KR20110129233A - Connecting apparatus for manhole cover - Google Patents

Abstract

PURPOSE: A connecting device of a manhole cover is provided to open a manhole cover and to enable a user to conveniently fix a height adjusting ring to a manhole body. CONSTITUTION: A connecting device of a manhole cover comprises a first connecting part(40) and a second connecting part(50). The first connecting part fixes a manhole body(10) and a height control ring(20). A support flange(11) is formed on the top of the inner circumference of the manhole body and is fixed to the ground. The height adjusting ring is settled on the top of the support flange. The second connecting part fixes the height adjusting ring and a manhole cover.

Description

Connecting apparatus for manhole cover

The present invention relates to a fastening device for a manhole cover, and more particularly, to easily fix a manhole body, a height adjustment ring, and a manhole cover by a first fastening part and a second fastening part including an inserted nut. It relates to a fastening device of the manhole cover.

In general, the configuration of the manhole, the support flange is formed on the upper part of the inner circumference of the manhole body, and ribs formed at regular intervals on the outside are fixed to the concrete of the ground, and the height adjusting ring is seated on the support flange according to the situation to increase the height of the manhole cover. By adjusting and seating the manhole cover on the seating jaw formed in the inner circumference of the height adjustment ring is to be opened and closed by the manhole cover if necessary. At this time, the long hole formed on both sides of the manhole cover has a structure that is equipped with an opening and closing handle has a problem that can be easily opened by anyone.

Thus, to solve the above problems, as a "manhole cover locking device" of the Republic of Korea Utility Model Registration No. 137703 filed by the applicant, look at Figure 7 as follows.

The height adjustment ring 20 is seated and fixed to the upper part of the manhole body 10 fixed to the ground and the support flange 11 formed on the inner circumference of the manhole body 10, and the manhole cover to the upper part of the height control ring 20. It is to fix the 30. At this time, the height adjustment ring 20 is provided with a seating jaw 21 formed with a coupling hole 22 on the inner circumference of the height adjustment ring 20 so that the manhole body 10 and the height adjustment ring 20 can be fastened and fixed. By inserting the bolt (B1) into (22) it is to fasten and fix the screw (N1) provided on the bottom surface of the support flange (11). And the seating jaw (21) is provided with insertion grooves (21a) on both sides and is characterized in that by inserting and fixing the ruled projections (30a) formed on the outside of the bottom surface of the manhole cover 30 to face the insertion groove (21a). do.

In the conventional locking device of the manhole cover configured as described above, the bolt (B1) and the nut (N1) not fixed in fastening and fixing the manhole body 10 and the height adjustment ring 20 must be fastened and fixed in a narrow space. Therefore, not only the work is difficult, but there is a problem that the bolt or screw screwed during operation. In addition, the manhole cover 30 also had a problem that anyone can easily open in addition to the person concerned.

And, as a "locking device for height adjustment manhole cover" of Utility Model Registration No. 137704, look at Figure 8 as follows.

In fixing the manhole body 10 fixed to the ground and the height adjustment ring 20 to the upper inside of the manhole body 10, and fixing the manhole cover 30 to the height control ring 20 above And a horizontal support 60 having a first tap hole 60a and a second tap hole 60b instead of screws fastened to the bolts B2 and B3 on the bottom of the manhole body 10 and the bolts B2 and B3. It is characterized in that the fastening.

In other words, the support flange 11 is formed in the inner circumference of the height adjustment ring 20 has a seating jaw 21 having a fusion portion 21b formed therein and a fusion portion 11b formed in the inner circumference of the manhole body 10. Is formed. In this case, the coupling hole 22 and the insertion hole 12 are formed in the center of the fusing parts 21b and 11b to allow the bolt B2 to pass therethrough. On the other hand, the bolt (B2) of the both sides penetrating the coupling hole 22 and the insertion hole 12 and the first tap hole (60a) formed on both sides of the horizontal support 60 provided on the bottom surface of the manhole body 10 and Fastening is fixed.

In addition, a fastening hole 31 is formed in the center of the manhole cover 30 to pass through the bolt B3 through the fastening hole 31 to be fastened with the second tab hole 60b formed at the center of the horizontal support 60. It is fixed.

As described above, the conventional "clamping device for manhole cover for height adjustment" is a horizontal support (60) instead of a screw that is fastened with a bolt in fastening and fixing an unfixed screw which is a problem of the conventional "clamping device for manhole cover". The first tap hole (60a), the second tap hole (60b) to form a fastening to fix the problem to solve.

However, there is still a problem in fastening and fixing the bolt because the horizontal support 60 is also not fixed. In addition, the first tap hole 60a and the second tap hole 60b formed in the horizontal support 60 have a problem in that the screw thread is broken and the bolts B2 and B3 cannot be fastened.

In particular, as described above, the screw that is fastened with the bolt is not fixed, and there is a problem that the screw does not function as a pulley locking device due to vibration generated every time the vehicle passes over the manhole cover 30. . In addition, there is a problem that the screw that is fastened with the bolt over time is corroded, it is impossible to fasten and release even with a tool.

Thus, the present invention was invented to solve the above problems, in fixing the manhole cover and the height adjustment ring and the manhole body, it can be fixed with a simple configuration fastening, so that the manhole cover can not be opened other than the relevant person An object of the present invention is to provide a fastening device for a manhole cover.

In addition, there is another object to be able to fix the height adjustment ring to adjust the height of the manhole cover simply configured fastening.

In addition, there is another purpose to form a fastening hole formed in the manhole cover only in the center to be fixed with the manhole body.

In addition, there is another object to facilitate the separation of the manhole cover.

In addition, there is another object to facilitate positioning of the fastening portion.

The present invention for achieving the above object, a support flange is formed on the upper portion of the inner circumference and the manhole body is fixed to the ground and the height adjustment ring seated on the upper support flange and a seating jaw formed in the inner circumference of the height adjustment ring In the manhole consisting of a manhole cover seated on, characterized in that it comprises a first fastening portion for fixing the manhole body and the height adjustment ring and a second fastening portion for fixing the height adjustment ring and the manhole cover.

The first fastening part may include a first bolt inserted into a coupling hole in which a recess groove is formed in the seating jaw, and a first nut inserted into the support flange.

The second fastening part may include a second bolt inserted into a fastening hole having a recess groove formed in the manhole cover and a second nut inserted into the seating jaw.

In addition, the first setting projection provided on the insertion wheel formed on the bottom surface of the height adjustment ring, and the first setting groove is provided in the support flange so that the first setting projection is inserted to set the first position of the first fastening portion It further comprises a setting unit.

The apparatus may further include a second setting protrusion provided as a bottom surface of the manhole cover, and a second setting groove provided in the seating jaw so that the second setting protrusion may be inserted to set the correct position of the second fastening portion. It is characterized by.

The second fastening part may further include a central bolt inserted into a fastening hole having a recess hole formed at the center of the manhole cover and a central nut inserted into the center of the horizontal support fixed to the bottom of the support flange. It features.

In addition, the central bolt is inserted into the fastening hole formed in the manhole cover, characterized in that the support is integrally formed in the central bolt located on the bottom of the fastening hole.

In addition, the first setting projection provided on the insertion wheel formed on the bottom surface of the height adjustment ring, and the first setting groove is provided in the support flange so that the first setting projection is inserted to set the first position of the first fastening portion It further comprises a setting unit.

In addition, the upper portion of the inner circumference is formed with a support flange and a manhole body fixed to the ground and a height adjustment ring seated on the upper support flange and a seating jaw having an insertion groove formed in the inner circumference of the height adjustment ring is provided in the insertion groove A manhole comprising a ruler protrusion formed on the bottom of the manhole cover to be inserted and fixed, wherein the seating jaw is provided with a coupling hole having a recess groove formed therein, and the support flange has a first nut inserted therein. Inserting a first bolt in the first nut and characterized in that it comprises a first fastening portion fastened and fixed.

In addition, the first setting projection provided on the insertion wheel formed on the bottom surface of the height adjustment ring, and the first setting groove is provided in the support flange so that the first setting projection is inserted to set the first position of the first fastening portion It further comprises a setting unit.

In addition, in the upper part of the inner circumference of the manhole consisting of a manhole body is formed on the support flange and fixed to the ground and the manhole cover seated on the upper support flange, the fastening hole is formed in the manhole cover is formed into a fastening hole and the fastening hole And a fastening part comprising a bolt and a nut inserted into the support flange to be fastened to the bolt.

The apparatus may further include a setting protrusion provided on the bottom surface of the manhole cover, and a setting groove provided on the support flange to insert the setting protrusion to set the fastening portion.

In the present invention as described above, in fixing the manhole body, the height adjustment ring and the manhole cover, it is fixed to the fastening portion simply configured, but there is an effect that can prevent the safety accident by not opening the manhole cover other than the person concerned.

In addition, there is also an effect that can be easily worked by fixing the height adjustment ring to adjust the height of the manhole cover simply configured fastening.

In addition, by forming a fastening hole formed in the manhole cover only in the center of the manhole cover to more easily secure the effect of increasing the efficiency of the work and to prevent foreign matter from entering into the fastening hole.

In addition, by lifting the manhole cover to release it can facilitate the separation operation of the manhole cover, there is also an effect that can prevent the safety accidents caused by the minor periphery due to the separation operation of the manhole cover.

In addition, by setting the exact position of the fastening portion by the setting portion, it is also possible to reduce the working time according to the position selection and at the same time prevent the safety accident caused by the sub-ambient.

1 is an exploded perspective view of a first embodiment according to the present invention;
2A is a cross-sectional view taken along line AA of FIG. 1;
2b is a cross-sectional view taken along line BB according to FIG. 1;
3 is an exploded perspective view of a second embodiment according to the present invention;
4A is a cross-sectional view taken along line CC of FIG. 3.
4B is a cross-sectional view of the combined DD line of FIG. 3.
4C is an essential part cross sectional view of another embodiment according to the second embodiment;
5 is an exploded perspective view of a third embodiment according to the present invention;
6 is a sectional view of principal parts of a fourth embodiment according to the present invention;
7 is a perspective view of a conventional main portion separated.
8 is a perspective view of a conventional main portion separated.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a first embodiment according to the present invention, FIG. 2A is a cross sectional view taken along line A-A according to FIG. 1 and FIG. 2B is a cross sectional view taken along line B-B according to FIG.

In the fastening device of the manhole cover according to the first embodiment of the present invention, the support flange 11 is formed on the upper portion of the inner circumference and the height of the manhole body 10 fixed to the ground and seated on the support flange 11 In the manhole consisting of a manhole cover 30 seated on an adjustment ring 20 and a seating jaw 21 formed in the inner circumference of the height adjustment ring 20, the manhole body 10 and the height adjustment ring 20 It includes a first fastening portion 40 for fixing and the second fastening portion 50 for fixing the height adjustment ring 20 and the manhole cover 30.

Thus, as shown in Figure 2a as a cross-sectional view of the first fastening portion 40 including the first bolt 41 and the first nut 42 as a main portion, the manhole body 10 and the height adjustment ring ( 20 shows that the first fastening portion 40 is fixed. That is, the seating jaw 21 is provided with a coupling hole 22 in which the slotting grooves 22a are formed at equal intervals, and the first bolt 41 inserted into the coupling hole 22 is supported. The first nut 42 is inserted into and opposed to the first bolt 41 provided on the flange 11.

As described above, the first fastening portion 40 is fixed by the first setting portion 80 before the height adjustment ring 20 is fixed to the upper support flange 11. That is, the first setting unit 80 is inserted into the first setting projection (80a) and the first setting projection (80a) provided on both sides in the insertion wheel 23 formed on the bottom surface of the height adjustment ring (20). It is to include a first setting groove (80b) provided in the support flange (11).

And, as shown in Figure 2b as a cross-sectional view of the second fastening portion 50 including the second bolt 51 and the second nut 52 as the main portion, the height adjustment ring 20 and the manhole cover ( 30 is shown fixed by the second fastening portion (50). That is, the second bolt 51 provided in the seating jaw 21 has a second bolt 51 inserted into the fastening hole 31 in which the slotting groove 31a is formed at equal intervals in the manhole cover 30. It is fastened and fixed with the second nut 52 inserted to face the ().

In addition, as described above, the second fastening portion 50 is fixed by the second setting portion 81 before the manhole cover 30 is fixed to the seating jaw 21. That is, the second setting part 81 is provided on the seating jaw 21 so that the second setting protrusion 81a and the second setting protrusion 81a are provided at both sides of the bottom surface of the manhole cover 30. It is to include a second setting groove (81b).

In other words, in the seating jaw 21 of the height adjustment ring 20, the coupling hole 22 is formed with a slotting groove 22a into which the first bolt 41 is inserted to be fixed to the manhole body 10. And, the second bolt 51 is inserted into the fastening hole 31 is formed with the slotting groove 31a of the manhole cover 30 is inserted into the second nut 52 alternately provided at equal intervals, The second setting groove 81b is provided at both sides.

Accordingly, the height adjusting ring 20 is fixed to the support flange 11 by the first setting part 80 and then fixed to the first fastening part 40 and the second setting part 81. By fixing the manhole cover 30 by the second fastening portion (50). At this time, the first bolt and the second bolt will be desirable to form a bolt head to be fastened using a hexagon wrench.

In addition, by fixing the height adjustment ring 20 is formed in the same position so as to fasten another height adjustment ring 20 formed in the same as a normal bolt, it is possible to adjust the height of the manhole cover 30 will be.

Thus, the manhole cover 30 can be easily fixed to the first and second fastening portions, which are simply configured, and the manhole cover 30 can not be opened except for the person concerned, thereby preventing safety accidents.

3 is an exploded perspective view of a second embodiment according to the present invention, FIG. 4A is a cross sectional view taken along line C-C according to FIG. 3, and FIG. 4B is a cross sectional view taken along line D-D according to FIG. 3.

In the fastening device of the manhole cover of the second embodiment according to the present invention, the first fastening portion 40 and the first setting portion 80 is assumed to be the same as the configuration of the first embodiment according to the present invention described above.

Therefore, in the fastening device for the manhole cover according to the second embodiment of the present invention, the second fastening portion 50 is a fastening hole 31 having a recess groove 31a formed at the center of the manhole cover 30. It further includes a central nut 54 inserted in the center of the horizontal support 60 is fixed to the center bolt 53 and the bottom of the support flange 11 is fastened with a fastening member 70.

As described above, FIG. 4A is a cross-sectional view of the first fastening part 40 as a main part, and the manhole body 10 and the height adjustment ring 20 are connected to the first fastening part by the first setting part 80. 40 is shown in the fixed position by the first fastening portion (40).

And, as shown in Figure 4b, a cross-sectional view of the second fastening portion 50 including the central bolt 53 and the central nut 54 as a main portion, the horizontal support 60 and the manhole cover 30 It is shown that the fixed by the second fastening portion (50). That is, the support flange 11 of the manhole body 10 is further formed with an insertion hole 12 formed with a slotting groove 12a, and a normal bolt 70a is inserted into the insertion hole 12. It is fastened to the nut (70b) provided on both sides of the horizontal support 60 is fixed to the bottom of the support flange (11). In this case, the nut 70b may be inserted into the horizontal support 60 or form a through hole into which the bolt 70b is inserted, and may be welded to the bottom of the through hole.

Thus, the horizontal support 60 is fixed to the bottom of the support flange 11 first, and then the central bolt 53 inserted into the fastening hole 31 in which the recess groove 31a is formed in the center of the manhole cover 30. Fastening to the central nut 54 is inserted into the center of the horizontal support (60).

In addition, as described above, by fixing another height adjustment ring 20 formed in the same position as the upper portion of the height adjustment ring 20 so as to be fastened with a conventional bolt, the height of the manhole cover 30 is fixed. It can be adjusted.

The fastening device of the manhole cover configured as described above, by inserting the central bolt 53 only in the center of the manhole cover 30 by fastening and fixing with the central nut 54 formed on the horizontal support 60, the manhole cover (easily) 30) can be fixed, and the effect of improving the efficiency of the work as well as to prevent the entry of foreign matter into the fastening hole as much as possible.

Figure 4c is a cross-sectional view of the main portion of another embodiment according to the second embodiment described above, wherein the central bolt 53 is inserted into the fastening hole 31 formed in the manhole cover 30, the bottom surface of the fastening hole 31 The central bolt 53 is located in the support 55 is formed integrally.

That is, the configuration except for the support 55 is assumed to be the same as in the above-described second embodiment.

First, the central bolt 53 is inserted into the fastening hole 31 in which the recess groove 31a is formed in the center of the manhole cover 30, and then the bottom surface of the fastening hole 31 formed in the center of the manhole cover 30 is fixed. It is to be provided integrally by fixing to the central bolt 53 is inserted and positioned at intervals the support (55). At this time, the support 55 is preferably formed with a through hole in the center so that the central bolt 53 is penetrated, and has a larger diameter than the fastening hole 31 so as to support the manhole cover 30. It should be desirable. In addition, the support 55 will be preferably fixed to the central bolt 53 by welding or the like.

 As described above, when the central bolt 53 having the support 55 is rotated and released by a hexagon wrench, the support 55 is also integrally fixed to the central bolt 53, and thus the central nut 54 is fixed. Ascending upward by the screw thread is fastened with. At this time, since the support 55 is raised upward while supporting the bottom of the manhole cover 30, the manhole cover 30 is also raised to be spaced apart from the height adjustment ring 20.

That is, while releasing the manhole cover 30 is separated from the height adjustment ring 20 is an advantage that can be separated more easily the manhole cover 30. In addition, there is also an advantage of preventing a safety accident caused by the worker's sub-circumference during the operation of separating the heavy manhole cover 30.

Figure 5 is an exploded perspective view of the third embodiment according to the present invention, the height adjusting ring 20 by the conventional manhole cover 10 and the first setting portion 80, the support flange 11 of the manhole body 10 It is shown in place, and fixed to the first fastening portion (40).

In the fastening device of the manhole cover of the third embodiment according to the present invention, the first fastening portion 40 and the first setting portion 80 is assumed to be the same as the configuration of the first embodiment according to the present invention described above.

That is, the height adjustment ring 20 is fixed to the upper portion of the support flange 11 of the manhole body 10 by the first setting portion 80 and the first fastening portion 40, the height adjustment ring 20 The inner circumference is provided with a seating jaw 21 in which the insertion recess 21a is formed and fixed to the outer bottom surface of the manhole cover 30 so as to be inserted into the insertion recess 21a.

Therefore, by recycling the conventional manhole cover 30 having the rubbing protrusions 30a, it is possible to reduce the economic loss to produce a new product.

6 is a sectional view showing main parts of a fourth embodiment according to the present invention, showing a basic configuration of a manhole.

That is, in the manhole consisting of a manhole body 10 formed at the upper portion of the inner circumference 11 and fixed to the ground, and a manhole cover 30 seated at the upper portion of the support flange 11, the manhole cover ( A nut 71b inserted into the support flange 11 to be fastened to the fastening hole 31 having the slot groove 31a formed therein and the bolt 71a inserted into the fastening hole 31 and the bolt 71a. It is to include a fastening portion 71 consisting of.

As described above, the fastening portion 71 is fixed by the setting portion 82 before the manhole cover 30 is fixed to the upper support flange 11. That is, the setting part 82 has a setting protrusion 82a provided at both sides of the bottom surface of the manhole cover 30 and a setting groove 82b at the support flange 11 so that the setting protrusion 82a is inserted. It is to include.

As described above, in the fastening device of the manhole cover of the present invention, by having an inserted nut, it can be easily fixed and released, and can be used semi-permanently as it can prevent loosening caused by vibration. This has the advantage of speeding up work.

In addition, the dent groove should have a depth formed so that the bolt head does not protrude outward, and the inserted nut should also not protrude outward. In other words, by stacking the height adjustment ring 20 to adjust the height of the manhole cover 30, there is also an advantage that can be prevented by a safety accident caused by falling apart by fixing stably so as not to interfere with the portion seated.

In addition, the setting projection is made by the shape of the hemisphere, it is possible to more easily position the height adjustment ring 20 or the manhole cover 30 which is a lot of weight. In other words, by setting the correct position of the fastening portion, it is also possible to reduce the working time according to the position selection and to prevent the safety accident caused by the sub-circumference.

10: manhole body
11: support flange
11a: Insertion groove
11b: melted portion
12: insertion hole
12a: Slotting groove
20: height adjustment ring
21: seating chin
21a: Insertion groove
21b: melted portion
22: coupling hole
22a: digging groove
23: insertion wheel
30: manhole cover
30a: rubbing protrusion
31: fastener
31a: digging groove
40: first connection
41: first bolt
42: first nut
50: second connection
51: second bolt
52: second nut
53: center bolt
54: center nut
55: support
60: horizontal support
60a: first tap ball
60b: second tap hole
70: fastening member
70a: Bolt
70b: Nut
71: fastening part
71a: Bolt
71b: Nut
80: first setting part
80a: first setting protrusion
80b: first setting groove
81: second setting part
81a: second setting projection
81b: second setting groove
82: setting part
82a: setting protrusion
82b: Setting groove

Claims (12)

A support flange 11 is formed at an upper portion of the inner circumference and a manhole body 10 fixed to the ground and a height adjustment ring 20 and an inner circumference of the height adjustment ring 20 seated on the upper support flange 11. In the manhole consisting of a manhole cover 30 seated on the formed seating jaw 21,
A first fastening part 40 fixing the manhole body 10 and the height adjustment ring 20;
A second fastening part 50 fixing the height adjustment ring 20 and the manhole cover 30;
Fastening device of the manhole cover, characterized in that it comprises a. According to claim 1, The first fastening portion 40, The first bolt 41 and the support flange (inserted into the coupling hole 22 is formed with a recess groove 22a in the seating jaw 21) 11) fastening device of the manhole cover, characterized in that it comprises a first nut (42) inserted in. According to claim 1, The second fastening portion 50, The second bolt 51 and the seating jaw (inserted into the fastening hole 31 is formed with a recess groove 31a in the manhole cover 30) The fastening device of the manhole cover, characterized in that it comprises a second nut (52) inserted in the 21. According to any one of claims 1 to 3, wherein the first setting projection (80a) and the first setting projection (80a) provided in the insertion ring 23 formed on the bottom surface of the height adjustment ring (20) A manhole cover further comprising a first setting portion 80 provided with a first setting groove 80b in the support flange 11 to set the position of the first fastening portion 40 to be inserted. Fasteners. The mounting jaw 21 according to any one of claims 1 to 3, wherein the second set protrusion 81a and the second set protrusion 81a are inserted into the bottom surface of the manhole cover 30. The second setting groove 81b is provided in the fastening device of the manhole cover, characterized in that it further comprises a second setting portion (81) for setting the correct position of the second fastening portion (50). According to claim 1, wherein the second fastening portion 50, the central bolt 53 and the support flange is inserted into the fastening hole 31 is formed with a recess groove 31a in the center of the manhole cover (30). (11) The fastening device of the manhole cover, characterized in that it further comprises a central nut (54) inserted in the center of the horizontal support 60 is fixed to the bottom fastening member (70). According to claim 6, The central bolt 53 is inserted into the fastening hole 31 formed in the manhole cover 30, the support hole 55 in the central bolt 53 located on the bottom surface of the fastening hole 31 Fastening device of the manhole cover, characterized in that is formed integrally. The support flange (11) of claim 6, wherein the first setting protrusion (80a) and the first setting protrusion (80a) are provided in the insertion wheel (23) formed at the bottom of the height adjustment ring (20). The first setting groove (80b) is provided in the fastening device of the manhole cover, characterized in that it further comprises a first setting portion (80) for setting the correct position of the first fastening portion (40). A support flange 11 is formed at an upper portion of the inner circumference and a manhole body 10 fixed to the ground and a height adjustment ring 20 and an inner circumference of the height adjustment ring 20 seated on the upper support flange 11. In the manhole is provided with a seating jaw (21) formed with an insertion groove (21a), including a rubbing protrusion (30a) formed on the bottom surface of the manhole cover (30) to be inserted and fixed in the insertion groove (21a),
The mounting jaw 21 is formed with a coupling hole 22 having a slot groove 22a formed therein, and the supporting flange 11 has an inserted first nut 42 formed therein. Inserting the first bolt 41, the fastening device of the manhole cover, characterized in that it comprises a first fastening portion 40 which is fastened and fixed to the first nut (42). The support flange (11) of claim 8, wherein the first setting protrusion (80a) and the first setting protrusion (80a) are inserted into the insertion wheel (23) formed at the bottom of the height adjustment ring (20). The first setting groove (80b) is provided in the fastening device of the manhole cover, characterized in that it further comprises a first setting portion (80) for setting the correct position of the first fastening portion (40). In the manhole consisting of a manhole body 10 is formed on the upper portion of the inner circumference 11 and fixed to the ground and a manhole cover 30 seated on the upper portion of the support flange 11,
Inserts into the support flange 11 to be fastened to the fastening holes 31 and the bolts 71a inserted into the fastening holes 31 and the bolts 71a formed in the manhole cover 30. Fastening device of the manhole cover, characterized in that it comprises a fastening portion 71 consisting of a nut (71b). The method of claim 10, wherein the setting projection 82a provided on the bottom surface of the manhole cover 30, and the setting groove 82b is provided in the support flange 11 so that the setting projection 82a is inserted into the fastening portion Fastening device of the manhole cover, characterized in that it further comprises a setting portion 82 for setting the correct position of (71).

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