JPH0643599Y2 - Branch pipe joint for concrete pipe - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a joint for a branch pipe for concrete pipe.

b. Conventional technology For concrete main pipes used for sewer pipes, etc.
When connecting a branch pipe such as a vinyl chloride pipe later, a joint is generally used as shown in FIG.

This joint is one in which a plate 102 curved in an arc shape along the outer periphery of a concrete main pipe 101 is attached to the tip of a joint pipe body 100 for mounting a branch pipe. A bond or mortar is applied to the periphery of the opening hole (not shown) in FIG. At this time, both sides of the plate 102 are bound to the concrete main pipe 101 by the number lines 103.

However, when the plate 102 was tied up by the number wire 103, it was necessary to dig up to the lower part of the concrete main pipe 101, which was troublesome.

Therefore, as shown in FIG. 8, a flanged rubber ring 106 made of soft rubber is attached to the tip of the joint core tube 105 to which the branch pipe 104 is attached, and the flanged rubber ring 106 is attached to the concrete main pipe 101. Opening hole
It is press-fitted and attached to 107. The collar 108 of the rubber ring 106 with a collar is curved along the outer surface of the concrete main pipe 101,
The flange 108 is in close contact with the outer surface of the concrete main pipe 101 to lock the flanged rubber ring 106.

c. Problem to be Solved by the Invention However, since the angle between the curved surface of the collar 108 of the flanged rubber ring 106 and the curved surface of the outer peripheral surface of the concrete main pipe 101 is different, the diameter of the concrete main pipe 101 is different from that of the flange 108. There is a problem that a gap is created between the main pipe 101 and the concrete, and as a result, the angle of the core pipe 105 changes due to the earth pressure during backfilling, and the mounting angle of the branch pipe 104 changes.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a joint for a branch pipe for a concrete pipe that can be applied to concrete pipes having different diameters and that can reliably attach the branch pipe.

d. Means for Solving the Problems In order to solve the above problems, the present invention provides a concrete pipe branch pipe joint for connecting a branch pipe to a side surface of a concrete main pipe, wherein A flanged cylinder provided on the outer peripheral surface of the front end of the core tube, a rear end of the flanged cylinder being attached to the core tube and a side opening hole of the concrete main tube And a gasket for connecting the flanged tubular body and the concrete main pipe to each other, and the flanged tubular body is attached to the outer peripheral surface of the tip portion of the core tube, and the outer peripheral surface of the tubular portion. And a flange portion formed along the circumferential direction so as to be curved substantially along the side shape of the concrete main pipe, and having an outer diameter smaller than the diameter of the side opening hole of the concrete main pipe. The corresponding of this flange part Provided location, lies in the structure and a pair of tongue pieces to be engaged with the outer peripheral surface of the concrete main projecting axially in the same direction of the concrete mains.

e. Action An opening hole for connecting a branch pipe is formed on the side of the concrete main pipe.

Next, the gasket part of the joint of the branch pipe for concrete pipe is press-fitted into the opening hole of the concrete main pipe. At this time, the flanged cylinder is attached so that the tongue piece of the flange portion is in the same direction as the axial direction of the concrete main pipe. In this way, the tongue piece is locked to the outer peripheral surface of the concrete main pipe to position the joint of the branch pipe. Further, since the flange portion has a smaller diameter than the opening hole of the concrete main pipe, the flange portion does not enter the opening hole and is not affected by earth pressure during backfilling.

f. Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 ab shows a branch pipe 3 such as a vinyl chloride pipe, polyethylene pipe, FRP pipe or the like connected to a concrete main pipe 1 having a diameter within a certain range, for example, 250φ to 800φ, by using a joint 2 of a concrete pipe branch pipe. It is sectional drawing which shows a state. In the figure,
An opening 4 having a predetermined diameter is formed on the side surface of the concrete main pipe 1. The joint 2 of the branch pipe for the concrete pipe has a core pipe 5 in which the branch pipe 3 is attached to the base end as shown in FIGS. 2 and 3.
And a flanged tubular body 6 provided on the outer peripheral surface of the tip portion of the core tube 5, and a soft member attached to the flanged tubular body 6 and having a rear end locked by a flange portion 7 of the flanged tubular body 6. It is composed of a rubber gasket 8.

The flanged tubular body 6 is provided with a tubular portion 6a mounted on the outer peripheral surface of the distal end portion of the core tube, and is curved along the outer peripheral surface of the tubular portion 6a so as to substantially follow the side surface shape of the concrete main pipe 1. And a flange portion 7 having an outer diameter smaller than the diameter of the side surface opening hole of the concrete main pipe 1 and provided at a corresponding position of the flange portion 7. It is composed of a pair of tongue pieces 9 protruding in the same direction as the axial direction of the main pipe 1 and locked to the outer peripheral surface of the concrete main pipe 1.

Reference numeral 10 is a reinforcing rib provided on the tongue piece 9. The flange portion 7 of the flanged tubular body 6 is formed in a curved shape so that both sides of the flange portion 7 center around the tongue piece 9 and draw a constant arc, for example, 300φ. It is formed so as to enter the inside of 4.

Next, the case where the branch pipe 3 is attached to the concrete main pipe 1 will be described with reference to FIGS.

First, an opening hole 4 having a predetermined diameter is formed on the side surface of the concrete main pipe 1. Then, the joint 2 of the branch pipe for concrete pipe is mounted in the opening hole 4.

For mounting the joint 2 of the branch pipe for concrete pipe, a pressing plate 12 having a through hole 11 in the center and a handle 13 are used. The handle 13 includes a rod 14 having a square screw thread cut off, an anchor 15 rotatably supported on the lower end of the rod 14, and an upper end threaded portion 16 of the rod 14 to rotate the rod 14 for rotation.
It consists of 17 and.

As shown in FIG. 4, the fitting procedure of the joint pipe 2 for the concrete pipe is such that the pressing plate 12 is arranged on the upper surface of the joint pipe 2 for the concrete pipe, and the rod 14 is inserted into the through hole 11 of the pressing plate 12. Install the handle 13.

Next, as shown in FIG. 5, the anchor 15 of the handle 13 is locked to the inner surface of the concrete main pipe 1, and the handle body 17 is held and rotated. At this time, the tongue piece 9 of the tubular body 6 with the flange of the joint 2 of the branch pipe for the concrete pipe is the concrete main pipe 1
Arrange so that it is in the same direction as the axial direction of.

Then, as the handle body 17 rotates, the rod 14
Moves upward, and the gasket 8 mounting portion of the joint 2 of the branch pipe for concrete pipe is press-fitted into the opening hole 4 of the concrete main pipe 1 as shown in FIG. A waterproofing material is applied to the gasket 8 so as to make close contact with the concrete main pipe 1. At this time, the flanged cylinder 6 of the joint 2 of the branch pipe for concrete pipe
Since the flange portion 7 has a smaller diameter than the opening hole 4 of the concrete main pipe 1, the flange portion 7 enters the opening hole 4. On the other hand, the tongue piece 9 provided integrally with the flange portion 7 is locked to the outer peripheral surface of the concrete main pipe 1, so that the joint 2 of the branch pipe for concrete pipe does not enter the opening hole 4 any more.

When the fitting 2 of the branch pipe for the concrete pipe is completed, the handle main body 17 is rotated in the opposite direction to the above, the rod 14 is lowered, and the engagement of the anchor 15 is released. Engagement and disengagement of the anchor 15 can be performed from the gap of the pressing plate 12.

Then, the branch pipe 3 is attached to the joint 2 of the branch pipe for concrete pipe, and the connection is completed.

As the joint 2 of the branch pipe for the concrete pipe, various types such as a straight type, a free type or a Y type can be applied.

g. Effect of the Invention As described above, according to the joint for a branch pipe for a concrete pipe according to the present invention, a pair of tongues provided on the flanged cylinder engages with the outer peripheral surface of the concrete main pipe to form a flange. Since the flange portion of the tubular body only prevents the gasket from coming off, the flange portion is not affected by earth pressure due to backfilling work or the like. Since the curved portion of the flange portion of the flanged tubular body enters into the opening hole of the concrete main pipe, it can be applied to concrete main pipes having different diameters without matching the outer shape of the concrete main pipe. Since the branch pipe for the concrete pipe itself does not need to be subjected to any processing, there is no fear of damaging the branch pipe for the concrete pipe during connection work, and the workability is good.

[Brief description of drawings]

FIG. 1 ab shows an embodiment of a joint for a branch pipe for concrete pipe according to the present invention, a is a longitudinal sectional view, and b is AA of FIG. 1 a.
It is a line sectional view. 2 and 3 show a joint of the branch pipe for concrete pipe of FIG. 1, FIG. 2 is a perspective view, and FIG. 3 is a right side view of FIG. 4 to 6 are cross-sectional views showing the order of attaching the joints for the concrete pipe branch pipes, FIGS. 7 and 8 show the conventional joints for the concrete pipe branch pipes, and FIG. 7 is a perspective view. FIG. 8 is a sectional view. 1 ... Concrete main pipe, 2 ... Branch pipe joint for concrete pipe, 3 ... Branch pipe, 4 ... Opening hole, 5 ... Core pipe, 6 ... Flange cylinder, 7 ... Flange portion, 8 …… Gasket, 9 …… Tongue.

Claims (1)

[Scope of utility model registration request] 1. A joint for a branch pipe for concrete pipe for connecting a branch pipe to a side surface of a concrete main pipe, wherein a core pipe having a branch pipe attached to a base end thereof and a flange provided on an outer peripheral surface of a tip end portion of the core pipe. With the attached tubular body, the rear end is locked to the flange portion of the flanged tubular body to be attached to the core pipe, and at the same time, the flanged tubular body and the concrete main pipe are pressed into the side opening holes of the concrete main pipe. A gasket to be connected, the tubular body with the flange, the tubular portion to be mounted on the outer peripheral surface of the distal end portion of the core tube, and along the outer peripheral surface of the tubular portion so as to substantially follow the side surface shape of the concrete main pipe. A flange portion that is curved and protrudes along the circumferential direction and that has an outer diameter smaller than the diameter of the side opening hole of the concrete main pipe, and is provided at a corresponding position of the flange portion. With the axial direction of the main Joint concrete pipe branch pipe, characterized in that is constituted by a pair of tongues projecting in the direction is locked to the outer peripheral surface of the concrete main.