JPH11200405A - In-pipe mixing method for injected hardener and soil for use during pneumatic conveyance of dredged soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-pipe mixing method for a hardener injected into a pneumatic pipe and dredged soil, enabling the hardener and the soil to be uniformly mixed together when the dredged soil is pneumatically conveyed. SOLUTION: In a force-feed pipe 4 for force-feeding dredged soil by means of air and for force-feeding a hardener injected therein and the soil by means of air, portions 4a, 4b are either made to branch off while having different pipe cross-sectional areas and then recombined, or are recombined after branching off while having different passage lengths, or are recombined after branching off while differing in both pipe cross-sectional area and passage length. Thereby the force-fed hardener and soil are uniformly mixed together inside the force- feed pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for uniformly mixing a solidified material injected into a sediment pumping pipe in a pipe in order to solidify the sediment to be pumped when the dredged sand is pneumatically fed. It is.

[0002]

2. Description of the Related Art In recent port dredging works, the water content is reduced as much as possible in order to minimize the disposal capacity of dredged earth and sand and to eliminate the treatment of a large amount of residual water contained in the earth and sand. Techniques for dredging earth and sand in high-concentration and low-concentration conditions have been developed. As a means for discharging such dredged soil to a landfill, the dredged soil has low water content due to low water content, so a large amount of air is mixed in and the expansion energy of the air is used to discharge the sediment. The so-called pneumatic feeding method of feeding has been widely adopted. With this air-pumping method, it is possible to discharge the soil in a state close to the water content of the ground, but since the properties of the soil itself in the ground do not change after the discharge, the water content is high. If the earth and sand is landfilled as it is (e.g., 150 or more), even if the landfill is completed and left as it is, the trafficability in the landfill will not improve over a long period of time, so people and horses will not be able to enter, The land cannot be used as it is.

[0003] For this reason, a method of improving the trafficability by performing ground improvement after completion of the landfill, or performing a landfill by solidifying the soil in a short period of time to obtain good trafficability before the landfill is implemented. ing.
In the latter case, it is necessary to mix cement and other solidifying materials into the earth and sand and mix them.However, conventionally, a mixing method using a mechanical mixer is used. A method of injecting the solidified material by fixed amount at a time A method of injecting the solidified material by fixed amount into the pumping air supplied to the pumping tube that performs the pneumatic pumping of the earth and sand There is a method of injecting the solidified material in fixed amounts at a time.However, in the method using a mechanical mixer, a large equipment cost is required because a high-efficiency mechanical mixer is required. According to the method of injecting the solidified material into the pipe in a fixed amount, the solid portion in the lug flow in the pumping pipe does not mix with the front part (downstream side) and the rear part (upstream side) of the solidified material. of Distribution in the sand is a problem, such as a nonuniform.

In addition, since the amount of the solidified material injected is a fixed amount, the solidified material is also injected into the gaseous phase portion of the plug flow in the pumping pipe, and the solidified material accumulated near the injection portion is removed from the next earth and sand portion. Will be discharged together when passing through, so the concentration of the solidified material at the front part (downstream side) of the sediment portion will be mixed at a higher concentration than at the rear part (upstream side), and mixing of the solidified material into the sediment will not be possible. There was the disadvantage of becoming homogeneous.

[0005]

SUMMARY OF THE INVENTION According to the present invention, when a solidified material is injected into a pumping pipe for pneumatically feeding dredged earth and sand, the earth and sand and the solidified material are not homogeneously mixed when the earth and sand are air-fed. It eliminates the drawbacks of the conventional pneumatic pumping method of being discharged in a state, and can uniformly mix the solidified material injected into the pumping pipe with the earth and sand. It is an object of the present invention to provide a method for mixing in a tube with the above.

[0006]

Means for Solving the Problems The present inventor has conducted intensive studies in order to solve the above-mentioned problems. As pipes, the pipes are merged again after branching with different pipe cross-sectional areas, or merged again after branching with different flow path lengths, or each pipe cross-sectional area is The use of a pumping pipe which branches at different flow paths with different flow path lengths and then merges again allows the solidified material to be pneumatically fed and the earth and sand to be homogeneously mixed in the pumping pipe. Thus, the present invention was completed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for mixing dredged earth and sand in a pipe during pneumatic feeding according to the present invention will now be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a state in which a method of mixing a poured solidified material and earth and sand in a pipe during pneumatic feeding of dredged earth and sand according to the present invention is carried out, and FIG. 2 is an air pressure of dredged earth and sand according to the present invention. FIG. 3 is an explanatory view showing one embodiment of a method of mixing the solidified material and earth and sand injected during pipe feeding in a pipe, FIG. 3 is an end view taken along line AA in FIG. 2, FIG. 4 is an end view taken along line BB in FIG. 5 is an end view taken along the line CC in FIG. 2, FIG. 6 is an end view showing another embodiment of the end face taken along the line AA in FIG. 2, and FIG. 7 is injected during pneumatic feeding of the dredged soil according to the present invention. FIG. 8 is an explanatory view showing another embodiment of a method for mixing a solidified material and earth and sand in a pipe, FIG. 8 is an explanatory view showing one embodiment of a preferred apparatus for injecting the solidified material into a pressure feeding pipe in air pressure feeding, and FIG. 9 is FIG. D- in
FIG. 10 is an end view of a line D, FIG. 10 is an explanatory view showing another embodiment of a preferable apparatus for injecting a solidifying material into a pressure feeding pipe in pneumatic feeding, and FIG. 11 is a sectional view taken along line EE in FIG.

First, the situation in which the pneumatic feeding according to the method of the present invention is performed will be described with reference to FIG. The soil 1 in a high-concentration state having a low water content and dredged by a dredging device (not shown) is conveyed to an air-pumping ship 3 by an earth-moving ship 2, and the water- and land-based pumping pipes 4 are transferred from the air-pumping ship 3. Then, the solidified material is injected into the landfill 5 by air and the solidified material is injected at one or more points on the water and land pumping pipe 4 and the method of the present invention is carried out.

That is, in order to carry out the method of the present invention, a solidifying material such as cement is injected into a pressure feeding pipe 4 for pneumatically feeding the dredged earth and sand 1, and a pressure feeding pipe 4 for air-feeding the earth and sand 1 and the solidifying material.
As shown in FIGS. 2 to 6, each of the pipes 4a and 4b has a different cross-sectional area and branches and then joins again. As shown in FIG. 7, each of the pipes 4a and 4b Of a configuration in which branching is performed with the flow path lengths being different, and then merging again. A configuration in which the cross-sectional areas of the respective pipes are different and branching is performed with the flow path lengths being different, and then re-merging. That is, the pumping pipe 4 in any one of the following cases is used, that is, the tubes 4a and 4b shown in FIG.

In the above case, specifically, as shown in FIGS. 3 and 5, a partition plate 4c provided at a predetermined position in the longitudinal direction of one pressure feed pipe 4 at a position deviated from the center of the pipe. And one pipe is divided into two pipes 4a having different cross-sectional areas.
By dividing the soil into the left and right or the upper and lower parts 4b, the earth and sand 1 into which the solidified material has been injected is divided into a plurality of pipelines 4a and 4b having different cross-sectional areas in the pressure feeding pipe 4, and then merges again. Since the pipe resistance differs depending on the cross sectional area of the pipes 4a and 4b, the respective pipes 4a and 4b have different resistances.
Due to the speed difference generated in the earth and sand portion in b, the mutual positional relationship of the earth and sand at the time of merging becomes different from that before the branching, and it becomes possible to mix the front and rear of the earth and sand portion in the plug flow which is not usually mixed. Instead, the solidified material and the earth and sand that are pneumatically fed by the collision of the earth and sand or the earth and the pipe wall surface at the time of merging can be uniformly mixed in the pressure feeding pipe.

As another example of the above case, FIG.
As shown in the figure, a predetermined portion in the longitudinal direction of the pressure feed pipe 4 is a double pipe and one pipe is divided into two pipes 4a and 4b having different cross-sectional areas.
Alternatively, for example, a Y-shaped pipe or the like may be used so that the flow path lengths may be the same, and branched into different pipes having different cross-sectional areas.

In the above case, as shown in FIG. 7, the pressure-feeding pipes 4 have the same cross-sectional area, but are merged again after branching into branched pipes 4a and 4b having different flow path lengths. The pumping tube 4 is used. As described above, the pressure-feeding pipes 4 have the same cross-sectional area but have different flow path lengths.
b, if they are merged again, the time required for the sediment diverted to the respective pipelines 4a and 4b to merge again will differ, so that the sediment in the original plug flow (downstream) The side) and the rear side (upstream side) are mixed at the time of merging, and homogeneous mixing is possible by the collision of the oozes at the time of merging and the collision with the associated wall surface. Further, in this case, the number of branches is not limited to two as shown in FIG. 7, but may be three or more.

The above-mentioned case is a combination of the above-mentioned case and the above-mentioned case, and after branching in a state where the cross-sectional area of each pipe is different and the length of each flow path is different, The pumping pipes 4 to be joined are used. That is, the one in which the pipe cross-sectional areas of the pipes 4a and 4b shown in FIG. 7 are different corresponds to this mode. In this embodiment, the effect of uniformly mixing the solidified material and the earth and sand to be pneumatically fed in the above-described case and the above-described case in the pumping pipe 4 is synergistic. If the cross-sectional area of the long pipe 4b is reduced, the transport deviation of the ooze at the time of merging can be further increased.

As shown in FIG. 1, the dredged soil 1 having a high water content is supplied from an air pump 3 to water and land pumping pipes 4.
When the air is pumped to the landfill 5 through
It is sufficient if one of the aspects is taken,
, Or any combination of two or more of the above-described embodiments, and further, a combination of two or more of the above-described embodiments. Needless to say, a plurality of any of the above modes may be adopted.

As described above, at the upstream side of the pumping pipe 4 in which at least one of the above aspects is adopted, it is necessary to inject the solidified material into the pumping pipe 4 for pneumatically feeding the dredged soil 1. The method of injecting the solidified material into the pumping pipe 4 is the above-described method that has been conventionally implemented, that is, a method of injecting the solidified material into the pumping pipe 4 for performing pneumatic feeding of earth and sand in a fixed amount. A method of injecting the solidified material into the pumping air supplied into the pumping tube 4 for feeding the soil in a fixed quantity at a fixed rate. Any method can be used, but the solidification material is injected only in the sediment part in the plug flow, and in the part without the sediment part, the injection is stopped. Front of part (downstream) It is preferable to prevent the solidified material concentration from becoming particularly high.

In order to inject the solidified material only in the earth and sand portion of the plug flow in this way, as shown in FIGS. 8 and 9, for example, as shown in FIGS.
One or a plurality of pressure receiving plates 6a are pivotally connected to support pins 6c via seal members 6b so as to be rotatable in the longitudinal direction of the feed pipe 4, and the pressure receiving plates 6a are, for example, torsion springs wound around the support pins 6c (shown in FIG. No), the earth and sand portion detector 6 normally urged to be vertically suspended in the pressure feed pipe 4 is provided, and the pressure feed near the downstream side of the position where the pressure receiving plate 6a is installed is provided. An injection nozzle 7a is provided in the pipe 4, and a press-fitting pump 7c is installed in the middle of a solidification material supply pipe 7d connecting the injection nozzle 7a and the solidification material storage section 7b. A solidifying material supply unit 7 provided with a mechanical injection valve 7e is provided between the nozzle 7a and the discharge nozzle 7a, and a lever 6d integrally formed with the pressure receiving plate 6a and protruding above the support pin 6c is provided. And this injection valve 7e by connecting rod 6
e, and the pressure receiving plate 6
The injection valve 7e is opened only while a is rotating in the longitudinal direction (downstream direction) of the pumping pipe 4, and a device having a structure in which the solidified material is injected into the pumping pipe 4 from the discharge nozzle 7a may be used. In such a device, by appropriately selecting the biasing force of the torsion spring, the opening of the injection valve 7e can be linked in accordance with the magnitude of the pressure of the earth and sand portion. As shown in FIG. 8, it is preferable to provide an accumulator 7f for assisting the press-fitting pump 7c in the solidified material supply unit 7 in order to rapidly inject the solidified material.

As another mode for injecting the solidifying material only in the earth and sand portion in the plug flow, for example, FIGS.
As shown in the figure, a sediment detection section 6 provided with one or a plurality of pressure-sensitive sensors 6a 'is provided at a predetermined position in the pressure feed pipe 4 immediately before the position where the solidified material is injected, and the pressure-sensitive sensors 6a' One or a plurality of injection nozzles 7a are provided in the pressure feeding pipe 4 near the downstream side of the position where the solidification material supply pipe 7d connecting the injection nozzle 7a and the solidification material storage unit 7b is provided. A press-fitting pump 7c is installed on the way, and a solidifying material supply unit 7 is provided with an injection valve 7e having an actuator between the press-fitting pump 7c of the solidifying material supply pipe 7d and the discharge nozzle 7a.
Is provided, the actuator of the injection valve 7e is connected to the pressure-sensitive sensor 6a 'by a signal cable 6g via an arithmetic unit 6f, and when the pressure-sensitive sensor 6a' detects the collision pressure of the earth and sand portion, A device having a structure in which the injection valve 7e is opened in accordance with the magnitude of the impact pressure of the earth and sand and the solidified material is injected into the pressure feed pipe 4 from the discharge nozzle 7a may be used.
In such an apparatus as well, as shown in FIG.
It is preferable to provide an accumulator 7f for assisting c.

8 and 9 or FIGS. 10 and 11 described above.
When the solidified material is injected into the pressure-feeding pipe 4 using the apparatus shown in (1), the solidified material is injected into the pressure-feeding pipe 4 only when the earth and sand portion just passes, and the earth and sand portion passes. When the collision pressure of the sediment is lost, the injection valve 7e is closed and the injection of the solidified material is stopped. Therefore, the injection of the solidified material into the portion having no sediment is eliminated, and the solidified material is injected only into the sediment. By doing so, the uniform mixing of the earth and sand with the solidified material is further improved. In such a device that injects the solidifying material only at the earth and sand portion in the plug flow, it is easy to mix homogeneous earth and sand with the solidifying material by installing a plurality of locations of the pumping pipe 4 as necessary. .

[0019]

As described above in detail, the method of mixing the poured solidified material and the earth and sand in the pipe at the time of pneumatically feeding the dredged earth and sand according to the present invention comprises the steps of: As a pumping pipe for pneumatically feeding the earth and sand and the solidified material, branching with different pipe cross-sectional areas and then rejoining, or branching with different flow path lengths And then re-merge, or use a pumping pipe that branches off with different pipe cross-sectional areas and different flow path lengths and then joins again. A simple and inexpensive method that allows the solidified material to be pneumatically fed and the earth and sand to be homogeneously mixed in the pumping pipe, resulting in good trafficability without any special ground improvement after landfill is completed. Landfill for short term Can be obtained, the industrial value is very large.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a method of mixing a poured solidified material and earth and sand in a pipe during pneumatic feeding of dredged earth and sand according to the present invention is performed.

FIG. 2 is an explanatory view showing one embodiment of a method of mixing a poured solidified material and soil in a pipe during pneumatic feeding of dredged earth and sand according to the present invention.

FIG. 3 is an end view taken along the line AA in FIG. 2;

FIG. 4 is an end view taken along line BB in FIG. 2;

FIG. 5 is an end view taken along the line CC in FIG. 2;

FIG. 6 is an end view showing another aspect of the end face taken along the line AA in FIG. 2;

FIG. 7 is an explanatory view showing another embodiment of the method of mixing the poured solidified material and the earth and sand in a pipe during pneumatic feeding of the dredged earth and sand according to the present invention.

FIG. 8 is an explanatory view showing one embodiment of a preferred apparatus for injecting a solidifying material into a pressure feeding tube in air pressure feeding.

9 is an end view taken along line DD in FIG. 8;

FIG. 10 is an explanatory view showing another embodiment of a preferred apparatus for injecting a solidifying material into a pressure feeding tube in air pressure feeding.

11 is a sectional view taken along line EE in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dredged earth and sand 2 Earth transport ship 3 Air pressure ship 4 Pumping pipe 4a Pipe line 4b Pipe line 4c Partition plate 5 Landfill 6 Earth and sand part detection part 6a Pressure receiving plate 6a 'Pressure sensor 6b Seal material 6c Support pin 6d Lever 6e Connecting rod 6f Arithmetic unit 6g Signal cable 7 Solidified material supply unit 7a Dispensing nozzle 7b Solidified material storage unit 7c Press-fit pump 7d Solidified material supply pipe 7e Injection valve 7f Accumulator

Claims (1)

[Claims] 1. A pumping pipe for injecting a solidified material into a pumping pipe for pneumatically feeding dredged earth and sand, and as a pumping pipe for pneumatically feeding the soil and the solidified material, branching in a state where the cross-sectional areas of the respective pipes are different, and then again. Merge or rejoin after branching with different channel lengths, or rejoin after branching with different pipe cross-sectional areas and different channel lengths In the pipe of the injected solidified material and the soil during the pneumatic feeding of the dredged soil, characterized in that the solidified material to be pneumatically fed and the earth and sand are homogeneously mixed in the pressure feeding tube by using the pumping pipe to be merged. Mixing method.