JPH0538040U - Manhole fittings - Google Patents

Abstract

(57) [Summary] [Purpose] The sewage pipe for connecting manholes can be exchanged to connect with the tail pipe that has already been installed, and the pipe with ribs for sewage can be connected to the manhole. A fitting for a manhole for a pipe with ribs for sewage. [Structure] A short pipe provided with a saddle fixed to a side wall of a manhole is provided, and a pipe end of a sewage ribbed pipe having annular ribs on the outer surface at regular intervals is provided between the annular ribs. In a joint for connecting a manhole inserted through a rubber ring attached to, the inner surfaces of both ends of the short pipe are tapered surfaces, and the inner diameter of the main part of the short pipe excluding the both ends is The length of each short pipe end is equal to 1/2 of the rib interval.
The length of the short main part is 4 with the same rib interval.
It is characterized by being doubled to seven times.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manhole joint used for connecting a sewage ribbed pipe and a manhole.

[0002]

[Prior Art]

 When connecting a sewage pipe to a manhole, as shown in FIG. 5, a saddle 21 'is attached to a short pipe 2', and a rubber ring 5'is attached to the short pipe 2 ', which is a joint for a manhole A'. One end of the manhole side wall 12 'is inserted into the hole 11', the saddle 21 'is fixed to the manhole side wall 12' with an adhesive, and the sewer pipe 4 is attached to the manhole joint A '. It is publicly known that the short pipe 2'and the sewer pipe 4'are stopped by a rubber ring 5'by inserting an insertion port of '.

According to this connection structure between the sewer pipe and the manhole, the sewer pipe 4 ′ (referred to as a manhole connecting sewer pipe) connected to the manhole 1 ′ in FIG. To connect the tail pipe 401 'of the series of sewer pipes 400', the manhole connecting sewer pipe 4'is released to the manhole 1'side, and then the sewer pipe 4'is pulled back. It is possible to use a so-called interaction method in which the tail tube 401 'is connected by a receiving / inserting method.

[0004]

[Problems to be solved by the device]

 As a plastic pipe for sewage, a ribbed pipe having annular ribs provided at regular intervals on its outer surface is known, and has excellent external pressure strength due to the reinforcing action of the ribs.

In order to connect the ribbed pipe to the manhole by the above-mentioned exchange method, the ribbed pipe for connecting the manhole must be inserted into the short pipe of the joint for the manhole with the rubber ring attached. However, as the pipe with ribs for connecting the manhole escapes to the manhole side, the rubber ring attachment part escapes from the end on the inner side of the short pipe and enters the manhole, and with the pullback of the pipe with ribs. The part where the rubber ring is attached is press-fitted from the inside of the manhole into the inside end of the short pipe. Therefore, problems such as damage due to the rubber ring being caught at the inner end of the short pipe, which cannot be considered in the conventional joint for a manhole, occur.

In the above, if the length of the short pipe of the manhole joint is increased, it is possible to avoid the rubber ring from entering and leaving at the inner end of the short pipe, but in this case, the manhole joint Increasing the size is inevitable.

As described above, it is difficult to connect the ribbed tube to the manhole with the conventional manhole joint. The purpose of the present invention is to provide a manhole for connecting a sewer pipe for connecting a manhole to an existing tail pipe so that the sewer ribbed pipe can be connected to the manhole. To provide a joint for use.

[0008]

[Means for Solving the Problems]

 The joint for a manhole of the present invention has a short pipe provided with a saddle fixed to the side wall of the manhole, and this short pipe has a sewage rib pipe having annular ribs on the outer surface at regular intervals. In a joint for connecting a manhole in which a pipe end is inserted through a rubber ring mounted between annular ribs, the inner surfaces of both ends of the short pipe are taper surfaces, and both ends of the short pipe are The inner diameter of the main part excluding the part is uniform, the length of each short pipe end is 1/2 to 1/4 of the rib interval, and the length of the short pipe main part is the same rib interval. It is 4 to 7 times larger than the above.

[0009]

[Action]

 Since the taper surfaces are provided on the inner surfaces of both ends of the short pipe, the rubber ring at the end of the pipe with ribs for sewage in which a rubber ring is mounted between the annular ribs has one end of the short pipe (the short pipe outside the manhole The end of the pipe with a rubber ring is attached to the other end of the short pipe (the short pipe inside the manhole) when passing through the end) and when pulling back after the above-mentioned pipe with ribs for sewage is released to the manhole side. When passing through the end, damage to the rubber ring due to kinking at the short pipe end can be well prevented.

Therefore, it becomes possible to exchange the ribbed pipe while preventing the rubber ring from being damaged and keeping its water blocking property well. Furthermore, since the end of the pipe with ribs can be supported by four or more annular ribs inside the short pipe, it is possible to prevent the annular rib in the short pipe from sagging due to a load such as earth pressure acting on the sewer pipe. The rubber ring in the short pipe can be stably held against the same load, and the water stop between the short pipe and the pipe with ribs for sewage can be stably maintained.

Furthermore, the length of the short pipe main portion is set to 7 times or less of the rib interval, and the length of the taper surface at both ends of the short pipe is set to 1/4 to 1/2 of the rib interval. Since the length is sufficiently short, the size of the short pipe can be reduced, and the short pipe can be easily attached to the manhole.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a part of a joint for a manhole according to the present invention in a partial cross section, which is constituted by a short tube integrally having a saddle 21.

FIG. 2 shows a connection structure between a ribbed sewer pipe and a manhole using the manhole joint of the present invention. In FIG. 2, 1 is a manhole, and 11 is a hole formed in the manhole side wall 12. Reference numeral A denotes a manhole joint of the present invention, in which a short pipe 2 is provided through a hole 11 of the manhole side wall 12 by fixing it to a manhole side wall 12 with an adhesive 3 in a saddle 21. Reference numeral 4 denotes a pipe with ribs for connecting a manhole, and annular ribs 41 are formed on the outer surface of the pipe at regular intervals. Reference numeral 5 denotes a rubber ring mounted between the annular ribs 41, 41 of the ribbed pipe end portion 40. The ribbed pipe end portion 40 is inserted into the short pipe 2, and the rubber ring 5 is pressed against the short pipe inner surface 200. The compression ratio of the rubber ring 5 is usually 10% to 30%.

As shown in FIG. 1, in the joint for a manhole of the present invention, there is a taper surface 22 on the inner surfaces of both ends of the short tube 2, and the inner diameter of the main part 20 of the short tube excluding the both ends. And the length l of each end is set to 1/4 to 1/2 of the rib interval of the ribbed tube 4, and the length of the tubular body main part 20 is set to 4 to 7 times the rib interval. .. The inner diameter of the short tube main body 20 is usually 1.003 to 1.009 times the maximum outer diameter (outer diameter of the annular rib) of the ribbed tube 4, preferably 1.0065 times.

A hard vinyl chloride product is usually used for the manhole joint A (thickness of the short pipe main body, thickness of the saddle is 5 to 10 mm, and outer shell dimension is the outside of the short pipe main body). It may be made larger than the diameter by about 80 mm or more), and may be made of other thermoplastic resin such as polyethylene, or may be an injection molded product or a secondary processed product. As the secondary processed product, for example, the diameter of a hard vinyl chloride pipe is reduced (usually 95% to 60%, preferably 95% to 85%), and the inner diameter is smaller than the outer diameter of the reduced diameter pipe. Diameter (60% to 80% of the outer diameter of the reduced diameter pipe) is heated near the hole of the rigid vinyl chloride plate, and an adhesive is applied to the periphery of the hole. The pipe is press-fitted, and both ends of the reduced diameter pipe are immersed in a heating oil bath for a predetermined length to expand the diameter to obtain taper surfaces at both ends of the pipe, or as shown in FIG. , A rigid vinyl chloride plate 21 (a curved plate 21) having a hole 210 slightly smaller than the outer diameter of the short pipe 2 made of hard vinyl chloride (the inner surface of one end is chamfered and the other end is shaped like a trumpet). ) Is heated around the hole 210 (shown by h), the short tube 2 is inserted into the hole 210, and the hole 2 of the curved plate 21 is inserted. 0 is formed in the sleeve 211, after cooling, the short tube 2 is drawn out, and then the adhesive 212 is applied to the inner surface of the sleeve 211, the outer surface of the short tube 2, or both, and the short tube 2 is again formed. It is possible to use, for example, the one which is fixed by inserting it into the sleeve 211 of the curved plate 21 (this inner diameter is equal to the inner diameter of the short tube 2).

In FIG. 2, reference numeral 400 denotes a series of existing sewage ribbed pipes, which is a receiving / inserting method via a rubber ring from the far side of the manhole 1 toward the manhole 1. , And 401 indicates a tube with the rearmost rib.

In FIG. 2, to connect the manhole connecting rib-equipped tube 4 and the rearmost rib-equipped tube 401 to be connected to the manhole 1, first, as shown in FIG. The ring-attached ribbed pipe end portion 40 is inserted into the short pipe 2 of the manhole joint, and the manhole connecting ribbed pipe 4 is released to the manhole 1 side with respect to the rearmost ribbed pipe 401. , The manhole connecting ribbed pipe 4 is pulled back and connected to the rearmost ribbed pipe 401 by a receiving / inserting method. In this case, the rubber ring mounting rib tube end 40 is pulled into the short tube 2 as the manhole connecting rib tube 4 is pulled back, and the rubber ring 5 is pressed against the inner surface of the short tube main body portion 20. -Water is stopped between the tube 4 with rib connecting ribs and the short tube 2.

In the above, when inserting the rubber ring mounting pipe end portion 40 of the manhole connecting ribbed pipe 4 into the short pipe 2, and when inserting the rubber ring mounting pipe end portion 40 into the manhole 1. When the rubber tube 5 is pulled back into the short pipe 2, the rubber ring 5 supported by the annular rib 41 is gradually compressed by the taper inner surface 22 at the end of the short pipe while the short pipe is being compressed, as shown in FIG. Since the rubber ring 5 is pulled into the inside 2, the degree of addition of the compression strain is gentle, and the rubber ring 5 can be well prevented from being damaged.

In FIG. 2, a rib portion below the ribbed pipe end portion 40 in the short pipe 2 is subjected to a load such as earth pressure received by the sewage ribbed pipe 4 connected to the manhole 1. Although a compressive force is applied to the short pipe 2, the number of ribs 41 supporting the ribbed pipe end portion 40 in the short pipe 2 (the number of ribs in the short pipe main portion 20) is set to 4 or more and sufficiently increased. Therefore, the compressive force applied to each rib 41 in the short pipe 2 can be sufficiently reduced, the settling of each rib 41 can be well prevented, and the pressure contact state between the rubber ring 5 and the short pipe inner surface 200 can be prevented. Good retention (pressurized state can be maintained uniformly in the circumferential direction).

In the above description, the length of the short pipe main body portion 20 is set to 7 times or less of the rib interval, and the length of the short pipe end portion on the inner surface of the taper is set to 1/4 to 1/2 of the rib interval. , the length of the short pipe 2 to be sufficiently short (short tube end Te - angle Pas inner surface is 10 ⁰ to 45 ⁰ preferably is 1 5 ⁰ - 30 ^0, Tankantan director, l is the rib spacing If it is 1/4 or less, the height H cannot be made sufficiently larger than the protruding height h of the rubber ring 5 from the rib 41 in FIG. It is easy to attach the short tube 2 to the manhole side wall 12, and it is also easy to insert the rubber ring mounting rib-equipped tube end portion 40 into the short tube 2.

According to the manhole coupling of the present invention, as described above, the ribbed pipe for connecting the manhole can be easily exchanged with the existing tail pipe without damaging the rubber ring. This is also clear from the following test example.

Test Example 1 As the ribbed tube, a vinyl chloride tube having an inner diameter of 250 mm, a rib outer diameter of 286.2 mm, an inter-rib groove portion outer diameter of 25 8.8 mm, and a rib interval of 30.5 mm was used. This invention of sailing - Le fitting short tube inner diameter 287.8Mm, short tube main unit length 150 mm, internal surface Te - pa edge length 10 mm, Te - Pas angle of 30 ^0, thickness 9 mm, total length 170 mm, Sad Le A hard vinyl chloride injection-molded product of 400 mm square and 5 mm saddle thickness was used, and the saddle of this manhole joint was adhesively fixed to the side wall of the manhole with a two-component curing type epoxy bonding agent.

Then, a rubber ring is attached to the pipe end of the ribbed pipe (the outer diameter of the attachment is 294 mm), the pipe end is inserted into the short pipe, and then the rubber ring is pulled back to the center of the short pipe. Positioned.

In this case, the maximum force required during the insertion / retraction of the end portion of the rubber ring-attached ribbed tube was about 55 kg, and no damage was observed on the rubber ring. Test Example 2 As the ribbed pipe, a vinyl chloride pipe having an inner diameter of 200 mm, a rib outer diameter of 228.8 mm, an interrib rib groove outer diameter of 20 7.7 mm, and a rib interval of 25.4 mm was used. Of the present invention sailing - Le fitting short tube inner diameter 230.1Mm, short tube main unit length 125 mm, internal surface Te - Pas end length 8 mm, Te - Pas angle of 30 ^0, thickness 7 mm, total length 141 mm, saddle 340mm Using a hard vinyl chloride secondary processed product having a corner and a saddle thickness of 5 mm, the ribbed tube was exchanged in the same manner as in Test Example 1 (the outer diameter of the rubber ring mounted was about 235 mm). The maximum force required in this case was about 50 kg, and no damage was observed on the rubber ring as in Test Example 1.

[0025]

[Effect of the device]

 The manhole fitting of the present invention is constructed as described above, and even if the end of the ribbed pipe with the rubber ring is inserted into the short pipe attached to the manhole and then pulled back, the rubber ring is not damaged. Since there is no need to do so, the pipe with ribs for connecting the manhole can be easily connected to the existing tail pipe by the exchange method. In addition, the rib end can be stably supported by ribs in the short pipe against load such as earth pressure, and deformation of the rubber ring in the short pipe due to the same load can be prevented well, and the rib for connecting the short pipe and the manhole can be prevented. It is possible to stably maintain the waterproof property with the attached pipe.

Furthermore, since the size of the short pipe can be made sufficiently small, it is easy to attach the short pipe to the manhole and to insert the rubber ring mounting pipe end portion of the pipe with ribs for connecting the manhole into the short pipe. It can be carried out.

[Brief description of drawings]

FIG. 1 is a plan view showing a part of an embodiment of the present invention in section.

FIG. 2 is a plan view showing a partial cross-section of a connecting structure between a ribbed tube and a manhole using the manhole joint of the present invention.

FIG. 3 is an explanatory view showing an example of a method for manufacturing a manhole joint of the present invention.

FIG. 4 (a) is a plan view partially showing a cross-section of an exchanging method for connecting a ribbed tube to a manhole by using the joint for a manhole of the present invention, and FIG. (B) is a partial cross-sectional view showing a state where the rubber ring-attaching rib-equipped pipe end portion is inserted into the short pipe during the same construction.

FIG. 5 is a plan view, partly in cross section, of a connection structure between a sewage pipe and a manhole, which uses a conventional joint for a manhole.

[Explanation of symbols]

 1 Manhole 12 Side Wall A Manhole Joint 2 Short Pipe 20 Short Pipe Main Body 21 Saddle 22 Taper Inner Surface of Both Ends of Short Pipe 4 Pipe with Rib for Sewage 41 Rib 5 Rubber Ring

Claims (1)

[Scope of utility model registration request] 1. A short pipe provided with a saddle fixed to a side wall of a manhole, and a pipe end portion of a pipe with ribs for sewage, which has annular ribs on its outer surface at regular intervals, has an annular shape. In a joint for manhole connection inserted through a rubber ring mounted between ribs, the inner surfaces of both end portions of the short pipe are tapered surfaces, and the main portion of the short pipe except for the both end portions thereof is The inner diameter is uniform, the length of each short tube end is 1/2 to 1/4 of the rib interval, and the length of the short tube main part is 4 to 7 times the rib interval. A fitting for a manhole, which is characterized in that