JP7507188B2 - Repair method and repair member for guardrail posts - Google Patents

Description

The present invention relates to a method and a repair member for guardrail posts.

Conventionally, guardrails are installed on road shoulders, boundaries with sidewalks, median strips, etc., for the purpose of preventing vehicles from running off the road. Figure 15 shows an example of how guardrails are installed. The lower part of a guardrail post 10 is buried in the shoulder 2 of a road 3, and a guardrail 1 is attached to the upper part of the guardrail post 10.

As guardrail posts 10 are installed for many years, they deteriorate over time and corrode, especially near the ground level, and no longer have sufficient strength to withstand vehicle collisions. As a result, the existing guardrail posts 10 will eventually need to be pulled out and replaced, but this requires traffic restrictions, the temporary removal of the guardrail 1, and the need for specialized machinery to bury it, creating a significant workload.

In response to this, repair methods have been proposed that use existing guardrail posts. For example, Patent Document 1 describes an invention relating to a method of repairing cylindrical guardrail posts, in which the old post is cut and removed at the concrete foundation level, and a new cylindrical post is inserted and fixed into the cylindrical space at the base of the post that is embedded below the concrete foundation level.

Patent Documents 2 and 3 also describe an invention relating to a method of repairing guardrail posts, in which a reinforcing material with an expansion section that expands when pressure is applied to the inside is inserted into the cylindrical internal space of the post, and pressure is applied to the inside of the expansion section to expand it until it is pressed against the cylindrical inner surface of the post, reinforcing the post.

JP 2006-28820 A JP 2013-124471 A JP 2013-124473 A

However, the repair method described in Patent Document 1 requires cutting and removing the above-ground portion of the support, which wastes the above-ground portion and creates a large workload.

In addition, in the repair methods described in Patent Documents 2 and 3, when inserting the reinforcing material into the cylindrical interior of the support, the horizontal bolt (the bolt for fixing the guardrail mounting plate to the support) that penetrates the top of the support gets in the way, so this bolt must be temporarily removed, which is a heavy workload.

Also, there is a method of repairing without removing the bolts, in which two reinforcing bars are joined together to form a U-shape, and the joint is inserted inside the support so that it straddles the bolt, and concrete is then poured inside the support to harden, but this requires a lot of work.

The present invention aims to solve the above-mentioned problems of the past, and provides a method and repair parts for repairing guardrail posts that effectively utilize existing posts and reduces the workload.

In order to solve the above problems, the method for repairing a guardrail support of the present invention is a method for repairing a guardrail support whose lower part is buried in the ground and whose upper part has a horizontal bolt penetrating it, and is characterized by including a first insertion step of inserting a reinforcing tube having a vertical slit formed from the lower end toward the upper part and a horizontal slit for bolt evacuation formed to communicate with the middle part of the vertical slit into the inside of the guardrail support until the bolt passes through the vertical slit and reaches the horizontal slit for bolt evacuation, a first rotation step of rotating the reinforcing tube horizontally so that the bolt enters the horizontal slit for bolt evacuation, a reinforcing member attachment step of attaching a reinforcing member that fills the gap of the vertical slit, a second rotation step of rotating the reinforcing tube horizontally so that the bolt exits the horizontal slit for bolt evacuation, and a second insertion step of inserting the reinforcing tube into the inside of the guardrail support until the bolt passes through the vertical slit and reaches the upper end of the vertical slit.

It is also preferable that the reinforcing member is disposed at the ground edge of the guardrail support post.

It is also preferable that the reinforcing member is composed of a plate-shaped portion that is wider than the vertical slit and a fitting portion that protrudes from the plate-shaped portion and fits into the vertical slit.

It is also preferable that the reinforcing tube has a horizontal slit for preventing the bolt from coming out formed so as to communicate with the upper end of the vertical slit, and the method includes a third rotation step of rotating the reinforcing tube horizontally so that the bolt enters the horizontal slit for preventing the bolt from coming out.

The guardrail post repair member of the present invention is made up of a reinforcing tube and a reinforcing member used in the guardrail post repair method described above.

The guardrail post repair method of the present invention is a method for repairing a guardrail post with its lower part buried in the ground and its upper part penetrated by a horizontal bolt, and includes a first insertion step, a first rotation step, a reinforcing member attachment step, a second rotation step, and a second insertion step. The method uses a reinforcing tube and a reinforcing member. The reinforcing tube has a vertical slit formed from the lower end toward the upper part and a horizontal slit for bolt evacuation formed so as to communicate with the middle part of the vertical slit. The reinforcing member fills the gap in the vertical slit of the reinforcing tube, and can prevent a decrease in the strength of the reinforcing tube due to the vertical slit.

In the first insertion step, the reinforcing tube is inserted into the guardrail support until the bolt passes through the vertical slit and reaches the horizontal slit for bolt evacuation. At this time, the bolt passes through the vertical slit when the reinforcing tube is inserted, so it does not get in the way and there is no need to remove the bolt.

In the first rotation process, the reinforcing tube is rotated horizontally so that the bolt enters the horizontal slit for bolt evacuation, allowing the bolt to be removed from the vertical slit. As a result, when the reinforcing member is attached to the vertical slit in the reinforcing member attachment process, the bolt is not present in the vertical slit and does not get in the way.

In the second rotation step, the reinforcing tube is rotated horizontally so that the bolt comes out of the horizontal slit for bolt evacuation, allowing the bolt to be inserted into the vertical slit. As a result, when the reinforcing tube is reinserted into the guardrail support in the second insertion step, the bolt passes through the vertical slit until it reaches the top end of the vertical slit, and does not get in the way.

In addition, when the reinforcing member is placed at the ground edge of the guardrail post, the strength of the ground edge, which is most susceptible to corrosion due to aging, can be particularly increased.

In addition, when the reinforcing member is composed of a plate-shaped portion that is wider than the vertical slit and a fitting portion that fits into the vertical slit protruding from the plate-shaped portion, the gap of the vertical slit can be appropriately filled by the fitting portion, and the plate-shaped portion can be positioned relative to the reinforcing tube.

In addition, if the reinforcing tube has a horizontal slit formed to communicate with the upper end of the vertical slit to prevent it from coming loose, and a third rotation step is included in which the reinforcing tube is rotated horizontally so that the bolt enters the horizontal slit to prevent it from coming loose, it is possible to prevent the reinforcing tube from coming loose from the guardrail post in the event of a vehicle collision, etc.

The guardrail post repair member of the present invention is made up of a reinforcing tube and a reinforcing member, and can be used in the guardrail post repair method described above.

In this way, the present invention can provide a method and repair parts for repairing guardrail posts that effectively utilize existing posts and that do not require the removal of existing bolts, resulting in a light workload.

1A is a plan view, FIG. 1B is a front view, FIG. 1C is a left side view, and FIG. 1A is a plan view of a reinforcing tube, (B) a front view, (C) a left side view, (D) a rear view, (E) a bottom view, and (F) an enlarged view of part a. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a right side view showing the reinforcing member. FIG. 2A is a front view showing the top cover, and FIG. FIG. 1 is a process diagram showing a method for repairing a guardrail post. FIG. 13 is a detailed explanatory diagram of a method for repairing a guardrail post. FIG. 13 is a detailed explanatory diagram of a method for repairing a guardrail post. FIG. 13 is a detailed explanatory diagram of a method for repairing a guardrail post. FIG. 13 is a detailed explanatory diagram of a method for repairing a guardrail post. FIG. 13 is a detailed explanatory diagram of a method for repairing a guardrail post. FIG. 13 is a detailed explanatory diagram of a method for repairing a guardrail post. FIG. 13 is a detailed explanatory diagram of a method for repairing a guardrail post. FIG. 13 is a detailed explanatory diagram of a method for repairing a guardrail post. 13A is a plan view, FIG. 13B is a front view, FIG. 13C is a left side view, FIG. 13D is a rear view, FIG. 13E is a bottom view, and FIG. 13F is an enlarged view of part a, showing a reinforcing tube according to another embodiment. FIG. 1 is a diagram showing an example of an installation state of a guardrail.

Next, a guardrail post repair method and repair members according to an embodiment of the present invention will be described with reference to Figures 1 to 15. The guardrail post repair method according to this embodiment repairs a guardrail post 10 shown in Figure 15. First, each member in the guardrail post repair method will be described. Each member is made of a metal such as steel.

(Guardrail posts)
1A is a plan view, (B) a front view, (C) a left side view, and (D) a rear view of a guardrail post 10. The guardrail post 10 is an existing post, and is composed of a hollow cylindrical post portion 11. The lower part of the cylindrical post portion 11 is buried in the ground, and the part above the ground level GL stands upright above the ground as shown in FIG.

The mounting plate 12 is fixed to the top of the cylindrical support portion 11 with bolts 14 and nuts 15. The mounting plate 12 is for attaching the guardrail 1 to the guardrail support 10, and the guardrail 1 is fixed by inserting bolts into the mounting holes 13, 13. In this way, the bolts 14 penetrate horizontally into the top of the existing guardrail support 10.

(Reinforcing tube)
2 shows the reinforcing pipe 20 in (A) a plan view, (B) a front view, (C) a left side view, (D) a rear view, (E) a bottom view, and (F) an enlarged view of part a. The reinforcing pipe 20 is inserted into the guardrail support 10, and is composed of a reinforcing tubular pipe section 21 that is smaller in diameter than the guardrail support 10 and has a hollow interior. The length of the reinforcing tubular pipe section 21 is longer than the above-ground portion of the guardrail support 10, and when inserted into the guardrail support 10, the lower part of the reinforcing tubular pipe section 21 is positioned across the top and bottom of the ground-level portion GL.

Two vertical slits 22, 22 are formed in the reinforcing tube 21 from the lower end toward the upper part. The two vertical slits 22, 22 are formed at opposing positions on the reinforcing tube 21 with the same length. It is preferable that the width of the vertical slits 22, 22 is as narrow as possible within a range that allows the bolt 14 to pass through smoothly. In addition, it is preferable that the distance between the upper end of the reinforcing tube 21 and the upper end of the vertical slit 22 is set to be approximately equal to the distance between the upper end of the support tube 11 and the bolt 14.

In addition, horizontal slits 23, 23 for bolt evacuation are formed in the reinforcing tube 21 so as to communicate with the middle of each vertical slit 22. The horizontal slits 23, 23 are formed with the same length and in a point-symmetrical orientation (same rotational direction on the circumference) with respect to the central axis of the reinforcing tube 21. In this embodiment, the horizontal slits 23, 23 are formed in a counterclockwise direction from the vertical slits 22, 22 when viewed from above. The length of the horizontal slits 23 is not particularly limited, but can be, for example, 1/5 to 1/4 of the circumference. In addition, the middle part of the vertical slits 22 does not mean the center in the vertical direction, and the vertical position of the horizontal slits 23 is set to a position that ensures a distance between the upper end of the vertical slits 22 and the horizontal slits 23 so that the reinforcing member 30 described later can be smoothly attached.

The reinforcing tube 21 also has horizontal slits 24, 24 formed therein to prevent the bolt from coming out so as to communicate with the upper ends of the vertical slits 22. The horizontal slits 24, 24 are formed with the same length and in a point-symmetrical orientation (same rotational direction on the circumference) with respect to the central axis of the reinforcing tube 21. In this embodiment, the horizontal slits 24, 24 are formed in a clockwise direction from the vertical slits 22, 22 when viewed from above. The length of the horizontal slits 24 is not particularly limited, but can be, for example, 1/5 to 1/4 of the circumference. The horizontal slits 24 for preventing the bolt from coming out are formed in the opposite direction to the horizontal slits 23 for bolt retraction, but they can also be formed in the same direction.

The lower end of the vertical slit 22 is provided with protrusions 25, 25. The protrusions 25, 25 are intended to abut against the lower end of the reinforcing member 30 (described later) to provide support from below.

The strength can also be improved by providing ribs on the reinforcing tubular portion 21. For example, by providing multiple vertical ribs at intervals on the lower portion of the reinforcing tubular portion 21 (the portion that is positioned above and below the ground portion GL when installed), the strength of the ground portion, which is highly susceptible to corrosion due to aging, can be particularly increased. Similarly, the strength of the ground portion can also be increased by attaching a semicircular cross-section member that is obtained by vertically dividing a tubular member in two to the lower portion of the reinforcing tubular portion 21 while avoiding the vertical slits 22, 22.

(Reinforcing member)
3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a right side view showing the reinforcing member 30. The reinforcing member 30 fills the gap of the vertical slit 22 of the reinforcing tube 20, and prevents a decrease in the strength of the reinforcing tube 20 due to the vertical slit 22. The reinforcing member 30 is composed of a plate-shaped portion 31 and fitting portions 32, 32, 32.

The plate-like portion 31 is a long plate material and is formed to be wider than the vertical slit 22 of the reinforcing tube 20. In addition, the fitting portions 32, 32, 32 are arranged at intervals along the longitudinal direction so as to protrude from the plate-like portion 31, and are formed to a width that fits into the vertical slit 22 of the reinforcing tube 20.

(Top cover)
4A is a front view and FIG. 4B is a bottom view showing the top cover 40. The top cover 40 is composed of a cylindrical edge portion 41 and a conical umbrella portion 42, and is attached to the upper end of the existing guardrail support 10 to prevent rainwater, etc. from entering the support.

Next, the guardrail post repair method according to this embodiment will be described in detail. Figure 5 is a process diagram showing the guardrail post repair method. Figures 6 to 13 are detailed explanatory diagrams of the guardrail post repair method, and the numbers in parentheses in each figure correspond to the numbers in parentheses in Figure 5. Note that although the guardrail 1 is omitted from each figure, the guardrail 1 does not need to be removed from the post and is repaired in its current state.

The guardrail post repair method according to this embodiment includes a first insertion step, a first rotation step, a reinforcing member attachment step, a second rotation step, a second insertion step, and a third rotation step. The top cover 40 is removed from the existing guardrail post 10 in advance.

(First Insertion Step)
First, as shown in Figures 5 to 7, the reinforcing tube 20 is inserted into the guardrail support 10. At this time, if the bolt 14 passes through the vertical slits 22, 22 of the reinforcing tube 20, the bolt 14 does not get in the way and does not need to be removed. When the bolt 14 reaches the horizontal slits 23, 23 for bolt evacuation, the insertion is interrupted.

(First rotation process)
5 and 8, the reinforcing tube 20 is rotated clockwise so that the bolt 14 enters the bolt avoidance horizontal slits 23, 23. This allows the bolt 14 to be removed from the vertical slits 22, 22.

(Reinforcing member mounting process)
Next, reinforcing members 30, 30 that fill the gaps between the vertical slits 22, 22 are attached, as shown in Figures 5 and 8. At this time, the fitting portion 32 of the reinforcing member 30 is fitted into the vertical slit 22, and the plate-like portion 31 is dropped from the upper portion of the vertical slit 22 while being brought into contact with the outer surface of the reinforcing tube 20. Note that, in order to easily attach the reinforcing member 30, the distance between the upper end of the vertical slit 22 and the horizontal slit 23 is set so that the length of the portion of the vertical slit 22 above the upper end of the guardrail support 10 is longer than the length of the reinforcing member 30.

The dropped reinforcing member 30 is supported by the protrusions 25, 25 provided at the lower end of the vertical slit 22. When the reinforcing member 30 is dropped, the bolt 14 does not get in the way because it is not present in the vertical slit 22.

(Second rotation process)
5 and 9, the reinforcing tube 20 is rotated left so that the bolt 14 comes out of the bolt avoidance horizontal slits 23, 23. This allows the bolt 14 to be inserted into the vertical slits 22, 22 again.

(Second Insertion Step)
5 and 10, the reinforcing tube 20 is inserted again into the guardrail support 10. At this time, the bolt 14 does not get in the way because it passes through the vertical slits 22, 22 of the reinforcing tube 20. When the bolt 14 reaches the upper end of the vertical slits 22, 22, the insertion is complete.

Figure 11 shows (A) a longitudinal cross-sectional view, (B) an a-a cross-sectional view, and (C) a-b cross-sectional view, showing the state after the second insertion step is completed. As shown in Figure 11, the reinforcing members 30, 30 attached to the lower part of the reinforcing tube 20 are placed at the ground level GL of the buried guardrail post 10. In other words, the reinforcing members 30, 30 are placed across the top and bottom of the ground level GL. For example, the length of the reinforcing member 30 can be set to 30 cm, and it can be placed 15 cm above and below the ground level GL. This can particularly increase the strength of the ground level GL, which is highly susceptible to corrosion due to aging.

(Third rotation process)
5 and 12, the reinforcing tube 20 is rotated left so that the bolt 14 enters the horizontal slits 24, 24 for preventing disengagement. This restricts the vertical movement of the reinforcing tube 20 and prevents the reinforcing tube 20 from disengaging from the guardrail post 10 in the event of a vehicle collision, etc.

Figure 13 shows the state after the third rotation step is completed, with (A) a vertical cross-sectional view, (B) a-a cross-sectional view, (C) b-b cross-sectional view (upper part) and c-c cross-sectional view (lower part). As shown in Figure 13, the bolt 14 is located in the horizontal slit 24, not in the vertical slit 22, so the reinforcing tube 20 cannot move up and down relative to the guardrail support 10.

Finally, the top cover 40 is placed over the guardrail post to complete the repair method.

The guardrail post repair method according to this embodiment is a method for repairing a guardrail post 10, the lower part of which is buried in the ground and the upper part of which is penetrated by a horizontal bolt 14, and includes a first insertion step, a first rotation step, a reinforcing member attachment step, a second rotation step, and a second insertion step. The method uses a reinforcing tube 20 and a reinforcing member 30. The reinforcing tube 20 has vertical slits 22, 22 formed from the lower end toward the upper part, and horizontal slits 23, 23 for bolt evacuation formed to communicate with the intermediate parts of the vertical slits 22, 22. The reinforcing member 30 fills the gaps in the vertical slits 22, 22 of the reinforcing tube 20, and can prevent a decrease in the strength of the reinforcing tube 20 due to the vertical slits 22, 22.

In the first insertion step, the reinforcing tube 20 is inserted into the guardrail support 10 until the bolt 14 passes through the vertical slits 22, 22 and reaches the horizontal slits 23, 23 for bolt evacuation. At this time, the bolt 14 passes through the vertical slits 22, 22 when the reinforcing tube 20 is inserted, so it does not get in the way and there is no need to remove the bolt 14.

In the first rotation step, the reinforcing tube 20 is rotated horizontally so that the bolt 14 enters the horizontal slits 23, 23 for bolt evacuation, and the bolt 14 can be removed from the vertical slits 22, 22. As a result, when the reinforcing members 30, 30 are attached to the vertical slits 22, 22 in the reinforcing member attachment step, the bolt 14 is not present in the vertical slits 22, 22 and does not get in the way.

In the second rotation step, the reinforcing tube 20 is rotated horizontally so that the bolt 14 comes out of the horizontal slits 23, 23 for bolt evacuation, and the bolt 14 can be inserted into the vertical slits 22, 22. As a result, when the reinforcing tube 20 is inserted again into the guardrail support 10 in the second insertion step, the bolt 14 passes through the vertical slits 22, 22 until it reaches the upper end of the vertical slits 22, 22, and does not get in the way.

In addition, since the reinforcing members 30, 30 are placed at the ground level GL of the guardrail post 10, the strength of the ground level GL, which is most susceptible to corrosion due to aging, can be particularly increased.

In addition, the reinforcing member 30 is composed of a plate-like portion 31 that is wider than the vertical slit 22 and fitting portions 32, 32, 32 that fit into the vertical slit 22 protruding from the plate-like portion 31. The fitting portions 32, 32, 32 can adequately fill the gap in the vertical slit 22, and the plate-like portion 31 can be used to position the reinforcing tube 20.

In addition, the reinforcing tube 20 has horizontal slits 24, 24 formed to communicate with the upper ends of the vertical slits 22, 22 to prevent it from coming loose, and a third rotation process is included in which the reinforcing tube 20 is rotated horizontally so that the bolt 14 enters the horizontal slits 24, 24 to prevent it from coming loose from the guardrail post 10 in the event of a vehicle collision, etc.

The guardrail post repair member of this embodiment is made up of a reinforcing tube 20 and a reinforcing member 30, and can be used in the guardrail post repair method described above.

In this way, the guardrail post repair method and repair members of this embodiment make effective use of the existing posts and reduce the workload by eliminating the need to remove existing bolts.

Figure 14 shows a reinforcing tube 50 according to another embodiment, with (A) a plan view, (B) a front view, (C) a left side view, (D) a rear view, (E) a bottom view, and (F) an enlarged view of part a. The reinforcing tube 50 has almost the same configuration as the reinforcing tube 20, but differs in that it has two horizontal slits 53 for bolt evacuation formed in the vertical direction and two horizontal slits 54 for preventing bolts from falling out formed in the vertical direction. This is based on the assumption that there are two horizontal bolts in the vertical direction at the top of an existing guardrail support. The reinforcing tube 50 can be used in the same way as the reinforcing tube 20. When there are two bolts, in addition to providing two horizontal slits, a wide horizontal slit may be provided in the vertical direction.

The guardrail post repair method and repair members according to this embodiment have been described above, but the present invention is not limited to the above-described embodiment, and various other modifications are possible.

For example, there are no particular limitations on the shape or length of the reinforcing member to be attached to the vertical slit, as long as it can fill the gap in the vertical slit.

In addition, in the above embodiment, the rotation direction of the reinforcing tube is the first rotation process (right rotation), the second rotation process (left rotation), and the third rotation process (left rotation), but it can also be the opposite direction to the above embodiment, such as the first rotation process (left rotation), the second rotation process (right rotation), and the third rotation process (right rotation). To achieve this, the formation directions of the horizontal slits for bolt evacuation and the horizontal slits for preventing dislodging are opposite to those of the above embodiment. Also, if the formation directions of the horizontal slits for bolt evacuation and the horizontal slits for preventing dislodging are the same, the rotation directions of the first rotation process and the third rotation process will be the same.

In addition, it is not necessary to provide the horizontal slits 24, 24 to prevent the bolt from coming out, and the third rotation step may be omitted and the second insertion step completed. In that case, it is preferable to provide a separate restricting means to prevent the bolt 14 from moving within the vertical slit 22 after the repair is completed.

REFERENCE SIGNS LIST 1 Guardrail 2 Road shoulder 3 Road 10 Guardrail support 11 Support cylindrical section 12 Mounting plate 13 Mounting hole 14 Bolt 15 Nut 20 Reinforcing tube 21 Reinforcing tube cylindrical section 22 Vertical slit 23 Horizontal slit for bolt evacuation 24 Horizontal slit for preventing dislodging 25 Projection 30 Reinforcing member 31 Plate-shaped section 32 Fitting section 40 Top cover 41 Edge section 42 Umbrella section 50 Reinforcing tube 51 Cylindrical section 52 Vertical slit 53 Horizontal slit for bolt evacuation 54 Horizontal slit for preventing dislodging 55 Projection GL Ground edge section

Claims (5)

A method for repairing a guardrail post having a lower part buried in the ground and a horizontal bolt passing through an upper part, comprising the steps of:
a first insertion step of inserting a reinforcing tube having a vertical slit formed from a lower end portion toward an upper portion and a horizontal slit for bolt evacuation formed so as to communicate with an intermediate portion of the vertical slit into the inside of the guardrail support until the bolt passes through the vertical slit and reaches the horizontal slit for bolt evacuation;
a first rotation step of rotating the reinforcing tube in a horizontal direction so that the bolt enters the bolt retracting horizontal slit;
a reinforcing member mounting step of mounting a reinforcing member that fills the gap of the vertical slit;
a second rotating step of rotating the reinforcing tube in a horizontal direction so that the bolt comes out of the bolt retracting horizontal slit;
a second insertion step of inserting the reinforcing pipe into the guardrail support until the bolt passes through the vertical slit and reaches an upper end of the vertical slit;
A method for repairing a guardrail post, comprising: The method for repairing a guardrail post according to claim 1, characterized in that the reinforcing member is placed at the ground edge of the guardrail post. The method for repairing a guardrail support pole according to claim 1 or 2, characterized in that the reinforcing member is composed of a plate-shaped portion that is wider than the vertical slit and a fitting portion that protrudes from the plate-shaped portion and fits into the vertical slit. The method for repairing a guardrail support pole according to any one of claims 1 to 3, characterized in that the reinforcing pipe has a horizontal slit for preventing the bolt from coming out formed so as to communicate with the upper end of the vertical slit, and includes a third rotation step of rotating the reinforcing pipe horizontally so that the bolt enters the horizontal slit for preventing the bolt from coming out. A guardrail post repair component comprising a reinforcing tube and a reinforcing member used in the guardrail post repair method according to any one of claims 1 to 4.

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