JP3015858B2 - Construction structure of landslide prevention pile and its construction method. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction structure and a construction method of a landslide prevention pile on an inclined surface, and more particularly, to a method for driving a plurality of landslide prevention piles on an inclined surface and a vertical pile adjacent to the landslide prevention pile. Construction structure of a landslide prevention pile formed in a frame type truss shape by fixedly connecting with an inclined connection pile connecting the upper end and lower end to each other and a horizontal connection pile connecting the middle part of the vertical pile horizontally, and its Concerning the construction method.

[0002]

2. Description of the Related Art Conventionally, as a method of preventing a landslide of earth and sand formed by cutting and embankment or a landslide in a mountainous area, a method of placing a landslide prevention pile on an inclined surface is known. In this conventional method, a method is generally used in which individual landslide prevention piles are simply cast and heads of adjacent prevention piles are connected to each other to form a landslide prevention pile. For example, FIGS. 15 and 16 are a plan view and a sectional view showing a conventional example. As shown in FIG. 15, a steel pipe pile 31 cast on the ground has a head 32 of a steel pipe pile adjacent to the steel pipe pile 31. Concatenated,
The steel 33 is beaten with the steel material 32 as a core material and the concrete 34 is filled in the steel pipe pile 31 to form a landslide prevention pile.

[0003]

However, when the load of the earth and sand applied to the deterrent pile is large, only one end (head) of each deterrent pile (steel pipe pile) is connected. The deterrent piles individually oppose each other, cannot withstand a large load, and are not necessarily landslide deterrent piles having sufficient strength. As a result, landslides were to be prevented because the deterrent piles could not withstand the load for landslide suppression. The present invention has been made in view of the above circumstances, and provides a construction structure and a construction method of a landslide prevention pile capable of sufficiently resisting the earth pressure even when a large load of earth and sand is applied to the prevention pile. The purpose is to do so.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for driving a plurality of landslide prevention piles on an inclined surface, and connecting the heads of the landslide prevention piles to each other with a connecting member. In the construction structure of the landslide deterrent pile of the inclined surface that is fixed, the landslide deterrent pile is composed of a plurality of vertical piles driven into the ground, the lower end of one of the adjacent vertical piles and the other end of the other vertical pile. It consists of an inclined connection pile that firmly connects the upper ends with each other, and a horizontal connection pile that connects at least two places vertically in the middle of an adjacent vertical pile, and the landslide prevention pile is formed in a frame type truss shape. It is configured. The slope connection pile of the landslide prevention pile is formed of a steel pipe having a drill bit provided at the lower end thereof for drilling a vertical pile, and the bit is drilled at the lower part of the vertical pile to be attached to the vertical pile. The inclined connection pile of is formed of a steel pipe, a plurality of slits in the axial direction are provided on the lower peripheral surface,
The slit at the lower end is inserted into a hole formed in the lower part of the vertical pile, curved radially outward and attached to the vertical pile as a retaining part, and the inclined connection pile of the landslide prevention pile is formed of steel pipe. The lower end is a chamber containing a swelling agent that absorbs water and expands, and this chamber portion is inserted into the hole of the vertical pile, expanded with moisture and is attached to the vertical pile as a retaining portion, A connection hole is drilled in the side wall surface, the horizontal connection pile is configured to be fitted into the connection hole of an adjacent vertical pile and attached, and the horizontal connection pile of the landslide prevention pile is formed of a steel pipe, and the periphery of both ends thereof is formed. A plurality of slits in the axial direction are provided on the side surface, and the slits at both ends are fitted into the connection holes of the adjacent vertical piles, bent outward in the radial direction, and attached to the vertical piles as stoppers, the landslide. The horizontal connection pile of the deterrent pile is made of steel pipe, The end is a chamber containing a swelling agent that absorbs water and expands, and the both ends of this chamber are fitted into the connection holes of the adjacent vertical pile, expanded with moisture and made as retaining parts, and attached to the vertical pile, The horizontal connection pile of the landslide prevention pile has a configuration in which a flexible steel wire material is used as a core material as an embodiment.

The present invention also provides a landslide prevention pile having an inclined surface, in which a plurality of landslide prevention piles are cast on an inclined surface, and the heads of the landslide prevention piles are connected and fixed to each other by a connecting member. Landslide deterrent piles, a plurality of vertical piles laid in the ground, a plurality of inclined connection piles fixedly connecting the lower end of one vertical pile and the upper end of the other vertical pile of adjacent vertical piles to each other A method of constructing a landslide prevention pile comprising a plurality of horizontal connection piles horizontally connecting at least two upper and lower portions of a middle part of an adjacent vertical pile, and forming the landslide prevention pile into a frame type truss shape, The configuration is characterized by a process. (1) The vertical pile is provided with a connection hole at the corresponding position for connecting the horizontal connection pile, and the hole is a steel pipe closed with a cover,
A step of drilling a vertical hole in an appropriate place on the ground and inserting the vertical pile. (2) A step of filling a fixing agent between the outside of the inserted vertical pile and the wall surface of the vertical hole. (3) For the adjacent vertical piles that have been cast, penetrate the cover from the connection hole of one of the vertical piles to the connection hole of the other vertical pile, insert the horizontal connection pile, and insert the adjacent vertical pile. The process of connecting with horizontal connecting piles. (4) The inclined connection pile is a steel pipe having a drill bit at the tip, and drills holes from the vicinity of the head of one of the vertical piles to the bottom of the other vertical pile of the installed vertical pile to form the inclined connection. The process of inserting a stake. (5) A step of piercing the lower end of the vertical pile using the drill bit at the tip of the inclined connection pile, and fitting the tip of the inclined connection pile into the lower end of the vertical pile. (6) A step of injecting a fixing material from the inside of the vertical pile and filling the fixing agent into the inside of the vertical pile and the horizontal connection hole. (7) fixing the upper part of the inclined connection pile and the upper part of the vertical pile. (8) A step of filling a fixing agent between the inside of the inclined connecting pile and the outside of the inclined connecting pile and the hole wall surface. And the inclined connecting pile is a steel pipe having a perforated bit at the tip, a means for embedding by a double pipe excavation method using the inclined connecting pile as an outer pipe, and a drilling rod having a drilled bit at the tip as an inner pipe, The horizontal connection pile is made of steel wire material having a stopper fixed to one end, and is connected to an excavator to break a cover from a connection hole of one vertical pile and excavate a horizontal hole, and to a connection hole of the other vertical pile. The wire is pulled out by inserting and collecting the excavator from inside the other vertical pile, a stopper that does not come off from the connection hole is fixed to one end of the wire, and the adjacent vertical pile is tightened by pulling from the other end. Means to fill the inside of the vertical pile and the horizontal holes with adhesive thereafter,
Is adopted as an embodiment.

[0006]

[Function] The landslide prevention pile is a frame type truss in which the lower and upper ends of adjacent vertical piles are fixedly connected by inclined connection piles, and the middle part of vertical piles is also fixedly connected horizontally by horizontal connection piles. Because of the shape of the landslide prevention pile, even when a large load that cannot be sustained by individual deterrent piles is applied to the landslide deterrent pile, the load on the deterrent pile is dispersed, and the load on each individual deterrent pile is reduced, and even a large load is applied. Can withstand enough. Therefore, even in a dangerous area where the landslide ground is deep, it can sufficiently withstand the earth pressure, and the collapse of the ground can be prevented.

Further, according to the construction method of the present invention, the construction structure of the landslide prevention pile can be easily constructed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a landslide prevention pile according to the present invention, and FIG. 2 is a longitudinal sectional view of the landslide prevention pile. The landslide prevention pile 1 has a plurality of vertical piles 2 installed on the ground and adjacent vertical piles 2, 2. A frame connecting the inclined connection pile 3 for firmly connecting the upper end of one vertical pile 2 and the lower end of the other vertical pile 2 and the horizontal connection pile 4 for connecting the middle part of the vertical piles 2 and 2 horizontally. It is composed of a truss shape. The heads of the vertical piles 2 are also connected by a connecting member 5, but this is the same as in the conventional example, and the description is omitted below.

The vertical pile 2 and the inclined connection pile 3 use steel pipe piles. The upper end of the inclined connection pile 3 is welded 6 to the upper end of the vertical pile 2 as shown in FIG. As shown in FIG. The lower end of the inclined connection pile 3 is inserted into the lower end of the vertical pile 2 into a side wall hole 8 formed in the vertical pile 2 as shown in FIG.
Means for injecting and fixing, the inclined connecting pile 3 as shown in FIG.
A plurality of slits 10 in the axial direction are provided on the peripheral side of the lower end of the vertical stake. The slits 10 are inserted into the side wall holes 8 pierced at the lower end of the vertical pile 2 and then bent outward in the radial direction to form a retaining portion. A chamber 11 containing an inflating agent 12 such as a static crushing agent, which absorbs moisture and expands, is provided at a lower end of the inclined connecting pile 3 as shown in FIG. The lower end provided with the chamber 11 is inserted into a side wall hole 8 drilled in the lower end of the vertical pile 2 and then expanded with water to form a retaining portion. Then, a fixing agent 9 is injected and fixed. Is done.

As shown in FIG. 8, a wire 14 serving as a core material is inserted into a connection hole 13 formed in the vertical pile 2, and a stopper 15 is fixed to one end of this wire. Vertical piles 2, 2 adjacent by pulling from the end
Means for filling and firmly connecting the vertical pile 2 and the horizontal hole 16 with the adhesive 17 in the vertical pile 2 and the horizontal coupling pile 4 as shown in FIG.
A plurality of slits 18 in the axial direction are provided on the peripheral side surfaces at both ends of the vertical pile 2, and the slits 18 at both ends are fitted into the connection holes 13 of the vertical pile 2, and then bent outward in the radial direction to form a retaining portion.
A chamber 19 is provided at both ends of the horizontal connecting pile 4 for containing an expanding agent 20 that absorbs water and expands, as shown in FIG. After being fitted into the connection hole 13 of the vertical pile 2, it is expanded by moisture and fixedly connected by means for forming a retaining portion. Further, although the details will be described later, the vertical pile 2 and the inclined connection pile 3 are firstly excavated in the vertical holes 21 and the inclined holes 22 by a boring device (not shown), and then the vertical pile 2 and the inclined The inclined connecting pile 3 may be inserted and buried, or the vertical pile 2 and the inclined connecting pile 3 may be inserted.
May be buried by a double pipe excavation method with an outer pipe. The outside and inside of the vertical pile 2 and the outside and inside of the inclined connection pile 3 are filled with a bonding agent 17. This fixing agent 17 is
It is an adhesive to the ground of piles 2 and 4, and cement milk,
Mortar or the like is used. As the fixing agent 9 between the vertical pile 2 and the inclined connection pile 3, cement milk, mortar, a polymer solution or the like is used.

However, since the landslide prevention pile 1 is formed in a frame type truss shape by the vertical pile 2, the inclined connection pile 3 and the horizontal connection pile 4, the load applied to the prevention pile is dispersed, and each vertical The load applied to the pile 2 is reduced, and the pile 2 can sufficiently withstand a large load.

Next, a method of constructing the landslide prevention pile 1 will be described with reference to FIGS. First, calculate the required number of vertical piles 2 from the ground strength of the landslide prevention area to be constructed, and determine how many vertical piles 2 to bury and how many inclined connection piles 3 to bury. I do. Then, an excavation plan considering the arrangement of the vertical holes 21 and the like is made based on the planned number of the vertical piles 2 to be buried, and at the same time, which vertical piles 2 are to be connected in the horizontal direction and which vertical piles 2 are to be connected in a trust form are examined in advance. Is added, the excavation plan for all the pile holes 21, 22, and 16 is determined. Next, based on the excavation plan, a boring device (not shown) is installed at the site where the landslide prevention pile 1 is to be driven, and the vertical holes 21 are firstly excavated as shown in FIG. As a method of excavating the vertical hole 21, there is a conventional large-diameter boring method. In this case, after all the vertical holes 21 are excavated, the process may proceed to excavation of the inclined holes 22 and the horizontal holes 16,
After excavating some of the vertical holes 21, the operation may be shifted to the excavation of the inclined holes 22, and the construction order may be appropriately determined according to the conditions of the site and the like. The digging depth of the vertical hole 21, determined by the initial drilling plan, but for example through the ground G ₁ and ground G ₂ shown in FIG. 2, drilled to bore depth of ground G ₂ is equal to or greater than at least 5m I do. Wherein the ground G ₁ represents a landslide dangerous soft ground, ground G ₂ is illustrates a hard ground without risk of landslides. The hole depth of the vertical hole 21 is about 30 m, but this depth varies depending on the situation at the site.

In this embodiment, a plurality of vertical holes 21 are excavated,
Next, the case where the horizontal hole 16 is excavated and the inclined hole 22 is excavated will be described. When the excavation of two adjacent vertical holes 21 is completed based on the excavation plan, the vertical pile 2 is buried in the vertical holes 21, and the horizontal holes 16 connecting the middle portions of the two vertical holes 21 are formed at least. One drills near the bottom of the vertical hole, and the other horizontal hole 16 drills above it. Then, an inclined hole 22 connecting the head of one vertical hole 21 and the bottom of the other vertical hole 21 is excavated.

For excavation of the vertical hole 21, conventionally known means, for example, a large-diameter boring method is employed. For excavation of the horizontal hole 16 and the inclined hole 22, conventionally known means, for example, a rotary Double pipe drilling method using a percussion drill, ODEX method suitable for excavation in relatively soft ground in overburden, Grundmart method, auger device for forming horizontal holes (Japanese Patent Laid-Open No. 52-1512)
No. 14), water jet drilling method
210396) and SST method (Japanese Patent Publication No. 62-272)
No. 38).

For example, the horizontal hole 16 is provided with a horizontal base (not shown) at an excavation start point in the middle of one of the adjacent vertical holes 21.
Is set on the base, and the excavator is excavated from the ground surface while controlling the excavator. Alternatively, at both ends in the horizontal direction of the landslide prevention area, first, two large-diameter pits in which a horizontal excavator can be installed were excavated, and the pits were aligned between the pits by the above-described lateral hole forming auger apparatus and the SST method. A method of excavating while vertically penetrating the vertical hole 21 (vertical pile 2) in a skewered manner can also be adopted. In any case, these vertical holes 21, horizontal holes 16 and inclined holes 2
In excavation 2, the excavation method suitable for the site may be adopted.

When the excavation of the adjacent vertical hole 21 according to the excavation plan is completed in this way, the vertical pile 2 is erected in the vertical hole 21 as shown in FIG. The horizontal connection pile 4 is connected to the middle of the vertically piled adjacent vertical piles 2, 2, and the horizontal connection pile 4 needs to be provided at least near the lower end of the vertical pile 2 and in the middle part. A connection hole 13 is previously formed at a side position of the vertical pile 2 where the horizontal connection pile 4 is connected, and the connection hole 13 is closed from the outside by a plastic cover 23 (FIG. 12). And
When the vertical piles 2 are buried to a predetermined depth while being successively added by welding or the like, as shown in FIG. 12, the connection holes 13 of the adjacent vertical piles 2 are buried so as to face each other. Then, the adhesive 17 is filled between the outside of the vertical pile 2 and the vertical hole 21 (FIG. 13).

Next, the cover 23 is torn from the connection hole 13 of the one vertical pile 2 and a horizontal hole 16 to be inserted into the connection hole 13 of the other vertical pile 2 is excavated. For excavation of the horizontal hole 16, a conventionally known water jet excavator or a Grundmart excavator is used. When excavating the horizontal hole 16, one end of a flexible steel wire 14, for example, which is a core material of the horizontal connection pile 4, is connected to the rear of the excavator,
The wire 14 is pulled out by collecting the excavator from the other vertical pile 2 to form a connecting core for the adjacent vertical piles 2 (FIG. 14). In this case, as shown in FIG.
By adhering the 5 and pulling it from the other end, the adjacent vertical piles 2 can be tightened. Then, the adhering agent 17 flows into the inside of the vertical pile 2 until the adjacent vertical piles 2 and 2 are tightened and the horizontal hole 16 is buried. This fixing agent 17
Flows until the horizontal hole 16 is sufficiently filled.
The inflow time of the adhesive 17 is determined in consideration of the connection of the inclined connection pile 3. In the above manner, the plurality of vertical piles 2 are connected to each other by the horizontal connection pile 4.

[0018] Incidentally, was taken method Tatekomu immediately vertical pile 2 after drilling vertical holes 21, the ground G ₁ is the soft ground, but the vertical hole 21 is to prevent the collapse, the collapse If there is no concern, the vertical pile 2 and the horizontal connection pile 4 may be formed after excavation of the vertical hole 21 and the horizontal hole 16.

Next, the excavation of the inclined hole 21 and the laying of the inclined connecting pile 3 will be described. From the vicinity of the opening of one vertical hole 21 of the adjacent vertical piles 2, the vertical holes provided in the other vertical hole 21 are arranged. An inclined hole 22 is excavated toward the bottom of the pile 2. This inclined hole 22 is excavated by the method described above, for example, the double pipe excavation method and the ODEX method. According to this excavation, the inclined connection pile 3 can be buried simultaneously with the drilling. For example, an excavator using the ODEX method is installed in the vicinity of the opening of the vertical hole 21 at which excavation is started, and as shown in FIG. When excavation is carried out in the pile 3 with a drilling rod provided with a drilling bit at the tip, the drilling bit of the drilling rod serving as the inner pipe projects from the tip of the outer pipe as the inclined connection pile 3 and rotates eccentrically to rotate the outer pipe. The inclined connection pile 3 is sequentially inserted by welding or the like while being added, and is installed simultaneously with the excavation. When the drilling rod as the inner pipe is rotated in the reverse direction, the diameter of the drilling bit is reduced, so that the drilling bit can be pulled into the outer pipe that is the inclined connection pile 3, and the drilling rod can be removed. In this manner, the inclined connection pile 3 serving as the outer pipe is
When it comes into contact with the lower end of the pipe, pull out the drilling rod that is the inner pipe,
Perforated bit 2 fixed to the tip of the outer tube that becomes the inclined connection pile 3
6 pierces the vertical pile 2. Therefore, the vertical pile 2 is previously fixed with a bonding agent 17 such as cement milk or mortar.
It is preferable that the outside of the hole is solidified so as to sufficiently withstand the drilling impact of the drill bit 26.

The lower end of the vertical stake 2 is pierced 8 with the piercing bit 26, and when the tip of the inclined connecting stake 3 is inserted into the hole 8 as shown in FIG. , A mortar, a polymer solution or the like. Since the adhesive 9 flows between the teeth of the drill bit 26 and between the teeth and the water channel and flows out from the inside of the inclined connection pile 3 to the outer peripheral side face, the filling agent 9 is filled until the inner and outer peripheral side faces of the inclined connection pile 3 are filled. .

In the ODEX method of the above embodiment, another connecting steel pipe which can be inserted into the outer pipe can be used as the inclined connecting pile 3. That is, after the drilling rod drills a hole in the vertical pile 2, the drilling rod is pulled out, a connecting steel pipe which becomes the inclined connecting pile 3 having a smaller diameter than the outer pipe is inserted, and then the outer pipe is pulled out. Vertical pile 2 and inclined connection pile 3
Is connected and fixed. In this case, it is preferable to provide a flange at the end of the connection steel pipe that becomes the inclined connection pile 3 because the flange is prevented from coming off.

Further, as another embodiment, as shown in FIG. 6, an inclined connecting pile 3 provided with a plurality of slits 10 at the lower end of the inclined connecting pile 3 can be used. That is, in the inclined connection pile 3, a steel ring piece 24 in which a screw hole 25 is screwed in the axial direction of the inclined connection pile 3 is welded to the bottom of the inclined connection pile 3, and extends from the steel ring piece 24 to the peripheral side surface. An index member which is provided with a plurality of slits 10 in the axial direction, one end of which is screwed into the screw hole 25, and the other end of which is inserted through the inside of the inclined connection pile 3 and can be indexed from above the inclined connection pile 3; For example, an index rod 27 is provided. After inserting the lower end of the inclined connection pile 3 into the side wall hole 8 of the vertical pile 2 and indexing the index rod 27 upward, the slit 10 is bent outward in the radial direction. Then, a retaining portion is formed, and a fixing agent is poured and fixedly connected (FIG. 6). In this embodiment, in the first embedding of the vertical pile 2, the fixing agent 17 is poured only into the outer peripheral side of the vertical pile 2, the inside of the vertical pile 2 is hollowed, and the adhesive 17 is poured after connecting the inclined connection pile 3. Becomes In this case, if the screw hole 25 is screwed into a screw for adding the index rod 27 and a reverse screw, the index rod 27 is indexed and the slit 10 is bent to form a retaining portion. This can be recovered by unscrewing 27.

As still another embodiment, as shown in FIG. 7, the lower end of the inclined connecting pile 3 is provided with a chamber containing an expanding agent 12, such as a static crushing agent, which expands by absorbing moisture. 11 and the chamber 11 is formed in the side wall hole 8 at the lower end of the vertical pile 2.
If the expansion agent 12 absorbs moisture and expands, the lower end of the inclined connection pile 3 expands outward in the outer diameter direction to form a retaining portion.

Further, the slit 1 of the inclined connection pile 3
The method of forming the retaining portion by providing 0 and the method of forming the retaining portion by using the expanding agent 12 can also be adopted for the fixed connection of the horizontal connection pile 4 to the vertical pile 2 (FIGS. 9 and 10). In this case, for example, as a horizontal connection pile 4 as a steel bar or a steel pipe,
A method is used in which a vertical hole 21 excavated to a large diameter is inserted while being added by a horizontal excavator.

According to the construction procedure by repeating the above operation, the connection portions of the vertical pile 2, the inclined connection pile 3, and the horizontal connection pile 4 are each frame-type truss-type landslide restraint in which the respective connection portions are firmly fixedly connected to each other. The pile 1 can be constructed at a predetermined position in the landslide prevention area.

In the above embodiment, the case where the steel pipe pile is used as the vertical pile 2 has been described. However, the present invention is not limited to the steel pipe pile.
Shaped steel, I-shaped steel, etc. can also be used. Further, the inclined connection pile 3 is not limited to a steel pipe, but may be any as long as it can be connected and fixed to the vertical pile 3. The connection portion can be appropriately designed and changed by welding or another fixing method.

[0027]

As described above, a plurality of landslide prevention piles are cast on an inclined surface, and the heads of the landslide prevention piles are fixedly connected to each other by a connecting member. The lower end of one vertical pile and the upper end of the other vertical pile of the vertical pile are fixedly connected by an inclined connection pile and fixedly connected in a frame type truss shape, and the middle part is fixedly connected horizontally by a horizontal connection pile. As a result, the landslide prevention pile as a whole can be made stronger and more steely, and the load applied to each vertical pile is dispersed, the load applied to each vertical pile is reduced, and the load capacity is greatly reduced. Can be enhanced. As a result, since a thin steel material can receive a large load of earth pressure, it is possible to greatly reduce the construction unit price, and it is economical. Moreover, according to the construction method according to the present invention, the landslide prevention pile according to the present invention can be easily constructed.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a connection example of the head of the vertical pile and the inclined connection pile.

FIG. 4 is a partial cross-sectional view showing another example of connection of the heads of the vertical pile and the inclined connection pile.

FIG. 5 is a partially enlarged cross-sectional view showing a connection example of a lower end portion of a vertical pile and an inclined connection pile.

FIG. 6 is a partially enlarged cross-sectional view showing another example of the lower end of the vertical pile and the inclined connection pile.

FIG. 7 is a partially enlarged cross-sectional view showing still another example of connection of the lower ends of the vertical pile and the inclined connection pile.

FIG. 8 is an enlarged sectional explanatory view showing an example of connection between a vertical pile and a horizontal connection pile.

FIG. 9 is a partial cross-sectional explanatory view showing another connection example of the vertical pile and the horizontal connection pile.

FIG. 10 is a partial cross-sectional explanatory view showing still another example of connection between a vertical pile and a horizontal connection pile.

FIG. 11 is an explanatory sectional view showing steps of a construction method according to the present invention.

FIG. 12 is an enlarged sectional explanatory view showing a next step.

FIG. 13 is an enlarged cross-sectional explanatory view showing the next step.

FIG. 14 is an enlarged cross-sectional explanatory view showing the next step.

FIG. 15 is a plan view showing a conventional example.

FIG. 16 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Landslide prevention pile 2 Vertical pile 3 Inclined connection pile 8 Side wall hole 9 Adhesive agent 10, 18 Slit 11, 19 Room 12, 20 Expanding agent 13 Connection hole 14 Wire 16 Horizontal hole 17 Adhesive 21 Vertical hole 22 Inclined hole

Claims (11)

(57) [Claims] 1. A construction structure for a landslide prevention pile having an inclined surface, wherein a plurality of landslide prevention piles are cast on an inclined surface, and heads of the landslide prevention pile are connected and fixed to each other by a connecting member. The deterrent piles are a plurality of vertical piles cast on the ground, and the inclined connection piles that fix and connect the lower end of one vertical pile and the upper end of the other vertical pile adjacent to each other, A construction structure for a landslide prevention pile, comprising a horizontal connection pile that horizontally connects at least two upper and lower portions of a vertical pile midway, and the landslide prevention pile is formed in a frame type truss shape. 2. The inclined connection pile of the landslide prevention pile is formed of a steel pipe having a drill bit at the lower end thereof for drilling a vertical pile, and the drill bit is drilled at a lower portion of the vertical pile to be attached to the vertical pile. The construction structure of the landslide prevention pile according to claim 1, characterized in that: 3. The sloping connection pile of the landslide prevention pile is formed of a steel pipe, and a plurality of axial slits are provided on a peripheral side surface of a lower end thereof. The landslide prevention pile construction structure according to claim 1, wherein the landslide prevention pile is fitted to a vertical hole by being fitted into the hole formed and curved radially outward to form a retaining portion. 4. The slope connection pile of the landslide prevention pile is formed of a steel pipe, and a lower end thereof is a chamber containing an expanding agent that absorbs moisture and expands, and this chamber portion is inserted into a hole of the vertical pile. 2. The construction structure for a landslide prevention pile according to claim 1, wherein the pile is prevented from being expanded by moisture and is attached to a vertical pile. 5. The landslide prevention device according to claim 1, wherein a connection hole is formed in a side wall surface of the vertical pile, and a horizontal connection pile is fitted and attached to the connection hole of an adjacent vertical pile. Construction structure of pile. 6. The horizontal connection pile of the landslide prevention pile is formed of a steel pipe, and a plurality of slits in the axial direction are provided on peripheral sides of both ends thereof, and the slits at both ends are connected to connection holes of adjacent vertical piles. A landslide prevention pile construction structure characterized in that the landslide prevention pile is fitted into a vertical stake, bent outward in the radial direction, and attached to a vertical pile. 7. The horizontal connection pile of the landslide prevention pile is formed of a steel pipe, and both ends thereof are chambers containing an expanding agent that absorbs water and expands, and both ends of this chamber are adjacent vertical piles. 2. The construction structure for a landslide prevention pile according to claim 1, wherein the pile is inserted into the connection hole of (1) and expanded with moisture to form a retaining portion and attached to a vertical pile. 8. The construction structure for a landslide prevention pile according to claim 1, wherein the horizontal connection pile of the landslide prevention pile is made of a flexible steel wire material as a core material. 9. A landslide prevention pile having an inclined surface formed by placing a plurality of landslide prevention piles on an inclined surface and connecting and fixing the heads of the landslide prevention piles to each other with a connecting member. A plurality of vertical piles cast on the ground, a plurality of inclined connection piles for firmly connecting the lower end of one vertical pile and the upper end of the other vertical pile of adjacent vertical piles to each other, A method for constructing a landslide prevention pile comprising a plurality of horizontal connection piles for connecting at least two upper and lower portions in the middle of a pile in a horizontal direction, and forming the landslide prevention pile into a frame type truss shape, characterized by the following steps: Landslide prevention pile construction method. (1) The vertical pile is provided with a connection hole at the corresponding position for connecting the horizontal connection pile, and the hole is a steel pipe closed with a cover,
A step of drilling a vertical hole in an appropriate place on the ground and inserting the vertical pile. (2) A step of filling a fixing material between the outside of the inserted vertical pile and the wall surface of the vertical hole. (3) For the adjacent vertical piles that have been cast, penetrate the cover from the connection hole of one of the vertical piles to the connection hole of the other vertical pile, insert the horizontal connection pile, and insert the adjacent vertical pile. The process of connecting with horizontal connecting piles. (4) The inclined connection pile is a steel pipe having a drill bit at the tip, and drills holes from the vicinity of the head of one of the vertical piles to the bottom of the other vertical pile of the installed vertical pile to form the inclined connection. The process of inserting a stake. (5) A step of piercing the lower end of the vertical pile using the drill bit at the tip of the inclined connection pile, and fitting the tip of the inclined connection pile into the lower end of the vertical pile. (6) A step of injecting a fixing material from the inside of the vertical pile and filling the fixing agent into the inside of the vertical pile and the horizontal connection hole. (7) fixing the upper part of the inclined connection pile and the upper part of the vertical pile. (8) A step of filling a fixing agent between the inside of the inclined connecting pile and the outside of the inclined connecting pile and the hole wall surface. 10. A double pipe excavation method in which the inclined connecting pile is a steel pipe having a drill bit at a tip thereof, the inclined connecting pile is an outer pipe, and a drill rod having a drill bit at an end is an inner pipe. The method for constructing a landslide prevention pile according to claim 9, wherein the pile is buried. 11. The horizontal connection pile is a steel wire material having a stopper fixed to one end, and connected to an excavator to break a cover from a connection hole of one vertical pile and excavate a horizontal hole while excavating a horizontal hole. The wire is pulled out by being inserted into the connection hole of the pile, and the excavator is recovered from inside the other vertical pile, and a stopper which does not come off from the connection hole is fixed to one end of the wire and pulled from the other end. The method according to claim 9, wherein the fitting of the vertical pile is tightened, and then the inside and the horizontal hole of the vertical pile are filled with an adhesive.