Construction methods for installing steel box girders in steel structure bridges

Abstract

This invention discloses a method for installing steel box girders in steel structure bridges. The method divides the steel box girder to be installed between two adjacent piers into at least two segments along the front-to-back direction. During hoisting, lifting equipment sequentially lifts and installs the steel box girder segments between the two adjacent piers from front to back. The adjacent steel box girder segments are welded together. The lifting equipment is arranged collinearly with the two adjacent piers. Therefore, the lifting equipment can be located on the line connecting the two adjacent piers or on the extended line connecting the two adjacent piers. This allows the lifting equipment to progressively install each steel box girder segment between the two adjacent piers from front to back, thus completing the installation of the steel box girder between the two adjacent piers. This method makes full use of the space between the two adjacent piers, thereby significantly reducing the construction space required for steel box girder installation.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for installing steel box girders in steel structure bridges. Background Technology

[0002] Steel structure bridges refer to bridges whose main load-bearing structure is made of steel. Due to their advantages such as low cost, good structural performance, fast construction speed, and good strength, they have gradually been recognized by people.

[0003] Steel structure bridges generally consist of piers and steel box girders erected on the piers. Currently, there are two common methods for installing steel box girders: one is the jacking method, where the steel box girder is assembled at one end and then jacked up using guide rails and hydraulic equipment until it is in place. This method requires setting up numerous jigs and guide rails and necessitates a large assembly area, which can easily affect the construction of other structures. The other method is the side-mounted hoisting method, which uses conventional lifting equipment to hoist the steel box girder. First, support jigs and assembly jigs are arranged between the bridge sections. Then, the lifting equipment is positioned to the side of the installation location to hoist the steel component onto the jig for temporary fixation. Welding is then performed after hoisting. This method, because the lifting equipment is used on the side, requires a larger construction area and can easily obstruct temporary road access. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a construction method for installing steel box girders in steel structure bridges, which can reduce the construction space required for steel box girder installation.

[0005] According to the steel box girder installation construction method of the steel structure bridge according to the present invention, the steel box girder to be installed between two adjacent piers is divided into at least two steel box girder components along the front-to-back direction; during hoisting, the hoisting equipment lifts the steel box girder components sequentially along the front-to-back direction and installs them between two adjacent piers, and the two adjacent steel box girder components are welded together, wherein the hoisting equipment is arranged collinearly with the two adjacent piers.

[0006] The steel box girder installation method for steel structure bridges according to embodiments of the present invention has at least the following beneficial effects: By employing the steel box girder installation method of this invention, the steel box girder to be installed between two adjacent piers is divided into at least two steel box girder components. The lifting equipment is arranged collinearly with the two adjacent piers, that is, the lifting equipment can be located on the line connecting the two adjacent piers or on the extension line of the line connecting the two adjacent piers. In this way, the lifting equipment can be used to gradually complete the installation of each steel box girder component between the two adjacent piers in a front-to-back direction, thereby completing the installation of the steel box girder between the two adjacent piers. This method can make full use of the space between the two adjacent piers, thereby greatly reducing the construction space required for the installation of the steel box girder.

[0007] According to some embodiments of the present invention, when the lifting equipment lifts and installs the steel box girder component between two adjacent piers, the following steps are included: installing a jig between two adjacent piers, the jig being located in front of the lifting equipment; the lifting equipment lifting the steel box girder component and placing it on the jig, and welding the two adjacent steel box girder components together.

[0008] According to some embodiments of the present invention, the installation of the steel box girder component connected to the bridge pier includes the following steps: the lifting equipment first lifts the cap beam and installs it onto the bridge pier; the lifting equipment then lifts the steel box girder component and installs it on one side of the bridge pier, and the steel box girder component is welded to the cap beam.

[0009] According to some embodiments of the present invention, the number of piers is at least three, and the piers on both the front and rear sides where the steel box girder components need to be installed are intermediate piers. When installing the steel box girder components on the front and rear sides of the intermediate piers, the lifting equipment is moved to the rear side of the intermediate piers; the lifting equipment first lifts the cap beam and installs it onto the intermediate piers; the lifting equipment then lifts a section of the steel box girder component onto the front side of the intermediate piers and welds it to the front end of the cap beam; then the lifting equipment lifts a section of the steel box girder component onto the rear side of the intermediate piers and welds it to the rear end of the cap beam.

[0010] According to some embodiments of the present invention, each segment of the steel box girder includes a central steel member and cantilever steel members located on the left and right sides of the central steel member, and both cantilever steel members are welded to the central steel member.

[0011] According to some embodiments of the present invention, when the lifting equipment lifts the steel box girder component and places it on the jig, the lifting equipment first lifts the middle steel component and places it on the jig, and then the lifting equipment lifts the two cantilever steel components and places them on the left and right sides of the middle steel component. In the front-back direction, two adjacent middle steel components are welded together, and two adjacent cantilever steel components are welded together.

[0012] According to some embodiments of the present invention, the installation of the steel box girder component connected to the bridge pier includes the following steps: the lifting equipment first lifts the cap beam and installs it onto the bridge pier; then the lifting equipment lifts the steel box girder component and installs it between two adjacent bridge piers, and in the front-rear direction, the middle steel component is welded to the cap beam, and both cantilever steel components are welded to the cap beam.

[0013] According to some embodiments of the present invention, when the lifting equipment lifts the steel box girder components sequentially from front to back and installs them between two adjacent piers, the lifting equipment can move from front to back along the line connecting the two adjacent piers.

[0014] According to some embodiments of the present invention, after the lifting equipment lifts and installs the two cantilever steel members on the left and right sides of the middle steel member, the lifting equipment is moved in a front-to-back direction, and the two cantilever steel members are welded to the middle steel member.

[0015] According to some embodiments of the present invention, the lifting equipment is a crawler crane.

[0016] 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. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the steel box girder segments to be installed according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the installation of the cap beam on the first pier according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the installation of the first section of the central steel component according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of the first cantilever steel component according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the installation of the middle steel component of the second section according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the installation of the second cantilever steel component according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the installation of the cap beam on the second pier according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the installation of the middle steel component of the third segment in an embodiment of the present invention; Figure 9 This is a schematic diagram of the installation of the third cantilever steel component according to an embodiment of the present invention.

[0018] Figure label: Piers 100, cap beams 110; Steel box girder 200, steel box girder component 210, central steel component 211, and cantilever steel component 212 to be installed. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] Reference Figures 1 to 9 An embodiment of the present invention proposes a method for installing steel box girders in a steel structure bridge. The steel box girder 200 to be installed between two adjacent piers 100 is divided into at least two steel box girder components 210 along the front-to-back direction. During hoisting, the hoisting equipment (not shown in the figure) lifts the steel box girder components 210 sequentially from front to back and installs them between two adjacent piers 100. The two adjacent steel box girder components 210 are welded together. The hoisting equipment is arranged collinearly with the two adjacent piers 100.

[0024] By employing the steel box girder installation method of this invention, the steel box girder 200 to be installed between two adjacent piers 100 is divided into at least two steel box girder components 210, thereby reducing the difficulty of hoisting the steel box girder. The lifting equipment is arranged collinearly with the two adjacent piers 100; that is, the lifting equipment can be located on the line connecting the two adjacent piers 100, or on the extension of the line connecting the two adjacent piers 100. In other words, the lifting equipment can be located within the span area between the two adjacent piers 100, or within the extension area of ​​the span area between the two adjacent piers 100. Thus, the lifting equipment can be used to gradually install each steel box girder component 210 between the two adjacent piers 100 in a front-to-back direction, allowing the adjacent steel box girder components 210 to be welded together, thereby completing the installation of the steel box girder between the two adjacent piers 100. Therefore, this method can fully utilize the span area between the two adjacent piers 100, thereby greatly reducing the construction space required for steel box girder installation and minimizing the impact on the construction of other structures and the passage of temporary roads.

[0025] Furthermore, for construction environments with small work sites on high slopes, by adopting the steel box girder installation construction method of this invention, the lifting equipment can be located in the span area between two adjacent piers 100, thus reducing the need for backfilling of earthwork in the high slope construction area, avoiding the lifting equipment being in an unsafe environment, and effectively improving construction efficiency and reducing construction costs.

[0026] Understandably, referring to Figures 1 to 9 In some embodiments, there are four piers 100, which are arranged at intervals in the front-to-back direction. The steel box girder 200 to be installed between the first two piers 100 is divided into three segments in the front-to-back direction, the steel box girder 200 to be installed between the middle two piers 100 is divided into five segments in the front-to-back direction, and the steel box girder 200 to be installed between the last two piers 100 is divided into three segments in the front-to-back direction. When hoisting the steel box girder between two adjacent piers 100, the hoisting equipment is arranged collinearly with the two adjacent piers 100, and the hoisting equipment is used to lift the steel box girder components 210 sequentially from front to back and install them between the two adjacent piers 100, so that the two adjacent steel box girder components 210 are welded together, thereby completing the installation of the steel box girder between the two adjacent piers 100. It should be noted that, in addition to dividing the steel box girder 200 to be installed between two adjacent piers 100 into three or five steel box girder components 210 in the front-back direction, the steel box girder 200 to be installed between two adjacent piers 100 can also be divided into two, four, six or more steel box girder components 210 in the front-back direction. The present invention does not make specific limitations on this, as long as the steel box girder 200 to be installed between two adjacent piers 100 is divided into at least two steel box girder components 210 in the front-back direction.

[0027] In some embodiments, when the lifting equipment lifts and installs the steel box girder component 210 between two adjacent piers 100, the following steps are included: installing a jig (not shown in the figure) between two adjacent piers 100, the jig being located in front of the lifting equipment; the lifting equipment lifting the steel box girder component 210 and placing it on the jig, and welding the two adjacent steel box girder components 210 together.

[0028] In the above steps, before hoisting the steel box girder component 210, a jig is first installed in the span area between two adjacent piers 100. The jig provides support for the steel box girder component 210, facilitating its installation. Furthermore, since the lifting equipment lifts and installs the steel box girder component 210 sequentially between adjacent piers 100 from front to back, and the jig is installed in front of the lifting equipment during the hoisting of each section of the steel box girder component 210, the lifting equipment can simultaneously compact the installation area of ​​the jig, improving its stability and ensuring the safety of the steel box girder component 210 during hoisting.

[0029] Reference Figures 2 to 4 as well as Figures 7 to 9 In some embodiments, the installation of the steel box girder component 210 connected to the pier 100 includes the following steps: the lifting equipment first lifts the cap beam 110 and installs it to the pier 100; the lifting equipment then lifts the steel box girder component 210 and installs it on one side of the pier 100, and the steel box girder component 210 is welded to the cap beam 110.

[0030] In the above steps, when installing the steel box girder component 210 connected to the pier 100, the lifting equipment first hoists the cap beam 110 onto the pier 100, and then installs the jig for the steel box girder component 210 on one side of the pier 100. The lifting equipment then lifts the steel box girder component 210 and places it onto the jig and welds it to the cap beam 110.

[0031] Specifically, when installing the foremost steel box girder component 210 among two adjacent piers 100, the cap beam 110 is first lifted and installed onto the foremost pier 100 using a lifting device. Then, a jig is installed on the rear side of the foremost pier 100, and the steel box girder component 210 is lifted onto the jig and welded to the cap beam 110 on the foremost pier 100 using a lifting device. When installing the last steel box girder component 210, the cap beam 110 is first lifted and installed onto the rearmost pier 100 using a lifting device. Then, a jig is installed on the front side of the rearmost pier 100, and the steel box girder component 210 is lifted using a lifting device. The front end of the steel box girder component 210 is welded to the previous steel box girder component 210, and the rear end of the steel box girder component 210 is welded to the cap beam 110 on the rearmost pier 100.

[0032] Understandably, referring to Figures 1 to 9 The steel box girder 200 to be installed between the first two piers 100 is divided into three steel box girder components 210 along the front-rear direction. The hoisting process includes the following steps: The lifting equipment first lifts a cap beam 110 and installs it on the front pier 100; a jig for the first steel box girder component 210 is installed on the rear side of the front pier 100; the first steel box girder component 210 is lifted and placed on the corresponding jig using the lifting equipment and welded to the cap beam 110 on the front pier 100; a jig for the second steel box girder component 210 is installed on the rear side of the first steel box girder component 210; the second steel box girder component 210 is then lifted and placed on the corresponding jig using the lifting equipment. The box girder component 210 is lifted and placed on the corresponding jig and welded to the first steel box girder component 210; a cap beam 110 is lifted and installed on the rear pier 100 using a lifting device; a jig for the third steel box girder component 210 is installed between the second steel box girder component 210 and the rear pier 100; the third steel box girder component 210 is lifted and placed on the corresponding jig using a lifting device, and the front end of the third steel box girder component 210 is welded to the second steel box girder component 210, and the rear end of the third steel box girder component 210 is welded to the cap beam 110 on the rear pier 100.

[0033] In some embodiments, the number of piers 100 is at least three. The pier 100 that needs to be equipped with steel box girder members 210 on both the front and rear sides is the intermediate pier. When installing the steel box girder members on the front and rear sides of the intermediate pier, the lifting equipment is moved to the rear side of the intermediate pier. The lifting equipment first lifts the cap beam 110 and installs it on the intermediate pier. The lifting equipment then lifts a section of steel box girder member 210 on the front side of the intermediate pier and welds it to the front end of the cap beam 110. Then the lifting equipment lifts a section of steel box girder member 210 on the rear side of the intermediate pier and welds it to the rear end of the cap beam 110.

[0034] In the above steps, when there are at least three piers 100, there is at least one intermediate pier that requires the installation of steel box girder members 210 on both its front and rear sides. During installation, the lifting equipment is moved to the rear side of the pier 100. First, the cap beam 110 is hoisted to the intermediate pier using the lifting equipment. Then, the steel box girder member 210 located on the front side of the intermediate pier is hoisted using the lifting equipment. Next, the steel box girder member 210 located on the rear side of the intermediate pier is hoisted. This completes the installation of the steel box girder on the front side of the intermediate pier and begins the installation of the steel box girder on the rear side of the intermediate pier, ensuring that the lifting equipment can sequentially complete the hoisting of each steel box girder member 210 in a front-to-back direction.

[0035] Understandably, referring to Figures 1 to 9There are four piers 100. Steel box girder components 210 need to be installed on both the front and rear sides of the second and third piers 100; that is, the second and third piers 100 are both intermediate piers. Therefore, for the second pier 100, the lifting equipment is moved between the second and third piers 100. First, the cap beam 110 is hoisted onto the second pier 100. Then, the last section of the steel box girder component 210 between the first and second piers 100 is hoisted. Afterward, the first section of the steel box girder component 210 between the second and third piers 100 is hoisted. This completes the installation of the steel box girder between the first and second piers 100, and the installation of the steel box girder between the second and third piers 100 begins. Similarly, the same construction steps were taken for the third pier 100 to ensure that the lifting equipment could complete the hoisting of each steel box girder component 210 in a sequential manner from front to back.

[0036] Reference Figures 2 to 9 In some embodiments, each steel box girder member 210 includes a central steel member 211 and cantilever steel members 212 located on the left and right sides of the central steel member 211, and both cantilever steel members 212 are welded to the central steel member 211.

[0037] In the above structure, each steel box girder component 210 is divided into a central steel component 211 and two cantilever steel components 212 in the left-right direction, which facilitates the hoisting of the steel box girder component 210 by lifting equipment. Furthermore, during the fabrication of the steel box girder component 210, the central steel component 211 and the cantilever steel components 212 can be fabricated separately according to the stress conditions of the steel box girder component 210 during use, thereby ensuring the stress balance and structural stability of the steel box girder component 210 during use.

[0038] Reference Figures 2 to 9 In some embodiments, when the lifting equipment lifts the steel box girder component 210 and places it on the jig, the lifting equipment first lifts the middle steel component 211 and places it on the jig, and then lifts the two cantilever steel components 212 and places them on the left and right sides of the middle steel component 211. In the front-back direction, the two adjacent middle steel components 211 are welded together, and the two adjacent cantilever steel components 212 are welded together.

[0039] In the above steps, the central steel component 211 is hoisted first, and then the cantilever steel components 212 on both sides of the central steel component 211 are hoisted, that is, the steel box girder component 210 is hoisted in sections, which makes the hoisting of the steel box girder component 210 more convenient.

[0040] It is understood that in the above steps, the central steel component 211 can be welded to the previous central steel component 211 first, and then the cantilever steel components 212 on both sides can be lifted and placed on the jig. Alternatively, the central steel component 211 can be welded to the previous central steel component 211 while the cantilever steel components 212 on both sides are being lifted and placed on the jig. Similarly, the two cantilever steel components 212 can be welded to the two cantilever steel components 212 on the front side first, and then the central steel component 211 of the next section of the steel box girder component 210 can be lifted and placed on the jig. Alternatively, the two cantilever steel components 212 can be welded to the central steel component 211 while the central steel component 211 of the next section of the steel box girder component 210 is being lifted and placed on the jig. The present invention does not specifically limit this.

[0041] Reference Figures 2 to 9 In some embodiments, the installation of the steel box girder component 210 connected to the pier 100 includes the following steps: the lifting equipment first lifts the cap beam 110 and installs it onto the pier 100; then the lifting equipment lifts the steel box girder component 210 and installs it between two adjacent piers 100. In the front-rear direction, the middle steel component 211 is welded to the cap beam 110, and both cantilever steel components 212 are welded to the cap beam 110.

[0042] In the above steps, when installing the steel box girder component 210 connected to the pier 100, the cap beam 110 is first lifted and installed on the pier 100 by a lifting device. Then, the jig for the steel box girder component 210 is installed. The middle steel box girder is lifted onto the jig by a lifting device and welded to the cap beam 110. Finally, the two cantilever steel box girders are lifted to the left and right sides of the middle steel component 211 by a lifting device and welded to the cap beam 110.

[0043] Specifically, when installing the foremost steel box girder component 210 in two adjacent piers 100, the cap beam 110 is first lifted by a crane and installed on the foremost pier 100. Then, a jig for the steel box girder component 210 is installed on the rear side of the foremost pier 100. The middle steel box girder is lifted by a crane onto the jig and welded to the cap beam 110 on the foremost pier 100. Then, the cantilever steel box girders on both sides of the middle steel box girder are lifted onto the jig and welded to the cap beam 110 on the foremost pier 100. When installing the last steel box girder component 210, the cap beam 110 is first lifted and installed onto the rear pier 100 using a lifting device. Then, a jig for the steel box girder component 210 is installed on the front side of the rear pier 100. The middle steel box girder is lifted onto the jig using a lifting device, and the front end of the middle steel box girder is welded to the previous middle steel box girder. The rear end is welded to the cap beam 110 on the rear pier 100. Then, the cantilever steel box girders on both sides of the middle steel box girder are lifted onto the jig using a lifting device. The front ends of the two cantilever steel box girders are welded to the two cantilever steel box girders on the front side one by one, and the rear ends are welded to the cap beam 110 on the rear pier 100.

[0044] In some embodiments, when the lifting equipment lifts the steel box girder component 210 sequentially from front to back and installs it between two adjacent piers 100, the lifting equipment can move from front to back along the line connecting the two adjacent piers 100.

[0045] In the above steps, by moving the lifting equipment from front to back along the line connecting two adjacent piers 100, the lifting equipment can better compact the installation site of the jig during movement, improve the stability of the jig, and ensure the safety of the steel box girder component 210 during hoisting.

[0046] In some embodiments, after the lifting equipment lifts the two cantilever steel members 212 and installs them on the left and right sides of the middle steel member 211, the lifting equipment is moved in a front-to-back direction, and the two cantilever steel members 212 are welded to the middle steel member 211.

[0047] In the above steps, while moving the lifting equipment from front to back, the two cantilever steel components 212 are welded to the central steel component 211. This greatly saves construction time and effectively improves construction efficiency. In addition, the movement of the lifting equipment can compact the installation site of the jig, improve the stability of the jig, and ensure the safety of the steel box girder component 210 during hoisting.

[0048] Understandably, while moving the lifting equipment from front to back, the jig for the next steel box girder component 210 can also be installed, further saving construction time and improving construction efficiency.

[0049] In some embodiments, the lifting equipment is a crawler crane.

[0050] In the above structure, by using a crawler crane, the lifting equipment can better compact the installation site of the jig, improve the stability of the jig, and ensure the safety of the steel box girder component 210 during the hoisting process.

[0051] Below is a specific embodiment.

[0052] Reference Figures 1 to 2 There are four piers 100, spaced apart in the front-to-back direction. The steel box girder 200 to be installed between the first two piers 100 is divided into three sections in the front-to-back direction; the steel box girder 200 to be installed between the middle two piers 100 is divided into five sections in the front-to-back direction; and the steel box girder 200 to be installed between the last two piers 100 is divided into three sections in the front-to-back direction. The hoisting process includes the following steps: Place the lifting equipment between the first two piers 100, and use the lifting equipment to lift the cap beam 110 and install it onto the first pier 100; A jig for the first steel box girder component 210 is installed between the first pier 100 and the lifting equipment. The middle steel component 211 of the first steel box girder component 210 is lifted by the lifting equipment and placed on the corresponding jig. The two cantilever steel components 212 of the first steel box girder component 210 are lifted and placed on the left and right sides of the middle steel component 211. The middle steel component 211 and the two cantilever steel components 212 of the first steel box girder component 210 are welded to the cap beam 110 on the first pier 100. The lifting equipment moves backward, and at the same time, the two cantilever steel components 212 in the first section of the steel box girder component 210 are welded to the middle steel component 211. A jig for the second steel box girder component 210 is installed between the first steel box girder component 210 and the lifting equipment. The middle steel component 211 of the second steel box girder component 210 is lifted by the lifting equipment and placed on the corresponding jig. The two cantilever steel components 212 of the second steel box girder component 210 are lifted and placed on the left and right sides of the middle steel component 211. The middle steel component 211 of the second steel box girder component 210 is welded to the middle steel component 211 of the first steel box girder component 210. The two cantilever steel components 212 of the second steel box girder component 210 are welded to the two cantilever steel components 212 of the first steel box girder component 210 one by one. The lifting equipment was moved to the rear of the second pier 100, and at the same time, the two cantilever steel members 212 in the second steel box girder member 210 were welded to the middle steel member 211. The lifting equipment lifted the cap beam 110 and installed it onto the second pier 100; A jig for the third steel box girder component 210 is installed between the second steel box girder component 210 and the second pier 100. The middle steel component 211 of the third steel box girder component 210 is lifted by a lifting device and placed on the corresponding jig. The two cantilever steel components 212 of the third steel box girder component 210 are lifted and placed on the left and right sides of the middle steel component 211. The front end of the middle steel component 211 of the third steel box girder component 210 is welded to the middle steel component 211 of the second steel box girder component 210, and the rear end is welded to the cap beam 110 on the second pier 100. The front ends of the two cantilever steel components 212 of the third steel box girder component 210 are welded to the two cantilever steel components 212 of the second steel box girder component 210 one by one, and the rear ends are welded to the cap beam 110 on the second pier 100. This completes the installation of the steel box girder between the first two piers 100. Then, a jig for the first section of steel box girder component 210 between the middle two piers 100 is installed between the lifting equipment and the second pier 100. The middle steel component 211 of the first section of steel box girder component 210 is lifted by the lifting equipment and placed on the corresponding jig. The two cantilever steel components 212 of the first section of steel box girder component 210 are lifted and placed on the left and right sides of the middle steel component 211. The middle steel component 211 and the two cantilever steel components 212 of the first section of steel box girder component 210 are welded to the cap beam 110 on the second pier 100. Then, the lifting equipment hoisted the second steel box girder component 210, the third steel box girder component 210, and the fourth steel box girder component 210 in a front-to-back direction to the space between the second pier 100 and the third pier 100. At this time, the lifting equipment was located behind the third pier 100. The cap beam 110 is lifted and installed onto the third pier 100 using a lifting device. Then, the fifth steel box girder component 210 between the second pier 100 and the third pier 100 is lifted using a lifting device, thereby completing the installation of the steel box girder between the second pier 100 and the third pier 100. Finally, the lifting equipment hoisted the first steel box girder component 210, the second steel box girder component 210, and the third steel box girder component 210 sequentially from front to back to the last two piers 100, thus completing the installation of the steel box girder between the third pier 100 and the fourth pier 100.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for installing steel box girders in steel structure bridges, characterized in that, The steel box girder (200) to be installed between two adjacent piers (100) is divided into at least two steel box girder components (210) in the front-back direction. During hoisting, the lifting equipment lifts the steel box girder components (210) sequentially from front to back and installs them between two adjacent piers (100). The two adjacent steel box girder components (210) are welded together. The lifting equipment is arranged in the same line as the two adjacent piers (100). When the lifting equipment lifts the steel box girder component (210) and installs it between two adjacent piers (100), the following steps are included: A jig is installed between two adjacent piers (100). The jig is located in front of the lifting equipment, so that the lifting equipment can compact the installation site of the jig while hoisting the steel box girder component (210), thereby improving the stability of the jig and ensuring the safety of the steel box girder component (210) during the hoisting process. The lifting equipment lifts the steel box girder component (210) and places it on the jig, and welds two adjacent steel box girder components (210) together; When installing the steel box girder member (210) connected to the pier (100), the following steps are included: The lifting equipment first lifts the cap beam (110) and installs it onto the pier (100). The lifting equipment then lifts the steel box girder component (210) and installs it on one side of the pier (100), and the steel box girder component (210) is welded to the cap beam (110); In the case of two adjacent piers (100), when installing the foremost steel box girder member (210), the cap beam (110) is first lifted by a crane and installed onto the foremost pier (100). Then, a jig is installed on the rear side of the foremost pier (100), and the steel box girder member (210) is lifted onto the jig by a crane and welded to the cap beam (110) on the foremost pier (100). When installing the last steel box girder member (210) When the bridge is in operation, the cap beam (110) is first lifted by the lifting equipment and installed on the pier (100) at the rear end. Then, a jig is installed on the front side of the pier (100) at the rear end. The steel box girder component (210) is lifted by the lifting equipment, and the front end of the steel box girder component (210) is welded to the previous steel box girder component (210). The rear end of the steel box girder component (210) is welded to the cap beam (110) on the pier (100) at the rear end. The number of piers (100) is at least three. The piers (100) on both the front and rear sides are the middle piers. When installing the steel box girder components (210) on the front and rear sides of the middle piers, Move the lifting equipment to the rear side of the intermediate pier; The lifting equipment first lifts the cap beam (110) and installs it onto the intermediate pier; The lifting equipment then hoists a section of the steel box girder component (210) to the front side of the intermediate pier and welds it to the front end of the cap beam (110); The lifting equipment then hoists a section of the steel box girder component (210) to the rear side of the intermediate pier and welds it to the rear end of the cap beam (110).

2. The method for installing steel box girders in steel structure bridges according to claim 1, characterized in that, Each of the steel box girder components (210) includes a central steel component (211) and cantilever steel components (212) located on the left and right sides of the central steel component (211). Both cantilever steel components (212) are welded to the central steel component (211).

3. The method for installing steel box girders in steel structure bridges according to claim 2, characterized in that, When the lifting equipment lifts the steel box girder component (210) and places it on the jig, The lifting equipment first lifts the central steel component (211) and places it on the jig. Then the lifting equipment lifts the two cantilever steel components (212) and places them on the left and right sides of the central steel component (211). In the front-back direction, the two adjacent central steel components (211) are welded together, and the two adjacent cantilever steel components (212) are welded together.

4. The method for installing steel box girders in steel structure bridges according to claim 3, characterized in that, When installing the steel box girder member (210) connected to the pier (100), the operation is replaced by the following steps: The lifting equipment first lifts the cap beam (110) and installs it onto the pier (100). Then the lifting equipment lifts the steel box girder component (210) and installs it between two adjacent piers (100). In the front-rear direction, the middle steel component (211) is welded to the cap beam (110), and the two cantilever steel components (212) are welded to the cap beam (110).

5. The method for installing steel box girders in steel structure bridges according to claim 3 or 4, characterized in that, When the lifting equipment lifts the steel box girder component (210) sequentially from front to back and installs it between two adjacent piers (100), the lifting equipment can move from front to back along the line connecting the two adjacent piers (100).

6. The method for installing steel box girders in steel structure bridges according to claim 5, characterized in that, After the lifting equipment lifts the two cantilever steel components (212) and installs them on the left and right sides of the middle steel component (211), the lifting equipment moves from front to back and welds the two cantilever steel components (212) to the middle steel component (211).

7. The method for installing steel box girders in steel structure bridges according to claim 6, characterized in that, The lifting equipment is a crawler crane.

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