A jacking sliding friction pair for a suspension bridge and its installation process

Abstract

The present invention discloses a jacking sliding friction pair for a suspension bridge and its installation process. Among them, the jacking sliding friction pair includes a jacking slide plate and an antifriction slide plate that are slidably matched on the top and bottom sides. The antifriction slide plate is mainly composed of a substrate layer and a polytetrafluoroethylene coating compounded on the substrate layer. The substrate layer and the polytetrafluoroethylene coating of the antifriction slide plate are compounded into an integral structure. The polytetrafluoroethylene coating on the antifriction slide plate serves as the sliding friction working surface of the antifriction slide plate for mating with the jacking slide plate. The present invention can stably bear huge loads and jacking forces of thousands of tons or even greater. During the jacking installation construction operation of the main cable saddle of a suspension bridge, it can be reliably stressed and is not easily damaged, effectively meeting the technical requirements of jacking installation construction operations with jacking forces above thousands of tons.

Description

Technical Field

[0001] The present invention relates to a jacking sliding friction structure for jacking construction operations, specifically a jacking sliding friction pair for a suspension bridge, and an installation process for the jacking sliding friction pair, which is particularly suitable for the jacking installation construction operation of the main cable saddle of a suspension bridge. Background Art

[0002] During the construction process of a suspension bridge project, in order to ensure that the main tower can always be in a safe stress state during the hoisting of the stiffening girder, it is necessary to pre-deviate the main cable saddle that supports the main cable at the top of the main tower in the initial stage, so that it can be gradually jacked to the designed position as the bridge construction project progresses, so as to achieve the balance of the forces on the main cables on both sides of the main tower. It can be seen that the jacking sliding friction pair structure used in the installation construction operation of the main cable saddle of a suspension bridge directly determines the stability and reliability of the jacking installation construction operation of the main cable saddle.

[0003] The existing jacking sliding friction pair for the jacking of the main cable saddle of a suspension bridge is mainly composed of a stainless steel plate fixed to the bottom surface of the upper bearing plate at the bottom of the main cable saddle body and a polytetrafluoroethylene plate fixed to the top surface of the lower bearing plate at the top of the main cable saddle grid. The polytetrafluoroethylene plate is fixed to the top surface of the lower bearing plate by hot pressing and pasting. The bottom surface of the stainless steel plate and the top surface of the polytetrafluoroethylene plate form a sliding fit relationship on the top and bottom sides. Although this jacking sliding friction pair is composed of a polytetrafluoroethylene plate with a very low friction coefficient, however, in the jacking installation construction operation of the main cable saddle, technical problems such as damage to the polytetrafluoroethylene plate often occur. This is because:

[0004] The polytetrafluoroethylene plate fixed to the lower bearing plate by hot pressing and pasting has a relatively large thickness structure and will bear the combined heavy pressure of the weight of the saddle body and the weights of the main cable and steel beam transmitted through the saddle body during the jacking installation construction operation. Thus, under the action of a jacking force of thousands of tons or even greater, the polytetrafluoroethylene plate on the lower bearing plate is prone to compressive damage and / or shaving damage caused by compressive deformation. This is particularly common for shaving damage caused by compressive deformation. Specifically, refer to Figure 1 as shown in the figure, where A is the polytetrafluoroethylene plate, B is the stainless steel plate, and Δt is the deformation height of the compression surface.

[0005] Therefore, based on the structural characteristics of the stainless steel-polytetrafluoroethylene plate sliding friction pair used in the existing jacking installation construction operation of the main cable saddle of a suspension bridge, it is difficult to meet the technical requirements of the installation construction operation with a jacking force of more than thousands of tons. Although the industry has tried to take measures such as Figure 2The technical measure of chamfering the lower edge part of the front end of the stainless steel plate as shown in the figure (where A is a polytetrafluoroethylene plate, B is a stainless steel plate, and Δt is the deformation height of the pressure-receiving surface) has little effect. The polytetrafluoroethylene plate is still prone to pressure damage and / or shaving damage caused by pressure deformation, and it is difficult to meet the technical requirements of the pushing operation with a pushing force of more than a thousand tons. Summary of the Invention

[0006] The technical object of the present invention is to: aiming at the particularity of the pushing operation of the suspension bridge and the technical deficiencies of the existing pushing sliding friction pair, provide a pushing sliding friction pair that not only has an extremely low friction coefficient but also has excellent mechanical properties, can stably bear huge loads (these loads mainly come from the main saddle body, main cable, steel beam, etc.) and a pushing force of thousands of tons or even greater, as well as the installation process of the pushing sliding friction pair.

[0007] The technical object of the present invention is achieved by the following technical solution: a pushing sliding friction pair for a suspension bridge, the pushing sliding friction pair includes a pushing slide plate and a friction-reducing slide plate that are slidably matched on the top and bottom sides. The friction-reducing slide plate is mainly composed of a substrate layer and a polytetrafluoroethylene coating compounded on the substrate layer. The substrate layer and the polytetrafluoroethylene coating of the friction-reducing slide plate are compounded into an integral structure, and the polytetrafluoroethylene coating on the friction-reducing slide plate serves as the sliding friction working surface of the friction-reducing slide plate for cooperating with the pushing slide plate.

[0008] As one of the preferred solutions, there is a bonding layer between the substrate layer and the polytetrafluoroethylene coating of the friction-reducing slide plate, and the substrate layer and the polytetrafluoroethylene coating are compounded into an integral structure by the bonding layer.

[0009] As one of the preferred solutions, the substrate layer of the friction-reducing slide plate is a copper plate structure or a common carbon steel plate structure with a thickness of 1 - 5 mm.

[0010] As one of the preferred solutions, the thickness of the polytetrafluoroethylene coating of the friction-reducing slide plate ≤ 1 mm.

[0011] As one of the preferred solutions, the pushing slide plate is of a stainless steel plate structure, a hard chromium composite plate structure or a polytetrafluoroethylene composite plate structure. Further, the pushing slide plate of the hard chromium composite plate structure is mainly composed of a steel plate substrate and a coated hard chromium layer, and the hard chromium coated layer of the hard chromium composite plate structure serves as the sliding friction working surface for cooperating with the antifriction slide plate. The pushing slide plate of the polytetrafluoroethylene composite plate structure is mainly composed of a substrate layer and a polytetrafluoroethylene coating layer, and the polytetrafluoroethylene coating layer of the polytetrafluoroethylene composite plate structure serves as the sliding friction working surface for cooperating with the antifriction slide plate. Still further, there is a bonding layer between the substrate layer and the polytetrafluoroethylene coating layer of the pushing slide plate of the polytetrafluoroethylene composite plate structure, and the substrate layer and the polytetrafluoroethylene coating layer are combined into an integral structure by the bonding layer. The substrate layer of the pushing slide plate of the polytetrafluoroethylene composite plate structure is of a copper plate structure or a common carbon steel plate structure with a thickness of 1 - 5 mm. The thickness of the polytetrafluoroethylene coating layer of the pushing slide plate of the polytetrafluoroethylene composite plate structure is ≤ 1 mm.

[0012] An installation process for a pushing sliding friction pair with the above-mentioned stainless steel plate structure as the pushing slide plate, the installation process includes the following technical measures:

[0013] - The pushing slide plate of the stainless steel plate structure is directly fixed to the bottom surface of the saddle; or, the pushing slide plate of the stainless steel plate structure is fixed to the bottom surface of the upper bearing plate at the bottom of the saddle by plug welding.

[0014] - The antifriction slide plate is fixed to the top surface of the lower bearing plate on the grille by countersunk head screws. The top surface of the installed countersunk head screws is 0.2 - 0.7 mm lower than the top surface of the antifriction slide plate, and the overall flatness of the top surface of the antifriction slide plate on the lower bearing plate is ≤ 0.5 mm.

[0015] As one of the preferred solutions, multiple antifriction slide plates are installed on the lower bearing plate. Each antifriction slide plate is of a polygonal structure. These antifriction slide plates are closely arranged on the top surface of the lower bearing plate, and the length directions of the antifriction slide plates correspond to the pushing direction. The arrangement gap between adjacent antifriction slide plates is 40 - 60 mm, and the arrangement gap serves as a lubricating oil groove.

[0016] An installation process for a pushing sliding friction pair with the above-mentioned hard chromium composite plate structure as the pushing slide plate, the installation process includes the following technical measures:

[0017] - For the pushing slide plate of the hard chromium composite plate structure, the upper bearing plate at the bottom of the saddle is used as the steel plate substrate, a hard chromium layer is coated on the bottom surface of the upper bearing plate, and the hard chromium coated layer on the bottom surface of the upper bearing plate is formed after polishing treatment.

[0018] - The antifriction slide plate is fixed to the top surface of the lower bearing plate on the grid by countersunk head screws. The top surface of the countersunk head screws installed in place is 0.2 - 0.7 mm lower than the top surface of the antifriction slide plate, and the overall flatness of the top surface of the antifriction slide plate on the lower bearing plate ≤ 0.5 mm.

[0019] As one of the preferred solutions, multiple antifriction slide plates are installed on the lower bearing plate. Each antifriction slide plate is of a polygonal structure. These antifriction slide plates are closely arranged on the top surface of the lower bearing plate, and the length direction of each antifriction slide plate corresponds to the jacking direction. The arrangement gap between adjacent antifriction slide plates is 40 - 60 mm, and the arrangement gap is used as a lubricating oil groove.

[0020] An installation process for the jacking sliding friction pair with the polytetrafluoroethylene composite plate structure as the jacking slide plate described above. The installation process includes the following technical measures:

[0021] - The jacking slide plate with the polytetrafluoroethylene composite plate structure is fixed to the bottom surface of the upper bearing plate at the bottom of the saddle body by countersunk head screws. The bottom surface of the countersunk head screws installed in place is 0.2 - 0.7 mm higher than the bottom surface of the jacking slide plate, and the overall flatness of the bottom surface of the jacking slide plate ≤ 0.5 mm;

[0022] - The antifriction slide plate is fixed to the top surface of the lower bearing plate on the grid by countersunk head screws. The top surface of the countersunk head screws installed in place is 0.2 - 0.7 mm lower than the top surface of the antifriction slide plate, and the overall flatness of the top surface of the antifriction slide plate on the lower bearing plate ≤ 0.5 mm.

[0023] As one of the preferred solutions, multiple antifriction slide plates are installed on the lower bearing plate. Each antifriction slide plate is of a polygonal structure. These antifriction slide plates are closely arranged on the top surface of the lower bearing plate, and the length direction of each antifriction slide plate corresponds to the jacking direction. The arrangement gap between adjacent antifriction slide plates is 40 - 60 mm, and the arrangement gap is used as a lubricating oil groove.

[0024] The beneficial technical effects of the present invention are:

[0025] 1. The jacking sliding friction pair of the present invention is formed by the cooperation of the jacking slide plate and the new antifriction slide plate. The antifriction slide plate is compounded with a polytetrafluoroethylene coating integrated with it on the basis of the substrate layer, so that the polytetrafluoroethylene structure on the antifriction slide plate is fine and dense, and will not form a large thickness structure. However, its friction working surface can maintain a friction coefficient equivalent to that of the polytetrafluoroethylene plate, and at the same time has mechanical properties that the polytetrafluoroethylene plate cannot match. Its mechanical strength is excellent, and it can stably withstand huge loads (these loads mainly come from the main cable saddle body, main cable and steel beam, etc.) and a jacking force of thousands of tons or even greater. It can be reliably stressed and is not easily damaged during the jacking installation construction operation of the main cable saddle of the suspension bridge, effectively meeting the technical requirements of the jacking installation construction operation with a jacking force of more than thousands of tons;

[0026] 2. The composite structure of the bonding layer between the substrate layer and the polytetrafluoroethylene coating of the antifriction slide plate of the present invention ensures that the polytetrafluoroethylene coating can be stably, densely and reliably compounded on the substrate layer, with stable chemical properties and physical structure, thereby ensuring that the antifriction slide plate has excellent mechanical strength and mechanical properties;

[0027] 3. The antifriction slide plate of the present invention selects a copper plate structure with a thickness of 1-5 mm as the substrate layer, which can eliminate the need for anti-corrosion treatment, has excellent corrosion resistance and does not rust, and is suitable for harsh outdoor service conditions; the antifriction slide plate of the present invention can also select a common carbon steel plate structure with a thickness of 1-5 mm that has been anti-corrosion treated as the substrate layer, which is beneficial for forming and controlling costs;

[0028] 4. The polytetrafluoroethylene coating on the antifriction slide plate of the present invention is formed with a thickness of ≤1 mm, effectively controlling its thickness on the substrate layer, which is beneficial for ensuring that the antifriction slide plate can stably withstand huge loads and thrusts of thousands of tons or even greater;

[0029] 5. The jacking slide plate of the present invention is formed with a hard chromium composite plate structure. When its friction coefficient reaches 0.05 in cooperation with the antifriction slide plate (under general lubrication conditions; this friction coefficient is also the friction coefficient of the jacking slide plate with a stainless steel plate structure in cooperation with the antifriction slide plate), the forming cost can be effectively controlled compared with the jacking slide plate with a stainless steel plate structure; the jacking slide plate of the present invention is formed with a polytetrafluoroethylene composite plate structure (i.e., the antifriction slide plate structure), which has a lower friction coefficient in cooperation with the antifriction slide plate (under general lubrication conditions) and better jacking effect;

[0030] 6. The present invention uses a stainless steel plate as the installation process for the cooperation between the jacking slide plate and the antifriction slide plate, making the top surface of the antifriction slide plate flat and the friction coefficient unaffected, and enabling excellent jacking effect in the jacking installation construction operation; in addition, the multi-piece arrangement structure of the antifriction slide plate on the top surface of the lower bearing plate of the present invention is not only beneficial for ensuring flatness and reducing the installation technical difficulty, but also can effectively guide the jacking slide plate for directional jacking, and can also effectively store lubricating oil;

[0031] 7. The present invention uses a hard chromium composite plate as the installation process for the cooperation between the jacking slide plate and the antifriction slide plate, directly forming the jacking slide plate with the upper bearing plate at the bottom of the saddle body, which is economical, simple and practical; at the same time, making the top surface of the antifriction slide plate flat and the friction coefficient unaffected, and enabling excellent jacking effect in the jacking installation construction operation; in addition, the multi-piece arrangement structure of the antifriction slide plate on the top surface of the lower bearing plate of the present invention is not only beneficial for ensuring flatness and reducing the installation technical difficulty, but also can effectively guide the jacking slide plate for directional jacking, and can also effectively store lubricating oil;

[0032] 8. The installation process of the present invention using a polytetrafluoroethylene composite plate as the jacking slide plate in cooperation with the antifriction slide plate can ensure excellent jacking effects during jacking installation construction operations; in addition, the arrangement structure of multiple antifriction slide plates on the top surface of the lower bearing plate in the present invention is beneficial for ensuring flatness, reducing the installation technical difficulty, can effectively guide the jacking slide plate for directional jacking, and can also effectively achieve lubricating oil storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 FIG. 6 is a schematic diagram of a compression state structure of an existing jacking sliding friction pair (i.e., a jacking sliding friction pair composed of a stainless steel plate - polytetrafluoroethylene plate) for a suspension bridge. As can be seen from the figure, during jacking installation construction, the lower edge part at the front end of the jacking of the stainless steel plate is a right-angle structure, and the polytetrafluoroethylene plate is compressed and deformed, generating a compression surface deformation height at the front end of the jacking of the stainless steel plate, thereby causing shaving-type damage.

[0034] Figure 2 FIG. 10 is a schematic diagram of another compression state structure of an existing jacking sliding friction pair (i.e., a jacking sliding friction pair composed of a stainless steel plate - polytetrafluoroethylene plate) for a suspension bridge. As can be seen from the figure, during jacking installation construction, the lower edge part at the front end of the jacking of the stainless steel plate is a rounded corner structure, and the polytetrafluoroethylene plate is compressed and deformed, generating a compression surface deformation height at the front end of the jacking of the stainless steel plate, thereby causing shaving-type damage.

[0035] Figure 3 FIG. 14 is a schematic diagram of a structure of the jacking sliding friction pair of the present invention. As can be seen from the figure, the jacking slide plate arranged on the bottom surface of the lower bearing plate at the bottom of the saddle forms a sliding fit relationship on the top and bottom sides with the antifriction slide plate arranged on the top surface of the upper bearing plate at the top of the grid.

[0036] Figure 4 FIG. Figure 3 20 is a schematic diagram of a structure of the antifriction slide plate in FIG. 19. As can be seen from the figure, the antifriction slide plate is mainly composed of a substrate layer, a middle bonding layer, and an outer polytetrafluoroethylene coating compounded into an integral structure.

[0037] Figure 5 FIG. 24 is a schematic diagram of the installation structure of the antifriction slide plate of the present invention on the grid. As can be seen from the figure, multiple polygonal antifriction slide plates are densely arranged on the top surface of the lower bearing plate at the top of the grid. The length direction of each antifriction slide plate corresponds to the jacking direction. There is a mating gap between adjacent antifriction slide plates that can form a lubricating oil groove, and each antifriction slide plate is fixed to the top surface of the lower bearing plate by multiple countersunk head screws.

[0038] Figure 6 FIG. Figure 5 30 is a partial enlarged view of A - A in FIG. 29. As can be seen from the figure, the antifriction slide plate is fixed to the top surface of the lower bearing plate by countersunk head screws, and the top surface of the countersunk head screws is lower than the top surface of the antifriction slide plate.

[0039] Meanings of the codes in the figure: 1 - antifriction slide plate; 11 - substrate layer; 12 - polytetrafluoroethylene coating; 13 - bonding layer; 2 - saddle body; 3 - upper bearing plate; 4 - jacking slide plate; 5 - lower bearing plate; 6 - grille; 7 - countersunk screw; A - polytetrafluoroethylene plate; B - stainless steel plate; Δt - deformation height of the compressed surface. Specific implementation mode

[0040] The present invention relates to a jacking sliding friction structure for jacking construction operations, specifically a jacking sliding friction pair for a suspension bridge, and an installation process of the jacking sliding friction pair. The main technical content of the present invention will be described in detail below with multiple embodiments. Among them, Embodiment 1 is combined with the accompanying drawings of the specification - that is Figure 3 , Figure 4 , Figure 5 and Figure 6 to clearly and detailedly explain the technical solution content of the present invention. Although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of Embodiment 1.

[0041] It should be particularly noted here that the drawings of the present invention are schematic. In order to clarify the technical purpose of the present invention, unnecessary details have been simplified to avoid obscuring the technical solution contributed by the present invention to the prior art.

[0042] Embodiment 1

[0043] See Figure 3 and Figure 4 As shown, the present invention is a jacking sliding friction pair for the jacking installation construction operation of the main cable saddle of a suspension bridge, which includes a jacking slide plate 4 in the upper side position and an antifriction slide plate 1 in the lower side position. In the jacking installation construction operation of the main cable saddle, the jacking slide plate 4 and the antifriction slide plate 1 form a sliding fit relationship on the top and bottom sides.

[0044] Specifically, the jacking slide plate 4 is of a stainless steel plate structure.

[0045] The antifriction slide plate 1 is mainly composed of a substrate layer 11, a bonding layer 13 and a polytetrafluoroethylene coating 12. Among them, the substrate layer 11 is of a copper plate structure with a thickness of about 2 mm, which is used as the base body of the antifriction slide plate 1, and a surface of the substrate layer 11 is selected as the forming surface of the friction structure; the bonding layer 13 is of a bronze powder bonding layer structure, which is compounded and formed on the forming surface of the friction structure of the substrate layer 11 and serves as a transition structure between the substrate layer 11 and the polytetrafluoroethylene coating 12; the polytetrafluoroethylene coating 12 is compounded and formed on the surface of the bonding layer 13 on the substrate layer 11. The forming thickness of the polytetrafluoroethylene coating 12 on the surface of the bonding layer 13 should not exceed 0.1 mm, that is, this thickness ≤ 0.1 mm is acceptable, such as 0.1 mm, 0.08 mm, 0.07 mm or 0.05 mm. Of course, it is necessary to ensure that the polytetrafluoroethylene coating 12 is densely formed.

[0046] With the above-mentioned anti-friction slide plate structure, the final physical structure of the anti-friction slide plate 1 is composed of a substrate layer 11, a bonding layer 13 compounded and formed on one side surface of the substrate layer 11, and a polytetrafluoroethylene coating 12 compounded on the bonding layer 13. That is, there is a bonding layer 13 between the substrate layer 11 and the polytetrafluoroethylene coating 12 of the anti-friction slide plate 1, and the substrate layer 11 and the polytetrafluoroethylene coating 12 are compounded into an integral structure by the bonding layer 13. The polytetrafluoroethylene coating 12 on the anti-friction slide plate 1 serves as the sliding friction working surface of the anti-friction slide plate 1 to cooperate with the bottom surface of the pushing slide plate 4 of the above-mentioned stainless steel structure.

[0047] See Figure 5 and Figure 6 As shown, the installation process of the pushing sliding friction pair with the above structure includes the following technical measures:

[0048] - Fix a monolithic pushing slide plate 4 made of stainless steel plate structure to the bottom surface of the upper bearing plate 3 at the bottom of the saddle body 2 by plug welding;

[0049] - There are multiple anti-friction slide plates 1, and each anti-friction slide plate 1 is of a rectangular structure. These anti-friction slide plates 1 are arranged on the top surface of the lower bearing plate 5 on the grid 6 in a rectangular array corresponding to the area of the pushing slide plate 4. And in the arrangement structure of the rectangular array, the length direction of each anti-friction slide plate 1 corresponds to the pushing direction, and the arrangement gap between adjacent anti-friction slide plates 1 is about 50 mm to naturally form a lubricating oil groove; each of the aforementioned anti-friction slide plates 1 is fixed to the top surface of the lower bearing plate 5 on the grid 6 by multiple countersunk head screws 7. The top surface of the installed countersunk head screws 7 is about 0.5 mm lower than the top surface of the anti-friction slide plate 1, and the overall flatness of the top surface of the anti-friction slide plate 1 on the lower bearing plate 5 is about 0.5 mm.

[0050] Embodiment 2

[0051] The present invention is a pushing sliding friction pair for the pushing installation construction operation of the main cable saddle of a suspension bridge, which includes a pushing slide plate in the upper side position and an anti-friction slide plate in the lower side position. In the pushing installation construction operation of the main cable saddle, the pushing slide plate and the anti-friction slide plate form a sliding fit relationship on the top and bottom sides.

[0052] Specifically, the pushing slide plate is of stainless steel plate structure.

[0053] The anti-friction slide plate is mainly composed of a base plate layer, a bonding layer and a polytetrafluoroethylene coating. Among them, the base plate layer is a copper plate structure with a thickness of about 3 mm, which is used as the matrix of the anti-friction slide plate, and one surface of the base plate layer is selected as the forming surface of the friction structure; the bonding layer is a bronze powder bonding layer structure, which is formed by composite molding on the forming surface of the friction structure of the base plate layer and serves as a transition structure between the base plate layer and the polytetrafluoroethylene coating; the polytetrafluoroethylene coating is formed by composite molding on the surface of the bonding layer on the base plate layer. The forming thickness of the polytetrafluoroethylene coating on the surface of the bonding layer should not exceed 0.1 mm, that is, any thickness ≤ 0.1 mm is acceptable, such as 0.1 mm, 0.08 mm, 0.07 mm or 0.05 mm. Of course, it is necessary to ensure that the polytetrafluoroethylene coating is densely formed.

[0054] Through the above anti-friction slide plate structure, the final physical structure of the anti-friction slide plate is composed of the base plate layer, the bonding layer formed by composite molding on one side surface of the base plate layer, and the polytetrafluoroethylene coating formed by composite molding on the bonding layer. That is, there is a bonding layer between the base plate layer and the polytetrafluoroethylene coating of the anti-friction slide plate, and the base plate layer and the polytetrafluoroethylene coating are compounded into an integral structure by the bonding layer. The polytetrafluoroethylene coating on the anti-friction slide plate serves as the sliding friction working surface of the anti-friction slide plate to cooperate with the bottom surface of the above-mentioned stainless steel structure of the pushing slide plate.

[0055] The installation process of the pushing sliding friction pair with the above structure includes the following technical measures:

[0056] - Do not set an upper bearing plate at the bottom of the saddle body, and directly fix a whole stainless steel plate structure of the pushing slide plate on the bottom surface of the saddle body;

[0057] - There are multiple anti-friction slide plates, and each anti-friction slide plate is a polygonal structure. These anti-friction slide plates are densely arranged on the top surface of the lower bearing plate on the grid corresponding to the area of the pushing slide plate. And in the arrangement structure of the rectangular array, the length direction of each anti-friction slide plate corresponds to the pushing direction, and the arrangement gap between adjacent anti-friction slide plates is about 45 mm to naturally form a lubricating oil groove; each of the above-mentioned anti-friction slide plates is fixed on the top surface of the lower bearing plate on the grid by multiple countersunk head screws. The top surface of the installed countersunk head screws is about 0.4 mm lower than the top surface of the anti-friction slide plate, and the overall flatness of the top surface of the anti-friction slide plate on the lower bearing plate is about 0.5 mm.

[0058] Example 3

[0059] The present invention is a pushing sliding friction pair for the pushing installation construction operation of the main cable saddle of a suspension bridge, which includes a pushing slide plate in the upper position and an anti-friction slide plate in the lower position. In the pushing installation construction operation of the main cable saddle, the pushing slide plate and the anti-friction slide plate form a sliding fit relationship on the top and bottom sides.

[0060] Specifically, the push skateboard has a hard chromium composite plate structure. The push skateboard with the hard chromium composite plate structure is mainly composed of a steel plate matrix and a coated hard chromium layer, and the steel plate matrix and the coated hard chromium layer are integrally composite structures. The push skateboard with the hard chromium composite plate structure uses the hard chromium coating layer as the sliding friction working surface for cooperating with the friction-reducing skateboard.

[0061] The friction-reducing skateboard is mainly composed of a substrate layer, a bonding layer, and a polytetrafluoroethylene coating. Among them, the substrate layer is a common carbon steel plate structure with a thickness of about 5 mm, which is used as the matrix of the friction-reducing skateboard. One surface of the substrate layer is selected as the forming surface of the friction structure; the bonding layer is a bronze powder bonding layer structure, which is formed on the forming surface of the friction structure of the substrate layer as a transition structure between the substrate layer and the polytetrafluoroethylene coating; the polytetrafluoroethylene coating is formed on the surface of the bonding layer on the substrate layer, and the forming thickness of the polytetrafluoroethylene coating on the surface of the bonding layer should not exceed 0.1 mm, that is, the thickness ≤ 0.1 mm is acceptable, such as 0.1 mm, 0.08 mm, 0.07 mm, or 0.05 mm. Of course, it is necessary to ensure that the polytetrafluoroethylene coating is densely formed.

[0062] Through the above friction-reducing skateboard structure, the final physical structure of the friction-reducing skateboard is composed of the substrate layer, the bonding layer formed on one side surface of the substrate layer, and the polytetrafluoroethylene coating formed on the bonding layer. That is, there is a bonding layer between the substrate layer and the polytetrafluoroethylene coating of the friction-reducing skateboard, and the substrate layer and the polytetrafluoroethylene coating are compounded into an integral structure by the bonding layer. The polytetrafluoroethylene coating on the friction-reducing skateboard is used as the sliding friction working surface of the friction-reducing skateboard to cooperate with the bottom surface of the push skateboard with the above hard chromium composite plate structure.

[0063] The installation process of the push sliding friction pair with the above structure includes the following technical measures:

[0064] - The push skateboard with the hard chromium composite plate structure is a monolithic structure. The push skateboard of this structure is directly formed on the upper bearing plate at the bottom of the saddle. Specifically, the upper bearing plate at the bottom of the saddle is used as the steel plate matrix of the hard chromium composite plate, a hard chromium layer is coated on the bottom surface of the upper bearing plate, and the hard chromium coating on the bottom surface of the upper bearing plate is formed after polishing treatment;

[0065] - There are multiple friction-reducing skateboards. Each friction-reducing skateboard is a polygonal structure. These friction-reducing skateboards are densely arranged on the top surface of the lower bearing plate on the grid corresponding to the area of the push skateboard. And in the arrangement structure of the rectangular array, the length direction of each friction-reducing skateboard corresponds to the push direction, and the arrangement gap between adjacent friction-reducing skateboards is about 55 mm to naturally form a lubricating oil groove; each of the aforementioned friction-reducing skateboards is fixed on the top surface of the lower bearing plate on the grid by multiple countersunk screws. The top surface of the installed countersunk screws is about 0.6 mm lower than the top surface of the friction-reducing skateboard, and the overall flatness of the top surface of the friction-reducing skateboard on the lower bearing plate is about 0.5 mm.

[0066] Example 4

[0067] The present invention relates to a jacking sliding friction pair for the jacking installation construction operation of the main cable saddle of a suspension bridge, which includes a jacking slide plate in the upper position and an anti-friction slide plate in the lower position. In the jacking installation construction operation of the main cable saddle, the jacking slide plate and the anti-friction slide plate form a sliding fit relationship on the top and bottom sides.

[0068] Specifically, the jacking slide plate has a polytetrafluoroethylene composite plate structure. The jacking slide plate with the polytetrafluoroethylene composite plate structure is mainly composed of a substrate layer, a bonding layer, and a polytetrafluoroethylene coating. Among them, the substrate layer is a common carbon steel plate structure with a thickness of about 4 mm, which serves as the matrix of the composite plate, and one surface of the substrate layer is selected as the forming surface of the friction structure; the bonding layer is a bronze powder bonding layer structure, which is formed on the forming surface of the friction structure of the substrate layer as a transition structure between the substrate layer and the polytetrafluoroethylene coating; the polytetrafluoroethylene coating is formed on the surface of the bonding layer on the substrate layer, and the forming thickness of the polytetrafluoroethylene coating on the surface of the bonding layer should not exceed 0.1 mm, that is, any thickness ≤ 0.1 mm is acceptable, such as 0.1 mm, 0.08 mm, 0.07 mm, or 0.05 mm. Of course, it is necessary to ensure that the polytetrafluoroethylene coating is densely formed.

[0069] Through the above polytetrafluoroethylene composite plate structure, the final physical structure of the polytetrafluoroethylene composite plate is composed of the substrate layer, the bonding layer formed on one surface of the substrate layer, and the polytetrafluoroethylene coating formed on the bonding layer. That is, there is a bonding layer between the substrate layer and the polytetrafluoroethylene coating of the polytetrafluoroethylene composite plate, and the substrate layer and the polytetrafluoroethylene coating are combined into an integral structure by the bonding layer. The polytetrafluoroethylene coating on the polytetrafluoroethylene composite plate serves as the sliding friction working surface to cooperate with the top surface of the following anti-friction slide plate.

[0070] The anti-friction slide plate is mainly composed of a substrate layer, a bonding layer, and a polytetrafluoroethylene coating. Among them, the substrate layer is a common carbon steel plate structure with a thickness of about 4 mm, which serves as the matrix of the anti-friction slide plate, and one surface of the substrate layer is selected as the forming surface of the friction structure; the bonding layer is a bronze powder bonding layer structure, which is formed on the forming surface of the friction structure of the substrate layer as a transition structure between the substrate layer and the polytetrafluoroethylene coating; the polytetrafluoroethylene coating is formed on the surface of the bonding layer on the substrate layer, and the forming thickness of the polytetrafluoroethylene coating on the surface of the bonding layer should not exceed 0.1 mm, that is, any thickness ≤ 0.1 mm is acceptable, such as 0.1 mm, 0.08 mm, 0.07 mm, or 0.05 mm. Of course, it is necessary to ensure that the polytetrafluoroethylene coating is densely formed.

[0071] Through the above anti-friction slide plate structure, the final physical structure of the anti-friction slide plate is composed of a substrate layer, a bonding layer integrally formed on one surface of the substrate layer, and a polytetrafluoroethylene coating laminated on the bonding layer. That is, there is a bonding layer between the substrate layer and the polytetrafluoroethylene coating of the anti-friction slide plate, and the substrate layer and the polytetrafluoroethylene coating are laminated into an integral structure by the bonding layer. The polytetrafluoroethylene coating on the anti-friction slide plate serves as the sliding friction working surface of the anti-friction slide plate to cooperate with the bottom surface of the pushing slide plate of the above polytetrafluoroethylene composite plate structure.

[0072] The installation process of the pushing sliding friction pair with the above structure includes the following technical measures:

[0073] - The pushing slide plate of the polytetrafluoroethylene composite plate structure is an integral structure. The pushing slide plate is fixed to the bottom surface of the upper bearing plate at the bottom of the saddle body by countersunk head screws. The bottom surface of the installed countersunk head screws is about 0.5 mm higher than the bottom surface of the pushing slide plate (of course, it can be reasonably selected within the range of 0.2 - 0.7 mm), and the overall flatness of the bottom surface of the pushing slide plate is about 0.5 mm.

[0074] - There are multiple anti-friction slide plates, and each anti-friction slide plate is a polygonal structure. These anti-friction slide plates are densely arranged on the top surface of the lower bearing plate on the grid corresponding to the area of the pushing slide plate. In the arrangement structure of the rectangular array, the length direction of each anti-friction slide plate corresponds to the pushing direction, and the arrangement gap between adjacent anti-friction slide plates is about 40 mm to naturally form a lubricating oil groove; each of the above-mentioned anti-friction slide plates is fixed to the top surface of the lower bearing plate on the grid by multiple countersunk head screws. The top surface of the installed countersunk head screws is about 0.3 mm lower than the top surface of the anti-friction slide plate, and the overall flatness of the top surface of the anti-friction slide plates on the lower bearing plate is about 0.5 mm.

[0075] The above embodiments are only used to illustrate the present invention, not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: they can still modify the specific technical solutions in the above embodiments, or perform equivalent replacements for some of the technical features (for example, reasonably select a copper plate structure or a common carbon steel plate structure for the substrate layer of the anti-friction slide plate within the thickness range of 1 - 5 mm; or, reasonably select a copper plate structure or a common carbon steel plate structure for the substrate layer of the polytetrafluoroethylene composite plate within the thickness range of 1 - 5 mm; or, directly laminate the substrate layer of the anti-friction slide plate and the polytetrafluoroethylene coating together, cancel the bonding layer, and similarly, the forming structure of the polytetrafluoroethylene composite plate can also be like this; or, the anti-friction slide plate on the top surface of the lower bearing plate is an integral plate structure); and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the present invention.

Claims

1. A jacking sliding friction pair for a suspension bridge, comprising a jacking slide plate (4) arranged at the bottom of a saddle body and a friction-reducing slide plate (1) arranged at the top of a grid, wherein the jacking slide plate (4) and the friction-reducing slide plate (1) form a sliding fit on the top and bottom sides; It is characterized in that: The friction-reducing slide plate (1) is mainly composed of a substrate layer (11) and a polytetrafluoroethylene coating (12) compounded on the substrate layer (11). The substrate layer (11) and the polytetrafluoroethylene coating (12) of the friction-reducing slide plate (1) are compounded into an integral structure. The polytetrafluoroethylene coating (12) on the friction-reducing slide plate (1) serves as the sliding friction working surface for the friction-reducing slide plate (1) to cooperate with the pushing slide plate (4).

2. The jacking sliding friction pair for a suspension bridge according to claim 1, characterized in that: There is a bonding layer (13) between the substrate layer (11) and the polytetrafluoroethylene coating (12) of the friction-reducing slide plate (1). The substrate layer (11) and the polytetrafluoroethylene coating (12) are compounded into an integral structure by the bonding layer (13).

3. The jacking sliding friction pair for a suspension bridge according to claim 1 or 2, characterized in that: The substrate layer (11) of the friction-reducing slide plate (1) is a copper plate structure or a common carbon steel plate structure with a thickness of 1 - 5 mm.

4. The jacking sliding friction pair for a suspension bridge according to claim 1 or 2, characterized in that: The thickness of the polytetrafluoroethylene coating (12) of the friction-reducing slide plate (1) is ≤1 mm.

5. The jacking sliding friction pair for a suspension bridge according to claim 1, characterized in that: The pushing slide plate (4) is a stainless steel plate structure, a hard chromium composite plate structure, or a polytetrafluoroethylene composite plate structure; the pushing slide plate with a hard chromium composite plate structure is mainly composed of a steel plate matrix and coated with hard chromium. The pushing slide plate with a hard chromium composite plate structure uses the hard chromium coating layer as the sliding friction working surface for cooperating with the friction-reducing slide plate; the pushing slide plate with a polytetrafluoroethylene composite plate structure is mainly composed of a substrate layer and a polytetrafluoroethylene coating. The pushing slide plate with a polytetrafluoroethylene composite plate structure uses the polytetrafluoroethylene coating as the sliding friction working surface for cooperating with the friction-reducing slide plate.

6. The jacking sliding friction pair for a suspension bridge according to claim 5, characterized in that: There is a bonding layer between the substrate layer and the polytetrafluoroethylene coating of the pushing slide plate with a polytetrafluoroethylene composite plate structure. The substrate layer and the polytetrafluoroethylene coating are compounded into an integral structure by the bonding layer.

7. The jacking sliding friction pair for a suspension bridge according to claim 5 or 6, characterized in that: The substrate layer of the pushing slide plate with a polytetrafluoroethylene composite plate structure is a copper plate structure or a common carbon steel plate structure with a thickness of 1 - 5 mm.

8. The jacking sliding friction pair for a suspension bridge according to claim 5 or 6, characterized in that: The thickness of the polytetrafluoroethylene coating of the pushing slide plate with a polytetrafluoroethylene composite plate structure is ≤1 mm.

9. An installation process of the jacking sliding friction pair for a suspension bridge according to claim 5, characterized in that: The installation process includes the following technical measures: - The pushing slide plate with a stainless steel plate structure is directly fixed on the bottom surface of the saddle; or, the pushing slide plate (4) with a stainless steel plate structure is fixed on the bottom surface of the upper bearing plate (3) at the bottom of the saddle (2) by plug welding. - The friction-reducing slide plate (1) is fixed on the top surface of the lower bearing plate (5) on the grille (6) by countersunk head screws (7). The top surface of the installed countersunk head screws (7) is 0.2 - 0.7 mm lower than the top surface of the friction-reducing slide plate (1), and the overall flatness of the top surface of the friction-reducing slide plate (1) on the lower bearing plate (5) is ≤0.5 mm.

10. The installation process of the jacking sliding friction pair for a suspension bridge according to claim 9, characterized in that: Multiple friction-reducing slide plates (1) are installed on the lower bearing plate (5). Each friction-reducing slide plate (1) is a polygonal structure. These friction-reducing slide plates (1) are closely arranged on the top surface of the lower bearing plate (5), and the length direction of each friction-reducing slide plate (1) corresponds to the pushing direction. The arrangement gap between adjacent friction-reducing slide plates (1) is 40 - 60 mm, and the arrangement gap is used as a lubricating oil groove.

11. An installation process of the jacking sliding friction pair for a suspension bridge according to claim 5, characterized in that: The installation process includes the following technical measures: - The pushing slide plate with a hard chromium composite plate structure takes the upper bearing plate at the bottom of the saddle as the steel plate matrix, coats a hard chromium layer on the bottom surface of the upper bearing plate, and forms the hard chromium coating on the bottom surface of the upper bearing plate after polishing treatment; - The friction-reducing slide plate is fixed on the top surface of the lower bearing plate on the grid by countersunk screws. The top surface of the countersunk screws in place is 0.2 - 0.7 mm lower than the top surface of the friction-reducing slide plate, and the overall flatness of the top surface of the friction-reducing slide plate on the lower bearing plate is ≤ 0.5 mm.

12. The installation process of the jacking sliding friction pair for a suspension bridge according to claim 11, characterized in that: - Multiple friction-reducing slide plates are installed on the lower bearing plate. Each friction-reducing slide plate is of a polygonal structure. These friction-reducing slide plates are densely arranged on the top surface of the lower bearing plate, and the length direction of each friction-reducing slide plate corresponds to the pushing direction. The arrangement gap between adjacent friction-reducing slide plates is 40 - 60 mm, and the arrangement gap is used as the lubricating oil groove.

13. An installation process of the jacking sliding friction pair for a suspension bridge according to claim 5, characterized in that: The installation process includes the following technical measures: - The pushing slide plate with a polytetrafluoroethylene composite plate structure is fixed on the bottom surface of the upper bearing plate at the bottom of the saddle by countersunk screws. The bottom surface of the countersunk screws in place is 0.2 - 0.7 mm higher than the bottom surface of the pushing slide plate, and the overall flatness of the bottom surface of the pushing slide plate is ≤ 0.5 mm; - The friction-reducing slide plate is fixed on the top surface of the lower bearing plate on the grid by countersunk screws. The top surface of the countersunk screws in place is 0.2 - 0.7 mm lower than the top surface of the friction-reducing slide plate, and the overall flatness of the top surface of the friction-reducing slide plate on the lower bearing plate is ≤ 0.5 mm.

14. The installation process of the jacking sliding friction pair for the suspension bridge according to claim 13, characterized in that: - Multiple friction-reducing slide plates are installed on the lower bearing plate. Each friction-reducing slide plate is of a polygonal structure. These friction-reducing slide plates are densely arranged on the top surface of the lower bearing plate, and the length direction of each friction-reducing slide plate corresponds to the pushing direction. The arrangement gap between adjacent friction-reducing slide plates is 40 - 60 mm, and the arrangement gap is used as the lubricating oil groove.

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