JPH027941Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hydraulic drop hammer that drives a pile by raising and dropping a weight using a hydraulic cylinder.

[Prior art]

In recent years, hydraulic drop hammers with a soundproof structure that generate less noise, vibration, and air pollution have been put into practical use.

This hydraulic drop hammer is equipped with various soundproofing devices to minimize the impact noise generated when the weight drives the pile. A closed casing 4 is fitted over the casing 3 in which the weight 2 suspended by the casing 1 is enclosed, and the bottom cover 5 of the closed casing 4 is constructed to be able to be opened and closed by a cylinder 6. The bottom cover 5 of the sealed casing 4 is closed by fitting the stake 7 into the cap 8 fixed to the lower part of the casing 3, and the casing 3 is closed.
A weight 2 is lifted by a hydraulic cylinder 1 provided at the top, and is dropped to strike a pile 7 through a cushioning material (wood) 9 fixed to the bottom of the casing 3.

For this reason, it not only has a complicated structure, but also has the drawbacks of being heavy and complicated to operate, and an improvement has been desired.

[Purpose of invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a hydraulic drop hammer equipped with a soundproofing device that is simple in structure, lightweight, and easy to operate.

[Structure of the idea]

In order to achieve the above objectives, this invention has a weight suspended by a hydraulic cylinder inside a sealed casing, a cylindrical guide for guiding the head of the pile at the bottom, and urethane rubber at the top. A lower casing containing a cap with a cushioning material sandwiched from above and below by wood is fixed to the lower end of the casing, and a soundproof seal is provided in the gap between the lower cover of the lower casing and the cylindrical guide. It is said that

〔Example〕

An embodiment of the present invention will be described based on FIGS. 2 and 3.

A hydraulic drop hammer is installed in a hammer guide arranged on a turret installed on the main body of the pile driver so as to be able to slide up and down.

The hydraulic drop hammer 10 according to the present invention has a weight 12 suspended in a closed vertical cylindrical casing 11 by a hydraulic cylinder 13 provided on the upper part of the casing 11, and is transferred from a hydraulic device 14 to the hydraulic cylinder 13 via a switching valve. The weight 12 is raised and lowered by supplying and discharging pressure oil. Note that 11a is a guide fitting that engages with the hammer guide.

An upper casing 17 is fixedly installed above the casing 11 to cover a hydraulic cylinder 13, a valve unit 15, an accumulator 16, etc., and the valve unit 15 supplies pressure oil from the hydraulic device 14 to the hydraulic cylinder 1.
In addition to the solenoid valve (switching valve) that switches between the rod side chamber and the head side chamber 3, valves that send pressure oil from the rod side chamber and pressure oil from the accumulator 16 to the head side chamber when the weight falls are compactly housed.

In addition, an appropriate number of proximity switches 19 are provided on the inner wall of the casing 11 in order to adjust the impact force on the pile 18 depending on the ground condition, etc.
The ascending position of the weight 12 is automatically controlled by a command from.

The weight 12 is guided by the inner wall of the casing 11 and falls, but the hydraulic cylinder 13 is mounted on a spherical bearing 2 so as not to apply bending stress to the cylinder rod 13a.
1. A cylindrical lower casing 22 is fixed to the lower part of the casing 11,
A cap 23 is installed inside.

At the top of the cap 23, a cushioning material 24 is provided, in which a urethane rubber 24b is sandwiched between upper and lower sides of wood 24a, in order to absorb the impact sound when the weight 12 falls and hits, and at the bottom of the cap 23, a cylinder is provided that guides and engages the stake 18. A shaped guide 23a is removably fixed with a bolt (not shown). A cushioning material (wood) 25 is fixed to the surface of the stake 18 that comes into contact with the head.

The lower cover 22c of the lower casing 22 is configured to be removable with bolts, and is attached to the guide 23 of the cap 23.
Soundproof seals 26 and 27 are provided to close the gap with a. Moreover, cushioning material (rubber) 22d is fixed to the upper and lower ends of the lower casing 22 to prevent noise when the cap 23 comes into contact with the cap 23.

Further, a fall prevention device 28 for the cap 23 is attached to the side wall portion of the lower casing 22.

This device is used for guide 2 when driving piles with different diameters.
This is to prevent the cap 23 from falling when replacing the lower cover 22c of the lower casing 22 and the lower cover 22c with one that matches the diameter of the pile. Kara pin 2
When the pin 8a is attached, the tip of the pin 28a protrudes into the casing 22, and the lower end of the cap 23 is locked thereto.

With this structure, when the hydraulic cylinder 13 is operated, the weight 12 hits the pile 18 through the buffer material 24 and the buffer material 25 of the cap 23, but the buffer material 24 moves the urethane rubber 24b to the wood 24.
Since it is configured in a sanderch-like shape at a, the impact sound is reduced, and furthermore, this impact sound is blocked from being released into the outside air by the soundproof seals 26 and 27 provided at the bottom of the lower casing 22, so that the pile impact noise is reduced. becomes extremely small.

[Effect of idea]

As mentioned above, the present invention has a weight suspended by a hydraulic cylinder inside a sealed casing, a cylindrical guide for guiding the head of the pile at the bottom, and a urethane rubber on the top with wood. A lower casing containing a cap with cushioning material sandwiched between them is fixed to the lower end of the casing, and a soundproof seal is provided in the gap between the lower cover of the lower casing and the cylindrical guide, making it lightweight and lightweight. It is easy to operate, has excellent soundproofing effects, and has great practical effects.

[Brief explanation of drawings]

Figure 1 is an overall view of a conventional hydraulic drop hammer.
FIG. 2 is an explanatory view showing the whole hydraulic drop hammer according to the present invention, and FIG. 3 is a detailed view of the main parts. 10 is a hydraulic drop hammer, 11 is a casing, 11a is a guide fitting, 12 is a weight, 13 is a hydraulic cylinder, 14 is a hydraulic system, 15 is a valve unit, 16 is an accumulator, 17 is an upper casing, 18 is a pile, 19 is a nearby switch, 20 is a control device, 21 is a spherical bearing, 22 is a lower casing,
22c is the lower lid, 23 is the cap, 23a is the guide,
24 is a cushioning material, 24a is wood, 24b is urethane rubber, 25 is a cushioning material, 26 and 27 are soundproof seals,
28 is a fall prevention device.

Claims (1)

[Scope of utility model registration request] A weight suspended by a hydraulic cylinder is installed inside a sealed casing, a cylindrical guide is provided at the bottom to guide the head of the pile, and a cushioning material made of urethane rubber sandwiched between top and bottom pieces of wood is provided at the top. A hydraulic drop hammer characterized in that a lower casing containing a cap is fixed to the lower end of the casing, and a soundproof seal is provided in the gap between the lower cover of the lower casing and the cylindrical guide.