CN111424556A - Method for erecting main beam of cable-stayed bridge and main beam of cable-stayed bridge - Google Patents
Method for erecting main beam of cable-stayed bridge and main beam of cable-stayed bridge Download PDFInfo
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- CN111424556A CN111424556A CN202010317545.0A CN202010317545A CN111424556A CN 111424556 A CN111424556 A CN 111424556A CN 202010317545 A CN202010317545 A CN 202010317545A CN 111424556 A CN111424556 A CN 111424556A
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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Abstract
The application discloses an erection method of a main beam of a cable-stayed bridge and the main beam of the cable-stayed bridge, which relate to the technical field of bridge construction, and the erection method comprises the following steps: step 1: prefabricating a plurality of section steel beam assemblies; step 2: moving the bridge deck crane on the erected segmental beam; and step 3: sequentially hoisting two sections of steel beam assemblies on a cantilever of the erected section beam by using a bridge deck crane to form two connected section steel beams, connecting the section steel beams with a main tower of the cable-stayed bridge through stay cables after each section steel beam is formed, and primarily tensioning the stay cables; and 4, step 4: hoisting the prefabricated concrete bridge deck on the two segmental steel beams by using a bridge deck crane; and 5: pouring wet joints between concrete bridge decks, tensioning the stay cables on the two sections again, and moving a bridge deck crane towards the newly erected section beams when erection of the two section beams is completed; step 6: and repeating the steps 2-5 until all the sections are erected. The method and the device can accelerate the erection speed of the main beam of the cable-stayed bridge and shorten the beam erection period.
Description
Technical Field
The application relates to the technical field of bridge construction, in particular to an erection method of a main beam of a cable-stayed bridge and the main beam of the cable-stayed bridge.
Background
With the rapid development of economy, the construction speed of bridges is also increasing day by day, and the conventional erection of main beams of cable-stayed bridges comprises a cantilever splicing method, wherein a bridge is erected by utilizing a bridge deck crane section by section, and the bridge is usually built by a whole-section splicing method or a part splicing method in the hoisting process, wherein the whole-section splicing method is to integrally hoist a segmental combination beam, and the part splicing method is to firstly hang and splice parts of steel beams and then hoist bridge decks on the hung and spliced steel beams.
In the traditional construction of the steel-concrete combination beam of the cable-stayed bridge, single-section circulating cantilever parts are often assembled and erected, specifically, a section of steel beam is firstly installed, then a section of bridge deck is hoisted on the section of steel beam, wet joint construction is carried out, and after the concrete strength meets the design requirement, a stay cable is tensioned, so that the construction of the section of combination beam is completed. However, in the method for erecting the circulating cantilever parts in the assembled manner, the time for shifting the bridge crane and maintaining the wet joints in the construction clearance period of the two segmental composite beams accounts for a higher construction period than the construction period in the erection construction of the composite beams, so that the construction period of the assembling and erecting of the circulating cantilever parts is long and the construction efficiency is low.
Disclosure of Invention
The embodiment of the application provides an erection method of cable-stay bridge girder, can accelerate the erection speed of cable-stay bridge girder to shorten the beam erection cycle, reduce the requirement to the bridge floor loop wheel machine, improve the utilization ratio of bridge floor loop wheel machine.
In a first aspect, an embodiment of the present application provides a method for erecting a main beam of a cable-stayed bridge, where the main beam of the cable-stayed bridge is a steel-concrete composite beam, and the method includes the following steps:
step 1: prefabricating a plurality of section steel girder assemblies, wherein each section steel girder assembly comprises two main longitudinal girders, a plurality of cross girders and a plurality of secondary longitudinal girders;
step 2: moving the bridge deck crane on the erected segmental beam;
and step 3: sequentially hoisting two sections of steel beam assemblies on a cantilever of the erected section beam by using the bridge deck crane to form two connected sections of steel beams, connecting the sections of steel beams with a main tower of the cable-stayed bridge through stay cables after each section of steel beam is formed, and primarily tensioning the stay cables;
and 4, step 4: hoisting a plurality of prefabricated concrete bridge deck boards on the two segmental steel beams by using the bridge deck crane;
and 5: pouring a plurality of wet joints among the concrete bridge deck boards, tensioning all the stay cables on the two segmental steel beams again when the strength of the wet joints at least reaches the preset design strength, and moving the bridge deck crane towards the newly erected segmental beam when the erection of the two segmental beams is finished;
step 6: and repeating the steps 2-5 until all the sections are erected.
In some embodiments, preferably, the lifting amplitude of the deck crane is substantially the same as the length of both of the segment beams.
Preferably, in step 2, the first erected segment is erected on the main tower of the cable-stayed bridge.
Preferably, two of said section girders define a first section girder adjacent to said erected section girder and a second section girder remote from said erected section girder; the specific steps of the step 4 are as follows:
step 401: hoisting a plurality of prefabricated concrete bridge deck boards on the first section of steel girder from near to far by using the bridge deck crane;
step 402: placing a plurality of the concrete deck slabs to be hoisted on the first section of steel girder;
step 403: and hoisting a plurality of concrete bridge deck boards to be hoisted on the second section of steel girder from near to far in sequence by using the bridge deck crane.
Preferably, the step 401 is performed while the second section of steel girder is erected in the step 3.
Preferably, the bridge crane is used for hoisting a plurality of concrete bridge deck boards on the second section of steel girder from near to far in sequence.
Preferably, the bridge deck crane is located at the cantilever end during hoisting.
Preferably, the step 3 further comprises:
and moving the section steel beam assembly below a position to be hoisted, and hoisting the section steel beam assembly from the position below by using the bridge deck crane.
Preferably, the main girder of the cable-stayed bridge is erected in sequence from the main tower of the cable-stayed bridge to two sides symmetrically.
In a second aspect, an embodiment of the present application further provides a main beam of a cable-stayed bridge, where the main beam of the cable-stayed bridge is manufactured based on the erection method of the main beam of the cable-stayed bridge as described above.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a method for erecting a main girder of a cable-stayed bridge, the speed of erecting the steel girder can be accelerated, the construction efficiency of bridge erection is improved, according to the characteristic that the main girder of the cable-stayed bridge is a steel-concrete combined beam, the requirement on a bridge deck crane is effectively reduced by using the steel girder in the hoisting and splicing stage of parts, a concrete bridge deck is sequentially hoisted on two segmental steel girders after two segmental steel girders are hoisted firstly, the maintenance time of a wet joint in the embodiment of the application can shorten the construction period of hoisting the circular segmental steel girders, therefore, the erection speed of the main girder of the cable-stayed bridge can be accelerated in the embodiment of the application, the girder erection period is shortened, meanwhile, the requirement on the bridge deck crane is reduced, and the utilization rate of the bridge deck crane.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a main beam of a cable-stayed bridge provided by the embodiment of the application when a segmental steel beam assembly is hoisted;
fig. 2 is a schematic view of a main girder of a cable-stayed bridge provided by the embodiment of the application when the main girder lifts a concrete bridge deck;
fig. 3 is a schematic view illustrating a concrete deck slab of a main beam of a cable-stayed bridge hoisted on a second section of steel beam according to the embodiment of the present application;
FIG. 4 is a top view of the deck crane of FIG. 3 with the deck crane removed;
in the figure: 1. a bridge deck crane; 2. a erected segmented beam; 3. a section steel beam; 4. a stay cable; 5. a concrete deck slab; 6. and (5) wet seaming.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 4, an embodiment of the present application provides an erection method of a main beam of a cable-stayed bridge, where the main beam of the cable-stayed bridge is a steel-concrete composite beam, and the erection method includes the following steps:
step 1: prefabricating a plurality of section steel girder assemblies, wherein each section steel girder assembly comprises two main longitudinal girders, a plurality of cross girders and a plurality of secondary longitudinal girders;
step 2: moving the bridge deck crane 1 on the erected segmental beam 2;
and step 3: sequentially hoisting two sections of steel beam assemblies on a cantilever of the erected section beam 2 by using the bridge deck crane 1 to form two connected sections of steel beams 3, connecting the sections of steel beams 3 with a main tower of a cable-stayed bridge through stay cables 4 after each section of steel beam 3 is formed, and primarily tensioning the stay cables 4;
and 4, step 4: hoisting a plurality of prefabricated concrete bridge deck boards 5 on the two segmental steel beams 3 by using the bridge deck crane 1;
and 5: pouring a plurality of wet joints 6 among the concrete bridge deck plates 5, tensioning all the stay cables 4 on the two segmental steel beams 3 again when the strength of the wet joints 6 at least reaches the preset design strength, and moving the bridge deck crane 1 towards the newly erected segmental beam when the erection of the two segmental beams is finished;
step 6: and repeating the steps 2-5 until all the sections are erected.
The erection method of cable-stay bridge girder that this application embodiment provided can accelerate girder steel erection speed, improve the efficiency of construction that the bridge was erect, according to the characteristics that the cable-stay bridge girder is steel-concrete composite beam, use the effective requirement that reduces the bridge floor hoist of parts hoist concatenation stage girder steel, hoist concrete bridge panel in proper order on two segmental girder steels after hoisting two segmental girder steels earlier, the maintenance time of wet seam can shorten the construction cycle of the single segmental girder steel mode of circulation in this application embodiment, therefore, the erection speed of cable-stay bridge girder can be accelerated in this application embodiment, and shorten the girder erection cycle, and simultaneously, reduce the requirement to the bridge floor hoist, improve the utilization ratio of bridge floor hoist.
In actual construction, the lifting amplitude of the deck crane 1 is substantially the same as the length of the two segment beams.
Specifically, in step 2, the first erected segment is erected on the main tower of the cable-stayed bridge. The erection method includes that main towers of the cable-stayed bridge are symmetrically and sequentially erected from the cable-stayed bridge along the bridge to two ends of the inclined cable-stayed bridge, namely, main beams of the cable-stayed bridge are symmetrically and sequentially erected from the main tower of the cable-stayed bridge to two sides. The synchronous erection shortens the whole bridge construction period of the cable-stayed bridge.
In particular, two of the section girders 3 define a first section girder close to the erected section girder 2 and a second section girder far from the erected section girder 2; the specific steps of the step 4 are as follows:
step 401: hoisting a plurality of prefabricated concrete bridge decks 5 on the first section of steel girder from near to far by using the bridge deck crane 1;
step 402: placing a plurality of the concrete deck slabs 5 to be hoisted on the first section of steel girder;
step 403: and hoisting a plurality of concrete bridge deck boards 5 to be hoisted on the second section of steel girder from near to far in sequence by using the bridge deck crane 1.
Further, the step 401 is performed while the second section of steel girder is erected in the step 3.
In this embodiment, the bridge crane 1 is used to hoist the first section of steel beam and the second section of steel beam in sequence from near to far, the farthest cross beam and the secondary longitudinal beam of the second section of steel beam are temporarily not installed, the cross beam and the secondary longitudinal beam are stored on the erected first section of steel beam, the bridge crane 1 hoists the concrete bridge deck 5 to the steel beam in sequence from near to far for installation, the farthest concrete bridge deck is temporarily hoisted to the installed bridge deck for placement, then the farthest cross beam and the secondary longitudinal beam of the second section of steel beam are hoisted by the bridge crane 1, and finally the concrete bridge deck 5 is installed, so that the positioning times of the steel beam transportation ship are reduced, and the construction efficiency of the embodiment of the present application is effectively improved.
Specifically, the bridge crane 1 is used for hoisting a plurality of concrete bridge decks 5 on the second section of steel girder from near to far in sequence. The concrete bridge deck 5 is hoisted from near to far, so that the use working efficiency of the bridge deck crane 1 can be improved, and the construction period is further shortened.
Specifically, the bridge deck crane 1 is located at the cantilever end when hoisting, the hoisting stroke of the bridge deck crane 1 at the cantilever end can be relatively far, and the utilization rate of the bridge deck crane 1 is improved.
Specifically, the step 3 further includes:
moving the segmental steel girder assembly under a position to be hoisted, and hoisting the segmental steel girder assembly from under the position using the bridge deck crane 1.
In this embodiment, the segment steel girder assemblies are assembled after being moved to appropriate positions in advance, so that the time for the deck crane 1 to transport the segment steel girder assemblies at a long distance can be shortened, and the construction period can be further shortened.
The method for erecting the main beam of the cable-stayed bridge provided by the application is explained in the following by combining a specific embodiment. The erection method comprises the following steps:
step 1: prefabricating a plurality of section steel girder assemblies, wherein each section steel girder assembly comprises two main longitudinal girders, a plurality of cross girders and a plurality of secondary longitudinal girders;
step 2: moving the bridge deck crane 1 on the erected segmental beam 2;
and step 3: hoisting a first section steel beam assembly on a cantilever of the erected section beam 2 by using the bridge deck crane 1 to form a first section steel beam, connecting a main longitudinal beam of the first section steel beam with a main tower of a cable-stayed bridge through a stay cable 4, and tensioning the stay cable 4 for the first time to ensure the bearing capacity of the first section steel beam;
and 4, step 4: the bridge crane 1 is used for hoisting two main longitudinal beams in a second section steel beam assembly, a part of cross beams and secondary longitudinal beams which are close to the first section steel beam on the cantilever end of the first section steel beam, namely the cross beams and the secondary longitudinal beams on the outermost side of the second section steel beam are temporarily not installed firstly, and the construction mode is caused by the limitation of the hoisting range of the bridge crane 1, so that only part of the cross beams and the secondary longitudinal beams are installed for the subsequent hoisting of the concrete bridge deck 5; connecting the two main longitudinal beams in the step with a main tower of a cable-stayed bridge through a plurality of stay cables 4, and tensioning the stay cables 4 for the first time to ensure the bearing capacity of the main longitudinal beams;
and 5: hoisting a plurality of prefabricated concrete bridge decks 5 on the first section of steel girder from near to far by using the bridge deck crane 1;
step 6: placing a plurality of the concrete deck slabs 5 to be hoisted on the first section of steel girder;
and 7: continuously using the bridge deck crane 1 to hoist another part of the cross beams and the secondary longitudinal beams in the second section of steel beam assembly to form a second section of steel beam;
and 8: hoisting a plurality of concrete bridge decks 5 to be hoisted on the second section of steel girder from near to far in sequence by using the bridge deck crane 1;
and step 9: pouring wet joints 6 among a plurality of concrete bridge deck boards 5, and when the strength of the wet joints 6 reaches a preset design strength, tensioning all the stay cables 4 on the two segmental steel beams 3 again to adjust the line shapes of the segmental beams, so that the erection quality of the segmental beams is ensured, and erection of the two segmental beams, namely erection of the corresponding first segmental beam and the corresponding second segmental beam, is completed; the wet joints 6 in the two segmental beams are maintained simultaneously, and the construction period of erection is shortened;
step 10: and moving the bridge deck crane 1 towards the newly erected section beam, wherein the second section beam is the erected section beam, and circularly executing the steps 2-9 until all the section beams are erected.
Compared with the existing assembling and erecting of circulating cantilever parts, the lifting stroke of the bridge deck crane is fully utilized, the lifting of the segmental beams in each circulation comprises the lifting of two segmental beams, the lifting range of the bridge deck crane 1 can be effectively utilized, the segmental steel beam assembly of the parts can reduce the requirement on the lifting capacity of the bridge deck crane 1, and the wet joints in the two segmental beams are maintained simultaneously, so that the construction period is effectively shortened.
The embodiment of the application also provides a main beam of the cable-stayed bridge, which is manufactured based on the erection method of the main beam of the cable-stayed bridge.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The method for erecting the main beam of the cable-stayed bridge is a steel-concrete combined beam and is characterized by comprising the following steps of:
step 1: prefabricating a plurality of section steel girder assemblies, wherein each section steel girder assembly comprises two main longitudinal girders, a plurality of cross girders and a plurality of secondary longitudinal girders;
step 2: moving the bridge deck crane (1) on the erected segmental beam (2);
and step 3: sequentially hoisting two sections of steel beam assemblies on a cantilever of the erected section beam (2) by using the bridge deck crane (1) to form two connected section steel beams (3), connecting the section steel beams (3) with a main tower of the cable-stayed bridge through stay cables (4) after each section of steel beam (3) is formed, and tensioning the stay cables (4) for the first time;
and 4, step 4: hoisting a plurality of prefabricated concrete bridge deck boards (5) on the two segmental steel beams (3) by using the bridge deck crane (1);
and 5: pouring wet joints (6) among a plurality of concrete bridge deck boards (5), tensioning all stay cables (4) on two segmental steel beams (3) again when the strength of the wet joints (6) at least reaches preset design strength, and moving the bridge deck crane (1) towards the direction of the newly erected segmental beam when erection of the two segmental beams is completed;
step 6: and repeating the steps 2-5 until all the sections are erected.
2. Method for erecting a main girder of a cable-stayed bridge according to claim 1, characterized in that the lifting amplitude of the deck crane (1) is substantially the same as the length of the two segmental girders.
3. A method for erecting a main beam of a cable-stayed bridge according to claim 1, wherein in the step 2, a first erected segment is erected on a main tower of the cable-stayed bridge.
4. Method for erecting main beams of cable-stayed bridges according to claim 1, characterized in that two of said segmental steel beams (3) define a first segmental steel beam close to said erected segmental beam (2) and a second segmental steel beam remote from said erected segmental beam (2); the specific steps of the step 4 are as follows:
step 401: hoisting a plurality of prefabricated concrete bridge deck boards (5) on the first section of steel girder from near to far by using the bridge deck crane (1);
step 402: placing a plurality of the concrete deck slabs (5) to be hoisted on the first section of steel girder;
step 403: and hoisting a plurality of concrete bridge deck boards (5) to be hoisted on the second section of steel girder from near to far in sequence by using the bridge deck crane (1).
5. The method for erecting a main beam of a cable-stayed bridge according to claim 4, wherein the step 401 is performed while the second section of steel girder is erected in the step 3.
6. The method for erecting a main girder of a cable-stayed bridge according to claim 5, wherein the bridge deck crane (1) is used to hoist a plurality of concrete deck slabs (5) on the second section of steel girder from near to far in sequence.
7. A method for erecting a main girder of a cable-stayed bridge according to claim 1, wherein the deck cranes (1) are all positioned at the cantilever end during hoisting.
8. A method for erecting a main beam of a cable-stayed bridge according to claim 1, wherein the step 3 further comprises:
moving the segmental steel girder assembly below a position to be hoisted, and hoisting the segmental steel girder assembly from below the position by using the bridge deck crane (1).
9. A method for erecting a main beam of a cable-stayed bridge according to claim 1, wherein the main beam of the cable-stayed bridge is erected in a direction symmetrically and sequentially from a main tower of the cable-stayed bridge to both sides.
10. A main beam for a cable-stayed bridge, characterized in that the main beam for a cable-stayed bridge is manufactured by the method for erecting a main beam for a cable-stayed bridge according to any one of claims 1 to 9.
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| CN202010317545.0A CN111424556A (en) | 2020-04-21 | 2020-04-21 | Method for erecting main beam of cable-stayed bridge and main beam of cable-stayed bridge |
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| CN202010317545.0A CN111424556A (en) | 2020-04-21 | 2020-04-21 | Method for erecting main beam of cable-stayed bridge and main beam of cable-stayed bridge |
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Application publication date: 20200717 |
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