CN115961549A - Rear-feeding beam type erection construction method for large-tonnage whole-section steel beam of cable-stayed bridge - Google Patents
Rear-feeding beam type erection construction method for large-tonnage whole-section steel beam of cable-stayed bridge Download PDFInfo
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- CN115961549A CN115961549A CN202211541639.1A CN202211541639A CN115961549A CN 115961549 A CN115961549 A CN 115961549A CN 202211541639 A CN202211541639 A CN 202211541639A CN 115961549 A CN115961549 A CN 115961549A
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Abstract
The application discloses a post-feeding beam type erection construction method for large-tonnage whole-section steel beams of a cable-stayed bridge, which comprises the steps of building a longitudinal support beside a pier of a main tower, building a transverse support on one side of the longitudinal support, and completing construction of steel-concrete combined sections on two sides of the main tower on the longitudinal support; lifting the assembly welding modules to a transverse support one by utilizing a lifting station, assembling the assembly welding modules into standard sections, completing the assembly and transfer of a plurality of standard sections, assembling and welding the reinforced concrete combination section and the plurality of standard sections into a whole on a longitudinal support, and lifting the transverse support until the transverse support is flush with the surface of a starting end; and then completing standard section assembly below the gantry crane, longitudinally moving the standard section to the lower part of a bridge girder erection machine by utilizing a lifting station and the gantry crane, and finally completing the assembly of the standard section and the steel-concrete combined section so as to complete the erection of the steel girder. So as to finish the step of splicing the steel box girder in the area with narrow construction site and complex peripheral topography.
Description
Technical Field
The application relates to the field of construction of cable-stayed bridges, in particular to a post-feeding type erection construction method for large-tonnage whole-section steel beams of a cable-stayed bridge.
Background
At present, three general methods for erecting steel beams of a cable-stayed bridge are provided, one method is a cantilever splicing method, and the method is mainly characterized in that a beam section is firstly transported to a bridge position to be erected, and then is vertically hoisted and erected in place by using a bridge deck crane. The method can be realized only when a transportation channel is arranged at the bridge position; a longitudinal pushing method for installing a row of temporary piers at bridge position and hanging cable to realize the system conversion of cable-stayed bridge features that an assembling site and a transportation channel are arranged at one or both ends of bridge, and includes such steps as installing a steel box beam on the frame, installing steel box beam on the frame, loading the steel box beam on the frame, installing steel beam, installing cable, stretching, and converting.
However, when a steel beam cable-stayed bridge needs to be built across a limited construction site such as an existing road bridge, a mountain area, a river and the like, particularly on an already-running expressway, the problems of narrow construction site and complex terrain are faced, ground traffic is easily interfered during construction, and the construction of assembling steel box beam sections by a cantilever assembling method and a longitudinal jacking method is difficult to complete, so that an improvement space still exists.
Disclosure of Invention
In order to complete the splicing step of the steel box girder in the area with narrow construction site and complex peripheral topography, the application provides a post-feeding girder type erection construction method for large-tonnage whole section steel girder of a cable-stayed bridge.
The application provides a cable-stay bridge large-tonnage whole section girder steel post-feeding beam type erection construction method which adopts the following technical scheme:
a post-feeding beam type erection construction method for large-tonnage whole-section steel beams of a cable-stayed bridge comprises the following steps:
s1: construction preparation: dividing the standard segment of the steel box girder into three combined modules for manufacturing, and performing pre-splicing in a pre-splicing field;
s2: erecting a support: building a longitudinal support beside a main tower pier, wherein the longitudinal support extends along the bridge direction, a supporting surface of the longitudinal support is positioned above a road, building a transverse support on one side of the longitudinal support, and a supporting surface of the transverse support is connected with a supporting surface of the longitudinal support;
s3: construction of the reinforced concrete joint section: finishing the construction of the reinforced concrete combined sections on two sides of the main tower on the longitudinal support;
s4: construction of a lifting station: a lifting station is built at the transverse support and used for lifting the combined module to the transverse support;
s5: construction of an initial section: lifting the assembly welding modules to the transverse supports one by utilizing a lifting station, assembling and welding the assembly welding modules into standard steel box girder sections, transversely moving the standard sections to the supporting surface of the longitudinal supports, longitudinally moving the standard sections to the positions, far away from one end of the main tower, of the longitudinal supports, completing the assembly and transfer of a plurality of standard sections according to the steps, and assembling and welding the reinforced concrete combination sections and the plurality of standard sections into a whole on the longitudinal supports to complete the construction of the initial section on one side of the main tower;
s6: lifting the transverse bracket: lifting the supporting surface of the transverse bracket to be flush with the upper surface of the initial section and connecting the supporting surface and the upper surface;
s7: installing a gantry crane and a bridge girder erection machine: installing a gantry crane and a bridge girder erection machine on the upper surface of the initial section, wherein the gantry crane and the bridge girder erection machine can move along the bridge direction;
s8: and (3) post-beam feeding construction: lifting the assembly welding modules to the supporting surface of the transverse support one by using a lifting station, assembling and welding the assembly welding modules into a standard steel box girder segment, transversely moving three assembly welding modules to the upper surface of the initial section and longitudinally moving the assembly welding modules to the lower part of a gantry crane, adjusting the positions of the three assembly welding modules by the gantry crane, assembling the three assembly welding modules into the standard segment, longitudinally moving the standard segment to the lower part of a bridge girder erection machine, lifting the girder of the bridge girder erection machine and longitudinally moving the standard segment, and rotating the standard segment by ninety degrees after the standard segment is longitudinally moved in place. Then, the beam is dropped, and finally, the splicing of the standard section and the steel-concrete combined section is completed so as to complete the erection of the first section of steel beam;
s9: and repeating the S8, and continuously moving the bridge girder erection machine forwards to complete the assembly of the remaining standard sections of the steel box girder.
By adopting the technical scheme, the standard section of the steel box girder is divided into three assembling and welding modules, the purpose is to facilitate the transportation of the steel box girder in a narrow and small place, the lifting weight of the section is reduced, and the horizontal movement of the section on a horizontal support is facilitated.
Preferably, in S5, a transverse guide rail is installed on the transverse support, the transverse guide rail extends transversely to the longitudinal support, a longitudinal guide rail is installed on the longitudinal support, the longitudinal guide rail is connected with the transverse guide rail, the longitudinal guide rail extends along the bridge direction, and during the movement of the standard segment, the transverse guide rail is firstly moved transversely to the longitudinal support along the transverse guide rail, and then the longitudinal guide rail is moved longitudinally to the end of the longitudinal support along the longitudinal guide rail.
Through adopting above-mentioned technical scheme, design violently indulges the guide rail to the accurate position that falls of standard segment is favorable to standard segment to assemble.
Preferably, the lifting station comprises two rows of support frames which are distributed transversely, the transverse support is positioned between the two rows of support frames, and two sides of the transverse support are respectively connected to the inner sides of the two rows of support frames in a vertical sliding manner.
Through adopting above-mentioned technical scheme, the support frame not only plays the supporting role to the hoisting station, plays spacing and guide effect to horizontal support simultaneously, is favorable to the stable lift of horizontal support, and then improves steel box girder transportation efficiency.
Preferably, the lifting station is provided with lifting means for lifting the transverse support.
Through adopting above-mentioned technical scheme to realize the automatic lift of horizontal support, reduce loop wheel machine equipment and drop into, be favorable to improving the installation effectiveness of horizontal support simultaneously.
Preferably, in S6, after the supporting surface of the transverse bracket is lifted to the designed height, the upright column below the transverse bracket is lengthened upwards, and the upright column supports the supporting surface of the transverse bracket.
By adopting the technical scheme, the stability of the transverse support is improved.
Preferably, in S8, a movable protective shed is built at the highway, the movable protective shed moves along the highway, and the movable protective shed moves to a position below the standard segment during the standard segment in-place installation process.
Through adopting above-mentioned technical scheme, portable protection canopy plays the guard action, is favorable to improving the construction safety nature.
Preferably, the S3 includes:
s3.1: installing a jig frame on the longitudinal support, then assembling the steel box girder on the jig frame, dismantling the jig frame after the steel box girder is welded, and supporting the steel box girder on the longitudinal support by using a distribution beam;
s3.2: binding steel bars and pouring concrete of the bottom plate of the steel-concrete combined section;
s3.3: after the bottom plate concrete reaches the designed strength, installing a counter-pulling structure on the top surface of the steel box girder, and applying a pretension force to each counter-pulling reinforcing steel bar to form consolidation between the steel-concrete combined section and the lower cross beam of the main tower;
s3.4: and (4) erecting an internal mold in the reinforced concrete combining section, and pouring web plate and top plate concrete.
By adopting the technical scheme, the construction precision and the stability of the steel-concrete combined section are improved.
Drawings
Fig. 1 is a schematic view of a state of a welding module assembled into a standard section on a transverse support in a cable-stayed bridge large-tonnage whole-section steel beam post-feeding beam type erection construction method according to an embodiment of the application.
Fig. 2 is an enlarged schematic view at a in fig. 1.
Fig. 3 is a schematic view of a state of an initial section assembled in a cable-stayed bridge large-tonnage whole section steel beam post-feeding type erection construction method according to the embodiment of the application.
Fig. 4 is a schematic diagram of a state when a gantry crane and a bridge crane are installed in the cable-stayed bridge large-tonnage whole-section steel beam post-feeding type erection construction method according to the embodiment of the application.
Fig. 5 is a schematic view of a state of a standard section of a suspended spliced steel box girder in a cable-stayed bridge large-tonnage whole-section steel girder post-feeding type erection construction method according to the embodiment of the application.
Description of reference numerals: 1. a main tower; 2. a steel-concrete combined section; 3. a longitudinal support; 4. a highway; 5. a lift station; 51. a support frame; 52. a lifting device; 6. a transverse support; 7. a standard segment; 71. assembling and welding the modules; 8. a transverse guide rail; 9. a longitudinal guide rail; 10. an initial segment; 11. a column; 12. a bridge girder erection machine; 13. a gantry crane; 14. portable protection canopy.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a post-feeding beam type erection construction method for large-tonnage whole-section steel beams of a cable-stayed bridge. The method comprises the following steps:
s1: construction preparation: referring to fig. 1 and 2, the standard segment 7 of the steel box girder is divided into three combined modules for manufacturing, and pre-splicing is carried out in a pre-splicing field;
s2: erecting a support: a longitudinal support 3 is built beside a pier of a main tower 1, the longitudinal support 3 extends along a bridge direction, a supporting surface of the longitudinal support 3 is positioned above a road 4, a transverse support 6 is built on one side of the longitudinal support 3, and the supporting surface of the transverse support 6 is connected with the supporting surface of the longitudinal support 3.
The vertical support 3 and the transverse support 6 are respectively formed by erecting a distribution beam on a steel pipe upright post 11 with the diameter of 800mm and the diameter of 630mm, the distribution beam is formed by mounting a Bailey truss, and the square distribution beam and the Bailey beam jointly form a support surface of the support. A stable bracket system is formed by the transverse connection system between the steel pipe upright posts 11. The steel pipe upright post 11 and the post cap thereof are manufactured in a steel structure processing field, two tower cranes arranged at the position of the main tower 1 are used for installation, and the bottom of the upright post 11 is welded with a foundation embedded part and a stiffening rib after the verticality of the upright post is adjusted. The connection system and the hoop are installed at the same time of installing the steel pipe upright post 11, so as to form a stable structure.
S3: and (3) constructing the reinforced concrete joint section 2: the construction of the reinforced concrete combined section 2 on two sides of the main tower 1 is completed on the longitudinal support 3, and the concrete construction steps of the reinforced concrete combined section 2 are as follows:
s3.1: installing a jig frame on the longitudinal support 3, then assembling the steel box girder on the jig frame, dismantling the jig frame after the steel box girder is welded, and supporting the steel box girder on the longitudinal support 3 by using a distribution beam;
s3.2: binding steel bars and pouring bottom plate concrete of the steel-concrete combined section 2;
s3.3: after the bottom plate concrete reaches the design strength, installing a counter-pulling structure on the top surface of the steel box girder, and applying pretension to each counter-pulling reinforcing steel bar to enable the steel-concrete combined section 2 to be solidified with the lower cross beam of the main tower 1;
s3.4: and (3) erecting an internal mold in the reinforced concrete combining section 2, and pouring web plate and top plate concrete.
In order to reduce the load bearing and deformation of the bracket of the steel-concrete combined section 2, pouring concrete is carried out twice, the bottom plate of the steel box girder of the steel-concrete combined section 2 is poured for the first time, and the pouring square amount is 129.6m in a double-faced mode; and carrying out pouring on the web plate and the top plate for the second time, wherein the pouring square amount is 127.7m in dry bottom. Before the first pouring, the supporting points are pre-lifted, the pre-lifting value is determined according to pre-pressing measured data, and meanwhile, the steel box girder bottom plate and the partition plate are stiffened at the supporting points. And before the second pouring, the second pouring is carried out after the top plate with the hole is installed. The steel box girder top plate and the embedded part at the top port of the lower cross beam are connected through channel steel to form temporary anchoring, so that the load borne by the first-time concrete is reduced, the deformation of the support is reduced, and the contact surface between the first-time concrete and the lower cross beam is prevented from generating overlarge tensile stress and cracking during pouring.
S4: construction of a lifting station 5: a lifting station 5 is set up at the transverse support 6, the lifting station 5 being used to lift the combined module onto the transverse support 6. The 5 major structure of lifting station is the frame construction that the steel pipe is constituteed, wherein includes two support frames 51, and support frame 51 is as the supporting part, and girder and lifting beam all adopt bailey roof beam in addition. The hoisting equipment mainly comprises 2 8t hoisters and two 80t overhead cranes, wherein the hoisters adopt phi 25mm steel wire ropes, the pulleys adopt five doors, and the steel wire ropes run ten times. The lifting station 5 is arranged at one corner close to the large mileage of the outer main tower 1 and is parallel to the main beam of the support.
Wherein, horizontal support 6 is located between two support frames 51, just horizontal support 6 holding surface both sides vertical sliding connection respectively in two support frames 51 inboards, support frame 51 not only plays the supporting role to hoisting station 5, plays spacing and guide effect to horizontal support 6 simultaneously, is favorable to horizontal support 6's stable lift. A lifting device 52 for driving the transverse bracket 6 to ascend and descend is installed on the main beam, and the lifting device 52 is specifically a winch.
S5: construction of an initial section 10: referring to fig. 2 and 3, the purpose of the initial segment 10 construction is to provide a platform for assembling a gantry crane 13 and bridging.
Lifting the assembly welding modules 71 to the transverse supports 6 one by using the lifting station 5, assembling and welding the assembly welding modules to form standard steel box girder sections 7, transversely moving the standard sections 7 to the supporting surfaces of the longitudinal supports 3, longitudinally moving the standard sections 7 to the positions, far away from one end of the main tower 1, of the longitudinal supports 3, completing the assembly and transfer of the plurality of standard sections 7 according to the steps, and then assembling and welding the steel-concrete combined section 2 and the plurality of standard sections 7 on the longitudinal supports 3 into a whole to complete the construction of the initial section 10 on one side of the main tower 1.
S6: the transverse bracket 6 is lifted: lifting the supporting surface of the transverse bracket 6 to be flush with the upper surface of the initial section 10 and connecting;
s7: installing a gantry crane 13 and a bridge girder erection machine 12: referring to fig. 4, a gantry crane 13 and a bridge girder erection machine 12 are installed on the upper surface of the initial section 10, and the gantry crane 13 and the bridge girder erection machine 12 can move along the bridge direction.
S8: and (3) rear feeding beam construction: referring to fig. 4 and 5, the assembly welding modules 71 are lifted one by one to the supporting surface of the transverse support 6 by the lifting station 5, and are assembled and welded into the standard steel box girder segment 7, then the three assembly welding modules 71 are moved transversely to the upper surface of the initial section 10 and moved longitudinally below the gantry crane 13, the positions of the three assembly welding modules are adjusted by the gantry crane 13, then the three assembly welding modules are assembled into the standard segment 7, and then the standard segment 7 is moved longitudinally below the bridge girder erection machine 12.
And (2) constructing a movable protection shed 14 at the expressway 4, moving the movable protection shed 14 along the direction of the expressway 4, and moving the movable protection shed 14 to the position below the standard segment 7 in the process of positioning and installing the standard segment 7.
The bridge girder erection machine 12 lifts the beam and moves longitudinally, and the standard segment 7 rotates ninety degrees after moving longitudinally. And then, falling the beam, and finally completing the splicing of the standard segment 7 and the reinforced concrete combined segment 2 so as to complete the erection of the first section of steel beam.
S9: and repeating the step S8, and continuously moving the bridge girder erection machine 12 forward to complete the assembly of the remaining standard steel box girder segments 7.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. A post-feeding beam type erection construction method for large-tonnage whole-section steel beams of cable-stayed bridges is characterized by comprising the following steps of: the method comprises the following steps:
s1: construction preparation: dividing a standard segment (7) of the steel box girder into three combined modules for manufacturing, and performing pre-splicing on a pre-splicing field;
s2: erecting a support: building a longitudinal support (3) beside a pier of a main tower (1), wherein the longitudinal support (3) extends along a bridge direction, a supporting surface of the longitudinal support (3) is positioned above a road (4), a transverse support (6) is built on one side of the longitudinal support (3), and the supporting surface of the transverse support (6) is connected with the supporting surface of the longitudinal support (3);
s3: constructing the steel-concrete combined section (2): finishing the construction of the steel-concrete combined sections (2) at two sides of the main tower (1) on the longitudinal support (3);
s4: construction of a lifting station (5): a lifting station (5) is built at the position of the transverse support (6), and the lifting station (5) is used for lifting the combined module to the transverse support (6);
s5: constructing an initial section (10): lifting the assembly welding modules (71) to a transverse support (6) one by utilizing a lifting station (5), assembling and welding the assembly welding modules to form a standard steel box girder segment (7), transversely moving the standard segment (7) to a supporting surface of a longitudinal support (3), longitudinally moving the standard segment to one end position of the longitudinal support (3) far away from a main tower (1), assembling and transferring a plurality of standard segments (7) according to the steps, and assembling and welding a steel-concrete combination section (2) and a plurality of standard segments (7) on the longitudinal support (3) into a whole to complete construction of an initial section (10) on one side of the main tower (1);
s6: lifting the transverse bracket (6): lifting the supporting surface of the transverse bracket (6) to be flush with the upper surface of the initial section (10) and connecting;
s7: installing a gantry crane (13) and a bridge girder erection machine (12): a gantry crane (13) and a bridge girder erection machine (12) are arranged on the upper surface of the initial section (10), and the gantry crane (13) and the bridge girder erection machine (12) can move along the bridge direction;
s8: and (3) post-beam feeding construction: lifting the assembly welding modules (71) to the supporting surface of the transverse support (6) one by utilizing a lifting station (5), assembling and welding the assembly welding modules to form a standard steel box girder segment (7), transversely moving three assembly welding modules (71) to the upper surface of the initial section (10) and longitudinally moving the three assembly welding modules to the position below a gantry crane (13), adjusting the positions of the three assembly welding modules through the gantry crane (13), assembling the three assembly welding modules to form the standard segment (7), longitudinally moving the standard segment (7) to the position below a bridge girder erection machine (12), lifting and longitudinally moving the bridge girder erection machine (12), and rotating the standard segment (7) by ninety degrees after longitudinally moving the standard segment to the position. Then, the beam is dropped, and finally, the splicing of the standard section (7) and the steel-concrete combined section (2) is completed so as to complete the erection of the first section of steel beam;
s9: and repeating the step S8, and continuously moving the bridge girder erection machine (12) forwards to complete the assembly of the remaining standard sections (7) of the steel box girder.
2. The cable-stayed bridge large-tonnage whole-section steel beam post-feeding type erection construction method according to claim 1, which is characterized in that: in the S5, a transverse guide rail (8) is installed on a transverse support (6), the transverse guide rail (8) transversely extends to a longitudinal support (3), a longitudinal guide rail (9) is installed on the longitudinal support (3), the longitudinal guide rail (9) is connected with the transverse guide rail (8), the longitudinal guide rail (9) extends along the bridge direction, and in the moving process of the standard section (7), the transverse guide rail (8) is firstly transversely moved to the longitudinal support (3) and then longitudinally moved to the end part of the longitudinal support (3) along the longitudinal guide rail (9).
3. The cable-stayed bridge large-tonnage whole-section steel beam post-feeding type erection construction method according to claim 1, which is characterized in that: the lifting station (5) comprises two rows of transversely distributed support frames (51), the transverse support (6) is positioned between the two rows of support frames (51), and two sides of the transverse support (6) are respectively vertically connected to the inner sides of the two rows of support frames (51) in a sliding manner.
4. The cable-stayed bridge large-tonnage whole-section steel beam post-feeding type erection construction method according to claim 1, which is characterized in that: the lifting station (5) is provided with a lifting device (52) for lifting the transverse support (6).
5. The cable-stayed bridge large-tonnage whole-section steel beam post-feeding type erection construction method according to claim 1, which is characterized in that: and in the S6, after the supporting surface of the transverse bracket (6) is lifted to the designed height, the upright (11) below the transverse bracket (6) is lengthened upwards, and the upright (11) supports the supporting surface of the transverse bracket (6).
6. The cable-stayed bridge large-tonnage whole-section steel beam post-feeding type erection construction method according to claim 1, which is characterized in that: in the S8, a movable protection shed (14) is built on the highway (4), the movable protection shed (14) moves along the direction of the highway (4), and in the in-place installation process of the standard segment (7), the movable protection shed (14) moves to the position below the standard segment (7).
7. The cable-stayed bridge large-tonnage whole-section steel beam post-feeding type erection construction method according to claim 1, which is characterized in that: the S3 comprises the following steps:
s3.1: installing a jig frame on the longitudinal support (3), then assembling the steel box girder on the jig frame, dismantling the jig frame after the steel box girder is welded, and supporting the steel box girder on the longitudinal support (3) by using a distribution beam;
s3.2: binding steel bars and pouring bottom plate concrete of the steel-concrete combined section (2);
s3.3: after the bottom plate concrete reaches the designed strength, installing a counter-pulling structure on the top surface of the steel box girder, and applying a pretension force to each counter-pulling reinforcing steel bar to enable the steel-concrete combined section (2) to be fixedly connected with the lower cross beam of the main tower (1);
s3.4: and (3) erecting an internal mold in the steel-concrete combining section (2) and pouring web plate and top plate concrete.
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| CN202211541639.1A CN115961549A (en) | 2022-12-02 | 2022-12-02 | Rear-feeding beam type erection construction method for large-tonnage whole-section steel beam of cable-stayed bridge |
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| CN117328369A (en) * | 2023-11-30 | 2024-01-02 | 北京建工集团有限责任公司 | Mounting method of combined box girder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117328369A (en) * | 2023-11-30 | 2024-01-02 | 北京建工集团有限责任公司 | Mounting method of combined box girder |
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