Pile plate soilless roadbed structure
By using prefabricated prefabricated concrete prefabricated plates in the pile plate soil-free roadbed, the connection between A plate, B plate, transverse self-stress joints and longitudinal self-stress joints is solved, and the problems of small span and low life of existing pile plate soil-free roadbed are achieved with a larger span and longer service life.
Patent Information
- Application Number
- CN202422977417.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-12-04
AI Technical Summary
The prefabricated plates of existing pile plate soilless roadbed structures have small spans, prone to cracks, and have low service life, which cannot meet the needs of environmental protection and efficient land use.
Prefabricated prestressed concrete prefabricated plates are adopted, including A plate, B plate, transverse self-stressed joints and longitudinal self-stressed joints. Plate A and B are connected through transverse self-stressed joints and longitudinal self-stressed joints to form prefabricated plates with a firm structure, and the pile foundation and cover beam provide support.
It improves the span and service life of the pile plate soilless roadbed, reduces the generation of cracks, and meets the requirements of environmental protection and efficient land use.
Smart Images
Figure CN223118775U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a soil-free subgrade structure, and more specifically, to a pile-plate soil-free subgrade structure composed of assembled prestressed concrete precast slabs. Background Art
[0002] With the rapid development of China's economy, the transportation road network has been increasingly developed and improved. However, people's requirements for the environment are also getting higher and higher. There is a contradiction between road construction and environmental protection. The existing high-fill subgrades of highways occupy a large amount of land and have a large volume of earthwork, which increasingly does not meet the requirements of the country for green, low-carbon, and environmental protection. Therefore, more and more pile-plate soil-free subgrades have emerged to save the occupation of land resources.
[0003] However, the precast slabs used in the existing pile-plate soil-free subgrades mostly adopt the reinforced concrete precast slab structure. Limited by the structure of the reinforced concrete precast slab itself, the pile-plate soil-free subgrade structure formed by it has a small span, the precast slabs are prone to cracks, and the service life is low. For this reason, the utility model proposes a pile-plate soil-free subgrade structure composed of pretensioned slabs to solve the problems of small span and low life of the existing pile-plate soil-free subgrades. Summary of the Invention
[0004] The utility model provides a pile-plate soil-free subgrade structure in order to overcome the above technical problems.
[0005] The pile-plate soil-free subgrade structure of the utility model includes pile foundations, capping beams, and assembled prestressed concrete precast slabs. The pile foundations are fixed in the original ground, the capping beams are fixed at the upper ends of the pile foundations, and the assembled prestressed concrete precast slabs are laid on the capping beams. Its characteristics are as follows: The assembled prestressed concrete precast slab is composed of A plates, B plates, transverse self-stress joints, and longitudinal self-stress joints. Both the A plates and the B plates are pretensioned precast slabs. The A plates are arranged on the capping beams, and the A plates on two adjacent capping beams are connected by B plates. The A plates and the B plates are connected by transverse self-stress joints. The number of A plates and B plates in the transverse direction of the road is 2 or more. Adjacent two A plates and adjacent two B plates are connected by longitudinal self-stress joints.
[0006] In the pile-plate soil-free subgrade structure of the utility model, 4 pile foundations inserted into the original ground are evenly arranged under each capping beam, and the pile foundations are reinforced concrete driven piles.
[0007] In the pile-plate soil-free subgrade structure of the utility model, the capping beam is a reinforced concrete structure.
[0008] The pile - plate soil - free subgrade structure of the present utility model, wherein the A - plate is composed of A - plate concrete and the upper - row steel strands, lower - row steel strands and transverse steel bars of the A - plate cast therein. The length directions of the upper - row steel strands and lower - row steel strands of the A - plate are both consistent with the road driving direction, and the transverse steel bars of the A - plate are consistent with the road width direction; the spacing of the upper - row steel strands of the A - plate is greater than the spacing of the lower - row steel strands of the A - plate.
[0009] The pile - plate soil - free subgrade structure of the present utility model, wherein the B - plate is composed of B - plate concrete and the upper - row steel strands, lower - row steel strands and transverse steel bars of the B - plate cast therein. The length directions of the upper - row steel strands and lower - row steel strands of the B - plate are both consistent with the road driving direction, and the length direction of the transverse steel bars of the B - plate is consistent with the road width direction; the spacing of the upper - row steel strands of the B - plate is less than the spacing of the lower - row steel strands of the B - plate.
[0010] The pile - plate soil - free subgrade structure of the present utility model, wherein the transverse self - stress joint is composed of transverse self - stress joint high - expansion concrete and the longitudinal bars and transverse bars of the transverse self - stress joint cast therein. The length directions of the longitudinal bars and transverse bars of the transverse self - stress joint are respectively consistent with the road driving direction and the road width direction, and the two ends of the longitudinal bars of the transverse self - stress joint are respectively embedded in the end faces of the A - plate and the B - plate.
[0011] The pile - plate soil - free subgrade structure of the present utility model, wherein the longitudinal self - stress joint is composed of longitudinal self - stress joint high - expansion concrete and the transverse bars and longitudinal bars of the longitudinal self - stress joint cast therein. The length directions of the transverse bars and longitudinal bars of the longitudinal self - stress joint are respectively consistent with the road width direction and the road driving direction, and the two ends of the transverse bars of the longitudinal self - stress joint are embedded in the side faces of two adjacent A - plates or two adjacent B - plates.
[0012] The pile - plate soil - free subgrade structure of the present utility model, wherein the grades of the A - plate concrete, B - plate concrete, transverse self - stress joint high - expansion concrete and longitudinal self - stress joint high - expansion concrete are all 40MPa - 50MPa. The self - stress value generated by the transverse self - stress joint high - expansion concrete in the road driving direction after pouring is 3MPa - 5MPa, and the self - stress value generated by the longitudinal self - stress joint high - expansion concrete in the road width direction after pouring is 3MPa - 5MPa.
[0013] The beneficial effects of the present utility model are as follows: The pile - slab soil - free subgrade structure of the present utility model is provided with pile foundations, capping beams and precast prestressed concrete slabs. The precast prestressed concrete slabs are composed of A - slabs, B - slabs, transverse self - stress joints and longitudinal self - stress joints. Both the A - slabs and B - slabs are precast slabs by the pretensioning method. The A - slabs are fixed on the capping beams, and adjacent two A - slabs are connected by B - slabs. The A - slabs and B - slabs are connected by transverse self - stress joints, and adjacent two A - slabs and adjacent two B - slabs in the road width direction are connected by longitudinal self - stress joints. In this way, the A - slabs and B - slabs connected by transverse self - stress joints and longitudinal self - stress joints form a precast prestressed concrete slab with a firm structure. Compared with the existing ordinary reinforced concrete precast slabs, it has the advantages of large span, not easy to generate cracks and long service life.
[0014] Furthermore, transverse self - stress joint longitudinal bars and transverse bars are arranged in the transverse self - stress joints, and longitudinal self - stress joint transverse bars and longitudinal bars are arranged in the longitudinal self - stress joints. The two ends of the transverse self - stress joint longitudinal bars are embedded in the A - slabs and B - slabs, and the two ends of the longitudinal self - stress joint transverse bars are embedded in adjacent two A - slabs or adjacent two B - slabs, making the connection between the A - slabs and B - slabs and between adjacent A - slabs and adjacent B - slabs very firm, ensuring that the service life of the formed pile - slab soil - free subgrade structure meets the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is the front view of the pile - slab soil - free subgrade structure of the present utility model;
[0016] Figure 2 is the top view of the pile - slab soil - free subgrade structure of the present utility model;
[0017] Figure 3 is Figure 2 the cross - sectional view of the A - A section in
[0018] Figure 4 is Figure 2 the cross - sectional view of the B - B section in
[0019] In the figure: 1 A - slab, 2 B - slab, 3 transverse self - stress joint, 4 longitudinal self - stress joint, 5 capping beam, 6 pile foundation, 7 upper row of steel strands of A - slab, 8 lower row of steel strands of A - slab, 9 transverse reinforcement of A - slab, 10 concrete of A - slab, 11 upper row of steel strands of B - slab, 12 lower row of steel strands of B - slab, 13 transverse reinforcement of B - slab, 14 concrete of B - slab, 15 transverse self - stress joint longitudinal bar, 16 transverse self - stress joint transverse bar, 17 high - expansion concrete of transverse self - stress joint, 18 longitudinal self - stress joint transverse bar, 19 longitudinal self - stress joint longitudinal bar, 20 high - expansion concrete of longitudinal self - stress joint. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0021] As Figure 1 and Figure 2 shown, the front view and top view of the pile - slab soil - free subgrade structure of the present utility model are respectively given. Figure 3 and Figure 4 respectively give Figure 2 the sectional views of the A - A section and B - B section in
[0022] The shown pile - slab soil - free subgrade structure is composed of pile foundations 6, capping beams 5 and precast prestressed concrete slabs. The pile foundations 6 are inserted into the original ground to support the capping beams 5. The capping beams 5 are fixed at the upper ends of the pile foundations 6, and the precast prestressed concrete slabs are laid on the capping beams 5. The precast prestressed concrete slabs are composed of A - plates 1, B - plates 2, transverse self - stress joints 3 and longitudinal self - stress joints 4. Both the A - plates 1 and B - plates 2 are precast slabs by the pretensioning method.
[0023] As shown, the A - plate 1 is fixed on the capping beam 5. In the transverse direction of the road, the number of A - plates 1 and B - plates 2 is both 2 or more. In the driving direction of the road, two adjacent A - plates 1 are connected by B - plates 2. The A - plates 1 and B - plates are connected by transverse self - stress joints 3. In the width direction of the road, two adjacent A - plates 1 or two adjacent B - plates 2 are connected by longitudinal self - stress joints 4.
[0024] The shown A - plate 1 is composed of A - plate concrete 10, upper - row A - plate steel strands 7, lower - row A - plate steel strands 8 and A - plate transverse steel bars 9 cast in the A - plate concrete 10. The length directions of the upper - row A - plate steel strands 7 and the lower - row A - plate steel strands 8 are both along the driving direction of the road, and the length direction of the A - plate transverse steel bars 9 is along the width direction of the road. When the A - plate 1 is precast, after the upper - row A - plate steel strands 7 and the lower - row A - plate steel strands 8 are relaxed, longitudinal prestress will be generated in the A - plate 1. The longitudinal prestress on the A - plate 1 can offset the tensile stress generated during vehicle driving, so as to improve the bearing capacity of the A - plate 1 for vehicle loads.
[0025] Since the middle part of the A - plate 1 is supported on the capping beam 5, the vehicle load traveling between the two capping beams 5 causes the A - plate 1 to be in a state of tension in the upper part and compression in the lower part. Therefore, the spacing of the upper - row steel strands 7 of the A - plate is greater than the spacing of the lower - row steel strands 8 of the A - plate, that is, the upper - row steel strands 7 of the A - plate are denser to increase the bearing capacity of the A - plate. The B - plate located between the two A - plates 1 is in a state of compression in the upper part and compression in the lower part. Therefore, the spacing of the upper - row steel strands 11 of the B - plate is less than the spacing of the lower - row steel strands 12 of the B - plate, that is, the lower - row steel strands 12 of the B - plate are denser to increase the bearing capacity of the B - plate.
[0026] The shown transverse self - stress joint 3 is composed of transverse self - stress joint high - expansion concrete 17 and transverse self - stress joint longitudinal reinforcement 15 and transverse self - stress joint transverse reinforcement 16 cast therein. The transverse self - stress joint longitudinal reinforcement 15 is along the road driving direction, and the transverse self - stress joint transverse reinforcement 16 is along the road width direction. The two ends of the transverse self - stress joint longitudinal reinforcement 15 are embedded in the end faces of the A - plate 1 and the B - plate 2. It is formed by welding two sections of steel bars. The two sections of steel bars are embedded in the A - plate 1 and the B - plate 2, and after the A - plate 1 and the B - plate 2 are laid in place, the two - end steel bars are welded to form the transverse self - stress joint longitudinal reinforcement 15.
[0027] The shown longitudinal self - stress joint 4 is composed of longitudinal self - stress joint high - expansion concrete 20 and longitudinal self - stress joint transverse reinforcement 18 and longitudinal self - stress joint longitudinal reinforcement 19 cast therein. The longitudinal self - stress joint transverse reinforcement 18 is along the road width direction, and the longitudinal self - stress joint longitudinal reinforcement 19 is along the road driving direction. The two ends of the longitudinal self - stress joint transverse reinforcement 18 are embedded in the side faces of two adjacent A - plates 1 or two adjacent B - plates 2. The longitudinal self - stress joint transverse reinforcement 18 is formed by welding two sections of steel bars. The two sections of steel bars are respectively embedded in the A - plate 1 or the B - plate 2. After the A - plate 1 and the B - plate 2 are installed in place, the two sections of steel bars are welded to form the longitudinal self - stress joint transverse reinforcement 18.
[0028] It can be seen that after the A - plate 1 and the B - plate 2 are connected by the transverse self - stress joint 3 and the longitudinal self - stress joint 4, a stable integral form of precast prestressed concrete slabs can be formed. After the precast prestressed concrete slabs are fixed on the capping beam 5 supported by the pile foundation 6, compared with the existing ordinary reinforced concrete precast slabs, they have the advantages of large span, not easy to generate cracks, and high service life.
[0029] Among them, the grades of the A - plate concrete 10, the B - plate concrete 14, the transverse self - stress joint high - expansion concrete 17, and the longitudinal self - stress joint high - expansion concrete 20 are all 40MPa - 50MPa. The self - stress value generated by the transverse self - stress joint high - expansion concrete 17 in the road driving direction after pouring is 3MPa - 5MPa, and the self - stress value generated by the longitudinal self - stress joint high - expansion concrete 20 in the road width direction after pouring is 3MPa - 5MPa. During construction, first pour the transverse self - stress joint 3, and then pour the longitudinal self - stress joint 4. After pouring the transverse self - stress joint 3 and the longitudinal self - stress joint 4, it is necessary to sprinkle water for curing for 7 days.
Claims
1. A pile-plate soil-free subgrade structure, comprising a pile foundation (6), a capping beam (5) and precast prestressed concrete slabs. The pile foundation is fixed in the original ground, the capping beam is fixed at the upper end of the pile foundation, and the precast prestressed concrete slabs are laid on the capping beam; characterized in that: The precast prestressed concrete slab is composed of slab A (1), slab B (2), transverse self-stress joints (3) and longitudinal self-stress joints (4). Both slab A and slab B are precast slabs by the pretensioning method. Slab A is arranged on the capping beam. The slab As on two adjacent capping beams are connected by slab B. Slab A and slab B are connected by transverse self-stress joints; in the transverse direction of the road, the number of slab A and slab B is 2 or more, and two adjacent slab As and two adjacent slab Bs are connected by longitudinal self-stress joints.
2. The pile-plate soil-free subgrade structure according to claim 1, characterized in that: Four pile foundations (6) inserted into the original ground are evenly arranged under each capping beam (5). The pile foundations are reinforced concrete driven piles.
3. The pile-plate soil-free subgrade structure according to claim 1 or 2, characterized in that: The capping beam (5) is of reinforced concrete structure.
4. The pile-plate soil-free subgrade structure according to claim 1 or 2, characterized in that: The slab A (1) is composed of slab A concrete (10) and the upper row of steel strands of slab A (7), the lower row of steel strands of slab A (8) and the transverse steel bars of slab A (9) cast therein. The length directions of the upper row of steel strands of slab A and the lower row of steel strands of slab A are both consistent with the road driving direction, and the transverse steel bars of slab A are consistent with the road width direction; the spacing of the upper row of steel strands of slab A is greater than the spacing of the lower row of steel strands of slab A.
5. The pile-plank soil-free subgrade structure according to claim 4, characterized in that: The slab B (2) is composed of slab B concrete (14) and the upper row of steel strands of slab B (11), the lower row of steel strands of slab B (12) and the transverse bars of slab B (13) cast therein. The length directions of the upper row of steel strands of slab B and the lower row of steel strands of slab B are both consistent with the road driving direction, and the length direction of the transverse bars of slab B is consistent with the road width direction; the spacing of the upper row of steel strands of slab B is less than the spacing of the lower row of steel strands of slab B.
6. The pile-plank soil-free subgrade structure according to claim 5, characterized in that: The transverse self-stress joint (3) is composed of high-expansion concrete for transverse self-stress joints (17) and the longitudinal bars for transverse self-stress joints (15) and the transverse bars for transverse self-stress joints (16) cast therein. The length directions of the longitudinal bars for transverse self-stress joints and the transverse bars for transverse self-stress joints are respectively consistent with the road driving direction and the road width direction. The two ends of the longitudinal bars for transverse self-stress joints are respectively embedded in the end faces of slab A and slab B.
7. The pile-plate soil-free subgrade structure according to claim 6, characterized in that: The longitudinal self-stress joint (4) is composed of high-expansion concrete for longitudinal self-stress joints (20) and the transverse bars for longitudinal self-stress joints (18) and the longitudinal bars for longitudinal self-stress joints (19) cast therein. The length directions of the transverse bars for longitudinal self-stress joints and the longitudinal bars for longitudinal self-stress joints are respectively consistent with the road width direction and the road driving direction. The two ends of the transverse bars for longitudinal self-stress joints are embedded in the side faces of two adjacent slab As (1) or two adjacent slab Bs (2).
8. The pile-plank soil-free subgrade structure according to claim 7, characterized in that: The grades of the slab A concrete (10), slab B concrete (14), high-expansion concrete for transverse self-stress joints (17) and high-expansion concrete for longitudinal self-stress joints (20) are all 40MPa - 50MPa. The self-stress value generated by the high-expansion concrete for transverse self-stress joints in the road driving direction after pouring is 3MPa - 5MPa, and the self-stress value generated by the high-expansion concrete for longitudinal self-stress joints in the road width direction after pouring is 3MPa - 5MPa.