JP2005090035A - Plastic board drain driving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a casing for driving a plastic board drain, to penetrate a hard layer that cannot be penetrated by normal driving operation. <P>SOLUTION: Clamping claws 37, 37 are opposedly disposed with a shift passage of the casing 8 held between, and the clamping claws 37 are linked with press-in cylinders 31. A hydraulic circuit of the press-in cylinder is provided with a pressure accumulating part 6 and a partition valve 7. When penetration resistance becomes large during driving the casing, the partition valve 7 is closed. The supply of operating oil to the press-in cylinder 31 is intercepted, and the operating oil is accumulated in the pressure accumulating part 6. When the partition valve 7 is opened, the operating oil rapidly flows into the press-in cylinder 31 by the accumulated pressure to rapidly lower the clamping claw 37. Rapid load is thereby applied to the casing 8. Since the rapid load is theoretically the double of object weight, the casing 8 can penetrate the hard layer of large penetration resistance. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plastic board drain placing machine used for improving soft ground.

A plastic board drain is placed on a soft ground, and water in the ground is discharged through the plastic board drain to improve the ground.
As shown in FIG. 1, the plastic board drain driving machine (1) has a tower (12) standing on a self-propelled carriage (11) and a casing driving device (2) below the tower (12). .
As shown in FIG. 9, the conventional casing driving device (2) is provided with clamp claws (37) and (37) which are arranged opposite to each other across the transition path of the casing (8) and are close to each other, and the clamp claws approach each other. The clamping cylinders (36) and (36) for clamping the casing (8), and the press-fitting cylinder (31) for raising and lowering the clamping cylinder (36) (Patent Document 1).

The casing (8) is clamped by both clamp claws (37) and (37), and the clamp claws (37) and (37) are lowered by the press-fitting cylinder (31).
The casing (2) is driven into the ground for the stroke of the press-fitting cylinder (31).
With the clamp on the casing (8) released, the clamping claws (37) and (37) are raised to the original position by the press-fit cylinder (31), and the casing (8) is clamped again by the clamping claws (37) and (37) To do.
The above operation is repeated to drive the casing (8) to a predetermined depth of the ground.

Even if the cylinder (31) for press-fitting of the casing driving device (2) has a high output, if the penetration resistance to the ground of the casing (8) is large, the plastic board drain driving machine (1 ) There was a risk that it would lift itself from the ground and fall.
Therefore, it was meaningless to provide a press-fit cylinder (31) with a high output enough to overcome the weight of the plastic board drain placing machine (1).
Therefore, conventionally, before casting the casing (8), the steel plate is driven by vibration to perform advance penetration, and after the hole is made in the hard layer, the casing (8) is driven. In this method, work efficiency is poor, and there is a problem of generating vibration and noise at the time of preceding penetration.
Japanese Utility Model Publication No. 63-823

  Even if the penetration resistance to the ground of a casing is large, this invention makes it a subject to enable driving | running | working of a casing, without carrying out prior penetration by a shape steel.

  The plastic board drain placing machine (1) according to the present invention is provided with a casing driving device (2) on a carriage (11), and the casing (8) into which the plastic board drain (9) is inserted is used as the casing driving device (2). In the plastic board drain driving machine (1) driven into the ground by means of the casing driving device (2), clamp claws (37) and (37) which are arranged across the transition path of the casing and can be approached and separated from each other, and the clamp claws Working oil for obtaining a force in the caulking direction in the press-fitting cylinder (31). The press-fitting cylinder (31) and a hydraulic pressure generator (5) connected to the press-fitting cylinder (31). A pressure accumulating section (6) is provided in the flow path (51) for sending the gas, and the pressure accumulating section (6) side is provided between the pressure accumulating section (6) and the press-fitting cylinder (31) of the flow path (51). A relief valve (71) is provided on the gate valve (7) and the press-fitting cylinder (31) side.

When the penetration resistance increases during casing placement, the gate valve (7) is closed and the relief valve (71) is opened. The flow of working oil to the press-fitting cylinder (31) is blocked by the gate valve (7), and the working oil is stored in the pressure accumulating section (6) and stored.
The working oil in the flow path (51) between the gate valve (7) and the press-fitting cylinder (31) is removed from the relief valve (71).
Next, when the relief valve (71) is closed and the gate valve (7) is opened, the working oil quickly flows into the press-fitting cylinder (31) due to the accumulated pressure, and the pressure in the press-fitting cylinder (31) rises rapidly. To do. For this reason, a downward rapid load acts on the casing (8). Since the rapid load is theoretically twice the weight of the object, that is, the weight of the plastic board draining machine, the casing ( 8) can be penetrated.
Prior to placing the casing (8) as before, there is no need to make a hole in the hard layer by making a prior penetration of the steel mold into the ground by vibration. Can be done automatically. Moreover, a heavy machine for leading penetration is unnecessary, and the cost for placing the plastic board drain can be reduced. In addition, there is no problem of vibration or noise during the previous penetration.

FIG. 1 shows a plastic board drain placing machine (1). The placing machine (1) is provided with a tower (12) in a self-propelled carriage (11), and a casing is driven in a lower part of the tower (12). The device (2) is provided.
The casing driving device (2) of the embodiment is constituted by a first driving device (3) and a second driving device (4) located below the first driving device (3).

The second driving device (4) is configured by arranging a plurality of pairs of friction rollers (41) across the driving transition path of the casing (8) vertically supported in the tower (12). The casing (8) is clamped by 41), and the casing (8) is driven on the ground by the rotation of the friction roller (41).
If the second driving device (4) is soft ground, the casing (8) can be driven continuously.

As shown in FIGS. 2, 3, and 4, the first driving device (3) has two press-fit cylinders (31) arranged downward on the mounting frame (30), and both press-fit cylinders (31) ( 31) The base (32) is supported across the downward piston rod (31a) (31a).
In the center of the base (32), a hole (35) is formed through which the casing (8) passes with a margin.

Four levers (39) (39) (39a) (39a) are provided at the four corners of the base (32).
The base (32) passes through the pivots (33) (33) in parallel to both press-fitting cylinders (31) (31), and the central part of the lever (39) is located at both ends of each pivot (33). It is pivotally supported.
The upper ends of the levers (39), (39), (39a), and (39a) facing each other in the same rotation plane are connected by the clamping cylinders (36) and (36).
The pins (34) (34) are inserted across the lower ends of the levers (39) (39a), (39) (39a) adjacent to each other across the base (32).

Below the base (32), a pair of clamp claws (37) and (37) are arranged opposite to each other across the driving transition path of the casing (8), and the base ends of both clamp claws (37) and (37) are the pins. (34) Supported by (34).
The clamp claws (37) and (37) are slidably fitted to a U-shaped support frame (38) that is suspended from the base (32), and rotate downward about the pin (34). The sagging is prevented.
When the piston rod (36a) of the clamp cylinder (36) protrudes, the clamp claws (37) and (37) approach each other, and the casing (8) can be clamped.

FIG. 5a shows a hydraulic circuit for controlling the press-fitting cylinder (31). The control valve (52) connected to the hydraulic pressure generator (5) and the piston rod protruding port (51a) of the press-fitting cylinder (31) are shown. ) Are connected by the first flow path (51), and the control valve (52) and the piston rod retracting port (53a) of the press-fitting cylinder (31) are connected by the second flow path (53).
The control valve (52) returns the working oil from one of the two flow paths (51) and (53) to the oil tank of the hydraulic pressure generator (5) when the working oil is sent to one of the flow paths. Play a role.
In the first flow path (51), a pressure accumulating section (6), a gate valve (7), and a relief valve (71) are provided in this order from the control valve (52) side to the press-fitting cylinder (31).
The pressure accumulating section (6) is provided as close as possible to the press-fitting cylinder (31).
The pressure accumulating section (6) of the embodiment is a known diaphragm type accumulator.
The gate valve (7) and the relief valve (71) are electromagnetic valves having a high response speed.

Therefore, the case where the casing (8) is driven only by the first driving device (3) of the casing driving device (2) will be described.
The casing (8) is clamped by the clamp claws (37) and (37) of the first driving device (3).
A plastic board drain (9) is inserted into the casing (2) from its upper end, pulled out from the casing lower end opening (80), and passed through the anchor (81).
The anchor (81) is applied to the casing opening (80) (FIG. 2).

As shown in FIG. 5a, the discharge side of the control valve (52) is switched to the first flow path (51), the gate valve (7) is opened, and the relief valve (71) is closed. Operate.
The working oil flows into the press-fitting cylinder (31), and as shown in the graph of FIG. 6, the piston rod (31a) of the cylinder (31) is gradually projected to start the driving operation of the casing (8). When a certain time has elapsed after the driving operation is started, the ground penetration input of the casing (8) by the press-fitting cylinder (31) becomes constant.
As the piston rod (31a) is lowered, the clamp claws (37) and (37) are also lowered together with the base (32). If the slip of the clamp claw (37) and the casing (8) is ignored, the casing (8) clamped by the clamp claw (37) (37) is also driven into the ground by the lowering amount of the clamp claw (37). become.

After the clamp claws (37) and (37) are lowered, the clamp cylinder (36) is operated to release the clamp on the casing (8) by the clamp claws (37) and (37).
Switch the discharge port of the control valve (52) to the second flow path (53) and retract the piston rod (31a) of the press-fit cylinder (31) to place the base (32) and the clamp claws (37) (37) in their original positions. To rise.
By repeating the above operation, the casing (8) is intermittently driven into the ground.

When the casing (8) hits a hard layer that cannot be penetrated during the driving operation of the casing (8), the gate valve (7) is closed and the relief valve (71) is opened as shown in FIG. 5b. The working oil supplied from the hydraulic pressure generator (5) compresses the gas in the accumulator (61). As a result, pressure is accumulated in the accumulator (61).
The working oil in the flow path (51) between the gate valve (7) and the press-fitting cylinder (31) is discharged from the relief valve (71) to an oil tank (not shown) of the hydraulic pressure generator (5).
As shown in FIG. 6, the penetration force of the press-fitting cylinder (31) suddenly becomes zero.

  Next, as shown in FIG. 5c, the relief valve (71) is closed and the gate valve (7) is opened. The working oil rapidly flows into the press-fitting cylinder (31) by the pressure accumulation by the accumulator (61), and the press-fitting cylinder (31) rises to a predetermined pressure all at once. As a result, a rapid load acts on the casing (8). Since the rapid load is theoretically twice the weight of the object, the casing (8) can be penetrated into the hard ground without lifting the plastic board drain placing machine (1).

  The accumulator (61) was moved as close as possible to the press-fit cylinder (31) because the protective hose forming the working oil flow path between the press-fit cylinder (31) and the accumulator (61) was made as short as possible. This is because the resistance when the working oil passes through the hose is reduced, and the hose diameter is increased by the high-pressure working oil to prevent the effect of the rapid load from being impaired.

  Prior to placing the casing (8) as before, there is no need to make a hole in the hard layer by making a prior penetration of the steel mold into the ground by vibration. Can be done automatically. In addition, there is no problem of vibration or noise during the previous penetration.

After the casing (8) is driven to a predetermined depth, the casing driving device (2) is operated reversely to the above, and the casing (8) is pulled out.
The plastic board drain (9) in the casing (8) is prevented from being lifted by the anchor (81) and is left on the ground together with the anchor (81).
The plastic board drain placing machine (1) is moved and the plastic board drain (9) is placed in the same manner as described above.
As is well known, moisture in the ground is discharged through the plastic board drain (9).

  When the second driving device (4) by the friction roller (41) is provided as in the embodiment, the driving of the casing (8) to the soft ground is intermittently performed by the first driving device (3). Instead of driving, it can be carried out continuously by the second driving device (4). The casing (8) can be pulled out efficiently by rotating the friction roller (41) in the reverse direction.

FIG. 7 shows the operation of the hydraulic circuit in which the relief valve (71) is omitted from the above embodiment.
As shown in FIG. 7a, the hydraulic pressure generator (5) is operated with the gate valve (7) on the working oil flow path (51) leading to the press-fitting cylinder (31) open.
The working oil flows into the press-fit cylinder (31), and as shown in the graph of FIG. 8, the piston rod (31a) of the cylinder (31) is gradually projected to start the casing (8) driving operation. When a certain time has elapsed after the driving operation is started, the ground penetration input of the casing (8) by the press-fitting cylinder (31) becomes constant.

After the clamp claws (37) and (37) are lowered, the clamp cylinder (36) is operated to release the clamp on the casing (8) by the clamp claws (37) and (37).
In the same manner as described above, the piston rod (31a) of the press-fitting cylinder (31) is retracted, and the base (32) and the clamp claws (37) (37) are raised to their original positions.
By repeating the above operation, the casing (8) is intermittently driven into the ground.

During the above operation, when the casing (8) hits a hard layer that cannot penetrate, the gate valve (7) is closed as shown in FIG. 7b. In the same manner as described above, pressure is accumulated in the accumulator (61).
As shown in FIG. 8, the penetration force of the press-fit cylinder (31) gradually decreases due to leakage of working oil from the press-fit cylinder (31) or the like.

  Next, the gate valve (7) is opened. The working oil rapidly flows into the press-fitting cylinder (31) by the pressure accumulation by the accumulator (61), and the press-fitting cylinder (31) rises to a predetermined pressure all at once. As a result, a rapid load acts on the casing (8), and the casing (8) can be penetrated into the hard ground without raising the plastic board drain placing machine (1) in the same manner as described above.

  The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.

  For example, the accumulator (61) may be of a weight type, a spring type, or a gas compression type. Even if it is a gas compression type, it does not matter whether it is a separation type as in the embodiment or a direct pressure type. Furthermore, even with the separated type, it can be implemented with an accumulator of a piston type, a metal bellows type, a bladder type, an in-line type, etc. in addition to the diaphragm type.

It is a front view of a plastic board drain placing machine. It is a front view of a 1st driving device. It is a side view same as the above. It is a slope view same as the above. 1 shows a hydraulic circuit linking a hydraulic pressure generator and a press-fitting cylinder. FIG. A shows a state in which a gate valve is opened for normal driving, FIG. B shows a state in which the gate valve is closed for pressure accumulation, and FIG. The gate valve is opened after pressure accumulation for driving. It is a graph which shows the change of the penetration input of the cylinder for press injection. The hydraulic circuit of another embodiment is shown, in which FIG. A shows a state in which the gate valve is opened for normal driving, FIG. B shows a state in which the gate valve is closed for pressure accumulation, and FIG. The gate valve is open. It is a graph which shows the change of the penetration input of the cylinder for press injection same as the above. It is a front view of the casing driving device of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plastic board drain placement machine 2 Casing driving device 3 1st driving device
31 Cylinder for press fitting
32 base
36 Cylinder for clamping
37 Clamp claw 4 Second driving device 5 Hydraulic generator
51 Flow path 6 Pressure accumulator 7 Gate valve
71 Relief valve

Claims (3)

In the plastic board drain driving machine (1), the casing driving device (2) is arranged on the carriage (11), and the casing (8) in which the plastic board drain (9) is inserted is driven into the ground by the casing driving device (2). The casing driving device (2) includes clamp claws (37) and (37) which are arranged across the transition path of the casing and can approach and separate from each other, a press-fitting cylinder (31) for moving the clamp claws up and down, and the press-fitting An oil pressure generator (5) connected to the cylinder (31), and a pressure accumulating section (6) in a flow path (51) for sending working oil to obtain force in the casing driving direction to the press-fitting cylinder (31). Between the pressure accumulating section (6) and the press-fitting cylinder (31) of the flow path (51), the gate valve (7) on the pressure accumulating section (6) side, and the cylinder on the press-fitting cylinder (31) side. Plastic board drain placing machine equipped with a relief valve (71). In the plastic board drain driving machine (1), the casing driving device (2) is arranged on the carriage (11), and the casing (8) in which the plastic board drain (9) is inserted is driven into the ground by the casing driving device (2). The casing driving device (2) includes clamp claws (37) and (37) which are arranged across the transition path of the casing and can approach and separate from each other, a press-fitting cylinder (31) for moving the clamp claws up and down, and the press-fitting The hydraulic pressure generator (5) is connected to the cylinder (31), and the pressure accumulating section (6) is provided in the flow path (51) for sending the working oil for obtaining the force in the casing driving direction to the press-fitting cylinder (31). A plastic board drain placing machine in which a gate valve (7) is provided between the pressure accumulating section (6) of the flow path (51) and the press-fitting cylinder (31). The plastic board drain placing machine according to claim 1 or 2, wherein the pressure accumulating section (6) is a diaphragm type accumulator (61).

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