JPH0626578Y2 - Pile driver leader vertical correction mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a leader vertical correction mechanism for a pile driver.

[Conventional technology]

Generally, when a pile driver is used to drive ready-made piles into the ground for construction work, or to perform ground improvement, underground wall, or perforation for driving steel sheet pile, the ground is not always horizontal. Sometimes it is an inclined surface. Since the pile driver riding on the inclined surface is inclined in parallel with the inclined surface, the leaders arranged upright on the pile driver are also inclined at the same angle. Therefore, this inclined leader must be corrected to the vertical line before the construction starts.

The conventional pile driving machine has taken the following means as a method of correcting the leader on the vertical line in the field on the inclined surface.

That is, as one method, although not shown, a middle part of the leader is suspended by using a jib, and then the lower part of the leader is connected to a support member projecting forward of the pile driver, and the support member is connected. It was corrected on the vertical line by adjusting the movement in the front-back and left-right directions.

As another method, although not shown, the lower part of the leader is supported by the front part of the pile driver, and then the middle part of the leader is erected from the pile driver in a C-shape. While supporting it at the tip, the leader was corrected vertically by the expansion and contraction operation of the left and right legs.

[Problems to be solved by the device]

However, the vertical correction mechanism of the leader in the conventional pile driver has the following problems.

In the former case, the lower part of the leader whose middle part is suspended by a jib is corrected to the vertical line by moving the support member projecting forward of the pile driver in the front-back and left-right directions. The center of gravity of the leader often deviated from the center line of the pile driver, which made the pile driver less stable.

In the latter case, since the middle part of the leader is supported by the tips of the two telescopic legs that are erected in a V-shape, the pile driver body that serves as a support body for the leg base has a C-shape for both leg bases. Since a width corresponding to the spreading direction is required, the pile driver becomes large and expensive.

In the former, the lower surface of the leader is directly contacted with the ground, and in the latter, a jack grounded to the ground is mounted on the bottom of the leader to support the load applied to the leader, but when this ground is soft and sinks due to the load, In both cases, it was difficult to maintain the verticality and stability of the reader.

This invention has been made in order to solve the above-mentioned problems, and its purpose is to ensure that the center of gravity of the leader does not come off on the center line of the pile driver main body without fail,
It is an object of the present invention to provide a leader vertical correction mechanism for a pile driver, which can maintain the stability and downsizing of the pile driver and can easily maintain the verticality and stability of the leader even on soft ground.

[Means for Solving the Problems]

In order to achieve the above object, in the leader vertical correction mechanism of the pile driver according to the present invention, the lower part of the leader is supported so as to be able to move up and down, and the tip of the jib which is erected on the main body of the pile driver is in the middle of the leader. And an automatic hinge for adjusting the angle to the left and right is provided in the middle of the jib.

[Action]

When using a pile driver equipped with a vertical correction mechanism with the above configuration, for example, when performing work such as pile driving on a sloped surface, the ground is a sloped surface, Since the machine body and the leader incline by the slope of the ground, this leader must be adjusted to the vertical line before the work. At that time, for example, when the ground slope is an inclined surface that descends to the side of the pile driver main body, first, the lower part of the leader is released from the ground by extending a hydraulic cylinder or the like,
When the upper part of the jib supporting the middle part of this leader is bent to the side opposite to the slope descending surface of the ground by the operation of the automatic hinge to change the angle, the leader held by the tip of this jib The center of the leader is on the center line of the pile driver at the same time because the angle is changed to a vertical line that matches the center point of the pile driver based on the lower support point to obtain a reliable vertical mode. You can move to. At this point, if the hydraulic cylinder supporting the lower part of the leader is contracted, the lower part of the leader on the vertical line that coincides with the center point of the pile driver can be easily and surely placed on the ground, so that the pile can be positioned at the desired position. It is possible to drive in a stable manner under such a vertical manner.

〔Example〕

An embodiment in which the present invention is applied to a pile driving machine of a drain pipe construction method will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a pile driver A is a leader 1 located on the front side of a pile driver main body A ₁ which can be driven by a track or the like.
Two guides 6 parallel to the vertical direction are mounted on the front vertical surface of the. An auger rotating device 7 is fitted in the guide 6 so as to be vertically movable. Sprockets 9 and 10 are housed in the upper and lower positions of the leader 1, and an endless chain 11 is suspended between the sprockets 9 and 10. The chain 11 is configured such that the drive device 12 installed at the lower end of the reader 1 can move the chain in the ascending or descending direction.
The auger rotating device 7 is connected to the chain 11. Therefore, when the drive device 12 is operated, the auger rotation device 7 is attached so as to move up and down integrally with the guide 6 while being fitted in the guide 6.

An auger 8 having perforations and stirring blades attached to the peripheral surface of the aerial tube is integrally rotatably connected to the lower portion of the auger rotating device 7 as described above. Note that the loading and unloading work associated with the pile driving work is configured to be performed by the wire rope 14 having the base end wound around the winch 13 mounted on the rear portion of the pile driver main body A ₁ .

The leader 1 according to the above-described mode is erected at the time of work by holding the jib 3 arranged upright on the upper side of the pile driver main body A ₁ , adjusting the angle to the left and right, or raising and lowering forward and backward. In the pile driver A assembled so that the mode can be maintained and the position can be moved and the tools can be attached and detached before and after the work, the leader vertical correction mechanism according to the present invention is configured as follows. There is.

That is, as shown in FIGS. 1 to 5, the reader 1 has a bracket 17 provided at one end of the lower part thereof,
On the tip side of the guide 15 projecting from the front of the pile driver main body A ₁ , between the movable frame 16 loosely inserted so as to be able to expand and contract in the horizontal direction by operating the internal hydraulic cylinder 19, It is supported by a hydraulic cylinder 2 arranged upright so that it can be raised and lowered.

In this case, in the leader 1, by fitting the lower flange 18 to the moving frame 16, the slidable contact of the flange 18 enables vertical correction on the inclined surface.
It is configured to be able to move up and down with high precision.

In addition, the jib 3 standing upright in the middle zone on the pile driver main body A ₁
As shown in FIG. 4, the tip of the bracket 4 is attached to the upper part of the reader 1 in the vertical direction at the middle part thereof.
Is swingably connected by loose insertion of a pin or the like.
The jib 3 is configured to be able to be tilted in the front-back direction by operating a hydraulic cylinder 5 arranged between the pile driver main body A ₁ and its lower end.

Further, as shown in FIG. 5, the middle part of the jib 3 is divided into upper and lower parts, and the jib 3 can be bent in the horizontal direction at this position by the connection by loosely inserting the pins to both ends. A hinge 20 is formed. A hydraulic cylinder 21 is connected between the ends on one side of the hinge 20. Hinge 20 and hydraulic cylinder 21 of this aspect
Thus, the automatic hinge B for changing the angle of the jib 3 in the left-right direction is formed, and is configured as a leader vertical correction mechanism of the pile driver as a whole.

Next, the vertical correction of the reader according to the present invention will be described with reference to FIGS. 6 and 7.

Note that C shown in FIGS. 6 and 7 is an inclined surface having a slope in the construction area, D is a vertical line orthogonal to the horizontal reference plane E, and θ is an inclination with respect to the horizontal reference plane E. Surface C
Is an angle indicating the degree of the gradient of.

Using the pile driving machine A equipped with the vertical correction mechanism having the above-mentioned configuration, for example, as shown in FIG. 6, work such as pile driving is performed on the inclined surface C having the inclination of the angle θ with respect to the horizontal reference plane E. When the inclined surface C descends to the side of the pile driver main body A ₁ , the pile driver main body A riding on the slope C
₁ and the leader 1 incline to the side (right side in the figure) inclining by the angle θ of the ground. Therefore, the reader 1 must be corrected on the vertical line D before the work.

In that case, first, the lower part of the leader 1 is extended by releasing the hydraulic cylinder 2 arranged between the bracket 17 and the moving frame 16 and released from the ground, and then the jib 3 supporting the middle part of the leader 1 is moved. When the upper body is bent by the operation of extending the hydraulic cylinder 21 of the automatic hinge B so as to be bent to the side (the left side in the figure) opposite to the slope C on the side where the ground descends, the tip of this jib 3 The leader 1 held by means of a vertical line that coincides with the center point of the pile driver main body A _{1 based on} the lower support point (the connection support point between the lower part of the hydraulic cylinder 2 and the moving frame 16). Since the angle can be changed on D to correct it in a reliable vertical manner, the center of gravity of the leader 1 can also be moved to the center line of the pile driver main body A _{1 at} the same time. (Refer to FIG. 7) An inclinometer (not shown) for measuring the lateral inclination of the pile driver main body A _{1 is} attached to a part of the leader 1, and the hydraulic cylinder 21 of the automatic hinge B is automatically adjusted by this measurement value. The reader 1 can always be automatically held on the vertical line D when it is configured to be extended.

Further, when the inclined surface C descends to the front or the rear of the pile driver main body A ₁ , the lower portion of the leader 1 is hydraulically arranged between the bracket 17 and the moving frame 16 as described above. After the cylinder 2 is extended and released from the ground, the hydraulic cylinder 5 is operated to raise or lower the jib 3, or the moving frame 16 located at the front part of the pile driver main body A ₁ is moved to the hydraulic pressure inside the guide 15. By operating the cylinder 19 to expand / contract and tilting the leader 1 in the front-back direction, the leader 1 can be easily, surely and quickly corrected to a vertical form that matches the vertical line D. .

When the leader 1 is corrected on the vertical line D which coincides with the center line of the pile driver main body A ₁ as described above, when the hydraulic cylinder 2 supporting the lower portion of the leader 1 is contracted, the leader is in a completely vertical manner. Since No. 1 can be easily and surely applied to the ground under the state, the pile or the like can be stably driven to a desired position immediately after this in a completely vertical manner.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

In other words, the leader vertical correction mechanism of the pile driver by this effect supports the lower part of the leader so that it can be moved up and down. Therefore, when moving and turning the pile driver and vertically correcting the leader, push up the leader upward, Since the operation of the pile driver and vertical correction of the leader can be performed easily and reliably, the function of the pile driver can be improved, and at the time of the pile driving operation, the leader is placed on the ground to significantly reduce the load on the main body of the pile driver. it can. Therefore, even if the ground is submerged, it will not be affected even by a weak construction site, and the stability of the pile driver can be improved.

In addition, since an automatic hinge is provided in the middle of the jib, the vertical correction of the leader can be easily and reliably performed even on the inclined surface that descends to the side of the pile driving machine main body, and the accuracy of pile driving can be ensured, and The safety of the driving machine can be improved, and the pile driving machine can be downsized, so that the construction cost of the driving machine can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a side view of a pile driver equipped with a leader vertical correction mechanism according to the present invention, and FIG. 2 is a detailed view of part I in FIG.
FIG. 3 is a sectional view taken along the line XX ′ in FIG. 2, and FIG.
Detailed view of the II part in the figure, Figure 5 is a detailed view of the III part,
FIG. 6 is an explanatory view of the pile driver on the inclined surface that slopes down to the side of the main body of the pile driver before the vertical correction of the leader, and FIG. 7 is an explanation of the pile driver after the vertical correction of the leader. It is a figure. 1 ... Leader, 2, 21 ... Hydraulic cylinder 3 ... Jib, 4 ... Bracket 20 ... Hinge, A ... Pile driver A ₁ ... Pile driver body, B ... Automatic hinge

Claims (1)

[Scope of utility model registration request] 1. A pile driver for holding a leader with a jib,
The lower part of the leader is liftably supported, and the tip of the jib erected on the main body of the pile driver is swingably connected to the middle part of the leader, and the angle of the jib is adjusted left and right. A leader vertical correction mechanism for a pile driver, which is equipped with an automatic hinge.