Pre-pressing device and pre-pressing method for high pier support

Abstract

The present application relates to the technical field of high-pier construction, and particularly relates to a pre-pressing device and a pre-pressing method for a high-pier support. The pre-pressing device for the high-pier support comprises a spliced load distribution beam, a jack, a steering device and a plurality of steel strands. The spliced load distribution beam is arranged on the top surface of a support group, and the jack is matched with the pier. One end of the plurality of steel strands is arranged on the spliced load distribution beam, and the other end of the plurality of steel strands is arranged through the steering device. The steering device is configured to be capable of gathering the plurality of steel strands arranged through the steering device to form a cable bundle, and the cable bundle is connected with the jack. The jack is used to tension the steel strands, so that the steel strands transmit the tension to the spliced load distribution beam, thereby exerting pressure on the support to complete the pre-pressing of the support. In this way, the pre-pressing of the support can be completed by using only one jack, the construction steps are simple, the construction efficiency is high, and the pre-pressing method is easy to control.

Description

Technical Field

[0001] This invention relates to the field of bridge pier construction technology, and more specifically, to a preloading device and preloading method for high pier supports. Background Technology

[0002] In the cantilever construction of bridges, scaffolding is typically erected for the No. 0 pier of high-pier bridges before cast-in-place construction. After the scaffolding is installed on the pier, it needs to be pre-stressed to eliminate inelastic deformation. The elastic deformation value of the scaffolding after pre-stressing also provides a reference for subsequent construction, thereby improving the safety of the scaffolding.

[0003] The traditional preloading method is the surcharge method, which involves placing a certain amount of weight, such as water bags or sandbags, on top of the support structure. This method often requires cranes for high-altitude operations, which is cumbersome, labor-intensive, and time-consuming. Furthermore, working at heights increases construction risks.

[0004] The commonly used method in construction is the jack preloading method. This method often requires multiple jacks to work simultaneously, which is difficult to control and requires a large number of jacks, making it unfavorable for control. Summary of the Invention

[0005] The present invention aims to provide, for example, a preloading device and a preloading method for high pier supports, which addresses the shortcomings of the above-mentioned support preloading methods by using only one jack to complete the support preloading, with simple construction steps, easy control, and high construction efficiency.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a preloading device for high pier supports, used to apply preload to multiple supports on a pier, wherein a support group is respectively arranged on both sides of the top of the pier, and each support group includes multiple supports arranged side by side, comprising:

[0008] Spliced ​​load-bearing beams, jacks, and multiple steel strands;

[0009] The spliced ​​load-bearing beam is set on the top surface of the support assembly, and the jack cooperates with the bridge pier;

[0010] One end of each of the steel strands is disposed on the spliced ​​load-bearing beam, and the other end of each of the steel strands is threaded through the steering device. The steering device is configured to gather the steel strands after they have passed through the steering device to form a steel cable bundle. The steel cable bundle is connected to the jack.

[0011] The jack tensions the steel strands, allowing them to transfer the tension to the spliced ​​load-bearing beam, thereby applying pressure to the support structure and completing the pre-stressing of the support structure.

[0012] The preloading device for high pier supports in this scheme allows the spliced ​​load-sharing beam to be placed on supports fixed to both sides of the pier. This serves as a force-transfer structure, transferring the tension from the steel strands during tensioning to the supports, thus applying uniform pressure and simulating a uniformly distributed load. The steering device converges and anchors multiple bundles of steel strands from the spliced ​​load-sharing beam into a single bundle, enabling the tensioning of all steel strands to be completed with just one jack, thus achieving preloading of the supports. Compared to the traditional jack-based preloading method, this scheme simplifies the construction procedure, facilitates control of jack usage, and improves construction efficiency for preloading supports before the construction of the 0# pier bridge.

[0013] In an alternative embodiment, the steering device is located directly below the support assembly in a direction perpendicular to the support assembly.

[0014] In an optional embodiment, the steering device includes a receiving plate and a plurality of pipes;

[0015] The inlet of the pipe is located at the top of the receiving plate, and the pipe extends away from the receiving plate after passing through the bottom surface of the receiving plate.

[0016] Along the direction from the inlet to the outlet of the pipeline, after the multiple pipelines pass through the bottom surface of the receiving plate, the horizontal distance between the centers of adjacent pipelines gradually decreases until they abut against each other, so that the multiple pipelines as a whole present a form in which they are gradually converged from a dispersed arrangement to the center.

[0017] The steel strands are threaded one-to-one through the pipes.

[0018] In an optional embodiment, the conduit includes an outer pipe, an inner pipe, and a plurality of rolling elements;

[0019] The inner tube passes through the interior of the outer tube, and all the rolling elements are movably disposed within the wall of the inner tube; the steel strand passes through the inner tube.

[0020] Along the radial direction of the inner tube, one side of the rolling element can movably abut against the inner wall of the outer tube, and the other side of the rolling element can abut against the outside of the steel strand.

[0021] In an optional embodiment, an annular gap is provided between the outer tube and the inner tube, the width of which is less than the diameter of the rolling element and greater than the radius of the rolling element.

[0022] In an optional embodiment, a portion of the rolling elements are arranged circumferentially to form a rolling ring along the circumferential direction of the inner tube;

[0023] Along the extension direction of the inner tube, multiple rolling rings are arranged at equal intervals; and when the steel strand is in the pipe, each of the rolling elements can contact the steel strand without directly contacting the inner wall of the inner tube.

[0024] In an optional embodiment, the steering device further includes a sleeve, an upper steel plate, a lower steel plate, and a fixing device;

[0025] The preloading device for the high pier support also includes a reaction beam installed on the pier;

[0026] The sleeve is sequentially inserted through the upper steel plate, the reaction beam, and the lower steel plate;

[0027] After passing through the bottom surface of the receiving plate, the multiple pipes are all installed inside the sleeve;

[0028] The receiving plate is located on top of the upper steel plate, and the top of the sleeve can abut against the bottom of the receiving plate;

[0029] The jack is located below the lower steel plate, and the jack is used to connect to the steel cable bundle that passes through the sleeve;

[0030] The fixing device is connected to the upper steel plate, the reaction beam and the lower steel plate respectively.

[0031] In an optional embodiment, the spliced ​​load-bearing beam includes multiple crossbeams, multiple longitudinal beams, and multiple connecting devices;

[0032] Along a first preset direction, multiple crossbeams are detachably connected in sequence via the connecting device to form a crossbeam assembly; the multiple crossbeam assemblies are arranged side by side;

[0033] Along a second preset direction, multiple longitudinal beams are detachably connected in sequence via the connecting device to form a longitudinal beam assembly; the multiple longitudinal beam assemblies are arranged side by side;

[0034] The first preset direction and the second preset direction have an angle between them, so that the crossbeam assembly and the longitudinal beam assembly are arranged in an intersecting manner, and adjacent crossbeam assemblies and longitudinal beam assemblies are detachably connected by the connecting device;

[0035] The crossbeam is used to overlap the support, and the multiple steel strands can be connected one-to-one with the multiple longitudinal beams.

[0036] In an optional embodiment, the connecting device includes at least two interface portions; the spliced ​​load-bearing beam also includes fasteners;

[0037] The interface is configured to engage with the crossbeam or the longitudinal beam;

[0038] The fasteners are connected to the crossbeams and the interface portion respectively, or the fasteners are connected to the longitudinal beams and the interface portion respectively, so as to achieve detachable connection between adjacent crossbeams, between adjacent longitudinal beams, and between adjacent crossbeams and longitudinal beams.

[0039] Secondly, the present invention provides a preloading method, the preloading method being based on the preloading device for high pier supports described in any of the foregoing embodiments, the preloading method comprising at least the following steps:

[0040] S01. A bundle of steel cables is formed by passing multiple steel strands sequentially from top to bottom through the spliced ​​load-bearing beam and extending towards the bottom of the pier; the bundle of steel cables is connected to the jack.

[0041] S02. The jack tensions the steel strands, and the tension of the steel strands is transmitted to the spliced ​​load-bearing beam, thereby applying pressure to the support and completing the pre-stressing of the support.

[0042] This preloading method, based on the aforementioned preloading device for high pier supports, allows for the tensioning of all steel strands on a single longitudinal side of the pier using only one jack, thus enabling preloading of multiple supports on the longitudinal side of the pier from the outside. This preloading method offers advantages such as ease of construction, material savings, and excellent preloading results.

[0043] The beneficial effects of the embodiments of the present invention include, for example:

[0044] This preloading device for high pier supports includes a spliced ​​load-sharing beam, jacks, a steering mechanism, and multiple steel strands. The spliced ​​load-sharing beam is positioned on top of the support assembly, and the jacks work in conjunction with the pier. One end of each steel strand is attached to the spliced ​​load-sharing beam on top of the support assembly, while the other end is threaded through the steering mechanism to anchor it as a single cable bundle. This cable bundle is connected to the jacks. Tensioning the cable bundle with the jacks allows the steel strands to transfer tension to the spliced ​​load-sharing beam, thereby applying pressure to the support assembly to complete the preloading. This preloading device for high pier supports offers advantages such as simple structure, convenient construction, and improved work efficiency while ensuring effective preloading.

[0045] Compared with the traditional surcharge method, this preloading method simplifies construction, reduces workload, and lowers construction risks. Compared with the existing jack preloading method, it can reduce the number of jacks used, facilitate the control of jack tensioning force, and better control the preloading effect of the support. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the preloading device for a high pier support according to an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the preloading device for a high pier support according to another perspective of an embodiment of the present invention;

[0049] Figure 3 This is a structural schematic diagram from another perspective of the preloading device for high pier support according to an embodiment of the present invention;

[0050] Figure 4 This is a schematic diagram of the structure of the spliced ​​load-bearing beam according to an embodiment of the present invention;

[0051] Figure 5 This is a partial schematic diagram of the spliced ​​load-bearing beam according to an embodiment of the present invention;

[0052] Figure 6 This is a schematic diagram of the steering device according to an embodiment of the present invention;

[0053] Figure 7 This is an assembly diagram of the steering device according to an embodiment of the present invention;

[0054] Figure 8 This is a schematic diagram of the pipe group in the steering device according to an embodiment of the present invention;

[0055] Figure 9 This is a schematic diagram of the structure of a single pipe according to an embodiment of the present invention;

[0056] Figure 10 This is a flowchart of the pre-compression method according to an embodiment of the present invention.

[0057] Icons: 10 - Preloading device for high pier support; 100 - Spliced ​​load-sharing beam; 101 - Crossbeam assembly; 102 - Longitudinal beam assembly; 110 - Crossbeam; 120 - Longitudinal beam; 130 - Connecting device; 131 - Interface section; 140 - Fastener; 200 - Jack; 300 - Steel strand; 400 - Steering device; 401 - Reserved through hole; 402 - Bolt hole; 410 - Support plate; 42 0-Pipeline; 421-Outer pipe; 422-Inner pipe; 423-Rolling element; 424-Annular gap; 425-Rolling ring; 430-Sleeve; 440-Upper steel plate; 450-Lower steel plate; 460-Fixing device; 21-Pier; 22-Support assembly; 23-Support; 24-Corner; 25-Reaction beam; 26-Anchorage; 30-Cable bundle; A-First preset direction; B-Second preset direction. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0059] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0061] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0062] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0063] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0064] Please refer to Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a preloading device 10 for high pier supports, used to apply preload to multiple supports 23 on a bridge pier 21. A support group 22 is respectively provided on both sides of the top of the bridge pier 21, and each support group 22 includes multiple supports 23 arranged side-by-side. The preloading device 10 for high pier supports includes:

[0065] 100-piece splice load-bearing beam, 200-piece jacks, 400-piece steering device, and 300-piece steel strands;

[0066] The spliced ​​load-sharing beam 100 is set on the top surface of the support group 22, and the jack 200 cooperates with the pier body of the pier 21.

[0067] One end of a plurality of steel strands 300 is set on the spliced ​​load-sharing beam 100, and the other end of the plurality of steel strands 300 is threaded through a steering device 400. The steering device 400 is configured to gather the plurality of steel strands 300 after they are threaded through the steering device 400 to form a steel cable bundle 30, which is connected to the jack 200.

[0068] Jack 200 tensions the steel strand 300 so that the steel strand 300 can transfer the tension to the spliced ​​load-sharing beam 100, thereby applying pressure to the support 23 to complete the pre-stressing of the support 23.

[0069] The preloading device 10 for the high pier support in this scheme can place the spliced ​​load-sharing beam 100 on the supports 23 fixed on both sides of the pier 21, serving as a force transmission structure to transfer the tension of the steel strands 300 to the supports 23 during tensioning, thereby applying uniform pressure to the supports 23 and simulating a uniformly distributed load. The steering device 400 converges and anchors the multiple bundles of steel strands 300 through the spliced ​​load-sharing beam 100 into one bundle, thus enabling the tensioning of all steel strands 300 with only one jack 200, completing the preloading of the supports 23. Compared with the traditional jack-support preloading method, this scheme has the advantages of simplifying the construction procedure, making it easier to control the use of the jacks 200, and improving construction efficiency in order to preload the supports 23 before the construction of the high pier bridge #0.

[0070] Please continue reading. Figures 1 to 9 To learn more about the structural details of the preloading device 10 used for high pier supports.

[0071] As shown in the figure, the preloading device 10 for the high pier support should be used in conjunction with the support 23 at pier #0 and the jack 200. The supports 23 requiring preloading are installed on both longitudinal sides of the pier 21, with three supports 23 installed on each side. The supports 23 are fixed to the pier 21 by brackets 24. It should be noted that in this embodiment, the pier 21 has two support groups 22 that are symmetrical to each other and located on the same plane on both longitudinal sides. Each support group 22 has three supports 23 arranged side by side and located on the same plane.

[0072] Regarding the specific structure of the support group 22, those skilled in the art should be able to make reasonable selections and designs according to actual needs. No specific restrictions are made here. For example, the number of supports 23 in the support group 22 on both sides of the longitudinal direction of the pier 21 may be different. The support groups 22 on both sides may not be located on the same horizontal plane, or the supports 23 in the support group 22 may be two, four, etc., to suit different actual situations. This is just an example and no specific restrictions are made.

[0073] Furthermore, a reaction beam 25 is fixedly installed on the pier 21 at a certain distance below the support 23 using brackets 24 to provide the reaction force when the steel strands 300 are tensioned. A steering device 400 is mounted on the reaction beam 25, and the jack 200 cooperates with the steering device 400. Optionally, the steering device 400 is located directly below the support assembly 22 in a direction perpendicular to the support group 22. This ensures that the steel cable bundle 30 formed after the multiple steel strands 300 are anchored is located at the center of the projection of the support group 22; thus, the length of each steel strand 300 is the same from the spliced ​​load-sharing beam 100 to the steel cable bundle 30, and the tension from the jack 200 can be evenly applied to each steel strand 300, allowing the spliced ​​load-sharing beam 100 to evenly apply pressure to each support 23, ensuring uniform load distribution.

[0074] The spliced ​​load-sharing beam 100 is placed on the supports 23 fixed on both sides of the pier 21, serving as a force transmission structure to transfer the tension of the steel strands 300 to the supports 23, thereby applying uniform pressure to the supports 23 to simulate a uniformly distributed load. Because the multiple supports 23 in the support group 22 are all located on the same plane, and the spliced ​​load-sharing beam 100 is placed on the supports 23 in the support group 22, the tension from the jacks 200 can be evenly applied to the multiple supports 23 through the multiple steel strands 300, thus ensuring that the supports 23 are subjected to uniform preload.

[0075] Please see Figure 3 , Figure 4 and Figure 5 In this embodiment, the spliced ​​load-bearing beam 100 includes multiple crossbeams 110, multiple longitudinal beams 120, and multiple connecting devices 130.

[0076] Along the first preset direction A, multiple crossbeams 110 are detachably connected in sequence via connecting devices 130 to form a crossbeam assembly 101; the multiple crossbeam assemblies 101 are arranged side by side;

[0077] Along the second preset direction B, multiple longitudinal beams 120 are detachably connected in sequence via connecting devices 130 to form a longitudinal beam assembly 102; the multiple longitudinal beam assemblies 102 are arranged side by side;

[0078] The first preset direction A and the second preset direction B have an included angle, so that the crossbeam assembly 101 and the longitudinal beam assembly 102 are arranged crosswise, and adjacent crossbeam assemblies 101 and longitudinal beam assemblies 102 are detachably connected by connecting devices 130; the crossbeam 110 is used to overlap the support 23, and multiple steel strands 300 can be connected one-to-one with multiple longitudinal beams 120. Optionally, the first preset direction A and the second preset direction B remain perpendicular to each other.

[0079] Specifically, the crossbeam 110 is attached to the support 23, forming a structural form in which the support 23 serves as the fulcrum and the crossbeam 110 serves as the load-bearing structure, bearing the reaction force generated by the support 23 during the tensioning of the steel strand 300.

[0080] Anchors 26 are fixed on multiple longitudinal beams 120, allowing steel strands 300 to pass through and anchoring one end of the steel strands 300. The longitudinal beams 120 bear the pressure generated by the steel strands 300 during the preloading process of the support 23.

[0081] It should be noted that both the crossbeam 110 and the longitudinal beam 120 bear large concentrated forces. Therefore, the longitudinal beam 120 and the crossbeam 110 should have a certain bending stiffness in the same direction as the force to avoid large deformation and loss of load-bearing capacity.

[0082] Furthermore, from Figure 4 and Figure 5 As can also be seen in this embodiment, the connecting device 130 includes at least two interface portions 131; the spliced ​​load-bearing beam 100 also includes fasteners 140; the interface portions 131 are configured to snap into the crossbeam 110 or the longitudinal beam 120; the fasteners 140 are connected to the crossbeam 110 and the interface portions 131 respectively, or the fasteners 140 are connected to the longitudinal beam 120 and the interface portions 131 respectively, so as to realize the detachable connection between adjacent crossbeams 110, between adjacent longitudinal beams 120, and between adjacent crossbeams 110 and longitudinal beams 120.

[0083] Specifically, the connecting device 130 is connected to the crossbeam 110 / longitudinal beam 120 via the interface 131, and then the connecting device 130 and the crossbeam 110 / longitudinal beam 120 are fixedly connected using fasteners 140, thereby connecting all components to form an integral structure. Due to the different positions of the connecting device 130, such as... Figure 4For corner, edge, and interior positions, correspondingly, a connector 130 with two, three, or four interface sections 131 should be used.

[0084] Optionally, the fastener 140 is a fixing bolt. Specifically, the interface portion 131 is provided with a mounting hole with internal threads, through which the fixing bolt passes and connects to the crossbeam 110 / longitudinal beam 120. The bolt is at least threaded into the mounting hole.

[0085] It should be noted that the number and arrangement of the 300 steel strands shown in this plan are not unique. Due to the detachable and assembleable nature of the prefabricated load-bearing beam, the prefabricated load-bearing beam can be combined into different specifications and forms according to the number and arrangement requirements of the 300 steel strands to adapt to actual use.

[0086] Please see Figure 6 and Figure 7 As shown in the figure, the steering device 400 includes a receiving plate 410, a sleeve 430, an upper steel plate 440, a lower steel plate 450, a fixing device 460, and multiple pipes 420. Optionally, the receiving plate 410 is rectangular in shape.

[0087] The upper steel plate 440, the reaction beam 25, and the lower steel plate 450 are all provided with corresponding reserved through holes 401.

[0088] During installation and use, the receiving plate 410 and the sleeve 430 are fitted and fixed together. The sleeve 430 passes through the reserved through holes 401 of the upper steel plate 440, the reaction beam 25, and the lower steel plate 450 from top to bottom. Because the width of the receiving plate 410 is larger than the diameter of the reserved through hole 401, the receiving plate 410 cannot pass through the round hole of the upper steel plate 440, so it is placed above the upper steel plate 440. The upper steel plate 440 and the lower steel plate 450 are located on the top and bottom surfaces of the reaction beam 25, respectively. The upper steel plate 440 and the lower steel plate 450 can be fixed to the reaction beam 25 using the fixing device 460, thus completing the installation of the steering device 400.

[0089] like Figure 8 As shown, multiple pipes 420 are arranged according to actual use to form a steel strand 300 pipe 420 system. In this scheme, a 4×3 pattern of steel strand 300 arrangement is used as an example.

[0090] The inlet of pipe 420 is located at the top of the receiving plate 410. After passing through the bottom surface of the receiving plate 410, pipe 420 extends away from the receiving plate 410. The pipe 420 has a spatial curve. Along the direction from the inlet to the outlet of pipe 420, after multiple pipes 420 pass through the bottom surface of the receiving plate 410, the horizontal distance between the centers of adjacent pipes 420 gradually decreases until they touch each other (at this time, the latter half of the adjacent pipes 420 remains unchanged), so that the multiple pipes 420 present a form of gradually converging from a dispersed arrangement to the center. Multiple steel strands 300 are threaded one-to-one in the multiple pipes 420.

[0091] This is because the anchor points of the steel strands 300 on the spliced ​​load-bearing beam 100 are spaced apart. When they converge at the turning device 400, the inlets of the pipes 420 are distributed to each other, which is conducive to the smooth transition of the steel strands 300. Subsequently, the steel strands 300 converge together with the direction of the pipes 420, so that the tensioning of all the steel strands 300 can be completed using a single jack 200.

[0092] It can be seen that one end of the pipe 420 passes through the receiving plate 410, and the remaining part is located inside the sleeve 430, which protects the pipe 420. Multiple pipes 420 are installed inside the sleeve 430 after passing through the bottom surface of the receiving plate 410. The receiving plate 410 is located on top of the upper steel plate 440, and the top of the sleeve 430 can abut against the bottom of the receiving plate 410. The jack 200 is located below the lower steel plate 450 and is used to connect with the steel cable bundle 30 that passes through the sleeve 430. The fixing device 460 is connected to the upper steel plate 440, the reaction beam 25 and the lower steel plate 450 respectively to realize the connection between the steering device 400 and the reaction beam 25. The reaction beam 25 is fixed to the pier 21 by the bracket 24.

[0093] Optionally, the fixing device 460 is a bolt, and the upper steel plate 440, the reaction beam 25, and the lower steel plate 450 are all provided with bolt holes 402 to mate with the bolts. After the bolts pass through the bolt holes 402 of the upper steel plate 440, the bolt holes 402 of the reaction beam 25, and the bolt holes 402 of the lower steel plate 450 in sequence, the receiving plate 410, the sleeve 430, the upper steel plate 440, the lower steel plate 450, and the multiple pipes 420 are fixed to the reaction beam 25.

[0094] Optionally, in this embodiment, the steering device 400 includes two mutually symmetrical fixing devices 460, which are symmetrically arranged on both sides of the reserved through hole 401 in the radial direction, so that the steering device 400 can maintain a fixed engagement with the reaction beam 25.

[0095] Please see Figure 9 As can be seen from the figure, pipe 420 includes an outer pipe 421, an inner pipe 422, and multiple rolling elements 423;

[0096] The inner tube 422 passes through the interior of the outer tube 421, and the rolling elements 423 are movably disposed in the wall of the inner tube 422; the steel strand 300 passes through the inner tube 422; along the radial direction of the inner tube 422, one side of the rolling element 423 can movably abut against the inner wall of the outer tube 421, and the other side of the rolling element 423 can abut against the outside of the steel strand 300.

[0097] Furthermore, there is an annular gap 424 between the outer tube 421 and the inner tube 422. The width of the annular gap 424 is smaller than the diameter of the rolling element 423 and larger than the radius of the rolling element 423.

[0098] The annular gap 424 between the inner tube 422 and the outer tube 421 allows a portion of the rolling element 423 to pass through the inner tube 422 and be exposed in the area through which the steel strand 300 passes, while the remaining portion lies within the gap between the inner tube 422 and the outer tube 421. Therefore, the distance of the annular gap 424 should be less than the diameter of the rolling element 423 and greater than the radius of the rolling element 423, so that the rolling element 423 does not completely detach from the gap area, and also prevents the rolling element 423 from completely passing through the inner tube 422 and detaching from the pipe 420.

[0099] As can also be seen from the figure, along the circumferential direction of the inner tube 422, some rolling elements 423 are arranged circumferentially to form rolling rings 425; along the extension direction of the inner tube 422, multiple rolling rings 425 are equidistantly distributed; and when the steel strand 300 is in the pipe 420, there are rolling elements 423 that can contact the steel strand 300 without directly contacting the inner wall of the inner tube 422.

[0100] Specifically, the rolling element 423 should be spherical. Alternatively, the rolling element 423 can be a steel ball. The rolling element 423 forms a rolling ring 425 around the inner tube 422, and then the rolling ring 425 is equidistantly distributed along the pipe 420. The arrangement density of the rolling elements 423 should ensure that, under normal use, the steel strand 300 has a rolling element 423 in contact with it in the pipe 420, without directly contacting the inner tube 422.

[0101] Furthermore, the beneficial effects of the rolling element 423 are as follows: the steel strand 300 will elongate under tension, and due to the change in the shape of the steel strand 300, the steel strand 300 will exert a compressive force on the inside of the pipe 420 when the steel strand 300 is tensioned. If the steel strand 300 is in direct contact with the inner pipe 422, sliding friction will be generated when the steel strand 300 elongates, which will limit the elongation of the steel strand 300, cause the loss of prestress, and affect the tensioning effect.

[0102] The rolling element 423 in the pipe 420 cannot move due to the constraint of the inner tube 422, but it can rotate on its own. The steel strand 300 is changed to contact the rolling element 423. The movement during elongation drives the rolling element 423 to roll, and the sliding friction is transformed into rolling friction. The friction force is greatly reduced, which can reduce the prestress loss and improve the tensioning prestress effect.

[0103] In use, multiple bundles of steel strands 300 pass through the anchors 26 on the spliced ​​load-bearing beam 100 from top to bottom, and then reach the turning device 400 on the reaction beam 25. Through the pipe 420 of the turning device 400, they finally converge into one bundle and are tensioned by the jack 200 to complete the pre-stressing of the support 23.

[0104] Secondly, please refer to Figure 10 The present invention provides a preloading method, which is based on the preloading device 10 for high pier supports according to any of the foregoing embodiments. The preloading method includes at least the following steps:

[0105] S01. Multiple steel strands 300 pass through the spliced ​​load-bearing beam 100 from top to bottom, extending towards the bottom of the pier 21 and converging into a bundle of steel cables 30; the bundle of steel cables 30 is connected to the jack 200.

[0106] S02, jack 200 tensions the steel strand 300, and the tension of the steel strand 300 is transferred to the spliced ​​load-sharing beam 100, thereby applying pressure to the support 23 and completing the pre-stressing of the support 23.

[0107] This preloading method, based on the aforementioned preloading device 10 for high pier supports, allows for the tensioning of all steel strands 300 using only one jack 200 on one longitudinal side of the pier 21, thus enabling preloading of multiple supports 23 on one longitudinal side of the pier 21 from the outside. This preloading method offers advantages such as convenient construction, material savings, and good preloading effect.

[0108] In summary, the embodiments of the present invention provide a preloading device 10 and a preloading method for high pier supports, which have at least the following advantages:

[0109] Compared with the traditional surcharge method, it can simplify construction, reduce workload and construction risk. Compared with the existing jack preloading method, it can reduce the number of jacks used, make it easier to control the tensioning force of the jacks, and better control the preloading effect of the support.

[0110] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A preloading device for a high pier support, used to apply preload to multiple supports (23) on a pier (21), wherein a support group (22) is respectively provided on both sides of the top of the pier (21), and each support group (22) includes multiple supports (23) arranged side by side, characterized in that, include: The spliced ​​load-bearing beam (100), jacks (200), steering device (400) and multiple steel strands (300); The spliced ​​load-bearing beam (100) is disposed on the top surface of the support assembly (22); One end of each of the plurality of steel strands (300) is disposed on the spliced ​​load-bearing beam (100), and the other end of each of the plurality of steel strands (300) is passed through the steering device (400), and the steering device (400) is configured to gather the plurality of steel strands (300) after passing through the steering device (400) to form a steel cable bundle (30); the steel cable bundle (30) is connected to the jack (200); The jack (200) tensions the steel strand (300) so that the steel strand (300) transmits the tension to the spliced ​​load-sharing beam (100), thereby applying pressure to the support (23) to complete the pre-stressing of the support (23); The steering device (400) is located directly below the support group (22) in a direction perpendicular to the support group (22); A reaction beam (25) is fixedly installed on a pier (21) at a certain distance below the support (23) using a corbel; a steering device (400) is set on the reaction beam (25), and the jack (200) cooperates with the steering device (400); The spliced ​​load-bearing beam (100) includes multiple crossbeams (110) and multiple longitudinal beams (120); the crossbeams (110) are used to overlap the support (23), and multiple steel strands (300) can be connected one-to-one with the multiple longitudinal beams (120).

2. The preloading device for high pier supports according to claim 1, characterized in that: The steering device (400) includes a receiving plate (410) and a plurality of pipes (420). The inlet of the pipe (420) is located at the top of the receiving plate (410), and the pipe (420) extends away from the receiving plate (410) after passing through the bottom surface of the receiving plate (410). Along the direction from the inlet to the outlet of the pipe (420), after the multiple pipes (420) pass through the bottom surface of the receiving plate (410), the horizontal distance between the centers of adjacent pipes (420) gradually decreases until they abut against each other, so that the multiple pipes (420) as a whole present a form that gradually converges from a dispersed arrangement to the center; Multiple steel strands (300) are threaded one-to-one through multiple pipes (420).

3. The preloading device for high pier supports according to claim 2, characterized in that: The pipe (420) includes an outer pipe (421), an inner pipe (422), and multiple rolling elements (423). The inner tube (422) passes through the interior of the outer tube (421), and the rolling elements (423) are all movably disposed in the wall of the inner tube (422); the steel strand (300) passes through the inner tube (422); Along the radial direction of the inner tube (422), one side of the rolling element (423) can be movably abutted against the inner wall of the outer tube (421), and the other side of the rolling element (423) can abut against the outside of the steel strand (300).

4. The preloading device for high pier supports according to claim 3, characterized in that: There is an annular gap (424) between the outer tube (421) and the inner tube (422), the width of which is less than the diameter of the rolling element (423) and greater than the radius of the rolling element (423).

5. The preloading device for high pier supports according to claim 3, characterized in that: Along the circumferential direction of the inner tube (422), a portion of the rolling element (423) is arranged circumferentially to form a rolling ring (425). Along the extension direction of the inner tube (422), multiple rolling rings (425) are arranged at equal intervals; and when the steel strand (300) is in the pipe (420), the rolling element (423) can contact the steel strand (300) without directly contacting the inner wall of the inner tube (422).

6. The preloading device for high pier supports according to claim 3, characterized in that: The steering device (400) also includes a sleeve (430), an upper steel plate (440), a lower steel plate (450), and a fixing device (460). The preloading device for the high pier support also includes a reaction beam (25) installed on the pier (21). The sleeve (430) is sequentially fitted with the upper steel plate (440), the reaction beam (25) and the lower steel plate (450). After passing through the bottom surface of the receiving plate (410), the multiple pipes (420) are all installed inside the sleeve (430); The receiving plate (410) is located on top of the upper steel plate (440), and the top of the sleeve (430) can abut against the bottom of the receiving plate (410). The jack (200) is located below the lower steel plate (450), and the jack (200) is used to connect to the steel cable bundle (30) that passes through the sleeve (430); The fixing device (460) is connected to the upper steel plate (440), the reaction beam (25) and the lower steel plate (450) respectively.

7. The preloading device for high pier supports according to any one of claims 1-6, characterized in that: The spliced ​​load-bearing beam (100) includes multiple crossbeams (110), multiple longitudinal beams (120), and multiple connecting devices (130). Along a first preset direction (A), multiple crossbeams (110) are detachably connected in sequence via the connecting device (130) to form a crossbeam assembly (101); the multiple crossbeam assemblies (101) are arranged side by side; Along the second preset direction (B), multiple longitudinal beams (120) are detachably connected in sequence through the connecting device (130) to form a longitudinal beam assembly (102); the multiple longitudinal beam assemblies (102) are arranged side by side; The first preset direction (A) and the second preset direction (B) have an included angle so that the crossbeam assembly (101) and the longitudinal beam assembly (102) are arranged in an intersecting manner, and adjacent crossbeam assemblies (101) and longitudinal beam assemblies (102) are detachably connected by the connecting device (130). The crossbeam (110) is used to overlap the support (23), and the multiple steel strands (300) can be connected one-to-one with the multiple longitudinal beams (120).

8. The preloading device for high pier supports according to claim 7, characterized in that: The connecting device (130) includes at least two interface portions (131); the spliced ​​load-bearing beam (100) also includes fasteners (140). The interface (131) is configured to engage with the crossbeam (110) or the longitudinal beam (120); The fasteners (140) are connected to the crossbeams (110) and the interface (131) respectively, or the fasteners (140) are connected to the longitudinal beams (120) and the interface (131) respectively, so as to realize the detachable connection between adjacent crossbeams (110), between adjacent longitudinal beams (120), and between adjacent crossbeams (110) and longitudinal beams (120).

9. A pre-compression method, characterized in that: The preloading method is based on the preloading device for high pier supports according to any one of claims 1-8, and the preloading method includes at least the following steps: S01. A bundle of steel cables (300) is formed by passing through the spliced ​​load-bearing beam (100) from top to bottom and extending toward the bottom of the pier (21); the bundle of steel cables (30) is connected to the jack (200); S02, the jack (200) tensions the steel strand (300), and the tension of the steel strand (300) is transmitted to the spliced ​​load-sharing beam (100), thereby applying pressure to the support (23) and completing the pre-stressing of the support (23).

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