JPS62101720A - Fitting structure of bulking ring for outer cover of manhole - Google Patents

Abstract

PURPOSE:To exactly perform operations of construction by a method in which a bulking ring is connected with an existing manhole receiving frame by bonding, the lower hole of a screw hole is drilled, and the bulking ring is connected with the manhole cover receiving frame by connecting bolts. CONSTITUTION:A bulking ring 2 is connected with an existing manhole receiving frame 4 by bonding the ring 2 and the frame 4 whose bonding faces are coated with an adhesive, and a screw hole 36 is formed in the supporting face 18 of the frame 4. Bushes 42 are fitted to the bolt hole 28 and its large-diameter portion 32 of the ring 2, and the lower hole of the screw hole 36 is drilled. The ring 2 is connected with the frame 4 by connecting bolts 34. The threading process can thus be comparatively easily performed in exact positions, and the operations on site can be exactly and quickly made.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a manhole outer cover raising ring (hereinafter referred to as a height raising ring) that can quickly raise the height of a manhole outer cover receiving part without removing the existing manhole cover receiving frame during road raising work. (referred to as a ring).

Conventionally, this type of raising ring has a plurality of adjustment ribs protruding from the outer circumferential surface of the fitting part that fits into the outer cover receiving part of the existing manhole cover receiving frame. When fitting the adjustment lip into the outer cover holder, the tip of the adjustment lip is pressed against the inner circumferential surface of the outer cover holder to fix it and prevent rattling, and the protruding part protrudes from the outer periphery of the raising ring. Then, screw the bolt into this protrusion and bring the tip of the bolt into contact with the outer circumferential surface of the existing manhole cover frame through the hole dug around the existing manhole cover frame, and attach the raising ring to the existing manhole cover frame. Fixing methods have been proposed.

However, raising rings with adjustment ribs must be fitted by applying great pressure or impact, or the tip of the adjustment lip must be scraped little by little, which is a very troublesome process. There are drawbacks.

In addition, for the raising ring that is fixed to the existing manhole cover frame with bolts, holes must be dug in the paved surface around the protective manhole cover frame in order to allow the tip of the bolt to contact the outer circumferential surface of the existing manhole cover frame. , the work is troublesome. Moreover, since the tip of the bolt only contacts the outer circumferential surface of the existing manhole cover frame, there is a drawback that the fixation is incomplete.

Furthermore, the top end surface and outer cover holder of a manhole cover holder frame that has been used for a long period of time are subject to severe wear, and the flatness of the upper end surface and the inner diameter dimension of the outer cover holder may be greatly distorted. In such a conventional raising ring, a gap is created between the fitting part and the outer cover receiving part of the existing manhole cover receiving frame.
There are also drawbacks such as the raising ring rattling when a vehicle passes by and cracks appearing on the pavement surface.

The present invention aims to provide a mounting structure for a raised ring that eliminates such drawbacks.

Therefore, the present invention has an inner peripheral surface that fits on the outer periphery of the manhole outer cover, a support surface that supports the lower surface of the outer periphery of the outer cover, and an upper surface that matches the top surface of the outer cover in a state where the outer cover is supported. The outer cover mounting part of the existing manhole cover receiving frame has an outer cover mounting part similar to the above, on the upper part, and the inner periphery of the outer cover device part of the existing manhole cover receiving frame on the lower part. An adhesive is interposed between the outer circumferential surface that fits on the surface, the inner lower surface that abuts the support surface, and the contact surface, and the joint bolts are used to reach from the support surface of the raising ring to below the support surface of the existing manhole outer cover support frame. This is what happens.

According to this mounting structure of the raising ring, it is necessary to drill threaded holes for the coupling bolts in the existing manhole cover frame during installation work, but this requires using the raising ring as a hole drilling jig. Therefore, screw holes can be machined relatively easily at precise locations. Therefore, on-site work can be carried out reliably and quickly. Furthermore, with this mounting structure for the raising ring, even if the top surface of the existing manhole cover receiving frame and the outer cover attachment part are worn, the adhesive fills the gap caused by this wear, so there is no rattling. Therefore, the adhesive will not come off or the bolts will not loosen due to the impact of a passing vehicle, and the pavement surface will not be cracked. Furthermore, there is no need to dig holes in the paved road surface around the existing manhole cover frame, which is required in the conventional work to raise the height of the manhole cover frame.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, 2 is a raising ring, 4 is an existing manhole cover receiving frame, and 6 is an outer cover of the manhole.

As shown in Fig. 3, the existing manhole cover support frame 4 is installed on the road surface 10 that is to be paved completely, and when it coincides with the road surface 10 and the manhole outer cover 6 is attached, the upper surface of the manhole outer cover 6 is installed. It has an outer cover mounting part 20 consisting of an upper surface 12 that coincides with the manhole outer cover 6, an inner circumferential surface 16 that fits on the outer periphery 14 of the manhole outer cover 6, and a support surface 18 that supports the lower surface of the outer periphery of the manhole outer cover 6. There is. A raising ring 2 is attached to the existing manhole cover receiving frame 4 with the outer cover 6 removed, and the outer cover 6 is attached to the raising ring 2 to raise the road surface 10 to form a new road surface 10a as shown in FIG. It is in a state of

The raising ring 2 is as shown in FIGS. 1 and 2, and has a ring shape with an appropriate thickness in the vertical direction, and has an outer cover at the top that is the same as the outer cover attachment part 20 of the existing manhole cover support frame 4. It has a mounting part 20a.

Similarly, the outer lid mounting portion 20a has an upper surface 12a1 and an inner periphery 16.
a, and a support surface 18a. Further, at the lower part of the raising ring 2, there is an outer circumferential surface 22 that fits into the inner circumferential surface 16 of the outer cover mounting part 20 (Z) of the existing manhole cover receiving frame 4, and an inner lower surface 24 that contacts the support surface 18 of the outer cover mounting part 20. and an outer lower surface 26 that comes into contact with the upper surface 12 of the outer lid attachment part 20. The outer circumferential surface 27 between the upper surface 12a and the outer lower surface 26 is formed to have approximately the same outer diameter as the outer diameter of the upper surface 12 of the existing manhole cover receiving frame 4, and the inner circumferential surface 25 between the supporting surface 18a and the inner lower surface 24 is The inner diameter is approximately the same as the inner diameter of the support surface 18 of the existing manhole cover receiving frame 4. Then, if, for example, six bolt insertion holes 28 for coupling are formed at equal intervals in the circumferential direction through the support surface 18a and the inner lower surface 24, the bolts can be inserted into the lower side of the support surface 18a. A large-diameter portion 32 is provided in steps 30 such that the head thereof is located thereon. The lower part of the raising ring 2 is attached to the outer cover attachment part 20 of the existing manhole cover support frame 4, and then the manhole outer cover 6 is attached, resulting in the state shown in FIG. 3. In the figure, 34 is a connecting bolt, 35 is a spring washer, 36 is a screw hole, and 38 is an adhesive layer.

An example of the process for installing the raised ring 2 is as follows. First, the raising ring 2 and the existing manhole receiving frame 4 are adhesively bonded to each other by applying an adhesive to their adhesive surfaces. Next, a screw hole 36 corresponding to the bolt insertion hole 28 of the raising ring 2 is bored in the support surface 18 of the existing manhole cover receiving frame 4. In that case, fit the guide J/naru bush 42 as shown in FIG. .

Then, use the connecting bolts 34 to connect all the existing parts of the raising ring 2 to the Wit receiving frame 4.Epoxy adhesive, which can adjust the curing speed and elasticity, is suitable for the adhesive used. However, since the final connection will be bolted, other materials may be used.

[Brief explanation of drawings]

FIG. 1 is a plan view of a raised ring used in an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view taken along line A-A in FIG. 1, and FIG. Figure 4 shows a bushing used in an embodiment of this invention, al is a plan view, and ('
bl is a BB sectional view of fal. 2... Raising ring, 4... Existing manhole cover support frame, 6... Manhole outer cover, 12... Top surface, 16...
・Inner peripheral surface, 18... Support surface, 20... Outer lid attachment part,
12a...Top surface, 16a...Inner peripheral surface, 18a...
Supporting surface, 22... Outer peripheral surface, 24... Inner lower surface, 26
...Outside lower surface, 28...Bolt insertion hole, 34...
Connection bolt, 36... screw hole, 38... adhesive layer,
42... Bush O 1st [p 2nd 0a 12a 16a 18a

Claims (1)

[Claims] (1) An outer cover consisting of an inner peripheral surface that fits on the outer periphery of the manhole outer cover, a support surface that supports the lower surface of the outer periphery of the outer cover, and an upper surface that matches the height of the upper surface of the outer cover while supporting the outer cover. For the outer cover mounting part of the existing manhole cover receiving frame that has the mounting part,
The upper part has an outer cover attachment part similar to the above, and the lower part has an outer circumferential surface that fits into the inner circumferential surface of the outer cover attachment part of the existing manhole cover receiving frame, an inner lower surface that comes into contact with the support surface, and an inner lower surface that comes into contact with the above upper surface. A raising ring having a contacting outer lower surface is fitted at the lower part, and an adhesive is interposed between the fitting surfaces and the abutting surfaces, and the existing manhole cover receiving frame is supported from the supporting surface of the raising ring. A mounting structure for a manhole outer cover raising ring that is connected with a connecting bolt that reaches below the surface.