JP4110497B2 - Mixed solidification processing method and equipment in soft mud soil pipes. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention can effectively stir and mix with the solidified material in the pipe in the process of pumping soft mud with a high water content such as dredged soil, eliminating the need for special mechanical mixing equipment such as a kneading mixer. The present invention relates to a method and apparatus for mixing and solidifying soft mud in a pipe.
[0002]
[Prior art]
Conventionally, in order to effectively use dredged soil as a resource, a solidifying material is added to this and used as a ground material for landfills, for example. As a conventional method for solidifying clay, there is a method of using a large mechanical kneading mixer to uniformly knead the clay and the solidified material, or in a pneumatic feeding pipe where soft mud is pumped as a plug flow There is known a mixing method in a tube in which a solidifying material is added to and mixed with stirring. However, the former is generally processed using a dedicated ship or plant, and the equipment becomes larger and the processing cost is high, while the latter is low in processing cost, but the homogeneity of the soft mud soil after mixing is uneven. There was a problem that the variation in quality was large.
[0003]
[Problems to be solved by the invention]
The present invention pays attention to the fact that when the soft mud such as dredged soil is pneumatically fed to the land, a “plug flow”, which is a phenomenon in which the soft mud and air are alternately fed in the pressure feeding pipe, is generated. , Connecting a tubular mixing section with a diameter larger than that of the pressure feeding pipe in the middle of the pressure feeding pipe, eliminating the need for special solidification processing equipment such as a kneading mixer, and making the soft mud soil and the solidified material extremely simple in the tubular mixing section. The present invention proposes an economical soft mud solidification method and apparatus capable of homogeneously stirring and mixing by a simple method.
[0004]
[Means for Solving the Problems]
That is, the present invention connects a mixing pipe having a diameter larger than that of the pressure feeding pipe in the middle of a pneumatic feeding pipe in which soft mud such as dredged material is pumped as a plug flow, and is connected to an axial center in the mixing pipe. Soft mud soil in which a plurality of solidification material outlets are opened and a tubular solidification material supply shaft having a plurality of blades attached obliquely at a predetermined interval on the outer periphery is inserted and fed into the mixing tube Mixing and solidifying the soft mud soil in the tube by homogeneously stirring and mixing with the solidified material by the synergistic effect of the turbulent flow generated by the inclination of the mixing tube and the expansion effect of the tube diameter and the stirring action of the blades And the device. Hereinafter, embodiments of the method of the present invention will be described with reference to the drawings.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory diagram showing an outline of dredging soft mud soil dredged by a dredger to a landfill on land. 1 is a dredger, 2 is a soil carrier, 3 is a pneumatic ship, and this pneumatic ship 3 It is pneumatically fed to the land via the pressure feed pipe 4. Reference numeral 5 denotes a solidifying material supply facility such as cement slurry. In this facility 5, the tubular mixing device A according to the present invention is connected to the pressure feeding pipe 4, and the solidified material is stirred and mixed in the soft mud and fed again to the pressure feeding pipe 4. And discharged to landfill 6.
[0006]
FIG. 2 is a partial sectional side view of the tubular mixing device A according to the present invention, FIG. 3 is an explanatory longitudinal sectional view of the tubular mixing device A, and 7 is a mixing tube whose both ends are closed. The mixing pipe 7 has a diameter larger than that of the pressure feeding pipe 4 and is inclined, and a pressure feeding pipe 4a from the pneumatic feeding ship 3 is connected to the upper side surface so that the clay is contained in the mixing pipe 7. The pumping pipe b which is supplied and goes to the landfill 6 is connected to the lower side surface.
[0007]
Reference numeral 8 denotes a tubular solidified material supply shaft inserted and fixed to the inner shaft center portion of the mixing tube 7 from above. A plurality of pieces (three in the figure) are provided on the outer periphery of the supply shaft 8 at predetermined intervals in the length direction. ) 9 are fixed radially and obliquely with respect to the shaft 8, and a plurality of solidified material jets 10 are opened at equal intervals on the shaft 8. Solidified material such as slurry is jetted at high pressure.
[0008]
Thus, when the clay is pressed into the pressure feed pipe 4a together with the compressed air by the pneumatic ship 3, the clay is intermittently fed as a plug flow in the pressure feed pipe 4a as described above. To be sent to.
[0009]
Since the pipe diameter of the mixing pipe 7 is larger than that of the pressure feeding pipe 4a as described above, the plug flow resistance is reduced, and the mixing pipe 7 is installed so as to be inclined obliquely. A large turbulent state occurs.
[0010]
Further, cement slurry as a solidifying material is injected at high pressure from the outlet 10 of the supply shaft 8 at the inner shaft of the mixing tube 7, and the turbulent flow in the tube 7 and a plurality of sheets attached obliquely to the supply shaft 8. Due to the synergistic effect of the stirring action of the blades 9, the clay flows down through the mixing tube 7 while being efficiently and uniformly stirred and mixed with the cement slurry.
[0011]
Then, the clay that has been effectively homogeneously mixed with the solidified material as described above in the inclined mixing pipe 7 is discharged from the mixing pipe 7 connected to the lower part toward the small-diameter feeding pipe 4b, and is again plugged. And then pumped to landfill 6.
[0012]
【The invention's effect】
The present invention is configured as described above, and in the middle of a pneumatic feed pipe for pumping soft mud soil such as dredged soil, a mixing pipe whose both ends have a larger diameter than the pipe is inclined and connected, and the pressure feed pipe Are connected to both upper and lower side surfaces of the mixing tube, whereby a plurality of solidified material outlets are opened in the axial center portion of the mixing tube, and a plurality of blades are provided at predetermined intervals on the outer periphery. It is possible to insert a solidified material supply shaft in the form of a tube attached obliquely so that the solidified material can be mixed homogeneously, and the clay that is pumped into the mixing tube as a plug flow is inclined to the mixing tube. It is possible to stir and mix with the solidified material efficiently and homogeneously through the synergistic effect of the turbulent flow generated by the effect of expanding the pipe diameter and the stirring action of the blades of the solidified material supply shaft. If not, the economy of plug flow In is the homogeneous mixing is possible.
[0013]
In addition, according to the present invention, the mixing tube can be manufactured with commercially available equipment and can be unitized. By connecting with the pressure feeding tube, it can be used for large-scale treatment of soft mud such as dredged soil. is there.
[0014]
As described above, according to the present invention, the solidification processing facility for dredged soil can be simplified as compared with the prior art, and the drastically reduced cost can be achieved, and dredged soil that has been difficult to dispose of can be effectively used. If it is used as the ground material for landfills, ground improvement after landfill is unnecessary or can be greatly reduced, so that the land can be used at an early stage.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram showing an outline until soft mud soil dredged by a dredger is sent to a landfill site using the method of the present invention.
FIG. 2 is a partial cross-sectional side view of the mixed solidification treatment apparatus for soft mud soil according to the present invention.
FIG. 3 is an explanatory longitudinal sectional view of the mixed solidification treatment apparatus for soft mud soil according to the present invention.
FIG. 4 is a perspective view showing a main part of a solidifying material supply shaft.
[Explanation of symbols]
1-dredger ship 2-earth carrier ship 3-pneumatic ship 4-pressure feed pipe 5-solidification material supply equipment 6-landfill 7-mixing pipe 8-solidification material supply shaft 9-wing 10-solidification material outlet A-of the present invention Tubular mixing device

Claims (2)

A mixing pipe having a diameter larger than that of the pressure feeding pipe is inclined and connected in the middle of a pneumatic feeding pipe in which soft mud such as dredged soil is pumped as a plug flow, and a solidified material outlet is provided at the axial center of the mixing pipe. A plurality of open holes and a solidified material supply shaft in which a plurality of blades are obliquely mounted and fixed at a predetermined interval on the outer periphery are inserted and fixed , and the soft mud soil fed into the mixing tube is mixed. A mixed solidification treatment method of soft mud soil in a tube characterized by homogeneously stirring and mixing with the solidified material by the synergistic effect of the generation of turbulent flow caused by the inclination of the tube and the expansion of the tube diameter and the stirring action of the blades. A mixing pipe having a diameter larger than that of the pressure feeding pipe is inclined and connected in the middle of a pneumatic feeding pipe for pressure feeding soft mud such as dredged soil, and a plurality of solidification material outlets are opened in the axial center portion of the mixing pipe. And a solidified solid material supply shaft in which a plurality of blades are obliquely mounted and fixed at a predetermined interval on the outer periphery thereof is inserted and fixed .

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