High-ductility concrete support

Abstract

The utility model discloses a high-ductility concrete support which comprises an upper support plate, a lower support plate and a connecting shaft connecting the upper support plate and the lower support plate, and the upper support plate and the lower support plate are formed by combining high-ductility concrete and reinforcing steel bars. The lower surface of the upper support plate is a convex spherical surface, the upper surface of the lower support plate is a concave spherical surface, the convex spherical surface is matched with the concave spherical surface, and a sliding layer is arranged between the convex spherical surface and the concave spherical surface. Compared with an existing steel support, the high-ductility concrete swivel support has the advantages that the size precision error is small, stress between the upper support plate and the lower support plate is more uniform, and therefore the friction coefficient can be obviously reduced, and bridge swivel can be completed by selecting equipment with small traction force.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge rotation technology, and particularly relates to a high-ductility concrete bearing. Background Art

[0002] With the continuous development of science and technology, new construction techniques have emerged in bridge construction, and rotation construction is one of them. Bridge rotation construction refers to a construction method in which a bridge structure is fabricated (cast or spliced) at a non-designed axis position and then rotated into place. It can convert the operation above obstacles into an operation on the shore or near the ground. According to the rotation direction of the bridge structure, it can be divided into vertical rotation construction method, horizontal rotation construction method (abbreviated as vertical rotation method and horizontal rotation method, where the horizontal rotation method is divided into two types: rotation at the top of the pier and rotation at the bottom of the pier), and the method combining horizontal rotation and vertical rotation. Among them, the horizontal rotation method is the most widely used. Bridge rotation construction is applicable to special river channels that span deep valleys and rapid streams and are difficult to hoist, and has the characteristics of saving hoisting costs, being safe, reliable, and having good integrity. Recently, more and more railway-crossing and highway-crossing bridges have started to use the rotation construction method, which has the characteristics of not affecting the normal transportation of railways or highways, saving a large amount of scaffold wood or steel, being safe, reliable, and reducing construction difficulty.

[0003] The existing rotation bearing materials are mainly steel and rubber, with high production costs and large processing difficulties. Moreover, due to the large diameter of the rotation bearing, generally between 3 and 8 meters, this will lead to a reduction in the machining accuracy of the spherical working surface, and the upper seat plate and the lower seat plate of the bearing may not fit completely, resulting in uneven stress. Content of the Utility Model

[0004] In order to solve the above problems existing in the prior art, the utility model provides a high-ductility concrete bearing. The technical problems to be solved by the utility model are realized through the following technical solutions:

[0005] A high-ductility concrete bearing includes an upper bearing plate, a lower bearing plate, and a connecting shaft connecting the upper bearing plate and the lower bearing plate. The upper bearing plate and the lower bearing plate are composed of high-ductility concrete and steel bars. The lower surface of the upper bearing plate is a convex spherical surface, and the upper surface of the lower bearing plate is a concave spherical surface. The convex spherical surface is adapted to the concave spherical surface, and there is a sliding layer between the convex spherical surface and the concave spherical surface.

[0006] Further, the material of the sliding layer is polytetrafluoroethylene, polyurethane or epoxy resin; polytetrafluoroethylene, polyurethane or epoxy resin is respectively sprayed on the convex spherical surface of the upper bearing plate and the concave spherical surface of the lower bearing plate through a spraying process.

[0007] Further, the thickness of the sliding layer is 1 - 20 mm.

[0008] Further, mounting holes and mounting grooves are provided in the middle of the upper bearing plate and the lower bearing plate. The mounting grooves communicate with the mounting holes and are located at the upper end of the upper bearing plate and the lower end of the lower bearing plate. The connecting shaft is arranged in the mounting hole, and connecting pieces are threadedly connected to the upper and lower ends thereof, and the connecting pieces are located in the mounting grooves. There is a gap between the upper bearing plate and the connecting piece and the connecting shaft at its upper end portion.

[0009] Further, the bottom of the mounting groove is arc-shaped, and the surface of the connecting piece opposite to the bottom of the mounting groove is of a matching shape.

[0010] Further, the connecting shaft is formed by pouring a steel pipe and a steel bar grid inside the steel pipe. The connecting shaft extends out of the upper end surface of the upper bearing plate, and a cover plate is arranged at the upper end of the connecting shaft. The cover plate is composed of a portal part and horizontal parts arranged on both sides of the lower end of the portal part. There is a gap between the portal part and the connecting shaft. The horizontal part is fixed to the upper end surface of the upper bearing plate.

[0011] Further, the diameter of the connecting shaft is 0.1 - 3 m.

[0012] Further, a vertical displacement sensor is arranged on the lower bearing plate, and a rotational displacement sensor is arranged on the upper bearing plate.

[0013] Further, a plurality of grooves are circumferentially arranged on the upper end surface of the lower bearing plate, and force sensors are arranged in the grooves.

[0014] Advantages of the present utility model:

[0015] 1. For this high-ductility concrete rotating bearing, compared with the existing steel bearings, the dimensional accuracy error is small, and the force between the upper bearing plate and the lower bearing plate is more uniform, so that the friction coefficient can be significantly reduced, and equipment with a smaller traction force can be selected to complete the bridge rotation.

[0016] 2. On the contact spherical surfaces of the upper bearing plate and the lower bearing plate, a uniform sliding layer is sprayed by a spraying process respectively to replace the original assembled or pressed skateboard, which improves the machining accuracy of the sliding surface, and the friction coefficient of the sliding surface formed by the two sliding layers is much lower than that of the original skateboard, greatly reducing the frictional resistance between the upper bearing plate and the lower bearing plate.

[0017] The following will further describe the present utility model in detail with reference to the drawings and embodiments. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a high-ductility concrete bearing;

[0019] Figure 2 For Figure 1Schematic structural diagram of the connecting shaft therein;

[0020] Figure 3 is Figure 1 a sectional view of ([[]] Figure 3 the positions of the vertical displacement sensor, rotational displacement sensor and force sensor are shown therein);

[0021] Figure 4 Schematic structural diagram of another high-ductility concrete bearing;

[0022] Figure 5 is Figure 2 a schematic structural diagram of the connecting shaft in [[[]]]

[0023] Figure 6 Schematic structural diagram of the production mold of the lower bearing plate.

[0024] Explanation of reference numerals:

[0025] 1 - upper bearing plate; 2 - lower bearing plate; 3 - connecting shaft; 4 - anchor bolt; 5 - embedded bearing plate; 6 - bracket; 7 - sliding layer; 8 - upper mold; 9 - lower mold; 10 - connecting bolt; 11 - prefabricated shaft hole mold shaft; 12 - mounting hole; 13 - mounting groove; 14 - connecting piece; 15 - cover plate; 16 - assembly connection component; 17 - vertical displacement sensor; 18 - rotational displacement sensor; 19 - force sensor; 20 - groove. Detailed implementation manners

[0026] The following combines [[[]]] Figures 1 to 6 and specific embodiments to further describe the present invention in detail, but the implementation manners of the present invention are not limited thereto.

[0027] Please refer to [[[]]] Figure 1 , an embodiment of the present invention provides a high-ductility concrete bearing, specifically including an upper bearing plate 1, a lower bearing plate 2 and a connecting shaft 3 connecting the upper bearing plate 1 and the lower bearing plate 2; both the upper bearing plate 1 and the lower bearing plate 2 are formed by combining high-ductility concrete and steel bars through die casting and then precision machining; the upper bearing plate 1 is connected to the upper pier of the bridge through anchor bolts 4, and the lower bearing plate 2 is connected to the embedded bearing plate 5 through anchor bolts 4, and a bracket 6 is provided at the lower end of the embedded bearing plate 5; the lower surface of the upper bearing plate 1 is a convex spherical surface, the upper surface of the lower bearing plate 2 is a concave spherical surface, the convex spherical surface is adapted to the concave spherical surface, and a sliding layer 7 is provided between the convex spherical surface and the concave spherical surface.

[0028] High-ductility concrete refers to high-ductility concrete (abbreviated as HDC) with high strength, high toughness, high ductility, high crack resistance and high damage resistance. In this utility model, high-ductility concrete and steel bars are cast into the upper bearing plate 1 and the lower bearing plate 2 through a mold. That is, the upper bearing plate 1 and the lower bearing plate 2 are integrated. The rotating bearing with a steel bar high-ductility concrete structure can greatly reduce the production cost of enterprises and avoid the corrosion of the bearing in a humid environment. At the same time, the integrated structure can improve the processing accuracy, so that the upper bearing plate 1 and the lower bearing plate 2 can be closely fitted, reducing the friction coefficient and thus ensuring the working quality of the product.

[0029] It should be noted that the upper bearing plate 1 and the lower bearing plate 2 in this utility model can also be made of cast steel or engineered cementitious composite (abbreviated as ECC).

[0030] Specifically, the upper bearing plate 1 and the lower bearing plate 2 are produced in a standardized and large-scale manner through a mold. Taking the lower bearing plate 2 as an example, the production mold is described as follows: The mold includes an upper mold 8, a lower mold 9, connecting bolts 10 and a prefabricated shaft hole mold shaft 11. The specific shape and size of the mold are formulated according to application requirements. A steel bar skeleton is placed in the mold and high-ductility concrete is poured. Then it is vibrated and compacted and cured through special equipment. After reaching a certain strength, the mold is removed for curing. After reaching the design strength, it enters the next production link.

[0031] Furthermore, when the concrete pouring of the upper bearing plate 1 and the lower bearing plate 2 is completed and reaches the predetermined strength, polytetrafluoroethylene, polyurethane or epoxy resin is respectively sprayed on the convex spherical surface of the upper bearing plate 1 and the concave spherical surface of the lower bearing plate 2 through a spraying process to form a sliding layer 7. After further processing, it becomes the bearing rotation stress surface, replacing the skateboard with a large precision error formed by original assembly or pressing, making the upper bearing plate 1 and the lower bearing plate 2 closely fitted and reducing the frictional resistance during rotation. Preferably, the total thickness of the sliding layer 7 is 1 - 20 mm.

[0032] Preferably, the material of the sliding layer 7 is any one of polytetrafluoroethylene, polyurethane, and epoxy resin. These materials have extremely low friction coefficients, high bearing capacities, wear resistance, corrosion resistance, and high adhesion. Thus, the contact surfaces of the upper bearing plate 1 and the lower bearing plate 2 can be further processed to form the sliding layer 7, making the upper and lower stress surfaces of the bearing more evenly stressed, reducing the friction coefficient of the stress surface, and improving the bearing performance. Taking the polytetrafluoroethylene material as an example, compared with the steel bearing skateboard, the friction coefficient of the sliding surface formed by two polytetrafluoroethylene materials is much lower than that of the steel sliding surface. The sliding layer 7 formed by the spraying method has the characteristics of higher processing accuracy of the stress surface, smaller friction coefficient, and more uniform stress.

[0033] In an embodiment of the present utility model, mounting holes 12 and mounting grooves 13 are provided in the middle of the upper support plate 1 and the lower support plate 2. The mounting groove 13 communicates with the mounting hole 12 and is respectively located at the upper end of the upper support plate 1 and the lower end of the lower support plate 2. The connecting shaft 3 is arranged in the mounting hole 12, and both the upper and lower ends thereof have threads. The connecting piece 14 with internal threads is threadedly connected to both ends of the connecting shaft 3 and is located in the mounting groove 13. The upper end surface of the connecting piece 14 located at the upper end of the upper support plate 1 is lower than the upper end surface of the upper support plate 1 and is flush with the upper end surface of the upper support plate 1 after installing the protection plate. And there is a gap between the upper support plate 1 and the connecting piece 14 and the connecting shaft 3 at its upper end. The upper support plate 1 and the lower support plate 2 are connected into a whole by the connecting pieces 14 in the upper and lower support plates 2, and the upper support plate 1 can rotate smoothly along the connecting shaft 3, and the upper support plate 1 will not be separated from the lower support plate 2 during the rotation process, improving the anti-overturning ability and construction safety of the rotating support. Preferably, the connecting shaft 3 is made of a steel shaft, and the diameter of the connecting shaft 3 is 0.1 - 1 m.

[0034] Meanwhile, in order to ensure the strength of the upper support plate 1 and the lower support plate 2, the bottom surface of the mounting groove 13 is set to be arc-shaped to enable the rotating support to have a certain rotation angle, and correspondingly, the surface of the connecting piece 14 in contact with the support plate is also set to be a matching arc-shaped surface.

[0035] In addition, in order to prevent the threads in the connecting piece 14 from being damaged due to excessive force, resulting in unreliable rotation of the support, after adjusting the position of the connecting piece 14 to be appropriate, it is fixed to the connecting shaft 3 by means of V-shaped welding, and at the same time, damage to the mounting groove 13 can be avoided.

[0036] In another embodiment of the present utility model, when the rotating support is an extra-large tonnage rotating support, the connecting shaft 3 is fixed in the middle of the support embedded plate 5. The connecting shaft 3 is formed by pouring a steel pipe and a steel bar grid inside the steel pipe, and during pouring, it is poured into a whole together with the support 6 at the lower end of the support embedded plate 5, thus greatly improving the anti-overturning ability of the rotating support. The connecting shaft 3 extends out of the upper end surface of the upper support plate 1, and a cover plate 15 is arranged at the upper end of the connecting shaft 3. The cover plate 15 is composed of a portal part and horizontal parts arranged on both sides at the lower end of the portal part. There is a gap between the portal part and the connecting shaft 3, and the horizontal parts are fixed to the upper end surface of the upper support plate 1. When the bridge rotates, the upper support plate 1 and the cover plate 15 rotate along with the upper pier of the bridge along the lower support plate 2 and the connecting shaft 3.

[0037] Preferably, the diameter of the connecting shaft 3 is 0.1 - 3 m, which can meet the anti-overturning requirements of the super-large-tonnage slewing bearing. By thickening the diameter of the connecting shaft 3, the anti-shear and anti-overturning capabilities of the connecting shaft 3 during the bridge slewing can be improved. The larger the tonnage of the slewing bridge, the larger the diameter of the connecting shaft 3. Since the super-large-tonnage slewing bearing has a large diameter and is inconvenient for transportation, generally, the upper bearing 1 or the lower bearing 2 is divided into several parts for casting, assembled into one body through the assembling connection component 16 for finish machining, disassembled and transported to the construction site for secondary assembly. The assembling connection component 16 is generally a hoop.

[0038] During the specific construction of the super-large-tonnage slewing bearing, the steel pipe is arranged on the support 6. The support 6 is installed when the steel bars of the slewing bearing base layer are tied, and the steel bar grid arranged inside the steel pipe on the support 6 is connected to the steel bar grid of the slewing bearing base layer as a whole. After the installation is completed, check whether the steel pipe is displaced during construction. After meeting the technical requirements, pour concrete into the steel bar grid inside the steel pipe, the support 6, and the bearing base layer to ensure that the concrete inside the support 6, the steel pipe, and the bearing base layer at the bottom of the bearing embedded plate 5 is dense, so that the steel pipe becomes a part of the bearing base layer. After the concrete solidifies and its strength meets the construction requirements, remove the floating slurry on the bearing embedded plate 5 and the connecting shaft 3, then respectively sleeved the lower bearing plate 2 and the upper bearing plate 1 on the connecting shaft 3, and arrange a wear-resistant structure between the lower bearing plate 2 and the upper bearing. Finally, install the cover plate 15 on the connecting shaft 3, ensure that the contact surface between the cover plate 15 and the upper bearing plate 1 is flat and sealed with the contact surface of the upper bearing; at the same time, there are gaps between the contact surfaces of the cover plate 15 and the connecting shaft 3, ensuring that the upper bearing plate 1 can rotate smoothly along the connecting shaft 3.

[0039] Preferably, a vertical displacement sensor 17 is arranged on the lower bearing plate 2. The vertical displacement sensor 17 can be an infrared laser rangefinder to measure the displacement between the upper bearing plate 1 and the lower bearing, so as to judge the offset degree of the slewing bridge on the upper bearing plate 1.

[0040] Preferably, a rotational displacement sensor 18 is arranged on the upper bearing plate 1. The rotational displacement sensor 18 can be a laser displacement sensor to measure the rotational displacement of the upper bearing plate 1, so as to obtain the slewing degree of the slewing bridge in a timely manner.

[0041] Preferably, a force sensor 19 is arranged between the upper bearing plate 1 and the lower bearing plate 2; several grooves 20 are arranged circumferentially on the upper end surface of the lower bearing plate 2, and the force sensor 19 is located in the grooves 20 to measure whether the force on the upper bearing plate 1 is uniform.

[0042] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present utility model.

Claims

1. A high-ductility concrete bearing, characterized in that, It includes an upper bearing plate, a lower bearing plate, and a connecting shaft connecting the upper bearing plate and the lower bearing plate. The upper bearing plate and the lower bearing plate are composed of high-ductility concrete and steel bars. The lower surface of the upper bearing plate is a convex spherical surface, and the upper surface of the lower bearing plate is a concave spherical surface. The convex spherical surface is adapted to the concave spherical surface, and there is a sliding layer between the convex spherical surface and the concave spherical surface.

2. The high-ductility concrete bearing according to claim 1, characterized in that, The material of the sliding layer is polytetrafluoroethylene, polyurethane or epoxy resin. The polytetrafluoroethylene, polyurethane or epoxy resin is sprayed on the convex spherical surface of the upper bearing plate and the concave spherical surface of the lower bearing plate respectively through a spraying process.

3. The high-ductility concrete bearing according to claim 2, characterized in that, The thickness of the sliding layer is 1 to 20 mm.

4. The high-ductility concrete bearing according to claim 1, characterized in that, Installation holes and installation grooves are provided in the middle of the upper bearing plate and the lower bearing plate. The installation groove communicates with the installation hole and is located at the upper end of the upper bearing plate and the lower end of the lower bearing plate. The connecting shaft is arranged in the installation hole, and connecting pieces are threadedly connected to the upper and lower ends thereof, and the connecting pieces are located in the installation groove. There is a gap between the upper bearing plate and the connecting piece and the connecting shaft at its upper end.

5. The high-ductility concrete bearing according to claim 4, wherein The bottom of the installation groove is arc-shaped, and the surface of the connecting piece opposite to the bottom of the installation groove is of a matching shape.

6. The high-ductility concrete bearing according to claim 1, characterized in that, The connecting shaft is formed by pouring a steel pipe and a steel bar grid inside the steel pipe. The connecting shaft extends out of the upper end face of the upper bearing plate, and a cover plate is provided at the upper end of the connecting shaft. The cover plate is composed of a gable part and horizontal parts provided on both sides of the lower end of the gable part. There is a gap between the gable part and the connecting shaft. The horizontal part is fixed to the upper end face of the upper bearing plate.

7. The high-ductility concrete bearing according to claim 6, characterized in that, The diameter of the connecting shaft is 0.1 to 3 m.

8. The high-ductility concrete bearing according to claim 1, characterized in that A vertical displacement sensor is provided on the lower bearing plate, and a rotational displacement sensor is provided on the upper bearing plate.

9. The high-ductility concrete bearing according to claim 1, wherein, A plurality of grooves are circumferentially provided on the upper end face of the lower bearing plate, and force sensors are provided in the grooves.

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