JPH0781516B2 - Degassing treatment method with mixed air bubbles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for degassing a mixture of air bubbles, and more specifically, in cutting by a shield machine, reducing cutting resistance between a face ground surface and a cutter bit. Alternatively, the present invention relates to a degassing treatment method for removing bubbles from excavated shear mixed with bubbles supplied to enhance fluidity and water blocking performance against excavated shear.

[Conventional technology]

When excavating with an earth pressure shield machine, a liquid containing a foaming agent is injected in front of the partition wall of the shield machine in order to reduce the cutting resistance between the face of the face and the cutter bit, or to improve the fluidity and water shutoff against excavation shear. Alternatively, a method of directly injecting air bubbles to mix the air bubbles in the excavation shear is adopted.

Conventionally, air bubble mixture is discharged from a discharge facility without causing collapse of the face due to pressure drop, while maintaining a predetermined pressure at the front side of the partition wall from under pressure on the front side of the partition wall to under atmospheric pressure on the rear side, It was taken to the dump site as it was.

However, it takes a long time for the bubbles to escape from the bubbles accumulated in the dump site. In addition, there is a problem that air bubbles do not deaerate depending on the soil quality and form soft ground that is present in the shear and is difficult to improve.

In order to improve such a problem, there is a conventional method of eliminating bubbles in the shear by leaving the bubble-blended mixture in a natural state or by adding an antifoaming agent to the bubble-blended mixture and stirring and mixing. It has been taken. (For example, Japanese Unexamined Patent Publication No. 63-134790) [Problems to be solved by the invention] By the way, the method of leaving the mixed air bubbles in a natural state requires a long time and requires a vast treatment site, which is economical. Does not accompany. In addition, there were many problems such as bubbles not escaping depending on the soil quality.

The method of adding an antifoaming agent without mixing with air bubbles and stirring and mixing it is not economical because the amount of antifoaming agent used is large depending on the soil quality, and defoaming treatment is often not possible with cohesive soil. It was

The object of the present invention was made in order to solve the above-mentioned problems, and it is possible to perform a complete deaerating treatment on all soils, and further, the debris can be economically admixed with air bubbles. It is to provide a degassing treatment method.

[Means for Solving the Problems]

In order to solve the above problems, the first aspect of the present invention is directed to a foaming agent foaming method or direct injection in order to reduce the cutting resistance between the face of the face and the cutter bit, or to improve the fluidity and the water blocking property against excavation shear. Excavation mixture containing air bubbles injected by the method, in the discharge facility that communicates with the front of the partition behind the partition of the shield machine, imparts vibration, stirring and compression with decompression in the decompression device, When decompressing while compressing, the volume increases in proportion to the pressure,
When the interfacial tension of the bubbles is exceeded, the bubbles are broken and the bubbles are degassed from the mixed bubbles, and the degassed drilling shear is kept under the atmospheric pressure behind the bulkheads while maintaining a predetermined pressure in front of the bulkheads. It is configured to be discharged by the discharge facility.

A second aspect of the present invention is to reduce the cutting resistance between the face of the face and the cutter bit, or to improve the fluidity and water stoppage against excavation shear, the bubbles injected by the foaming agent foaming method or the direct injection method are mixed. The excavated excavation is discharged by the discharge facility at the rear of the bulkhead while maintaining the applied pressure in the front of the bulkhead of the shield machine at a predetermined pressure, and the discharged mixed air bubbles are vibrated and stirred as the pressure is reduced in the decompression device. Also, when the pressure is applied and the pressure is reduced while compressing, the volume increases in proportion to the pressure, and when the interfacial tension of the bubbles is exceeded, the bubbles are broken and the bubbles are degassed from the mixed bubbles. It is configured in.

[Action]

At the time of excavation by the earth pressure type shield excavator, air bubbles are mixed in the excavation shear in order to reduce the cutting resistance between the face of the face and the cutter bit or to improve the fluidity and water shutoff against the excavation shear.

When excavated with bubbles mixed in the discharge facility or under atmospheric pressure after discharge, vibration, stirring and compression are applied along with the pressure reduction in the decompression device, and when the pressure is reduced while compressing, the volume becomes pressure. When the interfacial tension of the bubbles is exceeded, the bubbles are broken, and degassing treatment is performed to degas the bubbles from the mixed bubbles, and the mixed bubbles are removed.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 to FIG. 3 show different examples in the case where deaeration with inclusion of bubbles is performed in the discharge facility of the earth pressure type shield machine.

First, in the example shown in FIG. 1, an earth pressure type shield excavator 1 is provided with a shield jack 3 for advancing the shield body 2 by applying a reaction force to a segment 4 at a rear portion of the shield body 2 and a front portion thereof. A rotary cutter head 5 for cutting the face ground 6 is provided, a rotary cutter head 5 is supported behind the rotary cutter head 5, a partition wall 7 for suppressing the face earth pressure is provided, and an earth pressure chamber 8 is formed.

The cutter head 5 is provided with an injection pipe 9 for injecting air bubbles into the face ground 6, and the partition wall 7 is provided with an injection pipe 10 for supplying air bubbles to the excavation shear taken into the earth pressure chamber 8. ing. Further, on the back surface of the cutter head 5, a scraping plate 11 for scraping up the excavation shear is installed in the earth pressure chamber 8.

According to the earth pressure type shield machine 1 described above, the cutting ground 6
Is a cutter bit attached to the cutter head 5 due to the action of bubbles supplied from the cutter head 5.
Cutting resistance of 12 is reduced, drilling shear is improved in fluidity and water resistance, and screw conveyor while resisting face earth pressure
It has the feature that it can be discharged from 13.

A slide gate 14 and a rotary feeder 15 are connected to the screw conveyor 13, and a decompression for accommodating the air bubble-containing waste discharged from the screw conveyor 13 between the discharge port of the rotary feeder 15 and the end of the belt conveyor 18 on the receiving side. A device 16 is arranged.

The bubbles mixed with bubbles that have entered the decompression device 16 increase in volume in proportion to the pressure when the pressure is reduced, and when the interfacial tension of the bubbles is exceeded, the bubbles will be broken, and the bubbles will not be mixed. Bubbles are degassed.

The degassed excavation slide is conveyed from the slide gate 17 of the decompression device 16 to the slide trolley (not shown) by the belt conveyor 18 and is carried out to the outside of the mine.

Next, in the example shown in FIG.
Built in.

In the example shown in FIG. 2, the discharge of bubbles mixed with the sliding gate 14 provided on the screw conveyor 13 has the same structure as the example shown in FIG. The air bubble-mixed sludge discharged from the slide gate 14 is placed on a shear trolley 19 with a pressure reducing device by a belt conveyor 18.

While the slide dolly 19 with a pressure reducing device is being towed by a battery car (not shown) to a slide-out vertical shaft (not shown), the pressure reducing device 16 deaerates bubbles from the mixed bubbles. The excavated excavated slide is carried out of the mine.

In the example shown in FIG. 3, the pressure reducing device 16 is installed on the screw conveyor 27.
It is provided in.

In the example shown in FIG. 3, the processing for removing air bubbles up to the earth pressure chamber 8 surrounded by the partition wall 7 has the same structure as the example shown in FIG.
27 has the same structure as that proposed by one of the applicants in Japanese Patent Laid-Open No. 63-134790, and the screw part 27 is provided in the screw conveyor 27 for discharging the air bubble-containing shear coming out from the earth pressure chamber 8. A spherical member 21 is attached to the screw, and the screw portion 33 moves back and forth between the funnel-shaped portions 20 to easily adjust the discharge amount of air bubbles and the predetermined pressure under pressure. Be done.

When a predetermined amount of air bubbles mixed in is taken in behind the funnel-shaped portion 20, the screw portion 33 to which the spherical member 21 is attached is moved forward, and a section from the rear of the funnel-shaped portion 20 to the slide gate 26. Is closed, and the decompression device 16 attached to the screw conveyor 27 performs a degassing process of bubbles mixed in the section taken in the section.

The degassed excavation slide is conveyed from the slide gate 26 through the belt conveyor 18 to the slide trolley (not shown) and is carried out to the outside of the mine.

A slide gate 25 is attached to the screw conveyor 27 in front of the funnel-shaped portion 20, and the spherical member 21.
It is possible to deal with the trouble caused by the sudden change of the ground when the attached screw portion 33 moves rearward.

In the example shown in FIG. 4, the degassing process including bubbles is performed in a portion discharged from the discharge facility to the atmospheric pressure. The atmospheric pressure means the inside of the shield machine and the tunnel. Inside or on the ground, and the drawing shows the case where the decompression device 16 is arranged on the ground.

In FIG. 4, the structure up to the belt conveyor 18 shown in FIG. 2 has the same structure as the example of FIG. The air bubble mixed shear is transported to the shaft by the general shear truck 28,
Only the cargo bed portion 30 of the above-mentioned trolley 28 is gantry crane 29
Suspended by, and the mixed air bubbles are collected in the decompression device 16 and deaerated. The processed excavation debris is transferred from a hopper 32 to a dump truck (not shown) and transported to a dump site.

In any of the above examples, the decompression device 16 not only simply decompresses, but also applies vibration and agitation along with this decompression, and also uses a compression device to decompress while decompressing bubbles mixed with air bubbles. Then, deaeration is carried out, and deaeration is surely and efficiently carried out by decompression and accompanying compression.

〔The invention's effect〕

As described above, according to the present invention, the debris generated by the earth pressure shield machine is reduced by the decompression device, and vibration, stirring and compression are applied along with the decompression, and degassing is performed by the decompression and compression. As a result, the volume of bubbles mixed with the bubbles increases in proportion to the pressure, and the bubbles exceeding the interfacial tension of the bubbles are broken, and the bubbles are degassed from the bubbles mixed with the bubbles. Degassing due to the mixture can be reliably performed at low cost, and the economical efficiency can be improved.

In addition, degassing by decompression and compression accompanying this decompression can surely deaerate the bubbles in the excavation shear, and it is possible to completely deaerate all soils regardless of the type and nature of soil. At the dump site, natural deaerated sludge will accumulate.

[Brief description of drawings]

1 to 4 are vertical cross-sectional views showing different examples of a degassing apparatus for carrying out the degassing method according to the present invention. 1 ... Earth pressure shield machine, 5 ... Rotating cutter head, 6 ... Face ground, 7 ... Bulkhead, 8 ... Earth pressure chamber, 13,
27 …… Screw conveyor, 16 …… Decompressor, 18 …… Belt conveyor, 19, 28 …… Sliding truck.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Hongo 52-6 Nadayama-cho, Nada-ku, Kobe-shi, Hyogo Prefecture No. 503 Nada-Touyama Residence (72) Inventor Goro Moriguchi 4-17-29 Shimoshinjo, Higashiyodogawa-ku, Osaka-shi, Osaka (72) Inventor Tsuyoshi Asada 1 Kono housing complex 1B ridge, Room 306, No. 10 Konoike car park, Itami City, Hyogo Prefecture (72) Inventor Susumu Sarada 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe City Kawasaki Heavy Industries, Ltd. Kobe Factory (56) Reference JP 62-273398 (JP, A) JP 62-273397 (JP, A) JP 61-83800 (JP, A) JP 54-27278 (JP, B2) Japanese Patent Publication Sho 63-44034 (JP, B2)

Claims (2)

[Claims] 1. Excavation in which bubbles injected by a foaming agent foaming method or a direct injection method are mixed in order to reduce the cutting resistance between the face of the face and the cutter bit, or to enhance the fluidity and water stopping property against excavation shear. In the discharge facility, where the shear is in communication with the front of the partition behind the partition of the shield machine, vibration, agitation and compression are applied along with the pressure reduction in the pressure reducing device,
When decompressing while compressing, the volume increases in proportion to the pressure, and when the interfacial tension of the bubble is exceeded, the bubble is broken and the bubble is degassed from the mixed bubbles, and the degassed excavated scrap. A method for degassing a mixture of bubbles, which is discharged by the discharge facility under atmospheric pressure behind the partition wall while maintaining a predetermined pressure in front of the partition wall. 2. Excavation in which air bubbles injected by a foaming agent foaming method or a direct injection method are mixed in order to reduce cutting resistance between the face of the face and the cutter bit, or to improve fluidity and water stopping property against excavation shear. The shear is discharged by the discharge facility behind the partition wall of the shield machine, and the discharged bubble-mixed shear is subjected to vibration, agitation, and compression as the pressure is reduced in the pressure reducing device, and when the pressure is reduced while compressing, the volume is reduced. Is increased in proportion to the pressure, and when the interfacial tension of the bubbles is exceeded, the bubbles are broken and the bubbles are degassed from the bubbles.