JP3330133B2 - Transfer pipe structure in improved soil casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for transferring a viscous fluidity-improved soil obtained by adding a solidifying material to earth and sand and kneading it from a casting vessel to a water bottom through a transfer pipe and placing it on the water bottom. The present invention relates to a transfer pipe structure in an improved soil casting device.

[0002]

2. Description of the Related Art In harbor works such as reclamation of coastal sea areas and creation of artificial islands, slurry-like fluidity improvement is performed by adding a cement-based solidifying material or water to dredged soil and other soil from the seabed and kneading. The soil is forcibly transported from a kneading facility such as a plant ship to a casting vessel, and the improved soil is allowed to flow down from the casting vessel to the bottom of the disposal site through a transfer pipe. A method of casting and solidifying is conventionally known (for example, Japanese Patent Application Laid-Open No. 2000-12965).
No. 2).

[0003]

In such a known casting method, the improved soil flows down the transfer pipe relatively slowly due to its own viscosity to the bottom of the water.
The transfer pipe is slowly and continuously discharged from the lower end outlet of the transfer pipe and is driven into the water bottom. Conventionally, a substantially straight pipe including the outlet portion is used as the transfer pipe. Therefore, the following problems were found.

[0004] That is, when the improved soil is poured, the improved soil is continuously discharged from the lower end outlet in the transfer pipe. At this time, for example, as shown in FIG. External seawater may slightly enter the vicinity of the inner wall of the transfer pipe from the lower end outlet of the transfer pipe. The infiltrated seawater gradually flows backward along the inner wall of the pipe due to the difference in specific gravity with the improved soil (sediment), and mixes with the improved soil near the inner wall of the pipe to lower its viscosity (see FIG. b)).

[0005] Due to this decrease in viscosity, as shown in Fig. 7 (c), the improved soil near the outlet of the transfer pipe is peeled off from the improved soil on the upper side of the transfer pipe, so that the improved soil is rapidly passed through the pipe (that is, lower than the normal flow speed). At high speed), and the seawater rises backward in the pipe by that amount. As shown in FIG. 7 (d), the raised water tends to penetrate and rise between the improved soil on the upper side and the inner wall of the transfer pipe. It comes off from the soil on the upper side and starts to descend rapidly in the pipe, and the seawater further rises in the pipe by that amount.

[0006] When the above is repeated, the seawater flows back up to a considerably high level in the transfer pipe, and in such a state, the improved soil falling in the transfer pipe is not removed until it reaches the lower end outlet of the pipe. It becomes sufficiently mixed with the large amount of seawater in the pipe, and a considerable amount of sediment separates from the solidified material in the pipe. However, the sediment separation phenomenon in the transfer pipe slows down the speed of solidification of the improved soil (sediment) cast on the water floor, the solidification strength is not sufficient, and a large amount of solidified material released from the soil is poured. It causes problems such as polluting the waters around the disposal site.

[0007] The present invention has been made in view of such circumstances, and by a simple modification of the transfer pipe, the separation of sediment can be effectively suppressed until the improved soil descending in the transfer pipe reaches the water bottom. It is an object of the present invention to provide a transfer pipe structure in an improved soil casting device which solves the above-described problem.

[0008]

In order to achieve the above object, a first aspect of the present invention is a viscous mixture obtained by adding a solidifying material to earth and sand and kneading the mixture.
An improved soil casting device for transferring a flow-improved soil having a flowability downward from a casting vessel to a water bottom through a transfer pipe and placing the soil on the water bottom, wherein the transfer pipe flows down through the pipe. Forming a first inversion flow path portion for inverting the improved soil upward near the outlet of the pipe to flow upward by a predetermined height ;
By the first reversing flow path portion, the transfer tube of the upper stream side than it
To prevent the backflow of water from flowing upward,
At the end, the improved soil that has risen in the first inversion channel portion is provided.
2nd reversal in which the fluid is reversed downward and flows downward for a predetermined distance
A flow path is continuously provided, and the second inversion flow path is opened downward.
The downstream end defined as the outlet of the transfer pipe .

The invention according to claim 2 is characterized in that a solidifying material is added to earth and sand.
The viscous fluidity-improved soil mixed and kneaded is
From the bottom to the bottom through a transfer pipe and cast into the bottom
In the improved soil casting device,
Shall transfer the improved soil flowing down the pipe near the outlet of the pipe.
Inverted flow in which the air is inverted upward and rises to a predetermined height
Forming a channel, and the upstream portion of the channel is formed by the inversion channel.
Of reverse flow of water in the transfer pipe on the side
The bottom of the part is connected to the inside and outside,
An opening for discharging the improved soil outside the pipe, and opening and closing the opening
And an improved cover, and the improved soil is
It is designed to flow out from the outlet of the transfer pipe.
You. Further, the invention of claim 3 is the feature of the invention of claim 2
In addition to the above, the downstream end of the reversing flow path opening upward
An outlet of the transfer pipe is provided.

[0010] According to a feature of the invention of the claims, in pouring step, as an external water from the transfer pipe outlet modified soil is discharged is slightly penetrated near the inner wall of the transfer tube, the reversing flow close to the outlet Road (particularly, in the first aspect, the first inversion channel
In section (2) , the backflow (ie, descending) of the water in the transfer pipe is effectively suppressed by the difference in specific gravity between the improved soil and water. Therefore, since the water that has entered the transfer pipe does not flow upward on the upstream side of the reversing flow path, the improved soil flowing down the transfer pipe from the casting vessel and heading toward the water bottom reaches the pipe outlet. By this time, it hardly mixes with water in the pipe, so that the sediment in the improved soil mixes with water in the transfer pipe and can be effectively prevented from being separated from the solidified material and the like. As a result, from the outlet of the transfer pipe, the improved soil in a proper state where the sediment is not separated (that is, the soil and the solidified material are sufficiently mixed) can be poured into the water bottom. Earth and sand)
Can be quickly and firmly hardened, and the liberation of the solidified material from the earth and sand can be suppressed to a small amount as much as possible. Therefore, it is also effective in preventing the pollution of the water around the casting and disposal site due to the diffusion of the solidified material.

[0011] In particular, according to the feature of the invention of claim 1,
A downward second inversion channel section is connected to the downstream end of the first inversion channel section.
With this arrangement, the outlet can be opened downward and as close to the water bottom as possible, even though the first upward reversing flow path portion is specially provided near the outlet of the transfer pipe. It is possible to efficiently and accurately place the improved soil at the position without diffusing the improved soil, and the driving efficiency is good.

[0012] In particular, according to the feature of the invention of claim 2,
By opening the lid after the casting process, the transfer pipe
The improved soil that remains after the casting process is completed in the
Can be easily and accurately discharged.

[0013] In particular, according to the feature of the invention of claim 3,
The inversion flow path can be formed while minimizing the bent portion of the pipe near the outlet of the transfer pipe, thereby simplifying the structure of the transfer pipe and facilitating manufacture.

[0014]

Embodiments of the present invention will be described below with reference to an embodiment of the present invention shown in the accompanying drawings.

FIG. 1 is a schematic plan view showing an example of an improved soil transfer and casting system, FIG. 2 is an enlarged side view taken along the line 2-2 in FIG. 1, and FIG. 3 is a transfer according to an embodiment of the present invention. A fragmentary enlarged side view of the main part of the cast-in ship using pipes (enlarged view as seen in the direction of arrow 3 in FIG. 2), and FIG. , FIG. 5 is a longitudinal sectional view showing a leading end of a transfer pipe according to a first modification, and FIG. 6 is a longitudinal sectional view showing a leading end of a transfer pipe according to a second modification.

In FIGS. 1 and 2, the embankment B includes a landfill area A ₁ having a landfill Gr as a disposal site and a surrounding area A _2.
To partition between are erected building in the seabed, the surrounding area A _2, the processing vessels SW (JP-A for wind transporting it with added by kneading hardening material dredged material 7
-76454). The processing ship S
On one side of is W, the large amount of sediment that is dredged elsewhere, the peripheral area A soil luck Vessel SE which has been transported to ₂ is alongside, in yet another side of the processing vessel SW is as solidifying agent A solidified material plant ship SP that produces a cement slurry in which cement is kneaded with water is laid down.

The dredged soil in the earth transport ship SE is put into the hopper 34 of the processing ship SW by the earth-lifting machine (backhoe) 33 mounted on the processing ship SW, and solidified in parallel with this. The cement slurry generated by the material plant ship SP is continuously injected into the hopper 34.

In the processing boat SW, in the processing chamber below the hopper 34, the dredged soil is crushed and mixed with the cement slurry by stirring, and pressurized air obtained by rotation of the rotor in the processing boat SW and driving of the compressor is removed. Utilizing this, the mixture of the pulverized dredged soil and cement slurry, ie, the improved soil S, is forcibly transported to the floating discharge pipe 6 by a plurality of float pipes 8 connected to the processing chamber outlet. Haiokukan 6 have been extended to the landfill area A ₁ overcame embankment B, striking設船S that is anchored to the landfill area A ₁
It is transported to S.

From the casting vessel SS, the improved soil S is continuously transferred to the disposal site, that is, the bottom E of the landfill Gr, without separation of the dredged soil and cement slurry through the transfer pipe 12 as described in detail later. It is cast.

Next, referring mainly to FIGS.
The concrete structure of the improved soil casting device D installed in the factory will be described.

A cyclone 3 is fixedly supported on a hull 1 of the casting boat SS via a support frame 2. This cyclone 3 has a closed cylindrical cyclone body 3b,
An inflow port 3i is provided at the upper part of one side, and an outflow port 3 is provided at the lower part thereof.
o are opened, and an air separation chamber 3s is provided in the center of the upper wall. The upper end of the air separation chamber 3s is connected to the air duct 5, and a discharge port 5o for opening to the atmosphere is opened at the outer end of the air duct 5. The inlet 3i of the cyclone 3 has an outlet 6 of the discharge pipe 6 connected to the outlet of the processing vessel SW.
o is connected.

The improved soil S transported by wind in the discharge pipe 6 is as follows:
After entering the cyclone 3, the air mixed therein is separated, and then flows into the surge tank 10 below the cyclone body 3b.

A surge tank 10 is provided on the hull 1 adjacent to the cyclone 3 and integrally therewith. In the upper wall of the surge tank 10, the outlet 3 of the cyclone 3 is provided.
An inlet 10i directly communicating with o is opened, the bottom wall thereof is formed in a funnel shape, and an outlet 10o is opened at the lowermost portion. The improved soil S separated from the air in the cyclone 3 flows to the surge tank 10 by its own weight and is stored in the tank 10, and from the bottom thereof, the transfer pipe 12 further below the tank.
It flows inside by its own weight.

The transfer pipe 12 is attached to the hull 1 via a pivot shaft 15 at a support frame 17 integrally provided along the upstream end thereof, so that the hull 1 is at an arbitrary inclination angle (for example, on the water surface). (In the range of an inclination angle of 0 to 90 degrees). The upper portion in the transfer pipe 12 and the bottom outlet 10o of the surge tank 10 are connected via a telescopic connection tube portion 14 which can expand and contract along an arc centered on the pivot 15. Connection tube part 1
4, the improved soil S in the surge tank 10 flows down into the transfer pipe 12 by its own weight. The bottom outlet 1 of the surge tank 10
An opening / closing valve (not shown) that can arbitrarily adjust the amount of the improved soil S flowing from the inside of the tank 10 to the transfer pipe 12 side may be provided at 0o.

An actuator 16 such as a hydraulic cylinder is interposed between the support frame 17 of the transfer pipe 12 and the hull 1, and the transfer pipe 12 is pivoted by the actuator 16.
By forcibly swinging about five times, the inclination angle of the transfer pipe 12 with respect to the water bottom E, that is, the height (water depth) of the transfer pipe outlet 12o can be arbitrarily adjusted. The transfer pipe 12 is
It extends substantially straight downward to the water bottom E, and the improved soil S is directly poured into the water bottom E from the lower end outlet 12o.

At the leading end of the transfer pipe 12, there is formed a first reverse flow path section 21 for reversing the improved soil S flowing down in the pipe upward near the outlet 12o of the pipe so as to flow upward by a predetermined height. The improved soil S is discharged from the outlet 12o of the transfer pipe 12 via the inversion flow path 21. The first inversion channel portion 21 is provided at the outlet 12 of the transfer pipe 12.
The first to turn the flow of the improved soil S upward near o
A bent pipe portion 21A and a first extension pipe portion 21 extending upward from a downstream side of the bent pipe portion 21A with a predetermined height difference.
B.

On the downstream side of the first extension pipe portion 21B, the improved soil S, which has risen in the first inversion channel portion 21 (first extension pipe portion 21B), is inverted downward for a predetermined distance. A second inversion flow path section 22 for downward flow is continuously provided. The second reversing flow path portion 22 is a second bent pipe portion 22A that turns the improved soil S that has risen in the first extension pipe portion 21B downward.
And a second extension pipe portion 22B extending downward from the downstream side of the second bent pipe portion 21A with a predetermined height difference, and the downstream end of the second extension pipe portion 22B opened downward is transferred. The outlet 12o of the tube 12 is used. In addition, at least a part (in the illustrated example, an intermediate part) of the second extension pipe part 22B includes:
A tapered portion 22Bt tapering toward the downstream side is formed.

At the bottom of the first reversing flow passage 21, that is, at the bottom of the first bent tube portion 21A, an opening 2 for communicating the inside and outside thereof is provided.
3 and a lid 24 for closing the opening 23 are provided. The lid 24 is pivotally connected to the bottom of the first reversing flow path portion 21 so as to be able to swing open and close, and the lid 24 is further provided with an operation means I for remotely opening the lid 24 from the casting boat SS. Are connected, and a lock mechanism 32 for locking the lid in the closed position is provided between the lid 24 and the transfer pipe 12. In the illustrated example, the operating means I includes an operating wire (not shown) on the casting boat SS and an operating wire 30 routed along the outer surface of the transfer pipe 12 for interlocking connection between the lever and the lid 24. The operating rod of the lock mechanism 32 is connected to the wire 30. Then, by pulling the operation wire 30 in the opening direction, the lock mechanism 32 is automatically unlocked, and a moment in the opening direction is directly applied to the lid 24 so that the lid 24 is moved from above the casting vessel SS. Opening operation can be performed arbitrarily.

Next, the operation of the casting boat SS will be described. At the time of the casting operation, first, the transfer pipe 12 is swung by the actuator 16 to the use position in the water depending on the water depth, and the outlet 12o is made to approach the bottom of the water. Then, the processing vessel SW passes through the discharge pipe 6 and the casting vessel S
The improved soil S (a mixture obtained by mixing and mixing a cement slurry with dredged soil and sand, that is, a landfill) is transported by wind power to S. At this time, the improved soil S receives a high pulsating wind pressure and is intermittently transported into the cyclone 3 as a pulsating flow. After the air is separated in the cyclone 3, the surge tank is separated from the cyclone body 3b by its own weight. It falls into 10 and is temporarily stored there.

Then, the storage improved soil S in the surge tank 10
Gradually flows into the transfer pipe 12 under its own weight, and the transfer pipe 12
From the lower end exit 12o of the landfill, and is almost continuously landfilled on the water bottom E of the landfill site Gr, which is a landfill.

In the step of placing the improved soil, the outlet 12o of the transfer pipe 12 from which the improved soil S is discharged.
As shown in FIG. 7 (a), external water may slightly enter the vicinity of the inner wall of the transfer pipe 12 (in the illustrated example, the second extension pipe section 22B of the second reverse flow path section 22). Is caused by the difference in specific gravity between the soil and the improved soil S (especially soil and sand).
Ascend to near the top of 2. Therefore, there is a possibility that backflow of water occurs in the second inversion channel portion 22 by the same operation as that described in FIG.

However, in the first inversion channel portion 21 (first extension tube portion 21B) adjacent to the second inversion channel portion 22, the water flows backward in the transfer pipe 12 due to the specific gravity difference, that is, descends. Is effectively suppressed. Therefore, the second inversion channel portion 22
Since the water flowing backward in the inside can be effectively prevented from flowing backward in the first inversion flow path portion 21, the improved soil S flowing down in the transfer pipe 12 and heading toward the water bottom E flows backward in the pipe. It hardly mixes with water.

That is, the first inversion flow path portion 21 is specially provided near the outlet 12o of the transfer pipe 12, so that the transfer pipe 12
At least in the first inversion channel portion 21 and immediately upstream thereof, the weight (earth pressure) of the improved soil S in the pipe and the water pressure at the outlet 12o side are balanced, and the improved soil S is always filled there. To prevent backflow of water. In this case, the balance collapses when new improved soil S is supplied from the surge tank 10 to the upstream side of the transfer pipe 12, and accordingly the improved soil S in the pipe flows to the outlet 12o side as a whole. Therefore, an appropriate amount of the improved soil S is gradually discharged from the outlet 12o (that is, according to the supply amount on the upstream side).

As described above, in the second inversion channel section 22, since the flow direction is downward, the improved soil S may mix with the backflow water, but since the backflow section is short,
Therefore, the possibility that the soil in the improved soil S is separated is small.

Thus, the sediment in the improved soil S is transferred to the transfer pipe 12.
Since the sediment from the solidified material and the like can be effectively suppressed in the inside, the sediment is not separated from the outlet 12o of the transfer pipe 12 (that is, the sediment and the solidified material are sufficiently mixed). The improved soil S can be cast on the water bottom E. Accordingly, the improved soil S that has been cast can be quickly and firmly solidified on the water bottom E, and the liberation of the solidified material from the soil is suppressed to a minimum. It is also effective in preventing water pollution around the land.

Further, in this embodiment, in particular, at the downstream end of the first inversion channel section 21, the inversion channel section 21 (the first extension pipe section 2) is provided.
1B) The second inversion channel portion 22 in which the improved soil S rising in the inside is inverted downward and flows downward over a predetermined height difference.
And the downstream end of the second inversion channel portion 22 opening downward is used as the outlet 12 o of the transfer pipe 12. Therefore, the first inversion channel portion 21 is specially provided near the outlet 12 o of the transfer pipe 12. Nevertheless, the outlet 12o can be opened downward and as close to the water bottom E as possible. Therefore, the improved soil S can be efficiently and accurately driven from the outlet 12o to the target position of the water bottom E without diffusing the soil S, and the driving efficiency is good.

When the casting step is completed, the lid 24 at the bottom of the first inversion channel 21 is opened to open the bottom 23 of the first inversion channel 21 and the vicinity thereof through the opening 23 in the bottom. The improved soil S remaining in the pipe can be easily discharged outside the pipe. The operation of closing the lid 24 again is appropriately performed when the transfer pipe 12 is lifted above the water surface.

FIG. 5 shows a first modified example of the front end of the transfer pipe 12. In the previous embodiment, at the front end of the transfer pipe 12, the bent pipe sections 21A and 22B of the first and second reverse flow path sections 21 and 22 are smoothly bent in an arc shape and have a relatively small curvature. However, in this variant,
Bent tube portions 21A of first and second inversion flow passage portions 21 and 22;
22B is bent approximately 180 degrees and has a relatively large curvature.

Thus, in this modified example, the same operation and effect as in the previous embodiment can be obtained. Further, the first inversion channel portion 21 and the second
Since a part of the passage wall of the inversion flow path portion 22 can be shared, the structure can be simplified and the size can be reduced accordingly.

FIG. 6 shows a second modified example of the leading end of the transfer pipe 12. In the above-described embodiment and the above-described modified example, the second inversion flow path portion 22 is continuously provided downstream of the first inversion flow path portion 21 at the front end of the transfer pipe 12. The 2 inversion channel portion is omitted, and the downstream end of the first inversion channel portion 21 that opens upward is the outlet 12 o of the transfer pipe 12.

Thus, also in this modification, the effect of effectively preventing the backflow of water into the transfer pipe 12 is achieved, as in the previous embodiment. Moreover, in this modified example, the second reversing flow path portion is omitted, so that the bent portion of the pipe near the outlet 12o of the transfer pipe 12 is reduced as much as possible, so that the cleaning of the transfer pipe structure can be simplified and downsized. , The cost is reduced and the production is easy.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various embodiments are possible within the scope of the present invention. For example, in the above embodiment, the casting vessel SS may be a self-propelled vessel or a non-self-propelled vessel.
Further, in the above embodiment, the transfer pipe 12 is forcibly swung by the hydraulic cylinder 16, but other drive means (for example, a winch) may be employed as the drive means instead of the hydraulic cylinder.

In the above embodiment, the communication between the bottom outlet 10o of the surge tank 10 and the inside of the transfer pipe 12 is always performed regardless of the swing angle of the pipe 12 around the pivot 15.
The connection is made via a telescopically expandable and contractible connection tube portion 14, but instead of such a structure, the connection tube portion 14 is formed in a bellows shape, which is used to swing the transfer pipe 12. It may be configured to be able to expand and contract while deforming accordingly.

In the above embodiment, the improved soil S in the surge tank 10 is replenished and transferred to the upstream side of the transfer pipe 12 only by its own weight. However, in the present invention, an auger having screw blades or other forced soil is provided. Improved soil S by replenishing device
May be forcibly sent to the upstream side of the transfer pipe 12.

In the above embodiment, the opening operation of the lid 24 is performed by operating the operating lever on the casting boat SS, the lever and the lid 24.
Operating means I comprising an operating wire 30 for interlocking connection between them
However, in the present invention, the operation wire 30 may be driven by an actuator on the casting boat SS, and may be provided between the lid 24 and the transfer pipe 12 to open and close the lid 24. The lid 24 may be opened and closed by remotely operating a driving actuator.

[0046]

As described above, according to the invention of each claim ,
In a transfer pipe for transferring the fluidity-improved soil kneaded by adding the solidifying material to the earth and sand from the casting vessel to the water bottom, the improved soil flowing down the pipe is turned upward near the outlet of the pipe. Flow channel portion that flows upward by a predetermined height (claim 1)
In this case, a first inversion channel portion is formed , and the inversion channel portion is formed.
To prevent backflow of water in the transfer pipe on the upstream side.
When the improved soil is poured, even if external water slightly enters the vicinity of the inner wall of the transfer pipe from the outlet of the transfer pipe, the specific gravity difference between the improved soil and the water in the reversal flow channel part Backflow (that is, descending) of water in the transfer pipe is effectively suppressed, and backflow of water in the pipe further upstream of the inversion flow path portion is avoided. Therefore, the improved soil flowing down the transfer pipe is unlikely to be mixed with water until it reaches the pipe outlet. The improved soil can be poured on the bottom of the water, and the improved soil can be quickly and firmly hardened, and the solidified material released from the soil during the placement can be minimized. Therefore, it is also effective in preventing pollution of the water area around the casting site due to the diffusion of the solidified material. In addition, the above-mentioned inversion flow path can be obtained simply by forming a pipe bend near the outlet of the transfer pipe, so that the structure of the transfer pipe can be simplified as much as possible and cost can be reduced.

[0047] According particularly to the invention of claim 1, the downstream end of the first reversing flow path portion, by a predetermined distance downward flows downward by inverting the modified soil which has been raised the first reversing passage portion the second reversing flow path portion consecutively provided, since the downstream end which opens downward of the second reversing flow path portion and the outlet of the transfer pipe, upward
In spite of the fact that the first reversing flow passage section is specially provided near the outlet of the transfer pipe, the outlet of the transfer pipe can be opened downward and as close as possible to the bottom, so that the outlet can be improved from the outlet to the target position of the bottom. It is possible to efficiently and accurately place the soil without diffusing the soil, and the workability of the placement is good.

According to the second aspect of the present invention, the reverse flow
The inside and outside of the channel is connected to the bottom of the
An opening for discharging the improved soil outside the pipe, and opening and closing the opening
Since a possible lid is provided, open the lid after the casting process.
As a result, even after the completion of the casting process,
Can be easily and accurately extracted outside the pipe.
You.

According to the third aspect of the present invention, the downstream end of the inversion flow path opening upward is used as the outlet of the transfer pipe, so that the bent portion of the pipe near the outlet of the transfer pipe is minimized. The inversion channel portion can be formed, so that the structure of the transfer pipe is simplified, the cost is reduced, and the production is easy.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an example of a system for transporting and setting improved soil.

FIG. 2 is an enlarged side view taken along line 2-2 of FIG. 1;

FIG. 3 is an enlarged side view of an essential part of a casting boat using a transfer pipe according to an embodiment of the present invention (an enlarged view taken along line 3 in FIG. 2).

FIG. 4 is an enlarged view of a tip portion of the transfer pipe (an enlarged view taken along line 4 in FIG. 3).

FIG. 5 is a vertical cross-sectional view showing a leading end of a transfer pipe according to a first modification.

FIG. 6 is a vertical cross-sectional view showing a tip portion of a transfer pipe according to a second modification.

FIG. 7 is an explanatory view schematically showing a backflow rising mechanism of water at the tip of a conventional transfer pipe.

[Explanation of symbols]

D ····· Improved soil casting device SS ································································· Hull 12 ································ 21A: first bent pipe section 21B: first extended pipe section 22: second inverted flow path section 22A: second bent pipe section 22B: second Extension tube 23 ··· Opening 24 ··· Openable lid

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E02D 15/10 E02B 3/18 E02D 3/00 101

Claims (3)

(57) [Claims] 1. A viscous material obtained by adding and solidifying a solidifying material to earth and sand .
An improved soil casting device for transferring a certain fluidity-improved soil (S) from above a casting vessel (SS) to a water bottom (E) through a transfer pipe (12) and placing it on the water bottom (E). In the transfer pipe (12), a first reversal in which the improved soil (S) flowing down the pipe is reversed upward near the outlet (12o) of the pipe (12) to flow upward by a predetermined height. A flow path (21) is formed, and the first reverse flow path (21) is formed.
And the backflow of water in the transfer pipe (12) on the upstream side
As a result, the first inversion flow path (21) is located at the downstream end of the first inversion flow path (21).
The improved soil (S) that has risen in the flow path (21) is lowered.
Second reversing flow path that reverses direction and flows down a predetermined distance
Section (22) is connected to the second inversion channel section (22).
The downstream end that opens downward is the outlet of the transfer pipe (12).
(12o) A transfer pipe structure in an improved soil casting device, characterized in that: 2. A viscous mixture obtained by adding and solidifying a solidifying material to earth and sand.
A certain fluidity-improved soil (S) is placed on the submerged ship (SS)
(E) is transferred downward through the transfer pipe (12)
(E) In the improved soil casting device, which is to be poured into the transfer pipe (12), the transfer pipe (12) flows down the pipe.
Improve the improved soil (S) near the outlet (12o) of the pipe (12).
Reversing flow path part that reverses the direction and rises to a predetermined height and flows
(21) is formed, and the inversion channel portion (21) forms the
The backflow of water in the transfer pipe (12) upstream of
Blocking and, on the bottom of the reversing flow path portion (21), communicating the inside and outside
Then, the improved soil (S) in the inversion channel portion (21) is discharged outside the pipe.
Opening (23) for taking out and opening and closing the opening (23)
Closable lid and (24) is provided, wherein the reversing flow path portion (21) the modified soil via (S) has to flow out from the outlet (12o) of the transfer tube (12), improved Transfer pipe structure for soil casting equipment. 3. The improved soil casting according to claim 2 , wherein an upwardly-opened downstream end of the inversion channel portion (21) is an outlet (12o) of the transfer pipe (12). Transfer tube structure in the device.