JPH05171654A - Execution construction of landslid protection pile and execution method - Google Patents

Abstract

PURPOSE:To enhance rigidity by forming a plurality of vertical piles driven into the ground, a slope coupling pile coupling the lower end of one vertical pile with the upper end of the other vertical pile and a horizontal coupling pile coupling the vertical piles in the horizontal direction. CONSTITUTION:Excavated vertical piles 2 and 2 are buried into two adjacent vertical holes 21. After that, one end of a wire 14 as the core of a horizontal coupling pile 4 is connected to the rear of an excavator from a coupling hole 13 of one pile 2 to excavate a horizontal hole 16, the excavator is withdrawn from the other pile 2, a stopper 15 is fixed to one end of the wire 14 to strain the tension piles 2 and 2 from the other end, and a sticking agent 17 is poured to the inside of the pile 2 until the hole 16 is buried. Then, an outside pipe welding a drilling bit 26 to the front end thereof is made as a slope coupling pile 3 toward the bottom of the other pile 2 from a neighborhood of an opening of a hole 21, an inclined hole 22 is excavated by an excavation rod using a hole widening bit 26 on the front end thereof as an inside pipe to bury the pile 3, the pile 2 is drilled with the bit 26 to insert the front end of the pile 3 into a drifting 8, and a sticking agent 9 is filled from the top of the pile 3 to connect the piles 2 and 3.

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 for a landslide prevention pile on an inclined surface, and more particularly, to a plurality of landslide prevention piles driven 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 truss shape by firmly connecting and connecting an inclined connection pile that connects the upper end and the lower end to each other and a horizontal connection pile that connects the middle part of the vertical pile horizontally Regarding the construction method.

[0002]

2. Description of the Related Art Conventionally, as a construction method for preventing a landslide of earth and sand formed by cutting and embankment or a landslide collapse in a mountainous area, a method of driving a landslide suppressing pile on an inclined surface has been known. This conventional construction method is generally a method in which individual landslide suppressing piles are simply driven and the heads of adjacent suppressing piles are connected to each other to form a landslide suppressing pile. For example, FIG. 15 and FIG. 16 are a plan view and a cross-sectional view showing a conventional example, and as shown in FIG. 15, the steel pipe piles 31 placed in the ground have the heads of the adjacent steel pipe piles made of the connecting steel material 32. Connected,
Concrete 33 is struck by using the bonded steel material 32 as a core material, and the steel pipe pile 31 is also filled with concrete 34 to form a landslide prevention pile.

[0003]

However, when the load of earth and sand on the restraint pile is large, only one end (head) of each restraint pile (steel pipe pile) is connected. The restraining piles oppose each other, cannot withstand a large load, and are not necessarily landslide restraining piles having sufficient strength. As a result, the restraint piles could not bear the load to prevent landslides, and landslides occurred. 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 counteracting the earth pressure even when a large load of earth and sand is applied to the prevention pile. The purpose is that.

[0004]

In order to achieve the above object, the present invention is to drive a plurality of landslide suppressing piles on an inclined surface, and connect the heads of the landslide suppressing piles to each other with a connecting member. In the construction structure of landslide prevention piles with fixed slopes, the landslide prevention piles consist of a plurality of vertical piles laid on the ground and the lower end of one vertical pile of the adjacent vertical piles and the other vertical pile. A landslide prevention pile was formed in a frame-type truss shape, which consisted of an inclined connection pile that fixedly connects the upper end part to each other and a horizontal connection pile that horizontally connects at least two places in the middle part of adjacent vertical piles in the horizontal direction. It is configured. The inclined connection pile of the landslide restraining pile is formed of a steel pipe having a drilling bit for drilling a vertical pile at the lower end thereof, and the bit is drilled at the bottom of the vertical pile to be attached to the vertical pile, the landslide restraining pile The inclined connection pile of is formed of a steel pipe, and a plurality of axial slits are provided on the lower peripheral surface of the pile.
A structure in which the slit portion at the lower end is fitted in a hole formed in the lower portion of the vertical pile and curved outward in the radial direction to serve as a retaining portion and attached to the vertical pile, the inclined connection pile of the landslide prevention pile is formed of a steel pipe. , The lower end of which is a chamber containing an expansive agent that absorbs moisture and expands, and this chamber part is fitted into the hole of the vertical pile and expanded by moisture to be attached as a retaining portion to the vertical pile The side wall surface is provided with a connecting hole, and the horizontal connecting pile is fitted and mounted in the connecting hole of the adjacent vertical pile.The horizontal connecting pile of the landslide restraining pile is formed of steel pipes, and both end circumferences thereof are formed. A configuration in which a plurality of slits in the axial direction are provided on the side surface, and the slit portions at both ends are fitted into the connecting holes of the adjacent vertical piles and curved outward in the radial direction to serve as retaining portions, which are attached to the vertical piles, the landslide The horizontal connection pile of the restraint pile is made of steel pipe and its The end is a chamber containing an expansive agent that absorbs moisture and expands, and both ends of this chamber are fitted into the connecting holes of the adjacent vertical piles and expanded by moisture to be attached to the vertical piles as stoppers, The horizontal connection pile of the landslide prevention pile has a structure in which a flexible steel wire material is used as a core material.

Further, according to the present invention, in a landslide suppressing pile having an inclined surface, a plurality of landslide suppressing piles are driven on an inclined surface, and heads of the landslide suppressing piles are connected and fixed to each other by a connecting member. The landslide prevention pile is a plurality of vertical piles driven into the ground, and a plurality of inclined connection piles that firmly connect the lower end portion of one vertical pile of the adjacent vertical piles and the upper end portion of the other vertical pile to each other. A method for constructing a landslide prevention pile, which comprises a plurality of horizontal connection piles horizontally connecting at least two places above and below a midway portion of adjacent vertical piles, and forms the landslide prevention pile in a frame truss shape. The configuration is characterized by steps. (1) The vertical pile is a steel pipe in which a connecting hole is formed at a corresponding position for connecting the horizontal connecting pile, and the hole is a steel pipe closed by 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 the adhesive between the outside of the inserted vertical pile and the wall surface of the vertical hole. (3) Adjacent vertical piles by inserting the horizontal connecting pile by drilling through the cover from the connecting hole of one vertical pile of the adjacent vertical piles that were placed above to the connecting hole of the other 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 the inclined connection is made by drilling a hole from the vicinity of the head of one vertical pile of the adjacent vertical piles that have been placed toward the bottom of the other vertical pile. The process of inserting piles. (5) A step of perforating the lower end of the vertical pile using the perforation 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 inside of the vertical pile and the horizontal connecting hole with the fixing agent. (7) A step of 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 connection pile and the outside of the inclined connection pile and the hole wall surface. And, the inclined connecting pile is a steel pipe having a drill bit at the tip, the inclined connecting pile is an outer pipe, means for burying by a double pipe excavation method with an excavating rod having a hole expanding bit at the tip as an inner pipe, The horizontal connecting pile is a steel wire material with a stopper fixed at one end, and is connected to an excavator to break the cover from the connecting hole of one vertical pile to excavate a horizontal hole while connecting to the connecting hole of the other vertical pile. The wire is pulled out by inserting it through the other vertical pile and collecting the excavator from the other vertical pile, and a stopper that does not come off from the connecting hole is fixed to one end of the wire and pulled from the other end to tighten the adjacent vertical piles. And then a means for filling the inside of the vertical pile and the horizontal holes with adhesive,
Is adopted as an embodiment.

[0006]

[Operation] The landslide prevention pile is a frame type truss in which the lower end and the upper end of the adjacent vertical piles are fixedly connected by inclined connection piles, and the middle part of the vertical piles is also fixedly connected horizontally by horizontal connection piles. Since it is formed into a shape, even if a large load that cannot be withstood by individual restraint piles is applied to the landslide restraint pile, the load applied to the restraint piles is dispersed, and the load applied to each restraint pile is reduced, and even large loads are applied. Can withstand enough. Therefore, even in a dangerous area where the landslide ground is deep, it is possible to sufficiently withstand the earth pressure and prevent the ground from collapsing.

Further, according to the construction method of the present invention, the construction structure of the landslide suppressing 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 same. A landslide prevention pile 1 is composed of a plurality of vertical piles 2 placed in the ground and adjacent vertical piles 2 and 2. , A frame type from an inclined connection pile 3 that firmly connects the upper end of one vertical pile 2 and a lower end of the other vertical pile 2 and a horizontal connection pile 4 that horizontally connects the middle portions of the vertical piles 2 and 2. Composed in a truss shape. The heads of the vertical piles 2 are also connected by the connecting member 5, but this is the same as the conventional example, and therefore the description thereof is omitted below.

Steel pipe piles are used as the vertical piles 2 and the inclined connection piles 3, and the upper ends of the inclined connection piles 3 are welded 6 to the upper ends of the vertical piles 2 as shown in FIG. As shown, the screws 7 are fixed and fixedly connected. Further, the lower end of the inclined connecting pile 3 is fitted into the side wall hole 8 formed in the vertical pile 2 as shown in FIG.
Means for injecting and fixing the slanted connecting pile 3 as shown in FIG.
A plurality of axial slits 10 are provided on the peripheral side surface of the lower end of the vertical pile 2, and the slits 10 are fitted into the side wall holes 8 drilled at the lower end of the vertical pile 2 and then curved outward in the radial direction to serve as a retaining portion. A means for injecting and fixing the water and a lower end portion of the inclined connection pile 3 as shown in FIG. 7 are provided with a chamber 11 containing an expansive agent 12 such as a static crushing agent that absorbs water and expands. The lower end portion provided with this chamber 11 is fitted into the side wall hole 8 drilled in the lower end portion of the vertical pile 2 and then expanded and expanded with water to form a retaining portion, and then a fixing agent 9 is injected and fixedly connected by means of fixing and the like. To be done.

In the horizontal connecting pile 4, as shown in FIG. 8, a wire 14 as a core material is inserted into a connecting hole 13 formed in the vertical pile 2 and a stopper 15 is fixed to one end of the wire. Adjacent vertical piles 2, 2 by pulling from the end side
Means for tightening, and filling and connecting the fixing agent 17 in the vertical piles 2 and in the horizontal holes 16 as shown in FIG.
A plurality of slits 18 in the axial direction are provided on the peripheral side surfaces of both ends of each of the two, and the slits 18 at the both ends are fitted into the connecting holes 13 of the vertical piles 2 and then curved outward in the radial direction to serve as retaining portions.
A means for filling and adhering the same, and, as shown in FIG. 10, at both ends of the horizontal connecting pile 4 are provided chambers 19 containing an expansive agent 20 that absorbs water and expands. After being fitted into the connecting hole 13 of the vertical pile 2, it is fixedly connected by a means for expanding with water and forming a retaining portion. Further, as will be described later in detail, the vertical pile 2 and the inclined connection pile 3 are first drilled in the vertical hole 21 and the inclined hole 22 with a boring device (not shown), and then the vertical pile 2 and the inclined pile 22 are formed in the holes 21 and 22. The inclined connecting pile 3 may be inserted and buried, or the vertical pile 2 and the inclined connecting pile 3 may be embedded.
You may bury by the double pipe excavation method which uses as an outer pipe. The adhesive 17 is filled on the outer side and the inner side of the vertical pile 2 and on the outer side and the inner side of the inclined connection pile 3. This adhesive 17 is
It is a cement adhesive to the ground of piles 2 and 4, and cement milk,
Mortar or the like is used. As the adhesive 9 for the vertical pile 2 and the inclined connection pile 3, cement milk, mortar, polymer solution or the like is used.

Since the landslide restraining pile 1 is composed of the vertical pile 2, the inclined connecting pile 3 and the horizontal connecting pile 4 in a frame type truss type, the load applied to the restraining piles is dispersed and the individual vertical piles are separated. The load applied to the pile 2 is reduced, and a large load can be sufficiently endured.

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 connecting piles 3 to bury. To do. Then, based on the planned number of buried vertical piles 2, an excavation plan is made in consideration of the arrangement of vertical holes 21, etc., and at the same time, it is examined in advance which vertical piles 2 should be connected horizontally and which vertical piles 2 should be connected in a trust type. After adding, 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 placed, and first the vertical holes 21 are sequentially excavated as shown in FIG. As a method for excavating the vertical hole 21, there is a conventional large-diameter boring method. In this case, after excavating all the vertical holes 21, you may transfer to excavation of the inclined hole 22 and the horizontal hole 16,
After excavating some vertical holes 21, you may move to excavation of the inclined hole 22, and the construction order may be appropriately determined depending on the situation of the site. 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 To do. Here, the ground G ₁ indicates a soft ground where landslide is dangerous, and the ground G ₂ indicates a hard ground where there is no risk of landslide. The depth of the vertical holes 21 is about 30 m, but this depth varies depending on the situation of the site and the like.

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

For the excavation of the vertical hole 21, a conventionally known means, for example, a large diameter boring method is adopted, and for the excavation of the horizontal hole 16 and the inclined hole 22, a conventionally known means, for example, a rotary. Double pipe excavation method with percussion drill, ODEX method suitable for excavation on relatively soft ground in Overbaden, Grundmart method, lateral hole forming auger device (Japanese Patent Laid-Open No. 52-1512)
14), water jet excavation method (Japanese Patent Laid-Open No. 63-
No. 210396) and SST method (Japanese Patent Publication No. 62-272).
No. 38) is adopted.

For example, the horizontal hole 16 is a horizontal base (not shown) at the starting point of excavation in the middle of one adjacent vertical hole 21.
Is installed, the excavator of the construction method is set on the base, and excavation is performed from the ground surface while controlling the excavator. Alternatively, two large-diameter vertical holes where horizontal excavators can be installed are first excavated at both ends in the horizontal direction of the landslide prevention area, and they are arranged between the vertical holes by the auger device for forming a horizontal hole and the SST method described above. It is also possible to employ a method of excavating the vertical hole 21 (vertical pile 2) while horizontally penetrating it in a skewered shape. In any case, these vertical hole 21, horizontal hole 16 and inclined hole 2
When excavating No. 2, the excavation method adapted to the site may be adopted.

When the excavation of the adjacent vertical holes 21 according to the excavation plan is completed in this way, the vertical piles 2 are built in the vertical holes 21 as shown in FIG. The horizontal connecting pile 4 is connected to the middle of the built-in adjacent vertical piles 2 and 2. The horizontal connecting pile 4 needs to be provided at least in the vicinity of the lower end of the vertical pile 2 and in the middle thereof. A connecting hole 13 is preliminarily formed at a side surface position of the vertical pile 2 to which the horizontal connecting pile 4 is connected, and the connecting hole 13 is closed from the outside by a plastic cover 23 (FIG. 12). And
When the vertical piles 2 are successively buried by welding or the like to be buried to a predetermined depth, the connecting holes 13, 13 of the adjacent vertical piles 2, 2 are buried so as to face each other as shown in FIG. 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 broken from the connecting hole 13 of the one vertical pile 2 and the horizontal hole 16 which is inserted into the connecting hole 13 of the other vertical pile 2 is excavated. For the excavation of the horizontal hole 16, a conventionally known water jet excavator or an excavator of Grundmart method is adopted. When excavating the horizontal hole 16, one end of a wire 14 made of, for example, a flexible steel, 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 material for the adjacent vertical piles 2 and 2 (FIG. 14). In this case, as shown in FIG. 14, the stopper 1 that does not come off from the connecting hole 13 at one end of the wire 14
Adjacent vertical piles 2 and 2 can be tightened by fixing 5 and pulling from the other end. Then, the adjacent vertical piles 2 and 2 are tightened, and the adhesive 17 flows into the inside of the vertical pile 2 until the horizontal hole 16 is buried. This adhesive 17
Inflows until the horizontal hole 16 is fully filled.
The inflow timing of the adhesive 17 is determined in consideration of the connection of the inclined connection pile 3. According to the above procedure, the plurality of vertical piles 2 and 2 are connected to each other by the horizontal connection pile 4.

The method of building the vertical piles 2 immediately after excavation of the vertical holes 21 is to prevent the vertical holes 21 from collapsing because the ground G ₁ is soft ground and the vertical holes 21 do not collapse. If there is no concern, the vertical pile 2 and the horizontal connecting pile 4 may be formed after excavating the vertical hole 21 and the horizontal hole 16.

Explaining the excavation of the inclined hole 21 and the laying of the inclined connecting pile 3 will now be described. The vertical holes provided from the vicinity of the opening of one vertical hole 21 of the adjacent vertical piles 2 and 2 to the other vertical hole 21. The inclined hole 22 is excavated toward the bottom of the pile 2. This inclined hole 22 is excavated by the above-mentioned method, for example, the double pipe excavation method and the ODEX method. According to this excavation, the inclined connection pile 3 can be buried at the same time as drilling. For example, an excavator according to the ODEX method is installed in the vicinity of the opening of the vertical hole 21 for starting excavation, and the outer pipe having the drill bit 26 welded to the tip as shown in FIG. When excavating with a drilling rod having a hole-expanding bit at the tip in the pile 3, the hole-expanding bit of the excavating rod serving as the inner pipe projects from the tip of the outer pipe that is the inclined connecting pile 3 and eccentrically rotates to rotate the outer pipe. The diameter is larger than the diameter, and the inclined connecting piles 3 are sequentially inserted by welding or the like while being inserted, and are installed at the same time as the excavation. When the excavating rod as the inner pipe is rotated in the reverse direction, the hole-expanding bit is reduced in diameter, so that the hole-expanding bit can be drawn into the outer pipe that is the inclined connecting pile 3 to remove the excavating rod. In this way, the inclined connecting piles 3 serving as outer pipes are vertical piles 2.
When coming into contact with the lower end of the
Perforated bit 2 fixed to the tip of the outer pipe to be the inclined connection pile 3
Perforate vertical pile 2 at 6. Therefore, the vertical pile 2 is previously fixed with the adhesive 17 such as cement milk or mortar.
It is preferable that the outer side of the hole is solidified so as to sufficiently withstand the impact of drilling of the drill bit 26.

When the lower end portion of the vertical pile 2 is perforated by the perforation bit 26 and the tip of the inclined connection pile 3 is inserted into the hole 8 as shown in FIG. 5, the cement milk is fed from the upper opening of the inclined connection pile 3. , Fixing agent 9 such as mortar or polymer solution. The adhesive 9 flows from the inside of the inclined connecting pile 3 to the outer peripheral side surface after passing between the teeth of the drill bit 26 and between the teeth and the water channel, so that it is filled until the inner and outer peripheral side surfaces of the inclined connecting pile 3 are filled. ..

Further, in the ODEX method of the above-mentioned 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 excavation rod is drilled for the vertical pile 2, the excavation rod is extracted, a connecting steel pipe to be the inclined connection pile 3 having a diameter smaller than that of the outer pipe is inserted, and then the outer pipe is extracted, and then the adhesive agent is removed. Vertical vertical pile 2 and inclined connecting pile 3
Connect and fix. In this case, it is preferable that a flange is provided at the tip of the connecting steel pipe to be the inclined connecting pile 3 so as to prevent it from coming off.

Furthermore, as another embodiment, as shown in FIG. 6, an inclined connecting pile 3 having a plurality of slits 10 at the lower end portion of the inclined connecting pile 3 can be used. That is, in the inclined connection pile 3, the steel ring piece 24 having the screw hole 25 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. A plurality of slits 10 are provided 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 so as to be indexable from above the inclined connection pile 3. For example, an index rod 27 is provided, and after inserting the lower end of the inclined connection pile 3 into the side wall hole 8 of the vertical pile 2, the index rod 27 is indexed upward to bend the slit 10 portion outward in the radial direction. Then, a retaining portion is formed, and a fixing agent is poured in and fixedly connected (FIG. 6). In the present embodiment, in the first burying of the vertical pile 2, the adhesive 17 is poured only on the outer peripheral side of the vertical pile 2, the inside is made hollow, and the adhesive 17 is poured after connecting the inclined connecting pile 3. Becomes In this case, if the screw hole 25 is screwed to a screw for replenishing 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, and then the index rod 27 is formed. This can be recovered by unscrewing 27.

As yet another embodiment, as shown in FIG. 7, the lower end portion of the inclined connecting pile 3 is a chamber containing an expansive agent 12, such as a static crushing agent, which expands by absorbing moisture. 11, and this chamber 11 part is a side wall hole 8 at the lower end of the vertical pile 2.
There is also a method in which the expansion agent 12 absorbs moisture and expands when the backing is inserted into and filled in, and 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 described above.
The method of forming the retaining portion by providing 0 and the method of forming the retaining portion by using the expansion agent 12 can also be adopted for the fixed connection of the horizontal connecting pile 4 to the vertical pile 2 (FIGS. 9 and 10). In this case, for example, as the horizontal connecting pile 4 as a steel bar or a steel pipe,
A method is used in which a vertical excavation hole 21 excavated to a large diameter is inserted by a horizontal excavator while being added.

However, the frame type truss type landslide restraint in which the respective connecting portions of the vertical pile 2, the inclined connecting pile 3 and the horizontal connecting pile 4 are firmly and firmly connected to each other in the construction procedure by repeating the above-mentioned work. The pile 1 can be installed 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, but the present invention is not limited to the steel pipe pile, and, for example, H-section steel, L instead of the steel pipe.
Shaped steel, I-shaped steel, etc. can also be used. Further, the inclined connecting pile 3 is not limited to the steel pipe as long as it can be connected and fixed to the vertical pile 3 in short, and the design of the connecting portion can be appropriately changed by welding or other fixing method.

[0027]

As described above, a plurality of landslide prevention piles are driven 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 of the vertical piles and the upper end of the other vertical pile are fixedly connected by a tilted connecting pile and fixedly connected in a frame type truss shape, and the horizontal connecting pile is fixedly connected in the middle in the horizontal direction. Therefore, the landslide prevention pile as a whole can be made stronger and steely, and the load applied to each vertical pile is distributed, reducing the load on each vertical pile and significantly increasing the load bearing capacity. Can be enhanced. As a result, a thin steel material can be subjected to a large load of earth pressure, and the construction unit price can be greatly reduced, which is economical. Moreover, according to the construction method of the present invention, the landslide prevention pile of the present invention can be easily constructed.

[Brief description of 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 heads of the vertical pile and the inclined connection pile.

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

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

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

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

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

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

FIG. 12 is an enlarged cross sectional view showing the next step.

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

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

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

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

[Explanation of symbols]

 1 Landslide Prevention Pile 2 Vertical Pile 3 Inclined Connection Pile 8 Sidewall Hole 9 Adhesive 10,18 Slit 11,19 Chamber 12,20 Expansion Agent 13 Connection Hole 14 Wire 16 Horizontal Hole 17 Adhesive 21 Vertical Hole 22 Inclined Hole

Claims (11)

[Claims] 1. A construction structure for a landslide-preventing pile having an inclined surface, in which a plurality of landslide-preventing piles are driven on the inclined surface, and heads of the landslide-preventing piles are connected and fixed to each other by a connecting member. The restraint pile is adjacent to a plurality of vertical piles that are placed in the ground, and an inclined connection pile that firmly connects the lower end of one vertical pile of the adjacent vertical piles and the upper end of the other vertical pile to each other. A construction structure for a landslide prevention pile, characterized in that the landslide prevention pile is formed in a frame truss shape, and is composed of horizontal connection piles that horizontally connect at least two locations above and below the midway portion of the vertical pile. 2. The sloped connection pile of the landslide prevention pile is formed of a steel pipe having a drilling bit for drilling a vertical pile at the lower end thereof, and the bit is drilled at the bottom of the vertical pile to be attached to the vertical pile. The construction structure of the landslide prevention pile according to claim 1. 3. The inclined connection pile of the landslide prevention pile is formed of a steel pipe, and a plurality of axial slits are provided on the peripheral side surface of the lower end thereof, and the slit portion of the lower end is formed in the lower portion of the vertical pile. 2. The construction structure for a landslide prevention pile according to claim 1, wherein the construction is fitted in the hole and curved outward in the radial direction to be attached to a vertical pile as a retaining portion. 4. The inclined connection pile of the landslide prevention pile is formed of a steel pipe, and the lower end thereof is a chamber containing an expansive agent that absorbs water and expands. The chamber portion is fitted into the hole of the vertical pile. The construction structure for a landslide prevention pile according to claim 1, wherein the construction is carried out by expanding with water to serve as a retaining portion and 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 the horizontal connection pile is fitted into and attached to the connection hole of the adjacent vertical pile. Pile construction structure. 6. The horizontal connection pile of the landslide prevention pile is formed of a steel pipe, and a plurality of axial slits are provided on the peripheral side surfaces of both ends of the horizontal connection pile. A construction structure for a landslide prevention pile, which is fitted to a vertical pile and is attached to a vertical pile by bending it outward in the radial direction to form a retaining portion. 7. The horizontal connection piles of the landslide prevention piles are formed of steel pipes, and both ends of the horizontal connection piles are chambers containing an expansive agent that absorbs water and expands. Both ends of the chambers are adjacent vertical piles. 2. The construction structure for a landslide prevention pile according to claim 1, wherein the construction is fitted into the connection hole of the above and expanded with water to serve as a retaining portion and attached to the vertical pile. 8. The construction structure of a landslide prevention pile according to claim 1, wherein the horizontal connection piles of the landslide prevention pile are made of a flexible steel wire material as a core material. 9. A landslide suppressing pile having an inclined surface, in which a plurality of landslide suppressing piles are driven on an inclined surface, and heads of the landslide suppressing piles are connected and fixed to each other by a connecting member. , A plurality of vertical piles placed in the ground, and a plurality of inclined connection piles for firmly connecting the lower end portion of one vertical pile of the adjacent vertical piles and the upper end portion of the other vertical pile to each other, and adjacent vertical piles A method for constructing a landslide prevention pile, which comprises a plurality of horizontal connection piles that horizontally connect at least two locations above and below the midway portion of the pile, and forms the landslide prevention pile in a frame truss shape, characterized by the following steps: Construction method for landslide prevention piles. (1) The vertical pile is a steel pipe in which a connecting hole is formed at a corresponding position for connecting the horizontal connecting pile, and the hole is a steel pipe closed by 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) Adjacent vertical piles by inserting the horizontal connecting pile by drilling through the cover from the connecting hole of one vertical pile of the adjacent vertical piles that were placed above to the connecting hole of the other 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 the inclined connection is made by drilling a hole from the vicinity of the head of one vertical pile of the adjacent vertical piles that have been placed toward the bottom of the other vertical pile. The process of inserting piles. (5) A step of perforating the lower end of the vertical pile using the perforation 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 inside of the vertical pile and the horizontal connecting hole with the fixing agent. (7) A step of 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 connection pile and the outside of the inclined connection pile and the hole wall surface. 10. The double pipe excavation method in which the inclined connecting pile is a steel pipe having a drill bit at the tip, the inclined connecting pile is an outer pipe, and the drill rod having a hole expanding bit at the tip is an inner pipe, The method for constructing a landslide prevention pile according to claim 9, wherein the method is carried out. 11. The horizontal connecting pile is made of a steel wire material having a stopper fixed to one end thereof, and is connected to an excavator to break the cover from the connecting hole of one vertical pile to excavate the horizontal hole while the other vertical pile is being drilled. The wire is pulled out by inserting it into the connecting hole of the pile and recovering the excavator from the other vertical pile, and a stopper that does not come off from the connecting hole is fixed to one end of the wire and pulled from the other end to The method for constructing a landslide suppressing pile according to claim 9, wherein the vertical piles that fit together are tightened, and then the inside and the horizontal holes of the vertical piles are filled with a fixing agent.