JP7411958B2 - Pile support structure, pile unit, and their installation method - Google Patents

Description

The present invention relates to a pile support structure, a pile unit, a method for installing a pile support structure, and a method for installing a pile unit.

Generally, it is desirable to provide some kind of barrier at the boundary between the roadway and the sidewalk to prevent vehicles from accidentally entering the sidewalk. Such barriers may be provided by guardrails, poles, curbs, etc.

Patent Document 1 discloses an example of a car stop that can be installed at the boundary between a roadway and a sidewalk. The car stop disclosed in Patent Document 1 has a structure in which a foam is filled and foamed into an elastic strut outer skin.

Patent Document 2 discloses a car stop pole for preventing a vehicle from entering. The car stop pole disclosed in Patent Document 2 has a structure in which a core made of a flexible material is inserted into a hollow car stop pole made of cast iron.

Patent Document 3 discloses a safety bollard with energy absorption performance. In the safety bollard disclosed in Patent Document 3, a support 1 stands upright in the center of a recess provided in a concrete foundation (Patent Document 3: FIGS. 1 and 2). The recess has a tapered shape whose diameter decreases toward the bottom. In the recess, granular material such as sand is arranged around the pillar 1. An annular buffer 8 is provided around the support 1 near the ground surface.

Patent No. 4238800 specification JP 2001-140228 International Publication No. 02/090663

The bollard disclosed in Patent Document 1, the bollard pole disclosed in Patent Document 2, and the safety bollard disclosed in Patent Document 3 can all reduce the impact on the vehicle occupant when the vehicle is stopped. On the other hand, to cushion the impact, the car stoppers, car stopper poles, and pillars tilt significantly and intrude onto the sidewalk.

An object of the present invention is to provide a pile support structure, a pile unit, and a method for installing the same, which can stop the movement of a vehicle in a short distance while suppressing the impact on occupants in the vehicle.

According to the first aspect of the invention,
A pile support structure for erecting a pile on the ground surface,
a support part that is installed underground and supports the lower end of the pile;
and a resin buffer part that is destroyed when an impact is applied to the pile,
The support part has a cylindrical main body part surrounding the lower end of the pile, and a large diameter part that is provided on the upper end side of the main body part and has a larger diameter than the main body part,
The buffer portion is a cylindrical member disposed below the large diameter portion surrounding the main body portion, and the outer diameter of the buffer portion is constant throughout the entire axial direction, or A pile support structure is provided in which the outer diameter of the lower end of the buffer portion is larger than the outer diameter of the upper end of the buffer portion.

In the pile support structure of the first aspect, the buffer portion may have a truncated conical shape with an outer diameter increasing toward the lower end of the buffer portion.

In the pile support structure of the first aspect, the large diameter portion is configured such that when a load is applied to the pile, the pile support structure tilts about the outer peripheral portion of the large diameter portion as a fulcrum. You can.

In the pile support structure according to the first aspect, the large diameter portion includes a large diameter cylindrical portion having a larger diameter than the main body portion, and a large diameter cylindrical portion extending in the radial direction of the main body portion and the large diameter cylindrical portion. It may also include a rib that connects the large diameter cylindrical portion.

In the pile support structure of the first aspect, the rib may be a plurality of flat plate members, and the thickness direction of each of the plurality of flat plate members is in the circumferential direction of the main body. They may be arranged at equal intervals in the circumferential direction of the main body.

In the pile support structure of the first aspect, the rib may be a plurality of flat plate members, and the thickness direction of each of the plurality of flat plate members is in the axial direction of the main body. Two flat plate members adjacent in the circumferential direction among the plurality of flat plate members may be arranged at equal intervals in the circumferential direction of the main body so that one of the flat plate members is aligned in the axial direction of the large diameter cylindrical portion. and the other may be arranged at the other end in the axial direction of the large-diameter cylindrical portion.

In the pile support structure of the first aspect, the support portion may include a protective cover attached above the large diameter portion.

The pile support structure of the first aspect may include a fall-off prevention mechanism that restricts movement of the pile in the axial direction with respect to the support portion.

In the pile support structure of the first aspect, the outer diameter of the buffer portion may be smaller than the outer diameter of the large diameter portion.

According to the second aspect of the invention,
The pile support structure of the first aspect,
A foundation unit is provided that includes concrete that circumferentially surrounds and integrally fixes the support portion and the buffer portion of the pile support structure.

According to the third aspect of the invention,
The pile support structure of the first aspect,
and a pile supported by the pile support structure.

According to the fourth aspect of the invention,
The basic unit of the second aspect,
and a pile supported by the foundation unit.

According to the fifth aspect of the invention,
A method of installing a pile support structure for erecting a pile above the ground surface, the method comprising:
A support part that is installed in the ground and supports the lower end of the pile, the support part having a cylindrical body part surrounding the lower end part of the pile, and a support part that is provided on one end side of the main body part and has a diameter larger than that of the main body part. arranging a support portion having a large diameter portion in a formwork with the one end side facing downward;
The buffer portion is cylindrical, and the outer diameter of the buffer portion is constant over the entire area extending from one end side to the other end side in the axial direction, or the outer diameter of the one end side of the buffer portion is fixed. A buffer portion having an outer diameter larger than the other end is disposed above the large diameter portion so as to surround the main body so that the other end is above the one end;
Filling concrete around the support part and the buffer part in the formwork and hardening the concrete to form a foundation unit in which the main body part, the buffer part, and the concrete are integrated;
A method is provided that includes installing the foundation unit in the hole formed in the ground surface so that the one end side of the main body portion faces upward.

According to the sixth aspect of the invention,
A method of installing a pile unit, the method comprising:
installing a pile support structure by the method of the fifth aspect;
A method is provided that includes inserting a lower end portion of a pile into the body portion of the support portion of the pile support structure.

According to the pile support structure, the pile unit, and the installation method thereof of the present invention, it is possible to stop the movement of the vehicle within a short distance while suppressing the impact on the occupants in the vehicle.

FIG. 1 is an exploded perspective view of a pile unit according to an embodiment of the present invention. FIGS. 2(a) to 2(d) are explanatory diagrams showing the installation process of the pile unit. FIGS. 3(a) to 3(c) are explanatory diagrams for explaining the action of the pile unit when stopping the vehicle. FIG. 4 is a perspective view of a buffer section included in a pile unit according to a modification of the present invention. FIGS. 5(a) and 5(b) are explanatory diagrams for explaining the action of the modified pile unit when stopping the vehicle. FIG. 6(a) is a perspective view showing a modified example of the support portion. FIG. 6(b) is an axial view of the large diameter portion of the support portion of the modified example. FIG. 6(c) is a side view of a support portion of a modified example.

<Embodiment>
The pile unit 100 and the method of installing the pile unit 100 according to the embodiment of the present invention will be described using an example in which the pile unit 100 is installed between a roadway and a sidewalk.

[Structure of pile unit 100]
As shown in FIG. 1, the pile unit 100 has a structure in which a columnar pile 10, a substantially cylindrical support section 20, and a cylindrical buffer section 30 are coaxially combined.

Hereinafter, the direction in which the central axis A of the pile unit 100 extends will be referred to as the axial direction of the pile unit 10. Further, the circumferential direction and the radial direction around the central axis A are respectively referred to as the circumferential direction and the radial direction of the pile unit 10.

The pile 10 is a part that extends upward from the ground surface and forms a barrier between the roadway and the sidewalk. The pile 10 may be made of carbon steel, for example.

The pile 10 has a cylindrical shape centered on the central axis A. A hole 10h that penetrates the pile 10 in the radial direction is provided near the lower end 10b of the pile 10. A fall prevention pin P1 (described later) is inserted into the hole 10h.

The length of the pile 10 may be approximately 1300 mm to 1700 mm, for example. The diameter of the pile 10 may be approximately 100 mm to 200 mm, for example.

The support portion 20 is a portion that is buried underground and supports the pile 10. The support portion 20 is made of, for example, carbon steel, carbon fiber reinforced plastic (CFRP), or the like. As the carbon steel, for example, a general structural carbon steel pipe (STK) can be used.

The support portion 20 has a main body portion 21 extending in the axial direction, a large diameter portion 22 provided at an upper end 21t of the main body portion 21, and a protective cover 23 disposed on the upper surface of the large diameter portion 22.

The main body portion 21 is a cylindrical portion having a center hole 21A. In the installed state, a portion of the pile 10 near the lower end 10b is inserted into the center hole 21A. A pair of holes 21h1 extending in the radial direction are provided near the upper end 21t of the main body 21 so as to penetrate the main body 21 in the radial direction. A fall prevention pin P1 (described later) is inserted into the pair of holes 21h1. The pair of holes 21h1 are provided at positions overlapping the large diameter portion 22 (described later) in the axial direction.

A pair of holes 21h2 extending in the radial direction are provided near the center of the main body 21 in the axial direction so as to penetrate the main body 21 in the radial direction. Support pins P2 (FIGS. 1, 2(a) to 2(d)) are inserted and fixed into the pair of holes 21h2.

Although the length of the main body portion 21 is arbitrary, it may be approximately 600 mm to 900 mm, for example. The inner diameter of the main body part 21 should be set to a value slightly larger than the outer diameter of the pile 10 so that the outer circumferential surface of the pile 10 inserted into the main body part 21 and the inner circumferential surface of the main body part 21 come into contact with each other. is desirable. Thereby, rocking (wobbling) of the pile 10 can be suppressed.

The thickness of the main body portion 21 may be approximately 3 mm to 10 mm, for example.

The large diameter portion 22 is a portion that provides a pivot point for the pile unit 10 when an impact is applied to the pile 10. The large diameter portion 22 includes a large diameter cylindrical portion 221 and six ribs 222 .

The large diameter cylindrical portion 221 has a cylindrical shape centered on the central axis A.

The length of the large diameter cylindrical portion 221 may be approximately 1/6 to 1/10 of the length of the main body portion 21, for example. Further, the outer diameter of the large diameter cylindrical portion 221 may be approximately 300 mm to 400 mm, for example. The outer diameter of the large diameter cylindrical portion 221 may be approximately 1.5 to 4 times the outer diameter of the main body portion 21.

The six ribs 222 are portions that fix the large diameter cylindrical portion 221 to the main body portion 21 . Each of the six ribs 222 is a rectangular flat plate, and the thickness may be approximately 3 mm to 10 mm.

Each of the six ribs 222 is arranged such that the long side direction of the rib 222 coincides with the radial direction of the main body portion 21 and the large diameter cylindrical portion 221. Further, the six ribs 222 are arranged at equal intervals in the circumferential direction of the main body portion 21 and the large diameter cylindrical portion 221.

One short side of each of the six ribs 222 is fixed to the outer peripheral surface of the main body part 21 by welding, and the other short side is fixed to the inner peripheral surface of the large diameter cylindrical part 221 by welding.

The protective cover 23 is a member that covers the upper surface of the large diameter portion 22 in the installed state and prevents rainwater etc. from entering the support portion 20. The protective cover 23 is disc-shaped (annular, ring-shaped). The inner diameter of the cover 23 is equal to the inner diameter of the main body portion 21, and the outer diameter of the cover 23 is equal to the outer diameter of the large diameter cylindrical portion 221. The protective cover 23 may be made of metal or resin, for example.

The buffer portion 30 is buried around the main body portion 21 of the support portion 20 in the installed state, and is a portion that absorbs a portion of an impact when it is applied to the pile 10.

The buffer section 30 is made of, for example, a resin having buffer properties. Examples of resins having cushioning properties include styrofoam, urethane, and the like.

The buffer portion 30 is a cylindrical portion having a center hole 30A. In the installed state, the main body portion 21 of the support portion 20 is inserted into the center hole 30A.

In this embodiment, the length of the buffer portion 30 is the same as the length of the portion of the main body portion 21 that does not have the large diameter portion 22.

The inner diameter of the buffer section 30 is slightly larger than the outer diameter of the main body section 21 so that the outer circumferential surface of the main body section 21 of the support section 20 inserted into the center hole 30A and the inner circumferential surface of the buffer section 30 come into contact with each other. It is desirable to set a large value to

In this embodiment, the outer diameter of the buffer portion 30 is the same as the outer diameter of the large diameter cylindrical portion 221 of the large diameter portion 22 that the support portion 20 has. Further, the outer diameter of the buffer portion 30 is constant over the entire area of the buffer portion 30 in the axial direction. This makes it possible to easily manufacture the buffer section 30 and reduce manufacturing costs.

In addition, the support part 20 and the buffer part 30 of the pile unit 100 form the pile support structure of this embodiment.

[How to install pile unit 100]
The pile unit 100 is installed on the road as follows.

(1) Formation of basic unit BU First, the support portion 20 is placed inside the cylindrical formwork 500 with the large diameter portion 22 facing downward. The supporting part 20 is arranged so that the central axis A of the supporting part 20 coincides with the central axis of the formwork 500 (FIG. 2(a)).

Next, the buffer section 30 is arranged. The main body part 21 of the support part 20 is inserted into the center hole 30A of the buffer part 30 so that the entire area of the main body part 21 that does not have the large diameter part 22 is covered by the buffer part 30 (FIG. 2(a)). .

Thereafter, concrete C is poured into the formwork 500 and hardened so that the surroundings of the support part 20 and the buffer part 30 are filled with concrete C (FIG. 2(b)). As a result, a cylindrical base unit BU in which the support portion 20 and the buffer portion 30 are integrally solidified with concrete C is formed. In addition, you may consider that the pile unit is comprised by the pile 10 and the foundation unit BU.

(2) Installation on the road A cylindrical recess R is formed on the road at a position where the pile unit 100 is installed. Then, the basic unit BU taken out from the formwork 500 is placed inside the recess R. At this time, the basic unit BU is arranged so that the large diameter part 22 of the support part 20 is located on the upper side (on the ground side). Further, the base unit BU (the supporting section 20 and the buffer section 30) is arranged so that the central axis A thereof coincides with the central axis of the recess R (FIG. 2(c)).

Next, a portion of the stake 10 near the lower end 10b is inserted into the center hole 21A of the main body portion 21. The lower end 10b of the stake 10 contacts the support pin P2 of the main body portion 21 and is supported by the support pin P2. In this state, the hole 10h of the pile 10 and the pair of holes 21h1 of the main body portion 21 are aligned in the axial direction (FIG. 2(d)).

The support pin P2 is provided approximately at the center of the main body portion 21 having a length of approximately 700 mm to 900 mm. Therefore, a region of approximately 350 mm to 450 mm from the lower end 10b of the pile 10 is inserted into the center hole 21A of the main body portion 21. No stake 10 exists in the region below the support pin P2 in the center hole 21A of the main body portion 21. In this way, by providing the support pin P2 in the approximate center of the main body part 21 of the support part 20 to support the lower end 10b of the pile 10, the length of the pile 10 can be made to the minimum necessary, and as a result, the length of the pile The cost of the unit 100 can be reduced. Note that the support pin P2 may be omitted and the stake 10 may be inserted into the entire area of the main body portion 21.

Next, the fixing pin P1 is inserted so as to pass through the hole 10h of the stake 10 and the pair of holes 21h1 of the main body part 21. This prevents the pile 10 from being stolen, and even when a large impact is applied to the pile 10, the pile 10 is effectively prevented from falling off from the main body portion 21. A hole may be provided at the tip of the fixing pin P1, and a padlock may be hung there. Thereby, the fixing pin P1 is prevented from falling off from the hole 10h and the pair of holes 21h1, and the falling off of the pile 10 from the main body portion 21 is better prevented.

Thereafter, the protective cover 23 of the support part 20 is installed on the large diameter part 22. The protective cover 23 can be fixed to the large diameter portion 22 by, for example, welding if the protective cover 23 is made of metal, or by adhesive if the protective cover 23 is made of resin. This completes the installation of the pile unit 100. Note that the support portion 20 does not need to have the protective cover 23. Further, instead of or in addition to installing the protective cover 23, the inside of the large diameter portion 22 may be sprayed and filled with urethane resin or the like.

[Stopping the vehicle by the pile unit 100]
The pile unit 100 of this embodiment stops the movement of the vehicle within a short distance while suppressing the impact on the occupants in the vehicle as follows.

When a vehicle that has deviated from the roadway collides with the pile unit 100, a load F due to the collision is applied to the pile 10 that protrudes above the ground surface in a substantially horizontal direction from the roadway side to the sidewalk side (Fig. 3 (a)).

Here, the lower end portion 100b of the pile unit 100 is softer than the pile 10 and the support portion 20, and the support portion 20 is surrounded by a buffer portion 30 configured to absorb impact due to destruction. In addition, the pile unit 100 is provided with support in the horizontal direction on the side opposite to the side to which the load F is applied (that is, on the sidewalk side), and in the vertical direction between the part to which the load F is applied and the lower end 100b of the pile unit 100. A large diameter cylindrical portion 221 of the large diameter portion 22 of the portion 20 is in contact with the concrete C (hereinafter, this contact portion will be referred to as a support contact portion SC).

Therefore, the pile unit 100 receiving the load F pivots like a lever using the support contact portion SC as a fulcrum. That is, the pile 10 located above the support contact portion SC tilts toward the sidewalk, and the main body portion 21 of the support portion 20 located below the support contact portion SC tilts toward the roadway while destroying the buffer portion 30. (Figure 3(b)).

By pivoting as described above during a vehicle collision, the pile unit 100 uses a portion of the load F applied due to the vehicle collision to destroy the buffer portion 30 without applying it to the vehicle as a reaction force. Thereby, the impact applied to the vehicle when the vehicle is stopped by the pile unit 100 is suppressed.

Furthermore, by tilting the pile 10, part of the force that the vehicle tries to apply to the pile 10 can be released upward without being transmitted to the pile 10. That is, when the vehicle 10 rides on the side surface of the sloped pile 10, part of the kinetic energy of the vehicle is spent moving the vehicle upward without being applied as a load to the pile 10. This also suppresses the impact applied to the vehicle when the vehicle is stopped by the pile unit 100.

In addition, since the large diameter portion 22 is provided at the upper end 21t of the main body portion 21 and the support contact portion SC is defined near the ground surface, the pivot center X of the pile unit 100 is also located near the ground surface. . Therefore, the amount of movement of the pile 10 toward the sidewalk due to the pivoting of the pile unit 100 is different when the pile itself bends as in the case of the car stop disclosed in Patent Document 1 or the car stop pole disclosed in Patent Document 2, or when the pile itself bends as in the case of the car stop disclosed in Patent Document 1 or the car stop pole disclosed in Patent Document 3. This is smaller than when the center of pivot of the pillar is located at the lower end of the pillar as in the disclosed safety bollard.

If the impact of the collision cannot be sufficiently absorbed by destroying the buffer portion 30 and tilting the pile 10 alone, such as when the weight of the vehicle is large or the speed of the vehicle is high, the pile unit 10 may be further equipped with the following measures. to absorb shock.

If the buffer section 30 around the support section 20 is destroyed and the vehicle has not come to a stop even when the lower end of the support section 20 collides with concrete, the pile unit 100 destroys the large diameter section 22 and moves horizontally. (Fig. 3(c)). Due to this horizontal movement, the pile unit 100 uses a part of the load F applied by the collision of the vehicle to destroy the large diameter portion 22 without applying it to the vehicle as a reaction force.

In this way, when the pile unit 100 cannot sufficiently absorb the impact of a collision by only destroying the buffer section 30 and tilting the pile 10, the large diameter section 22 is destroyed and the pile unit 100 prevents the vehicle from moving when the vehicle is stopped. suppresses the impact applied to the In this case as well, the amount of horizontal movement of the pile unit 100 toward the sidewalk is not large because the impact is absorbed by the destruction of the large diameter portion 22.

The effects of the pile unit 100 of this embodiment are summarized below.

The pile unit 100 of this embodiment pivots like a lever when a vehicle collides with the pile 10, and absorbs part of the load applied to the pile 10 due to the collision without giving it to the vehicle as a reaction force. Used to destroy part 30. Therefore, the vehicle can be stopped while suppressing the impact on the occupants inside the vehicle.

In the support portion 20 of the pile unit 100 of this embodiment, a large diameter portion 22 is provided at the upper end 21t of the main body portion 21, and the pivot center of the pile unit 100 pivots when a vehicle collides with the pile 10. X is located near the earth's surface. Therefore, the amount of movement of the pile 10 due to the pivoting of the pile unit 100 is small, and the vehicle can be stopped in a short distance.

When the kinetic energy of the vehicle is large, the pile unit 100 of this embodiment destroys the large diameter portion 22 to absorb it. Therefore, even when the speed and weight of the vehicle are high, the vehicle can be stopped within a short distance while suppressing the impact on the occupants inside the vehicle.

The pile unit 100 of this embodiment separately includes a support portion 20 that can be destroyed when the vehicle is stopped, and a high-strength pile 10 made of carbon steel. Therefore, in the event of a vehicle collision, the support section 20 and the buffer section 30 can be replaced and the pile 10 can be reused.

The support pin P2 that the support part 20 of the pile unit 100 of this embodiment has can be used when removing the pile unit 100 from the road. That is, after removing the pile 10, the pile unit 100 can be easily removed by hooking the support pin P2 with a hook or the like and pulling it up with a crane or the like. Moreover, the buffer part 30 of the pile unit 100 of this embodiment also has the effect of facilitating the separation of the support part 20 and the concrete C when the pile unit 100 is removed, thereby facilitating the reuse of the support part 20.

<Modified example>
In the pile unit 100 of the above embodiment, the following modification may also be used.

In the pile unit 100 of the above embodiment, the outer diameter of the buffer portion 30 is equal to the outer diameter of the large diameter cylindrical portion 221 of the large diameter portion 22 of the support portion 20. However, the present invention is not limited to this, and the outer diameter of the buffer section 30 can be arbitrarily designed. The outer diameter of the buffer section 30 can be set, for example, so that the thickness of the buffer section 30 (that is, the value equivalent to one half of the difference between the outer diameter and the inner diameter) is about 10 mm to about 150 mm. . Generally, the larger the outer diameter of the buffer section 30 (the larger the thickness of the buffer section 30), the larger the amount of impact absorbed by the buffer section, and the smaller the impact applied to the vehicle when the vehicle is stopped.

On the other hand, by reducing the outer diameter of the buffer section 30, more concrete C will be used in the foundation unit BU, and the weight of the foundation unit BU will increase. By increasing the weight of the foundation unit BU, it is possible to prevent the foundation unit BU from shifting its position, which may occur when a shock greater than expected is applied to the pile unit 100.

In the pile unit 100 of the above embodiment, when a load of a size expected to be applied by a vehicle to be stopped is applied to the pile 10, the pile 10 does not tilt more than about 17 degrees from the vertical direction and the vehicle The dimensions and strength of each member, particularly the outer diameter of the large-diameter cylindrical portion 221 and the thickness of the buffer portion 30, may be set so that the stopping can be performed. By suppressing the inclination of the pile 10 to a range smaller than about 17°, the risk of a vehicle riding on and overcoming the pile 10 can be further reduced.

Further, instead of the buffer section 30, a buffer section 40 shown in FIG. 4 may be used. The buffer portion 40 is a cylindrical truncated cone having a center hole 40A extending in the axial direction and a tapered outer peripheral surface.

The inner diameter of the buffer section 40 is slightly larger than the outer diameter of the main body section 21 so that the outer circumferential surface of the main body section 21 of the support section 20 inserted into the center hole 40A and the inner circumferential surface of the buffer section 40 come into contact with each other. It is desirable to set a large value to The outer diameter of the buffer portion 40 is approximately the same as the outer diameter of the large diameter cylindrical portion 221 at the upper end 40t. The lower end 40b may have an arbitrary dimension larger than the outer diameter at the upper end 40t.

As shown in FIG. 5, by using the buffer section 40 with a large diameter near the lower end, when the pile unit 100 pivots due to a collision, the lower end 21b of the main body 21 of the holding section 20 The movable distance can be increased, and the amount of the buffer section 40 destroyed by the main body section 21 can be increased. As a result, the amount of impact absorbed by the buffer section increases, and the impact applied to the vehicle when the vehicle is stopped can be further reduced.

Note that, like the buffer section 50 shown in FIG. 5(b), a structure in which a small-diameter cylindrical buffer section 51 and a large-diameter cylindrical buffer section 52 arranged below the buffer section 51 are combined is used. It can also be used. Also in this case, the movable distance of the lower end portion 21b of the main body 21 of the holding portion 20 can be increased, and the amount of the buffer portion 50 destroyed by the main body 21 can be increased. As a result, the amount of impact absorbed by the buffer section increases, and the impact applied to the vehicle when the vehicle is stopped can be further reduced.

The pile 10 can be made of any shape and material. Specifically, it may be a square prism or a polygonal prism, for example. When the shape of the cross section perpendicular to the axial direction of the pile 10 is a square or polygon, the cross-sectional shape of the main body portion 21, large diameter portion 22, and buffer portion 30 of the support portion 20 shall also be the same as the cross-sectional shape of the pile 10. obtain.

The pile 10 can also be formed of carbon fiber reinforced plastic (CFRP) or the like instead of carbon steel.

In the pile unit 100 of the above embodiment, the large diameter portion 22 of the support portion 20 is configured by the large diameter cylindrical portion 221 and six ribs 222, but the present invention is not limited to this. Specifically, for example, the number of ribs 222 is not limited to six, but is arbitrary.

Instead of ribs 222 arranged so that the thickness direction of the ribs 222 is along the circumferential direction of the main body part 21 and the large diameter cylindrical part 221, ribs such as the ribs 222 are arranged so that the thickness direction of the ribs 222 is along the axial direction of the main body part 21. It is also possible to use ribs arranged in the same direction. Specifically, for example, as shown in FIGS. 6(a) to 6(c), three upper ribs 223t connect the large diameter cylindrical portion 221 and the main body portion 21 on the upper end 221t side of the large diameter cylindrical portion 221. The main body part 21 and the large diameter cylindrical part 221 may be connected by three lower ribs 223d that connect the large diameter cylindrical part 221 and the main body part 21 on the lower end 221d side of the large diameter cylindrical part 221. .

The three upper ribs 223t and the three lower ribs 223d are each fan-shaped (annular fan-shaped) flat plates, and are fixed to the main body part 21 at the small-diameter arc part and to the large-diameter cylindrical part 221 at the large-diameter arc part. ing.

The three upper ribs 223t and the three lower ribs 223d are arranged alternately in the circumferential direction (FIG. 6(b)).In addition, one of the two ribs adjacent in the circumferential direction is located in the large-diameter cylindrical portion 221. The upper rib 223t and the lower rib 223d are arranged so as to overlap in the circumferential direction. By arranging the large diameter cylindrical portion 221 on the upper end 221t side and the lower end 221d side in a well-balanced manner, the following effects can be obtained.In other words, the strength of the large diameter portion 21 can be made constant in the circumferential direction, and each Access to both sides of the ribs is facilitated, and welding or the like can be satisfactorily applied to both sides of each rib.

As shown in FIG. 6(c), each of the three upper ribs 223t is connected to the main body part 21 below the connection position to the large diameter cylindrical part 221, and each of the three lower ribs 223d is It is connected to the main body part 21 above the connection position to the diameter cylindrical part 221. In this way, by shifting the connection positions of the upper rib 223t and the lower rib 223d to the main body 21, the strength of the ribs can be increased.

Note that the numbers of the upper ribs 223t and the lower ribs 223d may be changed as appropriate. In addition, in this specification and the present invention, the expression "the direction of the plate thickness is along a predetermined direction" refers to the case where the direction of the plate thickness coincides with the predetermined direction and the direction of the plate thickness and the predetermined direction. This includes cases where the angle between the two directions is about 15° or less.

By adjusting the strength of the large diameter portion 22, the shock absorption performance of the pile unit 100 can be adjusted. In addition, the strength of the large diameter portion 22 is increased so that impact absorption when the speed or weight of the vehicle is large is achieved not by breaking the large diameter portion 22 but by destroying the concrete C around the large diameter portion 22. You can also.

In the pile unit 100 of the above embodiment, the large diameter portion 22 of the support portion 20 is provided at the upper end 21t of the main body portion 21, but the present invention is not limited to this. The large diameter portion 22 can be provided at any position closer to the upper end 21t than the vertical center of the main body portion 21. Note that the closer the large diameter portion 22 is to the upper end 21t, the smaller the amount of inclination (that is, the amount of horizontal movement) of the pile 10 when the vehicle is stopped.

In the embodiment described above, the fixing pin P1 is inserted so as to penetrate through the hole 10h of the stake 10 and the pair of holes 21h1 of the main body part 21 to prevent the stake 10 from falling off. However, the present invention is not limited to this. do not have.

Moreover, the pile unit 100 does not need to be provided with a structure that prevents the pile 10 from falling off.

In the installation method of the above embodiment, the basic unit BU is first formed and placed at the installation location, but the invention is not limited to this. A cylindrical hole may be formed at the installation location of the pile unit 100, the support portion 20 and the buffer portion 30 may be arranged inside the hole, and the concrete C may be poured into the hole.

In the above embodiment, the case where the pile unit 100 is installed between a roadway and a sidewalk for the purpose of preventing accidental intrusion of vehicles has been described as an example. However, the installation location and installation purpose of the pile unit 100 are arbitrary.

As long as the characteristics of the present invention are maintained, the present invention is not limited to the above embodiments, and other forms that can be considered within the scope of the technical idea of the present invention are also included within the scope of the present invention. .

According to the pile support structure, the pile unit, and the installation method thereof of the present invention, it is possible to stop the movement of the vehicle within a short distance while suppressing the impact on the occupants in the vehicle.

10 Pile 20 Support part 21 Main body part 22 Large diameter part 30, 40, 50 Buffer part 100 Pile unit 500 Formwork

Claims (14)

A pile support structure for erecting a pile on the ground surface,
a support part that is installed underground and supports the lower end of the pile;
and a resin buffer part that is destroyed when an impact is applied to the pile,
The support portion includes a cylindrical main body surrounding the lower end of the pile, and a large diameter portion that is fixed to the main body and has a larger diameter than the main body at the upper end of the main body. ,
The buffer portion is a cylindrical member disposed below the large diameter portion surrounding the main body portion, and the outer diameter of the buffer portion is constant throughout the entire axial direction, or The outer diameter of the lower end side of the buffer part is larger than the outer diameter of the upper end side of the buffer part,
The large diameter portion includes a large diameter cylindrical portion having a larger diameter than the main body portion, and a rib that extends in the radial direction of the main body portion and the large diameter cylindrical portion and connects the main body portion and the large diameter cylindrical portion. Pile support structures including . The pile support structure according to claim 1, wherein the buffer section has a truncated conical shape with an outer diameter increasing toward the lower end of the buffer section. The pile support according to claim 1 or 2, wherein the large diameter portion is configured such that when a load is applied to the pile, the pile support structure tilts using the outer peripheral portion of the large diameter portion as a fulcrum. Structure. The ribs are a plurality of flat plate members,
The plurality of flat plate members are arranged at equal intervals in the circumferential direction of the main body part such that the thickness direction of each of the plurality of flat plate members is along the circumferential direction of the main body part . The pile support structure according to any one of the items . The ribs are a plurality of flat plate members,
The plurality of flat plate members are arranged at equal intervals in the circumferential direction of the main body part so that the thickness direction of each of the plurality of flat plate members is along the axial direction of the main body part,
Of the plurality of flat plate members, one of the two circumferentially adjacent flat plate members is disposed at one end of the large-diameter cylindrical portion in the axial direction, and the other is disposed at the other end of the large-diameter cylindrical portion in the axial direction. Pile support structure according to any one of claims 1 to 3, which is arranged on the end side. A pile support structure for erecting a pile on the ground surface,
a support part that is installed underground and supports the lower end of the pile;
and a resin buffer part that is destroyed when an impact is applied to the pile,
The support part has a cylindrical main body part surrounding the lower end of the pile, and a large diameter part provided on the upper end side of the main body part and having a larger diameter than the main body part,
The buffer part is a cylindrical member disposed below the large diameter part to surround the main body part, and the outer diameter of the lower end side of the buffer part is larger than the outer diameter of the upper end side of the buffer part. big,
A pile support structure in which the buffer part has a truncated conical shape whose outer diameter increases toward the lower end of the buffer part.. The pile support structure according to any one of claims 1 to 6, wherein the support part has a protective cover attached above the large diameter part. The pile support structure according to any one of claims 1 to 7, further comprising a drop-off prevention mechanism that restricts movement of the pile in the axial direction with respect to the support portion. The pile support structure according to any one of claims 1 to 8, wherein the outer diameter of the buffer portion is smaller than the outer diameter of the large diameter portion. A pile support structure according to any one of claims 1 to 9,
A foundation unit comprising concrete that circumferentially surrounds and integrally fixes the support part and the buffer part of the pile support structure. A pile support structure according to any one of claims 1 to 9,
A pile unit comprising: a pile supported by the pile support structure. A basic unit according to claim 10,
a pile supported by the foundation unit. A method of installing a pile support structure for erecting a pile above the ground surface, the method comprising:
A support part that is installed in the ground and supports the lower end of the pile, the support part having a cylindrical body part surrounding the lower end part of the pile, and a support part that is provided on one end side of the main body part and has a diameter larger than that of the main body part. arranging a support portion having a large diameter portion in a formwork with the one end side facing downward;
The buffer portion is cylindrical, and the outer diameter of the buffer portion is constant over the entire area extending from one end side to the other end side in the axial direction, or the outer diameter of the one end side of the buffer portion is fixed. A buffer portion having an outer diameter larger than the other end is disposed above the large diameter portion so as to surround the main body so that the other end is above the one end;
Filling concrete around the support part and the buffer part in the formwork and hardening the concrete to form a foundation unit in which the main body part, the buffer part, and the concrete are integrated;
The method includes installing the foundation unit in the hole formed in the ground surface so that the one end side of the main body portion faces upward. A method of installing a pile unit, the method comprising:
Installing a pile support structure by the method according to claim 13;
A method comprising inserting a lower end portion of a pile into the body portion of the support portion of the pile support structure.

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