CN114232488A - Method for erecting main beam of large-span cable-stayed bridge - Google Patents
Method for erecting main beam of large-span cable-stayed bridge Download PDFInfo
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- CN114232488A CN114232488A CN202111539826.1A CN202111539826A CN114232488A CN 114232488 A CN114232488 A CN 114232488A CN 202111539826 A CN202111539826 A CN 202111539826A CN 114232488 A CN114232488 A CN 114232488A
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- 238000010276 construction Methods 0.000 claims abstract description 55
- 238000009434 installation Methods 0.000 claims abstract description 19
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- 210000001503 joint Anatomy 0.000 claims 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
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Abstract
The invention provides a method for erecting a main girder of a large-span cable-stayed bridge, which has the technical scheme that the method for erecting the main girder of the large-span cable-stayed bridge comprises the following steps of constructing a main tower, an auxiliary pier and a transition pier, wherein a preset height is reserved between the top of the auxiliary pier and the main girder; building a tower section beam at the main tower; installing a main beam erection construction system on the beam section of the tower area; after being integrally lifted, a single beam section to be installed is horizontally transferred to the front end of the installed beam section for installation; repeating the previous step until the main beam is spliced to the auxiliary pier; carrying out height connection construction on the auxiliary piers to connect the auxiliary piers with the main beam; and repeating the step of horizontally transferring the single beam section to be installed to the front end of the installed beam section after the integral lifting of the beam section to be installed until the main span is closed. According to the construction method, the beam sections are integrally installed, the assembling precision is high, the line shape of the main beam is easy to guarantee, the bridge construction quality is high, and the construction speed is higher.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a method for erecting a main beam of a large-span cable-stayed bridge.
Background
In the bridge construction process, the conditions of landforms, navigation or property units existing below the ground of a bridge are limited, and the main beam sections do not have direct vertical lifting installation conditions, so that the construction difficulty of the main beam is caused. The existing bridge deck crane cantilever splicing construction process is usually adopted, but the construction method requires that a main beam steel structure is an orthotropic steel beam which generally comprises main longitudinal beams, cross beams, small longitudinal beams and other components, all the components are conveyed to the bridge deck crane to be spliced one by one, the splicing speed of the construction method is low, and the linear shape of the main beam is not easy to guarantee.
Disclosure of Invention
The invention aims to provide a main beam erection method of a large-span cable-stayed bridge, which can improve the assembling construction speed of a main beam and ensure the linear shape of the main beam.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for erecting a main girder of a large-span cable-stayed bridge comprises the following steps:
constructing a main tower, an auxiliary pier and a transition pier, and reserving a preset height between the top of the auxiliary pier and a main beam;
building a tower section beam at the main tower;
installing a main beam erection construction system on the beam section of the tower area;
after being integrally lifted, a single beam section to be installed is horizontally transferred to the front end of the installed beam section for installation;
repeating the previous step until the main beam is spliced to the auxiliary pier;
carrying out height connection construction on the auxiliary piers to connect the auxiliary piers with the main beam;
and repeating the step of horizontally transferring the single beam section to be installed to the front end of the installed beam section after the integral lifting of the beam section to be installed until the main span is closed.
Further, when a tower section is built at the main tower, the method comprises the following steps:
building an initial beam section at a main tower;
building a tower area support below the initial beam section;
assembling the tower area support to form a tower area beam section;
installing stay cables on the beam section of the tower area and tensioning the stay cables;
and (5) dismantling the tower area bracket.
Further, when the single beam section to be installed is horizontally transferred to the front end of the installed beam section for installation after being integrally lifted, the method comprises the following steps:
vertically hoisting a beam section to be installed from the root of the cable tower to the position right below the installed beam section;
translating the beam section to be installed to the front of the installed beam section along the bridge direction by using a linear transfer device;
lifting the beam section to be installed, and butting and assembling the beam section to be installed and the front end of the installed beam section;
and resetting the linear transfer device.
Further, before translating the beam section to be installed to the front of the installed beam section along the bridge direction by using a linear transfer device, the method comprises the following steps:
and respectively connecting two ends of the beam section to be installed in the width direction with two C-shaped beams which are installed at two ends of the installed beam section in the linear transfer device correspondingly.
Further, when translating the beam section to be installed to the front of the installed beam section along the bridge direction by using a linear transfer device, the method comprises the following steps:
the sliding beam in the linear transfer device drives the C-shaped beam to move to the front end of the installed beam section along the installed beam section, and the front end of the sliding beam extends to the front of the installed beam section;
releasing the connection between the C-shaped beam and the sliding beam;
and driving the C-shaped beam to drive the beam section to be installed to move to the front end position of the sliding beam along the sliding beam.
Further, after the sliding beam in the linear transfer device drives the C-shaped beam to move along the installed beam section to the front end of the installed beam section and the front end of the sliding beam extends to the front of the installed beam section, the method further comprises the following steps:
the front end of the sliding beam is fixed with the bridge deck crane by the sling.
Further, when the straight line transfer device is reset, the method comprises the following steps:
moving the C-shaped beam from the front end position of the sliding beam to the rear end position of the sliding beam and then fixing the C-shaped beam with the sliding beam;
the skid beam is moved to an initial position along the installed beam section.
Further, before the beam section to be installed is vertically hoisted to be right below the installed beam section from the root of the cable tower, the method comprises the following steps:
one section of beam section to be installed is used as a reference section, and the beam section to be installed is matched and assembled to form the other section of beam section to be installed.
Further, when one section of beam section to be installed is adopted as a reference section and another section of beam section to be installed is formed by matching and assembling, the method comprises the following steps:
the N beam sections are used as reference sections and are sequentially matched and assembled along the same installation direction to form an N +1 beam section and an N +2 beam section;
the connection between the N beam section and the N +1 beam section is released;
and taking the N +1 beam section as a reference section, and repeatedly executing the steps until the assembly of the beam section to be installed is completed.
Further, after the beam section to be installed is lifted and assembled with the front end of the installed beam section in an abutting mode, the method further comprises the following steps:
installing corresponding stay cables on the assembled beam sections, and performing first tensioning construction on the stay cables;
and (5) mounting a bridge deck on the beam section and then performing secondary tensioning construction on the stay cable.
Compared with the prior art, the scheme of the invention has the following advantages:
1. according to the method for erecting the main beam of the large-span cable-stayed bridge, after a main tower, an auxiliary pier and a transition pier are built, a tower section is built at the position of the main tower, and a beam section to be installed is lifted from the lower part of the tower section and then horizontally transferred to the front end of the installed beam section for splicing until the main beam is closed.
2. In the method for erecting the main beam of the large-span cable-stayed bridge, the matched structure of the C-shaped beam and the sliding beam is adopted, the beam section to be installed is stably transported, the overall structure is simpler, the installation operation difficulty is low, the line shape of the main beam is easy to ensure, and the construction quality of the bridge is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a front view of a main girder erection construction system of a large-span cable-stayed bridge according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a state in which a girder segment to be installed is hoisted by a gantry crane in a main girder erection construction system of a large-span cable-stayed bridge according to an embodiment of the invention;
FIG. 3 is a schematic view of a gantry crane lifting a beam segment to be installed according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a state in which a sliding beam transfers a beam segment to be installed to a front end position of an installed beam segment according to an embodiment of the present invention;
FIG. 5 is a schematic view of a C-beam transferring a beam segment to be installed below a deck crane according to an embodiment of the present invention;
FIG. 6 is a schematic view of a bridge deck crane lifting a beam segment to be installed according to an embodiment of the present invention;
FIG. 7 is a side view of a main girder erection construction system of a large-span cable-stayed bridge according to an embodiment of the present invention;
FIG. 8 is a first flowchart of a method for erecting a main girder of a large-span cable-stayed bridge according to an embodiment of the present invention;
FIG. 9 is a second flowchart of a method for erecting a main girder of a large-span cable-stayed bridge according to an embodiment of the present invention;
fig. 10 is a schematic view illustrating a construction process of a main girder according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
As shown in fig. 1 to 7, the invention provides a main girder erection construction system 1 of a large-span cable-stayed bridge, which comprises a first hoisting device, a slide way (not shown in the figure), a linear transfer device and a second hoisting device, wherein the first hoisting device is used for hoisting a beam section 2 to be installed to the linear transfer device, the slide way is used for providing movement guidance for the linear transfer device, the linear transfer device is used for transferring the beam section 2 to be installed to the second hoisting device from the first hoisting device, and the second hoisting device is used for being installed at the front end position of an installed beam section 3 and hoisting the beam section 2 to be installed to a specified height to be spliced with the installed beam section 3.
The beam section 2 to be installed is lifted by the first lifting device, then the linear transfer device is transferred to the position below the front end of the installed beam section 3, the second lifting device is used for lifting, the beam section can be assembled in advance by adopting the construction system and then lifted for installation, the loose parts are not required to be transferred to the bridge floor for assembly, the installation difficulty of the main beam is reduced, the linear shape of the main beam is ensured, and the construction speed is accelerated. The construction system is suitable for girder systems needing to be pre-assembled, such as orthotropic girder systems, steel box girders, superposed girder systems and the like.
In this embodiment, the first hoisting device is a gantry crane 11, the gantry crane 11 is installed at a beam section adjacent to the main tower region, the second hoisting device is a bridge crane 12, the bridge crane 12 is installed at a front end of the installed beam section 3, a front end portion of the bridge crane 12 extends to the front of the installed beam section 3, and after an installation process of one beam section 2 to be installed is completed each time, the bridge crane 12 moves forward to the foremost end of the installed beam section 3.
Further, the straight line transfer device comprises a sliding beam 13 and a supporting frame 14, the sliding beam 13 and the supporting frame 14 are connected with each other, the sliding beam 13 is used for being installed above the installed beam section 3 and can slide along a slideway, and the supporting frame 14 is used for extending to the lower part of the installed beam section 3 and can be connected with the beam section 2 to be installed.
In the present embodiment, the sliding beam 13 and the supporting frame 14 are detachably connected, preferably, the supporting frame 14 is slidably adjustable along the length direction of the sliding beam 13 relative to the sliding beam 13, and the length ratio of the sliding beam 13 to the supporting frame 14 is not less than twice.
When the linear transfer device is used for transferring the beam section 2 to be installed, the support frame 14 is fixed relative to the rear end of the sliding beam 13, the sliding beam 13 slides to the front end of the installed beam section 3 relative to the installed beam section 3 along the slide way, the front end of the sliding beam 13 extends to the front of the installed beam section 3, the extending length of the sliding beam 13 is larger than that of the support frame 14, then the fixing structure between the support frame 14 and the sliding beam 13 is released, the support frame 14 slides to the extending part of the sliding beam 13 along the sliding beam 13, and the beam section 2 to be installed is not shielded by the installed beam section 3 in the vertical direction, so that the beam section 2 to be installed is lifted to the same horizontal height as the installed beam section 3 for installation. Through the structure arrangement, the combined structure of the sliding beam 13 and the supporting frame 14 is utilized to perform two-section horizontal transfer process on the beam section 2 to be installed, the supporting frame 14 and the beam section 2 to be installed do not extend outwards in the process that the sliding beam 13 extends to the front of the installed beam section 3, and after the sliding beam 13 is completely extended and is relatively fixed with the installed beam section 3, the supporting frame 14 is moved to extend the beam section 2 to be installed outwards, so that the stability of the sliding beam 13 and the supporting frame 14 in the process of transferring the beam section 2 to be installed is greatly improved, and the safety in the construction process is improved. In the embodiment, the length ratio of the sliding beam 13 to the supporting frame 14 is not less than twice, so that the sliding beam 13 can be ensured to have enough connecting length with the installed beam section 3 during the extending process, and the connecting stability of the sliding beam 13 and the installed beam section 3 can be ensured.
Further, the second lifting device is provided with a sling 121 for providing traction to the sliding beam 13 when the sliding beam 13 is extended in front of the mounted beam section 3. Through the arrangement of the hanging strip 121, when the sliding beam 13 extends outwards, the sliding beam 13 can be pulled, bending deformation caused by overlarge local stress on the front end of the sliding beam 13 is avoided, and the safety in the beam section splicing process is improved.
In this embodiment, the linear transfer device includes at least one pair of sliding beams 13 and at least one pair of supporting frames 14, the sliding beams 13 and the supporting frames 14 are installed in a one-to-one correspondence, the pair of sliding beams 13 are respectively used for being installed at two ends of the installed beam section 3 in the width direction, and the pair of supporting frames 14 are used for fixing the same beam section 2 to be installed. In this embodiment, the linear transfer device includes a pair of sliding beams 13 and a pair of supporting frames 14, and one sliding beam 13 and one supporting frame 14 are respectively disposed on two sides of the beam section. Through a pair of smooth roof beam 13 and a pair of support frame 14, be connected with the both sides of waiting to install beam section 2, improved the stability of waiting to install beam section 2 transfer in-process.
Further, the support frame 14 includes at least two support bars 141, a connection bar 142 is connected between two adjacent support bars 141, and the support bars 141 are used for being connected with the beam section 2 to be installed and the sliding beam 13. This structure can reduce the use of material, and whole weight reduces, has higher structural strength moreover, can bear the weight of waiting to install beam section 2, ensures to wait to install the stability of beam section 2 transfer in-process.
Further, the supporting frame 14 is a C-shaped beam, the top of the supporting strip 141 is bent toward a side close to the sliding beam 13 to form an upper bent portion 1411, the upper bent portion 1411 is hung on the sliding beam 13, and the upper bent portion 1411 can slide along the length direction of the sliding beam 13 relative to the sliding beam 13. In this embodiment the C-beam and the skid beam 13 are detachably connected to each other, the C-beam being temporarily lockable to the skid beam 13 by means of fasteners and slidable relative to the skid beam 13 after unlocking. The fastening members may be screws, and the locking positions of the C-shaped beam and the slide beam 13 are preferably provided at both ends of the slide beam 13 in the longitudinal direction, and one locking structure is provided at each end of the slide beam 13. In one embodiment, the end of the skid beam 13 may be provided with bolt holes, and the C-shaped beam and the skid beam 13 may be temporarily locked and fixed by fasteners.
The bottom of the support strip 141 is bent towards one side close to the sliding beam 13 to form a lower bent part 1412, and the lower bent part 1412 is used for connecting with the beam section 2 to be installed. That is, the upper and lower ends of the supporting bar 141 are respectively bent toward one side close to the beam section, so that the supporting frame 14 is a C-shaped structure as a whole.
Through such setting, the support frame 14 is whole to be C type structure, and on the one hand, the last kink 1411 at support frame 14 top can be hung and arranged in on smooth roof beam 13, and the gravity of support frame 14 is exerted on the top surface of smooth roof beam 13, and the reliability of being connected of support frame 14 and smooth roof beam 13 is higher, and the difficult emergence of support frame 14 and smooth roof beam 13 is separated, and construction safety is higher. The lower bent portion 1412 at the bottom of the support frame 14 can facilitate connection with the side of the beam section 2 to be installed, thereby reducing the difficulty of assembly.
Further, the side of the support frame 14 close to the sliding beam 13 is provided with a reverse top wheel 143 which can be abutted with the side wall of the mounted beam section 3. The two support frames 14 at both sides of the beam section can be provided with the reverse top wheel 143 only one of them, or the reverse top wheels 143 can be arranged on both the two support frames 14.
Through installing anti-top wheel 143 on the medial surface at support frame 14, anti-top wheel 143 keeps the butt with installed beam section 3, can make smooth beam 13 and support frame 14 difficult emergence in the slip in-process rock, treat the in-process of installing beam section 2 more steady at the transfer.
Further, the bridge deck crane 12 includes a hanger 122, a crane spreader 123 and a driving mechanism (not shown in the figure), the crane spreader 123 is installed at the front end of the hanger 122, the driving mechanism preferably employs a hydraulic pump station, the hydraulic pump station is used for providing power for the lifting of the crane spreader 123, the crane spreader 123 is used for lifting the beam section 2 to be installed, the front end portion of the hanger 122 can extend to the front of the installed beam section 3, so that the crane spreader 123 is suspended in front of the installed beam section 3 and lifts the beam section 2 to be installed, the rear end of the hanger 122 is installed above the installed beam section 3, and the hanger 122 can slide linearly on the installed beam section 3, the hanger 122 can share one slideway with the sliding beam 13, or the hanger 122 and the sliding beam 13 respectively use one slideway independently. When the hanger 122 is used alone with one runner, after each beam section is spliced, the runner behind the deck crane 12 may be removed and mounted in front of the deck crane 12, and the deck crane 2 is moved to the foremost position of the mounted beam section 3.
Referring to fig. 8 to 10, the invention further provides a method for erecting a main girder of a large-span cable-stayed bridge, which comprises the following steps:
constructing a main tower, an auxiliary pier 4 and a transition pier 5, and reserving a preset height between the top of the auxiliary pier 4 and a main beam;
building a tower section beam at the main tower;
installing the main girder erection construction system on the tower area girder section;
after being integrally lifted, the single beam section 2 to be installed is horizontally transferred to the front end of the installed beam section 3 for installation;
repeating the previous step until the main beam is spliced to the auxiliary pier 4;
carrying out height connection construction on the auxiliary piers 4 to connect the auxiliary piers 4 with the main beam;
and repeating the step of horizontally transferring the single beam section 2 to be installed to the front end of the installed beam section 3 after the integral lifting until the main span is closed.
After a main tower, an auxiliary pier 4 and a transition pier 5 are built, a tower section beam is built at the position of the main tower, a beam section 2 to be installed is lifted from the lower side of the tower section beam and then horizontally transferred to the front end of an installed beam section 3 to be spliced until a main beam is closed.
Further, when a tower section is built at the main tower, the method comprises the following steps:
building an initial beam section at a main tower;
building a tower area bracket 6 below the initial beam section;
assembling the tower area support 6 to form a tower area beam section;
installing a stay cable 7 on the beam section of the tower area and tensioning the stay cable 7;
and (4) removing the tower area bracket 6.
Preferably, after the initial beam section is built at the main tower, the bridge deck is installed on the initial beam section, and the wet joint is poured.
Further, after the tower area support 6 is removed, the method further comprises the following steps:
a bridge deck crane 12, a C-shaped beam, a sliding beam 13, a gantry crane 11 and a slideway are arranged on the beam section of the tower area;
and (4) transporting the beam section 2 to be installed to the lower part of a gantry crane 11 beside the cable tower 8. Further, when the single beam section 2 to be installed is horizontally transferred to the front end of the installed beam section 3 for installation after being integrally lifted, the method comprises the following steps:
vertically hoisting the beam section 2 to be installed from the root of the cable tower 8 to the position right below the installed beam section 3;
translating the beam section 2 to be installed to the front of the installed beam section 3 along the bridge direction by using a linear transfer device;
lifting the beam section 2 to be installed, and butting and assembling the beam section 2 to be installed and the front end of the installed beam section 3;
and resetting the linear transfer device.
In this embodiment, the gantry crane 11 is installed beside the cable tower 8, and is used for vertically hoisting the beam segment 2 to be installed to the position right below the installed beam segment 3 from the root of the cable tower 8, and the deck crane 12 is installed at the front end position of the installed beam segment 3, and is used for lifting the beam segment 2 to be installed so as to butt-joint and assemble the beam segment 2 to be installed and the installed beam segment 3.
By arranging the gantry crane 11 beside the cable tower 8, the stability of the support structure of the area beside the cable tower 8 is higher, and the safety of the gantry crane 11 is higher when the beam section is lifted; moreover, when the gantry crane 11 is used for lifting the beam section, the position of the gantry crane 11 needs to be subjected to a load in the vertical direction for a long time, the gantry crane 11 is arranged beside the cable tower 8, the length of a cantilever of the area beside the cable tower 8 is small, and the bridge can be prevented from being deformed due to the influence of the beam section lifting process to a large extent.
In the present embodiment, the installation process of the beam segment 2 to be installed is as follows: the beam section 2 to be installed, which is positioned below the gantry crane 11, is hoisted by a hoisting tool on the gantry crane 11 until the beam section 2 to be installed is away from the tower area by a certain height, and then the beam section 2 to be installed is connected with a linear transfer device, the gantry crane 11 is then loosened to be connected with the beam section 2 to be installed, the beam section 2 to be installed is transferred to a bridge deck crane 12 by the linear transfer device to be installed, the front end part of the bridge deck crane 12 extends outwards, and a hanging-down clamp is used for being connected with the beam section 2 to be installed, hoisting the beam section 2 to be installed and splicing the beam section 3 to be installed.
By adopting the construction method, the beam section 2 to be installed is integrally lifted, integrally transferred and integrally assembled, rather than a construction mode of assembling one by one after transporting parts, the difficulty of aerial splicing operation is reduced, the improvement of the installation precision of the beam section is facilitated, and the construction method is suitable for splicing steel box beams and orthotropic steel beams and has higher applicability. In addition, the whole assembly also has the advantage of ensuring the linear form of the main beam, and the construction quality is improved.
Further, before translating the beam section 2 to be installed to the front of the installed beam section 3 along the bridge direction by using a linear transfer device, the method comprises the following steps:
and respectively connecting two ends of the beam section 2 to be installed in the width direction with two C-shaped beams which are respectively installed at two ends of the installed beam section 3 in the linear transfer device correspondingly.
In this embodiment, two C-shaped beams are adopted to connect with two ends of the beam section 2 to be installed in the width direction, the suspension structure formed by the two C-shaped beams can stably transfer the beam section 2 to be installed without being affected by the installed beam section 3, the structural requirement on the beam section 2 to be installed is low, and the connection with the C-shaped beams can be realized only by arranging the connection structures on two sides of the beam section 2 to be installed, so the assembly is simple, and the construction efficiency is high.
Further, when the beam section 2 to be installed is translated to the front of the installed beam section 3 along the bridge direction by using a linear transfer device, the method comprises the following steps:
the C-shaped beam is driven by a sliding beam 13 in the linear transfer device to move to the front end of the installed beam section 3 along the installed beam section 3, and the front end of the sliding beam 13 extends to the front of the installed beam section 3;
the connection between the C-shaped beam and the sliding beam 13 is released;
and driving the C-shaped beam to drive the beam section 2 to be installed to move to the front end position of the sliding beam 13 along the sliding beam 13.
Further, after the C-shaped beam is moved along the installed beam section 3 to the front end of the installed beam section 3 by the slide beam 13 in the linear transfer device, and the front end of the slide beam 13 is extended to the front of the installed beam section 3, the method further comprises the following steps: the front end of the slide beam 13 is fixed to the deck crane 12 by means of the slings 121.
In the embodiment, in the process of horizontally transferring the beam section 2 to be installed, the C-shaped beam is firstly kept temporarily fixed at the rear end of the sliding beam 13, the C-shaped beam and the sliding beam 13 can be temporarily locked and fixed by fastening bolts, the C-shaped beam and the sliding beam 13 are jointly moved to the front end position, then the C-shaped beam and the sliding beam 13 are fixed at the front end of the sliding beam 13 through the hanging strip 121, meanwhile, the sliding beam 13 is relatively fixed with the installed beam section 3, then the connection between the C-shaped beam and the sliding beam 13 is released, and the C-shaped beam is slid to the front end along the sliding beam 13 until the beam section 2 to be installed is not shielded in the vertical direction. By the construction mode, the stability of the beam section 2 to be installed in the transfer process can be greatly improved, the structures of the sliding beam 13 and the C-shaped beam are not easily damaged, and the construction safety is higher.
Further, when the straight line transfer device is reset, the method comprises the following steps:
the C-shaped beam is moved from the front end position of the sliding beam 13 to the rear end position of the sliding beam 13 and then is fixed with the sliding beam 13;
separating the harness 121 from the slide beam 13;
the sliding beam 13 is moved along the mounted beam section 3 to an initial position, which in this embodiment is the mounting position of the gantry crane 11, while ensuring that the C-beam is located below the gantry crane 11, facilitating the next time the gantry crane 11 is connected to the beam section 2 to be mounted when lifting the beam section 2 to be mounted.
Further, after the beam section 2 to be installed is lifted and assembled and the beam section 2 to be installed and the front end of the installed beam section 3 are butted and assembled, the method further comprises the following steps:
installing corresponding stay cables 7 on the assembled beam sections, and performing first tensioning construction on the stay cables 7; and mounting a bridge deck on the beam section and then performing secondary tensioning construction on the stay cable 7.
Further, before the beam section to be installed is vertically hoisted to be right below the installed beam section from the root of the cable tower, the method comprises the following steps: and one section of the beam section 2 to be installed is adopted as a reference section, and the other section of the beam section 2 to be installed is formed by matching and assembling.
Preferably, in this embodiment, the N beam section is used as a reference section, the N +1 beam section and the N +2 beam section are sequentially formed by matching and assembling along the same installation direction, after the assembling is completed, the connection between the N beam section and the N +1 beam section is released, the N +1 beam section is used as a reference section for the N +2 beam section and the N +3 beam section, and the above steps are repeatedly performed until the assembling of the beam section 2 to be installed is completed. In other embodiments, N beam segments may also be used as reference segments, and one beam segment or more than three beam segments may be formed by matching and assembling.
By the construction method, the whole beam section can be formed on the ground in a matching and assembling mode before the beam section 2 to be installed is lifted, the beam sections are matched in advance, the accuracy of assembling the beam sections after lifting is ensured, and the construction efficiency is improved. In addition, in this embodiment, adopt N roof beam section as the benchmark section, match and assemble N +1 roof beam section and N +2 roof beam section, compare in a roof beam section of matching and assembling department, can detect and control the linear after a plurality of roof beam sections splice in advance before lifting by crane and assembling, guaranteed the linear of girder after the installation of lifting by crane, improved construction precision greatly, promote construction quality.
Further, after the main span closure, the method also comprises the following steps: removing the temporary pier, the gantry crane 11, the bridge deck crane 12, the slideway, the C-shaped beam and the sliding beam 13; constructing the bridge deck; and adjusting the stay cable 7 to meet the construction requirement.
The specific flow of the girder construction method related by the invention is as follows:
the construction of a bridge foundation and a main tower is completed, wherein the pier body of the auxiliary pier 4 is reserved with a certain height and is not constructed, an initial beam section facing a tower area is built, a mounting support is built below the initial beam section, the corresponding beam section is assembled on the mounting support to form the tower area beam section, and a wet joint is poured after a bridge deck is installed. And (5) installing a stay cable 7 at the beam section of the tower area, tensioning, and dismantling the installation support after tensioning is finished. The method comprises the steps that a slideway, a gantry crane 11, a C-shaped beam, a sliding beam 13 and a bridge deck crane 12 are installed on a beam section of a tower area, a beam section 2 to be installed is assembled in a pre-matching mode in an assembling field near a cable tower, and the assembled beam section 2 to be installed is conveyed to the position below the gantry crane 11 beside the cable tower 8. The beam section 2 to be installed is lifted to the position of the C-shaped beam through the gantry crane 11, the sliding beam 13 is moved after being connected with the C-shaped beam to extend the front end of the sliding beam 13, then the sliding beam 13 is fixed with the installed beam section 3, meanwhile, the slide beam 13 is connected with the bridge deck crane 12 through the hanging strip 121, the beam section 2 to be installed moves to the front end of the slide beam 13 through the C-shaped beam, the beam sections 2 to be installed are hoisted by the bridge crane 12 and are spliced and fixed with the installed beam sections 3, the stay cables 7 are installed and tensioned, the bridge crane 12 is moved forwards to the foremost end of the installed beam sections 3, each beam section 2 to be installed is repeatedly spliced until the main beam is spliced to the auxiliary pier 4, the auxiliary piers 4 are connected to be high, so that the main beams are supported by the auxiliary piers 4, the splicing process of the main beams is continued until the main span is closed, and continuing the construction of the side span after the closure of the main span until the closure, wherein the construction of the side span can be prior to the closure of the main span. And (5) dismantling the temporary piers and the assembling platform, constructing the bridge floor, finally adjusting the stay cables 7, and finishing the construction of the main bodies of the stay cables 7.
In summary, the scheme of the invention has the following advantages:
1. in the construction system 1 for erecting the main beam of the large-span cable-stayed bridge, the beam section 2 to be installed is lifted by the first lifting device, then is transferred to the position below the front end of the installed beam section 3 by the linear transfer device, and is lifted by the second lifting device.
2. According to the method for erecting the main beam of the large-span cable-stayed bridge, after a main tower, an auxiliary pier 4 and a transition pier 5 are built, a tower section is built at the position of the main tower, a beam section 2 to be installed is lifted from the lower part of the tower section and then horizontally transferred to the front end of an installed beam section 3 for splicing until the main beam is closed.
3. In the method for erecting the main beam of the large-span cable-stayed bridge, the C-shaped beam and the sliding beam 13 are adopted to be matched, the beam section 2 to be installed is stably transported, the overall structure is simple, the installation operation difficulty is low, the line shape of the main beam is easy to guarantee, and the construction quality of the bridge is improved.
4. According to the method for erecting the main beam of the large-span cable-stayed bridge, the beam section 2 to be installed is subjected to segment matching in advance before being hoisted, the assembling precision is high, the line shape of the main beam is ensured, and the construction quality of the bridge is improved.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for erecting a main girder of a large-span cable-stayed bridge is characterized by comprising the following steps:
constructing a main tower, an auxiliary pier and a transition pier, and reserving a preset height between the top of the auxiliary pier and a main beam;
building a tower section beam at the main tower;
installing a main beam erection construction system on the beam section of the tower area;
after being integrally lifted, a single beam section to be installed is horizontally transferred to the front end of the installed beam section for installation;
repeating the previous step until the main beam is spliced to the auxiliary pier;
carrying out height connection construction on the auxiliary piers to connect the auxiliary piers with the main beam;
and repeating the step of horizontally transferring the single beam section to be installed to the front end of the installed beam section after the integral lifting of the beam section to be installed until the main span is closed.
2. The method for erecting the main girder of the large-span cable-stayed bridge according to the claim 1, which is characterized by comprising the following steps when a tower section is built at a main tower:
building an initial beam section at a main tower;
building a tower area support below the initial beam section;
assembling the tower area support to form a tower area beam section;
installing stay cables on the beam section of the tower area and tensioning the stay cables;
and (5) dismantling the tower area bracket.
3. The method for erecting the main girder of the large-span cable-stayed bridge according to claim 1, wherein when a single beam section to be installed is horizontally transferred to the front end of the installed beam section for installation after being integrally lifted, the method comprises the following steps:
vertically hoisting a beam section to be installed from the root of the cable tower to the position right below the installed beam section;
translating the beam section to be installed to the front of the installed beam section along the bridge direction by using a linear transfer device;
lifting the beam section to be installed, and butting and assembling the beam section to be installed and the front end of the installed beam section;
and resetting the linear transfer device.
4. The method for erecting the main girder of the large-span cable-stayed bridge according to the claim 3, wherein before the beam section to be installed is translated to the front of the installed beam section along the bridge direction by using a straight line transfer device, the method comprises the following steps:
and respectively connecting two ends of the beam section to be installed in the width direction with two C-shaped beams which are installed at two ends of the installed beam section in the linear transfer device correspondingly.
5. The method for erecting the main girder of the large-span cable-stayed bridge according to claim 4, wherein the method comprises the following steps when the beam section to be installed is translated to the front of the installed beam section along the bridge direction by using a straight line transfer device:
the sliding beam in the linear transfer device drives the C-shaped beam to move to the front end of the installed beam section along the installed beam section, and the front end of the sliding beam extends to the front of the installed beam section;
releasing the connection between the C-shaped beam and the sliding beam;
and driving the C-shaped beam to drive the beam section to be installed to move to the front end position of the sliding beam along the sliding beam.
6. The method for erecting a main beam of a cable-stayed bridge with a large span according to claim 5, wherein after the C-shaped beam is driven by the slide beam in the linear transfer device to move along the installed beam section to the front end of the installed beam section and the front end of the slide beam extends out of the front of the installed beam section, the method further comprises the following steps:
the front end of the sliding beam is fixed with the bridge deck crane by the sling.
7. The method for erecting the main girder of the cable-stayed bridge with the large span according to claim 5, wherein the method comprises the following steps when the linear transfer device is reset:
moving the C-shaped beam from the front end position of the sliding beam to the rear end position of the sliding beam and then fixing the C-shaped beam with the sliding beam;
the skid beam is moved to an initial position along the installed beam section.
8. The method for erecting the main beam of the large-span cable-stayed bridge according to claim 3, wherein the method comprises the following steps before the beam section to be installed is vertically hoisted to be right below the installed beam section from the root of the cable tower:
one section of beam section to be installed is used as a reference section, and the beam section to be installed is matched and assembled to form the other section of beam section to be installed.
9. The method for erecting the main girder of the large-span cable-stayed bridge according to claim 8, wherein when one section of the beam section to be installed is used as a reference section and another section of the beam section to be installed is formed by matching and assembling, the method comprises the following steps:
the N beam sections are used as reference sections and are sequentially matched and assembled along the same installation direction to form an N +1 beam section and an N +2 beam section;
the connection between the N beam section and the N +1 beam section is released;
and taking the N +1 beam section as a reference section, and repeatedly executing the steps until the assembly of the beam section to be installed is completed.
10. The method for erecting the main beam of the large-span cable-stayed bridge according to claim 3, wherein the method further comprises the following steps after the beam section to be installed is lifted and assembled with the front end of the installed beam section in a butt joint mode:
installing corresponding stay cables on the assembled beam sections, and performing first tensioning construction on the stay cables;
and (5) mounting a bridge deck on the beam section and then performing secondary tensioning construction on the stay cable.
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Cited By (1)
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| CN114855632A (en) * | 2022-05-31 | 2022-08-05 | 中交路桥建设有限公司 | Steel-concrete composite beam cable-stayed bridge construction system and steel-concrete composite beam construction method |
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