Variable cross-section continuous beam trial assembly method

Abstract

The invention provides a variable cross-section continuous beam trial assembly method. The variable cross-section continuous beam is provided with a staggered slab and a corner at the beam section connecting position. The variable cross-section continuous beam trial assembly method comprises the following steps that the state considering the elevation and the pre-camber after bridge forming is defined as a first state; in the first state, the line shape of the beam section with the staggered slab and the corner is adjusted to be a smooth transition curve, and a second state is formed; in the second state, the main longitudinal beams are horizontally arranged and continuously matched and spliced; in the first state, the cross beams, the cross braces and the small longitudinal beams are assembled in a matched mode; defining the state of the beam section in the vertical position state after down-warping due to self weight as a third state; and in the third state, the main longitudinal beams, the cross beams, the cross braces and the small longitudinal beams are spliced. According to the variable cross-section continuous beam trial assembly method, trial assembly of the beam sections with staggered platforms and corners at the splicing positions can be facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of bridge manufacturing, in particular to a trial assembly method of a variable-section continuous beam. Background Art

[0002] According to the implementation standards, all steel bridges, especially those with bolt connections, need to be trial-assembled before leaving the factory to check whether the bridge line shape and camber meet the design requirements, whether the connection relationship between the members is correct, whether there is any mutual conflict at the joints, and whether there are any places where it is difficult to tighten the bolts, so as to ensure smooth on-site construction and erection. The general trial assembly methods are roughly divided into: full-hole trial assembly for plate beam bridges, plane trial assembly for truss beam bridges, and continuous matching trial assembly for combined beams.

[0003] An existing designed bridge has a main longitudinal beam manufacturing line shape with misalignment and corners at the beam segment joints due to the influence of the beam segment erection sequence, erection plan and hanging point positions. However, there is currently no mature trial connection and assembly process specifically for such steel bridges with misalignment and corners at home and abroad, and the traditional trial assembly method cannot meet the trial assembly requirements of such steel bridges. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a trial assembly method for a variable-section continuous beam to solve the problem that the traditional trial assembly method in the prior art cannot meet the trial assembly requirements of a variable-section continuous beam with staggered platforms and corners.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A trial assembly method for a variable cross-section continuous beam, wherein the variable cross-section continuous beam is provided with a stagger and a corner at a beam section connection, and the trial assembly method for the variable cross-section continuous beam comprises the following steps:

[0007] The state considering the elevation and pre-camber of the completed bridge is defined as the first state;

[0008] In the first state, the line shape of the beam section with misalignment and corner is adjusted into a smooth transition curve to form a second state;

[0009] In the second state, the main longitudinal beams are arranged horizontally and assembled in a continuous matching manner;

[0010] In the first state, the cross beam, the cross brace and the small longitudinal beam are matched and assembled;

[0011] The state of the beam segment after deflection due to its own weight in the standing state is defined as the third state;

[0012] In the third state, the main longitudinal beam, the cross beam, the cross brace and the small longitudinal beam are assembled.

[0013] Furthermore, the step of “adjusting the linear shape of the beam segments with misalignment and corners into a smooth transition curve in the first state” specifically includes the following steps:

[0014] First, rotate a beam segment with a corner at the joint interface with the centroid of its cross section at the joint interface as the rotation axis until it is parallel to the end face of the other beam segment, and adjust the gap at the joint interface;

[0015] Then adjust the misaligned joints to a smooth state.

[0016] Furthermore, the “laying out the main longitudinal beams in a horizontal position and continuously matching and assembling them in the second state” specifically includes the following steps:

[0017] Arrange the main longitudinal beams on the same axis in sequence, adjust and check the line shape, review and approve the measurement data at the stop points, match all the hole groups at the drilled and spliced ​​interfaces, and mark the connecting plates.

[0018] Further, the "matching all hole groups at the drilling and splicing interface" specifically includes the following steps:

[0019] First, full holes are drilled in the two beam sections respectively, a hole group is drilled in one side of the splicing plate, and then the hole group is drilled in the other side of the splicing plate; or, full holes are drilled in both sides of the splicing plate and one of the beam sections respectively, and then the hole group of the other beam section is drilled.

[0020] Furthermore, the “matching and assembling the cross beam, the cross brace and the small longitudinal beam in the first state” specifically includes the following steps:

[0021] In the first state, the remaining hole groups between the crossbeam sections are matched and drilled, and the crossbeam, the cross brace and the small longitudinal beam are matched and assembled.

[0022] Furthermore, the “matching and drilling the remaining hole groups between the beam sections in the first state” specifically includes the following steps:

[0023] Before trial assembly, full holes are drilled in the flange plate and web plate, all splicing plates and all filling plates on one side of the beam segment, and the hole group of the flange plate and web plate on the other side of the beam segment is matched and drilled in the first state.

[0024] Furthermore, the “assembling the main longitudinal beam, the cross beam, the cross brace and the small longitudinal beam in the third state” specifically includes the following steps:

[0025] The cross beam and the main longitudinal beam are placed upright on the tire frame, adjusted to the third state, and accurately adjusted according to the preset coordinates, at which time the cross beam and the main longitudinal beam, as well as the main longitudinal beam sections, are not connected in the longitudinal direction;

[0026] While placing the main longitudinal beam, sequentially install the transverse brace and the small longitudinal beam corresponding to the main longitudinal beam, and match and drill all remaining holes on the transverse brace and the small longitudinal beam during the trial assembly process;

[0027] The main longitudinal beam, the cross beam, the cross brace and the small longitudinal beam are assembled.

[0028] Furthermore, all the hole groups of all the component rods of the cross brace are drilled in the manufacturing stage, and the hole groups on the cross brace splicing plate on the main longitudinal beam are matched and drilled during the trial assembly process.

[0029] Furthermore, full holes are drilled at both ends of the small longitudinal beam section, a hole group is drilled on one side of the splicing plate, and then a hole group is drilled on the other side of the splicing plate in a matching manner.

[0030] Furthermore, full holes are drilled on both sides of the splicing plate and one end of the small longitudinal beam segment, and a group of holes is drilled at the other end of the small longitudinal beam segment to match.

[0031] According to the technical solution of the present invention, the trial assembly method of the variable cross-section continuous beam of the present invention divides the elevation in the whole bridge manufacturing process into three states. In the first state, the beam sections with misalignment and corners are adjusted to the second state of uniformity and smoothness. In the second state, the main longitudinal beams can be matched and assembled to avoid mutual interference between the beam sections with misalignment and corners during assembly, thereby improving the accuracy and speed of assembly. In the first state, the cross beams, cross braces and small longitudinal beams are matched and assembled, and then all the rods are trial assembled in the third state. The trial assembly method of the variable cross-section continuous beam of the present invention is simple to operate, and is convenient for trial assembly of beam sections with misalignment and corners, ensuring the smooth erection of the steel bridge at the construction site after leaving the factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a plan view of a variable-section continuous beam with staggered steps and corners according to an embodiment of the present invention.

[0033] Figure 2 It is an elevation view of a variable-section continuous beam with staggered steps and corners according to an embodiment of the present invention.

[0034] Figure 3 The present invention is a schematic diagram of the beam segment staggered structure at the joint of a variable-section continuous beam according to an embodiment of the present invention.

[0035] Figure 4 for Figure 3 Schematic diagram of the state when the beam ends collide with each other at the splicing interface.

[0036] Figure 5 for Figure 3 Schematic diagram of the state where the beam segments at the joint are rotated until the beam ends are parallel to each other.

[0037] Figure 6 for Figure 5 Schematic diagram of the beam section at the splicing interface being adjusted to the second state.

[0038] Figure 7 It is a linear schematic diagram when all the joints of the variable-cross-section continuous beam according to an embodiment of the present invention are uniformly adjusted to the second state.

[0039] Figure 8 Schematic diagram of the hole groups between the beam sections of the embodiment of the present invention (only one of the beam sections is shown as an example).

[0040] Fig. 9 Schematic diagram of a group of connection holes of a cross brace according to an embodiment of the present invention.

[0041] Fig.10 Schematic diagram of a group of connecting holes between small longitudinal beam sections according to an embodiment of the present invention.

[0042] The meanings of the symbols in the accompanying drawings are:

[0043] 1. Joint; 2. Crossbeam; 3. Cross brace; 4. Small longitudinal beam; 5. Main longitudinal beam; 6. Beam section; 7. Cloud line. DETAILED DESCRIPTION

[0044] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0046] At the connection of beam section 6, there is a variable cross-section continuous beam with staggered steps and corners. Its plan view is as follows: Figure 1 As shown, the elevation diagram is as follows Figure 2 As shown in the figure, the angle of the beam segment 6 is inconsistent due to the inconsistent angles of the two sections of the same joint interface 1, resulting in inconsistent gaps at the joint interface 1. In fact, the ends of the two beam segments 6 at the joint interface 1 will conflict and interfere with each other, resulting in the inability to successfully try to assemble. Figure 3 As shown in FIG. 1 , the state in which the beam sections 6 conflict with each other due to inconsistent rotation angles is as shown in FIG. Figure 4 shown.

[0047] In order to ensure smooth erection of the bridge at the construction site after leaving the factory, it is necessary to ensure that the joint 1 of the beam segment 6 is smooth and the gap is consistent. However, it is impossible to fully simulate the on-site erection state before leaving the factory. Whether it is misalignment or corners, it is impossible to ensure that the connecting holes of the beam segment 6 are correctly drilled. In order to ensure the hole drilling accuracy and make the on-site erection smooth, the trial assembly method of the variable cross-section continuous beam of this embodiment includes the following steps:

[0048] S1. The state taking into account the elevation and pre-arch after the bridge is completed is defined as the first state.

[0049] S2. In the first state, the linear shape of the beam section 6 with misalignment and corners is adjusted into a smooth transition curve to form a second state.

[0050] S2.1. First, rotate a beam segment 6 with a corner at the joint interface 1 with the centroid of its cross section at the joint interface as the rotation axis until it is parallel to the end face of the other beam segment 6, and adjust the gap at the joint interface 1, such as Figure 5 As shown;

[0051] S2.2, adjust the misaligned joint 1 to a smooth state, such as Figure 6 After all the joints 1 are adjusted, the line shape in the second state is as follows Figure 7 shown.

[0052] S3. In the second state, the main longitudinal beam 5 is arranged horizontally, and is continuously matched and assembled, and all the hole groups at the assembly interface 1 are matched and drilled.

[0053] The trial assembly needs to be carried out on a qualified tire frame, and the rods must be in a stress-free state for trial assembly. The overall process flow of trial assembly is as follows: arrange the main longitudinal beams 5 of the same axis in sequence, adjust and detect the linear shape, stop point to review and approve the measurement data, match all the hole groups at the drilled assembly interface 1, and mark the connecting plate.

[0054] There are two implementation methods for matching and drilling all the hole groups at the joint interface 1. One is to first drill full holes in the two beam sections 6, drill a hole group on one side of the splicing plate, and then match and drill the hole group on the other side of the splicing plate. The other is to first drill full holes on both sides of the splicing plate and one of the beam sections 6, and then match and drill the hole group of the other beam section 6.

[0055] Here, the first drilling method is used as an example for explanation. Before the horizontal trial assembly of the main longitudinal beam 5, the top, bottom and web plates at both ends of the main longitudinal beam 5 are drilled with full holes, and one side hole is drilled on the splicing plate. According to the line shape and coordinates shown in the trial assembly drawing, the hole group on the other side of the splicing plate is matched and drilled.

[0056] S4, in the first state, the cross beam 2, the cross brace 3 and the small longitudinal beam 4 are matched and assembled, and the remaining hole groups between the cross beam sections are matched and drilled.

[0057] Specifically, in the first state, the remaining hole groups between the crossbeam sections are matched and drilled, and the crossbeam 2, the cross brace 3 and the small longitudinal beam 4 are matched and assembled.

[0058] The specific drilling method is as follows: before trial assembly, full holes are drilled on the flange plate and web plate, all splicing plates and all filling plates on one side of the beam segment 2, and the hole group of the flange plate and web plate on the other side of the beam segment 2 is matched and drilled in the first state.

[0059] like Figure 8 As shown, the area within the cloud line 7 represents the hole group of the main beam member that needs to be drilled during the trial installation stage, including the top plate, bottom plate, web plate and rib plate. The hole group area without the cloud line 7 represents the hole group of the top plate, bottom plate, web plate and rib plate of the main beam 2 that already existed before the trial installation.

[0060] S5. The state of the beam segment 6 after deflection due to its own weight in the upright state is defined as the third state.

[0061] S6. In the third state, the main longitudinal beam 5, the cross beam 2, the cross brace 3 and the small longitudinal beam 4 are assembled.

[0062] S6.1. Place the cross beam 2 and the main longitudinal beam 5 on the tire frame in an upright position, adjust them to the third state, and make precise adjustments according to the preset coordinates. At this time, the cross beam 2 and the main longitudinal beam 5, as well as the main longitudinal beam sections, are not connected in the longitudinal direction;

[0063] S6.2, while placing the main longitudinal beam 5, sequentially install the cross brace 3 and the small longitudinal beam 4 corresponding to the main longitudinal beam 5, and match drill all the remaining holes on the cross brace 3 and the small longitudinal beam 4 during the trial assembly process. That is, match drill all the remaining hole groups related to the cross brace 3 and the small longitudinal beam 4 in the third state;

[0064] S6.3, assemble the main longitudinal beam 5, the cross beam 2, the cross brace 3 and the small longitudinal beam 4;

[0065] S6.4. All the hole groups of all the component rods of the cross brace 3 are drilled during the manufacturing stage, and the hole groups on the splicing plate of the cross brace 3 on the main longitudinal beam 5 are matched and drilled during the trial assembly process.

[0066] Which holes need to be drilled before trial assembly of the cross brace 3 and which holes need to be matched and drilled during the trial assembly can be determined according to the specific situation. In this embodiment, in order to ensure that the margins of the holes do not exceed the tolerance, all the rods that make up the cross brace 3, including H-shaped steel, welded T-shaped steel, angle steel and filler plate, etc., are selected to be drilled during the production and manufacturing stage. This can effectively reduce the time required for trial assembly and improve work efficiency. During the trial assembly, it is only necessary to match and drill the hole groups on the splicing plates of the cross brace 3 on the longitudinal beam. All the splicing plates, filler plates, angle steel DC, steel BC and TC2 of all cross braces 3 need to be fully drilled according to the construction drawings before trial assembly. Fig. 9As shown, the positions within the cloud line 7 represent the hole groups that need to be matched with the drilling rods during the trial assembly stage, and the hole group positions without cloud line 7 marks are all hole groups that have been drilled before the trial assembly.

[0067] There are two methods to match the drilling of the hole group at the joint interface 1 of the small longitudinal beam 4. One is to drill full holes at both ends of the small longitudinal beam section, drill a hole group on one side of the splicing plate, and then drill the hole group on the other side of the splicing plate. The other is to drill full holes on both sides of the splicing plate and one end of the small longitudinal beam section, and then drill the hole group on the other end of the small longitudinal beam section. This embodiment uses the latter drilling method. Fig.10 As shown, all the holes at the solid shadow ends and all the holes of the splicing plates are drilled out before the trial assembly, including the upper wing fiber edge plate, the lower wing fiber edge plate and the web plate. The area without solid shadow circles represents the hole group of the top plate, bottom plate and web plate of the small longitudinal beam 4 that already existed before the trial assembly.

[0068] The variable-section continuous beam trial assembly method provided by the present invention can effectively solve the problem of the inability to match the drilling trial assembly caused by the cross-section jump and the corner. At the same time, it can also ensure that the cross braces and the small longitudinal beams are fully drilled before leaving the factory. While ensuring the connection accuracy, it can also effectively reduce the drilling workload at the trial assembly site, thereby improving the work efficiency of the trial assembly.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A trial assembly method for a variable cross-section continuous beam, wherein the variable cross-section continuous beam is provided with a staggered platform and a corner at the connection of the beam sections, characterized in that: The trial assembly method of the variable cross-section continuous beam comprises the following steps: The state considering the elevation and pre-camber of the completed bridge is defined as the first state; In the first state, the line shape of the beam section with misalignment and corner is adjusted into a smooth transition curve to form a second state; In the second state, the main longitudinal beams are arranged horizontally and assembled in a continuous matching manner; In the first state, the cross beam, the cross brace and the small longitudinal beam are matched and assembled; The state of the beam segment after deflection due to its own weight in the standing state is defined as the third state; In the third state, the main longitudinal beam, the cross beam, the cross brace and the small longitudinal beam are assembled.

2. The variable cross-section continuous beam trial assembly method according to claim 1 is characterized in that: The step of "adjusting the linear shape of the beam segments with misalignment and corners into a smooth transition curve in the first state" specifically includes the following steps: First, rotate a beam segment with a corner at the joint interface with the centroid of its cross section at the joint interface as the rotation axis until it is parallel to the end face of the other beam segment, and adjust the gap at the joint interface; Then adjust the misaligned joints to a smooth state.

3. The variable cross-section continuous beam trial assembly method according to claim 1, characterized in that: The "laying out the main longitudinal beams in a horizontal position and continuously matching and assembling them in the second state" specifically includes the following steps: Arrange the main longitudinal beams on the same axis in sequence, adjust and check the line shape, review and approve the measurement data at the stop points, match all the hole groups at the drilled and spliced ​​interfaces, and mark the connecting plates.

4. The variable cross-section continuous beam trial assembly method according to claim 3 is characterized in that: The "matching all hole groups at the drilling and splicing interface" specifically includes the following steps: First, full holes are drilled in the two beam sections respectively, a hole group is drilled in one side of the splicing plate, and then the hole group is drilled in the other side of the splicing plate; or, full holes are drilled in both sides of the splicing plate and one of the beam sections respectively, and then the hole group of the other beam section is drilled.

5. The variable cross-section continuous beam trial assembly method according to claim 1, characterized in that: The "matching and assembling the cross beam, the cross brace and the small longitudinal beam in the first state" specifically includes the following steps: In the first state, the remaining hole groups between the crossbeam sections are matched and drilled, and the crossbeam, the cross brace and the small longitudinal beam are matched and assembled.

6. The variable cross-section continuous beam trial assembly method according to claim 5, characterized in that: The "matching and drilling the remaining hole groups between the beam sections in the first state" specifically includes the following steps: Before trial assembly, full holes are drilled in the flange plate and web plate, all splicing plates and all filling plates on one side of the beam segment, and the hole group of the flange plate and web plate on the other side of the beam segment is matched and drilled in the first state.

7. The variable cross-section continuous beam trial assembly method according to claim 1, characterized in that: The "assembling the main longitudinal beam, the cross beam, the cross brace and the small longitudinal beam in the third state" specifically includes the following steps: The cross beam and the main longitudinal beam are placed upright on the tire frame, adjusted to the third state, and accurately adjusted according to the preset coordinates, at which time the cross beam and the main longitudinal beam, as well as the main longitudinal beam sections, are not connected in the longitudinal direction; While placing the main longitudinal beam, sequentially install the transverse brace and the small longitudinal beam corresponding to the main longitudinal beam, and match and drill all remaining holes on the transverse brace and the small longitudinal beam during the trial assembly process; The main longitudinal beam, the cross beam, the cross brace and the small longitudinal beam are assembled.

8. The variable cross-section continuous beam trial assembly method according to claim 7, characterized in that: All the hole groups of all the constituent rods of the cross brace are drilled during the manufacturing stage, and the hole groups on the cross brace splicing plates on the main longitudinal beams are drilled in a matching manner during the trial assembly process.

9. The variable cross-section continuous beam trial assembly method according to claim 7, characterized in that: Full holes are drilled at both ends of the small longitudinal beam section, a hole group is drilled on one side of the splicing plate, and then a hole group is drilled on the other side of the splicing plate.

10. The variable cross-section continuous beam trial assembly method according to claim 7, characterized in that: Full holes are drilled on both sides of the splicing plate and one end of the small longitudinal beam section, and a group of holes is drilled on the other end of the small longitudinal beam section to match.

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