JPS5856471Y2 - Water pipe connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for connecting a water distribution pipe to a water main.

In this type of conventional water pipe connection device, a member (saddle) that is integrally connected to the base of the water pipe and has an arc shape when viewed in the direction of the main pipe axis is connected to the main water pipe on its inner surface. The band is placed in contact with the outer surface of the main pipe around the branch hole formed in the pipe, and the tightening band is connected to the band through the bolt, which is wrapped around the outer surface of the main pipe. In the conventional method, the annular backing interposed between the inner surface of the arc-shaped member and the outer surface of the main pipe is pressed around the branch hole by tension from the circumferential direction of the pipe to ensure water retention. The contact pressing force of the backing against the outer surface of the pipe in the radial direction of the main pipe is not the main force because the band tightening from the circumferential direction of the main pipe is not the entire tensile force but a partial force. If uneven distortion exists on the outer surface of the pipe, even if the tightening band is further tightened and the tightening tension is increased, the contact pressing force may be insufficient as a whole, or backing may occur around the branch hole of the main pipe. At local positions in the circumferential direction, uniform contact pressure cannot be obtained due to unevenness and strain on the outer surface of the main pipe, and therefore, there is a drawback that water leakage defects are likely to occur.

In view of the above-mentioned drawbacks, the purpose of the present invention is to provide a water pipe connecting device that ensures uniform backing contact pressure and complete watertightness even when there are some irregularities and distortions on the outer surface of the main pipe. shall be.

The technical means taken to achieve this objective is to attach an annular flange to the base of the water pipe or the water pipe to which it can be connected, which corresponds to the outer surface of the pipe around the branch hole drilled in the main water pipe. An annular backing is formed integrally with the inner surface of the flange portion and an outer surface of the pipe around the branch hole opposing thereto, and overlaps with the outer surface of the annular flange portion and is attached to the outer periphery of the main pipe. The tightening is performed by providing a member having an arc shape when viewed in the direction of the pipe axis, which presses this annular flange portion toward the outer surface of the main pipe by a tensile force from the pipe circumferential direction between the band and the band. A plurality of screws for pressing the annular backing via the annular flange are screwed into the overlapping portion of the arc-shaped member with respect to the annular flange.

According to this, the annular flange is pressed toward the outer surface of the main pipe by a tensile force applied between the arcuate member and the band from the circumferential direction of the pipe, and the inner surface of the annular flange is pressed against the inner surface of the annular flange. The annular backing interposed between the outer surface of the main pipe around the branch hole is pressed, and independent of this pressing action, the annular flange section is permanently moved by the pressing force of the plurality of screws screwed into the arc-shaped member. The annular backing is pressed against the outer surface of the main pipe, and the annular backing interposed between the annular flange and the outer surface of the pipe around the branch hole is pressed against the outer surface of the main pipe. This pressing action is caused by the tension component due to the tightening of the band, and
Since the tightening is a combination of both the direct pressing force by the screw and the mutually independent effects, the tightening can ensure a strong overall backing contact pressing force in the radial direction of the main pipe due to the tightening of the band, and Even if there is uneven distortion on the outer surface of the main pipe, the contact pressing force of the backing against the outer surface of the pipe can be made uniform over the entire circumference by finely adjusting the screw screwed near the part. This allows the water pipe or water stop to be connected to the main water pipe while ensuring complete water content.

Moreover, since the screw presses and adjusts the backing via the annular flange portion, no twisting force is applied to the backing itself, and the elastic pressing action of the backing can be maintained over a long period of time.

Hereinafter, embodiments of the present invention will be described based on the drawings.

At a location corresponding to the branch hole 1a drilled in the water main pipe 1 in the pipe axis direction, the two tightening bands wound around the outer circumference of the main pipe 1 are attached to both ends of the bands 2, 2 in the circumferential direction. , brackets 2a, 2a... are welded, while the water distribution pipe 3
The arcuate direction of the member 4, which has an arcuate shape when viewed from the main axis axis direction, overlaps the outer surface of the annular flange portion 3a integrally formed at the base of the water mouthpiece 3A. A pair of brackets 4a, 4a, . The brackets 4a, 4a, .
T-shaped bolts 5, 5 are used to tighten the brackets 2a, 2a, etc. on the side of the band 2, which are located opposite to each other in the circumferential direction of the main pipe.
It is impossible to press the bands 2, 2 and the arcuate member 4 against the outer surface of the main pipe 1 by inserting them in common and screwing and tightening the nuts 6, 6, etc. into these.

An annular backing 7 is interposed between the inner surface of the annular flange portion 3a and the outer surface of the main pipe 1 around the branch hole 1a facing the annular backing 7, which is fitted and held in an annular shape 3b formed on the inner surface of the flange portion 3a. At the same time, screws 8 whose tips can come into contact with the outer surface of the annular flange part 3a are located at multiple positions corresponding to the circumferential direction of the water distribution pipe 3 at four positions of the arc-shaped member facing the annular flange part 3a. Screw it in parallel to the three axes of the water distribution pipe.

In addition, 3C and 4b are the water diversion caps 3 for circumferential position regulation.
These are a protrusion protruding from A and a recessed groove formed in the arc-shaped member 4 into which the protrusion is fitted.

By fastening the band 2゜2 and the arcuate member 4 to the outer surface of the main pipe 1 by tightening the nuts 1-6, 6...
The annular flange portion 3a is pressed and moved toward the outer surface of the main pipe 1 using a component force in the radial direction of the main pipe of the tensile force acting at this time from the circumferential direction of the main pipe, and the annular backing 7 is pressed and the main pipe is 1 and the inner surface of the flange portion 3a, and further, by tightening the plurality of screws 8, the flange portion 3a is directly pressed and moved approximately along the radial direction of the main pipe 1. This applies direct pressure to the outer surface of the main pipe 1 to the backing 7, thereby further increasing the water tightness between the outer surface of the main pipe 1 and the flange portion 3a via the backing 7.

Therefore, in the case where there is a recessed mold 1b on the outer surface of the main pipe 1 around the branch hole 1a as shown in FIG. Even if multiple screws 8 tend to be defective,
... by adjusting the flange portion 3a against the arc-shaped member 4 that is in contact with the outer surface of the main pipe 1 and cannot move further inward in the radial direction of the main pipe 1. While the main pipe 1 is forcibly moved inward in the radial direction, the backing 7 can be tightly and firmly pressed against the outer surface of the main pipe 1, including the recessed mold 1b, over its entire circumference. .

The same applies when the outer surface of the main pipe 1 has a convex shape.

Incidentally, the annular flange portion 3a may be formed directly and integrally with the base of the water distribution pipe 3, as shown in FIG.

Furthermore, the axis of each screw 8 may be configured to face the axis of the main pipe 1.

[Brief explanation of the drawing]

The drawings show an embodiment of the water distribution pipe connection device according to the present invention, in which Fig. 1 is a side view, Fig. 2 is a front view, Fig. 3 is an enlarged longitudinal sectional side view of the main part, and Fig. 4 is an enlarged front view of the main part. , FIG. 5 is a longitudinal sectional side view showing the operating state, and FIG. 6 is a longitudinal sectional side view of the main part according to another embodiment. 1... Main pipe, 1a... Branch hole, 2... Tightening band, 3... Diversion pipe, 3A... Diversion cap, 3a... Annular flange portion, 4... Circle Arc-shaped member, 7... Annular backing, 8... Screw.

Claims (1)

[Scope of utility model registration request] At the base of the water distribution pipe 3 or the water distribution mouthpiece 3A to which this can be connected,
An annular flange part 3a corresponding to the outer surface of the pipe around the branch hole 1a bored in the main pipe 1 is integrally formed, and this flange part 3
An annular backing 7 is interposed between the inner surface of the pipe a and the outer surface of the pipe around the branch hole 1a facing thereto, and superimposed on the outer surface of the annular flange portion 3a, and
The annular flange portion 3 is tightened by a tensile force from the circumferential direction between the band 2 and the band 2.
A member 4 having an arc shape when viewed in the direction of the pipe axis is provided, and the annular flange portion 3 of this arc member 4 presses the outer surface of the main pipe 1.
A water distribution pipe connecting device in which a plurality of screws 8 for pressing the annular backing 7 through the annular flange portion 3a are screwed into the overlapping portion with respect to the annular backing 7.