JPH09145528A - Method for testing pressure of vacuum piping in vacuum waste water-collecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for testing a pressure of a vacuum pipeline in a vacuum- type waste water collection system whereby a pressure test of a required section of the vacuum pipeline can be sufficiently carried out on a short time. SOLUTION: A first plug 25 which is freely shrinkable and expandable is inserted in the compressed state into a vacuum pipeline 18 form a tube 24 with an inspection opening at the upstream side. Thereafter, the first plug 25 is changed into the expanded state to tightly shut the vacuum pipeline 18 at the upstream side. A shrinkable- expandable second plug 26 is inserted in the compressed state from a tube 24' with an inspection opening at the downstream side. Then, the plug 26 is turned in the expanded state to tightly shut the vacuum pipeline at the downstream side. At the same time, a third plug 27 is inserted in the compressed state and then expanded to tightly seal the inspection tube 24' at the downstream side. A pressure is applied to a section of the vacuum pipeline 18 tightly sealed by the first-third plugs 25-27 via a pressure test tube 271 inserted between the inspection tube 24' and the third plug 27 or directly inserted in the third plug 27. A pressure test is carried out in out in this manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure test method for a vacuum pipeline in a vacuum type waste water collecting system.

[0002]

2. Description of the Related Art Recently, in a vacuum type waste water collection system developed, a waste water tank with a vacuum valve is used as a waste water tank for collecting waste water discharged from many homes and facilities through a waste water pipe, and a vacuum pump. A vacuum station equipped with a water collection tank and a pressure pump is connected to a number of vacuum valves in a certain area by a vacuum pipeline, and the inside of this vacuum pipeline is constantly kept in a depressurized state, and the wastewater collects in the sewage basin and its water level. When the water level rises to the specified water level, the vacuum valve of the waste water basin is automatically opened by air compression in the water level detection pipe, the accumulated waste water in each waste water basin is sucked all at once and collected in the water collection tank of the vacuum station to collect water. When the water level in the tank rises to a predetermined level, the pressure pump is automatically driven to transfer the wastewater in the water collection tank to the sewage treatment plant or the main sewer of the public sewage.

Particularly severe airtightness is required at the pipe joint portion of the vacuum pipe line in this vacuum type waste water collecting system.
Therefore, it is necessary to perform a pressure test on the vacuum pipeline in the vacuum type waste water collection system.

Conventionally, as the pressure test method, the upstream and downstream section valves including the section to be pressure-tested in the vacuum pipeline are closed, and a pipe with an inspection port (branch portion) provided in the vacuum pipeline in the section is closed. In addition, for example, a method of mounting an airtightness test jig as described in Japanese Utility Model Laid-Open No. 6-69797 and reducing the pressure in a section to be pressure tested through the airtightness test jig can be considered.

[0005]

However, in the above-described pressure test method, it is necessary to reduce the pressure in the entire upstream and downstream section valves including the section to be pressure tested in the vacuum pipeline. However, if it takes a long time and the result of the test judgment is negative, there is a problem that it is inefficient because it is necessary to inspect all the bifurcations included in the section.

The present invention solves the above-mentioned conventional problems and enables a pressure test of a required section of a vacuum pipeline in a vacuum pipeline in a vacuum type waste water collecting system which can be efficiently performed in a short time. The purpose of the present invention is to provide a pressure test method.

[0007]

The invention described in claim 1 of the present application (referred to as the present invention 1) is to collect wastewater discharged from a large number of homes and facilities into a water collection tank by a vacuum pipe line having a negative pressure inside. A method for pressure test of vacuum piping in a collecting vacuum type waste water system, wherein a section valve is provided at an appropriate point in the vacuum pipeline, and a pipe with an inspection port is provided between the section valve and the section valve, Close the upstream and downstream section valves of the section of the two pipes with inspection ports that need to be subjected to a pressure test, and expand and contract the first plug into the vacuum pipeline from the pipe with inspection ports on the upstream side. After inserting the tube in a reduced diameter state, it is expanded to seal the inside of the vacuum tube on the upstream side, and from the tube with the inspection port on the downstream side,
The second plug, which can be expanded and contracted, is expanded in the expanded state after being inserted to seal the inside of the vacuum pipe line on the downstream side, and the third plug is expanded in the expanded state after being inserted. However, the inside of the pipe with the inspection port on the downstream side is sealed, and the first to the third plugs are inserted between the pipe with the inspection port and the third plug or through the ventilation pipe for the pressure test directly inserted into the third plug. It is a pressure test method for a vacuum pipeline in a vacuum type waste water collection system in which a pressure test is performed by applying a pressure to a section of the vacuum pipeline which is closed.

The invention according to claim 2 of the present application (hereinafter referred to as the present invention 2) is the vacuum type according to the present invention 1 in which the second plug and the third plug are connected by a connecting member. It is a pressure test method for a vacuum line in a wastewater collection system.

In the present invention 1, as the piping material of the vacuum pipeline, for example, metal such as stainless steel and iron, fiber reinforced resin, synthetic resin such as hard polyvinyl chloride and polyethylene,
Examples thereof include rubbers such as styrene-butadiene rubber, and synthetic resins such as hard polyvinyl chloride and polyethylene are particularly preferable, but the present invention is not limited thereto.

As the first to third plugs used in the first aspect of the present invention, expandable and contractable diameter plugs are used. For example, the plugs are made of a rubber material, and are inflated into a balloon shape by pressurizing air from a ventilation pipe. For example, the diameter can be increased by allowing the above to occur, and conversely the diameter can be decreased by removing air.

In the first aspect of the present invention, the vent pipe for the pressure test may be inserted between the inspection port pipe (branch portion) and the third plug, or may be directly inserted in the third plug. May be. In the first aspect of the present invention, examples of the pressure applied to the section of the vacuum pipe line sealed by the first to third plugs include vacuum pressure, air pressure, and water pressure.

In the present invention 2, as the connecting member, one that does not break or extend when a tensile force is applied is used, and examples thereof include a wire and a chain.

[0013]

According to the pressure test method of the vacuum pipeline in the vacuum type waste water collecting system of the present invention 1, a section valve is provided at an appropriate position in the vacuum pipeline, and a pipe with an inspection port is provided between the section valve and the section valve. The section valves on the upstream side and the downstream side of the section of the two pipes with inspection ports that need to be subjected to the pressure test are closed, and the pipes with the inspection ports on the upstream side can be expanded / contracted freely. After inserting the first plug in the diameter-reduced state, the diameter of the second plug is expanded to seal the inside of the vacuum tube on the upstream side, and the diameter of the second plug, which can be expanded and contracted, is reduced from the tube with the inspection port on the downstream side. In this state, the diameter of the pipe is expanded after insertion to seal the inside of the vacuum line on the downstream side, and the third plug is expanded in the state of shrinking the diameter of the third plug to close the inside of the pipe with the inspection port , For pressure test between the tube with inspection port and the third plug or directly inserted in the third plug By narrowing the range of the required section of the vacuum pipeline by performing a pressure test by applying a pressure to the section of the vacuum pipeline closed by the first to third plugs through the ventilation pipe. Therefore, the pressure test can be performed efficiently in a short time.

The pressure testing method of the vacuum pipeline in the vacuum type waste water collecting system of the second aspect of the present invention is further characterized by the fact that the second plug and the third plug are connected by a connecting member. When air pressure or water pressure is applied as the pressure applied to the section of the vacuum pipe line sealed by the third plug, the distance between the second plug and the third plug can be kept constant. Therefore, an efficient pressure test can be performed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An example of a pressure test method for a vacuum pipeline in a vacuum type waste water collecting system will be described with reference to FIGS. First, a piping structure of the vacuum type waste water collecting system of the present invention will be described with reference to FIGS. 1 and 2. FIG.
As shown in, sewage discharged from each household 11 or facility 12 such as a school or restaurant 13 such as a restaurant flows into a sewage basin 15 with a vacuum valve through a natural flow type sewer pipe 14,
When a certain amount of water is collected, the vacuum valve 17 installed in the upper part of the waste water tank 15 with a vacuum valve opens, and the waste water passes through a suction pipe (not shown) and a vacuum pump via a vacuum pipe line 18 arranged underground. It is drawn into the water collection tank 20 of the field 19.

Then, the sewage collected in the water collection tank 20 is sent to the sewage treatment plant by a pressure pump. A vacuum pump 21 is installed in the water collection tank 20 in order to keep the inside of the vacuum pipeline 18 and the water collection tank 20 at a negative pressure.

The vacuum pipeline 18 includes a main pipe 181, which is connected to the water collection tank 20, a number of branch pipes 182 branched from the main pipe 181, and a plurality of branch pipes 813 further branched from the branch pipe 182. And branch valves 182 and 183 are provided with a large number of section valves 23 at appropriate positions in the vicinity of the branch portions.

As shown in FIG. 2, a pipe with an inspection port (branch portion) 2 is provided between the section valve 23 and the section valve 21 of the vacuum pipeline 18.
4, 24 'are provided.

Next, an example of the pressure test method of the vacuum line in the vacuum type waste water collecting system will be described with reference to FIG. As shown in FIG. 3, in the section between the two section valves (not shown) to be subjected to the airtightness test of the vacuum line 18, an acute angle θ ₁ is formed with respect to the traveling direction P of the sewage flowing through the section valve. Thus, two pipes (branch parts) 24 and 24 'with inspection ports are provided.

First, as shown in FIG. 3 (a), the two section valves are closed, and a closed lid (not shown) of the inspection port 241 of one of the inspection port pipes (branch part) 24 is removed. From the inspection port 241, the first plug 25 with a ventilation pipe, which is inflatable into a balloon shape by press-fitting air, is inserted into the vacuum conduit 18, and the air is passed through the ventilation pipe in the first plug 25. The upstream side of the vacuum pipeline 18 is blocked by press-fitting and expanding it into a balloon shape.

Next, as shown in FIG. 3 (b), the closed lid of the inspection port 241 'of the other one of the inspection port-equipped tubes (branching parts) 24 is removed, and the inspection port (not shown) is removed. Then, the second plug 26 and the third plug 27 with a ventilation pipe, which are inflatable into a balloon shape by press-fitting air through the ventilation pipe, are inserted. As shown in FIG. 4, the ventilation pipe of the second plug 26 and the ventilation pipe 271 for the airtightness test are provided so as to pass through the third plug 27.

Then, as shown in FIG. 3 (c), air is pressed into the second plug 26 from the ventilation pipe to expand it into a balloon shape so as to shut off the downstream side of the vacuum pipeline 18, and Air is press-fitted into the plug 27 from the ventilation pipe to expand it into a balloon shape, and the inside of the other pipe (branch portion) 24 'with an inspection port is shut off.

After that, the first to third plugs 25 and 2
In a section surrounded by 6, 27, a vacuum (-0.8 kg) was made from a pressure tap (not shown) through a pressure test vent pipe 261.
/ Cm ² ), and a pressure test is performed based on a criterion (a vacuum reduction rate per hour of 1% (0.008 kg / cm ² / hr) or less).

[0024]

As described above, the pressure test method for the vacuum pipeline in the vacuum type waste water collecting system according to the first aspect of the present invention enables the pressure test to be performed efficiently in a short time.

Since the method for testing the pressure of the vacuum pipeline in the vacuum type waste water collecting system according to the second aspect of the present invention is as described above, the pressure is applied to the section of the vacuum pipeline closed by the first to third plugs. A more efficient pressure test can be performed when air pressure or water pressure is applied as the pressure.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an entire piping structure in a vacuum type waste water collection system according to the present invention.

FIG. 2 is a schematic diagram illustrating a main part of the piping structure shown in FIG.

3A and 3B are cross-sectional views illustrating a pressure test method of a vacuum pipeline in a vacuum type waste water collecting system, in which FIG. 3A is a cross-sectional view showing a state in which the upstream side of an inspection port 24 of the vacuum pipeline 18 is blocked; Is the inspection port 24 and the inspection port 24 'of the vacuum pipeline 18.
FIG. 4C is a cross-sectional view showing a state in which the inside of the pipe with an inspection port (branch portion) on the upstream side and the other side is shut off, and FIG.

FIG. 4 is a cross-sectional view illustrating a plug that seals a vacuum pipeline and a tube with an inspection port (branch portion) when performing a pressure test on the vacuum pipeline.

[Explanation of symbols]

 18 vacuum pipe 20 water collecting tank 24, 24 'section valve 25 first plug 26 second plug 27 third plug 28 connecting member 271 vent hole

Claims (2)

[Claims] 1. A pressure test method for vacuum piping in a vacuum type sewage system, in which sewage discharged from a large number of homes and facilities is collected in a water collection tank by a vacuum pipeline having a negative pressure inside, wherein the vacuum pipeline includes: A section valve is provided at an appropriate point, and a pipe with an inspection port is provided between the section valve and the section valve, and the upstream side and the downstream side of the section of the two pipes with the inspection port that need to be pressure tested. Side section valve is closed, and the first plug, which can be expanded and contracted, is inserted into the vacuum pipeline from the upstream inspection tube with the diameter reduced, and the expanded state is reached. The second plug, which is sealed and expanded and contracted from the inspection side pipe on the downstream side, is inserted into the expanded state after being inserted in the reduced diameter state to seal the inside of the vacuum line on the downstream side and the third plug. After inserting in the reduced diameter state, expand the diameter and seal the pipe with the inspection port on the downstream side. , Through the vent pipe for pressure test inserted directly between the inspection port tube and the third plug or through the third plug, the pressure is applied in the section of the vacuum pipeline closed by the first to third plugs. A method for testing the pressure of a vacuum pipeline in a vacuum type waste water collection system, which comprises performing a pressure test by loading. 2. The pressure test method for a vacuum pipeline in a vacuum type waste water collecting system according to claim 1, wherein the second plug and the third plug are connected by a connecting member.