JPH0959979A - Pile-driver unit and pile-driver with unit thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drop a drop hammer under the state closer to free falling by protruding an engaging arm from the drop hammer along a leader, vertically moving a movable member along a hydraulic cylinder and connecting the engaging arm to a cylinder device. SOLUTION: A hammer lifting device 3 is installed to a guide rod 62 vertically movably by two pairs of engaging arms 34 protruded from the left and the right of a support frame 33 in a section lower than a hammer device 2. One end of a piston rod is mounted on the support frame 33. A hammer receiver 8 is projected from the support frame 33 at a place, where the lower end of a drop hammer 21 collides when the drop hammer 21 drops.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile driver unit and a pile driver for freely dropping a drop hammer to drive a pile or the like.

[0002]

2. Description of the Related Art Conventionally, in a pile driving unit that utilizes the dead weight of a drop hammer (7) to drive a pile by free fall of the drop hammer (7), as shown in FIG. A device is known that controls the elevation of the drop hammer (7) by expanding and contracting the piston rod of the hydraulic cylinder device (71) that is linked to the upper end and is slidably attached to the guide rod (62) of the leader (61). There is. However, with this device, the drop hammer (7)
When free-falling, the load resistance of the hydraulic cylinder device (71) lowers the hammer falling speed, resulting in a lower pile driving force. Further, the hydraulic cylinder device (71) may be damaged by the impact when the drop hammer (7) is dropped. Therefore, as shown in FIG. 10, the drop hammer (7) and the hydraulic cylinder device (72) are separated during free fall, and the load of the hydraulic cylinder device (72) is not applied to the drop hammer.
An apparatus for free-falling (7) is disclosed in JP-A-54-154104. The operation of this device is such that the drop hammer (7) is located below the cylinder (74) slidably attached to the guide rod (62) of the leader (61), and the hydraulic cylinder device (72 ) Extend the piston rod,
Push the drop hammer (7) up. When the piston rod is further extended, the taper plug portion (73) provided on the upper end of the drop hammer (7) is fitted with the taper receiving surface (75) formed on the upper portion of the cylindrical body (74) to drop the drop. The hammer (7) is temporarily held above the cylindrical body (74). In this state, the piston rod is contracted and the drop hammer (7) is hung above.
Next, when the pump (76) supplies lubricating oil to the contact part between the taper receiving surface (75) and the taper plug part (73) to reduce the friction resistance of the contact part, the taper receiving surface (75) is retained. The ability drops and the drop hammer (7) falls freely. By repeating this operation, the drop hammer (7) is raised and lowered.

[0003]

However, when the drop hammer (7) is lifted and held above, if the method of the above configuration is adopted, for example, the drop hammer (7) is
It is conceivable that the surface of the taper receiving surface (75) and the surface of the taper plug portion (73) become sticky with the lubricating oil when the lifting and lowering are repeated, and the holding force is weakened. Also, hydraulic cylinder device
If there is a change in the lifting height of the drop hammer (7) due to (72), the taper plug part (73) does not fit sufficiently on the taper receiving surface (75) and the drop hammer (7) falls, There is a possibility that the drop hammer (7) will not drop if it is fitted too tightly and the lubricating oil is supplied. Also, when pile driving, depending on the hardness of the ground, the type of pile to be driven, etc.
When it is necessary to change the driving force of the pile, the drop start height of the drop hammer (7) is always maintained by the taper receiving surface (75) fixed inside the cylinder if the pile driving unit has the above configuration. Since it was constant, the pile driving force could not be changed.

In view of the above circumstances, an object of the present invention is that the load of the hydraulic cylinder device is not applied to the drop hammer when the drop hammer falls freely, and the drop hammer is disengaged from the hydraulic cylinder device reliably and easily. (EN) Provided are a pile driver unit capable of adjusting the drop start height of a drop hammer and a pile driver equipped with the unit.

[0005]

In order to solve the above problems, the pile driver unit (1) of the present invention drops an engaging arm (23) to be attached so as to be vertically movable along a leader (61). A hammer device (2) protruding from the hammer (21) and a hammer device (2) arranged above or below the hammer device (2).
A hammer raising device (3) having a movable member (32) for moving up and down in the vicinity of the movable member and a raising and lowering means (31) for the movable member (32), and one of the hammer device (2) and the movable member (32), The engaging member (42) protruding and retracting into the other transition path and the driving means (41) for retracting and engaging the engaging member (42) are provided, and the other engaging member (42)
The engagement / disengagement device is provided with an engagement receiving member (43) that engages with the engaging member (42) when it protrudes and is disengaged when retracting. The upward movement of the drop hammer (21) is driven by the drive means (41).
The engaging member (42) is projected toward and engaged with the engaging receiving member (43) by this, and the movable member (32) is raised in this state to integrate the movable member (32) and the drop hammer (21). Raise to. Also, the free fall of the drop hammer (21) is
This is performed by retracting (42) to release the engagement between the engagement member (42) and the engagement receiving member (43).

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. The pile driver unit (1) of the present invention is an engaging / disengaging device.
By (4), the tip of the movable member (32) of the hammer lifting device (3) and the drop hammer (21) are engaged, and the drop hammer (21) is lifted to a desired height by the lifting of the movable member (32). It is a device for freely dropping the drop hammer (21) and driving a pile or the like into the ground by releasing the engagement by the detaching device (4).

The pile driver (10) of the present invention, as shown in FIG.
A well-known reader (6) that can stand vertically in front of the traveling carriage (6)
It is constructed by deploying the pile driver unit (1) in 1). The leader (61) has two guide rods (62) (62) parallel to the front part, and the sprocket (64) (64) and the leader (61) are provided at the upper and lower ends inside the leader (61). An endless chain (63) is provided that meshes with the chain drive means (65) included in
It runs by driving the chain drive means (65).

FIG. 1 is an enlarged view of a main part of a pile driver unit (1) of the present invention, and FIG. 2 is a plan view thereof. Pile driver unit (1)
Is a hammer device (2) with a drop hammer (21)
And the lower end of the piston rod is fixed by the chain connecting tool (35), and the cylinder is slidably vertically penetrated through the hammer device (2) to be disposed below the hammer device (2). A hammer raising device (3) having a raising and lowering means using a hydraulic cylinder device (31a) which is a movable member (32) for raising (2) along a leader (61), and a movable member (32).
And a disengagement device (4) for engaging and disengaging the drop hammer (21).

As shown in FIG. 1, the hammer device (2) includes a substantially cylindrical drop hammer (21) and the drop hammer.
(21) Two pairs of engaging arms (23) which project from both sides of the connecting frame (22) integrally provided with (21) and which mount the drop hammer (21) vertically movable along the guide rod (62), It is composed of a plurality of limit switches (5) for detecting the drop start height of the drop hammer (21). The four engaging arms (23)
It holds two guide rods (62) slidably. Also, the drop hammer (2) is supported by the engaging arm (23) while the hammer device (2) is supported by the guide rod (62).
A passage (24) through which a movable member (32) of a hydraulic cylinder device (31a) described later appears and disappears is formed between the chain (63) and the chain (63) in parallel with the guide rod (62). . The drop hammer (21) projects downward from the tip of the connecting frame (22), and the lower surface of the drop hammer collides with the upper surface of the hammer receiver (8) described later when it freely falls.

The hammer device (2) includes a drop hammer.
In order to adjust the drop start height of (21), a rod (25) is provided in parallel with the leader (61) as shown in FIG.
(25) A contact type limit switch corresponding to the position detecting piece (39) provided on the hammer lifting device (3) described later.
A plurality of (5) are attached at predetermined intervals. Limit switch (5)
The tip of the contact piece (50) of the above-mentioned contact piece (50) projects into the transition path of the position detection piece (39) projecting from the hammer lifting device (3) described later.
As shown in FIG. 4, each limit switch (5) is connected to an electric circuit (51) that controls a pump that adjusts the amount of oil supplied to a hydraulic cylinder device (31a) and an engagement / disengagement cylinder device (41a) described later. It

The electric circuit (51) is a CPU as shown in FIG.
A limit switch detection circuit (52) for detecting ON / OFF of each limit switch (5) centering on (54) and a pump (57) for feeding oil to a hydraulic cylinder device (31a) described later.
A drop hammer connected to the pump control circuit (53) and the CPU (54) for controlling the
A pile driver unit (1) or a pile driver, which comprises a memory (56) that stores input data such as the drop start height of (21).
It is deployed at an appropriate position in (10). From the input means (55),
The user inputs the set height and operations such as operation start / stop of the pile driver (10). The drop start height of the drop hammer (21) is performed by selecting the limit switch (5) at a desired height, and when the user selects the desired limit switch (5), the limit switch (5) is selected. )
When comes into contact with the position detection piece (39) and is turned on, the pump control circuit (53) controls the pump (57) to stop the supply of oil to the hydraulic cylinder device (31a).

As shown in FIG. 1, the hammer lifting device (3)
Below the hammer device (2), the support frame (3
The guide rod (62) is vertically movably mounted by two pairs of engaging arms (34) protruding from the left and right of (3). Support frame
The hydraulic cylinder device (31a) is attached to the guide rod (62) in (33).
One end of the piston rod is attached so as to be supported in parallel along. A chain connector (35) for connecting to the endless chain (63) of the leader (61) is connected to the support frame (33) between the left and right engaging arms (34). Further, when the drop hammer (21) is dropped, a hammer receiver (8) is formed so as to project from the support frame (33) at a position where the lower end of the hammer collides. The hydraulic cylinder device (31a) has a support frame (3
It consists of a piston rod fixed to 3) and a cylinder that is a movable member (32), extends upward in parallel with the leader (61), and reciprocates according to the output signal of the pump control circuit (53). Supply of oil to the hydraulic cylinder device (31a)
Performed by pump (57). Hammer receiver (8)
The drop hammer (21) is formed at a position where the lower surface of the hammer hits when the drop hammer (21) falls freely along the guide rod (62). Further, the hammer receiver (8) is a support frame formed parallel to the guide rod (62) between the engaging arms (34).
It is slidably attached to the two rails (30) of (33). In addition, drop hammer (2
A cushion (81) is provided at a position where 1) collides, and a cap (82) for supporting the head of the pile (60) is provided on the lower surface. Furthermore, hammer receiver
In (8), there is a position detection piece (39) for adjusting the drop start height of the drop hammer (21), and the tip of the contact piece (50) of the limit switch (5) when the drop hammer (21) moves upward. Is provided so as to abut.

Drop hammer (21) and hammer receiver
The position and the protruding length of (8) are such that when the drop hammer (21) falls and comes into contact with the hammer receiver (8), the engaging arms (of the hammer device (2) and the hammer lifting device (3) ( 23) and (34) do not collide with each other, and drop hammer (21) and hammer receiver
When the piston rod of the hydraulic cylinder device (31a) is contracted most in the state where (8) is in contact, the upper end of the movable member (32) is beyond the engagement member (42) of the engagement / disengagement device (4) described later. Is also adjusted to be located below.

Drop hammer of the hammer device (2)
(21) At the upper end, as shown in FIGS. 1 and 2, the engagement / disengagement device (4)
The engaging member (42) and the driving means (41) are provided. The drive means (41) is an engagement / disengagement cylinder device (41a) capable of retracting the piston rod toward the upper end of the passage (24). When the engagement / disengagement cylinder device (41a) extends, the piston rod moves into the passage (2
When the upper end of 4) is closed and the engagement / disengagement cylinder device (41a) is contracted, the piston rod disengages from the passage (24) and opens the passage (24). Further, the upper end of the movable member (32) of the hydraulic cylinder device (31a) of the hammer lifting device (3) serves as an engagement receiving member (43) which abuts when the engagement member (42) is projected.

The operation of the pile driver unit (1) having the above structure and the pile driver (10) equipped with the unit will be described with reference to the flow charts of FIGS. 5, 6 and 7. First, make sure that the tip of the pile (60) fits into the cap (82) of the hammer receiver (8).
By the chain drive means (65) of the leader (61), the chain (6
3) is driven, and the pile (60) is statically pressed into the ground by the static load applied to the pile (60) through the hammer receiver (8). In this state, the hammer receiver (8) is attached to the rail (3) of the support frame (33).
It is located above 0) (Fig. 6).

<Start> The lower end of the drop hammer (21) is in contact with the upper surface of the hammer receiver (8), and the hydraulic cylinder device (31a) and the engagement / disengagement cylinder device (41a) are contracted.
For the pile driver unit (1) in this state, the user inputs the drop start height of the drop hammer (21) (select the desired limit switch (5)) from the input means (55), and then starts pile driving. Is input (step 1).

<Drop Hammer Lift> Next, oil is sent from the pump to the engagement / disengagement cylinder device (41a), and the engagement / disengagement cylinder device (41a) is extended as shown in FIG.
The passage (24) is closed by the protrusion of (2) (step 2). afterwards,
Oil is sent from the pump to the hydraulic cylinder device (31a), the hydraulic cylinder device (31a) is extended, and the movable member (32) is raised (step 3, FIG. 7). The movable member (32) rises in the passage (24) of the hammer device (2), and the engagement receiving member (43) at the upper end of the movable member (32) closes the passage (24). 42) abut. When the movable member (32) is further raised, the movable member (32) of the hydraulic cylinder device (31a) and the hammer device (2) are locked by the engaging member (42), and the hammer device is locked.
(2) is lifted up along the guide rod (62). When the hammer device (2) rises, the position detecting piece (39) and the limit switch (5) come into contact with each other. The limit switch detection circuit (52) detects that the hammer device (2) has risen to a desired height (step 4, FIG. 7). In response to the output from the limit switch detection circuit (52), the CPU (54) sends an instruction to stop the oil supply of the pump (57) to the pump control circuit (53) to extend the hydraulic cylinder device (31a). Stop (step 5).

<Drop Hammer Drop> Next, the engagement / disengagement cylinder device (41a) is reduced (step 6, FIG. 7), and the engagement member (42) is retracted. As a result, the passage (24) of the hammer device (2) is fully opened, and the engagement receiving member of the movable member (32).
(43) is disengaged and the hammer device (2) becomes the guide rod.
Free fall along (62). The lower end of the drop hammer (21) collides with the upper surface of the hammer receiver (8) of the hammer lifting device (3) and pushes the hammer receiver (8) downward. The hammer receiver (8) pushed in moves downward along the rail (30), and the pile (60) arranged below and fitted in the cap (82) of the hammer receiver (8) is driven into the ground. Be done. The hydraulic cylinder device (31a) has an upper end lower than the engagement / disengagement cylinder device (41a) during and / or after the hammer device (2) is dropped after the engagement / disengagement cylinder device (41a) is unlocked. (Step 7, FIG. 8). The chain (63) of the leader (61) is driven downward again by the driving amount of the pile, and the hammer receiver (8) is again positioned above the rail (30), and then the process returns to step 2. By repeating the above steps, the drop hammer (21) moves up and down, and the pile (60) is driven into the ground.

The description of the above embodiments is for the purpose of illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof.
The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

For example, in the above example, the passage (24) in which the movable member (32) appears and disappears is opened in the hammer device (2), but the movable member (32) moves up and down in the vicinity of the outside of the hammer device (2). You may let me. Also, limit switch (5) and position detection piece (39),
One of the engagement member (42) and the engagement receiving member (43) of the engagement / disengagement device (4) is the hammer device (2) and the other is the hammer lifting device.
You can attach it to (3). Also, hydraulic cylinder device (31a)
The cylinder may be attached to the support frame (33) so that the piston rod moves up and down. Further, the drop start height of the drop hammer (21) is
The stop height in a) can be arbitrarily adjusted by the user's operation.

[0021]

According to the pile driver unit (1) having the above structure, the hydraulic cylinder device is provided when the drop hammer (21) is dropped.
Since the load resistance of (31a) is not applied, drop hammer
(21) can be dropped in a state closer to free fall. In addition, the drop hammer (21) and the hydraulic cylinder device (31
The engagement / disengagement of the movable member (32) in (a) is performed by the engagement / disengagement cylinder device (41a).
Since it is due to the protrusion and retreat of the engaging member (42) using, it is reliable and easy. Also, the hydraulic cylinder device (31
The drop start height of the drop hammer (21) can be adjusted by changing the expansion and contraction length of the movable member (32) of a).

[Brief description of drawings]

FIG. 1 is an enlarged side view of a main part of a pile driver unit according to the present invention.

FIG. 2 is a sectional view taken along the line XX of FIG.

FIG. 3 is a side view in which the pile driver unit of the present invention is attached to a reader.

FIG. 4 is a diagram showing an electric circuit of the pile driver unit of the present invention.

FIG. 5 is a flowchart showing a flow of operations of the pile driver of the present invention.

FIG. 6 is a view showing a pile driving operation of the pile driver unit of the present invention.

FIG. 7 is a view showing a pile driving operation of the pile driver unit of the present invention.

FIG. 8 is a diagram showing a pile driving operation of the pile driver unit of the present invention.

FIG. 9 is a cross-sectional view of a conventional pile driver unit.

FIG. 10 is a cross-sectional view of a conventional pile driver unit.

[Explanation of symbols]

 (1) Pile driver unit (10) Pile driver (2) Hammer device (21) Drop hammer (3) Hammer lifting device (31a) Hydraulic cylinder device (4) Engagement device (41a) Engagement cylinder device (61) ) Leader (62) Guide rod

Claims (2)

[Claims] 1. A hammer device (2) having an engaging arm (23) projecting from a drop hammer (21) to be attached so as to be vertically movable along a leader (61), and above or below the hammer device (2). And a movable member (32) which is arranged in the vicinity of the hammer device (2) and moves up and down in the vicinity of the hammer device (2).
Hammer lifting device with lifting means (31) for (32)
(3), one of the hammer device (2) and the movable member (32), an engaging member (42) protruding and retracting in the other transition path, and a drive means (41) for retracting the engaging member (42). ) Of the engaging member (4)
The movable member (32) is composed of an engagement / disengagement device (4) provided with an engagement receiving member (43) that engages with the engaging member (42) when projecting 2) and is disengaged when retracting. Engages with the engagement member (42) and the engagement receiving member (43) to raise the drop hammer (21), and the engagement / disengagement device (4) is opened to remove the drop hammer (21). Pile driver unit characterized by free fall. 2. A pile driver equipped with an elevating means for vertically moving the hammer device while vertically mounting a hammer device along a leader standing upright from a trolley, along a leader (61). Engagement arm to be attached so that it can move up and down
Hammer device with (23) protruding from the drop hammer (21)
(2), a movable member (32) arranged above or below the hammer device (2) and moving up and down in the vicinity of the hammer device (2), and the movable member
Hammer lifting device with lifting means (31) for (32)
(3), one of the hammer device (2) and the movable member (32) is provided with an engaging member (42) protruding and retracting in the other transition path, and a driving means for retracting the engaging member (42). On the other hand, on the other hand, an engagement / disengagement device (4) provided with an engagement receiving member (43) which engages with the engaging member (42) when the engaging member (42) projects and is disengaged when retracting. The movable member (32) is moved upward by the engagement of the engagement member (42) and the engagement receiving member (43) to move the drop hammer (21) upward, and the disengagement device (4). ) Is a pile driver equipped with a pile driver unit that allows the drop hammer (21) to fall freely.