KR100761794B1 - Manhole safety cover - Google Patents

Abstract

A manhole safety cover is provided to prevent a traffic accident caused by the separation of a manhole cover through keeping the manhole cover and a manhole frame locked and pressed by a locking device, to protect pedestrians from an electric shock by cutting off the inflow of rainwater to a manhole cover, to prevent the noise occurrence of a manhole cover and to protect facilities in a manhole by keeping a manhole cover not to be opened without permission. The manhole safety cover is provided for preventing the separation of a manhole cover(1) against vehicle traffic and the inflow of rainwater to a manhole by locking a manhole cover and a manhole frame using a locking device comprising a central bolt(4) and a washer(15) inserted to the manhole cover, three or more locks(7) placed according to the shape of a manhole, lock holders(9) supporting the locks, a lock operating plate(3) coupling the locks and the lock holders on a manhole frame stably and locking the manhole cover and the manhole frame effectively, a lock support(6) limiting and guiding the movement of the locks, an operating plate sleeve(5) housing the upper part of the lock operating plate and guiding a vertical movement and housing the upper part of the central bolt together with the manhole cover, and a surge spring(12) and a retainer(23) attached to the lower part of the central bolt to keep the central bolt not to get loose again.

Description

Manhole Safety Cover {Manhole Safety Cover}

1 is a cross-sectional view showing an embodiment of the present invention

2 is a detailed separated perspective view of the present invention

Figure 3 is a side view of the crimp lock release state of the present invention

Figure 4 is a side view of the compression lock state of the present invention

Figure 5 is an operational side view of the clamp and the surge spring in the crimp lock state of the present invention

Figure 6 is an operation side shaving of the clamp and the surge spring in the unlocked state of the present invention

7 is a side view of the compression lock applying the inner plate according to another embodiment of the present invention.

Figure 8 is a side view of the compression lock release applying the inner plate according to another embodiment of the present invention

Figure 9 is a side view of the pressing lock the clamping clamp surge spring as another embodiment of the present invention

10 is a side view of the compression lock of the clamp clamp surge spring as another embodiment of the present invention

-Explanation of symbols for the main parts of the drawings-

1. Manhole cover

2. Lid central hole

3. Catch operation plate

4. Center bolt

5. Operation plate sleeve

6. Catch Pole

7. Catch

8. Clasp

9. Clasp Holder

10. Clamp Surge Spring

11. Adjustable bolt

12. Surge Spring

13. Center Nut

14. Fastening Bolt

15. Washers

16. Manhole Frame

17. Actuator Insert

18. Rubber ring

19. Adjustment nut

20. Fastening Bolt

21.Spring stem

22. Rotate Key

23. Retainer

24. Inner board

The present invention is installed in the manhole installed in the basement of the road, which is the main infrastructure of the telecommunications and power industry, by installing a separate locking device on the manhole cover to prevent the traffic accident caused by the departure of the manhole cover due to the vehicle traffic, Preventing pedestrian electric shock due to manpower flooding of manholes due to flooding of manholes, preventing noise of manhole cover due to vehicle traffic, and protecting manhole safety facilities by preventing the opening of manholes other than those concerned. will be.

  In general, the manhole is installed in the basement of the road for the purpose of cable connection and maintenance, such as communication and power cables, and is sealed on the road surface with a manhole cover. The manhole cover for the purpose of sealing the manhole is placed on the manhole frame without any locking device. Therefore, the manhole cover is separated by the passage of a large vehicle, which causes frequent heavy traffic accidents, resulting in human and material loss, and the leakage of rainwater between the manhole frame and the manhole cover and flooding of the manhole, resulting in pedestrian shock. In addition, the noise of the manhole cover due to the vehicle traffic caused complaints, as well as the situation does not have a locking function anyone can open the manhole cover.

  Accordingly, the present invention to solve this problem, to provide a manhole cover of a special type of clasp and clasp operating plate, and the clasp support, the operating plate sleeve, and also the central bolt to the manhole cover.

To this end, looking at the prior art, in the manhole cover formed with a square hole for the switch in left and right symmetry, the bottom of the manhole cover is formed with ribs for increasing the strength, the packing is added. The manhole cover is placed on its upper part of the manhole frame with its own weight, and is exposed to road environments such as soil and debris, and there is a problem that large traffic accidents frequently occur due to manhole cover detachment by impacting the manhole cover of a large vehicle. . In addition, the flooding of manholes caused by rain causes short-circuit electric shocks to pedestrians. Moreover, the noise of manhole covers caused by traffic can cause civil complaints. There is a problem that can no longer protect the main facilities.

Therefore, in order to solve the conventional problems at the same time, a special type of clasp and clasp operation plate, actuating plate sleeve, clasp column, and central bolt are specially designed on the manhole cover with a rubber ring attached to the bottom thereof, and thus the manhole cover and manhole. By not only interlocking the frame but also by pressing action, it is possible to prevent traffic accidents caused by the detachment of manhole cover and to perform waterproof function, preventing manhole flooding and noise of manhole cover, and opening it by unauthorized persons. The purpose of the present invention is to provide a manhole safety cover that can protect the facilities in the manhole.

The manhole safety lid according to the present invention for achieving the above object has the same shape as the manhole, the upper surface of the lid is provided with a groove for the switchgear, the lower surface of the manhole cover (1) in which the rubber ring 18 is mounted In the above, the manhole cover (1) is fastened to the manhole frame 16 by the rotation means, so that the clamping pad (7) having a clamping blade (8) at one end and the fastening clamp (7) is attached to the A clamping plate (3) coupled to the operating plate sleeve (5) by a rotating means to allow the clamping plate (7) to move back, forth, up and down, and to restrict and guide the operation of the clamping plate (7). 6) and also through the clamp holder (9) and operating plate sleeve (5) for guiding the front and rear, up and down, rotational movement of the clamp (7) by mounting the clamp (7) inside the clamp operating plate (3) Is engaged with the thread, and a surge spring 12 is attached to one end thereof. Consists of a central bolt (4) tightened by a central nut (13). Therefore, the locking clamp operating plate 3 having a thread therein, which is inserted into the operating plate sleeve 5, moves up and down to be mounted on the clamp holder 9 and guides the locking pillar 6 and the locking clamp holder 9. Receiving the lock (7) before and after, up and down, rotation to allow the manhole cover (1) to be crimped lock to the manhole frame 16, but the tension of the surge spring 12 is the compression bolt of the central bolt ( It is achieved by a manhole safety cover, characterized in that configured to maintain the compression lock state by preventing the repetition of 4).

Hereinafter, an embodiment of the manhole safety cap of the present invention will be described in detail with reference to the accompanying drawings.

  1 is a cross-sectional view of the entire installation of the manhole safety cap showing a preferred embodiment of the present invention, Figure 2 is a perspective view separated in more detail of the present invention, Figure 3 is a side view showing a crimping lock release state of the present invention, Figure 4 is a side view of the crimp lock state of the present invention, Figure 5 is an operational side view showing the operating state of the clamp and the surge spring in the crimp lock state of the present invention, Figure 6 is a clamp and surge in the crimp lock release state of the present invention 7 is an operation side view of the spring, Figure 7 is a side view of the compression lock when applying the inner plate as another embodiment of the present invention, Figure 8 is a side view of the compression lock release when applying the inner plate as in Figure 7 of the present invention And, Figure 9 is a side view of the crimp release when applying the clamp clamp spring as another embodiment of the present invention, Figure 10 is also locked as in Figure 9 of the present invention It is a side view of the compression lock when the iron was applied surge spring.

  First, as shown in FIG. 1, the manhole safety cover according to the present invention is a manhole cover 1, a central bolt 4, a surge spring 12, a working plate sleeve 5, a fastener working plate 3, and a fastener (7), the clasp holder 9, the clasp pillar 6, and the fastening members 14 and 20 are comprised. In this configuration, the manhole cover 1 is placed on the inner jaw of the manhole frame 16 so as to be opened and closed, and a central bolt 4 is inserted into the lid central hole 2 of the lid so that the center bolt 4 is upper part. Is housed in the manhole cover (1) and the operating plate sleeve (5), the lower surface of the operating plate sleeve (5) accommodates the upper head of the central bolt (4) and is coupled to the lid by a fastening member. In addition, the locking plate operating plate 3 having an internal square thread formed therein so as to accommodate the square thread of the central bolt 4 therein is fastened to the central bolt 4 and is loosely coupled into the operating plate sleeve 5. As described above, the central bolt 4 penetrated through the central hole 2 of the lid is accommodated in the lid, with the operating plate sleeve 5 and the clamping plate 3 attached to the lid, and the surge spring 12 and the retainer 23 at the bottom. ) Is fastened with two central nuts 13 to a smaller diameter thread formed at one end thereof. As described above, fastening with two central nuts 13 to a small diameter thread formed at one end of the central bolt 4 is performed when the central bolt 4 is rotated in the state accommodated in the lid. The clamping plate operating plate (3) coupled to the larger thread is located in the operating plate sleeve (5) so as to freely move or rotate on the central bolt (4). Accordingly, the center bolt 4 and the center nut 13 are integrally moved without fastening the clamping plate 3 mounted on the larger thread of the center bolt 4. The surge spring 12 is loosely coupled to the lower portion of the central bolt 4 and prevented from being separated by the retainer 23.

As such, the clamp 7 is loosely coupled as a fastening member to the clamping plate operating plate 3 coupled to the central bolt 4, and the clamp 7 is attached to the clamping bracket 9 attached to the manhole cover 1. Is mounted. In addition, the clamping pillar (6) for limiting the rotational movement of the locking clamp (7) and to guide the up and down movement is mounted as a fastening member to the manhole cover (1) that is a geodetic fastener (7).

Herein, the configuration of the locking device, which may be a feature of the present invention, will be described in more detail with reference to FIGS. 3 and 4, and also FIGS. 5 and 6.

The manhole cover (1) is installed on a predetermined bottom surface, the locking device is the central bolt (4), the operating plate sleeve (5), the clamping plate operating plate (3), the clasp and the clamping column (6), clasp holder (9), In addition, the clamp 7 is loosely coupled to the clamp operating plate 3, and the clamp operating plate 3 is inserted into the operating plate sleeve 5 to facilitate vertical movement. The central bolt (4) is inserted in the center of the manhole cover (1) so as to be rotated in the receiving state, but through the operating plate sleeve (5) to engage with a square thread inside the locking plate operating plate (3) and the central bolt (4) The surge spring 12 is fitted to the lower portion and is tightened by the central nut (13). At this time, the center bolt (4) and the center nut (13) is integrally and firmly coupled, but the manhole cover (1) and the operation plate sleeve (5) and the clamping plate (3), the surge spring 12 is integrally coupled It is configured to be rotatable on the central bolt (4) axis.

One end of the clamp 7 is loosely coupled to the clamping plate operating plate 3 coupled to the central bolt 4 and the internal screw as described above, and is mounted on the clamp holder 9 mounted to the manhole cover 1. One side of the clasp holder (9) is provided with an adjustment bolt for adjusting the height of the clasp (7). In addition, the pillar 6 of the clamp 7 is mounted on the manhole cover 1 at an appropriate position with the clamp 7 to convert the clamp 7 into a forward and backward motion by limiting the rotation of the clamp 7.

The washer 15 mounted on the upper end of the central bolt 4 has the circular protrusion and the manhole cover 1 of the upper part of the central bolt 4 when the central bolt 4 is locked up. The waterproofing of the lid central hole (2) is made easy, and packing is attached to the bottom edge of the manhole cover (1) to achieve a waterproof function by pressing the manhole cover (1) by the locking device. In addition, when the surge spring 12 and the retainer 23 are attached to one end of the lower end of the central bolt 4, the manhole frame 16, the manhole cover 1, and the clamp 7 are pressed into the vehicle. Shock and vibration generated to prevent the central bolt (4) from recurring. That is, to prevent the rotation of the central bolt (4) by the vertical rising tension of the surge spring (12).

 The configuration according to the present invention has been described in detail as described above, and the operation according to the present invention will be described in detail with reference to FIGS. 2 and 3 and 4, and FIGS. 5 and 6. First, the crimping locking operation of the locking device will be described. First, the manhole cover 1 is in the crimp lock release state, that is, the lock 7 does not protrude to the edge of the manhole cover 1 in the manhole frame 16. Don't be afraid. At this time, when the center bolt 4 is rotated in the clockwise direction, that is, the locking direction by the rotation key 22, the upper part is inserted into the operating plate sleeve 5, and the locking plate operating plate 3 located above the center bolt 4 is provided. Since it is coupled with the central bolt (4) by the internal thread is intended to face downward. However, at this time, the clamping plate (3) is the clamping plate (7) that is just mounted on the clamp holder (9) does not secure the clamping plate 3, so the clamping plate 3 and the center bolt (4) ) Rotates integrally for the time being.

That is, the fasteners in which the frictional resistance generated when the fastener operating plate 3 moves on the central bolt 4 shaft by the rotation of the center bolt 4 are mounted on the clamp holder 9 only by their own weight. Since the locking inertia (3) and the center bolt (4) do not slide on each other on the thread because they are larger than the stop inertia of (7), they move together.

  3 and 4, the first rotation of the central bolt (4) with the pivoting key (22), the locking plate operating plate (3) without the fixing portion is on the square thread of the central bolt (4) It does not slip and moves integrally with the center bolt 4. In other words, when the central bolt (4) is rotated, it is integrally rotated together. Rotation of the clasp actuation plate 3 rotates the clasp 7 coupled thereto to advance the clasp blade 8 to the edge of the manhole cover 1 and the clasp blade 8 to the maximum edge. When advancing, one side portion of the clamp 7 comes into contact with the pillar 6 of the clamp and also contacts the side of the clamp holder 9 so that the edge of the manhole cover 1, namely the manhole 16 In the position that can be locked in the lock clamp 7 is stopped and also the rotation of the clamp operating plate (3) is stopped.

 However, the subsequent rotation of the central bolt 4 lowers the clamping plate 3 by fixing the clamping plate 3 and the clamping plate 7 and also lowers the clamping plate 7. Therefore, the locking blade blade 8 is raised around the clamp holder 9 and the compression lock is executed by approaching the manhole frame 16. In other words, it is compressed on the principle of leverage.

 At this time, the operating plate sleeve 5 accommodates the upper portion of the clamping plate 3 inside, thereby guiding the lowering of the clamping plate 3, and the clamping column 6 in contact with the side surface of the locking plate 7 ) Guides the lowering of the fraud stopper (7).

 The locking plate operating plate 3 moving downward in the operating plate sleeve 5 by the rotation of the central bolt 4 generates a tension while pressing the surge spring 12 mounted below the central bolt 4. The tension is transmitted to the central bolt (4). The tension of the surge spring 12 generated in this way prevents the rotation of the central bolt (4) due to the impact applied to the manhole cover 1 in the vehicle passage to maintain the compression lock state.

  The following describes the crimp lock release operation in the crimp lock state made as described above.

When the central bolt 4 is rotated in the pressing lock release direction by the pivoting key 22, the clamping operation plate is influenced by the clamping force 7 pressed by the manhole frame 16 and the tension of the lower surge spring 12. (3) is not rotated so that the pivoted central bolt (4) is rotated along the thread inside the clasp operation plate (3), so that the clasp operation plate (3) is raised. The rising clamping plate 3 is guided by the clamping pillar 6 and is raised along with the clamping clamp 7, and the clamping blade 8 is lowered about the clamping bracket 9 and the manhole is lowered. The clamping blade 8, which has been pressed against the mold 16, is released from the manhole frame 16 to release the crimp. At this time, the tension of the surge spring 12 is also reduced by the rise of the clasp operation plate 3.

Continuous rotation of the central bolt 4 after the release of the crimp releases the tension of the surge spring 12. From this time, the clamping plate operating plate 3 has the tension of the surge spring 12 or the Since the crimp between the clamp 7 and the manhole frame 16 has also been eliminated, only friction resistance through thread coupling with the central bolt 4 is present, so that the clamp is operated according to the rotational direction of the central bolt 4. The plate 3 rotates integrally. Therefore, the clamp 7 coupled to the clamping plate 3 is also driven in the rotational direction of the clamping plate 3, and the clamp 7 moves from the edge of the manhole cover 1 to the center and the manhole 16 It will be unlocked at.

Therefore, the clasp actuating plate 3 releases the crimping as the downward movement and releases the locking as the rotary movement. As described above, the continuous rotation of the central bolt 4 after the crimping and locking is released does not allow any further rotation because the upper portion of the clamping operation plate 3 is raised to contact the upper end of the operation plate sleeve 5. And the meeting will be impossible.

 In order to make the locking device in the crimp unlocked state again, the locking device is rotated to the crimp locking position with the rotation key 22 and is in contact with the upper end of the operating plate sleeve 5. Is lowered without being rotated integrally with the central bolt (4), and if the lower plate does not contact the operating plate (3) sleeve (5) due to the lowering, the locking plate operating plate (3) is free without a fixed portion and only the center Since only the contact of the square thread with the bolt 4 is present, the lowering stops and the pivot key 22 rotates in the rotational direction of the central bolt 4, and the clamp 7 is as close to the edge of the manhole cover 1 as possible. By contacting the clamping post (6) and the clamping cradle (9) to the position where the locking blade (8) can be locked to the manhole frame 16, the rotation of the clamping plate (3) is no longer By not letting The rotation of the central bolt 4 causes the locking plate operating plate 3 to descend, and the crimping action takes place again by the principle of the lever, and the rotation of the pivoting key 22 and the central bolt 4 continues as described above. Compression lock is achieved as one.

  As described above, the manhole safety cover of the present invention includes a central bolt (4) and washer (15) inserted in the center of the manhole cover (1), three or three or more fasteners provided according to the manhole shape and the fasteners Equipped with the same number of fastener holder (9) and the adjustment bolt, and the fastener (7) and the fastener holder (9) can be mounted to the manhole frame (16) in a stable divided position And a clamping plate 3 to allow the manhole cover 1 and the manhole frame 16 to be crimped effectively, a clamping column 6 for limiting and guiding the movement of the clamping plate 7, and the clamping plate (3) accommodates the upper and lower movement guides and is attached to the lower portion of the operating plate sleeve (5) and the central bolt (4) for accommodating the upper portion of the central bolt (4) with the manhole cover (1) Composed of the surge spring 12 and the retainer 23 to prevent the bolt 4 from recurring do.

Manhole safety cover of the present invention as described above is inserted into the center of the manhole cover (1) and the manhole cover (1) the main bolt (4) and the central bolt (4) and the locking mechanism is coupled to the screw thread can be rotated An operating plate sleeve (5) for guiding the plate (3) and the clamping plate (3) and accommodating the upper portion of the central bolt (4) and the washer (15) together with the manhole cover (1); It is attached to the clamp (7) for mounting and closing function to guide the clamp and the clamp pillar (6) for guiding the clamp and the clamp holder (9) for mounting the clamp (7), and the lower portion of the central bolt (4) It consists of surge spring (12) and other fastening members to prevent recurrence to prevent the manhole cover (1) from falling off due to the traffic to prevent traffic accidents in advance and the manhole cover (1) and the manhole frame (16) Pedestrian lock due to the power of facilities inside the manhole by preventing leakage of rainwater into the manhole It is possible to prevent the transfer height and to prevent the noise of the manhole cover (1) due to the vehicle traffic, and to form a variety of shapes of the upper head of the central bolt (4), that is, the portion where the rotation key 22 is inserted (designated rotation key ( 22) It can not be opened without it. Especially, because of the specificity of the compression lock, the gap between the manhole cover 1 and the manhole frame 16 does not occur. .

Herein, another embodiment of the present invention will be described with reference to FIGS. 7 and 8.

Instead of the manhole cover (1), the inner plate 24 is further configured to be waterproof packing is attached to the edge, but the components of the locking device is attached to the inner plate (24) instead of the manhole cover (1) and the components are mounted By attaching the inner plate 24 to the manhole cover 1 as a fastening member, the components are more easily installed on the manhole cover 1 in the field without the inconvenience of replacing or carrying the manhole cover 1 of the existing manhole. Allow them to be mounted.

In addition, with reference to Figures 9 and 10 another embodiment of the present invention,

 The shock applied to the manhole cover 1 due to the traffic of the vehicle is transmitted to the clasp operating plate 3 through the central bolt 4 and also to the clasp 7 and the clasp holder 9. The clamping surge spring (10) in the clamp holder (9) for mounting the clamp (7) in order to prevent the reduction of the effect of the pressing lock by separating each of the components to maintain the mutually organically firm pressing lock state The spring stem 21 and the adjusting nut 19 together to form a tension while pressing the clamping surge spring 10 when the clamp 7 is crimped to the manhole frame 16, and the clamp is generated. The tension of the surge spring 10 is always applied to the clamp 7, the impact applied to the manhole cover 1 by the vehicle traffic to the central bolt (4), the clamp operating plate (3), the clamp (7) Reach when you reach The metal is further pressed against the clamping surge spring 10 while the clamping blade 8 is pressed against the manhole frame 16, thereby absorbing the shock while maintaining the pressing lock state and preventing damage to the components. The tension can be adjusted as the adjusting nut 19.

As described above, the technical idea of the present invention has been described in detail with reference to the above-described preferred embodiment, but it should be noted that the above embodiment is for understanding and not for limiting the present disclosure.

As mentioned above, this manhole safety cover is a manhole cover that is configured without a conventional locking device, which is displaced by traffic, frequently causing a large traffic accident, excessive noise, causing civil complaints, and manholes with excellent leakage. This flooding caused pedestrian electric shock due to power in the manhole, and it was easy to open other than the related person, which prevented the protection of facilities in the manhole.The central bolt was inserted in the center of the manhole cover and combined with the clasp operation plate and the thread. And to install the operation plate sleeve for smooth guide of the clasp operation plate to accommodate the upper part of the central bolt and the washer with the manhole cover, and to install the clasp on the clasp operation plate to be securely divided according to the manhole shape The clamp holder is also constructed with the clamp and It is possible to squeeze the manhole frame and manhole cover by attaching the clamping column to restrict and guide the copper, and to prevent the repetition of the central bolt with the surge spring, and the inner plate 24 is additionally configured to the existing manhole cover. It is a function that makes the installation of components easier, and also the clamping surge spring absorbs the impact of vehicle traffic on the manhole cover, protects the components, and maintains the crimp locking function. It prevents the occurrence of civil complaints by preventing the noise of the manhole cover and prevents the electric shock of pedestrian by the perfect waterproof effect of the manhole cover by the compression lock, which has higher manhole safety and security effect

Claims (8)

In the manhole cover which has the same shape as the manhole and seals the manhole at the top of the manhole frame:  A main body which is placed in the manhole frame and is provided with a through hole in a central portion thereof and a manhole cover to which various devices are attached;  It is attached to the bottom of the main body, A sleeve accommodating therein so as to be movable up and down the operating plate which is pivotally assembled with the bolt inserted into the through hole;  An operation plate provided at the bottom of the main body to engage the bolt inserted into the through hole with an internal thread and configured to be elevated in the sleeve when the bolt is rotated, and a predetermined portion of the operation plate provided to allow one side of the clamp to be mounted;  A predetermined protrusion provided on one side of the main body is provided between the manhole cover and the sleeve so as not to be separated and provided with a separate turning key to engage with the operation plate to rotate. A bolt for elevating the operation plate,  Drive means provided at a bottom of the main body and formed as a retainer and a nut at a predetermined portion of the bolt and configured to absorb shocks;  A fastener provided at a bottom of the main body to which one side portion is attached to a predetermined portion of the operation plate and the tile side portion is locked to the manhole frame;  Mounted on the bottom of the main body and provided so as to mount the clasp inside the cradle provided with an adjustment bolt to adjust the height of the mounting clamp; Locking means which is attached to the bottom of the main body adjacent to the lock and comprises a pillar for limiting and guiding the operation of the lock; The sleeve is mounted to the bottom of the body and accommodates the operation plate therein, the operation plate engages the bolt with an internal thread, and an upper head protrusion of the bolt is received between the body and the sleeve and one end of the clamp Is coupled to a predetermined portion of the operation plate, the mount is mounted to a predetermined portion of the bottom surface of the main body and the clamp is mounted therein, and the pillar is mounted adjacent to the clamp on the bottom of the main body, One side end of the bolt of the bottom of the manhole safety lid, characterized in that the elastic member is attached to the retainer and the nut is made so that the locking clamp is pressed into the manhole frame by the rotation of the pivoting key. According to claim 1, the bolt is provided with a plurality of threads to ensure stable rotation and the upper head is coupled to the rotation key and the concave-convex to open and close without a designated key, the bolt is provided with a predetermined protrusion and a plurality of nuts at one end Manhole safety cover consisting of a. 2. The manhole cover of claim 1, wherein the sleeve is mounted to the bottom of the manhole cover to accommodate the upper head of the central bolt and to guide the vertical movement of the clamping plate operating by the rotation of the bolt. The manhole safety lid according to claim 1, wherein the locking plate operating plate forms an internal thread to engage with the bolt, and a predetermined portion is provided so that three or three or more locks can be mounted. According to claim 1, wherein the locking portion is composed of a clamp, a clamp holder, a clamp pillar, the clamp is provided in plurality, one end is coupled to the clamp operation plate, the tile side end is in contact with the manhole frame, the clamp holder is attached to the body Mount the clamp and adjust the mounting height as the adjustment bolt, the clamp pillar is mounted adjacent to the clamp on the body,  The clasp clamps up and down and rotates by a clasp operation plate, and the clasp pillar restricts the rotational movement of the clasp so that the clasp acts as a locking action by the front and rear operation of the clasp, and also guides the vertical movement of the clasp. To enable the, the clasp holder is a manhole safety lid, characterized in that configured to enable the crimping lock of the final clamp by acting as a support point of the clamp. The manhole safety lid according to claim 1, wherein the surge spring is mounted to the lower part of the bolt, but is configured to prevent the bolt from being squeezed between the clamping operation plate and the retainer to maintain the compression lock and to protect the component by impact. . The method according to claim 1, wherein a support means is added between the main body and the components mounted on the bottom to attach the bottom parts to the support means, and the support means can be attached to the main body using only a predetermined fastening member. Manhole safety cover. The manhole safety lid according to claim 1, wherein the fastener holder mounts the elastic member to absorb the shock generated by the traffic of the vehicle with the elastic member to prevent damage to the components and to maintain the compression lock.

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