JP2882921B2 - Fluid supply method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an increase in demand for fluid at a supply destination when an existing pipe or the like for supplying a fluid such as gas, clean water, or the like to a supply destination such as a home is provided. Therefore, the present invention relates to a fluid supply method for supplying a fluid, and more specifically, a second pipe is newly provided for a first pipe for supplying a fluid to a single or a plurality of supply destinations, and The present invention relates to a fluid supply method for supplying a fluid to at least a part of a specific supply destination.

[0001]

2. Description of the Related Art Conventionally, an increase in demand for fluid at a supply destination is generally handled by the following method.
That is, the first method is a method of increasing the fluid supply amount by increasing the fluid supply pressure by using the first pipe such as an existing pipe as it is, and the second method is suitable for the additional supply amount. This is a method of newly laying a second pipe capable of transporting only an amount of fluid, and supplying a fluid using the second pipe.

[0002]

However, if the first method is adopted in such a case, the following problem occurs. (A) Generally, a joint or the like is often used for the first pipe, and there is a risk that leakage may occur at the joint portion or an amount of leakage may increase due to an increase in fluid pressure. (B) In order to avoid the danger shown in (a), it is possible to attach a resin or tube to the inner surface of the first piping to prevent fluid leakage, but this would increase the cost and increase the cost. In this construction, it is necessary to stop supplying the fluid for a considerably long time.

On the other hand, when the second method is adopted, the following problem occurs. (B) When the second pipe is a buried pipe, especially in urban areas, there is little room for laying a new second pipe because water, gas, sewage, electricity, telegraph pipes and cables are complicated underground. . (B) In laying, it is necessary to carry out road excavation work, which may cause traffic obstruction.

Accordingly, it is an object of the present invention to reduce the space required for supplying an additional fluid without causing the above-mentioned problems.
An object of the present invention is to provide a fluid supply method capable of coping with an increase in a fluid supply amount in a state where it can be reduced as much as possible.

[0005]

A first characteristic means of the fluid supply method according to the present invention for achieving this object is to adopt a pipe having an ejection hole in a pipe wall as a second pipe, Is inserted into the first pipe, and the outlet is located at the first pipe corresponding to the specific supply destination, the supply pressure in the second pipe is set higher than the supply pressure of the first pipe, and the This is to eject a fluid from a hole toward a specific supply destination.

On the other hand, a second characteristic means in the fluid supply method according to the present invention employs a pipe having an ejection hole in a pipe wall as a second pipe, inserts the second pipe into the first pipe, and The outlet is arranged so as to be located at the first pipe portion corresponding to the specific supply destination, and the fluid pressure in the first pipe near the first pipe portion corresponding to the specific supply destination is detected as a secondary pressure, and the second pressure is detected. The primary supply pressure in the pipe is higher than the supply pressure of the first pipe, and the secondary pressure is controlled so as to be constant to supply the fluid. The characteristic means adopts a pipe having an ejection hole in a pipe wall as a second pipe, inserts the second pipe into the first pipe, and the first pipe in which the ejection hole corresponds to the specific supply destination. Arrange so that it comes to the site,
Further, detecting the fluid demand related information of the specific supply destination, supplying the fluid by controlling the flow rate supplied from the second pipe to correspond to the fluid demand amount of the specific supply destination, -The effects are as follows.

[0007]

In other words, in the fluid supply method of the present invention, first,
In the second and third characteristic means, both the specific supply destination is supplied with fluid from the first pipe and the second pipe is supplied with fluid via the ejection hole. Then, the total of these supply amounts is supplied to the specific supply destination.

Here, in the first characteristic means, for example, with the increase in the fluid demand of the specific supply destination, the fluid ejected from the ejection holes is replenished and sent to the specific supply destination.

Further, when the second characteristic means is adopted, the fluid pressure in the vicinity of the ejection hole in the first pipe is kept constant by controlling the primary supply pressure in the second pipe (leakage occurs in the first pipe). In practice, the flow in the first pipe is not greatly affected by the fluid supplied by the second pipe. That is,
This flow changes from the conventional flow state due to the interpolation of the second pipe and the pressure state of the secondary pressure detection unit, but it is stabilized in a new state and is maintained in this new fluid supply state. It becomes. Here, a flow rate that is sufficient for the demand of the specific supply destination (a quantity that is insufficient only with the fluid supply by the first pipe) is supplied from the second pipe as in the case of the first characteristic means. In the present application, in both the first and second characteristic means, since the supply pressure in the second pipe is maintained at a higher pressure than that in the first pipe, the supply amount by the second pipe is significantly increased. Becomes possible.

In the second characteristic means, the primary supply pressure is controlled by controlling the fluid pressure in the vicinity of the ejection hole in the first pipe. The fluid supply state (finally the supply flow rate) in the two pipes can also be controlled. (Here, it is not always necessary to detect the fluid demand itself, but it is sufficient to detect related information that can be estimated or the like (this is referred to as fluid demand related information).) This is the configuration of the third characteristic means of the present application and Action. In this case, as in the case of the second characteristic means,
If the supply amount from the outlet of the second pipe and the demand amount of the specific supply destination are balanced, the pressure in the first pipe does not increase or decrease. On the other hand, the supply amount from the ejection holes can be arbitrarily controlled by controlling the primary supply pressure and the like. Therefore, if the fluid demand related information of the specific supply destination is detected and the supply flow rate from the second pipe is controlled according to the information, the additional supply to the specific supply destination can be performed without the influence of the pressure fluctuation of the first pipe.

[0011]

Therefore, the following effects can be obtained by employing the fluid supply method of the present invention. (A) In order to insert the second pipe inside the first pipe, only the work of inserting the second pipe into the first pipe and the take-out part (excavation work for buried pipes) is sufficient. For the part where the pipe is inserted, it is unnecessary to secure a new required space (in the case of a buried pipe, the site). (B) Because at most two works are required for (a), no major traffic obstacles will occur. (C) Since the first pipe is not directly pressurized, the first pipe can be used as usual, and there is no need to worry about the occurrence of leakage or an increase in the amount of leakage from the joint of the first pipe.

(D) Further, new measures such as lining for preventing leakage of the first pipe are unnecessary. (E) The size of the second pipe is determined considering the specific supply destination and the trend of demand during supply in the first pipe, but since this second pipe is configured to be inserted into the first pipe, In determining the wall thickness, for example, in the case of a buried pipe, it is not necessary to consider the earth pressure, wheel load, and corrosion allowance.If it is determined only by considering the pressure of the fluid supplied in this pipe, the tractive force at the time of insertion, and the pushing force, Good, it becomes possible to make it thinner than before.

[0013]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example in which the fluid supply method according to the present invention is applied to a new supply destination that requires additional supply of fluid, or to an existing supply destination but a supply destination that requires additional supply of fluid. It is shown. Such a supply destination is called a specific supply destination, and a case where this is the home 1 will be described.

That is, in such a conventional case, an additional branch pipe 3 is laid on the existing pipe 2 as the first pipe and supplied to a new home 1, or the existing pipe 2 is supplied to the home 1 as a supply destination.
Via the existing branch pipe 4 connected to the low pressure state (1
Gas g as a fluid in 00~230mmH about ₂ O)
Was supplied. Now, it is assumed that the demand for gas g in the home 1 has increased, and a situation has arisen in which it is not possible to supply a sufficient amount of gas only by supplying the existing pipe 2. In such a case, in the method of the present application, the new pipe insertion portion 2a is provided in the existing pipe 2, and the new pipe 20 as the second pipe is inserted. A jet hole 5 is provided in the pipe wall of the new pipe 20.
Alternatively, it is disposed at a position corresponding to the existing branch pipe 4.

The fluid in the new pipe 20 is supplied from the jet holes 5 into the existing pipe 2 and further supplied to the target home 1 via the additional branch pipe 3 or the existing branch pipe 4. The additional gas g is supplied.
Further, a control device 6 for controlling the supply pressure of the new pipe 20 as a primary supply pressure is provided on the supply side of the new pipe 20. The control device 6 is provided with a detector 7 for detecting the fluid pressure in the existing pipe near the ejection hole 5 described above, and information detected by the detector 7 is transmitted to the controller 6 described above. Is used as the secondary pressure to control the primary supply pressure. Here, the secondary pressure is set to a constant value equal to or less than a value at which no leakage or the like occurs in the existing pipe 2.

In this embodiment, a configuration is adopted in which the above-described detector 7 is inserted from the same new pipe insertion portion 2a simultaneously with the insertion of the new pipe 20. The supply pressure of the gas g in the new pipe 20 is about 1 to 3 kg / cm ² , and a pressure higher than the fluid pressure in the existing pipe 2 is selected.

In the following, when such a supply method is adopted, the condition of the existing pipe 2 when the additional branch pipe 3 is provided, the pipe diameter of the new pipe 20, and the supply fluid when the new pipe 20 is laid. Explain the rate of increase of the amount. Example 1-1: existing pipe: Size -100A (inner diameter 100 mm) prolongation -100M, supplied without the downstream pressure -230mmH ₂ O supply amount -250m ³ / hr: For (existing branch pipe 3 places) in the case new tube providing additional branch pipes of 100m to: tubes species - steel prolongation -100m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G existing pipe allowable pressure condition (a) In the case of 250 mmH ₂ O Size -30 A (inner diameter 34 mm) The rate of increase in the supply amount to the additional branch pipe 2.5 times the flow rate (270 m ³ / hr) when the pressure of the existing pipe is increased (b) In the case of 300 mm H ₂ O Size -30A (inner diameter 34mm)-50A (inner diameter 48m)
m) The rate of increase of the supply amount to the additional branch pipe 1.9 times the flow rate (440 m ³ / hr) of the existing pipe when the pressure is increased.

Example 1-2: Existing pipe: size -200A (inner diameter 200mm) Length -200m, no supply to downstream side Pressure -230mmH ₂ O Supply amount -1000m ³ / hr (existing branch pipe: 3 places If new tube provided additional branch pipe 200m away in the case of): tube type - steel prolongation -200m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G jetting holes - size: respect 1.0mm existing pipe allowable pressure (b) 250mmH ₂ O when the size -75A flow rate by the time of boosting the (inner diameter 72 mm) existing pipe (1000m ³ / hr), increasing rate maximum supply amount for additional branch pipe 1.5
Double (b) In case of 300 mm H ₂ O Size -75A (inner diameter 72mm)-100A (inner diameter 92mm)
mm) The maximum increase rate of the supply amount to the additional branch pipe is 1.8 with respect to the flow rate (1800 m ³ / hr) of the existing pipe when the pressure is increased
Double

Example 1-3: Existing pipe: size -400A (internal diameter 400mm) Length -500m, no supply to downstream side Pressure -230mmH ₂ O Supply amount -3600m ³ / hr (existing branch pipe: 3 places If new tube provided 500m pointers to additional branch pipes in the case of): tube type - steel prolongation -500m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G jetting holes - size 1 against .0mm existing pipe allowable pressure condition (b) 250mmH ₂ O when the size -150A flow rate by the time of boosting the (inner diameter 133 mm) existing pipe (3900m ³ / hr), increasing rate maximum supply amount for additional branch pipe 1.8
Double (b) In case of 300 mm H ₂ O Size -150 A (inner diameter 133 mm)-200 A (inner diameter 174 mm) Increase rate of supply amount to additional branch pipe with respect to flow rate (6300 m ³ / hr) at the time of pressure increase of existing pipe 2 .1
Double

In the above-described embodiment, the case where the new pipe 20 is a straight pipe such as a steel pipe has been described. However, it is also possible to use a flexible pipe such as a polyethylene pipe. An example of such a case is shown below. When such a pipe is used, it can be applied to a case where the existing pipe 2 has a bent portion 10 as shown in FIG.

An example of such a pipe is shown in the same configuration as above. Example 1-4: existing pipe: Size -100A (inner diameter 100 mm) prolongation -100M / pressure -230mmH ₂ O supply rate - inlet side: 250 meters ³ / hr (the existing branch pipe: 3 places) exit side: 100 m ³ / If new pipe in the case of hr providing additional branch pipe to 100m on: the tube type - polyethylene pipe prolongation -100m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G jetting holes - size: If the allowable pressure condition (b) 250mmH ₂ O of 1.0mm existing pipe size -25A (inner diameter 27mm) ~30A (inner diameter 34m
m) flow rate by the voltage step-up of the existing pipe (250m ³ / hr) relative to the increase rate up to 1.9 times the supply amount for additional branch pipe (b) 300mmH ₂ O when the size -30A (internal diameter 34 mm) -50A (48m inside diameter)
m) Up to 2.8 times the increase rate of the supply amount to the additional branch pipes, compared to the flow rate (420 m ³ / hr) of the existing pipes when the pressure is increased

[0022] Example 1-5: existing pipe: Size -200A (inner diameter 200 mm) prolongation -100M, bend 2 places pressure -230MmH ₂ O supply amount - branch 870m ³ / hr (the existing branch pipe: 3 places ) When an additional branch pipe is provided 100 m ahead in the case of 400 m ³ / hr on the downstream side New pipe: Pipe type-polyethylene pipe Extension-100 m Pressure-inlet side: 3 kg / cm ² G Outlet side: 1 kg / cm ² G jetting holes - size: relative 1.0mm existing pipe allowable pressure condition (b) 250mmH ₂ O when the size -75A flow rate by the time of boosting the (inner diameter 72 mm) existing pipe (1500m ³ / hr), additional branch pipes Increase rate of supply to 2.2
Double (b) Allowable pressure of existing pipe: 300 mmH ₂ O Size -75 A (inner diameter 72 mm) to 100 A (inner diameter 92
against mm) flow rate by the voltage step-up of the existing pipe (2400m ³ / hr), increasing rate maximum supply amount for the additional branch pipe 2.5
Double

[0023] Examples 1-6: existing pipe: Size -500A (inner diameter 500 mm) prolongation -500M, bend 5 places pressure -230mmH ₂ O supply amount - the existing branch pipe 1400 m ³ / hr (the existing branch pipe:
(3 places) In the case of 1500m ³ / hr downstream, if an additional branch pipe is provided 100m ahead, new pipe: Pipe type-Polyethylene pipe Extension -500m Pressure -Inlet: 3kg / cm ² G Outlet: 1kg / Cm ² G ejection hole-size: 1.0 mm Allowable pressure condition of existing pipe (a) In case of 250 mm H ₂ O Size-150 A (inner diameter 133 mm) For maximum supply flow rate of existing pipe (3600 m ³ / hr), Increase rate of supply amount to additional branch pipes 1.9 times at maximum (b) Allowable pressure of existing pipes: 300 mmH ₂ O Size-150 A (inner diameter 133 mm) to 200 A (inner diameter 174 mm) Maximum supply flow rate of existing pipes (6000 m) ³ / hr), the rate of increase in supply to the additional branch pipes is up to 2.2 times

In the above embodiment, an additional branch pipe 3 is newly provided at a specific portion of the existing pipe 2 to cope with an increase in demand at a specific supply destination. However, as shown in FIG. The same applies to the case where there are a plurality of branch pipes 4. Hereinafter, these embodiments will be described with the same configuration as above.

2 Improvement of supply capacity to existing branch pipes Example 2-1 Existing pipes: Size: -100 A (inner diameter: 100 mm) Length: -100 m, no supply to downstream side Pressure: 230 mm H ₂ O Supply amount: 250 m ³ / hr: If new tubes (the existing branch pipe 3 places): tube type - steel prolongation -75m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G jetting holes - size: 1.0 mm allowable pressure condition (b) 250mmH ₂ O when the size -20A balloon existing pipe to each bifurcation (inner diameter 21mm) ~30A (inner diameter 34m
m) For each existing branch pipe, the flow rate (33
0 m ³ / hr), the maximum increase rate of the supply amount is 2.4
Double (b) Allowable pressure of existing pipe: 300mmH ₂ O Size -20A (inner diameter 21mm) to 50A (inner diameter 48m)
m) For each existing branch pipe, the flow rate (46
0 m ³ / hr), the maximum increase rate of the supply amount is 4.2
Double

Example 2-2 Existing pipe: size -200A (inner diameter 200mm) Length -200m, no supply to downstream side Pressure -230mm H ₂ O Supply rate -1000m ³ / hr (existing branch pipe: 3 places) If new tubes: tubes species - steel prolongation -150m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G jetting holes - size: 1.0 mm tolerance of the existing pipe balloon to each bifurcation pressure conditions (i) 250mmH ₂ O where size -50 a (inner diameter 48mm) ~75A (inner diameter 72m
m) The flow rate (10
30 m ³ / hr), the maximum rate of increase in the supply amount
8 times (b) Allowable pressure of existing pipe: 300 mmH ₂ O Size -75 A (inner diameter 72 mm) to 100 A (inner diameter 92
mm) For each existing branch pipe, the flow rate of the existing pipe during pressurization (19
00m ³ / hr), the maximum rate of increase in the supply amount is 3.
7 times

Example 2-3 Existing pipe: size -400A (internal diameter 400mm) Length -500m, no supply to downstream side Pressure -230mm H ₂ O Supply rate -3600m ³ / hr (existing branch pipe: 3 places) If new tubes: tubes species - steel prolongation -375m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G jetting holes - size 1.0mm allowable pressure of the existing pipe balloon to the branch pipes Conditions (A) In the case of 250 mmH ₂ O Size-150 A (133 mm inner diameter) Flow rate at the time of increasing the pressure of the existing pipe to each existing branch pipe (47
00m ³ / hr), the maximum rate of increase in the supply amount
3 times (b) Permissible pressure of existing pipe: 300 mmH ₂ O Size-150 A (inner diameter 133 mm)-200 A (inner diameter 174 mm) Flow rate at the time of pressurizing the existing pipe to each existing branch pipe (66
00m ³ / hr), the maximum rate of increase in the supply amount is 3.
2 times

In such a case, it is also possible to adopt a flexible tube as the new tube 20 as described above. An example of such a pipe is shown with a configuration similar to the above. Example 2-4 existing pipe: Size -100A (inner diameter 100 mm) prolongation -100m pressure -230mmH ₂ O supply amount - branch 110m ³ / hr (the existing branch pipe: 3 places) when the downstream 100 m ³ / hr new pipe: pipe species - polyethylene pipe prolongation -75m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G jetting holes - size: 1.0 mm allowable pressure of the existing pipe balloon to each bifurcation Conditions (A) In the case of 250 mmH ₂ O Size -20A (inner diameter 21mm) to 30A (inner diameter 34m)
m) For each existing branch pipe, the flow rate (18
0 m ³ / hr), the maximum increase rate of the supply amount is 4.2
Double (b) Allowable pressure of existing pipe: 300 mmH ₂ O Size -25 A (inner diameter 27 mm) to 50 A (inner diameter 48 m)
m) For each existing branch pipe, the flow rate (32
0 m ³ / hr), the maximum increase rate of the supply amount is 5.9
Double

Example 2-5 Existing pipe: Size -200A (inner diameter 200mm) Length -200m, 2 bends Pressure -230mmH ₂ O supply -branch pipe 420m ³ / hr (branch pipe: 3 places) Downstream If the side 400 meters ³ / hr new pipe: pipe species - polyethylene pipe prolongation -150m pressure - inlet side: 3 kg / cm ² G exit side: 1 kg / cm ² G jetting holes - size: 1.0 mm each bifurcation If balloon allowable pressure condition (b) 250mmH ₂ O of the existing pipe size -40A (inner diameter 39mm) ~75A (inner diameter 72m
m) For each existing branch pipe, the flow rate (74
0 m ³ / hr), the maximum increase rate of the supply amount is 4.0
Double (b) Allowable pressure of existing pipe: 300 mmH ₂ O Size -50A (inner diameter 43mm) to 100A (inner diameter 92)
mm) For each existing branch pipe, the flow rate (13
00m ³ / hr), the maximum rate of increase in the supply amount.
2 times

[0030] Example 2-6 existing pipe: Size -500A (inner diameter 500 mm) prolongation -500M, bend 5 places pressure -230mmH ₂ O supply amount - branch 1400 m ³ / hr (the existing branch pipe: 3 places) When an additional branch pipe is provided 100 m ahead at 1500 m ³ / hr on the downstream side New pipe: Pipe type-polyethylene pipe Extension -375 m Pressure-inlet side: 3 kg / cm ² G Outlet side: 1 kg / cm ² G Blow hole-Size: 1.0 mm Blows out to each branch part Allowable pressure condition of existing pipe (A) In case of 250 mm H ₂ O Size -100A (92 mm inner diameter) to 150A (1 inner diameter)
33mm) The flow rate (2
Respect 500m ³ / hr), increasing rate up to 4.3 times the supply amount (B) of the existing pipe allowable pressure: For 300mmH ₂ O size -150A (inner diameter 133 mm) ～200A (inner diameter 174 mm) the additional branch pipe Due to the pressure increase of the existing pipe (4
500 m ³ / hr), the maximum increase rate of the supply amount is 4.7 times

(Relationship between Size of Existing Pipe and Size of New Pipe) In practicing the present invention, the size of the existing pipe 2 is set in accordance with conditions such as the size, extension, downstream conditions, and allowable pressure.
The pipes and supply conditions that satisfy 0 should be calculated and determined individually, but generally, the size of the new pipe 20 should be about 1/5 to 1/2 that of the existing pipe 2. Becomes If the size is smaller than this, improvement in supply capacity cannot be expected even if the existing and new pipes 2 and 20 are combined.
On the other hand, if it is larger than this size, in order to maintain the initial supply amount of the existing pipe 2, the supply pressure in the existing pipe 2 needs to be equal to or higher than the allowable pressure, and leakage from the joint and an increase in the leakage amount And other problems.

In the embodiment described above, it is necessary to control the pressure in the vicinity of the ejection hole 5 of the second pipe 20 more precisely in order to control the control device 6 accurately.
In this case, it is necessary to detect the pressure in the first pipe 2 in the vicinity of the ejection hole 5 of the second pipe 20, and for that purpose, as shown in FIG. 1 or FIG. 7 need to be inserted together with the second pipe 20 or a hole for pressure detection must be made in the wall of the first pipe 2 for detection. Here, in particular,
Assuming that the first pipe 2 is provided with the detection hole 2b, when the first pipe 2 is a buried pipe, excavation work is required, and
When the detector 7 is inserted, it is necessary to take measures such as explosion proof.

Therefore, as a method of making such an operation unnecessary, instead of operating the control device 6 by the pressure in the first pipe 2 in the above embodiment, the fluid demand related information at the specific supply destination 1 (here, this Demand detection is based on flow rate
This is performed from the information related to flow rate such as pressure. ) May be used to operate the control device 6. The configuration of this example is shown in FIG.
FIG. 5 is a block diagram of a control system in this example.
This is shown in FIG. Here, the first block diagram shown in FIG. 5 shows the case of the flow rate control by the flow rate (one of the fluid demand related information), and that of FIG. 6 shows the case of the flow rate control by the pressure (one of the fluid demand related information). . The configuration of this example will be described with reference to FIG. As in the above-described example, the second pipe 20 is inserted into the first pipe 2, and the additional gas g is supplied from the second pipe 20. Now, in the case of this example, the specific supply destination 1 is provided with a flow rate detection system 1q. Then, the detection result by the flow rate detection system 1q is
(Specifically, a flow controller, etc.). The control device 6 operates based on this data. Here, the flow rate or the inlet (outlet of the control device 6) pressure of the second pipe 20 is naturally controlled to an amount corresponding to the demand of the specific supply destination 1.

The configuration of the control system will be described with reference to FIGS. 5 and 6. This control system receives a flow rate signal from the specified supply destination 1 and receives a flow signal from the specific supply destination 1 to control the downstream side of the control valve 20a provided in the second pipe 20. This is a control system that outputs the flow rate. This system is a feedback control system.
0a, deviation amplifier 20b, hunting prevention circuit 2
0c, a servo motor drive circuit 20d, and the like. Now, in the control system shown in the first block diagram, the flow-related information from the specific supply destination 1 undergoes signal conversion to become input-side flow rate information S1, which is provided downstream of S1 and the control valve 20a. Output side flow rate information S2 obtained by converting a pressure difference generated by the orifice 20e into a flow rate.
The feedback control is performed based on the information.
On the other hand, in the control system shown in the second block diagram, the information related to the flow rate from the specific supply destination 1 is the information related to the second pipe (the pipe diameter of the second pipe,
The required supply flow rate of the second pipe 20 is used as input side pressure information S3 based on the length of the pipe, and the information S3 and the pressure information on the control valve outflow side detected downstream of the control valve 20a are signal-converted. Output pressure information S4
Then, feedback control is performed. In this control state, the supply state of the fluid is the same as in the above example. In this example, since the flow rate and the pressure of the second pipe 20 can be controlled without relation to the information on the pressure of the first pipe 2, the operation of inserting the second pipe 20 into the first pipe 2 is specified. Only by providing a transmission facility (not shown) for the flow rate-related information of the supply destination 1 and a control system for the second pipe 20, additional gas can be supplied. Further, since it is not necessary to detect the pressure of the first pipe 2 of the specific supply destination 1, it is not necessary to pierce the first pipe 2 and insert the detecting tool 7.

[Another embodiment] Another embodiment will be described below. (A) In the above embodiment, the example of the gas g is shown as the one supplied by the pipe, but this may be any gas that can be transported by the pipe. These are collectively called fluids. (B) In the above-described embodiment, the case where the first pipe is an existing pipe and the second pipe is a new pipe has been described. However, the first pipe carries a plurality of supply destinations, and the second pipe has If only part of the fluid demand is significantly different, the first and second pipes may be newly provided and the method of the present invention may be adopted. In this case, the influence of the specific supply destination on other supply destinations can be avoided, and the space required for fluid supply can be reduced. (C) In addition to the above-described polyethylene tube, a bellows tube or the like can be used as the flexible tube. (D) As shown in FIG. 7, the second pipe may be of a first-stop type in which the downstream side is closed. (E) When a plurality of branch pipes are arranged in close proximity to each other, a full-surface jet having a plurality of jet holes 5 on the entire surface of a predetermined portion of the second pipe as a second pipe as shown in FIG. It is also possible to use tubes. (F) Further, as a method of detecting the secondary pressure, not only the structure attached to the second pipe as shown in FIG. 1 but also the specific branch pipe of the present invention in the first pipe as shown in FIG. It is also possible to provide a detection hole or the like in the vicinity and detect this.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state of a second pipe inserted into a first pipe.

FIG. 2 is a view of an embodiment in which a first pipe has a bent portion.

FIG. 3 is a diagram of an embodiment in which a first pipe has a plurality of branch pipes.

FIG. 4 is a diagram of an embodiment in which control is performed by detecting a flow rate at a specific supply destination.

FIG. 5 is a block diagram of a control configuration based on a flow rate in the embodiment of FIG. 4;

FIG. 6 is a block diagram of a control configuration by pressure in the embodiment of FIG. 4;

FIG. 7 is a diagram of an embodiment in which a newly installed pipe is of a tip-stop type.

FIG. 8 is a diagram of an embodiment in which the second pipe is a full-surface type ejection pipe.

FIG. 9 is a diagram of an embodiment of another configuration for detecting a secondary pressure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Specific supply destination 2 First pipe 5 Outlet 20 Second pipe

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F17D 1/00-5/08 E03B 7/00

Claims (4)

(57) [Claims] 1. A first pipe (2) for supplying a fluid to one or a plurality of supply destinations, and a second pipe (20) is newly added.
A fluid supply method for supplying a fluid to a specific supply destination (1), which is at least a part of the supply destinations, wherein the second pipe (20) has a discharge hole (5) in a pipe wall portion. A pipe is used, and the second pipe (20) is inserted into the first pipe (2) so that the ejection hole (5) comes to the first pipe section corresponding to the specific supply destination (1). And the supply pressure in the second pipe (20) is set higher than the supply pressure in the first pipe (2), and the fluid is directed from the ejection hole (5) toward the specific supply destination (1). A fluid supply method that ejects. 2. A second pipe (20) for a first pipe (2) for supplying a fluid to one or a plurality of destinations.
A fluid supply method for supplying a fluid to a specific supply destination (1) which is at least a part of the supply destination by laying a pipe, wherein the second pipe (20) has an ejection hole (5) in a pipe wall portion.
And the second pipe (20) is inserted into the first pipe (2), and the ejection hole (5) is provided at a first pipe portion corresponding to the specific supply destination (1). And the fluid pressure in the first pipe near the first pipe section corresponding to the specific supply destination (1) is detected as a secondary pressure, and the primary supply in the second pipe (20) is detected. A fluid supply method for supplying the fluid by controlling the pressure to be higher than the supply pressure of the first pipe (2) and to keep the secondary pressure constant. 3. A new pipe (20) for a first pipe (2) for supplying a fluid to a single or a plurality of destinations.
A fluid distribution method for distributing a fluid to a specific supply destination (1) which is at least a part of the supply destinations, wherein the second pipe (20) has an ejection hole (5) in a pipe wall portion. A pipe is used, and the second pipe (20) is inserted into the first pipe (2) so that the ejection hole (5) comes to the first pipe section corresponding to the specific supply destination (1). And further detects fluid demand related information of the specific supply destination (1), and controls the flow rate supplied from the second pipe (20) to correspond to the fluid demand at the specific supply destination (1). And a fluid supply method for supplying the fluid. 4. The fluid supply method according to claim 1, wherein said second pipe is a flexible pipe.