JP5783894B2 - Tip-expanded pile - Google Patents

Description

The present invention relates to a tip diameter-expanded pile that is a pile that builds up a foundation with a fluidized solidifying material, and particularly relates to a tip diameter-expanded pile excellent in tip support force.

Conventionally, as a construction method for increasing the tip bearing capacity of steel piles, (1) excavating the ground to the support layer with a drilling rod having a drilling head at the tip, then (2) flowing cement milk or the like into the drilled drilling hole A method of injecting and fixing a steel pile whose diameter is larger than that of the pile body into a drilling hole is known. (For example, refer to Patent Document 1).
However, in this construction method, when a steel pile whose diameter is expanded at the tip of the pile is press-fitted and fixed in the excavation hole, the excavation diameter of the excavation hole must be increased by an amount corresponding to the expansion of the tip of the pile. For this reason, there is a problem that the economy is reduced due to an increase in size of a heavy machine accompanying an increase in the diameter of the excavation head, and a problem that the amount of soil is large and the environment is adversely affected.

As another construction method, (1) A steel pile is driven to a predetermined depth in the ground by using the vibration of the vibrator hammer and the water jet (water jet) force from the nozzle attached to the tip of the pile. Next, (2) the water injection from the nozzle is switched to cement milk injection, and the root support capacity of the steel pile is increased by building a diameter-hardening root at the pile tip, and (3) further required Accordingly, a construction method is also known in which the pile peripheral surface portion is also filled with cement milk to increase the peripheral frictional force of the steel pile (see, for example, Patent Documents 2 to 4).
However, today, there is a growing demand for larger diameters of foundations to be built and increased end support capacity than ever before, without reducing economic efficiency and workability, and earth removal. Development of a construction method that can satisfy the above requirements while suppressing the amount or piles used for this method has become an urgent issue.

JP-A-8-85939 JP 56167070 JP 2004-270157 A JP 2005-325513 A

The problem to be solved by the present invention is to provide a tip diameter-expanded pile capable of obtaining a high workability and a tip support force while reducing the amount of discharged soil without lowering the economic efficiency.

The gist of the present invention is as follows.
(1) steel piles;
An outer shell steel pipe having a larger diameter and a shorter axis than the steel pile, which is arranged so as to cover the outer peripheral surface of the tip portion in the direction of placing the steel pile,
A plurality of rib plates for joining the steel pile and the outer shell steel pipe, arranged so as to radially partition a space formed between the outer peripheral surface of the steel pile and the inner peripheral surface of the outer shell steel pipe; ,
Arranged at a constant interval in the circumferential direction of the outer circumferential surface or inner circumferential surface of the steel pile placing direction tip,
A plurality of nozzles for placing direction for injecting water or fluidized solidified material in the direction of placing the steel pile ;
Further, a plurality of water or fluidized solidified material disposed in the circumferential direction of the outer circumferential surface or inner circumferential surface of the outer circumferential surface or inner circumferential surface of the outer shell steel pipe is injected in the casting direction of the steel pile. A tip diameter-expanded pile, which is a pile for laying up a foundation with the fluidized solidifying material, comprising a nozzle for placing direction .

(2) steel piles,
An outer shell steel pipe having a larger diameter and a shorter axis than the steel pile, which is arranged so as to cover the outer peripheral surface of the tip portion in the direction of placing the steel pile,
A plurality of rib plates for joining the steel pile and the outer shell steel pipe, arranged so as to radially partition a space formed between the outer peripheral surface of the steel pile and the inner peripheral surface of the outer shell steel pipe; ,
A plurality of casting directions for injecting water or a fluidized solidified material in the casting direction of the steel piles arranged at regular intervals in the circumferential direction of the outer peripheral surface or the inner peripheral surface of the tip direction of the steel pile. For nozzles,
Furthermore, the water or the fluidized solidified material disposed at a constant interval in the circumferential direction of the outer peripheral surface or inner peripheral surface of the outer circumferential surface or inner circumferential surface of the outer steel pipe in the casting direction is horizontally outward from the casting direction of the steel pile. A tip diameter-expanded pile, which is a pile that builds a root with the fluidized solidified material , comprising a plurality of nozzles for obliquely outward directions that inject in an obliquely outward direction that is an angle between .

(3) One or two or more through-holes are formed in the rib plate, The tip-expanded pile according to (1) or (2) .

(4) The outer peripheral surface of the tip direction of the steel pile,
The inner peripheral surface of the tip direction of the outer shell steel pipe,
The tip diameter-expanded pile according to any one of (1) to ( 3 ), wherein a slip stopper is formed on any one or more of the rib plates.

(A) All the tip diameter-expanded piles according to the present invention include a shell steel pipe having a larger diameter and a shorter axis than the steel pile so as to cover the outer peripheral surface of the tip portion in the casting direction of the steel pile. Therefore, the outer diameter of the steel pile in the casting direction is expanded by the outer shell steel pipe, and the adhesion of the fluidized solidified material to the steel pile or the outer shell steel pipe is increased. Since the firm portion is restrained, a high tip support force can be obtained.
Moreover, all the tip enlarged diameter piles which concern on this invention are a steel pile and an outer shell by the some rib plate which partitions off the space formed between the outer peripheral surface of a steel pile and the inner peripheral surface of an outer shell steel pipe radially. Join the steel pipe. Therefore, it has a structure that can withstand the increase in support force associated with the above-mentioned expansion of the root diameter. Further, since the plurality of rib plates are arranged so as to partition the space in the radial direction, the upper and lower ends of the outer shell steel pipe are opened. For this purpose, it is possible to drive the tip-expanded pile directly on the raw ground. This eliminates the need for prior auger excavation and is economical. Furthermore, unlike the invention described in Patent Document 2 that closes the tip of the pile, most of the original ground stays at the same position at the time of construction, the amount of soil removal is small, and it is excellent in economic efficiency and environmental friendliness.
Furthermore, all the tip diameter-expanded piles according to the present invention are provided with a plurality of placement direction nozzles at regular intervals in the circumferential direction of the outer peripheral surface or inner peripheral surface of the steel pile placement direction tip. For this reason, water or a fluidized solidified material can be intensively injected from the nozzle for placement direction in the direction of placing the steel pile, and the workability during placement can be improved. In addition, when solidifying, the steel pile or the outer shell steel pipe can be efficiently filled with a fluidized solidifying material, thereby exhibiting excellent workability and tip support.
Therefore, according to all the tip diameter-expanded piles according to the present invention, high workability and tip support force can be obtained without lowering the economic efficiency and further suppressing the amount of soil discharged.

(B) According to the tip enlarged-diameter pile according to the present invention in which the nozzle for casting direction is further arranged at a constant interval in the circumferential direction of the outer peripheral surface or inner peripheral surface of the distal end portion in the casting direction of the outer shell steel pipe, Water or fluidized solidified material can be injected in the steel pile casting direction from both the casting direction tip and the outer steel pipe casting direction tip, further improving the workability during casting. be able to. In addition, when solidifying, it is possible to efficiently fill the inside of the steel pile or shell steel pipe, especially the inside of the shell steel pipe, with the fluidized solidifying material, thereby exhibiting excellent workability and tip support force. To do.

(C) Alternatively, a plurality of casting direction nozzles are arranged at regular intervals in the circumferential direction of the outer circumferential surface or inner circumferential surface of the steel pile casting direction front end portion, and According to the tip enlarged-diameter pile according to the present invention in which a plurality of nozzles for oblique outward directions are arranged at regular intervals in the circumferential direction of the outer peripheral surface or inner peripheral surface, water or fluidity is greater than the nozzle for driving direction at the time of driving. Solidified material can be injected intensively in the direction of steel pile placement, and when expanding the diameter, the nozzle for the diagonally outward direction gives priority to the diagonally outward direction, which is the angle between the steel pile placement direction and the horizontal outward direction. It is possible to improve the workability at the time of placing and expanding the diameter. In particular, during the construction of the root solidification, the fluidized solidification material can be efficiently filled into the steel pile or the outer shell steel pipe by the injection of the fluidized solidification material from the nozzle for placing direction, and the diagonally outward direction. The fluidized solidified material can be efficiently filled into the outer and outer regions of the outer shell steel pipe by jetting the fluidized solidified material from the directional nozzle, thereby providing excellent workability and tip support. To do.

(D) According to the tip diameter-expanded pile according to the present invention in which one or two or more through holes are formed in the rib plate, the stirring efficiency with the earth and sand in the support layer when the fluidized solidified material is injected is increased. Homogenization of the fluidized solidified material and the original ground filled in the space formed between the outer peripheral surface of the outer shell and the inner peripheral surface of the outer shell steel pipe can be promoted. As a result, the tip supporting force of the tip diameter-expanded pile can be increased.

(E) According to the present invention, a slip stopper is formed on any one or more of the outer peripheral surface of the steel pile placing direction front end portion, the inner peripheral surface of the outer shell steel pipe placing direction front end portion, and the rib plate. According to the tip diameter-expanded pile, the adhesion force of the fluidized solidified material to the steel pile, the outer shell steel pipe, and the rib plate can be increased. As a result, the tip supporting force of the tip diameter-expanded pile can be increased.

It is a mimetic diagram showing an example of a tip diameter expansion pile concerning the present invention. It is a mimetic diagram showing an example of a tip diameter expansion pile concerning the present invention. It is a schematic diagram which shows an example of the tip diameter expansion pile which concerns on this invention which formed the through-hole in the rib plate. It is a schematic diagram which shows an example of the tip diameter expansion pile which concerns on this invention which has further arrange | positioned the nozzle for casting direction in the casting direction front-end | tip part of an outer shell steel pipe. It is a schematic diagram which shows an example of the tip diameter expansion pile which concerns on this invention which has arrange | positioned the nozzle for diagonally outward directions to the casting direction front-end | tip part of an outer shell steel pipe. It is a schematic diagram which shows an example of the tip enlarged diameter pile which concerns on this invention which arranged the nozzle for diagonally outward directions in multiple steps | paragraphs in the casting direction tip part of the outer shell steel pipe. It is a mimetic diagram showing an example of a tip diameter-expanded pile concerning the present invention which formed slip prevention.

Hereinafter, an embodiment for carrying out the present invention will be described with reference to FIGS.
Drawing 1 is a mimetic diagram showing an example of a tip diameter-expanded pile concerning the present invention. In addition, in the said figure, illustration is abbreviate | omitted about the nozzle 5 for placement directions, and the piping hose (for nozzles for placement directions) 9. FIG. FIG. 2 is a schematic view showing an example of a tip diameter-expanded pile according to the present invention.

As shown in FIG. 2, the tip diameter-expanded pile 1 according to the present invention includes a steel pile 2, a shell steel pipe 3, a rib plate 4, and a nozzle 5 for placing direction.
The outer shell steel pipe 3 has a larger diameter than the steel pile 2. More specifically, the inner diameter of the outer shell steel pipe 3 is larger than the outer diameter of the steel pile 2. Since the outer end of the steel pile 2 is expanded in diameter by providing the outer steel pipe 3 having a diameter larger than that of the steel pile 2 at the front end, the steel pile 2 or the outer steel pipe 3 While the adhesive force of the fluidized solidifying material is increased, the root solidified portion is restrained from the outside by the outer shell steel pipe 3, so that a high tip support force can be obtained.
The steel pile 2 may be a steel pipe, H-shaped steel, a steel pipe sheet pile, or a steel sheet pile.
Since the outer shell steel pipe 3 only needs to cover the outer peripheral surface of the tip portion in the casting direction of the steel pile on which the root solidification is built, a shorter axis than the steel pile 2, that is, a steel pipe shorter in the axial direction is used. In other words, a steel pipe having a length corresponding to the height of the root hardening to be built is used.

The steel pile 2 and the outer shell steel pipe 3 are joined by a plurality of rib plates 4. By joining the steel pile 2 and the outer shell steel pipe 3 with the plurality of rib plates 4, a structure capable of withstanding the increased supporting force accompanying the above-described expansion of the root solidification is obtained.
The rib plate 4 is disposed in a space formed between the outer peripheral surface of the steel pile 2 and the inner peripheral surface of the outer shell steel pipe 3. More specifically, the space is arranged so as to partition in the radial direction. In other words, the steel piles 2 are arranged radially about the axis. Since the plurality of rib plates 4 are arranged so as to divide the space in the radial direction, the upper and lower ends of the outer shell steel pipe 3 are opened, so that the tip enlarged pile 1 can be directly placed on the original ground. This eliminates the need for prior auger excavation and provides excellent economic efficiency. Furthermore, since the upper and lower ends of the outer shell steel pipe 3 are opened, unlike the invention described in Patent Document 2 that closes the pile tip, most of the original ground stays at the same position during construction, and the amount of soil is reduced. Moreover, it becomes a structure which can endure the high bearing force accompanying the said diameter expansion of the root hardening.

The number of rib plates 4 is not particularly limited, and is determined according to the ground conditions, the size of the foundation to be built, the difference between the inner diameter of the outer shell steel pipe 3 and the outer diameter of the steel pile 2, and the like. However, it is desirable to use at least three or more sheets from the viewpoint of a structure capable of withstanding a high supporting force accompanying the expansion of the root diameter.
Similarly, it is desirable to arrange the adjacent rib plates 4 so as to be equidistant from the viewpoint of a structure capable of withstanding a high supporting force accompanying the expansion of the root diameter and the viewpoint of workability.

The short side length of the rib plate 4 is preferably set to (inner diameter of the outer shell steel pipe 3−outer diameter of the steel pile 2) / 2.
The long side length of the rib plate 4 is preferably at least longer than the length of the outer shell steel pipe 3 from the viewpoint of a structure capable of withstanding a high supporting force accompanying the expansion of the root diameter. Is preferably the same as the length of the outer shell steel pipe 3.
Regarding the plate thickness of the rib plate 4, the ground conditions, the size of the root consolidation to be built, the inner diameter of the outer steel pipe 3, and the structure that can withstand the increased bearing capacity accompanying the diameter expansion of the root consolidation, It determines according to the outer diameter difference of the steel pile 2, etc.

The material of the rib plate 4 is also not particularly limited, but it is desirable to use a steel plate from the viewpoint of a structure that can withstand the increased support force accompanying the expansion of the root diameter.
The joining means between the steel pile 2 and the rib plate 4 or the joining means between the rib plate 4 and the outer shell steel pipe 3 is not particularly limited, and for example, joining by bolts and nuts or welding can be used.
In addition, it is desirable to join so that the casting direction front-end | tip part of the steel pile 2 and the casting direction front-end | tip part of the outer shell steel pipe 3 may align.

FIG. 3 is a schematic view showing an example of a tip enlarged-diameter pile according to the present invention in which through holes are formed in the rib plate.
As shown in the figure, it is desirable to form one or two or more through holes 7 in the rib plate 4 within a range satisfying the design proof stress. By forming the through holes 7 in the rib plate 4, the convection between the earth and sand and the fluidized solidifying material in the support layer when the fluidized solidifying material is injected is promoted, and the stirring efficiency is increased. Thereby, the homogenization of the fluid solidification material and raw ground with which the space formed between the outer peripheral surface of the steel pile 2 and the inner peripheral surface of the outer shell steel pipe 3 can be accelerated | stimulated, and tip diameter expansion The tip supporting force of the pile 1 can be increased.

It does not specifically limit as the number of the through-holes 7, As mentioned above, it forms in the range which satisfies the design yield strength of the rib plate 4. FIG.
The portion of the rib plate 4 that forms the through-hole 7 is preferably disposed uniformly throughout the rib plate 4 from the viewpoint of promoting the homogenization of the fluidized solidified material and the original ground.
The shape of the through hole 7 is not particularly limited, and may be any shape such as a circle, a rectangle, a triangle, and a trapezoid. When two or more through holes 7 are formed, their shapes and sizes may be different from each other. By varying the shape and size, homogenization of the fluidized solidified material and the original ground may be promoted.

  The nozzle 5 for placing direction is a nozzle that injects water or a fluidized solidified material in the placing direction of the steel pile 2, and is constant in the circumferential direction of the outer peripheral surface or inner peripheral surface of the steel pile 2 in the placing direction. Arrange at intervals of. By arrange | positioning in this way, water or a fluid solidification material can be injected intensively in the direction of casting of the steel pile 2, and the workability at the time of placing can be improved. Moreover, at the time of construction of root hardening, the inside of the steel pile 2 thru | or the outer shell steel pipe 3 can be efficiently filled with a fluid solidification material, and this can exhibit the outstanding workability | operativity and tip support force.

The number of placing direction nozzles 5 is not particularly limited, and is determined according to the ground conditions, the size of the foundation to be built, the difference between the inner diameter of the outer steel pipe 3 and the outer diameter of the steel pile 2, and the like. However, from the viewpoint of workability, it is desirable to use at least three or more.
From the viewpoint of workability at the time of placement, it is desirable to arrange the placement direction nozzles 5 adjacent in the circumferential direction at equal intervals.
The nozzle 5 for placing direction may be detachable from the steel pile 2 or not.

The number of injection holes formed in the nozzle 5 for the placing direction is not particularly limited, and is 1 or 2 or more. However, when it is set as two or more injection holes, each injection hole makes the placing direction of the steel pile 2 an injection direction.
The part for forming the injection hole is not particularly limited, and may be an end part of the nozzle 5 for the placing direction or a side part.

A piping hose (for the casting direction nozzle) 9 is connected to the nozzle 5 for the casting direction, and water or a fluidized solidifying material is supplied to the nozzle 5 for the casting direction from here.
In the present invention, a plurality of driving direction nozzles 5 are used, but a piping hose (for driving direction nozzles) 9 may be shared between the plurality of driving direction nozzles 5 or each. A separate piping hose (for the nozzle for direction of placement) 9 may be connected to the nozzle 5 for the direction of placement.
It is desirable to connect a pump with a flow rate adjusting function for supplying water or a fluidized solidifying material to the piping hose (for the nozzle for placing direction) 9. By using a pump with a flow rate adjusting function, it is possible to control any one or more of injection pressure, injection amount, injection time, and injection timing of water or fluidized solidified material to be injected substantially.
The pump with a flow rate adjusting function is not particularly limited, and for example, a precision gear pump, a trochoid pump, an oscillating pump, a plunger pump, or the like can be used.
For the flow rate adjustment of the pump with the flow rate adjustment function, a control means comprising a computer (electronic computer) may be used, or it may be set manually.

FIG. 4 is a schematic view showing an example of a tip diameter-expanded pile according to the present invention in which a casting direction nozzle is further arranged at a leading end portion of the outer shell steel pipe.
As shown in the figure, the casting direction nozzles 5 may be further arranged at a constant interval in the circumferential direction of the outer circumferential surface or inner circumferential surface of the outer circumferential surface of the casting steel pipe 3 in the casting direction. That is, the placement direction nozzles 5 are arranged at regular intervals in the circumferential direction of the outer peripheral surface or inner peripheral surface of the steel pile 2 in the placement direction, and the outer periphery of the placement direction front end of the outer shell steel pipe 3. You may arrange | position with the fixed space | interval in the circumferential direction of a surface or an internal peripheral surface.

Thereby, water or a fluidized solidified material can be injected in the direction of the steel pile 2 from both the direction of the steel pile 2 and the direction of the outer direction of the outer steel pipe 3. The workability at the time can be further improved.
In addition, when solidifying, the inside of the steel pile 2 or the outer shell steel pipe 3, especially the inner shell steel pipe 3, can be efficiently filled with a fluidized solidifying material, thereby providing excellent workability and tip support. I can demonstrate my power.
In particular, when the outer diameter of the outer shell steel pipe 3 reaches more than twice the outer diameter of the steel pile 2, when the placement direction nozzle 5 is arranged only at the distal end portion of the steel pile 2, Where it is difficult to efficiently fill the inside of the outer shell steel pipe 3 with the fluidized solidifying material, the outer shell is provided by disposing the nozzle 5 for the casting direction at the leading end of the outer shell steel pipe 3 as well. The fluid solidifying material can be efficiently filled into the steel pipe 3.

FIG. 5 is a schematic view showing an example of a tip diameter-expanded pile according to the present invention in which a nozzle for an obliquely outward direction is arranged at the tip portion in the casting direction of the outer shell steel pipe.
As shown in the figure, the diagonally outward nozzles 6 may be arranged at regular intervals in the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer shell steel tube 3 or the inner circumferential surface. That is, the placing direction nozzles 5 are arranged at regular intervals in the circumferential direction of the outer peripheral surface or inner peripheral surface of the steel pile 2 in the casting direction front end, and the oblique outward direction nozzles 6 are arranged in the outer shell steel pipe. You may arrange | position with the fixed space | interval in the circumferential direction of the outer peripheral surface or inner peripheral surface of the 3 placement direction front-end | tip part.

Thereby, at the time of casting, water or a fluidized solidified material can be preferentially injected from the nozzle 5 for the direction of casting in the direction of casting of the steel pile, and at the time of diameter expansion, the direction of casting of the steel pile from the nozzle 6 for the obliquely outward direction Can be intensively injected in the diagonally outward direction, which is an angle between the horizontal outward direction, and the workability during placement and diameter expansion can be improved.
In particular, at the time of building the root solidification, the fluidized solidifying material can be efficiently filled into the steel pile 2 or the outer shell steel pipe 3 by the injection of the fluidized solidifying material from the nozzle 5 for placing direction, By injecting the fluidized solidified material from the nozzle 6 for the obliquely outward direction, the fluidized solidified material can be efficiently filled into the outer and outer regions of the outer shell steel pipe 3, and excellent workability and tip support are provided. I can demonstrate my power.

The number of the diagonally outward nozzles 6 is not particularly limited, and is determined according to the ground conditions, the size of the foundation to be built, the difference between the inner diameter of the outer steel pipe 3 and the outer diameter of the steel pile 2, and the like. . However, from the viewpoint of workability, it is desirable to use at least three or more.
From the viewpoint of workability at the time of placing, it is desirable that the oblique outward nozzles 6 adjacent in the circumferential direction are arranged at equal intervals.
The diagonally outward nozzle 6 may or may not be detachable from the outer steel pipe 3.

The number of injection holes formed in the oblique outward nozzle 6 is not particularly limited, and is 1 or 2 or more. However, when it is set as two or more injection holes, each injection hole makes the injection direction the diagonally outward direction which is an angle between the direction of the steel pile placement and the horizontal outward direction.
The part for forming the injection hole is not particularly limited, and may be an end part of the nozzle 6 for the obliquely outward direction, or may be a side part.

A pipe hose (for an obliquely outward nozzle) 10 is connected to the obliquely outward nozzle 6, and water or a fluidized solid material is supplied to the obliquely outward nozzle 6 from here.
In the present invention, a plurality of oblique outward direction nozzles 6 are used, but a piping hose (for oblique outward direction nozzles) 10 may be shared between the plurality of oblique outward direction nozzles 6, Alternatively, individual piping hoses (for obliquely outward nozzles) 10 may be connected to each obliquely outward nozzle 6.

It is desirable to connect a pump with a flow rate adjusting function for supplying water or a fluidized solidifying material to the piping hose (for the nozzle for the obliquely outward direction) 10. By using a pump with a flow rate adjusting function, it is possible to control any one or more of injection pressure, injection amount, injection time, and injection timing of water or fluidized solidified material to be injected substantially.
The pump with a flow rate adjusting function is not particularly limited, and for example, a precision gear pump, a trochoid pump, an oscillating pump, a plunger pump, or the like can be used.
For the flow rate adjustment of the pump with the flow rate adjustment function, a control means comprising a computer (electronic computer) may be used, or it may be set manually.

FIG. 6 is a schematic view showing an example of a tip diameter-expanded pile according to the present invention in which a plurality of nozzles for an obliquely outward direction are arranged at a tip portion in the casting direction of the outer shell steel pipe.
As shown in the drawing, the nozzle 6 for the oblique outward direction is placed at a constant interval in the circumferential direction of the outer peripheral surface or inner peripheral surface of the outer circumferential surface or inner circumferential surface of the outer steel pipe 3 and in the casting direction (axial direction). A plurality of stages may be arranged.
Thus, if the nozzles 6 for the diagonally outward direction are arranged in a plurality of stages in the casting direction (axial direction) of the outer shell steel pipe, it is possible to shorten the rooting and building time.
In this case, the piping hose (for oblique outward nozzles) 10 may be shared, or a separate piping hose (for oblique outward nozzles) for each oblique outward nozzle 6. 10 may be connected.

FIG. 7 is a schematic view showing an example of a tip diameter-expanded pile according to the present invention in which a slip stopper is formed.
As shown in the figure, any one of (a) the outer peripheral surface of the steel pile 2 in the casting direction tip, (b) the inner peripheral surface of the outer shell steel pipe 3 in the casting direction tip, and (c) the rib plate 4 Alternatively, a stopper 8 such as a steel plate with protrusions or a reinforcing bar may be formed on one or two or more. By forming the detents 8, it is possible to increase the adhesion force of the fluidized solidified material to the steel pile, the outer shell steel pipe, and the rib plate, and to increase the tip support force of the tip diameter-expanded pile 1.

(Water jet method, Vibro method combined with water jet)
The tip diameter-expanded pile 1 according to the present invention can be applied to a construction method in which water is injected from the placement direction nozzle 5 to a depth at which the root consolidation is built, and then the root consolidation is built. In this case, it is desirable to use in combination with a vibro hammer (not shown) mounted on the steel pile 2. If vibration of the vibrator hammer and water jet (water jet) from the placement direction nozzle 5 are used in combination, noise and vibration due to placement can be reduced, and the amount of soil discharged can be suppressed. Further, if necessary, the peripheral surface portion of the outer shell steel pipe 3 can be filled with a fluidized solidifying material such as cement milk, so that the peripheral frictional force of the tip diameter-expanded pile 1 can be increased.

Further, instead of placing the tip-expanded pile 1 by water injection from the placing direction nozzle 5, the tip-expanding according to the present invention is performed while excavating to a depth at which a solidification is built with a drilling rod having a drilling head at the tip. The diameter pile 1 may be embedded.

DESCRIPTION OF SYMBOLS 1 Tip diameter enlarged pile 2 Steel pile 3 Outer shell steel pipe 4 Rib plate 5 Nozzle for casting direction 6 Nozzle for diagonally outward direction 7 Through-hole 8 Detent 9 Piping hose (for nozzle for casting direction)
10 Piping hose (for nozzle for oblique outward direction)

Claims (4)

Steel piles,
An outer shell steel pipe having a larger diameter and a shorter axis than the steel pile, which is arranged so as to cover the outer peripheral surface of the tip portion in the direction of placing the steel pile,
A plurality of rib plates for joining the steel pile and the outer shell steel pipe, arranged so as to radially partition a space formed between the outer peripheral surface of the steel pile and the inner peripheral surface of the outer shell steel pipe; ,
A plurality of casting directions for injecting water or a fluidized solidified material in the casting direction of the steel piles arranged at regular intervals in the circumferential direction of the outer peripheral surface or the inner peripheral surface of the tip direction of the steel pile. For nozzles ,
Further, a plurality of water or fluidized solidified material disposed in the circumferential direction of the outer circumferential surface or inner circumferential surface of the outer circumferential surface or inner circumferential surface of the outer shell steel pipe is injected in the casting direction of the steel pile. A tip diameter-expanded pile, which is a pile for laying up a foundation with the fluidized solidifying material, comprising a nozzle for placing direction . Steel piles,
An outer shell steel pipe having a larger diameter and a shorter axis than the steel pile, which is arranged so as to cover the outer peripheral surface of the tip portion in the direction of placing the steel pile,
A plurality of rib plates for joining the steel pile and the outer shell steel pipe, arranged so as to radially partition a space formed between the outer peripheral surface of the steel pile and the inner peripheral surface of the outer shell steel pipe; ,
A plurality of casting directions for injecting water or a fluidized solidified material in the casting direction of the steel piles arranged at regular intervals in the circumferential direction of the outer peripheral surface or the inner peripheral surface of the tip direction of the steel pile. For nozzles,
Furthermore, the water or the fluidized solidified material disposed at a constant interval in the circumferential direction of the outer peripheral surface or inner peripheral surface of the outer circumferential surface or inner circumferential surface of the outer steel pipe in the casting direction is horizontally outward from the casting direction of the steel pile. A tip diameter-expanded pile, which is a pile that builds a root with the fluidized solidified material , comprising a plurality of nozzles for obliquely outward directions that inject in an obliquely outward direction that is an angle between . The tip expanded diameter pile according to claim 1 or 2 , wherein one or two or more through holes are formed in said rib plate. The outer peripheral surface of the steel pile in the casting direction tip, the inner circumferential surface of the shell steel pipe in the casting direction tip, and any one or more of the rib plates are formed with a stopper. The tip diameter-expanded pile according to any one of claims 1 to 3 .

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