Manufacturing method of super large eccentric half-width steel-concrete composite box girder

Abstract

The invention relates to a method for manufacturing an ultra-large eccentric half-width steel-concrete composite box girder with a length of 32.25m, a width of 17.8m and a weight of more than 539 tons. The method comprises the following steps: overall assembly of left and right eccentric half-width steel-concrete composite box girders; hoisting and assembling precast concrete bridge panels with ultra-long lifting frame hoists; transverse wet joint construction of half-width precast bridge panels; utilizing four beam transport flat cars in parallel to synchronously support and transport the left and right half-width steel-concrete composite box girders for overall delivery; utilizing an integrated support pier support tooling system to support eccentric and overweight half-width steel-concrete composite box girder segments; utilizing four beam transport flat cars in parallel to transport eccentric segments; utilizing rigid support piers to support and control deformation of half-width steel-concrete composite box girders during large-volume wet joint construction; utilizing four parallel beam transport flat cars and a support system to transport and support the half-width segments for subsequent sandblasting and painting construction; utilizing an integrated support pier support tooling system and a combined multi-faceted stool to support the segments to ensure stable support for eccentric segment transportation.

Description

Technical Field

[0001] The invention relates to a method for manufacturing an ultra-large eccentric half-width steel-concrete composite box girder with a length of 32.25m, a width of 17.8m and a weight exceeding 539 tons, and belongs to the field of large bridge manufacturing. Background Art

[0002] The super-large eccentric half-width steel-concrete composite box girder is a new type of structure, and there is no technical application for factory manufacturing at present. The super-large eccentric half-width steel-concrete composite beam has the characteristics of large structural dimensions, heavy segment mass, structural eccentricity and high structural dimension manufacturing precision. Its manufacturing mainly has the following manufacturing difficulties: First, the structural dimensions are too long, the mass is too heavy, the structure is eccentric, the segment manufacturing precision and the matching precision with the adjacent segments are high, and the precision control is the difficulty of manufacturing; second, the concrete prefabricated bridge deck is 30~50 tons. Due to the large span of the total assembly line, the lifting weight of a single hoisting crane cannot meet the lifting requirements. The hoisting, assembly and superposition control of the concrete prefabricated bridge deck are the difficulties of manufacturing; third, the structural dimensions are too long, the mass is too heavy, the structure is eccentric, and after the segment assembly is completed, how to produce the tire is the difficulty of manufacturing; fourth, the transportation and support of the eccentric half-width steel-concrete composite box girder after production are the difficulties in the manufacturing process. Fifth, during the wet joint casting construction process, ensuring that the box mouth size of the finished segment after casting remains consistent with the overall assembly is a difficulty in the manufacturing process; sixth, due to the extra-long size, overweight mass, and eccentric structure, during the segment loading and transportation, ensuring transportation safety and ensuring smooth lifting of the segment at the construction site is one of the difficulties that need to be considered in the manufacturing process. Summary of the invention

[0003] Design purpose: According to the manufacturing difficulties in the background technology, a manufacturing method for an ultra-large eccentric half-width steel-concrete composite box girder with a length of 32.25m, a width of 17.8m and a weight of more than 539 tons is designed.

[0004] Design scheme: In order to achieve the design purpose of the present invention. The present invention is aimed at a cable-stayed bridge with a central cable plane. The 0# steel-concrete composite box girder segment in the cable tower area adopts a half-eccentric steel-concrete composite beam segment. The super-large eccentric half-width steel-concrete composite box girder mentioned in the present invention is 32.25m long, 17.8m wide, and weighs more than 539 tons. Due to the eccentric, super-long, and super-heavy structure, the overall assembly accuracy of the segment, the bridge deck overlap accuracy, the assembly of the composite beam after assembly, the segment transportation, support, wet joint casting deformation control, and shipping and other factory manufacturing construction links are facing difficulties. In order to overcome the factory manufacturing of the super-large eccentric steel-concrete composite box girder and ensure the construction quality, original new manufacturing processes, support tooling, transportation methods and other construction technologies have been systematically developed.

[0005] (1) The super-large eccentric half-width steel-concrete composite beam is assembled and manufactured as a whole, which ensures the overall manufacturing accuracy while solving the problem of manufacturing super-large and super-heavy eccentric beam sections;

[0006] (2) An ultra-long tire-type frame hoist with a length of 11.07m and a width of 6.99m was developed. Its application can ensure that two overhead cranes can lift and install precast concrete bridge decks, solving the problem that a single overhead crane cannot meet the lifting load, and realizing the lifting and assembly of large and heavy precast concrete bridge decks;

[0007] (3) The integrated support pier support tooling system developed by the company can be used to support and transport the half-width eccentric steel-concrete composite box girder, which is convenient and fast;

[0008] (4) The overall manufacturing accuracy of the eccentric half-width steel-concrete composite box girder can be achieved through large-volume longitudinal wet joint casting deformation control measures such as rigid support;

[0009] (5) The support pier support fixture system and the combined multi-faceted support pier support segments are used to ensure the stability of the beam segment support during loading and transportation, avoid deformation that affects the quality of the bridge deck and the external dimensions of the segment, and ensure transportation safety.

[0010] That is, the key manufacturing technologies of the present invention for the super-large eccentric half-width steel-concrete composite box girder include: overall assembly of the left and right half-width steel-concrete composite box girders; lifting and assembling of precast concrete bridge decks with super-long lifting frame hoists; construction of transverse wet joints of bridge decks; utilizing four beam transport flat cars in parallel to synchronously support and transport the left and right half-width steel-concrete composite box girders out of the body as a whole; utilizing the developed integrated support pier bracket tooling system to support the eccentric overweight half-width steel-concrete composite box girder segments; similarly utilizing four beam transport flat cars in parallel to transport the eccentric segments; utilizing rigid support piers to support and control the deformation of the half-width steel-concrete composite box girder during the construction of large-volume wet joints; utilizing four parallel beam transport flat cars and a support system to transport and support the half-width segments for subsequent sandblasting, painting and other construction; utilizing the integrated support pier bracket tooling system and a combined multi-faceted stool to support the segments to ensure that the eccentric segments are transported and supported stably.

[0011] The method for manufacturing a super-large eccentric half-width steel-concrete composite box girder of the present invention comprises the following steps:

[0012] [1] Assembly of the bottom steel beam of the eccentric half-width steel-concrete composite box girder:

[0013] On the long-line method assembly frame, the bottom steel beams of the left and right eccentric half-width segments and the two full-width beam segments at each end in the length direction realize the long-line method assembly of six segments. The left and right eccentric half-width segments are temporarily connected into a whole by temporary matching parts to ensure the matching sizes between the half-width segments and the overall assembly accuracy of the half-width segments and the adjacent full-width segments in front and behind.

[0014] [2] Internal support of half-width steel-concrete composite box girder:

[0015] In order to increase the overall stiffness of the left and right half steel beams, before the super-heavy precast concrete bridge deck is superimposed and assembled with the half steel beam, rigid support is added inside the half steel-concrete composite beam to provide accuracy guarantee for the superposition of the bridge deck.

[0016] [3] Application of extra-long lifting frame sling:

[0017] According to the extra-long lifting frame hoist described in [2] of claim 2, the extra-long lifting frame hoist comprises a frame main beam, the upper portion of the frame main beam is provided with a lifting lug for connecting the lifting wire ropes of two cranes, and the lower portion of the frame main beam is provided with a lifting lug for connecting the lifting wire ropes of the prefabricated bridge deck, the position of the lifting lug is ensured to be directly above the lifting point of the prefabricated bridge deck, and by adjusting the length of the wire ropes at the lifting points on both sides of the transverse bridge, the aerial posture of the bridge deck during lifting is consistent with the i% transverse slope of the bridge deck, thereby ensuring that the bridge deck is subjected to safe and reliable force.

[0018] [4] Assembly and welding of prefabricated bridge deck and steel beam:

[0019] On the measuring towers on both sides of the general assembly line, with the baseline of steel beams and bridge decks as the reference, the position of the prefabricated bridge deck is monitored and measured by the total station, and auxiliary adjustments such as frame hangers and jacks are used to ensure the precise matching and positioning with the steel beams. After ensuring the assembly accuracy, the embedded steel components of the bridge deck are welded to the partitions and flange plates of the steel beams to make them a whole.

[0020] [5] Construction of transverse wet joints of half-width precast bridge deck:

[0021] The transverse wet joints between the welded bridge decks are filled with steel bars, the spliced ​​plates are bolted, and the transverse wet joints are cast to connect the prefabricated bridge decks into a whole.

[0022] [6] Temporary connection of the left and right half steel-concrete composite box girders and overall removal:

[0023]

[61] According to [3] in claim 2, temporary connecting plates are welded at the top flange plate butt joints, the partition plate butt joints, and the bottom plate butt joints in the middle of the left and right half steel-concrete composite beams to temporarily connect the left and right half eccentric beam sections into a whole.

[0024]

[62] Remove the movable beam above the beam transport channel of the assembly frame, and use four beam transport flat cars with a capacity of more than 300 tons in parallel, with two beam transport cars in front and behind each lane. The four cars support the beam section at the same time and move synchronously to transport the beam section out of the frame to ensure that the four cars are evenly stressed and support stable.

[0025] [7] Support and transportation of half-eccentric steel-concrete composite box girder:

[0026]

[71] According to [7] and [8] in claim 2, an integrated support pier bracket fixture system is developed based on the center of gravity position of the eccentric half-width steel-concrete composite beam section. The integrated support pier bracket fixture system includes a support frame connected to the inclined bottom plate of the half-width steel-concrete composite beam, and a steel support pier connected to the flat bottom plate. Each support frame spans two or three cross partitions, and four or six steel support piers are bolted and integrated directly below the box beam partition. The gap between the bottom adjustment plate of the support frame and the top plate of the steel support pier is controlled by adjusting the bolted bolts, and the height of the support beam section is adjusted by adding an adjustment pad, so as to ensure that each support point is evenly stressed during the support process.

[0027]

[72] After the half-width eccentric steel-concrete composite box girder section is produced, the developed integrated support pier support tooling system is first used to support the temporarily connected left and right half-width steel-concrete composite box girder sections. After ensuring that the support points are evenly stressed, the temporary matching parts of the top plate, bottom plate, and partition plate in the middle of the left and right half-width steel-concrete composite beam sections and the temporary reinforcement plates are removed to separate the left and right eccentric half-width steel-concrete composite box girder.

[0028]

[73] Four beam transport flatbed trucks with a capacity of more than 200 tons are connected in parallel, with two beam transport trucks at the front and rear of each lane. The four trucks support the beam section at the same time and move synchronously to transport the half-width beam section, ensuring that the four trucks are evenly stressed and support stable. The support frame together with the integrated support piers are transported together with the beam.

[0029] [8] Deformation control of large longitudinal wet joints during casting of half-width steel-concrete composite box girder:

[0030]

[81] According to [9] in claim 2, in order to achieve deformation control during the pouring of large-scale longitudinal wet joints of steel-concrete composite beam segments, before the wet joint pouring, a rigid support pier of a steel-concrete structure is added on the basis of the support pier bracket tooling system. The rigid support pier is supported at the side web position with relatively weak rigidity, and the support point is supported at each cantilever partition and the beam end position on both sides of the beam segment. The adjustment pad is used to support and level the segment to ensure that the top surface elevation of the segment is level, and that each point is evenly stressed, so that the cross-sectional dimensions of the segment are consistent with the dimensions during the overall assembly acceptance.

[0031]

[82] Rigid support formwork is used and pre-stressed to eliminate inelastic deformation. The elastic deformation compensation of the formwork is corrected according to the pre-stressing elastic deformation. Finally, wet joint concrete is poured to complete the wet joint pouring construction of the half-width steel-concrete composite box girder.

[0032] [9] Transportation and support for subsequent construction of half-width steel-concrete composite box girder segments:

[0033] According to

[10] in claim 2, after the wet joint curing strength reaches the required level, four parallel beam transport flat cars and a supporting pier support tooling system are used to transport and support the half-width segment for subsequent sandblasting, painting and other construction.

[0034]

[10] Sectional Shipment:

[0035] According to claim 2

[11] , the support pier support fixture system and the combined multi-faceted support pier support segment are used to ensure the stability of the beam segment support during the ship loading and transportation process, and to ensure that the beam segment does not deform to affect the quality of the bridge deck and the overall size of the segment. The combined multi-faceted support pier is composed of a plurality of multi-faceted support piers, which are connected into a whole by bolting and supported at the side web bulkhead position.

[0036]

[11] Dismantling and hoisting of the integrated support pier support tooling system:

[0037] Before hoisting the segment at the construction site, remove the connecting welds between the supporting frame of the supporting pier bracket tooling system at the inclined bottom plate and the inclined bottom plate of the half-width steel-concrete composite beam segment, and remove the connecting parts between the supporting pier and the bottom plate at the flat bottom plate to ensure that it is separated from the inclined bottom plate and the bottom plate. At this time, the eccentric beam segment is supported by the combined multi-faceted supporting piers and the supporting piers at the flat bottom plate position to ensure smooth erection and installation of the segment.

[0038] Technical solution 1: A method for manufacturing an extra-large eccentric half-width steel-concrete composite box girder, comprising the following steps: overall assembly of left and right eccentric half-width steel-concrete composite box girders; hoisting and assembling precast concrete bridge decks with extra-long lifting frame hoists; transverse wet joint construction of half-width precast bridge decks; utilizing four beam transport flat cars in parallel to synchronously support and transport the left and right half-width steel-concrete composite box girders for overall delivery; utilizing an integrated support pier support fixture system to support eccentric and overweight half-width steel-concrete composite box girder segments; utilizing four beam transport flat cars in parallel to transport eccentric segments; utilizing rigid support piers to support and control deformation during construction of large-volume wet joints of half-width steel-concrete composite box girders; utilizing four parallel beam transport flat cars and support systems to transport and support half-width segments for subsequent sandblasting and painting construction; utilizing an integrated support pier support fixture system and a combined multi-faceted support pier to regularly support the segments to ensure that the eccentric segments are transported and supported stably.

[0039] Technical Solution 2: An eccentric half-width steel-concrete composite box girder bottom steel beam assembly structure. On the long-line assembly frame, the left and right eccentric half-width segment bottom steel beams and two full-width beam segments at each end of their length direction are assembled together to realize the six-segment long-line assembly. The left and right eccentric half-width segments are temporarily connected into a whole by temporary matching parts to ensure the matching sizes between the half-width segments and the overall assembly accuracy of the half-width segments and the full-width segments adjacent to the front and rear.

[0040] Compared with the background technology, the present invention has the following advantages: first, the super-large eccentric half-width steel-concrete composite beam is assembled as a whole, and the bridge deck superposition accuracy is realized and controlled by using the developed frame-type hanger and the like; second, the left and right eccentric half-width steel-concrete composite beams are temporarily consolidated and integrally produced by using four parallel beam transport flat cars; third, the eccentric steel-concrete composite beam sections are supported by the developed integrated support pier bracket tooling system; fourth, the super-large eccentric half-width steel-concrete composite beams are transported by using four parallel beam transport flat cars; fifth, the rigid support piers are used to support and control the deformation of the half-width steel-concrete composite box beam during the construction of large-volume wet joints; sixth, the integrated support pier bracket tooling system and the combined multi-faceted support piers are used to support the segments, so as to ensure the stable support during the transportation of the eccentric segments, and ensure the safety of the construction site and the smooth installation and erection;

[0041] . BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall assembly of temporary connection and support of the left and right half steel-concrete composite beams.

[0043] Figure 2 yes Figure 1 A simplified schematic diagram of .

[0044] Figure 3 This is a schematic diagram of four beam transport vehicles being connected in parallel and moving out as a whole.

[0045] Figure 4 yes Figure 3 Schematic diagram from top view.

[0046] Figure 5 It is a schematic diagram of the cross section of a half-eccentric steel-concrete composite beam.

[0047] Figure 6 It is a schematic diagram of the cross section of the other partition positions of the half-eccentric steel-concrete composite beam.

[0048] Figure 7 This is a top view schematic diagram of a half-eccentric steel-concrete composite beam.

[0049] Figure 8 yes Figure 7 A simplified schematic diagram of .

[0050] Fig. 9 It is a schematic diagram of the structure and use of frame-type spreader.

[0051] Fig.10 yes Fig. 9 Schematic side view.

[0052] Fig.11 yes Fig. 9 Schematic diagram of the AA section.

[0053] Fig.12 yes Fig. 9Schematic diagram of the cross-section of the middle BB part.

[0054] Fig.13 This is a schematic diagram of the total spelling of 6 segments matched continuously.

[0055] Fig.14 It is a schematic diagram of the transverse wet joint connection between bridge decks.

[0056] Fig.15 It is a schematic diagram of the integrated support pier support tooling system and a schematic diagram of support transportation.

[0057] Fig.16 yes Fig.15 Schematic diagram from top view.

[0058] Fig.17 It is a schematic diagram of wet joint construction support.

[0059] Fig.18 yes Fig.17 Schematic diagram from top view.

[0060] Fig.19 It is a schematic diagram of support for shipping.

[0061] Fig. 20 yes Fig.19 Schematic diagram from top view. DETAILED DESCRIPTION

[0062] The following is combined with Figures 1 to 20 The present invention is further described.

[0063] [1] Assembly of the bottom steel beam of the eccentric half-width steel-concrete composite box girder:

[0064] On the long-line method assembly frame 1, the bottom steel beam 21 of the left and right eccentric half-width segments 2 and two full-width beam segments 3 at each end in the length direction realize the long-line method assembly of six segments. The left and right eccentric half-width segments are temporarily connected into a whole by temporary matching parts 4 to ensure the matching sizes between the half-width segments and the overall assembly accuracy of the half-width segments and the full-width segments 3 adjacent to the front and rear.

[0065] [2] In order to increase the overall stiffness of the left and right half steel beams, before the super-heavy precast concrete bridge deck 22 is superimposed and assembled with the half steel beam 21, a rigid support 5 is added inside the half steel-concrete composite beam to provide accuracy guarantee for the superposition of the bridge deck.

[0066] The process of assembling and welding precast concrete bridge decks into a whole by embedding steel components and steel beams is called composite assembly.

[0067] [3] is an extra-long lifting frame hoist 6 according to [2] in claim 2, the extra-long lifting frame hoist comprises a frame main beam 61, the upper portion of the frame main beam 61 is provided with a lifting lug 62 for connecting the lifting wire ropes of two cranes, the lower portion of the frame main beam 61 is provided with a lifting lug 63 for connecting the lifting wire ropes of the prefabricated bridge deck 22, the position of the lifting lug 62 is ensured to be located directly above the lifting point of the prefabricated bridge deck 22, and by adjusting the length of the wire ropes 64 at the lifting points on both sides of the transverse bridge, the aerial posture of the bridge deck during lifting is achieved to be consistent with the 2% transverse slope of the bridge deck, thereby ensuring that the bridge deck is subjected to safe and reliable force.

[0068] [4] On the measuring towers on both sides of the main assembly line, the steel beam and bridge deck baseline are used as the reference, and the position of the prefabricated bridge deck is adjusted by monitoring and measuring using a total station. The frame hanger 6 and jacks are used for auxiliary adjustment to ensure the accurate matching and positioning with the steel beam. After the assembly accuracy is ensured, the embedded steel components of the bridge deck are welded to the partitions and flange plates of the steel beam to make them a whole.

[0069] [5] The transverse wet joints between the welded bridge decks are filled with steel bars 231 and the splicing plates 232 are bolted together, and the transverse wet joints 23 are cast to connect the prefabricated bridge decks into a whole.

[0070] [6] According to [3] in claim 2, temporary connecting plates 7 are welded at the top flange plate butt joint 2111, the partition plate butt joint 2131, and the bottom plate butt joint 2121 in the middle of the left and right half steel-concrete composite beams to temporarily connect the left and right half eccentric beam sections 2 into a whole.

[0071] [7] Remove the movable beam above the beam transport channel in the main assembly frame 1, and use four beam transport flat cars 8 with a capacity of more than 300 tons in parallel, with two beam transport cars in front and behind each lane. The four cars support the beam section at the same time and move synchronously to transport the beam section out of the frame to ensure that the four cars are evenly stressed and support stable.

[0072] [8] According to [7] and [8] in claim 2, an integrated support pier bracket fixture system 9 is developed based on the center of gravity position of the eccentric half-width steel-concrete composite beam section 2. The integrated support pier bracket fixture system 9 includes a support frame 91 intermittently welded to the inclined bottom plate of the half-width steel-concrete composite beam 2, and a steel support pier 92 connected to the flat bottom plate. Each support frame 91 spans two or three cross partitions, and four or six steel support piers 92 are bolted and integrated just below the box beam partition. The gap between the bottom adjustment plate of the support frame 91 and the top plate of the steel support pier 92 is controlled by adjusting the bolted bolts, and the height of the support beam section is adjusted by adding an adjustment pad 93, so as to ensure that each support point is evenly stressed during the support process.

[0073] [9] After the half-width eccentric steel-concrete composite box girder section is produced, the developed integrated support pier support fixture system 9 is first used to support the temporarily connected left and right half-width steel-concrete composite box girder segments 2. After ensuring that the support points are evenly stressed, the middle flange plates, bottom plates, temporary matching parts 4 of the partitions and temporary reinforcement plates 7 of the left and right half-width steel-concrete composite box girder segments 2 are removed to separate the left and right eccentric half-width steel-concrete composite box girder.

[0074]

[10] Four beam transport flat cars 8 with a capacity of more than 200 tons are connected in parallel, with two beam transport cars in front and behind each lane on each side. The four cars simultaneously lift the height of the support beam section to ensure that the half-width beam section 2 is transported synchronously after the support pier is off the ground, ensuring that the four cars are evenly stressed and support is stable. The support frame 91 and the integrated support pier 92 are transported together with the beam.

[0075]

[11] In order to control the deformation of the large-volume longitudinal wet joint 24 of the steel-concrete composite beam segment 2 during casting, before casting the wet joint, a rigid support pier 10 of the steel-concrete structure is added on the basis of the support pier bracket tooling system 9. The rigid support pier 10 is supported at the side web position with relatively weak rigidity. The support points are supported at each cantilever partition and the beam ends on both sides of the beam segment 2. The adjustment pads are used to support and level the segment to ensure that the top surface elevation of the segment is level, and that each point is evenly stressed, so that the cross-sectional dimensions of the segment are consistent with the dimensions during the overall assembly acceptance.

[0076]

[12] A rigid support formwork is used and pre-stressed to eliminate inelastic deformation. The formwork elastic deformation compensation is corrected according to the pre-stressing elastic deformation. Finally, wet joint concrete 24 is poured to complete the wet joint pouring construction of the half-width steel-concrete composite box girder.

[0077]

[13] After the wet joint curing strength reaches the required level, four parallel beam transport flat cars 8 and the support pier bracket tooling system 9 are used to transport and support the half-width segment for subsequent sandblasting, painting and other construction.

[0078]

[14] The segment is supported by the support pier support fixture system 9 and the combined multi-faceted support pier 12 to ensure the stability of the beam segment support during the ship loading and transportation process and to ensure that the beam segment does not deform and affect the quality of the bridge deck and the overall size of the segment. The combined multi-faceted support pier 12 is connected as a whole by bolting and supported at the side web diaphragm position.

[0079]

[15] Before the segment is hoisted at the construction site, the connection welds between the support frame 91 of the support pier bracket fixture system 9 at the inclined bottom plate and the inclined bottom plate of the half-width steel-concrete composite beam segment 2 are released, and the connecting parts between the support pier 92 at the flat bottom plate and the bottom plate are released to ensure that it is separated from the inclined bottom plate and the bottom plate. At this time, the eccentric beam segment is supported by the combined multi-faceted support pier 12 and the support pier 92 at the flat bottom plate position to ensure the smooth erection and installation of the segment.

[0080] The six-segment long-line method assembly refers to that, on the assembly frame 1, the frame is used as the outer frame for controlling the cross-sectional dimensions of the segments, and the paired measuring towers 101 on both sides of the frame are used for auxiliary measurement, and the flange plate units 211, bottom plate units 212, partition plate units 213, middle web plate units 214, longitudinal partition plate units 215, side web plate units 216, and cantilever arm units 217 of the bottom steel beams 21 of the left and right eccentric half-width composite beam segments 2 and the four full-width composite beam segments 3 are matched, assembled, and welded in sequence to ensure that the cross-sectional dimensions of the bottom steel beams 21 of the six segments are matched and consistent, requiring the left and right eccentric half-width segments to be consistent. The matching misalignment of the top flange plate butt seam 2111, the bottom plate butt seam 2121 and the partition butt weld 2131 between the segments is ≤1.0mm, the matching deviation of the butt seams of the above-mentioned plate units between the left and right half-width segments 2 and the whole-width segment 3 and between segments 3 is ≤2.0mm, the top surface elevation linear deviation of the left and right eccentric half-width composite beam segments 2 and the four whole-width composite beam segments 3 is L / 3000 (L is the total segment assembly length, unit: mm), and the top surface elevation linear accuracy of the composite beam steel beam 21 is achieved by controlling the top surface elevation linearity of the uniformly distributed support plate 11 on the tire frame 1.

[0081] It should be understood that although the above embodiments provide a relatively detailed textual description of the design ideas of the present invention, these textual descriptions are only simple textual descriptions of the design ideas of the present invention, rather than limitations on the design ideas of the present invention. Any combination, addition or modification that does not exceed the design ideas of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for manufacturing an ultra-large eccentric half-width steel-concrete composite box girder, characterized by: comprising: The following steps are as follows: (1a) Overall assembly of the left and right eccentric half-width steel-concrete composite box girders; (1b) Assembly of precast concrete bridge decks by extra-long lifting frame hoists; (1c) Construction of transverse wet joints of half-width precast bridge decks; (1d) Using four beam transport flat cars in parallel to synchronously support and transport the left and right half-width steel-concrete composite box girders out of the mold; (1e) Using an integrated support pier support fixture system to support the eccentric overweight half-width steel-concrete composite box girder segments; (1f) Using four beam transport flat cars in parallel to transport the eccentric segments; (1g) Using rigid support piers to control the deformation of the half-width steel-concrete composite box girder during the large-volume wet joint construction; (1h) Using four parallel beam transport flat cars and support systems to transport and support the half-width segments for subsequent sandblasting and painting construction; (1i) Using an integrated support pier support fixture system and a combined multi-faceted stool to support the segments to ensure that the eccentric segments are transported and supported stably; [1] The overall assembly of the left and right eccentric half-width steel-concrete composite box beams: (1) On the long-line assembly frame, the bottom steel beams of the left and right eccentric half-width segments and the two full-width beam segments at both ends of their length direction are assembled together to realize the long-line assembly of six segments. The left and right eccentric half-width segments are temporarily connected into a whole by temporary matching parts to ensure the matching size between the half-width segments and the overall assembly accuracy of the half-width segments and the full-width segments adjacent to the front and rear; (2) Internal support of half-width steel-concrete composite box beam: In order to increase the overall stiffness of the left and right half-width steel beams, rigid support is added inside the half-width steel-concrete composite beam before the super-heavy precast concrete bridge deck is superimposed and assembled with the half-width steel beam, so as to provide accuracy guarantee for the superposition of the bridge deck; [2] The super-long lifting frame hoist is used to hoist and assemble precast concrete bridge decks: The super-long lifting frame-type hoisting device includes a frame-type main beam. The upper part of the frame-type main beam is provided with a lifting lug for connecting the lifting wire ropes of two parallel cranes. The lower part of the frame-type main beam is provided with a lifting lug for connecting the lifting wire ropes of the prefabricated bridge deck. The position of the lifting lug at the lower part of the main beam is guaranteed to be directly above the lifting point of the prefabricated bridge deck, and by adjusting the length of the wire ropes at the lifting points on both sides of the transverse bridge, the aerial posture of the bridge deck during lifting is consistent with the i% transverse slope of the bridge deck, ensuring that the bridge deck is safely and reliably stressed. [3] Assembly and welding of precast concrete bridge deck and steel beam: On the measuring towers on both sides of the main assembly line, the position of the precast bridge deck is adjusted by monitoring and measuring with the baseline of the steel beam and bridge deck as the reference. The frame hanger and jack are used to assist in the adjustment to ensure the accurate matching and positioning with the steel beam. After the assembly accuracy is ensured, the welds of the embedded steel components of the bridge deck and the partitions and flange plates of the steel beam are welded to make them a whole. [4] Construction of transverse wet joints of the half-width precast bridge deck: The transverse wet joints between welded bridge decks are filled with steel bars, the splicing plates are bolted, and the transverse wet joints are cast to connect the prefabricated bridge decks into a whole; [5] Temporary connection of the left and right half steel-concrete composite box beams: Temporary connecting plates are welded at the top flange plate butt joint, diaphragm plate butt joint and bottom plate butt joint positions in the middle of the left and right half steel-concrete composite beams, so that the left and right half eccentric beam sections are temporarily connected into a whole; [6] The four beam transport flat cars are connected in parallel to synchronously support and transport the left and right half steel-concrete composite box beams to be transported as a whole: Remove the movable beam above the beam transport channel of the general assembly frame, and use four beam transport flat cars with a capacity of more than 300 tons in parallel, with two beam transport cars in front and behind each lane on each side. The four cars support the beam section at the same time and move synchronously to transport the beam section out of the tire to ensure that the four cars are evenly stressed and support stable; [7] The use of an integrated support pier support fixture system to support an eccentric overweight half-width steel-concrete composite box girder segment refers to: (1) According to the center of gravity position of the half-width eccentric steel-concrete composite beam section, an integrated support pier bracket fixture system was developed. The integrated support pier bracket fixture system includes a support frame connected to the inclined bottom plate of the half-width steel-concrete composite beam and a steel support pier connected to the flat bottom plate. Each support frame spans two or three transverse partitions, and four or six steel support piers are bolted and integrated directly below the box beam partition. The gap between the bottom adjustment plate of the support frame and the top plate of the steel support pier is controlled by adjusting the bolts, and the height of the support beam section is adjusted by adding an adjustment pad, so as to ensure that each support point is evenly stressed during the support process. (2) After the half-width eccentric steel-concrete composite box girder segment is produced, the developed integrated support pier support tooling system is first used to support the temporarily connected left and right half-width steel-concrete composite box girder segments to ensure that the support points are evenly stressed. Then, the temporary matching parts of the top plate, bottom plate, and partition plate in the middle of the left and right half-width steel-concrete composite beam segments and the temporary reinforcement plate are removed to separate the left and right eccentric half-width steel-concrete composite box girders; [8] The method of transporting the eccentric segment by using four beam transport flat cars in parallel means: using four beam transport flat cars with a capacity of more than 200 tons in parallel, with two beam transport flat cars at the front and rear of each lane, and the four cars supporting the beam segment at the same time, and moving synchronously to transport the half-width beam segment, ensuring that the four cars are evenly stressed and support stably, and the support frame together with the integrated support piers are transported together with the beam; [9] The use of rigid support piers to control the deformation of large-scale wet joints of half-width steel-concrete composite box girders during construction refers to: (1) In order to control the deformation of the large-volume longitudinal wet joints of the steel-concrete composite beam segment, before the wet joints are cast, a rigid support pier of the steel-concrete structure is added on the basis of the support pier support tooling system. The rigid support pier is supported at the side web position with relatively weak rigidity, and the support point is supported at each cantilever diaphragm of the beam segment and the beam ends on both sides. The adjustment pad is used to support and level the segment to ensure that the top surface elevation of the segment is level, and that each support point is evenly stressed, so that the cross-sectional dimensions of the segment are consistent with the dimensions during the overall assembly acceptance. (2) Use a rigid support formwork and pre-press the formwork to eliminate inelastic deformation. According to the amount of pre-pressed elastic deformation, correct the amount of elastic deformation compensation of the formwork, and finally pour wet joint concrete to complete the wet joint pouring construction of the half-width steel-concrete composite box girder; [10] The use of four parallel beam transport flat cars and a support system to transport and support the half-width segment for subsequent sandblasting and painting construction refers to: after the wet joints of the bridge deck are cast, the steel-concrete composite box girder is supported again by the integrated support pier support tooling system after the wet joints have reached the required strength, and the four parallel beam transport flat cars are used for synchronous transportation to complete the support and reverse transportation work during the sandblasting and painting construction in the segment sandblasting room and the painting plant; [11] The use of an integrated support pier support fixture system and a modular multi-faceted stool support segment to ensure stable support for eccentric segment transportation refers to: (1) Use the support pier support fixture system and the combined multi-faceted support pier to support the segment to ensure the stability of the beam segment support during the loading and transportation process and to ensure that the beam segment does not deform and affect the quality of the bridge deck and the overall size of the segment. The combined multi-faceted support pier consists of multiple multi-faceted support piers connected as a whole by bolts and supported at the side web diaphragm position; (2) Dismantling and hoisting of the integrated support pier support tooling system: Before hoisting the segment at the construction site, remove the connecting welds between the supporting frame of the supporting pier bracket tooling system at the inclined bottom plate and the inclined bottom plate of the half-width steel-concrete composite beam segment, and remove the connecting parts between the supporting pier and the bottom plate at the flat bottom plate to ensure that it is separated from the inclined bottom plate and the bottom plate. At this time, the eccentric beam segment is supported by the combined multi-faceted supporting piers and the supporting piers at the flat bottom plate position to ensure smooth erection and installation of the segment.

Images