JP2002285571A - Production equipment for fluidized treated soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently produce fluidized treated soil having a stabilized quality which permits to completely dissolve mud having cohesive soil as the main component in a small installation space. SOLUTION: A mud dissolving equipment 11 of this machine has a material inlet 20a and a rotation drive shaft 21 along a horizontal direction at a cross section center position of a horizontal type cylindrical drum 20 having a material exhaust port 20b, for the rotation drive shaft 21, a plurality of shovel vanes 23, 23,... are provided at proper intervals in the longitudinal direction of the members with the fixing positions mutually varied in the circumferential direction between the neighboring vanes, and a mixing machine with the construction arranged with chopper vanes 24 and 24 at the bottom side of the horizontal type cylindrical drum 20 is employed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing fluidized soil for recycling mud mainly composed of clayey soil generated during excavation work as fluidized soil.

[0002]

2. Description of the Related Art In recent years, in a shielding work in an urban area, in order to suppress the generation amount of construction by-products and promote recycling, a fluidized soil construction method that effectively uses construction waste soil as invert material or backfill material has been adopted. More cases are being adopted.

[0003] In the case of a muddy shield, a method of producing a fluidized soil by adding a solidifying material to excess mud is adopted. In the case of an earth pressure shield, generated mud is temporarily stored in a pit. A method in which mud, water and a solidifying material are kneaded in a pit with a backhoe shovel or the like to perform fluidization (preceding example 1), or a method in which mud is directly introduced into a forced kneading mixer and kneaded with water (preceding example). 2) was adopted. As the solidifying material, cement, cement-based solidifying material, lime and the like are mainly used, and additives and the like are added as necessary.

[0004]

However, in the case of the method according to the preceding example 1, the equipment becomes large due to the use of heavy equipment and the like, and installation in a narrow place is difficult.
There were problems such as poor production efficiency. In addition, in the case of the method according to the preceding example 2, even if an attempt is made to shear and agitate the earth mass using a forced kneading mixer, it takes time to fragment (dissolve) the earth mass, and there are many earth mass particles that cannot be completely sheared. And the mixing with the solidified material becomes non-uniform, so that the quality of the fluidized soil is not stable. Furthermore, when a plurality of forced kneading mixers are installed for efficient fluidization, there is a problem that the occupied area of the equipment becomes large.

Accordingly, a main object of the present invention is to reduce the installation space, to dissolve mud mainly composed of viscous soil completely in a short time, and to efficiently manufacture fluidized soil having stable quality. An object of the present invention is to provide an apparatus for producing a fluidized soil to be obtained.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, after sludge is decomposed mainly of clayey soil, a solidifying material is added to the decomposed muddy water, kneaded, and the fluidized soil is treated. In the fluidized treated soil manufacturing apparatus for manufacturing the soil, as a mud separator for de-mudging the mud, with a material input port, along the horizontal direction at the cross-sectional center position of the horizontal cylindrical drum having a material discharge port A rotary drive shaft is provided, and the rotary drive shaft is provided with a plurality of shovel blades having fixed circumferential positions different from each other at appropriate intervals in the longitudinal direction of the member and between adjacent ones, and The present invention is characterized in that a mixer having a structure in which chopper blades are disposed on the bottom side of a horizontal cylindrical drum is used.

In this case, a triangular pyramid-shaped ski-type shovel blade is used as the shovel blade, and a multistage chopper blade in which the blades are arranged in a multi-stage in a cross shape along the longitudinal direction of the rotating shaft is used as the chopper blade. desirable.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an overall view of an apparatus for producing fluidized soil according to the present invention, FIG. 2 is a perspective view of a mud slicing apparatus used for mud slicing, and FIG. 3 is a cross-sectional view thereof. .

[0010] Mud pressure shield excavation is a shield excavation method suitable mainly for cohesive soil or a layer containing cohesive soil. In recent years, it is necessary to reduce the number of auxiliary facilities and to reduce the size of work yards and shafts. It is heavily used. Conventionally, mud transportation using a belt conveyor has been the mainstream in mud pressure shield excavation.In recent years, however, pump pumping methods have been widely used for reasons such as ensuring safety inside the mine and improving the efficiency of earth removal work. ing.

Conventionally, the discharged mud is exclusively disposed of. However, in the present invention, the mud pressure shield 1 is used to effectively utilize a part of the discharged mud as invert material or backfill soil. The pumping line to be pumped is branched on the way, and the one side pumping line is guided to the earth and sand hopper 5 and the other side pumping line is guided to the fluidized soil production system 6 to produce fluidized soil. .

More specifically, in the mud pump pumping equipment for excavating the mud pressure shield, a pump 3 for pumping is placed below the screw conveyor 2 installed in the mud pressure shield 1 and mud dropped from the screw conveyor 2 is removed. The pumping pipe 4 is branched from the middle, the one-side pumping pipe 4A is guided to the earth and sand hopper 5, and the other-side pumping pipe 4B is connected to the fluidized soil production system 6 To lead to. The amount required as backfill soil is a part of the excavated soil, and during the excavation process, due to changes in the geological layer, it may encounter an unsuitable sand layer or sandy soil layer as fluidized soil,
This is because the mud flow path can be switched so that a desired amount of the generated mud and soil properties suitable as fluidized soil can be treated as fluidized soil.

In the fluidized soil production system 6,
First, the fed mud is fed into the receiving hopper 7 for quantitative supply of the mud. The mud introduced into the receiving hopper 7 is transferred by the screw conveyor 8 to the relay hopper 9.
After being charged into the pulverizer, the pressure-reducing pump 10
And a predetermined amount of water is supplied from the fresh water tank 13 in the mud-removing apparatus 11, and the mud is de-mulled into a slurry.

In the present invention, the skid-type shovel blade-type high-speed mixer shown in FIGS. This ski-type shovel blade type high-speed mixer has a material input port 20a at the top,
A rotary shaft 21 is disposed along the horizontal direction at the center of the cross section of a horizontal cylindrical drum 20 having a material discharge port 20b provided with a gate that can be opened and closed at the bottom, and a side portion of the horizontal cylindrical drum 20. The rotating shaft 21
FIG. 3 shows an apparatus in which a driving source 22 for driving the rotation is disposed. The rotating shaft 21 is provided at appropriate intervals in the longitudinal direction of the member and at circumferentially different fixing positions between adjacent ones. A plurality of, in the illustrated example, three excavator blades 23, 23 just divide the circumferential direction exactly in a sectional view.
Are provided and chopper blades 24, 24 are provided on the bottom side of the drum 20 and between the shovel blades 23, 23,.
Reference numeral 25 denotes an air vent hole 25 provided in the horizontal cylindrical drum 20.

As the shovel blade 23, as shown in FIG. 4, a triangular pyramid-shaped ski-shaped shovel blade 23A,
23B is preferably used, while the chopper blade 24 is used.
As shown in FIG. 5, a chopper blade 2 in which blades are arranged in multiple stages in a cross shape along the longitudinal direction of the rotation axis.
4A and 24B are preferably used.

The shovel blades 23 mainly perform the kneading action of the mud, while the chopper blades 24 mainly perform the high-speed shearing and dispersing action, so that even mud having high viscosity can be completely dissolved. That is, the shovel blade 23
Moves and stirs mud three-dimensionally by the floating diffusion effect,
In addition to mixing efficiently and homogeneously in a short time, the chopper blades 24 apply a high-speed shearing action to the mud, and even if the clay is clumpy and has high viscosity, it can be completely dissolved in a slurry.

A mud separator (ski-type shovel blade type high-speed mixer) having the above-described structure and function is provided on the market as, for example, a pro-share mixer (manufactured by Taiheiyo Kiko Co., Ltd.) in the field of powder mixing technology. The mixer that has been used can be used as it is.

The mud which has been pulverized is pulverized by the above-mentioned pulverizing apparatus 11 to form a slurry, and then the under tank 12
After that, the mixture is sent to the next solidification material mixing process (not shown), where the solidification material such as cement is further charged and stirred to produce fluidized soil.

In the above-described example, a batch-type de-pulping apparatus is used. However, when mud soil is continuously de-pulverized, a material input port is provided at one end of the horizontal cylindrical drum 20 and at the other end. A continuous ski type excavator blade type high-speed mixer having a material discharge port on the side and capable of continuously processing the material is used.

[0020]

[Example] The mud pumped from the pit has the water required for pumping retained in the inner circumference of the pipe, but the inside remains in the state of a solid mass, and this viscous mud is dissolved. An experiment was conducted to select a mixer model suitable for mud dissolution.

<Experimental Method> Using three types of mixers, a plowshare mixer, a forced kneading mixer and a spiral pin mixer, dissolution experiments were performed using viscous soils having the physical properties shown in Table 1 as samples. In the experiment, kneading was performed for 10 minutes, the kneading state was observed after 1, 2, 3, 4, 5, and 10 minutes, and the specific gravity of muddy water and JHS flow were measured. Table 2 shows the experimental results.

<Structure of Each Mixer> Although the plowshare mixer has already been described, the forced kneading mixer is shown in FIG.
As shown in FIG. 1, a main shaft 31 rotatable around a vertical axis is provided inside a cylindrical kneading tank 30 having a bottom, a rotor 32 is provided on the main shaft 31, and a plurality of kneading blades 33, 33 are provided on the rotor 32. This is a mixer with a structure that is usually used for mortar and concrete kneading.

On the other hand, the spiral pin mixer is shown in FIG.
As shown in the figure, a dispersion rotor 35 is provided inside the charging port with a predetermined gap in the inverted truncated conical drum 34, and a large number of pins 36a are provided on the upper surface and the peripheral surface. , 36b are implanted in the mixing / kneading machine having a structure in which the mixing rotor 36 is installed, and the material introduced from the introduction port is uniformly introduced in the entire circumferential direction by the dispersion rotor 35 rotating at a high speed. The water passes through the inside of the dispersion rotor 35 and is uniformly introduced in the entire circumferential direction in the same manner as the input material. The material introduced into the drum is first roughly sheared by primary dispersing pins 36a, 36a... Arranged spirally on the upper surface of the mixing rotor 36, and then retained in a vortex shape by the rotational force of the mixing rotor 36. While doing, the secondary dispersion pins 36b on the peripheral surface,
It is severely sheared by 36b ...

[0024]

[Table 1]

[0025]

[Table 2]

The following findings were obtained from the above experiments.

In the case of the plowshare mixer according to the present invention, viscous soil and water are kneaded by a shovel blade rotating at a high speed, and at the same time, the viscous soil is sheared and dispersed by a chopper blade to obtain highly viscous earth and sand. Can be completely dissolved.

In the case of the forced kneading mixer, earth and sand and water rotated in the kneading tank together with the blades, and the earth and sand and water did not completely dissolve even over a long period of time.

In the case of the spiral pin mixer, mixing is not problematic when the viscosity of the mud is low, but when the viscosity is high, the rotational load of the pin is increased, the rotor is stopped, and the inside of the mixer is blocked by mud.

From the above results, it was found that the prossure mixer was suitable for dissolving clayey soil.

[0031]

As described in detail above, according to the present invention, the installation space can be reduced, and the mud mainly composed of viscous soil can be completely dissolved in a short time. It can be manufactured efficiently.

[Brief description of the drawings]

FIG. 1 is an overall view of an apparatus for producing fluidized soil according to the present invention.

FIG. 2 is a partially broken perspective view of a mud-removing device used for mud-removing mud.

FIG. 3 is a cross-sectional view (a view taken along the line III-III in FIG. 2) of the deflocculating apparatus.

FIG. 4 is an enlarged perspective view of the shovel blade.

FIG. 5 is an enlarged perspective view of a chopper blade.

FIG. 6 is a sectional structural view of a forced kneading mixer.

FIG. 7 is a sectional structural view of a spiral pin mixer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mud pressure shield, 2 ... Screw conveyor, 3 ... Pump for pumping, 4 ... Pumping piping, 5 ... Sand hopper, 6 ... Fluidized soil production system, 7 ... Receiving hopper, 8 ... Screw conveyor, 9 ... Relay hopper, 10 ... pressure feed pump, 1
1 ... Mud separator, 12 ... Under tank, 13 ... Shimizu tank,
20: Horizontal cylindrical drum, 20a: Material inlet, 20b
... Material discharge port, 21 ... Rotary shaft, 22 ... Drive source, 2
3: Excavator blade, 24: Chopper blade

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yukikazu Hanada 6-24-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Sato Industry Co., Ltd. Tokyo Branch (72) Inventor Taku Kobayashi 6-24- Nishi-Shinjuku, Shinjuku-ku, Tokyo 1 Sato Kogyo Co., Ltd. Tokyo branch F term (reference) 4D065 CA06 CB10 CC06 DD04 DD24 EA08 EB03 4G078 AA03 AB01 BA01 BA09 CA01 CA05 CA12 CA17 DA26 DA28 DA30 EA08

Claims (2)

[Claims] An apparatus for manufacturing fluidized soil, comprising: demulsifying mud mainly composed of viscous soil; adding a solidifying material to the demulsified mud; kneading to produce a fluidized soil; As a deflocculator for performing deflocculation, a rotary drive shaft is provided along the horizontal direction at the center of the cross section of a horizontal cylindrical drum having a material discharge port, and a material input port is provided. On the other hand, a plurality of shovel blades whose circumferential fixing positions were different from each other at appropriate intervals in the longitudinal direction of the member and between adjacent members were provided, and chopper blades were disposed on the bottom side of the horizontal cylindrical drum. An apparatus for producing fluidized soil, comprising using a mixer having a structure. 2. The shovel blade is a triangular pyramid-shaped ski-type shovel blade, and the chopper blade is a multistage chopper blade in which the blades are arranged in multiple stages in a cross shape along the longitudinal direction of a rotating shaft. An apparatus for producing fluidized soil according to the above.