JPH0842797A - Inspection method for piping, and plug type pressure gauge used for the method - Google Patents

Abstract

PURPOSE:To obtain an inspection method for piping with which water leakage is prevented at the completion time of piping. CONSTITUTION:Plugs 1 are arranged on water pipings in a building during construction. Water is sealed therein while being pressurized. A pressure gauge 5 is arranged on the piping in which water is sealed. The pressure gauge 5 is arranged until the piping work is completed when the piping is connected to a main pipe. l When the piping is damaged in the mean time, the water stored with pressure therein leaks and the pressure in the piping is reduced. It is possible to prevent water leakage at the time of piping work by sensing the pressure reduction from the pressure gauge 5 when the piping is completed, and by inspecting damage of the piping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting water supply, hot water supply, gas piping, etc. in a building, which is carried out during construction, and a plug type pressure gauge used in the inspection method.

[0002]

2. Description of the Related Art When a pipe for supplying water, hot water, or a fluid such as a gas pipe is installed in a building under construction, an inspection at the time of construction is conducted in order to prevent a leakage accident due to a piping mistake. For example, in the case of water pipes, the pipes are inserted or penetrated through the walls of the building or under the floor, etc., and the pipes are piped to specified locations, so it is necessary to prevent damage to the finished surface due to piping work. Piping is done at the stage where the framework such as the floor is completed, and at the same time, the piping is inspected.

That is, as shown in FIG. 7, when a large amount of piping is used in a bathroom, kitchen, or each floor, an airtight test is performed every time the piping is finished. In this airtightness test, a plug 1 is placed on the inside of the pipe, the pipe is filled with water from the outside, and then a test pump 4 including a water tank 2 and a pressurizing pump 3 for pumping the water in the water tank 2 shown in FIG. 8 is used. A predetermined pressure is applied to the pipe by connecting and pressurizing water into the pipe having the stopper 1, and at this time, it is inspected by the pressure gauge 5 provided in the test pump 4 whether or not the pressure is reduced. . At this time, the pipes that failed the inspection are redone until they pass the inspection, and the pipes that passed the inspection are fitted with water taps by the time the building is completed, and external pipes are used to supply water. Connect with tube 6.

By the way, in the above-mentioned piping method, since the piping is carried out during the construction work, the piping after the inspection is left for a long time while the remaining construction is carried out,
There is a problem that water is rarely leaked when it is damaged by construction work after piping (for example, nails that are struck during construction work or impact applied) and water is passed when the construction is completed.

As one method for solving this problem,
The air tightness test should be performed before passing water, but it is more likely that the pipe will leak due to a connection mistake during piping than if the pipe leaks due to damage during the period of standing. Moreover, if the piping is redone after finishing, the finished surface is often damaged, so there is a problem in performing an airtight test only before passing water. Therefore, the airtightness test should be performed twice, during piping and immediately before passing water.

[0006]

However, if the airtightness test is performed twice as described above, the pipe must be filled with water and the test pump must be connected and the airtightness test must be performed by pressurizing each time. Since it does not occur, there is a problem that it is complicated, laborious and inefficient.

Therefore, an object of the present invention is to provide a pipe inspection method which can efficiently perform a complicated airtight test, and a pressure gauge used for the inspection.

[0008]

In order to solve the above-mentioned problems, in the first invention, when piping for water supply, hot water supply, gas, etc. is carried out during construction, a fluid is pressurized and sealed in the piping. By installing a pressure gauge on the pipe containing the fluid, and by installing the pressure gauge until the pipe is connected to the main pipe, check the pressure gauge during that time to check if there is any damage to the pipe. The inspection method of inspecting is adopted.

According to the second aspect of the invention, a housing having a joint for fitting the pressure gauge to the end of the pipe and having a through hole communicating with the end face of the joint and a spring through the through hole are provided. And a pipe-shaped pressure indicating member having a scale graduated on the surface of the member, the pressure indicating member has an O-ring fitted at the tip on the joint side and an inlet formed at the rear end. A protrusion is provided that abuts one end of a spring inserted between the O-ring and the injection port, and a check valve that allows fluid to pass through the inside of the display member pipe toward the joint portion is provided. Is provided with a stopper that comes into contact with the other end of the spring.

Further, in the third invention, one end communicates with the through hole formed in the end face of the joint and the other end is poured into the housing having the joint for fitting the pressure gauge with the end of the pipe. A pressure injection pipe having an inlet, a check valve for allowing fluid to pass through the pressure injection pipe only in the direction of the joint, and a hollow flat plate having one end communicating with the through hole of the joint and the other end sealed. The structure is provided with a pressure receiving body in which the pipe is formed in a coil shape, and a pressure indicating pointer attached to the other end of the pressure receiving body.

[0011]

In the pipe inspection method according to the first aspect of the present invention constructed as above, when the pipe is constructed during construction, the pipe is plugged and a fluid such as water or air is applied with pressure. By enclosing and installing a pressure gauge on the enclosed pipe, if there is a leak in the pipe, the pressure in the pipe will decrease due to the leak, so read the decrease in pressure from the pressure gauge and perform the piping work. You can inspect for leaks due to mistakes.

After the inspection, the pipe is plugged, and the pressure gauge is attached with the fluid sealed until the pipe is connected to the main pipe. Can be inspected.

On the other hand, in the pressure gauge according to the second aspect of the present invention, since the joint portion fits the end portion of the pipe, the housing can be directly attached to the pipe. At this time, the pressure indicating member inserted into the through hole of the housing is sealed between the pressure indicating member and the through hole by the O-ring fitted at the tip of the joint side, and the check valve in the pipe prevents the pressure in the pipe from being increased. The pressure gauge can seal the tubing because it can prevent the outflow of fluid from the.

Further, in the pressure gauge attached to the pipe as described above, since the check valve of the pressure indicating member can pass the fluid only toward the joint portion, the pressure gauge enters the pipe through the pressure indicating member. A fluid can be pressed in. In this case, since the pressure indicating member is only supported by the through hole by the O-ring, when the fluid pressure is applied, it slides to the housing side. At this time, the spring inserted into the pressure indicating member has one end abutting on the protrusion of the pressure indicating member and the other end abutting on the stopper of the insertion hole to urge the protrusion toward the joint side. The display member is slid toward the joint side. Therefore, the pressure indicating member slides back and forth according to the pressure in the pipe. For example, if the amount of protrusion of the pressure indicating member from the housing is changed by this sliding, the amount of change can be changed. The pressure inside the pipe can be measured by reading from the scale on the surface.

Similarly, in the pressure gauge according to the third aspect of the invention, the joint can be fitted to the end of the pipe to directly attach the housing to the pipe. At this time, the pressure injection pipe communicating with the through hole provided in the joint can prevent the fluid from flowing out of the pipe by the check valve, and thus the pressure gauge can seal the pipe. Further, in the pressure gauge attached to the pipe in this manner, the check valve can pass the fluid only in the joint direction, so that the fluid can be press-fitted into the pipe from the inlet of the pressure injection pipe. in this case,
When the fluid pressure increases, the internal pressure of the pressure receiving body whose one end communicates with the through hole of the joint increases due to the pressure, the coiled tube extends and its curvature changes, and the pointer attached to the other end Moving. Therefore, the pointer can display the rotation amount proportional to the pressure.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in the pipe inspection method according to the first aspect of the present invention, when piping such as water supply, hot water supply and gas is performed in a building under construction, fluid such as water or air is supplied to the pipes. The pressure gauge 5 is sealed under pressure, and the pressure gauge 5 is attached to the pipe filled with the fluid, and the pressure gauge 5 is attached until the pipe is connected to the main pipe 6, thereby preventing damage caused by construction work after the piping. It is designed so that it can be inspected.

That is, if the piping is damaged after the piping, the fluid that has been press-fitted leaks out and the pressure in the piping drops. Therefore, the pipe can be continuously inspected from the time of piping by checking the decrease in the pressure gauge 5 as needed.

Therefore, in order to perform a double airtight test both when piping and when passing water, the inspection after piping is performed without performing the work of filling the pipe with fluid and connecting the test pump and pressurizing. It is possible to prevent water leakage when passing water.

By the way, in the case of this inspection method, the pressure gauge 5
The conventional test pump may be used, but since it remains attached to the pipe for a long time, there is a problem in using an expensive and large-sized space-saving one such as the test pump.
Therefore, next, as an inexpensive and compact pressure gauge suitable for use in the above inspection method, FIG. 2 shows an embodiment of the plug type pressure gauge 7 according to the second invention.

The plug type pressure gauge 7 comprises a housing 10 fitted in the end of the pipe and a pressure indicating member 11 supported by the housing 10. The housing 10
The joint portion 12 is formed in a cylindrical shape at one end thereof, and the joint portion 12 is formed with a thread groove 13 having a smaller diameter than the housing 10 main body and engaging with a thread groove of a pipe end portion on the periphery.
Further, the other end of the housing 10 with respect to the joint portion 12 is formed in the same shape as a so-called kiss plug for closing the pipe, by forming a hexagon around the periphery, and has a compact and easy-to-use shape.

The housing 10 is provided with a through hole 14 penetrating the joint 12. The through hole 14 is formed such that a step portion 15 is provided in the main body of the housing 10 so that the joint portion 12 side has a small diameter and the housing side has a large diameter. The spring 16 is inserted into the through hole 12. The pressure indicating member 11 is inserted.

The pressure indicating member 11 has a scale 17 on the surface.
With a graduated pipe-shaped display member, a groove 18 is provided at the tip of the connecting portion 12 side, and an O-ring 19 is fitted in the groove to seal the outer periphery of the member 11 and the through hole 14. . In addition, an injection port 20 is formed at the rear end,
At the center between the inlet 20 and the O-ring 19, the protrusion 2 is provided.
1 is provided. One end of the spring 16 fitted into the pressure indicating member 11 comes into contact with the protrusion 21,
A ring-shaped lid member 22 that abuts the other end of the spring 16 is fitted to the end of the through hole 14 as a stopper. Therefore, the pressure indicating member 11 is pressed toward the joint portion 12 by the spring 16, and the protrusion 21 is pressed against the step portion 15 of the insertion hole 14 by the pressing.

A check valve 23 is screwed into the inlet 20 of the pressure indicating member 11. In this embodiment, as shown in FIG. 3, in the valve 23, a rod 26 to which a valve body 25 is fixed is attached to a valve body 24 via a spring 27 so as to move back and forth.
5 is pressed against the valve body 24.
By pushing down 6, the valve body 25 can be pushed down to open the flow path 28.

This embodiment is constructed as described above. Next, its operation will be explained by describing a case where the pipe inspection method according to the first invention is applied to a water pipe.

For example, when the framework of the building is completed, FIG.
When the piping is performed as shown in (1), the pipe 1 protruding outside the building is plugged to fill the inside of the pipe with water from the attachment hole of the indoor faucet. Then, the pressure gauge 7 is fitted into the faucet mounting hole by screwing the connecting portion 12 (as shown in FIG. 4, when a collective pipe such as a bathroom, a toilet or a washroom is used, the pipe is connected. Then, the plug type pressure type may be attached to any one of the faucet mounting holes, and the plug 1 may be attached to the other faucet mounting holes to collectively inspect the pipes). At this time, in the pressure indicating member 11 of the plug type pressure gauge 7, the protruding portion 21 is pressed by the spring 16 and is in contact with the step portion 15 of the through hole 14. Further, the valve 23 for non-return of the pressure indicating member 11 is closed by the extension of the spring 27 so that the valve body 25 is brought into pressure contact with the valve body 24. Therefore, the pressure gauge 7 can separate the inside and the outside of the pipe and seal the pipe.

Next, the pressure indicating member 1 of the plug type pressure gauge 7
1, for example, a conventional test pump is connected (at this time, the joint of the test pump is changed to a joint shape capable of engaging the inlet 20 of the pressure indicating member 11 by pressing the rod 26 of the valve 23, or , The inlet 20 of the pressure gauge 7 is adjusted to a shape that engages with the joint of the test pump), and water is pressed in. Then, water is pressed into the pipe through the pressure indicating member 11 by the check valve 23 to pressurize the pipe.
For this reason, the numerical value of the pressure gauge 5 of the test pump is read after the pressurization, and if the numerical value decreases, it is a construction error and the piping is redone. At this time, the plug type pressure gauge 7
Since the pressure indicating member 11 of FIG. 6 is only supported by the O-ring 19, the pressure inside the pipe becomes high, and when the pressure overcomes the pressure of the spring, the amount of protrusion from the housing 10 changes in proportion to the pressure. To do. Therefore, the pipe internal pressure can be measured by reading the scale amount 17 of the pressure indicating member for the amount of protrusion.

When the inspection at the time of construction is completed in this way, the test pump is removed from the plug type pressure gauge 7 and the plug type pressure gauge 7 is removed.
Remains installed until the building is finished and the pipe is connected to the main 6.

At this time, in the check valve 23 of the plug-type pressure gauge 7, the valve body is pressed against the valve body 25 by the spring to close the flow passage 28 and seal the pipe. When there is no water leakage, the protrusion amount of the pressure indicating member 11 is maintained as it is during press fitting.

If, during the remaining work, the pipe is damaged and leaks water and the pressure in the pipe is reduced, the pressure of the spring 16 of the pressure indicating member 11 of the plug type pressure gauge 7 is overcome, The amount of protrusion of the pressure indicating member 11 from the housing 10 is reduced.

Therefore, when the pipe is connected to the water main 6, the presence or absence of damage to the pipe can be inspected by checking the amount of protrusion of the pressure indicating member 11. Therefore, it is possible to carry out repairs before the passage of water and prevent water leakage during passage of water.

As described above, the plug-type pressure gauge 7 is capable of closing the pipe, displaying the pressure, and pressurizing the fluid into the pipe by directly mounting it on the pipe. Further, as described above, the plug type pressure gauge 7 has a simple structure and can be provided at a low cost.

5 and 6 show a plug type pressure gauge 7'according to the third invention as another embodiment of the plug type pressure gauge 7. As shown in FIG.

In this plug type pressure gauge 7 ', one end communicates with a through hole 30 formed in the end face of the joint portion 10 in a housing 10 having a joint portion 12 that fits with an end portion of a pipe.
A pressure injection pipe 31 provided with an injection port 20 at the other end, a check valve 23 for allowing fluid to pass through the pressure injection pipe 31 only toward the joint portion 12, and a through hole 30 of the joint portion 12.
To a pressure injection pipe 31 communicating with the pressure receiving pipe 32, which has a coiled hollow flat pipe whose one end is attached and the other end is closed, and a pressure indicating needle attached to the other end of the pressure receiving pipe 32. And 33.

The housing 10 has the same cylindrical shape as the plug type pressure gauge 7 according to the second invention, and has a joint portion 12 at one end thereof. The joint portion 12 has a diameter smaller than that of the main body of the housing 10, and a thread groove 13 that engages with the end of the pipe is formed around the joint portion 12. The circumference of the other end of the housing 10 is formed in a hexagonal shape, and a scale graduation 17 for displaying pressure is provided on the end face thereof.

A check valve 23 is screwed into the injection port 20 of the pressure injection pipe 31 provided in the housing 10. The check valve 23 is the same as that of the second invention. I am using. Therefore, the description is omitted here.

Further, the coil-shaped pressure receiving body 32 is made of an elastic metal, and in the case of this embodiment, the diameter thereof is formed so as to decrease toward the other end which is closed.

The embodiment is constructed as described above, and its operation will be described in the case where the water supply pipe is provided like the plug type pressure gauge 7 according to the second invention.

That is, like the plug type pressure gauge 7 according to the second aspect of the invention, this plug type pressure gauge 7'is also attached by screwing the joint portion 12 into the tap mounting hole of the water pipe.
At this time, the pressure injection pipe 31 communicating with the through hole 30 provided in the joint portion 12 can prevent the outflow of the fluid from the inside of the pipe by the check valve 23, so that the plug-type pressure gauge 7'is The pipe can be sealed.

Next, the pressure injection pipe 3 of the plug type pressure gauge 7 '.
A test pump is connected to the injection port 20 of No. 1 to inject water. At this time, the water is press-fitted into the pipe by the check valve 23, so that the pipe can be pressurized.
For this reason, the internal pressure of the pressure receiving body 32 whose one end communicates with the pressure injection pipe 31 and whose other end is hermetically sealed increases, the coiled pipe extends and its curvature changes, and the pointer 3 attached to the other end.
3 rotates in proportion to the pressure. At this time, the pressure receiving body 32 is
By decreasing the diameter toward the other end, the end pressure increases, the curvature increases, and the movement amount of the pointer 33 can be increased. Therefore, the pressure in the pipe can be inspected by reading the display of the pointer 33.

When the inspection at the time of construction is completed in this way, the test pump is removed from the plug type pressure gauge 7 ', and after the building of the plug type pressure gauge 7'is completed, the pipe is connected to the main pipe 6. At this time, the pressure in the pipe is held by the check valve 23, and when there is no water leakage after the pipe, the pressure at the time of press fitting is maintained. Therefore, the pointer 33 of the plug type pressure gauge 7'indicates the pressure at the time of press fitting.

At this time, if the pipe is damaged due to remaining work and leaks water, and the pressure in the pipe is lowered, the internal pressure of the pressure receiving body 32 is lowered and the indication value of the pointer 33 is small. Become.

Therefore, when connecting the water mains 6, by checking the rotation amount of the pointer 33, it is possible to inspect whether or not the pipe is damaged. Therefore, repair the pipe before water passage to prevent water leakage during water passage. Can be prevented.

Thus, this plug type pressure gauge 7'is
By directly attaching to the pipe, the pipe can be closed, the pressure can be displayed, and the fluid can be pressed into the pipe. Further, since it has a simple structure, it can be provided at a low cost. In addition, although the water pipe is described in the embodiments, the present invention is not limited to this, and the pipe inspection method and the pressure gauge according to the present invention can be used for a pipe for flowing a fluid such as a hot water supply pipe and a gas pipe.

[0045]

As described above, in the pipe inspection method according to the first aspect of the present invention, the pressure gauge is attached to the pipe into which the fluid is press-fitted and sealed, and the pressure gauge is attached until the pipe is connected to the main pipe. With this, it is possible to read the decrease in the pressure of the pipe from the pressure gauge and inspect the pipe for damage received after the pipe.

For this reason, it is possible to prevent water leakage when water is passed, without having to perform the airtightness test twice before piping and before passing water, thereby improving the efficiency of piping work.

The pressure gauge according to the second aspect of the invention has a pipe end having a pipe end fitted to the pipe end, a housing having a through hole communicating with the joint, and a spring provided in the through hole. With a simple structure consisting of a pipe-shaped pressure display member with a scale graduated on the surface of the member, it can be mounted directly on the pipe to close the pipe, display the pressure, and press fit the fluid into the pipe. An optimal pressure gauge can be provided for use in the inspection method according to the first aspect of the invention, which is required to be inexpensive.

Further, in the pressure gauge according to the third invention, one end is fixed to the pressure injection pipe communicating with the through hole of the joint,
With a pressure receiving body in which a hollow flat tube whose other end is sealed is formed in a coil shape, and a pressure indicator attached to the other end of the pressure receiving body, the pipe can be plugged with a simple structure. In addition to the effect that the pressure display and the fluid can be pressed into the pipe and a compact and inexpensive pressure gauge can be provided, since the pressure display can be displayed by the rotation amount, the display can be easily read.

[Brief description of drawings]

FIG. 1 is an operation diagram showing a pipe inspection method.

FIG. 2 is a sectional view showing an embodiment of a pressure gauge.

FIG. 3 is a sectional view showing an embodiment of a check valve of a pressure gauge.

FIG. 4 is an operation explanatory view for explaining the piping method of the embodiment.

FIG. 5 is a sectional view showing another embodiment of the pressure gauge.

FIG. 6 is a plan view showing another embodiment of the pressure gauge.

[Fig. 7] Operation explanatory diagram of water supply piping

FIG. 8 is a schematic diagram of a test pump.

[Explanation of symbols]

 1 Plug 2 Water Tank 3 Pressurizing Pump 4 Test Pump 5 Pressure Gauge 6 Main Pipe 7, 7'Plug-type Pressure Gauge 10 Housing 11 Pressure Display Member 12 Joint 13 Thread Groove 14 Through Hole 15 Step 16 Spring 17 Scale Scale 18 Groove Reference Signs List 19 O-ring 20 Injection port 21 Projection part 22 Lid member 23 Check valve 24 Valve body 25 Valve body 26 Rod 27 Spring 28 Flow path 29 Pipe 30 Through hole provided at the joint 31 Pressure injection pipe 32 Pressure receiver 33 Guideline

Claims (3)

[Claims] 1. When water supply pipes, hot water supply pipes, gas pipes, etc. are constructed during construction, a pressure is applied to the pipes to enclose the fluid, and a pressure gauge is attached to the fluid-enclosed pipes. A pipe inspection method that checks the drop of the pressure gauge during that period to check the pipe for damage by installing it until the pipe is connected to the main pipe. 2. A housing having a joint portion that fits with a pipe end portion and having a through hole communicating with an end face of the joint portion,
The pressure display member is inserted into the through hole via a spring and has a scale on the surface of the member. The pressure display member has an O-ring fitted at the front end on the joint side and is poured at the rear end. A non-return valve that forms an inlet and is provided with a protrusion that abuts one end of a spring that is inserted between the O-ring and the inlet, and that allows fluid to pass through the pressure indicating member pipe only toward the joint. 2. The plug type pressure gauge according to claim 1, further comprising a valve, wherein the through hole is provided with a stopper that comes into contact with the other end of the spring. 3. A pressure injection pipe having one end communicating with a through hole formed in the end face of the joint and a filling port provided at the other end in a housing having a joint fitting with the end of the pipe. A non-return valve that allows a fluid to pass through the pressure injection pipe only in the joint direction, and a pressure receiving body in which a hollow flat pipe whose one end communicates with the through hole of the joint and whose other end is sealed is formed in a coil shape. The plug type pressure gauge according to claim 1, further comprising a pointer for pressure display attached to the other end of the pressure receiving body.