Oblique crossing self-stress butt strap structure
By designing the oblique self-stressed plate structure, the combination of high-expanded concrete and self-stressed longitudinal reinforcement is used to solve the problem of bridgehead jumping caused by the suspension of bridgehead plates, and the effect of high structural stiffness, high economy and simple construction is achieved.
Patent Information
- Application Number
- CN202422926636.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-11-29
AI Technical Summary
In the prior art, bridge head trays are easily suspended under the influence of uneven settlement between the bridge and the roadbed, resulting in excessive deformation of the board, which in turn causes the bridge head to jump off. The traditional solution is costly or complex in construction.
A oblique self-stressed plate structure is designed, using high-expanded concrete, self-stressed longitudinal bars, self-stressed transverse bars and tension plate components. The self-stressed longitudinal bars are stretched through the micro-expanded action of the high-expanded concrete to form longitudinal compressive stress, and resist the bending moment in the suspended part is too large.
Effectively avoiding damage to the board, improving the rigidity and economy of the structure, simplifying the construction technology, and avoiding the phenomenon of jumping from the bridgehead.
Smart Images
Figure CN223118841U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an obliquely - crossed self - stressing slab structure, and more specifically, especially relates to an obliquely - crossed self - stressing slab structure. Background Technique
[0002] How to avoid vehicle bumping at the bridge head of a highway has always been a difficult problem in highway construction. Traditional bridge - head slabs are generally designed as ordinary reinforced concrete structures. Under the influence of uneven settlement between the bridge and the bridge - head roadbed, the slab on the bridge - head side will be suspended. The suspended part of the slab will bear excessive bending moment, which will cause the slab to deform too much and be damaged, thus leading to vehicle bumping at the bridge head.
[0003] In order to avoid the occurrence of vehicle bumping at the bridge head, one traditional method is to increase the design thickness and steel reinforcement ratio of the slab. This method is costly and uneconomical. Another method is to adopt a fully prestressed concrete slab structure. This method requires tensioning equipment, resulting in complex construction technology. In actual projects, most of the roadbeds and bridges are obliquely crossed. Therefore, in order to achieve the stable setting of the slab on the bridge corbel, a slab suitable for obliquely crossing with the bridge needs to be designed. However, there is currently no slab design in an obliquely - crossed manner. For this reason, the utility model proposes an obliquely - crossed self - stressing slab structure. Summary of the Invention
[0004] The utility model aims to overcome the above - mentioned technical problems and provides an obliquely - crossed self - stressing slab structure.
[0005] The obliquely - crossed self - stressing slab structure of the utility model includes a self - stressing slab and a reinforced concrete slab. The self - stressing slab is arranged on the side close to the front wall, and the reinforced concrete slab is arranged on the side far from the front wall. The front end of the self - stressing slab is set on the corbel of the front wall, and the rear end of the self - stressing slab is connected to the front end of the reinforced concrete slab. Its characteristics are as follows: the self - stressing slab is composed of high - expansion concrete, self - stressing longitudinal bars, self - stressing transverse bars and a tensioning plate assembly. The tensioning plate assembly is arranged at the front end of the self - stressing slab. The rear end of the self - stressing longitudinal bars is fixed in the reinforced concrete slab, and the front end of the self - stressing longitudinal bars is welded to the tensioning plate assembly. The self - stressing longitudinal bars and self - stressing transverse bars are both cast in the high - expansion concrete. Both ends of the self - stressing slab are serrated end faces.
[0006] For the obliquely - crossed self - stressing slab structure of the utility model, the reinforced concrete slab is composed of ordinary concrete and longitudinal and transverse reinforced concrete bars cast therein. The length directions of the longitudinal and transverse reinforced concrete bars in the reinforced concrete slab are respectively consistent with the road driving direction and the road width direction.
[0007] The skew self-stressing bridging slab structure of the present utility model, wherein the tensioning plate assembly is composed of a front plate, a rear plate, a long middle plate and a short middle plate. The length of the front plate is equal to the diagonal width of the self-stressing bridging slab, and the width of the rear plate is equal to the width of the sawteeth of the serrated end face. The front plate is arranged adjacent to the front wall above the corbel, and the rear plate is fixed to the front plate through the long middle plate and the short middle plate; the cavity between the rear plate and the front plate is filled with slightly expanded concrete.
[0008] The skew self-stressing bridging slab structure of the present utility model, wherein rectangular stirrups are uniformly arranged in the self-stressing bridging slab, and the self-stressing longitudinal bars are tied and connected with the stirrups.
[0009] The skew self-stressing bridging slab structure of the present utility model, wherein the self-stressing longitudinal bars in the self-stressing bridging slab are arranged in two or three rows in the vertical direction, and the self-stressing transverse bars are arranged in two rows in the vertical direction. The self-stressing longitudinal bars are made of HRB400 steel bars with a diameter of 18mm to 25mm.
[0010] The skew self-stressing bridging slab structure of the present utility model, wherein the front plate, the rear plate, the long middle plate and the short middle plate are all made of steel plates with a thickness of 1.5 cm to 2.0 cm.
[0011] The skew self-stressing bridging slab structure of the present utility model, wherein the longitudinal bars and transverse bars of the reinforced concrete slab are both made of HRB335 steel bars with a diameter of 18mm to 25mm, and the longitudinal bars and transverse bars of the reinforced concrete slab are both arranged in two upper and lower rows.
[0012] The skew self-stressing bridging slab structure of the present utility model, wherein the grades of the high-expansion concrete, the ordinary concrete and the slightly expanded concrete are all 40MPa to 45MPa, and the self-stress value generated in the longitudinal direction by the high-expansion concrete after 90 days of pouring is 5MPa to 7MPa.
[0013] The beneficial effects of the present utility model are as follows: The skew self-stressing bridging slab structure of the present utility model is composed of a self-stressing bridging slab and a reinforced concrete slab. The self-stressing bridging slab is arranged close to the front wall, and the front end of the self-stressing bridging slab is arranged on the corbel. The reinforced concrete slab is arranged on the side far from the front wall, and the rear end of the self-stressing longitudinal bars in the self-stressing bridging slab is poured into the reinforced concrete slab, and the front end of the self-stressing longitudinal bars is welded to the tensioning plate assembly arranged at the front end. In this way, under the micro-expansion effect of the poured high-expansion concrete, a tensile effect will be exerted on the self-stressing longitudinal bars. The tensioned self-stressing longitudinal bars will cause the self-stressing bridging slab to generate longitudinal compressive stress. The compressed self-stressing bridging slab can better resist the slab failure caused by excessive bending moment of its suspended part. Compared with the existing slab structure, it has the advantages of simple process, high quality, large stiffness, economy and environmental protection. Brief Description of the Drawings
[0014] Figure 1 It is the front view of the skew self-stressing bridging slab structure of the present utility model;
[0015] Figure 2 It is the top view of the skew self-stressing slab structure of the present utility model;
[0016] Figure 3 It is the structural schematic diagram of the tensioning plate assembly in the present utility model.
[0017] In the figure: 1 is the self-stressing slab, 2 is the reinforced concrete slab, 3 is the tensioning plate assembly, 4 is the self-stressing longitudinal reinforcement, 5 is the self-stressing transverse reinforcement, 6 is the stirrup, 7 is the high-expansion concrete, 8 is the longitudinal reinforcement of the reinforced concrete slab, 9 is the transverse reinforcement of the reinforced concrete slab, 10 is the ordinary concrete, 11 is the front wall, 12 is the corbel, 13 is the front plate, 14 is the rear plate, 15 is the long middle plate, 16 is the short middle plate, 17 is the slightly-expansion concrete, 18 is the suspended part, 19 is the serrated end face. Specific embodiments
[0018] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0019] As Figure 1 and Figure 2 shown, the front view and the top view of the skew self-stressing slab structure of the present utility model are respectively given. The shown skew self-stressing slab structure is composed of a self-stressing slab 1 and a reinforced concrete slab 2. The self-stressing slab 1 is arranged on one side close to the front wall 11 of the bridge, and the reinforced concrete slab 2 is arranged on the side far from the front wall 11. The front end of the self-stressing slab 1 is placed on the corbel 12 of the front wall 11, and the rear end of the self-stressing slab 1 is connected to the front end of the reinforced concrete slab 2; except for the part where the self-stressing slab 1 is placed on the corbel 12, the other parts of the self-stressing slab 1 and the entire reinforced concrete slab 2 are laid on the road base.
[0020] The self-stressing slab 1 is composed of high-expansion concrete 7, self-stressing longitudinal reinforcement 4, self-stressing transverse reinforcement 5, stirrups 6 and a tensioning plate assembly 3. The tensioning plate assembly 3 is arranged at a position on the corbel 12 close to the front wall 11. The length direction of the self-stressing longitudinal reinforcement 4 is consistent with the road driving direction, and the self-stressing longitudinal reinforcement 4 is uniformly arranged in the road width direction. Correspondingly, the length direction of the self-stressing transverse reinforcement 5 is consistent with the road width direction, and it is uniformly arranged in the road driving direction. The stirrup 6 is rectangular and is uniformly arranged in the road driving direction. The stirrup 6 is tied to the self-stressing longitudinal reinforcement 4. The rear end of the self-stressing longitudinal reinforcement 4 is poured into the reinforced concrete slab 2, and the front end of the self-stressing longitudinal reinforcement 4 is welded to the tensioning plate assembly 3. Both end faces of the shown self-stressing slab 1 are serrated end faces 19.
[0021] The shown reinforced concrete slab 2 is composed of ordinary concrete 10 and longitudinal bars 8 and transverse bars 9 of the reinforced concrete slab cast therein. The longitudinal directions of the longitudinal bars 8 and transverse bars 9 of the reinforced concrete slab are respectively consistent with the road driving direction and the road width direction, and are evenly arranged at equal intervals in the road width and road driving directions. During construction, first, the ordinary concrete 10 of the reinforced concrete slab 2 is poured. After its strength reaches 60% of the designed strength, the high-expansion concrete 7 is poured. After the high-expansion concrete 7 is poured, it needs to be cured with water for 7 days.
[0022] It can be seen that since the rear end of the self-stress longitudinal bar 4 in the self-stress slab 1 is cast in the reinforced concrete slab 2 and the front end is welded to the tension plate assembly 3, the fixation of both ends of the self-stress longitudinal bar 4 is realized. When the high-expansion concrete 7 is poured, under the micro-expansion effect of the high-expansion concrete 7, the tension plate assembly 3 will move slightly outwards, thereby forming a slight tension on the self-stress longitudinal bar 4. The tensioned self-stress longitudinal bar 4 and the tension plate assembly 3 will generate a longitudinal compressive stress on the high-expansion concrete 7, and finally make the self-stress slab 1 have a compressive stress in the longitudinal direction. In this way, during the long-term service of the road, even if there is a suspended part 18 under the self-stress slab 1, the compressed self-stress slab 1 can still resist the failure of the slab caused by excessive bending moment of the suspended part, avoiding the occurrence of slab fracture phenomenon, and further avoiding the phenomenon of vehicle jumping at the bridgehead of the access road.
[0023] As Figure 3 shown, the structural schematic diagram of the tension plate assembly in the present utility model is given. The shown tension plate assembly 3 is composed of a front plate 13, a rear plate 14, a long middle plate 15 and a short middle plate 16. The length of the front plate 13 is equal to the diagonal width of the self-stress slab 1, and the length of the rear plate 14 is equal to the tooth pitch of the serrated end face 19. The front plate 13 is arranged on the corbel 12 and is close to the front wall 11. The rear plate 14 is arranged at the rear side of the front plate 13. The rear plate 14 is arranged at a certain angle with the front plate 13, and the size of the angle satisfies that the rear plate 14 is perpendicular to the self-stress longitudinal bar 4. The rear plate 14 is welded together through the long middle plate 15 and the short middle plate 16, and the front end of the self-stress longitudinal bar 4 is welded to the rear end face of the rear plate 14. Micro-expansion concrete 17 is poured between the rear plate and the front plate 13.
[0024] Among them, the self-stress longitudinal bars 4 are evenly arranged in two or three rows in the vertical direction of the self-stress slab 1. The self-stress longitudinal bars 4 can adopt HRB400 steel bars with a diameter of 18mm - 25mm. The self-stress slab transverse bars 5 are arranged in two upper and lower rows in the vertical direction of the self-stress slab 1. The longitudinal bars 8 and transverse bars 9 of the reinforced concrete slab in the reinforced concrete slab 2 can both adopt HRB335 steel bars with a diameter of 18mm - 25mm, and the longitudinal bars 8 and transverse bars 9 of the reinforced concrete slab are arranged in two upper and lower rows.
[0025] As shown, the self-stress value generated by the high-expansion concrete 7 in the longitudinal direction of the self-stress slab 1 after 90 days of pouring is 5 MPa to 7 MPa; the grade of the high-expansion concrete 7 is 40 MPa to 45 MPa. The grades of the ordinary concrete 10 and the slightly-expansion concrete 17 shown are also 40 MPa to 45 MPa. The front plate 13, the rear plate 14, the long middle plate 15, and the short middle plate 16 shown are all made of steel plates with a thickness of 1.5 cm to 2.0 cm.
Claims
1. An obliquely intersecting self-stressing bridging slab structure, comprising a self-stressing bridging slab (1) and a reinforced concrete slab (2). The self-stressing bridging slab is arranged on one side close to the front wall (11), and the reinforced concrete bridging slab is arranged on the side away from the front wall; the front end of the self-stressing bridging slab is arranged on the corbel (12) of the front wall, and the rear end of the self-stressing bridging slab is connected to the front end of the reinforced concrete slab; characterized in that: The self-stressing slab is composed of high-expansion concrete (7), self-stressing longitudinal bars (4), self-stressing transverse bars (5) and a tension plate assembly (3). The tension plate assembly is arranged at the front end of the self-stressing slab. The rear end of the self-stressing longitudinal bar is fixed in the reinforced concrete slab, and the front end of the self-stressing longitudinal bar is welded to the tension plate assembly. The self-stressing longitudinal bars and self-stressing transverse bars are both cast in the high-expansion concrete. Both ends of the self-stressing slab are serrated end faces (19).
2. The skew self-stressing slab structure according to claim 1, characterized in that: The reinforced concrete slab (2) is composed of ordinary concrete (10) and the longitudinal and transverse reinforced concrete slab bars (8 and 9) cast therein. The length directions of the longitudinal and transverse reinforced concrete slab bars are respectively consistent with the road driving direction and the road width direction.
3. The skew self-stressing slab structure according to claim 2, characterized in that: The tension plate assembly (3) is composed of a front plate (13), a rear plate (14), a long middle plate (15) and a short middle plate (16). The length of the front plate is equal to the diagonal width of the self-stressing slab, and the width of the rear plate is equal to the width of the serrations of the serrated end face. The front plate is arranged adjacent to the front wall (11) above the corbel (12), and the rear plate is fixed to the front plate through the long middle plate and the short middle plate. Micro-expansion concrete (17) is cast in the cavity between the rear plate and the front plate.
4. The skew self-stressing slab structure according to claim 3, characterized in that: Rectangular stirrups (6) are uniformly arranged in the self-stressing slab (1), and the self-stressing longitudinal bars (4) are tied to the stirrups.
5. The skew self-stressing slab structure according to claim 3 or 4, characterized in that: The self-stressing longitudinal bars (4) in the self-stressing slab (1) are arranged in two or three rows in the vertical direction, and the self-stressing transverse bars (5) are arranged in two rows in the vertical direction. The self-stressing longitudinal bars are made of HRB400 steel bars with a diameter of 18 mm to 25 mm.
6. The skew self-stressing slab structure according to claim 3 or 4, characterized in that: The front plate (13), the rear plate (14), the long middle plate (15) and the short middle plate (16) are all made of steel plates with a thickness of 1.5 cm to 2.0 cm.
7. The skew self-stressing slab structure according to claim 3 or 4, characterized in that: The longitudinal and transverse reinforced concrete slab bars (8 and 9) are both made of HRB335 steel bars with a diameter of 18 mm to 25 mm, and the longitudinal and transverse reinforced concrete slab bars are both arranged in two upper and lower rows.
8. The skew self-stressing slab structure according to claim 3 or 4, characterized in that: The grades of the high-expansion concrete (7), ordinary concrete (10) and micro-expansion concrete (17) are all 40 MPa to 45 MPa. The self-stress value generated by the high-expansion concrete in the longitudinal direction after 90 days of casting is 5 MPa to 7 MPa.