JP7054907B2 - Long-distance pumping method for fluid materials - Google Patents

Description

The present invention relates to a method for long-distance pumping of a fluid material used for underground space construction.

The applicant of the present application proposes a method shown in Patent Document 1 regarding a technique of pumping a fluid material used for underground space construction by a pump arranged on the ground.
In Patent Document 2, as a method of long-distance pumping injection of a cement-based filler, liquid A prepared by adding a first thickener and a second thickener to cement and water, an inorganic filler, and water are described above. In the long-distance pressure feeding injection method of a cement-based filler to be applied after mixing 1 thickener and liquid B prepared by adding the 2nd thickener to thicken the thickening agent, the liquid A and the liquid B are used. It is proposed that the liquid A and the liquid B are mixed and injected via a stirrer immediately before the construction unit by pumping them over a long distance with separate pipes.

Patent Documents 3 and 4 propose a cement admixture for long-distance pumping, an injection method thereof, and the like, and particularly improve the fluid material to realize long-distance pumping.
However, in any of these proposals, the proposal was made on the premise that the fluid material was pumped from the upstream side of a long-distance route of 1000 m or more to the downstream end with one pump.

Japanese Patent No. 4098675 Japanese Unexamined Patent Publication No. 2009-24481 Japanese Patent No. 5773957 Japanese Patent No. 5882146

An object of the present invention is to fundamentally review the long-distance pumping method itself of a fluid material used for underground space construction, and to provide a new method capable of efficient long-distance pumping.

The present invention realizes efficient long-distance pumping by the following method in a long-distance pumping method for transferring a fluid material used for underground space construction or the like over a long-distance route of 1000 m or more.
In the present invention, as in the conventional method, the supply source of the fluid material is arranged on the upstream side of the long-distance route, and the pumping path is provided from the upstream end to the downstream end of the long-distance route. However, it is characterized in that the pumping path is divided into a plurality of unit sections and an autonomous transfer system is arranged for each unit section. This autonomous transfer system includes a pump for pumping located at the upstream end of the unit interval and a control device for controlling the operation of the pump for pumping, and the control device previously performs the pump at the upstream end of the unit interval. When the fluid material that satisfies the set operating conditions has arrived, the pump for pumping at the upstream end of the unit interval is operated to send the fluid material downstream. Then, by sequentially operating the autonomous transfer system in these plurality of unit sections, it is possible to pump the fluid material from the supply source to the downstream end of the pumping path.

The control device includes a sensor that detects the arrival state that satisfies the operation condition, and can be implemented as controlling the operation of the pump for pumping based on the detection result of the sensor. That is, in the autonomous transfer system, the pump for pumping is operated according to the detection result of the sensor, and the fluid material can be pumped from the upstream end to the downstream end of the unit section. By sequentially performing this, it is possible to pump the fluid material from the supply source to the downstream end of the pumping path.
More specifically, as the sensor, a pressure sensor that senses the pressure in the pressure feeding path on the upstream side of the pump can be adopted. Then, the pressure feeding pump is operated on the condition that the pressure sensor detects a high pressure equal to or higher than the preset operating pressure, and the pressure feeding is performed on the condition that the pressure sensor detects a low pressure equal to or lower than the preset stopping pressure. By controlling the operation of the pump for pumping so as to stop the pump, the autonomous transfer systems can operate independently and autonomously, and at the same time, these autonomous transfer systems flow. As a result of coordinating with each other according to the movement of the sex material, the autonomy of each is organically linked, and the fluid material from the source can be continuously pumped to the downstream end of the long-distance route. It is a thing.

INDUSTRIAL APPLICABILITY The present invention has been able to provide a method for long-distance pumping of a fluid material capable of efficient long-distance pumping.
In the present invention, it is possible to perform long-distance pumping at a relatively small pressure with a relatively small output pump as compared with the case of performing long-distance pumping at high pressure with one large pump, which is safe. It was possible to realize highly efficient and efficient long-distance pumping at low cost.

Explanatory drawing of the long-distance pumping method which concerns on embodiment of this invention. Explanatory drawing of the autonomous transfer system of the same long-distance pumping method. The flowchart of the control device of the autonomous transfer system of the same long-distance pumping method.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Outline of long-distance space 10)
The long-distance space 10 shown in this embodiment is a space for shield construction, and includes a shaft 11 and a side shaft 12. The shaft 11 is a space extending downward from the ground 13 to a predetermined depth, and is generally a vertical space, but it may be inclined, and the depth is obtained in any case. It is a space formed in the ground for the purpose of doing so. The horizontal shaft 12 is a space extending laterally from the shaft 11 to a predetermined length, and is generally a horizontal space, but it may be inclined, and in any case, a horizontal distance. It is a space formed in the ground for the purpose of obtaining. The horizontal shaft 12 may be sequentially extended as the construction progresses, but in the present invention, it is formed over a long-distance route L of 1000 m or more.

A supply source 14 for a fluid material such as a hopper, a mixer truck, or a vacuum truck is arranged on the ground 13. The supply source 14 may be arranged in the underground space. In the example of FIG. 1, the supply source 14 on the ground 13 is lowered underground by the vertical pipe 16, and the long-distance route L is transferred by the horizontal pipe 17. The vertical pipe 16 is arranged in the shaft 11, and the horizontal pipe 17 is arranged in the horizontal shaft 12. The transfer in the vertical pipe 16 may be a free fall or a pumping may be performed. Further, in tunnel construction, since the shaft 11 is not normally required, the horizontal shaft 12 constitutes the long-distance route L.

(Long-distance pumping in the horizontal shaft 12)
In the shield work, the flow of earth and sand, mortar, and fluidized soil (also called soil mortar) in the backfill space between the surface of the excavation pit and the segment placed on the inner peripheral surface of the excavation pit. It is common to prevent the occurrence of a collapse accident by putting a sex material as a backfill material and filling it in the backfill space. As the fluid material, various types of mortar (general mortar, foamed mortar, poorly mixed mortar with low cement content) and fluidized soil (predetermined amount of cement, water and particle size were controlled). In addition to (earth and sand such as construction surplus soil), plastic grout material and urethane foam can also be mentioned, and their uses are in long-distance space 10 such as filling in pipes, pavement in space, spray coating, etc. in addition to the above-mentioned backfill material. Various fluid materials for civil engineering construction used for civil engineering construction work can be shown.

In the long-distance pumping method according to this embodiment, the fluid material is pumped from the upstream end to the downstream end by a pump over a long-distance route L. When pumping a long-distance path L of 1000 m or more from the upstream end to the downstream end with a single pump, a high-pressure pump exceeding 0.3 Mpa is required, and the pumping path such as pipes and hoses is also required. You need something that can withstand high pressure.
On the other hand, the long-distance pumping method according to this embodiment realizes efficient and economical long-distance pumping by using a pump having a relatively small output and a pumping path having a relatively small compressive strength. Is.

(About long-distance route L)
As a means for performing long-distance pumping at low cost and efficiently, in this embodiment, the long-distance route L composed of the vertical pipes 16 is divided into a plurality of unit sections, and each unit section is autonomous. It is for arranging a transfer system. In FIG. 1, only two sections, the first section L1 and the second section L2, are shown as unit sections, but the number of unit sections can be increased one after another in the third and fourth sections. It should be noted that the appropriate length of one unit section is about 200 to 600 m, but the length of the unit section can be appropriately changed.

(Overview of autonomous transfer system)
The autonomous transfer system is a pump 21 (first sensor s1, second sensor s2) arranged at the upstream end of the unit section 20 (first section L1, second section L2) and a control for controlling the operation thereof. The device 22 is provided. The control device 22 operates the pump 21 for pumping at the upstream end of the unit section to send the fluid material downstream in a state where the fluid material satisfying the preset operating conditions reaches the upstream end of the unit section 20. It is a thing.

The pump 21 for pumping (first sensor s1, second sensor s2) is not particularly limited as long as it can pump a fluid material, and various types of pumps such as a sand pump can be adopted. ..
Then, by sequentially operating the autonomous transfer system of these unit intervals 20, the fluid material from the supply source 14 can be pumped to the downstream end of the long-distance route L.

In particular, the autonomous transfer system can operate autonomously, and as a result, information transmission connecting all the pumps 21 such as wiring even if there is no worker in the pumps 21 for pumping in each unit interval 20. The fluid material from the supply source 14 can be pumped to the downstream end of the long-distance route L without any means.

(Control device for each autonomous transfer system)
The control device 22 includes sensors 23 (first sensor s1, second sensor s2) that detect the arrival state that satisfies the operation condition, and controls the operation of the pump 21 for pumping based on the detection result of the sensor 23. Therefore, the autonomous transfer system can pump the fluid material from the upstream end to the downstream end of the unit interval 20 without being given another control signal by the sensing result of the sensor 23.

As the sensor 23, a pressure sensor that senses the pressure in the pressure feeding path (vertical pipe 16) on the upstream side of the pressure feeding pump 21 can be applied. The sensor 23 may be arranged immediately before the pressure feeding pump 21, but its position is not particularly limited as long as it is on the upstream side of the pressurized portion inside the pressure feeding pump 21. Further, it may be arranged in a range affected by pressure fluctuation due to the operation and stop of the pressure feeding pump 21, such as on the upstream side of several meters from the pressure feeding pump 21.

The control device 22 operates the pressure feeding pump 21 on condition that the sensor 23 senses a high pressure equal to or higher than a preset operating pressure. Further, the pressure feeding pump 21 is stopped on the condition that the sensor 23 detects a low pressure equal to or lower than the preset stop pressure.
For example, the working pressure (sometimes referred to as high pressure) can be about 0.05Mpa, and the stopping pressure (sometimes referred to as low pressure) can be a negative pressure of about 0 to −0.004Mpa. The pressure between the operating pressure (high pressure) and the stopping pressure (low pressure) is referred to as an intermediate pressure in the following description.

(Specific example of control)
The control in the control device 22 can be carried out by various methods, and an example thereof will be described with reference to FIG.
Step 101: The sensor 23 detects the pressure in the pipe.

Step 102: The control device 22 determines whether or not the detected pressure is equal to or higher than the operating pressure (high pressure).
Step 103: When the operating pressure (high pressure) or higher, the control device 22 determines whether or not the pressure feeding pump 21 is in the operating state.
When the pump 21 for pumping is in the operating state, the process is completed and the control device 22 continues in the operating state.

Step 104: When the pump 21 for pumping is not in the operating state (when it is in the stopped state), the control device 22 is operated.

Step 105: In step 102, when the detected pressure is lower than the operating pressure (high pressure), the control device 22 determines whether or not the detected pressure is equal to or less than the stopping pressure (low pressure).
If it is higher than the stop pressure (low pressure), the process ends and the control device 22 continues the current state (operating state or stopped state).

Step 106: When the stop pressure (low pressure) or less, the control device 22 determines whether or not the pressure feeding pump 21 is in the operating state.
If the pump 21 for pumping is not in the operating state (in the stopped state), the process is completed and the control device 22 continues in the stopped state.
Step 107: When the pump 21 for pumping is in an operating state, an instruction to stop the control device 22 is sent to the pump 21 for pumping.

As a result of the above, once the in-pipe pressure in the sensor 23 rises above the working pressure (high pressure), the pressure-feeding pump 21 is in the operating state, and the pressure-feeding pump until the in-pipe pressure becomes equal to or lower than the stop pressure (low pressure) in the sensor 23. The operating state of 21 continues. On the other hand, when the in-pipe pressure in the sensor 23 drops below the stop pressure (low pressure), the pressure feed pump 21 is stopped, and the pressure feed pump 21 is stopped until the in-pipe pressure becomes equal to or higher than the operating pressure (high pressure) in the sensor 23. The state continues.

In other words, at the intermediate pressure, the previous state (operating state or stopped state) is continued. Thereby, as described below, the autonomous transfer system of each unit section 20 can autonomously send the fluid material from the upstream end to the downstream end of the unit section 20, and the unit section 20 of these long-distance routes L can be sent. Each autonomous transfer system of is operated sequentially. As a result, the fluid material from the supply source 14 is sequentially pumped to the downstream end of the long-distance route L.

In addition, in order to prevent malfunction due to the generation of primary high pressure or low pressure due to unexpected pulsation, etc., the detection of operating pressure (high pressure) or stopping pressure (low pressure) is performed for a predetermined time (1 second or less or a few seconds or so). The pressure feeding pump 21 may be changed to the operating state or the stopped state as a detection of the operating pressure (high pressure) or the stopping pressure (low pressure) by continuously (for several seconds).

Further, the manual input unit 25 may be connected to the control device 22 or directly provided on the pump 21 for pumping so that the operator can switch between operation and stop. Further, it does not prevent the remote input means from being used in combination so that all the pumps 21 for pumping can be stopped or operated from the ground or the like.

(Specific process of long-distance pumping method)
The specific process of the long-distance pumping method will be described with reference to Table 1.

(Step 0)
Step 0 is a state before the start of the transfer work of the fluid material. In this state, the fluid material is at the supply source 14 on the ground 13, and there is no fluid material in the vertical pipe 16 and the horizontal pipe 17 (first section L1, second section L2), and all pumps are pumped. The pump 21 (in this example, the first pump for pumping p1 and the second pump for pumping p2) is in a stopped state, and the first sensor s1 and the second sensor s2 detect the intermediate pressure.

(Step 1)
Step 1 is a state in which the transfer work of the fluid material has begun to start. In this state, the fluid material is sent through the shaft 11 to reach the first sensor s1. Immediately after this arrival, the first pump for pumping p1 is not yet operating, the pressure increases as the fluid material is fed, and the first sensor s1 detects the high pressure. Upon detection of this high pressure, the first pump for pumping p1 is activated to start pumping the fluid material.
At the beginning of pumping, since the fluid material has not reached the second section L2, the second sensor s2 is in a state of detecting the intermediate pressure, and the second pumping pump p2 is stopped.
At the start stage of the work, the worker may operate the first pump for pumping p1 by the manual input unit 25 for safety confirmation.

(Step 2)
Step 2 is a state in which the fluid material reaches the second sensor s2. Immediately after this arrival, the second pump for pumping p2 is not yet operating, the pressure increases as the fluid material is fed, and the second sensor s2 detects the high pressure. Upon detection of this high pressure, the second pump for pumping p2 is activated to start pumping the fluid material.

As long as the supply of the fluid material from the supply source 14 is continued, the fluid material is continuously fed by the first pump for pumping p1 into the first section L1, but the operation of the first pump for pumping p1 is started. Along with this, the pressure inside the pipe where the first sensor s1 is located decreases from high pressure to intermediate pressure, but the operating state of the first pressure feeding pump p1 continues.

(Step 3)
Step 3 is a state in which the transfer of the fluid material continues smoothly. As long as the supply of the fluid material from the supply source 14 is continued, the fluid material is continuously fed into the first section L1 and the second section L2 by the first pump for pumping p1 and the pump for second pumping p2. .. With the operation of the first pump 1 and the second pump p2, the pressure inside the pipe where the first sensor s1 and the second sensor s2 are located decreases from high pressure to the intermediate pressure, but the first pump p1 and the second pump p1 and the second. The operating state of the pump for pressure feeding p2 continues.

In this way, the autonomous transfer system of all the unit sections 20 (first section L1, second section L2) operates autonomously and sequentially, so that the fluid material is fed from the base end to the tip of the long-distance route L. Will be gone.

(Step 4)
Step 4 is a state in which the supply of the fluid material from the supply source 14 is stopped. The supply stop occurs, for example, when the fluid material in the hopper is emptied, or when the tank of the vacuum truck is emptied and the line is switched to the next vacuum truck.
When the supply of the fluid material from the supply source 14 is stopped, the fluid material is lost inside the vertical pipe 16 and the state is reduced. On the other hand, since the operation of the first pressure feeding pump p1 continues, the in-pipe pressure in the first sensor s1 becomes a low pressure state such as a negative pressure, and the first sensor s1 senses the low pressure.
By sensing this low pressure, the first pump for pumping p1 is stopped, but there is a fluid material inside the first section L1, and the second sensor s2 continues to detect the intermediate pressure, and the second The pump for pumping p2 is kept in an operating state.

(Step 5)
In step 5, the supply of the fluid material from the supply source 14 is stopped, the first pump for pumping p1 is stopped, but the operation of the second pump for pumping p2 is continued, so that the inside of the first section L1 is reached. Will be in a declining state, such as running out of fluid material. On the other hand, since the operation of the second pressure feeding pump p2 continues, the pressure inside the pipe in the second sensor s2 becomes a low pressure state such as a negative pressure, and the second sensor s2 senses the low pressure.

By sensing this low pressure, the second pump for pumping p2 is stopped, but a fluid material exists inside the second section L2.
When more sections such as the third section are set, the fluid material in the unit section 20 is sequentially reduced, and the most advanced unit section 20 is the state of the second section L2 in this example. Will be.

(Step 6)
Step 6 is a state in which the transfer work of the fluid material is restarted. In this state, the fluid material is sent through the shaft 11 to reach the first sensor s1. Immediately after this arrival, the first pump for pumping p1 is not yet operating, the pressure increases as the fluid material is fed, and the first sensor s1 detects the high pressure. Upon detection of this high pressure, the first pump for pumping p1 is activated to start pumping the fluid material.
At the beginning of pumping, the fluid material has not reached the second section L2, so the second sensor s2 is in the state of detecting the intermediate pressure, the second pumping pump p2 is stopped, and the second section. The fluid material before resumption remains in L2.

(Return to step 2)
After the fluid material for which pumping has been resumed reaches the second sensor s2, the state is the same as in step 2, and the pump 21 for pumping in all the preparation unit sections 20 operates to feed the fluid material.
Further, as the supply of the fluid material continues, the process proceeds to step 3 and the transfer of the fluid material is continued.

(Step 7)
From step 7 onward, all the fluid material in the pump 21 for pumping (in this example, the first section L1 and the second section L2) is discharged from the tip of the long-distance route L, such as when the transfer work of the fluid material is completed. It is a process that ends up.

First, in carrying out step 7, an air supply source 26 such as a compressor is connected to the base end of the vertical pipe 16 or the horizontal pipe 17. High-pressure air is converted from the air supply source 26 into a fluid material supply and introduced.
With the introduction of this high-pressure air, all the sensors 23 (first sensor s1, second sensor s2) sequentially detect high pressure, and all pumps 21 for pumping (first pump p1, regardless of the working state). The second pump for pumping p2) is sequentially operated, and the fluid material is discharged from the tip of the long-distance route L from all the unit sections 20 (first section L1, second section L2).
Although not shown in Table 1, when the introduction of high-pressure air is stopped, the first sensor s1 and the second sensor s2 may detect intermediate pressure, but even in that case, in the case of step 3. Similarly, the operating state of the first pressure feeding pump p1 and the second pressure feeding pump p2 continues.

(Step 8)
Step 8 is a step of cleaning the inside of the unit section 20 (first section L1, second section L2). It is desirable that this step be performed following step 7.

This step 8 is performed after temporarily stopping the introduction of the high-pressure air from the air supply source 26. As a result, the pressure inside the pipe is stopped, all the sensors 23 (first sensor s1, second sensor s2) sequentially detect the intermediate pressure, and all the pumps 21 for pumping (first pumping pump p1, second pumping pump). p2) is in the stopped state.
In this state, the washing water supply source 27 such as a water tank or a water supply is connected to the base end of the vertical pipe 16 or the horizontal pipe 17, and the washing water is introduced into the unit section 20 from the washing water supply source 27. Since the high pressure is not obtained only by introducing the washing water from the washing water supply source 27, all the sensors 23 (first sensor s1 and second sensor s2) maintain the state of detecting the intermediate pressure, and all the pumps 21 for pumping. (The first pump for pumping p1 and the second pump for pumping p2) are maintained in a stopped state.

(Step 9)
In step 9, the introduction of high-pressure air from the air supply source 26 is restarted after the addition of the washing water is completed. With the introduction of this high-pressure air, all the sensors 23 (first sensor s1, second sensor s2) sequentially detect high pressure, and all pumps 21 for pumping (first pumping pump p1, second pumping pump p2). Is sequentially operated regardless of its operating state, wash water is supplied to all unit sections 20 (first section L1, second section L2), and is discharged from the tip of the long-distance route L.

Although not shown in Table 1, when the introduction of high-pressure air is stopped, the first sensor s1 and the second sensor s2 may detect the intermediate pressure, but even in that case, the same as in the case of step 3. The operating state of the first pump for pumping p1 and the pump for second pumping p2 continues.

(Step 10)
Step 10 is a step of stopping the introduction of high-pressure air and stopping the operation of all the pumps 21 for pumping (first pumping pump p1 and second pumping pump p2). As described above, if the introduction of high-pressure air is simply stopped, the pressure drops to the intermediate pressure, and the first pump for pumping p1 and the pump for second pressure feeding p2 do not stop. Therefore, by closing the valve (not shown) provided in the vertical pipe 16 to shut off the pipe connected to the first pressure feed pump p1, the pressure inside the pipe at the position where the first pressure feed pump p1 is provided. Drops to low pressure and the first sensor s1 stops. Along with the stop of the first sensor s1, the pressure inside the pipe of the first section L1 also decreases, and the second sensor s2 detects the low pressure, so that the second pump for pumping p2 stops.

Instead of shutting off the above piping, the worker also operates the manual input unit 25, such as turning off the switch of the first pump for pumping p1 and the pump for second pumping p2, for the final inspection. The pump for pumping p1 and the pump for second pumping p2 may be stopped.

(Advantages of the long-distance pumping method according to the embodiment)
In the long-distance pumping method according to this embodiment, a plurality of pumps are used, but the autonomous transfer system allows the plurality of pumps 21 to operate independently while the fluid material is used. Since each of them operates in cooperation with each other according to the moving state, the fluid material can be pumped from the base end to the tip of the long-distance route L without a worker being attached to all the pumps 21 for pumping.
Therefore, long-distance pumping can be smoothly carried out without significantly increasing the number of workers.

In terms of the device, in the long-distance pumping method according to this embodiment, a relatively small sand pump with a maximum pressure of 0.8Mpa is adopted as the pump 21 for pumping capable of pumping about 500 m. By using four sand pumps and continuously providing four autonomous transfer systems, it is possible to carry out long-distance pumping of about 2000 m. Further, a steel pipe having a wall thickness of 4.5 mm and a weight of 12.2 kg / m per unit meter is sufficient as long as it has a relatively small compressive strength.

On the other hand, when performing long-distance pumping with one pump, it is necessary to adopt a relatively large special pump with a maximum pressure of 5.5Mpa as a pump for pumping capable of pumping about 2000 m or more. Occurs. The compressive strength used with the adoption of this special pump is required to have a relatively large pressure resistance, and it is necessary to use a steel pipe having a wall thickness of 7.1 mm and a weight of 18.8 kg / m per unit meter. Therefore, the total equipment and operating cost are significantly smaller in the long-distance pumping method according to this embodiment than in the case of long-distance pumping with one pump.

In particular, it is difficult for pumps to completely suppress pulsation. This pulsation tends to increase as the maximum pressure of the pump increases regardless of the type of pump. Since this pulsation gives a large impact to the pipe, a large impact is applied to the pipe as the maximum pressure of the pump used increases, and from this point as well, in the long-distance pumping method according to this embodiment. Will show sufficient durability even if a pipe with a relatively small pressure resistance is used. Moreover, the greater the pressure of the fluid material to be pumped, the greater the impact in the event of an accident.

Therefore, in the long-distance pumping method according to this embodiment, it is possible to provide an efficient pumping method showing high safety at low cost.

L Long-distance route L1 First section L2 Second section p1 First pumping pump p2 Second pumping pump s1 First sensor s2 Second sensor 10 Long-distance underground space 11 Vertical shaft 12 Horizontal shaft 13 Ground 14 Supply source 16 Vertical pipe 17 Horizontal pipe 20 Unit section 21 Pump for pumping 22 Control device 23 Sensor 25 Manual input unit 26 Air supply source 27 Washing water supply source

Claims (9)

In a long-distance pumping method in which fluid materials used for underground space construction are transferred from a source over a long-distance route of 1000 m or more.
The long-distance route is divided into a plurality of unit sections, and an autonomous transfer system is arranged for each unit section.
The autonomous transfer system includes a pump for pumping located at the upstream end of the unit interval and a control device for controlling the operation of the pump for pumping.
The control device operates the pump for pumping at the upstream end of the unit section in a state where the fluid material satisfying the preset operating conditions reaches the upstream end of the unit section to bring the fluid material. It is in a sending state to send to the downstream.
Long-distance pumping of a fluid material, characterized in that the autonomous transfer system of the plurality of unit intervals is sequentially activated to pump the fluid material from the source to the downstream end of the long-distance route. Method. The control device includes a sensor that detects the arrival state that satisfies the operation condition, and controls the operation of the pump for pumping based on the detection result of the sensor.
The autonomous transfer system is characterized in that the pump for pumping is operated according to the sensing result of the sensor, and the fluid material can be pumped from the upstream end to the downstream end of the unit interval. The long-distance pumping method according to claim 1. The sensor is a pressure sensor that senses pressure in the long-distance path upstream of the pump, and the pump for pumping is provided on condition that the pressure sensor detects a high pressure higher than a preset operating pressure. The second aspect of claim 2, wherein the pressure sensor controls the operation of the pressure feeding pump so as to stop the pressure feeding pump on the condition that the pressure sensor is operated and the pressure sensor detects a low pressure equal to or lower than a preset stop pressure. Long-distance pumping method for fluid materials. The pump for pumping at the upstream end of the unit section, with the fluid material remaining in the unit section, in a state where the fluid material satisfying the operating conditions does not reach the upstream end of the unit section. Is stopped and
The supply of the fluid material is restarted from the stopped state, and the unit section is set to the feed state in a state where the fluid material satisfying the operating conditions preset in advance reaches the upstream end of the unit section. The long-distance pumping method for a fluid material according to any one of claims 1 to 3. In a state where the fluid material does not reach the upstream end of the unit section, the pump for pumping at the upstream end of the unit section is stopped while the fluid material remains in the unit section.
By supplying pressurized air to the upstream end of the unit section and setting the pump for pumping at the upstream end of the unit section to the operating state, the fluid material in the unit section is sent to the downstream side. The long-distance pumping method for a fluid material according to any one of claims 1 to 3, wherein the unit interval is emptied. In a state where the unit section is empty, a cleaning liquid is introduced into the upstream end of the unit section, and the pump for pumping at the upstream end of the unit section is put into the operating state. After the introduced cleaning liquid is sent to the downstream side to clean the inside of the unit section,
By stopping the introduction of the cleaning liquid, supplying only pressurized air to the upstream end of the unit section, and putting the pump for pumping at the upstream end of the unit section into the operating state, the said in the unit section. The long-distance pumping method for a fluid material according to claim 5, wherein the cleaning liquid is sent to the downstream side to empty the unit interval. The long-distance route is a route in a long-distance space that is the target of at least one type of construction selected from shield construction, tunnel construction, and backfilling construction of underground cavities.
The fluid material is fluidized soil containing construction sludge and cement.
The long-distance pumping method for a fluid material according to any one of claims 1 to 6, wherein the fluidized soil is transported from the open end of the long-distance space to the inside to perform the underground work. In a long-distance pumping system that transfers fluid materials used for underground space construction over a long-distance route of 1000 m or more from a source .
It is equipped with an autonomous transfer system arranged for each unit section of the long-distance route divided into a plurality of unit sections.
The autonomous transfer system includes a pump for pumping located at the upstream end of the unit interval and a control device for controlling the operation of the pump for pumping.
Each of the autonomous transfer systems comprises a sensor by the control device that senses the arrival state of the fluid material that meets preset operating conditions at the upstream end of the unit interval.
The control device is configured to operate the pump for pumping at the upstream end of the unit interval to feed the fluid material downstream while the sensor senses the arrival state .
Long-distance pumping of a fluid material, characterized in that the autonomous transfer system of the plurality of unit intervals is sequentially activated to pump the fluid material from the source to the downstream end of the long-distance route. System . The control device controls the operation of the pump for pumping based on the detection result that the sensor has detected the arrival state .
The autonomous transfer system is characterized in that the pump for pumping is operated by the sensing result of the sensor, and the fluid material can be pumped from the upstream end to the downstream end of the unit interval. The long-distance pumping system according to claim 8 for a fluid material.

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