A large-span steel pipe arch bridge closure device and a rapid closure method

Abstract

The present application relates to a large-span steel pipe arch bridge closure device and a rapid closure method. A large-span steel pipe arch bridge closure device comprises a clamp plate and a plurality of T-shaped connecting plates, all of which are used to be distributed along the circumference of the chord pipe at the closure of the arch bridge. The T-shaped connecting plate comprises a vertical plate and a horizontal plate. The vertical plate is arranged along the radial direction of the chord pipe in the height direction, and is arranged along the axial direction of the chord pipe in the length direction. The two ends of the vertical plate are used to connect two chord pipes that need to be closed. The clamp plate is used to clamp and connect on both sides of the splice plate at the bottom of the two chord pipes that need to be closed. The temporary connecting stiffness of the two chord pipes that need to be closed is increased by the longitudinal T-shaped connecting plate, solving the problem of insufficient stiffness before the closure opening is welded with a compensating steel pipe, and avoiding the buckling deformation of the connecting plate during closure. The rapid closure method for the large-span steel pipe arch bridge reasonably arranges the closure construction process, maximizes the efficiency of the closure construction, and further improves the closure accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of large-span arch bridge closure technology, in particular to a large-span steel pipe arch bridge closure device and a rapid closure method. BACKGROUND

[0002] The traditional steel pipe arch bridge is a steel pipe concrete arch bridge. Due to the large pipe opening, a longitudinal connecting plate is welded in the pipe for temporary locking during closure, and finally a repair steel pipe is welded. However, in practice, due to the inability to weld the repair steel pipe in time after closure, the closure opening stiffness is small, and the longitudinal connecting plate buckling deformation occurs. At the same time, due to the limited closure time, the problem cannot be solved by increasing the longitudinal connecting plate. SUMMARY

[0003] The present application aims at the problem that the existing large-span steel pipe arch bridge closure technology uses a longitudinal connecting plate for temporary locking, and the repair steel pipe cannot be welded in time after closure, resulting in small closure opening stiffness and the occurrence of longitudinal connecting plate buckling deformation, and provides a large-span steel pipe arch bridge closure device and a rapid closure method.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] A large-span steel pipe arch bridge closure device, comprising a clamp plate and a plurality of T-shaped connecting plates, all the T-shaped connecting plates are arranged along the circumference of the chord pipe at the closure of the arch bridge, the T-shaped connecting plate comprises a vertical plate and a horizontal plate, the vertical plate is arranged along the radial direction of the chord pipe in the height direction, the length direction of the vertical plate is arranged along the axial direction of the chord pipe, and the two ends of the vertical plate are connected to the two chord pipes to be closed.

[0006] In this scheme, the clamp plate is used to clamp and connect the two sides of the splice plate at the bottom of the two chord pipes to be closed. The clamp plate is a permanent structure for the closure of the large-span steel pipe arch bridge, and plays a role in strengthening the closure section. The longitudinal connecting plate of the prior art is changed into a longitudinal T-shaped connecting plate, which can increase the temporary connection stiffness of the two chord pipes to be closed, and solve the problem of insufficient stiffness before the repair steel pipe is welded at the closure opening.

[0007] Preferably, the vertical plate is provided with a clearance groove on the side close to the chord pipe, and the width of the clearance groove is greater than the length of the repair steel pipe between the two chord pipes to be closed, so as to facilitate the installation and welding of the repair steel pipe.

[0008] Preferably, the depth of the clearance groove is 30-50mm, which ensures the temporary connection stiffness enhancement of the T-shaped connecting plate to the two chord pipes to be closed, and facilitates the installation and welding of the repair steel pipe.

[0009] Preferably, one end of the clamping plate is bolted to one of the two chord pipes that need to be closed, and the other end is plug-welded to the other of the two chord pipes that need to be closed.

[0010] The plug welding of one end of the clamping plate avoids the axial spacing error when the two chord pipes are butted, ensures that the clamping plate can smoothly connect the bottom splice plates of the two chord pipes that need to be closed, makes the construction safer and more convenient, and guarantees the closure quality.

[0011] A large-span steel pipe arch bridge rapid closure method, before welding the repair steel pipe between the two chord pipes that need to be closed, first install the large-span steel pipe arch bridge closure device, and after the repair steel pipe is welded, remove all T-shaped connecting plates of the large-span steel pipe arch bridge closure device.

[0012] The large-span steel pipe arch bridge rapid closure method uses the large-span steel pipe arch bridge closure device to temporarily connect the two chord pipes that need to be closed, and the longitudinal T-shaped connecting plates can increase the temporary connection stiffness of the two chord pipes that need to be closed, solving the problem of insufficient stiffness before the closure opening is welded with the repair steel pipe, so that the large-span steel pipe arch bridge rapid closure can be smoothly and high-quality performed.

[0013] Preferably, the large-span steel pipe arch bridge rapid closure method includes the following construction steps:

[0014] S1, adjust the elevation and axis between the two chord pipes that need to be closed to the design requirements;

[0015] S2, weld one of the same ends of all T-shaped connecting plates to one of the two chord pipes that need to be closed, and connect one end of the clamping plate of the large-span steel pipe arch bridge closure device to the splice plate at the bottom of the chord pipe that has been connected with the T-shaped connecting plate through high-strength bolts, and the high-strength bolts are not tightened;

[0016] S3, weld the other same end of all T-shaped connecting plates to the other of the two chord pipes that need to be closed, tighten the high-strength bolts, and weld the other end of the clamping plate to the splice plate at the bottom of the other chord pipe;

[0017] S4, weld the repair steel pipe;

[0018] S5, remove all T-shaped connecting plates of the large-span steel pipe arch bridge closure device.

[0019] The method for quickly closing the large-span steel pipe arch bridge according to the application avoids the situation that time is wasted due to the positioning of the connecting plate during the instantaneous closing, and the effect after the temporary connection is completed is better. After the one end of the T-shaped connecting plate and the one end of the clamping plate are positioned and connected, the elevation and the axis between the two chord pipes that need to be closed can be detected. If it is found that the elevation and the axis between the two chord pipes that need to be closed do not meet the design requirements due to the influence of the ambient temperature, the elevation and the axis can be adjusted again, so as to guarantee the closing speed and the closing quality in the later stage.

[0020] Preferably, in step S3, the one end of the clamping plate that is not connected by the high-strength bolt is welded to the splice plate at the bottom of the corresponding chord pipe by plug welding, so as to avoid the influence of the axial spacing error of the two chord pipes during the butt joint on the subsequent closing.

[0021] Preferably, in step S4, the repair steel pipe is circumferentially divided into a plurality of repair segments, and the curvature between at least one pair of adjacent two T-shaped connecting plates or the curvature between the adjacent T-shaped connecting plates and the splice plate is greater than the curvature of all the repair segments of the repair steel pipe, so as to facilitate the placement of the repair segment into the specified position and make the welding of the repair steel pipe more convenient.

[0022] Preferably, the repair steel pipe is circumferentially and uniformly divided into a plurality of repair segments, and the curvature between the adjacent two T-shaped connecting plates located on both sides of the top of the chord pipe is greater than the curvature of the repair segment, so as to facilitate the placement and welding of the repair segment from the top, and the welding of the repair steel pipe is more convenient and the welding quality is better.

[0023] Preferably, when the large-span steel pipe arch bridge includes arch ribs, the pipe opening misalignment of the two chord pipes that need to be closed is adjusted by using the horizontal bridge direction adjuster and the vertical direction adjuster.

[0024] The arch rib includes an upper chord and a lower chord, and the upper chord and the lower chord each include two chord pipes. Straight web members are connected between the chord pipes of the upper chord and the lower chord corresponding to the sides of the arch bridge in the horizontal direction. Flat link rods are connected between the two chord pipes adjacent in the horizontal direction of the arch bridge.

[0025] The horizontal bridge direction adjuster includes two upper horizontal bridge direction adjusters and two lower horizontal bridge direction adjusters that are cross-connected. The upper horizontal bridge direction adjuster, the lower horizontal bridge direction adjuster and the vertical direction adjuster each include a steel wire rope and a hand-operated hoist. The upper horizontal bridge direction adjuster is connected to the upper end of the corresponding straight web member at both ends. The lower horizontal bridge direction adjuster is connected to the lower end of the corresponding straight web member at both ends. The vertical direction adjuster is connected between the corresponding flat link rods.

[0026] When the long-span steel pipe arch bridge includes arch ribs, both closure segments include four chord pipes, and through the above arrangement, the pipe edges of all chord pipes needing closure of both closure segments can be simultaneously and synchronously adjusted to the design requirements, the adjustment is more convenient, the adjustment efficiency is high, and the construction period can be shortened.

[0027] In summary, due to the adoption of the technical scheme, the present application has the following advantages:

[0028] 1. The long-span steel pipe arch bridge closure device can increase the temporary connection stiffness of the two chord pipes needing closure through the longitudinal T-shaped connecting plate, solve the problem of insufficient stiffness before the closure opening is welded with the repair pipe, and avoid the buckling deformation of the connecting plate during closure.

[0029] 2. The long-span steel pipe arch bridge closure device can make the installation and welding of the repair pipe more convenient and improve the welding quality of the repair pipe by setting the avoiding groove on the side of the vertical plate of the T-shaped connecting plate close to the chord pipe.

[0030] 3. The long-span steel pipe arch bridge rapid closure method can temporarily connect the two chord pipes needing closure by using the long-span steel pipe arch bridge closure device, the longitudinal T-shaped connecting plate can increase the temporary connection stiffness of the two chord pipes needing closure, solve the problem of insufficient stiffness before the closure opening is welded with the repair pipe, and make the rapid closure of the long-span steel pipe arch bridge be successfully and high-quality.

[0031] 4. The long-span steel pipe arch bridge rapid closure method can avoid the waste of time due to the positioning of the connecting plate during instantaneous closure by first positioning and connecting one end of the T-shaped connecting plate and one end of the clamping plate, and then positioning and connecting the other end of the T-shaped connecting plate and the other end of the clamping plate to form temporary connection, thereby making the effect after temporary connection better. After positioning and connecting one end of the T-shaped connecting plate and one end of the clamping plate, the elevation and axis between the two chord pipes needing closure can be detected, and if the elevation and axis between the two chord pipes needing closure do not meet the design requirements due to the influence of environmental temperature, the elevation and axis can be adjusted again to ensure the closure speed and quality.

[0032] 5. The long-span steel pipe arch bridge rapid closure method can make the welding of the repair pipe more convenient by setting the T-shaped connecting plate at the connection position of the chord pipe.

[0033] 6. The large-span steel pipe arch bridge fast closure method, when the large-span steel pipe arch bridge comprises arch ribs, can simultaneously adjust the pipe edges of all chord pipes that need to be closed of two closure sections to the design requirements, is more convenient to adjust, has high adjustment efficiency, and can shorten the construction period. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a use state schematic diagram of the large-span steel pipe arch bridge closure device of the present application;

[0035] Figure 2 is a sectional view schematic diagram of A-A in Figure 1

[0036] Figure 3 is a front view schematic diagram of the T-shaped connecting plate;

[0037] Figure 4 is a side view schematic diagram of the T-shaped connecting plate;

[0038] Figure 5 is a bottom view schematic diagram of the T-shaped connecting plate;

[0039] Figure 6 is a vertical plane schematic diagram of adjusting the pipe edge dislocation in the transverse bridge direction during closure;

[0040] Figure 7 is a sectional view schematic diagram of B in Figure 6

[0041] Figure 8 is a plane schematic diagram of adjusting the pipe edge dislocation in the transverse bridge direction during closure;

[0042] Figure 9 is a sectional view schematic diagram of C in Figure 8

[0043] Figure 10 is a vertical plane schematic diagram of adjusting the pipe edge dislocation in the vertical direction during closure;

[0044] Figure 11 is a sectional view schematic diagram of D in Figure 10

[0045] Figure 12 is a plane schematic diagram of adjusting the pipe edge dislocation in the vertical direction during closure;

[0046] Figure 13 is a sectional view schematic diagram of E in Figure 12

[0047] ​​​​​Icon: 1 - chord pipe; 11 - splice plate; 3 - clamp plate; 31 - bolt hole; 32 - plug welding hole; 2 - T-shaped connecting plate; 21 - horizontal plate; 22 - vertical plate; 23 - avoiding groove; 4 - repair steel pipe; 41 - repair segment; 5 - straight link; 6 - straight web; 71 - upper horizontal bridge adjuster; 72 - lower horizontal bridge adjuster; 8 - vertical adjuster; 9 - hand chain block. DETAILED DESCRIPTION

[0048] The application will be described in further detail below with reference to the drawings.

[0049] In order to make the purpose, technical solutions and advantages of the application more clear, the application will be described in further detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application.

[0050] Example 1

[0051] This example provides a closure device for a long-span steel pipe arch bridge, referring to Figures 1-5 , which comprises a clamp plate 3 and a plurality of T-shaped connecting plates 2, all the T-shaped connecting plates 2 are used to be distributed along the circumference of the chord pipe 1 at the closure of the arch bridge, the T-shaped connecting plate 2 comprises a vertical plate 22 and a horizontal plate 21, the vertical plate 22 is used to be arranged along the radial direction of the chord pipe 1 in the height direction, the length direction of the vertical plate 22 is used to be arranged along the axial direction of the chord pipe 1, and the two ends of the vertical plate 22 are used to connect the two chord pipes 1 that need to be closed, and the clamp plate 3 is used to be clamped on both sides of the splice plate 11 at the bottom of the two chord pipes 1 that need to be closed and connected.

[0052] As shown in Figure 1 , the middle of the two chord pipes 1 that need to be closed needs to be connected by a repair steel pipe 4, that is, the two ends of the repair steel pipe 4 need to be welded with the two chord pipes 1 that need to be closed respectively. The bottom of the two chord pipes 1 that need to be closed has a splice plate 11, the splice plate 11 is vertically arranged and the top surface is welded to the bottom of the chord pipe 1, and the splice plate 11 is already welded to the chord pipe 1 to form an integral body before hoisting the chord pipe 1 for closure. The splice plate 11 at the bottom of the left chord pipe 1 itself has a bolt hole, and the splice plate 11 at the bottom of the right chord pipe 1 is a steel plate without holes.

[0053] As shown in Figure 2 , the clamp plate 3 is located on both sides of the splice plate 11 and clamps the splice plate 11 at the bottom of the two chord pipes 1 that need to be closed. As shown in Figure 1As shown, the left end of the clamping plate 3 is provided with a bolt hole 31 corresponding to the bolt hole of the left splice plate 11, which can be quickly and stably connected by high-strength bolts; the right end of the clamping plate 3 is provided with a plug welding hole 32, which is drilled on the ground before hoisting the clamping plate 3, so as to avoid the axial spacing error when the two chord pipes 1 are butted, and the hole can be drilled according to the actual situation to ensure that the clamping plate 3 can smoothly connect the splice plates 11 at the bottom of the two chord pipes 1 to be closed, so that the construction is safer and more convenient, and the closing quality is guaranteed.

[0054] As shown in the figure, Figures 3-5 As shown, the T-shaped connecting plate 2 includes a vertical plate 22 and a horizontal plate 21, the vertical plate 22 is provided with an avoiding groove 23 near one side of the chord pipe 1, the width of the avoiding groove 23 is greater than the length of the repair steel pipe 4 between the two chord pipes 1 to be closed, and as shown in the figure, Figure 1 As shown, the avoiding groove 23 is arranged at the position corresponding to the repair steel pipe 4, and the avoiding groove 23 crosses the repair steel pipe 4, so as to facilitate the installation and welding of the repair steel pipe 4. In this embodiment, the depth of the avoiding groove 23 is 30mm-50mm, which can ensure that the temporary connection stiffness of the T-shaped connecting plate 2 to the two chord pipes 1 to be closed is enhanced, and the installation and welding of the repair steel pipe 4 are facilitated.

[0055] The large-span steel pipe arch bridge closing device provided in the embodiment is used for clamping and connecting on both sides of the splice plates 11 at the bottom of the two chord pipes 1 to be closed, and is a permanent structure of the large-span steel pipe arch bridge closing, which plays a role in strengthening the closing section. The longitudinal connecting plate in the prior art is changed into a longitudinal T-shaped connecting plate 2, which can increase the temporary connection stiffness of the two chord pipes 1 to be closed, and solve the problem of insufficient stiffness before the repair steel pipe 4 is welded at the closing opening.

[0056] Embodiment 2

[0057] The large-span steel pipe arch bridge closing method provided in the embodiment is used for temporarily connecting the two chord pipes 1 to be closed by using the large-span steel pipe arch bridge closing device, and the longitudinal T-shaped connecting plate 2 can increase the temporary connection stiffness of the two chord pipes 1 to be closed, so as to solve the problem of insufficient stiffness before the repair steel pipe 4 is welded at the closing opening, and make the large-span steel pipe arch bridge closing be carried out smoothly and with high quality.

[0058] The large-span steel pipe arch bridge closing method provided in the embodiment is used for temporarily connecting the two chord pipes 1 to be closed by using the large-span steel pipe arch bridge closing device, and the longitudinal T-shaped connecting plate 2 can increase the temporary connection stiffness of the two chord pipes 1 to be closed, so as to solve the problem of insufficient stiffness before the repair steel pipe 4 is welded at the closing opening, and make the large-span steel pipe arch bridge closing be carried out smoothly and with high quality.

[0059] Embodiment 3

[0060] The embodiment provides a quick closure method for a large-span steel pipe arch bridge, temporarily connects two chord pipes 1 needing to be closed by using the large-span steel pipe arch bridge closure device in the embodiment 1, and comprises the following construction steps:

[0061] S1, adjusting the elevation and axis between the two chord pipes 1 needing to be closed to design requirements;

[0062] S2, welding one same end of all T-shaped connecting plates 2 to one chord pipe 1 of the two chord pipes 1 needing to be closed, and connecting one end of a clamping plate 3 of the large-span steel pipe arch bridge closure device to a splicing plate 11 at the bottom of the chord pipe 1 having the T-shaped connecting plate 2 by a high-strength bolt, and the high-strength bolt is not tightened;

[0063] S3, welding the other same end of all T-shaped connecting plates 2 to the other chord pipe 1 of the two chord pipes 1 needing to be closed, tightening the high-strength bolt, and welding the other end of the clamping plate 3 to the splicing plate 11 at the bottom of the other chord pipe 1;

[0064] Wherein, before hoisting the clamping plate 3, a hole 32 is drilled and plugged on the ground on the end of the clamping plate 3 not connected by the high-strength bolt, and in the step S3, the clamping plate 3 is welded to the splicing plate 11 at the bottom of the corresponding chord pipe 1 by the plug welding mode, so that the axial spacing error when the two chord pipes 1 are butted is avoided to affect the subsequent closure.

[0065] S4, welding the repair steel pipe 4;

[0066] In the step S4, the repair steel pipe 4 is circumferentially divided into a plurality of repair segments 41, wherein the arc between at least one pair of adjacent two T-shaped connecting plates 2 or the arc between adjacent T-shaped connecting plates 2 and the splicing plate 11 is greater than the arc of all repair segments 41 of the repair steel pipe 4, so that the repair segment 41 is placed into the specified position, and the welding of the repair steel pipe 4 is more convenient. In a more preferred embodiment, the repair steel pipe 4 is circumferentially and uniformly divided into a plurality of repair segments 41, the arc between the two adjacent T-shaped connecting plates 2 located at the top of the chord pipe 1 on both sides is greater than the arc of the repair segment 41, the repair segment 41 is placed from the top and welded, the welding of the repair steel pipe 4 is more convenient, and the welding quality is better.

[0067] As Figure 2As shown, the steel pipe 4 is circumferentially divided into four repair segments 41, and the T-shaped connecting plate 2 is provided with five T-shaped connecting plates 2, and the clamping plate 3 is located at the bottom of the chord pipe 1, and two T-shaped connecting plates 2 are symmetrically arranged on the left and right of the central axis of the chord pipe 1, and the included angle is 60°, that is, they are located on the six equal points, and the remaining one T-shaped connecting plate 2 is located at the uppermost position, but deviates from the top of the chord pipe 1 by a certain angle to the right, so that the arc between the left uppermost T-shaped connecting plate 2 and the right uppermost T-shaped connecting plate 2 is greater than the arc of the repair segment 41, so that the repair segment 41 can be conveniently placed in the installation position from the top, and the welding operation is convenient; in addition, such arrangement can also ensure that the chord pipe 1 is circumferentially balanced to set the connecting plate, thereby ensuring the balance of the temporary connection stiffness, which is beneficial to the closure construction.

[0068] S5, remove all T-shaped connecting plates 2 of the large-span steel pipe arch bridge closure device.

[0069] The large-span steel pipe arch bridge rapid closure method described in the embodiment first positions and connects one end of the T-shaped connecting plate 2 and one end of the clamping plate 3 after adjusting the elevation and axis between the two chord pipes 1 to be closed to the design requirements, and then positions and connects the other end of the T-shaped connecting plate 2 and the other end of the clamping plate 3 to form a temporary connection, thereby avoiding the waste of time due to the positioning of the connecting plate during instantaneous closure, and thereby making the effect after the completion of the temporary connection better. After positioning and connecting one end of the T-shaped connecting plate 2 and one end of the clamping plate 3, the elevation and axis between the two chord pipes 1 to be closed can be detected, that is, between steps S2 and S3, if it is found that the elevation and axis between the two chord pipes 1 to be closed do not meet the design requirements due to the influence of environmental temperature, the elevation and axis can be adjusted again to ensure the closure speed and quality in the later stage.

[0070] Embodiment 4

[0071] The embodiment provides a large-span steel pipe arch bridge rapid closure method, which temporarily connects two chord pipes 1 to be closed by using the large-span steel pipe arch bridge closure device described in embodiment 1, and when the large-span steel pipe arch bridge includes an arch rib, the axis is mainly adjusted by the side cable of the previous segment, and the elevation is adjusted by the buckle cable.

[0072] As shown in Figures 6-13 , the pipe opening of the two chord pipes 1 to be closed is adjusted by using the transverse bridge adjuster and the vertical adjuster;

[0073] In the embodiment, as shown in Figure 6 and Figure 10 , the arch rib includes an upper chord and a lower chord, and the upper chord and the lower chord each include two chord pipes 1, as shown in Figure 7 , it is a perspective view, the up-down direction is the radial direction, and the straight web 6 is connected between the chord pipes 1 of the upper chord and the lower chord corresponding to the side of the arch bridge in the transverse direction; as shown inFigure 13 As shown, the two adjacent chord pipes 1 are connected by a cross link 5.

[0074] As shown, the two adjacent chord pipes 1 are connected by a cross link 5. Figures 6-13 As shown, the two adjacent chord pipes 1 are connected by a cross link 5. Figure 7 Figure 9 As shown, the transverse adjuster includes two upper transverse adjusters 71 and two lower transverse adjusters 72, the upper transverse adjusters 71 and the lower transverse adjusters 72 are arranged in cross, the upper transverse adjusters 71 and the lower transverse adjusters 72 each include a steel wire and a hand-operated hoist 9, the upper transverse adjusters 71 are connected to the upper ends of the corresponding straight web members 6, and the lower transverse adjusters 72 are connected to the lower ends of the corresponding straight web members 6. Figure 7 Figure 9 As shown, the upper transverse adjusters 71 are connected to the upper ends of the diagonal straight web members 6, and the lower transverse adjusters 72 are connected to the lower ends of the diagonal straight web members 6; and the hand-operated hoists 9 are arranged on the same side, which is convenient for adjustment.

[0075] In this embodiment, the vertical adjuster 8 also includes a steel wire and a hand-operated hoist 9, and the vertical adjuster 8 is connected between the corresponding cross links 5. Figure 13 As shown, two vertical adjusters 8 are arranged on both sides, the two vertical adjusters 8 are arranged in parallel, and the two ends of the vertical adjuster 8 are connected to the two diagonal cross links 5, and the hand-operated hoists 9 are arranged on the lower side, which is convenient for operation.

[0076] In this embodiment, the vertical adjuster 8, the upper transverse adjuster 71 and the lower transverse adjuster 72 are provided with hand-operated hoists 9, and the two ends of the hand-operated hoist 9 are connected to the steel wire, which is connected to the corresponding straight web member 6 or the corresponding cross link 5, and the connection is convenient and stable.

[0077] In this embodiment, through the above arrangement, after the elevation and axis between the two chord pipes 1 that need to be closed are adjusted to the design requirements, the pipe edges of all chord pipes 1 that need to be closed in the two closure sections are simultaneously adjusted to the design requirements, which is more convenient and efficient, and can shorten the construction period.

[0078] ​​Specifically, in step S1, after the arch rib is hoisted, the appropriate temperature is selected for closure, the axis is mainly adjusted by the side cable of the previous segment, the elevation between the two chord pipes 1 to be closed is adjusted by the buckle cable, and the elevation and axis between the two chord pipes 1 to be closed are basically up to the design requirements. Then, the hand-operated hoist 9 is used to adjust the arch rib in the transverse and vertical directions, that is, the pipe edge is adjusted; whether the pipe edge reaches the design requirements is measured by two rulers, one of which is arranged along the outer wall of the chord pipe 1 in the axial direction, and the other is arranged along the chord pipe 1 in the radial direction, so that the pipe edge position, that is, the pipe edge distance, is measured, which provides a favorable reference for adjusting the pipe edge to the design requirements.

[0079] S2, after the adjustment is completed, Figure 6 The one end of the longitudinal T-shaped connecting plate 2 is respectively welded on all the chord pipes 1 on the left side of the arch rib, and Figure 6 The one end of the bottom clamping plate 3 is respectively temporarily positioned by bolts on all the chord pipes 1 on the left side of the arch rib, and the bolts are not tightened, so that the time wasted due to the positioning of the connecting plate during the instantaneous closure is avoided.

[0080] After the one end of the T-shaped connecting plate 2 and the one end of the clamping plate 3 are respectively positioned and connected, the pipe edge misalignment between the two chord pipes 1 to be closed can be detected again, that is, between steps S2 and S3, if it is found that the pipe edge misalignment between the two chord pipes 1 to be closed does not meet the design requirements due to the influence of environmental temperature, the pipe edge misalignment can be adjusted again to ensure the closure speed and quality in the later stage.

[0081] S3, in the time period when the temperature is stable, Figure 6 The other end of the longitudinal T-shaped connecting plate 2 is respectively welded on all the chord pipes 1 on the right side of the arch rib, and Figure 6 The bolts of the bottom clamping plate 3 on all the chord pipes 1 on the left side of the arch rib are tightened, and Figure 6 The clamping plate 3 and the splicing plate 11 are connected by plug welding on all the chord pipes 1 on the right side of the arch rib, and the instantaneous closure of the closure opening is completed.

[0082] S4, then measure the length of the closure opening steel pipe 4, cut and weld the closure opening steel pipe 4 on site; the closure opening steel pipe 4 is divided into four closure segments 41, which are installed and welded piece by piece.

[0083] S5, all the T-shaped connecting plates 2 are removed, and the closure construction is completed.

[0084] The large-span steel pipe arch bridge fast closure method of the embodiment reasonably arranges the closure construction process, maximizes the efficiency of the closure construction, and further improves the closure precision; meanwhile, the longitudinal T-shaped connecting plate 2+the bottom clamping plate 3 instantaneous closure device is adopted, since the calculated span of the project concrete-filled steel tube arch bridge is 600 m, and the pipe opening outer diameter is only 900 mm, the overall rigidity of the bridge is smaller compared with the traditional steel pipe arch bridge, and the welding position is limited, therefore, the traditional longitudinal connecting plate is improved to the longitudinal T-shaped connecting plate 2, the closure opening rigidity is improved, and it is ensured that the instantaneous closure device will not be deformed greatly before the closure opening reinforcing steel pipe is welded, so as to achieve the purpose of reducing the influence of the construction operation on the linear precision, and ensure that the arch bridge linear before the closure is completed meets the design requirements.

[0085] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A closure device for a long-span steel tube arch bridge, characterized in that, The device comprises clamping plates (3) and a plurality of T-shaped connecting plates (2), all the T-shaped connecting plates (2) are arranged along the circumference of the chord tube (1) at the closure of the arch bridge, the arc between at least one pair of adjacent T-shaped connecting plates (2) or the arc between the adjacent T-shaped connecting plates (2) and the splicing plate (11) is greater than the arc of all the repair segments (41) of the repair steel tube (4) evenly divided along the circumference, the T-shaped connecting plate (2) comprises a vertical plate (22) and a horizontal plate (21), the vertical plate (22) is arranged along the radial direction of the chord tube (1) in the height direction, the vertical plate (22) is provided with a clearance groove (23) on the side close to the chord tube (1), the width of the clearance groove (23) is greater than the length of the repair steel tube (4) between the two chord tubes (1) to be closed, the depth of the clearance groove (23) is 30-50 mm, the vertical plate (22) is arranged along the axial direction of the chord tube (1) in the length direction, the two ends of the vertical plate (22) are connected to the two chord tubes (1) to be closed, and the horizontal plate (21) is connected to the side of the vertical plate (22) away from the chord tube (1); The clamping plate (3) is used for clamping and connecting on both sides of the splicing plate (11) at the bottom of the two chord tubes (1) to be closed, one end of the clamping plate (3) is bolted to one of the two chord tubes (1) to be closed, and the other end of the clamping plate (3) is plug-welded to the other chord tube (1) to be closed.

2. A method for quickly closing a large-span steel pipe arch bridge, characterized in that, Before the repair steel tube (4) is welded between the two chord tubes (1) to be closed, the large-span steel tube arch bridge closure device is installed first, and after the repair steel tube (4) is welded, all the T-shaped connecting plates (2) of the large-span steel tube arch bridge closure device are removed.

3. The method according to claim 2, wherein The device comprises the following construction steps: S1, adjusting the elevation and axis between the two chord tubes (1) to be closed to the design requirement; S2, welding one of the same ends of all the T-shaped connecting plates (2) to one of the two chord tubes (1) to be closed, and connecting one end of the clamping plate (3) of the large-span steel tube arch bridge closure device to the splicing plate (11) at the bottom of the chord tube (1) to which the T-shaped connecting plate (2) is connected through high-strength bolts, and the high-strength bolts are not tightened; S3, welding the other same end of all the T-shaped connecting plates (2) to the other chord tube (1) to be closed, tightening the high-strength bolts, and welding the other end of the clamping plate (3) to the splicing plate (11) at the bottom of the other chord tube (1); S4, welding the repair steel tube (4); S5, removing all the T-shaped connecting plates (2) of the large-span steel tube arch bridge closure device.

4. The method according to claim 3, wherein In step S3, the end of the clamping plate (3) not connected through the high-strength bolt is welded to the splicing plate (11) at the bottom of the corresponding chord tube (1) through plug welding.

5. The method according to claim 3, wherein The repair steel tube (4) is evenly divided into a plurality of repair segments (41) along the circumference, and the arc between only the adjacent two T-shaped connecting plates (2) located on both sides of the top of the chord tube (1) is greater than the arc of the repair segment (41).

6. The method according to any one of claims 2-5, wherein, When the large-span steel tube arch bridge comprises arch ribs, the horizontal bridge direction adjuster and the vertical direction adjuster are used to adjust the pipe opening misalignment of the two chord tubes (1) to be closed. The arch rib comprises upper chords and lower chords, each of the upper chords and the lower chords comprises two chord tubes (1), straight web members (6) are connected between the chord tubes (1) of the upper chords and the lower chords corresponding to the sides of the arch bridge in the transverse direction, and flat link rods (5) are connected between two adjacent chord tubes (1) in the transverse direction of the arch bridge; The transverse bridge adjuster comprises two upper transverse bridge adjusters (71) and two lower transverse bridge adjusters (72) which are arranged in a cross manner, the upper transverse bridge adjusters (71), the lower transverse bridge adjusters (72) and the vertical adjuster (8) each comprise a steel wire rope and a hand-operated hoist (9), the upper transverse bridge adjusters (71) are each connected to the upper ends of the corresponding straight web members (6) at both ends, the lower transverse bridge adjusters (72) are each connected to the lower ends of the corresponding straight web members (6) at both ends, and the vertical adjuster (8) is connected between the corresponding flat link rods (5).

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