A bridge bearing with replaceable friction pair

Abstract

A bridge bearing with replaceable friction pair, from top to bottom, includes an upper seat plate, a middle seat plate combination, and a lower seat plate stacked together, the middle seat plate combination is a top-bottom split structure, which is composed of an upper middle seat plate and a lower middle seat plate, a first friction pair matching between the upper surface of the upper middle seat plate and the lower surface of the upper seat plate, a second friction pair matching between the lower surface of the lower middle seat plate and the upper surface of the lower seat plate, the upper middle seat plate and the lower middle seat plate are connected as a whole by a mechanical connection mechanism, and a detachable connection mechanism is provided between the outer side of the upper middle seat plate and the upper seat plate. When the bearing friction pair material cannot meet the use requirements due to the combined effects of factors such as compression creep, friction and wear, the friction pair in the bearing can be replaced to achieve the continued function of the bridge bearing, thereby ensuring the use requirements of the bridge bearing for long-distance friction.

Description

Technical Field

[0001] The invention relates to the technical field of bridge bearings, in particular to a bridge bearing with replaceable friction pairs. Background Art

[0002] As the "joint" component connecting bridges and piers, bridge bearings have been widely used in highway, railway and other bridge projects. Bridge bearings bear the reaction force of the upper beam structure, and can also reduce the friction resistance when the beam rotates and slides. The drag reduction of bridge bearings is mainly achieved through the core component of the bearing - the friction pair. At present, the bearing friction pair is mainly composed of non-metallic slide plates and stainless steel plates. As the weakest component in the friction pair, the non-metallic slide plate has become a key component affecting the service life of the bearing.

[0003] In recent years, when some cross-sea and cross-river bridges were built, in order to ensure the normal passage of the route, cable-stayed bridges or suspension bridges with larger spans were generally selected. Due to the large span of the bridge, the deformation of the beam caused by temperature rise and vehicle operation will be large, which will drive the displacement of the bearing. The cumulative slip distance of the bearing friction pair during the life cycle is 1000km or even more than 3000km. Such a long friction distance cannot be achieved by relying on the wear resistance of the friction material. The only way to match the design life of the bridge is to replace the bridge bearing. However, directly replacing the bearing requires a lot of manpower and material resources, and the cost of replacing the bearing is high, the cycle is long, and the economic efficiency is poor. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a bridge bearing with a replaceable friction pair. When the bearing friction pair material cannot meet the use requirements due to the combined effects of compression creep, friction wear and other factors, the friction pair in the bearing can be replaced to enable the bridge bearing to continue to function, thereby ensuring the long-distance friction use requirements of the bridge bearing.

[0005] In order to achieve the above technical objectives, the technical solution adopted is: a bridge bearing with a replaceable friction pair, which includes an upper seat plate, a middle seat plate combination, and a lower seat plate stacked together from top to bottom, the middle seat plate combination is a top-down split structure, which is composed of an upper middle seat plate and a lower middle seat plate, a matching first friction pair is provided between the upper surface of the upper middle seat plate and the lower surface of the upper seat plate, a matching second friction pair is provided between the lower surface of the lower middle seat plate and the upper surface of the lower seat plate, the upper middle seat plate and the lower middle seat plate are connected as a whole by a mechanical connecting mechanism, and a detachable connecting mechanism is provided between the outer side of the upper middle seat plate and the upper seat plate.

[0006] The first friction pair and / or the second friction pair is a curved surface friction pair.

[0007] The mechanical connection mechanism is a combination of one or more matching boss groove mechanisms, keyway connection mechanisms, bolt connection mechanisms or dovetail mortise and tenon mechanisms.

[0008] The clearance between the components in the mechanical connection machine shall not exceed 2mm.

[0009] The boss and the groove in the boss-groove mechanism are conically matched, and the matching angle is 0-30°.

[0010] The beneficial effects of the present invention are: a bridge bearing with a replaceable friction pair function, in which the middle seat plate of the bearing is designed as a split structure, and when the exposed height of the non-metallic sliding plate in the bearing sliding friction pair does not meet the use requirements due to compression, wear, etc., the upper and lower parts of the middle seat plate can be separated by external force, and the friction pair to be replaced can be moved to the outside of the bearing body to complete the replacement of the bearing friction pair. By replacing the friction pair, the service life of the bearing can be extended, so that the service life of the bearing can be matched with the design life of the bridge; compared with replacing the bridge bearing, the method of replacing the bearing friction pair requires less manpower and material resources, has lower replacement costs, shorter time, and higher efficiency, and is an effective solution to the problem of ultra-long sliding distance of large-span bridge bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the cross-bridge structure of the support of Example 1;

[0012] Figure 2 is a schematic diagram of the horizontal and vertical structures of the support of Example 1;

[0013] Figure 3 yes Figure 2 An enlarged structural diagram of part Ⅰ;

[0014] Figure 4 This is a schematic diagram of the replacement connection structure of the bearing friction pair in Example 1;

[0015] Figure 5 is a schematic diagram of the cross-bridge structure of the support of Example 2;

[0016] Figure 6 is a schematic diagram of the longitudinal bridge structure of the support of Example 2;

[0017] Figure 7 is a schematic diagram of the seat plate matching structure of the support in Example 2;

[0018] Figure 8 is a schematic diagram of the cross-sectional structure of the shear key of the support plate in Example 2;

[0019] Fig. 9 is a schematic cross-sectional structure diagram of an I-shaped connecting key of a support plate in Embodiment 2;

[0020] Fig.10 yes Figure 5 An enlarged structural diagram of part II;

[0021] Fig.11 is a schematic diagram of the support friction pair replacement connection structure of Example 2;

[0022] Fig.12 is a schematic diagram of the cross-bridge structure of the support of Example 3;

[0023] Fig.13 is a schematic diagram of the longitudinal bridge structure of the support of Example 3;

[0024] Fig.14 Schematic diagram of the shear groove structure of the contact surface of the seat plate in the support of Example 3;

[0025] Fig.15 yes Fig.13 An enlarged structural diagram of part III;

[0026] Fig.16 This is a schematic diagram of the support friction pair replacement structure of Example 3;

[0027] In the figure: 1. upper seat plate; 2. middle seat plate assembly; 3. lower seat plate; 4. limit device; 5. connecting plate; 6. connecting bolt A; 7. middle seat plate shear key; 8. middle seat plate I-shaped connecting key; 11. first friction pair; 12. second friction pair; 13. keyway; 14. I-shaped groove; 21. upper middle seat plate; 22. lower middle seat plate; 23. filling channel; 24. connecting key block; 25. connecting bolt B; 26. plug. DETAILED DESCRIPTION

[0028] A bridge bearing with a replaceable friction pair, comprising, from top to bottom, an upper seat plate 1, a middle seat plate assembly 2, and a lower seat plate 3 stacked together, the middle seat plate assembly 2 being a top-to-bottom split structure, consisting of an upper middle seat plate 21 and a lower middle seat plate 22, a first friction pair 11 matching between the upper surface of the upper middle seat plate 21 and the lower surface of the upper seat plate 1, a second friction pair 12 matching between the lower surface of the lower middle seat plate 22 and the upper surface of the lower seat plate 3, the upper middle seat plate 21 and the lower middle seat plate 22 being connected to form a whole without relative movement in the horizontal direction by a mechanical connecting mechanism, and a detachable connecting mechanism being provided between the outer side of the upper middle seat plate 21 and the upper seat plate 1. When the connecting mechanism connects the upper middle seat plate 21 and the upper seat plate 1, the mechanical connecting mechanism is disassembled, and the upper middle seat plate 21 is lifted together by lifting the upper seat plate 1. After the upper middle seat plate 21 and the lower middle seat plate 22 are connected together by the mechanical connecting mechanism, the connecting mechanism is disassembled to realize the normal operation of the support.

[0029] The first friction pair 11 and / or the second friction pair 12 are curved surface friction pairs. A suitable friction pair is selected according to the required bearing effect. The curved surface friction pair includes a cylindrical friction pair and a spherical friction pair. The spherical friction pair provides a rotation function, and the cylindrical friction pair provides a unidirectional sliding function.

[0030] The mechanical connection mechanism is matched such as Figure 1 The boss groove mechanism, such as Figure 5 Keyway connection mechanism, such as Fig.13 It is composed of one or more combinations of bolt connection mechanisms or dovetail mortise and tenon mechanisms.

[0031] The clearance between the components in the mechanical connection machine is no more than 2 mm, which satisfies the clearance fit and can limit the support to prevent horizontal movement, but does not affect the separation between the upper seat plate 21 and the lower middle seat plate 22.

[0032] The boss and groove in the boss-groove mechanism are conically matched, with a matching angle of 0-30°, which can not only provide horizontal limit but also facilitate the assembly of the support.

[0033] The connection mechanism between the upper seat plate 1 and the upper middle seat plate 21 is a fixed connection, and preferably a special-shaped plate is used for connection; the special-shaped plate is preferably an "L"-shaped plate.

[0034] The friction pair replacement method is as follows: when replacing the friction pair, first release the fixed connection between the upper middle seat plate 21 and the lower middle seat plate 22 of the middle seat plate combination to separate the upper and lower parts, and then fix the upper seat plate 1 and the upper middle seat plate 21 together; use auxiliary equipment to lift the beam body, and lift the upper seat plate and the upper middle seat plate together by lifting the beam body. When the lifting height meets the height for replacing the friction pair, the friction pair can be replaced. If the friction pair is replaced on the upper middle seat plate, a mobile tooling is placed in the gap between the upper middle seat plate and the lower middle seat plate, and the upper middle seat plate is placed on the mobile tooling at the same time, the connection mechanism is released, and the upper middle seat plate is moved to the outside of the support body by the mobile tooling, and the friction pair replacement is completed outside the support; if the friction pair is replaced on the lower middle seat plate, the lower middle seat plate is directly moved to the outside of the support body, and the friction pair replacement is completed outside. If you replace the friction pair of the upper middle seat plate, you need to push the upper middle seat plate into the support body and connect the upper middle seat plate to the upper seat plate at the same time; if you replace the friction pair of the lower middle seat plate, directly push the lower middle seat plate into the support body, and then start to drop the beam. During the beam dropping process, pay attention to the matching condition of the upper and lower parts of the support middle seat plate. After the beam body is completely dropped, fix the support middle seat plate combination to complete the replacement of the friction pair.

[0035] Example 1

[0036] like Figure 1 , Figure 2The present invention is a schematic diagram of the structure of a replaceable cylindrical seismic isolation bearing with a friction pair for a long-span bridge, wherein the bearing is composed of an upper seat plate 1, a middle seat plate assembly 2, a lower seat plate 3 and a limit device 4; the middle seat plate assembly 2 is assembled by an upper middle seat plate 21 and a lower middle seat plate 22, a filling channel 23 is processed inside the lower middle seat plate 22, and a connecting threaded hole is reserved on the upper seat plate 1 for connecting the friction pair when replacing it.

[0037] The upper seat plate 1 is inlaid with a non-metallic slide plate, the upper surface of the upper middle seat plate 21 is a spherical surface, and the spherical surface is covered with a stainless steel slide plate, the lower surface of the lower middle seat plate 22 is inlaid with a non-metallic slide plate, and the stainless steel slide plate is welded on the upper surface of the lower seat plate 3; the non-metallic slide plate on the upper seat plate 1 and the stainless steel slide plate on the upper middle seat plate 21 constitute a first friction pair 11, and the non-metallic slide plate on the lower middle seat plate 22 and the stainless steel slide plate on the lower seat plate 3 constitute a second friction pair 12; the first friction pair 11 is used for support rotation, and the second friction pair 12 is used for support sliding.

[0038] like Figure 3 As shown, the middle seat plate assembly is formed by the upper middle seat plate 21 and the lower middle seat plate 22 through the boss and the groove, wherein the lower surface of the upper middle seat plate 21 is processed with a boss, and the boss is a cylindrical structure; the upper surface of the lower middle seat plate 22 is processed with a circular groove, and the height direction matching clearance of the boss and the groove is 0.5mm; the circumferential matching clearance of the boss and the groove is 2mm.

[0039] The upper middle seat plate 21 and the lower middle seat plate 22 are provided with key grooves along the sliding direction, and threaded holes are processed at the bottom of the grooves, wherein the threaded hole of the lower middle seat plate coincides with the filling channel.

[0040] The upper middle seat plate 21 and the lower middle seat plate 22 are fixedly connected as one body by connecting key block 24 and connecting bolt B 25, so as to ensure that the upper and lower parts of the middle seat plate assembly do not slide or rotate relative to each other during the sliding process.

[0041] When the sliding distance of the second friction pair is longer, the friction coefficient of the bearing increases, and when it is necessary to add silicone grease to the friction pair, the method of adding grease is: first, remove the plug 26 at the end of the filling channel 23, and connect the pipeline of the grease adding equipment to the threaded connection at the end of the filling channel 23. The new grease enters the friction pair surface through the filling channel 23 and the flow channel on the surface of the non-metallic slide plate, thereby realizing the grease replenishment of the bearing friction pair and further improving the lubrication and friction reduction function of the friction pair; as the operation time of the bearing is further extended, the wear of the non-metallic slide plate in the friction pair increases. When the exposed height of the non-metallic slide plate is less than the critical value, the friction pair must be replaced. By replacing the bearing sliding friction pair, the sliding distance of the bearing is further improved.

[0042] Friction pair replacement method:

[0043] When the friction pair needs to be replaced, the friction pair replacement process begins. Preparatory work such as scaffolding and beam lifting should be completed in advance.

[0044] like Figure 4 As shown, the connecting bolts B 25 and the connecting key block 24 connecting the upper middle seat plate 21 and the lower middle seat plate 22 are first removed, and the upper middle seat plate 21 and the upper seat plate 1 are fixed by the connecting bolts A6 using the pre-made "L"-shaped connecting plate 5.

[0045] Lift the beam body slowly by 1 mm. If the upper middle seat plate 21 and the lower middle seat plate 22 of the middle seat plate assembly 2 can be separated smoothly, continue to lift the beam body. If they cannot be separated, vibrate the middle seat plate to force the upper middle seat plate 21 and the lower middle seat plate 22 of the middle seat plate assembly 2 to separate; then continue to lift the beam body until the upper middle seat plate 21 and the lower middle seat plate 22 of the middle seat plate assembly 2 are completely separated.

[0046] Pull out the lower middle seat plate 22 of the middle seat plate assembly 2 of the support from the support along the sliding direction of the support, complete the replacement of the support friction pair outside the support, and then push the lower middle seat plate 22 of the support with the replaced friction pair into the support, align the upper middle seat plate 21 and the lower middle seat plate 22, slowly drop the beam, pay attention to the matching of the boss of the upper middle seat plate 21 and the groove of the lower middle seat plate 22 and adjust at any time; after the boss and the groove are fully matched, drop the beam completely. Remove the L-shaped connecting plate 5 and the connecting bolt A 6 connecting the upper seat plate 1 of the support and the upper middle seat plate 21, and use the connecting bolt B 25 and the connecting key block 24 to reconnect and fix the upper middle seat plate 21 and the lower middle seat plate 22, so as to complete the replacement of the second friction pair of the support.

[0047] Example 2

[0048] like Figure 5 , Figure 6 The present invention is a schematic diagram of a friction pair replaceable inverted ball bearing structure for a long-span bridge, wherein the bearing is composed of an upper seat plate 1, a middle seat plate assembly 2, and a lower seat plate 3; the middle seat plate assembly 2 is assembled from an upper middle seat plate 21 and a lower middle seat plate 22, and a threaded hole for connecting the friction pair when replacing the friction pair is reserved on the upper seat plate;

[0049] like Figure 6 As shown, the upper seat plate 1 is inlaid with a non-metallic slide plate, the spherical surface of the upper middle seat plate 21 is covered with a stainless slide plate, the lower surface of the lower middle seat plate 22 is inlaid with a non-metallic slide plate, and a stainless steel slide plate is welded on the lower seat plate 3; wherein the non-metallic slide plate on the upper seat plate 1 and the stainless steel slide plate on the upper middle seat plate 21 constitute a first friction pair 11, and the non-metallic slide plate on the lower middle seat plate 22 and the stainless steel slide plate on the lower seat plate 3 constitute a second friction pair 12; wherein the first friction pair 11 is used for support rotation, and the second friction pair 12 is used for support sliding.

[0050] The upper middle seat plate 21 and the lower middle seat plate 22 are in plane contact, and the contact surfaces of the upper middle seat plate 21 and the lower middle seat plate 22 are respectively processed with I-shaped grooves and key grooves for connection and shear resistance, such as Figure 7 As shown; wherein the I-shaped groove is processed along the sliding direction of the support, and the key groove is processed in the direction perpendicular to the sliding direction of the support; when assembling the support, align the I-shaped groove 14 and the key groove 13 of the upper portion 21 of the upper seat plate and the lower middle seat plate 22, and install the key groove as shown in FIG. Figure 8 The middle seat plate shear key 7 shown is installed in the I-shaped groove as shown in FIG. Fig. 9 The I-shaped connecting key 8 of the middle seat plate is shown; the installation clearance between the I-shaped connecting key 8 of the middle seat plate and the middle seat plate shear key 7 and the corresponding groove is 1mm.

[0051] like Fig.10 As shown, after the middle seat plate is assembled, the I-shaped connecting key 8 of the middle seat plate can ensure that the upper middle seat plate 21 and the lower middle seat plate 22 of the support are connected as a whole. At the same time, the I-shaped connecting key 8 of the middle seat plate and the middle seat plate shear key 7 can ensure that the upper and lower parts of the middle seat plate do not slide or rotate relative to each other during the sliding and rotation process of the middle seat plate.

[0052] A filling channel 23 is provided in the sliding direction of the lower middle seat plate 22 , and a plugging thread is processed at the end of the filling channel 23 , and a plug 26 is used for plugging.

[0053] During normal operation, the middle seat plate assembly 2 relies on the middle seat plate shear key 7 and the middle seat plate I-shaped connecting key 8 to form a whole. When the support has been running for a long time and the lubrication performance of the grease on the surface of the second friction pair is insufficient, it is necessary to add silicone grease to the friction pair. At this time, the plug 26 must be removed first, and then the high-pressure injection equipment pipeline is connected to the filling channel 23. Grease or lubricating oil is added to the surface of the non-metallic slide plate in the second friction pair through the high-pressure injection channel 23, thereby further improving the lubrication and friction reduction performance of the friction pair and extending the service life of the slide plate. When the exposed height of the slide plate is worn to the minimum value, the sliding friction pair needs to be replaced.

[0054] Friction pair replacement method:

[0055] When the friction pair needs to be replaced, the friction pair replacement process begins. First, complete the preparatory work such as scaffolding and beam lifting.

[0056] like Fig.11As shown, the upper middle seat plate 21 and the upper seat plate 1 are fixedly connected along the sliding direction of the support by using the connecting plate 5 and the connecting bolts A 6; the middle seat plate I-shaped connecting key 8 connecting the upper middle seat plate 21 and the lower middle seat plate 22 is taken out from the I-shaped groove, and the beam body is slowly lifted up, and the lifting height is higher than the exposed height of the middle seat plate shear key 7 in the lower middle seat plate 22, and then the lower middle seat plate 22 of the support middle seat plate assembly 2 is pulled out from the support along the sliding direction of the support, and the support friction pair is replaced outside the support, and then the support lower middle seat plate 22 with the replaced friction pair is pushed into the support and aligned with the upper middle seat plate 21 and the lower middle seat plate 22. The grooves of the seat plate 21 and the lower middle seat plate 22 are slowly lowered, and attention is paid to the cooperation between the middle seat plate shear key 7 on the lower middle seat plate 22 and the key groove on the surface of the upper middle seat plate 21. After the upper middle seat plate 21 and the lower middle seat plate 22 are fully matched, the I-shaped connecting key 8 of the middle seat plate is installed into the I-shaped groove of the middle seat plate combination to reconnect the upper middle seat plate 21 and the lower middle seat plate 22 of the middle seat plate combination into a whole; then the beam is lowered to the lowest position, and the special-shaped connecting plate 5 and the connecting bolts used for replacing the friction pair are removed at the same time, and the replacement of the bearing friction pair is completed.

[0057] Example 3

[0058] like Fig.12 , Fig.13 The present invention is a schematic diagram of a replaceable spherical bearing structure of a friction pair for a long-span bridge, wherein the bearing is composed of an upper seat plate 1, a middle seat plate assembly 2, and a lower seat plate 3; the middle seat plate assembly 2 is assembled by an upper middle seat plate 21 and a lower middle seat plate 22, and a connecting threaded hole is reserved on the upper seat plate for connecting the friction pair when replacing it.

[0059] like Fig.13 As shown, a stainless steel slide plate is welded on the upper seat plate 1, a non-metal slide plate is inlaid on the upper surface of the upper middle seat plate, a stainless steel slide plate is welded on the lower surface of the lower middle seat plate 22, and a non-metal slide plate is inlaid on the spherical surface of the lower seat plate 3; wherein the metal slide plate of the upper seat plate 1 and the non-metal slide plate of the upper middle seat plate 21 constitute a first friction pair, and the metal slide plate of the lower middle seat plate 22 and the non-metal slide plate of the lower seat plate 3 constitute a second friction pair; wherein the first friction pair is used for the bearing to slide, and the second friction pair is used for the bearing to rotate.

[0060] The upper middle seat plate 21 and the lower middle seat plate 22 are in plane contact, and keyways for shear resistance are respectively processed on the contact surfaces of the upper middle seat plate 21 and the lower middle seat plate 22. The keyway structure is as follows: Fig.14 As shown; when the middle seat plate is assembled, the middle seat plate shear key 7 is placed in the keyway of the contact surface, and the middle seat plate shear key structure is as shown Figure 8 As shown, the installation gap between the middle seat plate shear key and the corresponding groove is no more than 1 mm; the middle seat plate shear key 7 can ensure that the upper and lower parts of the middle seat plate do not slide or rotate relative to each other during the sliding and rotating process of the middle seat plate.

[0061] like Fig.15 As shown, a filling channel 23 is processed in the upper middle seat plate 21, a plugging thread is processed at the end of the filling channel 23, and a plug 26 is used to plug the filling channel; at the same time, a groove is processed at the edge of the upper middle seat plate 21, and a threaded hole is processed at the edge of the lower middle seat plate 22. When the middle seat plates are assembled, the upper middle seat plate 21 and the lower middle seat plate 22 are fixed into a whole by a connecting key block 24 and a connecting bolt B 25; wherein the connecting key block 24 is an L-shaped connecting plate, and the short side of the connecting plate is placed in the groove at the edge of the upper middle seat plate 21.

[0062] During normal operation, the upper and lower parts of the middle seat plate of the support function as a whole. As the use time of the support increases, when the friction reduction effect of the non-metallic slide plate in the sliding friction pair decreases, it is necessary to add grease to the surface of the non-metallic slide plate, remove the L-shaped connecting key block 24 and the connecting bolt B 25, and remove the plug 26 at the same time, connect the grease filling equipment pipeline with the filling channel 23, and the filling equipment fills the grease to the surface of the non-metallic slide plate through the filling channel 23 to improve the friction reduction effect and service life of the sliding friction pair. As the use time of the support further increases, when the exposed height of the non-metallic slide plate is less than the minimum value, the friction pair needs to be replaced.

[0063] Friction pair replacement method:

[0064] When the friction pair needs to be replaced, the friction pair replacement process begins. Complete the preparatory work such as scaffolding and beam lifting.

[0065] like Fig.16As shown, the connecting bolts B25 and the L-shaped connecting key block 24 connecting the upper middle seat plate 21 and the lower middle seat plate 22 are removed along the sliding direction of the support, so that the upper middle seat plate 21 and the lower middle seat plate 22 are separated, and then the upper middle seat plate 21 and the upper seat plate 1 are fixedly connected using the special-shaped connecting plate 5 and the connecting bolts A6. Lift the beam body to a height higher than the exposed height of the middle seat plate shear key 7 in the lower middle seat plate 22, then put a slidable load-bearing tooling into the gap between the upper middle seat plate and the middle seat plate shear key 7, adjust the height of the tooling so that the tooling contacts the bottom surface of the upper middle seat plate 21, then remove the connecting bolt A 6 to separate the upper middle seat plate 21 from the upper seat plate 1, and at the same time, the upper middle seat plate 21 falls onto the load-bearing tooling, then move the load-bearing tooling together with the upper middle seat plate 21 to the outside of the support, complete the replacement of the non-metallic slide plate on the upper middle seat plate 21 outside the support, then re-send the replacement tooling together with the upper middle seat plate into the support body, adjust the height of the load-bearing tooling so that the surface of the non-metal slide plate 11 in the upper middle seat plate 21 fits with the stainless steel slide plate on the upper seat plate 1, and then reuse the connecting plate 5 and the connecting bolt A 6 Connect the upper middle seat plate 21 and the upper seat plate 1 into a whole, remove the load-bearing tooling, slowly drop the beam, pay attention to the matching of the middle seat plate shear key 7 on the lower middle seat plate 22 and the keyway on the surface of the upper middle seat plate 21, and after the upper middle seat plate 21 and the lower middle seat plate 22 are fully matched, completely drop the beam body, remove the connecting plate 5 and the connecting bolt A 6 at the same time, reconnect the connecting key block 24 and the connecting bolt B 25, and form the upper middle seat plate 21 and the lower middle seat plate 22 into a whole, completing the replacement of the bearing friction pair.

Claims

1. A bridge bearing with replaceable friction pairs, comprising, from top to bottom, an upper seat plate (1), a middle seat plate assembly (2), and a lower seat plate (3) stacked together, characterized in that: The middle seat plate assembly (2) is a structure with upper and lower parts, and is composed of an upper middle seat plate (21) and a lower middle seat plate (22). A first friction pair (11) is provided between the upper surface of the upper middle seat plate (21) and the lower surface of the upper seat plate (1). A second friction pair (12) is provided between the lower surface of the lower middle seat plate (22) and the upper surface of the lower seat plate (3). The upper middle seat plate (21) and the lower middle seat plate (22) are connected as a whole by a mechanical connection mechanism. A detachable connection mechanism is provided between the outer side of the upper middle seat plate (21) and the upper seat plate (1).

2. A bridge bearing with replaceable friction pair as claimed in claim 1, characterized in that: The first friction pair (11) and / or the second friction pair (12) are curved surface friction pairs.

3. A bridge bearing with replaceable friction pair as claimed in claim 1, characterized in that: The mechanical connection mechanism is a combination of one or more matching boss groove mechanisms, keyway connection mechanisms, bolt connection mechanisms or dovetail mortise and tenon mechanisms.

4. A bridge bearing with replaceable friction pair as claimed in claim 3, characterized in that: The clearance between the components in the mechanical connection machine shall not exceed 2mm.

5. A bridge bearing with replaceable friction pair as claimed in claim 3, characterized in that: The boss and the groove in the boss-groove mechanism are conically matched, and the matching angle is 0-30°.

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