JPH09151481A - Filter for filtrating rubbish in discharge sediment and sediment discharge method using the filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically discharge sediment by using a filter capable of treating the sediment mechanically and quickly without any need of resorting to labor. SOLUTION: A filter is divided into a filtration chamber 22 and a strainer retreating chamber 23 by use of a division 24, and many communication holes 28 are drilled through the division 24. Also, comb tooth type strainers slidable in the filtration chamber 22 and the strainer retreating chamber 23 on the operation of a power device are inserted in the communication holes 28. As a result, rubbish clamped with the strainers at a filtrating process are automatically separated therefrom with the division 24 at the time of the retreat of the strainers. A plurality of the strainers so formed are prepared, and when one such filter is operating to filtrate sediment, another filter is made to perform a backwashing operation so as to carry rubbish accumulated in the filtration chamber 22 to a filled ground on pressurized water from a pump, respectively by selecting a valve operation. A plurality of the filters are alternately made to repeatedly perform filtration and backwashing operations for automatically discharging sediment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strainer which is installed in a sludge pipe line for transporting soil and sand to a landfill in a slurry state and filters debris mixed in the soil and sand, in particular, a strainer. The present invention relates to a strainer capable of mechanically removing filtered debris without depending on the amount of people and a method of pumping mud with the strainer.

[0002]

2. Description of the Related Art It has long been practiced to make a slurry of earth and sand and convey it to a landfill site by a pump for mud disposal at the time of landfilling a coast or a river. Fig. 7 shows how landfill works are performed by injecting jet water from the pumping mud to the sediment carried by the earth carrier to make it into a slurry, and then transporting the sediment to the landfill site using the pump and pump line. It represents. Next, Fig. 8 shows the conventional mud piping line.
Shown in

Jet water from the above-mentioned sludge work boat is poured into the earth and sand carried by the earth and sand carrier 1 to form a slurry, and the earth and sand 2 made into the slurry is sucked by a mud suction pump 3 to a suction pipe 4 Is sucked from the mud suction port 5 and is transported to the landfill site through the mud discharge pipe 6. The mud suction pipes are arranged in parallel,
Two mud suction lines are formed, and a first strainer 40 ₁ and a second strainer 40 ₂ are installed in the middle of the branch pipes 4 ₁ and 4 ₂ that are the mud suction lines, respectively. Strainer 4 on each strainer
1, a differential pressure gauge 11 for measuring the differential pressure between both sides of the strainer and a debris discharge lid 42 are installed, and strainers 40 ₁ , 40 ₂
Gate valves 43 ₁ and 4 are provided at the inlet and outlet branch pipes 4 ₁ and 4 _2.
3 ₂ , 44 ₁ and 44 ₂ are provided, and the mud suction line is switched by operating these sluice valves. As for the shape of the strainer 41, a comb-shaped 41 ₁ and a lattice-shaped 41 ₂ shown in FIGS. 9A and 9B are used.

In FIG. 8 (a), the sluice valves 43 ₁ and 44 ₁ are opened and 43 ₂ and 44 ₂ are closed to operate the first strainer 40 ₁ .
The state where the second strainer 40 ₂ is on standby is shown. The earth and sand absorbed from the mud suction port 5 flows from the branch pipe 4 ₁ to the first strainer 40 ₁
Then, debris (concrete pieces, stone blocks, wood pieces, etc.) 13 of a size that damages the sludge pump 3 is blocked by the strainer 41 and accumulated in the first strainer 40 ₁ . Predetermined time (usually 1
When operated for 0 to 30 minutes), the accumulated debris 13 closes the muddy water passage, and a large negative pressure is generated on the suction side of the lift pump 3 to make it impossible to lift the mud. Therefore, in order to prevent such a situation, the pressure difference between the front and rear of the strainer 41 is measured by the differential pressure gauge 11
Since it is possible to know the accumulation state of the debris 13 by measuring with, when the allowable differential pressure of the differential pressure gauge 11 reaches the limit value,
Figure partition valve 43 _1, 44 ₁ which has been in the open as well as the gate valve 43 _2, 44 ₂ to the open remotely switched to the closed 8
In the state of (b), the second strainer 40 ₂ that has been on standby performs filtration. During the switching operation of the sluice valve, if suction of the pump for pumping mud becomes unstable, the valve 14 of the seawater suction pipe 12 is opened as necessary to suck seawater. And
While the second strainer 40 ₂ is operating, the debris discharging lid 42 of the first strainer 40 ₁ is opened to scrape out the debris 13 accumulated manually or remove the debris clogged in the strainer 41. Then put it in the standby state for the next operation. In this way, the landfill work is continuously performed by switching the mud suction line and repeating these operations.

[0005]

In the above-mentioned conventional strainer, since the work of opening and closing the lid 42 for discharging debris, scraping the accumulated debris, cleaning the strainer, etc. relies on human labor, labor and labor can be saved. There was a problem. The present invention improves the above-mentioned conventional strainer, and provides a strainer capable of mechanically and swiftly performing removal of debris accumulated in the strainer and debris clogging the strainer without relying on human power. Furthermore, the present invention is intended for a method of lifting mud of earth and sand using the strainer.

[0006]

The strainer of the present invention is a strainer for filtering debris in lifted mud, and the strainer 20 has a filter chamber 22 and a strainer retreat chamber 23 via a partition plate 24. And a comb tooth-shaped strainer 27 which is inserted into a through hole 28 formed in the partition plate 24 and slides in the filtration chamber 22 and the strainer retreat chamber 23 by a power unit. According to the method for lifting mud of the present invention, a plurality of the above-mentioned strainers are prepared, and when one strainer 20 ₁ starts filtering rubble in the sludge sediment, the strainer 27 of the other strainer 20 ₂ is started.
Is moved to automatically remove the rubble clogged in the strainer, and the strainer 20 ₂ is backwashed to lift the mud.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a vertical sectional front view of a strainer 20 according to the present invention, and FIG. 2 shows a vertical sectional side view. 2
The reference numeral 1 designates a machine frame, in which a filtration chamber 22 connected to the lifting mud pipeline is installed. Reference numeral 23 is a strainer evacuation chamber, and the filtration chamber 22 and the strainer evacuation chamber 23 are connected to each other with a partition plate 24 interposed therebetween. A strainer main body 25 is vertically guided in the strainer retreat chamber 23 by a guide bar 26 standing upright in the retreat chamber, and the strainer main body has a plurality of strainers in a comb tooth shape and the partition plate. 24
It is attached by inserting the through hole 28 formed in the. Hydraulic cylinders 29, 29 are installed in the machine frame 21, and piston rods 30, 30 of the cylinders are connected to a strainer body 25. By driving the hydraulic cylinders 29, 29, the strainer 27 filters the strainer 20. It moves up and down between the chamber 22 and the strainer retreat chamber 23. The distance between the strainers 27 is determined by the protection of the pump for pumping mud and the like.

Reference numeral 31 is a support for the filtration chamber 22, and 32 is a maintenance window. The strainer evacuation chamber 23 is provided with a water supply port, and seawater or river water having a pressure slightly higher than that in the filtration chamber 22 is supplied from the water supply port 33 from a pump (not shown) as shown by arrows a and b. It is possible to prevent muddy water flowing in the filtration chamber 22 from flowing into the strainer retreat chamber 23. It is also possible to use not only a hydraulic cylinder but also an air cylinder or other electric motor as the drive means of the strainer. As for the positional relationship between the filtration chamber 22 and the strainer retreat chamber 23, the illustrated one is arranged in the vertical direction, but it may be arranged in the horizontal direction. In that case, the strainer main body 25 is driven in the horizontal direction. .

FIG. 3A shows a state where the piston rods 30, 30 of the hydraulic cylinders 29, 29 are contracted to lower the strainer 27 into the filtration chamber 22 to close the strainer, and the debris 13 is sandwiched between the strainers. There is. When the hydraulic cylinders 29, 29 are driven in this state to extend the piston rods 30, 30 and raise the strainer 27 into the retreat chamber 23, the debris 13 sandwiched between the strainers 27 collides with the partition plate 24. Then, as shown in FIG. 3B, the strainer 27 is automatically disengaged. In addition, the partition plate 2
When the debris removing projection 34 is provided on the surface of No. 4 as shown in FIG. 4, the debris removing action is performed more efficiently.

Next, a method of pumping mud using the strainer 20 will be described with reference to FIG. Soil and sand 2 made into a slurry by pouring jet water from a mud work boat into the earth and sand carried by the earth carrier 1 is sucked from the mud suction port 5 of the mud suction pipe 4 by the mud pump 3 and discharged mud Although not being conveyed to the landfill through the tube 6, the吸泥pipe 4 is branched at the branch pipe 4 _1, 4 ₂ so as to constitute a吸泥lines of two systems, branch pipes 4 ₁ It is connected to the inlet of the first strainer 20 ₁ via a sluice valve 7 ₁ , and the first strainer 20 ₁ is connected to the sluice valve 7 ₁ in parallel with a sluice valve 7 ₂ to discharge the sludge pipe 6 It is connected to the.
The outlet side of the strainer 20 ₁ and the sluice valves 8 ₁ and 8 ₂ are connected in parallel, and the sluice valve 8 ₁ is connected to the suction side of the lift pump 3 and the lift pump 3 The discharge side is connected to the gate valve 8 ₂ .

[0011] branch pipe 4 ₂ second漉器via the gate valve 9 ₂ 2
0 ₂ on the outlet side and are connected, the outlet side of the漉器20 ₂ is connected to the Haidorokan 6 via the gate valve 9 ₁ connected in parallel to the gate valve 9 _2. The inlet side of the second strainer 20 ₂ is connected in parallel with the sluice valves 10 ₁ and 10 ₂ , and the sluice valve 10 ₁
Is connected to the discharge side of the sludge pump 3, and the gate valve 10
₂ is connected to the suction side of the lift pump 3.

FIG. 5A shows a state in which the strainer 20 ₁ is performing a filtering operation. A sluice valve 7 is used in this pumping line.
₁ , 8 ₁ , 9 ₁ , 10 ₁ open, gate valves 7 ₂ , 8 ₂ , 9 ₂ , 10 ₂
Is closed and the pump 3 is operating. Therefore, the sediment 2 is sucked from the mud suction port 5 through the branch pipe 4 ₁ and the sluice valve 7 ₁ into the filtration chamber 22 of the _first strainer 20 ₁ , and the strainer 27 removes the lift pump 3 mixed with the sediment. The size of the debris 13 that is damaged is filtered. The muddy water that has passed through the strainer 27 passes from the sluice valve 8 ₁ to the sluice pump 3 to the sluice valve 10 ₁
To the second strainer 20 ₂ . In the second strainer 20 _2, the strainer 27 is pulled up into the strainer evacuation chamber 23, and the debris that damages the sludge pump accumulated in the strainer 20 ₂ is backwashed and the sluice valve 9 ₁ , It is automatically transported to the landfill via the sludge pipe 6.

When the debris is filtered by the strainer 27 of the _first strainer 20 ₁ and the allowable differential pressure of the differential pressure gauge 11 installed in the strainer reaches the limit value, it is closed until now as shown in FIG. 5 (b). The sluice valves 7 ₂ , 8 ₂ , 9 ₂ and 10 _{2 that} were open are opened, and the sluice valves 7 ₁ , 8 ₁ , 9 ₁ and 10 ₁ that were open are closed on the contrary, and the hydraulic cylinder 29 drives the first Strainer 20
The strainer 27 of _{No. 1} is pushed up from the filtration chamber 22 into the strainer retreat chamber 23. At this time, the debris sandwiched by the strainer 27 is automatically removed from the strainer 27 by the partition plate 24. At the same time, the strainer 27 of the _second strainer 20 ₂ descends from the strainer retreat chamber 23 into the filtration chamber 22 and the filtration in the _second strainer 20 ₂ is started. The rubble 1 pressure water from Agedoro pump 3 was deposited on the first漉器20 ₁ inflow first漉器20 ₁ to the gate valve 8 ₂
3 is backwashed and automatically conveyed to the landfill through the sluice valve 7 ₂ and the mud discharge pipe 6. After that, by repeating the above-mentioned operation, the sludge work is continuously performed. During the switching operation of the sluice valve, when suction of the sludge pump 3 becomes unstable, the valve 14 of the seawater suction pipe 12 is opened to suck seawater as needed.

As shown in FIG. 6, the sludge pump 3 and the sludge pipe 6
The bypass line 16 is piped through the sluice valve 15 between the backwash side sluice valve 8 ₂ and the backwash side sluice valve 8 _{2 of} the first strainer 20 ₁ .
When 7 ₂ is closed and the sluice valve 15 of the bypass line 16 is opened, the pumped mud water from the pumped mud pump 3 can be sent to the mud discharge pipe 6 without passing through the first strainer 20 ₁ . Similarly, when the backwash sluice valves 10 ₁ and 9 ₁ of the second strainer 20 ₂ are closed and the sluice valve 15 is opened, the muddy water from the pumped mud pump 3 is sent to the sludge pipe 6 without passing through the second strainer 20 _2. As a result, the usage time of the strainers 20 ₁ and 20 ₂ can be reduced, wear due to muddy water can be suppressed, and the life of the strainers can be extended.

[0015]

EFFECTS OF THE INVENTION By adopting the strainer and the sludge method according to the present invention, removal of debris accumulated in the strainer and clogging of the strainer can be automatically carried out by a machine without manual labor, so that landfill work can be performed. It is extremely effective in saving labor, labor and improving safety.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a strainer according to the present invention.

FIG. 2 is a vertical sectional side view of the strainer.

FIG. 3 is an operation explanatory view of the strainer, and FIG. 3A is a state in which the strainer is filtering. The figure (b) shows the state when the strainer is retracted.

FIG. 4 is a partially enlarged view of another embodiment of the partition plate.

FIG. 5 is an explanatory diagram of a method of pumping mud using a strainer of the present invention, in which (a) is a state in which filtration is performed by the first strainer and backwashing is performed by the second strainer. The figure (b) shows a state in which backwashing is performed by the first strainer and filtration is performed by the second strainer.

FIG. 6 is an explanatory view of another embodiment of the method for pumping mud using the strainer of the present invention.

FIG. 7 is an explanatory diagram of landfill work.

FIG. 8 is an explanatory diagram of a conventional mud pumping method,
(A) In the figure, the first strainer is in operation and the second strainer is in a rest state. (B) The figure shows a state in which the first strainer is at rest and the second strainer is in operation.

9A and 9B are known strainer strainers, wherein FIG. 9A shows a comb-shaped strainer, and FIG. 9B shows a lattice-shaped strainer.

[Explanation of symbols]

1 Dounsen 2 Sediment 3 Agedoro pump 4吸泥pipe 4 _first branch pipe 4 ₂ branch pipe 5吸泥port 6 Haidorokan 7 ₁ gate valve 7 ₂ sluice valve 8 ₁ sluice valve 8 ₂ sluice valve 9 ₁ gate valve 9 ₂ gate valve 10 ₁ gate valve 10 ₂ gate valve 11 differential pressure gauge 12 seawater suction pipe 13 rubble 14 valve 15 gate valve 16 bypass line 20 ₁ 1st strainer 20 ₂ 2nd strainer 21 machine frame 22 filtration room 23 strainer evacuation Chamber 24 Partition plate 25 Strainer body 26 Guide bar 27 Strainer 28 Through hole 29 Hydraulic cylinder 30 Piston rod 31 Support 32 Maintenance window 33 Water inlet 34 Debris removal protrusion 40 ₁ 1st shaker 40 ₂ 2nd shaker 41 Strainer 42 Debris discharge lid 43 ₁ Gate valve 43 ₂ Gate valve 44 ₁ Gate valve 44 ₂ Gate valve

Claims (6)

[Claims] 1. A strainer for filtering debris in lifted mud, which comprises a filter chamber (22) and a strainer evacuation chamber (23) via a partition plate (24). , A comb tooth-shaped strainer (27) which is inserted into a through hole 28 formed in the partition plate (24) and slides in the filtration chamber (22) and the strainer evacuation chamber (23) by a power unit is provided. Strainer characterized by that. 2. The strainer according to claim 1, wherein the strainer (27) according to claim 1 is driven by a hydraulic or pneumatic cylinder. 3. A projection (34) for removing debris on a partition plate (24).
The strainer according to claim 1, wherein the strainer is provided. 4. A plurality of strainers according to claim 1 or claim 3 are prepared, and when one strainer (20 ₁ ) starts filtering debris in the lifted mud soil, the other strainer (20 ₂ ). The method for lifting soil and sand, wherein the strainer (27) is moved to automatically remove the debris clogged in the strainer, and the filter (20 ₂ ) is backwashed to lift the mud. . 5. The method of lifting mud according to claim 4,
During the filtration, the strainer (27) measures the pressure difference between the two sides of the strainer (27), and when the allowable pressure difference reaches a limit value, the strainer (20 ₂ ) that was in the backwash state is put into the filtration state, and again. A method of pumping earth and sand, characterized in that the agitator (20 ₁ ) which is in accordance with the above is switched to a backwashing state, and such operation is repeated to continuously pump mud. 6. The method for pumping mud and sand according to claim 4 or claim 5, wherein when the backwashing of the strainer (20 ₂ ) backwashing is completed, the strainer (20 ₁ ) filtering The method of pumping earth and sand, which comprises transporting the muddy water of 1. to the destination without passing through the strainer (20 ₂ ).