JP4063627B2 - Metal tube joint for manhole installation formed with rubber ring - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a metal tube joint for attaching a manhole formed with a rubber ring.
[0002]
[Prior art]
Conventionally, the end of the water pipe was inserted into the side hole of the manhole from the outside by a propulsion method, open-cut method, etc., and the work of water sealing was performed by setting up a vertical shaft by surrounding the steel sheet pile outside the manhole. There is a tendency to perform in manholes for safety measures, traffic measures, and reduction of construction costs.
[0003]
[Problems to be solved by the invention]
However, the end of the flowing water pipe is not as designed, and is often misaligned from side to side and often reaches the side hole, so that there is a problem that it is not easy to fit into the side hole. In addition, there is a problem that it is difficult to perform water sealing by fastening the rubber ring end to the outer peripheral surface of the end of the flowing water pipe fitted inside the manhole and fastening it.
[0004]
[Means for Solving the Problems]
In the present invention, a side hole is formed on the side wall of a manhole with a spare gap extending on both sides to allow for the misalignment of the water pipe, and one or several rubber rings are circumferentially attached to the inner surface of the metal tube portion. made inner put for the formation of the metal tube joint having a metal mounting plate, after water flow pipe end to a side opening of the manhole is fitted with displacement cores to the left and right, with the inner and the metal tube joint from the inside of the side opening Then, the end of the water pipe is passed through the metal tube portion, and the rubber ring that is attached to the inner surface of the metal tube portion is crimped to the outer peripheral surface of the end of the water tube and sealed with water, and the side hole and the metal tube portion Such a problem is solved by closing the gap between the two by filling with a filler such as cement mortar .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 (a) and 1 (b), a metal tube 3 is welded and attached to the outside from a circular boring portion 2 of a metal mounting plate 1 for internal attachment. As shown in FIG. 2, one or several round steel rings 6 each consisting of two pairs parallel to the inner surface of the metal tube 3 are welded and attached to one or several pairs, and an adhesive is applied to the outer peripheral surface. A metal tube joint 8 with a rubber ring is formed by fitting the rubber ring 7 between the round steel rings 6 and bonding them.
[0006]
As shown in FIG. 3, after the flowing water pipe end 9 is fitted into the side hole 5 in the side hole 5 of the manhole 4, the metal tube joint 8 is fitted into the side hole 5 from the inside of the manhole 4 in the manner of passing the flowing water pipe end 9. The anchor bolt 10 is fixed and attached. As shown in FIG. 4, the side hole 5 is formed with preliminary gaps 5 a on the left and right sides, and the diameter of the metal tube 3 is larger than the diameter of the flowing water pipe end 9. As shown in c), even if the flowing water pipe end 9 is misaligned from the outside, the side surface hole 5 and the metal tube joint 8 can accept and fit them. Since the metal mounting plate 1 is formed with the vertically cracked groove 1a, even if the mounting position is slightly shifted from side to side, the metal mounting plate 1 can be closely attached following the R shape of the inner wall of the manhole 4. The metal cylinder 3 is fitted into the side hole 5, and the inner peripheral surface of the rubber ring 7 is pressed against the outer peripheral surface of the flowing water pipe end 9 to be water-sealed. In the figure, 11 is a filler such as cement mortar for closing the preliminary gap 5a, the gap between the metal tube 3 and the side hole 5, and 12 is a water-expandable sealant.
[0007]
6 to 7 show another example in which the length of the metal cylinder 3 is formed within the thickness of the side hole 4. In this way, the joint 8 can be attached without any trouble even when the outside of the manhole 4 is narrow and has no room. In addition to the linear shape, the round steel ring 6 and the rubber ring 7 may be circular as shown in FIG. 6 or may be attached by combining a linear shape and a circular shape as shown in FIG.
[0008]
【The invention's effect】
In the present invention, since a preliminary gap is provided on both sides of the side hole of the manhole, both the propulsion and excavation methods allow easy misalignment of the end of the water pipe without providing a shaft outside the manhole. In addition, since the metal tube joint is formed by surrounding the rubber ring on the inner surface of the metal tube portion in advance, it is possible to insert the joint from the inside of the manhole after being inserted into the side hole at the end of the water pipe. The rubber ring can be pressure-bonded to the end of the water pipe so that the work in the manhole is facilitated.
[0009]
In addition to bonding with an adhesive, the rubber ring is firmly attached to the inner surface of the metal cylinder by sandwiching the round steel ring, so that it does not peel off unnecessarily.
[Brief description of the drawings]
1A and 1B show an example of a metal tube joint of the present invention, in which FIG. 1A is a front view, FIG. 1B is a cross-sectional plan view, and FIG. 2A is a state before mounting a rubber ring. Fig. 3 (b) is a cross-sectional plan view showing a state where a rubber ring is sandwiched and attached in a round steel ring assembly. Fig. 3 is a cross-sectional view showing a state where the end of the water pipe reaches the side hole of the manhole. Fig. 4 (b) is a cross-sectional plan view of a metal tube joint fitted from the inside. Fig. 4 is a front view showing a side hole drilled in a manhole. Cross-sectional plan view showing the fitting attachment state of the metal tube joint when it is misaligned from side to side [Fig. 6] Cross-sectional plan view showing an example in which the length of the metal tube is formed within the wall thickness of the manhole [Fig. Cross-sectional plan view showing an example in which a steel ring and a rubber ring are provided in a combination of a linear shape and a circular shape. ]
Reference numeral 1 denotes a metal mounting plate 1a, a vertical crack groove 2, a circular boring portion 3, a metal cylinder 4, a manhole 5, a side hole 5a, a spare gap 6, a round steel ring 7, a rubber ring 8, a metal cylinder joint 9, and a water pipe The end 10 is an anchor bolt 11, the filler 12 is a water-expandable seal material

Claims (2)

A side hole is formed on the side wall of the manhole with a spare gap extending on both sides to allow misalignment of the water pipe, and one or several rubber rings are attached to the inner surface of the metal cylinder portion. of having a metallic mounting plate to form a metal tube fitting, after the water flow pipe end to a side opening of the manhole is fitted with displacement cores to the left and right, and with the inner the metal tube joint from the inside of the side hole, metal The end of the water pipe is passed through the tube portion, and a rubber ring that is attached to the inner surface of the metal tube portion is crimped to the outer peripheral surface of the end of the water tube and sealed with water , and the gap between the side hole and the metal tube portion A metal cylinder joint for manhole attachment formed with a rubber ring characterized in that is closed by filling with a filler such as cement mortar . The metal cylinder joint according to claim 1, wherein one or several rubber rings are fitted and bonded between round steel rings welded to the inner surface of the metal cylinder portion.

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