JPH0523624Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a vibrohammer that makes it possible to drive oblique piles.

(Prior Art) When driving piles vertically into the ground in civil engineering work, various pile drivers such as diesel hammers and vibro hammers are used.

However, when driving piles diagonally so that they have a certain inclination angle to the ground (the piles used in this case are called diagonal piles), diesel hammers,
Only specific pile drivers such as drop hammers and steam hammers were used; vibro hammers were rarely used.

(Problem that the invention aims to solve) One of the reasons for this is that vibration and friction between the inclined main leader and the vibro hammer attached to it can damage these equipment. A more important reason is that it is difficult to supply lubricating oil when the vibro hammer is tilted.

That is, when driving a pile perpendicular to the ground, as shown in FIG. An appropriate amount of lubricating oil is supplied to the rotating shaft 4.

However, when driving diagonal piles, the case body 1 will be tilted as shown in FIG.
The eccentric weight body 2 does not reach the liquid level of the lubricating oil 3, making it impossible to scrape up the lubricating oil 3, and the bearing supporting the rotating shaft 4 will burn out.

Therefore, it may be possible to store a sufficient amount of lubricating oil 3 at the bottom of the case body 1 from the beginning so that even if the case body 1 is tilted, the eccentric weight body 2 can reach the liquid level of the lubricating oil 3. .

However, in this case, when the eccentric weight body 2 rotates, it is subjected to large resistance, making it impossible to apply sufficient vibration energy to the pile.

In the end, because of the above, it was not possible to easily realize a vibro hammer capable of driving oblique piles.

The present invention was developed in view of the above circumstances, and its purpose is to prevent damage to equipment due to vibrations, friction, etc., and to drive slanted piles that can provide a stable supply of lubricating oil even when tilted. The purpose of the present invention is to provide a vibro hammer for installation.

(Means for Solving the Problems) The present invention, as a means to achieve the above object, includes a sub-leader for vibration damping that is slidably attached to the main leader in the diagonal pile driving direction, and a sub-leader that is slidable on the sub-leader. An eccentric weight case body which is movably mounted and which internally holds the rotating shaft of the eccentric weight via a radial bearing and a thrust bearing is supported by a shock absorber suspended from a wire rope, and the eccentric weight is supported by a shock absorber suspended from a wire rope. a lubricating oil dripping port opening at a position above the bearings in the main body of the case for the eccentric weight; A lubricating oil suction pump capable of sucking up lubricating oil stored at the bottom of the main body to the lubricating oil dripping port, and a lubricating oil suction pump that is disposed inside the case body for the eccentric weight body and capable of sucking up lubricating oil stored at the bottom of the main body to the lubricating oil dripping port. A funnel member for supplying lubricating oil to the bearing member.

(Function) In this configuration, since the case body containing the eccentric weight body is attached to the main leader via the sub-leader, damage to the equipment due to vibration, friction, etc. is prevented.

In addition, since a lubricating oil suction pump is provided, even if the case body 1 is tilted, the lubricating oil stored at the bottom is sent to the dripping port above by the pump. Since the lubricating oil dripping from the dripping port is supplied to the bearing member through the funnel member, smooth rotation of the eccentric weight body is maintained.

That is, as shown in FIG. 9, when the case body 1 is not tilted, the lubricating oil 3 is scraped up by the rotation of the eccentric weight body 2 itself, but when it is tilted as shown in FIG. 10, the lubricating oil 3 is not absorbed. It is supplied to the rotating shaft 4 (to be precise, the bearing member) by the lifting pump 5.

Since this suction pump is driven by the rotation of the rotation shaft of the eccentric weight, there is no need to add a new drive source. Further, it does not require a very large capacity to suck up the lubricating oil to the dripping port. Therefore, since this suction pump needs to be small, the load on the rotating shaft does not increase significantly, and there is almost no problem in terms of space.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 8.

Figure 7 is a schematic diagram showing the entire slanted pile driving device.
This figure shows a vibrohammer 7 attached to a main leader 6 of a work boat 8 and associated equipment. Of course, it goes without saying that this vibrohammer can be used both at sea and on land.

FIG. 8 is an enlarged view of a part of FIG. 7, in which the vibro hammer 7 includes a case body 1 attached to the main leader 6 via a sub-leader 8;
It is composed of a vibration motor 9, a chuck 10 for gripping a slanted pile, and the like. Note that 11 is a shock absorber suspended and supported by a wire rope extended from a winch of the work boat S.

Furthermore, FIGS. 1 and 2 are a longitudinal cross-sectional view and a cross-sectional view showing the structure around the case body 1 in FIG. 8. Therefore, first of all, Figures 1, 2 and 3
A basic embodiment of the present invention will be described based on the drawings.

As shown in FIG. 2, a pedestal 12 is attached to the case body 1.
are fixed by means such as welding, and the base 12 and sub-leader 8 are slidable relative to each other. This sub-reader 8 is installed in the lower part of the main reader 6.
The sub-leader 8 and the main leader 6 are also slidable relative to each other. As shown in FIG. 8, the sub-leader 8 is suspended from the shock absorber 11 by a wire rope 13, so that it can move up and down along with the case body 1 on the rail portion 6a.

Referring to FIG. 1, arrow A is the direction in which the case body 1 slides along the main leader 6, and arrows B and C are the directions in which the case body 1 is tilted together with the main leader 6.

The case body 1 is provided with bearing mounting seats 1a and 1b, and a cylinder body 14 and a lid body 15 are attached to the mounting seat 1b. These mounting seats 1a, 1
b and inside the cylinder 14, there are radial bearings 16,
17 and thrust bearings 18 and 19, the rotating shaft 4 is held. In addition, 20, 21, and 22 are stoppers, and 4a is a gear meshed by belt transmission from the vibration motor 9 (see FIG. 8).

An eccentric weight body 2 is fixed approximately at the center of the rotating shaft 4, and a lower portion of the eccentric weight body 2 is immersed in lubricating oil 3 stored at the bottom of the case body 1.

Further below the bottom of the case body 1 is an ejection port 2.
A lubricating oil take-out tank 1c is provided with a lubricating oil removal tank 1c having a lubricating oil droplet 3 formed therein, and two drip openings 24 for dripping lubricating oil downward are formed in the upper part of the case body 1. And, the extraction port 23 and the dripping port 24 are
They are communicated through a flow path 25 via a lubricating oil suction pump 5, which will be described next.

A lid body 26 is attached to the bearing mounting seat 1a,
A lubricating oil suction pump 5 is attached to the lid body 26. As the suction pump 5, a so-called trochoid pump is used. The shaft rod 5a of the suction pump 5 is connected to the lid body 26.
is inserted therethrough and fixed to the end 4b of the rotating shaft 4. That is, the suction pump 5 is driven by the rotation of the rotary shaft 4, and is capable of sucking up the lubricating oil 3 from the outlet 23 to the dripping port 24.

A funnel 27 having a shape as shown in FIG.
7 by appropriate means. In other words, the lubricating oil that has been sucked up to the dripping port 24 by the suction pump 5 is dripped from here, and is then poured into the funnel 2.
7, it is supplied to the bearing portions of radial bearings 16, 17 and thrust bearings 18, 19, respectively.

Next, the operation of the vibrohammer of this embodiment configured as described above will be explained.

In order to drive the batter piles, the main leader 6 and the case body 1
However, when the mounting seat 1b is tilted in the direction B, the thrust load of the eccentric weight 2 and the rotating shaft 4 is applied to the mounting seat 1b side. In the case of a normal vibro hammer, only radial bearings 16 and 17 are provided, and there is a risk of these bearings being damaged. However, since the present vibro hammer is provided with thrust bearings 18 and 19, it has a structure that can fully withstand such thrust loads. In other words, the outer ring of bearing 18 and bearing 19, which tend to move diagonally downward to the right due to the thrust load, are pulled toward the mounting seat 1b side.
The inner rings of the main leader 69 are received by stoppers 21 and 22, respectively, to prevent a thrust load from being applied to the radial bearing 17.
When the case body 1 is inclined in the direction C, the inner ring of the bearing 18 and the outer ring of the bearing 19, which tend to move diagonally downward to the left, are received by the stoppers 20, 21, respectively, thereby preventing a thrust load from being applied to the radial bearing 16.

Then, when the vibration motor 9 meshing with the gear 4a is started, the rotating shaft 4 and the eccentric weight rotate, and vibration energy is transmitted to the oblique pile to be driven. At this time, since the case body 1 is tilted, the lubricating oil 3 cannot be sufficiently scraped up by the lower part of the eccentric weight body 2, or it cannot be scraped up at all.

However, the suction pump 5 is driven by the rotation shaft 4, and the lubricating oil 3 in the lubricating oil extraction tank 1c is sucked up from the extraction port 23 through the flow path 25 to the dripping port 24. From here, the lubricating oil 3 is dripped into a funnel 27 and supplied to the bearing portions of the radial bearings 16, 17 and the thrust bearings 18, 19.
Therefore, even if the lubricating oil 3 is not scraped up at all by the lower part of the eccentric weight body 2, smooth rotation of the rotating shaft 4 can be maintained.

At this time, as described above, the suction pump 5
Since only a small one is sufficient, the load on the rotating shaft 4 does not increase significantly, and the capacity of the vibrohammer does not decrease. In addition, the space is small compared to the overall size of the vibrohammer, so there is almost no problem.

Although the lubricating oil dripping from the dripping port 24 does not necessarily fall at a constant point due to vibration, it is reliably collected by the funnel 27 and supplied to the bearing section. In order to ensure more reliable collection at this time, it is also possible to make modifications such as increasing the area of the receiving opening of the funnel 27.

Furthermore, as is clear from FIG. 2, the vibration of the case body 1 is transmitted to the main leader via the sub-leader 8 suspended from the wire rope 13. Therefore, this vibration is greatly attenuated, and damage to the main leader 6 due to vibration, friction, etc. is prevented.

The basic embodiment of the present invention is generally as explained above, but next, FIG. , will be briefly explained based on FIG.

In FIG. 5, a roller 28 is attached to the tip of the base 12', and the action of the roller 28 allows the base 12' and the sub-leader 8 to slide freely. In the case of FIG. 2, the contact between the pedestal 12 and the sub-leader 8 is a sliding friction, but in this case it is a rolling friction, so that the wear and noise of the contact portion are reduced accordingly.

Figure 6 shows the roller 28 being rotated 90° from the state shown in Figure 5.
It is rotated and attached to the pedestal 12'', and the part that the roller 28 of the sub-leader 8 comes into contact with has a V-shaped groove in cross section.By making the groove V-shaped in this way, it is possible to This means that it is possible to effectively deal with vibrations in any of the directions (perpendicular to the plane of the paper), lateral (horizontal direction in Figure 6), and vertical direction (vertical direction in Figure 6). If vibrations in each direction occur independently, a V-shaped groove will not have any particular effect.However, during pile driving, vertical vibrations occur simultaneously with horizontal and vertical vibrations. Since the roller 28 and the V-shaped groove are in point contact, it is possible to cope with vibrations in either direction.

By the way, in the basic embodiment shown in FIG. 1, thrust bearings 18 and 19 are used. However, by changing the mounting direction of the case body 1 with respect to the main leader 6, the thrust bearing 18,
19 can be omitted and the structure can be further simplified.

That is, if the case body 1 shown in Fig. 2 is rotated 90 degrees and installed as shown in Fig. 4,
No thrust load is generated when driving diagonal piles. Therefore, the thrust bearings 18, 19
There is no need to use .

However, in this case, the distance from the main leader 6 to the tip of the case body 1, or the distance L from the main leader 6 to the center of gravity position G of the case body 1, becomes larger than in the case shown in FIG. Therefore, the main leader 6
The moment applied to the vibration increases accordingly, which is a negative factor in terms of the vibrohammer's ability. Therefore, in this way, thrust bearing 1
A structure in which 8 and 19 are omitted would be limited to cases where the penetration resistance of the pile is small, for example, when the pile is driven into soft ground.

(Effects of the invention) As is clear from the above, according to the invention, the impact transmitted from the eccentric weight case body to the main leader is alleviated by the sub-leader.
The material containing the primary leader is no longer damaged;
Further, since lubricating oil can be stably supplied to the bearing regardless of the inclination of the case body, the bearing will not be burnt out. Furthermore, even if a thrust load is generated due to the inclination of the case body, the thrust bearing effectively absorbs the thrust load, preventing damage to the bearing and its support.Moreover, the sub-leader and case body can be attached to the shock absorber. Since they are supported, the connection structure between the two is extremely simple.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the main structure of a vibrohammer according to an embodiment of the present invention, Fig. 2 is a cross-sectional view thereof, Fig. 3 is a perspective view of the members used in Fig. 1, and Fig. 4 6 to 6 are vertical cross-sectional views showing other embodiments of the present invention, FIG. 7 is a schematic diagram showing the entire oblique pile driving device to which the vibro hammer of FIG. 1 is attached, and FIG. Part 9 is an enlarged diagram of
1 and 10 are explanatory diagrams for explaining the operation of the present invention, and FIGS. 11 and 12 are explanatory diagrams for explaining the problems of the prior art. 1... Case body, 2... Eccentric weight body, 3... Lubricating oil, 4... Rotating shaft, 5... Lubricating oil suction pump, 6... Main leader, 8... Sub-leader, 16,
17... Radial bearing (bearing member), 18, 19
... Thrust bearing (bearing member), 24 ... Dripping port,
27... Funnel.

Claims (1)

[Scope of utility model registration request] A sub-leader for vibration damping is attached to the main leader so as to be slidable in the diagonal pile driving direction; The eccentric weight case body to be held is supported by shock absorbers suspended from wire ropes, and the eccentric weight case body has a lubricating oil dripping port opened at a position above the bearings; It is attached to the end of the rotating shaft of the eccentric weight body, is driven by the rotation of the rotating shaft, and is capable of pumping up lubricating oil stored at the bottom of the case body for the eccentric weight body to the lubricating oil dripping port. A vibro hammer for driving tilted piles, comprising: a pump for pumping up lubricating oil; and a funnel member for supplying lubricating oil dripping from the lubricating oil dripping port to the bearing member.