JP2009235782A - Fender and reinforcing method of fender - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fender, capable of easily enhancing the performance of an existing fender. <P>SOLUTION: The fender 1 comprises an impact receiving panel 2 on which external force P acts, a body rubber part 3 expanded and contracted by the displacement of the panel 2, and a hollow part 31 formed by the panel 2, the body rubber part 3, and a base plate 4 opposed to the panel. This fender further comprises an airtight elastic bag part 6 having an end portion fixed to the base plate 4 within the hollow part 31, and a pressure regulation means 7 which regulates the internal pressure of the bag part 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fender provided on a wall such as a quay or caisson for mooring a ship, and a method for reinforcing the fender.

  Conventionally, it is known to attach a fender to a quay or the like in order to mitigate an impact when a ship is in contact (see Patent Documents 1 and 2).

  In the fenders disclosed in Patent Documents 1 and 2, the cylindrical outer shell portion is formed of an elastic body such as rubber, and the front surface of the outer shell portion is blocked by an impact plate that contacts the ship. The air enclosed in the hollow portion inside the outer shell portion and the rubber outer shell portion serve as a cushioning material, and relieve the impact acting on the quay from the ship.

In addition, an allowable external force that can be applied to such a fender is determined by design.
JP 2000-64253 A JP-A-11-152728

  However, the performance of the existing fenders (allowable reaction force, absorbed energy) when the assumed external force increases or the existing fenders deteriorate due to changes in the use conditions of the mooring equipment, etc. ) May be insufficient. In such a case, it is necessary to replace the existing fender with a large fender having high performance or to add a fender.

  On the other hand, the shape and structure of the mounting surface of the quay to which the fender is attached are often formed in accordance with the shape and the mounting interval of the existing fender, and even when it is replaced with a large fender, it is newly protected. In the case of adding a brazing material, it is often necessary to rebuild the mounting surface again.

  Therefore, an object of the present invention is to provide a fender that can easily increase the performance of an existing fender and a method for reinforcing the fender.

  In order to achieve the above object, the fender according to the present invention includes an impact receiving portion to which an external force acts and an outer shell portion that expands and contracts by displacement of the impact receiving portion, and the impact receiving portion and the outer shell portion. A fender having a hollow portion formed by an immovable portion facing the impact receiving portion, an airtight elastic bag portion having an end fixed to the immovable portion inside the hollow portion, and its airtight elasticity And pressure adjusting means for adjusting the internal pressure of the bag portion.

  Here, the pressure adjusting means may be constituted by an air supply / exhaust pipe communicated with the inside of the airtight elastic bag portion and guided to the outside, and a valve provided in the air supply / exhaust pipe. The pressure adjusting means may include an air compression device.

  Moreover, the reinforcement part made to contact | abut to the said airtight elastic bag part can be provided in the said hollow part side of the said receiving part.

  Furthermore, the airtight elastic bag portion may be configured to include a rubber bag portion. Moreover, the said airtight elastic bag part may be provided with the cyclic | annular reinforcement material in the circumferential direction.

  The fender reinforcing method of the present invention includes an impact receiving portion to which an external force acts and an outer shell portion that expands and contracts by displacement of the impact receiving portion, and is hollow by the impact receiving portion and the outer shell portion. A method of reinforcing a fender having a portion formed therein, an opening step for communicating the hollow portion and the outside, and fixing an end portion of the airtight elastic bag portion to a stationary portion, and an internal pressure of the airtight elastic bag portion An arrangement step of installing pressure adjusting means for adjusting the pressure, and a restoration step of closing the opening communicating with the outside to make it usable.

  The fender of the present invention configured as described above has a performance (allowable) of the fender by providing an airtight elastic bag portion inside the hollow portion formed by the impact receiving portion, the outer shell portion, and the immobile portion. Reaction force, absorbed energy).

  Therefore, the performance of the fender can be easily increased without constructing a new mounting surface.

  Further, by adjusting the internal pressure of the airtight elastic bag portion with the pressure adjusting means, the performance such as the allowable reaction force of the fender can be easily adjusted to a desired value.

  For example, the pressure adjustment means is composed of an air supply / exhaust pipe that communicates with the inside of the airtight elastic bag portion and is guided to the outside, and a valve provided in the air supply / exhaust pipe, thereby controlling the air supply / exhaust speed depending on the degree of opening of the valve As a result, the reaction force of the fender can be adjusted. Furthermore, the amount of absorbed energy can be increased with a behavior close to a constant reaction force type in which the reaction force is substantially constant regardless of the deformation amount of the fender, depending on the degree of opening and closing of the valve.

  Further, by providing an air compression device as the pressure adjusting means, it is possible to increase the internal pressure of the airtight elastic bag portion and improve the performance of the fender such as an allowable reaction force. In addition, by providing an air compression device, the performance of the fender can be easily recovered even if the internal pressure decreases with time, and adjustments such as temporarily increasing the allowable reaction force are also facilitated. .

  In addition, when the impacting part and the airtight elastic bag part collide with each other and there is a risk of damage to the impacting part, the reinforcement part can be easily reinforced by providing it on the hollow part side of the impacting part. can do.

  Further, if the airtight elastic bag portion is formed of a rubber bag portion, the fender can be reinforced with a simple configuration.

  Furthermore, if the airtight elastic bag portion is reinforced by the circumferential annular reinforcing material, it is possible to prevent the airtight elastic bag portion that has received an external force from expanding in the circumferential direction and preventing an excessive load from acting on the inside of the outer shell portion. it can.

  In addition, the method for reinforcing a fender according to the present invention is a method in which an airtight elastic bag portion is disposed in a hollow portion of an existing fender, so that the fender can be enlarged or a new fender can be provided at another position. Even if the material is not attached, the performance (allowable reaction force, absorbed energy) of the fender can be increased.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing a partially broken configuration of the fender 1 according to the present embodiment. FIG. 2 is a cross-sectional view illustrating the configuration of the fender 1.

  First, the structure of the fender 1 will be described. The fender 1 is attached to the quay 5, and includes a receiving panel 2 as a receiving portion to which an external force P acts, and the receiving panel 2. The main body rubber portion 3 as an outer shell portion that expands and contracts by displacement, the base plate 4 as an immovable portion to which the end of the main body rubber portion 3 is attached, the airtight elastic bag portion 6 disposed inside the main body rubber portion 3, and its airtightness It is mainly comprised by the pressure adjustment means 7 which adjusts the internal pressure of the elastic bag part 6. FIG.

  The impact panel 2 is formed of a substantially square steel plate and a steel frame material in plan view, and prevents damage at the time of collision on the working surface side of the external force P with which a ship or the like comes into contact as necessary. For example, a resin plate or a protective pad is attached.

  The main rubber part 3 is a cylindrical outer shell in which a cylindrical hollow part 31 is formed. When the external force P acts on the impact receiving panel 2 and is displaced toward the quay 5 side, the main rubber part 3 contracts in the axial direction, and the external force It is formed of an elastic material that expands when P is relaxed and the impact panel 2 is displaced toward the original position. For example, the main rubber part 3 is formed of rubber, laminated rubber, tire cord, or the like.

  Further, as shown in FIG. 2, the end portion on the receiving panel 2 side and the end portion on the base plate 4 side of the main rubber portion 3 are widened in a bowl shape to form flanges 32 and 33.

  The base plate 4 is a circular plate formed in accordance with the shape of the flange 33 of the main rubber part 3 and is fixed to the wall surface of the quay wall 5 with bolts (not shown).

  That is, by attaching the receiving panel 2 to one flange 32 of the main rubber part 3 and attaching the base plate 4 to the other flange 33, a hollow part 31 that is shut off from the outside and sealed with air is formed. .

  And in this hollow part 31, the airtight elastic bag part 6 is arrange | positioned. The airtight elastic bag portion 6 includes a cylindrical bag portion 61, a disk-shaped shape holding plate 62 attached to the receiving panel 2 side of the bag portion 61, and a spiral shape in the membrane material of the bag portion 61. Or it is mainly comprised by the annular reinforcement 63 arrange | positioned at a ring shape.

  The bag portion 61 is a member formed by molding a highly airtight elastic material such as a rubber material into a bag shape. As shown in FIG. 2, the end surface has a communication hole 71a so that air can be filled into the inner space. Is formed.

  Further, the shape of the bag portion 61 is held in a cylindrical shape by a shape holding plate 62 attached to one end of the bag portion 61. Further, if the shape holding plate 62 is attached, the contact surface with the impact receiving panel 2 can be protected.

  Further, as shown in FIG. 2, a plurality of annular reinforcing members 63,... Are built in the film member constituting the bag portion 61 at intervals in the axial direction of the bag portion 62. The annular reinforcing member 63 is formed of a steel wire or the like in a spiral shape or a ring shape, and suppresses deformation in the circumferential direction of the airtight elastic bag portion 6 (in other words, deformation in the direction perpendicular to the axis).

  And the airtight elastic bag part 6 comprised in this way is fixed to the baseplate 4 by the bolt (not shown) or an adhesive agent.

  Further, a reinforcing steel plate 21 having a substantially circular shape in plan view smaller than the diameter of the hollow portion 31 is attached as a reinforcing portion of the receiving panel 2 to the hollow portion 31 side of the receiving panel 2. The reinforcing steel plate 21 is a portion that receives a reaction force from the airtight elastic bag 6 side when the impact panel 2 is displaced and comes into contact with the shape retaining plate 62, and the impact panel 2 is not deformed by the reaction force. It is provided for the purpose of protection.

  On the other hand, a pressure adjusting means 7 is connected to the airtight elastic bag portion 6. The pressure adjusting means 7 is connected to the inside of the airtight elastic bag portion 6 and led to the outside, a supply / exhaust pipe 71, a valve 72 provided in the supply / exhaust pipe 71, and a pressure for measuring the pressure of the supply / exhaust pipe 71. It is mainly composed of 73 in total.

  One end of the air supply / exhaust pipe 71 is connected to the communication hole 71 a of the airtight elastic bag portion 6, and the other end is an open port 71 b that passes through the inside of the base plate 4 and faces the outside.

  Further, a valve 72 for adjusting the amount of gas flowing in the inside of the air supply / exhaust pipe 71 according to the degree of opening and closing is provided on the airtight elastic bag 6 side of the opening 71b. Further, a pressure gauge 73 is connected to the airtight elastic bag 6 side of the valve 72.

  Then, by opening the valve 72 and injecting compressed air from the opening 71 b, the airtight elastic bag portion 6 can be inflated, and the inside can be adjusted to a desired pressure by the pressure gauge 73.

  In addition, even in the airtight elastic bag portion 6 in which the valve 72 is closed so that the air inside does not escape, the reaction force of the fender 1 can be increased.

  Next, a description will be given of a method for reinforcing the existing fenders composed of the impact receiving panel 2 and the main rubber part 3 and attached to the quay 5 to the fenders 1 of the present embodiment.

  First, the receiving panel 2 is removed from the flange 32 of the main rubber part 3, the connection between the quay 5 and the flange 33 is also released, and the main rubber part 3 is removed from the quay 5. By this opening process, the hollow part 31 comes to communicate with the outside. In addition, this opening process may remove the main body rubber | gum part 3 from the quay 5 with the receiving panel 2 attached, for example. A reinforcing steel plate 21 is attached to the approximate center of the receiving panel 2.

  And the edge part of the bag part 61 of the airtight elastic bag part 6 is contact | abutted to the approximate center of the baseplate 4, and it fixes. The base plate 4 is provided with an air supply / exhaust pipe 71, and an end thereof is connected to the communication hole 71a. Further, the other end of the air supply / exhaust pipe 71 protruding from the base plate 4 is extended to the upper surface of the quay wall 5 so that the valve 72 and the pressure gauge 73 can be operated or confirmed from above the quay wall 5.

  Subsequently, the main rubber part 3 is installed so that the airtight elastic bag part 6 attached to the base plate 4 is accommodated in the hollow part 31 of the main rubber part 3, and the flange 33 of the main rubber part 3 is fixed to the base plate 4. .

  Further, the receiving panel 2 is brought into contact with the flange 32 of the main rubber part 3 in a direction in which the reinforcing steel plate 21 is accommodated in the hollow part 31, and the flange 32 and the receiving panel 2 are connected to the flange 32 and the receiving panel 2 at the same place as the beginning. Connect with

  Thus, even if the reaction force of the existing fender becomes insufficient, if the reinforcing method is to arrange the airtight elastic bag portion 6 in the hollow portion 31, the fender can be enlarged or placed in another position. Even if a new fender is not attached, the performance of the fender 1 (at least one of an allowable reaction force and absorbed energy) can be increased.

  Next, the effect | action of the fender 1 of this Embodiment is demonstrated.

  Here, in FIG. 2, the impact panel 2 is in the position of the solid line when the external force P is not applied, the displacement amount is 0, and no reaction force is generated. On the other hand, the receiving panel 2 indicated by a two-dot chain line indicates a displacement limit position where displacement by the external force P is allowed.

  When the impact panel 2 is displaced by the external force P acting, the airtight elastic bag portion 6 disposed in the main body rubber portion 3 and the hollow portion 31 is deformed, so that the reaction force of the fender 1 is applied to the main body rubber portion. 3 is added to the reaction force generated by the deformation of the airtight elastic bag portion 6.

  For example, when the external force P which acts by changing the use conditions of the mooring equipment increases, the reaction force required by the main rubber part 3 alone may not be satisfied. Further, the main rubber part 3 may be softened due to temperature or aging deterioration.

  On the other hand, in the fender 1 of the present embodiment, when the impact receiving panel 2 is displaced by the action of the external force P, the main rubber part 3 contracts to generate a reaction force, and the shape retaining plate 62 is pushed by the reinforcing steel plate 21. Thus, the reaction force of the airtight elastic bag portion 6 is applied.

  That is, the internal pressure of the airtight elastic bag portion 6 may be adjusted so that the total reaction force of both the main rubber portion 3 and the airtight elastic bag portion 6 satisfies the design allowable reaction force.

  The fender 1 of the present embodiment configured as described above is provided with the airtight elastic bag portion 6 inside the hollow portion 31 formed by the receiving panel 2, the main body rubber portion 3 and the base plate 4. Increase performance of fender 1

  For this reason, the performance of the fender 1 can be easily increased without constructing a new mounting surface.

  Further, by adjusting the internal pressure of the airtight elastic bag portion 6 with the pressure adjusting means 7, the performance such as the allowable reaction force of the fender 1 can be easily adjusted to a desired value.

  For example, the degree of opening the valve 72 by configuring the pressure adjusting means 7 by the supply / exhaust pipe 71 communicated with the inside of the airtight elastic bag portion 6 and led to the outside and the valve 72 provided in the supply / exhaust pipe 71. Thus, the supply / exhaust speed can be controlled.

  Here, there is an upper limit on the flow velocity of the air, and since it has a property that it does not flow at a certain flow velocity or more, if the flow cross-section is made sufficiently small by tightening the valve 72, the inside of the airtight elastic bag portion 6 is filled. The amount of the compressed air leaked from the opening 71b is substantially constant regardless of the magnitude of the internal pressure. For this reason, if the opening / closing degree of the valve 72 is adjusted while confirming the internal pressure of the airtight elastic bag portion 6 with the pressure gauge 73, the reaction force of the fender 1 can be adjusted.

  Further, if the air flow is ensured without completely closing the valve 72, the reaction force of the fender 1 is not excessively increased, and the fender 1 is deformed by the amount of air exhausted. be able to.

  In other words, if a fender is used that generates a small reaction force with a small amount of displacement, the reaction force acting on the ship when the energy at the time of initial collision is not damped will increase and damage the ship. There is a fear.

  On the other hand, if the fender 1 is deformed within a range in which air leaks from the opening 71b, the reaction force will not be excessively increased and the ship will not be damaged. Thus, depending on the degree of opening and closing of the valve 72, the absorbed energy amount of the fender 1 can be increased with a behavior close to a constant reaction force type in which the reaction force is substantially constant regardless of the deformation amount of the fender 1.

  The same effect as described above can also be obtained by providing a pressure adjusting valve (not shown) in the air supply / exhaust pipe 71. That is, if a pressure adjusting valve is provided in the middle of the air supply / exhaust pipe 71 and the valve 72 is opened, when the internal pressure of the airtight elastic bag portion 6 rises and reaches a predetermined pressure, the internal air is discharged from the pressure adjusting valve. Since it flows out and the internal pressure does not increase any more, the reaction force of the fender 1 can be limited to an upper limit, and an excessive reaction force does not act on the ship or the quay 5. In the case where a pressure adjusting valve is provided, the valve 72 may not be provided.

  In addition, in the existing fenders composed only of the main rubber part 3, no load is applied from the hollow part 31 side of the impact receiving panel 2, but the fender 1 of the present embodiment is A load from the airtight elastic bag portion 6 acts on the panel 2. Even with such a load, the reinforcing steel plate 21 can be easily reinforced by attaching it to the hollow portion 31 side of the impact receiving panel 2.

  Further, when the airtight elastic bag portion 6 receiving the external force P contracts in the axial direction and the airtight elastic bag portion 6 expands in the circumferential direction (in other words, in the direction perpendicular to the axis) due to the influence, the main rubber portion 3 of the existing fender. An excessive load will act on the inside of the body, and the main rubber part 3 may be damaged by the internal pressure. On the other hand, if the airtight elastic bag portion 6 is reinforced by the circumferential annular reinforcing material 63,... Like the fender 1 of the present embodiment, the circumferential expansion of the bag portion 61 is suppressed. Thus, it is possible to prevent an excessive load from acting on the inner side of the main rubber part 3.

  Hereinafter, in this example, an embodiment different from the above-described embodiment will be described with reference to FIG. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  The fender 1A described in this embodiment is different from the above embodiment in that a compressor 74 as an air compressor is connected to the pressure adjusting means 7.

  That is, in the pressure adjusting means 7 of this embodiment, the air supply / exhaust pipe 71 is branched in the middle, the valve 72 is provided on the side where the end becomes the open port 71b, and the compressor 74 is provided at the end of the other branch pipe. Is connected. A pressure gauge 73 is attached in the vicinity of the compressor 74.

  Further, the airtight elastic bag portion 6 indicated by a solid line in FIG. 3 represents a shape when the compressed air is not sent from the compressor 74 and the internal pressure is atmospheric pressure. On the other hand, the position of the impact panel 2 indicated by a two-dot chain line is an allowable limit position of deformation of the main rubber part 3, and the airtight elastic bag part 6 is molded in accordance with the position of the impact panel 2 of the two-dot chain line. Has been.

  Further, when compressed air is fed from the compressor 74 to inflate the airtight elastic bag portion 6, the airtight elastic bag portion 6 has a size indicated by a two-dot chain line in FIG.

  Thus, when the external force P acts on the impact receiving panel 2 in a state where the compressed air is fed from the compressor 74 and the hermetic elastic bag portion 6 is expanded to the size of the two-dot chain line, the displacement of the main rubber portion 3 is increased. While a reaction force is generated, a reaction force is also generated in the airtight elastic bag portion 6, and the sum of these reaction forces becomes the reaction force of the fender 1A.

  Further, if the compressed air is forcibly sent from the compressor 74 to the airtight elastic bag portion 6 when the fender 1A is deformed, the deformation of the fender 1A is reduced or stopped and the reaction force is increased.

  Since the pressure adjusting means 7 includes the compressor 74 as described above, the internal pressure of the airtight elastic bag portion 6 can be increased, and the performance of the fender 1A such as an allowable reaction force can be improved.

  Further, even if an external force P that is larger than expected is applied, if the internal pressure of the airtight elastic bag portion 6 is increased by sending compressed air from the compressor 74, further displacement of the fender 1A can be suppressed. The impact panel 2 cannot be displaced further, and the main rubber part 3 is not excessively deformed and damaged.

  On the other hand, by adjusting the amount of compressed air fed from the compressor 74, the initial size of the airtight elastic bag portion 6 is adjusted between the size shown by the solid line in FIG. 3 and the size shown by the two-dot chain line. In a state before the external force P is applied, the shape maintaining plate 62 of the airtight elastic bag portion 6 and the reinforcing steel plate 21 of the impact receiving panel 2 are separated from each other.

  In such a state, only the reaction force of the main rubber part 3 is generated as the reaction force of the fender 1A until the impact panel 2 contacts the shape maintaining plate 62.

  And after the external force P becomes large and the reinforcing steel plate 21 of the receiving panel 2 comes into contact with the shape maintaining plate 62, the reaction force of the airtight elastic bag portion 6 is applied as the reaction force of the fender 1A. .

  As described above, the initial reaction force can be generated only by the main rubber part 3 by separating the airtight elastic bag part 6 and the reinforcing steel plate 21 of the receiving panel 2 so as not to contact each other when the external force P is not acting. it can. In other words, if a fender that generates a large reaction force when the displacement is small, the reaction force that acts on the ship when the energy during the initial collision is not damped increases, Risk of damage.

  On the other hand, if the reinforcing steel plate 21 and the airtight elastic bag portion 6 are separated so that only the reaction force of the main rubber portion 3 is generated when the displacement amount of the fender 1A is small, only the main rubber portion 3 can be used. The magnitude of the initial reaction force can be made the same as that of the constructed existing fender.

  Even if the internal pressure decreases or the main rubber part 3 softens with time, the performance of the fender 1A can be easily recovered by sending compressed air from the compressor 74. Furthermore, even when it is desired to temporarily increase the allowable reaction force, the performance of the fender 1A can be easily increased by sending compressed air from the compressor 74.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  The best embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment and example, and the design does not depart from the gist of the present invention. Such modifications are included in the present invention.

  For example, in the above-described embodiment, the airtight elastic bag portion 6 is brought into contact with the reinforcing steel plate 21 of the receiving panel 2 from the initial state. However, the present invention is not limited to this, and the airtight elastic bag portion 6 and the receiving panel are not limited thereto. By separating the two reinforcing steel plates 21 from each other, the initial reaction force can be generated only by the main rubber part 3, and the impact acting on the ship in the initial stage of contact can be made equivalent to that of the existing fender. .

  Moreover, in the said embodiment and the said Example, although the impact panel 2, the main body rubber | gum part 3, and the baseplate 4 were made into a separate member, it is not limited to this, An impact part and an outer shell part, or The outer shell portion and the non-moving portion can be formed as an integral member.

  Furthermore, the shape of the main rubber part 3 is not limited to the above-described embodiment and examples, and may be any shape provided with a hollow part in which the airtight elastic bag part 6 can be arranged.

  Moreover, in the said embodiment and the said Example, although the reinforcement steel plate 21 was attached to the impact panel 2, it is not limited to this, When there is room in the intensity | strength of the impact panel 2, a reinforcement part is provided. It does not have to be.

It is a perspective view explaining the structure of the fender of the best mode of the present invention by partially breaking. It is sectional drawing explaining the structure of the fender of the best embodiment of this invention. It is sectional drawing explaining the structure of the fender of an Example.

Explanation of symbols

P external force 1, 1A fender 2 receiving panel (receiving section)
21 Reinforced steel sheet (reinforced part)
3 Body rubber part (outer shell part)
31 Hollow part 4 Base plate (non-moving part)
6 Airtight elastic bag part 61 Bag part 63 Annular reinforcement 7 Pressure adjusting means 71 Supply / exhaust pipe 72 Valve 73 Pressure gauge 74 Compressor (air compression device)

Claims (7)

A hollow portion is formed by the receiving portion on which an external force acts and an outer shell portion that expands and contracts due to displacement of the receiving portion, and the stationary portion that faces the receiving portion, the outer shell portion, and the receiving portion. A fender to be made,
A fender having an airtight elastic bag portion whose end is fixed to the immovable portion inside the hollow portion, and pressure adjusting means for adjusting an internal pressure of the airtight elastic bag portion.   The said pressure adjustment means is comprised by the inside of the said airtight elastic bag part, and is comprised by the valve | bulb provided in the air supply / exhaust pipe connected to the inside, and the valve | bulb provided in the air supply / exhaust pipe. Fenders.   The fender according to claim 1 or 2, wherein the pressure adjusting means includes an air compression device.   The fender according to any one of claims 1 to 3, wherein a reinforcing portion is provided on the hollow portion side of the impact receiving portion so as to contact the airtight elastic bag portion.   The fender according to any one of claims 1 to 4, wherein the airtight elastic bag portion includes a rubber bag portion.   The fender according to any one of claims 1 to 5, wherein the airtight elastic bag portion includes an annular reinforcing material in a circumferential direction. This is a method for reinforcing a fender having a receiving part on which an external force acts and an outer shell part that expands and contracts by displacement of the receiving part, and a hollow part is formed by the receiving part and the outer shell part. And
An opening step for communicating the hollow portion with the outside;
An arrangement step of fixing the end of the airtight elastic bag part to the stationary part and installing pressure adjusting means for adjusting the internal pressure of the airtight elastic bag part;
A method for reinforcing a fender, comprising: a restoration step of closing an opening communicated with the outside to make it usable.

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