Steel fiber reinforced concrete safety manhole cover

Abstract

The utility model relates to a kind of steel fiber reinforced concrete safety well lid, including support seat, outer well lid and inner well lid, the outer well lid is set on first installation step, first shock pad ring is arranged between the outer well lid and first installation step;The inner well lid is set on second installation step, the outer well lid and inner well lid are in up and down distribution;First installation step and second installation step are in ladder distribution on the inner edge of the support seat;Buffering support piece is connected between the outer well lid and inner well lid.The utility model is by ladder type double-step bearing, energy consumption of elastic washer and the triple protection of linkage buffering support piece, convert concentrated load into gradient distribution force, realize stress efficient dispersion, reduce the failure risk of well lid due to stress concentration, significantly prolong the overall life of well lid.

Description

Technical Field

[0001] This utility model relates to the field of manhole cover technology, and in particular to a steel fiber reinforced concrete safety manhole cover. Background Technology

[0002] As the core maintenance access for underground pipeline facilities, manhole covers must ensure long-term sealing and stability. Traditional flat manhole covers exhibit the following structural defects under the continuous load of vehicle traffic and pedestrians: 1. Deformation failure: The central area of ​​the manhole cover, lacking supporting structure, is prone to plastic subsidence; simultaneously, the edge areas warp upwards under reaction forces, resulting in uneven gaps at the contact surface between the cover and the base; 2. Safety risks: Severe deformation can lead to misalignment between the cover and the base, posing a risk of collapse or overturning, threatening the safety of road users.

[0003] For example, Chinese utility model patent with publication number CN206457853U discloses a steel fiber reinforced concrete manhole cover, including a manhole cover base and a manhole cover hinged thereon. The manhole cover is circular, and several fasteners are arranged circumferentially below it. The manhole cover base is a hollow conical structure with an inclined outer wall and a vertical inner wall. An installation platform is provided at the upper end of the inner wall, and several fixing countersunk holes are evenly arranged on the installation platform. The fasteners are fixed in cooperation with the fixing countersunk holes. When the manhole cover is subjected to load, the load is mainly transmitted through the installation platform, which leads to stress concentration in this area and is prone to local deformation or even breakage of the installation platform and the manhole cover. Utility Model Content

[0004] The purpose of this invention is to provide a steel fiber reinforced concrete safety manhole cover to solve the problems mentioned in the background art.

[0005] The above-mentioned objective of this utility model is achieved through the following technical solution: a steel fiber reinforced concrete safety manhole cover, including a support base, an outer manhole cover and an inner manhole cover, wherein the outer manhole cover is disposed on a first installation step, and a first shock-absorbing washer is disposed between the outer manhole cover and the first installation step;

[0006] The inner manhole cover is installed on the second installation step, and the outer manhole cover and the inner manhole cover are distributed vertically.

[0007] The first and second mounting steps are distributed in a stepped manner on the inner edge of the support base;

[0008] A buffer support is connected between the outer manhole cover and the inner manhole cover.

[0009] Preferably, the buffer support includes a movable support column fixed on the outer manhole cover and a fixed support column fixed on the inner manhole cover, wherein the movable support column and the fixed support column are sleeved together and a support spring is connected between them.

[0010] Preferably, both the upper end of the movable support column and the lower end of the fixed support column are provided with support plates.

[0011] Preferably, the movable support column is provided with a limiting ring, which is located above the upper end of the fixed support column.

[0012] Preferably, the sidewalls of both the first and second mounting steps are inclined surfaces.

[0013] Preferably, a second shock-absorbing washer is provided between the outer side of the inner manhole cover and the inclined sidewall of the first mounting step.

[0014] Preferably, the lower surface of the outer manhole cover is an upwardly arched arc surface, the thickness of the outer manhole cover decreases from the outside to the center, and the buffer support is located at the highest point of the arc surface.

[0015] Preferably, an annular support portion is formed between the outer side surface of the outer manhole cover and the edge of the arc surface.

[0016] The beneficial effects of this utility model are:

[0017] This invention utilizes a triple protection system of stepped double-step load bearing, elastic washer energy dissipation, and linkage buffer support to transform concentrated loads into gradient distributed forces, achieving efficient stress dispersion, reducing the risk of manhole cover failure due to stress concentration, and significantly extending the overall lifespan of the manhole cover. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the manhole cover in an embodiment of this utility model;

[0019] Figure 2 This is an exploded view of the manhole cover in an embodiment of this utility model;

[0020] Figure 3 This is a cross-sectional view of the manhole cover in an embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional view of the buffer support member in an embodiment of this utility model;

[0022] In the diagram: 1-Support base, 101-First mounting step, 102-Second mounting step, 103-Inclined sidewall, 2-Outer manhole cover, 201-Arc surface, 202-Annular support part, 3-Inner manhole cover, 4-Buffer support component, 401-Fixed support column, 402-Modible support column, 403-Support spring, 404-Support plate, 405-Limiting retaining ring, 5-First shock-absorbing washer, 6-Second shock-absorbing washer. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings.

[0024] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present utility model.

[0025] Example:

[0026] like Figure 1 and Figure 2 As shown, this embodiment provides a steel fiber reinforced concrete safety manhole cover, including: a support base 1, an outer manhole cover 2, an inner manhole cover 3, and a buffer support 4.

[0027] like Figure 3 As shown, the support base 1 is made of high-strength reinforced concrete prefabricated. Its inner edge is processed with a first installation step 101 and a second installation step 102 distributed in a stepped manner. The side walls of the two steps are inclined surfaces that slope outward and downward.

[0028] The outer manhole cover 2 is made of steel fiber reinforced concrete, and its lower surface is designed as an upwardly arched arc surface 201, with the thickness decreasing from the outside to the center. A sturdy annular support 202 is formed between the outer side of the outer manhole cover 2 and the edge of the arc surface 201. The outer manhole cover 2 is placed on the first mounting step 101 of the support base 1 through its annular support 202. A first shock-absorbing washer 5 made of rubber is embedded between the contact surface of the annular support 202 and the first mounting step 101.

[0029] The inner manhole cover 3 is also made of steel fiber reinforced concrete and is flat or slightly arched. The inner manhole cover 3 is placed on the second mounting step 102 of the support base 1, directly below the outer manhole cover 2. A second rubber shock-absorbing washer 6 is embedded between the outer edge of the inner manhole cover 3 and the inclined side wall 103 of the first mounting step 101.

[0030] like Figure 4 As shown, the outer manhole cover 2 and the inner manhole cover 3 are connected by a buffer support 4. The buffer support 4 specifically includes: a fixed support column 401 fixed on the upper surface of the inner manhole cover 3; a movable support column 402 fixed at the center of the lower surface of the outer manhole cover 2 (i.e., the highest point of the arc surface 201); and a support spring 403 connecting the movable support column 402 and the fixed support column 401.

[0031] A circular support plate 404 is welded to the upper end of the fixed support column 401 and the lower end of the movable support column 402. The support plate 404 is fixed by bolts pre-embedded in the outer manhole cover 2 and the inner manhole cover 3.

[0032] On the movable support column 402, above the upper port of the fixed support column 401, a limiting ring 405 is welded to limit the downward displacement of the outer manhole cover 2 and the movable support column 402.

[0033] The vehicle load is first applied to the outer manhole cover 2. The arched structure of the outer manhole cover 2 effectively disperses the load, improving its load-bearing capacity and resistance to deformation. The impact force is transmitted to the first mounting step 101 through the annular support 202, and the first shock-absorbing washer 5 absorbs most of the impact vibration and noise.

[0034] When the impact is significant, the outer manhole cover 2 presses down, pushing the movable support column 402 downward and compressing the support spring 403. The spring 403 deforms to absorb energy, providing cushioning, and transfers part of the load downward to the inner manhole cover 3. The inner manhole cover 3 then transfers the load to the inclined sidewall 103 of the first mounting step 101 and the support base 1 itself through the second damping washer 6. The second damping washer 6 further absorbs vibration and prevents the inner manhole cover 3 from colliding.

Claims

1. A steel fiber reinforced concrete safety manhole cover, comprising a support base (1), an outer manhole cover (2), and an inner manhole cover (3), characterized in that: The outer manhole cover (2) is installed on the first installation step (101), and a first shock-absorbing washer (5) is provided between the outer manhole cover (2) and the first installation step (101). The inner manhole cover (3) is installed on the second installation step (102), and the outer manhole cover (2) and the inner manhole cover (3) are distributed vertically. The first mounting step (101) and the second mounting step (102) are distributed in a stepped manner on the inner edge of the support base (1); A buffer support (4) is connected between the outer manhole cover (2) and the inner manhole cover (3).

2. The steel fiber reinforced concrete safety manhole cover according to claim 1, characterized in that: The buffer support (4) includes a movable support column (402) fixed on the outer well cover (2) and a fixed support column (401) fixed on the inner well cover (3). The movable support column (402) is sleeved with the fixed support column (401) and a support spring (403) is connected between them.

3. A steel fiber reinforced concrete safety manhole cover according to claim 2, characterized in that: The upper end of the movable support column (402) and the lower end of the fixed support column (401) are both provided with support plates (404).

4. A steel fiber reinforced concrete safety manhole cover according to claim 3, characterized in that: The movable support column (402) is provided with a limiting ring (405), which is located above the upper end of the fixed support column (401).

5. A steel fiber reinforced concrete safety manhole cover according to claim 1, characterized in that: The sidewalls of the first mounting step (101) and the second mounting step (102) are both inclined surfaces.

6. A steel fiber reinforced concrete safety manhole cover according to claim 5, characterized in that: A second shock-absorbing washer (6) is provided between the outer side of the inner manhole cover (3) and the inclined sidewall (103) of the first mounting step (101).

7. A steel fiber reinforced concrete safety manhole cover according to claim 1, characterized in that: The lower surface of the outer manhole cover (2) is an upward-arched arc surface (201), and the thickness of the outer manhole cover (2) decreases from the outside to the center. The buffer support (4) is located at the highest point of the arc surface (201).

8. A steel fiber reinforced concrete safety manhole cover according to claim 7, characterized in that: An annular support (202) is formed between the outer side of the outer manhole cover (2) and the edge of the arc surface (201).

Images