JP2021173134A - Fixing structure and fixing method of resin pad for fender - Google Patents

Abstract

To provide a fixing structure and a fixing method of resin pads for fenders, which can detachably fix a resin pad onto a shock-receiving plate of a fender and can further inhibit chronological loosening of the fixing state.SOLUTION: An inner peripheral surface 6 of a pad-fixing hole 5 that passes through a resin pad 4 is designed to have a diameter-increasing part 6a in which an inner diameter increases at a front position. The resin pad 4 is arranged on a front face 3a of a shock-receiving plate 3 with the pad-fixing hole 5 being positioned at an installation hole 3b of the shock-receiving plate 3. A fixing bolt 7 is inserted through the pad-fixing hole 5 and the installation hole 3b. An annular spring 8 through which the fixing bolt 7 is inserted is made to contact a head 7a of the fixing bolt 7 and the diameter-increasing part 6a bridging said two contact areas, and is fixed onto the shock-receiving plate 3. Said fixing arrangement causes the annular spring 8 to elastically deform so as to cause the annular spring 8 to consistently press the diameter-increasing part 6a against the front face 3a of the shock-receiving plate 3 to secure the resin pad 4 onto the front face 3a of the shock-receiving plate 3.SELECTED DRAWING: Figure 4

Description

The present invention relates to a fixing structure and a fixing method of the resin pad for the fender, and more specifically, the resin pad can be detachably fixed to the aft plate of the fender, further loosening the fixed state with time. It relates to a fixing structure and a fixing method of a resin pad for a fender that can be suppressed.

There are various types of fenders, but fenders having a rear end fixed to a quay or the like and a receiving plate and a resin pad at the front end are known (for example, Patent Documents). 1). Since the ship comes into direct contact with the resin pad, wear and damage increase over time. In order to properly protect the fender, it is necessary to inspect the damaged state of the resin pad in a timely manner, and it is necessary to replace the resin pad whose wear or damage exceeds the permissible limit with a new resin pad.

Conventionally, as illustrated in FIG. 9, the resin pad 9 is detachably fixed to the abutting plate 3 by using a fixing bolt 7 in order to facilitate the replacement work of the resin pad. By inserting the fixing bolt 7 into the counterbore 9a formed in the resin pad 9 and screwing it into the installation hole 3b of the receiving plate 3 with the washer 10 interposed therebetween, the resin pad 9 is placed on the front surface of the receiving plate 3. It is fixed to 3a. However, due to the creep phenomenon of the resin pad 9 pressed by the head portion 7a of the fixing bolt 7 via the washer 10, the fixing state of the resin pad 9 by the fixing bolt 7 is loosened with time. Therefore, the resin pad can be detachably fixed to the receiving plate, and there is room for improvement in suppressing the loosening of the fixed state over time.

Jikkenhei No. 5-30223

An object of the present invention is to provide a fixing structure and a fixing method of a resin pad for a fender material, which can detachably fix the resin pad to a fender receiving plate and further suppress loosening of the fixed state over time. To do.

In order to achieve the above object, the fixing structure of the resin pad for the fender of the present invention includes an abutting plate fixed to the front end of the fetal material, a resin pad arranged in front of the abutment plate, and the resin pad. In the fixing structure of the resin pad for a fetal material having a fixing portion for detachably fixing the resin pad on the front surface of the abutting plate, the fixing portion has a pad mounting hole penetrating the resin pad and the pad. It is provided with an installation hole formed in the receiving plate so as to communicate with the mounting hole, a fixing bolt inserted into the pad mounting hole and the installation hole, and an annular spring portion through which the fixing bolt is inserted. The inner peripheral surface of the pad mounting hole has a diameter-expanded portion having a larger inner diameter at a more forward position, and the annular spring portion comes into contact with the head of the fixing bolt and the diameter-expanded portion to contact the head. The resin is elastically deformed by being bridged between the portion and the enlarged diameter portion, and the annular spring portion constantly presses the expanded diameter portion toward the front surface of the receiving plate due to this elastic deformation. The pad is crimped to the front surface of the receiving plate.

The method for fixing the resin pad for the fender of the present invention is to prevent the resin pad arranged on the front surface of the reception plate fixed to the front end of the fender from being detachably fixed to the front surface of the reception plate. In the method of fixing the resin pad for the fender, the inner peripheral surface of the pad mounting hole penetrating the resin pad is set to have a diameter-expanded portion having a larger inner diameter at a more forward position, and the pad mounting hole is defined as described above. Positioning in the installation hole formed in the abutting plate, the fixing bolt is inserted into the pad mounting hole and the installation hole to fix it to the fender, and the annular spring portion through which the fixing bolt is inserted is inserted. The diameter-expanded portion is brought into contact with the head of the fixing bolt and the diameter-expanded portion, and is stretched between the head and the diameter-expanded portion to be elastically deformed. The resin pad is pressed against the front surface of the abutting plate at all times.

According to the present invention, the resin pad can be detachably fixed to the receiving plate by the pad mounting hole and the fixing bolt inserted into the mounting hole. Then, the annular spring portion is pressed against the head of the fixing bolt whose permanent deformation due to the creep phenomenon is extremely small, and is stretched between the head and the diameter-expanded portion to be elastically deformed. The fixing bolt is fixed to the fender, and by utilizing the elastic deformation of the annular spring portion, the enlarged diameter portion is constantly pressed toward the front surface of the receiving plate by the annular spring portion. Therefore, even if the resin pad (the enlarged diameter portion) is permanently compressed and deformed over time due to the creep phenomenon, the enlarged diameter portion is continuously pressed. As a result, the fixed state of the resin pad crimped to the front surface of the receiving plate can be maintained for a long period of time by suppressing loosening over time.

It is explanatory drawing which illustrates the fender material installed on the quay from the side view. It is explanatory drawing which illustrates the resin pad of FIG. 1 in the front view. It is explanatory drawing which exemplifies the state before the resin pad of FIG. 1 is fixed to a receiving plate by enlarging the inside of a pad mounting hole, and exemplifying in a vertical cross-sectional view. It is explanatory drawing which expands and illustrates the fixed structure of the resin pad of FIG. 1 in the vertical cross-sectional view. It is explanatory drawing which illustrates the inside of the pad mounting hole of FIG. 4 in a plan view. It is explanatory drawing which shows the deformation example of the diameter-expanded part in the vertical cross-sectional view. In another embodiment of the fixing structure of the resin pad, it is explanatory drawing which illustrates the state before the resin pad is fixed to the receiving plate by enlarging the inside of the pad mounting hole and exemplifying in the vertical cross-sectional view. It is explanatory drawing which shows another embodiment of the fixed structure of a resin pad in a vertical cross-sectional view. It is explanatory drawing which shows the conventional example of the fixed structure of a resin pad in a vertical cross-sectional view.

Hereinafter, the fixing structure and fixing method of the resin pad for fender of the present invention will be described based on the embodiment shown in the figure.

Flange portions 2a and 2b are provided at one end and the other end of the fender 1 illustrated in FIGS. 1 and 2, respectively. One flange portion 2a is fixed to the quay 11, and the abutting plate 3 is fixed to the other flange portion 2b. A plate-shaped resin pad 4 is detachably fixed to the front surface 3a of the abutment plate 3 arranged at the front end of the fender 1 in this way.

The flange portions 2a and 2b and the abutting plate 3 are rigid bodies made of metal. The resin pad 4 is made of a hard resin, an elastomer, or the like. Specifically, as the material of the resin pad 4, ultra-high molecular weight polyethylene, high-density polyethylene and the like are used. The resin pad 4 has a lower elastic modulus than the metal flange portions 2a and 2b and the abutting plate 3, and has a large degree of deformation over time (permanent compression deformation) due to the creep phenomenon.

FIG. 3 illustrates a state before fixing the resin pad 4 to the receiving plate 3, and FIGS. 4 and 5 illustrate a fixing structure after fixing the resin pad 4 to the receiving plate 3. The resin pad 4 is detachably fixed to the front surface 3a of the abutting plate 3 by a fixing portion specially devised according to the present invention. This fixing portion includes a pad mounting hole 5, a mounting hole 3b, a fixing bolt 7, and an annular spring portion 8, which will be described later.

The resin pad 4 is formed with a pad mounting hole 5 that penetrates in the thickness direction. The inner peripheral surface 6 of the pad mounting hole 5 has a diameter-expanded portion 6a having a larger inner diameter at a more forward position (a higher position in FIGS. 3 and 4). In this embodiment, the enlarged diameter portion 6a is in the form of a stepped surface on which a spiral surface is formed. In this embodiment, the enlarged diameter portion 6a has a plurality of steps of the stepped surface, but it can also be a one step of the stepped surface.

The abutting plate 3 is formed with an installation hole 3b that penetrates in the thickness direction. The installation hole 3b is a so-called bolt hole. The installation hole 3b and the pad mounting hole 5 are arranged so as to communicate with each other.

An annular spring portion 8 is inserted through a shaft portion 7b of the fixing bolt 7 that fixes the resin pad 4 to the abutment plate 3. The fixing bolt 7 is fixed to the fender 1 (reception plate 3) by being inserted into the pad mounting hole 5 and the installation hole 3b and screwed. The length of the shaft portion 7b of the fixing bolt 7 is appropriately determined.

The annular spring portion 8 has an insertion hole 8a in the central portion in a plan view, has a ring shape (annular shape) in a plan view, and is made of a material rich in elasticity. As the material of the annular spring portion 8, for example, various spring steels specified in JIS G 4801 can be used. In this embodiment, a spiral annular spring portion 8 in which the linear body is processed into a spiral shape is used. The diameter of the annular shape forming the spiral shape gradually increases from one end 8d of the annular spring portion 8 toward the other end (downward in FIG. 3).

As illustrated in FIG. 4, one end 8d of the annular spring portion 8 comes into contact with the head 7a of the fixing bolt 7 and the front surface 3a of the contact plate 3, and is sandwiched between the head 7a and the reception plate 3. ing. That is, the resin pad 4 does not exist between the head portion 7a in which one end portion 8d of the annular spring portion 8 is interposed and the front surface 3a of the contact plate 3. Then, the annular spring portion 8 comes into contact with the head portion 7a and the diameter-expanded portion 6a of the fixing bolt 7 and is stretched between the head portion 7a and the diameter-expanded portion 6a to be elastically deformed.

The procedure of the method of fixing the resin pad 4 to the receiving plate 3 as in the fixing structure illustrated in FIG. 4 is as follows.

First, as illustrated in FIG. 3, the resin pad 4 is arranged on the front surface 3a of the abutment plate 3 fixed to the front end of the fender 1. Then, the pad mounting hole 5 is positioned at a position communicating with the installation hole 3b of the receiving plate 3. The initial annular spring portion 8 is in a neutral state in which it is neither stretched nor compressed. Next, as illustrated in FIG. 4, the fixing bolt 7 is inserted into the pad mounting hole 5 and the installation hole 3b and screwed to fix the fixing bolt 7 through which the annular spring portion 8 is inserted to the receiving plate 3.

By the fixing work of the fixing bolt 7, the head portion of the fixing bolt 7 is passed through the other end portion of the annular spring portion 8 at a position rearward from the other end portion (lower position in FIG. 4). The head 7a and the front surface 3a of the receiving plate 3 are brought into contact with each other so as to be sandwiched between the head 7a and the receiving plate 3. The other end side portion 8e of the annular spring portion 8 with respect to the one end portion 8d is in contact with the diameter-expanded portion 6a, and the annular spring portion 8 is bridged between the head portion 7a and the diameter-expanded portion 6a. And elastically deform.

More specifically, the annular spring portion 8 is compressively and elastically deformed in the axial direction, and the diameter-expanded portion 6a is directed toward the front surface 3a of the contact plate 3 by the other end side portion 8e of the annular spring portion 8 from the one end portion 8d. And always press. As shown by the arrow in FIG. 4, the other end side portion 8e presses the enlarged diameter portion 6a toward the front surface 3a of the abutment plate 3 due to the elastic deformation of the annular spring portion 8. The resin pad 4 is crimped to the front surface 3a of the abutting plate 3 by the pressing force constantly applied by the annular spring portion 8 and is fixed to the abutting plate 3.

In the fixing structure of the resin pad 4 illustrated in FIG. 4, the resin pad 4 can be detachably fixed to the abutment plate 3 by using the fixing bolt 7. Therefore, it is advantageous to quickly replace the resin pad 4.

Further, since one end 8d of the annular spring portion 8 is sandwiched between the head 7a of the fixing bolt 7 and the abutting plate 3 whose permanent deformation due to the creep phenomenon is extremely small as compared with the resin pad 4, this sandwiched state is present. Maintained stable over the long term. That is, the strong integration between the fixing bolt 7 and the receiving plate 3 is maintained for a long period of time.

Then, since the enlarged diameter portion 6a is constantly pressed toward the front surface 3a of the contact plate 3 by utilizing the elastic deformation of the annular spring portion 8, the resin pad 4 (diameter expanded portion 6a) with time due to the creep phenomenon. Even if the diameter is permanently compressed and deformed, the enlarged diameter portion 6a is continuously pressed. As a result, the fixed state of the resin pad 4 crimped to the front surface 3a of the abutting plate 3 can be maintained for a long period of time by suppressing loosening over time.

Since a ship frequently comes into contact with the resin pad 4 to apply an external force, if there is looseness in the fixed state, the looseness is promoted by the external force. Therefore, if the looseness of the fixed state can be suppressed from the beginning of mounting the resin pad 4, it is very effective to suppress the subsequent loosening. Therefore, this fixing structure is very excellent for maintaining the fixed state of the resin pad 4 soundly.

When the looseness of the fixed state of the resin pad 4 over time is suppressed, the interval for performing the inspection work for confirming the looseness can be lengthened. Since this inspection work is a work on water and the number of fixing bolts 7 to be inspected is considerable, the burden of the inspection work can be significantly reduced by applying the present invention.

Further, an axial force (force to pull out in the axial direction) acts on the fixing bolt 7 as a reaction force of the annular spring portion 8 pressing the enlarged diameter portion 6a. This reaction force makes it difficult for the fixing bolt 7 to loosen, which is more advantageous for maintaining the fixed state of the resin pad 4 for a long period of time.

If the pressing force for pressing the resin pad 4 (diameter-expanded portion 6a) by the annular spring portion 8 is too small, the resin pad 4 cannot be stably fixed to the abutting plate 3, and if it is excessive, the resin pad 4 cannot be stably fixed. Unnecessary damage occurs in 4 (diameter enlarged portion 6a). Therefore, a preliminary test or the like is performed to grasp an appropriate range of pressing force that is not excessive or insufficient, and the degree of elastic deformation of the annular spring portion 8 and the annular spring portion 8 (the other end side portion) are adjusted so as to be within the appropriate range. The size of the contact area between 8e) and the enlarged diameter portion 6a is set.

When the spiral-shaped annular spring portion 8 is used as in this embodiment, the degree of elastic deformation can be easily changed only by changing the number of spiral turns, the thickness of the striatum, and the like. Therefore, it becomes easy to adjust the pressing force of the annular spring portion 8 within an appropriate range.

As illustrated in FIG. 6, the diameter-expanded portion 6a has an inclined surface that inclines forward at a predetermined inclination angle with respect to the front surface 3a of the abutting plate 3 to expand the diameter of the pad mounting hole 5 toward the front. It can also be a specification. In this embodiment, the enlarged diameter portion 6a has a single inclined surface, but a plurality of inclined surfaces having different inclination angles may be connected to each other. The inclination angle of the inclined surface of the enlarged diameter portion 6a is preferably about 30 ° to 60 °.

Another embodiment of the fixed structure of the resin pad 4 will be described with reference to FIGS. 7 and 8. FIG. 7 illustrates a state before fixing the resin pad 4 to the receiving plate 3, and FIG. 8 illustrates a fixing structure after fixing the resin pad 4 to the receiving plate 3. In this embodiment, the shapes of the enlarged diameter portion 6a and the annular spring portion 8 of the pad mounting hole 5 are different from those of the previous embodiment, the other configurations are substantially the same, and the procedure of the fixing method is also substantially the same. be.

The enlarged diameter portion 6a is a stepped surface in which a plurality of annular surfaces having different diameters are formed on the inclined surface. In this embodiment, a plurality of annular surfaces are formed, but a one-step stepped surface can be formed.

The annular spring portion 8 has a disk shape having an insertion hole 8a in the central portion. A plurality of disk-shaped annular spring portions 8 are laminated one above the other, and a fixing bolt 7 is inserted therethrough. As illustrated in FIG. 7, the vertical cross-sectional shape of the annular spring portion 8 before the elastic deformation protrudes forward from the cross-sectional shape after the elastic deformation illustrated in FIG. 8 (FIGS. 7 and 8). It has a shape (protruding upward). The disk-shaped annular spring portion 8 may be singular.

In this embodiment, the peripheral edge portion 8b of the insertion hole 8a of the annular spring portion 8 is in contact with the head portion 7a of the fixing bolt 7 and is pressed by the head portion 7a. The outer peripheral side portion 8c of the annular spring portion 8 with respect to the peripheral edge portion 8b is in contact with the diameter-expanded portion 6a, and the annular spring portion 8 is elastically deformed so as to be bridged between the head portion 7a and the diameter-expanded portion 6a. There is. The resin pad 4 does not exist between the head portion 7a in which the peripheral edge portion 8b of the annular spring portion 8 is interposed and the front surface 3a of the contact plate 3.

More specifically, the annular spring portion 8 is elastically deformed, and the enlarged diameter portion 6a is always directed toward the front surface 3a of the contact plate 3 by the outer peripheral side portion 8c from the peripheral edge portion 8b of the insertion hole 8a of the annular spring portion 8. Press. As shown by the arrow in FIG. 8, the outer peripheral side portion 8c presses the enlarged diameter portion 6a toward the front surface 3a of the receiving plate 3 due to the elastic deformation of the annular spring portion 8. The resin pad 4 is crimped to the front surface 3a of the abutting plate 3 by the pressing force constantly applied by the annular spring portion 8 and is fixed to the abutting plate 3.

Similar to the previous embodiment, the resin pad 4 can be detachably fixed to the abutment plate 3 by using the fixing bolt 7. Since the peripheral edge 8b of the insertion hole 8a of the annular spring portion 8 is pressed by the head 7a of the fixing bolt 7 whose permanent deformation due to the creep phenomenon is extremely small as compared with the resin pad 4, this pressed state is long-term. It is maintained stable.

Then, since the enlarged diameter portion 6a is constantly pressed toward the front surface 3a of the contact plate 3 by utilizing the elastic deformation of the annular spring portion 8, the resin pad 4 (diameter enlarged portion 6a) with time due to the creep phenomenon. Even if the resin pad 4 is permanently compressed and deformed, the fixed state of the resin pad 4 can be maintained for a long period of time by suppressing loosening over time.

When the disk-shaped annular spring portion 8 is used as in this embodiment, the degree of elastic deformation can be easily changed by simply changing the number of the annular spring portions 8 stacked one above the other. Therefore, it becomes easy to adjust the pressing force of the annular spring portion 8 within an appropriate range.

1 Fender 2a, 2b Flange part 3 Reception plate 3a Front surface 3b Installation hole 4 Resin pad 5 Pad mounting hole 6 Inner peripheral surface 6a Diameter expansion part 7 Fixing bolt 7a Head 7b Shaft part 8 Circular spring part 8a Insertion hole 8b Peripheral portion of the insertion hole 8c Outer peripheral side portion than the peripheral edge portion of the insertion hole 8d One end portion 8e Second end side portion from one end portion 9 Resin pad (conventional product)
9a Counterbore 10 washer (conventional product)
11 quay

Claims (6)

A receiving plate fixed to the front end of the fender, a resin pad arranged on the front surface of the receiving plate, and a fixing portion for detachably fixing the resin pad to the front surface of the receiving plate. In the fixed structure of the resin pad for fender material
The fixing portion is inserted into the pad mounting hole penetrating the resin pad, the installation hole communicating with the pad mounting hole and formed in the receiving plate, the pad mounting hole, and the installation hole. A fixing bolt and an annular spring portion through which the fixing bolt is inserted are provided.
The inner peripheral surface of the pad mounting hole has a diameter-expanded portion having a larger inner diameter at a more forward position, and the annular spring portion comes into contact with the head of the fixing bolt and the diameter-expanded portion to contact the head. It is elastically deformed by being bridged between the diameter-expanded portion and the annular spring portion constantly presses the diameter-expanded portion toward the front surface of the receiving plate by the elastic deformation, and the resin pad is pressed. A fixed structure of a resin pad for a fender, which is crimped to the front surface of the abutting plate. The fixing structure of the resin pad for fender according to claim 1, wherein the annular spring portion has a spiral shape. The fixing structure of the resin pad for fender according to claim 1, wherein the annular spring portion has a disk shape. The fixing structure for a fender resin pad according to claim 3, wherein a plurality of disk-shaped annular spring portions are laminated one above the other. The fixing structure of a resin pad for a fender material according to any one of claims 1 to 4, wherein the enlarged diameter portion is a stepped surface. In the method of fixing the resin pad for fender, which is detachably fixed to the front surface of the fender, the resin pad arranged on the front surface of the aft plate fixed to the front end of the fender.
The inner peripheral surface of the pad mounting hole penetrating the resin pad is designed to have an enlarged diameter portion having a larger inner diameter at a more forward position, and the pad mounting hole is formed in the receiving plate. The fixing bolt is inserted into the pad mounting hole and the installation hole to fix it to the fender, and the annular spring portion through which the fixing bolt is inserted is inserted into the head of the fixing bolt and the diameter of the fixing bolt. The expanded portion is constantly pressed toward the front surface of the receiving plate by the annular spring portion by being brought into contact with the portion and elastically deformed by being bridged between the head portion and the enlarged diameter portion. A method for fixing a resin pad for a fender, which comprises crimping a resin pad to the front surface of the abutting plate.

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