JP2001152460A - Sound absorber in air-lock device for material passage of pneumatic caisson - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorber in an air-lock device for the material passage of a pneumatic caisson, by which the structure of the whole device is simplified, manufacturing cost is reduced, while the sound-attenuation effect of an air-leakage sound is improved and the generation of adverse effects due to noises to circumferential residents can be prevented. SOLUTION: An inlet side 1a of the material passage 1, in which an earth bucket B for removing earth hung to a wire rope W is lifted and lowered, is closed by a sound-attenuating chamber 11 under a crowned state. The upper wall surface of the sound-attenuation chamber 11 is formed in an open-close cover 13, and a rope inserting hole 14, into which the wire rope W is inserted under a movably inserted state, is formed in the open-close cover 13. Acoustical panels 18 are annexed onto the interior wall surfaces of the sound-attenuation chamber 11 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer for an air lock device installed in a material passage of a pneumatic caisson (pneumatic caisson) used as an underground structure or a substructure, for example.

[0002]

2. Description of the Related Art In a conventional air lock device, as shown in FIG. 13, an earth discharging bucket (not shown) suspended from a wire rope W interlocked with a hoisting machine moves up and down from a material shaft. It is provided between the inlet side a1 and the work room side a2 at the upper part of the material passage a.
The air lock device b is provided with a material passage a
The work chamber side a2 is opened and closed by an opening and closing mechanism c including a fluid cylinder and a link mechanism. The lower door d and the inlet side a1 of the material passage a are closed together with the lower door d to temporarily discharge the earth bucket for earth removal. And an upper door e that forms a lock chamber L composed of a space that can be stowed. The upper door e is divided into a pair of left and right half doors e1 and e2, and a semicircular notch forming a rope insertion hole f is formed on a mating surface of each of the half doors e1 and e2. f1,
f2 is provided. Further, as shown by two-dot broken lines in FIG. 13, the half doors e1 and e2 forming the upper door e can be opened and closed in a horizontally open state while being lowered by the opening and closing mechanisms g1 and g2, respectively. As shown in FIG. 14, the notches f1 and f2 are brought into contact with each other in a state where the doors are closed to form a rope insertion hole f through which the wire rope W is inserted. Has become.

That is, when the earth discharging bucket suspended from the wire rope W is located outside the entrance side a1 of the material passage a, the lower door d is in a closed state and the work room side a2 is closed. Maintain a high pressure state. When the earth discharging bucket is lowered into the material passage a, the earth discharging bucket is lowered to the lock chamber L and temporarily stopped in the open state of the upper door e, and the upper door e is closed. Thereby, the earth bucket for earth discharging is temporarily stored in the lock chamber L. At this time, the wire rope W is loosely inserted into the rope insertion hole f of the upper door e. Then
After the lower door d is opened and the lock chamber L is brought to the same pressure as the high-pressure atmosphere on the work chamber side a2, the earth discharging bucket is lowered toward the work chamber side a2.

On the other hand, when the earth discharging bucket is lifted from the work chamber side a2 of the material passage a to the outside at the time of discharging the earth, the discharging earth bucket is raised to the lock chamber L and stopped once, and the lower door is stopped. By closing the door d, the earth discharging bucket is temporarily stored in the lock chamber L. Next, the upper door e is opened, the lock chamber L is brought to the same pressure as the atmospheric pressure, and then the earth discharging bucket is pulled up from the material passage a to the outside.

[0005] However, in the above-described air lock device having the conventional structure, the excavation work is performed during the excavation while the upper door e is kept closed. However, the excavation work is inserted into the rope insertion hole f of the upper door e. Since the wire rope W is inserted in the loosely inserted state, the high-pressure air in the work chamber side a2 leaks from a gap formed between the wire rope W and the rope insertion hole f, generating a large air leak sound. For this reason, it is a factor that adversely affects the nearby residents due to noise.

Further, in order to solve such a problem, Japanese Patent Publication No. Hei 4-787 filed and filed by the present applicant has been published.
As disclosed in Japanese Patent Publication No. 68, a silencer has been proposed in an air lock device for a material passage of a pneumatic latent box.

As shown in FIG. 15, this silencer has a structure in which a pressure-reducing chamber h which can be separated and opened in a closed state is provided below the rope insertion hole f of the upper door e. A lower rope insertion hole i corresponding to the upper rope insertion hole f is formed at the bottom of the step-down chamber h, and the wire rope W can be inserted into the lower rope insertion hole i together with the upper rope insertion hole f in a loosely inserted state. I do. The other end of the exhaust pipe j having one end communicated with the outside from one half door e1 of the upper door e faces the pressure reducing chamber h, and the wire rope W and the lower rope insertion hole i are passed through the exhaust pipe j. A part of the high-pressure air flowing into the pressure-reducing chamber h from the gap between them is exhausted to the outside of the material passage a. As a result, the pressure of the high-pressure air flowing into the pressure-reducing chamber h decreases, and the pressure-reduced air leaks into the atmosphere from the gap between the wire rope W and the upper rope insertion hole f, so that the air leakage noise is generated. I'm making it smaller.

[0008]

However, in the above silencer in the air lock device for the material passage of the pneumatic latent box, the pressure of the high-pressure air is reduced in the pressure-reducing chamber h, and the wire rope is passed through the pressure-reducing chamber h. Even if the decompressed air is leaked into the atmosphere from the gap between the W and the upper rope insertion hole f, the effect of suppressing the leaked sound is not always sufficient. In addition, since the silencer is installed below the upper door e, not only the structure of the entire device becomes complicated, but also the manufacturing cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and simplifies the structure of the entire device, reduces the manufacturing cost, enhances the noise-reducing effect of air leaks, and provides It is an object of the present invention to provide a silencer in a material passage air lock device for a pneumatic submersible box, which can prevent adverse effects due to noise.

[0010]

In order to solve the above problems, the present invention is configured as follows. According to a first aspect of the present invention, a lower door for closing a work chamber side of a material passage so as to be openable and closable is provided at an entrance side of the material passage on which a grounding bucket for earth removal suspended from a wire rope is lifted. A pressure chamber having a pair of upper doors that can be opened and closed in a horizontal direction and that form a lock chamber that can be closed and temporarily accommodate a grounding bucket for discharging, and a wire rope insertion hole is provided in the upper door. In the air lock device for a material passage, a sound deadening chamber that closes the entrance side of the material passage in a crowned state is provided, and an upper wall surface of the sound deadening room is formed by an opening / closing lid having a rope insertion hole. A soundproof member is attached to the inner wall surface.

A second aspect of the present invention is characterized in that the open / close lid of the sound deadening chamber is configured to be openable on both sides.

A third aspect of the present invention is characterized in that the outer peripheral wall surface of the sound deadening chamber is formed of a cylindrical body having a predetermined height substantially equal to or larger than the diameter of the material passage.

According to a fourth aspect of the present invention, a soundproof member attached to the inner wall surface of the sound deadening room is detachably mounted along the inner wall surface of the sound deadening room, and is wound around the outer peripheral side surface of the ring frame. And a soundproof panel.

The present invention has the above-mentioned structure,
In the closed state of the upper door during excavation work, high-pressure air leaking from the gap between the wire rope suspending and supporting the earth discharging bucket and the rope insertion hole of the upper door has substantially the same diameter or large diameter as the material passage. Flows into a sound-absorbing room composed of a relatively large indoor space having a predetermined height and is decompressed, and most of the noise due to the leak sound generated at that time is absorbed by the soundproof member attached to the sound-absorbing room. Therefore, the noise reduction effect becomes remarkable as compared with the conventional device.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to the drawings shown in FIGS.
FIG. 1 schematically shows the overall configuration of an air lock device for a material passage of a pneumatic latent box according to the present invention.
As shown in (A) and (B), reference numeral 1 denotes a material passage composed of a material shaft on which a grounding bucket B for earth discharging suspended from a wire rope W interlocked with a hoist (not shown) moves up and down. is there.

Then, the inlet side 1 of the material passage 1
An air lock device 2 is provided between a and the work room side 1b. The air lock device 2 is provided with a lower door 3 that closes the work chamber side 1b of the material passage 1. The lower door 3 has an opening / closing mechanism 4 including, for example, a fluid cylinder and a link mechanism, as in the conventional structure. Can be opened and closed. On the entrance side 1a of the material passage 1, an upper door 5 is provided so as to face the lower door 3, and the upper door 5 is provided on the entrance side 1a of the material passage 1.
To form a lock chamber L including a space in which the earth discharging bucket B can be temporarily stored together with the closing of the lower door 3.

The upper door 5 is provided with a rope insertion hole (not shown) through which the wire rope W is inserted in a loosely inserted state, similarly to the conventional structure shown in FIG.
The opening / closing mechanism is the same as that of the conventional opening / closing structure, and a description thereof will be omitted.

Reference numeral 6 denotes a rock landing 6. The rock landing 6 is fitted so as to surround the outer periphery of the entrance side 1a of the material passage 1, and a silencer 10 is installed at a substantially central portion thereof.

As shown in FIGS. 2 and 3, the silencer 10 has a predetermined height which is closed in a crowned state on the upper part of the entrance side 1a of the material passage 1 which faces substantially the center of the landing 6. A silencing chamber 11 is formed. The silencing chamber 11 is made up of a cylindrical body 12 having substantially the same diameter or a large diameter as the material passage 1, and the upper surface of the opening is closed by an opening / closing lid 13. The opening / closing lid 13 includes a pair of left and right semi-circles 13A,
13B, a semicircular notch that forms a rope insertion hole 14 through which the wire rope W is inserted in a loosely inserted state is formed on the mating surface of each of the semicircular plates 13A and 13B. Parts 14A and 14B are provided.
As shown in FIG. 4, a sheet-shaped or panel-shaped sound-insulating member 15 having a large number of small holes is provided on the inner surface of each of the semi-circular plates 13A and 13B forming the opening / closing lid 13. A soundproof member 16 is disposed on the inner wall surface 12a of the cylindrical body 12 forming the sound deadening chamber 11.

As shown in FIG. 5, the soundproof member 16 includes a ring frame 17 and a soundproof panel 18 having a number of small holes wound and held on the outer peripheral side surface of the ring frame 17.
, And the ring frame 17 is
The soundproof panel 1 is detachably fitted and mounted from above along the inner wall surface 12a of the cylindrical body 12 forming the soundproof panel 1.
8 can be attached to the inner wall surface 12a of the cylindrical body 12.

Further, the semi-circular plates 13A, 13B forming the opening / closing lid 13 are brought into close contact with the notches 14A, 14B in a closed state, so that the rope through which the wire rope W is inserted. The insertion hole 14 is formed, and the lid opening / closing mechanism 20 can be opened and closed so that the upper surface of the opening of the cylindrical body 12 forming the muffling chamber 11 is opened. The lid opening / closing mechanism 20 is configured as shown in FIG.
As shown in FIG. 3, the swing cylinder 21 includes a swing link 21 connected to each of the semi-circular plates 13A and 13B, and a fluid cylinder 22 connected to the swing link 21.
The swing link 21 is actuated at this time, as shown by the two-dot broken lines in FIGS.
The upper surface of the opening of the cylindrical body 12 can be opened by tilting and rotating 13B backward from the lid closed state.

In this case, the lid opening / closing mechanism 20 is
Although the opening and closing operation is automatically performed by the first cylinder 1 and the fluid cylinder 22, it may be performed manually.

That is, according to the present invention, FIGS.
When the earth discharging bucket B suspended from the wire rope W is located outside the material passage 1, the lower door 3 is in a closed state as shown in FIG.
b maintains a high pressure state, and the upper door 4 and the open / close lid 13 of the muffler 10 are in a lid open state.

When the earth discharging bucket B is lowered into the material passage 1, FIGS.
As shown in (1), the earth discharging bucket B is lowered into the lock chamber L, temporarily stopped, and the upper door 4 is closed to temporarily store the earth discharging bucket B in the lock chamber L. Then, the lid 13 of the muffler 10 is closed. At this time, the wire rope W is loosely inserted into the rope insertion hole 14 of the opening / closing lid 13. Next, the lower door 3 is opened to make the lock chamber L the same pressure as the high-pressure atmosphere in the work chamber 1b, and then the earth discharging bucket B is lowered toward the work chamber 1b as shown in FIG. It is made to let.

At this time, the upper door 5 during excavation work
In the closed state, the high-pressure air leaks from the gap between the wire rope W suspending the earth discharging bucket B and the rope insertion hole (not shown) of the upper door 5 as before. Although high-pressure noise is generated, the high-pressure air flows into the silencer 11 of the silencer 10, which is a relatively large room installed above the material passage 1, and is decompressed. Most of the
The sound is absorbed by the porous soundproofing members 15 and 18 provided inside the sound deadening chamber 11 to be muffled.

On the other hand, at the time of earth discharging,
When the material is lifted from the work room side 1b of the material passage a to the outside, the earth discharging bucket B is lifted to the lock chamber L, temporarily stopped, and the lower door 3 is closed. Is temporarily accommodated in the lock chamber L. Next, the upper door 4 and the opening / closing lid 13 of the muffling device 10 are opened to make the lock chamber L the same pressure as the atmospheric pressure, and then the earth discharging bucket B is pulled up from the material passage 1 to the outside. ing.

The following Tables 1, 2, 3 show the results of a noise measurement test using the silencer 10 of the present invention. In this case, the working pressure on the work chamber side 1b of the material passage a is:
0.1 to 0.4 MPa (1.0 to 4.0 kgf / c
m ²⁾ to be measured at a pitch of 0.1MPa (1.0kgf / cm ^2). Further, as shown in FIG. 2, the measurement positions were collected at the measurement points A, B, C, D, and E on the rock landing 6, respectively, and the open / closed state of the open / close cover 13 shown in Table 1 (O
PEN), lid closed state (CIOSE) shown in Table 2, Table 3
The state without the soundproofing member indicated by is collected. The measured value is used as the power level of the sound source, a point sound source and a semi-free space are determined according to the measurement conditions, and the distance attenuation is calculated based on the theoretical value based on the following formula for calculating the theoretical value of the distance attenuation. The data collected above is taken as the average value. Lr = Lw−20logr−8 Lr: Intensity (dB) at a position r (m) away from the sound source
A) Lw: Power level of sound source (dB A)

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

[Table 3] (Note) The values in Table 3 are the values at the measurement point E of the data obtained by directly collecting the air leak sound from the sound deadening chamber 11 with the opening / closing lid 13 opened.

FIGS. 9 to 12 show the distance attenuation state based on the measurement results in Tables 1, 2 and 3 above. FIG. 9 shows the case where the working pressure is 0.1 MPa (1.0 kgf / cm ² ). FIG. 10 shows that the working pressure is 0.2 MPa (2.0
Attenuation state at kgf / cm ^2), FIG. 11 is the distance attenuation state and 12 of the working pressure is at 0.3MPa (3.0kgf / cm ²⁾ is operating pressure 0.4 MPa (4.0 kg
f / cm ² ).

The present invention is not limited to the above embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0033]

As described above, according to the silencer of the air lock device for a material passage of a pneumatic submersible box according to the present invention, the earth discharging bucket is suspended when the upper door is closed during excavation work. High-pressure air leaking from the gap between the wire rope to be inserted and the rope insertion hole of the upper door flows into a sound deadening chamber having a relatively large indoor space having a predetermined height substantially the same diameter or a large diameter as the material passage. This reduces the pressure, and most of the noise due to the leak sound generated at that time is absorbed by the soundproofing member attached to the sound deadening room, so that the sound deadening effect becomes remarkable. It is possible to prevent noise harm from occurring to the residents. In addition, since the structure of the entire device can be simplified, manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 shows an overall configuration of an air lock device for a material passage of a pneumatic latent box according to the present invention, and FIG. 1 (A) is a schematic longitudinal sectional view of a silencer in a closed state, and FIG. 1 (B).
FIG. 2 is a plan view seen from the direction of the arrow II in FIG.

FIG. 2 is a plan view seen from the direction of arrows II in FIG. 1;

FIG. 3 is an enlarged plan view of FIG. 2;

FIG. 4 is an enlarged vertical sectional view of the silencer in a lid closed state.

FIG. 5 is an enlarged perspective view of a main part of the sound deadening member, which is mounted in a sound deadening chamber of the sound deadening device, partially cut away.

FIG. 6 is an explanatory view of a lid opening / closing mechanism of the muffler.

7 shows a state in which the earth bucket is lowered into the material passage in a state where the opening / closing lid of the muffler is open, FIG. 7 (A) is a schematic longitudinal sectional view, and FIG. 7 (B) is FIG. It is the top view seen from the II-II arrow direction of A).

8 shows a state where the earth bucket is housed in the lock chamber of the material passage, FIG. 8 (A) is a schematic longitudinal sectional view, and FIG. 8 (B) is an arrow III-III of FIG. 8 (A). It is the top view seen from the viewing direction.

FIG. 9 also shows that the operating pressure is 0.1 MPa (1.0 kgf).
/ Cm ² ) is an explanatory diagram showing a distance attenuation state based on a noise measurement test result at (cm / cm ² ).

[FIG. 10] Similarly, the operating pressure is 0.2 MPa (2.0 kg).
It is an explanatory view showing a distance attenuation state based on a noise measurement test result at (f / cm ² ).

FIG. 11 is also a diagram showing a working pressure of 0.3 MPa (3.0 kg).
It is an explanatory view showing a distance attenuation state based on a noise measurement test result at (f / cm ² ).

FIG. 12 is also a diagram showing a working pressure of 0.4 MPa (4.0 kg).
It is an explanatory view showing a distance attenuation state based on a noise measurement test result at (f / cm ² ).

FIG. 13 is a schematic longitudinal sectional view showing a configuration of a main part of a conventional air lock device for a material passage of a pneumatic latent box.

FIG. 14 is an essential part enlarged explanatory view showing a state in which a leak sound is generated when the upper door is closed in a conventional material passage.

FIG. 15 is an enlarged explanatory view of a main part showing a state in which the air leakage sound is muted when the upper door is closed in the conventional material passage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Material passage 1a Inlet side 1b Work room side 2 Air lock device 3 Lower door 4 Opening / closing mechanism 5 Upper door 6 Lock landing 10 Silencer 11 Silencer room 12 Cylindrical body 12a Inner wall surface 13 Opening / closing lid 13A Semi-circular plate 13B Semi-circular plate 14 Rope insertion hole 15 Soundproof member 14A Notch portion 14B Notch portion 16 Soundproof member 17 Ring frame 18 Soundproof panel 20 Lid opening / closing mechanism 21 Swing link 22 Fluid cylinder B Earth discharging earth bucket L Lock chamber W Wire rope

Claims (4)

[Claims] 1. A lower door for opening and closing a work chamber side of a material passage at an entrance side of a material passage in which a grounding earth bucket suspended from a wire rope is lifted and lowered, and the material together with the lower door. A pair of upper doors that can be opened and closed in the horizontal direction to form a lock chamber in which the passage is closed to form a lock chamber in which the earth discharging bucket can be temporarily stored, and the upper door has an insertion hole for the wire rope. In the air lock device for a material passage of a compressed air latent box provided, a sound deadening chamber for closing the entrance side of the material passage in a crowned state is provided, and the upper wall surface of the sound deadening chamber is formed by an open / close lid having a rope insertion hole. A sound deadening device in an air lock device for a material passage of a pressurized latent box, wherein a soundproof member is attached to an inner wall surface of the sound deadening chamber. 2. The muffler according to claim 1, wherein an opening / closing lid of the muffling chamber is configured to be openable in both directions. 3. The air pressure latent chamber according to claim 1, wherein an outer peripheral wall surface of the muffling chamber is formed of a cylindrical body having a predetermined height substantially equal to or larger than the material passage. Muffler in the air lock device for material passages. 4. A soundproof member attached to an inner wall surface of the sound deadening chamber, the ring frame being detachably mounted along the inner wall surface of the sound deadening chamber, and wound around an outer peripheral side surface of the ring frame. 4. A muffler in a material passage air lock device according to claim 1, 2 or 3, wherein the muffler is formed by a soundproof panel.