JPH01250527A - Casting method for earth or the like into water - Google Patents

Abstract

PURPOSE:To prevent slurry from being separated from, by casting slurry-formed casting material kneaded with added water, forcibly into water, through a casting pipe with a built-in screw conveyor. CONSTITUTION:A.F.material C agent, and B.N.agent are fed in the shape of a layer from respective hoppers 12, 13, 14 onto a belt conveyor 15. After that, casting materials are mixed on the conveyor 15 by a mixing buffle plate 16 and are fed to a casting pipe 1. After that, in the continuous mixer section 2 of the casting pipe 1, the materials, together with water injected from the water injecting slot of an agitating wing 4, are kneaded by the agitating wing 4, and are fed to a tremie pipe 3 by a spiral wing 5. Besides, the slurry-formed materials are fed by the spiral wing 5, and are jetted to the sea bottom from the jet port 3a of the tremie pipe 3, and are cast.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an underwater injection method for injecting earth and sand for reclamation into water when constructing soil covering, embankment, or artificial islands on the underwater bottom. .

[Prior art]

Conventionally, this type of input method involves placing or dumping earth and sand for landfill into water, and if the material is dumped from the water surface, it will be separated by particle size underwater.

If the soil is classified and cannot form a uniform ground, or if there is sludge on the seabed, the sludge will be stirred up by the input earth and sand, making it impossible to contain it.

From this point of view, in the conventional method of charging earth and sand, it has been generally used to add water to the input material to form a slurry, and to charge the slurry through a pouring pipe.

[Problems to be solved by this invention]

However, separation occurs due to high-speed free fall of the slurry inside the vertically erected pouring pipe. Alternatively, in order to prevent deterioration of the slurry due to water intrusion into the pouring pipe when pouring the slurry into water, the pouring pipe is always filled with slurry.
In reality, several problems remain, such as the need to maintain the filled state.

This invention was devised in view of the above-mentioned circumstances, and its purpose is to prevent the slurry state of the input material from deteriorating due to separation at the time of charging, and to prevent water from entering into the pouring pipe when charging the slurry. The purpose of the present invention is to provide a method for introducing soil, etc. into water that does not occur.

[Means to solve the problem]

According to the underwater charging method of the present invention, the slurry-formed material is forcibly poured into the water by adding water and kneading it through a casting pipe that has a built-in screw conveyor equipped with stirring blades and spiral blades. I decided to.

The screw conveyor installed inside the pouring pipe prevents the slurry-like input material from falling freely, and the screw conveyor forcibly sends out the slurry-like input material, so that the inside of the pouring pipe is always filled with slurry-like input material. It is designed to be filled.

〔Example〕

Hereinafter, the underwater immersion method of the present invention will be explained with reference to illustrated embodiments.

As shown in FIG. 1, the casting pipe 1 used in the present invention consists of a continuous mixer part 2 formed at the top and a tremie pipe 3 formed at the bottom.

The continuous mixer part 2 is formed to have a large diameter, and has a stirring blade 4 having a plurality of injection holes (not shown).
and spiral blades 5 are alternately provided on the rotating shaft 6.

Further, the tremie tube 3 is formed to have a small diameter, and a plurality of spiral blades 5 are provided on the rotating shaft 6.

A screw conveyor 7 is formed by each stirring blade 4 and each spiral blade 5 of the continuous mixer portion 2 and the tremie tube 3.

In FIG. 1, reference numeral 8 is a drive motor for rotating the rotary shaft 6, and 9 is a swivel provided for injecting liquid into the rotary shaft 6.

Next, a description will be given of a method of placing the pipe into water according to the present invention using the casting pipe 1 having the above-described configuration.

First, the pouring pipe 1 is installed in the tower II which is erected on the barge IO so as to be movable up and down. (See Figure 2) In Figure 2, 12 is F, A, hopper, 13 is C hopper, 14 is B, N, hopper, 15 is belt conveyor, 1
Reference numeral 6 is a baffle plate for bi-coupling, and reference numeral 17 is a pump.

and from each Homper 12.13.14, F.

Material A, material 18a, material C, and material B, material N 18b are delivered onto the belt conveyor 15 in a layered manner. (See Figure 3) Next, this F, A, material 18a, C agent and B.

The input material 18 consisting of nitrogen and the agent 18b is sent to the casting pipe 1 while being mixed by a remixing baffle Fi 16 on the belt conveyor 15.

Next, the input material 18 sent to this pouring pipe 1 is
In the continuous mixer part 2, water is injected from the water injection hole 4a of the stirring blade 4, and is kneaded by the stirring blade 4 to form a slurry.

Then, it is sent to the tremie tube 3 by the spiral blade 5.

Next, the slurry cast material 18 sent to the tremie tube 3 is sent by a plurality of spiral blades 5, and is sent to the tremie tube 3.
It is discharged from the discharge port 3a onto the seabed and placed.

In this way, the charging material 18 is turned into a slurry by the pouring pipe 1, and is thrown into the water.

In this embodiment, a part of the continuous mixer 2 is built in the upper part of the pouring pipe, and unlike the conventional construction method, a separate kneading machine is not required, so that space is no longer required. The continuous mixer part 2 has a structure in which a stirring blade 4 and a spiral blade 5 are combined, and the dry materials are stirred and mixed by inputting the dry materials. Furthermore, water is added through the water injection hole provided in the stirring blade, and the slurry can be continuously kneaded and created.

In addition, when slurrying the input materials, in order to give the input soil strength, coagulants (cement, etc.) are added, and organic materials are added to prevent separation during pouring and to maintain the consistency of the slurry.

Inorganic thickeners may also be added.

[Effects of the Invention] The underwater charging method of earth and sand according to the present invention forcibly adds water to slurry-formed materials through a casting pipe that has a built-in screw conveyor equipped with stirring blades and spiral blades. It is characterized by being discharged into the water.

According to this configuration, the input material in the form of slurry is moved within the pouring pipe by a screw conveyor. Therefore, the slurry-like cast material does not freely fall within the pouring pipe, so that the slurry state of the cast material does not deteriorate due to the separation phenomenon caused by falling.

This means that, for example, when reclaiming the seabed, the input materials are not scattered and the sludge on the seabed is not stirred up, but the sludge and the like can be contained and the seabed can be reliably reclaimed.

Further, since the input material is forcibly moved inside the pouring pipe by the screw conveyor, the inside of the pouring tube is always filled with slurry-like input material. Therefore, when the input material is discharged from the casting pipe, it is possible to prevent water and the like from entering into the casting pipe.

This can reduce seawater contamination of the slurry cast material in the pouring pipe.

Furthermore, since the screw conveyor inside the pouring pipe is equipped with stirring blades and spiral blades, the input material can be slurried in the pouring pipe without the need for a separate kneading machine, and this slurry cast material can be slurried. The discharge and pouring speed can be kept constant.

Therefore, it is possible to discharge and cast a slurry-like casting material with a homogeneous density using a simple and inexpensive device that does not require a separate kneader. This means that when the slurry cast material is discharged onto the seabed ground, a strong ground can be formed at low cost.

Furthermore, since all the main steps from stirring and kneading to pouring are carried out within the pouring pipe, it is easy to manage and automate.

In addition, since the pouring material is forcibly discharged by a screw conveyor, the pouring pipe outlet is always deeper than a general pouring pipe into the slurry cast material cast in water. It becomes the form in which . Therefore, the portions that come into contact with water are almost the same, reducing water contamination and PH contamination.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view showing the casting pipe used in the method of the present invention, Fig. 2 is a schematic sectional view showing the casting pipe in a state where it is attached to a barge, and Fig. 3 is A-A in Fig. 2. It is a line sectional view. ■... Concrete pipe, 2... Part of continuous mixer, 3... Tremy tube, 3a... Discharge port, 4... Stirring blade, 4a
... Water injection hole, 5 ... Spiral blade, 6 ... Rotating shaft, 7 ... Screw conveyor, 8 ... Drive motor, 9 ... Swivel, lO ... Barge, 11 ...・Tower body, 12...F, A, hopper, 13...C hopper, 14...B, N, hopper, 15...belt conveyor, 16...baffle plate for mixing, 17. ...Pump, 18...Input material. 1 diagram

Claims (1)

[Claims] A method for removing earth and sand, which is characterized by forcibly pouring slurry-like input material into the water by adding water and kneading it through a pouring pipe with a built-in screw conveyor equipped with stirring blades and spiral blades. How to put it into water.