Railway-crossing swivel bridge safety construction device and construction method thereof

Abstract

The invention discloses a safety construction device and method for a cross-railway swivel bridge, and particularly relates to the technical field of bridge construction.The device comprises a bearing platform, a lower rotating disc, an upper rotating disc and a safety supporting assembly, the lower rotating disc is provided with a lower spherical hinge and an annular sliding way, the upper rotating disc is provided with an upper spherical hinge, and the safety supporting assembly comprises protective supporting feet and a sand box; the safety supporting assembly further comprises a contact supporting foot, and the contact supporting foot comprises a pre-buried part, a butt joint base and an abutting base. The top of the abutting seat is provided with an arc protruding part. In the rotation process, if the beam body and the rotary table are slightly inclined, a rotating pair can be formed by means of contact between the butt joint base and the arc protruding part, the abutting base and the sliding base at the bottom of the abutting base serve as supporting faces of the contact supporting feet, relative parallelism with the annular sliding way can be kept, the contact face is not relatively inclined, and the safety of rotation construction is greatly improved; and the stability of the beam body during swivel construction is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and more specifically, to a safe construction device for a railway-crossing rotating bridge and a construction method thereof. Background Art

[0002] When railway road construction encounters the situation of crossing an existing railway, it is necessary to adopt the rotation method of construction. The rotation method of construction means that after the construction of the cast-in-place beam of the T-shaped rigid frame bridge on the side of the railway operating line is completed, within the railway blockade time, the horizontal rotation is completed through the rotation system to reach the designed position. After the rotation is completed, the upper and lower turntable concrete is sealed to finally complete the closure of the beam body.

[0003] The basic principle of the rotation is that the weight of the main beam is transferred to the upper ball joint through the pier, and the upper ball joint is transferred to the lower ball joint and the pedestal through the polytetrafluoroethylene sliding plate between the ball joints. After the main beam construction is completed, the bracket (hanging basket) is removed, the sand box is emptied, and the entire weight of the beam is transferred to the ball joint, and then weighed and counterweighted. The traction rope buried in the upper turntable and the continuous action jack of the turntable are used to overcome the dynamic friction torque between the upper and lower ball joints and between the support legs and the slideway, so that the beam can be rotated into place.

[0004] The swivel structure consists of a swivel lower turntable, a ball joint, an upper turntable, and a rotating traction system. The swivel lower turntable is the basis for supporting the entire weight of the swivel structure. The main components of the lower turntable include the lower ball joint and its frame, the lower slideway and its frame, the center positioning shaft, and the jack reaction seat. Among them, the lower turntable and the lower slideway are pre-embedded on the pedestal. The main components of the upper turntable include the upper ball joint and its frame, and the support legs. After the above swivel structure is pre-built, the turntable is constructed so that the upper turntable and the support legs are formed in the turntable. The swivel traction rope is pre-embedded in the turntable, and the exposed part of the traction rope is smoothly wrapped around the turntable and placed on the pre-embedded steel bars without interfering with each other.

[0005] The traction system mainly includes the traction reaction seat and the traction rope. Two continuous jacks are arranged horizontally and symmetrically in the same plane on both sides of the turntable. The center line of the jack must be tangent to the outer circle of the upper bearing platform, and the center line height is level with the center line of the embedded steel strand of the upper bearing platform. The jack is fixed to the reaction frame with high-strength bolts, and the reaction frame is fixed to the reaction pier by welding.

[0006] Among them, according to the characteristics of the design and construction, during the rotation process, the entire weight of the swivel is borne by the ball joint, but the swivel structure is prone to tilt due to external conditions or construction. In order to ensure the safety of the construction process, the ring-arranged support legs on the upper turntable are used as inner ring safety legs, and a 3mm~6mm gap is reserved between the slideway. Under the action of the swivel load, a gap is left when rotating along the slideway, which is convenient for determining the load state and adjusting the swivel posture. Clean the slideway and apply grease and polytetrafluoroethylene powder to facilitate the sliding of the support legs. Four jacks are arranged along the outside of the slideway to facilitate the adjustment of the swivel tilt posture during the rotation construction. However, due to the existence of the gap, the entire bridge will also tilt slightly during the rotation process, which will cause the support legs to suddenly contact the slideway and cause impact. Therefore, in order to further improve the safety of the bridge during the rotation construction, it is necessary to reserve some support legs to directly contact the slideway to form auxiliary support and improve the stability of the bridge during the rotation.

[0007] However, for some bridge structures, the center of gravity of their single structure does not fall on the axis of the ball joint. Therefore, after the weighing test and weight adjustment, the center of gravity position will change. However, due to the large structure and heavy weight of the single bridge structure, it is difficult to control accurately. Therefore, during the actual rotation, the center of gravity position of the bridge will change relative to the ball joint. Especially for inclined bridges, its center of gravity will shift to one side, and the bridge body will tilt slightly, causing some of the supports to bear more force. The pressure effect on the bottom and the slideway is relatively strong. In order to increase the supporting surface, the support cannot adopt a roller structure, and a flat plate support is mostly used. Therefore, the plane of the support and the plane of the slideway will be slightly tilted, and one side of the support surface will increase the extrusion with the slideway, affecting the sliding effect of the support, which can easily cause the rotation of the bridge to be suddenly hindered, posing a great safety hazard. Summary of the invention

[0008] The present invention provides a safe construction device and a construction method for a rotating bridge across a railway, and aims to solve the following problem: for the existing support leg structure for continuous support, during actual rotation, the center of gravity of the bridge will change relative to the ball joint, especially for an inclined bridge, the center of gravity will shift to one side, causing a slight tilt between the plane of the support leg and the plane of the slide, thereby increasing the compression between one side of the support leg surface and the slide, affecting the sliding effect of the support leg.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a safety construction device for a cross-railway rotating bridge, comprising a cap, a lower turntable, an upper turntable and a safety support assembly, wherein the lower turntable is provided with a lower ball joint and an annular slideway, the upper turntable is provided with an upper ball joint, the safety support assembly comprises a protective support leg and a sandbox, the lower ball joint and the annular slideway are both pre-embedded in the cap, the protective support leg and the sandbox are located on the annular slideway, the upper ball joint is rotatably matched on the lower ball joint, the turntable is formed on the upper turntable, the safety support assembly further comprises a contact support leg, and the contact support leg comprises a pre-embedded portion, a docking seat and an abutting seat; The embedded part is embedded in the turntable, the docking seat is fixedly installed at the bottom of the embedded part, a circular arc protrusion is arranged on the top of the abutting seat, an arc groove structure matching with the circular arc protrusion is arranged at the bottom of the docking seat, buffer blocks are arranged between the two sides of the docking seat and the abutting seat, and the axial direction of the circular arc protrusion is arranged tangentially along the rotation direction of the contact support foot; A sliding seat is arranged at the bottom of the abutting seat, and the sliding seat is used for sliding on the annular slideway, and a buffer pad is arranged between the abutting seat and the sliding seat.

[0010] In a preferred embodiment, a cavity is provided at the bottom of the abutment seat, and an end of the cavity corresponding to the rotation direction of the contact support leg is set to an opening, and a movable pad is provided in the cavity, and the bottom of the movable pad is slidably matched with the annular slide, and an inclined contact surface is provided at a position of the abutment seat corresponding to the top of the movable pad, and the top of the movable pad is slidably matched with the inclined contact surface, and the height between the inclined contact surface and the annular slide is gradually increased along the rotation direction of the contact support leg.

[0011] In a preferred embodiment, an oil storage cavity is reserved between the movable pad and the cavity of the abutment seat, an oil filling pipe for communicating with the oil storage cavity is provided on the abutment seat, the oil filling pipe is connected to the oil filling pump structure, a pressure sensor is provided in the oil storage cavity, and an oil seepage seam is provided at the bottom of the movable pad.

[0012] In a preferred embodiment, a pre-adjustment mechanism is arranged between the movable pad and the abutment seat, the pre-adjustment mechanism includes a pre-tightening bolt, a pre-tightening seat is fixedly installed at the front end of the movable pad, the pre-tightening bolt passes through the pre-tightening seat and slides in the pre-tightening seat, a threaded seat is fixedly installed on the abutment seat, the pre-tightening bolt is threadedly engaged with the threaded seat, and the head of the pre-tightening bolt forms a compression limit on the pre-tightening seat, and at the same time, an elastic member is arranged between the threaded seat and the pre-tightening seat.

[0013] In a preferred embodiment, the buffer pad is a hollow structure, a hollow cavity is arranged inside the buffer pad, a butt joint is arranged on the buffer pad, the butt joint is communicated with the hollow cavity, and the butt joint is connected to another set of oil injection pumps.

[0014] In a preferred embodiment, a first slide plate structure is fixedly installed at the bottom of the sliding seat, a second slide plate structure is fixedly installed at the bottom of the movable pad, an oil seepage seam is formed at the bottom of the second slide plate structure, and both the first slide plate structure and the second slide plate structure are polytetrafluoroethylene slide plates.

[0015] In a preferred embodiment, an oil scraper rack is fixedly installed at the front end of the movable pad, and a triangular scraper block is fixedly installed in the oil scraper rack. The sharp end of the triangular scraper block corresponds to the position below the grease surface on the annular slide, and a gap is left between the sharp end of the triangular scraper block and the surface of the annular slide.

[0016] In a preferred embodiment, two groups of support rollers are provided in the scraper frame, and the two groups of support rollers are arranged horizontally, one group of support rollers is driven to rotate by a driving device, and a filter belt is arranged outside the support rollers and the triangular scraper block. The filter belt forms a track structure under the support of the support rollers and the triangular scraper block, and a scraper block is fixedly installed on the scraper frame at a position corresponding to the position between the two groups of support rollers, and the bottom end of the scraper block is in sliding contact with the filter belt between the two groups of support rollers.

[0017] In a preferred embodiment, the bottom of the scraper block forms a downward pressure on the filter belt between the two groups of support rollers, causing the filter belt between the two groups of support rollers to sink downward, the scraper block is provided with an inner arc surface corresponding to the position of its front end, and a guide plate is provided in the area corresponding to the upper and lower layers of the filter belt in the scraper frame.

[0018] A safe construction method for a rotating bridge across a railway comprises the following steps: Step 1: Clean the site, dismantle the sandbox, release the temporary lock on the protective legs, and then clean the annular slide and apply grease; Step 2: Install and debug the rotating equipment. Install the jack, hydraulic pump station and main console at the corresponding position, run them without load, and then install the traction rope; Step 3: Weighing test to test the unbalanced torque of the upper structure of the swivel system due to construction, design and other factors, the friction coefficient of the swivel system, etc. Step 4: Test rotation, comprehensively check the traction power system, rotation system, position control system, and anti-tilt insurance system, and test the safety and reliability of the entire system. Then collect various initial data of the rotation system, establish the relationship between the rotation angular velocity of the main bridge pier and the rotation linear velocity of the beam end, and track and monitor the whole process; Step 5: Formal rotation. After the trial rotation is completed, the rotation implementation plan is modified according to the collected data, and the formal rotation is carried out. First, the normal rotation is performed at the corresponding angle, and a 1.5° angle is reserved for jog rotation; Step 6. Fine-tune the locking turntable to seal, accurately measure the plane position and elevation, then weld the reserved steel bars for the pedestal and turntable, and finally pour concrete to lock the beam.

[0019] The beneficial effects of the present invention are as follows: the present invention uses the bottom of the contact support foot to directly slide in contact with the annular slide as a continuous protective support to provide preliminary protection. During the rotation process, if the beam body and the turntable are slightly tilted, a rotating pair can be formed by the contact between the docking seat and the arc protrusion, so that the abutment seat can rotate relative to the docking seat. Moreover, the contact surface between the arc protrusion and the docking seat is large, which can effectively transmit pressure. At the same time, under the above-mentioned rotation change situation, the abutment seat and the sliding seat at its bottom can serve as the support surface of the contact support foot and can maintain relative parallelism with the annular slide. There is no relative inclination of the contact surface, and thus there is no stress concentration phenomenon, and it will not cause excessive pressure on some structures and excessive friction resistance to affect the rotation. The safety of the rotation construction is greatly improved and the stability of the beam body during the rotation construction is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the construction device of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure after the beam body is constructed according to the present invention.

[0022] Figure 3 It is a schematic diagram of the cooperation between the contact support leg and the protective support leg and the annular slideway of the present invention.

[0023] Figure 4 It is a schematic diagram of the cooperation between the contact support leg and the annular slideway of the present invention.

[0024] Figure 5 It is a schematic diagram of the end structure of the contact support leg of the present invention.

[0025] Figure 6 It is a longitudinal cross-sectional view of the contact support leg of the present invention.

[0026] Figure 7 This is a diagram showing the matching state between the docking seat and the abutting seat when the beam body and the turntable are slightly tilted in the present invention.

[0027] Figure 8 It is a schematic diagram of the internal structure of the abutment seat of the present invention.

[0028] Fig. 9 For the present invention Figure 6 A-section structure enlarged view.

[0029] Fig.10 It is a schematic diagram of the internal structure of the improved abutment seat of the present invention.

[0030] Fig.11 The present invention is based on Fig.10 An enlarged view of the local structure of the buffer pad.

[0031] Fig.12 The present invention is based on Fig.10 An enlarged view of the structure of the pre-adjustment mechanism.

[0032] Fig.13 It is a schematic diagram of the overall structure of the sand control mechanism of the present invention.

[0033] Fig.14 It is a flow chart of the construction method of the present invention.

[0034] The accompanying drawings are marked as follows: 1. base; 2. lower turntable; 21. lower ball joint; 22. annular slide; 3. upper turntable; 31. upper ball joint; 4. turntable; 5. protective support foot; 6. contact support foot; 61. embedded part; 62. docking seat; 621. buffer block; 63. abutment seat; 631. arc convex part; 632. inclined contact surface; 633. oil storage cavity; 634. pre-tightening bolt; 635. threaded seat; 636. elastic member; 64. sliding seat; 641. first slide plate structure; 65. buffer pad; 651. hollow cavity; 66. movable pad; 661. second slide plate structure; 662. oil seepage seam; 663. pre-tightening seat; 7. sand box; 8. oil scraper rack; 81. triangular scraper block; 82. support roller; 83. filter belt; 84. scraper block; 85. inner arc surface; 86. guide plate. DETAILED DESCRIPTION

[0035] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0036] Refer to the instruction manual Figures 1 to 13A safety construction device for a railway rotating bridge comprises a cap 1, a lower turntable 2, an upper turntable 3 and a safety support assembly, wherein the lower turntable 2 is provided with a lower ball joint 21 and an annular slide 22, and the upper turntable 3 is provided with an upper ball joint 31, and the safety support assembly comprises a protective support leg 5, a contact support leg 6 and a sandbox 7. Before the construction of the beam body, the above-mentioned rotating system is constructed in advance, that is, the lower ball joint 21 and the annular slide 22 are pre-embedded in the cap 1, and then the protective support leg 5, the contact support leg 6 and the sandbox 7 are pre-positioned and fixed on the annular slide 22 (the protective support leg 5 needs to keep a certain distance from the annular slide 22). The gap is formed by using wedges to pad it, and the contact support leg 6 can directly contact the annular slide 22), forming a temporary support system, and the upper ball joint 31 is rotated to fit on the lower ball joint 21, and then the turntable 4 is constructed on the upper ball joint 31 with the help of the support system formed by the protective support leg 5, the contact support leg 6 and the sand box 7 (the protective support leg 5 and the contact support leg 6 are directly pre-buried in the turntable 4), and then the beam body is constructed on the turntable 4. Before the rotation construction, the supports of the protective support leg 5, the contact support leg 6 and the sand box 7 are kept fixed until the protection support leg 5, the contact support leg 6 and the sand box 7 are released during the rotation construction.

[0037] It should be noted that the rotation construction technologies adopted in this embodiment are all mature technologies in the existing bridge rotation construction schemes. For example, the lower turntable 2, the upper turntable 3, the protective support legs 5 and the sandbox 7 are all commonly used structures. Therefore, this embodiment will not be explained in detail. Among them, this embodiment is mainly based on improving some of the protective support legs 5 in the safety support assembly to form contact support legs 6. Therefore, this embodiment mainly explains the contact support legs 6 and their use schemes. Specifically, the contact support legs 6 include an embedded portion 61, a docking seat 62 and an abutment seat 63. The embedded portion 61 is embedded in the turntable 4 to form a whole with the turntable 4, and the docking seat 62 is fixedly installed. At the bottom of the embedded portion 61, an arc-shaped protrusion 631 is arranged on the top of the abutment seat 63, and an arc-shaped groove structure which is matched with the arc-shaped protrusion 631 is arranged at the bottom of the docking seat 62. Buffer blocks 621 are arranged between the two sides of the docking seat 62 and the abutment seat 63, wherein the axial direction of the arc-shaped protrusion 631 is tangentially arranged along the rotation direction of the contact support leg 6, so that the abutment seat 63 can produce adaptive rotation with the docking seat 62 around the arc-shaped protrusion 631 as the axis, and a sliding seat 64 is arranged at the bottom of the abutment seat 63, and the sliding seat 64 is used to slide on the annular slide 22, and a buffer pad 65 is arranged between the abutment seat 63 and the sliding seat 64.

[0038] After the beam construction is completed, when the rotation construction is required, a certain gap is reserved between the support surface of the protective support leg 5 and the annular slideway 22 as a reserved protection. When the beam body deflects too much, the corresponding protective support leg 5 contacts the annular slideway 22. During the rotation process, the bottom of the contact support leg 6 directly slides in contact with the annular slideway 22 as a continuous protective support for pre-protection. During the rotation process, if the beam body and the turntable 4 are slightly tilted, refer to the attached manual. Figure 7 , a rotating pair can be formed by means of the contact between the docking seat 62 and the arc protrusion 631, so that the abutment seat 63 can rotate relative to the docking seat 62, and the contact surface between the arc protrusion 631 and the docking seat 62 is large, which can effectively transmit pressure. At the same time, under the above-mentioned rotation change, the abutment seat 63 and the sliding seat 64 at the bottom thereof serve as the support surface of the contact support foot 6, which can maintain relative parallelism with the annular slideway 22, and the contact surface has no relative inclination, and thus there is no stress concentration phenomenon, and it will not cause excessive pressure on some structures, and excessive friction resistance will not cause an impact on the rotation, which greatly improves the safety of the rotation construction and enhances the stability of the beam during the rotation construction.

[0039] For further information, please refer to the attached manual. Figure 8 Although a buffer pad 65 (such as rubber) is provided for buffer support, and its compression deformation is used to adapt to the slight change in height when the contact support leg 6 is supported, due to its certain flexibility, the support strength is relatively poor. If the overall weight of the beam body is large and the micro-inclination angle is relatively large, the buffer pad 65 is easily crushed when the support strength of the contact support leg 6 on this side is too large, and the inclination degree is aggravated. Therefore, this embodiment also provides the following technical solutions, specifically, refer to the attached manual Figure 6 and Figure 8 A cavity is provided at the bottom of the abutment seat 63, and the end of the cavity corresponding to the rotation direction of the contact support leg 6 is set to be an opening. A movable pad 66 is provided in the cavity, and the bottom of the movable pad 66 is slidably matched with the annular slide 22. An inclined contact surface 632 is provided at the position of the abutment seat 63 corresponding to the top of the movable pad 66, and the top of the movable pad 66 is slidably matched with the inclined contact surface 632. The height between the inclined contact surface 632 and the annular slide 22 is gradually increased along the rotation direction of the contact support leg 6.

[0040] Furthermore, in actual use, a double support structure can be formed for the contact support foot 6 with the help of the combination of the sliding seat 64 and the buffer pad 65 and the movable pad 66, wherein the actual support height of the abutment seat 63 can also be adjusted by adjusting the relative sliding of the movable pad 66, and the cooperation between the movable pad 66 and the inclined contact surface 632 can form an effective support, thereby avoiding damage to the buffer pad 65 and aggravation of the micro-tilt of the beam body, especially during the rotation process, the movable pad 66 slides relative to the annular slide 22, so the annular slide 22 will provide a backward friction force to the movable pad 66, relative to pushing the wedge deeper into the bottom of the abutment seat 63, thereby ensuring the close cooperation between the movable pad 66 and the abutment seat 63 and the stable transmission of supporting force.

[0041] Furthermore, an oil storage chamber 633 is reserved between the movable pad 66 and the cavity of the abutment seat 63, and an oil injection pipe for communicating with the oil storage chamber 633 is provided on the abutment seat 63. The oil injection pipe is connected to the oil injection pump structure, and a pressure sensor is provided in the oil storage chamber 633. When in use, lubricating oil (or grease) can be injected into the oil storage chamber 633 in advance as filling of the oil storage chamber 633, wherein the oil injection pump continuously injects oil into the oil storage chamber 633, and the high oil pressure causes part of the lubricating oil to flow from the sliding seat 64 and the bottom of the movable pad 66 and The micro gaps between the annular slides 22 are filled, thereby improving the lubrication effect between the contact support foot 6 and the annular slide 22 and reducing the running resistance. The front and rear positions of the movable pad 66 can also be fine-tuned by controlling the amount of oil in the oil storage chamber 633, making the contact support foot 6 more adaptable. The rotation process is summarized. If the rotation is stable, the oil pressure in the oil storage chamber 633 is stable. Therefore, when the oil pressure change in the oil storage chamber 633 is monitored by the pressure sensor, the phenomenon of unstable rotation can be promptly judged and dealt with in time.

[0042] Furthermore, in order to improve the penetration effect of the lubricating oil into the bottom of the movable pad 66, an oil seepage gap 662 is provided at the bottom of the movable pad 66, so that the lubricating oil can more fully penetrate into the bottom of the movable pad 66 to improve the lubrication effect. Among them, since there are relative gaps between the movable pad 66 and the abutment seat 63, between the movable pad 66 and the annular slide 22, and between the sliding seat 64 and the annular slide 22, even if the sealing effect is good, if the oil pressure in the oil storage chamber 633 is high, it will overflow from the corresponding gaps. However, due to the extremely heavy weight of the beam body, the contact between the above-mentioned components is relatively close under pressure, so less lubricating oil seeps out, but when the lubricating oil seeps out, it can just fill the tiny gaps between the structures to improve the lubrication effect.

[0043] Further, in order to better adjust the movable pad 66 and control the initial position of the movable pad 66, this embodiment also provides the following technical solutions. For details, refer to the attached manual. Figures 10 to 12The pre-adjusting mechanism is provided between the movable pad 66 and the abutment seat 63, and the pre-adjusting mechanism includes a pre-tightening bolt 634. The front end of the movable pad 66 (the end corresponding to the rotation forward direction) is fixedly installed with a pre-tightening seat 663. The pre-tightening bolt 634 penetrates the pre-tightening seat 663 and slides with the pre-tightening seat 663. A threaded seat 635 is fixedly installed on the abutment seat 63. The pre-tightening bolt 634 is threadedly engaged with the threaded seat 635, and the head of the pre-tightening bolt 634 forms a pressing limit for the pre-tightening seat 663. At the same time, an elastic member 636 is provided between the threaded seat 635 and the pre-tightening seat 663. Before the actual rotation, the pre-tightening bolt 634 can be tightened to make the movable pad 66 move toward the inside of the abutment seat 63 to adjust the initial position of the movable pad 66, wherein the adjustment of the pre-tightening bolt 634 can be relatively loose, that is, the margin for the movable pad 66 to move outward is retained.

[0044] In addition, hydraulic telescopic equipment, such as a hydraulic cylinder, can be used to drive the position of the movable pad 66 relative to the abutment seat 63, so as to adjust the specific working position of the movable pad 66 (i.e., the support height of the combined structure formed between the abutment seat 63 and the movable pad 66) according to real-time monitoring during the rotation construction.

[0045] Furthermore, the present embodiment also provides an adjustment scheme for the supporting thickness of the buffer pad 65 to adapt to the position adjustment of the movable pad 66. Specifically, the buffer pad 65 is a hollow structure, and a hollow cavity 651 is provided inside the buffer pad 65. A docking tube is provided on the buffer pad 65, and the docking tube is connected to the hollow cavity 651. The docking tube is connected to an oil injection pump (for inputting hydraulic oil). Therefore, in actual use, the hollow cavity 651 can be filled by injecting hydraulic oil into the hollow cavity 651, and the relative thickness of the buffer pad 65 can be increased by taking advantage of the expansion of the buffer pad 65.

[0046] Furthermore, in order to reduce frictional resistance and reduce wear on the annular slide 22, a first slide structure 641 is fixedly installed on the bottom of the sliding seat 64, and a second slide structure 661 is fixedly installed on the bottom of the movable pad 66. An oil seepage seam 662 is formed at the bottom of the second slide structure 661. Both the first slide structure 641 and the second slide structure 661 are polytetrafluoroethylene slide structures.

[0047] It should be noted that in the above-mentioned implementation scheme, the difference in the actual support height of the contact support leg 6 is not large, otherwise the risk is relatively high. Therefore, the actual adjustment range required is not large. Therefore, if the oil pressure is sufficient, the buffer pad 65 can produce a small deformation. At the same time, the inclination angle of the inclined contact surface 632 is not large, so as to ensure the support stability of the movable pad 66 on the abutment seat 63.

[0048] In the above embodiment, the docking seat 62 can be installed with the embedded part 61 by means of a detachable flange connection. Therefore, after actual use, the flange connection can be released. At the same time, the hydraulic oil in the hollow cavity 651 can be removed, and the movable pad 66 can be pulled out to remove the docking seat 62 and the structure below it. Therefore, this part of the structure can be reused many times, reducing material waste and construction costs.

[0049] Furthermore, during the rotation construction process, the site needs to be cleaned, especially the surface of the annular slide 22 needs to be strictly cleaned, and in order to ensure the smoothness of the rotation, a polytetrafluoroethylene slide plate will be placed at the bottom of the protective support leg 5 when necessary. Therefore, in actual use, in order to lubricate the above-mentioned sliding structure, lubricating oil or grease will be evenly applied to the annular slide 22 (since the annular slide 22 is a planar structure, grease is preferred to reduce loss). However, the rotation process has extremely strict operating requirements, and it is necessary to ensure good environmental factors to avoid minor mistakes that affect the overall construction. Especially on the annular slide 22, after applying grease, it is necessary to prevent debris from falling into it. Especially during the rotation process, the bottom of the contact support leg 6 is always in contact with the annular slide 22. If tiny debris enters, it will affect the operating parameters of the contact support leg 6 and affect the control of the overall rotation process. The construction environment is mostly an open-air environment. Although the site can be cleaned in advance to prevent sand and gravel from falling into it, it is inevitable that sand and gravel will fly or bounce onto the annular slide 22 due to environmental wind or the operation of other equipment, and fall on the surface of the grease on the annular slide 22. For this reason, this embodiment also provides the following solution. For details, refer to the attached manual. Fig.13 An oil scraper frame 8 is fixedly installed at the front end of the movable pad 66, and a triangular scraper block 81 is fixedly installed in the oil scraper frame 8. The sharp end of the triangular scraper block 81 corresponds to the position below the grease surface on the annular slide 22, and a gap is left between the sharp end of the triangular scraper block 81 and the surface of the annular slide 22. In actual use, as the contact support foot 6 moves forward, the triangular scraper block 81 can shovel out a layer of grease on the surface of the annular slide 22, and remove the debris attached to the grease surface. At the same time, the triangular scraper block 81 does not contact the annular slide 22, will not cause wear to the annular slide 22, and the grease on the surface of the annular slide 22 will not disappear, and the lubrication effect can still be maintained.

[0050] Furthermore, two groups of support rollers 82 are provided in the scraper frame 8, and the two groups of support rollers 82 are arranged horizontally, and one group of support rollers 82 is driven to rotate by a driving device (such as a motor), and filter belts 83 are provided outside the support rollers 82 and the triangular scraper blocks 81. The filter belt 83 forms a track structure under the support of the support rollers 82 and the triangular scraper blocks 81, and a scraper block 84 is fixedly installed on the scraper frame 8 at a position corresponding to the position between the two groups of support rollers 82. The bottom end of the scraper block 84 is in sliding contact with the filter belt 83 between the two groups of support rollers 82, and then when in use, the filter belt 83 can be driven to operate, and with the help of the movement of the filter belt 83 at the sharp end of the triangular scraper block 81, the debris on the surface of the grease is picked up and transported upward, and then scraped off by the scraper block 84.

[0051] Furthermore, the bottom of the scraper block 84 forms a downward pressure state on the filter belt 83 between the two groups of support rollers 82, so that the filter belt 83 between the two groups of support rollers 82 is recessed downward. At the same time, the scraper block 84 is provided with an inner arc surface 85 corresponding to the position of its front end, and the oil scraper frame 8 is provided with a guide plate 86 corresponding to the area between the upper and lower layers of the filter belt 83. Therefore, during use, as the filter belt 83 continues to run, grease accumulates at the scraper block 84, and under the reverse extrusion of the inner arc surface 85, it tends to flow downward, and then under the guidance of the guide plate 86, it falls back onto the annular slide 22, while debris is restricted by the scraper block 84 and gathers at the scraper block 84.

[0052] It should be noted that due to the setting of the above-mentioned structure, the contact support leg 6 can be well protected, and the cleanliness of the grease on the annular slide 22 can be ensured during the rotation construction process. While being able to effectively protect the contact support leg 6 and other structures, the above-mentioned structure can be reused many times to increase its service life.

[0053] Refer to the instruction manual Fig.14 The present invention also provides a safe construction method for a cross-railway rotating bridge, comprising the following steps: Step 1: Clean the site, dismantle the sandbox 7, release the temporary lock on the protective support 5, and then clean the annular slide 22 and apply grease; Step 2: Install and debug the rotating equipment. Install the jack, hydraulic pump station and main console at the corresponding position, run them without load, and then install the traction rope; Step 3: Weighing test to test the unbalanced torque of the upper structure of the swivel system due to construction, design and other factors, the friction coefficient of the swivel system, etc. Step 4: Test rotation, comprehensively check the traction power system, rotation system, position control system, and anti-tilt insurance system, and test the safety and reliability of the entire system. Then collect various initial data of the rotation system, establish the relationship between the rotation angular velocity of the main bridge pier and the rotation linear velocity of the beam end, and track and monitor the whole process; Step 5: Formal rotation. After the trial rotation is completed, the rotation implementation plan is modified according to the collected data, and the formal rotation is carried out. First, the normal rotation is performed at the corresponding angle, and a 1.5° angle is reserved for jog rotation; Step 6: Fine-tune the locking turntable to seal, accurately measure the plane position and elevation, then weld the reserved steel bars of the pedestal 1 and the turntable 4, and finally pour concrete to lock the beam.

[0054] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A safety construction device for a railway rotating bridge, comprising a cap (1), a lower turntable (2), an upper turntable (3) and a safety support assembly, wherein the lower turntable (2) is provided with a lower ball joint (21) and an annular slideway (22), the upper turntable (3) is provided with an upper ball joint (31), the safety support assembly comprises a protective support leg (5) and a sandbox (7), the lower ball joint (21) and the annular slideway (22) are both pre-buried in the cap (1), the protective support leg (5) and the sandbox (7) are located on the annular slideway (22), the upper ball joint (31) is rotatably engaged with the lower ball joint (21), the turntable (4) is formed on the upper turntable (3), and the characteristics are as follows: The safety support assembly further comprises a contact support foot (6), wherein the contact support foot (6) comprises a pre-embedded portion (61), a docking seat (62) and an abutment seat (63); The embedded portion (61) is embedded in the turntable (4); the docking seat (62) is fixedly mounted on the bottom of the embedded portion (61); a circular arc protrusion (631) is provided on the top of the abutting seat (63); an arc groove structure that matches the circular arc protrusion (631) is provided on the bottom of the docking seat (62); buffer blocks (621) are provided on both sides of the docking seat (62) and between the abutting seat (63); and the axial direction of the circular arc protrusion (631) is arranged tangentially along the rotation direction of the contact support leg (6); A sliding seat (64) is provided at the bottom of the abutting seat (63), and the sliding seat (64) is used to slide on the annular slideway (22). A buffer pad (65) is provided between the abutting seat (63) and the sliding seat (64).

2. A safe construction device for a railway rotating bridge according to claim 1, characterized in that: A cavity is provided at the bottom of the abutment seat (63), and one end of the cavity corresponding to the rotation direction of the contact support foot (6) is set to be an opening. A movable pad (66) is provided in the cavity, and the bottom of the movable pad (66) is slidably matched with the annular slideway (22). An inclined contact surface (632) is provided at a position of the abutment seat (63) corresponding to the top of the movable pad (66), and the top of the movable pad (66) is slidably matched with the inclined contact surface (632). The height between the inclined contact surface (632) and the annular slideway (22) is gradually increased along the rotation direction of the contact support foot (6).

3. The safe construction device for a railway rotating bridge according to claim 2 is characterized in that: An oil storage cavity (633) is reserved between the movable pad (66) and the cavity of the abutment seat (63); an oil injection pipe for communicating with the oil storage cavity (633) is provided on the abutment seat (63); the oil injection pipe is connected to an oil injection pump structure; a pressure sensor is provided in the oil storage cavity (633); and an oil seepage slit (662) is provided at the bottom of the movable pad (66).

4. The safe construction device for a railway rotating bridge according to claim 3 is characterized in that: A pre-adjustment mechanism is provided between the movable pad (66) and the abutment seat (63), and the pre-adjustment mechanism includes a pre-tightening bolt (634). A pre-tightening seat (663) is fixedly installed at the front end of the movable pad (66). The pre-tightening bolt (634) passes through the pre-tightening seat (663) and is slidably engaged with the pre-tightening seat (663). A threaded seat (635) is fixedly installed on the abutment seat (63). The pre-tightening bolt (634) is threadedly engaged with the threaded seat (635), and the head of the pre-tightening bolt (634) forms a pressing limit for the pre-tightening seat (663). At the same time, an elastic member (636) is provided between the threaded seat (635) and the pre-tightening seat (663).

5. The safe construction device for a railway rotating bridge according to claim 4 is characterized in that: The buffer pad (65) is a hollow structure, a hollow cavity (651) is provided inside the buffer pad (65), a butt joint pipe is provided on the buffer pad (65), the butt joint pipe is communicated with the hollow cavity (651), and the butt joint pipe is connected to another set of oil injection pumps.

6. The safe construction device for a railway rotating bridge according to claim 5 is characterized in that: A first slide plate structure (641) is fixedly mounted on the bottom of the sliding seat (64), a second slide plate structure (661) is fixedly mounted on the bottom of the movable pad (66), the oil seepage seam (662) is formed on the bottom of the second slide plate structure (661), and both the first slide plate structure (641) and the second slide plate structure (661) are polytetrafluoroethylene slide plate structures.

7. The safe construction device for a railway rotating bridge according to claim 6 is characterized in that: An oil scraper frame (8) is fixedly mounted on the front end of the movable pad (66), and a triangular scraper block (81) is fixedly mounted in the oil scraper frame (8), wherein the sharp end of the triangular scraper block (81) corresponds to a position below the grease surface on the annular slideway (22), and a gap is left between the sharp end of the triangular scraper block (81) and the surface of the annular slideway (22).

8. The safe construction device for a railway rotating bridge according to claim 7 is characterized in that: The oil scraper frame (8) is provided with two groups of support rollers (82), the two groups of support rollers (82) are arranged horizontally, one group of the support rollers (82) is driven to rotate by a driving device, a filter belt (83) is arranged outside the support rollers (82) and the triangular scraper block (81), the filter belt (83) forms a crawler structure under the support of the support rollers (82) and the triangular scraper block (81), and a scraper block (84) is fixedly installed on the oil scraper frame (8) at a position corresponding to between the two groups of support rollers (82), and the bottom end of the scraper block (84) is in sliding contact with the filter belt (83) between the two groups of support rollers (82).

9. The safe construction device for a railway rotating bridge according to claim 8, characterized in that: The bottom of the scraper block (84) forms a downward pressure state on the filter belt (83) between the two groups of support rollers (82), so that the filter belt (83) between the two groups of support rollers (82) is recessed downward, the scraper block (84) is provided with an inner arc surface (85) at a position corresponding to the front end thereof, and the oil scraper frame (8) is provided with a guide plate (86) at a region corresponding to the upper and lower layers of the filter belt (83).

10. A construction method of the safety construction device for a railway rotating bridge according to claim 9, characterized in that: The following steps are involved: Step 1: clean the site, dismantle the sandbox (7), release the temporary lock of the protective support leg (5), and then clean the annular slideway (22) and apply grease; Step 2: Install and debug the rotating equipment. Install the jack, hydraulic pump station and main console at the corresponding position, run them without load, and then install the traction rope; Step 3: Weighing test to test the unbalanced torque of the upper structure of the swivel system due to construction, design and other factors, the friction coefficient of the swivel system, etc. Step 4: Test rotation, comprehensively check the traction power system, rotation system, position control system, and anti-tilt insurance system, and test the safety and reliability of the entire system. Then collect various initial data of the rotation system, establish the relationship between the rotation angular velocity of the main bridge pier and the rotation linear velocity of the beam end, and track and monitor the whole process; Step 5: Formal rotation. After the trial rotation is completed, the rotation implementation plan is modified according to the collected data, and the formal rotation is carried out. First, the normal rotation is performed at the corresponding angle, and a 1.5° angle is reserved for jog rotation; Step 6: Fine-tune the locking turntable and seal it, accurately measure the plane position and elevation, then weld the steel bars reserved for the pedestal (1) and the turntable (4), and finally pour concrete to lock the beam body.

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