JPH08333798A - Pipe body connecting structure - Google Patents

Abstract

PURPOSE: To facilitate fitting of a cover receiving frame to a cleanout connection pipe, height adjustment of the cover receiving frame, and the like by inclining the bottom face of an annular recessed groove, and making the groove width of the annular recessed groove larger than the width of an annular elastic body. CONSTITUTION: Annular elastic packing 5 is mounted in an annular recessed groove 45 of a cylindrical part 41 of a cover receiving frame 4. The cylindrical part 41 is then pushed in and inserted into an upper end part opening 21 of a cleanout connection pipe 2. As the cylindrical part 41 is pushed in, the annular elastic packing 5 moves gradually upward along the inclined bottom face of the annular recessed groove 45 with the increase of frictional resistance to the upper end part inner peripheral surface 22 of the cleanout connection pipe 2. As a result, the annular elastic packing 5 sticks closely to the bottom face of the annular recesseed groove 45 so as to form watertight connection structure. In the case of needing to pull out the cover receiving frame 4 from the upper end part opening 21 of the cleanout connection pipe 2, the annular elastic packing 5 moves gradually downward along the inclined bottom face of the annular recessed groove 45. As a result, force required to pull out is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for pipes, for example, a connecting structure for a cleaning port pipe of a drainage basin and a cylindrical lid receiving frame.

[0002]

2. Description of the Related Art Conventionally, as a connection structure between a cleaning port pipe of a drainage basin and a lid receiving frame, for example, in Japanese Utility Model Laid-Open No. 4-119882, a cylindrical portion fitted to the cleaning port pipe and this cylindrical shape are provided. A cleaning port main body (corresponding to a cover receiving frame), which comprises a cover receiving part into which a lid is openably and closably fitted to a cleaning port having an enlarged diameter at the upper end of the upper part of the cylindrical part, There is described a connection structure in which an annular groove is formed on at least one of the peripheral surfaces, and an annular elastic packing which is in close contact with the peripheral surface of the cleaning port tube is fitted in the annular groove.

[0003]

In the above-mentioned conventional connecting structure of the cleaning port tube and the lid receiving frame, specifically, an annular packing having a circular cross section is fitted in an annular groove having a semicircular cross section. Since the groove width of the annular groove is almost the same as the width of the annular packing, the fitting force required to fit the cylindrical portion into the cleaning port tube and the pulling force for pulling out the cylindrical portion from the cleaning port tube are Are almost the same. Therefore, in order to increase the watertightness of the connection portion, the compression rate of the annular packing must be increased. However, on the contrary, since the fitting force and the pulling force increase, there is a problem that the work of attaching the lid receiving frame to the cleaning port tube and the work of adjusting the height of the lid receiving frame become difficult.

The present invention is intended to solve the above-mentioned conventional problems, and an object of the present invention is to reduce the water-tightness of the connecting portion, as compared with the fitting force of the cylindrical portion. An object of the present invention is to provide a connecting structure for a pipe body that can reduce the pulling force.

[0005]

According to a first aspect of the present invention, there is provided a connecting structure for a pipe body according to the first aspect of the present invention, wherein an inner peripheral surface of an end portion of the first pipe body or a second pipe body
An annular elastic body is attached to an annular groove formed on an outer peripheral surface of an end portion of the pipe body, an end portion of a second pipe body is inserted into an end portion of the first pipe body, and both pipe bodies are inserted into the annular groove groove. In a connection structure of pipes that are watertightly connected by an attached annular elastic body, the bottom surface of the annular groove is inclined, and the groove width of the annular groove is wider than the width of the annular elastic body. It has been done.

According to a second aspect of the present invention, there is provided a connection structure for a pipe according to the present invention, wherein the first pipe is a cleaning port pipe connected to a receiving portion projecting above the drainage basin buried in the ground. A cylindrical portion into which the second tubular body is inserted into the cleaning port tube; and a lid receiving portion into which a lid is openably and closably fitted to a cleaning port which is expanded in an upper end portion of the cylindrical portion and has an opening on an upper surface. It is a tubular-shaped lid receiving frame consisting of.

According to a third aspect of the present invention, there is provided a pipe connecting structure in which an annular groove is formed on an outer peripheral surface of a lower end portion of a cylindrical portion of a lid receiving frame, and a bottom surface of the annular groove is a cleaning port tube. 3. The invention according to claim 2, wherein the groove is inclined so as to become deeper toward the inner side.

Specific examples of the types of the first and second pipe bodies in the present invention include the following combinations. For example, when the first pipe is a cleaning port pipe connected to a receiving part provided in the upper part of a drainage basin buried in the ground and the second pipe is a tubular lid receiving frame, or vice versa. First, the first tubular body is a tubular lid receiving frame, and the second tubular body is a cleaning port tube. In addition, when the first pipe body is an inlet side receiving portion of the drainage basin and the second pipe body is a short tubular joint (for example, a joint for exchange) inserted and connected to the inlet side receiving portion, or vice versa. In addition, the first pipe body is a short tubular joint (for example, an exchange joint), and the second pipe body is an inlet side receiving portion of the drainage basin.

[0009]

In the connection structure for a pipe body according to the present invention as set forth in claims 1 to 3, the annular elastic body is attached to the annular concave groove whose bottom surface is inclined and whose groove width is wider than that of the annular elastic body. Therefore, for example, when the end of the second tubular body is pulled out from the end of the first tubular body, the annular elastic body moves along the inclined bottom surface of the annular concave groove in the direction opposite to the pulling-out direction. .
As a result, the compressibility of the annular elastic body becomes small and the pulling force becomes small.

On the other hand, when the end portion of the first tubular body is inserted into the end portion of the second tubular body, the annular elastic body moves along the inclined bottom surface of the annular groove in the direction opposite to the inserting direction. It will be. As a result, the compressibility of the annular elastic body is increased and the watertightness is improved. Therefore, for example, when the first tubular body is the cleaning port tube and the second tubular body is the tubular lid receiving frame, the pulling force required for adjusting the height of the lid receiving frame can be small.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pipe connecting structure of the present invention will be described below with reference to the drawings. (Embodiment 1) This is an example in which the first pipe body is a cleaning port pipe and the second pipe body is a lid receiving frame. FIG. 1 shows the use of the connection structure of the first pipe body and the second pipe body in the present invention. 2 is a schematic explanatory view showing a state, FIG. 2 is a front view showing a part of the lid receiving frame by cutting out, and FIG.
FIG. 4 is an enlarged sectional view showing an enlarged main portion of FIG. 4, and FIG. 4 is an enlarged sectional view showing an enlarged main portion of FIG.

In the figure, reference numeral 1 denotes a merge type sill main body, and receiving ports 11, 12, and 13 are provided at the ends thereof in an enlarged diameter. A receiving portion 14 is provided on the upper side of the sill body 1, a cylindrical cleaning port tube 2 is connected to the receiving port 14, and an upper end opening 21 of the cleaning port tube 2 is
The lower portion of the lid receiving frame 4 to which the lid 3 is fitted is inserted and connected. In addition, reference numerals 61, 62 and 63 are drainage pipes, which are connected to the receiving portion of the container body 1.

Specifically, as shown in FIG. 2, the lid receiving frame 4 has a cylindrical portion 41 that is inserted into the upper end opening 21 of the cleaning port tube 2 and an upper end portion of the cylindrical portion 41. A lid receiving portion 43 in which the lid 3 is fitted in a cleaning port 42 that is diametrically opened on the upper surface.
It consists of Two annular protrusions 44, 44 are integrally provided on the outer peripheral surface of the lower end portion of the cylindrical portion 41 so as to project outward, and the annular concave groove 4 having the groove width B is provided between the annular protrusions 44, 44.
5 is formed. An annular elastic packing 5 having a circular cross section is mounted in the annular groove 45.

The bottom surface 46 of the annular groove 45 is inclined downward, that is, the depth of the groove 45 is gradually increased downward. The bottom surface 46
The inclination degree and the width (or outer diameter) b of the annular elastic packing 5 are, as shown in FIG. 3, even if the annular elastic packing 5 exists at the deepest position of the concave groove 45, the annular elastic packing 5 is It may be appropriately set so that a certain compression rate is applied to the. In addition, the annular groove 4
The groove width B of the groove 5 is about twice the width b of the annular elastic packing 5, as shown in FIG.

Then, the cylindrical portion 41 of the lid receiving frame 4 in which the annular elastic packing 5 is mounted in the annular recessed groove 45 is inserted into the upper end opening 21 of the cleaning port tube 2, and the inner periphery of the upper end part of the cleaning port tube 2 is inserted. The annular elastic packing 5 is in close contact with the surface and the outer peripheral surface of the lower end portion of the cylindrical portion 41 to form a watertight connection structure.

Next, the mode of use and operation of the above embodiment will be described. First, the annular elastic packing 5 is mounted in the annular concave groove 45 of the cylindrical portion 41 of the lid receiving frame 4. At that time, the annular elastic packing 5 is attached to the deepest portion of the groove. Next, the cylindrical portion 41 of the lid receiving frame 4 fitted with the annular elastic packing 5 is pushed into the upper end opening 21 of the cleaning port tube 2 and inserted. At this time, since the annular elastic packing 5 is mounted in the portion having the deepest groove depth, the compression rate of the annular elastic packing 5 is small. Therefore, the force at the initial stage required for pushing the upper end opening 21 can be small.

As it is pushed in, the annular elastic packing 5 gradually increases along the inclined bottom surface 46 of the annular groove 45 as the frictional resistance with the inner peripheral surface 22 of the upper end portion of the cleaning port tube 2 increases. Move upwards. As a result, the inner peripheral surface 22 of the upper end portion of the cleaning port tube 2 and the cylindrical portion 4
The ring-shaped elastic packing 5 is in close contact with the outer peripheral surface of the lower end portion 1, that is, the bottom surface of the ring-shaped groove 45 to form a watertight connection structure.

Further, it is necessary to adjust the height of the lid receiving frame 4, so that the lid receiving frame 4 is attached to the upper end opening 2 of the cleaning port tube 2.
When it is necessary to pull out a little from the inside of 1, the annular elastic packing 5 is inserted into the annular concave groove 4 contrary to the case of the above pushing.
5 will gradually move downward along the inclined bottom surface 46 of FIG. As a result, the force required for extraction is reduced.

(Second Embodiment) Contrary to the first embodiment, the first
This is an example in which the tubular body is a lid receiving frame and the second tubular body is a cleaning port. FIG. 5 is a front vertical cross-sectional view showing the lid receiving frame, and FIG. 6 is an enlarged cross-sectional view showing an enlarged main part of FIG. FIG. 7 and FIG. 7 are cross-sectional views showing a usage state of the lid receiving frame of FIG.

More specifically, as shown in FIG. 5, the lid receiving frame 4a has a cylindrical portion 41a which is fitted on the outer periphery 21a of the upper end portion of the cleaning port tube 2a, and has a diameter enlarged at the upper end portion of the cylindrical portion 41a. And a lid receiving portion 43a into which the lid 3a is fitted in the cleaning port 42a opened on the upper surface. And the cylindrical portion 4
The inner peripheral surface of the lower end portion of 1a has two annular protrusions 44a inwardly,
44a is integrally formed with the annular protrusions 44a, 44a.
An annular recessed groove 45a having a groove width B is formed therebetween. An annular elastic packing 5a having a circular cross section is mounted in the annular groove 45a.

The bottom surface 46a of the annular groove 45a is inclined downward, that is, the groove 45 downward.
The depth of a is gradually increased. The degree of inclination of the bottom surface 46a and the annular elastic packing 5a
The width (or outer diameter) b of the groove is appropriately set such that even if the annular elastic packing 5a exists at the deepest position of the concave groove 45a, the annular elastic packing 5a is loaded with a certain compression rate. Just set it. In addition, the annular groove 45
The groove width B of a is approximately twice the width b of the annular elastic packing 5a, as shown in FIG.

Then, the cylindrical portion 41a of the lid receiving frame 4a, in which the annular elastic packing 5a is fitted in the annular groove 45a, is externally inserted to the outer periphery of the upper end portion of the cleaning port tube 2a, and the outer peripheral surface of the upper end of the cleaning port tube 2a and An annular elastic packing 5a is in close contact with the inner peripheral surface of the lower end of the cylindrical portion 41a to form a watertight connection structure. Note that the use mode and operation of the second embodiment are almost the same as those shown in the first embodiment, and therefore the description thereof will be omitted.

[0023]

According to the pipe connecting structure of the present invention as set forth in claims 1 to 3, an annular groove is formed on the inner peripheral surface of the end of the first pipe or the outer peripheral surface of the end of the second pipe. The annular elastic body is attached, and the end of the second pipe is inserted into the end of the first pipe,
In a pipe connecting structure in which both pipes are connected in a watertight manner, the bottom surface of the annular groove is inclined, and moreover, the groove width of the annular groove is made wider than the width of the annular elastic body. For example, when the end portion of the second tubular body is pulled out from the end portion of the first tubular body, the annular elastic body moves along the inclined bottom surface of the annular groove in the direction opposite to the pulling direction, while When the end of the first tubular body is inserted into the end of the second tubular body, the annular elastic body moves along the inclined bottom surface of the annular groove in the direction opposite to the insertion direction. , At the time of pulling out, the compressibility of the annular elastic body becomes small, and the pulling force becomes small,
On the contrary, when inserted, the compressibility of the annular elastic body is increased and the watertightness is improved. Therefore, it is possible to easily attach the lid receiving frame to the cleaning port tube and adjust the height of the lid receiving frame.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing a usage state of a connection structure of a first tubular body and a second tubular body in the present invention.

FIG. 2 is a front view showing an example of a lid receiving frame with a part cut away.

FIG. 3 is an enlarged cross-sectional view showing an enlarged main part of FIG.

FIG. 4 is an enlarged cross-sectional view showing an enlarged main part of FIG.

FIG. 5 is a front vertical cross-sectional view showing another example of the lid receiving frame.

FIG. 6 is an enlarged cross-sectional view showing an enlarged main part of FIG.

FIG. 7 is a cross-sectional view showing a usage state of the lid receiving frame of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Masu main body 2 Cleaning mouth pipe (1st pipe body) 2a Cleaning mouth pipe (2nd pipe body) 3, 3a Lid 4 Lid receiving frame (2nd pipe body) 4a Lid receiving frame (1st pipe body) 41, 41a Cylindrical portion 45, 45a annular groove 46, 46a bottom surface of annular groove 5, 5a annular elastic packing B groove width of annular groove b width of annular elastic packing (outer diameter)

Claims (3)

[Claims] 1. An annular elastic body is attached to an annular groove formed in an inner peripheral surface of an end portion of a first pipe body or an outer peripheral surface of an end portion of a second pipe body, and a second pipe is attached to an end portion of the first pipe body. In the connection structure of the tube body in which the end portion of the body is inserted and both tube bodies are watertightly connected by the annular elastic body mounted in the annular groove, the bottom surface of the annular groove is inclined, Further, the connecting structure of the pipe body is characterized in that the groove width of the annular concave groove is made wider than the width of the annular elastic body. 2. The first pipe body is a cleaning port pipe connected to a receptacle part projecting above the drainage basin buried in the ground, and the second pipe body is inserted into the cleaning port pipe. A cylindrical lid receiving frame including a cylindrical portion and a lid receiving portion that has a diameter enlarged at the upper end of the cylindrical portion and a lid that is openably and closably fitted to a cleaning opening that opens on the upper surface. The connection structure for a pipe according to claim 1. 3. An annular groove is formed on the outer peripheral surface of the lower end portion of the cylindrical portion of the lid receiving frame, and the bottom surface of the annular groove has a deeper depth toward the inner side of the cleaning port tube. The connection structure for a pipe body according to claim 2, wherein the connection structure is inclined so that