JP2003184100A - Preventive pile for preventing landslide, and increasing method of preventing and supporting force of support pile for structure foundation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a strength that concrete or the like which is filled in the inside of a steel pipe pile or in between an H section steel pile and a boring hole holds is neglected. <P>SOLUTION: A bottom cover (10) is welded to the lower end of a steel pipe pile (6). A reinforcement (8) is wound up on the whole peripheral face of the steel pipe pile (6) at every equivalent pitch and welded. The steel pipe pile (6) attached with a bottom cover (10) is hung by a winch or the like and erected in the boring hole (5). Mortar (7) or the like is filled into the inner/outer peripheries of the erected steel pipe pile (6). After curing of the filler, a steel pressurizing plate (11) having one size smaller inner diameter than the steel pipe pile (6) is put on the cured mortar (7) or the like and a bolt (14) or a nut (15) is fastened to pressurize from one side of the ground surface side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to increasing the deterrent force of a deterrent pile, which is one of the methods for preventing landslides and landslides.

[0002]

2. Description of the Related Art As shown in FIGS. 1 and 2, a deterrent pile is one in which a slipping mass of soil to be activated is drilled to a stable ground by boring, and a pile is put in the boring hole to deter it.

The general construction method of the restraint pile is as follows. A large diameter boring is used to drill a hole from the surface of the ground through the slip mass to the immovable ground, and a steel pipe pile or H steel pile is built in the boring hole. Mortar or ready-mixed concrete can be pumped in or around the pile. Fill. Then, the activity of the upper-level slip mass is suppressed by the immovable ground as a reaction force, and the pile is used as a cantilever to suppress the landslide.

[0004]

However, the following problems still remain in the deterrent pile work to date. When restraining landslide activities with piles, stability analysis is performed in advance to calculate the required restraint force.At that time, the strength of the mortar and ready-mixed concrete that are filled inside or around the restraint pile is It cannot be estimated at all. The reason is that when the landslide starts its activity, the restraint pile bends and bends as shown in Fig. 1 and Fig. 2, and the tensile force acts on the mountain side (A) while the compressive force acts on the valley side (B). It is well known that hardened mortar and concrete materials are strong in compression but very weak in tension. The intensity difference is about 1/10
~ 12. Therefore, the strength of mortar and concrete materials has been calculated by ignoring the state under tension. The mortar around the pile is filled only for the purpose of making it familiar with the ground, the expected strength of the mortar is about the same as the slip mass, and the concrete etc. packed inside the steel pipe pile is filled for the purpose of anticorrosion of the steel pipe. It's just The price of concrete is certainly cheaper than that of steel, but it is an uneconomical story.

The present invention has been variously studied and tested in view of the above problems. And, by maximizing the strength of the concrete, which is cheaper than steel materials, to increase the deterrent force of the pile, the drilling depth and diameter of large diameter boring are reduced, and the strength of the pile Considered and implemented to reduce. In other words, it will provide technology that will lead to a significant reduction in construction costs.

From the above, the present invention described later cannot be applied to active landslides, but not all landslides are always continuous and active. It may slow down or stop. Occurrence of landslides and landslides is close to 100% except for earthquakes, and is associated with heavy rain and long rain. In other words, as a result of the rise in groundwater level, the shear strength of the ground is reduced and it occurs. In addition, although slipping down will occur, the slipped mass of soil will be stable, even temporarily. It is even more so when the sunshine continues and the groundwater level drops. Furthermore, most of the steep slope prevention work is a proactive measure for places where there is a possibility of collapse, and is not active.
Therefore, there are many places where the present invention can be adopted.

[0007]

[Means for Solving the Problems]

The inventor has devised the following method by taking advantage of the characteristics of concrete and the like.

Therefore, let us consider the stress relationship between the landslide and the restraining pile. When the slip soil mass 2 starts to act, the thrust 22 acts on the steel pipe pile 6, and then the steel pipe pile 6 bends and bends. At that time, the tensile force 24 acts on the mountain side A of the steel pipe pile 6 and the other side A compressive force 25 acts on the valley side B. Then, on the mountain side A of the concrete 7 inside and outside the steel pipe pile 6, tensile cracks easily occur and the strength is lost. However, on the contrary, it is the result that the valley side B is slightly compressed.

Therefore, the concrete 7 inside and outside the steel pipe pile 6
I wondered what would happen if I forced to compress. As long as it is inside the boring hole 5 or inside the steel pipe pile 6, all the strength of the concrete 7 is significantly increased. In particular, the concrete 7 inside the steel pipe pile 6 is in a container surrounded on all sides and therefore cannot be deformed. Therefore, safe and reliable increase in strength can be expected. Furthermore, even if there are cracks in the concrete 7 for some reason, the strength of the concrete 7 cannot be ignored because a large tightening frictional force acts on those surfaces. Therefore, as long as the active thrust 22 of the landslide does not exceed the restraining stress of the steel pipe pile 6 + the compressive stress of the concrete 7, the deflection of the steel pipe pile 6 is kept to the minimum. That is, the deterrent force of the steel pipe pile 6 is increased.

The method for forcibly compressing the concrete 7 inside and outside the steel pipe pile 6 is as follows. As shown in FIGS. 3, 4, 5, and 6, the bottom lid 10 is attached to the lower end of the steel pipe pile 6 or the H steel pile by welding, and the canopy 9 is attached to the upper end. Reinforcing bars 8 and the like were welded to the outer periphery of the steel pipe pile 6 at equal intervals to form protrusions.

In FIG. 3, a PC is attached to the bottom lid 10 of the steel pipe pile 6.
The deformed steel rod 12-1 is welded, the upper side of the deformed steel rod 12-1 is passed through the hole of the compression plate 11, the compression plate 11 is placed on the hardened concrete 7, and the deformed steel rod 12-1 is tightened with the tightening nut 1
Method of turning 7 and tightening the nut 17 with a torque wrench to pressurize the compression plate 11.

In FIG. 4, several PC deformed steel bars 12-1 are welded around the bottom lid 10 of the steel pipe pile 6 to form the deformed steel bars 12-.
1 through the hole of the compression plate 11, put the compression plate 11 on the hardened concrete 7, turn the tightening nut 17 into the deformed steel rod 12-1, and use the torque wrench to tighten the nut 17
To press the entire compression plate 11.

In FIG. 5, a pulling member U-turn hetter 16 is attached to the bottom lid 10 of the steel pipe pile 6 by welding or the like. Then, the PC twisted wire 12-2 etc. covered with the sheath material is passed through the U-turn heter 16 and pulled up to above the restraint pile 6,
Strip the sheath material at the tip of the stranded wire 12-2 to compress the compression plate 11
A compression plate is placed on the hardened concrete 7 through the hole of No. 2, and the wire 12-2 from the PC is tensioned with a jack to press the compression plate 11 and fix it with the wedge 18.

In FIG. 6, several PC deformed steel bars 12-1 are welded around the bottom lid 10 of the H steel pile to form the deformed steel bars 12-1.
Through the hole of the compression plate 11, put it on the hardened concrete 7, and attach it to the deformed steel rod 12-1 with the tightening nut 17
And press the compression plate 11 by tightening the nut 17 with a torque wrench.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the invention will be described based on examples with reference to the drawings.

As shown in FIGS. 3, 4, 5, and 6, the bottom lid 10 is attached to the lower end of the steel pipe pile 6 or the H steel pile by welding, and the canopy 9 is attached to the upper end.

In FIG. 3, a PC is attached to the bottom lid 10 of the steel pipe pile 6.
The deformed steel rod 12-1 is welded, the upper side of the deformed steel rod 12-1 is passed through the hole of the compression plate 11, the compression plate 11 is placed on the hardened concrete 7, and the deformed steel rod 12-1 is tightened with a nut. A method of turning 17 and tightening the nut 17 with a torque wrench to pressurize the compression plate 11.

In FIG. 4, several PC deformed steel bars 12-1 are welded around the bottom lid 10 of the steel pipe pile 6 to form the deformed steel bars 12-.
1 through the hole of the compression plate 11, put the compression plate 11 on the hardened concrete 7, turn the tightening nut 17 into the deformed steel rod 12-1, and use the torque wrench to tighten the nut 17
A method of tightening to pressurize the entire compression plate 11.

In FIG. 5, the tension member U-turn hetter 16 is attached to the bottom lid 10 of the steel pipe pile 6 by welding or the like. Then, the PC twisted wire 12-2 etc. covered with the sheath material is passed through the U-turn heter 16 and pulled up to above the restraint pile 6,
Strip the sheath material at the tip of the stranded wire 12-2 to compress the compression plate 11
The compression plate is placed on the hardened concrete 7 through the hole of No. 2, and the wires 12-2 and the like from the PC are tensioned with a jack and fixed to the compression plate 11 with wedges 18.

In FIG. 6, a PC deformed steel rod 12-1 is welded around the bottom cover 10 of the H steel pile, and the upper side of the deformed steel rod 12-1 is passed through the hole of the compression plate 11 to cure the hardened concrete 7. Place it on the top, turn the tightening nut 17 into the deformed steel bar 12-1, and tighten the nut 17 with a torque wrench to compress the compression plate 11
How to tighten.

[Effects of the Invention] When horizontal loading tests were conducted on steel pipe piles under various conditions on the surface of the earth, the displacement of this restraining pile in which a compression plate was placed and pressed on the interlining concrete of steel pipe piles and H steel piles was the smallest. That is, it was found that the compressive strength of the concrete can be expected by pressurizing the packed concrete. That is, the deterrent force of the steel pipe pile is increased.

[Brief description of drawings]

[Fig. 1] Overall cross-sectional view of a restraint pile installed to prevent landslides

[Figure 2] Up sectional view of the restraint pile installed to prevent landslides

[Fig. 3] Sectional view of attaching a PC deformed steel rod to the bottom lid of a steel pipe pile and tightening concrete with a compression plate.

[Fig. 4] Sectional view in which several PC deformed steel rods are attached around the inner bottom lid of a steel pipe pile and concrete is tightened with a compression plate.

FIG. 5 is a cross-sectional view in which the compression plate in the steel pipe pile is tightened with concrete using a PC stranded wire, etc.

FIG. 6 is a cross-sectional view in which several PC deformed steel bars are attached to the bottom lid of the H-hole pile and concrete is tightened with a compression plate.

[Explanation of symbols]

1, surface 12-2, tension member (such as PC twisted wire) 2, slip soil 13, lever member 3, slip surface 14, fulcrum 4, immovable ground 15, action point 5, boring hole and hole wall 16, tension member U Turn hetter 6, Steel pipe pile 17, Tightening nut 7, Mortar or ready-mixed concrete 18, Wedge 8, Reinforcing bar 19, Rack gear 9, Canopy 20, Gear 10, Bottom lid 21, Drum 11, Compression plate 22, Movement of sliding clod Direction (thrust) 12, tension member 23, H steel pile 12-1, rebar (PC deformed steel bar, etc.) 24, tensile force A, tensile side 25, compression force B, compression side

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[Procedure amendment]

[Submission date] July 20, 2002 (2002.7.2)
0)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title: Landslide prevention restraint pile and method for restraining a support pile of a structural foundation and increasing the bearing capacity.

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deterrent pile for preventing landslides, landslides and the like, and a deterrent force and a support force increase of a support pile of a structure foundation.

[0002]

2. Description of the Related Art As shown in FIGS. 1 and 2, a deterrent pile penetrates a slip surface with a large-diameter boring, drills holes to a stable and immovable ground, constructs steel pipe piles and H steel piles, and landslides. The moving soil mass is restrained by the shear and bending strength of the pile. Also, the inside or the outside of the pile is filled with injection mortar or concrete with a pump or the like.

[0003]

However, the following problems remain in the landslide prevention piles and the structure support piles that have been heretofore used. One is to perform a stability analysis in advance to estimate the required deterrent force when the landslide activity is restrained by a pile. However, the strength of mortar and concrete filled inside and outside the restraint pile cannot be estimated at all in the calculation conditions. The reason is that, as shown in Fig. 1 and Fig. 2, when the moving soil mass of the landslide begins its activity, the restraining pile bends to the valley side, the tensile force acts on the mountain side (A), and the compressive force acts on the valley side (B). Works. Generally, it is well known that hardened mortar and concrete are strong in compression and weak in tension. The strength difference is about 1/10 to 12 of the compressive strength. Therefore, the strength of mortar and concrete is
It cannot be estimated as a trial calculation condition because it loses strength due to pulling. The mortar around the pile is filled for the purpose of making it compatible with the ground, and the mortar and concrete to be filled inside the steel pipe pile are filled for the purpose of preventing corrosion of the steel pipe. In addition, the quality of the filled mortar was uncertain. The price of mortar is cheaper than that of steel, but it is uneconomical. The second point is that the structure support pile is almost the same as the deterrent pile. That is, when a rolling force is applied due to an earthquake or the like, the pile is largely deformed in the upper soft layer with the boundary between the supporting layer and the soft layer as the fulcrum. Therefore, tensile force acts on the outer peripheral side of the filling material filled in the steel pipe, cracks occur, and the strength of the filling material is lost. Therefore, the strength of the mortar filled inside and outside the steel pipe pile is not expected.

The present invention has been variously studied and tested in view of the above problems. As a means to increase pile deterrence, the strength of mortar and concrete, which are cheaper than steel materials, is used to the maximum extent to stabilize slopes such as landslides and reduce the drilling depth and diameter of boring. However, it also provides economical landslide prevention technology that can significantly reduce construction costs.

[0005]

[Means for Solving the Problems]
Think back again. When the moving soil mass of the landslide is activated, the restraint pile is deformed by the thrust from the immovable ground to the valley side and bends, and at the same time, the hardened mortar in the steel pipe is pulled on the mountain side and crack cracks occur. Loss of strength. That is, if a thrust acts on the restraining pile, the mortar or the like packed in the steel pipe acts as a force for receiving the thrust, and if there is a method of preventing deformation, the problem will be solved.

The present invention utilizes the characteristics of hardened mortar and the like to increase the deterrent force of the deterrent pile by the following method.

In this method, a filling material such as mortar filled in a steel pipe was forcedly pressurized. As a result, the deformation of the steel pipe pile was very small compared to the conventional condition in which the filler was not packed. That is, the force that pressurizes the filling acts as a deterrent.

There are two methods for increasing the depressing force of the pile by forcibly pressurizing the filling material packed inside or around the steel pipe pile (6). First, the bottom cover (10) is welded to the lower end of the restraint pile (6), and the reinforcing bars (8) are wound around the entire circumference of the steel pipe pile (6) at regular intervals and welded. A steel pipe pile (6) with a bottom cover (10) and a reinforcing bar is hung by a hoisting machine or the like and built in the boring hole (5). After the mortar (7) is filled inside or around the built-in steel pipe pile (6), and the cured mortar (7) is cured, the inner diameter of the steel pipe pile (6) is one size smaller, A method in which a steel pressure plate (11) is placed and bolts (14) and nuts (15) are tightened and pressurized from one direction on the ground surface side. The second is a method in which the mortar (7) filled in the built-in steel pipe pile (6) is sandwiched between the upper and lower pressure plates (11) connected by a tensioning member, and tension is applied from two directions. is there.

Next, the mortar and concrete (7) to be filled are manufactured in a factory or the like to produce ready-made filling concrete (29) of stable quality, which is inserted into the steel pipe pile (6). . Then, the concrete filled in the steel pipe pile is pressurized.

[0010]

Function: By pressurizing the filling material such as the mortar (7) in the steel pipe pile (6), the filling material increases the strength in the axial direction. Further, the compressive and tensile forces generated by the deformation of the steel pipe pile (6) are caused by the hardened mortar (7) filled in the outer circumference of the steel pipe pile (6) from the reinforcing bars (8) welded to the entire circumference of the steel pipe pile (6). ) Etc. and the ground wall through the hole wall, but one is that the hardened mortar (7) etc. becomes a resistor. Second, the transmitted stress is dispersed and absorbed. In addition, the filling material in which the support piles are also filled has a strength by being pressed by the overload, and the reinforcing bars laid on the outer periphery serve as a resistance body against the deformation force of the piles.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the invention will be described based on examples with reference to the drawings.

FIG. 3 is a schematic view of a restraining pile in which the filling material in the steel pipe pile is pressurized with a bolt from one direction on the surface side. First, make two circular steel plate lids (9, 10) that close both ends of the steel pipe pile (6), one is welded to the lower end of the steel pipe as a bottom lid (10), and one is in the middle of the steel plate. Process the female screw to insert the bolt. In addition, a circular steel plate for pressurization that goes inside the steel pipe
Make one sheet. Next, the steel pipe pile (6) with the bottom lid (10) is built in the boring hole, and the injection mortar (7) and the like are filled inside and outside the steel pipe pile (6). However, the filling of the mortar (7) and the like inside is done slightly lower than the mouth of the steel pipe. After curing the injection mortar (7), the pressure plate (1
1) is put on the hardened mortar (7) etc. in a steel pipe. Then, a canopy (9) having a female screw hole is welded to the upper end of the steel pipe pile (6). Rotate the bolt (14) into the screw part opened on the canopy (9), and press the pressure plate (11).
When it becomes heavy, use a torque wrench to tighten the bolt (14).
Is strongly tightened, and the hardened mortar (7) in the steel pipe is pressed through the pressure plate (11). After the work is finished, apply grease to the bolts and put a cap on them to prevent corrosion.

FIG. 4 is a schematic view of a restraining pile in which the filling material in the steel pipe pile is pressed from above and below with a thick PC steel rod and a nut. First, two circular steel plate lids (9, 10) that close both ends of the steel pipe pile (6) are made, and one is welded to the lower end of the steel pipe pile (6) as a bottom lid. Also, two circular steel plates (11) for pressurization that enter the steel pipe are made, and a steel rod (12) is formed in the middle of the steel plate.
-1) Make a hole to pass through. The thick PC steel rod (12-1) is cut short to the length of the steel pipe pile (6), and the steel rod (12-
A male screw is processed on the ground side of 1). And the steel rod (1
The lower end of 2-1) is put into the hole of the pressure plate (11) and welded.
A steel pipe pile (6) with a bottom lid (10) is built in the boring hole (5). Pressing plate (11) into steel pipe pile (6)
Remove the steel rod (12-1) attached with the steel rod (12-1)
Adjust the ground side to the center of the steel pipe and temporarily fix it to the steel pipe head. The injection mortar (7) and the like are filled inside and around the steel pipe pile (6). However, the filling of the mortar (7) and the like inside is made slightly lower from the mouth of the steel pipe. After curing the injection mortar (7), the hole of the pressure plate (11) was made into a steel rod (12-
Pass through 1) and place it on the hardened mortar (7) in a steel pipe. Insert the nut (15) into the threaded part of the steel rod (12-1) while turning it, and when it hits the pressure plate (11) and becomes heavy,
The nut (15) is strongly tightened with a torque wrench, and the hardened mortar (7) and the like in the steel pipe is pressed from above and below via the pressure plate (11). After completion of the work, grease is applied to the nut for corrosion prevention, and the canopy (9) is placed on the steel pipe pile (6) and temporarily fixed.

FIG. 5 is a schematic view of a restraining pile in which the filling material in the steel pipe pile is pressed by a thin PC steel rod and a nut from the two upper and lower directions. First, two circular steel plate lids (9, 10) that close both ends of the steel pipe pile (6) are made, and one is welded to the lower end of the steel pipe pile (6) as a bottom lid. In addition, two circular steel plates for pressurization that enter the steel pipe are made, and a thin steel rod (12-
1) Make several holes through which holes are to pass through at equal intervals. Thin PC
The steel rod (12-1) is cut short to the length of the steel pipe pile (6), and a male screw is processed on the surface side of the steel rod (12-1). Then, the lower end of the steel rod (12-1) is attached to the pressure plate (11).
Weld through the hole. A steel pipe pile (6) with a bottom lid (11) is built in the boring hole (5). Steel pipe pile (6)
Then, the steel rod (12-1) having the pressure plate (11) attached thereto is lowered, the ground side of the steel rod (12-1) is adjusted to a predetermined position, and temporarily fixed to the steel pipe head. The injection mortar (7) and the like are filled inside and around the steel pipe pile (6). However, the filling of the mortar (7) inside is made slightly lower from the mouth of the steel pipe. After curing the injection mortar (7), etc., pressurizing plate (1
The hole of 1) is passed through the steel rod (12-1) and placed on the hardened mortar (7) in the steel pipe pile (6). Steel rod (12-
Put the nut (15) into the screw part of 1) while turning it, and when it hits the pressure plate (11) and becomes heavy, tighten the nut (15) firmly with a torque wrench, and through the pressure plate (11), hardened mortar inside the steel pipe. (7) etc. are pressurized from above and below.
After completion of the work, grease is applied to the nut (15) for corrosion prevention, and the canopy (9) is placed on the steel pipe pile (6) and temporarily fixed.

FIG. 6 is a schematic view of a restraining pile which presses the filling material in the steel pipe pile from above and below in two directions by tension of PC twisted wire.
First, a circular steel plate lid (9.
Two pieces 10) are made, and one piece is welded to the lower end of the steel pipe pile (6). Further, two circular steel plates for pressurization that enter the steel pipe are processed, and a V-shaped hole through which the PC twisted wire (12-2) passes is formed at a position on the diagonal outside the pressurizing plate (11). Also, PC
The stranded wire (12-2) is cut into a length not less than twice the length of the steel pipe pile (12-2). First, pass the PC twisted wire (12-2) through the hole on one side formed in the pressure plate so that the pressure plate (11) on the tube bottom side is above the tensioner U-turn header (13). , Lead to the U-turn heter (13), make a U-turn from the PC twisted wire (12-2), and pass it through the other hole of the pressure plate (11) again. PC twisted line (12-
2) Lightly pull the 2) together and align both ends, and press the pressure plate (1
1) and the U-turn header (13) should be near the center. A steel pipe pile (6) with a bottom lid (10) is built in the boring hole (5). P that passed the pressure plate (11) and U-turn header (13) into the steel pipe pile (6)
C stranded wire (12-2) is lowered, the ground side of the PC stranded wire is adjusted to a predetermined position, and temporarily fixed to the steel pipe pile head. The injection mortar (7) and the like are filled inside and around the steel pipe pile (6).
However, the filling of the mortar (7) and the like inside is done slightly lower than the mouth of the steel pipe. After curing such as injection mortar,
Pass the PC twisted wire (12-2) through the hole of the pressure plate (11) and place it on the hardened mortar (7) in the steel pipe. Pass the PC stranded wire (12-2) through the tensioning device and apply appropriate tension with a jack to fix the PC stranded wire (12-2) to the wedge (1
6) is driven into the hole of the pressure plate (11) and PC twisted wire (12
-2) is fixed, and the hardened mortar (7) and the like in the steel pipe pile (6) is pressed from above and below via the pressure plate (11). After the work is completed, use a PC twisted wire (12-
2) and the wedges (16) are greased, and the canopy (9) is placed on the steel pipe pile (6) and temporarily fixed.

FIG. 7 is a schematic view of a restraining pile in which the filling material filled between the H-shaped steel pile and the boring hole is pressurized with a PC steel rod and a nut. First, two circular steel plates corresponding to the maximum width of the H-shaped steel pile (22) are processed, and the two circular steel plates are stacked to form the H-shaped steel pile (2
Drill a hole for passing the steel rod (12-1), avoiding the part corresponding to 2). Put one of them on the bottom of the H-section steel (22) (1
Weld 0). Another piece is cut according to the cross section of the H-shaped steel pile, and the H-shaped portion that has been cut and subdivided is removed. Thin PC
The steel rod (12-1) is cut a little longer than the length of the H-shaped steel pile. The ground side of the steel rod (12-1) is machined with a female screw, and the opposite end is welded to the hole formed in the bottom lid. H-shaped steel pile (2) with a bottom lid (10) and a steel rod (12-1)
2) is installed in the boring hole (5) and the steel rod (12-
Pass the ground side of 1) through the holes of the subdivided pressure plate, adjust the position, and temporarily fix to the H-shaped steel pile (22) head. The boring hole (5) in which the H-shaped steel pile (22) is built is filled with injection mortar (7) and the like. After curing the injection mortar (7) and the like, each pressure plate (11) is inserted through the steel rod (12-1) into the divided holes formed in each pressure plate (11).
Place on hardened mortar (7). Insert the nut (15) into the threaded part of the steel rod while turning it, and when it hits the pressure plate and becomes heavy, tighten the nut (15) firmly with a torque wrench, and cure the mortar (7) through the pressure plate (11).
Pressurize. After finishing the work, add grease to the nut and cover it with a cap.

FIG. 8 is a diagram showing the procedure for inserting ready-made filling concrete and a schematic diagram of a restraining pile for pressurizing the filling material. In order to improve the quality of mortar etc. packed in steel pipe piles and increase the deterrent force of the piles, first, in a factory or on-site, concrete (7 ), Etc., and filled with a columnar concrete (2
9) is produced. When manufacturing, a basket woven with steel wire is incorporated as required, and tapered left screws are attached at both ends for hanging the filled concrete (29). A female screw is processed at the upper end and a male screw is processed at the lower end. The length of the ready-made filling concrete (29) is set to be equal to or less than the weight of the single pipe. Therefore, there may be a plurality of ready-made filling concretes (29). However, its total length should be slightly shorter than the length of the steel pipe pile (6). Further, since the hanging metal fitting (28) for suspending the ready-made filling concrete (29) is connected to the lot (27) of the right screw used for boring the boring of the ring, the ready-made filling concrete (2
The 9) side is processed with a male left screw, and the lot (27) side is processed with a female right screw. Next, at the lower end of the steel pipe pile (6), the bottom cover (1
Weld No. 0) and build it in the hanging boring hole (5) with a winding machine. Then, the hanging metal fitting (28) is turned counterclockwise into the screw at the upper end of the ready-made filling concrete (29), and the lot (27) is put clockwise on the hanging metal fitting (28), and the built-in steel pipe pile ( In 6), a load hanging wire (26) for hoisting is hung on the hanging metal fitting of the lot (27), and the wire is hoisted down to the bottom of the pipe by a hoisting machine. Rotate the lot (27) to the right on the surface and remove the hanging fitting from the top of the ready-made filling concrete (29). When a plurality of ready-made filled concrete (29) are required, an adhesive is applied to the surfaces of both ends of the ready-made filled concrete (29) including the screw portion. After laying the ready-made filling concrete (29), the poured mortar (7) is filled inside and outside the steel pipe pile (6). However, the mortar (7) is filled a little lower from the mouth of the steel pipe. After curing the mortar (7), a pressure plate (11), which is slightly smaller than the inner diameter of the steel pipe pile (6), is placed, and a canopy (9) with a female screw cut hole for inserting the bolt (14) in the center of the steel plate. Is welded to the upper end of the steel pipe pile (6). Canopy (9)
Insert the bolt (14) into the opened screw part while turning it, and when it hits the pressure plate (11) and becomes heavy, tighten the bolt (14) firmly with a torque wrench and harden the steel pipe through the pressure plate (11). Mortar (7) etc. and ready-made filling concrete (29) are pressurized. After the work is completed, grease is applied to the bolt (14) for anticorrosion and the cap is covered.

FIG. 9 is a schematic view of a support pile that supports the foundation of a structure. In order to increase the support capacity of the support pile, first,
The pile in which the bottom lid (10) is welded to the lower end of the steel pipe pile (6) is built up to the support layer (19), and the poured mortar or ready-mixed concrete (7) is filled into the inside and outside of the steel pipe pile (6). However, the filling of the mortar (7) and the like should be done just below the mouth of the steel pipe. Next, after curing the mortar (7), etc., a pressure plate (11), which is slightly smaller than the inner diameter of the steel pipe pile (6), is placed on the steel pipe pile, and a steel pipe pile of the same size as the pressure plate (11) is placed. Place a cylinder (33) of the length shown above. And the foundation of the structure is built on it.

[0019]

[Effects of the Invention] Hardened mortar, etc. in steel pipe piles and ready-made stuffed concrete are subjected to compressive force from one direction or two directions, up and down, by tightening bolts and nuts and overloading, increasing the strength in the axial direction. To be done. Also, the mortar and the like filled in the outer periphery of the pile can obtain an appropriate strength and can be closely attached to the wall of the boring hole. As a result, the peripheral frictional force between the mortar and the steel pipe and the hole wall, and if the peripheral frictional force between the steel pipe and the hole wall is obtained.

Even if the landslide activates and the thrust acts on the restraining pile, first, the hardened mortar in the steel pipe is sealed and pressurized, so there is no place for the force to escape, and the pressurized force is reached. The pile cannot be deformed. Next, the thrust acting on the outer periphery of the restraint pile is as follows: Reinforcing bar laid on the outer periphery of the pile ⇒ Hardened mortar ⇒
It is transmitted from the hole wall to the ground, but one is that the force generated from the protruding reinforcing bars on the outer periphery of the pile is received until the compressive strength of the mortar is reached and the pile cannot be deformed. The second is that the stress transmitted through the rebar is dispersed in the ground and
It becomes a resistance against pile deformation and prevents pile deformation.

Further, the support pile is also pressed by an overload and has strength, and the reinforcing bar laid on the outer periphery serves as a resistance against pile deformation and prevents deformation of the pile.

The mortar or the like filled in the steel pipe can be applied with a force as needed any number of times later. Even if a crack is formed at a certain position, since the force is constantly applied to the crack surface, it cannot be deformed until the tensile force of the deterrent force + the pressing force is reached. Therefore, the filling material packed in the steel pipe is
If the deformation of the pile does not change the volume, it is not necessary to stick to the cement hardening substance that solidifies.

As described above, since the pile shape can be reduced by the increase of the deterrent force of the pile provided with them, the drilling depth and bore diameter of the boring are also reduced, so the construction cost is reduced. It can be greatly reduced.

[Brief description of drawings]

FIG. 1 is an overall sectional view of a restraint pile installed to prevent landslides.

FIG. 2 is a cross-sectional view of the restraining pile installed to prevent landslides from rising.

FIG. 3 is a schematic view of a restraint pile in which a filler in a steel pipe pile is pressurized with a bolt from one direction on the ground surface.

[Fig. 4] Fill the steel pipe pile with a thick PC from top and bottom two directions.
The schematic diagram of the suppression pile which pressurizes with a steel rod and a nut.

[Fig. 5] Filling the steel pipe pile with a thin PC from the two upper and lower directions.
The schematic diagram of the suppression pile which pressurizes with a steel rod and a nut.

FIG. 6 is a schematic view of a restraint pile that presses the filling material in the steel pipe pile from above and below in two directions by tension of PC twisted wire.

FIG. 7 is a schematic diagram of a restraining pile in which the filling material on the side of an H-shaped steel pile is pressed with a PC steel rod and a nut.

[Fig. 8] Fig. 8 is a diagram showing a procedure for inserting ready-made medium-filled concrete and a schematic diagram of a restraint pile for pressurizing the filling material.

FIG. 9 is a schematic diagram of a support pile that supports a foundation of a structure.

[Explanation of symbols] 1, surface 18, stratum boundary 2, slipping slip mass 19, support layer 3, slip surface 20, cylinder 4, immovable ground 21, moving direction of thrust slip mass (5), boring hole 22, H-shaped steel Pile 6, Steel pipe pile 23, Tensile force 7, Injection mortar or concrete 24, Compressive force 8, Reinforcing bar 25, Suspending wire 9, Canopy 26, Loading wire 10, Bottom lid 27, Lot 11, Compression plate 28, Hanging metal fitting 12 , Pressure and tension member 29, ready-made filling concrete 12-1, PC steel rod 30, filling hose 12-2, PC stranded wire 31, superstructure 13, U-turn heter 32, welded portion 14, bolt 33, column. 15, nut A, expansion side 16, wedge B, compression side 17, soft layer

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 8]

[Figure 7]

[Figure 9]

Claims (4)

[Claims] 1. A PC-deformed steel rod 12-on a bottom lid 10 of a steel pipe pile 6.
1 is welded, the upper side of the deformed steel rod 12-1 is passed through the hole of the compression plate 11, the compression plate 11 is placed on the hardened concrete 7, and the tightening nut 17 is turned on the deformed steel rod 12-1. The nut 17 is tightened with a torque wrench to pressurize the compression plate 11. 2. A plurality of PC deformed steel rods 12-1 are welded around a bottom lid 10 of a steel pipe pile 6 and the upper side of the deformed steel rods 12-1 is passed through a hole of a compression plate 11 to cure hardened concrete 7. Place the compression plate 11 on top, and tighten the nut 17 on the deformed steel bar 12-1.
And tighten the nut 17 with a torque wrench to pressurize the entire compression plate 11. 3. A pulling member U-turn heter 16 is attached to the bottom lid 10 of the steel pipe pile 6 by welding or the like. Then, the PC twisted wire 12-2 etc. covered with the sheath material is used for the U-turn header 1
Pass through 6 and pull to the top of the restraint pile 6, and twist the PC stranded wire 12-2.
Strip the sheath material at the tip of the plate through the hole of the compression plate 11, place the compression plate on the hardened concrete 7, and tighten the wire 12-2 from the PC with a jack to press the compression plate 11 and wedge 18 Fix with. 4. A PC-shaped steel bar 1 around the bottom lid 10 of an H steel pile.
2-1 is welded, and the upper side of the deformed steel bar 12-1 is compressed plate 11
After passing through the hole of No. 3, placed on the hardened concrete 7, the tightening nut 17 is turned into the deformed steel rod 12-1, and the nut 17 is tightened with a torque wrench to pressurize the compression plate 11.