JP3423903B2 - Existing pipeline update system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing pipeline rehabilitation system, and more particularly to a gas supply system for a pipeline renewed by drawing a new pipe into the existing pipeline.

[0002]

2. Description of the Related Art Pipes such as gas pipes and water pipes buried in the ground may be corroded and deteriorated by laying for a long period of time or damaged by external force. Therefore, it is necessary to investigate the inside of the pipe and take repair measures by repair work. The remedial measures may be implemented not only for general consumers from the main branch through the inner service pipe, but also for pipelines to commercial consumers such as buildings and apartments. Conventionally, as a countermeasure for pipe rehabilitation, it is necessary to newly lay a resin pipe such as a polyethylene resin pipe having an outer diameter size close to the inner diameter of the existing pipe, or to draw the resin pipe into the existing pipe. There were methods of renewing the pipeline and methods of forming a resin lining film on the inner surface of the existing pipeline.

[0003]

However, in the above-mentioned conventional construction method, there is a possibility that excavation work is required, power and facility load required for pulling in become large, and cost increases due to increase in working time and man-hours. . Further, when the lining film is formed, there is a problem that the durability of the lining film is unstable.

In view of the above problems in the conventional existing pipeline renewal system, an object of the present invention is to ensure durability without increasing cost required for renewal work.
An object of the present invention is to provide an existing pipeline renewal system capable of maintaining the gas supply after renewal in a safe and stable state.

[0005]

In order to achieve this object, the invention according to claim 1 is a system for renewing an existing pipeline for supplying gas from near the main pipe through a shutoff valve. Inserted in the pipeline renewal section of the existing pipeline,
In the existing pipeline, a new pipeline having a diameter smaller than that of the existing pipeline, pressure increasing means for increasing the pressure of the gas in the new pipeline, means for adjusting the pressure of the pressurized gas to the pressure at the supply destination, A supply state monitoring means installed in the insertion section of the new pipeline, wherein the supply state monitoring means detects a change in gas concentration inside the update section in which the new pipeline is inserted. The shutoff valve is closed when the gas concentration inside the renewal section reaches a predetermined concentration or more, and an alarm can be issued.

According to a second aspect of the present invention, the supply state monitoring means includes a sensor capable of detecting leakage from the new pipeline by detecting the gas concentration in the existing pipeline, and the sensor is provided on the input side. The shut-off valve is connected to the output side, and the shut-off valve is provided with an operating section and a control section to which an alarm means is connected, and when the sensor detects that the gas concentration in the existing pipeline has increased. It is characterized in that it outputs a signal for shutting off the shutoff valve to the actuating part and gives an alarm.

The invention according to claim 3 is characterized in that the means for adjusting the pressure at the supply destination uses a regulator valve provided at each demand destination such as an apartment house or a building.

According to a fourth aspect of the invention, the new pipeline is
It is characterized in that it has a diameter so that it can be arranged with a gap with the inner surface of the existing pipeline.

[0009]

In the inventions described in claims 1, 3 and 4, since a new pipe having a small diameter capable of providing a gap with the inner surface of the existing pipe is inserted, the new pipe can be easily installed unlike press fitting. Pipelines can be laid. Moreover, boosting the pressure in the new pipeline prevents shortage of the supply amount, and further boosts pressure when an abnormal situation is detected such that the gas concentration in the existing pipeline increases due to leakage from the new pipeline. Since the supply of the generated gas can be automatically stopped, it is possible to prevent the leakage from expanding. As a result, it is possible to facilitate the renewal work of the new pipeline, correct the shortage of the supply amount in the new pipeline, and secure the safety measures when the shortage of the supply amount is corrected. .

According to the second aspect of the present invention, when the supply state monitoring means causes a leak from the new pipeline, the gas supply to the new pipeline can be stopped and an alarm can be issued.
It is possible to prevent the leakage accident from expanding in the new pipeline and to easily identify the pipeline in which the leakage accident occurred.

[0011]

The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 is a schematic diagram for explaining a pipeline configuration for commercial consumers targeting buildings and housing complexes. In the figure, the pipelines are from the main branch pipe 1 corresponding to a low-pressure pipeline to a building or the like. A service pipe 4 is provided for each customer through a shutoff valve 3 toward the building 2. The delivery pipe 4 that has reached each demand destination,
The regulator valve R regulates the working pressure to connect the gas equipment. The service pipe 4 corresponds to the existing pipeline in this embodiment, and a method of updating the existing pipeline is shown in FIG.

In FIG. 2, a new pipeline 5 is inserted in the renewal section within the service pipe 4 which is an existing pipeline communicating with the shutoff valve 3. The new pipe line 5 is made of a resin pipe such as polyethylene or nylon, and its diameter is smaller than the inner diameter of the service pipe 4 so that a gap can be formed between the service pipe 5 and the inner surface of the service pipe 4. There is. For this reason, the resistance of the newly installed pipeline 5 with respect to the service pipe 4 at the time of insertion, that is, the pull-in resistance is reduced. On the other hand, between the new pipeline 5 and the shutoff valve 3, a pressure increasing means 6 is arranged as shown in FIG. A compressor is used as the pressure increasing means 6, and the pressure is set so that the shortage of the supply amount due to the difference in diameter between the service pipe 4 and the new pipe line 5 can be compensated. The pipe to which the pressurized gas is supplied corresponds to the service pipe 4, but is provided behind the boosting means 6 at a branching portion to each customer (in FIG. 3,
It is also possible to provide a member indicated by reference numeral DV). The increased pressure in the new pipeline 5 is regulated by the regulator valve R provided at each customer.

A new pipeline 5 is attached to the service pipe 4 which is an existing pipeline.
Means 7 for monitoring the supply status in the renewal section by That is, in the supply state monitoring means 7, the gas leak detection sensor 7A arranged in the service pipe 4 is connected to the input side, and the open / close operation section 7B of the shutoff valve 3 and the alarm device 7C are connected to the output side. It is composed of a control unit. In FIG. 3, the gas leak detection sensor 7A is an opening 4A (see FIG. 4) formed at least at both ends of a laying section of a new pipeline 5 (indicated by a chain double-dashed line in FIG. 3) in the service pipe 4. It is composed of a gas concentration sensor which is inserted and positioned inside. As the opening / closing operation unit 7B of the shutoff valve 3, for example, a drive source provided for emergency shutoff on a valve shaft manually operated and a power supply unit for the drive source are used. As the alarm device 7C, not only a commonly known device capable of ringing or blinking is used, but in the present embodiment, a wireless communication device is equipped, and an identification code of an update section in which this alarm device is provided is used. It can be sent to the central monitoring center.

The supply state monitoring means 7 is adapted to monitor the gas leakage from the new pipeline 5 by inputting the concentration detection signal from the gas leakage detection sensor 7A. That is, when the gas leak detection sensor 7A detects an increase in concentration when a leak occurs from a state where there is no leak,
A signal for setting the shut-off valve 3 to the position for closing the shut-off valve 3 is output to the opening / closing operation unit 7B of the shut-off valve 3 and the alarm device 7C is activated. When the opening / closing operation portion 7B of the shutoff valve 3 is actuated, the shutoff valve 3 is closed, and when the alarm device 7C is actuated, data for identifying the updated section in which the gas leak is generated is transmitted to the central monitoring sensor. At the same time, in the update section, it is possible to confirm the update section in which a leak has occurred by ringing or blinking.

Since this embodiment has the above-mentioned configuration,
In the renewal section, the new pipeline 5 is installed in the service pipeline 4 which is the existing pipeline.
Is inserted. Since the new pipe line 5 has a difference in diameter with respect to the service pipe 4 and has a so-called gap, the resistance at the time of insertion is reduced, and the renewal work is facilitated as compared with the case of pulling in while press-fitting. It On the other hand, the new pipe line 5 laid in the renewal section is connected to the pressure increasing means 6 arranged continuously with the shutoff valve 3, and is connected to the regulator R on the demand side. The gas supply is started when the laying of the new pipeline 5 in the renewal section is completed, but the gas supplied from the main branch pipe 1 by the shutoff valve 3 is transferred to the new pipeline 5 and the domestic pipe 4 by the pressurizing means 6. Is set to a pressure that can correct the supply amount that decreases due to the difference in diameter. As a result, even when the new pipeline 5 having a diameter smaller than that of the existing pipeline is laid, the shortage of the supply amount to the demand destination is corrected.

A new pipeline 5 laid inside the service pipe 4.
The supply state monitoring means 7 monitors the supply state, particularly gas leakage. That is, when a gas leak is detected by a signal from the gas leak detection sensor 7A provided in the supply state monitoring means 7, the opening / closing operation part 7 of the shutoff valve 3 is detected.
A signal for closing the shutoff valve 3 is output to B.
As a result, the shutoff valve 3 is closed, and the gas supply to the new pipeline 5 is stopped. On the other hand, an operation signal is output from the supply state monitoring means 7 to the alarm device 7C so that the alarm device 7C can be operated to identify the renewal section in which the gas leakage has occurred. When the alarm device 7C is activated, it is possible to confirm the renewed section in which the gas leakage is occurring at the central monitoring center or by a maintenance inspector who receives a command from the central monitoring center, so that a prompt measure can be taken. Can be taken.

In the present embodiment, the supply state monitoring means 7 targets gas leakage in the new pipeline 5, but the invention is not limited to this.
By monitoring the gas pressure in the new pipeline 5,
In other words, it is also possible to carry out monitoring to obtain a supply amount of a predetermined amount. That is, a pressure sensor (not shown) may be arranged behind the boosting means 6 in the new pipeline 5, and the dynamic position of the boosting means 6 may be controlled according to the detection result from the pressure sensor.

[0018]

According to the invention described in claims 1, 3 and 4, since a new pipe having a small diameter capable of having a gap with the inner surface of the existing pipe is inserted, the pipe is pulled in while being press-fitted. Unlike the case, a new pipeline can be laid easily. Moreover, the supply pressure is prevented from being insufficient due to the pressure increase in the new pipeline, and an abnormal situation is detected in which the gas concentration in the existing pipeline changes due to leakage in the new pipeline. Then, the gas supply can be automatically stopped, so that the leakage can be prevented from expanding. This makes it easy to update the new pipeline and correct the supply shortage in the new pipeline.
Furthermore, it becomes possible to secure safety measures when the shortage of the supply amount is corrected.

According to the second aspect of the present invention, when the supply state monitoring means detects the occurrence of leakage from the new pipeline, the supply of gas to the new pipeline is stopped and an alarm can be issued. Therefore, it is possible to prevent the leakage accident from expanding in the new pipeline and to easily identify the pipeline in which the leakage accident has occurred. This makes it possible to promptly deal with a leakage accident in the new pipeline.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining an example of a pipeline in which an existing pipeline updating system according to an embodiment of the present invention is used.

FIG. 2 is a cross-sectional view for explaining a positional relationship between an existing pipeline and a new pipeline in the pipeline shown in FIG.

FIG. 3 is a schematic diagram for explaining the configuration of an update system according to an embodiment of the present invention.

4 is a block diagram for explaining a leakage monitoring structure used in the update system shown in FIG.

[Explanation of symbols] 1 Main pipe 2 Building such as building which is one of the demand destinations 3 Shut-off valve 4 Existing pipe which is an existing pipeline to be updated 5 New pipeline 6 Booster 7 Supply status monitor 7A Gas leak Detection sensor 7B Shutoff valve opening / closing operation section 7C Alarm device R Regulator valve for adjusting pressure at customer

Claims (4)

(57) [Claims] 1. A system for renewing an existing pipeline for supplying gas from the vicinity of the main pipe through a shutoff valve, the system being inserted into a pipeline renewal section of the existing pipeline, and from the existing pipeline. A small diameter new pipeline, pressure increasing means for increasing the gas pressure in the new pipeline, means for adjusting the pressure of the boosted gas to the pressure at the supply destination, and the new pipeline in the existing pipeline. A supply state monitoring means installed in the insertion section, wherein the supply state monitoring means detects a change in gas concentration in the update section in which the new pipeline is inserted, A system for updating an existing pipeline, wherein the shutoff valve is closed when the gas concentration reaches a predetermined concentration or more, and further an alarm can be issued. 2. The supply state monitoring means includes a sensor capable of detecting a leak from a new pipeline by detecting a gas concentration in the existing pipeline, and the sensor is connected to an input side and connected to an output side. Is provided with an operating part of the shutoff valve and a control part to which an alarm means is connected. When the sensor detects that the gas concentration in the existing pipeline has increased, the operating part of the shutoff valve is detected. The existing pipeline renewal system according to claim 1, wherein a signal for causing the shutoff valve to perform a shutoff operation is output and an alarm is issued. 3. The means for adjusting the pressure at the supply destination comprises:
The existing pipe renewal system according to claim 1, wherein a regulator valve provided at each demand destination such as an apartment house or a building is used. 4. The existing pipeline renewal system according to claim 1, wherein the new pipeline has a diameter that allows the new pipeline to be arranged with a gap from the inner surface of the existing pipeline.