Method for replacing railway bridge support of micro-cantilever beam cut-off stone

Abstract

The application relates to a method for replacing a bearing of an existing railway bridge with a micro roof beam cutting cushion stone, which comprises the following steps: cutting the bridge cushion stone and removing the cut part, the cut part corresponding to the bearing to be replaced; arranging a temporary support at the bearing to be replaced; removing the bearing to be replaced, and installing a replacement bearing on the bridge beam body at the position of the original bearing to be replaced; installing a replacement cushion stone on the bridge cushion stone at the position of the original cut part; and removing the temporary support, so that the bridge beam body is supported on the replacement bearing. Based on the method, by partially cutting and removing the bridge cushion stone under the bearing to be replaced, a working space can be provided for the dismounting of the bearing to be replaced and the installation of the replacement bearing, the bridge beam body does not need to be greatly lifted, the disturbance to the bridge structure is greatly reduced, the cables, steel rails and other components of the bridge do not need to be dismounted during the bearing replacement process, the work amount can be reduced, the construction efficiency is improved, and the influence on the railway operation is greatly reduced.

Description

Technical Field

[0001] This application relates to the field of bridge bearing replacement technology, and in particular to a method for replacing bearings of existing railway bridges with micro-top beam cut pad stones. Background Technology

[0002] Bridge bearings are key components connecting the superstructure and substructure of a bridge, and are used to transfer the loads from the superstructure. For railway bridges, bearings are subjected to high-density, high-axle-load loads for extended periods, which can easily lead to problems such as excessive rotation angle, excessive displacement, bolt shearing, bearing corrosion, bearing detachment, and bearing eccentricity. To ensure the safe operation of railways, the corresponding bearings must be replaced in a timely manner.

[0003] For existing railway bridges constructed in the past, the pre-embedded bolts connecting the bearings are all embedded in the beam body. When replacing bearings, whether removing the old bearings or installing new ones, the beam must be lifted to a certain height so that the pre-embedded bolts at the bottom of the beam are higher than the top of the bearings before replacement can be carried out, causing significant disturbance to the bridge structure. Therefore, before bearing replacement, it is necessary to remove and relocate cables, release rail stress, remove rail fasteners, and remove ballast at the beam joints. After the bearing replacement is completed, the track and the corresponding removed components also need to be restored. This results in a large workload, low construction efficiency, and a significant impact on railway operations. Summary of the Invention

[0004] Therefore, it is necessary to provide a method for replacing the existing railway bridge bearings with micro-top beam cutting pad stones to address the above-mentioned technical problems.

[0005] A method for replacing existing railway bridge bearings with micro-beam cut pad stones, the method comprising: cutting the bridge pad stone to separate the cut portion from the main body of the bridge pad stone, and removing the cut portion, the cut portion corresponding to the bearing to be replaced; setting a temporary support at the location of the bearing to be replaced; removing the bearing to be replaced, installing a replacement bearing on the bridge beam at the original location of the bearing to be replaced, and connecting the replacement bearing to the bridge beam; installing a replacement pad stone on the bridge pad stone at the original location of the cut portion, and connecting the replacement pad stone to the replacement bearing and the main body of the bridge pad stone; removing the temporary support, so that the bridge beam is supported on the replacement bearing.

[0006] The above-mentioned bearing replacement method, based on the bearing replacement method of the embodiments of this application, provides working space for the disassembly of the bearing to be replaced and the installation of the replacement bearing by partially cutting and removing the bridge pad stone under the bearing to be replaced. It does not require a large lifting of the bridge beam, greatly reducing the disturbance to the bridge structure. Thus, it is not necessary to disassemble and assemble the bridge's cables, rails and other components during the bearing replacement process, which can reduce the workload, improve construction efficiency and reduce the impact on railway operation.

[0007] In some embodiments, the connection between the cut portion and the support to be replaced is severed before the cut portion is removed; the connection between the support to be replaced and the bridge beam is severed before the support to be replaced is removed.

[0008] In some embodiments, disconnecting the bearing to be replaced from the bridge beam includes: removing the connecting nut between the bearing to be replaced and the pre-embedded bolt at the bottom of the bridge beam; and lowering the bearing to be replaced onto the area where the original cut portion was located on the bridge pad stone, so that the pre-embedded bolt is relatively removed from the connecting hole of the bearing to be replaced.

[0009] In some embodiments, the thickness of the cut portion is not less than the length of the portion of the pre-embedded bolt exposed in the bridge beam.

[0010] In some embodiments, a temporary support is provided at the bearing to be replaced, including: installing the temporary support at the bearing to be replaced, such that one end of the temporary support is supported on the bottom of the bridge beam and the other end is supported on the pier where the bridge pad stone is located.

[0011] In some embodiments, temporary supports are placed at the bearing to be replaced before or after the bridge pad stones are cut.

[0012] In some embodiments, the method further includes: after setting a temporary support at the bearing to be replaced, lifting the temporary support by 1-5 mm so that the bridge beam is subjected to the force of the temporary support.

[0013] In some embodiments, connecting the replacement pad stone to the replacement support and the main body of the bridge pad stone includes: setting an assembly hole on the bottom surface of the area where the original cut part of the bridge pad stone is located, and setting a first internal thread sleeve in the assembly hole; the replacement pad stone has a pre-set through hole, so that the through hole corresponds to the connection hole of the first internal thread sleeve and the replacement support; and the connecting bolt passes through the connection hole and the through hole in sequence, and then engages with the thread of the first internal thread sleeve.

[0014] In some embodiments, a second internal threaded sleeve is pre-installed in the through hole, and the bolt is threadedly engaged with the second internal threaded sleeve.

[0015] In some of these embodiments, a wire saw is used to cut the bridge pad stones. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the disassembly of the support to be changed in some embodiments of this application, showing the support replacement method.

[0017] Figure 2 This is a schematic diagram illustrating the installation of the replacement support in some embodiments of this application.

[0018] Figure 3This is a schematic diagram illustrating the setup of temporary support components in some embodiments of the support replacement method of this application.

[0019] Figure label:

[0020] 1. Bridge beam; 2. Bearing to be replaced; 3. Bridge pad stone; 31. Cut section; 32. Main body; 321. Assembly hole; 4. Pier; 5. Temporary support; 6. Replacement bearing; 7. Replacement pad stone; 71. Through hole. Detailed Implementation

[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0022] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0023] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0027] In some embodiments, please refer to Figure 1 and Figure 2 This application provides a method for replacing the bearings of existing railway bridges with micro-top beam cutting pad stones, used to replace the bearings of existing railway bridges. The bearing replacement method includes:

[0028] Step S100: Cut the bridge pad stone 3 so that the cut part 31 of the bridge pad stone 3 is separated from the main body part 32 of the bridge pad stone 3, and remove the cut part 31, which corresponds to the support 2 to be replaced.

[0029] In the structure of a railway bridge, the bridge beam 1 is supported by piers 4, and a bearing is provided between the piers 4 and the bridge beam 1. Bridge pad stones 3 are provided on the piers 4 for installing and supporting the bearings. Therefore, the bearing replacement method of this application is based on cutting the bridge pad stones 3.

[0030] Based on the area corresponding to the bearing 2 to be replaced on the bridge pad 3, the area to be cut is determined, ensuring that the bearing 2 is within the cut area. After cutting the bridge pad 3, the cut portion 31 is obtained, and the bearing 2 to be replaced is positioned on the cut portion 31, separating the cut portion 31 from the main body 32 of the bridge pad 3. This separation means that the cut portion 31 and the main body 32 are no longer connected, forming independent structures. Then, based on the separation of the cut portion 31 from the main body 32 of the bridge pad 3, the cut portion 31 can be removed.

[0031] In some examples, a wire saw can be used to cut the bridge pad stone 3. According to the predetermined cutting range, a cuboid or approximately cuboid cut portion 31 can be obtained.

[0032] It is understood that the bridge pad stone 3 in this embodiment is a common term in the industry for the component installed on the bridge pier 4 and supporting the bearing. It is mainly used to refer to the component and does not necessarily mean that the component is made of stone. For example, in this embodiment, the bridge pad stone 3 can be made of concrete.

[0033] Step S200: Install a temporary support 5 at the support 2 to be replaced.

[0034] The temporary support 5 can be installed before or after cutting the bridge pad stone 3. Therefore, step S200 can be performed before or after step S100. In this embodiment, the temporary support 5 can optionally be installed before cutting the bridge pad stone 3 to support the bridge beam 1, thereby improving safety during the cutting process.

[0035] For example, the temporary support 5 can be a hydraulic jack, and multiple hydraulic jacks can be used to form the temporary support 5 described above.

[0036] Step S300: Remove the support 2 to be replaced, install the replacement support 6 on the bridge beam 1 at the original location of the support 2 to be replaced, and connect the replacement support 6 to the bridge beam 1.

[0037] After the cut portion 31 of the bridge pad stone 3 is removed, the bearing 2 to be replaced remains connected to the bridge beam 1. After the cut portion 31 is removed, a space is formed below the bearing 2 to be replaced, which allows for the removal of the bearing 2.

[0038] After removing the support 2 to be replaced, install the replacement support 6 at the position where the original support 2 was on the bridge beam 1, and connect the replacement support 6 to the bridge beam 1. For example, based on the space created after the cut portion 31 is removed, the connecting hole of the replacement support 6 can be inserted into the pre-embedded bolt at the bottom of the bridge beam 1, and then tightened with a nut.

[0039] Step S400: Install the replacement pad 7 onto the original cut portion 31 of the bridge pad 3, and connect the replacement pad 7 with the replacement support 6 and the main body 32 of the bridge pad 3.

[0040] After the replacement bearing 6 is installed in place, a replacement pad 7 is placed below the replacement bearing 6. The replacement pad 7 is embedded in the space formed after the cut portion 31 of the bridge pad 3 is removed, which is equivalent to replacing the cut portion 31 of the bridge pad 3. Together with the main body 32 of the bridge pad 3, it forms the overall structure of the bridge pad 3. After the replacement pad 7 is in place, it is connected to the replacement bearing 6 and the main body 32 of the bridge pad 3.

[0041] Step S500: Remove the temporary support 5 so that the bridge beam 1 is supported on the replacement support 6.

[0042] For example, if a hydraulic jack is used for the temporary support 5, it can be hydraulically controlled to retract a certain distance and separate from the bridge beam 1, and then the hydraulic jack can be removed. This transfers the load of the bridge beam 1 to the replacement support 6, so that the bridge beam 1 is supported by the replacement support 6.

[0043] In this way, the bearing replacement method based on the embodiments of this application, by partially cutting and removing the bridge pad stone 3 under the bearing 2 to be replaced, can provide working space for the disassembly of the bearing 2 to be replaced and the installation of the replacement bearing 6, without having to lift the bridge beam 1 significantly, greatly reducing the disturbance to the bridge structure. Thus, during the bearing replacement process, there is no need to disassemble or assemble the bridge's cables, rails and other components, which can reduce the workload and improve construction efficiency, and reduce the impact on railway operation.

[0044] In some examples, such as Figure 2 As shown, when setting up the temporary support 5, one end of the temporary support 5 is supported on the bottom of the bridge beam 1 and the other end is supported on the pier 4 where the bridge pad stone 3 is located.

[0045] In some embodiments, in step S100 above, before removing the cut portion 31, the connection between the cut portion 31 and the support 2 to be replaced is disconnected. Depending on the specific circumstances, disconnecting the cut portion 31 and the support 2 to be replaced can include different methods.

[0046] For example, if there is sufficient space, the connection between the cut portion 31 and the support 2 to be replaced can be made accessible by disassembling the connection structure between them, such as by removing nuts, bolts and other connecting components, so that the support 2 to be replaced can be detached from the pre-embedded bolts of the cut portion 31.

[0047] For example, if there is no operable space, such as no space for the support to be replaced 2 to be detached from the pre-embedded bolts of the cut portion 31, the connection structure between the cut portion 31 and the support to be replaced can be directly cut off, for example, by cutting off the pre-embedded bolts of the cut portion 31.

[0048] Furthermore, in step S300 above, before removing the support 2 to be replaced, the connection between the support 2 to be replaced and the bridge beam 1 is disconnected. Since the removal of the cut portion 31 creates an operable space below the support 2 to be replaced, the connection between the support 2 to be replaced and the bridge beam 1 can be disconnected by normally removing the nuts and bolts. Therefore, step S300 above, before removing the support 2 to be replaced, also includes the following sub-steps:

[0049] Step S310: Remove the connecting nut between the pre-embedded bolts at the bottom of the bridge beam 1 and the support 2 to be replaced.

[0050] Step S320: Lower the support 2 to be replaced onto the area where the original cut portion 31 was located on the bridge pad stone 3, so that the pre-embedded bolts are relatively removed from the connection hole of the support 2 to be replaced.

[0051] In some examples, the thickness of the cut portion 31 is not less than the length of the portion of the pre-embedded bolt exposed in the bridge beam 1.

[0052] Based on this, after the cut portion 31 is removed, the space below the support to be replaced 2 is not less than the length of the portion of the pre-embedded bolt exposed in the bridge beam 1 in the height direction, so that the support to be replaced 2 has sufficient space to move in the direction away from the bridge beam 1, so as to ensure that the pre-embedded bolt of the bridge beam 1 can be relatively removed from the connection hole of the support to be replaced 2.

[0053] In some embodiments, step S200 further includes: after setting a temporary support 5 at the support 2 to be replaced, lifting the temporary support 5 by 1~5mm, optionally 2~4mm, for example 3mm; so that the bridge beam 1 is subjected to force by the temporary support 5.

[0054] By lifting the temporary support 5, the load on the bridge beam 1 can be transferred to the temporary support 5, relieving the interaction between the bearing 2 to be replaced and the bridge beam 1 under stress, thus providing favorable conditions for the removal of the bearing 2 to be replaced. Furthermore, the lifting of the support is controlled within 1-5mm, slightly lifting the bridge beam 1. This is only used to relieve the interaction between the bearing 2 to be replaced and the bridge beam 1 under stress, and not to create operating space for replacing the bearing. Therefore, it will not cause substantial disturbance to the bridge structure, and there is no need to disassemble or install corresponding components on the bridge (such as the aforementioned cables and rails).

[0055] In some embodiments, step S400 above, connecting the replacement pad stone 7 to the replacement support 6 and the main body 32 of the bridge pad stone 3, includes:

[0056] Step S410: Set an assembly hole 321 on the bottom surface of the area where the original cut part 31 of the bridge pad stone 3 is located, and set a first internal thread sleeve in the assembly hole 321.

[0057] Since the cut portion 31 of the bridge pad stone 3 is removed, the pre-embedded bolts and other connecting structures existing on the cut portion 31 cannot be used to connect the replacement bearing 6. Therefore, an assembly hole 321 is provided on the bottom surface of the area where the cut portion 31 is removed. For example, the assembly hole 321 can be drilled on the bottom surface using a drilling device, and a first internal threaded sleeve is provided in the assembly hole 321.

[0058] The first inner threaded sleeve and the bridge pad stone 3 can be further fixed by pouring concrete or other curing materials. For example, if the diameter of the assembly hole 321 is larger than that of the first inner threaded sleeve, the area between the first inner threaded sleeve and the assembly hole 321 can be filled with concrete or other curing materials.

[0059] Step S420: Replace the pad stone 7 with a pre-set through hole 71, so that the through hole 71 corresponds to the connection hole of the first inner threaded sleeve and the replacement support 6.

[0060] During the preparation of the replacement pad stone 7, a through hole 71 can be pre-set. After the replacement pad stone 7 is installed in place, the through hole 71 corresponds to the assembly hole 321 (i.e., the first internal threaded sleeve) of the bridge pad stone 3 and the connection hole of the replacement support 6. In this embodiment, the replacement pad stone 7 may optionally adopt a metal block structure, such as a block structure made of steel to form the replacement pad stone 7. In this case, the through hole 71 can be pre-formed during the process of casting the steel to form the replacement pad stone 7.

[0061] Step S430: After the connecting bolt passes through the connecting hole and the through hole 71 in sequence, it engages with the first internal thread sleeve.

[0062] The main body 32 of the replacement pad stone 7, the replacement support 6, and the bridge pad stone 3 are connected by connecting bolts. That is, after the connecting bolts pass through the connecting hole and the through hole 71 in sequence, they are engaged with the first internal thread sleeve.

[0063] In some examples, a second internal threaded sleeve can be pre-installed in the through hole 71 of the replacement pad 7, and the bolt engages with the threaded second internal threaded sleeve to improve the reliability of the connection.

[0064] Understandably, if the replacement pad 7 is a metal block structure, the second internal threaded sleeve can actually be used as part of the replacement pad 7, and the through hole 71 can be directly set as an internal threaded hole. If a second internal threaded sleeve is additionally provided in the through hole 71, the second internal threaded sleeve can be welded to the through hole 71 of the replacement pad 7 to achieve the fixation of the second internal threaded sleeve and the replacement pad 7.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for replacing the bearings of existing railway bridges with micro-top beam cutting pad stones, characterized in that, include: Cut the bridge pad stone to separate the cut portion from the main body of the bridge pad stone, and remove the cut portion, which corresponds to the support to be replaced. A temporary support is installed at the location of the support to be replaced; Remove the support to be replaced, install the replacement support on the bridge beam at the original location of the support to be replaced, and connect the replacement support to the bridge beam. Install the replacement pad stone at the original location of the cut portion on the bridge pad stone, and connect the replacement pad stone to the replacement support and the main body of the bridge pad stone. Remove the temporary support, so that the bridge beam is supported on the replacement support.

2. The support replacement method according to claim 1, characterized in that, Before removing the cut portion, disconnect the cut portion from the support to be replaced; Before removing the support to be replaced, disconnect the support from the bridge beam.

3. The support replacement method according to claim 2, characterized in that, Disconnecting the support to be replaced from the bridge beam includes: Remove the connecting nut between the bearing to be replaced and the pre-embedded bolt at the bottom of the bridge beam; The replacement bearing is lowered onto the area where the original cut portion of the bridge pad stone was located, so that the pre-embedded bolts are relatively removed from the connection holes of the replacement bearing.

4. The support replacement method according to claim 3, characterized in that, The thickness of the cut portion is not less than the length of the portion of the pre-embedded bolt exposed in the bridge beam.

5. The support replacement method according to any one of claims 1 to 4, characterized in that, A temporary support is installed at the location of the support to be replaced, including: The temporary support is installed at the bearing to be replaced, with one end of the temporary support supporting the bottom of the bridge beam and the other end supporting the pier where the bridge pad stone is located.

6. The support replacement method according to claim 5, characterized in that, The temporary support is installed at the bearing to be replaced before or after the bridge pad stone is cut.

7. The support replacement method according to any one of claims 1 to 4, characterized in that, Also includes: After a temporary support is installed at the location of the support to be replaced, the temporary support is lifted by 1-5 mm so that the bridge beam is subjected to the force of the temporary support.

8. The support replacement method according to any one of claims 1 to 4, characterized in that, Connecting the replacement pad stone to the replacement support and the main body of the bridge pad stone includes: An assembly hole is provided on the bottom surface of the area where the original cut portion of the bridge pad stone is located, and a first internal threaded sleeve is provided in the assembly hole; The replacement pad has a pre-set through hole, which corresponds to the connection hole of the first inner threaded sleeve and the replacement support; The connecting bolt passes through the connecting hole and the through hole in sequence, and then engages with the first internal threaded sleeve.

9. The support replacement method according to claim 8, characterized in that, A second internal threaded sleeve is pre-installed inside the through hole, and the bolt is threadedly engaged with the second internal threaded sleeve.

10. The support replacement method according to any one of claims 1 to 4, characterized in that, The bridge pad stones were cut using a wire saw.

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