CN114232488B - Method for erecting main girder of large-span cable-stayed bridge - Google Patents
Method for erecting main girder of large-span cable-stayed bridge Download PDFInfo
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- CN114232488B CN114232488B CN202111539826.1A CN202111539826A CN114232488B CN 114232488 B CN114232488 B CN 114232488B CN 202111539826 A CN202111539826 A CN 202111539826A CN 114232488 B CN114232488 B CN 114232488B
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- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000010276 construction Methods 0.000 claims abstract description 65
- 238000009434 installation Methods 0.000 claims abstract description 22
- 230000007704 transition Effects 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 description 14
- 238000005452 bending Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
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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
-
- 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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- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a main girder erection method of a large-span cable-stayed bridge, which is characterized by comprising 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 area beam section at the main tower; installing a girder erection construction system on the tower section girder section; the single beam Duan Zhengti to be installed is lifted and horizontally transferred to the end of the installed beam Duan Qian 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 enable the auxiliary piers to be connected with the main beams; the step of lifting the single beam Duan Zhengti to be installed and then horizontally transferring it to the installed end of the beam Duan Qian for installation is repeated until the main span is closed. The beam section is integrally installed in the construction method, the assembly precision is high, the girder line shape is easy to ensure, the construction quality of the bridge is high, and the construction speed is faster.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a method for erecting a girder of a large-span cable-stayed bridge.
Background
In the bridge construction process, the conditions such as topography, navigation or existing property units under the field are limited under the bridge, and the girder segments do not have direct vertical lifting installation conditions, so that the construction of the girder is difficult. The existing construction process for splicing the cantilever of the bridge deck crane generally adopts the construction process, but the construction method requires that the girder steel structure is an orthotropic girder steel, the orthotropic girder steel is generally composed of main longitudinal beams, cross beams, small longitudinal beams and other components, and all the components are transported to the bridge deck crane to be spliced one by one, so that the splicing speed of the construction method is slower, and the girder line shape is not easy to guarantee.
Disclosure of Invention
The invention aims to provide a girder erection method of a large-span cable-stayed bridge, which can improve girder assembly construction speed and ensure girder line type.
In order to achieve the above object, the present invention provides the following technical solutions:
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, wherein a preset height is reserved between the top of the auxiliary pier and a main girder;
building a tower area beam section at the main tower;
installing a girder erection construction system on the tower section girder section;
the single beam Duan Zhengti to be installed is lifted and horizontally transferred to the end of the installed beam Duan Qian 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 enable the auxiliary piers to be connected with the main beams;
the step of lifting the single beam Duan Zhengti to be installed and then horizontally transferring it to the installed end of the beam Duan Qian for installation is repeated until the main span is closed.
Further, when building a tower section beam section at the main tower, the method comprises the following steps:
constructing an initial beam section at the main tower;
constructing tower area brackets on the initial beams Duan Xiafang;
splicing the tower area support to form a tower area beam section;
installing stay cables on the tower area beam section and tensioning the stay cables;
and (5) dismantling the tower area support.
Further, when the single beam Duan Zhengti to be installed is lifted and horizontally transferred to the installed beam Duan Qian end for installation, the method comprises the following steps:
vertically lifting the beam section to be installed from the root of the cable tower to the position right below the installed beam section;
translating the front of the installed beam segment of the beam Duan Zhi to be installed along the forward bridge using a linear translation device;
lifting the beam section to be installed, and butt-jointing and splicing the beam section to be installed and the front end of the installed beam section;
resetting the linear transfer device.
Further, before translating the to-be-installed beam Duan Zhi in the forward bridge direction with the linear translation device, the installed beam Duan Qianfang includes the steps of:
and connecting the two ends of the beam Duan Kuandu to be installed with two C-shaped beams of the linear transfer device, which are respectively installed at the two ends of the installed beam Duan Kuandu.
Further, when translating the front of the installed beam segment of the beam Duan Zhi to be installed in the forward bridge direction using a linear translation device, the method comprises the steps of:
driving the C-shaped beam to move to the front end of the installed beam section along the installed beam section by means of the sliding beam in the linear transfer device, and enabling the front end of the sliding beam to extend to the front of the installed beam section;
releasing the connection between the C-shaped beam and the sliding beam;
the C-shaped beam is driven 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 is used for driving 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, the method further comprises the following steps:
the front end of the sliding beam is fixed with the bridge deck crane by means of the hanging belt.
Further, when resetting the linear transfer device, the method comprises the following steps:
the C-shaped beam is fixed with the sliding beam after moving from the front end position of the sliding beam to the rear end position of the sliding beam;
the skid beam is moved along the installed beam section to an initial position.
Further, before the beam section to be installed is lifted vertically from the root of the rope tower to directly below the installed beam section, the method comprises the following steps:
and adopting one section of beam section to be installed as a reference section, and matching and assembling to form the other section of beam section to be installed.
Further, when a section of the beam section to be installed is adopted 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 adopted as reference sections, and are sequentially matched and spliced along the same installation direction to form an N+1 beam section and an N+2 beam section;
removing the connection between the N beam section and the N+1 beam section;
and taking the N+1 beam section as a reference section, and repeatedly executing the steps until the required assembly of the beam section to be installed is completed.
Further, after lifting the beam section to be installed and butt-jointing and splicing the beam section to be installed and the front end of the installed beam section, the method further comprises the following steps:
installing corresponding stay cables on the assembled beam section, and carrying out first tensioning construction on the stay cables;
and (5) carrying out second tensioning construction on the stay cable after installing the bridge deck on the beam section.
Compared with the prior art, the scheme of the invention has the following advantages:
1. in the method for erecting the main girder 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, the lower part of the section of the girder Duan Youda to be installed is lifted and horizontally transferred to the end of the installed girder Duan Qian for splicing until the main girder is closed, and the girder section is integrally installed in the construction method, so that the splicing precision is high, the girder line shape is easy to ensure, the construction quality of the bridge is high, and the construction speed is higher.
2. In the method for erecting the main girder of the large-span cable-stayed bridge, the matched structure of the C-shaped girder and the sliding girder is adopted, the girder section to be installed is stably transported, the whole structure is simpler, the installation operation difficulty is low, the main girder line shape is easy to ensure, and the bridge construction quality 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 invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a front view of a girder erection construction system of a large-span cable-stayed bridge in an embodiment of the present invention;
FIG. 2 is a schematic view of a door crane lifting a girder section to be installed in a girder erection construction system of a large-span cable-stayed bridge according to an embodiment of the present invention;
FIG. 3 is a schematic view of a door hanger lifting a beam section to be installed in an embodiment of the present invention;
FIG. 4 is a schematic illustration of a skid beam transferring a beam section to be installed to an end position of an installed beam Duan Qian in accordance with one embodiment of the invention;
FIG. 5 is a schematic view of a C-beam transferring a beam section to be installed to below a deck crane in one embodiment of the invention;
FIG. 6 is a schematic illustration of a bridge deck crane lifting a beam section to be installed in accordance with one 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 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 diagram of a girder erection process in an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in fig. 1 to 7, the present invention provides a girder erection construction system 1 for a cable-stayed bridge with a large span, which comprises a first lifting device, a slideway (not shown in the drawings), a linear transfer device and a second lifting device, wherein the first lifting device is used for lifting a girder section 2 to be installed to the position of the linear transfer device, the slideway is used for providing a moving guide for the linear transfer device, the linear transfer device is used for transferring the girder section 2 to be installed from the first lifting device to the position of the second lifting device, and the second lifting device is used for being installed at the front end position of the girder section 3 to be installed and can lift the girder section 2 to be installed to a specified height to splice with the girder section 3 to be installed.
The beam section 2 to be installed is lifted by the first lifting device, then is transferred to the lower part of the front end position of the installed beam section 3 by the linear transfer device, and is lifted by the second lifting device, and the beam section can be assembled in advance and then lifted for installation by adopting the construction system, so that parts are not required to be transferred to a bridge deck for assembly, the main beam installation difficulty is reduced, the main beam linearity is ensured, and the construction speed is also accelerated. The construction system is suitable for girder systems needing pre-assembly, such as orthotropic girder systems, steel box girders, superposed girder systems and the like.
In this embodiment, the first lifting device is a gantry crane 11, the gantry crane 11 is installed at a beam section adjacent to the main tower area, the second lifting device is a bridge deck crane 12, the bridge deck crane 12 is installed at the front end position of the installed beam section 3, the front end part of the bridge deck crane 12 extends to the front of the installed beam section 3, and after each installation procedure of one beam section 2 to be installed is completed, the bridge deck crane 12 moves forward to the foremost end of the installed beam section 3.
Further, the linear transfer device comprises a slide 13 and a support frame 14, the slide 13 and the support frame 14 are connected with each other, the slide 13 is arranged above the installed beam section 3 and can slide along a slideway, and the support frame 14 is arranged below the installed beam section 3 and can be connected with the beam section 2 to be installed.
In this embodiment, the sliding beam 13 and the supporting frame 14 are detachably connected, preferably, the supporting frame 14 is slidably adjustable relative to the sliding beam 13 along the length direction of the sliding beam 13, and the length ratio of the sliding beam 13 to the supporting frame 14 is not less than two times.
When the linear transfer device transfers the beam section 2 to be installed, the support frame 14 is relatively fixed with the rear end of the sliding beam 13, the sliding beam 13 slides to the front end of the installed beam section 3 along the slideway relative to the installed beam section 3, 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 the length of the support frame 14, 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 blocked by the installed beam section 3 in the vertical direction, so that the beam section 2 to be installed is conveniently lifted to be installed at the same horizontal height as the installed beam section 3. Through such structure setting, utilize the integrated configuration of slide beam 13 and support frame 14, carry out two sections horizontal transfer processes to the roof beam section 2 that wait to install, in the in-process that slide beam 13 stretches out to the roof beam section 3 place ahead that has been installed, support frame 14 and wait to install roof beam section 2 do not outwards stretch out, and when slide beam 13 stretches out and after fixed relatively with the roof beam section 3 that has been installed, the support frame 14 will wait to install roof beam section 2 outwards stretch out again, this process has improved slide beam 13 and support frame 14 greatly and has been in the stability of transferring the in-process of waiting to install roof beam section 2, thereby the security in the work progress has been promoted. In this 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 have a sufficient connection length with the installed beam section 3 in the extending process, and the connection stability of the sliding beam 13 and the installed beam section 3 can be ensured.
Further, the second hoisting means is provided with a sling 121 for providing traction for the skid beam 13 when the skid beam 13 is extended in front of the installed beam section 3. Through setting up suspender 121, can pull slide beam 13 when slide beam 13 outwards stretches out, avoid slide beam 13 front end local atress too big and take place to bend the deformation, promote the security of roof beam Duan Pinjie in-process.
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 slide beams 13 and a pair of support frames 14, and one slide beam 13 and one support frame 14 are respectively disposed on each side of the beam section. The stability of the beam section 2 to be installed in the transferring process is improved by connecting the two sides of the beam section 2 to be installed through the pair of sliding beams 13 and the pair of supporting frames 14.
Further, the supporting frame 14 includes at least two supporting bars 141, and a connecting bar 142 is connected between two adjacent supporting bars 141, and the supporting bars 141 are used for connecting with the beam section 2 to be installed and the sliding beam 13. The structure can reduce the use of materials, reduce the overall weight, has higher structural strength, can bear the weight of the beam section 2 to be installed, and ensures the stability of the beam section 2 to be installed in the transferring process.
Further, the supporting frame 14 is a C-shaped beam, the top of the supporting bar 141 is bent towards the side close to the sliding beam 13 to form an upper bending portion 1411, the upper bending portion 1411 is hung on the sliding beam 13, and the upper bending 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 slide beam 13 are detachably connected to each other, the C-beam can be temporarily locked with the slide beam 13 by means of a fastener, and the C-beam can slide with respect to the slide beam 13 after unlocking. The fastening members may be screws, and the locking positions of the C-beam and the slide beam 13 are preferably arranged at two ends of the slide beam 13 in the length direction, and a locking structure is arranged at each of the two ends of the slide beam 13. In one embodiment, bolt holes may be provided at the ends of the skid beams 13, and fasteners may be used to temporarily lock and secure the C-beams to the skid beams 13.
The bottom of the supporting bar 141 is bent towards the side close to the sliding beam 13 to form a lower bending part 1412, and the lower bending 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 the adjacent beams Duan Yice, so that the supporting frame 14 has a C-shaped structure as a whole.
Through such setting, support frame 14 wholly is C type structure, on the one hand, and the upper bending part 1411 at support frame 14 top can hang and place on the slide beam 13, and on the top surface of slide beam 13 is applyed to the gravity of support frame 14, and support frame 14 and slide beam 13's connection reliability is higher, and support frame 14 and slide beam 13 are difficult for taking place the separation, and the construction safety is higher. The lower bending part 1412 at the bottom of the supporting frame 14 can be conveniently connected with the side surface of the beam section 2 to be installed, so that the assembling difficulty is reduced.
Further, the side of the support frame 14 near the sliding beam 13 is provided with a counter top wheel 143 which can be abutted with the side wall of the installed beam section 3. The two support brackets 14 on the beam Duan Liangce may have only one of the counter-top wheels 143, or the counter-top wheels 143 may be provided on both support brackets 14.
By mounting the anti-top wheel 143 on the inner side of the support frame 14, the anti-top wheel 143 is kept in abutment with the mounted beam section 3, so that the sliding beam 13 and the support frame 14 are not easy to shake in the sliding process, and the process of transferring the beam section 2 to be mounted is more stable.
Further, the bridge deck crane 12 includes a hanger 122, a crane hanger 123 and a driving mechanism (not shown in the figure), the crane hanger 123 is mounted at the front end of the hanger 122, the driving mechanism preferably adopts a hydraulic pump station, the hydraulic pump station is used for providing power for lifting and lowering the crane hanger 123, the crane hanger 123 is used for lifting and lowering the beam section 2 to be mounted, the front end portion of the hanger 122 can extend to the front of the mounted beam section 3, so that the crane hanger 123 is suspended in front of the mounted beam section 3 and lifts and lowers the beam section 2 to be mounted, the rear end of the hanger 122 is mounted above the mounted beam section 3, the hanger 122 can slide linearly on the mounted beam section 3, the hanger 122 can share one slide with the slide beam 13, or the hanger 122 and the slide beam 13 can use one slide independently. When hanger 122 is used with one skid alone, after each splice is completed with one beam section, the skid behind deck crane 12 can be removed and installed in front of deck crane 12 and deck crane 2 moved to the forward most position of installed beam section 3.
The invention also provides a girder erection method of the large-span cable-stayed bridge, which is shown in the figures 8 to 10, and comprises the following steps:
constructing a main tower, an auxiliary pier 4 and a transition pier 5, wherein a preset height is reserved between the top of the auxiliary pier 4 and the main girder;
building a tower area beam section at the main tower;
installing the main girder erection construction system on a tower section girder section;
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;
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 enable the auxiliary piers 4 to be connected with the main beams;
the step of horizontally transferring the single beam section 2 to be installed to the front end of the installed beam section 3 for installation after the whole body of the beam section 2 to be installed is repeatedly executed until the main span is closed.
After the main tower, the auxiliary piers 4 and the transition piers 5 are built, a tower area beam section is built at the position of the main tower, the beam section 2 to be installed is lifted from the lower part of the tower area beam section and then horizontally transferred to the front end of the installed beam section 3 for splicing until the main beam is closed, the beam section is integrally installed in the construction method, the splicing precision is high, the main beam line shape is easy to ensure, the bridge construction quality is high, and the construction speed is faster.
Further, when building a tower section beam section at the main tower, the method comprises the following steps:
constructing an initial beam section at the main tower;
constructing tower area brackets 6 on the initial beams Duan Xiafang;
splicing the tower area brackets 6 to form a tower area beam section;
installing stay ropes 7 on the tower section beam section and tensioning the stay ropes 7;
and removing the tower area bracket 6.
Preferably, after the initial beam section is set up at the main tower, a bridge deck is installed on the initial beam section, and a wet joint is poured.
Further, after removing the tower section support 6, the method further comprises the following steps:
a bridge deck crane 12, a C-shaped beam, a sliding beam 13, a door hanger 11 and a slideway are arranged on the beam section of the tower area;
the beam section 2 to be installed is transported under the 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 lifted integrally, the method comprises the following steps:
vertically lifting 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 forward bridge by using a linear transfer device;
lifting the beam section 2 to be installed, and butt-jointing and splicing the beam section 2 to be installed and the front end of the installed beam section 3;
resetting the linear transfer device.
In this embodiment, the gantry crane 11 is installed beside the cable tower 8, and is used for vertically lifting 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, and the bridge deck crane 12 is installed at the front end position of the installed beam section 3, and is used for lifting the beam section 2 to be installed to enable the beam section 2 to be installed to be spliced with the installed beam section 3 in a butt joint manner.
By arranging the gantry crane 11 beside the cable tower 8, the stability of the supporting structure of the area beside the cable tower 8 is higher, and the safety of the gantry crane 11 is higher when the girder section is lifted; moreover, as the gantry crane 11 is required to bear the load in the vertical direction for a long time at the position of the gantry crane 11 when the beam section is lifted, the gantry crane 11 is arranged beside the cable tower 8, the cantilever length of the area beside the cable tower 8 is smaller, and the bridge can be prevented from being deformed to a greater extent due to the influence of the process of lifting the beam section.
In this embodiment, the installation process of the beam section 2 to be installed is as follows: the beam section 2 to be installed, which is positioned below the gantry crane 11, is lifted up to a position which is at a certain height from the beam section in the tower area through a lifting appliance on the gantry crane 11, then is connected with a linear transfer device, the gantry crane 11 is 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 through the linear transfer device to be installed, the front end part of the bridge deck crane 12 extends outwards, and a falling clamp is used for being connected with the beam section 2 to be installed, and the beam section 2 to be installed is lifted up and spliced with 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, instead of the construction mode of assembling one by one after conveying the parts, the difficulty of overhead splicing operation is reduced, the installation precision of the beam section is also facilitated to be improved, and the construction method is not only suitable for splicing steel box girders, but also suitable for splicing orthotropic steel girders, and has higher applicability. In addition, the integral assembly has the advantage of ensuring the line type of the main beam and improves the construction quality.
Further, before translating the beam section 2 to be installed in forward bridge direction to the front of the installed beam section 3 by means of a linear transfer device, the method comprises the following steps:
and connecting the two ends of the beam section 2 to be installed in the width direction with two C-shaped beams which are respectively installed at the two ends of the installed beam section 3 in the width direction in the linear transfer device.
In this embodiment, two C-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-beams can stably transfer the beam section 2 to be installed, the influence of the installed beam section 3 is avoided, the structural requirement on the beam section 2 to be installed is low, the connection with the C-beams can be realized only by arranging connection structures on two sides of the beam section 2 to be installed, the assembly is simple, and the construction efficiency is high.
Further, when translating the beam section 2 to be installed to the front of the installed beam section 3 in the forward bridge direction using a linear transfer device, the method comprises the following steps:
the sliding beam 13 in the linear transfer device is used for driving the C-shaped beam 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;
releasing the connection between the C-shaped beam and the sliding beam 13;
the C-shaped beam is driven 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 sliding beam 13 in the linear transfer device is used to drive the C-shaped beam to move along the installed beam section 3 to the front end of 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 method further comprises the following steps: the front end of the skid beam 13 is fixed to the deck crane 12 by means of a sling 121.
In this embodiment, during the horizontal transfer of the beam section 2 to be installed, the C-beam is first kept temporarily fixed at the rear end of the slide beam 13, the C-beam and the slide beam 13 may be temporarily locked and fixed by fastening bolts, the C-beam and the slide beam 13 are jointly moved to the front end position, and then fixed to the front end of the slide beam 13 by the hanging strip 121, and at the same time, the slide beam 13 is relatively fixed to the installed beam section 3, and then the connection between the C-beam and the slide beam 13 is released, so that the C-beam slides along the slide beam 13 to the front end until the beam section 2 to be installed is not blocked in the vertical direction. By the construction mode, the stability of the beam section 2 to be installed in the transferring process can be greatly improved, the structures of the sliding beam 13 and the C-shaped beam are not easy to damage, and the construction safety is higher.
Further, when resetting the linear transfer device, the method comprises the following steps:
the C-shaped beam is fixed with the sliding beam 13 after moving from the front end position of the sliding beam 13 to the rear end position of the sliding beam 13;
separating the sling 121 from the skid beam 13;
the slide beam 13 is moved along the installed beam section 3 to an initial position, in this embodiment the installation position of the gantry crane 11, while ensuring that the C-beam is below the gantry crane 11, facilitating the connection of the next gantry crane 11 with the beam section 2 to be installed when the beam section 2 to be installed is lifted.
Further, after lifting the beam section 2 to be installed and splicing the beam section 2 to be installed and the front end of the installed beam section 3, the method further comprises the following steps:
installing corresponding stay cables 7 on the assembled beam section, and performing first tensioning construction on the stay cables 7; and (5) performing second tensioning construction on the stay cable 7 after installing the bridge deck on the beam section.
Further, before the beam section to be installed is lifted vertically from the root of the rope tower to directly below the installed beam section, the method comprises the following steps: and a section of the beam section 2 to be installed is adopted as a reference section, and the beam section 2 to be installed is formed by matching and assembling.
Preferably, in this embodiment, the N beam sections are adopted as reference sections, and the n+1 beam section and the n+2 beam section are formed by sequentially matching and assembling along the same installation direction, after assembling, the connection between the N beam section and the n+1 beam section is released, the n+1 beam section is adopted as the reference section of the n+2 and the n+3 beam sections, and the above steps are repeatedly executed until the assembling of the beam section 2 to be installed is completed. In other embodiments, N beam segments may 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 section is matched in advance, the accuracy of the beam section in assembling after lifting is ensured, and the construction efficiency is improved. In addition, in the embodiment, the N beam sections are adopted as the reference sections, the N+1 beam sections and the N+2 beam sections are matched and assembled, compared with one beam section at the matched and assembled position, the alignment of the beams Duan Pinjie can be detected and controlled in advance before hoisting and assembling, the alignment of the main beam after hoisting and installing is ensured, the construction precision is greatly improved, and the construction quality is improved.
Further, after the main span closure, the method further comprises the following steps: removing temporary piers, removing door cranes 11, bridge deck cranes 12, sliding ways, C-shaped beams and sliding beams 13; constructing the bridge deck; the stay cable 7 is adjusted to meet the construction requirements.
The girder construction method provided by the invention comprises the following specific processes:
and (3) completing construction of a bridge foundation and a main tower, wherein the pier body of the auxiliary pier 4 is reserved to a certain height, the construction is not performed, an initial beam section of a temporary tower area is built, an installing support is built on the initial beam Duan Xiafang, a beam section of a corresponding beam Duan Xingcheng tower area is assembled on the installing support, and a wet joint is poured after a bridge deck is installed. And installing stay ropes 7 on the tower section beam section, tensioning, and removing the installation support after tensioning is finished. The girder section 2 to be installed is pre-matched and assembled in an assembling field near the cable tower, and the assembled girder 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 a C-shaped beam through a gantry crane 11, the sliding beam 13 is moved after being connected with the C-shaped beam to enable the front end of the sliding beam 13 to extend, the sliding beam 13 is fixed with the installed beam section 3, meanwhile, the sliding beam 13 is connected with a bridge deck crane 12 through a hanging strap 121, the front end of the sliding beam 13 in the movement of the beam section 2 to be installed is lifted and spliced and fixed with the installed beam section 3 through the bridge deck crane 12, a stay cable 7 is installed and tensioned, the bridge deck crane 12 is moved forward to the foremost end of the installed beam section 3, the splicing of the beam sections 2 to be installed is repeated until the main beam is spliced to an auxiliary pier 4, the auxiliary pier 4 is subjected to height splicing construction, the main beam is supported by the auxiliary pier 4 until a main span is closed, the construction of the side span is continued until the main span is closed, and the construction of the side span is advanced until the main span is closed. And (3) removing the temporary piers and the assembly platform, constructing the bridge deck, and finally adjusting the stay cable 7, wherein the construction of the main body of the stay cable 7 is completed.
In summary, the scheme of the invention has the following advantages:
1. in the girder erection construction system 1 of the large-span cable-stayed bridge, the girder section 2 to be installed is lifted by the first lifting device and then is transferred to the lower part of the front end position of the installed girder section 3 by the linear transfer device, and is lifted by the second lifting device.
2. In the method for erecting the main girder of the large-span cable-stayed bridge, after a main tower, an auxiliary pier 4 and a transition pier 5 are built, a tower area girder section is built at the position of the main tower, the girder section 2 to be installed is lifted from the lower part of the tower area girder section and then horizontally transferred to the front end of the installed girder section 3 for splicing until the main girder is closed, the girder section is integrally installed in the construction method, the splicing precision is high, the line shape of the main girder is easy to ensure, the construction quality of the bridge is high, and the construction speed is faster.
3. In the method for erecting the main girder of the large-span cable-stayed bridge, the matched structure of the C-shaped girder and the sliding girder 13 is adopted, the girder section 2 to be installed is stably transported, the whole structure is simpler, the installation operation difficulty is low, the main girder line shape is easy to ensure, and the bridge construction quality is improved.
4. In the method for erecting the main girder of the large-span cable-stayed bridge, the girder segments are subjected to segment matching in advance before the girder segment 2 to be installed is lifted, so that the assembly precision is high, the main girder linearity is ensured, and the bridge construction quality is improved.
The foregoing is only a partial embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (9)
1. The method for erecting the main girder of the large-span cable-stayed bridge is characterized by comprising 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 a main girder;
building a tower area beam section at the main tower;
installing a girder erection construction system on the tower section girder section;
the single beam Duan Zhengti to be installed is lifted and horizontally transferred to the end of the installed beam Duan Qian for installation; vertically lifting the beam section to be installed from the root of the cable tower to the position right below the installed beam section; translating the front of the installed beam segment of the beam Duan Zhi to be installed along the forward bridge using a linear translation device; lifting the beam section to be installed, and butt-jointing and splicing the beam section to be installed and the front end of the installed beam section; resetting the linear transfer device; the linear transfer device comprises a sliding beam and a C-shaped beam, wherein the sliding beam and the C-shaped beam are connected with each other, the sliding Liang Yongyu is arranged above the installed beam section and slides along the slideway, and the C-shaped beam is used for extending below the installed beam section and connecting with the beam section to be installed;
repeating the previous step until the main beam is spliced to the auxiliary pier;
carrying out height connection construction on the auxiliary piers to enable the auxiliary piers to be connected with the main beams;
the step of lifting the single beam Duan Zhengti to be installed and then horizontally transferring it to the installed end of the beam Duan Qian for installation is repeated until the main span is closed.
2. The method for erecting a main girder of a cable-stayed bridge with a large span according to claim 1, comprising the following steps when constructing a girder section of a tower at a main tower:
constructing an initial beam section at the main tower;
constructing tower area brackets on the initial beams Duan Xiafang;
splicing the tower area support to form a tower area beam section;
installing stay cables on the tower area beam section and tensioning the stay cables;
and (5) dismantling the tower area support.
3. A method of erecting a main girder of a large span cable-stayed bridge according to claim 1, characterized by the steps of, before translating the installed girder Duan Qianfang of the to-be-installed girder Duan Zhi in a forward bridge direction using a linear transfer device:
and connecting the two ends of the beam Duan Kuandu to be installed with two C-shaped beams of the linear transfer device, which are respectively installed at the two ends of the installed beam Duan Kuandu.
4. A method of erecting a main girder of a cable-stayed bridge with a large span according to claim 3, characterized by comprising the steps of, when translating the front of the installed girder segment of the girder Duan Zhi to be installed in the forward direction by means of a linear transfer device:
driving the C-shaped beam to move to the front end of the installed beam section along the installed beam section by means of the sliding beam in the linear transfer device, and enabling the front end of the sliding beam to extend to the front of the installed beam section;
releasing the connection between the C-shaped beam and the sliding beam;
the C-shaped beam is driven to drive the beam section to be installed to move to the front end position of the sliding beam along the sliding beam.
5. The method for erecting a main girder of a cable-stayed bridge with a large span according to claim 4, wherein after the C-beam is driven to move along the installed girder section to the front end of the installed girder section by means of the sliding beam in the linear transfer device and the front end of the sliding beam is extended to the front of the installed girder section, the method further comprises the steps of:
the front end of the sliding beam is fixed with the bridge deck crane by means of the hanging belt.
6. The method for erecting a main girder of a cable-stayed bridge with a large span according to claim 4, wherein when the linear transfer device is reset, the method comprises the following steps:
the C-shaped beam is fixed with the sliding beam after moving from the front end position of the sliding beam to the rear end position of the sliding beam;
the skid beam is moved along the installed beam section to an initial position.
7. A method of erecting a main girder of a large span cable-stayed bridge according to claim 1, characterized by the steps of, before vertically lifting the girder section to be installed from the root of the pylon to directly below the installed girder section:
and adopting one section of beam section to be installed as a reference section, and matching and assembling to form the other section of beam section to be installed.
8. The method for erecting a main girder of a cable-stayed bridge with a large span according to claim 7, wherein when a girder section to be installed is adopted as a reference section, and another girder section to be installed is formed by matching and assembling, the method comprises the following steps:
the N beam sections are adopted as reference sections, and are sequentially matched and spliced along the same installation direction to form an N+1 beam section and an N+2 beam section;
removing the connection between the N beam section and the N+1 beam section;
and taking the N+1 beam section as a reference section, and repeatedly executing the steps until the required assembly of the beam section to be installed is completed.
9. The method for erecting a main girder of a cable-stayed bridge with a large span according to claim 1, further comprising the following steps after lifting the girder section to be installed and butt-jointing the girder section to be installed with the front end of the installed girder section:
installing corresponding stay cables on the assembled beam section, and carrying out first tensioning construction on the stay cables;
and (5) carrying out second tensioning construction on the stay cable after installing the bridge deck on the beam section.
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