JP3265072B2 - Piling method and pile with pressurized water channel used for it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driving method suitable as a pile driving technique using a vibratory hammer and a high-pressure water jet together, and a pile provided with a pressurized water flow path used therefor.

[0002]

2. Description of the Related Art As is well known, a pile driven into the ground has a role of transmitting a load of a building structure into the ground, and a pile formed with a supporting pile or a ground that obtains a supporting force from a supporting rock. Piles with various support mechanisms have been adopted according to the scale of a building structure to be constructed, the geology of the ground to be cast, and the like, such as a friction pile that obtains a supporting force by frictional force.

[0003] By the way, when the supporting rock is deep,
When taking large frictional force from the ground, it is necessary to cast a long pile.As a conventional technique to penetrate such a long pile into the ground, a pile using a vibro hammer and a high-pressure water jet is used. Is known.

In this method, for example, as shown in FIG. 6, a pile 1 composed of two unit piles, an upper pile 2 and a lower pile 3 divided into unit lengths, is used. Are formed on the outer periphery of the side wall portion of the vehicle.
Are fixed along the longitudinal direction of the lower pile 3.

[0005] As shown in FIG. 7, a pressure-resistant hose 6 is connected to the upper end of the schedule pipe 4 of the lower pile 3.
Water introduced from a storage tank (not shown) is pressurized and supplied to the pressure-resistant hose 6 by the pressure pump P, and the pressurized water is jetted from the nozzles 5 of the schedule pipe 4 toward the ground near the tip of the lower pile 3. Then, the upper end of the lower pile 3 is driven into the ground G until the upper end of the lower pile 3 is exposed from the ground surface by a predetermined length.

Further, as shown in FIG. 8, the upper pile 2 is connected to the upper end of the lower pile 3 to form the pile 1 in which the upper pile 2 and the lower pile 3 are connected. Then, the upper end of the upper pile 2 is hit with a vibro hammer H, and the pile 1 is driven. At this time, the pressure hose 6 is guided and buried in the ground G together with the pile 1 to supply pressurized water to the tip of the lower pile 3 (see FIG. 9).

[0007]

By the way, in the conventional method for driving a pile 1, the expensive pressure-resistant hose 6 is buried in the ground G together with the pile 1 when penetrating the pile 1 as described above. , Construction costs were very high.

As means for solving such a problem, an upper pile 2
An inexpensive rod-shaped inexpensive schedule pipe is fixed to the outer periphery of the peripheral wall, and the lower pile 3 is penetrated into the ground G at a predetermined depth as described above. 6, the supply of pressurized water through the pressure-resistant hose 6 is temporarily stopped, and a schedule pipe fixed to the upper pile is connected in place of the pressure-resistant hose 6, and the detached pressure-resistant hose 6 is renewed. A method of supplying pressurized water again by connecting to the upper end of the connected schedule pipe is considered.However, if the supply of pressurized water is stopped during the placement of the pile, the nozzle is clogged, and Had trouble.

The present invention has been made in view of the above problems, and has as its object to provide a pile driving method capable of greatly reducing the construction cost and a pile provided with a pressurized water flow path used therefor. I have.

[0010]

According to the first aspect of the present invention, a plurality of unit piles having a pipe fixed thereto are prepared in advance, and the unit piles and the pipes are sequentially connected to each other to form a connection pile and a connection pipe. A method of driving a pile in which a connecting pile penetrates into the ground while forming a flow path and injecting pressurized water from a tip end of a pipe fixed to the lowest unit pile through the flow path, wherein another unit is provided at the upper end. The upper end of the pipe fixed to the lower unit pile to which the piles are connected has first and second branch paths, and a check valve is interposed in each of these branch paths, and When penetrating the unit pile, a flexible pressure-resistant hose is connected to the first branch path, and pressurized water is supplied to the flow path through the pressure-resistant hose to penetrate the lower unit pile, When the lower unit pile is penetrated into the ground with a certain depth, A new unit pile is connected to the upper end of the unit pile to form a connection pile, and when penetrating this connection pile, a pipe fixed to the new unit pile is connected to the second branch path. The method is characterized in that the flow path is formed, pressurized water is supplied through the flow path, and then the pressure-resistant hose is detached from the first branch path so that the connection pile further penetrates into the ground. .

According to a second aspect of the present invention, there is provided a pile having a pressurized water flow path used in the method of driving a pile according to the first aspect.
It is composed of a plurality of unit piles having a pipe forming a pressurized water flow path fixed thereto, and at least one of the pipes fixed to the plurality of unit piles has first and second pipes at its upper end.
And a check valve is interposed in each of the first and second branch paths.

[0012]

According to the first aspect of the present invention, a plurality of unit piles to which pipes are fixed in advance are sequentially connected to form a connection pile, and the pipes are connected to each other to form a flow formed by the connection pipe. A path is formed, and the pressurized water supplied through the flow path is ejected from the tip of the pipe fixed to the lowest unit pile, whereby the ground near the tip of the connecting pile is softened,
Penetration of the connecting pile into the ground is smoothly performed.

When a lower unit pile, to which another unit pile is connected at the upper end, penetrates into the ground, a pressure-resistant hose is connected to the first branch passage. Is supplied with pressurized water. At this time, the check valve of the first branch path is opened and the check valve of the second branch path is closed, so that pressurized water is supplied without leaking.

After the lower unit pile penetrates into the ground at a constant depth, a new unit pile is connected to the upper end of the lower unit pile to form a connection pile. When this connecting pile is penetrated into the ground, the pipe fixed to the new unit pile and the second branch of the pipe fixed to the lower pile are connected to form the flow path. Pressurized water is supplied through this flow path. Thereafter, when the pressure-resistant hose is detached from the first branch, the check valve of the first branch is closed, so that the pressurized water is supplied through the second branch and the connection pile is driven. Is made.

According to the second aspect of the present invention, a plurality of unit piles are connected to form a pile, and a pipe is fixed to each of the plurality of unit piles constituting the pile. When the pipes are connected, a pressurized water flow path is formed.

Here, at least one of the tubes fixed to the unit pile has first and second branch passages formed at the upper end thereof, and the first and second branch passages are formed. Since a check valve is interposed in each of the roads, when the unit pile into which the pipe is fixed penetrates into the ground, a pressure-resistant hose is inserted into one of the first and second branch paths. And pressurized water is supplied to the tube through the pressure-resistant hose.

After the new unit pile is connected to the upper end of the unit pile to form the connected pile, the other branch path of the pipe and the pipe fixed to the new unit pile are connected. And pressurized water flow is supplied through the added pipe so that the pressurized water is continuously supplied even when the pressure-resistant hose connected to the one of the branch passages is detached, and the pressure-resistant water is supplied continuously. The pile is driven without burying the hose in the ground.

[0018]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the drawings, portions common to those of FIGS. 6 to 9 shown as conventional examples are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 1A and 1B show an embodiment of a pile provided with a pressurized flowing water channel according to the present invention. The pile 1 shown in FIG. 1 is a cylindrical steel pipe pile formed by vertically connecting two unit piles having a predetermined length (hereinafter, referred to as “upper pile 2” and lower “pile 3”, respectively). . Schedule pipes (tubes) 7, 8 extending in the longitudinal direction of the upper pile 2 and the lower pile 3 are provided on the outer periphery of the side wall of the upper pile 2 and the lower pile 3, respectively.
Each of the schedule pipes 7 and 8 is connected to a flexible, pressure-resistant short connection hose 9 between the schedule pipes 7 and 8. A pressurized water flow path W is formed by the pipes 7 and 8 and the connecting hose 9.

The schedule pipe 7 fixed to the upper pile 2 is formed in the shape of an external rod, and as described above, the schedule pipe 7 is located at the upper and lower ends of the upper pile 2 so as to be left over by a predetermined length. It is set short. On the other hand, in the schedule pipe 8 fixed to the lower pile 3, branch paths (first and second branch paths) 10 and 11 that branch into two at the upper end thereof are formed.
Branches 12, 13, and 14 are formed at the lower end thereof. The branches 12, 13, and 14 are formed into a single tube at a middle portion in the longitudinal direction. Similarly, it is set shorter than the lower pile 3.

Couplers C are attached to the upper and lower open ends of the schedule pipe 7 and the open ends of the branch passages 10 and 11 of the schedule pipe 8, respectively.
Jet nozzles 12a, 13a, and 14a are attached to the lower ends of the branches 12, 13, and 14 of the schedule pipe 5. Further, check valves 15, 15 for guiding water only downward are attached to the intermediate portions in the longitudinal direction of the branch passages 10, 11.

Next, a method of driving the pile 1 having the pressurized water flow path W will be described with reference to FIGS. In these figures, reference symbol G indicates the ground, and H indicates a vibro hammer.

First, the schedule pipes 7 and 8 are arranged on the outer periphery of the wall of the upper pile 2 and the lower pile 3 in advance in the longitudinal direction.
And a water supply tank (not shown), a pressure pump P, and a water supply hose 16 for supplying pressurized water from the pressure pump P to the schedule pipes 7 and 8.
Have prepared.

The water supply hose 16 is connected to the pressure pump P
Pressure hose 17 connected to the hose, a collecting branch pipe 18 connected to the end of the pressure hose 17, and the collecting branch pipe 1
8 and two pressure hoses 19, 20 for connecting the schedule pipes 7, 8 to each other. The water storage tank and the pressure pump P are connected by a suction hose (not shown), and the pressure pump P , A pressure-resistant hose 17 is connected to the valve 18a,
By opening and closing 8b, pressure hoses 19,
20 water supply is controlled.

Next, as shown in FIG. 2, an assembly branch 18 is connected to the branch 10 of the schedule pipe 8 fixed to the lower pile 3.
Is connected to the pressure-resistant hose 19. Then, the valve 18a is opened, the water introduced from the storage tank (not shown) is pressurized by the pressure pump P and supplied to the schedule pipe 8, and the nozzle 12a, While jetting pressurized water from 13a and 14a, the upper end of the lower pile 3 is hit with a vibratory hammer H to penetrate the lower pile 3 into the ground G such that the upper end is exposed by a predetermined length from the ground surface.

Then, as shown in FIG. 3, the upper pile 2 is carried over the lower pile 3 by a lifting machine (not shown), and the upper pile 2 is connected to the upper end of the lower pile 3 by welding. While forming the pile 1 as a connection pile, the branch path 11 and the lower end of the schedule pipe 7 of the upper pile 2 are connected by a connection hose 9 to add a pressurized water flow path W, and the upper end of the schedule pipe 7 The pressure hose 20 is connected. And the valve 18
b is opened and pressurized water is supplied through the pressure-resistant hose 20.

Then, while closing the valve 18a,
The water pressure in the pressure-resistant hose 19 is lowered by opening a leak valve (not shown), and the pressure-resistant hose 19 connected to the branch passage 10 of the schedule pipe 8 is detached. Then, the upper end of the newly connected upper pile 2 is hit with a vibro hammer H to make the pile 1 penetrate into the ground G to a predetermined depth.

Further, after the pile 1 is penetrated to a predetermined depth, the valve 18b is closed, and the water pressure in the pressure-resistant hose 20 is lowered by opening a leak valve (not shown). Then, the pile 1 is completed.

In the pile 1 provided with the pressurized water channel W having the above structure, the upper pile 2 and the lower pile 3 are connected to each other to form the pile 1, and the upper pile constituting the pile 1 is formed. 2. Schedule pipes 7, 8 are fixed to each of the lower piles 3,
The pressurized water flow path W is formed by connecting these schedule pipes 7 and 8 with the short connecting hose 9.

Here, at the upper end of the schedule tube 8,
Since the branch passages 10 and 11 are formed, and the check valves 15 and 15 are interposed in each of the branch passages 10 and 11, when the lower pile 3 penetrates into the ground G to a predetermined depth, By connecting a pressure-resistant hose 19 to the branch passage 10, pressurized water is supplied through the pressure-resistant hose 19. At this time, since the check valve 15 of the branch passage 10 is opened and the check valve 15 of the branch passage 11 is closed, pressurized water is supplied without leaking.

After the upper stake 2 is connected to the upper end of the lower stake 3 to form the stake 1 composed of the connecting stake, the branch path 11 of the schedule pipe 8 and the lower end of the schedule pipe 7 of the upper stake 2 Are connected by a connecting hose 9 to form a pressurized water passage W, and a pressurized water is supplied by connecting a pressure-resistant hose 20 to the upper end of the schedule pipe 7. Thereafter, when the pressure-resistant hose 19 is detached from the branch passage 10, the check valve 15 of the branch passage 10 is closed, so that pressurized water is supplied through the branch passage 11 and the pressure-resistant hose is buried in the ground. And the pile 1 is driven without any change.

As described above, according to the pile 1 having the pressurized water channel W of the above embodiment, when the lower pile 3 penetrates into the ground to a predetermined depth, the schedule pipe 8 fixed to the lower pile 3 is used.
After connecting a pressure-resistant hose 19 to the branch passage 10 to supply pressurized water and penetrate, and connecting the upper pile 2 to the upper end of the lower pile 3,
The branch path 11 of the lower pile 3 and the lower end of the schedule pipe 7 of the upper pile 3 are connected by a short connecting hose 9 to add a pressurized water flow path W upward, and a pressure-resistant hose 20 is connected to the added flow path W. While connecting and supplying pressurized water, the pressure-resistant hose 19 connected to the branch passage 10 can be detached and the pile 1 can be driven, so that the pressure-resistant hoses 19 and 20 are not buried in the ground G, and The pile 1 can be driven while continuously supplying pressurized water. Therefore, the ground G
The pressure-resistant hose buried inside can be kept extremely short as compared with the conventional one, and the construction cost can be greatly reduced.

In the above embodiment, the pile 1 is formed by connecting two unit piles, the upper pile 2 and the lower pile 3, but the number of unit piles is limited to two. It is needless to say that the number of unit piles may be three or more.

In this case, the lowermost unit stake and the uppermost unit stake have the same structure as the upper stake 2 and the lower stake 3 in the above embodiment, and are connected between them. As shown in FIG. 5, the unit stakes are provided at the upper end thereof with bifurcated branches 21, 21 similar to the schedule pipe 8.
In addition, a schedule pipe 23 having check valves 22 and 22 is fixed to each of the branch paths 21 and 21, and the unit pile is connected to the upper pile 2 and the lower pile 3.
And pressurized water can be supplied by connecting the pressurized water flow path W with the schedule pipe 23.

Also, two pressurized water passages W are provided on the outer periphery of the side wall of the pile 1, but the present invention is not limited to this, and three or four pressurized water passages W are provided in accordance with the scale of the pile to be cast. It can be increased as appropriate. Further, although the pile 1 is formed of a cylindrical steel pipe pile, it goes without saying that a cylindrical steel pipe pile having a polygonal cross section such as a rectangle or an octagon may be used.

[0036]

According to the method for driving a pile according to the present invention and the pile having a pressurized water flow path used for the method, the following effects can be obtained. According to the method for driving a pile according to claim 1, the upper end of the pipe fixed to the lower unit pile to which the other unit pile is connected to the upper end has the first and second branch paths. In addition, a check valve is interposed in each of these branch paths, and when penetrating the lower unit pile, a flexible pressure-resistant hose is connected to the first branch path, and the pressure-resistant hose is connected to the first branch path. And pressurized water is supplied to the flow path through the lower unit pile to penetrate the lower unit pile, and when the lower unit pile penetrates into the ground at a certain depth, a new unit pile is placed at the upper end of the lower unit pile. When the connecting pile is connected to form a connecting pile and the connecting pile is penetrated, a pipe fixed to the new unit pile is connected to the second branch path to form the flow path. Pressurized water through the first
The pressure-resistant hose is detached from the branch road of the above, so that the connection pile is further penetrated into the ground, so that the pile is penetrated while continuously discharging pressurized water from the tip of the pipe fixed to the lowest unit pile. In addition, since the pressure-resistant hose does not need to be buried in the ground, the construction cost can be significantly reduced as compared with the related art.

According to the pile provided with the pressurized water flow path according to the second aspect, at least one of the upper ends of the pipes forming the pressurized water flow path fixed to each of the plurality of unit piles is the first. The first and second branch passages are each provided with a check valve, so that the unit pile fixed to the pipe body is placed in the ground. When penetrating, a pressure-resistant hose is connected to one of the first and second branch paths to penetrate while supplying pressurized water, and a new unit pile is connected to the upper end of this unit pile and connected. After the pile is formed, when the connection pile is penetrated, the other branch path is connected to the pipe of the new unit pile, and the pressurized water flow path is extended upward. Supply, and take the pressure-resistant hose connected to one branch Also, it is possible to continuously supply without interrupted pressurized water. Therefore, since the pressure hose buried in the ground can be suppressed to be extremely short as compared with the related art, the construction cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a pile provided with a pressurized flowing water channel according to the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 2 is a diagram showing a pile driving process of the embodiment, and is a schematic diagram showing a state where the lowest unit pile is penetrated into the ground.

FIG. 3 is a view showing a pile driving process of the embodiment, and is a schematic view showing a state where a new unit pile is connected to the upper end of the lowest unit pile.

FIG. 4 is a diagram showing a pile driving process of the embodiment, and is a schematic diagram showing a state where the connecting pile is penetrated into the ground.

5A and 5B are diagrams showing another example of the unit pile constituting the pile according to the present invention, wherein FIG. 5A is a front view and FIG. 5B is a side view.

FIG. 6 is a view showing a conventional pile, (a) is a front view,
(B) is a side view.

FIG. 7 is a view showing a conventional pile driving process, and is a schematic view showing a state where the lowest unit pile is penetrated into the ground.

FIG. 8 is a view showing a conventional pile driving process, and is a schematic view showing a state where a new unit pile is connected to the upper end of the lowest unit pile.

FIG. 9 is a view showing a conventional pile driving process, and is a schematic view showing a state where a connecting pile is penetrated into the ground.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pile 2, 3 Unit pile 7, 8 Tube 10 First branch 11 Second branch 19, 20 Pressure hose H

Continuation of the front page (56) References JP-A-3-293048 (JP, A) JP-A-53-26405 (JP, A) JP-A-60-18143 (JP, U) (58) Fields studied (Int .Cl. ⁷ , DB name) E02D 7/24 E02D 7/18 E02D 5/24 E02D 5/32

Claims (2)

(57) [Claims] 1. A plurality of unit piles having a pipe fixed thereto are prepared in advance, and the unit pile and the pipe are sequentially connected to form a flow path composed of a connection pile and a connection pipe. A method of driving a pile in which the connecting pile penetrates into the ground while squirting pressurized water from the end of the pipe fixed to the unit pile, and fixed to the lower unit pile to which the other unit pile is connected at the upper end The upper end of the pipe body has first and second branch paths, and a check valve is interposed in each of these branch paths, and when the lower unit pile penetrates, A flexible pressure-resistant hose is connected to the branch path, and pressurized water is supplied to the flow path through the pressure-resistant hose to penetrate the lower unit pile, and the lower unit pile is inserted into the ground at a constant depth. When penetrated, a new unit pile is connected to the upper end of the lower unit pile To form a connecting pile, and when penetrating the connecting pile, connecting the pipe fixed to the new unit pile to the second branch path to form the flow path, and through the flow path A method of driving a pile, characterized in that pressurized water is supplied, and then the pressure-resistant hose is detached from the first branch passage so that the connecting pile further penetrates into the ground. 2. A pile provided with a pressurized water flow path used in the method for driving a pile according to claim 1, comprising a plurality of unit piles having a pipe forming a pressurized water flow path fixed thereto. At least one of the pipes fixed to the plurality of unit piles has first and second branch paths formed at the upper end thereof, and each of the first and second branch paths has A pile provided with a pressurized water flow path, wherein a check valve is interposed.