A box girder and a manufacturing method thereof

Abstract

The present invention provides a box girder, comprising: a middle section, at least two variable sections and two beam end sections; the middle section is located in the middle of the box girder, and at least one variable section is provided at each of the two ends of the middle section; the two beam end sections are respectively provided at the two ends of the box girder and are connected to the variable sections; the middle section, the variable sections and the beam end sections all include a box body with a receiving cavity in the middle, and the top of the box body extends to both sides perpendicular to the extending direction of the box girder to form two side wings; wherein, the outer contour of the cross-section of the middle section, the variable sections and the beam end sections is the same, and the thickness of the four walls of the box body of the box girder from the middle section in the middle to the beam end sections at both ends increases in sequence, and the volume of the corresponding receiving cavity decreases in sequence. Applying the present invention can eliminate the need to improve the equipment for automatic processing and steel bar binding, and reduce the technical difficulty of the equipment for automatic processing and steel bar binding.

Description

Technical Field

[0001] This application relates to the technical field of bridge engineering, and particularly to a box girder suitable for automatic processing and steel bar binding and a manufacturing method thereof. Background Art

[0002] Precast concrete box girders are widely used in railway, highway and municipal bridges. In the prior art, the structural forms of precast concrete box girders are diverse, but the cross-sectional forms near the beam ends are usually complex. For example, the beam ends of some precast concrete box girders are of a tapered structure with irregular shapes, resulting in difficulties in automatic processing and steel bar binding, and relatively low processing and binding accuracy. In this regard, the traditional idea is to solve this problem by improving the equipment for automatic processing and steel bar binding. However, when binding the steel bars at the complex parts of the beam ends, manual intervention is still inevitably required; moreover, the economic cost of improving the equipment for automatic processing and steel bar binding is relatively high, and it will also make the equipment for automatic processing and steel bar binding become complex, and the maintenance and repair costs will also be relatively high.

[0003] In summary, due to the above problems in the steel bar binding of precast concrete box girders in the prior art, how to propose a box girder and a manufacturing method thereof, so as to avoid improving the equipment for automatic processing and steel bar binding and reduce the technical difficulty of the equipment for automatic processing and steel bar binding, is an urgent problem to be solved in this field. Summary of the Invention

[0004] In view of this, the present invention provides a box girder and a manufacturing method thereof, so that it is no longer necessary to improve the equipment for automatic processing and steel bar binding, and the technical difficulty of the equipment for automatic processing and steel bar binding is reduced.

[0005] The technical solution of the present invention is specifically realized as follows:

[0006] A box girder includes: a middle section, at least two variable sections and two beam end sections;

[0007] The middle section is located in the middle of the box girder, and at least one variable section is provided at each end of the middle section; the two beam end sections are respectively provided at the two ends of the box girder and are connected to the variable sections;

[0008] The middle section, the variable section and the beam end section all include a box body with a receiving cavity in the middle. The top of the box body extends to both sides perpendicular to the extending direction of the box girder, forming two side wings;

[0009] Wherein, the outer contours of the cross-sections of the middle section, the variable section and the beam end section are the same, and the thicknesses of the four walls of the box body of the box girder from the middle section in the middle to the beam end sections at both ends increase in sequence, and the volumes of the corresponding receiving cavities decrease in sequence;

[0010] Longitudinal steel bars are respectively arranged along the extension direction of the box girder within the four walls and the side wings of the boxes of the middle section, the variable section, and the beam end section, and binding steel bars for binding the longitudinal steel bars are respectively arranged at intervals in the direction perpendicular to the longitudinal steel bars.

[0011] Preferably, the longitudinal steel bars include: outer layer steel bars and inner layer steel bars;

[0012] The outer layer steel bars are arranged along the outer contour of the box girder, within the outer edges of the four walls and the side wings of the box, and run through the entire box girder;

[0013] The inner layer steel bars are arranged along the contour of the accommodation cavities of the middle section, the variable section, and the beam end section respectively, within the inner edges of the four walls of the boxes of the middle section, the variable section, and the beam end section.

[0014] Preferably, the binding steel bars of the middle section include: outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, and bottom corner steel bars; among which,

[0015] The outer top steel bars, side wing steel bars, and peripheral steel bars are interconnected and arranged outside the outer layer steel bars of the box girder;

[0016] One end of the side wing steel bar is bent upward to form a bent portion, which is located inside the inner layer steel bars at the top corners of the box;

[0017] The inner top steel bars, the bent portions of the side wing steel bars, the side steel bars, the inner bottom steel bars, and the bottom corner steel bars are interconnected and are respectively arranged inside the inner layer steel bars of the box.

[0018] Preferably, the binding steel bars of the variable section and the beam end section respectively include: outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, top corner steel bars, and bottom corner steel bars; among which,

[0019] The outer top steel bars, side wing steel bars, and peripheral steel bars are interconnected and arranged outside the outer layer steel bars of the box girder;

[0020] The inner top steel bars, the top corner steel bars, the side steel bars, the bottom corner steel bars, and the inner bottom steel bars are interconnected and are respectively arranged inside the inner layer steel bars of the box.

[0021] A manufacturing method of a box girder includes the following steps:

[0022] Step A, designing the box girder drawings;

[0023] Step B, designing and processing the formwork of the box girder;

[0024] Step C, assembling the formwork and setting up the steel bar binding jig;

[0025] Step D, automatically processing the longitudinal steel bars and the binding steel bars;

[0026] Step E: Position and tie the longitudinal and binding steel bars of the middle section, variable section, and beam end section of the box girder according to the same cross-sectional outer contour of the middle section, variable section, and beam end section of the box girder, and the structure that the thicknesses of the four walls of the box body of the box girder gradually increase from the middle section in the middle to the beam end sections at both ends, and the volume of the corresponding accommodation cavity gradually decreases.

[0027] Step F: Lift the steel cage of the box girder to the formwork, and pour the concrete at the box body and the flank of the middle section, variable section, and beam end section of the box girder to complete the construction of the box girder.

[0028] Preferably, the said Step D further includes the following steps:

[0029] Step D1: Set the automatic steel bar processing machine program on the equipment for automatic processing and tying of steel bars.

[0030] Step D2: Automatically process the large samples of the inner steel bars, outer steel bars, and binding steel bars.

[0031] Preferably, the said Step E further includes the following steps:

[0032] Step E1: Position the outer steel bars of the box body and the flank of the middle section, variable section, and beam end section of the box girder according to the same cross-sectional outer contour of the middle section, variable section, and beam end section of the box girder.

[0033] Step E2: Position the inner steel bars of the box body of the middle section, variable section, and beam end section of the box girder respectively according to the structure that the thicknesses of the four walls of the box body of the box girder gradually increase from the middle section in the middle to the beam end sections at both ends, and the volume of the corresponding accommodation cavity gradually decreases.

[0034] Step E3: Automatically position and tie the outer top steel bars, flank steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, and bottom corner steel bars of the middle section of the box girder.

[0035] Step E4: Sequentially and automatically position and tie the outer top steel bars, flank steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, top corner steel bars, and bottom corner steel bars of the variable section of the box girder.

[0036] Step E5: Automatically position and tie the outer top steel bars, flank steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, top corner steel bars, and bottom corner steel bars of the beam end section of the box girder.

[0037] As can be seen above, in the box girder and its manufacturing method of the present invention, by providing variable sections and beam end sections at both ends of the box girder and reasonably setting the cross-sectional structure at both ends of the box girder, the box girder can be adapted to the equipment for automated processing and steel bar binding, without the need to improve the equipment for automated processing and steel bar binding, reducing the technical difficulty of the equipment for automated processing and steel bar binding, saving costs, realizing the mechanized and automated processing and binding of the steel bars of the box girder, thereby reducing the intervention of manual labor and improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a longitudinal sectional view of the box girder in the embodiment of the present invention.

[0039] Figure 2 is Figure 1 the sectional view at A-A in

[0040] Figure 3 is Figure 1 the sectional view at B-B in

[0041] Figure 4 is Figure 1 the sectional view at C-C in

[0042] Figure 5 is Figure 1 the sectional view at D-D in

[0043] Figure 6 It is a flowchart of the manufacturing method of the box girder in the embodiment of the present invention.

[0044] Figure 7 It is a flowchart of the automated processing of steel bars in the embodiment of the present invention.

[0045] Figure 8 It is a flowchart of the positioning and binding of steel bars in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] In order to make the technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] As Figures 1 to 5 shown, the present invention provides a box girder, including: an intermediate section 1, at least two variable sections 2, and two beam end sections 3;

[0048] The intermediate section 1 is located in the middle of the box girder, and at least one variable section 2 is provided at each end of the intermediate section 1; the two beam end sections 3 are respectively provided at both ends of the box girder and are connected to the variable section 2;

[0049] The middle section 1, the variable section 2 and the beam end section 3 all include a box body 101 with a receiving cavity 100 in the middle. The top of the box body 101 extends to both sides perpendicular to the extending direction of the box girder, forming two side wings 200;

[0050] Among them, the outer contour cross-sections of the middle section 1, the variable section 2 and the beam end section 3 are all the same. The thicknesses of the four walls of the box body 101 of the box girder increase successively from the middle section in the middle to the beam end section at both ends, and the volumes of the corresponding receiving cavities 100 decrease successively;

[0051] Longitudinal steel bars arranged along the extending direction of the box girder are respectively arranged in the four walls and the side wings 200 of the box body 101 of the middle section 1, the variable section 2 and the beam end section 3, and binding steel bars for binding the longitudinal steel bars are respectively arranged at intervals in the direction perpendicular to the longitudinal steel bars.

[0052] In the technical solution of the present invention, by setting the outer contour cross-sections of the middle section 1, the variable section 2 and the beam end section 3 to be equal, and by successively increasing the wall thickness of the four walls of the box body 101 and successively decreasing the receiving cavity 100, it is possible to make the shape of each section a regular shape while meeting the stress performance of the box girder structure, without having to set the two ends of the box girder as a gradually changing structure. Therefore, the longitudinal steel bars inside each section of the box girder are also arranged in the horizontal direction, without having to set a slope or inclination angle. Therefore, due to the regular shapes of the various sections of the box girder and the arrangement of the longitudinal steel bars, it is possible to enable the equipment for automatic processing and binding of steel bars to automatically process and bind the steel bars (for example, the equipment for automatic processing and binding of steel bars can bend ordinary steel bars into binding steel bars that can adapt to the shape of the longitudinal steel bar binding), and further, the equipment for automatic processing and binding of steel bars can use the binding steel bars to bind the longitudinal steel bars, without having to improve the equipment for automatic processing and binding of steel bars, reducing the technical difficulty of the equipment for automatic processing and binding of steel bars, thereby reducing manual intervention, improving the construction efficiency, and reducing the investment.

[0053] It can be seen from this that the present invention adapts the box girder to the equipment for automatic processing and binding of steel bars by improving the structural form of the beam end of the box girder, thereby breaking the traditional concept of realizing the processing and binding of steel bars at the irregular beam end of the box girder by improving the equipment for automatic processing and binding of steel bars, improving the construction efficiency and binding accuracy, and saving costs.

[0054] In the technical solution of the present invention, a variety of implementation methods can be used to implement the above box girder. The following will take one of the implementation methods as an example to introduce the technical solution of the present invention in detail.

[0055] For example, preferably, in a specific embodiment of the present invention, as Figures 2 to 5 shown, the longitudinal steel bars include: outer layer steel bars 11 and inner layer steel bars 12;

[0056] The outer layer of steel bars 11 is arranged along the outer contour of the box girder, within the outer edges of the four walls and the side wings 200 of the box body 101, and runs through the entire box girder;

[0057] The inner layer of steel bars 12 is arranged along the contours of the respective accommodation cavities 100 of the middle section 1, the variable section 2, and the beam end section 3, within the inner edges of the four walls of the box body 101 of the middle section 1, the variable section 2, and the beam end section 3.

[0058] In the technical solution of the present invention, outer layer steel bars and inner layer steel bars are provided in the beam body along the extending direction of the box girder. The double-layer steel bars jointly ensure the strength and reliability of the box girder; the outer layer steel bars 11 run through the entire box girder, making the box girder a whole stressed main body. At the same time, as the wall thickness of the box body 101 changes, the inner layer steel bars always respectively run through the inner edges of the four walls of each section. The longitudinal steel bars do not need to be inclined or bent, thus not only ensuring the stress of the box girder, but also facilitating the steel bar binding by the equipment for automatic processing and binding of steel bars.

[0059] For another example, preferably, in the specific embodiment of the present invention, as Figure 2 shown, the binding steel bars of the middle section 1 may include: an outer top steel bar 13, a side wing steel bar 14, a peripheral steel bar 15, an inner top steel bar 16, two side steel bars 17, an inner bottom steel bar 18, and a bottom corner steel bar 19; wherein,

[0060] The outer top steel bar 13, the side wing steel bar 14, and the peripheral steel bar 15 are connected to each other and are arranged outside the outer layer of steel bars 11 of the box girder;

[0061] One end of the side wing steel bar 14 is bent upward to form a bent portion 141, and is located inside the inner layer of steel bars 12 at the top corner of the box body 101;

[0062] The inner top steel bar 16, the bent portion 141 of the side wing steel bar, the two side steel bars 17, the inner bottom steel bar 18, and the bottom corner steel bar 19 are connected to each other and are respectively arranged inside the inner layer of steel bars 12 of the box body 101.

[0063] In the technical solution of the present invention, for the middle section 1, an automatic processing and steel bar binding device can be used to bind and connect the outer top steel bar 13, the side wing steel bar 14, and the peripheral steel bar 15 to each other, so that the outer layer of steel bars 11 of the box girder can be firmly bound by the outer top steel bar 13, the side wing steel bar 14, and the peripheral steel bar 15. By bending one end of the side wing steel bar 14 upward, the binding steel bars at the top corner can be omitted, and the inner layer of steel bars of the middle section can be firmly bound by binding and connecting the inner top steel bar 16, the bent portion 141 of the side wing steel bar, the two side steel bars 17, the inner bottom steel bar 18, and the bottom corner steel bar 19 to each other. During the entire processing and binding process, no manual intervention is required, effectively improving the construction efficiency.

[0064] In addition, as an example, in a preferred specific embodiment of the present invention, as Figures 3 to 5 shown, the binding steel bars of the variable section 2 and the beam end section 3 may respectively include: an outer top steel bar 13, a side wing steel bar 14a, an outer peripheral steel bar 15, an inner top steel bar 16, two side steel bars 17, an inner bottom steel bar 18, a top corner steel bar 10, and a bottom corner steel bar 19; wherein,

[0065] The outer top steel bar 13, the side wing steel bar 14a, and the outer peripheral steel bar 15 are connected to each other and are arranged outside the outer layer steel bars 11 of the box girder.

[0066] The inner top steel bar 16, the top corner steel bar 10, the two side steel bars 17, the bottom corner steel bar 19, and the inner bottom steel bar 18 are connected to each other and are respectively arranged inside the inner layer steel bars 12 of the box body 101.

[0067] In the technical solution of the present invention, for the variable section 2 and the beam end section 3, equipment for automatic processing and binding of steel bars can be used to bind and connect the outer top steel bar 13, the side wing steel bar 14, and the outer peripheral steel bar 15 to each other, so that the outer layer steel bars 11 of the box girder can be firmly bound by the outer top steel bar 13, the side wing steel bar 14, and the outer peripheral steel bar 15; and the inner layer steel bars of the variable section 2 and the beam end section 3 are firmly bound by binding and connecting the inner top steel bar 16, the top corner steel bar 10, the two side steel bars 17, the bottom corner steel bar 19, and the inner bottom steel bar 18 to each other. Since the thickness of the four walls of the box body 101 of the variable section 2 and the beam end section 3 gradually increases, it is not convenient to bend one end of the side wing steel bar to replace the inner layer binding steel bar at the top corner. Therefore, a separate top corner steel bar is provided to jointly bind the inner layer steel bars of the box body with the inner top steel bar 16, etc.

[0068] In addition, the number of variable sections 2 can be increased or decreased according to the actual stress conditions of the box girder structure. For example, in a preferred specific embodiment of the present invention, two mutually connected variable sections 2 can be respectively arranged at each end of the middle section 1.

[0069] In summary, in the technical solution of the present invention, by arranging variable sections and beam end sections at both ends of the box girder and reasonably setting the cross-sectional structure at both ends of the box girder, the box girder can be adapted to the equipment for automatic processing and binding of steel bars, without the need to improve the equipment for automatic processing and binding of steel bars, reducing the technical difficulty of the equipment for automatic processing and binding of steel bars and saving costs; further, since the structures of each section of the box girder are regular, the types of shapes of the steel bars can be reduced, and no manual intervention is required during the processing and binding of the steel bars, effectively improving the construction efficiency.

[0070] In addition, as an example, in a preferred specific embodiment of the present invention, as Figure 6 shown, a manufacturing method of the above box girder is further provided, which may include the following steps:

[0071] Step 101: Design the drawings of the box girder;

[0072] Step 102: Design and process the formwork of the box girder;

[0073] Step 103: Assemble the formwork and set up the steel bar binding fixtures;

[0074] Step 104: Automatically process and bind the longitudinal steel bars;

[0075] Step 105: According to the structure that the cross-sectional outer contours of the middle section, variable section and beam end section of the box girder are the same, and the thicknesses of the four walls of the box body of the box girder gradually increase from the middle section in the middle to the beam end sections at both ends, and the volume of the corresponding accommodation cavity gradually decreases, position and bind the longitudinal steel bars and binding steel bars of the middle section, variable section and beam end section of the box girder;

[0076] Step 106: Lift the steel bar cage of the box girder to the formwork, and pour the concrete at the box body and the side wings of the middle section, variable section and beam end section of the box girder to complete the construction of the box girder.

[0077] In the technical solution of the present invention, a variety of implementation methods can be used to implement the above method for manufacturing the box girder.

[0078] For example, in a specific embodiment of the present invention, as Figure 7 shown, Step 104 may further include the following steps:

[0079] Step 41: Set up an automatic steel bar processing mechanical program on the equipment for automatically processing and binding steel bars;

[0080] Step 42: Automatically process the inner layer steel bars, outer layer steel bars and large samples of binding steel bars.

[0081] Again, for example, in a specific embodiment of the present invention, as Figure 8 shown, Step 105 may further include the following steps:

[0082] Step 51: According to the structure that the cross-sectional outer contours of the middle section, variable section and beam end section of the box girder are the same, position the outer layer steel bars of the box body and the side wings of the middle section, variable section and beam end section of the box girder;

[0083] Step 52: According to the structure that the thicknesses of the four walls of the box body of the box girder gradually increase from the middle section in the middle to the beam end sections at both ends, and the volume of the corresponding accommodation cavity gradually decreases, respectively position the inner layer steel bars of the box body of the middle section, variable section and beam end section of the box girder;

[0084] Step 53: Automatically position and bind the outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars and bottom corner steel bars of the middle section of the box girder;

[0085] Step 54: Automatically position and tie the outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, two-side steel bars, inner bottom steel bars, top corner steel bars and bottom corner steel bars of the variable section of the box girder in sequence;

[0086] Step 55: Automatically position and tie the outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, two-side steel bars, inner bottom steel bars, top corner steel bars and bottom corner steel bars of the beam end section of the box girder.

[0087] In summary, through the above method for automatic processing and tying of the steel bars of the box girder, mechanized and automatic processing and tying of the steel bars of the box girder can be realized by using intelligent devices, thereby reducing the intervention of manual labor and improving the construction efficiency.

[0088] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A box girder, characterized in that, Including: An intermediate section, at least two variable sections, and two beam end sections; The intermediate section is located in the middle of the box girder. At least one variable section is provided at each end of the intermediate section; the two beam end sections are respectively provided at the two ends of the box girder and are connected to the variable sections; The intermediate section, the variable section, and the beam end section all include a box body with a receiving cavity in the middle. The top of the box body extends to both sides perpendicular to the extending direction of the box girder, forming two side wings; Wherein, the outer contour of the cross-section of the intermediate section, the variable section, and the beam end section is the same. The thickness of the four walls of the box body of the box girder gradually increases from the intermediate section in the middle to the beam end sections at both ends, and the volume of the corresponding receiving cavity gradually decreases; Longitudinal steel bars arranged along the extending direction of the box girder are respectively provided in the four walls and the side wings of the box bodies of the intermediate section, the variable section, and the beam end section. And in the direction perpendicular to the longitudinal steel bars, binding steel bars for binding the longitudinal steel bars are respectively arranged at intervals; Wherein, the longitudinal steel bars include: outer layer steel bars and inner layer steel bars; The outer layer steel bars are arranged along the outer contour of the box girder, inside the outer edges of the four walls and the side wings of the box body, and penetrate through the entire box girder; The inner layer steel bars are arranged along the contour of the receiving cavity of the intermediate section, the variable section, and the beam end section respectively, inside the inner edges of the four walls of the box bodies of the intermediate section, the variable section, and the beam end section; Wherein, the binding steel bars of the intermediate section include: outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, and bottom corner steel bars; wherein, The outer top steel bars, the side wing steel bars, and the peripheral steel bars are connected to each other and are arranged outside the outer layer steel bars of the box girder; One end of the side wing steel bar is bent upward to form a bent portion, and is located inside the inner layer steel bars at the top corner of the box body; The inner top steel bars, the bent portions of the side wing steel bars, the side steel bars, the inner bottom steel bars, and the bottom corner steel bars are connected to each other and are respectively arranged inside the inner layer steel bars of the box body; Wherein, the binding steel bars of the variable section and the beam end section respectively include: outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, top corner steel bars, and bottom corner steel bars; wherein, The outer top steel bars, the side wing steel bars, and the peripheral steel bars are connected to each other and are arranged outside the outer layer steel bars of the box girder; The inner top steel bars, the top corner steel bars, the side steel bars, the bottom corner steel bars, and the inner bottom steel bars are connected to each other and are respectively arranged inside the inner layer steel bars of the box body.

2. A manufacturing method of the box girder as described in claim 1, characterized in that Including the following steps: Step A, designing the drawing of the box girder; Step B, designing and processing the formwork of the box girder; Step C, assembling the formwork and erecting the steel bar binding jig; Step D, automatically processing the longitudinal steel bars and the binding steel bars; Step E, according to the structure that the outer contour of the cross-section of the intermediate section, the variable section, and the beam end section of the box girder is the same, and the thickness of the four walls of the box body of the box girder gradually increases from the intermediate section in the middle to the beam end sections at both ends, and the volume of the corresponding receiving cavity gradually decreases, positioning and binding the longitudinal steel bars and the binding steel bars of the intermediate section, the variable section, and the beam end section of the box girder; Step F, hoisting the steel bar cage of the box girder to the formwork, and pouring the concrete at the box body and the side wings of the intermediate section, the variable section, and the beam end section of the box girder, and completing the construction of the box girder.

3. The manufacturing method according to claim 2, wherein The said Step D further includes the following steps: Step D1, setting an automatic steel bar processing mechanical program on the equipment for automatically processing and binding steel bars; Step D2, automatically process the large samples of the inner layer steel bars, outer layer steel bars and binding steel bars.

4. The manufacturing method according to claim 2, characterized in that, The said Step E further includes the following steps: Step E1, according to the same cross-sectional outer contours of the middle section, variable section and beam end section of the box girder, position the outer layer steel bars of the box body and the side wings of the middle section, variable section and beam end section of the box girder; Step E2, according to the structure that the thicknesses of the four walls of the box body of the box girder increase successively from the middle section in the middle to the beam end sections at both ends, and the volumes of the corresponding accommodation cavities decrease successively, position the inner layer steel bars of the box body of the middle section, variable section and beam end section of the box girder respectively; Step E3, automatically position and bind the outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars and bottom corner steel bars of the middle section of the box girder; Step E4, successively and automatically position and bind the outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, top corner steel bars and bottom corner steel bars of the variable section of the box girder; Step E5, automatically position and bind the outer top steel bars, side wing steel bars, peripheral steel bars, inner top steel bars, side steel bars, inner bottom steel bars, top corner steel bars and bottom corner steel bars of the beam end section of the box girder.

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