JPH0523649Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a cap for a sewer pipe.

(Prior Art) In general, a sewage drainage system consists of a main pipe 5 buried underground under a road 51, as shown in Figs.
2. A public rainwater basin 54 and a public sewage basin 55 are connected to this by an attached pipe 53, a sewage basin 56 for each household is connected to this public sewage basin 55, and a pollution removal facility 57 for factory wastewater etc. .

When constructing such sewage facilities, especially when installing sewage facilities on newly developed land, etc., first bury the main pipe 52 underground, then install the public rainwater basin d and the public sewage basin 55, and then After installing sewage basins 56 for each user, these basins 5
4, 55, 56 and the main pipe 52 are attached to the pipe 53...
A method of connecting is used. Therefore, after burying the main pipe 52 and before starting the connection work for the attachment pipes 53, etc., the installation port 5 of the main pipe 52
In order to prevent earth and sand from falling into the pipe from 8.
It is common practice to cover the mounting opening 58 with a cap 59.

(Problem to be solved by the invention) Until now, the caps used here have been of the type where the mounting opening is covered from above with a cap-shaped lid, and of the type where a stopper-shaped lid is inserted into the mounting opening. things are known. However, the shape and structure of the installation port differed depending on the material and size of the main pipe, and there were also construction supervisors' preferences, so it was difficult to say which type was better. For this reason, construction companies have had to keep both types on hand at all times, and because of the large variety of pipe diameters, they have had to keep large quantities in stock.

The present invention aims to provide a cap with a structure that can be used in common to some extent even if the shape and structure of the attachment port or the pipe diameter changes, and as a result, the amount of inventory can be reduced.

(Means for Solving the Problems) The sewer pipe cap according to the present invention has a large-diameter fitting part at the top and a small-diameter fitting part at the bottom through a circumferential step. Each of them should be prepared. Further, it is more preferable to attach an elastic sealing material having an inverted U-shaped cross section to the opening edge of the fitting portion in order to achieve the object of the present invention.

(Function) This sewage pipe cap can be used by inserting the small diameter fitting part at the bottom into the main pipe installation opening to close the opening, and by inserting the large diameter fitting part at the top into the installation opening. How to use it by applying it from above and closing the opening.
Two methods can be adopted. In addition, if an elastic sealant with an inverted U-shaped cross section is attached to the fitting part of the cap or the opening edge of the main pipe installation port, the water sealing property will be increased, and even if the pipe diameter of the installation port changes slightly. Applicable.

(Example) Hereinafter, details of the present invention will be explained based on the drawings illustrating the invention.

Figure 1 shows a sewer pipe cap 10 according to the present invention.
1 is a circumferential step provided on this side wall, and this upper part 2 has a large diameter and forms a fitting part between it and the opening edge 3, while the step 1
The lower part 4 has a small diameter and forms a fitting part between it and the bottom surface 5.

If necessary, an elastic sealing material 21 made of SBR or the like having an inverted U-shaped cross section may be fitted from above (a and c) as shown in detail in FIG. ), a circumferential groove 22 is provided in advance on the inner surface near the opening edge 3, and a ring-shaped elastic sealing material 23 made of the same material is inserted into the circumferential groove (see figure b), so that the cap 10 can be used. It is possible to improve the water-sealing properties at times.

The elastic sealing material 21 can also reduce the insertion force when using the cap by providing a taper 24 on the inner surface of the nape (Fig. a) and providing several horizontal grooves 25 on the inner surface (see the same figure). can. The latter horizontal groove 25 is the sealing material 21 when the cap 10 is attached.
In addition to increasing the repulsion force and further enhancing the sealing effect, when sand adheres to the insertion part, it escapes there and prevents the water sealing property from being impaired.

On the other hand, the opening edge 3 itself is also provided with a flange 26 extending toward the outer periphery at the top thereof, and a corresponding groove 27 is provided on the inner surface of the insertion portion of the elastic sealing material 21 (Fig. c). When the cap 10 is removed from the main pipe installation port, the elastic sealing material 21 is prevented from coming off from the cap.

FIG. 3 shows the state when the main sewer pipe installation port 31 is closed with the main sewer pipe cap 10. Figure a shows the case where the smaller diameter insertion part (lower part) 4 of the cap 10 is inserted into the mounting opening 31 and closed. In this case, a portion with a smaller diameter below the stepped portion 1 is inserted into the mounting port 31 as the insertion portion 4, and the stepped portion 1 serves to position the insertion amount of the mounting port 31. In addition, since the insertion portion 4 slightly expands upward, when it is inserted, this outer wall surface and the inner surface of the mounting port 31 are elastically connected, which not only improves the waterproof function but also increases the diameter of the mounting port. Even if there is some variation, there is a certain degree of tolerance.

In use in this form, a cap 1 is attached to the opening edge 32 of the mounting port 31, as shown in FIG.
The cross section is an inverted U, similar to that used for the opening edge 3 of 0.
A letter-shaped elastic sealing material 41 may be fitted and mounted from above (Figure a), or a circumferential groove 42 may be provided in advance on the inner surface near the opening edge 32, and an annular elastic sealing material 43 may be inserted into the circumferential groove 42. (Figure b) may be inserted, thereby further enhancing the water-sealing function and widening the tolerance range due to variations in the diameter of the mounting port, thereby increasing practical value. Note that this elastic sealing material 41 may also be provided with a taper 44 on the inner surface of the top portion (FIG. A) or with several lateral grooves 45 on the inner surface, similarly to the above-mentioned one. These provide effects such as a reduction in the cap insertion force, an improvement in the sealing effect by increasing the repulsion force, and prevention of deterioration in water sealing properties when sand is attached.

On the other hand, FIG. 3B shows the case where the large-diameter fitting portion (upper portion) 2 of the cap 10 is attached to the upper surface of the mounting opening 31 to close it. In this case, a portion with a larger diameter above the stepped portion 1 is attached to the mounting port 31 as the fitting portion 2, and the stepped portion 1 plays the role of positioning the insertion amount of the mounting port 31 similarly to the former case. . Similar to the above, this fitting part 2 also expands slightly upward (downward in the figure), so
During insertion, this inner wall surface and the outer surface of the attachment tube are elastically joined, which enhances the waterproof function, and also allows for a certain degree of tolerance even if there is some variation in the diameter of the attachment port.

As mentioned above, at this time, the opening edge 3 of the fitting part 2
When an elastic sealing material 21 having an inverted U-shaped cross section is fitted into the opening, or an annular elastic sealing material 23 is inserted into a circumferential groove 22 previously provided on the inner surface near the opening edge 3. In addition to increasing the water sealing function, etc., the tolerance range due to variations in the diameter of the installation port is further increased, improving practical value.

The sewer pipe cap of the present invention is made of thin plates or sheets made of metal or synthetic resin. Examples include plastics such as polycarbonate, polyamide, polyimide, and polyester, and materials obtained by laminating these plastics and metals by appropriate means.

(Effects of the invention) According to the invention, the tolerance range is wide and commonality is high in correspondence with a wide variety of mounting port structures, so the number of parts to be constantly stored can be reduced.

A single cap can be used for both fitting and insertion, providing versatility and improving workability.

Furthermore, when an elastic sealant is attached to the opening edge of the cap, the side wall of the cap is elastically joined to the side wall of the installation opening, which improves the water sealing function and expands the tolerance range for the diameter of the installation opening. Increase practicality.

[Brief explanation of the drawing]

All drawings relate to embodiments of the present invention and are
The figure is a partially sectional front view showing the whole of the sewer pipe cap according to the present invention, Figures 2 a to c are enlarged end views of the opening edges of different embodiments of the sewer pipe cap, and Figures 3 a and b are longitudinal cross-sectional views showing different installation states of the cap to the main pipe installation port shown in Fig. 1, and Figs. 4a and b are enlarged views of the opening edge of the main pipe installation port in different forms, respectively. An end view, FIG. 5 is a cross-sectional explanatory diagram showing the entire sewage facility to which the present invention is applied, and FIG. 6 a
5 is an enlarged explanatory view of the piping system connecting the main pipe and the public sewage basin in FIG. 5, and FIG. 5B is an explanatory view showing the state of the main pipe installation port. Explanation of main symbols: 1...Step part, 2...Upper part (fitting part), 4...Lower part (inserting part), 10...Cap for sewer pipe.

Claims (1)

[Scope of utility model registration request] A sewer pipe cap comprising a large-diameter fitting part at the top and a small-diameter fitting part at the bottom via a circumferential step.