JPS6136576Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a pile driving device, and in particular, a weight lifting device that has an adsorption force for a weight and a mechanism for its disappearance from a lifting device installed at the upper end of a cylinder placed on a pile or a pile cap. To make the structure of a pile driving device simple and lightweight by vertically suspending the upper body, to facilitate handling and to perform safe and efficient pile driving work with simple operation.

Conventionally, devices that utilize the striking force of a weight have been widely used as foundation pile driving devices in foundation work for structures or various civil engineering works. With a device in which a wire rope is attached to the wire rope and the weight is hoisted by a winch, the winch is rotated freely and the weight falls naturally, but it is difficult to maintain the lifting height of the weight at a constant level. As a result, the striking force becomes uneven and the wire rope becomes irregularly entangled when the weight falls, resulting in severe wear and damage to the wire rope, which not only poses a danger when cutting, but also causes damage to the wire rope. There is a drawback that a high level of skill is required for the unwinding operation, and as a device to improve this drawback, a case equipped with a weight lifting member such as a hook or a clamp is attached to the wire rope, and the case is lifted by the lifting member. Various devices have also been proposed in which a weight is dropped via a link mechanism or a hydraulic mechanism (for example, Japanese Patent Publication No. 47-34444, Japanese Patent Publication No. 49-1986).
No. 48209, Special Publication No. 1984-36773, Special Publication No. 1983-31413
(Refer to each publication). However, although these devices eliminate the disadvantages of devices that attach wire ropes directly to the weight, they also have the disadvantage of complicating the operating mechanism of the weight lifting member, and they also have problems with driving large diameter piles. When applied to installation equipment, the weight of the weight becomes extremely heavy, which not only increases the overall size and weight of the equipment, but also poses a risk of damaging the lifting members, making the work dangerous. There is a drawback.

In addition, as mentioned above, the equipment that attaches the wire rope to the weight or the case of the lifting member requires a winch as well as a piling tower for pulling the wire rope as hoisting equipment, and the handling of these during transportation and installation is difficult. Not only does it require a lot of labor, but
The disadvantage is that the equipment costs are high.

Therefore, as a device that does not use such hoisting equipment, a weight is suspended by a wire rope hooked in multiple stages through a sheave to the piston rod of a hydraulic cylinder, and after the hydraulic cylinder is operated to lift the weight, There is also a known device in which the hydraulic cylinder is operated in reverse to cause the weight to fall; however, in this device, the falling energy of the weight is absorbed by the piping resistance and the frictional resistance within the hydraulic cylinder, and the energy is reduced. Therefore, there is a drawback that effective impact energy cannot be obtained.

This invention was made to eliminate the above-mentioned drawbacks, and the purpose of this invention is to provide a pile driving device that has an extremely simple, small and lightweight structure and is easy to handle. In addition, the purpose of this invention is to provide a pile driving device that can obtain a stable and uniform striking force.Furthermore, the purpose of this invention is to provide a pile driving device that does not require skill to operate and is highly safe. The purpose of this invention is to provide a pile driving device that can perform efficient work, and a further object of this invention is to reduce the equipment cost of the pile driving device.

That is, this invention, as in the illustrated embodiment, includes a weight 40 housed inside a cylindrical body 12 placed on a pile 11 or a pile head on the same center line as the pile 11; A pile driving system consisting of a weight lifting body 26 equipped with a mechanism for generating and dissipating an adsorption force against the pile, and a lifting device 14 that suspends the weight lifting body 26 from the upper end of the pile 11 or the cylinder 12 so as to be able to rise and fall freely. related to installation equipment.

Examples of this invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment in which the device 10 of this invention is installed on a pile cap. The pile cap of the steel pipe pile 11 is covered with a crown plate 16 to which a hydraulic cylinder 14 is fixed. The hydraulic cylinder 14 has its rod side fixed to the central position of the crown plate 16, and the piston rod 15 is inserted into the central opening of the crown plate 16, so that the piston rod 15 expands and contracts inside the steel pipe pile 11 on the same center line. I'll do what I do. Reference numeral 18 indicates the hydraulic cylinder 1
A hydraulic pump 4 supplies hydraulic oil, and 20 is a pipe connecting the hydraulic pump 18 and the hydraulic cylinder 14.

One end of a connecting rod 22 is connected to the tip of the piston rod 15 of the hydraulic cylinder 14.
A wire rope 24 is hung on the hook 23 at the other end of 2, and the weight lifting body 26 is hung by the wire rope 24.
hang vertically. An electromagnet is attached to the bottom of the weight hoisting body 26 and is connected to a power supply (none of which is shown). When current is passed from the power supply, an attractive force is generated due to magnetic action, and when the power is turned off, an electromagnet is connected to the power supply. The suction power disappears immediately.

The steel pipe pile 11 equipped with the above-mentioned pile driving device has the following features:
A impact receiving seat 30 is fixedly provided on the inner circumferential surface of the impact receiving seat 30. The upper surface of the impact receiving seat 30 is covered with a cushion material 31, and a reinforcing material 32 is attached to the lower surface. Impact receiver 30
An appropriate mounting position is selected in consideration of the falling height of the weight 40 housed inside the steel pipe pile 11, the height of the weight 40 itself, and the maximum stroke length of the piston rod 15 of the hydraulic cylinder 14.

When using the pile driving device having the above configuration, the weight 40 is placed inside the steel pipe pile 11 and the impact seat 30 is placed therebetween.
The pile driving device 10 is placed on the weight lifting body 2.
6 is suspended from the connecting rod 22 at the tip of the piston rod 15 of the hydraulic cylinder 14, and the crown plate 16
is attached to the pile head of the steel pipe pile 11.

Next, to start the pile driving work, the hydraulic cylinder 14 is operated to extend the piston rod 15, and the weight hoisting body 26 is lowered to a position where its bottom surface contacts the weight 40, and then the Weight lifting body 26
When a current is passed through the electromagnet, an attractive force is generated due to magnetic action, and the weight 40 is attracted to the weight. When this state is maintained and the piston rod 15 of the hydraulic cylinder 14 is contracted, the weight 40 rises together with the weight lifting body 26. When the weight 40 is lifted to a predetermined fall height, if the power to the electromagnet of the weight lifting body 26 is cut off, the attractive force disappears and the weight 40 is lifted from the weight lifting body 26. It separates and falls onto the impact receiving seat 30.

By repeatedly performing the above operations,
Driving steel pipe piles 11.

Figure 2 shows another embodiment of this invention;
The device shown in the figure is configured integrally with the cylinder 12, and the cylinder 12
is placed on the top of the pile.

A crown plate 16 of the hydraulic cylinder 14 is attached to the upper end of the cylinder body 12.
The rest of the structure is the same as that of the embodiment shown in FIG. 1, except for the fact that it is fixed, so the same parts are denoted by the same reference numerals and detailed explanation will be omitted.

The steel pipe pile 11 shown in FIG. 2 is provided with a impact seat 30 on the pile head, and the mounting position of the impact seat 30 depends on the length of the cylinder 12 and the maximum stroke length of the piston rod 15 of the hydraulic cylinder 14. can be selected as appropriate.

In the above embodiment, a case has been described in which the weight lifting body incorporates an electromagnet, but the weight lifting body does not necessarily need to be configured as an electromagnet, and may be configured to include a vacuum suction cup. In this case, it is also possible to connect a vacuum pump to the vacuum suction cup and operate the vacuum pump to generate a suction force due to the vacuum effect, and to dissipate the suction force at the same time as the operation of the vacuum pump is stopped.

Further, the lifting device for the weight lifting body may be a pneumatic cylinder instead of the hydraulic cylinder, or a wire rope may be used as necessary.

As explained above, in this invention, a weight lifting body having an adsorption force and its dissipation mechanism is vertically suspended from the upper end of a cylindrical body placed on a pile or a pile cap so that it can be raised and lowered freely via a lifting device. The structure is such that the weight housed inside the pile or cylinder is sucked and lifted at the lowered position of the weight lifting body, and the weight is detached and dropped at the raised position of the weight lifting body. . Therefore, according to this invention, the structure of the pile driving device is extremely simple, and the entire device is small and lightweight, which reduces the labor involved in transporting and installing the device.
Easy to handle. Also, according to this idea,
Since the operation of the lifting device for the weight lifting body, the generation of the adsorption force of the weight lifting body, and the operation of the dissipation mechanism can be automatically operated in conjunction with each other, it is possible to automatically operate the weight lifting device using a wire rope. Winding and rewinding operations do not require a high degree of skill. In addition, the weight lifting body of this invention is equipped with a suction mechanism different from the hook and clamp mechanism, and the lifting capacity can be easily adjusted by setting the suction force to a predetermined strength. Even when applied as a large-diameter pile driving device that uses a heavy weight, there is no risk of damage and pile driving can be performed safely and efficiently. Furthermore, the device of this invention not only eliminates the need for a pile driving tower required for wire rope hoisting equipment, but also eliminates the need for a large-sized device even in the case of a large diameter pile driving device. , equipment costs are significantly lower. Furthermore, by using a fluid pressure cylinder as the elevating device of this invention, the falling height of the weight can be set arbitrarily by the stroke of the piston rod, so a more stable and uniform striking force can be obtained. .

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, and Fig. 2 is a side view showing another embodiment of the present invention. In the drawings, 10 is a pile driving device, 11 is a pile, 12 is a cylindrical body, 14 is a hydraulic cylinder, 26 is a weight lifting body, 4
0 is a plumb bob.

Claims (1)

[Claims for Utility Model Registration] (1) A weight housed inside a cylindrical body placed on a pile or a pile head on the same center line as the pile, and a mechanism for generating and dissipating an adsorption force for the weight. A pile driving device comprising: a weight lifting body, and a lifting device that vertically suspends the weight lifting body from the upper end of the pile or cylindrical body so as to be vertically movable up and down. (2) The pile driving device according to claim 1, wherein the lifting device is a hydraulic cylinder. (3) The pile driving device according to claim 1 or 2 of the utility model registration claim, which comprises an electromagnet at the bottom of the weight lifting body. (4) The pile driving device according to any one of claims 1 to 3, which is equipped with a vacuum suction cup at the bottom of the weight lifting body.