JP4369563B2 - Mud dewatering method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for dewatering water-containing residual soil (referred to herein as mud soil) such as excavated soil generated in connection with open press-fitting caisson work or the like.
[0002]
[Prior art]
The excavated soil generated in connection with the open press-fitting caisson construction has a high water content, so it is inconvenient to carry it out directly with a dump truck. For this reason, conventionally, (1) a method in which the excavated mud is left in a depression near the construction site and dehydrated, (2) a method in which the excavated mud is stored in a tank and kneaded by adding an improving agent, etc., ▲ (3) It has been generally carried out by storing in a mesh tank and dehydrating by natural water permeation, etc. and then carrying it out by a dump truck or using it for backfilling.
[0003]
[Problems to be solved by the invention]
In order to carry out the conventional method (1) described above, it is an essential condition that there is a large place where mud is deposited close to the construction site. However, it takes a long time for dehydration and depends on the weather. In particular, it is disadvantageous that dehydration is impossible in rainy weather. In the method (2), there is a disadvantage that the cost is increased by the amount of kneading in addition to the need for an improving agent. The method (3) has the merit that it can be applied as long as it can secure a place to install the mesh tank in close proximity to the excavation work site that moves one after another. The use of the mesh tank is compared to the method (1), There is a merit not to take a large space for temporary sedimentation of mud, but there is a disadvantage that it takes too much time to dewater because it is natural water permeability through the mesh. For example, dehydration using a mesh tank with a capacity of about 27m ³ requires more than half a day, the area occupied by the mesh tank is too long, and depending on the construction site situation, it must be carried out even with mud. End up.
[0004]
Considering the site of the open press-fitting caisson construction in Japan, it is appropriate to adopt the above method (3) because of the place restrictions for mud disposal. However, as described above, the method (3) has a drawback that it takes too much time for dehydration.
[0005]
In view of the above, an object of the present invention is to clarify a method and an apparatus for dewatering mud that can significantly reduce the time for dewatering mud using a conventional mesh tank.
[0006]
[Means for Solving the Problems]
The mud dewatering method according to the present invention is a box-shaped tank whose upper side is open, and the bottom or the three sides of the tank in which the mud is poured and deposited are surrounded by a mesh. A suction pipe configured by connecting hole pipes is arranged, and the suction pipe is connected to a vacuum pump arranged outside the tank, and water contained in the mud deposited in the tank is collected. wherein Ri configuration der excreted out tank is sucked by a vacuum pump through a perforated pipe,
The perforated pipe surrounded by the mesh is housed in a space surrounded by a perforated side surface protection frame, a perforated upper surface protection plate, and a tank wall / bottom surface. and wherein the spread infarction Metea Rukoto.
[0007]
The mud dewatering device according to the present invention is
(1) A box-shaped tank with an open top, and a perforated pipe surrounded by a mesh is connected to three or four sides of the bottom of the tank where mud is poured and deposited The suction pipe is connected to a vacuum pump arranged outside the tank, and the water contained in the mud deposited in the tank passes through the perforated pipe. is sucked by the vacuum pump Ri configuration der excreted out tank,
The perforated pipe surrounded by the mesh is housed in a space surrounded by a perforated side surface protection frame, a perforated upper surface protection plate, and a tank wall / bottom surface. laid busy Metea Rukoto,
(2) The suction pipe is configured by connecting a linear perforated pipe with an L-shaped pipe and a T-shaped pipe, and a vacuum pump is connected to the T-shaped pipe,
(3) The suction pipe is disposed over the entire bottom surface of the tank,
(4) The dehydrator according to any one of (1) to (3) is loaded on a transportation means such as a truck or a trailer,
(5) The dehydrating device according to any one of (1) to (3) is formed on a detachable body or a trailer and is towed by a towing vehicle .
Are each characterized.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail with reference to the accompanying drawings.
Hereinafter, the case where it applies to a mesh tank is mainly described.
[0009]
FIG. 1 schematically shows a mud dewatering apparatus in which the method of the present invention is implemented. The mud is thrown into the mesh tank 10 and accumulated, and the water contained in the mud settles and moves to the bottom, and is sucked out through the suction pipe 20 by the operation of the vacuum pump 30 and released to the sewer. After a certain amount of mud treatment, the vacuum pump 30 is reversely acted in the absence of mud, and water is ejected from the perforated pipe to the outside for cleaning. This washing water is put into the precipitation tank 50 by a pumping pump 70. The water located on the upper surface of the accumulated mud is sent to the precipitation tank 50 by the sweeper 40. In the sedimentation tank 50, after the fine particles due to the sedimentation are separated, the supernatant liquid is sent to the muddy water treatment facility 60 and further purified, and then discharged into the sewer.
[0010]
A plurality of mesh tanks 10, precipitation tanks 50, and muddy water treatment facilities 60 may be arranged continuously or in parallel. Moreover, it is good also as an aspect which discharge | releases treated water from the sedimentation tank 50 to a sewer, without going through the muddy water treatment facility 60 depending on the kind of mud. In particular, in the present invention, according to an aspect using a granular material such as silica sand, which will be described later, the pumping pump 70, the precipitation tank 50, the turbid water treatment can be performed if washing water is not generated by replacing the granular material. All of the facility 60 can be omitted.
[0011]
FIG. 2 shows details of the mesh tank 10. The mesh tank 10 basically has the same structure as that of the conventional product, that is, a box-shaped object having a bottom by a floor board material 13, and a punching metal 12 is attached to a wall frame formed by the frame 11. It has been. The entire side surface of the punching metal 12 is covered with an iron plate or other shielding plate. The outline of the size is a length of 7200 mm, a height of 1900 mm, a width of 2100 mm and a capacity of about 27 m ³ . The size and capacity are not limiting elements of the present invention.
[0012]
Although not shown in the drawings, a configuration in which a lid member such as a synthetic resin sheet is arranged on the upper surface so that the suction effect by the vacuum pump 30 can be improved is also included in the present invention.
[0013]
FIG. 3 shows details of the suction tube 20. The suction tube 20 is disposed along three or four sides of the bottom formed by the side surface 13A and the bottom surface 13B of the tank wall, and has an inner diameter of about 100 mm where a large number of holes of about 10 mmφ are disposed. A wire mesh 22 of about # 25 is wound around the perforated pipe 21 and is further filled with, for example, about No. 3 silica sand and covered with a perforated side protection frame 24, and the top surface is perforated. The upper surface protection plate 25 is provided.
[0014]
A plurality of holes are arranged in the protective frame 24 so that the water accumulated on the bottom surface moves in the lateral direction and is sucked by the perforated pipe 21. The upper surface protection plate 25 is also perforated.
[0015]
In addition, a pipe diameter, a hole diameter, a mesh diameter, the particle diameter of silica sand, etc. are not limited to the above. It is not limited to silica sand but may be a granular material effective for filtering mud.
[0016]
In the illustrated embodiment, the suction pipe 20 is disposed only at the corners of the four sides of the floor bottom. However, the suction tube 20 may be disposed on three sides excluding the punching metal coating portion, and further, the entire floor surface. It can be set as the form arrange | positioned in a snake shape or a grid | lattice form over. In addition, when arrange | positioning not only 3 sides or 4 sides but the whole floor surface, as a protective frame 24 shown in FIG. 3, for example, a perforated saddle-shaped steel material is used or the whole floor surface is covered with a perforated bottom plate. To do.
[0017]
The vacuum pump 30 does not have to be arranged in a fixed state in the mesh tank 10, but can be arranged as a separate member, connected to the T-shaped pipe as a connecting pipe. In the figure, 21A indicates an L-shaped pipe and 21B indicates a T-shaped pipe.
[0018]
Although the mesh tank has been mainly described, a normal tank may be used. A series of apparatuses from the dehydrating apparatus to the muddy water treatment facility 60 according to the present invention can be configured to be mounted on a truck or a trailer individually or as a set of facilities. The configuration may be such that only the dehydrating apparatus according to the present invention can be mounted on a truck or the like. The dehydrating apparatus according to the present invention can be configured as a detachable body structure that can be pulled by a head. Towing is performed by a towing vehicle.
[0019]
【The invention's effect】
According to the mud dewatering apparatus according to the present invention, the mud can be dehydrated within a short period of time, so that it can be efficiently transported by a truck or the like. Maintenance load that prevents clogging of the suction pipe is reduced.
[0020]
In particular, according to the present invention, since the suction pipe is laid along three or four sides of the tank bottom, there is an advantage that dewatering can be performed in a short time without causing any trouble in the loading and unloading of mud.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a mud dewatering apparatus according to the present invention. FIG. 2 is a schematic front view of a mesh tank. FIG. 3 is an enlarged sectional view of a suction pipe portion.
DESCRIPTION OF SYMBOLS 10 Mesh tank 11 Frame 12 Punching metal 13A Tank wall side surface 13B Tank bottom surface 20 Suction pipe 21 Perforated pipe 21A L-shaped pipe 21B T-shaped pipe 22 Wire mesh 23 Silica sand 24 Protection frame 25 Upper protective plate 30 Vacuum pump 40 Sweeper 50 Precipitation tank 60 Muddy water treatment facility

Claims (6)

A suction tank constructed by connecting a perforated pipe surrounded by a mesh to the three or four sides of the bottom of the tank, which is a box-shaped tank that is open at the top and is filled with mud. A pipe is provided, and the suction pipe is connected to a vacuum pump arranged outside the tank, and water contained in the mud put into the tank is accumulated by the vacuum pump through the perforated pipe. configuration der that is sucked in is discharged to the outside of the tank is,
The perforated pipe surrounded by the mesh is housed in a space surrounded by a perforated side surface protection frame, a perforated upper surface protection plate, and a tank wall / bottom surface. mud method dewatering characterized by laying infarction Metea Rukoto. A suction tank constructed by connecting a perforated pipe surrounded by a mesh to the three or four sides of the bottom of the tank, which is a box-shaped tank with an open top and is filled with mud. A pipe is provided, and the suction pipe is connected to a vacuum pump arranged outside the tank, and water contained in the mud put into the tank is accumulated by the vacuum pump through the perforated pipe. configuration der that is sucked in is discharged to the outside of the tank is,
The perforated pipe surrounded by the mesh is housed in a space surrounded by a perforated side surface protection frame, a perforated upper surface protection plate, and a tank wall / bottom surface. dehydrator mud characterized by busy Metea Rukoto kneeling. Suction tube, a linear perforated pipe is constructed by concatenating the L-shaped pipe and the T-shaped pipe, according to the T-shaped pipe, to claim 2, characterized in that the vacuum pump is connected Mud dewatering equipment.   3. The mud dewatering device according to claim 2, wherein the suction pipe is disposed over the entire bottom surface of the tank. A dewatering device according to any one of claims 2 to 4 , wherein the dewatering device is loaded on a transportation means such as a truck or a trailer. The dewatering device according to any one of claims 2 to 4 , wherein the dewatering device is formed on a desorption body or a trailer and is towed by a towing vehicle.

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