JPH0210764Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a jig used to align and attach the inner wall surface of a manhole and the end surface of a bell mouth during construction work in which corrugated hard polyethylene pipes are buried underground.

Conventionally, corrugated rigid polyethylene pipes, which are lightweight, have high mechanical strength, and are highly flexible, have been widely used when burying electrical cables and communication cables underground in parks, schools, factories, housing complexes, roads, etc. It had been.

As shown in Figure 3, underground boxes such as manholes and handholes are installed in the middle of underground pipelines to facilitate work such as cable entry, connection, inspection, and maintenance. Ta. At the end of the corrugated rigid polyethylene pipe installed in the manhole,
A bell mouth was screwed in to prevent damage when pulling in the cable and to finish the appearance.

However, in the hole drilled in the wall of the manhole,
When supporting a corrugated rigid polyethylene pipe, the larger the diameter and weight of the corrugated rigid polyethylene pipe, the more it tends to deviate from the core of the predetermined dimensions.

As shown in Figure 4, when the bell mouth is retracted from the inner wall of the manhole and is attached, the cable may be damaged by the corners of the concrete, or it may move vertically, horizontally, or vertically against the inner wall of the manhole. If the bell mouth was installed crooked, the bell mouth would protrude from the inner wall of the manhole, obstructing work inside the manhole, and often resulting in poor appearance.

Generally, bellmouths are installed by fixing a corrugated hard polyethylene pipe to the manhole with concrete and then screwing it in from the inside of the manhole.

However, when the corrugated hard polyethylene pipe is poured with concrete and allowed to cure, it sometimes deforms, and it is not easy to attach the bell mouth to the corrugated hard polyethylene pipe.

The present invention has been devised to eliminate the above-mentioned drawbacks, and one embodiment of the invention will be described with reference to the drawings. Attach body 2.

(b) Attach the support plate 3 to one end of the pipe 1.

(c) Attach the mandrel 4 having the male thread 5 to the center of the support plate 3.

Since the present invention has the above-described structure, when using it, as shown in FIG. Screw the mouse mounting jig A so as to pull it in from the end face of the bell mouth 7. The corrugated hard polyethylene pipe 6 is supported near the manhole 8 with stakes, rafters 16, etc., passed through the hole 11 of the manhole 8, and made of plywood, steel plate, etc., with an insertion hole 13 previously drilled so that the mandrel 4 passes through it. Bring the backing plate 12 into close contact with the inner wall surface 9 of the manhole 8, pass the mandrel 4 through the insertion hole 13, put the washer 15 and nut 14 on the male screw 5, and tighten the nut 14 so that the bell mouth 7 comes into close contact with the backing plate 12. tighten. On the outer wall surface 10 of the hole 11 of the manhole 8,
A temporary frame 17 made of boards, plywood, etc. is installed, and concrete is poured. After the curing period, if the backing plate 12 and bell mouth mounting jig A attached to the inner wall surface 9 of the manhole 8 are turned back and removed,
As shown in FIG. 8, the end surface of the bell mouth 7 is aligned with the inner wall surface 9 of the manhole 8, does not retract or protrude, has a beautiful external finish, and has the bell mouth at a position with predetermined dimensions. 7 can be fixed.

As shown in FIG. 2, the same effect can be obtained even if the spiral body 2 of the present invention is intermittently attached to the outer circumference of the tube 1.

Further, in the present invention, the spiral body 2 is wound around the tube 1 and attached, and the support plate 3 and the mandrel 4 are attached, but it is also possible to form the tube as an integral body using a mold.

Further, if the supporting plate 3 and the mandrel 4 have a certain degree of strength, they can be manufactured by plastic molding.

In the present invention, the mandrel 4 is attached to the center of the support plate 3, and the nut 14 is attached to the male thread 5 of the mandrel 4 and tightened. The bolt may be tightened by attaching a nut 14 to the back side of the opening.

With this invention, the bell mouth can be fixed in the manhole at a position with predetermined dimensions, and the inner wall surface of the manhole and the end face of the bell mouth can be easily and accurately matched, so that the end face of the bell mouth can be fixed inside the manhole. It does not retract or protrude from the wall at all, and can be fixed with a beautiful exterior finish.

Even if multiple corrugated rigid polyethylene pipes are installed in a manhole, the bell mouth will not protrude into the manhole at all, so work such as cable entry, connection, inspection, and maintenance of underground conduits can be carried out within the narrow manhole. It never gets in the way.

Therefore, in the construction work of burying corrugated hard polyethylene pipes, the present invention allows the bell mouth to be installed in the manhole with the specified dimensions accurately, and with the end face of the bell mouth aligned with the inner wall surface of the manhole, making it easy to connect the cable after installation. It is a great idea that does not cause any damage to the cable when pulling it, has a beautiful exterior finish, and does not get in the way during work such as connection, inspection, and maintenance inside the manhole.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the present invention. Figure 2 shows
FIG. 3 is a perspective view showing a second embodiment of the present invention. FIG. 3 is a front view and longitudinal sectional view showing how a corrugated hard polyethylene pipe and a bell mouth are attached to a conventional manhole. FIG. 4 is a front view and longitudinal cross-sectional view showing the main parts of a conventional bell mouth in a poor mounting state. FIG. 5 is a front view and longitudinal cross-sectional view showing the state of use of the present invention. FIG. 6 is an exploded perspective view of the present invention in use. FIG. 7 is a perspective view showing the construction method for the outside of the manhole according to the present invention. FIG. 8 is a front view and longitudinal cross-sectional view showing the main parts of a bell mouth attached to the wall of a manhole using the present invention. 1 is a tube, 2 is a spiral body, 3 is a support plate, 4 is a mandrel, 5 is a male thread, 6 is a corrugated hard polyethylene pipe,
7 is the bell mouth, 8 is the manhole, 9 is the inner wall,
10 is an outer wall surface, 11 is a hole, 12 is a backing plate, 13 is an insertion hole, 14 is a nut, 15 is a washer, 16 is a rafter, 17 is a temporary frame, and A is a bell mouth mounting jig.

Claims (1)

[Scope of utility model registration request] A bell characterized in that a spiral body 2 that can be screwed into a bell mouth 7 is attached to the outer periphery of a tube 1, a support plate 3 is provided at one end of the tube 1, and a mandrel 4 having a male thread 5 is attached. Mouse mounting jig.