JPS5953411B2 - Manufacturing method of adjustment ring for manhole and its product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an adjustment ring used for adjusting the depth of a manhole, and a product thereof, and more specifically, the present invention relates to a method of manufacturing an adjustment ring used for adjusting the depth of a manhole, and more specifically, a ring having extremely smooth upper and lower surfaces and having through holes for fixing bolts. The ring sleeve 1 sleeve in the center is buried in several places, and the end surfaces of the ring sleeve are exposed flush from the upper and lower surfaces, respectively, and male portions corresponding to the upper and lower parts of the inner diameter, respectively,
The present invention relates to an adjustment ring for a manhole formed with unevenness on a female part, and a manufacturing method of the adjustment ring that allows the adjustment ring to be produced accurately and in large quantities at a time.

As shown in FIG. 1, the conventional manhole adjustment ring of this type consists of a cylindrical outer frame 2 and an inner frame 3 erected on a bottom frame 1, and reinforcing bars 4 inserted into these frames. The adjustment ring 5 for the manhole was formed by pouring concrete from the open opening at the top, but in this conventional method, the adjustment ring 5
It was difficult to make the upper surface a horizontal and smooth, and although the upper surface a was manually molded with mortar, it was difficult to obtain a product with good precision.

Therefore, when conventional adjustment rings are used in manholes, the contact between the stacked rings and the upper and lower surfaces with other members is poor, resulting in areas where the dimensions (flatness) of the contact surfaces are uneven. However, there was a drawback that stress concentration occurred due to partial contact with the concrete surface, which weakened the ring's pressure resistance.

Furthermore, because the reinforcing bars do not pass through the conventional adjustment rings in the vertical direction, their resistance to compressive force from above is weak, and since there are no uneven parts on the top and bottom surfaces, it is difficult to align them when stacking them. Moreover, there was also the drawback that mutual misalignment occurred due to vibration, etc.

The adjusting ring and the method for manufacturing the same according to the present invention relate to a completely new technology developed in view of the drawbacks of the prior art.

To specifically explain one embodiment of the adjustment ring of the present invention with reference to the drawings, in FIGS. 2 to 4, 6 is the adjustment ring of the present application, inside of which a reinforcing bar 4 is embedded, and At three equally spaced locations, a tubular metal ring sleeve 8 having a through hole 7 for a fixing bolt in the center is exposed such that its end surface is flush with the top surface a and the bottom surface of the ring 6, and is exposed in the vertical direction. Further, a concave female part 9 and a convex male part 10 corresponding to the concave female part 9 are formed in the upper and lower parts of the inner diameter of the adjustment ring 6 so as to be recessed or protrude from the upper and lower surfaces.

In particular, the upper surface a and the lower surface of the adjustment ring 6 of the present invention are completely flat and smooth on both ends of the ring sleeve 8.

Further, a belt-shaped recess C is bored in the center of the outer periphery of the ring sleeve 8 to prevent it from being pulled out into the concrete body.

Next, a method of manufacturing the adjustment ring 6 according to the present invention will be described. In FIGS. 5 to 10, an upper frame 12 having an upwardly convex ring 11 on the inner diameter is placed horizontally, and the upper frame 12 is placed horizontally. Three connecting rods 13 are erected at equal intervals, the ring sleeve 8 is inserted into the connecting rods 13, the reinforcing bar 4 is placed on the upper frame 12, and then upper and lower inner concave rings 14 are provided on the inner diameter. The partition frame 15 is inserted through the connecting rod 13, the lower surface of the partition plate 15 is supported by the upper end surface of the ring sleeve 8, and then the ring sleeve 8 and reinforcing bar 4 are attached to the partition frame 1 in the same manner as described above.
5 and has a downward convex ring at the end.
is inserted into the connecting rod 13, the lower surface of the lower frame 16 is supported by the sleeve 8, and the end of the connecting rod 13 is tightened and fixed with a nut 17 to form a frame 18 forming two adjustment rings. .

The above embodiment describes the frame 18 for molding one large and small adjustment ring, but the frame can be configured so that a large number of the same kind or a wide variety of different kinds can be molded. It is.

Furthermore, in forming the adjustment ring 6, the frame 18 constructed as described above is inserted into the centrifugal form 19 for forming humid pipes, and concrete is poured while rotating the form 19. The adjustment ring 6 is molded inside, and then the adjustment ring 6 is taken out from the mold 19 together with the frame 18,
By dismantling the frame 18 around the adjustment ring 6, the two types of adjustment rings 6 can be separated.

As described above, the adjustment ring according to the present invention has the male part 10 and the female part 9 formed on the inner diameter part, so when these parts are stacked, the male part 10 and the female part 9 are stacked as shown in FIG. By interlocking the two, it is possible to easily stack the two at a precise position, and the workability is extremely good. This also prevents misalignment due to vibrations, etc., and the ring sleeve 8 has a through hole 7 inside. Since the sleeve 8 is buried vertically through the hole 7, the fixing bolt 20 is inserted into the sleeve 8, and the fixing bolt 20 is inserted into the anchor bolt 22 buried in the inclined wall pipe 21. The sleeve 8 can be screwed together, and both end surfaces of the sleeve 8 are exposed on the upper and lower surfaces of the adjustment ring 6, respectively, and this upper surface a
The adjustment ring 6 is formed flush with the lower surface.
When laminated, not only the concrete surface but also the end face of this sleeve becomes the upper and lower contact surface, so this sleeve 6
This has the feature that it can strongly bear the overburden load and reduce the load applied to the concrete part, and therefore the withstand pressure of the adjustment ring 6 can be greatly increased.

As described above, the method for manufacturing an adjustment ring according to the present invention involves combining an upper frame, a lower frame, a partition frame, a connecting rod, etc., and inserting a ring sleeve into the connecting rod to construct a molding frame. Since the frame body is centrifugally molded by inserting it into a centrifugal molding frame for forming hume tubes, the upper and lower surfaces of the adjustment ring can be molded by the upper and lower frames, respectively, and extremely horizontal and smooth upper and lower surfaces can be obtained. Since the lower frame and the partition frame are supported at intervals by the sleeve inserted through the connecting rod, both end surfaces of the sleeve and the upper and lower surfaces of the adjustment ring can be easily and automatically molded to be flush with each other. Extremely precise adjustment rings can be molded, and by interposing a partition frame and changing the length of the sleeve, a large number of various adjustment rings can be manufactured in a single centrifugal molding process.
Moreover, since it utilizes a centrifugal molding method, unlike the conventional flat vibrating method, it has the advantage of being able to mass-produce extremely good adjusting rings of uniform quality at low cost.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams of the ring and its members of the present application, FIGS. 5 to 10 are explanatory diagrams showing the manufacturing process of the ring, and FIG. 11 is an explanatory diagram of the use of the ring. 1: Bottom frame 1.2: Outer frame, 4: Rebar, 5, 6: Adjustment ring, 8 sleeve, 9: Female part, 10: Male part, 11.1
4: Convex ring, 12.16: Upper and lower frame, 13: Connecting rod,
15: Partition frame, 18: Frame body, 19: Centrifugal formwork, a, l)
: Upper and lower surfaces.

Claims (1)

[Scope of Claims] 1. The upper frame and the lower frame are connected by a connecting rod, and a ring sleeve having a through hole in the center is inserted into the connecting rod, and the upper frame and the lower frame are supported by the ring sleeve. The present invention is characterized in that a frame is constructed, and then this frame is inserted into a centrifugal molding mold, and an adjustment ring is molded inside the frame by a centrifugal molding method. A method of manufacturing an adjustment ring for a manhole. 2 Several ring sleeves each having a through hole in the center are buried in the vertical direction, and both end surfaces of the ring sleeves are exposed so as to be flush with the upper and lower surfaces, respectively, and the female part and the male part are provided with irregularities on the inner diameter part. An adjustment ring for manholes characterized by the formation of a