Bridge balance axis rotation construction device and method

Abstract

The invention discloses a bridge balance axis swivel construction device and method, and belongs to the technical field of bridge swivel construction. The device comprises a rotating system, a traction system, a temporary consolidation system and a monitoring system, the rotating system comprises a slide way installed at a high position and an integrally-cast rotating body support, and after the slide way is installed, a lower bearing platform is poured; the swivel support comprises an upper seat plate and a lower seat plate which are rotationally connected, the lower seat plate is fixedly connected with a lower bearing platform, the upper seat plate is provided with an upper bearing platform, and the upper bearing platform is used for being fixedly connected with a T structure; a slide way is installed at a high position, and the swivel span construction problem of first swivel and then pouring under the small curve radius and the limited space is solved.

Description

Technical Field

[0001] The invention relates to a bridge balance axis rotation construction device and method, and belongs to the technical field of bridge rotation construction. Background Art

[0002] With the rapid development of the economy and the rapid expansion of transportation networks, the number of new bridges being built in urban infrastructure-intensive areas is also increasing. When building such bridges, it is necessary to ensure the normal operation of existing transportation routes while also ensuring the construction safety and timeliness of the new bridges. Therefore, the application of rotation construction technology is becoming increasingly common.

[0003] Bridge rotation construction refers to a construction method in which a bridge is constructed in a position other than the design axis and then rotated into place through a reasonable rotation system. This method enables safe and rapid construction under restricted construction conditions and has good socioeconomic benefits. Scholars have also conducted a series of studies on the equipment and processes of bridge rotation construction.

[0004] Existing technology addresses the problem of the D2 bridge being unable to complete the pouring of the entire T-span structure before the rotation, as the two piers of the rotating T-structure are located on the same side of the railway line and relatively close together. This means only a 67m T-span can be formed before the rotation, requiring a hanging basket to be used for simultaneous rotation, followed by continued hanging basket casting. Constructing two rotating spans with vastly different lengths side by side in such close proximity, with a narrow curve radius of 340m and confined space, with the rotation first and the pouring later, is currently unfeasible. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a bridge balanced axis rotation construction device and method to achieve the problem of rotating span construction with rotation first and then pouring under small curve radius and confined space; In order to achieve the above objectives / solve the above technical problems, the present invention is implemented by adopting the following technical solutions: First aspect: Bridge balanced axis rotation construction device, including rotation system, traction system, temporary consolidation system and monitoring system; The rotation system includes a high-mounted slideway and an integrally cast swivel support. After the slideway is installed, the lower support is cast. The swivel support includes an upper seat plate and a lower seat plate that are rotatably connected. The upper seat plate is fixedly connected to the lower support. The upper seat plate is provided with an upper support, and the upper support is used to fix the T structure. The traction system includes a jack, a hydraulic pump, an auxiliary reaction seat, a traction reaction seat and a main console. The auxiliary reaction seats are arranged on the outside and inside of the slideway in pairs and are symmetrically arranged. The traction reaction seat is arranged on the outside of the slideway. The pressure output end of the hydraulic pump is connected to the jack. The output end of the jack is connected to a traction rope. The traction rope passes through the traction reaction seat and is connected to the upper platform. The traction system includes two systems: forward and reverse. The temporary consolidation system includes a support leg, a sandbox, a shear support and an anti-torsion support. Before the rotation system rotates, the shear support is arranged between the outer edge of the upper and lower platforms, the support leg and the sandbox are arranged between the upper and lower platforms and along the inner edge of the upper platform, and the anti-torsion support is arranged between the reaction seat and the shear support. The monitoring system includes a temporary monitoring system and a rotation intelligent monitoring system. The temporary monitoring system is used to monitor the center of gravity position of the T structure and the temporary consolidation stress condition during the T structure construction stage to before the temporary consolidation is removed. The rotation intelligent monitoring system is used to detect the stress state of the rotation support and the rotation speed of the T structure during the rotation process after the temporary consolidation is removed.

[0006] Optionally, the swivel support includes an upper seat plate, a lower seat plate and a spherical slide, and the upper seat plate and the lower seat plate are connected by the spherical slide. The swivel support is used to bear the load of the upper bridge to achieve low-friction rotation of the bridge and balance the unbalanced torque of the upper bridge structure, wherein the axis of the swivel support is coaxial with the axis of rotation of the T structure.

[0007] Optionally, the slide includes a slide panel and a slide frame, the slide frame is installed in the steel bars of the lower platform, the slide panel is installed on the slide frame by adjusting bolts, and the slide provides a smooth sliding surface and support point for the support legs during the rotation stage.

[0008] Optionally, the temporary monitoring system includes external sensors and a data collection and analysis module. The external sensors are respectively arranged in the shear support, support legs and sandbox, and are used to monitor the temporary consolidation force data, send it to the data collection and analysis module, and analyze the center of gravity position of the T structure.

[0009] Optionally, the intelligent monitoring system for rotation includes a built-in sensor, an anemometer, a measuring robot and a data collection control module. The built-in sensor is arranged in the concrete below the swivel support to monitor the stress state of the swivel support during the rotation process. The anemometer monitors the wind speed in the rotation construction environment. The measuring robot is used to measure the dynamic data of the rotation process. The data collection control module collects data collected by the built-in sensor and the anemometer.

[0010] A second aspect: A bridge balanced axis rotation construction method, the method comprising: Pour the pile foundation and the lower cap layer at the preset location; Install the slideway at a high position on the lower platform; Cast the lower cap; Cast the rotation bearing pad stone on the lower cap; Install the swivel support on the swivel support pad stone; Install the T structure on the swivel support; The swivel support is rotated through the traction system and the monitoring system until the T structure and the beam are closed.

[0011] Optionally, the high-position installation of the slideway on the lower platform includes: After the lower cap layer and lower reinforcement are installed, insert the slideway support reinforcement into the structural reinforcement; With the center of the swivel support as the center of the circle, it is divided into two inner and outer circles according to the inner and outer contour dimensions of the slideway; The entire slideway is made in equal parts and hoisted on the top surface of the supporting steel bars in a block-by-block installation manner. First, the inner and outer projections of the slideway circumference are measured and laid out, and then the four corners of each slideway are marked. After the first slideway is hoisted, the remaining slideways are hoisted one by one based on the previous one. After the hoisting is completed, adjust the position and elevation of the first block, and then use the first block as a reference to adjust and spot weld the remaining blocks in the forward and backward directions until the slide forms a ring. When the last two blocks are closed, adjust the deviation with a hand winch until both sides of the slide joint are smooth and the slide is spliced ​​into a ring.

[0012] Optionally, after the slide is spliced ​​into a ring, first measure the coordinates of the four corners of the slide in blocks, adjust the ovality of the slide, and then weld the slide frame into a ring to increase its integrity. Then weld the bottom of the slide frame to the cross arm steel bar, and finally weld the slide panel.

[0013] Optionally, the method further includes: After the installation of the pedestal surface reinforcement and embedded parts is completed, the slide is fine-tuned. The fine-tuning is carried out by adjusting the bolts to fine-tune and correct the uneven changes in the slide surface elevation and smoothness caused by the installation of the reinforcement.

[0014] Optionally, the method further includes: The rotating support, traction reaction seat, and thrust reaction steel bars must be embedded in the process of installing the lower base reinforcement. At the same time, the shear support foundation, torsion-resistant steel, and hinged steel sleeves must be embedded in the pre-embedded parts to reserve interfaces for subsequent processes.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This application uses a high-position installation slide to achieve the problem of rotating span construction with rotation first and then pouring under small curve radius and confined space; The proposed rotation method for the construction of cast-in-place continuous box girders uses a hanging basket for construction parallel to the railway. The T-shaped structure has a total length of 136 meters and a total of 16 pairs of blocks. The construction cycle is long. The proposed rotation process saves 80.7 months of time and is expected to save more than HK$100 million in costs. During the construction of the beam body, the construction on the existing line was changed to construction adjacent to the existing line, which greatly reduced the interference with traffic on the existing line and saved approximately HK$10 million in construction supervision and cooperation fees with MTR and relevant units.

[0016] By adopting intelligent monitoring methods, all data can be displayed in real time on the monitoring interface, avoiding the complex measurement procedure of measurement-calculation-measurement for precise positioning, reducing the rotation time by about 30 minutes, reserving operation time for subsequent processes, successfully overcoming the harsh challenge, and eliminating the cost of applying for the railway skylight again. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the planar structure of the rotary system of the present invention; Figure 2 Shown is a schematic diagram of the swivel support structure of the present invention; Figure 3 Shown is a schematic diagram of the traction system of the present invention; Figure 4 Shown is a schematic diagram of the installation of the monitoring system of the present invention; Figure 5 Shown is a projection diagram of the swivel support of the present invention; Figure 6 Shown is a schematic diagram of the built-in sensor of the present invention; Figure 7 Shown is a flow chart of the rotation construction method of the present invention; In the figure: 1. Slide; 2. Rotating support; 3. Support leg; 4. Sandbox; 5. Auxiliary reaction seat; 6. Shear support; 7. Traction reaction seat; 8. Upper seat plate; 9. Spherical slide; 10. Lower seat plate; 11. Anchor bolt; 12. Bolt; 13. Main console; 14. Traction rope; 15. Hydraulic pump; 16. Jack; 17. Torsion support; 18. Upper support platform; 19. Lower support platform. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0021] Example 1, as Figures 1-6 , as shown, a beam balance axis rotation construction device is disclosed, including a rotation system, a traction system, a temporary consolidation system and a monitoring system; The rotation system includes a high-mounted slideway 1 and an integrally cast swivel support 2. After the slideway 1 is installed, a lower support 19 is cast. The integrally cast swivel bearing replaces the conventional on-site assembled swivel ball joint, which has the advantages of easy control of installation accuracy, strong bearing capacity and more reliable working performance.

[0022] The function of the slide 1 is to provide a smooth sliding surface and support point for the support legs during the rotation stage to ensure the safety and stability of the rotation process; and to provide support reaction force for the support legs 3 and sandbox 4 during the T-structure construction stage.

[0023] The swivel support includes an upper seat plate 8 and a lower seat plate 10 that are rotatably connected. The upper seat plate and the lower support are fixedly connected by anchor bolts 11. The upper seat plate is provided with an upper support 18, and the upper support is used to fix the T structure. The upper seat plate 8 and the lower seat plate 10 are rotatably connected by a spherical slide 9, and a sealing ring is also provided between the two. Before rotation, the upper and lower seat plates are fixedly connected by connecting bolts 12. When the rotation work is performed, the bolts 12 are removed. The swivel support plays the role of bearing the upper bridge load, realizing low-friction rotation of the bridge, and balancing the unbalanced torque of the upper structure. The axis of the swivel support is also the axis of rotation of the T structure.

[0024] The traction system includes a jack 16, a hydraulic pump 15, an auxiliary reaction seat 5, a traction reaction seat 7 and a main console 13. The auxiliary reaction seat 5 is arranged on the outside and inside of the slide 1 in pairs, and is arranged symmetrically. The traction reaction seat 7 is arranged on the outside of the slide 1. The pressure output end of the hydraulic pump 15 is connected to the jack 16. The output end of the jack 16 is connected to the traction rope 14. The traction rope 14 passes through the traction reaction seat 7 and is connected to the upper platform 18. The traction system includes two systems: forward and reverse. Two sets of forward and reverse traction systems are set up, which are composed of a main console, two ZLDK-200 automatic continuous jacks, two control pump stations, two S-12 traction ropes, and forward and reverse traction reaction seats. They are hydraulically driven to implement automatic synchronous control, provide continuous traction to drive the T structure to rotate smoothly, and have the advantages of controllable speed and reverse rotation under special conditions.

[0025] The temporary consolidation system includes a support leg 3, a sandbox 4, a shear support 6 and an anti-torsion support 17. Before the rotation system rotates, the shear support is arranged between the outer edge of the upper and lower platforms, the support leg and the sandbox are arranged between the upper and lower platforms and along the inner edge of the upper platform, and the anti-torsion support is arranged between the traction reaction seat and the shear support; The temporary consolidation system is mainly used to resist the unbalanced bending moment during the construction phase of the T structure and the rotational moment caused by external forces. In addition, by adding anti-torsion supports as a stabilization measure for the T structure after the temporary consolidation is removed and before the rotation is started, it is ensured that the T structure has no obvious torsion during the weighing process and before the formal rotation, and does not exceed the red line of the existing structure.

[0026] The torsional support includes torsional support and temporary torsional support. The torsional support is embedded in the middle of the upper and lower abutments and arranged vertically. It plays a role during the construction of the piers and beams. The temporary torsional support is installed between the traction reaction seat and the shear support. It plays a role between the removal of the T-structure anchoring measures and the rotation.

[0027] The monitoring system includes a temporary monitoring system and a rotation intelligent monitoring system. The temporary monitoring system is used to monitor the center of gravity position of the T structure and the temporary consolidation stress condition during the T structure construction stage to before the temporary consolidation is removed. The rotation intelligent monitoring system is used to detect the stress state of the rotation support and the rotation speed of the T structure during the rotation process after the temporary consolidation is removed.

[0028] The intelligent rotation monitoring system uses built-in sensors. The layout of built-in sensors should follow the principles of "convenient layout, prominent focus, reflection of regularity, and optimized layout." They should be deployed before the concrete pouring of the rotation support pad. See the first measurement line for built-in sensor layout: 5 cm above the pad concrete surface, and 20 cm from the support axis, in four directions (90-degree intervals), one sensor each buried at the height of the projected horizontal plane below the rotation support. The second measuring line: 5cm above the concrete surface of the pad stone, 20cm from the outer edge of the swivel support, and at equal distances in 8 directions (45-degree intervals), bury one sensor at the height of the projected horizontal plane under the swivel support.

[0029] Figure 6 Built-in sensor installation: The layout of built-in sensors should minimize conflicts with structural steel bars. At the same time, the wire direction design and cross-fixing work should be done well, and protective measures should be taken to prevent vibration damage during concrete pouring, so as to maximize the survival rate of test components.

[0030] After burial, the wires should be arranged into bundles and pulled out at appropriate locations. A layout map should be drawn, the sensor numbers and initial strain values ​​at different locations should be recorded, and significant markings should be made on site.

[0031] During the specific implementation of this embodiment, the slide frame is installed in the steel bars of the lower platform, and the slide panel is installed on the slide frame through adjustment bolts. The slide provides a smooth sliding surface and support point for the support legs during the rotation stage.

[0032] During the specific implementation of this embodiment, the temporary monitoring system includes external sensors and a data collection and analysis module. The external sensors are respectively arranged in the shear support, support legs and sandbox to monitor the temporary consolidation force data, send it to the data collection and analysis module, and analyze the center of gravity position of the T structure.

[0033] Example 2, as Figure 7 As shown, a bridge balanced axis rotation construction method is disclosed, the method comprising: Pour the pile foundation and the lower cap layer at the preset location; Installation of bottom layer steel bars of lower cap; Install the slideway at a high position on the lower platform; Cast the lower cap; Cast the rotation bearing pad stone on the lower cap; Install the swivel support on the swivel support pad stone; installation of temporary consolidation systems; Installation of upper platform and traction system; Monitoring system installation; Installation of swivel T structure; dismantling of temporary consolidation systems; The T structure is called a configuration; Turning and posture adjustment; Welding reinforcement and hinge sealing construction; The swivel support is rotated through the traction system and the monitoring system until the T structure and the beam are closed.

[0034] In the specific implementation process of this embodiment, the high-position installation of the slideway on the lower platform includes: Because the lower pedestal cannot be poured in two stages, the slideway is installed from a high position. After the lower pedestal cushion and lower reinforcement are installed, the slideway support reinforcement is inserted into the structural reinforcement.

[0035] The slideway support reinforcement is made of φ50mm threaded steel. It is arranged in two inner and outer circles, centered around the center of the designed swivel support, according to the slideway's internal and outer contours. Each slideway has no fewer than four φ50mm support bars. The lower portion of the support bars rests on the top surface of the dense, flat, and sufficiently strong pedestal cushion. The tops of the support bars are positioned at the same height and verified through measurement. Adjustment nuts (mechanical connection sleeves) are installed at the tops to facilitate initial slideway adjustment. The support bars are secured to the lower structural reinforcement of the pedestal using diagonal bracing and U-shaped rings to enhance stability. The entire slide is divided into 8 equal parts and hoisted to the top surface of the supporting steel bars using a block-by-block installation method. Surveyors first measure the inner and outer projections of the slide's circumference, then mark the four corners of each slide. After the first slide is hoisted, the remaining slides are hoisted one by one, using the previous one as a reference. Before hoisting, check the gap between the slide surface and the slide frame (calculated based on the space required for the steel layer under the slide plate, leaving sufficient distance). The gaps between the 8 slides remain consistent. After all hoisting is completed, adjust the position and elevation of the first slide. The installation deviation of the first slide is ±10mm in the radial direction and ±30mm in the circumferential direction. Then, using the first slide as a reference, adjust and spot-weld the remaining slides in both the forward and backward directions until the slide forms a ring. When the last two slides are closed, the deviation is adjusted with a hand winch until both sides of the slide joint are smooth.

[0036] After the slideway is assembled into a ring, the four corners are measured separately and the ovality is adjusted to ensure that the radius deviation in any direction is no more than 5mm. The slideway frame is then welded into a ring to enhance its integrity. The bottom of the frame is then welded to the crossbars, and the slideway panels are finally repaired. Each weld is fully welded, and the height of the weld is slightly lower than the top surface to ensure a smooth surface. Each weld is repaired in two steps: the first layer is repaired after it has cooled naturally, followed by the second layer. This minimizes thermal deformation of the slideway, which can affect the smoothness of both sides of the weld.

[0037] The surface steel bars of the lower pedestal are installed after the slideway is welded. The surface steel bars run through the gap between the slideway panel and the slideway frame, which not only ensures the thickness of the protective layer on the top surface of the lower pedestal but also strengthens the stability of the slideway, ensuring that the slideway will not move horizontally or vertically during the concrete pouring process.

[0038] The rotational support, traction reaction seat, and thrust reaction reinforcement must be pre-embedded during the installation of the lower cap reinforcement. Shear support foundations, torsion-resistant steel, and hinge-sealing reinforcement sleeves are also pre-embedded to reserve interfaces for subsequent processes. Temperature control measures for large-volume concrete are also implemented during this construction period.

[0039] To ensure the construction accuracy of the slideway deck, slideway fine-tuning is performed after the base plate reinforcement and embedded parts are installed. This fine-tuning primarily addresses uneven changes in slideway surface elevation and smoothness caused by reinforcement installation. This is performed using slideway adjustment bolts, with measurements coordinated throughout the entire process. Measurement points should be located at the adjustment bolts, with an appropriate measurement density (every other point) to ensure that the slideway surface elevation difference within any 3-meter arc is no greater than 1mm, and the elevation difference between the inner and outer edges of the slideway is no greater than 1mm.

[0040] During the cap concrete pouring process, protective measures such as covering should be implemented on the slideway to prevent contamination, damage, deformation, or damage. For slideways wider than 1 meter, a vent should be provided in the center. Vibration density should be carefully controlled on both sides of the slideway to minimize vibration leakage and prevent hollowing at the bottom of the slideway slab. The poured concrete surface should not exceed the top surface of the slideway.

[0041] In order to reduce the impact of steel structure corrosion on the performance of the rotation system, after the concrete of the lower base is poured, a layer of 2mm thick stainless steel plate is laid on the surface of the slide. The stainless steel plate is installed in 8 pieces, and its length is the same as the slide blocks.

[0042] The stainless steel is spot welded to the inner and outer edges of the slideway along both sides. The transverse seams between the stainless steel plates are also spot welded. The spacing between the welds should be 200-300mm to avoid excessive deformation and warping caused by through-weld welding. The welds should be polished smooth after natural cooling, and no weld protrusions are allowed. Stainless steel plate welding should be performed during the highest temperature of the day to avoid bulging of the stainless steel plates due to high temperatures after low-temperature welding, which could affect the subsequent rotation work. The transverse seams of the stainless steel plates should be staggered with the transverse seams of the slideway. Carefully review the drawings before installation to ensure that the stainless steel plate seams are under the support foot and walking board.

[0043] The installation methods of the swivel support include: To ensure the position and elevation control accuracy of the swivel support pedestal, the swivel support is constructed using a post-casting method, that is, the support reinforcement is reserved in the pedestal, and the swivel support pedestal reinforcement is tied and concrete is poured after the lower pedestal concrete is completed. Sensors are embedded in the support pedestal; The swivel bearing is installed by integral hoisting, followed by gravity grouting, which can ensure the density of the bearing's underlying layer and the accuracy of the swivel bearing installation.

[0044] During bearing installation, 14 temporary support points are set up. Fourteen φ25mm steel bars are used for these support points. With the measured center of the bearing as the axis, these bars are evenly distributed within the bearing projection. Holes are drilled into the surface of the bearing pad stone and hammered down to compactness before measuring the top elevation of the bars. The reserved grouting thickness is used as the temporary support point elevation. High support points are cut with a hand-grinding wheel, while low support points are welded and then polished to ensure that the height difference between all temporary support points is no more than 1mm. After passing the measurement inspection, the bearing is hoisted and lowered. Surveyors measure and lay out the bearing outline on the top surface of the support pad stone to ensure precise positioning of the swivel bearing, avoiding repeated adjustments.

[0045] Gravity grouting of bearings strictly adheres to the specified water-cement ratio and mixing time for the grouting material. Each mix should be measured with a measuring cup and electronic scale and recorded. During grouting, the grouting outlet should be positioned at the center of the bearing and grouting should be performed slowly until the material reaches the specified position, while simultaneously removing air bubbles.

[0046] The traction system installation method includes: The forward and reverse traction systems are composed of two traction reaction seats, two traction ropes, two sets of ZLDK-200 jacks and pump stations respectively; the ZLDK-200 jacks and pump stations are mobile equipment and are installed before the T structure rotates.

[0047] The traction reaction seat and the boost reaction seat are cast after the lower pedestal is cast. The steel bars need to be embedded before the lower pedestal is cast. The height of the traction reaction seat is adapted to the height of the traction rope. The wire openings of the same group of reaction seats have the same height and traction direction, and the traction rope is tangent to the outer edge of the turntable. There are 4 groups of auxiliary reaction forces, which are symmetrically distributed on the inside and outside of the slideway with the swivel support as the center. After casting, they must not affect the movement of the support legs and must not occupy the slideway space. The relative position with the support legs should also be fully considered so that there is enough space to install auxiliary jacking equipment when the swivel is started. The jacking directions provided by each two groups of boost reaction seats are parallel, and the line connecting the points of action passes through the swivel axis.

[0048] Two pairs of traction cables are installed, each using 12-фs15.2 / 1860 prestressed steel strands and anchored with P-type anchors. The traction cables are installed after the bottom layer of reinforcement on the upper bearing platform is installed. The reverse traction cable is higher than the forward traction cable, with a net spacing of 150mm (no less than 100mm of the cable diameter) between the upper and lower traction cables. The traction cables of a pair must be at the same height. The line connecting the two cable outlets passes through the axis of the swivel, and the line connecting the traction points must also pass through the axis of the swivel to reduce unbalanced torque during traction and increase rotation stability. Each traction cable wraps around the turntable for at least 135°. The angle between the traction cable outlet direction and the tangent of the turntable should not exceed 45°.

[0049] Traction capacity design: The friction coefficient is calculated as follows: μ=M / 1.13G μ—friction coefficient M—rotational moment (t×m) G—total weight of turntable (t) The design static friction coefficient is 0.1, and the design dynamic friction coefficient is 0.06.

[0050] Calculation of traction force and equipment configuration of rotating structure The total rotation weight W=70500KN.

[0051] The friction force calculation formula is F=W×μ.

[0052] When starting, the static friction coefficient is μ = 0.1, and the static friction force F static = W × μ = 7050KN; The coefficient of kinetic friction during rotation is μ = 0.06. Dynamic friction force Fdynamic = W×μ = 4230kN.

[0053] Calculation of rotational pulling force: T=2 / 3×(R·W·μ) / D (5.2.2-2) R - radius of the support plane; W - total weight of rotation; D - turntable diameter; μ - Coefficient of support friction, μstatic = 0.1, μdynamic = 0.06; Calculation results: The maximum traction force T required during startup = 2 / 3 × (R·W·μstatic) / D = 673.3 KN; (5.2.3 - 3) The traction force T required during rotation = 2 / 3 × (R·W·μdynamic) / D = 404 KN.

[0054] The maximum traction capacity of the traction cable: F = 195.3 × 12 = 2343.6 KN Traction force reserve coefficient: C = F / T = 3.48.

[0055] For the cast - in - place continuous box girder constructed by the rotation method of the present invention, the construction is carried out using a hanging basket in the direction parallel to the railway. The total length of the T - structure is 136 m, with a total of 16 pairs of segments, and 11 segments are affected by the MTR red line.

[0056] According to the work efficiency in Hong Kong, the normal construction period for each standard segment is 15 days. For 11 standard segments, a total of 165 days are required, which is 5.3 months. The effective operation time for each skylight across the MTR is 3.5 hours, and each standard segment requires 34 skylights. The construction requirements across the MTR are strict, and there is only 1 skylight per week. That is, each standard segment requires 238 days, and 11 segments across the MTR require 2618 days, which is 86 months. By using the rotation technology, 80.7 months of time is saved. Under the circumstances of labor costs and management fees in Hong Kong, the labor wages and management fees for 80.7 months are quite substantial, and it is expected to exceed HK$100 million.

[0057] During the construction period of the beam body, the construction adjacent to the existing line is changed from the construction on the existing line, which greatly reduces the interference to the operation of the existing line and saves the construction supervision and cooperation fees with the MTR and relevant units by about HK$10 million

[0058] Completing the bridge rotation, attitude adjustment, and stable reinforcement within one skylight point is undoubtedly a huge challenge. By using intelligent monitoring means, all data can be real - time displayed on the monitoring interface, avoiding the complex measurement procedures of measurement - calculation - measurement during precise positioning, reducing the rotation time by about 30 minutes, reserving operation time for subsequent processes, successfully overcoming the severe challenge, and eliminating the cost of applying for a railway skylight again.

[0059] The above - mentioned is only the preferred implementation mode of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. The bridge balance axis rotation construction device is characterized by: Including rotation system, traction system, temporary consolidation system and monitoring system; The rotation system includes a high-mounted slideway and an integrally cast swivel support. After the slideway is installed, the lower support is cast. The swivel support includes an upper seat plate and a lower seat plate that are rotatably connected. The lower seat plate is fixedly connected to the lower support. The upper seat plate is provided with an upper support, and the upper support is used to fix the T structure. The traction system includes a jack, a hydraulic pump, an auxiliary reaction seat, a traction reaction seat and a main console. The auxiliary reaction seats are arranged on the outside and inside of the slideway in pairs and are symmetrically arranged. The traction reaction seat is arranged on the outside of the slideway. The pressure output end of the hydraulic pump is connected to the jack. The output end of the jack is connected to a traction rope. The traction rope passes through the traction reaction seat and is connected to the upper platform. The traction system includes two systems: forward and reverse. The temporary consolidation system includes a support leg, a sandbox, a shear support and an anti-torsion support. Before the rotation system rotates, the shear support is arranged between the outer edge of the upper and lower platforms, the support leg and the sandbox are arranged between the upper and lower platforms and along the inner edge of the upper platform, and the anti-torsion support is arranged between the reaction seat and the shear support. The monitoring system includes a temporary monitoring system and a rotation intelligent monitoring system. The temporary monitoring system is used to monitor the center of gravity position of the T structure and the temporary consolidation stress condition during the T structure construction stage to before the temporary consolidation is removed. The rotation intelligent monitoring system is used to detect the stress state of the rotation support and the rotation speed of the T structure during the rotation process after the temporary consolidation is removed.

2. The bridge balance axis rotation construction device according to claim 1 is characterized in that: The swivel support includes an upper seat plate, a lower seat plate and a spherical slide. The upper seat plate and the lower seat plate are connected by the spherical slide. The swivel support is used to bear the load of the upper bridge to achieve low-friction rotation of the bridge and balance the unbalanced torque of the upper bridge structure. The axis of the swivel support is coaxial with the axis of rotation of the T structure.

3. The bridge balance axis rotation construction device according to claim 1, characterized in that: The slide includes a slide panel and a slide frame. The slide frame is installed in the steel bars of the lower platform. The slide panel is installed on the slide frame through adjustment bolts. The slide provides a smooth sliding surface and support points for the support legs during the rotation stage.

4. The bridge balance axis rotation construction device according to claim 1, characterized in that: The temporary monitoring system includes external sensors and a data collection and analysis module. The external sensors are respectively arranged in the shear support, support legs and sandbox, and are used to monitor the temporary consolidation force data, send it to the data collection and analysis module, and analyze the center of gravity position of the T structure.

5. The bridge balance axis rotation construction device according to claim 1, characterized in that: The intelligent monitoring system for rotation includes a built-in sensor, an anemometer, a measuring robot and a data collection control module. The built-in sensor is arranged in the concrete below the swivel support and is used to monitor the stress state of the swivel support during the rotation process. The anemometer monitors the wind speed in the rotation construction environment. The measuring robot is used to measure the dynamic data of the rotation process. The data collection control module collects data collected by the built-in sensor and the anemometer.

6. A construction method for the bridge balance axis rotation construction device according to any one of claims 1 to 5, characterized in that: The method comprises: Pour the pile foundation and the lower cap layer at the preset location; Install the slideway at a high position on the lower platform; Cast the lower cap; Cast the rotation bearing pad stone on the lower cap; Install the swivel support on the swivel support pad stone; Install the T structure on the swivel support; The swivel support is rotated through the traction system and the monitoring system until the T structure and the beam are closed.

7. The bridge balance axis rotation construction method according to claim 1, characterized in that: The high-position installation of the slideway on the lower platform includes: After the lower cap layer and lower reinforcement are installed, insert the slideway support reinforcement into the structural reinforcement; With the center of the swivel support as the center of the circle, it is divided into two inner and outer circles according to the inner and outer contour dimensions of the slideway; The entire slideway is made in equal parts and hoisted on the top surface of the supporting steel bars in a block-by-block installation manner. First, the inner and outer projections of the slideway circumference are measured and laid out, and then the four corners of each slideway are marked. After the first slideway is hoisted, the remaining slideways are hoisted one by one based on the previous one. After the hoisting is completed, adjust the position and elevation of the first block, and then use the first block as a reference to adjust and spot weld the remaining blocks in the forward and backward directions until the slide forms a ring. When the last two blocks are closed, adjust the deviation with a hand winch until both sides of the slide joint are smooth and the slide is spliced ​​into a ring.

8. The bridge balance axis rotation construction method according to claim 7, characterized in that: After the slide is spliced ​​into a ring, first measure the coordinates of the four corners of the slide in blocks, adjust the ovality of the slide, and then weld the slide frame into a ring to increase its integrity. Then weld the bottom of the slide frame to the cross arm steel bar, and finally weld the slide panel.

9. The bridge balance axis rotation construction method according to claim 8, characterized in that: The method further comprises: After the installation of the pedestal surface reinforcement and embedded parts is completed, the slide is fine-tuned. The fine-tuning is carried out by adjusting the bolts to fine-tune and correct the uneven changes in the slide surface elevation and smoothness caused by the installation of the reinforcement.

10. The bridge balance axis rotation construction method according to claim 7, characterized in that: The method further comprises: The rotating support, traction reaction seat, and thrust reaction steel bars must be embedded in the process of installing the lower base reinforcement. At the same time, the shear support foundation, torsion-resistant steel, and hinged steel sleeves must be embedded in the pre-embedded parts to reserve interfaces for subsequent processes.

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