JP2000345577A - Soil-sand improving and transport plant, and improved transport ship for dredged material using the plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved transport ship for dredged materials in which improved soil and sand of superior quality are obtained by largely enhancing the mixing performance of dredged materials and an improvement agent without sacrificing the transportation efficiency of dredged materials. SOLUTION: Screens 3, 4 for removing foreign matters from pumped-up sludge, an agitator 5 for uniforming the moisture of sludge by agitation in the lower sections of the screens, a conveyor 6 for forwarding dredged materials at every fixed quantity from the agitator, a main transport path 7, into which dredged materials are flowed from the conveyor, a first mixing transport path 8 in which one end is connected to the main transport path and primary mixing is conducted, and a second mixing transport path 9, in which one end is connected at the other end of the first mixing transport path, the other end is extended up to a remote place and connected to a supply port for the remote place and secondary mixing is conducted, are loaded on the ship. A force-feed pump device 10 is set up on the conveyor side on its midway to the main transport path, an improvement-agent injection section 11 is fitted to the main transport path in the vicinity of the first mixing transport path, a compressed- air supply section 12 is installed on the upperstream side of the second mixing transport path.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil improvement / transportation plant suitable for improving the properties of dredged soil in harbors, lakes, rivers, etc. and transporting it to remote locations, and a dredged soil using this plant. Related to improved transport vessels.

[0002]

2. Description of the Related Art For example, a construction method in which soil dredged with a backhoe or a grab bucket in a harbor is pumped to a landfill by a transport pipe has been conventionally performed.

According to the transport of dredged soil by this method,
Sediment can be transported more efficiently than slurry transport, continuous transport can be transported compared to soil transport, and more fluid sediment can be transported than belt conveyor transport. There is a big one.

By the way, if the above-mentioned dredged soil is directly dumped into a landfill, it takes a long time to dry and solidify it, leaving a problem in land use. For this reason, even if a site for drying and solidifying the dredged soil is secured, it is necessary to give due consideration to the impact on the surrounding environment.

[0005]

Accordingly, recently, an improved dredged soil transport ship has been developed in which a cement solidifying agent (improving agent) is mixed with the dredged soil and pumped to a landfill as fast-hardened improved soil.

[0006] In this work boat, for example, earth and sand dredged by a backhoe are dropped into a stirrer through a screen for removing foreign matter, and the stirred earth and sand in the stirrer is pushed into a transport pipe, and transported from a compressed air source through an air supply pipe. The sediment is transported by the propulsion force (pneumatic feeding) of the compressed air supplied to the pipe, and the improver is injected into the pipe in the middle of the transport pipe to disturb the plug flow (massive flow) in the soil and improver in the transport pipe. By generating a flowing state, the dredged soil and the improving agent are mixed and transported to the landfill.

[0007] However, the method of mixing the dredged soil and the improving agent in the transport pipe by pneumatic pressure feeding has a large variation in mixing performance when the dredged soil and the improving agent are intermittently flowing and the flow rate changes. It is difficult to constantly change the properties of dredged soil into high quality improved soil. In particular, if the dredged soil is highly viscous, it becomes a lump that is difficult to divide,
There is a problem that the improving agent is hard to enter therein and the mixing action is difficult. Therefore, it is conceivable to install a kneading device in the work boat, knead the dredged soil and improver sufficiently with this kneading device, and then supply it to the transport pipe. There is a possibility that the transportation efficiency is greatly reduced and the equipment on the work boat is enlarged.

The present invention has been made in view of the above circumstances, and greatly improves the mixing performance of a dredged soil and an improving agent without sacrificing the transport efficiency of the dredged soil to obtain high-quality improved soil and equipment. It is an object of the present invention to provide a soil improvement / transportation plant capable of reducing the size of a sediment, and an improved dredged soil transportation ship using the plant.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a soil improvement / transportation plant according to the present invention comprises an improver injection section for injecting an improver into earth and sand, while mixing the soil and the improver. A mixed transport route for continuously transporting the mixed transport route to a remote location, wherein the mixed transport route is a first mixed transport route and a second mixed transport route.
And the first mixed transport path is connected in series, and the first mixed transport path has an inlet at one end and an outlet at the other end, and has a cross-sectional shape from the inlet to the outlet. A plurality of deformation paths that change continuously and extend in the axial direction;
Confluent dividing means provided between the inlet and the outlet of each of the deformed passages to merge and divide the materials passing through the deformed passages, wherein the earth and sand continuously charged by pumping And the transport agent to transport while mixing by passing the improving agent through each of the deformed passage toward the outlet portion, the second mixed transport path,
It is characterized in that a transport path is provided in which compressed air is supplied into the transport pipe to generate a plug-like flow in the earth and sand and the improver, and transport the mixture while mixing.

According to this plant, the primary mixing action by the continuous convection phenomenon of the first mixing transport path performs the primary mixing action of the dredged soil and the improving agent, and the primary mixing action is performed in series with the first mixing transport path. The secondary mixing of the dredged soil and the improving agent is performed by the continuous plug-shaped turbulent flow of the second mixing transport path, which converts the dredged soil into high-quality improved sediment and continuously to a remote place. It will be possible to transport to.

The first mixing and transporting path is generally constituted by connecting a plurality of elements in series with each other, and each of the elements is connected to an inlet end, an outlet end, and the inlet end to the outlet end. With a plurality of deformation passages, the arrangement pattern of the inlet portion of each deformation passage formed at the inlet end and the arrangement pattern of the outlet portion of each deformation passage formed at the outlet end are different, further, Each of the elements is
The outlet end and the inlet end of the adjacent element are connected in close contact with each other, and the earth and sand and the improver continuously supplied from the element at one end by pumping are connected to the connection side end of each element. At the connection between the inlet and the outlet of each of the deformed passages in the section, they are combined and divided while being mixed and transported toward the element at the other end.

[0012] The earth and sand and the improving material are repeatedly divided and merged by each element, and are finely divided and mixed in layers. Therefore, even if the earth and sand and the improving material before passing through the first mixed transport path are in a highly viscous state, they are forcibly subdivided by the respective elements after passing through the first mixed transport path to form the second mixed transport path. Sent. Thereby, the mixing effect in the second mixing transport path is significantly improved.

The second mixing / transporting path is a pipe having a circular cross section. The second mixing / transporting path is connected after the first mixing / transporting path, and generates a plug-like flow at this portion to convey while mixing. I try to go. By making the entire second mixed transport path a normal pipe in this way, it becomes possible to carry out improved soil transport more smoothly as compared with existing devices in which a static mixer or the like is provided in the middle. .

An improved transport vessel for dredged soil using the soil improvement / transport plant of the present invention is an improved transport of dredged soil for improving the properties of the dredged soil in ports, lakes, rivers, rivers, etc. and transporting it to remote locations. A ship, on the ship, a screen for removing foreign matters from the mud pumped by the mud pumping means, a stirrer disposed below the screen to stir the water content of the mud by stirring, and a stirrer. A conveyor for feeding the dredged soil at a constant rate, a main transport path into which the dredged soil sent out by the conveyor flows, the first mixing transport path having one end connected to the main transport path to perform primary mixing, One end is connected to the other end of the first mixing / transporting path, and the other end is extended to the remote location and connected to its supply port to perform secondary mixing of the second mixing / transporting path. And is equipped with At the same time, a pumping pump device for pumping the dredged soil and sand toward the first mixing transportation path is provided on the conveyor side in the middle of the main transportation path, and a main transportation path near the first mixing transportation path is provided. An improving agent injecting unit for injecting the improving agent into the dredged soil is provided, and on the upstream side of the second mixing and transporting path, a compressed air supply unit for supplying compressed air to the inside is provided. I have.

According to the improved dredged sediment transport ship, the long second mixed transport route utilizing compressed air occupies most of the entire length of the transport route, and the second mixed transport route dredges the dredged material. Sediment can be transported continuously to remote places in a short time. In addition, the pumping pump device mounted on the ship only needs to have a pumping capability for pumping the dredged soil into the first mixing / transporting path, so that the pumping device becomes a small device.

[0016]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an improved transport vessel 1 for dredged sediment, and a driving method for placing dredged soil that has been improved and continuously transported on a seabed near a landfill L far from the improved transport vessel 1. 2 shows a boat 2.

The improved dredged soil transport ship 1 includes a primary screen 3 and a secondary screen 4 for removing foreign matter from soft mud pumped by a mud pumping means such as a backhoe or a grab bucket (not shown), and a lower portion of the secondary screen 4. And a screw conveyor 6 for distributing the dredged soil with a constant amount, and a dredge sent out by the screw conveyor 6. A main transport path 7 into which sediment flows, a primary mixing transport path 8 having one end connected to the main transport path 7, and a secondary mixing transport path having one end connected to the other end of the primary mixing transport path 8. 9 is mounted.

On the screw conveyor 6 side of the main transport path 7, there is provided a pumping pump device 10 for pumping the dredged soil toward the primary mixing transport path 8. A cement slurry injection port 11 for injecting a cement slurry (hereinafter, referred to as an “improvement agent”) from a not-shown improvement agent tank into the dredged soil in the transport path 7.
Is provided between the primary mixing transport path 8 and the secondary mixing transport path 9, and there is provided a compressed air supply port 12 for sending compressed air from a compressed air source (not shown) toward the secondary mixing transport path 9. ing.

The secondary mixing transport path 9 is a long pipe, most of which extends to the casting boat 2 while being floated and supported on the sea surface by a floater or the like, and the other end is cast. It is connected to the sediment receiving port of the ship 2. In addition, the member arranged in the middle of the main transport path 7 indicated by the reference numeral 13 in FIG. 1 is an electromagnetic flow meter that measures the flow rate of the dredged soil and sand that is being fed to the primary mixing transport path 8. Further, the primary mixed transport path 8 corresponds to a first mixed transport path of the present invention, and the secondary mixed transport path 9 corresponds to a second mixed transport path of the present invention.

The primary mixing transport path 8 is basically constituted by connecting two types of elements 21A and 21B alternately in total of seven. FIG. 2 shows a state in which two types of elements 21A and 21B are connected for convenience of explanation. First, one type of element 21A has square end portions, and both end portions correspond to the element. Are formed.

A plurality of bolt holes f1 are formed in the flanges F, F, and adjacent elements are connected to each other by bolting the ends thereof using the bolt holes f1. The element 21A has two deformation passages 22, 23 arranged side by side in the same direction. At one end of the element 21A, a partition wall 24 is provided at the center so as to form a vertically long opening on the left and right.

The vertically long left and right openings have two deformation passages 2.
2 and 23, respectively. At the other end of the element 21A, a partition wall 25 is provided at the center so as to form a horizontally long opening vertically. The horizontally elongated upper and lower openings are formed at the respective outlet portions 2 of the two deformation passages 22 and 23.
2b and 23b. That is, the partition wall 24 at the entrance end of the element 21A and the partition wall 25 at the exit end are arranged so as to be different from each other by 90 degrees.

Therefore, the arrangement pattern of the two entrances 22a, 23a of the deformed passages 22, 23 is such that rectangular openings are formed side by side, and the two exits 22b,
In the arrangement pattern 23b, rectangular openings are formed vertically. The cross sections of the deformed passages 22 and 23 are continuously changed from the inlets 22a and 23a toward the outlets 22b and 23b.

Regarding the mode of the change, each deformation passage 2
For both 2 and 23, the cross-sectional area at any position is the inlet 22a,
The same applies from 23b to outlets 22b and 23b, and only the cross-sectional shape changes continuously. That is, the entrance 2
2a and 23a are rectangles long in the X direction,
The cross-sectional shape is a square in the middle of the outlets 22a and 23b and the outlets 22b and 23b. The outlets 22b and 23b are formed so as to be rectangular in the Y direction perpendicular to the X direction. Then, the deformed passages 22, 2
3 have the same length.

Accordingly, the cross-sectional shape of the dredged soil and the improving agent passing through each of the deformed passages 22 and 23 is changed from a rectangle long in the X direction to a square, and then gradually changed to a rectangle long in the Y direction. Will be. In the element 21A, an inlet 22a located on the left side in FIG.
The inlet 23 a located on the right side and the outlet 23 b located below communicate with each other through the deformed passage 23.

Next, another type of element 21B
Is basically the same as the above-described element 21A, but in this element 21B, an inlet 26a located on the left side as viewed in FIG. And an outlet 27b located above communicate with the deformed passage 27. That is, this element 21B is
The communication mode between 1A and each inlet and each outlet of each deformed passage is different.

Therefore, two types of elements 21A,
21B, the outlet 22b of the deformation passage 22 in one element 21A is connected to the other element 21A.
B communicates with a half of the inlet 26a of the deformed passage 26 and a half of the inlet 27a of the other deformed passage 27, and the outlet 23 of the deformed passage 23 in one element 21A.
b communicates with the other half of the inlet 26a of the deformed passage 26 in the other element 21B and the other half of the inlet 27a of the other deformed passage 27.

Therefore, the dredged soil and half of the improving agent, which have passed through each of the deformed passages 22 and 23 in one element 21A, enter the respective deformed passages 26 and 27 of the other element 21B to substantially merge. However, when looking at the dredged soil and improving agent passing through one deformation passage, the connection between the two elements is divided in half.

Therefore, the two elements 21A, 2A
The outlets and the inlets of the deformed passages formed at the outlet side end and the inlet side end, which are the connection portions of 1B, constitute the merging and dividing means for the dredged soil and the improving agent. If such elements 21A and 21B are connected alternately in series as shown in FIG. 1, a confluent dividing means for the dredged soil and the improving agent is formed at each connection.

The secondary mixing transport path 9 is a long transport pipe 29 extending between the primary mixing transport path 8 and the casting boat 2.
Is the subject. The transport pipe 29 has a configuration in which a large number of conventionally used metal pipes having a circular cross section are connected.

According to the improved dredged sediment transport ship 1 having the above-described structure, the soft mud pumped by the mud pumping means is subjected to the primary screen 3 and the secondary screen 4 to remove foreign matter, and is put into the stirring device 5 to be stirred. As a result, dredged soil with reduced viscosity to some extent in the stirring device 5 is obtained. And the dredged soil in the stirring device 5 is sent out by the screw conveyor 6,
It is pressure-fed to the primary mixing transport path 8 side by the pressure pump device 10.

The dredged soil immediately before entering the primary mixing transport path 8 is fed to the primary mixing transport path 8 after being combined with the improving agent injected from the cement slurry injection port 11. Here, the mixing process of the dredged soil and the improver pumped to the primary mixing transport path 8 will be described with reference to the model diagram of FIG. 3.
At the inlet-side end of the first stage element 21A, it enters the two deformed passages 22 and 23, and the flow is eventually changed to A and B.
Is divided into two. Each of the divided bodies of the dredged soil and the improving agent has a rectangular cross section that is long in the X direction.

Next, in the intermediate portion of the first stage, the cross-sectional shapes of the dredged soil and the fluids A and B both change to square, and at the end of the first stage on the outlet side, Both of them change into rectangles elongated in the Y direction which differ from the longitudinal direction X on the inlet side by 90 degrees. Therefore, the cross-sectional shape of each fluid body of the dredged soil and the improving agents A and B changes from a rectangle long in the X direction to a square → a rectangle long in the Y direction.

In the course of this change, each deformation path 2
The inner walls 2 and 23 receive a continuous compression action. As a result, a continuous convection phenomenon occurs, particularly in the radial direction of the cross section, in the fluid itself of the dredged soil and the improving agent, whereby the first primary mixing action is performed.

Next, the partition wall 28 at the entrance end of the second stage element 21B intersects orthogonally with the partition wall 25 at the exit end of the first stage element, so that 1
The dredged earth and sand and the improvers A and B that have come out of the exit end of the stage element 21A are divided into A / B and A / B, respectively, as shown in FIG.

Then, the dredged soil and the improver A / B flow through each of the deformed passages 26 and 27. That is, at the inlet-side end of the second-stage element 21B, the dredged soil and a part of the improving agents A and B merge in the deformed passages 26 and 27, respectively, and the flow of the dredged soil and the improving agent in each passage is changed. Both of the shape cross-sections are rectangles long in the X direction.

Next, in the intermediate portion of the second stage, the cross-sectional shape of the fluid body of the dredged soil and the improving agent A / B is changed into a square shape as a whole, and both ends are in the Y direction at the outlet end. Changed to a long rectangle. Also in the second stage, the dredged soil and the improver A / B change from a rectangle long in the X direction to a square → a rectangle long in the Y direction. Then, in the changing process, the inner wall surfaces of the deformation passages 26 and 27 are subjected to a continuous compression action. As a result, a continuous convection phenomenon occurs in the flow of the dredged soil and the improving agent itself, particularly in the inward and outward directions of the cross section, whereby the second primary mixing action is performed.

Hereinafter, the third to seventh steps are similarly performed in the third step.
The first to seventh primary mixing operations are performed. The dredged soil and the improving agent subjected to the primary mixing action in the primary mixing transport path 8 are passed on to the secondary mixing transport path 9 connected in series to the primary mixing transport path 8.

As shown in FIG. 1, in the secondary mixing and transporting path 9, the mixture (dredged soil and improving agent) fed from the primary mixing and transporting path 8 by the compressed air supplied from the compressed air supply port 12. M) is continuously pumped from the left side to the right side of the transport pipe 29 while performing a secondary mixing action in a turbulent plug-like (lumpy) flow.

Then, the mixture M which has become a plug-like flow
Is transported to the casting boat 2 while the mixing by the secondary mixing action is repeatedly performed according to the length of the secondary transport path 9.

Accordingly, in the present embodiment, the primary mixing action of the primary mixing transport path 8 by the continuous convection phenomenon is performed to perform the primary mixing action of the dredged soil and the improving agent, and the primary mixing transport path 8 is connected in series to the primary mixing transport path 8. The secondary mixing of the dredged soil and the improving agent is performed by the continuous plug-shaped turbulent flow of the secondary mixing transport path 9, and the properties of the dredged soil are changed to high-quality improved sediment. And transported to the casting boat 2 continuously.

The long secondary mixing transport path 9 using compressed air occupies most of the entire length of the transport path. Since it can be transported continuously to the ground, dredged soil transport efficiency can be greatly improved.

A pumping pump device 10 is mounted on the improved dredged soil transport ship 1. The pumping pump device 10 has a pumping capability for pumping the dredged soil into the primary mixing transport path 8. Therefore, a small-sized device may be mounted, thereby suppressing an increase in the size of the work boat.

[0044]

As described above, according to the soil improvement / transportation plant of the present invention, the primary mixing action of the dredged soil and the improving agent is performed by the primary mixing action due to the continuous convection phenomenon of the first mixing transport path. In addition, the secondary mixing operation of the dredged soil and the modifying agent is performed by the continuous plug-like turbulent flow of the second mixing transportation path connected in series to the first mixing transportation path. As a result, the properties of dredged soil can be changed to high-quality improved soil and transported continuously to remote locations.

According to the improved dredged soil transport ship using this soil improvement and transport plant, the long second mixed transport route using compressed air occupies most of the entire length of the transport route. Since the second mixed transport path enables the dredged soil to be continuously transported to a remote place in a short time, the transport efficiency of the dredged soil can be greatly improved, and the pumping pump device is installed on the ship. This pumping pump device may have a small pumping device as long as it has a pumping capability for pumping the dredged soil into the first mixing and transporting path. Increase in size can be suppressed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an improved dredged soil transport ship according to the present invention.

FIG. 2 is a perspective view showing elements constituting a first mixed transport path according to the present invention.

FIG. 3 is a model diagram showing a mixing process of dredged soil and improver being pumped in a first mixing transport path.

[Explanation of symbols]

 Reference Signs List 3 Primary screen 4 Secondary screen 5 Stirrer 6 Screw conveyor (conveyor) 7 Main transport path 8 Primary mixing transport path (first mixing transport path) 9 Secondary mixing transport path (second mixing transport path) 10 Pressure pump Apparatus 11 Cement slurry injection port (improvement agent injection section) 12 Pumping air supply port (pressing air supply section) 21A, 21B Element 22, 23, 26, 27 Deformation passage 22a, 23a, 26a, 27a Inlet sections 22b, 23b, 26b , 27b Outlet 24, 25 Partition wall 29 Transport pipe

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 000172961 Saeki Construction Industry Co., Ltd. 2-4-6 Bingo-cho, Chuo-ku, Osaka-shi, Osaka (71) Applicant 000219406 Toa Construction Industry Co., Ltd. Yonbancho, Chiyoda-ku, Tokyo 5 (71) Applicant 000222668 Toyo Construction Co., Ltd. 4-1-1 Koraibashi, Chuo-ku, Osaka-shi, Osaka (72) Inventor Hiroshi Kato 2nd Tsukiji-cho, Minato-ku, Nagoya-shi, Aichi Prefecture Inside the Fifth Harbor Construction Bureau (72) ) Inventor Ichiu Yamada 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Akira Uchida 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. 72) Inventor Hidehisa Makino 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Takano Ito Kita-Aoyama, Minato-ku, Tokyo Eye No. 2 No. 3 Aoyama buildings Saekikensetsukogyo within Co., Ltd.

Claims (4)

[Claims] An improvement agent injection section for injecting an improvement agent into earth and sand, and a mixing transportation path for continuously transporting the soil and the improvement agent to a remote location while mixing the soil and the improvement agent. A first mixing / transporting path and a second mixing / transporting path connected in series, wherein the first mixing / transporting path has an inlet at one end and an outlet at the other end, And a plurality of deformed passages whose cross-sectional shape changes continuously from the first to the outlet and extends in the axial direction, and each of the deformed passages is provided between the inlet and the outlet of each of the deformed passages. Converging / dividing means for merging and dividing each material passing therethrough, and mixing the earth and sand and the improver continuously charged by pumping by passing through the respective deformed passages toward the outlet. The second mixing Send, sediment improved and transport plant, characterized in that transport pipe by supplying pressurized air into the said sand and transport path to continue to transport with mixing by generating a flow of plug shape modifier. 2. The first mixing and transporting path is configured by connecting a plurality of elements in series with each other, and each of the elements includes an inlet end, an outlet end, and a plurality of elements extending from the inlet end to the outlet end. Wherein the arrangement pattern of the inlet portion of each of the deformed passages formed at the inlet end is different from the arrangement pattern of the outlet portion of each of the deformed passages formed at the outlet end. Each element is connected in close contact with the outlet end and the inlet end of the adjacent element, and the earth and sand and the improver continuously supplied from the element at one end by pumping are supplied to the respective elements. At the connecting end of each of the deformed passages at the connecting end between the inlet and the outlet at the connecting end of the deformed passage, mixes while dividing, and transports toward the element at the other end. 2. The soil improvement and transportation plant according to 1. 3. The soil improvement system according to claim 2, wherein the second mixing / transporting path is a pipe having a circular cross section, and is connected after the first mixing / transporting path. Transport plant. 4. The improvement of dredged soil transported to a remote place by improving the properties of the soil dredged in a port, lake, marsh, river or the like using the soil improvement / transportation plant according to any one of claims 1 to 3. A transport ship, comprising: a screen on a ship for removing foreign matter from the mud raised by mud lifting means; a stirrer disposed below the screen to stir the water content of the mud by stirring; and a stirrer And a main transport path through which the dredged soil sent out by the conveyor flows, and the first mixed transport path, one end of which is connected to the main transport path to perform primary mixing, One end is connected to the other end of the first mixing / transporting path, and the other end is extended to the remote place and connected to its supply port to perform secondary mixing of the long second mixing / transporting path. If some are installed A pumping device for pumping the dredged soil toward the first mixing and transporting path is provided on the conveyor side in the middle of the main transporting path, and a main transporting path near the first mixing and transporting path is provided. An improving agent injection section for injecting the improving agent into the dredged soil is provided, and a pumping air supply section for feeding pumping air into the inside is provided on the upstream side of the second mixing and transporting path. Improved transport ship for dredged soil.