Splicing system of side span steel box girder

Abstract

The utility model discloses a side span steel box girder splicing system which comprises a plurality of to-be-spliced steel box girder sections and a plurality of sliding supports arranged on the side span side of a tower column, and the sliding supports can slide towards the large mileage side under the action of external force to be away from the side span girder falling position or slide towards the small mileage side under the action of external force to be away from the side span girder falling position. The sliding support is provided with a containing groove used for containing vertically-distributed steel box girder sections. The cable crane and the vertical lifting station are arranged on the two sides of the tower column respectively, and the vertical lifting station is located above the side span beam falling position; and the cable loading crane and the vertical lifting station are used for being matched with each other to unload the vertical to-be-assembled steel box girder sections on the transport ship and then placing the steel box girder sections on the corresponding sliding brackets or hoisting the steel box girder sections above the side span girder falling positions. The problem that the suspension bridge side span steel box girder is difficult to assemble in a limited site plane is solved; and erecting of a high-altitude support can be avoided through vertical splicing, and the construction efficiency is high.

Description

Technical Field

[0001] The present application relates to the field of bridge technology, and in particular to an assembly system for side span steel box girders. Background Art

[0002] The installation of the steel box girder segments of the side span of a suspension bridge is usually carried out by erecting a high-position support at the side span to the designed height of the steel box girder segment. The steel box girder segment is lifted to the high-position support by a cable-mounted crane, and a sliding device is set on the support. The steel box girder segment slides to the designed position through the sliding device, and multiple steel box girder segments are assembled into a whole on the support.

[0003] The shortcomings of the prior art are:

[0004] ① The construction site requirements are high. The area for scaffolding usually needs to cover the design projection area of ​​the side span steel box girder segment. It is difficult to meet the site requirements for deep canyon areas in mountainous areas. For cross-sea suspension bridges, the side span steel beams are often located in shallows or water, making scaffolding erection difficult and the foundation treatment cost high.

[0005] ② High safety risk. The height of high-position supports is usually greater than 30m. During the erection and dismantling of the supports, many high-altitude lifting and welding operations are required. Especially during dismantling, after the steel box girder segments are installed, the top space is limited, and conventional lifting plans are difficult to implement.

[0006] ③ The investment in scaffolding is large and the construction cost is high. Taking the scaffolding of a steel box girder segment with a height of 50m as calculation, the investment in scaffolding for every 10m of average length is about 120t. The scaffolding requires a large amount of material. During the erection and dismantling process, multiple lifting equipment and scaffolding erection personnel are required. The material costs, machinery equipment costs, and labor costs are relatively high. Summary of the Invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an assembly system for vertically assembling steel box girder segments, the technical solutions adopted include:

[0008] An assembly system for a side span steel box girder, comprising:

[0009] Several steel box girder segments to be assembled,

[0010] A plurality of sliding brackets are arranged on the side span side of the tower column. The sliding brackets can slide towards the long mileage side to move away from the side span beam drop position under the action of external force, or slide towards the short mileage side to the side span beam drop position under the action of external force. The sliding brackets are provided with receiving grooves for accommodating vertically distributed steel box beam segments;

[0011] The cable-mounted crane and the vertical lifting station are respectively arranged on both sides of the tower column, and the vertical lifting station is located above the side span beam drop position; the cable-mounted crane and the vertical lifting station are used to cooperate in unloading the steel box girder segments to be assembled erected on the transport ship and place them on the corresponding sliding bracket or hoist them above the side span beam drop position.

[0012] An embodiment of the present invention adopts a technical solution to solve its technical problem: the sliding bracket includes a rectangular base support, and two diagonal braces are respectively provided on both sides of the upper end of the rectangular base support corresponding to the longitudinal bridge direction, and the two diagonal braces on the same side are laterally spaced and form the accommodating groove, and four weight shifters are provided at the lower end of the rectangular base support.

[0013] An embodiment of the present invention adopts a technical solution to solve its technical problem: the steel box girder is provided with connecting ears at the positions corresponding to the four diagonal braces, and pin holes are provided on the upper ends of the four diagonal braces and the connecting ears respectively, and the four diagonal braces and the corresponding connecting ears are connected by pin shafts.

[0014] An embodiment of the present invention adopts a technical solution to solve its technical problem: it also includes two longitudinal sliding rails and two transverse sliding rails, and the two longitudinal sliding rails are arranged with transverse intervals, and the two transverse sliding rails are installed with longitudinal intervals at one end of the longitudinal sliding rail away from the side span, and the sliding bracket can slide on the two longitudinal sliding rails and the two transverse sliding rails through a weight shifter.

[0015] An embodiment of the present invention solves the technical problem by adopting a technical solution as follows: corresponding marking scales are respectively provided on the side of the two longitudinal sliding tracks that are away from each other and on the side of the two transverse sliding tracks that are away from each other.

[0016] An embodiment of the present invention adopts a technical solution to solve its technical problem: it also includes a traction winch, the traction winch is arranged on the side span side of the tower column, and the two traction winches are respectively used to pull the two sides of the rectangular base.

[0017] A support member is provided on the side span side of each tower column, and the support member is used to support the steel box beam segment.

[0018] Beneficial effects of the utility model:

[0019] ① Solved the problem of difficult horizontal assembly of steel box girders of side spans of suspension bridges in limited space;

[0020] ② Vertical assembly can avoid the need to erect high-altitude scaffolding, improve construction efficiency, reduce safety risks, require less temporary materials on site, and achieve outstanding economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 Schematic diagram of steel box girder assembly in this application embodiment Figure 1 ;

[0023] Figure 2 Schematic diagram of steel box girder assembly in this application embodiment Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the steel box girder assembly in the embodiment of this application Figure 3 ;

[0025] Figure 4 Schematic diagram of steel box girder assembly in this application embodiment Figure 4 ;

[0026] Figure 5 Schematic diagram of steel box girder assembly in this application embodiment Figure 5 ;

[0027] Figure 6 Schematic diagram of steel box girder assembly in this application embodiment Figure 6 ;

[0028] Figure 7 Schematic diagram of steel box girder assembly in this application embodiment Figure 7 ;

[0029] Figure 8 Schematic diagram of steel box girder assembly in this application embodiment Figure 8 ;

[0030] Figure 9 Schematic diagram of steel box girder assembly in this application embodiment Figure 9 ;

[0031] Figure 10 Schematic diagram of steel box girder assembly in this application embodiment Figure 10

[0032] Figure 11 Schematic diagram of steel box girder assembly in this application embodiment Figure 10 one

[0033] Figure 12 This is a schematic diagram of the steel box girder assembly in the embodiment of this application Figure 10 two

[0034] Figure 13 This is a schematic diagram of the steel box girder assembly in the embodiment of this application Figure 10 three

[0035] Figure 14 Schematic diagram of steel box girder assembly in this application embodiment Figure 10 Four;

[0036] Figure 15 Schematic diagram of steel box girder assembly in this application embodiment Figure 10 five;

[0037] Figure 16 Schematic diagram of steel box girder assembly in this application embodiment Figure 10 six;

[0038] Figure 17 This is a structural diagram of the stiffening plate in an embodiment of the present application;

[0039] Figure 18 This is a schematic diagram of the installation of the guide member in the embodiment of the present application;

[0040] Figure 19 This is a schematic diagram of the installation of the support member in an embodiment of the present application. DETAILED DESCRIPTION

[0041] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0042] In the description of this utility model, "above," "below," and "within" are understood to be exclusive of the number indicated, while "above," "below," and "within" are understood to be inclusive of the number indicated. The use of "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly specifying the number or order of the technical features indicated.

[0043] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0044] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection; internal communication between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0045] The assembly system of the side span steel box girder in this embodiment includes:

[0046] Several steel box girder segments 10 to be assembled,

[0047] Several sliding brackets 3 are arranged on the side span side of the tower column 8. The sliding brackets 3 can slide towards the long mileage side to move away from the side span beam drop position under the action of external force, or slide towards the short mileage side to the side span beam drop position under the action of external force. The sliding brackets 3 are provided with receiving grooves for accommodating vertically distributed steel box beam segments 10;

[0048] The cable-mounted crane 1 and the vertical lifting station 2 are respectively arranged on both sides of the tower column 8, and the vertical lifting station 2 is located above the side span beam drop position; the cable-mounted crane 1 and the vertical lifting station 2 are used to cooperate in unloading the steel box girder segments 10 to be assembled erected on the transport ship and place them on the corresponding sliding bracket 3 or hoist them above the side span beam drop position.

[0049] The method for assembling the side span steel box girder using the above-mentioned side span steel box girder assembly system includes:

[0050] Step 1: transport N steel box girder segments 10 to an assembly site, where N is a positive integer and N≥2;

[0051] Step 2: Use the cable crane 1 in conjunction with the vertical lifting station 2 to sequentially lift the first steel box girder segment 101 to the N-1th steel box girder segment 10, and place each lifted steel box girder segment 10 on the sliding support 3. After each steel box girder segment 10 is placed on the sliding support 3, slide the steel box girder segment 10 toward the larger mileage side to reserve a storage position for subsequent beam segments.

[0052] Step 3: Use the cable crane 1 in conjunction with the vertical lifting station 2 to lift the Nth steel box girder segment 10 to the space above the side span beam drop position, slide the N-1th steel box girder segment 10 toward the smaller mileage side so that the Nth steel box girder segment 10 and the N-1th steel box girder segment 10 are aligned vertically, and the Nth steel box girder segment 10 falls on the N-1th steel box girder segment 10, and weld the N-1th steel box girder segment 10 and the Nth steel box girder segment 10 into a whole.

[0053] Step 4: Use the vertical lifting station 2 to lift the assembled steel box girder segment 10 so that at least space for the next section is left below it, slide the nearest steel box girder segment 10 toward the smaller mileage side until it is aligned with the assembled steel box girder segment 10, and place the assembled steel box girder segment 10 on the steel box girder segment 10 below it and weld it to the assembled steel box girder segment 10;

[0054] Step 5: Repeat step 4 until all the steel box girder segments 10 are welded into a whole.

[0055] With reference to the accompanying drawings, this embodiment takes the splicing of three steel box girder segments 10 as an example to specifically describe the method for assembling the steel box girder segments 10 in this application, including:

[0056] S1. The side span steel box girder segment 10 is erected in the factory and hoisted onto a transport ship. After being transported to the site by the transport ship, the cable-mounted crane 1 cooperates with the vertical lifting station 2 to lift and unload the ship, and hoist the single-segment steel box girder segment 10 onto the existing main tower construction platform;

[0057] S2. First, hoist the first steel box girder segment 101 to the side span and place it on the sliding support 3. Figure 1 and Figure 2 As shown;

[0058] Slide the first steel box girder segment 101 toward the larger mileage side to leave a position for the next segment to drop the beam, such as Figure 3 and Figure 4 As shown;

[0059] Then slide the first steel box beam segment 101 laterally to leave space for the beams of the two segments, as shown below: Figure 5 As shown;

[0060] S3. Hoist the second steel box girder segment 102 to the side span and lower it onto the sliding support 3 as follows. Figure 6 and Figure 7 As shown;

[0061] Slide the second steel box girder segment 102 toward the larger mileage side to leave room for the next beam segment, as shown below: Figure 8 and 9 As shown;

[0062] S4. Hoist the third steel box girder segment 10 to the side of the side span, and then hoist it to the top of the side span drop beam position. Figure 10 and 11 As shown;

[0063] like Figure 12 As shown, the second steel box girder segment 102 is slid toward the smaller mileage side to below the third steel box girder segment 10, and the third steel box girder segment 103 is dropped on top of the second steel box girder segment 10, and then the second steel box girder segment 10 and the third stage steel box girder segment 10 are welded into a whole;

[0064] like Figure 13 As shown, the welded second steel box girder segment 102 and the third steel box girder segment 103 are hoisted as a whole, leaving space below for assembling the first steel box girder segment 101;

[0065] like Figure 14As shown, the first segment steel box girder segment 10 is slid to the bottom of the second steel box girder segment 102 and the third steel box girder segment 103, and the second steel box girder segment 102 and the third steel box girder segment 103 fall on the first segment steel box girder segment 10, and the second steel box girder segment 102 and the third steel box girder segment 103 are welded into a whole to complete the vertical assembly of the three steel box girder segments 10.

[0066] like Figure 15 and Figure 16 As shown, in step 2, after each lifted steel box girder segment 10 is placed on the sliding bracket 3, an anti-overturning structure needs to be set on each sliding bracket 3. The sliding bracket 3 includes a rectangular base 31. Two diagonal braces 32 are provided on the upper ends of the rectangular base 31 on both sides corresponding to the longitudinal direction of the bridge, and the two diagonal braces 32 on the same side are spaced apart laterally. The four diagonal braces 32 constitute the anti-overturning structure. Specifically, the steel box girder segment 10 is provided with connecting ears 33 at the positions corresponding to the four diagonal braces 32. Pin holes are provided on the upper ends of the four diagonal braces 32 and on the connecting ears 33. The four diagonal braces 32 and the corresponding connecting ears 33 are connected by pins for easy assembly and disassembly.

[0067] The rectangular base support 31 is a rectangular frame composed of 9m wide and 12m long 2I56a steel. Two pairs of weight shifters, spaced 2.9m apart, are positioned underneath. 2I25a and 156a steel serve as the parallel link for the sliding base support. Two pairs of φ426×6 steel pipes serve as diagonal braces 32 to ensure stability during beam sliding. Four weight shifters 12 support the rectangular base support 31, enabling the sliding support 3 to slide.

[0068] In this application, a sliding track is set on the side span so that the sliding bracket 3 can slide stably on the sliding track. The sliding track in this embodiment includes two longitudinal sliding rails 4 and two transverse sliding rails 5, and the two longitudinal sliding rails 4 are set at a transverse interval. The two transverse sliding rails 5 are installed at a longitudinal interval at one end of the longitudinal sliding rail 4 away from the side span. The sliding bracket 3 can slide on the two longitudinal sliding rails 4 and the two transverse sliding rails 5 through the weight shifter 12.

[0069] During the transfer of steel main beam segments, side span sliding tracks are used to slide the beam segments individually to the base of the lifting points. Two longitudinal sliding tracks are installed, each 27 meters long and 12 meters apart. Two transverse sliding tracks are installed, each 54 meters long and 2.6 meters apart. The tracks are constructed of 32-inch channel steel and 2-cm steel plates. Strip foundations are installed beneath the tracks to ensure sufficient bearing capacity.

[0070] like Figure 17As shown, preferably, in step 2, after each lifted steel box girder segment 10 is placed on the sliding bracket 3, stiffening plates 6 are installed transversely at the two cantilever ends of the steel box girder segment 10, and the stiffening plates 6 correspond to the two sides of the longitudinal bridge direction of the rectangular base 31.

[0071] When the steel box girder segment 10 slides vertically, the gap between the diaphragm and the bottom is large, and the bending stiffness of this part of the steel box girder is low, making it prone to bending deformation. To address the problem of deformation of the top and bottom plates and U-ribs in the cavity during vertical sliding of the steel box girder segment 10, a longitudinal stiffener 6 of the steel box girder is welded at the sliding track using 2mm steel plate at the cantilever end, and stiffeners 6 are welded along the transverse section for reinforcement.

[0072] In step 2, after each lifted steel box girder segment 10 is placed on the sliding bracket 3, two traction winches 11 are used to pull the sliding bracket 3 to drive the steel box girder segment 10 to slide into place on the sliding track.

[0073] In order to facilitate the control of sliding speed and ensure the synchronization of the slides on both sides of the steel box girder segment during the traction process, it is necessary to set a small marking line every 10 cm and a large mark every 1 m on the side of the track beams on both sides in advance to mark the position. During the sliding process of the steel box girder, attention should be paid to controlling the lateral deviation on both sides to achieve dynamic correction.

[0074] The traction winch 11 is used to pull the sliding bracket 3 to drive the steel box girder segment to slide into place on the two longitudinal sliding tracks 4 and the two transverse sliding tracks 5. During the sliding process, a dedicated person should be arranged to observe the sliding synchronization of the rectangular base 31 to ensure that the position deviation is no more than 100mm; if the deviation value is abnormal, it should be stopped immediately for inspection. After finding out the cause, the traction speed of the traction winch 11 on both sides should be controlled to adjust the deviation value; traction can be continued only after the deviation is corrected.

[0075] like Figure 18 As shown, preferably, in step 3 and step 4, when the n-th steel box girder segment 10 is spliced, the n-th steel box girder segment 10 is slid to the side with less mileage to the bottom of the lifted steel box girder segment 10, and a plurality of spaced guide members 7 are installed on the side of the n-th steel box girder segment 10 away from the lifted steel box girder segment 10, and then a plurality of spaced guide members 7 are installed on the side of the lifted steel box girder segment 10 away from the n-th steel box girder segment 10, and then the steel box girder segment 10 is slowly lowered and brought close to the n-th steel box girder segment 10 and falls on the n-th steel box girder segment 10, where n is a positive integer and 2≤n≤N.

[0076] When the steel box girder segments 10 are erected and assembled, due to their large windward area, in addition to considering the deadweight of the steel box girder segments 10 themselves, the interference of wind loads must also be considered. In order to solve the problem of difficult beam segment docking at high altitude, a docking guide 7 is designed.

[0077] During vertical assembly, the steel box girder segment 10 on the sliding bracket 3 is accurately slid to the side span drop beam position and fixed in place as a foundation segment. A plurality of spaced guide members 7 are installed on the side of the steel box girder segment 10 away from the lifted steel box girder segment 10. Then, a plurality of spaced guide members 7 are installed on the side of the lifted steel box girder segment 10 away from the steel box girder segment 10 and then lifted into the air. The vertical lifting station 2 slowly lowers the lifted steel box girder segment 10 and moves it closer to the steel box girder segment 10 on the sliding bracket 3. Through precise alignment of the guide members 7, stress-free docking is achieved.

[0078] Since the steel box girder is high after vertical assembly and has a large windward area, its overall stability is poor. 2I56 steel is used as a support member 13 on the side span of the tower column to support the assembled steel box girder segment and increase the overall stability.

[0079] Considering the complicated processes of welding steel box girders and guide devices, a vertical ring welding platform for steel box girders should be designed at the welding point to ensure safety during welding operations.

[0080] Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are all within the scope defined by the claims of this application. Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications and substitutions are all within the scope defined by the claims of this application.

Claims

1. A side span steel box girder assembly system, characterized in that: include: Several steel box girder segments (10) to be assembled, A plurality of sliding brackets (3) are arranged on the side span side of the tower column (8), and the sliding brackets (3) can slide toward the long mileage side to move away from the side span beam drop position under the action of external force, or slide toward the short mileage side to the side span beam drop position under the action of external force. The sliding brackets (3) are provided with accommodating grooves for accommodating vertically distributed steel box beam segments (10); A cable-mounted crane (1) and a vertical lifting station (2) are respectively arranged on both sides of a tower column (8), and the vertical lifting station (2) is located above the side span beam drop position; the cable-mounted crane (1) and the vertical lifting station (2) are used to cooperate in unloading the steel box girder segments (10) to be assembled erected on the transport ship and place them on the corresponding sliding bracket (3) or hoist them above the side span beam drop position.

2. The side span steel box girder assembly system according to claim 1, characterized in that: The sliding bracket (3) includes a rectangular base bracket (31), and two diagonal braces (32) are respectively provided on both sides of the upper end of the rectangular base bracket (31) corresponding to the longitudinal bridge direction, and the two diagonal braces (32) on the same side are distributed at intervals in the transverse direction and form the accommodating groove. Four weight shifters (12) are provided at the lower end of the rectangular base bracket (31).

3. The side span steel box girder assembly system according to claim 2, characterized in that: The steel box beam is provided with connecting ears (33) at positions corresponding to the four diagonal braces (32), and pin holes are provided on the upper ends of the four diagonal braces (32) and the connecting ears, respectively. The four diagonal braces (32) and the corresponding connecting ears (33) are connected by pin shafts.

4. The side span steel box girder assembly system according to claim 2, characterized in that: The invention also includes two longitudinal sliding rails (4) and two transverse sliding rails (5), and the two longitudinal sliding rails (4) are arranged with a transverse interval, and the two transverse sliding rails (5) are installed with a longitudinal interval at one end of the longitudinal sliding rail (4) away from the side span, and the sliding bracket (3) can slide on the two longitudinal sliding rails (4) and the two transverse sliding rails (5) through a weight shifter (12).

5. The side span steel box girder assembly system according to claim 2, characterized in that: The sides of the two longitudinal sliding rails (4) that are separated from each other and the sides of the two transverse sliding rails (5) that are separated from each other are respectively provided with corresponding marking scales.

6. The side span steel box girder assembly system according to claim 2, characterized in that: It also includes a traction winch (11), which is arranged on the side span side of the tower column (8), and the two traction winches (11) are respectively used to pull the two sides of the rectangular base (31).

7. The side span steel box girder assembly system according to claim 1, characterized in that: A support member (13) is provided on the side span of each tower column (8), and the support member (13) is used to support the steel box beam segment (10).

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