JP2020051172A - Pile driver and pile drive method - Google Patents

Abstract

To provide a pile driver and a pile drive method that can construct piles even in a small area.SOLUTION: A pile driver 1 that drives piles into the ground includes: a support column 10, the upper end of which has a first pulley 11 and the lower end of which has a second pulley 12, and that is placed on a ground G; and a wire body 20 that runs across the first pulley 11 and the second pulley 12. One end of the wire body 20 has a hammer 30 and the other end has a fixing part 40 that is fixed to a pile P. The first pulley 11 can approach and leave the second pulley 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pile driving machine and a pile driving method.

  BACKGROUND ART Conventionally, there is a pile driving machine that drives a pile into the ground by dropping a hammer and hitting the pile (for example, see Patent Document 1).

  However, since the conventional pile driver supports the hammer and the guide body for guiding the hammer at the tip of the boom of the heavy machine, the pile cannot be constructed in a narrow place where it is difficult to carry in the heavy machine. Was.

Japanese Utility Model Registration No. 2537768

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a pile driver and a pile driving method capable of constructing a pile even in a narrow place.

The present invention is grasped by the following configurations in order to achieve the above object.
(1) The pile driver of the present invention is a pile driver for driving a pile into the ground, has a first pulley at an upper end, and has a second pulley at a lower end, and is placed on the ground. A strut, and a cord spanned between the first pulley and the second pulley, the cord having a hammer at one end;
The other end has a fixing portion fixed to the pile.
(2) In the above (1), the first pulley can approach and separate from the second pulley.
(3) In the above (1) or (2), the support has a hydraulic cylinder and a piston rod that moves in and out of the hydraulic cylinder, and the pressure in the hydraulic cylinder is adjusted by a hydraulic pump. It is free.
(4) In the above (3), there is provided a control device for controlling the movement amount of the piston rod so as to be substantially half of the movement amount of the hammer.
(5) The pile driving method using the pile driving machine according to any one of (1) to (4), wherein the pile driving machine is installed near the pile, and the pile driving method is performed using the pile driving machine. Into the ground.

  According to the present invention, it is possible to provide a pile driving machine and a pile driving method capable of constructing a pile even in a narrow place.

It is a schematic diagram showing a pile driver concerning an embodiment. It is explanatory drawing which shows the pile driving method using a pile driver, and is a figure which shows the process of a pile driving method in order from (a) to (d).

(Embodiment)
Hereinafter, embodiments for carrying out the present invention (hereinafter, referred to as “embodiments”) will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram illustrating a pile driver 1 according to the embodiment.

As shown in FIG. 1, a pile driver 1 according to the present embodiment drives a pile P into the ground of the ground G, has a first pulley 11 at an upper end, and has a second pulley 12 at a lower end. And a cable 20 spanned between the first pulley 11 and the second pulley 12.
The pile P is, for example, a steel pipe pile, has a bottomed bore having a hitting surface Pa with which the hitting face 30a of the hammer 30 contacts, and the hammer 30 can be inserted through the bore. .
The cord 20 has a hammer 30 at one end and a fixing portion 40 fixed to the pile P at the other end.
The cord 20 is connected from the hammer 30 to the fixed portion 40, and is deflected by being wound around the first pulley 11 and the second pulley 12 on the way. The hammer 30 is hung from the rope 20, and the weight of the hammer 30 moves down the rope 20 and acts to push down the pile P vertically downward.
Then, in a state where the fixing portion 40 provided at the other end of the cord 20 is fixed to the pile P, the hammer 30 suspended at one end of the cord 20 is lifted high and then dropped freely, so that the hammer is dropped. A hit corresponding to the potential energy stored in 30 is given to the pile P, and the pile P can be driven into the ground G.
As described above, since the pile driving machine 1 has a simple structure having the columns 10 mounted on the ground G, even if the site where the pile P is installed is narrow, the pile driving machine 1 can be used without requiring heavy machinery. The machine 1 can be easily transported to the site and installed, and the pile P can be easily constructed on the ground G using the pile driver 1.
Hereinafter, the elements of the pile driver 1 will be described in more detail.

(Prop 10)
The column 10 is long and is placed on the ground G near the pile P in a vertical posture in which the longitudinal direction is vertical. In this manner, the column 10 only needs to be in a vertical position in the vicinity of the pile P, and is placed on the ground G, so that it is not necessary to transport the column by a heavy machine or the like or to provide special support. Therefore, according to the pile driver 1 having such a column 10, the pile P can be constructed even in a narrow place.
The column 10 has a column body 13 and a base 14 provided at a lower end portion of the column body 13 and in contact with the ground surface of the ground G and holding the column body 13 in a vertical position.

The support body 13 has a first pulley 11 at an upper end and a second pulley 12 at a lower end. Note that the support body 13 may have a guide portion (not shown) such as a rail for guiding the hammer 30 that moves up and down on the side portion.
The first pulley 11 and the second pulley 12 are formed in a disk shape so that the cable body 20 can be easily wound around the outer periphery, and are disposed on the column body 13 such that the central axis is substantially horizontal. Note that the second pulley 12 may be provided on a base 14 provided at a lower end portion of the column body 13. In addition, when the rope body 20 is a rope, the first pulley 11 and the second pulley 12 may be fixed so as not to rotate with respect to the column body 13 so that the rope can slide on the outer peripheral surface. Alternatively, the rope may be rotatably fixed to the support body 13 so that the rope can slide on the outer peripheral surface and can rotate with the movement of the rope. When the cable body 20 is a chain, the first pulley 11 and the second pulley 12 may be sprockets (gears) that mesh with the chain and are rotatable about a central axis.

  Each of the first pulley 11 and the second pulley 12 is formed by arranging pulleys of the same shape in a number corresponding to the number of the cords 20. In the present embodiment, since the number of the cords 20 is two (in FIG. 1, they are shown as one because they overlap), the first pulley 11 is provided with two pulleys having the same shape. Similarly, the second pulley 12 has two pulleys of the same shape. Thus, the cable body 20 can be arranged in a balanced manner on both sides (the front side and the back side with respect to the paper surface in FIG. 1) of the column body 13, and the weight of the hammer 30 is equally shared to allow the cable body 1 The cross-sectional area per book can be reduced. The number of the cords 20 may be one, and the numbers of the first pulley 11 and the second pulley 12 may be one.

The support body 13 has a hydraulic cylinder 13s by hydraulic pressure, hydraulic pressure, pneumatic pressure, or the like, and a piston rod 13p that moves forward and backward in the hydraulic cylinder 13s. The push-side (bottom-side) chamber 13sb and the return-side (piston rod-side) chamber 13su in the fluid pressure cylinder 13s are each connected to a fluid pressure pump Pump, and are configured by the fluid pressure cylinder 13s and the piston rod 13p. And the fluid pressure pump Pump form a fluid pressure circuit.
Here, the pressure in the fluid pressure cylinder 13s is adjustable, for example, by a fluid pressure pump Pump. The hydraulic pump Pump only needs to be capable of generating a force equal to or greater than twice the weight of the hammer 30 by the hydraulic cylinder 13s and the piston rod 13p, and may be, for example, a hydraulic pump driven by an electric motor. The first pulley 11 can approach and separate from the second pulley 12 by adjusting the pressure in the fluid pressure cylinder 13s.

  More specifically, for example, the hydraulic cylinder 13s is a double-acting cylinder having a return chamber 13su and a push chamber 13sb communicating with the hydraulic pump Pump. In particular, the push-side chamber 13sb is connected to a fluid pressure pump Pump via a throttle valve.

  Then, by operating the fluid pressure pump Pump or a valve in the fluid pressure circuit, the pressure of the push-side chamber 13sb of the fluid pressure cylinder 13s is suddenly reduced by rapidly opening the fluid pressure circuit, whereby the hammer 30 is moved. It can be freely dropped from the strike preparation position using gravity.

  Further, the flow rate of the fluid, particularly, the flow rate when returning the fluid from the push side chamber 13sb of the fluid pressure cylinder 13s to the fluid pressure pump Pump (retreating the piston rod 13p) is adjusted by the throttle valve, or the fluid is adjusted from the push side chamber 13sb. The amount of movement of the piston rod 13p after dropping the hammer 30 by bypassing to the return side chamber 13su or adjusting the flow rate of sending fluid from the hydraulic pump Pump to the return side chamber 13su of the hydraulic cylinder 13s. Can be controlled.

  By the way, the pile driver 1 has a control device (not shown) for controlling the moving amount (or moving speed) of the piston rod 13p to be substantially half of the moving amount (or moving speed) of the hammer 30. Is preferred. More specifically, it is known that the hammer 30 behaves almost the same as free fall due to gravity from the command timing of fluid pressure release in the fluid pressure circuit from the fluid pressure pump Pump to the fluid pressure cylinder 13s. From the pressure release command timing, the moving amount (or moving speed) of the piston rod 13p becomes substantially half of the moving amount (or moving speed) of the hammer 30, for example, the solenoid moving amount of the throttle valve, the fluid pressure pump. Control logic for controlling the angle of the swash plate of the pump or the rotation speed of an electric motor (not shown) for driving the fluid pressure pump Pump is set in the control device in advance.

  Here, since the cable body 20 is deflected by approximately 180 ° by the first pulley 11, the moving amount (or moving speed) of the hammer 30 becomes twice the moving amount (or moving speed) of the first pulley 11. Therefore, when the moving amount (or moving speed) of the first pulley 11 becomes half or more of the moving amount (or moving speed) of the hammer 30, the cord 20 is loosened and detached from the first pulley 11 or the second pulley 12. However, the control device controls the amount of movement (or the moving speed) when the piston rod 13p moves backward, so that the cable body 20 can be prevented from slackening.

The fluid pressure cylinder 13s is disposed on the ground G side, and a second pulley 12 is provided at a lower end of the fluid pressure cylinder via a base 14 as necessary.
The piston rod 13p is disposed above the fluid pressure cylinder 13s, and a first pulley 11 is provided at the upper end. The arrangement relationship between the fluid pressure cylinder 13s and the piston rod 13p may be upside down.
When the piston rod 13p moves forward and backward with respect to the fluid pressure cylinder 13s, the path of the cable body 20 from the second pulley 12 to the first pulley 11 becomes longer or shorter. The height position of the hammer 30 can be raised or lowered according to the change.

  The base 14 has an outer shape that is larger than the outer shape of the column main body 13 so that the base 14 is fixed to the column main body 13 and stably holds the posture of the column main body 13. Thereby, the support main body 13 is less likely to fall over, and the vertical posture of the support main body 13 can be maintained. Therefore, the pillar 10 can be more stably mounted on the ground G.

  Further, the base 14 is relatively non-rotatable with respect to the pile P, but may be attached so as to be relatively movable in the vertical direction. That is, although the base 14 is attached to the pile P, even if the pile P is driven into the ground G and moves, the base 14 remains on the ground surface of the ground G. Thereby, the support column body 13 can be supported via the base 14 attached to the pile P, so that the support column body 13 can be stably held without being supported by a special heavy machine or the like.

(Cord body 20)
The cable body 20 is, for example, a chain, a rope, or the like.
The cord 20 has one end connected to the hammer 30, is deflected by the first pulley 11 and the second pulley 12, and the other end is connected to the fixing portion 40. Note that the fixing portion 40 may be the other end of the cable body 20 itself.
The length of the cord 20, that is, the length from the hammer 30 where one end of the cord 20 is located to the fixing portion 40 where the other end of the cord 20 is deflected by the first pulley 11 and the second pulley 12. Is long enough for the hammer 30 to hit the pile P when the hammer 30 is dropped. Here, if the length of the cord 20 is too short, the cord 20 will be stretched when the pile P is hit, which hinders efficient transmission of potential energy from the hammer 30 to the pile P, If the length is too long, the cable body 20 may come off from the first pulley 11 or the second pulley 12, so that it has an appropriate extra length.
The number of the cords 20 is equal to the number of the first pulley 11 or the second pulley 12. In the present embodiment, the number of the cords 20 is two. The number of the cords 20 can be appropriately changed according to the weight of the hammer 30, the cross-sectional area per one cord 20, the elastic modulus, the allowable tensile force, and the like.

By the way, if the other end of the rope body provided with the hammer at one end is not a pile but a pile driver fixed to the pile driver side as in the related art, if the rope body is too short, The hammer cannot be dropped until the hammer hits it, and the cord may be impacted and the cord may be damaged.Therefore, the length of the cord will increase as the pile is driven into the ground. It is necessary to set a longer length in advance according to the position of the pile after the pile. On the other hand, if the length of the cord is set to be long, in the initial stage when the pile is driven into the ground, the cord is loosened when the hammer contacts the pile, and the cord is detached from the pulley There was a possibility.
On the other hand, according to the pile driving machine 1 according to the present embodiment, one end of the cord body 20 is connected to the hammer 30 and the other end is connected to the fixing portion 40 fixed to the pile P. Is lowered by being driven into the ground G, the position of the hammer 30 is also lowered accordingly, and the length of the support 10 (or the separation distance between the first pulley 11 and the second pulley 12) is reduced. Under the same conditions, the relative positional relationship between the hammer 30 and the pile P does not change. In other words, since the fixing portion 40 to which the other end of the cord body 20 is connected is fixed to the pile P, the hammer 30 moves the pile P with the movement of the pile P when the pile P is driven. Move by the same amount as.
Therefore, the distance between the hitting surface 30a of the hammer 30 at the highest position and the hitting surface Pa of the pile P, that is, the potential energy of the hammer 30 corresponding to the energy at the time of hitting can be made the same for each hit.
Therefore, the pile driving machine 1 can be designed compact with the energy at the time of hitting as the maximum output, and the maximum output can be output for each hit, so that the pile P can be hit efficiently. In addition, the length of the cord 20 at the moment of the impact when the hammer 30 contacts the pile P can be set to an appropriate length that is always constant and has no extra waste. Therefore, even when the pile P is driven down, it is not necessary to adjust the length of the cord 20 or change the position where the end of the cord 20 is fixed. It is possible to prevent the body 20 from loosening and coming off the first pulley 11 or the second pulley 12.

(Hammer 30)
The hammer 30 uses the potential energy to strike the pile P, and has a predetermined weight. As a material of the hammer 30, for example, steel, cast iron, lead, another alloy, or the like is used.
The hammer 30 is connected to one end of the cord body 20. The hammer 30 is hung from one end of the cord 20 wound around the first pulley 11 in a state where the longitudinal direction is a vertical posture.
The hammer 30 has a striking surface 30a at the lower end that can abut the struck surface Pa of the pile P.

(Soil improvement method)
Next, a ground improvement method including a pile driving method using the pile driver 1 according to the present embodiment will be described.
FIG. 2 is an explanatory view showing a pile driving method using the pile driving machine 1, and (a) to (d) are diagrams sequentially showing the steps of the pile driving method.

(1) First, the lower part of the pile P is buried in the prepared hole provided in the ground G, and the pile P is held in a vertical posture (pile temporary installation step).

(2) Next, the pile driver 1 is installed near the pile P (pile driver installation process).
Specifically, as shown in FIG. 1, the base 14 of the column 10 is attached to the pile P, and the column 10 is placed on the surface of the ground G. The base 14 may be fixed to the surface of the ground G with an anchor or the like. Next, the fixing part 40 is attached to the upper end of the pile P. Subsequently, the other end of the cord 20 is attached to the fixing portion 40, and is wrapped around the first pulley 11 and the second pulley 12, and the hammer 30 is attached to one end of the cord 20 and hung. In addition, when transporting the components of the pile driver 1 such as the strut 10, the cable body 20, the hammer 30, and the like, for example, the components may be carried on a small trolley or the like with the components down, and the large Does not require heavy equipment. In this way, the pile driver 1 is installed near the pile P, and the state is as shown in FIG.

(3) Next, the hammer 30 is moved to the hitting preparation position.
Specifically, first, the hammer 30 is inserted into the stake P by operating the fluid pressure pump Pump to raise and lower the piston rod 13p, and the height of the column 10 is adjusted so that the hammer 30 is in the hitting preparation position. To a state as shown in FIG. At this time, a part of the hammer 30 is inserted into the lumen of the pile P. The reason why the hammer 30 is inserted into the stake P is to use the stake P as a guide for the hammer 30. At this time, the first pulley 11 and the second pulley 12 are separated from each other, and the distance between the first pulley 11 and the second pulley 12 is the longest distance D1 at the time of impact. When the hit surface Pa is the upper end surface of the pile P, it is not necessary to insert the hammer 30 into the pile P.

(4) Next, the pile P is driven into the ground G using the pile driver 1 (pile driving process).
Specifically, from the state where the separation distance between the first pulley 11 and the second pulley 12 is the longest distance D1 at the time of impact (see FIG. 2A), that is, from the state where the height of the column 10 is substantially maximum. For example, the pressure in the push-side chamber 13sb of the fluid pressure cylinder 13s is rapidly released (the pressure release valve is opened). Then, a force twice as large as the weight of the hammer 30 acting downward on the first pulley 11 is applied to the first pulley 11 while being balanced with the force for advancing the piston rod 13p by the pressure of the push side chamber 13sb of the fluid pressure cylinder 13s. Then, the first pulley 11 is rapidly lowered, and the piston rod 13p is rapidly retracted. That is, the first pulley 11 and the second pulley 12 approach each other, and the height of the column 10 sharply decreases. Then, a speed twice as fast as the speed at which the first pulley 11 and the second pulley 12 approach (the speed at which the height of the column 10 decreases or the speed at which the first pulley 11 descends) is faster than the falling speed of the hammer 30. For example, the hammer 30 descends while being accelerated by gravity. Then, the striking surface 30 a at the lower end of the hammer 30 hits the struck surface Pa of the pile P, and the energy of the hammer 30 is transmitted to the pile P. At this time, the separation distance between the first pulley 11 and the second pulley 12 is the shortest distance D2 at the time of impact, as shown in FIG. Thereby, the pile P lowers slightly from the position of the pile P in FIG.
From the state where the distance between the first pulley 11 and the second pulley 12 is the longest distance D1 at the time of impact, the operation of suddenly releasing the pressure in the push-side chamber 13sb of the fluid pressure cylinder 13s (opening the pressure release valve) is as follows. Alternatively, the control may be performed so as to be automatically performed by using the trigger that the piston rod 13p advances by a predetermined length as a trigger.

Here, a speed twice as fast as the speed at which the first pulley 11 and the second pulley 12 approach (the speed at which the height of the column 10 decreases, or the speed at which the first pulley 11 descends) is smaller than the speed at which the hammer 30 falls. If the speed is too high, the cord 20 may be loosened, and the cord 20 may come off the first pulley 11 or the second pulley 12. On the contrary, if the speed twice as fast as the speed at which the first pulley 11 and the second pulley 12 approach each other is lower than the falling speed of the hammer 30, the hammer 30 is moved upward by the cable 20 wound around the first pulley 11. The pile P is dropped and the falling speed is limited, and the pile P may not be hit efficiently.
Therefore, it is preferable that the hydraulic pump Pump control the amount of movement when the piston rod 13p retreats to be approximately half the amount of movement when the hammer 30 falls.
Thereby, the cable body 20 can be prevented from loosening and coming off the first pulley 11 or the second pulley 12. Moreover, the pile P can be hit efficiently.

(5) Next, the piston rod 13p is moved forward to separate the first pulley 11 and the second pulley 12 from each other until the maximum distance D1 at the time of impact is reached, as shown in FIG. ).
Then, the hammer 30 attached to one end of the cable body 20 wrapped around the first pulley 11 and the second pulley 12 rises and reaches the hitting preparation position. At this time, the fixing portion 40 provided at the other end of the cord 20 is fixed to the pile P, and the length of the cord 20 is fixed. 2 (c)) is lower than the batting preparation position before the batting (see FIG. 2 (b)) by the same amount as the moving amount of the pile P lowered by the batting.

(6) Then, as described in (4), when the pile P is driven into the ground G by using the pile driver 1 again, the pile P has a resistance due to the ground G as shown in FIG. 2C, it is slightly lowered as compared with the position of the pile P in FIG.
Then, the pile P is gradually lowered by sequentially repeating (4) and (5). Then, when the predetermined criterion is satisfied, the pile driving method ends.
As described above, by using the pile driver 1, pile driving can be performed even in a narrow place, and ground improvement can be performed.

(7) In order to drive the pile P deeper (longer), the pile P may be divided into a plurality in the depth direction (longitudinal direction).
In this case, the length of each pile P is, for example, about 1 m. The first pile P1, which is first driven into the ground G and is the lowest, has a bore through which the hammer 30 can be inserted and is a bottomed tubular body having the bottom surface 30a as the hitting surface. The part is pointed so as to be V-shaped or U-shaped in side view.
The second stake P2 connected to and connected to the first stake P1 is a tubular body having a lumen through which the hammer 30 can be inserted. The third stake P3 connected and connected to the second stake P2 is connected to the hammer 30. Similarly, the n-th pile Pn connected to and connected to the (n-1) -th pile Pn-1 is a tubular body having a lumen through which the hammer 30 can be inserted.
Further, the continuous piles P may be connected by welding. Note that a female screw provided on one pile P and a male screw provided on the other pile P may be screw-connected, and an engaging groove provided on one pile P is provided on the other pile P. The fixing pins may be connected to each other by inserting and engaging the fixing pins from the pin insertion holes.
Then, the first hammer 301, the second hammer 302,..., The (n-1) th hammer 30n-1 and the nth hammer 30n having the same length and the same number as the length of each stake P are prepared. The hammer 30 has a length equal to the length of the pile P to be constructed.

(8) Subsequently, the first pile P1 is driven into the ground G by repeating the steps (4) to (5). Then, when the upper end of the first pile P1 reaches near the ground of the ground G, one end of the cord 20 is removed from the upper end of the first hammer 301, and the upper end of the first hammer 301 is connected to the upper end of the first hammer 301 by, for example, screw connection. Two hammers 302 are connected.

(9) Connect one end of the cable body 20 to the upper end of the second hammer 302.

(10) The fixed part 40 to which the other end of the cord 20 is connected is removed from the upper end of the first pile P1.

(11) The second pile P2 is connected to the upper end of the first pile P1, for example, by screw connection.

(12) The fixing part 40 to which the other end of the cord 20 is connected is fixed to the upper end of the second pile P2.

(13) The piles P are gradually lowered by sequentially repeating the above (4) and (5).

(14) The steps (8) to (13) are repeated until the n-th pile Pn is constructed.
In this way, the pile P can be driven deeper (longer) using the pile driver 1. At this time, since the length of each pile P and the length of each hammer 30 can be accommodated in a predetermined length regardless of the depth (length) of the pile P to be cast, even in a narrow place, It can be easily transported and constructed. When the hit surface Pa is near the ground of the ground G, the energy of the hammer 30 (hitting energy) is relatively small, so that the vibration and noise can be reduced, and the energy of the hammer 30 is compared as the construction proceeds. Even if the target surface becomes large, the hit surface Pa moves away from the ground of the ground G, so that an increase in vibration and noise can be suppressed.

  As described above, the present invention has been described using the embodiments. However, it is needless to say that the technical scope of the present invention is not limited to the scope described in the above embodiments. It is apparent to those skilled in the art that various changes or improvements can be made to the above embodiment. It is apparent from the description of the appended claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

In the above embodiment, the column 10 is composed of the fluid pressure cylinder 13s and the piston rod 13p, and the first pulley 11 provided at the upper end of the column 10 is the second pulley provided at the lower end of the column 10. Although the pile driver 1 which can approach and separate from the 12 has been described, the present invention is not limited to this.
For example, in the pile driving machine 1, the support 10 is a simple rod having a constant length, and the first pulley 11 provided at the upper end of the rod is the second pulley provided at the lower end of the rod. It may not be possible to approach or separate from the pulley 12.
In this case, in order to raise the hammer 30 to the hitting preparation position, for example, the rope 20 between the first pulley 11 and the second pulley 12 is pulled laterally by an operator or a device, and thereby the first haul 30 is pulled up. What is necessary is just to lengthen the path | route of the cable | cord | chord body 20 from the pulley 11 to the 2nd pulley 12. Then, when the worker stops pulling in the lateral direction suddenly, the path of the elongated cord body 20 returns to its original state, and the hammer 30 falls from the strike preparation position, and can strike the pile P. Then, the pile P can be driven into the ground G by repeating this process.
As described above, the hammer 30 can be moved up and down only by lengthening or shortening the path from the first pulley 11 to the second pulley 12 without limiting to lengthening or shortening the column 10. P can be repeatedly hit to ground G.

  According to the pile driver 1 and the pile driving method of the present invention, the pillar 10 having the first pulley 11 at the upper end, the second pulley 12 at the lower end, and the pillar 10 mounted on the ground G, A cable body 20 spanned between the pulley 11 and the second pulley 12. The cable body 20 has a hammer 30 at one end and a fixing portion 40 fixed to the pile P at the other end. Since the pile driver 1 is used, no heavy equipment is required, and the pile P can be constructed even in a narrow place.

DESCRIPTION OF SYMBOLS 1 Piling machine 10 Prop 11 First pulley 12 Second pulley 13 Prop main body 13p Piston rod 13s Fluid pressure cylinder 13sb Push side chamber 13su Return side chamber 14 Base 20 Cord 30 Hammer 30a Striking surface 40 Fixed portion D1 Longest distance D2 at impact Shortest distance G at impact G Ground P Piles Pa Impacted surface Pump Fluid pressure pump

Claims (5)

A pile driver for driving a pile into the ground,
The pile driver is
A support having a first pulley at an upper end and a second pulley at a lower end, and mounted on the ground;
A cable body spanned between the first pulley and the second pulley,
The cord is
At one end, have a hammer,
A pile driver having a fixing portion fixed to the pile at the other end. The pile driver according to claim 1, wherein the first pulley is movable toward and away from the second pulley. The support has a hydraulic cylinder, and a piston rod that moves forward and backward in the hydraulic cylinder,
The pile driver according to claim 1 or 2, wherein the pressure in the hydraulic cylinder is adjustable by a hydraulic pump. 4. The pile driver according to claim 3, further comprising a control device that controls a movement amount of the piston rod to be substantially half of a movement amount of the hammer. 5. In a pile driving method using the pile driving machine according to any one of claims 1 to 4,
Installing the pile driver near the pile,
Driving the pile into the ground using the pile driver.

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