Tied-arch bridge and transformation method of existing tie bars of tied-arch bridge

Abstract

The invention discloses a tied arch bridge and an existing tie bar transformation method thereof.The tied arch bridge comprises an existing arch rib, an existing tie bar and an anchoring structure, the existing arch rib comprises a main arch rib and two side arch ribs, the two side arch ribs are located at the two ends of the main arch rib respectively and connected to the main arch rib, and the end of the existing tie bar is fixedly connected to the side arch ribs; the anchoring structure comprises an on-arch reinforcing structure, an anchor box structure and a new tie bar, the on-arch reinforcing structure is arranged on a top plate of the side arch rib, the on-arch reinforcing structure is provided with a first tie bar channel, the anchor box structure is connected to the end, away from the main arch rib, of the side arch rib and the on-arch reinforcing structure, and the anchor box structure is provided with a second tie bar channel communicated with the channel of the first tie bar; the new tie bar sequentially penetrates through the first tie bar channel and the second tie bar channel, and the end of the new tie bar is detachably connected to the anchor box structure. Therefore, the stress tie bar of the tied-arch bridge can be replaced, the service life of the tied-arch bridge is prolonged, and the safety of the tied-arch bridge is improved. The method is widely applied to the technical field of tied-arch bridges.

Description

Technical Field

[0001] This application relates to the technical field of tied arch bridges, and particularly relates to a tied arch bridge and a method for reconstructing an existing tie rod thereof. Background Art

[0002] A tied arch bridge refers to a combined structure bridge in which an arch, tie rods (or tie beams), suspenders, and bridge decks work together, characterized by the tie rods (or tie beams) bearing the horizontal thrust at the arch feet. Due to its beautiful structure, strong spanning ability, good adaptability to the site, and excellent economic and technical indicators, it has achieved rapid development and wide application in China since the 1990s. Limited by design concepts and technological development, early tie rod structures were mostly designed as non-replaceable permanent components, that is, the tie rods were tensioned and anchored using ordinary group anchors of parallel steel strands, anchored within the arch rib structure, the ducts within the anchorage section were grouted, and the tie rods were rigidly connected to the anchorage section as a whole, without reserving the ducts and operating space required for replacing the tie rods.

[0003] Since the tie rod structure is one of the most important load-bearing components of a tied arch bridge, it bears most of the horizontal thrust of the main span, and its reliability plays a decisive role in the overall safety of the arch bridge. When serious diseases occur in the tie rod itself, or after reaching the designed service life of 20 years, the tie rod should be replaced. However, the currently commonly used permanently anchored tie rod structure will make it very difficult to replace the tie rod. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. For this purpose, this application provides a tied arch bridge and a method for reconstructing an existing tie rod thereof, which can replace the load-bearing tie rod of the tied arch bridge and improve the service life and safety of the tied arch bridge.

[0005] The tied arch bridge according to the first aspect embodiment of this application includes:

[0006] An existing arch rib, including a main arch rib and two side arch ribs, the two side arch ribs are respectively located at both ends of the main arch rib and connected to the main arch rib;

[0007] An existing tie rod, the end of the existing tie rod is fixedly connected to the side arch rib;

[0008] An anchoring structure, including an upper-arch strengthening structure, an anchor box structure, and a new tie rod. The upper-arch strengthening structure is arranged on the top plate of the side arch rib. The upper-arch strengthening structure is provided with a first tie rod channel. The anchor box structure is connected to the end of the side arch rib away from the main arch rib. The anchor box structure is connected to the upper-arch strengthening structure. The anchor box structure is provided with a second tie rod channel communicating with the channel of the first tie rod. The new tie rod passes through the first tie rod channel and the second tie rod channel in sequence, and the end of the new tie rod is detachably connected to the anchor box structure.

[0009] The tied arch bridge according to the embodiments of the present application has at least the following beneficial effects: By providing a superstructure strengthening structure on the top plate of the side arch rib of the existing arch rib, providing an anchor box structure at one end of the side arch rib away from the main arch rib, and enabling the superstructure strengthening structure to be provided with a first tie rod channel and the anchor box structure to be provided with a second tie rod channel communicating with the first tie rod channel, a new tie rod is passed through the first tie rod channel and the second tie rod channel, and the end of the new tie rod is connected to the anchor box structure, so as to realize the stable connection of the new tie rod. By using the new tie rod to bear the force and force transmission of the existing tie rod, it is convenient to unload the force of the existing tie rod, and then realize the replacement and transformation of the stressed tie rod of the tied arch bridge, so as to improve the service life and safety of the tied arch bridge.

[0010] According to some embodiments of the present application, the superstructure strengthening structure is welded to the top plate of the side arch rib, and the anchor box structure is welded to one end of the side arch rib away from the main arch rib.

[0011] According to some embodiments of the present application, the anchor box structure includes a first partition plate, the first partition plate is located inside the anchor box structure and divides the anchor box structure into an upper box part and a lower box part, the upper box part is welded to the superstructure strengthening structure, and the lower box part is welded to the side arch rib.

[0012] According to some embodiments of the present application, the anchor box structure includes a bearing plate, the bearing plate is arranged at one end of the anchor box structure away from the side arch rib, the bearing plate is provided with a mounting hole, the mounting hole communicates with the second tie rod channel, the new tie rod is passed through the mounting hole, and an anchor is provided at the end of the new tie rod, and the new tie rod is installed on the bearing plate through the anchor.

[0013] According to some embodiments of the present application, the bearing plate is arranged at one end of the lower box part away from the side arch rib, the first partition plate is provided with a first positioning hole, the upper box part is provided with a tie rod conduit, the tie rod conduit extends obliquely downward along the length direction of the tied arch bridge, the tie rod conduit is a hollow pipe, and the new tie rod is successively passed through the tie rod conduit, the first positioning hole and the mounting hole.

[0014] According to some embodiments of the present application, the lower box part is provided with a second partition board and an anchoring rib plate. The second partition board is arranged at an interval from the bearing plate. The anchoring rib plate is located between the second partition board and the bearing plate. One end of the anchoring rib plate is connected to the second partition board, and the other end of the anchoring rib plate is connected to the bearing plate. The anchoring rib plate extends obliquely downward along the length direction of the tied arch bridge. The number of the anchoring rib plates is at least two, and at least two anchoring rib plates are arranged at intervals along the height direction of the tied arch bridge so as to form an installation space between two adjacent anchoring rib plates. The second partition board is provided with a second positioning hole in a penetrating manner. The new tie rod is sequentially penetrated through the tie rod conduit, the first positioning hole, the second positioning hole, the installation space and the installation hole.

[0015] According to some embodiments of the present application, the upper-arch strengthening structure includes an upper-arch side box, and the anchor box structure includes an anchor box side box. The upper-arch side box and the anchor box side box are arranged corresponding to each other. The upper-arch side box is located above the side box of the side arch rib. Concrete is respectively poured into the upper-arch side box and the anchor box side box.

[0016] According to some embodiments of the present application, the number of the upper-arch side boxes is two. The upper-arch strengthening structure further includes an upper-arch installation box. The two upper-arch side boxes are respectively arranged on both sides of the upper-arch installation box. The first tie rod channel is arranged in the upper-arch installation box. The number of the anchor box side boxes is two. The anchor box structure further includes an anchor box installation box. The two anchor box side boxes are respectively arranged on both sides of the anchor box installation box. The second tie rod channel is partially arranged in the anchor box installation box.

[0017] According to the method for retrofitting an existing tie rod of a tied arch bridge according to the second aspect embodiments of the present application, the retrofitting is carried out based on the tied arch bridge described in the first aspect above. The method for retrofitting the existing tie rod includes:

[0018] S100. Install the upper-arch strengthening structure and the anchor box structure on the side arch rib;

[0019] S200. Tension the new tie rod, and the two ends of the new tie rod are respectively installed on the anchor box structure;

[0020] S300. Monitor the force of the tied arch bridge;

[0021] S400. Unload the bearing capacity of the existing tie rod;

[0022] S500. Monitor the force of the tied arch bridge;

[0023] S600. Adjust the cable force of the new tie rod of the whole tied arch bridge.

[0024] According to the method for retrofitting an existing tie rod of a tied-arch bridge according to an embodiment of the present application, it has at least the following beneficial effects: It can replace the stressed tie rod of the tied-arch bridge and improve the service life and safety of the tied-arch bridge.

[0025] According to some embodiments of the present application, the new tie rod is tensioned symmetrically in stages, and the existing tie rod is unloaded symmetrically in stages; and / or,

[0026] The number of the new tie rods and the existing tie rods is multiple. After step S500 and before step S600, the method for retrofitting the existing tie rod of the tied-arch bridge further includes: repeating steps S200-S500.

[0027] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0028] The following further describes the present application in conjunction with the drawings and embodiments, where:

[0029] Figure 1 is a schematic structural diagram of a tied-arch bridge disclosed in an embodiment of the present application;

[0030] Figure 2 is a schematic structural diagram of an anchoring structure disclosed in an embodiment of the present application;

[0031] Figure 3 is a partial cross-sectional view of the anchoring structure disclosed in an embodiment of the present application from a top-down perspective;

[0032] Figure 4 is a partial cross-sectional view of the anchoring structure disclosed in an embodiment of the present application in a three-dimensional state;

[0033] Figure 5 is a cross-sectional view of the anchoring structure disclosed in an embodiment of the present application at the anchor box structure;

[0034] Figure 6 is a cross-sectional view of the anchoring structure disclosed in an embodiment of the present application at the arch strengthening structure;

[0035] Figure 7 is a flowchart of the method for retrofitting an existing tie rod of a tied-arch bridge disclosed in an embodiment of the present application.

[0036] Reference Signs:

[0037] 1. Anchoring structure; 11. Arch strengthening structure; 111. Upper side box of arch; 112. Installation box on arch; 113. Arch partition; 1130. Third positioning hole; 12. Anchor box structure; 121. First partition; 1210. First positioning hole; 122. Upper box part; 1221. Anchor box side box; 1222. Anchor box installation box; 123. Lower box part; 124. Bearing plate; 1240. Installation hole; 125. Tie rod conduit; 126. Second partition; 1260. Second positioning hole; 127. Anchor reinforcement plate; 1270. Installation space; 13. New tie rod; 131. Anchor; 14. Maintenance manhole.

[0038] 2. Tie rod arch bridge; 21. Main arch rib; 22. Side arch rib; 23. Existing tie rod. Specific implementation manner

[0039] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0040] In the description of the present application, it should be understood that if terms such as "center", "middle part", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0041] In the description of the present application, the meaning of "several" is more than one, the meaning of "multiple" is more than two, "greater than", "less than", "exceeding", etc. are understood as not including the present number, and "above", "below", "within", etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0042] In the description of the present application, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0043] In the description of the present application, if there are descriptions with reference terms such as "as an implementation", "an embodiment", "some examples", "some embodiments", "schematic embodiments", "examples", "specific examples", "some examples", etc., it means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0044] The content of the present application will be described in detail below with reference to specific embodiments. It should be noted that the following description is only for illustrative purposes and not a specific limitation to the present application.

[0045] Please refer to Figures 1 to 6 , in a first aspect, an embodiment of the present application provides a tied-arch bridge 2, including an existing arch rib, an existing tie rod 23 (see Figure 6 ), and an anchoring structure 1. The existing arch rib includes a main arch rib 21 and two side arch ribs 22. The two side arch ribs 22 are respectively located at both ends of the main arch rib 21 and connected to the main arch rib 21. The end of the existing tie rod 23 is fixedly connected to the side arch rib 22. The anchoring structure 1 includes an upper-arch strengthening structure 11, an anchor box structure 12, and a new tie rod 13. The upper-arch strengthening structure 11 is arranged on the top plate of the side arch rib 22. The upper-arch strengthening structure 11 is provided with a first tie-rod channel. The anchor box structure 12 is connected to the end of the side arch rib 22 away from the main arch rib 21. The anchor box structure 12 is connected to the upper-arch strengthening structure 11. The anchor box structure 12 is provided with a second tie-rod channel communicating with the channel of the first tie rod. The new tie rod 13 passes through the first tie-rod channel and the second tie-rod channel in sequence. The end of the new tie rod 13 is detachably connected to the anchor box structure 12.

[0046] The tied-arch bridge 2 provided by the embodiment of the present application is configured such that an upper-arch strengthening structure 11 is arranged on the top plate of the side arch rib 22 of the existing arch rib, an anchor box structure 12 is arranged at one end of the side arch rib 22 away from the main arch rib 21, the upper-arch strengthening structure 11 is provided with a first tie rod channel, the anchor box structure 12 is provided with a second tie rod channel communicating with the first tie rod channel, a new tie rod 13 is passed through the first tie rod channel and the second tie rod channel, and the end of the new tie rod 13 is connected to the anchor box structure 12, thereby enabling a stable connection of the new tie rod 13. By having the new tie rod 13 bear the force and force transmission of the existing tie rod 23, the force on the existing tie rod 23 can be unloaded, and further, the replacement and transformation of the force-bearing tie rod of the tied-arch bridge 2 can be realized, so as to improve the service life and safety of the tied-arch bridge 2.

[0047] It should be noted that the new tie rod 13 mentioned in the embodiment of the present application refers to a tie rod newly added compared with the existing tie rod 23, and its purpose is to replace the existing tie rod 23 to bear the tensile load, so as to facilitate the subsequent unloading of the force on the existing tie rod 23, such that the existing tie rod 23 with diseases or reaching the service life no longer serves as the support and force transmission structure of the tied-arch bridge 2, thereby extending the service life of the tied-arch bridge 2 and improving the safety of the tied-arch bridge 2.

[0048] Please refer to Figures 4 to 6 , in some embodiments, the upper-arch strengthening structure 11 is welded to the top plate of the side arch rib 22, and the anchor box structure 12 is welded to one end of the side arch rib 22 away from the main arch rib 21. Thereby, the existing side arch rib 22 of the tied-arch bridge 2 can be utilized to provide stable support for the anchoring structure 1, and it is beneficial to improve the connection stability between the anchoring structure 1 and the side arch rib 22, so as to improve the structural reliability of the tied-arch bridge 2.

[0049] It can be understood that, in some other embodiments, the upper-arch strengthening structure 11 and the top plate of the side arch rib 22 may also be connected by means of anchoring connection or threaded locking connection, and the anchor box structure 12 and the side arch rib 22 may also be connected by means of anchoring connection or threaded locking connection.

[0050] Optionally, the anchor box structure 12 includes a first partition plate 121. The first partition plate 121 is located inside the anchor box structure 12 and divides the anchor box structure 12 into an upper box part 122 and a lower box part 123. The upper box part 122 is welded to the upper-arch strengthening structure 11, and the lower box part 123 is welded to the side arch rib 22.

[0051] In this way, the anchor box structure 12 adopts a structure of single box with double chambers in the upper and lower layers. The upper box part 122 and the lower box part 123 of the anchor box structure 12 are respectively connected to the arch upper strengthening structure 11 and the side arch rib 22, enabling the new tie rod 13 to have two force transmission paths under the action of the tensile load, including: new tie rod 13 tensioning → anchor box structure 12 → side arch rib 22, new tie rod 13 tensioning → anchor box structure 12 → arch upper structure → side arch rib 22. Thus, it can ensure that the tensile load received by the new tie rod 13 can be transmitted to the side arch rib 22, so as to ensure the force transmission effect of the new tie rod 13 and improve the overall structural reliability of the tied arch bridge 2.

[0052] Optionally, the first partition 121 is arranged in alignment with the top plate of the side arch rib 22, so that the lower box part 123 of the anchor box structure 12 corresponds to the side arch rib 22, and the upper box part 122 corresponds to the arch upper strengthening structure 11, that is, the upper box part 122 and the lower box part 123 of the anchor box structure 12 are respectively welded to different structures, which is beneficial to increasing the welding area between the anchor box structure 12 and the side arch rib 22 and the arch upper strengthening structure 11, and improving the structural reliability of the anchoring structure 1.

[0053] Please combine Figures 3 to 6 , optionally, the arch upper strengthening structure 11 includes an arch upper side box 111, the upper box part 122 of the anchor box structure 12 includes an anchor box side box 1221, the arch upper side box 111 and the anchor box side box 1221 are arranged corresponding to each other, the arch upper side box 111 is located above the side box of the side arch rib 22, and concrete is respectively poured into the arch upper side box 111 and the anchor box side box 1221. Thus, it can transmit force to the corresponding side arch rib 22 through the arch upper side box 111 and the anchor box side box 1221 filled with concrete, which is beneficial to finally conducting the tensile load received by the new tie rod 13 to the existing side arch rib 22 of the tied arch bridge 2, so as to improve the structural reliability of the tied arch bridge 2.

[0054] Optionally, the box walls of the arch upper side box 111 and the anchor box side box 1221 are formed by enclosing with steel plates, and shear studs are arranged on the inner walls of the steel plates, and the shear studs extend into the concrete, so that the concrete and the steel plates are connected through the shear studs, making it better for the concrete and the box walls to be connected as a whole, which is beneficial to improving the structural stability of the arch upper side box 111 and the anchor box side box 1221.

[0055] Optionally, the number of the arch upper side boxes 111 is two, the arch upper strengthening structure 11 further includes an arch upper installation box 112, the two arch upper side boxes 111 are respectively arranged on both sides of the arch upper installation box 112, the first tie rod channel is arranged in the arch upper installation box 112, the number of the anchor box side boxes 1221 is two, the anchor box structure 12 further includes an anchor box installation box 1222, the two anchor box side boxes 1221 are respectively arranged on both sides of the anchor box installation box 1222, the first partition 121 is arranged in the anchor box installation box 1222, and the second tie rod channel is partially arranged in the anchor box installation box 1222.

[0056] In this way, the new tie rod 13 is successively passed through the arch-mounted box 112 and the anchor box-mounted box 1222, which facilitates the disassembly, assembly, tensioning and adjustment of the new tie rod 13, so as to facilitate the maintenance of the new tie rod 13. When the new tie rod 13 reaches the service life or suffers from diseases, the first tie rod channel, the second tie rod channel and the tensioning allowable value space of the new tie rod 13 can also be used to realize the repeated replacement of the new tie rod 13, so as to greatly extend the service life of the tied arch bridge 2 and ensure the safety of the tied arch bridge 2.

[0057] In some embodiments, the anchor box structure 12 includes a bearing plate 124, the bearing plate 124 is arranged at one end of the anchor box structure 12 far from the side arch rib 22, the bearing plate 124 is provided with a mounting hole 1240, the mounting hole 1240 communicates with the second tie rod channel, the new tie rod 13 is passed through the mounting hole 1240, and an anchor 131 is provided at the end of the new tie rod 13. The new tie rod 13 is installed on the bearing plate 124 through the anchor 131.

[0058] In this way, the new tie rod 13 is firmly installed on the bearing plate 124 through the anchor 131 to support the new tie rod 13 through the anchor box structure 12. At the same time, the tension load is transmitted to the side arch rib 22 through the anchor box structure 12 or the arch-mounted strengthening structure 11, which can ensure the stable and reliable structure of the tied arch bridge 2. By adjusting the anchor 131, the tension load of the new tie rod 13 can be adjusted, which is beneficial to the disassembly and installation of the new tie rod 13.

[0059] Optionally, the anchor 131 can be an anchor head or a plug, etc.

[0060] Optionally, the bearing plate 124 is arranged at one end of the lower box part 123 far from the side arch rib 22. The first partition plate 121 is provided with a first positioning hole 1210. The upper box part 122 is provided with a tie rod conduit 125. The tie rod conduit 125 extends obliquely downward along the length direction of the tied arch bridge 2. The tie rod conduit 125 is a hollow pipe. The new tie rod 13 is successively passed through the tie rod conduit 125, the first positioning hole 1210 and the mounting hole 1240. On the one hand, the new tie rod 13 can be guided by arranging the tie rod conduit 125, so that the new tie rod 13 can be properly bent or inclined to adapt to the structural layout of the anchoring structure 1, so as to facilitate the transfer of the tension load borne by the new tie rod 13 to the side arch rib 22, and is beneficial to meeting the requirement that the tension load of the new tie rod 13 has two transmission paths, improving the structural reliability of the tied arch bridge 2. On the other hand, the new tie rod 13 can also be supported by the tie rod conduit 125 to facilitate the force transmission of the new tie rod 13.

[0061] Optionally, a second partition plate 126 and an anchoring rib plate 127 are provided in the lower box part 123. The second partition plate 126 is arranged at an interval from the bearing plate 124. The anchoring rib plate 127 is located between the second partition plate 126 and the bearing plate 124. One end of the anchoring rib plate 127 is connected to the second partition plate 126, and the other end of the anchoring rib plate 127 is connected to the bearing plate 124. The anchoring rib plate 127 extends obliquely downward along the length direction of the tied arch bridge 2. The number of the anchoring rib plates 127 is at least two, and at least two anchoring rib plates 127 are arranged at intervals along the height direction of the tied arch bridge 2 so as to form an installation space 1270 between two adjacent anchoring rib plates 127. The second partition plate 126 is provided with a second positioning hole 1260. The new tie rod 13 is sequentially passed through the tie rod conduit 125, the first positioning hole 1210, the second positioning hole 1260, the installation space 1270 and the installation hole 1240.

[0062] In this way, by providing the second partition plate 126 and the anchoring rib plate 127, the new tie rod 13 can be supported and guided. Moreover, the second tie rod channel is composed of the tie rod conduit 125, the first positioning hole 1210, the second positioning hole 1260 and the installation space 1270, etc. The new tie rod 13 is supported by the tie rod conduit 125, the first partition plate 121, the second partition plate 126, the anchoring rib plate 127 and the bearing plate 124, so that the new tie rod 13 can be more stable within the anchor box structure 12, which is beneficial to improving the structural stability of the tied arch bridge 2 and is beneficial to the installation and force transmission of the new tie rod 13.

[0063] It should be noted that the installation path of the new tie rod 13 needs to be adjusted according to the actual situation. For example, in some embodiments, when the outlet of the tie rod conduit 125 extends to communicate with the first positioning hole 1210, the new tie rod 13 is sequentially passed through the first tie rod channel, the tie rod conduit 125, the first positioning hole 1210, the second positioning hole 1260, the installation space 1270 and the installation hole 1240; when there is a certain distance between the outlet of the tie rod conduit 125 and the first positioning hole 1210, a second partition plate 126 is arranged between the first positioning hole 1210 and the tie rod conduit 125, and the new tie rod 13 is sequentially passed through the first tie rod channel, the tie rod conduit 125, the second positioning hole 1260, the first positioning hole 1210, the second positioning hole 1260, the installation space 1270 and the installation hole 1240; when the tie rod conduit 125 passes through the first partition plate 121, the new tie rod 13 is sequentially passed through the first tie rod channel, the tie rod conduit 125, the second positioning hole 1260, the installation space 1270 and the installation hole 1240 (see Figure 4 ).

[0064] Optionally, the strengthening structure 11 above the arch further includes a plurality of diaphragms 113 above the arch. The plurality of diaphragms 113 above the arch are arranged at intervals along the length direction of the tied arch bridge 2 in the installation box 112 above the arch. The diaphragms 113 above the arch are provided with third positioning holes 1130 therethrough, and the new tie rod 13 is passed through the third positioning holes 1130.

[0065] In this way, the third positioning holes 1130 of the plurality of diaphragms 113 above the arch can form a first tie rod channel. By supporting and guiding the new tie rod 13 through the diaphragms 113 above the arch, it is beneficial to make the new tie rod 13 more stable in the anchor box structure 12, so as to improve the structural stability of the tied arch bridge 2 and facilitate the installation and force transmission of the new tie rod 13. Exemplarily, the new tie rod 13 is sequentially passed through the third positioning holes 1130, the tie rod conduit 125, the second positioning hole 1260, the installation space 1270, and the installation hole 1240.

[0066] In some embodiments, the second diaphragm 126 extends upward from the lower box part 123 to the top plate of the upper box part 122. The tie rod conduit 125 is located in the upper box part 122 and passes through the second diaphragm 126. The diaphragms 113 above the arch and the second diaphragm 126 are respectively provided with maintenance manholes 14 to facilitate the maintenance of the anchoring structure 1 by the operators.

[0067] It should be noted that, in some embodiments, the maintenance manhole 14 of the diaphragm 113 above the arch can also be used as the support and guiding structure of the new tie rod 13, that is, the first tie rod channel can also be composed of the maintenance manhole 14. Exemplarily, the new tie rod 13 is sequentially passed through the maintenance manhole 14 of the diaphragm 113 above the arch, the tie rod conduit 125, the second positioning hole 1260, the installation space 1270, and the installation hole 1240 (see Figure 4 ).

[0068] In some embodiments, the number of the new tie rods 13 is multiple. For example, the number of the new tie rods 13 in the anchoring structure 1 is four. Correspondingly, the number of the first tie rod channels and the second tie rod channels is four. The four new tie rods 13 are arranged at intervals along the height direction and the width direction of the tied arch bridge 2. Thereby, the structural reliability of the tied arch bridge 2 can be improved, the load borne by a single new tie rod 13 can be reduced, which is beneficial to ensuring the force transmission performance and structural reliability of the new tie rod 13, and enables a single new tie rod 13 to have a separate tie rod channel, which is beneficial to the stable installation of the new tie rod 13 and the disassembly, assembly and maintenance of a single new tie rod 13.

[0069] Optionally, the number of the existing arch ribs and the anchoring structure 1 is multiple. The multiple anchoring structures 1 correspond to the multiple side arch ribs 22 one by one. For example, the number of the existing arch ribs can be two, among which the number of the main arch ribs 21 is two, and the number of the side arch ribs 22 and the tie rod retrofit structure is four. The four anchoring structures 1 correspond to the four side arch ribs 22 one by one. Thereby, the structural reliability of the tied arch bridge 2 can be ensured.

[0070] Please combine with Figure 7 , and refer to Figures 1 to 6 , Second aspect, the present application also provides a method for retrofitting an existing tie rod of a tied arch bridge, which is retrofitted based on the tied arch bridge 2 described in the first aspect above. The method for retrofitting the existing tie rod includes:

[0071] S100. Install the on-arch strengthening structure 11 and the anchor box structure 12 on the side arch rib 22.

[0072] S200. Tension the new tie rod 13, and both ends of the new tie rod 13 are respectively installed on the anchor box structure 12.

[0073] S300. Monitor the force of the tied arch bridge 2.

[0074] S400. Unload the bearing capacity of the existing tie rod 23.

[0075] S500. Monitor the force of the tied arch bridge 2.

[0076] S600. Adjust the cable force of the new tie rod 13 of the entire tied arch bridge 2.

[0077] In this way, by adding the new anchoring structure 1 and fixing it to the side arch rib 22 by using the on-arch strengthening structure 11 and the anchor box structure 12, a foundation is provided for the new tie rod 13 to transfer force. At the same time, the new tie rod 13 undertakes the force and force transfer of the existing tie rod 23, so as to facilitate unloading the force of the existing tie rod 23, and thus the force-bearing tie rod replacement and retrofit of the tied arch bridge 2 can be realized, improving the service life and safety of the tied arch bridge 2.

[0078] It can be understood that since the method for retrofitting the existing tie rod of the tied arch bridge is retrofitted based on the tied arch bridge 2 in the first aspect above, the method for retrofitting the existing tie rod of the tied arch bridge has the beneficial effects of the tied arch bridge 2 in the first aspect above, which will not be elaborated here.

[0079] In some embodiments, the new tie rod 13 is tensioned symmetrically in stages, and the existing tie rod 23 is unloaded symmetrically in stages. By adopting the methods of graded tensioning and graded unloading, construction safety can be guaranteed, and at the same time, damage to the new tie rod 13 and the existing tie rod 23 can be avoided, which is beneficial to ensuring the construction quality.

[0080] In some embodiments, the number of the new tie rod 13 and the existing tie rod 23 is multiple. After step S500 and before step S600, the method for retrofitting the existing tie rod of the tied arch bridge further includes: repeating steps S200 - S500.

[0081] That is to say, after a single new tie rod 13 is tensioned and installed, the corresponding single existing tie rod 23 is unloaded, and then another new tie rod 13 is tensioned and installed, and its corresponding existing tie rod 23 is unloaded until all new tie rods 13 are tensioned and installed and all existing tie rods 23 are unloaded. Thereby, the construction safety and construction quality can be ensured.

[0082] The embodiments of the present application have been described in detail above in conjunction with the accompanying drawings. However, the present application is not limited to the above embodiments. Various changes can be made without departing from the spirit of the present application within the scope of knowledge possessed by those of ordinary skill in the art. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A tied arch bridge, characterized in that Comprising: Existing arch ribs, including a main arch rib and two side arch ribs, the two side arch ribs are respectively located at both ends of the main arch rib and connected to the main arch rib; Existing tie rods, the ends of the existing tie rods are fixedly connected to the side arch ribs; An anchoring structure, including an upper-arch strengthening structure, an anchor box structure and a new tie rod, the upper-arch strengthening structure is arranged on the top plate of the side arch rib, the upper-arch strengthening structure is provided with a first tie rod passage, the anchor box structure is connected to one end of the side arch rib away from the main arch rib, the anchor box structure is connected to the upper-arch strengthening structure, the anchor box structure is provided with a second tie rod passage communicating with the passage of the first tie rod, the new tie rod is sequentially passed through the first tie rod passage and the second tie rod passage, and the end of the new tie rod is detachably connected to the anchor box structure.

2. The tied arch bridge according to claim 1, wherein The upper-arch strengthening structure is welded to the top plate of the side arch rib, and the anchor box structure is welded to one end of the side arch rib away from the main arch rib.

3. The tied arch bridge according to claim 1 or 2, characterized in that, The anchor box structure includes a first partition board, the first partition board is located inside the anchor box structure and divides the anchor box structure into an upper box part and a lower box part, the upper box part is welded to the upper-arch strengthening structure, and the lower box part is welded to the side arch rib.

4. The tied-arch bridge according to claim 3, characterized in that, The anchor box structure includes a bearing plate, the bearing plate is arranged at one end of the anchor box structure away from the side arch rib, the bearing plate is provided with a mounting hole, the mounting hole communicates with the second tie rod passage, the new tie rod is passed through the mounting hole, an anchor is provided at the end of the new tie rod, and the new tie rod is installed on the bearing plate through the anchor.

5. The tied arch bridge according to claim 4, characterized in that, The bearing plate is arranged at one end of the lower box part away from the side arch rib, the first partition board is provided with a first positioning hole, the upper box part is provided with a tie rod conduit, the tie rod conduit extends obliquely downward along the length direction of the tied arch bridge, the tie rod conduit is a hollow pipe, and the new tie rod is sequentially passed through the tie rod conduit, the first positioning hole and the mounting hole.

6. The tied-arch bridge according to claim 5, characterized in that, The lower box part is provided with a second partition board and anchoring rib plates, the second partition board is arranged at an interval with the bearing plate, the anchoring rib plates are located between the second partition board and the bearing plate, one end of the anchoring rib plate is connected to the second partition board, the other end of the anchoring rib plate is connected to the bearing plate, the anchoring rib plates extend obliquely downward along the length direction of the tied arch bridge, the number of the anchoring rib plates is at least two, and at least two anchoring rib plates are arranged at intervals along the height direction of the tied arch bridge so as to form a mounting space between two adjacent anchoring rib plates, the second partition board is provided with a second positioning hole, and the new tie rod is sequentially passed through the tie rod conduit, the first positioning hole, the second positioning hole, the mounting space and the mounting hole.

7. The tied-arch bridge according to claim 1, characterized in that, The upper-arch strengthening structure includes an upper-arch side box, the anchor box structure includes an anchor box side box, the upper-arch side box and the anchor box side box are correspondingly arranged, the upper-arch side box is located above the side box of the side arch rib, and concrete is respectively poured into the upper-arch side box and the anchor box side box.

8. The tied-arch bridge according to claim 7, wherein, The number of the upper-arch side boxes is two. The upper-arch strengthening structure further includes an upper-arch installation box. The two upper-arch side boxes are respectively arranged on both sides of the upper-arch installation box. The first tie rod channel is arranged in the upper-arch installation box. The number of the anchor box side boxes is two. The anchor box structure further includes an anchor box installation box. The two anchor box side boxes are respectively arranged on both sides of the anchor box installation box. The second tie rod channel is partially arranged in the anchor box installation box.

9. A method for retrofitting an existing tie rod of a tied-arch bridge, characterized in that, Based on the tied arch bridge as described in any one of claims 1-8, the method for reconstructing the existing tie rod includes: S100. Install the upper-arch strengthening structure and the anchor box structure on the side arch ribs; S200. Tension the new tie rod, and the two ends of the new tie rod are respectively installed on the anchor box structure; S300. Monitor the force-bearing of the tied arch bridge; S400. Unload the bearing capacity of the existing tie rod; S500. Monitor the force-bearing of the tied arch bridge; S600. Adjust the cable force of the new tie rod of the whole tied arch bridge.

10. The method for retrofitting an existing tie rod of a tied-arch bridge according to claim 9, characterized in that, The new tie rod is tensioned symmetrically in stages, and the existing tie rod is unloaded symmetrically in stages; and / or, The number of the new tie rods and the existing tie rods is multiple. After step S500 and before step S600, the method for reconstructing the existing tie rod of the tied arch bridge further includes: repeating steps S200-S500.

Images