JP2001281088A - Drainage pipe leakage test method and test jig - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a drainage pipe leakage test method and a test jig which can perform work only on a floor to be tested and have excellent workability. A first obturator 1 is fitted to a vertical pipe receptacle 20 of a collecting pipe 14 on a floor to be tested, and the receptacle 20 is cooperated with a sealing mechanism and the first obturator 1. A vertical pipe 15 on the lower floor connected to the collecting pipe 14 while being hermetically sealed.
Is partially closed by the second obturator 2, and all the openings of the branch pipes 17, 18, and 19 are all closed. Then, a pressurized fluid is injected into the closed section of the pipe and pressurized for a certain period of time. Inspect for leaks while maintaining the pressurized state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for testing leakage of drainage pipes, and a test jig. The present invention relates to a method for inspecting the presence or absence of a test piece and a test jig used for the method.

[0002]

2. Description of the Related Art In a building having a multi-story building, a fullness test has been generally performed as a method for inspecting leakage of a drain pipe. In this water filling test, a part of the vertical pipe is sealed with a water filling joint, a closed plug is attached to the branch pipe branching from the collecting pipe on the floor to be tested, and the pipe is sealed, and water is injected from the upper part of the vertical pipe. This is a method to check for water leakage.

[0003] However, in this water filling test, a water-filled joint that is used only for the test must be provided on each floor, which causes an increase in construction cost. Also,
It takes a lot of time and effort to fill the water. For this reason, instead of the water filling test, as disclosed in Japanese Patent Application Laid-Open No. 2-221733, a method of injecting pressurized air into a pipe in a sealed section and inspecting the presence or absence of leakage by a change in the pressure is also available. Proposed. However, since this method employs a method of sealing a part (two places in total) of the vertical pipes on the upper and lower floors connected via the collecting pipe, there are the following problems.

[0004] That is, in the method disclosed in the publication, two obturators for sealing the vertical pipe are connected by a string,
These two obturators are suspended in the vertical pipe from the upper floor of the floor to be tested. Each of these two obturators expands by supplying a pressurized fluid to seal the vertical pipe, and the fluid source is also installed on the upper floor. For this reason, the work must be performed while coordinating between the floor to be tested and the upper floor, and the workability is extremely poor.

[0005]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above technical background, and has the following objects. An object of the present invention is to provide a drain pipe leakage test method and a test jig that can perform work only on the floor to be tested and are excellent in workability.

[0006]

Means for Solving the Problems The inventor of the present invention has conducted intensive studies in order to solve the above-mentioned problems, and as a result, focused on collecting pipes installed on each floor. As described above, this collecting pipe connects the vertical pipes on the upper and lower floors, and a seal mechanism is provided at a receiving port of the collecting pipe for receiving the vertical pipe on the upper floor. The present inventors have found that if the collecting pipe is hermetically sealed using this sealing mechanism, the leak test operation can be performed only on the floor to be tested.

That is, the present invention provides a leak test of a drain pipe having a pipe structure in which vertical pipes on the upper and lower floors are connected via collecting pipes installed on each floor, and a branch pipe branches from the collecting pipe on each floor. A method comprising: fitting a first tubular obturator into a vertical pipe receptacle of the collecting pipe on a floor to be tested, and connecting the receptacle with a sealing mechanism and the first obturator. While sealing by cooperation, a part of the vertical pipe on the lower floor connected to the collecting pipe is sealed by the second obturator,
Further, after all the openings of the branch pipe are sealed, a pressurized fluid is injected into the pipe in the sealed section and pressurized, and the pressurized state is maintained for a certain time to check for leakage. It is in the leak test method of the drain pipe to be performed.

The present invention also provides a drainage pipe leakage test fixture having a piping structure in which vertical pipes on the upper and lower floors are connected by collecting pipes installed on each floor, and a branch pipe branches from the collecting pipe on each floor. A first obturator fitted into a vertical pipe receptacle of the collecting pipe and sealing the receptacle by cooperating with a sealing mechanism thereof; First and second flow paths provided through the
First and second joint pipes provided at each upper end of the first and second flow paths and connected to a pressurized fluid source, respectively, and a flexible pipe connected to a lower end of the first flow path And a second obturator connected to the distal end of the flexible tube and expanding by the supply of pressurized fluid to seal a part of the lower vertical tube connected to the collecting tube. In the jig for tube leak test.

[0009] More specifically, the seal mechanism of the receiving port is an annular packing provided on the inner periphery of the receiving port. The pressurized fluid supplied to the first flow path and the second flow path is a pressurized gas such as air. The first obturator has its own weight against the pressure of the pressurized fluid in combination with the frictional force with the annular packing.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, a jig used for a leak test of a drain pipe will be described. FIG. 1 is a front view showing the entire test jig according to the present invention, and FIG.
It is a line sectional view. The test jig comprises a first obturator 1 and a second obturator.
And the closing device 2. The first obturator 1 is a cylindrical member, made of a material having a high density such as a stainless steel material, and has a flange portion 3 formed at an upper portion. The first closing device 1 is provided with a first flow path 4 and a second flow path 5 penetrating in the axial direction.

A first joint pipe 7 having a valve 6 is provided at an upper end of the first flow path 4, and a second joint pipe having a valve 8 and a pressure gauge 9 is provided at an upper end of the second flow path 5. A tube 10 is provided. A flexible pipe 12 made of a rubber hose or the like is connected to a lower end of the first flow path 4 via a joint pipe 11, and a second closing member 2 is connected to a distal end of the flexible pipe 12.
The second obturator 2 is a member that is hollow and expands by supplying a pressurized fluid to the inside, and is made of a material such as rubber.

Next, a leak test method using the above-described leak test jig will be described. FIG. 3 is a schematic explanatory view showing a leak test method. In a multi-story building, a collecting pipe 14 is installed through the floor slab 13 of each floor, and the vertical pipes 15 and 16 of the upper and lower floors are connected via the collecting pipe 14. From the collecting pipe 14, branch pipes 17, 18, and 19 are connected to a toilet, a kitchen, a washroom, and the like.

When performing the leak test, the second obturator 2 is suspended from the receptacle 20 of the collecting pipe 14 by the flexible tube 12 to the vertical pipe 15 on the lower floor. Into the receiving port 20. As shown in FIG. 4, an annular packing 2 made of rubber is provided on the inner periphery of the receiving port 20 of the collecting pipe 14.
1 is provided. The annular packing 21 is provided to ensure a sealing property with the vertical pipe 15 on the upper floor, which is originally connected to the receptacle 20.

The present invention utilizes the sealing property of the annular packing 21 provided in the receiving port 20. That is,
As shown in FIG. 5, the first obturator 1 is provided with the first port 1 so that the flange 3 is supported by the end face of the port 20.
When the obturator 1 is fitted, the annular packing 21 is deformed radially outward and comes into close contact with the outer periphery of the first obturator 1. Thereby, the receiving port 20 is sealed and the sealing property is secured.

Referring again to FIG. 3, when the first obturator 1 is fitted into the receiving port 20 of the collecting pipe 14 as described above, the hose 23 of the compressor 22, which is a source of pressurized fluid, is connected to the first fluid. Connect to the joint pipe 7. Then, the compressor 22 is operated, the valve 6 is opened, and pressurized air is supplied to the second obturator 2 through the first flow path 4 and the flexible tube 12 to pressurize the second obturator 2. (About 0.1 MPa in gauge pressure) Inflate.

As a result, the second obturator 2 comes into close contact with the inner periphery of the vertical pipe 16 on the lower floor, a part of the vertical pipe 16 is sealed, and the valve 6 is closed after the sealing. On the other hand, branch pipes 17, 18,
All 19 openings are sealed with a commercially available sealing plug 24.
The processing by the sealing plug 24 may be performed in parallel with the installation of the first and second closures 1 and 2, or may be performed before and after that.

As described above, when the section to be tested is sealed, the hose 23 of the compressor 22 is connected to the second joint pipe 10, the valve 8 is opened, and the second flow is introduced into the pipe of the sealed section. Pressurized air is injected through the passage 5 and pressurized until a constant pressure (gauge pressure of about 0.035 MPa) is reached.
Then, the valve 8 is closed to maintain the pressurized state for a certain time,
The presence or absence of reduced pressure, that is, the presence or absence of leakage is confirmed by the pressure gauge 9. To specify the location of the leak, refer to Japanese Patent Laid-Open No. 22273/1990.
As described in Japanese Patent Publication No. 3 (1993), a soap solution may be applied to the outer periphery of the pipe, or smoke or odor may be mixed with the pressurized air.

Due to the injection of pressurized air into the sealed tube, the first obturator 1 has an upward force, that is, the collecting tube 14.
A force that tries to escape from the receiving port 20 acts. For this reason, the first closing device 1 has its own weight capable of withstanding the pressure in combination with the frictional force with the annular packing 21.
In order to ensure such a weight at the required size, the first obturator is made of a high-density material such as stainless steel as described above. Of course, an appropriate clamp device for fixing the first closing device 1 to the collecting pipe may be added irrespective of only the own weight and the frictional force.

The above embodiment is merely an example, and the present invention can be variously modified. For example, when performing the leak test method according to the present invention, the branch pipes 17, 1
Pressurized air can be injected from either one of 8, and 19, so that a leak test can be performed without necessarily using the test jig. However, according to the test jig, instruments necessary for the test are compactly arranged, and the test can be performed smoothly.

Further, in the above embodiment, the pressurized air is used as the pressurized fluid for inflating the second obturator 2 or for injecting it into the sealed tube. Can be used. Further, a pressurized liquid such as water can be used instead of the pressurized gas.

[0021]

As described above, according to the present invention, the work can be performed only on the floor targeted for the leak test, so that the workability is improved, the construction time is reduced, and the construction cost is reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire test jig according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a schematic explanatory view showing a leak test method.

FIG. 4 is a sectional view of a receiving port of the collecting pipe.

FIG. 5 is a cross-sectional view showing a state where a first obturator is fitted to the receptacle.

[Explanation of symbols]

 1: First obturator 2: Second obturator 4: First flow path 5: Second flow path 6: Valve 7: First joint pipe 9: Pressure gauge 10: Second joint pipe 12 : Flexible pipe 14: Collecting pipe 15, 16: Vertical pipe 17, 18, 19: Branch pipe 20: Receptacle 21: Annular packing 22: Compressor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiaki Sugawara 2-3-5 Misaki-cho, Chiyoda-ku, Tokyo Inside Tetsuken Construction Co., Ltd. (72) Yoshinori Miyasaka 2-5-2 Misaki-cho, Chiyoda-ku, Tokyo No. 3 Inside Tekkaken Construction Co., Ltd. (72) Inventor Yuichi Hirama 2-3-5 Misakicho, Chiyoda-ku, Tokyo Inside Tekkaken Construction Co., Ltd. (72) Kazufumi Mori 2-5-2 Misakicho, Chiyoda-ku, Tokyo No. 3 Inside Tekkaken Construction Co., Ltd. (72) Inventor Seizo Kojima 5-1-1 Hirokawacho, Nakagawa-ku, Nagoya-shi, Aichi Prefecture Inside Kojima Seisakusho (72) Inventor Yozo Kako 5-chome, Hirokawacho, Nakagawa-ku, Nagoya-shi, Aichi Prefecture 1st Kojima Seisakusho Co., Ltd. (72) Inventor Kisoji Ota 5-1-1 Hirokawacho, Nakagawa-ku, Nagoya-shi, Aichi F-term in Kojima Seisakusho (Reference) 2D061 AA04 AB05 2G067 AA12 BB34 CC04 DD02

Claims (6)

[Claims] A method for leak testing a drain pipe having a pipe structure in which vertical pipes on upper and lower floors are connected via collecting pipes installed on each floor, and a branch pipe branches from the collecting pipe on each floor. The first pipe is inserted into the vertical pipe socket of the collecting pipe on the floor to be tested.
Of the vertical pipe on the lower floor connected to the collecting pipe, while the receiving port is closed by cooperation of the sealing mechanism and the first plug. After closing all the openings of the branch pipe, a pressurized fluid is injected into the pipe in the closed section and pressurized. A leak test method for drainage pipes, characterized by inspecting a drainage pipe. 2. The method according to claim 1, wherein the seal mechanism of the receptacle is an annular packing provided on an inner periphery of the receptacle. 3. A leak test jig for a drain pipe having a pipe structure in which vertical pipes on upper and lower floors are connected by collecting pipes installed on each floor, and a branch pipe branches from the collecting pipe on each floor. A first obturator fitted into a vertical tube receptacle of the collecting pipe and sealing the receptacle by cooperating with the sealing mechanism; and a first obturator penetrating the first obturator in the axial direction. First and second flow paths provided; first and second joint pipes provided at respective upper ends of the first and second flow paths and connected to a pressurized fluid source, respectively; A flexible pipe connected to the lower end of the first flow path; and a part of a lower vertical pipe connected to the tip of the flexible pipe, expanded by supply of pressurized fluid and connected to the collecting pipe. A leak test jig for a drain pipe, comprising: a second closing device for sealing. 4. The jig according to claim 3, wherein the seal mechanism of the receptacle is an annular packing provided on an inner periphery of the receptacle. 5. The drain pipe according to claim 3, wherein the pressurized fluid supplied to the first flow path and the second flow path is a pressurized gas such as air. Jig for leak test. 6. The first obturator has a dead weight against the pressure of the pressurized fluid in combination with the frictional force with the annular packing. 5. The jig for a water leakage test of a drain pipe according to 5.