JP5785048B2 - Hydraulic hammer silencer - Google Patents

Description

  The present invention relates to a silencer for a hydraulic hammer, and more particularly, to a compact silencer for a hydraulic hammer that can significantly reduce noise generated when the hydraulic hammer drives a pile.

  When a pile is driven with a hydraulic hammer, a driving noise is generated. Various silencers that reduce this noise have been proposed (see, for example, Patent Document 1). The silencer proposed in Patent Document 1 has a cylindrical soundproof wall portion disposed with a gap on the outer peripheral side of the hammer body. An annular soundproof seal is provided at the lower end of the cylindrical soundproof wall, and the substantially lower half of the hammer body and the pile head are hermetically covered by the silencer. That is, a gap between the pile and the cylindrical soundproof wall is a sealed air passage.

  Therefore, in this silencer, since the driving sound is trapped in the sealed air passage, it is possible to suppress the noise as compared with the case where the driving sound is directly transmitted to the outside. However, since the sound trapped in the sealed air passage is transmitted to the outside through the cylindrical soundproof wall, there is room for improvement in order to greatly reduce the noise.

  The pile driving sound is emitted from various positions, but the present inventors have clarified that the largest noise source is the lower end opening of the sleeve of the hydraulic hammer. Therefore, in order to greatly reduce the noise, it is important to reduce the driving sound emitted from this position.

JP-A-56-81720

  An object of the present invention is to provide a compact silencer for a hydraulic hammer that can significantly reduce noise generated when the hydraulic hammer drives a pile.

In order to achieve the above object, a silencer for a hydraulic hammer according to the present invention includes a cylindrical cover body having openings at both ends that are disposed on the outer peripheral side of a sleeve of the hydraulic hammer, and the sleeve at the lower end of the cover body. An annular elastic member that protrudes and is attached to the inner peripheral side, and a sound absorbing material that is disposed between the gaps, and when the cover body is disposed on the outer peripheral side of the sleeve, the gap is an upper end opening of the cover body. through an external communication with the cover body, the upper position of the cover body so as to cover the gap, wherein the upper cover portion which is arranged at a top and gap of the cover member is provided.
Another silencer for a hydraulic hammer according to the present invention includes a cylindrical cover body having openings at both ends that are disposed on the outer peripheral side of a sleeve of the hydraulic hammer, and an inner periphery of the lower end portion of the cover body. An annular elastic member that protrudes to the side and a sound absorbing material that is disposed between the gaps, and when the cover body is disposed on the outer peripheral side of the sleeve, the gap is formed through the upper end opening of the cover body. The cover body is suspended from an anvil installed on the sleeve in communication with the outside.
Another silencer for a hydraulic hammer according to the present invention includes a cylindrical cover body having openings at both ends that are disposed on the outer peripheral side of a sleeve of the hydraulic hammer, and an inner periphery of the lower end portion of the cover body. An annular elastic member that protrudes to the side and a sound absorbing material that is disposed between the gaps, and when the cover body is disposed on the outer peripheral side of the sleeve, the gap is formed through the upper end opening of the cover body. The cover body is fixed to the outer peripheral surface of the sleeve in communication with the outside.
Another silencer for a hydraulic hammer according to the present invention includes a cylindrical cover body having openings at both ends that are disposed on the outer peripheral side of a sleeve of the hydraulic hammer, and an inner periphery of the lower end portion of the cover body. An annular elastic member that protrudes to the side and a sound absorbing material that is disposed between the gaps, and when the cover body is disposed on the outer peripheral side of the sleeve, the gap is formed through the upper end opening of the cover body. The sound absorbing material that communicates with the outside and is disposed at the lower end portion of the cover body has a density set higher than that of the sound absorbing material disposed at the upper end portion.
Another silencer for a hydraulic hammer according to the present invention includes a cylindrical cover body having openings at both ends that are disposed on the outer peripheral side of a sleeve of the hydraulic hammer, and an inner periphery of the lower end portion of the cover body. An annular elastic member that protrudes to the side and a sound absorbing material that is disposed between the gaps, and when the cover body is disposed on the outer peripheral side of the sleeve, the gap is formed through the upper end opening of the cover body. A sound-absorbing material is disposed on the upper surface of the elastic member in communication with the outside.

Here, in each of the other silencers of the hydraulic hammer of the present invention described above, an upper end cover portion disposed at a position above the cover body so as to cover the gap so as to cover the gap. Ru can be the specifications provided.

  According to the silencer of the present invention, a cylindrical cover body having openings at both ends arranged with a gap on the outer peripheral side of the sleeve of the hydraulic hammer, and a lower end portion of the cover body that protrudes to the inner peripheral side from the sleeve. When the pile is driven with a hydraulic hammer to which the silencer is attached, the sleeve is arranged at the lower end opening of the sleeve. It becomes possible to cover the gap with the pile with an annular elastic member. Therefore, the driving sound emitted from the lower end opening of the sleeve is reflected by the elastic member, and leakage to the outside is suppressed, and leakage to the outside is also suppressed by the cover body. In addition, a compact configuration can be achieved, and handling, movement, storage, and the like are facilitated, which is advantageous for cost reduction.

  When the cover body is arranged on the outer peripheral side of the sleeve, the gap between the outer peripheral surface of the sleeve and the cover body communicates with the outside of the cover body through the upper end opening of the cover body. The sound enters the gap toward the upper end opening of the cover body, and does not stay in this gap. The approaching sound that has entered is attenuated by the sound-absorbing material disposed in the gap in the process, so that it is possible to greatly reduce the noise that is a noise even though the structure is compact.

It is a front view which illustrates an embodiment of a silencer of a hydraulic hammer of the present invention. It is a longitudinal cross-sectional view of the silencer of FIG. It is a cross-sectional view of the silencer of FIG. It is a longitudinal cross-sectional view which illustrates another embodiment of a silencer. It is a longitudinal cross-sectional view which illustrates embodiment which attached the outer side cover member to the silencer of FIG.

  Hereinafter, a silencer for a hydraulic hammer according to the present invention will be described based on an embodiment shown in the drawings.

  As illustrated in FIGS. 1 to 3, the silencer 1 of the present invention is used by being attached to a hydraulic hammer 10. The hydraulic hammer 10 is provided with an anvil 11 at a lower end portion of a hammer main body 10 a provided with a ram, and a cylindrical sleeve 12 is extended downward from the anvil 11. A lower end of the sleeve 12 is opened, and a protruding portion 13 for guiding a pile 14 to be placed is provided on the inner peripheral surface thereof with an interval in the circumferential direction. In some cases, the inner peripheral surface of the sleeve 12 does not have the protrusion 13.

  The hydraulic hammer 10 is hung by a crane wire and installed with the sleeve 12 fitted on the head of the pile 14. In this state, the pile 14 is driven by dropping a ram provided in the hammer body 10 a onto the anvil 11 and hitting the head of the pile 14 via the anvil 11.

  The silencer 1 includes a cylindrical cover body 2 having openings at both ends, an annular elastic member 3 attached to a lower end portion of the cover body 2, and a sound absorbing material 4 disposed inside the cover body 2. The cover body 2 is arranged with a gap S on the outer peripheral side of the sleeve 12 of the hydraulic hammer 10. The elastic member 3 is attached so as to protrude inward from the sleeve 12. The sound absorbing material 4 is disposed in the gap S. When the cover body 2 is disposed on the outer peripheral side of the sleeve 12, the gap S communicates with the outside of the cover body 2 through the upper end opening 2 a of the cover body 2.

  A mounting portion 2 c projects from the outer peripheral surface of the cover body 2, and a mounting portion 11 a projects from the upper surface of the anvil 11. And the shackles 8a and 8a connected to the attachment parts 2c and 11a which oppose up and down are connected by the attachment wire 7 and the turnbuckle 8b. As described above, the cover body 2 is suspended from the anvil 11 installed on the sleeve 12 and arranged on the outer peripheral side of the sleeve 12. In order to prevent the silencer 1 from being accidentally dropped, a fall prevention wire 9 is connected to the shackles 8a and 8a facing vertically.

  The attachment portion 11a is not limited to the upper surface of the anvil 11, and can be provided at other positions. For example, the attachment part 11a can also be provided on the hammer body 10a.

  According to the silencer 1 suspended in this manner, the existing hydraulic hammer 10 can be easily attached and detached. Accordingly, the silencer 1 can be attached to the hydraulic hammer 10 only when necessary, and can be removed and used when not required.

  The cover body 2 is made of general carbon steel or the like and is preferably cylindrical like the sleeve 12. The wall thickness of the cover body 2 is, for example, about 12 mm to 25 mm.

  As the elastic member 3, rubber, soft resin, or the like can be used. The elastic member 3 is installed such that its inner peripheral surface 3a slightly contacts the outer peripheral surface 14a of the pile 14 to be placed, or has an interval of about 0 to 20 mm from the outer peripheral surface 14a. That is, the elastic member 3 is installed so as to close the lower end opening 2 b of the cover body 2. In consideration of suppression of driving noise and wear of the elastic member 3, the elastic member 3 is more preferably installed such that the inner peripheral surface 3a has an interval of 0 to 10 mm from the outer peripheral surface 14a.

  The gap S between the outer peripheral surface of the sleeve 12 and the inner peripheral surface of the cover body 2 is, for example, about 50 mm to 250 mm. The sound absorbing material 4 is arranged so as to fill the entire range of the gap S.

As the sound absorbing material 4, for example, a foam such as glass wool, foam rubber, or foam resin can be used. For glass wool, for example, the density of ^{20kg / m 3 ~120kg / m 3} .

In this embodiment, an annular upper end cover portion 5 is provided at a position above the cover body 2 so as to cover the gap S so as to open the upper end of the cover body 2 and the gap S1. If without the upper cover part 5, which may sound absorbing material 4 is wetted by rain or the like enters the gap S through the upper end opening 2a of the cover 2. When the sound absorbing material 4 gets wet, there arises a problem that the performance of attenuating the placement sound deteriorates. On the other hand, when the upper end cover portion 5 is provided, such a problem can be prevented. In order to more reliably prevent rain and the like from entering the gap S, the upper end cover portion 5 is preferably protruded to the outer peripheral side of the cover body 2 and is an annular body inclined downward toward the outer peripheral side.

  As described above, the silencer 1 of the present invention is compact because it can be sized to cover the sleeve 12 of the hydraulic hammer 10. Accordingly, the silencer 1 can be easily handled, moved, stored, and the like. It is also advantageous to reduce the manufacturing cost of the silencer 1.

  When the silencer 1 according to the present invention is used, the sound that is emitted from the lower end opening 12a of the sleeve 12 that is the largest noise source is reflected by the elastic member 3 while having a compact configuration. Thereby, the setting sound which leaks from the lower end opening 12a to the outside of the silencer 1 is suppressed.

The reflected driving sound enters the gap S toward the upper end opening 2 a of the cover body 2. Since the driving sound that has entered is attenuated by the sound absorbing material 4 disposed in the clearance S in the process, it is possible to significantly reduce the driving sound that becomes noise. The clearance S between the outer peripheral surface and the cover body 2 of the sleeve 12, so that by communication with the exterior of the cover member 2 through the upper end opening 2a of the cover 2, Susumu off to hit設音becomes not Komora the clearance S ing.

  For example, by using the silencer 1 of the present invention, the noise level of the driving sound when driving a pile with a hydraulic hammer having a ram weight of 10 tons can be evaluated with an all-pass evaluation of a frequency range of 31.5 Hz to 8 kHz. It becomes possible to reduce 6 dB or more.

  The sound absorbing material 4 can have the same specifications at all positions, but the density can be varied depending on the position where the sound absorbing material 4 is arranged. When placing the pile 14, since the placing sound emitted from the gap S in the lower end opening 2 b of the cover body 2 becomes the largest noise source, for example, the sound absorbing material 4 disposed at the lower end portion of the cover body 2. Is made larger than the density of the sound absorbing material 4 disposed at the upper end. If it is within the general range, the higher the density of the sound absorbing material 4, the greater the effect of attenuating the placement sound. Therefore, if the density of the sound absorbing material 4 near the noise source is higher, the noise is suppressed. Is advantageous. Alternatively, the density of the sound absorbing material 4 may be gradually increased in the order of the sound absorbing material 4 disposed at the upper end portion of the cover body 2, the sound absorbing material 4 disposed at the center portion, and the sound absorbing material 4 disposed at the lower end portion. it can.

  If necessary, the sound absorbing material 4 a can be disposed on the upper surface of the elastic member 3. Thereby, it becomes more advantageous to suppress the driving sound leaking outside the cover body 2 through the elastic member 3. The sound absorbing material 4a is preferably arranged with a gap so as not to contact the outer peripheral surface 14a of the pile 14.

  In the case of the specification in which the cover body 2 is suspended from the anvil 11, since the silencer 1 and the pile 14 are not integrated, the marking at the time of surveying for confirming the position of the pile 14 placed on the silencer 1 is performed. Cannot be attached. Therefore, in order to reduce the range where marking cannot be performed, it is desirable to reduce the length of the silencer 1 (cover body 2) in the cylinder axis direction. On the other hand, in order to improve the noise reduction effect, a certain length in the cylinder axis direction is necessary to ensure the length of the gap S. Therefore, it is preferable that the length of the cover body 2 in the cylinder axis direction is about 1.0 m to 2.5 m.

  In the embodiment of the silencer 1 illustrated in FIG. 4, the cover body 2 is fixed to the outer peripheral surface of the sleeve 12. Specifically, a spacer 6 is protruded from the inner peripheral surface of the cover body 2 at a circumferential interval, and the spacer 6 is welded to the outer peripheral surface of the sleeve 12. The cover body 2 can also be fixed to the sleeve 12 using a fastening member such as a bolt.

  A sound absorbing material 4 is filled in a gap S between the outer peripheral surface of the sleeve 12 and the cover body 2, and an annular elastic member 3 is attached to the lower end portion of the cover body 2 so as to protrude from the sleeve 12 toward the inner peripheral side. . Further, when the cover body 2 is disposed on the outer peripheral side of the sleeve 12, the gap S communicates with the outside of the cover body 2 through the upper end opening 2 a of the cover body 2. This embodiment has the same structure as the previous embodiment except that the means for arranging the cover body 2 on the outer peripheral side of the sleeve 12 is different. If the cover body 2 is designed to be fixed integrally with the sleeve 12 in this way, it is possible to attach markings to the cover body 2 during surveying for confirming the position of the pile 14 placed. There is. Accordingly, the length of the cover body 2 in the cylinder axis direction can be freely set.

  As illustrated in FIG. 5, an outer cover member 15 that covers the anvil 11, the upper end cover portion 5, and the cover body 2 and that has an open lower end can be provided. The outer cover member 15 may be formed of a metal such as a general resin sheet, canvas sheet, or general carbon steel. The upper end portion of the outer cover member 15 is fixed to the hydraulic hammer 10 as appropriate. In the model experiment, it was confirmed that by using the silencer 1 to which the outer cover member 15 was attached, the noise level of the placement sound could be reduced by 10 dB or more by an all-pass evaluation of the frequency range of 31.5 Hz to 8 kHz.

DESCRIPTION OF SYMBOLS 1 Silencer 2 Cover body 2a Upper end opening 2b Lower end opening 2c Attaching part 3 Annular elastic member 3a Inner peripheral surface 4 4a Sound absorbing material 5 Upper end cover part 6 Spacer 7 Mounting wire 8a Shackle 8b Turnbuckle 9 Fall prevention wire 10 Hydraulic hammer 10a Hammer body 11 Anvil 11a Mounting portion 12 Sleeve 12a Lower end opening 13 Protruding portion 14 Pile 14a Outer peripheral surface 15 Outer cover member

Claims (6)

A cylindrical cover body with openings at both ends that are arranged with a gap on the outer peripheral side of the sleeve of the hydraulic hammer, and an annular elastic member that is attached to the lower end portion of the cover body so as to protrude to the inner peripheral side from the sleeve; and a sound absorbing material disposed in said gap, upon placing the cover member on the outer peripheral side of the sleeve, the gap is outside communication of the cover body through the upper end opening of the cover member, the upper position of the cover body A silencer for a hydraulic hammer, characterized in that an upper end cover portion is provided so as to cover the gap with an upper end of the cover body being spaced from the upper end . A cylindrical cover body with openings at both ends that are arranged with a gap on the outer peripheral side of the sleeve of the hydraulic hammer, and an annular elastic member that is attached to the lower end portion of the cover body so as to protrude to the inner peripheral side from the sleeve; and a sound absorbing material disposed in said gap, upon placing the cover member on the outer peripheral side of the sleeve, the gap is outside communication of the cover body through the upper end opening of the cover member, the cover member is of the sleeve A silencer for a hydraulic hammer, which is suspended from an anvil installed above . A cylindrical cover body with openings at both ends that are arranged with a gap on the outer peripheral side of the sleeve of the hydraulic hammer, and an annular elastic member that is attached to the lower end portion of the cover body so as to protrude to the inner peripheral side from the sleeve; and a sound absorbing material disposed in said gap, upon placing the cover member on the outer peripheral side of the sleeve, the gap is outside communication of the cover body through the upper end opening of the cover member, the cover member is of the sleeve A silencer for a hydraulic hammer characterized by being fixed to an outer peripheral surface . A cylindrical cover body with openings at both ends that are arranged with a gap on the outer peripheral side of the sleeve of the hydraulic hammer, and an annular elastic member that is attached to the lower end portion of the cover body so as to protrude to the inner peripheral side from the sleeve; and a sound absorbing material disposed in said gap, upon placing the cover member on the outer peripheral side of the sleeve, the gap is outside communication of the cover body through the upper end opening of the cover body, the lower end portion of the cover body A silencer for a hydraulic hammer , wherein the arranged sound absorbing material is set to have a higher density than the sound absorbing material arranged at the upper end . A cylindrical cover body with openings at both ends that are arranged with a gap on the outer peripheral side of the sleeve of the hydraulic hammer, and an annular elastic member that is attached to the lower end portion of the cover body so as to protrude to the inner peripheral side from the sleeve; and a sound absorbing material disposed in said gap, upon placing the cover member on the outer peripheral side of the sleeve, the gap is outside communication of the cover body through the upper end opening of the cover member, the upper surface of the elastic member, A silencer for a hydraulic hammer, characterized in that a sound absorbing material is arranged . The muffler of a hydraulic hammer according to any one of claims 2 to 5 , wherein an upper end cover portion is provided at an upper position of the cover body so as to cover the gap so as to cover the upper end of the cover body. vessel.

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