JP2898420B2 - Muddy water treatment system of mud pressurized shield method and consolidated clay separation mechanism for use in it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muddy water treatment system of a muddy pressurized shield method in tunnel construction, and more particularly to an efficient muddy water treatment by separating solidified clay contained in muddy water. The present invention relates to a sewage treatment system which can be used and a consolidated clay separation mechanism effective therefor.

[0002]

2. Description of the Related Art A muddy pressurized shield method used in tunnel construction is a method of applying a predetermined pressure to muddy water and circulating the muddy water to stabilize the face and carry out fluid transport of excavated soil. Excavating mechanism to excavate, stirring mechanism to agitate excavated soil, mud feeding and discharging mechanism for circulating mud, control mechanism to apply constant pressure to mud, mud treating mechanism to separate excavated and transported mud, It consists of a mud conditioner for sending muddy water.

[0003] The muddy water treatment in the muddy water pressurized shield method includes a primary treatment for separating gravels and sand by a physical classification method, a method for once flocculating fine silt, clay, colloid and the like with a flocculant or the like. After being dehydrated by a method such as compression and the like, a secondary treatment for separating mud and moisture and a tertiary treatment for pH adjustment are generally performed.

Conventionally, as a primary treatment mechanism for separating solids contained in the muddy water, the muddy water is allowed to flow on a net attached to a main body to cause the solids to remain on the net and to vibrate the net. A vibrating sieve is used to shake off muddy water adhering to the water.

[0005] However, the above-mentioned conventional separator works well for solids such as sand and gravel, but solids which dissolve in water or are deformed by external force like consolidated clay. Has the disadvantage that it does not work effectively.
That is, there is a disadvantage that the mesh of the separator is clogged by deformation due to the vibration of the mesh of the separator or collision with gravel, or the compacted clay cannot be separated efficiently because the mesh is fragmented and escapes from the mesh.

Therefore, when excavating a ground with a lot of clay, it is necessary to frequently replace this net, and it is necessary to arrange a monitoring worker for this purpose.

Further, in the conventional muddy water treatment system using the above separator as a primary treatment mechanism, a large amount of silt dissolved from the consolidated clay by the vibration of the separator is delivered to the secondary treatment mechanism. There has been a drawback that the number of times of the treatment is increased or the amount of chemicals such as a coagulant is increased, which affects the propulsion efficiency.

[0008]

The present inventors have made intensive studies to solve the above-mentioned drawbacks, and as a result, incorporated a net conveyor in the casing and removed the adhering moisture of the consolidated clay on the upper part of the net conveyor. By providing a blower means for performing the above, it is possible to provide a new consolidated clay separation mechanism capable of separating the consolidated clay, and the above-described consolidated clay separation in front of the primary treatment mechanism of the conventional muddy water treatment system By arranging the mechanism, a new muddy water treatment system that can deliver muddy water from which the consolidated clay was removed, which could not be processed by the conventional primary treatment mechanism, to the primary treatment mechanism can be obtained. The present invention has been reached.

Accordingly, a first object of the present invention is to provide a muddy water treatment system for a muddy pressurized shield method which can easily treat muddy water even when excavating a clay-rich formation. It is in. A second object of the present invention is to provide a consolidated clay separation mechanism capable of easily separating consolidated clay contained in muddy water.

[0010]

SUMMARY OF THE INVENTION The above objects of the present invention are as follows. Sludge (1) generated by excavation is separated from mud by at least a primary treatment mechanism (2) and a secondary treatment mechanism (3). In the muddy water treatment system of the muddy pressurized shield method in which the separated water is recirculated to the excavator (4) after being separated into water , at least a stage preceding the primary processing mechanism (2) is provided.
And a muddy water treatment system of a muddy pressurized shield method characterized by disposing a consolidated clay separation mechanism (5) , which comprises a net conveyor and a blowing means, and at least incliningly load the inside of the exterior (7). Net conveyor (6) consisting of a broken net and a chain, a muddy water inlet (8) opening to the exterior (7) above the lower end of the net conveyor (6), and an exterior below the lower end of the net conveyor (6) (7), a muddy water discharge opening (9), an air blowing means (10) opening to an exterior (7) above an intermediate portion of the net conveyor (6), and an exterior (7) below an upper end of the net conveyor (6). ), Wherein the sludge water (1) is supplied from the sludge water inlet (8) while the net conveyor (6) is rotated upward from below. Primary treatment of mud The solidified clay (15) contained in the muddy water is allowed to flow down to the structure (2) to remain on the net conveyor (6), and the solidified clay (15) is transferred to the solidified clay discharge port (11). Blowing means (1
0) to remove adhering water adhering to the surface of the consolidated clay (15), and then drop the consolidated clay (15) to an earth removal treatment mechanism (14). Achieved by

Hereinafter, a muddy water treatment system (hereinafter, simply referred to as a "muddy water treatment system") of the muddy water pressurized shield method of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto. Absent. FIG. 1 is a flowchart showing the muddy water treatment system of the present invention. In the figure, reference numeral (1) indicates wastewater, reference numeral (2) indicates a primary treatment mechanism, reference numeral (3) indicates a secondary treatment mechanism, reference numeral (4) indicates an excavator, and reference numeral (5) indicates a consolidated clay separation mechanism. .

The muddy water treatment system according to the present invention recirculates wastewater (1) generated by excavation to an excavator (4) via at least a primary treatment mechanism (2) and a secondary treatment mechanism (3). In the previous stage of the muddy water treatment system, a new muddy water treatment mechanism called a consolidated clay separation mechanism (5) was provided as a pretreatment for the primary treatment, whereby the consolidated clay contained in the wastewater (1) was removed. It is removed to reduce the load after the primary treatment, that is, the clogging of the net used in the primary treatment mechanism (2) with the consolidated clay and the use amount of chemicals such as the coagulant used in the secondary treatment mechanism (3). Things.

FIG. 2 is a schematic view of a consolidated clay separating mechanism used in the muddy water treatment system of the present invention. In the drawing, reference numeral (6) denotes a net conveyor, which is fixed by being inclined in the exterior (7). The net conveyor (6) can be appropriately selected from known net conveyors consisting of a net and a chain, and the mesh is large enough to allow consolidated clay contained in muddy water to remain. Need to be
Specifically, it is preferable to use one having a size of 3 to 5 mm. If it is 3 mm or less, clogging is likely to occur 10 mm
If it is above, the residual rate of the consolidated clay will be low. If the net conveyor (6) is a variable speed type, the net conveyor (6)
Since the thickness of the solidified clay remaining on the solidified clay can be adjusted, the air drying effect described below can be made effective for the particle diameter of each solidified clay.

The exterior (7) for loading the net conveyor (6) is inclined in the same manner as the net conveyor (6).
It is preferable to make the muddy water scattered in the exterior (7) flow down to a muddy water discharge port described later.

Reference numeral (8) denotes a sludge water inlet opening to the exterior (7) above the lower end of the net conveyor (6).
It is preferable to provide a cushion portion (12) as shown in the figure so that the muddy water (1) does not fall directly on the net conveyor (6). The code (9) is a net conveyor (6)
Is a muddy water outlet opening to the exterior (7) below the lower end of the.

Reference numeral (10) denotes an air blowing means which opens to the exterior (7) above the intermediate portion of the net conveyor (6). The number of the blowing means (10) is arbitrary, and two or more can be provided as shown in the figure. In addition, it is preferable to make the direction of the blowing nozzle variable so that the blowing direction can be appropriately adjusted. The shape of the blowing nozzle can be appropriately designed so that the blowing is performed as uniformly as possible over the entire width of the net conveyor, but the opening width at the nozzle tip is preferably about 30 mm. For the supply of wind to the blowing means (10),
It is preferable to use a turbo fan (not shown) capable of providing a sufficient air pressure and air volume to disperse the water adhering to the surface of the consolidated clay. Furthermore, the blowing means (10)
It is preferable to provide a heating means and a wind speed adjusting means (both are not shown) since water adhering to the consolidated clay can be efficiently scattered and dried.

Reference numeral (11) designates a consolidated clay discharge opening which opens to the exterior (7) below the upper end of the net conveyor (6), when there is a drop with a discharge processing mechanism (belt conveyor or the like) described later. It is preferable to provide a discharge pipe or curtain (13) as shown in the figure.

FIG. 3 is a schematic view showing a further preferred embodiment of the consolidated clay separating mechanism used in the present invention. The blowing means (10) in the present embodiment is a front-stage blowing nozzle (17) provided perpendicular to the net conveyor (6).
And a rear-stage blowing nozzle (18) provided at an angle in a direction opposite to the traveling direction of the net conveyor (6). The blowing nozzles (17) and (18) are blowing nozzles that can blow air uniformly over the entire width of the net conveyor (6).

Reference numeral (19) designates a water sprinkling means provided in front of the blowing nozzle (17) for removing clay having a high water content attached to the surface of the consolidated clay. The water sprinkling means (19) can be appropriately selected from known water sprinkling means, and is preferably arranged so that water can be sprinkled over the entire width of the net conveyor (6). Hereinafter, the muddy water treatment system of the present invention, in which the consolidated clay separating mechanism (5) of the present invention is arranged, will be described in detail together with the operation.

[0020]

In the present invention, the primary treatment mechanism (2) is disposed below the muddy water discharge port (9) of the consolidated clay separation mechanism (5), and the soil is discharged below the consolidated clay discharge port (11). The treatment mechanism (14) is arranged, and the sludge water (1) is supplied to the sludge water inlet (8) while rotating the net conveyor (6) from below to above.

Among the muddy water (1) supplied from the muddy water inlet (8), mud having a small water content or a small particle diameter passes through a net conveyor (6) and passes through a muddy water discharge port (9) to a primary treatment mechanism. Consolidated clay with a large particle size while flowing down to (2) (15)
Remain on the net conveyor (6).

The solidified clay (15) remaining on the net conveyor (6) is washed by a watering means (19) provided as necessary, and the high-moisture content clay attached to its surface is removed. Next, water adhering to the upper surface of the consolidated clay (15) is scattered by an air blowing nozzle (17), and then the rotational force is applied to the consolidated clay (15) by air blowing from the air blowing nozzle (18), and the side and back sides thereof are applied. Splash the water adhering to. This makes it possible to reduce the amount of water adhering to the consolidated clay to 1% or less.

The solidified clay (15) from which the surface moisture has been promptly removed as described above is transferred above the net conveyor (6), and the muddy water scattered from the solidified clay (15) is
It flows down to the muddy water discharge port (9) along the bottom surface of the exterior (7).

The consolidated clay (15) that has reached the upper end of the net conveyor (6) falls from the net conveyor (6) to the discharging mechanism (14), is delivered to a hopper or the like, and is disposed of. The muddy water that has fallen into the primary treatment mechanism (2) is recirculated to the excavator (4) after being subjected to primary treatment and secondary treatment.

The earth discharging mechanism (1) used in the present invention
As 4), a known earth discharging mechanism such as a belt conveyor can be used.

The muddy water treatment system of the present invention has been described in detail above.
Will separate not only solidified clay but also solid matter such as gravel. In the case of excavating a ground where a gravel layer and a clay layer are intricate, the muddy water (1) is supplied to the consolidated clay mechanism (5) when the clay layer is excavated, and the primary fluid is excavated when the gravel layer is excavated. A bypass path (16) may be provided so that it can be directly supplied to the processing mechanism (2).

The solidified clay separating mechanism used in the muddy water treatment system of the present invention is applicable not only to the above-described shield method in tunnel work but also to a muddy water treatment system for other civil works such as a well pipe excavation method in bridge work. Can be used.

[0028]

As described in detail above, when the muddy water treatment system using the consolidated clay separation mechanism of the present invention is employed in the muddy water pressurized shield method, the consolidation clay contained in the muddy water is removed. Since a new consolidated clay separation mechanism capable of performing the above-described operation is arranged as a pre-treatment of the primary treatment, the load after the primary treatment can be significantly reduced. Therefore, the number of times of the secondary treatment can be reduced, and the wear of the mesh of the primary treatment mechanism and the number of times of washing the mesh can be reduced, so that not only the work management is facilitated, but also the clay or silt component dissolved in the muddy water can be reduced. , The adjustment of specific gravity and viscosity becomes easy.
Further, there is an advantage that the amount of chemicals used in the tertiary treatment can be reduced.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a muddy water treatment system of the present invention.

FIG. 2 is a schematic diagram of a consolidated clay separation mechanism used in the muddy water treatment system of the present invention.

FIG. 3 is a schematic view showing another embodiment of the united clay molecular mechanism used in the muddy water treatment system of the present invention.

[Explanation of symbols]

 1 ··· Wastewater 2 ··· Primary treatment mechanism 3 ··· Secondary treatment mechanism 4 ··· Excavator 5 ··· Consolidated clay separation mechanism 6 ··· Net conveyor 7 · · · · Exterior 8 · · · muddy water inlet 9 · · · muddy water outlet 10 · · · blowing means 11 · · · solidified clay outlet 12 · · cushion 13 · · · curtain 14 · · ·・ Ejection treatment mechanism 15 ・ ・ ・ Consolidated clay 16 ・ ・ ・ Bypass path 17 ・ ・ ・ Blower nozzle at the front stage 18 ・ ・ ・ Blower nozzle at the rear stage 19 ・ ・ ・ Spraying means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-114360 (JP, A) JP-A-2-24481 (JP, A) JP-A-2-171430 (JP, A) (58) Investigation Field (Int.Cl. ⁶ , DB name) E21D 9/06 301

Claims (4)

(57) [Claims] An excavated mud (1) generated by excavation is separated into mud and moisture through at least a primary treatment mechanism (2) and a secondary treatment mechanism (3), and the separated moisture is excavated. In the muddy water treatment system of the muddy pressure shield method recirculated to the machine (4) , at least a net conveyor and a blowing means are provided at a stage preceding the primary treatment mechanism (2).
Comprising, discharging muddy water (1) mud treatment system mud pressurized shield method, characterized in that a consolidated clay separation mechanism (5) capable of removing caking clay. 2. A net conveyor (6) comprising a net and a chain which is loaded at least in a slanted manner in the exterior (7), and a muddy water inlet opening to the exterior (7) above the lower end of the net conveyor (6). (8) a muddy water discharge port (9) opening to the exterior (7) below the lower end of the net conveyor (6), and a blowing means (10) opening to the exterior (7) above the middle part of the net conveyor (6). ) And a mechanism having a consolidated clay discharge port (11) opening in an exterior (7) below the upper end of the net conveyor (6), wherein the net conveyor (6) is rotated upward from below. The muddy water (1) is supplied from the muddy water inlet (8), and the muddy water is caused to flow down to the primary treatment mechanism (2), and the consolidated clay (15) contained in the muddy water is left on the net conveyor (6). The consolidated clay (15) The consolidation clay (1) is transferred by the blowing means (10) while being transferred to the soil discharge port (11).
5) A solidified clay separating mechanism characterized by removing water adhering to the surface and then dropping the solidified clay (15) to an earth removal treatment mechanism (14). 3. A front-stage blowing nozzle (17) provided with a blowing means (10) perpendicular to the net conveyor (6).
And a rear-stage blower nozzle (18) provided at an angle in a direction opposite to the traveling direction of the net conveyor (6), and the blower nozzles (17) and (18) have an opening width of about 30 mm. The consolidated clay separating mechanism according to claim 2, wherein the blower nozzle has a structure capable of uniformly blowing air over the entire width of the net conveyor (6). 4. The consolidated clay separating mechanism according to claim 2, wherein a water sprinkling means (19) is provided in front of the blowing means (10).