JP2001140255A - Pile embedding method, high pressure water conduit and pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pile embedding method lowering the peripheral resistance to a pile, facilitating the force fit of the pile, the pile used therefor and a high pressure water conduit by moving earth and sand through jet water. SOLUTION: High pressure water is led to a jet nozzle 10 provided to the lower end of a pile 3. Force-fit of the pile is made while jetting the high pressure water to the lower ground of the pile from the jet nozzle 10. The force-fit of the pile 3 is made while forming such a water supply system as water jetted from the jet nozzle 10 flows from the neighborhood of the lower end of the pile 3 to the surface of the ground. The conduit 11 is formed in the shape of a triangular conduit 11a, and the water supply system is formed in and around it by rotating the conduit 11a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile embedding method for injecting a pile while jetting jet water (high-pressure water) to the ground,
The present invention relates to a pile and a high-pressure water pipe used for the pile.

[0002]

2. Description of the Related Art When a pile (including a sheet pile) is press-fitted and driven, for example, a method is known in which a reaction force is taken from an existing pile by a pile press-in device and the pile to be driven is press-fitted by the reaction force. Have been. However, depending on the condition of the ground into which the pile is pressed, a large pressure (hydraulic pressure) is required for press-fitting the pile, but there is a limit to the hydraulic pressure used in the pile press-fitting device. Therefore, for example, Japanese Patent Application Laid-Open No. 9-125390 discloses a method of press-fitting a pile while jetting jet water (high-pressure water) onto the ground.

In the conventional pile press-in method, a pile to be press-fitted is set in a pile press-in device, a jet nozzle is installed at the lower end of the pile, and the high-pressure water pump and the jet nozzle are connected by a round pipe or a hose. Then, by jetting water from a jet nozzle, the earth and sand near the lower end was made to be in a flowable state, and the peripheral surface resistance of the pile was reduced, thereby facilitating the press-fitting of the pile.

[0004]

However, in the above-mentioned pile press-fitting method, while the pile is being press-fitted, the soil near the lower end of the pile is compacted, and the soil is closed. Even when high-pressure water was used, it was sometimes difficult to press-fit a pile. Also, the high-pressure water injected from the lower end may permeate into the earth and sand below the lower end of the pile, and in this case, the effect of reducing the peripheral resistance of the pile may be lost.

The present invention has been made in view of the above circumstances, and forms a water supply for returning jet water to the surface of the ground to discharge earth and sand below the pile, reduce peripheral resistance of the pile, It is an object of the present invention to provide a pile embedding method for facilitating the embedding of a pile, a pile used for the method, and a high pressure water conduit.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that high-pressure water is jetted from the jetting means provided at the lower end of the pile to the ground below the pile. In the pile embedding method of embedding the pile in the ground, the pile is buried while forming a water supply such that water injected from the injection means flows from near the lower end of the pile to the surface of the ground. It is characterized by going.

As described above, according to the first aspect of the present invention, since the pile is buried while forming a water supply from the lower end of the buried pile to the surface of the pile, the water injected from the injection means is discharged from the water supply pipe. Water flows from the lower end of the pile to the surface of the ground. Due to this water flow, the soil near the lower end of the pile is carried to the ground surface. Thereby, since the earth and sand are not compacted, the pile can be easily buried. Further, since water is formed in the vicinity of the pile over the entire portion of the pile buried in the ground, this water can reduce the peripheral resistance of the pile. In addition, since water can flow upward along the formed water supply, water is prevented from immediately permeating into the soil below the lower end of the pile, and the tip of the pile due to water penetration is suppressed. A decrease in the pore water pressure in the vicinity can be suppressed. The water supply is a passage for high-pressure water injected from the lower end of the pile, and is a portion where water in the earth and sand is easily flown.

According to a second aspect of the present invention, in the pile burying method according to the first aspect, a water supply forming section is provided in advance on the pile to guide water injected from the injection means upward.
The water supply is formed by the water supply forming section.

As described above, according to the second aspect of the present invention, when the pile is buried, high-pressure water is formed near the pile from the lower end of the pile to the surface of the ground by the water supply forming part of the pile. Therefore, the same effect as the configuration according to claim 1 can be obtained. In addition, the water supply forming part is to form a part where water flows easily in the soil along the pile,
Plates and cylinders that are provided on the pile and extend vertically
It is a ridge or the like, a conduit attached to the pile to guide high-pressure water to the lower end of the pile, or a ridge provided on the outer surface of the conduit.

According to a third aspect of the present invention, when the pile is buried in the ground while injecting high-pressure water by the injection means provided at the lower end of the pile, the pile extends from the upper part of the pile to the lower end of the pile. A high-pressure water conduit for guiding high-pressure water, wherein the high-pressure water conduit is rotatably attached to the pile and has a polygonal cross section.

As described above, according to the third aspect of the present invention, the polygonal conduit is rotatably attached to the pile, so that when the pile is buried, the conduit can be rotated or the right and left can be rotated. When it is vibrated so as to rotate alternately, a void is formed in the earth and sand around the conduit, and this portion becomes a water supply through which water easily flows. That is, when the pile is buried, high-pressure water is formed in the vicinity of the pile from the lower end of the pile to the surface of the ground, so that the same effect as the configuration of claim 1 can be obtained.

Further, according to the present invention, when the pile is buried in the ground while injecting high-pressure water by the injection means provided at the lower end of the pile, from the upper part of the pile to the lower end of the pile. A high-pressure water conduit that extends and guides high-pressure water, wherein a plurality of ridges are provided on a surface along a longitudinal direction.

As described above, according to the fourth aspect of the present invention, when the pile is buried, since the negative pressure is applied to the soil between the ridges, the blast is injected from the injection means. Due to the pressure of the water, sediment between the ridges is carried to the surface of the ground, and a gap is formed between the ridges. This gap becomes the water supply. That is, when the pile is buried, high-pressure water is formed in the vicinity of the pile from the lower end of the pile to the surface of the ground, so that the same effect as the configuration of claim 1 can be obtained.

According to a fifth aspect of the present invention, there is provided a pile embedded in the ground while injecting high-pressure water by an injection means provided at a lower end portion, and injects high-pressure water so as to extend vertically. A conduit for feeding the means is provided, and a water supply forming part extending vertically near the periphery of the conduit and forming a water supply for guiding high-pressure water injected when buried in the ground is provided. It is characterized by having.

As described above, according to the fifth aspect of the present invention, since the water supply forming portion is provided on the pile so as to extend vertically, high-pressure water is supplied near the pile when the pile is buried. The water supply is formed from the lower end of the pile to the surface of the ground, and the same effect as the configuration according to claim 1 can be obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pile embedding method according to the present invention will be described below. As an embodiment of the present invention, a pile press-fitting method of burying a pile in the ground by press-fitting a pile is used. Before explaining the pile press-fitting method according to the embodiment of the present invention, a pile press-fitting device used in the pile press-fitting method will be described with reference to the drawing shown in FIG. The drawings described below are only schematically shown to the extent that the invention can be understood, and thus the invention is not limited to the illustrated examples. FIG.
1 shows a pile press-in device used for press-fitting a pile as an example to which the present invention is applied.

This pile press-in device 1 is a well-known device.
The pile 3 is press-fitted (buried) into the ground by taking a reaction force from the existing pile (sheet pile) 2 and driven, and can be moved on the driven pile 2. Then, along with this movement, a new pile 3 is pressed into the ground. This pile press-in device 1
Are mounted, for example, on a clamp 5 that hangs from the saddle 4 to clamp the existing pile 2, a mast 6 that stands on the saddle 4 via a slide base, and a vertically movable front side of the mast 6. The lift 7 includes a main cylinder 8 that moves the lift 7 up and down, and a chuck 9 attached to the lift 7. The chuck 9 holds the new pile 3,
Due to the lowering, a new pile 3 is pressed into the ground.

At the time of the pile press-fitting by the pile press-fitting device 1,
Jet water (high-pressure water) is sprayed on the ground. For this reason, a jet nozzle 10 (injection means) for injecting jet water is attached to the new pile 3 by a nozzle socket (not shown). In this case, a metal band or the like is used for the nozzle socket, and the metal band is welded to the pile 3 while the jet nozzle 10 is rotatably sandwiched between the metal band and the pile 3 so as to form the jet nozzle. 10 is mounted. The jet nozzle 10 is connected to a high-pressure water pump 15 via a high-pressure water conduit 11, a hose 12, a drum 13, and a hose 14. The high-pressure water pump 15 is connected to the water suction pump 1 via a hose 16.
7, and a water suction pump 17 draws water from a water source 18. The water pumped by the high-pressure water pump 15 is pressurized by the high-pressure water pump 15 so that jet water is supplied from the high-pressure water pump 15 to the jet nozzle 10.

Next, the details of the conduit 11 shown in FIG. 1 will be described. FIG. 2 is a sectional view showing a conduit 11a used in the first example of the pile press-fitting method according to the present invention, and the conduit 11a shown in FIG. 2 is an example of the conduit 11 shown in FIG. The conduit 11a shown in FIG. 2 is a pipe such as a steel pipe having a triangular cross section. The conduit 11 a has substantially the same length as the pile 3, is rotatably supported by the chuck 7, and extends vertically substantially in parallel with the pile 3. And
A jet nozzle 10 is connected to a lower end of the conduit 11a, and a hose 12 is connected to the other end. Then, jet water flows into the pipe 11a.

Next, the press-fitting of the pile 3 using the conduit 11a will be described. First, start the pile press-in device 1,
The pile 2 driven by the clamp 5 is clamped. Then
The conduit 11a is connected to the jet nozzle 10 and the hose 12, and the jet nozzle 10 is attached to the lower end of the pile 3 to be cast. Next, the mast 6 is moved to the upper end portion by the main cylinder 8, the pipe 11 a and the pile 3 provided with the jet nozzle 10 are held by the chuck 9, and the pipe 11 a is rotatably supported by the chuck 9. As described above, after the pile 3 is set in the pile press-in device 1, a pile press-in process of press-fitting the pile 3 into the ground is performed.

In the pile press-fitting step, the pile 3 is pressed into the ground by taking a reaction force from the pile 2 cast on the ground and lowering the chuck 9 by the main cylinder 8. At this time, the jet water is caused to flow to the jet nozzle 10 by the high-pressure water pump 15, the jet water is jetted downward from the lower end of the pile 3 from the jet nozzle 10, and
a is rotated. Note that the conduit 11a does not need to rotate in one direction, and may be in a state in which left rotation and right rotation are alternately performed (a state in which the conduit 11a rotates so as to vibrate left and right). The rotation of the conduit 11a may be based on, for example, the flow of high-pressure water, or may use hydraulic pressure or other power. Next, the pile 3 with the chuck 9 is used.
Is released, the chuck 9 is moved to the upper end of the mast 6, and the pile 3 is again held, and the chuck 9 is moved downward while rotating the conduit 11a. And the conduit 11a
Of the chuck 9 in the state where the pile 3 is held while rotating the chuck 9, and the chuck 9 in the state where the holding of the pile 3 is released.
The pile 3 is driven into the ground by repeating the upward movement of the pile 3 alternately.

The operation and effect of the pile press-fitting method as described above will be described. The stake 3 is press-fitted while jet water is being injected from the lower end of the stake 3, and the soil around the lower end of the stake 3 is in a state where it is easy to flow. Labor saving. Further, since the triangular conduit 11a is rotated, the earth and sand in the circle 11a1 (shown in FIG. 2) drawn at the apex of the conduit 11a flows and is in a cheap state, and is ejected from the jet nozzle 10. Water pushes up the earth and sand in the circle 11a1 to the ground,
A gap is formed between the circle 11a1 and the surface of the conduit 11a. As a result, the jet water jetted from the jet nozzle 10 flows to the surface of the ground as water through the gap, and the sediment near the lower end of the pile 3 flows to the surface of the ground according to the flow of water. Is not compacted. Therefore, the earth and sand near the lower end of the pile 3 flows more easily, and the press-fitting of the pile 3 is further reduced. In addition, the said conduit | pipe 11a is the water supply formation part for forming a water supply.

Further, since the water jetted from the jet nozzle 10 flows to the surface of the ground through the vicinity of the pile 3, the peripheral surface resistance of the pile 3 is reduced in the vicinity thereof, and the water is directed toward the lower end of the pile 3. By preventing the pile 3 from penetrating, the effect that the earth and sand at the lower end of the pile 3 easily flow is not diminished, and the labor for press-fitting the pile 3 can be reduced. The above conduit 11
Although a has a triangular cross section, it may have a polygonal shape such as a square shape or a pentagonal shape. In the case of the triangular shape, the gap between the circle drawn at the apex and the conduit becomes the largest, so that the above-described operation and effect are most efficiently achieved. Also, the conduit 11a
Is made of steel, but other metals, ceramics, etc. may be used as long as they are not crushed by earth and sand when the pile 3 is pressed. In addition, the pile 3 is not limited to a sheet pile, and the present invention can be applied to various piles (including a sheet pile).

Next, a second example of the pile press-fitting method according to the present invention will be described with reference to FIG. FIG. 3 is a drawing showing a conduit used in the second example of the pile press-fitting method according to the present invention,
The conduit 11b shown in FIG. 3 is an example of the conduit 11 shown in FIG. In the conduit 11b shown in FIG. 3, four substantially semi-cylindrical ridges are provided on the surface of a cylindrical pipe such as a steel pipe along the longitudinal direction of the pipe so as to divide the surface of the pipe into four. ing. When the pile is pressed in using the conduit 11b, the pile 3, the conduit 11b, and the hose 12 are set in the pile press-in device 1 as in the case of using the conduit 11a.
The pile 3 is press-fitted while rotating 1b. This conduit 11
According to the pile press-fitting method using b, since a gap is formed between the circle drawn by the apex of the ridge and the surface of the conduit 11b, the same effect as that of the pile press-fitting method using the conduit 11a as described above is obtained. Description is omitted.

When the pile is press-fitted using the conduit 11b, the pile 3 may be press-fitted without rotating the conduit 11b. This is because a negative pressure is applied to the earth and sand existing on the surface side of the conduit 11b from the line connecting the vertices of the adjacent ridges, so that the water jetted from the jet nozzle 10 makes it easy to be washed off to the surface of the ground. It is. As a result, a gap is formed between the inside of the line connecting the vertices of the adjacent ridges and the conduit 11b.
Water injected from 0 flows out to the surface of the ground surface, and has the same effect as the above case.

The conduit 11 shown in FIGS.
c and 11d show modified examples of the conduit 11b shown in FIG. 3, and the conduit 11c may have a prismatic shape on the surface of a cylindrical pipe such as a steel pipe. 4) are provided on the surface of the pipe along the longitudinal direction of the pipe so that the ridges divide the surface of the pipe into four. Also, the conduit 11d is arranged along the longitudinal direction of the pipe such that a ridge having a prismatic shape (also not limited to a prismatic shape) divides the surface of the pipe into eight parts on the surface of a cylindrical pipe such as a steel pipe. There are eight of them. The pile press-fitting method using the conduits 11c and 11d has the same operation and effect as the pile press-fitting method using the conduit 11b, and a detailed description thereof will be omitted. In addition,
The number of protrusions is not limited to four or eight, and a plurality may be provided. When the pile is press-fitted while rotating the conduit, only one ridge may be provided on the surface of the conduit. The conduits 11b, 11c, 11d and the ridges constitute a water supply forming part for forming a water supply. Note that a conduit having a spiral ridge on the surface of a cylindrical pipe, that is, a conduit having a screw surface may be used. With this screw-shaped conduit, the screw serves as a water supply forming unit that forms water supply.

Next, a third example of the pile press-fitting method according to the present invention will be described with reference to FIG. FIG. 6 is a drawing showing a pile used in the third example of the pile press-fitting method according to the present invention, and the pile shown in FIG. 6 is an example of the pile 3 shown in FIG. The pile shown in FIG. 6 is a steel sheet pile 3a. A steel pipe 3a3 (tubular body) is joined to the inside of the web portion 3a2 of the steel sheet pile main body 3a1 in the longitudinal direction. The inner diameter of the steel pipe 3a3 is
Is larger than the outside diameter of The pile press-in device 1 is also used for press-fitting the steel sheet pile 3a. When press-fitting the steel sheet pile 3a, first, the pile press-fitting device 1 is activated, and the pile 2 driven by the clamp 5 is clamped. Next, the steel sheet pile 3a
The pipe 11 is guided to the steel pipe 3a3 of the above, the jet nozzle 10 is attached to the lower end of the pipe 11, and the hose 12 is connected to the upper end of the pipe 11. Next, the mast 6 is moved to the upper end by the main cylinder 8 and the steel sheet pile 3 is moved.
a is held by the chuck 9. After the steel sheet pile 3a is set in the pile press-in device 1 as described above, a pile press-in step of press-fitting the steel sheet pile 3a into the ground is performed. In the pile press-in step, the steel sheet pile 3a is pressed into the ground by lowering the chuck 9 by the main cylinder 8, and jet water is jetted downward from the lower end of the steel sheet pile 3a from the jet nozzle 10. According to the pile press-fitting method using the steel sheet pile 3a, the water jetted from the jet nozzle 10 flows out to the surface of the ground along the gap between the steel pipe 3a3 and the conduit 11 due to the water jetted from the jet nozzle 10. The same effects as in the first example can be obtained. In addition, the said steel pipe 3a3 is a water supply formation part which forms a water supply.

The steel sheet pile 3b shown in FIG.
This shows a modification of the steel sheet pile 3a shown in FIG. 1, in which a steel pipe 3b3 (cylindrical body) is joined to the inside of the web portion 3b2 of the steel sheet pile main body 3b1 in the longitudinal direction, and the steel pipe 3b
Auxiliary material 3b extending in an arc shape and extending up and down so that cylindrical portions 3b5 and 3b5 are formed between the inside of web portion 3b and web portion 3b2.
4, 3b4 are joined inside the web portion 3b2.
Then, similarly to the press-fitting of the steel sheet pile 3a, the conduit 11 is guided to the steel pipe 3b3, and the steel sheet pile 3b is press-fitted by using the pile press-fitting device 1. According to the pile press-fitting method using the steel sheet pile 3b, the water jetted from the jet nozzle 10 along the cylindrical portions 3b5, 3b5 flows out to the ground surface. In addition, the auxiliary materials 3b4 and 3b4 have the same function as the ridges of the above-mentioned conduit, so that water flows to the surface of the inside of the arc-shaped auxiliary materials 3b4 and 3b4. Therefore, the same effects as those of the first example are provided. The outer diameter of the conduit 11 and the steel pipe 3
If the inside diameter of b3 is substantially the same, the conduit 11 and the steel pipe 3b3
Since water does not flow between them, a relatively soft hose made of resin can be used as the conduit 11. The arc-shaped auxiliary members 3b4, 3b4 and the steel pipe 3b3 constitute a water supply forming section for forming a water supply.

Incidentally, in the steel sheet pile 3a, the steel pipe 3a
It may be configured to have a hole that penetrates through the surface of the steel pipe 3 and the inside of the steel pipe 3a3. Water and earth and sand flowing through the tap water can be discharged from this hole. Similarly, the steel sheet pile 3b may be configured to have a hole.

[0030]

According to the pile embedding method of the present invention, a gap is formed between the conduit and the earth and sand, and the gap serves as a water supply, and the water injected from the injection means flows along the water supply to the surface of the ground. Therefore, the flow effect of the earth and sand near the lower end of the pile is increased, whereby the peripheral resistance of the pile is further reduced, and labor for press-fitting the pile can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a pile press-in device used for pile press-in as an example to which the present invention is applied.

FIG. 2 is a sectional view showing a conduit used for press-fitting a pile as a first example to which the present invention is applied.

FIG. 3 is a sectional view showing a conduit used for press-fitting a pile as a second example to which the present invention is applied.

FIG. 4 is a cross-sectional view showing another example of the conduit used in the second embodiment.

FIG. 5 is a cross-sectional view showing a conduit of another example different from the conduit used in the second example.

FIG. 6 is a sectional view showing a pile used for press-fitting a pile as a third example to which the present invention is applied.

FIG. 7 is a cross-sectional view showing a pile of another example different from the pile used in the third example.

[Explanation of symbols]

 Reference Signs List 3 pile 3a steel sheet pile (pile) 3a3 steel pipe (cylinder) 3b steel sheet pile (pile) 3b3 steel pipe (cylinder) 3b5 cylinder 10 jet nozzle (injection means) 11 conduit 11a conduit 11b conduit 11c conduit 11d conduit

Claims (5)

[Claims] 1. A pile embedding method for embedding the pile in the ground while injecting high-pressure water into the ground below the pile from an injection means provided at a lower end portion of the pile, A pile burying method, wherein the pile is buried while forming a water supply such that the drained water flows from the vicinity of the lower end of the pile to the surface of the ground. 2. The pile burying method according to claim 1, wherein the pile is provided with a water supply forming portion for guiding the water jetted from the jetting means upward, and the water supply forming portion forms the water supply. Pile burying method characterized by the following. 3. A high pressure water extending from an upper portion of the pile to a lower end of the pile to guide the high pressure water when the pile is buried in the ground while injecting high pressure water by an injection means provided at a lower end of the pile. A high-pressure water conduit, which is rotatably attached to the pile and has a polygonal cross-sectional shape. 4. When a pile is buried in the ground while injecting high-pressure water by an injection means provided at a lower end of the pile, the high-pressure water is guided from the upper part of the pile to the lower end of the pile. A high-pressure water conduit, wherein a plurality of ridges are provided on a surface thereof along a longitudinal direction. 5. A stake buried in the ground while injecting high-pressure water by an injection means provided at a lower end portion, wherein a conduit for sending high-pressure water to the injection means so as to extend vertically is provided. A stake, wherein a water supply forming part is provided near the periphery of the conduit, the water supply forming part extending up and down and forming a water supply for guiding the high-pressure water injected when buried in the ground upward. .