Rotatable cantilever crane for erecting bridge sections and method for erecting steel box girder

Abstract

The invention discloses a rotatable cantilever crane for erecting bridge sections and a method for erecting a steel box girder. The rotatable cantilever crane for bridge segment erection comprises a main framework, a crane carriage, a rotating mechanism and a lifting appliance, the main framework comprises two longitudinal main beams, a front cross beam and a rear cross beam are connected between the two longitudinal main beams, and a middle stand column and a rear stand column are connected to the lower portions of the middles and the lower portions of the rear ends of the longitudinal main beams correspondingly; the lower end of the middle stand column and the lower end of the rear stand column are both fixedly connected with the bottom frame, the bottom frame is movably matched with the walking track, supporting jacks are arranged on the lower portion of the front end and the lower portion of the rear end of the bottom frame, and a first main inclined supporting rod and a second main inclined supporting rod are detachably connected between the longitudinal main beam and the bottom frame. The hoisting trolley is movably arranged between the two longitudinal main beams, the lifting appliances are connected to the lower portion of a winch pulley block of the hoisting trolley through rotating mechanisms, and leveling jacks are arranged on the lifting appliances.

Description

Technical Field

[0001] The invention relates to a rotatable cantilever crane for bridge segment erection, belonging to the technical field of bridge construction equipment. The invention also relates to a method for erecting a steel box girder by using the above-mentioned rotatable cantilever crane. Background Art

[0002] The main bridge of the Wuhai Yellow River Extra-large Bridge adopts a (80 + 80 + 310 + 80 + 80) m hybrid girder cable-stayed bridge, which is a double-tower and double-cable-plane steel box girder railway cable-stayed bridge. The main girder adopts a single-box five-room gem-shaped cross-section with an aerodynamic layout. The length of the middle steel box girder section is 390.0 m, and the lengths of the concrete box girder sections at both ends are both 121.2 m. A steel-concrete composite section is arranged between the steel box girder and the concrete girder. The steel box girder in the middle span needs to be hoisted and suspended and assembled. Due to the influence of the width on the hoisting of the steel box girder, the steel box girder cannot be directly hoisted and installed in place.

[0003] Traditional cantilever cranes generally adopt a rhombic frame structure, with a fixed lifting device at the top, a traveling device at the bottom, and a water tank counterweight at the rear to increase the anti-overturning stability of the structure. Such traditional cantilever cranes are generally applicable to the construction of the steel box girder floating transportation method. There is no lifting trolley that can move longitudinally and transversely at the top, and there are defects such as large limitations in use, relatively poor maneuverability adjustment ability, small application range, and complex installation and disassembly. Summary of the Invention

[0004] Aiming at the above-mentioned defects existing in the prior art, the invention provides a rotatable cantilever crane for bridge segment erection, which has strong adaptability and convenient construction. By using it, the problem that the steel box girder cannot be directly hoisted and installed in place due to the influence of the width of the steel box girder during the assembly of the steel box girder can be solved, and the installation and disassembly are convenient.

[0005] The present invention is realized through the following technical scheme: a rotatable cantilever crane for erecting bridge segments, characterized in that it comprises a main frame, a lifting trolley, a rotating mechanism, and a sling, wherein the main frame comprises two parallel longitudinal main beams, a front cross beam and a rear cross beam are respectively connected between the front ends and the rear ends of the two longitudinal main beams, a rear column is connected to the lower part of the rear end of the longitudinal main beam, a center column is connected to the lower middle part of the longitudinal main beam, the front end of the longitudinal main beam is cantilevered, the lower ends of the center column and the rear column are fixedly connected to the bottom frame, the bottom frame is movably matched with the running tracks arranged on both sides of the bottom, and the front end of the bottom frame is connected to the lower part of the rear end of the longitudinal main beam. Support jacks are provided at the front and rear ends of the lower parts, a first main diagonal brace is detachably connected between the middle part of the longitudinal main beam and the rear end of the bottom frame on the same side, a second main diagonal brace is detachably connected between the front part of the longitudinal main beam and the front end of the bottom frame on the same side, the lifting trolley is movably arranged between the two longitudinal main beams, the hoisting device is connected to the lower part of the winch pulley group of the lifting trolley through a rotating mechanism, the lifting device comprises an upper shoulder pole beam connected to the rotating mechanism and two lower shoulder pole beams hingedly connected to the two ends of the lower part of the upper shoulder pole beam, connecting ear plates are respectively provided at the bottoms of the two ends of the lower shoulder pole beams, and leveling jacks are provided on the upper shoulder pole beam and the lower shoulder pole beam.

[0006] In the present invention, the main frame as a whole can move along the running track, and the supporting jacks arranged at the bottom of the main frame are used for support. The hoisting trolley can move along the longitudinal main beam of the main frame. The sling connected to the lower part of the winch pulley group of the hoisting trolley can be connected to the lifting lug on the steel box beam segment through the connecting lug plate arranged at the bottom of the lower shoulder beam. The sling can drive the steel box beam segment to rotate through the rotating mechanism connected thereto. The leveling jack arranged on the sling is used to adjust the inclination angle of the steel box beam to facilitate the docking of the beam segments. When the steel box beam is assembled by the present invention, the steel box beam segment to be assembled can be lifted to the bridge deck by the beam lifting machine, and then transported to the cantilevered position of the cantilever crane by the beam transporting trolley, and then the steel box beam segment is rotated 90° by the rotating mechanism for assembly. The method of "transporting beams on beams" solves the problem that the steel box beam cannot be directly hoisted and installed in place due to the influence of the width of the steel box beam.

[0007] Furthermore, a plurality of connecting lugs are provided at the lower part of the upper shoulder pole beam, and the lower shoulder pole beam is connected to the upper shoulder pole beam through the connecting lugs at the lower part of the upper shoulder pole beam. By providing a plurality of connecting lugs at the lower part of the upper shoulder pole beam, the installation position of the lower shoulder pole beam can be adjusted, and the hoisting of beam sections at different center of gravity positions can be adapted.

[0008] Further, for the convenience of movement, a running jack is connected between the bottom frame and the running track. The running jack can be used to push the crane to move along the running track.

[0009] Furthermore, in order to improve the overall structural strength of the main frame, at least one secondary connecting rod is detachably connected between the longitudinal main beam and the first main diagonal brace rod and the second main diagonal brace rod on the same side.

[0010] Furthermore, in order to improve the overall structural strength of the main frame, diagonal braces are detachably connected between the longitudinal main beam and the front cross beam and the rear cross beam.

[0011] Furthermore, to ensure construction safety, guardrails are provided on the outer sides of the two longitudinal main beams.

[0012] The present invention also provides a method for erecting a steel box girder using the above-mentioned rotatable cantilever crane, which is characterized by comprising the following steps:

[0013] (1) Install the running track of the rotatable cantilever crane on the bridge deck;

[0014] (2) Install the rotatable cantilever crane on the running track and anchor it to the bridge deck;

[0015] (3) The steel box girder segment is lifted to the bridge deck by the beam lifting machine. The steel box girder segment is placed on the bridge deck with its transverse direction in the direction of the bridge. The steel box girder segment is transported to the rotatable cantilever crane by the beam transporting trolley. The lifting trolley of the rotatable cantilever crane moves to the rear end, and is connected to the steel box girder segment by the lifting device, and then lifted and moved forward. The steel box girder segment is moved to the cantilevered part of the main frame and then lowered to the set height. The rotating mechanism is started to rotate the steel box girder segment 90°.

[0016] (4) The steel box girder segment is rotated to the rear of the longitudinal bridge, and the position of the steel box girder segment is adjusted by the movement of the lifting trolley so that the steel box girder segment is close to the installed beam segment;

[0017] (5) The longitudinal slope and transverse level of the steel box girder are adjusted by the leveling jacks installed on the slings so that the longitudinal and transverse slopes of the steel box girder reach the design accuracy;

[0018] (6) Use a lifting trolley to move the steel box girder segment close to the installed beam segment and install it.

[0019] The beneficial effects of the present invention are as follows: the rotatable cantilever crane in the present invention can lift and transport the beams through its lifting trolley, and transport the steel box beam to the assembly position. The position of the steel box beam can be conveniently adjusted through the lifting trolley, which is convenient for assembling the steel box beam and can reduce the construction difficulty; through the specially designed lifting device, it can not only be conveniently connected to or disassembled with the steel box beam, but also the inclination angle of the steel box beam can be adjusted through the leveling jack arranged on the lifting device, which is convenient for connecting the beam sections, can greatly reduce the construction difficulty and improve the construction accuracy; the steel box beam can be conveniently driven to rotate through the rotating mechanism connected to the lifting device to realize the conversion between the transportation state and the connecting state of the steel box beam, which solves the problem that the width of the steel box beam exceeds the internal width of the cantilever crane and cannot be directly transported; the longitudinal main beam of the main frame of the present invention and the bottom frame and the longitudinal main beam and other components are all connected by detachable rods. This structural form not only has high structural strength and can effectively meet the structural strength requirements of the crane, but also is easy to install and disassemble, which can speed up the construction progress. Compared with the traditional cantilever crane, the rotatable cantilever crane of the present invention has good maneuverability and wide application range, and is more convenient to use for construction. The steel box girder erection method adopted by the present invention adopts the method of "transporting the girder on the beam" to effectively solve the problem that the steel box girder cannot be directly hoisted and installed in place due to the influence of the width of the steel box girder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the rotatable cantilever crane in the present invention;

[0021] Figure 2 yes Figure 1 Schematic diagram of the structure in the AA direction;

[0022] Figure 3 yes Figure 1 The schematic diagram of the structure in the BB direction;

[0023] Figure 4 yes Figure 1 The structural diagram of CC direction in FIG.

[0024] Figure 5 yes Figure 1 An enlarged schematic diagram of the lifting trolley part;

[0025] Figure 6 It is a schematic diagram of the connection structure between the rotating mechanism and the lifting device of the rotatable cantilever crane in the present invention;

[0026] Figure 7 It is a schematic diagram of the connection structure between the rotating shaft of the rotating mechanism and the winch pulley block in the present invention;

[0027] Figure 8 yes Figure 3 An enlarged schematic diagram of part D in FIG.

[0028] Fig. 9 yes Figure 4 An enlarged schematic diagram of part E in FIG.

[0029] Fig.10 It is a schematic diagram of the overall forward movement of the steel box girder segment during construction using a rotatable cantilever crane;

[0030] Fig.11 It is a schematic diagram of the overall rotation of the steel box girder segment during construction using a rotatable cantilever crane;

[0031] Fig.12 It is a schematic diagram of the overall positioning of the steel box girder segment during construction using a rotatable cantilever crane;

[0032] In the figure, 1, bottom frame, 2, running track, 3, completed beam section, 4, first main diagonal brace, 5, rear column, 6, secondary connecting rod between longitudinal main beam and first main diagonal brace, 7, guardrail, 8, longitudinal main beam, 9, secondary connecting rod between longitudinal main beam and second main diagonal brace, 10, lifting trolley, 11, winch pulley group, 12, rotating mechanism, 13, second leveling jack, 14, hoist, 15, second main diagonal brace, 16, middle column, 17, running jack, 18, steel box beam segment to be erected, 19, front cross beam, 20, rear cross beam, 21, diagonal brace between longitudinal main beam and rear cross beam, 22, diagonal brace between longitudinal main beam and front cross beam, 23, rear support jack, 24, transverse jack, 25, first leveling jack, 26, front support jack;

[0033] 10-1, trolley crossbeam, 10-2, winch, 10-3, wheel box, 10-4, winch frame, 10-5, winch wire rope;

[0034] 11-1, bottom plate of winch pulley block;

[0035] 12-1, rotating motor, 12-2, small gear, 12-3, large gear, 12-4, rotating shaft;

[0036] 14-1, upper shoulder pole beam, 14-2, lower shoulder pole beam, 14-3, connecting ear plate at the lower part of the upper shoulder pole beam, 14-4, connecting ear plate at the lower part of the lower shoulder pole beam. DETAILED DESCRIPTION

[0037] The present invention will be further described below by way of non-limiting embodiments and in conjunction with the accompanying drawings:

[0038] As shown in the attached drawings, a rotatable cantilever crane for erecting bridge segments includes a main frame, a hoisting trolley 10, a rotating mechanism 12, and a sling 14. The main frame includes a bottom frame 1, an upper frame, a middle column 5 connected between the bottom frame 1 and the upper frame, and a rear column 16; the bottom frame 1 includes longitudinal bottom beams on both sides and a transverse bottom beam connected to the front ends of the two longitudinal bottom beams; the upper frame includes two parallel longitudinal main beams 8, a front cross beam 19 is connected between the front ends of the two longitudinal main beams 8, a rear cross beam 20 is connected between the rear ends of the two longitudinal main beams 8, a diagonal brace 22 is detachably connected between the longitudinal main beam 8 and the front cross beam 19, and a diagonal brace 21 is detachably connected between the longitudinal main beam 8 and the rear cross beam 20; a rear column 5 is connected to the lower rear end of each longitudinal main beam 8, and a middle column 5 of each longitudinal main beam is connected to the rear end of each longitudinal main beam 8. A central column 16 is connected to the lower part of each part, the front end of the longitudinal main beam 8 is cantilevered, and the lower ends of the central column 16 and the rear column 5 are fixedly connected to the bottom frame 1; the first main diagonal brace 7 is detachably connected between the middle part of the longitudinal main beam 8 and the rear end of the bottom frame 1 on the same side, and the second main diagonal brace 15 is detachably connected between the front part of the longitudinal main beam 8 and the front end of the bottom frame 1 on the same side. In order to ensure the structural strength of the main frame, at least one secondary connecting rod 6 is detachably connected between the longitudinal main beam 8 and the first main diagonal brace 4 on the same side, and at least one secondary connecting rod 9 is detachably connected between the longitudinal main beam 8 and the second main diagonal brace 15 on the same side. The bottom frame 1 is movably matched with the running tracks 2 set on both sides of its bottom, and the bottom frame 1 can move along the running tracks 2 under the action of external force. In this embodiment, a running jack 17 is set between the bottom frame 1 and the running track 2, and the running jack 17 can push the crane as a whole to move. Front supporting jacks 26 are provided on both sides of the lower front end of the bottom frame 1, and rear supporting jacks 23 are provided on both sides of the lower rear end of the bottom frame 1. The front supporting jacks 26 and the rear supporting jacks 23 can support the crane. The trolley 10 is movably arranged between the two longitudinal main beams 8. The trolley 10 is a prior art. The trolley 10 mainly includes a trolley beam 10-1, a winch 10-2, and a winch frame 10-4. The winch frame 10-4 is installed on the upper part of the trolley beam 10-1, and the winch 10-2 is installed on the upper part of the winch frame 10-4. Wheel boxes 10-3 are arranged at the lower parts of both ends of the trolley beam 10-1. The two ends of the trolley beam 10-1 are respectively matched with the guide rails arranged on the tops of the two longitudinal main beams 8 through the wheel boxes 10-3 at the lower parts thereof. The trolley 10 can run along the guide rails at the tops of the longitudinal main beams 8 through the wheel boxes 10-3 at the lower parts of the trolley beam 10-1. In order to facilitate the adjustment of the position of the winch, a transverse jack 24 is also provided on the lifting trolley cross beam 10-1 and connected to the winch frame 10-4.The hoist 14 is connected to the lower part of the winch pulley group 11 of the lifting trolley 10 through the rotating mechanism 12. The hoist 14 includes an upper shoulder beam 14-1 and two lower shoulder beams 14-2 hingedly connected to the lower part of the upper shoulder beam 14-1. The middle part of the upper shoulder beam 14-1 is connected to the rotating mechanism 12, and the two lower shoulder beams 14-2 are respectively connected to the lower parts of the two ends of the upper shoulder beam 14-1. The two ends of the bottom of the lower shoulder beam 14-2 are respectively provided with connecting ear plates 14-4, and the connecting ear plates 14-4 are used to connect with the lifting ears set on the steel box beam to be erected. In order to adapt to the lifting of beam sections with different center of gravity positions, it is preferred to set a plurality of connecting ear plates 14-3 at the lower part of the upper shoulder beam 14-1, and the lower shoulder beam 14-2 is connected to the upper shoulder beam 14-1 through the connecting ear plates 14-3 at the lower part of the upper shoulder beam. According to the center of gravity of the beam section to be lifted, the connecting ear plates 14-3 at different positions can be selected for connection. In order to facilitate the adjustment of the inclination of the hoisted steel box beam and to facilitate the docking of the steel box beam, a first leveling jack 25 is provided on the upper shoulder beam 14-1, and a second leveling jack 13 is provided on the lower shoulder beam 14-2. One end of the first leveling jack 25 is connected to the upper shoulder beam 14-1, and the other end is connected to the connecting piece connected to the upper shoulder beam 14-1. One end of the second leveling jack 13 is connected to the lower shoulder beam 14-2, and the other end is connected to the upper shoulder beam 14-1. The inclination angle of the beam section can be adjusted by the first leveling jack 25 and the second leveling jack 13, and the inclination angle of the beam section can be adjusted by ±2%. The rotating mechanism 12 in the present invention is used to drive the sling to rotate. The rotating mechanism 12 can adopt any rotating structure in the prior art that can drive the sling to rotate. The rotating mechanism 12 in this embodiment adopts a gear transmission structure, which includes two rotating motors 12-1, two small gears 12-2, a large gear 12-3, and a rotating shaft 12-4. The rotating shaft 12-4 is rotatably connected to the lower part of the bottom plate 11-1 of the winch pulley group, and the large gear 12-3 is assembled on the rotating shaft 12-4. The two rotating motors 12-1 are symmetrically installed on both sides of the winch pulley group 11, and the two small gears 12-2 are respectively installed on the motor shafts of the two rotating motors 12-1. The two small gears 12-2 are both meshed with the large gear 12-3, and the lower end of the rotating shaft 12-4 is connected to the sling 14. The two rotating motors 12 - 1 drive the large gear 12 - 3 to rotate through the two small gears 12 - 2 , and then drive the hanger 14 to rotate 360 ​​degrees through the rotating shaft 12 - 4 .

[0039] To ensure construction safety, in the present invention, guardrails 7 are provided on the outer sides of the two longitudinal main beams 8 .

[0040] When the steel box girder is erected by using the above-mentioned rotatable cantilever crane, the steel box girder is hoisted and assembled in sections, which includes the following steps:

[0041] (1) Install the running track 2 of the rotatable cantilever crane on both sides of the bridge deck;

[0042] (2) Install the rotatable cantilever crane on the running track 2 and anchor it to the bridge deck;

[0043] ① Install the bottom frame 1 on the running track 2, and use the front support jack and the rear support jack at the front and rear ends of the bottom frame 1 to keep it balanced and stable;

[0044] ②Install the center column and rear column: Install the two center columns and two rear columns on the bottom frame 1 and tighten the bolts;

[0045] ③Install the longitudinal main beam: splice the two sections of the longitudinal main beam on one side into a whole beam on the ground, then lift it as a whole, connect it with the middle column and the rear column, and tighten the bolts;

[0046] ④Install the crossbeam: connect the front crossbeam and the rear crossbeam to the longitudinal main beams on both sides to form an overall frame, and tighten the bolts;

[0047] ⑤Install the main diagonal brace and auxiliary connecting rod;

[0048] ⑥ Install the lifting trolley: Assemble the lifting trolley frame into a whole, then lift it as a whole, put it on the track at the top of the longitudinal main beam, install the winch, and connect the rotating mechanism 12 and the lifting device 14;

[0049] (3) The steel box girder segment to be erected is lifted to the bridge deck by a beam lifting machine, and the steel box girder segment is placed on a beam transport trolley on the bridge deck with the transverse direction of the bridge in the direction of the bridge. The steel box girder segment is transported to the rotatable cantilever crane by the beam transport trolley. The lifting trolley 10 of the rotatable cantilever crane moves to the rear, and is connected to the steel box girder segment by a lifting device 14, and then lifted and moved forward. The steel box girder segment is moved to the cantilevered part of the main frame and then lowered to a set height. The rotating mechanism 12 is started to slowly rotate the steel box girder segment as a whole by 90°;

[0050] (4) The steel box girder segment is rotated to the rear of the longitudinal bridge, and the position of the steel box girder segment is adjusted by the movement of the lifting trolley 10 so that the steel box girder segment is close to the installed beam segment;

[0051] (5) The longitudinal slope and transverse level of the steel box girder are adjusted by the leveling jack provided on the hanger 14 so that the longitudinal and transverse slopes of the steel box girder reach the design accuracy;

[0052] (6) Move the steel box girder segment by the lifting trolley 10 so that it is close to the installed beam segment and put into position, install the matching bolts and tighten them, and complete the installation of the beam segment.

[0053] The other parts of this embodiment are all prior art and will not be described in detail here.

Claims

1. A rotatable cantilever crane for erecting bridge segments, characterized by: The main frame includes two parallel longitudinal main beams, the front and rear ends of the two longitudinal main beams are respectively connected with a front cross beam and a rear cross beam, the lower part of the rear end of the longitudinal main beam is connected with a rear column, the lower part of the middle of the longitudinal main beam is connected with a center column, the front end of the longitudinal main beam is cantilevered, the lower ends of the center column and the rear column are fixedly connected to the bottom frame, the bottom frame is movably matched with the running tracks arranged on both sides of the bottom, the lower part of the front end and the lower part of the rear end of the bottom frame are both provided with supporting jacks, the longitudinal main beam A first main diagonal brace is detachably connected between the middle part and the rear end of the bottom frame on the same side, a second main diagonal brace is detachably connected between the front part of the longitudinal main beam and the front end of the bottom frame on the same side, the lifting trolley is movably arranged between the two longitudinal main beams, and the hoisting device is connected to the lower part of the winch pulley group of the lifting trolley through a rotating mechanism. The hoisting device includes an upper shoulder pole beam connected to the rotating mechanism and two lower shoulder pole beams hingedly connected to the two ends of the lower part of the upper shoulder pole beam, connecting ear plates are respectively arranged at the bottoms of the two ends of the lower shoulder pole beams, and leveling jacks are arranged on the upper shoulder pole beam and the lower shoulder pole beam.

2. The rotatable cantilever crane for erecting bridge segments according to claim 1 is characterized in that: A plurality of connecting ear plates are arranged at the lower part of the upper shoulder pole beam, and the lower shoulder pole beam is connected with the upper shoulder pole beam through the connecting ear plates at the lower part of the upper shoulder pole beam.

3. The rotatable cantilever crane for erecting bridge segments according to claim 1 is characterized in that: A traveling jack is connected between the bottom frame and the traveling track.

4. The rotatable cantilever crane for erecting bridge segments according to claim 1, 2 or 3, characterized in that: At least one secondary connecting rod is detachably connected between the longitudinal main beam and the first main diagonal brace rod and the second main diagonal brace rod on the same side.

5. The rotatable cantilever crane for erecting bridge segments according to claim 4 is characterized in that: Diagonal braces are detachably connected between the longitudinal main beam and the front cross beam and the rear cross beam.

6. The rotatable cantilever crane for erecting bridge segments according to claim 1, 2 or 3, characterized in that: Guardrails are provided on the outside of the two longitudinal main beams.

7. A method for erecting a steel box girder using the rotatable cantilever crane according to any one of claims 1 to 6, characterized in that: The steps include: (1) Install the running track of the rotatable cantilever crane on the bridge deck; (2) Install the rotatable cantilever crane on the running track and anchor it to the bridge deck; (3) The steel box girder segment is lifted to the bridge deck by the beam lifting machine. The steel box girder segment is placed on the bridge deck with its transverse direction in the direction of the bridge. The steel box girder segment is transported to the rotatable cantilever crane by the beam transporting trolley. The lifting trolley of the rotatable cantilever crane moves to the rear end, and is connected to the steel box girder segment by the lifting device, and then lifted and moved forward. The steel box girder segment is moved to the cantilevered part of the main frame and then lowered to the set height. The rotating mechanism is started to rotate the steel box girder segment 90°. (4) The steel box girder segment is rotated to the rear of the longitudinal bridge, and the position of the steel box girder segment is adjusted by the movement of the lifting trolley so that the steel box girder segment is close to the installed beam segment; (5) The longitudinal slope and transverse level of the steel box girder are adjusted by the leveling jacks installed on the slings so that the longitudinal and transverse slopes of the steel box girder reach the design accuracy; (6) Use a lifting trolley to move the steel box girder segment close to the installed beam segment and install it.

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