JP7012600B2 - Pumping method - Google Patents

Description

The present invention relates to a pumping method in which a fluid material used in construction is pumped inside a transport pipe.

Various types of pumping methods for pumping fluid materials such as earth and sand or concrete used in construction work have been conventionally known. For example, Patent Document 1 describes a dredged soil transportation system for transporting dredged soil inside a delivery pipe. Shearing resistance is greatly generated on the inner surface of the delivery pipe due to the influence of viscosity, and the flow form similar to that of rigid body flow is exhibited toward the central layer away from the inner surface of the delivery pipe. When delivering a mixture such as dredged soil, pressure is applied due to the influence of inertia and viscosity, and the component with a large mass shows the form of depositing at the bottom of the delivery pipe.

The dredging soil transportation system of Patent Document 1 is a dredging soil transportation system using a magnetic field and a tornado turbulence technique. The dredged soil transportation system includes a pump module, a piping module, a control module, a database and a status measurement unit. In this dredging soil transportation system, first, compressed air is injected into the inside of the delivery pipe, and a plug flow is formed inside the delivery pipe, which is divided into a liquid part and a vapor part and flows. After that, an electromagnetic field is applied to the delivery pipe to form a tornado in the plug flow, thereby reducing the flow friction resistance and controlling the flow of the dredged soil.

The dredged soil transport system is equipped with a coil that applies an electromagnetic field to the delivery pipe. The coil is made of a conductive material such as copper and is wound around the delivery tube in consideration of Faraday's right-hand rule. Further, the control module controls the current applied to the coil according to the actual flow information and the physical property information of the liquid portion inside. The control module includes a central calculation unit, a function generation unit, a pulse generation unit, and a bridge circuit unit, and applies a current having a waveform that matches the flow waveform of the liquid unit transported in the delivery pipe to the coil. In the dredged soil transportation system, the efficiency of dredged soil delivery inside the delivery pipe is improved by controlling the current applied to the coil.

Japanese Patent No. 5945890

In the above-mentioned dredging soil transportation system, a coil is installed in the transport pipe, and an electric current is applied to the coil wound around the transport pipe to improve the efficiency of delivery. However, as described above, the dredged soil transportation system includes a pump module, a piping module, a control module, a database and a state measurement unit, and the control module includes a central calculation unit, a function generation unit, a pulse generation unit and a bridge circuit unit. It has a complicated structure and is large-scale. Therefore, it may not be possible to properly install the coil on the transport pipe.

The appropriate conditions for the current applied to the coil vary depending on the type of pump that pumps the fluid material, the diameter of the transport pipe, the layout of the transport pipe, the material of the fluid material, and the like. That is, since the appropriate conditions for the current applied to the coil differ from site to site, it may not be possible to efficiently pump the fluid material simply by winding the coil around the transport tube and applying the current to the coil.

It is an object of the present invention to provide a pumping method capable of appropriately performing the work of installing a coil in a transport pipe and efficiently pumping a fluid material.

The pumping method according to the present invention is a pumping method in which a fluid material used in construction is pumped inside a transport pipe, in which a coil for generating an electromagnetic field is wound around the transport pipe and a lubricating layer is provided on the inner surface of the transport pipe. The step of forming, the step of confirming the pumping load in the transport pipe on which the lubricating layer is formed, the step of passing a current through the coil so as to be the pumping load confirmed in the step of checking the pumping load, and the step of passing a current through the coil. In the process, a process of pumping the fluid material with a current flowing through the coil is provided, and in the process of forming the lubricating layer, a simulated lubricating layer is formed before the current is passed through the coil, and the pumping load is confirmed. In the process of checking the pumping load with a simulated lubricating layer formed, in the process of passing a current through the coil, the magnitude and frequency of the current to the coil are adjusted, and the fluidity inside the conveyor pipe is adjusted. It is determined whether or not the pumping load of the material is the pumping load confirmed in advance, and if it is determined that the pumping load is not confirmed in advance, the magnitude and frequency of the current to the coil are adjusted. If it is determined that the pumping load has been confirmed in advance, the magnitude and frequency of the current to the coil are fixed, and then the step of pumping the fluid material is executed, and the step of pumping the fluid material is executed. Then, the admixture is pumped together with the fluid material, and the admixture is a bubble material for shielding work used for stabilizing the face .

In the pressure feeding method according to the present invention, a coil that generates an electromagnetic field is wound around a transport tube to pass an electric current through the coil. Therefore, since the configuration for pumping the fluid material can be simplified, the work of installing the coil in the transport pipe can be appropriately performed. Further, after winding the coil that generates the electromagnetic field around the transport pipe and before the step of passing a current through the coil, a lubricating layer is formed on the inner surface of the transport pipe. Then, the pumping load in the transport pipe on which the lubricating layer is formed is confirmed. In the confirmation of the pumping load, the effect when the fluid material is pumped can be confirmed, so that the effect at the time of pumping can be extracted in advance. As a result, by extracting the effect at the time of pumping in advance, it is possible to confirm the magnitude of the current to the coil and the frequency of the current when the effect becomes remarkable for each construction site. Therefore, by adjusting the current and frequency to the coil so as to have a pumping load confirmed in advance, the fluid material can be pumped so as to exert a remarkable effect. Therefore, the fluid material can be efficiently pumped by confirming in advance the effect of pumping that differs from site to site.

Further, in the step of pumping the fluid material, the fluid material may be pumped from underground to above ground. Generally, in the work of pumping a fluid material from underground to the ground, if the fluid material cannot be efficiently pumped inside the transport pipe, vibration and noise of the transport pipe are likely to occur. On the other hand, in this pumping method, the pumping load is confirmed in advance to confirm the effect when the fluid material is pumped. Therefore, since the current and frequency to the coil can be adjusted so as to exert the confirmed effect, the fluid material can be efficiently pumped from the underground to the ground. As a result, vibration and noise of the transport pipe can be suppressed.

Further, in the step of pumping the fluid material, the earth and sand generated in the shield work may be pumped inside the transport pipe. In the shield work, the excavated earth and sand may be pumped by the transport pipe, but if the fluidity of the excavated earth and sand inside the transport pipe is small, the friction generated between the inner surface of the transport pipe and the earth and sand becomes large. .. As a result, it may not be possible to efficiently pump the excavated soil. However, in this pumping method, the pumping load can be confirmed in advance, and the current and frequency to the coil can be adjusted so that the effect at the time of pumping becomes remarkable. Therefore, by confirming the pumping load in advance, it is possible to efficiently pump the earth and sand generated by the shield work.

Further , by injecting an admixture whose fluidity is increased by electromagnetic action into the inside of the transport pipe, it is possible to more efficiently pump the fluid material inside the transport pipe. Therefore, by pumping the admixture together with the fluid material, the friction generated between the inner surface of the transport pipe and the fluid material can be suppressed, which contributes to further improvement of the pumpability.

According to the present invention, the work of installing the coil in the transport pipe can be appropriately performed, and the fluid material can be efficiently pumped.

It is a figure which shows the example of the construction site to which the pumping method which concerns on embodiment is applied. It is an enlarged view of a part of the transport path of the fluid material in the construction site of FIG. It is a perspective view which shows the example of a transport pipe. It is a figure which shows typically the transfer tube, the coil, and the power supply device of FIG. FIG. 3 is a cross-sectional view schematically showing a lubricating layer and a fluid material formed inside the transport pipe of FIG. It is a flowchart which shows the example of the pumping method which concerns on embodiment. It is a figure which shows the site of the experiment to which the pumping method which concerns on an Example is applied. It is a graph which shows the time-series change of the in-pipe pressure and the time-series change of the electric load of a pump obtained from the pressure feeding method which concerns on an Example. It is a graph which shows the time-series change of the in-pipe pressure and the time-series change of the electric load of a pump different from FIG. 8 obtained from the pumping method which concerns on an Example.

Hereinafter, embodiments of a method for pumping a fluid material according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicate description will be omitted as appropriate. In addition, the drawings may be partially simplified or exaggerated for the sake of easy understanding, and the dimensional ratios and the like are not limited to those described in the drawings.

First, site A, which is an example of a construction site to which the method of pumping fluid materials according to the present embodiment is applied, will be described. As shown in FIG. 1, in the pumping method according to the present embodiment, the fluid material used at the site A is pumped through the inside of the transport pipe 1. The transport pipe 1 is, for example, a steel pipe. The cross-sectional shape of the transport pipe 1 is, for example, an annular shape, but may be another shape such as a quadrangle. In the present embodiment, an example in which the fluid material is earth and sand 10 (see FIG. 5) and the transfer pipe 1 is the transfer path of earth and sand 10 will be described.

At the site A, the ground is excavated in order to construct a building structure, and the earth and sand 10 generated by the excavation is pumped from the underground G to the ground T through the transport pipe 1. For example, at site A, shield work is performed to move the excavator 2 forward. As an example, the transport pipe 1 has an earth and sand introduction portion 1A extending diagonally upward from an intake port 1a for taking in earth and sand from an excavator 2, a horizontally extending portion 1B extending substantially horizontally from the upper part of the earth and sand introduction portion 1A, and a horizontally extending portion. It includes a vertical extending portion 1C extending from an end of the portion 1B opposite to the sediment introducing portion 1A to the ground T, and a sediment discharging portion 1D at the upper end of the vertical extending portion 1C.

For example, the vertically extending portion 1C extends from the underground G to the above-ground T, and the earth and sand discharging portion 1D is bent substantially horizontally from the upper end of the vertically extending portion 1C. As an example, an earth and sand hopper 3 for temporarily accommodating the earth and sand 10 is provided below the earth and sand discharge portion 1D, and a dump truck 4 is provided below the earth and sand hopper 3. The earth and sand discharge unit 1D discharges the earth and sand 10 to the earth and sand hopper 3, and the earth and sand hopper 3 loads the earth and sand 10 on the dump truck 4. Then, the dump truck 4 carries out the loaded earth and sand 10.

For example, a space C is formed below the horizontally extending portion 1B, and equipment used for shielding work is arranged in the space C. As an example, in space C, a pump 5a, a driver trolley 5b, a power unit trolley 5c, a control panel trolley 5d, a mud soil material trolley 5e, a transformer trolley 5f, a cable trolley 5m, a secondary soil discharge pump 5g, an expansion pipe 5h and materials. The dolly 5j is arranged. However, each of the above-mentioned devices including the pump 5a is arranged at an arbitrary position of the transport pipe 1. Further, the arrangement of each of the above-mentioned devices is merely an example, and devices other than the above-mentioned devices may be arranged, or some devices may be omitted. An earth and sand discharge pump 5k is provided between the earth and sand introduction portion 1A and the horizontal extension portion 1B, and the earth and sand 10 is pumped from the earth and sand introduction portion 1A to the horizontal extension portion 1B by the earth and sand discharge pump 5k.

FIG. 2 is an enlarged view of the earth and sand introduction portion 1A of the transport pipe 1. The earth and sand introduction portion 1A includes a screw conveyor 6 for taking in the earth and sand 10, and the screw conveyor 6 extends diagonally upward from the intake port 1a toward the horizontal extending portion 1B. For example, the excavator 2 uses a cutter 2a for excavating the earth and sand 10, a kneading blade 2b for kneading the earth and sand 10, a cutter motor 2c for driving the cutter 2a, a shield jack 2d for pushing out the cutter 2a, and a mud-making material. It is provided with a mud soil material injection hole 2e for injection.

As an example, the excavator 2 performs a mud pressure shield method. The earth and sand 10 cut by the cutter 2a is converted into mud, the face is stabilized, and the excavation management is performed by the mud pressure. For example, the excavator 2 injects the mud soil material into the earth and sand 10 excavated by the cutter 2a, mixes the mud soil material and the earth and sand 10 with the kneading blade 2b, and then introduces the earth and sand 10 into the earth and sand introduction portion 1A (screw conveyor 6). Introduce to the intake port 1a.

As shown in FIGS. 1 and 2, for example, the earth and sand introduction portion 1A and the horizontally extending portion 1B of the transport pipe 1 are provided with coils groups 11 and 12 for promoting the pumping of the earth and sand 10. As an example, the coil group 11 is installed on the upstream side (intake port 1a side) of the sediment introduction portion 1A in the sediment transfer path. Further, the coil group 12 is installed on the upstream side of the horizontally extending portion 1B (the end portion on the sediment introduction portion 1A side) in the transport path of the sediment 10. However, the coils groups 11 and 12 may be installed in a portion of the transport pipe 1 different from the above.

The transport pipe 1 is provided with an admixture supply unit 18 for supplying an admixture to be pumped together with the earth and sand 10. As an example, the admixture supply unit 18 is provided on the upstream side of the coil group 11 in the transport path of the earth and sand 10, and a very small amount of admixture is supplied from the admixture supply unit 18 to the inside of the transport pipe 1. The admixture is, for example, a foam material, a water reducing agent or a lubricant. The air bubble material is, for example, air bubbles for shield work used for stabilizing the face, and in this case, the air bubbles for shield work can be effectively used for improving the pumping property of the earth and sand 10. The water reducing agent used as the above-mentioned admixture is, for example, an admixture that causes an electrostatic repulsive action to increase fluidity. Further, when the admixture contains a material that is easily affected by electricity, it becomes possible to more smoothly pump the earth and sand inside the transport pipe 1.

FIG. 3 is an enlarged perspective view of an example of the arranged coil group 11 (coil group 12). As shown in FIG. 3, the coil group 11 (coil group 12) includes a plurality of coils 11a (coils 12a) composed of cables. Since the coil group 12 has the same configuration as the coil group 11, the coil group 11 (coil 11a) will be described below, and the description of the coil group 12 (coil 12a) will be omitted as appropriate. Further, in the present specification, the "coil" refers to a cable wound in a spiral or spiral shape, and the "coil group" refers to an aggregate of a plurality of coils.

Each coil 11a is composed of one cable. That is, one cable is spirally wound around the outer surface 1b of the transport pipe 1 to form the coil 11a. One cable forming each coil 11a may be in close contact with the outer surface 1b or may be separated from the outer surface 1b. Further, the cable is spirally wound around the outer surface 1b of the transport pipe 1 at a position away from one coil 11a, so that a coil 11a different from the coil 11a is configured. By winding one cable around the outer surface 1b of the transport pipe 1 in this way, a plurality of coils 11a are configured. A band 13 is interposed between each coil 11a and the outer surface 1b of the transport pipe 1, and each coil 11a is fixed to the outer surface 1b by the band 13.

FIG. 4 schematically shows a power supply device 15 for passing a current through each coil 11a of the coil group 11 (each coil 12a of the coil group 12) and an electromagnetic field M (magnetic field) generated in each coil 11a by the supply of the current. There is. The electromagnetic field M is an electromagnetic field (EMF: Electromagnetic Field) generated by a current to the coil 11a. That is, EMF is generated at the position of the transport pipe 1 in which the coils 11a and 12a are present. The power supply device 15 supplies a current to each coil 11a. In the power supply device 15, the magnitude of the current supplied to each coil 11a and the frequency of the current supplied to each coil 11a can be adjusted.

The power supply device 15 includes a monitor 15a capable of confirming the magnitude of the current supplied to each coil 11a and the frequency of the current supplied to each coil 11a. When a current is passed from the power supply device 15 to each coil 11a, an electromagnetic field M is generated from each coil 11a wound around the transfer pipe 1, and the direction of the electromagnetic field M follows the so-called right-hand rule. In the present embodiment, since each coil 11a is spirally wound around the outer surface 1b of the transport pipe 1, an electromagnetic field M is generated along the longitudinal direction (axis direction) of the transport pipe 1.

FIG. 5 is a diagram showing a cross section of the transport pipe 1 around which the coil 11a is wound. As shown in FIGS. 4 and 5, when an electromagnetic field M is generated in the transport pipe 1, the earth and sand 10 pumped inside the transport pipe 1 receives the electromagnetic field M, and the moisture held by the earth and sand 10 is the earth and sand 10. Exudes out of. In this way, the electromagnetic field M exudes water from the earth and sand 10, and the water exuded from the earth and sand 10 forms a lubricating layer L that adheres to the inner surface 1c of the transport pipe 1. As an example, the diameter of the transport pipe 1 is 125 mm, and the thickness of the lubricating layer L is 1 mm or more and 2 mm or less.

By forming the lubricating layer L on the inner surface 1c of the transport pipe 1 in this way, it becomes difficult for the earth and sand 10 to adhere to the inner surface 1c. Will be. Further, the transport pipe 1 includes a pressure gauge 16 for measuring the pressure inside the transport pipe 1 and a flow meter 17 for measuring the flow rate inside the transport pipe 1, and the pressure gauge 16 and the flow meter 17 transport. It is provided at an arbitrary position of the pipe 1.

In the following, a pumping method for pumping earth and sand inside a transport pipe will be described. By the way, in the conventional pumping method having no coils 11a and 12a, when the fluidity of the sediment is small, the friction between the inner surface of the transport pipe and the sediment becomes large, so that the transport pipe vibrates during the pumping of the sediment. There was a problem that noise was generated. Further, there is also a problem that the friction between the inner surface of the transport pipe and the earth and sand becomes large, so that the earth and sand accumulate inside the transport pipe and the earth and sand cannot be pumped.

Further, in the conventional pumping method, a water injection ring is arranged on the inner surface of the transport pipe, and water is injected from the water injection ring to the inner surface of the transport pipe to pump the earth and sand. In this conventional pumping method, since a layer of water due to water injection can be formed between the inner surface of the transport pipe and the earth and sand, it is possible to reduce the friction between the inner surface of the transport pipe and the earth and sand. .. However, in this pumping method, water is injected into the soil to be pumped, so that there is a problem that the water ratio of the soil changes greatly depending on the amount of water injected. In this case, since the soil becomes muddy due to the increase in the water ratio of the soil after the pumping of the soil, the soil cannot be carried out as it is. Therefore, since it is necessary to apply a modifier such as cement or lime to the muddy soil to reform the soil before carrying it out, it is not possible to easily dispose of the soil after it comes out of the transport pipe. There was a problem.

Further, when the coils 11a and 12a are installed in the transport pipe 1 to pump the earth and sand 10, the lubricating layer L is formed from the water content of the earth and sand 10 as described above, so that the earth and sand 10 is prevented from becoming mud. At the same time, it is possible to easily process the earth and sand 10 after it comes out of the transport pipe 1. However, the effect of the pumping property of the earth and sand 10 by the action of the electromagnetic field M is that the specifications of the pump 5a for pumping the earth and sand 10, the diameter of the transport pipe, the length of the transport pipe, the layout of the transport pipe, the material of the earth and sand 10, etc. It depends on various conditions of A. Therefore, simply installing the coil in the transport pipe to generate a magnetic field may not fully exhibit the effect of pumping soil. That is, since the appropriate conditions for the current applied to the coil differ depending on the site A, it may not be possible to efficiently pump the earth and sand 10 simply by winding the coil around the transport pipe and applying the current to the coil.

In the pumping method according to the present embodiment, the above-mentioned problem is solved by verifying the pumping load (pumping load) of the earth and sand 10 in advance. Hereinafter, the pumping method according to the present embodiment will be described with reference to FIG. FIG. 6 is a flowchart showing an example of each step of the pumping method according to the present embodiment.

First, each device is installed on the transfer pipe 1 (step S1). At this time, the coils 11a and 12a, the power supply device 15, the pressure gauge 16 and the flow meter 17 are installed in the transport pipe 1 (the step of winding the coil around the transport pipe). Next, the lubricating layer L is formed on the inner surface 1c of the transport pipe 1 (step S2 of forming the lubricating layer). Specifically, a simulated lubricating layer L is forcibly formed before a current is passed through the coils 11a and 12a. The formation of the lubricating layer L may be performed, for example, by installing a water injection ring on the inner surface 1c and injecting water from the water injection ring.

After forming the simulated lubricating layer L, the pumping load of the earth and sand 10 is confirmed (step S3, step of confirming the pumping load). Specifically, the pressure gauge 16 measures the pressure inside the transport pipe 1 and the flow meter 17 measures the pressure feed flow rate inside the transport pipe 1 while flowing the earth and sand 10 inside the transport pipe 1 on a trial basis. , The electric load of the pump 5a is measured, and the effective values of the in-pipe pressure, the pressure feed flow rate and the electric load are measured.

That is, in a state where the simulated lubricating layer L is formed, good values of the in-pipe pressure, the pressure feed flow rate, and the electric load in the transport pipe 1 of the site A are searched for. In this way, the pumping load of the sediment 10 can be confirmed by confirming the effect parameters that are good values of the in-pipe pressure, the pumping flow rate, and the electrical load from the pumping form of the sediment 10 of the transport pipe 1 at the site A. conduct. It is not necessary to measure all of the pipe pressure, the pressure feed flow rate and the electric load, and only one of the pipe pressure, the pressure feed flow rate and the electric load may be measured.

After confirming the pumping load as described above, for example, the water injection from the water injection ring described above is stopped. Then, the electromagnetic field M (magnetic field) is adjusted while adjusting the current from the power supply device 15 to the coils 11a and 12a while flowing the earth and sand 10 through the transport pipe 1 (step S4 in which the current is passed through the coil). Specifically, the magnitude and frequency of the current to the coils 11a and 12a are adjusted. Then, as a result of the adjustment of the electromagnetic field M, it is determined whether or not the pumping load of the earth and sand 10 inside the transport pipe 1 is the pumping load confirmed in advance (step S5).

At this time, for example, the pressure in the pipe is measured by the pressure gauge 16, the pressure feed flow rate is measured by the flow meter 17, and the electric load of the pump 5a is measured, and each of these measurement results is the same as the measurement result confirmed in step S3. It is determined whether or not (or whether it is better than each measurement result confirmed in step S3). That is, it is determined whether or not the effect of the lubricating layer L due to the electromagnetic field M is equal to or greater than the effect of the lubricating layer L forcibly formed in advance.

If it is determined in step S5 that the pumping load has not been confirmed in advance, the process returns to step S4 to adjust the magnitude and frequency of the current to the coils 11a and 12a. On the other hand, if it is determined in step S5 that the pumping load has been confirmed in advance, the electromagnetic field condition (condition of the electromagnetic field M) is set (step S6). At this time, the magnitude and frequency of the current to the adjusted coils 11a and 12a are fixed. After that, the admixture is supplied from the admixture supply unit 18 to the inside of the transport pipe 1 and the earth and sand 10 which is a fluid material is pumped (step S7 of pumping the fluid material). After the pumping of the earth and sand 10 is completed, a series of steps is completed.

Next, the action and effect obtained from the pumping method of the fluid material according to the present embodiment will be described in detail. In the pumping method according to the present embodiment, as shown in FIG. 4, the coils 11a and 12a that generate the electromagnetic field M are wound around the transport pipe 1 and a current is passed through the coils 11a and 12a. Therefore, since the configuration for pumping the earth and sand 10 can be simplified, the work of installing the coils 11a and 12a in the transport pipe 1 can be appropriately performed.

Further, as shown in FIG. 5, after winding the coils 11a and 12a that generate the electromagnetic field M around the transport tube 1, and before the step of passing a current through the coils 11a and 12a, the inner surface 1c of the transport tube 1 The lubricating layer L is formed on the surface. Then, the pumping load in the transport pipe 1 on which the lubricating layer L is formed is confirmed. In the confirmation of the pumping load, the effect when the earth and sand 10 is pumped can be confirmed, so that the condition when the effect at the time of pumping becomes remarkable can be extracted.

Specifically, the magnitude of the current to the coils 11a and 12a when the effect at the time of pumping becomes remarkable, and the frequency of the current can be confirmed for each construction site A. Therefore, by adjusting the current and frequency to the coils 11a and 12a so as to have a pumping load confirmed in advance, the earth and sand 10 can be pumped so as to exert a remarkable effect. Therefore, the earth and sand 10 can be efficiently pumped by confirming in advance the effect of pumping according to the site A.

Further, in the step of pumping the earth and sand 10, as shown in FIG. 1, the earth and sand 10 is pumped from the underground G toward the ground T. Generally, in the work of pumping earth and sand from underground to the ground, if the sediment cannot be efficiently pumped inside the transport pipe, vibration and noise of the transport pipe are likely to occur. On the other hand, in the pumping method according to the present embodiment, the pumping load is confirmed in advance to confirm the effect when the earth and sand 10 is pumped, and the current to the coils 11a and 12a when the effect during pumping becomes remarkable. And since the frequency can be confirmed, it is possible to efficiently pump the earth and sand 10 from the underground G to the ground T. Therefore, the vibration and noise of the transport pipe 1 can be suppressed.

Further, in the step of pumping the earth and sand 10, the earth and sand 10 generated in the shield work is pumped inside the transport pipe 1. In the shield work, the excavated earth and sand are pumped by the transport pipe, but as mentioned above, when the fluidity of the excavated earth and sand inside the transport pipe is small, friction generated between the inner surface of the transport pipe and the earth and sand growing. As a result, it may not be possible to efficiently pump the excavated soil. However, in the pumping method according to the present embodiment, the pumping load can be confirmed in advance, and the current and frequency to the coils 11a and 12a when the effect at the time of pumping becomes remarkable can be confirmed. Therefore, by confirming the pumping load in advance, it is possible to efficiently pump the earth and sand generated by the shield work.

Further, in the step of pumping the earth and sand 10, the admixture is pumped together with the earth and sand 10. Therefore, by injecting the admixture whose fluidity is increased by the electromagnetic action into the inside of the transport pipe 1, the earth and sand 10 can be pumped more efficiently inside the transport pipe 1. Therefore, by pumping the admixture together with the earth and sand 10, the friction generated between the inner surface 1c of the transport pipe 1 and the earth and sand 10 can be suppressed, which contributes to further improvement of the pumping property.

Further, the coil 11a is provided on the upstream side of the sediment introduction portion 1A in the transport path of the sediment 10, and the coil 12a is provided on the upstream side of the horizontally extending portion 1B in the transport path of the sediment 10. Therefore, since the effect of the lubricating layer L formed on the upstream side is maintained up to the downstream side, the possibility that the transport pipe 1 is blocked can be suppressed more reliably. That is, by arranging the coils 11a and 12a on the upstream side of the transfer path of the transfer pipe 1 (for example, the upstream side of the intermediate point of the transfer path of the transfer pipe 1), the long lubricating layer L along the inside of the transfer pipe 1 Therefore, the effect of friction reduction by the lubricating layer L can be made more remarkable. The arrangement positions of the coils 11a and 12a are not limited to the above example and can be changed as appropriate. For example, the coil may be arranged at the position of the secondary soil removal pump 5 g.

The embodiment of the pumping method of the fluid material according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and may be modified or applied to other things without changing the gist described in each claim. That is, the contents and order of each step of the pumping method, and the configuration of each part of the transport pipe and each device for pumping can be appropriately changed.

For example, in the above-described embodiment, the transport pipe 1 including the sediment introduction portion 1A, the horizontal extension portion 1B, the vertical extension portion 1C, and the sediment discharge portion 1D has been described, but the configuration of the transport pipe can be changed as appropriate. Further, in the above-described embodiment, the excavator 2 provided with the cutter 2a, the mixing blade 2b, the cutter motor 2c, the shield jack 2d, and the mud-making soil material injection hole 2e has been described. However, the configuration of the excavator can be changed as appropriate.

Further, in the above-described embodiment, as shown in FIG. 3, an example in which the coils 11a and 12a are attached to the transfer pipe 1 via the band 13 has been described, but the configuration of the band can be changed as appropriate. For example, the band includes a plurality of cables constituting the coils 11a and 12a, a sheet-shaped cable holding member wound around the transport tube 1 and holding the plurality of cables, and a connector provided at the end of each cable. May be a coil installation member in which the coils 11a and 12a are configured by connecting the connector provided at the end of one cable to the connector provided at the end of the other cable.

In the coil installation member described above, the coils 11a and 12a installed in the transport pipe 1 are easily configured by winding a sheet-shaped cable holding member around the transport pipe 1 and connecting each of the plurality of cables to each other by a connector. be able to. Therefore, since the coils 11a and 12a can be efficiently installed in the transport pipe 1 in the construction work, the work of pumping the earth and sand 10 can be efficiently performed. As a result, the construction period can be shortened.

Further, in the above-described embodiment, the example in which the admixture supply unit 18 is provided has been described, but the admixture supply unit may be omitted. Further, in the above-described embodiment, the transport pipe 1 for pumping the earth and sand 10 has been described, but the pumping method according to the present invention can also be applied to the transport pipe for pumping a fluid material other than the earth and sand. The pumping method according to the present invention can also be applied to a transport pipe for pumping a fluid material such as concrete in a plant for producing concrete by mixing water, cement and aggregate, for example.

Further, in the above-described embodiment, the example of the site A in which the earth and sand hopper 3 and the dump truck 4 are provided has been described, but the earth and sand hopper or the dump truck may be omitted, and the type of the site is not limited to the above-mentioned site A. It can be changed as appropriate. Further, in the above-described embodiment, the pumping method of the earth and sand 10 used at the site A where the shield work is performed has been described, but the pumping method according to the present invention can also be applied to the site where the work other than the shield work is performed.

The pumping method according to the present invention can be applied to, for example, the site of urban civil engineering where problems of noise and vibration are likely to occur. As described above, the pumping method according to the present invention is effective even when applied to urban civil engineering because noise and vibration can be suppressed by efficiently pumping a fluid material. Further, the pumping method according to the present invention can be applied to, for example, a site of dredging sedimentation of a dam, a site of railway construction, or a site of an open caisson.

(Example)
Next, an example of the pumping method according to the present invention will be described with reference to FIG. 7. The present invention is not limited to the following examples. FIG. 7 is a diagram showing an experimental site B in which an experiment of the pumping method according to the above-described embodiment was performed. At the experimental site B, a transfer pipe 21 for pressure-feeding the fluid material, a pump 22 for pressure-feeding the fluid material in the transfer pipe 21, a pressure gauge 23 and a flow meter 24 provided in the transfer pipe 21, and the coil described above. A plurality of coils 25 similar to the 11a and 12a, and a power supply device 26 similar to the power supply device 15 for supplying a current to the coils 25 are provided. Although the power supply device 26 is connected to each of the plurality of coils 25, the illustration of the power supply device 26 and the like is simplified in FIG. 7.

The total length of the transport pipe 21 is 100 m. One end and the other end of the transfer pipe 21 are connected to the pump 22. The transport pipe 21 extends linearly from the pump 22 in the first direction D1. The transport pipe 21 extending from the end on the pump 22 side of the first direction D1 to the end on the opposite side of the pump 22 is folded back at the opposite end and extends toward the pump 22. The transport pipe 21 extends in the second direction D2 that intersects the first direction D1 while meandering in the first direction D1. The plurality of coils 25 are wound around the position R where the distance from the pump 22 of the transport pipe 21 is 0 m or more and 20 m or less (preferably 0 m or more and 10 m or less).

FIG. 8 shows the results of forming a lubricating layer L on the inner surface of the transport pipe 21 at the above experimental site B, measuring the pressure inside the transport pipe 21 with each pressure gauge 23, and measuring the electrical load of the pump 22. It is shown in the graph. FIG. 8 shows the time-series changes in the measured in-pipe pressure and electrical load. As shown in FIG. 8, at the experimental site B, the pressure inside the pipe decreases after a certain period of time has elapsed (5 minutes after EMF ON) after the lubricating layer L is formed, and the electrical load (current) of the pump 22 is reduced. ) Is down.

On the other hand, at an experimental site different from the experimental site B, a lubricating layer L was formed on the inner surface of the transfer pipe, the pressure inside the transfer pipe was measured by a pressure gauge, and the electric load of the pump was measured. It is shown in the graph of. As shown in FIG. 9, at the experimental site different from the experimental site B, the electrical load (current) of the pump 22 is reduced after a certain period of time has elapsed (from EMF ON) after the lubricating layer L is formed, but in the pipe. The pressure has increased slightly.

As described above, it was found that even if the lubricating layer L is formed, the effect differs depending on the experimental site. Then, in this embodiment, this effect is confirmed in advance as a pumping load, and the power is supplied from the power supply device 26 to the coil 25 so as to be the pumping load confirmed in advance. Of these, the good effect can be surely exhibited. Therefore, even when the pumping method according to the embodiment is applied to various sites, the effect of enhancing the pumping property can be surely obtained, so that it is possible to provide a highly versatile pumping method.

1,21 ... Conveyor pipe, 1A ... Soil introduction part, 1B ... Horizontal extension part, 1C ... Vertical extension part, 1D ... Sediment discharge part, 1a ... Intake port, 1b ... Outer surface, 1c ... Inner surface, 2 ... Excavator 2, 2a ... cutter, 2b ... mixing wing, 2c ... cutter motor, 2d ... shield jack, 2e ... mud soil injection hole, 3 ... earth and sand hopper, 4 ... dump truck, 5a ... pump, 5b ... driver's trolley, 5c ... Power unit trolley, 5d ... Control panel trolley, 5e ... Soil soil material trolley, 5f ... Transformer trolley, 5g ... Secondary soil removal pump, 5h ... Telescopic pipe, 5j ... Material trolley, 5k ... Soil removal pump, 6 ... Screw conveyor, 10 ... Soil (fluid material), 11, 12 ... Coil group, 11a, 12a, 25 ... Coil, 13 ... Band, 15, 26 ... Power supply device, 16, 23 ... Pressure gauge, 17, 24 ... Flow meter, 18 ... Admixture supply unit, A ... Site, B ... Experimental site, C ... Space, D1 ... 1st direction, D2 ... 2nd direction, G ... Underground, L ... Lubricating layer, M ... Electromagnetic field, T ... Ground.

Claims (3)

It is a pumping method in which the fluid material used in construction is pumped inside the transport pipe.
The process of winding a coil that generates an electromagnetic field around the transport tube, and
The process of forming a lubricating layer on the inner surface of the transport pipe and
The step of confirming the pumping load in the transport pipe on which the lubricating layer is formed, and
A step of passing a current through the coil so as to have the pumping load confirmed in the step of confirming the pumping load, and a step of passing a current through the coil.
In the step of passing a current through the coil, the step of pumping the fluid material with the current flowing through the coil and the step of pumping the fluid material.
Equipped with
In the step of forming the lubricating layer, a simulated lubricating layer is formed before passing an electric current through the coil.
In the step of confirming the pumping load, the pumping load is confirmed with the simulated lubricating layer formed.
In the process of passing an electric current through the coil,
The magnitude and frequency of the current to the coil are adjusted, and it is determined whether or not the pumping load of the fluid material inside the transport pipe is the pumping load confirmed in advance.
If it is determined that the pumping load has not been confirmed in advance, the magnitude and frequency of the current to the coil are adjusted.
When it is determined that the pumping load is confirmed in advance, the step of fixing the magnitude and frequency of the current to the coil and then pumping the fluid material is executed.
In the step of pumping the fluid material, the admixture is pumped together with the fluid material.
The admixture is a foam material for shield work used for stabilizing the face.
Pumping method. In the step of pumping the fluid material, the fluid material is pumped from underground to above ground.
The pumping method according to claim 1. In the step of pumping the fluid material, the earth and sand generated in the shield work is pumped inside the transport pipe.
The pumping method according to claim 1 or 2 .

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