JP3813141B2 - Material lock wire guide silencer - Google Patents

Description

  The present invention relates to a silencer for reducing noise generated in a wire guide portion of a material lock used in a pneumatic caisson method.

  In the pneumatic caisson method, as is well known, in order to prevent inundation and the like, excavation work is performed with the work chamber at the bottom of the caisson at a high pressure, so that its airtightness must be ensured. In particular, as shown in FIG. 4, in the material shaft 1, since the earth discharging bucket 3 is carried in and out from the top of the material lock 2 using an external crane or the like, the airtightness is important. Moreover, when raising / lowering the earth removal bucket 3 in the material shaft 1, since the wire rope which suspends the bucket penetrates the part of the upper door of the material lock 2, the space | gap between a wire rope and its wire guide Will leak from. For this reason, a leaking sound is generated, and as the atmospheric pressure in the working chamber increases, the leaking sound gradually increases and becomes a problem as construction noise.

  FIG. 5 is an example of a conventional material lock. The material lock 2 is provided with, for example, a pair of left and right semi-circular upper doors 4 and 4 and lower doors 5 and 5 which swing open and close downward, and when the earth discharging bucket 3 is carried in, the upper door 4 is opened. The earth removal bucket 3 is inserted, the upper door 4 is then closed, the space between the upper and lower doors is pressurized, the lower door 5 is opened, and the earth removal bucket 3 is lowered. When unloading the earth bucket 3, if the earth bucket 3 is located in the space between the upper and lower doors, the lower door 5 is closed, the space between the upper and lower doors is decompressed by exhausting, and then the upper door 4 is opened. Then, the earth discharging bucket 3 is carried out upward.

  A wire guide 8 that forms an insertion hole 7 through which the wire rope 6 penetrates is provided in the central portion of the closing surface of the upper doors 4 and 4 in plan view, and from the gap between the wire rope 6 and the wire guide 8. High-pressure air leaks and a loud sound is generated. Conventionally, the following method has been proposed as a noise reduction measure for reducing such a leak sound.

  (1) The silencer described in Patent Document 1, as shown in FIG. 6, is divided into two on the material lock 2 and can be opened and closed to the left and right. 10 and 10, the sound absorbing material 12 is filled between the perforated steel plates 11 and 11 of the box door 10, and the high-pressure airflow leaking from the gap between the wire rope 6 and the wire guide 8 is generated in the space inside the box door 10. The air that has been expanded and further reduced in pressure to some extent is passed through the sound absorbing material 12 such as glass wool and diffused into the atmosphere. A wire guide 14 that forms a wire rope insertion hole 13 is also provided at the center of the top end of the box door 10.

  (2) The silencer described in Patent Document 2, which is provided with a silencer chamber that closes the entrance side of the material passage in a crowned state, and can be double-opened on a cylindrical body that forms the outer peripheral wall surface of the silencer chamber A high pressure leaks out from the gap between the wire and the wire insertion hole of the upper door by providing a soundproof member comprising a soundproof panel having a ring frame and a number of small holes on the inner wall surface of the cylindrical body. Air is introduced into the silencer to reduce the pressure, and most of the noise caused by the leaked sound is absorbed by a soundproof member attached to the wall of the silencer.

In addition, as technical literature related to the present invention, an exhaust pipe is connected to an exhaust port in the lock chamber between the upper and lower doors through an exhaust valve, and a plurality of silencers are attached to the exhaust pipe, so that the exhaust sound is sufficient. Patent Document 3, which describes a silencer designed to be small, is provided with an openable / closable decompression chamber surrounding the wire from both sides at the lower part of the upper door, and the decompression chamber is opened to the atmosphere via a communication pipe and a silencer. Patent Document 4, which describes a silencing structure that eliminates noise caused by air leakage, an openable and airtight chamber that surrounds the wire from both sides is provided at the upper part of the upper door. There exists patent document 5 etc. in which the silencer which discharge | releases to air | atmosphere is described.
Japanese Patent No. 2895478 Japanese Patent No. 3380854 JP 05-311669 A JP 2002-105965 A JP 2002-173940 A

  When a silencing chamber such as a box door is provided on the material lock as in Patent Documents 1 and 2 described above, noise generated by high-pressure airflow leaking from the gap between the wire rope and the wire guide is reduced. However, after the high-pressure air flow is once accumulated in the silencer chamber, air accumulated in the silencer chamber leaks from the wire guide at the ceiling of the silencer chamber, and noise is generated from the ceiling of the silencer chamber. .

  The present invention has been made to solve such problems, and at the same time reducing leakage noise due to high-pressure air leaking from the gap between the wire rope of the upper door of the material lock and the wire guide. The material that can reduce the leakage sound from the wire guide at the top of the sound deadening room due to the box door etc., and can surely reduce the noise generated in the wire guide part of the material lock equipped with the sound deadening room at the top It aims at providing a lock wire guide silencer.

Claim 1 of the present invention is for reducing noise generated by high-pressure airflow leaking from the gap between the wire guide and the wire rope of the wire rope insertion hole of the upper door that closes the upper portion of the material lock so that it can be opened and closed. In the material lock wire guide silencer, a silencer chamber is provided on the material lock. The silencer has a space that is surrounded by a silencer above the upper door, and has a door that can be opened and closed. The material lock wire guide silencer is characterized in that the silencer chamber is provided with a forced discharge device that sucks the air in the silencer chamber and forcibly discharges it to the outside.

1 is a forced suction type as shown in FIG. 2, and the forced discharge device includes a discharge pipe for forced suction in which one end is inserted and attached to a mounting hole formed in a side wall or the like of the muffler chamber, and the discharge. It can comprise a suction device connected to the other end of the tube. About two forced discharge devices may be disposed at intervals in the circumferential direction of the muffler chamber.

According to a second aspect of the present invention, in the silencer according to the first aspect , a silencer is provided at the tip of the suction device of the forced discharge device. In this case , the noise generated when air is discharged from the suction device is silenced by the silencer.

  In the present invention, the silencing chamber is provided with an open / close door so that a soil removal bucket suspended by a wire rope can pass through, and the open / close door has an upper center 2 as shown in FIGS. A box-shaped box door that is divided and can be opened and closed to the left and right, or a flat door that closes the upper surface of the muffler chamber so as to be openable and closable can be used. The open / close door is provided with a wire guide that forms a wire rope insertion hole, similarly to the upper door. In addition, as the sound deadening member, a sound absorbing material such as glass wool is filled between the porous double walls and the sound is absorbed by passing air, or a porous soundproofing material is attached to the inner surface of the sound deadening chamber body and the door, A type that absorbs sound can be used.

  In the present invention configured as described above, when the earth discharging bucket moves up and down in the material shaft, the upper door and the opening and closing doors of the silencing chamber are closed, and the wire guides provided on these doors are connected to the wire of the earth discharging bucket. The rope penetrates. The high-pressure airflow that leaks from the gap between the wire guide of the upper door and the wire rope expands and depressurizes in the space of the muffler chamber provided above the upper door. Reduces leaking sound that passes through the sound absorbing material such as glass wool and diffuses into the atmosphere, or is absorbed by soundproofing material attached to the inner surface of the wall of the silencer chamber, and leaks from the gap between the wire guides of the upper door can do.

Furthermore, the air accumulated in the silencer chamber leaks from the wire guide at the top of the silencer chamber. However , the forced discharge device provided in the silencer chamber forcibly sucks and discharges the high-pressure air flow in the silencer chamber. Air leaking from the wire guide at the top end is eliminated, and noise generated therefrom can be reduced. Further , by providing a silencer at the outlet of the forced discharge device, exhaust noise can be reduced and noise can be further reduced.

As described above, according to the present invention, the high-pressure air flow that leaks from the gap of the upper door is once expanded into the space of the sound deadening chamber and depressurized, and the air that has been further reduced to a certain level is the sound absorbing material and soundproofing material of the sound deadening chamber. by the sound absorption, the air leakage sound leaking from the gap of the wire guide above the door can be significantly reduced, further, by forcibly sucking the high pressure air flow muffler chamber by forced discharge device provided muffling chamber Since it discharges, the noise generated from the top of the silencer chamber can be greatly reduced, and the noise generated in the wire guide portion of the material lock having the silencer chamber at the upper part can be surely reduced.

Hereinafter, the present invention will be described based on the illustrated embodiments. This embodiment is an example in which the present invention is applied to a material lock provided with a silencer chamber by a box door. FIG. 1 is an example of a spontaneous emission type silencer, and FIG. 2 is an example of a forced suction type silencer of the present invention .

  In FIG. 1, the material lock 2 provided on the upper part of the material shaft is provided with a pair of left and right semicircular upper doors 4 and 4 and lower doors 5 and 5 that swing open and close downward.

  A door opening / closing link 21 is attached to a support member 20 provided on the upper shoulder of the upper bulging portion of the material lock 2 so as to be rotatable in the vertical direction. A semicircular upper door 4 is formed on the door opening / closing link 21. The upper door 4 opens and closes up and down by extending and retracting the door opening and closing cylinder 22 installed and disposed between the lower end of the door opening and closing link 21 and the support member 20. When the pair of left and right upper doors 4, 4 are closed, the tip members 23 are closed with a sealing surface, and a wire guide 8 that forms the insertion hole 7 of the wire rope 6 is provided at the center in plan view. Further, the sealing member 25 of the upper door 4 abuts on the ring member 24 in the upper opening of the material lock 2, thereby ensuring airtightness.

  The lower door 5 has the same configuration, and opens and closes up and down by expanding and contracting the door opening / closing cylinder 22. However, since the lower door 5 raises and lowers the soil removal bucket 3 in an open state, there is no need to provide a wire guide for the wire rope 6, and the tip members 23 are closed with an inclined sealing surface to ensure airtightness. ing. Needless to say, the upper door 4 and the lower door 5 are not limited to the above-described examples, and may be in other forms.

  Further, a supply pipe 26 for supplying air from the outside into the lock chamber A and an exhaust pipe 27 for discharging high-pressure air in the lock chamber A to the outside are connected to the upper bulging portion of the material lock 2. A silencer 28 is provided at the tip of the exhaust pipe 27.

  In the upper part of the material lock 2, the upper part of the sound deadening room B is formed by the box doors 10, 10 which are divided into two at the center of the upper part and can be opened / closed to the left and right and have a reverse cup shape. A short cylindrical side wall 15 is provided on the ring member 24, and the lower portion of the sound deadening chamber B is formed by the cylindrical side wall 15 and the ring member 24, and the lower end portion of the box door 10 is installed on the cylindrical side wall 15. . The box door 10 is attached to the support member 16 provided outside the cylindrical side wall 15 so as to be rotatable in the left-right direction, and the door opening / closing cylinder 17 disposed between the support member 16 and the box door 10 is expanded and contracted. The box door 10 opens and closes left and right.

  The box door 10 and the cylindrical side wall 15 are configured, for example, by filling a sound absorbing material 12 such as glass wool between inner and outer porous steel plates 11 and 11 constituting a porous double wall. It should be noted that the present invention is not limited to such a combination of a perforated steel plate and a sound absorbing material, but may be a form in which a soundproof material is attached to the inner wall surface of the door.

  When the pair of left and right box doors 10 and 10 are closed, the front end surfaces are closed with a sealing surface, and a wire guide 14 that forms an insertion hole 13 for the wire rope 6 is provided at the center in plan view of the top end.

  In the silencer chamber B having such a configuration, in the embodiment of FIG. 1, a plurality of spontaneous discharge ports 30 are provided in the cylindrical side wall 15 at intervals in the circumferential direction, and the air accumulated in the silencer chamber B is naturally discharged to the outside. It can be released. The spontaneous discharge port 30 can be configured by inserting and arranging a discharge pipe 31 in a mounting hole horizontally drilled in the cylindrical side wall 15. A small silencer 32 is attached to the tip of the discharge pipe 31, and air is Noise generated when passing through the discharge pipe 31 is silenced.

  In the embodiment of FIG. 2, a forced discharge port 40 is provided in the cylindrical side wall 15, a forced discharge device 41 is connected to the forced discharge port 40, and a high-pressure air flow in the muffler chamber B can be sucked and forcedly discharged to the outside. And The forced discharge device 41 can be configured by inserting one end of a discharge tube 42 for forced suction into a mounting hole horizontally drilled in the cylindrical side wall 15 and connecting the suction device 43 to the other end. Also, a silencer 44 is attached to the discharge side of the suction device 43.

  Since this forced discharge device 41 is forced discharge, it is sufficient to arrange about two places at intervals in the circumferential direction of the cylindrical side wall 15. There are a method of installing the suction device 43 on the side surface of the material lock 2 (illustrated example) and a method of installing the suction device 43 in a place away from the material lock 2 (not shown). In the latter case, the discharge tube 42 may be extended. Other configurations are the same as the spontaneous emission type in FIG.

  The material lock 2 having the above configuration operates as follows (see FIG. 3). This is the case of the spontaneous emission type. The same applies to the forced suction type.

  (1) When carrying in the earth discharging bucket 3, the box door 10 and the upper door 4 are opened and the earth removing bucket 3 is carried into the lock chamber A. Next, after closing the upper door 4 and subsequently closing the box door 10, the on-off valve of the supply pipe 26 is opened to supply air into the lock chamber A and pressurize (see FIGS. 3 (i) to (iii)). )

  (2) The lower door 5 is opened and the soil removal bucket 3 is lowered. After the excavated soil is loaded at the bottom of the caisson, the soil rises to the lock chamber A (see FIG. 3 (iv)).

  3 (iv), with the lower door 5 open, the material lock 2 is in a high pressure state, and air leaks from the gap of the portion of the upper door 4 of the wire rope 6 that suspends the soil removal bucket 3 through the wire guide 8. However, this air leakage expands primarily in the space of the silencer chamber B formed by the closed box door 10, and further expands and diffuses into the atmosphere through the sound absorbing material 12 such as glass wool and many holes of the porous steel plate 11, A large leak sound from the wire guide 8 of the upper door 4 can be reduced. When a sound absorbing material 12 such as glass wool is used, high pressure air expands once and lowers the pressure to some extent, and then passes through a fine mesh hole such as glass wool to lower the pressure in two steps to atmospheric pressure. . Further, the air accumulated in the sound deadening chamber B is spontaneously discharged to the outside from the many natural discharge ports 30, and the air leaking from the wire guide 14 of the box door 10 is reduced, and the air leakage from the wire guide 14 of the box door 10 is performed. Sound can be reduced. In addition, the sound leaking from the spontaneous discharge port 30 is silenced by the silencer 32.

  In the case of the forced suction type, the forced discharge device 41 forcibly sucks and discharges the high-pressure air flow in the muffler chamber B, so that there is no air leaking from the wire guide 14 of the box door 10, and the wire guide of the box door 10. Leakage sound from 14 can be eliminated.

  (3) When carrying out the earth discharging bucket 3, after closing the lower door 5, the on-off valve of the exhaust pipe 27 is opened, and the high-pressure air in the lock chamber A is released from the silencer 28 to the atmosphere (FIG. 3). (See (v)). Since the exhaust gas passes through the silencer 28, the exhaust noise is reduced. Next, the upper door 4 is opened, then the box door 10 is opened, and the earth discharging bucket 3 is suspended upward (see FIG. 3 (vi)).

  In addition, although the example which applied this invention to the silencing room by the porous double wall and the box door of a sound-absorbing material was shown above, it is not limited to this, and the present invention is also applied to other silencing rooms of other door systems and silencing systems. It goes without saying that can be applied.

Is one embodiment of the spontaneous emission type Ma Te real lock wire guide silencers, (a) shows the vertical cross-sectional view, (b) is a plan view, (c) is a horizontal sectional view, (d) one example of the wire guide FIG. It is one Embodiment of the forced suction type of the material lock wire guide silencer of this invention, (a) is a vertical sectional view, (b) is a top view, (c) is a horizontal sectional view. It is a vertical sectional view which shows the operation situation of the material lock wire guide silencer of the present invention in order. It is a vertical sectional view showing a material lock of a conventional general pneumatic caisson. It is a vertical sectional view showing a conventional material lock. It is the material lock wire guide silencer provided with the conventional silencing chamber, (a) is a vertical sectional view, (b) is a top view, (c) is a horizontal sectional view.

Explanation of symbols

A ... Lock room B ... Silence room 1 ... Material shaft 2 ... Material lock 3 ... Soil bucket 4 ... Upper door 5 ... Lower door 6 ... Wire rope 7 ... Insertion hole 8 ... Wire Guide 10 ... Box door 11 ... Perforated steel plate 12 ... Sound absorbing material 13 ... Insertion hole 14 ... Wire guide 15 ... Cylindrical side wall 16 ... Support member 17 ... Door open / close cylinder 20 ... Support member 21 ... Door opening / closing link 22 …… door opening / closing cylinder 23 …… tip member 24 …… ring member 25 …… seal member 30 …… spontaneous discharge port 31 …… discharge tube 32 …… muffler 40 …… forced discharge port 41 …… forced Discharge device 42 ... discharge tube 43 ... suction device 44 ... silencer

Claims (2)

In the material lock wire guide silencer to reduce the noise generated by the high pressure air flow leaking from the gap between the wire guide and the wire rope of the wire rope insertion hole of the upper door that closes the top of the material lock so that it can be opened and closed,
On the material lock, there is provided a silencing chamber with a door surrounded by a silencing member above the upper door, and a door that can be opened and closed so that the upper portion of the space can be opened and closed. A material lock wire guide silencer characterized in that a forced discharge device for sucking indoor air and forcibly discharging it to the outside is provided. The silencer of Claim 1 WHEREIN: The silencer is provided in the front-end | tip of the suction device of a forced discharge apparatus, The material lock wire guide silencer characterized by the above-mentioned.

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