Oblique crossing self-stress cement concrete prefabricated slab structure
By adopting oblique self-stressed cement concrete prefabricated slab structure in reinforced concrete prefabricated slabs, the design of high-expanded concrete and self-stressed ribs combined with special-shaped tensioning plates is solved, and the problems of prone to cracking, high production costs and cumbersome processes of the existing prefabricated slabs are achieved, and the uniform pressure self-stress distribution of the prefabricated slabs are achieved and the stable stress of the self-stressed ribs is improved, which is the firmness and service life of the plates are improved.
Patent Information
- Application Number
- CN202422136542.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The existing reinforced concrete prefabricated plates, first-rolled prefabricated plates and later-rolled prefabricated plates have problems such as easy cracking, high production costs and cumbersome processes during production and use, and are particularly prominent in the application of oblique pavement panels.
The oblique self-stressed cement concrete prefabricated plate structure is adopted. The structure is composed of high-expanded concrete, longitudinal self-stressed ribs, transverse crack-proof self-stressed ribs and special-shaped tensioning plates. The special-shaped tensioning plate is uniformly distributed in the longitudinal and transverse directions of the prefabricated plates and is welded vertically with the self-stressed ribs to form a uniformly distributed pressure self-stress.
Through uniformly distributed pressure self-stressing, the problem that longitudinal and transverse self-stressing ribs in the existing oblique self-stressing prefabricated plates cannot be parallel to the side and perpendicular to the end tensioning plates is solved, which improves the internal pressure self-stressing uniformity of the prefabricated plates and the stability of the self-stressing direction of the self-stressing ribs. The self-stressing prefabricated plate structure formed is stronger and has a longer life.
Smart Images
Figure CN222759210U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a concrete prefabricated board structure, in particular to an oblique self-stressed cement concrete prefabricated board structure. Background Art
[0002] Reinforced concrete precast panels are prone to cracking, which affects their service life. In order to extend the service life of reinforced concrete precast panels, pre-tensioned precast panels made of reinforced concrete have been developed. Pre-tensioned precast panels are to tension the steel strands during the production process of the precast panels. The steel strands in tension are anchored with anchor plates and anchors. The steel strands in tension generate pressure on the precast panels through the anchor plates. The precast panels in compression have stronger bearing capacity and longer service life.
[0003] Since pre-tensioned precast panels require a tensioning pedestal, if they are not mass-produced, the cost is high. Therefore, in order to solve the problem of high production costs of pre-tensioned precast panels, post-tensioned precast panels have emerged. Post-tensioned precast panels are prefabricated at the construction site of roads or bridges. During the prefabrication process, the steel strands are tensioned by tensioning tools. After the tensioning is completed, grouting needs to be injected into the inner cavity of the steel pipe outside the steel strands. The process is complicated, the construction period is long, and the cost is relatively high.
[0004] In actual engineering applications, orthogonal road panels are rarely used, and oblique road panels are often used, such as bridge slabs or road panels at curves. Therefore, in order to solve the problems of easy cracking, high production cost, and complicated process of existing reinforced concrete precast panels, pre-tensioned precast panels, and post-tensioned precast panels, this paper proposes an oblique self-stressed cement concrete precast panel structure. Summary of the invention
[0005] In order to overcome the disadvantages of the above technical problems, the utility model provides an oblique self-stressed cement concrete prefabricated board structure.
[0006] The utility model discloses an oblique self-stressed cement concrete prefabricated panel structure, wherein the prefabricated panel is composed of high-expansion concrete and longitudinal self-stressed ribs and transverse anti-cracking self-stressed ribs cast in the high-expansion concrete, and the prefabricated panel is a non-rectangular parallelogram; special-shaped tensioning panels are evenly arranged in the two end surfaces in the longitudinal direction of the prefabricated panel, and special-shaped tensioning panels are arranged at positions close to the end surfaces in the two side surfaces in the transverse direction of the prefabricated panel; the characteristic is that: the outer side of the special-shaped tensioning panel is provided with an outer side panel flush with the end surface or the side surface of the prefabricated panel, the inner side of the special-shaped tensioning panel is provided with an inner side panel, the inner side panel on the special-shaped tensioning panel in the end surface is perpendicular to the side surface of the prefabricated panel, and the inner side panel on the special-shaped tensioning panel in the side surface is perpendicular to the end surface of the prefabricated panel; the two ends of the longitudinal self-stressed ribs are vertically welded to the inner side panels of the special-shaped tensioning panels aligned in the two end surfaces, and the two ends of the transverse anti-cracking self-stressed ribs are vertically welded to the inner side panels of the special-shaped tensioning panels aligned in the two side surfaces.
[0007] The utility model discloses an oblique self-stressed cement concrete prefabricated plate structure, wherein the longitudinal self-stressed tendons and the transverse anti-cracking self-stressed tendons welded on two aligned special-shaped tensioning plates are each a group of 4 to 9 secondary steel bars, and the group of 4 to 9 secondary steel bars are evenly distributed along a rectangle; the longitudinal self-stressed tendons and the transverse anti-cracking self-stressed tendons formed by the group of 4 to 9 secondary steel bars are evenly tied with first stirrups and second stirrups respectively.
[0008] The utility model discloses an oblique self-stressed cement concrete prefabricated board structure, wherein the prefabricated board has a board length of 3.0m-10.0m, a board width of 3.0m-5.0m, a board thickness of 20cm-40cm, and an acute angle of the prefabricated board of not less than 45°.
[0009] The utility model discloses an oblique self-stressed cement concrete prefabricated panel structure, wherein the special-shaped tensioned panel is composed of an outer side panel, an inner side panel, an upper panel, a lower panel, a long vertical panel and a short vertical panel which are welded to each other into a hexahedron, the interior of the special-shaped tensioned panel is a sealed cavity which is not communicated with the outside, a neutral plate is arranged in the sealed cavity, and the height of the special-shaped tensioned panel is equal to the height of the prefabricated panel.
[0010] The utility model discloses an oblique self-stressed cement concrete prefabricated panel structure, wherein the upper panel and the lower panel are equal right-angled trapezoids, the upper panel is parallel to and aligned with the lower panel, the outer edge panel, the inner edge panel, the long vertical panel, the short vertical panel and the middle panel are vertically welded to the upper panel and the lower panel, and the long vertical panel, the short vertical panel and the middle panel are vertically welded to the outer edge panel; the acute angles and the obtuse angles on the upper panel and the lower panel are respectively equal to the acute angles and the obtuse angles of the prefabricated panel.
[0011] The utility model discloses an oblique self-stressed cement concrete prefabricated board structure, wherein the high expansion concrete is labeled 40MPa-45MPa, and after the prefabricated board is prefabricated, the self-stress value of the high expansion concrete along the longitudinal self-stressing tendon direction is 3.0MPa-5.0MPa.
[0012] The beneficial effects of the utility model are as follows: the oblique self-stressed cement concrete prefabricated panel structure of the utility model is composed of high-expansion concrete and longitudinal self-stressed ribs, transverse anti-cracking self-stressed ribs and special-shaped tensioning panels cast therein; the special-shaped tensioning panels are arranged in the two end faces in the longitudinal direction of the prefabricated panel and in the two side faces in the transverse direction close to the end faces; the outer side panels of the special-shaped tensioning panels are flush with the end faces or side faces of the prefabricated panel; the inner side panels of the special-shaped tensioning panels in the end faces are perpendicular to the side faces; the inner side panels of the special-shaped tensioning panels in the side faces are perpendicular to the end faces; the longitudinal self-stressed ribs and transverse anti-cracking self-stressed ribs are respectively vertically welded to the inner sides of the special-shaped tensioning panels in the end faces and the side faces. On the side plate; in this way, the longitudinal self-stressing tendons and the transverse anti-cracking self-stressing tendons are not only parallel to the side and end faces (i.e., the two sides of the precast panel) respectively, but also perpendicular to the special-shaped tensioning plates at both ends. Therefore, in the process of expansion of the high-expansion concrete, uniformly distributed compressive self-stress will be generated through the longitudinal self-stressing tendons, the transverse anti-cracking self-stressing tendons and the special-shaped tensioning plates, which solves the problem that the longitudinal and transverse self-stressing tendons in the existing oblique self-stressing precast panels cannot be parallel to the sides and perpendicular to the tensioning plates at the ends at the same time, so that the compressive self-stress inside the precast panel is uniform and the force direction of the self-stressing tendons is stable, so that the self-stressing precast panel formed has a firm structure and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a top view of the oblique self-stressed cement concrete prefabricated panel structure of the utility model;
[0014] Figure 2 This is a front view of the special-shaped tension plate in the utility model;
[0015] Figure 3 It is a bottom view of the special-shaped tension plate in the utility model;
[0016] Figure 4 for Figure 3 Cross-sectional view of section AA.
[0017] In the figure: 1 longitudinal self-stressing reinforcement, 2 transverse anti-cracking self-stressing reinforcement, 3 high expansion concrete, 4 first stirrup, 5 second stirrup, 6 special-shaped tensioning plate, 7 outer plate, 8 inner plate, 9 upper panel, 10 lower panel, 11 long vertical plate, 12 short vertical plate, 13 middle plate, 14 sealed cavity, 15 precast plate, 16 end surface, 17 side surface. DETAILED DESCRIPTION
[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0019] like Figure 1As shown, a top view of the oblique self-stressed cement concrete prefabricated panel structure of the utility model is given. The prefabricated panel 15 shown is composed of high expansion concrete 3 and longitudinal self-stressed tendons 1, transverse anti-cracking self-stressed tendons 2 and special-shaped tensioning plates 6 cast therein. The prefabricated panel 15 has two end faces 16 in the longitudinal direction (i.e., the driving direction) and two side faces 17 in the transverse direction (i.e., the road width direction). The prefabricated panel 15 is a non-rectangular parallelogram, that is, an oblique form. Special-shaped tensioning plates 6 cast in high expansion concrete 3 are evenly arranged in the two end faces 16 of the prefabricated panel 15, and special-shaped tensioning plates 6 cast in high expansion concrete 3 are arranged near the end faces 16 in the two side faces 17 of the prefabricated panel 15. The special-shaped tensioning plates 6 aligned in the two end faces are connected by the longitudinal self-stressed tendons 1, and the special-shaped tensioning plates 6 aligned in the side faces 17 are connected by the transverse anti-cracking self-stressed tendons 2.
[0020] like Figure 2 and Figure 3 As shown, the front view and bottom view of the special-shaped tension plate in the utility model are respectively given, Figure 4 Given Figure 3 In the sectional view of section AA, the outer plate 7 and the inner plate 8 are arranged on the special-shaped tensioning plate 6, the outer plate 7 on the special-shaped tensioning plate 6 in the end face 16 is flush with the end face 16, and the inner plate 8 is perpendicular to the side 17 of the prefabricated plate 15 (i.e., the side edge of the prefabricated plate 15), and the outer plate 7 on the special-shaped tensioning plate 6 in the side face 17 is flush with the side face 17, and the inner plate 8 is perpendicular to the end face of the prefabricated plate 15 (i.e., the end edge of the prefabricated plate 15).
[0021] In this way, when the two ends of the longitudinal self-stressing tendon 1 are vertically welded to the inner side plates 8 on the two special-shaped tensioning plates 6 aligned in the two end faces 16, not only the verticality of the longitudinal self-stressing tendon 1 and the special-shaped tensioning plates 6 is achieved, but also the parallelism of the longitudinal self-stressing tendon 1 and the side 17 of the prefabricated plate 15 is ensured. When the two ends of the transverse anti-cracking self-stressing tendon 2 are welded to the inner side plates 8 on the two special-shaped tensioning plates 6 aligned in the two side faces 17, not only the verticality of the transverse anti-cracking self-stressing tendon 2 and the special-shaped tensioning plates 6 connected thereto is achieved, but also the parallelism of the transverse anti-cracking self-stressing tendon 2 and the end face 16 of the prefabricated plate 15 is achieved. The problem that the longitudinal and transverse self-stressing tendons in the existing oblique self-stressing prefabricated plates cannot be parallel to the side and perpendicular to the tensioning plates at the same time is solved.
[0022] It is precisely because the longitudinal self-stressing tendons 1 and the transverse anti-cracking self-stressing tendons 2 in the utility model are parallel to the side surface 17 and the end surface 16 of the precast panel 15, respectively, and perpendicular to the special-shaped tensioning plates 6 at both ends thereof, after pouring the high-expansion concrete 3, under the outward expansion of the high-expansion concrete 3, the special-shaped tensioning plates 6 slightly move outward and apply tension to the longitudinal self-stressing tendons 1 and the transverse anti-cracking self-stressing tendons 2, and the precast panel 15 has a compressive self-stress under the reverse force of the special-shaped tensioning plates 6 and the longitudinal self-stressing tendons 1. The compressive self-stress in the precast panel 15 can offset the tensile stress generated during driving to ensure that the service life of the precast panel 15 meets the design requirements.
[0023] The special-shaped tensioning plate 6 shown is also provided with an upper panel 9, a lower panel 10, a long vertical plate 11, a short vertical plate 12 and a neutral plate 13. The outer side plate 7, the inner side plate 8, the upper panel 9, the lower panel 10, the long vertical plate 11 and the end vertical plate 12 are welded in sequence to form a hexahedral special-shaped tensioning plate 6. The interior of the hexahedral special-shaped tensioning plate 6 is a sealed cavity 14 that is not communicated with the outside. The sealed cavity 14 is provided with a neutral plate 13 that is welded with the upper panel 9, the lower panel 10, the outer side plate 7 and the inner side plate 8. The neutral plate 13 can effectively increase the stability of the special-shaped tensioning plate 6. The height of the special-shaped tensioning plate 6 is equal to the height of the prefabricated plate 15.
[0024] The upper panel 9 and the lower panel 10 are equal right-angled trapezoids, the upper panel 9 is parallel to the lower panel 10 and is aligned, the outer panel 7, the inner panel 8, the long vertical panel 11, the short vertical panel 12 and the middle panel 13 are vertically welded to the upper panel 9 and the lower panel 10, and the long vertical panel 11, the short vertical panel 12 and the middle panel 13 are perpendicular to the outer panel 7. The acute angle and the obtuse angle of the upper panel 9 and the lower panel 10 in the right-angled trapezoid shape are respectively equal to the acute angle and the obtuse angle of the prefabricated panel 15.
[0025] Among them, the longitudinal self-stressing tendons 1 and the transverse anti-cracking self-stressing tendons 2 welded on the two aligned special-shaped tensioning plates 6 are both a group of 4 to 9 secondary steel bars, and a group of 4 to 9 secondary steel bars are evenly distributed along the rectangle. The longitudinal self-stressing tendons 1 and the transverse anti-cracking self-stressing tendons 2 composed of a group of 4 to 9 secondary steel bars are evenly tied with first stirrups 4 and second stirrups 5 respectively.
[0026] As specific size requirements, the precast panel 15 shown has a length of 3.0m~10.0m, a width of 3.0m~5.0m, a thickness of 20cm~40cm, and an acute angle of not less than 45°. The grade of the high expansion concrete 3 is 40MPa~45MPa. After the precast panel 15 is precast, the self-stress value of the high expansion concrete along the longitudinal self-stressing tendon 1 is 3.0MPa~5.0MPa. After the high expansion concrete 3 is poured, it is covered with curing water for not less than 7 days.
Claims
1. An oblique self-stressed cement concrete precast panel structure, the precast panel (15) is composed of high expansion concrete (3) and longitudinal self-stressed tendons (1) and transverse anti-cracking self-stressed tendons (2) cast in the high expansion concrete, the precast panel is a non-rectangular parallelogram; special-shaped tensioning plates (6) are evenly arranged in both end faces (16) in the longitudinal direction of the precast panel, and special-shaped tensioning plates are arranged in both side faces (17) in the transverse direction of the precast panel at positions close to the end faces; the characteristics are: The outer side of the special-shaped tensioning plate (6) is provided with an outer side plate (7) flush with the end face or side face of the prefabricated plate, and the inner side plate (8) is provided on the inner side of the special-shaped tensioning plate. The inner side plate on the special-shaped tensioning plate in the end face is perpendicular to the side face of the prefabricated plate, and the inner side plate on the special-shaped tensioning plate in the side face is perpendicular to the end face of the prefabricated plate; the two ends of the longitudinal self-stressing tendons are vertically welded to the inner side plates of the special-shaped tensioning plates aligned in the two end faces, and the two ends of the transverse anti-cracking self-stressing tendons are vertically welded to the inner side plates of the special-shaped tensioning plates aligned in the two side faces.
2. The oblique self-stressed cement concrete prefabricated panel structure according to claim 1 is characterized in that: The longitudinal self-stressing bars (1) and the transverse anti-cracking self-stressing bars (2) welded on the two aligned special-shaped tensioning plates (6) are each a group of 4 to 9 secondary steel bars, and the group of 4 to 9 secondary steel bars are evenly distributed along the rectangle; the longitudinal self-stressing bars and the transverse anti-cracking self-stressing bars formed by the group of 4 to 9 secondary steel bars are evenly tied with first stirrups (4) and second stirrups (5), respectively.
3. The oblique self-stressed cement concrete prefabricated panel structure according to claim 1 or 2, characterized in that: The prefabricated plate (15) has a length of 3.0 m to 10.0 m, a width of 3.0 m to 5.0 m, a thickness of 20 cm to 40 cm, and an acute angle of not less than 45°.
4. The oblique self-stressed cement concrete prefabricated panel structure according to claim 1 or 2, characterized in that: The special-shaped tensioning plate (6) is composed of an outer plate (7), an inner plate (8), an upper panel (9), a lower panel (10), a long vertical plate (11) and a short vertical plate (12) which are welded to each other to form a hexahedron. The interior of the special-shaped tensioning plate is a sealed cavity (14) which is not communicated with the outside. A neutral plate (13) is arranged in the sealed cavity. The height of the special-shaped tensioning plate is equal to the height of the prefabricated plate (15).
5. The oblique self-stressed cement concrete prefabricated panel structure according to claim 4 is characterized in that: The upper panel (9) and the lower panel (10) are equal right-angled trapezoids. The upper panel is parallel to and aligned with the lower panel. The outer panel (7), the inner panel (8), the long vertical panel (11), the short vertical panel (12) and the middle panel (13) are vertically welded to the upper panel and the lower panel. The long vertical panel, the short vertical panel and the middle panel are vertically welded to the outer panel. The acute angles and obtuse angles on the upper panel and the lower panel are respectively equal to the acute angles and obtuse angles of the prefabricated panel (15).
6. The oblique self-stressed cement concrete prefabricated panel structure according to claim 1 or 2, characterized in that: The grade of the high expansion concrete (3) is 40 MPa to 45 MPa. After the prefabricated panel (15) is prefabricated, the self-stress value of the high expansion concrete along the longitudinal self-stressing tendons (1) is 3.0 MPa to 5.0 MPa.