JP2001342624A - Rotary jacked pile, method for burying rotary jacked pile, and foot protection method for for the rotary jacked pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for burying a rotary jacked pile and the rotary jacked pile capable of reducing rotation torque of the pile without loosening support ground and strengthening it further, without loosening side wall ground and the support ground. SOLUTION: This rotary jacked pile consists of an excavation blade 3 provided at a tip of a hollow pile main body 2 and an injection port 6 provided in a scope of a hollow part of the pile main body 2 of the excavation blade 3 to inject a fluid into the ground so that rotation resistance is reduced while the fluid is injected into the ground from the injection port 6 and the pile can be pressed into the ground while rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of rotating a press-fit steel pipe pile by extruding a fluid such as water into an excavated portion to reduce excavation resistance, or excavating a hardened fluid such as grout material. The present invention relates to a rotary press-fitting pile that spills out into the ground to strengthen the ground such as consolidation, a method of burying a rotary press-fitting pile, and a method of solidifying a rotary press-fitting pile.

[0002]

2. Description of the Related Art There are the following prior arts. (1) In Japanese Patent Application No. 61-246421 (foundation construction method), a vertical hole is built in advance, and a pile with a spiral collar is rotationally press-fitted. (2) In Japanese Patent Publication No. 4-58850 (Title of Invention: Method of burying steel pipe pile), a spiral blade (wing) composed of substantially one turn is provided on the lower side of the closed-end steel pipe pile main body, and the bottom plate is provided with a downwardly facing spiral blade. A rotary press-fitting pile provided with a plurality of excavating blades and an ejection port for ejecting grout material to the bottom plate is disclosed. (3) In JP-A-10-219687 (Title of Invention: Steel pipe pile burying device and steel pipe pile used for them),
A spiral blade of approximately one turn is provided on the lower side of the open-ended steel pipe pile body, and a discharge port for discharging a foaming agent to a root portion (pile side portion) of a tip portion and a rear end portion of the spiral blade is provided. A rotary press-fitting pile provided with a supply pipe for supplying a foaming agent lowered into the pile body at the discharge port is disclosed. (4) Japanese Unexamined Patent Publication No. Hei 7-189249 (embedding method of inverted conical multi-blade steel pipe pile) has almost the same configuration as Japanese Patent Publication No. 4-58850, but the diameter is increased at a constant ratio toward the top. The wings are provided in multiple stages. (5) In Japanese Patent Application Laid-Open No. 11-222854 (Title of Invention: Construction method of screwed steel pipe pile), a drilling blade formed by displacing two steel plates on the lower side or end of a steel pipe pile main body so as to be shifted. Are provided to form an open-end pile or a closed-end pile, and a grout material is ejected from the side of the pile main body or the center of the bottom.

[0003]

The prior art described above has the following problems. (1) According to the technique disclosed in Japanese Patent Application No. 61-246421, residual soil is generated when a vertical hole is excavated. Disposal of this surplus soil is troublesome and expensive. In addition, as a preparation before injecting air mortar or the like, it is necessary to pass a pipe through the upper part of the pile and close it with reinforced concrete or steel plate, which makes the operation complicated and poor in workability. When the rubber tube is not used, the injected air mortar is diffused into the ground, which has an adverse effect on the environment.

[0004] (2) The technique disclosed in Japanese Patent Publication No. 4-58850 is to allow a fluid such as grout material to be ejected from the bottom plate, but the tip of the pile is closed by the bottom plate. For this reason, the torque when penetrating into the ground becomes larger than that of the open-end pile, and the workability is poor. In addition, apart from the bottom plate, spiral wings of almost twice the outer diameter of the pile body are attached to the outer peripheral surface,
The degree of processing is high as a pile material. In addition, since the spiral blade is configured to be provided on the outer side above the ejection port, earth and sand excavated by the excavating blade of the bottom plate and the fluid material are stirred and mixed, and the mixed fluid material goes to the spiral blade, It does not reach the entire area of the spiral blade, and the effect of reducing the excavation resistance of the ground of the spiral blade cannot be expected. This prior art,
It is intended to consolidate, but the consolidation is also performed by moving up and down while rotating, so it rises in reverse,
It is a movement that penetrates with forward rotation (it is impossible to move up and down while maintaining forward rotation or reverse rotation because the load on the construction machine becomes extremely large), and mixing with the surrounding soil is not enough, The quality of soil cement does not improve.

(3) The technique disclosed in Japanese Patent Application Laid-Open No. 10-219687 is to provide a discharge port at the base of the excavating blade of the spiral blade provided on the side of the pile body at the pile side. This is because the blowing agent spouted from the discharge port follows the side wall of the pile body that rotates together with the earth and sand excavated by the excavation blade, and reaches the entire excavation blade before (almost no reach). It is driven backward, and the effect of reducing the excavation resistance of the ground of the spiral blade is low. When a foaming liquid is used, it is a special material as compared with water, air, or the like, and a hardening agent cannot be injected into a halfway wall ground or a pile tip ground to strengthen the ground.

(4) Japanese Unexamined Patent Publication No. Hei 7-189249 (Buried method of inverted conical multi-wing steel pipe pile) is disclosed in Japanese Patent Publication No. 4-58885.
Although it has the same problem as No. 0, providing the blades in multiple stages increases the cost very much. (5) The technique disclosed in Japanese Patent Application Laid-Open No. 11-222854 is to provide an ejection port at the center of the bottom of a pile and eject a fluid object directly downward, which is the prior art of (2) described above. It has the same problem as. In addition, since the blade is flat, the direction of the reaction force received from the ground has an angle with respect to the penetration direction of the pile from the leading end to the trailing end of the blade. This indicates a decrease in penetration efficiency. In addition, since the blade is flat, it is impossible for the blades to pass through the same orbit when penetrating, so that the surrounding soil is damaged accordingly, and the degree of damage is greater than that of the spiral blade.

[0007] There are other methods of burying piles other than the above prior art, but the problems common to these methods of burying and consolidating piles are as follows. 1. The remaining soil (waste soil) corresponding to the replacement of the hardened material that becomes the pile and the ground is generated. 2. Since the supporting ground surface is excavated and destroyed by the auger, even if the strength of the hardened body can be secured, the excavated soil is removed as remaining soil, so that the supporting ground itself supporting the pile and the hardened body is loosened. 3. The excavated soil is removed, and the hardened material and the soil cannot be mixed into the midway side wall ground to strengthen the midway side wall ground. In order to remove excavated soil, it requires a large amount of hardened material to form a hardened body,

[0008] 5. The use of a hardening material with a high hardening rate is difficult to use if two types of members are mixed and the hardening material is supplied from the ground because the hardening of the ground material proceeds. For this reason, it is limited to the use of a hardening material having a long hardening time, and the working period becomes long. In the case of cleaning for eliminating clogging of a supply pipe or a nozzle, a cleaning agent such as cleaning water is discharged from the supply pipe to the excavated ground, so that cleaning is very difficult. 7. Since the bottom plate and the bottom plate are provided with a digging blade and a spout, the bottom plate and the digging blade and the mounting cost thereof are increased,
Further, since the spiral blade is provided on the side of the pile main body, the processing accuracy is extremely high, and the manufacturing cost is increased. And so on.

The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to greatly reduce the excavation torque (rotation torque of the pile).
Another object of the present invention is to provide a rotary press-fitting pile, a method of embedding the rotary press-fitting pile, and a method of solidifying the rotary press-fitting pile, which can obtain a good mixture of hardened material, excavated earth and sand.

[0010]

To achieve the above object, the present invention is as follows. <Invention of a rotary press-fit type pile according to claim 1> A hollow pile main body, an inner blade portion abutting on the tip of the pile main body and protruding inside the pile main body and an outer blade protruding outwardly from the pile main body. And an excavating blade provided at the tip of the spiral-shaped excavating blade, which is formed integrally with the excavating portion and provided so as to make the pile body an open-ended pile, and an excavating blade provided at the tip of the excavating blade. In order for the fluid to reach the tip of the pile, a fluid outlet provided at the bottom of the excavating blade and the fluid ejected from the outlet, such as air, liquid, powder, and grout material, are discharged from the ground or the like. And a supply pipe provided in the pile main body for supplying. “Spout” is a concept including ejection, pouring, and the like. By ejecting air, liquid, or the like, the rotation torque can be reduced, and by ejecting grout material or the like, the ground can be strengthened. “Spout” is a concept that includes a spout nozzle. The “pile tip” is a tip including an excavating blade, near the spiral blade abutted on the tip of the pile main body, and refers to a portion substantially above the lower end of the blade by the blade pitch. Therefore, the fluid is ejected directly to the excavation blade and the ground immediately before excavation. The "wings" are attached to the tip of a pile, are made of a spiral steel plate, and excavate the ground while rotating. The diameter is about 1.2 to 3.0 times the diameter of the steel pipe. Having. It is in contact with the steel pipe pile tip opening from below,
It is different from the one connected to the side of the pile. "The pile body is provided as an open-end pile" means that the blades do not cover almost all of the opening at the tip, but cover the excavation performance of the open-end pile to the extent that it can be maintained. Say.

<Invention of a rotary press-fit type pile according to a second aspect> The excavating blade according to the first aspect is characterized in that a part thereof is formed by being bent into a polygonal shape. The excavation blade attached to the tip of the spiral blade is generally formed straight, but in the present invention, in particular, a part of the excavation blade is formed in a triangular shape or a square shape, etc. By forming it by bending, the excavated earth and sand can be easily discharged.

<Invention of a rotary press-fit type pile according to a third aspect> The jet port according to the first aspect is provided on the rear end side or the front end side of the excavating blade, or on the rear end side and the front end side. I do.

<Invention of a rotary press-fit type pile according to claim 4> The structure of the ejection port of the invention according to claim 1, 2, or 3 is such that the ejection port has a structure in which fluid is uniformly mixed with the excavated ground. A plurality of nozzles are provided radially so as to be able to stir.

<Invention of a rotary press-fit type pile according to claim 5> A hollow pile main body, an excavating blade provided at the tip or side of the pile main body, and a fluid provided outside the pile main body below the pile main body. An outlet for ejecting an object, and a supply pipe provided in the pile main body for supplying a fluid object such as air, liquid, powder, grout material, etc. ejected from the outlet from the ground or the like. It is characterized by the following.

<Invention of a rotary press-fit type pile according to a sixth aspect> An auxiliary pipe having the structure according to the fifth aspect of the present invention is provided with an opening at the side of the spout or at the lower side of the supply pipe. It is characterized by being joined to.

<Invention of a rotary press-fit type pile according to claim 7> The jet outlet of the invention according to claim 1, 2, 3, 4, 5, or 6 is provided on the inner blade. And

<Invention of a method for burying a rotary press-fit type pile according to claim 8> A hollow pile main body, an inner blade portion abutting on the tip of the pile main body and projecting inside the pile main body and an outer side And a substantially one-turn spiral-shaped excavating blade integrally formed with an outer blade portion projecting from the excavating blade and provided so as to make the pile main body an open-ended pile, and excavation provided at a tip of the excavating blade. A blade, a fluid substance ejection port provided at the bottom of the excavation blade, and air, liquid, and powder ejected from the ejection port so that the ejected fluid substance reaches the entire area of the tip of the pile including the excavation blade. A rotary press-fit type pile comprising a supply pipe provided in the pile main body for supplying a fluid substance such as a body and a grout material from the ground or the like; It is characterized by being buried under pressure while spouting from

<Invention of a method for embedding a rotary press-fit type pile according to claim 9> In the invention according to claim 8, a fluid material made of a hardening material such as grout material is rotationally press-fitted while jetting from a jet port. It is characterized by strengthening the ground by going.

<Invention of a method for solidifying a rotary press-fit type pile according to claim 10> A rotary press-fit type pile according to claim 1, 2, 3, 4, 5, 6, or 7 is rotated when embedded. During the press-fitting burial, a fluid substance is appropriately ejected from the jet port to excavate, and in the final embedding stage, a curable fluid substance such as a curable grout material is ejected to form a solid body on the ground below the excavation blade. It is characterized by strengthening the pile tip ground. The “final burial stage” means: 1. Hitting the pile and squirting hardened material. 2. After penetrating, reversely rotate and pull up to some extent to eject hardened material. 3. Rotate the pile into the pile while squirting the hardening material shortly before the stop. 4. Stop the pile, spout out the hardening material, fill the ground under the pile with the hardening material to form a mixing part of hardening agent and earth and sand, and rotate and press the pile halfway while stirring the mixing site. This includes various conditions such as stopping the penetration of the pile and ejecting the curing agent while rotating the pile. The term “appropriately” of “appropriately ejecting the fluid from the ejection port during the rotary press-fitting embedding” means “when ejecting from the beginning to the end, when ejecting water at the time of press-fitting the intermediate layer, When water is ejected at the time of press-fitting, when fluid is not ejected when digging a weak ground layer, or when digging while blasting air when digging a weak ground layer, or when grout material is also ejected. It is a meaning including.

<Invention of a method of constructing a rotary press-fit type pile according to claim 11> The rotary press-fit type pile according to claim 6 is buried by rotation,
After striking a predetermined stratum, air or cleaning water is pumped from the auxiliary pipe to wash the inside of the supply pipe and the auxiliary pipe, and the supply pipe and the auxiliary pipe are removed from the jet port and collected on the ground. Features.

[0021]

Embodiments of the present invention will be described with reference to the drawings. <Embodiment 1> FIG. 1 is a schematic view of a rotary press-fitting and burying apparatus according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view showing a jet port of Embodiment 1 of the present invention, and FIG. FIG. 4 is a front view showing the supply support head, FIG. 4 is a plan view of a fixed bracket part of the supply support head according to the first embodiment, and FIG.

The rotary press-fit type pile 1 is as follows.
A pile main body 2 made of a hollow steel pipe, and a bottom opening 5 (see FIG. 1) provided at the bottom of the pile main body 2 so as to be press-fitted into the ground while rotating while being provided in contact with the lower end of the pile main body 2 The inner blade portion 18 and the inner blade portion 18 located inside the pile main body 2 so as to leave the pile as an open-end pile) to some extent.
The excavation blade 3 is formed integrally with the outer periphery of the pile main body 2 and is formed of a substantially single-turn spiral blade composed of the outer blade portion 19. An ejection port 6 for ejecting the fluid 14 is provided at the bottom of the inner blade portion 18 (located below the excavating blade 4).
a is provided at the rear end side (located above the excavating blade 4) of the inner blade portion 18 at the bottom thereof, and an ejection port 6b for ejecting the fluid 14 is provided. The ejection ports 6a and 6b are provided with piles. Body 2
Supply pipe 7 for sending fluids plumbed from the ground
7 is connected. The supply pipes 7, 7 are
And a supply support head 9 having a supply distribution source pipe 8 for supporting a fluid substance to the supply pipes 7 and 7 at the upper portion of the pile main body 2.

In FIG. 2, the jet port 6 is provided with the inner blade 1.
8, an ejection port body 11 fixed inside the ejection port 10 so that an edge of the ejection port 10 remains inside, and a compression coil spring housed in the ejection port body 11. 12 and a through hole 15 through which fluid is passed, provided so as to close the ejection hole 10 by the compression coil spring 12.
The valve 13 is normally lifted by a compression coil spring 12 to cover the ejection hole 10 from below, and the valve 13 is normally lifted by a compression coil spring 12. The fluid object 14 is pressed downward by the pressure of the fluid object 14 that is press-fitted and supplied, whereby the ejection hole 10 is opened, and the fluid object 14 is ejected to the ground.

3 and 4, the supply support head 9 includes a cross-shaped fixing bracket 20 for fixing the supply support head 9 to the head of the pile main body 2, and a lower central portion of the fixed bracket 20. A supply / distribution source pipe 8 for distributing and supplying a fluid material to supply pipes 7, 7 fixed to the fixed bracket part 20 and branched into a forked pipe, and a fluid material supply pipe 8 at the upper center of the fixed bracket part 20. And a main pipe connecting part 22 having a rotary connecting part 21 in communication with the main pipe connecting part 22 and a main pipe 23 connected to the main pipe connecting part 22. The fixed bracket section 20 includes four arms 24, 24, 2, 2 arranged on a cross.
4, 24, a stand adjusting and fixing portion 26 for adjusting the mounting position of a stand 25 formed in a long hole shape on the upper part of the arm 24 and suspending and fixing the stand 25 with fixing bolts 28; Piled mounting fixing part 2 that has fallen
7 and a fixing bolt 28 for fixing the pile mounting fixing portion to the edge of the head of the pile main body 2. As will be described later in a second embodiment, all or a part of the supply pipe 7 can be separated and recovered as a recovery pipe after the pile is buried so that it can be reused.

In FIG. 5, STEP 1 puts the entire swivel casing jack 30 on the ground at the pile driving position. STEP2 Supply hose 3 connected to main pipe 23 by auxiliary crane 34
The rotary press-fitting burying device 1 with the hanging 1 is lifted, and the pile is built, chucked, and the standing of the pile is adjusted. (Step 3) The entire swivel casing jack 30 is operated to rotationally press the pile main body 2 into the ground. After burying an appropriate portion (such as reaching the intermediate layer), the fluid supply device 32 is connected to the supply hose 31. (Step 4) A fluid material (generally, air or water) is supplied from the fluid material supply device 32, and the jet torque is reduced while ejecting (spraying) the ground, and the pile body 2 is rotationally pressed into the ground. (Step 5) When the fluid reaches the predetermined support base, the fluid supply device 32 is changed to the fluid supply device 33, and a fluid made of cement paste is injected under pressure into the support base to fix the tip. This execution step is an example, and various modes can be performed depending on the state of the ground, the execution target, and the like. In the following description of the embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

<Embodiment 2> FIG. 6 is a schematic sectional view and a plan view showing a lower portion of a rotary press-fit type pile according to Embodiment 2 of the present invention, and FIG. FIG. In the rotary press-fit type pile 40, in addition to the configuration of the rotary press-fit type pile 1, an air vent hole 44 is provided in a portion of the supply pipe 42 which is next to the valve body 43, and the air vent pipe 41 is joined to the air vent hole 44. I do. The air vent pipe 41 vents a highly viscous fluid such as a grout material to prevent a bubble portion from being formed in a solidified body to be formed. Further, a fluid object or soil adhering to the jet port or the supply pipe is washed to realize a device with high use efficiency. Further, at the time of recovery, the supply pipe is washed. Further, a socket 46 for connecting the collection pipe 45 is provided at an appropriate position above the supply pipe 42, and a collection socket 47 is also provided at an appropriate position above the air vent pipe 41. After excavation and consolidation are completed, the collection pipe 45 and the air release pipe 4 are
1 is removed from the lower part, collected, and reused.

The injection port 48, which is an injection nozzle, includes a valve body 43 having a head portion 49 having a substantially conical shape, a body portion 50 below the head portion 49, and a plate-shaped valve portion 51 below the body portion 50. ,
Compression coil spring 12 inserted into body 50 of valve body 43
And a supply pipe bottom closing plate 53 having an ejection hole 55. The compression coil spring 12 is provided inside the ejection hole 55 with the valve portion 5.
The supply pipe bottom closing plate 53 is fixed to the bottom of the supply pipe 42 so as to cover the bottom, and the lower end of the supply pipe 42 is fixed on the ejection hole 10 of the excavating blade 3. Has become.

<Embodiment 3> FIG. 8 is a sectional view showing an ejection port according to Embodiment 3 of the present invention. Rotary press fit pile 60
Is an elastic valve element 61 made of a plate rubber member or the like instead of the valve element 43 of the rotary press-fit type pile 40, and forms an ejection port 63. The base of the valve element 43 is fixed by bolts 62, and the ejection hole 10 is closed by its own elastic force.

<Fourth Embodiment> FIG. 9 is a front view showing a rotary press-fitting pile according to a fourth embodiment of the present invention, FIG. 10 is a bottom view of the rotary press-fitting pile according to the fourth embodiment, and FIG. FIG. 12 is a central longitudinal sectional view showing the structure of a jet port according to the fourth embodiment. FIG. 12 is a plan view showing a water jet nozzle cap according to the fourth embodiment.
FIG. 13 is a plan view of the air ejection nozzle cap according to the fourth embodiment. The rotary press-fit type pile 70 has a configuration in which the spout 71 is provided on the tip side of the inner blade 18 behind the excavating blade 4 and the spout is not provided at the rear end of the inner blade 18. Has the same configuration as the rotary press-fit type pile 1. 100 is the ground. The spout 71 is the inner blade 1
8 is screwed into the female screw 82 with a male screw 72, and the lower portion of the inner blade 1
The cap nozzle 75 has a suitable number of nozzles 74 and is fixed so as to project to the bottom side.
And a tapered screw portion 7 provided outside the upper portion of the valve portion 73.
6, a reducer 78 (left-hand screw) for screwing and connecting the supply pipe 7 to the upper female screw 77;
And a hexagon nut 79 for fixing the reducer 78.

Inside the valve portion 73, an upper ring portion 80 and a lower ring portion 81 having openings at appropriate intervals above and below are provided.
The valve body 43 is provided between the upper ring portion 80 and the lower ring portion 81 so as to be able to move up and down so as to be pushed upward by the repulsive force of the compression coil spring 12, and in this state, the upper ring portion 80 is provided. The opening of the lower ring portion 81 is closed by the valve body 43. When the fluid is pressed downward from the supply pipe 7, the pressure causes the valve body 43 to move downward, and a gap is formed in the openings of the upper ring portion 80 and the lower ring portion 81, and the fluid is discharged from the gap. It flows and is injected from the nozzle 74 in the rotation direction of the pile. The main ejection port 70 is attached (can be removed) from the bottom opening 5.
Can be performed, and the supply pipe can be recovered by turning the supply pipe to release the screw engagement.

In FIG. 12, the cap nozzle 75a
The female screw 83 is threaded on the inside of the cap body 84, and the nozzles 74, 74 for ejecting the liquid to the side are provided slightly downward and at an angle of about 20 degrees. I have. Needless to say, the number of the nozzles 74 and the number of the nozzles are appropriately determined according to the ground and the construction. In some cases, the valve portion can also be collected.

In FIG. 13, the cap nozzle 75b
Has a female screw 83 threaded inside the cap body 84, and nozzles 85, 8 for jetting air to the side.
5, 85 are downwardly provided at an angle of about 20 degrees.

<Fifth Embodiment> FIG. 14 is a front view showing a rotary press-fit type pile according to a fifth embodiment of the present invention, and FIG. 15 is a bottom view of the rotary press-fit type pile according to the fifth embodiment. The rotary press-fit stake 88 has the same structure as the rotary press-fit stake 70, but also
8 is also provided at the rear end side (above the front of the digging blade 4) of the digging blade 4 so that fluid from each nozzle is jetted toward the digging blade 4 and The whole thing is to go.

In each of the embodiments, since the excavating blades are provided inside and outside the pile main body, the pile using the inner excavating blades is different from the conventional example in which the excavating blades are attached only to the outside of the pile main body. Excavation of the inner soil can also be performed, so that the excavation performance is greatly improved. The excavation blade at the tip of the spiral blade is formed to be bent from the inside to the outside at an escape angle near the outer periphery of the steel pipe pile. With this configuration, even if a fluid object goes inside the excavation blade, part of the excavated earth and sand flows outward along the excavation blade in the relief configuration, so that a part of the fluid object is also removed. The fluid flows outward with the earth and sand, and the fluid spreads over the entire excavation blade. In addition, the solid ground before excavation is softened by the ejected fluid, and the excavation blade penetrates there, so that the excavation of the ground progresses easily and the excavated earth and sand can be easily discharged .

[0035]

As described above, the present invention has the following effects. <Effects of the invention of the rotary press-fit type pile according to claim 1> The present invention provides a method of manufacturing a rotary press-fit type pile according to the present invention. Since the ejection port is provided (upper and rearward than the excavation blade), the following effects are obtained. Because the helical drilling blade is in contact with the bottom of the pile body,
By ejecting the fluid material toward the excavation blade, the excavated earth and sand and the fluid material can be mixed and agitated, so that the fluid material can reach the entire tip of the pile.

This allows the fluid to reach the entire tip of the pile, greatly reducing the excavation resistance (rotational resistance of the pile), and evenly spreading the fluid to the entire soil excavated by the excavation blade. Because it can be mixed, it is possible to form a high-quality mixed ground with one burial promotion,
The construction efficiency can be improved. In addition, since it is a configuration having excavation blades on the inside and outside of the pile main body, it also performs excavation of earth and sand inside the pile by the inside excavation blade,
In this respect, the rotational resistance of the pile can be reduced as compared with the closed-end pile or the simple open-end pile, and a rotary press-fit pile having a lower rotational resistance can be realized. In addition, since the spiral drilling blade is in contact with the bottom of the pile main body, there is no need for a bottom plate, and there is no need for high precision workability such as attaching the spiral blade to the side of the pile. Can be reduced.

<Effect of the invention of the rotary press-fitting type pile according to the second aspect> In addition to the effect of the first aspect, the configuration of the excavating blade is such that a part of the excavating blade is excavated by the excavating blade. The excavated soil is angled so that the excavated soil can escape from the inside to the outside, so even if fluid goes inside the excavation blade, part of the excavated soil flows outward along the excavation blade. As a result, a part of the fluid material flows outward together with the earth and sand, and the fluid material spreads over the entire tip of the pile.

<Effect of the invention of the rotary press-fit type pile according to claims 3 and 4> In addition to the effect of the invention according to claim 1 or 2, the jet port is provided on the rear end side located above the excavating blade. Therefore, the excavated sediment above the excavation blade and the ejected fluid are mixed and agitated, and the effect of reducing the excavation resistance and realizing uniform mixing of the fluid and excavated earth and sand is achieved. In this case, the jetting direction may be either forward or rearward, but it is easier to obtain a uniform spread of the fluid object because the jetting toward the rear expands the space, and whether the earth or sand hits the jet outlet. Since it is weak even if it hits, it is difficult to cause damage to the ejection port, which is preferable. In addition, when the jet port is provided at two places on the tip side and the rear end side of the excavating blade, excavation is performed while applying fluid to the earth and sand where the fluid material has penetrated and flowed easily from the jet port on the rear end side. It is possible to excavate with a blade, and the effect of further reducing the rotational resistance of the pile and realizing a more uniform mixing state is achieved.

By forming a plurality of nozzles radially so as to radially eject the fluid material over a wide area, the fluid material can be permeated into a wider area including the entire excavation blade, and can be mixed or mixed. Since the agitation can be performed, the entire excavation blade is in a state in which the fluid material is distributed, so that the rotation resistance of the pile can be further reduced, and the effect of realizing better quality mixing of the earth and sand and the fluid material is achieved.

<Effect of the invention of the rotary press-fit type pile according to claim 5> An ejection port is provided below the pile main body, and air,
It is a component for supplying a fluid material such as liquid, powder, and grout material from the ground, and has an effect that the fluid material can be sent from the ground to the tip of the pile.

<Effect of the invention of the rotary press-fit type pile according to the sixth aspect> An opening is provided at the lower side of the supply pipe or at the side of the outlet, and the opening is used for venting air and cleaning the outlet. Since the auxiliary pipe is joined, after the fluid is ejected, the cleaning liquid is sent from the auxiliary pipe and collected from the supply pipe (the cleaning liquid is sent from the supply pipe and collected from the auxiliary pipe). It has the effect that cleaning can be performed without releasing cleaning liquid into the pile or inside. Also, by mixing two types of ingredients, a hardening agent with a high hardening speed is separately sent from the auxiliary pipe and the supply pipe while maintaining the mixing ratio, and mixed immediately before and immediately after jetting, so that the hardening material is mixed. It can be formed, and has an effect that the construction period can be shortened by adopting a pre-cured material.

<Effect of Invention of Rotary Press-Fit Pile According to Claim 7> In addition to the effects of the invention described in claims 1, 2, 3, 4, 5, and 6, a jet port is provided on the inner blade portion. Therefore, the supply pipe can be connected straight to the ejection port in the pile main body, so that the production is easy and the production cost can be reduced.

<Effects of the invention of the method for burying a rotary press-fit type pile according to the eighth and ninth aspects>
The use of the rotary press-fitting pile according to the invention described in 6, 7 has the following effects. (1) In the middle ground layer or the whole burial process, it is possible to advance the press-fitting burial by reducing the rotational torque of the pile while spouting water or the like when necessary. Further, since the excavated and stirred soil is pushed into the side of the pile, a construction method is realized in which the ground of the side wall of the pile is strengthened and no residual soil (waste soil) is generated without loosening the ground. (2) In soft ground, etc., a mixture of soil and hardened material is pushed into the side wall of the pile by forcibly ejecting a fluid material made of hardened material such as grout material into the ground and pushing it into the ground. Realize a method of compacting and strengthening soft ground. (3) At the final stage of burial, stop the pile and eject the hardened material, stop the pile and eject the hardened material to some extent, and rotate and press-in the pile while ejecting the hardened material shortly before the stop. Stopping the pile, squirting the hardening material, filling the ground under the pile with the hardening material to form a solidified bulb pile, and rotating and press-fitting the pile halfway into the solidified bulb to remove the remaining soil without loosening the ground. A method for creating various solidified bodies (supports) that do not come out and a method for strengthening the support base are realized. The support base (solidified body) formed under the pile has a thickness equal to or larger than that of the blade, and realizes a stable supporting force by a support base much larger than the thickness of the pile main body.

(4) Since the ground is compacted by the amount of the pile body without generating waste soil, the use of a hardening material is reduced and the cost is reduced. (5) Since the pile is buried while ejecting the fluid to the ground, the press-fitting is performed while loosening the ground with the fluid, so that the rotational press-in torque can be greatly reduced. Can be used and can be miniaturized. (6) It is possible to build an extremely excellent pile as a whole, thereby realizing cost reduction.

<Effect of the invention of the method for consolidating the rotary press-fitting pile according to the tenth aspect> In addition to the above effects, the entire ground is solidified so as to cover the entire area around the tip of the rotary press-fitting pile. This has the effect of forming an extremely solid ground. This is a very effective method for strengthening the ground where there is a lot of soft ground.

<Effect of the invention of the method for constructing a rotary press-fit type pile according to the eleventh aspect> By cleaning the supply pipe and the auxiliary pipe by using the auxiliary pipe, it is possible to limit the intrusion of extra fluids into the tip. The quality of the tip rooting part can be secured,
In addition, by collecting the supply pipe and the auxiliary pipe, the pipe can be diverted many times, and the cost of the rotary press-fitting pile can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a rotary press-fitting burying device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a jet port according to the first embodiment of the present invention.

FIG. 3 is a front view showing a supply support head unit according to the first embodiment of the present invention.

FIG. 4 is a plan view of a fixing bracket of the supply support head according to the first embodiment of the present invention.

FIG. 5 is a process chart of embedding a pile according to the first embodiment of the present invention.

FIG. 6 is a schematic sectional view and a plan view showing a lower portion of a rotary press-fitting pile according to Embodiment 2 of the present invention.

FIG. 7 is a cross-sectional view showing an ejection port and a supply pipe according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating an ejection port according to a third embodiment of the present invention.

FIG. 9 is a front view showing a rotary press-fit type pile according to a fourth embodiment of the present invention.

FIG. 10 is a bottom view of the rotary press-fit type pile according to the fourth embodiment of the present invention.

FIG. 11 is a central longitudinal sectional view showing the structure of the ejection port of the present invention.

FIG. 12 is a plan view showing a water ejection nozzle cap of the present invention.

FIG. 13 is a plan view of the air ejection nozzle cap of the present invention.

FIG. 14 is a front view showing a rotary press-fitting pile according to a fifth embodiment of the present invention.

FIG. 15 is a bottom view of the rotary press-fit type pile according to the fifth embodiment of the present invention.

[Description of Signs] 1 ... Rotation press-fit type pile 2 ... Pile body 3 ... Drilling blade 4 ... Drilling blade 5 ... Bottom opening 6a ... ··· Spout port 6b ··· Spout port 7 ···· Supply pipe 8 ····· Supply / distribution source pipe 9 ···· Supply support head section 10 ····· Spray hole 11 ································································································· · Valve portion 18 ······ Inside blade portion 19 ········· Outer blade portion 20 ········································ Rotation connection portion 22 ···························· ..... Main pipe 24 ......... Arm 25 ......... Stand 26 ......... Stand adjustment fixing part 27 ........ Pile mounting fixing part 28 ... Fixing bolt 30 Full swing casing jack 31 Supply hose 32 Fluid supply device 33 Fluid supply device 34 Auxiliary crane 40 .... rotating intrusion pile 41 ----- air vent pipe 42 ----- supply pipe 43 ----- valve body 44 ----- air vent hole 45 ..... recovery pipe 46 ····· Socket 47 ······ Socket 48 ··················································································· ···· Recovery pipe 53 ····· Supply pipe bottom bottom plate 55 ·································· Rotation press-fit type pile 61 ························ Bolt 63 ······························· Rotating press-fit type pile 71. ·······················・ Valve part 74 ・ ・ ・ ・ ・ ・ Nozzle 75 ・ ・ ・ ・ ・ ・ Cap nozzle 75a ・ ・ ・ ・ ・ ・ Cap nozzle 75b ・ ・ ・ ・ ・ ・ Cap nozzle 76 ・ ・ ・ ・ Tapered screw part 77 ・ ・ ・ ・ ・ ・ Female screw 78 ······ Reducer 79 ······ Hexagon nut 80 ·································· Lower ring part 82 ········ Male screw 83 ······· Female screw 84 ····· Cap body 85 ····· Nozzle 88 ····· Rotation press-fit test note pile 89 ····· Squirt port 100 ····· Soil

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) E02D 7/24 E02D 7/24 (72) Inventor Hiromichi Iizawa 2-6-3 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Corporation (72) Inventor Hitoshi Oki 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Corporation (72) Koichi Sakai 2-6-3, Otemachi, Chiyoda-ku, Tokyo F-term in Nippon Steel Corporation (reference) 2D041 AA02 BA13 BA35 CA05 DB02 FA05 FA14 2D050 AA06 AA16 CA05 CB23 CB42

Claims (11)

[Claims] 1. A hollow pile main body, and an inner blade part abutting on the tip of the pile main body and protruding inside the pile main body and an outer blade part protruding outwardly are integrally formed. And a substantially spiral digging blade provided so that the pile body is an open-ended stake, a digging blade provided at the tip of the digging blade, and a fluid material to be ejected at the tip of the pile. A fluid substance ejection port provided at the bottom of the excavating blade so as to be thoroughly delivered; and the pile for supplying the fluid substance such as air, liquid, powder, and grout material ejected from the ejection port from the ground or the like. A rotary press-fit type pile comprising a supply pipe provided in the main body. 2. The rotary press-fit type pile according to claim 1, wherein the excavating blade is formed by being bent into a polygonal shape. 3. The expulsion port is located at the leading end or the trailing end of the excavating blade.
The rotary press-fit type pile according to claim 1, wherein the pile is provided on a front end side and a rear end side. 4. The nozzle according to claim 1, wherein the nozzle is provided with a plurality of nozzles radially so that the fluid can be uniformly mixed and stirred with the excavated ground. The rotary press-fit stake described. 5. A hollow pile main body, an excavating blade provided at a tip or a side portion of the pile main body, an ejection port provided below the pile main body and ejecting a fluid to the outside, A rotary press-fit type pile comprising a supply pipe provided in the pile body for supplying a fluid substance such as air, liquid, powder, grout material, etc. from a jet port from the ground or the like. 6. An opening is provided on the side of the outlet or the lower side of the supply pipe, and an auxiliary pipe for venting air or cleaning the outlet is joined to the opening. The rotary press-fit type pile according to claim 1 or 5, wherein 7. The rotary press-fit type pile according to claim 1, wherein the jet port is provided on the inner blade portion. 8. A hollow pile main body, an inner blade portion abutting on a tip of the pile main body and projecting inside the pile main body and an outer blade portion projecting outwardly are integrally formed, And, provided that the pile body is an open-ended pile, a substantially spiral spiral-shaped digging blade, a digging blade provided at the tip of the digging blade, and toward the digging blade and the tip of the pile, A fluid material ejection port provided at the bottom of the excavating blade and a fluid material such as air, liquid, powder, grout material, etc., ejected from the ejection port so that the ejected fluid material reaches the entire tip portion. A rotary press-fit type pile comprising a supply pipe provided in the pile main body for supplying from a pile or the like is appropriately press-buried while squirting a fluid from the jet port during rotary press-fitting into the ground. A method for burying a rotary press-fit type pile, comprising: 9. The ground according to claim 8, wherein the ground material is reinforced by rotating and press-fitting a fluid material made of a hardening material such as a grout material while ejecting it from an ejection port. Burying method of rotary press-fit type pile. 10. The method of claim 1, 2, 3, 4, 5, 6, or 7.
When the rotary press-fit type pile according to any of the above is buried by rotary press-fitting, during the rotary press-fitting burial, a fluid material is appropriately ejected from the jet port to excavate, and at the final burying stage, a curable grout material is used. A method of consolidating a rotary press-fit type pile, wherein a solidified body is formed in a ground below a drilling blade by ejecting a fluid material to strengthen a pile tip ground. 11. After the rotary press-fitting pile according to claim 5 or 6 is buried in a rotation and is fixed to a predetermined stratum, air or cleaning water is pumped from the auxiliary pipe to clean the inside of the supply pipe and the auxiliary pipe. And removing the supply pipe and the auxiliary pipe from the jet port and collecting them on the ground.