JP3959233B2

JP3959233B2 - Rib pipe connection structure

Info

Publication number: JP3959233B2
Application number: JP2000381961A
Authority: JP
Inventors: 洋史西堀
Original assignee: Mitsubishi Plastics Inc
Current assignee: Mitsubishi Plastics Inc
Priority date: 2000-12-15
Filing date: 2000-12-15
Publication date: 2007-08-15
Anticipated expiration: 2020-12-15
Also published as: JP2002181266A

Description

【０００１】
【発明の属する技術分野】
本発明は、リブパイプの接続構造に関し、詳しくは、一方のリブパイプ端部に形成した受口に、他方のリブパイプ端部に形成した差口を挿入し、該差口の外周に嵌着したシールリングにより接続部のシールを行うリブパイプの接続構造に関する。
【０００２】
【従来の技術】
リブパイプ同士を接続する際の接続構造として、例えば実公平７−３５１８８号公報に記載された構造が知られている。この接続構造は、差口となる部分に設けられている一対のリブ間にシールリングを嵌着し、この状態で差口を受口内に嵌入することにより、両リブパイプを接続するとともにシールリングによって所定のシール性を得るようにしたものである。
【０００３】
【発明が解決しようとする課題】
しかし、従来の接続構造において、差口の外周に設けられている複数のリブは、差口以外に設けられているリブと同一形状に形成されており、その外径は、受口の内径より僅かに小さいだけとなっている。したがって、リブパイプ同士を接続した場合、受口内に嵌入した差口部分のリブ外周縁と受口内面とがほとんど接触したような状態になるため、リブパイプ同士は同一直線上に接続されることになり、接続角度の調節は困難であった。また、地中埋設時に地震等の土圧が強く作用して接続部に曲げ応力が加わると、受口内面にリブが強い力で押付けられることになり、受口等に損傷を与えるおそれもあった。
【０００４】
そこで本発明は、リブパイプ同士を接続する際の角度調節を可能にするとともに、土圧によって大きな曲げ応力が加わった際にもシール性を確保しながら接続部の損傷を回避することができるリブパイプの接続構造を提供することを目的としている。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明のリブパイプの接続構造は、受口内にリブパイプ先端の差口を挿入し、該差口に設けられた複数のリブの内の一対のリブ間にシールリングを嵌着したリブパイプの接続構造において、前記シールリングを嵌着する一対のリブの外径を、差口以外に設けられたリブと同一外径に形成するとともに、シールリングを嵌着する一対のリブ以外の差口に設けられたリブの外径を、前記受口の内径よりも小さく、かつ、差口以外に設けられたリブの外径よりも小さく形成したことを特徴としている。
【０００６】
【発明の実施の形態】
図１及び図２は、本発明のリブパイプの接続構造の一形態例を示すもので、図１は受口及び差口の軸線を合わせて接続した状態を示す一部断面図、図２は受口と差口とを角度を付けて接続した状態を示す要部の断面図である。
【０００７】
本形態例に示す接続構造は、リブパイプ１１の受口１２に、同口径のエルボタイプのリブパイプ２１の差口２２を嵌入して接続するものであって、前記受口１２の内径は、従来の受口と同様に、リブパイプ１１，２１の外周に設けられているリブＲ０の外径より僅かに大きな寸法に設定されている。
【０００８】
一方、前記差口２２は、その外周に設けられている４本のリブＲ１，Ｒ２，Ｒ３，Ｒ４の内、シールリング３１を嵌着するための環状溝を形成する一対のリブＲ２，Ｒ３の外径を、差口以外に設けられたリブＲ０と同一の外径とし、その両側のリブＲ１，Ｒ４の外径を、前記リブＲ０及びリブＲ２，Ｒ３の外径より小さくして受口１２の内径よりも小さく形成している。
【０００９】
すなわち、本形態例では、差口２２の外周に形成されている４本のリブＲ１，Ｒ２，Ｒ３，Ｒ４の内、両側の２本のリブＲ１，Ｒ４の外径を受口１２の内径よりも小さく、かつ、差口以外に設けられたリブ０の外径よりも小さく形成しており、内側の２本のリブＲ２，Ｒ３の外径を通常のリブＲ０と同じに形成している。
【００１０】
このように形成することにより、両側の２本のリブＲ１，Ｒ４の外周縁と受口１２内面との間に適度な隙間が形成されることになるので、この隙間に相当する分だけ、受口１２と差口２２との接続角度を調節することが可能となり、図２に示すように、適当な角度で両リブパイプ１１，２１を接続することができる。
【００１１】
また、図１に示すように直線状に接続した場合であって、地震等によって強い土圧が作用して、リブパイプの接続角度に影響を与えるような場合でも、上記構造の受口１２と差口２２とによる接続部分で吸収することができ、リブパイプ１１，２１や受口１２、差口２２の破損を回避することができる。
【００１２】
なお、シールリング３１を嵌着する部分のリブの外径を小さくしてもよいが、差口以外のリブＲ０と同一に形成しておくことにより、従来と同じシールリング３１を同じ状態で嵌着することができ、所定のシール性を確実に得ることができる。このとき、シールリング３１の両側のリブＲ２，Ｒ３の外径を、リブＲ０より若干小さくしておくことによって角度調節をスムーズに行えるが、差口２２を受口１２に挿入するときにシールリング３１がリブＲ３を乗り越えてしまうことを防止するためには、リブＲ３の外径をリブＲ０と同一に形成しておけばよい。
【００１３】
また、シールリング３１の嵌着位置は、本形態例では、リブＲ２，Ｒ３に挟まれた２番目の溝部分としたが、リブＲ１，Ｒ２の間の１番目の溝部分でもよく、３番目以降の溝部分であってもよい。さらに、差口２２の外周に設けられるリブの本数は、差口２２の長さ、パイプ口径、リブ間隔、所要の接続強度等の条件によって異なる。
【００１４】
そして、差口２２に形成するリブは、シールリング３１を嵌着した位置に応じてそれぞれ外径を設定すればよく、また、それぞれのリブを同一外径としてもよいが、シールリング３１に遠い位置のリブの外径は小さくしておき、シールリング３１に近いリブの外径は比較的大きくしておいてもよい。例えば、差口外周に５本のリブがあって１番目の溝内にシールリングを嵌着する場合は、１番目と２番目のリブの外径を差口以外のリブの外径と同一としておき、５番目のリブの外径を該リブパイプの溝部分の外径と同じかそれよりも僅かに大きくし、３番目と４番目のリブは、１，２番目のリブの外径と５番目のリブの外径との間の外径で、３番目のリブの外径が４番目のリブの外径よりも大き目になるように設定すればよい。
【００１５】
【発明の効果】
以上説明したように、本発明のリブパイプの接続構造によれば、リブパイプ同士を接続する際に角度調節を行うことができ、また、土圧等が作用しても接続部分で吸収することができるので、リブパイプの破損を回避することができる。
【図面の簡単な説明】
【図１】本発明のリブパイプの接続構造の一形態例を示すもので、受口及び差口の軸線を合わせて接続した状態を示す一部断面図である。
【図２】受口と差口とを角度を付けて接続した状態を示す要部の断面図である。
【符号の説明】
１１…リブパイプ、１２…受口、２１…リブパイプ、２２…差口、３１…シールリング、Ｒ０，Ｒ１，Ｒ２，Ｒ３，Ｒ４…リブ[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a rib pipe connection structure, and more specifically, a seal ring in which an insertion port formed at the other rib pipe end is inserted into a receiving port formed at one rib pipe end, and is fitted to the outer periphery of the insertion port. The present invention relates to a rib pipe connection structure that seals a connection portion.
[0002]
[Prior art]
As a connection structure for connecting the rib pipes, for example, a structure described in Japanese Utility Model Publication No. 7-35188 is known. In this connection structure, a seal ring is fitted between a pair of ribs provided in a portion serving as a gap, and in this state, the gap is fitted into the receptacle, thereby connecting both rib pipes and the seal ring. A predetermined sealing property is obtained.
[0003]
[Problems to be solved by the invention]
However, in the conventional connection structure, the plurality of ribs provided on the outer periphery of the opening are formed in the same shape as the ribs provided other than the opening, and the outer diameter thereof is larger than the inner diameter of the receiving opening. It is only slightly smaller. Therefore, when the rib pipes are connected to each other, the rib outer periphery and the inner surface of the receiving port are almost in contact with each other, so that the rib pipes are connected on the same straight line. It was difficult to adjust the connection angle. In addition, if earth stress such as an earthquake acts strongly when buried underground and bending stress is applied to the connection part, the ribs are pressed against the inner surface of the receiving port with a strong force, which may damage the receiving port. It was.
[0004]
Therefore, the present invention enables the adjustment of the angle when connecting the rib pipes, and the rib pipe that can avoid the damage of the connecting portion while ensuring the sealing performance even when a large bending stress is applied by the earth pressure. It aims to provide a connection structure.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the rib pipe connection structure according to the present invention is such that a rib pipe tip end is inserted into a receiving port, and a seal ring is fitted between a pair of ribs provided in the rib. In the connection structure of the attached rib pipe, the outer diameter of the pair of ribs to which the seal ring is fitted is formed to have the same outer diameter as that of the ribs provided other than the opening, and other than the pair of ribs to which the seal ring is fitted. The outer diameter of the rib provided in the other opening is smaller than the inner diameter of the receiving opening, and smaller than the outer diameter of the rib provided other than the opening.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an example of a rib pipe connection structure according to the present invention. FIG. 1 is a partial sectional view showing a state in which the axes of the receiving port and the connecting port are connected together, and FIG. It is sectional drawing of the principal part which shows the state which connected the opening and the opening at an angle.
[0007]
The connection structure shown in the present embodiment is such that an insertion port 22 of an elbow-type rib pipe 21 having the same diameter is inserted into and connected to the receiving port 12 of the rib pipe 11, and the inner diameter of the receiving port 12 is the conventional one. Similar to the receiving port, the dimension is set to be slightly larger than the outer diameter of the rib R0 provided on the outer periphery of the rib pipes 11 and 21.
[0008]
On the other hand, the differential port 22 is formed of a pair of ribs R2 and R3 forming an annular groove for fitting the seal ring 31 out of the four ribs R1, R2, R3 and R4 provided on the outer periphery thereof. The outer diameter of the rib R0 is the same as that of the rib R0 provided at other than the outlet, and the outer diameters of the ribs R1, R4 on both sides thereof are made smaller than the outer diameter of the rib R0 and the ribs R2, R3. It is formed smaller than the inner diameter.
[0009]
That is, in this embodiment, the outer diameters of the two ribs R1, R4 on both sides of the four ribs R1, R2, R3, R4 formed on the outer periphery of the differential port 22 are made larger than the inner diameter of the receiving port 12. Is smaller than the outer diameter of the rib 0 provided outside the slot, and the outer diameters of the two inner ribs R2 and R3 are the same as those of the normal rib R0.
[0010]
By forming in this way, an appropriate gap is formed between the outer peripheral edge of the two ribs R1 and R4 on both sides and the inner surface of the receiving port 12, and accordingly, the receiving portion corresponding to the gap is received. It is possible to adjust the connection angle between the port 12 and the difference port 22, and as shown in FIG. 2, the rib pipes 11 and 21 can be connected at an appropriate angle.
[0011]
In addition, even when a straight connection is made as shown in FIG. 1 and a strong earth pressure acts due to an earthquake or the like and affects the connection angle of the rib pipe, it is different from the receiving port 12 of the above structure. It can absorb in the connection part by the opening | mouth 22, and the failure | damage of the rib pipes 11 and 21, the receiving port 12, and the differential port 22 can be avoided.
[0012]
In addition, although the outer diameter of the rib of the part to which the seal ring 31 is fitted may be reduced, the same seal ring 31 as that of the prior art is fitted in the same state by forming it in the same manner as the rib R0 other than the opening. It is possible to wear, and a predetermined sealing property can be obtained with certainty. At this time, the outer diameter of the ribs R2 and R3 on both sides of the seal ring 31 can be adjusted smoothly by making the outer diameter slightly smaller than the rib R0. However, when the insertion port 22 is inserted into the receiving port 12, the seal ring In order to prevent 31 from getting over the rib R3, the outer diameter of the rib R3 may be formed to be the same as that of the rib R0.
[0013]
In addition, in this embodiment, the fitting position of the seal ring 31 is the second groove portion sandwiched between the ribs R2 and R3, but may be the first groove portion between the ribs R1 and R2. Subsequent groove portions may be used. Furthermore, the number of ribs provided on the outer periphery of the outlet 22 varies depending on conditions such as the length of the outlet 22, the pipe diameter, the rib interval, and the required connection strength.
[0014]
And the rib formed in the differential port 22 should just set an outer diameter according to the position which fitted the seal ring 31, respectively, and although each rib may be made the same outer diameter, it is far from the seal ring 31. The outer diameter of the rib at the position may be small, and the outer diameter of the rib close to the seal ring 31 may be relatively large. For example, when there are five ribs on the outer periphery of the opening and the seal ring is fitted in the first groove, the outer diameters of the first and second ribs are the same as the outer diameters of the ribs other than the opening. The outer diameter of the fifth rib is the same as or slightly larger than the outer diameter of the groove portion of the rib pipe, and the third and fourth ribs are the same as the outer diameters of the first and second ribs. The outer diameter of the third rib may be set to be larger than the outer diameter of the fourth rib.
[0015]
【The invention's effect】
As described above, according to the rib pipe connection structure of the present invention, it is possible to adjust the angle when connecting the rib pipes, and even the earth pressure or the like can be absorbed by the connection portion. Therefore, damage to the rib pipe can be avoided.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing an example of a rib pipe connection structure according to the present invention, showing a state in which the axes of a receiving port and a connecting port are connected together.
FIG. 2 is a cross-sectional view of a main part showing a state in which a receiving port and a connecting port are connected at an angle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Rib pipe, 12 ... Receptacle, 21 ... Rib pipe, 22 ... Slot, 31 ... Seal ring, R0, R1, R2, R3, R4 ... Rib

Claims

In a rib pipe connection structure in which a rib pipe front end is inserted into a receiving port, and a seal ring is fitted between a pair of ribs of the plurality of ribs provided in the port, a pair for fitting the seal ring The outer diameter of the rib is formed to be the same outer diameter as that of the rib provided other than the insertion opening, and the outer diameter of the rib provided in the insertion opening other than the pair of ribs to which the seal ring is fitted is set to the receiving opening. The rib pipe connection structure is characterized in that it is smaller than the inner diameter of the rib and smaller than the outer diameter of the rib provided outside the slot.