A construction method for preventing deviation during alternate incremental launching of double steel box girders

Abstract

The present invention belongs to the technical field of jacking construction of steel structure bridges, and specifically relates to a construction method for alternating jacking and anti-deviating of double steel box girders. The present invention includes installing jacking components; assembling guide beams; assembling the bridge deck system of the first internode of the left span and the bridge deck system of the first internode of the right span; jacking the two assembled bridge deck systems with guide beams toward the opposite bank by one internode; jacking the two bridge deck systems toward the opposite bank in turn, and synchronously erecting steel box girders internode by internode until the two bridge deck systems are jacked into place; using the jacking components to drop the bridge deck system to the designed elevation; completing the jacking construction of the bridge deck system; erecting the side span bridge deck systems on both sides in turn, welding and painting the bottom of the side span bridge deck systems on both sides and the above-mentioned jacked-in-place bridge deck systems, and then erecting and welding the middle crossbeam between the two bridge deck systems. While reducing the difficulty of jacking construction of asymmetric steel box girders, the present invention can also ensure the safety and efficient construction of the asymmetric steel box girder, and has the advantages of reasonable force bearing and safety and reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of jacking construction of steel structure bridges, and particularly relates to a construction method for alternately jacking and preventing deviation of double steel box girders. Background Art

[0002] Urban bridge construction often involves crossing complex terrain conditions such as pipelines, waterways, and underground spaces. Steel structure jacking technology has been widely used in steel bridge construction in recent years due to its advantages, including fast construction speed, high installation precision, low operating costs, and strong spanning capacity. Among these, the walking jacking method stands out among various jacking methods due to its cost-effectiveness, convenient construction, and strong spanning capacity, and its application has gradually increased in recent years. At the same time, special-shaped steel arch bridges are widely used in urban landscape bridge design due to their beautiful appearance, good economy, and strong bearing capacity. On the one hand, to meet the needs of high traffic volume and without affecting waterway operation, such bridges typically have larger widths and spans. On the other hand, to meet the design requirements, such bridges often use steel box girders with asymmetric cross-sections, which makes the bridge installation and construction more difficult. Current steel structure jacking technology, as described in Chinese Patent Publication No. "CN115262418A," entitled "A Steel-Concrete Continuous Beam Bridge Construction Process Using Walking-Type Jacking of Steel Box Girders," is primarily suitable for jacking symmetrical structures, but lacks specific optimization for asymmetric structures. This means it cannot be effectively applied to the construction of such asymmetric special-shaped steel arch bridges. When forcibly used, the asymmetry of the single-span bridge deck system that makes up the special-shaped steel arch bridge, as well as the slope of the bridge deck due to the need for drainage, can easily cause lateral imbalance in the single-span bridge deck system during jacking, resulting in significant lateral offset, significantly increasing the difficulty of jacking control and even causing overturning accidents. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a double steel box girder alternating jacking and anti-deviating construction method, which fills the gap in the current jacking construction technology of large-span steel box girder bridges with irregular cross-sections. While reducing the difficulty of jacking construction of asymmetric steel box girders, it can also ensure the safety and efficient construction of the asymmetric steel box girder, and has the advantages of reasonable force and safety and reliability.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A construction method for alternately pushing and preventing deviation of double steel box girders is characterized by comprising the following construction steps:

[0006] Sa. Install jacking components on both sides of the river bank and in the river channel;

[0007] Sb. Sequentially assemble the left guide beam and the right guide beam on the jacking assembly at one side of the river bank;

[0008] Sc. Assemble the bridge deck system of the first section of the left span and the bridge deck system of the first section of the right span on the corresponding guide beams in sequence;

[0009] Sd, push the two assembled bridge decks with guide beams toward the opposite bank one span distance in sequence;

[0010] Se. Install the correction component;

[0011] Sf. Assemble the steel box girder of the next span on the right bridge deck system, then push the right bridge deck system toward the opposite bank by one span, and then assemble the steel box girder of the next span on the left bridge deck system;

[0012] Sg. Push the left bridge deck system toward the opposite bank by one span, and continue to assemble the steel box girder of the next span on the right bridge deck system;

[0013] Sh, reset and correction components;

[0014] Si. Repeat steps Sf-Sh, alternately pushing the two bridge decks toward the opposite bank, and simultaneously erecting steel box girders section by section until both bridge decks are pushed into place;

[0015] After the bridge deck system is pushed into place longitudinally, the corresponding guide beam at the front end of the bridge deck system is removed, and the bridge deck system beams are lowered to the designed elevation using the pushing assembly;

[0016] Sk, remove the deviation-correcting components and jacking components to complete the jacking construction of the bridge deck system;

[0017] S1. Erect the side span bridge deck systems on both sides in sequence, weld and paint the bottom beams of the side span bridge deck systems and the bridge deck systems that have been pushed into place, and then erect and weld the center crossbeam between the two bridge deck systems;

[0018] Sm, complete construction;

[0019] The pushing assemblies are respectively arranged below the longitudinal beams on both sides of each bridge deck system, and are used to push the two bridge deck systems alternately;

[0020] The deviation-correcting assembly is connected to the two bridge deck systems and is used to guide the other bridge deck system, which is currently a moving part, to move forward based on the one bridge deck system, which is currently a static part.

[0021] The correction component includes guide rails installed on adjacent surfaces of the two bridge deck systems, and the guide rails are equipped with sliders that can move forward along the guide rails to form edge nodes; the sliders on each bridge deck system include a front slider and a rear slider, and the two groups of front sliders on the two bridge deck systems are connected to each other through a front constraint rod, and the two groups of rear sliders are connected to each other through a rear constraint rod; the front slider of the first bridge deck system and the rear slider of the second bridge deck system, as well as the rear slider of the first bridge deck system and the front slider of the second bridge deck system are all connected to each other through diagonal rods, and the middle sections of the two diagonal rods are combined with each other to form a planar cross-rod layout, so that the rod length directions of the front constraint rod and the rear constraint rod are perpendicular to the travel direction of the bridge deck system; each diagonal rod, front constraint rod, rear constraint rod and guide rail are all located on the same plane;

[0022] Force sensors for monitoring the tensile force borne by the corresponding restraint bars are arranged on the front and rear restraint bars; displacement sensors for monitoring the jacking height are arranged between the steel box girders and pad beams of each set of bridge deck systems, and inclination sensors for monitoring the inclination angles of the steel box girders in the X-axis and Y-axis directions are also installed on the pad beams of each set of bridge deck systems.

[0023] Preferably, the jacking assembly includes a jacking bracket and a walking jack located on top of the jacking bracket;

[0024] In step Sa, the installation process of the jacking assembly is as follows: first, assemble the jacking brackets on both sides of the river bank, then hoist the walking jack to arrange the pier top, and then use the floating crane in conjunction with the vibratory hammer to insert the support steel pipe piles and anti-collision piles in the river channel, so as to assemble the jacking brackets in the river channel, and then hoist the walking jack to arrange the pier top.

[0025] Preferably, the slider has a guide groove in the shape of a tapered groove, so that it engages with the T-rail-shaped guide rail; a pressure block is arranged at the bottom of the guide groove, and a compression spring is arranged between the pressure block and the bottom of the guide groove, so that the working surface of the pressure block is pressed against the guide rail surface; the guide rail surface is a rack-like structure, and the working surface of the pressure block is correspondingly arranged with serrated engaging teeth for engaging with the guide rail surface, so that the slider can only move forward along the guide rail direction.

[0026] Preferably, each inclined tie rod comprises two coaxially arranged sub-tie rods, and one end of the four sub-tie rods of the two mutually staggered inclined tie rods is respectively hinged to one set of sliders with an axis vertically, and the other end is hinged to the mid-node.

[0027] Preferably, the center node is a square plate with a horizontal plate surface, and the four corner ends of the center node are recessed with slots for the corresponding ends of the sub-pull rods to be inserted into, and the groove walls on both sides of the slots are penetrated by mounting holes; the positioning pin shaft passes through the mounting holes and the matching holes at the corresponding ends of the sub-pull rods in sequence, thereby forming a hinged fit between the center node and the sub-pull rods.

[0028] Preferably, a through hole is horizontally provided at the bottom of the guide groove, the adjusting bolt extends into the through hole and the compression spring is sleeved on the adjusting bolt; one end of the adjusting bolt located in the guide groove is fixed on the pressure block, and the other end of the adjusting bolt is threadedly fitted with an adjusting nut; the arrangement position of the adjusting bolt avoids each other with the hinged action path of the sub-pull rod.

[0029] Preferably, each group of jacking assemblies has three walking jacks, two groups of jacking assemblies are arranged horizontally under the side longitudinal beams of each bridge deck system, and one group of jacking assemblies is arranged under the middle longitudinal beam of each bridge deck system; every two walking jacks are driven by a pump station, and the pump station uses two motors to drive two plunger pumps to provide two independent output pressure oil circuits. Each independent circuit controls a walking jack, and each independent circuit is provided with an overflow valve for limiting the maximum pressure of the circuit.

[0030] Preferably, the construction method further includes a main control system, which has a data storage function, a fault alarm function, a preset automatic shutdown function, a multi-level system authority management function and a software real-time modification function.

[0031] Preferably, the guide rail is provided with a limit stop at the end of the travel of the slider.

[0032] Preferably, the action flow of the correction component is as follows:

[0033] S1. Install the guide rails of the deviation correction assembly to the predetermined positions of the two bridge deck systems respectively;

[0034] S2. Install sliders on the two sets of guide rails of the two bridge deck systems and place them in their initial positions. After the sliders are installed, install the corresponding restraining rods, mid-point nodes, and force sensors in sequence.

[0035] S3. Any bridge deck system is used as a moving part for jacking, while the other bridge deck system becomes a stationary part. At this time, due to the one-way sawtooth coordination between the sliders and the guide rails, all sliders, all restraining rods, mid-points, and force sensors move forward together with the current bridge deck system as the moving part. The other bridge deck system as the stationary part and its guide rail remain stationary until the slider on the other bridge deck system moves along the guide rail to the end position.

[0036] S4. Continue pushing the other bridge deck system. At this time, the original moving parts in the two bridge deck systems in step S3 are converted into static parts in this step, and the original static parts are converted into moving parts in this step, ensuring that the moving parts can drive all the sliders, all the restraining rods, the midpoint nodes and the force sensors to move forward synchronously.

[0037] S5. Reset the deviation-correcting assembly and continue to perform steps S3-S4 in sequence until all the pushing is completed, and then remove the deviation-correcting assembly.

[0038] The beneficial effects of the present invention are:

[0039] 1) Through the above scheme, on the one hand, although the single-span bridge deck system of the existing special-shaped steel arch bridge is an asymmetric structure, the two-span bridge deck systems are symmetrically constructed. Therefore, the present invention improves the propulsion method and proposes the concept of alternating jacking, thereby effectively eliminating a series of risks that may arise from pushing only a single-span bridge deck system. On the other hand, a specially constructed correction component is utilized, and the front and rear restraint rods arranged horizontally on the rod body are used in conjunction with force sensors. Once the two bridge deck systems are deflected due to tilting forward, they will be immediately captured by the force sensors, thereby ensuring timely monitoring and adjustment. At the same time, the sliders and guide rails cooperate with the jacking assembly to achieve the effect of "step-by-step movement, step-by-step capture, and step-by-step adjustment." In addition, the arrangement of the diagonal rods also ensures that the front and rear restraint rods are always in a horizontal state, and ensures the synchronous movement of each slider on the bridge deck system currently serving as a moving part.

[0040] Based on the above structure, the present invention's construction method of alternately cyclically jacking and then connecting the left and right spans is suitable for jacking construction of bridges with central arches, resolving the problem of the central arch hindering jacking construction. The aforementioned offset restraint device also reduces the risks inherent in such construction. Furthermore, this construction method is also applicable to jacking large-scale bridges divided into multiple sections, resolving the issues of requiring a large amount of equipment and the difficulty of synchronous jacking control during jacking construction. This method can reduce the construction difficulty of large-scale bridges, shorten the construction period of such bridges, and broaden the application scenarios of jacking construction, offering excellent economic benefits and promotional value.

[0041] 2) The present invention effectively utilizes the two bridge deck systems in the left and right alternate jacking, without the need to build more temporary structures. In addition to the left and right alternate jacking, the structure of the present invention can be easily improved and extended to other complex jacking construction conditions.

[0042] 3) The jacking assembly of the present invention can realize an asymmetric layout for an asymmetric single-span bridge deck system by using only the longitudinal beam as a reference layout point through targeted installation points, reasonably distribute the support reaction force, reduce the displacement and deformation that are prone to occur in the jacking construction of asymmetric steel box girders, and thus ensure the safe and efficient construction.

[0043] 4) The jacking assembly of the present invention adopts a mode of independent control of multiple circuits. Each independent circuit can be equipped with an independent monitoring and control device. At the same time, a main control system can be used to monitor and adjust the jacking construction process in real time. It is easy to operate, precise in control, and has a high degree of automation. It can effectively protect the safety of the system and reduce construction risks.

[0044] 5) The correction component for alternately pushing asymmetric steel box girders proposed in the present invention, when combined with a pushing component, can effectively suppress the problem of easy deviation of asymmetric steel box girders during pushing, prevent the overturning of steel box girders, reduce the construction difficulty and construction risk of pushing asymmetric steel box girders, and ensure the safe and efficient construction of asymmetric steel box girders.

[0045] 6) The correction component proposed in the present invention has a simple structure, is safe and reliable, easy to operate, and has a low cost, which reduces the demand for high-precision jacking control systems and monitoring systems in the jacking construction of asymmetric steel box girders, allowing such complex jacking construction to be carried out using traditional jacking components and systems, which is conducive to the application and promotion of jacking construction of such structures.

[0046] 7) The deviation-correcting assembly proposed in the present invention has strong applicability and can be applied to various jacking construction techniques including walking-type jacking, and is suitable for the jacking construction of double steel box girders or multiple steel box girders, and can be extended to various beam bodies other than steel box girders.

[0047] 8) The present invention's deflection-correcting assembly, through its restraining rods, addresses the lateral deviation and asynchronous pushing issues common during the jacking construction of asymmetric steel box girders, thereby improving the precision of the jacking process. Furthermore, each restraining rod is equipped with a magnetic flux sensor, which acts as a force sensor. This provides real-time early warning of overturning loads and enables timely control, ensuring safe jacking of asymmetric steel box girders.

[0048] 9) The present invention adopts a disc-type node with a cross-type diagonal rod, which has a simple structure, stable force application, easy disassembly and assembly, and high versatility.

[0049] 10) The deviation-correcting assembly of the present invention has a special action mode, that is, when the bridge deck system, which currently serves as a movable part, generates a forward action, it generates a forward action together with the entire constraint rod, the diagonal rod and the slider; at this time, the force sensor can also move synchronously with the bridge deck system, thereby synchronously sensing the action state of the entire stroke of the bridge deck system, which serves as a movable part, and the slight force changes during the propulsion can be accurately reflected, so as to achieve the purpose of point-by-point and accurate monitoring of the real-time stroke; compared with only the slider on the movable part moving with the movable part while other structures remain stationary, practice has proved that the effect is more significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a three-dimensional diagram of the working state of the present invention;

[0051] Figure 2 for Figure 1 Cross-sectional state diagram of the structure shown;

[0052] Figure 3 Schematic diagram of the three-dimensional structure of the correction component;

[0053] Figure 4 for Figure 3 A partial enlarged view of part I;

[0054] Figure 5 is a schematic diagram of the three-dimensional structure of the slider as an edge node;

[0055] Figure 6 The diagram shows the matching state of the slider and the guide rail;

[0056] Figure 7 is a schematic diagram of the three-dimensional structure of the midpoint;

[0057] Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 This is the action status diagram of the correction component;

[0058] Figure 12 It is a flowchart of the workflow of the present invention.

[0059] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0060] a-bridge deck system; a1-steel box girder; b-guide beam;

[0061] 10-push assembly; 20-correction assembly; 21-guide rail; 21a-limit block;

[0062] 22-slider; 22a-front slider; 22b-rear slider; 22c-guide groove;

[0063] 23a-front restraint rod; 23b-rear restraint rod; 24-sub-pull rod;

[0064] 25-middle node; 25a-slot; 26-pressing block; 26a-engaging tooth; 27-compression spring. DETAILED DESCRIPTION

[0065] For ease of understanding, here we combine Figure 1-12 The specific structure and working mode of the present invention are further described as follows:

[0066] The construction method of the present invention includes a set of jacking and anti-deviating devices, and the embodiment of the jacking and anti-deviating device is constructed as follows: Figure 1-2 Taking the double-span bridge deck system shown as an example, it can be seen that each deck system a is an asymmetrical structure; however, to ensure stability after completion, the two must ultimately form an overall symmetrical structure. During construction, the present invention builds upon the existing walking-type jacking assembly 10 by introducing the concept of alternating jacking, combined with a correction assembly 20, ultimately achieving an alternating, correctable jacking process system. Once jacking is in place, the center beam between the left and right deck systems is then installed, completing the entire bridge construction process.

[0067] Thus, the present invention can shorten the construction period of the jacking operation and the requirements for personnel and equipment through the construction form of alternating jacking of the left and right spans, reduce the difficulty of jacking construction of large-size steel box girders, ensure the safe and efficient construction of asymmetric steel box girder a1, and achieve multiple goals at one stroke.

[0068] 1. Push assembly 10:

[0069] The jacking assembly 10 is arranged in multiple sets, and each set of jacking assemblies 10 includes three walking jacks that constitute the walking jacking assembly 10, and is equipped with corresponding hydraulic pump stations and hydraulic control systems; the walking jacks and corresponding hydraulic accessories are available on the market and will not be described in detail here.

[0070] Furthermore, in actual arrangement, Figure 1-2 The two bridge deck systems shown are each equipped with five jacking assemblies 10, each with three walking jacks. These jacking assemblies are located beneath the longitudinal beams on both sides of each deck system (a), adapting to the longitudinal and transverse beam structure. Considering the unique structure of special-shaped steel arch bridges, the side longitudinal beams have cantilevers, and additional protruding hanger anchor points are designed on the underside of the side longitudinal beams in the jacking section. Therefore, the specific layout requires two walking jacks to be placed horizontally beneath the side longitudinal beams of deck system (a), while one walking jack is placed beneath the center longitudinal beam.

[0071] During the specific design, the jacking assembly 10 may consider using a walking jacking system that integrates mechanical, electrical, hydraulic, and computer control technologies. It may even employ signal redundancy sensing technology, control system electromagnetic compatibility technology, control software anti-interference technology, misoperation lockout, and wedge clamp reverse motion self-locking technology to further enhance the jacking effect. An automatic operation mode may also be used. During the jacking process, the main control system collects data from the force sensors, displacement sensors, and inclination sensors integrated into the structure to achieve real-time monitoring of the steel box girder a1 and even its central axis, ultimately ensuring that the offset of the steel box girder a1 is always limited to the error range. Of course, it is also possible to rely solely on a display structure or alarm structure to perform timely monitoring of the above sensors without using an automated main control system, depending on the site conditions.

[0072] During the design process, one pump station can be used to drive two walking jacks. The pump station uses two motors to drive two plunger pumps to provide two independent output pressure oil circuits. Each independent circuit controls a walking jack. At the same time, each independent circuit is equipped with a relief valve to limit the maximum pressure of the system to protect overall safety. For example, one bridge deck system a uses five sets of jacking assemblies 10, five sets of jacking assemblies 10 are fifteen walking jacks, and two bridge deck systems are thirty walking jacks, forming an even number, so that the above-mentioned pump station can be used to drive the corresponding independent circuit. Furthermore, each independent circuit can even be divided into three sub-circuits: jacking, translation, and correction. These three sub-circuits are restricted from simultaneous operation to further ensure the safety of the jacking process.

[0073] The master control system can utilize a current distributed computer network control system, specifically consisting of a master computer, several field controllers, the aforementioned corresponding sensors, and several data and control lines. The master computer can remotely control the field controllers and display the oil pressure and displacement of the walking jack. It can also provide data storage, fault alarms, preset automatic shutdowns, multi-level system authority management, and real-time software modification capabilities.

[0074] In actual use, the main control system, jacking assembly 10, and correction assembly 20, as well as the various sensors, can be combined with each other to ensure displacement consistency through the synchronous action of the walking jacks, thereby reducing the occurrence of adverse structural deflection. During operation, the walking jacks can be used to achieve synchronous control of the jacking, and displacement sensors installed between the steel box girder a1 and the cushion beam can be used to monitor the jacking height and thus perform vertical jacking control. Inclination sensors installed on the cushion beam at the pier monitor the inclination angles of the steel box girder a1 in the X and Y axes to ensure balance control.

[0075] 2. Correction component 20:

[0076] The deflection-correcting assembly 20, serving as an auxiliary deflection-correcting system for the jacking assembly 10, specifically includes guide rails 21, sliders 22 forming edge nodes, mid-nodes 25, front restraint rods 23a, rear restraint rods 23b, diagonal braces, and force sensors. During operation, by installing this deflection-correcting assembly 20 between the left and right spans of the bridge deck system a, it suppresses the tendency of the asymmetric structure to slide outward under the influence of gravity due to its non-central center of gravity. Ultimately, lateral deflection of the asymmetric steel box girder a1 during jacking can be detected, reduced, and ultimately eliminated.

[0077] When designing specifically, Figure 3 and Figure 6As shown, the guide rail 21 is welded from steel plates and equipped with stiffening ribs. It can be connected to the steel box girder a1 by welding or bolting. Multiple triangular protrusions are provided on the side away from the steel box girder a1, forming a unidirectional, sawtooth-like rack-like rail surface to accommodate the slider 22 and thus limit its movement direction.

[0078] like Figure 3-5 As shown, the slider 22 forms a side node that directly cooperates with the guide rail 21. On the one hand, the slider 22 is provided with a guide groove 22c with a concave groove shape or a groove cavity with a "convex" shape. By relying on the concave structure of the guide groove 22c, Figure 4 The shown card is on the guide rail 21. On the other hand, the groove bottom of the guide groove 22c is arranged with a compression spring 27 and a pressure block 26, and the pressure block 26 is arranged with a serrated engaging tooth 26a to facilitate engaging the rack rail surface on the guide rail 21 to ensure the unidirectional travel effect of the slider 22.

[0079] exist Figure 3 In the embodiment, the slider 22 on the single guide rail 21 is divided into a front slider 22a and a rear slider 22b. The two groups of front sliders 22a on the two guide rails 21 rely on the following Figure 3 The front restraining rods 23a are hinged to each other, with the hinge axis arranged vertically. The two sets of rear sliders 22b on the two guide rails 21 are hinged to each other via the rear restraining rods 23b, with the hinge axis also arranged vertically. Force sensors, specifically magnetic flux sensors, are installed on the transverse restraining rods to monitor the tensile force exerted on each restraining rod in real time, preventing the steel box girder a1 from overturning.

[0080] The inclined rod is as follows Figure 3-4 and Figure 6 As shown, the inclined rod includes four sub-rods 24, each sub-rod 24 forms a cross layout structure, and the adjacent ends are connected by Figure 7 The mid-nodes 25 shown are hinged to each other, and the clamping parts are as follows Figure 7 At the slot 25a shown in the figure, the hinge axis is arranged vertically. At this point, the inclined rod and the two restraining rods together constitute the following Figure 3 The planar tie rod system shown.

[0081] The operation flow of the correction component 20 is as follows:

[0082] S1, install the guide rail 21 of the correction component 20 to the predetermined position of the left and right bridge deck systems a respectively, and refer to the state after installation Figure 1-3 and Figure 8-11 shown.

[0083] S2. After the bridge deck is pushed to the predetermined position, the sliders 22 are installed on the left and right guide rails 21 respectively, and the sliders 22 are placed as shown in the figure. Figure 8 Initial position shown.

[0084] After the slider 22 is installed, the corresponding restraining rod, the middle node 25 and the force sensor are installed in sequence.

[0085] S3, such as Figure 9 As shown, the right bridge deck system a is pushed, and the right slider 22 moves forward together with the right bridge deck system a and the guide rail 21 due to the sawtooth one-way bite state of the tapered guide groove 22c and the pressure block 26; the left slider 22 is in a sawtooth one-way bite state, and cooperates with the force transmitted from the right slider 22 through the planar pull rod system, so that the whole can move along the left guide rail 21 to the end position.

[0086] Figure 9 In the action mode shown, it can be seen that the bridge deck system a, which is currently the moving part, is Figure 9 When the right bridge deck system moves forward, it moves forward along with the entire restraining rod, diagonal stay, and slider 22. At this point, force sensor c synchronizes with bridge deck system a, sensing the current state of the advancing bridge deck system a and achieving real-time monitoring. This provides a more effective monitoring effect than if the bridge deck system moves forward alone while the force sensor only captures the movement at a fixed point.

[0087] In addition, when the unidirectional action is generated due to the sawtooth unidirectional bite state, it is also possible to consider arranging a limit stopper 21a at the limit formation of the guide rail 21 to ensure the limit position state of the slider 22, such as with Figure 9 The specific action mode shown can further ensure the operational safety and action reliability of the component.

[0088] S4. Continue to push the left bridge deck system a. Similarly, the left slider 22 is able to move forward together with the guide rail 21 and even the left bridge deck system a due to the sawtooth one-way bite state with the left guide rail 21. Then, the right slider 22 is driven by the plane pull rod system, and the whole moves along the right guide rail 21 to the end position. Figure 10 shown.

[0089] S5, manually intervene in the compression spring 27 of the slider 22, or mechanically or manually drive the adjusting nut, use the adjusting bolt to pull the pressure block 26 back to compress the compression spring 27, so as to separate the engaging teeth 26a of the pressure block 26 from the rail surface of the guide rail 21, and move the slider 22 to the position as shown in FIG. Figure 11 The initial position of .

[0090] S6, Figure 11 The status shown is Figure 8 In the state shown, steps S3-S5 can be continued in sequence until all the pushing is completed.

[0091] S7, remove the deviation-correcting assembly 20 and complete the jacking.

[0092] On the basis of the above technical solution, Figure 12 As shown, the construction method of the present invention comprises the following steps:

[0093] Sa. Carry out auxiliary structure construction and install jacking components 10 on both sides of the river bank and the river channel;

[0094] Sb, assemble the left guide beam and the right guide beam in sequence on the pushing assembly 10 on one side of the river bank;

[0095] Sc. Assemble the bridge deck system of the first section of the left span and the bridge deck system of the first section of the right span on the corresponding guide beams in sequence;

[0096] Sd, push the two assembled bridge decks with guide beams toward the opposite bank one span distance in sequence;

[0097] Se, install the correction component 20;

[0098] Sf. Assemble the steel box girder of the next span on the right bridge deck system, then push the right bridge deck system toward the opposite bank by one span, and then assemble the steel box girder of the next span on the left bridge deck system;

[0099] Sg. Push the left bridge deck system toward the opposite bank by one span, and continue to assemble the steel box girder of the next span on the right bridge deck system;

[0100] Sh, reset and correction component 20;

[0101] Si. Repeat steps Sf-Sh, alternately pushing the two bridge decks toward the opposite bank, and simultaneously erecting steel box girders section by section until both bridge decks are pushed into place;

[0102] After the bridge deck system is pushed into place longitudinally, the corresponding guide beam at the front end of the bridge deck system is removed, and the bridge deck system beam is lowered to the design elevation using the pushing assembly 10;

[0103] Sk, remove the deviation correction assembly 20 and the jacking assembly 10 to complete the jacking construction of the bridge deck system;

[0104] S1. Erect the side span bridge deck systems on both sides in sequence, weld and paint the bottom beams of the side span bridge deck systems and the bridge deck systems that have been pushed into place, and then erect and weld the center crossbeam between the two bridge deck systems;

[0105] Sm, complete construction.

[0106] Of course, it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also encompasses the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and it is intended that all variations that fall within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0107] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0108] The technology, shape, and structure not described in detail in the present invention are all well-known technologies.

Claims

1. A construction method for double steel box girders with alternating jacking and anti-deviating, characterized in that The construction steps include: Sa. Installing the push assembly (10) on both sides of the river bank and in the river channel; Sb, sequentially assembling the left guide beam and the right guide beam on the jacking assembly (10) at one side of the river bank; Sc. Assemble the bridge deck system of the first section of the left span and the bridge deck system of the first section of the right span on the corresponding guide beams in sequence; Sd, push the two assembled bridge decks with guide beams toward the opposite bank one span distance in sequence; Se, install the correction component (20); Sf. Assemble the steel box girder of the next span on the right bridge deck system, then push the right bridge deck system toward the opposite bank by one span, and then assemble the steel box girder of the next span on the left bridge deck system; Sg. Push the left bridge deck system toward the opposite bank by one span, and continue to assemble the steel box girder of the next span on the right bridge deck system; Sh, reset and correction component (20); Si. Repeat steps Sf-Sh, alternately pushing the two bridge decks toward the opposite bank, and simultaneously erecting steel box girders section by section until both bridge decks are pushed into place; After the bridge deck system is longitudinally pushed into place, the corresponding guide beam at the front end of the bridge deck system is removed, and the bridge deck system is lowered to the design elevation using the pushing assembly (10); Sk, remove the deviation correction component (20) and the jacking component (10), and complete the jacking construction of the bridge deck system; S1. Erect the side span bridge deck systems on both sides in sequence, weld and paint the bottom beams of the side span bridge deck systems and the bridge deck systems that have been pushed into place, and then erect and weld the center cross beam between the two bridge deck systems; Sm, complete construction; The pushing components (10) are respectively arranged below the longitudinal beams on both sides of each bridge deck system, and are used to alternately push the two bridge deck systems; The deviation correction component (20) is connected to the two bridge deck systems and is used to guide the other bridge deck system currently serving as a moving part to move forward based on one of the bridge deck systems currently serving as a static part. The deviation correction component (20) includes a guide rail (21) installed on the adjacent surfaces of the two bridge deck systems, and a slider (22) constituting an edge node that can move forward along the guide rail (21) is installed on each bridge deck system; the slider (22) on each bridge deck system includes a front slider (22a) and a rear slider (22b); the two groups of front sliders (22a) on the two bridge deck systems are connected to each other through a front constraint rod (23a), and the two groups of rear sliders (22b) are connected to each other through a rear constraint rod (23b); the front slider of the first bridge deck system The bridge deck system (22a) and the rear slider (22b) of the second bridge deck system, as well as the bridge deck system (22b) and the front slider (22a) of the second bridge deck system are connected to each other through diagonal rods, and the middle sections of the two diagonal rods are combined with each other to form a planar cross-rod layout, so that the rod length directions of the front constraint rod (23a) and the rear constraint rod (23b) are perpendicular to the travel direction of the bridge deck system; each diagonal rod, the front constraint rod (23a), the rear constraint rod (23b) and the guide rail (21) are all located on the same plane; Force sensors for monitoring the tensile forces borne by the corresponding restraining rods are arranged on the front restraining rods (23a) and the rear restraining rods (23b); displacement sensors for monitoring the jacking height are arranged between the steel box girders and the cushion beams of each group of bridge deck systems; and inclination sensors for monitoring the inclination angles of the steel box girders in the X-axis and Y-axis directions are also installed on the cushion beams of each group of bridge deck systems.

2. The method for alternately pushing and preventing deviation of double steel box girders according to claim 1 is characterized in that: The jacking assembly (10) includes a jacking bracket and a walking jack located on the top of the jacking bracket; In step Sa, the installation process of the jacking assembly (10) is as follows: first, assemble the jacking brackets on both sides of the river bank, then hoist the walking jack to arrange the pier top, then use the floating crane in conjunction with the vibrating hammer to drive the steel pipe piles and anti-collision piles in the river channel, thereby assembling the jacking brackets in the river channel, and then hoist the walking jack to arrange the pier top.

3. The method for alternately pushing and preventing deviation of double steel box girders according to claim 2 is characterized in that: The slider (22) has a guide groove (22c) in the shape of a constricted groove, so as to engage with the T-shaped guide rail (21); a pressure block (26) is arranged at the bottom of the guide groove (22c), and a compression spring (27) is arranged between the pressure block (26) and the bottom of the guide groove (22c), so as to press the working surface of the pressure block (26) against the guide rail (21) surface; the guide rail (21) surface is a rack-shaped structure, and a serrated engaging tooth (26a) for engaging with the guide rail (21) surface is correspondingly arranged on the working surface of the pressure block (26), so that the slider (22) can only move forward along the guide rail (21).

4. The method for alternately pushing and preventing deviation of double steel box girders according to claim 3 is characterized in that: Each inclined tie rod comprises two coaxially arranged sub-tie rods (24), one end of each of the four sub-tie rods (24) of the two mutually staggered inclined tie rods is vertically hinged to one of the sets of sliders (22), and the other end is hinged to the midpoint (25).

5. The construction method for alternately pushing and preventing deviation of double steel box girders according to claim 4 is characterized in that: The middle node (25) is a square plate with a horizontal plate surface. The four corner ends of the middle node (25) are all concave with slots (25a) for the corresponding ends of the sub-pull rod (24) to be inserted. The groove walls on both sides of the slot (25a) are penetrated by mounting holes. The positioning pin shaft passes through the mounting holes and the matching holes at the corresponding ends of the sub-pull rod (24) in sequence, so that the middle node (25) and the sub-pull rod (24) are hingedly matched.

6. A construction method for double steel box girders with alternate jacking and anti-deviating according to claim 2, 3, 4 or 5, characterized in that: A through hole is horizontally provided at the bottom of the guide groove (22c), an adjusting bolt extends into the through hole and a compression spring (27) is sleeved on the adjusting bolt; one end of the adjusting bolt located in the guide groove (22c) is fixed on the pressure block (26), and the other end of the adjusting bolt is threadedly engaged with an adjusting nut; the arrangement position of the adjusting bolt avoids each other with the hinged action path of the sub-pull rod (24).

7. A construction method for double steel box girders with alternate jacking and anti-deviating according to claim 2, 3, 4 or 5, characterized in that: Each group of jacking assemblies (10) has three walking jacks, two groups of jacking assemblies (10) are arranged horizontally under the side longitudinal beams of each bridge deck system, and one group of jacking assemblies (10) is arranged under the middle longitudinal beam of each bridge deck system; every two walking jacks are driven by a pump station, and the pump station uses two motors to drive two plunger pumps to provide two independent output pressure oil circuits, each independent circuit controls one walking jack, and each independent circuit is respectively provided with an overflow valve for limiting the maximum pressure of the circuit.

8. A construction method for double steel box girders with alternate jacking and anti-deviating according to claim 1, 2, 3, 4, or 5, characterized in that: The construction method also includes a main control system, which has a data storage function, a fault alarm function, a preset automatic shutdown function, a multi-level system authority management function and a software real-time modification function.

9. A construction method for double steel box girders with alternate jacking and anti-deviating according to claim 2, 3, 4 or 5, characterized in that: The guide rail (21) is provided with a limit stopper (21a) at the end of the stroke of the slider (22).

10. The construction method for double steel box girders with alternating jacking and anti-deviating according to claim 1, characterized in that: The action flow of the correction component (20) is as follows: S1, installing the guide rails (21) of the deviation correction assembly (20) at predetermined positions of the two bridge deck systems respectively; S2. Install sliders (22) on the two sets of guide rails (21) of the two bridge deck systems respectively, and place the sliders (22) in the initial position; after the sliders (22) are installed, install the corresponding restraining rods, mid-nodes (25) and force sensors in sequence; S3, any one bridge deck system is used as a moving part to be pushed, and the other bridge deck system becomes a static part; at this time, due to the one-way sawtooth cooperation between the slider (22) and the guide rail (21), all the sliders (22), all the constraint rods, the middle nodes (25) and the force sensors all move forward together with the current bridge deck system as the moving part; the other bridge deck system as the static part and the guide rail (21) on the other bridge deck system do not move until the slider (22) on the other bridge deck system moves along the guide rail (21) to the end position; S4, continue to push the other bridge deck system. At this time, the original moving parts in the two bridge deck systems in step S3 are converted into static parts in this step, and the original static parts are converted into moving parts in this step, ensuring that the moving parts can drive all the sliders (22), all the restraining rods, the middle nodes (25) and the force sensors to move forward synchronously; S5, reset the deviation-correcting assembly (20), and continue to perform steps S3-S4 in sequence until all the pushing is completed, and then remove the deviation-correcting assembly (20).

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