JP2002177760A - System for mixing powdery solidifying material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system for mixing powdery solidifying material in which simple equipment manufactured at a low cost can be used and the powdery solidifying material can homogeneously be added by a fixed amount and is prevented from being discharged to the atmosphere as fine particles. SOLUTION: This system comprises a measuring unit 11 for measuring the weight of the solidifying material of a solid state and supplying it to a powder supplying unit 12, the unit 12 for cutting out the supplied solidifying material continuously by a fixed amount while the back pressure is prevented from being generated when the supplied solidifying material is transferred pneumatically, a solidifying material adding unit 13 for forcibly injecting the cut-out solidifying material of the solid state into muddy soil or the like in the middle of forcible transfer together with a small quantity of high pressure water by spouting the high pressure water into the vicinity of the cut-out solidifying material by making good use of an ejector effect and a line mixer 14 for kneading the solidifying material-injected muddy soil during pneumatic transfer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder solidification material mixing system, and more particularly, to a powder solidification material mixing system for mixing a solidified material into mud or the like as powder in a pipe.

[0002]

2. Description of the Related Art Conventionally, a solidifying material such as cement is added to mud or the like being pneumatically fed from a pneumatic ship or pneumatic pump through a mud pipe to form a plug flow in the mud pipe or a mud pipe. 2. Description of the Related Art A mixing and solidifying treatment method in a pipe in which mud and the like and a solidifying material are kneaded by a line mixer provided on the way is known.

In the in-pipe mixing and solidification method, it is necessary to mix mud and the like with the solidifying material at a fixed ratio, and it is important to control the amount of mud sent and the amount of solidifying material added. When the solidified material is injected and added into a mud pipe, generally, the solidified material is slurried into cement milk at a ratio of water 1 to cement 1 and injected. In order to obtain the same strength as in the above case, it is necessary to increase the amount of cement by about 10%.

[0004] A fixed amount of the powdered solidified material is cut out by a continuous powder supply method such as a batch method using a blow tank, a rotary feeder cutting and pneumatic flow method, or a revolver chamber and a pneumatic flow method. Conveyed.

In order to inject the powder into the pressure feed pipe, a method in which the powder conveyed by air is injected into an open-type continuous mixer portion found in a ship or a machine dedicated to solidification treatment, and thereafter, the air is fed by air. There is a method in which a pipe having an enlarged portion is connected in the middle of an air pressure pipe for pumping mud, etc., and the powder (solidified material) fed by air is forcibly injected and added by an air ejector to the pipe. .

[0006]

However, many methods have been adopted for slurrying and pouring a solidifying material such as cement, but the method of adding the solidifying material as powder is rarely used. This is for the following reasons.

[0007] In the case of the conventional metering device, compressed air is required for cutting out and pumping the powder, which causes a pressure difference between the material input hopper section and the lower pumping pipe. For this reason, a mechanism for protection is provided, but this part requires a very expensive and extremely consumable complicated mechanism called an air seal for the sliding portion. Further, a pressurized tank mechanism is required to prevent the air pressure for pressure feeding from affecting the weighing hopper or the like as a back pressure.

Further, in the method of injecting the powder into the continuous mixer in advance, it is difficult to uniformly add the powder to the mud or the like, and as a result, the dispersion of the mixing becomes large.

Further, in the method of injecting the powder into the expansion pipe provided in the middle of the pressure feeding pipe, it is difficult to reliably add the powder to the mud plug, and the powder is also added to the air portion of the plug flow. Therefore, the powder reaches the discharge portion without being completely mixed with the mud and the like. If the powder added to the air portion is released into the atmosphere, it will have an adverse effect on the environment.

[0010] It is an object of the present invention to provide a simple and inexpensive facility, to enable uniform and quantitative addition of a powdered solidified material, and to make the powdered solidified material as dust in the atmosphere. It is an object of the present invention to provide a powder solidifying material mixing system which prevents the solidified material from being discharged to the air.

[0011]

In order to achieve the above object, a powder solidification material mixing system according to the present invention comprises a method of injecting a solidification material into mud or the like and kneading the solidified material with the mud or the like. In the material mixing system, a measuring device for measuring and supplying the solidified material as powder, and a powder for continuously cutting out the solidified material by a predetermined amount while preventing a back pressure caused by air pressure feeding of the supplied solidified material. By ejecting high-pressure water around the body supply device and the cut solidified material,
The solidifying material, with the high-pressure water forcibly in the form of powder using the ejector effect, a solidifying material addition device for injecting into the mud and the like being pumped, and the mud and the like into which the solidifying material has been injected are pneumatically fed. A kneading line mixer.

With the above structure, the solidified material measured and supplied as powder is cut out continuously by a fixed amount while preventing the back pressure caused by air pressure feeding, and high-pressure water is circumscribed around the cut solidified material. Is injected into the mud and the like being pumped together with the high-pressure water as powder using the ejector effect, and the mud and the like into which the solidified material has been injected are kneaded during the pneumatic pumping. As a result, the equipment can be manufactured simply and at low cost, and the powdered solidified material can be added uniformly and quantitatively, and the powdered solidified material is released to the atmosphere as dust. Can be prevented.

[0013]

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

FIG. 1 is an overall configuration diagram of a powder solidification material mixing system according to an embodiment of the present invention. As shown in FIG. 1, the powder solidification material mixing system 10 includes a measuring device 1
1, a powder supply device 12, a solidifying material addition device 13, and a snake mixer 14 (manufactured by Saeki Construction Industry Co., Ltd.) which is a line mixer.

The weighing device 11 has a solidified material silo 15, a bag filter 16, and a pair of weighing hoppers 17a, 17b. Each of the pair of weighing hoppers 17a, 17b has a weighing device (load cell) 18a, 18b. Provided.

In the solidified material silo 15, cement as a solidified material is stored as powder, and the solidified material in the silo is sent out to one of the weighing hoppers 17a and 17b via a switching valve 19. It is stored. The switching valve 19 can switch to the other weighing hopper 17b (17a) when one of the weighing hoppers 17a (17b) reaches a certain amount.
The solidified material stored in (17b) is sent to the powder supply device 12.

The amount of the solidified material in the weighing hopper 17 is measured at any time (for example, in units of 0.5 seconds) in accordance with the decrease in weight by the measuring devices 18a and 18b. The addition amount is automatically calculated and managed.

The powder supply device 12 includes a powder pressure feeding / injection pump 20, an air dryer 21, an air flow controller 22,
And a compressor 23. The powder to be pressure-fed is cut out by the powder pressure feeding / injection pump 20 at regular intervals and continuously fed.

The powder pressure feed pump 20 is driven by an inverter motor 24 to continuously divide the supply path of the powder solidification material into isolated and sealed sections so that the powder solidification material on the supply path is divided into the sections. Cut out a fixed amount corresponding to.
A squeeze pump, for example, a tube pump, is used as such a powder pressure pump 20.

Therefore, the solidified material sent out from the weighing hopper 17 passes through the powder pressure injection pump 20,
The powder is cut out in a fixed amount and continuously sent to the solidifying material adding device 13.

From the weighing hopper 17 to the powder pressure feeding injection pump 2
Solidification material inflow path 20a and powder pressure injection pump 2
A compressor 23 is connected via an air dryer 21 and an air flow rate controller 22 to a solidified material outflow path 20b from 0 to the solidified material adding device 13. The air flow controller 22 can control the flow rate of dry air sent into the solidified material inflow path 20a and the solidified material outflow path 20b.

In the powder supply device 12, the number of rotations of the powder pressure feeding / injection pump 20 for performing fixed amount cutting is automatically controlled based on the measurement by the measuring device 18.

Further, by using a squeeze type pump as the powder pressure feed injection pump 20, the back pressure to the measuring hopper 17 can be easily prevented without providing a complicated air seal mechanism accompanying the air pressure feed of the powder solidified material. be able to.

The solidifying material adding device 13 has a water solidifying type powder solidifying material injection pipe 25 and a high-pressure jet pump 26. The solidifying material adding device 13 converts the solidified material into a supplied soft mud such as dredged soil. Inject into body.

The powder solidification material injection pipe 25 is formed in a cylindrical shape having both ends open and is disposed in a horizontal state, and has a mud pressurizing pump 2 for pressurizing supplied mud or the like at one end thereof.
7 is connected to a snake mixer 14 at the other end. An air compressor 28 for sending compressed air for conveying mud or the like to which the powder solidifying material is added is connected to a substantially central portion of the powder solidifying material injection pipe 25.

As for the mud and the like that are pressure-fed through the conveying path of the tube 29 by the powder solidification material injection pipe 25, the mud and the like move while the entire tube is sealed with the mud and the like and pressure is applied. Under such a condition, when injecting the powder solidification material, "inject the powder solidification material as much as possible in the center of the tube" and "inject the powder solidification material in a fixed amount" It is desirable that each requirement is satisfied.

By the way, when the powder solidified material fed by air is injected into the pipe by air pressure, it is difficult to feed the powder solidified material only by air pressure because the pressure in the pipe is high. Therefore, it is conceivable to use an ejector effect by high-pressure air separately prepared in the vicinity of the injection port of the solidified powder, but it is difficult to cut only the air into the soil or the like sealed in the pipe with air alone.

FIG. 2 shows the powder solidification material injection pipe of FIG.
(A) is a structural explanatory view, (b) is an arrangement explanatory view of a high-pressure water jet nozzle. As shown in FIG. 2, the powder solidification material injection pipe 25 includes a pipe 29, and an injection section 30 connected to the pipe 29.
And pressure air pipe 31 and four high-pressure water jet nozzles 3
2 (see (a) and (b)). The injection section 30 and the compressed air pipe 31 are both formed thinner than the pipe body 29.

The tube 29 comprises a first straight portion 29a, a second straight portion 29b, and an inclined portion 29c connecting the two straight portions 29a and 29b almost in parallel in a stepped manner.
In the vicinity of the connecting portion between the a and the inclined portion 29c, the injection portion 30 is provided along the axial direction of the inclined portion 29c, and in the vicinity of the connecting portion between the inclined portion 29c and the second linear portion 29b, the axial direction of the second linear portion 29b is provided. Are respectively arranged along (see (a)).

The injection section 30 is connected to the solidified material outflow path 20b of the powder pressure injection pump 20 (see FIG. 1).
And send it. The compressed air pipe 31 is connected to an air compressor 28 via a check valve 33 provided in the middle of the pipe (see FIG. 1), and sends compressed air for compressed feed from the air compressor 28 to the pipe body 29.

When this compressed air is sent into the pipe body 29, the mud and the like move to the front of the pipe and the pressure of the mud and the like to which the powder is added is reduced, so that the powder solidifying material can be easily injected. .

Each of the four high-pressure water jet nozzles 32 is connected to a high-pressure jet pump 26 (see FIG. 1), and sends high-pressure water from the high-pressure jet pump 26 to the pipe 29 as high-pressure jet water. Each of the high-pressure water jet nozzles 32 is substantially equally spaced around the injection section 30 (see (b)) to expose the respective jet outlets in the pipe body 29 and to set the respective jet directions to the inclined portions 29c. (See the dotted line (a)).

The high-pressure water jet nozzle 32 is
It is provided for mixing the solidified material into the mud and the like which is pressurized and fed by the mud pressurizing pump 27 in the inside 9 as powder.

The high-pressure water jet nozzle 32 forcibly mixes the powder solidified material conveyed by air into mud and the like cut with high-pressure water, and uses a small amount of high-pressure water to form the powder solidified material. A small amount of water is added to make the powder solidified material easily contact with mud or the like. The injection port at the tip of the nozzle can freely adjust the injection angle of the high-pressure water from a narrow line shape to a wide smoke screen shape.

As described above, by utilizing the power of the high-pressure water jetted from the high-pressure water jet nozzle 32, the powder solidification material is applied to the pressurized mud or the like in a sealed pipe due to a strong water wedge effect. It can be forcibly injected. Furthermore, by placing the powder solidification material in the flow of high-pressure water, a negative pressure is generated using the ejector effect of high-pressure water,
The powder solidified material can be smoothly drawn and taken into the pipe.

FIG. 3 is an explanatory view showing another example of the high-pressure water jet nozzle of FIG. As shown in FIG. 3, the high-pressure water jet nozzle 32 is connected to the pipe connecting part of the injection part 30 such that the jetting direction is along the axial direction of the inclined part 29 c of the pipe 29 (see the dotted line in FIG. 2A). One is installed in the high-pressure water injection pipe 34 attached to the. High pressure water injection pipe 34
Is protruded from the pipe 29 at a predetermined angle (for example, 45 degrees or less).

The high-pressure water jet nozzle 32 attached to the high-pressure water injection pipe 34 jets high-pressure water from the injection port at the tip through the high-pressure water injection pipe 34 toward the inner center of the pipe 29. In the middle of the high-pressure water injection pipe 34, the pipe 29 is substantially orthogonal to the connection with the high-pressure water injection pipe 34,
The injection section 30 is connected to the high-pressure water injection pipe 34 at a predetermined angle.

The high-pressure water injection pipe 34 has an outer diameter D
It is desirable that the relationship be maintained such that the relationship between the pressure and the injection angle of the high-pressure water jet nozzle 32 is kept constant.

FIG. 4 is an explanatory view showing the arrangement of the high-pressure water injection pipe and the high-pressure water jet nozzle shown in FIG. As shown in FIG. 4, the injection unit 30 is provided with a high-pressure water jet nozzle 32.
Is approximately at the center (L / 2) of the distance L from the injection port to the opening of the pipe body 29 of the high-pressure water injection pipe 34, and its mounting angle is approximately 45 degrees or less with respect to the high-pressure water injection pipe 34. It is desirable to have an angle. Under these conditions,
The powder solidification material can be put on the flow of high-pressure water most efficiently.

Further, the relationship between the injection angle α of the high-pressure water from the high-pressure water jet nozzle 32 and the irradiating width B at the opening of the pipe 29 of the high-pressure water injection pipe 34 is shown by the difference between the outer diameter D and the injection width B. d is １ ／ to ５ of the outer diameter D of the high-pressure water injection pipe 34
(D = D / 4-5), the ejector effect can be maximized.

Accordingly, the arrangement of the high-pressure water jet nozzle 32 and the injection angle α are determined so that these relationships can be maintained. The number of high-pressure water jet nozzles 32 is not limited to four or one, and any number may be provided in any arrangement so as to satisfy the above-described requirements. May be formed by an annular slit formed by concentric circles of the tube opening so as to surround the periphery of the tube.

FIG. 5 is an explanatory view of the pulsation preventing means provided in the solidified material outflow passage of FIG. As shown in FIG. 5, a pulsation preventing means 35 for preventing pulsation of the powder solidified material sent out from the powder pressure injection pump 20 is provided in the solidified material outflow path 20b from the powder pressure injection pump 20. .

The powder-solidifying material mixing system 10 uses a squeeze-type pump as the powder-pressure-feeding injection pump 20 for cutting out the powder-solidifying material. Back pressure to the hopper 17 side can be prevented. However, in the squeeze pump, pulsation is unavoidable due to its mechanism.

Since it is desirable that pulsation is not generated as much as possible in order to convey the powdered solidified material at a constant rate, it is desirable that the powdered material injection pump 20 be a part of the solidified material outflow passage 20b which is an outlet of the squeeze pump. Then, the pulsation preventing means 35 is attached.

The pulsation preventing means 35 is formed in a windmill shape having a helically continuous blade portion 35b attached around a rotary shaft 35a. When the powder solidification material is discharged from the tube pump, the portion pressed by the roller 36 of the tube pump becomes a discontinuous flow, and a pulsating portion is generated. However, the movement of the blade portion 35b due to the rotation of the windmill is performed. By slightly slowing down the flow of the powder solidification material, the discontinuous state can be eliminated and pulsation can be prevented.

As described above, according to the present invention, the solidified material is taken in the form of powder by the powder solidified material injection pipe 25, and the solidified material is mixed with the mud, etc., which is being fed to the snake mixer 14 under pressure. Can be combined with Snake Mixer 14
Knead the soft dredging mud etc. and the powder solidifying material through
Mud and the like can be solidified during air conveyance.

That is, high-pressure water is jetted out of the powder solidifying material by a nozzle or a slit to cut the mud or the like in the wet state, and forcibly use the ejector effect to remove the solidifying material such as cement. Inject into mud etc. at a predetermined pressure as it is.

At this time, in order to prevent the powder solidification material to be introduced from reacting with moisture and adhering to the inner wall of the pressure feed pipe as much as possible, the powder solidification material is discharged to the center as much as possible, such as mud during the pressure feed.

As described above, since the solidified material is taken into the mud or the like at a predetermined pressure as a powder, a simple mechanism is employed when the solidified material such as cement is added to the mud or the like as the powder. The need for an air seal and the need for a pressure tank are eliminated, and the production cost can be reduced by simplifying the equipment.

In addition, high-pressure water is used when adding the powder solidifying material. However, since the amount of water used is small, the strength of the solidified soil does not decrease as compared with the case where slurry is added. Further, since the powder solidification material is injected into the pipe together with the high-pressure water and added to the mud or the like, dust can be prevented from being generated when the powder solidification material is added to the mud or the like.

In the case of solidifying the soft dredged soil in the form of slurry, the slurry is generally slurried in the form of cement milk at a ratio of water 1 to cement 1 as a solidifying material and injected. If only the above cement can be injected, the amount of cement for obtaining the same strength when solidified can be reduced by about 10% or more.

[0052]

As described above, according to the present invention, the solidified material weighed and supplied as powder is cut out continuously by a fixed amount while preventing the back pressure caused by air pressure feeding.
By ejecting high-pressure water around the cut solidified material, the ejector effect is used to forcibly inject the powdered high-pressure water together with the high-pressure water into the mud being pumped, etc. Is kneaded during pneumatic feeding, so that the equipment can be manufactured simply and inexpensively, and the powdered solidified material can be added uniformly and quantitatively. Can be prevented from being released.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a powder solidification material mixing system according to an embodiment of the present invention.

FIGS. 2A and 2B show the powder solidification material injection pipe of FIG. 1, wherein FIG. 2A is a structural explanatory view, and FIG. 2B is an arrangement explanatory view of a high-pressure water jet nozzle.

FIG. 3 is an explanatory view showing another example of the high-pressure water jet nozzle of FIG. 2;

FIG. 4 is a layout explanatory view showing a layout relationship between a high-pressure water injection pipe and a high-pressure water jet nozzle in FIG. 3;

FIG. 5 is an explanatory view of a pulsation preventing means provided in a solidified material outflow passage of FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 powder solidification material mixing system 11 measuring device 12 powder supply device 13 solidification material addition device 14 snake mixer 15 solidification material silo 16 bag filter 17a, 17b measuring hopper 18a, 18b measuring device 19 switching valve 20 powder pressure feeding injection pump 20a Solidification material inflow passage 20b Solidification material outflow passage 21 Air dryer 22 Air flow controller 23 Compressor 24 Inverter motor 25 Powder solidification material injection pipe 26 High pressure jet pump 27 Mud pressurizing pump 28 Air compressor 29 Tube 29a First straight portion 29b Second Linear part 29c Inclined part 30 Injection part 31 Pressurized air pipe 32 High-pressure water jet nozzle 33 Check valve 34 High-pressure water injection pipe 35 Pulsation prevention means 35a Rotating shaft 35b Blade part 36 Roller B Radiation width D Outer diameter L Distance d Difference α Injection angle

Claims (5)

[Claims] 1. A powder solidifying material mixing system for injecting a solidifying material into mud or the like and kneading the mud or the like with the solidifying material, a measuring device for measuring and supplying the solidifying material as powder. A powder supply device that continuously cuts out the solidified material by a predetermined amount while preventing a back pressure caused by pneumatic feeding of the solidified material, and by blowing high-pressure water around the cut solidified material, A solidifying material adding device for forcibly injecting the solidified material together with high-pressure water as a powder using the ejector effect into the mud being pumped, and kneading the mud etc. into which the solidified material has been injected during pneumatic pumping And a line mixer. 2. The weighing device according to claim 1, further comprising a weighing device for measuring the amount of the solidified material stored in the hopper as a powder in a clockwise manner in accordance with a decrease in weight, and determining an amount of the solidified material added to the mud or the like based on the measurement result. 2. The powder solidification material mixing system according to claim 1, wherein a fixed amount is injected by automatically calculating and managing. 3. The powder supply apparatus according to claim 1, wherein the supply path of the solidified material is continuously divided in each of the isolated and sealed sections, so that the solidified material on the supply path is cut out by a predetermined amount corresponding to the section. The powder solidification material mixing system according to claim 1 or 2, wherein: 4. The solidifying material adding device includes a high-pressure water jet nozzle for feeding high-pressure water into a pipe to which the mud and the like are pumped, and mixes the solidified material into the mud and the like under pressure as powder. The powder solidification material mixing system according to any one of claims 1 to 3, further comprising a powder solidification material injection pipe. 5. An injection section for injecting the solidified material into the tube so that a jet port is directed toward the inside of the tube and the jetting direction is along the axial direction of the tube. The powder solidification material mixing system according to claim 4, wherein the powder solidification material mixing system is installed in a space.