An internal safety net for preventing falls from municipal manhole covers

Abstract

This utility model discloses a built-in safety net for municipal manhole covers, comprising: multiple support sleeves evenly distributed circumferentially along the inner wall of the manhole below the manhole cover; an adjusting sleeve movably inserted into a circular insertion slot; a pin sleeve installed above the side surface of the adjusting sleeve; and an annular support plate with a support mesh plate installed on its upper interior, the upper surface of the support mesh plate aligned with the upper surface of the annular support plate, and a fall-prevention rope net installed on its lower interior. This utility model utilizes the elasticity of a lifting spring and the locking pin of a locking pin to ensure that if the manhole cover is lost, the annular support plate automatically rises under the action of the lifting spring to a position flush with the road surface. Its rapid response and high reliability ensure the safe passage of pedestrians and vehicles. The design of the support mesh plate takes on the function of the manhole cover, ensuring safety at the manhole opening after the cover is lost, while the fall-prevention rope net design increases safety redundancy.

Description

Technical Field

[0001] This utility model relates to the technical field of municipal roads, and in particular to a built-in safety net for preventing falls from municipal manhole covers. Background Technology

[0002] Municipal manhole covers are an important part of urban infrastructure, found throughout roads, sidewalks, and other public areas. However, due to theft, aging, improper construction, or vehicle traffic, missing or damaged manhole covers are common occurrences, creating deadly "urban traps" and posing a serious threat to the safety of pedestrians and vehicles. To address this problem, installing fall protection nets under manhole covers has become a common safety measure.

[0003] Existing fall protection nets mostly use the method of embedding expansion bolts into the well wall and then directly suspending the safety net on the bolts. Although this method is simple in structure, when the well cover is missing, the well opening is completely open. Even if the fall protection net can prevent pedestrians and vehicles from falling into the well, there is still a certain height difference between the fall protection net and the road surface, which still poses a threat to the safety of pedestrians and vehicles and presents a safety hazard. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a built-in safety net for preventing falls from municipal manhole covers.

[0005] The technical solution of this utility model to achieve the above objectives is a built-in safety net for preventing falls from municipal manhole covers, comprising: Support sleeves, in multiple quantities, are evenly distributed around the inner wall of the manhole in the manhole below the municipal manhole cover. A circular insertion groove is opened on the upper surface of the sleeves, and two anchoring holes are opened on the lower side surface of the sleeves. The two anchoring holes are arranged vertically side by side, and bolt holes are opened in the anchoring holes. Expansion bolts are installed below the side surface of the support sleeve and embedded in the manhole wall below the municipal manhole cover. The countersunk bolts on them pass through the bolt holes and are inserted into the anchoring holes, and the nuts on them are installed in the anchoring holes. The adjusting sleeve is movably inserted into the circular insertion slot. An adjusting square post is slidably inserted into its upper end. The upper end of the adjusting square post has a threaded hole. The lower end of the adjusting square post is a supporting frustum, which slides in contact with the inner wall of the adjusting sleeve. A pin hole is opened below the side surface of the supporting frustum. A lifting spring is installed inside the lower part of the supporting frustum. The upper end of the lifting spring is in contact with the supporting frustum. A locking pin sleeve is installed above the side surface of the adjusting sleeve and is connected to the adjusting sleeve. A locking pin is set inside the sleeve. One end of the locking pin is inserted into the adjusting sleeve, and the end face of this end is a transition spherical surface. The other end of the locking pin extends out of the locking pin sleeve and is equipped with an unlocking rope. A spring baffle is set on the locking pin, and a locking spring is fitted on the locking pin. The locking spring is located between the spring baffle and the inner wall of the locking pin sleeve. A ring-shaped support plate is installed below the manhole cover and in contact with the lower surface of the manhole cover. A support mesh plate is installed inside the upper part of the ring-shaped support plate, and the upper surface of the support mesh plate is aligned with the upper surface of the ring-shaped support plate. A fall-prevention rope net is installed inside the lower part of the ring-shaped support plate. T-shaped studs are evenly distributed on the lower surface of the annular support plate. The lower end of the studs is threaded into the threaded hole of the adjusting square column, and the upper end of the studs is rotatably embedded in the corresponding groove on the lower surface of the annular support plate. An adjustment groove is opened at the center of the upper surface of the support mesh plate, and an unlocking rope hole is opened at the center of its lower surface. A pull ring seat is installed inside the groove, and an unlocking rope two is installed on the lower surface of the pull ring seat. The unlocking rope two passes through the unlocking rope hole and is inserted into the lower part of the support mesh plate, extending downwards towards the fall protection net. A connecting seat is installed at the lower end of the unlocking rope two, and the connecting seat is connected to the unlocking rope one. The sum of the elastic forces of the multiple lifting springs is less than the weight of the municipal manhole cover.

[0006] Furthermore, the amount of expansion and contraction of the adjusting column within the adjusting sleeve is the same as the thickness of the well cover.

[0007] Furthermore, after the weight of the municipal manhole cover disappears, the annular support plate and the support mesh plate gradually rise using the elasticity of the lifting spring, making the upper surface of the annular support plate flush with the road surface.

[0008] Furthermore, the locking pin utilizes the elastic force of the locking spring to make its spherical end fit tightly against the adjusting square column, and during the upward movement of the adjusting square column, the inclined surface of the supporting frustum allows the locking pin to retract and adjust to rest on the outer surface of the supporting frustum.

[0009] Furthermore, when the annular support plate is flush with the road surface, the locking pin is inserted into the pin hole by the elastic force of the locking spring.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. Utilizing the lifting spring force and locking pin, the ring support plate automatically rises to a level with the road surface after the manhole cover is lost, requiring no external power and exhibiting rapid response and high reliability, ensuring the safe passage of pedestrians and vehicles.

[0011] 2. The design of the supporting mesh plate takes on the function of the manhole cover to ensure the safety of the manhole opening in the event of the manhole cover being missing. At the same time, the design of the anti-fall rope net improves the overall safety redundancy and ensures the anti-fall effect.

[0012] 3. The design of the pull ring seat, unlocking rope one and unlocking rope two allows the locking pin to be unlocked simultaneously, so as to quickly contact the locking of the ring support plate and facilitate the quick reset of the ring support plate. It is simple and convenient to use.

[0013] 4. By using the support sleeve to support the adjusting sleeve, the stability of the annular support plate can be ensured, and the annular support plate can be quickly disassembled, so as to facilitate the operation of personnel going down into the well and improve its practicality.

[0014] 5. By utilizing the threaded engagement of the adjusting square post and the T-shaped stud, the installation accuracy of the support sleeve can be reduced, making the installation of the support sleeve easier and providing stable support for the annular support plate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a built-in safety net for preventing falls from municipal manhole covers, as described in this utility model. Figure 2 This is a cross-sectional view of the support sleeve described in this utility model; Figure 3 This is a cross-sectional view of the adjusting sleeve described in this utility model; Figure 4 This utility model describes Figure 3 A schematic diagram showing the locked central adjustment column; Figure 5 This is a cross-sectional view of the annular support plate described in this utility model; In the picture: 1. Support sleeve; 11. Circular insertion slot; 12. Anchor hole; 13. Bolt hole; 2. Expansion bolt; 3. Adjusting sleeve; 31. Adjusting square column; 311. Threaded hole; 312. Support truncated cone; 313. Pin hole; 32. Lifting spring; 4. Pin sleeve; 41. Locking pin; 411. Spring baffle; 412. Locking spring; 42. Unlocking rope one; 5. Annular support plate; 51. Support mesh plate; 52. Fall protection rope net; 6. T-screw; 7. Adjusting groove; 71. Unlocking rope hole; 72. Pull ring seat; 721. Unlocking rope two; 722. Connecting seat. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides a technical solution, such as Figures 1-5As shown; a built-in safety net for preventing falls in municipal manhole covers includes: a support sleeve 1, which is evenly distributed along the inner wall of the manhole below the municipal manhole cover. The upper surface of the support sleeve has a circular insertion groove 11, and the lower side surface of the support sleeve has two anchoring holes 12, which are arranged vertically side by side. The anchoring holes 12 have bolt holes 13. An expansion bolt 2 is set on the lower side surface of the support sleeve and embedded in the manhole wall below the municipal manhole cover. The countersunk bolt on the expansion bolt 2 passes through the bolt hole 13 and is inserted into the anchoring hole 12. The nut on the expansion bolt 2 is set in the anchoring hole 12. In this embodiment of the utility model, the expansion bolts 2 are used to evenly install the support sleeve 1 onto the inner wall of the wellhead. The circular insertion slot 11 allows for convenient and quick installation of the device into the wellhead. At the same time, the device can be quickly moved away during downhole operations, thus improving the practicality of the device.

[0018] In this embodiment of the invention, the support sleeve 1 is evenly distributed along the circumference of the inner wall of the well opening, increasing the number of support points of the device to ensure that the device can be stably supported at the well opening after the well cover is lost, thus ensuring the stability of the support.

[0019] Adjusting sleeve 3 is movably inserted into circular insertion slot 11. An adjusting square post 31 is slidably inserted into its upper end. The upper end of the adjusting square post 31 has a threaded hole 311. The lower end of the adjusting square post 31 is a supporting frustum 312, which slides in contact with the inner wall of the adjusting sleeve 3. A pin hole 313 is opened below the side surface of the supporting frustum 312, and a lifting spring 32 is installed inside it. The upper end of the lifting spring 32 contacts the supporting frustum 312. Pin sleeve 4 is installed above the side surface of the adjusting sleeve 3 and... The adjusting sleeve 3 is connected, and a locking pin 41 is set inside it. One end of the locking pin 41 is inserted into the adjusting sleeve 3, and the end face of this end is a transition spherical surface. The other end of the locking pin 41 extends out of the pin sleeve 4 and is equipped with an unlocking rope 42. A spring baffle 411 is set on the locking pin 41, and a locking spring 412 is fitted on the locking pin 41. The locking spring 412 is located between the spring baffle 411 and the inner wall of the pin sleeve 4. The sum of the elastic forces of the multiple lifting springs 32 is less than the weight of the municipal manhole cover.

[0020] In this embodiment of the utility model, the sum of the elastic forces of multiple lifting springs 32 is less than the weight of the municipal manhole cover, so that when the municipal manhole cover is closed, the annular support plate 5 and the support mesh plate 51 can be pressed down by the municipal manhole cover, so as to ensure the smooth opening and closing of the municipal manhole cover and avoid adverse effects on the opening and closing of the municipal manhole cover.

[0021] In this embodiment of the utility model, the elastic force of the lifting spring 32 is used to enable the annular support plate 5 and the support mesh plate 51 to rise quickly after the municipal manhole cover is lost, thereby supporting the manhole opening and achieving the function of the manhole cover, ensuring the safe passage of pedestrians and vehicles, and improving the safety and anti-fall effect.

[0022] In this embodiment of the invention, the transition spherical surface of the insertion end of the locking pin 41 and the elastic force of the locking spring 412 are used to ensure that when the lifting spring 32 pushes the adjusting column 31 upward, the locking pin 41 is always pressed against the outer surface of the adjusting column 31. At the same time, the setting of the supporting frustum 312 causes the locking pin 41 to be compressed by the inclined surface of the supporting frustum 312, so as to ensure that the locking pin 41 can be smoothly inserted into the pin hole 313, locking the height of the adjusting column 31, thereby ensuring that the device is stably supported at the wellhead.

[0023] In this embodiment of the utility model, by using the unlocking rope 42, the adjusting column 31 can be quickly unlocked by pulling the unlocking rope 42, so as to quickly reset the annular support plate 5 and allow the manhole cover to be quickly placed on the manhole.

[0024] In this embodiment of the utility model, the threaded connection between the threaded hole 311 and the T-shaped stud 7 allows the operator to quickly adjust the distance between the adjustable square post 31 and the annular support plate 5 according to the actual situation, avoiding the instability caused by different installation heights of the support sleeve 1, thereby reducing the installation accuracy and difficulty of the support sleeve 1.

[0025] An annular support plate 5 is positioned below the manhole cover and contacts the lower surface of the manhole cover. A support mesh plate 51 is installed on its upper interior, with the upper surface of the support mesh plate 51 aligned with the upper surface of the annular support plate 5. A fall arrest rope net 52 is installed on its lower interior. T-shaped studs 6 are evenly distributed on the lower surface of the annular support plate 5. Their lower ends are threaded into the threaded holes 311 of the adjusting square post 31, and their upper T-shaped heads are rotatably embedded in the corresponding grooves on the lower surface of the annular support plate 5. An adjusting groove 7 is opened at the center of the upper surface of the support mesh plate 51, and an unlocking rope hole 71 is opened at the center of its lower surface. A pull ring seat 72 is installed inside the groove, and an unlocking rope 721 is installed on the lower surface of the pull ring seat 72. The unlocking rope 721 passes through the unlocking rope hole 71 and is inserted below the support mesh plate 51, extending below the fall arrest rope net 52. A connecting seat 722 is installed at the lower end of the unlocking rope 721, and the connecting seat 722 is connected to the unlocking rope 42.

[0026] In this embodiment of the utility model, the supporting mesh plate 51 is made of high-strength structural steel to improve its own strength, while ensuring the number of mesh holes on it. This allows the supporting mesh plate 51 to stably support the manhole opening after the manhole cover is lost, thus ensuring the safe passage of pedestrians and vehicles. At the same time, the supporting mesh plate 51 is treated with rust prevention to improve its service life.

[0027] In this embodiment of the invention, the use of the fall-prevention rope net 52 improves the overall safety redundancy and ensures the fall prevention effect.

[0028] In this embodiment of the utility model, the pull ring seat 72 allows workers to quickly unlock the adjusting column 31. By pulling the pull ring on the pull ring seat 72, the worker can use the unlocking rope 2 721 to drive the connecting seat 722 to rise. The connecting seat 722 then drives the unlocking rope 1 42 to move upward, causing the unlocking rope 1 42 to slide outward and separate from the supporting truncated cone 312. This unlocks the device, allowing workers to quickly reset the annular support plate 5 and the support mesh plate 51 by pressing or stepping on them, ensuring that the manhole cover can be smoothly installed.

[0029] In this invention, the extension and retraction of the adjusting column 31 within the adjusting sleeve 3 is the same as the thickness of the manhole cover; this ensures that after the device is installed, if the manhole cover is lost, the annular support plate 5 and the support mesh plate 51 can rise to be flush with the road surface, thus ensuring the safe passage of pedestrians and vehicles.

[0030] In this invention, after the weight of the municipal manhole cover disappears, the ring support plate 5 and the support mesh plate 51 gradually rise using the elasticity of the lifting spring 32, and make the upper surface of the ring support plate 5 flush with the road surface; thus avoiding a height difference between the road surface and the support position at the manhole, allowing pedestrians and vehicles to pass smoothly above the manhole.

[0031] In this invention, the locking pin 41 utilizes the elastic force of the locking spring 412 to make its spherical end fit tightly against the adjusting column 31. During the upward movement of the adjusting column 31, the inclined surface of the supporting frustum 312 is used to allow the locking pin 41 to retract and adjust against the outer surface of the supporting frustum 312, ensuring that the locking pin 41 can smoothly lock the adjusting column.

[0032] In this utility model, when the annular support plate 5 is flush with the road surface, the locking pin 41 is inserted into the pin hole 313 by the elastic force of the locking spring 412; the insertion and locking of the locking pin 41 ensures the stability of the annular support plate 5 and the support mesh plate 51.

[0033] When using this utility model, if the device needs to be installed inside the wellhead: Step 1: The staff first opens the manhole cover and goes down into the manhole. Then, they place the device into the manhole and align the annular support plate 5 with the road surface. Then, the staff in the manhole put the support sleeves 1 one by one onto the adjusting sleeves 3 and locate the installation position of the support sleeves 1. Then, the device can be moved out of the manhole. Step 2: The staff can then drill holes at the installation position of the support sleeve 1, and after the holes are drilled, use the expansion bolts 2 to install the support sleeve 1 onto the inner wall of the wellhead, so that the support sleeve 1 is evenly distributed along the circumference of the wellhead. Step 3: The operator places the device into the wellhead and inserts the adjusting sleeves 3 one by one into the circular insertion slots 11 on the support sleeve 1. Then, the operator removes the leveling pool and adjusts the lower end height of the adjusting sleeves 3 by rotating the T-screws 6 one by one, screwing the T-screws 6 into or out of the threaded holes 311. The operator measures the protruding height of the adjusting sleeves 3 to determine whether the adjusting sleeves 3 are in contact with the bottom of the circular insertion slots 11. After the T-screws 6 are adjusted, the operator removes the device from the wellhead, allowing the downhole operator to climb out of the wellhead. The device can then be reinstalled into the wellhead. Step 4: The worker manually pulls the ring on the ring seat 72 upwards, using the unlocking rope 2 721 and unlocking rope 1 42 to move the locking pin 41 outwards and unlock the adjusting column 3. Then, the worker uses a counterweight to press down on the support mesh plate 51, causing the annular support plate 5 to descend to its lowest height. Then, the worker puts the manhole cover on, and while putting the manhole cover on, quickly pulls away the counterweight and quickly puts the manhole cover on the manhole opening. Then, using the weight of the manhole cover, the annular support plate 5 and the support mesh plate 51 are pressed down under the manhole cover.

[0034] When the manhole cover is lost, the pressure on the annular support plate 5 and the support mesh plate 51 disappears. The lifting spring 32 uses its own elasticity to push the support truncated cone 312 to rise, so that the adjusting square column 31 gradually rises and pushes the annular support plate 5 to rise through the T-shaped stud 7 until the annular support plate 5 and the support mesh plate 51 rise to the highest height. At this time, the annular support plate 5 and the support mesh plate 51 are aligned with the road surface. During the upward movement of the adjusting column 31, the locking pin 41 contracts under the pressure of the supporting frustum 312, pressing against the outer surface of the supporting frustum 312. When the annular support plate 5 and the supporting mesh plate 51 rise to their highest height, the locking pin 41 aligns with the pin hole 312. The elasticity of the locking spring 412 allows the locking pin 41 to be inserted into the pin hole 312, thereby locking the adjusting column 312. This ensures that the annular support plate 5 and the supporting mesh plate 51 provide a stable support platform at the wellhead, allowing pedestrians and vehicles to pass safely above the wellhead.

[0035] When the manhole cover is reinstalled at the manhole opening, the staff can follow step four of the above operation to put the manhole cover back on the manhole opening.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A built-in safety net for preventing falls from municipal manhole covers, characterized in that, include: Support sleeves, in multiple quantities, are evenly distributed around the inner wall of the manhole in the manhole below the municipal manhole cover. A circular insertion groove is opened on the upper surface of the sleeves, and two anchoring holes are opened on the lower side surface of the sleeves. The two anchoring holes are arranged vertically side by side, and bolt holes are opened in the anchoring holes. Expansion bolts are installed below the side surface of the support sleeve and embedded in the manhole wall below the municipal manhole cover. The countersunk bolts on them pass through the bolt holes and are inserted into the anchoring holes, and the nuts on them are installed in the anchoring holes. The adjusting sleeve is movably inserted into the circular insertion slot. An adjusting square post is slidably inserted into its upper end. The upper end of the adjusting square post has a threaded hole. The lower end of the adjusting square post is a supporting frustum, which slides in contact with the inner wall of the adjusting sleeve. A pin hole is opened below the side surface of the supporting frustum. A lifting spring is installed inside the lower part of the supporting frustum. The upper end of the lifting spring is in contact with the supporting frustum. A locking pin sleeve is installed above the side surface of the adjusting sleeve and is connected to the adjusting sleeve. A locking pin is set inside the sleeve. One end of the locking pin is inserted into the adjusting sleeve, and the end face of this end is a transition spherical surface. The other end of the locking pin extends out of the locking pin sleeve and is equipped with an unlocking rope. A spring baffle is set on the locking pin, and a locking spring is fitted on the locking pin. The locking spring is located between the spring baffle and the inner wall of the locking pin sleeve. A ring-shaped support plate is installed below the manhole cover and in contact with the lower surface of the manhole cover. A support mesh plate is installed inside the upper part of the ring-shaped support plate, and the upper surface of the support mesh plate is aligned with the upper surface of the ring-shaped support plate. A fall-prevention rope net is installed inside the lower part of the ring-shaped support plate. T-shaped studs are evenly distributed on the lower surface of the annular support plate. The lower end of the studs is threaded into the threaded hole of the adjusting square column, and the upper end of the studs is rotatably embedded in the corresponding groove on the lower surface of the annular support plate. An adjustment groove is opened at the center of the upper surface of the support mesh plate, and an unlocking rope hole is opened at the center of its lower surface. A pull ring seat is installed inside the groove, and an unlocking rope two is installed on the lower surface of the pull ring seat. The unlocking rope two passes through the unlocking rope hole and is inserted into the lower part of the support mesh plate, extending downwards towards the fall protection net. A connecting seat is installed at the lower end of the unlocking rope two, and the connecting seat is connected to the unlocking rope one. The sum of the elastic forces of the multiple lifting springs is less than the weight of the municipal manhole cover.

2. The built-in safety net for preventing falls from municipal manhole covers according to claim 1, characterized in that, The expansion and contraction of the adjusting column within the adjusting sleeve is the same as the thickness of the well cover.

3. The built-in safety net for preventing falls from municipal manhole covers according to claim 1, characterized in that, The locking pin utilizes the elastic force of the locking spring to make its spherical end fit tightly against the adjusting square column. During the upward movement of the adjusting square column, the inclined surface of the supporting frustum allows the locking pin to retract and adjust to rest against the outer surface of the supporting frustum.

4. The built-in safety net for preventing falls from municipal manhole covers according to claim 1, characterized in that, After the weight of the municipal manhole cover disappears, the annular support plate and the support mesh plate gradually rise using the elasticity of the lifting spring, making the upper surface of the annular support plate flush with the road surface.

5. The built-in safety net for preventing falls from municipal manhole covers according to claim 1, characterized in that, When the annular support plate is flush with the road surface, the locking pin is inserted into the pin hole by the elastic force of the locking spring.

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