JPH1046572A - Pile, construction method of wall-shaped structure and pile press-in pulling-out machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a PC wall body construction method to make a wall- shaped structure by continuously driving precast concrete(PC) square column- shaped piles. SOLUTION: Piles 1 are composed of a pile main body 2 being a steel pipe and a square column shaped concrete part 3 arranged in an upper part of this pile main body 2. A wall-shaped structure is constructed by continuously pressing these piles 1 in the ground so that the concrete part 3 is exposed. The piles 1 can be more easily pressed in than when a square column-shaped PC pile is pressed in since the pile main body 2 to be pressed in the ground is formed of a steel pipe. Since comparatively expensive and high strength concrete is used only in an exposed part of the piles 1, cost of the piles 1 can be reduced. When the wall-shaped structure is constructed, since an interval is left between mutual pile main bodies 2, the flow of an undergroud water vein is not cut off. These piles l can be easily pressed in by a pile press-in pulling-out machine having a raising-lowering body 16 capable of gripping-holding the pile main body 2 and a raising-lowering body 18 capable of gripping holding the concrete part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile used for constructing an earth retaining wall, a method of constructing a wall-like structure, and a pile press-in / draw-out machine.

[0002]

2. Description of the Related Art There is generally known a method of continuously driving a pile (sheet pile) for the purpose of earth retaining or the like. Conventionally, for example,
In revetment work, etc., piles are continuously driven along the shore to perform earth retaining and waterproofing, and then excavation and construction of revetment walls, etc.
Then, after construction of the revetment, removal and backfilling of sheet piles were performed.

[0003] In such a construction method, it is necessary to carry out the temporary work for retaining the soil with a sheet pile as described above before constructing the revetment wall, and to remove and refill the sheet pile after constructing the revetment wall. The work had to be done and the efficiency was poor. In order to eliminate the need for temporary work, the present applicant has to drive a square pillar made of precast concrete (PC) continuously along the shore, for example.
A PC wall construction method for constructing a PC wall composed of PC piles was developed.

According to the above-mentioned PC wall construction method, the PC wall itself composed of PC piles serves as a retaining wall and a revetment wall, so that basically no temporary construction is required.
Seawalls can be constructed simply by driving piles continuously. Therefore, it is possible to significantly reduce the construction period and cost.

In addition, the present applicant has already developed a pile press-in / pull-out machine which, when press-fitting a pile, grasps a previously driven pile and presses or pulls another pile while taking a reaction force from the pile. In the above-mentioned PC wall construction method, P
The C pile is press-fitted using the above-mentioned pile press-in / draw-out machine. In addition, the pile press-in / draw-out machine can press-fit a conventional steel sheet pile or a steel pipe sheet pile, and can pull out and pull out the driven sheet pile when removing the sheet pile.

[0006]

By the way, steel pipe sheet piles and steel sheet piles are basically plate-shaped (in the case of steel pipes, the plate is rounded into a cylinder), whereas the PC pile is not used. Even if it has a prismatic shape and has a hollow portion communicating with the upper and lower ends inside, the area of the lower end surface is large, and a large tip resistance is generated at the time of press-fitting.

Therefore, in order to press-fit a PC pile used in the above-described PC wall construction method, a high pressure (hydraulic pressure) is required, and depending on the properties of the ground, it is difficult to press-fit only by hydraulic pressure. In some cases, it may be necessary to use a jet method using jet water, which may require more labor and cost than press-fitting steel pipe sheet piles or steel sheet piles.

[0008] Further, the PC pile is required to have high strength in order to withstand press-fitting and to function as a retaining wall or the like, and it is preferable to use high-strength prestressed concrete. There will be a cost. In addition, even considering the cost increase as described above,
Since wall-like structures such as revetment walls can be constructed by continuously injecting PC piles, for constructing temporary revetment walls after constructing temporary retaining walls with steel sheet piles, Although significant cost reduction can be achieved, further cost reduction has been required.

Further, the above-mentioned pile press-in / pull-out machine has a lifting / lowering body which has a chuck for gripping a pile to be press-fitted and moves up and down, and lowers the lifting / lowering body while holding the pile with the chuck. Although piles are press-fitted, there are various types of piles such as the above-mentioned PC pile, steel sheet pile, and steel pipe sheet pile, and it is difficult to handle different types of piles with one chuck. there were.

[0010] The present invention has been made in view of the above circumstances, and a pile capable of reducing the cost of constructing a permanent wall-like structure by continuously press-fitting the pile. It is an object of the present invention to provide a method for constructing a wall-like structure and a pile press-in / draw-out machine.

[0011]

A pile according to claim 1 of the present invention is a pile driven into the ground with at least a part of the upper part being exposed, wherein a pile body made of a steel material and a pile body are formed. The provision of a concrete portion provided on the upper portion is a means for solving the above problem. According to the above configuration,
By continuously driving a large number of the piles such that the concrete portions abut against each other, a concrete wall-like structure can be constructed in the same manner as the conventional PC pile described above.

When the pile is press-fitted, the pile body made of a steel material is driven into the ground, so that the tip resistance is smaller than that of the conventional PC pile, which is smaller than that of the conventional PC pile. It can be easily press-fitted with a small pressure. Further, since only the upper part of the pile is made of concrete, the cost can be reduced as compared with the case where the entire pile is made of concrete, which is more expensive than steel.

When a concrete wall-like structure is constructed with the above-mentioned piles, a large number of pile bodies driven into the ground act as foundation piles, and the wall-like structure can be made strong. When a concrete portion is provided on the upper portion of the pile main body, basically, the concrete portion is formed around the upper portion of the pile main body, and the concrete portion becomes thicker than the pile main body. Therefore, when piles are continuously pressed in so that the concrete portions come into contact with each other, there is an interval between the pile bodies in the ground that have been continuously pressed.

Therefore, even if the piles are continuously pressed into a place where the groundwater level is relatively high, the flow of the groundwater vein is interrupted due to the interval between the pile bodies in the ground. Nothing. Also, in an area where the groundwater level is high and liquefaction is likely to occur, such as a loose sandy ground, the possibility of liquefaction can be reduced by not disturbing the movement of the groundwater.

The pile body is, for example, a pile made of the same steel material as a well-known steel sheet pile or steel pipe sheet pile. The concrete part is precast concrete formed in a factory or the like in advance. Further, the concrete portion is preferably high-strength concrete,
Prestressed concrete is preferably pre-stressed with PC (prestressed concrete) steel or the like.

It is preferable that the concrete portion has a plate shape or a prism shape so as to have a wall shape when a large number of the piles are continuously press-fitted. In addition, the concrete part is not necessarily limited to a plate shape or a prism shape,
The shape of the constructed wall-like structure may be uneven, but when used as a revetment wall, a retaining wall, or the like, it is necessary that the shape be such that there is no gap between adjacent concrete portions.

According to a second aspect of the present invention, there is provided a method for constructing a wall-like structure, wherein the pile according to the first aspect is continuously driven to construct the wall-like structure. Means for solving the above-mentioned problem is that the lower side of the concrete portion is buried in the ground and the piles are continuously driven so that the concrete portions of the adjacent piles abut each other when continuously driven. And
According to the configuration, the same operation and effect as the above-described operation and effect of the pile according to claim 1 can be obtained.

According to a third aspect of the present invention, a pile press-in and pull-out machine is provided.
A pile press-in / pull-out machine that grabs an already driven pile and presses or pulls another pile while taking a reaction force from the pile, and a main body that grips the already driven pile and takes a reaction force. A swivel portion rotatably provided on the main body, and a plurality of swivel portions which are provided in parallel on the side surface of the swivel portion so as to be able to move up and down while gripping the pile, and press-fit or pull out the pile. A plurality of elevating bodies, each of the plurality of elevating bodies is formed so as to be able to grasp different types of piles, and at the time of press-fitting / pulling out the piles, the plurality of elevating bodies are rotated by rotating the turning part. The fact that the apparatus can be switched and used is a means for solving the above problem.

According to the above construction, the pile has a plurality of lifting members which can be vertically moved while holding the pile to press-fit or pull out the pile, and each lifting member press-fits a different type of pile. It is possible to switch between a plurality of elevating bodies by rotating the above-mentioned swiveling part, so that basically different types of piles can be used with one pile press-in and pull-out machine. Can be handled.

The pile according to the first aspect of the present invention has a concrete portion on an upper portion of a steel pile body, and one pile is formed by joining a steel pile and a concrete pile. Basically, it is difficult to press-in a pile with a conventional pile press-in and pull-out machine having one elevating body that can press-in only one type of pile. At the time of the press-fitting of the pile body at the bottom of the pile, press-fit the pile using the lifting body corresponding to the pile body made of steel among the plurality of lifting bodies, press-fit the pile to some extent, and When it becomes necessary to grab the concrete part with the elevating body, it becomes possible to rotate the revolving part to grasp and press-fit the pile using the elevating body corresponding to the concrete part of the plurality of elevating bodies.

That is, by using the pile press-in and pull-out machine according to the third aspect, the pile according to the first aspect can be easily press-fitted. The pile according to claim 1 is for constructing a permanent wall structure, not a temporary structure,
Basically, it is not necessary to pull out the pile, but the pile press-in and pull-out machine according to claim 3 can pull out the pile.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pile, a pile press-in / pull-out machine and a method for constructing a wall-like structure according to an embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a pile 1 and a pile press-in / draw-out machine 10 of this example. As shown in FIGS. 1 and 2, the pile 1 of this example includes a pile main body 2 made of a steel pipe and a concrete portion 3 provided on an outer periphery of an upper portion of the pile main body 2. In FIG. 1, the pile 1 is shown in a state where the center of the pile 1 is seen through so that the inside of a pile main body 2 made of a steel pipe can be illustrated, and the actual appearance of the pile 1 is shown in FIGS. 12 is shown.

The pile main body 2 is basically a steel pipe pile,
It has a cylindrical shape whose upper and lower ends are open. The concrete part 3 is provided so as to cover the periphery of the steel pipe at the upper part of the pile main body 2 and has a prismatic shape. An opening communicating with the inside of the pile body 2 is formed in the upper end surface of the concrete portion 2.

The periphery of the concrete portion 3 is finished, for example, to improve the appearance. The concrete part 3 is made of high-strength prestressed concrete, and is precast concrete formed in advance at a factory or the like. Further, the concrete portion 3 may be formed by centrifugal molding.

Next, the pile press-in / pull-out machine 10 will be described. As shown in FIG. 1, a pile press-in / pull-out machine 10 of this example includes a saddle 12 having two clamps 11 for holding two press-fitted piles 1 adjacent to the ground.
A slide portion (shown in FIG. 3) 13 provided on the saddle 12 so as to be slidable back and forth;
A swivel part (mast) 14 is provided on the side 3 so as to be swivelable at least 180 degrees left and right, and a pile main body 2 of a pile 1 to be driven, which is provided on a side surface of the swivel part 14 so as to be slidable up and down. A first lifting / lowering body 16 having a first chuck 15 that can be gripped, and a side of the revolving portion 14 opposite to the side on which the first lifting / lowering body 16 is provided are slidably provided vertically. And a second lifting / lowering body 18 having a second chuck 17 capable of gripping the concrete portion 3 of the pile 1 to be driven.

By operating a hydraulic cylinder (not shown) in a state where the clamp 11 is inserted into the pile main body 2 from the opening on the upper end surface of the pile 1, the clamp 11 is opened right and left or back and forth to expand. Clamp 11
Is opened in the pile main body 2 and the clamp 11 is pressed against the inner surface of the pile main body 2 so that the clamp 11 can grip the pile 1.

The two clamps 11, 11 respectively hold the piles 1, 1 into which the press-fitting is continuously performed, so that the pile press-in / pull-out machine 10 is supported on the piles 1, which are continuously press-fitted in a row. And a reaction force can be taken from the stakes 1 when the stakes 1 are press-fitted. Each of the clamps 11 has basically the same configuration as the clamp 11 of the well-known pile press-in and pull-out machine 10 for steel pipe sheet piles. Also, when the pile 1 is pressed in by taking a reaction force from the already inserted piles 1,1, a force is applied to the already inserted piles 1,1 in a direction in which the pile 1 is pulled out. In order to prevent the piles 1 and 1 from being pulled out, it is necessary to hold at least two piles 1 and 1 with the clamps 11 and, if possible, 3
It is preferred that more than one pile be gripped by the clamps 11,11.

In this example, the reaction force is taken from the two piles 1, 1 by the two clamps 11, 11. When the press-fitting of the pile 1 is started as described later by grasping the pile main body 2, one of the two piles 1, 1 gripped by the clamps 11, 11 by the chuck 17 of the second elevating body 18. The concrete part 3 of the rear pile 1 is grasped so that a reaction force can be obtained from the pile 1 as well.

Therefore, the pile press-in and pull-out machine of this example has the second chuck 17 even if there are only two clamps 11, 11.
, The reaction force can be taken from the three piles 1, 1. Therefore, two lifting bodies 1
Increase in cost due to the provision of 6 and 18 clamps 1
The number of 1 and 11 can be reduced by one.

The saddle 12 supports a slide portion 13 so as to be slidable back and forth by a hydraulic jack (not shown). As shown in FIGS. 3 and 4, the slide portion 13 has a thick cylindrical center pin 13a for rotatably supporting the revolving portion 14 at an upper portion thereof. 3 and 4, the turning portion 14 is shown in a see-through state in order to illustrate the center pin 13a.

The center pin 13a has a center gear 13b at the lower end, and is adapted to mesh with a motor gear 14a of the revolving portion 14, which will be described later. The turning portion 14 is provided with a center pin 13 of the slide portion 13.
a and an orbit motor 14b for rotating the turning portion 14 about the center pin 13a as a rotation axis.

The orbit motor 14 b
To the center pin 13
The motor gear 14 meshing with the center gear 13b of FIG.
When the orbit motor 14b is operated, the motor gear 14a rotates around the center gear 13b in the shape of a planetary gear, thereby rotating the turning portion 14.

As shown in FIG. 2, the first elevating body 16 is mounted on the front surface of the turning portion via two hydraulic cylinders 16a, 16a, and can be moved up and down by the hydraulic cylinders 16a, 16a. . The inner surface of the first chuck 15 of the first elevating body 16 except for the front surface of the first chuck 15 is cylindrical, and the inner surface of the first chuck 15 is formed by a hydraulic jack (not shown). It moves in the direction and sandwiches the cylindrical pile body 2.

That is, the first chuck 15 is dedicated to a cylindrical pile. The first chuck 1
5 is basically the same as a chuck of a pile press-in / draw-out machine for press-fitting a well-known steel pipe sheet pile, but the first chuck 15 of the pile main body 2 is arranged from the front side of the first chuck 15.
An opening 15a through which the pile main body 2 can pass is formed in the front part so that the pile body 2 can be attached to and detached from the pile body.

As shown in FIG. 2, the second elevating body 18 is attached to the rear surface of the swivel section via two hydraulic cylinders 18a, 18a, and can be moved up and down by the hydraulic cylinders 18a, 18a. . Accordingly, the first elevating body 16 and the second elevating body 18 are respectively attached to the opposite side surfaces of the turning part 14, and the turning part 14 is
By rotating by degrees, the position of the first elevating body 16 and the position of the second elevating body 18 can be exchanged.

The second chuck 17 of the second lift 18
Is formed in a U-shape with an open front side, and the left and right inner surfaces of the second chuck 17 are moved inward by a hydraulic jack (not shown) to sandwich the prismatic pile body 2. That is, the second chuck 17 is dedicated to the prismatic stake. The second chuck 17
Has basically the same configuration as a chuck of a pile press-in / draw-out machine for press-fitting a well-known rectangular column-shaped PC pile. An opening 17a through which the concrete part 3 can pass is formed on the front surface so that the concrete part 3 can be attached to and detached from the chuck 17.

Next, the above-mentioned pile 1 is connected to the above-mentioned pile press-in and pull-out machine 1.
A method of constructing a wall-like structure in which a wall-like structure is constructed by continuously press-fitting at 0 will be described. First, the basic operation of the above-mentioned pile press-in and pull-out machine 10 is as follows.
Pile body 2 from top surface of pile 1, 1 with press-fitted 1, 11
By inserting the clamps 11 and 11 with a hydraulic cylinder (not shown) and inserting them into the inside, the pile press-in / pull-out machine 1
0 is supported on the already inserted piles 1.

Then, with the first lifting member 16 positioned on the front side of the pile press-in / pull-out machine 10, the pile body 2 of the pile 1 to be pressed into the first chuck 15 of the first lifting member 16 from now on.
To be gripped. Next, the pile 1 is moved downward by pressing the first elevating body 16 downward from the state in which the first elevating body 16 is raised, and the pile 1 is press-fitted by one stroke of the first elevating body 16. .

Next, the pile body 2 using the first chuck 15
Of the pile 1 so as not to lift the pile 1, only the first elevating body 16 is raised, and again the first chuck 15
By holding the pile body 2 and lowering the first lifting / lowering body 16, the pile 1 is press-fitted for only one stroke described above. Then, the pile 1 is pressed in by repeating the above operation. When the pile 1 is press-fitted, the side of the concrete portion 3 of the pile 1 to be pressed next is brought into contact with the side of the concrete portion 3 of the pile 1 which has been press-fitted first.

Next, as shown in FIG.
When the first lifting member 16 is raised, the first lifting member 16 may hit the lower surface of the concrete portion 3 of the pile 1.
6, the gripping of the pile main body 2 by the first chuck 15 is released, and the sliding part is slid rearward as shown in FIG. Then, the second elevating body 18 is moved rearward.
At this time, since the front side of the first chuck 15 is open so that the pile main body 2 can pass through, the first elevating body 16 is moved rearward, so that the first elevating body 16 is moved. The (first chuck 15) and the pile 1 can be completely separated.

Next, the swivel unit 14 is turned 180 degrees to the left or right.
By rotating the first elevating body 16 on the front side of the pile press-in / pulling-out machine 10 to the rear side, the second elevating body 18 on the rear side is moved to the front side, As shown in FIG. 7, the position of the first lifting member 16 and the position of the second lifting member 18 are exchanged. In this case, by moving the slide portion backward as described above, the first lifting member 16 and the second lifting member 18 do not hit the pile 1 being press-fitted.

The second chuck 17 of the second elevating body 18 has a shape extending downward, and the second elevating body 18 that can move up and down is located at the lowest position. Since the lower end of the second chuck 17 is lower than the saddle 13, when rotating the turning part 14,
It is necessary to keep the second elevating body 18 up and down from its lowermost position.

Next, the sliding portion 13 is slid forward and the turning portion 14 is returned to the original position, thereby obtaining the position shown in FIG.
As shown in the figure, the second chuck 17 of the second lifting body 18
The state where the concrete portion 3 of the pile 1 is arranged in the pile 1 can be obtained. Since the front side of the second chuck 17 is open so that the concrete part 3 can pass through, the second chuck 18 can be moved forward to move the second chuck 17 forward as described above. 17 can be in a state where the concrete part 3 is arranged.

Next, the concrete part 3 of the pile 1 being press-fitted is gripped by the second chuck 17, and the pile 1 is moved downward as shown in FIG. It moves downward and press-fits the pile 1 for one stroke of the second elevating body 18.

Next, the gripping of the concrete portion 3 by the second chuck 17 is loosened so that the pile 1 is not pulled up, and only the second lifting member 18 is raised as shown in FIG. , The concrete part 3 in the second chuck 18
, And the second lifting member 18 is lowered as shown in FIG. 11 to press-fit the pile 1 for the one stroke described above. Then, the pile 1 is press-fitted by repeating the above-described operation, and as shown in FIG. 12, the pile 1 is inserted until at least a portion of the pile main body 2 below the concrete portion 3 is buried in the ground. Can be press-fit.

The pile 1 by the pile press-in / draw-out machine 10 described above.
In the basic operation of the press-fitting, the description has already been given in a state where a plurality of piles 1 have been driven in. However, when the first pile 1 is press-fitted,
Since the reaction force cannot be taken from the pile 1 already inserted, the pile 1 is pressed in with the pile press-in / draw-out machine 10 set on the pedestal, for example, using a heavy pedestal or the like dedicated to the pile press-in / pull-out machine 10. I do.

Further, in order to continuously press the pile 1 by the pile press-in / pull-out machine 10, it is necessary to advance the pile press-in / pull-out machine 10 on the piles 1 which have already been press-fitted. And
When the pile press-in / pull-out machine 10 is sequentially advanced and the piles 1 are sequentially press-fitted, first, as shown in FIG. Is moved to the front side of the pile press-in / pull-out machine 10.

Next, the slide portion 13 is slid forward, and the swivel portion 14 is moved by the first lifting body 16 to the next pile 1.
To a position where it can be pressed. Next, in this state, the pile main body 2 of the pile 1 to be press-fitted into the first elevating body 16 is set, and press-fitting by the first elevating body 16 is performed as described above.

At this time, the sliding portion 13 and the turning portion 1
It is necessary to start the press-fitting of the pile 1 with a large force in a state in which the pile 4 extends forward, and a large moment is applied to the pile press-in / pull-out machine 10, so that the two clamps 11, 11
It is difficult to support the pile press-in and pull-out machine 10 on the piles 1 and 1 by grasping the piles 1 and 1 which have already been press-fitted. In order to stably support the pile press-in and pull-out machine 10, three clamps 11 are required.
However, as described above, by gripping the pile 1 already pressed in with the second chuck 17 of the second lifting body 18 on the rear side, the second lifting body 18 And the pile press-in and pull-out machine 10 can be supported on the pile 1 in a stable state.

Next, at the stage where the pile 1 is pressed into a state where the load of the pile press-in / pull-out machine 10 can be supported, the first lifting / lowering body 16 is raised and the pile 1 The main body 2 is gripped, and the gripping of the piles 1, 1 by the clamps 11, 11 is released. In this state, the first elevating body 16 is fixed to the stake 1 that is being press-fitted, and the saddle 13 and the revolving part 14 have been fixed to the stakes 1 and 1 that have already been press-fitted. In this state, when the first elevating body 16 is operated to move downward, the saddle 13 side is lifted, and the clamps 11, 11 are raised upward from the inside of the pile bodies 2, 2 of the piles 1, 1. Becomes

In this state, when the slide portion 13 is further operated to move to the rear side, the saddle 13 moves forward so as to be drawn toward the stake 1 being press-fitted. Next, when the first elevating body 16 is operated to move upward, the saddle 13 moves downward, and the clamp 1 is moved.
The piles 1, 1 are shifted one before the pile 1, 1
Are inserted inside the pile main bodies 2 and 2.

Then, the stake 1,
5, the state shown in FIG. 5 is obtained, and the pile 1 can be pressed in as described above. Further, in the state shown in FIG. 5, the stake 1 being pressed is grasped by the first chuck 15 of the first elevating body 16, and the second elevating body 18 is lowered, and When the first lift 16 and the second lift 18 are operated to move upward in this state, the saddle 1 is gripped.
The portion 2 is pressed downward, and the two lower piles 1, 1 on the lower side of the saddle 121 can be pressed downward and slightly pushed in. That is, the first and second chucks 15, 1
The two piles 1, 1 on the lower side of the saddle 12 can be press-fitted by taking a reaction force from the piles 1, 1 gripped by 7.

By press-fitting the two piles 1 and 1 with the saddle 12, the top positions of the piles 1 and 1 already press-fitted can be easily assembled. That is, the heights of the top ends of the piles 1 and 1 can be easily adjusted. At this time, if the gripping of the piles 1, 1 by the clamps 11, 11 is released, the saddle 12 is pushed down as described above, so that the lower two piles 1, 1 can be adjusted to be equal.

As described above, the pile press-in and pull-out machine 10 of this example is
Can easily press-fit a single pile 1 with a steel pipe pile at the bottom and a concrete pile at the top. That is, conventionally, the shape of the chuck of the pile press-in / pull-out machine is different for each type of pile. In this example, the pile press-in and pull-out machine 10 has two lifting bodies 16 and 18 and two chucks 15 and 17, so that two types of piles can be press-fitted by one unit. Pulling can be easily performed, and even if the lower part is a steel pipe pile and the upper part is a concrete pile, as in the case of the pile 1 of the first example, it is necessary to replace the pile press-in / draw-out machine or remove and attach the elevating body. There is no need to perform this, and press-fitting can be easily performed.

Further, the pile 1 can construct a permanent wall-like structure instead of a temporary one like the conventional PC pile, and a steel pipe is used for the portion to be pressed into the ground. The tip resistance is lower than that of a pile, and it can be easily press-fitted. In addition, since the concrete portion that is relatively more expensive than the steel pipe is used only for the portion that is exposed from the ground above the pile 1, the cost of the pile 1 can be reduced.

Therefore, by constructing a wall-shaped structure using the pile 1 of this example, the cost can be further reduced as compared with the conventional PC wall construction method. Further, in the pile 1 of this example, since the diameter of the concrete portion 3 is larger than the diameter of the pile main body 2, the concrete portions 3 are continuously pressed into each other in a state where the concrete portions 3 are in contact with each other, so that the wall shape is increased. When a structure is constructed, the interval between the pile main bodies 2 is opened as shown in FIG. 1 and the like.

Therefore, even when the wall-like structure is constructed by the pile 1, the underground portion of the wall-like structure does not block the flow of the groundwater vein. Further, in a region where liquefaction is likely to occur, when the above-described wall-shaped structure is constructed, it is possible to prevent the flow of groundwater during an earthquake and prevent liquefaction from easily occurring.

In the above example, the case where the pile 1 is press-fitted has been described. However, if the operation of press-fitting the pile press-pulling-out machine 10 is reversed, the pile 1 can be pulled out. In the above example, the pile main body 2 is a steel tube.
Is not limited to a steel tube, and may be a well-known steel sheet pile shape, an H-shaped steel shape, or a steel material having another shape.

The shape of the concrete part is not limited to a prism. When the shape of the pile is changed, the chucks 15 and 17 also need to be changed corresponding to the pile. Further, the number of the elevating bodies 16, 18 and the chucks 15, 17 provided in the pile press-in / draw-out machine 10 are not limited to two, and may be three or more. In the above example, the front and rear surfaces of the wall-shaped structure formed by the pile 1 are both exposed, but the wall-shaped structure is used as a retaining wall, a revetment wall, or the like. For example, the rear side is covered with earth and sand.

[0060]

According to the pile according to the first aspect of the present invention, a large number of the piles are continuously driven in such a manner that the concrete portions abut against each other, whereby the above-mentioned conventional P-type pile is driven.
Like the C pile, a concrete wall-like structure can be easily constructed. In addition, when the above-mentioned pile is pressed in, the pile body made of a steel material is driven into the ground.
It is possible to press-in with a smaller pressure than when press-fitting a stake. Further, since only the upper part of the pile is made of concrete, the cost can be reduced as compared with the case where the entire pile is made of concrete, which is more expensive than steel.

Further, when a concrete wall-like structure is constructed with the above-mentioned piles, a large number of pile bodies driven into the ground act as foundation piles, and the wall-like structure can be made strong. In addition, when the concrete part is provided on the upper part of the pile main body, basically, the concrete part is formed around the upper part of the pile main body, so that the concrete part becomes thicker than the pile main body, and When piles are continuously press-fitted so that the piles contact each other, a space is left between the pile bodies in the continuously press-fitted ground.

Therefore, even if the piles are continuously pressed into a place where the groundwater level is relatively high, the space is provided between the pile bodies in the ground, so that the groundwater is formed by the wall-shaped structure. Blocking the flow of the pulse can be prevented.
Also, in an area where the groundwater level is high and liquefaction is likely to occur, such as a loose sandy ground, the possibility of liquefaction can be reduced by not disturbing the movement of the groundwater.

According to the method for constructing a wall-like structure according to the second aspect of the present invention, the same effects as those of the pile according to the first aspect can be obtained. According to the pile press-in / pull-out machine according to claim 3 of the present invention, the pile press-up / pull-out machine has a plurality of lifting / lowering bodies that can vertically move while holding the pile to press-fit or pull out the piles, and each lifting / lowering body is It is possible to press-in and pull-out different types of piles, and it is possible to switch between a plurality of elevating bodies by rotating the swivel part. Different types of piles can be handled by the pulling machine.

Also, as in the above-mentioned claim 1,
It is possible to easily press-fit a pile having a concrete part on the upper part of a pile body made of steel and in which one pile is connected to a pile made of steel and a concrete pile. Further, when press-fitting the pile using one of the plurality of lifting bodies, at least one of the remaining lifting bodies grasps the already pressed-in pile, so that the main body is Since the reaction force can be obtained not only from the part but also from the pile already pressed in by the elevating body, a sufficient reaction force can be obtained from the pile already pressed even if the configuration of the main body is simplified. Therefore, by simplifying the configuration of the main body, it is possible to suppress an increase in the cost of the pile press-in / draw-out machine due to the provision of the plurality of elevating bodies.

[Brief description of the drawings]

FIG. 1 is a side view in which a part of a pile showing a pile and a pile press-in / draw-out machine according to an embodiment of the present invention is seen through.

FIG. 2 is a plan view showing the pile and the pile press-in / draw-out machine of the above example.

FIG. 3 is a side view in which a part of the pile press-in and pull-out machine of the above example is seen through.

FIG. 4 is a plan view of a part of the pile press-in and pull-out machine of the above example, which is seen through.

FIG. 5 is a side view for explaining a method of constructing a wall-like structure using the pile and the pile press-in / pull-out machine of the above example.

FIG. 6 is a side view for explaining a method of constructing a wall-like structure using the pile and the pile press-in / pull-out machine of the above example.

FIG. 7 is a side view for explaining a method of constructing a wall-like structure using the pile and the pile press-in / pull-out machine of the above example.

FIG. 8 is a side view for explaining a method of constructing a wall-like structure using the pile and the pile press-in / pull-out machine of the above example.

FIG. 9 is a side view for explaining a method of constructing a wall-like structure using the pile and the pile press-in / pull-out machine of the above example.

FIG. 10 is a side view for explaining a method of constructing a wall-like structure using the pile and the pile press-in / pull-out machine of the above example.

FIG. 11 is a side view for explaining a method of constructing a wall-like structure using the pile and the pile press-in / pull-out machine of the above example.

FIG. 12 is a side view for explaining a method of constructing a wall-like structure using the pile and the pile press-in / pull-out machine of the above example.

[Description of Signs] 1 Pile 2 Pile body 3 Concrete part 10 Pile press-in / pull-out machine 11 Clamp (body part) 12 Saddle (body part) 13 Slide part (body part) 14 Revolving part 15 First chuck 16 First elevating Body 17 Second chuck 18 Second lifting body

Claims (3)

[Claims] 1. A pile driven into the ground with at least a part of the upper part exposed, comprising: a pile main body made of a steel material; and a concrete part provided on an upper part of the pile main body. Characteristic pile. 2. A method for constructing a wall-like structure by continuously driving a pile according to claim 1 to construct a wall-like structure, wherein at least a lower side of the concrete portion of the pile is buried in the ground. And a method of constructing a wall-like structure, wherein the piles are continuously driven so that the concrete portions of the adjacent piles come into contact with each other when the piles are continuously driven. 3. A pile press-in / pull-out machine for gripping a pile already driven and taking in or pulling out another pile while taking a reaction force from the pile, wherein the pile has already been driven and has a reaction force. A main body that takes up a stake, a revolving part provided rotatably left and right on the main body, and a side part of the revolving part that is vertically movable while gripping the pile, A plurality of elevating bodies for pulling out, wherein the plurality of elevating bodies are formed so as to be able to grasp different types of piles, respectively, and at the time of press-fitting and extracting the piles, by rotating the turning part, A pile press-in / pull-out machine characterized in that it can be used by switching a plurality of elevating bodies.