JPH03636Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sewerage shutoff device that can shut off a flow within a sewerage system or ensure a certain constant flow rate.

[Conventional technology]

An air plug as shown in FIG. 4 is known as a means for temporarily stopping the flow of sewage during sewerage work. This air plug is available in various sizes to match the pipe diameter, and air is injected into the air plug 01 from the air pipe 02 at the site to inflate the air plug 01 in the radial direction and make it tightly adhere to the inner wall surface of the pipe 03. This is to stop the flow.

The above-mentioned air plugs are widely used not only in sewers but also in gas pipes, etc., but they have the following drawbacks.

[Problems with the Prior Art] a. Since there is no margin in the outer diameter when air is injected, it is necessary to prepare various sizes for each pipe diameter, which is inconvenient.

b In the case of sewerage systems, household or industrial wastewater flows continuously, so if the flow is blocked for a long time, the pipes will become full and overflow, so a separate bypass route should be installed. However, this makes construction costs very high.

c. If there are irregularities in the pipes or canals, gaps will occur, making it easy for water to leak.

Therefore, a water stop device described in Japanese Utility Model Application Laid-Open No. 54-51612 is known to improve the above-mentioned drawbacks a and c. Since this water stop device is inflated by injecting air into an elastic bag-like body, it is compatible with a certain pipe diameter, but since the cross section is circular, it can be used for a considerable amount of water as a sewer pipe. When applied to an oval-shaped tube (O-shaped tube) that occupies a large area, there is a drawback that the upper and lower surface pressures are insufficient compared to the left and right surface pressures, and the water-stopping property is poor. For this reason, in the case of an egg-shaped tube, a bag with such a shape must be prepared separately. Also, in sewer construction, it is necessary to flow a constant flow rate, and the water level to be flushed varies depending on the type of construction and the amount of sewage, but since the bypass cited above is located at the center of the bag, The disadvantage is that the water level is determined by the radius of the bag.

Next, a water stop device described in Japanese Utility Model Application Laid-Open No. 54-89624 is known to improve the above drawback (b).
This water stop device has a structure in which a stop is attached to a bypass. However, this publicly known example is also
As with 54-51612, there is a bypass in the center of the bag, so the water stop level is determined by the radius of this bag, and adjusting the water volume with a kettle means that leaves, etc. will wash down like sewage. However, it is not practical in this case, and it is necessary to clean it once it is used, but this cannot be done sufficiently if a water stopper is attached, which has the disadvantage that the life of the water stop device is short.

The present invention has been proposed in view of these points, and its first purpose is to propose a sewerage shutoff device that can be used not only for pipes with a perfectly circular cross section, but also for pipes with an egg-shaped cross section. The second purpose is to propose a sewer shut-off device that can set the cut-off water level arbitrarily, and the third purpose is to propose a sewer shut-off device that ensures a bypass that is not affected by solid matter such as leaves. The fourth purpose is to propose a sewer shutoff device that can be kept clean at all times.

[Means to solve the problem]

The structure of the present invention, which achieves the above-mentioned first to fourth objects with one water stop device, is as follows.

The bag body shall be made of a flexible and airtight material, and its outer shape shall be a flat rectangle when air is removed from the inside; The air hose for this purpose is installed at a horizontal position close to the upper side of the bag body, and the bypass passage passing through the bag body is made of the same material as the bag body at a position near the bottom side opposite to the air hose. the bag body is formed and air is injected into the bag body, and the bag body is closed by internal pressure when nothing is inserted therein; and the bag body is capable of being freely inserted into the bypass passage; A sewerage shutoff device characterized by: a bypass opening pipe made of strength enough to overcome the internal pressure of the bag body is attached.

[Effect]

The air is removed from the bag body before it is inserted into the water stop location, and air is injected from the air hose at a predetermined position to inflate the bag body, and the bag body is brought into close contact with the inner surface of the pipe to stop water. When the work is completed and the bag is to be removed from the pipe, the air is removed from the bag body through an air hose and the bag body is deflated into a flat rectangular shape.

The above is a case where a bypass is not taken, and the bypass passage of the bag body is blocked by internal pressure.
When taking a bypass, insert a bypass opening pipe into the bypass passage in advance. In this way, even if the bag body swells, the bypass is ensured.

Note that the water stop level is automatically determined by determining the insertion position of the bag body, that is, the position of the bypass opening pipe in the circumferential direction by rotating the bag body.

〔Example〕

1 and 2 show an embodiment of a shutoff device (stopper) according to the present invention. The reference numeral 1 indicates a bag body made of a flexible and airtight material (for example, rubber), and the bag body 1 has a flat rectangular shape when the air is removed. It is installed horizontally near the top edge of the

Reference numeral 3 denotes a bypass passage formed so as to pass through a position near the lower side of the bag body 1, and this bypass passage 3 is made of the same material as the bag body 1 and has a shape that is closed by the internal pressure of the bag body. It is.

FIG. 3 shows a state in which the sewer line is shut off using the above-mentioned shut-off device. This operation involves first inserting the bag body 1 into which no air is injected into the sewer line 4, and then inserting the bag body 1 into the bag body 1 through the air hose 2. It is inflated by injecting air and brought into close contact with the inner surface of the sewer 4. In this way, the bypass passage 3 is crushed and closed by the air pressure from the surroundings, and sewage does not flow through the bypass passage 3. If the work is for a short time or the amount of sewage flowing is small, work will proceed in this state, but if there is a concern that sewage will overflow during the work time, insert the bypass opening pipe 5 into the bypass passage 3. , the bypass passage 3 is pushed open and the sewage flows downstream via the bypass opening pipe 5.

Further, the water cutoff amount (water level) is adjusted by changing the position of this bypass opening pipe 5. Also, if you want to stop the bypass, just pull out the bypass opening pipe.

[Effects of this invention]

As described above, in this invention, the bag body is formed of a material with flexibility and temperament that expands when air is injected, and a bypass passage is provided in the bag body, so that the following effects can be achieved. .

a Since the bag body is flexible, one bag can be used for pipes or passages with a diameter slightly smaller than the maximum expansion amount, and there is no need to prepare items of various sizes, and there is no need for air to be injected. Since it can be folded into a small size, it is easy to insert.

b The shape of the bag body is a flat rectangle when the air is removed, so when it is aligned with the egg-shaped tube (channel), the overall surface pressure becomes almost uniform and water-stopping properties are improved.

(c) If the bypass opening pipe is not inserted into the bypass passage, the flow can be completely blocked, and when a bypass is desired, the bypass can be easily established by simply inserting the bypass opening pipe 5 into the bypass passage.

d By freely setting the position of the bypass opening pipe (bypass passage) in the circumferential direction, the water stop level can be freely determined.

e Since the bag body is flexible, it fits well even if there are irregularities in the pipe or canal, and it adheres closely, so there is no risk of water leaking.

f By folding, it can be easily carried and stored, and it can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the shutoff device according to the present invention;
The figure is a perspective view of the shutoff device with air injected.
FIG. 3 is an explanatory diagram of an example of use of the shutoff device according to the present invention, and FIG. 4 is an explanatory diagram of a conventional air plug. 1... Bag body, 2... Air hose, 3...
...bypass passage, 4...sewer, 5...bypass opening pipe.

Claims (1)

[Claims for Utility Model Registration] The bag body is made of a flexible and airtight material, and its outer shape is a flat rectangle when air is removed from the inside; The air hose for injecting and discharging air must be installed horizontally near the top of the bag body, and the bypass passage that runs through the bag body must be located close to the bottom side on the opposite side from the air hose. The bypass is made of the same material as the bag body, and is in a state where air is injected into the bag body, and is closed by the internal pressure within the bag body when nothing is inserted inside; A sewerage shutoff device characterized by being attached to a bypass opening pipe that can be freely inserted into a passage and is made strong enough to overcome the internal pressure of the bag body.