JP2000144798A - In-pipe mixing-solidification treating method and device for soft clay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide economical solidification treating method and device for soft clay, in which a special solidification treating facility such as a kneading mixer is made unnecessary, by utilizing a plug flow generated in a force-feed pipe, connecting a tubular mixing section to the intermediate section of the force-feed pipe and homogeneously against and mixing soft clay and a solidification material by an extremely simple method in the mixing section when soft clay such as a dredged material is force-fed by air towards a land. SOLUTION: A mixing pipe 7 having a diameter larger than a force-feed pipe 4 is connected obliquely to the intermediate section of an air force-feed pipe 4a, in which soft clay such as a dredged material is force-fed as a plug flow, and a plurality of solidification-material exhaust nozzles 10 are bored to an axial center section in the mixing pipe 7 while a tubular solidification-material feed shaft 8, in which a plurality of blades 9 are installed slantingly on an outer circumference at regular intervals, is inserted. Soft clay fed into the mixing pipe 7 is stirred and mixed homogeneously with a solidification material by a synergistic effect by the generation of a turbulent flow generated by the inclination of the mixing pipe 7 and the expansion effect of a pipe diameter and the agitation action of the blades 9 at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for efficiently mixing and mixing a solidified material with a solidified material in a pipe during the process of pumping soft muddy soil having a high moisture content, such as dredged soil, and the like. The present invention relates to a method and an apparatus for mixing and solidifying soft mud in a pipe without the need for mixing equipment.

[0002]

2. Description of the Related Art Conventionally, in order to effectively use dredged soil as a resource, a solidifying material has been added to the dredged soil to use it as a ground material for, for example, a landfill. Conventional methods for solidifying dredged soil include a method using a large mechanical kneading mixer to uniformly knead the dredged soil and the solidified material, and an air pumping pipe in which soft mud soil is pumped as a plug flow. A mixing method in a tube in which a solidifying material is added to a mixture and the mixture is stirred and mixed is known. However, the former generally uses a dedicated ship or a dedicated plant, and the equipment becomes larger and the processing cost becomes higher.The latter reduces the processing cost, but the homogeneity of the mixed soft mud becomes uneven. There is a problem that the quality varies greatly.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a phenomenon in which, when pulverized soft mud such as dredged soil is pneumatically fed to land, the soft mud and air are alternately fed in a pumping pipe. Paying attention to the occurrence of "plug flow", connecting a tubular mixing section having a larger diameter than 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 using the tubular mixing section. It is an object of the present invention to provide an economical method and apparatus for solidifying soft mud so that the soft mud and the solidified material can be homogeneously stirred and mixed by a very simple method.

[0004]

That is, according to the present invention, a mixing pipe having a larger diameter than the pumping pipe is inclined and connected to the middle of an air pumping pipe through which soft mud such as dredged soil is pumped as a plug flow. A plurality of solidified material jets are opened at the axial center portion of the mixing tube, and a tubular solidified material supply shaft having a plurality of blades attached obliquely at predetermined intervals on the outer periphery is inserted. It is characterized in that the soft mud fed into the mixing pipe is homogeneously stirred and mixed with the solidified material by the synergistic effect of the generation of turbulence caused by the inclination of the mixing pipe and the effect of expanding the pipe diameter and the stirring action of the blade. The present invention relates to a method and an apparatus for mixing and solidifying a soft mud in a pipe. Hereinafter, an embodiment of the method of the present invention will be described with reference to the drawings.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view schematically showing a dredger sending dredged muddy soil to a landfill on land. Reference numeral 1 denotes a dredger, 2 denotes a soil carrier, and 3 denotes a pneumatic carrier. The dredged soil is pneumatically fed to the shore via the feed pipe 4 by the ship 3. Numeral 5 is a solidification material supply equipment for cement slurry or the like. In this equipment 5, the tubular mixing device A according to the present invention is connected to the pressure feeding pipe 4, the solidification material is agitated and mixed with the soft mud, and fed again to the pressure feeding pipe 4. To landfill 6.

FIG. 2 is a partial cross-sectional side view of the above-described tubular mixing device A according to the present invention, and FIG. 3 is an explanatory longitudinal sectional view of the tubular mixing device A. Reference numeral 7 denotes both ends closed. In the mixing pipe, the mixing pipe 7 has a diameter larger than that of the pressure feeding pipe 4 and is installed at an angle. The pressure feeding pipe 4a from the air pressure boat 3 is connected to the upper side surface, and the mixing pipe 7 is inserted into the mixing pipe 7. The dredged soil is supplied, and a pumping pipe b toward the landfill 6 is connected to the lower side surface.

Reference numeral 8 denotes a tubular solidified material supply shaft which is inserted into and fixed to the axial center portion of the mixing tube 7 from above, and a plurality of the solidified material supply shafts are provided on the outer periphery of the supply shaft 8 at predetermined intervals in the longitudinal direction thereof (FIG. Then 3
Wings 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. A high-pressure injection of a solidifying material such as a cement slurry is performed.

[0008] When the dredged soil is pressed together with the compressed air into the pumping pipe 4a by the pneumatic pumping vessel 3, the dredged soil is intermittently fed as a plug flow in the pumping pipe 4a and mixed as described above. It is sent into the pipe 7.

As described above, the mixing pipe 7 has a larger diameter than the pressure feed pipe 4a, so that the resistance of the plug flow is reduced and the mixing pipe 7 is installed so as to be inclined. Large turbulence condition due to dredged soil occurs.

Further, a high-pressure cement slurry as a solidifying material is injected from the jet port 10 of the supply shaft 8 at the axial center of the mixing pipe 7, and the cement slurry is obliquely attached to the turbulent flow in the pipe 7 and the supply shaft 8. Due to the synergistic effect of the stirring action of the plurality of blades 9, the dredged soil flows down the mixing pipe 7 while being efficiently and uniformly stirred and mixed with the cement slurry.

Then, the dredged soil that has been effectively and homogeneously mixed with the solidified material in the inclined mixing pipe 7 is discharged toward the pumping pipe 4b having a smaller diameter than the mixing pipe 7 connected to the lower part,
It again becomes a plug flow and is pumped to the landfill 6.

[0012]

According to the present invention, as described above, a mixing pipe whose both ends are closed and whose diameter is larger than that of the pipe is inclined and connected in the middle of an air pumping pipe for feeding soft mud such as dredged soil. The pressure feed pipes are connected at both upper and lower sides of the mixing pipe, whereby a plurality of solidified material ejection ports are opened in the axial center of the mixing pipe, and a predetermined interval is provided on the outer circumference. It is possible to insert a solidified material supply shaft in which a plurality of wings are obliquely mounted and insert the solidified material homogeneously, and the dredged soil that is pumped as a plug flow into the mixing pipe is The turbulence generated by the inclination of the mixing pipe and the effect of expanding the pipe diameter and the synergistic effect of the agitating action of the wing of the solidified material supply shaft enable efficient and homogeneous stirring and mixing with the solidified material. Plug flow can be achieved without using a It become possible economical and homogeneous mixing by.

According to the present invention, the mixing pipe can be manufactured with commercially available equipment and can be made into a unit. Therefore, by connecting the mixing pipe to the pumping pipe, the mixing pipe can be used for large-scale treatment of soft mud such as dredged soil. We can respond.

As described above, according to the present invention, the equipment for solidifying dredged soil and the like can be simplified as compared with the prior art, so that the cost can be significantly reduced, and the dredged soil and the like which have been difficult to dispose can be effectively used. If this is used as a ground material for a landfill, ground improvement after landfill is not necessary or can be greatly reduced, so that there is an advantage that land can be used early.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an outline up to sending dredged muddy soil to a landfill site using a method of the present invention.

FIG. 2 is a partial cross-sectional side view of an apparatus for mixing and solidifying soft mud in a pipe according to the present invention.

FIG. 3 is an explanatory longitudinal sectional view of an apparatus for mixing and solidifying soft mud in a pipe according to the present invention.

FIG. 4 is a perspective view showing a main part of a solidified material supply shaft.

[Explanation of symbols]

 Reference Signs List 1-Dredger 2-Soil carrier 3-Pneumatic pump 4-Pumping pipe 5-Solidification material supply facility 6-Landfill 7-Mixing pipe 8-Solidification material supply shaft 9-Blade 10-Solidification material jet A-The present invention Tubular mixing device

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Takashi Hanari Inventor, Kokuso Shibaura Building, National Land Construction Co., 3-8-15 Kaigan, Minato-ku, Tokyo

Claims (2)

[Claims] 1. A mixing pipe having a diameter larger than that of the pumping pipe is connected to the middle of an air pumping pipe through which soft mud such as dredged soil is pumped as a plug flow. A plurality of solidified material ejection ports are opened, and a tubular solidified material supply shaft having a plurality of blades attached obliquely at predetermined intervals on the outer periphery is inserted, and the soft mud fed into the mixing pipe is inserted. Turbidity generated by the effect of the inclination of the mixing tube and the expansion of the diameter of the mixing tube, and homogeneously stirring and mixing with the solidified material by a synergistic effect of the stirring action of the blades. . 2. A mixing pipe having a diameter larger than that of the pumping pipe is connected to the middle of an air pumping pipe for pumping soft mud such as dredged soil, and a solidified material ejection port is provided at an axial center of the mixing pipe. Characterized in that a tubular solidification material supply shaft having a plurality of blades mounted diagonally at predetermined intervals on the outer periphery and having a plurality of blades inserted therein is inserted therein, and the mixed solidification treatment in a muddy pipe is characterized by being inserted therein. apparatus.