Novel mutually-embedded swivel hinge based on bridge pier bottom horizontal swivel method

Abstract

The invention relates to the technical field of bridge construction, in particular to a novel mutually-embedded swivel hinge based on a bridge pier bottom horizontal swivel method, which comprises a swivel hinge upper disc, a swivel hinge lower disc, an upper swivel hinge fixedly connected with the swivel hinge upper disc, and a lower swivel hinge fixedly connected with the swivel hinge lower disc, a rotary positioning pin shaft is mounted between the upper rotary hinge and the lower rotary hinge; a safety leg and a jack counter-force seat are arranged on the rotating hinge lower disc; the lower rotating hinge is a hemisphere with the center protruding, the concave part on the periphery is of a groove-shaped structure with a semi-annular ring face, and the edge is of a table-shaped structure. The upper rotating hinge is a hemisphere with a sunken center, the peripheral protruding part is of a semi-circular ring body structure, and the edge is of a table-shaped structure; the upper rotating hinge and the lower rotating hinge are arranged up and down, and the corresponding surfaces of the upper rotating hinge and the lower rotating hinge are mutually-embedded curved surfaces matched with each other. According to the mutually-embedded curved surface, the area of the contact curved surface is increased, the rotating hinge structure obtains larger bearing capacity and horizontal resistance, and in the bridge rotating process, the overall anti-overturning capacity of the structure is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to a novel interlocking swivel hinge based on a horizontal swivel method at the bottom of a bridge pier. Background Art

[0002] my country's road and railway systems have developed rapidly in recent decades, with the density and total mileage of the line network increasing year by year, and the number of bridges increasing rapidly. For bridges that cross existing operating railway lines, mountain canyons, deep and rapid rivers, or frequently navigable rivers, the bridge rotation construction method has great advantages. It can be constructed safely and quickly without affecting navigation. Therefore, this construction method has received widespread attention from engineering builders.

[0003] The horizontal rotation method of bridges is a construction method that divides the entire span or mid-span of the bridge superstructure into two half spans, places the prefabricated entire span or half span bridge body on a turntable set on the abutment, and then moves it to the final position by horizontal rotation. This construction method is suitable for bridge types such as continuous beam bridges, continuous rigid frame bridges, cable-stayed bridges, and arch bridges. With the development of my country's infrastructure, the horizontal rotation of bridges is also moving towards high-difficulty construction technologies such as large-tonnage and curved bridges.

[0004] The traditional ball joint device is the only movable hinged component during the bridge rotation process and is the main component of the central support system and the balance system. If the ball joint device is not standardized during the manufacturing process or there are problems such as uneven force and improper rotation angle control during the rotation process, the bridge may become unstable and overturn. Preventing bridge overturning is an important measure to ensure construction safety and structural stability. The risk of overturning may cause great economic losses and casualties, so effective measures must be taken to prevent it. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a new type of interlocking swivel hinge based on the horizontal rotation method of the bridge pier bottom, which makes the contact stress of the swivel hinge more uniform during the rotation process, can greatly enhance the anti-overturning performance and structural stability of the swivel hinge, and is thus better suitable for the current difficult construction technologies such as large tonnage and curved bridges in the field of bridge rotation.

[0006] In order to achieve the above purpose, the technical solutions provided are as follows:

[0007] A new type of interlocking bridge swivel hinge based on the horizontal rotation method of the bridge pier bottom, including a swivel hinge upper plate 9 and a swivel hinge lower plate 1, characterized in that it also includes an upper swivel hinge 10 fixed to the swivel hinge upper plate 9 and a lower swivel hinge 4 fixed to the swivel hinge lower plate 1; a rotation positioning pin shaft 8 is installed between the upper swivel hinge 10 and the lower swivel hinge 4; a safety leg 2 and a jack reaction seat 3 are arranged on the swivel hinge lower plate 1; the upper swivel hinge 10, the lower swivel hinge 4 and the rotation positioning pin shaft 8 together constitute the basic part of the swivel hinge; the lower swivel hinge 4 is a hemispherical body with a protruding center, and the concave parts around it are a groove-shaped structure of a semi-annular ring surface, and the edge is a table-shaped structure; the upper swivel hinge 10 is a hemispherical body with a concave center, and the protruding parts around it are a semi-circular ring structure, and the edge is a table-shaped structure; the upper swivel hinge 10 and the lower swivel hinge 4 are arranged up and down, and their corresponding surfaces are mutually matched interlocking curved surfaces.

[0008] Preferably, the upper hinge 10 and the lower hinge 4 are both made of steel, using steel with a strength of Q345, and the steel is subjected to complex and sophisticated manufacturing processes such as assembly welding, quenching, tempering, annealing, and electroplating, and the welds are required to be smooth and flat, without defects such as undercuts, pores, and slag inclusions.

[0009] Preferably, the radius of curvature of the curved surface where the upper hinge 10 and the lower hinge 4 cooperate should be equal, and the error should not be greater than 2 mm; the elevation error of each edge point after the upper hinge 10 and the lower hinge 4 are installed should not be greater than 1 mm, and there should be no flexural deformation; the horizontal cross-section after the upper hinge 10 and the lower hinge 4 are installed should be circular, and its ovality should not be greater than 1.5 mm.

[0010] Preferably, the upper plate 9 of the swivel is fixed to the upper hinge 10, and the lower plate 1 of the swivel is fixed to the lower hinge 4, and the hinge and the swivel are cast on site with RPC concrete (activated carbon concrete).

[0011] Preferably, the rotating positioning pin shaft 8 is a solid cylindrical component made of 45 forged steel.

[0012] Preferably, a rotating positioning pin sleeve 7 is provided at the central axis of the upper rotating hinge 10 and the lower rotating hinge 4, and a rotating positioning pin 8 is installed in the rotating positioning pin sleeve 7. The central axis of the rotating positioning pin sleeve 7 should coincide with the central axis of the upper rotating hinge 10 and the lower rotating hinge 4, with an error of no more than 1 mm, and the central axis of the rotating positioning pin sleeve 7 remains perpendicular to the circular plane of the curved section, with an inclination of ≤3%.

[0013] Preferably, a friction-reducing slide bar reserved groove 5 for installing the friction-reducing slide bar 6 is provided on the top surface of the lower rotating hinge 4 , and the depth of the groove is slightly deeper than the height of the friction-reducing slide bar 6 exposed to the outside.

[0014] Preferably, the anti-friction slide bar 6 is a strip structure made of modified polytetrafluoroethylene plastic alloy which is independent of each other and fixed by screws in the reserved groove 5 of the anti-friction slide bar; the top surface of the anti-friction slide bar 6 inlaid with the lower hinge 4 should be on the same curved surface with an error of no more than 0.2 mm; the static friction coefficient of the anti-friction slide bar 6 is ≤0.05, the dynamic friction coefficient is ≤0.03, and the compressive strength is ≥150 MPa.

[0015] Preferably, the friction-reducing slide strip 6 between the upper hinge 10 and the lower hinge 4 is coated with butter polytetrafluoroethylene powder.

[0016] Preferably, four pairs of symmetrical safety legs 2 are provided on the hinge lower plate 1. The safety legs 2 are reinforced concrete structures and are cast on site using C50 concrete. The height of the top surface of the safety legs 2 from the hinge upper plate 9 is 10 mm.

[0017] Preferably, four pairs of symmetrical jack reaction seats 3 are provided on the hinge lower plate 1, and their heights should be designed with reference to the size of the on-site jacks. The structural form is a "steel tube concrete" structure, and C50 micro-expansive concrete is filled in the steel tube.

[0018] The interlocking curved surface structure of the present invention has the following advantages:

[0019] 1. The interlocking hinge proposed in the present invention is cast by RPC concrete (activated carbon concrete) and steel hinge treated by precision technology. Compared with ball hinges and plane hinges with the same projected area, it has the advantages of high rigidity, high toughness and greatly strengthened weak interfaces. The hinge is more capable of adapting to the eccentric load of the rotating body than traditional ball hinges and plane hinges;

[0020] 2. The contact area of ​​the interlocking hinge proposed by the present invention is (13π+2)·πr 2 For a conventional spherical joint with the same projected area, the contact area calculated according to the specification is 27πr 2 . According to calculations, the contact area of ​​the interlocking hinge is 1.587 times that of the traditional ball hinge. Under the same load, the average stress of the interlocking hinge and the stress on the bottom concrete are smaller than those of the traditional ball hinge, and the uniformity of the stress and deformation of the rotating structure is also relatively good; therefore, the interlocking hinge has better support coordination during the rotation process, and the bridge structure has a greater bearing capacity within the allowable strength range. On the other hand, this advantage makes the stress on the anti-friction slide 6 more uniform, which can prevent the slide from being locally damaged due to excessive stress and affecting the smoothness and stability of the bridge rotation;

[0021] 3. The concave part around the lower hinge 4 of the interlocking hinge proposed in the present invention is a semi-circular ring surface groove structure, and the edge is designed with a terrace structure. This form of design can not only prevent the occurrence of stress concentration, but also prevent the lubricating grease filled between the hinge surfaces from being lost under the heavy pressure of the rotating structure;

[0022] 4. During the construction of the interlocking hinge swivel proposed by the present invention, a large horizontal shear force will appear under the horizontal tension of the traction cable. Due to its special interlocking structure and the particularity of material properties, the horizontal resistance of the swivel can be greatly improved. The stability of the traction force and the safety of the swivel are also improved accordingly;

[0023] 5. The unevenness of the hinge itself can easily cause the elevation of the beam end to change during the horizontal rotation of the beam, thus affecting the line shape of the bridge. The interlocking hinge proposed in the present invention, under the premise that the processing accuracy meets the design requirements, through precise processing, as long as the installation flatness is guaranteed, the elevation of the end of the beam generally changes very little during the horizontal rotation. Therefore, it has good performance in terms of beam posture adjustment after rotation, construction feasibility, and adjustment when problems occur.

[0024] 6. The interlocking swivel hinge proposed in the present invention has a strong ability to adapt to the eccentric load of the swivel, good uniformity of force and deformation of the swivel structure, good support coordination, good stability of traction, good safety of the swivel, and better performance advantages in adjusting the posture of the beam after the rotation, feasible construction performance, and adjustable problems. The hinge is suitable for the current large-tonnage swivel construction and the swivel construction of curved bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the combined action of the interlocking swivel hinges in the present invention;

[0026] Figure 2 The detailed structure diagram of the interlocking swivel hinge in the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the lower plate of the transfer hinge of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the transfer hinge upper plate of the present invention.

[0029] In the figure: a swivel hinge lower plate 1, a safety leg 2, a jack reaction seat 3, a lower swivel hinge 4, a friction-reducing slide reserved groove 5, a friction-reducing slide 6, a rotating positioning pin shaft sleeve 7, a rotating positioning pin shaft 8, a swivel hinge upper plate 9, and an upper swivel hinge 10. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] A new type of interlocking bridge rotation hinge based on the horizontal rotation method of bridge pier bottom, such as Figure 1 As shown, the upper hinge plate 9 is fixed with the upper hinge 10, and the lower hinge plate 1 is fixed with the lower hinge 4; a rotation positioning pin 8 is installed between the upper hinge 10 and the lower hinge 4; a safety leg 2, a jack reaction seat 3, etc. are arranged on the top of the lower hinge plate 1. The upper hinge 10, the lower hinge 4 and the rotation positioning pin 8 together constitute the basic part of the swivel hinge.

[0033] like Figure 2 , 3 The dimensions of the hinge lower plate 1 shown in FIG. 4 are 19 m long, 19 m wide and 1.7 m high. The dimensions of the hinge upper plate 9 are 12 m long, 12 m wide and 1.7 m high. Figure 2 , 3 The upper hinge 10 and the lower hinge 4 shown have a hemispherical part with a radius of 0.65m at the center axis and a semi-circular annular part with a radius of 0.65m at the periphery. After the two are installed, the curvature radii of the matching curved surfaces should be equal, and the error should not exceed 2mm. The interlocking hinge based on the curved surface has a strong ability to adapt to the eccentric load of the swivel, good uniformity of force and deformation of the swivel structure, good support coordination, good stability of traction, good swivel safety, and better performance in adjusting the posture of the beam after the swivel, construction feasibility, and adjustment in case of problems. The hinge is suitable for the current large-tonnage swivel construction and swivel construction of curved bridges.

[0034] The upper hinge 10 and the lower hinge 4 are both made of steel with a strength of Q345. The steel is subjected to complex and sophisticated manufacturing processes such as assembly welding, quenching, tempering, annealing, and electroplating, and the welds are required to be smooth and flat, without defects such as undercuts, pores, and slag inclusions. The friction coefficient between polytetrafluoroethylene and the chrome-plated steel plate is less than the friction coefficient between polytetrafluoroethylene, and the friction coefficient decreases with the increase of the positive pressure. This design form can reduce the starting friction coefficient of the swivel structure and ensure that the swivel structure can "rotate" and "rotate stably".

[0035] like Figure 2The reserved groove 5 of the anti-friction slide shown is slightly deeper than the height of the exposed anti-friction slide 6, and the groove depth is 12mm. The width of the anti-friction slide 6 is 60mm and the height is 22mm. The top surface of the anti-friction slide 6 inlaid with the lower hinge 4 should be on the same curved surface, and the error is not greater than 0.2mm. The static friction coefficient of the anti-friction slide 6 is ≤0.05, the dynamic friction coefficient is ≤0.03, and the compressive strength is ≥150MPa.

[0036] like Figure 2 , 3 The dimensions of the safety leg 2 fixed to the hinge lower plate 1 are shown as 1.6m long, 0.8m wide and 1.4m high. The safety leg 2 adopts a reinforced concrete structure, and on the basis of reasonable reinforcement, necessary anti-shear steel bars are arranged according to the designed internal force.

[0037] like Figure 2 As shown, the swivel hinge lower plate 1, jack reaction seat 3, rotating positioning pin shaft sleeve 7, rotating positioning pin shaft 8, and swivel hinge upper plate 9 are prior arts and will not be described in detail here.

[0038] Example 2

[0039] A construction method for installing a new type of interlocking swivel hinge based on a horizontal swivel method at the bottom of a bridge pier comprises the following steps:

[0040] Step 1: Processing and manufacturing of curved steel hinges.

[0041] The steel hinge structure consists of multiple key components such as the upper curved panel, the lower curved panel, the reinforcing ribs, the annular reinforcing ribs, the rotating positioning pin sleeve 7 and the rotating positioning pin 8. Its manufacturing process is complex and delicate, requiring a high degree of technical ability and equipment support. First, two 40mm thick steel plates are processed into preformed curved panels through a pre-pressing process. The curved panels are made of Q345 steel plates. The preformed curved panels are welded to ensure the consistency and strength of their structure. Then, a hydraulic press and a mold are used to further press the welded curved panels to ensure the geometric accuracy of the curved panels.

[0042] After the structure is formed, the radial reinforcement ribs and the annular reinforcement ribs are welded to the curved plate. The reinforcement ribs are made of Q235 steel plates. The welding ensures the rigidity and stability of the entire steel hinge structure. In order to eliminate the residual stress generated during the welding process, the upper and lower hinges after welding must be annealed. The annealing process can effectively improve the toughness and fatigue life of the material, ensuring the reliability of the steel hinge during use.

[0043] Next, the hinge is finely machined on a CNC vertical lathe, which determines the final dimensional accuracy and surface finish of the hinge. For the groove portion of the lower curved surface where the anti-friction slide bar 6 is embedded, vertical milling is used to ensure that the anti-friction slide bar 6 can be accurately embedded in the curved surface to provide smooth sliding performance. After the above-mentioned mechanical processing is completed, the steel hinge structure must also undergo a series of heat treatment processes such as quenching and tempering to enhance the hardness and wear resistance of the steel hinge.

[0044] Finally, the hinge surface must be electroplated with chrome and nickel. Chrome plating provides excellent wear resistance and a bright surface, while nickel plating increases corrosion resistance, ensuring that the steel hinge can be used for a long time in harsh environments without rust or other damage. In addition, the friction coefficient between polytetrafluoroethylene and chrome-plated steel plates is lower than that between polytetrafluoroethylene, and the friction coefficient decreases with the increase of normal pressure. Through the above complex and sophisticated manufacturing and processing processes, the steel hinge structure finally produced can meet the requirements of high load and high precision use, and has excellent friction performance.

[0045] It should be noted that after the hinge is transported to the construction site, it must be inspected and accepted. During on-site acceptance, in addition to checking the material list, final inspection report, and factory certificate, it is also necessary to visually check whether the weld is flat and saturated, and whether the surface of the curved plate is smooth, without scars or rust. Most importantly, it is necessary to use instruments such as feeler gauges, theodolites, hammer balls, and steel rulers to detect the roughness of the curved plate, the top surface deviation of the anti-friction slide 6, and the center axis deviation of the upper and lower hinges. The roughness of the curved plate is required to be no less than The top surface deviation of the anti-friction slide bar 6 is not greater than 0.2 mm, and the central axis deviation of the upper and lower hinges is not greater than 1 mm.

[0046] Step 2: On-site casting of the swivel lower plate 1, the safety leg 2 and the jack reaction seat 3, and the installation of the lower swivel hinge 4.

[0047] like Figure 2 , 3 As shown, when the concrete of the hinge lower plate 1 is cast on site, concrete with a strength of C50 is used. The dimensions of the hinge lower plate 1 are 19m long, 19m wide and 1.7m high. Four pairs of safety legs 2 are cast on the top of the hinge lower plate 1, and the safety legs 2 are reinforced concrete structures. The dimensions of the safety legs 2 are 1.6m long, 0.8m wide and 1.4m high. On the basis of reasonable reinforcement, the necessary anti-punching steel bars are configured according to the designed internal forces. Four pairs of jack reaction seats 3 are cast on the top of the hinge lower plate 1. The diameter of the horizontal cross-section circle of the jack reaction seat 3 is 0.8m, and the height dimension is designed with reference to the dimensions of the jacks on the construction site. The device is a steel tube concrete structure with built-in C50 micro-expansion concrete, which has the characteristics of simple structure, low cost and strong practicality. After temporarily locking the lower hinge steel panel, PRC concrete (activated carbon concrete) is used for on-site casting.

[0048] Step 3: Install the rotating positioning pin 8 and the anti-friction slide 6, and apply butter and polytetrafluoroethylene powder.

[0049] like Figure 2 , 3 As shown, after the lower hinge 4 is poured with concrete at the construction site, the rotating positioning pin Φ300mm steel rod is placed in the rotating positioning pin sleeve 7. The anti-friction slide 6 is a strip structure made of modified polytetrafluoroethylene plastic alloy that is independent of each other and fixed by screws in the reserved groove 5 of the anti-friction slide. Before installing the anti-friction slide 6, the surface of the lower hinge 4 should be cleaned first. There should be no debris on the hinge surface and the reserved groove 5 for the anti-friction slide 6, and the curved surface should be blown dry. The anti-friction slide 6 is placed in the corresponding reserved groove 5 according to the number of the anti-friction slide 6. The static friction coefficient is ≤0.05, the dynamic friction coefficient is ≤0.03, and the compressive strength is ≥150MPa.

[0050] After the anti-friction slide 6 is installed, the top surface of the modified polytetrafluoroethylene plastic alloy anti-friction slide 6 should be on the same curved surface, with an error of no more than 0.2mm. After passing the inspection, apply butter polytetrafluoroethylene powder between the anti-friction slides 6 on the curved surface, so that the butter polytetrafluoroethylene powder evenly fills the space between the anti-friction slides 6 and is slightly higher than the anti-friction slide 6, ensuring that there is a layer of butter polytetrafluoroethylene powder on the top surface. During the entire installation process, attention should be paid to keeping the curved surface clean, and it is strictly forbidden to bring debris onto the curved surface.

[0051] Step 4: Wrap and seal the gap between the upper and lower hinges, install the upper hinge 10 and pour concrete on the hinge upper plate 9.

[0052] After completing step 3, if Figure 2 , 4 As shown, lift the upper hinge 10, apply a layer of butter polytetrafluoroethylene powder on the curved surface of the upper hinge 10, and then align the upper hinge 10 with the rotating positioning pin 8 and gently drop it onto the lower hinge 4. Use a zipper hoist to fine-tune the position of the upper hinge 10 so that it is horizontal and consistent with the outer ring gap of the lower hinge 4. Remove the excess butter that is squeezed out, and use wide tape to seal the gaps on the edges of the upper and lower hinges. It is strictly forbidden for mud or debris to enter the friction part of the hinge. Finally, cast the hinge upper plate 9. The hinge upper plate 9 is 12m long, 12m wide, and 1.7m high and is cast with C50 concrete. The hinge upper plate 9 is an important structure of the swivel. During the entire rotation process, a multi-directional, three-dimensional stress state is formed. The stress is relatively complex, and a three-way prestressed structure is designed. The hinge upper plate 9 is equipped with three-way prestressed steel bars. Both the longitudinal and transverse prestressed steel strands are adopted. Stranded wire, single-end staggered tensioning, tensioning end uses M15-19 anchor, anchoring end uses M15-19P anchor. Prestressed ducts are all made of corrugated pipe holes, and the corrugated pipes are positioned with steel bar positioning nets. After tensioning, the anchors are sealed and grouting is carried out in time. The vertical prestressed steel bars use JL32 high-strength precision-stretched threaded coarse steel bars with a tensile strength standard value of 930MPa. The pipes use iron pipes and are tensioned on the top surface of the hinge upper plate 9. The fixed end is buried in the concrete of the hinge upper plate 9.

[0053] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A novel interlocking bridge swivel hinge based on the horizontal swivel method of the bridge pier bottom, comprising a swivel hinge upper plate (9) and a swivel hinge lower plate (1), characterized in that: The invention also comprises an upper hinge (10) fixed to the hinge upper plate (9) and a lower hinge (4) fixed to the hinge lower plate (1); a rotation positioning pin shaft (8) is installed between the upper hinge (10) and the lower hinge (4); a safety leg (2) and a jack reaction seat (3) are arranged on the hinge lower plate (1); the upper hinge (10), the lower hinge (4) and the rotation positioning pin shaft (8) together constitute the basic part of the swivel hinge; the lower hinge (4) is a hemispherical body with a protruding center, and the concave parts around it are a groove-shaped structure of a semi-annular ring surface, and the edge is a table-shaped structure; the upper hinge (10) is a hemispherical body with a concave center, and the protruding parts around it are a semi-circular ring structure, and the edge is a table-shaped structure; the upper hinge (10) and the lower hinge (4) are arranged up and down, and their corresponding surfaces are mutually matched interlocking curved surfaces.

2. According to claim 1, a novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom, characterized in that: The upper hinge (10) and the lower hinge (4) are both made of steel with a strength of Q345. The steel is subjected to complex and sophisticated manufacturing processes such as welding, quenching, tempering, annealing, and electroplating, and the weld is required to be smooth and flat without defects such as undercuts, pores, and slag inclusions.

3. According to claim 1, a novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom, characterized in that: The curvature radius of each part of the curved surface where the upper hinge (10) and the lower hinge (4) match should be equal, and the error should not be greater than 2mm; the elevation error of each point on the edge of the upper hinge (10) and the lower hinge (4) after installation should not be greater than 1mm, and there should be no flexural deformation; the horizontal cross-section of the upper hinge (10) and the lower hinge (4) after installation should be circular, and its ovality should not be greater than 1.5mm.

4. According to claim 1, a novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom, characterized in that: The hinge upper plate (9) is fixed to the upper hinge (10), the swivel lower plate (1) is fixed to the lower hinge (4), and the hinge and the swivel plate are cast on site using RPC concrete.

5. According to claim 1, a novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom, characterized in that: A rotating positioning pin sleeve (7) is provided at the central axis of the upper rotating hinge (10) and the lower rotating hinge (4), and a rotating positioning pin (8) is installed in the rotating positioning pin sleeve (7). The central axis of the rotating positioning pin sleeve (7) should coincide with the central axis of the upper rotating hinge (10) and the lower rotating hinge (4), with an error of no more than 1 mm, and the central axis of the rotating positioning pin sleeve (7) is kept perpendicular to the circular plane of the curved cross section, with an inclination of ≤3%.

6. The novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom according to claim 1 is characterized by: The top surface of the lower rotating hinge (4) is provided with a reserved groove (5) for installing the anti-friction sliding strip (6), and the depth of the groove is deeper than the height of the anti-friction sliding strip (6) exposed to the outside.

7. The novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom according to claim 6 is characterized by: The anti-friction sliding strips (6) are independent of each other and are strip structures made of modified polytetrafluoroethylene plastic alloy and fixed by screws in the reserved grooves (5) of the anti-friction sliding strips; the top surfaces of the anti-friction sliding strips (6) embedded in the lower rotating hinge (4) should be on the same curved surface with an error of no more than 0.2 mm; the static friction coefficient of the anti-friction sliding strips (6) is ≤0.05, the dynamic friction coefficient is ≤0.03, and the compressive strength is ≥150 MPa.

8. The novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom according to claim 7 is characterized by: The anti-friction sliding strip (6) between the upper rotating hinge (10) and the lower rotating hinge (4) is coated with butter polytetrafluoroethylene powder.

9. The novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom according to claim 1 is characterized by: The hinge lower plate (1) is provided with four pairs of symmetrical safety legs (2). The safety legs (2) are reinforced concrete structures and are cast on site using C50 concrete. The height of the top surface of the safety legs is 10 mm from the hinge upper plate (9).

10. The novel interlocking swivel hinge based on the horizontal swivel method of bridge pier bottom according to claim 1 is characterized by: The hinge lower plate (1) is provided with four pairs of symmetrical jack reaction seats (3), the height of which should be designed with reference to the size of the on-site jack. The structural form is a "steel tube concrete" structure, and the steel tube is filled with C50 micro-expansive concrete.

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