KR20080104948A - Drain material and method for treating drainage and method for constructing drain - Google Patents

Abstract

A drain material and a drainage disposal method are provided to use coal cinders, especially reclaimed coal cinders effectively, and to form a sand mat layer having excellent interactivity and efficiency on the soft ground. A drainage disposal apparatus includes a sand pump(11) for loamy soil installed to a barge(10) carrying sandy soil, a loamy soil layer(12) connected to the sand pump and introduced to a mixing device(30), a hopper(14) installed to the mixing device to inject coal cinders together with sandy soil, a temporary storage tank(15) storing up drain materials crushed by the mixing device temporarily, a return pipe(16) connected to the lower part of the temporary storage tank, and an air conveying pipe(17) connected to the return pipe.

Description

DRAIN MATERIAL AND METHOD FOR TREATING DRAINAGE AND METHOD FOR CONSTRUCTING DRAIN}

The present invention mainly relates to drainage and drainage treatment methods suitable for use in drainage methods for promoting drainage from soft ground such as dredged soils such as sea areas, rivers, lakes and swamps, and drainage methods using the same.

Background Art Conventionally, a drainage method for forming a sand mat layer by laminating sand on a soft ground for improving the soft ground, and then forming a vertical drain material such as sand drain using a vertical drain material is known. (See patent document 1 etc.).

Such a method for forming the sand mat layer requires a permeability and a strength sufficient to support the sand drain construction machine, and also the workability at the time of forming the sand mat layer is a big problem.

Patent Document 1: Japanese Patent Application Laid-Open No. 2002-4263

SUMMARY OF THE INVENTION The present invention focuses on such a conventional problem and provides a drainage and drainage treatment method excellent in water permeability and also a drainage method using the same, which improves the workability of the sand mat layer composition on the soft ground such as dredged soil. It is a task to do it.

The 1st aspect of this invention for solving the said subject is a waste material characterized by mixing sandy soil and coal ash in 40: 60-60: 40 weight ratio.

In such a 1st aspect, by mixing a sandy soil and a coal material in a predetermined ratio, it can be set as the drainage material which was excellent in air conveyance and improved water permeability.

A second aspect of the present invention is the wastewater according to the first aspect, wherein a water permeability coefficient of the drainage material is 10 times or more relative to the permeability coefficient of the sandy soil.

In such a 2nd aspect, permeability improves by mixing sandy soil and a coal material at a predetermined ratio, and when it is set as a sand mat layer, it becomes excellent in drainage.

A third aspect of the present invention is the drainage material according to the second aspect, wherein the water permeability coefficient of the drainage material is larger than 0.1 cm / sec.

In such a 3rd aspect, when water permeability is further improved and it is set as a sand mat layer, it becomes excellent in drainage.

The 4th aspect of this invention is a wastewater treatment method using the drainage material in any one of 1st aspect-3rd aspect.

In such a fourth aspect, the workability of sand mat layer formation can be improved by using sand drainage and coal ash mixed in a predetermined ratio, and using the drainage material which was excellent in air conveyance property and improved water permeability.

According to a fifth aspect of the present invention, a sand mat layer is formed on the soft ground by mixing sandy soil and coal ash in a weight ratio of 40:60 to 60:40 to form a drain material, and air conveying the waste material on the soft ground. It is a drainage method characterized by including a process.

In such a fifth aspect, the sand mat layer can be formed with good workability by mixing sandy soil and coal ash at a predetermined ratio and pneumatically conveying a drain material having excellent air conveyability.

According to a sixth aspect of the present invention, in the drainage method described in the fifth aspect, the water permeability coefficient of the drainage material is greater than 0.1 cm / sec or satisfies any one of 10 times or more relative to the permeability coefficient of the sandy soil. It is a drainage method characterized by.

In such a sixth aspect, sand sand and coal material are mixed at a predetermined ratio to provide a sand mat layer having improved water permeability, thereby providing excellent drainage.

A seventh aspect of the present invention is the drainage method according to the sixth aspect, wherein the water permeability coefficient of the drainage material is larger than 0.1 cm / sec.

In such a seventh aspect, sand sand and coal material are mixed at a predetermined ratio to provide a sand mat layer having improved water permeability, thereby providing excellent drainage.

According to the present invention, when forming a sand mat layer on soft ground such as dredged soil, by using a mixture of sand and coal ash in a predetermined ratio, coal ash, in particular landfilled coal ash, can be effectively used, and air-pneumatic properties And it can be made the drainage material excellent in permeability, and can form the sand mat layer with high functionality and efficiency on a soft ground.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

1 schematically shows an example of an apparatus for practicing the present invention. As shown in the figure, a sand pump 11 for loam is provided on a towing vessel 10 for transporting sandy soil, a loam pipe 12 is connected to the sand pump 11, and the loam pipe 12 is It is introduced to the mixing device 30. The mixing device 30 is described below with reference to FIGS. 2 and 3, which in this example is a rotary crushing mixing device. The mixing device 30 is provided with a hopper 14 for injecting coal ash and the like together with the sandy soil, and the waste material crushed and mixed with the mixing device 30 is temporarily stored in the temporary storage tank 15 connected to the lower part thereof. It is. In addition, the lower end of the temporary storage tank 15 is connected to the start end of the conveying pipe 16, and the air conveying pipe 17 communicates with the conveying pipe 16 so as to pressurize the drainage material.

Here, in the mixing apparatus 30 which is a rotary crushing mixing apparatus, as shown in FIG. 2 which schematically shows a longitudinal section, and FIG. 3 which shows the cross section of a principal part, the support stand 32 is provided in the inside of the casing 31, A plurality of support rollers 34 rotatably installed on a horizontal axis penetrating the standing wall 33 of the support 32 in the horizontal direction are provided in the circumferential direction, and a cylindrical shape in which the upper and lower sides are opened on the support roller 34. Vertical processing container 35 is rotatably mounted about its central axis. That is, the flange-shaped rail 36 and the gearwheel 37 are fixed to the outer peripheral surface of the vertical processing container 35, and the vertical processing container 35 is rotated by the support roller 34 via the rail 36. Possibly supported. In addition, a plurality of electric motors 38 are provided above the support 32 provided inside the casing 31, and the pinion 39 meshing with the gears 37 of the vertical processing container 35 is provided on the rotating shaft thereof. Attached.

The upper part of the casing 31 is covered with the upper cover 40 so that the rotating shaft 42 rotatably supported by the bearing 41 provided in the substantially center portion of the upper cover 40 penetrates the vertical processing container 35. It is prepared. The outer circumferential surface of the rotary shaft 42 is provided with plural places in the circumferential direction, four in the embodiment, plural in the axial direction, and four places in the embodiment, and each ring 43 has a plurality of rings. The rotating member 44 which connected this to the chain form is attached. On the other hand, the upper end of the rotating shaft 42 is provided with a pulley 45, the pulley 45 is connected to the pulley 47 and the drive belt 48 provided on the rotating shaft of the electric motor 46.

In addition, a scraper 50 is provided on the upper cover 40. The scraper 50 has a deodorizing member 51 disposed close to the inner circumferential surface of the vertical processing container 35, and the deodorizing member 51 has a crank shaft 52 and an electric motor 53 connected to the upper portion thereof. It reciprocates in the up-down direction by the crank mechanism which consists of the crank board 54 provided in the).

On the other hand, between the upper end of the vertical processing container 35 and the upper cover 40 is provided with a cylindrical upper chute 55 fixed to the lower surface of the upper cover 40, the opening of the upper chute 55 is the upper cover It is provided at 40, and is connected to the inlet port (not shown) for inject | pouring the material to mix and process. On the other hand, a lower chute 56 for discharging the solidified soil, which has an inverted cone shape and is formed by being crushed and mixed, is provided below the vertical processing container 35.

In order to mix the sandy soil and the coal ash by such a mixing device 30, the vertical processing container 35 is rotated via the pinion 39 and the gearwheel 37 by first driving the electric motor 38, By driving the electric motor 46, the rotating shaft 42 is rotated at high speed via the above-mentioned drive transmission system, and the plurality of rotating members 44 suspended at their own weight are horizontally supported to rotate at high speed. In this state, when the soft soil and coal ash and cement are further added at a predetermined rate from an inlet not shown in the figure, the injected material drops from the upper chute 55 into the vertical processing container 35 and rotates at high speed while falling. It is crushed and mixed while being hit by the rotating member 44 which is a driven rotating body, and the drain material is discharged from the lower chute 56. On the other hand, at this time, the deodorizing member 51 of the scraper 50 reciprocated in the vertical direction by the electric motor 53, although the material during the crushing mixing or the crushed mixed material is going to be accumulated and grown on the inner circumferential surface of the vertical processing container 35. The vertical processing container 35 which rotates and cooperates to prevent deposition growth.

As such, the sand ash and coal ash in a weight ratio of 40:60 to 60:40 are mixed in a drainage material having a bulk density of 9 kN / m 3 or less, and air transportability is remarkably improved. Moreover, it is 10 times or more of the permeability coefficient of sandy soil, for example, a permeability coefficient is larger than 0.1 cm / sec.

Here, the sandy soil is not particularly limited, and it is also possible to use mountain sand and sea sand, for example, it is preferable to use one having a water content of about 10%. In addition, "coal ash" is a clinker ash or a fly ash, preferably a clinker ash. On the other hand, what is already landfilled as coal material may be used, and even if such coal material is used, it can be set as the drainage material which has good air-feedability and a large permeability coefficient.

In addition, although the preferable mixing ratio of sandy soil and coal ash differs with each water content ratio etc., when it is a range of 1: 3-3: 1 by weight ratio, it will become a flake shape with a bulk density of 9 kN / m <3> or less, and 40:60-60:40 by weight You just need If the coal ash is less than this, the permeability coefficient does not become large enough. If the sandy soil is more than this, the bulk density is large and the air transportability is not large enough, so that the increase in the permeability coefficient is not significant.

Since the drainage material obtained in this way is excellent in the air conveyance property, the inside of the conveyance pipe 16 is compressed by air, it blows off from the exit of the conveyance pipe 16, it can fly in the air, and it can deposit by air pressure over a wide range, The sand mat layer 22 can be formed by layering on the surface of the soft landfill ground 21 with very good workability.

The sand mat layer 22 is sufficiently strong enough to support the sand drain construction machine and the like, and has a large permeability coefficient.

In the present invention, since the sand crushed and the coal ash in advance can be made into a drainage material having a predetermined bulk density of 9 kN / m 3 or less in advance, a drainage material having excellent air transportability can be obtained. By flying and depositing, a sand mat layer can be formed with very good workability.

In addition, the mixing apparatus 30 in the case of manufacturing such a drain material is not limited to the apparatus mentioned above, A conventionally well-known various apparatus can be used.

Another example of the mixing device 30 is shown in FIGS. 4 to 6. 4 is a belt conveyor mixing apparatus 30A disclosed in, for example, Japanese Patent Application Laid-Open No. 63-217015, in which raw materials conveyed by a plurality of belt conveyors 301 and 302 are damper chutes 303, respectively. Through the other belt conveyor 304 to fall in a mixed state, so that the mixed mixture is conveyed to the belt conveyor (304).

In addition, FIG. 5 is the gravity-fall type mixing apparatus 30B disclosed by Unexamined-Japanese-Patent No. 10-280471, for example, it is thrown in from the hoppers 311 and 312, and conveyed by the belt conveyors 313 and 314. When the raw material is introduced from the upper portion of the mixing vessel 315, it is allowed to collide by mixing with a block plate (not shown) of various shapes while falling downward, and the mixture is dropped on the belt conveyor 316 disposed below. .

6 is an example of what is called a ladder ladder type | system | group especially excellent as a gravity mixing container, For example, it is disclosed by Unexamined-Japanese-Patent No. 2001-182094. The mixing vessel is provided with, for example, a plurality of stages of a baffle plate 322 rotatable with respect to the inner wall and supported by an elastic member in the mixing vessel 321 of the cylindrical vessel.

(Example 1)

Next, the Example which added clinker ash with respect to a mountain sand in predetermined ratio, crushed-mixed using the above-mentioned rock ladder mixing apparatus, and obtained the drain material is shown.

Drainage was prepared by mixing acid sand (water content 10%) and clinker ash in a wet weight ratio of 1: 1. In addition, below, Clinker ash is described with C and mountain sand as S. FIG.

(Comparative Example 1 and Comparative Example 2)

Next, acid sand and clinker ash are mixed at 3: 1 and 1: 3, and the wastewater obtained by crushing mixing using the above-mentioned rock ladder mixing apparatus is referred to as Comparative Example 1 and Comparative Example 2, respectively.

(Test example)

According to the bulk density of the manufactured drainage material and the weight ratio distribution for each conveyance distance by air, the air transportability of the manufactured drainage material was evaluated. These results are shown in FIG. 7 and FIG. In addition, Table 1 shows the weight ratio of the air pumped distance.

Moreover, the result of having measured the permeability coefficient is shown in FIG. On the other hand, the measurement of the permeability coefficient is according to the hydrostatic permeability test (JIS A 1218).

C: S Compounding cost 1: 3 Comparative Example 1 1: 1 Example 1 3: 1 Comparative Example 2 Bulk density (kN / ㎥) 10.25 8.76 8.15 Distance (cm) Weight ratio by distance (%) 45 61 15 14 90 26 50 42 135 10 22 21 180 4 8 13 225 0 3 7 270 0 2 4

As shown in FIG. 9, the bulk density of the mixed material tends to decrease as the mixing ratio of the clinker ash increases, but Comparative Example 2 in which C: S = 3: 1 compared to Example 1 in which the mixing ratio of both is 1: 1. It can also be seen that the increase in volume specific gravity is not remarkable.

On the other hand, from the result of the weight ratio by distance according to air conveyance shown in FIG. 8, although the conveyability of Example 1 whose mixing ratio is 1: 1 compared with the comparative example 1 is remarkably large, the comparative example of C: S = 3: 1. In 2, the big improvement of conveyability is not observed. Moreover, although the permeability coefficient of Example 1 whose mixing ratio is 1: 1 is large compared with the comparative example 1 which also has a permeability coefficient C: S = 1: 3, in the comparative example 2 with C: S = 3: 1, No significant improvement in the coefficient is observed.

As a result, it can be seen that the blending ratio of sandy soil and clinker ash is generally 1: 1, that is, between 40:60 and 60:40.

1 is a view schematically showing an example of an apparatus for practicing the present invention.

2 is a schematic cross-sectional view of the mixing device of FIG. 1.

3 is a diagram schematically showing a cross section of the main part of FIG.

4 is a view schematically showing a mixing apparatus according to another example.

5 is a view schematically showing a mixing apparatus according to another example.

6 is a view schematically showing a mixing apparatus according to another example.

7 is a view showing the bulk density of the mixed material.

8 is a view showing the result of the weight ratio by distance according to the air conveyance.

9 is a diagram showing the permeability coefficient of the mixed material.

[Description of the code]

11... Sand pump

12... Loam pipe

14... Hopper

15... Temporary storage

16... A return pipe

17... Air pump

21... Soft landfill ground

22... Sand mat layer

30, 30A, 30B... Mixing device

31... Casing

32... support fixture

33... A standing wall

34... Support roller

35... Longitudinal Processing Vessel

36... rail

37... Gear

38... Electric motor

39... Pinion

40... Top cover

41... bearing

42... Axis of rotation

43.. Attachment

44... Rotating member

45, 47... Pulley

46... Electric motor

48... Drive belt

50... scraper

51... Deodorization member

52... Crankshaft

53... Electric motor

54... Crank

55... Upper chute

56... Lower chute

Claims (7)

Sandy soil and coal ash in a weight ratio of 40:60 ~ 60:40 drainage characterized in that mixed. The method of claim 1, And a permeability coefficient of the drainage material is 10 times or more relative to the permeability coefficient of the sandy soil. The method of claim 2, And a permeability coefficient of the drainage material is greater than 0.1 cm / sec. The wastewater treatment method in any one of Claims 1-3 is used. And mixing sand and coal ash in a weight ratio of 40:60 to 60:40 to form a drain material, and forming a sand mat layer on the soft ground by air conveying the waste material onto the soft ground. Drainage method. The method of claim 5, And a water permeability of the drainage material is greater than 0.1 cm / sec or 10 times or more relative to the permeability coefficient of the sandy soil. The method of claim 6, Drainage method characterized in that the water permeability coefficient of the drainage is greater than 0.1 cm / sec.

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