JP3897452B2 - Falling object suppression pile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fallen object suppression pile that can be used to receive fallen objects (for example, fallen rocks and snow masses) falling along an inclined land on the lower side of the slope and suppress the fall, and more specifically, embedded in a ground. The present invention relates to a fallen object suppression pile provided with a pile main body integrally formed with a part and a ground standing part that receives a fallen object falling along an inclined land on the inclined lower side and suppresses the fall.
[0002]
[Prior art]
In a conventional fallen object restraining pile, for example, as described in Japanese Patent Laid-Open No. 9-203036, the impact energy of a fallen object is directly generated by a pile body in which a buried part and a ground standing part are integrally formed. Absorbs and prevents falling objects from falling.
[0003]
[Problems to be solved by the invention]
Falling object restraint piles are often installed in places with poor workability, such as sloping ground, but the conventional fallen object restraining piles have a large plastic resistance moment so that they can absorb large impact energy. Since it is necessary to provide a heavy pile main body, there is a drawback that it takes time to carry in the falling work when installing a pile for preventing fallen objects.
[0004]
Moreover, when restoring a damaged fallen object suppression pile, it is necessary to replace the entire pile body, so not only the replacement pile body is carried in, but also the installation work and the damaged pile body is carried out. However, there is a drawback that it is troublesome and the restoration work cannot be performed efficiently.
[0005]
The present invention has been made in view of the above circumstances, and it is possible to absorb a large collision energy, and when installing a fall object restraining pile, it does not take time to carry it in, and the fallen fall object is damaged. The purpose is to make it possible to efficiently restore the restraint pile.
[0006]
[Means for Solving the Problems]
[Configuration 1]
The characteristic configuration of the fallen object suppression pile according to claim 1 is that the cylindrical body is externally fitted concentrically with a gap in the radial direction on the ground standing part of the pile body, and the ground standing part and the The air gap separating the cylindrical body is filled with a fluid substance that flows when a falling object collides .
[0007]
[Action / Effect]
That is, when the fallen object collides with the cylinder body fitted on the ground standing part, the fluid substance filled in the gap flows to relieve the impact force.
And the impact energy can be absorbed in the state which distribute | distributes the relieved impact force via a fluid substance, makes it act on a pile main body, and reduces a deformation | transformation of a pile main body.
In addition, since the gap is filled with a fluid substance, even if the cylindrical body is plastically deformed due to a collision with a falling object, the deformation part does not necessarily bite into the pile body and plastically deform to the pile body. .
[0008]
Furthermore, when installing piles for fallen object suppression, carry the pile body and the cylinder separately into the installation site, externally fit the cylinder to the ground standing part of the pile body, When restoring damaged piles for falling object suppression that can be filled with a fluid substance, depending on the degree of breakage, replace only the cylinder or the entire pile body, and if necessary The gap can be restored by filling it with a fluid substance.
[0009]
Therefore, since the collision energy can be absorbed in a state where the deformation of the pile body is reduced, the amount of collision energy absorbed can be substantially increased.
In addition, while securing the amount of collision energy absorbed, the pile body can be made lighter compared to the case where only the pile body absorbs the same amount of collision energy. In doing so, the pile main body, the cylinder, and the filling fluid substance can be carried in separately, so that the carrying-in work is less time-consuming than in the prior art.
[0010]
In addition, even if a fallen object collides with the cylinder and plastically deforms, it does not necessarily plastically deform to the pile body. When restoring a damaged fallen object suppression pile, only the cylinder is plastically deformed. Since the pile body can be used as it is, the restoration work can be performed more efficiently than before.
[0011]
[Configuration 2]
A characteristic configuration of the falling object suppression pile according to claim 2 is that the cylindrical body is provided with a cylindrical wall that is more easily plastically deformed than the pile main body.
[0012]
[Action / Effect]
That is, it is possible to positively plastically deform the cylindrical body that is externally fitted to the ground standing portion with the collision of the falling object.
Therefore, when the collision energy is relatively small, plastic deformation of the pile body can be avoided, and when restoring a damaged fallen object restraining pile, the cylinder should be replaced with good workability according to the degree of damage. Can do.
[0013]
[Configuration 3]
The characteristic structure of the pile for falling object suppression according to claim 3 is that the pile main body is configured by filling the inside of the cylindrical body with a curable substance.
[0014]
[Action / Effect]
Therefore, the amount of collision energy absorbed by the pile main body can be increased, and the curable substance can be filled at the installation site so that the carrying-in work does not take time.
[0015]
[Configuration 4]
The characteristic configuration of the pile for suppressing fallen objects according to claim 4 is characterized in that the buried portion of the pile main body is inserted inside the fixed cylinder body embedded and fixed in the ground with a gap in the radial direction, The air gap separating the fixed cylinder is filled with a fluid substance that flows when a falling object collides .
[0016]
[Action / Effect]
In other words, when a fallen object collides with a cylinder that is externally fitted to the standing standing part, the reaction force impacts the buried part, but the buried part has a gap inside the fixed cylinder that is embedded and fixed in the ground. Since the gap is filled with the fluid substance, the fluid substance filled in the gap between the buried portion and the fixed cylinder flows and the impact is mitigated.
[0017]
In addition, the reaction force whose impact is mitigated is likely to act in a state where the reaction force is distributed over substantially the entire fixed cylinder through the fluid substance, and collision energy is absorbed in a state where deformation of the fixed cylinder is reduced. The
[0018]
Therefore, collision energy can be absorbed with less deformation of the fixed cylinder, so when recovering a damaged fallen object restraining pile, the fixed cylinder that is embedded and fixed in the ground is reused. The recovery work can be performed efficiently in the state of positioning.
[Configuration 5]
The characteristic configuration of the pile for suppressing falling objects according to claim 5 is that the fluid substance is selected from sand, earth and sand, synthetic resin and rubber granules, and liquid.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 shows a state in which a rock fall prevention pile (hereinafter, simply referred to as a pile) P, which is an example of the fall object prevention pile of the present invention, is installed in the lower part of an inclined land K. 2, as shown in FIG. 3, a plurality of juxtapositions are provided side by side along the contour direction of the slope K, and a falling rock (an example of a fallen object) S falling along the slope K is received and dropped. It is configured to form a rock fall deterrent zone R to deter.
[0020]
The pile P includes a pile body 5 integrally formed with an embedded portion 2 embedded in the ground 1 and a ground standing portion 3 that receives the falling rock S falling along the inclined ground K on the inclined lower side and suppresses the falling. The pile main body 5 is configured by a steel pipe cylindrical body 5a.
[0021]
A steel pipe cylindrical body 6 having a diameter larger than that of the pile body 5 is externally fitted concentrically across the gap 4 in the radial direction across the ground standing part 3 and the buried part 2 of the pile body 5. A plurality of spacers 7 made of a substantially semicircular plate material so that the gap 4 can be formed substantially concentrically with the inner peripheral surface of the cylindrical body 6 at the upper and lower portions of the outer peripheral surface of the main body 5. The plate surface is welded and fixed along the vertical direction with an appropriate interval in the circumferential direction.
[0022]
As shown in FIG. 4, the spacer 7 is composed of a steel plate piece in which the spacer 7 is bent in a U-shape, and its lower bent portion 7a is welded and fixed to the pile body 5. Also good.
[0023]
The pile body 5 and the cylindrical body 6 include a mortar layer 8 filled with a thickness of about several centimeters to 10 cm at a lower end portion of the cylindrical body 6 and an upper mortar filled with an upper end portion of the gap 4 with a thickness of about several centimeters to 10 cm. The layers 9 are fixed to each other in a positioning state, and the gap 4 between the lower mortar layer 8 and the upper mortar layer 9 is filled with sand (an example of a fluid material having no adhesion) A.
[0024]
Moreover, the inner lower end portion of the pile body 5 is closed by the lower mortar layer 8, and the steel lid plate 10 provided with the hanging metal fitting 11 is welded and fixed to the upper end portion of the pile body 5. A hollow portion 12 in a sealed state is formed on the inside.
[0025]
The thickness or material of the cylindrical wall of the cylindrical body 6 is set so as to be more easily plastically deformed locally than the cylindrical wall of the pile body 5.
[0026]
Hereinafter, the installation procedure of the said pile P is demonstrated.
A lower mortar layer 8 is formed by inserting the lower part of the cylindrical body 6 into a hole excavated in the ground 1 at a predetermined depth and pouring the mortar into the cylindrical body 6 so as to have a thickness of several cm to 10 cm. Then, the buried body 2 side of the pile body 5 is inserted concentrically while being pushed into the uncured lower mortar layer 8.
[0027]
And after filling sand A to the space | gap 4 of the upper part rather than the lower mortar layer 8, the mortar is poured into the upper part of the sand A so that it may become a thickness of about several cm to 10 cm, and the upper mortar layer 9 is formed, The lid plate 10 is welded and fixed to the pile body 5 and the gap between the hole and the cylindrical body 6 is filled, and the installation operation is completed.
Here, the lid plate 10 may be fixed to the pile body 5 by welding in advance.
[0028]
[Second Embodiment]
5 and 6 show an embodiment in which the pile main body 5 is configured by filling the hollow portion 12 of the steel pipe cylindrical body 5a with concrete (an example of a curable substance) C. When P is installed, the buried portion 2 side of the cylindrical body 5a made of steel pipe is inserted into the uncured lower mortar layer 8 inside the cylindrical body 6 concentrically and then filled.
Other configurations and installation procedures are the same as those in the first embodiment.
[0029]
[Third Embodiment]
FIG. 7 shows that the embedded portion 2 of the pile body 5 shown in the first embodiment is inserted into the fixed cylindrical body 13 made of steel pipe embedded and fixed in the ground 1 together with the cylindrical body 6 with a gap in the radial direction. In this embodiment, the gap 14 separating the cylindrical body 6 and the fixed cylindrical body 13 is filled with sand (an example of a fluid material having no adhesion) B.
[0030]
Like the pile body 5, a plurality of gaps 14 can be formed substantially concentrically with the inner peripheral surface of the fixed cylindrical body 13 at the upper and lower portions of the outer peripheral surface corresponding to the lower portion of the cylindrical body 6. The spacers 15 are welded and fixed at appropriate intervals in the circumferential direction.
[0031]
The installation procedure of the pile P shown by this embodiment is demonstrated.
A fixed cylindrical body 13 is inserted into a hole excavated in the ground 1 at a predetermined depth, and a mortar is poured into the fixed cylindrical body 13 so as to have a thickness of several cm to 10 cm to form a lower mortar layer 8. The cylindrical body 6 is inserted concentrically with a gap 14 between the cylindrical body 6 and the fixed cylindrical body 13 with the lower portion pushed into the uncured lower mortar layer 8. It is inserted concentrically with the cylindrical body 6 with the side pushed into the uncured lower mortar layer 8.
[0032]
And after filling the space | gap 14 between the cylindrical body 6 and the fixed cylindrical body 13 with the sand B, the mortar 16 is poured into the upper part of the sand B so that it may become thickness of about several cm-10 cm, 1st Embodiment. In the same manner as described above, after the sand A is filled into the gap 4 above the lower mortar layer 8, the mortar is poured into the upper part of the sand A so as to have a thickness of about several centimeters to 10 cm. The lid plate 10 is welded and fixed to the pile body 5 and the gap between the hole and the fixed cylindrical body 13 is filled to complete the installation operation.
Here, the lid plate 10 may be fixed to the pile body 5 by welding in advance.
[0033]
Other configurations and installation procedures are the same as in the first embodiment, but as shown in the second embodiment, the hollow portion 12 of the pile body 5 is filled with concrete (an example of a curable substance) C. The pile body 5 may be reinforced.
[0034]
[Fourth Embodiment]
FIG. 8 shows an embodiment in which the cylindrical body 6 is fitted over the ground standing part 3 and a part of the burying part 2 of the pile body 5.
[0035]
And the burial part 2 of the pile main body 5 is inserted in the hole excavated in the ground 1, and the lower mortar layer 8 is formed by pouring the mortar so as to have a thickness of about several cm to 10 cm. After filling the gap with the body 5, a circumferential groove is excavated around the pile body 5 near the ground surface, and the cylindrical body 6 is the same with the lower part entering the circumferential groove with the gap 4 being separated from the pile body 5. After fitting externally in a core shape, filling the gap 4 corresponding to the space between the cylindrical body 6 and the embedded part 2 of the pile body 5 with the mortar 17, and then filling the upper gap 4 with sand A It is.
Other configurations and installation procedures are the same as those in the first embodiment.
[0036]
[Fifth Embodiment]
In FIG. 9, the cylindrical body 6 is externally fitted only on the ground standing part 3 side of the pile body 5 with the gap 4 in the radial direction, and the buried part 2 of the pile body 5 is the same as that shown in the third embodiment. An embodiment is shown in which sand B is filled in the gap 14 inserted between the pile body 5 and the fixed cylinder 13 inside the fixed cylinder 13 with a gap 14 therebetween in the radial direction. The fixed cylindrical body 13 is composed of a steel pipe having the same diameter and the same thickness, and is simply brought into contact without being connected to each other.
[0037]
Then, after the embedded portion 2 of the pile body 5 is inserted concentrically into the fixed cylindrical body 13 with the gap 14 therebetween, the lower part is pushed into the uncured lower mortar layer 8, and the gap 14 is filled with sand B The mortar 16 is poured into the upper part of the sand B so as to have a thickness of about several centimeters to 10 centimeters, and the cylindrical body 6 is externally fitted concentrically on the ground standing part 3 of the pile body 5 with the gap 4 interposed therebetween. At the same time, it is placed on the end face of the fixed cylindrical body 13 and the gap 4 is filled with sand A and installed.
Other configurations and installation procedures are the same as those in the first embodiment.
[0038]
[Other Embodiments]
<1> The fallen object suppression pile according to the present invention is not applied only when the fallen object is a fallen rock. For example, the fallen object is a snow lump and may be applied to prevent an avalanche. . In short, the present invention can be applied to a case where it is necessary to receive a fallen object falling along an inclined ground on the lower side of the slope and suppress the fall.
<2> The fallen object suppression pile according to the present invention may be one in which a plurality of cylindrical bodies having different diameters are externally fitted to the pile main body at intervals in the radial direction.
<3> As for the pile for fallen object suppression by this invention, the external appearance of the pile main body may be formed in the shape of a prism, or the cylinder body fitted on the pile main body may be formed in the shape of a square tube.
<4> The fallen object suppression pile according to the present invention may be one in which a cylinder is externally fitted to a pile body in a state where the cylinder axis is eccentric to the inclined upper side.
<5> The fluid that fills the gap separating the pile body and the cylinder and the gap separating the buried portion and the fixed cylinder is not limited to the sand shown in the above embodiment, and is generated when excavating the ground. It may be earth and sand such as excavated residual soil, granular material made of synthetic resin or rubber, liquid or the like.
<6> When a pile main body is configured by filling the cylinder with a curable substance, a curable substance such as resin concrete or asphalt may be filled.
In the claims, reference numerals are used for convenience of comparison with the drawings. However, the present invention is not limited to the configurations of the accompanying drawings.
[Brief description of the drawings]
[Fig. 1] Cross-sectional side view showing the fallen object suppression pile and its installation status [Fig.2] Partial cross-sectional top view showing the installation status of the fallen object suppression pile [Fig.3] Installation status of the fallen object suppression pile FIG. 4 is a cross-sectional side view of an essential part showing another embodiment of the spacer. FIG. 5 is a cross-sectional side view showing a fallen object restraining pile of the second embodiment. FIG. 7 is a cross-sectional side view showing the pile for preventing fallen objects of the third embodiment. FIG. 8 is a cross-sectional view showing the pile for falling object suppression of the fourth embodiment. FIG. 9 is a side sectional view showing a pile for suppressing fallen objects according to a fifth embodiment.
DESCRIPTION OF SYMBOLS 1 Ground 2 Buried part 3 Ground standing part 4 Cavity 5 Pile main body 5a Cylinder 6 Cylinder 13 Fixed cylinder 14 Cavity A Fluid substance B Fluid substance C Curable substance K Inclined land S Falling object

Claims (5)

The embedded part (2) embedded in the ground (1) and the ground standing part (3) that receives the fallen object (S) falling along the inclined ground (K) on the lower side of the slope and suppresses the fall are integrally formed. A pile for falling object suppression provided with the formed pile body (5),
On the ground standing part (3) of the pile body (5), the cylindrical body (6) is externally fitted concentrically with a gap (4) in the radial direction,
A fallen object restraining pile in which the gap (4) separating the upright standing part (3) and the cylindrical body (6) is filled with a fluid substance (A) that flows when a fallen object collides .   The pile for fallen object suppression of Claim 1 with which the said cylinder (6) is provided and provided with the cylinder wall which is easier to plastically deform than the said pile main body (5).   The pile for fallen object suppression of Claim 1 or 2 with which the said pile main body (5) is filled with the sclerosing | hardenable substance (C) inside the cylinder (5a). The embedded portion (2) of the pile body (5) is inserted inside the fixed cylinder (13) embedded and fixed in the ground (1) with a gap (14) in the radial direction,
The fluidity substance (B) which flows at the time of the collision of a fallen object is filled with the said space | gap (14) which separates the said embed | buried part (2) and the said fixed cylinder (13). The pile for fallen object suppression of 1 item | term. The pile for falling object suppression according to claim 1 or 4, wherein the fluid substance (A, B) is selected from sand, earth and sand, synthetic resin and rubber granules, and liquid.

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