Swing moving type vertical splicing construction method for side span beam section

Abstract

The invention provides a swinging and moving type vertical splicing construction method for a side span beam section. The swinging and moving type vertical splicing construction method comprises the following steps that (1) a single-section beam section of a side span is hoisted from a transport ship located at a bridge site and swung and moved to the side span side of a tower column; (2) turning over a single beam section from a horizontal state to a vertical state, lowering and storing a beam; (3) the step (1) and the step (2) are repeated, the single beam sections are hoisted to the sliding support section by section, and after the tail beam section of the side span beam sections of the same span is turned to be in the vertical state from the horizontal state, vertical splicing installation is conducted; (4) the single-section beam section slides to the position under the beam section hoisted by the vertical hoisting station, the beam section is lowered to the beam section located on the sliding support to be in butt joint, the beam section which is in butt joint into a whole is lifted upwards, vertical splicing of the single-span beam section is completed, and the side-span beam section in the vertical state is adjusted to be in the horizontal state; (5) pulling one end of the side span beam section to the pier top of the auxiliary pier, and connecting the other end of the side span beam section through a sling; and (6) repeating the steps until the construction of the cable-free area girder section of the bridge is completed.

Description

Technical Field

[0001] The present application relates to the technical field of suspension bridge construction, and in particular to a swing-type vertical splicing construction method for side span beam sections. Background Art

[0002] The construction method of suspension bridge was invented in the early 19th century, and many bridges use this structure. Modern suspension bridges are evolved from cable bridges. The scope of application is mainly large-span and extra-large-span highway bridges. Today's large-span bridges all use this structure, which is the main form of large-span bridges.

[0003] Large-span suspension bridges often have a relatively high navigation clearance, and the height difference between the steel beam and the platform is relatively large. Due to the terrain conditions, the height between the steel beam at the root of the side span tower and the platform of the suspension bridge in mountainous areas is often also relatively large. Therefore, there are problems such as large material investment, high operational safety risks, and long construction period in erecting the scaffolding. Especially for the cable-mounted crane method, there are also costs such as equipment rental, on-site transportation slideways and walkways for steel beams, foundation treatment, and installation, dismantling, entry and exit, etc., which make the costs even higher. Summary of the invention

[0004] The purpose of the present application is to provide a swinging vertical splicing construction method for side span beam segments, which reduces the use area of ​​the horizontal platform, reduces the construction area of ​​the support, reduces the investment in support materials and the labor and machinery costs for setting up and dismantling the support, and greatly saves construction costs.

[0005] In order to achieve the above objectives, this application provides the following technical solutions: A swing-type vertical assembly construction method for side span beam sections comprises the following steps: (1) A cable-mounted crane and a winch are used to lift the single-section beam section of the side span from the transport ship at the bridge site and swing it to the side span side of the tower. The cable-mounted crane is installed on the main cable on the side of the tower near the middle span, and the winch is installed on the pedestal on the side span side. (2) Use the vertical lifting station installed on the main cable near the side span of the tower column to flip the single-section beam section hoisted to the side span of the tower column from a horizontal state to a vertical state, and lower it to the sliding bracket for beam storage; (3) Repeat the above steps (1) and (2) to hoist the single beam sections onto the sliding brackets one by one, and after the last beam section of the side span beam section of the same span is flipped from a horizontal state to a vertical state, the side span beam section is vertically assembled and installed; (4) The single-section beam segments falling on the sliding bracket are slid one by one to the bottom of the beam segment hoisted by the vertical lifting station, and the hoisted beam segments are lowered to the beam segments on the sliding bracket by the vertical lifting station to form a whole, and then the beam segments that are connected as a whole are lifted upward to a height position higher than the single-section beam segment until the vertical splicing of the single-span beam segment is completed, and then the side span beam segments in the vertical state are adjusted to the horizontal state by using two vertical lifting stations; (5) One end of the side span beam section is pulled to the top of the auxiliary pier by a winch installed on the pier column on the side away from the tower column, and the other end of the side span beam section is connected by a temporary sling; (6) After repeating the above steps (1) to (4) to complete the assembly and direction adjustment of the next side span beam section, use the cable-mounted crane and vertical lifting station to lift the side span beam section and connect it with the installed side span beam section until the construction of the bridge cable-free area beam section is completed.

[0006] Further configuration: in the above (1), after the single-section beam section is lifted upward from the transport ship by the cable-mounted crane to the position, the traction rope of the winch is connected to the single-section beam section, the winch is started, and the single-section beam section is pulled toward the side span. While the winch is pulling and collecting the rope, the cable-mounted crane's wire-retracting device cooperates to release the steel strand to complete the swinging construction of the single-section beam section.

[0007] Further setting: the maximum swing angle of the lifting of a single beam section shall not exceed 20°.

[0008] Further setting: when the swing angle of a single beam section exceeds 20°, multiple swings are required.

[0009] It is further configured that when the single-section beam section in (2) is flipped from a horizontal state to a vertical state, rotating lifting ears are provided on both sides of the single-section beam section along the bridge direction, and the vertical lifting station flips the single-section beam section in the air by rotating the lifting ears.

[0010] It is further provided that: the rotating lifting lug comprises a connecting seat, a connecting column and a hydraulic rod, the end of the connecting column is hinged to the connecting seat, the cylinder of the hydraulic rod is rotatably connected to the connecting column, and the extended end of the hydraulic rod piston rod is rotatably connected to the connecting seat, and when the piston rod of the hydraulic rod extends out of the cylinder, the connecting seat is pushed to rotate relative to the connecting column; The connecting seat of the rotating lifting ear is connected to the single-section beam section, the steel strand of the vertical lifting station is connected to the connecting column of the rotating lifting ear, and the connecting seat is pushed and rotated by a hydraulic rod to drive the single-section beam section connected to the connecting seat to rotate.

[0011] Further configuration: the sliding support includes a sliding track and a beam section support frame, the sliding track is arranged along the bridge direction, a weight shifter is arranged at the bottom of the beam section support frame, and the beam section support frame moves on the sliding track through the weight shifter to transfer and shift the beam section.

[0012] Further configuration: the beam section support frame includes a beam section sliding base support and an anti-overturning bracket, the beam section sliding base support is configured as a rectangular frame, a flat joint and a diagonal brace are provided inside the frame, the anti-overturning bracket includes a supporting steel pipe with one end connected to the beam section sliding base support and the other end connected to the upper ear plate of the beam section, and a group of supporting steel pipes are provided on each side of the beam section facade.

[0013] It is further provided that: during the process of vertically joining and butting the beam segments in (4), a butt-jointing force transmission device for connecting the upper and lower single beam segments is provided at the beam segment joint, and the butt-jointing force transmission device includes force transmission connection plates respectively connected to the upper and lower single beam segments at both ends; When vertically splicing and butting the beam segments, first slide the single-section beam segment on the ground sliding bracket into place and fix it as the base segment. At the same time, install the butt-jointing force transmission device on one side on the base segment, and install the butt-jointing force transmission device on the other side on the lifted beam segment to be spliced. The beam segment to be assembled is lifted into the air by a vertical lifting station, and the vertical lifting station lowers the beam segment to be spliced ​​and brings it closer to the beam segment of the base segment. It is precisely aligned through the butt-jointing force transmission device, and then the upper and lower beam segments are welded.

[0014] It is further provided that: when the side span beam segment includes a plurality of span beam segments, the step of transversely butting the side span beam segments with large sections includes: The beam section to be installed is laterally butted against the erected beam section, and the vertical coordination of the beam section to be installed and the erected beam section is adjusted by adjusting the closing posture through temporary weighting. The longitudinal deviation of the beam section to be installed and the erected beam section is adjusted by pulling the erected beam section with traction equipment. After the pre-assembly of the beam sections reaches the required accuracy, tie rods are installed at the joints, and the tie rods are used to adjust the gap of the transverse splicing joints of the beam sections.

[0015] Compared with the prior art, the solution of this application has the following advantages: 1. In the swing-type vertical splicing construction method of the side span beam section involved in the present application, a transport ship is used to transport the single-section beam section of the side span to the vicinity of the tower column, and then the single-section beam section to be spliced ​​is transferred to the side span side of the tower column through cable load adjustment and cooperation with the vertical lifting station. At the same time, the vertical lifting station is used in cooperation with the rotating lifting lug to realize the aerial flipping of the single-section beam section, so as to adjust the horizontal state to the vertical state, which is conducive to the vertical splicing operation of the subsequent beam sections. The present application adopts the vertical splicing method to splice the single-section beam section, which reduces the use area of ​​the horizontal platform, reduces the construction area of ​​the bracket, reduces the investment in bracket materials and the labor and machinery costs of bracket erection and dismantling, and greatly saves construction costs.

[0016] 2. In the swing-type vertical splicing construction method of the side span beam section involved in the present application, considering that the horizontal pulling force provided by the winch is limited, and at the same time in order to reduce the angle between the main beam truss of the cable-mounted crane and the traveling mechanism itself, it is necessary to control the maximum swing angle of the beam end hoisting within 20° to ensure the stability of the swing-type construction of the beam section hoisting.

[0017] 3. In the swing-type vertical splicing construction method of the side span beam section involved in the present application, the beam section can be flipped in the air by using a vertical lifting station in conjunction with a rotating lifting lug, without relying on ground space, with higher space utilization and more convenient operation.

[0018] 4. In the swing-type vertical splicing construction method of the side span beam segment involved in the present application, when the beam segments are vertically spliced ​​and connected, a connecting force transmission device is provided at the joint of the upper and lower beam segments, which can provide a guiding effect when the beam segments are vertically spliced, and can also improve the connection strength of the upper and lower single-section beam segments.

[0019] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 A process flow chart of an embodiment of a swing-type vertical splicing construction method for a side span beam section of the present application; Figure 2 A schematic diagram of lifting a single beam section from a transport ship in one embodiment of the swing-shift vertical assembly construction method of the side span beam section of the present application; Figure 3 A schematic diagram of a swing-shifting vertical assembly construction method of a side span beam segment of the present application, in which a single beam segment is pulled by a winch to swing-shift; Figure 4 A schematic diagram of a single beam section performing secondary swinging in one embodiment of the swinging vertical splicing construction method of the side span beam section of the present application; Figure 5 A schematic diagram of vertical splicing and butting of beam segments in one embodiment of a swing-type vertical splicing construction method for side span beam segments of the present application; Figure 6 A schematic diagram of an embodiment of the swing-shift vertical splicing construction method of the side span beam segment of the present application, in which the beam segment is vertically spliced ​​and supported on the side of the tower column by steel pipe attachment; Figure 7 A schematic diagram of an embodiment of the swing-shift vertical assembly construction method of the side span beam section of the present application, in which two vertical lifting stations are used to flip the beam section and to pull and swing it onto the auxiliary pier; Figure 8A schematic diagram of hoisting a single-section beam section of a second span side span beam section in one embodiment of a swing-shift vertical assembly construction method for a side span beam section of the present application; Fig. 9 A schematic diagram of flipping a beam section using a cable-mounted crane and a vertical lifting station in one embodiment of a swing-shift vertical assembly construction method for a side span beam section of the present application; Fig.10 A schematic diagram showing the completion of the construction of the cable-free area in one embodiment of the swing-shift vertical splicing construction method of the side span beam section of the present application; Fig.11 A schematic diagram of the structure of a rotating lifting lug in one embodiment of the swing-shift vertical assembly construction method of the side span beam section of the present application; Fig.12 A schematic diagram of the structure of the butt-jointed force transmission device and the steel pipe attachment in one embodiment of the swing-shift vertical splicing construction method of the side span beam section of the present application; Fig.13 This is a schematic structural diagram of a sliding track in one embodiment of a swing-type vertical splicing construction method for a side span beam section of the present application. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0022] Those skilled in the art will appreciate that, unless expressly stated, the "said" and "the" used herein may also include plural forms. It should be further understood that the term "including" used in the specification of the present application refers to the presence of the features, parts and / or components, but does not exclude the implementation of other features, parts, components and / or combinations thereof supported by the technical field. The term "and / or" used herein refers to at least one of the items defined by the term, for example, "A" and / or "B" may be implemented as "A", or as "B", or as "A and B".

[0023] In the description of the present application, the directions or positional relationships indicated by words such as "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the exemplary directions or positional relationships shown in the accompanying drawings. They are for the convenience of describing or simplifying the description of the embodiments of the present application, and do not indicate or imply that the referred device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0025] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0027] For the installation and construction of steel box girders in the cable-free area of ​​suspension bridges, please combine Figures 1 to 13 The present application provides a swing-type vertical assembly construction method for side span beam segments, which uses a cable-mounted crane 2 to swing the water-transported beam segments to land, so as to transport the large-scale bridge segments to the side span for lifting construction, and then complete the aerial turning of the bridge segments through a vertical lifting station 4 and a rotating lifting lug 5, so that the horizontal assembly of the bridge segments can be adjusted to vertical assembly, reducing the horizontal space occupied when the bridge segments are spliced, reducing the investment in support materials and the labor and machinery costs of setting up and dismantling the support, which is conducive to improving construction efficiency and shortening construction period.

[0028] The side span cable-free area of ​​the suspension bridge to be constructed in this embodiment is from the top of the auxiliary pier of the side span of the bridge to the first cable beam section of the middle span, a total of 7 side span beam sections. In addition, the site where the tower column of this embodiment is located is relatively narrow, the ground is undulating, and large-scale lifting equipment cannot reach the construction site. Therefore, in order to meet the construction needs of the side span beam section of this embodiment, this application is equipped with a cable-mounted crane 2, a vertical lifting station 4, a winch 3, a car crane, a heavy object shifter and a matching vertical jack, a temporary sling 91 and other mechanical equipment to carry out the construction of the side span of the bridge.

[0029] Therefore, please combine Figure 1 The swing-type vertical splicing construction method of the side span beam section of the present application comprises the following steps: (1) The single-section beam section of the side span is lifted from the transport ship 1 at the bridge site and swung to the side span side of the tower by means of a cable-mounted crane 2 and a winch 3. The cable-mounted crane 2 is installed on the main cable on the side of the tower close to the mid-span, and the winch 3 is installed on the pedestal on the side of the side span.

[0030] Specifically, please combine Figure 2 and Figure 3 Before lifting the side span beam section, the present application needs to install a cable-mounted crane 2 at the middle span main cable near the tower column, two vertical lifting stations 4 are installed on the side of the tower column near the side span, and a winch 3, a weight shifter and a matching vertical jack are installed on the land on the side of the side span. The bridge segment is transported to the bridge location by a transport ship 1. The transport ship 1 of this embodiment is affected by navigation conditions and anchored in the sea area 49.9m away from the tower column, and the bridge segment is lifted by the cable-mounted crane 2.

[0031] The cable-mounted crane 2 vertically lifts the single-section beam segment from the transport ship 1 to the specified height, and the winch 3 installed on the auxiliary pier cap is connected to the lifted single-section beam segment through the steel strand to pull the single-section beam segment to swing toward the side span. After the single-section beam segment is lifted into place by the cable-mounted crane 2, the worker uses the tower crane and the lifting beam to connect the traction rope of the winch 3 to the detachable connecting plate on the lifting device for lifting the single-section beam segment, starts the winch 3, and slowly pulls the single-section beam segment toward the side span. While the winch 3 pulls and retracts the rope, the retracting and releasing device of the cable-mounted crane 2 also cooperates to release the steel strand to complete the swinging construction.

[0032] In the subsequent vertical splicing steps, the present embodiment needs to transfer the single beam section by means of a sliding bracket in cooperation with a weight shifter, and the horizontal distance between the transport ship 1 and the sliding bracket is relatively far. Considering the limited horizontal pulling force provided by the winch 3, and in order to reduce the angle between the main beam truss of the cable-mounted crane 2 and the walking mechanism itself, it is necessary to control the maximum swing angle of the beam end hoisting within 20°. Therefore, when the swing angle of the single beam section hoisting exceeds 20°, multiple swing shifts are required. In the present embodiment, two swing shifts are required to transfer the single beam section on the transport ship 1 to the sliding bracket, and two relatively independent traction systems are required to provide the horizontal force of the swing shift traction, one of which is the swing shift traction system at the pedestal, and the other is the swing shift traction system at the lower crossbeam. In addition, in the present embodiment, after the first swing shift, the cable-mounted crane 2 releases its fixation with the main cable, moves along the main cable toward the tower column to the top of the single beam section and fixes it, and then performs the second swing shift. In addition, the maximum swing shift angles of the two swing shifts of the single beam section are 15° and 11° respectively.

[0033] (2) The single-section beam segment is flipped from a horizontal state to a vertical state using a vertical lifting station 4, and is lowered to a sliding bracket disposed on the side span pedestal for beam storage.

[0034] Please combine Figure 4After the single-section beam section of this embodiment is vertically lifted and horizontally swung by the cable-mounted crane 2 through the lower crossbeam, the vertical lifting station 4 located on the side span of the tower column is connected to the single-section beam section. In this application, rotating lugs 5 are arranged on both sides of the single-section beam section along the bridge direction, and the vertical lifting station 4 realizes the aerial steering of the single-section beam section by connecting with the rotating lugs 5.

[0035] Please combine Fig.11 The rotating lifting lug 5 includes a connecting seat 51, a connecting column 52 and a hydraulic rod 53. The end of the connecting column 52 is hinged to the connecting seat 51, the cylinder of the hydraulic rod 53 is rotatably connected to the connecting column 52, and the extended end of the piston rod of the hydraulic rod 53 is rotatably connected to the connecting seat 51. When the piston rod of the hydraulic rod 53 extends out of the cylinder, the connecting seat 51 can be pushed to rotate relative to the connecting column 52. The connecting seat 51 of the rotating lifting lug 5 is connected to the single-section beam segment, and the steel strand of the vertical lifting station 4 is connected to the connecting column 52 of the rotating lifting lug 5. The hydraulic rod 53 pushes the connecting seat 51 to rotate, so as to drive the single-section beam segment connected to the connecting seat 51 to rotate, and then complete the turning of the beam segment.

[0036] After the vertical lifting station 4 is flipped to a vertical state through the rotating lifting lug 5, the single beam section in the vertical state can be lowered onto the sliding bracket, which is used for the transportation and storage of the beam section. The sliding bracket of this embodiment includes a sliding track 61 and a beam section support frame 63. The sliding track 61 is arranged along the bridge direction, and a strip foundation is provided at the lower part of the sliding track 61 to ensure sufficient foundation bearing capacity. In addition, two groups of sliding rails are provided, and a transverse track 62 is provided between the two groups of sliding rails 61, and one group of the tracks can be used for the storage of the beam section. A weight shifter is provided at the bottom of the beam section support frame 63, and the beam section support frame 63 can realize transportation and displacement on the sliding track 61 through the weight shifter.

[0037] Please combine Fig.12 and Fig.13 The beam section support frame 63 of this embodiment includes a beam section sliding base 631 and an anti-overturning bracket 632. The beam section sliding base 631 is set as a rectangular frame, and a flat joint and a diagonal brace are arranged inside it to ensure that the beam section sliding base 631 has sufficient structural strength to meet the load-bearing requirements of the beam section and ensure the stability of the beam section during sliding. The anti-overturning bracket 632 includes a supporting steel pipe connected to the beam section sliding base 631 at one end and connected to the upper ear plate of the beam section at the other end. The supporting steel pipe is respectively provided on both sides of the beam section facade to prevent the beam section from overturning. The supporting steel pipe is rotatably connected to the beam section sliding base 631, so that it can adapt to the support of beam sections of different thicknesses.

[0038] Since the distance between the diaphragm and the bottom is large when the beam section slides vertically, the bending stiffness of this part of the beam section is small and it is easy to bend and deform. In order to solve the problem that the top plate, bottom plate and U rib of the cavity part are easy to deform when the beam section slides vertically, a 2mm steel plate is used at the cantilever end of the beam section to weld the longitudinal stiffening plate of the steel beam with the beam section sliding bottom support 631, and a stiffening plate is welded along the transverse welding section for reinforcement. The beam section is locally strengthened to improve the bending resistance of the beam section when it slides vertically.

[0039] After the vertical beam section is firmly connected to the beam section support frame 63, the winch 3 is used to pull the beam section support frame 63 to drive the beam section to slide into place on the sliding track 61. The sliding support is also provided with a vertical jack, and the height deviation of the sliding track 61 is adjusted by the vertical jack to ensure the smooth sliding of the beam section. During the sliding process, the traction speed of the winch 3 needs to be controlled not to exceed 20cm / min, and the last 0.5m before sliding into place should be appropriately decelerated, and the last 15cm before each sliding into place is adjusted by inching to avoid excessive sliding.

[0040] (3) It is known that the side span in this embodiment includes 7 single-section beam segments. Therefore, the 7 single-section beam segments can be divided into two spans for construction, wherein the first span includes 3 single-section beam segments and the second span includes 4 single-section beam segments. Therefore, when constructing the first span beam segment, repeat the above steps (1) and (2) to hoist the single-section beam segments onto the sliding bracket one by one, and after the last beam segment of the side span beam segment of the same span is flipped from a horizontal state to a vertical state, the side span beam segment is vertically assembled and installed.

[0041] (4) Please combine Figure 6 , slide the single-section beam segments on the sliding bracket one by one to the bottom of the beam segment hoisted by the vertical lifting station 4, use the vertical lifting station 4 to lower the hoisted beam segment to the beam segment on the sliding bracket to connect them into a whole, then lift the beam segment connected as a whole upward to a height position higher than the single-section beam segment until the vertical splicing of the single-span beam segment is completed, and then use two vertical lifting stations 4 to adjust the side span beam segment in the vertical state to a horizontal state.

[0042] Considering that when the beam segments are assembled vertically, due to their large windward area, in addition to the influence of their own deadweight, the interference of wind load must also be considered. Therefore, this application provides a docking force transmission device 7 when the beam segments are assembled vertically to solve the problem of difficulty in vertically splicing the beam segments. Fig.12The butt force transmission device 7 of this embodiment includes force transmission connection plates arranged on both sides of the beam segment in the vertical direction. The force transmission connection plates are arranged at the joints of the upper and lower single-section beam segments. The two ends of the force transmission connection plates are respectively anchored to the surfaces of the upper and lower single-section beam segments, thereby improving the connection strength of the upper and lower single-section beam segments. In addition, since the height of the beam segment after vertical assembly is relatively high and the windward surface is relatively large, this embodiment arranges a steel pipe attachment 8 on the side of the vertically assembled beam segment close to the tower column, and uses the steel pipe attachment 8 to stably support the vertically assembled beam segment to prevent the vertically assembled beam segment from overturning under the action of wind.

[0043] Therefore, when the present application is vertically splicing and docking the beam segments, the single-section beam segment located on the ground sliding bracket is accurately slid into place and fixed as the base segment, and the docking force transmission device 7 on one side is installed on the base beam segment, and the docking force transmission device 7 on the other side is installed on the lifted beam segment to be spliced, and the beam segment to be assembled is lifted into the air by the vertical lifting station 4. The vertical lifting station 4 slowly lowers the beam segment to be spliced ​​and brings it close to the beam segment of the base segment, and accurately aligns it through the docking force transmission device 7, and then welds the upper and lower beam segments. In order to achieve stress-free welding, this embodiment needs to connect the docking force transmission device 7 to the beam segment of the base segment and the beam segment to be spliced ​​respectively before welding, and complete the splicing of the single-span side span beam segment according to this step.

[0044] The single-section beam segments are vertically spliced ​​to form the side span beam segments of the large segment. The vertical lifting station 4 is connected to the top of the side span beam segments of the large segment. In order to flip the side span beam segments of the large segment from a vertical state to a horizontal state, this embodiment adds a second vertical lifting station 4 on the basis of the original vertical lifting station 4 for lifting the beam segments to connect with the bottom end of the side span beam segments of the large segment. When flipping the side span beam segments of the large segment, start the second vertical lifting station 4 to slowly lift the bottom end of the side span beam segments of the large segment upwards, and at the same time start the hydraulic rod 53 on the rotating lifting lug 5 on the beam segment connected to the vertical lifting station 4 to make the lifting lug rotate synchronously and slowly until the first vertical lifting station 4 and the second vertical lifting station 4 are subjected to the same force and the lifting lugs of the span beam segment are located on the same horizontal plane to complete the flipping of the span beam segment.

[0045] (5) Please combine Figure 7 One end of the side span beam section is pulled to the top of the auxiliary pier by a winch 3 arranged on the pier column on the side of the auxiliary pier away from the tower column, and the other end of the side span beam section is connected by a sling.

[0046] An independent winch traction system is arranged on the pier column on the side of the auxiliary pier away from the tower column to provide horizontal force for swinging and traction to the beam section, and the maximum swinging angle of the beam section hoisting needs to be controlled within 20°, that is, after the beam section to be constructed is lifted into place by two vertical lifting stations 4, the winch 3 of the traction system cooperates with the tower crane and the hanging basket to pull the beam section until the end of the beam section is pulled to the top of the auxiliary pier for fixation, and a temporary sling 91 is arranged at the other end of the beam section.

[0047] (6) After repeating the above steps (1) to (4) to complete the assembly and direction adjustment of the next side span beam section, use the cable-mounted crane and vertical lifting station to lift the side span beam section and connect it with the installed side span beam section until the construction of the bridge cable-free area beam section is completed.

[0048] Please combine Figures 8 to 10 It is known that in this embodiment, 7 single-section beam segments are divided into two-span beam segments for construction. Therefore, after completing the construction of the first-span beam segment, the second-span beam segment needs to be constructed. The assembly steps of the second-span beam segment are the same as those of the first-span beam segment. However, considering that the distance between the transport ship 1 and the sliding bracket used for transportation and storage at the second-span beam end is relatively close, when hoisting the single-section beam segment, only one swing is required to transfer the single-section beam segment on the transport ship 1 to the sliding bracket.

[0049] According to the method of step (4), the remaining single-section beam segments are assembled to form a side span beam segment of the large segment, and the side span beam segment is flipped from a vertical state to a horizontal state, and then the side span beam segment is docked with the installed beam segment.

[0050] When the side span beam sections of the large section of this embodiment are butt-jointed, tie rods are needed to control the gap between the beam sections and the bottom plate to meet the requirements of the bridge line shape. The side span beam sections of the large section to be installed and the side span beam sections of the assumed large section mainly have vertical deviations and longitudinal deviations along the bridge direction. The vertical deviation can be integrated by temporary weighting and other measures, and the longitudinal deviation can be formed by pulling the erected beam section through traction equipment to form a gap, and then gradually adjusted. After the beam section is pre-assembled to the required accuracy, tie rods can be installed at the joints, and the tie rods can be used to adjust the gap of the beam section splicing joints. After the beam section is welded, the tie rods can be removed, and a permanent sling 92 is set at the end of the newly spliced ​​beam section away from the auxiliary pier. The permanent sling 92 is the first sling of the middle span.

[0051] Finally, the vertical lifting station 4 and the temporary sling 91 are dismantled to complete the installation of the beam section in the cable-free area of ​​the bridge.

[0052] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A swing-type vertical assembly construction method for side span beam sections, characterized in that: The following steps are involved: (1) A cable-mounted crane and a winch are used to lift the single-section beam section of the side span from the transport ship at the bridge site and swing it to the side span side of the tower. The cable-mounted crane is installed on the main cable on the side of the tower near the middle span, and the winch is installed on the pedestal on the side span side. (2) Using the vertical lifting station installed on the main cable near the side span of the tower column, the single-section beam section hoisted to the side span of the tower column is flipped from a horizontal state to a vertical state, and lowered to the sliding bracket set on the side span cap for beam storage; (3) Repeat the above steps (1) and (2) to hoist the single beam sections onto the sliding brackets one by one, and after the last beam section of the side span beam section of the same span is flipped from a horizontal state to a vertical state, the side span beam section is vertically assembled and installed; (4) The single-section beam segments falling on the sliding bracket are slid one by one to the bottom of the beam segment hoisted by the vertical lifting station, and the hoisted beam segments are lowered to the beam segments on the sliding bracket by the vertical lifting station to form a whole, and then the beam segments that are connected as a whole are lifted upward to a height position higher than the single-section beam segment until the vertical splicing of the single-span beam segment is completed, and then the side span beam segments in the vertical state are adjusted to the horizontal state by using two vertical lifting stations; (5) One end of the side span beam section is pulled to the top of the auxiliary pier by a winch installed on the pier column on the side away from the tower column, and the other end of the side span beam section is connected by a temporary sling; (6) After repeating the above steps (1) to (4) to complete the assembly and direction adjustment of the next side span beam section, use the cable-mounted crane and vertical lifting station to lift the side span beam section and connect it with the installed side span beam section until the construction of the bridge cable-free area beam section is completed.

2. The swing-shift vertical assembly construction method of the side span beam section according to claim 1 is characterized in that: In the above (1), after the single-section beam section is lifted upward from the transport ship by the cable-mounted crane to the position, the traction rope of the winch is connected to the single-section beam section, the winch is started, and the single-section beam section is pulled toward the side span. While the winch is pulling and collecting the rope, the cable-mounted crane's wire-retracting device cooperates to release the steel strand to complete the swinging construction of the single-section beam section.

3. The swing-shift vertical assembly construction method of side span beam segments according to claim 1 is characterized in that: The maximum swing angle of a single beam section hoisting shall not exceed 20°.

4. The swing-shift vertical assembly construction method of the side span beam section according to claim 3 is characterized in that: When the swing angle of a single beam section exceeds 20°, multiple swings are required.

5. The swing-shift vertical assembly construction method of side span beam segments according to claim 1 is characterized in that: When the single-section beam section in (2) is flipped from a horizontal state to a vertical state, rotating lifting ears are provided on both sides of the single-section beam section along the bridge direction, and the vertical lifting station flips the single-section beam section in the air by rotating the lifting ears.

6. The swing-shift vertical assembly construction method of side span beam segments according to claim 5 is characterized in that: The rotating lifting lug comprises a connecting seat, a connecting column and a hydraulic rod. The end of the connecting column is hinged to the connecting seat, the cylinder of the hydraulic rod is rotatably connected to the connecting column, and the extended end of the hydraulic rod piston rod is rotatably connected to the connecting seat. When the piston rod of the hydraulic rod extends out of the cylinder, the connecting seat is pushed to rotate relative to the connecting column. The connecting seat of the rotating lifting ear is connected to the single-section beam section, the steel strand of the vertical lifting station is connected to the connecting column of the rotating lifting ear, and the connecting seat is pushed and rotated by a hydraulic rod to drive the single-section beam section connected to the connecting seat to rotate.

7. The swing-shift vertical assembly construction method of side span beam segments according to claim 1 is characterized in that: The sliding support includes a sliding track and a beam section support frame. The sliding track is arranged along the bridge direction. A weight shifter is arranged at the bottom of the beam section support frame. The beam section support frame moves on the sliding track through the weight shifter to transfer and shift the beam section.

8. The swing-shift vertical assembly construction method of side span beam segments according to claim 7 is characterized in that: The beam section support frame includes a beam section sliding base support and an anti-overturning support. The beam section sliding base support is configured as a rectangular frame with a parallel link and a diagonal brace inside. The anti-overturning support includes a supporting steel pipe with one end connected to the beam section sliding base support and the other end connected to the upper ear plate of the beam section. A group of supporting steel pipes are respectively arranged on both sides of the beam section facade.

9. The swing-shift vertical assembly construction method of side span beam segments according to claim 1, characterized in that: During the vertical butt jointing process of the beam segments in (4), a butt joint force transmission device for connecting the upper and lower single beam segments is provided at the beam segment joint, and the butt joint force transmission device includes force transmission connection plates with two ends respectively connected to the upper and lower single beam segments; When vertically splicing and butting the beam segments, first slide the single-section beam segment on the ground sliding bracket into place and fix it as the base segment. At the same time, install the butt-jointing force transmission device on one side on the base segment, and install the butt-jointing force transmission device on the other side on the lifted beam segment to be spliced. The beam segment to be assembled is lifted into the air by a vertical lifting station, and the vertical lifting station lowers the beam segment to be spliced ​​and brings it closer to the beam segment of the base segment. It is precisely aligned through the butt-jointing force transmission device, and then the upper and lower beam segments are welded.

10. The swing-shift vertical assembly construction method of side span beam segments according to claim 1, characterized in that: When the side span beam segment includes multiple span beam segments, the step of transversely butting the side span beam segments with large sections includes: The beam section to be installed is laterally butted against the erected beam section, and the vertical coordination of the beam section to be installed and the erected beam section is adjusted by adjusting the closing posture through temporary weighting. The longitudinal deviation of the beam section to be installed and the erected beam section is adjusted by pulling the erected beam section with traction equipment. After the pre-assembly of the beam sections reaches the required accuracy, tie rods are installed at the joints, and the tie rods are used to adjust the gap of the transverse splicing joints of the beam sections.

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