Bolt hole precision control method for long-span combined section steel-concrete continuous beam

Abstract

The application discloses a bolt perforation precision control method for a large-span combined cross-section steel-concrete continuous beam, and comprises the following steps: S1, prefabricating a plurality of beam bodies, a plurality of box beams and a plurality of I-shaped beams; S2, integrally pre-assembling a single-span bridge; S3, determining the bending moment zero point of the integrally pre-assembled single-span bridge, so that the first-end bolt hole group or the last-end bolt hole group is distributed at the bending moment zero point, and the last-end bolt hole group is divided into a last-end bolt hole group front section and a last-end bolt hole group rear section which are adjacent along the extension direction of the bridge body by a last-end split joint; and S4, detecting the integrally pre-assembled single-span bridge, and if qualified, cutting the corresponding beam body along the first-end split line and the last-end split joint, and splitting the beam body into a bridge precast component with corresponding end heads; the bolt perforation precision of a large-area bolt group in the large-span combined cross-section steel-concrete continuous beam can be overcome, and the engineering quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of engineering, and specifically to a method for controlling the bolt perforation accuracy of a large-span composite section steel-concrete continuous beam. Background Technology

[0002] With the increasing prevalence of steel-concrete composite beams in urban road and bridge construction, these beams offer significant advantages such as light weight, high load-bearing capacity, high stiffness, good seismic resistance, reduced formwork usage, rapid construction, and overall good benefits. However, for highway bridges with large spans and road widths, or approach spans of cross-river bridges, the structural design often adopts a continuous multi-span large-section steel box girder composite cross-section, commonly in the form of a fully bolted combination of "box girder + I-beam." For the construction of large-span composite cross-section steel-concrete continuous beams with a fully bolted composite structure, controlling the drilling accuracy of large-area bolt groups is crucial to ensuring project quality and represents a critical construction challenge that urgently needs to be addressed.

[0003] Therefore, to solve the above problems, a method for controlling the bolt perforation accuracy of large-span composite section steel-concrete continuous beams is needed to overcome the perforation accuracy of large-area bolt groups in large-span composite section steel-concrete continuous beams, thereby ensuring the quality of the project. Summary of the Invention

[0004] In view of this, the purpose of this invention is to overcome the defects in the prior art and provide a method for controlling the bolt perforation accuracy of large-span composite section steel-concrete continuous beams, which can overcome the perforation accuracy of large-area bolt groups in large-span composite section steel-concrete continuous beams, thereby ensuring the quality of the project.

[0005] The present invention provides a method for controlling the bolt penetration accuracy of a long-span composite section steel-concrete continuous beam, comprising several box girders and several I-beams, wherein the box girders and I-beams are arranged alternately along the extension direction of the bridge body, and further comprising a crossbeam connecting the several box girders and several I-beams to form an integral crossbeam, wherein the crossbeam comprises several crossbeam body segments, and adjacent box girders and I-beams are connected by a crossbeam body segment.

[0006] The crossbeam body has a first section for connecting with a box girder and a last section for connecting with an I-beam. The first section of the crossbeam body has a group of first-end bolt holes for high-strength bolt group I to pass through, and the last section of the crossbeam body has a group of last-end bolt holes for high-strength bolt group II to pass through.

[0007] It also includes the following construction steps:

[0008] S1. Precast several sections of crossbeam body, several box girders and several I-beams;

[0009] S2. Single-span bridge pre-assembly;

[0010] S3. Determine the overall bending moment zero point of the pre-assembled single-span bridge, so that the first-end bolt hole group or the last-end bolt hole group is distributed at the bending moment zero point. The first-end bolt hole group is divided by the first-end dividing joint into a front section and a rear section of the first-end bolt hole group that are adjacent along the extension direction of the bridge body. The last-end bolt hole group is divided by the last dividing joint into a front section and a rear section of the last-end bolt hole group that are adjacent along the extension direction of the bridge body.

[0011] S4. After the overall pre-assembly of a single bridge, conduct an overall inspection. If the inspection is qualified, cut the corresponding crossbeam body along the first end dividing line and the last end dividing seam to disassemble it into bridge prefabricated components with corresponding ends. If the inspection is not qualified, repeat step S2.

[0012] S5. Post-process the precast bridge components. If they pass the inspection, transport them to the site. If they fail the inspection, re-process them or transport them to the designated location.

[0013] S6. After arranging the permanent piers on the side spans and the permanent piers in the middle span, temporary supports are set up at the sections of the precast components of the bridge body along the extension direction of the bridge body. The temporary supports are pre-lifted so that the steel box girder in the middle span does not come into contact with the permanent pier in the middle span during installation.

[0014] S7. The prefabricated bridge components are connected and assembled sequentially along the set direction using the corresponding cover plates and the corresponding high-strength bolt groups I / II to form a whole.

[0015] S8. After the unloading process is carried out on the bridge body that forms a whole, the temporary supports are removed.

[0016] Furthermore, in step S2, during assembly, a preset number of box beams and a preset number of I-beams are arranged in their respective designated positions, and adjacent box beams and I-beams are connected sequentially along a designated direction through corresponding crossbeam bodies, so that several crossbeam bodies connect several box beams and several I-beams to form a whole.

[0017] Furthermore, in step S4, the items to be tested include at least the bolt perforation rate, bridge camber, and the transverse and longitudinal slopes of the bridge deck.

[0018] Furthermore, in step S5, the post-processing includes at least sanding and coating processes.

[0019] The beneficial effects of this invention are as follows: This invention discloses a method for controlling the bolt hole drilling accuracy of a large-span composite section steel-concrete continuous beam. During workshop fabrication, the first and last sections of the crossbeam are fabricated integrally with the crossbeam, and the high-strength bolt groups are drilled as a whole. Single-span steel box girders are pre-assembled. During on-site installation, temporary supports are set up at the segmented installation locations. These temporary supports are pre-lifted to prevent the mid-span steel box girder from contacting the permanent pier during installation. This transforms the three-point stress distribution during mid-span steel box girder installation into a two-point stress distribution, allowing both ends of the box girder to rotate, which facilitates bolt hole alignment adjustment. The comprehensive application of multiple technical measures ensures the drilling accuracy of the large-area bolt groups in the large-span composite section steel-concrete continuous beam, improving project quality. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 A schematic diagram of the cross-sectional structure of a large-span composite section steel-concrete continuous beam;

[0022] Figure 2 A schematic diagram showing the overall fabrication and hole making of the crossbeam and the first and last sections of the crossbeam body;

[0023] Figure 3 This is a schematic diagram of the overall pre-assembly steps for steel box girders;

[0024] Figure 4 Schematic diagram of steel box girder installation conditions. Detailed Implementation

[0025] Figure 1 As shown in the figure, the bolt perforation accuracy control method for large-span composite section steel-concrete continuous beam in this embodiment includes several box girders and several I-beams 12. The box girders and I-beams 12 are arranged alternately along the extension direction of the bridge body. It also includes a crossbeam 13 that connects several box girders and several I-beams 12 to form an integral crossbeam. The crossbeam 13 includes several crossbeam body segments. Adjacent box girders and I-beams 12 are connected by a crossbeam body segment.

[0026] The crossbeam body has a first section 5 for connecting with a box girder and a last section 6 for connecting with an I-beam 12. The first section 5 of the crossbeam body has a group of first-end bolt holes for high-strength bolts 14 group I to pass through, and the last section 6 of the crossbeam body has a group of last-end bolt holes for high-strength bolts 14 group II to pass through.

[0027] It also includes the following construction steps:

[0028] S1. Precast several sections of crossbeam body, several box beams and several I-beams 12;

[0029] S2. The single-span bridge is pre-assembled to form a continuous steel box girder 1;

[0030] S3. Determine the overall bending moment zero point of the pre-assembled single-span bridge, so that the first-end bolt hole group or the last-end bolt hole group is distributed at the bending moment zero point. The first-end bolt hole group is divided by the first-end dividing joint 7 into a first-end bolt hole group front section and a first-end bolt hole group rear section adjacent to each other along the extension direction of the bridge body. The last-end bolt hole group is divided by the last dividing joint 8 into a last-end bolt hole group front section and a last-end bolt hole group adjacent to each other along the extension direction of the bridge body.

[0031] S4. After the overall pre-assembly of a single bridge, if the overall inspection is qualified, the corresponding crossbeam body is cut along the first end dividing line and the last end dividing joint 8 and disassembled into bridge prefabricated components with corresponding ends. If the inspection is not qualified, step S2 is repeated.

[0032] S5. Post-process the precast bridge components. If they pass the inspection, transport them to the site. If they fail the inspection, re-process them or transport them to the designated location.

[0033] S6. After arranging the permanent piers 2 on the side spans and the permanent piers 3 in the middle span, temporary supports 4 are set at the sections of the precast components of the bridge body along the extension direction of the bridge body. The temporary supports 4 are pre-lifted so that the steel box girder in the middle span section does not come into contact with the permanent piers 3 in the middle span during installation.

[0034] S7. The prefabricated bridge components are connected and assembled in sequence along the set direction using the corresponding cover plates and the corresponding high-strength bolts 14 groups I / 14 groups II to form a whole.

[0035] S8. After the unloading process of the bridge body that forms a whole, remove the temporary support 4.

[0036] In this embodiment, in step S2, during assembly, a preset number of box beams and a preset number of I-beams 12 are arranged in their respective corresponding positions, and adjacent box beams and I-beams 12 are connected sequentially along a set direction through corresponding crossbeam bodies, so that several crossbeam bodies connect several box beams and several I-beams 12 to form a whole.

[0037] In this embodiment, in step S4, the items to be detected include at least the bolt perforation rate, bridge camber, and the transverse and longitudinal slopes of the bridge deck.

[0038] In this embodiment, step S5 includes at least sanding and coating processes.

[0039] This solution is achieved through technologies such as "overall pre-assembly and temporary support 4-stage pre-lifting":

[0040] During workshop production, the crossbeam body, consisting of the first section 5 and the last section 6 of the crossbeam body, is manufactured as a single unit, and holes are drilled at the preset zero bending moment point to ensure the accuracy of the hole positions for the 14 groups of high-strength bolts.

[0041] After the prefabricated components of each segment of the bridge are manufactured, they are pre-assembled as a whole to ensure the bolt perforation rate and the bridge pre-camber. The zero point of the bending moment of the large-span steel-concrete continuous beam is used as the segment installation position point, and temporary supports 4 are set at the segment installation position point. The temporary supports 4 are pre-lifted so that the steel box girder in the middle of the span does not contact the permanent pier 3 in the middle of the span during installation. This changes the three-point force of the steel box girder in the middle of the span to a two-point force, and both ends of the box can rotate, which is conducive to the control of the bolt hole installation accuracy.

[0042] like Figure 1 As shown, in the long-span composite section steel-concrete continuous beam, the longitudinal single cross section is formed by three box beams 11 and two I-beams 12, which are arranged alternately. The box beams 11 and the I-beams are connected by high-strength bolts 14 through the main and secondary cross beams 13 to form a fully bolted combination of "box beams 11 + I-beams 12".

[0043] like Figure 2 As shown, during step S1, the first section 5 and the last section 6 of the crossbeam body are fabricated as a whole with the crossbeam 13 in the workshop, and holes are made at the preset zero bending moment point to ensure the accuracy of the hole positions of the high-strength bolts 14 group.

[0044] like Figure 3 As shown, in the long-span composite section steel-concrete continuous beam, after the prefabricated components of each segment of the bridge body are manufactured, the entire single-span pre-assembly is carried out, and the first segment 5 or the last segment 6 of the crossbeam body located at the preset position is welded to the corresponding node positions of the box beam 11 and the I-beam 12.

[0045] More specifically, the prefabricated box girder 11 and I-beam 12 segment components are first placed on the jigs in the correct positions, and then pre-assembled. The pre-assembly process is as follows: ① Assemble box girder G1111 with I-beam L1121; ② Assemble box girder G2112 with I-beam L1121; ③ Assemble box girder G2112 with I-beam L2122; ④ Assemble box girder G3113 with I-beam L2122.

[0046] During the pre-assembly of a single beam, the bolt perforation rate, bridge camber, and transverse and longitudinal slopes of the bridge deck are ensured. After the pre-assembly inspection is qualified, the web of the first section 5 / last section 6 of the beam body and the web 134 of the beam body, and the lower flange of the first section 5 / last section 6 of the beam body and the lower flange 132 of the beam body are cut along the separation joint. After being disassembled into segmented components, they are ground, painted, and transported to the site after passing inspection. It should be noted that in this scheme, the two ends of the upper flange 131 of the beam body are exactly located between two separation joints that are close to each other along the extension direction of the bridge. Generally, a beam body has two separation joints (first end separation joint 7 and last end separation joint), and the separation joint is located at the preset zero bending moment point. Furthermore, the separation joint separates the high-strength bolts 14, thereby meeting the control of bolt hole installation accuracy and improving assembly quality.

[0047] like Figure 4 As shown, in the long-span composite section steel-concrete continuous beam, when the steel box girder is installed on site, temporary supports 4 are set at the segmented installation points of the precast components of the bridge body. The temporary supports 4 are pre-lifted so that the steel box girder in the middle span does not contact the permanent pier 3 in the middle span during installation. This changes the three-point force of the steel box girder in the middle span to two-point force, and both ends of the box can rotate, which is beneficial to the control of the bolt hole installation accuracy.

[0048] Because the prefabricated components of the bridge body in this scheme are formed in a different way, the assembly of the prefabricated components in this scheme is closer to the pre-set result. The pre-assembly method ensures the drilling accuracy of the large-area bolt group of the large-span composite section steel-concrete continuous beam, thus improving the quality of the project.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for controlling the bolt perforation accuracy of a long-span composite section steel-concrete continuous beam, characterized in that: It includes several box girders and several I-beams, which are arranged alternately along the extension direction of the bridge body. It also includes a crossbeam that connects the box girders and several I-beams to form a whole. The crossbeam includes several crossbeam body segments, and adjacent box girders and I-beams are connected by a crossbeam body segment. The crossbeam body has a first section for connecting with a box girder and a last section for connecting with an I-beam. The first section of the crossbeam body has a group of first-end bolt holes for high-strength bolt group I to pass through, and the last section of the crossbeam body has a group of last-end bolt holes for high-strength bolt group II to pass through. It also includes the following construction steps: S1. Precast several sections of crossbeam body, several box girders and several I-beams; S2. Single-span bridge pre-assembly; S3. Determine the overall bending moment zero point of the pre-assembled single-span bridge, so that the first-end bolt hole group or the last-end bolt hole group is distributed at the bending moment zero point. The first-end bolt hole group is divided by the first-end dividing joint into a front section and a rear section of the first-end bolt hole group that are adjacent along the extension direction of the bridge body. The last-end bolt hole group is divided by the last dividing joint into a front section and a rear section of the last-end bolt hole group that are adjacent along the extension direction of the bridge body. S4. After the overall pre-assembly of a single bridge, conduct an overall inspection. If the inspection is qualified, cut the corresponding crossbeam body along the first end dividing line and the last end dividing seam to disassemble it into bridge prefabricated components with corresponding ends. If the inspection is not qualified, repeat step S2. S5. Post-process the precast bridge components. If they pass the inspection, transport them to the site. If they fail the inspection, re-process them or transport them to the designated location. S6. After arranging the permanent piers on the side spans and the permanent piers in the middle span, temporary supports are set up at the sections of the precast components of the bridge body along the extension direction of the bridge body. The temporary supports are pre-lifted so that the steel box girder in the middle span does not come into contact with the permanent pier in the middle span during installation. S7. The prefabricated bridge components are connected and assembled sequentially along the set direction using the corresponding cover plates and the corresponding high-strength bolt groups I / II to form a whole. S8. After the unloading process is carried out on the bridge body that forms a whole, the temporary supports are removed; In step S2, during assembly, a preset number of box beams and a preset number of I-beams are arranged in their respective designated positions, and adjacent box beams and I-beams are connected sequentially along the designated direction through corresponding crossbeam bodies, so that several crossbeam bodies connect several box beams and several I-beams to form a whole. In step S4, the items to be tested include at least the bolt perforation rate, bridge camber, and the transverse and longitudinal slopes of the bridge deck. In step S5, the post-processing includes at least sanding and coating processes.

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