Bolt-assembled reinforced edge-supported variable-cross-section steel-concrete light combined cover plate
Through the steel-concrete combined structure and variable cross-section design, combined with bolt assembly, edge support and rubber pad coverage are strengthened, the damage and acoustic pollution of the power cover plate are solved, and efficient edge bearing capacity and structural stiffness are improved, reducing maintenance costs.
Patent Information
- Application Number
- CN202421030169.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-13
AI Technical Summary
Existing power covers are prone to damage due to vehicle impact and fatigue, resulting in high maintenance costs, and gaps between traditional manhole covers lead to damage to edges and acoustic contamination.
Adopt a steel-concrete combination structure, including high-strength concrete filling and variable-section rolled steel grille, the steel grille is designed to increase bending stiffness, and edge support and connection are strengthened by bolt assembly, and rubber pads are used to cover the connection to prevent dust. and rainwater effects.
The self-weight reduction is achieved by 70%, improving the load-bearing capacity and edge bearing capacity, reducing the collision damage and acoustic pollution of manhole covers, the economic cost is close to that of steel fiber concrete covers, and the structural stiffness and bearing capacity are improved.
Smart Images
Figure CN222252227U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of manhole covers, and in particular relates to a variable-section steel-concrete light composite cover plate assembled by bolts to strengthen edge support. Background Art
[0002] As the entrance for cable construction, operation and maintenance, power covers are widely distributed in cities; according to statistics, the number of power covers in the country has exceeded 6 billion. At present, power covers are mainly divided into: cast iron, steel fiber concrete and resin covers; among them, steel fiber concrete covers are the most widely used; due to vehicle impact, fatigue and other effects, the problem of concrete cover damage is more prominent. According to statistics, the number of concrete power covers replaced in my country reaches more than 10 million per year, and the maintenance cost is huge. In addition, traditional manhole covers are independent of each other and have gaps. When vehicles pass by, the manhole covers collide with each other, resulting in serious damage to the edges and noise pollution. Therefore, the development of a new type of lightweight and high-performance combined power cover is of great significance to improving the safe operation and maintenance level of the power system and reducing the later operating costs.
[0003] The new bolt-assembled reinforced edge support variable-section steel-concrete lightweight composite cover plate adopts a steel-concrete composite structure. The upper part of the specimen is filled with high-strength concrete, and the lower part is a variable-section rolled steel grille. Concrete is arranged in the compression zone, and the steel structure is in the tension zone, which can give full play to the stress characteristics of the two materials. The steel grille adopts a single-side curling design, one is for the convenience of molding, and the other is to increase the bending stiffness to achieve the purpose of improving the bearing capacity. When replacing the manhole cover, the edge height is fixed, resulting in insufficient edge bearing capacity of the variable-section composite cover plate. Therefore, edge support is set to improve the edge bearing capacity of the composite cover plate. The cover plate adopts a variable-section design as a whole. Compared with the traditional concrete cover plate, the self-weight of the new composite cover plate is reduced by 70%. Under the premise that the bearing capacity meets the requirements of the specification, the economic cost is basically the same as that of the steel fiber concrete cover plate; it has good engineering application value. Bolt connection is used between the manhole covers to enhance the integrity of the manhole covers, effectively solving the damage and sound pollution caused by the collision of the edges of the traditional manhole covers. At the same time, the connection parts are covered with rubber pads to prevent the influence of dust and rain. Utility Model Content
[0004] The utility model aims to provide a variable-section steel-concrete light composite cover plate assembled with bolts to strengthen edge support, so as to solve the above-mentioned problems.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a bolt-assembled reinforced edge support variable-section steel-concrete light composite cover plate, comprising two side panels one and two side panels two, the two side panels one and the side panels two are welded and fixed to form a rectangle, the bottom of the side panel two is fixedly connected with an edge bottom plate, the edge bottom plate is fixedly connected with an edge plate and the edge plate is arranged on the inner side of the side panel two, one side of the edge plate is fixedly connected with the side panel one and the other side is fixedly connected with the edge panel two, the two sides of the edge panel two are respectively fixedly connected with the inner sides of the two side panels one and a middle main beam is fixedly connected between the two edge panels two, a partition plate is arranged on the middle main beam, a bottom plate two is fixedly arranged on the side panel one, the side panel two and the bottom of the middle main beam, the top of the middle main beam between the two side panels one is fixedly connected with the bottom plate, and an edge support is arranged at the bottom of the bottom plate two.
[0006] Preferably, the outer side of the partition plate is fixedly connected to the side plate, and the bottom plate is placed between two bottom plates to form a plane and concrete is poured thereon.
[0007] Preferably, both ends of the bent portion of the upper portion of the side plate are provided with hanging holes, and a groove is provided at the bent portion of the upper portion of the side plate at the location where the stress is minimal.
[0008] Preferably, it also includes bolts, bolt holes and rubber pads, the interior of the groove is connected with bolts, the bolts pass through preset bolt holes, and the upper part of the groove is covered with a rubber pad.
[0009] The technical effects and advantages of the utility model are as follows: the structure of the utility model can realize the use of a steel-concrete composite structure, the upper part of the specimen is filled with high-strength concrete, and the lower part is a variable-section rolled steel grille; the concrete is arranged in the compression zone, and the steel structure is in the tension zone, which can give full play to the stress characteristics of the two materials; the manhole cover adopts a variable-section form, and compared with the traditional concrete cover, the deadweight of the new composite cover is reduced by 70%; the steel grille adopts a rolled design, one is for the convenience of molding, and the other is to increase the bending stiffness to achieve the purpose of improving the bearing capacity; edge supports are set on the edges to improve the edge bearing capacity and prevent the edge bearing capacity from being insufficient due to the fixed edge height when the manhole cover is replaced; a slot-shaped bolt connection method is proposed to solve the problem that traditional manhole covers are independent of each other, there are gaps on the edges, and the edge damage and sound pollution caused by the collision of the manhole covers when vehicles pass by; rubber pads are used to cover the connection parts to prevent the influence of rain and dust. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a connection elevation view of a steel-concrete lightweight composite cover plate of the utility model;
[0011] Figure 2 It is a side view of a steel-concrete light composite cover plate of the utility model;
[0012] Figure 3 It is a top view of a steel-concrete light composite cover plate of the utility model;
[0013] Figure 4 This is a bottom view of a steel-concrete light composite cover plate of the utility model;
[0014] Figure 5 It is a top view of a steel grille of a steel-concrete light composite cover plate of the utility model;
[0015] Figure 6 It is a transverse cross-sectional view of a steel grille of a steel-concrete light composite cover plate of the utility model;
[0016] Figure 7 It is a longitudinal cross-sectional view of a steel grille of a steel-concrete light composite cover plate of the utility model;
[0017] Figure 8 This is a connection diagram of two plates in a steel-concrete light composite cover plate of the utility model;
[0018] Fig. 9 This is a connection elevation view of a steel-concrete lightweight composite cover plate of the utility model;
[0019] Fig.10 This is a top view of a steel-concrete lightweight composite cover plate of the utility model;
[0020] Fig.11 This is a connection detail diagram of a steel-concrete light composite cover plate of the utility model;
[0021] Fig.12 It is an experimental load-deflection curve diagram of a steel-concrete light composite cover plate of the utility model;
[0022] Fig.13 This is the test failure process and phenomenon of a steel-concrete light composite cover plate of the utility model;
[0023] Fig.14 This is a load-deflection characteristic value diagram of a steel-concrete lightweight composite cover plate of the utility model.
[0024] In the figure: 1. Side plate 1; 2. Side plate 2; 3. Edge bottom plate; 4. Edge plate; 5. Edge plate; 6. Middle main beam; 7. Partition plate; 8. Bottom plate; 9. Bottom plate; 10. Edge support; 11. Concrete; 12. Groove; 13. Bolt; 14. Bolt hole; 15. Rubber pad; 16. Lifting hole. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] The utility model provides a variable-section steel-concrete light composite cover plate assembled with bolts to strengthen edge support as shown in the figure, comprising two side plates 1 and two side plates 2, the two side plates 1 and the side plates 2 are welded and fixed to form a rectangle, an edge bottom plate 3 is fixedly connected to the bottom of the side plate 2, an edge plate 4 is fixedly connected to the edge bottom plate 3 and the edge plate 4 is arranged on the inner side of the side plate 2, one side of the edge plate 4 is fixedly connected to the side plate 2 and the other side is fixedly connected to the edge plate 2 5, both sides of the edge plate 2 5 are respectively fixedly connected to the inner sides of the two side plates 1 and a middle main beam 6 is fixedly connected between the two edge plates 2 5, a partition plate 7 is arranged on the middle main beam 6, a bottom plate 2 8 is fixedly arranged at the bottom of the side plates 1, the side plates 2 2 and the middle main beam 6, a bottom plate 9 is fixedly connected to the top of the middle main beam 6 between the two side plates 1, and an edge support 10 is arranged at the bottom of the bottom plate 2 8.
[0027] Specifically, the outer side of the partition plate 7 is fixedly connected to the side plate 1, and the bottom plate 9 is placed between the two bottom plates 8 to form a plane and concrete 11 is poured thereon.
[0028] Specifically, both ends of the upper bent portion of the side plate 1 are provided with lifting holes 16, and the upper bent portion of the side plate 1 is provided with a groove 12 at the location where the stress is minimal.
[0029] Specifically, it also includes bolts 13 , bolt holes 14 and rubber pads 15 . The inside of the groove 12 is connected by the bolts 13 . The bolts 13 pass through the preset bolt holes 14 . The upper part of the groove 12 is covered by the rubber pads 15 .
[0030] Working principle: Figure 1-Figure 11 As shown, firstly, two side plates 1 and two side plates 2 are symmetrically welded into a square steel frame; then, edge bottom plates are welded at the bottom of both ends of the steel frame, and edge plates 1 and 2 are welded on the upper part of the edge bottom plates, and the two ends of the middle main beam are correspondingly welded to the edge plates 2, and two partition plates are welded in the middle of the middle main beam, and bottom plates 1 and 2 are welded at 20mm from the top inside the steel frame, and edge supports are welded on the lower side of the side of the bottom plate 1 to form a steel grille; hoisting holes are provided at both ends of the upper bending part of the side plate 1, and a groove is provided at the upper bending part of the side plate 1 where the stress is the smallest, and the inside of the groove is connected by bolts, and the bolts pass through the preset bolt holes, and the upper part of the groove is covered with a rubber pad; concrete is poured on the upper part of the bottom plate 1 and the bottom plate 2;
[0031] Experiment: Fig.12 and Fig.13 As shown, a total of 2 composite cover plates were designed and manufactured for the test, namely B-1 and B-2, both of which are composite cover plates with variable cross-sections. All composite cover plates have the same panel size of 1140×350mm, and the frame steel is made of 3mm and 4mm steel plates. The thickness of the upper concrete is 20mm and 30mm, see Table 1 for details; the concrete is C50, the steel is Q345, and the steel bar is φ10-HRB400 grade. The side plate 1 of the composite cover plate with variable cross-section is bent inward up and down, and concrete is poured inside the support side plate, which improves the compressive performance of the composite cover plate support; the lower end of the middle main beam is bent, which greatly improves the tensile performance of the steel grille; ribbed steel bars are welded inside the steel grille to improve the integrity;
[0032] The failure process of cover plates B-1~B-2 is similar. Take plate B-1 as an example. At the beginning of loading, the specimen is in an elastic state, and the load increases linearly; when loaded to 200kN, transverse cracks appear at the edge of the pad and longitudinal cracks appear at the end of the plate; when loading continues to 447kN, the side plate and partition plate buckle, and the cracks continue to develop; when loaded to 460kN, the concrete cracks penetrate, the buckling deformation of the side plate and partition plate increases, the weld at the variable section at one end of the lower flange of the middle main beam is detached, and the variable section at both ends of the lower side plate is torn, and the specimen is destroyed. The failure phenomenon is as follows Fig.12 shown.
[0033] Force transmission path: The vertical load is borne by the upper concrete panel, and then transmitted to the middle main beam and edge support through the steel bottom plate and the partition plate. As the load increases, the cover plate enters the elastic-plastic stage, the upper concrete cracks under compression, and the upper part of the side plate buckles in the compression zone. As the load continues to increase, the concrete cracks penetrate, the side plate buckles and deforms severely, the flange of the main beam in the tension zone yields, and the specimen is destroyed. During the entire force-bearing and failure process, the upper concrete and the lower steel grille did not separate, and the deformation was basically the same, indicating that the two materials can work well together. Failure characteristics of the combined cover plate: The failure process is divided into three stages: the elastic stage, the specimen is in the elastic stage as a whole, and the lower steel grille bears most of the bending moment; as the load continues to be applied, cracks appear in the concrete at the end of the specimen and the edge of the loading pad, the side plate buckles, the deformation of the cover plate increases, and it enters the elastic-plastic stage. The longitudinal cracks of the concrete develop and produce transverse cracks; the variable section area and the mid-span side plate buckle under compression. Destruction stage: As the load continues to increase, the longitudinal and transverse cracks in the concrete penetrate, the panel is severely cracked and damaged, the side panels and partitions are severely buckled, the weld at the variable section at one end of the lower flange of the middle main beam is detached, the welds at the variable section at both ends of the side panels are torn, and the bearing capacity is degraded; finally, the outer side of the variable section yields and the cover is damaged;
[0034] Specific experimental data such as Fig.13 and Fig.14 As shown;
[0035] In summary, the structure of the utility model can be realized by adopting a steel-concrete composite structure. The upper part of the specimen is filled with high-strength concrete, and the lower part is a variable-section rolled steel grille. The concrete is arranged in the compression zone, and the steel structure is in the tension zone, which can give full play to the stress characteristics of the two materials. The manhole cover adopts a variable cross-section form. Compared with the traditional concrete cover, the deadweight of the new composite cover is reduced by 70%; the steel grille adopts a rolled design, one is for the convenience of molding, and the other is to increase the bending stiffness to achieve the purpose of improving the bearing capacity; edge supports are set on the edges to improve the edge bearing capacity to prevent the edge bearing capacity from being insufficient due to the fixed edge height when the manhole cover is replaced; a slot-shaped bolt connection method is proposed to solve the problems that traditional manhole covers are independent of each other, there are gaps on the edges, and the edge damage and sound pollution caused by the collision of the manhole covers when vehicles pass by; rubber pads are used to cover the connection parts to prevent the influence of rain and dust.
[0036] To sum up, while the structural rigidity and bearing capacity of the manhole cover of the present invention are improved, the economic cost is basically the same as that of the steel fiber concrete cover plate, the dead weight is reduced, the connection is convenient, the collision damage and sound pollution are reduced, and the performance is improved; the present invention adopts a steel-concrete composite structure, fully utilizing the advantages of the two materials to improve the structural rigidity and bearing capacity; adopts a variable cross-section to reduce the dead weight of the component; adds edge supports to strengthen the edge bearing capacity; adopts bolt connections to reduce collision damage and sound pollution; and covers the connection parts with rubber pads to prevent the influence of rain and dust.
[0037] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A bolt-assembled reinforced edge-supported variable-section steel-concrete light composite cover plate, comprising two side plates one (1) and two side plates two (2), wherein the two side plates one (1) and the side plates two (2) are welded and fixed to form a rectangle, and characterized in that: The bottom of the side plate 2 (2) is fixedly connected to an edge bottom plate (3), the edge bottom plate (3) is fixedly connected to an edge plate (4) and the edge plate (4) is arranged on the inner side of the side plate 2 (2), one side of the edge plate (4) is fixedly connected to the side plate 2 (2) and the other side is fixedly connected to the edge plate 2 (5), both sides of the edge plate 2 (5) are respectively fixedly connected to the inner sides of the two side plates 1 (1) and a middle main beam (6) is fixedly connected between the two edge plates 2 (5), a partition plate (7) is arranged on the middle main beam (6), a bottom plate 2 (8) is fixedly arranged at the bottom of the side plate 1 (1), the side plate 2 (2) and the middle main beam (6), a bottom plate (9) is fixedly connected to the top of the middle main beam (6) between the two side plates 1 (1), and an edge support (10) is arranged at the bottom of the bottom plate 2 (8).
2. The bolt-assembled reinforced edge-supported variable-section steel-concrete lightweight composite cover plate according to claim 1 is characterized in that: The outer side of the partition plate (7) is fixedly connected to the side plate 1 (1), and the bottom plate (9) is placed between the two bottom plates 2 (8) to form a plane and concrete (11) is poured thereon.
3. The bolt-assembled reinforced edge-supported variable-section steel-concrete lightweight composite cover plate according to claim 1 is characterized in that: Lifting holes (16) are provided at both ends of the upper bent portion of the side plate 1 (1), and a groove (12) is provided at the point where the stress is minimized in the upper bent portion of the side plate 1 (1).
4. The bolt-assembled reinforced edge-supported variable-section steel-concrete lightweight composite cover plate according to claim 3 is characterized in that: It also includes a bolt (13), a bolt hole (14) and a rubber pad (15); the interior of the groove (12) is connected using the bolt (13); the bolt (13) passes through the preset bolt hole (14); and the upper part of the groove (12) is covered with the rubber pad (15).