A manufacturing method for the steel bar component of a precast box girder with a large cross-section

Abstract

The present invention provides a method for manufacturing a large-section precast box girder steel bar component, which comprises the following steps: manufacturing a first circumferential steel bar unit and a second circumferential steel bar unit according to the design dimensions; connecting the first circumferential steel bar unit and the second circumferential steel bar unit according to the design pattern to form a mesh; placing a plurality of meshes for splicing and assembling to form an integral component; positioning the integral component and threading longitudinal main steel bars into the integral component until they pass through, and fixing the meshes with stirrups. The present invention uses a scientific and subdivided method to quickly manufacture steel bar components, with high overall efficiency, while reducing the requirements for the number of construction workers, reducing the labor intensity. The formed meshes and the integral steel bar components have large structural stiffness and small deformation during the hoisting process, and are applicable to the production of long-span box girders.

Description

Technical Field

[0001] The present invention relates to the technical field of the forming of steel bar structures for bridge girders, and particularly to a method for fabricating steel bar components of large-section precast box girders. Background Art

[0002] Transportation accounts for an increasingly large proportion in the national economic development, and bridges are an essential and important part of transportation facilities. With the increasingly mature bridge construction technology, in order to save land resources and increase the traffic capacity of vehicles or ships under and on the bridges, reinforced concrete box girders are also developing towards the trend of longer and wider large box girders, and the steel bar structures of box girders are getting larger and heavier, which brings new challenges to the construction of box girder steel bar structures.

[0003] The steel bar components of large precast box girders have characteristics such as structural interlocking, extra-large span and cross-section, etc. In traditional construction methods, at the construction site of precast beam steel bars, the most common construction method is to manually carry the steel bars into the outer formwork of the precast beam for positioning, binding or welding. The construction intensity is high, the construction efficiency is low, and it is also difficult to ensure the production cycle of precast beam steel bars; due to the large size of precast box girders, a large amount of manpower is required, which belongs to labor-intensive operations, increasing the safety risks at the construction site invisibly; at the same time, due to the uneven technical levels of workers, it is difficult to ensure the construction quality of precast box girder steel bars. Chinese patent document CN 112060307 A records a method for segment box girder short-line matching control and precast construction. This solution adopts a combined assembly scheme, which is relatively troublesome to transport, and there are also problems with inconvenient alignment and locking of connection positions during on-site installation. Summary of the Invention

[0004] The present invention provides a method for fabricating steel bar components of large-section precast box girders, which solves the problems of low production efficiency of steel bar components, high construction difficulty, and difficult to ensure the overall production accuracy.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a method for fabricating steel bar components of large-section precast box girders, including the following steps:

[0006] S1. Fabricate the first circumferential steel bar unit and the second circumferential steel bar unit according to the design dimensions;

[0007] S2. Connect the first circumferential steel bar unit and the second circumferential steel bar unit according to the design pattern to form a mesh;

[0008] S3. Place multiple meshes for splicing and assembling to form an integral component;

[0009] S4. Position the integral component, and insert the longitudinal main steel bars into the integral component until they pass through, and fix the mesh with stirrups.

[0010] In the preferred solution, before S1, the internal structure of the steel box girder component is divided longitudinally along the direction of the main longitudinal reinforcement. The dividing steps are as follows:

[0011] S11. Analyze the dimensions, characteristics of the steel bars in the steel box girder section, and the feasibility of steel bar bending to divide the area into the first circumferential steel bar unit, the second circumferential steel bar unit, the hook bar, and the stirrup;

[0012] S12. Decompose the first circumferential steel bar unit and the second circumferential steel bar unit into the smallest units respectively. The first circumferential steel bar unit is decomposed into the first connecting piece, the second connecting piece, and the third connecting piece, and the second circumferential steel bar unit is decomposed into the fourth connecting piece and the fifth connecting piece.

[0013] In the preferred solution, the first circumferential steel bar unit and the second circumferential steel bar unit are symmetrically cut according to the symmetry center line respectively, reducing the types of semi-finished products.

[0014] In the preferred solution, the first circumferential steel bar unit and the second circumferential steel bar unit are manufactured in the order from bottom to top and from outside to inside, and the corresponding components of the first circumferential steel bar unit and the second circumferential steel bar unit are placed on the jig in sequence and fixed by lap welding.

[0015] In the preferred solution, in S2, after the first circumferential steel bar unit and the second circumferential steel bar unit are placed on the jig according to the design drawing, the corresponding hook bars are placed in the order from bottom to top. The two ends of the hook bar are respectively fixed by lap welding with the stirrup, and the first circumferential steel bar unit and the second circumferential steel bar unit are connected to form a mesh.

[0016] In the preferred solution, in S3, the mesh at the outermost side of the installation frame is fixed and used as a reference, and the remaining meshes are gradually placed to ensure the accurate position between different meshes.

[0017] In the preferred solution, there is a track arranged on the upper part of the installation frame, and a deviation correction unit is installed on the track. After the outermost mesh is fixed, the deviation correction unit includes two cameras arranged oppositely. The images of the mesh are collected axially from the main longitudinal reinforcement through the cameras, and the position of the mesh is compared with the design position, and the non-conforming mesh is adjusted and corrected.

[0018] In the preferred solution, before adjusting the meshes except the outermost one, obtain the distance between every two meshes according to the design drawing, and then adjust the corresponding single-step moving distance of the deviation correction unit. The single-step distance is equal to the designed distance between two meshes;

[0019] An intelligent storage and computing module is set inside the rectification unit. Two infrared light band emitters are arranged in the middle of the outer side of the rectification unit. Cameras are symmetrically arranged on both sides of the infrared light band emitters. First, turn on the cameras and the infrared light band emitters to obtain the imaging of the state of the light band irradiated on the outermost mesh and the positional relationship between the mesh and the longitudinal main reinforcement. At this time, the cameras capture and store the images and perform internal operations. Take the operation result R1 at this time as the benchmark. When the rectification unit moves to the placement position of the next mesh, turn on the infrared light band emitter. The infrared light band emitter irradiates the light band on the upper surface of the mesh. At this time, the cameras capture the imaging position of the light band on the mesh, and compare the calculation result R2 at this time with R1, so as to guide the staff to perform rectification.

[0020] In the preferred solution, the width of the light band is smaller than the diameter of the steel bars of the mesh. During internal operations, the two cameras respectively capture the feature points of the light band from both sides of the mesh for identification, obtain the positions of the contour vertices, convert them into coordinates and store them, and then compare and judge with the edge contour lines at the same height on both sides of the mesh.

[0021] In the preferred solution, when the rectification unit moves to the next mesh, the display screen displays the single-step distance, reminding the staff to confirm the accuracy of the moving position. Then, adjust and rectify through the cameras and the infrared light band emitters. At this time, the display screen conducts direction guidance and result display during the rectification process.

[0022] The beneficial effects of the present invention are as follows: The present invention divides the overall steel bar structure of the precast box girder into a structure form of steel bar mesh plus longitudinal main reinforcement. First, make the plane steel bar mesh according to the cross-section, and then connect the plane steel bar meshes into a whole by vertically inserting the longitudinal main reinforcement, so as to form the steel bar component structure of the precast box girder. Adopt the process of forming the cross-section mesh by inserting the main reinforcement. The disassembly process of the steel bar components is simple, the number of decomposed units is small, it is easy to quickly assemble and form, and it also ensures the overall stiffness during the production process of the precast box girder steel bar components, preventing the deformation of each sub-structure during the production process and the hoisting and transfer process, which is beneficial to the overall forming quality control. The standardized structure of the precast box girder cross-section also determines that the structure, size and shape of the plane steel bar mesh are consistent, which is beneficial to the process of standardizing the production and forming of steel bar components. It greatly reduces the number of operators, reduces the labor intensity of the personnel, greatly improves the production efficiency of the precast box girder steel bar components, and also greatly reduces the construction risk degree such as personnel gathering during the production process of the steel bar components. The production process flow of the steel bar components of the present invention is simple, the plane mesh and the longitudinal main reinforcement are all of the same size and shape, which is beneficial to standardizing the production and forming, ensuring the overall forming quality control of the steel bar components, and has very wide promotion value. Description of the Drawings

[0023] The following further describes the present invention in conjunction with the drawings and embodiments:

[0024] Figure 1It is a schematic diagram of the semi-finished product of the mesh reinforcement of the present invention;

[0025] Figure 2 It is a schematic diagram of the first step of the mesh forming of the present invention;

[0026] Figure 3 It is a schematic diagram of the second step of the mesh forming of the present invention;

[0027] Figure 4 It is a schematic diagram of the third step of the mesh forming of the present invention;

[0028] Figure 5 It is a schematic diagram of the fourth step of the mesh forming of the present invention;

[0029] Figure 6 It is a schematic diagram of the fifth step of the mesh forming of the present invention;

[0030] Figure 7 It is a schematic diagram of the sixth step of the mesh forming of the present invention;

[0031] Figure 8 It is a schematic diagram of the seventh step of the mesh forming of the present invention;

[0032] Figure 9 It is a schematic diagram of the connection between the mesh and the longitudinal main reinforcement of the present invention;

[0033] Figure 10 It is Figure 9 the right view schematic diagram of;

[0034] Figure 11 It is a schematic diagram of the welding of the mesh on the jig of the present invention;

[0035] Figure 12 It is Figure 9 the schematic diagram of connection and fixation on the mounting rack;

[0036] Figure 13 It is Figure 12 the top view schematic diagram of;

[0037] Figure 14 It is Figure 12 the front view schematic diagram of;

[0038] Figure 15 It is Figure 12 the left view schematic diagram of.

[0039] In the figure: the first circumferential reinforcement unit 1; the first connecting piece 101; the second connecting piece 102; the third connecting piece 103; the second circumferential reinforcement unit 2; the fourth connecting piece 201; the fifth connecting piece 202; the hook bar 3; the stirrup 4; the mesh 5; the longitudinal main reinforcement 6; the jig 7; the mounting rack 8; the track 9; the deviation rectifying unit 10; the camera 1001; the infrared light band emitter 1002; the display screen 1003. Specific embodiments

[0040] As Figures 1 - 15 in, a manufacturing method for the steel bar component of a precast box girder with a large cross-section includes the following steps:

[0041] S1. Fabricate the first circumferential steel bar unit 1 and the second circumferential steel bar unit 2 according to the design dimensions;

[0042] S2. Connect the first circumferential steel bar unit 1 and the second circumferential steel bar unit 2 according to the design pattern to form a mesh 5;

[0043] S3. Place multiple meshes 5 for splicing and assembly to form an integral component;

[0044] S4. Position the integral component in place, insert the longitudinal main steel bars 6 into the integral component until they pass through, and fix the mesh 5 with stirrups 4.

[0045] Decompose the steel bar component of the box girder into a combination of longitudinal main steel bars + planar stirrup meshes. Fabricate semi-finished longitudinal main steel bars and semi-finished mesh steel bars according to the design requirements. Place the semi-finished products on a special jig, and fabricate the planar stirrup mesh through binding and welding processes. Then, place a group of planar meshes vertically and parallelly according to the design requirements, directly insert the longitudinal main steel bars perpendicularly to the meshes at the required positions. After the insertion is in place, press the main steel bars tightly against the stirrups of the mesh and fix them by spot welding. Realize the fabrication of the steel bar component of the precast box girder, thereby improving the overall fabrication efficiency and ensuring the overall quality stability.

[0046] In a preferred solution, before S1, divide the internal structure of the steel box girder component along the direction of the longitudinal main steel bars 6. The dividing steps are as follows:

[0047] S11. Analyze the dimensions, characteristics of the steel bar composition of the steel box girder cross-section, and the feasibility of steel bar bending for regional division, which is divided into the first circumferential steel bar unit 1, the second circumferential steel bar unit 2, the hook bar 3, and the stirrup 4;

[0048] S12. Decompose the first circumferential steel bar unit 1 and the second circumferential steel bar unit 2 into the smallest units respectively. The first circumferential steel bar unit 1 is decomposed into the first connector 101, the second connector 102, and the third connector 103, and the second circumferential steel bar unit 2 is decomposed into the fourth connector 201 and the fifth connector 202.

[0049] The dividing form of the steel bar mesh takes the cross-section of the precast box girder as the benchmark, and the overall cross-section of the box girder is used as the division of the mesh. That is, the horizontal stirrups of the precast box girder and the hook bars in the plane where they are located jointly form a plane section as the steel bar mesh. Each layer of horizontal stirrups corresponds to a group of steel bar meshes. The overall plane steel bar mesh is formed by connecting horizontal stirrups of different shapes to form the cross-sectional shape of the box girder. The stirrups are arranged in a lap joint with the hook bars at a certain spacing according to the design requirements, and the two ends of the hook bars are welded and fixed to the lapped horizontal stirrups by lap welding to shape and strengthen the hook bars of the plane mesh.

[0050] In this process, it is necessary to focus on analyzing the dimensions and characteristics of the steel bars forming the cross-section of the precast box girder, and according to the feasibility characteristics of the bending and forming of the steel bars, the stirrups of the plane mesh are decomposed into multiple semi-finished steel bar products. There are a total of 6 types of stirrup semi-finished products, which are symmetrical on the left and right sides. The types of hook bars are relatively more. The hook bars can be divided into bottom plate hook bars, web hook bars, diaphragm hook bars, top plate hook bars and hook bars in the cross-common area at each position, so as to ensure the convenience and high economy of subsequent production.

[0051] In the preferred solution, the first circumferential steel bar unit 1 and the second circumferential steel bar unit 2 are respectively symmetrically cut according to the symmetry center line to reduce the types of semi-finished products. With this structure, the cutting efficiency can be improved, the types and complexity of semi-finished products can be reduced, and at the same time, the interchangeability between different meshes can be greatly improved.

[0052] In the preferred solution, the first circumferential steel bar unit 1 and the second circumferential steel bar unit 2 are manufactured in the order from bottom to top and from outside to inside, and the corresponding components of the first circumferential steel bar unit 1 and the second circumferential steel bar unit 2 are respectively placed on the jig 7 in an orderly manner and fixed by lap welding. With this structure, the inside and outside are independent of each other, ensuring relatively convenient construction, more reasonable overall production, and better process rhythm.

[0053] In the preferred solution, in S2, after the first circumferential steel bar unit 1 and the second circumferential steel bar unit 2 are placed on the jig 7 according to the design drawings, the corresponding hook bars 3 are placed in the order from bottom to top, and the two ends of the hook bars 3 are respectively lap welded and fixed to the stirrups 4, and the first circumferential steel bar unit 1 and the second circumferential steel bar unit 2 are connected to form a mesh 5. With this structure, it is convenient to adjust on the jig 7, avoiding the problem of out-of-tolerance dimensions during production and resulting in unqualified products.

[0054] In the preferred solution, in S3, the mesh 5 on the outermost side of the installation frame 8 is fixed and used as a benchmark, and the remaining meshes 5 are gradually placed to ensure the accurate position between different meshes 5. With this structure, the overall accuracy can be controlled and the adjustment is more convenient.

[0055] In a preferred solution, a track 9 is provided on the upper part of the mounting bracket 8, and a deviation rectifying unit 10 is installed on the track 9. After the outermost mesh sheet 5 is fixed, the deviation rectifying unit 10 includes two cameras 1001 arranged opposite to each other. The cameras 1001 collect images of the mesh sheet 5 along the axial direction of the longitudinal main reinforcement 6, compare the position of the mesh sheet 5 with the designed position, and adjust and rectify the non-conforming mesh sheet 5. In actual use, the track 9 is a rack, and a gear and a motor (not shown in the drawings) are correspondingly provided on the deviation rectifying unit 10. The motor drives the gear to rotate outside the track 9, and the gear meshes with the rack to drive the deviation rectifying unit 10 to adjust its own position. The overall material of the gear and rack is convenient to obtain, and at the same time, the accuracy meets the usage requirements, the usage cost is low, the installation and maintenance are more convenient, it can also adapt to a relatively complex environment, respond quickly, and the external environment has less disturbance to its working stability. The cameras 1001 obtain the position of the initial mesh sheet 5 by taking pictures, convert it into coordinate points for calculation, and perform fitting of the external contour line, so as to make an accurate comparison, providing a basis for adjusting the position and state of the subsequent mesh sheet 5.

[0056] In a preferred solution, before adjusting the mesh sheets 5 except the outermost one, the distance between every two mesh sheets 5 is obtained according to the design drawing, and then the corresponding single-step moving distance of the deviation rectifying unit 10 is adjusted. The single-step distance is equal to the designed distance between the two mesh sheets 5;

[0057] An intelligent storage and computing module is provided inside the deviation correction unit 10. Two infrared light band emitters 1002 are provided in the middle of the outer side of the deviation correction unit 10. Cameras 1001 are symmetrically arranged on both sides of the infrared light band emitters 1002. First, turn on the cameras 1001 and the infrared light band emitters 1002 to obtain the imaging of the state of the light band irradiated on the outermost mesh 5 and the positional relationship between the mesh 5 and the longitudinal main reinforcement 6. At this time, the cameras 1001 capture and store the images and perform internal operations, and take the operation result R1 at this time as the benchmark. When the deviation correction unit 10 moves to the placement position of the next mesh 5, turn on the infrared light band emitter 1002. The infrared light band emitter 1002 irradiates the light band on the upper surface of the mesh 5. At this time, the cameras 1001 capture the imaging position of the light band on the mesh 5, and compare the calculation result R2 at this time with R1, so as to guide the staff to perform deviation correction. A slope is provided on one side of the deviation correction unit 10 close to the mesh 5 to facilitate the stable operation of the cameras 1001 and the infrared light band emitters 1002. The two infrared light band emitters 1002 are vertically arranged, and at the same time, there is a misalignment distance of one steel bar diameter along the direction of the track 9 between the two infrared light band emitters 1002. With this structure, the infrared light band can directly irradiate the correct position where the mesh 5 should be originally set. When and only when the infrared light band is blocked by the mesh 5, the cameras 1001 can obtain the data of the matching between the infrared light band and the mesh 5, and at the same time can independently analyze whether the placement of the mesh is deflected. Since the cameras 1001 are provided on both sides, it can avoid deformation or blind area errors caused by incomplete image acquisition. Pitch angle adjustments are provided on the two infrared light band emitters 1002 respectively. For the convenience of operation, it is carried out in the way of screw and thread cooperation. The screw is fixed on the infrared light band emitter 1002 and can be adjusted within a certain angle range. The upper infrared light band emitter 1002 pitches upward to ensure that the infrared light band can irradiate the far end side of the mesh 5 away from the deviation correction unit 10, and the lower infrared light band emitter 1002 pitches downward to ensure that the infrared light band can irradiate the near end side of the mesh 5 close to the deviation correction unit 10. The two infrared light bands form irradiation areas on both sides of the mesh. Since the positions of the infrared light bands themselves are accurate, they can cooperate with each other to ensure that the mesh 5 is completely perpendicular to the main reinforcement 6, and avoid the problem that the overall mesh of the steel bar supplement is inconsistent due to the deflection of the mesh 5.

[0058] In a preferred solution, the width of the light band is smaller than the diameter of the steel bar of the mesh 5. During internal operations, the two cameras 1001 respectively capture the light band feature points from both sides of the mesh 5 for recognition, convert the obtained contour vertex positions into coordinates and store them, and then compare and judge with the edge contour lines at the same height on both sides of the mesh 5. With this structure, the overall calculation amount can be reduced, the operation speed is fast, the effect is better, and timely adjustment can be made immediately according to the imaging effect. At the same time, the two infrared light bands can monitor the steel bar states of their respective positions with each other, and the efficiency is higher.

[0059] In the preferred solution, when the deviation correction unit 10 moves to the next mesh 5, the display screen 1003 displays the single-step distance to remind the staff to confirm the accuracy of the moving position, and then adjust the deviation correction through the camera 1001 and the infrared light band transmitter 1002. At this time, the display screen 1003 guides the direction of the deviation correction process and displays the results. With this structure, the display screen can have multiple states and results. When it is found that the position of the mesh 5 is inaccurate, the result shows a cross to remind the staff to make adjustments, and then guide the adjustment direction in the form of a direction arrow. When the mesh 5 is adjusted to the right position, the result shows a hook, and then it is bound to the main reinforcement 6. After the binding is completed, the next mesh 5 is adjusted, until the adjustment, deviation correction and installation of all meshes 5 are completed.

[0060] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A manufacturing method for the steel bar component of a precast box girder with a large cross-section, characterized in that: It includes the following steps: S1. Fabricate the first circumferential steel bar unit (1) and the second circumferential steel bar unit (2) according to the design dimensions; S2. Connect the first circumferential steel bar unit (1) and the second circumferential steel bar unit (2) in accordance with the design pattern to form a mesh sheet (5); S3. Place multiple mesh sheets (5) for splicing and assembly to form an integral component; S4. Position the integral component, and insert the longitudinal main steel bars (6) into the integral component until they pass through, and fix the mesh sheet (5) with stirrups (4); Before S1, divide the internal structure of the box girder steel bar component longitudinally along the direction of the longitudinal main steel bars (6). The dividing steps are as follows: S11. Analyze the dimensions, characteristics of the steel bar composition of the steel box girder section, and the feasibility of steel bar bending for area division, which are divided into the first circumferential steel bar unit (1), the second circumferential steel bar unit (2), hook bars (3), and stirrups (4); S12. Decompose the first circumferential steel bar unit (1) and the second circumferential steel bar unit (2) into the smallest units respectively. The first circumferential steel bar unit (1) is decomposed into a first connecting piece (101), a second connecting piece (102), and a third connecting piece (103), and the second circumferential steel bar unit (2) is decomposed into a fourth connecting piece (201) and a fifth connecting piece (202).

2. The method for manufacturing the large cross-section precast box girder steel bar component according to claim 1, characterized in that: Symmetrically cut the first circumferential steel bar unit (1) and the second circumferential steel bar unit (2) respectively according to the symmetry center line to reduce the types of semi-finished products.

3. The manufacturing method of a large cross-section precast box girder steel component according to claim 1, characterized in that: Fabricate the first circumferential steel bar unit (1) and the second circumferential steel bar unit (2) in the order from bottom to top and from outside to inside, and orderly place the corresponding components of the first circumferential steel bar unit (1) and the second circumferential steel bar unit (2) on the jig (7) and fix them by lap welding.

4. The manufacturing method of a large-section precast box girder steel bar component according to claim 1, characterized in that: in S2, after placing the first circumferential steel bar unit (1) and the second circumferential steel bar unit (2) on the jig (7) according to the design drawings, place the corresponding hook bars (3) in the order from bottom to top. The two ends of the hook bars (3) are respectively lap welded and fixed with stirrups (4), and the first circumferential steel bar unit (1) and the second circumferential steel bar unit (2) are connected to form a mesh sheet (5).

5. The manufacturing method of a large-section precast box girder steel bar component according to claim 1, characterized in that: in S3, fix the mesh sheet (5) on the outermost side of the installation frame (8) as a reference, and gradually place the remaining mesh sheets (5) to ensure the accurate position between different mesh sheets (5).

6. The manufacturing method of a large cross-section precast box girder steel component according to claim 5, characterized in that: at The upper part of the installation frame (8) is provided with a track (9), and a deviation correction unit (10) is installed on the track (9). After fixing the outermost mesh sheet (5), the deviation correction unit (10) includes two cameras (1001) arranged oppositely. Images of the mesh sheet (5) are collected axially from the longitudinal main steel bars (6) through the cameras (1001), the position of the mesh sheet (5) is compared with the design position, and the non-conforming mesh sheet (5) is adjusted and corrected.

7. The manufacturing method of a large-section precast box girder steel component according to claim 1, characterized in that: in Before adjusting the inner mesh sheets (5) except the outermost one, obtain the spacing between every two mesh sheets (5) according to the design drawing, and then adjust the single-step movement distance corresponding to the deviation rectifying unit (10). The single-step distance is equal to the designed spacing between two mesh sheets (5). An intelligent storage and calculation module is arranged in the deviation rectifying unit (10). Two infrared light strip emitters (1002) are arranged in the middle of the outer side of the deviation rectifying unit (10). Cameras (1001) are symmetrically arranged on both sides of the infrared light strip emitters (1002). First, turn on the cameras (1001) and the infrared light strip emitters (1002) to obtain the state of the light strip irradiated on the outermost mesh sheet (5) and the imaging of the positional relationship between the mesh sheet (5) and the longitudinal main reinforcement (6). At this time, the cameras (1001) capture and store the images and perform internal operations. Take the operation result R1 at this time as the reference. When the deviation rectifying unit (10) moves to the placement position of the next mesh sheet (5), turn on the infrared light strip emitters (1002). The infrared light strip emitters (1002) irradiate the light strip on the upper surface of the mesh sheet (5). At this time, the cameras (1001) capture the imaging position of the light strip on the mesh sheet (5), and compare the calculation result R2 at this time with R1, so as to guide the staff to perform deviation rectification.

8. The manufacturing method of a large cross-section precast box girder steel component according to claim 7, characterized in that: The width of the light strip is smaller than the diameter of the steel bars of the mesh sheet (5). During internal operations, the two cameras (1001) respectively capture the feature points of the light strip from both sides of the mesh sheet (5) for recognition, obtain the position of the contour vertices, convert them into coordinates and store them, and then compare and judge with the edge contour lines at the same height on both sides of the mesh sheet (5).

9. The manufacturing method of a large cross-section precast box girder steel component according to claim 7 is characterized in that: at When the deviation rectifying unit (10) moves to the next mesh sheet (5), the display screen (1003) displays the single-step distance to remind the staff to confirm the accuracy of the moving position. Then, adjust and rectify the deviation through the cameras (1001) and the infrared light strip emitters (1002). At this time, the display screen (1003) conducts direction guidance and result display during the deviation rectification process.

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