JPH0244998B2 - MYAKUDOHONPUNOKYUNYU * HAIDOKEIMYAKUDOKEIGENHOHO - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) This invention is mainly used in earth pressure shield construction methods and push pipe construction methods, in which a pulsating pump is used to minimize earth pressure fluctuations on the face suction side as well as on the pump discharge side. This paper relates to a method for reducing pulsation in the suction and excretion systems.

(Prior art) Conventionally, when a constant earth pressure is maintained at the face and an intermittent operation earth suction pump, that is, a pulsating pump, is propelled at a constant speed by an elastic extensible cylinder in a pipe system connected to an excavator, a constant flow of earth and sand is generated. It is necessary to remove soil, but if this is carried out using the intermittent suction and removal pulsating pump described above, the pressure fluctuations not only on the suction face side but also on the suction and discharge side will rapidly decrease and rise rapidly. There were major drawbacks such as the inability to maintain stability of soil water pressure in the ground, and the flow of soil in the pipeline system becoming uneven, sometimes damaging the pipeline, and causing deformation and meandering. .

(Technical problem) Therefore, in this invention, by synchronizing with the pulsating pump and forcibly sucking and discharging the face earth and sand,
The technical challenge is to reduce the suction pressure at the face and the pulsation of the earth removal system.

(Technical Means) This invention was made to solve the above technical problem, and the present invention has been made in order to solve the above-mentioned technical problem. By operating a balancer, the suction and soil removal are alternately carried out on the suction and soil discharge sides of the soil discharge pipe system, thereby reducing pressure fluctuations on the suction and soil discharge sides of the soil discharge pipe. The present invention provides a method for reducing pulsation in a suction and discharge system of a pulsating pump.

Embodiment 1 First, in FIG. 1 of the drawings, two pulsating pumps 3a and 3b are installed in the earth removal pipe 2 equipped with the excavator 1 at the tip.
Two valves V ₁ and V ₂ are respectively connected and interposed at the rear ends of the pulsating pumps 3a and 3b. Also, it branches from the soil discharge pipe 2 slightly in front of the pulsating pump 3a through the suction side port 5a, and connects to the valve V ₂
A bypass pipe line 5 is provided in the earth discharge pipe line 2 a little behind the earth discharge pipe line 2 and is connected to the earth discharge pipe line 2 through an earth discharge side port 5b.

In the bypass pipe 5, a diaphragm 7 moves back and forth to the left and right by operating the cylinder 8, and bellows 6a and 6b on both sides alternately extend and contract to apply appropriate force on both sides of the diaphragm 7 as necessary. A double-acting forced balancer 6 is installed, which has the function of alternately performing forced earth accumulation and earth removal by changing the volume. Although the pulsating pumps 3a and 3b are not shown in the drawings, they are forcibly expanded and contracted as appropriate by operation using operating cylinders. 4a and 4b are pressure gauges.

Next, the operating state of the present invention will be explained with reference to the operating process diagrams of FIGS. 3A to 3F.

First, in the state shown in FIG. 3A, the valve V ₂ is closed, the valve V ₁ is beginning to close, the pulsating pump 3a is contracted, the pulsating pump 3b is in the extended state, and the double-acting force balancer 6 has the diaphragm 7 in the direction of the arrow. The bellows 6a extends and the bellows 6b contracts.
Therefore, it was continuously sucked in from the excavator 1 side10
/sec of earth and sand is sucked into the bypass pipe 5 as shown by the arrow and stored in the bellows 6a, and at the same time, the earth and sand in the bellows 6b flows to the discharge side of the earth removal pipe 2 as shown by the arrow at a flow rate of 10/sec. The soil will be removed one after another. Next, as shown in Fig. 3B, the valve V ₂ begins to open and has finished opening at the same time as the valve V ₁ finishes closing, and the bellows 6a of the double-acting forced balancer 6 is fully extended, and the allowable amount is reached. 50/sec of earth and sand is stored, and on the other hand, 10/sec of earth and sand is discharged from the bellows 6b side. Next, from the above, the pulsating pump 3a
expands, the pulsating pump 3b contracts, and the valve _V1 slides in the right direction of the arrow, that is, at this time.
The state shown in FIG. 3C is reached in which 60 pieces of earth and sand are transported in the right arrow direction by the pulsating pumps 3a and 3b. And in this case, of the 60 sediments being pumped
50 is fed into the bypass pipe as shown by the arrow and stored in the bellows 6b side of the double-acting forced balancer 6, and the remaining 10l is discharged to the earth removal side of the earth removal pipe 2 as shown by the arrow. go. In this case, by moving the partition plate 7 in the left direction of the arrow, 50 pieces of earth and sand that had been stored on the bellows 6a side are transferred to 10/10 pieces of earth and sand that has been sucked in from the excavator 1 side.
sec as shown by the arrow to form 60 and fill the pulsating pump 3a side. Next, from the above state, as the excavator 1 excavates, earth and sand at a rate of 10/sec are sent toward the bypass pipe 5 as shown by the arrow, and sucked into the bellows 6a of the double-acting forced balancer 6, and the valve
The state shown in Figure 3 D is reached where V ₂ begins to close. In this case, the earth and sand from the bellows 6a is continuously discharged at a rate of 10/sec toward the earth discharge side of the earth discharge pipe 2 as shown by the arrow. Then, at the same time as valve V ₂ closes, valve V ₁ begins to open and reaches the state shown in FIG. 3 (E) in which it is completely open. In this case, by moving the partition plate 7 in the direction of the arrow, 10/sec of suctioned sediment from the excavator 1 is sent into the bypass pipe 5 as shown by the arrow and sucked into the bellows 6a, and at the same time the sediment on the bellow 6b side is moved in the direction of the arrow. The soil is discharged at a rate of 10/sec to the soil discharge side of the soil discharge pipe 2 as shown in the figure. Next, from the above state, the pulsating pump 3a contracts, the pulsating pump 3a expands, and the valve
V ₁ slides in the direction of the arrow in the required time, and the partition plate 7 slides in the right direction of the arrow to further release the bellows 6a.
The state shown in FIG. 3 is reached, in which the bellows 6b extends and the bellows 6b contracts.
Then, the state returns to the state shown in Fig. 3A, and a one-cycle process is performed, which is repeated.

Therefore, as can be seen in each step of the above-mentioned cycle, both the suction side and the soil discharge side of the earth removal pipe 2 are constantly sucking and removing earth at a constant rate (10/sec), and the pressure fluctuates on each side. The reduction will be resolved.

Embodiment 2 In the drawing shown in Fig. 2, the double-acting forced balancer 6
is installed in the bypass pipe 5 near the suction side port 5a,
The side of the bypass pipe 5 extending from the bellows 6b is made into a thin tube and communicates with the soil discharge side of the soil discharge pipe 2 through the soil discharge side port 5b through the storage portion 5', and a diaphragm is connected to the soil discharge side port 5b. A vibrating diaphragm 9 of the type shown in FIG.

In this case, the operation of the bellows 6b side of the double-acting forced balancer 6 is to suck in and discharge earth by the vibrating diaphragm 9 which operates using the liquid 10 as a medium.
The operating process and operating state are completely the same as in the first embodiment, and the illustration and explanation of the operating process will be omitted.

(Effects) As described above, this invention operates the double-acting forced balancer of the bypass pipe to remove the earth and sand that are continuously sucked into the suction side of the earth removal pipe from the excavator and the earth and sand that is pumped to the same earth removal side. This system is capable of alternately suctioning and removing soil on the suction side and soil discharge side of the soil removal pipe system, and reduces pressure fluctuations on the suction and soil discharge sides of the soil discharge pipe system. It has the excellent effect of minimizing the suction pressure at the face and the pulsation of the earth removal system by forcibly sucking and removing earth and sand from the face. It is extremely beneficial as it can significantly contribute to maintaining stability and reducing pressure fluctuations on the soil discharge side, and can maintain stability of soil water pressure in the ground.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of an embodiment of an apparatus for carrying out the present invention, FIG. 2 is a longitudinal sectional side view of another embodiment of the same,
3A to 3F are operation process diagrams according to the embodiment of FIG. 1. 1... Excavation machine, 2... Earth removal pipe, 3a, 3b...
... Pulsating pump, 4a, 4b... Pressure gauge, 5... Bypass line, 5... Reservoir, 5a... Suction side port,
5b...Discharge side port, 6...Double acting forced balancer,
6a, 6b... Bellows, 7... Diaphragm, 8... Cylinder, 9... Vibration diaphragm, 10... Liquid, V ₁ ,
V ₂ ...Valve.

Claims (1)

[Claims] 1 Sediment that is continuously sucked in from the excavator through the suction side of the earth removal pipe system and earth and sand that is pumped to the same earth removal side is transferred to the suction side of the earth removal pipe system and the earth and sand by operating the double-acting forced balancer of the bypass pipe line. Pulsation reduction in the suction and soil removal system of a pulsating pump characterized by alternately suctioning soil accumulation and soil discharge on the soil side, and reducing pressure fluctuations on the suction side and soil discharge side of the soil discharge pipe, respectively. Method.