatus for a bridge fracture as claimed in claim 2, wherein the outer sides of the horizontal sliding bar and the third rotating member are provided with compression springs along the longitudinal fixed plate and the rotating plate, and both ends of the compression springs are fixed to the longitudinal fixed plate and the rotating plate, respectively.

4. The reinforcing apparatus for a bridge crack of claim 1, wherein a horizontal fixing plate is fixedly connected to the upper end of the longitudinal fixing plate, a sliding connection block is fixedly connected to the upper end of the horizontal fixing plate, a second sliding groove is formed at a position where the lower end surface of the sliding plate is connected to the sliding connection block, the sliding connection block slides along the second sliding groove in a limited manner, second fixing nails are fixedly connected to the lower end of the horizontal fixing plate along two sides of the longitudinal fixing plate, and the second fixing nails extend into the bridge body.

5. The bridge crack reinforcing apparatus as claimed in claim 1, wherein the two sliding plates are a set, a plurality of sets of sliding plates are provided, a shielding plate is provided at an upper end of each set of sliding plates, a first sliding groove is provided at a position where the shielding plate is connected to the sliding plate, and a limiting sliding part is integrally connected to the middle of the upper end of the sliding plate and slides along the first sliding groove in a limiting manner.

6. A reinforcing apparatus for a bridge fracture as claimed in claim 1, wherein the inner side of said side connecting plate is fixedly provided with a first protruding stopper portion along the outer portion of the first connecting tooth portion, and the inner side of said L-shaped sliding block is fixedly provided with a second protruding stopper portion along the outer portion of the second connecting tooth portion.

7. A reinforcing apparatus for a bridge fracture as claimed in claim 5, wherein the fracture body is provided at an upper end thereof with a fixing box, the driving gear and the L-shaped sliding block are both located inside the fixing box, the L-shaped sliding block slides along an inner wall of the fixing box, and the gap pulling plate passes through the fixing box and is fixed to the L-shaped sliding block.

8. A reinforcing apparatus for a bridge fracture as claimed in claim 7, wherein the lower end of the shielding plate is arrayed with first fixing nails from front to rear on both sides thereof, and the lower end of the stationary box body is fixedly connected with third fixing nails along the outer sides of the slot-pulling plate, both the first fixing nails and the third fixing nails extending to the inside of the bridge main body.

9. A using method is realized on the basis of the reinforcing device for the bridge crack in any one of claims 1-8, wherein the method comprises the following steps:

the method comprises the following steps: opening a first empty groove and a second empty groove on the bridge main body along the upper end of the crack main body, cleaning the interior of the crack main body, pouring concrete to fill the crack main body, and then installing the reinforcing device;

step two: the rotating plate is extruded after the crack main body has a widening trend, and due to the existence of the third rotating piece, the third rotating piece is extruded in multiple directions, so that the horizontal sliding rod at the corresponding position can slide outwards, the pressure spring is extruded, and the pressure spring has a reaction force on the crack main body;

step three: the horizontal sliding rod slides outwards along the longitudinal fixed plate, pushes the connecting rotating rod to contract inwards, and drives the sliding plate to slide inwards;

step four: the first connecting tooth parts on the side connecting plates are synchronously inward, the intermediate gear rotates under the meshing action, and the intermediate connecting shaft synchronously rotates;

step five: the middle connecting shaft drives the driving gear in the fixed box body to rotate, under the meshing action of the driving gear and the second connecting tooth part, the two L-shaped sliding blocks simultaneously slide to the middle position, and the gap pulling plate synchronously slides to the middle position;

step six: the crack pulling plate presses the upper end of the crack main body to resist the acting force of outward deformation.

Background

A bridge (bridge) refers to a building constructed for a road to cross a natural or artificial obstacle, and is erected on rivers, lakes and seas to enable vehicles, pedestrians and the like to smoothly pass through. The bridge generally consists of an upper structure, a lower structure and an auxiliary structure, wherein the upper structure mainly refers to a bridge span structure and a support system; the lower structure comprises a bridge abutment, a bridge pier and a foundation; the auxiliary structures refer to bridge end butt straps, tapered revetments, diversion works and the like. The bridge is divided according to a structural system and comprises four basic systems, namely a beam bridge, an arch bridge, a rigid bridge and a suspension cable bearing (a suspension bridge and a cable-stayed bridge).

The bridge bears the important responsibility of the traffic tool passing, long-time transportation, high-temperature weather, low-temperature weather, rainwater weather and the like can damage the bridge, cracks can appear on the end face of the bridge, the bridge needs to be repaired and reinforced in time, otherwise the cracks are larger and larger under the action of load and environment, the bearing capacity of the whole bridge body is affected, and potential safety hazards are caused.

The existing repairing and reinforcing method is to clean the crack, and clean the concrete or asphalt structure around the position, the embedded steel bar is connected with the original steel bar to generate a tensile force, and then concrete or asphalt is poured again, thereby achieving the effect of repairing and reinforcing, but the crack is easier to be generated again than the normal position after the position of the original crack is repaired, and the repairing method can only play a role of timely repairing, namely the position can reach the bearing standard after being repaired, once the position is stressed again to enable the crack to be generated again or further enlarged, no automatic counter-measures for the crack are provided, and the crack position can not be reinforced for a long time.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.

The invention also aims to provide a reinforcing device for a bridge crack and a using method thereof, which realize the effect of reinforcing the crack position for a long time, thereby effectively avoiding the problem that the secondary repair is more difficult when the original crack position is generated again or is further enlarged.

In order to achieve the above objects and other objects, the present invention adopts the following technical solutions:

a reinforcing apparatus for a bridge fracture, comprising:

the crack main body extends into the first empty groove;

the sliding plates are arranged on two sides of the upper end in the first hollow groove, the outer side of the lower end of each sliding plate is fixedly connected with a first rotating piece, the first rotating pieces are arranged at equal intervals, the first rotating pieces are rotatably connected with connecting rotating rods, the other ends of the connecting rotating rods are rotatably connected with second rotating pieces, and the other sides of the second rotating pieces are fixedly connected with horizontal sliding rods;

the longitudinal fixing plate is arranged on the outer side of the horizontal sliding rods, the horizontal sliding rods are in sliding connection with the longitudinal fixing plate, and the number of the first rotating piece, the connecting rotating rod, the second rotating piece and the horizontal sliding rods corresponds to that of the horizontal sliding rods;

the side connecting plate is arranged at the rear end of the inner side of the sliding plate on one side and the front end of the inner side of the sliding plate on the other side, and a first connecting tooth part is arranged on the inner side surface of the side connecting plate;

the middle gear is arranged between the two sliding plates, is meshed with the first connecting tooth part on the side connecting plate, and is fixedly connected with a middle connecting shaft at the lower end through a key groove;

the driving gear is arranged at the lower end of the middle connecting shaft and is fixed with the middle connecting shaft through a key groove;

the L-shaped sliding blocks are arranged at the front end and the rear end of the driving gear, and the inner side surfaces of the L-shaped sliding blocks are provided with second connecting tooth parts which are meshed with the driving gear;

and the gap pulling plate is arranged on the outer side of the lower end of the L-shaped sliding block and is fixedly connected with the L-shaped sliding block.

Preferably, one side of the horizontal sliding rod, which is far away from the second rotating part, is rotatably connected with a third rotating part, the other side of the third rotating part is fixedly connected with a rotating plate, and the horizontal sliding rod is rotatably connected with the rotating plate through the third rotating part.

Preferably, a pressure spring is disposed between the longitudinal fixed plate and the rotating plate at the outer side of the horizontal sliding rod and the third rotating member, and both ends of the pressure spring are respectively fixed to the longitudinal fixed plate and the rotating plate.

Preferably, the upper end of the longitudinal fixing plate is fixedly connected with a horizontal fixing plate, the upper end of the horizontal fixing plate is fixedly connected with a sliding connecting block, a second sliding groove is formed in the connecting position of the lower end face of the sliding plate and the sliding connecting block, the sliding connecting block slides along the second sliding groove in a limiting mode, second fixing nails are fixedly connected to the lower end of the horizontal fixing plate along two sides of the longitudinal fixing plate, and the second fixing nails extend into the bridge main body.

Preferably, the two sliding plates are in a group, the sliding plates are provided with a plurality of groups, the upper ends of the sliding plates are provided with shielding panels, the connecting positions of the shielding panels and the sliding plates are provided with first sliding grooves, the middle of the upper ends of the sliding plates are integrally connected with limiting sliding parts, and the limiting sliding parts slide along the first sliding grooves in a limiting manner.

Preferably, a first protruding limiting portion is fixedly arranged on the inner side of the side connecting plate along the outer portion of the first connecting tooth portion, and a second protruding limiting portion is fixedly arranged on the inner side of the L-shaped sliding block along the outer portion of the second connecting tooth portion.

Preferably, the upper end of crack main part is provided with fixed box, and drive gear and L shape sliding block all are located the inside of fixed box, and L shape sliding block slides along fixed box inner wall, and the gap pulling plate passes fixed box and is fixed with L shape sliding block.

Preferably, the two sides of the lower end of the shielding panel are arrayed with first fixing nails from front to back, the two sides of the lower end of the fixed box body are fixedly connected with third fixing nails along the outer sides of the gap pulling plates, and the first fixing nails and the third fixing nails extend into the bridge main body.

A method of use comprising the steps of:

the method comprises the following steps: opening a first empty groove and a second empty groove on the bridge main body along the upper end of the crack main body, cleaning the interior of the crack main body, pouring concrete to fill the crack main body, and then installing the reinforcing device;

step two: the rotating plate is extruded after the crack main body has a widening trend, and due to the existence of the third rotating piece, the third rotating piece is extruded in multiple directions, so that the horizontal sliding rod at the corresponding position can slide outwards, the pressure spring is extruded, and the pressure spring has a reaction force on the crack main body;

step three: the horizontal sliding rod slides outwards along the longitudinal fixed plate, pushes the connecting rotating rod to contract inwards, and drives the sliding plate to slide inwards;

step four: the first connecting tooth parts on the side connecting plates are synchronously inward, the intermediate gear rotates under the meshing action, and the intermediate connecting shaft synchronously rotates;

step five: the middle connecting shaft drives the driving gear in the fixed box body to rotate, under the meshing action of the driving gear and the second connecting tooth part, the two L-shaped sliding blocks simultaneously slide to the middle position, and the gap pulling plate synchronously slides to the middle position;

step six: the crack pulling plate presses the upper end of the crack main body to resist the acting force of outward deformation.

The invention at least comprises the following beneficial effects:

1. in the invention, the rotating plate is extruded after the crack main body has a widening trend, because of the existence of the third rotating piece, the third rotating piece is extruded in multiple directions, the horizontal sliding rod at the corresponding position can slide outwards, the pressure spring is extruded, the pressure spring has reaction force to the crack main body, the horizontal sliding rod slides outwards along the longitudinal fixed plate, the connecting rotating rod is pushed to contract inwards to drive the sliding plate to slide inwards, the first connecting tooth parts on the side connecting plates synchronously inwards, the middle gear rotates under the meshing action, the middle connecting shaft synchronously rotates, the middle connecting shaft drives the driving gear in the fixed box to rotate, under the meshing action of the driving gear and the second connecting tooth part, the two L-shaped sliding blocks simultaneously slide to the middle position, the gap pulling plate synchronously slides to the middle position, and the gap pulling plate extrudes the upper end of the crack main body to resist the acting force of outward deformation. The driving force of whole process derives from the outside effort that warp of crack, consequently does not need drive arrangement to participate in, and can reach permanent driven effect, as long as the crack has outside effort, and each structure has the linkage effect on whole reinforcement dress to make the crack pull plate slide to the intermediate position, have the pulling force to the crack maximum position department of toper crack, slow down the trend that the crack enlarges. The effect of reinforcing the crack position for a long time is achieved, and therefore the problem that secondary repair is more difficult when the original crack position is produced again or is further enlarged is effectively solved.

2. In the invention, the rotating plate is extruded after the crack main body has a tendency of widening, and because the third rotating piece exists, the forces in different directions extrude the third rotating piece to enable the horizontal sliding rod at the corresponding position to slide outwards, so that other structures resist deformation; the pressure spring is extruded, and the pressure spring has reaction force to the crack main part, because pressure spring is to the crack reaction, resists the outside effort that warp of crack to play the effect of long-term resistance.

3. According to the invention, the shielding panel is arranged at the uppermost end of the whole reinforcing device, and plays a role in shielding and covering the crack main body and the reinforcing device, so that the phenomenon that the normal passing of a vehicle is influenced due to the protruding structure on the device is avoided; the limiting sliding of the sliding plate is ensured, so that the sliding plate can accurately slide to the crack position; the outward deformation amplitude of the repaired crack position is reduced by the inward acting force of the multi-position structures on the two sides of the long-strip crack main body.

Drawings

FIG. 1 is a side cross-sectional view of a reinforcing apparatus for a bridge fracture according to the present invention, and a fracture connection position on a bridge main body;

FIG. 2 is an enlarged view of the structure at the position A of the reinforcing device for the bridge cracks, provided by the invention;

FIG. 3 is a schematic structural view illustrating a connection relationship between a blocking panel and a sliding plate of the reinforcing apparatus for a crack in a bridge according to the present invention;

FIG. 4 is a schematic structural diagram of the connection relationship between two adjacent sliding plates and an intermediate gear of the reinforcing device for bridge cracks provided by the invention;

fig. 5 is a schematic top sectional structural view of the internal structure of the fixed box body of the reinforcing device for a bridge crack provided by the invention.

Detailed Description

The present invention is described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description.

As shown in fig. 1 to 5, a reinforcing apparatus for a crack of a bridge, includes: the crack main body 31 comprises a bridge main body 30, a first empty groove 32 and a second empty groove 33 which are arranged on the upper end face of the bridge main body 30, and a crack main body 31 in the bridge main body 30, wherein the crack main body 31 extends into the first empty groove 32; the sliding plate 3 is arranged on two sides of the upper end in the first hollow groove 32, a first rotating member 6 is fixedly connected to the outer side of the lower end of the sliding plate 3, the first rotating members 6 are arranged at equal intervals, a connecting rotating rod 7 is rotatably connected to the first rotating member 6, a second rotating member 8 is rotatably connected to the other end of the connecting rotating rod 7, and a horizontal sliding rod 9 is fixedly connected to the other side of the second rotating member 8; the longitudinal fixing plate 10 is arranged on the outer side of the horizontal sliding rods 9, the horizontal sliding rods 9 are all connected with the longitudinal fixing plate 10 in a sliding mode, and the number of the first rotating pieces 6, the connecting rotating rods 7, the second rotating pieces 8 and the horizontal sliding rods 9 corresponds to that of the horizontal sliding rods 9; a side connecting plate 4 provided at a rear end of an inner side of the slide plate 3 on one side and a front end of an inner side of the slide plate 3 on the other side, an inner side surface of the side connecting plate 4 being provided with a first connecting tooth portion 24; an intermediate gear 5 which is arranged between the two sliding plates 3, wherein the intermediate gear 5 is meshed with a first connecting tooth part 24 on the side connecting plate 4, and the lower end of the intermediate gear 5 is fixedly connected with an intermediate connecting shaft 17 through a key groove; a drive gear 26 provided at a lower end of the intermediate connecting shaft 17 and fixed to the intermediate connecting shaft 17 by a key groove; l-shaped sliding blocks 27 provided at both front and rear ends of the drive gear 26, wherein second connecting tooth portions 28 are provided on inner side surfaces of the L-shaped sliding blocks 27, and the second connecting tooth portions 28 mesh with the drive gear 26; and a slit pulling plate 16 which is arranged outside the lower end of the L-shaped sliding block 27 and is fixedly connected with the L-shaped sliding block 27.

In the above scheme, the crack main body extrudes the rotating plate after having a widening trend, the horizontal sliding rod outwards slides along the longitudinal fixing plate, the pushing connection rotating rod inwards contracts to drive the sliding plate to inwards slide, the first connecting tooth part on the side connecting plate is inwards synchronous, the intermediate gear rotates under the meshing action, the intermediate connecting shaft synchronously rotates, the intermediate connecting shaft drives the driving gear to rotate, under the meshing action of the driving gear and the second connecting tooth part, the two L-shaped sliding blocks simultaneously slide towards the intermediate position, the gap pulling plate synchronously slides towards the intermediate position, the gap pulling plate extrudes the upper end of the crack main body to resist the acting force deforming outwards.

In a preferable scheme, a third rotating member 19 is rotatably connected to one side of the horizontal sliding rod 9 away from the second rotating member 8, a rotating plate 20 is fixedly connected to the other side of the third rotating member 19, and the horizontal sliding rod 9 and the rotating plate 20 are rotatably connected through the third rotating member 19.

In the above scheme, the rotating plate can be extruded after the crack main body has the tendency of widening, and because of the existence of the third rotation piece, the force extrusion third rotation piece of equidirectional all can make the horizontal sliding rod that corresponds the position slide to the outside to make other structures resist the deformation.

In a preferred scheme, a pressure spring 18 is arranged between the longitudinal fixed plate 10 and the rotating plate 20 at the outer side of the horizontal sliding rod 9 and the third rotating member 19, and two ends of the pressure spring 18 are respectively fixed with the longitudinal fixed plate 10 and the rotating plate 20.

In the above scheme, pressure spring is extruded, and pressure spring has reaction force to the crack main part, because pressure spring is to the crack reaction, resists the outside effort that warp of crack to play the effect of resisting for a long time, guarantee that the crack main part slows down from the trend of expanding down.

In a preferable scheme, a horizontal fixing plate 12 is fixedly connected to the upper end of the longitudinal fixing plate 10, a sliding connection block 11 is fixedly connected to the upper end of the horizontal fixing plate 12, a second sliding groove 23 is formed at a connection position of the lower end surface of the sliding plate 3 and the sliding connection block 11, the sliding connection block 11 slides along the second sliding groove 23 in a limiting manner, second fixing nails 13 are fixedly connected to the lower end of the horizontal fixing plate 12 along two sides of the longitudinal fixing plate 10, and the second fixing nails 13 extend into the bridge main body 30.

Among the above scheme, the level is to the both sides fixedly connected with second staple of fixed plate lower extreme along longitudinal fixed plate, and the second staple extends to the inside of bridge main part and guarantees that the level is unchangeable to the fixed plate position, and the horizontal sliding rod outwards slides along longitudinal fixed plate, promotes to connect the dwang and inwards contracts, drives the sliding plate and inwards slides, more can stably guarantee the spacing slip of sliding plate under the unchangeable condition of level to the fixed plate position.

In a preferable scheme, two sliding plates 3 are a group, the sliding plates 3 are provided with a plurality of groups, the upper ends of the groups of sliding plates 3 are provided with a shielding panel 1, the connecting position of the shielding panel 1 and the sliding plates 3 is provided with a first sliding groove 21, the middle of the upper end of the sliding plate 3 is integrally connected with a limiting sliding part 22, and the limiting sliding part 22 slides along the first sliding groove 21 in a limiting manner.

In the scheme, the shielding panel is arranged at the uppermost end of the whole reinforcing device, and plays a role in shielding and covering the crack main body and the reinforcing device, so that the phenomenon that the normal passing of vehicles is influenced due to the fact that the upper structure of the device is protruded is avoided; the limiting sliding of the sliding plate is ensured, so that the sliding plate can accurately slide to the crack position; the outward deformation amplitude of the repaired crack position is reduced by the inward acting force of the multi-position structures on the two sides of the long-strip crack main body.

In a preferred embodiment, a first protruding limiting portion 25 is fixedly disposed on the inner side of the side connecting plate 4 along the outer portion of the first connecting tooth portion 24, and a second protruding limiting portion 29 is fixedly disposed on the inner side of the L-shaped sliding block 27 along the outer portion of the second connecting tooth portion 28.

In the above scheme, the spacing portion of first protrusion and the spacing portion of second protrusion all play limiting displacement, avoid side connecting plate and L shape sliding block to remove excessively.

In a preferred embodiment, the upper end of the crack main body 31 is provided with the fixed box 14, the driving gear 26 and the L-shaped sliding block 27 are both located inside the fixed box 14, the L-shaped sliding block 27 slides along the inner wall of the fixed box 14, and the crack pulling plate 16 passes through the fixed box 14 and is fixed with the L-shaped sliding block 27.

In the above scheme, the fixed box only plays the effect of accomodating outward, and its rigidity is motionless, avoids the meshing connected mode of external environment influence drive gear and L shape sliding block.

In a preferable scheme, the first fixing nails 2 are arrayed from the front to the back on two sides of the lower end of the shielding panel 1, the third fixing nails 15 are fixedly connected to two sides of the lower end of the fixed box body 14 along the outer side of the gap pulling plate 16, and the first fixing nails 2 and the third fixing nails 15 both extend into the bridge main body 30.

In the above scheme, first staple and third staple play the fixed effect of support, guarantee that the upper end structure is fixed motionless, do not influence the action of other structures.

A method of use comprising the steps of:

the method comprises the following steps: a first empty groove 32 and a second empty groove 33 are formed in the bridge main body 30 along the upper end of the crack main body 31, the interior of the crack main body 31 is cleaned, concrete is poured to fill the crack main body 31, and then the reinforcing device is installed;

step two: the rotating plate 20 is pressed after the crack main body 31 has a widening tendency, and due to the existence of the third rotating piece 19, the third rotating piece 19 is pressed in multiple directions, so that the horizontal sliding rod 9 at the corresponding position slides outwards, the pressure spring 18 is pressed, and the pressure spring 18 has a reaction force on the crack main body 31;

step three: the horizontal sliding rod 9 slides outwards along the longitudinal fixed plate 10, pushes the connecting rotating rod 7 to contract inwards, and drives the sliding plate 3 to slide inwards;

step four: the first connecting tooth part 24 on the side connecting plate 4 is synchronously inward, the intermediate gear 5 rotates under the meshing action, and the intermediate connecting shaft 17 synchronously rotates;

step five: the middle connecting shaft 17 drives the driving gear 26 in the fixed box 14 to rotate, under the meshing action of the driving gear 26 and the second connecting tooth part 28, the two L-shaped sliding blocks 27 simultaneously slide to the middle position, and the gap pulling plate 16 synchronously slides to the middle position;

step six: the crack pulling plate 16 presses the upper end of the crack body 31 against the outward deformation force.

In the above scheme, the driving force of the whole process is derived from the acting force of the outward deformation of the crack, so that the driving device is not needed to participate, the long-term driving effect can be achieved, as long as the crack has the outward acting force, the whole reinforcement device is provided with each structure to achieve the linkage effect, therefore, the crack pulling plate slides to the middle position, the maximum crack position of the conical crack is provided with the pulling force, and the crack expansion tendency is slowed down. The effect of reinforcing the crack position for a long time is achieved, and therefore the problem that secondary repair is more difficult when the original crack position is produced again or is further enlarged is effectively solved.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

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