JP2010180689A - Soundproof device for hydraulic hammer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soundproof device having light and simple construction for achieving sufficient soundproof effects. <P>SOLUTION: A large-diameter cylindrical pipe 34 and a lower cover 36 and an upper cover 38 for blocking both ends thereof constitute a cover which stores at least an anvil 20b and a pile sleeve 20c as engaging portions with a steel pipe pile of a hydraulic hammer 20. The large-diameter cylindrical pipe 34 and the lower cover 36 are closely adhered to each other via a soundproof material without being fixed to each other. They are suspended in use from a crane via suspenders 56, 58, 74 which are provided on each of the lower cover 36 and the upper cover 38 for carrying out slinging work for an auxiliary hoisting wire rope of the crane, together with the hydraulic hammer 20 suspended from a main hoisting wire rope of the crane. During the pile head hammering of the steel pipe pile 18, the rebound of the hydraulic hammer 20 is absorbed by portions where the large-diameter cylindrical pipe 34 and the lower cover 36 are closely adhered to each other via the soundproof material without being fixed to each other, thus attenuating impact on the soundproof device 28. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a soundproofing device for a hydraulic hammer for placing a steel pipe pile.

  Conventionally, a hydraulic hammer has been widely used when placing a steel pipe pile as a support pile of a building on the ground. However, the hydraulic hammer has a very large impact sound when hitting the steel pipe pile head, and when used in places close to schools, hospitals, residential areas, etc., soundproofing measures appropriate for the hydraulic hammer are required. It is indispensable to apply. Therefore, conventionally, as shown in FIG. 11, a soundproofing device 12 is used in the pile driving machine 10. In the pile driving machine 10, a leader 16 is vertically supported by a crawler moving base machine 14, and a hydraulic hammer 20 for placing a steel pipe pile 18 is guided by the leader 16 so as to be movable up and down. The reader 16, the steel pipe pile 18, and the hydraulic hammer 20 are entirely covered with a cover 24 having a double-spread structure supported by the support 22. In addition, the part shown with the code | symbol 26 in FIG. 11 is an exhaust apparatus which ventilates the air inside the cover 24 at the time of the placement of the steel pipe pile 18 (for example, refer nonpatent literature 1).

Published on February 26, 2001, edited by the Japan Construction Mechanization Association Noise and Vibration Countermeasure Handbook Revision Committee, “Noise and Vibration Countermeasure Handbook for Construction (3rd Edition)”, p149

On the other hand, as another example of the pile driving machine, a type in which the hydraulic hammer 20 is suspended by a wire rope of a crane is widely used (see FIG. 10). In this case, the hydraulic hammer 20 is shown in FIG. If the soundproofing device 12 shown is suspended and used, an increase in the size of the crane is unavoidable, resulting in an increase in the operating cost of the hydraulic hammer 20, and in the first place, the crane of the base machine 14 shown in FIG. Since it is not such a dedicated machine, it is difficult to use the soundproofing device 12 of FIG.
The present invention has been made in view of the above problems, and its object is to be used for a hydraulic hammer that is suspended by a wire rope of a crane and exhibiting a sufficient soundproofing effect, An object of the present invention is to provide a soundproofing device that is as light and simple as possible.

(Aspect of the Invention)
The following aspects of the present invention exemplify the configuration of the present invention, and will be described separately for easy understanding of various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the constituent elements of each section are replaced, deleted, or still other configurations in consideration of the mode for carrying out the invention. What added the element can also be included in the technical scope of this invention.

  (1) A soundproofing device for a hydraulic hammer that is used by being hung by a wire rope of a crane, and has a diameter capable of accommodating an engaging portion with a steel pipe pile of the hydraulic hammer, and has a large sound absorbing material in a wall portion. It has a diameter cylindrical tube, a diameter opening that allows a hydraulic hammer or steel pipe pile to be inserted in the center, and a cover composed of a lower cover and an upper cover containing a sound absorbing material in the wall, and a steel pipe pile can be inserted. A small-diameter cylindrical tube having a diameter and projecting a predetermined length from the opening of the lower lid, and the large-diameter cylindrical tube and the lower lid or the upper lid are in close contact with each other without being fixed to each other A soundproofing device for a hydraulic hammer, in which each of the lower lid and the upper lid is provided with a hanging tool for hanging a supplementary wire rope of a crane.

The soundproofing device for a hydraulic hammer described in this section constitutes a cover that accommodates at least an engaging portion with a steel pipe pile of the hydraulic hammer by a large-diameter cylindrical tube and a lower lid and an upper lid that close both ends thereof. The large-diameter cylindrical tube and the lower lid or the upper lid are in close contact with each other through the sound absorbing material without being fixed to each other, and the auxiliary winding wire rope provided on each of the lower lid and the upper lid is slung. Are suspended by the crane together with a hydraulic hammer suspended from the main wire rope of the crane.
When the steel pipe pile is driven by the hydraulic hammer, the hydraulic hammer is covered with a cover, and a portion of the steel pipe pile protruding from the cover is covered with a small-diameter cylindrical pipe protruding a predetermined length from the opening of the lower lid. Then, as the position of the steel hammer pile is lowered by the hydraulic hammer, the hydraulic hammer's soundproofing device also descends while the hydraulic hammer rebounds when hitting the head of the steel pipe pile. Or it absorbs by the part which closely_contact | adhered via the sound-absorbing material, without fixing an upper cover mutually, and attenuates the impact concerning the said soundproofing apparatus. In this way, the impact sound generated when the hydraulic hammer strikes the steel pipe pile head is sound-insulated by the large-diameter cylindrical tube, the lower lid, the upper lid, and the small-diameter cylindrical tube.

(2) The soundproofing device for a hydraulic hammer according to (1), wherein the small diameter cylindrical tube is made of a sound insulating material.
The soundproofing device for a hydraulic hammer described in this section is a small-diameter cylindrical tube made of a sound insulating material that leaks impact sound generated when the hydraulic hammer hits the steel pipe pile head from the opening of the lower lid. The sound insulation is effective.

(3) In the above items (1) and (2), a soundproofing device for a hydraulic hammer including a soundproof sheet wound around a hydraulic hammer protruding from the opening of the upper lid and covering the opening of the upper lid (claim 3).
The soundproofing device for a hydraulic hammer described in this section is used to wrap around a hydraulic hammer protruding from the opening of the upper lid, and to effectively insulate the impact sound leaking from the opening of the upper lid by a soundproof sheet covering the opening of the upper lid. is there.

  Since this invention was comprised in this way, it becomes as light and simple a structure as possible while exhibiting sufficient soundproofing effect as a soundproofing device of the hydraulic hammer used hanging by the wire rope of a crane.

It is a principal part longitudinal cross-sectional view of the soundproofing apparatus of the hydraulic hammer based on embodiment of this invention. It is a cross-sectional view of a large diameter cylindrical tube of the soundproofing device for the hydraulic hammer shown in FIG. It is an internal expansion figure of the large diameter cylindrical tube of the soundproofing apparatus shown by FIG. It is a top view of the lower cover of the soundproofing device of the hydraulic hammer shown in FIG. It is a principal part longitudinal cross-sectional view of the lower cover of the soundproofing apparatus shown by FIG. It is a top view of the upper cover of the soundproofing device of the hydraulic hammer shown in FIG. It is a principal part longitudinal cross-sectional view of the upper cover of the soundproofing apparatus shown by FIG. It is a side view of the hydraulic hammer to which this soundproofing device is applied. It is a figure which shows the state which set the soundproofing device of the hydraulic hammer which concerns on embodiment of this invention to the hydraulic hammer. It is a schematic diagram of a pile driving machine to which a hydraulic hammer is suspended by a wire rope of a crane placed on a trolley, to which a soundproofing device for a hydraulic hammer according to an embodiment of the present invention is applied. It is a schematic diagram of a pile driver provided with the conventional soundproofing device.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. Note that the same or corresponding parts as those of the prior art are denoted by the same reference numerals, and detailed description thereof is omitted.
The soundproofing device 28 of the hydraulic hammer according to the embodiment of the present invention is used when the steel pipe pile 18 is driven from the water surface to the bottom of the water, and is specifically shown in FIGS. 9 and 10. As described above, the hydraulic hammer 20 is applied to a pile driving machine configured by being suspended by a wire rope (main winding wire rope) 32 of a crane 30 placed on a carriage. As shown in FIG. 8, the hydraulic hammer 20 includes a ram 20a, an anvil 20b and a pile sleeve 20c that are fixed to the distal end side of the ram 20a and that constitute an engagement portion with a steel pipe pile, and a proximal end portion of the ram 20a. The hanging tool 20d for hanging the wire rope 32 (FIGS. 9 and 10) is fixed.

Further, as shown in FIG. 1, the hydraulic hammer soundproofing device 28 includes a large-diameter cylindrical tube 34, a lower lid 36, an upper lid 38, and a small-diameter cylindrical tube 40.
The large-diameter cylindrical tube 34 has a diameter and a length that can accommodate the anvil 20b and the pile sleeve 20c of the hydraulic hammer 20. The diameter and the length are appropriately set in accordance with the size of the hydraulic hammer 20 to be used, while ensuring the clearance between the anvil 20b and the pile sleeve 20c of the hydraulic hammer 20 required for placing. . As shown in FIGS. 2 and 3, the large-diameter cylindrical tube 34 is formed in the space formed between the double steel cylindrical tubes 42 and 44 and the inner surface of the inner steel cylindrical tube 42. The sound absorbing materials 46 and 48 are arranged. The sound absorbing material 46 is fixed without dropping off by being packed between the double cylindrical tubes 42 and 44. The sound absorbing material 48 is fixed without dropping by a plurality of CT sections 50 fixed at equal intervals along the central axis of the cylindrical tube 42 and a plurality of transverse beams 52 fixed between the CT sections 50. ing. For the sound absorbing materials 46 and 48, for example, rock wool, wired blanket (rock wool is formed into a blanket shape with a small amount of binder, and turtle shell wire mesh is sewn with iron wire) are used, but other sound absorbing materials should be used. Is also possible (the same applies to each sound absorbing material described below).

  As shown in FIG. 4, the lower lid 36 has an opening 36 a having a diameter through which a hydraulic hammer or a steel pipe pile can be inserted, and as shown in FIG. 5, the lower lid 36 is formed in a hollow steel wall portion. The sound absorbing material 54 is incorporated. Further, in the illustrated example, the lower lid 36 is divided into four parts as indicated by reference numerals 361, 362, 363, and 364, and the connecting members 56, 58, 60, and 62 are fixed by bolts to be surely integrated. It has a structure. In addition, each connection tool 56, 58, 60, 62 is used also as a hanging tool for laying the auxiliary winding wire rope 64 (refer FIG. 10) of the crane 30 suitably. Further, in the illustrated example, the sound absorbing material 66 is fixed to the surface (upper surface) of the lower lid 36 facing the large diameter cylindrical tube 34, and the large diameter cylindrical tube 34 and the lower lid 36 are not fixed to each other. The material 66 is in close contact with each other.

  The small-diameter cylindrical tube 40 is fitted to the opening 36 a of the lower lid 36 via the rubber plate 68 and fixed to the lower lid 36. In the illustrated example, the small-diameter cylindrical tube 40 is a polyethylene tube and has an inner diameter that ensures a necessary clearance with the steel pipe pile 18. In the illustrated example, an annular rib 40a having a triangular cross section for reinforcement is formed on the outer peripheral wall of the small-diameter cylindrical tube 40, and a space formed between the annular rib 40a and the rubber plate 68 is formed. Also, the sound absorbing material 70 is packed. The small-diameter cylindrical tube 40 is not limited to a polyethylene tube, and may be preferably made of a material that is lighter than a steel tube.

  On the other hand, the upper lid 38 has an opening 38a having a diameter through which the hydraulic hammer 20 can be inserted, as shown in FIG. 6, and is fixed to the large-diameter cylindrical tube 34 as shown in FIG. The upper lid 38 also has a sound absorbing material 72 built in a hollow steel wall. Further, in the illustrated example, the upper lid 38 is divided into four parts as indicated by reference numerals 381, 382, 383, and 384, and is structured to be reliably integrated by fixing the connecting tool 74 with bolts. . In addition, each connection tool 74 is used also as a hanging tool for laying the auxiliary winding wire rope 64 (refer FIG. 10) of the crane 30 suitably. Further, in the illustrated example, a rubber plate 76 is disposed in the opening 38a of the upper lid 38 as a cushioning material between the upper lid 38 and the hydraulic hammer 20, and the upper lid 38 has a surface (lower surface) facing the large-diameter cylindrical tube 34. The sound absorbing material 78 is fixed so as to protrude into the opening 38a and come into contact with the hydraulic hammer 20.

  Further, as shown in FIG. 9, the soundproofing device 28 of the hydraulic hammer according to the embodiment of the present invention preferably covers the hydraulic hammer 20 protruding from the opening of the upper lid so as to cover the opening 38a of the upper lid 38. It is preferable to wind the soundproof sheet 80 through a sound absorbing material. As the soundproof sheet 80, it is convenient to use a soundproof sheet normally used at a construction site, but other soundproof sheets can also be used.

  Now, according to the embodiment of the present invention configured as described above, the following operational effects can be obtained. That is, the soundproofing device 28 for a hydraulic hammer according to an embodiment of the present invention includes a large-diameter cylindrical tube 34 and a lower lid 36 and an upper lid 38 that close both ends thereof, and at least an engagement portion with a steel pipe pile of the hydraulic hammer 20. The cover which accommodates a certain anvil 20b and the pile sleeve 20c is comprised. The large-diameter cylindrical tube 34 and the lower lid 36 are in close contact with each other via the sound absorbing material 66 without being fixed to each other, and the auxiliary winding wire rope 64 of the crane 30 provided on each of the lower lid 36 and the upper lid 38. It is used by being suspended by the crane 30 together with the hydraulic hammer 20 suspended from the main wire rope 32 of the crane 30 by means of hangers 56, 58, 60, 62, 74 for slinging.

When the steel pipe pile 18 is driven by the hydraulic hammer 20, the hydraulic hammer 20 is covered with the cover (34, 36, 38), and a portion of the steel pipe pile 18 protruding from the cover has a predetermined length. It is covered with a small diameter cylindrical tube 40 projecting a predetermined length from the opening. Then, as the position of the steel hammer pile 18 is lowered by the hydraulic hammer 20, the hydraulic hammer 20 is also lowered, and the hydraulic hammer 20 rebounds when the steel hammer pile 18 hits the pile head. The large-diameter cylindrical tube 34 and the lower lid 36 can be absorbed by a portion that is in close contact with each other via the sound absorbing material 66 without being fixed to each other, so that the shock applied to the soundproofing device 28 can be attenuated. In this way, the impact sound generated when the hydraulic hammer 20 strikes the pile head of the steel pipe pile 18 is sound-insulated by the large-diameter cylindrical tube 34, the lower lid 36, the upper lid 38, and the small-diameter cylindrical tube 40. .
Contrary to the illustrated example, the large-diameter cylindrical tube 34 and the upper lid 38 are in close contact with each other through a sound absorbing material without being fixed to each other, and the large-diameter cylindrical tube 34 and the lower lid 36 are fixed. It is possible to obtain the same operation and effect by adopting.

In addition, the soundproofing device 28 of the hydraulic hammer according to the embodiment of the present invention prevents leakage of the impact sound generated when the hydraulic hammer 20 strikes the pile head of the steel pipe pile 18 from the opening 36a of the lower lid 36. The sound insulation can be effectively performed by the small-diameter cylindrical tube 40 made of the sound insulating material.
Further, the soundproof sheet 80 wound around the hydraulic hammer 20 projecting from the opening of the upper lid 38 and covering the opening 38a of the upper lid 38 can also effectively shield the impact sound leaking from the opening 38a of the upper lid 38.

In the embodiment of the present invention, the cover constituted by the cylindrical pipe 34 and the lower lid 36 and the upper lid 38 that close both ends of the cylindrical pipe 34 is an anvil 20b that is an engaging portion with a steel pipe pile of the hydraulic hammer 20, and a pile sleeve. The length of the hydraulic hammer 20 can be accommodated, but the length of the hydraulic hammer 20 can be concealed as necessary. The dividing positions of the cylindrical tube 34, the lower lid 36, and the upper lid 38 can be changed as appropriate.
As described above, the soundproofing device for a hydraulic hammer according to the embodiment of the present invention can be easily and reduced in weight as compared with a conventional large soundproofing device (see FIG. 11). It is suitable for application to a hydraulic hammer that is used while suspended.

Now, the noise reduction effect by the soundproofing device of the hydraulic hammer according to the embodiment of the present invention is the result of measurement carried out by the present inventors (JIS A 1417: 2000 “Measurement Method of Air Sound Isolation Performance of Buildings”). )), Was as follows.
That is, the internal / external sound pressure level difference of the cover constituted by the large-diameter cylindrical tube 34 and the lower lid 36 and the upper lid 38 that closes both ends thereof is 43.9 dB at 250 Hz, 42.4 dB at 500 Hz, 43.9 dB at 1 kHz, It was 42.6 dB at 2 kHz and 39.7 kHz at 4 kHz (125 Hz cannot be measured due to background noise). Also, the difference between the internal and external sound pressure levels of the small-diameter cylindrical tube 40 is 29.6 dB at 125 Hz, 31.6 dB at 250 Hz, 32.5 dB at 500 Hz, 40.6 dB at 1 kHz, 42.9 dB at 2 kHz (4 kHz is measured by background noise) Impossible). Thus, according to the soundproofing device for a hydraulic hammer according to the embodiment of the present invention, it has been confirmed that sound insulation is effectively performed.

  18: Steel pipe pile, 20: Hydraulic hammer, 20a: Ram, 20b: Anvil, 20c: Pile sleeve, 28: Soundproof device of hydraulic hammer, 30: Crane, 32: Main wire rope, 34: Large diameter cylindrical pipe, 36 , 361, 362, 363, 364: lower lid, 36a, 38a: opening, 38, 381, 382, 383, 384: upper lid, 40: small diameter cylindrical tube, 42, 44: cylindrical steel tube, 46, 48, 54, 66 , 70, 72, 78: sound absorbing material, 56, 58, 60, 62, 74: connecting tool (hanging tool), 64: auxiliary winding wire rope, 80: soundproofing sheet

Claims (3)

It is a soundproofing device for a hydraulic hammer that is used suspended by a wire rope of a crane,
It has a diameter that can accommodate the engagement part of a hydraulic hammer with a steel pipe pile, and has a large-diameter cylindrical pipe with a built-in sound absorbing material in the wall, and an opening with a diameter that allows the hydraulic hammer or steel pipe pile to be inserted in the center. A cover composed of a lower lid and an upper lid containing a sound-absorbing material in the wall, and a small-diameter cylindrical tube having a diameter through which a steel pipe pile can be inserted and projecting a predetermined length from the opening of the lower lid, The large-diameter cylindrical tube and the lower lid or the upper lid are in close contact with each other through a sound absorbing material without being fixed to each other, and each of the lower lid and the upper lid is hung with a supplementary wire rope of a crane A soundproofing device for a hydraulic hammer, characterized in that a hanging tool is provided. The soundproofing device for a hydraulic hammer according to claim 1, wherein the small-diameter cylindrical tube is made of a sound insulating material. The soundproofing device for a hydraulic hammer according to claim 1 or 2, further comprising a soundproofing sheet wound around a hydraulic hammer protruding from the opening of the upper lid and covering the opening of the upper lid.

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