CN112095482A - Steel box girder bridge-spanning existing bridge hoisting construction method - Google Patents
Steel box girder bridge-spanning existing bridge hoisting construction method Download PDFInfo
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- CN112095482A CN112095482A CN202011013753.8A CN202011013753A CN112095482A CN 112095482 A CN112095482 A CN 112095482A CN 202011013753 A CN202011013753 A CN 202011013753A CN 112095482 A CN112095482 A CN 112095482A
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- steel box
- box girder
- crane
- existing bridge
- hoisting
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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
Abstract
The invention discloses a hoisting construction method for a steel box girder across an existing bridge, and solves the technical problem that the hoisting construction efficiency is low and the overall construction progress is influenced in the prior art. The temporary conversion support is hung on one end of the steel box girder, and the other end of the steel box girder is supported by the other crane. The steel box girder erection device is simple in structure, scientific and reasonable in design and convenient to use, can effectively improve the erection construction efficiency of the steel box girder across the existing bridge, thereby ensuring the overall construction progress, and meanwhile, the erection construction can be safe and stable without affecting the safety of the existing bridge.
Description
Technical Field
The invention belongs to the technical field of steel structure construction, and particularly relates to a hoisting construction method for a steel box girder across an existing bridge.
Background
Along with city development, the steel box girder hoist and mount construction of striding existing bridge is the technique commonly used in the construction of municipal steel structure bridge engineering project, and traditional mode hoist and mount efficiency of construction is low, influences whole construction progress. Especially under the limited operating mode of site environment, not only seriously influence whole construction progress, still can produce the influence to existing bridge safety.
Therefore, the steel box girder striding existing bridge hoisting construction method is designed to improve the steel box girder striding existing bridge hoisting construction efficiency, so that the whole construction progress is ensured, and meanwhile, the hoisting construction can also be safe and stable without influencing the safety of the existing bridge, so that the technical problem to be solved urgently by technical personnel in the technical field is solved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the hoisting construction method for the steel box girder across the existing bridge is provided, and the technical problem that the hoisting construction efficiency is low and the overall construction progress is influenced in the prior art is solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a steel box girder striding existing bridge hoisting construction method comprises the following steps:
and 7, cooperatively hoisting the steel box girder to the installation position across the existing bridge by the No. 1 crane and the No. 2 crane.
Further, in the step 1, when the temporary conversion support is erected, a steel box girder on-site assembling platform for assembling the steel box girder is erected synchronously.
Further, the steel box girder on-site assembling platform and the temporary conversion support are positioned on the same side of the existing bridge.
Further, in the step 2, before the steel box girder is hoisted by the crane No. 1, the beam sections on the two sides of the existing bridge for installing the steel box girder are installed first.
Further, in the step 2, when the steel box girder is hoisted to the upper part of the existing bridge by using a crane No. 1, the position of the steel box girder is adjusted to be vertically distributed with the existing bridge.
Further, in the step 4, when the temporary conversion support and the steel box girder are fixed, welding is adopted for fixing.
Further, in the step 6, the connection between the steel box girder and the temporary conversion bracket is released by cutting.
Further, in the step 5, in the hooking releasing process of the crane 1, the stress state of the crane 2 is monitored in real time until the stress system of the steel box girder is completely converted to the temporary conversion support and the crane 2, so that the crane 1 can be completely released.
Compared with the prior art, the invention has the following beneficial effects:
the steel box girder erection device is simple in structure, scientific and reasonable in design and convenient to use, can effectively improve the erection construction efficiency of the steel box girder across the existing bridge, thereby ensuring the overall construction progress, and meanwhile, the erection construction can be safe and stable without affecting the safety of the existing bridge.
The method comprises the steps of firstly arranging a crane on each of two sides of an existing bridge, building a temporary conversion support and a steel box girder field assembly platform on one side of the existing bridge, assembling the steel box girder on the site by the steel box girder field assembly platform before hoisting, and simultaneously completing the installation of girder sections for installing the steel box girders on two sides of the existing bridge to ensure the readiness of the installation working condition of the steel box girders. When hoisting, firstly, hoisting the steel box girder by adopting a crane positioned at the same side of the steel box girder, and adjusting the position of the steel box girder to ensure that the steel box girder is vertical to the existing bridge; and then, the steel box girder descends to enable one end of the steel box girder to be placed on the temporary conversion support, the other end of the steel box girder is hung by using the other crane hook, after the steel box girder and the temporary conversion support are welded and fixed, the previous crane is unhooked, the unhooked crane hook is hung at one end of the steel box girder welded with the temporary conversion support, the steel box girder and the temporary conversion support are cut to remove connection of the steel box girder and the temporary conversion support, at the moment, the two cranes are respectively hung at the two ends of the steel box girder, and then the steel box girder is hung to a bridge installation position by means of cooperation of the two cranes. The whole process is smooth and efficient, safe and stable, and meanwhile, the safety of the existing bridge cannot be affected.
Drawings
FIG. 1 is a schematic view of the No. 1 crane of the invention for lifting a steel box girder.
Fig. 2 is an enlarged view of the crane No. 1 in fig. 1.
Fig. 3 is a vertical view of the steel box girder and the existing bridge by adjusting the crane No. 1 according to the invention.
Fig. 4 is an enlarged view of the crane of fig. 31.
Fig. 5 shows that two ends of the steel box girder are respectively supported on the temporary conversion support and the crane No. 2.
Fig. 6 is an enlarged view of the steel box girder of fig. 5 supported by the temporary transfer support and the crane No. 2, respectively.
FIG. 7 is a schematic diagram of the hoisting of a steel box girder by the matching of the No. 1 crane and the No. 2 crane.
Fig. 8 is a partially enlarged view of the crane No. 1, the crane No. 2 and the steel box girder in fig. 7.
Fig. 9 is a view of the steel box girder of the present invention being hoisted to the installation station by the hoist No. 1 and the hoist No. 2.
Fig. 10 is a partial enlarged view of the crane No. 1, the crane No. 2 and the steel box girder of fig. 9 according to the present invention.
Wherein, the names corresponding to the reference numbers are:
1-existing bridge, 2-1 crane, 3-2 crane, 4-steel box girder, 5-temporary conversion support, 6-girder segment and 7-steel box girder on-site assembly platform.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and thus, it should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; of course, mechanical connection and electrical connection are also possible; alternatively, they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1-10, the construction method for hoisting the existing bridge spanned by the steel box girder provided by the invention has the advantages of simple structure, scientific and reasonable design and convenient use, can effectively improve the construction efficiency for hoisting the existing bridge spanned by the steel box girder, thereby ensuring the whole construction progress, and simultaneously, the hoisting construction can be safe and stable without affecting the safety of the existing bridge. The invention comprises the following steps:
and 7, cooperatively hoisting the steel box girder to the installation position across the existing bridge by the No. 1 crane and the No. 2 crane.
Preferably, in the step 1, when the temporary conversion support is erected, a steel box girder on-site assembling table for assembling the steel box girder is erected synchronously. The steel box girder on-site assembling platform and the temporary conversion support are positioned on the same side of the existing bridge.
Preferably, in the step 2, before the steel box girder is hoisted by the crane No. 1, the beam sections on the two sides of the existing bridge for installing the steel box girder are installed first.
Preferably, in the step 2, when the steel box girder is hoisted to the upper part of the existing bridge by using a crane No. 1, the position of the steel box girder is adjusted to be vertically distributed with the existing bridge.
Preferably, in the step 4, when the temporary conversion support and the steel box girder are fixed, welding is adopted for fixing.
Preferably, in the step 6, the connection between the steel box girder and the temporary conversion bracket is released by cutting.
Preferably, in the step 5, in the hooking releasing process of the crane 1, the stress state of the crane 2 is monitored in real time until the stress system of the steel box girder is completely converted into the temporary conversion support and the crane 2, so that the crane 1 can be completely released.
The method comprises the steps of firstly arranging a crane on each of two sides of an existing bridge, building a temporary conversion support 5 and a steel box girder field assembly platform 7 on one side of the existing bridge 1, wherein the steel box girder field assembly platform and the temporary conversion support are positioned on the same side of the existing bridge, assembling the steel box girder 4 on the site in the steel box girder field assembly platform before hoisting, and simultaneously finishing the installation of beam sections 6 for installing the steel box girders on two sides of the existing bridge to ensure the readiness of the installation working condition of the steel box girders. When hoisting, firstly, hoisting the steel box girder by using a crane 2 No. 1 positioned at the same side of the steel box girder, and adjusting the position of the steel box girder to ensure that the steel box girder is vertical to the existing bridge in the process; and then, the steel box girder descends to enable one end of the steel box girder to be placed on the temporary conversion support, the other end of the steel box girder is hung and hung by a crane No. 2 and a crane No. 3, after the steel box girder and the temporary conversion support are stabilized, the steel box girder and the temporary conversion support are welded and fixed, the crane No. 1 and the crane No. 2 are loosened, the crane No. 1 is hung and hung on one end of the steel box girder welded with the temporary conversion support, the steel box girder and the temporary conversion support are cut to remove the connection of the steel box girder and the temporary conversion support, at the moment, the two cranes are respectively hung at the two ends of the steel box girder, and then the steel box girder is hung to a bridge-crossing installation position. The whole process is smooth and efficient, safe and stable, and meanwhile, the safety of the existing bridge cannot be affected.
In the construction process, an assembling field is arranged on the side of the crane No. 1, a span beam section (the span beam section is a steel box beam, the same applies below) is assembled, the beam sections on two sides of the existing bridge are completely installed before hoisting, and a temporary conversion support is erected. Then, the No. 1 crane lifts the assembled span beam section. And then, rotating the crane No. 1 to enable the span line beam section to be perpendicular to the existing bridge, and reducing the height of the span line beam section to enable one end of the span line beam section to fall on the temporary conversion support. And then the other end of the span line beam section is connected by a No. 2 crane on the other side of the existing bridge. And (4) temporarily fixing the span beam section and the temporary conversion support, preferably welding and fixing. And then slowly releasing the hook of the crane No. 1, and monitoring the stress state of the crane No. 2 until the conversion of a stress system is completed. Then the No. 1 crane changes the hook to the cross-line beam section conversion bracket end, slowly lifts the hook, cuts off the conversion bracket, completes the conversion of the stress system, and forms the double-crane lifting state. And finally, synchronously rotating the No. 1 crane and the No. 2 crane to the in-place position of the span beam section in a coordinated manner to finish hoisting.
The method is different from a common method for hoisting the steel box girder across the existing bridge, has strong pertinence, and solves the problems of limited field, large crane selection and poor economy in the process of hoisting the steel box girder across the existing bridge. Meanwhile, the method has the advantages of low operation difficulty, low cost, low requirement on environment during use, high hoisting speed, small influence on the traffic of the existing bridge and good use effect. The invention has good applicability and strong practicability, and is suitable for popularization and application in hoisting construction of a plurality of existing bridge-spanning steel box girders.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and certainly not to limit the patent scope of the present invention; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems to be solved by the present invention, which are not substantially changed or supplemented by the spirit and the concept of the main body of the present invention, are still consistent with the present invention and shall be included in the scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the patent protection scope of the invention.
Claims (8)
1. A steel box girder striding existing bridge hoisting construction method is characterized by comprising the following steps:
step 1, setting up a temporary conversion support on one side of an existing bridge, and simultaneously setting a crane No. 1 and a crane No. 2 on two sides of the existing bridge respectively, wherein the steel box girder, the temporary conversion support and the crane No. 1 are positioned on the same side of the existing bridge;
step 2, hoisting the steel box girder by using a No. 1 crane and enabling the steel box girder to be positioned above the existing bridge;
step 3, adjusting the height of the steel box girder to enable one end of the steel box girder to be supported on the temporary conversion support, and hooking the other end of the steel box girder by a No. 2 crane;
step 4, fixing the temporary conversion support and the steel box girder;
step 5, loosening the hook of the crane No. 1, and completely supporting the steel box girder by the temporary conversion bracket and the crane No. 2;
step 6, hooking one end of the steel box girder, which is fixed with the temporary conversion support, by the crane No. 1, and removing the connection between the steel box girder and the temporary conversion support;
and 7, cooperatively hoisting the steel box girder to the installation position across the existing bridge by the No. 1 crane and the No. 2 crane.
2. The construction method for hoisting the steel box girder across the existing bridge according to claim 1, wherein in the step 1, a steel box girder on-site assembling table for assembling the steel box girder is synchronously erected when the temporary conversion support is erected.
3. The construction method for hoisting the steel box girder across the existing bridge according to claim 2, wherein the steel box girder field assembling platform and the temporary conversion support are positioned on the same side of the existing bridge.
4. The construction method for hoisting the steel box girder across the existing bridge according to claim 1, wherein in the step 2, beam sections used for installing the steel box girder on two sides of the existing bridge are installed before the steel box girder is hoisted by a crane No. 1.
5. The construction method for hoisting the steel box girder across the existing bridge according to claim 1, wherein in the step 2, when the steel box girder is hoisted to the position above the existing bridge by using a crane No. 1, the position of the steel box girder is adjusted to be vertically distributed with the existing bridge.
6. The construction method for hoisting the steel box girder across the existing bridge according to claim 1, wherein in the step 4, the temporary conversion support and the steel box girder are fixed by welding.
7. The construction method for hoisting the steel box girder across the existing bridge according to claim 6, wherein in the step 6, the connection between the steel box girder and the temporary conversion bracket is released by cutting.
8. The construction method for hoisting the steel box girder across the existing bridge according to claim 1, wherein in the step 5, the stress state of the crane 2 is monitored in real time in the process of releasing the hook of the crane No. 1 until the stress system of the steel box girder is completely converted into the temporary conversion bracket and the crane No. 2, so that the crane No. 1 can be completely released.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011013753.8A CN112095482A (en) | 2020-09-24 | 2020-09-24 | Steel box girder bridge-spanning existing bridge hoisting construction method |
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| CN202011013753.8A CN112095482A (en) | 2020-09-24 | 2020-09-24 | Steel box girder bridge-spanning existing bridge hoisting construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113322823A (en) * | 2021-06-03 | 2021-08-31 | 陕西重型机械制造有限公司 | Rapid hoisting method for large-span steel bridge |
| CN114687293A (en) * | 2022-04-13 | 2022-07-01 | 上海市机械施工集团有限公司 | Steel box girder hoisting method |
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| CN101324146A (en) * | 2008-08-11 | 2008-12-17 | 河北建工集团有限责任公司 | Construction method for hanging wide span arcuated open-web beam |
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Application publication date: 20201218 |
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