JP7529254B2 - Support device for above-ground structure and construction method thereof - Google Patents

Description

The present invention relates to a support device that supports the legs of an above-ground structure while it is installed underground, and a construction method thereof.

As an example of a support device that supports the legs of above-ground structures such as road signs and guardrails while they are installed underground, Patent Document 1 discloses a pile foundation in which the legs (column bases) of the above-ground structure are inserted into a cylindrical joint and filled with concrete.

However, in the pile foundation of Patent Document 1, the legs (column bases) of the above-ground structure are integrally joined to the pile foundation (cylindrical joint) via filled concrete. Therefore, when replacing the above-ground structure due to damage, etc., it is necessary to chip away the concrete filled inside the cylindrical joint. However, since the concrete is filled in the narrow space between the inner surface of the joint and the legs and is in a constrained state, it is difficult to break the concrete even with a crushing device. Furthermore, if the concrete is in a large cracked state, it is difficult to remove it from inside the joint, so the concrete must be crushed into very small pieces. Therefore, the replacement work is very difficult and time-consuming and costly.

Patent No. 5449124

The problem that this invention aims to solve is to provide a support device and a construction method that can be easily replaced when replacement is required due to damage to above-ground structures.

One aspect of the present invention is a support device that supports the legs of an above-ground structure while it is installed underground, and includes a support unit that supports the legs, and the support unit has a cylindrical portion with an opening limited in size to allow the legs to be inserted, non-adhesive granules that are filled up to the top end of the cylindrical portion when the legs are inserted into the cylindrical portion, and a first hardened layer that is positioned above the top end of the cylindrical portion.

In this way, since the cylindrical part is filled with non-adhesive granules up to the top end with the legs inserted in the cylindrical part, when the above-ground structure is damaged and needs to be replaced, the legs can be easily pulled out of the cylindrical part by removing the first hardened layer located above the top end of the cylindrical part using a crushing device. Also, if the part below the first hardened layer is sound, it can be reused.
In addition, the non-adhesive granules are filled up to the top end of the cylindrical portion, and the first hardened layer is positioned above the top end of the cylindrical portion, covering the sides of the legs, positioning them and holding them securely and firmly.
The first hardened layer disposed above the upper end of the cylindrical portion functions as a lid that covers the non-adhesive granules that have been filled up to the upper end of the cylindrical portion.

In this support device, the support unit can include a second hardened layer disposed between the lower end of the leg and the lower end of the tubular portion. By including the second hardened layer in this manner, the height of the leg can be easily adjusted. In addition, when the leg is hollow, this second hardened layer functions as a lid that closes the lower end of the leg to prevent non-adhesive particles from flowing into the hollow space.

In addition, in this support device, the support unit can include a bottom portion provided at the lower end of the tubular portion, and a pile portion attached directly or indirectly to the bottom portion. By including the bottom portion and the pile portion in this manner, the pile portion and the support unit can be connected via the bottom portion.

This support device can further include a cylindrical block with an opening limited to a size that allows the cylindrical portion to be inserted, non-adhesive granules filled to the upper end of the cylindrical block when the cylindrical portion is inserted into the cylindrical block, and a third hardened layer arranged above the upper end of the cylindrical block. In this way, when the cylindrical portion is inserted into the cylindrical block, the non-adhesive granules are filled to the upper end of the cylindrical block. Therefore, when the cylindrical portion is damaged and replacement of the support unit becomes necessary, the entire support unit including the cylindrical portion can be easily pulled out from the cylindrical block by removing the first hardened layer arranged above the upper end of the cylindrical portion and the third hardened layer arranged above the upper end of the cylindrical block using a crushing device.

Another aspect of the present invention is a construction method for a support device that supports the legs of an above-ground structure while installed underground, wherein the support device includes a support unit that supports the legs, the support unit including a cylindrical portion, and the construction method includes inserting the legs into the cylindrical portion, filling non-adhesive granules up to an upper end of the cylindrical portion, and arranging a first hardened layer above the upper end of the cylindrical portion.
As a result, if the above-ground structure is damaged and needs to be replaced, the first hardened layer located above the upper end of the tubular section can be removed using a crushing device, allowing the legs to be easily pulled out of the tubular section, and if the area below the first hardened layer is sound, it can be reused.

The construction method of this support device can also include disposing a second hardened layer between the lower end of the leg and the lower end of the tubular section before inserting the leg into the tubular section. This allows the height of the leg to be easily adjusted, and also acts as a lid to close the lower end of the leg to prevent non-adhesive particles from entering the hollow space if the leg is hollow.

The construction method of this support device can include installing a cylindrical block, filling the cylindrical block with non-adhesive granules up to the top end with the cylindrical portion inserted into the cylindrical block, and arranging a third hardened layer above the top end of the cylindrical block. In this way, when it becomes necessary to replace the support unit due to damage to the cylindrical portion, the first hardened layer arranged above the top end of the cylindrical portion and the third hardened layer arranged above the top end of the cylindrical block can be removed using a crushing device, making it possible to easily pull out the entire support unit including the cylindrical portion from the cylindrical block.

The present invention provides a support device and a construction method that can be easily replaced when replacement is required due to damage to an above-ground structure.

1 is a vertical cross-sectional view showing a state in which a support device for a ground structure according to one embodiment of the present invention is used. 5A and 5B show a state in which a support device for a ground structure according to another embodiment of the present invention is in use, where (a) is a longitudinal sectional view and (b) is a sectional view taken along the line A-A of (a).

FIG. 1 shows a state in which a support device 10A for a ground structure according to one embodiment of the present invention is used.
This support device 10A supports the legs 21 of a cylindrical car stop bollard 20, which is an above-ground structure, in a state in which the leg 21 is installed underground, and includes a support unit 12 that supports the legs 21. A cap 22 is attached to the upper end of the car stop bollard 20.
The support unit 12 has a cylindrical tubular portion 12a having an opening 12a-1 limited in size so that the leg portion 21 can be inserted, sand 12b which is a non-adhesive granular material that is filled up to the upper end of the tubular portion 12a when the leg portion 21 is inserted into the tubular portion 12a, and a first mortar layer 12c which is a first hardened layer that is positioned above the upper end of the tubular portion 12a.

In this embodiment, since sand 12b is filled up to the upper end of cylindrical portion 12a with leg 21 inserted in cylindrical portion 12a, when bollard 20 is damaged and needs to be replaced, leg 21 can be easily pulled out from cylindrical portion 12a by removing first mortar layer 12c located above the upper end of cylindrical portion 12a with a crushing device such as a concrete breaker. This makes it possible to reuse the portion below first mortar layer 12c if it is sound.
In addition, with the leg 21 inserted into the tubular portion 12a, whose opening 12a-1 is limited to a size that allows the leg 21 to be inserted, sand 12b is filled up to the upper end of the tubular portion 12a, and the first mortar layer 12c, which is the first hardened layer, is positioned above the upper end of the tubular portion, thereby covering the leg 21 from the side, positioning it and holding it securely and firmly.
The first mortar layer 12c disposed above the upper end of the cylindrical portion 12a functions as a lid that covers the sand 12b that has been filled up to the upper end of the cylindrical portion 12a.

In this embodiment, the support unit 12 has a second mortar layer 12d, which is a second hardened layer, disposed between the lower end of the leg portion 21 and the lower end of the cylindrical portion 12a.
By disposing the second mortar layer 12d in this manner, it is possible to easily adjust the height of the leg 21. Furthermore, when the leg 21 is hollow, the second mortar layer 12d functions as a lid that closes the lower end of the leg 21 to prevent the sand 12b from flowing into the hollow space.
In this embodiment, the second mortar layer 12d is disposed, but it is not essential and may be omitted. When omitting it, if the leg 21 is hollow, the lower end of the leg 21 may be covered with another means such as a lid, and if the height of the leg 21 needs to be adjusted, it may be adjusted by another means.

In this embodiment, the support unit 12 includes a bottom portion 12e provided at the lower end of the cylindrical portion 12a, and a pile portion 11 directly or indirectly attached to the bottom portion 12e. By including the bottom portion 12e and the pile portion 11 in this manner, the pile portion 11 and the support unit 12 can be connected via the bottom portion 12e.
In this embodiment, the pile portion 11 has an intermediate portion 11a and a spiral tip portion 11b, and the cylindrical portion 12a, the bottom portion 12e, the intermediate portion 11a and the tip portion 11b are integrally molded from cast iron.

The support device 10A of this embodiment includes a bottom 12e provided at the lower end of the tubular portion and a pile portion 11 directly or indirectly attached to the bottom 12e, but the support device 10A is not limited to the one described in this embodiment, and may also include one that does not have a pile portion 11, such as a steel pipe pile that is continuous from the pile head to the pile tip. The tubular portion 12a, bottom 12e, middle portion 11a, and tip portion 11b are also not limited to the one described in this embodiment, and may be made of steel instead of cast iron, the tip portion 11b may have a known shape of a pile tip portion, the middle portion 11a may be omitted and the tip portion 11b may be directly attached to the bottom 12e, or each part may be molded separately rather than integrally and joined together.

In addition, in this embodiment, the tubular portion 12a is cylindrical, but the tubular portion 12a is not limited to a cylindrical shape and may be, for example, a rectangular tube. Similarly, the leg portion 21 is not limited to a hollow cylindrical shape and may be solid or rectangular.

In this embodiment, the opening 12a-1 of the cylindrical portion 12a is limited in size to allow the leg portion 21 to be inserted therein, but the specific size can be appropriately determined within the scope of common technical knowledge.
If the gap between the inner peripheral surface of the cylindrical portion 12a and the outer peripheral surface of the leg 21 is too small, when installing an above-ground structure having multiple legs such as a guard fence underground, a discrepancy between the spacing between the legs and the spacing between the support devices cannot be tolerated, and the support devices must be installed accurately, which requires a great deal of effort. On the other hand, if the gap between the inner peripheral surface of the cylindrical portion 12a and the outer peripheral surface of the leg 21 is too large, problems such as the above-ground structure tilting will occur.
From the above, for example, it is preferable that the size of the opening 12a-1 is small enough that the size of the gap between the inner peripheral surface of the cylindrical portion 12a and the outer peripheral surface of the leg portion 21 cannot insert a tip tool of a crushing device such as a concrete breaker. More specifically, it is preferable that the size of the gap between the inner peripheral surface of the cylindrical portion 12a and the outer peripheral surface of the leg portion 21 is about 5 to 20 mm. Incidentally, in this embodiment, the diameter of the opening 12a-1 (the inner diameter of the cylindrical portion 12a) is 140 mm, the outer diameter of the leg portion 21 is 114 mm, the gap between the inner peripheral surface of the cylindrical portion 12a and the outer peripheral surface of the leg portion 21 is 13 mm, and it is more preferable that the size of the gap is about 10 to 15 mm.

Since the sand 12b filled to the upper end of the cylindrical portion 12a is filled without being stuck, the legs 21 can be easily pulled out from the cylindrical portion 12a without using a crushing device. Therefore, even if the size of the gap between the inner peripheral surface of the cylindrical portion 12a and the outer peripheral surface of the legs 21 is so small that the tip tool of a crushing device such as a concrete breaker cannot be inserted, the legs 21 can be easily pulled out from the cylindrical portion 12a.
As mentioned above, the first mortar layer 12c located above the upper end of the tubular portion 12a needs to be removed when pulling the leg portion 12a out of the tubular portion 12a, but this can be easily removed using a crushing device such as a concrete breaker.

In this embodiment, the first mortar layer 12c is placed to the same height as the road surface (GL surface), but this is not limited to this. For example, the first mortar layer 12c may be placed to a height slightly lower than the road surface (GL surface), and then backfill soil and asphalt pavement 31 may be placed above it.

In this embodiment, sand is used as the non-adhesive granules, but the non-adhesive granules are not limited to sand, and other non-adhesive granules such as gravel, crushed stone, soil, iron particles, ceramic particles, etc. can also be used alone or in combination with sand.

In this embodiment, the first and second hardened layers are mortar layers 12c and 12d, but the first and second hardened layers are not limited to mortar layers and may be, for example, concrete layers. As described below, it is preferable that the second hardened layer is a mortar layer formed by hardening dry mortar.

Next, a method for installing the support device 10A will be described.
This construction method includes arranging a second mortar layer 12d, which is a second hardened layer, between the lower end of the leg 21 and the lower end of the cylindrical portion 12a, inserting the leg 21 into the cylindrical portion 12a, filling the cylindrical portion 12a with sand 12b, which is a non-adhesive granular material, up to the upper end of the cylindrical portion 12a, and arranging a first mortar layer 12c, which is a first hardened layer, above the upper end of the cylindrical portion 12a. A more specific explanation is as follows.

First, as shown in FIG. 1, in the ground 30 containing the asphalt pavement 31 and the roadbed 32, the asphalt pavement 31 is removed by, for example, 300 mm square, and preliminary excavation is performed from the road surface (GL surface) to, for example, 300 mm square x 350 mm high, and the pile portion 11 is buried in the ground using a pile driver.

Next, the second mortar layer 12d is filled with dry mortar up to a position about +100 mm from the lower end (bottom 12e) of the cylindrical portion 12a, and the lower end of the leg 21 is inserted about 10 mm into the dry mortar to adjust the height of the above-ground structure. That is, in this embodiment, the second mortar layer 12d is placed between the lower end of the leg 12a and the lower end of the cylindrical portion 12a, and then the leg 21 is inserted into the cylindrical portion 12a.

After the dry mortar has hardened, sand 12b is filled into the gap between the cylindrical portion 12a and the leg portion 21 up to the top end of the cylindrical portion 12a.

Next, fill the preliminary excavation range (□300×h350 mm) with mortar and finish the surface with a metal trowel. In this way, the first mortar layer 12c, which is the first hardened layer, is placed above the upper end of the cylindrical portion 12a. In this embodiment, the first mortar layer 12c, which is the first hardened layer, is placed above the upper end of the cylindrical portion 12a by filling the preliminary excavation range (□300×h350 mm) with mortar, so that the first mortar layer 12c is integrated with the surrounding mortar layer 12f placed around the cylindrical portion 12a, but in FIG. 1, the first mortar layer 12c and the surrounding mortar layer 12f are virtually distinguished by dashed lines. The first mortar layer 12c and the surrounding mortar layer 12f may be placed (constructed) separately.
In addition, in this embodiment, mortar is filled in the preliminary excavation range (□300×h350 mm), i.e., the first mortar layer 12c is placed up to the same height as the road surface (GL surface), but this is not limited to this. For example, mortar may be filled up to a height slightly lower than the road surface (GL surface), and then backfill soil and asphalt pavement 31 may be placed above it.

In the re-construction, the area around the car stop bollard 20 is removed up to the top of the cylindrical portion 12a using a crushing device such as a concrete breaker, and the legs 21 are pulled out from the cylindrical portion 12a. After that, the sand 12b inside the cylindrical portion 12a is temporarily removed, and the hard mortar is filled again, and the legs 21 of the new car stop bollard 20 are inserted into the cylindrical portion 12a. Next, as in the previous construction, the gap between the cylindrical portion 12a and the legs 21 is filled with sand 12b up to the top of the cylindrical portion 12a, and then the first mortar layer 12c, which is the first hardened layer, is placed above the top of the cylindrical portion 12a. Note that when the area around the car stop bollard 20 is removed using a crushing device such as a concrete breaker, if the upper part of the surrounding mortar layer 12f is also removed, a mortar layer is also placed above the removed surrounding mortar layer 12f when the first mortar layer 12c is placed.

In the above construction method, the legs 21 are inserted into the cylindrical portion 12a, and then the cylindrical portion 12a is filled with sand 12b, which is a non-adhesive granular material, up to the top end. However, the legs 21 may be inserted into the cylindrical portion 12a after filling the cylindrical portion 12a with sand 12b, which is a non-adhesive granular material, up to the top end. In this case, the legs 21 may be inserted into the cylindrical portion 12a so as to penetrate the filled sand 12b.

In the above construction method, the second mortar layer 12d, which is a second hardened layer, is placed between the lower end of the leg 21 and the lower end of the cylindrical portion 12a before the leg 21 is inserted into the cylindrical portion 12a, but the placement of the second mortar layer 12d can be omitted. In this case, if the leg 21 is hollow, the lower end of the leg 21 can be closed with another means such as a lid, and the height of the leg 21 can be adjusted by another means.
Although the dry mortar was used to form the second mortar layer 12d, ordinary mortar may also be used, although the dry mortar is preferably used in terms of workability.

Next, another embodiment of the present invention will be described. Fig. 2 shows a support device 10B for a ground structure according to another embodiment of the present invention in use.
In addition to the configuration of the support device 10A in Fig. 1 described above, this support device 10B further includes a cylindrical block 13 with an opening 13a limited in size to allow the cylindrical portion 12a to be inserted, sand 14, which is a non-adhesive granular material, filled up to the upper end of the cylindrical block 13 with the cylindrical portion 12a inserted into the cylindrical block 13, and a third mortar layer 15, which is a third hardened layer, disposed above the upper end of the cylindrical block. Therefore, in the support device 10B in Fig. 2, the same components as those in the support device 10A in Fig. 1 are denoted by the same reference numerals, and their description will be omitted.

In this embodiment, with the cylindrical portion 12a inserted into the cylindrical block 13, sand 14 is filled up to the upper end of the cylindrical block 13. Therefore, if the support unit 12 needs to be replaced due to damage to the cylindrical portion 12a, the entire support unit 12 including the cylindrical portion 12a can be easily pulled out from the cylindrical block 13 by removing the first mortar layer 12c located above the upper end of the cylindrical portion 12a and the third mortar layer 15 located above the upper end of the cylindrical block 13 using a crushing device such as a concrete breaker.
The third mortar layer 15 disposed above the upper end of the cylindrical block 13 functions as a lid that covers the sand 14 that has been filled up to the upper end of the cylindrical block 13 .

In this embodiment, the cylindrical block 13 has a square concrete block body with a circular opening 13a. The size of this opening 13a is limited to a size that allows the cylindrical portion 12a to be inserted, but the specific size can be determined appropriately within the bounds of common technical knowledge.
If the gap between the inner peripheral surface of the cylindrical block 13 and the outer peripheral surface of the cylindrical portion 12a is too small, it becomes difficult to insert the cylindrical portion 12a into the opening 13a of the cylindrical block 13. On the other hand, if the gap between the inner peripheral surface of the cylindrical block 13 and the outer peripheral surface of the cylindrical portion 12a is too large, problems such as the cylindrical portion 12a being easily tilted occur.
From the above, for example, it is preferable that the size of the opening 13a is small enough that the size of the gap between the inner peripheral surface of the cylindrical block 13 and the outer peripheral surface of the cylindrical portion 12a cannot insert a tip tool of a crushing device such as a concrete breaker. More specifically, it is preferable that the size of the gap between the inner peripheral surface of the cylindrical block 13 and the outer peripheral surface of the cylindrical portion 12a is about 5 to 20 mm. Incidentally, in this embodiment, the diameter of the opening 13a is 180 mm, the outer diameter of the cylindrical portion 12a is 156 mm, and the gap between the inner peripheral surface of the cylindrical block 13 and the outer peripheral surface of the cylindrical portion 12a is 12 mm, and it is even more preferable that the size of the gap is about 10 to 15 mm.

Since the sand 14 filled up to the upper end of the cylindrical block 13 is filled without being stuck, the cylindrical portion 12a can be easily pulled out from the cylindrical block 13 without using a crushing device. Therefore, even if the size of the gap between the inner peripheral surface of the cylindrical block 13 and the outer peripheral surface of the cylindrical portion 12a is so small that the tip tool of a crushing device such as a concrete breaker cannot be inserted, the cylindrical portion 12a can be easily pulled out from the cylindrical block 13.
As mentioned above, the third mortar layer 15 located above the upper end of the cylindrical block needs to be removed when pulling out the cylindrical portion 12a from the cylindrical block 13, but this can be easily removed using a crushing device such as a concrete breaker.

In this embodiment, the cylindrical block 13 is rectangular, but the cylindrical block 13 is not limited to a rectangular shape and may be, for example, a circular, elliptical, trapezoidal, or polygonal shape. Similarly, the opening 13a is not limited to a circular shape and may be a rectangular or polygonal shape. Furthermore, the material of the cylindrical block 13 is not limited to concrete and may be resin concrete or cast iron.
In addition, although sand is used as the non-adhesive granules in this embodiment, the non-adhesive granules are not limited to sand, and other non-adhesive granules such as gravel, crushed stone, soil, iron particles, ceramic particles, etc. can also be used alone or in combination with sand.
In addition, in this embodiment, the third hardened layer is the mortar layer 15, but the third hardened layer is not limited to a mortar layer and may be, for example, a concrete layer.

In addition, in this embodiment, the upper end of the cylindrical block 13 and the upper end of the cylindrical portion 12a are at the same height, but the upper end of the cylindrical block 13 may be higher than the upper end of the cylindrical portion 12a, or may be lower.

Next, a method for installing the support device 10B will be described.
1, the construction method of this support device 10B includes, in addition to the construction method of the support device 10A described above, setting up a cylindrical block 13, filling the cylindrical block 13 with sand 14, which is a non-adhesive granular material, up to the upper end with the cylindrical portion 12a inserted in the cylindrical block 13, and arranging a third mortar layer 15, which is a third hardened layer, above the upper end of the cylindrical block 13. A more specific explanation is as follows.

First, as shown in FIG. 2, in the ground 30 containing the asphalt pavement 31 and the roadbed 32, the asphalt pavement 31 is removed by, for example, 300 mm square, and preliminary excavation is performed from the road surface (GL surface) by, for example, 300 mm square x 350 mm high, and the pile portion 11 including the tubular portion 12a is buried in the ground using a pile driver.

Next, about 10 mm of hard-mixed mortar which will become the fourth mortar layer (hardened layer) 16 is poured into the bottom portion where the preliminary excavation was performed, and then the cylindrical block 13 is placed on top of that so that the cylindrical portion 12a is inserted into the opening 13a of the cylindrical block 13.
After the dry mortar has hardened, sand 14 is filled into the gap between the cylindrical block 13 and the cylindrical portion 12 a up to the upper end of the cylindrical block 13 .

Next, the second mortar layer 12d is filled with dry mortar up to a position about +100 mm from the lower end (bottom 12e) of the cylindrical portion 12a, and the lower end of the leg 21 is inserted about 10 mm into the dry mortar to adjust the height of the above-ground structure. That is, in this embodiment, the second mortar layer 12d is placed between the lower end of the leg 21 and the lower end of the cylindrical portion 12a, and then the leg 21 is inserted into the cylindrical portion 12a.

After the second mortar layer 12d has hardened, sand 12b is filled into the gap between the cylindrical portion 12a and the leg portion 21 up to the top end of the cylindrical portion 12a.

Next, fill the preliminary excavation range (□300×h350 mm) with mortar and finish the surface with a metal trowel. In this way, the first mortar layer 12c, which is the first hardened layer, is disposed above the upper end of the cylindrical portion 12a, and the third mortar layer 15, which is the third hardened layer, is disposed above the upper end of the cylindrical block 13. In this embodiment, the first mortar layer 12c, which is the first hardened layer, is disposed above the upper end of the cylindrical portion 12a, and the third mortar layer 15, which is the third hardened layer, is disposed above the upper end of the cylindrical block 13 by filling the preliminary excavation range (□300×h350 mm) with mortar, so that the first mortar layer 12c and the third mortar layer 15 are integrated with the surrounding mortar layer 17 disposed around the cylindrical block 13, but in FIG. 2, the first mortar layer 12c, the third mortar layer 15, and the surrounding mortar layer 17 are virtually distinguished by dashed lines. The first mortar layer 12c, the third mortar layer 15 and the surrounding mortar layer 17 may be disposed (constructed) separately.
In addition, in this embodiment, the preliminary excavation range (□300×h350 mm) is filled with mortar, i.e., the first mortar layer 12c and the third mortar layer 15 are placed up to the same height as the road surface (GL surface), but this is not limited to this. For example, mortar may be filled up to a height slightly lower than the road surface (GL surface), and then backfill soil and asphalt pavement 31 may be placed above it.

When re-construction is to replace only the vehicle stop bollard 20, which is an above-ground structure, the first mortar layer 12c located above the top end of the cylindrical portion 12a is removed using a crushing device such as a concrete breaker, and the legs 21 are pulled out from the cylindrical portion 12a. The sand 12b inside the cylindrical portion 12a is then temporarily removed, and hard-mixed mortar is again filled in, and the legs 21 of the new vehicle stop bollard 20 are inserted into the cylindrical portion 12a. Next, as in the previous construction, the gap between the cylindrical portion 12a and the legs 21 is filled with sand 12b up to the top end of the cylindrical portion 12a, and then the first mortar layer 12c, which is the first hardened layer, is placed above the top end of the cylindrical portion 12a.

On the other hand, when replacing the entire support unit 12 including the cylindrical portion 12a, the first mortar layer 12c arranged above the upper end of the cylindrical portion 12a and the third mortar layer 15 arranged above the upper end of the cylindrical block 13 are removed using a crushing device such as a concrete breaker, and the cylindrical portion 12a is pulled out from the cylindrical block 13. After that, the sand 14 inside the cylindrical block 13 is temporarily removed, and the cylindrical portion 12a of the new support unit 12 is inserted into the cylindrical block 13. Next, as in the previous construction, the sand 14 is filled up to the upper end of the cylindrical block 13 in the gap between the cylindrical block 13 and the cylindrical portion 12a. Then, the first mortar layer 12c, which is the first hardened layer, is arranged above the upper end of the cylindrical portion 12a, and the third mortar layer 15, which is the third hardened layer, is arranged above the upper end of the cylindrical block 13. In addition, if the upper part of the surrounding mortar layer 17 is also removed when the first mortar layer 12c and the third mortar layer 15 are removed using a crushing device such as a concrete breaker, a mortar layer is also placed above the removed surrounding mortar layer 17 when placing the first mortar layer 12c and the third mortar layer 15.

In the above construction method, the cylindrical portion 12a of the support unit 12 including the pile portion 11 is installed, and then the cylindrical block 13 is installed. However, the cylindrical portion 12a of the support unit 12 including the pile portion 11 may be installed after the cylindrical block 13 is installed.

10A, 10B Support device 11 Pile portion 11a Middle portion 11b Tip portion 12 Support unit 12a Cylindrical portion 12a-1 Opening 12b Sand (non-adhesive granules)
12c First mortar layer (first hardened layer)
12d Second mortar layer (second hardened layer)
12e Bottom 12f Surrounding mortar layer 13 Cylindrical block 13a Opening 14 Sand (non-adherent granules)
15 Third mortar layer (third hardened layer)
16 Fourth mortar layer (fourth hardened layer)
17 Surrounding mortar layer 20 Vehicle stop bollard (ground structure)
21 Foot 22 Cap 30 Ground 31 Asphalt pavement 32 Roadbed

Claims (6)

A support device that supports legs of a ground structure while the legs are installed underground,
a support unit for supporting the leg;
The support unit includes:
A cylindrical portion having an opening limited in size to allow the leg portion to be inserted therein;
A bottom portion provided at a lower end of the cylindrical portion;
A stake portion attached directly or indirectly to the bottom portion;
With the leg portion inserted into the cylindrical portion, non-adhesive granules are filled into a gap between an inner peripheral surface of the cylindrical portion and an outer peripheral surface of the leg portion up to an upper end position of the inner peripheral surface of the cylindrical portion;
a first hardened layer disposed above the granules filled to the upper end position;
a supporting device having a peripheral hardened layer that is positioned relative to at least a portion of an excavated space formed above the lower end position of the cylindrical portion. A support device that supports legs of a ground structure while the legs are installed underground,
a support unit for supporting the leg;
The support unit includes:
A cylindrical portion having an opening limited in size to allow the leg portion to be inserted therein;
a first non-adhesive granule that fills a gap between an inner peripheral surface of the cylindrical portion and an outer peripheral surface of the leg portion up to an upper end position of the inner peripheral surface of the cylindrical portion when the leg portion is inserted into the cylindrical portion;
a first hardened layer disposed above the first granules filled to the upper end position;
The support device includes a cylindrical block having an opening limited in size to allow the cylindrical portion to be inserted therein;
a second non-adhesive granule that is filled into a gap between an inner peripheral surface of the cylindrical block and an outer peripheral surface of the cylindrical portion up to an upper end position of the inner peripheral surface of the cylindrical block when the cylindrical portion is inserted into the cylindrical block;
and a third hardening layer disposed above the second granules filled to the upper end position. The support device according to claim 1 or 2, wherein the support unit includes a second stiffening layer disposed between the lower end of the leg portion and the lower end of the tubular portion. A construction method for a support device that supports a leg of a ground structure while the leg is installed underground, comprising the steps of:
The support device includes a support unit that supports the leg portion, and the support unit includes a cylindrical portion , a bottom portion provided at a lower end of the cylindrical portion, and a stake portion directly or indirectly attached to the bottom portion ,
The construction method includes burying the pile portion in the ground;
Inserting the leg portion into the tubular portion;
filling a gap between an inner peripheral surface of the cylindrical portion and an outer peripheral surface of the leg portion with non-adhesive granules up to an upper end position of the inner peripheral surface of the cylindrical portion;
disposing a first hardened layer above the granules filled to the upper end position;
A construction method for a support device, comprising: placing a peripheral hardening layer on at least a portion of an excavated space formed above the lower end position of the cylindrical portion as a reference. A construction method for a support device that supports a leg of a ground structure while the leg is installed underground, comprising the steps of:
The support device includes a support unit that supports the leg portion, the support unit includes a cylindrical portion, and the support device further includes a cylindrical block into which the cylindrical portion can be inserted,
The construction method includes: installing the cylindrical portion and the cylindrical block so that the cylindrical portion is inserted into the cylindrical block;
filling a gap between an inner peripheral surface of the cylindrical block and an outer peripheral surface of the cylindrical portion with non-adhesive second granules up to an upper end position of the inner peripheral surface of the cylindrical block;
Inserting the leg portion into the tubular portion;
filling a gap between an inner peripheral surface of the cylindrical portion and an outer peripheral surface of the leg portion with non-adhesive first granules up to an upper end position of the inner peripheral surface of the cylindrical portion;
A method for constructing a support device, comprising: placing a first hardened layer above the first granules that have been filled to the upper end position; and placing a third hardened layer above the second granules that have been filled to the upper end position. The method of constructing a support device as described in claim 4 or claim 5, further comprising disposing a second hardening layer between the lower end of the leg and the lower end of the tubular portion before inserting the leg into the tubular portion.

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