JPS5811226A - Manufacture of regulating ring for manhole and product thereof - Google Patents

Abstract

PURPOSE:To make easier the manufacture of highly accurate regulating rings to be used for adjusting the depth of manholes by molding concrete into a regulating ring by using a framework having upper and lower frames integrally combined by connecting bars by a centrifugal molding method. CONSTITUTION:In manufacturing a regulating ring, three connecting bars 13 are erected on an upper frame 12 having an upwardly convexed ring 11 inside, and a ring sleeve 8 is thrust through the bars 3. Then, iron bars 4 are placed on the upper frame 12, a partition frame 15 having upwardly and downwardly concaved rings inside is thrust through the connecting bars 13 and its lower side is supported by the sleeve 8. In the same way, the ring sleeve 8 and the iron bars 4 are placed on the partition frame 15 and lastly a lower frame 16 having a downwardly convexed ring is placed, and the ends of the connecting bars 13 are clamped and fixed by nuts 17 to form a framework 18 to build up two regulating rings. The framework 18 thus obtained is inserted into a centrifugal molding frame and concrete is poured into the molding frame while turning it to form regulating rings of different height.

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.

More specifically, a ring sleeve with extremely smooth upper and lower surfaces and a through hole for a fixing bolt in the center is embedded in several places, and the end surfaces of this ring sleeve are exposed flush with the upper and lower surfaces, respectively, and the inner diameter is This invention relates to an adjustment ring for a manhole, which is formed with irregularities on a male part and a female part, respectively, and a method for manufacturing the adjustment ring, which has high precision (and can be mass-produced at one 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 1ia was molded with mortar by hand, 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 between the upper and lower surfaces with other members is poor, resulting in areas where the dimensions (flatness) of the contact surfaces are uneven. Therefore, stress concentration occurs due to partial contact with the concrete surface, which has the disadvantage of weakening 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 a further drawback that mutual misalignment occurred due to vibrations and the like.

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, there is a tubular metal ring sleeve 8 having a through hole 7 for a fixing bolt in the center so that its end surface is flush with the top surface 1 and bottom surface of the ring 6 (the top and bottom surfaces are exposed). Further, a concave female part 9 and a corresponding convex male part 10 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. The upper surface a and the lower surface of the ring 6 are completely flat and completely flush with both ends of the ring sleeve 8. Also, at the center of the outer periphery of the ring sleeve 8, there is a hole for cutting into the concrete body. A belt-shaped recess C for prevention is provided.

Next, to explain the method of manufacturing the adjustment ring 6 according to the present invention, in FIGS. Six connecting rods 16 are erected at equal intervals, the ring sleeve 8 is inserted into the connecting rods 13, the reinforcing bars 4 are placed on the upper frame 12, and then a partition having upper and lower inner concave rings 14 on the inner diameter is constructed. This partition plate 15 is inserted by inserting the frame 15 into the connecting rod 13.
The lower surface of the ring sleeve 8 is supported by the upper end surface of the ring sleeve 8, and then the ring sleeve 8 and reinforcing bars 4 are placed on the partition frame 15 in the same manner as described above, and finally the lower surface frame 1 having a downwardly convex ring is placed on the partition frame 15.
The frame body 181 is inserted into a 6tl series connecting rod 13, the lower surface of this lower frame 16 is supported by the sleeve 8, and the end of the connecting rod 15 is tightened and fixed with a nut 17 to form two adjustment rings. do. 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, when forming the i4mlJ cylinder 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 in the frame 18, and then the adjustment ring 6 is taken out from the mold 19 together with the frame 18, and the frame 18 around the adjustment ring 6 is disassembled to form two types of adjustment rings 6, respectively. It can be separated.

As mentioned 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, as shown in FIG. 11 (the male part 10 and the female part By meshing 9, the two can be easily laminated at a precise position, and the workability is extremely good.Moreover, it is possible to prevent 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 pole buried in the inclined wall pipe 21.
22JC 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 the upper and lower 1j
Since the adjustment ring 6 is formed uniformly on the lia and the lower surface, when the adjustment ring 6 is stacked, not only the concrete surface but also the end surface of this sleeve becomes the upper and lower contact surface. [The load 'X applied to the concrete part can be reduced, and therefore the adjustment ring 6
It has the characteristic of being able to significantly increase the withstand pressure of.

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 inserted into a centrifugal molding frame for forming tubes and centrifugally molded, the upper and lower surfaces of the adjustment ring are molded by the upper and lower frames, respectively, so that horizontal and smooth upper and lower surfaces can be obtained. Since the upper T' frame and the partition frame are supported at a distance 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 aligned. It is possible to mold extremely precise adjustment rings, 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 drawings]

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 2: Outer frame 4: Rebar 5.6: Adjustment ring 8 Ni sleeve 9: Female part 10: Male part 11, 14: Convex ring 12.16
: Upper and lower frames 13: Connecting rod 15: Partition frame 18:
Frame 19: Centrifugal formwork a, b: Upper and lower surfaces. Patent applicant: Haneda Huyum Tube Co., Ltd. Fig. 1 Fig. 2 Fig. 5 Fig. 6 Fig. 6] 4-, -13 1 1 Fig. 7 Fig. 8

Claims (2)

[Claims] (1) A frame body is constructed by connecting the upper frame and the lower frame with a connecting rod, inserting a ring sleeve having a through hole in the center through the connecting rod, and supporting the upper frame and the lower frame with the ring sleeve. A method for manufacturing an adjustment ring for a manhole, which includes the steps of: then inserting this frame into a centrifugal molding mold and molding the adjustment ring inside the frame by a centrifugal molding method. (2) Several ring sleeves with through holes in the center are buried in the vertical direction, and both four sides of the ring sleeves are exposed so as to be flush with the top and bottom surfaces, respectively, and the female part and the male part are in the inner diameter part. An adjustment ring for manholes that is characterized by an uneven surface.